Always treat .localhost as loopback

net/base/net_util_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/net_util.h"
 
 #include <string.h>
 
 #include <ostream>
 
@@ skipping 776 matching lines @@
   EXPECT_TRUE(net::IsLocalhost("localhost6"));
   EXPECT_TRUE(net::IsLocalhost("localhost6.localdomain6"));
   EXPECT_TRUE(net::IsLocalhost("127.0.0.1"));
   EXPECT_TRUE(net::IsLocalhost("127.0.1.0"));
   EXPECT_TRUE(net::IsLocalhost("127.1.0.0"));
   EXPECT_TRUE(net::IsLocalhost("127.0.0.255"));
   EXPECT_TRUE(net::IsLocalhost("127.0.255.0"));
   EXPECT_TRUE(net::IsLocalhost("127.255.0.0"));
   EXPECT_TRUE(net::IsLocalhost("::1"));
   EXPECT_TRUE(net::IsLocalhost("0:0:0:0:0:0:0:1"));
+  EXPECT_TRUE(net::IsLocalhost("foo.localhost"));
 
   EXPECT_FALSE(net::IsLocalhost("localhostx"));
   EXPECT_FALSE(net::IsLocalhost("foo.localdomain"));
   EXPECT_FALSE(net::IsLocalhost("localhost6x"));
   EXPECT_FALSE(net::IsLocalhost("localhost.localdomain6"));
   EXPECT_FALSE(net::IsLocalhost("localhost6.localdomain"));
   EXPECT_FALSE(net::IsLocalhost("127.0.0.1.1"));
   EXPECT_FALSE(net::IsLocalhost(".127.0.0.255"));
   EXPECT_FALSE(net::IsLocalhost("::2"));
   EXPECT_FALSE(net::IsLocalhost("::1:1"));
   EXPECT_FALSE(net::IsLocalhost("0:0:0:0:1:0:0:1"));
   EXPECT_FALSE(net::IsLocalhost("::1:1"));
   EXPECT_FALSE(net::IsLocalhost("0:0:0:0:0:0:0:0:1"));
+  EXPECT_FALSE(net::IsLocalhost("foo.localhost.com"));
+}
+
+TEST(NetUtilTest, IsLocalhostTLD) {
+  EXPECT_TRUE(net::IsLocalhostTLD("foo.localhost"));
+  EXPECT_FALSE(net::IsLocalhostTLD("foo.localhos"));

[Ryan Sleevi, 2015/02/19 22:24:56]

Add for the .suffix case

foo.localhost.

[estark, 2015/02/20 01:55:19]

Done.

+  EXPECT_FALSE(net::IsLocalhostTLD("foo.localhost.com"));
 }
 
 // Verify GetNetworkList().
 TEST(NetUtilTest, GetNetworkList) {
   NetworkInterfaceList list;
   ASSERT_TRUE(GetNetworkList(&list, INCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES));
   for (NetworkInterfaceList::iterator it = list.begin();
        it != list.end(); ++it) {
     // Verify that the names are not empty.
     EXPECT_FALSE(it->name.empty());
@@ skipping 669 matching lines @@
 TEST_P(NetUtilNonUniqueNameTest, IsHostnameNonUnique) {
   const NonUniqueNameTestData& test_data = GetParam();
 
   EXPECT_EQ(test_data.is_unique, IsUnique(test_data.hostname));
 }
 
 INSTANTIATE_TEST_CASE_P(, NetUtilNonUniqueNameTest,
                         testing::ValuesIn(kNonUniqueNameTestData));
 
 }  // namespace net