[net/dns] Resolve AF_UNSPEC on dual-stacked systems. Sort addresses according to RFC3484.

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 <algorithm>
 
@@ skipping 3031 matching lines @@
   EXPECT_TRUE(ParseIPLiteralToNumber("192.168.0.1", &ipv4_number));
 
   IPAddressNumber ipv6_number =
       ConvertIPv4NumberToIPv6Number(ipv4_number);
 
   // ::ffff:192.168.1.1
   EXPECT_EQ("0,0,0,0,0,0,0,0,0,0,255,255,192,168,0,1",
             DumpIPNumber(ipv6_number));
 }
 
+TEST(NetUtilTest, IsIPv4Mapped) {
+  IPAddressNumber ipv4_number;
+  EXPECT_TRUE(ParseIPLiteralToNumber("192.168.0.1", &ipv4_number));
+  EXPECT_FALSE(IsIPv4Mapped(ipv4_number));
+
+  IPAddressNumber ipv6_number;
+  EXPECT_TRUE(ParseIPLiteralToNumber("::1", &ipv4_number));
+  EXPECT_FALSE(IsIPv4Mapped(ipv6_number));
+
+  IPAddressNumber ipv4mapped_number;
+  EXPECT_TRUE(ParseIPLiteralToNumber("::ffff:0101:1", &ipv4mapped_number));
+  EXPECT_TRUE(IsIPv4Mapped(ipv4mapped_number));
+}
+
+TEST(NetUtilTest, ConvertIPv4MappedToIPv4) {
+  IPAddressNumber ipv4mapped_number;
+  EXPECT_TRUE(ParseIPLiteralToNumber("::ffff:0101:1", &ipv4mapped_number));
+  IPAddressNumber expected;
+  EXPECT_TRUE(ParseIPLiteralToNumber("1.1.0.1", &expected));
+  IPAddressNumber result = ConvertIPv4MappedToIPv4(ipv4mapped_number);
+  EXPECT_EQ(expected, result);
+}
+
 // Test parsing invalid CIDR notation literals.
 TEST(NetUtilTest, ParseCIDRBlock_Invalid) {
   const char* bad_literals[] = {
       "foobar",
       "",
       "192.168.0.1",
       "::1",
       "/",
       "/1",
       "1",
@@ skipping 156 matching lines @@
       if (it->address[i] != 0) {
         all_zeroes = false;
         break;
       }
     }
     EXPECT_FALSE(all_zeroes);
   }
 }
 
 }  // namespace net