/*
* Created on Jun 11, 2009
* Created by Paul Gardner
*
* Copyright 2009 Vuze, Inc. 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; version 2 of the License only.
*
* 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.
*/
package com.aelitis.azureus.core.util;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
public class
DNSUtils
{
private static String
getFactory()
{
return( System.getProperty( "azureus.dns.context.factory", "com.sun.jndi.dns.DnsContextFactory" ));
}
public static DirContext
getInitialDirContext()
throws NamingException
{
Hashtable env = new Hashtable();
env.put ("java.naming.factory.initial", getFactory());
return( new InitialDirContext( env ));
}
public static Inet6Address
getIPV6ByName(
String host )
throws UnknownHostException
{
List<Inet6Address> all = getAllIPV6ByName( host );
return( all.get(0));
}
public static List<Inet6Address>
getAllIPV6ByName(
String host )
throws UnknownHostException
{
List<Inet6Address> result = new ArrayList<Inet6Address>();
try{
DirContext context = getInitialDirContext();
Attributes attrs = context.getAttributes( host, new String[]{ "AAAA" });
if ( attrs != null ){
Attribute attr = attrs.get( "aaaa" );
if ( attr != null ){
NamingEnumeration values = attr.getAll();
while( values.hasMore()){
Object value = values.next();
if ( value instanceof String ){
try{
result.add( (Inet6Address)InetAddress.getByName((String)value));
}catch( Throwable e ){
}
}
}
}
}
}catch( Throwable e ){
}
if ( result.size() > 0 ){
return( result );
}
throw( new UnknownHostException( host ));
}
}