/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache", "Jakarta", "JAMES" and "Apache Software Foundation"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
package org.apache.james.smtpserver;
import org.apache.avalon.cornerstone.services.connection.ConnectionHandler;
import org.apache.avalon.excalibur.pool.DefaultPool;
import org.apache.avalon.excalibur.pool.HardResourceLimitingPool;
import org.apache.avalon.excalibur.pool.ObjectFactory;
import org.apache.avalon.excalibur.pool.Pool;
import org.apache.avalon.excalibur.pool.Poolable;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.activity.Initializable;
import org.apache.avalon.framework.component.ComponentException;
import org.apache.avalon.framework.component.ComponentManager;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.logger.LogEnabled;
import org.apache.james.Constants;
import org.apache.james.core.AbstractJamesService;
import org.apache.james.services.MailServer;
import org.apache.james.services.UsersRepository;
import org.apache.james.services.UsersStore;
import org.apache.james.util.watchdog.Watchdog;
import org.apache.james.util.watchdog.WatchdogFactory;
import org.apache.james.util.watchdog.WatchdogTarget;
import org.apache.mailet.MailetContext;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
* <p>Accepts SMTP connections on a server socket and dispatches them to SMTPHandlers.</p>
*
* <p>Also responsible for loading and parsing SMTP specific configuration.</p>
*
* @version 1.1.0, 06/02/2001
* @author Federico Barbieri <scoobie@pop.systemy.it>
* @author Matthew Pangaro <mattp@lokitech.com>
* @author <a href="mailto:donaldp@apache.org">Peter Donald</a>
* @author <a href="mailto:danny@apache.org">Danny Angus</a>
* @author Peter M. Goldstein <farsight@alum.mit.edu>
*/
/*
* IMPORTANT: SMTPServer extends AbstractJamesService. If you implement ANY
* lifecycle methods, you MUST call super.<method> as well.
*/
public class SMTPServer extends AbstractJamesService implements Component {
/**
* The mailet context - we access it here to set the hello name for the Mailet API
*/
MailetContext mailetcontext;
/**
* The user repository for this server - used to authenticate
* users.
*/
private UsersRepository users;
/**
* The internal mail server service.
*/
private MailServer mailServer;
/**
* Whether authentication is required to use
* this SMTP server.
*/
private boolean authRequired = false;
/**
* Whether the server verifies that the user
* actually sending an email matches the
* authentication credentials attached to the
* SMTP interaction.
*/
private boolean verifyIdentity = false;
/**
* The maximum message size allowed by this SMTP server. The default
* value, 0, means no limit.
*/
private long maxMessageSize = 0;
/**
* The number of bytes to read before resetting
* the connection timeout timer. Defaults to
* 20 KB.
*/
private int lengthReset = 20 * 1024;
/**
* The pool used to provide SMTP Handler objects
*/
private Pool theHandlerPool = null;
/**
* The pool used to provide SMTP Handler objects
*/
private ObjectFactory theHandlerFactory = new SMTPHandlerFactory();
/**
* The factory used to generate Watchdog objects
*/
private WatchdogFactory theWatchdogFactory;
/**
* The configuration data to be passed to the handler
*/
private SMTPHandlerConfigurationData theConfigData
= new SMTPHandlerConfigurationDataImpl();
/**
* @see org.apache.avalon.framework.component.Composable#compose(ComponentManager)
*/
public void compose(final ComponentManager componentManager) throws ComponentException {
super.compose(componentManager);
mailetcontext = (MailetContext) componentManager.lookup("org.apache.mailet.MailetContext");
mailServer = (MailServer) componentManager.lookup("org.apache.james.services.MailServer");
UsersStore usersStore =
(UsersStore) componentManager.lookup("org.apache.james.services.UsersStore");
users = usersStore.getRepository("LocalUsers");
if (users == null) {
throw new ComponentException("The user repository could not be found.");
}
}
/**
* @see org.apache.avalon.framework.configuration.Configurable#configure(Configuration)
*/
public void configure(final Configuration configuration) throws ConfigurationException {
super.configure(configuration);
if (isEnabled()) {
mailetcontext.setAttribute(Constants.HELLO_NAME, helloName);
Configuration handlerConfiguration = configuration.getChild("handler");
authRequired = handlerConfiguration.getChild("authRequired").getValueAsBoolean(false);
verifyIdentity = handlerConfiguration.getChild("verifyIdentity").getValueAsBoolean(false);
if (authRequired) {
if (verifyIdentity) {
getLogger().info("This SMTP server requires authentication and verifies that the authentication credentials match the sender address.");
} else {
getLogger().info("This SMTP server requires authentication, but doesn't verify that the authentication credentials match the sender address.");
}
} else {
getLogger().info("This SMTP server does not require authentication.");
}
// get the message size limit from the conf file and multiply
// by 1024, to put it in bytes
maxMessageSize = handlerConfiguration.getChild( "maxmessagesize" ).getValueAsLong( maxMessageSize ) * 1024;
if (maxMessageSize > 0) {
getLogger().info("The maximum allowed message size is " + maxMessageSize + " bytes.");
} else {
getLogger().info("No maximum message size is enforced for this server.");
}
// How many bytes to read before updating the timer that data is being transfered
lengthReset = configuration.getChild("lengthReset").getValueAsInteger(lengthReset);
if (lengthReset <= 0) {
throw new ConfigurationException("The configured value for the idle timeout reset, " + lengthReset + ", is not valid.");
}
if (getLogger().isInfoEnabled()) {
getLogger().info("The idle timeout will be reset every " + lengthReset + " bytes.");
}
} else {
mailetcontext.setAttribute(Constants.HELLO_NAME, "localhost");
}
}
/**
* @see org.apache.avalon.framework.activity.Initializable#initialize()
*/
public void initialize() throws Exception {
super.initialize();
if (!isEnabled()) {
return;
}
if (connectionLimit != null) {
theHandlerPool = new HardResourceLimitingPool(theHandlerFactory, 5, connectionLimit.intValue());
if (getLogger().isDebugEnabled()) {
getLogger().debug("Using a bounded pool for SMTP handlers with upper limit " + connectionLimit.intValue());
}
} else {
// NOTE: The maximum here is not a real maximum. The handler pool will continue to
// provide handlers beyond this value.
theHandlerPool = new DefaultPool(theHandlerFactory, null, 5, 30);
getLogger().debug("Using an unbounded pool for SMTP handlers.");
}
if (theHandlerPool instanceof LogEnabled) {
((LogEnabled)theHandlerPool).enableLogging(getLogger());
}
if (theHandlerPool instanceof Initializable) {
((Initializable)theHandlerPool).initialize();
}
theWatchdogFactory = getWatchdogFactory();
}
/**
* @see org.apache.james.core.AbstractJamesService#getDefaultPort()
*/
protected int getDefaultPort() {
return 25;
}
/**
* @see org.apache.james.core.AbstractJamesService#getServiceType()
*/
public String getServiceType() {
return "SMTP Service";
}
/**
* @see org.apache.avalon.cornerstone.services.connection.AbstractHandlerFactory#newHandler()
*/
protected ConnectionHandler newHandler()
throws Exception {
SMTPHandler theHandler = (SMTPHandler)theHandlerPool.get();
if (getLogger().isDebugEnabled()) {
getLogger().debug("Getting SMTPHandler from pool.");
}
Watchdog theWatchdog = theWatchdogFactory.getWatchdog(theHandler.getWatchdogTarget());
theHandler.setConfigurationData(theConfigData);
theHandler.setWatchdog(theWatchdog);
return theHandler;
}
/**
* @see org.apache.avalon.cornerstone.services.connection.ConnectionHandlerFactory#releaseConnectionHandler(ConnectionHandler)
*/
public void releaseConnectionHandler( ConnectionHandler connectionHandler ) {
if (!(connectionHandler instanceof SMTPHandler)) {
throw new IllegalArgumentException("Attempted to return non-SMTPHandler to pool.");
}
if (getLogger().isDebugEnabled()) {
getLogger().debug("Returning SMTPHandler to pool.");
}
theHandlerPool.put((Poolable)connectionHandler);
}
/**
* The factory for producing handlers.
*/
private static class SMTPHandlerFactory
implements ObjectFactory {
/**
* @see org.apache.avalon.excalibur.pool.ObjectFactory#newInstance()
*/
public Object newInstance() throws Exception {
return new SMTPHandler();
}
/**
* @see org.apache.avalon.excalibur.pool.ObjectFactory#getCreatedClass()
*/
public Class getCreatedClass() {
return SMTPHandler.class;
}
/**
* @see org.apache.avalon.excalibur.pool.ObjectFactory#decommision(Object)
*/
public void decommission( Object object ) throws Exception {
return;
}
}
/**
* A class to provide SMTP handler configuration to the handlers
*/
private class SMTPHandlerConfigurationDataImpl
implements SMTPHandlerConfigurationData {
/**
* @see org.apache.james.smtpserver.SMTPHandlerConfigurationData#getHelloName()
*/
public String getHelloName() {
return SMTPServer.this.helloName;
}
/**
* @see org.apache.james.smtpserver.SMTPHandlerConfigurationData#getResetLength()
*/
public int getResetLength() {
return SMTPServer.this.lengthReset;
}
/**
* @see org.apache.james.smtpserver.SMTPHandlerConfigurationData#getMaxMessageSize()
*/
public long getMaxMessageSize() {
return SMTPServer.this.maxMessageSize;
}
/**
* @see org.apache.james.smtpserver.SMTPHandlerConfigurationData#isAuthRequired()
*/
public boolean isAuthRequired() {
return SMTPServer.this.authRequired;
}
/**
* @see org.apache.james.smtpserver.SMTPHandlerConfigurationData#isVerifyIdentity()
*/
public boolean isVerifyIdentity() {
return SMTPServer.this.verifyIdentity;
}
/**
* @see org.apache.james.smtpserver.SMTPHandlerConfigurationData#getMailServer()
*/
public MailServer getMailServer() {
return SMTPServer.this.mailServer;
}
/**
* @see org.apache.james.smtpserver.SMTPHandlerConfigurationData#getUsersRepository()
*/
public UsersRepository getUsersRepository() {
return SMTPServer.this.users;
}
}
}