iputils.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 * Copyright (c) 2001 Sun Microsystems, Inc.  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
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * 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 SUN MICROSYSTEMS 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 Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: IPUtils.java,v 1.20 2006/03/01 17:51:58 bondolo Exp $
 */

package net.jxta.impl.endpoint;


import java.net.InetAddress;
import java.net.Inet6Address;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import javax.net.ServerSocketFactory;

import java.io.IOException;
import java.net.BindException;
import java.net.SocketException;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 * Utility methods for use by IP based transports.
 */
public final class IPUtils {
    
    /**
     * Log4j Logger
     **/
    private final static Logger LOG = Logger.getLogger(IPUtils.class.getName());
    
    final static Random random = new Random();
    
    final static String IPV4ANYADDRESS = "0.0.0.0";
    final static String IPV6ANYADDRESS = "::";
    
    final static String IPV4LOOPBACK = "127.0.0.1";
    final static String IPV6LOOPBACK = "::1";
    
    /**
     *  Constant which works as the IP "Any Address" value
     **/
    public final static InetAddress ANYADDRESS;
    public static InetAddress ANYADDRESSV4;
    public static InetAddress ANYADDRESSV6;
    
    /**
     *  Constant which works as the IP "Local Loopback" value;
     **/
    public final static InetAddress LOOPBACK;
    public static InetAddress LOOPBACKV4;
    public static InetAddress LOOPBACKV6;
    
    /**
     * Socket factory to allow changing the way Sockets are created
     * and connected.  A null value is ok and results in the regular
     * connectToFromNoFactory being used.
     *
     * Plugin in a different implementation via setSocketFactory().
     */
    private static SocketFactory socketFactory;
    
    /**
     * Socket factory to allow changing the way Sockets are created
     * and connected.  A null value is ok and results in the regular
     * connectToFromNoFactory being used.
     *
     * Plugin in a different implementation via setSocketFactory().
     */
    private static ServerSocketFactory serverSocketFactory;
    
    static {
        try {
            ANYADDRESSV4 = InetAddress.getByName( IPV4ANYADDRESS );
        } catch (Exception ignored) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn( "failed to intialize ANYADDRESSV4. Not fatal" );
            }
        }
        
        try {
            ANYADDRESSV6 = InetAddress.getByName( IPV6ANYADDRESS );
        } catch (Exception ignored) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn( "failed to intialize IPV6ANYADDRESS. Not fatal" );
            }
        }
        
        ANYADDRESS = (ANYADDRESSV4 == null) ? ANYADDRESSV6 : ANYADDRESSV4;
        
        try {
            LOOPBACKV4 = InetAddress.getByName( IPV4LOOPBACK );
        } catch (Exception ignored) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn( "failed to intialize IPV4LOOPBACK. Not fatal" );
            }
        }
        
        try {
            LOOPBACKV6 = InetAddress.getByName( IPV6LOOPBACK );
        } catch (Exception ignored) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn( "failed to intialize ANYADDRESSV4. Not fatal" );
            }
        }
        
        LOOPBACK = (LOOPBACKV4 == null) ? LOOPBACKV6 : LOOPBACKV4;
        
        if (LOOPBACK == null || ANYADDRESS == null) {
            if (LOG.isEnabledFor(Level.FATAL)) {
                LOG.fatal( "failure initializing statics. Neither IPV4 nor IPV6 seem to work." );
            }
            
            throw new IllegalStateException( "failure initializing statics. Neither IPV4 nor IPV6 seem to work." );
        }
    };
    
    /**
     *  This is a static utility class, you don't make instaces.
     **/
    private IPUtils() {
    }
    
    /**
     *  Provide an iterator which returns all of the local InetAddresses for this
     *  host.
     *
     *  @return iterator of InetAddress which is all of the InetAddress for all
     *  local interfaces.
     **/
    public static Iterator getAllLocalAddresses() {
        List allAddr = new ArrayList();
        
        Enumeration allInterfaces;
        try {
            allInterfaces = NetworkInterface.getNetworkInterfaces();
        } catch ( SocketException caught ) {
            if (LOG.isEnabledFor(Level.ERROR)) {
                LOG.error("Could not get local interfaces list", caught);
            }
            
            allInterfaces = Collections.enumeration(Collections.EMPTY_LIST);
        }
        
        if( null == allInterfaces ) {
            allInterfaces = Collections.enumeration(Collections.EMPTY_LIST);
        }
        
        while( allInterfaces.hasMoreElements() ) {
            NetworkInterface anInterface = (NetworkInterface) allInterfaces.nextElement();
            
            try {
                Enumeration allIntfAddr = anInterface.getInetAddresses();
                
                while( allIntfAddr.hasMoreElements() ) {
                    InetAddress anAddr = (InetAddress) allIntfAddr.nextElement();
                    
                    if( anAddr.isLoopbackAddress() )
                        continue;
                    
                    if( !allAddr.contains( anAddr ) )