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1 office 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  
36 int
37 ah_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 }