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* JBoss, Home of Professional Open Source
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* Copyright 2005, JBoss Inc., and individual contributors as indicated
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* by the @authors tag. See the copyright.txt in the distribution for a
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* full listing of individual contributors.
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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package org.jboss.remoting.transport;
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import java.io.IOException;
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import java.net.InetAddress;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.net.UnknownHostException;
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import java.security.AccessController;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import org.jboss.logging.Logger;
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import org.jboss.remoting.util.SecurityUtility;
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* Checks if an IP interface address is usable.
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* @author <a href="ron.sigal@jboss.com">Ron Sigal</a>
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* @version $Revision: 1.1 $
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* Copyright Jan 30, 2008
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public class AddressUtil
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private static Logger log = Logger.getLogger(AddressUtil.class);
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public static boolean checkAddress(String host) throws Exception
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return checkAddress(host, 5000);
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public static boolean checkAddress(final String host, int timeout) throws Exception
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log.trace("checking host: " + host);
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int port = PortUtil.findFreePort(host);
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InetAddress addr = getAddressByName(host);
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ServerTestThread t1 = new ServerTestThread(addr, port);
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ClientTestThread t2 = new ClientTestThread(addr, port);
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static class ServerTestThread extends Thread
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ServerTestThread(InetAddress addr, int port)
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AccessController.doPrivileged( new PrivilegedExceptionAction()
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public Object run() throws Exception
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ServerSocket ss = new ServerSocket(port, 0, addr);
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Socket s = ss.accept();
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log.trace("ServerTestThread ok: " + addr + ":" + port);
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catch (PrivilegedActionException e)
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log.trace("error in ServerTestThread", e);
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static class ClientTestThread extends Thread
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ClientTestThread(InetAddress addr, int port)
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Socket s = new Socket(addr, port);
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log.trace("ClientTestThread ok: " + addr + ":" + port);
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log.trace("error in ClientTestThread", e);
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static private InetAddress getAddressByName(final String host) throws UnknownHostException
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if (SecurityUtility.skipAccessControl())
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return InetAddress.getByName(host);
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return (InetAddress)AccessController.doPrivileged( new PrivilegedExceptionAction()
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public Object run() throws IOException
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return InetAddress.getByName(host);
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catch (PrivilegedActionException e)
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throw (UnknownHostException) e.getCause();