CN101969478A - Intelligent DNS message processing method and processing device - Google Patents
Intelligent DNS message processing method and processing device Download PDFInfo
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Abstract
The invention provides an intelligent domain name system (DNS) service processing method and an intelligent DNS service processing device. The method comprises the following steps of: judging whether the connection to which a DNS response message belongs undergoes network address translation (NAT) processing or not; matching an I address of a HTTP Server in a message with a private network E address in a static mapping list item; if the matching is successful, modifying an HTTP Server address in the message according to a mapping relation and then forwarding the modified HTTP Server address; if the matching fails, entering a message forwarding process, namely matching the connection which does not undergo the NAT processing with a public network IP address in the static mapping list item; if the matching is successful, modifying the HTTP Server address according to the mapping relation and then forwarding the modified HTTP Server address; and if the matching fails, entering the massage forwarding process. By the method and the device, the configuration work of users is greatly simplified.
Description
Technical field
The present invention relates to the intelligent gateway technology, relate in particular to a kind of technology that intelligent DNS message is handled of on gateway device, carrying out.
Background technology
HTTP for enterprise uses; HTTP Server (hypertext transfer protocol server〉place usually have safety function gateway device after Intranet; the benefit of doing like this is to avoid HTTPServer to be directly exposed on the public network; can effectively resist diverse network by the security mechanism of intranet and extranet isolation and safety means attacks; such as based on the extensive aggression of Transmission Control Protocol or based on the various attack of http protocol, thereby arrive the purpose of protection HTTP Server.
Because HTTP Server is in Intranet, its configuration or assigned IP address be private network IP address, inner user (Client) can communicate with it, but its can't be directly and outside Client communicate.Usually need on gateway device, enable nat feature for this reason, the HTTP service message is carried out the conversion of private network IP address to public network IP address.Yet because the http protocol regulation is initiated communication by Client, before the NAT list item is not set up, Client from public network can't have access to HTTP Server, therefore also need dispose NAT static mappings table on the external interface of gateway device, be fixed public network IP address of private network IP address assignment of HTTP Server in the static mappings list item.Client can visit the public network IP address in the gateway device static entry like this, and gateway device carries out sending to HTTP Server after NAT handles at the message to Client then, and so the HTTP service channel between Client and the Server has just been got through.
Client need send the DNS request to obtain the IP address of this website before certain HTTP website of visit.As previously mentioned because HTTP Server need accept visit from public network and private network Client simultaneously, and each http server only is provided with an IP address among the DNS Server.Therefore need on gateway device, enable DNS ALG characteristic, please refer to two kinds of typical application of Fig. 1 and Fig. 2, the IP address of the HTTP Server that disposes on the DNS Server in Fig. 1 is private network IP address, then for the DNS response message that sends to Intranet user, gateway device is not done special processing to the DNS response message; Then need make amendment to the DNS response message in the DNSALG module for the DNS response message that sends to public network user, the public network IP address that configures is revised as in the private network IP address of message inside being carried HTTP Server, and then transmits.Next just opposite at the network environment of Fig. 2, do not do special processing for the DNS response message that sends public network user, the public network IP address that then needs message inside to be carried HTTP Server for the DNS response message that sends to private user is revised as the private network IP address that configures.
Please further with reference to figure 3, under the network environment of Fig. 3, for gateway device, because DNSServer is positioned at public network, IP address of HTTP Server of configuration must be a public network IP address in it.For from the DNS of public network request with reply without gateway device accordingly, but then can pass through gateway device for DNS request and the corresponding D NS response message from Intranet, the public network IP address that gateway device need carry DNS response message inside HTTP Server is revised as the private network IP address that configures.
Use for above Fig. 1 and two kinds of typical actual networkings of Fig. 2, all need to carry out extra DNSALG configuration, also needing further to distinguish is the Intranet or the situation of public network; In case and the IP address of HTTPServer changes, and then need reconfigure on gateway device, increased the complexity of ordinary enterprises user's management and application.For Fig. 3, though it does not need to carry out extra configuration, DNS Server is positioned on the public network; lack the protection of safety means; may become the object of being attacked, thereby bring bigger potential safety hazard, and the higher saving that also is unfavorable for public network IP address of lower deployment cost.
Summary of the invention
In view of this, the present invention is intended to dispose a kind of the DNS method for processing business and the processing unit of intelligence more for gateway device, comes the configuration effort of assisting users simplification to network with more intelligent processing method.Technical scheme of the present invention is as follows:
The invention provides a kind of DNS message processing method of intelligence, it is applied in the gateway device, wherein this gateway device is between private network and public network, wherein said private network inside has at least one HTTPServer, described gateway device is used for that the message that transmits between private network and the public network is carried out network address translation (nat) to be handled, and on the interface of public network, disposing the static mappings list item, described static mappings list item comprises the private net address of described HTTP Server and the public network address that has mapping relations with it, and this method comprises:
A discerns the message by gateway device, therefrom identifies the DNS response message;
B judges whether the connection under the described DNS response message has carried out the NAT processing; If change step C, otherwise change step D
C, remove to mate private net address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the network address of the HTTP Server that carries in the DNS response message being revised, otherwise enter the message forwarding process according to described mapping relations;
D, remove to mate public network address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the network address of the HTTP Server that carries in the DNS message being revised, otherwise enter the message forwarding process according to described mapping relations.
Preferably, comprised also before step C that step e is carried out Hash operation to the public network address in the static mappings list item and generated the public network address chained list, and the private net address Hash operation in the static mappings list item is generated the private net address chained list; Matching process among the wherein said step C is specially, the network address of extracting the HTTP Server that carries in the described DNS message is carried out Hash operation and mated described private net address chained list then: the matching process among the described step D is specially, and the network address of extracting the HTTPServer that carries in the described DNS message is carried out Hash operation and mated described public network address chained list then.
Preferably, described steps A identifies the DNS response message by the corresponding message identification of DNS.
Preferably, the described HTTP Server address of carrying in the DNS message modification according to mapping relations is specially, if the HTTP Server network address that DNS carries is a public network address, then it is revised as the private net address that shines upon mutually with this public network address, if the HTTP Server address that DNS carries is a private net address, then it is revised as public network address with this private net address mapping.
The present invention also provides a kind of DNS message process device of intelligence, it is applied in the gateway device, wherein this gateway device is between private network and public network, wherein said private network inside has at least one HTTPServer, described gateway device is used for that the message that transmits between private network and the public network is carried out network address translation (nat) to be handled, and on the interface of public network, disposing the static mappings list item, the public network E address that described static mappings list item comprises the private net address of described HTTP Server and has mapping relations with it, described it is characterized in that, this processing unit comprises the message identification module, enquiry module and DNS application module, wherein
The message identification module is used for the message by gateway device is discerned, and therefrom identifies the DNS response message and submits enquiry module to;
Enquiry module, the user judges whether the connection under the described DNS response message has carried out the NAT processing, and submits judged result to the DNS application module;
The DNS application module, be used in described judged result for when being, remove to mate private net address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the address of the HTTP Server that carries in the DNS response message being revised, otherwise message is sent into normal forwarding process according to described mapping relations; Perhaps be used in described judged result for when denying, remove to mate public network address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the network address of the HTTP Server that carries in the DNS message being revised, otherwise message is sent into normal forwarding process according to described mapping relations.
Preferably, described processing unit also comprises the chained list generation module, and it is used for the public network address of static mappings list item is carried out Hash operation generation public network address chained list, and the private net address Hash operation in the static mappings list item is generated the private net address chained list; Wherein the matching process of DNS application module is specially, and the network address of extracting the HTTP Server that carries in the described DNS message is carried out Hash operation and mated described public network/private net address chained list then.
Preferably, described message identification module identifies the DNS response message by the corresponding message identification of DNS.
Preferably, described DNS application module is revised the HTTPServer network address of carrying in the DNS message according to mapping relations and is specially, if the HTTP Server address that DNS carries is a public network address, then it is revised as private net address with this public network address mapping, if the HTTTPServer address that DNS carries is a private net address, then it is revised as public network address with this private network IP map addresses.
Description of drawings
Fig. 1 is the networking diagram that a kind of typical HTTP of enterprise uses.
Fig. 2 is the networking diagrams of other the two kinds of typical HTTP of enterprise application.
Fig. 3 is the networking model that another typical HTTP of enterprise uses.
Fig. 4 is the building-block of logic of the present invention's intelligence DNS device.
Embodiment
The present invention focuses on gateway device pair and handles with the intellectuality of DNS response message, and reduces user's configuration effort by this, and can not be subjected to the influence of http server address configuration change.With preferred implementation, the present invention recommends to adopt computer software as realization mechanism, certainly the present invention do not get rid of soft or hard in conjunction with and the realization of firmware, below introduce the general handling process of the present invention earlier, and describe in conjunction with some examples by better embodiment.
Please refer to the building-block of logic of the present invention of Fig. 4, at first need some the normal configurations in the network environment are introduced, these configurations are the bases of finishing normal inside and outside business intercommunication.Be static mappings list item of HTTP Server configuration at gateway device earlier, be corresponding public network IP address of private network IP address assignment of HTTP Server, guarantee that public network user can be to HTTP Server initiation communication.Because DNS Server also is positioned at Intranet, then need carry out corresponding static mapping configuration equally.Need to prove that the combination that can use the IP address to add port in the at present popular NAT technology identifies unique intranet host in other words as the external network address, so that save public network IP address.Therefore for succinct more and convenient on describing, if not otherwise specified, when relating to the NAT process, it has comprised the situation of IP address the network address, the situation that has comprised IP address+port combination equally, this is to understand easily for those of ordinary skills, and also is to meet description convention commonly used.Next need correctly to dispose the network address of HTTP Server on the dns server, this address can be the private net address of HTTP Server self, also can be the public network address that has mapping relations with this private net address that disposes on the gateway device external interface, the present invention still be that its public network address that shines upon on gateway device is without any restriction to the private net address of configuration HTTP Server self.
As shown in Figure 4, intelligent DNS business processing device comprises message identification module 20, enquiry module 30 and DNS application module 40 in the preferred embodiment of the present invention, and it is responsible for handling the main flow process of the present invention respectively.
Step 101 pair is discerned by the message of gateway device, therefrom identifies the DNS response message; This step is handled by message identification module 20, and in general the message identification module both can be that software realizes it also can being that bottom hardware is realized, if the bottom chip support can adopt the mode of hardware identification can improve speed.For the DNS response message, can discern by the sign of message earlier,, discern response message or request message by the QR flag bit in the DNS message then such as identifying all DNS messages by well-known port number earlier.
Whether the connection under the described DNS response message that step 102, determining step 101 obtain has carried out the NAT processing: if, change step 103, otherwise change step 104, promptly judged result is submitted to DNS application module 40.This step 102 is mainly carried out by enquiry module 30.Specifically, (such as the combination of the source and destination IP address of message) removes to mate NAT dynamically and static entry according to the link information of DNS response message; If the match is successful then illustrate that the described connection of this message passed through NAT and handled.Need to prove that the link information here is a comparison broad sense, the tlv triple of message and five-tuple all can use, as long as and match before the NAT conversion or the conversion of the source and destination IP after conversion combination can.
Step 103, if determining step 102 judged results are for being, remove to mate private net address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the network address of the HTTP Server that carries in the DNS response message being revised, otherwise enter the normal message forwarding process according to described mapping relations.Step 104, if determining step 102 judged results are for denying, remove to mate public network address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the address of the HTTP Server that carries in the DNS message being revised, otherwise enter the normal message forwarding process according to described mapping relations.What need supplementary notes is, it is for this special processing of address of aforementioned modifications HTTPServer that what is called enters the normal message forwarding process, be not two or three layers of forwarding that refer to message merely, but say and allow message walk original due handling process, might need in this process to be that safety filtering or NAT etc. handle.
Step 103 and 104 is carried out by DNS application module 40, specifically, exists the mapping of a plurality of private net addresses and public network address right in the static mappings list item.In a kind of implementation of excellent limit, processing unit of the present invention also comprises a chained list generation module 50, be mainly used in the private net address in the static mappings list item is carried out private network chained list 60 of Hash operation composition, and public network address carries out putting into a public network chained list 70 after the Hash operation; The DNS application module is when carrying out coupling, and the address of the HTTP Server that carries in the described DNS message of elder generation's extraction is carried out Hash operation and mated described public network/private net address chained list then.Owing to the more than record of static mappings list item possibility, and when realizing, adopt software engineering usually, utilize the matching efficiency that the network address that can improve step 103 and 104 is set of Hash processing and chained list, avoid influencing the experience of User DN S business.
Modification for message, if the HTTP Server address that DNS carries is a public network address, then it is revised as the private net address that shines upon with this public network address,, then it is revised as public network address with this private net address mapping if the HTTP Server address that DNS carries is a private net address.
Be illustrated below in conjunction with Fig. 1, Fig. 2 and Fig. 3.The network address of the HTTP Server that disposes on the DNS Server in Fig. 1 is private net address 192.168.2.253, the network equipment FW (gateway device of the present invention a kind of) of band firewall functionality goes up HTTP Server has been disposed external static mappings list item, wherein HTTP Server ground private net address 192.168.2.253 and public network address 202.98.5.68 have mapping relations, the private net address 192.168.2.254 that supposes dns server is mapped to 202.98.5.68 equally, according to popular NAT technology, for the uniqueness that guarantees to shine upon, need the leading-in end slogan, supposing that port numbers is 80 for HTTP Server, is 53 for DNS Server.Visit to DNS Server mainly contains two kinds of situations, promptly Intranet user initiate and external user initiates.
For the situation that Intranet user is initiated, in general, the day mark of Intranet user is the private net address that will obtain HTTPServer, below this target is verified.If the Intranet user 192.168.2.2 that SW (switch) hangs down sends the DNS request to DNS Server, because the NAT conversion all at interior network interface, therefore can not carried out now in its network address.When FW has identified DNS Server and has returned to the DNS response message (inside carries the network address 192.168.2.253 of HTTP Server) of 192.168.2.2 from the message that interface is received, FW shows with the source IP address and the current NAT stream of purpose IP matching addresses of message, obviously coupling can not hit, according to flow process of the present invention, should change step 104 over to handles, remove public network address in the matched static mapping item with the network address 192.168.2.253 of the HTTP Server that carries in the message, because this moment, the destination address of message was 192.168.2.254, it is a private net address, coupling obviously can not be hit, therefore FW does not do special processing, transmits this DNS response message according to normal flow.So 192.168.2.2 can be subjected to the DNS response message of unmodified, and is resolved to its needed HTTP Server network address 192.168.2.53 from response message inside; Obviously the target checking is set up, and Intranet user has successfully obtained the private net address of its needed HTTPServer.
For for the User DN S request of public network direction, in general, it need obtain the public network address (IP 202.98.5.68, port 80) that HTTPServer shines upon on FW; At first the user can be to (IP 202.98.5.68, port 53) initiates the DNS request, owing to there is the corresponding static mapping item, FW can carry out NAT to this request message to be handled, destination address is revised as the private net address of DNS Server, be transmitted to DNS Server then, DNS Server receives that the back generates the DNS response message and re-sends to FW.After FW identifies the DNS response message, judge this according to link information (such as purpose IP and source IP combination) and static mappings list item and be connected and do the NAT processing, need be sent to step 103 at this moment according to flow process of the present invention and handle.Remove private net address in the matched static mapping item with the network address 192.168.2.253 of the HTTP Server that carries in the message, as previously mentioned, owing to there is the record of the mapping of 192.168.2.253 in the static mappings list item, therefore obviously can the match is successful, the 192.168.2.253 that the DNS response message need be carried this moment is revised as the public network address 202.98.5.68 of its mapping, and then being transmitted to user from public network, public network user has successfully obtained the public network address that HTTP Server shines upon on FW thus.
For the situation of Fig. 2, just opposite, will be modified for the DNS response message that returns to Intranet user, and the DNS message that returns to public network user can not be modified.Detailed process describes in detail no longer one by one.For Fig. 1 and two kinds of situations of Fig. 2, no matter where the user from initiating the DNS request, no matter how the HTTP Server address of the configuration on the DNS Server changes, or how the address configuration of the static mappings list item on the gateway device changes, and gateway device all can return to the network address of the optimal HTTP Server of user intelligently.The user can arbitrarily need carry out the change of above-mentioned normal configuration according to own service, and such becoming can not cause producing any extra configuration effort, simplified user's network design and management work.
Described above only is the preferable implementation of the present invention, and in order to limit protection scope of the present invention, any variation that is equal to and modification all should not be encompassed within protection scope of the present invention.
Claims (8)
1. the DNS message processing method of an intelligence, it is applied in the gateway device, wherein this gateway device is between private network and public network, wherein said private network inside has at least one HTTP Server, described gateway device is used for that the message that transmits between private network and the public network is carried out network address translation (nat) to be handled, and on the interface of public network, disposing the static mappings list item, described static mappings list item comprises the private net address of described HTTP Server and the public network address that has mapping relations with it, it is characterized in that this method comprises:
A discerns the message by gateway device, therefrom identifies the DNS response message;
B judges whether the connection under the described DNS response message has carried out the NAT processing; If change step C, otherwise change step D
C, remove to mate private net address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the network address of the HTTP Server that carries in the DNS response message being revised, otherwise enter the message forwarding process according to described mapping relations;
D, remove to mate public network address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the network address of the HTTP Server that carries in the DNS message being revised, otherwise enter the message forwarding process according to described mapping relations.
2. method according to claim 1, it is characterized in that, before step C, also comprise step e, public network address in the static mappings list item is carried out Hash operation generate the public network address chained list, the private net address Hash operation in the static mappings list item is generated the private net address chained list; Matching process among the wherein said step C is specially, the network address of extracting the HTTP Server that carries in the described DNS message is carried out Hash operation and mated described private net address chained list then: the matching process among the described step D is specially, and the network address of extracting the HTTP Server that carries in the described DNS message is carried out Hash operation and mated described public network address chained list then.
3. method according to claim 1 is characterized in that, described steps A identifies the DNS response message by the corresponding message identification of DNS.
4. method according to claim 1, it is characterized in that, the described HTTP Server address of carrying in the DNS message modification according to mapping relations is specially, if the HTTP Server network address that DNS carries is a public network address, then it is revised as the private net address that shines upon mutually with this public network address, if the HTTP Server address that DNS carries is a private net address, then it is revised as public network address with this private net address mapping.
5. the DNS message process device of an intelligence, it is applied in the gateway device, wherein this gateway device is between private network and public network, wherein said private network inside has at least one HTTP Server, described gateway device is used for that the message that transmits between private network and the public network is carried out network address translation (nat) to be handled, and on the interface of public network, disposing the static mappings list item, the public network E address that described static mappings list item comprises the private net address of described HTTP Server and has mapping relations with it, described it is characterized in that, this processing unit comprises the message identification module, enquiry module and DNS application module, wherein
The message identification module is used for the message by gateway device is discerned, and therefrom identifies the DNS response message and submits enquiry module to;
Enquiry module, the user judges whether the connection under the described DNS response message has carried out the NAT processing, and submits judged result to the DNS application module;
The DNS application module, be used in described judged result for when being, remove to mate private net address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the address of the HTTP Server that carries in the DNS response message being revised, otherwise message is sent into normal forwarding process according to described mapping relations; Perhaps be used in described judged result for when denying, remove to mate public network address in the described static mappings list item with the network address of the HTTP Server that carries in the described DNS message, if the match is successful, transmit again after then the network address of the HTTP Server that carries in the DNS message being revised, otherwise message is sent into normal forwarding process according to described mapping relations.
6. processing unit according to claim 5, it is characterized in that, comprise the chained list generation module, it is used for the public network address of static mappings list item is carried out Hash operation generation public network address chained list, and the private net address Hash operation in the static mappings list item is generated the private net address chained list; Wherein the matching process of DNS application module is specially, and the network address of extracting the HTTP Server that carries in the described DNS message is carried out Hash operation and mated described public network/private net address chained list then.
7. method according to claim 5 is characterized in that, described message identification module identifies the DNS response message by the corresponding message identification of DNS.
8. processing unit according to claim 5, it is characterized in that, described DNS application module is revised the HTTP Server network address of carrying in the DNS message according to mapping relations and is specially, if the HTTP Server address that DNS carries is a public network address, then it is revised as private net address with this public network address mapping, if the HTTTPServer address that DNS carries is a private net address, then it is revised as public network address with this private network IP map addresses.
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| CN107707683A (en) * | 2017-05-22 | 2018-02-16 | 贵州白山云科技有限公司 | A kind of method and apparatus of reduction DNS message lengths |
| CN108429684A (en) * | 2018-03-30 | 2018-08-21 | 上海地面通信息网络股份有限公司 | A kind of Network Access Method redirected based on dynamic routing with IP mapping techniques |
| CN113242299A (en) * | 2021-05-11 | 2021-08-10 | 鸬鹚科技(深圳)有限公司 | Disaster recovery system, method, computer device and medium for multiple data centers |
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| US20030169766A1 (en) * | 2002-03-05 | 2003-09-11 | Jun Ogawa | Communications apparatus and network system |
| CN101610294A (en) * | 2009-07-15 | 2009-12-23 | 浪潮电子信息产业股份有限公司 | A kind of method of utilizing intelligent DNS to improve website visiting speed |
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| CN104735073A (en) * | 2015-03-30 | 2015-06-24 | 广州杰赛科技股份有限公司 | IPv4-IPv6 transitional protocol dispatching method and device |
| CN107707683A (en) * | 2017-05-22 | 2018-02-16 | 贵州白山云科技有限公司 | A kind of method and apparatus of reduction DNS message lengths |
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| CN101969478B (en) | 2013-03-20 |
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