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/* ethernet.c
Packet assembly code, originally contributed by Archie Cobbs. */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-2003 by Internet Software Consortium
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Internet Systems Consortium, Inc.
* 950 Charter Street
* Redwood City, CA 94063
* <info@isc.org>
* http://www.isc.org/
*
* This software has been written for Internet Systems Consortium
* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
* To learn more about Internet Systems Consortium, see
* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
* ``http://www.nominum.com''.
*/
#ifndef lint
static char copyright[] =
"$Id: ethernet.c,v 1.8 2005/03/17 20:14:58 dhankins Exp $ Copyright (c) 2004 Internet Systems Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
#if defined (PACKET_ASSEMBLY) || defined (PACKET_DECODING)
#include "includes/netinet/if_ether.h"
#endif /* PACKET_ASSEMBLY || PACKET_DECODING */
#if defined (PACKET_ASSEMBLY)
/* Assemble an hardware header... */
void assemble_ethernet_header (interface, buf, bufix, to)
struct interface_info *interface;
unsigned char *buf;
unsigned *bufix;
struct hardware *to;
{
struct isc_ether_header eh;
if (to && to -> hlen == 7) /* XXX */
memcpy (eh.ether_dhost, &to -> hbuf [1],
sizeof eh.ether_dhost);
else
memset (eh.ether_dhost, 0xff, sizeof (eh.ether_dhost));
if (interface -> hw_address.hlen - 1 == sizeof (eh.ether_shost))
memcpy (eh.ether_shost, &interface -> hw_address.hbuf [1],
sizeof (eh.ether_shost));
else
memset (eh.ether_shost, 0x00, sizeof (eh.ether_shost));
eh.ether_type = htons (ETHERTYPE_IP);
memcpy (&buf [*bufix], &eh, ETHER_HEADER_SIZE);
*bufix += ETHER_HEADER_SIZE;
}
#endif /* PACKET_ASSEMBLY */
#ifdef PACKET_DECODING
/* Decode a hardware header... */
ssize_t decode_ethernet_header (interface, buf, bufix, from)
struct interface_info *interface;
unsigned char *buf;
unsigned bufix;
struct hardware *from;
{
struct isc_ether_header eh;
memcpy (&eh, buf + bufix, ETHER_HEADER_SIZE);
#ifdef USERLAND_FILTER
if (ntohs (eh.ether_type) != ETHERTYPE_IP)
return -1;
#endif
memcpy (&from -> hbuf [1], eh.ether_shost, sizeof (eh.ether_shost));
from -> hbuf [0] = ARPHRD_ETHER;
from -> hlen = (sizeof eh.ether_shost) + 1;
return ETHER_HEADER_SIZE;
}
#endif /* PACKET_DECODING */
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