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Differential D55011

libc/resolv: Switch default to loopback address
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Authored by des on Jan 31 2026, 12:00 PM.
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kevans
Commits
rG6b0a4d67a952: libc/resolv: Switch default to loopback address
rGc137555c3f39: libc/resolv: Switch default to loopback address
rG1538284a5fdd: libc/resolv: Switch default to loopback address
Summary

If no resolver configuration was found, we would fall back to INADDR_ANY
and IN6ADDR_ANY. This made sense when it was first written thirty or
forty years ago but not today, especially since connecting to INADDR_ANY
or IN6ADDR_ANY is no longer supported. Switch to the loopback address
and simplify the code.

Note that (as the pre-existing comment in the code states) running
without a resolver configuration is not really supported. Still, if
we're going to have a hardcoded fallback, it might as well work.

PR: 291790
MFC after: 1 week

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rG FreeBSD src repository
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Buildable 70284
Build 67167: arc lint + arc unit

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PathSize
lib/
libc/
resolv/
67 lines

Diff 170847

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lib/libc/resolv/res_init.c

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