text: /*
   * Copyright (C) 2001 Julian Cowley
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the project nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  /* Cisco Hot Standby Router Protocol (HSRP). */
  
  #ifndef lint
  static const char rcsid[] _U_ =
      "@(#) $Header: /tcpdump/master/tcpdump/print-hsrp.c,v 1.10 2005-05-06 07:56:52 guy Exp $";
  #endif
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <tcpdump-stdinc.h>
  
  #include <stdio.h>
  
  #include "interface.h"
  #include "addrtoname.h"
  
  /* HSRP op code types. */
  static const char *op_code_str[] = {
  	"hello",
  	"coup",
  	"resign"
  };
  
  /* HSRP states and associated names. */
  static struct tok states[] = {
  	{  0, "initial" },
  	{  1, "learn" },
  	{  2, "listen" },
  	{  4, "speak" },
  	{  8, "standby" },
  	{ 16, "active" },
  	{  0, NULL }
  };
  
  /*
   * RFC 2281:
   *
   *  0                   1                   2                   3
   *  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
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |   Version     |   Op Code     |     State     |   Hellotime   |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |   Holdtime    |   Priority    |     Group     |   Reserved    |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |                      Authentication  Data                     |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |                      Authentication  Data                     |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |                      Virtual IP Address                       |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   */
  
  #define HSRP_AUTH_SIZE	8
  
  /* HSRP protocol header. */
  struct hsrp {
  	u_int8_t	hsrp_version;
  	u_int8_t	hsrp_op_code;
  	u_int8_t	hsrp_state;
  	u_int8_t	hsrp_hellotime;
  	u_int8_t	hsrp_holdtime;
  	u_int8_t	hsrp_priority;
  	u_int8_t	hsrp_group;
  	u_int8_t	hsrp_reserved;
  	u_int8_t	hsrp_authdata[HSRP_AUTH_SIZE];
  	struct in_addr	hsrp_virtaddr;
  };
  
  void
  hsrp_print(register const u_int8_t *bp, register u_int len)
  {
  	struct hsrp *hp = (struct hsrp *) bp;
  
  	TCHECK(hp->hsrp_version);
  	printf("HSRPv%d", hp->hsrp_version);
  	if (hp->hsrp_version != 0)
  		return;
  	TCHECK(hp->hsrp_op_code);
  	printf("-");
  	printf("%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code));
  	printf("%d: ", len);
  	TCHECK(hp->hsrp_state);
  	printf("state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state));
  	TCHECK(hp->hsrp_group);
  	printf("group=%d ", hp->hsrp_group);
  	TCHECK(hp->hsrp_reserved);
  	if (hp->hsrp_reserved != 0) {
  		printf("[reserved=%d!] ", hp->hsrp_reserved);
  	}
  	TCHECK(hp->hsrp_virtaddr);
  	printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr));
  	if (vflag) {
  		printf(" hellotime=");
  		relts_print(hp->hsrp_hellotime);
  		printf(" holdtime=");
  		relts_print(hp->hsrp_holdtime);
  		printf(" priority=%d", hp->hsrp_priority);
  		printf(" auth=\"");
  		if (fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata),
  		    snapend)) {
  			printf("\"");
  			goto trunc;
  		}
  		printf("\"");
  	}
  	return;
  trunc:
  	printf("[|hsrp]");
  }
  