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 #include "netdissect.h"
  31 #include "extract.h"
  32 #include "ethertype.h"
  33
  34 struct symantec_header {
  35         nd_byte     stuff1[6];
  36         nd_uint16_t ether_type;
  37         nd_byte     stuff2[36];
  38 };
  39
  40 static void
  41 symantec_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
  42 {
  43         const struct symantec_header *sp;
  44         uint16_t etype;
  45
  46         sp = (const struct symantec_header *)bp;
  47
  48         etype = EXTRACT_BE_U_2(sp->ether_type);
  49         if (!ndo->ndo_qflag) {
  50                 if (etype <= MAX_ETHERNET_LENGTH_VAL)
  51                           ND_PRINT("invalid ethertype %u", etype);
  52                 else
  53                           ND_PRINT("ethertype %s (0x%04x)",
  54                                        tok2str(ethertype_values,"Unknown", etype),
  55                                        etype);
  56         } else {
  57                 if (etype <= MAX_ETHERNET_LENGTH_VAL)
  58                           ND_PRINT("invalid ethertype %u", etype);
  59                 else
  60                           ND_PRINT("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
  61         }
  62
  63         ND_PRINT(", length %u: ", length);
  64 }
  65
  66 /*
  67  * This is the top level routine of the printer.  'p' points
  68  * to the ether header of the packet, 'h->ts' is the timestamp,
  69  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  70  * is the number of bytes actually captured.
  71  */
  72 u_int
  73 symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
  74 {
  75         u_int length = h->len;
  76         u_int caplen = h->caplen;
  77         const struct symantec_header *sp;
  78         u_short ether_type;
  79
  80         ndo->ndo_protocol = "symantec_if";
  81         if (caplen < sizeof (struct symantec_header)) {
  82                 ND_PRINT("[|symantec]");
  83                 return caplen;
  84         }
  85
  86         if (ndo->ndo_eflag)
  87                 symantec_hdr_print(ndo, p, length);
  88
  89         length -= sizeof (struct symantec_header);
  90         caplen -= sizeof (struct symantec_header);
  91         sp = (const struct symantec_header *)p;
  92         p += sizeof (struct symantec_header);
  93
  94         ether_type = EXTRACT_BE_U_2(sp->ether_type);
  95
  96         if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
  97                 /* ether_type not known, print raw packet */
  98                 if (!ndo->ndo_eflag)
  99                         symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
 100
 101                 if (!ndo->ndo_suppress_default_print)
 102                         ND_DEFAULTPRINT(p, caplen);
 103         } else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
 104                 /* ether_type not known, print raw packet */
 105                 if (!ndo->ndo_eflag)
 106                         symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
 107
 108                 if (!ndo->ndo_suppress_default_print)
 109                         ND_DEFAULTPRINT(p, caplen);
 110         }
 111
 112         return (sizeof (struct symantec_header));
 113 }