content: // 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.cloud.agent.dhcp;
  
  import java.io.IOException;
  import java.net.DatagramPacket;
  import java.net.DatagramSocket;
  import java.net.InetAddress;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  
  
  import com.cloud.utils.concurrency.NamedThreadFactory;
  import org.apache.logging.log4j.Logger;
  import org.apache.logging.log4j.LogManager;
  
  public class DhcpProtocolParserServer extends Thread {
      protected Logger logger = LogManager.getLogger(DhcpProtocolParserServer.class);;
      protected ExecutorService _executor;
      private int dhcpServerPort = 67;
      private int bufferSize = 300;
      protected boolean _running = false;
  
      public DhcpProtocolParserServer(int workers) {
          _executor = new ThreadPoolExecutor(workers, 10 * workers, 1, TimeUnit.DAYS, new LinkedBlockingQueue<Runnable>(), new NamedThreadFactory("DhcpListener"));
          _running = true;
      }
  
      @Override
      public void run() {
          while (_running) {
              try {
                  DatagramSocket dhcpSocket = new DatagramSocket(dhcpServerPort, InetAddress.getByAddress(new byte[] {0, 0, 0, 0}));
                  dhcpSocket.setBroadcast(true);
  
                  while (true) {
                      byte[] buf = new byte[bufferSize];
                      DatagramPacket dgp = new DatagramPacket(buf, buf.length);
                      dhcpSocket.receive(dgp);
                  }
              } catch (IOException e) {
                  logger.debug(e.getMessage());
              }
          }
      }
  }
  