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 // FIXME: bounce messages (must go to return-path unless empty, in which case do not send
15 // FIXME: if more than 100 "Received" lines, must drop message
16 // FEATURE: infer messageid, date, if not present (?)
17 // FEATURE: RFC2822, section 4.5.1: special "postmaster" address
18 // FEATURE: RFC2822, section 4.5.4.1: retry strategies
19 // FEATURE: RFC2822, section 5, multiple MX records, preferences, ordering
20 // FEATURE: exponential backoff on retry time?
21 // FEATURE: RFC2822, end of 4.1.2: backslashes in headers
24 public static final SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z");
25 private static final Mailbox spool =
26 FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
28 static { new Thread() { public void run() { Outgoing.runq(); } }.start(); }
30 public static class SMTPException extends MailException {
33 public SMTPException(String s) {
34 code = Integer.parseInt(s.substring(0, s.indexOf(' ')));
35 message = s.substring(s.indexOf(' ')+1);
37 public String toString() { return "SMTP " + code + ": " + message; }
38 public String getMessage() { return toString(); }
41 // Server //////////////////////////////////////////////////////////////////////////////
43 public static class Server implements Worker {
44 public void handleRequest(Connection conn) {
45 conn.setTimeout(5 * 60 * 1000);
46 conn.setNewline("\r\n");
47 conn.println("220 " + conn.vhost + " SMTP " + this.getClass().getName());
49 Vector to = new Vector();
51 String remotehost = null;
52 for(String command = conn.readln(); ; command = conn.readln()) try {
53 if (command == null) return;
54 String c = command.toUpperCase();
55 if (c.startsWith("HELO")) {
56 remotehost = c.substring(5).trim();
57 conn.println("250 HELO " + conn.vhost);
58 from = null; to = new Vector();
59 } else if (c.startsWith("EHLO")) {
60 remotehost = c.substring(5).trim();
63 from = null; to = new Vector();
64 } else if (c.startsWith("RSET")) { conn.println("250 reset ok"); from = null; to = new Vector();
65 } else if (c.startsWith("HELP")) { conn.println("214 you are beyond help. see a trained professional.");
66 } else if (c.startsWith("VRFY")) { conn.println("502 VRFY not supported");
67 } else if (c.startsWith("EXPN")) { conn.println("502 EXPN not supported");
68 } else if (c.startsWith("NOOP")) { conn.println("250 OK");
69 } else if (c.startsWith("QUIT")) { conn.println("221 " + conn.vhost + " closing connection"); return;
70 } else if (c.startsWith("MAIL FROM:")) {
71 command = command.substring(10).trim();
72 from = command.equals("<>") ? null : new Address(command);
73 conn.println("250 " + from + " is syntactically correct");
74 } else if (c.startsWith("RCPT TO:")) {
75 // some clients are broken and put RCPT first; we will tolerate this
76 command = command.substring(8).trim();
77 if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
78 Address addr = new Address(command);
80 // FEATURE: should check the address further and give 550 if undeliverable
81 conn.println("250 " + addr + " is on this machine; I will deliver it");
82 } else if (conn.getRemoteAddress().isLoopbackAddress())
83 conn.println("250 you are connected locally, so I will let you send");
84 else { conn.println("551 sorry, " + addr + " is not on this machine"); }
86 } else if (c.startsWith("DATA")) {
87 if (from == null) { conn.println("503 MAIL FROM command must precede DATA"); continue; }
88 if (to == null) { conn.println("503 RCPT TO command must precede DATA"); continue; }
89 conn.println("354 Enter message, ending with \".\" on a line by itself");
92 StringBuffer buf = new StringBuffer();
93 buf.append("Received: from " + conn.getRemoteHostname() + " (" + remotehost + ")\r\n");
94 buf.append(" by "+conn.vhost+" ("+SMTP.class.getName()+") with "+(ehlo?"ESMTP":"SMTP") + "\r\n");
95 buf.append(" for "); for(int i=0; i<to.size(); i++) buf.append(to.elementAt(i) + " ");
96 buf.append("; " + dateFormat.format(new Date()) + "\r\n");
98 String s = conn.readln();
99 if (s == null) throw new RuntimeException("connection closed");
100 if (s.equals(".")) break;
101 if (s.startsWith(".")) s = s.substring(1);
102 buf.append(s + "\r\n");
104 String body = buf.toString();
106 for(int i=0; i<to.size(); i++) {
107 m = Message.newMessage(new Stream(body), from, (Address)to.elementAt(i));
108 if (!m.envelopeTo.isLocal()) Outgoing.accept(m);
109 else Target.root.accept(m);
111 if (m != null) Log.info(SMTP.class, "accepted message: " + m.summary());
112 conn.println("250 message accepted");
114 from = null; to = new Vector();
115 } catch (MailException.Malformed mfe) { conn.println("501 " + mfe.toString());
116 } catch (MailException.MailboxFull mbf) { conn.println("452 " + mbf);
117 } catch (IOException ioe) {
118 //conn.println("554 " + ioe.toString());
119 Log.error(this, ioe);
123 } else { conn.println("500 unrecognized command"); }
124 } catch (Message.Malformed e) { conn.println("501 " + e.toString()); }
129 // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
131 public static class Outgoing {
133 private static final HashSet deadHosts = new HashSet();
134 public static void accept(Message m) throws IOException {
135 if (m == null) { Log.warn(Outgoing.class, "attempted to accept(null)"); return; }
136 //Log.info(SMTP.class, "queued: " + m.summary());
138 if (m.traces.length >= 100)
139 Log.warn(SMTP.Outgoing.class, "Message with " + m.traces.length + " trace hops; dropping\n" + m.summary());
141 else synchronized(Outgoing.class) {
143 Outgoing.class.notify();
147 public static boolean attempt(Message m) throws IOException {
148 InetAddress[] mx = getMailExchangerIPs(m.envelopeTo.host);
149 if (mx.length == 0) {
150 Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelopeTo.host + "; bouncing it\n" + m.summary());
151 accept(m.bounce("could not resolve " + m.envelopeTo.host));
154 if (new Date().getTime() - m.arrival.getTime() > 1000 * 60 * 60 * 24 * 5) {
155 Log.warn(SMTP.Outgoing.class, "could not send message after 5 days; bouncing it\n" + m.summary());
156 accept(m.bounce("could not send for 5 days"));
159 for(int i=0; i<mx.length; i++) {
160 if (deadHosts.contains(mx[i])) continue;
161 if (attempt(m, mx[i])) { return true; }
166 private static void check(String s, Connection conn) {
167 while (s.length() > 3 && s.charAt(3) == '-') s = conn.readln();
168 if (s.startsWith("4")||s.startsWith("5")) throw new SMTPException(s);
170 private static boolean attempt(final Message m, final InetAddress mx) {
171 boolean accepted = false;
172 Connection conn = null;
174 Log.note("connecting to " + mx + "...");
175 conn = new Connection(new Socket(mx, 25), InetAddress.getLocalHost().getHostName());
176 conn.setNewline("\r\n");
177 conn.setTimeout(60 * 1000);
178 Log.note(" connected");
179 check(conn.readln(), conn); // banner
181 conn.println("EHLO " + conn.vhost);
182 check(conn.readln(), conn);
183 } catch (SMTPException smtpe) {
184 conn.println("HELO " + conn.vhost);
185 check(conn.readln(), conn);
187 conn.println("MAIL FROM:<" + m.envelopeFrom.user + "@" + m.envelopeFrom.host+">"); check(conn.readln(), conn);
188 conn.println("RCPT TO:<" + m.envelopeTo.user + "@" + m.envelopeTo.host+">"); check(conn.readln(), conn);
189 conn.println("DATA"); check(conn.readln(), conn);
190 Stream stream = new Stream(m.toString());
191 boolean inheaders = true;
193 String s = stream.readln();
194 if (s == null) break;
195 if (s.length() == 0) inheaders = false;
196 // quash Return-Path; required by RFC2822
197 if (inheaders && s.toLowerCase().startsWith("Return-Path:")) continue;
198 if (s.startsWith(".")) conn.print(".");
202 check(conn.readln(), conn);
203 Log.warn(SMTP.Outgoing.class, "success: " + mx + " accepted " + m.summary());
206 } catch (Exception e) {
207 if (accepted) return true;
208 Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
209 Log.warn(SMTP.Outgoing.class, e);
212 if (conn != null) conn.close();
219 Log.setThreadAnnotation("[outgoing smtp] ");
220 Log.info(SMTP.Outgoing.class, "outgoing thread started; " + spool.count(Query.all()) + " messages to send");
222 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
223 for(Mailbox.Iterator it = spool.iterator(); it.next(); ) {
225 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
226 if (attempt(it.cur())) it.delete();
227 } catch (Exception e) {
228 if (e instanceof InterruptedException) throw e;
229 Log.error(SMTP.Outgoing.class, e);
232 synchronized(Outgoing.class) {
233 if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
234 Log.info(SMTP.Outgoing.class, "outgoing thread going to sleep");
235 Outgoing.class.wait(5 * 60 * 1000);
237 Log.info(SMTP.Outgoing.class,"outgoing thread woke up; "+spool.count(Query.all())+" messages in queue");
240 } catch (Exception e) {
241 Log.error(SMTP.Outgoing.class, "outgoing thread killed by exception: " + e);
242 Log.error(SMTP.Outgoing.class, e);
247 public static InetAddress[] getMailExchangerIPs(String hostName) {
250 Hashtable env = new Hashtable();
251 env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
252 DirContext ictx = new InitialDirContext(env);
253 Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });
254 Attribute attr = attrs.get("MX");
256 ret = new InetAddress[1];
258 ret[0] = InetAddress.getByName(hostName);
260 } catch (UnknownHostException uhe) {
261 Log.warn(SMTP.class, "no MX hosts or A record for " + hostName);
262 return new InetAddress[0];
265 ret = new InetAddress[attr.size()];
266 NamingEnumeration ne = attr.getAll();
267 for(int i=0; ne.hasMore(); i++) {
268 String mx = (String)ne.next();
269 // FIXME we should be sorting here
270 mx = mx.substring(mx.indexOf(" ") + 1);
271 if (mx.charAt(mx.length() - 1) == '.') mx = mx.substring(0, mx.length() - 1);
272 ret[i] = InetAddress.getByName(mx);
275 } catch (Exception e) {
276 Log.warn(SMTP.class, "couldn't find MX host for " + hostName + " due to");
277 Log.warn(SMTP.class, e);
278 return new InetAddress[0];