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net: don't avoid resolving .local addresses

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.local addresses are used by things like Kubernetes and Weave DNS; Go
should not avoid resolving them.

This is a partial revert of https://golang.org/cl/21328 which was too
strict of an interpretation of RFC 6762.

Fixes #16739

Change-Id: I349415b4eab5d61240dd18217bd95dc7d2105cd5
Reviewed-on: https://go-review.googlesource.com/27250
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Tom Wilkie 2016-08-17 10:13:03 +01:00 • committed by Brad Fitzpatrick
parent 73fdba2601
commit 289df4e6e6
2 changed files with 9 additions and 7 deletions
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7
src/net/dnsclient_unix.go
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@ -338,8 +338,9 @@ func lookup(ctx context.Context, name string, qtype uint16) (cname string, rrs [
}
// avoidDNS reports whether this is a hostname for which we should not
// use DNS. Currently this includes only .onion and .local names,
// per RFC 7686 and RFC 6762, respectively. See golang.org/issue/13705.
// use DNS. Currently this includes only .onion, per RFC 7686. See
// golang.org/issue/13705. Does not cover .local names (RFC 6762),
// see golang.org/issue/16739.
func avoidDNS(name string) bool {
if name == "" {
return true
@ -347,7 +348,7 @@ func avoidDNS(name string) bool {
if name[len(name)-1] == '.' {
name = name[:len(name)-1]
}
return stringsHasSuffixFold(name, ".onion") || stringsHasSuffixFold(name, ".local")
return stringsHasSuffixFold(name, ".onion")
}
// nameList returns a list of names for sequential DNS queries.