external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: print-symantec.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  25 #endif
  26
  27 #define NETDISSECT_REWORKED
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include "interface.h"
  35 #include "extract.h"
  36 #include "ethertype.h"
  37
  38 #include "ether.h"
  39
  40 struct symantec_header {
  41         uint8_t  stuff1[6];
  42         uint16_t ether_type;
  43         uint8_t  stuff2[36];
  44 };
  45
  46 static inline void
  47 symantec_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length)
  48 {
  49         register const struct symantec_header *sp;
  50         uint16_t etype;
  51
  52         sp = (const struct symantec_header *)bp;
  53
  54         etype = EXTRACT_16BITS(&sp->ether_type);
  55         if (!ndo->ndo_qflag) {
  56                 if (etype <= ETHERMTU)
  57                           ND_PRINT((ndo, "invalid ethertype %u", etype));
  58                 else
  59                           ND_PRINT((ndo, "ethertype %s (0x%04x)",
  60                                        tok2str(ethertype_values,"Unknown", etype),
  61                                        etype));
  62         } else {
  63                 if (etype <= ETHERMTU)
  64                           ND_PRINT((ndo, "invalid ethertype %u", etype));
  65                 else
  66                           ND_PRINT((ndo, "%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype)));
  67         }
  68
  69         ND_PRINT((ndo, ", length %u: ", length));
  70 }
  71
  72 /*
  73  * This is the top level routine of the printer.  'p' points
  74  * to the ether header of the packet, 'h->ts' is the timestamp,
  75  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  76  * is the number of bytes actually captured.
  77  */
  78 u_int
  79 symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
  80 {
  81         u_int length = h->len;
  82         u_int caplen = h->caplen;
  83         struct symantec_header *sp;
  84         u_short ether_type;
  85
  86         if (caplen < sizeof (struct symantec_header)) {
  87                 ND_PRINT((ndo, "[|symantec]"));
  88                 return caplen;
  89         }
  90
  91         if (ndo->ndo_eflag)
  92                 symantec_hdr_print(ndo, p, length);
  93
  94         length -= sizeof (struct symantec_header);
  95         caplen -= sizeof (struct symantec_header);
  96         sp = (struct symantec_header *)p;
  97         p += sizeof (struct symantec_header);
  98
  99         ether_type = EXTRACT_16BITS(&sp->ether_type);
 100
 101         if (ether_type <= ETHERMTU) {
 102                 /* ether_type not known, print raw packet */
 103                 if (!ndo->ndo_eflag)
 104                         symantec_hdr_print(ndo, (u_char *)sp, length + sizeof (struct symantec_header));
 105
 106                 if (!ndo->ndo_suppress_default_print)
 107                         ND_DEFAULTPRINT(p, caplen);
 108         } else if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 109                 /* ether_type not known, print raw packet */
 110                 if (!ndo->ndo_eflag)
 111                         symantec_hdr_print(ndo, (u_char *)sp, length + sizeof (struct symantec_header));
 112
 113                 if (!ndo->ndo_suppress_default_print)
 114                         ND_DEFAULTPRINT(p, caplen);
 115         }
 116
 117         return (sizeof (struct symantec_header));
 118 }