X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fibex%2Fmail%2Fprotocol%2FSMTP.java;h=af62e214bb550bbb6c76e036924808d82ceee7e9;hb=4ff26332350edaa3c6ebfa29408c61412a6a2e40;hp=82838a5c40947feedc0e9140d5c63e8b0c83cf36;hpb=65846109db6d650c6cd00775df5c03c54e7f86c1;p=org.ibex.mail.git

diff --git a/src/org/ibex/mail/protocol/SMTP.java b/src/org/ibex/mail/protocol/SMTP.java
index 82838a5..af62e21 100644
--- a/src/org/ibex/mail/protocol/SMTP.java
+++ b/src/org/ibex/mail/protocol/SMTP.java
@@ -1,119 +1,434 @@
+// 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;
-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 Queue queue = new Queue();
-        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.dequeue(true);
-                // FIXME
-            }
-        }
+import org.ibex.mail.*;
+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.*;
+
+// FIXME: logging: current logging sucks
+// FIXME: loop prevention
+// FIXME: probably need some throttling on outbound mail
+
+// 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 {
+
+    public static final SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z");
+    public static final int numOutgoingThreads = 5;
+
+    public static final int GRAYLIST_MINWAIT =  1000 * 60 * 60;           // one hour
+    public static final int GRAYLIST_MAXWAIT =  1000 * 60 * 60 * 24 * 5;  // five days
+
+    public static final Graylist graylist =
+        new Graylist(Mailbox.STORAGE_ROOT+"/db/graylist.sqlite");
+
+    public static final Whitelist whitelist =
+        new Whitelist(Mailbox.STORAGE_ROOT+"/db/whitelist.sqlite");
+
+    public static final int MAX_MESSAGE_SIZE =
+        Integer.parseInt(System.getProperty("org.ibex.mail.smtp.maxMessageSize", "-1"));
+
+    private static final Mailbox spool =
+        FileBasedMailbox.getFileBasedMailbox(Mailbox.STORAGE_ROOT,false).slash("spool",true).slash("smtp",true);
+
+    static {
+        for(int i=0; i<numOutgoingThreads; i++)
+            new Outgoing().start();
     }
 
-    private class Listener extends Incoming implements ServerRequest {
-        TcpConnection conn;
-        public Listener(TcpConnection conn) { this.conn = conn; conn.getSocket().setSoTimeout(5 * 60 * 1000); }
-        public void init() { }
+    public static void accept(Message m) throws IOException {
+        if (!m.envelopeTo.isLocal()) Outgoing.accept(m);
+        else                         Target.root.accept(m);
+    }
 
-        public boolean handleRequest() throws IOException {
-            ReadStream rs = conn.getReadStream();
-            WriteStream ws = conn.getWriteStream();
-            ws.setNewLineString("\r\n");
+    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(); }
+    }
 
-            ws.println("220 " + conn.getVirtualHost() + " ESMTP " + this.getClass().getName());
+    // Server //////////////////////////////////////////////////////////////////////////////
 
+    public static class Server {
+        public void handleRequest(Connection conn) throws IOException {
+            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 (hello.toUpperCase().startsWith("HELO")) {
-                    ws.println("250 HELO " + conn.getVirtualHost());
-                    from = null;
-                    to = new Vector();
-
-                } else if (hello.toUpperCase().startsWith("EHLO")) {
-                    ws.pritnln("250-" + conn.getVirtualHost());
-                    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 = RFC2822.Address.parse(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);
+                    /*
+                    Log.warn("**"+conn.getRemoteAddress()+"**",
+                             "addr.isLocal(): " + addr.isLocal() + "\n" +
+                             "conn.getRemoteAddress().isLoopbackAddress(): " + conn.getRemoteAddress().isLoopbackAddress() + "\n" +
+                             "johnw: " + (from!=null&&from.toString().indexOf("johnw")!=-1) + "\n"
+                             );
+                    */
+                    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() || (from!=null&&from.toString().indexOf("johnw")!=-1)) {
+                        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(RFC2822.Address.parse(command));
-
-                } else if (command.toUpperCase().startsWith("DATA")) {
-                    if (from == null) { ws.println("503 MAIL FROM command must precede DATA"); continue; }
-                    if (to.size() == 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 RFC2822 class
-                    boolean good = false;
+                    conn.flush();
+                } 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; }
+                    if (!graylist.isWhitelisted(conn.getRemoteAddress()) && !conn.getRemoteAddress().isLoopbackAddress()) {
+                        long when = graylist.getGrayListTimestamp(conn.getRemoteAddress(), from+"", to+"");
+                        if (when == 0 || System.currentTimeMillis() - when > GRAYLIST_MAXWAIT) {
+                            graylist.setGrayListTimestamp(conn.getRemoteAddress(), from+"", to+"",  System.currentTimeMillis());
+                            conn.println("451 you are graylisted; please try back in one hour to be whitelisted");
+                            Log.warn(conn.getRemoteAddress().toString(), "451 you are graylisted; please try back in one hour to be whitelisted");
+                            conn.flush();
+                            continue;
+                        } else if (System.currentTimeMillis() - when > GRAYLIST_MINWAIT) {
+                            graylist.addWhitelist(conn.getRemoteAddress());
+                            conn.println("354 (you have been whitelisted) Enter message, ending with \".\" on a line by itself");
+                            Log.warn(conn.getRemoteAddress().toString(), "has been whitelisted");
+                        } else {
+                            conn.println("451 you are still graylisted (since "+new java.util.Date(when)+")");
+                            conn.flush();
+                            Log.warn(conn.getRemoteAddress().toString(), "451 you are still graylisted (since "+new java.util.Date(when)+")");
+                            continue;
+                        }
+                    } else {
+                        conn.println("354 Enter message, ending with \".\" on a line by itself");
+                    }
+                    conn.flush();
                     try {
-                        good = true;
-                        Message m = new Message(line, true);
-                        Target.default.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");
+                            if (MAX_MESSAGE_SIZE != -1 && buf.length() > MAX_MESSAGE_SIZE) {
+                                Log.error("**"+conn.getRemoteAddress()+"**",
+                                          "sorry, this mail server only accepts messages of less than " +
+                                          ByteSize.toString(MAX_MESSAGE_SIZE));
+                                throw new MailException.Malformed("sorry, this mail server only accepts messages of less than " +
+                                                                  ByteSize.toString(MAX_MESSAGE_SIZE));
+                            }
+                        }
+                        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 (Reject.RejectException re) {
+			Log.warn(SMTP.class, "rejecting message due to: " + re.reason + "\n   " + re.m.summary());
+			conn.println("501 " + re.reason);
+                    } 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");
                     }
-                    
-                } 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()); }
+        }
+    }
+
+
+    // Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
+
+    public static class Outgoing extends Thread {
+
+        private static final HashMap deadHosts = new HashMap();
+        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();
+            }
+        }
 
-                } 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() + " closing connection");
-                    break;
+        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");
-                }                    
-            
-            
-                return false;  // FIXME: what does this mean?
+                    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 = head.remove("return-path");
+                head = 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);
+                    if (ret[0].equals(IP.getIP(127,0,0,1)) || ret[0].isLoopbackAddress()) throw new UnknownHostException();
+                    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)) || ia.isLoopbackAddress()) continue;
+                    ret[i++] = ia;
+                }
             }
+        } 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;
     }
 }