The Tcpdump Group git mirrors - tcpdump/blob - print-symantec.c

   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
  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
  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 }