CN112565305B - Method, system and storage medium for accessing local area network equipment by using domain name - Google Patents
Method, system and storage medium for accessing local area network equipment by using domain name Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/955—Retrieval from the web using information identifiers, e.g. uniform resource locators [URL]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4552—Lookup mechanisms between a plurality of directories; Synchronisation of directories, e.g. metadirectories
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5053—Lease time; Renewal aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
- H04L63/0227—Filtering policies
- H04L63/0236—Filtering by address, protocol, port number or service, e.g. IP-address or URL
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
- H04L63/1441—Countermeasures against malicious traffic
- H04L63/1466—Active attacks involving interception, injection, modification, spoofing of data unit addresses, e.g. hijacking, packet injection or TCP sequence number attacks
Abstract
The invention discloses a method, a system and a storage medium for accessing local area network equipment by using a domain name, wherein the method comprises the following steps: allocating a unique identifier for target equipment in a local area network, and generating a URL (uniform resource locator) containing a specific domain name by using the unique identifier; the target device sends the local area network IP address of the target device and a specific authorization code or feature code to an Internet server; the client accesses the target equipment through the URL, and the Internet server returns request response information to the client; and the client accesses the target equipment by using the request response information. The invention dynamically registers the local area network IP address of the target equipment to the Internet server through the unique identifier, and redirects the client program to the local area network IP address of the target equipment through the Internet server when the DNS interception condition is not met.
Description
Technical Field
The present invention relates to the field of local area network device access, and in particular, to a method, system and storage medium for accessing a local area network device using a domain name.
Background
The Domain Name System (DNS) is a distributed database that maps Domain names and IPs to each other. DNS resolution is an internal service that directs domain names to a web site space IP, where the web site can be conveniently accessed through the registered domain name. People are used to memorize domain names, but machines only recognize IP addresses, the domain names and the IP addresses are in one-to-one correspondence, and the conversion work between the domain names and the IP addresses is called domain name resolution. Inputting IP address in browser to browse web site, or inputting domain name to inquire web site, although the obtained contents are the same, the calling process is different, the inputting IP address directly calls the contents from host, the inputting domain name refers to the IP address pointing to the corresponding host through domain name resolution server, and then calls the contents of web site from host. The DNS interception is also called domain name interception, which means that some means obtains the resolution control right of a certain domain name, modifies the resolution result of the domain name, and causes the access to the domain name to be transferred from the original IP address to the modified specified IP, i.e. redirects the IP address.
To access lan devices, common vendor solutions typically use DNS interception techniques with a fixed domain name, e.g., a network element router will intercept the fixed domain name routerlogin. When a client in the local area network accesses the domain name, the router intercepts DNS analysis of the domain name, a DNS response request packet is constructed by using the local area network IP address of the router, and the client directly accesses the router equipment in the local area network through the IP address after receiving the DNS response. Therefore, the router user can access the router device in the local area network only by using the specific domain name without recording or viewing the IP address of the router.
Patent application with publication number CN104917838A discloses a method and system for implementing routing redirection, in which an advertisement push page is pre-stored in a router, and when an intelligent terminal establishes a connection with the router and fails to pass authentication, a user can input any character in a webpage input field, but can redirect to the advertisement push page except for a specified domain name. Meanwhile, when the page content of the advertisement push page needs to be replaced or modified, only the file under the specified path of the router needs to be replaced or modified, the browser program does not need to be modified, and convenience is brought to users.
Patent application publication No. WO2016062077a1 discloses a method and apparatus for redirecting to a Web page, intercepting DNS to virtual IP, and replacing the target virtual IP in TCP packets to the actual gateway address at the routing level. The problem that the browser DNS cache is solved, so that the condition that interception fails due to domain name resolution or the request fails due to IP change is skipped.
Patent application publication No. WO2012167538a1 discloses a method, apparatus and system for redirection, disclosing a dynamic redirect server implementation.
Patent application publication number WO2019052058a1 discloses a domain name redirection method and system, which obtains a destination device address in advance, intercepts a domain name request in a link layer packet, triggers and constructs a DNS response packet through a hook function, and returns the destination device address.
However, when the client program does not use the DNS service of the target device within the local area network, the DNS interception will not succeed. None of the above patent applications have a solution to the above problems. When the DNS interception is unsuccessful, the specific domain name points to a server on the Internet, and a target device user cannot conveniently acquire the local area network IP address of the target device, so that the target device cannot be directly accessed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method, a system and a computer readable storage medium for redirecting a user request to a local area network target device when the local area network DNS interception fails.
The invention provides a method, a system and a storage medium for accessing local area network equipment by using a domain name, and the specific scheme is as follows:
a method for accessing a local area network device using a domain name, the method comprising the steps of:
step 1, allocating a unique identifier for target equipment E to be accessed in a local area network, and generating a URL (uniform resource locator) containing a specific domain name by using the unique identifier;
step 2, the target device E sends the local area network IP address of the target device E and a specific authorization code or feature code as notification information to an Internet server S when the target device E is started, and the Internet server S stores the notification information into a database;
step 3, the client C which is positioned in the same local area network with the target equipment E sends a specific URL request to the target equipment E through the pre-allocated URL to access the target equipment E, and the URL is analyzed to the address of the internet server S at the moment;
step 4, when the internet server S receives the specific URL request, querying the database in step 2 according to the unique identifier of the target device E carried in the URL, obtaining the IP address and the authorization code or the feature code of the target device E in the local area network, and returning the IP address and the authorization code or the feature code to the client C as request response information;
and step 5, after receiving the request response information in the step 4, the client C accesses the target device E by using the IP address and the authorization code or the feature code included in the request response information.
The method further comprises: the URL in step 1 is a unique secondary domain name.
The method further comprises: the step 2 further comprises: when the target device E is reconfigured so that its local area network address changes, the target device E sends the updated local area network IP address to the internet server S again.
The method further comprises: and after the Internet server S receives the updated local area network IP address, the server updates the local area network IP address in the database.
The method further comprises: the authorization code or the feature code in step 2 may be randomly generated by the target device E, or calculated by the internet server S according to the URL in step 1, or calculated by specific information submitted when the client C connects to the internet server S.
The method further comprises: the step 5 specifically includes: the client C tries to access the local area network IP address in the request response information and sends the authorization code or the feature code; if the local area network IP address points to the target device E itself, the target device E checks if the authorization code or feature code matches the specific authorization code or feature code it announced in step 2; if the local area network IP address is matched with the target equipment E, returning the request response information to the client C, judging whether the local area network IP address points to the target equipment E after the client C receives the request response information, and if so, directly accessing the target equipment E through the local area network IP address, namely, the redirection is successful.
The method further comprises: said step 5 is followed by: and 6, if the local area network IP address in the step 5 cannot access the target equipment E, the client side cannot receive the response or only can receive the wrong response, namely the redirection fails.
The invention also discloses: a system for accessing local area network equipment by using a domain name is characterized by comprising target equipment E, a client C and an Internet server S; wherein
The target equipment E sends the local area network IP address of the target equipment E and a specific authorization code or feature code as notification information to the Internet server S when the target equipment E is started;
the client C and the target equipment E are positioned in the same local area network, and the client C sends a specific URL request to the target equipment E through the pre-allocated URL to access the target equipment E; the client C receives request response information sent by the Internet server S, and accesses the target equipment E by using the IP address and the authorization code or the feature code included in the request response information;
the Internet server S receives the notification information sent by the target equipment E and stores the notification information into a database; and the internet server S receives the specific URL request sent by the client C, queries the database according to the unique identifier of the target equipment E carried in the URL, obtains the IP address and the authorization code or the feature code of the target equipment E in the local area network, and returns the IP address and the authorization code or the feature code as request response information to the client C.
The system further comprises: and after receiving the updated local area network IP address of the target equipment E, the Internet server S updates the local area network IP address in the database.
The invention also discloses: a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method for accessing a local area network device using a domain name.
The invention has the beneficial effects that:
according to the method and the system for accessing the local area network equipment by using the domain name, disclosed by the invention, the client program can still be redirected to the local area network IP address of the target equipment when DNS interception fails. The user of the client program does not need to specially configure or remember the IP address.
Drawings
Fig. 1 is a block diagram of a method for accessing a lan device using a domain name in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a method for accessing a local area network device by using a domain name in the embodiment of the present invention.
Fig. 3 is a schematic diagram of a system for accessing a lan device using a domain name in an embodiment of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method, a system and a computer readable storage medium for redirecting a user request to a local area network target device when the local area network DNS interception fails.
The precondition for realizing the method is that the target equipment of the local area network to be accessed can be normally connected with the public Internet.
Referring to fig. 1 and 2, the present invention discloses a method for accessing a local area network device using a domain name, comprising the steps of:
step 1, allocating a unique identifier to a target device E to be accessed in a local area network, and generating a URL containing a specific domain name by using the unique identifier, so that the URL has uniqueness.
The URL of the specific domain name may be a unique secondary domain name, such as id.xx.cc, and the method of the present application may support redirection of TCP or UDP requests; a URL may also be in the form of a specific domain name followed by a specific string, such as xx.cc/id, when accessed using the HTTP protocol; when the HTTP protocol is used for access, the information related to the unique identification can also be transmitted through an HTTP request header.
The digest information of the unique identifier may be computed using an information digest function and used to construct the specific URL or HTTP request header described in step 1. The digest functions include, but are not limited to, sha 1.
And 2, the target equipment E sends the local area network IP address of the target equipment E and a specific authorization code or feature code serving as notification information to the Internet server S when the target equipment E is started, and the Internet server S stores the notification information into a database.
The authorization code or the feature code in step 2 may be randomly generated by the target device E, or calculated by the internet server S according to the URL in step 1, or calculated by specific information submitted when the client C connects to the internet server S. The authorization code or feature code obtained by using the calculation method usually participates in the calculation by using the feature information of the target device E, such as a unique identifier. Summary functions that may be used for computation include, but are not limited to, sha 1. The calculation mode can also be obtained by performing symmetric encryption and decryption on a secret key shared by the target device E and the internet server in advance.
When the target device E is reconfigured so that its local area network address changes, the target device E sends the updated local area network IP address to the internet server S again.
And after the Internet server S receives the updated local area network IP address, the server updates the local area network IP address in the database.
And 3, the client C which is positioned in the same local area network with the target equipment E sends a specific URL request to the target equipment E through the pre-allocated URL to access the target equipment E, and the URL is analyzed to the address of the Internet server S at the moment.
The client C located in the same lan as the target device E can access the target device E through a client program, such as a browser, which is not limited herein.
And 4, when the internet server S receives the specific URL request, inquiring the database in the step 2 according to the unique identifier of the target equipment E carried in the URL to obtain the IP address and the authorization code or the feature code of the target equipment E in the local area network, and returning the IP address and the authorization code or the feature code as request response information to the client C.
And step 5, after receiving the request response information in the step 4, the client C accesses the target device E by using the IP address and the authorization code or the feature code included in the request response information.
The client C tries to access the local area network IP address in the request response information and sends the authorization code or the feature code; if the local area network IP address points to the target device E itself, the target device E checks if the authorization code or feature code matches the specific authorization code or feature code it announced in step 2; if the local area network IP address is matched with the target equipment E, returning the request response information to the client C, judging whether the local area network IP address points to the target equipment E after the client C receives the request response information, and if so, directly accessing the target equipment E through the local area network IP address, namely, the redirection is successful.
And 6, if the local area network IP address in the step 5 cannot access the target equipment E, the client side cannot receive the response or only can receive the wrong response, namely the redirection fails.
As shown in fig. 3, the embodiment of the present invention discloses a system for accessing a local area network device by using a domain name, where the system includes a target device E, a client C, and an internet server S; wherein
The target equipment E sends the local area network IP address of the target equipment E and a specific authorization code or feature code as notification information to the Internet server S when the target equipment E is started;
the client C and the target equipment E are positioned in the same local area network, and the client C sends a specific URL request to the target equipment E through the pre-allocated URL to access the target equipment E; the client C receives request response information sent by the Internet server S, and accesses the target equipment E by using the IP address and the authorization code or the feature code included in the request response information;
the Internet server S receives the notification information sent by the target equipment E and stores the notification information into a database; and the internet server S receives the specific URL request sent by the client C, queries the database according to the unique identifier of the target equipment E carried in the URL, obtains the IP address and the authorization code or the feature code of the target equipment E in the local area network, and returns the IP address and the authorization code or the feature code as request response information to the client C.
And after receiving the updated local area network IP address of the target equipment E, the Internet server S updates the local area network IP address in the database.
According to an embodiment of the present invention, a computer-readable storage medium is also disclosed, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for accessing a local area network device using a domain name.
The invention provides a method, a system and a computer readable storage medium for accessing local area network equipment by using a domain name.A local area network IP address of target equipment is dynamically registered to an Internet server through a unique identifier, and a client program is redirected to the local area network IP address of the target equipment through the Internet server when a DNS interception condition is not met; by accessing the lan device through the domain name, the client program can still be redirected to the lan IP address of the target device when DNS interception fails. The user of the client program does not need to specially configure or remember the IP address.
Each functional unit in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a ReRAM, an MRAM, a PCM, a NAND Flash, a NOR Flash, a Memory, a magnetic disk, an optical disk, or other various media that can store program codes.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (5)
1. A method for accessing local area network equipment by using a domain name is characterized in that the method can still redirect a user request to local area network target equipment when local area network DNS interception fails, and the method comprises the following steps:
step 1, allocating a unique identifier for target equipment E to be accessed in a local area network, and generating a URL (uniform resource locator) containing a specific domain name by using the unique identifier;
step 2, the target device E sends the local area network IP address of the target device E and a specific authorization code or feature code as notification information to an Internet server S when the target device E is started, and the Internet server S stores the notification information into a database; the authorization code or the feature code may be randomly generated by the target device E, or calculated by the internet server S according to the URL in step 1, or calculated by feature information of the target device E submitted when the client C connects to the internet server S, or obtained by performing symmetric encryption and decryption on a secret key shared in advance by the target device E and the internet server;
step 3, the client C which is positioned in the same local area network with the target equipment E sends a specific URL request to the target equipment E through the pre-allocated URL to access the target equipment E, and the URL is analyzed to the address of the internet server S at the moment;
step 4, when the internet server S receives the specific URL request, querying the database in step 2 according to the unique identifier of the target device E carried in the URL, obtaining the IP address and the authorization code or the feature code of the target device E in the local area network, and returning the IP address and the authorization code or the feature code to the client C as request response information;
step 5, after receiving the request response information in step 4, the client C accesses the target device E by using the IP address and the authorization code or feature code included in the request response information;
the step 5 specifically includes: the client C tries to access the local area network IP address in the request response information and sends the authorization code or the feature code; if the local area network IP address points to the target device E itself, the target device E checks if the authorization code or feature code matches the specific authorization code or feature code it announced in step 2; if the local area network IP address is matched with the target equipment E, returning the request response information to the client C, judging whether the local area network IP address points to the target equipment E after the client C receives the request response information, and if so, directly accessing the target equipment E through the local area network IP address, namely, the redirection is successful;
step 6, if the local area network IP address in the step 5 can not access the target equipment E, the client side can not receive the response or can only receive the wrong response, namely the redirection fails;
wherein, the step 2 further comprises: when the target device E is reconfigured so that the local area network address of the target device E changes, the target device E sends the updated local area network IP address to the Internet server S again;
after the internet server S receives the updated local area network IP address, the server updates the local area network IP address in the database;
the local area network IP address of the target equipment is dynamically registered to an Internet server through the unique identifier, and when the DNS interception condition is not met, the client program is redirected to the local area network IP address of the target equipment through the Internet server; by accessing the lan device through the domain name, the client program can still be redirected to the lan IP address of the target device when DNS interception fails.
2. The method for accessing a lan device using a domain name according to claim 1, wherein the URL in step 1 is a unique secondary domain name.
3. A system for accessing local area network equipment by using a domain name is characterized by comprising target equipment E, a client C and an Internet server S; wherein the content of the first and second substances,
when the local area network DNS interception fails, the target equipment E sends the local area network IP address of the target equipment E and a specific authorization code or feature code as notification information to the Internet server S when the target equipment E is started; the authorization code or the feature code may be randomly generated by the target device E, or obtained by calculating feature information of the target device E submitted when the client C connects to the internet server S, or obtained by performing symmetric encryption and decryption on a secret key shared in advance by the target device E and the internet server, where when the target device E is reconfigured so that its local area network address changes, the target device E sends an updated local area network IP address to the internet server S again; if the local area network IP address points to the target device E itself, the target device E checks whether the authorization code or feature code matches the specific authorization code or feature code announced; if the client C is matched with the client C, returning request response information to the client C;
the client C and the target equipment E are positioned in the same local area network, and the client C sends a specific URL request to the target equipment E through a pre-allocated URL to access the target equipment E; the client C receives request response information sent by the Internet server S, and accesses the target equipment E by using the IP address and the authorization code or the feature code included in the request response information; the client C attempts to access the local area network IP address in the request response information and sends the authorization code or the feature code; after receiving the request response message, the client C judges whether the local area network IP address points to the target equipment E, and if so, the client C directly accesses the target equipment E through the local area network IP address;
the Internet server S receives the notification information sent by the target equipment E and stores the notification information into a database; the Internet server S receives the specific URL request sent by the client C, queries the database according to the unique identifier of the target equipment E carried in the URL, obtains the IP address and the authorization code or the feature code of the target equipment E in the local area network, and returns the IP address and the authorization code or the feature code as request response information to the client C;
after receiving the updated local area network IP address of the target equipment E, the Internet server S updates the local area network IP address in the database;
if the target equipment E cannot be accessed through the IP address of the local area network, the client side cannot receive the response or only can receive the wrong response, namely the redirection fails;
the local area network IP address of the target equipment is dynamically registered to an Internet server through the unique identifier, and when the DNS interception condition is not met, the client program is redirected to the local area network IP address of the target equipment through the Internet server; by accessing the lan device through the domain name, the client program can still be redirected to the lan IP address of the target device when DNS interception fails.
4. The system according to claim 3, wherein the internet server S updates the local area network IP address in the database after receiving the updated local area network IP address of the target device E.
5. A storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for accessing a local area network device using a domain name according to any one of claims 1 to 2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101483672A (en) * | 2009-02-16 | 2009-07-15 | 深圳华为通信技术有限公司 | Processing method, system, gateway server and mobile terminal for service information access |
| CN105357190A (en) * | 2015-10-26 | 2016-02-24 | 网宿科技股份有限公司 | Method and system for performing authentication on access request |
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| US10778684B2 (en) * | 2017-04-07 | 2020-09-15 | Citrix Systems, Inc. | Systems and methods for securely and transparently proxying SAAS applications through a cloud-hosted or on-premise network gateway for enhanced security and visibility |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483672A (en) * | 2009-02-16 | 2009-07-15 | 深圳华为通信技术有限公司 | Processing method, system, gateway server and mobile terminal for service information access |
| CN105357190A (en) * | 2015-10-26 | 2016-02-24 | 网宿科技股份有限公司 | Method and system for performing authentication on access request |
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