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fix(dns): resolve hostnames via the OS resolver instead of pure DNS

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hickory_resolver's TokioResolver only consults /etc/resolv.conf and
queries upstream DNS servers — which means it can't see /etc/hosts,
mDNS (Avahi/Bonjour), NetBIOS, or anything else in the system's full
name-resolution stack. On a typical home LAN there's no DNS server
that knows about peer machine names, so users had to fall back to
typing IP addresses, which broke the moment they moved their setup
to a different network.

Swap to tokio::net::lookup_host, which calls getaddrinfo (or
GetAddrInfoEx on Windows). That walks /etc/nsswitch.conf on Linux
(picking up Avahi-resolved .local names, /etc/hosts, and DNS), uses
Bonjour for .local on macOS, and the full Windows resolver on
Windows. A Bonjour hostname like "JKMBP-M4-Max.local" now resolves
on every modern network without explicit configuration; the user
can carry their two machines between LANs and the connection still
finds them.

Drop the hickory-resolver dependency entirely — it's no longer
needed. ServiceError::Dns also goes away; lookup failures surface as
io::Error which is already covered by ServiceError::Io.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jon Kinney
2026-05-04 23:31:34 -05:00
committed by Ferdinand Schober
parent d68df35409
commit a42592ab05
4 changed files with 34 additions and 219 deletions
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217
Cargo.lock generated
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@@ -549,30 +549,6 @@ dependencies = [
"libc",
]
[[package]]
name = "critical-section"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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]
[[package]]
name = "crossbeam-utils"
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@@ -586,7 +562,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
dependencies = [
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"rand_core 0.6.4",
"rand_core",
"subtle",
"zeroize",
]
@@ -598,7 +574,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"rand_core 0.6.4",
"rand_core",
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]
@@ -735,7 +711,7 @@ dependencies = [
"hkdf",
"pem-rfc7468",
"pkcs8",
"rand_core 0.6.4",
"rand_core",
"sec1",
"subtle",
"zeroize",
@@ -747,18 +723,6 @@ version = "1.1.1"
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[[package]]
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dependencies = [
"heck",
"proc-macro2",
"quote",
"syn",
]
[[package]]
name = "enumflags2"
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@@ -852,7 +816,7 @@ version = "0.13.1"
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dependencies = [
"rand_core 0.6.4",
"rand_core",
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]
@@ -1281,7 +1245,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
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"ff",
"rand_core 0.6.4",
"rand_core",
"subtle",
]
@@ -1395,52 +1359,6 @@ version = "0.4.3"
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[[package]]
name = "hickory-proto"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"cfg-if",
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"ipnet",
"once_cell",
"rand 0.9.2",
"ring",
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"tinyvec",
"tokio",
"tracing",
"url",
]
[[package]]
name = "hickory-resolver"
version = "0.25.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"smallvec",
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"tokio",
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]
[[package]]
name = "hkdf"
version = "0.12.4"
@@ -1713,19 +1631,6 @@ dependencies = [
"thiserror 2.0.18",
]
[[package]]
name = "ipconfig"
version = "0.3.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4d40460c0ce33d6ce4b0630ad68ff63d6661961c48b6dba35e5a4d81cfb48222"
dependencies = [
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"windows-result 0.4.1",
"windows-sys 0.61.2",
]
[[package]]
name = "ipnet"
version = "2.12.0"
@@ -1845,7 +1750,6 @@ dependencies = [
"clap",
"env_logger",
"futures",
"hickory-resolver",
"input-capture",
"input-emulation",
"input-event",
@@ -2096,23 +2000,6 @@ dependencies = [
"windows-sys 0.61.2",
]
[[package]]
name = "moka"
version = "0.12.15"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "957228ad12042ee839f93c8f257b62b4c0ab5eaae1d4fa60de53b27c9d7c5046"
dependencies = [
"crossbeam-channel",
"crossbeam-epoch",
"crossbeam-utils",
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]
[[package]]
name = "nix"
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@@ -2242,10 +2129,6 @@ name = "once_cell"
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dependencies = [
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"portable-atomic",
]
[[package]]
name = "once_cell_polyfill"
@@ -2530,18 +2413,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"rand_core 0.6.4",
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[[package]]
name = "rand"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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"rand_chacha",
"rand_core",
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[[package]]
@@ -2551,17 +2424,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
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name = "rand_chacha"
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checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
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"rand_core 0.9.5",
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[[package]]
@@ -2573,15 +2436,6 @@ dependencies = [
"getrandom 0.2.17",
]
[[package]]
name = "rand_core"
version = "0.9.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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[[package]]
name = "rcgen"
version = "0.13.2"
@@ -2644,12 +2498,6 @@ dependencies = [
"tokio",
]
[[package]]
name = "resolv-conf"
version = "0.7.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e061d1b48cb8d38042de4ae0a7a6401009d6143dc80d2e2d6f31f0bdd6470c7"
[[package]]
name = "rfc6979"
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@@ -2929,7 +2777,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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"rand_core",
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[[package]]
@@ -3017,12 +2865,6 @@ dependencies = [
"version-compare",
]
[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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@@ -3125,21 +2967,6 @@ dependencies = [
"zerovec",
]
[[package]]
name = "tinyvec"
version = "1.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3e61e67053d25a4e82c844e8424039d9745781b3fc4f32b8d55ed50f5f667ef3"
dependencies = [
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[[package]]
name = "tinyvec_macros"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "tokio"
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@@ -3417,7 +3244,6 @@ version = "1.23.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -3658,8 +3484,8 @@ dependencies = [
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"pem",
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"rand 0.8.5",
"rand_core 0.6.4",
"rand",
"rand_core",
"rcgen",
"ring",
"rustls",
@@ -3690,18 +3516,12 @@ dependencies = [
"log",
"nix",
"portable-atomic",
"rand 0.8.5",
"rand",
"thiserror 1.0.69",
"tokio",
"winapi",
]
[[package]]
name = "widestring"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "winapi"
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@@ -3836,17 +3656,6 @@ dependencies = [
"windows-link 0.1.3",
]
[[package]]
name = "windows-registry"
version = "0.6.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "windows-result"
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@@ -4186,7 +3995,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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