CN101815105B - Domain name resolution service system with intelligent buffer and service method thereof - Google Patents
Domain name resolution service system with intelligent buffer and service method thereof Download PDFInfo
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Abstract
The invention relates to a domain name resolution service system with an intelligent buffer and a service method thereof in the technical field of network service, wherein the system comprises a domain name resolution module, an intelligent buffer module, an intelligent buffer updating module, a domain name resolution mistake judgment module and a domain name resolution mistake processing module; the method comprises the update of an iterative inquiry and the intelligent buffer, the judgment of a domain name resolution mistake and the processing of the domain name resolution mistake. When a fault of a domain name authorization server at a client end occurs, a correctly resolved result of the last time of a domain name influenced by the fault can be obtained to access a website or service corresponding to the domain name, so that the network browse of a user can not be influenced by the fault of the domain name authorization server; a safeguard can be supplied for the appointed important domain name and key service, the reliability of domain name resolution service is improved, and the influence of the fault of the domain name authorization server on website or service access is greatly reduced; and the invention is transparent for the user, and the software and the configuration of the client end need not to be modified.
Description
Technical field
What the present invention relates to is the system and the method thereof in a kind of web services technologies field, specifically is a kind of domain name resolution service system and method for servicing thereof with intelligent buffer.
Background technology
Domain name system (Domain Name System; DNS) be one of the infrastructure service of internet most critical, support that it is with domain name and IP address mutual mapping for numerous network applications provide essence; Make people's access internet easily, and needn't remember complicated IP address.The reliable and stable of DNS service is the assurance that the Internet runs well, and network failure, server failure, error configurations and malicious attack etc. are to influence the stable and safe key factor of DNS service.Along with increasing sharply of Internet user and website quantity, the pressure that the DNS service is born strengthens, and fault is also more remarkable for user's influence.
When the authoritative domain name server failover or attack when can't respond query requests, the dns caching server repeated attempt is to this queries, and overtime rear line returns server failure (Server Failure, error message SERVFAIL); When the area configurations mistake of authoritative domain name server, this server can't correctly be resolved the domain name by its management, obtains the result of server failure during this domain name of user inquiring.This type of situation will cause the user can't visit the corresponding network service of this domain name.
Through existing literature search is found; One Chinese patent application number: 200610073177.X; Name is called: a kind of server end domain name analytical error control method and system; This technology has proposed a kind of domain name analytical error control method and system that can carry out the control of domain name mapping mistake at server end; This technology for domain name do not exist, inquire about be rejected, error message such as server failure, with predetermined answer data the domain name mapping result is carried out data recombination, wrong domain name is redirected to predetermined IP address.But this technology can not solve the problem of the normal online of name server fault effects user.When the domain name authorization server did not have when response or responds to server failure, above-mentioned technology was redirected to the bomp page with the user, rather than the user hopes the corresponding Website server of domain name of visiting.Because this technology can not provide the analysis result under this domain name normal condition when domain name authorization server fault, the user can't correctly visit the website of hoping visit.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, a kind of domain name resolution service system and method for servicing thereof with intelligent buffer is provided.The present invention is used for recording domain name analysis result through increasing intelligent buffer at name server, and the domain name mapping result is carried out false judgment and processing, has realized when domain name authorization server fault, making the effect that the user can this domain name of normal access.
The present invention realizes through following technical scheme:
The domain name resolution service system of the band intelligent buffer that the present invention relates to; Comprise: domain name mapping module, intelligent buffer module, intelligent buffer update module, domain name mapping false judgment module and domain name mapping fault processing module; Wherein: the domain name mapping module links to each other with the intelligent buffer update module and transmits domain name iterative query result; The domain name mapping module domain transmission name analysis result data bag that links to each other with domain name mapping false judgment module; The domain name mapping false judgment module domain transmission name analysis result data bag that links to each other with domain name mapping fault processing module; Inquiry and modification data that the intelligent buffer update module links to each other with the intelligent buffer module and transmits the intelligent buffer content, domain name mapping fault processing module links to each other with the intelligent buffer module and transmits the data query of intelligent buffer content.
Described intelligent buffer update module judges that whether the iterative query result is for not having mistake and comprising effective answer content; When not having mistake and comprising effective answer content; In intelligent buffer, search Query Name and query type in the iterative query request problem as a result; In intelligent buffer, comprise Query Name and the query type searched, then substitute this Query Name and the corresponding answer of query type in the intelligent buffer with the answer content among the iterative query result.
Described intelligent buffer module is preserved Query Name, query type, the answer content of the domain name that is protected; When domain name resolution server iterative query process receives domain name authorization server response data bag, carry out the renewal of intelligent buffer, in the domain name mapping fault processing step of domain name resolution server when the user sends analysis result, carry out the inquiry of intelligent buffer.
Described domain name mapping false judgment module judges whether in the domain name mapping result data bag of domain name mapping module output be server failure information; When being server failure message; Then export domain name mapping result data bag to described domain name mapping fault processing module, otherwise domain name mapping result data bag is sent to client.
The Query Name and the query type that whether comprise user's request in the described domain name mapping fault processing module inquiry intelligent buffer; When comprising, then with the corresponding answer reorganization domain name mapping result data bag of this Query Name and query type in the intelligent buffer and send to client.
The domain name mapping method of servicing of the band intelligent buffer that the present invention relates to may further comprise the steps:
The first step receives the domain name mapping request of client, and Query Name is judged, when Query Name belongs to the domain name of local authorized region, then answers to the client return authorization; Otherwise whether domain name and the query type of from the local dns buffer memory, searching client-requested exist, and when existing, then the result of local dns buffer memory are returned to client; Otherwise, carry out the renewal of iterative query and intelligent buffer.
Described iterative query; Specifically: server begins from root name server; The transmission user asks the iterative query request of domain name, when obtaining nomination answer (Referral Answer), then continues downward top-level domain server requests; Up to the affirmative acknowledgement (ACK) or the negative acknowledge that obtain comprising effective answer, i.e. authorization server response data packet.
The renewal of described intelligent buffer comprises that step is:
1.1) extract packet header content, request problem content and answer content in the authorization server response data packet that said iterative query process obtains;
1.2) when the packet header content for there not being mistake, and answer content carries out 1.3 when effective); Otherwise finish the renewal of intelligent buffer;
1.3) extract Query Name and query type in the request problem content, and in intelligent buffer, search this Query Name and query type;
1.4) in intelligent buffer, there are Query Name and the query type searched, substitute this Query Name and the corresponding answer content of query type in the intelligent buffer with the answer content in the authorization server response data packet; Otherwise, intelligent buffer is not made an amendment.
Second step, the domain name of request analysis is resolved, obtain domain name mapping result data bag, (Return Code RCODE), when response code is server failure, carried out for the 3rd step to the response code in the content of extraction domain name mapping result data bag packet header; Otherwise, the domain name mapping result data bag that obtains is sent to client.
The 3rd step, the domain name mapping result data bag of server failure is carried out the domain name mapping fault processing, the domain name mapping result data bag after obtaining handling, and the domain name mapping result data bag after will handling sends to client.
Described domain name mapping fault processing, specifically:
3.1) extract Query Name and query type in the request problem content in the domain name mapping result data bag of server failure;
3.2) in intelligent buffer, search 3.1) Query Name and the query type that obtain;
3.3) when having the Query Name searched and query type in the intelligent buffer; The Query Result that this Query Name and query type in the intelligent buffer is corresponding substitutes the answer of this Query Name and query type correspondence in the domain name analysis result packet, and the response code in the content of domain name mapping result data bag packet header is revised as do not have mistake; Otherwise, domain name mapping result data bag is not made amendment;
The domain name mapping result data bag of this moment is exactly the domain name mapping result data bag after handling.
Compared with prior art; The invention has the beneficial effects as follows: realized the renewal of protected domain name in the intelligent buffer; And when domain name mapping is failed, inquire about intelligent buffer, adopt the last correct answer of resolving of writing down in the intelligent buffer to send to the user as the domain name mapping result.Therefore client can obtain to receive the last correct result who resolves of domain name of fault effects when domain name authorization server fault, thereby corresponding website or the service of visit domain name makes user's network browsing can not receive the influence of authoritative domain name server fault.The domain name resolution service system of band intelligent buffer can provide safety guarantee to the important domain name and the key service of appointment, improves the domain name mapping reliability of service, significantly reduces the influence of domain name authorization server fault to website and service access; Simultaneously, this fault processing mode that does not need the client participation need not be revised the software and the configuration of client to user transparent.
Description of drawings
Fig. 1 is that domain name resolution service system of the present invention is formed sketch map;
Fig. 2 is the normal schematic flow sheet of resolving of prior art domain name;
Fig. 3 is prior art domain name authorization server fault or does not have when response domain name mapping schematic flow sheet;
Fig. 4 is embodiment method domain name authorization server fault or does not have when response domain name mapping schematic flow sheet.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described: present embodiment provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 1; The domain name resolution service system of the band intelligent buffer that present embodiment relates to; Comprise: domain name mapping module 1, intelligent buffer module 2, intelligent buffer update module 3, domain name mapping false judgment module 4 and domain name mapping fault processing module 5; Wherein: domain name mapping module 1 links to each other with intelligent buffer update module 3 and transmits domain name iterative query result; The domain name mapping module 1 domain transmission name analysis result data bag that links to each other with domain name mapping false judgment module 4; The domain name mapping false judgment module 4 domain transmission name analysis result data bag that links to each other with domain name mapping fault processing module 5, intelligent buffer update module 3 link to each other with intelligent buffer module 2 transmission intelligent buffer content inquiry and revise data, domain name mapping fault processing module 5 links to each other with intelligent buffer module 2 and transmits the data query of intelligent buffer content.
The domain name iterative query is carried out in the domain name mapping request that described domain name mapping module 1 receives from client, and produces domain name mapping result data bag.
Described intelligent buffer module 2 is preserved Query Name, query type, the answer content of the domain name that is protected; When domain name resolution server iterative query process receives domain name authorization server response data bag, carry out the renewal of intelligent buffer, in the domain name mapping fault processing step of domain name resolution server when the user sends analysis result, carry out the inquiry of intelligent buffer.
Described intelligent buffer update module 3 judges that whether the iterative query result is for not having mistake and comprising effective answer content; When not having mistake and comprising effective answer content; Then in intelligent buffer, search Query Name and query type in the iterative query request problem as a result; In intelligent buffer, comprise Query Name and the query type searched, then substitute this Query Name and the corresponding answer of query type in the intelligent buffer with the answer content among the iterative query result.
Described domain name mapping false judgment module 4 judges whether in the domain name mapping result data bag of domain name mapping module 1 output be server failure information; When being server failure message; Then export domain name analysis result packet to described domain name mapping fault processing module 5, otherwise domain name analysis result packet is sent to client;
The Query Name and the query type that whether comprise user's request in the described domain name mapping fault processing module 5 inquiry intelligent buffers; When comprising, then with the corresponding answer reorganization domain name mapping result data bag of this Query Name and query type in the intelligent buffer and send to client.
During present embodiment system start-up, from file system, read in intelligent buffer file and initialization intelligent buffer; During the present embodiment system closing, the intelligent buffer result is write that file system is preserved so that the content of preserving in the intelligent buffer when starting in the present embodiment system is not lost next time.
The domain name mapping method of servicing of the band intelligent buffer that present embodiment relates to may further comprise the steps:
The first step, system receives the domain name mapping request of client, and Query Name is judged, when Query Name belongs to the domain name of local authorized region, then answers to the client return authorization; Otherwise whether domain name and the query type of from the local dns buffer memory, searching client-requested exist, and when existing, then use the result of local dns buffer memory to return to client; Otherwise, carry out the renewal of iterative query and intelligent buffer.
Described iterative query; Specifically: server begins from root name server, sends the iterative query request that the user asks domain name, when obtaining the nomination answer; Then continue downward top-level domain server requests, up to the affirmative acknowledgement (ACK) or the negative acknowledge that obtain comprising effective answer.
The renewal of described intelligent buffer comprises that step is:
1.1) extract packet header content, request problem content and answer content in the authorization server response data packet that obtains in the iterative query;
1.2) when the packet header content for there not being mistake, and answer content then carries out 1.3 when effective); Otherwise finish the renewal of intelligent buffer;
1.3) extract Query Name and query type in the request problem content, and in intelligent buffer, search this Query Name and query type;
1.4) in intelligent buffer, there are Query Name and the query type searched, substitute this Query Name and the corresponding answer content of query type in the intelligent buffer with the answer content in the authorization server response data packet; Otherwise, intelligent buffer is not made an amendment.
In second step, the domain name mapping module is resolved the domain name of request analysis, obtains domain name mapping result data bag, extracts the response code in the content of domain name mapping result data bag packet header, when response code is server failure, carries out for the 3rd step; Otherwise, the domain name mapping result data bag that obtains is sent to client.
The 3rd step, the domain name mapping result data bag of server failure is carried out the domain name mapping fault processing, the domain name mapping result data bag after obtaining handling, and the domain name mapping result data bag after will handling sends to client.
Described domain name mapping fault processing, specifically:
3.1) extract Query Name and query type in the request problem content in the domain name mapping result data bag;
3.2) in intelligent buffer, search 3.1) Query Name and the query type that obtain;
3.3) when having the Query Name searched and query type in the intelligent buffer; The Query Result that this Query Name and query type in the intelligent buffer is corresponding substitutes the answer of this Query Name and query type correspondence in the domain name analysis result packet, and the response code in the content of domain name mapping result data bag packet header is revised as do not have mistake; Otherwise, domain name mapping result data bag is not made amendment;
The domain name mapping result data bag of this moment is exactly the domain name mapping result data bag after handling.
In order to prevent that the client-side program dns resolution is overtime before returning analysis result, present embodiment all is set to 5 seconds with dns server iterative query time-out time with to the time-out time that the user sends response.
When " www.sjtu.edu.cn " carried out domain name mapping; Adopt prior art as shown in Figure 2 under the normal condition to its schematic flow sheet of resolving; When the domain name authorization server breaks down (or not having response); Adopt prior art as shown in Figure 3 to the schematic flow sheet of its parsing, adopt this case method as shown in Figure 4 to the schematic flow sheet of its parsing, hence one can see that: when the domain name authorization server breaks down (or not having response); Can't find the corresponding network server address of request domain name after adopting the prior art client to receive wrong analysis result; And adopt present embodiment method dns server inquiry intelligent buffer (like step 9) among Fig. 4, when before the domain name that stores user's request in the intelligent buffer correct resolve as a result the time, dns server is promptly replaced the false solution analysis result of server failure with the data in the intelligent buffer; Send to client (like step 10) among Fig. 4; The user still can obtain effective domain name mapping result when the authoritative domain name server fault, and visits the corresponding webserver of this domain name.
Present embodiment system and method thereof are in the authorization server fault or when not having response; Still can the response that comprise the effective analysis result of domain name be provided for client; Solve the problem of domain name authorization server fault effects customer access network service, improved the domain name mapping reliability of service; And the domain name analytic method that this enforcement only needs to realize at server end the band intelligent buffer need not carry out any modification to client-side program and configuration, disposes easy.
Claims (5)
1. domain name resolution service system with intelligent buffer; Comprise: domain name mapping module, domain name mapping false judgment module and domain name mapping fault processing module; It is characterized in that; Also comprise: intelligent buffer module and intelligent buffer update module; Wherein: the domain name mapping module transmission domain name iterative query result that links to each other with the intelligent buffer update module, the domain name mapping module domain transmission name analysis result data bag that links to each other with domain name mapping false judgment module, the domain name mapping false judgment module domain transmission name analysis result data bag that links to each other with domain name mapping fault processing module; Inquiry and modification data that the intelligent buffer update module links to each other with the intelligent buffer module and transmits the intelligent buffer content, domain name mapping fault processing module links to each other with the intelligent buffer module and transmits the data query of intelligent buffer content;
Described intelligent buffer update module judges that whether the iterative query result is for not having mistake and comprising effective answer content; When not having mistake and comprising effective answer content; Then in intelligent buffer, search Query Name and query type in the iterative query request problem as a result; When comprising the Query Name searched and query type in the intelligent buffer, then substitute the answer of this Query Name and query type correspondence in the intelligent buffer with the answer content among the iterative query result;
Described intelligent buffer module is preserved Query Name, query type, the answer content of the domain name that is protected; When domain name resolution server iterative query process receives domain name authorization server response data bag, carry out the renewal of intelligent buffer, in the domain name mapping fault processing step of domain name resolution server when the user sends analysis result, carry out the inquiry of intelligent buffer.
2. the domain name resolution service system of band intelligent buffer according to claim 1; It is characterized in that; Described domain name mapping false judgment module judges whether in the domain name mapping result data bag of domain name mapping module output be server failure information; When being server failure message, then exporting domain name mapping result data bag to described domain name mapping fault processing module, otherwise domain name mapping result data bag is sent to client.
3. the domain name resolution service system of band intelligent buffer according to claim 1; It is characterized in that; The Query Name and the query type that whether comprise user's request in the described domain name mapping fault processing module inquiry intelligent buffer; When comprising, then with the corresponding answer reorganization domain name mapping result data bag of this Query Name and query type in the intelligent buffer and send to client.
4. the domain name mapping method of servicing with intelligent buffer is characterized in that, may further comprise the steps:
The first step receives the domain name mapping request of client, and Query Name is judged, when Query Name belongs to the domain name of local authorized region, then answers to the client return authorization; Otherwise whether domain name and the query type of from the local dns buffer memory, searching client-requested exist, and when existing, then the result of local dns buffer memory are returned to client; Otherwise, carry out the renewal of iterative query and intelligent buffer;
Second step, the domain name of request analysis is resolved, obtain domain name mapping result data bag, extract the response code in the content of domain name mapping result data bag packet header, when response code is server failure, carried out for the 3rd step; Otherwise, the domain name mapping result data bag that obtains is sent to client;
The 3rd step, the domain name mapping result data bag of server failure is carried out the domain name mapping fault processing, the domain name mapping result data bag after obtaining handling, and the domain name mapping result data bag after will handling sends to client;
Wherein, the renewal of the intelligent buffer described in the first step comprises that step is:
1.1) extract packet header content, request problem content and answer content in the authorization server response data packet that said iterative query process obtains;
1.2) when the packet header content for there not being mistake, and answer content carries out 1.3 when effective); Otherwise finish the renewal of intelligent buffer;
1.3) extract Query Name and query type in the request problem content, and in intelligent buffer, search this Query Name and query type;
1.4) in intelligent buffer, there are Query Name and the query type searched, substitute this Query Name and the corresponding answer content of query type in the intelligent buffer with the answer content in the authorization server response data packet; Otherwise, intelligent buffer is not made an amendment;
Wherein, the domain name mapping fault processing described in the 3rd step, specifically:
3.1) extract Query Name and query type in the request problem content in the domain name mapping result data bag of server failure;
3.2) in intelligent buffer, search 3.1) Query Name and the query type that obtain;
3.3) when having the Query Name searched and query type in the intelligent buffer; The Query Result that this Query Name and query type in the intelligent buffer is corresponding substitutes the answer of this Query Name and query type correspondence in the domain name analysis result packet, and the response code in the content of domain name mapping result data bag packet header is revised as do not have mistake; Otherwise, domain name mapping result data bag is not made amendment;
The domain name mapping result data bag of this moment is exactly the domain name mapping result data bag after handling.
5. the domain name mapping method of servicing of band intelligent buffer according to claim 4 is characterized in that, the iterative query described in the first step; Specifically: server begins from root name server; The transmission user asks the iterative query request of domain name, when obtaining the nomination answer, then continues downward top-level domain server requests; Up to the affirmative acknowledgement (ACK) or the negative acknowledge that obtain comprising effective answer, i.e. authorization server response data packet.
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| CN101980510B (en) * | 2010-10-08 | 2014-06-18 | 中国科学院计算机网络信息中心 | Method for processing domain name inquiry request, recurrence server and domain name system |
| CN101969478B (en) * | 2010-10-15 | 2013-03-20 | 杭州迪普科技有限公司 | Intelligent DNS message processing method and processing device |
| CN102035905B (en) * | 2010-12-17 | 2013-05-01 | 北京世纪互联宽带数据中心有限公司 | Method for obtaining visitor Local DNS (Local Domain-Name Server) |
| CN102055815B (en) * | 2010-12-17 | 2012-12-19 | 北京世纪互联宽带数据中心有限公司 | System for acquiring local domain name analyses server of caller |
| CN102035696B (en) * | 2010-12-22 | 2012-10-03 | 中国工商银行股份有限公司 | Website access performance monitoring method, device and system |
| CN102868773B (en) * | 2012-08-22 | 2015-04-15 | 北京奇虎科技有限公司 | Method, device and system for detecting domain name system (DNS) black hole hijack |
| CN103678338A (en) * | 2012-09-07 | 2014-03-26 | 中国科学院计算机网络信息中心 | Internet of things identification analytic method with intelligent cache module |
| CN103841045B (en) * | 2012-11-22 | 2017-11-21 | 中国移动通信集团公司 | A kind of internet method for caching and processing, content detection subsystem and Cache systems |
| CN103973820A (en) * | 2013-01-28 | 2014-08-06 | 深圳市快播科技有限公司 | Method for optimizing domain name system and optimized domain name system |
| CN104301346A (en) * | 2013-07-18 | 2015-01-21 | 政务和公益机构域名注册管理中心 | Caching method of DNS (Domain Name server) with negative existence |
| CN104427011B (en) * | 2013-09-02 | 2019-03-22 | 中兴通讯股份有限公司 | The method and domain name cache server of domain name mapping |
| CN103905581A (en) * | 2014-02-26 | 2014-07-02 | 曾宪钊 | DNS high-speed analytical solution based on behavior differences and matched flow class attack resistance safety solution |
| CN103957285B (en) * | 2014-04-18 | 2015-09-09 | 北京奇虎科技有限公司 | The method and system of root domain name resolution service is provided |
| CN104683501A (en) * | 2015-03-30 | 2015-06-03 | 乐视致新电子科技（天津）有限公司 | Method and device for domain name resolution |
| CN104935680B (en) * | 2015-06-18 | 2018-11-06 | 中国互联网络信息中心 | A kind of the recurrence Domain Name Service System and method of multi-layer shared buffer memory |
| US9894041B2 (en) * | 2015-09-25 | 2018-02-13 | Microsoft Technology Licensing, Llc | Secure domain name resolution in computer networks |
| CN105635341A (en) * | 2016-01-18 | 2016-06-01 | 浪潮通信信息系统有限公司 | Disaster recovery method and device based on DNS |
| CN105791461A (en) * | 2016-03-09 | 2016-07-20 | 浪潮通信信息系统有限公司 | Management method based on wrong domain name flow |
| CN106686155B (en) * | 2016-12-09 | 2020-09-29 | 北京奇虎科技有限公司 | Domain name resolution disaster tolerance method and device |
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| CN111614783A (en) * | 2020-05-29 | 2020-09-01 | 北京邮电大学 | Domain name resolution emergency response method and system |
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