?? print-ipcomp.c
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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 lintstatic 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"intipcomp_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;#endiffail: return -1;}
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