/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat licenses this file to you 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.jboss.netty.handler.ipfilter;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipelineCoverage;
import org.jboss.netty.channel.ChannelState;
import org.jboss.netty.channel.ChannelStateEvent;
/**
* Handler that block any new connection if there are already a currently active
* channel connected with the same InetAddress (IP).<br>
* <br>
*
* Take care to not change isBlocked method except if you know what you are doing
* since it is used to test if the current closed connection is to be removed
* or not from the map of currently connected channel.
*
* @author frederic bregier
*
*/
@ChannelPipelineCoverage("all")
public class OneIpFilterHandler extends IpFilteringHandlerImpl
{
/**
* HashMap of current remote connected InetAddress
*/
private final ConcurrentMap<InetAddress, Boolean> connectedSet = new ConcurrentHashMap<InetAddress, Boolean>();
/* (non-Javadoc)
* @see org.jboss.netty.handler.ipfilter.IpFilteringHandler#accept(org.jboss.netty.channel.ChannelHandlerContext, org.jboss.netty.channel.ChannelEvent, java.net.InetSocketAddress)
*/
@Override
protected boolean accept(ChannelHandlerContext ctx, ChannelEvent e, InetSocketAddress inetSocketAddress)
throws Exception
{
InetAddress inetAddress = inetSocketAddress.getAddress();
if (connectedSet.containsKey(inetAddress))
{
return false;
}
connectedSet.put(inetAddress, Boolean.TRUE);
return true;
}
/* (non-Javadoc)
* @see org.jboss.netty.handler.ipfilter.IpFilteringHandler#handleUpstream(org.jboss.netty.channel.ChannelHandlerContext, org.jboss.netty.channel.ChannelEvent)
*/
@Override
public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e) throws Exception
{
super.handleUpstream(ctx, e);
// Try to remove entry from Map if already exists
if (e instanceof ChannelStateEvent)
{
ChannelStateEvent evt = (ChannelStateEvent) e;
if (evt.getState() == ChannelState.CONNECTED)
{
if (evt.getValue() == null)
{
// DISCONNECTED but was this channel blocked or not
if (isBlocked(ctx))
{
// remove inetsocketaddress from set since this channel was not blocked before
InetSocketAddress inetSocketAddress = (InetSocketAddress) e.getChannel().getRemoteAddress();
connectedSet.remove(inetSocketAddress.getAddress());
}
}
}
}
}
}