基于局域网IP包分析软件开发（终稿）.doc

基于局域网IP包分析的软件的开发 摘 要 本文主要阐述了目前网络安全的现状、缺陷、面临的威胁，提出了相应的防范措施，并介绍了网络的常用协议。然后又介绍了WINSOCK技术和监听原理，并对最广泛的监听工具sniffer做了简单的概述。基于当前网络很多威胁都是来自与自己电脑的漏洞与自己不能够清楚的察觉到自己电脑是否正在被侵犯，虽然防火墙可以提供帮助，但它不能对低层的东西显示给大家。本文主要研究的是对局域网的数据包监听并分析，采用WINSOCK技术实现的。在此工具中主要有监听和IP数据包分析，同时可以设置规则屏蔽数据通过3大主要功能，并能通过窗体清楚的显示出来。它使人们可以每时每刻观察到进入自己电脑的数据包，并能够观察到进行数据交流时对方的IP地址和所开放的端口号，及时对信息明朗化，预防和防止黑客端口的监听。 关键词： 监听工具 winsock技术 IP数据包 Abstract This text has explained the current situation , defect , threat faced of the online security at present mainly, have put forward the corresponding precautionary measures, has introduced the daily agreement of the network. Recommend winsock technology and monitor principle , monitor to a most extensive one tool sniffer make the simple summary。On the basis of network a lot of threat to come from with ones own loophole and oneself of computer can not clear perceiving whether ones own computer is being infringed at present, though the fire wall can offer help , it cant show to the thing of the lower to everybody . Main research of this text is wrapping up and monitoring and analysing about the data of the lan, adopt wincock technology to realize.Monitor and wrap up and analyse 2 great main functions with ip data mainly in tool once, and can come out through the display that the window body is clear . Its people can observe all the time the data which enter ones own computer are chartered , and can observe the other sides ip address and end slogans opened while exchanging the data , clear to information in time, prevent the monitoring of black ports. Key words: monitor tool winsock technology ip data pack 目 录 摘 要 II Abstract III 目 录 IV 引 言 1 1 网络安全面临的威胁 2 1.1 什么是网络安全 2 1.2 网络安全隐患与威胁 2 1.3 几种常见的威胁类型 4 1.4 威胁我国网络安全的4个因素 5 2 网络协议 7 3 WINSOCK技术与监听原理 11 3.1 WINSOCK技术概述 11 3.2 局域网与以太网监听原理 14 4 sniffer 17 4.1 sniffer概述 17 4.2 怎样防范sniffer 18 5 基于WINSOCK技术捕获IP包工具的 设计与实现 22 5.1 系统概述 22 5.2 系统概要设计 22 5.3 系统主要功能介绍 24 5.4 实例分析 28 5.5 数据包首部解析 29 5.6 指定IP和端口的数据包的屏蔽 30 结 论 34 参考文献