ipc/ipc_channel_win.h

   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 HandleInternalMessage(const Message& msg) OVERRIDE;
  45
  46   static const base::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_