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19
20
21
22 package org.apache.james.transport.matchers;
23
24 import org.apache.mailet.Mail;
25
26 import java.util.Collection;
27
28 /**
29 * Does a DNS lookup (MX and A/CNAME records) on the sender's domain. If
30 * there are no entries, the domain is considered fake and the match is
31 * successful.
32 *
33 */
34 public class SenderInFakeDomain extends AbstractNetworkMatcher {
35
36 public Collection match(Mail mail) {
37 if (mail.getSender() == null) {
38 return null;
39 }
40 String domain = mail.getSender().getHost();
41 //DNS Lookup for this domain
42 Collection servers = getMailetContext().getMailServers(domain);
43 if (servers.size() == 0) {
44 //No records...could not deliver to this domain, so matches criteria.
45 log("No MX, A, or CNAME record found for domain: " + domain);
46 return mail.getRecipients();
47 } else if (matchNetwork(servers.iterator().next().toString())){
48 /*
49 * It could be a wildcard address like these:
50 *
51 * 64.55.105.9/32 # Allegiance Telecom Companies Worldwide (.nu)
52 * 64.94.110.11/32 # VeriSign (.com .net)
53 * 194.205.62.122/32 # Network Information Center - Ascension Island (.ac)
54 * 194.205.62.62/32 # Internet Computer Bureau (.sh)
55 * 195.7.77.20/32 # Fredrik Reutersward Data (.museum)
56 * 206.253.214.102/32 # Internap Network Services (.cc)
57 * 212.181.91.6/32 # .NU Domain Ltd. (.nu)
58 * 219.88.106.80/32 # Telecom Online Solutions (.cx)
59 * 194.205.62.42/32 # Internet Computer Bureau (.tm)
60 * 216.35.187.246/32 # Cable & Wireless (.ws)
61 * 203.119.4.6/32 # .PH TLD (.ph)
62 *
63 */
64 log("Banned IP found for domain: " + domain);
65 log(" --> :" + servers.iterator().next().toString());
66 return mail.getRecipients();
67 } else {
68 // Some servers were found... the domain is not fake.
69
70 return null;
71 }
72 }
73 }