关键词： 过滤；动态连接库；Winsock 2 SPI；网络封包；协议封包
The Design of the Personal Firewall Based on Windows
Abstract
The terminal users of network are always threaten by the problems of security of network,so we need a effective tool to solve this problem.The personal firewall is one of the common tools of security. VC++ is selected to implement the personal firewall.The system has two projects mainly. One of the projects is the design of core module which can be called the project of DLL.This project implements behaviors of management and the analysis of packets of protocols. The technology of Winsock 2 SPI is used to capture of pakcets of network. After that, then the checking and filtering of the packets are done using the rules of control and management. At the beginning, the control rules build up the Hook of winsock which is used to capture the tranfer of winsock,and then it implements relative behaviors.The link of socket will be or not get through checking by the rules of control and management. The rules of control and management are set by the layer of user.Then, we should design the module of user which can be called the project of exe. It implements the interface of user and the module of communication with DLL. It provides three main interfaces, they are the watching of filtering packet, the rules of control and management and the setting of rules of control and management. Finally, it has solved the requirement of security of terminal users after the final testing and application.
