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// Copyright (c) 2006-2008 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_BASE_TCP_CLIENT_SOCKET_H_
#define NET_BASE_TCP_CLIENT_SOCKET_H_
#include "build/build_config.h"
#if defined(OS_WIN)
#include <ws2tcpip.h>
#include "base/object_watcher.h"
#elif defined(OS_POSIX)
struct event; // From libevent
#include <sys/socket.h> // for struct sockaddr
#define SOCKET int
#include "base/message_loop.h"
#endif
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "base/thread.h"
#include "base/waitable_event.h"
#include "net/base/address_list.h"
#include "net/base/client_socket.h"
#include "net/base/completion_callback.h"
#include "net/base/net_errors.h"
namespace net {
// A client socket that uses TCP as the transport layer.
//
// NOTE: The windows implementation supports half duplex only.
// Read and Write calls must not be in progress at the same time.
// The libevent implementation supports full duplex because that
// made it slightly easier to implement ssl.
class TCPClientSocket : public ClientSocket,
#if defined(OS_WIN)
public base::ObjectWatcher::Delegate
#elif defined(OS_POSIX)
public MessageLoopForIO::Watcher
#endif
{
public:
// The IP address(es) and port number to connect to. The TCP socket will try
// each IP address in the list until it succeeds in establishing a
// connection.
explicit TCPClientSocket(const AddressList& addresses);
~TCPClientSocket();
// ClientSocket methods:
virtual int Connect(CompletionCallback* callback);
virtual int ReconnectIgnoringLastError(CompletionCallback* callback);
virtual void Disconnect();
virtual bool IsConnected() const;
// Socket methods:
// Multiple outstanding requests are not supported.
// Full duplex mode (reading and writing at the same time) is not supported
// on Windows (but is supported on Linux and Mac for ease of implementation
// of SSLClientSocket)
virtual int Read(char* buf, int buf_len, CompletionCallback* callback);
virtual int Write(const char* buf, int buf_len, CompletionCallback* callback);
#if defined(OS_POSIX)
// Identical to posix system call of same name
// Needed by ssl_client_socket_nss
virtual int GetPeerName(struct sockaddr *name, socklen_t *namelen);
#endif
private:
SOCKET socket_;
// The list of addresses we should try in order to establish a connection.
AddressList addresses_;
// Where we are in above list, or NULL if all addrinfos have been tried.
const struct addrinfo* current_ai_;
#if defined(OS_WIN)
enum WaitState {
NOT_WAITING,
WAITING_CONNECT,
WAITING_READ,
WAITING_WRITE
};
WaitState wait_state_;
// base::ObjectWatcher::Delegate methods:
virtual void OnObjectSignaled(HANDLE object);
OVERLAPPED overlapped_;
WSABUF buffer_;
base::ObjectWatcher watcher_;
void DidCompleteIO();
#elif defined(OS_POSIX)
// Whether we're currently waiting for connect() to complete
bool waiting_connect_;
// The socket's libevent wrapper
MessageLoopForIO::FileDescriptorWatcher socket_watcher_;
// Called by MessagePumpLibevent when the socket is ready to do I/O
void OnFileCanReadWithoutBlocking(int fd);
void OnFileCanWriteWithoutBlocking(int fd);
// The buffer used by OnSocketReady to retry Read requests
char* buf_;
int buf_len_;
// The buffer used by OnSocketReady to retry Write requests
const char* write_buf_;
int write_buf_len_;
// External callback; called when write is complete.
CompletionCallback* write_callback_;
void DoWriteCallback(int rv);
void DidCompleteRead();
void DidCompleteWrite();
#endif
// External callback; called when read (and on Windows, write) is complete.
CompletionCallback* callback_;
int CreateSocket(const struct addrinfo* ai);
void DoCallback(int rv);
void DidCompleteConnect();
};
// Tiny helper class to do a synchronous connect,
// in lieu of directly supporting that in TcpClientSocket.
// This avoids cluttering the main codepath with code only used by unit tests.
// TODO(dkegel): move this to its own header file.
class TCPClientSocketSyncConnector
: public base::RefCounted<TCPClientSocketSyncConnector> {
public:
// Connect given socket synchronously.
// Returns network error code.
static int Connect(net::TCPClientSocket* sock) {
// Start up a throwaway IO thread just for this.
// TODO(port): use some existing thread pool instead?
base::Thread io_thread("SyncConnect");
base::Thread::Options options;
options.message_loop_type = MessageLoop::TYPE_IO;
io_thread.StartWithOptions(options);
// Post a request to do the connect on that thread.
scoped_refptr<TCPClientSocketSyncConnector> connector =
new TCPClientSocketSyncConnector(sock);
io_thread.message_loop()->PostTask(FROM_HERE, NewRunnableMethod(connector.get(),
&net::TCPClientSocketSyncConnector::DoConnect));
connector->Wait();
return connector->GetError();
}
private:
// Start a connect. Must be called on an IO thread.
void DoConnect() {
net_error_ = sock_->Connect(&connect_callback_);
if (net_error_ != ERR_IO_PENDING)
event_.Signal();
}
// Callback called on same IO thread when connection complete.
void ConnectDone(int rv) {
net_error_ = rv;
event_.Signal();
}
// Call this after posting a call to DoConnect().
void Wait() { event_.Wait(); }
// Call this after Wait() if you need the final error code from the connect.
int GetError() { return net_error_; }
// sock is owned by caller, but must remain valid while this object lives.
explicit TCPClientSocketSyncConnector(TCPClientSocket* sock) :
event_(false, false),
sock_(sock),
net_error_(0),
connect_callback_(this, &net::TCPClientSocketSyncConnector::ConnectDone) {
}
base::WaitableEvent event_;
net::TCPClientSocket* sock_;
int net_error_;
net::CompletionCallbackImpl<TCPClientSocketSyncConnector> connect_callback_;
DISALLOW_COPY_AND_ASSIGN(TCPClientSocketSyncConnector);
};
} // namespace net
#endif // NET_BASE_TCP_CLIENT_SOCKET_H_
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