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/*
* $Id: libnet_build_ethernet.c,v 1.9 2004/04/13 17:32:28 mike Exp $
*
* libnet
* libnet_build_ethernet.c - ethernet packet assembler
*
* 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.
*
*/
#include "common.h"
libnet_ptag_t
libnet_build_ethernet(const uint8_t *dst, const uint8_t *src, uint16_t type,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ethernet_hdr eth_hdr;
if (l == NULL)
{
return (-1);
}
/* sanity check injection type if we're not in advanced mode */
if (l->injection_type != LIBNET_LINK &&
!(((l->injection_type) & LIBNET_ADV_MASK)))
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"%s(): called with non-link layer wire injection primitive",
__func__);
return (-1);
}
n = LIBNET_ETH_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ETH_H);
if (p == NULL)
{
return (-1);
}
memset(ð_hdr, 0, sizeof(eth_hdr));
memcpy(eth_hdr.ether_dhost, dst, ETHER_ADDR_LEN); /* destination address */
memcpy(eth_hdr.ether_shost, src, ETHER_ADDR_LEN); /* source address */
eth_hdr.ether_type = htons(type); /* packet type */
if (libnet_pblock_append(l, p, (uint8_t *)ð_hdr, LIBNET_ETH_H) == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ETH_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_autobuild_ethernet(const uint8_t *dst, uint16_t type, libnet_t *l)
{
uint32_t n, h;
struct libnet_ether_addr *src;
libnet_pblock_t *p;
libnet_ptag_t ptag;
struct libnet_ethernet_hdr eth_hdr;
if (l == NULL)
{
return (-1);
}
/* sanity check injection type if we're not in advanced mode */
if (l->injection_type != LIBNET_LINK &&
!(((l->injection_type) & LIBNET_ADV_MASK)))
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"libnet_autobuild_ethernet() called with non-link layer wire"
" injection primitive");
p = NULL;
goto bad;
}
n = LIBNET_ETH_H;
h = 0;
ptag = LIBNET_PTAG_INITIALIZER;
src = libnet_get_hwaddr(l);
if (src == NULL)
{
/* err msg set in libnet_get_hwaddr() */
return (-1);
}
/*
* Create a new pblock.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ETH_H);
if (p == NULL)
{
return (-1);
}
memset(ð_hdr, 0, sizeof(eth_hdr));
memcpy(eth_hdr.ether_dhost, dst, ETHER_ADDR_LEN); /* destination address */
memcpy(eth_hdr.ether_shost, src, ETHER_ADDR_LEN); /* source address */
eth_hdr.ether_type = htons(type); /* packet type */
if (libnet_pblock_append(l, p, (uint8_t *)ð_hdr, LIBNET_ETH_H) == -1)
{
goto bad;
}
return (libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ETH_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
/**
* Local Variables:
* indent-tabs-mode: nil
* c-file-style: "stroustrup"
* End:
*/
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