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随着病毒、木马、黑客攻击等问题的出现，网络安全形势日渐严峻，网络安全产品也被人们重视起来。防火墙作为最早出现的网络安全产品和使用量最大的安全产品，也受到用户和研发机构的青睐。防火墙放置在外部网络与计算机之间作为隔离设备，可以识别并屏蔽非法请求，有效防止跨越权限的数据访问。
本文先介绍了个人防火墙开发的研究现状、VC++6.0和MFC程序的一些技术特点，然后对基于包过滤个人防火墙的开发进行了详细的介绍和描述。通过本文可以清楚地看到一个普通个人防火墙的开发过程。本防火墙中，用户可以自行设定过滤规则，以达到对不同源和不同目标的IP地址、端口和协议的过滤。程序可以最小化为系统托盘图标，在后台提供数据包过滤，为用户提供保护。允许用户将当前规则保存为*.rul的文件格式，供下次使用时直接导入。同时允许添加程序于开机启动项，且用户可以设定让防火墙于启动时自动开启过滤功能并最小化隐藏，使用户使用本程序更为便捷。
关键词：个人防火墙，包过滤，网络安全，MFC
With the development of the Internet, security control equipment must be installed to ensure safety when the network involves a different level of trust. These control device are almost always some kind of firewall. With the growing problem of network security, the most users are increasingly concerning about network security products. Firewall, which is not only the first network security products but also has the most users, has been favored by users and R&D institutions. The personal firewall used in PC has largely become the protector of individual users’ security.
This article describes the development of personal firewall status, some technical characteristics of VC++6.0 and the MFC program, then gives a detailed introduction and description of a packet-filtering-based individual firewall’s development. A simple personal firewall development process can be clearly seen through this article. In the firewall, users can set their own filtering rules, in order to attain the filtering with different source IP, destination IP, source port, destination port and protocol. Program can be minimized into the system tray icon, protecting user in the background. It allows users to save the current rules into a file as *.rul. The rule file can be imported when needed. The firewall also allows users to make the program initial when system starts and start filtering when the program starts, which makes the firewall more convenient.
Keywords：Personal Firewall, Packet Filter, Network Security, MFC
目录
摘要I
AbstractII
目录III
1 绪论1
1.1 研究背景1
1.2 研究意义2
1.3 课题内容3
2 包过滤防火墙技术4
2.1 包过滤防火墙技术简介4
2.2 防火墙包过滤技术的特点5
2.3 包过滤防火墙工作原理6
2.4 数据包过滤技术8
2.5 数据包过滤类型8
2.6开发工具10
3 系统设计14
3.1 设计概要14
3.2 选项功能17
3.3 界面控制18
4 系统实现20
4.1 规则基本操作20
4.2 启动过滤24
4.3退出防火墙24
5 总结25
参考文献26
致谢27
