1 /* $OpenBSD: print-hsrp.c,v 1.5 2015/11/16 00:16:39 mmcc Exp $ */
2
3 /*
4 * Copyright (C) 2001 Julian Cowley
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /* Cisco Hot Standby Router Protocol (HSRP). */
33
34 #ifdef HAVE_CONFIG_H
35 #include "config.h"
36 #endif
37
38 #include <sys/types.h>
39
40 #include <stdio.h>
41 #include <netinet/in.h>
42
43 #include "interface.h"
44 #include "addrtoname.h"
45
46 /* HSRP op code types. */
47 static const char *op_code_str[] = {
48 "hello",
49 "coup",
50 "resign"
51 };
52
53 /* HSRP states and associated names. */
54 static struct tok states[] = {
55 { 0, "initial" },
56 { 1, "learn" },
57 { 2, "listen" },
58 { 4, "speak" },
59 { 8, "standby" },
60 { 16, "active" },
61 { 0, NULL }
62 };
63
64 /*
65 * RFC 2281:
66 *
67 * 0 1 2 3
68 * 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
69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
70 * | Version | Op Code | State | Hellotime |
71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72 * | Holdtime | Priority | Group | Reserved |
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 * | Authentication Data |
75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
76 * | Authentication Data |
77 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
78 * | Virtual IP Address |
79 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
80 */
81
82 #define HSRP_AUTH_SIZE 8
83
84 /* HSRP protocol header. */
85 struct hsrp {
86 u_char hsrp_version;
87 u_char hsrp_op_code;
88 u_char hsrp_state;
89 u_char hsrp_hellotime;
90 u_char hsrp_holdtime;
91 u_char hsrp_priority;
92 u_char hsrp_group;
93 u_char hsrp_reserved;
94 u_char hsrp_authdata[HSRP_AUTH_SIZE];
95 struct in_addr hsrp_virtaddr;
96 };
97
98 void
hsrp_print(const u_char * bp,u_int len)99 hsrp_print(const u_char *bp, u_int len)
100 {
101 struct hsrp *hp = (struct hsrp *) bp;
102
103 TCHECK(hp->hsrp_version);
104 printf("HSRPv%d", hp->hsrp_version);
105 if (hp->hsrp_version != 0)
106 return;
107 TCHECK(hp->hsrp_op_code);
108 printf("-");
109 if (hp->hsrp_op_code >= sizeof(op_code_str)/sizeof(*op_code_str))
110 printf("unknown (%d) ", hp->hsrp_op_code);
111 else
112 printf("%s ", op_code_str[hp->hsrp_op_code]);
113 printf("%d: ", len);
114 TCHECK(hp->hsrp_state);
115 printf("state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state));
116 TCHECK(hp->hsrp_group);
117 printf("group=%d ", hp->hsrp_group);
118 TCHECK(hp->hsrp_reserved);
119 if (hp->hsrp_reserved != 0) {
120 printf("[reserved=%d!] ", hp->hsrp_reserved);
121 }
122 TCHECK2(hp->hsrp_virtaddr, sizeof(hp->hsrp_virtaddr));
123 printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr));
124 if (vflag) {
125 printf(" hellotime=");
126 relts_print(hp->hsrp_hellotime);
127 printf(" holdtime=");
128 relts_print(hp->hsrp_holdtime);
129 printf(" priority=%d", hp->hsrp_priority);
130 printf(" auth=\"");
131 fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata), NULL);
132 printf("\"");
133 }
134 return;
135 trunc:
136 printf("[|hsrp]");
137 }
138