Merge 84251, 85083, 85188, 85375, 77501.

src/net/base/net_util.h

 // Copyright (c) 2010 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_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 392 matching lines @@
 // IP address whose |prefix_length_in_bits| most significant bits match
 // |ip_prefix| will be matched.
 //
 // In cases when an IPv4 address is being compared to an IPv6 address prefix
 // and vice versa, the IPv4 addresses will be converted to IPv4-mapped
 // (IPv6) addresses.
 bool IPNumberMatchesPrefix(const IPAddressNumber& ip_number,
                            const IPAddressNumber& ip_prefix,
                            size_t prefix_length_in_bits);
 
+// Makes a copy of |info|. The dynamically-allocated parts are copied as well.
+// If |recursive| is true, chained entries via ai_next are copied too.
+// The copy returned by this function should be freed using
+// FreeCopyOfAddrinfo(), and NOT freeaddrinfo().
+struct addrinfo* CreateCopyOfAddrinfo(const struct addrinfo* info,
+                                      bool recursive);
+
+// Frees an addrinfo that was created by CreateCopyOfAddrinfo().
+void FreeCopyOfAddrinfo(struct addrinfo* info);
+
 // Returns the port field of the sockaddr in |info|.
 const uint16* GetPortFieldFromAddrinfo(const struct addrinfo* info);
 uint16* GetPortFieldFromAddrinfo(struct addrinfo* info);
 
 // Returns the value of |info's| port (in host byte ordering).
 int GetPortFromAddrinfo(const struct addrinfo* info);
 
 // Same except for struct sockaddr.
 const uint16* GetPortFieldFromSockaddr(const struct sockaddr* address,
                                        socklen_t address_len);
 int GetPortFromSockaddr(const struct sockaddr* address,
                         socklen_t address_len);
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_H_