contrib/tcpdump/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 #ifndef lint
  22 static const char rcsid[] _U_ =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-symantec.c,v 1.5 2005-07-07 01:22:21 guy Exp $ (LBL)";
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <tcpdump-stdinc.h>
  31
  32 #include <stdio.h>
  33 #include <pcap.h>
  34
  35 #include "interface.h"
  36 #include "addrtoname.h"
  37 #include "ethertype.h"
  38
  39 #include "ether.h"
  40
  41 struct symantec_header {
  42         u_int8_t  stuff1[6];
  43         u_int16_t ether_type;
  44         u_int8_t  stuff2[36];
  45 };
  46
  47 static inline void
  48 symantec_hdr_print(register const u_char *bp, u_int length)
  49 {
  50         register const struct symantec_header *sp;
  51         u_int16_t etype;
  52
  53         sp = (const struct symantec_header *)bp;
  54
  55         etype = ntohs(sp->ether_type);
  56         if (!qflag) {
  57                 if (etype <= ETHERMTU)
  58                           (void)printf("invalid ethertype %u", etype);
  59                 else
  60                           (void)printf("ethertype %s (0x%04x)",
  61                                        tok2str(ethertype_values,"Unknown", etype),
  62                                        etype);
  63         } else {
  64                 if (etype <= ETHERMTU)
  65                           (void)printf("invalid ethertype %u", etype);
  66                 else
  67                           (void)printf("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
  68         }
  69
  70         (void)printf(", length %u: ", length);
  71 }
  72
  73 /*
  74  * This is the top level routine of the printer.  'p' points
  75  * to the ether header of the packet, 'h->ts' is the timestamp,
  76  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  77  * is the number of bytes actually captured.
  78  */
  79 u_int
  80 symantec_if_print(const struct pcap_pkthdr *h, const u_char *p)
  81 {
  82         u_int length = h->len;
  83         u_int caplen = h->caplen;
  84         struct symantec_header *sp;
  85         u_short ether_type;
  86         u_short extracted_ether_type;
  87
  88         if (caplen < sizeof (struct symantec_header)) {
  89                 printf("[|symantec]");
  90                 return caplen;
  91         }
  92
  93         if (eflag)
  94                 symantec_hdr_print(p, length);
  95
  96         length -= sizeof (struct symantec_header);
  97         caplen -= sizeof (struct symantec_header);
  98         sp = (struct symantec_header *)p;
  99         p += sizeof (struct symantec_header);
 100
 101         ether_type = ntohs(sp->ether_type);
 102
 103         if (ether_type <= ETHERMTU) {
 104                 /* ether_type not known, print raw packet */
 105                 if (!eflag)
 106                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 107
 108                 if (!suppress_default_print)
 109                         default_print(p, caplen);
 110         } else if (ether_encap_print(ether_type, p, length, caplen,
 111             &extracted_ether_type) == 0) {
 112                 /* ether_type not known, print raw packet */
 113                 if (!eflag)
 114                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 115
 116                 if (!suppress_default_print)
 117                         default_print(p, caplen);
 118         }
 119
 120         return (sizeof (struct symantec_header));
 121 }