content/browser/renderer_host/p2p/socket_host_tcp.cc

   1 // Copyright (c) 2012 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 "content/browser/renderer_host/p2p/socket_host_tcp.h"
   6
   7 #include "base/sys_byteorder.h"
   8 #include "content/common/p2p_messages.h"
   9 #include "ipc/ipc_sender.h"
  10 #include "jingle/glue/fake_ssl_client_socket.h"
  11 #include "jingle/glue/proxy_resolving_client_socket.h"
  12 #include "net/base/io_buffer.h"
  13 #include "net/base/net_errors.h"
  14 #include "net/base/net_util.h"
  15 #include "net/socket/client_socket_factory.h"
  16 #include "net/socket/client_socket_handle.h"
  17 #include "net/socket/ssl_client_socket.h"
  18 #include "net/socket/tcp_client_socket.h"
  19 #include "net/url_request/url_request_context.h"
  20 #include "net/url_request/url_request_context_getter.h"
  21
  22 namespace {
  23
  24 typedef uint16 PacketLength;
  25 const int kPacketHeaderSize = sizeof(PacketLength);
  26 const int kReadBufferSize = 4096;
  27 const int kPacketLengthOffset = 2;
  28 const int kTurnChannelDataHeaderSize = 4;
  29 const int kRecvSocketBufferSize = 128 * 1024;
  30 const int kSendSocketBufferSize = 128 * 1024;
  31
  32 bool IsTlsClientSocket(content::P2PSocketType type) {
  33   return (type == content::P2P_SOCKET_STUN_TLS_CLIENT ||
  34           type == content::P2P_SOCKET_TLS_CLIENT);
  35 }
  36
  37 bool IsPseudoTlsClientSocket(content::P2PSocketType type) {
  38   return (type == content::P2P_SOCKET_SSLTCP_CLIENT ||
  39           type == content::P2P_SOCKET_STUN_SSLTCP_CLIENT);
  40 }
  41
  42 }  // namespace
  43
  44 namespace content {
  45
  46 P2PSocketHostTcpBase::P2PSocketHostTcpBase(
  47     IPC::Sender* message_sender, int id,
  48     P2PSocketType type, net::URLRequestContextGetter* url_context)
  49     : P2PSocketHost(message_sender, id),
  50       write_pending_(false),
  51       connected_(false),
  52       type_(type),
  53       url_context_(url_context) {
  54 }
  55
  56 P2PSocketHostTcpBase::~P2PSocketHostTcpBase() {
  57   if (state_ == STATE_OPEN) {
  58     DCHECK(socket_.get());
  59     socket_.reset();
  60   }
  61 }
  62
  63 bool P2PSocketHostTcpBase::InitAccepted(const net::IPEndPoint& remote_address,
  64                                         net::StreamSocket* socket) {
  65   DCHECK(socket);
  66   DCHECK_EQ(state_, STATE_UNINITIALIZED);
  67
  68   remote_address_ = remote_address;
  69   // TODO(ronghuawu): Add FakeSSLServerSocket.
  70   socket_.reset(socket);
  71   state_ = STATE_OPEN;
  72   DoRead();
  73   return state_ != STATE_ERROR;
  74 }
  75
  76 bool P2PSocketHostTcpBase::Init(const net::IPEndPoint& local_address,
  77                                 const net::IPEndPoint& remote_address) {
  78   DCHECK_EQ(state_, STATE_UNINITIALIZED);
  79
  80   remote_address_ = remote_address;
  81   state_ = STATE_CONNECTING;
  82
  83   net::HostPortPair dest_host_port_pair =
  84       net::HostPortPair::FromIPEndPoint(remote_address);
  85   // TODO(mallinath) - We are ignoring local_address altogether. We should
  86   // find a way to inject this into ProxyResolvingClientSocket. This could be
  87   // a problem on multi-homed host.
  88
  89   // The default SSLConfig is good enough for us for now.
  90   const net::SSLConfig ssl_config;
  91   socket_.reset(new jingle_glue::ProxyResolvingClientSocket(
  92                     NULL,     // Default socket pool provided by the net::Proxy.
  93                     url_context_,
  94                     ssl_config,
  95                     dest_host_port_pair));
  96
  97   int status = socket_->Connect(
  98       base::Bind(&P2PSocketHostTcpBase::OnConnected,
  99                  base::Unretained(this)));
 100   if (status != net::ERR_IO_PENDING) {
 101     // We defer execution of ProcessConnectDone instead of calling it
 102     // directly here as the caller may not expect an error/close to
 103     // happen here.  This is okay, as from the caller's point of view,
 104     // the connect always happens asynchronously.
 105     base::MessageLoop* message_loop = base::MessageLoop::current();
 106     CHECK(message_loop);
 107     message_loop->PostTask(
 108         FROM_HERE,
 109         base::Bind(&P2PSocketHostTcpBase::OnConnected,
 110                    base::Unretained(this), status));
 111   }
 112
 113   return state_ != STATE_ERROR;
 114 }
 115
 116 void P2PSocketHostTcpBase::OnError() {
 117   socket_.reset();
 118
 119   if (state_ == STATE_UNINITIALIZED || state_ == STATE_CONNECTING ||
 120       state_ == STATE_TLS_CONNECTING || state_ == STATE_OPEN) {
 121     message_sender_->Send(new P2PMsg_OnError(id_));
 122   }
 123
 124   state_ = STATE_ERROR;
 125 }
 126
 127 void P2PSocketHostTcpBase::OnConnected(int result) {
 128   DCHECK_EQ(state_, STATE_CONNECTING);
 129   DCHECK_NE(result, net::ERR_IO_PENDING);
 130
 131   if (result != net::OK) {
 132     OnError();
 133     return;
 134   }
 135
 136   if (IsTlsClientSocket(type_)) {
 137     state_ = STATE_TLS_CONNECTING;
 138     StartTls();
 139   } else if (IsPseudoTlsClientSocket(type_)) {
 140     scoped_ptr<net::StreamSocket> transport_socket = socket_.Pass();
 141     socket_.reset(
 142         new jingle_glue::FakeSSLClientSocket(transport_socket.Pass()));
 143     state_ = STATE_TLS_CONNECTING;
 144     int status = socket_->Connect(
 145         base::Bind(&P2PSocketHostTcpBase::ProcessTlsSslConnectDone,
 146                    base::Unretained(this)));
 147     if (status != net::ERR_IO_PENDING) {
 148       ProcessTlsSslConnectDone(status);
 149     }
 150   } else {
 151     // If we are not doing TLS, we are ready to send data now.
 152     // In case of TLS, SignalConnect will be sent only after TLS handshake is
 153     // successfull. So no buffering will be done at socket handlers if any
 154     // packets sent before that by the application.
 155     OnOpen();
 156   }
 157 }
 158
 159 void P2PSocketHostTcpBase::StartTls() {
 160   DCHECK_EQ(state_, STATE_TLS_CONNECTING);
 161   DCHECK(socket_.get());
 162
 163   scoped_ptr<net::ClientSocketHandle> socket_handle(
 164       new net::ClientSocketHandle());
 165   socket_handle->SetSocket(socket_.Pass());
 166
 167   net::SSLClientSocketContext context;
 168   context.cert_verifier = url_context_->GetURLRequestContext()->cert_verifier();
 169   context.transport_security_state =
 170       url_context_->GetURLRequestContext()->transport_security_state();
 171   DCHECK(context.transport_security_state);
 172
 173   // Default ssl config.
 174   const net::SSLConfig ssl_config;
 175   net::HostPortPair dest_host_port_pair =
 176       net::HostPortPair::FromIPEndPoint(remote_address_);
 177   net::ClientSocketFactory* socket_factory =
 178       net::ClientSocketFactory::GetDefaultFactory();
 179   DCHECK(socket_factory);
 180
 181   socket_ = socket_factory->CreateSSLClientSocket(
 182       socket_handle.Pass(), dest_host_port_pair, ssl_config, context);
 183   int status = socket_->Connect(
 184       base::Bind(&P2PSocketHostTcpBase::ProcessTlsSslConnectDone,
 185                  base::Unretained(this)));
 186   if (status != net::ERR_IO_PENDING) {
 187     ProcessTlsSslConnectDone(status);
 188   }
 189 }
 190
 191 void P2PSocketHostTcpBase::ProcessTlsSslConnectDone(int status) {
 192   DCHECK_NE(status, net::ERR_IO_PENDING);
 193   DCHECK_EQ(state_, STATE_TLS_CONNECTING);
 194   if (status != net::OK) {
 195     OnError();
 196     return;
 197   }
 198   OnOpen();
 199 }
 200
 201 void P2PSocketHostTcpBase::OnOpen() {
 202   state_ = STATE_OPEN;
 203   // Setting socket send and receive buffer size.
 204   if (!socket_->SetReceiveBufferSize(kRecvSocketBufferSize)) {
 205     LOG(WARNING) << "Failed to set socket receive buffer size to "
 206                  << kRecvSocketBufferSize;
 207   }
 208
 209   if (!socket_->SetSendBufferSize(kSendSocketBufferSize)) {
 210     LOG(WARNING) << "Failed to set socket send buffer size to "
 211                  << kSendSocketBufferSize;
 212   }
 213
 214   DoSendSocketCreateMsg();
 215   DoRead();
 216 }
 217
 218 void P2PSocketHostTcpBase::DoSendSocketCreateMsg() {
 219   DCHECK(socket_.get());
 220
 221   net::IPEndPoint address;
 222   int result = socket_->GetLocalAddress(&address);
 223   if (result < 0) {
 224     LOG(ERROR) << "P2PSocketHostTcpBase::OnConnected: unable to get local"
 225                << " address: " << result;
 226     OnError();
 227     return;
 228   }
 229
 230   VLOG(1) << "Local address: " << address.ToString();
 231
 232   // If we are not doing TLS, we are ready to send data now.
 233   // In case of TLS SignalConnect will be sent only after TLS handshake is
 234   // successfull. So no buffering will be done at socket handlers if any
 235   // packets sent before that by the application.
 236   message_sender_->Send(new P2PMsg_OnSocketCreated(id_, address));
 237 }
 238
 239 void P2PSocketHostTcpBase::DoRead() {
 240   int result;
 241   do {
 242     if (!read_buffer_.get()) {
 243       read_buffer_ = new net::GrowableIOBuffer();
 244       read_buffer_->SetCapacity(kReadBufferSize);
 245     } else if (read_buffer_->RemainingCapacity() < kReadBufferSize) {
 246       // Make sure that we always have at least kReadBufferSize of
 247       // remaining capacity in the read buffer. Normally all packets
 248       // are smaller than kReadBufferSize, so this is not really
 249       // required.
 250       read_buffer_->SetCapacity(read_buffer_->capacity() + kReadBufferSize -
 251                                 read_buffer_->RemainingCapacity());
 252     }
 253     result = socket_->Read(
 254         read_buffer_.get(),
 255         read_buffer_->RemainingCapacity(),
 256         base::Bind(&P2PSocketHostTcp::OnRead, base::Unretained(this)));
 257     DidCompleteRead(result);
 258   } while (result > 0);
 259 }
 260
 261 void P2PSocketHostTcpBase::OnRead(int result) {
 262   DidCompleteRead(result);
 263   if (state_ == STATE_OPEN) {
 264     DoRead();
 265   }
 266 }
 267
 268 void P2PSocketHostTcpBase::OnPacket(const std::vector<char>& data) {
 269   if (!connected_) {
 270     P2PSocketHost::StunMessageType type;
 271     bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
 272     if (stun && IsRequestOrResponse(type)) {
 273       connected_ = true;
 274     } else if (!stun || type == STUN_DATA_INDICATION) {
 275       LOG(ERROR) << "Received unexpected data packet from "
 276                  << remote_address_.ToString()
 277                  << " before STUN binding is finished. "
 278                  << "Terminating connection.";
 279       OnError();
 280       return;
 281     }
 282   }
 283
 284   message_sender_->Send(new P2PMsg_OnDataReceived(id_, remote_address_, data));
 285 }
 286
 287 // Note: dscp is not actually used on TCP sockets as this point,
 288 // but may be honored in the future.
 289 void P2PSocketHostTcpBase::Send(const net::IPEndPoint& to,
 290                                 const std::vector<char>& data,
 291                                 net::DiffServCodePoint dscp,
 292                                 uint64 packet_id) {
 293   if (!socket_) {
 294     // The Send message may be sent after the an OnError message was
 295     // sent by hasn't been processed the renderer.
 296     return;
 297   }
 298
 299   if (!(to == remote_address_)) {
 300     // Renderer should use this socket only to send data to |remote_address_|.
 301     NOTREACHED();
 302     OnError();
 303     return;
 304   }
 305
 306   if (!connected_) {
 307     P2PSocketHost::StunMessageType type = P2PSocketHost::StunMessageType();
 308     bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
 309     if (!stun || type == STUN_DATA_INDICATION) {
 310       LOG(ERROR) << "Page tried to send a data packet to " << to.ToString()
 311                  << " before STUN binding is finished.";
 312       OnError();
 313       return;
 314     }
 315   }
 316
 317   DoSend(to, data);
 318 }
 319
 320 void P2PSocketHostTcpBase::WriteOrQueue(
 321     scoped_refptr<net::DrainableIOBuffer>& buffer) {
 322   if (write_buffer_.get()) {
 323     write_queue_.push(buffer);
 324     return;
 325   }
 326
 327   write_buffer_ = buffer;
 328   DoWrite();
 329 }
 330
 331 void P2PSocketHostTcpBase::DoWrite() {
 332   while (write_buffer_.get() && state_ == STATE_OPEN && !write_pending_) {
 333     int result = socket_->Write(
 334         write_buffer_.get(),
 335         write_buffer_->BytesRemaining(),
 336         base::Bind(&P2PSocketHostTcp::OnWritten, base::Unretained(this)));
 337     HandleWriteResult(result);
 338   }
 339 }
 340
 341 void P2PSocketHostTcpBase::OnWritten(int result) {
 342   DCHECK(write_pending_);
 343   DCHECK_NE(result, net::ERR_IO_PENDING);
 344
 345   write_pending_ = false;
 346   HandleWriteResult(result);
 347   DoWrite();
 348 }
 349
 350 void P2PSocketHostTcpBase::HandleWriteResult(int result) {
 351   DCHECK(write_buffer_.get());
 352   if (result >= 0) {
 353     write_buffer_->DidConsume(result);
 354     if (write_buffer_->BytesRemaining() == 0) {
 355       message_sender_->Send(new P2PMsg_OnSendComplete(id_));
 356       if (write_queue_.empty()) {
 357         write_buffer_ = NULL;
 358       } else {
 359         write_buffer_ = write_queue_.front();
 360         write_queue_.pop();
 361       }
 362     }
 363   } else if (result == net::ERR_IO_PENDING) {
 364     write_pending_ = true;
 365   } else {
 366     LOG(ERROR) << "Error when sending data in TCP socket: " << result;
 367     OnError();
 368   }
 369 }
 370
 371 P2PSocketHost* P2PSocketHostTcpBase::AcceptIncomingTcpConnection(
 372     const net::IPEndPoint& remote_address, int id) {
 373   NOTREACHED();
 374   OnError();
 375   return NULL;
 376 }
 377
 378 void P2PSocketHostTcpBase::DidCompleteRead(int result) {
 379   DCHECK_EQ(state_, STATE_OPEN);
 380
 381   if (result == net::ERR_IO_PENDING) {
 382     return;
 383   } else if (result < 0) {
 384     LOG(ERROR) << "Error when reading from TCP socket: " << result;
 385     OnError();
 386     return;
 387   }
 388
 389   read_buffer_->set_offset(read_buffer_->offset() + result);
 390   char* head = read_buffer_->StartOfBuffer();  // Purely a convenience.
 391   int pos = 0;
 392   while (pos <= read_buffer_->offset() && state_ == STATE_OPEN) {
 393     int consumed = ProcessInput(head + pos, read_buffer_->offset() - pos);
 394     if (!consumed)
 395       break;
 396     pos += consumed;
 397   }
 398   // We've consumed all complete packets from the buffer; now move any remaining
 399   // bytes to the head of the buffer and set offset to reflect this.
 400   if (pos && pos <= read_buffer_->offset()) {
 401     memmove(head, head + pos, read_buffer_->offset() - pos);
 402     read_buffer_->set_offset(read_buffer_->offset() - pos);
 403   }
 404 }
 405
 406 P2PSocketHostTcp::P2PSocketHostTcp(
 407     IPC::Sender* message_sender, int id,
 408     P2PSocketType type, net::URLRequestContextGetter* url_context)
 409     : P2PSocketHostTcpBase(message_sender, id, type, url_context) {
 410   DCHECK(type == P2P_SOCKET_TCP_CLIENT ||
 411          type == P2P_SOCKET_SSLTCP_CLIENT ||
 412          type == P2P_SOCKET_TLS_CLIENT);
 413 }
 414
 415 P2PSocketHostTcp::~P2PSocketHostTcp() {
 416 }
 417
 418 int P2PSocketHostTcp::ProcessInput(char* input, int input_len) {
 419   if (input_len < kPacketHeaderSize)
 420     return 0;
 421   int packet_size = base::NetToHost16(*reinterpret_cast<uint16*>(input));
 422   if (input_len < packet_size + kPacketHeaderSize)
 423     return 0;
 424
 425   int consumed = kPacketHeaderSize;
 426   char* cur = input + consumed;
 427   std::vector<char> data(cur, cur + packet_size);
 428   OnPacket(data);
 429   consumed += packet_size;
 430   return consumed;
 431 }
 432
 433 void P2PSocketHostTcp::DoSend(const net::IPEndPoint& to,
 434                               const std::vector<char>& data) {
 435   int size = kPacketHeaderSize + data.size();
 436   scoped_refptr<net::DrainableIOBuffer> buffer =
 437       new net::DrainableIOBuffer(new net::IOBuffer(size), size);
 438   *reinterpret_cast<uint16*>(buffer->data()) = base::HostToNet16(data.size());
 439   memcpy(buffer->data() + kPacketHeaderSize, &data[0], data.size());
 440
 441   WriteOrQueue(buffer);
 442 }
 443
 444 // P2PSocketHostStunTcp
 445 P2PSocketHostStunTcp::P2PSocketHostStunTcp(
 446     IPC::Sender* message_sender, int id,
 447     P2PSocketType type, net::URLRequestContextGetter* url_context)
 448     : P2PSocketHostTcpBase(message_sender, id, type, url_context) {
 449   DCHECK(type == P2P_SOCKET_STUN_TCP_CLIENT ||
 450          type == P2P_SOCKET_STUN_SSLTCP_CLIENT ||
 451          type == P2P_SOCKET_STUN_TLS_CLIENT);
 452 }
 453
 454 P2PSocketHostStunTcp::~P2PSocketHostStunTcp() {
 455 }
 456
 457 int P2PSocketHostStunTcp::ProcessInput(char* input, int input_len) {
 458   if (input_len < kPacketHeaderSize + kPacketLengthOffset)
 459     return 0;
 460
 461   int pad_bytes;
 462   int packet_size = GetExpectedPacketSize(
 463       input, input_len, &pad_bytes);
 464
 465   if (input_len < packet_size + pad_bytes)
 466     return 0;
 467
 468   // We have a complete packet. Read through it.
 469   int consumed = 0;
 470   char* cur = input;
 471   std::vector<char> data(cur, cur + packet_size);
 472   OnPacket(data);
 473   consumed += packet_size;
 474   consumed += pad_bytes;
 475   return consumed;
 476 }
 477
 478 void P2PSocketHostStunTcp::DoSend(const net::IPEndPoint& to,
 479                                   const std::vector<char>& data) {
 480   // Each packet is expected to have header (STUN/TURN ChannelData), where
 481   // header contains message type and and length of message.
 482   if (data.size() < kPacketHeaderSize + kPacketLengthOffset) {
 483     NOTREACHED();
 484     OnError();
 485     return;
 486   }
 487
 488   int pad_bytes;
 489   size_t expected_len = GetExpectedPacketSize(
 490       &data[0], data.size(), &pad_bytes);
 491
 492   // Accepts only complete STUN/TURN packets.
 493   if (data.size() != expected_len) {
 494     NOTREACHED();
 495     OnError();
 496     return;
 497   }
 498
 499   // Add any pad bytes to the total size.
 500   int size = data.size() + pad_bytes;
 501
 502   scoped_refptr<net::DrainableIOBuffer> buffer =
 503       new net::DrainableIOBuffer(new net::IOBuffer(size), size);
 504   memcpy(buffer->data(), &data[0], data.size());
 505
 506   if (pad_bytes) {
 507     char padding[4] = {0};
 508     DCHECK_LE(pad_bytes, 4);
 509     memcpy(buffer->data() + data.size(), padding, pad_bytes);
 510   }
 511   WriteOrQueue(buffer);
 512 }
 513
 514 int P2PSocketHostStunTcp::GetExpectedPacketSize(
 515     const char* data, int len, int* pad_bytes) {
 516   DCHECK_LE(kTurnChannelDataHeaderSize, len);
 517   // Both stun and turn had length at offset 2.
 518   int packet_size = base::NetToHost16(*reinterpret_cast<const uint16*>(
 519       data + kPacketLengthOffset));
 520
 521   // Get packet type (STUN or TURN).
 522   uint16 msg_type = base::NetToHost16(*reinterpret_cast<const uint16*>(data));
 523
 524   *pad_bytes = 0;
 525   // Add heder length to packet length.
 526   if ((msg_type & 0xC000) == 0) {
 527     packet_size += kStunHeaderSize;
 528   } else {
 529     packet_size += kTurnChannelDataHeaderSize;
 530     // Calculate any padding if present.
 531     if (packet_size % 4)
 532       *pad_bytes = 4 - packet_size % 4;
 533   }
 534   return packet_size;
 535 }
 536
 537 }  // namespace content