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A pure Java Open Source implementation of the UPnP stack backported for JDK13
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/******************************************************************
*
*	CyberHTTP for Java
*
*	Copyright (C) Satoshi Konno 2002-2003
*
*	File: HostInterface.java
*
*	Revision;
*
*	05/12/03
*		- first revision.
*	05/13/03
*		- Added support for IPv6 and loopback address.
*	02/15/04
*		- Added the following methods to set only a interface.
*		- setInterface(), getInterfaces(), hasAssignedInterface()
*	06/30/04
*		- Moved the package from org.cybergarage.http to org.cybergarage.net.
*	06/30/04
*		- Theo Beisch 
*		- Changed isUseAddress() to isUsableAddress().
*	
******************************************************************/

package org.cybergarage.net;

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.cybergarage.util.Debug;

public class HostInterface
{
	////////////////////////////////////////////////
	//	Constants
	////////////////////////////////////////////////
	
	public static boolean USE_LOOPBACK_ADDR = false;
	public static boolean USE_ONLY_IPV4_ADDR = false;
	public static boolean USE_ONLY_IPV6_ADDR = false;
	 
	////////////////////////////////////////////////
	//	Network Interfaces
	////////////////////////////////////////////////
	
	private static String ifAddress = "";
	public final static int IPV4_BITMASK =  0x0001;
	public final static int IPV6_BITMASK =  0x0010;
	public final static int LOCAL_BITMASK = 0x0100;

	public final static void setInterface(String ifaddr)
	{
		ifAddress = ifaddr;
	}
	
	public final static String getInterface()
	{
		return ifAddress;
	}
	
	private final static boolean hasAssignedInterface()
	{
		return (0 < ifAddress.length()) ? true : false;
	}
	
	////////////////////////////////////////////////
	//	Network Interfaces
	////////////////////////////////////////////////

	// Thanks for Theo Beisch (10/27/04)
	
	
	public final static int getNHostAddresses()
	{
		if (hasAssignedInterface() == true)
			return 1;
			
		try {
			// only one 
			InetAddress.getLocalHost();
			return 1;
		}
		catch(Exception e){
			Debug.warning("Unable to retrive hostname and/or IP", e);
			return 0;
		}
	}
	
	public final static String getHostAddress(int n)
	{
		if (hasAssignedInterface() == true)
			return getInterface();
		
		if (n <= 1){
			try {
				return InetAddress.getLocalHost().getHostAddress();
			} catch (UnknownHostException e) {
				Debug.warning("Unable to retrive hostname and/or IP", e);
			}
		}			
		return "";
	}


	////////////////////////////////////////////////
	//	hasIPv?Interfaces
	////////////////////////////////////////////////

	public final static boolean hasIPv4Addresses()
	{
		int addrCnt = getNHostAddresses();
		return addrCnt > 0;
	}

	////////////////////////////////////////////////
	//	hasIPv?Interfaces
	////////////////////////////////////////////////

	public final static String getIPv4Address()
	{
		int addrCnt = getNHostAddresses();
		for (int n=0; n