1/*
2 * Copyright (c) 2001 William C. Fenner.
3 *                All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code
7 * distributions retain the above copyright notice and this paragraph
8 * in its entirety, and (2) distributions including binary code include
9 * the above copyright notice and this paragraph in its entirety in
10 * the documentation or other materials provided with the distribution.
11 * The name of William C. Fenner may not be used to endorse or
12 * promote products derived from this software without specific prior
13 * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
14 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
15 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
16 * FOR A PARTICULAR PURPOSE.
17 */
18#include <sys/cdefs.h>
19#ifndef lint
20#if 0
21static const char rcsid[] _U_ =
22    "@(#) Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.7 2005-04-06 21:32:41 mcr Exp";
23#else
24__RCSID("$NetBSD: print-msdp.c,v 1.2 2010/12/05 05:11:30 christos Exp $");
25#endif
26#endif
27
28#ifdef HAVE_CONFIG_H
29#include "config.h"
30#endif
31
32#include <tcpdump-stdinc.h>
33
34#include <stdio.h>
35#include <stdlib.h>
36
37#include "interface.h"
38#include "addrtoname.h"
39#include "extract.h"
40
41#define MSDP_TYPE_MAX	7
42
43void
44msdp_print(const unsigned char *sp, u_int length)
45{
46	unsigned int type, len;
47
48	TCHECK2(*sp, 3);
49	/* See if we think we're at the beginning of a compound packet */
50	type = *sp;
51	len = EXTRACT_16BITS(sp + 1);
52	if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
53		goto trunc;	/* not really truncated, but still not decodable */
54	(void)printf(" msdp:");
55	while (length > 0) {
56		TCHECK2(*sp, 3);
57		type = *sp;
58		len = EXTRACT_16BITS(sp + 1);
59		if (len > 1400 || vflag)
60			printf(" [len %u]", len);
61		if (len < 3)
62			goto trunc;
63		sp += 3;
64		length -= 3;
65		switch (type) {
66		case 1:	/* IPv4 Source-Active */
67		case 3: /* IPv4 Source-Active Response */
68			if (type == 1)
69				(void)printf(" SA");
70			else
71				(void)printf(" SA-Response");
72			TCHECK(*sp);
73			(void)printf(" %u entries", *sp);
74			if ((u_int)((*sp * 12) + 8) < len) {
75				(void)printf(" [w/data]");
76				if (vflag > 1) {
77					(void)printf(" ");
78					ip_print(gndo, sp + *sp * 12 + 8 - 3,
79					         len - (*sp * 12 + 8));
80				}
81			}
82			break;
83		case 2:
84			(void)printf(" SA-Request");
85			TCHECK2(*sp, 5);
86			(void)printf(" for %s", ipaddr_string(sp + 1));
87			break;
88		case 4:
89			(void)printf(" Keepalive");
90			if (len != 3)
91				(void)printf("[len=%d] ", len);
92			break;
93		case 5:
94			(void)printf(" Notification");
95			break;
96		default:
97			(void)printf(" [type=%d len=%d]", type, len);
98			break;
99		}
100		sp += (len - 3);
101		length -= (len - 3);
102	}
103	return;
104trunc:
105	(void)printf(" [|msdp]");
106}
107
108/*
109 * Local Variables:
110 * c-style: whitesmith
111 * c-basic-offset: 8
112 * End:
113 */
114