CN113630480B - Method for realizing DNS data isolation of multiple internet surfing channels - Google Patents
Method for realizing DNS data isolation of multiple internet surfing channels Download PDFInfo
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- CN113630480B CN113630480B CN202110898719.1A CN202110898719A CN113630480B CN 113630480 B CN113630480 B CN 113630480B CN 202110898719 A CN202110898719 A CN 202110898719A CN 113630480 B CN113630480 B CN 113630480B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000002955 isolation Methods 0.000 title claims abstract description 19
- 238000013500 data storage Methods 0.000 claims abstract description 15
- 238000007726 management method Methods 0.000 claims description 20
- 238000011144 upstream manufacturing Methods 0.000 claims description 14
- 239000000284 extract Substances 0.000 claims description 3
- 108091006146 Channels Proteins 0.000 description 19
- 101100048435 Caenorhabditis elegans unc-18 gene Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000013523 data management Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
Classifications
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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
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/255—Maintenance or indexing of mapping tables
- H04L61/2553—Binding renewal aspects, e.g. using keep-alive messages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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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
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/256—NAT traversal
- H04L61/2575—NAT traversal using address mapping retrieval, e.g. simple traversal of user datagram protocol through session traversal utilities for NAT [STUN]
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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]
Abstract
The invention discloses a method for realizing DNS data isolation of a plurality of internet surfing channels, which is characterized in that a gateway receives a DNS request of a down-hanging device by recording an IP address of the down-hanging device and a DNS address bound to an internet surfing route WAN to a configuration file; the down-hanging device sends a DNS domain name resolution request message to DNSMASQ service of the device; and the DNSMASQ service searches the corresponding DNS server address in the data storage chain table according to the IP address of the down-hanging device, so that the DNS request of the LAN side down-hanging device is forwarded from the DNS server of the binding internet route WAN. The invention is based on the existing DNSMASQ service, and the DNSMASQ service is convenient to read and easy to maintain by recording the form of the configuration file; the DNS data isolation of different internet surfing channels is realized, and the application and realization of operators in certain specific business scenes can be satisfied.
Description
Technical Field
The invention relates to the field of DNS data management, in particular to a method for realizing DNS data isolation of a plurality of internet surfing channels.
Background
DNS (Domain Name System ) is a service of the internet. The method is used as a distributed database for mapping the domain name and the IP address with each other, so that people can access the Internet more conveniently.
DNSMASQ is a lightweight, easy to use DNS service tool that can be used for IP address NAT translation when connecting to the Internet, and also as a DNS service for small networks.
The DNS service of the home gateway down-hanging device to access the Internet is realized by using DNSMASQ, and the method comprises the following steps: the home gateway down-hanging device sends a DNS domain name resolution request message to DNSMASQ service of the home gateway, and the DNSMASQ service of the home gateway receives the DNS domain name resolution request message sent by the home gateway down-hanging device.
Firstly, the DNSMASQ service searches whether the domain name accessed at this time exists in the domain names accessed before from a DNS cache of the home gateway, and if so, directly returns an IP address corresponding to the domain name to the down-hanging equipment of the home gateway; if not, the DNSMASQ service then reads the address of the upstream DNS server from the/etc/resolv.conf file, the DNSMASQ service forwards the DNS domain name resolution request message to the upstream DNS server, the upstream DNS server returns a DNS domain name resolution response message to the DNSMASQ service, and the DNSMASQ service forwards the DNS domain name resolution response message to the down-hanging device of the home gateway.
In the existing DNSMASQ DNS query method, DNSMASQ reads the address of an upstream DNS server from/etc/resolv.conf file, the address of the DNS server which is routed by default is recorded in/etc/resolv.conf file, the home gateway down-hanging device accesses the external network, and domain name resolution is forwarded from the DNS server of the default internet access channel, so that the application and realization of certain specific business scenes of operators are limited, the management of DNS data is not facilitated, and the isolation of the DNS data of a plurality of internet access channels of the home gateway cannot be met.
The invention provides a method for realizing the isolation of multiple internet access channel DNS data, which solves the problem that the prior home gateway has no isolation of the multiple internet access channel DNS data
Disclosure of Invention
The invention aims to provide a method for realizing DNS data isolation of a plurality of Internet surfing channels, which aims to solve the problems that when a home gateway configures a plurality of Internet surfing channels, a plurality of LAN ports of the home gateway are respectively bound to different Internet surfing channels and are connected by a WAN, LAN side down-hanging equipment accesses an external network, domain name resolution is forwarded from the DNS of the WAN on the default, so that the application of certain specific business scenes of an operator cannot be realized and the management is not easy.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for implementing DNS data isolation for multiple internet channels, the method comprising the steps of:
step one, powering up a home gateway, initializing a configuration file according to configuration information of equipment, then starting DNSMASQ service, reading the configuration file by the DNSMASQ service, retrieving information of the configuration file, and recording related information to a data storage linked list; the dnasq service data linked list stores the correspondence between the IP address of the LAN-side downhanging device and the DNS server address bound to the internet route WAN.
And step two, the home gateway down-hanging equipment accesses an external network, and the down-hanging equipment sends a DNS domain name resolution request message to DNSMASQ service of the equipment.
Step three, the DNSMASQ service of the device searches the domain name which has been accessed before from the DNS cache of the device to find whether the domain name which has been accessed this time exists or not.
And step four, if the accessed domain name is found in the DNS cache of the equipment, the DNSMASQ service of the equipment directly returns the IP address corresponding to the domain name to the down-hanging equipment.
And fifthly, if the accessed domain name is not found in the DNS cache of the equipment, the DNSMASQ service of the equipment extracts the original IP address of the query message from the received DNS domain name query request message.
And step six, the DNSMASQ service of the equipment reads the upstream DNS server address corresponding to the IP address from the data storage linked list according to the original IP address in the DNS domain name query request message.
Step seven, the DNSMASQ service of the equipment forwards a DNS domain name resolution request message to an upstream DNS server; the upstream DNS server returns a DNS response message to DNSMASQ service, and the DNSMASQ service forwards the DNS response message to the down-hanging device, so that the DNS domain name resolution request of the down-hanging device of the home gateway is forwarded from the DNS server of the bound internet route WAN.
The method of the invention is realized by the fact that the home gateway comprises three main functional modules: the system comprises a service configuration module, a process management module and a message processing module.
Service configuration module: when the home gateway is electrified, the service configuration module initializes a configuration file; when the home gateway LAN side down-hanging equipment is connected with the Internet or the Internet access channel of the equipment is changed, the service configuration module updates the configuration file; the service configuration module searches the port of the down-hanging device bound by the WAN on the internet, searches the MAC table by utilizing a Linux brctl command according to the port name of the down-hanging device, searches the MAC address of the down-hanging device corresponding to the port name from the MAC table, searches the IP address corresponding to the MAC address by utilizing an IP neighbor command according to the MAC address of the down-hanging device, and records the searched IP address and the DNS server address bound to the WAN on the internet to the configuration file; when the configuration file is changed, the service configuration module sends a message to the process management module through a message notification mechanism.
And the process management module is used for: the process management module will monitor the message sent to the module continuously, and when the process management module receives the message, the process management module will check which processes register the message and forward the message to the process registered with the message.
Message processing module: namely DNSMASQ service, the DNSMASQ service receives the configuration file updating message and re-reads the configuration file, analyzes the data of the configuration file, and updates the data storage linked list so that the new configuration can be timely validated.
The method of the invention records the IP address of the hanging device and the DNS address bound to the Internet surfing route WAN to the configuration file, the gateway receives the DNS request of the hanging device, and DNSMASQ service searches the corresponding DNS server address in the data storage chain table according to the IP address of the hanging device, thereby realizing the forwarding of the DNS request of the hanging device at the LAN side from the DNS server bound to the Internet surfing route WAN.
Compared with the prior art, the invention has the advantages that:
1. based on the existing DNSMASQ service, the DNSMASQ service is convenient to read and easy to maintain by recording the form of the configuration file.
2. DNS requests of the down-hanging device can be forwarded from the DNS servers of the WAN of the bound internet route, so that DNS data isolation of different internet channels is realized, and the application and realization of operators in certain specific business scenes can be met.
Drawings
Fig. 1 is a schematic flow chart of initializing a DNS data isolation data storage chain table according to the present invention.
Fig. 2 is a schematic flow chart of DNS request processing of an on-hook device by DNS data isolation dnasq service according to the present invention.
Fig. 3 is a framework diagram of a DNS data isolation function module of the present invention.
Fig. 4 is a diagram illustrating a data content correspondence structure of a configuration file according to an embodiment of the present invention.
Fig. 5 is a corresponding relationship diagram of a configuration file and a dnasq data link table in an embodiment of the present invention.
Detailed Description
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
Referring to fig. 1-3, a method for implementing DNS data isolation of multiple internet surfing channels includes the following steps:
steps S100 to S104: the home gateway is powered on, a configuration file is initialized according to configuration information of the equipment, then DNSMASQ service is started, the DNSMASQ service reads the configuration file, information of the configuration file is retrieved, and relevant information is recorded in a data storage linked list.
Specifically, the configuration file stores the IP address of the home gateway LAN-side down-hook device and the DNS server address corresponding to the LAN-side port binding to the internet-surfing routing WAN. Therefore, the DNS asq service data link table stores the correspondence between the IP address of the LAN-side down-hanging device and the DNS server address bound to the internet route WAN.
Step S200: the home gateway down-hanging device accesses the external network, and the down-hanging device sends a DNS domain name resolution request message to DNSMASQ service of the device.
Step S201: the DNSMASQ service of the device first looks up from the DNS cache of the device whether there is a domain name accessed this time from among the domain names that have been accessed before.
Step S202: if the DNS cache of the device has the accessed domain name, the DNSMASQ service of the device directly returns the IP address corresponding to the domain name to the down-hanging device.
Step S203: if the accessed domain name is not found in the DNS cache of the equipment, the DNSMASQ service of the equipment extracts the original IP address of the query message from the received DNS domain name query request message.
Step S204: and the DNSMASQ service of the equipment reads the upstream DNS server address corresponding to the IP address from the data storage linked list according to the original IP address in the DNS domain name query request message.
Step S205: the DNS asq service of the device forwards DNS domain name resolution request messages to an upstream DNS server. The upstream DNS server returns a DNS response message to DNSMASQ service, and the DNSMASQ service forwards the DNS response message to the down-hanging device, so that the DNS domain name resolution request of the down-hanging device of the home gateway is forwarded from the DNS server of the bound internet route WAN.
Specifically, implementing the method requires that the home gateway includes three main functional modules: the system comprises a service configuration module, a process management module and a message processing module.
Service configuration module S30: when the home gateway is electrified, the service configuration module initializes a configuration file; when the home gateway LAN side down-hanging equipment is connected to the Internet or the Internet access channel of the equipment is changed, the service configuration module updates the configuration file. The service configuration module searches the port of the down-hanging device bound by the WAN on the internet, searches the MAC table by utilizing a Linux brctl command according to the port name of the down-hanging device, searches the MAC address of the down-hanging device corresponding to the port name from the MAC table, searches the IP address corresponding to the MAC address by utilizing an IP neighbor command according to the MAC address of the down-hanging device, and records the searched IP address and the DNS server address bound to the WAN on the internet to the configuration file.
When the configuration file is changed, the service configuration module sends a message to the process management module through a message notification mechanism.
The process management module S31: the process management module will monitor the message sent to the module continuously, and when the process management module receives the message, the process management module will check which processes register the message and forward the message to the process registered with the message.
Message processing module S32: namely DNSMASQ service, the DNSMASQ service receives the configuration file updating message and re-reads the configuration file, analyzes the data of the configuration file, and updates the data storage linked list so that the new configuration can be timely validated.
The method includes that the IP address of the hanging device and the DNS address bound to the Internet surfing route WAN are recorded to a configuration file, the gateway receives the DNS request of the hanging device, and DNSMASQ service searches the corresponding DNS server address in the data storage linked list according to the IP address of the hanging device, so that the DNS request of the hanging device on the LAN side is forwarded from the DNS server bound to the Internet surfing route WAN.
Referring to fig. 4-5, the specific implementation is as follows:
1. the home gateway is configured with a routing WAN connection of two internet access channels, a first internet access channel binding port LAN1, LAN2, a second internet access channel binding port LAN3, ports LAN1 and LAN2 respectively hanging down PC1 and PC2, and port LAN3 hanging down PC3.
2. The address 192.168.8.2 of the DNS server acquired by the first internet surfing channel, and the address 192.168.8.3 of the DNS server acquired by the second internet surfing channel.
An address of 192.168.1.2 allocated by the lan1 down-hanging device PC1 through the DHCP server of the home gateway, an address of 192.168.1.3 allocated by the lan2 down-hanging PC2 through the DHCP server of the home gateway, and an address of 192.168.1.4 allocated by the lan3 down-hanging PC3 through the DHCP server of the home gateway.
4. The data of the configuration file is recorded in the following format:
LAN1:192.168.1.2,192.168.1.3
WAN1:192.168.8.2
LAN2:192.168.1.4
WAN2:192.168.8.3
the DNSMASQ service stores a linked list of data that is the correspondence between the IP address of the down-hanging device and the DNS server address corresponding to the up-network routing WAN.
According to the corresponding relation of the home gateway down-hanging device bound to the Internet surfing route WAN, the port name of the down-hanging device is utilized to call the Linux brctl and the IP neighbor command to search the IP address of the down-hanging device, and the IP address of the down-hanging device and the DNS server address bound to the Internet surfing route WAN are recorded to a configuration file; the DNS server uses a small and conveniently configured DNS asq service as a DNS service for the home gateway, where the DNS asq service is capable of forwarding DNS domain name resolution requests to an upstream DNS server according to the IP address of the down-set device.
While the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present patent within the knowledge of one of ordinary skill in the art.
Claims (7)
1. A method for realizing DNS data isolation of a plurality of Internet surfing channels is characterized in that a configuration file is initialized according to configuration information of a home gateway, DNSMASQ service is started, the DNSMASQ service reads the configuration file, information of the configuration file is retrieved, and related information is recorded in a data storage linked list;
the home gateway down-hanging device accesses an external network, uses the port name of the down-hanging device to call a Linux brctl and an IP neighbor command to search the IP address of the down-hanging device, and records the IP address of the down-hanging device and the DNS server address bound to the Internet route WAN to a configuration file;
the down-hanging device sends a DNS domain name resolution request message to DNSMASQ service of the device; and the DNSMASQ service searches the corresponding DNS server address in the data storage chain table according to the IP address of the down-hanging device, so that the DNS request of the LAN side down-hanging device is forwarded from the DNS server of the binding internet route WAN.
2. The method for implementing DNS data isolation of multiple internet channels according to claim 1, comprising the specific steps of:
step one, powering up a home gateway, initializing a configuration file according to configuration information of equipment, then starting DNSMASQ service, reading the configuration file by the DNSMASQ service, retrieving information of the configuration file, and recording related information to a data storage linked list;
step two, the home gateway down-hanging equipment accesses an external network, and the down-hanging equipment sends a DNS domain name resolution request message to DNSMASQ service of the equipment;
step three, the DNSMASQ service of the equipment firstly searches the domain name which is accessed before from the DNS cache of the equipment to find whether the domain name which is accessed at the time exists or not;
step four, if the accessed domain name is found in the DNS cache of the equipment, the DNSMASQ service of the equipment directly returns an IP address corresponding to the domain name to the down-hanging equipment;
step five, if the accessed domain name is not found in the DNS cache of the equipment, the DNSMASQ service of the equipment extracts the original IP address of the query message from the received DNS domain name query request message;
step six, the DNSMASQ service of the equipment reads an upstream DNS server address corresponding to the IP address from a data storage linked list according to the original IP address in the DNS domain name query request message;
step seven, the DNSMASQ service of the equipment forwards a DNS domain name resolution request message to an upstream DNS server; the upstream DNS server returns a DNS response message to DNSMASQ service, and the DNSMASQ service forwards the DNS response message to the down-hanging device, so that the DNS domain name resolution request of the down-hanging device of the home gateway is forwarded from the bound up-network by the DNS server of the WAN.
3. The method for implementing DNS data isolation for multiple internet channels according to claim 2, wherein the configuration file stores an IP address of a home gateway LAN-side down-hanging device and a DNS server address corresponding to a LAN-side port bound to an internet route WAN; therefore, the DNS asq service data link table stores the correspondence between the IP address of the LAN-side down-hanging device and the DNS server address bound to the internet route WAN.
4. A home gateway for implementing the multiple internet channel DNS data isolation method of claim 1, comprising three main functional modules: the system comprises a service configuration module, a process management module and a message processing module.
5. The home gateway of claim 4, wherein the service configuration module: when the home gateway is electrified, the service configuration module initializes a configuration file; when the home gateway LAN side down-hanging equipment is connected with the Internet or the Internet access channel of the equipment is changed, the service configuration module updates the configuration file; the service configuration module searches the port of the down-hanging device bound by the WAN on the internet, searches the MAC table by utilizing a Linux brctl command according to the port name of the down-hanging device, searches the MAC address of the down-hanging device corresponding to the port name from the MAC table, searches the IP address corresponding to the MAC address by utilizing an IP neighbor command according to the MAC address of the down-hanging device, and records the searched IP address and the DNS server address bound to the WAN on the internet to the configuration file; when the configuration file is changed, the service configuration module sends a message to the process management module through a message notification mechanism.
6. The home gateway of claim 4, wherein the process management module continues to monitor messages sent to the process management module, and when the process management module receives a message, the process management module checks which processes have registered the message and forwards the message to the process that registered the message.
7. The home gateway of claim 4, wherein the message processing module: namely DNSMASQ service, the DNSMASQ service receives the configuration file updating message and re-reads the configuration file, analyzes the data of the configuration file, and updates the data storage linked list so that the new configuration can be timely validated.
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| CN116192742A (en) * | 2022-12-15 | 2023-05-30 | 四川天邑康和通信股份有限公司 | Routing acceleration method and system based on application |
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| US9270693B2 (en) * | 2013-09-19 | 2016-02-23 | The Boeing Company | Detection of infected network devices and fast-flux networks by tracking URL and DNS resolution changes |
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