JP2016082470A - Server device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable resumption of communication without making a user of a terminal device perform complicated operation even if the user once terminated the communication in a communication system including: the terminal device that determines whether or not there is redirection which blocks access to a predetermined communication device and automatically starts communication if there is redirection; and a server device that cancels redirection triggered by detection of the start of the communication.SOLUTION: A server device comprises redirect revival means that detects the resumption of communication at a lower protocol layer than communication by a terminal device of which redirection is cancelled, and revitalizes the redirection of the terminal device triggered by detection of the resumption of communication at the lower protocol layer.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technique for providing a Web application to a user of a terminal device.

  With the widespread use of terminal devices equipped with web browsers such as smartphones, various web services are provided for these terminal devices. Among communication systems for providing Web services to terminal devices, there is a system that always changes (hereinafter, redirects) an access destination to a specific portal site regardless of which site is accessed. Such a portal site is called “Captive Portal” and is often used for authentication of an access source terminal device. The web page of such a portal site for authentication is often provided with an input field for allowing a user to input account information such as a user name and a password, and the account information input via the web page is stored in the web page. If it matches the pre-registered one, the redirect is canceled and free access is permitted. Such an authentication method for inputting account information via a Web page is called “Web authentication”. Also, canceling the redirect means not to forcibly change the access destination.

  Some terminal devices have a function called CPD (Captive Portal Detection) so as to save the trouble of manually starting a Web browser during Web authentication. The terminal device provided with the CPD checks the presence or absence of redirection as described below, triggered by detection of the connection of the device itself to the network. The terminal device attempts to access a predetermined Web page (for example, a Web page of a site operated by the manufacturer of the terminal device and established on the Internet) in the background. When the terminal device can access the Web page, it determines that there is no redirect, and when data representing a Web page other than the Web page (specifically, the Web page of the Captive Portal) is returned. It is determined that there is a redirect. If it is determined that there is a redirect, the terminal device starts a Web browser and displays a Web page of the Captive Portal. As a result, two operations such as starting the browser and inputting a URI (Uniform Resource Identifier) for Web authentication can be omitted.

  CPD is a function for saving the trouble of starting a browser during Web authentication, but can also be used as means for automatically starting a Web application. Web applications refer to various functions and services provided by application programs that run on a browser. For example, if the application program is embedded in the Web page of Captive Portal, the Web application can be used simply by connecting the terminal device to the network. As described above, if there is no CPD, operations such as starting a browser and inputting a URI are required, so there is a great merit that these two operations can be omitted.

JP 2000-231524 A

  Captive Portal is often used for Web authentication, and once authentication is successful, there is no need to restore redirects as soon as possible. For this reason, in the conventional communication system having the Captive Portal, the redirect is often restored when a predetermined timeout period elapses from the time when the redirect is canceled. However, in such an aspect, after redirection is released, the user closes the browser for some reason, temporarily stops browsing the web page, etc., and then resumes web access before the timeout period elapses. In addition, there is a problem that it is necessary for the user to perform complicated operations such as starting a browser and inputting a URI. This is because CPD does not function because redirection is canceled when Web access is resumed. Such a problem is not limited to the automatic activation of the browser using CPD, and the application layer is automatically determined when there is a redirect by determining the presence or absence of a redirect that inhibits access to a predetermined communication device. If the communication system includes a terminal device that starts communication and a server device that releases redirection triggered by the detection of the start of the communication, the same occurs.

  The present invention has been made in view of the above problems, and a terminal device that determines whether or not there is a redirect that inhibits access to a predetermined communication device and automatically starts communication when there is a redirect. In a communication system including a server device that releases redirection triggered by the detection of the start of the communication, even if the communication is once terminated, the communication can be performed without causing the user to perform a complicated operation. The object is to provide a technology that enables resumption.

  In order to solve the above problems, the present invention is triggered by the detection of reception of an access request transmitted to a predetermined destination from a terminal device that is inaccessible to a predetermined first communication device. , Redirection execution means for returning data urging access to the predetermined second communication device to the transmission source of the access request, and release of redirection by the redirection execution means for the terminal device of the access request transmission source There is provided a server device comprising: a redirection canceling unit for performing redirection, and a reinstatement resuming unit for reinstating the redirect for the terminal device prior to restart of communication by the terminal device for which the redirection has been cancelled.

  Here, as a specific example of the redirect recovery mode by the redirect recovery unit, a protocol layer lower than the communication (if the communication is a Web browser access, a protocol layer lower than the application layer in the OSI reference model (specifically, Includes a mode in which redirection is restored when triggered by the detection that the terminal device has started communication in the network layer or data link layer)). Note that the start of communication in the lower protocol layer may be detected, for example, by receiving a frame because an IP (Internet Protocol) address has been assigned to a terminal device, or because an IP address has been assigned. . As another specific example of the redirect recovery mode by the redirect recovery means, there is a mode in which the redirect is recovered upon detection that the communication restart instruction is given to the terminal device. For example, a vibration sensor is provided in the terminal device, and an operation of shaking the terminal device is determined as an operation for instructing restart of the communication, and the communication is performed in a lower protocol layer than the communication. When an operation to instruct resumption is performed, the server device may be notified from the terminal device that the operation has been performed by communication in the lower protocol layer.

  According to such a server device, even if the redirect for the terminal device is canceled, the redirect is restored prior to the restart of communication by the terminal device. Here, when the terminal device is a device having a CPD function and the first communication device is a device at a predetermined site operated by the manufacturer of the terminal device, the communication of the terminal device is resumed. At that time, the first communication device cannot be accessed, and access to the second communication device is resumed without performing operations such as activation of a browser or input of a URI by the CPD function. The second communication device may be an authentication device for Web authentication, or may be an application server for providing some Web application. The second communication device may be a device separate from the server device, or the same device as the server device (for example, the authentication module provided in the server device is the second communication device). In some cases). When the second communication device is an authentication device, the server device may be configured to cancel the redirect on the condition that the second communication device is authenticated.

  Patent Document 1 discloses a technique for restoring a previously accessed page at the time of reconnection when accessing a WWW server via a dial-up connection from a terminal having a browser function. However, the technique disclosed in Patent Document 1 is not a technique for automatically starting a browser using CPD, but is a technique completely different from the present invention.

  The terminal device may be a terminal device connected by wire to the network, or may be a wireless terminal device connected wirelessly. When the terminal device is connected to the network via a signal line or the like, communication of the terminal device is performed according to attachment / detachment of the signal line (or opening / closing of a port to which the signal line is connected in a hub or the like). It is sufficient to detect the end and resumption of. When the terminal device is a wireless terminal device, a wireless access point device may be included in the network. In this case, a program for causing the transmission destination terminal device to execute a process for responding to polling from the server device is embedded in the data to be transmitted to the redirect execution means, and the browser device of the terminal device is polled in the server device. The termination may be detected and the wireless access point device may be instructed to disconnect the wireless connection for the terminal device. According to such an aspect, when the execution of the browser is once terminated for some reason, the wireless connection between the terminal device and the wireless access point device is disconnected when the termination is detected (that is, , Communication in the lower protocol layer than the Web access is completed). Therefore, when resuming access to the second Web page, it is necessary to reconnect the terminal device to the wireless access point device, and the reconnection (resumption of communication in the lower protocol layer) is detected. The redirect will be revived. According to such an aspect, even when the browser is terminated during access to the second communication device in the wireless terminal device equipped with CPD, the user can perform operations such as restarting the browser and inputting a URI. It is possible to reliably resume Web access to the second communication device without making it.

  In order to solve the above-described problem, the present invention determines whether or not access to a predetermined first communication apparatus is possible, and transmits an access request to a predetermined destination when access is impossible 1 Alternatively, a first redirect that returns data that prompts access to a predetermined second communication device to a transmission source of the access request triggered by detection of reception of the access request with a plurality of terminal devices. A server device having a redirect executing unit to execute, a redirect canceling unit to cancel the first redirect for the transmission source, and an access request transmitted from each of the one or more terminal devices is always the server A second redirection executing means for executing a second redirection so as to be transferred to the apparatus. The communication apparatus includes a redirection reviving unit that revives the first redirection for the terminal device when the resumption of communication by the terminal device for which the first redirection has been canceled is detected. System.

  The above problem can also be solved by such an aspect. In addition, the CPS server apparatus in a communication system including a conventional CPS (Captive Portal System) server apparatus (a CPS server apparatus that restores redirection upon detection of the elapse of a predetermined timeout period after cancellation of redirection) By replacing with the server device of the invention, the existing communication system can function as the communication system of the present invention. As a specific example of the second redirect execution means, there is a DNS (Domain Name System) server device that is set to return the IP address of the CPS server device for all inquiries.

  In the communication system, the access request transmitted from the terminal device is always transferred to the CPS server device by the second redirection. For this reason, when the first communication device is a device other than the server device, the terminal device can access the first communication device regardless of the presence or absence of the first redirect. Therefore, it is always erroneously determined that there is a redirect. Therefore, if it is necessary to determine whether or not there is a redirect depending on whether or not access to the first communication device is possible and the terminal device needs to execute a predetermined process when there is no redirect, the terminal device that has released the redirect The server device is provided with proxy response means for performing a proxy response instead of the first communication device when there is an access to the first communication device, and the terminal device is redirected when the proxy response is received. It can be determined that there is none.

As another aspect of the present invention, an aspect of providing a program that causes a computer such as a CPU (Central Processing Unit) to function as the redirect execution unit, the redirect release unit, and the redirect recovery unit is also considered. It is done. By operating the computer in accordance with such a program, the computer can function as the server device of the present invention. For example, by installing the program in a conventional CPS server apparatus and operating the control unit according to the program, the CPS server apparatus can function as the server apparatus of the present invention. As a specific form of providing such a program, a CD-ROM (Compact Disk-Read Only Memory) or a DVD (Digital
Versatile Disc), a mode in which data is written and distributed on a computer-readable recording medium such as an SD memory card, and a mode in which data is distributed by downloading via a telecommunication line such as the Internet are conceivable.

It is a block diagram which shows the structural example of the communication system 1 of one Embodiment of this invention. 2 is a block diagram illustrating a configuration example of a CPS server device 10 included in the communication system 1. FIG. It is a figure which shows an example of the storage content of the terminal management table 142a stored in the volatile memory | storage part 142 of the CPS server apparatus 10. FIG. It is a sequence diagram which shows the operation example of this embodiment. It is a sequence diagram which shows the operation example of this embodiment. It is a figure which shows the communication system of a modification (3).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(A: Configuration)
FIG. 1 is a block diagram illustrating a configuration example of a communication system 1 according to an embodiment of the present invention.
As shown in FIG. 1, the communication system 1 includes a CPS server device 10, a DNS server device 20, a DHCP (Dynamic Host Configuration) respectively connected to a LAN (Local Area Network) 50.
Protocol) includes a server device 30, a wireless access point (hereinafter abbreviated as “AP”) device 40, and a terminal device 60 that is a wireless terminal device wirelessly connected to the wireless AP device 40. Although only one terminal device 60 is illustrated in FIG. 1, a plurality of terminal devices 60 may be wirelessly connected to the wireless AP device 40. In FIG. 1, only one wireless AP device 40 is illustrated, but a plurality of wireless AP devices 40 may be connected to the LAN 50.

  The DNS server device 20 is not particularly different from a general DNS server device. However, in the present embodiment, the DNS server apparatus 20 is set to return the IP address of the CPS server apparatus 10 in response to all inquiries for address resolution (identification of the IP address corresponding to the domain name). . The DHCP server device 30 is not particularly different from a general DHCP server device, and is a device that dynamically assigns an IP address to the terminal device 60 wirelessly connected to the wireless AP device 40. However, for the DHCP server device 30, each time an IP address is assigned, a log indicating the assignment result (for example, data including the assigned IP address and the MAC (Media Access Control) address of the assigned destination: Syslog below) ) Is transmitted to the CPS server device 10 in advance. The IP address is a communication address that uniquely identifies each device in the third layer (network layer) of the OSI reference model, and the MAC address is a communication that uniquely identifies each device in the second layer (data link layer). Address. The MAC address is determined to be a unique value for each device at the time of factory shipment of each device.

  The terminal device 60 is, for example, a smartphone. The terminal device 60 has a call function for making and receiving calls via a mobile telephone network (not shown), a function for establishing a wireless communication link with the wireless AP device 40, and a program execution function. The terminal device 60 realizes a wireless connection to the wireless AP device 40 by establishing a wireless communication link with the wireless AP device 40. Various programs such as a mailer and a browser are preinstalled in the terminal device 60, and the terminal device 60 can execute these programs using the program execution function.

  The terminal device 60 has the CPD function described above. The terminal device 60 attempts to establish a wireless connection to the wireless AP device 40 using the above-described wireless communication function when the operation of designating the SSID of the wireless AP device 40 has been performed. When the wireless connection to the wireless AP device 40 is successful, the terminal device 60 accesses the DHCP server device 30 to receive an IP address assignment, and determines the presence or absence of redirection by the above-described CPD function. Specifically, the terminal device 60 determines whether or not access to a predetermined Web page is possible, and activates a browser and transmits a predetermined access request when access is impossible. The access destination URI or the like in this access request may be appropriately set to an arbitrary value. Prior to the transmission of the access request, the terminal device 60 inquires the DNS server device 20 about the resolution of the IP address for the access destination by the access request. As described above, since the DNS server device 20 is set to return the IP address of the CPS server device 10 for all inquiries, all access requests from the browser of the terminal device 60 are all CPS servers. Redirected to device 10.

  The CPS server device 10 has a Web server function, and when the access request is received, the CPS server device 10 replaces the URI of the access destination of the access request with access to data representing a predetermined Web page. Reply to the sender of the request. That is, in the communication system 1 illustrated in FIG. 1, the access request transmitted from the terminal device 60 is subjected to two-stage redirection by the DNS server device 20 and the CPS server device 10. Hereinafter, redirection by the CPS server device 10 is referred to as “first redirection”, and redirection by the DNS server device 20 is referred to as “second redirection”.

  As an example of the Web page represented by the data transmitted from the CPS server device 10 to the terminal device 60 by the first redirection, the above-described Web page for Web authentication (hereinafter referred to as an authentication page) can be cited. The CPS server device 10 performs Web authentication based on the account information input via this authentication page. When the CPS server device 10 succeeds in authenticating the terminal device 60 (or its user), the CPS server device 10 cancels the first redirect for the terminal device 60 and at the same time a Web page in which a predetermined Web application is embedded (hereinafter referred to as a main page). Page) data is transmitted to the terminal device 60, and the user of the terminal device 60 uses the Web application.

  In the present embodiment, the LAN 50 is laid in, for example, a restaurant where a fireworks display can be viewed, and the Web application is a music application that causes the terminal device 60 to play music played in accordance with the fireworks display in the fireworks display. The application program for realizing this music application includes waveform data of each of a plurality of music to be reproduced in accordance with the program progress of the fireworks display and a time chart indicating the reproduction start time of each waveform data. . Account information for the web authentication is distributed to the customers of the restaurant, and each visitor can use the web application using their own smartphone. That is, it is possible to appreciate fireworks while listening to music that is played back according to a music application.

When the browser execution is temporarily interrupted while watching the fireworks while listening to music as described above (for example, when the browser execution is terminated to activate the smartphone camera to shoot the fireworks) In a conventional system with CPS, the user can restart the browser or restart the music application in a traditional system with CPS (e.g. It was necessary to perform operations such as inputting the URI of the music application (that is, the URI of the main page described above). On the other hand, in this embodiment, by causing the CPS server apparatus 10 to execute processing that clearly shows the features of the present invention, the user can perform operations such as restarting the browser and inputting the URI of the Web application. It is possible to resume the use of music applications.
Hereinafter, the CPS server apparatus 10 that clearly shows the features of the present embodiment will be mainly described.

FIG. 2 is a block diagram illustrating a configuration example of the CPS server device 10.
As shown in FIG. 2, the CPS server apparatus 10 includes a control unit 110, a communication interface (hereinafter referred to as “I / F”) unit 120, a timer 130, a storage unit 140, and a bus that mediates data exchange between these components. 150.

  The control unit 110 is a CPU, for example. The control unit 110 functions as a control center of the CPS server device 10 by executing the CPS control program 144b stored in the storage unit 140 (more precisely, the nonvolatile storage unit 144). Details of functions realized by the control unit 110 in accordance with the CPS control program 144b will be clarified later. The communication I / F unit 120 is a NIC (Network Interface Card), for example, and is connected to the LAN 50. The communication I / F unit 120 receives data transmitted from the LAN 50 and delivers it to the control unit 110, while sending the data delivered from the control unit 110 to the LAN 50. The timer 130 is a real time clock, for example. In response to a request from the control unit 110, the timer 130 provides the control unit 110 with date / time data indicating the date and time when the request is made.

  The storage unit 140 includes a volatile storage unit 142 and a nonvolatile storage unit 144 as illustrated in FIG. The volatile storage unit 142 is, for example, a RAM (Random Access Memory). The volatile storage unit 142 is used by the control unit 110 as a work area when executing the CPS control program 144b. The volatile storage unit 142 stores a terminal management table 142a. The stored contents of the terminal management table 142a are updated by the control unit 110 operating according to the CPS control program 144b.

  FIG. 3 is a diagram illustrating an example of the contents stored in the terminal management table 142a. The terminal management table 142a is associated with a terminal identifier (in this embodiment, an IP address) that uniquely indicates each terminal device that is wirelessly connected to the wireless AP device 40, and the most recent authentication success date and time for the terminal device. And date / time data indicating the presence / absence of the first redirect described above. If the value of the authentication date / time data is an initial value (NULL in this embodiment, that is, 0x00), it indicates that the terminal device indicated by the terminal identifier corresponding to the authentication date / time data has not been authenticated. The redirect presence flag is set to 0 if the first redirect is canceled for the terminal device indicated by the terminal identifier corresponding to the redirect presence flag (that is, if there is no redirect), and the first redirect is set. If is not released (that is, if there is a redirect), 1 is set.

  That is, the stored content of the terminal management table 142a indicates whether each terminal device wirelessly connected to the wireless AP device 40 has been authenticated and whether the first redirect has been canceled. . For example, in the example shown in FIG. 3, the terminal device whose IP address is “192.168.1.1” is not authenticated and the first redirect has not been released. For the terminal device of 192.168.1.2 ”, the IP address is“ 192.168.1. 1 ”indicating that it has been authenticated on the MM month DD1 of YY and that the first redirect has not been released. The terminal device that is 3 ″ indicates that it has been authenticated on the MM month DD2 of YY and the first redirect has been canceled.

  The non-volatile storage unit 144 is, for example, a flash ROM (Read Only Memory) or a hard disk. In addition to the CPS control program 144b described above, the nonvolatile storage unit 144 stores data specific to the CPS server device 10. Specific examples of data unique to the CPS server device 10 include Web page data 144a made up of Web page data (for example, HTML data) represented by the authentication page, main page, and proxy response page described later. . An application program for realizing the music application described above is embedded in the Web page data of the main page. This application program is a program for causing the terminal device 60 to execute in parallel a process of reproducing each of a plurality of music according to the above-described time chart and a process of responding to polling from the CPS server apparatus 10.

  The control unit 110 reads out the CPS control program 144b from the non-volatile storage unit 144 to the volatile storage unit 142 when triggered by detection of power-on (not shown in FIG. 2) or reset of the CPS server device 10, and starts to execute the program. To do. The control unit 110 operating according to the CPS control program 144b detects the wireless connection of the terminal device to the wireless AP device 40 by receiving the Syslog transmitted from the DHCP server device 30, and this connection is the first connection. Or whether it is a reconnection. Specifically, if the IP address included in the Syslog is not registered in the terminal management table 142a, it is determined that the connection is the first time. If the control unit 110 determines that the connection is the first time, the IP address included in the Syslog is used as a terminal identifier, NULL (ie, 0x00) is set in the authentication date and time data, and a redirect presence / absence flag is set. 1 is created, and the record is additionally registered in the terminal management table 142a. Conversely, when it is determined that the connection is reconnection, the control unit 110 functions as a redirect recovery means (see FIG. 1). The control unit 110 operating according to the CPS control program 144b also functions as a redirect execution unit, a redirect release unit, a proxy response unit, and a disconnection instruction unit illustrated in FIG. The outline of each of these means is as follows.

  The control unit 110 operating in accordance with the CPS control program 144b has released the first redirect with respect to the source of the access request, triggered by the detection that the access request has been received via the communication I / F unit 120. It is determined with reference to the stored contents of the terminal management table 142a. Specifically, if the value of the redirect presence / absence flag stored in the terminal management table 142a in association with the terminal identifier indicating the transmission source of the access request is 0, the control unit 110 sets the first transmission source for the transmission source. It is determined that the redirect has been canceled. If the value of the redirect presence / absence flag is 1, it is determined that the first redirect has not been canceled. Then, the control unit 110 functions as a redirect execution unit when the first redirect has not been canceled for the transmission source of the access request, and as a proxy response unit when the first redirect has been canceled. Function.

  The redirect execution means determines whether or not the transmission source of the access request has been authenticated with reference to the stored contents of the terminal management table 142a. Here, “authenticated” means that the authentication date / time data stored in the terminal management table 142a in association with the terminal identifier of the access request transmission source is not NULL and the date / time when the access request is received (by the timer 130). Acquisition) is a date and time within a predetermined authentication timeout period starting from the date and time indicated by the authentication date and time data. If it has not been authenticated, the redirect execution means sends the Web page data of the authentication page to the transmission source of the access request (in this embodiment, the terminal device 60) regardless of the URI specified by the access request. Perform a first redirect to reply to. Then, when the authentication is successful through the authentication page, the redirect execution unit accesses the timer 130 to acquire date and time data, and stores the authentication stored in the terminal management table 144a in association with the terminal identifier of the transmission source. The date / time data is updated with the date / time data acquired as described above, and the Web data of the main page is transmitted to the transmission source. On the other hand, if it has been authenticated, the redirect execution means returns a first redirect for returning the Web page data of the main page to the source of the access request regardless of the URI specified by the access request. Execute. The authentication via the authentication page may be performed by an authentication module separate from the redirect execution unit, and the redirect execution unit may execute only the first redirect.

  The redirect cancellation unit updates the stored content of the terminal management table 142a upon detection of successful authentication via the authentication page, and cancels the first redirect for the access request transmission source. Specifically, the redirect release unit updates the value of the redirect presence / absence flag stored in the terminal management table 142a in association with the terminal identifier of the access request transmission source from 1 to 0.

  The proxy response means reads the Web page data of the proxy response page from the nonvolatile storage unit 144 and returns it to the transmission source of the access request. In the present embodiment, since the second redirection by the DNS server device 20 is always executed even if the terminal device has the first redirection canceled by the redirection canceling unit, the terminal device is used to confirm the presence or absence of the redirection. The access request transmitted from the terminal does not reach its destination, and there is a risk that an erroneous determination is made regarding the presence or absence of redirection. The proxy response means is provided in order to avoid such an erroneous determination.

  The disconnection instructing unit performs the above-described polling, and the wireless connection of the terminal device 60 is triggered by detecting the end of the browser in the terminal device 60 by the polling (that is, the response to the polling is not returned). Is instructed to the wireless AP device 40, and the DHCP server device 30 is instructed to release the IP address assigned to the terminal device 60. The wireless AP device 40 disconnects the wireless communication link with the terminal device 60 in response to the instruction, and the DHCP server device 30 releases the corresponding IP address in response to the instruction. Since such a disconnection instruction unit is provided in the CPS server device 10, in this embodiment, the terminal device 60 that is using the music application temporarily terminates the execution of the browser for some reason, and then uses the music application. In the case of restarting, the user of the terminal device 60 reconnects the terminal device 60 to the wireless AP device 40 and receives an IP address assignment again (that is, restarts communication in a protocol layer lower than the application layer). There is a need.

The redirect reviving means is a terminal device 60 in which communication in the lower protocol layer (specifically, the third layer (that is, the network layer) in the OSI reference model) is released from the first redirect than the transmission / reception of the access request. The first redirect for the terminal device 60 is revived when triggered by the detection of the restart. Specifically, the redirect recovery means updates the value of the redirect presence / absence flag stored in the terminal management table 142a in association with the terminal identifier of the terminal device 60 from 0 to 1 to restore the first redirect. Let The redirect recovery means of this embodiment detects the resumption of communication in the lower protocol layer than the transmission / reception of the access request by the reassignment of the IP address by the DHCP server device 30, but the reconnection to the wireless AP device 40 ( That is, the detection may be performed by the second layer (that is, the data link layer) communication restart in the OSI reference model) or may be detected by receiving the ARP transmitted from the terminal device 60.
The above is the configuration of the CPS server device 10.

(B: Operation)
The operation of this embodiment will be described below with reference to the drawings. In the following, the operation of each device will be described taking as an example the case where the user of the terminal device 60 first visits the restaurant where the communication system 1 is laid and uses the music application.

  FIG. 4 is a sequence diagram showing a flow of communication executed by each device at the first connection to the wireless AP device 40. The user of the terminal device 60 who has come to the restaurant sits at the guided seat and inputs the SSID of the wireless AP device 40 to the terminal device 60 in order to use the music application. The terminal device 60 to which the SSID is input in this way is wirelessly connected to the wireless AP device 40 (FIG. 4: S100). When the wireless connection is successful, the terminal device 60 communicates with the DHCP server device 30 (FIG. 4: S102). Get assigned.

  When the DHCP server device 30 completes the assignment of the IP address to the terminal device 60, the DHCP server device 30 transmits a Syslog including the IP address to the CPS server device 10 (FIG. 4: S104). The control unit 110 of the CPS server device 10 additionally registers a record including the IP address of the terminal device 60 as a terminal identifier in the terminal management table 142a when the reception of the Syslog is detected. In this operation example, since the terminal device 60 is wirelessly connected to the wireless AP device 40 for the first time, an initial value (NULL) is set in the authentication date and time data and 1 is set in the redirect presence / absence flag at the time of the additional registration. Is done.

  On the other hand, when the IP address assignment by the DHCP server device 30 is completed, the terminal device 60 determines the presence or absence of redirection based on the above-described CPD in the background. In this operation example, since the access request transmitted from the terminal device 60 receives the second redirect by the DNS server device 20 and the first redirect by the CPS server device 10, the terminal device 60 determines that there is a redirect, The browser is activated and a predetermined access request is transmitted (FIG. 4: S106).

  When receiving the access request, the CPS server apparatus 10 executes the processing by the redirect execution means because the redirect of the access request transmission source has not been cancelled. In this operation example, since the terminal device 60 has not been authenticated, communication for web authentication is first executed by the redirect execution means (FIG. 4: S108). More specifically, the redirect execution means The Web page data of the authentication page is returned to the terminal device 60. The terminal device 60 displays a terminal authentication page according to the Web page data. The user of the terminal device 60 inputs the account information distributed when visiting the store into the input field of the terminal authentication page. The redirect execution means performs authentication using the account information input in this way.

  When the redirection executing means succeeds in the authentication of the terminal device 60, the redirect execution means updates the authentication date and time data stored in the terminal management table 142a in association with the terminal identifier of the access request transmission source, and the Web page data of the main page Is transmitted to the terminal device 60 (FIG. 4: S110). The first redirect for the terminal device 60 is canceled by the redirect canceling means triggered by detecting the success of the authentication. Specifically, the redirect release unit updates the value of the redirect presence / absence flag registered in the terminal management table 142a in association with the terminal identifier of the terminal device 60 to 0. On the other hand, when the terminal device 60 receives the Web page data of the main page, the terminal device 60 starts executing the application program embedded in the main page and realizes the music application. Thereafter, in the CPS server device 10, polling (FIG. 4: S112) by the disconnection instruction unit is started. The above is the communication flow performed by each device when the terminal device 60 is connected to the wireless AP device 40 for the first time.

  Next, the operation of each device will be described by taking as an example a case where the user who has started using the music application in the above manner once quits the browser in order to capture fireworks. FIG. 5 is a sequence diagram showing a flow of communication executed by each device when the browser device has been executed on the terminal device 60. As shown in FIG. 5, when the execution of the browser in the terminal device 60 is terminated, a response to the polling (FIG. 5: S200) from the CPS server device 10 is not returned. The disconnection instructing means of the CPS server device 10 detects the end of the browser in the terminal device 60 triggered by the detection of the interruption of the response to the polling, and notifies the wireless AP device 40 of the polling partner device (that is, the terminal device). 60) (step S202 in FIG. 5) and the DHCP server device 30 is instructed to release the IP address assigned to the partner device. The wireless AP device 40 disconnects the wireless connection with the terminal device 60 in response to the instruction, and the DHCP server device 30 releases the IP address assigned to the terminal device 60 in response to the instruction.

  When the user of the terminal device 60 completes the shooting of fireworks, the user grasps the disconnection from the wireless AP device 40 by a message displayed on the display unit or the like of the terminal device 60. In this way, the user who grasps the disconnection from the wireless AP device 40 inputs the SSID of the wireless AP device 40 to the terminal device 60 again and instructs reconnection. The terminal device 60 instructed to reconnect in this way wirelessly connects to the wireless AP device 40 (FIG. 5: S204), and communicates with the DHCP server device 30 (FIG. 5: S206) upon successful wireless connection. The IP address assigned at the time is reassigned. When the DHCP server device 30 completes the assignment of the IP address to the terminal device 60, the DHCP server device 30 transmits a Syslog including the IP address to the CPS server device 10 (FIG. 5: S208).

  The redirect restoring means of the CPS server device 10 detects the reassignment of the IP address to the terminal device 60 by receiving the Syslog, and restores the first redirect for the terminal device 60. Specifically, the control unit 110 updates the value of the redirection presence / absence flag of the record including the IP address included in the Syslog as a terminal identifier to 1.

  On the other hand, when the terminal device 60 completes the assignment of the IP address by the DHCP server device 30, the terminal device 60 determines in the background whether or not there is a redirect based on the CPD described above. In this operation example, since the first redirect for the terminal device 60 has been restored, the terminal device 60 determines that there is a redirect, activates the browser, and transmits a predetermined access request (FIG. 5: S210). When the CPS server apparatus 10 receives the access request, since the redirect is not released for the transmission source of the access request, the first redirect by the redirect execution unit is executed (FIG. 5: S212). Here, if the time required from the time when the terminal device 60 is initially connected to the wireless AP device 40 to the transmission of the access request is sufficiently short and the authentication timeout period has not elapsed, the redirect executing means skips the web authentication. Web page data of the main page is transmitted. When the terminal device 60 receives the Web page data of the main page, the terminal device 60 starts executing the application program embedded in the main page and restarts the music application.

  As described above, according to the present embodiment, even when the use of the music application is temporarily suspended for capturing fireworks and resumed after the completion of imaging, the browser is started, the URI of the main page is input, etc. Even if the above operation is not performed, the browser is automatically activated by the CPD, and the execution of the music application is resumed. As described above, according to the present embodiment, when access to a predetermined Web page is interrupted in a terminal device equipped with CPD, the user is allowed to perform operations such as starting a Web browser and inputting a URI. It is possible to resume access to the Web page without any change.

(C: deformation)
Although the embodiment of the present invention has been described above, it goes without saying that the following modifications may be added to this embodiment.
(1) In the above embodiment, the terminal device 60 is a smartphone, but may be a portable game machine as long as it is a terminal device that can be wirelessly connected to the LAN 50 and has a browser function. A personal computer may be used. In the above embodiment, the case where the terminal device 60 is wirelessly connected to the LAN 50 has been described. However, the terminal device 60 may be connected in a wired manner, and may be connected to the terminal device 60 that is wirelessly connected to the LAN 50. 60 may be mixed.

(2) In the above embodiment, each of the DNS server device 20 and the DHCP server device 30 is separate from the CPS server device 10, but either one (or both) of the DNS server device 20 and the DHCP server device 30. These functions may be combined with the CPS server device 10. In the above embodiment, the CPS server apparatus 10 authenticates the transmission source of the access request. However, an authentication apparatus that performs the authentication may be provided separately from the CPS server apparatus 10. In this case, the CPS server apparatus 10 In this case, instead of the Web page data of the authentication page, data prompting access to the authentication device (for example, character string data representing the URI of the authentication device) may be returned. In the above-described embodiment, a case has been described in which the presence / absence of redirection is determined using CPD (that is, depending on whether or not HTTP communication with a predetermined destination is possible by starting a browser in the background). However, the presence / absence of redirection may be determined based on whether or not communication conforming to a predetermined communication device and a communication protocol other than HTTP is possible. That is, CPS (or CPD) is not a premise of the present invention. In short, it is determined whether or not there is a redirect that inhibits access to a predetermined communication device, and when there is a redirect, a terminal device that automatically starts communication such as Web access and the start of the communication is detected. If the communication system includes a server device that releases redirection as an opportunity, apply the present invention (that is, prior to resuming communication by the terminal device that has been released from redirection (for example, lower order than the above communication). By providing the server device with a redirect recovery means for recovering the redirect for the terminal device (provided that the protocol layer communication is started), communication of the upper protocol layer such as Web access is temporarily terminated. Even if it is, the communication can be resumed without causing the user to perform complicated operations. It becomes possible.

(3) In the above embodiment, each of the redirect execution means, the redirect release means, the redirect recovery process, the disconnection instruction means, and the proxy response means is realized by a software module. However, each means is realized by a hardware module such as an electronic circuit. The server device of the present invention may be realized by combining these means. The proxy response means is not always essential and may be omitted. Further, if the terminal device 60 is connected in a wired manner to the LAN 50, it is not necessary to provide a disconnection instruction means in the server device. If the fixed IP address is assigned to the terminal device 60, the DHCP server device 30 is used. It goes without saying that can be omitted.

  Therefore, as a minimum configuration of the communication system 1 of the present invention, as shown in FIG. 6, it is applied to a predetermined first communication device (for example, a device that distributes the data of the first Web page described above). Access to a predetermined second communication device (for example, an authentication device, etc.) triggered by detection of reception of an access request and a terminal device 60 that transmits a predetermined access request when access is impossible A server apparatus 10 ′ having a redirect executing means for executing a first redirect for returning data prompting to the sender of the access request, and a redirect releasing means for releasing the first redirect for the sender, A second redirect that executes a second redirect so that an access request transmitted from the terminal device 60 is always transferred to the server device 10 '. And the server device 10 ′ performs the first redirection for the terminal device 60 prior to the restart of communication by the terminal device 60 for which the first redirection has been cancelled. And a configuration further including a redirect recovery means for recovering.

(4) In the above embodiment, the IP address is used as the terminal identifier stored in the terminal management table 142a. Generally, when reconnecting after disconnecting the wireless connection of the terminal device 60 to the wireless AP device 40, the same IP address as before the disconnection is often assigned, but disconnecting and reconnecting many terminal devices 60 However, the same IP address as before the disconnection is not always assigned to each terminal device 60. When an IP address different from that before disconnection is assigned to each terminal device 60, there is a possibility that the stored contents of the terminal management table 142 a may not actually follow in the aspect using the IP address as the terminal identifier.

  Therefore, in the case where such a situation is expected (for example, when providing a music application for a fireworks display held from New Year's Eve to New Year's Day: In this case, 0:00 When it is considered that disconnection and reconnection are concentrated in the vicinity of the time), the MAC address may be used as the terminal identifier. Also, switching between using an IP address or a MAC address as a terminal identifier may be performed according to a time zone. When providing a music application for the fireworks display held from New Year's Eve to New Year's Day as described above, the MAC address is used as the terminal identifier for 30 minutes before and after midnight on the New Year's Day, and for other time zones An IP address may be used as the terminal identifier.

(5) In the above embodiment, the application example of the present invention to the communication system that provides the music application that reproduces the musical sound in synchronization with the fireworks launch has been described. However, the application target of the present invention is not limited to such a communication system, and may be a communication system that provides other applications. In the above embodiment, the Web page data of the main page is transmitted only to the terminal device preceding the Web authentication. However, the Web authentication may be omitted, and conversely, a communication system that uses the CPS only for the Web authentication. The present invention may be applied to. That is, the web page redirected by the CPS server device 10 may be a web page for web authentication, or may be a web page in which an application other than the music application is embedded. Moreover, although the aspect which detects the termination | terminus of a browser by polling was demonstrated in the said embodiment, the termination | terminus of a browser is transmitted by transmitting a predetermined | prescribed termination message from the terminal device 60 to the CPS server apparatus 10 prior to the termination | terminus at the time of a browser termination. You may make it notify.

DESCRIPTION OF SYMBOLS 1 ... Communication system, 10 ... CPS server apparatus, 10 '... Server apparatus, 110 ... Control part, 120 ... Communication I / F part, 130 ... Timer, 140 ... Memory | storage part, 142 ... Volatile memory | storage part, 142a ... Terminal management Table 144, nonvolatile storage unit 144a, Web page data, 144b CPS control program, 150 bus, 20 DNS server device, 30 DHCP server device, 40 wireless AP device, 50 LAN, 60 terminal apparatus.

Claims (9)

Triggered by detection of an access request transmitted from a terminal device that has been inaccessible to a predetermined first communication device to a predetermined destination, to a predetermined second communication device Redirect execution means for returning data prompting access to the sender of the access request;
Redirection cancellation means for canceling redirection by the redirect execution means for the terminal device that is the source of the access request;
Prior to resuming communication by the terminal device for which the redirection has been canceled, redirect resumption means for reviving the redirect for the terminal device;
The server apparatus characterized by having. The server device according to claim 1, wherein the redirect recovery unit recovers the redirect in response to detection that the terminal device has started communication in a lower protocol layer than the communication. The server device according to claim 1, wherein the redirect reviving unit restores the redirect in response to detection that the communication restart instruction is given to the terminal device. The second communication device is an authentication device that performs authentication of an access source,
The server device according to any one of claims 1 to 3, wherein the redirect canceling unit cancels the redirect for the terminal device authenticated by the authentication device. 5. The proxy response unit according to claim 1, further comprising: a proxy response unit that responds on behalf of the first communication device when there is an access from a terminal device for which the redirection has been cancelled. Server device. The terminal device is a wireless terminal device that determines whether or not access to the first communication device is possible when triggered by wireless connection to a wireless access point device,
In the data transmitted by the redirect execution means for urging access to the second communication device, an application program for executing processing in response to polling from the device at the transmission destination of the data is embedded,
Characterized by having disconnection instruction means for instructing the wireless access point device of the connection destination to disconnect the wireless connection of the wireless terminal device when the end of communication by the wireless terminal device is detected by the polling. The server device according to any one of claims 1 to 5. One or a plurality of terminal devices that determine whether or not access to a predetermined first communication device is possible, and that transmits an access request to a predetermined destination when access is impossible;
Retrieving means for executing a first redirect for returning data urging access to a predetermined second communication device to a transmission source of the access request, triggered by detection of reception of the access request; Redirection cancellation means for canceling the first redirection for the transmission source;
In a communication system comprising: a second redirect execution unit that executes a second redirect so that an access request transmitted from each of the one or more terminal devices is always transferred to the server device;
The server device
A re-communication means for re-establishing the first redirect for the terminal device prior to resuming communication by the terminal device for which the first re-direction has been canceled. The first communication device transmits first Web page data to an access request transmission source, while the second communication device transmits second Web page data to an access request transmission source;
Each of the one or more terminal devices launches a browser when the first communication device is inaccessible;
The communication system according to claim 7, wherein the server device is a CPS (Captive Portal System) server device. Computer
Triggered by detection of an access request transmitted from a terminal device that has been inaccessible to a predetermined first communication device to a predetermined destination, to a predetermined second communication device Redirect execution means for returning data prompting access to the sender of the access request;
Redirection cancellation means for canceling redirection by the redirect execution means for the terminal device that is the source of the access request;
Redirection revival means for revitalizing the redirect for the terminal device prior to resuming communication by the terminal device for which the redirection has been canceled;
A program characterized by making it function.

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