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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29
  30 #include "interface.h"
  31 #include "extract.h"
  32 #include "ethertype.h"
  33
  34 #include "ether.h"
  35
  36 struct symantec_header {
  37         u_int8_t  stuff1[6];
  38         u_int16_t ether_type;
  39         u_int8_t  stuff2[36];
  40 };
  41
  42 static inline void
  43 symantec_hdr_print(register const u_char *bp, u_int length)
  44 {
  45         register const struct symantec_header *sp;
  46         u_int16_t etype;
  47
  48         sp = (const struct symantec_header *)bp;
  49
  50         etype = EXTRACT_16BITS(&sp->ether_type);
  51         if (!qflag) {
  52                 if (etype <= ETHERMTU)
  53                           (void)printf("invalid ethertype %u", etype);
  54                 else
  55                           (void)printf("ethertype %s (0x%04x)",
  56                                        tok2str(ethertype_values,"Unknown", etype),
  57                                        etype);
  58         } else {
  59                 if (etype <= ETHERMTU)
  60                           (void)printf("invalid ethertype %u", etype);
  61                 else
  62                           (void)printf("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
  63         }
  64
  65         (void)printf(", length %u: ", length);
  66 }
  67
  68 /*
  69  * This is the top level routine of the printer.  'p' points
  70  * to the ether header of the packet, 'h->ts' is the timestamp,
  71  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  72  * is the number of bytes actually captured.
  73  */
  74 u_int
  75 symantec_if_print(const struct pcap_pkthdr *h, const u_char *p)
  76 {
  77         u_int length = h->len;
  78         u_int caplen = h->caplen;
  79         struct symantec_header *sp;
  80         u_short ether_type;
  81
  82         if (caplen < sizeof (struct symantec_header)) {
  83                 printf("[|symantec]");
  84                 return caplen;
  85         }
  86
  87         if (eflag)
  88                 symantec_hdr_print(p, length);
  89
  90         length -= sizeof (struct symantec_header);
  91         caplen -= sizeof (struct symantec_header);
  92         sp = (struct symantec_header *)p;
  93         p += sizeof (struct symantec_header);
  94
  95         ether_type = EXTRACT_16BITS(&sp->ether_type);
  96
  97         if (ether_type <= ETHERMTU) {
  98                 /* ether_type not known, print raw packet */
  99                 if (!eflag)
 100                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 101
 102                 if (!suppress_default_print)
 103                         default_print(p, caplen);
 104         } else if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) {
 105                 /* ether_type not known, print raw packet */
 106                 if (!eflag)
 107                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 108
 109                 if (!suppress_default_print)
 110                         default_print(p, caplen);
 111         }
 112
 113         return (sizeof (struct symantec_header));
 114 }