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
22/* \summary: Symantec Enterprise Firewall printer */
23
24#ifdef HAVE_CONFIG_H
25#include "config.h"
26#endif
27
28#include <netdissect-stdinc.h>
29
30#include "netdissect.h"
31#include "extract.h"
32#include "ethertype.h"
33
34#include "ether.h"
35
36struct symantec_header {
37	uint8_t  stuff1[6];
38	uint16_t ether_type;
39	uint8_t  stuff2[36];
40};
41
42static inline void
43symantec_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length)
44{
45	register const struct symantec_header *sp;
46	uint16_t etype;
47
48	sp = (const struct symantec_header *)bp;
49
50	etype = EXTRACT_16BITS(&sp->ether_type);
51	if (!ndo->ndo_qflag) {
52	        if (etype <= ETHERMTU)
53		          ND_PRINT((ndo, "invalid ethertype %u", etype));
54                else
55		          ND_PRINT((ndo, "ethertype %s (0x%04x)",
56				       tok2str(ethertype_values,"Unknown", etype),
57                                       etype));
58        } else {
59                if (etype <= ETHERMTU)
60                          ND_PRINT((ndo, "invalid ethertype %u", etype));
61                else
62                          ND_PRINT((ndo, "%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype)));
63        }
64
65	ND_PRINT((ndo, ", length %u: ", length));
66}
67
68/*
69 * This is the top level routine of the printer.  'p' points
70 * to the ether header of the packet, 'h->ts' is the timestamp,
71 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
72 * is the number of bytes actually captured.
73 */
74u_int
75symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
76{
77	u_int length = h->len;
78	u_int caplen = h->caplen;
79	const struct symantec_header *sp;
80	u_short ether_type;
81
82	if (caplen < sizeof (struct symantec_header)) {
83		ND_PRINT((ndo, "[|symantec]"));
84		return caplen;
85	}
86
87	if (ndo->ndo_eflag)
88		symantec_hdr_print(ndo, p, length);
89
90	length -= sizeof (struct symantec_header);
91	caplen -= sizeof (struct symantec_header);
92	sp = (const struct symantec_header *)p;
93	p += sizeof (struct symantec_header);
94
95	ether_type = EXTRACT_16BITS(&sp->ether_type);
96
97	if (ether_type <= ETHERMTU) {
98		/* ether_type not known, print raw packet */
99		if (!ndo->ndo_eflag)
100			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
101
102		if (!ndo->ndo_suppress_default_print)
103			ND_DEFAULTPRINT(p, caplen);
104	} else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
105		/* ether_type not known, print raw packet */
106		if (!ndo->ndo_eflag)
107			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
108
109		if (!ndo->ndo_suppress_default_print)
110			ND_DEFAULTPRINT(p, caplen);
111	}
112
113	return (sizeof (struct symantec_header));
114}
115