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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef IPC_IPC_CHANNEL_WIN_H_
      6 #define IPC_IPC_CHANNEL_WIN_H_
      7 
      8 #include "ipc/ipc_channel.h"
      9 
     10 #include <queue>
     11 #include <string>
     12 
     13 #include "base/memory/scoped_ptr.h"
     14 #include "base/memory/weak_ptr.h"
     15 #include "base/message_loop/message_loop.h"
     16 #include "ipc/ipc_channel_reader.h"
     17 
     18 namespace base {
     19 class ThreadChecker;
     20 }
     21 
     22 namespace IPC {
     23 
     24 class Channel::ChannelImpl : public internal::ChannelReader,
     25                              public base::MessageLoopForIO::IOHandler {
     26  public:
     27   // Mirror methods of Channel, see ipc_channel.h for description.
     28   ChannelImpl(const IPC::ChannelHandle &channel_handle, Mode mode,
     29               Listener* listener);
     30   ~ChannelImpl();
     31   bool Connect();
     32   void Close();
     33   bool Send(Message* message);
     34   static bool IsNamedServerInitialized(const std::string& channel_id);
     35   base::ProcessId peer_pid() const { return peer_pid_; }
     36 
     37  private:
     38   // ChannelReader implementation.
     39   virtual ReadState ReadData(char* buffer,
     40                              int buffer_len,
     41                              int* bytes_read) OVERRIDE;
     42   virtual bool WillDispatchInputMessage(Message* msg) OVERRIDE;
     43   bool DidEmptyInputBuffers() OVERRIDE;
     44   virtual void HandleHelloMessage(const Message& msg) OVERRIDE;
     45 
     46   static const string16 PipeName(const std::string& channel_id,
     47                                  int32* secret);
     48   bool CreatePipe(const IPC::ChannelHandle &channel_handle, Mode mode);
     49 
     50   bool ProcessConnection();
     51   bool ProcessOutgoingMessages(base::MessageLoopForIO::IOContext* context,
     52                                DWORD bytes_written);
     53 
     54   // MessageLoop::IOHandler implementation.
     55   virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
     56                              DWORD bytes_transfered,
     57                              DWORD error);
     58 
     59  private:
     60   struct State {
     61     explicit State(ChannelImpl* channel);
     62     ~State();
     63     base::MessageLoopForIO::IOContext context;
     64     bool is_pending;
     65   };
     66 
     67   State input_state_;
     68   State output_state_;
     69 
     70   HANDLE pipe_;
     71 
     72   base::ProcessId peer_pid_;
     73 
     74   // Messages to be sent are queued here.
     75   std::queue<Message*> output_queue_;
     76 
     77   // In server-mode, we have to wait for the client to connect before we
     78   // can begin reading.  We make use of the input_state_ when performing
     79   // the connect operation in overlapped mode.
     80   bool waiting_connect_;
     81 
     82   // This flag is set when processing incoming messages.  It is used to
     83   // avoid recursing through ProcessIncomingMessages, which could cause
     84   // problems.  TODO(darin): make this unnecessary
     85   bool processing_incoming_;
     86 
     87   // Determines if we should validate a client's secret on connection.
     88   bool validate_client_;
     89 
     90   // This is a unique per-channel value used to authenticate the client end of
     91   // a connection. If the value is non-zero, the client passes it in the hello
     92   // and the host validates. (We don't send the zero value fto preserve IPC
     93   // compatability with existing clients that don't validate the channel.)
     94   int32 client_secret_;
     95 
     96 
     97   base::WeakPtrFactory<ChannelImpl> weak_factory_;
     98 
     99   scoped_ptr<base::ThreadChecker> thread_check_;
    100 
    101   DISALLOW_COPY_AND_ASSIGN(ChannelImpl);
    102 };
    103 
    104 }  // namespace IPC
    105 
    106 #endif  // IPC_IPC_CHANNEL_WIN_H_
    107