dnsproxylookup.java~

Java SIP

/*
 * Copyright (c) 2001 The MITRE Corporation <[e-mail]>
 *
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 * 
 * This library 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 Library General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 *
 */

/**
 * Class to provide a means to lookup DNS SRV records
 *
 */

package org.mitre.jsip;

import java.util.*;
import javax.naming.*;
import javax.naming.directory.*;

public class DNSProxyLookup {

    private static final String domainName = "mitre.org";
    private static final String dnsServer = "linus.mitre.org";

    public static SipUri getProxyUri( ) throws SipProxyException {
	
	Hashtable env = new Hashtable();
	env.put( "java.naming.factory.initial", "com.sun.jndi.dns.DnsFactoryContext" );
	env.put( "java.naming.provider.url", "dns://" + dnsServer + "/" + domainName );

	try {
	    DirContext ictx = new InitialDirContext( env );
	    
	    String sipName = "_sip." + domainName;
	    Attributes attr = ictx.getAttributes( sipName, new String [] { "SRV" } ); 
	
	    //	String proxyName = attr.get( "A" ); // ??????? should be a hostname
	    String proxyName = "stars.mitre.org";
	} catch ( NamingException ne ) {
	    throw new SipProxyException( ne.toString );
	}

	return new SipUri( "sip:" + proxyName );
    }
    
    public static void testDNSLookup() throws NamingException {
	Hashtable env = new Hashtable();
	env.put( "java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory" );
	env.put( "java.naming.provider.url", "dns://" + dnsServer + "/" + domainName );

	DirContext ictx = new InitialDirContext( env );
	
	String hostname = "stars";

	Attributes attr = ictx.getAttributes( hostname, new String [] {"A"} );

	NamingEnumeration ne = attr.getAll();
	
	for ( ; ne.hasMore(); ) {
	    Attribute at = (Attribute)ne.next();
	    System.out.println( "Found attribute: " + at.getID() );
	    String atVal = (String)at.get();
	    System.out.println( "Attribute value is " + atVal );
	}
    }

    public static void main( String [] argc ) {

	// just test
	try {
	    testDNSLookup();
	} catch ( NamingException nex ) {
	    System.err.println( "Got a problem: " + nex );
	}

	System.exit(0);
    }
}