udp_nb_socket.c

/*
 * Copyright (c) 2006-2007 Secure Endpoints Inc.
 *  
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * 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 AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

/*
 * Copyright  ©  2000
 * The Regents of the University of Michigan
 * ALL RIGHTS RESERVED
 *
 * permission is granted to use, copy, create derivative works 
 * and redistribute this software and such derivative works 
 * for any purpose, so long as the name of the university of 
 * michigan is not used in any advertising or publicity 
 * pertaining to the use or distribution of this software 
 * without specific, written prior authorization.  if the 
 * above copyright notice or any other identification of the 
 * university of michigan is included in any copy of any 
 * portion of this software, then the disclaimer below must 
 * also be included.
 *
 * this software is provided as is, without representation 
 * from the university of michigan as to its fitness for any 
 * purpose, and without warranty by the university of 
 * michigan of any kind, either express or implied, including 
 * without limitation the implied warranties of 
 * merchantability and fitness for a particular purpose. the 
 * regents of the university of michigan shall not be liable 
 * for any damages, including special, indirect, incidental, or 
 * consequential damages, with respect to any claim arising 
 * out of or in connection with the use of the software, even 
 * if it has been or is hereafter advised of the possibility of 
 * such damages.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <winsock.h>

SOCKET
udp_nb_socket(int port)
{
	struct sockaddr_in sockaddr;
	unsigned long	arg;
	SOCKET		s;


	if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
	{
		perror("can't make socket");
		return INVALID_SOCKET;
	}

	memset(&sockaddr, 0, sizeof(struct sockaddr_in));
	sockaddr.sin_port = htons((short)port);

	arg=1;
	if (ioctlsocket(s, FIONBIO, &arg) < 0) {
	    closesocket(s);
            perror("setting datagram socket to non-blocking");
            return INVALID_SOCKET;
	}

	if (!port)
            return s;

	if (bind(s, (void *)&sockaddr, sizeof(struct sockaddr_in)) < 0) {
	    closesocket(s);
            perror("binding datagram socket");
            return INVALID_SOCKET;
	}

	return s;
}