在对java的udp扫描方法研究时的发现

先上代码

package com.raikou.webScan;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UdpPort {

 public UdpPort() {
  super();
  // TODO Auto-generated constructor stub
 }
 public void TestUdpPort()
   {

  String ipAddress = "10.243.132.12";
  
  int port = 4 ;

     DatagramSocket connection = null;


  byte[] myByte = ipAddress.getBytes();
  String myStr = new String(myByte);

 

  try
  {
   //connection = new DatagramSocket(port, InetAddress.getByName(ipAddress));//(ipAddress, port);
   connection = new DatagramSocket();//(ipAddress, port);
   //connection.setReceiveTimeout(20*1000);
   connection.setSoTimeout(120*1000);
   connection.connect( InetAddress.getByName(ipAddress), port);
   System.out.println("连结创建完成...");
   connection.send((new DatagramPacket(myByte, myByte.length)));
   System.out.println(" 数据发送完成...");
   while(true)
   {
    byte[] newByte = new byte[4096];
    DatagramPacket dp = new DatagramPacket(newByte, 4096);
    connection.setSoTimeout(9000);
    connection.receive(dp);
    System.out.println("11");
    if (dp != null && dp.getData() != null)
    {
     System.out.println(dp.getLength());
     System.out.println("#####");
     byte[] rslt = dp.getData();
     for (int i = 0;i < dp.getLength(); i++)
     {
      System.out.println(rslt[i]);
      //System.out.println();
     }
     System.out.println("#####");
    }
    //String myDump = buffer.getHexDump();
    
    break;
   }
   connection.close();
  }
 
  catch(Exception ex1)
  {

   ex1.printStackTrace();
   
  }
  
 }
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  UdpPort up = new UdpPort();
  up.TestUdpPort();

 }

}

今天在机房运行了一下程序，意外发现在机房的xp系统下，程序是可以得出正确结果的，和nmap扫描出的结果一样。

但在win7上，扫描其他主机的UDP端口都会出现超时的情况，关闭杀软和防火墙都没用。

之后又在强大的google上搜到了另一个代码：

package com.raikou.test;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

/**
 * UDP/IP阻塞模式
 * */

public class UDPBIO {

    /**
     * 服务器端和客户端类似 
     * @param ipStr IP地址
     * @param portNum 端口号
     * */    
    
    public void udpListen(String ipStr, int portNum)
    {
        try {
            //若希望是全双工模式，则启动一个监听端口，承担服务器的职责
            //若不能绑定到指定端口，则抛出SocketException
            DatagramSocket serverSocket = new DatagramSocket(portNum);
            InetAddress server = InetAddress.getByName(ipStr);
            byte[] buffer = new byte[65507];
            DatagramPacket receivePacket = new DatagramPacket(buffer,buffer.length);
            DatagramSocket socket = new DatagramSocket();
            DatagramPacket packet = new DatagramPacket(buffer,buffer.length,server,portNum);
            
            //阻塞发送packet到指定的服务器和端口
            //网络IO异常，抛出IOExceprion
            //连不上IP和端口，抛出PortUnreachableException
            socket.send(packet);
            serverSocket.setSoTimeout(9000);
            //阻塞并同步读取流信息，如接收到的信息流比packet长，则删除更长的信息
            serverSocket.receive(receivePacket);
            /* byte[] rslt = receivePacket.getData();
             for (int i = 0;i < receivePacket.getLength(); i++)
             {
              System.out.println(rslt[i]);
              //System.out.println();
             }
             System.out.println("#####");*/
        } catch (SocketException e) {
            // 若不能绑定到指定端口
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch(Exception ex1)
          {

           ex1.printStackTrace();
           
          }
        
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        UDPBIO p = new UDPBIO();
        p.udpListen("10.243.132.73", 137);
    }

}

结果只成功了一次，之后被卡巴识别成网络攻击，然后就杯具了

一直就不成功了。

剩下的明天继续。