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 #include <pcap.h>
  30
  31 #include "interface.h"
  32 #include "extract.h"
  33 #include "addrtoname.h"
  34 #include "ethertype.h"
  35
  36 #include "ether.h"
  37
  38 struct symantec_header {
  39         u_int8_t  stuff1[6];
  40         u_int16_t ether_type;
  41         u_int8_t  stuff2[36];
  42 };
  43
  44 static inline void
  45 symantec_hdr_print(register const u_char *bp, u_int length)
  46 {
  47         register const struct symantec_header *sp;
  48         u_int16_t etype;
  49
  50         sp = (const struct symantec_header *)bp;
  51
  52         etype = EXTRACT_16BITS(&sp->ether_type);
  53         if (!qflag) {
  54                 if (etype <= ETHERMTU)
  55                           (void)printf("invalid ethertype %u", etype);
  56                 else
  57                           (void)printf("ethertype %s (0x%04x)",
  58                                        tok2str(ethertype_values,"Unknown", etype),
  59                                        etype);
  60         } else {
  61                 if (etype <= ETHERMTU)
  62                           (void)printf("invalid ethertype %u", etype);
  63                 else
  64                           (void)printf("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
  65         }
  66
  67         (void)printf(", length %u: ", length);
  68 }
  69
  70 /*
  71  * This is the top level routine of the printer.  'p' points
  72  * to the ether header of the packet, 'h->ts' is the timestamp,
  73  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  74  * is the number of bytes actually captured.
  75  */
  76 u_int
  77 symantec_if_print(const struct pcap_pkthdr *h, const u_char *p)
  78 {
  79         u_int length = h->len;
  80         u_int caplen = h->caplen;
  81         struct symantec_header *sp;
  82         u_short ether_type;
  83
  84         if (caplen < sizeof (struct symantec_header)) {
  85                 printf("[|symantec]");
  86                 return caplen;
  87         }
  88
  89         if (eflag)
  90                 symantec_hdr_print(p, length);
  91
  92         length -= sizeof (struct symantec_header);
  93         caplen -= sizeof (struct symantec_header);
  94         sp = (struct symantec_header *)p;
  95         p += sizeof (struct symantec_header);
  96
  97         ether_type = EXTRACT_16BITS(&sp->ether_type);
  98
  99         if (ether_type <= ETHERMTU) {
 100                 /* ether_type not known, print raw packet */
 101                 if (!eflag)
 102                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 103
 104                 if (!suppress_default_print)
 105                         default_print(p, caplen);
 106         } else if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) {
 107                 /* ether_type not known, print raw packet */
 108                 if (!eflag)
 109                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 110
 111                 if (!suppress_default_print)
 112                         default_print(p, caplen);
 113         }
 114
 115         return (sizeof (struct symantec_header));
 116 }