contrib/tcpdump/print-vrrp.c

   1 /*
   2  * Copyright (c) 2000 William C. Fenner.
   3  *                All rights reserved.
   4  *
   5  * Kevin Steves <ks@hp.se> July 2000
   6  * Modified to:
   7  * - print version, type string and packet length
   8  * - print IP address count if > 1 (-v)
   9  * - verify checksum (-v)
  10  * - print authentication string (-v)
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that: (1) source code
  14  * distributions retain the above copyright notice and this paragraph
  15  * in its entirety, and (2) distributions including binary code include
  16  * the above copyright notice and this paragraph in its entirety in
  17  * the documentation or other materials provided with the distribution.
  18  * The name of William C. Fenner may not be used to endorse or
  19  * promote products derived from this software without specific prior
  20  * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  21  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  22  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE.
  24  */
  25
  26 #ifndef lint
  27 static const char rcsid[] _U_ =
  28     "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.10 2005-05-06 07:56:54 guy Exp $";
  29 #endif
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include <tcpdump-stdinc.h>
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39
  40 #include "interface.h"
  41 #include "extract.h"
  42 #include "addrtoname.h"
  43
  44 /*
  45  * RFC 2338:
  46  *     0                   1                   2                   3
  47  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  48  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  49  *    |Version| Type  | Virtual Rtr ID|   Priority    | Count IP Addrs|
  50  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  51  *    |   Auth Type   |   Adver Int   |          Checksum             |
  52  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  53  *    |                         IP Address (1)                        |
  54  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  55  *    |                            .                                  |
  56  *    |                            .                                  |
  57  *    |                            .                                  |
  58  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  59  *    |                         IP Address (n)                        |
  60  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  61  *    |                     Authentication Data (1)                   |
  62  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  63  *    |                     Authentication Data (2)                   |
  64  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  65  */
  66
  67 /* Type */
  68 #define VRRP_TYPE_ADVERTISEMENT 1
  69
  70 static const struct tok type2str[] = {
  71         { VRRP_TYPE_ADVERTISEMENT,      "Advertisement" },
  72         { 0,                            NULL            }
  73 };
  74
  75 /* Auth Type */
  76 #define VRRP_AUTH_NONE          0
  77 #define VRRP_AUTH_SIMPLE        1
  78 #define VRRP_AUTH_AH            2
  79
  80 static const struct tok auth2str[] = {
  81         { VRRP_AUTH_NONE,               "none"          },
  82         { VRRP_AUTH_SIMPLE,             "simple"        },
  83         { VRRP_AUTH_AH,                 "ah"            },
  84         { 0,                            NULL            }
  85 };
  86
  87 void
  88 vrrp_print(register const u_char *bp, register u_int len, int ttl)
  89 {
  90         int version, type, auth_type;
  91         const char *type_s;
  92
  93         TCHECK(bp[0]);
  94         version = (bp[0] & 0xf0) >> 4;
  95         type = bp[0] & 0x0f;
  96         type_s = tok2str(type2str, "unknown type (%u)", type);
  97         printf("VRRPv%u, %s", version, type_s);
  98         if (ttl != 255)
  99                 printf(", (ttl %u)", ttl);
 100         if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT)
 101                 return;
 102         TCHECK(bp[2]);
 103         printf(", vrid %u, prio %u", bp[1], bp[2]);
 104         TCHECK(bp[5]);
 105         auth_type = bp[4];
 106         printf(", authtype %s", tok2str(auth2str, NULL, auth_type));
 107         printf(", intvl %us, length %u", bp[5],len);
 108         if (vflag) {
 109                 int naddrs = bp[3];
 110                 int i;
 111                 char c;
 112
 113                 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0))
 114                         printf(", (bad vrrp cksum %x)",
 115                                 EXTRACT_16BITS(&bp[6]));
 116                 printf(", addrs");
 117                 if (naddrs > 1)
 118                         printf("(%d)", naddrs);
 119                 printf(":");
 120                 c = ' ';
 121                 bp += 8;
 122                 for (i = 0; i < naddrs; i++) {
 123                         TCHECK(bp[3]);
 124                         printf("%c%s", c, ipaddr_string(bp));
 125                         c = ',';
 126                         bp += 4;
 127                 }
 128                 if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
 129                         TCHECK(bp[7]);
 130                         printf(" auth \"");
 131                         if (fn_printn(bp, 8, snapend)) {
 132                                 printf("\"");
 133                                 goto trunc;
 134                         }
 135                         printf("\"");
 136                 }
 137         }
 138         return;
 139 trunc:
 140         printf("[|vrrp]");
 141 }