The Tcpdump Group git mirrors - tcpdump/blob - 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[] =
  28     "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.3 2000-10-10 05:05:08 guy Exp $";
  29 #endif
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <unistd.h>
  38
  39 #include <netinet/in.h>
  40
  41 #include "interface.h"
  42 #include "extract.h"
  43 #include "addrtoname.h"
  44
  45 /*
  46  * RFC 2338:
  47  *     0                   1                   2                   3
  48  *     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
  49  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  50  *    |Version| Type  | Virtual Rtr ID|   Priority    | Count IP Addrs|
  51  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  52  *    |   Auth Type   |   Adver Int   |          Checksum             |
  53  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  54  *    |                         IP Address (1)                        |
  55  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  56  *    |                            .                                  |
  57  *    |                            .                                  |
  58  *    |                            .                                  |
  59  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  60  *    |                         IP Address (n)                        |
  61  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  62  *    |                     Authentication Data (1)                   |
  63  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  64  *    |                     Authentication Data (2)                   |
  65  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  66  */
  67 void
  68 vrrp_print(register const u_char *bp, register u_int len, int ttl)
  69 {
  70         int version, type, auth_type;
  71         char *type_s;
  72
  73         TCHECK(bp[0]);
  74         version = (bp[0] & 0xf0) >> 4;
  75         type = bp[0] & 0x0f;
  76         if (type == 1)
  77                 type_s = "advertise";
  78         else
  79                 type_s = "unknown";
  80         printf("VRRPv%d-%s %d: ", version, type_s, len);
  81         if (ttl != 255)
  82                 printf("[ttl=%d!] ", ttl);
  83         if (version != 2 || type != 1)
  84                 return;
  85         TCHECK(bp[2]);
  86         printf("vrid=%d prio=%d", bp[1], bp[2]);
  87         TCHECK(bp[5]);
  88         auth_type = bp[4];
  89         if (auth_type != 0)
  90                 printf(" authtype=%d", auth_type);
  91         printf(" intvl=%d", bp[5]);
  92         if (vflag) {
  93                 int naddrs = bp[3];
  94                 int i;
  95                 char c;
  96
  97                 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0))
  98                         printf(" (bad vrrp cksum %x!)",
  99                                 EXTRACT_16BITS(&bp[6]));
 100                 printf(" addrs");
 101                 if (naddrs > 1)
 102                         printf("(%d)", naddrs);
 103                 printf(":");
 104                 c = ' ';
 105                 bp += 8;
 106                 for (i = 0; i < naddrs; i++) {
 107                         TCHECK(bp[3]);
 108                         printf("%c%s", c, ipaddr_string(bp));
 109                         c = ',';
 110                         bp += 4;
 111                 }
 112                 if (auth_type == 1) { /* simple text password */
 113                         TCHECK(bp[7]);
 114                         printf(" auth %.8s", bp);
 115                 }
 116         }
 117         return;
 118 trunc:
 119         printf("[|vrrp]");
 120 }