net/socket/socks5_client_socket.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 "net/socket/socks5_client_socket.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/callback_helpers.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/format_macros.h"
  11 #include "base/strings/string_util.h"
  12 #include "base/sys_byteorder.h"
  13 #include "base/trace_event/trace_event.h"
  14 #include "net/base/io_buffer.h"
  15 #include "net/base/net_log.h"
  16 #include "net/base/net_util.h"
  17 #include "net/socket/client_socket_handle.h"
  18
  19 namespace net {
  20
  21 const unsigned int SOCKS5ClientSocket::kGreetReadHeaderSize = 2;
  22 const unsigned int SOCKS5ClientSocket::kWriteHeaderSize = 10;
  23 const unsigned int SOCKS5ClientSocket::kReadHeaderSize = 5;
  24 const uint8 SOCKS5ClientSocket::kSOCKS5Version = 0x05;
  25 const uint8 SOCKS5ClientSocket::kTunnelCommand = 0x01;
  26 const uint8 SOCKS5ClientSocket::kNullByte = 0x00;
  27
  28 static_assert(sizeof(struct in_addr) == 4, "incorrect system size of IPv4");
  29 static_assert(sizeof(struct in6_addr) == 16, "incorrect system size of IPv6");
  30
  31 SOCKS5ClientSocket::SOCKS5ClientSocket(
  32     scoped_ptr<ClientSocketHandle> transport_socket,
  33     const HostResolver::RequestInfo& req_info)
  34     : io_callback_(base::Bind(&SOCKS5ClientSocket::OnIOComplete,
  35                               base::Unretained(this))),
  36       transport_(transport_socket.Pass()),
  37       next_state_(STATE_NONE),
  38       completed_handshake_(false),
  39       bytes_sent_(0),
  40       bytes_received_(0),
  41       read_header_size(kReadHeaderSize),
  42       was_ever_used_(false),
  43       host_request_info_(req_info),
  44       net_log_(transport_->socket()->NetLog()) {
  45 }
  46
  47 SOCKS5ClientSocket::~SOCKS5ClientSocket() {
  48   Disconnect();
  49 }
  50
  51 int SOCKS5ClientSocket::Connect(const CompletionCallback& callback) {
  52   DCHECK(transport_.get());
  53   DCHECK(transport_->socket());
  54   DCHECK_EQ(STATE_NONE, next_state_);
  55   DCHECK(user_callback_.is_null());
  56
  57   // If already connected, then just return OK.
  58   if (completed_handshake_)
  59     return OK;
  60
  61   net_log_.BeginEvent(NetLog::TYPE_SOCKS5_CONNECT);
  62
  63   next_state_ = STATE_GREET_WRITE;
  64   buffer_.clear();
  65
  66   int rv = DoLoop(OK);
  67   if (rv == ERR_IO_PENDING) {
  68     user_callback_ = callback;
  69   } else {
  70     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SOCKS5_CONNECT, rv);
  71   }
  72   return rv;
  73 }
  74
  75 void SOCKS5ClientSocket::Disconnect() {
  76   completed_handshake_ = false;
  77   transport_->socket()->Disconnect();
  78
  79   // Reset other states to make sure they aren't mistakenly used later.
  80   // These are the states initialized by Connect().
  81   next_state_ = STATE_NONE;
  82   user_callback_.Reset();
  83 }
  84
  85 bool SOCKS5ClientSocket::IsConnected() const {
  86   return completed_handshake_ && transport_->socket()->IsConnected();
  87 }
  88
  89 bool SOCKS5ClientSocket::IsConnectedAndIdle() const {
  90   return completed_handshake_ && transport_->socket()->IsConnectedAndIdle();
  91 }
  92
  93 const BoundNetLog& SOCKS5ClientSocket::NetLog() const {
  94   return net_log_;
  95 }
  96
  97 void SOCKS5ClientSocket::SetSubresourceSpeculation() {
  98   if (transport_.get() && transport_->socket()) {
  99     transport_->socket()->SetSubresourceSpeculation();
 100   } else {
 101     NOTREACHED();
 102   }
 103 }
 104
 105 void SOCKS5ClientSocket::SetOmniboxSpeculation() {
 106   if (transport_.get() && transport_->socket()) {
 107     transport_->socket()->SetOmniboxSpeculation();
 108   } else {
 109     NOTREACHED();
 110   }
 111 }
 112
 113 bool SOCKS5ClientSocket::WasEverUsed() const {
 114   return was_ever_used_;
 115 }
 116
 117 bool SOCKS5ClientSocket::UsingTCPFastOpen() const {
 118   if (transport_.get() && transport_->socket()) {
 119     return transport_->socket()->UsingTCPFastOpen();
 120   }
 121   NOTREACHED();
 122   return false;
 123 }
 124
 125 bool SOCKS5ClientSocket::WasNpnNegotiated() const {
 126   if (transport_.get() && transport_->socket()) {
 127     return transport_->socket()->WasNpnNegotiated();
 128   }
 129   NOTREACHED();
 130   return false;
 131 }
 132
 133 NextProto SOCKS5ClientSocket::GetNegotiatedProtocol() const {
 134   if (transport_.get() && transport_->socket()) {
 135     return transport_->socket()->GetNegotiatedProtocol();
 136   }
 137   NOTREACHED();
 138   return kProtoUnknown;
 139 }
 140
 141 bool SOCKS5ClientSocket::GetSSLInfo(SSLInfo* ssl_info) {
 142   if (transport_.get() && transport_->socket()) {
 143     return transport_->socket()->GetSSLInfo(ssl_info);
 144   }
 145   NOTREACHED();
 146   return false;
 147
 148 }
 149
 150 // Read is called by the transport layer above to read. This can only be done
 151 // if the SOCKS handshake is complete.
 152 int SOCKS5ClientSocket::Read(IOBuffer* buf, int buf_len,
 153                              const CompletionCallback& callback) {
 154   DCHECK(completed_handshake_);
 155   DCHECK_EQ(STATE_NONE, next_state_);
 156   DCHECK(user_callback_.is_null());
 157   DCHECK(!callback.is_null());
 158
 159   int rv = transport_->socket()->Read(
 160       buf, buf_len,
 161       base::Bind(&SOCKS5ClientSocket::OnReadWriteComplete,
 162                  base::Unretained(this), callback));
 163   if (rv > 0)
 164     was_ever_used_ = true;
 165   return rv;
 166 }
 167
 168 // Write is called by the transport layer. This can only be done if the
 169 // SOCKS handshake is complete.
 170 int SOCKS5ClientSocket::Write(IOBuffer* buf, int buf_len,
 171                               const CompletionCallback& callback) {
 172   DCHECK(completed_handshake_);
 173   DCHECK_EQ(STATE_NONE, next_state_);
 174   DCHECK(user_callback_.is_null());
 175   DCHECK(!callback.is_null());
 176
 177   int rv = transport_->socket()->Write(
 178       buf, buf_len,
 179       base::Bind(&SOCKS5ClientSocket::OnReadWriteComplete,
 180                  base::Unretained(this), callback));
 181   if (rv > 0)
 182     was_ever_used_ = true;
 183   return rv;
 184 }
 185
 186 int SOCKS5ClientSocket::SetReceiveBufferSize(int32 size) {
 187   return transport_->socket()->SetReceiveBufferSize(size);
 188 }
 189
 190 int SOCKS5ClientSocket::SetSendBufferSize(int32 size) {
 191   return transport_->socket()->SetSendBufferSize(size);
 192 }
 193
 194 void SOCKS5ClientSocket::DoCallback(int result) {
 195   DCHECK_NE(ERR_IO_PENDING, result);
 196   DCHECK(!user_callback_.is_null());
 197
 198   // Since Run() may result in Read being called,
 199   // clear user_callback_ up front.
 200   base::ResetAndReturn(&user_callback_).Run(result);
 201 }
 202
 203 void SOCKS5ClientSocket::OnIOComplete(int result) {
 204   DCHECK_NE(STATE_NONE, next_state_);
 205   int rv = DoLoop(result);
 206   if (rv != ERR_IO_PENDING) {
 207     net_log_.EndEvent(NetLog::TYPE_SOCKS5_CONNECT);
 208     DoCallback(rv);
 209   }
 210 }
 211
 212 void SOCKS5ClientSocket::OnReadWriteComplete(const CompletionCallback& callback,
 213                                              int result) {
 214   DCHECK_NE(ERR_IO_PENDING, result);
 215   DCHECK(!callback.is_null());
 216
 217   if (result > 0)
 218     was_ever_used_ = true;
 219   callback.Run(result);
 220 }
 221
 222 int SOCKS5ClientSocket::DoLoop(int last_io_result) {
 223   DCHECK_NE(next_state_, STATE_NONE);
 224   int rv = last_io_result;
 225   do {
 226     State state = next_state_;
 227     next_state_ = STATE_NONE;
 228     switch (state) {
 229       case STATE_GREET_WRITE:
 230         DCHECK_EQ(OK, rv);
 231         net_log_.BeginEvent(NetLog::TYPE_SOCKS5_GREET_WRITE);
 232         rv = DoGreetWrite();
 233         break;
 234       case STATE_GREET_WRITE_COMPLETE:
 235         rv = DoGreetWriteComplete(rv);
 236         net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SOCKS5_GREET_WRITE, rv);
 237         break;
 238       case STATE_GREET_READ:
 239         DCHECK_EQ(OK, rv);
 240         net_log_.BeginEvent(NetLog::TYPE_SOCKS5_GREET_READ);
 241         rv = DoGreetRead();
 242         break;
 243       case STATE_GREET_READ_COMPLETE:
 244         rv = DoGreetReadComplete(rv);
 245         net_log_.EndEventWithNetErrorCode(NetLog::TYPE_SOCKS5_GREET_READ, rv);
 246         break;
 247       case STATE_HANDSHAKE_WRITE:
 248         DCHECK_EQ(OK, rv);
 249         net_log_.BeginEvent(NetLog::TYPE_SOCKS5_HANDSHAKE_WRITE);
 250         rv = DoHandshakeWrite();
 251         break;
 252       case STATE_HANDSHAKE_WRITE_COMPLETE:
 253         rv = DoHandshakeWriteComplete(rv);
 254         net_log_.EndEventWithNetErrorCode(
 255             NetLog::TYPE_SOCKS5_HANDSHAKE_WRITE, rv);
 256         break;
 257       case STATE_HANDSHAKE_READ:
 258         DCHECK_EQ(OK, rv);
 259         net_log_.BeginEvent(NetLog::TYPE_SOCKS5_HANDSHAKE_READ);
 260         rv = DoHandshakeRead();
 261         break;
 262       case STATE_HANDSHAKE_READ_COMPLETE:
 263         rv = DoHandshakeReadComplete(rv);
 264         net_log_.EndEventWithNetErrorCode(
 265             NetLog::TYPE_SOCKS5_HANDSHAKE_READ, rv);
 266         break;
 267       default:
 268         NOTREACHED() << "bad state";
 269         rv = ERR_UNEXPECTED;
 270         break;
 271     }
 272   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 273   return rv;
 274 }
 275
 276 const char kSOCKS5GreetWriteData[] = { 0x05, 0x01, 0x00 };  // no authentication
 277
 278 int SOCKS5ClientSocket::DoGreetWrite() {
 279   // Since we only have 1 byte to send the hostname length in, if the
 280   // URL has a hostname longer than 255 characters we can't send it.
 281   if (0xFF < host_request_info_.hostname().size()) {
 282     net_log_.AddEvent(NetLog::TYPE_SOCKS_HOSTNAME_TOO_BIG);
 283     return ERR_SOCKS_CONNECTION_FAILED;
 284   }
 285
 286   if (buffer_.empty()) {
 287     buffer_ = std::string(kSOCKS5GreetWriteData,
 288                           arraysize(kSOCKS5GreetWriteData));
 289     bytes_sent_ = 0;
 290   }
 291
 292   next_state_ = STATE_GREET_WRITE_COMPLETE;
 293   size_t handshake_buf_len = buffer_.size() - bytes_sent_;
 294   handshake_buf_ = new IOBuffer(handshake_buf_len);
 295   memcpy(handshake_buf_->data(), &buffer_.data()[bytes_sent_],
 296          handshake_buf_len);
 297   return transport_->socket()
 298       ->Write(handshake_buf_.get(), handshake_buf_len, io_callback_);
 299 }
 300
 301 int SOCKS5ClientSocket::DoGreetWriteComplete(int result) {
 302   if (result < 0)
 303     return result;
 304
 305   bytes_sent_ += result;
 306   if (bytes_sent_ == buffer_.size()) {
 307     buffer_.clear();
 308     bytes_received_ = 0;
 309     next_state_ = STATE_GREET_READ;
 310   } else {
 311     next_state_ = STATE_GREET_WRITE;
 312   }
 313   return OK;
 314 }
 315
 316 int SOCKS5ClientSocket::DoGreetRead() {
 317   next_state_ = STATE_GREET_READ_COMPLETE;
 318   size_t handshake_buf_len = kGreetReadHeaderSize - bytes_received_;
 319   handshake_buf_ = new IOBuffer(handshake_buf_len);
 320   return transport_->socket()
 321       ->Read(handshake_buf_.get(), handshake_buf_len, io_callback_);
 322 }
 323
 324 int SOCKS5ClientSocket::DoGreetReadComplete(int result) {
 325   if (result < 0)
 326     return result;
 327
 328   if (result == 0) {
 329     net_log_.AddEvent(NetLog::TYPE_SOCKS_UNEXPECTEDLY_CLOSED_DURING_GREETING);
 330     return ERR_SOCKS_CONNECTION_FAILED;
 331   }
 332
 333   bytes_received_ += result;
 334   buffer_.append(handshake_buf_->data(), result);
 335   if (bytes_received_ < kGreetReadHeaderSize) {
 336     next_state_ = STATE_GREET_READ;
 337     return OK;
 338   }
 339
 340   // Got the greet data.
 341   if (buffer_[0] != kSOCKS5Version) {
 342     net_log_.AddEvent(NetLog::TYPE_SOCKS_UNEXPECTED_VERSION,
 343                       NetLog::IntegerCallback("version", buffer_[0]));
 344     return ERR_SOCKS_CONNECTION_FAILED;
 345   }
 346   if (buffer_[1] != 0x00) {
 347     net_log_.AddEvent(NetLog::TYPE_SOCKS_UNEXPECTED_AUTH,
 348                       NetLog::IntegerCallback("method", buffer_[1]));
 349     return ERR_SOCKS_CONNECTION_FAILED;
 350   }
 351
 352   buffer_.clear();
 353   next_state_ = STATE_HANDSHAKE_WRITE;
 354   return OK;
 355 }
 356
 357 int SOCKS5ClientSocket::BuildHandshakeWriteBuffer(std::string* handshake)
 358     const {
 359   DCHECK(handshake->empty());
 360
 361   handshake->push_back(kSOCKS5Version);
 362   handshake->push_back(kTunnelCommand);  // Connect command
 363   handshake->push_back(kNullByte);  // Reserved null
 364
 365   handshake->push_back(kEndPointDomain);  // The type of the address.
 366
 367   DCHECK_GE(static_cast<size_t>(0xFF), host_request_info_.hostname().size());
 368
 369   // First add the size of the hostname, followed by the hostname.
 370   handshake->push_back(static_cast<unsigned char>(
 371       host_request_info_.hostname().size()));
 372   handshake->append(host_request_info_.hostname());
 373
 374   uint16 nw_port = base::HostToNet16(host_request_info_.port());
 375   handshake->append(reinterpret_cast<char*>(&nw_port), sizeof(nw_port));
 376   return OK;
 377 }
 378
 379 // Writes the SOCKS handshake data to the underlying socket connection.
 380 int SOCKS5ClientSocket::DoHandshakeWrite() {
 381   next_state_ = STATE_HANDSHAKE_WRITE_COMPLETE;
 382
 383   if (buffer_.empty()) {
 384     int rv = BuildHandshakeWriteBuffer(&buffer_);
 385     if (rv != OK)
 386       return rv;
 387     bytes_sent_ = 0;
 388   }
 389
 390   int handshake_buf_len = buffer_.size() - bytes_sent_;
 391   DCHECK_LT(0, handshake_buf_len);
 392   handshake_buf_ = new IOBuffer(handshake_buf_len);
 393   memcpy(handshake_buf_->data(), &buffer_[bytes_sent_],
 394          handshake_buf_len);
 395   return transport_->socket()
 396       ->Write(handshake_buf_.get(), handshake_buf_len, io_callback_);
 397 }
 398
 399 int SOCKS5ClientSocket::DoHandshakeWriteComplete(int result) {
 400   if (result < 0)
 401     return result;
 402
 403   // We ignore the case when result is 0, since the underlying Write
 404   // may return spurious writes while waiting on the socket.
 405
 406   bytes_sent_ += result;
 407   if (bytes_sent_ == buffer_.size()) {
 408     next_state_ = STATE_HANDSHAKE_READ;
 409     buffer_.clear();
 410   } else if (bytes_sent_ < buffer_.size()) {
 411     next_state_ = STATE_HANDSHAKE_WRITE;
 412   } else {
 413     NOTREACHED();
 414   }
 415
 416   return OK;
 417 }
 418
 419 int SOCKS5ClientSocket::DoHandshakeRead() {
 420   next_state_ = STATE_HANDSHAKE_READ_COMPLETE;
 421
 422   if (buffer_.empty()) {
 423     bytes_received_ = 0;
 424     read_header_size = kReadHeaderSize;
 425   }
 426
 427   int handshake_buf_len = read_header_size - bytes_received_;
 428   handshake_buf_ = new IOBuffer(handshake_buf_len);
 429   return transport_->socket()
 430       ->Read(handshake_buf_.get(), handshake_buf_len, io_callback_);
 431 }
 432
 433 int SOCKS5ClientSocket::DoHandshakeReadComplete(int result) {
 434   if (result < 0)
 435     return result;
 436
 437   // The underlying socket closed unexpectedly.
 438   if (result == 0) {
 439     net_log_.AddEvent(NetLog::TYPE_SOCKS_UNEXPECTEDLY_CLOSED_DURING_HANDSHAKE);
 440     return ERR_SOCKS_CONNECTION_FAILED;
 441   }
 442
 443   buffer_.append(handshake_buf_->data(), result);
 444   bytes_received_ += result;
 445
 446   // When the first few bytes are read, check how many more are required
 447   // and accordingly increase them
 448   if (bytes_received_ == kReadHeaderSize) {
 449     if (buffer_[0] != kSOCKS5Version || buffer_[2] != kNullByte) {
 450       net_log_.AddEvent(NetLog::TYPE_SOCKS_UNEXPECTED_VERSION,
 451                         NetLog::IntegerCallback("version", buffer_[0]));
 452       return ERR_SOCKS_CONNECTION_FAILED;
 453     }
 454     if (buffer_[1] != 0x00) {
 455       net_log_.AddEvent(NetLog::TYPE_SOCKS_SERVER_ERROR,
 456                         NetLog::IntegerCallback("error_code", buffer_[1]));
 457       return ERR_SOCKS_CONNECTION_FAILED;
 458     }
 459
 460     // We check the type of IP/Domain the server returns and accordingly
 461     // increase the size of the response. For domains, we need to read the
 462     // size of the domain, so the initial request size is upto the domain
 463     // size. Since for IPv4/IPv6 the size is fixed and hence no 'size' is
 464     // read, we substract 1 byte from the additional request size.
 465     SocksEndPointAddressType address_type =
 466         static_cast<SocksEndPointAddressType>(buffer_[3]);
 467     if (address_type == kEndPointDomain)
 468       read_header_size += static_cast<uint8>(buffer_[4]);
 469     else if (address_type == kEndPointResolvedIPv4)
 470       read_header_size += sizeof(struct in_addr) - 1;
 471     else if (address_type == kEndPointResolvedIPv6)
 472       read_header_size += sizeof(struct in6_addr) - 1;
 473     else {
 474       net_log_.AddEvent(NetLog::TYPE_SOCKS_UNKNOWN_ADDRESS_TYPE,
 475                         NetLog::IntegerCallback("address_type", buffer_[3]));
 476       return ERR_SOCKS_CONNECTION_FAILED;
 477     }
 478
 479     read_header_size += 2;  // for the port.
 480     next_state_ = STATE_HANDSHAKE_READ;
 481     return OK;
 482   }
 483
 484   // When the final bytes are read, setup handshake. We ignore the rest
 485   // of the response since they represent the SOCKSv5 endpoint and have
 486   // no use when doing a tunnel connection.
 487   if (bytes_received_ == read_header_size) {
 488     completed_handshake_ = true;
 489     buffer_.clear();
 490     next_state_ = STATE_NONE;
 491     return OK;
 492   }
 493
 494   next_state_ = STATE_HANDSHAKE_READ;
 495   return OK;
 496 }
 497
 498 int SOCKS5ClientSocket::GetPeerAddress(IPEndPoint* address) const {
 499   return transport_->socket()->GetPeerAddress(address);
 500 }
 501
 502 int SOCKS5ClientSocket::GetLocalAddress(IPEndPoint* address) const {
 503   return transport_->socket()->GetLocalAddress(address);
 504 }
 505
 506 }  // namespace net