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;
35 public static final int GRAYLIST_MINWAIT = 1000 * 60 * 60; // one hour
36 public static final int GRAYLIST_MAXWAIT = 1000 * 60 * 60 * 24 * 5; // five days
38 public static final Graylist graylist =
39 new Graylist(Mailbox.STORAGE_ROOT+"/graylist.sqlite");
41 public static final int MAX_MESSAGE_SIZE =
42 Integer.parseInt(System.getProperty("org.ibex.mail.smtp.maxMessageSize", "-1"));
44 private static final Mailbox spool =
45 FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
48 for(int i=0; i<numOutgoingThreads; i++)
49 new Outgoing().start();
52 public static void accept(Message m) throws IOException {
53 if (!m.envelopeTo.isLocal()) Outgoing.accept(m);
54 else Target.root.accept(m);
57 public static class SMTPException extends MailException {
60 public SMTPException(String s) {
62 code = Integer.parseInt(s.substring(0, s.indexOf(' ')));
63 message = s.substring(s.indexOf(' ')+1);
64 } catch (NumberFormatException nfe) {
69 public String toString() { return "SMTP " + code + ": " + message; }
70 public String getMessage() { return toString(); }
73 // Server //////////////////////////////////////////////////////////////////////////////
75 public static class Server {
76 public void handleRequest(Connection conn) {
77 conn.setTimeout(5 * 60 * 1000);
78 conn.setNewline("\r\n");
79 conn.println("220 " + conn.vhost + " SMTP " + this.getClass().getName());
81 Vector to = new Vector();
83 String remotehost = null;
84 for(String command = conn.readln(); ; command = conn.readln()) try {
85 if (command == null) return;
86 Log.warn("**"+conn.getRemoteAddress()+"**", command);
87 String c = command.toUpperCase();
88 if (c.startsWith("HELO")) {
89 remotehost = c.substring(5).trim();
90 conn.println("250 HELO " + conn.vhost);
91 from = null; to = new Vector();
92 } else if (c.startsWith("EHLO")) {
93 remotehost = c.substring(5).trim();
94 conn.println("250 "+conn.vhost+" greets " + remotehost);
96 from = null; to = new Vector();
97 } else if (c.startsWith("RSET")) { conn.println("250 reset ok"); from = null; to = new Vector();
98 } else if (c.startsWith("HELP")) { conn.println("214 you are beyond help. see a trained professional.");
99 } else if (c.startsWith("VRFY")) { conn.println("502 VRFY not supported");
100 } else if (c.startsWith("EXPN")) { conn.println("502 EXPN not supported");
101 } else if (c.startsWith("NOOP")) { conn.println("250 OK");
102 } else if (c.startsWith("QUIT")) { conn.println("221 " + conn.vhost + " closing connection"); return;
103 } else if (c.startsWith("MAIL FROM:")) {
104 command = command.substring(10).trim();
105 from = command.equals("<>") ? null : new Address(command);
106 conn.println("250 " + from + " is syntactically correct");
107 } else if (c.startsWith("RCPT TO:")) {
108 // some clients are broken and put RCPT first; we will tolerate this
109 command = command.substring(8).trim();
110 if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
111 Address addr = new Address(command);
113 Log.warn("**"+conn.getRemoteAddress()+"**",
114 "addr.isLocal(): " + addr.isLocal() + "\n" +
115 "conn.getRemoteAddress().isLoopbackAddress(): " + conn.getRemoteAddress().isLoopbackAddress() + "\n" +
116 "johnw: " + (from!=null&&from.toString().indexOf("johnw")!=-1) + "\n"
119 if (addr.isLocal()) {
120 // FEATURE: should check the address further and give 550 if undeliverable
121 conn.println("250 " + addr + " is on this machine; I will deliver it");
123 } else if (conn.getRemoteAddress().isLoopbackAddress() || (from!=null&&from.toString().indexOf("johnw")!=-1)) {
124 conn.println("250 you are connected locally, so I will let you send");
127 conn.println("551 sorry, " + addr + " is not on this machine");
130 } else if (c.startsWith("DATA")) {
131 //if (from == null) { conn.println("503 MAIL FROM command must precede DATA"); continue; }
132 if (to == null || to.size()==0) { conn.println("503 RCPT TO command must precede DATA"); continue; }
133 if (!graylist.isWhitelisted(conn.getRemoteAddress()) && !conn.getRemoteAddress().isLoopbackAddress()) {
134 long when = graylist.getGrayListTimestamp(conn.getRemoteAddress(), from+"", to+"");
135 if (when == 0 || System.currentTimeMillis() - when > GRAYLIST_MAXWAIT) {
136 graylist.setGrayListTimestamp(conn.getRemoteAddress(), from+"", to+"", System.currentTimeMillis());
137 conn.println("451 you are graylisted; please try back in one hour to be whitelisted");
138 Log.warn(conn.getRemoteAddress().toString(), "451 you are graylisted; please try back in one hour to be whitelisted");
141 } else if (System.currentTimeMillis() - when > GRAYLIST_MINWAIT) {
142 graylist.addWhitelist(conn.getRemoteAddress());
143 conn.println("354 (you have been whitelisted) Enter message, ending with \".\" on a line by itself");
144 Log.warn(conn.getRemoteAddress().toString(), "has been whitelisted");
146 conn.println("451 you are still graylisted (since "+new java.util.Date(when)+")");
148 Log.warn(conn.getRemoteAddress().toString(), "451 you are still graylisted (since "+new java.util.Date(when)+")");
152 conn.println("354 Enter message, ending with \".\" on a line by itself");
156 StringBuffer buf = new StringBuffer();
157 buf.append("Received: from " + conn.getRemoteHostname() + " (" + remotehost + ")\r\n");
158 buf.append(" by "+conn.vhost+" ("+SMTP.class.getName()+") with "+(ehlo?"ESMTP":"SMTP") + "\r\n");
160 // FIXME: this is leaking BCC addrs
161 // for(int i=0; i<to.size(); i++) buf.append(to.elementAt(i) + " ");
162 buf.append("; " + dateFormat.format(new Date()) + "\r\n");
164 String s = conn.readln();
165 if (s == null) throw new RuntimeException("connection closed");
166 if (s.equals(".")) break;
167 if (s.startsWith(".")) s = s.substring(1);
168 buf.append(s + "\r\n");
169 if (MAX_MESSAGE_SIZE != -1 && buf.length() > MAX_MESSAGE_SIZE) {
170 Log.error("**"+conn.getRemoteAddress()+"**",
171 "sorry, this mail server only accepts messages of less than " +
172 ByteSize.toString(MAX_MESSAGE_SIZE));
173 throw new MailException.Malformed("sorry, this mail server only accepts messages of less than " +
174 ByteSize.toString(MAX_MESSAGE_SIZE));
177 String body = buf.toString();
179 for(int i=0; i<to.size(); i++) {
180 m = Message.newMessage(new Fountain.StringFountain(body), from, (Address)to.elementAt(i));
183 if (m != null) Log.info(SMTP.class, "accepted message: " + m.summary());
184 conn.println("250 message accepted");
186 from = null; to = new Vector();
187 } catch (Reject.RejectException re) {
188 Log.warn(SMTP.class, "rejecting message due to: " + re.reason + "\n " + re.m.summary());
189 conn.println("501 " + re.reason);
190 } catch (MailException.Malformed mfe) { conn.println("501 " + mfe.toString());
191 } catch (MailException.MailboxFull mbf) { conn.println("452 " + mbf);
192 } catch (Later.LaterException le) { conn.println("453 try again later");
193 } catch (IOException ioe) {
194 //conn.println("554 " + ioe.toString());
195 Log.error(this, ioe);
199 } else { conn.println("500 unrecognized command"); }
200 } catch (Message.Malformed e) { conn.println("501 " + e.toString()); }
205 // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
207 public static class Outgoing extends Thread {
209 private static final HashMap deadHosts = new HashMap();
210 public static void accept(Message m) throws IOException {
211 if (m == null) { Log.warn(Outgoing.class, "attempted to accept(null)"); return; }
212 String traces = m.headers.get("Received");
215 for(int i=0; i<traces.length(); i++)
216 if (traces.charAt(i)=='\n' || traces.charAt(i)=='\r')
218 if (lines > 100) { // required by rfc
219 Log.warn(SMTP.Outgoing.class, "Message with " + lines + " trace hops; dropping\n" + m.summary());
223 synchronized(Outgoing.class) {
225 Outgoing.class.notifyAll();
229 public static boolean attempt(Message m) throws IOException { return attempt(m, false); }
230 public static boolean attempt(Message m, boolean noBounces) throws IOException {
231 if (m.envelopeTo == null) {
232 Log.warn(SMTP.Outgoing.class, "aieeee, null envelopeTo: " + m.summary());
235 InetAddress[] mx = getMailExchangerIPs(m.envelopeTo.host);
236 if (mx.length == 0) {
238 accept(m.bounce("could not resolve " + m.envelopeTo.host));
241 Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelopeTo.host);
245 if (new Date().getTime() - m.arrival.getTime() > 1000 * 60 * 60 * 24 * 5) {
247 accept(m.bounce("could not send for 5 days"));
250 Log.warn(SMTP.Outgoing.class, "could not send for 5 days: " + m.summary());
254 for(int i=0; i<mx.length; i++) {
255 //if (deadHosts.contains(mx[i])) continue;
256 if (attempt(m, mx[i])) { return true; }
261 private static void check(String s, Connection conn) {
263 while (s.length() > 3 && s.charAt(3) == '-') s = conn.readln();
264 if (s.startsWith("4")||s.startsWith("5")) throw new SMTPException(s);
266 private static boolean attempt(final Message m, final InetAddress mx) {
267 boolean accepted = false;
268 Connection conn = null;
270 Log.note("connecting to " + mx + "...");
271 conn = new Connection(new Socket(mx, 25), InetAddress.getLocalHost().getHostName());
272 conn.setNewline("\r\n");
273 conn.setTimeout(60 * 1000);
274 Log.note(" connected");
275 check(conn.readln(), conn); // banner
277 conn.println("EHLO " + conn.vhost);
278 check(conn.readln(), conn);
279 } catch (SMTPException smtpe) {
280 conn.println("HELO " + conn.vhost);
281 check(conn.readln(), conn);
283 if (m.envelopeFrom==null) {
284 Log.warn("", "MAIL FROM:<>");
285 conn.println("MAIL FROM:<>"); check(conn.readln(), conn);
287 Log.warn("", "MAIL FROM:<" + m.envelopeFrom.toString()+">");
288 conn.println("MAIL FROM:<" + m.envelopeFrom.toString()+">"); check(conn.readln(), conn);
290 conn.println("RCPT TO:<" + m.envelopeTo.toString()+">"); check(conn.readln(), conn);
291 conn.println("DATA"); check(conn.readln(), conn);
292 Headers head = m.headers;
293 head = head.remove("return-path");
294 head = head.remove("bcc");
295 Stream stream = head.getStream();
296 for(String s = stream.readln(); s!=null; s=stream.readln()) {
297 if (s.startsWith(".")) conn.print(".");
301 stream = m.getBody().getStream();
302 for(String s = stream.readln(); s!=null; s=stream.readln()) {
303 if (s.startsWith(".")) conn.print(".");
307 String resp = conn.readln();
309 throw new SMTPException("server " + mx + " closed connection without accepting message");
311 Log.warn(SMTP.Outgoing.class, "success: " + mx + " accepted " + m.summary() + "\n["+resp+"]");
314 } catch (SMTPException e) {
315 if (accepted) return true;
316 Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
317 Log.warn(SMTP.Outgoing.class, " message: " + m.summary());
318 Log.warn(SMTP.Outgoing.class, e);
319 if (e.code >= 500 && e.code <= 599) {
321 attempt(m.bounce("unable to deliver: " + e), true);
322 } catch (Exception ex) {
323 Log.error(SMTP.Outgoing.class, "exception while trying to deliver bounce; giving up completely");
324 Log.error(SMTP.Outgoing.class, ex);
329 } catch (Exception e) {
330 if (accepted) return true;
331 Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
332 Log.warn(SMTP.Outgoing.class, " message: " + m.summary());
333 Log.warn(SMTP.Outgoing.class, e);
334 if (conn != null) Log.warn(SMTP.Outgoing.class, conn.dumpLog());
337 if (conn != null) conn.close();
342 private static HashSet<Outgoing> threads = new HashSet<Outgoing>();
343 private static int serials = 1;
344 private int serial = serials++;
345 private Mailbox.Iterator it;
348 synchronized(Outgoing.class) {
354 int count = spool.count(Query.all());
355 Log.info(SMTP.Outgoing.class, "outgoing thread #"+serial+" woke up; " + count + " messages to send");
358 boolean good = false;
359 synchronized(Outgoing.class) {
360 it = spool.iterator();
361 OUTER: for(; it.next(); ) {
362 for(Outgoing o : threads)
363 if (o!=this && o.it != null && o.it.uid()==it.uid())
371 if (attempt(it.cur())) it.delete();
372 } catch (Exception e) {
373 Log.error(SMTP.Outgoing.class, e);
375 Log.info(this, "sleeping for 3s...");
378 } catch (Exception e) {
379 //if (e instanceof InterruptedException) throw e;
380 Log.error(SMTP.Outgoing.class, e);
382 Log.info(SMTP.Outgoing.class, "outgoing thread #"+serial+" going back to sleep");
389 Log.setThreadAnnotation("[outgoing #"+serial+"] ");
392 synchronized(Outgoing.class) {
393 Outgoing.class.wait(5 * 60 * 1000);
396 } catch (InterruptedException e) { Log.warn(this, e); }
400 public static InetAddress[] getMailExchangerIPs(String hostName) {
403 Hashtable env = new Hashtable();
404 env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
405 DirContext ictx = new InitialDirContext(env);
406 Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });
407 Attribute attr = attrs.get("MX");
409 ret = new InetAddress[1];
411 ret[0] = InetAddress.getByName(hostName);
412 if (ret[0].equals(IP.getIP(127,0,0,1)) || ret[0].isLoopbackAddress()) throw new UnknownHostException();
414 } catch (UnknownHostException uhe) {
415 Log.warn(SMTP.class, "no MX hosts or A record for " + hostName);
416 return new InetAddress[0];
419 ret = new InetAddress[attr.size()];
420 NamingEnumeration ne = attr.getAll();
421 for(int i=0; ne.hasMore();) {
422 String mx = (String)ne.next();
423 // FIXME we should be sorting here
424 mx = mx.substring(mx.indexOf(" ") + 1);
425 if (mx.charAt(mx.length() - 1) == '.') mx = mx.substring(0, mx.length() - 1);
426 InetAddress ia = InetAddress.getByName(mx);
427 if (ia.equals(IP.getIP(127,0,0,1)) || ia.isLoopbackAddress()) continue;
431 } catch (Exception e) {
432 Log.warn(SMTP.class, "couldn't find MX host for " + hostName + " due to");
433 Log.warn(SMTP.class, e);
434 return new InetAddress[0];