1/*	$NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $	*/
2
3/*
4 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that: (1) source code distributions
9 * retain the above copyright notice and this paragraph in its entirety, (2)
10 * distributions including binary code include the above copyright notice and
11 * this paragraph in its entirety in the documentation or other materials
12 * provided with the distribution, and (3) all advertising materials mentioning
13 * features or use of this software display the following acknowledgement:
14 * ``This product includes software developed by the University of California,
15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16 * the University nor the names of its contributors may be used to endorse
17 * or promote products derived from this software without specific prior
18 * written permission.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 */
23
24/* \summary: IPSEC Authentication Header printer */
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <netdissect-stdinc.h>
31
32#include "ah.h"
33
34#include "netdissect.h"
35#include "extract.h"
36
37int
38ah_print(netdissect_options *ndo, register const u_char *bp)
39{
40	register const struct ah *ah;
41	int sumlen;
42
43	ah = (const struct ah *)bp;
44
45	ND_TCHECK(*ah);
46
47	sumlen = ah->ah_len << 2;
48
49	ND_PRINT((ndo, "AH(spi=0x%08x", EXTRACT_32BITS(&ah->ah_spi)));
50	if (ndo->ndo_vflag)
51		ND_PRINT((ndo, ",sumlen=%d", sumlen));
52	ND_TCHECK_32BITS(ah + 1);
53	ND_PRINT((ndo, ",seq=0x%x", EXTRACT_32BITS(ah + 1)));
54	if (!ND_TTEST2(*bp, sizeof(struct ah) + sumlen)) {
55		ND_PRINT((ndo, "[truncated]):"));
56		return -1;
57	}
58	ND_PRINT((ndo, "): "));
59
60	return sizeof(struct ah) + sumlen;
61 trunc:
62	ND_PRINT((ndo, "[|AH]"));
63	return -1;
64}
65