contrib/tcpdump/print-hsrp.c

   1 /*
   2  * Copyright (C) 2001 Julian Cowley
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /* Cisco Hot Standby Router Protocol (HSRP). */
  31
  32 #ifndef lint
  33 static const char rcsid[] _U_ =
  34     "@(#) $Header: /tcpdump/master/tcpdump/print-hsrp.c,v 1.10 2005-05-06 07:56:52 guy Exp $";
  35 #endif
  36
  37 #ifdef HAVE_CONFIG_H
  38 #include "config.h"
  39 #endif
  40
  41 #include <tcpdump-stdinc.h>
  42
  43 #include <stdio.h>
  44
  45 #include "interface.h"
  46 #include "addrtoname.h"
  47
  48 /* HSRP op code types. */
  49 static const char *op_code_str[] = {
  50         "hello",
  51         "coup",
  52         "resign"
  53 };
  54
  55 /* HSRP states and associated names. */
  56 static struct tok states[] = {
  57         {  0, "initial" },
  58         {  1, "learn" },
  59         {  2, "listen" },
  60         {  4, "speak" },
  61         {  8, "standby" },
  62         { 16, "active" },
  63         {  0, NULL }
  64 };
  65
  66 /*
  67  * RFC 2281:
  68  *
  69  *  0                   1                   2                   3
  70  *  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
  71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  72  * |   Version     |   Op Code     |     State     |   Hellotime   |
  73  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  74  * |   Holdtime    |   Priority    |     Group     |   Reserved    |
  75  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  76  * |                      Authentication  Data                     |
  77  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  78  * |                      Authentication  Data                     |
  79  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  80  * |                      Virtual IP Address                       |
  81  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  82  */
  83
  84 #define HSRP_AUTH_SIZE  8
  85
  86 /* HSRP protocol header. */
  87 struct hsrp {
  88         u_int8_t        hsrp_version;
  89         u_int8_t        hsrp_op_code;
  90         u_int8_t        hsrp_state;
  91         u_int8_t        hsrp_hellotime;
  92         u_int8_t        hsrp_holdtime;
  93         u_int8_t        hsrp_priority;
  94         u_int8_t        hsrp_group;
  95         u_int8_t        hsrp_reserved;
  96         u_int8_t        hsrp_authdata[HSRP_AUTH_SIZE];
  97         struct in_addr  hsrp_virtaddr;
  98 };
  99
 100 void
 101 hsrp_print(register const u_int8_t *bp, register u_int len)
 102 {
 103         struct hsrp *hp = (struct hsrp *) bp;
 104
 105         TCHECK(hp->hsrp_version);
 106         printf("HSRPv%d", hp->hsrp_version);
 107         if (hp->hsrp_version != 0)
 108                 return;
 109         TCHECK(hp->hsrp_op_code);
 110         printf("-");
 111         printf("%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code));
 112         printf("%d: ", len);
 113         TCHECK(hp->hsrp_state);
 114         printf("state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state));
 115         TCHECK(hp->hsrp_group);
 116         printf("group=%d ", hp->hsrp_group);
 117         TCHECK(hp->hsrp_reserved);
 118         if (hp->hsrp_reserved != 0) {
 119                 printf("[reserved=%d!] ", hp->hsrp_reserved);
 120         }
 121         TCHECK(hp->hsrp_virtaddr);
 122         printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr));
 123         if (vflag) {
 124                 printf(" hellotime=");
 125                 relts_print(hp->hsrp_hellotime);
 126                 printf(" holdtime=");
 127                 relts_print(hp->hsrp_holdtime);
 128                 printf(" priority=%d", hp->hsrp_priority);
 129                 printf(" auth=\"");
 130                 if (fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata),
 131                     snapend)) {
 132                         printf("\"");
 133                         goto trunc;
 134                 }
 135                 printf("\"");
 136         }
 137         return;
 138 trunc:
 139         printf("[|hsrp]");
 140 }