说明：  Ettercap最初设计为交换网上的sniffer，但是随着发展，它获得了越来越多的功能，成为一款有效的、灵活的中介攻击工具。它支持主动及被动的协议解析并包含了许多网络和主机特性（如OS指纹等）分析。 这里是它的源代码包
(Ettercap initially designed for the exchange of online sniffers, but with the development, it was more and more functions into one effective, flexible tools to attack the intermediary. It supports active and passive analysis and the agreement contains a number of networks and mainframe features (such as OS fingerprinting, etc.) analysis. Here is the source code)