mitm.common.util.InetNetworkFilter.java Source code

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Here is the source code for mitm.common.util.InetNetworkFilter.java

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/*
 * Copyright (c) 2008-2012, Martijn Brinkers, Djigzo.
 * 
 * This file is part of Djigzo email encryption.
 *
 * Djigzo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License 
 * version 3, 19 November 2007 as published by the Free Software 
 * Foundation.
 *
 * Djigzo 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public 
 * License along with Djigzo. If not, see <http://www.gnu.org/licenses/>
 *
 * Additional permission under GNU AGPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, 
 * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, 
 * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, 
 * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, 
 * wsdl4j-1.6.1.jar (or modified versions of these libraries), 
 * containing parts covered by the terms of Eclipse Public License, 
 * tyrex license, freemarker license, dom4j license, mx4j license,
 * Spice Software License, Common Development and Distribution License
 * (CDDL), Common Public License (CPL) the licensors of this Program grant 
 * you additional permission to convey the resulting work.
 */

package mitm.common.util;

import java.net.UnknownHostException;
import java.util.Collection;
import java.util.LinkedList;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * InetNetworkFilter can be used to check whether an IP address matches a list of networks in mask or cidr format.
 * 
 * @author Martijn Brinkers
 *
 */
public class InetNetworkFilter {
    private final static Logger logger = LoggerFactory.getLogger(InetNetworkFilter.class);

    private final Collection<InetNetwork> networks = new LinkedList<InetNetwork>();

    /**
     * @param filterSpec comma separated networks
     * @throws UnknownHostException 
     */
    public InetNetworkFilter(String filterSpec) throws UnknownHostException {
        Check.notNull(filterSpec, "filterSpec");

        String[] filterSpecs = StringUtils.split(filterSpec, ',');

        for (String spec : filterSpecs) {
            if (spec != null) {
                networks.add(InetNetwork.getFromString(spec.trim()));
            }
        }
    }

    /**
     * Returns true if the address is accepted by this filter, false if not.
     */
    public synchronized boolean isAccepted(String address) {
        for (InetNetwork network : networks) {
            try {
                if (network.contains(address)) {
                    return true;
                }
            } catch (UnknownHostException e) {
                logger.warn("UnknownHostException. Message: " + e.getMessage());
            }
        }

        return false;
    }
}