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The source code/* * $Header: /cvsroot/mvnforum/myvietnam/src/net/myvietnam/mvncore/filter/IPFilter.java,v 1.9 2005/01/26 04:54:29 minhnn Exp $ * $Author: minhnn $ * $Revision: 1.9 $ * $Date: 2005/01/26 04:54:29 $ * * ==================================================================== * * Copyright (C) 2002-2005 by MyVietnam.net * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or any later version. * * All copyright notices regarding MyVietnam and MyVietnam CoreLib * MUST remain intact in the scripts and source code. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Correspondence and Marketing Questions can be sent to: * info@MyVietnam.net * * @author: Minh Nguyen minhnn@MyVietnam.net * @author: Mai Nguyen mai.nh@MyVietnam.net */ package net.myvietnam.mvncore.filter; import javax.servlet.http.HttpServletRequest; import net.myvietnam.mvncore.MVNCoreConfig; import net.myvietnam.mvncore.util.StringUtil; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.regexp.RE; public final class IPFilter { private static Log log = LogFactory.getLog(IPFilter.class); private static RE[] blockedIPs = null; private IPFilter() { //prevent instantiation } static { //IPOptions ipOptions = new IPOptions(); //String[] blockedIPArray = StringUtil.getStringArray(ipOptions.blockedIP, ";"); String[] blockedIPArray = StringUtil.getStringArray(MVNCoreConfig.getBlockedIPs(), ";"); blockedIPs = new RE[blockedIPArray.length]; for (int i = 0; i < blockedIPArray.length; i++) { String currentIPRegExp = StringUtil.replace(blockedIPArray[i], '*', "(\\d{1,3})"); currentIPRegExp = "^" + currentIPRegExp + "$"; try { log.debug("currentIPRegExp = " + currentIPRegExp); blockedIPs[i] = new RE(currentIPRegExp); } catch (Exception ex) { log.error("Cannot parse the regular expression = " + currentIPRegExp, ex); } } } /** * Filter the IP * @param request * @return true if the IP in this request is ok * false if the IP in this request is blocked */ public static boolean filter(HttpServletRequest request) { if (request == null) { throw new NullPointerException("Cannot accept a null request in IPFilter"); } String checkIP = request.getRemoteAddr(); for (int i = 0; i < blockedIPs.length; i++) { RE currentBlockedIP = blockedIPs[i]; if (currentBlockedIP != null) { synchronized (currentBlockedIP) { if (currentBlockedIP.match(checkIP)) { return false; } } } } return true; } } |
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