print-ah.c revision 56893 
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#ifndef lint
25static const char rcsid[] =
26    "@(#) $Header: /tcpdump/master/tcpdump/print-ah.c,v 1.5 1999/12/15 08:10:17 fenner Exp $ (LBL)";
27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#include <sys/param.h>
34#include <sys/time.h>
35#include <sys/types.h>
36#include <sys/socket.h>
37
38#include <net/route.h>
39#include <net/if.h>
40
41#include <netinet/in.h>
42#include <netinet/if_ether.h>
43#include <netinet/in_systm.h>
44#include <netinet/ip.h>
45#include <netinet/ip_icmp.h>
46#include <netinet/ip_var.h>
47#include <netinet/udp.h>
48#include <netinet/udp_var.h>
49#include <netinet/tcp.h>
50
51#include <stdio.h>
52
53/* there's no standard definition so we are on our own */
54struct ah {
55	u_int8_t	ah_nxt;		/* Next Header */
56	u_int8_t	ah_len;		/* Length of data, in 32bit */
57	u_int16_t	ah_reserve;	/* Reserved for future use */
58	u_int32_t	ah_spi;		/* Security parameter index */
59	/* variable size, 32bit bound*/	/* Authentication data */
60};
61
62struct newah {
63	u_int8_t	ah_nxt;		/* Next Header */
64	u_int8_t	ah_len;		/* Length of data + 1, in 32bit */
65	u_int16_t	ah_reserve;	/* Reserved for future use */
66	u_int32_t	ah_spi;		/* Security parameter index */
67	u_int32_t	ah_seq;		/* Sequence number field */
68	/* variable size, 32bit bound*/	/* Authentication data */
69};
70
71#include "interface.h"
72#include "addrtoname.h"
73
74int
75ah_print(register const u_char *bp, register const u_char *bp2)
76{
77	register const struct ah *ah;
78	register const u_char *ep;
79	int sumlen;
80	u_int32_t spi;
81
82	ah = (struct ah *)bp;
83	ep = snapend;		/* 'ep' points to the end of avaible data. */
84
85	if ((u_char *)(ah + 1) >= ep - sizeof(struct ah))
86		goto trunc;
87
88	sumlen = ah->ah_len << 2;
89	spi = (u_int32_t)ntohl(ah->ah_spi);
90
91	printf("AH(spi=%u", spi);
92	if (vflag)
93		printf(",sumlen=%d", sumlen);
94	printf(",seq=0x%x", (u_int32_t)ntohl(*(u_int32_t *)(ah + 1)));
95	if (bp + sizeof(struct ah) + sumlen > ep)
96		fputs("[truncated]", stdout);
97	fputs("): ", stdout);
98
99	return sizeof(struct ah) + sumlen;
100 trunc:
101	fputs("[|AH]", stdout);
102	return 65535;
103}
104