text: //
  // MulticastEchoServer.cpp
  //
  // Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // SPDX-License-Identifier:	BSL-1.0
  //
  
  
  #include "MulticastEchoServer.h"
  
  
  #ifdef POCO_NET_HAS_INTERFACE
  
  
  #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();
  }
  
  
  MulticastEchoServer::~MulticastEchoServer()
  {
  	_stop = true;
  	_thread.join();
  	_socket.leaveGroup(_group.host(), _if);
  }
  
  
  Poco::UInt16 MulticastEchoServer::port() const
  {
  	return _socket.address().port();
  }
  
  
  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;
  			}
  		}
  	}
  }
  
  
  const SocketAddress& MulticastEchoServer::group() const
  {
  	return _group;
  }
  
  
  const NetworkInterface& MulticastEchoServer::interfc() const
  {
  	return _if;
  }
  
  
  Poco::Net::NetworkInterface MulticastEchoServer::findInterface()
  {
  	NetworkInterface::Map m = NetworkInterface::map();
  	for (NetworkInterface::Map::const_iterator it = m.begin(); it != m.end(); ++it)
  	{
  		if (it->second.supportsIPv4() && 
  			it->second.firstAddress(IPAddress::IPv4).isUnicast() && 
  			!it->second.isLoopback() && 
  			!it->second.isPointToPoint())
  		{
  			return it->second;
  		}
  	}
  	return NetworkInterface();
  }
  
  #endif // POCO_NET_HAS_INTERFACE
  