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arp-new.c
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arp-new.c
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/*
* $Id: arp.c,v 1.5 2004/01/28 19:45:00 mike Exp $
*
* libnet 1.1
* Build an ARP packet
*
* Copyright (c) 1998 - 2004 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 c;
uint32_t i;
libnet_t *l;
libnet_ptag_t t;
char *device = NULL;
uint8_t *packet;
uint32_t packet_s;
char errbuf[LIBNET_ERRBUF_SIZE];
printf("libnet 1.1 packet shaping: ARP[link -- autobuilding ethernet]\n");
if (argc > 1)
{
device = argv[1];
}
l = libnet_init(
LIBNET_LINK_ADV, /* injection type */
device, /* network interface */
errbuf); /* errbuf */
if (l == NULL)
{
fprintf(stderr, "%s", errbuf);
exit(EXIT_FAILURE);
}
else
/*
* Build the packet, remmebering that order IS important. We must
* build the packet from lowest protocol type on up as it would
* appear on the wire. So for our ARP packet:
*
* -------------------------------------------
* | Ethernet | ARP |
* -------------------------------------------
* ^ ^
* |------------------ |
* libnet_build_ethernet()--| |
* |
* libnet_build_arp()-----------|
*/
i = libnet_get_ipaddr4(l);
t = libnet_autobuild_arp(
ARPOP_REPLY, /* operation type */
enet_src, /* sender hardware addr */
(uint8_t *)&i, /* sender protocol addr */
enet_dst, /* target hardware addr */
(uint8_t *)&i, /* target protocol addr */
l); /* libnet context */
if (t == -1)
{
fprintf(stderr, "Can't build ARP header: %s\n", libnet_geterror(l));
goto bad;
}
t = libnet_autobuild_ethernet(
enet_dst, /* ethernet destination */
ETHERTYPE_ARP, /* protocol type */
l); /* libnet handle */
if (t == -1)
{
fprintf(stderr, "Can't build ethernet header: %s\n",
libnet_geterror(l));
goto bad;
}
if (libnet_adv_cull_packet(l, &packet, &packet_s) == -1)
{
fprintf(stderr, "%s", libnet_geterror(l));
}
else
{
fprintf(stderr, "packet size: %d\n", packet_s);
libnet_adv_free_packet(l, packet);
}
c = libnet_write(l);
if (c == -1)
{
fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
goto bad;
}
else
{
fprintf(stderr, "Wrote %d byte ARP packet from context \"%s\"; "
"check the wire.\n", c, libnet_cq_getlabel(l));
}
libnet_destroy(l);
return (EXIT_SUCCESS);
bad:
libnet_destroy(l);
return (EXIT_FAILURE);
}