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#define ND_LONGJMP_FROM_TCHECK
31#include "netdissect.h"
32#include "extract.h"
33#include "ethertype.h"
34
35struct symantec_header {
36	nd_byte     stuff1[6];
37	nd_uint16_t ether_type;
38	nd_byte     stuff2[36];
39};
40
41static void
42symantec_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
43{
44	const struct symantec_header *sp;
45	uint16_t etype;
46
47	sp = (const struct symantec_header *)bp;
48
49	etype = GET_BE_U_2(sp->ether_type);
50	if (!ndo->ndo_qflag) {
51	        if (etype <= MAX_ETHERNET_LENGTH_VAL)
52		          ND_PRINT("invalid ethertype %u", etype);
53                else
54		          ND_PRINT("ethertype %s (0x%04x)",
55				       tok2str(ethertype_values,"Unknown", etype),
56                                       etype);
57        } else {
58                if (etype <= MAX_ETHERNET_LENGTH_VAL)
59                          ND_PRINT("invalid ethertype %u", etype);
60                else
61                          ND_PRINT("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
62        }
63
64	ND_PRINT(", length %u: ", length);
65}
66
67/*
68 * This is the top level routine of the printer.  'p' points
69 * to the ether header of the packet, 'h->ts' is the timestamp,
70 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
71 * is the number of bytes actually captured.
72 */
73void
74symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
75{
76	u_int length = h->len;
77	u_int caplen = h->caplen;
78	const struct symantec_header *sp;
79	u_short ether_type;
80
81	ndo->ndo_protocol = "symantec";
82	ND_TCHECK_LEN(p, sizeof(struct symantec_header));
83
84	ndo->ndo_ll_hdr_len += sizeof (struct symantec_header);
85	if (ndo->ndo_eflag)
86		symantec_hdr_print(ndo, p, length);
87
88	length -= sizeof (struct symantec_header);
89	caplen -= sizeof (struct symantec_header);
90	sp = (const struct symantec_header *)p;
91	p += sizeof (struct symantec_header);
92
93	ether_type = GET_BE_U_2(sp->ether_type);
94
95	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
96		/* ether_type not known, print raw packet */
97		if (!ndo->ndo_eflag)
98			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
99
100		if (!ndo->ndo_suppress_default_print)
101			ND_DEFAULTPRINT(p, caplen);
102	} else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
103		/* ether_type not known, print raw packet */
104		if (!ndo->ndo_eflag)
105			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
106
107		if (!ndo->ndo_suppress_default_print)
108			ND_DEFAULTPRINT(p, caplen);
109	}
110}
111