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/*
* $Id: udp.c,v 1.6 1999/10/27 01:37:29 route Exp $
*
* libnet
* UDP Packet assembly tester
*
* Copyright (c) 1998, 1999 Mike D. Schiffman <mike@infonexus.com>
* 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.
*
* 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.
*
*/
#if (HAVE_CONFIG_H)
#include "../../include/config.h"
#endif
#include "../libnet_test.h"
int
main(int argc, char **argv)
{
int sock, c;
u_long src_ip, dst_ip;
u_short src_prt, dst_prt;
u_char *cp, *buf;
printf("UDP packet building/writing test\n");
src_ip = 0;
dst_ip = 0;
src_prt = 0;
dst_prt = 0;
while((c = getopt(argc, argv, "d:s:")) != EOF)
{
switch (c)
{
/*
* We expect the input to be of the form `ip.ip.ip.ip.port`. We
* point cp to the last dot of the IP address/port string and
* then seperate them with a NULL byte. The optarg now points to
* just the IP address, and cp points to the port.
*/
case 'd':
if (!(cp = strrchr(optarg, '.')))
{
usage(argv[0]);
}
*cp++ = 0;
dst_prt = (u_short)atoi(cp);
if (!(dst_ip = libnet_name_resolve(optarg, 1)))
{
fprintf(stderr, "Bad destination IP address: %s\n", optarg);
exit(1);
}
break;
case 's':
if (!(cp = strrchr(optarg, '.')))
{
usage(argv[0]);
}
*cp++ = 0;
src_prt = (u_short)atoi(cp);
if (!(src_ip = libnet_name_resolve(optarg, 1)))
{
fprintf(stderr, "Bad source IP address: %s\n", optarg);
exit(1);
}
break;
}
}
if (!src_ip || !src_prt || !dst_ip || !dst_prt)
{
usage(argv[0]);
exit(EXIT_FAILURE);
}
buf = malloc(LIBNET_UDP_H + LIBNET_IP_H);
if (!buf)
{
perror("No memory for packet header");
exit(EXIT_FAILURE);
}
sock = libnet_open_raw_sock(IPPROTO_RAW);
if (sock == -1)
{
perror("No socket");
exit(EXIT_FAILURE);
}
libnet_build_ip(LIBNET_UDP_H,
0,
242,
0,
64,
IPPROTO_UDP,
src_ip,
dst_ip,
NULL,
0,
buf);
libnet_build_udp(src_prt, dst_prt, NULL, 0, buf + LIBNET_IP_H);
libnet_do_checksum(buf, IPPROTO_UDP, LIBNET_UDP_H);
c = libnet_write_ip(sock, buf, LIBNET_UDP_H + LIBNET_IP_H);
if (c < LIBNET_UDP_H + LIBNET_IP_H)
{
fprintf(stderr, "libnet_write_ip\n");
}
printf("Completed, wrote %d bytes\n", c);
free(buf);
return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
}
void
usage(u_char *name)
{
fprintf(stderr,
"usage: %s -s source_ip.source_port -d destination_ip.destination_port\n",
name);
}
/* EOF */
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