说明：  内容安排: 1.原始套接字介绍 1.1 原始套接字工作原理与规则 1.2 简单应用 2 FTP密码窃取器实现(简单的rootkit) 2.1 设计思路 2.2 实现 2.3 不足与改进之处
(Content arrangement: 1. The original socket socket to introduce the work of the original 1.1 Principle and Application of Rules 1.2 Simple 2 FTP password theft Implementation (simple rootkit) 2.1 Design 2.2 to achieve less than 2.3 and the improvements)