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 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <tcpdump-stdinc.h>
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34
  35 #include "interface.h"
  36 #include "extract.h"
  37 #include "addrtoname.h"
  38
  39 /*
  40  * RFC 2338:
  41  *     0                   1                   2                   3
  42  *     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
  43  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  44  *    |Version| Type  | Virtual Rtr ID|   Priority    | Count IP Addrs|
  45  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  46  *    |   Auth Type   |   Adver Int   |          Checksum             |
  47  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  48  *    |                         IP Address (1)                        |
  49  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  50  *    |                            .                                  |
  51  *    |                            .                                  |
  52  *    |                            .                                  |
  53  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  54  *    |                         IP Address (n)                        |
  55  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  56  *    |                     Authentication Data (1)                   |
  57  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  58  *    |                     Authentication Data (2)                   |
  59  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  60  */
  61
  62 /* Type */
  63 #define VRRP_TYPE_ADVERTISEMENT 1
  64
  65 static const struct tok type2str[] = {
  66         { VRRP_TYPE_ADVERTISEMENT,      "Advertisement" },
  67         { 0,                            NULL            }
  68 };
  69
  70 /* Auth Type */
  71 #define VRRP_AUTH_NONE          0
  72 #define VRRP_AUTH_SIMPLE        1
  73 #define VRRP_AUTH_AH            2
  74
  75 static const struct tok auth2str[] = {
  76         { VRRP_AUTH_NONE,               "none"          },
  77         { VRRP_AUTH_SIMPLE,             "simple"        },
  78         { VRRP_AUTH_AH,                 "ah"            },
  79         { 0,                            NULL            }
  80 };
  81
  82 void
  83 vrrp_print(register const u_char *bp, register u_int len, int ttl)
  84 {
  85         int version, type, auth_type;
  86         const char *type_s;
  87
  88         TCHECK(bp[0]);
  89         version = (bp[0] & 0xf0) >> 4;
  90         type = bp[0] & 0x0f;
  91         type_s = tok2str(type2str, "unknown type (%u)", type);
  92         printf("VRRPv%u, %s", version, type_s);
  93         if (ttl != 255)
  94                 printf(", (ttl %u)", ttl);
  95         if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT)
  96                 return;
  97         TCHECK(bp[2]);
  98         printf(", vrid %u, prio %u", bp[1], bp[2]);
  99         TCHECK(bp[5]);
 100         auth_type = bp[4];
 101         printf(", authtype %s", tok2str(auth2str, NULL, auth_type));
 102         printf(", intvl %us, length %u", bp[5],len);
 103         if (vflag) {
 104                 int naddrs = bp[3];
 105                 int i;
 106                 char c;
 107
 108                 if (TTEST2(bp[0], len)) {
 109                         struct cksum_vec vec[1];
 110
 111                         vec[0].ptr = bp;
 112                         vec[0].len = len;
 113                         if (in_cksum(vec, 1))
 114                                 printf(", (bad vrrp cksum %x)",
 115                                         EXTRACT_16BITS(&bp[6]));
 116                 }
 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                         if (fn_printn(bp, 8, snapend)) {
 133                                 printf("\"");
 134                                 goto trunc;
 135                         }
 136                         printf("\"");
 137                 }
 138         }
 139         return;
 140 trunc:
 141         printf("[|vrrp]");
 142 }