dist/tcpdump/print-hsrp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001 Julian Cowley
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /* Cisco Hot Standby Router Protocol (HSRP). */
  33
  34 #include <sys/cdefs.h>
  35 #ifndef lint
  36 #if 0
  37 static const char rcsid[] _U_ =
  38     "@(#) Header: /tcpdump/master/tcpdump/print-hsrp.c,v 1.9.2.1 2005/05/06 07:57:17 guy Exp";
  39 #else
  40 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  41 #endif
  42 #endif
  43
  44 #ifdef HAVE_CONFIG_H
  45 #include "config.h"
  46 #endif
  47
  48 #include <tcpdump-stdinc.h>
  49
  50 #include <stdio.h>
  51
  52 #include "interface.h"
  53 #include "addrtoname.h"
  54
  55 /* HSRP op code types. */
  56 static const char *op_code_str[] = {
  57         "hello",
  58         "coup",
  59         "resign"
  60 };
  61
  62 /* HSRP states and associated names. */
  63 static struct tok states[] = {
  64         {  0, "initial" },
  65         {  1, "learn" },
  66         {  2, "listen" },
  67         {  4, "speak" },
  68         {  8, "standby" },
  69         { 16, "active" },
  70         {  0, NULL }
  71 };
  72
  73 /*
  74  * RFC 2281:
  75  *
  76  *  0                   1                   2                   3
  77  *  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
  78  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79  * |   Version     |   Op Code     |     State     |   Hellotime   |
  80  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  81  * |   Holdtime    |   Priority    |     Group     |   Reserved    |
  82  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  83  * |                      Authentication  Data                     |
  84  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  85  * |                      Authentication  Data                     |
  86  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  87  * |                      Virtual IP Address                       |
  88  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  89  */
  90
  91 #define HSRP_AUTH_SIZE  8
  92
  93 /* HSRP protocol header. */
  94 struct hsrp {
  95         u_int8_t        hsrp_version;
  96         u_int8_t        hsrp_op_code;
  97         u_int8_t        hsrp_state;
  98         u_int8_t        hsrp_hellotime;
  99         u_int8_t        hsrp_holdtime;
 100         u_int8_t        hsrp_priority;
 101         u_int8_t        hsrp_group;
 102         u_int8_t        hsrp_reserved;
 103         u_int8_t        hsrp_authdata[HSRP_AUTH_SIZE];
 104         struct in_addr  hsrp_virtaddr;
 105 };
 106
 107 void
 108 hsrp_print(register const u_int8_t *bp, register u_int len)
 109 {
 110         struct hsrp *hp = (struct hsrp *) bp;
 111
 112         TCHECK(hp->hsrp_version);
 113         printf("HSRPv%d", hp->hsrp_version);
 114         if (hp->hsrp_version != 0)
 115                 return;
 116         TCHECK(hp->hsrp_op_code);
 117         printf("-");
 118         printf("%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code));
 119         printf("%d: ", len);
 120         TCHECK(hp->hsrp_state);
 121         printf("state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state));
 122         TCHECK(hp->hsrp_group);
 123         printf("group=%d ", hp->hsrp_group);
 124         TCHECK(hp->hsrp_reserved);
 125         if (hp->hsrp_reserved != 0) {
 126                 printf("[reserved=%d!] ", hp->hsrp_reserved);
 127         }
 128         TCHECK(hp->hsrp_virtaddr);
 129         printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr));
 130         if (vflag) {
 131                 printf(" hellotime=");
 132                 relts_print(hp->hsrp_hellotime);
 133                 printf(" holdtime=");
 134                 relts_print(hp->hsrp_holdtime);
 135                 printf(" priority=%d", hp->hsrp_priority);
 136                 printf(" auth=\"");
 137                 if (fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata),
 138                     snapend)) {
 139                         printf("\"");
 140                         goto trunc;
 141                 }
 142                 printf("\"");
 143         }
 144         return;
 145 trunc:
 146         printf("[|hsrp]");
 147 }