CN103973827A - Domain name resolution method and device - Google Patents
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Abstract
The invention discloses a domain name resolution method and device. The domain name resolution device is disposed between a client and a domain name server; after recognizing multiple domain name query request messages or multiple domain name query response messages in the same domain name resolution process, the domain name resolution device intercepts redundant ones of the domain name query request messages or domain name query response messages and passes the non-redundant domain name query request messages to the domain name server or passes the non-redundant domain name query response messages to the client. Therefore, the domain name resolution method and device has the advantages that the redundant domain name query request messages or domain name query response messages can be intercepted, processing pressure of the domain name server is relieved and network bandwidth is saved.
Description
Technical field
The present invention relates to Internet protocol (IP) field, particularly a kind of domain name analytic method and device.
Background technology
Domain name system (DNS) is the corresponding relation in order to solve domain name and IP address information and the internet name service system set up, it is the basic service system of the nearly all internet, applications such as file transfer applications and e-mail applications based on HTTP(Hypertext Transport Protocol) in the Internet, wherein, domain name is exactly the Hostname of each client in the Internet.Domain name mapping process is: the name server in domain name mapping device and the DNS arranging in client is mutual, initiated after inquiry of the domain name request message to name server by the domain name mapping device of setting in client, by name server, IP address information corresponding this domain name is returned to client, IP address information corresponding to this domain name can be one or more.
Accept the operating system management of client at the domain name mapping device of client setting, for application call that need to domain name service, to IP address information corresponding to name server nslookup and result is returned to the application program of calling it.Name server in DNS is arranged in Internet, comprise multiple and multiple grades, be responsible for concrete domain name mapping, higher level's name server has network unified management of one's own by resource management agent, and interconnected with carrier network, the name server of subordinate is arranged in carrier network, by carrier network owner control and management.
In order to alleviate the burden of higher level's name server, accelerate domain name mapping processing speed, the name server of minimum one-level is set to recursion server, and namely caching server is cached with the domain name of client and the corresponding relation of IP address information of its administration.In domain name mapping process, the name server of the minimum one-level nearest apart from client, directly and the message of the domain name mapping device interaction area name analysis of client.The name server that the application mentions is exactly the name server of minimum one-level.
At present, between the domain name mapping device of client and name server, carry out in the process of domain name mapping, the message interaction of a domain name mapping, the domain name mapping device of client may send multiple inquiry of the domain name request messages, these messages are that a same domain name mapping device of same application calls generation, to IP address information corresponding to the same domain name of same name server request, same name server will return to multiple inquiry of the domain name response messages that carry corresponding IP address information.
The domain name analytic method flow chart that Fig. 1 provides for prior art, its concrete steps are:
The domain name mapping device that the application call client of step 101, client arranges, carries out domain name mapping;
The domain name mapping device of step 102, client setting is accepted after calling of this application program, sends inquiry of the domain name request message to name server, and this example sends altogether inquiry request message four times;
In this step, the domain name that inquiry of the domain name request is carried is www.abc.com, due to the domain name mapping behavior of application program or operating system itself, need to send inquiry of the domain name request message four times; Step 103, name server receive four inquiry of the domain name request messages, resolve respectively, obtain IP address information corresponding to domain name that corresponding each inquiry of the domain name request message carries;
In this step, name server is cached with the corresponding relation of domain name and IP address information in advance, resolves according to corresponding relation;
Step 104, name server, for each inquiry of the domain name request message, return to corresponding inquiry of the domain name response message, carry and resolve the IP address information obtaining;
In this step, need to return to altogether four inquiry of the domain name response messages.
As can be seen from Figure 1, the feature that these four inquiry request messages have is: owing to coming from same client, so source IP address information is identical; Because the object sending is all name server, so object IP address information is identical; The domain name of asking is identical; The IP address information of resolving is identical; The source port of the domain name mapping device calling is identical; And the Transaction Identifier (Transaction ID) causing due to a same resolving is identical.
Under normal circumstances, these inquiry of the domain name request messages all can arrive name server, and name server also can be replied inquiry of the domain name response message to each inquiry of the domain name request message, and therefore, client also can receive multiple inquiry of the domain name response messages.In general, the mutual domain name mapping process that just can complete a time of inquiry of the domain name request message and inquiry of the domain name response message, and at client to finishing this domain name mapping process after first inquiry of the domain name response message and close the transport layer port of client, follow-up other inquiry of the domain name response messages will abandon and send the Internet Internet Control Message Protocol (ICMP) port unreachable message to name server.The inquiry of the domain name request message that these are unnecessary and inquiry of the domain name response message have increased the processing pressure of name server, have also wasted the network bandwidth, especially more obvious under the mobile access environment of network bandwidth of air-interface resource anxiety.
Summary of the invention
In view of this, the invention provides a kind of domain name analytic method, the method can, to the inquiry of the domain name response message interception of the inquiry of the domain name request message of redundancy or redundancy, alleviate name server processing pressure and save the network bandwidth.
The present invention goes back a kind of domain name mapping device for body, and this device can, to the inquiry of the domain name response message interception of the inquiry of the domain name request message of redundancy or redundancy, alleviate name server processing pressure and save the network bandwidth.
For achieving the above object, technical scheme of the invention process is specifically achieved in that
A kind of domain name analytic method arranges domain name mapping device between client and name server, and the method also comprises:
Domain name mapping device is identified the multiple inquiry of the domain name request messages that sent by client in same domain name mapping process or the multiple inquiry of the domain name response messages that sent by name server;
Domain name mapping device is tackled wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy, the nonredundant inquiry of the domain name request message of transparent transmission or nonredundant inquiry of the domain name response message.
The multiple inquiry of the domain name request messages that sent by client in the same domain name mapping process of described identification or the multiple inquiry of the domain name response messages that sent by name server are: in domain name mapping device, recognition rule is set, determines according to set recognition rule whether the multiple inquiry of the domain name request messages or the multiple inquiry of the domain name response message that receive come from same domain name mapping process.
Set recognition rule is: judgement receives multiple messages and is no more than interval time of setting interval time, judge that Transaction Identifier Transaction ID source port number identical, that the judge multiple inquiry of the domain name request messages destination slogan identical, that judge multiple inquiry of the domain name response messages of the domain name system field Domain Name System in multiple messages is identical, judge domain name that multiple messages carry identical with type with judge one or more combinations in identical of the source of multiple messages or object IP address information.
Describedly determine according to set recognition rule whether multiple inquiry of the domain name request messages of receiving or multiple inquiry of the domain name response message come from same domain name mapping process and be: in domain name mapping device, safeguard a message status table, the information of buffer memory received packet, determine whether to meet according to institute's recorded message information the recognition rule setting, further determine whether the multiple inquiry of the domain name request messages or the multiple inquiry of the domain name response message that receive come from same domain name mapping process.
Described interception rule is: inquiry of the domain name request message or inquiry of the domain name response message are implemented to interception, or to both tackling; Tackle according to message repeating direction; Judge in this domain name mapping process whether inquiry of the domain name request message has been replied to inquiry of the domain name response message, as dont answer transparent transmission inquiry of the domain name response message to client, otherwise, interception inquiry of the domain name response message; The message interception participating according to the source IP address of message and name server IP address, to client or name server; And according to domain name to one or more combinations in message interception.
A kind of domain name mapping device, comprising: identification module, blocking module and transparent transmission module, wherein,
Identification module, for identifying multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message of same domain name mapping process;
Blocking module, for according to the recognition result of identification module, tackles wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy;
Transparent transmission module, for according to the recognition result of identification module, the nonredundant inquiry of the domain name request message of transparent transmission or nonredundant inquiry of the domain name response message.
Described identification module comprises the first identification module, for recognition rule is set, according to recognition rule, identifies multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message in same domain name mapping process.
Described blocking module also comprises the first blocking module, and for interception rule is set, the inquiry of the domain name request message according to interception rule to redundancy or the inquiry of the domain name response message of redundancy are tackled.
As can be seen from the above scheme, the present invention arranges domain name mapping device between client and name server, this device is identified after the multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message in same domain name mapping process, tackle wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy, the nonredundant inquiry of the domain name request message of transparent transmission to name server or the nonredundant inquiry of the domain name response message of transparent transmission to client.Like this, method provided by the invention and device just can, to the inquiry of the domain name response message interception of the inquiry of the domain name request message of redundancy or redundancy, alleviate name server processing pressure and save the network bandwidth.
Brief description of the drawings
The domain name analytic method flow chart that Fig. 1 provides for prior art;
The domain name analytic method flow chart that Fig. 2 provides for the embodiment of the present invention;
The domain name mapping apparatus structure schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The domain name analytic method instantiation flow chart that Fig. 4 provides for the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
In order to make name server unduplicated to the multiple inquiry of the domain name request message processing in same domain name mapping process, reply multiple identical inquiry of the domain name response messages, alleviate name server processing pressure and save the network bandwidth; Or for client does not repeat to receive multiple same domain name inquiry response messages in same domain name mapping process, save the network bandwidth.The present invention arranges domain name mapping device between client and name server, this device is identified after the multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message in same domain name mapping process, tackle wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy, the nonredundant inquiry of the domain name request message of transparent transmission to name server or the nonredundant inquiry of the domain name response message of transparent transmission to client.
In embodiments of the present invention, set domain name mapping device can independently exist in network, also can be used as functional module is integrated in other devices in network, be deployed in inquiry of the domain name request message between client and name server or the inquiry of the domain name response message any place through link, as in the gateway of the gateway between the home gateway of client-side, client and name server, name server side, client or in name server.
Fig. 2, for the domain name analytic method flow chart that the embodiment of the present invention provides, arranges domain name mapping device between client and name server, and its concrete steps are:
Step 201, domain name mapping device are identified multiple inquiry of the domain name request messages or the multiple inquiry of the domain name response message in same domain name mapping process;
Step 202, domain name mapping device are tackled wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy, the nonredundant inquiry of the domain name request message of transparent transmission or nonredundant inquiry of the domain name response message.
In embodiments of the present invention, domain name mapping device is identified multiple inquiry of the domain name request messages or the multiple inquiry of the domain name response message in same domain name mapping process, be specially: in domain name mapping device, recognition rule is set, determines according to set recognition rule whether the multiple inquiry of the domain name request messages or the multiple inquiry of the domain name response message that receive come from same domain name mapping process.
Set recognition rule can be: judgement receives multiple messages and is no more than interval time of setting interval time, judge that Transaction Identifier (Transaction ID) source port number identical, that the judge multiple inquiry of the domain name request messages destination slogan identical, that judge multiple inquiry of the domain name response messages of the domain name system field (Domain Name System) in multiple messages is identical, judge domain name that multiple messages carry identical with type with judge one or more combinations in identical of the source of multiple messages or object IP address information.
When judgement receives multiple message and is no more than the interval time of setting interval time, can be set as 0.5 second interval time, determines whether multiple messages are received inland continued access in 0.5 second.
Specifically, safeguard a message status table in domain name mapping device, the information of buffer memory received packet, determines whether to meet according to institute's recorded message information the recognition rule setting.In this message status table, the information of received packet in the same domain name mapping process of each entry record, each entry is provided with life span, and such as initial value is set to 500 milliseconds, life span is successively decreased after entry creates, and reduces to 0 o'clock entry deleted.Domain name mapping device receives after inquiry of the domain name request message or inquiry of the domain name response message, if this message information mates the message information in the entry having recorded, in the packet counting value in this entry, increase by 1, if do not mated, increase an entry, two entry record in message status table as shown in table 1.
Table 1
Domain name mapping device is after the multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message identified in same domain name mapping process, just can tackle and abandon wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy according to the interception rule setting, the nonredundant inquiry of the domain name request message of transparent transmission to name server or the nonredundant inquiry of the domain name response message of transparent transmission to client.
In embodiments of the present invention, interception rule can be: inquiry of the domain name request message or inquiry of the domain name response message are implemented to interception, or to both tackling; According to message repeating direction, such as the message sending to the message that sends to name server or to name server is tackled; Judge in this domain name mapping process and whether inquiry of the domain name request message has been replied to inquiry of the domain name response message, namely in entry, inquiry of the domain name response message is counted as and is more than or equal to 1, as dont answer transparent transmission inquiry of the domain name response message to client, otherwise, interception inquiry of the domain name response message; The message interception participating according to the source IP address of message and name server IP address, to given client end or name server; According to other information such as domain names, message is tackled.More than tackling rule can combine.
Fig. 3 is the domain name mapping apparatus structure schematic diagram that the embodiment of the present invention provides, and comprising: identification module, blocking module and transparent transmission module, wherein,
Identification module, for identifying multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message of same domain name mapping process;
Blocking module, for according to the recognition result of identification module, tackles wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy;
Transparent transmission module, for according to the recognition result of identification module, the nonredundant inquiry of the domain name request message of transparent transmission or nonredundant inquiry of the domain name response message.
In this structure, identification module comprises the first identification module, for recognition rule is set, according to recognition rule, identifies multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message in same domain name mapping process.
In this structure, blocking module also comprises the first blocking module, and for interception rule is set, the inquiry of the domain name request message according to interception rule to redundancy or the inquiry of the domain name response message of redundancy are tackled.
Fig. 4, for the domain name analytic method instantiation flow chart that the embodiment of the present invention provides, arranges domain name mapping device between client and name server, and this embodiment example can be applied in the embodiment described in Fig. 1, and its concrete steps are:
Step 401, domain name mapping device receive inquiry of the domain name request message;
Step 402, domain name mapping device determine that according to the recognition rule arranging this inquiry of the domain name request response is not the inquiry of the domain name request message of redundancy, this inquiry of the domain name request message of transparent transmission;
In this step, in the time that this inquiry of the domain name request message arrives domain name mapping device, in message status table in this domain name mapping device, inquiry is less than the entry of this message carry information of coupling, set up after the entry of this affiliated domain name mapping process of this message, determine that this message is not the inquiry of the domain name request of redundancy, in set up entry, inquiry of the domain name request message number is increased to 1, because inquiry of the domain name request message number is no more than 2, so determine it is not the inquiry of the domain name request message of redundancy;
Step 403, domain name mapping device receive second inquiry of the domain name request message;
Step 404, domain name mapping device determine that according to the recognition rule arranging this inquiry of the domain name request response is not the inquiry of the domain name request message of redundancy, this inquiry of the domain name request message of transparent transmission;
In this step, in the time that this inquiry of the domain name request message arrives domain name mapping device, in message status table in this domain name mapping device, inquire the entry of this message carry information of coupling, inquiry of the domain name request message number is increased to 1 and obtain 2, because inquiry of the domain name request message number is no more than 2, so determine it is not the inquiry of the domain name request message of redundancy;
Step 405, domain name mapping device receive the 3rd inquiry of the domain name request message;
Step 406, domain name mapping device determine according to the recognition rule arranging the inquiry of the domain name request message that this inquiry of the domain name request is redundancy, interception;
In this step, in the time that this inquiry of the domain name request message arrives domain name mapping device, in message status table in this domain name mapping device, inquire the entry of this message carry information of coupling, inquiry of the domain name request message number is increased to 1 and obtain 3, because inquiry of the domain name request message outnumbers 2, so determine it is the inquiry of the domain name request message of redundancy;
Step 407, domain name mapping device receive the 4th inquiry of the domain name request message;
Step 408, domain name mapping device determine that according to the recognition rule arranging this inquiry of the domain name request response is the inquiry of the domain name request message of redundancy, interception;
In this step, in the time that this inquiry of the domain name request message arrives domain name mapping device, in message status table in this domain name mapping device, inquire the entry of this message carry information of coupling, inquiry of the domain name request message number is increased to 1 and obtain 4, because inquiry of the domain name request message outnumbers 2, so determine it is the inquiry of the domain name request message of redundancy;
Step 409, domain name mapping device receive inquiry of the domain name response message;
In this step, the inquiry of the domain name request message of step 402 transparent transmission reaches name server, and name server will return to the inquiry of the domain name response message that carries corresponding IP address information;
Step 410, domain name mapping device are determined the inquiry of the domain name response message that this inquiry of the domain name response message is not redundancy, this inquiry of the domain name response message of transparent transmission according to the recognition rule arranging;
In this step, in the time that this inquiry of the domain name response message arrives domain name mapping device, in message status table in this domain name mapping device, inquire the entry of this message carry information of coupling, inquiry of the domain name response message number in this entry is increased to 1 and obtain 1, because inquiry of the domain name response message number is no more than 2, so determine it is not the inquiry of the domain name response message of redundancy;
Step 411, domain name mapping device receive second inquiry of the domain name response message;
In this step, the inquiry of the domain name request message of step 404 transparent transmission reaches name server, and name server will return to second the inquiry of the domain name response message that carries corresponding IP address information;
Step 412, domain name mapping device are determined the inquiry of the domain name response message that this inquiry of the domain name response message is not redundancy, this inquiry of the domain name response message of transparent transmission according to the recognition rule arranging;
In this step, in the time that this inquiry of the domain name response message arrives domain name mapping device, in message status table in this domain name mapping device, inquire the entry of this message carry information of coupling, inquiry of the domain name response message number in this entry is increased to 1 and obtain 2, because inquiry of the domain name response message number is no more than 2, so determine it is not the inquiry of the domain name response message of redundancy.
In fact domain name mapping process described in Fig. 4 is exactly:
First, the domain name mapping device that the application call client of client arranges, carries out domain name mapping;
Then, the domain name mapping device of client setting is accepted after calling of this application program, sends inquiry of the domain name request message to name server, and this example sends altogether inquiry request message four times;
In this step, the domain name that inquiry of the domain name request is carried is www.abc.com, due to the domain name mapping behavior of application program or operating system itself, need to send inquiry of the domain name request message four times;
Then, redundancy domain name inquiry request message is wherein identified and tackled to domain name mapping device according to the recognition rule setting to the inquiry of the domain name request message in the same domain name mapping process of the domain name mapping device from client setting, the nonredundant inquiry of the domain name request message of transparent transmission, in the present embodiment, by two inquiry of the domain name request message transparent transmissions receiving at first, by two follow-up inquiry of the domain name request message interceptions;
Follow, name server receives after the inquiry of the domain name request message of domain name mapping device transparent transmission again, resolves the IP address information obtaining should domain name, sends two inquiry of the domain name response messages;
Finally, redundancy domain name inquiry response message is wherein identified and tackled to domain name mapping device according to the recognition rule setting to the inquiry of the domain name response message in the same domain name mapping process from name server, the nonredundant inquiry of the domain name response message of transparent transmission, in the present embodiment, two inquiry of the domain name response messages that transparent transmission receives.
More than lift preferred embodiment; the object, technical solutions and advantages of the present invention are further described; institute is understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment of doing, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a domain name analytic method, is characterized in that, domain name mapping device is set between client and name server, and the method also comprises:
Domain name mapping device is identified the multiple inquiry of the domain name request messages that sent by client in same domain name mapping process or the multiple inquiry of the domain name response messages that sent by name server;
Domain name mapping device is tackled wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy, the nonredundant inquiry of the domain name request message of transparent transmission or nonredundant inquiry of the domain name response message.
2. the method for claim 1, it is characterized in that, the multiple inquiry of the domain name request messages that sent by client in the same domain name mapping process of described identification or the multiple inquiry of the domain name response messages that sent by name server are: in domain name mapping device, recognition rule is set, determines according to set recognition rule whether the multiple inquiry of the domain name request messages or the multiple inquiry of the domain name response message that receive come from same domain name mapping process.
3. method as claimed in claim 2, it is characterized in that, set recognition rule is: the multiple messages of judgement reception are no more than the interval time of setting interval time, the Transaction Identifier Transaction ID that judges the domain name system field Domain Name System in multiple messages is identical, the source port number that judges multiple inquiry of the domain name request messages is identical, the destination slogan that judges multiple inquiry of the domain name response messages is identical, judge that the domain name that multiple messages carry is identical with type, with judge one or more combinations in identical of the source of multiple messages or object IP address information.
4. method as claimed in claim 2, it is characterized in that, describedly determine according to set recognition rule whether multiple inquiry of the domain name request messages of receiving or multiple inquiry of the domain name response message come from same domain name mapping process and be: in domain name mapping device, safeguard a message status table, the information of buffer memory received packet, determine whether to meet according to institute's recorded message information the recognition rule setting, further determine whether the multiple inquiry of the domain name request messages or the multiple inquiry of the domain name response message that receive come from same domain name mapping process.
5. the method for claim 1, is characterized in that, described interception rule is: inquiry of the domain name request message or inquiry of the domain name response message are implemented to interception, or to both tackling; Tackle according to message repeating direction; Judge in this domain name mapping process whether inquiry of the domain name request message has been replied to inquiry of the domain name response message, as dont answer transparent transmission inquiry of the domain name response message to client, otherwise, interception inquiry of the domain name response message; The message interception participating according to the source IP address of message and name server IP address, to client or name server; And according to domain name to one or more combinations in message interception.
6. a domain name mapping device, is characterized in that, comprising: identification module, blocking module and transparent transmission module, wherein,
Identification module, for identifying the multiple inquiry of the domain name request messages that sent by client of same domain name mapping process or the multiple inquiry of the domain name response messages that sent by name server;
Blocking module, for according to the recognition result of identification module, tackles wherein the inquiry of the domain name request message of redundancy or the inquiry of the domain name response message of redundancy;
Transparent transmission module, for according to the recognition result of identification module, the nonredundant inquiry of the domain name request message of transparent transmission or nonredundant inquiry of the domain name response message.
7. device as claimed in claim 6, it is characterized in that, described identification module comprises the first identification module, for recognition rule is set, according to recognition rule, identify multiple inquiry of the domain name request messages or multiple inquiry of the domain name response message in same domain name mapping process.
8. device as claimed in claim 6, is characterized in that, described blocking module also comprises the first blocking module, and for interception rule is set, the inquiry of the domain name request message according to interception rule to redundancy or the inquiry of the domain name response message of redundancy are tackled.
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Application publication date: 20140806 |