99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/* ethernet.c
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Packet assembly code, originally contributed by Archie Cobbs. */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996-2003 by Internet Software Consortium
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Internet Systems Consortium, Inc.
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* 950 Charter Street
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* Redwood City, CA 94063
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* <info@isc.org>
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* http://www.isc.org/
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*
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* This software has been written for Internet Systems Consortium
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* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
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* To learn more about Internet Systems Consortium, see
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* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
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* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
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* ``http://www.nominum.com''.
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*/
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#ifndef lint
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static char copyright[] =
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"$Id: ethernet.c,v 1.6.2.3 2004/06/10 17:59:17 dhankins Exp $ Copyright (c) 2004 Internet Systems Consortium. All rights reserved.\n";
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#endif /* not lint */
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#include "dhcpd.h"
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#if defined (PACKET_ASSEMBLY) || defined (PACKET_DECODING)
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#include "includes/netinet/if_ether.h"
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#endif /* PACKET_ASSEMBLY || PACKET_DECODING */
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#if defined (PACKET_ASSEMBLY)
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/* Assemble an hardware header... */
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void assemble_ethernet_header (interface, buf, bufix, to)
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struct interface_info *interface;
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unsigned char *buf;
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unsigned *bufix;
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struct hardware *to;
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{
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struct isc_ether_header eh;
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if (to && to -> hlen == 7) /* XXX */
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memcpy (eh.ether_dhost, &to -> hbuf [1],
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sizeof eh.ether_dhost);
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else
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memset (eh.ether_dhost, 0xff, sizeof (eh.ether_dhost));
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if (interface -> hw_address.hlen - 1 == sizeof (eh.ether_shost))
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memcpy (eh.ether_shost, &interface -> hw_address.hbuf [1],
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sizeof (eh.ether_shost));
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else
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memset (eh.ether_shost, 0x00, sizeof (eh.ether_shost));
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eh.ether_type = htons (ETHERTYPE_IP);
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memcpy (&buf [*bufix], &eh, ETHER_HEADER_SIZE);
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*bufix += ETHER_HEADER_SIZE;
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}
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#endif /* PACKET_ASSEMBLY */
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#ifdef PACKET_DECODING
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/* Decode a hardware header... */
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ssize_t decode_ethernet_header (interface, buf, bufix, from)
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struct interface_info *interface;
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unsigned char *buf;
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unsigned bufix;
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struct hardware *from;
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{
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struct isc_ether_header eh;
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memcpy (&eh, buf + bufix, ETHER_HEADER_SIZE);
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#ifdef USERLAND_FILTER
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if (ntohs (eh.ether_type) != ETHERTYPE_IP)
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return -1;
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#endif
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memcpy (&from -> hbuf [1], eh.ether_shost, sizeof (eh.ether_shost));
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from -> hbuf [0] = ARPHRD_ETHER;
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from -> hlen = (sizeof eh.ether_shost) + 1;
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return ETHER_HEADER_SIZE;
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}
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#endif /* PACKET_DECODING */
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