source: rtems-libbsd/freebsd/contrib/tcpdump/print-ipcomp.c @ 084d4db

#include <machine/rtems-bsd-user-space.h>

/*
 * 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;
}