The Tcpdump Group git mirrors - tcpdump/blob - print-dtp.c

   1 /*
   2  * Copyright (c) 1998-2007 The TCPDUMP project
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that: (1) source code
   6  * distributions retain the above copyright notice and this paragraph
   7  * in its entirety, and (2) distributions including binary code include
   8  * the above copyright notice and this paragraph in its entirety in
   9  * the documentation or other materials provided with the distribution.
  10  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  11  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  12  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  13  * FOR A PARTICULAR PURPOSE.
  14  *
  15  * Dynamic Trunk Protocol (DTP)
  16  *
  17  * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
  18  */
  19
  20 #define NETDISSECT_REWORKED
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <tcpdump-stdinc.h>
  26
  27 #include "interface.h"
  28 #include "addrtoname.h"
  29 #include "extract.h"
  30
  31 #define DTP_HEADER_LEN                  1
  32 #define DTP_DOMAIN_TLV                  0x0001
  33 #define DTP_STATUS_TLV                  0x0002
  34 #define DTP_DTP_TYPE_TLV                0x0003
  35 #define DTP_NEIGHBOR_TLV                0x0004
  36
  37 static const struct tok dtp_tlv_values[] = {
  38     { DTP_DOMAIN_TLV, "Domain TLV"},
  39     { DTP_STATUS_TLV, "Status TLV"},
  40     { DTP_DTP_TYPE_TLV, "DTP type TLV"},
  41     { DTP_NEIGHBOR_TLV, "Neighbor TLV"},
  42     { 0, NULL}
  43 };
  44
  45 void
  46 dtp_print (netdissect_options *ndo, const u_char *pptr, u_int length)
  47 {
  48     int type, len;
  49     const u_char *tptr;
  50
  51     if (length < DTP_HEADER_LEN)
  52         goto trunc;
  53
  54     tptr = pptr;
  55
  56     if (!ND_TTEST2(*tptr, DTP_HEADER_LEN))
  57         goto trunc;
  58
  59     ND_PRINT((ndo, "DTPv%u, length %u",
  60            (*tptr),
  61            length));
  62
  63     /*
  64      * In non-verbose mode, just print version.
  65      */
  66     if (ndo->ndo_vflag < 1) {
  67         return;
  68     }
  69
  70     tptr += DTP_HEADER_LEN;
  71
  72     while (tptr < (pptr+length)) {
  73
  74         if (!ND_TTEST2(*tptr, 4))
  75             goto trunc;
  76
  77         type = EXTRACT_16BITS(tptr);
  78         len  = EXTRACT_16BITS(tptr+2);
  79
  80         /* infinite loop check */
  81         if (type == 0 || len == 0) {
  82             return;
  83         }
  84
  85         ND_PRINT((ndo, "\n\t%s (0x%04x) TLV, length %u",
  86                tok2str(dtp_tlv_values, "Unknown", type),
  87                type, len));
  88
  89         switch (type) {
  90         case DTP_DOMAIN_TLV:
  91                 ND_PRINT((ndo, ", %s", tptr+4));
  92                 break;
  93
  94         case DTP_STATUS_TLV:
  95         case DTP_DTP_TYPE_TLV:
  96                 ND_PRINT((ndo, ", 0x%x", *(tptr+4)));
  97                 break;
  98
  99         case DTP_NEIGHBOR_TLV:
 100                 ND_PRINT((ndo, ", %s", etheraddr_string(tptr+4)));
 101                 break;
 102
 103         default:
 104             break;
 105         }
 106         tptr += len;
 107     }
 108
 109     return;
 110
 111  trunc:
 112     ND_PRINT((ndo, "[|dtp]"));
 113 }
 114
 115 /*
 116  * Local Variables:
 117  * c-style: whitesmith
 118  * c-basic-offset: 4
 119  * End:
 120  */