The Tcpdump Group git mirrors - tcpdump/blob - print-ipcomp.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.12 2000-10-07 05:46:21 itojun Exp $";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <string.h>
  32 #include <sys/param.h>
  33 #include <sys/time.h>
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36
  37 #include <netinet/in.h>
  38
  39 #include <stdio.h>
  40
  41 struct ipcomp {
  42         u_int8_t comp_nxt;      /* Next Header */
  43         u_int8_t comp_flags;    /* Length of data, in 32bit */
  44         u_int16_t comp_cpi;     /* Compression parameter index */
  45 };
  46
  47 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  48 #include <zlib.h>
  49 #endif
  50
  51 #include "interface.h"
  52 #include "addrtoname.h"
  53
  54 int
  55 ipcomp_print(register const u_char *bp, register const u_char *bp2, int *nhdr)
  56 {
  57         register const struct ipcomp *ipcomp;
  58         register const u_char *ep;
  59         u_int16_t cpi;
  60 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  61         int advance;
  62 #endif
  63
  64         ipcomp = (struct ipcomp *)bp;
  65         cpi = (u_int16_t)ntohs(ipcomp->comp_cpi);
  66
  67         /* 'ep' points to the end of available data. */
  68         ep = snapend;
  69
  70         if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
  71                 fputs("[|IPCOMP]", stdout);
  72                 goto fail;
  73         }
  74         printf("IPComp(cpi=%u)", cpi);
  75
  76 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  77         if (1)
  78                 goto fail;
  79
  80         /*
  81          * We may want to decompress the packet here.  Packet buffer
  82          * management is a headache (if we decompress, packet will become
  83          * larger).
  84          */
  85         if (nhdr)
  86                 *nhdr = ipcomp->comp_nxt;
  87         advance = sizeof(struct ipcomp);
  88
  89         printf(": ");
  90         return advance;
  91
  92 #endif
  93 fail:
  94         if (nhdr)
  95                 *nhdr = -1;
  96         return 65536;
  97 }