The Tcpdump Group git mirrors - tcpdump/blob - 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 #ifndef lint
  25 static const char rcsid[] =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-ah.c,v 1.12 2000-10-06 04:23:10 guy 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 <netinet/in.h>
  39
  40 #include <stdio.h>
  41
  42 /* there's no standard definition so we are on our own */
  43 struct ah {
  44         u_int8_t        ah_nxt;         /* Next Header */
  45         u_int8_t        ah_len;         /* Length of data, in 32bit */
  46         u_int16_t       ah_reserve;     /* Reserved for future use */
  47         u_int32_t       ah_spi;         /* Security parameter index */
  48         /* variable size, 32bit bound*/ /* Authentication data */
  49 };
  50
  51 struct newah {
  52         u_int8_t        ah_nxt;         /* Next Header */
  53         u_int8_t        ah_len;         /* Length of data + 1, in 32bit */
  54         u_int16_t       ah_reserve;     /* Reserved for future use */
  55         u_int32_t       ah_spi;         /* Security parameter index */
  56         u_int32_t       ah_seq;         /* Sequence number field */
  57         /* variable size, 32bit bound*/ /* Authentication data */
  58 };
  59
  60 #include "interface.h"
  61 #include "addrtoname.h"
  62
  63 int
  64 ah_print(register const u_char *bp, register const u_char *bp2)
  65 {
  66         register const struct ah *ah;
  67         register const u_char *ep;
  68         int sumlen;
  69         u_int32_t spi;
  70
  71         ah = (struct ah *)bp;
  72         ep = snapend;           /* 'ep' points to the end of available data. */
  73
  74         if ((u_char *)(ah + 1) >= ep - sizeof(struct ah))
  75                 goto trunc;
  76
  77         sumlen = ah->ah_len << 2;
  78         spi = (u_int32_t)ntohl(ah->ah_spi);
  79
  80         printf("AH(spi=%u", spi);
  81         if (vflag)
  82                 printf(",sumlen=%d", sumlen);
  83         printf(",seq=0x%x", (u_int32_t)ntohl(*(u_int32_t *)(ah + 1)));
  84         if (bp + sizeof(struct ah) + sumlen > ep)
  85                 fputs("[truncated]", stdout);
  86         fputs("): ", stdout);
  87
  88         return sizeof(struct ah) + sumlen;
  89  trunc:
  90         fputs("[|AH]", stdout);
  91         return 65535;
  92 }