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Networks that exist in serious pollution of bad information network environment, endanger the public interest , and even affect social stability . Thus, for the network of cultural regulation, for the maintenance of the network environment is very necessary . Network protocol analysis and network principle is also the basis for regulatory means culture . However, the current network protocols to restore large multifunctional single product , there are many defects on the performance of the network maintenance effect is not satisfactory . For the above situation , this paper designs and implements network content analysis and restore the system , the system can real time packet capture , protocol analysis , session reorganization and a series of application-layer protocol reduction and, ultimately, to achieve accurate reduction of network protocols . In this paper, the design and implementation of the system in the process was completed the following work: First, in the study and analysis of HTTP, SMTP, POP3 , etc. several common application layer protocol based on the rational design of protocols for each reduction programs ; Section Second, the application restore programs , design and implementation of network content analysis and restore the system. Through the system to make accurate needs analysis , reasonable structure design, and appropriate module division , making the system not only can complete the outstanding intended function , but also has good performance ; Third, the network content analysis and restore system functionality and performance was tested by testing certainly advantages of the system , but also find some room for improvement , on the basis of future work prospects . In achieving agreement restore, restore the contents of this paper constructive application layer header extraction proposed state machine , in order to correctly determine the reduced state , effectively overcome the traditional web and mail reduction in header difficult to locate , extract tedious shortcomings. In addition, the application layer content to achieve the reduction , consider the actual network communication possibilities that exist , and were to make appropriate treatment to ensure the system stability and robustness.
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