2 * Copyright (C) 2001 Julian Cowley
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
30 /* \summary: Cisco Hot Standby Router Protocol (HSRP) printer */
32 /* specification: RFC 2281 for version 1 */
38 #include "netdissect-stdinc.h"
40 #include "netdissect.h"
41 #include "addrtoname.h"
44 /* HSRP op code types. */
45 static const char *op_code_str[] = {
51 /* HSRP states and associated names. */
52 static const struct tok states[] = {
66 * 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
67 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
68 * | Version | Op Code | State | Hellotime |
69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
70 * | Holdtime | Priority | Group | Reserved |
71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72 * | Authentication Data |
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 * | Authentication Data |
75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
76 * | Virtual IP Address |
77 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
80 #define HSRP_AUTH_SIZE 8
82 /* HSRP protocol header. */
84 nd_uint8_t hsrp_version;
85 nd_uint8_t hsrp_op_code;
86 nd_uint8_t hsrp_state;
87 nd_uint8_t hsrp_hellotime;
88 nd_uint8_t hsrp_holdtime;
89 nd_uint8_t hsrp_priority;
90 nd_uint8_t hsrp_group;
91 nd_uint8_t hsrp_reserved;
92 nd_byte hsrp_authdata[HSRP_AUTH_SIZE];
93 nd_ipv4 hsrp_virtaddr;
97 hsrp_print(netdissect_options *ndo, const u_char *bp, u_int len)
99 const struct hsrp *hp = (const struct hsrp *) bp;
102 ndo->ndo_protocol = "hsrp";
103 version = GET_U_1(hp->hsrp_version);
104 ND_PRINT("HSRPv%u", version);
109 tok2strary(op_code_str, "unknown (%u)", GET_U_1(hp->hsrp_op_code)));
110 ND_PRINT("%u: ", len);
111 ND_PRINT("state=%s ",
112 tok2str(states, "Unknown (%u)", GET_U_1(hp->hsrp_state)));
113 ND_PRINT("group=%u ", GET_U_1(hp->hsrp_group));
114 if (GET_U_1(hp->hsrp_reserved) != 0) {
115 ND_PRINT("[reserved=%u!] ", GET_U_1(hp->hsrp_reserved));
117 ND_PRINT("addr=%s", GET_IPADDR_STRING(hp->hsrp_virtaddr));
118 if (ndo->ndo_vflag) {
119 ND_PRINT(" hellotime=");
120 unsigned_relts_print(ndo, GET_U_1(hp->hsrp_hellotime));
121 ND_PRINT(" holdtime=");
122 unsigned_relts_print(ndo, GET_U_1(hp->hsrp_holdtime));
123 ND_PRINT(" priority=%u", GET_U_1(hp->hsrp_priority));
124 ND_PRINT(" auth=\"");
126 * RFC 2281 Section 5.1 does not specify the encoding of
127 * Authentication Data explicitly, but zero padding can be
128 * inferred from the "recommended default value".
130 nd_printjnp(ndo, hp->hsrp_authdata, HSRP_AUTH_SIZE);