print-ipcomp.c revision 146774
1254721Semaste/* 2254721Semaste * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994 3254721Semaste * The Regents of the University of California. All rights reserved. 4254721Semaste * 5254721Semaste * Redistribution and use in source and binary forms, with or without 6254721Semaste * modification, are permitted provided that: (1) source code distributions 7254721Semaste * retain the above copyright notice and this paragraph in its entirety, (2) 8254721Semaste * distributions including binary code include the above copyright notice and 9254721Semaste * this paragraph in its entirety in the documentation or other materials 10254721Semaste * provided with the distribution, and (3) all advertising materials mentioning 11254721Semaste * features or use of this software display the following acknowledgement: 12254721Semaste * ``This product includes software developed by the University of California, 13314564Sdim * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14314564Sdim * the University nor the names of its contributors may be used to endorse 15254721Semaste * or promote products derived from this software without specific prior 16254721Semaste * written permission. 17314564Sdim * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18296417Sdim * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19309124Sdim * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20296417Sdim */ 21254721Semaste 22254721Semaste#ifndef lint 23254721Semastestatic const char rcsid[] _U_ = 24254721Semaste "@(#) $Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.20 2003/11/19 00:36:08 guy Exp $"; 25254721Semaste#endif 26288943Sdim 27254721Semaste#ifdef HAVE_CONFIG_H 28254721Semaste#include "config.h" 29314564Sdim#endif 30254721Semaste 31288943Sdim#include <string.h> 32288943Sdim#include <tcpdump-stdinc.h> 33254721Semaste 34314564Sdim#include <stdio.h> 35254721Semaste 36314564Sdimstruct ipcomp { 37254721Semaste u_int8_t comp_nxt; /* Next Header */ 38314564Sdim u_int8_t comp_flags; /* Length of data, in 32bit */ 39254721Semaste u_int16_t comp_cpi; /* Compression parameter index */ 40314564Sdim}; 41314564Sdim 42314564Sdim#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 43314564Sdim#include <zlib.h> 44314564Sdim#endif 45254721Semaste 46314564Sdim#include "interface.h" 47314564Sdim#include "addrtoname.h" 48314564Sdim#include "extract.h" 49314564Sdim 50314564Sdimint 51314564Sdimipcomp_print(register const u_char *bp, int *nhdr _U_) 52314564Sdim{ 53314564Sdim register const struct ipcomp *ipcomp; 54314564Sdim register const u_char *ep; 55314564Sdim u_int16_t cpi; 56314564Sdim#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 57314564Sdim int advance; 58314564Sdim#endif 59314564Sdim 60314564Sdim ipcomp = (struct ipcomp *)bp; 61314564Sdim cpi = EXTRACT_16BITS(&ipcomp->comp_cpi); 62314564Sdim 63314564Sdim /* 'ep' points to the end of available data. */ 64314564Sdim ep = snapend; 65314564Sdim 66254721Semaste if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) { 67314564Sdim fputs("[|IPCOMP]", stdout); 68254721Semaste goto fail; 69314564Sdim } 70314564Sdim printf("IPComp(cpi=0x%04x)", cpi); 71314564Sdim 72314564Sdim#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 73314564Sdim if (1) 74314564Sdim goto fail; 75314564Sdim 76262528Semaste /* 77314564Sdim * We may want to decompress the packet here. Packet buffer 78296417Sdim * management is a headache (if we decompress, packet will become 79314564Sdim * larger). 80254721Semaste */ 81314564Sdim if (nhdr) 82254721Semaste *nhdr = ipcomp->comp_nxt; 83314564Sdim advance = sizeof(struct ipcomp); 84314564Sdim 85254721Semaste printf(": "); 86314564Sdim return advance; 87314564Sdim 88254721Semaste#endif 89314564Sdimfail: 90254721Semaste return -1; 91314564Sdim} 92314564Sdim