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

net/base/net_util.h

 // 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.
 
 #ifndef NET_BASE_NET_UTIL_H_
 #define NET_BASE_NET_UTIL_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 406 matching lines @@
 // Parses an IP address literal (either IPv4 or IPv6) to its numeric value.
 // Returns true on success and fills |ip_number| with the numeric value.
 NET_EXPORT_PRIVATE bool ParseIPLiteralToNumber(const std::string& ip_literal,
                                                IPAddressNumber* ip_number);
 
 // Converts an IPv4 address to an IPv4-mapped IPv6 address.
 // For example 192.168.0.1 would be converted to ::ffff:192.168.0.1.
 NET_EXPORT_PRIVATE IPAddressNumber ConvertIPv4NumberToIPv6Number(
     const IPAddressNumber& ipv4_number);
 
+// Returns true iff |address| is an IPv4-mapped IPv6 address.
+NET_EXPORT_PRIVATE bool IsIPv4Mapped(const IPAddressNumber& address);
+
+// Converts an IPv4-mapped IPv6 address to IPv4 address. Should only be called
+// on IPv4-mapped IPv6 addresses.
+NET_EXPORT_PRIVATE IPAddressNumber ConvertIPv4MappedToIPv4(
+    const IPAddressNumber& address);
+
 // Parses an IP block specifier from CIDR notation to an
 // (IP address, prefix length) pair. Returns true on success and fills
 // |*ip_number| with the numeric value of the IP address and sets
 // |*prefix_length_in_bits| with the length of the prefix.
 //
 // CIDR notation literals can use either IPv4 or IPv6 literals. Some examples:
 //
 //    10.10.3.1/20
 //    a:b:c::/46
 //    ::1/128
@@ skipping 45 matching lines @@
 
 // Returns list of network interfaces except loopback interface. If an
 // interface has more than one address, a separate entry is added to
 // the list for each address.
 // Can be called only on a thread that allows IO.
 NET_EXPORT bool GetNetworkList(NetworkInterfaceList* networks);
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_H_