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/*
* $Id: libnet-example-3.c,v 1.1 1999/10/27 01:37:21 route Exp $
*
* libnet example code
* example 2: raw socket api / ICMP_ECHO packet(s) using an arena
*
* 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.
*
*/
#include "../include/libnet.h"
void usage(char *);
int
main(int argc, char **argv)
{
int network, n, c, number_of_packets, packet_size;
struct libnet_arena arena, *arena_p;
u_char *packets[10];
u_long src_ip, dst_ip;
printf("libnet example code:\tmodule 3\n\n");
printf("packet injection interface:\tlink layer\n");
printf("packet type:\t\t\tICMP_ECHO [no payload] using an arena\n");
src_ip = 0;
dst_ip = 0;
while((c = getopt(argc, argv, "d:s:")) != EOF)
{
switch (c)
{
case 'd':
if (!(dst_ip = libnet_name_resolve(optarg, LIBNET_RESOLVE)))
{
libnet_error(LIBNET_ERR_FATAL, "Bad destination IP address: %s\n", optarg);
}
break;
case 's':
if (!(src_ip = libnet_name_resolve(optarg, LIBNET_RESOLVE)))
{
libnet_error(LIBNET_ERR_FATAL, "Bad source IP address: %s\n", optarg);
}
break;
}
}
if (!src_ip || !dst_ip)
{
usage(argv[0]);
exit(EXIT_FAILURE);
}
/*
* We're just going to build an ICMP packet with no payload using the
* raw sockets API, so we only need memory for a ICMP header and an IP
* header.
*/
packet_size = LIBNET_IP_H + LIBNET_ICMP_ECHO_H;
/*
* Let's just build say, 10 packets.
*/
number_of_packets = 10;
arena_p = &arena;
if (libnet_init_packet_arena(&arena_p, number_of_packets, packet_size) == -1)
{
libnet_error(LIBNET_ERR_FATAL, "libnet_init_packet_arena failed\n");
}
else
{
printf("Allocated an arena of %ld bytes..\n", LIBNET_GET_ARENA_SIZE(arena));
}
network = libnet_open_raw_sock(IPPROTO_RAW);
if (network == -1)
{
libnet_error(LIBNET_ERR_FATAL, "Can't open the network.\n");
}
for (n = 0; n < number_of_packets; n++)
{
printf("%ld bytes remaining in arena\n", LIBNET_GET_ARENA_REMAINING_BYTES(arena));
packets[n] = libnet_next_packet_from_arena(&arena_p, packet_size);
if (!packets[n])
{
libnet_error(LIBNET_ERR_WARNING, "Arena is empty\n");
continue;
}
libnet_build_ip(LIBNET_ICMP_ECHO_H, /* Size of the payload */
IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* IP tos */
242, /* IP ID */
0, /* frag stuff */
48, /* TTL */
IPPROTO_ICMP, /* transport protocol */
src_ip, /* source IP */
dst_ip, /* destination IP */
NULL, /* pointer to payload */
0, /* payload length */
packets[n]); /* packet header memory */
libnet_build_icmp_echo(ICMP_ECHO, /* type */
0, /* code */
242, /* id */
5, /* seq */
NULL, /* pointer to payload */
0, /* payload length */
packets[n] + LIBNET_IP_H); /* packet header memory */
if (libnet_do_checksum(packets[n], IPPROTO_ICMP, LIBNET_ICMP_ECHO_H) == -1)
{
libnet_error(LIBNET_ERR_FATAL, "libnet_do_checksum failed\n");
}
c = libnet_write_ip(network, packets[n], packet_size);
if (c < packet_size)
{
libnet_error(LIBNET_ERR_WARNING, "libnet_write_ip only wrote %d bytes\n", c);
}
else
{
printf("construction and injection of packet %d of %d completed, wrote all %d bytes\n", n + 1, number_of_packets, c);
}
}
libnet_destroy_packet_arena(&arena_p);
return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
}
void
usage(char *name)
{
fprintf(stderr, "usage: %s -s source_ip -d destination_ip\n ", name);
}
/* EOF */
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