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#include <sys/cdefs.h>
23#ifndef lint
24__RCSID("$NetBSD: print-symantec.c,v 1.7 2023/08/17 20:19:40 christos Exp $");
25#endif
26
27/* \summary: Symantec Enterprise Firewall printer */
28
29#ifdef HAVE_CONFIG_H
30#include <config.h>
31#endif
32
33#include "netdissect-stdinc.h"
34
35#define ND_LONGJMP_FROM_TCHECK
36#include "netdissect.h"
37#include "extract.h"
38#include "ethertype.h"
39
40struct symantec_header {
41	nd_byte     stuff1[6];
42	nd_uint16_t ether_type;
43	nd_byte     stuff2[36];
44};
45
46static void
47symantec_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
48{
49	const struct symantec_header *sp;
50	uint16_t etype;
51
52	sp = (const struct symantec_header *)bp;
53
54	etype = GET_BE_U_2(sp->ether_type);
55	if (!ndo->ndo_qflag) {
56	        if (etype <= MAX_ETHERNET_LENGTH_VAL)
57		          ND_PRINT("invalid ethertype %u", etype);
58                else
59		          ND_PRINT("ethertype %s (0x%04x)",
60				       tok2str(ethertype_values,"Unknown", etype),
61                                       etype);
62        } else {
63                if (etype <= MAX_ETHERNET_LENGTH_VAL)
64                          ND_PRINT("invalid ethertype %u", etype);
65                else
66                          ND_PRINT("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
67        }
68
69	ND_PRINT(", length %u: ", length);
70}
71
72/*
73 * This is the top level routine of the printer.  'p' points
74 * to the ether header of the packet, 'h->ts' is the timestamp,
75 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
76 * is the number of bytes actually captured.
77 */
78void
79symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
80{
81	u_int length = h->len;
82	u_int caplen = h->caplen;
83	const struct symantec_header *sp;
84	u_short ether_type;
85
86	ndo->ndo_protocol = "symantec";
87	ND_TCHECK_LEN(p, sizeof(struct symantec_header));
88
89	ndo->ndo_ll_hdr_len += sizeof (struct symantec_header);
90	if (ndo->ndo_eflag)
91		symantec_hdr_print(ndo, p, length);
92
93	length -= sizeof (struct symantec_header);
94	caplen -= sizeof (struct symantec_header);
95	sp = (const struct symantec_header *)p;
96	p += sizeof (struct symantec_header);
97
98	ether_type = GET_BE_U_2(sp->ether_type);
99
100	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
101		/* ether_type not known, print raw packet */
102		if (!ndo->ndo_eflag)
103			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
104
105		if (!ndo->ndo_suppress_default_print)
106			ND_DEFAULTPRINT(p, caplen);
107	} else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
108		/* ether_type not known, print raw packet */
109		if (!ndo->ndo_eflag)
110			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
111
112		if (!ndo->ndo_suppress_default_print)
113			ND_DEFAULTPRINT(p, caplen);
114	}
115}
116