plainsocketimpl.java

This is a resource based on j2me embedded,if you dont understand,you can connection with me .

/*
 * @(#)PlainSocketImpl.java	1.51 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.  
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
 *   
 * This program is free software; you can redistribute it and/or  
 * modify it under the terms of the GNU General Public License version  
 * 2 only, as published by the Free Software Foundation.   
 *   
 * This program is distributed in the hope that it will be useful, but  
 * WITHOUT ANY WARRANTY; without even the implied warranty of  
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
 * General Public License version 2 for more details (a copy is  
 * included at /legal/license.txt).   
 *   
 * You should have received a copy of the GNU General Public License  
 * version 2 along with this work; if not, write to the Free Software  
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
 * 02110-1301 USA   
 *   
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
 * Clara, CA 95054 or visit www.sun.com if you need additional  
 * information or have any questions. 
 *
 */

package java.net;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileDescriptor;

import sun.net.ConnectionResetException;

/**
 * Default Socket Implementation. This implementation does
 * not implement any security checks.  It does support SOCKS version 4.
 * Note this class should <b>NOT</b> be public.
 *
 * @author  Steven B. Byrne
 * @version 1.51 10/10/06
 */
class PlainSocketImpl extends SocketImpl
{
    /* instance variable for SO_TIMEOUT */
    int timeout;   // timeout in millisec
    // traffic class
    private int trafficClass;

    private boolean shut_rd = false;
    private boolean shut_wr = false;
    
    private SocketInputStream socketInputStream = null;

    /* number of threads using the FileDescriptor */
    private int fdUseCount = 0;

    /* lock when increment/decrementing fdUseCount */
    private Object fdLock = new Object();

    /* indicates a close is pending on the file descriptor */
    private boolean closePending = false;
    private static final int REQUEST_REJECTED_NO_IDENTD  = 92;
    private static final int REQUEST_REJECTED_DIFF_IDENTS = 93;

    /* indicates connection reset state */
    private int CONNECTION_NOT_RESET = 0;
    private int CONNECTION_RESET_PENDING = 1;
    private int CONNECTION_RESET = 2;
    private int resetState;
    private Object resetLock = new Object();

    public static final String socksDefaultPortStr	= "1080";

    /**
     * Load net library into runtime.
     */
    static {
	java.security.AccessController.doPrivileged(
		  new sun.security.action.LoadLibraryAction("net"));
        /*
         * Wrap initProto() in a privileged block so that we
         * can read system properties.
         */
        java.security.AccessController.doPrivileged(
                      new java.security.PrivilegedAction() {
                          public Object run() 
                          {
                            initProto();
                            return null;
                          }
                        } );
    }

    /**
     * Constructs an empty instance.
     */
    PlainSocketImpl() { }

    /**
     * Constructs an instance with the given file descriptor.
     */
    PlainSocketImpl(FileDescriptor fd) {
	this.fd = fd;
    }

    /**
     * Creates a socket with a boolean that specifies whether this
     * is a stream socket (true) or an unconnected UDP socket (false).
     */
    protected synchronized void create(boolean stream) throws IOException {
	fd = new FileDescriptor();
	socketCreate(stream);
	if (socket != null)
	    socket.setCreated();
	if (serverSocket != null)
	    serverSocket.setCreated();
    }

    /**
     * Creates a socket and connects it to the specified port on
     * the specified host.
     * @param host the specified host
     * @param port the specified port
     */
    protected void connect(String host, int port)
        throws UnknownHostException, IOException
    {
	IOException pending = null;
	try {
	    address = InetAddress.getByName(host);

	    try {
		connectToAddress(address, port, timeout);
		return;
	    } catch (IOException e) {
		pending = e;
	    }
	} catch (UnknownHostException e) {
	    pending = e;
	}

	// everything failed
	close();
	throw pending;
    }

    /**
     * Creates a socket and connects it to the specified address on
     * the specified port.
     * @param address the address
     * @param port the specified port
     */
    protected void connect(InetAddress address, int port) throws IOException {
	this.port = port;
	this.address = address;

	try {
	    connectToAddress(address, port, timeout);
	    return;
	} catch (IOException e) {
	    // everything failed
	    close();
	    throw e;
	}
    }

    /**
     * Creates a socket and connects it to the specified address on
     * the specified port.
     * @param address the address
     * @param timeout the timeout value in milliseconds, or zero for no timeout.
     * @throws IOException if connection fails
     * @throws  IllegalArgumentException if address is null or is a
     *          SocketAddress subclass not supported by this socket
     * @since 1.4
     */
    protected void connect(SocketAddress address, int timeout) throws IOException {
	if (address == null || !(address instanceof InetSocketAddress))
	    throw new IllegalArgumentException("unsupported address type");
	InetSocketAddress addr = (InetSocketAddress) address;
	if (addr.isUnresolved())
	    throw new UnknownHostException(addr.getHostName());
	this.port = addr.getPort();
	this.address = addr.getAddress();

	try {
	    connectToAddress(this.address, port, timeout);
	    return;
	} catch (IOException e) {
	    // everything failed
	    close();
	    throw e;
	}
    }

    private void connectToAddress(InetAddress address, int port, int timeout) throws IOException {
	if (address.isAnyLocalAddress()) {
	    doConnect(InetAddress.getLocalHost(), port, timeout);
	} else {
	    doConnect(address, port, timeout);
	}
    }

    public void setOption(int opt, Object val) throws SocketException {
	if (isClosedOrPending()) {
	    throw new SocketException("Socket Closed");
	}
	boolean on = true;
	switch (opt) {
	    /* check type safety b4 going native.  These should never
	     * fail, since only java.Socket* has access to
	     * PlainSocketImpl.setOption().
	     */
	case SO_LINGER:
	    if (val == null || (!(val instanceof Integer) && !(val instanceof Boolean)))
		throw new SocketException("Bad parameter for option");
	    if (val instanceof Boolean) {
		/* true only if disabling - enabling should be Integer */
		on = false;
	    }
	    break;
	case SO_TIMEOUT:
	    if (val == null || (!(val instanceof Integer)))
		throw new SocketException("Bad parameter for SO_TIMEOUT");
	    int tmp = ((Integer) val).intValue();
	    if (tmp < 0)
		throw new IllegalArgumentException("timeout < 0");
	    timeout = tmp;
	    break;
	case IP_TOS:
	     if (val == null || !(val instanceof Integer)) {
		 throw new SocketException("bad argument for IP_TOS");
	     }
	     trafficClass = ((Integer)val).intValue();
	     break;
	case SO_BINDADDR:
	    throw new SocketException("Cannot re-bind socket");
	case TCP_NODELAY:
	    if (val == null || !(val instanceof Boolean))
		throw new SocketException("bad parameter for TCP_NODELAY");
	    on = ((Boolean)val).booleanValue();
	    break;
	case SO_SNDBUF:
	case SO_RCVBUF:
	    if (val == null || !(val instanceof Integer) ||
		!(((Integer)val).intValue() > 0)) {
		throw new SocketException("bad parameter for SO_SNDBUF " +
					  "or SO_RCVBUF");
	    }
	    break;
	case SO_KEEPALIVE:
	    if (val == null || !(val instanceof Boolean))
		throw new SocketException("bad parameter for SO_KEEPALIVE");
	    on = ((Boolean)val).booleanValue();
	    break;
	case SO_OOBINLINE:
	    if (val == null || !(val instanceof Boolean))
		throw new SocketException("bad parameter for SO_OOBINLINE");
	    on = ((Boolean)val).booleanValue();
	    break;
	case SO_REUSEADDR:
	    if (val == null || !(val instanceof Boolean)) 
	        throw new SocketException("bad parameter for SO_REUSEADDR");
	    on = ((Boolean)val).booleanValue();
	    break;
	default:
	    throw new SocketException("unrecognized TCP option: " + opt);
	}
	socketSetOption(opt, on, val);
    }
    public Object getOption(int opt) throws SocketException {
	if (isClosedOrPending()) {
	    throw new SocketException("Socket Closed");
	}
	if (opt == SO_TIMEOUT) {
	    return new Integer(timeout);
	}
	int ret = 0;
	/*
	 * The native socketGetOption() knows about 3 options.
	 * The 32 bit value it returns will be interpreted according
	 * to what we're asking.  A return of -1 means it understands
	 * the option but its turned off.  It will raise a SocketException
	 * if "opt" isn't one it understands.
	 */

	switch (opt) {
	case TCP_NODELAY:
	    ret = socketGetOption(opt, null);
	    return (ret == -1) ? new Boolean(false): new Boolean(true);
	case SO_OOBINLINE:
	    ret = socketGetOption(opt, null);
	    return (ret == -1) ? new Boolean(false): new Boolean(true);
	case SO_LINGER:
	    ret = socketGetOption(opt, null);
	    return (ret == -1) ? new Boolean(false): (Object)(new Integer(ret));
	case SO_REUSEADDR:
	    ret = socketGetOption(opt, null);
	    return (ret == -1) ? new Boolean(false): new Boolean(true);
	case SO_BINDADDR:
	    InetAddressContainer in = new InetAddressContainer();
	    ret = socketGetOption(opt, in); 
	    return in.addr;
	case SO_SNDBUF:
        case SO_RCVBUF:
	    ret = socketGetOption(opt, null);
	    return new Integer(ret);
	case IP_TOS:
	    ret = socketGetOption(opt, null);
	    if (ret == -1) { // ipv6 tos
		return new Integer(trafficClass);
	    } else {
		return new Integer(ret);
	    }
	case SO_KEEPALIVE:
	    ret = socketGetOption(opt, null);
  	    return (ret == -1) ? new Boolean(false): new Boolean(true);
	// should never get here
	default:
	    return null;
	}
    }

    /**
     * The workhorse of the connection operation.  Tries several times to
     * establish a connection to the given <host, port>.  If unsuccessful,
     * throws an IOException indicating what went wrong.
     */

    private synchronized void doConnect(InetAddress address, int port, int timeout) throws IOException {
        try {
	    acquireFD();
	    try {
	        socketConnect(address, port, timeout);
		// If we have a ref. to the Socket, then sets the flags
		// created, bound & connected to true.