contrib/tcpdump/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 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <tcpdump-stdinc.h>
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "interface.h"
  30 #include "addrtoname.h"
  31 #include "extract.h"
  32 #include "nlpid.h"
  33
  34 #define DTP_HEADER_LEN                  1
  35 #define DTP_DOMAIN_TLV                  0x0001
  36 #define DTP_STATUS_TLV                  0x0002
  37 #define DTP_DTP_TYPE_TLV                0x0003
  38 #define DTP_NEIGHBOR_TLV                0x0004
  39
  40 static struct tok dtp_tlv_values[] = {
  41     { DTP_DOMAIN_TLV, "Domain TLV"},
  42     { DTP_STATUS_TLV, "Status TLV"},
  43     { DTP_DTP_TYPE_TLV, "DTP type TLV"},
  44     { DTP_NEIGHBOR_TLV, "Neighbor TLV"},
  45     { 0, NULL}
  46 };
  47
  48 void
  49 dtp_print (const u_char *pptr, u_int length)
  50 {
  51     int type, len;
  52     const u_char *tptr;
  53
  54     if (length < DTP_HEADER_LEN)
  55         goto trunc;
  56
  57     tptr = pptr;
  58
  59     if (!TTEST2(*tptr, DTP_HEADER_LEN))
  60         goto trunc;
  61
  62     printf("DTPv%u, length %u",
  63            (*tptr),
  64            length);
  65
  66     /*
  67      * In non-verbose mode, just print version.
  68      */
  69     if (vflag < 1) {
  70         return;
  71     }
  72
  73     tptr += DTP_HEADER_LEN;
  74
  75     while (tptr < (pptr+length)) {
  76
  77         if (!TTEST2(*tptr, 4))
  78             goto trunc;
  79
  80         type = EXTRACT_16BITS(tptr);
  81         len  = EXTRACT_16BITS(tptr+2);
  82
  83         /* infinite loop check */
  84         if (type == 0 || len == 0) {
  85             return;
  86         }
  87
  88         printf("\n\t%s (0x%04x) TLV, length %u",
  89                tok2str(dtp_tlv_values, "Unknown", type),
  90                type, len);
  91
  92         switch (type) {
  93         case DTP_DOMAIN_TLV:
  94                 printf(", %s", tptr+4);
  95                 break;
  96
  97         case DTP_STATUS_TLV:
  98         case DTP_DTP_TYPE_TLV:
  99                 printf(", 0x%x", *(tptr+4));
 100                 break;
 101
 102         case DTP_NEIGHBOR_TLV:
 103                 printf(", %s", etheraddr_string(tptr+4));
 104                 break;
 105
 106         default:
 107             break;
 108         }
 109         tptr += len;
 110     }
 111
 112     return;
 113
 114  trunc:
 115     printf("[|dtp]");
 116 }
 117
 118 /*
 119  * Local Variables:
 120  * c-style: whitesmith
 121  * c-basic-offset: 4
 122  * End:
 123  */