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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "talk/base/asyncudpsocket.h"
     29 #include "talk/base/logging.h"
     30 
     31 namespace talk_base {
     32 
     33 static const int BUF_SIZE = 64 * 1024;
     34 
     35 AsyncUDPSocket* AsyncUDPSocket::Create(
     36     AsyncSocket* socket,
     37     const SocketAddress& bind_address) {
     38   scoped_ptr<AsyncSocket> owned_socket(socket);
     39   if (socket->Bind(bind_address) < 0) {
     40     LOG(LS_ERROR) << "Bind() failed with error " << socket->GetError();
     41     return NULL;
     42   }
     43   return new AsyncUDPSocket(owned_socket.release());
     44 }
     45 
     46 AsyncUDPSocket* AsyncUDPSocket::Create(SocketFactory* factory,
     47                                        const SocketAddress& bind_address) {
     48   AsyncSocket* socket =
     49       factory->CreateAsyncSocket(bind_address.family(), SOCK_DGRAM);
     50   if (!socket)
     51     return NULL;
     52   return Create(socket, bind_address);
     53 }
     54 
     55 AsyncUDPSocket::AsyncUDPSocket(AsyncSocket* socket)
     56     : socket_(socket) {
     57   ASSERT(socket_);
     58   size_ = BUF_SIZE;
     59   buf_ = new char[size_];
     60 
     61   // The socket should start out readable but not writable.
     62   socket_->SignalReadEvent.connect(this, &AsyncUDPSocket::OnReadEvent);
     63   socket_->SignalWriteEvent.connect(this, &AsyncUDPSocket::OnWriteEvent);
     64 }
     65 
     66 AsyncUDPSocket::~AsyncUDPSocket() {
     67   delete [] buf_;
     68 }
     69 
     70 SocketAddress AsyncUDPSocket::GetLocalAddress() const {
     71   return socket_->GetLocalAddress();
     72 }
     73 
     74 SocketAddress AsyncUDPSocket::GetRemoteAddress() const {
     75   return socket_->GetRemoteAddress();
     76 }
     77 
     78 int AsyncUDPSocket::Send(const void *pv, size_t cb,
     79                          const talk_base::PacketOptions& options) {
     80   return socket_->Send(pv, cb);
     81 }
     82 
     83 int AsyncUDPSocket::SendTo(const void *pv, size_t cb,
     84                            const SocketAddress& addr,
     85                            const talk_base::PacketOptions& options) {
     86   return socket_->SendTo(pv, cb, addr);
     87 }
     88 
     89 int AsyncUDPSocket::Close() {
     90   return socket_->Close();
     91 }
     92 
     93 AsyncUDPSocket::State AsyncUDPSocket::GetState() const {
     94   return STATE_BOUND;
     95 }
     96 
     97 int AsyncUDPSocket::GetOption(Socket::Option opt, int* value) {
     98   return socket_->GetOption(opt, value);
     99 }
    100 
    101 int AsyncUDPSocket::SetOption(Socket::Option opt, int value) {
    102   return socket_->SetOption(opt, value);
    103 }
    104 
    105 int AsyncUDPSocket::GetError() const {
    106   return socket_->GetError();
    107 }
    108 
    109 void AsyncUDPSocket::SetError(int error) {
    110   return socket_->SetError(error);
    111 }
    112 
    113 void AsyncUDPSocket::OnReadEvent(AsyncSocket* socket) {
    114   ASSERT(socket_.get() == socket);
    115 
    116   SocketAddress remote_addr;
    117   int len = socket_->RecvFrom(buf_, size_, &remote_addr);
    118   if (len < 0) {
    119     // An error here typically means we got an ICMP error in response to our
    120     // send datagram, indicating the remote address was unreachable.
    121     // When doing ICE, this kind of thing will often happen.
    122     // TODO: Do something better like forwarding the error to the user.
    123     SocketAddress local_addr = socket_->GetLocalAddress();
    124     LOG(LS_INFO) << "AsyncUDPSocket[" << local_addr.ToSensitiveString() << "] "
    125                  << "receive failed with error " << socket_->GetError();
    126     return;
    127   }
    128 
    129   // TODO: Make sure that we got all of the packet.
    130   // If we did not, then we should resize our buffer to be large enough.
    131   SignalReadPacket(this, buf_, static_cast<size_t>(len), remote_addr,
    132                    CreatePacketTime(0));
    133 }
    134 
    135 void AsyncUDPSocket::OnWriteEvent(AsyncSocket* socket) {
    136   SignalReadyToSend(this);
    137 }
    138 
    139 }  // namespace talk_base
    140