+// Copyright 2000-2005 the Contributors, as shown in the revision logs.
+// Licensed under the Apache Public Source License 2.0 ("the License").
+// You may not use this file except in compliance with the License.
+
package org.ibex.mail.protocol;
import org.ibex.mail.*;
-import org.ibex.mail.store.*;
import org.ibex.mail.target.*;
import org.ibex.util.*;
+import org.ibex.net.*;
+import org.ibex.io.*;
import java.net.*;
import java.io.*;
import java.util.*;
+import java.text.*;
+import javax.naming.*;
+import javax.naming.directory.*;
-public class SMTP extends MessageProtocol {
-
- public SMTP() {/* setProtocolName("SMTP"); */}
- //public ServerRequest createRequest(Connection conn) { return new Listener((TcpConnection)conn); }
-
- public static class Outgoing {
- // recommended retry interval is 30 minutes
- // give up after 4-5 days
- // should keep per-host success/failure so we don't retry on every message
- // exponential backoff on retry time?
- // check DNS resolvability as soon as domain is provided
- // only use implicit A-record if there are no MX-records
- // use null-sender for error messages (don't send errors to the null addr)
- // to prevent mail loops, drop messages with >100 Recieved headers
- private final org.ibex.util.Queue queue = new org.ibex.util.Queue(100);
- public static void send(Message m) { }
- public static void enqueue(Message m) { }
- public static void bounce(Message m, String reason) { }
- private void runq() {
- /*
- MessageStore store = MessageStore.root.slash("smtp").slash("outgoing");
- int[] outgoing = store.list();
- for(int i=0; i<outgoing.length; i++) queue.append(store.get(outgoing[i]));
- while(true) {
- Message next = queue.remove(true);
- // FIXME
- }
- */
- }
- }
+// FIXME: better delivery cycle attempt algorithm; current one sucks
+// FIXME: logging: current logging sucks
+// FIXME: loop prevention
- private class Listener extends Incoming /*implements ServerRequest*/ {
- //TcpConnection conn;
- Socket conn;
- //public Listener(TcpConnection conn) { this.conn = conn; conn.getSocket().setSoTimeout(5 * 60 * 1000); }
- public Listener(Socket conn) throws IOException { this.conn = conn; conn.setSoTimeout(5 * 60 * 1000); }
- public void init() { }
+// graylisting?
- public boolean handleRequest() throws IOException {
- //ReadStream rs = conn.getReadStream();
- //WriteStream ws = conn.getWriteStream();
- BufferedReader rs = new BufferedReader(new InputStreamReader(conn.getInputStream()));
- PrintWriter ws = new PrintWriter(new OutputStreamWriter(conn.getOutputStream()));
+// FEATURE: infer messageid, date, if not present (?)
+// FEATURE: exponential backoff on retry time?
+// FEATURE: RFC2822, section 4.5.1: special "postmaster" address
+// FEATURE: RFC2822, section 4.5.4.1: retry strategies
+// FEATURE: RFC2822, section 5, multiple MX records, preferences, ordering
+// FEATURE: RFC2822, end of 4.1.2: backslashes in headers
+public class SMTP {
- // FIXME
- //ws.setNewLineString("\r\n");
+ public static final SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z");
+ public static final int numOutgoingThreads = 5;
+ private static final Mailbox spool =
+ FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
- ws.println("220 " + /*conn.getVirtualHost()*/ "megacz.com" + " ESMTP " + this.getClass().getName());
+ static {
+ for(int i=0; i<numOutgoingThreads; i++)
+ new Outgoing().start();
+ }
+
+ public static void accept(Message m) throws IOException {
+ if (!m.envelopeTo.isLocal()) Outgoing.accept(m);
+ else Target.root.accept(m);
+ }
- Message.Address from = null;
+ public static class SMTPException extends MailException {
+ int code;
+ String message;
+ public SMTPException(String s) {
+ try {
+ code = Integer.parseInt(s.substring(0, s.indexOf(' ')));
+ message = s.substring(s.indexOf(' ')+1);
+ } catch (NumberFormatException nfe) {
+ code = -1;
+ message = s;
+ }
+ }
+ public String toString() { return "SMTP " + code + ": " + message; }
+ public String getMessage() { return toString(); }
+ }
+
+ // Server //////////////////////////////////////////////////////////////////////////////
+
+ public static class Server {
+ public void handleRequest(Connection conn) {
+ conn.setTimeout(5 * 60 * 1000);
+ conn.setNewline("\r\n");
+ conn.println("220 " + conn.vhost + " SMTP " + this.getClass().getName());
+ Address from = null;
Vector to = new Vector();
- // 551 = no, i won't forward that
- // 452 = mailbox full
- // see 4.4 for trace info
- while(true) {
- String command = rs.readLine();
- // FIXME: validate the HELO domain argument
- // (double check against other end of connection? must not reject though)
- if (command.toUpperCase().startsWith("HELO")) {
- ws.println("250 HELO " + /*conn.getVirtualHost()*/("megacz.com"));
- from = null;
- to = new Vector();
-
- } else if (command.toUpperCase().startsWith("EHLO")) {
- ws.println("250-" + /*conn.getVirtualHost()*/("megacz.com"));
- ws.println("250-SIZE");
- ws.println("250 PIPELINING");
- from = null;
- to = new Vector();
-
- } else if (command.toUpperCase().startsWith("RSET")) {
- from = null;
- to = new Vector();
- ws.println("250 reset ok");
-
- } else if (command.toUpperCase().startsWith("MAIL FROM:")) {
+ boolean ehlo = false;
+ String remotehost = null;
+ for(String command = conn.readln(); ; command = conn.readln()) try {
+ if (command == null) return;
+ Log.warn(conn.getRemoteAddress()+"", command);
+ String c = command.toUpperCase();
+ if (c.startsWith("HELO")) {
+ remotehost = c.substring(5).trim();
+ conn.println("250 HELO " + conn.vhost);
+ from = null; to = new Vector();
+ } else if (c.startsWith("EHLO")) {
+ remotehost = c.substring(5).trim();
+ conn.println("250 "+conn.vhost+" greets " + remotehost);
+ ehlo = true;
+ from = null; to = new Vector();
+ } else if (c.startsWith("RSET")) { conn.println("250 reset ok"); from = null; to = new Vector();
+ } else if (c.startsWith("HELP")) { conn.println("214 you are beyond help. see a trained professional.");
+ } else if (c.startsWith("VRFY")) { conn.println("502 VRFY not supported");
+ } else if (c.startsWith("EXPN")) { conn.println("502 EXPN not supported");
+ } else if (c.startsWith("NOOP")) { conn.println("250 OK");
+ } else if (c.startsWith("QUIT")) { conn.println("221 " + conn.vhost + " closing connection"); return;
+ } else if (c.startsWith("MAIL FROM:")) {
command = command.substring(10).trim();
+ from = command.equals("<>") ? null : new Address(command);
+ conn.println("250 " + from + " is syntactically correct");
+ } else if (c.startsWith("RCPT TO:")) {
+ // some clients are broken and put RCPT first; we will tolerate this
+ command = command.substring(8).trim();
if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
- from = new Message.Address(command);
-
- } else if (command.toUpperCase().startsWith("RCPT TO:")) {
- if (from == null) {
- ws.println("503 MAIL FROM must precede RCPT TO");
- continue;
+ Address addr = new Address(command);
+ if (addr.isLocal()) {
+ // FEATURE: should check the address further and give 550 if undeliverable
+ conn.println("250 " + addr + " is on this machine; I will deliver it");
+ to.addElement(addr);
+ } else if (conn.getRemoteAddress().isLoopbackAddress()) {
+ conn.println("250 you are connected locally, so I will let you send");
+ to.addElement(addr);
+ } else {
+ conn.println("551 sorry, " + addr + " is not on this machine");
}
- command = command.substring(10).trim();
- if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
- to.addElement(new Message.Address(command));
-
- } else if (command.toUpperCase().startsWith("DATA")) {
- if (from == null) { ws.println("503 MAIL FROM command must precede DATA"); continue; }
- if (to == null) { ws.println("503 RCPT TO command must precede DATA"); continue; }
- ws.println("354 Enter message, ending with \".\" on a line by itself");
- StringBuffer data = new StringBuffer();
- // move this into the Message class
- boolean good = false;
+ } else if (c.startsWith("DATA")) {
+ //if (from == null) { conn.println("503 MAIL FROM command must precede DATA"); continue; }
+ if (to == null || to.size()==0) { conn.println("503 RCPT TO command must precede DATA"); continue; }
+ conn.println("354 Enter message, ending with \".\" on a line by itself");
+ conn.flush();
try {
- good = true;
- Message m = new Message(rs, true);
- accept(m);
- } finally {
- //ws.println("251 user not local; will forward");
- if (good) ws.println("250 OK message accepted for delivery");
- else { /* FIXME */ }
+ StringBuffer buf = new StringBuffer();
+ buf.append("Received: from " + conn.getRemoteHostname() + " (" + remotehost + ")\r\n");
+ buf.append(" by "+conn.vhost+" ("+SMTP.class.getName()+") with "+(ehlo?"ESMTP":"SMTP") + "\r\n");
+ buf.append(" for ");
+ // FIXME: this is leaking BCC addrs
+ // for(int i=0; i<to.size(); i++) buf.append(to.elementAt(i) + " ");
+ buf.append("; " + dateFormat.format(new Date()) + "\r\n");
+ while(true) {
+ String s = conn.readln();
+ if (s == null) throw new RuntimeException("connection closed");
+ if (s.equals(".")) break;
+ if (s.startsWith(".")) s = s.substring(1);
+ buf.append(s + "\r\n");
+ }
+ String body = buf.toString();
+ Message m = null;
+ for(int i=0; i<to.size(); i++) {
+ m = Message.newMessage(new Fountain.StringFountain(body), from, (Address)to.elementAt(i));
+ accept(m);
+ }
+ if (m != null) Log.info(SMTP.class, "accepted message: " + m.summary());
+ conn.println("250 message accepted");
+ conn.flush();
+ from = null; to = new Vector();
+ } catch (MailException.Malformed mfe) { conn.println("501 " + mfe.toString());
+ } catch (MailException.MailboxFull mbf) { conn.println("452 " + mbf);
+ } catch (Later.LaterException le) { conn.println("453 try again later");
+ } catch (IOException ioe) {
+ //conn.println("554 " + ioe.toString());
+ Log.error(this, ioe);
+ conn.close();
+ return;
}
-
- } else if (command.toUpperCase().startsWith("HELP")) {
- ws.println("214 sorry, you are beyond help. please see a trained professional.");
+ } else { conn.println("500 unrecognized command"); }
+ } catch (Message.Malformed e) { conn.println("501 " + e.toString()); }
+ }
+ }
+
- } else if (command.toUpperCase().startsWith("VRFY")) { // FIXME, see code 252
- } else if (command.toUpperCase().startsWith("EXPN")) { ws.println("550 EXPN not available");
- } else if (command.toUpperCase().startsWith("NOOP")) { ws.println("250 OK");
- } else if (command.toUpperCase().startsWith("QUIT")) {
- ws.println("221 " + /*conn.getVirtualHost()*/("megacz.com") + " closing connection");
- break;
+ // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
+ public static class Outgoing extends Thread {
+
+ private static final HashSet deadHosts = new HashSet();
+ public static void accept(Message m) throws IOException {
+ if (m == null) { Log.warn(Outgoing.class, "attempted to accept(null)"); return; }
+ String traces = m.headers.get("Received");
+ if (traces!=null) {
+ int lines = 0;
+ for(int i=0; i<traces.length(); i++)
+ if (traces.charAt(i)=='\n' || traces.charAt(i)=='\r')
+ lines++;
+ if (lines > 100) { // required by rfc
+ Log.warn(SMTP.Outgoing.class, "Message with " + lines + " trace hops; dropping\n" + m.summary());
+ return;
+ }
+ }
+ synchronized(Outgoing.class) {
+ spool.add(m);
+ Outgoing.class.notifyAll();
+ }
+ }
+
+ public static boolean attempt(Message m) throws IOException { return attempt(m, false); }
+ public static boolean attempt(Message m, boolean noBounces) throws IOException {
+ if (m.envelopeTo == null) {
+ Log.warn(SMTP.Outgoing.class, "aieeee, null envelopeTo: " + m.summary());
+ return false;
+ }
+ InetAddress[] mx = getMailExchangerIPs(m.envelopeTo.host);
+ if (mx.length == 0) {
+ if (!noBounces) {
+ accept(m.bounce("could not resolve " + m.envelopeTo.host));
+ return true;
+ } else {
+ Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelopeTo.host);
+ return false;
+ }
+ }
+ if (new Date().getTime() - m.arrival.getTime() > 1000 * 60 * 60 * 24 * 5) {
+ if (!noBounces) {
+ accept(m.bounce("could not send for 5 days"));
+ return true;
+ } else {
+ Log.warn(SMTP.Outgoing.class, "could not send for 5 days: " + m.summary());
+ return false;
+ }
+ }
+ for(int i=0; i<mx.length; i++) {
+ //if (deadHosts.contains(mx[i])) continue;
+ if (attempt(m, mx[i])) { return true; }
+ }
+ return false;
+ }
+
+ private static void check(String s, Connection conn) {
+ if (s==null) return;
+ while (s.length() > 3 && s.charAt(3) == '-') s = conn.readln();
+ if (s.startsWith("4")||s.startsWith("5")) throw new SMTPException(s);
+ }
+ private static boolean attempt(final Message m, final InetAddress mx) {
+ boolean accepted = false;
+ Connection conn = null;
+ try {
+ Log.note("connecting to " + mx + "...");
+ conn = new Connection(new Socket(mx, 25), InetAddress.getLocalHost().getHostName());
+ conn.setNewline("\r\n");
+ conn.setTimeout(60 * 1000);
+ Log.note(" connected");
+ check(conn.readln(), conn); // banner
+ try {
+ conn.println("EHLO " + conn.vhost);
+ check(conn.readln(), conn);
+ } catch (SMTPException smtpe) {
+ conn.println("HELO " + conn.vhost);
+ check(conn.readln(), conn);
+ }
+ if (m.envelopeFrom==null) {
+ Log.warn("", "MAIL FROM:<>");
+ conn.println("MAIL FROM:<>"); check(conn.readln(), conn);
} else {
- ws.println("500 unrecognized command");
- }
-
+ Log.warn("", "MAIL FROM:<" + m.envelopeFrom.toString()+">");
+ conn.println("MAIL FROM:<" + m.envelopeFrom.toString()+">"); check(conn.readln(), conn);
+ }
+ conn.println("RCPT TO:<" + m.envelopeTo.toString()+">"); check(conn.readln(), conn);
+ conn.println("DATA"); check(conn.readln(), conn);
+ Headers head = m.headers;
+ head.remove("return-path");
+ head.remove("bcc");
+ Stream stream = head.getStream();
+ for(String s = stream.readln(); s!=null; s=stream.readln()) {
+ if (s.startsWith(".")) conn.print(".");
+ conn.println(s);
+ }
+ conn.println("");
+ stream = m.getBody().getStream();
+ for(String s = stream.readln(); s!=null; s=stream.readln()) {
+ if (s.startsWith(".")) conn.print(".");
+ conn.println(s);
+ }
+ conn.println(".");
+ String resp = conn.readln();
+ if (resp == null)
+ throw new SMTPException("server " + mx + " closed connection without accepting message");
+ check(resp, conn);
+ Log.warn(SMTP.Outgoing.class, "success: " + mx + " accepted " + m.summary() + "\n["+resp+"]");
+ accepted = true;
+ conn.close();
+ } catch (SMTPException e) {
+ if (accepted) return true;
+ Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
+ Log.warn(SMTP.Outgoing.class, " message: " + m.summary());
+ Log.warn(SMTP.Outgoing.class, e);
+ if (e.code >= 500 && e.code <= 599) {
+ try {
+ attempt(m.bounce("unable to deliver: " + e), true);
+ } catch (Exception ex) {
+ Log.error(SMTP.Outgoing.class, "exception while trying to deliver bounce; giving up completely");
+ Log.error(SMTP.Outgoing.class, ex);
+ }
+ return true;
+ }
+ return false;
+ } catch (Exception e) {
+ if (accepted) return true;
+ Log.warn(SMTP.Outgoing.class, " unable to send; error=" + e);
+ Log.warn(SMTP.Outgoing.class, " message: " + m.summary());
+ Log.warn(SMTP.Outgoing.class, e);
+ if (conn != null) Log.warn(SMTP.Outgoing.class, conn.dumpLog());
+ return false;
+ } finally {
+ if (conn != null) conn.close();
+ }
+ return accepted;
+ }
+
+ private static HashSet<Outgoing> threads = new HashSet<Outgoing>();
+ private static int serials = 1;
+ private int serial = serials++;
+ private Mailbox.Iterator it;
+
+ public Outgoing() {
+ synchronized(Outgoing.class) {
+ threads.add(this);
+ }
+ }
+
+ public void wake() {
+ int count = spool.count(Query.all());
+ Log.info(SMTP.Outgoing.class, "outgoing thread #"+serial+" woke up; " + count + " messages to send");
+ try {
+ while(true) {
+ boolean good = false;
+ synchronized(Outgoing.class) {
+ it = spool.iterator();
+ OUTER: for(; it.next(); ) {
+ for(Outgoing o : threads)
+ if (o!=this && o.it != null && o.it.uid()==it.uid())
+ continue OUTER;
+ good = true;
+ break;
+ }
+ }
+ if (!good) break;
+ try {
+ if (attempt(it.cur())) it.delete();
+ } catch (Exception e) {
+ Log.error(SMTP.Outgoing.class, e);
+ }
+ Log.info(this, "sleeping for 3s...");
+ Thread.sleep(3000);
+ }
+ } catch (Exception e) {
+ //if (e instanceof InterruptedException) throw e;
+ Log.error(SMTP.Outgoing.class, e);
+ }
+ Log.info(SMTP.Outgoing.class, "outgoing thread #"+serial+" going back to sleep");
+ it = null;
+ }
+
+ public void run() {
+ try {
+ while(true) {
+ Log.setThreadAnnotation("[outgoing #"+serial+"] ");
+ wake();
+ Thread.sleep(1000);
+ synchronized(Outgoing.class) {
+ Outgoing.class.wait(5 * 60 * 1000);
+ }
+ }
+ } catch (InterruptedException e) { Log.warn(this, e); }
+ }
+ }
+
+ public static InetAddress[] getMailExchangerIPs(String hostName) {
+ InetAddress[] ret;
+ try {
+ Hashtable env = new Hashtable();
+ env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
+ DirContext ictx = new InitialDirContext(env);
+ Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });
+ Attribute attr = attrs.get("MX");
+ if (attr == null) {
+ ret = new InetAddress[1];
+ try {
+ ret[0] = InetAddress.getByName(hostName);
+ return ret;
+ } catch (UnknownHostException uhe) {
+ Log.warn(SMTP.class, "no MX hosts or A record for " + hostName);
+ return new InetAddress[0];
+ }
+ } else {
+ ret = new InetAddress[attr.size()];
+ NamingEnumeration ne = attr.getAll();
+ for(int i=0; ne.hasMore();) {
+ String mx = (String)ne.next();
+ // FIXME we should be sorting here
+ mx = mx.substring(mx.indexOf(" ") + 1);
+ if (mx.charAt(mx.length() - 1) == '.') mx = mx.substring(0, mx.length() - 1);
+ InetAddress ia = InetAddress.getByName(mx);
+ if (ia.equals(IP.getIP(127,0,0,1))) continue;
+ ret[i++] = ia;
+ }
}
- return false; // FIXME: what does this mean?
+ } catch (Exception e) {
+ Log.warn(SMTP.class, "couldn't find MX host for " + hostName + " due to");
+ Log.warn(SMTP.class, e);
+ return new InetAddress[0];
}
+ return ret;
}
}
projects / org.ibex.mail.git / blobdiff