/*
 * Created on 1 Nov 2006
 * Created by Paul Gardner
 * Copyright (C) 2006 Aelitis, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 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 for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 * 
 * AELITIS, SAS au capital de 63.529,40 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */


package com.aelitis.azureus.core.util;

import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.UnknownHostException;
import java.util.Enumeration;

public class 
NetUtils 
{
	public static InetAddress
	getLocalHost()
	
		throws UnknownHostException
	{
		try{
			return( InetAddress.getLocalHost());
			
		}catch( Throwable e ){
			
				// sometimes get this when changing host name
				// return first non-loopback one
			
			try{
				Enumeration 	nis = NetworkInterface.getNetworkInterfaces();

				while( nis.hasMoreElements()){
					
					NetworkInterface	 ni = (NetworkInterface)nis.nextElement();
						
					Enumeration addresses = ni.getInetAddresses();
					
					while( addresses.hasMoreElements()){
						
						InetAddress address = (InetAddress)addresses.nextElement();
						
						if ( address.isLoopbackAddress() || address instanceof Inet6Address ){
							
							continue;
						}
						
						return( address );
					}
				}
			}catch( Throwable f ){
			}
			
			return( InetAddress.getByName( "127.0.0.1" ));
		}
	}
}