CN109842690A - A kind of DNS data update method, system and equipment - Google Patents
A kind of DNS data update method, system and equipment Download PDFInfo
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- CN109842690A CN109842690A CN201711190705.4A CN201711190705A CN109842690A CN 109842690 A CN109842690 A CN 109842690A CN 201711190705 A CN201711190705 A CN 201711190705A CN 109842690 A CN109842690 A CN 109842690A
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Abstract
The embodiment of the invention discloses a kind of DNS data update method, system and equipment, it is related to data communication field, the DNS data for the guarantee client local cache that can be simple and efficient be it is newest, avoid because the mapping relations of domain name and IP address change caused by network access fault.This method comprises: dns server gets local dns data when changing, start timer, when receiving the DNS request message of any client transmission before the time-out time of the timer expires, additional identification is added in the DNS response message for being sent to the client；The additional identification is for prompting the DNS data on dns server to change；After the client receives the DNS response message, according to the additional identification, DNS request is re-initiated to the local DNS data cached, obtains newest DNS data.
Description
Technical field
The invention belongs to data communication field more particularly to a kind of DNS data update methods, system and equipment
Background technique
Domain name system (Domain Name System, DNS), one mutually mapped on internet as domain name and IP address
A distributed data base is able to use family and more easily accesses internet, remembers can be directly read by machine without spending
IP number string, but inquired on a dns by domain name and obtain the corresponding IP address of the domain name after corresponding DNS data and reach
To the purpose of access, here it is positive effects existing for DNS.It is fast changing due to network, it saves on a dns
DNS data is not constancy, and in existing network access scenario, the mapping relations change of domain name and IP address leads to client
The case where holding service disconnection happens occasionally.
Summary of the invention
The embodiment provides a kind of DNS data update method, system and equipment, the guarantee that can be simple and efficient
The DNS data of client local cache be it is newest, avoid because network caused by the mapping relations of domain name and IP address change is visited
Ask failure.
In a first aspect, providing a kind of DNS data update method, which comprises
When dns server gets local dns data and changes, start timer, in the time-out of the timer
Between expire before receive any client transmission DNS request message when, in the DNS response message for being sent to the client
Add additional identification；The additional identification is for prompting the DNS data on dns server to change；
After the client receives the DNS response message, according to the additional identification, to the local DNS cached
Data re-initiate DNS request, obtain newest DNS data.
Second aspect, provides a kind of dns server, the dns server include timer module, message sending module and
Message receiving module,
The timer module when changing for getting local dns data, starts timer；
The message receiving module, after receiving the DNS request message that any client is sent, triggering message is sent
Module sends DNS response message；
The message sending module is responded in the DNS and is reported for sending DNS response message to any client
Additional identification is added in text；The additional identification is for prompting the DNS data on dns server to change.
The third aspect, provides a kind of client, and the client includes message sending module and message receiving module, described
Message sending module, for sending DNS request to dns server, to receive the DNS response message that the dns server is sent；
The message receiving module, the DNS response message sent for receiving the dns server, and obtain DNS number
According to；
The message sending module is also used to the additional identification carried according to the DNS response message, has cached to local
DNS data re-initiate DNS request.
Fourth aspect, provides a kind of DNS data more new system, and the system includes at least the clothes of DNS described in second aspect
Client described in business device and the third aspect.
In above scheme, after client initiates DNS request to dns server, dns server passes through in DNS response message
The middle mode for carrying additional identification informs that there are domain names and IP address mapping relations to update on client dns server, client
After receiving the DNS response message for carrying the additional identification, DNS request is re-initiated to the local DNS data cached, is obtained
Newest DNS data is taken, the mapping relations of newest domain name and IP address are obtained.It realizes to client local cache DNS data
Update.The guarantee client local cache DNS data that can be simple and efficient be it is newest, avoid because domain name and IP address are reflected
Penetrate network access fault caused by relationship changes.Meanwhile the present invention can also effectively reduce the human cost of maintenance DNS data.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of method flow diagram of DNS data update method of the embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of dns server of the embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of client of the embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of DNS data more new system of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The system architecture and business scenario of description of the embodiment of the present invention are to more clearly illustrate implementation of the present invention
The technical solution of example, does not constitute the restriction for technical solution provided in an embodiment of the present invention, those of ordinary skill in the art
It is found that technical solution provided in an embodiment of the present invention is for similar with the differentiation of system architecture and the appearance of new business scene
The technical issues of, it is equally applicable.
Domain name system (Domain Name System, DNS) generally using server/customer end (Client/Server,
Abbreviation C/S) framework, the DNS data of maintenance host domain name and IP address mapping relations in dns server.Client is to DNS service
Device sends DNS request (DNS query message), after dns server receives the request, sends the domain name comprising request to the client
And the DNS response message of the corresponding IP address of domain name, client receive domain name and the corresponding IP of domain name after the DNS response message
Address is deposited into the DNS data of local cache, realizes that user directly inputs domain name on the client, so that it may be protected in client
The corresponding IP address of the domain name is found in the DNS data deposited, and realizes the purpose for accessing corresponding webpage.The embodiment of the present invention mentions
For a kind of DNS data update method, with when solving that DNS data changes on dns server, in client local cache
The quick replacement problem of DNS data.
The method of the embodiment of the present invention is described in detail with reference to the accompanying drawing, as shown in Figure 1, the embodiment of the present invention one
A kind of DNS data update method is provided, which comprises
When step 101, dns server get local dns data and change, start timer, in the timer
Time-out time expire before receive any client transmission DNS request message when, be sent to the client DNS ring
It answers and adds additional identification in message；The additional identification is for prompting the DNS data on dns server to change；
It changes when dns server gets local dns data, this mapping relations for changing into domain name and IP address
Change, can first start a timer, the time-out time of the timer is greater than the local dns number of dns server setting
According to default life span.Client can be directed to the DNS of this DNS data after getting DNS data according to dns server
Life span TTL in response message plays timer and carries out local this DNS data aging, and the DNS that dns server is sent is rung
Answer the TTL in message to be defaulted as 3600 seconds, i.e., the ageing time of this DNS data that client locally saves just is 3600 seconds,
Therefore, the timer expiry time should be greater than 3600 seconds, when having enough in order to the client for not having enough time receiving change
Between go to update local dns caching, guarantee after DNS data changes on a dns, all clients have at least carried out one
Secondary DNS data aging realizes that the DNS data of the local cache of client is the mapping relations number of newest domain name and IP address
According to, avoid because the mapping relations of domain name and IP address change caused by network access fault.
Before the timer expiry time expires, any client initiates DNS request to dns server, at this time if the DNS
DNS data changes on server, and this usually mapping relations of domain name and IP address that change change, then the DNS service
Device adds additional identification in the DNS response message of transmission to notify that its local dns data of the client may expired, the client
After termination receives the DNS response message for carrying additional mark, DNS request is re-initiated to the local DNS data cached, is reached
The purpose of fast refresh (synchronization) local cache DNS data.
In embodiments of the present invention, timer only plays one, is cyclically updated, after timer starting, the DNS clothes
When business device gets local dns data and changes again, the timer is reset, such as: the first moment, dns server obtain
There is change to local a certain DNS data, start a timer, the time-out time setting of timer is greater than dns server sheet
The default life span of ground DNS data such as may be configured as TTL+1 seconds, and at the second moment later, another DNS data also changes
Become, then resets timer time at this time, i.e., the time-out time of timer is started again since the second moment at this time.Herein
" first ", " second " are only used for distinguishing two moment, cannot function as the limitation to the embodiment of the present invention.
In this step, additional identification addition is in the Option Code of the DNS response message header flags field.
The DNS response message that dns server is sent to client is the DNS message of standard, which operates in the 53 of UDP carrying
On number port, DNS message is made of header and data message, and additional identification adds the header in the DNS message
In attribute field, which accounts for 2 bytes, is based on DNS standard agreement, in the attribute field each bit it is as shown in table 1:
Table 1
In embodiments of the present invention, the mapping of domain name and IP address is indicated using the Option Code in attribute field
Relationship has update, and as shown in table 1, Option Code accounts for 4 bit in total, value range 0-15.Due to 0-2 value
Through being defined, 3-15 is reserved value, thus we can in reserved value it is optional one value, as the domain name on dns server
There is the mark of update with the mapping relations of IP address, for example, being that 0xf indicates domain name and IP as defined Option Code value
The mapping relations of address change.When Option Code value is 0xf in the DNS response message that then client receives, it is known that
There is the update of DNS data on dns server.It is selectable, it may be otherwise other fields not being defined of selection DNS message
Either new field changes in DNS message come the mapping indicated between domain name and IP address, herein without limitation.
After step 102, the client receive the DNS response message, according to the additional identification, delay to local
The DNS data deposited re-initiates DNS request, obtains newest DNS data, is closed with obtaining the mapping of newest domain name and IP address
System.In this step, after client receives the DNS response message for carrying additional identification, then to the local DNS data cached
DNS request is re-initiated, the domain name and IP address mapping relations of local cache are updated.It realizes and quickly updates client local cache
The purpose of DNS data.
As optimization, the method for the embodiment of the present invention further include:
When the IP address of the client local changes, IP address here can be public network IP address or interior entoilage
Location, client actively sends DNS request message to dns server, at this point, if the DNS data on the dns server changes
Become, this usually mapping relations of domain name and IP address that change change, then DNS response message of the dns server in transmission
For middle addition additional identification to notify that its local dns data of the client may be expired, client, which receives, carries additional identification
After DNS response message, DNS request need to be re-initiated to the local DNS data cached, newest DNS data be obtained, to obtain
The mapping relations of newest domain name and IP address avoid because network caused by the mapping relations of domain name and IP address change accesses
Failure.
Meanwhile client can also know on dns server whether is DNS data by way of periodically initiating DNS request
There is update, when receiving the DNS response message for carrying additional identification, DNS is re-initiated to the local DNS data cached and is asked
It asks, obtains newest DNS data, to obtain the mapping relations of newest domain name and IP address, realize to client local cache
DNS data update.
Second embodiment of the present invention provides a kind of dns servers, as shown in Fig. 2, the dns server 20 includes timer
Module 201, message sending module 202 and message receiving module 203,
The timer module 201 when changing for getting local dns data, starts timer；
The message receiving module 203 triggers message after receiving the DNS request message that any client is sent
Sending module 202 sends DNS response message；
The message sending module 202 is responded for sending DNS response message to any client in the DNS
Additional identification is added in message；The additional identification is for prompting the DNS data on dns server to change.
The time-out time of the timer is greater than the default life span of the local dns data of dns server setting.
In embodiments of the present invention, it changes when dns server gets local dns data, this change is usually domain name and IP
The mapping relations of address change, and can first start a timer, and the time-out time of the timer is greater than the dns server and sets
The default life span for the local dns data set.Client can be sent after getting DNS data according to dns server
Life span TTL in DNS response message plays timer and carries out local dns data aging, and the DNS that dns server is sent is rung
Answer the TTL in message to be defaulted as 3600 seconds, i.e., the ageing time of every DNS data that client locally saves just is 3600 seconds,
Therefore, the timer expiry time should be greater than 3600 seconds, when having enough in order to the client for not having enough time receiving change
Between go to update local dns caching, guarantee after DNS data changes on a dns, all clients have at least carried out one
Secondary DNS data aging realizes that the DNS data of the local cache of client is the mapping relations number of newest domain name and IP address
According to, avoid because the mapping relations of domain name and IP address change caused by network access fault.
Before the timer expiry time expires, any client initiates DNS request to dns server, at this time if the DNS
DNS data changes on server, and this mapping relations change for changing into domain name and IP address, then the dns server exists
Additional identification is added in the DNS response message of transmission to notify that its local dns data of the client may be expired, which terminates
After receiving the DNS response message for carrying additional mark, DNS request is re-initiated to the local DNS data cached, reaches quick
Refresh the purpose of (synchronization) local cache DNS data.
In embodiments of the present invention, timer only plays one, is cyclically updated, after timer starting, the DNS clothes
When business device gets local dns data and changes again, the timer is reset, such as: the first moment, dns server obtain
There is change to local a certain DNS data, start a timer, the time-out time setting of timer is greater than dns server sheet
The default life span of ground DNS data such as may be configured as TTL+1 seconds, and at the second moment later, another DNS data also changes
Become, then resets timer time at this time, i.e., the time-out time of timer is started again since the second moment at this time.Herein
" first ", " second " are only used for distinguishing two moment, cannot function as the limitation to the embodiment of the present invention.
In embodiments of the present invention, Option of the additional identification addition in the DNS response message header flags field
In Code.The DNS response message is the DNS message of standard, which operates on No. 53 ports of UDP carrying, DNS
Message is made of header and data message, and additional identification is added in the attribute field of the header of the DNS message.It is right
Detailed elaboration has been carried out in above implementation in the format of DNS message and the specific location of additional identification etc., this
Place repeats no more.
The embodiment of the present invention three provides a kind of client, as shown in figure 3, the client 30 includes message sending module
301 and message receiving module 302,
The message sending module 301, for sending DNS request to dns server, to receive the dns server hair
The DNS response message sent；
The message receiving module 302, the DNS response message sent for receiving the dns server, and obtain DNS
Data；
The message sending module 301 is also used to the additional identification carried according to the DNS response message, to local
The DNS data of caching re-initiates DNS request, newest DNS data is obtained to realize, to obtain newest domain name and IP address
Mapping relations.
As optimization, client provided in an embodiment of the present invention is after local ip address changes, IP address here
It can be public network IP address or internal address, actively DNS request message sent to dns server, at this point, if the DNS service
DNS data on device changes, and this mapping relations change for changing into domain name and IP address, then the dns server is being sent out
Additional identification is added in the DNS response message sent to notify that its local dns data of the client may be expired, client receives
After the DNS response message for carrying additional identification, DNS request need to be re-initiated to the local DNS data cached, obtained newest
DNS data is avoided with obtaining the mapping relations of newest domain name and IP address because the mapping relations of domain name and IP address change
Caused network access fault.
Meanwhile the client can also know that DNS data is on dns server by way of periodically initiating DNS request
It is no to have update, when receiving the DNS response message for carrying additional identification, DNS is re-initiated to the local DNS data cached
Request, obtains newest DNS data, to obtain the mapping relations of newest domain name and IP address, realizes locally slow to client
The update for the DNS data deposited.
The embodiment of the present invention four provides a kind of DNS data more new system, as shown in figure 4, the system includes at least this
Client 30 described in dns server 20 and the embodiment of the present invention three described in inventive embodiments two and client 40, it is possible to understand that
, two clients only are schematically drawn here, can also include other clients in practical application scene, not do herein
It is specific to limit.When dns server 20 gets local dns data and changes, start timer, in the time-out time of timer
When receiving the DNS request message of the transmission of client 30 before expiring, add in the DNS response message for being sent to the client 30
Add additional identification；After client 30 receives the DNS response message, DNS is re-initiated to the local DNS data cached and is asked
It asks, obtains newest DNS data, to obtain the mapping relations of newest domain name and IP address, avoid because of domain name and IP address
Mapping relations change caused by network access fault.
When the local IP address of client 30 changes, IP address here can be public network IP address or interior entoilage
Location, 30 active of client send DNS request message to dns server 20, at this point, if DNS data on the dns server 20
It changes, this mapping relations change for changing into domain name and IP address, then the dns server 20 is responded in the DNS of transmission
Additional identification is added in message to notify that its local dns data of the client 30 may be expired, it is attached that client 30 receives carrying
After the DNS response message that mark-on is known, DNS request need to be re-initiated to the local DNS data cached, obtain newest DNS number
According to obtain the mapping relations of newest domain name and IP address, avoiding changing because of the mapping relations of domain name and IP address causes
Network access fault.
Meanwhile client 30 can also know DNS data on dns server 20 by way of periodically initiating DNS request
Whether there is update, when receiving the DNS response message for carrying additional identification, the local DNS data cached is re-initiated
DNS request obtains newest DNS data, to obtain the mapping relations of newest domain name and IP address, realizes to client 30
The update of the DNS data of ground caching.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of DNS data update method, which is characterized in that the described method includes:
When dns server gets local dns data and changes, starts timer, arrived in the time-out time of the timer
When receiving the DNS request message of any client transmission before the phase, added in the DNS response message for being sent to the client
Additional identification；The additional identification is for prompting the DNS data on dns server to change；
After the client receives the DNS response message, according to the additional identification, to the local DNS data cached
DNS request is re-initiated, newest DNS data is obtained.
2. the method according to claim 1, wherein the time-out time of the timer is greater than the DNS service
The default life span of the local dns data of device setting.
3. according to the method described in claim 2, it is characterized in that, additional identification addition is in the DNS response message head
In the Option Code of facial marker field.
4. method according to claim 1-3, which is characterized in that the method also includes: when the timer
After starting, when the dns server gets local dns data and changes again, the timer is reset.
5. a kind of dns server, which is characterized in that the dns server includes timer module, message sending module and message
Receiving module,
The timer module when changing for getting local dns data, starts timer；
The message receiving module triggers message sending module after receiving the DNS request message that any client is sent
Send DNS response message；
The message sending module, for sending DNS response message to any client, in the DNS response message
Add additional identification；The additional identification is for prompting the DNS data on dns server to change.
6. dns server according to claim 5, which is characterized in that the time-out time of the timer is greater than the DNS
The default life span of the local dns data of server setting.
7. dns server according to claim 6, which is characterized in that the additional identification addition is responded in the DNS to be reported
In the Option Code of literary header flags field.
8. according to dns server described in claim 5-7, which is characterized in that the timer module is also used to when described fixed
When device starting after, when getting local dns data and changing again, reset the timer.
9. a kind of client, which is characterized in that the client includes message sending module and message receiving module,
The message sending module, for sending DNS request to dns server, to receive the DNS that the dns server is sent
Response message；
The message receiving module, the DNS response message sent for receiving the dns server, and obtain DNS data；
The message sending module is also used to the additional identification carried according to the DNS response message, to what is locally cached
DNS data re-initiates DNS request.
10. a kind of DNS data more new system, which is characterized in that it is described in any item that the system includes at least claim 5-8
Dns server and the described in any item clients of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711190705.4A CN109842690A (en) | 2017-11-24 | 2017-11-24 | A kind of DNS data update method, system and equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711190705.4A CN109842690A (en) | 2017-11-24 | 2017-11-24 | A kind of DNS data update method, system and equipment |
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| CN201711190705.4A Withdrawn CN109842690A (en) | 2017-11-24 | 2017-11-24 | A kind of DNS data update method, system and equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021081712A1 (en) * | 2019-10-28 | 2021-05-06 | 华为技术有限公司 | Dns query method and apparatus |
| CN114124893A (en) * | 2021-11-24 | 2022-03-01 | 广州方硅信息技术有限公司 | Domain name caching method, device, system, storage medium and computer equipment |
| CN115297085A (en) * | 2022-06-29 | 2022-11-04 | 北京奇艺世纪科技有限公司 | Domain name resolution updating method and device, electronic equipment and storage medium |
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| CN102984286A (en) * | 2012-11-14 | 2013-03-20 | 上海牙木通讯技术有限公司 | Method and device and system of domain name server (DNS) for buffering updating |
| CN103856569A (en) * | 2012-11-28 | 2014-06-11 | 方正宽带网络服务股份有限公司 | Method and device for synchronizing domain name system resource information |
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| CN101272407A (en) * | 2008-04-28 | 2008-09-24 | 杭州华三通信技术有限公司 | Caching detecting method, caching detecting device and detection responding device for domain name system |
| CN102984286A (en) * | 2012-11-14 | 2013-03-20 | 上海牙木通讯技术有限公司 | Method and device and system of domain name server (DNS) for buffering updating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021081712A1 (en) * | 2019-10-28 | 2021-05-06 | 华为技术有限公司 | Dns query method and apparatus |
| CN114124893A (en) * | 2021-11-24 | 2022-03-01 | 广州方硅信息技术有限公司 | Domain name caching method, device, system, storage medium and computer equipment |
| CN115297085A (en) * | 2022-06-29 | 2022-11-04 | 北京奇艺世纪科技有限公司 | Domain name resolution updating method and device, electronic equipment and storage medium |
| CN115297085B (en) * | 2022-06-29 | 2024-04-23 | 北京奇艺世纪科技有限公司 | Domain name resolution updating method and device, electronic equipment and storage medium |
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