1/*	$OpenBSD: print-carp.c,v 1.7 2015/11/15 20:35:36 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
45void
46carp_print(const u_char *bp, u_int len, int ttl)
47{
48	int version, type;
49	char *type_s;
50
51	TCHECK(bp[0]);
52	version = (bp[0] & 0xf0) >> 4;
53	type = bp[0] & 0x0f;
54	if (type == 1)
55		type_s = "advertise";
56	else
57		type_s = "unknown";
58	printf("CARPv%d-%s %d: ", version, type_s, len);
59	if (ttl != 255)
60		printf("[ttl=%d!] ", ttl);
61	if (version != 2 || type != 1)
62		return;
63	TCHECK(bp[2]);
64	TCHECK(bp[5]);
65	printf("vhid=%d advbase=%d advskew=%d demote=%d",
66	    bp[1], bp[5], bp[2], bp[4]);
67	if (vflag) {
68		if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0))
69			printf(" (bad carp cksum %x!)",
70				EXTRACT_16BITS(&bp[6]));
71	}
72	return;
73trunc:
74	printf("[|carp]");
75}
76