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
33static 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. */
49static const char *op_code_str[] = {
50	"hello",
51	"coup",
52	"resign"
53};
54
55/* HSRP states and associated names. */
56static 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. */
87struct 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
100void
101hsrp_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;
138trunc:
139	printf("[|hsrp]");
140}
141