HostResolver supports optional CNAME lookups.

net/base/address_list.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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_ADDRESS_LIST_H_
 #define NET_BASE_ADDRESS_LIST_H_
 
+#include <string>
+
 #include "base/ref_counted.h"
 
 struct addrinfo;
 
 namespace net {
 
 // An AddressList object contains a linked list of addrinfo structures.  This
 // class is designed to be copied around by value.
 class AddressList {
  public:
@@ skipping 21 matching lines @@
   // Retrieves the port number of the first sockaddr in the list. (If SetPort()
   // was previously used on this list, then all the addresses will have this
   // same port number.)
   int GetPort() const;
 
   // Sets the address to match |src|, and have each sockaddr's port be |port|.
   // If |src| already has the desired port this operation is cheap (just adds
   // a reference to |src|'s data.) Otherwise we will make a copy.
   void SetFrom(const AddressList& src, int port);
 
+  // Gets the canonical name for the address.
+  // If the canonical name exists, |*canonical_name| is filled in with the
+  // value and true is returned. If it does not exist, |*canonical_name| is
+  // not altered and false is returned.
+  // |canonical_name| must be a non-null value.
+  bool GetCanonicalName(std::string* canonical_name) const;
+
   // Clears all data from this address list. This leaves the list in the same
   // empty state as when first constructed.
   void Reset();
 
   // Used by unit-tests to manually set the TCP socket address.
   static AddressList CreateIPv6Address(unsigned char data[16]);
 
   // Get access to the head of the addrinfo list.
   const struct addrinfo* head() const { return data_->head; }
 
@@ skipping 13 matching lines @@
   };
 
   explicit AddressList(Data* data) : data_(data) {}
 
   scoped_refptr<Data> data_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_LIST_H_