/*************************************************************************
* Copyright 2009-2014 Eucalyptus Systems, Inc.
*
* 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 3 of the License.
*
* 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, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
*
* This file may incorporate work covered under the following copyright
* and permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms,
* with or without modification, are permitted provided that the
* following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
* THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL,
* COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
* AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
* SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY,
* WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
* REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
* IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT
* NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
************************************************************************/
package com.eucalyptus.cloud.ws;
import com.eucalyptus.component.id.Dns;
import com.eucalyptus.configurable.ConfigurableClass;
import com.eucalyptus.configurable.ConfigurableField;
import com.eucalyptus.system.Threads;
import com.google.common.util.concurrent.SimpleTimeLimiter;
import com.google.common.util.concurrent.TimeLimiter;
import com.google.common.util.concurrent.UncheckedTimeoutException;
import org.apache.log4j.Logger;
import org.xbill.DNS.Message;
import org.xbill.DNS.Rcode;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
@ConfigurableClass( root = "dns.tcp",
description = "Handles dns TCP requests." )
public class TCPHandler extends ConnectionHandler {
@ConfigurableField( description = "Parameter controlling tcp handler timeout in seconds.", initial = "30" )
public static Integer timeout_seconds = 30;
private static Logger LOG = Logger.getLogger( TCPHandler.class );
private final Socket socket;
public TCPHandler( final Socket s ) {
this.socket = s;
}
public void run() {
try ( final Socket socket = this.socket ) {
socket.setSoTimeout( timeout_seconds * 1000 );
final TimeLimiter limiter = new SimpleTimeLimiter( Threads.lookup( Dns.class, TCPHandler.class ) );
final byte[] inBytes = limiter.callWithTimeout( new Callable<byte[]>( ) {
@Override
public byte[] call() throws Exception {
final DataInputStream inStream = new DataInputStream(socket.getInputStream());
final int inputLength = inStream.readUnsignedShort();
byte[] inBytes = new byte[inputLength];
inStream.readFully(inBytes);
return inBytes;
}
}, timeout_seconds, TimeUnit.SECONDS, false );
byte [] response = null;
try {
final Message query = new Message(inBytes);
ConnectionHandler.setLocalAndRemoteInetAddresses( socket.getLocalAddress( ), socket.getInetAddress( ) );
try {
response = generateReply(query, inBytes, inBytes.length, socket);
} catch ( RuntimeException ex ) {
response = errorMessage(query, Rcode.SERVFAIL);
throw ex;
} finally {
ConnectionHandler.clearInetAddresses( );
}
if (response == null)
return;
} catch ( IOException exception ) {
LOG.error(exception);
}
final DataOutputStream outStream = new DataOutputStream(socket.getOutputStream());
outStream.writeShort(response.length);
outStream.write(response);
outStream.flush();
} catch ( UncheckedTimeoutException e ) {
LOG.debug( "Timeout reading request." );
} catch(Exception ex) {
LOG.error(ex);
}
}
}