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
19/* \summary: Multicast Source Discovery Protocol (MSDP) printer */
20
21#ifdef HAVE_CONFIG_H
22#include "config.h"
23#endif
24
25#include <netdissect-stdinc.h>
26
27#include "netdissect.h"
28#include "addrtoname.h"
29#include "extract.h"
30
31#define MSDP_TYPE_MAX	7
32
33void
34msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)
35{
36	unsigned int type, len;
37
38	ND_TCHECK2(*sp, 3);
39	/* See if we think we're at the beginning of a compound packet */
40	type = *sp;
41	len = EXTRACT_16BITS(sp + 1);
42	if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
43		goto trunc;	/* not really truncated, but still not decodable */
44	ND_PRINT((ndo, " msdp:"));
45	while (length > 0) {
46		ND_TCHECK2(*sp, 3);
47		type = *sp;
48		len = EXTRACT_16BITS(sp + 1);
49		if (len > 1400 || ndo->ndo_vflag)
50			ND_PRINT((ndo, " [len %u]", len));
51		if (len < 3)
52			goto trunc;
53		sp += 3;
54		length -= 3;
55		switch (type) {
56		case 1:	/* IPv4 Source-Active */
57		case 3: /* IPv4 Source-Active Response */
58			if (type == 1)
59				ND_PRINT((ndo, " SA"));
60			else
61				ND_PRINT((ndo, " SA-Response"));
62			ND_TCHECK(*sp);
63			ND_PRINT((ndo, " %u entries", *sp));
64			if ((u_int)((*sp * 12) + 8) < len) {
65				ND_PRINT((ndo, " [w/data]"));
66				if (ndo->ndo_vflag > 1) {
67					ND_PRINT((ndo, " "));
68					ip_print(ndo, sp + *sp * 12 + 8 - 3,
69					         len - (*sp * 12 + 8));
70				}
71			}
72			break;
73		case 2:
74			ND_PRINT((ndo, " SA-Request"));
75			ND_TCHECK2(*sp, 5);
76			ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1)));
77			break;
78		case 4:
79			ND_PRINT((ndo, " Keepalive"));
80			if (len != 3)
81				ND_PRINT((ndo, "[len=%d] ", len));
82			break;
83		case 5:
84			ND_PRINT((ndo, " Notification"));
85			break;
86		default:
87			ND_PRINT((ndo, " [type=%d len=%d]", type, len));
88			break;
89		}
90		sp += (len - 3);
91		length -= (len - 3);
92	}
93	return;
94trunc:
95	ND_PRINT((ndo, " [|msdp]"));
96}
97
98/*
99 * Local Variables:
100 * c-style: whitesmith
101 * c-basic-offset: 8
102 * End:
103 */
104