Add support for IPV6 in dns resolvers

core/pkg/net/net.go

@@ -0,0 +1,30 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package net
+
+import (
+	_net "net"
+	"strings"
+)
+
+// IsIPV6 checks if the input contains a valid IPV6 address
+func IsIPV6(ip _net.IP) bool {
+	if dp := strings.Index(ip.String(), ":"); dp != -1 {
+		return true
+	}
+	return false
+}