1 /*
2 * Copyright (c) 2000 William C. Fenner.
3 * All rights reserved.
4 *
5 * Kevin Steves <ks@hp.se> July 2000
6 * Modified to:
7 * - print version, type string and packet length
8 * - print IP address count if > 1 (-v)
9 * - verify checksum (-v)
10 * - print authentication string (-v)
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that: (1) source code
14 * distributions retain the above copyright notice and this paragraph
15 * in its entirety, and (2) distributions including binary code include
16 * the above copyright notice and this paragraph in its entirety in
17 * the documentation or other materials provided with the distribution.
18 * The name of William C. Fenner may not be used to endorse or
19 * promote products derived from this software without specific prior
20 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND
21 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
22 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE.
24 */
25
26 #ifndef lint
27 static const char rcsid[] _U_ =
28 "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.9.2.1 2005/05/06 07:57:20 guy Exp $";
29 #endif
30
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34
35 #include <tcpdump-stdinc.h>
36
37 #include <stdio.h>
38 #include <stdlib.h>
39
40 #include "interface.h"
41 #include "extract.h"
42 #include "addrtoname.h"
43
44 /*
45 * RFC 2338:
46 * 0 1 2 3
47 * 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
48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
49 * |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs|
50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
51 * | Auth Type | Adver Int | Checksum |
52 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
53 * | IP Address (1) |
54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
55 * | . |
56 * | . |
57 * | . |
58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
59 * | IP Address (n) |
60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
61 * | Authentication Data (1) |
62 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
63 * | Authentication Data (2) |
64 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
65 */
66
67 /* Type */
68 #define VRRP_TYPE_ADVERTISEMENT 1
69
70 static const struct tok type2str[] = {
71 { VRRP_TYPE_ADVERTISEMENT, "Advertisement" },
72 { 0, NULL }
73 };
74
75 /* Auth Type */
76 #define VRRP_AUTH_NONE 0
77 #define VRRP_AUTH_SIMPLE 1
78 #define VRRP_AUTH_AH 2
79
80 static const struct tok auth2str[] = {
81 { VRRP_AUTH_NONE, "none" },
82 { VRRP_AUTH_SIMPLE, "simple" },
83 { VRRP_AUTH_AH, "ah" },
84 { 0, NULL }
85 };
86
87 void
vrrp_print(register const u_char * bp,register u_int len,int ttl)88 vrrp_print(register const u_char *bp, register u_int len, int ttl)
89 {
90 int version, type, auth_type;
91 const char *type_s;
92
93 TCHECK(bp[0]);
94 version = (bp[0] & 0xf0) >> 4;
95 type = bp[0] & 0x0f;
96 type_s = tok2str(type2str, "unknown type (%u)", type);
97 printf("VRRPv%u, %s", version, type_s);
98 if (ttl != 255)
99 printf(", (ttl %u)", ttl);
100 if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT)
101 return;
102 TCHECK(bp[2]);
103 printf(", vrid %u, prio %u", bp[1], bp[2]);
104 TCHECK(bp[5]);
105 auth_type = bp[4];
106 printf(", authtype %s", tok2str(auth2str, NULL, auth_type));
107 printf(", intvl %us, length %u", bp[5],len);
108 if (vflag) {
109 int naddrs = bp[3];
110 int i;
111 char c;
112
113 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0))
114 printf(", (bad vrrp cksum %x)",
115 EXTRACT_16BITS(&bp[6]));
116 printf(", addrs");
117 if (naddrs > 1)
118 printf("(%d)", naddrs);
119 printf(":");
120 c = ' ';
121 bp += 8;
122 for (i = 0; i < naddrs; i++) {
123 TCHECK(bp[3]);
124 printf("%c%s", c, ipaddr_string(bp));
125 c = ',';
126 bp += 4;
127 }
128 if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */
129 TCHECK(bp[7]);
130 printf(" auth \"");
131 if (fn_printn(bp, 8, snapend)) {
132 printf("\"");
133 goto trunc;
134 }
135 printf("\"");
136 }
137 }
138 return;
139 trunc:
140 printf("[|vrrp]");
141 }
142