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net: don't do DNS for onion and local addresses

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Fixes #13705

Change-Id: I86c60c78ce0394f830f904c9cba83ebbf3efc046
Reviewed-on: https://go-review.googlesource.com/21328
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Brad Fitzpatrick 2016-03-30 23:08:44 -07:00
parent 0d40dfa745
commit 72c1180852
2 changed files with 68 additions and 0 deletions
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17
src/net/dnsclient_unix.go
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@ -319,8 +319,25 @@ func lookup(name string, qtype uint16) (cname string, rrs []dnsRR, err error) {
return
}
// 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.
func avoidDNS(name string) bool {
if name == "" {
return true
}
if name[len(name)-1] == '.' {
name = name[:len(name)-1]
}
return stringsHasSuffixFold(name, ".onion") || stringsHasSuffixFold(name, ".local")
}
// nameList returns a list of names for sequential DNS queries.
func (conf *dnsConfig) nameList(name string) []string {
if avoidDNS(name) {
return nil
}
// If name is rooted (trailing dot), try only that name.
rooted := len(name) > 0 && name[len(name)-1] == '.'
if rooted {