mirror of
https://gitlab.isc.org/isc-projects/dhcp
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91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/* packet.c
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Packet assembly code, originally contributed by Archie Cobbs. */
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/*
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* Copyright (c) 1996-1999 Internet Software Consortium.
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* Use is subject to license terms which appear in the file named
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* ISC-LICENSE that should have accompanied this file when you
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* received it. If a file named ISC-LICENSE did not accompany this
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* file, or you are not sure the one you have is correct, you may
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* obtain an applicable copy of the license at:
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*
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* http://www.isc.org/isc-license-1.0.html.
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*
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* This file is part of the ISC DHCP distribution. The documentation
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* associated with this file is listed in the file DOCUMENTATION,
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* included in the top-level directory of this release.
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*
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* Support and other services are available for ISC products - see
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* http://www.isc.org for more information.
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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 1.2 1999/10/07 06:35:42 mellon Exp $ Copyright (c) 1996 The Internet Software 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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/* XXX currently only supports ethernet; doesn't check for other types. */
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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 ether_header eh;
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if (to && to -> hlen == 6) /* XXX */
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memcpy (eh.ether_dhost, to -> haddr, 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 == sizeof (eh.ether_shost))
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memcpy (eh.ether_shost, interface -> hw_address.haddr,
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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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#ifdef BROKEN_FREEBSD_BPF /* Fixed in FreeBSD 2.2 */
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eh.ether_type = ETHERTYPE_IP;
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#else
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eh.ether_type = htons (ETHERTYPE_IP);
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#endif
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memcpy (&buf [*bufix], &eh, sizeof eh);
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*bufix += sizeof eh;
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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 ether_header eh;
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memcpy (&eh, buf + bufix, sizeof eh);
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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 -> haddr, eh.ether_shost, sizeof (eh.ether_shost));
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from -> htype = ARPHRD_ETHER;
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from -> hlen = sizeof eh.ether_shost;
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return sizeof eh;
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}
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#endif /* PACKET_DECODING */
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