自己写的sniffer程序。可以监视网络的状态、数据流动情况以及网络上传输的信息。当信息以明文的形式在网络上传输时，便可以使用网络监听的方式来进行攻击。将网络接口设置在监听模式，便可以将网上传输的源源不断的信息截获。-Write a sniffer program. Can monitor the status of the network, data flow and information transmitted over the network. When the information in the form of clear text transmission on the network, you can use network monitoring methods to carry out attacks. The network interface settings in the monitor mode, it can be a steady stream of information transmitted online intercepted.