/*
 *   Copyright (c) 2000-2002 David Parsons. 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. All advertising materials mentioning features or use of this
 *     software must display the following acknowledgement:
 *     
 *   This product includes software developed by David Parsons
 *   (orc@pell.chi.il.us)
 *
 *  4. My name may not be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *     
 *  THIS SOFTWARE IS PROVIDED BY DAVID PARSONS ``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 DAVID
 *  PARSONS 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.
 */
/*
 * fwset: commands to insert things into a firewall
 *
 * functions: fwopen() opens a control socket
 *            fwcmd() does a command
 *            fwclose() closes a control socket
 */

#include <stdio.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <netdb.h>
#include <netinet/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmp.h>
#include <linux/if.h>
#include <linux/ip_fw.h>
#include <sys/param.h>


int
fwopen(int fw)
{
    int sock;

    if ((sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1) {
	perror("ipfw: control socket open");
	return EOF;
    }
    return sock;
} /* fwopen */


int
fwclose(int sock)
{
    return close(sock);
} /* fwclose */


int
fwcmd(int sock, int cmd, char *data, int len)
{
    int rc;

    if ( (rc = setsockopt(sock, IPPROTO_IP, cmd, data, len)) == 0)
	return 0;
    perror("fwcmd");
    return EOF;
}
