chore: Release

this should fix #140

.envrc

@@ -0,0 +1 @@
+use flake

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+github: [feschber]
+ko_fi: feschber

.github/workflows/cachix.yml

@@ -0,0 +1,40 @@
+name: Binary Cache
+
+on: [push, pull_request, workflow_dispatch]
+jobs:
+  nix:
+    strategy:
+      matrix:
+       os: 
+        - ubuntu-latest
+        - macos-13
+        - macos-14
+    name: "Build"
+    runs-on: ${{ matrix.os }} 
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - uses: DeterminateSystems/nix-installer-action@main
+      with:
+        logger: pretty
+    - uses: DeterminateSystems/magic-nix-cache-action@main
+    - uses: cachix/cachix-action@v14
+      with:
+        name: lan-mouse
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
+    - name: Build lan-mouse (x86_64-linux)
+      if: matrix.os == 'ubuntu-latest'
+      run: nix build --print-build-logs --show-trace .#packages.x86_64-linux.lan-mouse
+
+    - name: Build lan-mouse (x86_64-darwin)
+      if: matrix.os == 'macos-13'
+      run: nix build --print-build-logs --show-trace .#packages.x86_64-darwin.lan-mouse
+
+    - name: Build lan-mouse (aarch64-darwin)
+      if: matrix.os == 'macos-14'
+      run: nix build --print-build-logs --show-trace .#packages.aarch64-darwin.lan-mouse
+

.github/workflows/pre-release.yml

@@ -13,15 +13,16 @@ jobs:
   linux-release-build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: install dependencies
       run: |
         sudo apt-get update
         sudo apt-get install libx11-dev libxtst-dev
+        sudo apt-get install libadwaita-1-dev libgtk-4-dev
     - name: Release Build
       run: cargo build --release
     - name: Upload build artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: lan-mouse-linux
         path: target/release/lan-mouse
@@ -29,22 +30,92 @@ jobs:
   windows-release-build:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.11'
+    # needed for cache restore
+    - name: create gtk dir
+      run: mkdir C:\gtk-build\gtk\x64\release
+    - uses: actions/cache@v3
+      id: cache
+      with:
+        path: c:/gtk-build/gtk/x64/release/**
+        key: gtk-windows-build
+        restore-keys: gtk-windows-build
+    - name: Update path
+      run: |
+        echo "PKG_CONFIG=C:\gtk-build\gtk\x64\release\bin\pkgconf.exe" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+        echo "C:\pkg-config-lite-0.28-1\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        echo "C:\gtk-build\gtk\x64\release\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        echo $env:GITHUB_PATH
+        echo $env:PATH
+    - name: Install dependencies
+      if: steps.cache.outputs.cache-hit != 'true'
+      run: |
+        # choco install msys2
+        # choco install visualstudio2022-workload-vctools
+        # choco install pkgconfiglite
+        pipx install gvsbuild
+        # see https://github.com/wingtk/gvsbuild/pull/1004
+        Move-Item "C:\Program Files\Git\usr\bin" "C:\Program Files\Git\usr\notbin"
+        Move-Item "C:\Program Files\Git\bin" "C:\Program Files\Git\notbin"
+        gvsbuild build --msys-dir=C:\msys64 gtk4 libadwaita librsvg
+        Move-Item "C:\Program Files\Git\usr\notbin" "C:\Program Files\Git\usr\bin"
+        Move-Item "C:\Program Files\Git\notbin" "C:\Program Files\Git\bin"
+    - uses: actions/checkout@v4
     - name: Release Build
       run: cargo build --release
+    - name: Create Archive
+      run: |
+        mkdir "lan-mouse-windows"
+        Get-Childitem -Path "C:\\gtk-build\\gtk\\x64\\release\\bin\\*.dll" -File -Recurse | Copy-Item -Destination "lan-mouse-windows"
+        Copy-Item -Path "target\release\lan-mouse.exe" -Destination "lan-mouse-windows"
+        Compress-Archive -Path "lan-mouse-windows\*" -DestinationPath lan-mouse-windows.zip
     - name: Upload build artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: lan-mouse-windows
-        path: target/release/lan-mouse.exe
+        path: lan-mouse-windows.zip
+
+  macos-release-build:
+    runs-on: macos-13
+    steps:
+    - uses: actions/checkout@v4
+    - name: install dependencies
+      run: brew install gtk4 libadwaita
+    - name: Release Build
+      run: |
+        cargo build --release
+        cp target/release/lan-mouse lan-mouse-macos-intel
+    - name: Upload build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: lan-mouse-macos-intel
+        path: lan-mouse-macos-intel
+
+  macos-aarch64-release-build:
+    runs-on: macos-14
+    steps:
+    - uses: actions/checkout@v4
+    - name: install dependencies
+      run: brew install gtk4 libadwaita
+    - name: Release Build
+      run: |
+        cargo build --release
+        cp target/release/lan-mouse lan-mouse-macos-aarch64
+    - name: Upload build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: lan-mouse-macos-aarch64
+        path: lan-mouse-macos-aarch64
 
   pre-release:
     name: "Pre Release"
-    needs: [windows-release-build, linux-release-build]
+    needs: [windows-release-build, linux-release-build, macos-release-build]
     runs-on: "ubuntu-latest"
     steps:
     - name: Download build artifacts
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
     - name: Create Release
       uses: "marvinpinto/action-automatic-releases@latest"
       with:
@@ -54,4 +125,6 @@ jobs:
         title: "Development Build"
         files: |
           lan-mouse-linux/lan-mouse
-          lan-mouse-windows/lan-mouse.exe
+          lan-mouse-macos-intel/lan-mouse-macos-intel
+          lan-mouse-macos-aarch64/lan-mouse-macos-aarch64
+          lan-mouse-windows/lan-mouse-windows.zip

.github/workflows/rust.yml

@@ -15,17 +15,22 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: install dependencies
       run: |
         sudo apt-get update
         sudo apt-get install libx11-dev libxtst-dev
+        sudo apt-get install libadwaita-1-dev libgtk-4-dev
     - name: Build
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+    - name: Check Formatting
+      run: cargo fmt --check
+    - name: Clippy
+      run: cargo clippy --all-features --all-targets -- --deny warnings
     - name: Upload build artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: lan-mouse
         path: target/debug/lan-mouse
@@ -35,13 +40,93 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.11'
+    # needed for cache restore
+    - name: create gtk dir
+      run: mkdir C:\gtk-build\gtk\x64\release
+    - uses: actions/cache@v3
+      id: cache
+      with:
+        path: c:/gtk-build/gtk/x64/release/**
+        key: gtk-windows-build
+        restore-keys: gtk-windows-build
+    - name: Update path
+      run: |
+        echo "PKG_CONFIG=C:\gtk-build\gtk\x64\release\bin\pkgconf.exe" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+        echo "C:\pkg-config-lite-0.28-1\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        echo "C:\gtk-build\gtk\x64\release\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        echo $env:GITHUB_PATH
+        echo $env:PATH
+    - name: Install dependencies
+      if: steps.cache.outputs.cache-hit != 'true'
+      run: |
+        # choco install msys2
+        # choco install visualstudio2022-workload-vctools
+        # choco install pkgconfiglite
+        pipx install gvsbuild
+        # see https://github.com/wingtk/gvsbuild/pull/1004
+        Move-Item "C:\Program Files\Git\usr\bin" "C:\Program Files\Git\usr\notbin"
+        Move-Item "C:\Program Files\Git\bin" "C:\Program Files\Git\notbin"
+        gvsbuild build --msys-dir=C:\msys64 gtk4 libadwaita librsvg
+        Move-Item "C:\Program Files\Git\usr\notbin" "C:\Program Files\Git\usr\bin"
+        Move-Item "C:\Program Files\Git\notbin" "C:\Program Files\Git\bin"
     - name: Build
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+    - name: Check Formatting
+      run: cargo fmt --check
+    - name: Clippy
+      run: cargo clippy --all-features --all-targets -- --deny warnings
+    - name: Copy Gtk Dlls
+      run: Get-Childitem -Path "C:\\gtk-build\\gtk\\x64\\release\\bin\\*.dll" -File -Recurse | Copy-Item -Destination "target\\debug"
     - name: Upload build artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: lan-mouse-windows
-        path: target/debug/lan-mouse.exe
+        path: |
+          target/debug/lan-mouse.exe
+          target/debug/*.dll
+
+  build-macos:
+    runs-on: macos-13
+    steps:
+    - uses: actions/checkout@v4
+    - name: install dependencies
+      run: brew install gtk4 libadwaita
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
+    - name: Check Formatting
+      run: cargo fmt --check
+    - name: Clippy
+      run: cargo clippy --all-features --all-targets -- --deny warnings
+    - name: Upload build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: lan-mouse-macos
+        path: target/debug/lan-mouse
+
+  build-macos-aarch64:
+    runs-on: macos-14
+    steps:
+    - uses: actions/checkout@v4
+    - name: install dependencies
+      run: brew install gtk4 libadwaita
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
+    - name: Check Formatting
+      run: cargo fmt --check
+    - name: Clippy
+      run: cargo clippy --all-features --all-targets -- --deny warnings
+    - name: Upload build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: lan-mouse-macos-aarch64
+        path: target/debug/lan-mouse

.github/workflows/tagged-release.yml

@@ -9,15 +9,16 @@ jobs:
   linux-release-build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: install dependencies
       run: |
         sudo apt-get update
         sudo apt-get install libx11-dev libxtst-dev
+        sudo apt-get install libadwaita-1-dev libgtk-4-dev
     - name: Release Build
       run: cargo build --release
     - name: Upload build artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: lan-mouse-linux
         path: target/release/lan-mouse
@@ -25,22 +26,92 @@ jobs:
   windows-release-build:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.11'
+    # needed for cache restore
+    - name: create gtk dir
+      run: mkdir C:\gtk-build\gtk\x64\release
+    - uses: actions/cache@v3
+      id: cache
+      with:
+        path: c:/gtk-build/gtk/x64/release/**
+        key: gtk-windows-build
+        restore-keys: gtk-windows-build
+    - name: Update path
+      run: |
+        echo "PKG_CONFIG=C:\gtk-build\gtk\x64\release\bin\pkgconf.exe" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+        echo "C:\pkg-config-lite-0.28-1\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        echo "C:\gtk-build\gtk\x64\release\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        echo $env:GITHUB_PATH
+        echo $env:PATH
+    - name: Install dependencies
+      if: steps.cache.outputs.cache-hit != 'true'
+      run: |
+        # choco install msys2
+        # choco install visualstudio2022-workload-vctools
+        # choco install pkgconfiglite
+        pipx install gvsbuild
+        # see https://github.com/wingtk/gvsbuild/pull/1004
+        Move-Item "C:\Program Files\Git\usr\bin" "C:\Program Files\Git\usr\notbin"
+        Move-Item "C:\Program Files\Git\bin" "C:\Program Files\Git\notbin"
+        gvsbuild build --msys-dir=C:\msys64 gtk4 libadwaita librsvg
+        Move-Item "C:\Program Files\Git\usr\notbin" "C:\Program Files\Git\usr\bin"
+        Move-Item "C:\Program Files\Git\notbin" "C:\Program Files\Git\bin"
+    - uses: actions/checkout@v4
     - name: Release Build
       run: cargo build --release
+    - name: Create Archive
+      run: |
+        mkdir "lan-mouse-windows"
+        Get-Childitem -Path "C:\\gtk-build\\gtk\\x64\\release\\bin\\*.dll" -File -Recurse | Copy-Item -Destination "lan-mouse-windows"
+        Copy-Item -Path "target\release\lan-mouse.exe" -Destination "lan-mouse-windows"
+        Compress-Archive -Path "lan-mouse-windows\*" -DestinationPath lan-mouse-windows.zip
     - name: Upload build artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: lan-mouse-windows
-        path: target/release/lan-mouse.exe
+        path: lan-mouse-windows.zip
+
+  macos-release-build:
+    runs-on: macos-13
+    steps:
+    - uses: actions/checkout@v4
+    - name: install dependencies
+      run: brew install gtk4 libadwaita
+    - name: Release Build
+      run: |
+        cargo build --release
+        cp target/release/lan-mouse lan-mouse-macos-intel
+    - name: Upload build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: lan-mouse-macos-intel
+        path: lan-mouse-macos-intel
+
+  macos-aarch64-release-build:
+    runs-on: macos-14
+    steps:
+    - uses: actions/checkout@v4
+    - name: install dependencies
+      run: brew install gtk4 libadwaita
+    - name: Release Build
+      run: |
+        cargo build --release
+        cp target/release/lan-mouse lan-mouse-macos-aarch64
+    - name: Upload build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: lan-mouse-macos-aarch64
+        path: lan-mouse-macos-aarch64
 
   tagged-release:
     name: "Tagged Release"
-    needs: [windows-release-build, linux-release-build]
+    needs: [windows-release-build, linux-release-build, macos-release-build]
     runs-on: "ubuntu-latest"
     steps:
     - name: Download build artifacts
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
     - name: "Create Release"
       uses: "marvinpinto/action-automatic-releases@latest"
       with:
@@ -48,4 +119,6 @@ jobs:
         prerelease: false
         files: |
           lan-mouse-linux/lan-mouse
-          lan-mouse-windows/lan-mouse.exe
+          lan-mouse-macos-intel/lan-mouse-macos-intel
+          lan-mouse-macos-aarch64/lan-mouse-macos-aarch64
+          lan-mouse-windows/lan-mouse-windows.zip

.gitignore

@@ -1 +1,7 @@
 /target
+.gdbinit
+.idea/
+.vs/
+.vscode/
+.direnv/
+result

Cargo.toml

@@ -1,48 +1,65 @@
+[workspace]
+members = ["input-capture", "input-emulation", "input-event"]
+
 [package]
 name = "lan-mouse"
 description = "Software KVM Switch / mouse & keyboard sharing software for Local Area Networks"
-version = "0.2.1"
+version = "0.8.0"
 edition = "2021"
 license = "GPL-3.0-or-later"
-repository = "https://github.com/ferdinandschober/lan-mouse"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+repository = "https://github.com/feschber/lan-mouse"
 
 [profile.release]
 strip = true
 lto = "fat"
 
 [dependencies]
-tempfile = "3.6"
-trust-dns-resolver = "0.22"
-memmap = "0.7"
-toml = "0.7"
+input-event = { path = "input-event", version = "0.2.1" }
+input-emulation = { path = "input-emulation", version = "0.1.0", default-features = false }
+input-capture = { path = "input-capture", version = "0.2.0", default-features = false }
+
+hickory-resolver = "0.24.1"
+toml = "0.8"
 serde = { version = "1.0", features = ["derive"] }
 anyhow = "1.0.71"
 log = "0.4.20"
-env_logger = "0.10.0"
-mio = { version = "0.8", features = ["os-ext"] }
-libc = "0.2.148"
+env_logger = "0.11.3"
 serde_json = "1.0.107"
+tokio = { version = "1.32.0", features = [
+    "io-util",
+    "io-std",
+    "macros",
+    "net",
+    "process",
+    "rt",
+    "sync",
+    "signal",
+] }
+futures = "0.3.28"
+clap = { version = "4.4.11", features = ["derive"] }
+gtk = { package = "gtk4", version = "0.9.0", features = [
+    "v4_2",
+], optional = true }
+adw = { package = "libadwaita", version = "0.7.0", features = [
+    "v1_1",
+], optional = true }
+async-channel = { version = "2.1.1", optional = true }
+hostname = "0.4.0"
+slab = "0.4.9"
+endi = "1.1.0"
+thiserror = "1.0.61"
+tokio-util = "0.7.11"
 
 [target.'cfg(unix)'.dependencies]
-wayland-client = { version="0.30.2", optional = true }
-wayland-protocols = { version="0.30.0", features=["client", "staging", "unstable"], optional = true }
-wayland-protocols-wlr = { version="0.1.0", features=["client"], optional = true }
-wayland-protocols-misc = { version="0.1.0", features=["client"], optional = true }
-wayland-protocols-plasma = { version="0.1.0", features=["client"], optional = true }
-mio-signals = "0.2.0"
-x11 = { version = "2.21.0", features = ["xlib", "xtest"], optional = true }
-gtk = { package = "gtk4", version = "0.7.2", features = ["v4_8"], optional = true }
-adw = { package = "libadwaita", version = "0.5.2", features = ["v1_3"], optional = true }
+libc = "0.2.148"
 
-[target.'cfg(windows)'.dependencies]
-winapi = { version = "0.3.9", features = ["winuser"] }
+[build-dependencies]
+glib-build-tools = { version = "0.20.0", optional = true }
 
 [features]
-default = ["wayland", "x11", "xdg_desktop_portal", "libei"]
-wayland = ["dep:wayland-client", "dep:wayland-protocols", "dep:wayland-protocols-wlr", "dep:wayland-protocols-misc", "dep:wayland-protocols-plasma"]
-x11 = ["dep:x11"]
-xdg_desktop_portal = []
-libei = []
-gtk = ["dep:gtk", "dep:adw"]
+default = ["wayland", "x11", "xdg_desktop_portal", "libei", "gtk"]
+wayland = ["input-capture/wayland", "input-emulation/wayland"]
+x11 = ["input-capture/x11", "input-emulation/x11"]
+xdg_desktop_portal = ["input-emulation/xdg_desktop_portal"]
+libei = ["input-event/libei", "input-capture/libei", "input-emulation/libei"]
+gtk = ["dep:gtk", "dep:adw", "dep:async-channel", "dep:glib-build-tools"]

README.md

@@ -1,164 +1,339 @@
-# Lan Mouse Share
-Goal of this project is to be an open-source replacement for proprietary tools like [Synergy](https://symless.com/synergy), [Share Mouse](https://www.sharemouse.com/de/).
+# Lan Mouse
+Lan Mouse is a mouse and keyboard sharing software similar to universal-control on Apple devices.
+It allows for using multiple pcs with a single set of mouse and keyboard.
+This is also known as a Software KVM switch.
+
+The primary target is Wayland on Linux but Windows and MacOS and Linux on Xorg have partial support as well (see below for more details).
+
+- _Now with a gtk frontend_
+
+<picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://github.com/feschber/lan-mouse/assets/40996949/016a06a9-76db-4951-9dcc-127d012c59df">
+    <source media="(prefers-color-scheme: light)" srcset="https://github.com/feschber/lan-mouse/assets/40996949/d6318340-f811-4e16-9d6e-d1b79883c709">
+    <img alt="Screenshot of Lan-Mouse" srcset="https://github.com/feschber/lan-mouse/assets/40996949/016a06a9-76db-4951-9dcc-127d012c59df">
+</picture>
+
+
+Goal of this project is to be an open-source replacement for proprietary tools like [Synergy 2/3](https://symless.com/synergy), [Share Mouse](https://www.sharemouse.com/de/).
 
 Focus lies on performance and a clean, manageable implementation that can easily be expanded to support additional backends like e.g. Android, iOS, ... .
 
-Of course ***blazingly fast™*** and stable, because it's written in rust.
+***blazingly fast™*** because it's written in rust.
 
 For an alternative (with slightly different goals) you may check out [Input Leap](https://github.com/input-leap).
 
-## Configuration
-Configuration is done through the file `config.toml`,
-which must be located in the current working directory when
-executing lan-mouse.
 
-### Example config
-A minimal config file could look like this:
+> [!WARNING]
+> Since this tool has gained a bit of popularity over the past couple of days:
+>
+> All network traffic is currently **unencrypted** and sent in **plaintext**.
+>
+> A malicious actor with access to the network could read input data or send input events with spoofed IPs to take control over a device.
+>
+> Therefore you should only use this tool in your local network with trusted devices for now
+> and I take no responsibility for any leakage of data!
 
-```toml
-[left]
-host_name = "my-laptop"
+
+## OS Support
+
+The following table shows support for input emulation (to emulate events received from other clients) and
+input capture (to send events *to* other clients) on different operating systems:
+
+| OS / Desktop Environment  | input emulation          | input capture                        |
+|---------------------------|--------------------------|--------------------------------------|
+| Wayland (wlroots)         | :heavy_check_mark:       | :heavy_check_mark:                   |
+| Wayland (KDE)             | :heavy_check_mark:       | :heavy_check_mark:                   |
+| Wayland (Gnome)           | :heavy_check_mark:       | :heavy_check_mark: (starting at GNOME 45) |
+| Windows                   | :heavy_check_mark:       | :heavy_check_mark:                   |
+| X11                       | :heavy_check_mark:       | WIP                                  |
+| MacOS                     | :heavy_check_mark:       | WIP                                  |
+
+> [!Important]
+> Gnome -> Sway only partially works (modifier events are not handled correctly)
+
+> [!Important]
+> **Wayfire**
+>
+> If you are using [Wayfire](https://github.com/WayfireWM/wayfire), make sure to use a recent version (must be newer than October 23rd) and **add `shortcuts-inhibit` to the list of plugins in your wayfire config!**
+> Otherwise input capture will not work.
+
+> [!Important]
+> The mouse cursor will be invisible when sending input to a Windows system if
+> there is no real mouse connected to the machine.
+
+## Installation
+### Install via cargo
+```sh
+cargo install lan-mouse
 ```
 
-Where `left` can be either `left`, `right`, `top` or `bottom`.
+### Download from Releases
+Precompiled release binaries for Windows, MacOS and Linux are available in the [releases section](https://github.com/feschber/lan-mouse/releases).
+
+For Windows, the depenedencies are included in the .zip file, for other operating systems see [Installing Dependencies](#installing-dependencies).
+
+### Arch Linux
+
+Lan Mouse can be installed from the [official repositories](https://archlinux.org/packages/extra/x86_64/lan-mouse/):
+
+```sh
+pacman -S lan-mouse
+```
+
+It is also available on the AUR:
+
+```sh
+# git version (includes latest changes)
+paru -S lan-mouse-git
+
+# alternatively
+paru -S lan-mouse-bin
+```
+
+### Nix
+- nixpkgs: [search.nixos.org](https://search.nixos.org/packages?channel=unstable&show=lan-mouse&from=0&size=50&sort=relevance&type=packages&query=lan-mouse)
+- flake: [README.md](./nix/README.md)
 
 
-### Additional options
-Additionally
-- a preferred backend
-- a port override for the default port (4242)
+### Manual Installation
 
-can be specified.
+First make sure to [install the necessary dependencies](#installing-dependencies).
 
-Supported backends currently include "wlroots", "x11" and "windows".
-
-These two options can also be specified via the commandline
-options `--backend` and `--port` respectively.
-
-## Build and Run
-Build only
+Build in release mode:
 ```sh
 cargo build --release
 ```
 
-Run
+Run directly:
 ```sh
 cargo run --release
 ```
 
+Install the files:
+```sh
+# install lan-mouse
+sudo cp target/release/lan-mouse /usr/local/bin/
+
+# install app icon
+sudo mkdir -p /usr/local/share/icons/hicolor/scalable/apps
+sudo cp resources/de.feschber.LanMouse.svg /usr/local/share/icons/hicolor/scalable/apps
+
+# update icon cache
+gtk-update-icon-cache /usr/local/share/icons/hicolor/
+
+# install desktop entry
+sudo mkdir -p /usr/local/share/applications
+sudo cp de.feschber.LanMouse.desktop /usr/local/share/applications
+
+# when using firewalld: install firewall rule
+sudo cp firewall/lan-mouse.xml /etc/firewalld/services
+# -> enable the service in firewalld settings
+```
+
 ### Conditional Compilation
 
-Currently only x11, wayland and windows are supported backends,
+Currently only x11, wayland, windows and MacOS are supported backends.
 Depending on the toolchain used, support for other platforms is omitted
 automatically (it does not make sense to build a Windows `.exe` with
 support for x11 and wayland backends).
 
-However one might still want to omit support for e.g. wayland or x11 on
+However one might still want to omit support for e.g. wayland, x11 or libei on
 a Linux system.
 
 This is possible through
-[cargo features](https://doc.rust-lang.org/cargo/reference/features.html)
+[cargo features](https://doc.rust-lang.org/cargo/reference/features.html).
 
 E.g. if only wayland support is needed, the following command produces
 an executable with just support for wayland:
 ```sh
 cargo build --no-default-features --features wayland
 ```
-
-## OS Support
-
-The following table shows support for Event receiving and event Emitting
-on different operating systems:
-
-| Backend                   | Event Receiving          | Event Emitting                       |
-|---------------------------|--------------------------|--------------------------------------|
-| Wayland (wlroots)         | :heavy_check_mark:       | :heavy_check_mark:                   |
-| Wayland (KDE)             | WIP                      | :heavy_check_mark:                   |
-| Wayland (Gnome)           | TODO (libei support)     | TODO (wlr-layer-shell not supported) |
-| X11                       | WIP                      | TODO                                 |
-| Windows                   | needs improvements       | TODO                                 |
-| MacOS                     | TODO (I dont own a Mac)  | TODO (I dont own a Mac)              |
-
-## Wayland compositor support
-### Input Emulation (for receiving events)
-On wayland input-emulation is in an early/unstable state as of writing this.
-
-Different compositors have different ways of enabling input emulation:
-
-Most wlroots-based compositors like Hyprland and Sway support the following
-unstable wayland protocols for keyboard and mouse emulation:
-- [virtual-keyboard-unstable-v1](https://wayland.app/protocols/virtual-keyboard-unstable-v1)
-- [wlr-virtual-pointer-unstable-v1](https://wayland.app/protocols/wlr-virtual-pointer-unstable-v1) are used to emulate input on wlroots compositors
-
-KDE also has a protocol for input emulation ([kde-fake-input](https://wayland.app/protocols/kde-fake-input)), it is however not exposed to
-third party apps, so the recommended way of enabling input emulation in KDE is the
-[freedesktop remote-desktop-portal](https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.RemoteDesktop).
-
-Gnome uses [libei](https://gitlab.freedesktop.org/libinput/libei) for input emulation,
-which has the goal to become the general approach for emulating Input on wayland.
-
-|  Required Protocols  (Event Receiving) | Sway               | Kwin                 | Gnome                |
-|----------------------------------------|--------------------|----------------------|----------------------|
-| wlr-virtual-pointer-unstable-v1        | :heavy_check_mark: | :x:                  | :x:                  |
-| virtual-keyboard-unstable-v1           | :heavy_check_mark: | :x:                  | :x:                  |
-| ~fake-input~                           | :x:                | ~:heavy_check_mark:~ | :x:                  |
-
-### Input capture
-
-To capture mouse and keyboard input, a few things are necessary:
-- Displaying an immovable surface at screen edges
-- Locking the mouse in place
-- (optionally but highly recommended) reading unaccelerated mouse input
-
-|  Required Protocols  (Event Emitting)  | Sway               | Kwin                 | Gnome                |
-|----------------------------------------|--------------------|----------------------|----------------------|
-| pointer-constraints-unstable-v1        | :heavy_check_mark: | :heavy_check_mark:   | :heavy_check_mark:   |
-| relative-pointer-unstable-v1           | :heavy_check_mark: | :heavy_check_mark:   | :heavy_check_mark:   |
-| keyboard-shortcuts-inhibit-unstable-v1 | :heavy_check_mark: | :heavy_check_mark:   | :heavy_check_mark:   |
-| wlr-layer-shell-unstable-v1            | :heavy_check_mark: | :heavy_check_mark:   | :x:                  |
-
-The [zwlr\_virtual\_pointer\_manager\_v1](wlr-virtual-pointer-unstable-v1) is required
-to display surfaces on screen edges and used to display the immovable window on
-both wlroots based compositors and KDE.
-
-Gnome unfortunately does not support this protocol
-and [likely won't ever support it](https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/1141).
-
-So there is currently no way of doing this in Wayland, aside from a custom Gnome-Shell
-extension, which is not a very elegant solution.
-
-This is to be looked into in the future.
-
-~In order for layershell surfaces to be able to lock the pointer using the pointer\_constraints protocol [this patch](https://github.com/swaywm/sway/pull/7178) needs to be applied to sway.~
-(this works natively on sway versions >= 1.8)
-
-## Windows support
-Currently windows can receive mouse and keyboard events, however unlike
-with the wlroots back-end,
-
-the scancodes are not translated between keyboard layouts.
-
-Event emitting is WIP.
+For a detailed list of available features, checkout the [Cargo.toml](./Cargo.toml)
 
 
-## TODOS
-- [x] Capture the actual mouse events on the server side via a wayland client and send them to the client
-- [x] Mouse grabbing
-- [x] Window with absolute position -> wlr\_layer\_shell
-- [x] DNS resolving
-- [x] Keyboard support
-- [x] Scrollwheel support
-- [x] Button support
-- [ ] Latency measurement + logging
-- [ ] Bandwidth usage approximation + logging
-- [ ] Multiple IP addresses -> check which one is reachable
-- [x] Merge server and client -> Both client and server can send and receive events depending on what mouse is used where
-- [ ] Liveness tracking (automatically ungrab mouse when client unreachable)
+## Installing Dependencies
+<details>
+    <summary>MacOS</summary>
+
+```sh
+brew install libadwaita
+```
+</details>
+
+<details>
+    <summary>Ubuntu and derivatives</summary>
+
+```sh
+sudo apt install libadwaita-1-dev libgtk-4-dev libx11-dev libxtst-dev
+```
+</details>
+
+<details>
+    <summary>Arch and derivatives</summary>
+
+```sh
+sudo pacman -S libadwaita gtk libx11 libxtst
+```
+</details>
+
+<details>
+    <summary>Fedora and derivatives</summary>
+
+```sh
+sudo dnf install libadwaita-devel libXtst-devel libX11-devel
+```
+</details>
+<details>
+    <summary>Windows</summary>
+
+> [!NOTE]
+> This is only necessary when building lan-mouse from source. The windows release comes with precompiled gtk dlls.
+
+- First install [Rust](https://www.rust-lang.org/tools/install).
+
+- Then follow the instructions at [gtk-rs.org](https://gtk-rs.org/gtk4-rs/stable/latest/book/installation_windows.html)
+
+*TLDR:*
+
+Build gtk from source
+
+- The following commands should be run in an **admin power shell** instance:
+```sh
+# install chocolatey
+Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
+
+# install gvsbuild dependencies
+choco install python git msys2 visualstudio2022-workload-vctools
+```
+
+- The following commands should be run in a **regular power shell** instance:
+
+```sh
+# install gvsbuild with python
+python -m pip install --user pipx
+python -m pipx ensurepath
+```
+
+- Relaunch your powershell instance so the changes in the environment are reflected.
+```sh
+pipx install gvsbuild
+
+# build gtk + libadwaita
+gvsbuild build gtk4 libadwaita librsvg
+```
+
+- **Make sure to add the directory** `C:\gtk-build\gtk\x64\release\bin`
+[**to the `PATH` environment variable**]((https://learn.microsoft.com/en-us/previous-versions/office/developer/sharepoint-2010/ee537574(v=office.14))). Otherwise the project will fail to build.
+
+To avoid building GTK from source, it is possible to disable
+the gtk frontend (see conditional compilation below).
+</details>
+
+## Usage
+### Gtk Frontend
+By default the gtk frontend will open when running `lan-mouse`.
+
+To add a new connection, simply click the `Add` button on *both* devices,
+enter the corresponding hostname and activate it.
+
+If the mouse can not be moved onto a device, make sure you have port `4242` (or the one selected)
+opened up in your firewall.
+
+### Command Line Interface
+The cli interface can be enabled using `--frontend cli` as commandline arguments.
+Type `help` to list the available commands.
+
+E.g.:
+```sh
+$ cargo run --release -- --frontend cli
+(...)
+> connect <host> left|right|top|bottom
+(...)
+> list
+(...)
+> activate 0
+```
+
+### Daemon
+Lan Mouse can be launched in daemon mode to keep it running in the background.
+To do so, add `--daemon` to the commandline args:
+
+```sh
+$ cargo run --release -- --daemon
+```
+
+In order to start lan-mouse with a graphical session automatically,
+the [systemd-service](service/lan-mouse.service) can be used:
+
+Copy the file to `~/.config/systemd/user/` and enable the service:
+
+```sh
+cp service/lan-mouse.service ~/.config/systemd/user
+systemctl --user daemon-reload
+systemctl --user enable --now lan-mouse.service
+```
+
+## Configuration
+To automatically load clients on startup, the file `$XDG_CONFIG_HOME/lan-mouse/config.toml` is parsed.
+`$XDG_CONFIG_HOME` defaults to `~/.config/`.
+
+To create this file you can copy the following example config:
+
+### Example config
+> [!TIP]
+> key symbols in the release bind are named according
+> to their names in [src/scancode.rs#L172](src/scancode.rs#L172).
+> This is bound to change
+
+```toml
+# example configuration
+
+# configure release bind
+release_bind = [ "KeyA", "KeyS", "KeyD", "KeyF" ]
+
+# optional port (defaults to 4242)
+port = 4242
+# # optional frontend -> defaults to gtk if available
+# # possible values are "cli" and "gtk" 
+# frontend = "gtk"
+
+# define a client on the right side with host name "iridium"
+[right]
+# hostname
+hostname = "iridium"
+# activate this client immediately when lan-mouse is started
+activate_on_startup = true
+# optional list of (known) ip addresses
+ips = ["192.168.178.156"]
+
+# define a client on the left side with IP address 192.168.178.189
+[left]
+# The hostname is optional: When no hostname is specified,
+# at least one ip address needs to be specified.
+hostname = "thorium"
+# ips for ethernet and wifi
+ips = ["192.168.178.189", "192.168.178.172"]
+# optional port
+port = 4242
+```
+
+Where `left` can be either `left`, `right`, `top` or `bottom`.
+
+## Roadmap
+- [x] Graphical frontend (gtk + libadwaita)
+- [x] respect xdg-config-home for config file location.
+- [x] IP Address switching
+- [x] Liveness tracking Automatically ungrab mouse when client unreachable
+- [x] Liveness tracking: Automatically release keys, when server offline
+- [x] MacOS KeyCode Translation
+- [x] Libei Input Capture
+- [ ] X11 Input Capture
+- [ ] Windows Input Capture
+- [ ] MacOS Input Capture
+- [ ] Latency measurement and visualization
+- [ ] Bandwidth usage measurement and visualization
 - [ ] Clipboard support
-- [ ] Graphical frontend (gtk?)
-- [ ] *Encrytion*
-- [ ] Gnome Shell Extension (layer shell is not supported)
-- [ ] respect xdg-config-home for config file location.
+- [ ] *Encryption*
 
 ## Protocol
 Currently *all* mouse and keyboard events are sent via **UDP** for performance reasons.
@@ -207,3 +382,54 @@ would be a better choice for the future and could also help for WIFI connections
 Sending key and mouse event data over the local network might not be the biggest security concern but in any public network or business environment it's *QUITE* a problem to basically broadcast your keystrokes.
 - There should be an encryption layer below the application to enable a secure link.
 - The encryption keys could be generated by the graphical frontend.
+
+
+## Wayland support
+### Input Emulation (for receiving events)
+On wayland input-emulation is in an early/unstable state as of writing this.
+
+For this reason a suitable backend is chosen based on the active desktop environment / compositor.
+
+Different compositors have different ways of enabling input emulation:
+
+#### Wlroots
+Most wlroots-based compositors like Hyprland and Sway support the following
+unstable wayland protocols for keyboard and mouse emulation:
+- [virtual-keyboard-unstable-v1](https://wayland.app/protocols/virtual-keyboard-unstable-v1)
+- [wlr-virtual-pointer-unstable-v1](https://wayland.app/protocols/wlr-virtual-pointer-unstable-v1)
+
+#### KDE
+KDE also has a protocol for input emulation ([kde-fake-input](https://wayland.app/protocols/kde-fake-input)),
+it is however not exposed to third party applications.
+
+The recommended way to emulate input on KDE is the
+[freedesktop remote-desktop-portal](https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.RemoteDesktop).
+
+#### Gnome
+Gnome uses [libei](https://gitlab.freedesktop.org/libinput/libei) for input emulation and capture,
+which has the goal to become the general approach for emulating and capturing Input on Wayland.
+
+### Input capture
+
+To capture mouse and keyboard input, a few things are necessary:
+- Displaying an immovable surface at screen edges
+- Locking the mouse in place
+- (optionally but highly recommended) reading unaccelerated mouse input
+
+|  Required Protocols  (Event Emitting)  | Sway               | Kwin                 | Gnome                |
+|----------------------------------------|--------------------|----------------------|----------------------|
+| pointer-constraints-unstable-v1        | :heavy_check_mark: | :heavy_check_mark:   | :heavy_check_mark:   |
+| relative-pointer-unstable-v1           | :heavy_check_mark: | :heavy_check_mark:   | :heavy_check_mark:   |
+| keyboard-shortcuts-inhibit-unstable-v1 | :heavy_check_mark: | :heavy_check_mark:   | :heavy_check_mark:   |
+| wlr-layer-shell-unstable-v1            | :heavy_check_mark: | :heavy_check_mark:   | :x:                  |
+
+The [zwlr\_virtual\_pointer\_manager\_v1](wlr-virtual-pointer-unstable-v1) is required
+to display surfaces on screen edges and used to display the immovable window on
+both wlroots based compositors and KDE.
+
+Gnome unfortunately does not support this protocol
+and [likely won't ever support it](https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/1141).
+
+~In order for layershell surfaces to be able to lock the pointer using the pointer\_constraints protocol [this patch](https://github.com/swaywm/sway/pull/7178) needs to be applied to sway.~
+(this works natively on sway versions >= 1.8)
+

build.rs

@@ -0,0 +1,9 @@
+fn main() {
+    // composite_templates
+    #[cfg(feature = "gtk")]
+    glib_build_tools::compile_resources(
+        &["resources"],
+        "resources/resources.gresource.xml",
+        "lan-mouse.gresource",
+    );
+}

config.toml

@@ -1,20 +1,28 @@
 # example configuration
 
+# capture_backend = "LayerShell"
+
+# release bind
+release_bind = [ "KeyA", "KeyS", "KeyD", "KeyF" ]
+
 # optional port (defaults to 4242)
 port = 4242
+# optional frontend -> defaults to gtk if available
+# frontend = "gtk"
 
 # define a client on the right side with host name "iridium"
 [right]
 # hostname
-host_name = "iridium"
+hostname = "iridium"
 # optional list of (known) ip addresses
-ips = ["192.168.178.141"]
-# optional port (defaults to 4242)
-port = 4242
+ips = ["192.168.178.156"]
 
 # define a client on the left side with IP address 192.168.178.189
 [left]
 # The hostname is optional: When no hostname is specified,
 # at least one ip address needs to be specified.
-host_name = "thorium"
-ips = ["192.168.178.189"]
+hostname = "thorium"
+# ips for ethernet and wifi
+ips = ["192.168.178.189", "192.168.178.172"]
+# optional port
+port = 4242

de.feschber.LanMouse.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Categories=Utility;
+Comment[en_US]=Mouse & Keyboard sharing via LAN
+Comment=Mouse & Keyboard sharing via LAN
+Comment[de_DE]=Maus- und Tastaturfreigabe über LAN
+Exec=lan-mouse
+Icon=de.feschber.LanMouse
+Name[en_US]=Lan Mouse
+Name=Lan Mouse
+StartupNotify=true
+Terminal=false
+Type=Application

de.feschber.LanMouse.yml

@@ -0,0 +1,14 @@
+app-id: de.feschber.LanMouse
+runtime: org.freedesktop.Platform
+runtime-version: '22.08'
+sdk: org.freedesktop.Sdk
+command: target/release/lan-mouse
+modules:
+  - name: hello
+    buildsystem: simple
+    build-commands:
+      - cargo build --release
+      - install -D lan-mouse /app/bin/lan-mouse
+    sources:
+      - type: file
+        path: target/release/lan-mouse

firewall/lan-mouse.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- for packaging: /usr/lib/firewalld/services/lan-mouse.xml -->
+<!-- configure manually: /etc/firewalld/services/lan-mouse.xml -->
+<service>
+  <short>LAN Mouse</short>
+  <description>mouse and keyboard sharing via LAN</description>
+  <port port="4242" protocol="udp"/>
+</service>

flake.lock

@@ -0,0 +1,82 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1716293225,
+        "narHash": "sha256-pU9ViBVE3XYb70xZx+jK6SEVphvt7xMTbm6yDIF4xPs=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "3eaeaeb6b1e08a016380c279f8846e0bd8808916",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1716257780,
+        "narHash": "sha256-R+NjvJzKEkTVCmdrKRfPE4liX/KMGVqGUwwS5H8ET8A=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "4e5e3d2c5c9b2721bd266f9e43c14e96811b89d2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,64 @@
+{
+  description = "Nix Flake for lan-mouse";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+  outputs = {
+    self,
+    nixpkgs,
+    rust-overlay,
+    ...
+  }: let
+    inherit (nixpkgs) lib;
+    genSystems = lib.genAttrs [
+      "aarch64-darwin"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "x86_64-linux"
+    ];
+    pkgsFor = system:
+      import nixpkgs {
+        inherit system;
+
+        overlays = [
+          rust-overlay.overlays.default
+        ];
+      };
+    mkRustToolchain = pkgs:
+      pkgs.rust-bin.stable.latest.default.override {
+        extensions = ["rust-src"];
+      };
+    pkgs = genSystems (system: import nixpkgs {inherit system;});
+  in {
+    packages = genSystems (system: rec {
+      default = pkgs.${system}.callPackage ./nix {};
+      lan-mouse = default;
+    });
+    homeManagerModules.default = import ./nix/hm-module.nix self;
+    devShells = genSystems (system: let
+      pkgs = pkgsFor system;
+      rust = mkRustToolchain pkgs;
+    in {
+      default = pkgs.mkShell {
+        packages = with pkgs; [
+          rust
+          rust-analyzer-unwrapped
+          pkg-config
+          xorg.libX11
+          gtk4
+          libadwaita
+          librsvg
+          xorg.libXtst
+        ] ++ lib.optionals stdenv.isDarwin [
+          darwin.apple_sdk_11_0.frameworks.CoreGraphics
+        ];
+
+        RUST_SRC_PATH = "${rust}/lib/rustlib/src/rust/library";
+      };
+    });
+  };
+}

input-capture/Cargo.toml

@@ -0,0 +1,70 @@
+[package]
+name = "input-capture"
+description = "cross-platform input-capture library used by lan-mouse"
+version = "0.2.0"
+edition = "2021"
+license = "GPL-3.0-or-later"
+repository = "https://github.com/feschber/lan-mouse"
+
+[dependencies]
+futures = "0.3.28"
+futures-core = "0.3.30"
+log = "0.4.22"
+input-event = { path = "../input-event", version = "0.2.1" }
+memmap = "0.7"
+tempfile = "3.8"
+thiserror = "1.0.61"
+tokio = { version = "1.32.0", features = [
+    "io-util",
+    "io-std",
+    "macros",
+    "net",
+    "process",
+    "rt",
+    "sync",
+    "signal",
+] }
+once_cell = "1.19.0"
+async-trait = "0.1.81"
+tokio-util = "0.7.11"
+
+
+[target.'cfg(all(unix, not(target_os="macos")))'.dependencies]
+wayland-client = { version = "0.31.1", optional = true }
+wayland-protocols = { version = "0.32.1", features = [
+    "client",
+    "staging",
+    "unstable",
+], optional = true }
+wayland-protocols-wlr = { version = "0.3.1", features = [
+    "client",
+], optional = true }
+x11 = { version = "2.21.0", features = ["xlib", "xtest"], optional = true }
+ashpd = { version = "0.9", default-features = false, features = [
+    "tokio",
+], optional = true }
+reis = { version = "0.2", features = ["tokio"], optional = true }
+
+[target.'cfg(target_os="macos")'.dependencies]
+core-graphics = { version = "0.23", features = ["highsierra"] }
+
+[target.'cfg(windows)'.dependencies]
+windows = { version = "0.58.0", features = [
+    "Win32_System_LibraryLoader",
+    "Win32_System_Threading",
+    "Win32_Foundation",
+    "Win32_Graphics",
+    "Win32_Graphics_Gdi",
+    "Win32_UI_Input_KeyboardAndMouse",
+    "Win32_UI_WindowsAndMessaging",
+] }
+
+[features]
+default = ["wayland", "x11", "libei"]
+wayland = [
+    "dep:wayland-client",
+    "dep:wayland-protocols",
+    "dep:wayland-protocols-wlr",
+]
+x11 = ["dep:x11"]
+libei = ["dep:reis", "dep:ashpd"]

input-capture/src/dummy.rs

@@ -0,0 +1,52 @@
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+use async_trait::async_trait;
+use futures_core::Stream;
+
+use input_event::Event;
+
+use crate::CaptureError;
+
+use super::{CaptureHandle, InputCapture, Position};
+
+pub struct DummyInputCapture {}
+
+impl DummyInputCapture {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl Default for DummyInputCapture {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[async_trait]
+impl InputCapture for DummyInputCapture {
+    async fn create(&mut self, _handle: CaptureHandle, _pos: Position) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn destroy(&mut self, _handle: CaptureHandle) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn release(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn terminate(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+}
+
+impl Stream for DummyInputCapture {
+    type Item = Result<(CaptureHandle, Event), CaptureError>;
+
+    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}

input-capture/src/error.rs

@@ -0,0 +1,150 @@
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum InputCaptureError {
+    #[error("error creating input-capture: `{0}`")]
+    Create(#[from] CaptureCreationError),
+    #[error("error while capturing input: `{0}`")]
+    Capture(#[from] CaptureError),
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+use std::io;
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+use wayland_client::{
+    backend::WaylandError,
+    globals::{BindError, GlobalError},
+    ConnectError, DispatchError,
+};
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use ashpd::desktop::ResponseError;
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use reis::tokio::{EiConvertEventStreamError, HandshakeError};
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("error in libei stream: {inner:?}")]
+pub struct ReisConvertEventStreamError {
+    inner: EiConvertEventStreamError,
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+impl From<EiConvertEventStreamError> for ReisConvertEventStreamError {
+    fn from(e: EiConvertEventStreamError) -> Self {
+        Self { inner: e }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum CaptureError {
+    #[error("activation stream closed unexpectedly")]
+    ActivationClosed,
+    #[error("libei stream was closed")]
+    EndOfStream,
+    #[error("io error: `{0}`")]
+    Io(#[from] std::io::Error),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("error in libei stream: `{0}`")]
+    Reis(#[from] ReisConvertEventStreamError),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei handshake failed: `{0}`")]
+    Handshake(#[from] HandshakeError),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error(transparent)]
+    Portal(#[from] ashpd::Error),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei disconnected - reason: `{0}`")]
+    Disconnected(String),
+}
+
+#[derive(Debug, Error)]
+pub enum CaptureCreationError {
+    #[error("no backend available")]
+    NoAvailableBackend,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("error creating input-capture-portal backend: `{0}`")]
+    Libei(#[from] LibeiCaptureCreationError),
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    #[error("error creating layer-shell capture backend: `{0}`")]
+    LayerShell(#[from] LayerShellCaptureCreationError),
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    #[error("error creating x11 capture backend: `{0}`")]
+    X11(#[from] X11InputCaptureCreationError),
+    #[cfg(target_os = "macos")]
+    #[error("error creating macos capture backend: `{0}`")]
+    Macos(#[from] MacOSInputCaptureCreationError),
+    #[cfg(windows)]
+    #[error("error creating windows capture backend")]
+    Windows,
+}
+
+impl CaptureCreationError {
+    /// request was intentionally denied by the user
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    pub(crate) fn cancelled_by_user(&self) -> bool {
+        matches!(
+            self,
+            CaptureCreationError::Libei(LibeiCaptureCreationError::Ashpd(ashpd::Error::Response(
+                ResponseError::Cancelled
+            )))
+        )
+    }
+    #[cfg(not(all(unix, feature = "libei", not(target_os = "macos"))))]
+    pub(crate) fn cancelled_by_user(&self) -> bool {
+        false
+    }
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LibeiCaptureCreationError {
+    #[error("xdg-desktop-portal: `{0}`")]
+    Ashpd(#[from] ashpd::Error),
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("{protocol} protocol not supported: {inner}")]
+pub struct WaylandBindError {
+    inner: BindError,
+    protocol: &'static str,
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl WaylandBindError {
+    pub(crate) fn new(inner: BindError, protocol: &'static str) -> Self {
+        Self { inner, protocol }
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LayerShellCaptureCreationError {
+    #[error(transparent)]
+    Connect(#[from] ConnectError),
+    #[error(transparent)]
+    Global(#[from] GlobalError),
+    #[error(transparent)]
+    Wayland(#[from] WaylandError),
+    #[error(transparent)]
+    Bind(#[from] WaylandBindError),
+    #[error(transparent)]
+    Dispatch(#[from] DispatchError),
+    #[error(transparent)]
+    Io(#[from] io::Error),
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum X11InputCaptureCreationError {
+    #[error("X11 input capture is not yet implemented :(")]
+    NotImplemented,
+}
+
+#[cfg(target_os = "macos")]
+#[derive(Debug, Error)]
+pub enum MacOSInputCaptureCreationError {
+    #[error("MacOS input capture is not yet implemented :(")]
+    NotImplemented,
+}

input-capture/src/lib.rs

@@ -0,0 +1,170 @@
+use std::fmt::Display;
+
+use async_trait::async_trait;
+use futures_core::Stream;
+
+use input_event::Event;
+
+pub use error::{CaptureCreationError, CaptureError, InputCaptureError};
+
+pub mod error;
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+pub mod libei;
+
+#[cfg(target_os = "macos")]
+pub mod macos;
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+pub mod wayland;
+
+#[cfg(windows)]
+pub mod windows;
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+pub mod x11;
+
+/// fallback input capture (does not produce events)
+pub mod dummy;
+
+pub type CaptureHandle = u64;
+
+#[derive(Debug, Clone, Copy, Eq, Hash, PartialEq)]
+pub enum Position {
+    Left,
+    Right,
+    Top,
+    Bottom,
+}
+
+impl Position {
+    pub fn opposite(&self) -> Self {
+        match self {
+            Position::Left => Self::Right,
+            Position::Right => Self::Left,
+            Position::Top => Self::Bottom,
+            Position::Bottom => Self::Top,
+        }
+    }
+}
+
+impl Display for Position {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let pos = match self {
+            Position::Left => "left",
+            Position::Right => "right",
+            Position::Top => "top",
+            Position::Bottom => "bottom",
+        };
+        write!(f, "{}", pos)
+    }
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum Backend {
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    InputCapturePortal,
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    LayerShell,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl Display for Backend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            Backend::InputCapturePortal => write!(f, "input-capture-portal"),
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            Backend::LayerShell => write!(f, "layer-shell"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            Backend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            Backend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            Backend::MacOs => write!(f, "MacOS"),
+            Backend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+#[async_trait]
+pub trait InputCapture:
+    Stream<Item = Result<(CaptureHandle, Event), CaptureError>> + Unpin
+{
+    /// create a new client with the given id
+    async fn create(&mut self, id: CaptureHandle, pos: Position) -> Result<(), CaptureError>;
+
+    /// destroy the client with the given id, if it exists
+    async fn destroy(&mut self, id: CaptureHandle) -> Result<(), CaptureError>;
+
+    /// release mouse
+    async fn release(&mut self) -> Result<(), CaptureError>;
+
+    /// destroy the input capture
+    async fn terminate(&mut self) -> Result<(), CaptureError>;
+}
+
+pub async fn create_backend(
+    backend: Backend,
+) -> Result<
+    Box<dyn InputCapture<Item = Result<(CaptureHandle, Event), CaptureError>>>,
+    CaptureCreationError,
+> {
+    match backend {
+        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+        Backend::InputCapturePortal => Ok(Box::new(libei::LibeiInputCapture::new().await?)),
+        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+        Backend::LayerShell => Ok(Box::new(wayland::WaylandInputCapture::new()?)),
+        #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+        Backend::X11 => Ok(Box::new(x11::X11InputCapture::new()?)),
+        #[cfg(windows)]
+        Backend::Windows => Ok(Box::new(windows::WindowsInputCapture::new())),
+        #[cfg(target_os = "macos")]
+        Backend::MacOs => Ok(Box::new(macos::MacOSInputCapture::new()?)),
+        Backend::Dummy => Ok(Box::new(dummy::DummyInputCapture::new())),
+    }
+}
+
+pub async fn create(
+    backend: Option<Backend>,
+) -> Result<
+    Box<dyn InputCapture<Item = Result<(CaptureHandle, Event), CaptureError>>>,
+    CaptureCreationError,
+> {
+    if let Some(backend) = backend {
+        let b = create_backend(backend).await;
+        if b.is_ok() {
+            log::info!("using capture backend: {backend}");
+        }
+        return b;
+    }
+
+    for backend in [
+        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+        Backend::InputCapturePortal,
+        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+        Backend::LayerShell,
+        #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+        Backend::X11,
+        #[cfg(windows)]
+        Backend::Windows,
+        #[cfg(target_os = "macos")]
+        Backend::MacOs,
+    ] {
+        match create_backend(backend).await {
+            Ok(b) => {
+                log::info!("using capture backend: {backend}");
+                return Ok(b);
+            }
+            Err(e) if e.cancelled_by_user() => return Err(e),
+            Err(e) => log::warn!("{backend} input capture backend unavailable: {e}"),
+        }
+    }
+    Err(CaptureCreationError::NoAvailableBackend)
+}

input-capture/src/libei.rs

@@ -0,0 +1,641 @@
+use ashpd::{
+    desktop::{
+        input_capture::{Activated, Barrier, BarrierID, Capabilities, InputCapture, Region, Zones},
+        Session,
+    },
+    enumflags2::BitFlags,
+};
+use async_trait::async_trait;
+use futures::{FutureExt, StreamExt};
+use reis::{
+    ei,
+    event::{DeviceCapability, EiEvent},
+    tokio::{EiConvertEventStream, EiEventStream},
+};
+use std::{
+    cell::Cell,
+    collections::HashMap,
+    io,
+    os::unix::net::UnixStream,
+    pin::Pin,
+    rc::Rc,
+    sync::Arc,
+    task::{Context, Poll},
+};
+use tokio::{
+    sync::{
+        mpsc::{self, Receiver, Sender},
+        Notify,
+    },
+    task::JoinHandle,
+};
+use tokio_util::sync::CancellationToken;
+
+use futures_core::Stream;
+use once_cell::sync::Lazy;
+
+use input_event::Event;
+
+use super::{
+    error::{CaptureError, LibeiCaptureCreationError, ReisConvertEventStreamError},
+    CaptureHandle, InputCapture as LanMouseInputCapture, Position,
+};
+
+/* there is a bug in xdg-remote-desktop-portal-gnome / mutter that
+ * prevents receiving further events after a session has been disabled once.
+ * Therefore the session needs to be recreated when the barriers are updated */
+
+/// events that necessitate restarting the capture session
+#[derive(Clone, Copy, Debug)]
+enum LibeiNotifyEvent {
+    Create(CaptureHandle, Position),
+    Destroy(CaptureHandle),
+}
+
+#[allow(dead_code)]
+pub struct LibeiInputCapture<'a> {
+    input_capture: Pin<Box<InputCapture<'a>>>,
+    capture_task: JoinHandle<Result<(), CaptureError>>,
+    event_rx: Receiver<(CaptureHandle, Event)>,
+    notify_capture: Sender<LibeiNotifyEvent>,
+    notify_release: Arc<Notify>,
+    cancellation_token: CancellationToken,
+    terminated: bool,
+}
+
+static INTERFACES: Lazy<HashMap<&'static str, u32>> = Lazy::new(|| {
+    let mut m = HashMap::new();
+    m.insert("ei_connection", 1);
+    m.insert("ei_callback", 1);
+    m.insert("ei_pingpong", 1);
+    m.insert("ei_seat", 1);
+    m.insert("ei_device", 2);
+    m.insert("ei_pointer", 1);
+    m.insert("ei_pointer_absolute", 1);
+    m.insert("ei_scroll", 1);
+    m.insert("ei_button", 1);
+    m.insert("ei_keyboard", 1);
+    m.insert("ei_touchscreen", 1);
+    m
+});
+
+/// returns (start pos, end pos), inclusive
+fn pos_to_barrier(r: &Region, pos: Position) -> (i32, i32, i32, i32) {
+    let (x, y) = (r.x_offset(), r.y_offset());
+    let (w, h) = (r.width() as i32, r.height() as i32);
+    match pos {
+        Position::Left => (x, y, x, y + h - 1),
+        Position::Right => (x + w, y, x + w, y + h - 1),
+        Position::Top => (x, y, x + w - 1, y),
+        Position::Bottom => (x, y + h, x + w - 1, y + h),
+    }
+}
+
+/// Ashpd does not expose fields
+#[derive(Clone, Copy, Debug)]
+struct ICBarrier {
+    barrier_id: BarrierID,
+    position: (i32, i32, i32, i32),
+}
+
+impl ICBarrier {
+    fn new(barrier_id: BarrierID, position: (i32, i32, i32, i32)) -> Self {
+        Self {
+            barrier_id,
+            position,
+        }
+    }
+}
+
+impl From<ICBarrier> for Barrier {
+    fn from(barrier: ICBarrier) -> Self {
+        Barrier::new(barrier.barrier_id, barrier.position)
+    }
+}
+
+fn select_barriers(
+    zones: &Zones,
+    clients: &[(CaptureHandle, Position)],
+    next_barrier_id: &mut u32,
+) -> (Vec<ICBarrier>, HashMap<BarrierID, CaptureHandle>) {
+    let mut client_for_barrier = HashMap::new();
+    let mut barriers: Vec<ICBarrier> = vec![];
+
+    for (handle, pos) in clients {
+        let mut client_barriers = zones
+            .regions()
+            .iter()
+            .map(|r| {
+                let id = *next_barrier_id;
+                *next_barrier_id = id + 1;
+                let position = pos_to_barrier(r, *pos);
+                client_for_barrier.insert(id, *handle);
+                ICBarrier::new(id, position)
+            })
+            .collect();
+        barriers.append(&mut client_barriers);
+    }
+    (barriers, client_for_barrier)
+}
+
+async fn update_barriers(
+    input_capture: &InputCapture<'_>,
+    session: &Session<'_, InputCapture<'_>>,
+    active_clients: &[(CaptureHandle, Position)],
+    next_barrier_id: &mut u32,
+) -> Result<(Vec<ICBarrier>, HashMap<BarrierID, CaptureHandle>), ashpd::Error> {
+    let zones = input_capture.zones(session).await?.response()?;
+    log::debug!("zones: {zones:?}");
+
+    let (barriers, id_map) = select_barriers(&zones, active_clients, next_barrier_id);
+    log::debug!("barriers: {barriers:?}");
+    log::debug!("client for barrier id: {id_map:?}");
+
+    let ashpd_barriers: Vec<Barrier> = barriers.iter().copied().map(|b| b.into()).collect();
+    let response = input_capture
+        .set_pointer_barriers(session, &ashpd_barriers, zones.zone_set())
+        .await?;
+    let response = response.response()?;
+    log::debug!("{response:?}");
+    Ok((barriers, id_map))
+}
+
+async fn create_session<'a>(
+    input_capture: &'a InputCapture<'a>,
+) -> std::result::Result<(Session<'_, InputCapture<'_>>, BitFlags<Capabilities>), ashpd::Error> {
+    log::debug!("creating input capture session");
+    input_capture
+        .create_session(
+            &ashpd::WindowIdentifier::default(),
+            Capabilities::Keyboard | Capabilities::Pointer | Capabilities::Touchscreen,
+        )
+        .await
+}
+
+async fn connect_to_eis(
+    input_capture: &InputCapture<'_>,
+    session: &Session<'_, InputCapture<'_>>,
+) -> Result<(ei::Context, EiConvertEventStream), CaptureError> {
+    log::debug!("connect_to_eis");
+    let fd = input_capture.connect_to_eis(session).await?;
+
+    // create unix stream from fd
+    let stream = UnixStream::from(fd);
+    stream.set_nonblocking(true)?;
+
+    // create ei context
+    let context = ei::Context::new(stream)?;
+    let mut event_stream = EiEventStream::new(context.clone())?;
+    let response = reis::tokio::ei_handshake(
+        &mut event_stream,
+        "de.feschber.LanMouse",
+        ei::handshake::ContextType::Receiver,
+        &INTERFACES,
+    )
+    .await?;
+    let event_stream = EiConvertEventStream::new(event_stream, response.serial);
+
+    Ok((context, event_stream))
+}
+
+async fn libei_event_handler(
+    mut ei_event_stream: EiConvertEventStream,
+    context: ei::Context,
+    event_tx: Sender<(CaptureHandle, Event)>,
+    release_session: Arc<Notify>,
+    current_client: Rc<Cell<Option<CaptureHandle>>>,
+) -> Result<(), CaptureError> {
+    loop {
+        let ei_event = ei_event_stream
+            .next()
+            .await
+            .ok_or(CaptureError::EndOfStream)?
+            .map_err(ReisConvertEventStreamError::from)?;
+        log::trace!("from ei: {ei_event:?}");
+        let client = current_client.get();
+        handle_ei_event(ei_event, client, &context, &event_tx, &release_session).await?;
+    }
+}
+
+impl<'a> LibeiInputCapture<'a> {
+    pub async fn new() -> std::result::Result<Self, LibeiCaptureCreationError> {
+        let input_capture = Box::pin(InputCapture::new().await?);
+        let input_capture_ptr = input_capture.as_ref().get_ref() as *const InputCapture<'static>;
+        let first_session = Some(create_session(unsafe { &*input_capture_ptr }).await?);
+
+        let (event_tx, event_rx) = mpsc::channel(1);
+        let (notify_capture, notify_rx) = mpsc::channel(1);
+        let notify_release = Arc::new(Notify::new());
+
+        let cancellation_token = CancellationToken::new();
+
+        let capture = do_capture(
+            input_capture_ptr,
+            notify_rx,
+            notify_release.clone(),
+            first_session,
+            event_tx,
+            cancellation_token.clone(),
+        );
+        let capture_task = tokio::task::spawn_local(capture);
+
+        let producer = Self {
+            input_capture,
+            event_rx,
+            capture_task,
+            notify_capture,
+            notify_release,
+            cancellation_token,
+            terminated: false,
+        };
+
+        Ok(producer)
+    }
+}
+
+async fn do_capture(
+    input_capture: *const InputCapture<'static>,
+    mut capture_event: Receiver<LibeiNotifyEvent>,
+    notify_release: Arc<Notify>,
+    session: Option<(Session<'_, InputCapture<'_>>, BitFlags<Capabilities>)>,
+    event_tx: Sender<(CaptureHandle, Event)>,
+    cancellation_token: CancellationToken,
+) -> Result<(), CaptureError> {
+    let mut session = session.map(|s| s.0);
+
+    /* safety: libei_task does not outlive Self */
+    let input_capture = unsafe { &*input_capture };
+    let mut active_clients: Vec<(CaptureHandle, Position)> = vec![];
+    let mut next_barrier_id = 1u32;
+
+    let mut zones_changed = input_capture.receive_zones_changed().await?;
+
+    loop {
+        // do capture session
+        let cancel_session = CancellationToken::new();
+        let cancel_update = CancellationToken::new();
+
+        let mut capture_event_occured: Option<LibeiNotifyEvent> = None;
+        let mut zones_have_changed = false;
+
+        // kill session if clients need to be updated
+        let handle_session_update_request = async {
+            tokio::select! {
+                _ = cancellation_token.cancelled() => {
+                    log::debug!("cancelled")
+                }, /* exit requested */
+                _ = cancel_update.cancelled() => {
+                    log::debug!("update task cancelled");
+                }, /* session exited */
+                _ = zones_changed.next() => {
+                    log::debug!("zones changed!");
+                    zones_have_changed = true
+                }, /* zones have changed */
+                e = capture_event.recv() => if let Some(e) = e { /* clients changed */
+                    log::debug!("capture event: {e:?}");
+                    capture_event_occured.replace(e);
+                },
+            }
+            // kill session (might already be dead!)
+            log::debug!("=> cancelling session");
+            cancel_session.cancel();
+        };
+
+        if !active_clients.is_empty() {
+            // create session
+            let mut session = match session.take() {
+                Some(s) => s,
+                None => create_session(input_capture).await?.0,
+            };
+
+            let capture_session = do_capture_session(
+                input_capture,
+                &mut session,
+                &event_tx,
+                &active_clients,
+                &mut next_barrier_id,
+                &notify_release,
+                (cancel_session.clone(), cancel_update.clone()),
+            );
+
+            let (capture_result, ()) = tokio::join!(capture_session, handle_session_update_request);
+            log::debug!("capture session + session_update task done!");
+
+            // disable capture
+            log::debug!("disabling input capture");
+            if let Err(e) = input_capture.disable(&session).await {
+                log::warn!("input_capture.disable(&session) {e}");
+            }
+            if let Err(e) = session.close().await {
+                log::warn!("session.close(): {e}");
+            }
+
+            // propagate error from capture session
+            capture_result?;
+        } else {
+            handle_session_update_request.await;
+        }
+
+        // update clients if requested
+        if let Some(event) = capture_event_occured.take() {
+            match event {
+                LibeiNotifyEvent::Create(c, p) => active_clients.push((c, p)),
+                LibeiNotifyEvent::Destroy(c) => active_clients.retain(|(h, _)| *h != c),
+            }
+        }
+
+        // break
+        if cancellation_token.is_cancelled() {
+            break Ok(());
+        }
+    }
+}
+
+async fn do_capture_session(
+    input_capture: &InputCapture<'_>,
+    session: &mut Session<'_, InputCapture<'_>>,
+    event_tx: &Sender<(CaptureHandle, Event)>,
+    active_clients: &[(CaptureHandle, Position)],
+    next_barrier_id: &mut u32,
+    notify_release: &Notify,
+    cancel: (CancellationToken, CancellationToken),
+) -> Result<(), CaptureError> {
+    let (cancel_session, cancel_update) = cancel;
+    // current client
+    let current_client = Rc::new(Cell::new(None));
+
+    // connect to eis server
+    let (context, ei_event_stream) = connect_to_eis(input_capture, session).await?;
+
+    // set barriers
+    let (barriers, client_for_barrier_id) =
+        update_barriers(input_capture, session, active_clients, next_barrier_id).await?;
+
+    log::debug!("enabling session");
+    input_capture.enable(session).await?;
+
+    // cancellation token to release session
+    let release_session = Arc::new(Notify::new());
+
+    // async event task
+    let cancel_ei_handler = CancellationToken::new();
+    let event_chan = event_tx.clone();
+    let client = current_client.clone();
+    let cancel_session_clone = cancel_session.clone();
+    let release_session_clone = release_session.clone();
+    let cancel_ei_handler_clone = cancel_ei_handler.clone();
+    let ei_task = async move {
+        tokio::select! {
+            r = libei_event_handler(
+                ei_event_stream,
+                context,
+                event_chan,
+                release_session_clone,
+                client,
+            ) => {
+                log::debug!("libei exited: {r:?} cancelling session task");
+                cancel_session_clone.cancel();
+            }
+            _ = cancel_ei_handler_clone.cancelled() => {},
+        }
+        Ok::<(), CaptureError>(())
+    };
+
+    let capture_session_task = async {
+        // receiver for activation tokens
+        let mut activated = input_capture.receive_activated().await?;
+        let mut ei_devices_changed = false;
+        loop {
+            tokio::select! {
+                activated = activated.next() => {
+                    let activated = activated.ok_or(CaptureError::ActivationClosed)?;
+                    log::debug!("activated: {activated:?}");
+
+                    // get barrier id from activation
+                    let barrier_id = match activated.barrier_id() {
+                        Some(bid) => bid,
+                        // workaround for KDE plasma not reporting barrier ids
+                        None => find_corresponding_client(&barriers, activated.cursor_position().expect("no cursor position reported by compositor")),
+                    };
+
+                    // find client corresponding to barrier
+                    let client = *client_for_barrier_id.get(&barrier_id).expect("invalid barrier id");
+                    current_client.replace(Some(client));
+
+                    // client entered => send event
+                    event_tx.send((client, Event::Enter())).await.expect("no channel");
+
+                    tokio::select! {
+                        _ = notify_release.notified() => { /* capture release */
+                            log::debug!("release session requested");
+                        },
+                        _ = release_session.notified() => { /* release session */
+                            log::debug!("ei devices changed");
+                            ei_devices_changed = true;
+                        },
+                        _ = cancel_session.cancelled() => { /* kill session notify */
+                            log::debug!("session cancel requested");
+                            break
+                        },
+                    }
+
+                    release_capture(input_capture, session, activated, client, active_clients).await?;
+
+                }
+                _ = notify_release.notified() => { /* capture release -> we are not capturing anyway, so ignore */
+                    log::debug!("release session requested");
+                },
+                _ = release_session.notified() => { /* release session */
+                    log::debug!("ei devices changed");
+                    ei_devices_changed = true;
+                },
+                _ = cancel_session.cancelled() => { /* kill session notify */
+                    log::debug!("session cancel requested");
+                    break
+                },
+            }
+            if ei_devices_changed {
+                /* for whatever reason, GNOME seems to kill the session
+                 * as soon as devices are added or removed, so we need
+                 * to cancel */
+                break;
+            }
+        }
+        // cancel libei task
+        log::debug!("session exited: killing libei task");
+        cancel_ei_handler.cancel();
+        Ok::<(), CaptureError>(())
+    };
+
+    let (a, b) = tokio::join!(ei_task, capture_session_task);
+
+    cancel_update.cancel();
+
+    log::debug!("both session and ei task finished!");
+    a?;
+    b?;
+
+    Ok(())
+}
+
+async fn release_capture<'a>(
+    input_capture: &InputCapture<'a>,
+    session: &Session<'a, InputCapture<'a>>,
+    activated: Activated,
+    current_client: CaptureHandle,
+    active_clients: &[(CaptureHandle, Position)],
+) -> Result<(), CaptureError> {
+    if let Some(activation_id) = activated.activation_id() {
+        log::debug!("releasing input capture {activation_id}");
+    }
+    let (x, y) = activated
+        .cursor_position()
+        .expect("compositor did not report cursor position!");
+    log::debug!("client entered @ ({x}, {y})");
+    let pos = active_clients
+        .iter()
+        .filter(|(c, _)| *c == current_client)
+        .map(|(_, p)| p)
+        .next()
+        .unwrap(); // FIXME
+    let (dx, dy) = match pos {
+        // offset cursor position to not enter again immediately
+        Position::Left => (1., 0.),
+        Position::Right => (-1., 0.),
+        Position::Top => (0., 1.),
+        Position::Bottom => (0., -1.),
+    };
+    // release 1px to the right of the entered zone
+    let cursor_position = (x as f64 + dx, y as f64 + dy);
+    input_capture
+        .release(session, activated.activation_id(), Some(cursor_position))
+        .await?;
+    Ok(())
+}
+
+fn find_corresponding_client(barriers: &[ICBarrier], pos: (f32, f32)) -> BarrierID {
+    barriers
+        .iter()
+        .copied()
+        .min_by_key(|b| {
+            let (x1, y1, x2, y2) = b.position;
+            let (x1, y1, x2, y2) = (x1 as f32, y1 as f32, x2 as f32, y2 as f32);
+            distance_to_line(((x1, y1), (x2, y2)), pos) as i32
+        })
+        .expect("could not find barrier corresponding to client")
+        .barrier_id
+}
+
+fn distance_to_line(line: ((f32, f32), (f32, f32)), p: (f32, f32)) -> f32 {
+    let ((x1, y1), (x2, y2)) = line;
+    let (x0, y0) = p;
+    /*
+     * we use the fact that for the triangle spanned by the line and p,
+     * the height of the triangle is the desired distance and can be calculated by
+     * h = 2A / b with b being the line_length and
+     */
+    let double_triangle_area = ((y2 - y1) * x0 - (x2 - x1) * y0 + x2 * y1 - y2 * x1).abs();
+    let line_length = ((y2 - y1).powf(2.0) + (x2 - x1).powf(2.0)).sqrt();
+    let distance = double_triangle_area / line_length;
+    log::debug!("distance to line({line:?}, {p:?}) = {distance}");
+    distance
+}
+
+static ALL_CAPABILITIES: &[DeviceCapability] = &[
+    DeviceCapability::Pointer,
+    DeviceCapability::PointerAbsolute,
+    DeviceCapability::Keyboard,
+    DeviceCapability::Touch,
+    DeviceCapability::Scroll,
+    DeviceCapability::Button,
+];
+
+async fn handle_ei_event(
+    ei_event: EiEvent,
+    current_client: Option<CaptureHandle>,
+    context: &ei::Context,
+    event_tx: &Sender<(CaptureHandle, Event)>,
+    release_session: &Notify,
+) -> Result<(), CaptureError> {
+    match ei_event {
+        EiEvent::SeatAdded(s) => {
+            s.seat.bind_capabilities(ALL_CAPABILITIES);
+            context.flush().map_err(|e| io::Error::new(e.kind(), e))?;
+        }
+        EiEvent::SeatRemoved(_) | /* EiEvent::DeviceAdded(_) | */ EiEvent::DeviceRemoved(_) => {
+            log::debug!("releasing session: {ei_event:?}");
+            release_session.notify_waiters();
+        }
+        EiEvent::DevicePaused(_) | EiEvent::DeviceResumed(_) => {}
+        EiEvent::DeviceStartEmulating(_) => log::debug!("START EMULATING"),
+        EiEvent::DeviceStopEmulating(_) => log::debug!("STOP EMULATING"),
+        EiEvent::Disconnected(d) => {
+            return Err(CaptureError::Disconnected(format!("{:?}", d.reason)))
+        }
+        _ => {
+            if let Some(handle) = current_client {
+                for event in Event::from_ei_event(ei_event) {
+                    event_tx.send((handle, event)).await.expect("no channel");
+                }
+            }
+        }
+    }
+    Ok(())
+}
+
+#[async_trait]
+impl<'a> LanMouseInputCapture for LibeiInputCapture<'a> {
+    async fn create(&mut self, handle: CaptureHandle, pos: Position) -> Result<(), CaptureError> {
+        let _ = self
+            .notify_capture
+            .send(LibeiNotifyEvent::Create(handle, pos))
+            .await;
+        Ok(())
+    }
+
+    async fn destroy(&mut self, handle: CaptureHandle) -> Result<(), CaptureError> {
+        let _ = self
+            .notify_capture
+            .send(LibeiNotifyEvent::Destroy(handle))
+            .await;
+        Ok(())
+    }
+
+    async fn release(&mut self) -> Result<(), CaptureError> {
+        self.notify_release.notify_waiters();
+        Ok(())
+    }
+
+    async fn terminate(&mut self) -> Result<(), CaptureError> {
+        self.cancellation_token.cancel();
+        let task = &mut self.capture_task;
+        log::debug!("waiting for capture to terminate...");
+        let res = task.await.expect("libei task panic");
+        log::debug!("done!");
+        self.terminated = true;
+        res
+    }
+}
+
+impl<'a> Drop for LibeiInputCapture<'a> {
+    fn drop(&mut self) {
+        if !self.terminated {
+            /* this workaround is needed until async drop is stabilized */
+            panic!("LibeiInputCapture dropped without being terminated!");
+        }
+    }
+}
+
+impl<'a> Stream for LibeiInputCapture<'a> {
+    type Item = Result<(CaptureHandle, Event), CaptureError>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        match self.capture_task.poll_unpin(cx) {
+            Poll::Ready(r) => match r.expect("failed to join") {
+                Ok(()) => Poll::Ready(None),
+                Err(e) => Poll::Ready(Some(Err(e))),
+            },
+            Poll::Pending => self.event_rx.poll_recv(cx).map(|e| e.map(Result::Ok)),
+        }
+    }
+}

input-capture/src/macos.rs

@@ -0,0 +1,43 @@
+use crate::{
+    error::MacOSInputCaptureCreationError, CaptureError, CaptureHandle, InputCapture, Position,
+};
+use async_trait::async_trait;
+use futures_core::Stream;
+use input_event::Event;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+pub struct MacOSInputCapture;
+
+impl MacOSInputCapture {
+    pub fn new() -> std::result::Result<Self, MacOSInputCaptureCreationError> {
+        Err(MacOSInputCaptureCreationError::NotImplemented)
+    }
+}
+
+impl Stream for MacOSInputCapture {
+    type Item = Result<(CaptureHandle, Event), CaptureError>;
+
+    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}
+
+#[async_trait]
+impl InputCapture for MacOSInputCapture {
+    async fn create(&mut self, _id: CaptureHandle, _pos: Position) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn destroy(&mut self, _id: CaptureHandle) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn release(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn terminate(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+}

input-capture/src/wayland.rs

@@ -0,0 +1,999 @@
+use async_trait::async_trait;
+use futures_core::Stream;
+use memmap::MmapOptions;
+use std::{
+    collections::VecDeque,
+    env,
+    io::{self, ErrorKind},
+    os::fd::{AsFd, OwnedFd, RawFd},
+    pin::Pin,
+    task::{ready, Context, Poll},
+};
+use tokio::io::unix::AsyncFd;
+
+use std::{
+    fs::File,
+    io::{BufWriter, Write},
+    os::unix::prelude::{AsRawFd, FromRawFd},
+    sync::Arc,
+};
+
+use wayland_protocols::{
+    wp::{
+        keyboard_shortcuts_inhibit::zv1::client::{
+            zwp_keyboard_shortcuts_inhibit_manager_v1::ZwpKeyboardShortcutsInhibitManagerV1,
+            zwp_keyboard_shortcuts_inhibitor_v1::ZwpKeyboardShortcutsInhibitorV1,
+        },
+        pointer_constraints::zv1::client::{
+            zwp_locked_pointer_v1::ZwpLockedPointerV1,
+            zwp_pointer_constraints_v1::{Lifetime, ZwpPointerConstraintsV1},
+        },
+        relative_pointer::zv1::client::{
+            zwp_relative_pointer_manager_v1::ZwpRelativePointerManagerV1,
+            zwp_relative_pointer_v1::{self, ZwpRelativePointerV1},
+        },
+    },
+    xdg::xdg_output::zv1::client::{
+        zxdg_output_manager_v1::ZxdgOutputManagerV1,
+        zxdg_output_v1::{self, ZxdgOutputV1},
+    },
+};
+
+use wayland_protocols_wlr::layer_shell::v1::client::{
+    zwlr_layer_shell_v1::{Layer, ZwlrLayerShellV1},
+    zwlr_layer_surface_v1::{self, Anchor, KeyboardInteractivity, ZwlrLayerSurfaceV1},
+};
+
+use wayland_client::{
+    backend::{ReadEventsGuard, WaylandError},
+    delegate_noop,
+    globals::{registry_queue_init, GlobalListContents},
+    protocol::{
+        wl_buffer, wl_compositor,
+        wl_keyboard::{self, WlKeyboard},
+        wl_output::{self, WlOutput},
+        wl_pointer::{self, WlPointer},
+        wl_region, wl_registry, wl_seat, wl_shm, wl_shm_pool,
+        wl_surface::WlSurface,
+    },
+    Connection, Dispatch, DispatchError, EventQueue, QueueHandle, WEnum,
+};
+
+use tempfile;
+
+use input_event::{Event, KeyboardEvent, PointerEvent};
+
+use crate::CaptureError;
+
+use super::{
+    error::{LayerShellCaptureCreationError, WaylandBindError},
+    CaptureHandle, InputCapture, Position,
+};
+
+struct Globals {
+    compositor: wl_compositor::WlCompositor,
+    pointer_constraints: ZwpPointerConstraintsV1,
+    relative_pointer_manager: ZwpRelativePointerManagerV1,
+    shortcut_inhibit_manager: ZwpKeyboardShortcutsInhibitManagerV1,
+    seat: wl_seat::WlSeat,
+    shm: wl_shm::WlShm,
+    layer_shell: ZwlrLayerShellV1,
+    outputs: Vec<WlOutput>,
+    xdg_output_manager: ZxdgOutputManagerV1,
+}
+
+#[derive(Debug, Clone)]
+struct OutputInfo {
+    name: String,
+    position: (i32, i32),
+    size: (i32, i32),
+}
+
+impl OutputInfo {
+    fn new() -> Self {
+        Self {
+            name: "".to_string(),
+            position: (0, 0),
+            size: (0, 0),
+        }
+    }
+}
+
+struct State {
+    pointer: Option<WlPointer>,
+    keyboard: Option<WlKeyboard>,
+    pointer_lock: Option<ZwpLockedPointerV1>,
+    rel_pointer: Option<ZwpRelativePointerV1>,
+    shortcut_inhibitor: Option<ZwpKeyboardShortcutsInhibitorV1>,
+    client_for_window: Vec<(Arc<Window>, CaptureHandle)>,
+    focused: Option<(Arc<Window>, CaptureHandle)>,
+    g: Globals,
+    wayland_fd: OwnedFd,
+    read_guard: Option<ReadEventsGuard>,
+    qh: QueueHandle<Self>,
+    pending_events: VecDeque<(CaptureHandle, Event)>,
+    output_info: Vec<(WlOutput, OutputInfo)>,
+    scroll_discrete_pending: bool,
+}
+
+struct Inner {
+    state: State,
+    queue: EventQueue<State>,
+}
+
+impl AsRawFd for Inner {
+    fn as_raw_fd(&self) -> RawFd {
+        self.state.wayland_fd.as_raw_fd()
+    }
+}
+
+pub struct WaylandInputCapture(AsyncFd<Inner>);
+
+struct Window {
+    buffer: wl_buffer::WlBuffer,
+    surface: WlSurface,
+    layer_surface: ZwlrLayerSurfaceV1,
+    pos: Position,
+}
+
+impl Window {
+    fn new(
+        state: &State,
+        qh: &QueueHandle<State>,
+        output: &WlOutput,
+        pos: Position,
+        size: (i32, i32),
+    ) -> Window {
+        log::debug!("creating window output: {output:?}, size: {size:?}");
+        let g = &state.g;
+
+        let (width, height) = match pos {
+            Position::Left | Position::Right => (1, size.1 as u32),
+            Position::Top | Position::Bottom => (size.0 as u32, 1),
+        };
+        let mut file = tempfile::tempfile().unwrap();
+        draw(&mut file, (width, height));
+        let pool = g
+            .shm
+            .create_pool(file.as_fd(), (width * height * 4) as i32, qh, ());
+        let buffer = pool.create_buffer(
+            0,
+            width as i32,
+            height as i32,
+            (width * 4) as i32,
+            wl_shm::Format::Argb8888,
+            qh,
+            (),
+        );
+        let surface = g.compositor.create_surface(qh, ());
+
+        let layer_surface = g.layer_shell.get_layer_surface(
+            &surface,
+            Some(output),
+            Layer::Overlay,
+            "LAN Mouse Sharing".into(),
+            qh,
+            (),
+        );
+        let anchor = match pos {
+            Position::Left => Anchor::Left,
+            Position::Right => Anchor::Right,
+            Position::Top => Anchor::Top,
+            Position::Bottom => Anchor::Bottom,
+        };
+
+        layer_surface.set_anchor(anchor);
+        layer_surface.set_size(width, height);
+        layer_surface.set_exclusive_zone(-1);
+        layer_surface.set_margin(0, 0, 0, 0);
+        surface.set_input_region(None);
+        surface.commit();
+        Window {
+            pos,
+            buffer,
+            surface,
+            layer_surface,
+        }
+    }
+}
+
+impl Drop for Window {
+    fn drop(&mut self) {
+        log::debug!("destroying window!");
+        self.layer_surface.destroy();
+        self.surface.destroy();
+        self.buffer.destroy();
+    }
+}
+
+fn get_edges(outputs: &[(WlOutput, OutputInfo)], pos: Position) -> Vec<(WlOutput, i32)> {
+    outputs
+        .iter()
+        .map(|(o, i)| {
+            (
+                o.clone(),
+                match pos {
+                    Position::Left => i.position.0,
+                    Position::Right => i.position.0 + i.size.0,
+                    Position::Top => i.position.1,
+                    Position::Bottom => i.position.1 + i.size.1,
+                },
+            )
+        })
+        .collect()
+}
+
+fn get_output_configuration(state: &State, pos: Position) -> Vec<(WlOutput, OutputInfo)> {
+    // get all output edges corresponding to the position
+    let edges = get_edges(&state.output_info, pos);
+    log::debug!("edges: {edges:?}");
+    let opposite_edges = get_edges(&state.output_info, pos.opposite());
+
+    // remove those edges that are at the same position
+    // as an opposite edge of a different output
+    let outputs: Vec<WlOutput> = edges
+        .iter()
+        .filter(|(_, edge)| !opposite_edges.iter().map(|(_, e)| *e).any(|e| &e == edge))
+        .map(|(o, _)| o.clone())
+        .collect();
+    state
+        .output_info
+        .iter()
+        .filter(|(o, _)| outputs.contains(o))
+        .map(|(o, i)| (o.clone(), i.clone()))
+        .collect()
+}
+
+fn draw(f: &mut File, (width, height): (u32, u32)) {
+    let mut buf = BufWriter::new(f);
+    for _ in 0..height {
+        for _ in 0..width {
+            if env::var("LM_DEBUG_LAYER_SHELL").ok().is_some() {
+                // AARRGGBB
+                buf.write_all(&0xff11d116u32.to_ne_bytes()).unwrap();
+            } else {
+                // AARRGGBB
+                buf.write_all(&0x00000000u32.to_ne_bytes()).unwrap();
+            }
+        }
+    }
+}
+
+impl WaylandInputCapture {
+    pub fn new() -> std::result::Result<Self, LayerShellCaptureCreationError> {
+        let conn = Connection::connect_to_env()?;
+        let (g, mut queue) = registry_queue_init::<State>(&conn)?;
+
+        let qh = queue.handle();
+
+        let compositor: wl_compositor::WlCompositor = g
+            .bind(&qh, 4..=5, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_compositor 4..=5"))?;
+        let xdg_output_manager: ZxdgOutputManagerV1 = g
+            .bind(&qh, 1..=3, ())
+            .map_err(|e| WaylandBindError::new(e, "xdg_output_manager 1..=3"))?;
+        let shm: wl_shm::WlShm = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_shm"))?;
+        let layer_shell: ZwlrLayerShellV1 = g
+            .bind(&qh, 3..=4, ())
+            .map_err(|e| WaylandBindError::new(e, "wlr_layer_shell 3..=4"))?;
+        let seat: wl_seat::WlSeat = g
+            .bind(&qh, 7..=8, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_seat 7..=8"))?;
+
+        let pointer_constraints: ZwpPointerConstraintsV1 = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "zwp_pointer_constraints_v1"))?;
+        let relative_pointer_manager: ZwpRelativePointerManagerV1 = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "zwp_relative_pointer_manager_v1"))?;
+        let shortcut_inhibit_manager: ZwpKeyboardShortcutsInhibitManagerV1 = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "zwp_keyboard_shortcuts_inhibit_manager_v1"))?;
+        let outputs = vec![];
+
+        let g = Globals {
+            compositor,
+            shm,
+            layer_shell,
+            seat,
+            pointer_constraints,
+            relative_pointer_manager,
+            shortcut_inhibit_manager,
+            outputs,
+            xdg_output_manager,
+        };
+
+        // flush outgoing events
+        queue.flush()?;
+
+        // prepare reading wayland events
+        let read_guard = queue.prepare_read().unwrap(); // there can not yet be events to dispatch
+        let wayland_fd = read_guard.connection_fd().try_clone_to_owned().unwrap();
+        std::mem::drop(read_guard);
+
+        let mut state = State {
+            pointer: None,
+            keyboard: None,
+            g,
+            pointer_lock: None,
+            rel_pointer: None,
+            shortcut_inhibitor: None,
+            client_for_window: Vec::new(),
+            focused: None,
+            qh,
+            wayland_fd,
+            read_guard: None,
+            pending_events: VecDeque::new(),
+            output_info: vec![],
+            scroll_discrete_pending: false,
+        };
+
+        // dispatch registry to () again, in order to read all wl_outputs
+        conn.display().get_registry(&state.qh, ());
+        log::debug!("==============> requested registry");
+
+        // roundtrip to read wl_output globals
+        queue.roundtrip(&mut state)?;
+        log::debug!("==============> roundtrip 1 done");
+
+        // read outputs
+        for output in state.g.outputs.iter() {
+            state
+                .g
+                .xdg_output_manager
+                .get_xdg_output(output, &state.qh, output.clone());
+        }
+
+        // roundtrip to read xdg_output events
+        queue.roundtrip(&mut state)?;
+
+        log::debug!("==============> roundtrip 2 done");
+        for i in &state.output_info {
+            log::debug!("{:#?}", i.1);
+        }
+
+        let read_guard = loop {
+            match queue.prepare_read() {
+                Some(r) => break r,
+                None => {
+                    queue.dispatch_pending(&mut state)?;
+                    continue;
+                }
+            }
+        };
+        state.read_guard = Some(read_guard);
+
+        let inner = AsyncFd::new(Inner { queue, state })?;
+
+        Ok(WaylandInputCapture(inner))
+    }
+
+    fn add_client(&mut self, handle: CaptureHandle, pos: Position) {
+        self.0.get_mut().state.add_client(handle, pos);
+    }
+
+    fn delete_client(&mut self, handle: CaptureHandle) {
+        let inner = self.0.get_mut();
+        // remove all windows corresponding to this client
+        while let Some(i) = inner
+            .state
+            .client_for_window
+            .iter()
+            .position(|(_, c)| *c == handle)
+        {
+            inner.state.client_for_window.remove(i);
+            inner.state.focused = None;
+        }
+    }
+}
+
+impl State {
+    fn grab(
+        &mut self,
+        surface: &WlSurface,
+        pointer: &WlPointer,
+        serial: u32,
+        qh: &QueueHandle<State>,
+    ) {
+        let (window, _) = self.focused.as_ref().unwrap();
+
+        // hide the cursor
+        pointer.set_cursor(serial, None, 0, 0);
+
+        // capture input
+        window
+            .layer_surface
+            .set_keyboard_interactivity(KeyboardInteractivity::Exclusive);
+        window.surface.commit();
+
+        // lock pointer
+        if self.pointer_lock.is_none() {
+            self.pointer_lock = Some(self.g.pointer_constraints.lock_pointer(
+                surface,
+                pointer,
+                None,
+                Lifetime::Persistent,
+                qh,
+                (),
+            ));
+        }
+
+        // request relative input
+        if self.rel_pointer.is_none() {
+            self.rel_pointer = Some(self.g.relative_pointer_manager.get_relative_pointer(
+                pointer,
+                qh,
+                (),
+            ));
+        }
+
+        // capture modifier keys
+        if self.shortcut_inhibitor.is_none() {
+            self.shortcut_inhibitor = Some(self.g.shortcut_inhibit_manager.inhibit_shortcuts(
+                surface,
+                &self.g.seat,
+                qh,
+                (),
+            ));
+        }
+    }
+
+    fn ungrab(&mut self) {
+        // get focused client
+        let (window, _client) = match self.focused.as_ref() {
+            Some(focused) => focused,
+            None => return,
+        };
+
+        // ungrab surface
+        window
+            .layer_surface
+            .set_keyboard_interactivity(KeyboardInteractivity::None);
+        window.surface.commit();
+
+        // destroy pointer lock
+        if let Some(pointer_lock) = &self.pointer_lock {
+            pointer_lock.destroy();
+            self.pointer_lock = None;
+        }
+
+        // destroy relative input
+        if let Some(rel_pointer) = &self.rel_pointer {
+            rel_pointer.destroy();
+            self.rel_pointer = None;
+        }
+
+        // destroy shortcut inhibitor
+        if let Some(shortcut_inhibitor) = &self.shortcut_inhibitor {
+            shortcut_inhibitor.destroy();
+            self.shortcut_inhibitor = None;
+        }
+    }
+
+    fn add_client(&mut self, client: CaptureHandle, pos: Position) {
+        let outputs = get_output_configuration(self, pos);
+
+        log::debug!("outputs: {outputs:?}");
+        outputs.iter().for_each(|(o, i)| {
+            let window = Window::new(self, &self.qh, o, pos, i.size);
+            let window = Arc::new(window);
+            self.client_for_window.push((window, client));
+        });
+    }
+
+    fn update_windows(&mut self) {
+        log::debug!("updating windows");
+        log::debug!("output info: {:?}", self.output_info);
+        let clients: Vec<_> = self
+            .client_for_window
+            .drain(..)
+            .map(|(w, c)| (c, w.pos))
+            .collect();
+        for (client, pos) in clients {
+            self.add_client(client, pos);
+        }
+    }
+}
+
+impl Inner {
+    fn read(&mut self) -> bool {
+        match self.state.read_guard.take().unwrap().read() {
+            Ok(_) => true,
+            Err(WaylandError::Io(e)) if e.kind() == ErrorKind::WouldBlock => false,
+            Err(WaylandError::Io(e)) => {
+                log::error!("error reading from wayland socket: {e}");
+                false
+            }
+            Err(WaylandError::Protocol(e)) => {
+                panic!("wayland protocol violation: {e}")
+            }
+        }
+    }
+
+    fn prepare_read(&mut self) -> io::Result<()> {
+        loop {
+            match self.queue.prepare_read() {
+                None => match self.queue.dispatch_pending(&mut self.state) {
+                    Ok(_) => continue,
+                    Err(DispatchError::Backend(WaylandError::Io(e))) => return Err(e),
+                    Err(e) => panic!("failed to dispatch wayland events: {e}"),
+                },
+                Some(r) => {
+                    self.state.read_guard = Some(r);
+                    break Ok(());
+                }
+            }
+        }
+    }
+
+    fn dispatch_events(&mut self) {
+        match self.queue.dispatch_pending(&mut self.state) {
+            Ok(_) => {}
+            Err(DispatchError::Backend(WaylandError::Io(e))) => {
+                log::error!("Wayland Error: {}", e);
+            }
+            Err(DispatchError::Backend(e)) => {
+                panic!("backend error: {}", e);
+            }
+            Err(DispatchError::BadMessage {
+                sender_id,
+                interface,
+                opcode,
+            }) => {
+                panic!("bad message {}, {} , {}", sender_id, interface, opcode);
+            }
+        }
+    }
+
+    fn flush_events(&mut self) -> io::Result<()> {
+        // flush outgoing events
+        match self.queue.flush() {
+            Ok(_) => (),
+            Err(e) => match e {
+                WaylandError::Io(e) => {
+                    return Err(e);
+                }
+                WaylandError::Protocol(e) => {
+                    panic!("wayland protocol violation: {e}")
+                }
+            },
+        }
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl InputCapture for WaylandInputCapture {
+    async fn create(&mut self, handle: CaptureHandle, pos: Position) -> Result<(), CaptureError> {
+        self.add_client(handle, pos);
+        let inner = self.0.get_mut();
+        Ok(inner.flush_events()?)
+    }
+
+    async fn destroy(&mut self, handle: CaptureHandle) -> Result<(), CaptureError> {
+        self.delete_client(handle);
+        let inner = self.0.get_mut();
+        Ok(inner.flush_events()?)
+    }
+
+    async fn release(&mut self) -> Result<(), CaptureError> {
+        log::debug!("releasing pointer");
+        let inner = self.0.get_mut();
+        inner.state.ungrab();
+        Ok(inner.flush_events()?)
+    }
+
+    async fn terminate(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+}
+
+impl Stream for WaylandInputCapture {
+    type Item = Result<(CaptureHandle, Event), CaptureError>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        if let Some(event) = self.0.get_mut().state.pending_events.pop_front() {
+            return Poll::Ready(Some(Ok(event)));
+        }
+
+        loop {
+            let mut guard = ready!(self.0.poll_read_ready_mut(cx))?;
+
+            {
+                let inner = guard.get_inner_mut();
+
+                // read events
+                while inner.read() {
+                    // prepare next read
+                    match inner.prepare_read() {
+                        Ok(_) => {}
+                        Err(e) => return Poll::Ready(Some(Err(e.into()))),
+                    }
+                }
+
+                // dispatch the events
+                inner.dispatch_events();
+
+                // flush outgoing events
+                if let Err(e) = inner.flush_events() {
+                    if e.kind() != ErrorKind::WouldBlock {
+                        return Poll::Ready(Some(Err(e.into())));
+                    }
+                }
+
+                // prepare for the next read
+                match inner.prepare_read() {
+                    Ok(_) => {}
+                    Err(e) => return Poll::Ready(Some(Err(e.into()))),
+                }
+            }
+
+            // clear read readiness for tokio read guard
+            // guard.clear_ready_matching(Ready::READABLE);
+            guard.clear_ready();
+
+            // if an event has been queued during dispatch_events() we return it
+            match guard.get_inner_mut().state.pending_events.pop_front() {
+                Some(event) => return Poll::Ready(Some(Ok(event))),
+                None => continue,
+            }
+        }
+    }
+}
+
+impl Dispatch<wl_seat::WlSeat, ()> for State {
+    fn event(
+        state: &mut Self,
+        seat: &wl_seat::WlSeat,
+        event: <wl_seat::WlSeat as wayland_client::Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        qh: &QueueHandle<Self>,
+    ) {
+        if let wl_seat::Event::Capabilities {
+            capabilities: WEnum::Value(capabilities),
+        } = event
+        {
+            if capabilities.contains(wl_seat::Capability::Pointer) && state.pointer.is_none() {
+                state.pointer.replace(seat.get_pointer(qh, ()));
+            }
+            if capabilities.contains(wl_seat::Capability::Keyboard) && state.keyboard.is_none() {
+                seat.get_keyboard(qh, ());
+            }
+        }
+    }
+}
+
+impl Dispatch<WlPointer, ()> for State {
+    fn event(
+        app: &mut Self,
+        pointer: &WlPointer,
+        event: <WlPointer as wayland_client::Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        qh: &QueueHandle<Self>,
+    ) {
+        match event {
+            wl_pointer::Event::Enter {
+                serial,
+                surface,
+                surface_x: _,
+                surface_y: _,
+            } => {
+                // get client corresponding to the focused surface
+                {
+                    if let Some((window, client)) = app
+                        .client_for_window
+                        .iter()
+                        .find(|(w, _c)| w.surface == surface)
+                    {
+                        app.focused = Some((window.clone(), *client));
+                        app.grab(&surface, pointer, serial, qh);
+                    } else {
+                        return;
+                    }
+                }
+                let (_, client) = app
+                    .client_for_window
+                    .iter()
+                    .find(|(w, _c)| w.surface == surface)
+                    .unwrap();
+                app.pending_events.push_back((*client, Event::Enter()));
+            }
+            wl_pointer::Event::Leave { .. } => {
+                /* There are rare cases, where when a window is opened in
+                 * just the wrong moment, the pointer is released, while
+                 * still grabbed.
+                 * In that case, the pointer must be ungrabbed, otherwise
+                 * it is impossible to grab it again (since the pointer
+                 * lock, relative pointer,... objects are still in place)
+                 */
+                if app.pointer_lock.is_some() {
+                    log::warn!("compositor released mouse");
+                }
+                app.ungrab();
+            }
+            wl_pointer::Event::Button {
+                serial: _,
+                time,
+                button,
+                state,
+            } => {
+                let (_, client) = app.focused.as_ref().unwrap();
+                app.pending_events.push_back((
+                    *client,
+                    Event::Pointer(PointerEvent::Button {
+                        time,
+                        button,
+                        state: u32::from(state),
+                    }),
+                ));
+            }
+            wl_pointer::Event::Axis { time, axis, value } => {
+                let (_, client) = app.focused.as_ref().unwrap();
+                if app.scroll_discrete_pending {
+                    // each axisvalue120 event is coupled with
+                    // a corresponding axis event, which needs to
+                    // be ignored to not duplicate the scrolling
+                    app.scroll_discrete_pending = false;
+                } else {
+                    app.pending_events.push_back((
+                        *client,
+                        Event::Pointer(PointerEvent::Axis {
+                            time,
+                            axis: u32::from(axis) as u8,
+                            value,
+                        }),
+                    ));
+                }
+            }
+            wl_pointer::Event::AxisValue120 { axis, value120 } => {
+                let (_, client) = app.focused.as_ref().unwrap();
+                app.scroll_discrete_pending = true;
+                app.pending_events.push_back((
+                    *client,
+                    Event::Pointer(PointerEvent::AxisDiscrete120 {
+                        axis: u32::from(axis) as u8,
+                        value: value120,
+                    }),
+                ));
+            }
+            wl_pointer::Event::Frame {} => {
+                // TODO properly handle frame events
+                // we simply insert a frame event on the client side
+                // after each event for now
+            }
+            _ => {}
+        }
+    }
+}
+
+impl Dispatch<WlKeyboard, ()> for State {
+    fn event(
+        app: &mut Self,
+        _: &WlKeyboard,
+        event: wl_keyboard::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        let (_window, client) = match &app.focused {
+            Some(focused) => (Some(&focused.0), Some(&focused.1)),
+            None => (None, None),
+        };
+        match event {
+            wl_keyboard::Event::Key {
+                serial: _,
+                time,
+                key,
+                state,
+            } => {
+                if let Some(client) = client {
+                    app.pending_events.push_back((
+                        *client,
+                        Event::Keyboard(KeyboardEvent::Key {
+                            time,
+                            key,
+                            state: u32::from(state) as u8,
+                        }),
+                    ));
+                }
+            }
+            wl_keyboard::Event::Modifiers {
+                serial: _,
+                mods_depressed,
+                mods_latched,
+                mods_locked,
+                group,
+            } => {
+                if let Some(client) = client {
+                    app.pending_events.push_back((
+                        *client,
+                        Event::Keyboard(KeyboardEvent::Modifiers {
+                            mods_depressed,
+                            mods_latched,
+                            mods_locked,
+                            group,
+                        }),
+                    ));
+                }
+            }
+            wl_keyboard::Event::Keymap {
+                format: _,
+                fd,
+                size: _,
+            } => {
+                let fd = unsafe { &File::from_raw_fd(fd.as_raw_fd()) };
+                let _mmap = unsafe { MmapOptions::new().map_copy(fd).unwrap() };
+                // TODO keymap
+            }
+            _ => (),
+        }
+    }
+}
+
+impl Dispatch<ZwpRelativePointerV1, ()> for State {
+    fn event(
+        app: &mut Self,
+        _: &ZwpRelativePointerV1,
+        event: <ZwpRelativePointerV1 as wayland_client::Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        if let zwp_relative_pointer_v1::Event::RelativeMotion {
+            utime_hi,
+            utime_lo,
+            dx_unaccel: dx,
+            dy_unaccel: dy,
+            ..
+        } = event
+        {
+            if let Some((_window, client)) = &app.focused {
+                let time = (((utime_hi as u64) << 32 | utime_lo as u64) / 1000) as u32;
+                app.pending_events.push_back((
+                    *client,
+                    Event::Pointer(PointerEvent::Motion { time, dx, dy }),
+                ));
+            }
+        }
+    }
+}
+
+impl Dispatch<ZwlrLayerSurfaceV1, ()> for State {
+    fn event(
+        app: &mut Self,
+        layer_surface: &ZwlrLayerSurfaceV1,
+        event: <ZwlrLayerSurfaceV1 as wayland_client::Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        if let zwlr_layer_surface_v1::Event::Configure { serial, .. } = event {
+            if let Some((window, _client)) = app
+                .client_for_window
+                .iter()
+                .find(|(w, _c)| &w.layer_surface == layer_surface)
+            {
+                // client corresponding to the layer_surface
+                let surface = &window.surface;
+                let buffer = &window.buffer;
+                surface.attach(Some(buffer), 0, 0);
+                layer_surface.ack_configure(serial);
+                surface.commit();
+            }
+        }
+    }
+}
+
+// delegate wl_registry events to App itself
+impl Dispatch<wl_registry::WlRegistry, GlobalListContents> for State {
+    fn event(
+        _state: &mut Self,
+        _proxy: &wl_registry::WlRegistry,
+        _event: <wl_registry::WlRegistry as wayland_client::Proxy>::Event,
+        _data: &GlobalListContents,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<Self>,
+    ) {
+    }
+}
+
+impl Dispatch<wl_registry::WlRegistry, ()> for State {
+    fn event(
+        state: &mut Self,
+        registry: &wl_registry::WlRegistry,
+        event: <wl_registry::WlRegistry as wayland_client::Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        qh: &QueueHandle<Self>,
+    ) {
+        match event {
+            wl_registry::Event::Global {
+                name,
+                interface,
+                version: _,
+            } => {
+                if interface.as_str() == "wl_output" {
+                    log::debug!("wl_output global");
+                    state
+                        .g
+                        .outputs
+                        .push(registry.bind::<WlOutput, _, _>(name, 4, qh, ()))
+                }
+            }
+            wl_registry::Event::GlobalRemove { .. } => {}
+            _ => {}
+        }
+    }
+}
+
+impl Dispatch<ZxdgOutputV1, WlOutput> for State {
+    fn event(
+        state: &mut Self,
+        _: &ZxdgOutputV1,
+        event: <ZxdgOutputV1 as wayland_client::Proxy>::Event,
+        wl_output: &WlOutput,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        log::debug!("xdg-output - {event:?}");
+        let output_info = match state.output_info.iter_mut().find(|(o, _)| o == wl_output) {
+            Some((_, c)) => c,
+            None => {
+                let output_info = OutputInfo::new();
+                state.output_info.push((wl_output.clone(), output_info));
+                &mut state.output_info.last_mut().unwrap().1
+            }
+        };
+
+        match event {
+            zxdg_output_v1::Event::LogicalPosition { x, y } => {
+                output_info.position = (x, y);
+            }
+            zxdg_output_v1::Event::LogicalSize { width, height } => {
+                output_info.size = (width, height);
+            }
+            zxdg_output_v1::Event::Done => {}
+            zxdg_output_v1::Event::Name { name } => {
+                output_info.name = name;
+            }
+            zxdg_output_v1::Event::Description { .. } => {}
+            _ => {}
+        }
+    }
+}
+
+impl Dispatch<WlOutput, ()> for State {
+    fn event(
+        state: &mut Self,
+        _proxy: &WlOutput,
+        event: <WlOutput as wayland_client::Proxy>::Event,
+        _data: &(),
+        _conn: &Connection,
+        _qhandle: &QueueHandle<Self>,
+    ) {
+        if let wl_output::Event::Done = event {
+            state.update_windows();
+        }
+    }
+}
+
+// don't emit any events
+delegate_noop!(State: wl_region::WlRegion);
+delegate_noop!(State: wl_shm_pool::WlShmPool);
+delegate_noop!(State: wl_compositor::WlCompositor);
+delegate_noop!(State: ZwlrLayerShellV1);
+delegate_noop!(State: ZwpRelativePointerManagerV1);
+delegate_noop!(State: ZwpKeyboardShortcutsInhibitManagerV1);
+delegate_noop!(State: ZwpPointerConstraintsV1);
+
+// ignore events
+delegate_noop!(State: ignore ZxdgOutputManagerV1);
+delegate_noop!(State: ignore wl_shm::WlShm);
+delegate_noop!(State: ignore wl_buffer::WlBuffer);
+delegate_noop!(State: ignore WlSurface);
+delegate_noop!(State: ignore ZwpKeyboardShortcutsInhibitorV1);
+delegate_noop!(State: ignore ZwpLockedPointerV1);

input-capture/src/windows.rs

@@ -0,0 +1,631 @@
+use async_trait::async_trait;
+use core::task::{Context, Poll};
+use futures::Stream;
+use once_cell::unsync::Lazy;
+
+use std::collections::HashMap;
+use std::ptr::{addr_of, addr_of_mut};
+
+use futures::executor::block_on;
+use std::default::Default;
+use std::sync::atomic::{AtomicU32, Ordering};
+use std::sync::{mpsc, Mutex};
+use std::task::ready;
+use std::{pin::Pin, thread};
+use tokio::sync::mpsc::{channel, Receiver, Sender};
+use windows::core::{w, PCWSTR};
+use windows::Win32::Foundation::{FALSE, HINSTANCE, HWND, LPARAM, LRESULT, RECT, WPARAM};
+use windows::Win32::Graphics::Gdi::{
+    EnumDisplayDevicesW, EnumDisplaySettingsW, DEVMODEW, DISPLAY_DEVICEW,
+    DISPLAY_DEVICE_ATTACHED_TO_DESKTOP, ENUM_CURRENT_SETTINGS,
+};
+use windows::Win32::System::LibraryLoader::GetModuleHandleW;
+use windows::Win32::System::Threading::GetCurrentThreadId;
+
+use windows::Win32::UI::WindowsAndMessaging::{
+    CallNextHookEx, CreateWindowExW, DispatchMessageW, GetMessageW, PostThreadMessageW,
+    RegisterClassW, SetWindowsHookExW, TranslateMessage, EDD_GET_DEVICE_INTERFACE_NAME, HHOOK,
+    HMENU, HOOKPROC, KBDLLHOOKSTRUCT, LLKHF_EXTENDED, MSG, MSLLHOOKSTRUCT, WH_KEYBOARD_LL,
+    WH_MOUSE_LL, WINDOW_STYLE, WM_DISPLAYCHANGE, WM_KEYDOWN, WM_KEYUP, WM_LBUTTONDOWN,
+    WM_LBUTTONUP, WM_MBUTTONDOWN, WM_MBUTTONUP, WM_MOUSEMOVE, WM_MOUSEWHEEL, WM_RBUTTONDOWN,
+    WM_RBUTTONUP, WM_SYSKEYDOWN, WM_SYSKEYUP, WM_USER, WM_XBUTTONDOWN, WM_XBUTTONUP, WNDCLASSW,
+    WNDPROC,
+};
+
+use input_event::{
+    scancode::{self, Linux},
+    Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
+};
+
+use super::{CaptureError, CaptureHandle, InputCapture, Position};
+
+enum Request {
+    Create(CaptureHandle, Position),
+    Destroy(CaptureHandle),
+}
+
+pub struct WindowsInputCapture {
+    event_rx: Receiver<(CaptureHandle, Event)>,
+    msg_thread: Option<std::thread::JoinHandle<()>>,
+}
+
+enum EventType {
+    Request = 0,
+    Release = 1,
+    Exit = 2,
+}
+
+unsafe fn signal_message_thread(event_type: EventType) {
+    if let Some(event_tid) = get_event_tid() {
+        PostThreadMessageW(event_tid, WM_USER, WPARAM(event_type as usize), LPARAM(0)).unwrap();
+    } else {
+        panic!();
+    }
+}
+
+#[async_trait]
+impl InputCapture for WindowsInputCapture {
+    async fn create(&mut self, handle: CaptureHandle, pos: Position) -> Result<(), CaptureError> {
+        unsafe {
+            {
+                let mut requests = REQUEST_BUFFER.lock().unwrap();
+                requests.push(Request::Create(handle, pos));
+            }
+            signal_message_thread(EventType::Request);
+        }
+        Ok(())
+    }
+
+    async fn destroy(&mut self, handle: CaptureHandle) -> Result<(), CaptureError> {
+        unsafe {
+            {
+                let mut requests = REQUEST_BUFFER.lock().unwrap();
+                requests.push(Request::Destroy(handle));
+            }
+            signal_message_thread(EventType::Request);
+        }
+        Ok(())
+    }
+
+    async fn release(&mut self) -> Result<(), CaptureError> {
+        unsafe { signal_message_thread(EventType::Release) };
+        Ok(())
+    }
+
+    async fn terminate(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+}
+
+static mut REQUEST_BUFFER: Mutex<Vec<Request>> = Mutex::new(Vec::new());
+static mut ACTIVE_CLIENT: Option<CaptureHandle> = None;
+static mut CLIENT_FOR_POS: Lazy<HashMap<Position, CaptureHandle>> = Lazy::new(HashMap::new);
+static mut EVENT_TX: Option<Sender<(CaptureHandle, Event)>> = None;
+static mut EVENT_THREAD_ID: AtomicU32 = AtomicU32::new(0);
+unsafe fn set_event_tid(tid: u32) {
+    EVENT_THREAD_ID.store(tid, Ordering::SeqCst);
+}
+unsafe fn get_event_tid() -> Option<u32> {
+    match EVENT_THREAD_ID.load(Ordering::SeqCst) {
+        0 => None,
+        id => Some(id),
+    }
+}
+
+static mut ENTRY_POINT: (i32, i32) = (0, 0);
+
+fn to_mouse_event(wparam: WPARAM, lparam: LPARAM) -> Option<PointerEvent> {
+    let mouse_low_level: MSLLHOOKSTRUCT = unsafe { *(lparam.0 as *const MSLLHOOKSTRUCT) };
+    match wparam {
+        WPARAM(p) if p == WM_LBUTTONDOWN as usize => Some(PointerEvent::Button {
+            time: 0,
+            button: BTN_LEFT,
+            state: 1,
+        }),
+        WPARAM(p) if p == WM_MBUTTONDOWN as usize => Some(PointerEvent::Button {
+            time: 0,
+            button: BTN_MIDDLE,
+            state: 1,
+        }),
+        WPARAM(p) if p == WM_RBUTTONDOWN as usize => Some(PointerEvent::Button {
+            time: 0,
+            button: BTN_RIGHT,
+            state: 1,
+        }),
+        WPARAM(p) if p == WM_LBUTTONUP as usize => Some(PointerEvent::Button {
+            time: 0,
+            button: BTN_LEFT,
+            state: 0,
+        }),
+        WPARAM(p) if p == WM_MBUTTONUP as usize => Some(PointerEvent::Button {
+            time: 0,
+            button: BTN_MIDDLE,
+            state: 0,
+        }),
+        WPARAM(p) if p == WM_RBUTTONUP as usize => Some(PointerEvent::Button {
+            time: 0,
+            button: BTN_RIGHT,
+            state: 0,
+        }),
+        WPARAM(p) if p == WM_MOUSEMOVE as usize => unsafe {
+            let (x, y) = (mouse_low_level.pt.x, mouse_low_level.pt.y);
+            let (ex, ey) = ENTRY_POINT;
+            let (dx, dy) = (x - ex, y - ey);
+            let (dx, dy) = (dx as f64, dy as f64);
+            Some(PointerEvent::Motion { time: 0, dx, dy })
+        },
+        WPARAM(p) if p == WM_MOUSEWHEEL as usize => Some(PointerEvent::AxisDiscrete120 {
+            axis: 0,
+            value: -(mouse_low_level.mouseData as i32 >> 16),
+        }),
+        WPARAM(p) if p == WM_XBUTTONDOWN as usize || p == WM_XBUTTONUP as usize => {
+            let hb = mouse_low_level.mouseData >> 16;
+            let button = match hb {
+                1 => BTN_BACK,
+                2 => BTN_FORWARD,
+                _ => {
+                    log::warn!("unknown mouse button");
+                    return None;
+                }
+            };
+            Some(PointerEvent::Button {
+                time: 0,
+                button,
+                state: if p == WM_XBUTTONDOWN as usize { 1 } else { 0 },
+            })
+        }
+        w => {
+            log::warn!("unknown mouse event: {w:?}");
+            None
+        }
+    }
+}
+
+unsafe fn to_key_event(wparam: WPARAM, lparam: LPARAM) -> Option<KeyboardEvent> {
+    let kybrdllhookstruct: KBDLLHOOKSTRUCT = *(lparam.0 as *const KBDLLHOOKSTRUCT);
+    let mut scan_code = kybrdllhookstruct.scanCode;
+    log::trace!("scan_code: {scan_code}");
+    if kybrdllhookstruct.flags.contains(LLKHF_EXTENDED) {
+        scan_code |= 0xE000;
+    }
+    let Ok(win_scan_code) = scancode::Windows::try_from(scan_code) else {
+        log::warn!("failed to translate to windows scancode: {scan_code}");
+        return None;
+    };
+    log::trace!("windows_scan: {win_scan_code:?}");
+    let Ok(linux_scan_code): Result<Linux, ()> = win_scan_code.try_into() else {
+        log::warn!("failed to translate into linux scancode: {win_scan_code:?}");
+        return None;
+    };
+    log::trace!("windows_scan: {linux_scan_code:?}");
+    let scan_code = linux_scan_code as u32;
+    match wparam {
+        WPARAM(p) if p == WM_KEYDOWN as usize => Some(KeyboardEvent::Key {
+            time: 0,
+            key: scan_code,
+            state: 1,
+        }),
+        WPARAM(p) if p == WM_KEYUP as usize => Some(KeyboardEvent::Key {
+            time: 0,
+            key: scan_code,
+            state: 0,
+        }),
+        WPARAM(p) if p == WM_SYSKEYDOWN as usize => Some(KeyboardEvent::Key {
+            time: 0,
+            key: scan_code,
+            state: 1,
+        }),
+        WPARAM(p) if p == WM_SYSKEYUP as usize => Some(KeyboardEvent::Key {
+            time: 0,
+            key: scan_code,
+            state: 1,
+        }),
+        _ => None,
+    }
+}
+
+///
+/// clamp point to display bounds
+///
+/// # Arguments
+///
+/// * `prev_point`: coordinates, the cursor was before entering, within bounds of a display
+/// * `entry_point`: point to clamp
+///
+/// returns: (i32, i32), the corrected entry point
+///
+fn clamp_to_display_bounds(prev_point: (i32, i32), point: (i32, i32)) -> (i32, i32) {
+    /* find display where movement came from */
+    let display_regions = unsafe { get_display_regions() };
+    let display = display_regions
+        .iter()
+        .find(|&d| is_within_dp_region(prev_point, d))
+        .unwrap();
+
+    /* clamp to bounds (inclusive) */
+    let (x, y) = point;
+    let (min_x, max_x) = (display.left, display.right - 1);
+    let (min_y, max_y) = (display.top, display.bottom - 1);
+    (x.clamp(min_x, max_x), y.clamp(min_y, max_y))
+}
+
+unsafe fn send_blocking(event: Event) {
+    if let Some(active) = ACTIVE_CLIENT {
+        block_on(async move {
+            let _ = EVENT_TX.as_ref().unwrap().send((active, event)).await;
+        });
+    }
+}
+
+unsafe fn check_client_activation(wparam: WPARAM, lparam: LPARAM) -> bool {
+    if wparam.0 != WM_MOUSEMOVE as usize {
+        return ACTIVE_CLIENT.is_some();
+    }
+    let mouse_low_level: MSLLHOOKSTRUCT = *(lparam.0 as *const MSLLHOOKSTRUCT);
+    static mut PREV_POS: Option<(i32, i32)> = None;
+    let curr_pos = (mouse_low_level.pt.x, mouse_low_level.pt.y);
+    let prev_pos = PREV_POS.unwrap_or(curr_pos);
+    PREV_POS.replace(curr_pos);
+
+    /* next event is the first actual event */
+    let ret = ACTIVE_CLIENT.is_some();
+
+    /* client already active, no need to check */
+    if ACTIVE_CLIENT.is_some() {
+        return ret;
+    }
+
+    /* check if a client was activated */
+    let Some(pos) = entered_barrier(prev_pos, curr_pos, get_display_regions()) else {
+        return ret;
+    };
+
+    /* check if a client is registered for the barrier */
+    let Some(client) = CLIENT_FOR_POS.get(&pos) else {
+        return ret;
+    };
+
+    /* update active client and entry point */
+    ACTIVE_CLIENT.replace(*client);
+    ENTRY_POINT = clamp_to_display_bounds(prev_pos, curr_pos);
+
+    /* notify main thread */
+    log::debug!("ENTERED @ {prev_pos:?} -> {curr_pos:?}");
+    send_blocking(Event::Enter());
+
+    ret
+}
+
+unsafe extern "system" fn mouse_proc(ncode: i32, wparam: WPARAM, lparam: LPARAM) -> LRESULT {
+    let active = check_client_activation(wparam, lparam);
+
+    /* no client was active */
+    if !active {
+        return CallNextHookEx(HHOOK::default(), ncode, wparam, lparam);
+    }
+
+    /* get active client if any */
+    let Some(client) = ACTIVE_CLIENT else {
+        return LRESULT(1);
+    };
+
+    /* convert to lan-mouse event */
+    let Some(pointer_event) = to_mouse_event(wparam, lparam) else {
+        return LRESULT(1);
+    };
+    let event = (client, Event::Pointer(pointer_event));
+
+    /* notify mainthread (drop events if sending too fast) */
+    if let Err(e) = EVENT_TX.as_ref().unwrap().try_send(event) {
+        log::warn!("e: {e}");
+    }
+
+    /* don't pass event to applications */
+    LRESULT(1)
+}
+
+unsafe extern "system" fn kybrd_proc(ncode: i32, wparam: WPARAM, lparam: LPARAM) -> LRESULT {
+    /* get active client if any */
+    let Some(client) = ACTIVE_CLIENT else {
+        return CallNextHookEx(HHOOK::default(), ncode, wparam, lparam);
+    };
+
+    /* convert to key event */
+    let Some(key_event) = to_key_event(wparam, lparam) else {
+        return LRESULT(1);
+    };
+    let event = (client, Event::Keyboard(key_event));
+
+    if let Err(e) = EVENT_TX.as_ref().unwrap().try_send(event) {
+        log::warn!("e: {e}");
+    }
+
+    /* don't pass event to applications */
+    LRESULT(1)
+}
+
+unsafe extern "system" fn window_proc(
+    _hwnd: HWND,
+    uint: u32,
+    _wparam: WPARAM,
+    _lparam: LPARAM,
+) -> LRESULT {
+    match uint {
+        x if x == WM_DISPLAYCHANGE => {
+            log::debug!("display resolution changed");
+            DISPLAY_RESOLUTION_CHANGED = true;
+        }
+        _ => {}
+    }
+    LRESULT(1)
+}
+
+fn enumerate_displays() -> Vec<RECT> {
+    unsafe {
+        let mut display_rects = vec![];
+        let mut devices = vec![];
+        for i in 0.. {
+            let mut device: DISPLAY_DEVICEW = std::mem::zeroed();
+            device.cb = std::mem::size_of::<DISPLAY_DEVICEW>() as u32;
+            let ret = EnumDisplayDevicesW(None, i, &mut device, EDD_GET_DEVICE_INTERFACE_NAME);
+            if ret == FALSE {
+                break;
+            }
+            if device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP != 0 {
+                devices.push(device.DeviceName);
+            }
+        }
+        for device in devices {
+            let mut dev_mode: DEVMODEW = std::mem::zeroed();
+            dev_mode.dmSize = std::mem::size_of::<DEVMODEW>() as u16;
+            let ret = EnumDisplaySettingsW(
+                PCWSTR::from_raw(&device as *const _),
+                ENUM_CURRENT_SETTINGS,
+                &mut dev_mode,
+            );
+            if ret == FALSE {
+                log::warn!("no display mode");
+            }
+
+            let pos = dev_mode.Anonymous1.Anonymous2.dmPosition;
+            let (x, y) = (pos.x, pos.y);
+            let (width, height) = (dev_mode.dmPelsWidth, dev_mode.dmPelsHeight);
+
+            display_rects.push(RECT {
+                left: x,
+                right: x + width as i32,
+                top: y,
+                bottom: y + height as i32,
+            });
+        }
+        display_rects
+    }
+}
+
+static mut DISPLAY_RESOLUTION_CHANGED: bool = true;
+
+unsafe fn get_display_regions() -> &'static Vec<RECT> {
+    static mut DISPLAYS: Vec<RECT> = vec![];
+    if DISPLAY_RESOLUTION_CHANGED {
+        DISPLAYS = enumerate_displays();
+        DISPLAY_RESOLUTION_CHANGED = false;
+        log::debug!("displays: {DISPLAYS:?}");
+    }
+    &*addr_of!(DISPLAYS)
+}
+
+fn is_within_dp_region(point: (i32, i32), display: &RECT) -> bool {
+    [
+        Position::Left,
+        Position::Right,
+        Position::Top,
+        Position::Bottom,
+    ]
+    .iter()
+    .all(|&pos| is_within_dp_boundary(point, display, pos))
+}
+fn is_within_dp_boundary(point: (i32, i32), display: &RECT, pos: Position) -> bool {
+    let (x, y) = point;
+    match pos {
+        Position::Left => display.left <= x,
+        Position::Right => display.right > x,
+        Position::Top => display.top <= y,
+        Position::Bottom => display.bottom > y,
+    }
+}
+
+/// returns whether the given position is within the display bounds with respect to the given
+/// barrier position
+///
+/// # Arguments
+///
+/// * `x`:
+/// * `y`:
+/// * `displays`:
+/// * `pos`:
+///
+/// returns: bool
+///
+fn in_bounds(point: (i32, i32), displays: &[RECT], pos: Position) -> bool {
+    displays
+        .iter()
+        .any(|d| is_within_dp_boundary(point, d, pos))
+}
+
+fn in_display_region(point: (i32, i32), displays: &[RECT]) -> bool {
+    displays.iter().any(|d| is_within_dp_region(point, d))
+}
+
+fn moved_across_boundary(
+    prev_pos: (i32, i32),
+    curr_pos: (i32, i32),
+    displays: &[RECT],
+    pos: Position,
+) -> bool {
+    /* was within bounds, but is not anymore */
+    in_display_region(prev_pos, displays) && !in_bounds(curr_pos, displays, pos)
+}
+
+fn entered_barrier(
+    prev_pos: (i32, i32),
+    curr_pos: (i32, i32),
+    displays: &[RECT],
+) -> Option<Position> {
+    [
+        Position::Left,
+        Position::Right,
+        Position::Top,
+        Position::Bottom,
+    ]
+    .into_iter()
+    .find(|&pos| moved_across_boundary(prev_pos, curr_pos, displays, pos))
+}
+
+fn get_msg() -> Option<MSG> {
+    unsafe {
+        let mut msg = std::mem::zeroed();
+        let ret = GetMessageW(addr_of_mut!(msg), HWND::default(), 0, 0);
+        match ret.0 {
+            0 => None,
+            x if x > 0 => Some(msg),
+            _ => panic!("error in GetMessageW"),
+        }
+    }
+}
+
+fn message_thread(ready_tx: mpsc::Sender<()>) {
+    unsafe {
+        set_event_tid(GetCurrentThreadId());
+        ready_tx.send(()).expect("channel closed");
+        let mouse_proc: HOOKPROC = Some(mouse_proc);
+        let kybrd_proc: HOOKPROC = Some(kybrd_proc);
+        let window_proc: WNDPROC = Some(window_proc);
+
+        /* register hooks */
+        let _ = SetWindowsHookExW(WH_MOUSE_LL, mouse_proc, HINSTANCE::default(), 0).unwrap();
+        let _ = SetWindowsHookExW(WH_KEYBOARD_LL, kybrd_proc, HINSTANCE::default(), 0).unwrap();
+
+        let instance = GetModuleHandleW(None).unwrap();
+        let window_class: WNDCLASSW = WNDCLASSW {
+            lpfnWndProc: window_proc,
+            hInstance: instance.into(),
+            lpszClassName: w!("lan-mouse-message-window-class"),
+            ..Default::default()
+        };
+
+        let ret = RegisterClassW(&window_class);
+        if ret == 0 {
+            panic!("RegisterClassW");
+        }
+
+        /* window is used ro receive WM_DISPLAYCHANGE messages */
+        CreateWindowExW(
+            Default::default(),
+            w!("lan-mouse-message-window-class"),
+            w!("lan-mouse-msg-window"),
+            WINDOW_STYLE::default(),
+            0,
+            0,
+            0,
+            0,
+            HWND::default(),
+            HMENU::default(),
+            instance,
+            None,
+        )
+        .expect("CreateWindowExW");
+
+        /* run message loop */
+        loop {
+            // mouse / keybrd proc do not actually return a message
+            let Some(msg) = get_msg() else {
+                break;
+            };
+            if msg.hwnd.0.is_null() {
+                /* messages sent via PostThreadMessage */
+                match msg.wParam.0 {
+                    x if x == EventType::Exit as usize => break,
+                    x if x == EventType::Release as usize => {
+                        ACTIVE_CLIENT.take();
+                    }
+                    x if x == EventType::Request as usize => {
+                        let requests = {
+                            let mut res = vec![];
+                            let mut requests = REQUEST_BUFFER.lock().unwrap();
+                            for request in requests.drain(..) {
+                                res.push(request);
+                            }
+                            res
+                        };
+
+                        for request in requests {
+                            update_clients(request)
+                        }
+                    }
+                    _ => {}
+                }
+            } else {
+                /* other messages for window_procs */
+                let _ = TranslateMessage(&msg);
+                DispatchMessageW(&msg);
+            }
+        }
+    }
+}
+
+fn update_clients(request: Request) {
+    match request {
+        Request::Create(handle, pos) => {
+            unsafe { CLIENT_FOR_POS.insert(pos, handle) };
+        }
+        Request::Destroy(handle) => unsafe {
+            for pos in [
+                Position::Left,
+                Position::Right,
+                Position::Top,
+                Position::Bottom,
+            ] {
+                if ACTIVE_CLIENT == Some(handle) {
+                    ACTIVE_CLIENT.take();
+                }
+                if CLIENT_FOR_POS.get(&pos).copied() == Some(handle) {
+                    CLIENT_FOR_POS.remove(&pos);
+                }
+            }
+        },
+    }
+}
+
+impl WindowsInputCapture {
+    pub(crate) fn new() -> Self {
+        unsafe {
+            let (tx, rx) = channel(10);
+            EVENT_TX.replace(tx);
+            let (ready_tx, ready_rx) = mpsc::channel();
+            let msg_thread = Some(thread::spawn(|| message_thread(ready_tx)));
+            /* wait for thread to set its id */
+            ready_rx.recv().expect("channel closed");
+            Self {
+                msg_thread,
+                event_rx: rx,
+            }
+        }
+    }
+}
+
+impl Stream for WindowsInputCapture {
+    type Item = Result<(CaptureHandle, Event), CaptureError>;
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        match ready!(self.event_rx.poll_recv(cx)) {
+            None => Poll::Ready(None),
+            Some(e) => Poll::Ready(Some(Ok(e))),
+        }
+    }
+}
+
+impl Drop for WindowsInputCapture {
+    fn drop(&mut self) {
+        unsafe { signal_message_thread(EventType::Exit) };
+        let _ = self.msg_thread.take().unwrap().join();
+    }
+}

input-capture/src/x11.rs

@@ -0,0 +1,50 @@
+use std::task::Poll;
+
+use async_trait::async_trait;
+use futures_core::Stream;
+
+use crate::CaptureError;
+
+use super::InputCapture;
+use input_event::Event;
+
+use super::error::X11InputCaptureCreationError;
+use super::{CaptureHandle, Position};
+
+pub struct X11InputCapture {}
+
+impl X11InputCapture {
+    pub fn new() -> std::result::Result<Self, X11InputCaptureCreationError> {
+        Err(X11InputCaptureCreationError::NotImplemented)
+    }
+}
+
+#[async_trait]
+impl InputCapture for X11InputCapture {
+    async fn create(&mut self, _id: CaptureHandle, _pos: Position) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn destroy(&mut self, _id: CaptureHandle) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn release(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+
+    async fn terminate(&mut self) -> Result<(), CaptureError> {
+        Ok(())
+    }
+}
+
+impl Stream for X11InputCapture {
+    type Item = Result<(CaptureHandle, Event), CaptureError>;
+
+    fn poll_next(
+        self: std::pin::Pin<&mut Self>,
+        _cx: &mut std::task::Context<'_>,
+    ) -> std::task::Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}

input-emulation/Cargo.toml

@@ -0,0 +1,71 @@
+[package]
+name = "input-emulation"
+description = "cross-platform input emulation library used by lan-mouse"
+version = "0.1.0"
+edition = "2021"
+license = "GPL-3.0-or-later"
+repository = "https://github.com/feschber/lan-mouse"
+
+[dependencies]
+async-trait = "0.1.80"
+futures = "0.3.28"
+log = "0.4.22"
+input-event = { path = "../input-event", version = "0.2.1" }
+thiserror = "1.0.61"
+tokio = { version = "1.32.0", features = [
+    "io-util",
+    "io-std",
+    "macros",
+    "net",
+    "process",
+    "rt",
+    "sync",
+    "signal",
+] }
+once_cell = "1.19.0"
+
+[target.'cfg(all(unix, not(target_os="macos")))'.dependencies]
+wayland-client = { version = "0.31.1", optional = true }
+wayland-protocols = { version = "0.32.1", features = [
+    "client",
+    "staging",
+    "unstable",
+], optional = true }
+wayland-protocols-wlr = { version = "0.3.1", features = [
+    "client",
+], optional = true }
+wayland-protocols-misc = { version = "0.3.1", features = [
+    "client",
+], optional = true }
+x11 = { version = "2.21.0", features = ["xlib", "xtest"], optional = true }
+ashpd = { version = "0.9", default-features = false, features = [
+    "tokio",
+], optional = true }
+reis = { version = "0.2", features = ["tokio"], optional = true }
+
+[target.'cfg(target_os="macos")'.dependencies]
+core-graphics = { version = "0.23", features = ["highsierra"] }
+keycode = "0.4.0"
+
+[target.'cfg(windows)'.dependencies]
+windows = { version = "0.58.0", features = [
+    "Win32_System_LibraryLoader",
+    "Win32_System_Threading",
+    "Win32_Foundation",
+    "Win32_Graphics",
+    "Win32_Graphics_Gdi",
+    "Win32_UI_Input_KeyboardAndMouse",
+    "Win32_UI_WindowsAndMessaging",
+] }
+
+[features]
+default = ["wayland", "x11", "xdg_desktop_portal", "libei"]
+wayland = [
+    "dep:wayland-client",
+    "dep:wayland-protocols",
+    "dep:wayland-protocols-wlr",
+    "dep:wayland-protocols-misc",
+]
+x11 = ["dep:x11"]
+xdg_desktop_portal = ["dep:ashpd"]
+libei = ["dep:reis", "dep:ashpd"]

input-emulation/src/dummy.rs

@@ -0,0 +1,32 @@
+use async_trait::async_trait;
+use input_event::Event;
+
+use crate::error::EmulationError;
+
+use super::{EmulationHandle, InputEmulation};
+
+#[derive(Default)]
+pub struct DummyEmulation;
+
+impl DummyEmulation {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+#[async_trait]
+impl InputEmulation for DummyEmulation {
+    async fn consume(
+        &mut self,
+        event: Event,
+        client_handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        log::info!("received event: ({client_handle}) {event}");
+        Ok(())
+    }
+    async fn create(&mut self, _: EmulationHandle) {}
+    async fn destroy(&mut self, _: EmulationHandle) {}
+    async fn terminate(&mut self) {
+        /* nothing to do */
+    }
+}

input-emulation/src/error.rs

@@ -0,0 +1,179 @@
+#[derive(Debug, Error)]
+pub enum InputEmulationError {
+    #[error("error creating input-emulation: `{0}`")]
+    Create(#[from] EmulationCreationError),
+    #[error("error emulating input: `{0}`")]
+    Emulate(#[from] EmulationError),
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use ashpd::{desktop::ResponseError, Error::Response};
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use reis::tokio::EiConvertEventStreamError;
+use std::io;
+use thiserror::Error;
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+use wayland_client::{
+    backend::WaylandError,
+    globals::{BindError, GlobalError},
+    ConnectError, DispatchError,
+};
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use reis::tokio::HandshakeError;
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("error in libei stream: {inner:?}")]
+pub struct ReisConvertStreamError {
+    inner: EiConvertEventStreamError,
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+impl From<EiConvertEventStreamError> for ReisConvertStreamError {
+    fn from(e: EiConvertEventStreamError) -> Self {
+        Self { inner: e }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum EmulationError {
+    #[error("event stream closed")]
+    EndOfStream,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei error flushing events: `{0}`")]
+    Libei(#[from] reis::event::Error),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("")]
+    LibeiConvertStream(#[from] ReisConvertStreamError),
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    #[error("wayland error: `{0}`")]
+    Wayland(#[from] wayland_client::backend::WaylandError),
+    #[cfg(all(
+        unix,
+        any(feature = "xdg_desktop_portal", feature = "libei"),
+        not(target_os = "macos")
+    ))]
+    #[error("xdg-desktop-portal: `{0}`")]
+    Ashpd(#[from] ashpd::Error),
+    #[error("io error: `{0}`")]
+    Io(#[from] io::Error),
+}
+
+#[derive(Debug, Error)]
+pub enum EmulationCreationError {
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    #[error("wlroots backend: `{0}`")]
+    Wlroots(#[from] WlrootsEmulationCreationError),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei backend: `{0}`")]
+    Libei(#[from] LibeiEmulationCreationError),
+    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+    #[error("xdg-desktop-portal: `{0}`")]
+    Xdp(#[from] XdpEmulationCreationError),
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    #[error("x11: `{0}`")]
+    X11(#[from] X11EmulationCreationError),
+    #[cfg(target_os = "macos")]
+    #[error("macos: `{0}`")]
+    MacOs(#[from] MacOSEmulationCreationError),
+    #[cfg(windows)]
+    #[error("windows: `{0}`")]
+    Windows(#[from] WindowsEmulationCreationError),
+    #[error("capture error")]
+    NoAvailableBackend,
+}
+
+impl EmulationCreationError {
+    /// request was intentionally denied by the user
+    pub(crate) fn cancelled_by_user(&self) -> bool {
+        #[cfg(feature = "libei")]
+        if matches!(
+            self,
+            EmulationCreationError::Libei(LibeiEmulationCreationError::Ashpd(Response(
+                ResponseError::Cancelled,
+            )))
+        ) {
+            return true;
+        }
+        #[cfg(feature = "xdg_desktop_portal")]
+        if matches!(
+            self,
+            EmulationCreationError::Xdp(XdpEmulationCreationError::Ashpd(Response(
+                ResponseError::Cancelled,
+            )))
+        ) {
+            return true;
+        }
+        false
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum WlrootsEmulationCreationError {
+    #[error(transparent)]
+    Connect(#[from] ConnectError),
+    #[error(transparent)]
+    Global(#[from] GlobalError),
+    #[error(transparent)]
+    Wayland(#[from] WaylandError),
+    #[error(transparent)]
+    Bind(#[from] WaylandBindError),
+    #[error(transparent)]
+    Dispatch(#[from] DispatchError),
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("wayland protocol \"{protocol}\" not supported: {inner}")]
+pub struct WaylandBindError {
+    inner: BindError,
+    protocol: &'static str,
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl WaylandBindError {
+    pub(crate) fn new(inner: BindError, protocol: &'static str) -> Self {
+        Self { inner, protocol }
+    }
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LibeiEmulationCreationError {
+    #[error(transparent)]
+    Ashpd(#[from] ashpd::Error),
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error(transparent)]
+    Handshake(#[from] HandshakeError),
+}
+
+#[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum XdpEmulationCreationError {
+    #[error(transparent)]
+    Ashpd(#[from] ashpd::Error),
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum X11EmulationCreationError {
+    #[error("could not open display")]
+    OpenDisplay,
+}
+
+#[cfg(target_os = "macos")]
+#[derive(Debug, Error)]
+pub enum MacOSEmulationCreationError {
+    #[error("could not create event source")]
+    EventSourceCreation,
+}
+
+#[cfg(windows)]
+#[derive(Debug, Error)]
+pub enum WindowsEmulationCreationError {}

input-emulation/src/lib.rs

@@ -0,0 +1,140 @@
+use async_trait::async_trait;
+use std::fmt::Display;
+
+use input_event::Event;
+
+pub use self::error::{EmulationCreationError, EmulationError, InputEmulationError};
+
+#[cfg(windows)]
+pub mod windows;
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+pub mod x11;
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+pub mod wlroots;
+
+#[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+pub mod xdg_desktop_portal;
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+pub mod libei;
+
+#[cfg(target_os = "macos")]
+pub mod macos;
+
+/// fallback input emulation (logs events)
+pub mod dummy;
+pub mod error;
+
+pub type EmulationHandle = u64;
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum Backend {
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    Wlroots,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    Libei,
+    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+    Xdp,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl Display for Backend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            Backend::Wlroots => write!(f, "wlroots"),
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            Backend::Libei => write!(f, "libei"),
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            Backend::Xdp => write!(f, "xdg-desktop-portal"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            Backend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            Backend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            Backend::MacOs => write!(f, "macos"),
+            Backend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+#[async_trait]
+pub trait InputEmulation: Send {
+    async fn consume(
+        &mut self,
+        event: Event,
+        handle: EmulationHandle,
+    ) -> Result<(), EmulationError>;
+    async fn create(&mut self, handle: EmulationHandle);
+    async fn destroy(&mut self, handle: EmulationHandle);
+    async fn terminate(&mut self);
+}
+
+pub async fn create_backend(
+    backend: Backend,
+) -> Result<Box<dyn InputEmulation>, EmulationCreationError> {
+    match backend {
+        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+        Backend::Wlroots => Ok(Box::new(wlroots::WlrootsEmulation::new()?)),
+        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+        Backend::Libei => Ok(Box::new(libei::LibeiEmulation::new().await?)),
+        #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+        Backend::X11 => Ok(Box::new(x11::X11Emulation::new()?)),
+        #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+        Backend::Xdp => Ok(Box::new(
+            xdg_desktop_portal::DesktopPortalEmulation::new().await?,
+        )),
+        #[cfg(windows)]
+        Backend::Windows => Ok(Box::new(windows::WindowsEmulation::new()?)),
+        #[cfg(target_os = "macos")]
+        Backend::MacOs => Ok(Box::new(macos::MacOSEmulation::new()?)),
+        Backend::Dummy => Ok(Box::new(dummy::DummyEmulation::new())),
+    }
+}
+
+pub async fn create(
+    backend: Option<Backend>,
+) -> Result<Box<dyn InputEmulation>, EmulationCreationError> {
+    if let Some(backend) = backend {
+        let b = create_backend(backend).await;
+        if b.is_ok() {
+            log::info!("using emulation backend: {backend}");
+        }
+        return b;
+    }
+
+    for backend in [
+        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+        Backend::Wlroots,
+        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+        Backend::Libei,
+        #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+        Backend::Xdp,
+        #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+        Backend::X11,
+        #[cfg(windows)]
+        Backend::Windows,
+        #[cfg(target_os = "macos")]
+        Backend::MacOs,
+        Backend::Dummy,
+    ] {
+        match create_backend(backend).await {
+            Ok(b) => {
+                log::info!("using emulation backend: {backend}");
+                return Ok(b);
+            }
+            Err(e) if e.cancelled_by_user() => return Err(e),
+            Err(e) => log::warn!("{e}"),
+        }
+    }
+
+    Err(EmulationCreationError::NoAvailableBackend)
+}

input-emulation/src/libei.rs

@@ -0,0 +1,372 @@
+use futures::{future, StreamExt};
+use once_cell::sync::Lazy;
+use std::{
+    collections::HashMap,
+    io,
+    os::{fd::OwnedFd, unix::net::UnixStream},
+    sync::{
+        atomic::{AtomicBool, AtomicU32, Ordering},
+        Arc, Mutex, RwLock,
+    },
+    time::{SystemTime, UNIX_EPOCH},
+};
+use tokio::task::JoinHandle;
+
+use ashpd::{
+    desktop::{
+        remote_desktop::{DeviceType, RemoteDesktop},
+        PersistMode, Session,
+    },
+    WindowIdentifier,
+};
+use async_trait::async_trait;
+
+use reis::{
+    ei::{
+        self, button::ButtonState, handshake::ContextType, keyboard::KeyState, Button, Keyboard,
+        Pointer, Scroll,
+    },
+    event::{DeviceCapability, DeviceEvent, EiEvent, SeatEvent},
+    tokio::{ei_handshake, EiConvertEventStream, EiEventStream},
+};
+
+use input_event::{Event, KeyboardEvent, PointerEvent};
+
+use crate::error::{EmulationError, ReisConvertStreamError};
+
+use super::{error::LibeiEmulationCreationError, EmulationHandle, InputEmulation};
+
+static INTERFACES: Lazy<HashMap<&'static str, u32>> = Lazy::new(|| {
+    let mut m = HashMap::new();
+    m.insert("ei_connection", 1);
+    m.insert("ei_callback", 1);
+    m.insert("ei_pingpong", 1);
+    m.insert("ei_seat", 1);
+    m.insert("ei_device", 2);
+    m.insert("ei_pointer", 1);
+    m.insert("ei_pointer_absolute", 1);
+    m.insert("ei_scroll", 1);
+    m.insert("ei_button", 1);
+    m.insert("ei_keyboard", 1);
+    m.insert("ei_touchscreen", 1);
+    m
+});
+
+#[derive(Clone, Default)]
+struct Devices {
+    pointer: Arc<RwLock<Option<(ei::Device, ei::Pointer)>>>,
+    scroll: Arc<RwLock<Option<(ei::Device, ei::Scroll)>>>,
+    button: Arc<RwLock<Option<(ei::Device, ei::Button)>>>,
+    keyboard: Arc<RwLock<Option<(ei::Device, ei::Keyboard)>>>,
+}
+
+pub struct LibeiEmulation<'a> {
+    context: ei::Context,
+    devices: Devices,
+    ei_task: JoinHandle<()>,
+    error: Arc<Mutex<Option<EmulationError>>>,
+    libei_error: Arc<AtomicBool>,
+    serial: AtomicU32,
+    _remote_desktop: RemoteDesktop<'a>,
+    session: Session<'a, RemoteDesktop<'a>>,
+}
+
+async fn get_ei_fd<'a>(
+) -> Result<(RemoteDesktop<'a>, Session<'a, RemoteDesktop<'a>>, OwnedFd), ashpd::Error> {
+    let remote_desktop = RemoteDesktop::new().await?;
+
+    log::debug!("creating session ...");
+    let session = remote_desktop.create_session().await?;
+
+    log::debug!("selecting devices ...");
+    remote_desktop
+        .select_devices(
+            &session,
+            DeviceType::Keyboard | DeviceType::Pointer,
+            None,
+            PersistMode::ExplicitlyRevoked,
+        )
+        .await?;
+
+    log::info!("requesting permission for input emulation");
+    let _devices = remote_desktop
+        .start(&session, &WindowIdentifier::default())
+        .await?
+        .response()?;
+
+    let fd = remote_desktop.connect_to_eis(&session).await?;
+    Ok((remote_desktop, session, fd))
+}
+
+impl<'a> LibeiEmulation<'a> {
+    pub async fn new() -> Result<Self, LibeiEmulationCreationError> {
+        let (_remote_desktop, session, eifd) = get_ei_fd().await?;
+        let stream = UnixStream::from(eifd);
+        stream.set_nonblocking(true)?;
+        let context = ei::Context::new(stream)?;
+        let mut events = EiEventStream::new(context.clone())?;
+        let handshake = ei_handshake(
+            &mut events,
+            "de.feschber.LanMouse",
+            ContextType::Sender,
+            &INTERFACES,
+        )
+        .await?;
+        let events = EiConvertEventStream::new(events, handshake.serial);
+        let devices = Devices::default();
+        let libei_error = Arc::new(AtomicBool::default());
+        let error = Arc::new(Mutex::new(None));
+        let ei_handler = ei_task(
+            events,
+            context.clone(),
+            devices.clone(),
+            libei_error.clone(),
+            error.clone(),
+        );
+        let ei_task = tokio::task::spawn_local(ei_handler);
+
+        let serial = AtomicU32::new(handshake.serial);
+
+        Ok(Self {
+            context,
+            devices,
+            ei_task,
+            error,
+            libei_error,
+            serial,
+            _remote_desktop,
+            session,
+        })
+    }
+}
+
+impl<'a> Drop for LibeiEmulation<'a> {
+    fn drop(&mut self) {
+        self.ei_task.abort();
+    }
+}
+
+#[async_trait]
+impl<'a> InputEmulation for LibeiEmulation<'a> {
+    async fn consume(
+        &mut self,
+        event: Event,
+        _handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        let now = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap()
+            .as_micros() as u64;
+        if self.libei_error.load(Ordering::SeqCst) {
+            // don't break sending additional events but signal error
+            if let Some(e) = self.error.lock().unwrap().take() {
+                return Err(e);
+            }
+        }
+        match event {
+            Event::Pointer(p) => match p {
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    let pointer_device = self.devices.pointer.read().unwrap();
+                    if let Some((d, p)) = pointer_device.as_ref() {
+                        p.motion_relative(dx as f32, dy as f32);
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::Button {
+                    time: _,
+                    button,
+                    state,
+                } => {
+                    let button_device = self.devices.button.read().unwrap();
+                    if let Some((d, b)) = button_device.as_ref() {
+                        b.button(
+                            button,
+                            match state {
+                                0 => ButtonState::Released,
+                                _ => ButtonState::Press,
+                            },
+                        );
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::Axis {
+                    time: _,
+                    axis,
+                    value,
+                } => {
+                    let scroll_device = self.devices.scroll.read().unwrap();
+                    if let Some((d, s)) = scroll_device.as_ref() {
+                        match axis {
+                            0 => s.scroll(0., value as f32),
+                            _ => s.scroll(value as f32, 0.),
+                        }
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::AxisDiscrete120 { axis, value } => {
+                    let scroll_device = self.devices.scroll.read().unwrap();
+                    if let Some((d, s)) = scroll_device.as_ref() {
+                        match axis {
+                            0 => s.scroll_discrete(0, value),
+                            _ => s.scroll_discrete(value, 0),
+                        }
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::Frame {} => {}
+            },
+            Event::Keyboard(k) => match k {
+                KeyboardEvent::Key {
+                    time: _,
+                    key,
+                    state,
+                } => {
+                    let keyboard_device = self.devices.keyboard.read().unwrap();
+                    if let Some((d, k)) = keyboard_device.as_ref() {
+                        k.key(
+                            key,
+                            match state {
+                                0 => KeyState::Released,
+                                _ => KeyState::Press,
+                            },
+                        );
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                KeyboardEvent::Modifiers { .. } => {}
+            },
+            _ => {}
+        }
+        self.context
+            .flush()
+            .map_err(|e| io::Error::new(e.kind(), e))?;
+        Ok(())
+    }
+
+    async fn create(&mut self, _: EmulationHandle) {}
+    async fn destroy(&mut self, _: EmulationHandle) {}
+
+    async fn terminate(&mut self) {
+        let _ = self.session.close().await;
+        self.ei_task.abort();
+    }
+}
+
+async fn ei_task(
+    mut events: EiConvertEventStream,
+    context: ei::Context,
+    devices: Devices,
+    libei_error: Arc<AtomicBool>,
+    error: Arc<Mutex<Option<EmulationError>>>,
+) {
+    loop {
+        match ei_event_handler(&mut events, &context, &devices).await {
+            Ok(()) => {}
+            Err(e) => {
+                libei_error.store(true, Ordering::SeqCst);
+                error.lock().unwrap().replace(e);
+                // wait for termination -> otherwise we will loop forever
+                future::pending::<()>().await;
+            }
+        }
+    }
+}
+
+async fn ei_event_handler(
+    events: &mut EiConvertEventStream,
+    context: &ei::Context,
+    devices: &Devices,
+) -> Result<(), EmulationError> {
+    loop {
+        let event = events
+            .next()
+            .await
+            .ok_or(EmulationError::EndOfStream)?
+            .map_err(ReisConvertStreamError::from)?;
+        const CAPABILITIES: &[DeviceCapability] = &[
+            DeviceCapability::Pointer,
+            DeviceCapability::PointerAbsolute,
+            DeviceCapability::Keyboard,
+            DeviceCapability::Touch,
+            DeviceCapability::Scroll,
+            DeviceCapability::Button,
+        ];
+        log::debug!("{event:?}");
+        match event {
+            EiEvent::Disconnected(e) => {
+                log::debug!("ei disconnected: {e:?}");
+                return Err(EmulationError::EndOfStream);
+            }
+            EiEvent::SeatAdded(e) => {
+                e.seat().bind_capabilities(CAPABILITIES);
+            }
+            EiEvent::SeatRemoved(e) => {
+                log::debug!("seat removed: {:?}", e.seat());
+            }
+            EiEvent::DeviceAdded(e) => {
+                let device_type = e.device().device_type();
+                log::debug!("device added: {device_type:?}");
+                e.device().device();
+                let device = e.device();
+                if let Some(pointer) = e.device().interface::<Pointer>() {
+                    devices
+                        .pointer
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), pointer));
+                }
+                if let Some(keyboard) = e.device().interface::<Keyboard>() {
+                    devices
+                        .keyboard
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), keyboard));
+                }
+                if let Some(scroll) = e.device().interface::<Scroll>() {
+                    devices
+                        .scroll
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), scroll));
+                }
+                if let Some(button) = e.device().interface::<Button>() {
+                    devices
+                        .button
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), button));
+                }
+            }
+            EiEvent::DeviceRemoved(e) => {
+                log::debug!("device removed: {:?}", e.device().device_type());
+            }
+            EiEvent::DevicePaused(e) => {
+                log::debug!("device paused: {:?}", e.device().device_type());
+            }
+            EiEvent::DeviceResumed(e) => {
+                log::debug!("device resumed: {:?}", e.device().device_type());
+                e.device().device().start_emulating(0, 0);
+            }
+            EiEvent::KeyboardModifiers(e) => {
+                log::debug!("modifiers: {e:?}");
+            }
+            // only for receiver context
+            // EiEvent::Frame(_) => { },
+            // EiEvent::DeviceStartEmulating(_) => { },
+            // EiEvent::DeviceStopEmulating(_) => { },
+            // EiEvent::PointerMotion(_) => { },
+            // EiEvent::PointerMotionAbsolute(_) => { },
+            // EiEvent::Button(_) => { },
+            // EiEvent::ScrollDelta(_) => { },
+            // EiEvent::ScrollStop(_) => { },
+            // EiEvent::ScrollCancel(_) => { },
+            // EiEvent::ScrollDiscrete(_) => { },
+            // EiEvent::KeyboardKey(_) => { },
+            // EiEvent::TouchDown(_) => { },
+            // EiEvent::TouchUp(_) => { },
+            // EiEvent::TouchMotion(_) => { },
+            _ => unreachable!("unexpected ei event"),
+        }
+        context.flush().map_err(|e| io::Error::new(e.kind(), e))?;
+    }
+}

input-emulation/src/macos.rs

@@ -0,0 +1,300 @@
+use super::{error::EmulationError, EmulationHandle, InputEmulation};
+use async_trait::async_trait;
+use core_graphics::display::{CGDisplayBounds, CGMainDisplayID, CGPoint};
+use core_graphics::event::{
+    CGEvent, CGEventTapLocation, CGEventType, CGKeyCode, CGMouseButton, EventField, ScrollEventUnit,
+};
+use core_graphics::event_source::{CGEventSource, CGEventSourceStateID};
+use input_event::{Event, KeyboardEvent, PointerEvent};
+use keycode::{KeyMap, KeyMapping};
+use std::ops::{Index, IndexMut};
+use std::time::Duration;
+use tokio::task::AbortHandle;
+
+use super::error::MacOSEmulationCreationError;
+
+const DEFAULT_REPEAT_DELAY: Duration = Duration::from_millis(500);
+const DEFAULT_REPEAT_INTERVAL: Duration = Duration::from_millis(32);
+
+pub struct MacOSEmulation {
+    pub event_source: CGEventSource,
+    repeat_task: Option<AbortHandle>,
+    button_state: ButtonState,
+}
+
+struct ButtonState {
+    left: bool,
+    right: bool,
+    center: bool,
+}
+
+impl Index<CGMouseButton> for ButtonState {
+    type Output = bool;
+
+    fn index(&self, index: CGMouseButton) -> &Self::Output {
+        match index {
+            CGMouseButton::Left => &self.left,
+            CGMouseButton::Right => &self.right,
+            CGMouseButton::Center => &self.center,
+        }
+    }
+}
+
+impl IndexMut<CGMouseButton> for ButtonState {
+    fn index_mut(&mut self, index: CGMouseButton) -> &mut Self::Output {
+        match index {
+            CGMouseButton::Left => &mut self.left,
+            CGMouseButton::Right => &mut self.right,
+            CGMouseButton::Center => &mut self.center,
+        }
+    }
+}
+
+unsafe impl Send for MacOSEmulation {}
+
+impl MacOSEmulation {
+    pub fn new() -> Result<Self, MacOSEmulationCreationError> {
+        let event_source = CGEventSource::new(CGEventSourceStateID::CombinedSessionState)
+            .map_err(|_| MacOSEmulationCreationError::EventSourceCreation)?;
+        let button_state = ButtonState {
+            left: false,
+            right: false,
+            center: false,
+        };
+        Ok(Self {
+            event_source,
+            button_state,
+            repeat_task: None,
+        })
+    }
+
+    fn get_mouse_location(&self) -> Option<CGPoint> {
+        let event: CGEvent = CGEvent::new(self.event_source.clone()).ok()?;
+        Some(event.location())
+    }
+
+    async fn spawn_repeat_task(&mut self, key: u16) {
+        // there can only be one repeating key and it's
+        // always the last to be pressed
+        self.kill_repeat_task();
+        let event_source = self.event_source.clone();
+        let repeat_task = tokio::task::spawn_local(async move {
+            tokio::time::sleep(DEFAULT_REPEAT_DELAY).await;
+            loop {
+                key_event(event_source.clone(), key, 1);
+                tokio::time::sleep(DEFAULT_REPEAT_INTERVAL).await;
+            }
+        });
+        self.repeat_task = Some(repeat_task.abort_handle());
+    }
+    fn kill_repeat_task(&mut self) {
+        if let Some(task) = self.repeat_task.take() {
+            task.abort();
+        }
+    }
+}
+
+fn key_event(event_source: CGEventSource, key: u16, state: u8) {
+    let event = match CGEvent::new_keyboard_event(event_source, key, state != 0) {
+        Ok(e) => e,
+        Err(_) => {
+            log::warn!("unable to create key event");
+            return;
+        }
+    };
+    event.post(CGEventTapLocation::HID);
+}
+
+#[async_trait]
+impl InputEmulation for MacOSEmulation {
+    async fn consume(
+        &mut self,
+        event: Event,
+        _handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        match event {
+            Event::Pointer(pointer_event) => match pointer_event {
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    // FIXME secondary displays?
+                    let (min_x, min_y, max_x, max_y) = unsafe {
+                        let display = CGMainDisplayID();
+                        let bounds = CGDisplayBounds(display);
+                        let min_x = bounds.origin.x;
+                        let max_x = bounds.origin.x + bounds.size.width;
+                        let min_y = bounds.origin.y;
+                        let max_y = bounds.origin.y + bounds.size.height;
+                        (min_x as f64, min_y as f64, max_x as f64, max_y as f64)
+                    };
+                    let mut mouse_location = match self.get_mouse_location() {
+                        Some(l) => l,
+                        None => {
+                            log::warn!("could not get mouse location!");
+                            return Ok(());
+                        }
+                    };
+
+                    mouse_location.x = (mouse_location.x + dx).clamp(min_x, max_x - 1.);
+                    mouse_location.y = (mouse_location.y + dy).clamp(min_y, max_y - 1.);
+
+                    let mut event_type = CGEventType::MouseMoved;
+                    if self.button_state.left {
+                        event_type = CGEventType::LeftMouseDragged
+                    } else if self.button_state.right {
+                        event_type = CGEventType::RightMouseDragged
+                    } else if self.button_state.center {
+                        event_type = CGEventType::OtherMouseDragged
+                    };
+                    let event = match CGEvent::new_mouse_event(
+                        self.event_source.clone(),
+                        event_type,
+                        mouse_location,
+                        CGMouseButton::Left,
+                    ) {
+                        Ok(e) => e,
+                        Err(_) => {
+                            log::warn!("mouse event creation failed!");
+                            return Ok(());
+                        }
+                    };
+                    event.set_integer_value_field(EventField::MOUSE_EVENT_DELTA_X, dx as i64);
+                    event.set_integer_value_field(EventField::MOUSE_EVENT_DELTA_Y, dy as i64);
+                    event.post(CGEventTapLocation::HID);
+                }
+                PointerEvent::Button {
+                    time: _,
+                    button,
+                    state,
+                } => {
+                    let (event_type, mouse_button) = match (button, state) {
+                        (b, 1) if b == input_event::BTN_LEFT => {
+                            (CGEventType::LeftMouseDown, CGMouseButton::Left)
+                        }
+                        (b, 0) if b == input_event::BTN_LEFT => {
+                            (CGEventType::LeftMouseUp, CGMouseButton::Left)
+                        }
+                        (b, 1) if b == input_event::BTN_RIGHT => {
+                            (CGEventType::RightMouseDown, CGMouseButton::Right)
+                        }
+                        (b, 0) if b == input_event::BTN_RIGHT => {
+                            (CGEventType::RightMouseUp, CGMouseButton::Right)
+                        }
+                        (b, 1) if b == input_event::BTN_MIDDLE => {
+                            (CGEventType::OtherMouseDown, CGMouseButton::Center)
+                        }
+                        (b, 0) if b == input_event::BTN_MIDDLE => {
+                            (CGEventType::OtherMouseUp, CGMouseButton::Center)
+                        }
+                        _ => {
+                            log::warn!("invalid button event: {button},{state}");
+                            return Ok(());
+                        }
+                    };
+                    // store button state
+                    self.button_state[mouse_button] = state == 1;
+
+                    let location = self.get_mouse_location().unwrap();
+                    let event = match CGEvent::new_mouse_event(
+                        self.event_source.clone(),
+                        event_type,
+                        location,
+                        mouse_button,
+                    ) {
+                        Ok(e) => e,
+                        Err(()) => {
+                            log::warn!("mouse event creation failed!");
+                            return Ok(());
+                        }
+                    };
+                    event.post(CGEventTapLocation::HID);
+                }
+                PointerEvent::Axis {
+                    time: _,
+                    axis,
+                    value,
+                } => {
+                    let value = value as i32;
+                    let (count, wheel1, wheel2, wheel3) = match axis {
+                        0 => (1, value, 0, 0), // 0 = vertical => 1 scroll wheel device (y axis)
+                        1 => (2, 0, value, 0), // 1 = horizontal => 2 scroll wheel devices (y, x) -> (0, x)
+                        _ => {
+                            log::warn!("invalid scroll event: {axis}, {value}");
+                            return Ok(());
+                        }
+                    };
+                    let event = match CGEvent::new_scroll_event(
+                        self.event_source.clone(),
+                        ScrollEventUnit::PIXEL,
+                        count,
+                        wheel1,
+                        wheel2,
+                        wheel3,
+                    ) {
+                        Ok(e) => e,
+                        Err(()) => {
+                            log::warn!("scroll event creation failed!");
+                            return Ok(());
+                        }
+                    };
+                    event.post(CGEventTapLocation::HID);
+                }
+                PointerEvent::AxisDiscrete120 { axis, value } => {
+                    let (count, wheel1, wheel2, wheel3) = match axis {
+                        0 => (1, value, 0, 0), // 0 = vertical => 1 scroll wheel device (y axis)
+                        1 => (2, 0, value, 0), // 1 = horizontal => 2 scroll wheel devices (y, x) -> (0, x)
+                        _ => {
+                            log::warn!("invalid scroll event: {axis}, {value}");
+                            return Ok(());
+                        }
+                    };
+                    let event = match CGEvent::new_scroll_event(
+                        self.event_source.clone(),
+                        ScrollEventUnit::PIXEL,
+                        count,
+                        wheel1,
+                        wheel2,
+                        wheel3,
+                    ) {
+                        Ok(e) => e,
+                        Err(()) => {
+                            log::warn!("scroll event creation failed!");
+                            return Ok(());
+                        }
+                    };
+                    event.post(CGEventTapLocation::HID);
+                }
+                PointerEvent::Frame { .. } => {}
+            },
+            Event::Keyboard(keyboard_event) => match keyboard_event {
+                KeyboardEvent::Key {
+                    time: _,
+                    key,
+                    state,
+                } => {
+                    let code = match KeyMap::from_key_mapping(KeyMapping::Evdev(key as u16)) {
+                        Ok(k) => k.mac as CGKeyCode,
+                        Err(_) => {
+                            log::warn!("unable to map key event");
+                            return Ok(());
+                        }
+                    };
+                    match state {
+                        // pressed
+                        1 => self.spawn_repeat_task(code).await,
+                        _ => self.kill_repeat_task(),
+                    }
+                    key_event(self.event_source.clone(), code, state)
+                }
+                KeyboardEvent::Modifiers { .. } => {}
+            },
+            _ => (),
+        }
+        // FIXME
+        Ok(())
+    }
+
+    async fn create(&mut self, _handle: EmulationHandle) {}
+
+    async fn destroy(&mut self, _handle: EmulationHandle) {}
+
+    async fn terminate(&mut self) {}
+}

input-emulation/src/windows.rs

@@ -0,0 +1,239 @@
+use super::error::{EmulationError, WindowsEmulationCreationError};
+use input_event::{
+    scancode, Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE,
+    BTN_RIGHT,
+};
+
+use async_trait::async_trait;
+use std::ops::BitOrAssign;
+use std::time::Duration;
+use tokio::task::AbortHandle;
+use windows::Win32::UI::Input::KeyboardAndMouse::{
+    SendInput, INPUT_0, KEYEVENTF_EXTENDEDKEY, MOUSEEVENTF_XDOWN, MOUSEEVENTF_XUP,
+};
+use windows::Win32::UI::Input::KeyboardAndMouse::{
+    INPUT, INPUT_KEYBOARD, INPUT_MOUSE, KEYBDINPUT, KEYEVENTF_KEYUP, KEYEVENTF_SCANCODE,
+    MOUSEEVENTF_HWHEEL, MOUSEEVENTF_LEFTDOWN, MOUSEEVENTF_LEFTUP, MOUSEEVENTF_MIDDLEDOWN,
+    MOUSEEVENTF_MIDDLEUP, MOUSEEVENTF_MOVE, MOUSEEVENTF_RIGHTDOWN, MOUSEEVENTF_RIGHTUP,
+    MOUSEEVENTF_WHEEL, MOUSEINPUT,
+};
+use windows::Win32::UI::WindowsAndMessaging::{XBUTTON1, XBUTTON2};
+
+use super::{EmulationHandle, InputEmulation};
+
+const DEFAULT_REPEAT_DELAY: Duration = Duration::from_millis(500);
+const DEFAULT_REPEAT_INTERVAL: Duration = Duration::from_millis(32);
+
+pub struct WindowsEmulation {
+    repeat_task: Option<AbortHandle>,
+}
+
+impl WindowsEmulation {
+    pub fn new() -> Result<Self, WindowsEmulationCreationError> {
+        Ok(Self { repeat_task: None })
+    }
+}
+
+#[async_trait]
+impl InputEmulation for WindowsEmulation {
+    async fn consume(&mut self, event: Event, _: EmulationHandle) -> Result<(), EmulationError> {
+        match event {
+            Event::Pointer(pointer_event) => match pointer_event {
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    rel_mouse(dx as i32, dy as i32);
+                }
+                PointerEvent::Button {
+                    time: _,
+                    button,
+                    state,
+                } => mouse_button(button, state),
+                PointerEvent::Axis {
+                    time: _,
+                    axis,
+                    value,
+                } => scroll(axis, value as i32),
+                PointerEvent::AxisDiscrete120 { axis, value } => scroll(axis, value),
+                PointerEvent::Frame {} => {}
+            },
+            Event::Keyboard(keyboard_event) => match keyboard_event {
+                KeyboardEvent::Key {
+                    time: _,
+                    key,
+                    state,
+                } => {
+                    match state {
+                        // pressed
+                        0 => self.kill_repeat_task(),
+                        1 => self.spawn_repeat_task(key).await,
+                        _ => {}
+                    }
+                    key_event(key, state)
+                }
+                KeyboardEvent::Modifiers { .. } => {}
+            },
+            _ => {}
+        }
+        // FIXME
+        Ok(())
+    }
+
+    async fn create(&mut self, _handle: EmulationHandle) {}
+
+    async fn destroy(&mut self, _handle: EmulationHandle) {}
+
+    async fn terminate(&mut self) {}
+}
+
+impl WindowsEmulation {
+    async fn spawn_repeat_task(&mut self, key: u32) {
+        // there can only be one repeating key and it's
+        // always the last to be pressed
+        self.kill_repeat_task();
+        let repeat_task = tokio::task::spawn_local(async move {
+            tokio::time::sleep(DEFAULT_REPEAT_DELAY).await;
+            loop {
+                key_event(key, 1);
+                tokio::time::sleep(DEFAULT_REPEAT_INTERVAL).await;
+            }
+        });
+        self.repeat_task = Some(repeat_task.abort_handle());
+    }
+    fn kill_repeat_task(&mut self) {
+        if let Some(task) = self.repeat_task.take() {
+            task.abort();
+        }
+    }
+}
+
+fn send_input_safe(input: INPUT) {
+    unsafe {
+        loop {
+            /* retval = number of successfully submitted events */
+            if SendInput(&[input], std::mem::size_of::<INPUT>() as i32) > 0 {
+                break;
+            }
+        }
+    }
+}
+
+fn send_mouse_input(mi: MOUSEINPUT) {
+    send_input_safe(INPUT {
+        r#type: INPUT_MOUSE,
+        Anonymous: INPUT_0 { mi },
+    });
+}
+
+fn send_keyboard_input(ki: KEYBDINPUT) {
+    send_input_safe(INPUT {
+        r#type: INPUT_KEYBOARD,
+        Anonymous: INPUT_0 { ki },
+    });
+}
+fn rel_mouse(dx: i32, dy: i32) {
+    let mi = MOUSEINPUT {
+        dx,
+        dy,
+        mouseData: 0,
+        dwFlags: MOUSEEVENTF_MOVE,
+        time: 0,
+        dwExtraInfo: 0,
+    };
+    send_mouse_input(mi);
+}
+
+fn mouse_button(button: u32, state: u32) {
+    let dw_flags = match state {
+        0 => match button {
+            BTN_LEFT => MOUSEEVENTF_LEFTUP,
+            BTN_RIGHT => MOUSEEVENTF_RIGHTUP,
+            BTN_MIDDLE => MOUSEEVENTF_MIDDLEUP,
+            BTN_BACK => MOUSEEVENTF_XUP,
+            BTN_FORWARD => MOUSEEVENTF_XUP,
+            _ => return,
+        },
+        1 => match button {
+            BTN_LEFT => MOUSEEVENTF_LEFTDOWN,
+            BTN_RIGHT => MOUSEEVENTF_RIGHTDOWN,
+            BTN_MIDDLE => MOUSEEVENTF_MIDDLEDOWN,
+            BTN_BACK => MOUSEEVENTF_XDOWN,
+            BTN_FORWARD => MOUSEEVENTF_XDOWN,
+            _ => return,
+        },
+        _ => return,
+    };
+    let mouse_data = match button {
+        BTN_BACK => XBUTTON1 as u32,
+        BTN_FORWARD => XBUTTON2 as u32,
+        _ => 0,
+    };
+    let mi = MOUSEINPUT {
+        dx: 0,
+        dy: 0, // no movement
+        mouseData: mouse_data,
+        dwFlags: dw_flags,
+        time: 0,
+        dwExtraInfo: 0,
+    };
+    send_mouse_input(mi);
+}
+
+fn scroll(axis: u8, value: i32) {
+    let event_type = match axis {
+        0 => MOUSEEVENTF_WHEEL,
+        1 => MOUSEEVENTF_HWHEEL,
+        _ => return,
+    };
+    let mi = MOUSEINPUT {
+        dx: 0,
+        dy: 0,
+        mouseData: -value as u32,
+        dwFlags: event_type,
+        time: 0,
+        dwExtraInfo: 0,
+    };
+    send_mouse_input(mi);
+}
+
+fn key_event(key: u32, state: u8) {
+    let scancode = match linux_keycode_to_windows_scancode(key) {
+        Some(code) => code,
+        None => return,
+    };
+    let extended = scancode > 0xff;
+    let scancode = scancode & 0xff;
+    let mut flags = KEYEVENTF_SCANCODE;
+    if extended {
+        flags.bitor_assign(KEYEVENTF_EXTENDEDKEY);
+    }
+    if state == 0 {
+        flags.bitor_assign(KEYEVENTF_KEYUP);
+    }
+    let ki = KEYBDINPUT {
+        wVk: Default::default(),
+        wScan: scancode,
+        dwFlags: flags,
+        time: 0,
+        dwExtraInfo: 0,
+    };
+    send_keyboard_input(ki);
+}
+
+fn linux_keycode_to_windows_scancode(linux_keycode: u32) -> Option<u16> {
+    let linux_scancode = match scancode::Linux::try_from(linux_keycode) {
+        Ok(s) => s,
+        Err(_) => {
+            log::warn!("unknown keycode: {linux_keycode}");
+            return None;
+        }
+    };
+    log::trace!("linux code: {linux_scancode:?}");
+    let windows_scancode = match scancode::Windows::try_from(linux_scancode) {
+        Ok(s) => s,
+        Err(_) => {
+            log::warn!("failed to translate linux code into windows scancode: {linux_scancode:?}");
+            return None;
+        }
+    };
+    log::trace!("windows code: {windows_scancode:?}");
+    Some(windows_scancode as u16)
+}

input-emulation/src/wlroots.rs

@@ -0,0 +1,277 @@
+use crate::error::EmulationError;
+
+use super::{error::WlrootsEmulationCreationError, InputEmulation};
+use async_trait::async_trait;
+use std::collections::HashMap;
+use std::io;
+use std::os::fd::{AsFd, OwnedFd};
+use wayland_client::backend::WaylandError;
+use wayland_client::WEnum;
+
+use wayland_client::protocol::wl_keyboard::{self, WlKeyboard};
+use wayland_client::protocol::wl_pointer::{Axis, ButtonState};
+use wayland_client::protocol::wl_seat::WlSeat;
+use wayland_protocols_wlr::virtual_pointer::v1::client::{
+    zwlr_virtual_pointer_manager_v1::ZwlrVirtualPointerManagerV1 as VpManager,
+    zwlr_virtual_pointer_v1::ZwlrVirtualPointerV1 as Vp,
+};
+
+use wayland_protocols_misc::zwp_virtual_keyboard_v1::client::{
+    zwp_virtual_keyboard_manager_v1::ZwpVirtualKeyboardManagerV1 as VkManager,
+    zwp_virtual_keyboard_v1::ZwpVirtualKeyboardV1 as Vk,
+};
+
+use wayland_client::{
+    delegate_noop,
+    globals::{registry_queue_init, GlobalListContents},
+    protocol::{wl_registry, wl_seat},
+    Connection, Dispatch, EventQueue, QueueHandle,
+};
+
+use input_event::{Event, KeyboardEvent, PointerEvent};
+
+use super::error::WaylandBindError;
+use super::EmulationHandle;
+
+struct State {
+    keymap: Option<(u32, OwnedFd, u32)>,
+    input_for_client: HashMap<EmulationHandle, VirtualInput>,
+    seat: wl_seat::WlSeat,
+    qh: QueueHandle<Self>,
+    vpm: VpManager,
+    vkm: VkManager,
+}
+
+// App State, implements Dispatch event handlers
+pub(crate) struct WlrootsEmulation {
+    last_flush_failed: bool,
+    state: State,
+    queue: EventQueue<State>,
+}
+
+impl WlrootsEmulation {
+    pub fn new() -> Result<Self, WlrootsEmulationCreationError> {
+        let conn = Connection::connect_to_env()?;
+        let (globals, queue) = registry_queue_init::<State>(&conn)?;
+        let qh = queue.handle();
+
+        let seat: wl_seat::WlSeat = globals
+            .bind(&qh, 7..=8, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_seat 7..=8"))?;
+
+        let vpm: VpManager = globals
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "wlr-virtual-pointer-unstable-v1"))?;
+        let vkm: VkManager = globals
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "virtual-keyboard-unstable-v1"))?;
+
+        let input_for_client: HashMap<EmulationHandle, VirtualInput> = HashMap::new();
+
+        let mut emulate = WlrootsEmulation {
+            last_flush_failed: false,
+            state: State {
+                keymap: None,
+                input_for_client,
+                seat,
+                vpm,
+                vkm,
+                qh,
+            },
+            queue,
+        };
+        while emulate.state.keymap.is_none() {
+            emulate.queue.blocking_dispatch(&mut emulate.state)?;
+        }
+        // let fd = unsafe { &File::from_raw_fd(emulate.state.keymap.unwrap().1.as_raw_fd()) };
+        // let mmap = unsafe { MmapOptions::new().map_copy(fd).unwrap() };
+        // log::debug!("{:?}", &mmap[..100]);
+        Ok(emulate)
+    }
+}
+
+impl State {
+    fn add_client(&mut self, client: EmulationHandle) {
+        let pointer: Vp = self.vpm.create_virtual_pointer(None, &self.qh, ());
+        let keyboard: Vk = self.vkm.create_virtual_keyboard(&self.seat, &self.qh, ());
+
+        // TODO: use server side keymap
+        if let Some((format, fd, size)) = self.keymap.as_ref() {
+            keyboard.keymap(*format, fd.as_fd(), *size);
+        } else {
+            panic!("no keymap");
+        }
+
+        let vinput = VirtualInput { pointer, keyboard };
+
+        self.input_for_client.insert(client, vinput);
+    }
+
+    fn destroy_client(&mut self, handle: EmulationHandle) {
+        if let Some(input) = self.input_for_client.remove(&handle) {
+            input.pointer.destroy();
+            input.keyboard.destroy();
+        }
+    }
+}
+
+#[async_trait]
+impl InputEmulation for WlrootsEmulation {
+    async fn consume(
+        &mut self,
+        event: Event,
+        handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        if let Some(virtual_input) = self.state.input_for_client.get(&handle) {
+            if self.last_flush_failed {
+                match self.queue.flush() {
+                    Err(WaylandError::Io(e)) if e.kind() == io::ErrorKind::WouldBlock => {
+                        /*
+                         * outgoing buffer is full - sending more events
+                         * will overwhelm the output buffer and leave the
+                         * wayland connection in a broken state
+                         */
+                        log::warn!("can't keep up, discarding event: ({handle}) - {event:?}");
+                        return Ok(());
+                    }
+                    _ => {}
+                }
+            }
+            virtual_input
+                .consume_event(event)
+                .unwrap_or_else(|_| panic!("failed to convert event: {event:?}"));
+            match self.queue.flush() {
+                Err(WaylandError::Io(e)) if e.kind() == io::ErrorKind::WouldBlock => {
+                    self.last_flush_failed = true;
+                    log::warn!("can't keep up, discarding event: ({handle}) - {event:?}");
+                }
+                Err(WaylandError::Protocol(e)) => panic!("wayland protocol violation: {e}"),
+                Ok(()) => self.last_flush_failed = false,
+                Err(e) => Err(e)?,
+            }
+        }
+        Ok(())
+    }
+
+    async fn create(&mut self, handle: EmulationHandle) {
+        self.state.add_client(handle);
+        if let Err(e) = self.queue.flush() {
+            log::error!("{}", e);
+        }
+    }
+    async fn destroy(&mut self, handle: EmulationHandle) {
+        self.state.destroy_client(handle);
+        if let Err(e) = self.queue.flush() {
+            log::error!("{}", e);
+        }
+    }
+    async fn terminate(&mut self) {
+        /* nothing to do */
+    }
+}
+
+struct VirtualInput {
+    pointer: Vp,
+    keyboard: Vk,
+}
+
+impl VirtualInput {
+    fn consume_event(&self, event: Event) -> Result<(), ()> {
+        match event {
+            Event::Pointer(e) => {
+                match e {
+                    PointerEvent::Motion { time, dx, dy } => self.pointer.motion(time, dx, dy),
+                    PointerEvent::Button {
+                        time,
+                        button,
+                        state,
+                    } => {
+                        let state: ButtonState = state.try_into()?;
+                        self.pointer.button(time, button, state);
+                    }
+                    PointerEvent::Axis { time, axis, value } => {
+                        let axis: Axis = (axis as u32).try_into()?;
+                        self.pointer.axis(time, axis, value);
+                        self.pointer.frame();
+                    }
+                    PointerEvent::AxisDiscrete120 { axis, value } => {
+                        let axis: Axis = (axis as u32).try_into()?;
+                        self.pointer
+                            .axis_discrete(0, axis, value as f64 / 6., value / 120);
+                        self.pointer.frame();
+                    }
+                    PointerEvent::Frame {} => self.pointer.frame(),
+                }
+                self.pointer.frame();
+            }
+            Event::Keyboard(e) => match e {
+                KeyboardEvent::Key { time, key, state } => {
+                    self.keyboard.key(time, key, state as u32);
+                }
+                KeyboardEvent::Modifiers {
+                    mods_depressed,
+                    mods_latched,
+                    mods_locked,
+                    group,
+                } => {
+                    self.keyboard
+                        .modifiers(mods_depressed, mods_latched, mods_locked, group);
+                }
+            },
+            _ => {}
+        }
+        Ok(())
+    }
+}
+
+delegate_noop!(State: Vp);
+delegate_noop!(State: Vk);
+delegate_noop!(State: VpManager);
+delegate_noop!(State: VkManager);
+
+impl Dispatch<wl_registry::WlRegistry, GlobalListContents> for State {
+    fn event(
+        _: &mut State,
+        _: &wl_registry::WlRegistry,
+        _: wl_registry::Event,
+        _: &GlobalListContents,
+        _: &Connection,
+        _: &QueueHandle<State>,
+    ) {
+    }
+}
+
+impl Dispatch<WlKeyboard, ()> for State {
+    fn event(
+        state: &mut Self,
+        _: &WlKeyboard,
+        event: <WlKeyboard as wayland_client::Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        _: &QueueHandle<Self>,
+    ) {
+        if let wl_keyboard::Event::Keymap { format, fd, size } = event {
+            state.keymap = Some((u32::from(format), fd, size));
+        }
+    }
+}
+
+impl Dispatch<WlSeat, ()> for State {
+    fn event(
+        _: &mut Self,
+        seat: &WlSeat,
+        event: <WlSeat as wayland_client::Proxy>::Event,
+        _: &(),
+        _: &Connection,
+        qhandle: &QueueHandle<Self>,
+    ) {
+        if let wl_seat::Event::Capabilities {
+            capabilities: WEnum::Value(capabilities),
+        } = event
+        {
+            if capabilities.contains(wl_seat::Capability::Keyboard) {
+                seat.get_keyboard(qhandle, ());
+            }
+        }
+    }
+}

input-emulation/src/x11.rs

@@ -0,0 +1,155 @@
+use async_trait::async_trait;
+use std::ptr;
+use x11::{
+    xlib::{self, XCloseDisplay},
+    xtest,
+};
+
+use input_event::{
+    Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
+};
+
+use crate::error::EmulationError;
+
+use super::{error::X11EmulationCreationError, EmulationHandle, InputEmulation};
+
+pub struct X11Emulation {
+    display: *mut xlib::Display,
+}
+
+unsafe impl Send for X11Emulation {}
+
+impl X11Emulation {
+    pub fn new() -> Result<Self, X11EmulationCreationError> {
+        let display = unsafe {
+            match xlib::XOpenDisplay(ptr::null()) {
+                d if d == ptr::null::<xlib::Display>() as *mut xlib::Display => {
+                    Err(X11EmulationCreationError::OpenDisplay)
+                }
+                display => Ok(display),
+            }
+        }?;
+        Ok(Self { display })
+    }
+
+    fn relative_motion(&self, dx: i32, dy: i32) {
+        unsafe {
+            xtest::XTestFakeRelativeMotionEvent(self.display, dx, dy, 0, 0);
+        }
+    }
+
+    fn emulate_mouse_button(&self, button: u32, state: u32) {
+        unsafe {
+            let x11_button = match button {
+                BTN_RIGHT => 3,
+                BTN_MIDDLE => 2,
+                BTN_BACK => 8,
+                BTN_FORWARD => 9,
+                BTN_LEFT => 1,
+                _ => 1,
+            };
+            xtest::XTestFakeButtonEvent(self.display, x11_button, state as i32, 0);
+        };
+    }
+
+    const SCROLL_UP: u32 = 4;
+    const SCROLL_DOWN: u32 = 5;
+    const SCROLL_LEFT: u32 = 6;
+    const SCROLL_RIGHT: u32 = 7;
+
+    fn emulate_scroll(&self, axis: u8, value: f64) {
+        let direction = match axis {
+            1 => {
+                if value < 0.0 {
+                    Self::SCROLL_LEFT
+                } else {
+                    Self::SCROLL_RIGHT
+                }
+            }
+            _ => {
+                if value < 0.0 {
+                    Self::SCROLL_UP
+                } else {
+                    Self::SCROLL_DOWN
+                }
+            }
+        };
+
+        unsafe {
+            xtest::XTestFakeButtonEvent(self.display, direction, 1, 0);
+            xtest::XTestFakeButtonEvent(self.display, direction, 0, 0);
+        }
+    }
+
+    #[allow(dead_code)]
+    fn emulate_key(&self, key: u32, state: u8) {
+        let key = key + 8; // xorg keycodes are shifted by 8
+        unsafe {
+            xtest::XTestFakeKeyEvent(self.display, key, state as i32, 0);
+        }
+    }
+}
+
+impl Drop for X11Emulation {
+    fn drop(&mut self) {
+        unsafe {
+            XCloseDisplay(self.display);
+        }
+    }
+}
+
+#[async_trait]
+impl InputEmulation for X11Emulation {
+    async fn consume(&mut self, event: Event, _: EmulationHandle) -> Result<(), EmulationError> {
+        match event {
+            Event::Pointer(pointer_event) => match pointer_event {
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    self.relative_motion(dx as i32, dy as i32);
+                }
+                PointerEvent::Button {
+                    time: _,
+                    button,
+                    state,
+                } => {
+                    self.emulate_mouse_button(button, state);
+                }
+                PointerEvent::Axis {
+                    time: _,
+                    axis,
+                    value,
+                } => {
+                    self.emulate_scroll(axis, value);
+                }
+                PointerEvent::AxisDiscrete120 { axis, value } => {
+                    self.emulate_scroll(axis, value as f64);
+                }
+                PointerEvent::Frame {} => {}
+            },
+            Event::Keyboard(KeyboardEvent::Key {
+                time: _,
+                key,
+                state,
+            }) => {
+                self.emulate_key(key, state);
+            }
+            _ => {}
+        }
+        unsafe {
+            xlib::XFlush(self.display);
+        }
+        // FIXME
+        Ok(())
+    }
+
+    async fn create(&mut self, _: EmulationHandle) {
+        // for our purposes it does not matter what client sent the event
+    }
+
+    async fn destroy(&mut self, _: EmulationHandle) {
+        // for our purposes it does not matter what client sent the event
+    }
+
+    async fn terminate(&mut self) {
+        /* nothing to do */
+    }
+}

input-emulation/src/xdg_desktop_portal.rs

@@ -0,0 +1,167 @@
+use ashpd::{
+    desktop::{
+        remote_desktop::{Axis, DeviceType, KeyState, RemoteDesktop},
+        PersistMode, Session,
+    },
+    zbus::AsyncDrop,
+    WindowIdentifier,
+};
+use async_trait::async_trait;
+
+use futures::FutureExt;
+use input_event::{
+    Event::{Keyboard, Pointer},
+    KeyboardEvent, PointerEvent,
+};
+
+use crate::error::EmulationError;
+
+use super::{error::XdpEmulationCreationError, EmulationHandle, InputEmulation};
+
+pub struct DesktopPortalEmulation<'a> {
+    proxy: RemoteDesktop<'a>,
+    session: Session<'a, RemoteDesktop<'a>>,
+}
+
+impl<'a> DesktopPortalEmulation<'a> {
+    pub async fn new() -> Result<DesktopPortalEmulation<'a>, XdpEmulationCreationError> {
+        log::debug!("connecting to org.freedesktop.portal.RemoteDesktop portal ...");
+        let proxy = RemoteDesktop::new().await?;
+
+        // retry when user presses the cancel button
+        log::debug!("creating session ...");
+        let session = proxy.create_session().await?;
+
+        log::debug!("selecting devices ...");
+        proxy
+            .select_devices(
+                &session,
+                DeviceType::Keyboard | DeviceType::Pointer,
+                None,
+                PersistMode::ExplicitlyRevoked,
+            )
+            .await?;
+
+        log::info!("requesting permission for input emulation");
+        let _devices = proxy
+            .start(&session, &WindowIdentifier::default())
+            .await?
+            .response()?;
+
+        log::debug!("started session");
+        let session = session;
+
+        Ok(Self { proxy, session })
+    }
+}
+
+#[async_trait]
+impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
+    async fn consume(
+        &mut self,
+        event: input_event::Event,
+        _client: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        match event {
+            Pointer(p) => match p {
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    self.proxy
+                        .notify_pointer_motion(&self.session, dx, dy)
+                        .await?;
+                }
+                PointerEvent::Button {
+                    time: _,
+                    button,
+                    state,
+                } => {
+                    let state = match state {
+                        0 => KeyState::Released,
+                        _ => KeyState::Pressed,
+                    };
+                    self.proxy
+                        .notify_pointer_button(&self.session, button as i32, state)
+                        .await?;
+                }
+                PointerEvent::AxisDiscrete120 { axis, value } => {
+                    let axis = match axis {
+                        0 => Axis::Vertical,
+                        _ => Axis::Horizontal,
+                    };
+                    self.proxy
+                        .notify_pointer_axis_discrete(&self.session, axis, value / 120)
+                        .await?;
+                }
+                PointerEvent::Axis {
+                    time: _,
+                    axis,
+                    value,
+                } => {
+                    let axis = match axis {
+                        0 => Axis::Vertical,
+                        _ => Axis::Horizontal,
+                    };
+                    let (dx, dy) = match axis {
+                        Axis::Vertical => (0., value),
+                        Axis::Horizontal => (value, 0.),
+                    };
+                    self.proxy
+                        .notify_pointer_axis(&self.session, dx, dy, true)
+                        .await?;
+                }
+                PointerEvent::Frame {} => {}
+            },
+            Keyboard(k) => {
+                match k {
+                    KeyboardEvent::Key {
+                        time: _,
+                        key,
+                        state,
+                    } => {
+                        let state = match state {
+                            0 => KeyState::Released,
+                            _ => KeyState::Pressed,
+                        };
+                        self.proxy
+                            .notify_keyboard_keycode(&self.session, key as i32, state)
+                            .await?;
+                    }
+                    KeyboardEvent::Modifiers { .. } => {
+                        // ignore
+                    }
+                }
+            }
+            _ => {}
+        }
+        Ok(())
+    }
+
+    async fn create(&mut self, _client: EmulationHandle) {}
+    async fn destroy(&mut self, _client: EmulationHandle) {}
+    async fn terminate(&mut self) {
+        if let Err(e) = self.session.close().await {
+            log::warn!("session.close(): {e}");
+        };
+        if let Err(e) = self.session.receive_closed().await {
+            log::warn!("session.receive_closed(): {e}");
+        };
+    }
+}
+
+impl<'a> AsyncDrop for DesktopPortalEmulation<'a> {
+    #[doc = r" Perform the async cleanup."]
+    #[must_use]
+    #[allow(clippy::type_complexity, clippy::type_repetition_in_bounds)]
+    fn async_drop<'async_trait>(
+        self,
+    ) -> ::core::pin::Pin<
+        Box<dyn ::core::future::Future<Output = ()> + ::core::marker::Send + 'async_trait>,
+    >
+    where
+        Self: 'async_trait,
+    {
+        async move {
+            let _ = self.session.close().await;
+        }
+        .boxed()
+    }
+}

input-event/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "input-event"
+description = "cross-platform input-event types for input-capture / input-emulation"
+version = "0.2.1"
+edition = "2021"
+license = "GPL-3.0-or-later"
+repository = "https://github.com/feschber/lan-mouse"
+
+[dependencies]
+futures-core = "0.3.30"
+log = "0.4.22"
+num_enum = "0.7.2"
+serde = { version = "1.0", features = ["derive"] }
+thiserror = "1.0.61"
+
+[target.'cfg(all(unix, not(target_os="macos")))'.dependencies]
+reis = { version = "0.2.0", optional = true }
+
+[features]
+default = ["libei"]
+libei = ["dep:reis"]

input-event/src/error.rs

@@ -0,0 +1,17 @@
+use std::array::TryFromSliceError;
+
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ProtocolError {
+    #[error(transparent)]
+    MissingData(#[from] TryFromSliceError),
+    #[error("invalid event id: `{0}`")]
+    InvalidEventId(u8),
+    #[error("invalid pointer event type: `{0}`")]
+    InvalidPointerEventId(u8),
+    #[error("invalid keyboard event type: `{0}`")]
+    InvalidKeyboardEventId(u8),
+    #[error("expected data at idx `{0:?}`")]
+    Data(String),
+}

input-event/src/lib.rs

@@ -0,0 +1,146 @@
+pub use error::ProtocolError;
+use std::fmt::{self, Display};
+
+pub mod error;
+pub mod proto;
+pub mod scancode;
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+mod libei;
+
+// FIXME
+pub const BTN_LEFT: u32 = 0x110;
+pub const BTN_RIGHT: u32 = 0x111;
+pub const BTN_MIDDLE: u32 = 0x112;
+pub const BTN_BACK: u32 = 0x113;
+pub const BTN_FORWARD: u32 = 0x114;
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub enum PointerEvent {
+    /// relative motion event
+    Motion { time: u32, dx: f64, dy: f64 },
+    /// mouse button event
+    Button { time: u32, button: u32, state: u32 },
+    /// axis event, scroll event for touchpads
+    Axis { time: u32, axis: u8, value: f64 },
+    /// discrete axis event, scroll event for mice - 120 = one scroll tick
+    AxisDiscrete120 { axis: u8, value: i32 },
+    /// frame event
+    Frame {},
+}
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub enum KeyboardEvent {
+    /// a key press / release event
+    Key { time: u32, key: u32, state: u8 },
+    /// modifiers changed state
+    Modifiers {
+        mods_depressed: u32,
+        mods_latched: u32,
+        mods_locked: u32,
+        group: u32,
+    },
+}
+
+#[derive(PartialEq, Debug, Clone, Copy)]
+pub enum Event {
+    /// pointer event (motion / button / axis)
+    Pointer(PointerEvent),
+    /// keyboard events (key / modifiers)
+    Keyboard(KeyboardEvent),
+    /// enter event: request to enter a client.
+    /// The client must release the pointer if it is grabbed
+    /// and reply with a leave event, as soon as its ready to
+    /// receive events
+    Enter(),
+    /// leave event: this client is now ready to receive events and will
+    /// not send any events after until it sends an enter event
+    Leave(),
+    /// ping a client, to see if it is still alive. A client that does
+    /// not respond with a pong event will be assumed to be offline.
+    Ping(),
+    /// response to a ping event: this event signals that a client
+    /// is still alive but must otherwise be ignored
+    Pong(),
+    /// explicit disconnect request. The client will no longer
+    /// send events until the next Enter event. All of its keys should be released.
+    Disconnect(),
+}
+
+impl Display for PointerEvent {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            PointerEvent::Motion { time: _, dx, dy } => write!(f, "motion({dx},{dy})"),
+            PointerEvent::Button {
+                time: _,
+                button,
+                state,
+            } => {
+                let str = match *button {
+                    BTN_LEFT => Some("left"),
+                    BTN_RIGHT => Some("right"),
+                    BTN_MIDDLE => Some("middle"),
+                    BTN_FORWARD => Some("forward"),
+                    BTN_BACK => Some("back"),
+                    _ => None,
+                };
+                if let Some(button) = str {
+                    write!(f, "button({button}, {state})")
+                } else {
+                    write!(f, "button({button}, {state}")
+                }
+            }
+            PointerEvent::Axis {
+                time: _,
+                axis,
+                value,
+            } => write!(f, "scroll({axis}, {value})"),
+            PointerEvent::AxisDiscrete120 { axis, value } => {
+                write!(f, "scroll-120 ({axis}, {value})")
+            }
+            PointerEvent::Frame {} => write!(f, "frame()"),
+        }
+    }
+}
+
+impl Display for KeyboardEvent {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            KeyboardEvent::Key {
+                time: _,
+                key,
+                state,
+            } => {
+                let scan = scancode::Linux::try_from(*key);
+                if let Ok(scan) = scan {
+                    write!(f, "key({scan:?}, {state})")
+                } else {
+                    write!(f, "key({key}, {state})")
+                }
+            }
+            KeyboardEvent::Modifiers {
+                mods_depressed,
+                mods_latched,
+                mods_locked,
+                group,
+            } => write!(
+                f,
+                "modifiers({mods_depressed},{mods_latched},{mods_locked},{group})"
+            ),
+        }
+    }
+}
+
+impl Display for Event {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Event::Pointer(p) => write!(f, "{}", p),
+            Event::Keyboard(k) => write!(f, "{}", k),
+            Event::Enter() => write!(f, "enter"),
+            Event::Leave() => write!(f, "leave"),
+            Event::Ping() => write!(f, "ping"),
+            Event::Pong() => write!(f, "pong"),
+            Event::Disconnect() => write!(f, "disconnect"),
+        }
+    }
+}

input-event/src/libei.rs

@@ -0,0 +1,146 @@
+use reis::{
+    ei::{button::ButtonState, keyboard::KeyState},
+    event::EiEvent,
+};
+
+use crate::{Event, KeyboardEvent, PointerEvent};
+
+impl Event {
+    pub fn from_ei_event(ei_event: EiEvent) -> impl Iterator<Item = Self> {
+        to_input_events(ei_event).into_iter()
+    }
+}
+
+enum Events {
+    None,
+    One(Event),
+    Two(Event, Event),
+}
+
+impl Events {
+    fn into_iter(self) -> impl Iterator<Item = Event> {
+        EventIterator::new(self)
+    }
+}
+
+struct EventIterator {
+    events: [Option<Event>; 2],
+    pos: usize,
+}
+
+impl EventIterator {
+    fn new(events: Events) -> Self {
+        let events = match events {
+            Events::None => [None, None],
+            Events::One(e) => [Some(e), None],
+            Events::Two(e, f) => [Some(e), Some(f)],
+        };
+        Self { events, pos: 0 }
+    }
+}
+
+impl Iterator for EventIterator {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let res = if self.pos >= self.events.len() {
+            None
+        } else {
+            self.events[self.pos]
+        };
+        self.pos += 1;
+        res
+    }
+}
+
+fn to_input_events(ei_event: EiEvent) -> Events {
+    match ei_event {
+        EiEvent::KeyboardModifiers(mods) => {
+            let modifier_event = KeyboardEvent::Modifiers {
+                mods_depressed: mods.depressed,
+                mods_latched: mods.latched,
+                mods_locked: mods.locked,
+                group: mods.group,
+            };
+            Events::One(Event::Keyboard(modifier_event))
+        }
+        EiEvent::Frame(_) => Events::None, /* FIXME */
+        EiEvent::PointerMotion(motion) => {
+            let motion_event = PointerEvent::Motion {
+                time: motion.time as u32,
+                dx: motion.dx as f64,
+                dy: motion.dy as f64,
+            };
+            Events::One(Event::Pointer(motion_event))
+        }
+        EiEvent::PointerMotionAbsolute(_) => Events::None,
+        EiEvent::Button(button) => {
+            let button_event = PointerEvent::Button {
+                time: button.time as u32,
+                button: button.button,
+                state: match button.state {
+                    ButtonState::Released => 0,
+                    ButtonState::Press => 1,
+                },
+            };
+            Events::One(Event::Pointer(button_event))
+        }
+        EiEvent::ScrollDelta(delta) => {
+            let dy = Event::Pointer(PointerEvent::Axis {
+                time: 0,
+                axis: 0,
+                value: delta.dy as f64,
+            });
+            let dx = Event::Pointer(PointerEvent::Axis {
+                time: 0,
+                axis: 1,
+                value: delta.dx as f64,
+            });
+            if delta.dy != 0. && delta.dx != 0. {
+                Events::Two(dy, dx)
+            } else if delta.dy != 0. {
+                Events::One(dy)
+            } else if delta.dx != 0. {
+                Events::One(dx)
+            } else {
+                Events::None
+            }
+        }
+        EiEvent::ScrollStop(_) => Events::None,   /* TODO */
+        EiEvent::ScrollCancel(_) => Events::None, /* TODO */
+        EiEvent::ScrollDiscrete(scroll) => {
+            let dy = Event::Pointer(PointerEvent::AxisDiscrete120 {
+                axis: 0,
+                value: scroll.discrete_dy,
+            });
+            let dx = Event::Pointer(PointerEvent::AxisDiscrete120 {
+                axis: 1,
+                value: scroll.discrete_dx,
+            });
+            if scroll.discrete_dy != 0 && scroll.discrete_dx != 0 {
+                Events::Two(dy, dx)
+            } else if scroll.discrete_dy != 0 {
+                Events::One(dy)
+            } else if scroll.discrete_dx != 0 {
+                Events::One(dx)
+            } else {
+                Events::None
+            }
+        }
+        EiEvent::KeyboardKey(key) => {
+            let key_event = KeyboardEvent::Key {
+                key: key.key,
+                state: match key.state {
+                    KeyState::Press => 1,
+                    KeyState::Released => 0,
+                },
+                time: key.time as u32,
+            };
+            Events::One(Event::Keyboard(key_event))
+        }
+        EiEvent::TouchDown(_) => Events::None,   /* TODO */
+        EiEvent::TouchUp(_) => Events::None,     /* TODO */
+        EiEvent::TouchMotion(_) => Events::None, /* TODO */
+        _ => Events::None,
+    }
+}

input-event/src/proto.rs

@@ -0,0 +1,307 @@
+use std::{fmt::Debug, slice::SliceIndex};
+
+use crate::ProtocolError;
+
+use super::{Event, KeyboardEvent, PointerEvent};
+
+enum PointerEventType {
+    Motion,
+    Button,
+    Axis,
+    AxisDiscrete120,
+    Frame,
+}
+
+enum KeyboardEventType {
+    Key,
+    Modifiers,
+}
+
+enum EventType {
+    Pointer,
+    Keyboard,
+    Enter,
+    Leave,
+    Ping,
+    Pong,
+    Disconnect,
+}
+
+impl Event {
+    fn event_type(&self) -> EventType {
+        match self {
+            Self::Pointer(_) => EventType::Pointer,
+            Self::Keyboard(_) => EventType::Keyboard,
+            Self::Enter() => EventType::Enter,
+            Self::Leave() => EventType::Leave,
+            Self::Ping() => EventType::Ping,
+            Self::Pong() => EventType::Pong,
+            Self::Disconnect() => EventType::Disconnect,
+        }
+    }
+}
+
+impl PointerEvent {
+    fn event_type(&self) -> PointerEventType {
+        match self {
+            Self::Motion { .. } => PointerEventType::Motion,
+            Self::Button { .. } => PointerEventType::Button,
+            Self::Axis { .. } => PointerEventType::Axis,
+            Self::AxisDiscrete120 { .. } => PointerEventType::AxisDiscrete120,
+            Self::Frame { .. } => PointerEventType::Frame,
+        }
+    }
+}
+
+impl KeyboardEvent {
+    fn event_type(&self) -> KeyboardEventType {
+        match self {
+            KeyboardEvent::Key { .. } => KeyboardEventType::Key,
+            KeyboardEvent::Modifiers { .. } => KeyboardEventType::Modifiers,
+        }
+    }
+}
+
+impl TryFrom<u8> for PointerEventType {
+    type Error = ProtocolError;
+
+    fn try_from(value: u8) -> Result<Self, ProtocolError> {
+        match value {
+            x if x == Self::Motion as u8 => Ok(Self::Motion),
+            x if x == Self::Button as u8 => Ok(Self::Button),
+            x if x == Self::Axis as u8 => Ok(Self::Axis),
+            x if x == Self::AxisDiscrete120 as u8 => Ok(Self::AxisDiscrete120),
+            x if x == Self::Frame as u8 => Ok(Self::Frame),
+            _ => Err(ProtocolError::InvalidPointerEventId(value)),
+        }
+    }
+}
+
+impl TryFrom<u8> for KeyboardEventType {
+    type Error = ProtocolError;
+
+    fn try_from(value: u8) -> Result<Self, ProtocolError> {
+        match value {
+            x if x == Self::Key as u8 => Ok(Self::Key),
+            x if x == Self::Modifiers as u8 => Ok(Self::Modifiers),
+            _ => Err(ProtocolError::InvalidKeyboardEventId(value)),
+        }
+    }
+}
+
+impl From<&Event> for Vec<u8> {
+    fn from(event: &Event) -> Self {
+        let event_id = vec![event.event_type() as u8];
+        let event_data = match event {
+            Event::Pointer(p) => p.into(),
+            Event::Keyboard(k) => k.into(),
+            Event::Enter() => vec![],
+            Event::Leave() => vec![],
+            Event::Ping() => vec![],
+            Event::Pong() => vec![],
+            Event::Disconnect() => vec![],
+        };
+        [event_id, event_data].concat()
+    }
+}
+
+impl TryFrom<Vec<u8>> for Event {
+    type Error = ProtocolError;
+
+    fn try_from(value: Vec<u8>) -> Result<Self, ProtocolError> {
+        let event_id = u8::from_be_bytes(value[..1].try_into()?);
+        match event_id {
+            i if i == (EventType::Pointer as u8) => Ok(Event::Pointer(value.try_into()?)),
+            i if i == (EventType::Keyboard as u8) => Ok(Event::Keyboard(value.try_into()?)),
+            i if i == (EventType::Enter as u8) => Ok(Event::Enter()),
+            i if i == (EventType::Leave as u8) => Ok(Event::Leave()),
+            i if i == (EventType::Ping as u8) => Ok(Event::Ping()),
+            i if i == (EventType::Pong as u8) => Ok(Event::Pong()),
+            i if i == (EventType::Disconnect as u8) => Ok(Event::Disconnect()),
+            _ => Err(ProtocolError::InvalidEventId(event_id)),
+        }
+    }
+}
+
+impl From<&PointerEvent> for Vec<u8> {
+    fn from(event: &PointerEvent) -> Self {
+        let id = vec![event.event_type() as u8];
+        let data = match event {
+            PointerEvent::Motion { time, dx, dy } => {
+                let time = time.to_be_bytes();
+                let dx = dx.to_be_bytes();
+                let dy = dy.to_be_bytes();
+                [&time[..], &dx[..], &dy[..]].concat()
+            }
+            PointerEvent::Button {
+                time,
+                button,
+                state,
+            } => {
+                let time = time.to_be_bytes();
+                let button = button.to_be_bytes();
+                let state = state.to_be_bytes();
+                [&time[..], &button[..], &state[..]].concat()
+            }
+            PointerEvent::Axis { time, axis, value } => {
+                let time = time.to_be_bytes();
+                let axis = axis.to_be_bytes();
+                let value = value.to_be_bytes();
+                [&time[..], &axis[..], &value[..]].concat()
+            }
+            PointerEvent::AxisDiscrete120 { axis, value } => {
+                let axis = axis.to_be_bytes();
+                let value = value.to_be_bytes();
+                [&axis[..], &value[..]].concat()
+            }
+            PointerEvent::Frame {} => {
+                vec![]
+            }
+        };
+        [id, data].concat()
+    }
+}
+
+fn decode_u8<I>(data: &[u8], idx: I) -> Result<u8, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(u8::from_be_bytes(data.try_into()?))
+}
+
+fn decode_u32<I>(data: &[u8], idx: I) -> Result<u32, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(u32::from_be_bytes(data.try_into()?))
+}
+
+fn decode_i32<I>(data: &[u8], idx: I) -> Result<i32, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(i32::from_be_bytes(data.try_into()?))
+}
+fn decode_f64<I>(data: &[u8], idx: I) -> Result<f64, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(f64::from_be_bytes(data.try_into()?))
+}
+
+impl TryFrom<Vec<u8>> for PointerEvent {
+    type Error = ProtocolError;
+
+    fn try_from(data: Vec<u8>) -> Result<Self, ProtocolError> {
+        match data.get(1) {
+            Some(id) => match id.to_owned().try_into()? {
+                PointerEventType::Motion => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let dx = decode_f64(&data, 6..14)?;
+                    let dy = decode_f64(&data, 14..22)?;
+
+                    Ok(Self::Motion { time, dx, dy })
+                }
+                PointerEventType::Button => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let button = decode_u32(&data, 6..10)?;
+                    let state = decode_u32(&data, 10..14)?;
+
+                    Ok(Self::Button {
+                        time,
+                        button,
+                        state,
+                    })
+                }
+                PointerEventType::Axis => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let axis = decode_u8(&data, 6..7)?;
+                    let value = decode_f64(&data, 7..15)?;
+                    Ok(Self::Axis { time, axis, value })
+                }
+                PointerEventType::AxisDiscrete120 => {
+                    let axis = decode_u8(&data, 2..3)?;
+                    let value = decode_i32(&data, 3..7)?;
+                    Ok(Self::AxisDiscrete120 { axis, value })
+                }
+                PointerEventType::Frame => Ok(Self::Frame {}),
+            },
+            None => Err(ProtocolError::Data("0".to_string())),
+        }
+    }
+}
+
+impl From<&KeyboardEvent> for Vec<u8> {
+    fn from(event: &KeyboardEvent) -> Self {
+        let id = vec![event.event_type() as u8];
+        let data = match event {
+            KeyboardEvent::Key { time, key, state } => {
+                let time = time.to_be_bytes();
+                let key = key.to_be_bytes();
+                let state = state.to_be_bytes();
+                [&time[..], &key[..], &state[..]].concat()
+            }
+            KeyboardEvent::Modifiers {
+                mods_depressed,
+                mods_latched,
+                mods_locked,
+                group,
+            } => {
+                let mods_depressed = mods_depressed.to_be_bytes();
+                let mods_latched = mods_latched.to_be_bytes();
+                let mods_locked = mods_locked.to_be_bytes();
+                let group = group.to_be_bytes();
+                [
+                    &mods_depressed[..],
+                    &mods_latched[..],
+                    &mods_locked[..],
+                    &group[..],
+                ]
+                .concat()
+            }
+        };
+        [id, data].concat()
+    }
+}
+
+impl TryFrom<Vec<u8>> for KeyboardEvent {
+    type Error = ProtocolError;
+
+    fn try_from(data: Vec<u8>) -> Result<Self, ProtocolError> {
+        match data.get(1) {
+            Some(id) => match id.to_owned().try_into()? {
+                KeyboardEventType::Key => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let key = decode_u32(&data, 6..10)?;
+                    let state = decode_u8(&data, 10..11)?;
+                    Ok(KeyboardEvent::Key { time, key, state })
+                }
+                KeyboardEventType::Modifiers => {
+                    let mods_depressed = decode_u32(&data, 2..6)?;
+                    let mods_latched = decode_u32(&data, 6..10)?;
+                    let mods_locked = decode_u32(&data, 10..14)?;
+                    let group = decode_u32(&data, 14..18)?;
+                    Ok(KeyboardEvent::Modifiers {
+                        mods_depressed,
+                        mods_latched,
+                        mods_locked,
+                        group,
+                    })
+                }
+            },
+            None => Err(ProtocolError::Data("0".to_string())),
+        }
+    }
+}

input-event/src/scancode.rs

@@ -0,0 +1,851 @@
+use num_enum::TryFromPrimitive;
+use serde::{Deserialize, Serialize};
+
+/*
+ * https://learn.microsoft.com/en-us/windows/win32/inputdev/about-keyboard-input
+ * https://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/translate.pdf
+ * https://kbd-project.org/docs/scancodes/scancodes-1.html
+ */
+#[repr(u32)]
+#[derive(Debug, Clone, Copy, TryFromPrimitive)]
+pub enum Windows {
+    Shutdown = 0xE05E,
+    SystemSleep = 0xE05F,
+    SystemWakeUp = 0xE063,
+    ErrorRollOver = 0x00FF,
+    KeyA = 0x001E,
+    KeyB = 0x0030,
+    KeyC = 0x002E,
+    KeyD = 0x0020,
+    KeyE = 0x0012,
+    KeyF = 0x0021,
+    KeyG = 0x0022,
+    KeyH = 0x0023,
+    KeyI = 0x0017,
+    KeyJ = 0x0024,
+    KeyK = 0x0025,
+    KeyL = 0x0026,
+    KeyM = 0x0032,
+    KeyN = 0x0031,
+    KeyO = 0x0018,
+    KeyP = 0x0019,
+    KeyQ = 0x0010,
+    KeyR = 0x0013,
+    KeyS = 0x001F,
+    KeyT = 0x0014,
+    KeyU = 0x0016,
+    KeyV = 0x002F,
+    KeyW = 0x0011,
+    KeyX = 0x002D,
+    KeyY = 0x0015,
+    KeyZ = 0x002C,
+    Key1 = 0x0002,
+    Key2 = 0x0003,
+    Key3 = 0x0004,
+    Key4 = 0x0005,
+    Key5 = 0x0006,
+    Key6 = 0x0007,
+    Key7 = 0x0008,
+    Key8 = 0x0009,
+    Key9 = 0x000A,
+    Key0 = 0x000B,
+    KeyEnter = 0x001C,
+    KeyEsc = 0x0001,
+    KeyDelete = 0x000E,
+    KeyTab = 0x000F,
+    KeySpace = 0x0039,
+    KeyMinus = 0x000C,
+    KeyEqual = 0x000D,
+    KeyLeftBrace = 0x001A,
+    KeyRightBrace = 0x001B,
+    KeyBackslash = 0x002B,
+    KeySemiColon = 0x0027,
+    KeyApostrophe = 0x0028,
+    KeyGrave = 0x0029,
+    KeyComma = 0x0033,
+    KeyDot = 0x0034,
+    KeySlash = 0x0035,
+    KeyCapsLock = 0x003A,
+    KeyF1 = 0x003B,
+    KeyF2 = 0x003C,
+    KeyF3 = 0x003D,
+    KeyF4 = 0x003E,
+    KeyF5 = 0x003F,
+    KeyF6 = 0x0040,
+    KeyF7 = 0x0041,
+    KeyF8 = 0x0042,
+    KeyF9 = 0x0043,
+    KeyF10 = 0x0044,
+    KeyF11 = 0x0057,
+    KeyF12 = 0x0058,
+    KeyPrintScreen = 0xE037,
+    KeyScrollLock = 0x0046,
+    KeyPause = 0xE11D45,
+    KeyInsert = 0xE052,
+    KeyHome = 0xE047,
+    KeyPageUp = 0xE049,
+    KeyDeleteForward = 0xE053,
+    KeyEnd = 0xE04F,
+    KeyPageDown = 0xE051,
+    KeyRight = 0xE04D,
+    KeyLeft = 0xE04B,
+    KeyDown = 0xE050,
+    KeyUp = 0xE048,
+    KeypadNumLock = 0x0045,
+    KeypadSlash = 0xE035,
+    KeypadStar = 0x0037,
+    KeypadDash = 0x004A,
+    KeypadPlus = 0x004E,
+    KeypadEnter = 0xE01C,
+    Keypad1End = 0x004F,
+    Keypad2DownArrow = 0x0050,
+    Keypad3PageDn = 0x0051,
+    Keypad4LeftArrow = 0x004B,
+    Keypad5 = 0x004C,
+    Keypad6RightArrow = 0x004D,
+    Keypad7Home = 0x0047,
+    Keypad8UpArrow = 0x0048,
+    Keypad9PageUp = 0x0049,
+    Keypad0Insert = 0x0052,
+    KeypadDot = 0x0053,
+    KeyNonUSSlashBar = 0x0056,
+    KeyApplication = 0xE05D,
+    KeypadEquals = 0x0059,
+    KeyF13 = 0x0064,
+    KeyF14 = 0x0065,
+    KeyF15 = 0x0066,
+    KeyF16 = 0x0067,
+    KeyF17 = 0x0068,
+    KeyF18 = 0x0069,
+    KeyF19 = 0x006A,
+    KeyF20 = 0x006B,
+    KeyF21 = 0x006C,
+    KeyF22 = 0x006D,
+    KeyF23 = 0x006E,
+    KeyF24 = 0x0076, // KeyLANG5
+    KeypadComma = 0x007E,
+    KeyInternational1 = 0x0073,
+    KeyInternational2 = 0x0070,
+    KeyInternational3 = 0x007D, // typo in doc -> its Int'l 3 not Int'l 2
+    #[allow(dead_code)]
+    KeyInternational4 = 0x0079,
+    #[allow(dead_code)]
+    KeyInternational5 = 0x007B,
+    // KeyInternational6 = 0x005C,
+    KeyLANG1 = 0x0072,
+    KeyLANG2 = 0x0071,
+    KeyLANG3 = 0x0078,
+    KeyLANG4 = 0x0077,
+    // KeyLANG5 = 0x0076,
+    KeyLeftCtrl = 0x001D,
+    KeyLeftShift = 0x002A,
+    KeyLeftAlt = 0x0038,
+    KeyLeftGUI = 0xE05B,
+    KeyRightCtrl = 0xE01D,
+    KeyRightShift = 0x0036,
+    KeyFakeRightShift = 0xE036,
+    KeyRightAlt = 0xE038,
+    KeyRightGUI = 0xE05C,
+    KeyScanNextTrack = 0xE019,
+    KeyScanPreviousTrack = 0xE010,
+    KeyStop = 0xE024,
+    KeyPlayPause = 0xE022,
+    KeyMute = 0xE020,
+    KeyVolumeUp = 0xE030,
+    KeyVolumeDown = 0xE02E,
+    #[allow(dead_code)]
+    ALConsumerControlConfiguration = 0xE06D, // TODO Unused
+    ALEmailReader = 0xE06C,
+    ALCalculator = 0xE021,
+    ALLocalMachineBrowser = 0xE06B,
+    ACSearch = 0xE065,
+    ACHome = 0xE032,
+    ACBack = 0xE06A,
+    ACForward = 0xE069,
+    ACStop = 0xE068,
+    ACRefresh = 0xE067,
+    ACBookmarks = 0xE066,
+}
+
+/*
+ * https://github.com/torvalds/linux/blob/master/include/uapi/linux/input-event-codes.h
+ */
+#[repr(u32)]
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, Eq, Hash, PartialEq, TryFromPrimitive)]
+#[allow(dead_code)]
+pub enum Linux {
+    KeyReserved = 0,
+    KeyEsc = 1,
+    Key1 = 2,
+    Key2 = 3,
+    Key3 = 4,
+    Key4 = 5,
+    Key5 = 6,
+    Key6 = 7,
+    Key7 = 8,
+    Key8 = 9,
+    Key9 = 10,
+    Key0 = 11,
+    KeyMinus = 12,
+    KeyEqual = 13,
+    KeyBackspace = 14,
+    KeyTab = 15,
+    KeyQ = 16,
+    KeyW = 17,
+    KeyE = 18,
+    KeyR = 19,
+    KeyT = 20,
+    KeyY = 21,
+    KeyU = 22,
+    KeyI = 23,
+    KeyO = 24,
+    KeyP = 25,
+    KeyLeftbrace = 26,
+    KeyRightbrace = 27,
+    KeyEnter = 28,
+    KeyLeftCtrl = 29,
+    KeyA = 30,
+    KeyS = 31,
+    KeyD = 32,
+    KeyF = 33,
+    KeyG = 34,
+    KeyH = 35,
+    KeyJ = 36,
+    KeyK = 37,
+    KeyL = 38,
+    KeySemicolon = 39,
+    KeyApostrophe = 40,
+    KeyGrave = 41,
+    KeyLeftShift = 42,
+    KeyBackslash = 43,
+    KeyZ = 44,
+    KeyX = 45,
+    KeyC = 46,
+    KeyV = 47,
+    KeyB = 48,
+    KeyN = 49,
+    KeyM = 50,
+    KeyComma = 51,
+    KeyDot = 52,
+    KeySlash = 53,
+    KeyRightShift = 54,
+    KeyKpAsterisk = 55,
+    KeyLeftAlt = 56,
+    KeySpace = 57,
+    KeyCapsLock = 58,
+    KeyF1 = 59,
+    KeyF2 = 60,
+    KeyF3 = 61,
+    KeyF4 = 62,
+    KeyF5 = 63,
+    KeyF6 = 64,
+    KeyF7 = 65,
+    KeyF8 = 66,
+    KeyF9 = 67,
+    KeyF10 = 68,
+    KeyNumlock = 69,
+    KeyScrollLock = 70,
+    KeyKp7 = 71,
+    KeyKp8 = 72,
+    KeyKp9 = 73,
+    KeyKpMinus = 74,
+    KeyKp4 = 75,
+    KeyKp5 = 76,
+    KeyKp6 = 77,
+    KeyKpplus = 78,
+    KeyKp1 = 79,
+    KeyKp2 = 80,
+    KeyKp3 = 81,
+    KeyKp0 = 82,
+    KeyKpDot = 83,
+    Invalid = 84,
+    KeyZenkakuhankaku = 85,
+    Key102nd = 86,
+    KeyF11 = 87,
+    KeyF12 = 88,
+    KeyRo = 89,
+    KeyKatakana = 90,
+    KeyHiragana = 91,
+    KeyHenkan = 92,
+    KeyKatakanahiragana = 93,
+    KeyMuhenkan = 94,
+    KeyKpJpComma = 95,
+    KeyKpEnter = 96,
+    KeyRightCtrl = 97,
+    KeyKpslash = 98,
+    KeySysrq = 99,
+    KeyRightalt = 100,
+    KeyLinefeed = 101,
+    KeyHome = 102,
+    KeyUp = 103,
+    KeyPageup = 104,
+    KeyLeft = 105,
+    KeyRight = 106,
+    KeyEnd = 107,
+    KeyDown = 108,
+    KeyPagedown = 109,
+    KeyInsert = 110,
+    KeyDelete = 111,
+    KeyMacro = 112,
+    KeyMute = 113,
+    KeyVolumeDown = 114,
+    KeyVolumeUp = 115,
+    KeyPower = 116, /* SC System Power Down */
+    KeyKpequal = 117,
+    KeyKpplusminus = 118,
+    KeyPause = 119,
+    KeyScale = 120, /* AL Compiz Scale (Expose) */
+    KeyKpcomma = 121,
+    KeyHanguel = 122,
+    // KEY_HANGUEL = KeyHangeul,
+    KeyHanja = 123,
+    KeyYen = 124,
+    KeyLeftMeta = 125,
+    KeyRightmeta = 126,
+    KeyCompose = 127,
+    KeyStop = 128, /* AC Stop */
+    KeyAgain = 129,
+    KeyProps = 130, /* AC Properties */
+    KeyUndo = 131,  /* AC Undo */
+    KeyFront = 132,
+    KeyCopy = 133,  /* AC Copy */
+    KeyOpen = 134,  /* AC Open */
+    KeyPaste = 135, /* AC Paste */
+    KeyFind = 136,  /* AC Search */
+    KeyCut = 137,   /* AC Cut */
+    KeyHelp = 138,  /* AL Integrated Help Center */
+    KeyMenu = 139,  /* Menu (show menu) */
+    KeyCalc = 140,  /* AL Calculator */
+    KeySetup = 141,
+    KeySleep = 142,  /* SC System Sleep */
+    KeyWakeup = 143, /* System Wake Up */
+    KeyFile = 144,   /* AL Local Machine Browser */
+    KeySendfile = 145,
+    KeyDeletefile = 146,
+    KeyXfer = 147,
+    KeyProg1 = 148,
+    KeyProg2 = 149,
+    KeyWww = 150, /* AL Internet Browser */
+    KeyMsdos = 151,
+    KeyCoffee = 152, /* AL Terminal Lock/Screensaver */
+    // KEY_SCREENLOCK = KeyCoffee,
+    KeyRotateDisplay = 153, /* Display orientation for e.g. tablets */
+    // KEY_DIRECTION = KeyRotateDisplay,
+    KeyCyclewindows = 154,
+    KeyMail = 155,
+    KeyBookmarks = 156, /* AC Bookmarks */
+    KeyComputer = 157,
+    KeyBack = 158,    /* AC Back */
+    KeyForward = 159, /* AC Forward */
+    KeyClosecd = 160,
+    KeyEjectcd = 161,
+    KeyEjectclosecd = 162,
+    KeyNextsong = 163,
+    KeyPlaypause = 164,
+    KeyPrevioussong = 165,
+    KeyStopcd = 166,
+    KeyRecord = 167,
+    KeyRewind = 168,
+    KeyPhone = 169, /* Media Select Telephone */
+    KeyIso = 170,
+    KeyConfig = 171,   /* AL Consumer Control Configuration */
+    KeyHomepage = 172, /* AC Home */
+    KeyRefresh = 173,  /* AC Refresh */
+    KeyExit = 174,     /* AC Exit */
+    KeyMove = 175,
+    KeyEdit = 176,
+    KeyScrollup = 177,
+    KeyScrolldown = 178,
+    KeyKpleftparen = 179,
+    KeyKprightparen = 180,
+    KeyNew = 181,  /* AC New */
+    KeyRedo = 182, /* AC Redo/Repeat */
+    KeyF13 = 183,
+    KeyF14 = 184,
+    KeyF15 = 185,
+    KeyF16 = 186,
+    KeyF17 = 187,
+    KeyF18 = 188,
+    KeyF19 = 189,
+    KeyF20 = 190,
+    KeyF21 = 191,
+    KeyF22 = 192,
+    KeyF23 = 193,
+    KeyF24 = 194,
+    Invalid1 = 195,
+    Invalid2 = 196,
+    Invalid3 = 197,
+    Invalid4 = 198,
+    Invalid5 = 199,
+    KeyPlaycd = 200,
+    KeyPausecd = 201,
+    KeyProg3 = 202,
+    KeyProg4 = 203,
+    KeyAllApplications = 204, /* AC Desktop Show All Applications */
+    // KEY_DASHBOARD = KeyAllApplications,
+    KeySuspend = 205,
+    KeyClose = 206, /* AC Close */
+    KeyPlay = 207,
+    KeyFastforward = 208,
+    KeyBassboost = 209,
+    KeyPrint = 210, /* AC Print */
+    KeyHp = 211,
+    KeyCamera = 212,
+    KeySound = 213,
+    KeyQuestion = 214,
+    KeyEmail = 215,
+    KeyChat = 216,
+    KeySearch = 217,
+    KeyConnect = 218,
+    KeyFinance = 219, /* AL Checkbook/Finance */
+    KeySport = 220,
+    KeyShop = 221,
+    KeyAlterase = 222,
+    KeyCancel = 223, /* AC Cancel */
+    KeyBrightnessdown = 224,
+    KeyBrightnessup = 225,
+    KeyMedia = 226,
+    KeySwitchvideomode = 227, /* Cycle between available video, outputs (Monitor/LCD/TV-out/etc) */
+    KeyKbdillumtoggle = 228,
+    KeyKbdillumdown = 229,
+    KeyKbdillumup = 230,
+    KeySend = 231,        /* AC Send */
+    KeyReply = 232,       /* AC Reply */
+    KeyForwardmail = 233, /* AC Forward Msg */
+    KeySave = 234,        /* AC Save */
+    KeyDocuments = 235,
+    KeyBattery = 236,
+    KeyBluetooth = 237,
+    KeyWlan = 238,
+    KeyUwb = 239,
+    KeyUnknown = 240,
+    KeyVideoNext = 241,       /* drive next video source */
+    KeyVideoPrev = 242,       /* drive previous video source */
+    KeyBrightnessCycle = 243, /* brightness up, after max is min */
+    KeyBrightnessAuto = 244, /* Set Auto Brightness: manual, brightness control is off, rely on ambient */
+    // KEY_BRIGHTNESS_ZERO=KeyBrightnessAuto,
+    KeyDisplayOff = 245, /* display device to off state */
+    KeyWwan = 246,       /* Wireless WAN (LTE, UMTS, GSM, etc.) */
+    // KEY_WIMAX =	KeyWwan,
+    KeyRfkill = 247,  /* Key that controls all radios */
+    KeyMicmute = 248, /* Mute / unmute the microphone */
+    KeyCount = 249,
+}
+
+impl TryFrom<Linux> for Windows {
+    type Error = ();
+
+    fn try_from(value: Linux) -> Result<Self, Self::Error> {
+        match value {
+            Linux::KeyReserved => Err(()),
+            Linux::KeyEsc => Ok(Self::KeyEsc),
+            Linux::Key1 => Ok(Self::Key1),
+            Linux::Key2 => Ok(Self::Key2),
+            Linux::Key3 => Ok(Self::Key3),
+            Linux::Key4 => Ok(Self::Key4),
+            Linux::Key5 => Ok(Self::Key5),
+            Linux::Key6 => Ok(Self::Key6),
+            Linux::Key7 => Ok(Self::Key7),
+            Linux::Key8 => Ok(Self::Key8),
+            Linux::Key9 => Ok(Self::Key9),
+            Linux::Key0 => Ok(Self::Key0),
+            Linux::KeyMinus => Ok(Self::KeyMinus),
+            Linux::KeyEqual => Ok(Self::KeyEqual),
+            Linux::KeyBackspace => Ok(Self::KeyDelete),
+            Linux::KeyTab => Ok(Self::KeyTab),
+            Linux::KeyQ => Ok(Self::KeyQ),
+            Linux::KeyW => Ok(Self::KeyW),
+            Linux::KeyE => Ok(Self::KeyE),
+            Linux::KeyR => Ok(Self::KeyR),
+            Linux::KeyT => Ok(Self::KeyT),
+            Linux::KeyY => Ok(Self::KeyY),
+            Linux::KeyU => Ok(Self::KeyU),
+            Linux::KeyI => Ok(Self::KeyI),
+            Linux::KeyO => Ok(Self::KeyO),
+            Linux::KeyP => Ok(Self::KeyP),
+            Linux::KeyLeftbrace => Ok(Self::KeyLeftBrace),
+            Linux::KeyRightbrace => Ok(Self::KeyRightBrace),
+            Linux::KeyEnter => Ok(Self::KeyEnter),
+            Linux::KeyLeftCtrl => Ok(Self::KeyLeftCtrl),
+            Linux::KeyA => Ok(Self::KeyA),
+            Linux::KeyS => Ok(Self::KeyS),
+            Linux::KeyD => Ok(Self::KeyD),
+            Linux::KeyF => Ok(Self::KeyF),
+            Linux::KeyG => Ok(Self::KeyG),
+            Linux::KeyH => Ok(Self::KeyH),
+            Linux::KeyJ => Ok(Self::KeyJ),
+            Linux::KeyK => Ok(Self::KeyK),
+            Linux::KeyL => Ok(Self::KeyL),
+            Linux::KeySemicolon => Ok(Self::KeySemiColon),
+            Linux::KeyApostrophe => Ok(Self::KeyApostrophe),
+            Linux::KeyGrave => Ok(Self::KeyGrave),
+            Linux::KeyLeftShift => Ok(Self::KeyLeftShift),
+            Linux::KeyBackslash => Ok(Self::KeyBackslash),
+            Linux::KeyZ => Ok(Self::KeyZ),
+            Linux::KeyX => Ok(Self::KeyX),
+            Linux::KeyC => Ok(Self::KeyC),
+            Linux::KeyV => Ok(Self::KeyV),
+            Linux::KeyB => Ok(Self::KeyB),
+            Linux::KeyN => Ok(Self::KeyN),
+            Linux::KeyM => Ok(Self::KeyM),
+            Linux::KeyComma => Ok(Self::KeyComma),
+            Linux::KeyDot => Ok(Self::KeyDot),
+            Linux::KeySlash => Ok(Self::KeySlash),
+            Linux::KeyRightShift => Ok(Self::KeyRightShift),
+            Linux::KeyKpAsterisk => Ok(Self::KeypadStar),
+            Linux::KeyLeftAlt => Ok(Self::KeyLeftAlt),
+            Linux::KeySpace => Ok(Self::KeySpace),
+            Linux::KeyCapsLock => Ok(Self::KeyCapsLock),
+            Linux::KeyF1 => Ok(Self::KeyF1),
+            Linux::KeyF2 => Ok(Self::KeyF2),
+            Linux::KeyF3 => Ok(Self::KeyF3),
+            Linux::KeyF4 => Ok(Self::KeyF4),
+            Linux::KeyF5 => Ok(Self::KeyF5),
+            Linux::KeyF6 => Ok(Self::KeyF6),
+            Linux::KeyF7 => Ok(Self::KeyF7),
+            Linux::KeyF8 => Ok(Self::KeyF8),
+            Linux::KeyF9 => Ok(Self::KeyF9),
+            Linux::KeyF10 => Ok(Self::KeyF10),
+            Linux::KeyNumlock => Ok(Self::KeypadNumLock),
+            Linux::KeyScrollLock => Ok(Self::KeyScrollLock),
+            Linux::KeyKp7 => Ok(Self::Keypad7Home),
+            Linux::KeyKp8 => Ok(Self::Keypad8UpArrow),
+            Linux::KeyKp9 => Ok(Self::Keypad9PageUp),
+            Linux::KeyKpMinus => Ok(Self::KeypadDash),
+            Linux::KeyKp4 => Ok(Self::Keypad4LeftArrow),
+            Linux::KeyKp5 => Ok(Self::Keypad5),
+            Linux::KeyKp6 => Ok(Self::Keypad6RightArrow),
+            Linux::KeyKpplus => Ok(Self::KeypadPlus),
+            Linux::KeyKp1 => Ok(Self::Keypad1End),
+            Linux::KeyKp2 => Ok(Self::Keypad2DownArrow),
+            Linux::KeyKp3 => Ok(Self::Keypad3PageDn),
+            Linux::KeyKp0 => Ok(Self::Keypad0Insert),
+            Linux::KeyKpDot => Ok(Self::KeypadDot),
+            Linux::KeyZenkakuhankaku => Ok(Self::KeyF24), // KeyLANG5
+            Linux::Key102nd => Ok(Self::KeyNonUSSlashBar), // TODO unsure
+            Linux::KeyF11 => Ok(Self::KeyF11),
+            Linux::KeyF12 => Ok(Self::KeyF12),
+            Linux::KeyRo => Ok(Self::KeyInternational1),
+            Linux::KeyKatakana => Ok(Self::KeyLANG3),
+            Linux::KeyHiragana => Ok(Self::KeyLANG4),
+            Linux::KeyHenkan => Ok(Self::KeyInternational4),
+            Linux::KeyKatakanahiragana => Ok(Self::KeyInternational2),
+            Linux::KeyMuhenkan => Ok(Self::KeyInternational5),
+            Linux::KeyKpJpComma => Ok(Self::KeypadComma),
+            Linux::KeyKpEnter => Ok(Self::KeypadEnter),
+            Linux::KeyRightCtrl => Ok(Self::KeyRightCtrl),
+            Linux::KeyKpslash => Ok(Self::KeypadSlash),
+            Linux::KeySysrq => Ok(Self::KeyPrintScreen), // TODO Windows does not have Sysrq, right?
+            Linux::KeyRightalt => Ok(Self::KeyRightAlt),
+            Linux::KeyLinefeed => Ok(Self::KeyEnter), // TODO unsure
+            Linux::KeyHome => Ok(Self::KeyHome),
+            Linux::KeyUp => Ok(Self::KeyUp),
+            Linux::KeyPageup => Ok(Self::KeyPageUp),
+            Linux::KeyLeft => Ok(Self::KeyLeft),
+            Linux::KeyRight => Ok(Self::KeyRight),
+            Linux::KeyEnd => Ok(Self::KeyEnd),
+            Linux::KeyDown => Ok(Self::KeyDown),
+            Linux::KeyPagedown => Ok(Self::KeyPageDown),
+            Linux::KeyInsert => Ok(Self::KeyInsert),
+            Linux::KeyDelete => Ok(Self::KeyDeleteForward),
+            Linux::KeyMacro => Err(()), // TODO
+            Linux::KeyMute => Ok(Self::KeyMute),
+            Linux::KeyVolumeDown => Ok(Self::KeyVolumeDown),
+            Linux::KeyVolumeUp => Ok(Self::KeyVolumeUp),
+            Linux::KeyPower => Ok(Self::Shutdown),
+            Linux::KeyKpequal => Ok(Self::KeypadEquals),
+            Linux::KeyKpplusminus => Ok(Self::KeypadPlus),
+            Linux::KeyPause => Ok(Self::KeyPause),
+            Linux::KeyScale => Err(()), // TODO
+            Linux::KeyKpcomma => Ok(Self::KeypadComma),
+            Linux::KeyHanguel => Ok(Self::KeyLANG1), // FIXME should be 00F2?
+            Linux::KeyHanja => Ok(Self::KeyLANG2),   // FIXME should be 00F1?
+            Linux::KeyYen => Ok(Self::KeyInternational3),
+            Linux::KeyLeftMeta => Ok(Self::KeyLeftGUI),
+            Linux::KeyRightmeta => Ok(Self::KeyRightGUI),
+            Linux::KeyCompose => Ok(Self::KeyApplication),
+            Linux::KeyStop => Ok(Self::ACStop),
+            Linux::KeyAgain => Err(()),
+            Linux::KeyProps => Err(()),
+            Linux::KeyUndo => Err(()),
+            Linux::KeyFront => Err(()),
+            Linux::KeyCopy => Err(()),
+            Linux::KeyOpen => Err(()),
+            Linux::KeyPaste => Err(()),
+            Linux::KeyFind => Ok(Self::ACSearch),
+            Linux::KeyCut => Err(()),
+            Linux::KeyHelp => Ok(Self::KeyF1), // AL Integrated Help Center?
+            Linux::KeyMenu => Ok(Self::KeyApplication),
+            Linux::KeyCalc => Ok(Self::ALCalculator),
+            Linux::KeySetup => Err(()),
+            Linux::KeySleep => Ok(Self::SystemSleep),
+            Linux::KeyWakeup => Ok(Self::SystemWakeUp),
+            Linux::KeyFile => Ok(Self::ALLocalMachineBrowser),
+            Linux::KeySendfile => Err(()),
+            Linux::KeyDeletefile => Err(()),
+            Linux::KeyXfer => Err(()),
+            Linux::KeyProg1 => Err(()),
+            Linux::KeyProg2 => Err(()),
+            Linux::KeyWww => Ok(Self::ACSearch), // TODO unsure
+            Linux::KeyMsdos => Err(()),
+            Linux::KeyCoffee => Err(()),
+            Linux::KeyRotateDisplay => Err(()),
+            Linux::KeyCyclewindows => Err(()),
+            Linux::KeyMail => Ok(Self::ALEmailReader),
+            Linux::KeyBookmarks => Ok(Self::ACBookmarks),
+            Linux::KeyComputer => Ok(Self::ACHome),
+            Linux::KeyBack => Ok(Self::ACBack),
+            Linux::KeyForward => Ok(Self::ACForward),
+            Linux::KeyClosecd => Err(()),
+            Linux::KeyEjectcd => Err(()),
+            Linux::KeyEjectclosecd => Err(()),
+            Linux::KeyNextsong => Ok(Self::KeyScanNextTrack),
+            Linux::KeyPlaypause => Ok(Self::KeyPlayPause),
+            Linux::KeyPrevioussong => Ok(Self::KeyScanPreviousTrack),
+            Linux::KeyStopcd => Ok(Self::KeyStop),
+            Linux::KeyRecord => Err(()),
+            Linux::KeyRewind => Err(()),
+            Linux::KeyPhone => Err(()),
+            Linux::KeyIso => Err(()),
+            Linux::KeyConfig => Err(()),
+            Linux::KeyHomepage => Ok(Self::ACHome),
+            Linux::KeyRefresh => Ok(Self::ACRefresh),
+            Linux::KeyExit => Err(()),
+            Linux::KeyMove => Err(()),
+            Linux::KeyEdit => Err(()),
+            Linux::KeyScrollup => Err(()),
+            Linux::KeyScrolldown => Err(()),
+            Linux::KeyKpleftparen => Err(()),
+            Linux::KeyKprightparen => Err(()),
+            Linux::KeyNew => Err(()),
+            Linux::KeyRedo => Err(()),
+            Linux::KeyF13 => Ok(Self::KeyF13),
+            Linux::KeyF14 => Ok(Self::KeyF14),
+            Linux::KeyF15 => Ok(Self::KeyF15),
+            Linux::KeyF16 => Ok(Self::KeyF16),
+            Linux::KeyF17 => Ok(Self::KeyF17),
+            Linux::KeyF18 => Ok(Self::KeyF18),
+            Linux::KeyF19 => Ok(Self::KeyF19),
+            Linux::KeyF20 => Ok(Self::KeyF20),
+            Linux::KeyF21 => Ok(Self::KeyF21),
+            Linux::KeyF22 => Ok(Self::KeyF22),
+            Linux::KeyF23 => Ok(Self::KeyF23),
+            Linux::KeyF24 => Ok(Self::KeyF24),
+            Linux::KeyPlaycd => Err(()),
+            Linux::KeyPausecd => Err(()),
+            Linux::KeyProg3 => Err(()),
+            Linux::KeyProg4 => Err(()),
+            Linux::KeyAllApplications => Err(()),
+            Linux::KeySuspend => Err(()),
+            Linux::KeyClose => Err(()),
+            Linux::KeyPlay => Err(()),
+            Linux::KeyFastforward => Err(()),
+            Linux::KeyBassboost => Err(()),
+            Linux::KeyPrint => Err(()),
+            Linux::KeyHp => Err(()),
+            Linux::KeyCamera => Err(()),
+            Linux::KeySound => Err(()),
+            Linux::KeyQuestion => Err(()),
+            Linux::KeyEmail => Err(()),
+            Linux::KeyChat => Err(()),
+            Linux::KeySearch => Err(()),
+            Linux::KeyConnect => Err(()),
+            Linux::KeyFinance => Err(()),
+            Linux::KeySport => Err(()),
+            Linux::KeyShop => Err(()),
+            Linux::KeyAlterase => Err(()),
+            Linux::KeyCancel => Err(()),
+            Linux::KeyBrightnessdown => Err(()),
+            Linux::KeyBrightnessup => Err(()),
+            Linux::KeyMedia => Err(()),
+            Linux::KeySwitchvideomode => Err(()),
+            Linux::KeyKbdillumtoggle => Err(()),
+            Linux::KeyKbdillumdown => Err(()),
+            Linux::KeyKbdillumup => Err(()),
+            Linux::KeySend => Err(()),
+            Linux::KeyReply => Err(()),
+            Linux::KeyForwardmail => Err(()),
+            Linux::KeySave => Err(()),
+            Linux::KeyDocuments => Err(()),
+            Linux::KeyBattery => Err(()),
+            Linux::KeyBluetooth => Err(()),
+            Linux::KeyWlan => Err(()),
+            Linux::KeyUwb => Err(()),
+            Linux::KeyUnknown => Err(()),
+            Linux::KeyVideoNext => Err(()),
+            Linux::KeyVideoPrev => Err(()),
+            Linux::KeyBrightnessCycle => Err(()),
+            Linux::KeyBrightnessAuto => Err(()),
+            Linux::KeyDisplayOff => Err(()),
+            Linux::KeyWwan => Err(()),
+            Linux::KeyRfkill => Err(()),
+            Linux::KeyMicmute => Err(()),
+            Linux::KeyCount => Err(()),
+            Linux::Invalid => Err(()),
+            Linux::Invalid1 => Err(()),
+            Linux::Invalid2 => Err(()),
+            Linux::Invalid3 => Err(()),
+            Linux::Invalid4 => Err(()),
+            Linux::Invalid5 => Err(()),
+        }
+    }
+}
+impl TryFrom<Windows> for Linux {
+    type Error = ();
+
+    fn try_from(value: Windows) -> Result<Self, Self::Error> {
+        match value {
+            Windows::Shutdown => Ok(Self::KeyPower),
+            Windows::SystemSleep => Ok(Self::KeySleep),
+            Windows::SystemWakeUp => Ok(Self::KeyWakeup),
+            Windows::ErrorRollOver => Ok(Self::KeyRo),
+            Windows::KeyA => Ok(Self::KeyA),
+            Windows::KeyB => Ok(Self::KeyB),
+            Windows::KeyC => Ok(Self::KeyC),
+            Windows::KeyD => Ok(Self::KeyD),
+            Windows::KeyE => Ok(Self::KeyE),
+            Windows::KeyF => Ok(Self::KeyF),
+            Windows::KeyG => Ok(Self::KeyG),
+            Windows::KeyH => Ok(Self::KeyH),
+            Windows::KeyI => Ok(Self::KeyI),
+            Windows::KeyJ => Ok(Self::KeyJ),
+            Windows::KeyK => Ok(Self::KeyK),
+            Windows::KeyL => Ok(Self::KeyL),
+            Windows::KeyM => Ok(Self::KeyM),
+            Windows::KeyN => Ok(Self::KeyN),
+            Windows::KeyO => Ok(Self::KeyO),
+            Windows::KeyP => Ok(Self::KeyP),
+            Windows::KeyQ => Ok(Self::KeyQ),
+            Windows::KeyR => Ok(Self::KeyR),
+            Windows::KeyS => Ok(Self::KeyS),
+            Windows::KeyT => Ok(Self::KeyT),
+            Windows::KeyU => Ok(Self::KeyU),
+            Windows::KeyV => Ok(Self::KeyV),
+            Windows::KeyW => Ok(Self::KeyW),
+            Windows::KeyX => Ok(Self::KeyX),
+            Windows::KeyY => Ok(Self::KeyY),
+            Windows::KeyZ => Ok(Self::KeyZ),
+            Windows::Key1 => Ok(Self::Key1),
+            Windows::Key2 => Ok(Self::Key2),
+            Windows::Key3 => Ok(Self::Key3),
+            Windows::Key4 => Ok(Self::Key4),
+            Windows::Key5 => Ok(Self::Key5),
+            Windows::Key6 => Ok(Self::Key6),
+            Windows::Key7 => Ok(Self::Key7),
+            Windows::Key8 => Ok(Self::Key8),
+            Windows::Key9 => Ok(Self::Key9),
+            Windows::Key0 => Ok(Self::Key0),
+            Windows::KeyEnter => Ok(Self::KeyEnter),
+            Windows::KeyEsc => Ok(Self::KeyEsc),
+            Windows::KeyDelete => Ok(Self::KeyBackspace),
+            Windows::KeyTab => Ok(Self::KeyTab),
+            Windows::KeySpace => Ok(Self::KeySpace),
+            Windows::KeyMinus => Ok(Self::KeyMinus),
+            Windows::KeyEqual => Ok(Self::KeyEqual),
+            Windows::KeyLeftBrace => Ok(Self::KeyLeftbrace),
+            Windows::KeyRightBrace => Ok(Self::KeyRightbrace),
+            Windows::KeyBackslash => Ok(Self::KeyBackslash),
+            Windows::KeySemiColon => Ok(Self::KeySemicolon),
+            Windows::KeyApostrophe => Ok(Self::KeyApostrophe),
+            Windows::KeyGrave => Ok(Self::KeyGrave),
+            Windows::KeyComma => Ok(Self::KeyComma),
+            Windows::KeyDot => Ok(Self::KeyDot),
+            Windows::KeySlash => Ok(Self::KeySlash),
+            Windows::KeyCapsLock => Ok(Self::KeyCapsLock),
+            Windows::KeyF1 => Ok(Self::KeyF1),
+            Windows::KeyF2 => Ok(Self::KeyF2),
+            Windows::KeyF3 => Ok(Self::KeyF3),
+            Windows::KeyF4 => Ok(Self::KeyF4),
+            Windows::KeyF5 => Ok(Self::KeyF5),
+            Windows::KeyF6 => Ok(Self::KeyF6),
+            Windows::KeyF7 => Ok(Self::KeyF7),
+            Windows::KeyF8 => Ok(Self::KeyF8),
+            Windows::KeyF9 => Ok(Self::KeyF9),
+            Windows::KeyF10 => Ok(Self::KeyF10),
+            Windows::KeyF11 => Ok(Self::KeyF11),
+            Windows::KeyF12 => Ok(Self::KeyF12),
+            Windows::KeyPrintScreen => Ok(Self::KeySysrq),
+            Windows::KeyScrollLock => Ok(Self::KeyScrollLock),
+            Windows::KeyPause => Ok(Self::KeyPause),
+            Windows::KeyInsert => Ok(Self::KeyInsert),
+            Windows::KeyHome => Ok(Self::KeyHome),
+            Windows::KeyPageUp => Ok(Self::KeyPageup),
+            Windows::KeyDeleteForward => Ok(Self::KeyDelete),
+            Windows::KeyEnd => Ok(Self::KeyEnd),
+            Windows::KeyPageDown => Ok(Self::KeyPagedown),
+            Windows::KeyRight => Ok(Self::KeyRight),
+            Windows::KeyLeft => Ok(Self::KeyLeft),
+            Windows::KeyDown => Ok(Self::KeyDown),
+            Windows::KeyUp => Ok(Self::KeyUp),
+            Windows::KeypadNumLock => Ok(Self::KeyNumlock),
+            Windows::KeypadSlash => Ok(Self::KeyKpslash),
+            Windows::KeypadStar => Ok(Self::KeyKpAsterisk),
+            Windows::KeypadDash => Ok(Self::KeyKpMinus),
+            Windows::KeypadPlus => Ok(Self::KeyKpplus),
+            Windows::KeypadEnter => Ok(Self::KeyKpEnter),
+            Windows::Keypad1End => Ok(Self::KeyKp1),
+            Windows::Keypad2DownArrow => Ok(Self::KeyKp2),
+            Windows::Keypad3PageDn => Ok(Self::KeyKp3),
+            Windows::Keypad4LeftArrow => Ok(Self::KeyKp4),
+            Windows::Keypad5 => Ok(Self::KeyKp5),
+            Windows::Keypad6RightArrow => Ok(Self::KeyKp6),
+            Windows::Keypad7Home => Ok(Self::KeyKp7),
+            Windows::Keypad8UpArrow => Ok(Self::KeyKp8),
+            Windows::Keypad9PageUp => Ok(Self::KeyKp9),
+            Windows::Keypad0Insert => Ok(Self::KeyKp0),
+            Windows::KeypadDot => Ok(Self::KeyKpDot),
+            Windows::KeyNonUSSlashBar => Ok(Self::Key102nd),
+            Windows::KeyApplication => Ok(Self::KeyMenu),
+            Windows::KeypadEquals => Ok(Self::KeyKpequal),
+            Windows::KeyF13 => Ok(Self::KeyF13),
+            Windows::KeyF14 => Ok(Self::KeyF14),
+            Windows::KeyF15 => Ok(Self::KeyF15),
+            Windows::KeyF16 => Ok(Self::KeyF16),
+            Windows::KeyF17 => Ok(Self::KeyF17),
+            Windows::KeyF18 => Ok(Self::KeyF18),
+            Windows::KeyF19 => Ok(Self::KeyF19),
+            Windows::KeyF20 => Ok(Self::KeyF20),
+            Windows::KeyF21 => Ok(Self::KeyF21),
+            Windows::KeyF22 => Ok(Self::KeyF22),
+            Windows::KeyF23 => Ok(Self::KeyF23),
+            Windows::KeyF24 => Ok(Self::KeyF24),
+            Windows::KeypadComma => Ok(Self::KeyKpcomma),
+            Windows::KeyInternational1 => Ok(Self::KeyRo),
+            Windows::KeyInternational2 => Ok(Self::KeyKatakanahiragana),
+            Windows::KeyInternational3 => Ok(Self::KeyYen),
+            Windows::KeyInternational4 => Ok(Self::KeyHenkan),
+            Windows::KeyInternational5 => Ok(Self::KeyMuhenkan),
+            Windows::KeyLANG1 => Ok(Self::KeyHanguel),
+            Windows::KeyLANG2 => Ok(Self::KeyHanja),
+            Windows::KeyLANG3 => Ok(Self::KeyKatakana),
+            Windows::KeyLANG4 => Ok(Self::KeyHiragana),
+            Windows::KeyLeftCtrl => Ok(Self::KeyLeftCtrl),
+            Windows::KeyLeftShift => Ok(Self::KeyLeftShift),
+            Windows::KeyLeftAlt => Ok(Self::KeyLeftAlt),
+            Windows::KeyLeftGUI => Ok(Self::KeyLeftMeta),
+            Windows::KeyRightCtrl => Ok(Self::KeyRightCtrl),
+            Windows::KeyRightShift => Ok(Self::KeyRightShift),
+            Windows::KeyFakeRightShift => Ok(Self::KeyRightShift),
+            Windows::KeyRightAlt => Ok(Self::KeyRightalt),
+            Windows::KeyRightGUI => Ok(Self::KeyRightmeta),
+            Windows::KeyScanNextTrack => Ok(Self::KeyNextsong),
+            Windows::KeyScanPreviousTrack => Ok(Self::KeyPrevioussong),
+            Windows::KeyStop => Ok(Self::KeyStopcd),
+            Windows::KeyPlayPause => Ok(Self::KeyPlaypause),
+            Windows::KeyMute => Ok(Self::KeyMute),
+            Windows::KeyVolumeUp => Ok(Self::KeyVolumeUp),
+            Windows::KeyVolumeDown => Ok(Self::KeyVolumeDown),
+            Windows::ALConsumerControlConfiguration => Err(()),
+            Windows::ALEmailReader => Ok(Self::KeyMail),
+            Windows::ALCalculator => Ok(Self::KeyCalc),
+            Windows::ALLocalMachineBrowser => Ok(Self::KeyFile),
+            Windows::ACSearch => Ok(Self::KeyWww),
+            Windows::ACHome => Ok(Self::KeyHomepage),
+            Windows::ACBack => Ok(Self::KeyBack),
+            Windows::ACForward => Ok(Self::KeyForward),
+            Windows::ACStop => Ok(Self::KeyStop),
+            Windows::ACRefresh => Ok(Self::KeyRefresh),
+            Windows::ACBookmarks => Ok(Self::KeyBookmarks),
+        }
+    }
+}

nix/README.md

@@ -0,0 +1,43 @@
+# Nix Flake Usage
+
+## run
+
+```bash
+nix run github:feschber/lan-mouse
+
+# with params
+nix run github:feschber/lan-mouse -- --help
+
+```
+
+## home-manager module
+
+add input
+
+```nix
+inputs = {
+    lan-mouse.url = "github:feschber/lan-mouse";
+}
+```
+
+enable lan-mouse
+
+``` nix
+{
+  inputs,
+  ...
+}: {
+  # add the home manager module
+  imports = [inputs.lan-mouse.homeManagerModules.default];
+
+  programs.lan-mouse = {
+    enable = true;
+    # systemd = false;
+    # package = inputs.lan-mouse.packages.${pkgs.stdenv.hostPlatform.system}.default
+    # Optional configuration in nix syntax, see config.toml for available options
+    # settings = { };
+    };
+  };
+}
+
+```

nix/default.nix

@@ -0,0 +1,55 @@
+{
+  rustPlatform,
+  lib,
+  pkgs,
+}: let
+  cargoToml = builtins.fromTOML (builtins.readFile ../Cargo.toml);
+  pname = cargoToml.package.name;
+  version = cargoToml.package.version;
+in
+rustPlatform.buildRustPackage {
+  pname = pname;
+  version = version;
+
+  nativeBuildInputs = with pkgs; [
+    pkg-config
+    cmake
+    makeWrapper
+    buildPackages.gtk4
+  ];
+
+  buildInputs = with pkgs; [
+    xorg.libX11
+    gtk4
+    libadwaita
+    xorg.libXtst
+  ] ++ lib.optionals stdenv.isDarwin [
+    darwin.apple_sdk_11_0.frameworks.CoreGraphics
+  ];
+
+  src = builtins.path {
+    name = pname;
+    path = lib.cleanSource ../.;
+  };
+
+  cargoLock.lockFile = ../Cargo.lock;
+
+  # Set Environment Variables
+  RUST_BACKTRACE = "full";
+
+  # Needed to enable support for SVG icons in GTK
+  postInstall = ''
+    wrapProgram "$out/bin/lan-mouse" \
+      --set GDK_PIXBUF_MODULE_FILE ${pkgs.librsvg.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
+  '';
+
+  meta = with lib; {
+    description = "Lan Mouse is a mouse and keyboard sharing software";
+    longDescription = ''
+      Lan Mouse is a mouse and keyboard sharing software similar to universal-control on Apple devices. It allows for using multiple pcs with a single set of mouse and keyboard. This is also known as a Software KVM switch.
+      The primary target is Wayland on Linux but Windows and MacOS and Linux on Xorg have partial support as well (see below for more details).
+    '';
+    mainProgram = pname;
+    platforms = platforms.all;
+  };
+}

nix/hm-module.nix

@@ -0,0 +1,82 @@
+self: {
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.programs.lan-mouse;
+  defaultPackage = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
+  tomlFormat = pkgs.formats.toml {};
+in {
+  options.programs.lan-mouse = with types; {
+    enable = mkEnableOption "Whether or not to enable lan-mouse.";
+    package = mkOption {
+      type = with types; nullOr package;
+      default = defaultPackage;
+      defaultText = literalExpression "inputs.lan-mouse.packages.${pkgs.stdenv.hostPlatform.system}.default";
+      description = ''
+        The lan-mouse package to use.
+
+        By default, this option will use the `packages.default` as exposed by this flake.
+      '';
+    };
+    systemd = mkOption {
+      type = types.bool;
+      default = pkgs.stdenv.isLinux;
+      description = "Whether to enable to systemd service for lan-mouse on linux.";
+    };
+    launchd = mkOption {
+      type = types.bool;
+      default = pkgs.stdenv.isDarwin;
+      description = "Whether to enable to launchd service for lan-mouse on macOS.";
+    };
+    settings = lib.mkOption {
+      inherit (tomlFormat) type;
+      default = {};
+      example = builtins.fromTOML (builtins.readFile (self + /config.toml));
+      description = ''
+        Optional configuration written to {file}`$XDG_CONFIG_HOME/lan-mouse/config.toml`.
+
+        See <https://github.com/feschber/lan-mouse/> for
+        available options and documentation.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.lan-mouse = lib.mkIf cfg.systemd {
+      Unit = {
+        Description = "Systemd service for Lan Mouse";
+        Requires = ["graphical-session.target"];
+      };
+      Service = {
+        Type = "simple";
+        ExecStart = "${cfg.package}/bin/lan-mouse --daemon";
+      };
+      Install.WantedBy = [
+        (lib.mkIf config.wayland.windowManager.hyprland.systemd.enable "hyprland-session.target")
+        (lib.mkIf config.wayland.windowManager.sway.systemd.enable "sway-session.target")
+      ];
+    };
+
+    launchd.agents.lan-mouse = lib.mkIf cfg.launchd {
+      enable = true;
+      config = {
+        ProgramArguments = [
+          "${cfg.package}/bin/lan-mouse"
+          "--daemon"
+        ];
+        KeepAlive = true;
+      };
+    };
+
+    home.packages = [
+      cfg.package
+    ];
+
+    xdg.configFile."lan-mouse/config.toml" = lib.mkIf (cfg.settings != {}) {
+      source = tomlFormat.generate "config.toml" cfg.settings;
+    };
+  };
+}

resources/client_row.ui

@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+	<template class="ClientRow" parent="AdwExpanderRow">
+		<property name="title">hostname</property>
+		<!-- enabled -->
+		<child type="prefix">
+			<object class="GtkSwitch" id="enable_switch">
+				<signal name="state_set" handler="handle_client_set_state" swapped="true"/>
+				<property name="valign">center</property>
+				<property name="halign">end</property>
+				<property name="tooltip-text" translatable="yes">enable</property>
+			</object>
+		</child>
+		<child type="suffix">
+			<object class="GtkButton" id="dns_button">
+				<signal name="clicked" handler="handle_request_dns" swapped="true"/>
+				<!--<property name="icon-name">network-wired-disconnected-symbolic</property>-->
+				<property name="icon-name">network-wired-symbolic</property>
+				<property name="valign">center</property>
+				<property name="halign">end</property>
+				<property name="tooltip-text" translatable="yes">resolve host</property>
+			</object>
+		</child>
+		<child type="suffix">
+			<object class="GtkSpinner" id="dns_loading_indicator">
+			</object>
+		</child>
+		<!-- host -->
+		<child>
+			<object class="AdwActionRow">
+				<property name="title">hostname</property>
+				<property name="subtitle">port</property>
+				<!-- hostname -->
+				<child>
+					<object class="GtkEntry" id="hostname">
+						<!-- <property name="title" translatable="yes">hostname</property> -->
+						<property name="xalign">0.5</property>
+						<property name="valign">center</property>
+						<property name="placeholder-text">hostname</property>
+						<property name="width-chars">-1</property>
+					</object>
+				</child>
+				<!-- port -->
+				<child>
+					<object class="GtkEntry" id="port">
+						<!-- <property name="title" translatable="yes">port</property> -->
+                        <property name="max-width-chars">5</property>
+						<property name="input_purpose">GTK_INPUT_PURPOSE_NUMBER</property>
+						<property name="xalign">0.5</property>
+						<property name="valign">center</property>
+						<property name="placeholder-text">4242</property>
+						<property name="width-chars">5</property>
+					</object>
+				</child>
+			</object>
+		</child>
+		<!-- position -->
+		<child>
+			<object class="AdwComboRow" id="position">
+				<property name="title" translatable="yes">position</property>
+				<property name="model">
+					<object class="GtkStringList">
+						<items>
+							<item>Left</item>
+							<item>Right</item>
+							<item>Top</item>
+							<item>Bottom</item>
+						</items>
+					</object>
+				</property>
+			</object>
+		</child>
+		<!-- delete button -->
+		<child>
+			<object class="AdwActionRow" id="delete_row">
+				<property name="title">delete this client</property>
+				<child>
+					<object class="GtkButton" id="delete_button">
+						<signal name="activate" handler="handle_client_delete" object="delete_row" swapped="true"/>
+						<property name="icon-name">user-trash-symbolic</property>
+						<property name="valign">center</property>
+						<property name="halign">center</property>
+						<property name="name">delete-button</property>
+						<style><class name="error"/></style>
+					</object>
+				</child>
+			</object>
+		</child>
+	</template>
+</interface>

resources/de.feschber.LanMouse.svg

@@ -0,0 +1,171 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="48"
+   height="48"
+   viewBox="0 0 12.7 12.7"
+   version="1.1"
+   id="svg1"
+   inkscape:version="1.3 (0e150ed6c4, 2023-07-21)"
+   sodipodi:docname="mouse-icon.svg"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="mm"
+     inkscape:zoom="22.737887"
+     inkscape:cx="19.54887"
+     inkscape:cy="26.167778"
+     inkscape:window-width="2560"
+     inkscape:window-height="1374"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1" />
+  <defs
+     id="defs1" />
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
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+             cy="8.17869"
+             rx="0.49368349"
+             ry="0.62533247" />
+          <ellipse
+             style="fill:#3d3d3d;fill-opacity:1;stroke:none;stroke-width:0.168876;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:none;paint-order:normal"
+             id="ellipse16"
+             cx="4.6085634"
+             cy="8.17869"
+             rx="0.31096464"
+             ry="0.40317491" />
+        </g>
+        <ellipse
+           style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.112226;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:none;paint-order:normal"
+           id="circle18"
+           cx="3.5003331"
+           cy="9.0344076"
+           rx="0.078639306"
+           ry="0.07816644" />
+        <ellipse
+           style="fill:#4f4f4f;fill-opacity:1;stroke:none;stroke-width:0.264999;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1;paint-order:normal"
+           id="path19"
+           cx="2.4818404"
+           cy="9.4499254"
+           rx="0.05348238"
+           ry="0.11930636" />
+      </g>
+    </g>
+  </g>
+</svg>

resources/resources.gresource.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gresources>
+  <gresource prefix="/de/feschber/LanMouse">
+    <file compressed="true" preprocess="xml-stripblanks">window.ui</file>
+    <file compressed="true" preprocess="xml-stripblanks">client_row.ui</file>
+  </gresource>
+  <gresource prefix="/de/feschber/LanMouse/icons">
+    <file compressed="true" preprocess="xml-stripblanks">de.feschber.LanMouse.svg</file>
+  </gresource>
+</gresources>

resources/window.ui

@@ -0,0 +1,227 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk" version="4.0"/>
+  <requires lib="libadwaita" version="1.0"/>
+  <menu id="main-menu">
+    <item>
+      <attribute name="label" translatable="yes">_Close window</attribute>
+      <attribute name="action">window.close</attribute>
+    </item>
+  </menu>
+  <template class="LanMouseWindow" parent="AdwApplicationWindow">
+    <property name="width-request">600</property>
+    <property name="height-request">700</property>
+    <property name="title" translatable="yes">Lan Mouse</property>
+    <property name="show-menubar">True</property>
+    <property name="content">
+      <object class="GtkBox">
+        <property name="orientation">vertical</property>
+        <child type="top">
+          <object class="AdwHeaderBar">
+            <child type ="end">
+              <object class="GtkMenuButton">
+                <property name="icon-name">open-menu-symbolic</property>
+                <property name="menu-model">main-menu</property>
+              </object>
+            </child>
+            <style>
+              <class name="flat"/>
+            </style>
+          </object>
+        </child>
+        <child>
+          <object class="AdwToastOverlay" id="toast_overlay">
+            <child>
+              <object class="AdwStatusPage">
+                <property name="title" translatable="yes">Lan Mouse</property>
+                <property name="description" translatable="yes">easily use your mouse and keyboard on multiple computers</property>
+                <property name="icon-name">de.feschber.LanMouse</property>
+                <property name="child">
+                  <object class="AdwClamp">
+                  <property name="maximum-size">600</property>
+                  <property name="tightening-threshold">0</property>
+                  <property name="child">
+                    <object class="GtkBox">
+                    <property name="orientation">vertical</property>
+                    <property name="spacing">12</property>
+                    <child>
+                      <object class="AdwPreferencesGroup" id="capture_emulation_group">
+                      <property name="title" translatable="yes">Capture / Emulation Status</property>
+                        <child>
+                          <object class="AdwActionRow" id="capture_status_row">
+                            <property name="title">input capture is disabled</property>
+                            <property name="subtitle">required for outgoing and incoming connections</property>
+                            <property name="icon-name">dialog-warning-symbolic</property>
+                            <child>
+                              <object class="GtkButton" id="input_capture_button">
+                                <property name="child">
+                                  <object class="AdwButtonContent">
+                                    <property name="icon-name">object-rotate-right-symbolic</property>
+                                    <property name="label" translatable="yes">Reenable</property>
+                                  </object>
+                                </property>
+                                <signal name="clicked" handler="handle_capture" swapped="true"/>
+                                <property name="valign">center</property>
+                                <style>
+                                  <class name="circular"/>
+                                  <class name="flat"/>
+                                </style>
+                              </object>
+                            </child>
+                            <style>
+                              <class name="warning"/>
+                            </style>
+                          </object>
+                        </child>
+                        <child>
+                          <object class="AdwActionRow" id="emulation_status_row">
+                            <property name="title">input emulation is disabled</property>
+                            <property name="subtitle">required for incoming connections</property>
+                            <property name="icon-name">dialog-warning-symbolic</property>
+                            <child>
+                              <object class="GtkButton" id="input_emulation_button">
+                                <property name="child">
+                                  <object class="AdwButtonContent">
+                                    <property name="icon-name">object-rotate-right-symbolic</property>
+                                    <property name="label" translatable="yes">Reenable</property>
+                                  </object>
+                                </property>
+                                <property name="valign">center</property>
+                                <signal name="clicked" handler="handle_emulation" swapped="true"/>
+                                <style>
+                                  <class name="circular"/>
+                                  <class name="flat"/>
+                                </style>
+                              </object>
+                            </child>
+                            <child>
+                            </child>
+                            <style>
+                              <class name="warning"/>
+                            </style>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="AdwPreferencesGroup">
+                        <property name="title" translatable="yes">General</property>
+                        <!--
+                        <child>
+                          <object class="AdwActionRow">
+                            <property name="title" translatable="yes">enable</property>
+                            <child type="suffix">
+                              <object class="GtkSwitch">
+                                <property name="valign">center</property>
+                                <property name="tooltip-text" translatable="yes">enable</property>
+                              </object>
+                            </child>
+                          </object>
+                        </child>
+                        -->
+                        <child>
+                          <object class="AdwActionRow">
+                            <property name="title">port</property>
+                            <child>
+                              <object class="GtkEntry" id="port_entry">
+                                <property name="max-width-chars">5</property>
+                                <signal name="activate" handler="handle_port_edit_apply" swapped="true"/>
+                                <signal name="changed" handler="handle_port_changed" swapped="true"/>
+                                <!-- <signal name="delete-text" handler="handle_port_changed" swapped="true"/> -->
+                                <!-- <property name="title" translatable="yes">port</property> -->
+                                <property name="placeholder-text">4242</property>
+                                <property name="width-chars">5</property>
+                                <property name="xalign">0.5</property>
+                                <property name="valign">center</property>
+                                <!-- <property name="show-apply-button">True</property> -->
+                                <property name="input-purpose">GTK_INPUT_PURPOSE_DIGITS</property>
+                              </object>
+                            </child>
+                            <child>
+                              <object class="GtkButton" id="port_edit_apply">
+                                <signal name="clicked" handler="handle_port_edit_apply" swapped="true"/>
+                                <property name="icon-name">object-select-symbolic</property>
+                                <property name="valign">center</property>
+                                <property name="visible">false</property>
+                                <property name="name">port-edit-apply</property>
+                                <style><class name="success"/></style>
+                              </object>
+                            </child>
+                            <child>
+                              <object class="GtkButton" id="port_edit_cancel">
+                                <signal name="clicked" handler="handle_port_edit_cancel" swapped="true"/>
+                                <property name="icon-name">process-stop-symbolic</property>
+                                <property name="valign">center</property>
+                                <property name="visible">false</property>
+                                <property name="name">port-edit-cancel</property>
+                                <style><class name="error"/></style>
+                              </object>
+                            </child>
+                          </object>
+                        </child>
+                        <child>
+                          <object class="AdwActionRow">
+                            <property name="title">hostname</property>
+                            <child>
+                              <object class="GtkLabel" id="hostname_label">
+                                <property name="label">&lt;span font_style=&quot;italic&quot; font_weight=&quot;light&quot; foreground=&quot;darkgrey&quot;&gt;could not determine hostname&lt;/span&gt;</property>
+                                <property name="use-markup">true</property>
+                                <property name="valign">center</property>
+                              </object>
+                            </child>
+                            <child>
+                              <object class="GtkButton" id="copy-hostname-button">
+                                <property name="icon-name">edit-copy-symbolic</property>
+                                <property name="valign">center</property>
+                                <signal name="clicked" handler="handle_copy_hostname" swapped="true"/>
+                              </object>
+                            </child>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="AdwPreferencesGroup">
+                        <property name="title" translatable="yes">Connections</property>
+                        <property name="header-suffix">
+                          <object class="GtkButton">
+                            <signal name="clicked" handler="handle_add_client_pressed" swapped="true"/>
+                            <property name="child">
+                              <object class="AdwButtonContent">
+                                <property name="icon-name">list-add-symbolic</property>
+                                <property name="label" translatable="yes">Add</property>
+                              </object>
+                            </property>
+                          <style>
+                            <class name="flat"/>
+                          </style>
+                          </object>
+                        </property>
+                        <child>
+                          <object class="GtkListBox" id="client_list">
+                            <property name="selection-mode">none</property>
+                            <child type="placeholder">
+                              <object class="AdwActionRow" id="client_placeholder">
+                                <property name="title">No connections!</property>
+                                <property name="subtitle">add a new client via the + button</property>
+                              </object>
+                            </child>
+                            <style>
+                              <class name="boxed-list" />
+                            </style>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
+                    </object>
+                  </property>
+                  </object>
+                </property>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </property>
+  </template>
+</interface>

service/lan-mouse.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Lan Mouse
+# lan mouse needs an active graphical session
+After=graphical-session.target
+# make sure the service terminates with the graphical session
+BindsTo=graphical-session.target
+
+[Service]
+ExecStart=/usr/bin/lan-mouse --daemon
+Restart=on-failure
+
+[Install]
+WantedBy=graphical-session.target

shell.nix

@@ -0,0 +1 @@
+(builtins.getFlake ("git+file://" + toString ./.)).devShells.${builtins.currentSystem}.default

src/backend.rs

@@ -1,2 +0,0 @@
-pub mod consumer;
-pub mod producer;

src/backend/consumer.rs

@@ -1,14 +0,0 @@
-#[cfg(windows)]
-pub mod windows;
-
-#[cfg(all(unix, feature="x11"))]
-pub mod x11;
-
-#[cfg(all(unix, feature = "wayland"))]
-pub mod wlroots;
-
-#[cfg(all(unix, feature = "xdg_desktop_portal"))]
-pub mod xdg_desktop_portal;
-
-#[cfg(all(unix, feature = "libei"))]
-pub mod libei;

src/backend/consumer/libei.rs

@@ -1,18 +0,0 @@
-use crate::consumer::EventConsumer;
-
-pub struct LibeiConsumer {}
-
-impl LibeiConsumer {
-    pub fn new() -> Self { Self {  } }
-}
-
-impl EventConsumer for LibeiConsumer {
-    fn consume(&self, _: crate::event::Event, _: crate::client::ClientHandle) {
-        log::error!("libei backend not yet implemented!");
-        todo!()
-    }
-
-    fn notify(&mut self, _: crate::client::ClientEvent) {
-        todo!()
-    }
-}

src/backend/consumer/windows.rs

@@ -1,149 +0,0 @@
-use crate::{event::{KeyboardEvent, PointerEvent}, consumer::EventConsumer};
-use winapi::{
-    self,
-    um::winuser::{INPUT, INPUT_MOUSE, LPINPUT, MOUSEEVENTF_MOVE, MOUSEINPUT,
-        MOUSEEVENTF_LEFTDOWN,
-        MOUSEEVENTF_RIGHTDOWN,
-        MOUSEEVENTF_MIDDLEDOWN,
-        MOUSEEVENTF_LEFTUP,
-        MOUSEEVENTF_RIGHTUP,
-        MOUSEEVENTF_MIDDLEUP,
-        MOUSEEVENTF_WHEEL,
-        MOUSEEVENTF_HWHEEL, INPUT_KEYBOARD, KEYBDINPUT, KEYEVENTF_SCANCODE, KEYEVENTF_KEYUP,
-    },
-};
-
-use crate::{
-    client::{ClientEvent, ClientHandle},
-    event::Event,
-};
-
-
-pub struct WindowsConsumer {}
-
-impl WindowsConsumer {
-    pub fn new() -> Self { Self {  } }
-}
-
-impl EventConsumer for WindowsConsumer {
-    fn consume(&self, event: Event, _: ClientHandle) {
-        match event {
-            Event::Pointer(pointer_event) => match pointer_event {
-                PointerEvent::Motion {
-                    time: _,
-                    relative_x,
-                    relative_y,
-                } => {
-                    rel_mouse(relative_x as i32, relative_y as i32);
-                }
-                PointerEvent::Button { time:_, button, state } => { mouse_button(button, state)}
-                PointerEvent::Axis { time:_, axis, value } => { scroll(axis, value) }
-                PointerEvent::Frame {} => {}
-            },
-            Event::Keyboard(keyboard_event) => match keyboard_event {
-                KeyboardEvent::Key { time:_, key, state } => { key_event(key, state) }
-                KeyboardEvent::Modifiers { .. } => {}
-            },
-            _ => {}
-        }
-    }
-
-    fn notify(&mut self, _: ClientEvent) {
-        // nothing to do
-    }
-}
-
-fn send_mouse_input(mi: MOUSEINPUT) {
-    unsafe {
-        let mut input = INPUT {
-            type_: INPUT_MOUSE,
-            u: std::mem::transmute(mi),
-        };
-
-        winapi::um::winuser::SendInput(
-            1 as u32,
-            &mut input as LPINPUT,
-            std::mem::size_of::<INPUT>() as i32,
-        );
-    }
-}
-
-fn rel_mouse(dx: i32, dy: i32) {
-    let mi = MOUSEINPUT {
-        dx,
-        dy,
-        mouseData: 0,
-        dwFlags: MOUSEEVENTF_MOVE,
-        time: 0,
-        dwExtraInfo: 0,
-    };
-    send_mouse_input(mi);
-}
-
-fn mouse_button(button: u32, state: u32) {
-    let dw_flags = match state {
-        0 => match button {
-            0x110 => MOUSEEVENTF_LEFTUP,
-            0x111 => MOUSEEVENTF_RIGHTUP,
-            0x112 => MOUSEEVENTF_MIDDLEUP,
-            _ => return
-        }
-        1 => match button {
-            0x110 => MOUSEEVENTF_LEFTDOWN,
-            0x111 => MOUSEEVENTF_RIGHTDOWN,
-            0x112 => MOUSEEVENTF_MIDDLEDOWN,
-            _ => return
-        }
-        _ => return
-    };
-    let mi = MOUSEINPUT {
-        dx: 0, dy: 0, // no movement
-        mouseData: 0,
-        dwFlags: dw_flags,
-        time: 0,
-        dwExtraInfo: 0,
-    };
-    send_mouse_input(mi);
-}
-
-fn scroll(axis: u8, value: f64) {
-    let event_type = match axis {
-        0 => MOUSEEVENTF_WHEEL,
-        1 => MOUSEEVENTF_HWHEEL,
-        _ => return
-    };
-    let mi = MOUSEINPUT {
-        dx: 0, dy: 0,
-        mouseData: (-value * 15.0) as i32 as u32,
-        dwFlags: event_type,
-        time: 0,
-        dwExtraInfo: 0,
-    };
-    send_mouse_input(mi);
-}
-
-fn key_event(key: u32, state: u8) {
-    let ki = KEYBDINPUT {
-        wVk: 0,
-        wScan: key as u16,
-        dwFlags: KEYEVENTF_SCANCODE | match state {
-            0 => KEYEVENTF_KEYUP,
-            1 => 0u32,
-            _ => return
-        },
-        time: 0,
-        dwExtraInfo: 0,
-    };
-    send_keyboard_input(ki);
-}
-
-fn send_keyboard_input(ki: KEYBDINPUT) {
-    unsafe {
-        let mut input = INPUT {
-            type_: INPUT_KEYBOARD,
-            u: std::mem::zeroed(),
-        };
-        *input.u.ki_mut() = ki;
-        winapi::um::winuser::SendInput(1 as u32, &mut input, std::mem::size_of::<INPUT>() as i32);
-    }
-}

src/backend/consumer/wlroots.rs

@@ -1,314 +0,0 @@
-use wayland_client::WEnum;
-use crate::client::{ClientHandle, ClientEvent};
-use crate::consumer::EventConsumer;
-use std::collections::HashMap;
-use std::os::fd::OwnedFd;
-use std::os::unix::prelude::AsRawFd;
-
-use anyhow::{Result, anyhow};
-use wayland_client::globals::BindError;
-use wayland_client::protocol::wl_pointer::{Axis, ButtonState};
-use wayland_client::protocol::wl_keyboard::{self, WlKeyboard};
-use wayland_client::protocol::wl_seat::WlSeat;
-use wayland_protocols_wlr::virtual_pointer::v1::client::{
-    zwlr_virtual_pointer_manager_v1::ZwlrVirtualPointerManagerV1 as VpManager,
-    zwlr_virtual_pointer_v1::ZwlrVirtualPointerV1 as Vp,
-};
-
-use wayland_protocols_misc::zwp_virtual_keyboard_v1::client::{
-    zwp_virtual_keyboard_manager_v1::ZwpVirtualKeyboardManagerV1 as VkManager,
-    zwp_virtual_keyboard_v1::ZwpVirtualKeyboardV1 as Vk,
-};
-
-use wayland_protocols_plasma::fake_input::client::org_kde_kwin_fake_input::OrgKdeKwinFakeInput;
-
-use wayland_client::{
-    delegate_noop,
-    globals::{registry_queue_init, GlobalListContents},
-    protocol::{wl_registry, wl_seat},
-    Connection, Dispatch, EventQueue, QueueHandle,
-};
-
-use crate::event::{Event, KeyboardEvent, PointerEvent};
-
-enum VirtualInputManager {
-    Wlroots { vpm: VpManager, vkm: VkManager },
-    Kde { fake_input: OrgKdeKwinFakeInput },
-}
-
-struct State {
-    keymap: Option<(u32, OwnedFd, u32)>,
-    input_for_client: HashMap<ClientHandle, VirtualInput>,
-    seat: wl_seat::WlSeat,
-    virtual_input_manager: VirtualInputManager,
-    qh: QueueHandle<Self>,
-}
-
-// App State, implements Dispatch event handlers
-pub(crate) struct WlrootsConsumer {
-    state: State,
-    queue: EventQueue<State>,
-}
-
-impl WlrootsConsumer {
-    pub fn new() -> Result<Self> {
-        let conn = Connection::connect_to_env().unwrap();
-        let (globals, queue) = registry_queue_init::<State>(&conn).unwrap();
-        let qh = queue.handle();
-
-        let seat: wl_seat::WlSeat = match globals.bind(&qh, 7..=8, ()) {
-            Ok(wl_seat) => wl_seat,
-            Err(_) => return Err(anyhow!("wl_seat >= v7 not supported")),
-        };
-
-        let vpm: Result<VpManager, BindError> = globals.bind(&qh, 1..=1, ());
-        let vkm: Result<VkManager, BindError> = globals.bind(&qh, 1..=1, ());
-        let fake_input: Result<OrgKdeKwinFakeInput, BindError> = globals.bind(&qh, 4..=4, ());
-
-        let virtual_input_manager = match (vpm, vkm, fake_input) {
-            (Ok(vpm), Ok(vkm), _) => VirtualInputManager::Wlroots { vpm, vkm },
-            (_, _, Ok(fake_input)) => {
-                fake_input.authenticate(
-                    "lan-mouse".into(),
-                    "Allow remote clients to control this device".into(),
-                );
-                VirtualInputManager::Kde { fake_input }
-            }
-            (Err(e1), Err(e2), Err(e3)) => {
-                log::warn!("zwlr_virtual_pointer_v1: {e1}");
-                log::warn!("zwp_virtual_keyboard_v1: {e2}");
-                log::warn!("org_kde_kwin_fake_input: {e3}");
-                log::error!("neither wlroots nor kde input emulation protocol supported!");
-                return Err(anyhow!("could not create event consumer"));
-            }
-            _ => {
-                panic!()
-            }
-        };
-
-        let input_for_client: HashMap<ClientHandle, VirtualInput> = HashMap::new();
-
-        let mut consumer = WlrootsConsumer {
-            state: State {
-                keymap: None,
-                input_for_client,
-                seat,
-                virtual_input_manager,
-                qh,
-            },
-            queue,
-        };
-        while consumer.state.keymap.is_none() {
-            consumer.queue.blocking_dispatch(&mut consumer.state).unwrap();
-        }
-        // let fd = unsafe { &File::from_raw_fd(consumer.state.keymap.unwrap().1.as_raw_fd()) };
-        // let mmap = unsafe { MmapOptions::new().map_copy(fd).unwrap() };
-        // log::debug!("{:?}", &mmap[..100]);
-        Ok(consumer)
-    }
-}
-
-impl State {
-    fn add_client(&mut self, client: ClientHandle) {
-        // create virtual input devices
-        match &self.virtual_input_manager {
-            VirtualInputManager::Wlroots { vpm, vkm } => {
-                let pointer: Vp = vpm.create_virtual_pointer(None, &self.qh, ());
-                let keyboard: Vk = vkm.create_virtual_keyboard(&self.seat, &self.qh, ());
-
-                // TODO: use server side keymap
-                if let Some((format, fd, size)) = self.keymap.as_ref() {
-                    keyboard.keymap(*format, fd.as_raw_fd(), *size);
-                } else {
-                    panic!("no keymap");
-                }
-
-                let vinput = VirtualInput::Wlroots { pointer, keyboard };
-
-                self.input_for_client.insert(client, vinput);
-            }
-            VirtualInputManager::Kde { fake_input } => {
-                let fake_input = fake_input.clone();
-                let vinput = VirtualInput::Kde { fake_input };
-                self.input_for_client.insert(client, vinput);
-            }
-        }
-    }
-}
-
-impl EventConsumer for WlrootsConsumer {
-    fn consume(&self, event: Event, client_handle: ClientHandle) {
-        if let Some(virtual_input) = self.state.input_for_client.get(&client_handle) {
-            virtual_input.consume_event(event).unwrap();
-            if let Err(e) = self.queue.flush() {
-                log::error!("{}", e);
-            }
-        }
-    }
-
-    fn notify(&mut self, client_event: ClientEvent) {
-        if let ClientEvent::Create(client, _) = client_event {
-            self.state.add_client(client);
-            if let Err(e) = self.queue.flush() {
-                log::error!("{}", e);
-            }
-        }
-    }
-}
-
-
-enum VirtualInput {
-    Wlroots { pointer: Vp, keyboard: Vk },
-    Kde { fake_input: OrgKdeKwinFakeInput },
-}
-
-impl VirtualInput {
-    fn consume_event(&self, event: Event) -> Result<(),()> {
-        match event {
-            Event::Pointer(e) => match e {
-                PointerEvent::Motion {
-                    time,
-                    relative_x,
-                    relative_y,
-                } => match self {
-                    VirtualInput::Wlroots {
-                        pointer,
-                        keyboard: _,
-                    } => {
-                        pointer.motion(time, relative_x, relative_y);
-                    }
-                    VirtualInput::Kde { fake_input } => {
-                        fake_input.pointer_motion(relative_y, relative_y);
-                    }
-                },
-                PointerEvent::Button {
-                    time,
-                    button,
-                    state,
-                } => {
-                    let state: ButtonState = state.try_into()?;
-                    match self {
-                        VirtualInput::Wlroots {
-                            pointer,
-                            keyboard: _,
-                        } => {
-                            pointer.button(time, button, state);
-                        }
-                        VirtualInput::Kde { fake_input } => {
-                            fake_input.button(button, state as u32);
-                        }
-                    }
-                }
-                PointerEvent::Axis { time, axis, value } => {
-                    let axis: Axis = (axis as u32).try_into()?;
-                    match self {
-                        VirtualInput::Wlroots {
-                            pointer,
-                            keyboard: _,
-                        } => {
-                            pointer.axis(time, axis, value);
-                            pointer.frame();
-                        }
-                        VirtualInput::Kde { fake_input } => {
-                            fake_input.axis(axis as u32, value);
-                        }
-                    }
-                }
-                PointerEvent::Frame {} => match self {
-                    VirtualInput::Wlroots {
-                        pointer,
-                        keyboard: _,
-                    } => {
-                        pointer.frame();
-                    }
-                    VirtualInput::Kde { fake_input: _ } => {}
-                },
-            },
-            Event::Keyboard(e) => match e {
-                KeyboardEvent::Key { time, key, state } => match self {
-                    VirtualInput::Wlroots {
-                        pointer: _,
-                        keyboard,
-                    } => {
-                        keyboard.key(time, key, state as u32);
-                    }
-                    VirtualInput::Kde { fake_input } => {
-                        fake_input.keyboard_key(key, state as u32);
-                    }
-                },
-                KeyboardEvent::Modifiers {
-                    mods_depressed,
-                    mods_latched,
-                    mods_locked,
-                    group,
-                } => match self {
-                    VirtualInput::Wlroots {
-                        pointer: _,
-                        keyboard,
-                    } => {
-                        keyboard.modifiers(mods_depressed, mods_latched, mods_locked, group);
-                    }
-                    VirtualInput::Kde { fake_input: _ } => {}
-                },
-            },
-            _ => {},
-        }
-        Ok(())
-    }
-}
-
-delegate_noop!(State: Vp);
-delegate_noop!(State: Vk);
-delegate_noop!(State: VpManager);
-delegate_noop!(State: VkManager);
-delegate_noop!(State: OrgKdeKwinFakeInput);
-
-impl Dispatch<wl_registry::WlRegistry, GlobalListContents> for State {
-    fn event(
-        _: &mut State,
-        _: &wl_registry::WlRegistry,
-        _: wl_registry::Event,
-        _: &GlobalListContents,
-        _: &Connection,
-        _: &QueueHandle<State>,
-    ) {
-    }
-}
-
-impl Dispatch<WlKeyboard, ()> for State {
-    fn event(
-        state: &mut Self,
-        _: &WlKeyboard,
-        event: <WlKeyboard as wayland_client::Proxy>::Event,
-        _: &(),
-        _: &Connection,
-        _: &QueueHandle<Self>,
-    ) {
-        match event {
-            wl_keyboard::Event::Keymap { format, fd, size } => {
-                state.keymap = Some((u32::from(format), fd, size));
-            }
-            _ => {},
-        }
-    }
-}
-
-impl Dispatch<WlSeat, ()> for State {
-    fn event(
-        _: &mut Self,
-        seat: &WlSeat,
-        event: <WlSeat as wayland_client::Proxy>::Event,
-        _: &(),
-        _: &Connection,
-        qhandle: &QueueHandle<Self>,
-    ) {
-        if let wl_seat::Event::Capabilities {
-            capabilities: WEnum::Value(capabilities),
-        } = event
-        {
-            if capabilities.contains(wl_seat::Capability::Keyboard) {
-                seat.get_keyboard(qhandle, ());
-            }
-        }
-    }
-}

src/backend/consumer/x11.rs

@@ -1,57 +0,0 @@
-use std::ptr;
-use x11::{xlib, xtest};
-
-use crate::{
-    client::ClientHandle,
-    event::Event, consumer::EventConsumer,
-};
-
-pub struct X11Consumer {
-    display: *mut xlib::Display,
-}
-
-impl X11Consumer {
-    pub fn new() -> Self {
-        let display = unsafe {
-            match xlib::XOpenDisplay(ptr::null()) {
-                d if d == ptr::null::<xlib::Display>() as *mut xlib::Display => None,
-                display => Some(display),
-            }
-        };
-        let display = display.expect("could not open display");
-        Self { display }
-    }
-
-    fn relative_motion(&self, dx: i32, dy: i32) {
-        unsafe {
-            xtest::XTestFakeRelativeMotionEvent(self.display, dx, dy, 0, 0);
-            xlib::XFlush(self.display);
-        }
-    }
-}
-
-impl EventConsumer for X11Consumer {
-    fn consume(&self, event: Event, _: ClientHandle) {
-        match event {
-            Event::Pointer(pointer_event) => match pointer_event {
-                crate::event::PointerEvent::Motion {
-                    time: _,
-                    relative_x,
-                    relative_y,
-                } => {
-                    self.relative_motion(relative_x as i32, relative_y as i32);
-                }
-                crate::event::PointerEvent::Button { .. } => {}
-                crate::event::PointerEvent::Axis { .. } => {}
-                crate::event::PointerEvent::Frame {} => {}
-            },
-            Event::Keyboard(_) => {}
-            _ => {}
-        }
-    }
-
-    fn notify(&mut self, _: crate::client::ClientEvent) {
-        // for our purposes it does not matter what client sent the event
-    }
-}
-

src/backend/consumer/xdg_desktop_portal.rs

@@ -1,15 +0,0 @@
-use crate::consumer::EventConsumer;
-
-pub struct DesktopPortalConsumer {}
-
-impl DesktopPortalConsumer {
-    pub fn new() -> Self { Self {  } }
-}
-
-impl EventConsumer for DesktopPortalConsumer {
-    fn consume(&self, _: crate::event::Event, _: crate::client::ClientHandle) {
-        log::error!("xdg_desktop_portal backend not yet implemented!");
-    }
-
-    fn notify(&mut self, _: crate::client::ClientEvent) {}
-}

src/backend/producer.rs

@@ -1,6 +0,0 @@
-#[cfg(all(unix, feature = "wayland"))]
-pub mod wayland;
-#[cfg(windows)]
-pub mod windows;
-#[cfg(all(unix, feature = "x11"))]
-pub mod x11;

src/backend/producer/wayland.rs

@@ -1,687 +0,0 @@
-use crate::{client::{ClientHandle, Position, ClientEvent}, producer::EventProducer};
-use mio::{event::Source, unix::SourceFd};
-
-use std::{os::fd::RawFd, vec::Drain, io::ErrorKind};
-use memmap::MmapOptions;
-use anyhow::{anyhow, Result};
-
-use std::{
-    fs::File,
-    io::{BufWriter, Write},
-    os::unix::prelude::{AsRawFd, FromRawFd},
-    rc::Rc,
-};
-
-use wayland_protocols::wp::{
-    keyboard_shortcuts_inhibit::zv1::client::{
-        zwp_keyboard_shortcuts_inhibit_manager_v1::ZwpKeyboardShortcutsInhibitManagerV1,
-        zwp_keyboard_shortcuts_inhibitor_v1::ZwpKeyboardShortcutsInhibitorV1,
-    },
-    pointer_constraints::zv1::client::{
-        zwp_locked_pointer_v1::ZwpLockedPointerV1,
-        zwp_pointer_constraints_v1::{Lifetime, ZwpPointerConstraintsV1},
-    },
-    relative_pointer::zv1::client::{
-        zwp_relative_pointer_manager_v1::ZwpRelativePointerManagerV1,
-        zwp_relative_pointer_v1::{self, ZwpRelativePointerV1},
-    },
-};
-
-use wayland_protocols_wlr::layer_shell::v1::client::{
-    zwlr_layer_shell_v1::{Layer, ZwlrLayerShellV1},
-    zwlr_layer_surface_v1::{self, Anchor, KeyboardInteractivity, ZwlrLayerSurfaceV1},
-};
-
-use wayland_client::{
-    backend::{WaylandError, ReadEventsGuard},
-    delegate_noop,
-    globals::{registry_queue_init, GlobalListContents},
-    protocol::{
-        wl_buffer, wl_compositor, wl_keyboard, wl_pointer, wl_region, wl_registry, wl_seat, wl_shm,
-        wl_shm_pool, wl_surface,
-    },
-    Connection, Dispatch, DispatchError, QueueHandle, WEnum, EventQueue,
-};
-
-use tempfile;
-
-use crate::event::{Event, KeyboardEvent, PointerEvent};
-
-struct Globals {
-    compositor: wl_compositor::WlCompositor,
-    pointer_constraints: ZwpPointerConstraintsV1,
-    relative_pointer_manager: ZwpRelativePointerManagerV1,
-    shortcut_inhibit_manager: ZwpKeyboardShortcutsInhibitManagerV1,
-    seat: wl_seat::WlSeat,
-    shm: wl_shm::WlShm,
-    layer_shell: ZwlrLayerShellV1,
-}
-
-struct State {
-    pointer_lock: Option<ZwpLockedPointerV1>,
-    rel_pointer: Option<ZwpRelativePointerV1>,
-    shortcut_inhibitor: Option<ZwpKeyboardShortcutsInhibitorV1>,
-    client_for_window: Vec<(Rc<Window>, ClientHandle)>,
-    focused: Option<(Rc<Window>, ClientHandle)>,
-    g: Globals,
-    wayland_fd: RawFd,
-    read_guard: Option<ReadEventsGuard>,
-    qh: QueueHandle<Self>,
-    pending_events: Vec<(ClientHandle, Event)>,
-}
-
-pub struct WaylandEventProducer {
-    state: State,
-    queue: EventQueue<State>,
-}
-
-struct Window {
-    buffer: wl_buffer::WlBuffer,
-    surface: wl_surface::WlSurface,
-    layer_surface: ZwlrLayerSurfaceV1,
-}
-
-impl Window {
-    fn new(g: &Globals, qh: &QueueHandle<State>, pos: Position) -> Window {
-        let (width, height) = (1, 1440);
-        let mut file = tempfile::tempfile().unwrap();
-        draw(&mut file, (width, height));
-        let pool = g
-            .shm
-            .create_pool(file.as_raw_fd(), (width * height * 4) as i32, qh, ());
-        let buffer = pool.create_buffer(
-            0,
-            width as i32,
-            height as i32,
-            (width * 4) as i32,
-            wl_shm::Format::Argb8888,
-            qh,
-            (),
-        );
-        let surface = g.compositor.create_surface(qh, ());
-
-        let layer_surface = g.layer_shell.get_layer_surface(
-            &surface,
-            None,
-            Layer::Top,
-            "LAN Mouse Sharing".into(),
-            qh,
-            (),
-        );
-        let anchor = match pos {
-            Position::Left => Anchor::Left,
-            Position::Right => Anchor::Right,
-            Position::Top => Anchor::Top,
-            Position::Bottom => Anchor::Bottom,
-        };
-
-        layer_surface.set_anchor(anchor);
-        layer_surface.set_size(1, 1440);
-        layer_surface.set_exclusive_zone(0);
-        layer_surface.set_margin(0, 0, 0, 0);
-        surface.set_input_region(None);
-        surface.commit();
-        Window {
-            buffer,
-            surface,
-            layer_surface,
-        }
-    }
-}
-
-fn draw(f: &mut File, (width, height): (u32, u32)) {
-    let mut buf = BufWriter::new(f);
-    for _ in 0..height {
-        for _ in 0..width {
-            buf.write_all(&0x44FbF1C7u32.to_ne_bytes()).unwrap();
-        }
-    }
-}
-
-impl WaylandEventProducer {
-    pub fn new() -> Result<Self> {
-        let conn = Connection::connect_to_env().expect("could not connect to wayland compositor");
-        let (g, queue) =
-            registry_queue_init::<State>(&conn).expect("failed to initialize wl_registry");
-        let qh = queue.handle();
-
-        let compositor: wl_compositor::WlCompositor = match g.bind(&qh, 4..=5, ()) {
-            Ok(compositor) => compositor,
-            Err(_) => return Err(anyhow!("wl_compositor >= v4 not supported")),
-        };
-
-        let shm: wl_shm::WlShm = match g.bind(&qh, 1..=1, ()) {
-            Ok(wl_shm) => wl_shm,
-            Err(_) => return Err(anyhow!("wl_shm v1 not supported")),
-        };
-
-        let layer_shell: ZwlrLayerShellV1 = match g.bind(&qh, 3..=4, ()) {
-            Ok(layer_shell) => layer_shell,
-            Err(_) => return Err(anyhow!("zwlr_layer_shell_v1 >= v3 not supported - required to display a surface at the edge of the screen")),
-        };
-
-        let seat: wl_seat::WlSeat = match g.bind(&qh, 7..=8, ()) {
-            Ok(wl_seat) => wl_seat,
-            Err(_) => return Err(anyhow!("wl_seat >= v7 not supported")),
-        };
-
-        let pointer_constraints: ZwpPointerConstraintsV1 = match g.bind(&qh, 1..=1, ()) {
-            Ok(pointer_constraints) => pointer_constraints,
-            Err(_) => return Err(anyhow!("zwp_pointer_constraints_v1 not supported")),
-        };
-
-        let relative_pointer_manager: ZwpRelativePointerManagerV1 = match g.bind(&qh, 1..=1, ()) {
-            Ok(relative_pointer_manager) => relative_pointer_manager,
-            Err(_) => return Err(anyhow!("zwp_relative_pointer_manager_v1 not supported")),
-        };
-
-        let shortcut_inhibit_manager: ZwpKeyboardShortcutsInhibitManagerV1 = match g.bind(&qh, 1..=1, ()) {
-            Ok(shortcut_inhibit_manager) => shortcut_inhibit_manager,
-            Err(_) => return Err(anyhow!("zwp_keyboard_shortcuts_inhibit_manager_v1 not supported")),
-        };
-
-        let g = Globals {
-            compositor,
-            shm,
-            layer_shell,
-            seat,
-            pointer_constraints,
-            relative_pointer_manager,
-            shortcut_inhibit_manager,
-        };
-
-        // flush outgoing events
-        queue.flush()?;
-
-        // prepare reading wayland events
-        let read_guard = queue.prepare_read()?;
-        let wayland_fd = read_guard.connection_fd().as_raw_fd();
-        let read_guard = Some(read_guard);
-
-        Ok(WaylandEventProducer {
-            queue,
-            state: State {
-                g,
-                pointer_lock: None,
-                rel_pointer: None,
-                shortcut_inhibitor: None,
-                client_for_window: Vec::new(),
-                focused: None,
-                qh,
-                wayland_fd,
-                read_guard,
-                pending_events: vec![],
-            }
-        })
-    }
-}
-
-impl State {
-    fn grab(
-        &mut self,
-        surface: &wl_surface::WlSurface,
-        pointer: &wl_pointer::WlPointer,
-        serial: u32,
-        qh: &QueueHandle<State>,
-    ) {
-        let (window, _) = self.focused.as_ref().unwrap();
-
-        // hide the cursor
-        pointer.set_cursor(serial, None, 0, 0);
-
-        // capture input
-        window
-            .layer_surface
-            .set_keyboard_interactivity(KeyboardInteractivity::Exclusive);
-        window.surface.commit();
-
-        // lock pointer
-        if self.pointer_lock.is_none() {
-            self.pointer_lock = Some(self.g.pointer_constraints.lock_pointer(
-                surface,
-                pointer,
-                None,
-                Lifetime::Persistent,
-                qh,
-                (),
-            ));
-        }
-
-        // request relative input
-        if self.rel_pointer.is_none() {
-            self.rel_pointer = Some(self.g.relative_pointer_manager.get_relative_pointer(
-                pointer,
-                qh,
-                (),
-            ));
-        }
-
-        // capture modifier keys
-        if self.shortcut_inhibitor.is_none() {
-            self.shortcut_inhibitor = Some(self.g.shortcut_inhibit_manager.inhibit_shortcuts(
-                surface,
-                &self.g.seat,
-                qh,
-                (),
-            ));
-        }
-    }
-
-    fn ungrab(&mut self) {
-        // get focused client
-        let (window, _client) = match self.focused.as_ref() {
-            Some(focused) => focused,
-            None => return,
-        };
-
-        // ungrab surface
-        window
-            .layer_surface
-            .set_keyboard_interactivity(KeyboardInteractivity::None);
-        window.surface.commit();
-
-        // destroy pointer lock
-        if let Some(pointer_lock) = &self.pointer_lock {
-            pointer_lock.destroy();
-            self.pointer_lock = None;
-        }
-
-        // destroy relative input
-        if let Some(rel_pointer) = &self.rel_pointer {
-            rel_pointer.destroy();
-            self.rel_pointer = None;
-        }
-
-        // destroy shortcut inhibitor
-        if let Some(shortcut_inhibitor) = &self.shortcut_inhibitor {
-            shortcut_inhibitor.destroy();
-            self.shortcut_inhibitor = None;
-        }
-    }
-
-    fn add_client(&mut self, client: ClientHandle, pos: Position) {
-        let window = Rc::new(Window::new(&self.g, &self.qh, pos));
-        self.client_for_window.push((window, client));
-    }
-}
-
-impl Source for WaylandEventProducer {
-    fn register(
-        &mut self,
-        registry: &mio::Registry,
-        token: mio::Token,
-        interests: mio::Interest,
-    ) -> std::io::Result<()> {
-        SourceFd(&self.state.wayland_fd).register(registry, token, interests)
-    }
-
-    fn reregister(
-        &mut self,
-        registry: &mio::Registry,
-        token: mio::Token,
-        interests: mio::Interest,
-    ) -> std::io::Result<()> {
-        SourceFd(&self.state.wayland_fd).reregister(registry, token, interests)
-    }
-
-    fn deregister(&mut self, registry: &mio::Registry) -> std::io::Result<()> {
-        SourceFd(&self.state.wayland_fd).deregister(registry)
-    }
-}
-impl WaylandEventProducer {
-    fn read(&mut self) -> bool {
-        match self.state.read_guard.take().unwrap().read() {
-            Ok(_) => true,
-            Err(WaylandError::Io(e)) if e.kind() == ErrorKind::WouldBlock => false,
-            Err(WaylandError::Io(e)) => {
-                log::error!("error reading from wayland socket: {e}");
-                false
-            }
-            Err(WaylandError::Protocol(e)) => {
-                panic!("wayland protocol violation: {e}")
-            }
-        }
-    }
-
-    fn prepare_read(&mut self) {
-        match self.queue.prepare_read() {
-            Ok(r) => self.state.read_guard = Some(r),
-            Err(WaylandError::Io(e)) => {
-                log::error!("error preparing read from wayland socket: {e}")
-            }
-            Err(WaylandError::Protocol(e)) => {
-                panic!("wayland Protocol violation: {e}")
-            }
-        };
-    }
-
-    fn dispatch_events(&mut self) {
-        match self.queue.dispatch_pending(&mut self.state) {
-            Ok(_) => {}
-            Err(DispatchError::Backend(WaylandError::Io(e))) => {
-                log::error!("Wayland Error: {}", e);
-            }
-            Err(DispatchError::Backend(e)) => {
-                panic!("backend error: {}", e);
-            }
-            Err(DispatchError::BadMessage {
-                sender_id,
-                interface,
-                opcode,
-            }) => {
-                panic!("bad message {}, {} , {}", sender_id, interface, opcode);
-            }
-        }
-    }
-
-    fn flush_events(&mut self) {
-        // flush outgoing events
-        match self.queue.flush() {
-            Ok(_) => (),
-            Err(e) => match e {
-                WaylandError::Io(e) => {
-                    log::error!("error writing to wayland socket: {e}")
-                },
-                WaylandError::Protocol(e) => {
-                    panic!("wayland protocol violation: {e}")
-                },
-            },
-        }
-    }
-}
-
-impl EventProducer for WaylandEventProducer {
-
-    fn read_events(&mut self) -> Drain<(ClientHandle, Event)> {
-        // read events
-        while self.read() {
-            // prepare next read
-            self.prepare_read();
-        }
-        // dispatch the events
-        self.dispatch_events();
-
-        // flush outgoing events
-        self.flush_events();
-
-        // prepare for the next read
-        self.prepare_read();
-
-        // return the events
-        self.state.pending_events.drain(..)
-    }
-
-    fn notify(&mut self, client_event: ClientEvent) {
-        if let ClientEvent::Create(handle, pos) = client_event {
-            self.state.add_client(handle, pos);
-            self.flush_events();
-        }
-    }
-
-    fn release(&mut self) {
-        self.state.ungrab();
-        self.flush_events();
-    }
-}
-
-impl Dispatch<wl_seat::WlSeat, ()> for State {
-    fn event(
-        _: &mut Self,
-        seat: &wl_seat::WlSeat,
-        event: <wl_seat::WlSeat as wayland_client::Proxy>::Event,
-        _: &(),
-        _: &Connection,
-        qh: &QueueHandle<Self>,
-    ) {
-        if let wl_seat::Event::Capabilities {
-            capabilities: WEnum::Value(capabilities),
-        } = event
-        {
-            if capabilities.contains(wl_seat::Capability::Pointer) {
-                seat.get_pointer(qh, ());
-            }
-            if capabilities.contains(wl_seat::Capability::Keyboard) {
-                seat.get_keyboard(qh, ());
-            }
-        }
-    }
-}
-
-impl Dispatch<wl_pointer::WlPointer, ()> for State {
-    fn event(
-        app: &mut Self,
-        pointer: &wl_pointer::WlPointer,
-        event: <wl_pointer::WlPointer as wayland_client::Proxy>::Event,
-        _: &(),
-        _: &Connection,
-        qh: &QueueHandle<Self>,
-    ) {
-
-        match event {
-            wl_pointer::Event::Enter {
-                serial,
-                surface,
-                surface_x: _,
-                surface_y: _,
-            } => {
-                // get client corresponding to the focused surface
-                log::trace!("produce: enter()");
-
-                {
-                    let (window, client) = app
-                        .client_for_window
-                        .iter()
-                        .find(|(w, _c)| w.surface == surface)
-                        .unwrap();
-                    app.focused = Some((window.clone(), *client));
-                    app.grab(&surface, pointer, serial.clone(), qh);
-                }
-                let (_, client) = app
-                    .client_for_window
-                    .iter()
-                    .find(|(w, _c)| w.surface == surface)
-                    .unwrap();
-                app.pending_events.push((*client, Event::Release()));
-            }
-            wl_pointer::Event::Leave { .. } => {
-                log::trace!("produce: leave()");
-                app.ungrab();
-            }
-            wl_pointer::Event::Button {
-                serial: _,
-                time,
-                button,
-                state,
-            } => {
-                log::trace!("produce: button()");
-                let (_, client) = app.focused.as_ref().unwrap();
-                app.pending_events.push((
-                    *client,
-                    Event::Pointer(PointerEvent::Button {
-                        time,
-                        button,
-                        state: u32::from(state),
-                    }),
-                ));
-            }
-            wl_pointer::Event::Axis { time, axis, value } => {
-                log::trace!("produce: scroll()");
-                let (_, client) = app.focused.as_ref().unwrap();
-                app.pending_events.push((
-                    *client,
-                    Event::Pointer(PointerEvent::Axis {
-                        time,
-                        axis: u32::from(axis) as u8,
-                        value,
-                    }),
-                ));
-            }
-            wl_pointer::Event::Frame {} => {
-                log::trace!("produce: frame()");
-                let (_, client) = app.focused.as_ref().unwrap();
-                app.pending_events.push((
-                    *client,
-                    Event::Pointer(PointerEvent::Frame {}),
-                ));
-            }
-            _ => {}
-        }
-    }
-}
-
-impl Dispatch<wl_keyboard::WlKeyboard, ()> for State {
-    fn event(
-        app: &mut Self,
-        _: &wl_keyboard::WlKeyboard,
-        event: wl_keyboard::Event,
-        _: &(),
-        _: &Connection,
-        _: &QueueHandle<Self>,
-    ) {
-        let (_window, client) = match &app.focused {
-            Some(focused) => (Some(&focused.0), Some(&focused.1)),
-            None => (None, None),
-        };
-        match event {
-            wl_keyboard::Event::Key {
-                serial: _,
-                time,
-                key,
-                state,
-            } => {
-                if let Some(client) = client {
-                    app.pending_events.push((
-                        *client,
-                        Event::Keyboard(KeyboardEvent::Key {
-                            time,
-                            key,
-                            state: u32::from(state) as u8,
-                        }),
-                    ));
-                }
-            }
-            wl_keyboard::Event::Modifiers {
-                serial: _,
-                mods_depressed,
-                mods_latched,
-                mods_locked,
-                group,
-            } => {
-                if let Some(client) = client {
-                    app.pending_events.push((
-                        *client,
-                        Event::Keyboard(KeyboardEvent::Modifiers {
-                            mods_depressed,
-                            mods_latched,
-                            mods_locked,
-                            group,
-                        }),
-                    ));
-                }
-                if mods_depressed == 77 {
-                    // ctrl shift super alt
-                    app.ungrab();
-                }
-            }
-            wl_keyboard::Event::Keymap {
-                format: _,
-                fd,
-                size: _,
-            } => {
-                let fd = unsafe { &File::from_raw_fd(fd.as_raw_fd()) };
-                let _mmap = unsafe { MmapOptions::new().map_copy(fd).unwrap() };
-                // TODO keymap
-            }
-            _ => (),
-        }
-    }
-}
-
-impl Dispatch<ZwpRelativePointerV1, ()> for State {
-    fn event(
-        app: &mut Self,
-        _: &ZwpRelativePointerV1,
-        event: <ZwpRelativePointerV1 as wayland_client::Proxy>::Event,
-        _: &(),
-        _: &Connection,
-        _: &QueueHandle<Self>,
-    ) {
-        if let zwp_relative_pointer_v1::Event::RelativeMotion {
-            utime_hi,
-            utime_lo,
-            dx: _,
-            dy: _,
-            dx_unaccel: surface_x,
-            dy_unaccel: surface_y,
-        } = event
-        {
-            log::trace!("produce: motion()");
-            if let Some((_window, client)) = &app.focused {
-                let time = (((utime_hi as u64) << 32 | utime_lo as u64) / 1000) as u32;
-                app.pending_events.push((
-                    *client,
-                    Event::Pointer(PointerEvent::Motion {
-                        time,
-                        relative_x: surface_x,
-                        relative_y: surface_y,
-                    }),
-                ));
-            }
-        }
-    }
-}
-
-impl Dispatch<ZwlrLayerSurfaceV1, ()> for State {
-    fn event(
-        app: &mut Self,
-        layer_surface: &ZwlrLayerSurfaceV1,
-        event: <ZwlrLayerSurfaceV1 as wayland_client::Proxy>::Event,
-        _: &(),
-        _: &Connection,
-        _: &QueueHandle<Self>,
-    ) {
-        if let zwlr_layer_surface_v1::Event::Configure { serial, .. } = event {
-            let (window, _client) = app
-                .client_for_window
-                .iter()
-                .find(|(w, _c)| &w.layer_surface == layer_surface)
-                .unwrap();
-            // client corresponding to the layer_surface
-            let surface = &window.surface;
-            let buffer = &window.buffer;
-            surface.attach(Some(&buffer), 0, 0);
-            layer_surface.ack_configure(serial);
-            surface.commit();
-        }
-    }
-}
-
-// delegate wl_registry events to App itself
-// delegate_dispatch!(App: [wl_registry::WlRegistry: GlobalListContents] => App);
-impl Dispatch<wl_registry::WlRegistry, GlobalListContents> for State {
-    fn event(
-        _state: &mut Self,
-        _proxy: &wl_registry::WlRegistry,
-        _event: <wl_registry::WlRegistry as wayland_client::Proxy>::Event,
-        _data: &GlobalListContents,
-        _conn: &Connection,
-        _qhandle: &QueueHandle<Self>,
-    ) {
-    }
-}
-
-// don't emit any events
-delegate_noop!(State: wl_region::WlRegion);
-delegate_noop!(State: wl_shm_pool::WlShmPool);
-delegate_noop!(State: wl_compositor::WlCompositor);
-delegate_noop!(State: ZwlrLayerShellV1);
-delegate_noop!(State: ZwpRelativePointerManagerV1);
-delegate_noop!(State: ZwpKeyboardShortcutsInhibitManagerV1);
-delegate_noop!(State: ZwpPointerConstraintsV1);
-
-// ignore events
-delegate_noop!(State: ignore wl_shm::WlShm);
-delegate_noop!(State: ignore wl_buffer::WlBuffer);
-delegate_noop!(State: ignore wl_surface::WlSurface);
-delegate_noop!(State: ignore ZwpKeyboardShortcutsInhibitorV1);
-delegate_noop!(State: ignore ZwpLockedPointerV1);

src/backend/producer/windows.rs

@@ -1,58 +0,0 @@
-use std::vec::Drain;
-
-use mio::{Token, Registry};
-use mio::event::Source;
-use std::io::Result;
-
-use crate::{
-    client::{ClientHandle, ClientEvent},
-    event::Event,
-    producer::EventProducer,
-};
-
-pub struct WindowsProducer {
-    pending_events: Vec<(ClientHandle, Event)>,
-}
-
-impl Source for WindowsProducer {
-    fn register(
-        &mut self,
-        _registry: &Registry,
-        _token: Token,
-        _interests: mio::Interest,
-    ) -> Result<()> {
-        Ok(())
-    }
-
-    fn reregister(
-        &mut self,
-        _registry: &Registry,
-        _token: Token,
-        _interests: mio::Interest,
-    ) -> Result<()> {
-        Ok(())
-    }
-
-    fn deregister(&mut self, _registry: &Registry) -> Result<()> {
-        Ok(())
-    }
-}
-
-
-impl EventProducer for WindowsProducer {
-    fn notify(&mut self, _: ClientEvent) { }
-
-    fn read_events(&mut self) -> Drain<(ClientHandle, Event)> {
-        self.pending_events.drain(..)
-    }
-
-    fn release(&mut self) { }
-}
-
-impl WindowsProducer {
-    pub(crate) fn new() -> Self {
-        Self {
-            pending_events: vec![],
-        }
-    }
-}

src/backend/producer/x11.rs

@@ -1,55 +0,0 @@
-use std::vec::Drain;
-
-use mio::{Token, Registry};
-use mio::event::Source;
-use std::io::Result;
-
-use crate::producer::EventProducer;
-
-use crate::{client::{ClientHandle, ClientEvent}, event::Event};
-
-pub struct X11Producer {
-    pending_events: Vec<(ClientHandle, Event)>,
-}
-
-impl X11Producer {
-    pub fn new() -> Self {
-        Self {
-            pending_events: vec![],
-        }
-    }
-}
-
-impl Source for X11Producer {
-    fn register(
-        &mut self,
-        _registry: &Registry,
-        _token: Token,
-        _interests: mio::Interest,
-    ) -> Result<()> {
-        Ok(())
-    }
-
-    fn reregister(
-        &mut self,
-        _registry: &Registry,
-        _token: Token,
-        _interests: mio::Interest,
-    ) -> Result<()> {
-        Ok(())
-    }
-
-    fn deregister(&mut self, _registry: &Registry) -> Result<()> {
-        Ok(())
-    }
-}
-
-impl EventProducer for X11Producer {
-    fn notify(&mut self, _: ClientEvent) { }
-
-    fn read_events(&mut self) -> Drain<(ClientHandle, Event)> {
-        self.pending_events.drain(..)
-    }
-
-    fn release(&mut self) {}
-}

src/capture_test.rs

@@ -0,0 +1,54 @@
+use crate::config::Config;
+use futures::StreamExt;
+use input_capture::{self, CaptureError, InputCapture, InputCaptureError, Position};
+use input_event::{Event, KeyboardEvent};
+use tokio::task::LocalSet;
+
+pub fn run() -> anyhow::Result<()> {
+    log::info!("running input capture test");
+    let runtime = tokio::runtime::Builder::new_current_thread()
+        .enable_io()
+        .enable_time()
+        .build()?;
+
+    let config = Config::new()?;
+
+    Ok(runtime.block_on(LocalSet::new().run_until(input_capture_test(config)))?)
+}
+
+async fn input_capture_test(config: Config) -> Result<(), InputCaptureError> {
+    log::info!("creating input capture");
+    let backend = config.capture_backend.map(|b| b.into());
+    loop {
+        let mut input_capture = input_capture::create(backend).await?;
+        log::info!("creating clients");
+        input_capture.create(0, Position::Left).await?;
+        input_capture.create(1, Position::Right).await?;
+        input_capture.create(2, Position::Top).await?;
+        input_capture.create(3, Position::Bottom).await?;
+        if let Err(e) = do_capture(&mut input_capture).await {
+            log::warn!("{e} - recreating capture");
+        }
+        let _ = input_capture.terminate().await;
+    }
+}
+
+async fn do_capture(input_capture: &mut Box<dyn InputCapture>) -> Result<(), CaptureError> {
+    loop {
+        let (client, event) = input_capture
+            .next()
+            .await
+            .ok_or(CaptureError::EndOfStream)??;
+        let pos = match client {
+            0 => Position::Left,
+            1 => Position::Right,
+            2 => Position::Top,
+            _ => Position::Bottom,
+        };
+        log::info!("position: {pos}, event: {event}");
+        if let Event::Keyboard(KeyboardEvent::Key { key: 1, .. }) = event {
+            input_capture.release().await?;
+            break Ok(());
+        }
+    }
+}

src/client.rs

@@ -1,190 +1,201 @@
-use std::{net::SocketAddr, collections::{HashSet, hash_set::Iter}, fmt::Display, time::{Instant, Duration}, iter::Cloned};
+use std::{
+    collections::HashSet,
+    fmt::Display,
+    net::{IpAddr, SocketAddr},
+    str::FromStr,
+};
 
-use serde::{Serialize, Deserialize};
+use serde::{Deserialize, Serialize};
+use slab::Slab;
+use thiserror::Error;
 
-#[derive(Debug, Eq, Hash, PartialEq, Clone, Copy, Serialize, Deserialize)]
+use crate::config::DEFAULT_PORT;
+use input_capture;
+
+#[derive(Debug, Default, Eq, Hash, PartialEq, Clone, Copy, Serialize, Deserialize)]
 pub enum Position {
+    #[default]
     Left,
     Right,
     Top,
     Bottom,
 }
+
+impl From<Position> for input_capture::Position {
+    fn from(position: Position) -> input_capture::Position {
+        match position {
+            Position::Left => input_capture::Position::Left,
+            Position::Right => input_capture::Position::Right,
+            Position::Top => input_capture::Position::Top,
+            Position::Bottom => input_capture::Position::Bottom,
+        }
+    }
+}
+
+#[derive(Debug, Error)]
+#[error("not a valid position: {pos}")]
+pub struct PositionParseError {
+    pos: String,
+}
+
+impl FromStr for Position {
+    type Err = PositionParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "left" => Ok(Self::Left),
+            "right" => Ok(Self::Right),
+            "top" => Ok(Self::Top),
+            "bottom" => Ok(Self::Bottom),
+            _ => Err(PositionParseError { pos: s.into() }),
+        }
+    }
+}
+
 impl Display for Position {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", match self {
-            Position::Left => "left",
-            Position::Right => "right",
-            Position::Top => "top",
-            Position::Bottom => "bottom",
-        })
+        write!(
+            f,
+            "{}",
+            match self {
+                Position::Left => "left",
+                Position::Right => "right",
+                Position::Top => "top",
+                Position::Bottom => "bottom",
+            }
+        )
+    }
+}
+
+impl TryFrom<&str> for Position {
+    type Error = ();
+
+    fn try_from(s: &str) -> Result<Self, Self::Error> {
+        match s {
+            "left" => Ok(Position::Left),
+            "right" => Ok(Position::Right),
+            "top" => Ok(Position::Top),
+            "bottom" => Ok(Position::Bottom),
+            _ => Err(()),
+        }
     }
 }
 
 #[derive(Debug, Eq, PartialEq, Clone, Serialize, Deserialize)]
-pub struct Client {
-    /// handle to refer to the client.
-    /// This way any event consumer / producer backend does not
-    /// need to know anything about a client other than its handle.
-    pub handle: ClientHandle,
+pub struct ClientConfig {
+    /// hostname of this client
+    pub hostname: Option<String>,
+    /// fix ips, determined by the user
+    pub fix_ips: Vec<IpAddr>,
+    /// both active_addr and addrs can be None / empty so port needs to be stored seperately
+    pub port: u16,
+    /// position of a client on screen
+    pub pos: Position,
+    /// enter hook
+    pub cmd: Option<String>,
+}
+
+impl Default for ClientConfig {
+    fn default() -> Self {
+        Self {
+            port: DEFAULT_PORT,
+            hostname: Default::default(),
+            fix_ips: Default::default(),
+            pos: Default::default(),
+            cmd: None,
+        }
+    }
+}
+
+pub type ClientHandle = u64;
+
+#[derive(Debug, Default, Clone, Serialize, Deserialize)]
+pub struct ClientState {
+    /// events should be sent to and received from the client
+    pub active: bool,
     /// `active` address of the client, used to send data to.
     /// This should generally be the socket address where data
     /// was last received from.
     pub active_addr: Option<SocketAddr>,
-    /// all socket addresses associated with a particular client
+    /// tracks whether or not the client is responding to pings
+    pub alive: bool,
+    /// ips from dns
+    pub dns_ips: Vec<IpAddr>,
+    /// all ip addresses associated with a particular client
     /// e.g. Laptops usually have at least an ethernet and a wifi port
     /// which have different ip addresses
-    pub addrs: HashSet<SocketAddr>,
-    /// position of a client on screen
-    pub pos: Position,
+    pub ips: HashSet<IpAddr>,
+    /// keys currently pressed by this client
+    pub pressed_keys: HashSet<u32>,
+    /// dns resolving in progress
+    pub resolving: bool,
 }
 
-pub enum ClientEvent {
-    Create(ClientHandle, Position),
-    Destroy(ClientHandle),
-    UpdatePos(ClientHandle, Position),
-    AddAddr(ClientHandle, SocketAddr),
-    RemoveAddr(ClientHandle, SocketAddr),
-}
-
-pub type ClientHandle = u32;
-
+#[derive(Default)]
 pub struct ClientManager {
-    /// probably not beneficial to use a hashmap here
-    clients: Vec<Client>,
-    last_ping: Vec<(ClientHandle, Option<Instant>)>,
-    last_seen: Vec<(ClientHandle, Option<Instant>)>,
-    last_replied:  Vec<(ClientHandle, Option<Instant>)>,
-    next_client_id: u32,
+    clients: Slab<(ClientConfig, ClientState)>,
 }
 
 impl ClientManager {
-    pub fn new() -> Self {
-        Self {
-            clients: vec![],
-            next_client_id: 0,
-            last_ping: vec![],
-            last_seen: vec![],
-            last_replied: vec![],
-        }
-    }
-
     /// add a new client to this manager
-    pub fn add_client(&mut self, addrs: HashSet<SocketAddr>, pos: Position) -> ClientHandle {
-        let handle = self.next_id();
-        // we dont know, which IP is initially active
-        let active_addr = None;
-
-        // store the client
-        let client = Client { handle, active_addr, addrs, pos };
-        self.clients.push(client);
-        self.last_ping.push((handle, None));
-        self.last_seen.push((handle, None));
-        self.last_replied.push((handle, None));
-        handle
-    }
-
-    /// add a socket address to the given client
-    pub fn add_addr(&mut self, client: ClientHandle, addr: SocketAddr) {
-        if let Some(client) = self.get_mut(client) {
-            client.addrs.insert(addr);
-        }
-    }
-
-    /// remove socket address from the given client
-    pub fn remove_addr(&mut self, client: ClientHandle, addr: SocketAddr) {
-        if let Some(client) = self.get_mut(client) {
-            client.addrs.remove(&addr);
-        }
-    }
-
-    pub fn set_default_addr(&mut self, client: ClientHandle, addr: SocketAddr) {
-        if let Some(client) = self.get_mut(client) {
-            client.active_addr = Some(addr)
-        }
-    }
-
-    /// update the position of a client
-    pub fn update_pos(&mut self, client: ClientHandle, pos: Position) {
-        if let Some(client) = self.get_mut(client) {
-            client.pos = pos;
-        }
-    }
-
-    pub fn get_active_addr(&self, client: ClientHandle) -> Option<SocketAddr> {
-        self.get(client)?.active_addr
-    }
-
-    pub fn get_addrs(&self, client: ClientHandle) -> Option<Cloned<Iter<'_, SocketAddr>>> {
-        Some(self.get(client)?.addrs.iter().cloned())
-    }
-
-    pub fn last_ping(&self, client: ClientHandle) -> Option<Duration> {
-        let last_ping = self.last_ping
-            .iter()
-            .find(|(c,_)| *c == client)
-            .unwrap().1;
-        last_ping.map(|p| p.elapsed())
-    }
-
-    pub fn last_seen(&self, client: ClientHandle) -> Option<Duration> {
-        let last_seen = self.last_seen
-            .iter()
-            .find(|(c, _)| *c == client)
-            .unwrap().1;
-        last_seen.map(|t| t.elapsed())
-    }
-
-    pub fn last_replied(&self, client: ClientHandle) -> Option<Duration> {
-        let last_replied = self.last_replied
-            .iter()
-            .find(|(c, _)| *c == client)
-            .unwrap().1;
-        last_replied.map(|t| t.elapsed())
-    }
-
-    pub fn reset_last_ping(&mut self, client: ClientHandle) {
-        self.last_ping
-            .iter_mut()
-            .find(|(c, _)| *c == client)
-            .unwrap().1 = Some(Instant::now());
-    }
-
-    pub fn reset_last_seen(&mut self, client: ClientHandle) {
-        self.last_seen
-            .iter_mut()
-            .find(|(c, _)| *c == client)
-            .unwrap().1 = Some(Instant::now());
-    }
-
-    pub fn reset_last_replied(&mut self, client: ClientHandle) {
-        self.last_replied
-            .iter_mut()
-            .find(|(c, _)| *c == client)
-            .unwrap().1 = Some(Instant::now());
+    pub fn add_client(&mut self) -> ClientHandle {
+        self.clients.insert(Default::default()) as ClientHandle
     }
 
+    /// find a client by its address
     pub fn get_client(&self, addr: SocketAddr) -> Option<ClientHandle> {
+        // since there shouldn't be more than a handful of clients at any given
+        // time this is likely faster than using a HashMap
         self.clients
             .iter()
-            .find(|c| c.addrs.contains(&addr))
-            .map(|c| c.handle)
+            .find_map(|(k, (_, s))| {
+                if s.active && s.ips.contains(&addr.ip()) {
+                    Some(k)
+                } else {
+                    None
+                }
+            })
+            .map(|p| p as ClientHandle)
     }
 
-    fn next_id(&mut self) -> ClientHandle {
-        let handle = self.next_client_id;
-        self.next_client_id += 1;
-        handle
-    }
-
-    fn get<'a>(&'a self, client: ClientHandle) -> Option<&'a Client> {
+    pub fn find_client(&self, pos: Position) -> Option<ClientHandle> {
         self.clients
             .iter()
-            .find(|c| c.handle == client)
+            .find_map(|(k, (c, s))| {
+                if s.active && c.pos == pos {
+                    Some(k)
+                } else {
+                    None
+                }
+            })
+            .map(|p| p as ClientHandle)
     }
 
-    fn get_mut<'a>(&'a mut self, client: ClientHandle) -> Option<&'a mut Client> {
-        self.clients
-            .iter_mut()
-            .find(|c| c.handle == client)
+    /// remove a client from the list
+    pub fn remove_client(&mut self, client: ClientHandle) -> Option<(ClientConfig, ClientState)> {
+        // remove id from occupied ids
+        self.clients.try_remove(client as usize)
+    }
+
+    // returns an immutable reference to the client state corresponding to `client`
+    pub fn get(&self, handle: ClientHandle) -> Option<&(ClientConfig, ClientState)> {
+        self.clients.get(handle as usize)
+    }
+
+    /// returns a mutable reference to the client state corresponding to `client`
+    pub fn get_mut(&mut self, handle: ClientHandle) -> Option<&mut (ClientConfig, ClientState)> {
+        self.clients.get_mut(handle as usize)
+    }
+
+    pub fn get_client_states(
+        &self,
+    ) -> impl Iterator<Item = (ClientHandle, &(ClientConfig, ClientState))> {
+        self.clients.iter().map(|(k, v)| (k as ClientHandle, v))
+    }
+
+    pub fn get_client_states_mut(
+        &mut self,
+    ) -> impl Iterator<Item = (ClientHandle, &mut (ClientConfig, ClientState))> {
+        self.clients.iter_mut().map(|(k, v)| (k as ClientHandle, v))
     }
 }

src/config.rs

@@ -1,118 +1,293 @@
+use anyhow::Result;
+use clap::{Parser, ValueEnum};
 use serde::{Deserialize, Serialize};
-use core::fmt;
 use std::collections::HashSet;
-use std::net::{IpAddr, SocketAddr};
-use std::{error::Error, fs};
-
 use std::env;
+use std::fmt::Display;
+use std::net::IpAddr;
+use std::{error::Error, fs};
 use toml;
 
 use crate::client::Position;
-use crate::dns;
+
+use input_event::scancode::{
+    self,
+    Linux::{KeyLeftAlt, KeyLeftCtrl, KeyLeftMeta, KeyLeftShift},
+};
 
 pub const DEFAULT_PORT: u16 = 4242;
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct ConfigToml {
+    pub capture_backend: Option<CaptureBackend>,
+    pub emulation_backend: Option<EmulationBackend>,
     pub port: Option<u16>,
-    pub frontend: Option<String>,
-    pub left: Option<Client>,
-    pub right: Option<Client>,
-    pub top: Option<Client>,
-    pub bottom: Option<Client>,
+    pub frontend: Option<Frontend>,
+    pub release_bind: Option<Vec<scancode::Linux>>,
+    pub left: Option<TomlClient>,
+    pub right: Option<TomlClient>,
+    pub top: Option<TomlClient>,
+    pub bottom: Option<TomlClient>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
-pub struct Client {
+pub struct TomlClient {
+    pub capture_backend: Option<CaptureBackend>,
+    pub hostname: Option<String>,
     pub host_name: Option<String>,
     pub ips: Option<Vec<IpAddr>>,
     pub port: Option<u16>,
+    pub activate_on_startup: Option<bool>,
+    pub enter_hook: Option<String>,
 }
 
-#[derive(Debug, Clone)]
-struct MissingParameter {
-    arg: &'static str,
-}
-
-impl fmt::Display for MissingParameter {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "Missing a parameter for argument: {}", self.arg)
-    }
-}
-
-impl Error for MissingParameter {}
-
 impl ConfigToml {
     pub fn new(path: &str) -> Result<ConfigToml, Box<dyn Error>> {
         let config = fs::read_to_string(path)?;
+        log::info!("using config: \"{path}\"");
         Ok(toml::from_str::<_>(&config)?)
     }
 }
 
-fn find_arg(key: &'static str) -> Result<Option<String>, MissingParameter> {
-    let args: Vec<String> = env::args().collect();
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+struct CliArgs {
+    /// the listen port for lan-mouse
+    #[arg(short, long)]
+    port: Option<u16>,
 
-    for (i, arg) in args.iter().enumerate() {
-        if arg != key {
-            continue;
-        }
-        match args.get(i+1) {
-            None => return Err(MissingParameter { arg: key }),
-            Some(arg) => return Ok(Some(arg.clone())),
-        };
-    }
-    Ok(None)
+    /// the frontend to use [cli | gtk]
+    #[arg(short, long)]
+    frontend: Option<Frontend>,
+
+    /// non-default config file location
+    #[arg(short, long)]
+    config: Option<String>,
+
+    /// run only the service as a daemon without the frontend
+    #[arg(short, long)]
+    daemon: bool,
+
+    /// test input capture
+    #[arg(long)]
+    test_capture: bool,
+
+    /// test input emulation
+    #[arg(long)]
+    test_emulation: bool,
+
+    /// capture backend override
+    #[arg(long)]
+    capture_backend: Option<CaptureBackend>,
+
+    /// emulation backend override
+    #[arg(long)]
+    emulation_backend: Option<EmulationBackend>,
 }
 
+#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize, ValueEnum)]
+pub enum CaptureBackend {
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    InputCapturePortal,
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    LayerShell,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl Display for CaptureBackend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            CaptureBackend::InputCapturePortal => write!(f, "input-capture-portal"),
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            CaptureBackend::LayerShell => write!(f, "layer-shell"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            CaptureBackend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            CaptureBackend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            CaptureBackend::MacOs => write!(f, "MacOS"),
+            CaptureBackend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+impl From<CaptureBackend> for input_capture::Backend {
+    fn from(backend: CaptureBackend) -> Self {
+        match backend {
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            CaptureBackend::InputCapturePortal => Self::InputCapturePortal,
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            CaptureBackend::LayerShell => Self::LayerShell,
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            CaptureBackend::X11 => Self::X11,
+            #[cfg(windows)]
+            CaptureBackend::Windows => Self::Windows,
+            #[cfg(target_os = "macos")]
+            CaptureBackend::MacOs => Self::MacOs,
+            CaptureBackend::Dummy => Self::Dummy,
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize, ValueEnum)]
+pub enum EmulationBackend {
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    Wlroots,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    Libei,
+    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+    Xdp,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl From<EmulationBackend> for input_emulation::Backend {
+    fn from(backend: EmulationBackend) -> Self {
+        match backend {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            EmulationBackend::Wlroots => Self::Wlroots,
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            EmulationBackend::Libei => Self::Libei,
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            EmulationBackend::Xdp => Self::Xdp,
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            EmulationBackend::X11 => Self::X11,
+            #[cfg(windows)]
+            EmulationBackend::Windows => Self::Windows,
+            #[cfg(target_os = "macos")]
+            EmulationBackend::MacOs => Self::MacOs,
+            EmulationBackend::Dummy => Self::Dummy,
+        }
+    }
+}
+
+impl Display for EmulationBackend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            EmulationBackend::Wlroots => write!(f, "wlroots"),
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            EmulationBackend::Libei => write!(f, "libei"),
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            EmulationBackend::Xdp => write!(f, "xdg-desktop-portal"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            EmulationBackend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            EmulationBackend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            EmulationBackend::MacOs => write!(f, "macos"),
+            EmulationBackend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, PartialEq, Eq, Serialize, ValueEnum)]
 pub enum Frontend {
     Gtk,
     Cli,
 }
 
-pub struct Config {
-    pub frontend: Frontend,
-    pub port: u16,
-    pub clients: Vec<(Client, Position)>,
+impl Default for Frontend {
+    fn default() -> Self {
+        if cfg!(feature = "gtk") {
+            Self::Gtk
+        } else {
+            Self::Cli
+        }
+    }
 }
 
+#[derive(Debug)]
+pub struct Config {
+    pub capture_backend: Option<CaptureBackend>,
+    pub emulation_backend: Option<EmulationBackend>,
+    pub frontend: Frontend,
+    pub port: u16,
+    pub clients: Vec<(TomlClient, Position)>,
+    pub daemon: bool,
+    pub release_bind: Vec<scancode::Linux>,
+    pub test_capture: bool,
+    pub test_emulation: bool,
+}
+
+pub struct ConfigClient {
+    pub ips: HashSet<IpAddr>,
+    pub hostname: Option<String>,
+    pub port: u16,
+    pub pos: Position,
+    pub active: bool,
+    pub enter_hook: Option<String>,
+}
+
+const DEFAULT_RELEASE_KEYS: [scancode::Linux; 4] =
+    [KeyLeftCtrl, KeyLeftShift, KeyLeftMeta, KeyLeftAlt];
+
 impl Config {
-    pub fn new() -> Result<Self, Box<dyn Error>> {
-        let config_path = "config.toml";
-        let config_toml = match ConfigToml::new(config_path) {
+    pub fn new() -> Result<Self> {
+        let args = CliArgs::parse();
+        let config_file = "config.toml";
+        #[cfg(unix)]
+        let config_path = {
+            let xdg_config_home =
+                env::var("XDG_CONFIG_HOME").unwrap_or(format!("{}/.config", env::var("HOME")?));
+            format!("{xdg_config_home}/lan-mouse/{config_file}")
+        };
+
+        #[cfg(not(unix))]
+        let config_path = {
+            let app_data =
+                env::var("LOCALAPPDATA").unwrap_or(format!("{}/.config", env::var("USERPROFILE")?));
+            format!("{app_data}\\lan-mouse\\{config_file}")
+        };
+
+        // --config <file> overrules default location
+        let config_path = args.config.unwrap_or(config_path);
+
+        let config_toml = match ConfigToml::new(config_path.as_str()) {
             Err(e) => {
-                log::error!("config.toml: {e}");
+                log::warn!("{config_path}: {e}");
                 log::warn!("Continuing without config file ...");
                 None
-            },
+            }
             Ok(c) => Some(c),
         };
 
-        let frontend = match find_arg("--frontend")? {
-            None => match &config_toml {
-                Some(c) => c.frontend.clone(),
-                None => None,
-            },
-            frontend => frontend,
-        };
+        let frontend_arg = args.frontend;
+        let frontend_cfg = config_toml.as_ref().and_then(|c| c.frontend);
+        let frontend = frontend_arg.or(frontend_cfg).unwrap_or_default();
 
-        let frontend = match frontend {
-            None => Frontend::Cli,
-            Some(s) => match s.as_str() {
-                "cli" => Frontend::Cli,
-                "gtk" => Frontend::Gtk,
-                    _ => Frontend::Cli,
-            }
-        };
+        let port = args
+            .port
+            .or(config_toml.as_ref().and_then(|c| c.port))
+            .unwrap_or(DEFAULT_PORT);
 
-        let port = match find_arg("--port")? {
-            Some(port) => port.parse::<u16>()?,
-            None => match &config_toml {
-                Some(c) => c.port.unwrap_or(DEFAULT_PORT),
-                None => DEFAULT_PORT,
-            }
-        };
+        log::debug!("{config_toml:?}");
+        let release_bind = config_toml
+            .as_ref()
+            .and_then(|c| c.release_bind.clone())
+            .unwrap_or(Vec::from_iter(DEFAULT_RELEASE_KEYS.iter().cloned()));
 
-        let mut clients: Vec<(Client, Position)> = vec![];
+        let capture_backend = args
+            .capture_backend
+            .or(config_toml.as_ref().and_then(|c| c.capture_backend));
+
+        let emulation_backend = args
+            .emulation_backend
+            .or(config_toml.as_ref().and_then(|c| c.emulation_backend));
+
+        let mut clients: Vec<(TomlClient, Position)> = vec![];
 
         if let Some(config_toml) = config_toml {
             if let Some(c) = config_toml.right {
@@ -129,43 +304,48 @@ impl Config {
             }
         }
 
-        Ok(Config { frontend, clients, port })
+        let daemon = args.daemon;
+        let test_capture = args.test_capture;
+        let test_emulation = args.test_emulation;
+
+        Ok(Config {
+            capture_backend,
+            emulation_backend,
+            daemon,
+            frontend,
+            clients,
+            port,
+            release_bind,
+            test_capture,
+            test_emulation,
+        })
     }
 
-    pub fn get_clients(&self) -> Vec<(HashSet<SocketAddr>, Option<String>,  Position)> {
-        self.clients.iter().map(|(c,p)| {
-            let port = c.port.unwrap_or(DEFAULT_PORT);
-            // add ips from config
-            let config_ips: Vec<IpAddr> = if let Some(ips) = c.ips.as_ref() {
-                ips.iter().cloned().collect()
-            } else {
-                vec![]
-            };
-            let host_name = c.host_name.clone();
-            // add ips from dns lookup
-            let dns_ips = match host_name.as_ref() {
-                None => vec![],
-                Some(host_name) => match dns::resolve(host_name) {
-                    Err(e) => {
-                        log::warn!("{host_name}: could not resolve host: {e}");
-                        vec![]
-                    }
-                    Ok(l) if l.is_empty() => {
-                        log::warn!("{host_name}: could not resolve host");
-                        vec![]
-                    }
-                    Ok(l) => l,
+    pub fn get_clients(&self) -> Vec<ConfigClient> {
+        self.clients
+            .iter()
+            .map(|(c, pos)| {
+                let port = c.port.unwrap_or(DEFAULT_PORT);
+                let ips: HashSet<IpAddr> = if let Some(ips) = c.ips.as_ref() {
+                    HashSet::from_iter(ips.iter().cloned())
+                } else {
+                    HashSet::new()
+                };
+                let hostname = match &c.hostname {
+                    Some(h) => Some(h.clone()),
+                    None => c.host_name.clone(),
+                };
+                let active = c.activate_on_startup.unwrap_or(false);
+                let enter_hook = c.enter_hook.clone();
+                ConfigClient {
+                    ips,
+                    hostname,
+                    port,
+                    pos: *pos,
+                    active,
+                    enter_hook,
                 }
-            };
-            if config_ips.is_empty() && dns_ips.is_empty() {
-                log::error!("no ips found for client {p:?}, ignoring!");
-                log::error!("You can manually specify ip addresses via the `ips` config option");
-            }
-            let ips = config_ips.into_iter().chain(dns_ips.into_iter());
-
-            // map ip addresses to socket addresses
-            let addrs: HashSet<SocketAddr> = ips.map(|ip| SocketAddr::new(ip, port)).collect();
-            (addrs, host_name, *p)
-        }).filter(|(a, _, _)| !a.is_empty()).collect()
+            })
+            .collect()
     }
 }

src/consumer.rs

@@ -1,99 +0,0 @@
-#[cfg(unix)]
-use std::env;
-
-use anyhow::Result;
-use crate::{backend::consumer, client::{ClientHandle, ClientEvent}, event::Event};
-
-#[cfg(unix)]
-#[derive(Debug)]
-enum Backend {
-    Wlroots,
-    X11,
-    RemoteDesktopPortal,
-    Libei,
-}
-
-pub trait EventConsumer {
-    /// Event corresponding to an abstract `client_handle`
-    fn consume(&self, event: Event, client_handle: ClientHandle);
-
-    /// Event corresponding to a configuration change
-    fn notify(&mut self, client_event: ClientEvent);
-}
-
-pub fn create() -> Result<Box<dyn EventConsumer>> {
-    #[cfg(windows)]
-    return Ok(Box::new(consumer::windows::WindowsConsumer::new()));
-
-    #[cfg(unix)]
-    let backend = match env::var("XDG_SESSION_TYPE") {
-        Ok(session_type) => match session_type.as_str() {
-            "x11" => {
-                log::info!("XDG_SESSION_TYPE = x11 -> using x11 event consumer");
-                Backend::X11
-            }
-            "wayland" => {
-                log::info!("XDG_SESSION_TYPE = wayland -> using wayland event consumer");
-                match env::var("XDG_CURRENT_DESKTOP") {
-                    Ok(current_desktop) => match current_desktop.as_str() {
-                        "gnome" => {
-                            log::info!("XDG_CURRENT_DESKTOP = gnome -> using libei backend");
-                            Backend::Libei
-                        }
-                        "KDE" => {
-                            log::info!("XDG_CURRENT_DESKTOP = KDE -> using xdg_desktop_portal backend");
-                            Backend::RemoteDesktopPortal
-                        }
-                        "sway" => {
-                            log::info!("XDG_CURRENT_DESKTOP = sway -> using wlroots backend");
-                            Backend::Wlroots
-                        }
-                        "Hyprland" => {
-                            log::info!("XDG_CURRENT_DESKTOP = Hyprland -> using wlroots backend");
-                            Backend::Wlroots
-                        }
-                        _ => {
-                            log::warn!("unknown XDG_CURRENT_DESKTOP -> defaulting to wlroots backend");
-                            Backend::Wlroots
-                        }
-                    }
-                    // default to wlroots backend for now
-                    _ => {
-                        log::warn!("unknown XDG_CURRENT_DESKTOP -> defaulting to wlroots backend");
-                        Backend::Wlroots
-                    }
-                }
-            }
-            _ => panic!("unknown XDG_SESSION_TYPE"),
-        },
-        Err(_) => panic!("could not detect session type: XDG_SESSION_TYPE environment variable not set!"),
-    };
-
-    #[cfg(unix)]
-    match backend {
-        Backend::Libei => {
-            #[cfg(not(feature = "libei"))]
-            panic!("feature libei not enabled");
-            #[cfg(feature = "libei")]
-            Ok(Box::new(consumer::libei::LibeiConsumer::new()))
-        },
-        Backend::RemoteDesktopPortal => {
-            #[cfg(not(feature = "xdg_desktop_portal"))]
-            panic!("feature xdg_desktop_portal not enabled");
-            #[cfg(feature = "xdg_desktop_portal")]
-            Ok(Box::new(consumer::xdg_desktop_portal::DesktopPortalConsumer::new()))
-        },
-        Backend::Wlroots => {
-            #[cfg(not(feature = "wayland"))]
-            panic!("feature wayland not enabled");
-            #[cfg(feature = "wayland")]
-            Ok(Box::new(consumer::wlroots::WlrootsConsumer::new()?))
-        },
-        Backend::X11 => {
-            #[cfg(not(feature = "x11"))]
-            panic!("feature x11 not enabled");
-            #[cfg(feature = "x11")]
-            Ok(Box::new(consumer::x11::X11Consumer::new()))
-        },
-    }
-}

src/dns.rs

@@ -1,9 +1,62 @@
-use std::{error::Error, net::IpAddr};
+use std::net::IpAddr;
+use tokio::sync::mpsc::Receiver;
 
-use trust_dns_resolver::Resolver;
+use hickory_resolver::{error::ResolveError, TokioAsyncResolver};
 
-pub fn resolve(host: &str) -> Result<Vec<IpAddr>, Box<dyn Error>> {
-    log::info!("resolving {host} ...");
-    let response = Resolver::from_system_conf()?.lookup_ip(host)?;
-    Ok(response.iter().collect())
+use crate::{client::ClientHandle, server::Server};
+
+pub(crate) struct DnsResolver {
+    resolver: TokioAsyncResolver,
+    dns_request: Receiver<ClientHandle>,
+}
+
+impl DnsResolver {
+    pub(crate) fn new(dns_request: Receiver<ClientHandle>) -> Result<Self, ResolveError> {
+        let resolver = TokioAsyncResolver::tokio_from_system_conf()?;
+        Ok(Self {
+            resolver,
+            dns_request,
+        })
+    }
+
+    async fn resolve(&self, host: &str) -> Result<Vec<IpAddr>, ResolveError> {
+        let response = self.resolver.lookup_ip(host).await?;
+        for ip in response.iter() {
+            log::info!("{host}: adding ip {ip}");
+        }
+        Ok(response.iter().collect())
+    }
+
+    pub(crate) async fn run(mut self, server: Server) {
+        tokio::select! {
+            _ = server.cancelled() => {},
+            _ = self.do_dns(&server) => {},
+        }
+    }
+
+    async fn do_dns(&mut self, server: &Server) {
+        loop {
+            let handle = self.dns_request.recv().await.expect("channel closed");
+
+            /* update resolving status */
+            let hostname = match server.get_hostname(handle) {
+                Some(hostname) => hostname,
+                None => continue,
+            };
+
+            log::info!("resolving ({handle}) `{hostname}` ...");
+            server.set_resolving(handle, true);
+
+            let ips = match self.resolve(&hostname).await {
+                Ok(ips) => ips,
+                Err(e) => {
+                    log::warn!("could not resolve host '{hostname}': {e}");
+                    vec![]
+                }
+            };
+
+            server.update_dns_ips(handle, ips);
+            server.set_resolving(handle, false);
+        }
+    }
 }

src/emulation_test.rs

@@ -0,0 +1,45 @@
+use crate::config::Config;
+use anyhow::Result;
+use input_event::{Event, PointerEvent};
+use std::f64::consts::PI;
+use std::time::{Duration, Instant};
+use tokio::task::LocalSet;
+
+pub fn run() -> Result<()> {
+    log::info!("running input emulation test");
+    let runtime = tokio::runtime::Builder::new_current_thread()
+        .enable_io()
+        .enable_time()
+        .build()?;
+
+    let config = Config::new()?;
+
+    runtime.block_on(LocalSet::new().run_until(input_emulation_test(config)))
+}
+
+const FREQUENCY_HZ: f64 = 1.0;
+const RADIUS: f64 = 100.0;
+
+async fn input_emulation_test(config: Config) -> Result<()> {
+    let backend = config.emulation_backend.map(|b| b.into());
+    let mut emulation = input_emulation::create(backend).await?;
+    emulation.create(0).await;
+    let start = Instant::now();
+    let mut offset = (0, 0);
+    loop {
+        tokio::time::sleep(Duration::from_millis(1)).await;
+        let elapsed = start.elapsed();
+        let elapsed_sec_f64 = elapsed.as_secs_f64();
+        let second_fraction = elapsed_sec_f64 - elapsed_sec_f64 as u64 as f64;
+        let radians = second_fraction * 2. * PI * FREQUENCY_HZ;
+        let new_offset_f = (radians.cos() * RADIUS * 2., (radians * 2.).sin() * RADIUS);
+        let new_offset = (new_offset_f.0 as i32, new_offset_f.1 as i32);
+        if new_offset != offset {
+            let relative_motion = (new_offset.0 - offset.0, new_offset.1 - offset.1);
+            offset = new_offset;
+            let (dx, dy) = (relative_motion.0 as f64, relative_motion.1 as f64);
+            let event = Event::Pointer(PointerEvent::Motion { time: 0, dx, dy });
+            emulation.consume(event, 0).await?;
+        }
+    }
+}

src/event.rs

@@ -1,471 +0,0 @@
-use std::{error::Error, fmt::{self, Display}};
-
-pub mod server;
-
-#[derive(Debug, Clone, Copy)]
-pub enum PointerEvent {
-    Motion {
-        time: u32,
-        relative_x: f64,
-        relative_y: f64,
-    },
-    Button {
-        time: u32,
-        button: u32,
-        state: u32,
-    },
-    Axis {
-        time: u32,
-        axis: u8,
-        value: f64,
-    },
-    Frame {},
-}
-
-#[derive(Debug, Clone, Copy)]
-pub enum KeyboardEvent {
-    Key {
-        time: u32,
-        key: u32,
-        state: u8,
-    },
-    Modifiers {
-        mods_depressed: u32,
-        mods_latched: u32,
-        mods_locked: u32,
-        group: u32,
-    },
-}
-
-#[derive(Debug, Clone, Copy)]
-pub enum Event {
-    Pointer(PointerEvent),
-    Keyboard(KeyboardEvent),
-    Release(),
-    Ping(),
-    Pong(),
-}
-
-impl Display for PointerEvent {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            PointerEvent::Motion { time: _ , relative_x, relative_y } => write!(f, "motion({relative_x},{relative_y})"),
-            PointerEvent::Button { time: _ , button, state } => write!(f, "button({button}, {state})"),
-            PointerEvent::Axis { time: _, axis, value } => write!(f, "scroll({axis}, {value})"),
-            PointerEvent::Frame { } => write!(f, "frame()"),
-        }
-    }
-}
-
-impl Display for KeyboardEvent {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            KeyboardEvent::Key { time: _, key, state } => write!(f, "key({key}, {state})"),
-            KeyboardEvent::Modifiers { mods_depressed, mods_latched, mods_locked, group } => write!(f, "modifiers({mods_depressed},{mods_latched},{mods_locked},{group})"),
-        }
-    }
-}
-
-impl Display for Event {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Event::Pointer(p) => write!(f, "{}", p),
-            Event::Keyboard(k) => write!(f, "{}", k),
-            Event::Release() => write!(f, "release"),
-            Event::Ping() => write!(f, "ping"),
-            Event::Pong() => write!(f, "pong"),
-        }
-    }
-}
-
-impl Event {
-    fn event_type(&self) -> EventType {
-        match self {
-            Self::Pointer(_) => EventType::POINTER,
-            Self::Keyboard(_) => EventType::KEYBOARD,
-            Self::Release() => EventType::RELEASE,
-            Self::Ping() => EventType::PING,
-            Self::Pong() => EventType::PONG,
-        }
-    }
-}
-
-impl PointerEvent {
-    fn event_type(&self) -> PointerEventType {
-        match self {
-            Self::Motion { .. } => PointerEventType::MOTION,
-            Self::Button { .. } => PointerEventType::BUTTON,
-            Self::Axis { .. } => PointerEventType::AXIS,
-            Self::Frame { .. } => PointerEventType::FRAME,
-        }
-    }
-}
-
-impl KeyboardEvent {
-    fn event_type(&self) -> KeyboardEventType {
-        match self {
-            KeyboardEvent::Key { .. } => KeyboardEventType::KEY,
-            KeyboardEvent::Modifiers { .. } => KeyboardEventType::MODIFIERS,
-        }
-    }
-}
-
-enum PointerEventType {
-    MOTION,
-    BUTTON,
-    AXIS,
-    FRAME,
-}
-enum KeyboardEventType {
-    KEY,
-    MODIFIERS,
-}
-enum EventType {
-    POINTER,
-    KEYBOARD,
-    RELEASE,
-    PING,
-    PONG,
-}
-
-impl TryFrom<u8> for PointerEventType {
-    type Error = Box<dyn Error>;
-
-    fn try_from(value: u8) -> Result<Self, Self::Error> {
-        match value {
-            x if x == Self::MOTION as u8 => Ok(Self::MOTION),
-            x if x == Self::BUTTON as u8 => Ok(Self::BUTTON),
-            x if x == Self::AXIS as u8 => Ok(Self::AXIS),
-            x if x == Self::FRAME as u8 => Ok(Self::FRAME),
-            _ => Err(Box::new(ProtocolError {
-                msg: format!("invalid pointer event type {}", value),
-            })),
-        }
-    }
-}
-
-impl TryFrom<u8> for KeyboardEventType {
-    type Error = Box<dyn Error>;
-
-    fn try_from(value: u8) -> Result<Self, Self::Error> {
-        match value {
-            x if x == Self::KEY as u8 => Ok(Self::KEY),
-            x if x == Self::MODIFIERS as u8 => Ok(Self::MODIFIERS),
-            _ => Err(Box::new(ProtocolError {
-                msg: format!("invalid keyboard event type {}", value),
-            })),
-        }
-    }
-}
-
-impl Into<Vec<u8>> for &Event {
-    fn into(self) -> Vec<u8> {
-        let event_id = vec![self.event_type() as u8];
-        let event_data = match self {
-            Event::Pointer(p) => p.into(),
-            Event::Keyboard(k) => k.into(),
-            Event::Release() => vec![],
-            Event::Ping() => vec![],
-            Event::Pong() => vec![],
-        };
-        vec![event_id, event_data].concat()
-    }
-}
-
-#[derive(Debug)]
-struct ProtocolError {
-    msg: String,
-}
-
-impl fmt::Display for ProtocolError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "Protocol violation: {}", self.msg)
-    }
-}
-impl Error for ProtocolError {}
-
-impl TryFrom<Vec<u8>> for Event {
-    type Error = Box<dyn Error>;
-
-    fn try_from(value: Vec<u8>) -> Result<Self, Self::Error> {
-        let event_id = u8::from_be_bytes(value[..1].try_into()?);
-        match event_id {
-            i if i == (EventType::POINTER as u8) => Ok(Event::Pointer(value.try_into()?)),
-            i if i == (EventType::KEYBOARD as u8) => Ok(Event::Keyboard(value.try_into()?)),
-            i if i == (EventType::RELEASE as u8) => Ok(Event::Release()),
-            i if i == (EventType::PING as u8) => Ok(Event::Ping()),
-            i if i == (EventType::PONG as u8) => Ok(Event::Pong()),
-            _ => Err(Box::new(ProtocolError {
-                msg: format!("invalid event_id {}", event_id),
-            })),
-        }
-    }
-}
-
-impl Into<Vec<u8>> for &PointerEvent {
-    fn into(self) -> Vec<u8> {
-        let id = vec![self.event_type() as u8];
-        let data = match self {
-            PointerEvent::Motion {
-                time,
-                relative_x,
-                relative_y,
-            } => {
-                let time = time.to_be_bytes();
-                let relative_x = relative_x.to_be_bytes();
-                let relative_y = relative_y.to_be_bytes();
-                vec![&time[..], &relative_x[..], &relative_y[..]].concat()
-            }
-            PointerEvent::Button {
-                time,
-                button,
-                state,
-            } => {
-                let time = time.to_be_bytes();
-                let button = button.to_be_bytes();
-                let state = state.to_be_bytes();
-                vec![&time[..], &button[..], &state[..]].concat()
-            }
-            PointerEvent::Axis { time, axis, value } => {
-                let time = time.to_be_bytes();
-                let axis = axis.to_be_bytes();
-                let value = value.to_be_bytes();
-                vec![&time[..], &axis[..], &value[..]].concat()
-            }
-            PointerEvent::Frame {} => {
-                vec![]
-            }
-        };
-        vec![id, data].concat()
-    }
-}
-
-impl TryFrom<Vec<u8>> for PointerEvent {
-    type Error = Box<dyn Error>;
-
-    fn try_from(data: Vec<u8>) -> Result<Self, Self::Error> {
-        match data.get(1) {
-            Some(id) => {
-                let event_type = match id.to_owned().try_into() {
-                    Ok(event_type) => event_type,
-                    Err(e) => return Err(e),
-                };
-                match event_type {
-                    PointerEventType::MOTION => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 2".into(),
-                                }))
-                            }
-                        };
-                        let relative_x = match data.get(6..14) {
-                            Some(d) => f64::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 8 Bytes at index 6".into(),
-                                }))
-                            }
-                        };
-                        let relative_y = match data.get(14..22) {
-                            Some(d) => f64::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 8 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        Ok(Self::Motion {
-                            time,
-                            relative_x,
-                            relative_y,
-                        })
-                    }
-                    PointerEventType::BUTTON => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 2".into(),
-                                }))
-                            }
-                        };
-                        let button = match data.get(6..10) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 10".into(),
-                                }))
-                            }
-                        };
-                        let state = match data.get(10..14) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        Ok(Self::Button {
-                            time,
-                            button,
-                            state,
-                        })
-                    }
-                    PointerEventType::AXIS => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 2".into(),
-                                }))
-                            }
-                        };
-                        let axis = match data.get(6) {
-                            Some(d) => *d,
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 1 Byte at index 6".into(),
-                                }));
-                            }
-                        };
-                        let value = match data.get(7..15) {
-                            Some(d) => f64::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 8 Bytes at index 7".into(),
-                                }));
-                            }
-                        };
-                        Ok(Self::Axis { time, axis, value })
-                    }
-                    PointerEventType::FRAME => Ok(Self::Frame {}),
-                }
-            }
-            None => Err(Box::new(ProtocolError {
-                msg: "Expected an element at index 0".into(),
-            })),
-        }
-    }
-}
-
-impl Into<Vec<u8>> for &KeyboardEvent {
-    fn into(self) -> Vec<u8> {
-        let id = vec![self.event_type() as u8];
-        let data = match self {
-            KeyboardEvent::Key { time, key, state } => {
-                let time = time.to_be_bytes();
-                let key = key.to_be_bytes();
-                let state = state.to_be_bytes();
-                vec![&time[..], &key[..], &state[..]].concat()
-            }
-            KeyboardEvent::Modifiers {
-                mods_depressed,
-                mods_latched,
-                mods_locked,
-                group,
-            } => {
-                let mods_depressed = mods_depressed.to_be_bytes();
-                let mods_latched = mods_latched.to_be_bytes();
-                let mods_locked = mods_locked.to_be_bytes();
-                let group = group.to_be_bytes();
-                vec![
-                    &mods_depressed[..],
-                    &mods_latched[..],
-                    &mods_locked[..],
-                    &group[..],
-                ]
-                .concat()
-            }
-        };
-        vec![id, data].concat()
-    }
-}
-
-impl TryFrom<Vec<u8>> for KeyboardEvent {
-    type Error = Box<dyn Error>;
-
-    fn try_from(data: Vec<u8>) -> Result<Self, Self::Error> {
-        match data.get(1) {
-            Some(id) => {
-                let event_type = match id.to_owned().try_into() {
-                    Ok(event_type) => event_type,
-                    Err(e) => return Err(e),
-                };
-                match event_type {
-                    KeyboardEventType::KEY => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 6".into(),
-                                }))
-                            }
-                        };
-                        let key = match data.get(6..10) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 10".into(),
-                                }))
-                            }
-                        };
-                        let state = match data.get(10) {
-                            Some(d) => *d,
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 1 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        Ok(KeyboardEvent::Key { time, key, state })
-                    }
-                    KeyboardEventType::MODIFIERS => {
-                        let mods_depressed = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 6".into(),
-                                }))
-                            }
-                        };
-                        let mods_latched = match data.get(6..10) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 10".into(),
-                                }))
-                            }
-                        };
-                        let mods_locked = match data.get(10..14) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        let group = match data.get(14..18) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(Box::new(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 18".into(),
-                                }))
-                            }
-                        };
-                        Ok(KeyboardEvent::Modifiers {
-                            mods_depressed,
-                            mods_latched,
-                            mods_locked,
-                            group,
-                        })
-                    }
-                }
-            }
-            None => Err(Box::new(ProtocolError {
-                msg: "Expected an element at index 0".into(),
-            })),
-        }
-    }
-}

src/event/server.rs

@@ -1,282 +0,0 @@
-use std::{error::Error, io::Result, collections::HashSet, time::Duration};
-use log;
-use mio::{Events, Poll, Interest, Token, net::UdpSocket};
-#[cfg(not(windows))]
-use mio_signals::{Signals, Signal, SignalSet};
-
-use std::{net::SocketAddr, io::ErrorKind};
-
-use crate::{client::{ClientEvent, ClientManager, Position}, consumer::EventConsumer, producer::EventProducer, frontend::{FrontendEvent, FrontendAdapter}};
-use super::Event;
-
-/// keeps track of state to prevent a feedback loop
-/// of continuously sending and receiving the same event.
-#[derive(Eq, PartialEq)]
-enum State {
-    Sending,
-    Receiving,
-}
-
-pub struct Server {
-    poll: Poll,
-    socket: UdpSocket,
-    producer: Box<dyn EventProducer>,
-    consumer: Box<dyn EventConsumer>,
-    #[cfg(not(windows))]
-    signals: Signals,
-    frontend: FrontendAdapter,
-    client_manager: ClientManager,
-    state: State,
-}
-
-const UDP_RX: Token = Token(0);
-const FRONTEND_RX: Token = Token(1);
-const PRODUCER_RX: Token = Token(2);
-#[cfg(not(windows))]
-const SIGNAL: Token = Token(3);
-
-impl Server {
-    pub fn new(
-        port: u16,
-        mut producer: Box<dyn EventProducer>,
-        consumer: Box<dyn EventConsumer>,
-        mut frontend: FrontendAdapter,
-    ) -> Result<Self> {
-        // bind the udp socket
-        let listen_addr = SocketAddr::new("0.0.0.0".parse().unwrap(), port);
-        let mut socket = UdpSocket::bind(listen_addr)?;
-
-        // register event sources
-        let poll = Poll::new()?;
-
-        // hand signal handling over to the event loop
-        #[cfg(not(windows))]
-        let mut signals = Signals::new(SignalSet::all())?;
-
-        #[cfg(not(windows))]
-        poll.registry().register(&mut signals, SIGNAL, Interest::READABLE)?;
-        poll.registry().register(&mut socket, UDP_RX, Interest::READABLE | Interest::WRITABLE)?;
-        poll.registry().register(&mut producer, PRODUCER_RX, Interest::READABLE)?;
-        poll.registry().register(&mut frontend, FRONTEND_RX, Interest::READABLE)?;
-
-        // create client manager
-        let client_manager = ClientManager::new();
-        Ok(Server {
-            poll, socket, consumer, producer,
-            #[cfg(not(windows))]
-            signals, frontend,
-            client_manager,
-            state: State::Receiving,
-        })
-    }
-
-    pub fn run(&mut self) -> Result<()> {
-        let mut events = Events::with_capacity(10);
-        loop {
-            match self.poll.poll(&mut events, None) {
-                Ok(()) => (),
-                Err(e) if e.kind() == ErrorKind::Interrupted => continue,
-                Err(e) => return Err(e),
-            }
-            for event in &events {
-                if !event.is_readable() { continue }
-                match event.token() {
-                    UDP_RX => self.handle_udp_rx(),
-                    PRODUCER_RX => self.handle_producer_rx(),
-                    FRONTEND_RX => if self.handle_frontend_rx() { return Ok(()) },
-                    #[cfg(not(windows))]
-                    SIGNAL => if self.handle_signal() { return Ok(()) },
-                    _ => panic!("what happened here?")
-                }
-            }
-        }
-    }
-
-    pub fn add_client(&mut self, addr: HashSet<SocketAddr>, pos: Position) {
-        let client = self.client_manager.add_client(addr, pos);
-        self.producer.notify(ClientEvent::Create(client, pos));
-        self.consumer.notify(ClientEvent::Create(client, pos));
-    }
-
-    fn handle_udp_rx(&mut self) {
-        loop {
-            let (event, addr) = match self.receive_event() {
-                Ok(e) => e,
-                Err(e) => {
-                    if e.is::<std::io::Error>() {
-                        if let ErrorKind::WouldBlock = e.downcast_ref::<std::io::Error>()
-                            .unwrap()
-                            .kind() {
-                            return
-                        }
-                    }
-                    log::error!("{}", e);
-                    continue
-                }
-            };
-            log::trace!("{:20} <-<-<-<------ {addr}", event.to_string());
-
-            // get handle for addr
-            let handle = match self.client_manager.get_client(addr) {
-                Some(a) => a,
-                None => {
-                    log::warn!("ignoring event from client {addr:?}");
-                    continue
-                }
-            };
-
-            // reset ttl for client and set addr as new default for this client
-            self.client_manager.reset_last_seen(handle);
-            self.client_manager.set_default_addr(handle, addr);
-            match (event, addr) {
-                (Event::Pong(), _) => {},
-                (Event::Ping(), addr) => {
-                    if let Err(e) = Self::send_event(&self.socket, Event::Pong(), addr) {
-                        log::error!("udp send: {}", e);
-                    }
-                }
-                (event, addr) => {
-                    match self.state {
-                        State::Sending => {
-                            // in sending state, we dont want to process
-                            // any events to avoid feedback loops,
-                            // therefore we tell the event producer
-                            // to release the pointer and move on
-                            // first event -> release pointer
-                            if let Event::Release() = event {
-                                log::debug!("releasing pointer ...");
-                                self.producer.release();
-                                self.state = State::Receiving;
-                            }
-                        }
-                        State::Receiving => {
-                            // consume event
-                            self.consumer.consume(event, handle);
-
-                            // let the server know we are still alive once every second
-                            let last_replied = self.client_manager.last_replied(handle);
-                            if  last_replied.is_none() 
-                            || last_replied.is_some() && last_replied.unwrap() > Duration::from_secs(1) {
-                                self.client_manager.reset_last_replied(handle);
-                                if let Err(e) = Self::send_event(&self.socket, Event::Pong(), addr) {
-                                    log::error!("udp send: {}", e);
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    fn handle_producer_rx(&mut self) {
-        let events = self.producer.read_events();
-        for (c, e) in events.into_iter() {
-            // in receiving state, only release events
-            // must be transmitted
-            if let Event::Release() = e {
-                self.state = State::Sending;
-            }
-            // otherwise we should have an address to send to
-            // transmit events to the corrensponding client
-            if let Some(addr) = self.client_manager.get_active_addr(c) {
-                log::trace!("{:20} ------>->->-> {addr}", e.to_string());
-                if let Err(e) = Self::send_event(&self.socket, e, addr) {
-                    log::error!("udp send: {}", e);
-                }
-            }
-
-            // if client last responded > 2 seconds ago
-            // and we have not sent a ping since 500 milliseconds,
-            // send a ping
-            let last_seen = self.client_manager.last_seen(c);
-            let last_ping = self.client_manager.last_ping(c);
-            if last_seen.is_some() && last_seen.unwrap() < Duration::from_secs(2) {
-                continue
-            }
-
-            // client last seen > 500ms ago
-            if last_ping.is_some() && last_ping.unwrap() < Duration::from_millis(500) {
-                continue
-            }
-
-            // last ping > 500ms ago -> ping all interfaces
-            self.client_manager.reset_last_ping(c);
-            if let Some(iter) = self.client_manager.get_addrs(c) {
-                for addr in iter {
-                    log::debug!("pinging {addr}");
-                    if let Err(e) = Self::send_event(&self.socket, Event::Ping(), addr) {
-                        if e.kind() != ErrorKind::WouldBlock {
-                            log::error!("udp send: {}", e);
-                        }
-                    }
-                }
-            } else {
-                // TODO should repeat dns lookup
-            }
-        }
-    }
-
-    fn handle_frontend_rx(&mut self) -> bool {
-        loop {
-            match self.frontend.read_event() {
-                Ok(event) => match event {
-                    FrontendEvent::RequestPortChange(_) => todo!(),
-                    FrontendEvent::RequestClientAdd(addr, pos) => {
-                        self.add_client(HashSet::from_iter(&mut [addr].into_iter()), pos);
-                    }
-                    FrontendEvent::RequestClientDelete(_) => todo!(),
-                    FrontendEvent::RequestClientUpdate(_) => todo!(),
-                    FrontendEvent::RequestShutdown() => {
-                        log::info!("terminating gracefully...");
-                        return true;
-                    },
-                }
-                Err(e) if e.kind() == ErrorKind::WouldBlock => return false,
-                Err(e) => {
-                    log::error!("frontend: {e}");
-                }
-            }
-        }
-    }
-
-    #[cfg(not(windows))]
-    fn handle_signal(&mut self) -> bool {
-        #[cfg(windows)]
-        return false;
-        #[cfg(not(windows))]
-        loop {
-            match self.signals.receive() {
-                Err(e) if e.kind() == ErrorKind::WouldBlock => return false,
-                Err(e) => {
-                    log::error!("error reading signal: {e}");
-                    return false;
-                }
-                Ok(Some(Signal::Interrupt) | Some(Signal::Terminate)) => {
-                    // terminate on SIG_INT or SIG_TERM
-                    log::info!("terminating gracefully...");
-                    return true;
-                },
-                Ok(Some(signal)) => {
-                    log::info!("ignoring signal {signal:?}");
-                },
-                Ok(None) => return false,
-            }
-        }
-    }
-
-    fn send_event(sock: &UdpSocket, e: Event, addr: SocketAddr) -> Result<usize> {
-        let data: Vec<u8> = (&e).into();
-        // We are currently abusing a blocking send to get the lowest possible latency.
-        // It may be better to set the socket to non-blocking and only send when ready.
-        sock.send_to(&data[..], addr)
-    }
-
-    fn receive_event(&self) -> std::result::Result<(Event, SocketAddr), Box<dyn Error>> {
-        let mut buf = vec![0u8; 22];
-        match self.socket.recv_from(&mut buf) {
-            Ok((_amt, src)) => Ok((Event::try_from(buf)?, src)),
-            Err(e) => Err(Box::new(e)),
-        }
-    }
-}

src/frontend.rs

@@ -1,115 +1,307 @@
-use std::io::{Read, Result};
-use std::{str, net::SocketAddr};
+use anyhow::{anyhow, Result};
+use std::{cmp::min, io::ErrorKind, net::IpAddr, str, time::Duration};
 
 #[cfg(unix)]
-use std::{env, path::{Path, PathBuf}};
+use std::{
+    env,
+    path::{Path, PathBuf},
+};
 
-use mio::{Registry, Token, event::Source};
+use tokio::io::ReadHalf;
+use tokio::io::{AsyncReadExt, AsyncWriteExt, WriteHalf};
 
 #[cfg(unix)]
-use mio::net::UnixListener;
+use tokio::net::UnixListener;
+#[cfg(unix)]
+use tokio::net::UnixStream;
+
 #[cfg(windows)]
-use mio::net::TcpListener;
+use tokio::net::TcpListener;
+#[cfg(windows)]
+use tokio::net::TcpStream;
 
-use serde::{Serialize, Deserialize};
+use serde::{Deserialize, Serialize};
 
-use crate::client::{Client, Position};
+use crate::{
+    client::{ClientConfig, ClientHandle, ClientState, Position},
+    config::{Config, Frontend},
+};
 
 /// cli frontend
 pub mod cli;
 
 /// gtk frontend
-#[cfg(all(unix, feature = "gtk"))]
+#[cfg(feature = "gtk")]
 pub mod gtk;
 
+pub fn run_frontend(config: &Config) -> Result<()> {
+    match config.frontend {
+        #[cfg(feature = "gtk")]
+        Frontend::Gtk => {
+            gtk::run();
+        }
+        #[cfg(not(feature = "gtk"))]
+        Frontend::Gtk => panic!("gtk frontend requested but feature not enabled!"),
+        Frontend::Cli => {
+            cli::run()?;
+        }
+    };
+    Ok(())
+}
+
+fn exponential_back_off(duration: &mut Duration) -> &Duration {
+    let new = duration.saturating_mul(2);
+    *duration = min(new, Duration::from_secs(1));
+    duration
+}
+
+/// wait for the lan-mouse socket to come online
+#[cfg(unix)]
+pub fn wait_for_service() -> Result<std::os::unix::net::UnixStream> {
+    let socket_path = FrontendListener::socket_path()?;
+    let mut duration = Duration::from_millis(1);
+    loop {
+        use std::os::unix::net::UnixStream;
+        if let Ok(stream) = UnixStream::connect(&socket_path) {
+            break Ok(stream);
+        }
+        // a signaling mechanism or inotify could be used to
+        // improve this
+        std::thread::sleep(*exponential_back_off(&mut duration));
+    }
+}
+
+#[cfg(windows)]
+pub fn wait_for_service() -> Result<std::net::TcpStream> {
+    let mut duration = Duration::from_millis(1);
+    loop {
+        use std::net::TcpStream;
+        if let Ok(stream) = TcpStream::connect("127.0.0.1:5252") {
+            break Ok(stream);
+        }
+        std::thread::sleep(*exponential_back_off(&mut duration));
+    }
+}
+
 #[derive(Debug, Eq, PartialEq, Clone, Serialize, Deserialize)]
-pub enum FrontendEvent {
-    RequestPortChange(u16),
-    RequestClientAdd(SocketAddr, Position),
-    RequestClientDelete(Client),
-    RequestClientUpdate(Client),
-    RequestShutdown(),
+pub enum FrontendRequest {
+    /// activate/deactivate client
+    Activate(ClientHandle, bool),
+    /// add a new client
+    Create,
+    /// change the listen port (recreate udp listener)
+    ChangePort(u16),
+    /// remove a client
+    Delete(ClientHandle),
+    /// request an enumeration of all clients
+    Enumerate(),
+    /// resolve dns
+    ResolveDns(ClientHandle),
+    /// update hostname
+    UpdateHostname(ClientHandle, Option<String>),
+    /// update port
+    UpdatePort(ClientHandle, u16),
+    /// update position
+    UpdatePosition(ClientHandle, Position),
+    /// update fix-ips
+    UpdateFixIps(ClientHandle, Vec<IpAddr>),
+    /// request the state of the given client
+    GetState(ClientHandle),
+    /// request reenabling input capture
+    EnableCapture,
+    /// request reenabling input emulation
+    EnableEmulation,
+}
+
+#[derive(Clone, Copy, Debug, Default, Serialize, Deserialize)]
+pub enum Status {
+    #[default]
+    Disabled,
+    Enabled,
+}
+
+impl From<Status> for bool {
+    fn from(status: Status) -> Self {
+        match status {
+            Status::Enabled => true,
+            Status::Disabled => false,
+        }
+    }
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
-pub enum FrontendNotify {
-    NotifyClientCreate(Client),
-    NotifyError(String),
+pub enum FrontendEvent {
+    /// a client was created
+    Created(ClientHandle, ClientConfig, ClientState),
+    /// no such client
+    NoSuchClient(ClientHandle),
+    /// state changed
+    State(ClientHandle, ClientConfig, ClientState),
+    /// the client was deleted
+    Deleted(ClientHandle),
+    /// new port, reason of failure (if failed)
+    PortChanged(u16, Option<String>),
+    /// list of all clients, used for initial state synchronization
+    Enumerate(Vec<(ClientHandle, ClientConfig, ClientState)>),
+    /// an error occured
+    Error(String),
+    /// capture status
+    CaptureStatus(Status),
+    /// emulation status
+    EmulationStatus(Status),
 }
 
-pub struct FrontendAdapter {
+pub struct FrontendListener {
     #[cfg(windows)]
     listener: TcpListener,
     #[cfg(unix)]
     listener: UnixListener,
     #[cfg(unix)]
     socket_path: PathBuf,
+    #[cfg(unix)]
+    tx_streams: Vec<WriteHalf<UnixStream>>,
+    #[cfg(windows)]
+    tx_streams: Vec<WriteHalf<TcpStream>>,
 }
 
-impl FrontendAdapter {
-    pub fn new() -> std::result::Result<Self, Box<dyn std::error::Error>> {
+impl FrontendListener {
+    #[cfg(all(unix, not(target_os = "macos")))]
+    pub fn socket_path() -> Result<PathBuf> {
+        let xdg_runtime_dir = match env::var("XDG_RUNTIME_DIR") {
+            Ok(d) => d,
+            Err(e) => return Err(anyhow!("could not find XDG_RUNTIME_DIR: {e}")),
+        };
+        let xdg_runtime_dir = Path::new(xdg_runtime_dir.as_str());
+        Ok(xdg_runtime_dir.join("lan-mouse-socket.sock"))
+    }
+
+    #[cfg(all(unix, target_os = "macos"))]
+    pub fn socket_path() -> Result<PathBuf> {
+        let home = match env::var("HOME") {
+            Ok(d) => d,
+            Err(e) => return Err(anyhow!("could not find HOME: {e}")),
+        };
+        let home = Path::new(home.as_str());
+        let path = home
+            .join("Library")
+            .join("Caches")
+            .join("lan-mouse-socket.sock");
+        Ok(path)
+    }
+
+    pub async fn new() -> Option<Result<Self>> {
         #[cfg(unix)]
-        let socket_path = Path::new(env::var("XDG_RUNTIME_DIR")?.as_str()).join("lan-mouse-socket.sock");
-        #[cfg(unix)]
-        let listener = UnixListener::bind(&socket_path)?;
+        let (socket_path, listener) = {
+            let socket_path = match Self::socket_path() {
+                Ok(path) => path,
+                Err(e) => return Some(Err(e)),
+            };
+
+            log::debug!("remove socket: {:?}", socket_path);
+            if socket_path.exists() {
+                // try to connect to see if some other instance
+                // of lan-mouse is already running
+                match UnixStream::connect(&socket_path).await {
+                    // connected -> lan-mouse is already running
+                    Ok(_) => return None,
+                    // lan-mouse is not running but a socket was left behind
+                    Err(e) => {
+                        log::debug!("{socket_path:?}: {e} - removing left behind socket");
+                        let _ = std::fs::remove_file(&socket_path);
+                    }
+                }
+            }
+            let listener = match UnixListener::bind(&socket_path) {
+                Ok(ls) => ls,
+                // some other lan-mouse instance has bound the socket in the meantime
+                Err(e) if e.kind() == ErrorKind::AddrInUse => return None,
+                Err(e) => return Some(Err(anyhow!("failed to bind lan-mouse-socket: {e}"))),
+            };
+            (socket_path, listener)
+        };
 
         #[cfg(windows)]
-        let listener = TcpListener::bind("127.0.0.1:5252".parse().unwrap())?; // abuse tcp
+        let listener = match TcpListener::bind("127.0.0.1:5252").await {
+            Ok(ls) => ls,
+            // some other lan-mouse instance has bound the socket in the meantime
+            Err(e) if e.kind() == ErrorKind::AddrInUse => return None,
+            Err(e) => return Some(Err(anyhow!("failed to bind lan-mouse-socket: {e}"))),
+        };
 
         let adapter = Self {
             listener,
             #[cfg(unix)]
             socket_path,
+            tx_streams: vec![],
         };
 
-        Ok(adapter)
+        Some(Ok(adapter))
     }
 
-    pub fn read_event(&mut self) -> Result<FrontendEvent>{
-        let (mut stream, _) = self.listener.accept()?;
-        let mut buf = [0u8; 128]; // FIXME
-        stream.read(&mut buf)?;
-        let json = str::from_utf8(&buf)
-            .unwrap()
-            .trim_end_matches(char::from(0)); // remove trailing 0-bytes
-        let event = serde_json::from_str(json).unwrap();
-        log::debug!("{:?}", event);
-        Ok(event)
+    #[cfg(unix)]
+    pub async fn accept(&mut self) -> Result<ReadHalf<UnixStream>> {
+        let stream = self.listener.accept().await?.0;
+        let (rx, tx) = tokio::io::split(stream);
+        self.tx_streams.push(tx);
+        Ok(rx)
     }
 
-    pub fn notify(&self, _event: FrontendNotify) { }
-}
-
-impl Source for FrontendAdapter {
-    fn register(
-        &mut self,
-        registry: &Registry,
-        token: Token,
-        interests: mio::Interest,
-    ) -> Result<()> {
-        self.listener.register(registry, token, interests)
+    #[cfg(windows)]
+    pub async fn accept(&mut self) -> Result<ReadHalf<TcpStream>> {
+        let stream = self.listener.accept().await?.0;
+        let (rx, tx) = tokio::io::split(stream);
+        self.tx_streams.push(tx);
+        Ok(rx)
     }
 
-    fn reregister(
-        &mut self,
-        registry: &Registry,
-        token: Token,
-        interests: mio::Interest,
-    ) -> Result<()> {
-        self.listener.reregister(registry, token, interests)
-    }
+    pub(crate) async fn broadcast(&mut self, notify: FrontendEvent) {
+        // encode event
+        let json = serde_json::to_string(&notify).unwrap();
+        let payload = json.as_bytes();
+        let len = payload.len().to_be_bytes();
+        log::debug!("broadcasting event to streams: {json}");
+        let mut keep = vec![];
+        // TODO do simultaneously
+        for tx in self.tx_streams.iter_mut() {
+            // write len + payload
+            if tx.write(&len).await.is_err() {
+                keep.push(false);
+                continue;
+            }
+            if tx.write(payload).await.is_err() {
+                keep.push(false);
+                continue;
+            }
+            keep.push(true);
+        }
 
-    fn deregister(&mut self, registry: &Registry) -> Result<()> {
-        self.listener.deregister(registry)
+        // could not find a better solution because async
+        let mut keep = keep.into_iter();
+        self.tx_streams.retain(|_| keep.next().unwrap());
     }
 }
 
 #[cfg(unix)]
-impl Drop for FrontendAdapter {
+impl Drop for FrontendListener {
     fn drop(&mut self) {
         log::debug!("remove socket: {:?}", self.socket_path);
-        std::fs::remove_file(&self.socket_path).unwrap();
+        let _ = std::fs::remove_file(&self.socket_path);
     }
 }
 
-pub trait Frontend { }
+#[cfg(unix)]
+pub async fn wait_for_request(stream: &mut ReadHalf<UnixStream>) -> Result<FrontendRequest> {
+    let len = stream.read_u64().await?;
+    assert!(len <= 256);
+    let mut buf = [0u8; 256];
+    stream.read_exact(&mut buf[..len as usize]).await?;
+    Ok(serde_json::from_slice(&buf[..len as usize])?)
+}
+
+#[cfg(windows)]
+pub async fn wait_for_request(stream: &mut ReadHalf<TcpStream>) -> Result<FrontendRequest> {
+    let len = stream.read_u64().await?;
+    let mut buf = [0u8; 256];
+    stream.read_exact(&mut buf[..len as usize]).await?;
+    Ok(serde_json::from_slice(&buf[..len as usize])?)
+}

src/frontend/cli.rs

@@ -1,85 +1,331 @@
-use anyhow::Result;
-use std::{thread, io::Write, net::SocketAddr};
-#[cfg(windows)]
-use std::net::SocketAddrV4;
+use anyhow::{anyhow, Result};
+use tokio::{
+    io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader},
+    task::LocalSet,
+};
 
+#[cfg(windows)]
+use tokio::net::tcp::{ReadHalf, WriteHalf};
 #[cfg(unix)]
-use std::{os::unix::net::UnixStream, path::Path, env};
-#[cfg(windows)]
-use std::net::TcpStream;
+use tokio::net::unix::{ReadHalf, WriteHalf};
 
-use crate::client::Position;
+use std::io::{self, Write};
 
-use super::{FrontendEvent, Frontend};
+use crate::{
+    client::{ClientConfig, ClientHandle, ClientState},
+    config::DEFAULT_PORT,
+};
 
-pub struct CliFrontend;
+use self::command::{Command, CommandType};
 
-impl Frontend for CliFrontend {}
+use super::{FrontendEvent, FrontendRequest};
 
-impl CliFrontend {
-    pub fn new() -> Result<CliFrontend> {
+mod command;
+
+pub fn run() -> Result<()> {
+    let Ok(stream) = super::wait_for_service() else {
+        return Err(anyhow!("Could not connect to lan-mouse-socket"));
+    };
+
+    let runtime = tokio::runtime::Builder::new_current_thread()
+        .enable_io()
+        .enable_time()
+        .build()?;
+    runtime.block_on(LocalSet::new().run_until(async move {
+        stream.set_nonblocking(true)?;
         #[cfg(unix)]
-        let socket_path = Path::new(env::var("XDG_RUNTIME_DIR")?.as_str()).join("lan-mouse-socket.sock");
-        thread::Builder::new()
-            .name("cli-frontend".to_string())
-            .spawn(move || {
-            loop {
-                eprint!("lan-mouse > ");
-                std::io::stderr().flush().unwrap();
-                let mut buf = String::new();
-                match std::io::stdin().read_line(&mut buf) {
-                    Ok(len) => {
-                        if let Some(event) = parse_event(buf, len) {
-                            #[cfg(unix)]
-                            let Ok(mut stream) = UnixStream::connect(&socket_path) else {
-                                log::error!("Could not connect to lan-mouse-socket");
-                                continue;
-                            };
-                            #[cfg(windows)]
-                            let Ok(mut stream) = TcpStream::connect("127.0.0.1:5252".parse::<SocketAddrV4>().unwrap()) else {
-                                log::error!("Could not connect to lan-mouse-server");
-                                continue;
-                            };
-                            let json = serde_json::to_string(&event).unwrap();
-                            if let Err(e) = stream.write(json.as_bytes()) {
-                                log::error!("error sending message: {e}");
-                            };
-                            if event == FrontendEvent::RequestShutdown() {
-                                break;
-                            }
+        let mut stream = tokio::net::UnixStream::from_std(stream)?;
+        #[cfg(windows)]
+        let mut stream = tokio::net::TcpStream::from_std(stream)?;
+        let (rx, tx) = stream.split();
+
+        let mut cli = Cli::new(rx, tx);
+        cli.run().await
+    }))?;
+    Ok(())
+}
+
+struct Cli<'a> {
+    clients: Vec<(ClientHandle, ClientConfig, ClientState)>,
+    rx: ReadHalf<'a>,
+    tx: WriteHalf<'a>,
+}
+
+impl<'a> Cli<'a> {
+    fn new(rx: ReadHalf<'a>, tx: WriteHalf<'a>) -> Cli<'a> {
+        Self {
+            clients: vec![],
+            rx,
+            tx,
+        }
+    }
+
+    async fn run(&mut self) -> Result<()> {
+        let stdin = tokio::io::stdin();
+        let stdin = BufReader::new(stdin);
+        let mut stdin = stdin.lines();
+
+        /* initial state sync */
+        let request = FrontendRequest::Enumerate();
+        self.send_request(request).await?;
+
+        self.clients = loop {
+            let event = self.await_event().await?;
+            if let FrontendEvent::Enumerate(clients) = event {
+                break clients;
+            }
+        };
+
+        loop {
+            prompt()?;
+            tokio::select! {
+                line = stdin.next_line() => {
+                    let Some(line) = line? else {
+                        break Ok(());
+                    };
+                    let cmd: Command = match line.parse() {
+                        Ok(cmd) => cmd,
+                        Err(e) => {
+                            eprintln!("{e}");
+                            continue;
+                        }
+                    };
+                    self.execute(cmd).await?;
+                }
+                event = self.await_event() => {
+                    let event = event?;
+                    self.handle_event(event);
+                }
+            }
+        }
+    }
+
+    async fn update_client(&mut self, handle: ClientHandle) -> Result<()> {
+        self.send_request(FrontendRequest::GetState(handle)).await?;
+        loop {
+            let event = self.await_event().await?;
+            self.handle_event(event.clone());
+            if let FrontendEvent::State(_, _, _) | FrontendEvent::NoSuchClient(_) = event {
+                break;
+            }
+        }
+        Ok(())
+    }
+
+    async fn execute(&mut self, cmd: Command) -> Result<()> {
+        match cmd {
+            Command::None => {}
+            Command::Connect(pos, host, port) => {
+                let request = FrontendRequest::Create;
+                self.send_request(request).await?;
+                let handle = loop {
+                    let event = self.await_event().await?;
+                    match event {
+                        FrontendEvent::Created(h, c, s) => {
+                            self.clients.push((h, c, s));
+                            break h;
+                        }
+                        _ => {
+                            self.handle_event(event);
+                            continue;
                         }
                     }
-                    Err(e) => {
-                        log::error!("{e:?}");
-                        break
+                };
+                for request in [
+                    FrontendRequest::UpdateHostname(handle, Some(host.clone())),
+                    FrontendRequest::UpdatePort(handle, port.unwrap_or(DEFAULT_PORT)),
+                    FrontendRequest::UpdatePosition(handle, pos),
+                ] {
+                    self.send_request(request).await?;
+                }
+                self.update_client(handle).await?;
+            }
+            Command::Disconnect(id) => {
+                self.send_request(FrontendRequest::Delete(id)).await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::Deleted(_) = event {
+                        self.handle_event(event);
+                        break;
                     }
                 }
             }
-        }).unwrap();
-        Ok(Self {})
+            Command::Activate(id) => {
+                self.send_request(FrontendRequest::Activate(id, true))
+                    .await?;
+                self.update_client(id).await?;
+            }
+            Command::Deactivate(id) => {
+                self.send_request(FrontendRequest::Activate(id, false))
+                    .await?;
+                self.update_client(id).await?;
+            }
+            Command::List => {
+                self.send_request(FrontendRequest::Enumerate()).await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::Enumerate(_) = event {
+                        break;
+                    }
+                }
+            }
+            Command::SetHost(handle, host) => {
+                let request = FrontendRequest::UpdateHostname(handle, Some(host.clone()));
+                self.send_request(request).await?;
+                self.update_client(handle).await?;
+            }
+            Command::SetPort(handle, port) => {
+                let request = FrontendRequest::UpdatePort(handle, port.unwrap_or(DEFAULT_PORT));
+                self.send_request(request).await?;
+                self.update_client(handle).await?;
+            }
+            Command::Help => {
+                for cmd_type in [
+                    CommandType::List,
+                    CommandType::Connect,
+                    CommandType::Disconnect,
+                    CommandType::Activate,
+                    CommandType::Deactivate,
+                    CommandType::SetHost,
+                    CommandType::SetPort,
+                ] {
+                    eprintln!("{}", cmd_type.usage());
+                }
+            }
+        }
+        Ok(())
+    }
+
+    fn find_mut(
+        &mut self,
+        handle: ClientHandle,
+    ) -> Option<&mut (ClientHandle, ClientConfig, ClientState)> {
+        self.clients.iter_mut().find(|(h, _, _)| *h == handle)
+    }
+
+    fn remove(
+        &mut self,
+        handle: ClientHandle,
+    ) -> Option<(ClientHandle, ClientConfig, ClientState)> {
+        let idx = self.clients.iter().position(|(h, _, _)| *h == handle);
+        idx.map(|i| self.clients.swap_remove(i))
+    }
+
+    fn handle_event(&mut self, event: FrontendEvent) {
+        match event {
+            FrontendEvent::Created(h, c, s) => {
+                eprint!("client added ({h}): ");
+                print_config(&c);
+                eprint!(" ");
+                print_state(&s);
+                eprintln!();
+                self.clients.push((h, c, s));
+            }
+            FrontendEvent::NoSuchClient(h) => {
+                eprintln!("no such client: {h}");
+            }
+            FrontendEvent::State(h, c, s) => {
+                if let Some((_, config, state)) = self.find_mut(h) {
+                    let old_host = config.hostname.clone().unwrap_or("\"\"".into());
+                    let new_host = c.hostname.clone().unwrap_or("\"\"".into());
+                    if old_host != new_host {
+                        eprintln!(
+                            "client {h}: hostname updated ({} -> {})",
+                            old_host, new_host
+                        );
+                    }
+                    if config.port != c.port {
+                        eprintln!("client {h} changed port: {} -> {}", config.port, c.port);
+                    }
+                    if config.fix_ips != c.fix_ips {
+                        eprintln!("client {h} ips updated: {:?}", c.fix_ips)
+                    }
+                    *config = c;
+                    if state.active ^ s.active {
+                        eprintln!(
+                            "client {h} {}",
+                            if s.active { "activated" } else { "deactivated" }
+                        );
+                    }
+                    *state = s;
+                }
+            }
+            FrontendEvent::Deleted(h) => {
+                if let Some((h, c, _)) = self.remove(h) {
+                    eprint!("client {h} removed (");
+                    print_config(&c);
+                    eprintln!(")");
+                }
+            }
+            FrontendEvent::PortChanged(p, e) => {
+                if let Some(e) = e {
+                    eprintln!("failed to change port: {e}");
+                } else {
+                    eprintln!("changed port to {p}");
+                }
+            }
+            FrontendEvent::Enumerate(clients) => {
+                self.clients = clients;
+                self.print_clients();
+            }
+            FrontendEvent::Error(e) => {
+                eprintln!("ERROR: {e}");
+            }
+            FrontendEvent::CaptureStatus(s) => {
+                eprintln!("capture status: {s:?}")
+            }
+            FrontendEvent::EmulationStatus(s) => {
+                eprintln!("emulation status: {s:?}")
+            }
+        }
+    }
+
+    fn print_clients(&mut self) {
+        for (h, c, s) in self.clients.iter() {
+            eprint!("client {h}: ");
+            print_config(c);
+            eprint!(" ");
+            print_state(s);
+            eprintln!();
+        }
+    }
+
+    async fn send_request(&mut self, request: FrontendRequest) -> io::Result<()> {
+        let json = serde_json::to_string(&request).unwrap();
+        let bytes = json.as_bytes();
+        let len = bytes.len();
+        self.tx.write_u64(len as u64).await?;
+        self.tx.write_all(bytes).await?;
+        Ok(())
+    }
+
+    async fn await_event(&mut self) -> Result<FrontendEvent> {
+        let len = self.rx.read_u64().await?;
+        let mut buf = vec![0u8; len as usize];
+        self.rx.read_exact(&mut buf).await?;
+        let event: FrontendEvent = serde_json::from_slice(&buf)?;
+        Ok(event)
     }
 }
 
-fn parse_event(s: String, len: usize) -> Option<FrontendEvent> {
-    if len == 0 {
-        return Some(FrontendEvent::RequestShutdown())
-    }
-    let mut l = s.split_whitespace();
-    let cmd = l.next()?;
-    match cmd {
-        "connect" => {
-            let addr = match l.next()?.parse() {
-                Ok(addr) => SocketAddr::V4(addr),
-                Err(e) => {
-                    log::error!("parse error: {e}");
-                    return None;
-                }
-            };
-            Some(FrontendEvent::RequestClientAdd(addr, Position::Left ))
-        }
-        _ => {
-            log::error!("unknown command: {s}");
-            None
-        }
-    }
+fn prompt() -> io::Result<()> {
+    eprint!("lan-mouse > ");
+    std::io::stderr().flush()?;
+    Ok(())
+}
+
+fn print_config(c: &ClientConfig) {
+    eprint!(
+        "{}:{} ({}), ips: {:?}",
+        c.hostname.clone().unwrap_or("(no hostname)".into()),
+        c.port,
+        c.pos,
+        c.fix_ips
+    );
+}
+
+fn print_state(s: &ClientState) {
+    eprint!("active: {}, dns: {:?}", s.active, s.ips);
 }

src/frontend/cli/command.rs

@@ -0,0 +1,153 @@
+use std::{
+    fmt::Display,
+    str::{FromStr, SplitWhitespace},
+};
+
+use crate::client::{ClientHandle, Position};
+
+pub(super) enum CommandType {
+    NoCommand,
+    Help,
+    Connect,
+    Disconnect,
+    Activate,
+    Deactivate,
+    List,
+    SetHost,
+    SetPort,
+}
+
+#[derive(Debug)]
+pub(super) struct InvalidCommand {
+    cmd: String,
+}
+
+impl Display for InvalidCommand {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "invalid command: \"{}\"", self.cmd)
+    }
+}
+
+impl FromStr for CommandType {
+    type Err = InvalidCommand;
+
+    fn from_str(s: &str) -> std::prelude::v1::Result<Self, Self::Err> {
+        match s {
+            "connect" => Ok(Self::Connect),
+            "disconnect" => Ok(Self::Disconnect),
+            "activate" => Ok(Self::Activate),
+            "deactivate" => Ok(Self::Deactivate),
+            "list" => Ok(Self::List),
+            "set-host" => Ok(Self::SetHost),
+            "set-port" => Ok(Self::SetPort),
+            "help" => Ok(Self::Help),
+            _ => Err(InvalidCommand { cmd: s.to_string() }),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub(super) enum Command {
+    None,
+    Help,
+    Connect(Position, String, Option<u16>),
+    Disconnect(ClientHandle),
+    Activate(ClientHandle),
+    Deactivate(ClientHandle),
+    List,
+    SetHost(ClientHandle, String),
+    SetPort(ClientHandle, Option<u16>),
+}
+
+impl CommandType {
+    pub(super) fn usage(&self) -> &'static str {
+        match self {
+            CommandType::Help => "help",
+            CommandType::NoCommand => "",
+            CommandType::Connect => "connect left|right|top|bottom <host> [<port>]",
+            CommandType::Disconnect => "disconnect <id>",
+            CommandType::Activate => "activate <id>",
+            CommandType::Deactivate => "deactivate <id>",
+            CommandType::List => "list",
+            CommandType::SetHost => "set-host <id> <host>",
+            CommandType::SetPort => "set-port <id> <host>",
+        }
+    }
+}
+
+pub(super) enum CommandParseError {
+    Usage(CommandType),
+    Invalid(InvalidCommand),
+}
+
+impl Display for CommandParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Usage(cmd) => write!(f, "usage: {}", cmd.usage()),
+            Self::Invalid(cmd) => write!(f, "{}", cmd),
+        }
+    }
+}
+
+impl FromStr for Command {
+    type Err = CommandParseError;
+
+    fn from_str(cmd: &str) -> Result<Self, Self::Err> {
+        let mut args = cmd.split_whitespace();
+        let cmd_type: CommandType = match args.next() {
+            Some(c) => c.parse().map_err(CommandParseError::Invalid),
+            None => Ok(CommandType::NoCommand),
+        }?;
+        match cmd_type {
+            CommandType::Help => Ok(Command::Help),
+            CommandType::NoCommand => Ok(Command::None),
+            CommandType::Connect => parse_connect_cmd(args),
+            CommandType::Disconnect => parse_disconnect_cmd(args),
+            CommandType::Activate => parse_activate_cmd(args),
+            CommandType::Deactivate => parse_deactivate_cmd(args),
+            CommandType::List => Ok(Command::List),
+            CommandType::SetHost => parse_set_host(args),
+            CommandType::SetPort => parse_set_port(args),
+        }
+    }
+}
+
+fn parse_connect_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Connect);
+    let pos = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    let host = args.next().ok_or(USAGE)?.to_string();
+    let port = args.next().and_then(|p| p.parse().ok());
+    Ok(Command::Connect(pos, host, port))
+}
+
+fn parse_disconnect_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Disconnect);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::Disconnect(id))
+}
+
+fn parse_activate_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Activate);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::Activate(id))
+}
+
+fn parse_deactivate_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Deactivate);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::Deactivate(id))
+}
+
+fn parse_set_host(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::SetHost);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    let host = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::SetHost(id, host))
+}
+
+fn parse_set_port(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::SetPort);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    let port = args.next().and_then(|p| p.parse().ok());
+    Ok(Command::SetPort(id, port))
+}

src/frontend/gtk.rs

@@ -0,0 +1,167 @@
+mod client_object;
+mod client_row;
+mod window;
+
+use std::{
+    env,
+    io::{ErrorKind, Read},
+    process, str,
+};
+
+use crate::frontend::gtk::window::Window;
+
+use adw::Application;
+use endi::{Endian, ReadBytes};
+use gtk::{
+    gdk::Display, glib::clone, prelude::*, subclass::prelude::ObjectSubclassIsExt, IconTheme,
+};
+use gtk::{gio, glib, prelude::ApplicationExt};
+
+use self::client_object::ClientObject;
+
+use super::FrontendEvent;
+
+pub fn run() -> glib::ExitCode {
+    log::debug!("running gtk frontend");
+    #[cfg(windows)]
+    let ret = std::thread::Builder::new()
+        .stack_size(8 * 1024 * 1024) // https://gitlab.gnome.org/GNOME/gtk/-/commit/52dbb3f372b2c3ea339e879689c1de535ba2c2c3 -> caused crash on windows
+        .name("gtk".into())
+        .spawn(gtk_main)
+        .unwrap()
+        .join()
+        .unwrap();
+    #[cfg(not(windows))]
+    let ret = gtk_main();
+
+    if ret == glib::ExitCode::FAILURE {
+        log::error!("frontend exited with failure");
+    } else {
+        log::info!("frontend exited successfully");
+    }
+
+    ret
+}
+
+fn gtk_main() -> glib::ExitCode {
+    gio::resources_register_include!("lan-mouse.gresource").expect("Failed to register resources.");
+
+    let app = Application::builder()
+        .application_id("de.feschber.LanMouse")
+        .build();
+
+    app.connect_startup(|_| load_icons());
+    app.connect_activate(build_ui);
+
+    let args: Vec<&'static str> = vec![];
+    app.run_with_args(&args)
+}
+
+fn load_icons() {
+    let display = &Display::default().expect("Could not connect to a display.");
+    let icon_theme = IconTheme::for_display(display);
+    icon_theme.add_resource_path("/de/feschber/LanMouse/icons");
+}
+
+fn build_ui(app: &Application) {
+    log::debug!("connecting to lan-mouse-socket");
+    let mut rx = match super::wait_for_service() {
+        Ok(stream) => stream,
+        Err(e) => {
+            log::error!("could not connect to lan-mouse-socket: {e}");
+            process::exit(1);
+        }
+    };
+    let tx = match rx.try_clone() {
+        Ok(sock) => sock,
+        Err(e) => {
+            log::error!("{e}");
+            process::exit(1);
+        }
+    };
+    log::debug!("connected to lan-mouse-socket");
+
+    let (sender, receiver) = async_channel::bounded(10);
+
+    gio::spawn_blocking(move || {
+        match loop {
+            // read length
+            let len = match rx.read_u64(Endian::Big) {
+                Ok(l) => l,
+                Err(e) if e.kind() == ErrorKind::UnexpectedEof => break Ok(()),
+                Err(e) => break Err(e),
+            };
+
+            // read payload
+            let mut buf = vec![0u8; len as usize];
+            match rx.read_exact(&mut buf) {
+                Ok(_) => (),
+                Err(e) if e.kind() == ErrorKind::UnexpectedEof => break Ok(()),
+                Err(e) => break Err(e),
+            };
+
+            // parse json
+            let json = str::from_utf8(&buf).unwrap();
+            match serde_json::from_str(json) {
+                Ok(notify) => sender.send_blocking(notify).unwrap(),
+                Err(e) => log::error!("{e}"),
+            }
+        } {
+            Ok(()) => {}
+            Err(e) => log::error!("{e}"),
+        }
+    });
+
+    let window = Window::new(app, tx);
+
+    glib::spawn_future_local(clone!(
+        #[weak]
+        window,
+        async move {
+            loop {
+                let notify = receiver.recv().await.unwrap_or_else(|_| process::exit(1));
+                match notify {
+                    FrontendEvent::Created(handle, client, state) => {
+                        window.new_client(handle, client, state);
+                    }
+                    FrontendEvent::Deleted(client) => {
+                        window.delete_client(client);
+                    }
+                    FrontendEvent::State(handle, config, state) => {
+                        window.update_client_config(handle, config);
+                        window.update_client_state(handle, state);
+                    }
+                    FrontendEvent::NoSuchClient(_) => {}
+                    FrontendEvent::Error(e) => {
+                        window.show_toast(e.as_str());
+                    }
+                    FrontendEvent::Enumerate(clients) => {
+                        for (handle, client, state) in clients {
+                            if window.client_idx(handle).is_some() {
+                                window.update_client_config(handle, client);
+                                window.update_client_state(handle, state);
+                            } else {
+                                window.new_client(handle, client, state);
+                            }
+                        }
+                    }
+                    FrontendEvent::PortChanged(port, msg) => {
+                        match msg {
+                            None => window.show_toast(format!("port changed: {port}").as_str()),
+                            Some(msg) => window.show_toast(msg.as_str()),
+                        }
+                        window.imp().set_port(port);
+                    }
+                    FrontendEvent::CaptureStatus(s) => {
+                        window.set_capture(s.into());
+                    }
+                    FrontendEvent::EmulationStatus(s) => {
+                        window.set_emulation(s.into());
+                    }
+                }
+            }
+        }
+    ));
+
+    window.present();
+}

src/frontend/gtk/client_object.rs

@@ -0,0 +1,46 @@
+mod imp;
+
+use adw::subclass::prelude::*;
+use gtk::glib::{self, Object};
+
+use crate::client::{ClientConfig, ClientHandle, ClientState};
+
+glib::wrapper! {
+    pub struct ClientObject(ObjectSubclass<imp::ClientObject>);
+}
+
+impl ClientObject {
+    pub fn new(handle: ClientHandle, client: ClientConfig, state: ClientState) -> Self {
+        Object::builder()
+            .property("handle", handle)
+            .property("hostname", client.hostname)
+            .property("port", client.port as u32)
+            .property("position", client.pos.to_string())
+            .property("active", state.active)
+            .property(
+                "ips",
+                state
+                    .ips
+                    .iter()
+                    .map(|ip| ip.to_string())
+                    .collect::<Vec<_>>(),
+            )
+            .property("resolving", state.resolving)
+            .build()
+    }
+
+    pub fn get_data(&self) -> ClientData {
+        self.imp().data.borrow().clone()
+    }
+}
+
+#[derive(Default, Clone)]
+pub struct ClientData {
+    pub handle: ClientHandle,
+    pub hostname: Option<String>,
+    pub port: u32,
+    pub active: bool,
+    pub position: String,
+    pub resolving: bool,
+    pub ips: Vec<String>,
+}

src/frontend/gtk/client_object/imp.rs

@@ -0,0 +1,32 @@
+use std::cell::RefCell;
+
+use glib::Properties;
+use gtk::glib;
+use gtk::prelude::*;
+use gtk::subclass::prelude::*;
+
+use crate::client::ClientHandle;
+
+use super::ClientData;
+
+#[derive(Properties, Default)]
+#[properties(wrapper_type = super::ClientObject)]
+pub struct ClientObject {
+    #[property(name = "handle", get, set, type = ClientHandle, member = handle)]
+    #[property(name = "hostname", get, set, type = String, member = hostname)]
+    #[property(name = "port", get, set, type = u32, member = port, maximum = u16::MAX as u32)]
+    #[property(name = "active", get, set, type = bool, member = active)]
+    #[property(name = "position", get, set, type = String, member = position)]
+    #[property(name = "resolving", get, set, type = bool, member = resolving)]
+    #[property(name = "ips", get, set, type = Vec<String>, member = ips)]
+    pub data: RefCell<ClientData>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for ClientObject {
+    const NAME: &'static str = "ClientObject";
+    type Type = super::ClientObject;
+}
+
+#[glib::derived_properties]
+impl ObjectImpl for ClientObject {}

src/frontend/gtk/client_row.rs

@@ -0,0 +1,149 @@
+mod imp;
+
+use adw::prelude::*;
+use adw::subclass::prelude::*;
+use gtk::glib::{self, Object};
+
+use crate::config::DEFAULT_PORT;
+
+use super::ClientObject;
+
+glib::wrapper! {
+    pub struct ClientRow(ObjectSubclass<imp::ClientRow>)
+    @extends gtk::ListBoxRow, gtk::Widget, adw::PreferencesRow, adw::ExpanderRow,
+    @implements gtk::Accessible, gtk::Actionable, gtk::Buildable, gtk::ConstraintTarget;
+}
+
+impl ClientRow {
+    pub fn new(_client_object: &ClientObject) -> Self {
+        Object::builder().build()
+    }
+
+    pub fn bind(&self, client_object: &ClientObject) {
+        let mut bindings = self.imp().bindings.borrow_mut();
+
+        let active_binding = client_object
+            .bind_property("active", &self.imp().enable_switch.get(), "state")
+            .bidirectional()
+            .sync_create()
+            .build();
+
+        let switch_position_binding = client_object
+            .bind_property("active", &self.imp().enable_switch.get(), "active")
+            .bidirectional()
+            .sync_create()
+            .build();
+
+        let hostname_binding = client_object
+            .bind_property("hostname", &self.imp().hostname.get(), "text")
+            .transform_to(|_, v: Option<String>| {
+                if let Some(hostname) = v {
+                    Some(hostname)
+                } else {
+                    Some("".to_string())
+                }
+            })
+            .transform_from(|_, v: String| {
+                if v.as_str().trim() == "" {
+                    Some(None)
+                } else {
+                    Some(Some(v))
+                }
+            })
+            .bidirectional()
+            .sync_create()
+            .build();
+
+        let title_binding = client_object
+            .bind_property("hostname", self, "title")
+            .transform_to(|_, v: Option<String>| {
+                if let Some(hostname) = v {
+                    Some(hostname)
+                } else {
+                    Some("<span font_style=\"italic\" font_weight=\"light\" foreground=\"darkgrey\">no hostname!</span>".to_string())
+                }
+            })
+            .sync_create()
+            .build();
+
+        let port_binding = client_object
+            .bind_property("port", &self.imp().port.get(), "text")
+            .transform_from(|_, v: String| {
+                if v.is_empty() {
+                    Some(DEFAULT_PORT as u32)
+                } else {
+                    Some(v.parse::<u16>().unwrap_or(DEFAULT_PORT) as u32)
+                }
+            })
+            .transform_to(|_, v: u32| {
+                if v == 4242 {
+                    Some("".to_string())
+                } else {
+                    Some(v.to_string())
+                }
+            })
+            .bidirectional()
+            .sync_create()
+            .build();
+
+        let subtitle_binding = client_object
+            .bind_property("port", self, "subtitle")
+            .sync_create()
+            .build();
+
+        let position_binding = client_object
+            .bind_property("position", &self.imp().position.get(), "selected")
+            .transform_from(|_, v: u32| match v {
+                1 => Some("right"),
+                2 => Some("top"),
+                3 => Some("bottom"),
+                _ => Some("left"),
+            })
+            .transform_to(|_, v: String| match v.as_str() {
+                "right" => Some(1),
+                "top" => Some(2u32),
+                "bottom" => Some(3u32),
+                _ => Some(0u32),
+            })
+            .bidirectional()
+            .sync_create()
+            .build();
+
+        let resolve_binding = client_object
+            .bind_property(
+                "resolving",
+                &self.imp().dns_loading_indicator.get(),
+                "spinning",
+            )
+            .sync_create()
+            .build();
+
+        let ip_binding = client_object
+            .bind_property("ips", &self.imp().dns_button.get(), "tooltip-text")
+            .transform_to(|_, ips: Vec<String>| {
+                if ips.is_empty() {
+                    Some("no ip addresses associated with this client".into())
+                } else {
+                    Some(ips.join("\n"))
+                }
+            })
+            .sync_create()
+            .build();
+
+        bindings.push(active_binding);
+        bindings.push(switch_position_binding);
+        bindings.push(hostname_binding);
+        bindings.push(title_binding);
+        bindings.push(port_binding);
+        bindings.push(subtitle_binding);
+        bindings.push(position_binding);
+        bindings.push(resolve_binding);
+        bindings.push(ip_binding);
+    }
+
+    pub fn unbind(&self) {
+        for binding in self.imp().bindings.borrow_mut().drain(..) {
+            binding.unbind();
+        }
+    }
+}

src/frontend/gtk/client_row/imp.rs

@@ -0,0 +1,103 @@
+use std::cell::RefCell;
+
+use adw::subclass::prelude::*;
+use adw::{prelude::*, ActionRow, ComboRow};
+use glib::{subclass::InitializingObject, Binding};
+use gtk::glib::clone;
+use gtk::glib::subclass::Signal;
+use gtk::{glib, Button, CompositeTemplate, Switch};
+use std::sync::OnceLock;
+
+#[derive(CompositeTemplate, Default)]
+#[template(resource = "/de/feschber/LanMouse/client_row.ui")]
+pub struct ClientRow {
+    #[template_child]
+    pub enable_switch: TemplateChild<gtk::Switch>,
+    #[template_child]
+    pub dns_button: TemplateChild<gtk::Button>,
+    #[template_child]
+    pub hostname: TemplateChild<gtk::Entry>,
+    #[template_child]
+    pub port: TemplateChild<gtk::Entry>,
+    #[template_child]
+    pub position: TemplateChild<ComboRow>,
+    #[template_child]
+    pub delete_row: TemplateChild<ActionRow>,
+    #[template_child]
+    pub delete_button: TemplateChild<gtk::Button>,
+    #[template_child]
+    pub dns_loading_indicator: TemplateChild<gtk::Spinner>,
+    pub bindings: RefCell<Vec<Binding>>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for ClientRow {
+    // `NAME` needs to match `class` attribute of template
+    const NAME: &'static str = "ClientRow";
+    const ABSTRACT: bool = false;
+
+    type Type = super::ClientRow;
+    type ParentType = adw::ExpanderRow;
+
+    fn class_init(klass: &mut Self::Class) {
+        klass.bind_template();
+        klass.bind_template_callbacks();
+    }
+
+    fn instance_init(obj: &InitializingObject<Self>) {
+        obj.init_template();
+    }
+}
+
+impl ObjectImpl for ClientRow {
+    fn constructed(&self) {
+        self.parent_constructed();
+        self.delete_button.connect_clicked(clone!(
+            #[weak(rename_to = row)]
+            self,
+            move |button| {
+                row.handle_client_delete(button);
+            }
+        ));
+    }
+
+    fn signals() -> &'static [glib::subclass::Signal] {
+        static SIGNALS: OnceLock<Vec<Signal>> = OnceLock::new();
+        SIGNALS.get_or_init(|| {
+            vec![
+                Signal::builder("request-dns").build(),
+                Signal::builder("request-update")
+                    .param_types([bool::static_type()])
+                    .build(),
+                Signal::builder("request-delete").build(),
+            ]
+        })
+    }
+}
+
+#[gtk::template_callbacks]
+impl ClientRow {
+    #[template_callback]
+    fn handle_client_set_state(&self, state: bool, _switch: &Switch) -> bool {
+        log::debug!("state change -> requesting update");
+        self.obj().emit_by_name::<()>("request-update", &[&state]);
+        true // dont run default handler
+    }
+
+    #[template_callback]
+    fn handle_request_dns(&self, _: Button) {
+        self.obj().emit_by_name::<()>("request-dns", &[]);
+    }
+
+    #[template_callback]
+    fn handle_client_delete(&self, _button: &Button) {
+        log::debug!("delete button pressed -> requesting delete");
+        self.obj().emit_by_name::<()>("request-delete", &[]);
+    }
+}
+
+impl WidgetImpl for ClientRow {}
+impl BoxImpl for ClientRow {}
+impl ListBoxRowImpl for ClientRow {}
+impl PreferencesRowImpl for ClientRow {}
+impl ExpanderRowImpl for ClientRow {}

src/frontend/gtk/window.rs

@@ -0,0 +1,334 @@
+mod imp;
+
+use std::io::Write;
+
+#[cfg(unix)]
+use std::os::unix::net::UnixStream;
+
+#[cfg(windows)]
+use std::net::TcpStream;
+
+use adw::prelude::*;
+use adw::subclass::prelude::*;
+use endi::{Endian, WriteBytes};
+use glib::{clone, Object};
+use gtk::{
+    gio,
+    glib::{self, closure_local},
+    ListBox, NoSelection,
+};
+
+use crate::{
+    client::{ClientConfig, ClientHandle, ClientState, Position},
+    config::DEFAULT_PORT,
+    frontend::{gtk::client_object::ClientObject, FrontendRequest},
+};
+
+use super::client_row::ClientRow;
+
+glib::wrapper! {
+    pub struct Window(ObjectSubclass<imp::Window>)
+        @extends adw::ApplicationWindow, gtk::Window, gtk::Widget,
+        @implements gio::ActionGroup, gio::ActionMap, gtk::Accessible, gtk::Buildable,
+                    gtk::ConstraintTarget, gtk::Native, gtk::Root, gtk::ShortcutManager;
+}
+
+impl Window {
+    pub(crate) fn new(
+        app: &adw::Application,
+        #[cfg(unix)] tx: UnixStream,
+        #[cfg(windows)] tx: TcpStream,
+    ) -> Self {
+        let window: Self = Object::builder().property("application", app).build();
+        window.imp().stream.borrow_mut().replace(tx);
+        window
+    }
+
+    pub fn clients(&self) -> gio::ListStore {
+        self.imp()
+            .clients
+            .borrow()
+            .clone()
+            .expect("Could not get clients")
+    }
+
+    fn client_by_idx(&self, idx: u32) -> Option<ClientObject> {
+        self.clients().item(idx).map(|o| o.downcast().unwrap())
+    }
+
+    fn setup_clients(&self) {
+        let model = gio::ListStore::new::<ClientObject>();
+        self.imp().clients.replace(Some(model));
+
+        let selection_model = NoSelection::new(Some(self.clients()));
+        self.imp().client_list.bind_model(
+            Some(&selection_model),
+            clone!(
+                #[weak(rename_to = window)]
+                self,
+                #[upgrade_or_panic]
+                move |obj| {
+                    let client_object = obj
+                        .downcast_ref()
+                        .expect("Expected object of type `ClientObject`.");
+                    let row = window.create_client_row(client_object);
+                    row.connect_closure(
+                        "request-update",
+                        false,
+                        closure_local!(
+                            #[strong]
+                            window,
+                            move |row: ClientRow, active: bool| {
+                                if let Some(client) = window.client_by_idx(row.index() as u32) {
+                                    window.request_client_activate(&client, active);
+                                    window.request_client_update(&client);
+                                    window.request_client_state(&client);
+                                }
+                            }
+                        ),
+                    );
+                    row.connect_closure(
+                        "request-delete",
+                        false,
+                        closure_local!(
+                            #[strong]
+                            window,
+                            move |row: ClientRow| {
+                                if let Some(client) = window.client_by_idx(row.index() as u32) {
+                                    window.request_client_delete(&client);
+                                }
+                            }
+                        ),
+                    );
+                    row.connect_closure(
+                        "request-dns",
+                        false,
+                        closure_local!(
+                            #[strong]
+                            window,
+                            move |row: ClientRow| {
+                                if let Some(client) = window.client_by_idx(row.index() as u32) {
+                                    window.request_client_update(&client);
+                                    window.request_dns(&client);
+                                    window.request_client_state(&client);
+                                }
+                            }
+                        ),
+                    );
+                    row.upcast()
+                }
+            ),
+        );
+    }
+
+    /// workaround for a bug in libadwaita that shows an ugly line beneath
+    /// the last element if a placeholder is set.
+    /// https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/6308
+    pub fn set_placeholder_visible(&self, visible: bool) {
+        let placeholder = self.imp().client_placeholder.get();
+        self.imp().client_list.set_placeholder(match visible {
+            true => Some(&placeholder),
+            false => None,
+        });
+    }
+
+    fn setup_icon(&self) {
+        self.set_icon_name(Some("de.feschber.LanMouse"));
+    }
+
+    fn create_client_row(&self, client_object: &ClientObject) -> ClientRow {
+        let row = ClientRow::new(client_object);
+        row.bind(client_object);
+        row
+    }
+
+    pub fn new_client(&self, handle: ClientHandle, client: ClientConfig, state: ClientState) {
+        let client = ClientObject::new(handle, client, state.clone());
+        self.clients().append(&client);
+        self.set_placeholder_visible(false);
+        self.update_dns_state(handle, !state.ips.is_empty());
+    }
+
+    pub fn client_idx(&self, handle: ClientHandle) -> Option<usize> {
+        self.clients().iter::<ClientObject>().position(|c| {
+            if let Ok(c) = c {
+                c.handle() == handle
+            } else {
+                false
+            }
+        })
+    }
+
+    pub fn delete_client(&self, handle: ClientHandle) {
+        let Some(idx) = self.client_idx(handle) else {
+            log::warn!("could not find client with handle {handle}");
+            return;
+        };
+
+        self.clients().remove(idx as u32);
+        if self.clients().n_items() == 0 {
+            self.set_placeholder_visible(true);
+        }
+    }
+
+    pub fn update_client_config(&self, handle: ClientHandle, client: ClientConfig) {
+        let Some(idx) = self.client_idx(handle) else {
+            log::warn!("could not find client with handle {}", handle);
+            return;
+        };
+        let client_object = self.clients().item(idx as u32).unwrap();
+        let client_object: &ClientObject = client_object.downcast_ref().unwrap();
+        let data = client_object.get_data();
+
+        /* only change if it actually has changed, otherwise
+         * the update signal is triggered */
+        if data.hostname != client.hostname {
+            client_object.set_hostname(client.hostname.unwrap_or("".into()));
+        }
+        if data.port != client.port as u32 {
+            client_object.set_port(client.port as u32);
+        }
+        if data.position != client.pos.to_string() {
+            client_object.set_position(client.pos.to_string());
+        }
+    }
+
+    pub fn update_client_state(&self, handle: ClientHandle, state: ClientState) {
+        let Some(idx) = self.client_idx(handle) else {
+            log::warn!("could not find client with handle {}", handle);
+            return;
+        };
+        let client_object = self.clients().item(idx as u32).unwrap();
+        let client_object: &ClientObject = client_object.downcast_ref().unwrap();
+        let data = client_object.get_data();
+
+        if state.active != data.active {
+            client_object.set_active(state.active);
+            log::debug!("set active to {}", state.active);
+        }
+
+        if state.resolving != data.resolving {
+            client_object.set_resolving(state.resolving);
+            log::debug!("resolving {}: {}", data.handle, state.resolving);
+        }
+
+        self.update_dns_state(handle, !state.ips.is_empty());
+        let ips = state
+            .ips
+            .into_iter()
+            .map(|ip| ip.to_string())
+            .collect::<Vec<_>>();
+        client_object.set_ips(ips);
+    }
+
+    pub fn update_dns_state(&self, handle: ClientHandle, resolved: bool) {
+        let Some(idx) = self.client_idx(handle) else {
+            log::warn!("could not find client with handle {}", handle);
+            return;
+        };
+        let list_box: ListBox = self.imp().client_list.get();
+        let row = list_box.row_at_index(idx as i32).unwrap();
+        let client_row: ClientRow = row.downcast().expect("expected ClientRow Object");
+        if resolved {
+            client_row.imp().dns_button.set_css_classes(&["success"])
+        } else {
+            client_row.imp().dns_button.set_css_classes(&["warning"])
+        }
+    }
+
+    pub fn request_port_change(&self) {
+        let port = self
+            .imp()
+            .port_entry
+            .get()
+            .text()
+            .as_str()
+            .parse::<u16>()
+            .unwrap_or(DEFAULT_PORT);
+        self.request(FrontendRequest::ChangePort(port));
+    }
+
+    pub fn request_capture(&self) {
+        self.request(FrontendRequest::EnableCapture);
+    }
+
+    pub fn request_emulation(&self) {
+        self.request(FrontendRequest::EnableEmulation);
+    }
+
+    pub fn request_client_state(&self, client: &ClientObject) {
+        self.request(FrontendRequest::GetState(client.handle()));
+    }
+
+    pub fn request_client_create(&self) {
+        self.request(FrontendRequest::Create);
+    }
+
+    pub fn request_dns(&self, client: &ClientObject) {
+        self.request(FrontendRequest::ResolveDns(client.get_data().handle));
+    }
+
+    pub fn request_client_update(&self, client: &ClientObject) {
+        let handle = client.handle();
+        let data = client.get_data();
+        let position = Position::try_from(data.position.as_str()).expect("invalid position");
+        let hostname = data.hostname;
+        let port = data.port as u16;
+
+        for event in [
+            FrontendRequest::UpdateHostname(handle, hostname),
+            FrontendRequest::UpdatePosition(handle, position),
+            FrontendRequest::UpdatePort(handle, port),
+        ] {
+            self.request(event);
+        }
+    }
+
+    pub fn request_client_activate(&self, client: &ClientObject, active: bool) {
+        self.request(FrontendRequest::Activate(client.handle(), active));
+    }
+
+    pub fn request_client_delete(&self, client: &ClientObject) {
+        self.request(FrontendRequest::Delete(client.handle()));
+    }
+
+    pub fn request(&self, event: FrontendRequest) {
+        let json = serde_json::to_string(&event).unwrap();
+        log::debug!("requesting: {json}");
+        let mut stream = self.imp().stream.borrow_mut();
+        let stream = stream.as_mut().unwrap();
+        let bytes = json.as_bytes();
+        if let Err(e) = stream.write_u64(Endian::Big, bytes.len() as u64) {
+            log::error!("error sending message: {e}");
+        };
+        if let Err(e) = stream.write(bytes) {
+            log::error!("error sending message: {e}");
+        };
+    }
+
+    pub fn show_toast(&self, msg: &str) {
+        let toast = adw::Toast::new(msg);
+        let toast_overlay = &self.imp().toast_overlay;
+        toast_overlay.add_toast(toast);
+    }
+
+    pub fn set_capture(&self, active: bool) {
+        self.imp().capture_active.replace(active);
+        self.update_capture_emulation_status();
+    }
+
+    pub fn set_emulation(&self, active: bool) {
+        self.imp().emulation_active.replace(active);
+        self.update_capture_emulation_status();
+    }
+
+    fn update_capture_emulation_status(&self) {
+        let capture = self.imp().capture_active.get();
+        let emulation = self.imp().emulation_active.get();
+        self.imp().capture_status_row.set_visible(!capture);
+        self.imp().emulation_status_row.set_visible(!emulation);
+        self.imp()
+            .capture_emulation_group
+            .set_visible(!capture || !emulation);
+    }
+}

src/frontend/gtk/window/imp.rs

@@ -0,0 +1,158 @@
+use std::cell::{Cell, RefCell};
+
+#[cfg(windows)]
+use std::net::TcpStream;
+#[cfg(unix)]
+use std::os::unix::net::UnixStream;
+
+use adw::subclass::prelude::*;
+use adw::{prelude::*, ActionRow, PreferencesGroup, ToastOverlay};
+use glib::subclass::InitializingObject;
+use gtk::glib::clone;
+use gtk::{gdk, gio, glib, Button, CompositeTemplate, Entry, Label, ListBox};
+
+use crate::config::DEFAULT_PORT;
+
+#[derive(CompositeTemplate, Default)]
+#[template(resource = "/de/feschber/LanMouse/window.ui")]
+pub struct Window {
+    #[template_child]
+    pub port_edit_apply: TemplateChild<Button>,
+    #[template_child]
+    pub port_edit_cancel: TemplateChild<Button>,
+    #[template_child]
+    pub client_list: TemplateChild<ListBox>,
+    #[template_child]
+    pub client_placeholder: TemplateChild<ActionRow>,
+    #[template_child]
+    pub port_entry: TemplateChild<Entry>,
+    #[template_child]
+    pub hostname_label: TemplateChild<Label>,
+    #[template_child]
+    pub toast_overlay: TemplateChild<ToastOverlay>,
+    #[template_child]
+    pub capture_emulation_group: TemplateChild<PreferencesGroup>,
+    #[template_child]
+    pub capture_status_row: TemplateChild<ActionRow>,
+    #[template_child]
+    pub emulation_status_row: TemplateChild<ActionRow>,
+    #[template_child]
+    pub input_emulation_button: TemplateChild<Button>,
+    #[template_child]
+    pub input_capture_button: TemplateChild<Button>,
+    pub clients: RefCell<Option<gio::ListStore>>,
+    #[cfg(unix)]
+    pub stream: RefCell<Option<UnixStream>>,
+    #[cfg(windows)]
+    pub stream: RefCell<Option<TcpStream>>,
+    pub port: Cell<u16>,
+    pub capture_active: Cell<bool>,
+    pub emulation_active: Cell<bool>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for Window {
+    // `NAME` needs to match `class` attribute of template
+    const NAME: &'static str = "LanMouseWindow";
+    const ABSTRACT: bool = false;
+
+    type Type = super::Window;
+    type ParentType = adw::ApplicationWindow;
+
+    fn class_init(klass: &mut Self::Class) {
+        klass.bind_template();
+        klass.bind_template_callbacks();
+    }
+
+    fn instance_init(obj: &InitializingObject<Self>) {
+        obj.init_template();
+    }
+}
+
+#[gtk::template_callbacks]
+impl Window {
+    #[template_callback]
+    fn handle_add_client_pressed(&self, _button: &Button) {
+        self.obj().request_client_create();
+    }
+
+    #[template_callback]
+    fn handle_copy_hostname(&self, button: &Button) {
+        if let Ok(hostname) = hostname::get() {
+            let display = gdk::Display::default().unwrap();
+            let clipboard = display.clipboard();
+            clipboard.set_text(hostname.to_str().expect("hostname: invalid utf8"));
+            button.set_icon_name("emblem-ok-symbolic");
+            button.set_css_classes(&["success"]);
+            glib::spawn_future_local(clone!(
+                #[weak]
+                button,
+                async move {
+                    glib::timeout_future_seconds(1).await;
+                    button.set_icon_name("edit-copy-symbolic");
+                    button.set_css_classes(&[]);
+                }
+            ));
+        }
+    }
+
+    #[template_callback]
+    fn handle_port_changed(&self, _entry: &Entry) {
+        self.port_edit_apply.set_visible(true);
+        self.port_edit_cancel.set_visible(true);
+    }
+
+    #[template_callback]
+    fn handle_port_edit_apply(&self) {
+        self.obj().request_port_change();
+    }
+
+    #[template_callback]
+    fn handle_port_edit_cancel(&self) {
+        log::debug!("cancel port edit");
+        self.port_entry
+            .set_text(self.port.get().to_string().as_str());
+        self.port_edit_apply.set_visible(false);
+        self.port_edit_cancel.set_visible(false);
+    }
+
+    #[template_callback]
+    fn handle_emulation(&self) {
+        self.obj().request_emulation();
+    }
+
+    #[template_callback]
+    fn handle_capture(&self) {
+        self.obj().request_capture();
+    }
+
+    pub fn set_port(&self, port: u16) {
+        self.port.set(port);
+        if port == DEFAULT_PORT {
+            self.port_entry.set_text("");
+        } else {
+            self.port_entry.set_text(format!("{port}").as_str());
+        }
+        self.port_edit_apply.set_visible(false);
+        self.port_edit_cancel.set_visible(false);
+    }
+}
+
+impl ObjectImpl for Window {
+    fn constructed(&self) {
+        if let Ok(hostname) = hostname::get() {
+            self.hostname_label
+                .set_text(hostname.to_str().expect("hostname: invalid utf8"));
+        }
+        self.parent_constructed();
+        self.set_port(DEFAULT_PORT);
+        let obj = self.obj();
+        obj.setup_icon();
+        obj.setup_clients();
+    }
+}
+
+impl WidgetImpl for Window {}
+impl WindowImpl for Window {}
+impl ApplicationWindowImpl for Window {}
+impl AdwApplicationWindowImpl for Window {}

src/ioutils.rs

@@ -1,49 +0,0 @@
-use std::io::{self, Write};
-
-use crate::client::Position;
-
-
-pub fn ask_confirmation(default: bool) -> Result<bool, io::Error> {
-    eprint!("{}", if default {" [Y,n] "} else { " [y,N] "});
-    io::stderr().flush()?;
-    let answer = loop {
-        let mut buffer = String::new();
-        io::stdin().read_line(&mut buffer)?;
-        let answer = buffer.to_lowercase();
-        let answer = answer.trim();
-        match answer {
-            "" => break default,
-            "y" => break true,
-            "n" => break false,
-            _ => {
-                eprint!("Enter y for Yes or n for No: ");
-                io::stderr().flush()?;
-                continue
-            }
-        }
-    };
-    Ok(answer)
-}
-
-pub fn ask_position() -> Result<Position, io::Error> {
-    eprint!("Enter position - top (t) | bottom (b) | left(l) | right(r): ");
-    io::stderr().flush()?;
-    let pos = loop {
-        let mut buffer = String::new();
-        io::stdin().read_line(&mut buffer)?;
-        let answer = buffer.to_lowercase();
-        let answer = answer.trim();
-        match answer {
-            "t" | "top" => break Position::Top,
-            "b" | "bottom" => break Position::Bottom,
-            "l" | "left" => break Position::Right,
-            "r" | "right" => break Position::Left,
-            _ => {
-                eprint!("Invalid position: {answer} - enter top (t) | bottom (b) | left(l) | right(r): ");
-                io::stderr().flush()?;
-                continue
-            }
-        };
-    };
-    Ok(pos)
-}

src/lib.rs

@@ -1,11 +1,8 @@
 pub mod client;
 pub mod config;
 pub mod dns;
-pub mod event;
+pub mod server;
 
-pub mod consumer;
-pub mod producer;
-
-pub mod backend;
+pub mod capture_test;
+pub mod emulation_test;
 pub mod frontend;
-pub mod ioutils;

src/main.rs

@@ -1,14 +1,12 @@
-use std::{process, error::Error};
+use anyhow::Result;
+use std::process::{self, Child, Command};
 
 use env_logger::Env;
-use lan_mouse::{
-    consumer, producer,
-    config::{Config, Frontend::{Gtk, Cli}}, event::server::Server,
-    frontend::{FrontendAdapter, cli::CliFrontend},
-};
+use lan_mouse::{capture_test, config::Config, emulation_test, frontend, server::Server};
+
+use tokio::task::LocalSet;
 
 pub fn main() {
-
     // init logging
     let env = Env::default().filter_or("LAN_MOUSE_LOG_LEVEL", "info");
     env_logger::init_from_env(env);
@@ -19,47 +17,64 @@ pub fn main() {
     }
 }
 
-pub fn run() -> Result<(), Box<dyn Error>> {
-    // parse config file
+pub fn start_service() -> Result<Child> {
+    let child = Command::new(std::env::current_exe()?)
+        .args(std::env::args().skip(1))
+        .arg("--daemon")
+        .spawn()?;
+    Ok(child)
+}
+
+pub fn run() -> Result<()> {
+    // parse config file + cli args
     let config = Config::new()?;
+    log::debug!("{config:?}");
+    log::info!("release bind: {:?}", config.release_bind);
 
-    // start producing and consuming events
-    let producer = producer::create()?;
-    let consumer = consumer::create()?;
-
-    // create frontend communication adapter
-    let frontend_adapter = FrontendAdapter::new()?;
-
-    // start sending and receiving events
-    let mut event_server = Server::new(config.port, producer, consumer, frontend_adapter)?;
-
-    // add clients form config
-    config.get_clients().into_iter().for_each(|(c, h, p)| {
-        let host_name = match h {
-            Some(h) => format!(" '{}'", h),
-            None => "".to_owned(),
-        };
-        if c.len() == 0 {
-            log::warn!("ignoring client{} with 0 assigned ips!", host_name);
+    if config.test_capture {
+        capture_test::run()?;
+    } else if config.test_emulation {
+        emulation_test::run()?;
+    } else if config.daemon {
+        // if daemon is specified we run the service
+        run_service(config)?;
+    } else {
+        //  otherwise start the service as a child process and
+        //  run a frontend
+        let mut service = start_service()?;
+        frontend::run_frontend(&config)?;
+        #[cfg(unix)]
+        {
+            // on unix we give the service a chance to terminate gracefully
+            let pid = service.id() as libc::pid_t;
+            unsafe {
+                libc::kill(pid, libc::SIGINT);
+            }
+            service.wait()?;
         }
-        log::info!("adding client [{}]{} @ {:?}", p, host_name, c);
-        event_server.add_client(c, p);
-    });
+        service.kill()?;
+    }
 
-    // any threads need to be started after event_server sets up signal handling
-    match config.frontend {
-        Gtk => {
-            #[cfg(all(unix, feature = "gtk"))]
-            frontend::gtk::create();
-            #[cfg(not(feature = "gtk"))]
-            panic!("gtk frontend requested but feature not enabled!");
-        },
-        Cli => Box::new(CliFrontend::new()?),
-    };
+    anyhow::Ok(())
+}
 
-    log::info!("Press Ctrl+Alt+Shift+Super to release the mouse");
-    // run event loop
-    event_server.run()?;
+fn run_service(config: Config) -> Result<()> {
+    // create single threaded tokio runtime
+    let runtime = tokio::runtime::Builder::new_current_thread()
+        .enable_io()
+        .enable_time()
+        .build()?;
 
+    // run async event loop
+    runtime.block_on(LocalSet::new().run_until(async {
+        // run main loop
+        log::info!("Press {:?} to release the mouse", config.release_bind);
+
+        let mut server = Server::new(config);
+        server.run().await?;
+
+        log::debug!("service exiting");
+        anyhow::Ok(())
+    }))?;
     Ok(())
 }

src/producer.rs

@@ -1,63 +0,0 @@
-use mio::event::Source;
-use std::{error::Error, vec::Drain};
-use crate::{client::{ClientHandle, ClientEvent}, event::Event};
-use crate::backend::producer;
-
-#[cfg(unix)]
-use std::env;
-
-#[cfg(unix)]
-enum Backend {
-    Wayland,
-    X11,
-}
-
-pub fn create() -> Result<Box<dyn EventProducer>, Box<dyn Error>> {
-    #[cfg(windows)]
-    return Ok(Box::new(producer::windows::WindowsProducer::new()));
-
-    #[cfg(unix)]
-    let backend = match env::var("XDG_SESSION_TYPE") {
-        Ok(session_type) => match session_type.as_str() {
-            "x11" => {
-                log::info!("XDG_SESSION_TYPE = x11 -> using X11 event producer");
-                Backend::X11
-            },
-            "wayland" => {
-                log::info!("XDG_SESSION_TYPE = wayland -> using wayland event producer");
-                Backend::Wayland
-            }
-            _ => panic!("unknown XDG_SESSION_TYPE"),
-        },
-        Err(_) => panic!("could not detect session type: XDG_SESSION_TYPE environment variable not set!"),
-    };
-
-    #[cfg(unix)]
-    match backend {
-        Backend::X11 => {
-            #[cfg(not(feature = "x11"))]
-            panic!("feature x11 not enabled");
-            #[cfg(feature = "x11")]
-            Ok(Box::new(producer::x11::X11Producer::new()))
-        }
-        Backend::Wayland => {
-            #[cfg(not(feature = "wayland"))]
-            panic!("feature wayland not enabled");
-            #[cfg(feature = "wayland")]
-            Ok(Box::new(producer::wayland::WaylandEventProducer::new()?))
-        }
-    }
-}
-
-pub trait EventProducer: Source {
-    /// notify event producer of configuration changes
-    fn notify(&mut self, event: ClientEvent);
-
-    /// read an event
-    /// this function must be invoked to retrieve an Event after
-    /// the eventfd indicates a pending Event
-    fn read_events(&mut self) -> Drain<(ClientHandle, Event)>;
-
-    /// release mouse
-    fn release(&mut self);
-}

src/server.rs

@@ -0,0 +1,599 @@
+use capture_task::CaptureEvent;
+use emulation_task::EmulationEvent;
+use log;
+use std::{
+    cell::{Cell, RefCell},
+    collections::{HashSet, VecDeque},
+    io::ErrorKind,
+    net::{IpAddr, SocketAddr},
+    rc::Rc,
+};
+use tokio::{
+    io::ReadHalf,
+    join, signal,
+    sync::{
+        mpsc::{channel, Sender},
+        Notify,
+    },
+    task::JoinHandle,
+};
+use tokio_util::sync::CancellationToken;
+
+use crate::{
+    client::{ClientConfig, ClientHandle, ClientManager, ClientState, Position},
+    config::Config,
+    dns::DnsResolver,
+    frontend::{self, FrontendEvent, FrontendListener, FrontendRequest, Status},
+};
+
+#[cfg(unix)]
+use tokio::net::UnixStream;
+
+#[cfg(windows)]
+use tokio::net::TcpStream;
+
+mod capture_task;
+mod emulation_task;
+mod network_task;
+mod ping_task;
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+enum State {
+    /// Currently sending events to another device
+    Sending,
+    /// Currently receiving events from other devices
+    Receiving,
+    /// Entered the deadzone of another device but waiting
+    /// for acknowledgement (Leave event) from the device
+    AwaitingLeave,
+}
+
+#[derive(Clone)]
+pub struct Server {
+    active_client: Rc<Cell<Option<ClientHandle>>>,
+    pub(crate) client_manager: Rc<RefCell<ClientManager>>,
+    port: Rc<Cell<u16>>,
+    state: Rc<Cell<State>>,
+    release_bind: Vec<input_event::scancode::Linux>,
+    notifies: Rc<Notifies>,
+    config: Rc<Config>,
+    pending_frontend_events: Rc<RefCell<VecDeque<FrontendEvent>>>,
+    pending_dns_requests: Rc<RefCell<VecDeque<ClientHandle>>>,
+    capture_status: Rc<Cell<Status>>,
+    emulation_status: Rc<Cell<Status>>,
+}
+
+#[derive(Default)]
+struct Notifies {
+    capture: Notify,
+    emulation: Notify,
+    ping: Notify,
+    port_changed: Notify,
+    frontend_event_pending: Notify,
+    dns_request_pending: Notify,
+    cancel: CancellationToken,
+}
+
+impl Server {
+    pub fn new(config: Config) -> Self {
+        let active_client = Rc::new(Cell::new(None));
+        let client_manager = Rc::new(RefCell::new(ClientManager::default()));
+        let state = Rc::new(Cell::new(State::Receiving));
+        let port = Rc::new(Cell::new(config.port));
+        for config_client in config.get_clients() {
+            let client = ClientConfig {
+                hostname: config_client.hostname,
+                fix_ips: config_client.ips.into_iter().collect(),
+                port: config_client.port,
+                pos: config_client.pos,
+                cmd: config_client.enter_hook,
+            };
+            let state = ClientState {
+                active: config_client.active,
+                ips: HashSet::from_iter(client.fix_ips.iter().cloned()),
+                ..Default::default()
+            };
+            let mut client_manager = client_manager.borrow_mut();
+            let handle = client_manager.add_client();
+            let c = client_manager.get_mut(handle).expect("invalid handle");
+            *c = (client, state);
+        }
+
+        // task notification tokens
+        let notifies = Rc::new(Notifies::default());
+        let release_bind = config.release_bind.clone();
+
+        let config = Rc::new(config);
+
+        Self {
+            config,
+            active_client,
+            client_manager,
+            port,
+            state,
+            release_bind,
+            notifies,
+            pending_frontend_events: Rc::new(RefCell::new(VecDeque::new())),
+            pending_dns_requests: Rc::new(RefCell::new(VecDeque::new())),
+            capture_status: Default::default(),
+            emulation_status: Default::default(),
+        }
+    }
+
+    pub async fn run(&mut self) -> anyhow::Result<()> {
+        // create frontend communication adapter, exit if already running
+        let mut frontend = match FrontendListener::new().await {
+            Some(f) => f?,
+            None => {
+                log::info!("service already running, exiting");
+                return Ok(());
+            }
+        };
+
+        let (capture_tx, capture_rx) = channel(1); /* requests for input capture */
+        let (emulation_tx, emulation_rx) = channel(1); /* emulation requests */
+        let (udp_recv_tx, udp_recv_rx) = channel(1); /* udp receiver */
+        let (udp_send_tx, udp_send_rx) = channel(1); /* udp sender */
+        let (request_tx, mut request_rx) = channel(1); /* frontend requests */
+        let (dns_tx, dns_rx) = channel(1); /* dns requests */
+
+        // udp task
+        let network = network_task::new(self.clone(), udp_recv_tx.clone(), udp_send_rx).await?;
+
+        // input capture
+        let capture = capture_task::new(self.clone(), capture_rx, udp_send_tx.clone());
+
+        // input emulation
+        let emulation = emulation_task::new(
+            self.clone(),
+            emulation_rx,
+            udp_recv_rx,
+            udp_send_tx.clone(),
+            capture_tx.clone(),
+        );
+
+        // create dns resolver
+        let resolver = DnsResolver::new(dns_rx)?;
+        let dns_task = tokio::task::spawn_local(resolver.run(self.clone()));
+
+        // task that pings clients to see if they are responding
+        let ping = ping_task::new(
+            self.clone(),
+            udp_send_tx.clone(),
+            emulation_tx.clone(),
+            capture_tx.clone(),
+        );
+
+        for handle in self.active_clients() {
+            self.request_dns(handle);
+        }
+
+        log::info!("running service");
+
+        let mut join_handles = vec![];
+
+        loop {
+            tokio::select! {
+                stream = frontend.accept() => {
+                    match stream {
+                        Ok(s) => join_handles.push(handle_frontend_stream(self.notifies.cancel.clone(), s, request_tx.clone())),
+                        Err(e) => log::warn!("error accepting frontend connection: {e}"),
+                    };
+                    self.enumerate();
+                    self.notify_frontend(FrontendEvent::EmulationStatus(self.emulation_status.get()));
+                    self.notify_frontend(FrontendEvent::CaptureStatus(self.capture_status.get()));
+                    self.notify_frontend(FrontendEvent::PortChanged(self.port.get(), None));
+                }
+                request = request_rx.recv() => {
+                    let request = request.expect("channel closed");
+                    log::debug!("received frontend request: {request:?}");
+                    self.handle_request(&capture_tx.clone(), &emulation_tx.clone(), request).await;
+                    log::debug!("handled frontend request");
+                }
+                _ = self.notifies.frontend_event_pending.notified() => {
+                    while let Some(event) = {
+                        /* need to drop borrow before next iteration! */
+                        let event = self.pending_frontend_events.borrow_mut().pop_front();
+                        event
+                    } {
+                        frontend.broadcast(event).await;
+                    }
+                },
+                _ = self.notifies.dns_request_pending.notified() => {
+                    while let Some(request) = {
+                        /* need to drop borrow before next iteration! */
+                        let request = self.pending_dns_requests.borrow_mut().pop_front();
+                        request
+                    } {
+                        dns_tx.send(request).await.expect("channel closed");
+                    }
+                }
+                _ = self.cancelled() => break,
+                r = signal::ctrl_c() => {
+                    r.expect("failed to wait for CTRL+C");
+                    break;
+                }
+            }
+        }
+
+        log::info!("terminating service");
+
+        assert!(!capture_tx.is_closed());
+        assert!(!emulation_tx.is_closed());
+        assert!(!udp_recv_tx.is_closed());
+        assert!(!udp_send_tx.is_closed());
+        assert!(!request_tx.is_closed());
+        assert!(!dns_tx.is_closed());
+
+        self.cancel();
+        futures::future::join_all(join_handles).await;
+        let _ = join!(capture, dns_task, emulation, network, ping);
+
+        Ok(())
+    }
+
+    fn notify_frontend(&self, event: FrontendEvent) {
+        self.pending_frontend_events.borrow_mut().push_back(event);
+        self.notifies.frontend_event_pending.notify_one();
+    }
+
+    fn cancel(&self) {
+        self.notifies.cancel.cancel();
+    }
+
+    pub(crate) async fn cancelled(&self) {
+        self.notifies.cancel.cancelled().await
+    }
+
+    fn is_cancelled(&self) -> bool {
+        self.notifies.cancel.is_cancelled()
+    }
+
+    fn notify_capture(&self) {
+        self.notifies.capture.notify_waiters()
+    }
+
+    async fn capture_notified(&self) {
+        self.notifies.capture.notified().await
+    }
+
+    fn notify_emulation(&self) {
+        self.notifies.emulation.notify_waiters()
+    }
+
+    async fn emulation_notified(&self) {
+        self.notifies.emulation.notified().await
+    }
+
+    fn restart_ping_timer(&self) {
+        self.notifies.ping.notify_waiters()
+    }
+
+    async fn ping_timer_notified(&self) {
+        self.notifies.ping.notified().await
+    }
+
+    fn request_port_change(&self, port: u16) {
+        self.port.replace(port);
+        self.notifies.port_changed.notify_one();
+    }
+
+    fn notify_port_changed(&self, port: u16, msg: Option<String>) {
+        self.port.replace(port);
+        self.notify_frontend(FrontendEvent::PortChanged(port, msg));
+    }
+
+    pub(crate) fn client_updated(&self, handle: ClientHandle) {
+        let state = self.client_manager.borrow().get(handle).cloned();
+        if let Some((config, state)) = state {
+            self.notify_frontend(FrontendEvent::State(handle, config, state));
+        }
+    }
+
+    fn active_clients(&self) -> Vec<ClientHandle> {
+        self.client_manager
+            .borrow()
+            .get_client_states()
+            .filter(|(_, (_, s))| s.active)
+            .map(|(h, _)| h)
+            .collect()
+    }
+
+    fn request_dns(&self, handle: ClientHandle) {
+        self.pending_dns_requests.borrow_mut().push_back(handle);
+        self.notifies.dns_request_pending.notify_one();
+    }
+
+    async fn handle_request(
+        &self,
+        capture: &Sender<CaptureEvent>,
+        emulate: &Sender<EmulationEvent>,
+        event: FrontendRequest,
+    ) -> bool {
+        log::debug!("frontend: {event:?}");
+        match event {
+            FrontendRequest::EnableCapture => {
+                log::info!("received capture enable request");
+                self.notify_capture();
+            }
+            FrontendRequest::EnableEmulation => {
+                log::info!("received emulation enable request");
+                self.notify_emulation();
+            }
+            FrontendRequest::Create => {
+                let handle = self.add_client().await;
+                self.request_dns(handle);
+            }
+            FrontendRequest::Activate(handle, active) => {
+                if active {
+                    self.activate_client(capture, emulate, handle).await;
+                } else {
+                    self.deactivate_client(capture, emulate, handle).await;
+                }
+            }
+            FrontendRequest::ChangePort(port) => self.request_port_change(port),
+            FrontendRequest::Delete(handle) => {
+                self.remove_client(capture, emulate, handle).await;
+                self.notify_frontend(FrontendEvent::Deleted(handle));
+            }
+            FrontendRequest::Enumerate() => self.enumerate(),
+            FrontendRequest::GetState(handle) => self.broadcast_client(handle),
+            FrontendRequest::UpdateFixIps(handle, fix_ips) => {
+                self.update_fix_ips(handle, fix_ips);
+                self.request_dns(handle);
+            }
+            FrontendRequest::UpdateHostname(handle, host) => self.update_hostname(handle, host),
+            FrontendRequest::UpdatePort(handle, port) => self.update_port(handle, port),
+            FrontendRequest::UpdatePosition(handle, pos) => {
+                self.update_pos(handle, capture, emulate, pos).await;
+            }
+            FrontendRequest::ResolveDns(handle) => self.request_dns(handle),
+        };
+        false
+    }
+
+    fn enumerate(&self) {
+        let clients = self
+            .client_manager
+            .borrow()
+            .get_client_states()
+            .map(|(h, (c, s))| (h, c.clone(), s.clone()))
+            .collect();
+        self.notify_frontend(FrontendEvent::Enumerate(clients));
+    }
+
+    async fn add_client(&self) -> ClientHandle {
+        let handle = self.client_manager.borrow_mut().add_client();
+        log::info!("added client {handle}");
+        let (c, s) = self.client_manager.borrow().get(handle).unwrap().clone();
+        self.notify_frontend(FrontendEvent::Created(handle, c, s));
+        handle
+    }
+
+    async fn deactivate_client(
+        &self,
+        capture: &Sender<CaptureEvent>,
+        emulate: &Sender<EmulationEvent>,
+        handle: ClientHandle,
+    ) {
+        log::debug!("deactivating client {handle}");
+        match self.client_manager.borrow_mut().get_mut(handle) {
+            Some((_, s)) => s.active = false,
+            None => return,
+        };
+
+        let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+        let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
+        log::debug!("deactivating client {handle} done");
+    }
+
+    async fn activate_client(
+        &self,
+        capture: &Sender<CaptureEvent>,
+        emulate: &Sender<EmulationEvent>,
+        handle: ClientHandle,
+    ) {
+        log::debug!("activating client");
+        /* deactivate potential other client at this position */
+        let pos = match self.client_manager.borrow().get(handle) {
+            Some((client, _)) => client.pos,
+            None => return,
+        };
+
+        let other = self.client_manager.borrow_mut().find_client(pos);
+        if let Some(other) = other {
+            if other != handle {
+                self.deactivate_client(capture, emulate, other).await;
+            }
+        }
+
+        /* activate the client */
+        if let Some((_, s)) = self.client_manager.borrow_mut().get_mut(handle) {
+            s.active = true;
+        } else {
+            return;
+        };
+
+        /* notify emulation, capture and frontends */
+        let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
+        let _ = emulate.send(EmulationEvent::Create(handle)).await;
+        log::debug!("activating client {handle} done");
+    }
+
+    async fn remove_client(
+        &self,
+        capture: &Sender<CaptureEvent>,
+        emulate: &Sender<EmulationEvent>,
+        handle: ClientHandle,
+    ) {
+        let Some(active) = self
+            .client_manager
+            .borrow_mut()
+            .remove_client(handle)
+            .map(|(_, s)| s.active)
+        else {
+            return;
+        };
+
+        if active {
+            let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+            let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
+        }
+    }
+
+    fn update_fix_ips(&self, handle: ClientHandle, fix_ips: Vec<IpAddr>) {
+        if let Some((c, _)) = self.client_manager.borrow_mut().get_mut(handle) {
+            c.fix_ips = fix_ips;
+        };
+        self.update_ips(handle);
+    }
+
+    pub(crate) fn update_dns_ips(&self, handle: ClientHandle, dns_ips: Vec<IpAddr>) {
+        if let Some((_, s)) = self.client_manager.borrow_mut().get_mut(handle) {
+            s.dns_ips = dns_ips;
+        };
+        self.update_ips(handle);
+    }
+
+    fn update_ips(&self, handle: ClientHandle) {
+        if let Some((c, s)) = self.client_manager.borrow_mut().get_mut(handle) {
+            s.ips = c
+                .fix_ips
+                .iter()
+                .cloned()
+                .chain(s.dns_ips.iter().cloned())
+                .collect::<HashSet<_>>();
+        }
+    }
+
+    fn update_hostname(&self, handle: ClientHandle, hostname: Option<String>) {
+        let mut client_manager = self.client_manager.borrow_mut();
+        let Some((c, s)) = client_manager.get_mut(handle) else {
+            return;
+        };
+
+        // hostname changed
+        if c.hostname != hostname {
+            c.hostname = hostname;
+            s.ips = HashSet::from_iter(c.fix_ips.iter().cloned());
+            s.active_addr = None;
+            self.request_dns(handle);
+        }
+    }
+
+    fn update_port(&self, handle: ClientHandle, port: u16) {
+        let mut client_manager = self.client_manager.borrow_mut();
+        let Some((c, s)) = client_manager.get_mut(handle) else {
+            return;
+        };
+
+        if c.port != port {
+            c.port = port;
+            s.active_addr = s.active_addr.map(|a| SocketAddr::new(a.ip(), port));
+        }
+    }
+
+    async fn update_pos(
+        &self,
+        handle: ClientHandle,
+        capture: &Sender<CaptureEvent>,
+        emulate: &Sender<EmulationEvent>,
+        pos: Position,
+    ) {
+        let (changed, active) = {
+            let mut client_manager = self.client_manager.borrow_mut();
+            let Some((c, s)) = client_manager.get_mut(handle) else {
+                return;
+            };
+
+            let changed = c.pos != pos;
+            c.pos = pos;
+            (changed, s.active)
+        };
+
+        // update state in event input emulator & input capture
+        if changed {
+            if active {
+                let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+                let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
+            }
+            let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
+            let _ = emulate.send(EmulationEvent::Create(handle)).await;
+        }
+    }
+
+    fn broadcast_client(&self, handle: ClientHandle) {
+        let client = self.client_manager.borrow().get(handle).cloned();
+        let event = if let Some((config, state)) = client {
+            FrontendEvent::State(handle, config, state)
+        } else {
+            FrontendEvent::NoSuchClient(handle)
+        };
+        self.notify_frontend(event);
+    }
+
+    fn set_emulation_status(&self, status: Status) {
+        self.emulation_status.replace(status);
+        let status = FrontendEvent::EmulationStatus(status);
+        self.notify_frontend(status);
+    }
+
+    fn set_capture_status(&self, status: Status) {
+        self.capture_status.replace(status);
+        let status = FrontendEvent::CaptureStatus(status);
+        self.notify_frontend(status);
+    }
+
+    pub(crate) fn set_resolving(&self, handle: ClientHandle, status: bool) {
+        if let Some((_, s)) = self.client_manager.borrow_mut().get_mut(handle) {
+            s.resolving = status;
+        }
+        self.client_updated(handle);
+    }
+
+    pub(crate) fn get_hostname(&self, handle: u64) -> Option<String> {
+        self.client_manager
+            .borrow_mut()
+            .get_mut(handle)
+            .and_then(|(c, _)| c.hostname.clone())
+    }
+}
+
+async fn listen_frontend(
+    request_tx: Sender<FrontendRequest>,
+    #[cfg(unix)] mut stream: ReadHalf<UnixStream>,
+    #[cfg(windows)] mut stream: ReadHalf<TcpStream>,
+) {
+    use std::io;
+    loop {
+        let request = frontend::wait_for_request(&mut stream).await;
+        match request {
+            Ok(request) => {
+                let _ = request_tx.send(request).await;
+            }
+            Err(e) => {
+                if let Some(e) = e.downcast_ref::<io::Error>() {
+                    if e.kind() == ErrorKind::UnexpectedEof {
+                        return;
+                    }
+                }
+                log::error!("error reading frontend event: {e}");
+                return;
+            }
+        }
+    }
+}
+
+fn handle_frontend_stream(
+    cancel: CancellationToken,
+    #[cfg(unix)] stream: ReadHalf<UnixStream>,
+    #[cfg(windows)] stream: ReadHalf<TcpStream>,
+    request_tx: Sender<FrontendRequest>,
+) -> JoinHandle<()> {
+    tokio::task::spawn_local(async move {
+        tokio::select! {
+            _ = listen_frontend(request_tx, stream) => {},
+            _ = cancel.cancelled() => {},
+        }
+    })
+}

src/server/capture_task.rs

@@ -0,0 +1,241 @@
+use futures::StreamExt;
+use std::{collections::HashSet, net::SocketAddr};
+
+use tokio::{
+    process::Command,
+    sync::mpsc::{Receiver, Sender},
+    task::JoinHandle,
+};
+
+use input_capture::{self, CaptureError, CaptureHandle, InputCapture, InputCaptureError, Position};
+
+use input_event::{scancode, Event, KeyboardEvent};
+
+use crate::{client::ClientHandle, frontend::Status, server::State};
+
+use super::Server;
+
+#[derive(Clone, Copy, Debug)]
+pub(crate) enum CaptureEvent {
+    /// capture must release the mouse
+    Release,
+    /// add a capture client
+    Create(CaptureHandle, Position),
+    /// destory a capture client
+    Destroy(CaptureHandle),
+}
+
+pub(crate) fn new(
+    server: Server,
+    capture_rx: Receiver<CaptureEvent>,
+    udp_send: Sender<(Event, SocketAddr)>,
+) -> JoinHandle<()> {
+    let backend = server.config.capture_backend.map(|b| b.into());
+    tokio::task::spawn_local(capture_task(server, backend, udp_send, capture_rx))
+}
+
+async fn capture_task(
+    server: Server,
+    backend: Option<input_capture::Backend>,
+    sender_tx: Sender<(Event, SocketAddr)>,
+    mut notify_rx: Receiver<CaptureEvent>,
+) {
+    loop {
+        if let Err(e) = do_capture(backend, &server, &sender_tx, &mut notify_rx).await {
+            log::warn!("input capture exited: {e}");
+        }
+        server.set_capture_status(Status::Disabled);
+        if server.is_cancelled() {
+            break;
+        }
+
+        // allow cancellation
+        loop {
+            tokio::select! {
+                _ = notify_rx.recv() => continue, /* need to ignore requests here! */
+                _ = server.capture_notified() => break,
+                _ = server.cancelled() => return,
+            }
+        }
+    }
+}
+
+async fn do_capture(
+    backend: Option<input_capture::Backend>,
+    server: &Server,
+    sender_tx: &Sender<(Event, SocketAddr)>,
+    notify_rx: &mut Receiver<CaptureEvent>,
+) -> Result<(), InputCaptureError> {
+    /* allow cancelling capture request */
+    let mut capture = tokio::select! {
+        r = input_capture::create(backend) => {
+            r?
+        },
+        _ = server.cancelled() => return Ok(()),
+    };
+
+    server.set_capture_status(Status::Enabled);
+
+    // FIXME DUPLICATES
+    let clients = server
+        .client_manager
+        .borrow()
+        .get_client_states()
+        .map(|(h, s)| (h, s.clone()))
+        .collect::<Vec<_>>();
+    log::info!("{clients:?}");
+    for (handle, (config, _state)) in clients {
+        capture.create(handle, config.pos.into()).await?;
+    }
+
+    let mut pressed_keys = HashSet::new();
+    loop {
+        tokio::select! {
+            event = capture.next() => {
+                match event {
+                    Some(Ok(event)) => handle_capture_event(server, &mut capture, sender_tx, event, &mut pressed_keys).await?,
+                    Some(Err(e)) => return Err(e.into()),
+                    None => return Ok(()),
+                }
+            }
+            e = notify_rx.recv() => {
+                log::debug!("input capture notify rx: {e:?}");
+                match e {
+                    Some(e) => match e {
+                        CaptureEvent::Release => {
+                            capture.release().await?;
+                            server.state.replace(State::Receiving);
+                        }
+                        CaptureEvent::Create(h, p) => capture.create(h, p).await?,
+                        CaptureEvent::Destroy(h) => capture.destroy(h).await?,
+                    },
+                    None => break,
+                }
+            }
+            _ = server.cancelled() => break,
+        }
+    }
+    capture.terminate().await?;
+    Ok(())
+}
+
+fn update_pressed_keys(pressed_keys: &mut HashSet<scancode::Linux>, key: u32, state: u8) {
+    if let Ok(scancode) = scancode::Linux::try_from(key) {
+        log::debug!("key: {key}, state: {state}, scancode: {scancode:?}");
+        match state {
+            1 => pressed_keys.insert(scancode),
+            _ => pressed_keys.remove(&scancode),
+        };
+    }
+}
+
+async fn handle_capture_event(
+    server: &Server,
+    capture: &mut Box<dyn InputCapture>,
+    sender_tx: &Sender<(Event, SocketAddr)>,
+    event: (CaptureHandle, Event),
+    pressed_keys: &mut HashSet<scancode::Linux>,
+) -> Result<(), CaptureError> {
+    let (handle, mut e) = event;
+    log::trace!("({handle}) {e:?}");
+
+    if let Event::Keyboard(KeyboardEvent::Key { key, state, .. }) = e {
+        update_pressed_keys(pressed_keys, key, state);
+        log::debug!("{pressed_keys:?}");
+        if server.release_bind.iter().all(|k| pressed_keys.contains(k)) {
+            pressed_keys.clear();
+            log::info!("releasing pointer");
+            capture.release().await?;
+            server.state.replace(State::Receiving);
+            log::trace!("STATE ===> Receiving");
+            // send an event to release all the modifiers
+            e = Event::Disconnect();
+        }
+    }
+
+    let info = {
+        let mut enter = false;
+        let mut start_timer = false;
+
+        // get client state for handle
+        let mut client_manager = server.client_manager.borrow_mut();
+        let client_state = client_manager.get_mut(handle).map(|(_, s)| s);
+        if let Some(client_state) = client_state {
+            // if we just entered the client we want to send additional enter events until
+            // we get a leave event
+            if let Event::Enter() = e {
+                server.state.replace(State::AwaitingLeave);
+                server.active_client.replace(Some(handle));
+                log::trace!("Active client => {}", handle);
+                start_timer = true;
+                log::trace!("STATE ===> AwaitingLeave");
+                enter = true;
+            } else {
+                // ignore any potential events in receiving mode
+                if server.state.get() == State::Receiving && e != Event::Disconnect() {
+                    return Ok(());
+                }
+            }
+            Some((client_state.active_addr, enter, start_timer))
+        } else {
+            None
+        }
+    };
+
+    let (addr, enter, start_timer) = match info {
+        Some(i) => i,
+        None => {
+            // should not happen
+            log::warn!("unknown client!");
+            capture.release().await?;
+            server.state.replace(State::Receiving);
+            log::trace!("STATE ===> Receiving");
+            return Ok(());
+        }
+    };
+
+    if start_timer {
+        server.restart_ping_timer();
+    }
+    if enter {
+        spawn_hook_command(server, handle);
+    }
+    if let Some(addr) = addr {
+        if enter {
+            let _ = sender_tx.send((Event::Enter(), addr)).await;
+        }
+        let _ = sender_tx.send((e, addr)).await;
+    }
+    Ok(())
+}
+
+fn spawn_hook_command(server: &Server, handle: ClientHandle) {
+    let Some(cmd) = server
+        .client_manager
+        .borrow()
+        .get(handle)
+        .and_then(|(c, _)| c.cmd.clone())
+    else {
+        return;
+    };
+    tokio::task::spawn_local(async move {
+        log::info!("spawning command!");
+        let mut child = match Command::new("sh").arg("-c").arg(cmd.as_str()).spawn() {
+            Ok(c) => c,
+            Err(e) => {
+                log::warn!("could not execute cmd: {e}");
+                return;
+            }
+        };
+        match child.wait().await {
+            Ok(s) => {
+                if s.success() {
+                    log::info!("{cmd} exited successfully");
+                } else {
+                    log::warn!("{cmd} exited with {s}");
+                }
+            }
+            Err(e) => log::warn!("{cmd}: {e}"),
+        }
+    });
+}

src/server/emulation_task.rs

@@ -0,0 +1,323 @@
+use std::net::SocketAddr;
+
+use tokio::{
+    sync::mpsc::{Receiver, Sender},
+    task::JoinHandle,
+};
+
+use crate::{
+    client::{ClientHandle, ClientManager},
+    frontend::Status,
+    server::State,
+};
+use input_emulation::{self, EmulationError, EmulationHandle, InputEmulation, InputEmulationError};
+use input_event::{Event, KeyboardEvent};
+
+use super::{network_task::NetworkError, CaptureEvent, Server};
+
+#[derive(Clone, Debug)]
+pub(crate) enum EmulationEvent {
+    /// create a new client
+    Create(EmulationHandle),
+    /// destroy a client
+    Destroy(EmulationHandle),
+    /// input emulation must release keys for client
+    ReleaseKeys(ClientHandle),
+}
+
+pub(crate) fn new(
+    server: Server,
+    emulation_rx: Receiver<EmulationEvent>,
+    udp_rx: Receiver<Result<(Event, SocketAddr), NetworkError>>,
+    sender_tx: Sender<(Event, SocketAddr)>,
+    capture_tx: Sender<CaptureEvent>,
+) -> JoinHandle<()> {
+    let emulation_task = emulation_task(server, emulation_rx, udp_rx, sender_tx, capture_tx);
+    tokio::task::spawn_local(emulation_task)
+}
+
+async fn emulation_task(
+    server: Server,
+    mut rx: Receiver<EmulationEvent>,
+    mut udp_rx: Receiver<Result<(Event, SocketAddr), NetworkError>>,
+    sender_tx: Sender<(Event, SocketAddr)>,
+    capture_tx: Sender<CaptureEvent>,
+) {
+    loop {
+        if let Err(e) = do_emulation(&server, &mut rx, &mut udp_rx, &sender_tx, &capture_tx).await {
+            log::warn!("input emulation exited: {e}");
+        }
+        server.set_emulation_status(Status::Disabled);
+        if server.is_cancelled() {
+            break;
+        }
+
+        // allow cancellation
+        loop {
+            tokio::select! {
+                _ = rx.recv() => continue, /* need to ignore requests here! */
+                _ = server.emulation_notified() => break,
+                _ = server.cancelled() => return,
+            }
+        }
+    }
+}
+
+async fn do_emulation(
+    server: &Server,
+    rx: &mut Receiver<EmulationEvent>,
+    udp_rx: &mut Receiver<Result<(Event, SocketAddr), NetworkError>>,
+    sender_tx: &Sender<(Event, SocketAddr)>,
+    capture_tx: &Sender<CaptureEvent>,
+) -> Result<(), InputEmulationError> {
+    let backend = server.config.emulation_backend.map(|b| b.into());
+    log::info!("creating input emulation...");
+    let mut emulation = tokio::select! {
+        r = input_emulation::create(backend) => {
+            r?
+        }
+        _ = server.cancelled() => return Ok(()),
+    };
+
+    server.set_emulation_status(Status::Enabled);
+
+    // add clients
+    for handle in server.active_clients() {
+        emulation.create(handle).await;
+    }
+
+    let res = do_emulation_session(server, &mut emulation, rx, udp_rx, sender_tx, capture_tx).await;
+
+    // release potentially still pressed keys
+    release_all_keys(server, &mut emulation).await?;
+
+    emulation.terminate().await;
+    res?;
+
+    Ok(())
+}
+
+async fn do_emulation_session(
+    server: &Server,
+    emulation: &mut Box<dyn InputEmulation>,
+    rx: &mut Receiver<EmulationEvent>,
+    udp_rx: &mut Receiver<Result<(Event, SocketAddr), NetworkError>>,
+    sender_tx: &Sender<(Event, SocketAddr)>,
+    capture_tx: &Sender<CaptureEvent>,
+) -> Result<(), InputEmulationError> {
+    let mut last_ignored = None;
+
+    loop {
+        tokio::select! {
+            udp_event = udp_rx.recv() => {
+                let udp_event = match udp_event.expect("channel closed") {
+                    Ok(e) => e,
+                    Err(e) => {
+                        log::warn!("network error: {e}");
+                        continue;
+                    }
+                };
+                handle_udp_rx(server, capture_tx, emulation, sender_tx, &mut last_ignored, udp_event).await?;
+            }
+            emulate_event = rx.recv() => {
+                match emulate_event.expect("channel closed") {
+                    EmulationEvent::Create(h) => emulation.create(h).await,
+                    EmulationEvent::Destroy(h) => emulation.destroy(h).await,
+                    EmulationEvent::ReleaseKeys(c) => release_keys(server, emulation, c).await?,
+                }
+            }
+            _ = server.notifies.cancel.cancelled() => break Ok(()),
+        }
+    }
+}
+
+async fn handle_udp_rx(
+    server: &Server,
+    capture_tx: &Sender<CaptureEvent>,
+    emulate: &mut Box<dyn InputEmulation>,
+    sender_tx: &Sender<(Event, SocketAddr)>,
+    last_ignored: &mut Option<SocketAddr>,
+    event: (Event, SocketAddr),
+) -> Result<(), EmulationError> {
+    let (event, addr) = event;
+
+    log::trace!("{:20} <-<-<-<------ {addr}", event.to_string());
+
+    // get client handle for addr
+    let Some(handle) =
+        activate_client_if_exists(&mut server.client_manager.borrow_mut(), addr, last_ignored)
+    else {
+        return Ok(());
+    };
+
+    match (event, addr) {
+        (Event::Pong(), _) => { /* ignore pong events */ }
+        (Event::Ping(), addr) => {
+            let _ = sender_tx.send((Event::Pong(), addr)).await;
+        }
+        (Event::Disconnect(), _) => {
+            release_keys(server, emulate, handle).await?;
+        }
+        (event, addr) => {
+            // tell clients that we are ready to receive events
+            if let Event::Enter() = event {
+                let _ = sender_tx.send((Event::Leave(), addr)).await;
+            }
+
+            match server.state.get() {
+                State::Sending => {
+                    if let Event::Leave() = event {
+                        // ignore additional leave events that may
+                        // have been sent for redundancy
+                    } else {
+                        // upon receiving any event, we go back to receiving mode
+                        server.state.replace(State::Receiving);
+                        let _ = capture_tx.send(CaptureEvent::Release).await;
+                        log::trace!("STATE ===> Receiving");
+                    }
+                }
+                State::Receiving => {
+                    let ignore_event =
+                        if let Event::Keyboard(KeyboardEvent::Key { key, state, .. }) = event {
+                            let (ignore_event, restart_timer) = update_client_keys(
+                                &mut server.client_manager.borrow_mut(),
+                                handle,
+                                key,
+                                state,
+                            );
+                            // restart timer if necessary
+                            if restart_timer {
+                                server.restart_ping_timer();
+                            }
+                            ignore_event
+                        } else {
+                            false
+                        };
+                    // workaround buggy rdp backend.
+                    if !ignore_event {
+                        // consume event
+                        emulate.consume(event, handle).await?;
+                        log::trace!("{event} => emulate");
+                    }
+                }
+                State::AwaitingLeave => {
+                    // we just entered the deadzone of a client, so
+                    // we need to ignore events that may still
+                    // be on the way until a leave event occurs
+                    // telling us the client registered the enter
+                    if let Event::Leave() = event {
+                        server.state.replace(State::Sending);
+                        log::trace!("STATE ===> Sending");
+                    }
+
+                    // entering a client that is waiting for a leave
+                    // event should still be possible
+                    if let Event::Enter() = event {
+                        server.state.replace(State::Receiving);
+                        let _ = capture_tx.send(CaptureEvent::Release).await;
+                        log::trace!("STATE ===> Receiving");
+                    }
+                }
+            }
+        }
+    }
+    Ok(())
+}
+
+async fn release_all_keys(
+    server: &Server,
+    emulation: &mut Box<dyn InputEmulation>,
+) -> Result<(), EmulationError> {
+    let clients = server
+        .client_manager
+        .borrow()
+        .get_client_states()
+        .map(|(h, _)| h)
+        .collect::<Vec<_>>();
+    for client in clients {
+        release_keys(server, emulation, client).await?;
+    }
+    Ok(())
+}
+
+async fn release_keys(
+    server: &Server,
+    emulate: &mut Box<dyn InputEmulation>,
+    client: ClientHandle,
+) -> Result<(), EmulationError> {
+    let keys = server
+        .client_manager
+        .borrow_mut()
+        .get_mut(client)
+        .iter_mut()
+        .flat_map(|(_, s)| s.pressed_keys.drain())
+        .collect::<Vec<_>>();
+
+    for key in keys {
+        let event = Event::Keyboard(KeyboardEvent::Key {
+            time: 0,
+            key,
+            state: 0,
+        });
+        emulate.consume(event, client).await?;
+        if let Ok(key) = input_event::scancode::Linux::try_from(key) {
+            log::warn!("releasing stuck key: {key:?}");
+        }
+    }
+
+    let event = Event::Keyboard(KeyboardEvent::Modifiers {
+        mods_depressed: 0,
+        mods_latched: 0,
+        mods_locked: 0,
+        group: 0,
+    });
+    emulate.consume(event, client).await?;
+    Ok(())
+}
+
+fn activate_client_if_exists(
+    client_manager: &mut ClientManager,
+    addr: SocketAddr,
+    last_ignored: &mut Option<SocketAddr>,
+) -> Option<ClientHandle> {
+    let Some(handle) = client_manager.get_client(addr) else {
+        // log ignored if it is the first event from the client in a series
+        if last_ignored.is_none() || last_ignored.is_some() && last_ignored.unwrap() != addr {
+            log::warn!("ignoring events from client {addr}");
+            last_ignored.replace(addr);
+        }
+        return None;
+    };
+    // next event can be logged as ignored again
+    last_ignored.take();
+
+    let (_, client_state) = client_manager.get_mut(handle)?;
+
+    // reset ttl for client
+    client_state.alive = true;
+    // set addr as new default for this client
+    client_state.active_addr = Some(addr);
+    Some(handle)
+}
+
+fn update_client_keys(
+    client_manager: &mut ClientManager,
+    handle: ClientHandle,
+    key: u32,
+    state: u8,
+) -> (bool, bool) {
+    let Some(client_state) = client_manager.get_mut(handle).map(|(_, s)| s) else {
+        return (true, false);
+    };
+
+    // ignore double press / release events
+    let ignore_event = if state == 0 {
+        // ignore release event if key not pressed
+        !client_state.pressed_keys.remove(&key)
+    } else {
+        // ignore press event if key not released
+        !client_state.pressed_keys.insert(key)
+    };
+    let restart_timer = !client_state.pressed_keys.is_empty();
+    (ignore_event, restart_timer)
+}

src/server/network_task.rs

@@ -0,0 +1,102 @@
+use std::{io, net::SocketAddr};
+
+use thiserror::Error;
+use tokio::{
+    net::UdpSocket,
+    sync::mpsc::{Receiver, Sender},
+    task::JoinHandle,
+};
+
+use input_event::{Event, ProtocolError};
+
+use super::Server;
+
+pub(crate) async fn new(
+    server: Server,
+    udp_recv_tx: Sender<Result<(Event, SocketAddr), NetworkError>>,
+    udp_send_rx: Receiver<(Event, SocketAddr)>,
+) -> io::Result<JoinHandle<()>> {
+    // bind the udp socket
+    let listen_addr = SocketAddr::new("0.0.0.0".parse().unwrap(), server.port.get());
+    let mut socket = UdpSocket::bind(listen_addr).await?;
+
+    Ok(tokio::task::spawn_local(async move {
+        let mut sender_rx = udp_send_rx;
+        loop {
+            let udp_receiver = udp_receiver(&socket, &udp_recv_tx);
+            let udp_sender = udp_sender(&socket, &mut sender_rx);
+            tokio::select! {
+                _ = udp_receiver => break, /* channel closed */
+                _ = udp_sender => break, /* channel closed */
+                _ = server.notifies.port_changed.notified() => update_port(&server, &mut socket).await,
+                _ = server.cancelled() => break, /* cancellation requested */
+            }
+        }
+    }))
+}
+
+async fn update_port(server: &Server, socket: &mut UdpSocket) {
+    let new_port = server.port.get();
+    let current_port = socket.local_addr().expect("socket not bound").port();
+
+    // if port is the same, we dont need to change it
+    if current_port == new_port {
+        return;
+    }
+
+    // bind new socket
+    let listen_addr = SocketAddr::new("0.0.0.0".parse().unwrap(), new_port);
+    let new_socket = UdpSocket::bind(listen_addr).await;
+    let err = match new_socket {
+        Ok(new_socket) => {
+            *socket = new_socket;
+            None
+        }
+        Err(e) => Some(e.to_string()),
+    };
+
+    // notify frontend of the actual port
+    let port = socket.local_addr().expect("socket not bound").port();
+    server.notify_port_changed(port, err);
+}
+
+async fn udp_receiver(
+    socket: &UdpSocket,
+    receiver_tx: &Sender<Result<(Event, SocketAddr), NetworkError>>,
+) {
+    loop {
+        let event = receive_event(socket).await;
+        receiver_tx.send(event).await.expect("channel closed");
+    }
+}
+
+async fn udp_sender(socket: &UdpSocket, rx: &mut Receiver<(Event, SocketAddr)>) {
+    loop {
+        let (event, addr) = rx.recv().await.expect("channel closed");
+        if let Err(e) = send_event(socket, event, addr) {
+            log::warn!("udp send failed: {e}");
+        };
+    }
+}
+
+#[derive(Debug, Error)]
+pub(crate) enum NetworkError {
+    #[error(transparent)]
+    Protocol(#[from] ProtocolError),
+    #[error("network error: `{0}`")]
+    Io(#[from] io::Error),
+}
+
+async fn receive_event(socket: &UdpSocket) -> Result<(Event, SocketAddr), NetworkError> {
+    let mut buf = vec![0u8; 22];
+    let (_amt, src) = socket.recv_from(&mut buf).await?;
+    Ok((Event::try_from(buf)?, src))
+}
+
+fn send_event(sock: &UdpSocket, e: Event, addr: SocketAddr) -> Result<usize, NetworkError> {
+    log::trace!("{:20} ------>->->-> {addr}", e.to_string());
+    let data: Vec<u8> = (&e).into();
+    // When udp blocks, we dont want to block the event loop.
+    // Dropping events is better than potentially crashing the input capture.
+    Ok(sock.try_send_to(&data, addr)?)
+}

src/server/ping_task.rs

@@ -0,0 +1,138 @@
+use std::{net::SocketAddr, time::Duration};
+
+use tokio::{sync::mpsc::Sender, task::JoinHandle};
+
+use input_event::Event;
+
+use crate::client::ClientHandle;
+
+use super::{capture_task::CaptureEvent, emulation_task::EmulationEvent, Server, State};
+
+const MAX_RESPONSE_TIME: Duration = Duration::from_millis(500);
+
+pub(crate) fn new(
+    server: Server,
+    sender_ch: Sender<(Event, SocketAddr)>,
+    emulate_notify: Sender<EmulationEvent>,
+    capture_notify: Sender<CaptureEvent>,
+) -> JoinHandle<()> {
+    // timer task
+    tokio::task::spawn_local(async move {
+        tokio::select! {
+            _ = server.notifies.cancel.cancelled() => {}
+            _ = ping_task(&server, sender_ch, emulate_notify, capture_notify) => {}
+        }
+    })
+}
+
+async fn ping_task(
+    server: &Server,
+    sender_ch: Sender<(Event, SocketAddr)>,
+    emulate_notify: Sender<EmulationEvent>,
+    capture_notify: Sender<CaptureEvent>,
+) {
+    loop {
+        // wait for wake up signal
+        server.ping_timer_notified().await;
+        loop {
+            let receiving = server.state.get() == State::Receiving;
+            let (ping_clients, ping_addrs) = {
+                let mut client_manager = server.client_manager.borrow_mut();
+
+                let ping_clients: Vec<ClientHandle> = if receiving {
+                    // if receiving we care about clients with pressed keys
+                    client_manager
+                        .get_client_states_mut()
+                        .filter(|(_, (_, s))| !s.pressed_keys.is_empty())
+                        .map(|(h, _)| h)
+                        .collect()
+                } else {
+                    // if sending we care about the active client
+                    server.active_client.get().iter().cloned().collect()
+                };
+
+                // get relevant socket addrs for clients
+                let ping_addrs: Vec<SocketAddr> = {
+                    ping_clients
+                        .iter()
+                        .flat_map(|&h| client_manager.get(h))
+                        .flat_map(|(c, s)| {
+                            if s.alive && s.active_addr.is_some() {
+                                vec![s.active_addr.unwrap()]
+                            } else {
+                                s.ips
+                                    .iter()
+                                    .cloned()
+                                    .map(|ip| SocketAddr::new(ip, c.port))
+                                    .collect()
+                            }
+                        })
+                        .collect()
+                };
+
+                // reset alive
+                for (_, (_, s)) in client_manager.get_client_states_mut() {
+                    s.alive = false;
+                }
+
+                (ping_clients, ping_addrs)
+            };
+
+            if receiving && ping_clients.is_empty() {
+                // receiving and no client has pressed keys
+                // -> no need to keep pinging
+                break;
+            }
+
+            // ping clients
+            for addr in ping_addrs {
+                if sender_ch.send((Event::Ping(), addr)).await.is_err() {
+                    break;
+                }
+            }
+
+            // give clients time to resond
+            if receiving {
+                log::trace!(
+                    "waiting {MAX_RESPONSE_TIME:?} for response from client with pressed keys ..."
+                );
+            } else {
+                log::trace!(
+                    "state: {:?} => waiting {MAX_RESPONSE_TIME:?} for client to respond ...",
+                    server.state.get()
+                );
+            }
+
+            tokio::time::sleep(MAX_RESPONSE_TIME).await;
+
+            // when anything is received from a client,
+            // the alive flag gets set
+            let unresponsive_clients: Vec<_> = {
+                let client_manager = server.client_manager.borrow();
+                ping_clients
+                    .iter()
+                    .filter_map(|&h| match client_manager.get(h) {
+                        Some((_, s)) if !s.alive => Some(h),
+                        _ => None,
+                    })
+                    .collect()
+            };
+
+            // we may not be receiving anymore but we should respond
+            // to the original state and not the "new" one
+            if receiving {
+                for h in unresponsive_clients {
+                    log::warn!("device not responding, releasing keys!");
+                    let _ = emulate_notify.send(EmulationEvent::ReleaseKeys(h)).await;
+                }
+            } else {
+                // release pointer if the active client has not responded
+                if !unresponsive_clients.is_empty() {
+                    log::warn!("client not responding, releasing pointer!");
+                    server.state.replace(State::Receiving);
+                    let _ = capture_notify.send(CaptureEvent::Release).await;
+                }
+            }
+        }
+    }
+}