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      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 const 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 }
    141