smtphandler.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

/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * 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:                                *
 *                                                                     *
 *     http://www.apache.org/licenses/LICENSE-2.0                      *
 *                                                                     *
 * Unless required by applicable law or agreed to in writing, software *
 * distributed under the License is distributed on an "AS IS" BASIS,   *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or     *
 * implied.  See the License for the specific language governing       *
 * permissions and limitations under the License.                      *
 ***********************************************************************/

package org.apache.james.smtpserver;

import org.apache.avalon.cornerstone.services.connection.ConnectionHandler;
import org.apache.avalon.excalibur.pool.Poolable;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.james.Constants;
import org.apache.james.core.MailHeaders;
import org.apache.james.core.MailImpl;
import org.apache.james.services.MailServer;
import org.apache.james.services.UsersRepository;
import org.apache.james.util.*;
import org.apache.james.util.watchdog.BytesReadResetInputStream;
import org.apache.james.util.watchdog.Watchdog;
import org.apache.james.util.watchdog.WatchdogTarget;
import org.apache.mailet.MailAddress;
import javax.mail.MessagingException;
import java.io.*;
import java.net.Socket;
import java.net.SocketException;
import java.util.*;
/**
 * Provides SMTP functionality by carrying out the server side of the SMTP
 * interaction.
 *
 * @version CVS $Revision: 1.35.4.19 $ $Date: 2004/05/08 02:28:30 $
 */
public class SMTPHandler
    extends AbstractLogEnabled
    implements ConnectionHandler, Poolable {

    /**
     * SMTP Server identification string used in SMTP headers
     */
    private final static String SOFTWARE_TYPE = "JAMES SMTP Server "
                                                 + Constants.SOFTWARE_VERSION;

    // Keys used to store/lookup data in the internal state hash map

    private final static String CURRENT_HELO_MODE = "CURRENT_HELO_MODE"; // HELO or EHLO
    private final static String SENDER = "SENDER_ADDRESS";     // Sender's email address
    private final static String MESG_FAILED = "MESG_FAILED";   // Message failed flag
    private final static String MESG_SIZE = "MESG_SIZE";       // The size of the message
    private final static String RCPT_LIST = "RCPT_LIST";   // The message recipients

    /**
     * The character array that indicates termination of an SMTP connection
     */
    private final static char[] SMTPTerminator = { '\r', '\n', '.', '\r', '\n' };

    /**
     * Static Random instance used to generate SMTP ids
     */
    private final static Random random = new Random();

    /**
     * Static RFC822DateFormat used to generate date headers
     */
    private final static RFC822DateFormat rfc822DateFormat = new RFC822DateFormat();

    /**
     * The text string for the SMTP HELO command.
     */
    private final static String COMMAND_HELO = "HELO";

    /**
     * The text string for the SMTP EHLO command.
     */
    private final static String COMMAND_EHLO = "EHLO";

    /**
     * The text string for the SMTP AUTH command.
     */
    private final static String COMMAND_AUTH = "AUTH";

    /**
     * The text string for the SMTP MAIL command.
     */
    private final static String COMMAND_MAIL = "MAIL";

    /**
     * The text string for the SMTP RCPT command.
     */
    private final static String COMMAND_RCPT = "RCPT";

    /**
     * The text string for the SMTP NOOP command.
     */
    private final static String COMMAND_NOOP = "NOOP";

    /**
     * The text string for the SMTP RSET command.
     */
    private final static String COMMAND_RSET = "RSET";

    /**
     * The text string for the SMTP DATA command.
     */
    private final static String COMMAND_DATA = "DATA";

    /**
     * The text string for the SMTP QUIT command.
     */
    private final static String COMMAND_QUIT = "QUIT";

    /**
     * The text string for the SMTP HELP command.
     */
    private final static String COMMAND_HELP = "HELP";

    /**
     * The text string for the SMTP VRFY command.
     */
    private final static String COMMAND_VRFY = "VRFY";

    /**
     * The text string for the SMTP EXPN command.
     */
    private final static String COMMAND_EXPN = "EXPN";

    /**
     * The text string for the SMTP AUTH type PLAIN.
     */
    private final static String AUTH_TYPE_PLAIN = "PLAIN";

    /**
     * The text string for the SMTP AUTH type LOGIN.
     */
    private final static String AUTH_TYPE_LOGIN = "LOGIN";

    /**
     * The text string for the SMTP MAIL command SIZE option.
     */
    private final static String MAIL_OPTION_SIZE = "SIZE";

    /**
     * The mail attribute holding the SMTP AUTH user name, if any.
     */
    private final static String SMTP_AUTH_USER_ATTRIBUTE_NAME = "org.apache.james.SMTPAuthUser";
    
    /**
     * The thread executing this handler
     */
    private Thread handlerThread;

    /**
     * The TCP/IP socket over which the SMTP
     * dialogue is occurring.
     */
    private Socket socket;

    /**
     * The incoming stream of bytes coming from the socket.
     */
    private InputStream in;

    /**
     * The writer to which outgoing messages are written.
     */
    private PrintWriter out;

    /**
     * A Reader wrapper for the incoming stream of bytes coming from the socket.
     */
    private BufferedReader inReader;

    /**
     * The remote host name obtained by lookup on the socket.
     */
    private String remoteHost;

    /**
     * The remote IP address of the socket.
     */
    private String remoteIP;

    /**
     * The user name of the authenticated user associated with this SMTP transaction.
     */
    private String authenticatedUser;

    /**
     * whether or not authorization is required for this connection
     */
    private boolean authRequired;

    /**
     * whether or not authorization is required for this connection
     */
    private boolean relayingAllowed;

    /**
     * The id associated with this particular SMTP interaction.
     */
    private String smtpID;

    /**
     * The per-service configuration data that applies to all handlers
     */
    private SMTPHandlerConfigurationData theConfigData;

    /**
     * The hash map that holds variables for the SMTP message transfer in progress.
     *
     * This hash map should only be used to store variable set in a particular
     * set of sequential MAIL-RCPT-DATA commands, as described in RFC 2821.  Per
     * connection values should be stored as member variables in this class.
     */
    private HashMap state = new HashMap();

    /**
     * The watchdog being used by this handler to deal with idle timeouts.
     */
    Watchdog theWatchdog;

    /**
     * The watchdog target that idles out this handler.
     */
    WatchdogTarget theWatchdogTarget = new SMTPWatchdogTarget();

    /**
     * The per-handler response buffer used to marshal responses.
     */
    StringBuffer responseBuffer = new StringBuffer(256);

    /**
     * Set the configuration data for the handler
     *
     * @param theData the per-service configuration data for this handler
     */
    void setConfigurationData(SMTPHandlerConfigurationData theData) {
        theConfigData = theData;
    }

    /**
     * Set the Watchdog for use by this handler.
     *
     * @param theWatchdog the watchdog
     */
    void setWatchdog(Watchdog theWatchdog) {
        this.theWatchdog = theWatchdog;
    }

    /**
     * Gets the Watchdog Target that should be used by Watchdogs managing
     * this connection.
     *
     * @return the WatchdogTarget
     */
    WatchdogTarget getWatchdogTarget() {
        return theWatchdogTarget;
    }

    /**
     * Idle out this connection
     */
    void idleClose() {
        if (getLogger() != null) {
            getLogger().error("SMTP Connection has idled out.");
        }
        try {
            if (socket != null) {
                socket.close();
            }
        } catch (Exception e) {
            // ignored
        }

        synchronized (this) {
            // Interrupt the thread to recover from internal hangs
            if (handlerThread != null) {
                handlerThread.interrupt();
            }
        }
    }

    /**
     * @see org.apache.avalon.cornerstone.services.connection.ConnectionHandler#handleConnection(Socket)
     */
    public void handleConnection(Socket connection) throws IOException {

        try {
            this.socket = connection;
            synchronized (this) {
                handlerThread = Thread.currentThread();
            }
            in = new BufferedInputStream(socket.getInputStream(), 1024);
            // An ASCII encoding can be used because all transmissions other
            // that those in the DATA command are guaranteed
            // to be ASCII
            // inReader = new BufferedReader(new InputStreamReader(in, "ASCII"), 512);
            inReader = new CRLFTerminatedReader(in, "ASCII");
            remoteIP = socket.getInetAddress().getHostAddress();
            remoteHost = socket.getInetAddress().getHostName();
            smtpID = random.nextInt(1024) + "";
            relayingAllowed = theConfigData.isRelayingAllowed(remoteIP);
            authRequired = theConfigData.isAuthRequired(remoteIP);
            resetState();
        } catch (Exception e) {