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.*;
11 import javax.naming.*;
12 import javax.naming.directory.*;
14 // FEATURE: exponential backoff on retry time?
17 private static final Mailbox spool =
18 FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
20 static { new Thread() { public void run() { Outgoing.runq(); } }.start(); }
22 // Server //////////////////////////////////////////////////////////////////////////////
24 public static class Server implements Worker {
25 public void handleRequest(Connection conn) {
26 Log.error(this, "accepted...");
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 if (command == null) return;
33 String c = command.toUpperCase();
34 if (c.startsWith("HELO")) { conn.println("250 HELO " + conn.vhost); from = null; to = new Vector();
35 } else if (c.startsWith("EHLO")) { conn.println("250"); from = null; to = new Vector();
36 } else if (c.startsWith("RSET")) { conn.println("250 reset ok"); from = null; to = new Vector();
37 } else if (c.startsWith("HELP")) { conn.println("214 you are beyond help. see a trained professional.");
38 } else if (c.startsWith("VRFY")) { conn.println("252 We don't VRFY; proceed anyway");
39 } else if (c.startsWith("EXPN")) { conn.println("550 EXPN not available");
40 } else if (c.startsWith("NOOP")) { conn.println("250 OK");
41 } else if (c.startsWith("QUIT")) { conn.println("221 " + conn.vhost + " closing connection"); return;
42 } else if (c.startsWith("MAIL FROM:")) {
43 command = command.substring(10).trim();
44 from = command.equals("<>") ? null : new Address(command);
45 conn.println("250 " + from + " is syntactically correct");
46 } else if (c.startsWith("RCPT TO:")) {
47 //if (from == null) { conn.println("503 MAIL FROM must precede RCPT TO"); continue; }
48 command = command.substring(8).trim();
49 if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
50 Address addr = new Address(command);
51 if (addr.isLocal()) conn.println("250 " + addr + " is on this machine; I will deliver it");
52 else if (conn.getRemoteAddress().isLoopbackAddress())
53 conn.println("250 you are connected locally, so I will let you send");
54 else { conn.println("551 sorry, " + addr + " is not on this machine"); }
56 } else if (c.startsWith("DATA")) {
57 if (from == null) { conn.println("503 MAIL FROM command must precede DATA"); continue; }
58 if (to == null) { conn.println("503 RCPT TO command must precede DATA"); continue; }
59 conn.println("354 Enter message, ending with \".\" on a line by itself");
62 StringBuffer buf = new StringBuffer();
64 String s = conn.readln();
65 if (s == null) throw new RuntimeException("connection closed");
66 if (s.equals(".")) break;
67 if (s.startsWith(".")) s = s.substring(1);
68 buf.append(s + "\r\n");
70 String body = buf.toString();
72 for(int i=0; i<to.size(); i++) {
73 m = new Message(new Stream(body), new Message.Envelope(from, (Address)to.elementAt(i), new Date()));
74 if (!m.envelope.to.isLocal()) Outgoing.accept(m);
75 else Target.root.accept(m);
77 if (m != null) Log.info(SMTP.class, "accepted message: " + m.summary());
78 conn.println("250 message accepted");
80 from = null; to = new Vector();
81 } catch (MailException.Malformed mfe) { conn.println("501 " + mfe.toString());
82 } catch (MailException.MailboxFull mbf) { conn.println("452 " + mbf);
83 } catch (IOException ioe) {
84 //conn.println("554 " + ioe.toString());
89 } else { conn.println("500 unrecognized command"); }
90 } catch (Message.Malformed e) { conn.println("501 " + e.toString()); /* FIXME could be wrong code */ }
95 // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
97 public static class Outgoing {
99 private static final HashSet deadHosts = new HashSet();
100 public static void accept(Message m) throws IOException {
101 if (m == null) { Log.warn(Outgoing.class, "attempted to accept(null)"); return; }
102 //Log.info(SMTP.class, "queued: " + m.summary());
103 if (m.traces.length >= 100)
104 Log.warn(SMTP.Outgoing.class, "Message with " + m.traces.length + " trace hops; dropping\n" + m.summary());
105 else synchronized(Outgoing.class) {
107 Outgoing.class.notify();
111 public static boolean attempt(Message m) throws IOException {
112 InetAddress[] mx = getMailExchangerIPs(m.envelope.to.host);
113 if (mx.length == 0) {
114 Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelope.to.host + "; bouncing it\n" + m.summary());
115 accept(m.bounce("could not resolve " + m.envelope.to.host));
118 if (new Date().getTime() - m.envelope.arrival.getTime() > 1000 * 60 * 60 * 24 * 5) {
119 Log.warn(SMTP.Outgoing.class, "could not send message after 5 days; bouncing it\n" + m.summary());
120 accept(m.bounce("could not send for 5 days"));
123 for(int i=0; i<mx.length; i++) {
124 if (deadHosts.contains(mx[i])) continue;
125 if (attempt(m, mx[i])) { return true; }
130 private static void check(String s, Connection conn) {
131 while (s.charAt(3) == '-') s = conn.readln();
132 if (s.startsWith("4")||s.startsWith("5")) throw new MailException(s);
134 private static boolean attempt(final Message m, final InetAddress mx) {
135 boolean accepted = false;
136 Connection conn = null;
138 Log.info(SMTP.Outgoing.class, "connecting to " + mx + "...");
139 conn = new Connection(new Socket(mx, 25), InetAddress.getLocalHost().getHostName());
140 conn.setTimeout(60 * 1000);
141 Log.info(SMTP.Outgoing.class, " connected");
142 check(conn.readln(), conn); // banner
143 conn.println("HELO " + conn.vhost); check(conn.readln(), conn);
144 conn.println("MAIL FROM:<" + m.envelope.from.user + "@" + m.envelope.from.host+">"); check(conn.readln(), conn);
145 conn.println("RCPT TO:<" + m.envelope.to.user + "@" + m.envelope.to.host+">"); check(conn.readln(), conn);
146 conn.println("DATA"); check(conn.readln(), conn);
147 conn.println(m.toString());
149 check(conn.readln(), conn);
150 Log.info(SMTP.Outgoing.class, " success: message accepted by " + mx);
153 } catch (Exception e) {
154 if (accepted) return true;
155 Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
156 Log.warn(SMTP.Outgoing.class, e);
159 if (conn != null) conn.close();
166 Log.setThreadAnnotation("[outgoing smtp] ");
167 Log.info(SMTP.Outgoing.class, "outgoing thread started; " + spool.count(Query.all()) + " messages to send");
169 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
170 for(Mailbox.Iterator it = spool.iterator(); it.next(); ) {
172 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
173 if (attempt(it.cur())) it.delete();
174 } catch (Exception e) {
175 if (e instanceof InterruptedException) throw e;
176 Log.error(SMTP.Outgoing.class, e);
179 synchronized(Outgoing.class) {
180 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
181 Log.info(SMTP.Outgoing.class, "outgoing thread going to sleep");
182 Outgoing.class.wait(5 * 60 * 1000);
184 Log.info(SMTP.Outgoing.class,"outgoing thread woke up; "+spool.count(Query.all())+" messages in queue");
187 } catch (Exception e) {
188 Log.error(SMTP.Outgoing.class, "outgoing thread killed by exception: " + e);
189 Log.error(SMTP.Outgoing.class, e);
194 public static InetAddress[] getMailExchangerIPs(String hostName) {
197 Hashtable env = new Hashtable();
198 env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
199 DirContext ictx = new InitialDirContext(env);
200 Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });
201 Attribute attr = attrs.get("MX");
203 ret = new InetAddress[1];
205 ret[0] = InetAddress.getByName(hostName);
207 } catch (UnknownHostException uhe) {
208 Log.warn(SMTP.class, "no MX hosts or A record for " + hostName);
209 return new InetAddress[0];
212 ret = new InetAddress[attr.size()];
213 NamingEnumeration ne = attr.getAll();
214 for(int i=0; ne.hasMore(); i++) {
215 String mx = (String)ne.next();
216 // FIXME we should be sorting here
217 mx = mx.substring(mx.indexOf(" ") + 1);
218 if (mx.charAt(mx.length() - 1) == '.') mx = mx.substring(0, mx.length() - 1);
219 ret[i] = InetAddress.getByName(mx);
222 } catch (Exception e) {
223 Log.warn(SMTP.class, "couldn't find MX host for " + hostName + " due to");
224 Log.warn(SMTP.class, e);
225 return new InetAddress[0];