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A Domain Name Matching Method Based on Tree Automata

A matching method and automaton technology, applied in the fields of information technology and domain names, can solve problems such as low efficiency, and achieve the effect of ensuring accuracy, avoiding hash conflicts, and saving node storage space

Active Publication Date: 2019-06-14
CHINA INTERNET NETWORK INFORMATION CENTER
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing algorithm performs byte-by-byte matching, and the CPU operation bit width of modern computer systems has generally reached 64 bits, so the existing domain name matching method is inefficient

Method used

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  • A Domain Name Matching Method Based on Tree Automata
  • A Domain Name Matching Method Based on Tree Automata
  • A Domain Name Matching Method Based on Tree Automata

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Embodiment Construction

[0030] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below through specific embodiments and accompanying drawings.

[0031] A domain name is a character string representing an IP address, consisting of several fields, each field (label) is separated by ".", such as www.sina.com. The domain name itself has obvious hierarchical structure characteristics, and the domain name matching is also carried out segmented matching with the label as the unit. For the segmentation feature of domain name matching, the present invention divides the matching process into the following steps:

[0032] 1. Fill each segment of the domain name to be matched and the pattern substring to an integer multiple of n bytes. If this segment is already an integer multiple of n bytes, no padding is required, and n depends on the minimum operation bit of the computer system Width L, the ca...

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Abstract

The invention relates to a domain name matching method based on a tree automaton. The method comprises the following steps: filling a domain name to be matched and each fragment of a model substring to integer multiples of n bytes, wherein n is equal to L divided by 8 and L is a minimum operation bit width of a computer system; then constructing the tree automaton by taking the n bytes of the model substring as units; then, sequentially executing the tree automaton of the domain name to be matched until a domain name matching is finished from a root node. By taking the n bytes as the matching units when a matching operation is carried out, the matching operation efficiency of the method is much higher than that of an existing character string matching method; the tree automaton takes a hash value as a table item storage address, and a storage space occupied by table items can be reduced; a hash collision domain is limited in a local-grade node. The domain name matching method based on the tree automaton is applicable to fixed prefix matching or fixed postfix matching of the domain name, and the matching operation of other character strings with same stratification characteristics.

Description

technical field [0001] The invention belongs to the fields of information technology and domain name technology, and in particular relates to a domain name matching method based on tree automata. Background technique [0002] With the rapid development of Internet technology, the access traffic of domain names has also increased rapidly, and the background server is required to have higher resolution capabilities and security protection capabilities. When the background server performs domain name service, it needs to match domain names, and how to quickly match domain names is the key issue. [0003] Most of the existing matching methods are string matching: the domain name to be matched is regarded as a string T, and there are n pattern substrings P1, P2, ..., Pn, and it is searched whether there is any pattern string in T. The common way to implement this type of algorithm is: firstly, n pattern strings are calculated to generate a tree structure, and the string T only n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/953G06F16/22
CPCG06F16/2255G06F16/951
Inventor 李晓东李洪涛孙云刚罗瑶武丽帅
Owner CHINA INTERNET NETWORK INFORMATION CENTER
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