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// 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 IPC_IPC_CHANNEL_WIN_H_
#define IPC_IPC_CHANNEL_WIN_H_
#include "ipc/ipc_channel.h"
#include <queue>
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/win/scoped_handle.h"
#include "ipc/ipc_channel_reader.h"
namespace base {
class ThreadChecker;
}
namespace IPC {
class ChannelWin : public Channel,
public internal::ChannelReader,
public base::MessageLoopForIO::IOHandler {
public:
// Mirror methods of Channel, see ipc_channel.h for description.
// |broker| must outlive the newly created object.
ChannelWin(const IPC::ChannelHandle& channel_handle,
Mode mode,
Listener* listener,
AttachmentBroker* broker);
~ChannelWin() override;
// Channel implementation
bool Connect() override;
void Close() override;
bool Send(Message* message) override;
AttachmentBroker* GetAttachmentBroker() override;
base::ProcessId GetPeerPID() const override;
base::ProcessId GetSelfPID() const override;
static bool IsNamedServerInitialized(const std::string& channel_id);
private:
// ChannelReader implementation.
ReadState ReadData(char* buffer, int buffer_len, int* bytes_read) override;
bool ShouldDispatchInputMessage(Message* msg) override;
bool GetNonBrokeredAttachments(Message* msg) override;
bool DidEmptyInputBuffers() override;
void HandleInternalMessage(const Message& msg) override;
base::ProcessId GetSenderPID() override;
bool IsAttachmentBrokerEndpoint() override;
static const base::string16 PipeName(const std::string& channel_id,
int32* secret);
bool CreatePipe(const IPC::ChannelHandle &channel_handle, Mode mode);
bool ProcessConnection();
bool ProcessOutgoingMessages(base::MessageLoopForIO::IOContext* context,
DWORD bytes_written);
// Returns |false| on channel error.
// If |message| has brokerable attachments, those attachments are passed to
// the AttachmentBroker (which in turn invokes Send()), so this method must
// be re-entrant.
// Adds |message| to |output_queue_| and calls ProcessOutgoingMessages().
bool ProcessMessageForDelivery(Message* message);
// Moves all messages from |prelim_queue_| to |output_queue_| by calling
// ProcessMessageForDelivery().
void FlushPrelimQueue();
// MessageLoop::IOHandler implementation.
void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
DWORD bytes_transfered,
DWORD error) override;
private:
struct State {
explicit State(ChannelWin* channel);
~State();
base::MessageLoopForIO::IOContext context;
bool is_pending;
};
State input_state_;
State output_state_;
base::win::ScopedHandle pipe_;
base::ProcessId peer_pid_;
// Messages not yet ready to be sent are queued here. Messages removed from
// this queue are placed in the output_queue_. The double queue is
// unfortunate, but is necessary because messages with brokerable attachments
// can generate multiple messages to be sent (possibly from other channels).
// Some of these generated messages cannot be sent until |peer_pid_| has been
// configured.
// As soon as |peer_pid| has been configured, there is no longer any need for
// |prelim_queue_|. All messages are flushed, and no new messages are added.
std::queue<Message*> prelim_queue_;
// Messages to be sent are queued here.
std::queue<Message*> output_queue_;
// In server-mode, we have to wait for the client to connect before we
// can begin reading. We make use of the input_state_ when performing
// the connect operation in overlapped mode.
bool waiting_connect_;
// This flag is set when processing incoming messages. It is used to
// avoid recursing through ProcessIncomingMessages, which could cause
// problems. TODO(darin): make this unnecessary
bool processing_incoming_;
// Determines if we should validate a client's secret on connection.
bool validate_client_;
// Tracks the lifetime of this object, for debugging purposes.
uint32 debug_flags_;
// This is a unique per-channel value used to authenticate the client end of
// a connection. If the value is non-zero, the client passes it in the hello
// and the host validates. (We don't send the zero value fto preserve IPC
// compatability with existing clients that don't validate the channel.)
int32 client_secret_;
scoped_ptr<base::ThreadChecker> thread_check_;
// |broker_| must outlive this instance.
AttachmentBroker* broker_;
base::WeakPtrFactory<ChannelWin> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ChannelWin);
};
} // namespace IPC
#endif // IPC_IPC_CHANNEL_WIN_H_
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