print-symantec.c revision 214478 
1204076Spjd/*
2204076Spjd * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3204076Spjd *	The Regents of the University of California.  All rights reserved.
4204076Spjd *
5204076Spjd * Redistribution and use in source and binary forms, with or without
6204076Spjd * modification, are permitted provided that: (1) source code distributions
7204076Spjd * retain the above copyright notice and this paragraph in its entirety, (2)
8204076Spjd * distributions including binary code include the above copyright notice and
9204076Spjd * this paragraph in its entirety in the documentation or other materials
10204076Spjd * provided with the distribution, and (3) all advertising materials mentioning
11204076Spjd * features or use of this software display the following acknowledgement:
12204076Spjd * ``This product includes software developed by the University of California,
13204076Spjd * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14204076Spjd * the University nor the names of its contributors may be used to endorse
15204076Spjd * or promote products derived from this software without specific prior
16204076Spjd * written permission.
17204076Spjd * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18204076Spjd * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19204076Spjd * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20204076Spjd */
21204076Spjd#ifndef lint
22204076Spjdstatic const char rcsid[] _U_ =
23204076Spjd    "@(#) $Header: /tcpdump/master/tcpdump/print-symantec.c,v 1.5 2005-07-07 01:22:21 guy Exp $ (LBL)";
24204076Spjd#endif
25204076Spjd
26204076Spjd#ifdef HAVE_CONFIG_H
27204076Spjd#include "config.h"
28204076Spjd#endif
29204076Spjd
30204076Spjd#include <tcpdump-stdinc.h>
31204076Spjd
32204076Spjd#include <stdio.h>
33204076Spjd#include <pcap.h>
34204076Spjd
35204076Spjd#include "interface.h"
36204076Spjd#include "extract.h"
37#include "addrtoname.h"
38#include "ethertype.h"
39
40#include "ether.h"
41
42struct symantec_header {
43	u_int8_t  stuff1[6];
44	u_int16_t ether_type;
45	u_int8_t  stuff2[36];
46};
47
48static inline void
49symantec_hdr_print(register const u_char *bp, u_int length)
50{
51	register const struct symantec_header *sp;
52	u_int16_t etype;
53
54	sp = (const struct symantec_header *)bp;
55
56	etype = EXTRACT_16BITS(&sp->ether_type);
57	if (!qflag) {
58	        if (etype <= ETHERMTU)
59		          (void)printf("invalid ethertype %u", etype);
60                else
61		          (void)printf("ethertype %s (0x%04x)",
62				       tok2str(ethertype_values,"Unknown", etype),
63                                       etype);
64        } else {
65                if (etype <= ETHERMTU)
66                          (void)printf("invalid ethertype %u", etype);
67                else
68                          (void)printf("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
69        }
70
71	(void)printf(", length %u: ", length);
72}
73
74/*
75 * This is the top level routine of the printer.  'p' points
76 * to the ether header of the packet, 'h->ts' is the timestamp,
77 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
78 * is the number of bytes actually captured.
79 */
80u_int
81symantec_if_print(const struct pcap_pkthdr *h, const u_char *p)
82{
83	u_int length = h->len;
84	u_int caplen = h->caplen;
85	struct symantec_header *sp;
86	u_short ether_type;
87
88	if (caplen < sizeof (struct symantec_header)) {
89		printf("[|symantec]");
90		return caplen;
91	}
92
93	if (eflag)
94		symantec_hdr_print(p, length);
95
96	length -= sizeof (struct symantec_header);
97	caplen -= sizeof (struct symantec_header);
98	sp = (struct symantec_header *)p;
99	p += sizeof (struct symantec_header);
100
101	ether_type = EXTRACT_16BITS(&sp->ether_type);
102
103	if (ether_type <= ETHERMTU) {
104		/* ether_type not known, print raw packet */
105		if (!eflag)
106			symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
107
108		if (!suppress_default_print)
109			default_print(p, caplen);
110	} else if (ethertype_print(ether_type, p, length, caplen) == 0) {
111		/* ether_type not known, print raw packet */
112		if (!eflag)
113			symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
114
115		if (!suppress_default_print)
116			default_print(p, caplen);
117	}
118
119	return (sizeof (struct symantec_header));
120}
121