import javax.naming.*;
import javax.naming.directory.*;
-// FIXME: bounce messages (must go to return-path unless empty, in which case do not send
-// FIXME: if more than 100 "Received" lines, must drop message
+// 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: exponential backoff on retry time?
// 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 { new Thread() { public void run() { Outgoing.runq(); } }.start(); }
+ 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);
// Server //////////////////////////////////////////////////////////////////////////////
public static class Server {
- public void handleRequest(Connection conn) {
+ 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());
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();
from = null; to = new Vector();
} else if (c.startsWith("EHLO")) {
remotehost = c.substring(5).trim();
- conn.println("250");
+ 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();
command = command.substring(8).trim();
if(command.indexOf(' ') != -1) command = command.substring(0, command.indexOf(' '));
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()) {
+ } 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");
}
+ 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; }
- conn.println("354 Enter message, ending with \".\" on a line by itself");
+ 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 {
StringBuffer buf = new StringBuffer();
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;
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");
- } catch (IOException ioe) {
- //conn.println("554 " + ioe.toString());
- Log.error(this, ioe);
- conn.close();
- return;
}
} else { conn.println("500 unrecognized command"); }
} catch (Message.Malformed e) { conn.println("501 " + e.toString()); }
// Outgoing Mail Thread //////////////////////////////////////////////////////////////////////////////
- public static class Outgoing {
+ public static class Outgoing extends Thread {
- private static final HashSet deadHosts = new HashSet();
+ 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; }
- //Log.info(SMTP.class, "queued: " + m.summary());
- /*
- if (m.traces.length >= 100)
- Log.warn(SMTP.Outgoing.class, "Message with " + m.traces.length + " trace hops; dropping\n" + m.summary());
- */
- else synchronized(Outgoing.class) {
+ 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.notify();
+ Outgoing.class.notifyAll();
}
}
- public static boolean attempt(Message m) throws IOException {
+ 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) {
- Log.warn(SMTP.Outgoing.class, "could not resolve " + m.envelopeTo.host + "; bouncing it\n" + m.summary());
- accept(m.bounce("could not resolve " + m.envelopeTo.host));
- return true;
+ 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) {
- Log.warn(SMTP.Outgoing.class, "could not send message after 5 days; bouncing it\n" + m.summary());
- accept(m.bounce("could not send for 5 days"));
- return true;
+ 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 (deadHosts.contains(mx[i])) continue;
if (attempt(m, mx[i])) { return true; }
}
return false;
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");
+ 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(".");
- //Log.warn("***",s);
conn.println(s);
}
- //Log.warn("***","");
conn.println("");
stream = m.getBody().getStream();
for(String s = stream.readln(); s!=null; s=stream.readln()) {
if (s.startsWith(".")) conn.print(".");
- //Log.warn("***",s);
conn.println(s);
}
conn.println(".");
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);
return accepted;
}
- static void runq() {
+ 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 {
- Log.setThreadAnnotation("[outgoing smtp] ");
- Log.info(SMTP.Outgoing.class, "outgoing thread started; " + spool.count(Query.all()) + " messages to send");
while(true) {
- if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
- for(Mailbox.Iterator it = spool.iterator(); it.next(); ) {
- try {
- if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
- if (attempt(it.cur())) it.delete();
- } catch (Exception e) {
- if (e instanceof InterruptedException) throw e;
- Log.error(SMTP.Outgoing.class, e);
- }
- }
+ boolean good = false;
synchronized(Outgoing.class) {
- if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
- Log.info(SMTP.Outgoing.class, "outgoing thread going to sleep");
- Outgoing.class.wait(5 * 60 * 1000);
- deadHosts.clear();
- Log.info(SMTP.Outgoing.class,"outgoing thread woke up; "+spool.count(Query.all())+" messages in queue");
+ 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) {
- Log.error(SMTP.Outgoing.class, "outgoing thread killed by 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); }
}
}
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);
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;
+ if (ia.equals(IP.getIP(127,0,0,1)) || ia.isLoopbackAddress()) continue;
ret[i++] = ia;
}
}