Resolve RFC 6761 localhost names to loopback

net/base/net_util.cc

Index: net/base/net_util.cc
diff --git a/net/base/net_util.cc b/net/base/net_util.cc
index 028b56b74a8bb526b4e486bb1c328efda71005d4..97a7f854cb3933e2647127e49030bf04b5d853e5 100644
--- a/net/base/net_util.cc
+++ b/net/base/net_util.cc
@@ -730,10 +730,31 @@ int GetPortFromSockaddr(const struct sockaddr* address, socklen_t address_len) {
   return base::NetToHost16(*port_field);
 }
 
+bool IsLocalhostHostname(const std::string& host, bool* isLocalhost6) {
+  std::string lowercased_host = base::StringToLowerASCII(host);
+  if (lowercased_host == "localhost6" ||
+      lowercased_host == "localhost6.localdomain6" ||
+      lowercased_host == "localhost6." ||
+      lowercased_host == "localhost6.localdomain6.") {
+    *isLocalhost6 = true;
+    return true;
+  }
+
+  if (lowercased_host == "localhost" ||
+      lowercased_host == "localhost.localdomain" ||
+      lowercased_host == "localhost." ||
+      lowercased_host == "localhost.localdomain." ||
+      IsLocalhostTLD(lowercased_host)) {
+    *isLocalhost6 = false;
+    return true;
+  }
+
+  return false;
+}
+
 bool IsLocalhost(const std::string& host) {
-  if (host == "localhost" || host == "localhost.localdomain" ||
-      host == "localhost6" || host == "localhost6.localdomain6" ||
-      IsLocalhostTLD(host))
+  bool isIPv6;
+  if (IsLocalhostHostname(host, &isIPv6))
     return true;
 
   IPAddressNumber ip_number;