1 // Copyright 2000-2005 the Contributors, as shown in the revision logs.
2 // Licensed under the Apache Public Source License 2.0 ("the License").
3 // You may not use this file except in compliance with the License.
5 package org.ibex.mail.protocol;
6 import org.ibex.mail.*;
7 import org.ibex.mail.target.*;
8 import org.ibex.jinetd.Worker;
9 import org.ibex.util.*;
15 import javax.naming.*;
16 import javax.naming.directory.*;
18 // FIXME: bounce messages (must go to return-path unless empty, in which case do not send
19 // FIXME: if more than 100 "Received" lines, must drop message
20 // FEATURE: infer messageid, date, if not present (?)
21 // FEATURE: RFC2822, section 4.5.1: special "postmaster" address
22 // FEATURE: RFC2822, section 4.5.4.1: retry strategies
23 // FEATURE: RFC2822, section 5, multiple MX records, preferences, ordering
24 // FEATURE: exponential backoff on retry time?
25 // FEATURE: RFC2822, end of 4.1.2: backslashes in headers
28 public static final SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z");
29 private static final Mailbox spool =
30 FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
32 static { new Thread() { public void run() { Outgoing.runq(); } }.start(); }
34 public static class SMTPException extends MailException {
37 public SMTPException(String s) {
38 code = Integer.parseInt(s.substring(0, s.indexOf(' ')));
39 message = s.substring(s.indexOf(' ')+1);
41 public String toString() { return "SMTP " + code + ": " + message; }
42 public String getMessage() { return toString(); }
45 // Server //////////////////////////////////////////////////////////////////////////////
47 public static class Server implements Worker {
48 public void handleRequest(Connection conn) {
49 conn.setTimeout(5 * 60 * 1000);
50 conn.setNewline("\r\n");
51 conn.println("220 " + conn.vhost + " SMTP " + this.getClass().getName());
53 Vector to = new Vector();
55 String remotehost = null;
56 for(String command = conn.readln(); ; command = conn.readln()) try {
57 if (command == null) return;
58 String c = command.toUpperCase();
59 if (c.startsWith("HELO")) {
60 remotehost = c.substring(5).trim();
61 conn.println("250 HELO " + conn.vhost);
62 from = null; to = new Vector();
63 } else if (c.startsWith("EHLO")) {
64 remotehost = c.substring(5).trim();
67 from = null; to = new Vector();
68 } else if (c.startsWith("RSET")) { conn.println("250 reset ok"); from = null; to = new Vector();
69 } else if (c.startsWith("HELP")) { conn.println("214 you are beyond help. see a trained professional.");
70 } else if (c.startsWith("VRFY")) { conn.println("502 VRFY not supported");
71 } else if (c.startsWith("EXPN")) { conn.println("502 EXPN not supported");
72 } else if (c.startsWith("NOOP")) { conn.println("250 OK");
73 } else if (c.startsWith("QUIT")) { conn.println("221 " + conn.vhost + " closing connection"); return;
74 } else if (c.startsWith("MAIL FROM:")) {
75 command = command.substring(10).trim();
76 from = command.equals("<>") ? null : new Address(command);
77 conn.println("250 " + from + " is syntactically correct");
78 } else if (c.startsWith("RCPT TO:")) {
79 // some clients are broken and put RCPT first; we will tolerate this
80 command = command.substring(8).trim();
81 if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
82 Address addr = new Address(command);
84 // FEATURE: should check the address further and give 550 if undeliverable
85 conn.println("250 " + addr + " is on this machine; I will deliver it");
86 } else if (conn.getRemoteAddress().isLoopbackAddress())
87 conn.println("250 you are connected locally, so I will let you send");
88 else { conn.println("551 sorry, " + addr + " is not on this machine"); }
90 } else if (c.startsWith("DATA")) {
91 //if (from == null) { conn.println("503 MAIL FROM command must precede DATA"); continue; }
92 if (to == null) { conn.println("503 RCPT TO command must precede DATA"); continue; }
93 conn.println("354 Enter message, ending with \".\" on a line by itself");
96 StringBuffer buf = new StringBuffer();
97 buf.append("Received: from " + conn.getRemoteHostname() + " (" + remotehost + ")\r\n");
98 buf.append(" by "+conn.vhost+" ("+SMTP.class.getName()+") with "+(ehlo?"ESMTP":"SMTP") + "\r\n");
99 buf.append(" for "); for(int i=0; i<to.size(); i++) buf.append(to.elementAt(i) + " ");
100 buf.append("; " + dateFormat.format(new Date()) + "\r\n");
102 String s = conn.readln();
103 if (s == null) throw new RuntimeException("connection closed");
104 if (s.equals(".")) break;
105 if (s.startsWith(".")) s = s.substring(1);
106 buf.append(s + "\r\n");
108 String body = buf.toString();
110 for(int i=0; i<to.size(); i++) {
111 m = Message.newMessage(new Fountain.StringFountain(body), from, (Address)to.elementAt(i));
112 if (!m.envelopeTo.isLocal()) Outgoing.accept(m);
113 else Target.root.accept(m);
115 if (m != null) Log.info(SMTP.class, "accepted message: " + m.summary());
116 conn.println("250 message accepted");
118 from = null; to = new Vector();
119 } catch (MailException.Malformed mfe) { conn.println("501 " + mfe.toString());
120 } catch (MailException.MailboxFull mbf) { conn.println("452 " + mbf);
121 } catch (Later.LaterException le) { conn.println("453 try again later");
122 } catch (IOException ioe) {
123 //conn.println("554 " + ioe.toString());
124 Log.error(this, ioe);
128 } else { conn.println("500 unrecognized command"); }
129 } catch (Message.Malformed e) { conn.println("501 " + e.toString()); }
134 // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
136 public static class Outgoing {
138 private static final HashSet deadHosts = new HashSet();
139 public static void accept(Message m) throws IOException {
140 if (m == null) { Log.warn(Outgoing.class, "attempted to accept(null)"); return; }
141 //Log.info(SMTP.class, "queued: " + m.summary());
143 if (m.traces.length >= 100)
144 Log.warn(SMTP.Outgoing.class, "Message with " + m.traces.length + " trace hops; dropping\n" + m.summary());
146 else synchronized(Outgoing.class) {
148 Outgoing.class.notify();
152 public static boolean attempt(Message m) throws IOException {
153 if (m.envelopeTo == null) {
154 Log.warn(SMTP.Outgoing.class, "aieeee, null envelopeTo: " + m.summary());
157 InetAddress[] mx = getMailExchangerIPs(m.envelopeTo.host);
158 if (mx.length == 0) {
159 Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelopeTo.host + "; bouncing it\n" + m.summary());
160 accept(m.bounce("could not resolve " + m.envelopeTo.host));
163 if (new Date().getTime() - m.arrival.getTime() > 1000 * 60 * 60 * 24 * 5) {
164 Log.warn(SMTP.Outgoing.class, "could not send message after 5 days; bouncing it\n" + m.summary());
165 accept(m.bounce("could not send for 5 days"));
168 for(int i=0; i<mx.length; i++) {
169 if (deadHosts.contains(mx[i])) continue;
170 if (attempt(m, mx[i])) { return true; }
175 private static void check(String s, Connection conn) {
176 while (s.length() > 3 && s.charAt(3) == '-') s = conn.readln();
177 if (s.startsWith("4")||s.startsWith("5")) throw new SMTPException(s);
179 private static boolean attempt(final Message m, final InetAddress mx) {
180 boolean accepted = false;
181 Connection conn = null;
183 Log.note("connecting to " + mx + "...");
184 conn = new Connection(new Socket(mx, 25), InetAddress.getLocalHost().getHostName());
185 conn.setNewline("\r\n");
186 conn.setTimeout(60 * 1000);
187 Log.note(" connected");
188 check(conn.readln(), conn); // banner
190 conn.println("EHLO " + conn.vhost);
191 check(conn.readln(), conn);
192 } catch (SMTPException smtpe) {
193 conn.println("HELO " + conn.vhost);
194 check(conn.readln(), conn);
196 if (m.envelopeFrom==null) {
197 conn.println("MAIL FROM:<>"); check(conn.readln(), conn);
199 conn.println("MAIL FROM:<" + m.envelopeFrom.user + "@" + m.envelopeFrom.host+">"); check(conn.readln(), conn);
201 conn.println("RCPT TO:<" + m.envelopeTo.user + "@" + m.envelopeTo.host+">"); check(conn.readln(), conn);
202 conn.println("DATA"); check(conn.readln(), conn);
203 Stream stream = m.getStream();
204 boolean inheaders = true;
206 String s = stream.readln();
207 if (s == null) break;
208 if (s.length() == 0) inheaders = false;
209 // quash Return-Path; required by RFC2822
210 if (inheaders && s.toLowerCase().startsWith("Return-Path:")) continue;
211 if (s.startsWith(".")) conn.print(".");
215 check(conn.readln(), conn);
216 Log.warn(SMTP.Outgoing.class, "success: " + mx + " accepted " + m.summary());
219 } catch (Exception e) {
220 if (accepted) return true;
221 Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
222 Log.warn(SMTP.Outgoing.class, " message: " + m.summary());
223 Log.warn(SMTP.Outgoing.class, e);
226 if (conn != null) conn.close();
233 Log.setThreadAnnotation("[outgoing smtp] ");
234 Log.info(SMTP.Outgoing.class, "outgoing thread started; " + spool.count(Query.all()) + " messages to send");
236 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
237 for(Mailbox.Iterator it = spool.iterator(); it.next(); ) {
239 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
240 if (attempt(it.cur())) it.delete();
241 } catch (Exception e) {
242 if (e instanceof InterruptedException) throw e;
243 Log.error(SMTP.Outgoing.class, e);
246 synchronized(Outgoing.class) {
247 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
248 Log.info(SMTP.Outgoing.class, "outgoing thread going to sleep");
249 Outgoing.class.wait(5 * 60 * 1000);
251 Log.info(SMTP.Outgoing.class,"outgoing thread woke up; "+spool.count(Query.all())+" messages in queue");
254 } catch (Exception e) {
255 Log.error(SMTP.Outgoing.class, "outgoing thread killed by exception: " + e);
256 Log.error(SMTP.Outgoing.class, e);
261 public static InetAddress[] getMailExchangerIPs(String hostName) {
264 Hashtable env = new Hashtable();
265 env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
266 DirContext ictx = new InitialDirContext(env);
267 Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });
268 Attribute attr = attrs.get("MX");
270 ret = new InetAddress[1];
272 ret[0] = InetAddress.getByName(hostName);
274 } catch (UnknownHostException uhe) {
275 Log.warn(SMTP.class, "no MX hosts or A record for " + hostName);
276 return new InetAddress[0];
279 ret = new InetAddress[attr.size()];
280 NamingEnumeration ne = attr.getAll();
281 for(int i=0; ne.hasMore(); i++) {
282 String mx = (String)ne.next();
283 // FIXME we should be sorting here
284 mx = mx.substring(mx.indexOf(" ") + 1);
285 if (mx.charAt(mx.length() - 1) == '.') mx = mx.substring(0, mx.length() - 1);
286 ret[i] = InetAddress.getByName(mx);
289 } catch (Exception e) {
290 Log.warn(SMTP.class, "couldn't find MX host for " + hostName + " due to");
291 Log.warn(SMTP.class, e);
292 return new InetAddress[0];