CN102111402B - Method for grouping regular expression DFA - Google Patents
Method for grouping regular expression DFA Download PDFInfo
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- CN102111402B CN102111402B CN201010608744.3A CN201010608744A CN102111402B CN 102111402 B CN102111402 B CN 102111402B CN 201010608744 A CN201010608744 A CN 201010608744A CN 102111402 B CN102111402 B CN 102111402B
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Abstract
The invention provides a method for grouping regular expression deterministic finite automations (DFA). The method comprises the following steps of: A. grouping every two regular expressions to generate a state sum of every two regular expressions; B. putting all the regular expressions in a first group, and setting a failure mark as 0; C. sequencing the state sums in the step A, and finding the two regular expressions a with maximum sum in the first group; D. putting the regular expressions a in a second group; E. generating a DFA for the regular expressions of the second group, judging the failure mark if the DFA is generated successfully under the DFA state number constraint condition, turning to the step C if the failure mark is 0, and turning to the step G the failure mark is 1; if failing, putting the a in a third group, setting the failure mark as 1, and turning to the step C; F. circularly operating the steps C, D and E till sequential trail of all the regular expressions is finished; G. and putting the regular expressions in the third group into the first group, trying to generate the DFA for the first group, if succeeding, finishing grouping, and if failing, regrouping the third group and turning to the step A. By the method, least grouping of the regular expressions is realized by using a detection elimination strategy, the maximization of generating the DFA state under the DFA state number constraint is realized, and efficient matching of the regular expressions can be realized.
Description
Technical field
The present invention relates to network safety filed, be specifically related to a kind of method that canonical formula DFA is divided into groups.
Background technology
Regular expression is widely used in network information processing field, such as protocol identification, intrusion detection etc.Under DFA state number constraints, the grouping of canonical formula is generally all taked to attempt in order, to the grouping of canonical formula, generating DFA.Such grouping strategy can not obtain the minimum grouping to canonical formula, and the DFA of generation is not larger grouping, does not realize the efficient matchings of canonical formula.Especially, under the conditional condition of computer resource, this grouping strategy is utilized sometimes cannot to realize dividing into groups to all canonical formulas.The method can realize, to the maximization of DFA grouping, realizing the efficient matchings of canonical formula.
Summary of the invention
The object of the invention is to provide a kind of method of dividing into groups to canonical formula DFA.
To the method that canonical formula DFA divides into groups: comprise the following steps:
A, all canonical formulas to be divided into groups between two, generate state between any two and;
B, all canonical formulas are placed in first group, putting failure flags is 0;
C, to the state of steps A with sort, find out the canonical formula a that sum is between two maximum in the first set;
D, canonical formula a is placed in second group;
E, DFA is generated to the canonical formula of second group, if generate successfully under DFA state number constraints, judge failure flags, if be 0, forward step C to, if be 1, jump to step G; If failure, a is set to the 3rd group, putting failure flags is 1, forwards step C to;
F, cycling step C, D, E, until all canonical formulas all attempt terminating successively;
G, the canonical formula in the 3rd group to be put in first group, to attempt generating DFA to first group, if success, then divide into groups to terminate, if failure, again can divide into groups to the 3rd group, forward steps A to.
The present invention utilizes detection replacement policy, achieves the minimum grouping to canonical formula, achieves under the constraint of DFA state number, generates the maximization of DFA state, can realize the efficient matchings to canonical formula.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention
Embodiment
(1) all canonical formulas are divided into groups between two, generate state between any two and;
(2) all canonical formulas are placed in first group, putting failure flags is 0;
(3) to the state in the first step and sorting, the canonical formula a that sum is between two maximum is found out in the first set;
(4) canonical formula a is placed in second group;
(5) DFA is generated to the canonical formula of second group, if generate successfully under DFA state number constraints, judge failure flags, if be 0, forward the 3rd step to, if be 1, jump to step (7); If failure, a is set to the 3rd group, putting failure flags is 1, forwards the 3rd step to;
(6) cycling the 3rd, the 4th, the 5th step, until all canonical formulas all attempt terminating successively.
(7) the canonical formula in the 3rd group is put in first group, attempts generating DFA to first group.If generate successfully, then divide into groups to terminate, if failure can be divided into groups again to the 3rd group, forward the first step to.
Claims (1)
1. the method that the canonical formula DFA being adapted to network information processing divides into groups, is characterized in that: comprise the following steps:
A, all canonical formulas to be divided into groups between two, generate state between any two and;
B, all canonical formulas are placed in first group, putting failure flags is 0;
C, to the state of steps A with sort, find out the canonical formula a that sum is between two maximum in the first set;
D, canonical formula a is placed in second group;
E, DFA is generated to the canonical formula of second group, if generate successfully under DFA state number constraints, judge failure flags, if be 0, forward step C to, if be 1, jump to step G; If failure, a is set to the 3rd group, putting failure flags is 1, forwards step C to;
F, cycling step C, D, E, until all canonical formulas all attempt terminating successively;
G, the canonical formula in the 3rd group to be put in first group, to attempt generating DFA to first group, if success, then divide into groups to terminate, if failure, again can divide into groups to the 3rd group, forward steps A to.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010608744.3A CN102111402B (en) | 2010-12-17 | 2010-12-17 | Method for grouping regular expression DFA |
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| CN201010608744.3A CN102111402B (en) | 2010-12-17 | 2010-12-17 | Method for grouping regular expression DFA |
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| CN102111402A CN102111402A (en) | 2011-06-29 |
| CN102111402B true CN102111402B (en) | 2015-06-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102387050A (en) * | 2011-12-13 | 2012-03-21 | 曙光信息产业(北京)有限公司 | System and method utilizing automata to achieve message depth detection |
| CN105357177A (en) * | 2015-09-29 | 2016-02-24 | 西安电子科技大学 | Method for processing data packet filtering rule set and data packet matching method |
| CN105320890B (en) * | 2015-09-29 | 2019-02-22 | 国网智能电网研究院 | A kind of source code leak detection method based on grouping DFA |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1656731A (en) * | 2002-02-08 | 2005-08-17 | 杜松网络公司 | Multi-method gateway-based network security systems and methods |
| WO2007064685A2 (en) * | 2005-12-02 | 2007-06-07 | Exegy Incorporated | Method and device for high performance regular expression pattern matching |
| CN101079890A (en) * | 2007-07-04 | 2007-11-28 | 杭州华三通信技术有限公司 | A method and device for generating characteristic code and identifying status machine |
| CN101827084A (en) * | 2009-01-28 | 2010-09-08 | 丛林网络公司 | The application identification efficiently of the network equipment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1656731A (en) * | 2002-02-08 | 2005-08-17 | 杜松网络公司 | Multi-method gateway-based network security systems and methods |
| WO2007064685A2 (en) * | 2005-12-02 | 2007-06-07 | Exegy Incorporated | Method and device for high performance regular expression pattern matching |
| CN101079890A (en) * | 2007-07-04 | 2007-11-28 | 杭州华三通信技术有限公司 | A method and device for generating characteristic code and identifying status machine |
| CN101827084A (en) * | 2009-01-28 | 2010-09-08 | 丛林网络公司 | The application identification efficiently of the network equipment |
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| CN102111402A (en) | 2011-06-29 |
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Effective date of registration: 20220729 Address after: 100193 No. 36 Building, No. 8 Hospital, Wangxi Road, Haidian District, Beijing Patentee after: Dawning Information Industry (Beijing) Co.,Ltd. Patentee after: DAWNING INFORMATION INDUSTRY Co.,Ltd. Address before: 100084 Beijing Haidian District City Mill Street No. 64 Patentee before: Dawning Information Industry (Beijing) Co.,Ltd. |
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