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#ifndef lint
19static const char rcsid[] _U_ =
20    "@(#) $Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.7 2005-04-06 21:32:41 mcr Exp $";
21#endif
22
23#ifdef HAVE_CONFIG_H
24#include "config.h"
25#endif
26
27#include <tcpdump-stdinc.h>
28
29#include <stdio.h>
30#include <stdlib.h>
31
32#include "interface.h"
33#include "addrtoname.h"
34#include "extract.h"
35
36#define MSDP_TYPE_MAX	7
37
38void
39msdp_print(const unsigned char *sp, u_int length)
40{
41	unsigned int type, len;
42
43	TCHECK2(*sp, 3);
44	/* See if we think we're at the beginning of a compound packet */
45	type = *sp;
46	len = EXTRACT_16BITS(sp + 1);
47	if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
48		goto trunc;	/* not really truncated, but still not decodable */
49	(void)printf(" msdp:");
50	while (length > 0) {
51		TCHECK2(*sp, 3);
52		type = *sp;
53		len = EXTRACT_16BITS(sp + 1);
54		if (len > 1400 || vflag)
55			printf(" [len %u]", len);
56		if (len < 3)
57			goto trunc;
58		sp += 3;
59		length -= 3;
60		switch (type) {
61		case 1:	/* IPv4 Source-Active */
62		case 3: /* IPv4 Source-Active Response */
63			if (type == 1)
64				(void)printf(" SA");
65			else
66				(void)printf(" SA-Response");
67			TCHECK(*sp);
68			(void)printf(" %u entries", *sp);
69			if ((u_int)((*sp * 12) + 8) < len) {
70				(void)printf(" [w/data]");
71				if (vflag > 1) {
72					(void)printf(" ");
73					ip_print(gndo, sp + *sp * 12 + 8 - 3,
74					         len - (*sp * 12 + 8));
75				}
76			}
77			break;
78		case 2:
79			(void)printf(" SA-Request");
80			TCHECK2(*sp, 5);
81			(void)printf(" for %s", ipaddr_string(sp + 1));
82			break;
83		case 4:
84			(void)printf(" Keepalive");
85			if (len != 3)
86				(void)printf("[len=%d] ", len);
87			break;
88		case 5:
89			(void)printf(" Notification");
90			break;
91		default:
92			(void)printf(" [type=%d len=%d]", type, len);
93			break;
94		}
95		sp += (len - 3);
96		length -= (len - 3);
97	}
98	return;
99trunc:
100	(void)printf(" [|msdp]");
101}
102
103/*
104 * Local Variables:
105 * c-style: whitesmith
106 * c-basic-offset: 8
107 * End:
108 */
109