src/remoting/jingle_glue/chromium_socket_factory.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 "remoting/jingle_glue/chromium_socket_factory.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "jingle/glue/utils.h"
  11 #include "net/base/io_buffer.h"
  12 #include "net/base/ip_endpoint.h"
  13 #include "net/base/net_errors.h"
  14 #include "net/udp/udp_server_socket.h"
  15 #include "third_party/libjingle/source/talk/base/asyncpacketsocket.h"
  16 #include "third_party/libjingle/source/talk/base/nethelpers.h"
  17
  18 namespace remoting {
  19
  20 namespace {
  21
  22 // Size of the buffer to allocate for RecvFrom().
  23 const int kReceiveBufferSize = 65536;
  24
  25 // Maximum amount of data in the send buffers. This is necessary to
  26 // prevent out-of-memory crashes if the caller sends data faster than
  27 // Pepper's UDP API can handle it. This maximum should never be
  28 // reached under normal conditions.
  29 const int kMaxSendBufferSize = 256 * 1024;
  30
  31 // Defines set of transient errors. These errors are ignored when we get them
  32 // from sendto() calls.
  33 bool IsTransientError(int error) {
  34   return error == net::ERR_ADDRESS_UNREACHABLE ||
  35       error == net::ERR_ADDRESS_INVALID;
  36 }
  37
  38 class UdpPacketSocket : public talk_base::AsyncPacketSocket {
  39  public:
  40   UdpPacketSocket();
  41   virtual ~UdpPacketSocket();
  42
  43   bool Init(const talk_base::SocketAddress& local_address,
  44             int min_port, int max_port);
  45
  46   // talk_base::AsyncPacketSocket interface.
  47   virtual talk_base::SocketAddress GetLocalAddress() const OVERRIDE;
  48   virtual talk_base::SocketAddress GetRemoteAddress() const OVERRIDE;
  49   virtual int Send(const void* data, size_t data_size,
  50                    talk_base::DiffServCodePoint dscp) OVERRIDE;
  51   virtual int SendTo(const void* data, size_t data_size,
  52                      const talk_base::SocketAddress& address,
  53                      talk_base::DiffServCodePoint dscp) OVERRIDE;
  54   virtual int Close() OVERRIDE;
  55   virtual State GetState() const OVERRIDE;
  56   virtual int GetOption(talk_base::Socket::Option option, int* value) OVERRIDE;
  57   virtual int SetOption(talk_base::Socket::Option option, int value) OVERRIDE;
  58   virtual int GetError() const OVERRIDE;
  59   virtual void SetError(int error) OVERRIDE;
  60
  61  private:
  62   struct PendingPacket {
  63     PendingPacket(const void* buffer,
  64                   int buffer_size,
  65                   const net::IPEndPoint& address);
  66
  67     scoped_refptr<net::IOBufferWithSize> data;
  68     net::IPEndPoint address;
  69   };
  70
  71   void OnBindCompleted(int error);
  72
  73   void DoSend();
  74   void OnSendCompleted(int result);
  75
  76   void DoRead();
  77   void OnReadCompleted(int result);
  78   void HandleReadResult(int result);
  79
  80   scoped_ptr<net::UDPServerSocket> socket_;
  81
  82   State state_;
  83   int error_;
  84
  85   talk_base::SocketAddress local_address_;
  86
  87   // Receive buffer and address are populated by asynchronous reads.
  88   scoped_refptr<net::IOBuffer> receive_buffer_;
  89   net::IPEndPoint receive_address_;
  90
  91   bool send_pending_;
  92   std::list<PendingPacket> send_queue_;
  93   int send_queue_size_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(UdpPacketSocket);
  96 };
  97
  98 UdpPacketSocket::PendingPacket::PendingPacket(
  99     const void* buffer,
 100     int buffer_size,
 101     const net::IPEndPoint& address)
 102     : data(new net::IOBufferWithSize(buffer_size)),
 103       address(address) {
 104   memcpy(data->data(), buffer, buffer_size);
 105 }
 106
 107 UdpPacketSocket::UdpPacketSocket()
 108     : state_(STATE_CLOSED),
 109       error_(0),
 110       send_pending_(false),
 111       send_queue_size_(0) {
 112 }
 113
 114 UdpPacketSocket::~UdpPacketSocket() {
 115   Close();
 116 }
 117
 118 bool UdpPacketSocket::Init(const talk_base::SocketAddress& local_address,
 119                            int min_port, int max_port) {
 120   net::IPEndPoint local_endpoint;
 121   if (!jingle_glue::SocketAddressToIPEndPoint(
 122           local_address, &local_endpoint)) {
 123     return false;
 124   }
 125
 126   for (int port = min_port; port <= max_port; ++port) {
 127     socket_.reset(new net::UDPServerSocket(NULL, net::NetLog::Source()));
 128     int result = socket_->Listen(
 129         net::IPEndPoint(local_endpoint.address(), port));
 130     if (result == net::OK) {
 131       break;
 132     } else {
 133       socket_.reset();
 134     }
 135   }
 136
 137   if (!socket_.get()) {
 138     // Failed to bind the socket.
 139     return false;
 140   }
 141
 142   if (socket_->GetLocalAddress(&local_endpoint) != net::OK ||
 143       !jingle_glue::IPEndPointToSocketAddress(local_endpoint,
 144                                               &local_address_)) {
 145     return false;
 146   }
 147
 148   state_ = STATE_BOUND;
 149   DoRead();
 150
 151   return true;
 152 }
 153
 154 talk_base::SocketAddress UdpPacketSocket::GetLocalAddress() const {
 155   DCHECK_EQ(state_, STATE_BOUND);
 156   return local_address_;
 157 }
 158
 159 talk_base::SocketAddress UdpPacketSocket::GetRemoteAddress() const {
 160   // UDP sockets are not connected - this method should never be called.
 161   NOTREACHED();
 162   return talk_base::SocketAddress();
 163 }
 164
 165 int UdpPacketSocket::Send(const void* data, size_t data_size,
 166                           talk_base::DiffServCodePoint dscp) {
 167   // UDP sockets are not connected - this method should never be called.
 168   NOTREACHED();
 169   return EWOULDBLOCK;
 170 }
 171
 172 int UdpPacketSocket::SendTo(const void* data, size_t data_size,
 173                             const talk_base::SocketAddress& address,
 174                             talk_base::DiffServCodePoint dscp) {
 175   if (state_ != STATE_BOUND) {
 176     NOTREACHED();
 177     return EINVAL;
 178   }
 179
 180   if (error_ != 0) {
 181     return error_;
 182   }
 183
 184   net::IPEndPoint endpoint;
 185   if (!jingle_glue::SocketAddressToIPEndPoint(address, &endpoint)) {
 186     return EINVAL;
 187   }
 188
 189   if (send_queue_size_ >= kMaxSendBufferSize) {
 190     return EWOULDBLOCK;
 191   }
 192
 193   send_queue_.push_back(PendingPacket(data, data_size, endpoint));
 194   send_queue_size_ += data_size;
 195
 196   DoSend();
 197   return data_size;
 198 }
 199
 200 int UdpPacketSocket::Close() {
 201   state_ = STATE_CLOSED;
 202   socket_.reset();
 203   return 0;
 204 }
 205
 206 talk_base::AsyncPacketSocket::State UdpPacketSocket::GetState() const {
 207   return state_;
 208 }
 209
 210 int UdpPacketSocket::GetOption(talk_base::Socket::Option option, int* value) {
 211   // This method is never called by libjingle.
 212   NOTIMPLEMENTED();
 213   return -1;
 214 }
 215
 216 int UdpPacketSocket::SetOption(talk_base::Socket::Option option, int value) {
 217   if (state_ != STATE_BOUND) {
 218     NOTREACHED();
 219     return EINVAL;
 220   }
 221
 222   switch (option) {
 223     case talk_base::Socket::OPT_DONTFRAGMENT:
 224       NOTIMPLEMENTED();
 225       return -1;
 226
 227     case talk_base::Socket::OPT_RCVBUF: {
 228       bool success = socket_->SetReceiveBufferSize(value);
 229       return success ? 0 : -1;
 230     }
 231
 232     case talk_base::Socket::OPT_SNDBUF: {
 233       bool success = socket_->SetSendBufferSize(value);
 234       return success ? 0 : -1;
 235     }
 236
 237     case talk_base::Socket::OPT_NODELAY:
 238       // OPT_NODELAY is only for TCP sockets.
 239       NOTREACHED();
 240       return -1;
 241
 242     case talk_base::Socket::OPT_IPV6_V6ONLY:
 243       NOTIMPLEMENTED();
 244       return -1;
 245
 246     case talk_base::Socket::OPT_DSCP:
 247       NOTIMPLEMENTED();
 248       return -1;
 249   }
 250
 251   NOTREACHED();
 252   return -1;
 253 }
 254
 255 int UdpPacketSocket::GetError() const {
 256   return error_;
 257 }
 258
 259 void UdpPacketSocket::SetError(int error) {
 260   error_ = error;
 261 }
 262
 263 void UdpPacketSocket::DoSend() {
 264   if (send_pending_ || send_queue_.empty())
 265     return;
 266
 267   PendingPacket& packet = send_queue_.front();
 268   int result = socket_->SendTo(
 269       packet.data.get(),
 270       packet.data->size(),
 271       packet.address,
 272       base::Bind(&UdpPacketSocket::OnSendCompleted, base::Unretained(this)));
 273   if (result == net::ERR_IO_PENDING) {
 274     send_pending_ = true;
 275   } else {
 276     OnSendCompleted(result);
 277   }
 278 }
 279
 280 void UdpPacketSocket::OnSendCompleted(int result) {
 281   send_pending_ = false;
 282
 283   if (result < 0) {
 284     if (!IsTransientError(result)) {
 285       LOG(ERROR) << "Send failed on a UDP socket: " << result;
 286       error_ = EINVAL;
 287       return;
 288     }
 289   }
 290
 291   // Don't need to worry about partial sends because this is a datagram
 292   // socket.
 293   send_queue_size_ -= send_queue_.front().data->size();
 294   send_queue_.pop_front();
 295   DoSend();
 296 }
 297
 298 void UdpPacketSocket::DoRead() {
 299   int result = 0;
 300   while (result >= 0) {
 301     receive_buffer_ = new net::IOBuffer(kReceiveBufferSize);
 302     result = socket_->RecvFrom(
 303         receive_buffer_.get(),
 304         kReceiveBufferSize,
 305         &receive_address_,
 306         base::Bind(&UdpPacketSocket::OnReadCompleted, base::Unretained(this)));
 307     HandleReadResult(result);
 308   }
 309 }
 310
 311 void UdpPacketSocket::OnReadCompleted(int result) {
 312   HandleReadResult(result);
 313   if (result >= 0) {
 314     DoRead();
 315   }
 316 }
 317
 318 void UdpPacketSocket::HandleReadResult(int result) {
 319   if (result == net::ERR_IO_PENDING) {
 320     return;
 321   }
 322
 323   if (result > 0) {
 324     talk_base::SocketAddress address;
 325     if (!jingle_glue::IPEndPointToSocketAddress(receive_address_, &address)) {
 326       NOTREACHED();
 327       LOG(ERROR) << "Failed to convert address received from RecvFrom().";
 328       return;
 329     }
 330     SignalReadPacket(this, receive_buffer_->data(), result, address,
 331                      talk_base::CreatePacketTime(0));
 332   } else {
 333     LOG(ERROR) << "Received error when reading from UDP socket: " << result;
 334   }
 335 }
 336
 337 }  // namespace
 338
 339 ChromiumPacketSocketFactory::ChromiumPacketSocketFactory() {
 340 }
 341
 342 ChromiumPacketSocketFactory::~ChromiumPacketSocketFactory() {
 343 }
 344
 345 talk_base::AsyncPacketSocket* ChromiumPacketSocketFactory::CreateUdpSocket(
 346       const talk_base::SocketAddress& local_address,
 347       int min_port, int max_port) {
 348   scoped_ptr<UdpPacketSocket> result(new UdpPacketSocket());
 349   if (!result->Init(local_address, min_port, max_port))
 350     return NULL;
 351   return result.release();
 352 }
 353
 354 talk_base::AsyncPacketSocket*
 355 ChromiumPacketSocketFactory::CreateServerTcpSocket(
 356     const talk_base::SocketAddress& local_address,
 357     int min_port, int max_port,
 358     int opts) {
 359   // We don't use TCP sockets for remoting connections.
 360   NOTREACHED();
 361   return NULL;
 362 }
 363
 364 talk_base::AsyncPacketSocket*
 365 ChromiumPacketSocketFactory::CreateClientTcpSocket(
 366       const talk_base::SocketAddress& local_address,
 367       const talk_base::SocketAddress& remote_address,
 368       const talk_base::ProxyInfo& proxy_info,
 369       const std::string& user_agent,
 370       int opts) {
 371   // We don't use TCP sockets for remoting connections.
 372   NOTREACHED();
 373   return NULL;
 374 }
 375
 376 talk_base::AsyncResolverInterface*
 377 ChromiumPacketSocketFactory::CreateAsyncResolver() {
 378   return new talk_base::AsyncResolver();
 379 }
 380
 381 }  // namespace remoting