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| 1 // Copyright 2013 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 #include "chrome/browser/extensions/api/cast_channel/cast_socket.h" | |
| 6 | |
| 7 #include <stdlib.h> | |
| 8 #include <string.h> | |
| 9 | |
| 10 #include "base/bind.h" | |
| 11 #include "base/callback_helpers.h" | |
| 12 #include "base/lazy_instance.h" | |
| 13 #include "base/numerics/safe_conversions.h" | |
| 14 #include "base/strings/string_number_conversions.h" | |
| 15 #include "base/sys_byteorder.h" | |
| 16 #include "chrome/browser/extensions/api/cast_channel/cast_auth_util.h" | |
| 17 #include "chrome/browser/extensions/api/cast_channel/cast_channel.pb.h" | |
| 18 #include "chrome/browser/extensions/api/cast_channel/cast_message_util.h" | |
| 19 #include "net/base/address_list.h" | |
| 20 #include "net/base/host_port_pair.h" | |
| 21 #include "net/base/net_errors.h" | |
| 22 #include "net/base/net_util.h" | |
| 23 #include "net/cert/cert_verifier.h" | |
| 24 #include "net/cert/x509_certificate.h" | |
| 25 #include "net/http/transport_security_state.h" | |
| 26 #include "net/socket/client_socket_factory.h" | |
| 27 #include "net/socket/client_socket_handle.h" | |
| 28 #include "net/socket/ssl_client_socket.h" | |
| 29 #include "net/socket/stream_socket.h" | |
| 30 #include "net/socket/tcp_client_socket.h" | |
| 31 #include "net/ssl/ssl_config_service.h" | |
| 32 #include "net/ssl/ssl_info.h" | |
| 33 | |
| 34 // Assumes |ip_endpoint_| of type net::IPEndPoint and |channel_auth_| of enum | |
| 35 // type ChannelAuthType are available in the current scope. | |
| 36 #define VLOG_WITH_CONNECTION(level) VLOG(level) << "[" << \ | |
| 37 ip_endpoint_.ToString() << ", auth=" << channel_auth_ << "] " | |
| 38 | |
| 39 namespace { | |
| 40 | |
| 41 // The default keepalive delay. On Linux, keepalives probes will be sent after | |
| 42 // the socket is idle for this length of time, and the socket will be closed | |
| 43 // after 9 failed probes. So the total idle time before close is 10 * | |
| 44 // kTcpKeepAliveDelaySecs. | |
| 45 const int kTcpKeepAliveDelaySecs = 10; | |
| 46 | |
| 47 } // namespace | |
| 48 | |
| 49 namespace extensions { | |
| 50 | |
| 51 static base::LazyInstance<BrowserContextKeyedAPIFactory< | |
| 52 ApiResourceManager<api::cast_channel::CastSocket> > > g_factory = | |
| 53 LAZY_INSTANCE_INITIALIZER; | |
| 54 | |
| 55 // static | |
| 56 template <> | |
| 57 BrowserContextKeyedAPIFactory< | |
| 58 ApiResourceManager<api::cast_channel::CastSocket> >* | |
| 59 ApiResourceManager<api::cast_channel::CastSocket>::GetFactoryInstance() { | |
| 60 return g_factory.Pointer(); | |
| 61 } | |
| 62 | |
| 63 namespace api { | |
| 64 namespace cast_channel { | |
| 65 | |
| 66 CastSocket::CastSocket(const std::string& owner_extension_id, | |
| 67 const net::IPEndPoint& ip_endpoint, | |
| 68 ChannelAuthType channel_auth, | |
| 69 CastSocket::Delegate* delegate, | |
| 70 net::NetLog* net_log, | |
| 71 const base::TimeDelta& timeout) : | |
| 72 ApiResource(owner_extension_id), | |
| 73 channel_id_(0), | |
| 74 ip_endpoint_(ip_endpoint), | |
| 75 channel_auth_(channel_auth), | |
| 76 delegate_(delegate), | |
| 77 current_message_size_(0), | |
| 78 current_message_(new CastMessage()), | |
| 79 net_log_(net_log), | |
| 80 connect_timeout_(timeout), | |
| 81 connect_timeout_timer_(new base::OneShotTimer<CastSocket>), | |
| 82 is_canceled_(false), | |
| 83 connect_state_(CONN_STATE_NONE), | |
| 84 write_state_(WRITE_STATE_NONE), | |
| 85 read_state_(READ_STATE_NONE), | |
| 86 error_state_(CHANNEL_ERROR_NONE), | |
| 87 ready_state_(READY_STATE_NONE) { | |
| 88 DCHECK(net_log_); | |
| 89 DCHECK(channel_auth_ == CHANNEL_AUTH_TYPE_SSL || | |
| 90 channel_auth_ == CHANNEL_AUTH_TYPE_SSL_VERIFIED); | |
| 91 net_log_source_.type = net::NetLog::SOURCE_SOCKET; | |
| 92 net_log_source_.id = net_log_->NextID(); | |
| 93 | |
| 94 // Reuse these buffers for each message. | |
| 95 header_read_buffer_ = new net::GrowableIOBuffer(); | |
| 96 header_read_buffer_->SetCapacity(MessageHeader::header_size()); | |
| 97 body_read_buffer_ = new net::GrowableIOBuffer(); | |
| 98 body_read_buffer_->SetCapacity(MessageHeader::max_message_size()); | |
| 99 current_read_buffer_ = header_read_buffer_; | |
| 100 } | |
| 101 | |
| 102 CastSocket::~CastSocket() { } | |
| 103 | |
| 104 ReadyState CastSocket::ready_state() const { | |
| 105 return ready_state_; | |
| 106 } | |
| 107 | |
| 108 ChannelError CastSocket::error_state() const { | |
| 109 return error_state_; | |
| 110 } | |
| 111 | |
| 112 scoped_ptr<net::TCPClientSocket> CastSocket::CreateTcpSocket() { | |
| 113 net::AddressList addresses(ip_endpoint_); | |
| 114 return scoped_ptr<net::TCPClientSocket>( | |
| 115 new net::TCPClientSocket(addresses, net_log_, net_log_source_)); | |
| 116 // Options cannot be set on the TCPClientSocket yet, because the | |
| 117 // underlying platform socket will not be created until Bind() | |
| 118 // or Connect() is called. | |
| 119 } | |
| 120 | |
| 121 scoped_ptr<net::SSLClientSocket> CastSocket::CreateSslSocket( | |
| 122 scoped_ptr<net::StreamSocket> socket) { | |
| 123 net::SSLConfig ssl_config; | |
| 124 // If a peer cert was extracted in a previous attempt to connect, then | |
| 125 // whitelist that cert. | |
| 126 if (!peer_cert_.empty()) { | |
| 127 net::SSLConfig::CertAndStatus cert_and_status; | |
| 128 cert_and_status.cert_status = net::CERT_STATUS_AUTHORITY_INVALID; | |
| 129 cert_and_status.der_cert = peer_cert_; | |
| 130 ssl_config.allowed_bad_certs.push_back(cert_and_status); | |
| 131 } | |
| 132 | |
| 133 cert_verifier_.reset(net::CertVerifier::CreateDefault()); | |
| 134 transport_security_state_.reset(new net::TransportSecurityState); | |
| 135 net::SSLClientSocketContext context; | |
| 136 // CertVerifier and TransportSecurityState are owned by us, not the | |
| 137 // context object. | |
| 138 context.cert_verifier = cert_verifier_.get(); | |
| 139 context.transport_security_state = transport_security_state_.get(); | |
| 140 | |
| 141 scoped_ptr<net::ClientSocketHandle> connection(new net::ClientSocketHandle); | |
| 142 connection->SetSocket(socket.Pass()); | |
| 143 net::HostPortPair host_and_port = net::HostPortPair::FromIPEndPoint( | |
| 144 ip_endpoint_); | |
| 145 | |
| 146 return net::ClientSocketFactory::GetDefaultFactory()->CreateSSLClientSocket( | |
| 147 connection.Pass(), host_and_port, ssl_config, context); | |
| 148 } | |
| 149 | |
| 150 bool CastSocket::ExtractPeerCert(std::string* cert) { | |
| 151 DCHECK(cert); | |
| 152 DCHECK(peer_cert_.empty()); | |
| 153 net::SSLInfo ssl_info; | |
| 154 if (!socket_->GetSSLInfo(&ssl_info) || !ssl_info.cert.get()) | |
| 155 return false; | |
| 156 bool result = net::X509Certificate::GetDEREncoded( | |
| 157 ssl_info.cert->os_cert_handle(), cert); | |
| 158 if (result) | |
| 159 VLOG_WITH_CONNECTION(1) << "Successfully extracted peer certificate: " | |
| 160 << *cert; | |
| 161 return result; | |
| 162 } | |
| 163 | |
| 164 bool CastSocket::VerifyChallengeReply() { | |
| 165 return AuthenticateChallengeReply(*challenge_reply_.get(), peer_cert_); | |
| 166 } | |
| 167 | |
| 168 void CastSocket::Connect(const net::CompletionCallback& callback) { | |
| 169 DCHECK(CalledOnValidThread()); | |
| 170 VLOG_WITH_CONNECTION(1) << "Connect readyState = " << ready_state_; | |
| 171 if (ready_state_ != READY_STATE_NONE) { | |
| 172 callback.Run(net::ERR_CONNECTION_FAILED); | |
| 173 return; | |
| 174 } | |
| 175 ready_state_ = READY_STATE_CONNECTING; | |
| 176 connect_callback_ = callback; | |
| 177 connect_state_ = CONN_STATE_TCP_CONNECT; | |
| 178 if (connect_timeout_.InMicroseconds() > 0) { | |
| 179 GetTimer()->Start( | |
| 180 FROM_HERE, | |
| 181 connect_timeout_, | |
| 182 base::Bind(&CastSocket::CancelConnect, AsWeakPtr())); | |
| 183 } | |
| 184 DoConnectLoop(net::OK); | |
| 185 } | |
| 186 | |
| 187 void CastSocket::PostTaskToStartConnectLoop(int result) { | |
| 188 DCHECK(CalledOnValidThread()); | |
| 189 base::MessageLoop::current()->PostTask( | |
| 190 FROM_HERE, | |
| 191 base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr(), result)); | |
| 192 } | |
| 193 | |
| 194 void CastSocket::CancelConnect() { | |
| 195 DCHECK(CalledOnValidThread()); | |
| 196 // Stop all pending connection setup tasks and report back to the client. | |
| 197 is_canceled_ = true; | |
| 198 VLOG_WITH_CONNECTION(1) << "Timeout while establishing a connection."; | |
| 199 DoConnectCallback(net::ERR_TIMED_OUT); | |
| 200 } | |
| 201 | |
| 202 // This method performs the state machine transitions for connection flow. | |
| 203 // There are two entry points to this method: | |
| 204 // 1. Connect method: this starts the flow | |
| 205 // 2. Callback from network operations that finish asynchronously | |
| 206 void CastSocket::DoConnectLoop(int result) { | |
| 207 if (is_canceled_) { | |
| 208 LOG(ERROR) << "CANCELLED - Aborting DoConnectLoop."; | |
| 209 return; | |
| 210 } | |
| 211 // Network operations can either finish synchronously or asynchronously. | |
| 212 // This method executes the state machine transitions in a loop so that | |
| 213 // correct state transitions happen even when network operations finish | |
| 214 // synchronously. | |
| 215 int rv = result; | |
| 216 do { | |
| 217 ConnectionState state = connect_state_; | |
| 218 // Default to CONN_STATE_NONE, which breaks the processing loop if any | |
| 219 // handler fails to transition to another state to continue processing. | |
| 220 connect_state_ = CONN_STATE_NONE; | |
| 221 switch (state) { | |
| 222 case CONN_STATE_TCP_CONNECT: | |
| 223 rv = DoTcpConnect(); | |
| 224 break; | |
| 225 case CONN_STATE_TCP_CONNECT_COMPLETE: | |
| 226 rv = DoTcpConnectComplete(rv); | |
| 227 break; | |
| 228 case CONN_STATE_SSL_CONNECT: | |
| 229 DCHECK_EQ(net::OK, rv); | |
| 230 rv = DoSslConnect(); | |
| 231 break; | |
| 232 case CONN_STATE_SSL_CONNECT_COMPLETE: | |
| 233 rv = DoSslConnectComplete(rv); | |
| 234 break; | |
| 235 case CONN_STATE_AUTH_CHALLENGE_SEND: | |
| 236 rv = DoAuthChallengeSend(); | |
| 237 break; | |
| 238 case CONN_STATE_AUTH_CHALLENGE_SEND_COMPLETE: | |
| 239 rv = DoAuthChallengeSendComplete(rv); | |
| 240 break; | |
| 241 case CONN_STATE_AUTH_CHALLENGE_REPLY_COMPLETE: | |
| 242 rv = DoAuthChallengeReplyComplete(rv); | |
| 243 break; | |
| 244 default: | |
| 245 NOTREACHED() << "BUG in connect flow. Unknown state: " << state; | |
| 246 break; | |
| 247 } | |
| 248 } while (rv != net::ERR_IO_PENDING && connect_state_ != CONN_STATE_NONE); | |
| 249 // Get out of the loop either when: | |
| 250 // a. A network operation is pending, OR | |
| 251 // b. The Do* method called did not change state | |
| 252 | |
| 253 // Connect loop is finished: if there is no pending IO invoke the callback. | |
| 254 if (rv != net::ERR_IO_PENDING) { | |
| 255 GetTimer()->Stop(); | |
| 256 DoConnectCallback(rv); | |
| 257 } | |
| 258 } | |
| 259 | |
| 260 int CastSocket::DoTcpConnect() { | |
| 261 VLOG_WITH_CONNECTION(1) << "DoTcpConnect"; | |
| 262 connect_state_ = CONN_STATE_TCP_CONNECT_COMPLETE; | |
| 263 tcp_socket_ = CreateTcpSocket(); | |
| 264 return tcp_socket_->Connect( | |
| 265 base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr())); | |
| 266 } | |
| 267 | |
| 268 int CastSocket::DoTcpConnectComplete(int result) { | |
| 269 VLOG_WITH_CONNECTION(1) << "DoTcpConnectComplete: " << result; | |
| 270 if (result == net::OK) { | |
| 271 // Enable TCP protocol-level keep-alive. | |
| 272 bool result = tcp_socket_->SetKeepAlive(true, kTcpKeepAliveDelaySecs); | |
| 273 LOG_IF(WARNING, !result) << "Failed to SetKeepAlive."; | |
| 274 connect_state_ = CONN_STATE_SSL_CONNECT; | |
| 275 } | |
| 276 return result; | |
| 277 } | |
| 278 | |
| 279 int CastSocket::DoSslConnect() { | |
| 280 VLOG_WITH_CONNECTION(1) << "DoSslConnect"; | |
| 281 connect_state_ = CONN_STATE_SSL_CONNECT_COMPLETE; | |
| 282 socket_ = CreateSslSocket(tcp_socket_.PassAs<net::StreamSocket>()); | |
| 283 return socket_->Connect( | |
| 284 base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr())); | |
| 285 } | |
| 286 | |
| 287 int CastSocket::DoSslConnectComplete(int result) { | |
| 288 VLOG_WITH_CONNECTION(1) << "DoSslConnectComplete: " << result; | |
| 289 if (result == net::ERR_CERT_AUTHORITY_INVALID && | |
| 290 peer_cert_.empty() && ExtractPeerCert(&peer_cert_)) { | |
| 291 connect_state_ = CONN_STATE_TCP_CONNECT; | |
| 292 } else if (result == net::OK && | |
| 293 channel_auth_ == CHANNEL_AUTH_TYPE_SSL_VERIFIED) { | |
| 294 connect_state_ = CONN_STATE_AUTH_CHALLENGE_SEND; | |
| 295 } | |
| 296 return result; | |
| 297 } | |
| 298 | |
| 299 int CastSocket::DoAuthChallengeSend() { | |
| 300 VLOG_WITH_CONNECTION(1) << "DoAuthChallengeSend"; | |
| 301 connect_state_ = CONN_STATE_AUTH_CHALLENGE_SEND_COMPLETE; | |
| 302 CastMessage challenge_message; | |
| 303 CreateAuthChallengeMessage(&challenge_message); | |
| 304 VLOG_WITH_CONNECTION(1) << "Sending challenge: " | |
| 305 << CastMessageToString(challenge_message); | |
| 306 // Post a task to send auth challenge so that DoWriteLoop is not nested inside | |
| 307 // DoConnectLoop. This is not strictly necessary but keeps the write loop | |
| 308 // code decoupled from connect loop code. | |
| 309 base::MessageLoop::current()->PostTask( | |
| 310 FROM_HERE, | |
| 311 base::Bind(&CastSocket::SendCastMessageInternal, | |
| 312 AsWeakPtr(), | |
| 313 challenge_message, | |
| 314 base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr()))); | |
| 315 // Always return IO_PENDING since the result is always asynchronous. | |
| 316 return net::ERR_IO_PENDING; | |
| 317 } | |
| 318 | |
| 319 int CastSocket::DoAuthChallengeSendComplete(int result) { | |
| 320 VLOG_WITH_CONNECTION(1) << "DoAuthChallengeSendComplete: " << result; | |
| 321 if (result < 0) | |
| 322 return result; | |
| 323 connect_state_ = CONN_STATE_AUTH_CHALLENGE_REPLY_COMPLETE; | |
| 324 // Post a task to start read loop so that DoReadLoop is not nested inside | |
| 325 // DoConnectLoop. This is not strictly necessary but keeps the read loop | |
| 326 // code decoupled from connect loop code. | |
| 327 PostTaskToStartReadLoop(); | |
| 328 // Always return IO_PENDING since the result is always asynchronous. | |
| 329 return net::ERR_IO_PENDING; | |
| 330 } | |
| 331 | |
| 332 int CastSocket::DoAuthChallengeReplyComplete(int result) { | |
| 333 VLOG_WITH_CONNECTION(1) << "DoAuthChallengeReplyComplete: " << result; | |
| 334 if (result < 0) | |
| 335 return result; | |
| 336 if (!VerifyChallengeReply()) | |
| 337 return net::ERR_FAILED; | |
| 338 VLOG_WITH_CONNECTION(1) << "Auth challenge verification succeeded"; | |
| 339 return net::OK; | |
| 340 } | |
| 341 | |
| 342 void CastSocket::DoConnectCallback(int result) { | |
| 343 ready_state_ = (result == net::OK) ? READY_STATE_OPEN : READY_STATE_CLOSED; | |
| 344 if (result == net::OK) { | |
| 345 error_state_ = CHANNEL_ERROR_NONE; | |
| 346 PostTaskToStartReadLoop(); | |
| 347 } else if (result == net::ERR_TIMED_OUT) { | |
| 348 error_state_ = CHANNEL_ERROR_CONNECT_TIMEOUT; | |
| 349 } else { | |
| 350 error_state_ = CHANNEL_ERROR_CONNECT_ERROR; | |
| 351 } | |
| 352 VLOG_WITH_CONNECTION(1) << "Calling Connect_Callback"; | |
| 353 base::ResetAndReturn(&connect_callback_).Run(result); | |
| 354 } | |
| 355 | |
| 356 void CastSocket::Close(const net::CompletionCallback& callback) { | |
| 357 DCHECK(CalledOnValidThread()); | |
| 358 VLOG_WITH_CONNECTION(1) << "Close ReadyState = " << ready_state_; | |
| 359 tcp_socket_.reset(); | |
| 360 socket_.reset(); | |
| 361 cert_verifier_.reset(); | |
| 362 transport_security_state_.reset(); | |
| 363 ready_state_ = READY_STATE_CLOSED; | |
| 364 callback.Run(net::OK); | |
| 365 // |callback| can delete |this| | |
| 366 } | |
| 367 | |
| 368 void CastSocket::SendMessage(const MessageInfo& message, | |
| 369 const net::CompletionCallback& callback) { | |
| 370 DCHECK(CalledOnValidThread()); | |
| 371 if (ready_state_ != READY_STATE_OPEN) { | |
| 372 callback.Run(net::ERR_FAILED); | |
| 373 return; | |
| 374 } | |
| 375 CastMessage message_proto; | |
| 376 if (!MessageInfoToCastMessage(message, &message_proto)) { | |
| 377 callback.Run(net::ERR_FAILED); | |
| 378 return; | |
| 379 } | |
| 380 | |
| 381 SendCastMessageInternal(message_proto, callback); | |
| 382 } | |
| 383 | |
| 384 void CastSocket::SendCastMessageInternal( | |
| 385 const CastMessage& message, | |
| 386 const net::CompletionCallback& callback) { | |
| 387 WriteRequest write_request(callback); | |
| 388 if (!write_request.SetContent(message)) { | |
| 389 callback.Run(net::ERR_FAILED); | |
| 390 return; | |
| 391 } | |
| 392 | |
| 393 write_queue_.push(write_request); | |
| 394 if (write_state_ == WRITE_STATE_NONE) { | |
| 395 write_state_ = WRITE_STATE_WRITE; | |
| 396 DoWriteLoop(net::OK); | |
| 397 } | |
| 398 } | |
| 399 | |
| 400 void CastSocket::DoWriteLoop(int result) { | |
| 401 DCHECK(CalledOnValidThread()); | |
| 402 VLOG_WITH_CONNECTION(1) << "DoWriteLoop queue size: " << write_queue_.size(); | |
| 403 | |
| 404 if (write_queue_.empty()) { | |
| 405 write_state_ = WRITE_STATE_NONE; | |
| 406 return; | |
| 407 } | |
| 408 | |
| 409 // Network operations can either finish synchronously or asynchronously. | |
| 410 // This method executes the state machine transitions in a loop so that | |
| 411 // write state transitions happen even when network operations finish | |
| 412 // synchronously. | |
| 413 int rv = result; | |
| 414 do { | |
| 415 WriteState state = write_state_; | |
| 416 write_state_ = WRITE_STATE_NONE; | |
| 417 switch (state) { | |
| 418 case WRITE_STATE_WRITE: | |
| 419 rv = DoWrite(); | |
| 420 break; | |
| 421 case WRITE_STATE_WRITE_COMPLETE: | |
| 422 rv = DoWriteComplete(rv); | |
| 423 break; | |
| 424 case WRITE_STATE_DO_CALLBACK: | |
| 425 rv = DoWriteCallback(); | |
| 426 break; | |
| 427 case WRITE_STATE_ERROR: | |
| 428 rv = DoWriteError(rv); | |
| 429 break; | |
| 430 default: | |
| 431 NOTREACHED() << "BUG in write flow. Unknown state: " << state; | |
| 432 break; | |
| 433 } | |
| 434 } while (!write_queue_.empty() && | |
| 435 rv != net::ERR_IO_PENDING && | |
| 436 write_state_ != WRITE_STATE_NONE); | |
| 437 | |
| 438 // If write loop is done because the queue is empty then set write | |
| 439 // state to NONE | |
| 440 if (write_queue_.empty()) | |
| 441 write_state_ = WRITE_STATE_NONE; | |
| 442 | |
| 443 // Write loop is done - if the result is ERR_FAILED then close with error. | |
| 444 if (rv == net::ERR_FAILED) | |
| 445 CloseWithError(error_state_); | |
| 446 } | |
| 447 | |
| 448 int CastSocket::DoWrite() { | |
| 449 DCHECK(!write_queue_.empty()); | |
| 450 WriteRequest& request = write_queue_.front(); | |
| 451 | |
| 452 VLOG_WITH_CONNECTION(2) << "WriteData byte_count = " | |
| 453 << request.io_buffer->size() << " bytes_written " | |
| 454 << request.io_buffer->BytesConsumed(); | |
| 455 | |
| 456 write_state_ = WRITE_STATE_WRITE_COMPLETE; | |
| 457 | |
| 458 return socket_->Write( | |
| 459 request.io_buffer.get(), | |
| 460 request.io_buffer->BytesRemaining(), | |
| 461 base::Bind(&CastSocket::DoWriteLoop, AsWeakPtr())); | |
| 462 } | |
| 463 | |
| 464 int CastSocket::DoWriteComplete(int result) { | |
| 465 DCHECK(!write_queue_.empty()); | |
| 466 if (result <= 0) { // NOTE that 0 also indicates an error | |
| 467 error_state_ = CHANNEL_ERROR_SOCKET_ERROR; | |
| 468 write_state_ = WRITE_STATE_ERROR; | |
| 469 return result == 0 ? net::ERR_FAILED : result; | |
| 470 } | |
| 471 | |
| 472 // Some bytes were successfully written | |
| 473 WriteRequest& request = write_queue_.front(); | |
| 474 scoped_refptr<net::DrainableIOBuffer> io_buffer = request.io_buffer; | |
| 475 io_buffer->DidConsume(result); | |
| 476 if (io_buffer->BytesRemaining() == 0) // Message fully sent | |
| 477 write_state_ = WRITE_STATE_DO_CALLBACK; | |
| 478 else | |
| 479 write_state_ = WRITE_STATE_WRITE; | |
| 480 | |
| 481 return net::OK; | |
| 482 } | |
| 483 | |
| 484 int CastSocket::DoWriteCallback() { | |
| 485 DCHECK(!write_queue_.empty()); | |
| 486 WriteRequest& request = write_queue_.front(); | |
| 487 int bytes_consumed = request.io_buffer->BytesConsumed(); | |
| 488 | |
| 489 // If inside connection flow, then there should be exaclty one item in | |
| 490 // the write queue. | |
| 491 if (ready_state_ == READY_STATE_CONNECTING) { | |
| 492 write_queue_.pop(); | |
| 493 DCHECK(write_queue_.empty()); | |
| 494 PostTaskToStartConnectLoop(bytes_consumed); | |
| 495 } else { | |
| 496 WriteRequest& request = write_queue_.front(); | |
| 497 request.callback.Run(bytes_consumed); | |
| 498 write_queue_.pop(); | |
| 499 } | |
| 500 write_state_ = WRITE_STATE_WRITE; | |
| 501 return net::OK; | |
| 502 } | |
| 503 | |
| 504 int CastSocket::DoWriteError(int result) { | |
| 505 DCHECK(!write_queue_.empty()); | |
| 506 DCHECK_LT(result, 0); | |
| 507 | |
| 508 // If inside connection flow, then there should be exactly one item in | |
| 509 // the write queue. | |
| 510 if (ready_state_ == READY_STATE_CONNECTING) { | |
| 511 write_queue_.pop(); | |
| 512 DCHECK(write_queue_.empty()); | |
| 513 PostTaskToStartConnectLoop(result); | |
| 514 // Connect loop will handle the error. Return net::OK so that write flow | |
| 515 // does not try to report error also. | |
| 516 return net::OK; | |
| 517 } | |
| 518 | |
| 519 while (!write_queue_.empty()) { | |
| 520 WriteRequest& request = write_queue_.front(); | |
| 521 request.callback.Run(result); | |
| 522 write_queue_.pop(); | |
| 523 } | |
| 524 return net::ERR_FAILED; | |
| 525 } | |
| 526 | |
| 527 void CastSocket::PostTaskToStartReadLoop() { | |
| 528 DCHECK(CalledOnValidThread()); | |
| 529 base::MessageLoop::current()->PostTask( | |
| 530 FROM_HERE, | |
| 531 base::Bind(&CastSocket::StartReadLoop, AsWeakPtr())); | |
| 532 } | |
| 533 | |
| 534 void CastSocket::StartReadLoop() { | |
| 535 // Read loop would have already been started if read state is not NONE | |
| 536 if (read_state_ == READ_STATE_NONE) { | |
| 537 read_state_ = READ_STATE_READ; | |
| 538 DoReadLoop(net::OK); | |
| 539 } | |
| 540 } | |
| 541 | |
| 542 void CastSocket::DoReadLoop(int result) { | |
| 543 DCHECK(CalledOnValidThread()); | |
| 544 // Network operations can either finish synchronously or asynchronously. | |
| 545 // This method executes the state machine transitions in a loop so that | |
| 546 // write state transitions happen even when network operations finish | |
| 547 // synchronously. | |
| 548 int rv = result; | |
| 549 do { | |
| 550 ReadState state = read_state_; | |
| 551 read_state_ = READ_STATE_NONE; | |
| 552 | |
| 553 switch (state) { | |
| 554 case READ_STATE_READ: | |
| 555 rv = DoRead(); | |
| 556 break; | |
| 557 case READ_STATE_READ_COMPLETE: | |
| 558 rv = DoReadComplete(rv); | |
| 559 break; | |
| 560 case READ_STATE_DO_CALLBACK: | |
| 561 rv = DoReadCallback(); | |
| 562 break; | |
| 563 case READ_STATE_ERROR: | |
| 564 rv = DoReadError(rv); | |
| 565 break; | |
| 566 default: | |
| 567 NOTREACHED() << "BUG in read flow. Unknown state: " << state; | |
| 568 break; | |
| 569 } | |
| 570 } while (rv != net::ERR_IO_PENDING && read_state_ != READ_STATE_NONE); | |
| 571 | |
| 572 // Read loop is done - If the result is ERR_FAILED then close with error. | |
| 573 if (rv == net::ERR_FAILED) | |
| 574 CloseWithError(error_state_); | |
| 575 } | |
| 576 | |
| 577 int CastSocket::DoRead() { | |
| 578 read_state_ = READ_STATE_READ_COMPLETE; | |
| 579 // Figure out whether to read header or body, and the remaining bytes. | |
| 580 uint32 num_bytes_to_read = 0; | |
| 581 if (header_read_buffer_->RemainingCapacity() > 0) { | |
| 582 current_read_buffer_ = header_read_buffer_; | |
| 583 num_bytes_to_read = header_read_buffer_->RemainingCapacity(); | |
| 584 DCHECK_LE(num_bytes_to_read, MessageHeader::header_size()); | |
| 585 } else { | |
| 586 DCHECK_GT(current_message_size_, 0U); | |
| 587 num_bytes_to_read = current_message_size_ - body_read_buffer_->offset(); | |
| 588 current_read_buffer_ = body_read_buffer_; | |
| 589 DCHECK_LE(num_bytes_to_read, MessageHeader::max_message_size()); | |
| 590 } | |
| 591 DCHECK_GT(num_bytes_to_read, 0U); | |
| 592 | |
| 593 // Read up to num_bytes_to_read into |current_read_buffer_|. | |
| 594 return socket_->Read( | |
| 595 current_read_buffer_.get(), | |
| 596 num_bytes_to_read, | |
| 597 base::Bind(&CastSocket::DoReadLoop, AsWeakPtr())); | |
| 598 } | |
| 599 | |
| 600 int CastSocket::DoReadComplete(int result) { | |
| 601 VLOG_WITH_CONNECTION(2) << "DoReadComplete result = " << result | |
| 602 << " header offset = " | |
| 603 << header_read_buffer_->offset() | |
| 604 << " body offset = " << body_read_buffer_->offset(); | |
| 605 if (result <= 0) { // 0 means EOF: the peer closed the socket | |
| 606 VLOG_WITH_CONNECTION(1) << "Read error, peer closed the socket"; | |
| 607 error_state_ = CHANNEL_ERROR_SOCKET_ERROR; | |
| 608 read_state_ = READ_STATE_ERROR; | |
| 609 return result == 0 ? net::ERR_FAILED : result; | |
| 610 } | |
| 611 | |
| 612 // Some data was read. Move the offset in the current buffer forward. | |
| 613 DCHECK_LE(current_read_buffer_->offset() + result, | |
| 614 current_read_buffer_->capacity()); | |
| 615 current_read_buffer_->set_offset(current_read_buffer_->offset() + result); | |
| 616 read_state_ = READ_STATE_READ; | |
| 617 | |
| 618 if (current_read_buffer_.get() == header_read_buffer_.get() && | |
| 619 current_read_buffer_->RemainingCapacity() == 0) { | |
| 620 // A full header is read, process the contents. | |
| 621 if (!ProcessHeader()) { | |
| 622 error_state_ = cast_channel::CHANNEL_ERROR_INVALID_MESSAGE; | |
| 623 read_state_ = READ_STATE_ERROR; | |
| 624 } | |
| 625 } else if (current_read_buffer_.get() == body_read_buffer_.get() && | |
| 626 static_cast<uint32>(current_read_buffer_->offset()) == | |
| 627 current_message_size_) { | |
| 628 // Full body is read, process the contents. | |
| 629 if (ProcessBody()) { | |
| 630 read_state_ = READ_STATE_DO_CALLBACK; | |
| 631 } else { | |
| 632 error_state_ = cast_channel::CHANNEL_ERROR_INVALID_MESSAGE; | |
| 633 read_state_ = READ_STATE_ERROR; | |
| 634 } | |
| 635 } | |
| 636 | |
| 637 return net::OK; | |
| 638 } | |
| 639 | |
| 640 int CastSocket::DoReadCallback() { | |
| 641 read_state_ = READ_STATE_READ; | |
| 642 const CastMessage& message = *(current_message_.get()); | |
| 643 if (IsAuthMessage(message)) { | |
| 644 // An auth message is received, check that connect flow is running. | |
| 645 if (ready_state_ == READY_STATE_CONNECTING) { | |
| 646 challenge_reply_.reset(new CastMessage(message)); | |
| 647 PostTaskToStartConnectLoop(net::OK); | |
| 648 } else { | |
| 649 read_state_ = READ_STATE_ERROR; | |
| 650 } | |
| 651 } else if (delegate_) { | |
| 652 MessageInfo message_info; | |
| 653 if (CastMessageToMessageInfo(message, &message_info)) | |
| 654 delegate_->OnMessage(this, message_info); | |
| 655 else | |
| 656 read_state_ = READ_STATE_ERROR; | |
| 657 } | |
| 658 current_message_->Clear(); | |
| 659 return net::OK; | |
| 660 } | |
| 661 | |
| 662 int CastSocket::DoReadError(int result) { | |
| 663 DCHECK_LE(result, 0); | |
| 664 // If inside connection flow, then get back to connect loop. | |
| 665 if (ready_state_ == READY_STATE_CONNECTING) { | |
| 666 PostTaskToStartConnectLoop(result); | |
| 667 // does not try to report error also. | |
| 668 return net::OK; | |
| 669 } | |
| 670 return net::ERR_FAILED; | |
| 671 } | |
| 672 | |
| 673 bool CastSocket::ProcessHeader() { | |
| 674 DCHECK_EQ(static_cast<uint32>(header_read_buffer_->offset()), | |
| 675 MessageHeader::header_size()); | |
| 676 MessageHeader header; | |
| 677 MessageHeader::ReadFromIOBuffer(header_read_buffer_.get(), &header); | |
| 678 if (header.message_size > MessageHeader::max_message_size()) | |
| 679 return false; | |
| 680 | |
| 681 VLOG_WITH_CONNECTION(2) << "Parsed header { message_size: " | |
| 682 << header.message_size << " }"; | |
| 683 current_message_size_ = header.message_size; | |
| 684 return true; | |
| 685 } | |
| 686 | |
| 687 bool CastSocket::ProcessBody() { | |
| 688 DCHECK_EQ(static_cast<uint32>(body_read_buffer_->offset()), | |
| 689 current_message_size_); | |
| 690 if (!current_message_->ParseFromArray( | |
| 691 body_read_buffer_->StartOfBuffer(), current_message_size_)) { | |
| 692 return false; | |
| 693 } | |
| 694 current_message_size_ = 0; | |
| 695 header_read_buffer_->set_offset(0); | |
| 696 body_read_buffer_->set_offset(0); | |
| 697 current_read_buffer_ = header_read_buffer_; | |
| 698 return true; | |
| 699 } | |
| 700 | |
| 701 // static | |
| 702 bool CastSocket::Serialize(const CastMessage& message_proto, | |
| 703 std::string* message_data) { | |
| 704 DCHECK(message_data); | |
| 705 message_proto.SerializeToString(message_data); | |
| 706 size_t message_size = message_data->size(); | |
| 707 if (message_size > MessageHeader::max_message_size()) { | |
| 708 message_data->clear(); | |
| 709 return false; | |
| 710 } | |
| 711 CastSocket::MessageHeader header; | |
| 712 header.SetMessageSize(message_size); | |
| 713 header.PrependToString(message_data); | |
| 714 return true; | |
| 715 } | |
| 716 | |
| 717 void CastSocket::CloseWithError(ChannelError error) { | |
| 718 DCHECK(CalledOnValidThread()); | |
| 719 socket_.reset(NULL); | |
| 720 ready_state_ = READY_STATE_CLOSED; | |
| 721 error_state_ = error; | |
| 722 if (delegate_) | |
| 723 delegate_->OnError(this, error); | |
| 724 } | |
| 725 | |
| 726 std::string CastSocket::CastUrl() const { | |
| 727 return ((channel_auth_ == CHANNEL_AUTH_TYPE_SSL_VERIFIED) ? | |
| 728 "casts://" : "cast://") + ip_endpoint_.ToString(); | |
| 729 } | |
| 730 | |
| 731 bool CastSocket::CalledOnValidThread() const { | |
| 732 return thread_checker_.CalledOnValidThread(); | |
| 733 } | |
| 734 | |
| 735 base::Timer* CastSocket::GetTimer() { | |
| 736 return connect_timeout_timer_.get(); | |
| 737 } | |
| 738 | |
| 739 CastSocket::MessageHeader::MessageHeader() : message_size(0) { } | |
| 740 | |
| 741 void CastSocket::MessageHeader::SetMessageSize(size_t size) { | |
| 742 DCHECK(size < static_cast<size_t>(kuint32max)); | |
| 743 DCHECK(size > 0); | |
| 744 message_size = static_cast<size_t>(size); | |
| 745 } | |
| 746 | |
| 747 // TODO(mfoltz): Investigate replacing header serialization with base::Pickle, | |
| 748 // if bit-for-bit compatible. | |
| 749 void CastSocket::MessageHeader::PrependToString(std::string* str) { | |
| 750 MessageHeader output = *this; | |
| 751 output.message_size = base::HostToNet32(message_size); | |
| 752 size_t header_size = base::checked_cast<size_t,uint32>( | |
| 753 MessageHeader::header_size()); | |
| 754 scoped_ptr<char, base::FreeDeleter> char_array( | |
| 755 static_cast<char*>(malloc(header_size))); | |
| 756 memcpy(char_array.get(), &output, header_size); | |
| 757 str->insert(0, char_array.get(), header_size); | |
| 758 } | |
| 759 | |
| 760 // TODO(mfoltz): Investigate replacing header deserialization with base::Pickle, | |
| 761 // if bit-for-bit compatible. | |
| 762 void CastSocket::MessageHeader::ReadFromIOBuffer( | |
| 763 net::GrowableIOBuffer* buffer, MessageHeader* header) { | |
| 764 uint32 message_size; | |
| 765 size_t header_size = base::checked_cast<size_t,uint32>( | |
| 766 MessageHeader::header_size()); | |
| 767 memcpy(&message_size, buffer->StartOfBuffer(), header_size); | |
| 768 header->message_size = base::NetToHost32(message_size); | |
| 769 } | |
| 770 | |
| 771 std::string CastSocket::MessageHeader::ToString() { | |
| 772 return "{message_size: " + base::UintToString(message_size) + "}"; | |
| 773 } | |
| 774 | |
| 775 CastSocket::WriteRequest::WriteRequest(const net::CompletionCallback& callback) | |
| 776 : callback(callback) { } | |
| 777 | |
| 778 bool CastSocket::WriteRequest::SetContent(const CastMessage& message_proto) { | |
| 779 DCHECK(!io_buffer.get()); | |
| 780 std::string message_data; | |
| 781 if (!Serialize(message_proto, &message_data)) | |
| 782 return false; | |
| 783 io_buffer = new net::DrainableIOBuffer(new net::StringIOBuffer(message_data), | |
| 784 message_data.size()); | |
| 785 return true; | |
| 786 } | |
| 787 | |
| 788 CastSocket::WriteRequest::~WriteRequest() { } | |
| 789 | |
| 790 } // namespace cast_channel | |
| 791 } // namespace api | |
| 792 } // namespace extensions | |
| 793 | |
| 794 #undef VLOG_WITH_CONNECTION | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 395333003:
Extensions: Move cast_channel and hid APIs to extensions/. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src