print-ap1394.c revision 127668 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21#ifndef lint
22static const char rcsid[] _U_ =
23    "@(#) $Header: /tcpdump/master/tcpdump/print-ap1394.c,v 1.1.2.1 2004/03/17 22:15:53 guy Exp $ (LBL)";
24#endif
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <tcpdump-stdinc.h>
31
32#include <stdio.h>
33#include <pcap.h>
34
35#include "interface.h"
36#include "addrtoname.h"
37#include "ethertype.h"
38
39/*
40 * Structure of a header for Apple's IP-over-IEEE 1384 BPF header.
41 */
42#define FIREWIRE_EUI64_LEN	8
43struct firewire_header {
44	u_char  firewire_dhost[FIREWIRE_EUI64_LEN];
45	u_char  firewire_shost[FIREWIRE_EUI64_LEN];
46	u_short firewire_type;
47};
48
49/*
50 * Length of that header; note that some compilers may pad
51 * "struct firewire_header" to a multiple of 4 bytes, for example, so
52 * "sizeof (struct firewire_header)" may not give the right answer.
53 */
54#define FIREWIRE_HDRLEN		18
55
56static inline void
57ap1394_hdr_print(register const u_char *bp, u_int length)
58{
59	register const struct firewire_header *fp;
60	fp = (const struct firewire_header *)bp;
61
62	(void)printf("%s > %s",
63		     linkaddr_string(fp->firewire_dhost, FIREWIRE_EUI64_LEN),
64		     linkaddr_string(fp->firewire_shost, FIREWIRE_EUI64_LEN));
65
66	if (!qflag) {
67		(void)printf(", ethertype %s (0x%04x)",
68			       tok2str(ethertype_values,"Unknown", ntohs(fp->firewire_type)),
69                               ntohs(fp->firewire_type));
70        } else {
71                (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(fp->firewire_type)));
72        }
73
74	(void)printf(", length %u: ", length);
75}
76
77/*
78 * This is the top level routine of the printer.  'p' points
79 * to the ether header of the packet, 'h->ts' is the timestamp,
80 * 'h->length' is the length of the packet off the wire, and 'h->caplen'
81 * is the number of bytes actually captured.
82 */
83u_int
84ap1394_if_print(const struct pcap_pkthdr *h, const u_char *p)
85{
86	u_int length = h->len;
87	u_int caplen = h->caplen;
88	struct firewire_header *fp;
89	u_short ether_type;
90	u_short extracted_ether_type;
91
92	if (caplen < FIREWIRE_HDRLEN) {
93		printf("[|ap1394]");
94		return FIREWIRE_HDRLEN;
95	}
96
97	if (eflag)
98		ap1394_hdr_print(p, length);
99
100	length -= FIREWIRE_HDRLEN;
101	caplen -= FIREWIRE_HDRLEN;
102	fp = (struct firewire_header *)p;
103	p += FIREWIRE_HDRLEN;
104
105	ether_type = ntohs(fp->firewire_type);
106
107	extracted_ether_type = 0;
108	if (ether_encap_print(ether_type, p, length, caplen,
109	    &extracted_ether_type) == 0) {
110		/* ether_type not known, print raw packet */
111		if (!eflag)
112			ap1394_hdr_print((u_char *)fp, length + FIREWIRE_HDRLEN);
113
114		if (!xflag && !qflag)
115			default_print(p, caplen);
116	}
117
118	return FIREWIRE_HDRLEN;
119}
120