socketconnection.java

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/**
 * $RCSfile$
 * $Revision: 3187 $
 * $Date: 2005-12-11 13:34:34 -0300 (Sun, 11 Dec 2005) $
 *
 * Copyright (C) 2004 Jive Software. All rights reserved.
 *
 * This software is published under the terms of the GNU Public License (GPL),
 * a copy of which is included in this distribution.
 */

package org.jivesoftware.wildfire.net;

import com.jcraft.jzlib.JZlib;
import com.jcraft.jzlib.ZOutputStream;
import org.jivesoftware.util.JiveGlobals;
import org.jivesoftware.util.LocaleUtils;
import org.jivesoftware.util.Log;
import org.jivesoftware.wildfire.*;
import org.jivesoftware.wildfire.auth.UnauthorizedException;
import org.jivesoftware.wildfire.interceptor.InterceptorManager;
import org.jivesoftware.wildfire.interceptor.PacketRejectedException;
import org.jivesoftware.wildfire.server.IncomingServerSession;
import org.xmpp.packet.Packet;

import javax.net.ssl.SSLSession;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.InetAddress;
import java.net.Socket;
import java.nio.channels.Channels;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicBoolean;

/**
 * An object to track the state of a XMPP client-server session.
 * Currently this class contains the socket channel connecting the
 * client and server.
 *
 * @author Iain Shigeoka
 */
public class SocketConnection implements Connection {

    /**
     * The utf-8 charset for decoding and encoding XMPP packet streams.
     */
    public static final String CHARSET = "UTF-8";

    private static Map<SocketConnection, String> instances =
            new ConcurrentHashMap<SocketConnection, String>();

    /**
     * Milliseconds a connection has to be idle to be closed. Timeout is disabled by default. It's
     * up to the connection's owner to configure the timeout value. Sending stanzas to the client
     * is not considered as activity. We are only considering the connection active when the
     * client sends some data or hearbeats (i.e. whitespaces) to the server.
     * The reason for this is that sending data will fail if the connection is closed. And if
     * the thread is blocked while sending data (because the socket is closed) then the clean up
     * thread will close the socket anyway.
     */
    private long idleTimeout = -1;

    final private Map<ConnectionCloseListener, Object> listeners =
            new HashMap<ConnectionCloseListener, Object>();

    private Socket socket;
    private SocketReader socketReader;

    private Writer writer;
    private AtomicBoolean writing = new AtomicBoolean(false);

    /**
     * Deliverer to use when the connection is closed or was closed when delivering
     * a packet.
     */
    private PacketDeliverer backupDeliverer;

    private Session session;
    private boolean secure;
    private boolean compressed;
    private org.jivesoftware.util.XMLWriter xmlSerializer;
    private boolean flashClient = false;
    private int majorVersion = 1;
    private int minorVersion = 0;
    private String language = null;
    private TLSStreamHandler tlsStreamHandler;

    private long writeStarted = -1;

    /**
     * TLS policy currently in use for this connection.
     */
    private TLSPolicy tlsPolicy = TLSPolicy.optional;

    /**
     * Compression policy currently in use for this connection.
     */
    private CompressionPolicy compressionPolicy = CompressionPolicy.disabled;

    public static Collection<SocketConnection> getInstances() {
        return instances.keySet();
    }

    /**
     * Create a new session using the supplied socket.
     *
     * @param backupDeliverer the packet deliverer this connection will use when socket is closed.
     * @param socket the socket to represent.
     * @param isSecure true if this is a secure connection.
     * @throws NullPointerException if the socket is null.
     */
    public SocketConnection(PacketDeliverer backupDeliverer, Socket socket, boolean isSecure)
            throws IOException {
        if (socket == null) {
            throw new NullPointerException("Socket channel must be non-null");
        }

        this.secure = isSecure;
        this.socket = socket;
        // DANIELE: Modify socket to use channel
        if (socket.getChannel() != null) {
            writer = Channels.newWriter(
                    ServerTrafficCounter.wrapWritableChannel(socket.getChannel()), CHARSET);
        }
        else {
            writer = new BufferedWriter(new OutputStreamWriter(
                    ServerTrafficCounter.wrapOutputStream(socket.getOutputStream()), CHARSET));
        }
        this.backupDeliverer = backupDeliverer;
        xmlSerializer = new XMLSocketWriter(writer, this);

        instances.put(this, "");
    }

    /**
     * Returns the stream handler responsible for securing the plain connection and providing
     * the corresponding input and output streams.
     *
     * @return the stream handler responsible for securing the plain connection and providing
     *         the corresponding input and output streams.
     */
    public TLSStreamHandler getTLSStreamHandler() {
        return tlsStreamHandler;
    }

    /**
     * Secures the plain connection by negotiating TLS with the client. When connecting
     * to a remote server then <tt>clientMode</tt> will be <code>true</code> and
     * <tt>remoteServer</tt> is the server name of the remote server. Otherwise <tt>clientMode</tt>
     * will be <code>false</code> and  <tt>remoteServer</tt> null.
     *
     * @param clientMode boolean indicating if this entity is a client or a server.
     * @param remoteServer server name of the remote server we are connecting to or <tt>null</tt>
     *        when not in client mode.
     * @throws IOException if an error occured while securing the connection.
     */
    public void startTLS(boolean clientMode, String remoteServer) throws IOException {
        if (!secure) {
            secure = true;
            // Prepare for TLS
            tlsStreamHandler = new TLSStreamHandler(socket, clientMode, remoteServer, session instanceof IncomingServerSession);
            if (!clientMode) {
                // Indicate the client that the server is ready to negotiate TLS
                deliverRawText("<proceed xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/>");
            }
            // Start handshake
            tlsStreamHandler.start();
            // Use new wrapped writers
            writer = new BufferedWriter(new OutputStreamWriter(tlsStreamHandler.getOutputStream(), CHARSET));
            xmlSerializer = new XMLSocketWriter(writer, this);
        }
    }

    /**
     * Start using compression for this connection. Compression will only be available after TLS
     * has been negotiated. This means that a connection can never be using compression before
     * TLS. However, it is possible to use compression without TLS.
     *
     * @throws IOException if an error occured while starting compression.
     */
    public void startCompression() throws IOException {
        compressed = true;

        if (tlsStreamHandler == null) {
            ZOutputStream out = new ZOutputStream(
                    ServerTrafficCounter.wrapOutputStream(socket.getOutputStream()),
                    JZlib.Z_BEST_COMPRESSION);
            out.setFlushMode(JZlib.Z_PARTIAL_FLUSH);
            writer = new BufferedWriter(new OutputStreamWriter(out, CHARSET));
            xmlSerializer = new XMLSocketWriter(writer, this);
        }
        else {
            ZOutputStream out = new ZOutputStream(tlsStreamHandler.getOutputStream(), JZlib.Z_BEST_COMPRESSION);
            out.setFlushMode(JZlib.Z_PARTIAL_FLUSH);
            writer = new BufferedWriter(new OutputStreamWriter(out, CHARSET));
            xmlSerializer = new XMLSocketWriter(writer, this);
        }
    }

    public boolean validate() {
        if (isClosed()) {
            return false;
        }
        boolean allowedToWrite = false;
        try {
            requestWriting();
            allowedToWrite = true;
            // Register that we started sending data on the connection
            writeStarted();
            writer.write(" ");
            writer.flush();
        }
        catch (Exception e) {
            Log.warn("Closing no longer valid connection" + "\n" + this.toString(), e);
            close();
        }
        finally {
            // Register that we finished sending data on the connection
            writeFinished();
            if (allowedToWrite) {
                releaseWriting();
            }
        }
        return !isClosed();
    }

    public void init(Session owner) {
        session = owner;
    }

    public Object registerCloseListener(ConnectionCloseListener listener, Object handbackMessage) {
        Object status = null;
        if (isClosed()) {
            listener.onConnectionClose(handbackMessage);
        }
        else {
            status = listeners.put(listener, handbackMessage);
        }
        return status;
    }

    public Object removeCloseListener(ConnectionCloseListener listener) {
        return listeners.remove(listener);
    }

    public InetAddress getInetAddress() {
        return socket.getInetAddress();
    }

    /**
     * Returns the port that the connection uses.
     *
     * @return the port that the connection uses.
     */
    public int getPort() {
        return socket.getPort();
    }

    /**
     * Returns the Writer used to send data to the connection. The writer should be
     * used with caution. In the majority of cases, the {@link #deliver(Packet)}
     * method should be used to send data instead of using the writer directly.
     * You must synchronize on the writer before writing data to it to ensure
     * data consistency:
     *
     * <pre>
     *  Writer writer = connection.getWriter();
     * synchronized(writer) {
     *     // write data....
     * }</pre>
     *
     * @return the Writer for this connection.
     */
    public Writer getWriter() {
        return writer;
    }

    public boolean isClosed() {
        if (session == null) {
            return socket.isClosed();
        }
        return session.getStatus() == Session.STATUS_CLOSED;
    }

    public boolean isSecure() {
        return secure;
    }

    public boolean isCompressed() {
        return compressed;
    }

    public TLSPolicy getTlsPolicy() {
        return tlsPolicy;
    }

    /**
     * Sets whether TLS is mandatory, optional or is disabled. When TLS is mandatory clients
     * are required to secure their connections or otherwise their connections will be closed.
     * On the other hand, when TLS is disabled clients are not allowed to secure their connections
     * using TLS. Their connections will be closed if they try to secure the connection. in this
     * last case.
     *
     * @param tlsPolicy whether TLS is mandatory, optional or is disabled.
     */
    public void setTlsPolicy(TLSPolicy tlsPolicy) {
        this.tlsPolicy = tlsPolicy;
    }

    public CompressionPolicy getCompressionPolicy() {
        return compressionPolicy;
    }

    /**
     * Sets whether compression is enabled or is disabled.
     *
     * @param compressionPolicy whether Compression is enabled or is disabled.
     */
    public void setCompressionPolicy(CompressionPolicy compressionPolicy) {
        this.compressionPolicy = compressionPolicy;
    }

    public long getIdleTimeout() {
        return idleTimeout;
    }

    /**
     * Sets the number of milliseconds a connection has to be idle to be closed. Sending
     * stanzas to the client is not considered as activity. We are only considering the
     * connection active when the client sends some data or hearbeats (i.e. whitespaces)
     * to the server.
     *