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 1.8 2000-09-28 06:43:01 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 #include <netinet/in_systm.h>
  41
  42 #include <stdio.h>
  43
  44 #ifdef INET6
  45 #include <netinet/ip6.h>
  46 #endif
  47
  48 struct ipcomp {
  49         u_int8_t comp_nxt;      /* Next Header */
  50         u_int8_t comp_flags;    /* Length of data, in 32bit */
  51         u_int16_t comp_cpi;     /* Compression parameter index */
  52 };
  53
  54 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  55 #include <zlib.h>
  56 #endif
  57
  58 #include "interface.h"
  59 #include "addrtoname.h"
  60
  61 int
  62 ipcomp_print(register const u_char *bp, register const u_char *bp2, int *nhdr)
  63 {
  64         register const struct ipcomp *ipcomp;
  65         register const u_char *ep;
  66         u_int16_t cpi;
  67 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  68         int advance;
  69 #endif
  70
  71         ipcomp = (struct ipcomp *)bp;
  72         cpi = (u_int16_t)ntohs(ipcomp->comp_cpi);
  73
  74         /* 'ep' points to the end of avaible data. */
  75         ep = snapend;
  76
  77         if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
  78                 fputs("[|IPCOMP]", stdout);
  79                 goto fail;
  80         }
  81         printf("IPComp(cpi=%u)", cpi);
  82
  83 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  84         if (1)
  85                 goto fail;
  86
  87         /*
  88          * We may want to decompress the packet here.  Packet buffer
  89          * management is a headache (if we decompress, packet will become
  90          * larger).
  91          */
  92         if (nhdr)
  93                 *nhdr = ipcomp->comp_nxt;
  94         advance = sizeof(struct ipcomp);
  95
  96         printf(": ");
  97         return advance;
  98
  99 #endif
 100 fail:
 101         if (nhdr)
 102                 *nhdr = -1;
 103         return 65536;
 104 }