[net/dns] Handle TC bit on DNS response in DnsTransaction.

net/dns/dns_session.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_DNS_DNS_SESSION_H_
 #define NET_DNS_DNS_SESSION_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "net/base/net_export.h"
 #include "net/base/rand_callback.h"
 #include "net/dns/dns_config_service.h"
 #include "net/dns/dns_socket_pool.h"
-#include "net/udp/datagram_client_socket.h"
 
 namespace net {
 
 class ClientSocketFactory;
+class DatagramClientSocket;
 class NetLog;
+class StreamSocket;
 
 // Session parameters and state shared between DNS transactions.
 // Ref-counted so that DnsClient::Request can keep working in absence of
 // DnsClient. A DnsSession must be recreated when DnsConfig changes.
 class NET_EXPORT_PRIVATE DnsSession
     : NON_EXPORTED_BASE(public base::RefCounted<DnsSession>) {
  public:
   typedef base::Callback<int()> RandCallback;
 
   class NET_EXPORT_PRIVATE SocketLease {
    public:
     SocketLease(scoped_refptr<DnsSession> session,
                 unsigned server_index,
                 scoped_ptr<DatagramClientSocket> socket);
     ~SocketLease();
 
+    unsigned server_index() const { return server_index_; }
+
     DatagramClientSocket* socket() { return socket_.get(); }
 
    private:
     scoped_refptr<DnsSession> session_;
     unsigned server_index_;
     scoped_ptr<DatagramClientSocket> socket_;
 
     DISALLOW_COPY_AND_ASSIGN(SocketLease);
   };
 
@@ skipping 12 matching lines @@
   int NextFirstServerIndex();
 
   // Return the timeout for the next query.
   base::TimeDelta NextTimeout(int attempt);
 
   // Allocate a socket, already connected to the server address.
   // When the SocketLease is destroyed, the socket will be freed.
   scoped_ptr<SocketLease> AllocateSocket(unsigned server_index,
                                          const NetLog::Source& source);
 
+  // Creates a StreamSocket from the factory for a transaction over TCP. These
+  // sockets are not pooled.
+  scoped_ptr<StreamSocket> CreateTCPSocket(unsigned server_index,
+                                           const NetLog::Source& source);
+
  private:
   friend class base::RefCounted<DnsSession>;
   ~DnsSession();
 
   // Release a socket.
   void FreeSocket(unsigned server_index,
                   scoped_ptr<DatagramClientSocket> socket);
 
   const DnsConfig config_;
   scoped_ptr<DnsSocketPool> socket_pool_;
   RandCallback rand_callback_;
   NetLog* net_log_;
 
   // Current index into |config_.nameservers| to begin resolution with.
   int server_index_;
 
   // TODO(szym): Add current RTT estimate.
   // TODO(szym): Add TCP connection pool to support DNS over TCP.
 
   DISALLOW_COPY_AND_ASSIGN(DnsSession);
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_SESSION_H_