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MulticastEchoServer.cpp

//
// MulticastEchoServer.cpp
//
// $Id: //poco/1.2/Net/testsuite/src/MulticastEchoServer.cpp#1 $
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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//


#include "MulticastEchoServer.h"
#include "Poco/Timespan.h"
#include <iostream>


using Poco::Net::Socket;
using Poco::Net::DatagramSocket;
using Poco::Net::SocketAddress;
using Poco::Net::IPAddress;
using Poco::Net::NetworkInterface;


MulticastEchoServer::MulticastEchoServer():
      _group("239.255.1.2", 12345),
      _if(findInterface()),
      _thread("MulticastEchoServer"),
      _stop(false)
{
      _socket.bind(SocketAddress(IPAddress(), _group.port()), true);
      _socket.joinGroup(_group.host(), _if);
      _thread.start(*this);
      _ready.wait();
}


00058 MulticastEchoServer::~MulticastEchoServer()
{
      _stop = true;
      _thread.join();
      _socket.leaveGroup(_group.host(), _if);
}


00066 Poco::UInt16 MulticastEchoServer::port() const
{
      return _socket.address().port();
}


00072 void MulticastEchoServer::run()
{
      _ready.set();
      Poco::Timespan span(250000);
      while (!_stop)
      {
            if (_socket.poll(span, Socket::SELECT_READ))
            {
                  try
                  {
                        char buffer[256];
                        SocketAddress sender;
                        int n = _socket.receiveFrom(buffer, sizeof(buffer), sender);
                        _socket.sendTo(buffer, n, sender);
                  }
                  catch (Poco::Exception& exc)
                  {
                        std::cerr << "MulticastEchoServer: " << exc.displayText() << std::endl;
                  }
            }
      }
}


00096 const SocketAddress& MulticastEchoServer::group() const
{
      return _group;
}


00102 const NetworkInterface& MulticastEchoServer::interface() const
{
      return _if;
}


00108 Poco::Net::NetworkInterface MulticastEchoServer::findInterface()
{
      NetworkInterface::NetworkInterfaceList ifs = NetworkInterface::list();
      for (NetworkInterface::NetworkInterfaceList::const_iterator it = ifs.begin(); it != ifs.end(); ++it)
      {
            if (it->supportsIPv4() && it->address().isUnicast() && !it->address().isLoopback())
                  return *it;
      }
      return NetworkInterface();
}

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