Course design of network sniffer design based on C language

【 explain 】 Function description ： Main functions of this leaf module .

Performance description ： Accuracy index 、 Response speed index 、 Data throughput index ……

Function description ： This module mainly realizes the capture and analysis of traffic packets , Realize the specific analysis of each layer protocol , Be able to capture and use HTTP、FTP、TELNET User name and password for protocol transmission .

Performance description ： Precision can capture every packet ; At present, the response speed can time and analyze each packet stay 100 strip printf Print /S Can be successfully completed under the flow of ; The data throughput can be in 10MB/S The environment successfully completed the analysis task

3.1.4 Input information

【 explain 】 Parameters （ Including parameter name 、 Chinese annotation 、 The default value 、 Format ）、 Format and authority of data file 、 Input frequency . Use of special input devices . Code table and basic table are used for input .

be based on pacap_next_ex() Memory data of function

3.1.5 Output information

【 explain 】 Parameters （ Including parameter name 、 Chinese annotation 、 The default value 、 Format ）、 Format of data file 、 Output frequency 、 Sample report format . Use of special output devices . Code table and basic table are used for output .

Contents of the agreement 、 Output on standard output .

Catalog

Chapter one introduction 6

Section 1 Purpose of writing 6

In the second quarter Background 6

1.2.1 System name and version number 6

1.2.2 Task proposer 6

1.2.3 Task undertakers and implementers 6

1.2.4 Users 6

1.2.5 Relationship with other subsystems 6

In the third quarter Document overview 7

1.3.1 Description of document structure 7

1.3.2 Electronic document writing tools 7

1.3.3 Define descriptions and symbols 7

1.3.4 Reference material 7

Chapter two Function Overview 8

Section 1 Naming principle of functional modules 8

In the second quarter Functional hierarchy diagram 8

In the third quarter Correspondence between function modules and departments 9

The fourth quarter, External interface of this subsystem 10

The third chapter Database design 10

Section 1 Code list 10

In the second quarter Entity set list 10

In the third quarter Correspondence between entities and tables 11

The fourth quarter, Physical data model diagram 11

Section 5 Table attribute description 13

Section 6 Data volume distribution 14

Section 7 Data storage and access analysis 14

Section 8 Security measures 14

Chapter four Functional module details 15

Section 1 modular 1 15

4.1.1 Module number and Chinese notes 15

4.1.2 Function description and performance description 15

4.1.3 Code tables and tables related to this module 15

4.1.4 Input information 15

4.1.5 Output information 15

4.1.6 Algorithm 15

4.1.7 Processing flow 16

4.1.8 Problems and limitations to be explained 16

4.1.9 Screen layout design and description 16

In the second quarter modular 2 16

In the third quarter modular 3 16