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19  
20  package org.apache.james.transport.matchers;
21  
22  import org.apache.mailet.GenericMatcher;
23  import org.apache.mailet.Mail;
24  
25  import javax.mail.MessagingException;
26  import java.net.InetAddress;
27  import java.net.UnknownHostException;
28  import java.util.Collection;
29  import java.util.StringTokenizer;
30  
31  /***
32   * Checks the network IP address of the sending server against a
33   * blacklist of spammers.  There are 3 lists that support this...
34   * <ul>
35   * <li><b>blackholes.mail-abuse.org</b>: Rejected - see  http://www.mail-abuse.org/rbl/
36   * <li><b>dialups.mail-abuse.org</b>: Dialup - see http://www.mail-abuse.org/dul/
37   * <li><b>relays.mail-abuse.org</b>: Open spam relay - see http://www.mail-abuse.org/rss/
38   * </ul>
39   *
40   * Example:
41   * &lt;mailet match="InSpammerBlacklist=blackholes.mail-abuse.org" class="ToProcessor"&gt;
42   *   &lt;processor&gt;spam&lt;/processor&gt;
43   * &lt;/mailet&gt;
44   *
45   */
46  public class InSpammerBlacklist extends GenericMatcher {
47      String network = null;
48  
49      public void init() throws MessagingException {
50          network = getCondition();
51      }
52  
53      public Collection match(Mail mail) {
54          String host = mail.getRemoteAddr();
55          try {
56              //Have to reverse the octets first
57              StringBuffer sb = new StringBuffer();
58              StringTokenizer st = new StringTokenizer(host, " .", false);
59  
60              while (st.hasMoreTokens()) {
61                  sb.insert(0, st.nextToken() + ".");
62              }
63  
64              //Add the network prefix for this blacklist
65              sb.append(network);
66  
67              //Try to look it up
68              org.apache.james.dnsserver.DNSServer.getByName(sb.toString());
69  
70              //If we got here, that's bad... it means the host
71              //  was found in the blacklist
72              return mail.getRecipients();
73          } catch (UnknownHostException uhe) {
74              //This is good... it's not on the list
75              return null;
76          }
77      }
78  }