webrtc/talk/p2p/base/tcpport.cc

339 lines
12 KiB
C++

/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/p2p/base/tcpport.h"
#include "talk/p2p/base/common.h"
#include "webrtc/base/common.h"
#include "webrtc/base/logging.h"
namespace cricket {
TCPPort::TCPPort(rtc::Thread* thread,
rtc::PacketSocketFactory* factory,
rtc::Network* network, const rtc::IPAddress& ip,
int min_port, int max_port, const std::string& username,
const std::string& password, bool allow_listen)
: Port(thread, LOCAL_PORT_TYPE, factory, network, ip, min_port, max_port,
username, password),
incoming_only_(false),
allow_listen_(allow_listen),
socket_(NULL),
error_(0) {
// TODO(mallinath) - Set preference value as per RFC 6544.
// http://b/issue?id=7141794
}
bool TCPPort::Init() {
if (allow_listen_) {
// Treat failure to create or bind a TCP socket as fatal. This
// should never happen.
socket_ = socket_factory()->CreateServerTcpSocket(
rtc::SocketAddress(ip(), 0), min_port(), max_port(),
false /* ssl */);
if (!socket_) {
LOG_J(LS_ERROR, this) << "TCP socket creation failed.";
return false;
}
socket_->SignalNewConnection.connect(this, &TCPPort::OnNewConnection);
socket_->SignalAddressReady.connect(this, &TCPPort::OnAddressReady);
}
return true;
}
TCPPort::~TCPPort() {
delete socket_;
std::list<Incoming>::iterator it;
for (it = incoming_.begin(); it != incoming_.end(); ++it)
delete it->socket;
incoming_.clear();
}
Connection* TCPPort::CreateConnection(const Candidate& address,
CandidateOrigin origin) {
// We only support TCP protocols
if ((address.protocol() != TCP_PROTOCOL_NAME) &&
(address.protocol() != SSLTCP_PROTOCOL_NAME)) {
return NULL;
}
if (address.tcptype() == TCPTYPE_ACTIVE_STR ||
(address.tcptype().empty() && address.address().port() == 0)) {
// It's active only candidate, we should not try to create connections
// for these candidates.
return NULL;
}
// We can't accept TCP connections incoming on other ports
if (origin == ORIGIN_OTHER_PORT)
return NULL;
// Check if we are allowed to make outgoing TCP connections
if (incoming_only_ && (origin == ORIGIN_MESSAGE))
return NULL;
// We don't know how to act as an ssl server yet
if ((address.protocol() == SSLTCP_PROTOCOL_NAME) &&
(origin == ORIGIN_THIS_PORT)) {
return NULL;
}
if (!IsCompatibleAddress(address.address())) {
return NULL;
}
TCPConnection* conn = NULL;
if (rtc::AsyncPacketSocket* socket =
GetIncoming(address.address(), true)) {
socket->SignalReadPacket.disconnect(this);
conn = new TCPConnection(this, address, socket);
} else {
conn = new TCPConnection(this, address);
}
AddConnection(conn);
return conn;
}
void TCPPort::PrepareAddress() {
if (socket_) {
// If socket isn't bound yet the address will be added in
// OnAddressReady(). Socket may be in the CLOSED state if Listen()
// failed, we still want to add the socket address.
LOG(LS_VERBOSE) << "Preparing TCP address, current state: "
<< socket_->GetState();
if (socket_->GetState() == rtc::AsyncPacketSocket::STATE_BOUND ||
socket_->GetState() == rtc::AsyncPacketSocket::STATE_CLOSED)
AddAddress(socket_->GetLocalAddress(), socket_->GetLocalAddress(),
rtc::SocketAddress(),
TCP_PROTOCOL_NAME, TCPTYPE_PASSIVE_STR, LOCAL_PORT_TYPE,
ICE_TYPE_PREFERENCE_HOST_TCP, 0, true);
} else {
LOG_J(LS_INFO, this) << "Not listening due to firewall restrictions.";
// Note: We still add the address, since otherwise the remote side won't
// recognize our incoming TCP connections.
AddAddress(rtc::SocketAddress(ip(), 0),
rtc::SocketAddress(ip(), 0), rtc::SocketAddress(),
TCP_PROTOCOL_NAME, TCPTYPE_ACTIVE_STR, LOCAL_PORT_TYPE,
ICE_TYPE_PREFERENCE_HOST_TCP, 0, true);
}
}
int TCPPort::SendTo(const void* data, size_t size,
const rtc::SocketAddress& addr,
const rtc::PacketOptions& options,
bool payload) {
rtc::AsyncPacketSocket * socket = NULL;
if (TCPConnection * conn = static_cast<TCPConnection*>(GetConnection(addr))) {
socket = conn->socket();
} else {
socket = GetIncoming(addr);
}
if (!socket) {
LOG_J(LS_ERROR, this) << "Attempted to send to an unknown destination, "
<< addr.ToSensitiveString();
return -1; // TODO: Set error_
}
int sent = socket->Send(data, size, options);
if (sent < 0) {
error_ = socket->GetError();
LOG_J(LS_ERROR, this) << "TCP send of " << size
<< " bytes failed with error " << error_;
}
return sent;
}
int TCPPort::GetOption(rtc::Socket::Option opt, int* value) {
if (socket_) {
return socket_->GetOption(opt, value);
} else {
return SOCKET_ERROR;
}
}
int TCPPort::SetOption(rtc::Socket::Option opt, int value) {
if (socket_) {
return socket_->SetOption(opt, value);
} else {
return SOCKET_ERROR;
}
}
int TCPPort::GetError() {
return error_;
}
void TCPPort::OnNewConnection(rtc::AsyncPacketSocket* socket,
rtc::AsyncPacketSocket* new_socket) {
ASSERT(socket == socket_);
Incoming incoming;
incoming.addr = new_socket->GetRemoteAddress();
incoming.socket = new_socket;
incoming.socket->SignalReadPacket.connect(this, &TCPPort::OnReadPacket);
incoming.socket->SignalReadyToSend.connect(this, &TCPPort::OnReadyToSend);
LOG_J(LS_VERBOSE, this) << "Accepted connection from "
<< incoming.addr.ToSensitiveString();
incoming_.push_back(incoming);
}
rtc::AsyncPacketSocket* TCPPort::GetIncoming(
const rtc::SocketAddress& addr, bool remove) {
rtc::AsyncPacketSocket* socket = NULL;
for (std::list<Incoming>::iterator it = incoming_.begin();
it != incoming_.end(); ++it) {
if (it->addr == addr) {
socket = it->socket;
if (remove)
incoming_.erase(it);
break;
}
}
return socket;
}
void TCPPort::OnReadPacket(rtc::AsyncPacketSocket* socket,
const char* data, size_t size,
const rtc::SocketAddress& remote_addr,
const rtc::PacketTime& packet_time) {
Port::OnReadPacket(data, size, remote_addr, PROTO_TCP);
}
void TCPPort::OnReadyToSend(rtc::AsyncPacketSocket* socket) {
Port::OnReadyToSend();
}
void TCPPort::OnAddressReady(rtc::AsyncPacketSocket* socket,
const rtc::SocketAddress& address) {
AddAddress(address, address, rtc::SocketAddress(),
TCP_PROTOCOL_NAME, TCPTYPE_PASSIVE_STR, LOCAL_PORT_TYPE,
ICE_TYPE_PREFERENCE_HOST_TCP, 0, true);
}
TCPConnection::TCPConnection(TCPPort* port, const Candidate& candidate,
rtc::AsyncPacketSocket* socket)
: Connection(port, 0, candidate), socket_(socket), error_(0) {
bool outgoing = (socket_ == NULL);
if (outgoing) {
// TODO: Handle failures here (unlikely since TCP).
int opts = (candidate.protocol() == SSLTCP_PROTOCOL_NAME) ?
rtc::PacketSocketFactory::OPT_SSLTCP : 0;
socket_ = port->socket_factory()->CreateClientTcpSocket(
rtc::SocketAddress(port->ip(), 0),
candidate.address(), port->proxy(), port->user_agent(), opts);
if (socket_) {
LOG_J(LS_VERBOSE, this) << "Connecting from "
<< socket_->GetLocalAddress().ToSensitiveString()
<< " to "
<< candidate.address().ToSensitiveString();
set_connected(false);
socket_->SignalConnect.connect(this, &TCPConnection::OnConnect);
} else {
LOG_J(LS_WARNING, this) << "Failed to create connection to "
<< candidate.address().ToSensitiveString();
}
} else {
// Incoming connections should match the network address.
ASSERT(socket_->GetLocalAddress().ipaddr() == port->ip());
}
if (socket_) {
socket_->SignalReadPacket.connect(this, &TCPConnection::OnReadPacket);
socket_->SignalReadyToSend.connect(this, &TCPConnection::OnReadyToSend);
socket_->SignalClose.connect(this, &TCPConnection::OnClose);
}
}
TCPConnection::~TCPConnection() {
delete socket_;
}
int TCPConnection::Send(const void* data, size_t size,
const rtc::PacketOptions& options) {
if (!socket_) {
error_ = ENOTCONN;
return SOCKET_ERROR;
}
if (write_state() != STATE_WRITABLE) {
// TODO: Should STATE_WRITE_TIMEOUT return a non-blocking error?
error_ = EWOULDBLOCK;
return SOCKET_ERROR;
}
int sent = socket_->Send(data, size, options);
if (sent < 0) {
error_ = socket_->GetError();
} else {
send_rate_tracker_.Update(sent);
}
return sent;
}
int TCPConnection::GetError() {
return error_;
}
void TCPConnection::OnConnect(rtc::AsyncPacketSocket* socket) {
ASSERT(socket == socket_);
// Do not use this connection if the socket bound to a different address than
// the one we asked for. This is seen in Chrome, where TCP sockets cannot be
// given a binding address, and the platform is expected to pick the
// correct local address.
if (socket->GetLocalAddress().ipaddr() == port()->ip()) {
LOG_J(LS_VERBOSE, this) << "Connection established to "
<< socket->GetRemoteAddress().ToSensitiveString();
set_connected(true);
} else {
LOG_J(LS_WARNING, this) << "Dropping connection as TCP socket bound to a "
<< "different address from the local candidate.";
socket_->Close();
}
}
void TCPConnection::OnClose(rtc::AsyncPacketSocket* socket, int error) {
ASSERT(socket == socket_);
LOG_J(LS_VERBOSE, this) << "Connection closed with error " << error;
set_connected(false);
set_write_state(STATE_WRITE_TIMEOUT);
}
void TCPConnection::OnReadPacket(
rtc::AsyncPacketSocket* socket, const char* data, size_t size,
const rtc::SocketAddress& remote_addr,
const rtc::PacketTime& packet_time) {
ASSERT(socket == socket_);
Connection::OnReadPacket(data, size, packet_time);
}
void TCPConnection::OnReadyToSend(rtc::AsyncPacketSocket* socket) {
ASSERT(socket == socket_);
Connection::OnReadyToSend();
}
} // namespace cricket