inspammerblacklist.java

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 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
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 * ------------------------------------------------------------------- *
 * Licensed under the Apache License, Version 2.0 (the "License"); you *
 * may not use this file except in compliance with the License. You    *
 * may obtain a copy of the License at:                                *
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 *     http://www.apache.org/licenses/LICENSE-2.0                      *
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 * distributed under the License is distributed on an "AS IS" BASIS,   *
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 * implied.  See the License for the specific language governing       *
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package org.apache.james.transport.matchers;

import org.apache.mailet.GenericMatcher;
import org.apache.mailet.Mail;

import javax.mail.MessagingException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.StringTokenizer;

/**
 * Checks the network IP address of the sending server against a
 * blacklist of spammers.  There are 3 lists that support this...
 * <ul>
 * <li><b>blackholes.mail-abuse.org</b>: Rejected - see  http://www.mail-abuse.org/rbl/
 * <li><b>dialups.mail-abuse.org</b>: Dialup - see http://www.mail-abuse.org/dul/
 * <li><b>relays.mail-abuse.org</b>: Open spam relay - see http://www.mail-abuse.org/rss/
 * </ul>
 *
 * Example:
 * &lt;mailet match="InSpammerBlacklist=blackholes.mail-abuse.org" class="ToProcessor"&gt;
 *   &lt;processor&gt;spam&lt;/processor&gt;
 * &lt;/mailet&gt;
 *
 */
public class InSpammerBlacklist extends GenericMatcher {
    String network = null;

    public void init() throws MessagingException {
        network = getCondition();
    }

    public Collection match(Mail mail) {
        String host = mail.getRemoteAddr();
        try {
            //Have to reverse the octets first
            StringBuffer sb = new StringBuffer();
            StringTokenizer st = new StringTokenizer(host, " .", false);

            while (st.hasMoreTokens()) {
                sb.insert(0, st.nextToken() + ".");
            }

            //Add the network prefix for this blacklist
            sb.append(network);

            //Try to look it up
            org.apache.james.dnsserver.DNSServer.getByName(sb.toString());

            //If we got here, that's bad... it means the host
            //  was found in the blacklist
            return mail.getRecipients();
        } catch (UnknownHostException uhe) {
            //This is good... it's not on the list
            return null;
        }
    }
}