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net: ignore edns0 option in resolv.conf

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We use EDNS(0) by default. No need to fall back to netdns=cgo if we
see a explicit request for EDNS(0) in resolv.conf.

For #51153

Change-Id: I135363112e3de43ce877aad45aba71d1448068b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/415579
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
This commit is contained in:
Ian Lance Taylor 2022-06-30 22:06:26 -07:00 committed by Gopher Robot
parent 59865f1420
commit 7acbbbee94
1 changed files with 3 additions and 0 deletions
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3
src/net/dnsconfig_unix.go
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@ -109,6 +109,9 @@ func dnsReadConfig(filename string) *dnsConfig {
// https://www.freebsd.org/cgi/man.cgi?query=resolv.conf&sektion=5&manpath=freebsd-release-ports
// https://man.openbsd.org/resolv.conf.5
conf.useTCP = true
case s == "edns0":
// We use EDNS by default.
// Ignore this option.
default:
conf.unknownOpt = true
}