net: fix LookupCNAME on Plan 9

Looking up a nonexistent CNAME record on an existing domain on Plan 9 can return either a "dns failure" error or a "resource does not exist" error. Fixes golang#21335. Change-Id: Iead8ed4fe3167db06adb4ab7797c52c7efc3ff89 Reviewed-on: https://go-review.googlesource.com/53670 Run-TryBot: David du Colombier <[email protected]> TryBot-Result: Gobot Gobot <[email protected]> Reviewed-by: Brad Fitzpatrick <[email protected]> Reviewed-by: Avelino <[email protected]>
robertodauria · Aug 8, 2017 · bd3dc9d · bd3dc9d
1 parent e0e7c03
commit bd3dc9d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/net/lookup_plan9.go b/src/net/lookup_plan9.go
@@ -198,7 +198,7 @@ func (*Resolver) lookupPort(ctx context.Context, network, service string) (port
 func (*Resolver) lookupCNAME(ctx context.Context, name string) (cname string, err error) {
 	lines, err := queryDNS(ctx, name, "cname")
 	if err != nil {
-		if stringsHasSuffix(err.Error(), "dns failure") {
+		if stringsHasSuffix(err.Error(), "dns failure") || stringsHasSuffix(err.Error(), "resource does not exist; negrcode 0") {
 			cname = name + "."
 			err = nil
 		}