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
36 struct symantec_header {
37 uint8_t stuff1[6];
38 uint16_t ether_type;
39 uint8_t stuff2[36];
40 };
41
42 static inline void
symantec_hdr_print(netdissect_options * ndo,register const u_char * bp,u_int length)43 symantec_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 */
74 u_int
symantec_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)75 symantec_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