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