/*
* TurnServer, the OpenSource Java Solution for TURN protocol. Maintained by the
* Jitsi community (http://jitsi.org).
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jitsi.turnserver.listeners;
import java.util.logging.*;
import org.ice4j.*;
import org.ice4j.attribute.*;
import org.ice4j.message.*;
import org.ice4j.stack.*;
import org.jitsi.turnserver.stack.*;
/**
* The class that would be handling and responding to incoming ChannelBind
* requests that are validated and sends a success or error response
*
* @author Aakash Garg
*/
public class ChannelBindRequestListener
implements RequestListener
{
/**
* The <tt>Logger</tt> used by the <tt>ChannelBindRequestListener</tt> class
* and its instances for logging output.
*/
private static final Logger logger = Logger
.getLogger(ChannelBindRequestListener.class.getName());
private final TurnStack turnStack;
/**
* The indicator which determines whether this
* <tt>ChannelBindrequestListener</tt> is currently started.
*/
private boolean started = false;
/**
* Creates a new ChannelBindRequestListener
*
* @param turnStack
*/
public ChannelBindRequestListener(StunStack turnStack)
{
if (turnStack instanceof TurnStack)
{
this.turnStack = (TurnStack) turnStack;
}
else
{
throw new IllegalArgumentException("This is not a TurnStack!");
}
}
@Override
public void processRequest(StunMessageEvent evt)
throws IllegalArgumentException
{
if (logger.isLoggable(Level.FINER))
{
logger.setLevel(Level.FINEST);
// logger.finer("Received request " + evt);
}
Message message = evt.getMessage();
if (message.getMessageType() == Message.CHANNELBIND_REQUEST)
{
logger.finest("Received Channel Bind request ");
logger.finest("Event tran : "+evt.getTransactionID());
Response response = null;
TransportAddress clientAddress = evt.getRemoteAddress();
TransportAddress serverAddress = evt.getLocalAddress();
Transport transport = serverAddress.getTransport();
FiveTuple fiveTuple =
new FiveTuple(clientAddress, serverAddress, transport);
Allocation allocation
= this.turnStack.getServerAllocation(fiveTuple);
ChannelNumberAttribute channelNo =
(ChannelNumberAttribute) message.getAttribute(
Attribute.CHANNEL_NUMBER);
XorPeerAddressAttribute xorPeerAddress =
(XorPeerAddressAttribute) message
.getAttribute(Attribute.XOR_PEER_ADDRESS);
if(xorPeerAddress!=null)
{
xorPeerAddress.setAddress(xorPeerAddress.getAddress(),
evt.getTransactionID().getBytes());
}
logger.finest("Adding ChannelBind : "
+(int)(channelNo.getChannelNumber())
+", "+xorPeerAddress.getAddress());
ChannelBind channelBind = new ChannelBind(
xorPeerAddress.getAddress(),
channelNo.getChannelNumber());
Character errorCode = null;
if(channelNo==null || xorPeerAddress==null)
{
errorCode = ErrorCodeAttribute.BAD_REQUEST;
}
else if(!ChannelNumberAttribute.isValidRange(
channelNo.getChannelNumber()))
{
errorCode = ErrorCodeAttribute.BAD_REQUEST;
}
else if (allocation == null
|| allocation.isBadChannelRequest(channelBind))
{
errorCode = ErrorCodeAttribute.BAD_REQUEST;
}
else if(!TurnStack.isIPAllowed(xorPeerAddress.getAddress()))
{
errorCode = ErrorCodeAttribute.FORBIDDEN;
}
else if(!allocation.canHaveMoreChannels())
{
errorCode = ErrorCodeAttribute.INSUFFICIENT_CAPACITY;
}
if(errorCode != null)
{
logger.finest("Creating ChannelBindError response : "
+(int)errorCode);
response
= MessageFactory.createChannelBindErrorResponse(errorCode);
}
else
{
logger.finest("Creating ChannelBind sucess response");
try
{
logger.finer("Adding ChannelBind : "+channelBind);
allocation.addChannelBind(channelBind);
}
catch(IllegalArgumentException ex)
{
logger.log(Level.FINEST,ex.getMessage());
}
response = MessageFactory.createChannelBindResponse();
}
try
{
turnStack.sendResponse(evt.getTransactionID().getBytes(),
response, evt.getLocalAddress(), evt.getRemoteAddress());
}
catch (Exception e)
{
logger.log(Level.INFO, "Failed to send " + response
+ " through " + evt.getLocalAddress(), e);
// try to trigger a 500 response although if this one failed,
throw new RuntimeException("Failed to send a response", e);
}
}
else
{
return;
}
}
/**
* Starts this <tt>ChannelBindRequestListener</tt>. If it is not currently
* running, does nothing.
*/
public void start()
{
if (!started)
{
turnStack.addRequestListener(this);
started = true;
}
}
/**
* Stops this <tt>ChannelBindRequestListenerr</tt>. A stopped
* <tt>ChannelBindRequestListenerr</tt> can be restarted by calling
* {@link #start()} on it.
*/
public void stop()
{
turnStack.removeRequestListener(this);
started = false;
}
}