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/*
* $Id: icmp_redirect.c,v 1.3 2004/03/16 18:40:58 mike Exp $
*
* libnet 1.1
* Build an ICMP redirect packet
*
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* Copyright (c) 2003 Alberto Ornaghi <alor@antifork.org>
* 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 c;
libnet_t *l;
libnet_ptag_t t;
u_long src_ip, dst_ip, gw_ip;
u_char payload[8] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};
u_long payload_s = 8;
char errbuf[LIBNET_ERRBUF_SIZE];
printf("libnet 1.1 packet shaping: ICMP redirect[link]\n");
/*
* Initialize the library. Root priviledges are required.
*/
l = libnet_init(
LIBNET_LINK, /* injection type */
NULL, /* network interface */
errbuf); /* errbuf */
if (l == NULL)
{
fprintf(stderr, "libnet_init() failed: %s", errbuf);
exit(EXIT_FAILURE);
}
src_ip = 0;
dst_ip = 0;
gw_ip = 0;
while((c = getopt(argc, argv, "d:s:g:")) != EOF)
{
switch (c)
{
case 'd':
if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
{
fprintf(stderr, "Bad destination IP address: %s\n", optarg);
exit(1);
}
break;
case 's':
if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
{
fprintf(stderr, "Bad source IP address: %s\n", optarg);
exit(1);
}
break;
case 'g':
if ((gw_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
{
fprintf(stderr, "Bad gateway IP address: %s\n", optarg);
exit(1);
}
break;
}
}
if (!src_ip || !dst_ip || !gw_ip)
{
usage(argv[0]);
exit(EXIT_FAILURE);
}
t = libnet_build_ipv4(
LIBNET_IPV4_H + payload_s, /* length */
IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */
0x42, /* IP ID */
0, /* IP Frag */
64, /* TTL */
IPPROTO_ICMP, /* protocol */
0, /* checksum */
dst_ip, /* source IP */
src_ip, /* destination IP */
payload, /* payload */
payload_s, /* payload size */
l, /* libnet handle */
0);
if (t == -1)
{
fprintf(stderr, "Can't build error IP header: %s\n",
libnet_geterror(l));
goto bad;
}
t = libnet_build_icmpv4_redirect(
ICMP_REDIRECT, /* type */
ICMP_REDIRECT_HOST, /* code */
0, /* checksum */
gw_ip,
NULL,
0,
l, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
fprintf(stderr, "Can't build ICMP header: %s\n", libnet_geterror(l));
goto bad;
}
t = libnet_build_ipv4(
LIBNET_IPV4_H + LIBNET_ICMPV4_REDIRECT_H +
LIBNET_IPV4_H + payload_s, /* length */
IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */
0xee, /* IP ID */
0, /* IP Frag */
64, /* TTL */
IPPROTO_ICMP, /* protocol */
0, /* checksum */
src_ip, /* source IP */
dst_ip, /* destination IP */
NULL, /* payload */
0, /* payload size */
l, /* libnet handle */
0);
if (t == -1)
{
fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
goto bad;
}
t = libnet_build_ethernet(
enet_dst, /* ethernet destination */
enet_src, /* ethernet source */
ETHERTYPE_IP, /* protocol type */
NULL, /* payload */
0, /* payload size */
l, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));
goto bad;
}
/*
* Write it to the wire.
*/
c = libnet_write(l);
if (c == -1)
{
fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
goto bad;
}
else
{
fprintf(stderr, "Wrote %d byte ICMP packet; check the wire.\n", c);
}
libnet_destroy(l);
return (EXIT_SUCCESS);
bad:
libnet_destroy(l);
return (EXIT_FAILURE);
}
void
usage(char *name)
{
fprintf(stderr, "usage: %s -s source_ip -d destination_ip -g gateway_ip\n ", name);
}
/* EOF */
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