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.util.*;
15 import javax.naming.*;
16 import javax.naming.directory.*;
18 // FIXME: logging: current logging sucks
19 // FIXME: loop prevention
20 // FIXME: probably need some throttling on outbound mail
24 // FEATURE: infer messageid, date, if not present (?)
25 // FEATURE: exponential backoff on retry time?
26 // FEATURE: RFC2822, section 4.5.1: special "postmaster" address
27 // FEATURE: RFC2822, section 4.5.4.1: retry strategies
28 // FEATURE: RFC2822, section 5, multiple MX records, preferences, ordering
29 // FEATURE: RFC2822, end of 4.1.2: backslashes in headers
32 public static final SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z");
33 public static final int numOutgoingThreads = 5;
34 private static final Mailbox spool =
35 FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
38 for(int i=0; i<numOutgoingThreads; i++)
39 new Outgoing().start();
42 public static void accept(Message m) throws IOException {
43 if (!m.envelopeTo.isLocal()) Outgoing.accept(m);
44 else Target.root.accept(m);
47 public static class SMTPException extends MailException {
50 public SMTPException(String s) {
52 code = Integer.parseInt(s.substring(0, s.indexOf(' ')));
53 message = s.substring(s.indexOf(' ')+1);
54 } catch (NumberFormatException nfe) {
59 public String toString() { return "SMTP " + code + ": " + message; }
60 public String getMessage() { return toString(); }
63 // Server //////////////////////////////////////////////////////////////////////////////
65 public static class Server {
66 public void handleRequest(Connection conn) {
67 conn.setTimeout(5 * 60 * 1000);
68 conn.setNewline("\r\n");
69 conn.println("220 " + conn.vhost + " SMTP " + this.getClass().getName());
71 Vector to = new Vector();
73 String remotehost = null;
74 for(String command = conn.readln(); ; command = conn.readln()) try {
75 if (command == null) return;
76 Log.warn("**"+conn.getRemoteAddress()+"**", command);
77 String c = command.toUpperCase();
78 if (c.startsWith("HELO")) {
79 remotehost = c.substring(5).trim();
80 conn.println("250 HELO " + conn.vhost);
81 from = null; to = new Vector();
82 } else if (c.startsWith("EHLO")) {
83 remotehost = c.substring(5).trim();
84 conn.println("250 "+conn.vhost+" greets " + remotehost);
86 from = null; to = new Vector();
87 } else if (c.startsWith("RSET")) { conn.println("250 reset ok"); from = null; to = new Vector();
88 } else if (c.startsWith("HELP")) { conn.println("214 you are beyond help. see a trained professional.");
89 } else if (c.startsWith("VRFY")) { conn.println("502 VRFY not supported");
90 } else if (c.startsWith("EXPN")) { conn.println("502 EXPN not supported");
91 } else if (c.startsWith("NOOP")) { conn.println("250 OK");
92 } else if (c.startsWith("QUIT")) { conn.println("221 " + conn.vhost + " closing connection"); return;
93 } else if (c.startsWith("MAIL FROM:")) {
94 command = command.substring(10).trim();
95 from = command.equals("<>") ? null : new Address(command);
96 conn.println("250 " + from + " is syntactically correct");
97 } else if (c.startsWith("RCPT TO:")) {
98 // some clients are broken and put RCPT first; we will tolerate this
99 command = command.substring(8).trim();
100 if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
101 Address addr = new Address(command);
103 Log.warn("**"+conn.getRemoteAddress()+"**",
104 "addr.isLocal(): " + addr.isLocal() + "\n" +
105 "conn.getRemoteAddress().isLoopbackAddress(): " + conn.getRemoteAddress().isLoopbackAddress() + "\n" +
106 "johnw: " + (from!=null&&from.toString().indexOf("johnw")!=-1) + "\n"
109 if (addr.isLocal()) {
110 // FEATURE: should check the address further and give 550 if undeliverable
111 conn.println("250 " + addr + " is on this machine; I will deliver it");
113 } else if (conn.getRemoteAddress().isLoopbackAddress() || (from!=null&&from.toString().indexOf("johnw")!=-1)) {
114 conn.println("250 you are connected locally, so I will let you send");
117 conn.println("551 sorry, " + addr + " is not on this machine");
119 } else if (c.startsWith("DATA")) {
120 //if (from == null) { conn.println("503 MAIL FROM command must precede DATA"); continue; }
121 if (to == null || to.size()==0) { conn.println("503 RCPT TO command must precede DATA"); continue; }
122 conn.println("354 Enter message, ending with \".\" on a line by itself");
125 StringBuffer buf = new StringBuffer();
126 buf.append("Received: from " + conn.getRemoteHostname() + " (" + remotehost + ")\r\n");
127 buf.append(" by "+conn.vhost+" ("+SMTP.class.getName()+") with "+(ehlo?"ESMTP":"SMTP") + "\r\n");
129 // FIXME: this is leaking BCC addrs
130 // for(int i=0; i<to.size(); i++) buf.append(to.elementAt(i) + " ");
131 buf.append("; " + dateFormat.format(new Date()) + "\r\n");
133 String s = conn.readln();
134 if (s == null) throw new RuntimeException("connection closed");
135 if (s.equals(".")) break;
136 if (s.startsWith(".")) s = s.substring(1);
137 buf.append(s + "\r\n");
139 String body = buf.toString();
141 for(int i=0; i<to.size(); i++) {
142 m = Message.newMessage(new Fountain.StringFountain(body), from, (Address)to.elementAt(i));
145 if (m != null) Log.info(SMTP.class, "accepted message: " + m.summary());
146 conn.println("250 message accepted");
148 from = null; to = new Vector();
149 } catch (Reject.RejectException re) {
150 Log.warn(SMTP.class, "rejecting message due to: " + re.reason + "\n " + re.m.summary());
151 conn.println("501 " + re.reason);
152 } catch (MailException.Malformed mfe) { conn.println("501 " + mfe.toString());
153 } catch (MailException.MailboxFull mbf) { conn.println("452 " + mbf);
154 } catch (Later.LaterException le) { conn.println("453 try again later");
155 } catch (IOException ioe) {
156 //conn.println("554 " + ioe.toString());
157 Log.error(this, ioe);
161 } else { conn.println("500 unrecognized command"); }
162 } catch (Message.Malformed e) { conn.println("501 " + e.toString()); }
167 // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
169 public static class Outgoing extends Thread {
171 private static final HashSet deadHosts = new HashSet();
172 public static void accept(Message m) throws IOException {
173 if (m == null) { Log.warn(Outgoing.class, "attempted to accept(null)"); return; }
174 String traces = m.headers.get("Received");
177 for(int i=0; i<traces.length(); i++)
178 if (traces.charAt(i)=='\n' || traces.charAt(i)=='\r')
180 if (lines > 100) { // required by rfc
181 Log.warn(SMTP.Outgoing.class, "Message with " + lines + " trace hops; dropping\n" + m.summary());
185 synchronized(Outgoing.class) {
187 Outgoing.class.notifyAll();
191 public static boolean attempt(Message m) throws IOException { return attempt(m, false); }
192 public static boolean attempt(Message m, boolean noBounces) throws IOException {
193 if (m.envelopeTo == null) {
194 Log.warn(SMTP.Outgoing.class, "aieeee, null envelopeTo: " + m.summary());
197 InetAddress[] mx = getMailExchangerIPs(m.envelopeTo.host);
198 if (mx.length == 0) {
200 accept(m.bounce("could not resolve " + m.envelopeTo.host));
203 Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelopeTo.host);
207 if (new Date().getTime() - m.arrival.getTime() > 1000 * 60 * 60 * 24 * 5) {
209 accept(m.bounce("could not send for 5 days"));
212 Log.warn(SMTP.Outgoing.class, "could not send for 5 days: " + m.summary());
216 for(int i=0; i<mx.length; i++) {
217 //if (deadHosts.contains(mx[i])) continue;
218 if (attempt(m, mx[i])) { return true; }
223 private static void check(String s, Connection conn) {
225 while (s.length() > 3 && s.charAt(3) == '-') s = conn.readln();
226 if (s.startsWith("4")||s.startsWith("5")) throw new SMTPException(s);
228 private static boolean attempt(final Message m, final InetAddress mx) {
229 boolean accepted = false;
230 Connection conn = null;
232 Log.note("connecting to " + mx + "...");
233 conn = new Connection(new Socket(mx, 25), InetAddress.getLocalHost().getHostName());
234 conn.setNewline("\r\n");
235 conn.setTimeout(60 * 1000);
236 Log.note(" connected");
237 check(conn.readln(), conn); // banner
239 conn.println("EHLO " + conn.vhost);
240 check(conn.readln(), conn);
241 } catch (SMTPException smtpe) {
242 conn.println("HELO " + conn.vhost);
243 check(conn.readln(), conn);
245 if (m.envelopeFrom==null) {
246 Log.warn("", "MAIL FROM:<>");
247 conn.println("MAIL FROM:<>"); check(conn.readln(), conn);
249 Log.warn("", "MAIL FROM:<" + m.envelopeFrom.toString()+">");
250 conn.println("MAIL FROM:<" + m.envelopeFrom.toString()+">"); check(conn.readln(), conn);
252 conn.println("RCPT TO:<" + m.envelopeTo.toString()+">"); check(conn.readln(), conn);
253 conn.println("DATA"); check(conn.readln(), conn);
254 Headers head = m.headers;
255 head = head.remove("return-path");
256 head = head.remove("bcc");
257 Stream stream = head.getStream();
258 for(String s = stream.readln(); s!=null; s=stream.readln()) {
259 if (s.startsWith(".")) conn.print(".");
263 stream = m.getBody().getStream();
264 for(String s = stream.readln(); s!=null; s=stream.readln()) {
265 if (s.startsWith(".")) conn.print(".");
269 String resp = conn.readln();
271 throw new SMTPException("server " + mx + " closed connection without accepting message");
273 Log.warn(SMTP.Outgoing.class, "success: " + mx + " accepted " + m.summary() + "\n["+resp+"]");
276 } catch (SMTPException e) {
277 if (accepted) return true;
278 Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
279 Log.warn(SMTP.Outgoing.class, " message: " + m.summary());
280 Log.warn(SMTP.Outgoing.class, e);
281 if (e.code >= 500 && e.code <= 599) {
283 attempt(m.bounce("unable to deliver: " + e), true);
284 } catch (Exception ex) {
285 Log.error(SMTP.Outgoing.class, "exception while trying to deliver bounce; giving up completely");
286 Log.error(SMTP.Outgoing.class, ex);
291 } catch (Exception e) {
292 if (accepted) return true;
293 Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
294 Log.warn(SMTP.Outgoing.class, " message: " + m.summary());
295 Log.warn(SMTP.Outgoing.class, e);
296 if (conn != null) Log.warn(SMTP.Outgoing.class, conn.dumpLog());
299 if (conn != null) conn.close();
304 private static HashSet<Outgoing> threads = new HashSet<Outgoing>();
305 private static int serials = 1;
306 private int serial = serials++;
307 private Mailbox.Iterator it;
310 synchronized(Outgoing.class) {
316 int count = spool.count(Query.all());
317 Log.info(SMTP.Outgoing.class, "outgoing thread #"+serial+" woke up; " + count + " messages to send");
320 boolean good = false;
321 synchronized(Outgoing.class) {
322 it = spool.iterator();
323 OUTER: for(; it.next(); ) {
324 for(Outgoing o : threads)
325 if (o!=this && o.it != null && o.it.uid()==it.uid())
333 if (attempt(it.cur())) it.delete();
334 } catch (Exception e) {
335 Log.error(SMTP.Outgoing.class, e);
337 Log.info(this, "sleeping for 3s...");
340 } catch (Exception e) {
341 //if (e instanceof InterruptedException) throw e;
342 Log.error(SMTP.Outgoing.class, e);
344 Log.info(SMTP.Outgoing.class, "outgoing thread #"+serial+" going back to sleep");
351 Log.setThreadAnnotation("[outgoing #"+serial+"] ");
354 synchronized(Outgoing.class) {
355 Outgoing.class.wait(5 * 60 * 1000);
358 } catch (InterruptedException e) { Log.warn(this, e); }
362 public static InetAddress[] getMailExchangerIPs(String hostName) {
365 Hashtable env = new Hashtable();
366 env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
367 DirContext ictx = new InitialDirContext(env);
368 Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });
369 Attribute attr = attrs.get("MX");
371 ret = new InetAddress[1];
373 ret[0] = InetAddress.getByName(hostName);
374 if (ret[0].equals(IP.getIP(127,0,0,1)) || ret[0].isLoopbackAddress()) throw new UnknownHostException();
376 } catch (UnknownHostException uhe) {
377 Log.warn(SMTP.class, "no MX hosts or A record for " + hostName);
378 return new InetAddress[0];
381 ret = new InetAddress[attr.size()];
382 NamingEnumeration ne = attr.getAll();
383 for(int i=0; ne.hasMore();) {
384 String mx = (String)ne.next();
385 // FIXME we should be sorting here
386 mx = mx.substring(mx.indexOf(" ") + 1);
387 if (mx.charAt(mx.length() - 1) == '.') mx = mx.substring(0, mx.length() - 1);
388 InetAddress ia = InetAddress.getByName(mx);
389 if (ia.equals(IP.getIP(127,0,0,1)) || ia.isLoopbackAddress()) continue;
393 } catch (Exception e) {
394 Log.warn(SMTP.class, "couldn't find MX host for " + hostName + " due to");
395 Log.warn(SMTP.class, e);
396 return new InetAddress[0];