smtpserver.java

java 开发的邮件服务器平台。支持以下协议。 协议可以修改为自己的专门标识

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 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
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 * ------------------------------------------------------------------- *
 * Licensed under the Apache License, Version 2.0 (the "License"); you *
 * may not use this file except in compliance with the License. You    *
 * may obtain a copy of the License at:                                *
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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.NetMatcher;
import org.apache.james.util.watchdog.Watchdog;
import org.apache.james.util.watchdog.WatchdogFactory;
import org.apache.mailet.MailetContext;

/**
 * <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
 */
/*
 * IMPORTANT: SMTPServer extends AbstractJamesService.  If you implement ANY
 * lifecycle methods, you MUST call super.<method> as well.
 */
public class SMTPServer extends AbstractJamesService implements Component, SMTPServerMBean {

    /**
     * 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;

    /**
     * This is a Network Matcher that should be configured to contain
     * authorized networks that bypass SMTP AUTH requirements.
     */
    private NetMatcher authorizedNetworks = null;

    /**
     * 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.");
            }

            String authorizedAddresses = handlerConfiguration.getChild("authorizedAddresses").getValue(null);
            if (!authRequired && authorizedAddresses == null) {
                /* if SMTP AUTH is not requred then we will use
                 * authorizedAddresses to determine whether or not to
                 * relay e-mail.  Therefore if SMTP AUTH is not
                 * required, we will not relay e-mail unless the
                 * sending IP address is authorized.
                 *
                 * Since this is a change in behavior for James v2,
                 * create a default authorizedAddresses network of
                 * 0.0.0.0/0, which matches all possible addresses, thus
                 * preserving the current behavior.
                 *
                 * James v3 should require the <authorizedAddresses>
                 * element.
                 */
                authorizedAddresses = "0.0.0.0/0.0.0.0";
            }

            if (authorizedAddresses != null) {
                java.util.StringTokenizer st = new java.util.StringTokenizer(authorizedAddresses, ", ", false);
                java.util.Collection networks = new java.util.ArrayList();
                while (st.hasMoreTokens()) {
                    String addr = st.nextToken();
                    networks.add(addr);
                }
                authorizedNetworks = new NetMatcher(networks);
            }

            if (authorizedNetworks != null) {
                getLogger().info("Authorized addresses: " + authorizedNetworks.toString());
            }

            // 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) {