Method for improving TDS protocol analysis accuracy in packet-losing environment

A protocol analysis and accuracy rate technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve problems such as sudden increase in traffic, inability to analyze Token protocol, and uncaptured network data packets, so as to achieve full acquisition and full application information effect

Active Publication Date: 2010-01-20
HANGZHOU ANHENG INFORMATION TECH CO LTD
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Problems solved by technology

[0018] In reality, for the database audit system that reassembles and parses by capturing network data packets, there are often situations where some network data packets are not captured due to t

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  • Method for improving TDS protocol analysis accuracy in packet-losing environment
  • Method for improving TDS protocol analysis accuracy in packet-losing environment
  • Method for improving TDS protocol analysis accuracy in packet-losing environment

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Embodiment Construction

[0057] The present invention provides a method for improving the correct rate of TDS protocol analysis in a packet loss environment. The core idea of ​​the present invention is to provide a method for judging incomplete application data of TDS, and use TDS half-duplex in the case of incomplete application data. According to the characteristics of communication, it realizes the method of correctly assembling TDS business data units; and provides an analysis method that can more accurately and fully extract application information from business data units with incomplete data.

[0058] Below we describe the method of the present invention in detail in conjunction with the accompanying drawings, and the specific processing flow of the method of the present invention is as follows figure 1 shown, including the following steps:

[0059] Step 1-1: The TDS parsing module receives the TCP application data.

[0060] The present invention adopts bypass mode to listen to data packet, th...

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Abstract

The invention relates to a method for improving TDS protocol analysis accuracy in a packet-losing environment. The method comprises the following steps: after receiving application data finishing TCP message recombination, a TDS protocol analysis module recognizes the generation of the packet-losing condition by extracting a TDS message header in the application data and analyzing the validity of the TDS message header; after the packet-losing condition is generated and recognized, whether following generated application data are subject to the previous transport service data unit (TDU) is judged by the characteristics of TDS half-duplex communication, thereby ensuring that the application data subject to the TDU are accurately and completely received and then concrete protocol analysis is carried out on the application data under the condition of unavailable correct assembly according to a TDS protocol when the application data in the TDU lose, and improving the accuracy of TDS protocol analysis.

Description

technical field [0001] The invention relates to the technical field of database auditing, in particular to a method for improving the correct rate of TDS protocol analysis in a packet loss environment. Background technique [0002] The tabular data stream (Tabular Data Stream abbreviation: TDS) protocol is an application layer protocol used by SYBASE and MS SQLSERVER to exchange data between the client and the server, and it is a connection-oriented service. The TDS protocol adopts a half-duplex communication method, that is, the client writes a complete request and then reads a complete response from the server, and uses a formatted Token (marker) to mark the arrangement sequence of the internal content. [0003] TDS protocol analysis should be based on correct TCP / IP packet reassembly to ensure that the application data from TCP data packets to the TDS protocol analysis module is not repeated and in the correct order; and it should be established on the correct protocol da...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L12/56H04L1/00
Inventor 范渊杨永清李凯
Owner HANGZHOU ANHENG INFORMATION TECH CO LTD
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