CN101895524B - LINUX-based method and network equipment enabling application program to access Internet - Google Patents
LINUX-based method and network equipment enabling application program to access Internet Download PDFInfo
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- CN101895524B CN101895524B CN200910107397.3A CN200910107397A CN101895524B CN 101895524 B CN101895524 B CN 101895524B CN 200910107397 A CN200910107397 A CN 200910107397A CN 101895524 B CN101895524 B CN 101895524B
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Abstract
The invention provides an LINUX-based method and network equipment enabling application program to access the Internet. The method comprises the following steps: adding a wired router in a routing table, determining that the network is in a wired connection mode or adding a wireless router in the routing table, determining that the network is in a wireless connection mode; and obtaining the IP address of the website in the determined connection mode, if not, switching the network connection mode to another connection mode to obtain the IP address of the website in the connection mode; and after obtaining the IP address of the website, establishing a SOCKET connection with the website. Therefore, application program can automatically select a connection under LINUX to access the Internet.
Description
Technical field
The present invention relates to network communications technology field, particularly a kind of application program to access Internet method and network equipment based on LINUX, so that under LINUX, application program is selected to connect and accessing Internet automatically.
Background technology
In the situation that (SuSE) Linux OS cable network and wireless network all exist, with the situation of the Internet may be just like several situations of following table 1:
Table 1:
| Cable network | × | √ | × | √ |
| Wireless network | × | × | √ | √ |
In rear three kinds of situations, can application program connect portal website and depend on the state of LINUX routing table at that time, because cable network and wireless network all exist, has two default options in routing table.The routing algorithm of LINUX is first default option of coupling, and when this default is cable network, and when now cable network really can connecting Internet, application program can successfully connect portal website; Otherwise if this default is cable network, and now cable network can not connecting Internet, even if wireless network can connect the Internet, application program can not successfully connect portal website.In the time that default is wireless network, be also in like manner.
For example,, when routing table is as the state of following table 2:
Table 2:
| Destination | Gateway | Genmask | Flags | Metric | Ref | Use | Iface |
| 10.120.105.0 | * | 255.255.255.0 | U | 0 | 0 | 0 | eth0 |
| 192.168.1.0 | * | 255.255.255.0 | U | 0 | 0 | 0 | ra0 |
| 127.0.0.0 | * | 255.0.0.0 | U | 0 | 0 | 0 | lo |
| default | 192.168.1.1 | 0.0.0.0 | UG | 0 | 0 | 0 | ra0 |
| default | 10.120.105.5 | 0.0.0.0 | UG | 0 | 0 | 0 | eth0 |
In table 2, first default is wireless network, second default is cable network, first default that LINUX only mates, be wireless network, now, the message that mails to the Internet can only send by the route of wireless network, in the time of wireless network energy connecting Internet, application program can connect portal website; Can not connecting Internet when wireless network, even if cable network can connect the Internet, application program can not successfully connect portal website.
Summary of the invention
The object of the invention is, the defect existing for above-mentioned prior art provides a kind of application program to access Internet method and network equipment based on LINUX, so that under LINUX, application program is selected to connect and accessing Internet by cable network or wireless network automatically.
Technical scheme of the present invention is as follows:
An application program to access Internet method based on LINUX, comprising:
Wired route is joined in routing table, determine that this network is wired connection mode or wireless routing is joined in routing table, determines that this network is wireless connections mode;
By obtaining IP address, website under this definite connected mode, if can not obtain described IP address, described internetwork connection mode is switched to another kind of connected mode, to obtain IP address, website under this another kind connected mode;
After obtaining IP address, website, set up SOCKET with website and be connected.
Wherein, the method further comprises: if with website set up SOCKET successful connection and successfully this SOCKET be set to unblock pattern, adopt described unblock pattern and website to connect.
Wherein, before wired route or wireless routing are joined in routing table, further comprise: judge in described routing table, whether have circuit by or wireless routing, if there is no, from internal memory, transfer described wired route or wireless routing and join in routing table.
Wherein, in the method, if described routing table exists two kinds of routes simultaneously, retain a kind of route, another kind of route is kept in internal memory, and from described routing table, delete described another kind of route.
Wherein, the method further comprises: call contiguous function and described website connects, if described contiguous function return value is correct, confirm that described network can connecting Internet.
Wherein, the method further comprises: call contiguous function and described website connects, if described contiguous function return value is correct, successful connection, if the mistake of returning connects unsuccessfully, detects whether success of described connection by choice function again; And at described choice function, time-out time is set, if overtime within the time of setting, confirm the failure of described network insertion the Internet.
Wherein, the method further comprises: if by after wired or the successful connection of wireless connections mode, record this connected mode and connect the required time, and judge whether to attempt another connected mode, if not,, attempt another kind of connected mode, record respectively connected mode and the time of this another kind connected mode;
Relatively wired connection mode and the required time of wireless connections mode access network, and the few connected mode of definite required time is preferred connected mode.
A kind of network equipment, comprising:
Internetwork connection mode determining unit, for wired route is joined to routing table, determines that this network is wired connection mode, or for wireless routing is joined to routing table, determines that this network is wireless connections mode;
IP address acquisition unit, for by obtaining IP address, website under this definite connected mode, if can not obtain described IP address, is switched to another kind of connected mode by described internetwork connection mode, to obtain IP address, website under this another kind connected mode;
Connect and set up unit, after obtaining IP address, website for described IP address acquisition unit, and between website, set up SOCKET and be connected.
Wherein, the described network equipment, also comprises:
Route judging unit, for judge described routing table whether have circuit by or wireless routing, if there is no, from internal memory, transfer described wired route or wireless routing and join in routing table.
Wherein, the described network equipment, also comprises:
Function calling cell, if for by call confirm function creation SOCKET and successfully described SOCKET be set to unblock pattern, adopt described unblock pattern and website to connect.
Wherein, described function calling cell, also for calling contiguous function and described website connects, if described contiguous function return value is correct, successful connection, if the mistake of returning, connect unsuccessfully, detect whether success of described connection by choice function again; And at described choice function, time-out time is set, if overtime within the time of setting, confirm the failure of described network insertion the Internet.
Wherein, this network equipment also comprises: record cell and comparing unit,
Described record cell, for: if by after wired or the successful connection of wireless connections mode, record this connected mode and connect the required time, and judge whether to attempt another connected mode, if not,, attempt another kind of connected mode; Record respectively connected mode and the time of this another kind connected mode;
Described comparing unit, for comparing wired connection mode and required time of wireless connections mode access network, and the few connected mode of definite required time is preferred connected mode.
Beneficial effect of the present invention is: the invention provides a kind of application program to access Internet method and network equipment based on LINUX, for cable network and wireless network, as long as there is one can connect the Internet, application program just can connect portal website.Meanwhile, when wired, wireless can connect upper the Internet time, automatic decision between the two any bar network to connect the situation of portal website more excellent, thereby make application program by carrying out information interaction between the better network of network speed and portal website.
Brief description of the drawings
The application program to access Internet method flow diagram based on LINUX that Fig. 1 provides for the embodiment of the present invention;
The network equipment structure chart that Fig. 2 provides for the embodiment of the present invention.
Embodiment
The invention provides a kind of application program to access Internet method and network equipment based on LINUX, for making object of the present invention, technical scheme and advantage clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
The application program to access Internet method based on LINUX that the embodiment of the present invention provides, be applied under LINUX system, wired route is joined in routing table, determine that this network is wired connection mode or wireless routing is joined in routing table, determines that this network is wireless connections mode; By obtaining IP address, website under this definite connected mode, if can not obtain described IP address, described internetwork connection mode is switched to another kind of connected mode, to obtain IP address, website under this another kind connected mode; After obtaining IP address, website, and between website, set up SOCKET and be connected.By the method for this embodiment, for cable network and wireless network, as long as there is one can connect the Internet, application program just can connect portal website.Meanwhile, when wired, wireless can connect upper the Internet time, automatic decision between the two any bar network to connect the situation of portal website more excellent, thereby make application program by carrying out information interaction between the better network of network speed and portal website.With reference to Fig. 1, should the application program to access Internet method based on LINUX comprise step:
101, judge in routing table, whether have circuit by or wireless routing, if there is no, from internal memory, transfer wired route or wireless routing and join in routing table.
If there are two kinds of routes in described routing table simultaneously, will retain a kind of route, another kind of route is kept in internal memory, and deletes another kind of route from described routing table.
In this step, be described by route is arranged to algorithm, this route arrange algorithm start time, first indicate in routing table be to remain with circuit by or retain wireless routing (both can only retain one).Remain with in this way circuit by, user wants wireless routing to delete from routing table, the default that makes routing table is only wired route.Now, first need to check in routing table, whether had circuit by, if there is no in wired route and internal memory, do not remain with yet circuit by information, route setup failed, algorithm finishes; If in routing table, do not have circuit by, but in internal memory, have the information of wired route, the wired routing iinformation in internal memory is returned in routing table, then carry out next step operation; If in routing table, have circuit by, directly carry out next step operation, check in routing table whether have wireless routing, if there is no wireless routing, setting completed, algorithm finishes; If existed, this wireless routing information is saved in internal memory, to call later, after preservation, this wireless routing to be deleted from routing table, algorithm finishes.What retain wireless routing is also in like manner.
102, wired route is joined in routing table, determine that this network is wired connection mode or wireless routing is joined in routing table, determines that this network is wireless connections mode.
This network is selected to realize by network selection algorithm, and the basis that this algorithm is set up is the SOCKET programming under LINUX, by and portal website between the SOCKET state that connects network is selected.In the present embodiment, preferably, this network selection algorithm first connected mode is set to by wired connection mode, then obtain the IP address of the machine under this connected mode by ioctl () built-in function, if can not correctly get the IP address of the machine, network state is switched to retry after wireless connections mode; Otherwise, call route algorithm is set, the route of cable network is joined in routing table, the route of wireless network is deleted from routing table.
103, by obtaining IP address, website under this definite connected mode, if can not obtain described IP address, described internetwork connection mode is switched to another kind of connected mode, to obtain IP address, website under this another kind connected mode.
Whether interpretation has got the IP address of portal website, as do not get, call gethostbyname () built-in function and obtain, as obtain failure, illustrate that this network can not be connected to the Internet, connected mode is switched to retry after wireless network; If obtained successfully, preserve the IP address of the portal website getting, in order to using next time.Get behind the IP address of portal website, this network selection algorithm is attempted between socket () function and portal website, setting up SOCKET and being connected by calling, if connect creates successfully and successfully this SOCKET be set to unblock pattern, the connect () that connects of trial employing unblock pattern and portal website; Otherwise, connected mode is switched to wireless network, and retry.
104,, after obtaining IP address, website, and between website, set up SOCKET and be connected.
Be to confirm that by calling function [as socket () function] creates SOCKET in the present embodiment, described socket () function return value is correct, and SOCKET creates successfully.
If 105 SOCKET create successfully and successfully this SOCKET be set to unblock pattern, adopt described unblock pattern and website to connect.
Wherein, the optional step that this step 105 is the present embodiment, if by call above-mentioned socket () function creation SOCKET success and successfully this SOCKET be set to unblock pattern, adopt described unblock pattern and website to connect.Set up three purposes below that are connected with of unblock: 1. can in shaking hands in system Zuo San road, do a little other things.2. can set up multiple connections by this technology simultaneously, very general in web application.3. can shorten the time-out time of connection.Application program sometimes need one shorter overtime, one of realizing method is exactly to use unblock to connect.
In the present embodiment: because SOCKET is set to unblock pattern, in the time calling contiguous function [as connect () function] and connect with portal website, this contiguous function can directly return.If return to successfully mark, this cable network can connect the Internet, and algorithm finishes.But when call connect () on the TCP of a unblock socket time, connect () may return to an EINPROGRESS mistake immediately, is illustrated in and connects but also do not complete.Then use choice function [as select () function] to detect this connection or success or failure, the time-out time of connection is set in select (), if select () is overtime, connection failure, connected mode is switched to wireless network, and retry; If select () success, use getsockopt () to check, whether judge this socket is really to connect, what in fact select () checked is whether it can write, and for writing, while meeting for following three kinds of arbitrary conditions of condition, all represent to write:
1) socket sends the currency that available control byte number in buffering area is more than or equal to socket and sends buffering area low tide limit, and or i) socket connect, or ii) socket do not require connection (UDP mode)
2) this is semi-closed for writing of connecting.
3) there is a socket mistake pending.
Therefore just need to obtain some current information of socket with getsockopt () function and judge whether it is really to connect upper portal website, if connected above, this cable network can connect the Internet.
If 106 by after wired or the successful connection of wireless connections mode, record this connected mode and connect the required time, and judge whether to attempt another connected mode, if not,, attempt another kind of connected mode, record respectively connected mode and the time of this another kind connected mode;
107, compare wired connection mode and required time of wireless connections mode access network, and the few connected mode of definite required time is preferred connected mode.
The optional step that wherein this step 106 and 107 is the present embodiment, in the present embodiment, preferably, first connected mode is set is that wired connection mode is (in other embodiment, also can first be set to wireless connections mode, content is below contrary), if carry out above-mentioned steps by the success of wired mode interconnection network, record this wired connection mode and needed time of interconnection network, and determine whether to carry out wireless connections mode; If do not carry out wireless connections mode, connected mode is switched to wireless connections mode, and retry, if carried out wireless connections mode, also record this wireless connections mode and needed time of interconnection network, the time that relatively wireless connections mode and wired connection mode respectively spend, determine which kind of connected mode optimum.So far, network selection algorithm finishes.
The embodiment of the present invention also provides a kind of network equipment, provides the method for the application program to access Internet based on LINUX for realizing above-described embodiment, and with reference to Fig. 2, this network equipment comprises:
Internetwork connection mode determining unit 201, for wired route is joined to routing table, determines that this network is wired connection mode or wireless routing is joined in routing table, determines that this network is wireless connections mode;
IP address acquisition unit 202, for by obtaining IP address, website under this definite connected mode, if can not obtain described IP address, is switched to another kind of connected mode by described internetwork connection mode, to obtain IP address, website under this another kind connected mode;
Connect and set up unit 203, after obtaining IP address, website for described IP address acquisition unit, and between website, set up SOCKET and be connected.
Further, in embodiment, this network equipment also comprises:
Further, in embodiment, this network equipment also comprises:
Further in embodiment, this function calling cell 205 is also for calling contiguous function and described website connects, if described contiguous function return value is correct, successful connection, if the mistake of returning, connects unsuccessfully, detect whether success of described connection by choice function again; And at described choice function, time-out time is set, if overtime within the time of setting, confirm the failure of described network insertion the Internet.
In a further embodiment, this network equipment also comprises: record cell 206 and comparing unit 207,
Described record cell 206, for: if by after wired or the successful connection of wireless connections mode, record this connected mode and connect the required time, and judge whether to attempt another connected mode, if not,, attempt another kind of connected mode; Record respectively connected mode and the time of this another kind connected mode;
Described comparing unit 207, for the result recording according to record cell 206, relatively wired connection mode and the required time of wireless connections mode access network, and the few connected mode of definite required time is preferred connected mode.
The network equipment that this embodiment provides is applied under LINUX system, and wired route is joined in routing table, determines that this network is wired connection mode or wireless routing is joined to wireless connections mode in routing table; By obtaining IP address in website under this connected mode, if can not obtain described IP address, call gethostbyname () built-in function and obtain described IP address, if can not, described internetwork connection mode is switched to another kind of connected mode, to obtain IP address, website under this another kind connected mode; After obtaining IP address, website, by calling socket () function creation SOCKET, and connect by connect () function and website.By the network equipment of this example, for cable network and wireless network, as long as there is one can connect the Internet, application program just can connect portal website.Meanwhile, when wired, wireless can connect upper the Internet time, automatic decision between the two any bar network to connect the situation of portal website more excellent, thereby make application program by carrying out information interaction between the better network of network speed and portal website.
It should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1. the application program to access Internet method based on LINUX, is characterized in that, comprising:
Wired route is joined in routing table, determine that this network is wired connection mode, or
Wireless routing is joined in routing table, determine that this network is wireless connections mode;
Obtain IP address, website under this definite connected mode, if can not obtain described IP address, described internetwork connection mode is switched to another kind of connected mode, to obtain IP address, website under this another kind connected mode; Whether interpretation has got the IP address of portal website, as do not get, call gethostbyname () built-in function and obtain, as obtain failure, illustrate that this network can not be connected to the Internet, connected mode is switched to retry after wireless network; If obtained successfully, preserve the IP address of the portal website getting, in order to using next time;
After obtaining IP address, website, set up SOCKET with website and be connected;
Above-mentioned network selects connected mode to realize by algorithm;
If after wired or the successful connection of wireless connections mode, record this connected mode and connect the required time, and judging whether to attempt another connected mode, if not,, attempt another kind of connected mode, record respectively connected mode and the time of this another kind connected mode;
Relatively wired connection mode and the required time of wireless connections mode access network, and the few connected mode of definite required time is preferred connected mode;
If with website set up SOCKET successful connection and successfully this SOCKET be set to unblock pattern, adopt described unblock pattern and website to connect;
Call contiguous function and described website connects; if described contiguous function return value is correct; successful connection; if from return value mistake; connect unsuccessfully, then detect whether success of described connection by choice function, and at described choice function, time-out time is set; if overtime within the time of setting, confirm the failure of described network insertion the Internet;
Described choice function is select () function;
The time-out time of connection is set in select (), if select () is overtime, connection failure, switches to wireless network by connected mode, and retry; If select () success, uses getsockopt () to check, judge this socket and whether connect.
2. the application program to access Internet method based on LINUX as claimed in claim 1, it is characterized in that, before wired route or wireless routing are joined in routing table, further comprise: judge in described routing table, whether have circuit by or wireless routing, if there is no, from internal memory, transferring described wired route or wireless routing joins in routing table.
3. the application program to access Internet method based on LINUX as claimed in claim 2, it is characterized in that, if described routing table exists two kinds of routes simultaneously, retain a kind of route, another kind of route is kept in internal memory, and from described routing table, deletes described another kind of route.
4. the application program to access Internet method based on LINUX as claimed in claim 1, is characterized in that, further comprises: return to confirmation parameter from described website, confirm that described network can connecting Internet.
5. a network equipment, is characterized in that, comprising:
Internetwork connection mode determining unit, for wired route is joined to routing table, determines that this network is wired connection mode, or for wireless routing is joined to routing table, determines that this network is wireless connections mode;
IP address acquisition unit, for by obtaining IP address, website under this definite connected mode, if can not obtain described IP address, is switched to another kind of connected mode by described internetwork connection mode, to obtain IP address, website under this another kind connected mode; Whether interpretation has got the IP address of portal website, as do not get, call gethostbyname () built-in function and obtain, as obtain failure, illustrate that this network can not be connected to the Internet, connected mode is switched to retry after wireless network; If obtained successfully, preserve the IP address of the portal website getting, in order to using next time;
Connect and set up unit, after obtaining IP address, website for described IP address acquisition unit, and between website, set up SOCKET and be connected;
Above-mentioned network selects connected mode to realize by algorithm;
Described equipment also comprises: record cell and comparing unit;
Described record cell, for: if by after wired or the successful connection of wireless connections mode, record this connected mode and connect the required time, and judge whether to attempt another connected mode, if not,, attempt another kind of connected mode; Record respectively connected mode and the time of this another kind connected mode;
Described comparing unit, for comparing wired connection mode and required time of wireless connections mode access network, and the few connected mode of definite required time is preferred connected mode;
Function calling cell; if for by call confirm to set up between function and portal website SOCKET successful connection and successfully described SOCKET be set to unblock pattern; adopt described unblock pattern and website to connect; if described confirmation function return value is correct, confirm that described network can connecting Internet;
Function calling cell, also for calling contiguous function and described website connects, if described contiguous function return value is correct, successful connection, if from described function return value mistake, connect unsuccessful,, then by choice function whether successfully to detect described connection; And at described choice function, time-out time is set, if overtime within the time of setting, confirm the failure of described network insertion the Internet;
Described choice function is select () function;
The time-out time of connection is set in select (), if select () is overtime, connection failure, switches to wireless network by connected mode, and retry; If select () success, uses getsockopt () to check, judge this socket and whether connect.
6. the network equipment as claimed in claim 5, is characterized in that, comprising:
Route judging unit, for judge described routing table whether have circuit by or wireless routing, if there is no, from internal memory, transfer described wired route or wireless routing and join in routing table.
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| CN109889409A (en) * | 2019-03-15 | 2019-06-14 | 深圳市领佳物联科技有限公司 | Cable network and wireless network double copies chain-circuit system and implementation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1764139A (en) * | 2004-09-14 | 2006-04-26 | 三星电子株式会社 | Communication adapter switching method and equipment |
| CN101213852A (en) * | 2005-06-07 | 2008-07-02 | 阿尔卡特朗讯公司 | Multimode mobile terminal with automatic selection of radio access network interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1764139A (en) * | 2004-09-14 | 2006-04-26 | 三星电子株式会社 | Communication adapter switching method and equipment |
| CN101213852A (en) * | 2005-06-07 | 2008-07-02 | 阿尔卡特朗讯公司 | Multimode mobile terminal with automatic selection of radio access network interface |
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