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print-symantec.c revision 1.8 
      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 1.8 2024/09/02 16:15:33 christos Exp $");
     25 #endif
     26 
     27 /* \summary: Symantec Enterprise Firewall printer */
     28 
     29 #include <config.h>
     30 
     31 #include "netdissect-stdinc.h"
     32 
     33 #define ND_LONGJMP_FROM_TCHECK
     34 #include "netdissect.h"
     35 #include "extract.h"
     36 #include "ethertype.h"
     37 
     38 struct symantec_header {
     39 	nd_byte     stuff1[6];
     40 	nd_uint16_t ether_type;
     41 	nd_byte     stuff2[36];
     42 };
     43 
     44 static void
     45 symantec_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
     46 {
     47 	const struct symantec_header *sp;
     48 	uint16_t etype;
     49 
     50 	sp = (const struct symantec_header *)bp;
     51 
     52 	etype = GET_BE_U_2(sp->ether_type);
     53 	if (!ndo->ndo_qflag) {
     54 	        if (etype <= MAX_ETHERNET_LENGTH_VAL)
     55 		          ND_PRINT("invalid ethertype %u", etype);
     56                 else
     57 		          ND_PRINT("ethertype %s (0x%04x)",
     58 				       tok2str(ethertype_values,"Unknown", etype),
     59                                        etype);
     60         } else {
     61                 if (etype <= MAX_ETHERNET_LENGTH_VAL)
     62                           ND_PRINT("invalid ethertype %u", etype);
     63                 else
     64                           ND_PRINT("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
     65         }
     66 
     67 	ND_PRINT(", length %u: ", length);
     68 }
     69 
     70 /*
     71  * This is the top level routine of the printer.  'p' points
     72  * to the ether header of the packet, 'h->ts' is the timestamp,
     73  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
     74  * is the number of bytes actually captured.
     75  */
     76 void
     77 symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
     78 {
     79 	u_int length = h->len;
     80 	u_int caplen = h->caplen;
     81 	const struct symantec_header *sp;
     82 	u_short ether_type;
     83 
     84 	ndo->ndo_protocol = "symantec";
     85 	ND_TCHECK_LEN(p, sizeof(struct symantec_header));
     86 
     87 	ndo->ndo_ll_hdr_len += sizeof (struct symantec_header);
     88 	if (ndo->ndo_eflag)
     89 		symantec_hdr_print(ndo, p, length);
     90 
     91 	length -= sizeof (struct symantec_header);
     92 	caplen -= sizeof (struct symantec_header);
     93 	sp = (const struct symantec_header *)p;
     94 	p += sizeof (struct symantec_header);
     95 
     96 	ether_type = GET_BE_U_2(sp->ether_type);
     97 
     98 	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
     99 		/* ether_type not known, print raw packet */
    100 		if (!ndo->ndo_eflag)
    101 			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
    102 
    103 		if (!ndo->ndo_suppress_default_print)
    104 			ND_DEFAULTPRINT(p, caplen);
    105 	} else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
    106 		/* ether_type not known, print raw packet */
    107 		if (!ndo->ndo_eflag)
    108 			symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
    109 
    110 		if (!ndo->ndo_suppress_default_print)
    111 			ND_DEFAULTPRINT(p, caplen);
    112 	}
    113 }
    114