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 1.3 2000-01-09 21:34:18 fenner 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 #ifdef HAVE_NETINET6_IPCOMP_H
  56 #include <netinet6/ipcomp.h>
  57 #else
  58 struct ipcomp {
  59         u_int8_t comp_nxt;      /* Next Header */
  60         u_int8_t comp_flags;    /* Length of data, in 32bit */
  61         u_int16_t comp_cpi;     /* Compression parameter index */
  62 };
  63 #endif
  64
  65 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  66 #include <zlib.h>
  67 #endif
  68
  69 #include "interface.h"
  70 #include "addrtoname.h"
  71
  72 int
  73 ipcomp_print(register const u_char *bp, register const u_char *bp2, int *nhdr)
  74 {
  75         register const struct ipcomp *ipcomp;
  76         register const u_char *ep;
  77         u_int16_t cpi;
  78 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  79         int advance;
  80 #endif
  81
  82         ipcomp = (struct ipcomp *)bp;
  83         cpi = (u_int16_t)ntohs(ipcomp->comp_cpi);
  84
  85         /* 'ep' points to the end of avaible data. */
  86         ep = snapend;
  87
  88         if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
  89                 fputs("[|IPCOMP]", stdout);
  90                 goto fail;
  91         }
  92         printf("IPComp(cpi=%u)", cpi);
  93
  94 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
  95         if (1)
  96                 goto fail;
  97
  98         /*
  99          * We may want to decompress the packet here.  Packet buffer
 100          * management is a headache (if we decompress, packet will become
 101          * larger).
 102          */
 103         if (nhdr)
 104                 *nhdr = ipcomp->comp_nxt;
 105         advance = sizeof(struct ipcomp);
 106
 107         printf(": ");
 108         return advance;
 109
 110 #endif
 111 fail:
 112         if (nhdr)
 113                 *nhdr = -1;
 114         return 65536;
 115 }