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/*
* 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.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.20 2003-11-19 00:36:08 guy Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <tcpdump-stdinc.h>
#include <stdio.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 */
};
#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
#include <zlib.h>
#endif
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
int
ipcomp_print(register const u_char *bp, int *nhdr _U_)
{
register const struct ipcomp *ipcomp;
register const u_char *ep;
u_int16_t cpi;
#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
int advance;
#endif
ipcomp = (struct ipcomp *)bp;
cpi = EXTRACT_16BITS(&ipcomp->comp_cpi);
/* 'ep' points to the end of available data. */
ep = snapend;
if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
fputs("[|IPCOMP]", stdout);
goto fail;
}
printf("IPComp(cpi=0x%04x)", cpi);
#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
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);
printf(": ");
return advance;
#endif
fail:
return -1;
}