CN103327137A - Router domain name access method - Google Patents

Abstract

The invention provides a router domain name access method suitable for being applied to a terminal with a windows operation system. When an upstream DHCP is not started, whether a local hosts file or netbios cache has the corresponding domain name or not is found, if not, a DNS packet is sent to query a network whether the domain name has the corresponding IP, and if not, an NBNS packet protocol package is sent. According to the method, a problem of accessing a router management interface in the condition that a router upstream DHCP is closed and a management IP is forgotten is solved.

Description

A kind of router domain name access method

Technical field

The present invention relates to computer networking technology, particularly a kind of router domain name access method.

Background technology

Domain name (Domain Name), by a string title with a upper a certain computer of Internet that the name of separating forms or calculating unit, the electronic bearing (sometimes also referring to the geographical position) that is used for sign computer when transfer of data, a domain name, the administrative autonomy power of its definition, the boundary of power or control the Internet.Domain name is on the IP address " mask " to be arranged.The purpose of a domain name is to be convenient to remember and the address (website, Email, FTP etc.) of one group of server of linking up.Domain name is as unforgettable the Internet participant's in power title, such as computer, and network and service.

Router (Router) is the equipment that connects each local area network (LAN), wide area network in the internet, and it can be selected and the setting route automatically according to the situation of channel, with optimal path, by the equipment of front and back order transmitted signal.Router is hinge, " traffic-police " of internet.Router has been widely used in all trades and professions at present, and the product of various different class has become the main force that realizes the inner connection of various backbone networks, key internetworking and backbone network and the Internet business of interconnecting.Router (Router) claims that again gateway device (Gateway) is be used to connecting a plurality of networks that separate in logic, and so-called logical network is to represent an independent network or a subnet.When data are transferred to another subnet from a subnet, can finish by the routing function of router.Therefore, router has the function of judging the network address and selecting the IP path, it can be in many network interconnections environment, set up flexibly and connect, available diverse packet is connected various subnets with media access method, router is only accepted the information of source station or other routers, belongs to a kind of InterWorking Equipment of network layer.

Router divides local router and remote router, and local router is used for the interconnection network transmission medium, such as optical fiber, coaxial cable, twisted-pair feeder; Remote router is to connect remote transmission medium, and requires corresponding equipment, wants the auxiliary tone modulator-demodulator such as telephone wire, wirelessly will pass through wireless receiver, transmitter.

Router is the main nodes equipment of the Internet.Router is by the forwarding of route determination data.Forwarding strategy is called Route Selection.As interconnected hinge between the heterogeneous networks, route system has consisted of the main body train of thought based on the Internet Internet of TCP/IP, also can say, router has consisted of the skeleton of Internet.Its processing speed is one of Main Bottleneck of network service, and its reliability then directly affects the quality of network interconnection.Therefore, in Campus Networks, single site network and even whole Internet research field, router technology is in core status all the time, and its development course and direction become the epitome that whole Internet studies.When the network infrastructure development of current China and information construction are in the ascendant, inquire into effect, status and the developing direction thereof of router in interference networks, for domestic network technology research, networking, and on the definite network market for the various specious concept of router and network interconnection, important meaning is arranged.

Router commonly used in order effectively to satisfy various functions, has adopted the powerful linux of network function to develop for its kernel, and for the demand of various function of surfing the Net, we need to conduct interviews, arrange, manage router feature.In these demands, the access router administration interface is an indispensable demand, and in access interface, the user always wishes simple, easy to remember, and is not easy to make mistakes.

IP address commonly used, uninteresting and be not easy note, the user and might revise after oneself forget, this has the domain name access function with regard to the route that needs us.And have in addition certain situation to be, up DHCP is closed, and at this moment needs one to have the user of certain technological know-how just can have access to route, and this just makes troubles to the user.

DynamicHost arranges agreement (Dynamic Host Configuration Protocol, DHCP) be the procotol of a local area network (LAN), the work of use udp protocol, mainly contain two purposes: to internal network or Internet service provider's automatic IP address allocation, give user or internal network keeper as the means of all computers being made central management.

Same router generally can be by arranging to divide the IP section of static address and dynamic address, such as general family expenses TP-LINK router, commonly from 192.168.1.100 ~ 192.168.1.254, if your computer is automatically to obtain IP like this, generally be exactly 192.168.1.100, next computer will automatically be assigned to by DHCP and be 192.168.1.101.And 192.168.1.2 ~ 192.168.1.99 is manual configuration IP section.

Dhcp client is for the first time after the Dynamic Host Configuration Protocol server end is rented the IP address, and this address of impermanent use, as long as lease expires, client must discharge (release) this IP address, uses to give other work station.Certainly, client can be than other main frame renewal (renew) lease more preferably, or rents other IP address.

At present, the domain name access that we commonly use, also only be in the situation that the DHCP unlatching conducts interviews, this domain name access, utilization be that Open Source Code dns-dproxy processes, obtain judgement with mailing to local DNS data, if local domain name, then resolve, return the managing I P of router, then can conduct interviews.

But there is a leak clearly in top access, in the situation that up DHCP is forgotten managing I P by artificial or close because of carelessness, how to log in administration interface.

Summary of the invention

To the objective of the invention is in order overcoming the above problems, to the invention provides a kind of router domain name access method.

Technical scheme of the present invention is: a kind of router domain name access method, and the method is suitable for using in the terminal of operating system as the windows system, when beginning domain name access, terminal may further comprise the steps,

Whether the DHCP of steps A, the up route of detection opens, and carries out domain name access if DHCP has opened then by normal domain name access mode, if DHCP does not open, then turns to step B;

Whether step B, the local hosts file of detection or netbios buffer memory have corresponding domain name, if having, then return IP address corresponding to this domain name, otherwise turn to step C;

Step C, send DNS bag and to network inquiry whether IP corresponding to domain name is arranged, if having then return this IP address; Otherwise turn to step D;

Whether step D, the same network segment is sent the NBNS protocol package, detecting has IP address corresponding to described territory; If have, then return corresponding routing management IP address, otherwise, can judge that network does not have routing device or be not this scheme routing device.

Further, in the above-mentioned router domain name access method: described method is based on the realteck chip platform, and the managing I P of routing device is 169.254.***.***.。

The invention solves the up DHCP of router and close, forgotten in the situation of managing I P the problem of access router administration interface.

Below in conjunction with specific embodiment the present invention is done comparatively detailed description.

Description of drawings

Fig. 1 is the overall flow figure that uses this method.

Embodiment

Embodiment 1, as shown in Figure 1, the present embodiment is a kind of based on the realteck chip platform, the managing I P of routing device is the flow process of the terminal domain name access of 169.254.***.***, mainly consider the sometimes situation of up CHCP when not opening for some reason, at present, terminal when carrying out unknown access, do not consider all that generally DHCP may not open, as shown in the figure: mainly may further comprise the steps:

1, terminal computer begins to carry out domain name access.

2, check whether up DHCP opens, if open then obtain IP address corresponding to this domain name by normal access module, and utilize IP address access corresponding to this domain name, the domain name access flow process finishes.Otherwise turn to next step continuation.

At present, judge whether DHCP opens, only need PC to take the IP address, can judge that up DHCP opens, otherwise, do not take the address, can think that then DHCP does not open, this time, the local connection icon of computer had an exclamation mark appearance, and these all are the processes of automatic decision, do not need our router to go to judge.

Whether have corresponding domain name, if having, then return IP address corresponding to this domain name if 3, detecting local hosts file or netbios buffer memory, and utilize IP address access corresponding to this domain name, and the domain name access flow process finishes.Otherwise turn to next step continuation.

Whether to network inquiry have IP corresponding to domain name, if having then return this IP address if 4, sending DNS bag; And utilize IP address access corresponding to this domain name, the domain name access flow process finishes.Otherwise turn to next step continuation.

Step 3 and step 4 are carried out the step that domain name mapping also may be passed through when DHCP opens.

5, the same network segment is sent the NBNS protocol package, detect whether IP address corresponding to described territory is arranged, if having, then return corresponding routing management IP address, and utilize IP address access corresponding to this domain name, the domain name access flow process finishes.Otherwise, can judge that network does not have routing device or not be this scheme routing device.

By the 5th step, this domain name access failure scenarios can not appear basically.Because the managing I P here is 169.254.***.***, an interim IP network section of this default allocation when PC distributes less than the address just, PC holds the NBNS bag that sends to be received like this, and we can respond to it by router.Unless the abnormal conditions that occur that route crashes, PC crashes, local connecting interface is unusual etc. and so on are just can return failure.

In the router of RTL scheme, when up distribute the address to PC end after, we adopt opensource Open Source Code dproxy-nexgen commonly used, in application layer, we add the hosts file, and managing I P and domain name are consisted of corresponding relation.This just can realize conventional domain name access function.Here Hosts is a system file that does not have extension name, can be with TOs such as notepads, its effect is exactly that the network address domain name that some are commonly used is set up one related " database " with its corresponding IP address, when the user inputs the network address of a needs login in browser, system can seek corresponding IP address at first automatically from the Hosts file, in case find, system can open corresponding webpage immediately, if do not find, then system can submit network address to the DNS name resolution server to carry out the parsing of IP address again.The meaning of dns-dproxy is the domain name agency; Dproxy-nexgen is a kind of domain name agency's Open Source Code.

In the situation that up DHCP closes, actual the giving of windows distributed acquiescence network segment 169.254.***.***, the IP of this network segment and our router is the same network segment, at this time, actual DNS request does not respond, the processing mode to domain name according to windows: at first can search local Hosts file and netbios cache, secondly can go to contact dns server and resolve.If these several modes all can't be finished parsing, then computer can send the NBNS packet.The NBNS bag is that all IP main frames of its same network segment are all sent out packet.But, because the NBNS bag can not be forwarded to the dproxy-nexgen module, so can't carry out domain name access.NBNS: network basic input/output (NetBIOS) name server (NBNS) agreement is the part of NetBIOS (NetBT) protocol suite on the TCP/IP, and it provides host name and address mapping method at the network based on the access of NetBIOS title.

This just need program again subprocess of pull-up process the nbns module, in the present embodiment, have specially a nbns subprocess to come data fetch packet.But, these not enough, consider that upstream router can connect outer net, NBNS packet rs destination address is not to be router, like this, it is up that the NBNS module can be forwarded to router at the bridge entrance, cause and can't access, therefore, we need to come read data packet with raw socket, raw socket can be got the data of data link layer, but at link layer, if find that destination address is not this router, can revise purpose MAC, cause packet to be correctly received, in order to accomplish normal reception, the present embodiment determines the protocol header port numbers and is 137 bag in the rtl8192cd_tx_clientMode of 8192cd_tx.c function, do not revise the mac address, 137 namely is the NBNS port numbers.

if(is_vlan_tag)

iph?=?((struct?iphdr?*)(skb->data+MACADDRLEN*2+4+2));

else

iph?=?((struct?iphdr?*)(skb->data+MACADDRLEN*2+2));

if(iph->protocol==0x11)//UDP

{

tcph=?(struct?tcphdr*)((__u32?*)iph?+?iph->ihl);

//if((tcph->dest==137)&&(tcph->source==137))

if((tcph->dest==137))

{

}

else

memcpy(skb->data+MACADDRLEN,?GET_MY_HWADDR,?MACADDRLEN);

}

else

memcpy(skb->data+MACADDRLEN,?GET_MY_HWADDR,?MACADDRLEN);

After receiving packet, process packet, first parsing, rear response.

When the agreement of the nbns that receives packet, resolve Name, need to carry out coding and decoding.This has the related data can be for reference.

When handle packet, separate one by one parsing MAC layer, IP layer, UDP layer, application layer.Then according to the UDP message bag, one by one to MAC IP UDP application layer group bag, hold response to PC, the PC end is deposited the result of name resolution in the buffer memory of netbios, access in 10 minutes, speed, but after a period of time, buffer memory is updated, and needs the long period again to obtain to respond.

Claims (2)

1. router domain name access method, the method is suitable for using in the terminal of operating system as the windows system, it is characterized in that: when beginning domain name access, terminal may further comprise the steps,

Whether the DHCP of steps A, the up route of detection opens, and carries out domain name access if DHCP has opened then by normal domain name access mode, if DHCP does not open, then turns to step B;

Whether step B, the local hosts file of detection or netbios buffer memory have corresponding domain name, if having, then return IP address corresponding to this domain name, otherwise turn to step C;

Step C, send DNS bag and to network inquiry whether IP corresponding to domain name is arranged, if having then return this IP address; Otherwise turn to step D;

Whether step D, the same network segment is sent the NBNS protocol package, detecting has IP address corresponding to described territory; If have, then return corresponding routing management IP address, otherwise, can judge that network does not have routing device or be not this scheme routing device.

2. router domain name access method according to claim 1, it is characterized in that: described method is based on the realteck chip platform, and the managing I P of routing device is 169.254.***.***.

Images