基于SPI的封包截获与重组技术研究

Research on the Intercept and Reform package based on SPI

在一个网页内容过滤系统中,实现数据包截获并非困难,但要把截获的数据包重组成服务器返回的网页文件需要一定的难度。本文简单阐述了Windows SPI网页数据包截获技术,并结合HTTP协议和win-sock2.0原理,提出了截获网页数据包并重组为网页文件的算法模型。最后在网络数据过滤系统中得以实现,并取得了良好的效果。

It is not difficult to intercept package in the NIFS （Network Information Filter System）, but it is anothel thing to repack intercepted packages into the HTML file which the server returned. Firstly, this paper introduces the theory of Winsock SPI package interception ; Secondly, we introduce ＇a new model used to repack the intercepted package; Finally, we apply the model in NIFS and acquires a good result.