The Tcpdump Group git mirrors - tcpdump/blob - 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[] =
  34     "@(#) $Header: /tcpdump/master/tcpdump/print-hsrp.c,v 1.1 2001-09-17 06:22:33 guy Exp $";
  35 #endif
  36
  37 #ifdef HAVE_CONFIG_H
  38 #include "config.h"
  39 #endif
  40
  41 #include <sys/types.h>
  42
  43 #include <stdio.h>
  44 #include <netinet/in.h>
  45
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48
  49 /* HSRP op code types. */
  50 static char *op_code_str[] = {
  51         "hello",
  52         "coup",
  53         "resign"
  54 };
  55
  56 /* HSRP states and associated names. */
  57 static struct {
  58         u_int value;
  59         char *str;
  60 } states[] = {
  61         {  0, "initial" },
  62         {  1, "learn" },
  63         {  2, "listen" },
  64         {  4, "speak" },
  65         {  8, "standby" },
  66         { 16, "active" }
  67 };
  68
  69 /*
  70  * RFC 2281:
  71  *
  72  *  0                   1                   2                   3
  73  *  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
  74  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  75  * |   Version     |   Op Code     |     State     |   Hellotime   |
  76  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  77  * |   Holdtime    |   Priority    |     Group     |   Reserved    |
  78  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79  * |                      Authentication  Data                     |
  80  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  81  * |                      Authentication  Data                     |
  82  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  83  * |                      Virtual IP Address                       |
  84  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  85  */
  86
  87 #define HSRP_AUTH_SIZE  8
  88
  89 /* HSRP protocol header. */
  90 struct hsrp {
  91         u_char          hsrp_version;
  92         u_char          hsrp_op_code;
  93         u_char          hsrp_state;
  94         u_char          hsrp_hellotime;
  95         u_char          hsrp_holdtime;
  96         u_char          hsrp_priority;
  97         u_char          hsrp_group;
  98         u_char          hsrp_reserved;
  99         u_char          hsrp_authdata[HSRP_AUTH_SIZE];
 100         struct in_addr  hsrp_virtaddr;
 101 };
 102
 103 void
 104 hsrp_print(register const u_char *bp, register u_int len)
 105 {
 106         int op_code, state;
 107         struct hsrp *hp = (struct hsrp *) bp;
 108         int i;
 109
 110         TCHECK(hp->hsrp_version);
 111         printf("HSRPv%d", hp->hsrp_version);
 112         if (hp->hsrp_version != 0)
 113                 return;
 114         TCHECK(hp->hsrp_op_code);
 115         printf("-");
 116         op_code = hp->hsrp_op_code;
 117         if (op_code < (sizeof(op_code_str) / sizeof(op_code_str[0]))) {
 118                 printf("%s ", op_code_str[op_code]);
 119         } else {
 120                 printf("unknown (%d) ", op_code);
 121         }
 122         printf("%d: ", len);
 123         TCHECK(hp->hsrp_state);
 124         state = hp->hsrp_state;
 125         for (i = 0; i < (sizeof(states) / sizeof(states[0])); i++) {
 126                 if (state == states[i].value)
 127                         break;
 128         }
 129         if (i < (sizeof(states) / sizeof(states[0]))) {
 130                 printf("state=%s ", states[i].str);
 131         } else {
 132                 printf("state=Unknown (%d) ", state);
 133         }
 134         TCHECK(hp->hsrp_group);
 135         printf("group=%d ", hp->hsrp_group);
 136         TCHECK(hp->hsrp_reserved);
 137         if (hp->hsrp_reserved != 0) {
 138                 printf("[reserved=%d!] ", hp->hsrp_reserved);
 139         }
 140         TCHECK2(hp->hsrp_virtaddr, sizeof(hp->hsrp_virtaddr));
 141         printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr));
 142         if (vflag) {
 143                 printf(" hellotime=");
 144                 relts_print(hp->hsrp_hellotime);
 145                 printf(" holdtime=");
 146                 relts_print(hp->hsrp_holdtime);
 147                 printf(" priority=%d", hp->hsrp_priority);
 148                 printf(" auth=\"");
 149                 fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata), NULL);
 150                 printf("\"");
 151         }
 152         return;
 153 trunc:
 154         printf("[|hsrp]");
 155 }