1 package org.ibex.mail.protocol;
2 import org.ibex.mail.*;
3 import org.ibex.mail.target.*;
4 import org.ibex.jinetd.Worker;
5 import org.ibex.util.*;
12 import javax.naming.*;
13 import javax.naming.directory.*;
15 // FEATURE: exponential backoff on retry time?
18 private static final Mailbox spool =
19 FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
21 static { new Thread() { public void run() { Outgoing.runq(); } }.start(); }
23 // Server //////////////////////////////////////////////////////////////////////////////
25 public static class Server implements Worker {
26 public void handleRequest(Connection conn) {
27 conn.setTimeout(5 * 60 * 1000);
28 conn.println("220 " + conn.vhost + " SMTP " + this.getClass().getName());
30 Vector to = new Vector();
31 for(String command = conn.readln(); ; command = conn.readln()) try {
32 String c = command.toUpperCase();
33 if (c.startsWith("HELO")) { conn.println("250 HELO " + conn.vhost); from = null; to = new Vector();
34 } else if (c.startsWith("EHLO")) { conn.println("250"); from = null; to = new Vector();
35 } else if (c.startsWith("RSET")) { conn.println("250 reset ok"); from = null; to = new Vector();
36 } else if (c.startsWith("HELP")) { conn.println("214 you are beyond help. see a trained professional.");
37 } else if (c.startsWith("VRFY")) { conn.println("252 We don't VRFY; proceed anyway");
38 } else if (c.startsWith("EXPN")) { conn.println("550 EXPN not available");
39 } else if (c.startsWith("NOOP")) { conn.println("250 OK");
40 } else if (c.startsWith("QUIT")) { conn.println("221 " + conn.vhost + " closing connection"); return;
41 } else if (c.startsWith("MAIL FROM:")) {
42 conn.println("250 " + (from = new Address(command.substring(10).trim())) + " is syntactically correct");
43 } else if (c.startsWith("RCPT TO:")) {
44 if (from == null) { conn.println("503 MAIL FROM must precede RCPT TO"); continue; }
45 command = command.substring(8).trim();
46 if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
47 Address addr = new Address(command);
48 if (addr.isLocal()) conn.println("250 " + addr + " is on this machine; I will deliver it");
49 else if (conn.getRemoteAddress().isLoopbackAddress())
50 conn.println("250 you are connected locally, so I will let you send");
51 else { conn.println("551 sorry, " + addr + " is not on this machine"); }
53 } else if (c.startsWith("DATA")) {
54 if (from == null) { conn.println("503 MAIL FROM command must precede DATA"); continue; }
55 if (to == null) { conn.println("503 RCPT TO command must precede DATA"); continue; }
56 conn.println("354 Enter message, ending with \".\" on a line by itself");
59 StringBuffer buf = new StringBuffer();
61 String s = conn.readln();
62 if (s == null) throw new RuntimeException("connection closed");
63 if (s.equals(".")) break;
64 if (s.startsWith(".")) s = s.substring(1);
65 buf.append(s + "\r\n");
67 String body = buf.toString();
69 for(int i=0; i<to.size(); i++) {
70 m = new Message(from, (Address)to.elementAt(i), new Stream(body));
71 if (!m.envelopeTo.isLocal()) Outgoing.accept(m);
72 else Target.root.accept(m);
74 if (m != null) Log.error(SMTP.class, "accepted message: " + m.summary());
75 conn.println("250 message accepted");
77 from = null; to = new Vector();
78 } catch (MailException.Malformed mfe) { conn.println("501 " + mfe.toString());
79 } catch (MailException.MailboxFull mbf) { conn.println("452 " + mbf);
80 } catch (IOException ioe) { conn.println("554 " + ioe.toString());
82 } else { conn.println("500 unrecognized command"); }
83 } catch (Message.Malformed e) { conn.println("501 " + e.toString()); /* FIXME could be wrong code */ }
88 // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
90 public static class Outgoing {
92 private static final HashSet deadHosts = new HashSet();
93 public static void accept(Message m) throws IOException {
94 Log.error("[outgoing]", "accept():\n" + m.summary());
95 if (m.traces.length >= 100)
96 Log.warn(SMTP.Outgoing.class, "Message with " + m.traces.length + " trace hops; dropping\n" + m.summary());
97 else synchronized(Outgoing.class) {
99 Outgoing.class.notify();
103 private static boolean attempt(Message m) throws IOException {
104 InetAddress[] mx = getMailExchangerIPs(m.envelopeTo.host);
105 if (mx.length == 0) {
106 Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelopeTo.host + "; bouncing it\n" + m.summary());
107 accept(m.bounce("could not resolve " + m.envelopeTo.host));
110 if (new Date().getTime() - m.arrival.getTime() > 1000 * 60 * 60 * 24 * 5) {
111 Log.warn(SMTP.Outgoing.class, "could not send message after 5 days; bouncing it\n" + m.summary());
112 accept(m.bounce("could not send for 5 days"));
115 for(int i=0; i<mx.length; i++) {
116 if (deadHosts.contains(mx[i])) continue;
117 if (attempt(m, mx[i])) { return true; }
122 private static void check(String s) { if (s.startsWith("4")||s.startsWith("5")) throw new MailException(s); }
123 private static boolean attempt(final Message m, final InetAddress mx) {
124 boolean accepted = false;
126 Log.info(SMTP.Outgoing.class, "connecting to " + mx + "...");
127 Connection conn = new Connection(new Socket(mx, 25), InetAddress.getLocalHost().getHostName());
128 Log.info(SMTP.Outgoing.class, "connected");
129 check(conn.readln()); // banner
130 conn.println("HELO " + conn.vhost); check(conn.readln());
131 conn.println("MAIL FROM: " + m.envelopeFrom.user + "@" + m.envelopeFrom.host); check(conn.readln());
132 conn.println("RCPT TO: " + m.envelopeTo.user + "@" + m.envelopeTo.host); check(conn.readln());
133 conn.println("DATA"); check(conn.readln());
134 conn.println(m.toString());
136 check(conn.readln());
137 Log.info(SMTP.Outgoing.class, "message accepted by " + mx);
140 } catch (Exception e) {
141 if (accepted) return true;
142 Log.warn(SMTP.Outgoing.class, "unable to send; error=" + e);
143 Log.warn(SMTP.Outgoing.class, e);
145 } finally { Log.setThreadAnnotation("[outgoing smtp] "); }
151 Log.setThreadAnnotation("[outgoing smtp] ");
152 Log.info(SMTP.Outgoing.class, "outgoing thread started; " + spool.count(Query.all()) + " messages to send");
154 for(Mailbox.Iterator it = spool.iterator(); it.next(); )
155 try { if (attempt(it.cur())) it.delete(); }
156 catch (IOException e) { Log.error(SMTP.Outgoing.class, e); }
157 synchronized(Outgoing.class) {
158 Log.info(SMTP.Outgoing.class, "outgoing thread going to sleep");
159 Outgoing.class.wait(10 * 60 * 1000);
161 Log.info(SMTP.Outgoing.class,"outgoing thread woke up; "+spool.count(Query.all())+" messages in queue");
164 } catch (Exception e) { Log.error(SMTP.Outgoing.class, e); }
168 public static InetAddress[] getMailExchangerIPs(String hostName) {
171 Hashtable env = new Hashtable();
172 env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
173 DirContext ictx = new InitialDirContext(env);
174 Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });
175 Attribute attr = attrs.get("MX");
177 ret = new InetAddress[1];
179 ret[0] = InetAddress.getByName(hostName);
181 } catch (UnknownHostException uhe) {
182 Log.warn(SMTP.class, "no MX hosts or A record for " + hostName);
183 return new InetAddress[0];
186 ret = new InetAddress[attr.size()];
187 NamingEnumeration ne = attr.getAll();
188 for(int i=0; ne.hasMore(); i++) {
189 String mx = (String)ne.next();
190 // FIXME we should be sorting here
191 mx = mx.substring(mx.indexOf(" ") + 1);
192 if (mx.charAt(mx.length() - 1) == '.') mx = mx.substring(0, mx.length() - 1);
193 ret[i] = InetAddress.getByName(mx);
196 } catch (Exception e) {
197 Log.warn(SMTP.class, "couldn't find MX host for " + hostName + " due to");
198 Log.warn(SMTP.class, e);
199 return new InetAddress[0];