udp_echo_server.cxx

这是国外的resip协议栈

/*
 * Copyright (C) 2001-2003 Peter J Jones ([e-mail])
 * All Rights Reserved
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of the Author nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * This example shows you how to write a UDP server. It will send back any
 * datagrams that it receives.
 */

// Netxx Includes
#include <Netxx/Address.h>
#include <Netxx/DatagramServer.h>
#include <Netxx/Timeout.h>
#include <Netxx/Types.h>

// Standard Includes
#include <iostream>
#include <exception>

int main (int argc, char *argv[]) {
    try {
	Netxx::Address addr;

	if (argc > 1) {
	    for (int i=1; i<argc; ++i) addr.add_address(argv[i], 7);
	} else {
	    addr.add_all_addresses(7);
	}

	Netxx::DatagramServer server(addr, Netxx::Timeout(10));
	char buffer[4096];
    
	for (;;) {
	    Netxx::DatagramServer::receive_type client =
		server.receive(buffer, sizeof(buffer));

	    if (client.first == -1) {
		std::cout << argv[0] << ": ";
		std::cout << "timeout waiting for incoming datagram\n";
		continue;
	    }

	    std::cout << argv[0] << ": recived datagram from ";
	    std::cout << client.second << "\n";

	    server.send(client.second, buffer, client.first);
	}
    } catch (const std::exception &e) {
	std::cerr << argv[0] << ": " << e.what() << "\n";
	return 1;
    }

    return 0;
}