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 #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 "extract.h"
  37 #include "addrtoname.h"
  38 #include "ethertype.h"
  39
  40 #include "ether.h"
  41
  42 struct symantec_header {
  43         u_int8_t  stuff1[6];
  44         u_int16_t ether_type;
  45         u_int8_t  stuff2[36];
  46 };
  47
  48 static inline void
  49 symantec_hdr_print(register const u_char *bp, u_int length)
  50 {
  51         register const struct symantec_header *sp;
  52         u_int16_t etype;
  53
  54         sp = (const struct symantec_header *)bp;
  55
  56         etype = EXTRACT_16BITS(&sp->ether_type);
  57         if (!qflag) {
  58                 if (etype <= ETHERMTU)
  59                           (void)printf("invalid ethertype %u", etype);
  60                 else
  61                           (void)printf("ethertype %s (0x%04x)",
  62                                        tok2str(ethertype_values,"Unknown", etype),
  63                                        etype);
  64         } else {
  65                 if (etype <= ETHERMTU)
  66                           (void)printf("invalid ethertype %u", etype);
  67                 else
  68                           (void)printf("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
  69         }
  70
  71         (void)printf(", length %u: ", length);
  72 }
  73
  74 /*
  75  * This is the top level routine of the printer.  'p' points
  76  * to the ether header of the packet, 'h->ts' is the timestamp,
  77  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  78  * is the number of bytes actually captured.
  79  */
  80 u_int
  81 symantec_if_print(const struct pcap_pkthdr *h, const u_char *p)
  82 {
  83         u_int length = h->len;
  84         u_int caplen = h->caplen;
  85         struct symantec_header *sp;
  86         u_short ether_type;
  87         u_short extracted_ether_type;
  88
  89         if (caplen < sizeof (struct symantec_header)) {
  90                 printf("[|symantec]");
  91                 return caplen;
  92         }
  93
  94         if (eflag)
  95                 symantec_hdr_print(p, length);
  96
  97         length -= sizeof (struct symantec_header);
  98         caplen -= sizeof (struct symantec_header);
  99         sp = (struct symantec_header *)p;
 100         p += sizeof (struct symantec_header);
 101
 102         ether_type = EXTRACT_16BITS(&sp->ether_type);
 103
 104         if (ether_type <= ETHERMTU) {
 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         } else if (ether_encap_print(ether_type, p, length, caplen,
 112             &extracted_ether_type) == 0) {
 113                 /* ether_type not known, print raw packet */
 114                 if (!eflag)
 115                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 116
 117                 if (!suppress_default_print)
 118                         default_print(p, caplen);
 119         }
 120
 121         return (sizeof (struct symantec_header));
 122 }