1 /* 2 * libjingle 3 * Copyright 2004--2005, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "talk/p2p/base/tcpport.h" 29 30 #include "talk/base/common.h" 31 #include "talk/base/logging.h" 32 #include "talk/p2p/base/common.h" 33 34 namespace cricket { 35 36 TCPPort::TCPPort(talk_base::Thread* thread, 37 talk_base::PacketSocketFactory* factory, 38 talk_base::Network* network, const talk_base::IPAddress& ip, 39 int min_port, int max_port, const std::string& username, 40 const std::string& password, bool allow_listen) 41 : Port(thread, LOCAL_PORT_TYPE, factory, network, ip, min_port, max_port, 42 username, password), 43 incoming_only_(false), 44 allow_listen_(allow_listen), 45 socket_(NULL), 46 error_(0) { 47 // TODO(mallinath) - Set preference value as per RFC 6544. 48 // http://b/issue?id=7141794 49 } 50 51 bool TCPPort::Init() { 52 if (allow_listen_) { 53 // Treat failure to create or bind a TCP socket as fatal. This 54 // should never happen. 55 socket_ = socket_factory()->CreateServerTcpSocket( 56 talk_base::SocketAddress(ip(), 0), min_port(), max_port(), 57 false /* ssl */); 58 if (!socket_) { 59 LOG_J(LS_ERROR, this) << "TCP socket creation failed."; 60 return false; 61 } 62 socket_->SignalNewConnection.connect(this, &TCPPort::OnNewConnection); 63 socket_->SignalAddressReady.connect(this, &TCPPort::OnAddressReady); 64 } 65 return true; 66 } 67 68 TCPPort::~TCPPort() { 69 delete socket_; 70 std::list<Incoming>::iterator it; 71 for (it = incoming_.begin(); it != incoming_.end(); ++it) 72 delete it->socket; 73 incoming_.clear(); 74 } 75 76 Connection* TCPPort::CreateConnection(const Candidate& address, 77 CandidateOrigin origin) { 78 // We only support TCP protocols 79 if ((address.protocol() != TCP_PROTOCOL_NAME) && 80 (address.protocol() != SSLTCP_PROTOCOL_NAME)) { 81 return NULL; 82 } 83 84 // We can't accept TCP connections incoming on other ports 85 if (origin == ORIGIN_OTHER_PORT) 86 return NULL; 87 88 // Check if we are allowed to make outgoing TCP connections 89 if (incoming_only_ && (origin == ORIGIN_MESSAGE)) 90 return NULL; 91 92 // We don't know how to act as an ssl server yet 93 if ((address.protocol() == SSLTCP_PROTOCOL_NAME) && 94 (origin == ORIGIN_THIS_PORT)) { 95 return NULL; 96 } 97 98 if (!IsCompatibleAddress(address.address())) { 99 return NULL; 100 } 101 102 TCPConnection* conn = NULL; 103 if (talk_base::AsyncPacketSocket* socket = 104 GetIncoming(address.address(), true)) { 105 socket->SignalReadPacket.disconnect(this); 106 conn = new TCPConnection(this, address, socket); 107 } else { 108 conn = new TCPConnection(this, address); 109 } 110 AddConnection(conn); 111 return conn; 112 } 113 114 void TCPPort::PrepareAddress() { 115 if (socket_) { 116 // If socket isn't bound yet the address will be added in 117 // OnAddressReady(). Socket may be in the CLOSED state if Listen() 118 // failed, we still want ot add the socket address. 119 LOG(LS_VERBOSE) << "Preparing TCP address, current state: " 120 << socket_->GetState(); 121 if (socket_->GetState() == talk_base::AsyncPacketSocket::STATE_BOUND || 122 socket_->GetState() == talk_base::AsyncPacketSocket::STATE_CLOSED) 123 AddAddress(socket_->GetLocalAddress(), socket_->GetLocalAddress(), 124 talk_base::SocketAddress(), 125 TCP_PROTOCOL_NAME, LOCAL_PORT_TYPE, 126 ICE_TYPE_PREFERENCE_HOST_TCP, true); 127 } else { 128 LOG_J(LS_INFO, this) << "Not listening due to firewall restrictions."; 129 // Note: We still add the address, since otherwise the remote side won't 130 // recognize our incoming TCP connections. 131 AddAddress(talk_base::SocketAddress(ip(), 0), 132 talk_base::SocketAddress(ip(), 0), talk_base::SocketAddress(), 133 TCP_PROTOCOL_NAME, LOCAL_PORT_TYPE, ICE_TYPE_PREFERENCE_HOST_TCP, 134 true); 135 } 136 } 137 138 int TCPPort::SendTo(const void* data, size_t size, 139 const talk_base::SocketAddress& addr, 140 const talk_base::PacketOptions& options, 141 bool payload) { 142 talk_base::AsyncPacketSocket * socket = NULL; 143 if (TCPConnection * conn = static_cast<TCPConnection*>(GetConnection(addr))) { 144 socket = conn->socket(); 145 } else { 146 socket = GetIncoming(addr); 147 } 148 if (!socket) { 149 LOG_J(LS_ERROR, this) << "Attempted to send to an unknown destination, " 150 << addr.ToSensitiveString(); 151 return -1; // TODO: Set error_ 152 } 153 154 int sent = socket->Send(data, size, options); 155 if (sent < 0) { 156 error_ = socket->GetError(); 157 LOG_J(LS_ERROR, this) << "TCP send of " << size 158 << " bytes failed with error " << error_; 159 } 160 return sent; 161 } 162 163 int TCPPort::GetOption(talk_base::Socket::Option opt, int* value) { 164 if (socket_) { 165 return socket_->GetOption(opt, value); 166 } else { 167 return SOCKET_ERROR; 168 } 169 } 170 171 int TCPPort::SetOption(talk_base::Socket::Option opt, int value) { 172 if (socket_) { 173 return socket_->SetOption(opt, value); 174 } else { 175 return SOCKET_ERROR; 176 } 177 } 178 179 int TCPPort::GetError() { 180 return error_; 181 } 182 183 void TCPPort::OnNewConnection(talk_base::AsyncPacketSocket* socket, 184 talk_base::AsyncPacketSocket* new_socket) { 185 ASSERT(socket == socket_); 186 187 Incoming incoming; 188 incoming.addr = new_socket->GetRemoteAddress(); 189 incoming.socket = new_socket; 190 incoming.socket->SignalReadPacket.connect(this, &TCPPort::OnReadPacket); 191 incoming.socket->SignalReadyToSend.connect(this, &TCPPort::OnReadyToSend); 192 193 LOG_J(LS_VERBOSE, this) << "Accepted connection from " 194 << incoming.addr.ToSensitiveString(); 195 incoming_.push_back(incoming); 196 } 197 198 talk_base::AsyncPacketSocket* TCPPort::GetIncoming( 199 const talk_base::SocketAddress& addr, bool remove) { 200 talk_base::AsyncPacketSocket* socket = NULL; 201 for (std::list<Incoming>::iterator it = incoming_.begin(); 202 it != incoming_.end(); ++it) { 203 if (it->addr == addr) { 204 socket = it->socket; 205 if (remove) 206 incoming_.erase(it); 207 break; 208 } 209 } 210 return socket; 211 } 212 213 void TCPPort::OnReadPacket(talk_base::AsyncPacketSocket* socket, 214 const char* data, size_t size, 215 const talk_base::SocketAddress& remote_addr, 216 const talk_base::PacketTime& packet_time) { 217 Port::OnReadPacket(data, size, remote_addr, PROTO_TCP); 218 } 219 220 void TCPPort::OnReadyToSend(talk_base::AsyncPacketSocket* socket) { 221 Port::OnReadyToSend(); 222 } 223 224 void TCPPort::OnAddressReady(talk_base::AsyncPacketSocket* socket, 225 const talk_base::SocketAddress& address) { 226 AddAddress(address, address, talk_base::SocketAddress(), "tcp", 227 LOCAL_PORT_TYPE, ICE_TYPE_PREFERENCE_HOST_TCP, 228 true); 229 } 230 231 TCPConnection::TCPConnection(TCPPort* port, const Candidate& candidate, 232 talk_base::AsyncPacketSocket* socket) 233 : Connection(port, 0, candidate), socket_(socket), error_(0) { 234 bool outgoing = (socket_ == NULL); 235 if (outgoing) { 236 // TODO: Handle failures here (unlikely since TCP). 237 int opts = (candidate.protocol() == SSLTCP_PROTOCOL_NAME) ? 238 talk_base::PacketSocketFactory::OPT_SSLTCP : 0; 239 socket_ = port->socket_factory()->CreateClientTcpSocket( 240 talk_base::SocketAddress(port->ip(), 0), 241 candidate.address(), port->proxy(), port->user_agent(), opts); 242 if (socket_) { 243 LOG_J(LS_VERBOSE, this) << "Connecting from " 244 << socket_->GetLocalAddress().ToSensitiveString() 245 << " to " 246 << candidate.address().ToSensitiveString(); 247 set_connected(false); 248 socket_->SignalConnect.connect(this, &TCPConnection::OnConnect); 249 } else { 250 LOG_J(LS_WARNING, this) << "Failed to create connection to " 251 << candidate.address().ToSensitiveString(); 252 } 253 } else { 254 // Incoming connections should match the network address. 255 ASSERT(socket_->GetLocalAddress().ipaddr() == port->ip()); 256 } 257 258 if (socket_) { 259 socket_->SignalReadPacket.connect(this, &TCPConnection::OnReadPacket); 260 socket_->SignalReadyToSend.connect(this, &TCPConnection::OnReadyToSend); 261 socket_->SignalClose.connect(this, &TCPConnection::OnClose); 262 } 263 } 264 265 TCPConnection::~TCPConnection() { 266 delete socket_; 267 } 268 269 int TCPConnection::Send(const void* data, size_t size, 270 const talk_base::PacketOptions& options) { 271 if (!socket_) { 272 error_ = ENOTCONN; 273 return SOCKET_ERROR; 274 } 275 276 if (write_state() != STATE_WRITABLE) { 277 // TODO: Should STATE_WRITE_TIMEOUT return a non-blocking error? 278 error_ = EWOULDBLOCK; 279 return SOCKET_ERROR; 280 } 281 int sent = socket_->Send(data, size, options); 282 if (sent < 0) { 283 error_ = socket_->GetError(); 284 } else { 285 send_rate_tracker_.Update(sent); 286 } 287 return sent; 288 } 289 290 int TCPConnection::GetError() { 291 return error_; 292 } 293 294 void TCPConnection::OnConnect(talk_base::AsyncPacketSocket* socket) { 295 ASSERT(socket == socket_); 296 // Do not use this connection if the socket bound to a different address than 297 // the one we asked for. This is seen in Chrome, where TCP sockets cannot be 298 // given a binding address, and the platform is expected to pick the 299 // correct local address. 300 if (socket->GetLocalAddress().ipaddr() == port()->ip()) { 301 LOG_J(LS_VERBOSE, this) << "Connection established to " 302 << socket->GetRemoteAddress().ToSensitiveString(); 303 set_connected(true); 304 } else { 305 LOG_J(LS_WARNING, this) << "Dropping connection as TCP socket bound to a " 306 << "different address from the local candidate."; 307 socket_->Close(); 308 } 309 } 310 311 void TCPConnection::OnClose(talk_base::AsyncPacketSocket* socket, int error) { 312 ASSERT(socket == socket_); 313 LOG_J(LS_VERBOSE, this) << "Connection closed with error " << error; 314 set_connected(false); 315 set_write_state(STATE_WRITE_TIMEOUT); 316 } 317 318 void TCPConnection::OnReadPacket( 319 talk_base::AsyncPacketSocket* socket, const char* data, size_t size, 320 const talk_base::SocketAddress& remote_addr, 321 const talk_base::PacketTime& packet_time) { 322 ASSERT(socket == socket_); 323 Connection::OnReadPacket(data, size, packet_time); 324 } 325 326 void TCPConnection::OnReadyToSend(talk_base::AsyncPacketSocket* socket) { 327 ASSERT(socket == socket_); 328 Connection::OnReadyToSend(); 329 } 330 331 } // namespace cricket 332