external/bsd/tcpdump/dist/print-ah.c

   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 #include <sys/cdefs.h>
  25 #ifndef lint
  26 __RCSID("$NetBSD: print-ah.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  27 #endif
  28
  29 #define NETDISSECT_REWORKED
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include <tcpdump-stdinc.h>
  35
  36 #include "ah.h"
  37
  38 #include "interface.h"
  39 #include "extract.h"
  40
  41 int
  42 ah_print(netdissect_options *ndo, register const u_char *bp)
  43 {
  44         register const struct ah *ah;
  45         register const u_char *ep;
  46         int sumlen;
  47         uint32_t spi;
  48
  49         ah = (const struct ah *)bp;
  50         ep = ndo->ndo_snapend;          /* 'ep' points to the end of available data. */
  51
  52         ND_TCHECK(*ah);
  53
  54         sumlen = ah->ah_len << 2;
  55         spi = EXTRACT_32BITS(&ah->ah_spi);
  56
  57         ND_PRINT((ndo, "AH(spi=0x%08x", spi));
  58         if (ndo->ndo_vflag)
  59                 ND_PRINT((ndo, ",sumlen=%d", sumlen));
  60         ND_PRINT((ndo, ",seq=0x%x", EXTRACT_32BITS(ah + 1)));
  61         if (bp + sizeof(struct ah) + sumlen > ep)
  62                 ND_PRINT((ndo, "[truncated]"));
  63         ND_PRINT((ndo, "): "));
  64
  65         return sizeof(struct ah) + sumlen;
  66  trunc:
  67         ND_PRINT((ndo, "[|AH]"));
  68         return -1;
  69 }