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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 #if defined(_MSC_VER) && _MSC_VER < 1300
     29 #pragma warning(disable:4786)
     30 #endif
     31 
     32 #include "talk/base/asyncudpsocket.h"
     33 #include "talk/base/logging.h"
     34 
     35 namespace talk_base {
     36 
     37 static const int BUF_SIZE = 64 * 1024;
     38 
     39 AsyncUDPSocket* AsyncUDPSocket::Create(SocketFactory* factory,
     40                                        const SocketAddress& address) {
     41   scoped_ptr<AsyncSocket> socket(factory->CreateAsyncSocket(SOCK_DGRAM));
     42   if (!socket.get())
     43     return NULL;
     44   if (socket->Bind(address)) {
     45     LOG(LS_INFO) << "Failed to bind UDP socket " << socket->GetError();
     46     return NULL;
     47   }
     48   return new AsyncUDPSocket(socket.release());
     49 }
     50 
     51 AsyncUDPSocket::AsyncUDPSocket(AsyncSocket* socket)
     52     : socket_(socket) {
     53   ASSERT(socket_.get() != NULL);
     54   size_ = BUF_SIZE;
     55   buf_ = new char[size_];
     56 
     57   // The socket should start out readable but not writable.
     58   socket_->SignalReadEvent.connect(this, &AsyncUDPSocket::OnReadEvent);
     59 }
     60 
     61 AsyncUDPSocket::~AsyncUDPSocket() {
     62   delete [] buf_;
     63 }
     64 
     65 SocketAddress AsyncUDPSocket::GetLocalAddress(bool* allocated) const {
     66   if (allocated)
     67     *allocated = true;
     68   return socket_->GetLocalAddress();
     69 }
     70 
     71 SocketAddress AsyncUDPSocket::GetRemoteAddress() const {
     72   return socket_->GetRemoteAddress();
     73 }
     74 
     75 int AsyncUDPSocket::Send(const void *pv, size_t cb) {
     76   return socket_->Send(pv, cb);
     77 }
     78 
     79 int AsyncUDPSocket::SendTo(
     80     const void *pv, size_t cb, const SocketAddress& addr) {
     81   return socket_->SendTo(pv, cb, addr);
     82 }
     83 
     84 int AsyncUDPSocket::Close() {
     85   return socket_->Close();
     86 }
     87 
     88 Socket::ConnState AsyncUDPSocket::GetState() const {
     89   return socket_->GetState();
     90 }
     91 
     92 int AsyncUDPSocket::GetOption(Socket::Option opt, int* value) {
     93   return socket_->GetOption(opt, value);
     94 }
     95 
     96 int AsyncUDPSocket::SetOption(Socket::Option opt, int value) {
     97   return socket_->SetOption(opt, value);
     98 }
     99 
    100 int AsyncUDPSocket::GetError() const {
    101   return socket_->GetError();
    102 }
    103 
    104 void AsyncUDPSocket::SetError(int error) {
    105   return socket_->SetError(error);
    106 }
    107 
    108 void AsyncUDPSocket::OnReadEvent(AsyncSocket* socket) {
    109   ASSERT(socket_.get() == socket);
    110 
    111   SocketAddress remote_addr;
    112   int len = socket_->RecvFrom(buf_, size_, &remote_addr);
    113   if (len < 0) {
    114     // An error here typically means we got an ICMP error in response to our
    115     // send datagram, indicating the remote address was unreachable.
    116     // When doing ICE, this kind of thing will often happen.
    117     // TODO: Do something better like forwarding the error to the user.
    118     SocketAddress local_addr = socket_->GetLocalAddress();
    119     LOG(LS_INFO) << "AsyncUDPSocket[" << local_addr.ToString() << "] "
    120                  << "receive failed with error " << socket_->GetError();
    121     return;
    122   }
    123 
    124   // TODO: Make sure that we got all of the packet.
    125   // If we did not, then we should resize our buffer to be large enough.
    126   SignalReadPacket(this, buf_, (size_t)len, remote_addr);
    127 }
    128 
    129 }  // namespace talk_base
    130