1 /* $OpenBSD: print-vrrp.c,v 1.4 2015/11/16 00:16:39 mmcc Exp $ */
2
3 /*
4 * Copyright (c) 2000 William C. Fenner.
5 * All rights reserved.
6 *
7 * Kevin Steves <ks@hp.se> July 2000
8 * Modified to:
9 * - print version, type string and packet length
10 * - print IP address count if > 1 (-v)
11 * - verify checksum (-v)
12 * - print authentication string (-v)
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that: (1) source code
16 * distributions retain the above copyright notice and this paragraph
17 * in its entirety, and (2) distributions including binary code include
18 * the above copyright notice and this paragraph in its entirety in
19 * the documentation or other materials provided with the distribution.
20 * The name of William C. Fenner may not be used to endorse or
21 * promote products derived from this software without specific prior
22 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND
23 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
24 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE.
26 *
27 * from tcpdump.org:
28 * Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.3 2000/10/10 05:05:08 guy Exp
29 */
30
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38
39 #include <netinet/in.h>
40
41 #include "interface.h"
42 #include "extract.h"
43 #include "addrtoname.h"
44
45 /*
46 * RFC 2338:
47 * 0 1 2 3
48 * 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
49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
50 * |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs|
51 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
52 * | Auth Type | Adver Int | Checksum |
53 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
54 * | IP Address (1) |
55 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
56 * | . |
57 * | . |
58 * | . |
59 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
60 * | IP Address (n) |
61 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
62 * | Authentication Data (1) |
63 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
64 * | Authentication Data (2) |
65 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
66 */
67 void
vrrp_print(const u_char * bp,u_int len,int ttl)68 vrrp_print(const u_char *bp, u_int len, int ttl)
69 {
70 int version, type, auth_type;
71 char *type_s;
72
73 TCHECK(bp[0]);
74 version = (bp[0] & 0xf0) >> 4;
75 type = bp[0] & 0x0f;
76 if (type == 1)
77 type_s = "advertise";
78 else
79 type_s = "unknown";
80 printf("VRRPv%d-%s %d: ", version, type_s, len);
81 if (ttl != 255)
82 printf("[ttl=%d!] ", ttl);
83 if (version != 2 || type != 1)
84 return;
85 TCHECK(bp[2]);
86 printf("vrid=%d prio=%d", bp[1], bp[2]);
87 TCHECK(bp[5]);
88 auth_type = bp[4];
89 if (auth_type != 0)
90 printf(" authtype=%d", auth_type);
91 printf(" intvl=%d", bp[5]);
92 if (vflag) {
93 int naddrs = bp[3];
94 int i;
95 char c;
96
97 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0))
98 printf(" (bad vrrp cksum %x!)",
99 EXTRACT_16BITS(&bp[6]));
100 printf(" addrs");
101 if (naddrs > 1)
102 printf("(%d)", naddrs);
103 printf(":");
104 c = ' ';
105 bp += 8;
106 for (i = 0; i < naddrs; i++) {
107 TCHECK(bp[3]);
108 printf("%c%s", c, ipaddr_string(bp));
109 c = ',';
110 bp += 4;
111 }
112 if (auth_type == 1) { /* simple text password */
113 TCHECK(bp[7]);
114 printf(" auth %.8s", bp);
115 }
116 }
117 return;
118 trunc:
119 printf("[|vrrp]");
120 }
121