Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF 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 com.alibaba.dubbo.qos.server.handler; import com.alibaba.dubbo.qos.common.QosConstants; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerAdapter; import io.netty.channel.ChannelHandlerContext; import java.net.InetSocketAddress; public class LocalHostPermitHandler extends ChannelHandlerAdapter { // true means to accept foreign IP private boolean acceptForeignIp; public LocalHostPermitHandler(boolean acceptForeignIp) { this.acceptForeignIp = acceptForeignIp; } @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { if (!acceptForeignIp) { if (!((InetSocketAddress) ctx.channel().remoteAddress()).getAddress().isLoopbackAddress()) { ByteBuf cb = Unpooled.wrappedBuffer( (QosConstants.BR_STR + "Foreign Ip Not Permitted." + QosConstants.BR_STR).getBytes()); ctx.writeAndFlush(cb).addListener(ChannelFutureListener.CLOSE); } } } }