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 1.2 2004-03-17 23:24:38 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 const u_char *snapend;
  42
  43 struct symantec_header {
  44         u_int8_t  stuff1[6];
  45         u_int16_t ether_type;
  46         u_int8_t  stuff2[36];
  47 };
  48
  49 static inline void
  50 symantec_hdr_print(register const u_char *bp, u_int length)
  51 {
  52         register const struct symantec_header *sp;
  53         u_int16_t etype;
  54
  55         sp = (const struct symantec_header *)bp;
  56
  57         etype = ntohs(sp->ether_type);
  58         if (!qflag) {
  59                 if (etype <= ETHERMTU)
  60                           (void)printf(", invalid ethertype %u", etype);
  61                 else
  62                           (void)printf(", ethertype %s (0x%04x)",
  63                                        tok2str(ethertype_values,"Unknown", etype),
  64                                        etype);
  65         } else {
  66                 if (etype <= ETHERMTU)
  67                           (void)printf(", invalid ethertype %u", etype);
  68                 else
  69                           (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype));
  70         }
  71
  72         (void)printf(", length %u: ", length);
  73 }
  74
  75 /*
  76  * This is the top level routine of the printer.  'p' points
  77  * to the ether header of the packet, 'h->ts' is the timestamp,
  78  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  79  * is the number of bytes actually captured.
  80  */
  81 u_int
  82 symantec_if_print(const struct pcap_pkthdr *h, const u_char *p)
  83 {
  84         u_int length = h->len;
  85         u_int caplen = h->caplen;
  86         struct symantec_header *sp;
  87         u_short ether_type;
  88         u_short extracted_ether_type;
  89
  90         if (caplen < sizeof (struct symantec_header)) {
  91                 printf("[|syhmantec]");
  92                 return caplen;
  93         }
  94
  95         if (eflag)
  96                 symantec_hdr_print(p, length);
  97
  98         length -= sizeof (struct symantec_header);
  99         caplen -= sizeof (struct symantec_header);
 100         sp = (struct symantec_header *)p;
 101         p += sizeof (struct symantec_header);
 102
 103         ether_type = ntohs(sp->ether_type);
 104
 105         if (ether_type <= ETHERMTU) {
 106                 /* ether_type not known, print raw packet */
 107                 if (!eflag)
 108                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 109
 110                 if (!xflag && !qflag)
 111                         default_print(p, caplen);
 112         } else if (ether_encap_print(ether_type, p, length, caplen,
 113             &extracted_ether_type) == 0) {
 114                 /* ether_type not known, print raw packet */
 115                 if (!eflag)
 116                         symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header));
 117
 118                 if (!xflag && !qflag)
 119                         default_print(p, caplen);
 120         }
 121
 122         return (sizeof (struct symantec_header));
 123 }