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19
20
21
22 package org.apache.james.transport.matchers;
23
24 import java.net.UnknownHostException;
25 import java.util.Collection;
26 import java.util.StringTokenizer;
27
28 import javax.mail.MessagingException;
29
30 import org.apache.avalon.framework.service.ServiceException;
31 import org.apache.avalon.framework.service.ServiceManager;
32 import org.apache.james.Constants;
33 import org.apache.james.api.dnsservice.DNSService;
34 import org.apache.mailet.base.GenericMatcher;
35 import org.apache.mailet.Mail;
36
37 /**
38 * Checks the network IP address of the sending server against a
39 * blacklist of spammers. There are 3 lists that support this...
40 * <ul>
41 * <li><b>blackholes.mail-abuse.org</b>: Rejected - see http://www.mail-abuse.org/rbl/
42 * <li><b>dialups.mail-abuse.org</b>: Dialup - see http://www.mail-abuse.org/dul/
43 * <li><b>relays.mail-abuse.org</b>: Open spam relay - see http://www.mail-abuse.org/rss/
44 * </ul>
45 *
46 * Example:
47 * <mailet match="InSpammerBlacklist=blackholes.mail-abuse.org." class="ToProcessor">
48 * <processor>spam</processor>
49 * </mailet>
50 *
51 */
52 public class InSpammerBlacklist extends GenericMatcher {
53 private String network = null;
54
55 private DNSService dnsServer;
56
57 public void init() throws MessagingException {
58 network = getCondition();
59
60 // check if the needed condition was given
61 if (network == null) throw new MessagingException("Please configure a blacklist");
62
63 ServiceManager compMgr = (ServiceManager)getMailetContext().getAttribute(Constants.AVALON_COMPONENT_MANAGER);
64
65 try {
66 // Instantiate DNSService
67 dnsServer = (DNSService) compMgr.lookup(DNSService.ROLE);
68 } catch (ServiceException cnfe) {
69 log("Failed to retrieve DNSService" + cnfe.getMessage());
70 } catch (Exception e) {
71 log("Failed to retrieve DNSService:" + e.getMessage());
72 }
73
74 }
75
76 public Collection match(Mail mail) {
77 String host = mail.getRemoteAddr();
78 try {
79 //Have to reverse the octets first
80 StringBuffer sb = new StringBuffer();
81 StringTokenizer st = new StringTokenizer(host, " .", false);
82
83 while (st.hasMoreTokens()) {
84 sb.insert(0, st.nextToken() + ".");
85 }
86
87 //Add the network prefix for this blacklist
88 sb.append(network);
89
90 //Try to look it up
91 dnsServer.getByName(sb.toString());
92
93 //If we got here, that's bad... it means the host
94 // was found in the blacklist
95 return mail.getRecipients();
96 } catch (UnknownHostException uhe) {
97 //This is good... it's not on the list
98 return null;
99 }
100 }
101 }