CN114827083B - Domain name resolution method, domain name resolution system and ECS (electronic control system) recursion server - Google Patents
Domain name resolution method, domain name resolution system and ECS (electronic control system) recursion server Download PDFInfo
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Abstract
The invention discloses a domain name resolution method, a domain name resolution system and an ECS recursion server, and relates to the technical field of data communication. The domain name resolution method comprises the steps that an ECS recursion server obtains an ECS domain name request sent by a user terminal, the ECS recursion server sequentially sends iteration recursion messages which do not carry ECS information to one or more domain name servers until the ECS obtains a preset NS domain name, the ECS recursion server sends the iteration recursion messages which carry the ECS information to corresponding GSLB according to the preset NS domain name so that the GSLB can determine corresponding IP addresses according to the ECS information, the ECS recursion server receives the IP addresses sent by the GSLB, and the ECS recursion server sends the IP addresses to the terminal. The embodiment of the invention reduces the risk of user information leakage to the maximum extent and improves the safety of the system while not reducing the CDN precise scheduling.
Description
Technical Field
The present invention relates to the field of data communications technologies, and in particular, to a domain name resolution method, device, and system.
Background
With the rapid development of video services, it is a business trend for CDNs (Content Delivery Network, content delivery networks) to sink edges and achieve accurate scheduling. The LDNS system generally uses ECS (EDNS-Clinet-Subnet) protocol to carry user Subnet information to provide accurate location of the user for CDN GSLB (Global Server Load Balancing, global load balancing), so as to implement accurate scheduling of the CDN. According to the ECS protocol prototype, in the iterative process of the primary stage, the additional field of the DNS (Domain NAME SYSTEM) recursive message carries ECS information.
Disclosure of Invention
After analysis, the inventor finds that the user subnet information of the telecom operator is internal secret information, and the DNS domain name servers at all levels belong to different operation entities, so that the user subnet information is easy to leak. Moreover, ECS information is only useful for GSLB, is useless for a root server, an authority server, and other domain name servers, belongs to invalid overhead, and is easy to cause erroneous judgment.
The technical problem to be solved by the embodiment of the invention is how to improve the safety of user information and reduce the cost of domain name resolution process.
According to a first aspect of some embodiments of the present invention, there is provided a domain name resolution method, including an ECS recursion server obtaining an ECS domain name request sent by a terminal of a user, the ECS recursion server sequentially sending iterative recursion messages that do not carry ECS information to one or more domain name servers until a preset NS domain name is obtained by an ECS, the ECS recursion server sending iterative recursion messages that carry ECS information to a corresponding GSLB according to the preset NS domain name, so that the GSLB determines a corresponding IP address according to the ECS information, the ECS recursion server receiving the IP address sent by the GSLB, and the ECS recursion server sending the IP address to the terminal.
In some embodiments, the pre-set NS domain name is specified by GSLB.
In some embodiments, the domain name resolution method further comprises the steps that the ECS recursion server receives update information issued by the GSLB, wherein the update information comprises information of the updated NS domain name, and the ECS recursion server updates an NS domain name database according to the update information, wherein the NS domain name database is used for storing a preset NS domain name.
In some embodiments, the update information includes an NS domain name and an operation type, including add, modify, and delete.
In some embodiments, the ECS recursion server receives update information issued by the GSLB based on SOAP protocol.
In some embodiments, the ECS recursion server sequentially sends iterative recursion messages that do not carry ECS information to one or more domain name servers until the ECS obtains a preset NS domain name includes, for each of the one or more domain name servers, sending iterative recursion messages that do not carry ECS information to the domain name server, the ECS recursion server obtaining a domain name returned by the domain name server, and the ECS recursion server determining whether the returned domain name is located in the NS domain name database to send iterative recursion messages that do not carry ECS information to a next domain name server when the returned domain name is not located in the NS domain name database.
In some embodiments, the ECS information is subscriber subnet information.
According to a second aspect of some embodiments of the present invention, there is provided an ECS recursion server, including a request acquisition module configured to acquire an ECS domain name request sent by a terminal of a user, a message sending module configured to send iterative recursion messages carrying no ECS information to one or more domain name servers in sequence until an ECS obtains a preset NS domain name, and send the iterative recursion messages carrying the ECS information to a corresponding GSLB according to the preset NS domain name, so that the GSLB determines a corresponding IP address according to the ECS information, an IP address receiving module configured to receive the IP address sent by the GSLB, and an IP address sending module configured to send the IP address to the terminal.
In some embodiments, the ECS recursion server further comprises a domain name management module configured to receive update information issued by the GSLB, wherein the update information comprises information of updated NS domain names, and update an NS domain name database according to the update information, wherein the NS domain name database is used for storing preset NS domain names.
According to a third aspect of some embodiments of the present invention there is provided an ECS recursion server comprising a memory and a processor coupled to the memory, the processor configured to perform any one of the domain name resolution methods described above based on instructions stored in the memory.
According to a fourth aspect of some embodiments of the present invention, there is provided a domain name resolution system comprising any one of the ECS recursion servers described above, and a GSLB configured to determine a corresponding IP address based on ECS information in iterative recursion messages sent by the ECS recursion servers.
In some embodiments, the GSLB is further configured to issue update information to the ECS recursion server, wherein the update information includes information of the updated NS domain name.
According to a fifth aspect of some embodiments of the present invention, there is provided a computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements any of the domain name resolution methods described above.
Some of the embodiments of the above invention have the following advantages or benefits. By the embodiment of the invention, when a user initiates an ECS domain name request, the ECS recursion server does not need to carry ECS information before iterating to the appointed NS domain name, and after iterating to the appointed NS domain name, the ECS recursion server sends the recursion message carrying the ECS information. Thus, ECS information is passed only to GSLB that needs the information, and not to other domain name servers. The risk of user information leakage is reduced to the greatest extent while the CDN precise scheduling is not reduced, and the safety of the system is improved.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 illustrates a flow diagram of a domain name resolution method according to some embodiments of the invention.
Fig. 2 illustrates a flow diagram of a NS domain name synchronization method according to some embodiments of the invention.
Fig. 3 shows a flow diagram of a domain name resolution method according to further embodiments of the invention.
Fig. 4 illustrates a schematic diagram of the structure of an ECS recursion server according to some embodiments of the present invention.
Fig. 5 illustrates a schematic diagram of a domain name resolution system according to some embodiments of the invention.
Fig. 6 shows a schematic diagram of the structure of an ECS recursion server according to further embodiments of the present invention.
Fig. 7 shows a schematic diagram of the structure of an ECS recursion server according to further embodiments of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 illustrates a flow diagram of a domain name resolution method according to some embodiments of the invention. As shown in FIG. 1, the domain name resolution method of the embodiment includes steps S102-S110.
In step S102, the ECS recursion server acquires an ECS domain name request sent by the terminal of the user.
In step S104, the ECS recursion server sequentially sends iterative recursion messages that do not carry ECS information to one or more domain name servers until the ECS obtains a preset NS (NAME SERVER, domain name server) domain name.
For example, for each of the one or more domain name servers, the ECS recursion server sends an iterative recursion message to the domain name server that does not carry ECS information, the ECS recursion server obtains the domain name returned by the domain name server, and the ECS recursion server determines whether the returned domain name is located in the NS domain name database to send an iterative recursion message to the next domain name server that does not carry ECS information when the returned domain name is not located in the NS domain name database.
In some embodiments, the one or more domain name servers include a root domain name server or the like of a hierarchy of domain name servers or an authoritative domain name server or the like.
In some embodiments, the pre-set NS domain name is specified by GSLB. For example, the GSLB may synchronize a preset NS domain name to the ECS recursion server.
In step S106, the ECS recursion server sends an iterative recursion message carrying ECS information to the corresponding GSLB according to the preset NS domain name, so that the GSLB determines a corresponding IP (Internet Protocol, network protocol) address according to the ECS information.
In some embodiments, the ECS information is subscriber subnet information.
In step S108, the ECS recursion server receives the IP address sent by the GSLB.
In step S110, the ECS recursion server transmits the IP address to the terminal.
By the embodiment, when the user initiates the ECS domain name request, the ECS recursion server does not need to carry ECS information before iterating to the appointed NS domain name, and after iterating to the appointed NS domain name, the ECS recursion server sends the recursion message carrying ECS information. Thus, ECS information is passed only to GSLB that needs the information, and not to other domain name servers. The risk of user information leakage is reduced to the greatest extent while the CDN precise scheduling is not reduced, and the safety of the system is improved.
In some embodiments, a synchronization mechanism between the ECS recursion server and the GSLB may also be established such that the GSLB synchronizes the specified NS domain name to the ECS recursion server in time. An embodiment of the NS domain name synchronization method of the present invention is described below with reference to fig. 2.
Fig. 2 illustrates a flow diagram of a NS domain name synchronization method according to some embodiments of the invention. As shown in FIG. 2, the NS domain name synchronization method of the embodiment comprises steps S202-S204.
In step S202, the ECS recursion server receives update information issued by the GSLB, wherein the update information includes information of the updated NS domain name.
In some embodiments, the update information includes an NS domain name and an operation type, including add, modify, and delete.
For example, the sync message field sent by the GSLB to the ECS recursion server includes:
an Index identification field for identifying each record;
NsName field for carrying NS domain name characters;
an Operation field indicates the type of Operation, e.g., use value 1 for new add, use value 2 for delete, etc.
In some embodiments, the ECS recursion server receives update information issued by the GSLB based on SOAP (Simple Object Access Protocol ). By using a general SOAP protocol to realize mapping information negotiation, LDNS manufacturers of the existing network can realize seamless upgrading, so that the ECS service can be conveniently developed, and the deployment of CDN accurate service scheduling is accelerated.
In step S204, the ECS recursion server updates an NS domain name database according to the update information, where the NS domain name database is used to store a preset NS domain name.
The ECS recursion server can also send an acknowledgement to the GSLB after the update is completed.
In the process of developing a CDN precisely scheduled service, many NS domain names that are recursively to GSLB are updated gradually as the service develops. The embodiment realizes the real-time updating configuration of the NS domain name, avoids manually updating the LDNS data one by one, and greatly improves the efficiency, the real-time performance and the operability of service operation.
Fig. 3 shows a flow diagram of a domain name resolution method according to further embodiments of the invention. As shown in FIG. 3, the domain name resolution method of the embodiment includes steps S300-S318.
In step S300, the GSLB issues a preset NS domain name "m.ctcdn.com" to the ECS recursion server.
In step S302, the ue wants to access www.dd.com, and sends a request to the ECS cache to query the corresponding resolved address.
In step S304, the ECS cache finds that there is no corresponding cache, and sends an ECS recursion request to the ECS recursion server.
In step S306, the ECS recursion server sequentially sends ECS recursion requests to each level of domain name servers such as the root domain name server to execute each level of iteration process, where none of the ECS recursion requests carries ECS information if none of the returned results of each level includes a preset NS domain name.
In step S308, the ECS recursion server continues to send ECS recursion requests to the authoritative domain name server of the dd company, which also does not carry ECS information.
In step S310, the authoritative domain name server of dd company returns the NS domain name, cname= "www.dd.com.ctcdn.net", to the ECS recursion server.
In step S312, the ECS recursion server finds that the returned NS domain name is preset, and sends an ECS recursion request to the GSLB corresponding to "www.dd.com.ctcdn.net", which includes ECS information.
In step S314, the GSLB performs precise scheduling according to the ECS information, and returns a service address "9.9.9.2".
In step S316, the ECS recursion server sends "9.9.9.2" to the ECS cache.
In step S318, the ECS cache returns the resolved address "9.9.9.2" to the user terminal.
Through the above embodiments, ECS information is passed only to GSLB requiring the information, and not to other domain name servers. The risk of user information leakage is reduced to the greatest extent while the CDN precise scheduling is not reduced, and the safety of the system is improved.
An embodiment of the ECS recursion server of the present invention is described below with reference to fig. 4.
Fig. 4 illustrates a schematic diagram of the structure of an ECS recursion server according to some embodiments of the present invention. As shown in fig. 4, the ECS recursion server 400 of this embodiment includes a request acquisition module 4100 configured to acquire an ECS domain name request sent by a terminal of a user, a message sending module 4200 configured to send, in sequence, an iterative recursion message that does not carry ECS information to one or more domain name servers until the ECS obtains a preset NS domain name, and send, according to the preset NS domain name, the iterative recursion message that carries ECS information to a corresponding GSLB so that the GSLB determines a corresponding IP address according to the ECS information, an IP address receiving module 4300 configured to receive the IP address sent by the GSLB, and an IP address sending module configured to send the IP address to the terminal.
In some embodiments, the pre-set NS domain name is specified by GSLB.
In some embodiments, the ECS recursion server further comprises a domain name management module 4400 configured to receive update information issued by the GSLB, wherein the update information comprises information of updated NS domain names, and update an NS domain name database according to the update information, wherein the NS domain name database is used for storing preset NS domain names.
In some embodiments, the update information includes an NS domain name and an operation type, including add, modify, and delete.
In some embodiments, domain name management module 4400 is further configured to receive update information issued by GSLB based on SOAP protocol.
In some embodiments, the messaging module 4200 is further configured to, for each of the one or more domain name servers, send an iterative recursive message to the domain name server that does not carry ECS information, the ECS recursive server obtaining a domain name returned by the domain name server, the ECS recursive server determining whether the returned domain name is located in the NS domain name database, so as to send the iterative recursive message to the next domain name server that does not carry ECS information when the returned domain name is not located in the NS domain name database.
In some embodiments, the ECS information is subscriber subnet information.
Fig. 5 illustrates a schematic diagram of a domain name resolution system according to some embodiments of the invention. As shown in fig. 5, the domain name resolution system 50 of this embodiment includes an ECS recursion server 400 and a GSLB 500.GSLB 500 is configured to determine a corresponding IP address based on ECS information in the iterative recursion message sent by ECS recursion server 400.
In some embodiments, GSLB 500 is further configured to issue update information to ECS recursion server 400, wherein the update information includes information of the updated NS domain name.
Fig. 6 shows a schematic diagram of the structure of an ECS recursion server according to further embodiments of the present invention. As shown in fig. 6, the ECS recursion server 60 of this embodiment includes a memory 610 and a processor 620 coupled to the memory 610, the processor 620 being configured to perform the domain name resolution method of any of the preceding embodiments based on instructions stored in the memory 610.
The memory 610 may include, for example, system memory, fixed nonvolatile storage media, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), and other programs.
Fig. 7 shows a schematic diagram of the structure of an ECS recursion server according to further embodiments of the present invention. As shown in fig. 7, the ECS recursion server 70 of this embodiment includes a memory 710 and a processor 720, and may further include an input-output interface 730, a network interface 740, a storage interface 750, and the like. These interfaces 730,740,750 and the memory 710 and processor 720 may be connected by, for example, a bus 760. The input/output interface 730 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, a touch screen, etc. Network interface 740 provides a connection interface for various networking devices. Storage interface 750 provides a connection interface for external storage devices such as SD cards, U-discs, and the like.
An embodiment of the present invention also provides a computer-readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements any one of the domain name resolution methods described above.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
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