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#define NETDISSECT_REWORKED
25#ifdef HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <tcpdump-stdinc.h>
30
31#include "ah.h"
32
33#include "interface.h"
34#include "extract.h"
35
36int
37ah_print(netdissect_options *ndo, register const u_char *bp)
38{
39	register const struct ah *ah;
40	register const u_char *ep;
41	int sumlen;
42	uint32_t spi;
43
44	ah = (const struct ah *)bp;
45	ep = ndo->ndo_snapend;		/* 'ep' points to the end of available data. */
46
47	ND_TCHECK(*ah);
48
49	sumlen = ah->ah_len << 2;
50	spi = EXTRACT_32BITS(&ah->ah_spi);
51
52	ND_PRINT((ndo, "AH(spi=0x%08x", spi));
53	if (ndo->ndo_vflag)
54		ND_PRINT((ndo, ",sumlen=%d", sumlen));
55	ND_PRINT((ndo, ",seq=0x%x", EXTRACT_32BITS(ah + 1)));
56	if (bp + sizeof(struct ah) + sumlen > ep)
57		ND_PRINT((ndo, "[truncated]"));
58	ND_PRINT((ndo, "): "));
59
60	return sizeof(struct ah) + sumlen;
61 trunc:
62	ND_PRINT((ndo, "[|AH]"));
63	return -1;
64}
65