dist/tcpdump/print-vrrp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 2000 William C. Fenner.
   5  *                All rights reserved.
   6  *
   7  * Kevin Steves <ks@hp.se> July 2000
   8  * Modified to:
   9  * - print version, type string and packet length
  10  * - print IP address count if > 1 (-v)
  11  * - verify checksum (-v)
  12  * - print authentication string (-v)
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that: (1) source code
  16  * distributions retain the above copyright notice and this paragraph
  17  * in its entirety, and (2) distributions including binary code include
  18  * the above copyright notice and this paragraph in its entirety in
  19  * the documentation or other materials provided with the distribution.
  20  * The name of William C. Fenner may not be used to endorse or
  21  * promote products derived from this software without specific prior
  22  * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  23  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  24  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifndef lint
  30 #if 0
  31 static const char rcsid[] _U_ =
  32     "@(#) Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.9.2.1 2005/05/06 07:57:20 guy Exp";
  33 #else
  34 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  35 #endif
  36 #endif
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include "config.h"
  40 #endif
  41
  42 #include <tcpdump-stdinc.h>
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46
  47 #include "interface.h"
  48 #include "extract.h"
  49 #include "addrtoname.h"
  50
  51 /*
  52  * RFC 2338:
  53  *     0                   1                   2                   3
  54  *     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
  55  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  56  *    |Version| Type  | Virtual Rtr ID|   Priority    | Count IP Addrs|
  57  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  58  *    |   Auth Type   |   Adver Int   |          Checksum             |
  59  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  60  *    |                         IP Address (1)                        |
  61  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  62  *    |                            .                                  |
  63  *    |                            .                                  |
  64  *    |                            .                                  |
  65  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  66  *    |                         IP Address (n)                        |
  67  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  68  *    |                     Authentication Data (1)                   |
  69  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  70  *    |                     Authentication Data (2)                   |
  71  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  72  */
  73
  74 /* Type */
  75 #define VRRP_TYPE_ADVERTISEMENT 1
  76
  77 static const struct tok type2str[] = {
  78         { VRRP_TYPE_ADVERTISEMENT,      "Advertisement" },
  79         { 0,                            NULL            }
  80 };
  81
  82 /* Auth Type */
  83 #define VRRP_AUTH_NONE          0
  84 #define VRRP_AUTH_SIMPLE        1
  85 #define VRRP_AUTH_AH            2
  86
  87 static const struct tok auth2str[] = {
  88         { VRRP_AUTH_NONE,               "none"          },
  89         { VRRP_AUTH_SIMPLE,             "simple"        },
  90         { VRRP_AUTH_AH,                 "ah"            },
  91         { 0,                            NULL            }
  92 };
  93
  94 void
  95 vrrp_print(register const u_char *bp, register u_int len, int ttl)
  96 {
  97         int version, type, auth_type;
  98         const char *type_s;
  99
 100         TCHECK(bp[0]);
 101         version = (bp[0] & 0xf0) >> 4;
 102         type = bp[0] & 0x0f;
 103         type_s = tok2str(type2str, "unknown type (%u)", type);
 104         printf("VRRPv%u, %s", version, type_s);
 105         if (ttl != 255)
 106                 printf(", (ttl %u)", ttl);
 107         if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT)
 108                 return;
 109         TCHECK(bp[2]);
 110         printf(", vrid %u, prio %u", bp[1], bp[2]);
 111         TCHECK(bp[5]);
 112         auth_type = bp[4];
 113         printf(", authtype %s", tok2str(auth2str, NULL, auth_type));
 114         printf(", intvl %us, length %u", bp[5],len);
 115         if (vflag) {
 116                 int naddrs = bp[3];
 117                 int i;
 118                 char c;
 119
 120                 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0))
 121                         printf(", (bad vrrp cksum %x)",
 122                                 EXTRACT_16BITS(&bp[6]));
 123                 printf(", addrs");
 124                 if (naddrs > 1)
 125                         printf("(%d)", naddrs);
 126                 printf(":");
 127                 c = ' ';
 128                 bp += 8;
 129                 for (i = 0; i < naddrs; i++) {
 130                         TCHECK(bp[3]);
 131                         printf("%c%s", c, ipaddr_string(bp));
 132                         c = ',';
 133                         bp += 4;
 134                 }
 135                 if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
 136                         TCHECK(bp[7]);
 137                         printf(" auth \"");
 138                         if (fn_printn(bp, 8, snapend)) {
 139                                 printf("\"");
 140                                 goto trunc;
 141                         }
 142                         printf("\"");
 143                 }
 144         }
 145         return;
 146 trunc:
 147         printf("[|vrrp]");
 148 }