/*
 *   C++ sockets on Unix and Windows
 *   Copyright (C) 2002
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "PracticalSocket.h" // For UDPSocket and SocketException
#include <iostream>          // For cout and cerr
#include <cstdlib>           // For atoi()

const int ECHOMAX = 255;     // Longest string to echo

int main(int argc, char *argv[]) {

  if (argc != 2) {                  // Test for correct number of parameters
    cerr << "Usage: " << argv[0] << " <Server Port>" << endl;
    exit(1);
  }

  unsigned short echoServPort = atoi(argv[1]);     // First arg:  local port

  try {
    UDPSocket sock(echoServPort);                
  
    char echoBuffer[ECHOMAX];         // Buffer for echo string
    int recvMsgSize;                  // Size of received message
    string sourceAddress;             // Address of datagram source
    unsigned short sourcePort;        // Port of datagram source
    for (;;) {  // Run forever
      // Block until receive message from a client
      recvMsgSize = sock.recvFrom(echoBuffer, ECHOMAX, sourceAddress, 
                                      sourcePort);
  
      cout << "Received packet from " << sourceAddress << ":" 
           << sourcePort << endl;
  
      sock.sendTo(echoBuffer, recvMsgSize, sourceAddress, sourcePort);
    }
  } catch (SocketException &e) {
    cerr << e.what() << endl;
    exit(1);
  }
  // NOT REACHED

  return 0;
}