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/*
* $Id: cdp.c,v 1.3 2004/11/09 07:05:07 mike Exp $
*
* cdppoke
* CDP information injection tool
* Released as part of the MXFP Layer 2 Toolkit
* http://www.packetfactory.net/MXFP
*
* Copyright (c) 2004 Mike D. Schiffman <mike@infonexus.com>
* Copyright (c) 2004 Jeremy Rauch <jrauch@cadre.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, len, index;
libnet_t *l;
libnet_ptag_t t;
u_char *value;
u_char values[100];
u_short tmp;
char errbuf[LIBNET_ERRBUF_SIZE];
uint8_t oui[3] = { 0x00, 0x00, 0x0c };
uint8_t cdp_mac[6] = {0x01, 0x0, 0xc, 0xcc, 0xcc, 0xcc};
if (argc != 3)
{
fprintf(stderr, "usage %s device device-id\n", argv[0]);
return (EXIT_FAILURE);
}
fprintf(stderr, "cdppoke...\n");
l = libnet_init(LIBNET_LINK, argv[1], errbuf);
if (l == NULL)
{
fprintf(stderr, "libnet_init() failed: %s", errbuf);
return (EXIT_FAILURE);
}
/* build the TLV's by hand until we get something better */
memset(values, 0, sizeof(values));
index = 0;
tmp = htons(LIBNET_CDP_VERSION);
memcpy(values, &tmp, 2);
index += 2;
tmp = htons(9); /* length of string below plus type and length fields */
memcpy(values + index, &tmp, 2);
index += 2;
memcpy(values + index, (u_char *)"1.1.1", 5);
index += 5;
/* this TLV is handled by the libnet builder */
value = (u_char *)argv[2];
len = strlen(argv[2]);
/* build CDP header */
t = libnet_build_cdp(
1, /* version */
30, /* time to live */
0x0, /* checksum */
0x1, /* type */
len, /* length */
value, /* value */
values, /* payload */
index, /* payload size */
l, /* libnet context */
0); /* libnet ptag */
if (t == -1)
{
fprintf(stderr, "Can't build CDP header: %s\n", libnet_geterror(l));
goto bad;
}
/* build 802.2 header */
t = libnet_build_802_2snap(
LIBNET_SAP_SNAP, /* SAP SNAP code */
LIBNET_SAP_SNAP, /* SAP SNAP code */
0x03, /* control */
oui, /* OUI */
0x2000, /* upper layer protocol type */
NULL, /* payload */
0, /* payload size */
l, /* libnet context */
0); /* libnet ptag */
if (t == -1)
{
fprintf(stderr, "Can't build SNAP header: %s\n", libnet_geterror(l));
goto bad;
}
/* build 802.3 header */
t = libnet_build_802_3(
cdp_mac, /* ethernet destination */
(uint8_t *)libnet_get_hwaddr(l), /* ethernet source */
LIBNET_802_2_H + LIBNET_802_2SNAP_H + LIBNET_CDP_H, /* packet len */
NULL, /* payload */
0, /* payload size */
l, /* libnet context */
0); /* libnet ptag */
if (t == -1)
{
fprintf(stderr, "Can't build 802.3 header: %s\n", libnet_geterror(l));
goto bad;
}
/* write the packet out */
c = libnet_write(l);
if (c == -1)
{
fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
goto bad;
}
else
{
fprintf(stderr, "Wrote %d byte CDP frame \"%s\"\n", c, argv[2]);
}
libnet_destroy(l);
return (EXIT_SUCCESS);
bad:
libnet_destroy(l);
return (EXIT_FAILURE);
}
/* EOF */
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