net/socket/tcp_client_socket.cc

   1 // Copyright (c) 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 "net/socket/tcp_client_socket.h"
   6
   7 #include "base/callback_helpers.h"
   8 #include "base/logging.h"
   9 #include "net/base/io_buffer.h"
  10 #include "net/base/ip_endpoint.h"
  11 #include "net/base/net_errors.h"
  12 #include "net/base/net_util.h"
  13
  14 namespace net {
  15
  16 TCPClientSocket::TCPClientSocket(const AddressList& addresses,
  17                                  net::NetLog* net_log,
  18                                  const net::NetLog::Source& source)
  19     : socket_(new TCPSocket(net_log, source)),
  20       addresses_(addresses),
  21       current_address_index_(-1),
  22       next_connect_state_(CONNECT_STATE_NONE),
  23       previously_disconnected_(false) {
  24 }
  25
  26 TCPClientSocket::TCPClientSocket(scoped_ptr<TCPSocket> connected_socket,
  27                                  const IPEndPoint& peer_address)
  28     : socket_(connected_socket.Pass()),
  29       addresses_(AddressList(peer_address)),
  30       current_address_index_(0),
  31       next_connect_state_(CONNECT_STATE_NONE),
  32       previously_disconnected_(false) {
  33   DCHECK(socket_);
  34
  35   socket_->SetDefaultOptionsForClient();
  36   use_history_.set_was_ever_connected();
  37 }
  38
  39 TCPClientSocket::~TCPClientSocket() {
  40 }
  41
  42 int TCPClientSocket::Bind(const IPEndPoint& address) {
  43   if (current_address_index_ >= 0 || bind_address_) {
  44     // Cannot bind the socket if we are already connected or connecting.
  45     NOTREACHED();
  46     return ERR_UNEXPECTED;
  47   }
  48
  49   int result = OK;
  50   if (!socket_->IsValid()) {
  51     result = OpenSocket(address.GetFamily());
  52     if (result != OK)
  53       return result;
  54   }
  55
  56   result = socket_->Bind(address);
  57   if (result != OK)
  58     return result;
  59
  60   bind_address_.reset(new IPEndPoint(address));
  61   return OK;
  62 }
  63
  64 int TCPClientSocket::Connect(const CompletionCallback& callback) {
  65   DCHECK(!callback.is_null());
  66
  67   // If connecting or already connected, then just return OK.
  68   if (socket_->IsValid() && current_address_index_ >= 0)
  69     return OK;
  70
  71   socket_->StartLoggingMultipleConnectAttempts(addresses_);
  72
  73   // We will try to connect to each address in addresses_. Start with the
  74   // first one in the list.
  75   next_connect_state_ = CONNECT_STATE_CONNECT;
  76   current_address_index_ = 0;
  77
  78   int rv = DoConnectLoop(OK);
  79   if (rv == ERR_IO_PENDING) {
  80     connect_callback_ = callback;
  81   } else {
  82     socket_->EndLoggingMultipleConnectAttempts(rv);
  83   }
  84
  85   return rv;
  86 }
  87
  88 int TCPClientSocket::DoConnectLoop(int result) {
  89   DCHECK_NE(next_connect_state_, CONNECT_STATE_NONE);
  90
  91   int rv = result;
  92   do {
  93     ConnectState state = next_connect_state_;
  94     next_connect_state_ = CONNECT_STATE_NONE;
  95     switch (state) {
  96       case CONNECT_STATE_CONNECT:
  97         DCHECK_EQ(OK, rv);
  98         rv = DoConnect();
  99         break;
 100       case CONNECT_STATE_CONNECT_COMPLETE:
 101         rv = DoConnectComplete(rv);
 102         break;
 103       default:
 104         NOTREACHED() << "bad state " << state;
 105         rv = ERR_UNEXPECTED;
 106         break;
 107     }
 108   } while (rv != ERR_IO_PENDING && next_connect_state_ != CONNECT_STATE_NONE);
 109
 110   return rv;
 111 }
 112
 113 int TCPClientSocket::DoConnect() {
 114   DCHECK_GE(current_address_index_, 0);
 115   DCHECK_LT(current_address_index_, static_cast<int>(addresses_.size()));
 116
 117   const IPEndPoint& endpoint = addresses_[current_address_index_];
 118
 119   if (previously_disconnected_) {
 120     use_history_.Reset();
 121     previously_disconnected_ = false;
 122   }
 123
 124   next_connect_state_ = CONNECT_STATE_CONNECT_COMPLETE;
 125
 126   if (socket_->IsValid()) {
 127     DCHECK(bind_address_);
 128   } else {
 129     int result = OpenSocket(endpoint.GetFamily());
 130     if (result != OK)
 131       return result;
 132
 133     if (bind_address_) {
 134       result = socket_->Bind(*bind_address_);
 135       if (result != OK) {
 136         socket_->Close();
 137         return result;
 138       }
 139     }
 140   }
 141
 142   // |socket_| is owned by this class and the callback won't be run once
 143   // |socket_| is gone. Therefore, it is safe to use base::Unretained() here.
 144   return socket_->Connect(endpoint,
 145                           base::Bind(&TCPClientSocket::DidCompleteConnect,
 146                                      base::Unretained(this)));
 147 }
 148
 149 int TCPClientSocket::DoConnectComplete(int result) {
 150   if (result == OK) {
 151     use_history_.set_was_ever_connected();
 152     return OK;  // Done!
 153   }
 154
 155   // Close whatever partially connected socket we currently have.
 156   DoDisconnect();
 157
 158   // Try to fall back to the next address in the list.
 159   if (current_address_index_ + 1 < static_cast<int>(addresses_.size())) {
 160     next_connect_state_ = CONNECT_STATE_CONNECT;
 161     ++current_address_index_;
 162     return OK;
 163   }
 164
 165   // Otherwise there is nothing to fall back to, so give up.
 166   return result;
 167 }
 168
 169 void TCPClientSocket::Disconnect() {
 170   DoDisconnect();
 171   current_address_index_ = -1;
 172   bind_address_.reset();
 173 }
 174
 175 void TCPClientSocket::DoDisconnect() {
 176   // If connecting or already connected, record that the socket has been
 177   // disconnected.
 178   previously_disconnected_ = socket_->IsValid() && current_address_index_ >= 0;
 179   socket_->Close();
 180 }
 181
 182 bool TCPClientSocket::IsConnected() const {
 183   return socket_->IsConnected();
 184 }
 185
 186 bool TCPClientSocket::IsConnectedAndIdle() const {
 187   return socket_->IsConnectedAndIdle();
 188 }
 189
 190 int TCPClientSocket::GetPeerAddress(IPEndPoint* address) const {
 191   return socket_->GetPeerAddress(address);
 192 }
 193
 194 int TCPClientSocket::GetLocalAddress(IPEndPoint* address) const {
 195   DCHECK(address);
 196
 197   if (!socket_->IsValid()) {
 198     if (bind_address_) {
 199       *address = *bind_address_;
 200       return OK;
 201     }
 202     return ERR_SOCKET_NOT_CONNECTED;
 203   }
 204
 205   return socket_->GetLocalAddress(address);
 206 }
 207
 208 const BoundNetLog& TCPClientSocket::NetLog() const {
 209   return socket_->net_log();
 210 }
 211
 212 void TCPClientSocket::SetSubresourceSpeculation() {
 213   use_history_.set_subresource_speculation();
 214 }
 215
 216 void TCPClientSocket::SetOmniboxSpeculation() {
 217   use_history_.set_omnibox_speculation();
 218 }
 219
 220 bool TCPClientSocket::WasEverUsed() const {
 221   return use_history_.was_used_to_convey_data();
 222 }
 223
 224 bool TCPClientSocket::UsingTCPFastOpen() const {
 225   return socket_->UsingTCPFastOpen();
 226 }
 227
 228 bool TCPClientSocket::WasNpnNegotiated() const {
 229   return false;
 230 }
 231
 232 NextProto TCPClientSocket::GetNegotiatedProtocol() const {
 233   return kProtoUnknown;
 234 }
 235
 236 bool TCPClientSocket::GetSSLInfo(SSLInfo* ssl_info) {
 237   return false;
 238 }
 239
 240 int TCPClientSocket::Read(IOBuffer* buf,
 241                           int buf_len,
 242                           const CompletionCallback& callback) {
 243   DCHECK(!callback.is_null());
 244
 245   // |socket_| is owned by this class and the callback won't be run once
 246   // |socket_| is gone. Therefore, it is safe to use base::Unretained() here.
 247   CompletionCallback read_callback = base::Bind(
 248       &TCPClientSocket::DidCompleteReadWrite, base::Unretained(this), callback);
 249   int result = socket_->Read(buf, buf_len, read_callback);
 250   if (result > 0)
 251     use_history_.set_was_used_to_convey_data();
 252
 253   return result;
 254 }
 255
 256 int TCPClientSocket::Write(IOBuffer* buf,
 257                            int buf_len,
 258                            const CompletionCallback& callback) {
 259   DCHECK(!callback.is_null());
 260
 261   // |socket_| is owned by this class and the callback won't be run once
 262   // |socket_| is gone. Therefore, it is safe to use base::Unretained() here.
 263   CompletionCallback write_callback = base::Bind(
 264       &TCPClientSocket::DidCompleteReadWrite, base::Unretained(this), callback);
 265   int result = socket_->Write(buf, buf_len, write_callback);
 266   if (result > 0)
 267     use_history_.set_was_used_to_convey_data();
 268
 269   return result;
 270 }
 271
 272 bool TCPClientSocket::SetReceiveBufferSize(int32 size) {
 273   return socket_->SetReceiveBufferSize(size);
 274 }
 275
 276 bool TCPClientSocket::SetSendBufferSize(int32 size) {
 277     return socket_->SetSendBufferSize(size);
 278 }
 279
 280 bool TCPClientSocket::SetKeepAlive(bool enable, int delay) {
 281   return socket_->SetKeepAlive(enable, delay);
 282 }
 283
 284 bool TCPClientSocket::SetNoDelay(bool no_delay) {
 285   return socket_->SetNoDelay(no_delay);
 286 }
 287
 288 void TCPClientSocket::DidCompleteConnect(int result) {
 289   DCHECK_EQ(next_connect_state_, CONNECT_STATE_CONNECT_COMPLETE);
 290   DCHECK_NE(result, ERR_IO_PENDING);
 291   DCHECK(!connect_callback_.is_null());
 292
 293   result = DoConnectLoop(result);
 294   if (result != ERR_IO_PENDING) {
 295     socket_->EndLoggingMultipleConnectAttempts(result);
 296     base::ResetAndReturn(&connect_callback_).Run(result);
 297   }
 298 }
 299
 300 void TCPClientSocket::DidCompleteReadWrite(const CompletionCallback& callback,
 301                                            int result) {
 302   if (result > 0)
 303     use_history_.set_was_used_to_convey_data();
 304
 305   callback.Run(result);
 306 }
 307
 308 int TCPClientSocket::OpenSocket(AddressFamily family) {
 309   DCHECK(!socket_->IsValid());
 310
 311   int result = socket_->Open(family);
 312   if (result != OK)
 313     return result;
 314
 315   socket_->SetDefaultOptionsForClient();
 316
 317   return OK;
 318 }
 319
 320 }  // namespace net