_ipcomp.c

This directory contains source code for tcpdump, a tool for network monitoring and data acquisition

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if 0
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.2.2.2 2000/01/25 18:31:10 itojun Exp $";
#endif

#include <stdio.h>
#include <string.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <net/route.h>
#include <net/if.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <netinet/ipv6.h>

#ifdef USE_ZLIB
  #include <zlib.h>
#endif

#include "interfac.h"
#include "a2name.h"

struct ipcomp {
       u_int8_t  comp_nxt;     /* Next Header */
       u_int8_t  comp_flags;   /* Length of data, in 32bit */
       u_int16_t comp_cpi;     /* Compression parameter index */
     };   

int ipcomp_print (const u_char * bp, const u_char * bp2, int *nhdr)
{
  const struct ipcomp *ipcomp;
  const     u_char    *ep;
  u_int16_t cpi;

#ifdef USE_ZLIB
  int advance;
#endif

  ipcomp = (struct ipcomp *) bp;
  cpi = (u_int16_t) ntohs (ipcomp->comp_cpi);

  /* 'ep' points to the end of avaible data. */
  ep = snapend;

  if ((u_char *) (ipcomp + 1) >= ep - sizeof(struct ipcomp))
  {
    PUTS ("[|IPCOMP]");
    goto fail;
  }
  PRINTF ("IPComp(cpi=%u)", cpi);

#ifdef USE_ZLIB
  if (1)
     goto fail;

  /*
   * We may want to decompress the packet here.  Packet buffer
   * management is a headache (if we decompress, packet will become
   * larger).
   */
  if (nhdr)
     *nhdr = ipcomp->comp_nxt;
  advance  = sizeof(struct ipcomp);

  PUTS (": ");
  return (advance);
#endif

fail:
  if (nhdr)
     *nhdr = -1;
  return 65536;
}