dist/tcpdump/print-ipcomp.c

   1 /*      $NetBSD: print-ipcomp.c,v 1.4 2007/07/24 11:53:44 drochner Exp $        */
   2
   3 /*
   4  * Copyright (c) 1988, 1989, 1990, 1991, 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 #if 0
  27 static const char rcsid[] _U_ =
  28     "@(#) Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.20 2003/11/19 00:36:08 guy Exp";
  29 #else
  30 __RCSID("$NetBSD: print-ipcomp.c,v 1.4 2007/07/24 11:53:44 drochner Exp $");
  31 #endif
  32 #endif
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 #endif
  37
  38 #include <string.h>
  39 #include <tcpdump-stdinc.h>
  40
  41 #include <stdio.h>
  42
  43 struct ipcomp {
  44         u_int8_t comp_nxt;      /* Next Header */
  45         u_int8_t comp_flags;    /* Length of data, in 32bit */
  46         u_int16_t comp_cpi;     /* Compression parameter index */
  47 };
  48
  49 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  50 #include <zlib.h>
  51 #endif
  52
  53 #include "interface.h"
  54 #include "addrtoname.h"
  55 #include "extract.h"
  56
  57 int
  58 ipcomp_print(register const u_char *bp, int *nhdr _U_)
  59 {
  60         register const struct ipcomp *ipcomp;
  61         register const u_char *ep;
  62         u_int16_t cpi;
  63 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  64         int advance;
  65 #endif
  66
  67         ipcomp = (struct ipcomp *)bp;
  68         cpi = EXTRACT_16BITS(&ipcomp->comp_cpi);
  69
  70         /* 'ep' points to the end of available data. */
  71         ep = snapend;
  72
  73         if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
  74                 fputs("[|IPCOMP]", stdout);
  75                 goto fail;
  76         }
  77         printf("IPComp(cpi=0x%04x)", cpi);
  78
  79 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  80         if (1)
  81                 goto fail;
  82
  83         /*
  84          * We may want to decompress the packet here.  Packet buffer
  85          * management is a headache (if we decompress, packet will become
  86          * larger).
  87          */
  88         if (nhdr)
  89                 *nhdr = ipcomp->comp_nxt;
  90         advance = sizeof(struct ipcomp);
  91
  92         printf(": ");
  93         return advance;
  94
  95 #endif
  96 fail:
  97         return -1;
  98 }