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 ChannelWin : public Channel,
  25                    public internal::ChannelReader,
  26                    public base::MessageLoopForIO::IOHandler {
  27  public:
  28   // Mirror methods of Channel, see ipc_channel.h for description.
  29   ChannelWin(const IPC::ChannelHandle &channel_handle, Mode mode,
  30              Listener* listener);
  31   ~ChannelWin();
  32
  33   // Channel implementation
  34   virtual bool Connect() OVERRIDE;
  35   virtual void Close() OVERRIDE;
  36   virtual bool Send(Message* message) OVERRIDE;
  37   virtual base::ProcessId GetPeerPID() const OVERRIDE;
  38
  39   static bool IsNamedServerInitialized(const std::string& channel_id);
  40
  41
  42  private:
  43   // ChannelReader implementation.
  44   virtual ReadState ReadData(char* buffer,
  45                              int buffer_len,
  46                              int* bytes_read) OVERRIDE;
  47   virtual bool WillDispatchInputMessage(Message* msg) OVERRIDE;
  48   bool DidEmptyInputBuffers() OVERRIDE;
  49   virtual void HandleInternalMessage(const Message& msg) OVERRIDE;
  50
  51   static const base::string16 PipeName(const std::string& channel_id,
  52                                        int32* secret);
  53   bool CreatePipe(const IPC::ChannelHandle &channel_handle, Mode mode);
  54
  55   bool ProcessConnection();
  56   bool ProcessOutgoingMessages(base::MessageLoopForIO::IOContext* context,
  57                                DWORD bytes_written);
  58
  59   // MessageLoop::IOHandler implementation.
  60   virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
  61                              DWORD bytes_transfered,
  62                              DWORD error);
  63
  64  private:
  65   struct State {
  66     explicit State(ChannelWin* channel);
  67     ~State();
  68     base::MessageLoopForIO::IOContext context;
  69     bool is_pending;
  70   };
  71
  72   State input_state_;
  73   State output_state_;
  74
  75   HANDLE pipe_;
  76
  77   base::ProcessId peer_pid_;
  78
  79   // Messages to be sent are queued here.
  80   std::queue<Message*> output_queue_;
  81
  82   // In server-mode, we have to wait for the client to connect before we
  83   // can begin reading.  We make use of the input_state_ when performing
  84   // the connect operation in overlapped mode.
  85   bool waiting_connect_;
  86
  87   // This flag is set when processing incoming messages.  It is used to
  88   // avoid recursing through ProcessIncomingMessages, which could cause
  89   // problems.  TODO(darin): make this unnecessary
  90   bool processing_incoming_;
  91
  92   // Determines if we should validate a client's secret on connection.
  93   bool validate_client_;
  94
  95   // Tracks the lifetime of this object, for debugging purposes.
  96   int32 debug_flags_;
  97
  98   // This is a unique per-channel value used to authenticate the client end of
  99   // a connection. If the value is non-zero, the client passes it in the hello
 100   // and the host validates. (We don't send the zero value fto preserve IPC
 101   // compatability with existing clients that don't validate the channel.)
 102   int32 client_secret_;
 103
 104
 105   base::WeakPtrFactory<ChannelWin> weak_factory_;
 106
 107   scoped_ptr<base::ThreadChecker> thread_check_;
 108
 109   DISALLOW_COPY_AND_ASSIGN(ChannelWin);
 110 };
 111
 112 }  // namespace IPC
 113
 114 #endif  // IPC_IPC_CHANNEL_WIN_H_