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net: expand nss myhostname fallback detection

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Expand myhostname fallback detection to properly detect the local
hostname in addition to other supported special names and suffixes.

Fixes #17967

Change-Id: I1fe141fd9838b25886c08b6f2fd325e58be60457
Reviewed-on: https://go-review.googlesource.com/33550
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Dan Peterson 2016-11-23 11:35:17 -07:00 • committed by Matthew Dempsky
parent c77e80df6c
commit 4bd95702dd
3 changed files with 102 additions and 60 deletions
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24
src/net/parse.go
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@ -334,15 +334,7 @@ func stringsHasSuffix(s, suffix string) bool {
// stringsHasSuffixFold reports whether s ends in suffix,
// ASCII-case-insensitively.
func stringsHasSuffixFold(s, suffix string) bool {
if len(suffix) > len(s) {
return false
}
for i := 0; i < len(suffix); i++ {
if lowerASCII(suffix[i]) != lowerASCII(s[len(s)-len(suffix)+i]) {
return false
}
}
return true
return len(s) >= len(suffix) && stringsEqualFold(s[len(s)-len(suffix):], suffix)
}
// stringsHasPrefix is strings.HasPrefix. It reports whether s begins with prefix.
@ -350,6 +342,20 @@ func stringsHasPrefix(s, prefix string) bool {
return len(s) >= len(prefix) && s[:len(prefix)] == prefix
}
// stringsEqualFold is strings.EqualFold, ASCII only. It reports whether s and t
// are equal, ASCII-case-insensitively.
func stringsEqualFold(s, t string) bool {
if len(s) != len(t) {
return false
}
for i := 0; i < len(s); i++ {
if lowerASCII(s[i]) != lowerASCII(t[i]) {
return false
}
}
return true
}
func readFull(r io.Reader) (all []byte, err error) {
buf := make([]byte, 1024)
for {