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
35 struct symantec_header {
36 nd_byte stuff1[6];
37 nd_uint16_t ether_type;
38 nd_byte stuff2[36];
39 };
40
41 static void
symantec_hdr_print(netdissect_options * ndo,const u_char * bp,u_int length)42 symantec_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 */
73 void
symantec_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)74 symantec_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