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 1.4 2000-01-19 04:51:11 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 <net/route.h>
  38 #include <net/if.h>
  39
  40 #include <netinet/in.h>
  41 #include <netinet/if_ether.h>
  42 #include <netinet/in_systm.h>
  43 #include <netinet/ip.h>
  44 #include <netinet/ip_icmp.h>
  45 #include <netinet/ip_var.h>
  46 #include <netinet/udp.h>
  47 #include <netinet/udp_var.h>
  48 #include <netinet/tcp.h>
  49
  50 #include <stdio.h>
  51
  52 #ifdef INET6
  53 #include <netinet/ip6.h>
  54 #endif
  55
  56 struct ipcomp {
  57         u_int8_t comp_nxt;      /* Next Header */
  58         u_int8_t comp_flags;    /* Length of data, in 32bit */
  59         u_int16_t comp_cpi;     /* Compression parameter index */
  60 };
  61
  62 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  63 #include <zlib.h>
  64 #endif
  65
  66 #include "interface.h"
  67 #include "addrtoname.h"
  68
  69 int
  70 ipcomp_print(register const u_char *bp, register const u_char *bp2, int *nhdr)
  71 {
  72         register const struct ipcomp *ipcomp;
  73         register const u_char *ep;
  74         u_int16_t cpi;
  75 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  76         int advance;
  77 #endif
  78
  79         ipcomp = (struct ipcomp *)bp;
  80         cpi = (u_int16_t)ntohs(ipcomp->comp_cpi);
  81
  82         /* 'ep' points to the end of avaible data. */
  83         ep = snapend;
  84
  85         if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
  86                 fputs("[|IPCOMP]", stdout);
  87                 goto fail;
  88         }
  89         printf("IPComp(cpi=%u)", cpi);
  90
  91 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  92         if (1)
  93                 goto fail;
  94
  95         /*
  96          * We may want to decompress the packet here.  Packet buffer
  97          * management is a headache (if we decompress, packet will become
  98          * larger).
  99          */
 100         if (nhdr)
 101                 *nhdr = ipcomp->comp_nxt;
 102         advance = sizeof(struct ipcomp);
 103
 104         printf(": ");
 105         return advance;
 106
 107 #endif
 108 fail:
 109         if (nhdr)
 110                 *nhdr = -1;
 111         return 65536;
 112 }