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 1.4 2001-07-20 03:16:23 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
  68 /* Type */
  69 #define VRRP_TYPE_ADVERTISEMENT 1
  70
  71 static const struct tok type2str[] = {
  72         { VRRP_TYPE_ADVERTISEMENT,      "advertisement" },
  73         { 0,                            NULL            }
  74 };
  75
  76 /* Auth Type */
  77 #define VRRP_AUTH_NONE          0
  78 #define VRRP_AUTH_SIMPLE        1
  79 #define VRRP_AUTH_AH            2
  80
  81 static const struct tok auth2str[] = {
  82         { VRRP_AUTH_NONE,               "none"          },
  83         { VRRP_AUTH_SIMPLE,             "simple"        },
  84         { VRRP_AUTH_AH,                 "ah"            },
  85         { 0,                            NULL            }
  86 };
  87
  88 void
  89 vrrp_print(register const u_char *bp, register u_int len, int ttl)
  90 {
  91         int version, type, auth_type;
  92         const char *type_s;
  93
  94         TCHECK(bp[0]);
  95         version = (bp[0] & 0xf0) >> 4;
  96         type = bp[0] & 0x0f;
  97         type_s = tok2str(type2str, "type#%d", type);
  98         printf("VRRPv%d-%s %d: ", version, type_s, len);
  99         if (ttl != 255)
 100                 printf("[ttl=%d!] ", ttl);
 101         if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT)
 102                 return;
 103         TCHECK(bp[2]);
 104         printf("vrid=%d prio=%d", bp[1], bp[2]);
 105         TCHECK(bp[5]);
 106         auth_type = bp[4];
 107         printf(" authtype=%s", tok2str(auth2str, NULL, auth_type));
 108         printf(" intvl=%d", bp[5]);
 109         if (vflag) {
 110                 int naddrs = bp[3];
 111                 int i;
 112                 char c;
 113
 114                 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0))
 115                         printf(" (bad vrrp cksum %x!)",
 116                                 EXTRACT_16BITS(&bp[6]));
 117                 printf(" addrs");
 118                 if (naddrs > 1)
 119                         printf("(%d)", naddrs);
 120                 printf(":");
 121                 c = ' ';
 122                 bp += 8;
 123                 for (i = 0; i < naddrs; i++) {
 124                         TCHECK(bp[3]);
 125                         printf("%c%s", c, ipaddr_string(bp));
 126                         c = ',';
 127                         bp += 4;
 128                 }
 129                 if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
 130                         TCHECK(bp[7]);
 131                         printf(" auth \"");
 132                         fn_printn(bp, bp[7] - bp[0] + 1, NULL);
 133                         printf("\"");
 134                 }
 135         }
 136         return;
 137 trunc:
 138         printf("[|vrrp]");
 139 }