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 1.9 2000-09-29 04:58:41 guy 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 <net/route.h>
  38
  39 #include <netinet/in.h>
  40
  41 #include <stdio.h>
  42
  43 #ifdef INET6
  44 #include <netinet/ip6.h>
  45 #endif
  46
  47 struct ipcomp {
  48         u_int8_t comp_nxt;      /* Next Header */
  49         u_int8_t comp_flags;    /* Length of data, in 32bit */
  50         u_int16_t comp_cpi;     /* Compression parameter index */
  51 };
  52
  53 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  54 #include <zlib.h>
  55 #endif
  56
  57 #include "interface.h"
  58 #include "addrtoname.h"
  59
  60 int
  61 ipcomp_print(register const u_char *bp, register const u_char *bp2, int *nhdr)
  62 {
  63         register const struct ipcomp *ipcomp;
  64         register const u_char *ep;
  65         u_int16_t cpi;
  66 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  67         int advance;
  68 #endif
  69
  70         ipcomp = (struct ipcomp *)bp;
  71         cpi = (u_int16_t)ntohs(ipcomp->comp_cpi);
  72
  73         /* 'ep' points to the end of avaible data. */
  74         ep = snapend;
  75
  76         if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
  77                 fputs("[|IPCOMP]", stdout);
  78                 goto fail;
  79         }
  80         printf("IPComp(cpi=%u)", cpi);
  81
  82 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  83         if (1)
  84                 goto fail;
  85
  86         /*
  87          * We may want to decompress the packet here.  Packet buffer
  88          * management is a headache (if we decompress, packet will become
  89          * larger).
  90          */
  91         if (nhdr)
  92                 *nhdr = ipcomp->comp_nxt;
  93         advance = sizeof(struct ipcomp);
  94
  95         printf(": ");
  96         return advance;
  97
  98 #endif
  99 fail:
 100         if (nhdr)
 101                 *nhdr = -1;
 102         return 65536;
 103 }