print-symantec.c revision 1.6 
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 1.6 2017/02/05 04:05:05 spz 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#include "netdissect.h"
36#include "extract.h"
37#include "ethertype.h"
38
39#include "ether.h"
40
41struct symantec_header {
42	uint8_t  stuff1[6];
43	uint16_t ether_type;
44	uint8_t  stuff2[36];
45};
46
47static inline void
48symantec_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length)
49{
50	register const struct symantec_header *sp;
51	uint16_t etype;
52
53	sp = (const struct symantec_header *)bp;
54
55	etype = EXTRACT_16BITS(&sp->ether_type);
56	if (!ndo->ndo_qflag) {
57	        if (etype <= ETHERMTU)
58		          ND_PRINT((ndo, "invalid ethertype %u", etype));
59                else
60		          ND_PRINT((ndo, "ethertype %s (0x%04x)",
61				       tok2str(ethertype_values,"Unknown", etype),
62                                       etype));
63        } else {
64                if (etype <= ETHERMTU)
65                          ND_PRINT((ndo, "invalid ethertype %u", etype));
66                else
67                          ND_PRINT((ndo, "%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype)));
68        }
69
70	ND_PRINT((ndo, ", length %u: ", length));
71}
72
73/*
74 * This is the top level routine of the printer.  'p' points
75 * to the ether header of the packet, 'h->ts' is the timestamp,
76 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
77 * is the number of bytes actually captured.
78 */
79u_int
80symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
81{
82	u_int length = h->len;
83	u_int caplen = h->caplen;
84	const struct symantec_header *sp;
85	u_short ether_type;
86
87	if (caplen < sizeof (struct symantec_header)) {
88		ND_PRINT((ndo, "[|symantec]"));
89		return caplen;
90	}
91
92	if (ndo->ndo_eflag)
93		symantec_hdr_print(ndo, p, length);
94
95	length -= sizeof (struct symantec_header);
96	caplen -= sizeof (struct symantec_header);
97	sp = (const struct symantec_header *)p;
98	p += sizeof (struct symantec_header);
99
100	ether_type = EXTRACT_16BITS(&sp->ether_type);
101
102	if (ether_type <= ETHERMTU) {
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	} else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
110		/* ether_type not known, print raw packet */
111		if (!ndo->ndo_eflag)
112			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
113
114		if (!ndo->ndo_suppress_default_print)
115			ND_DEFAULTPRINT(p, caplen);
116	}
117
118	return (sizeof (struct symantec_header));
119}
120