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