JP2011253352A - Communication terminal and telegraphic message processing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication terminal capable of implementing a telegraphic message transmitted via an unapproved communication network, and a telegraphic message processing method for the same.SOLUTION: A telegraphic message processing method comprises a step of judging, when a telegraphic message is transmitted from any one of a plurality of communication networks, whether or not the communication network having transmitted the telegraphic message is a predetermined communication network (S1); a step of implementing the telegraphic message if the judgment is YES at the step S1 (S5): a step of judging whether or not an alteration identifier is contained in the telegraphic message if the judgment is NO at the step S1 (S7); a step of discarding the telegraphic message if the judgment is NO at the step S7 (S9); and a step of implementing the telegraphic message if the judgment is YES at the step 7 (S5).

Description

  The present invention relates to a communication terminal capable of executing a message transmitted from a communication network that is not permitted to execute a message, and a message processing method thereof.

  2. Description of the Related Art Conventionally, there is a communication terminal including a plurality of communication units, that is, a communication unit that performs communication via, for example, a Bluetooth communication network and a communication unit that performs communication via a wireless LAN communication network.

  In addition, there is a communication terminal that can receive a message transmitted from a certain communication network, but prohibits execution of a command in the message and access to data by executing such a command (see Patent Document 1).

  There is also a disclosure of a communication system that communicates via a plurality of communication networks in stages. Japanese Patent Application Laid-Open No. H10-260260 discloses a device that uses an infrared communication network and a mobile phone network. Some use a Bluetooth communication network and a wireless telephone network.

Some use electric field communication (see Non-Patent Documents 1 and 2).

Special Table 2002-53904 Publication Japanese Patent Laid-Open No. 2003-70079

“Redacton Usage Scene” [online], Nippon Telegraph and Telephone Corporation, Internet <URL: http: // redtacton. com / jp / field / 03. html> “IT Glossary Binary Electric Field Communication” [online], Internet <URL: http: // www. sophia-it. com / content /% E9% 9B% BB% E7% 95% 8C% E9% 80% 9A% E4% BF% A1>

  FIG. 12 is a diagram illustrating a configuration example of a conventional communication system.

  In the communication terminal 200 of the communication system of FIG. 12, the message transmitted from the communication network A is normally discarded. That is, the execution of a message transmitted from the communication network A is not permitted.

  On the other hand, in the communication terminal 200, execution of a message transmitted from the communication network B is permitted.

  In this case, the white list 221 stored in the storage unit 22 of the communication terminal 2 does not include the communication network identifier “A” indicating the communication network A, but includes the communication network identifier “B” indicating the communication network B.

  For example, the message creation unit 11B configured in the communication unit 1B of the communication terminal 100 creates a message for the communication network B, and the communication unit 1B transmits the message to the communication unit 2B via the communication network B.

  The communication unit 2B transmits the transmitted message to the control unit 21. The determination unit 211 of the control unit 21 determines whether or not the whitelist 221 has a communication network identifier indicating the communication network that has transmitted the message. Since the white list 221 includes the communication network identifier “B” indicating the communication network B, the electronic message processing unit 212 executes the command stored in the payload of the electronic message or accesses the storage unit 22 based on the content of the payload ( Content rewriting) (hereinafter collectively referred to as “execution of telegram”).

  On the other hand, the message creation unit 11A configured in the communication unit 1A of the communication terminal 100 creates a message for the communication network A, and the communication unit 1A transmits the message to the communication unit 2A via the communication network A.

  The communication unit 2A transmits the transmitted message to the control unit 21. The determination unit 211 of the control unit 21 determines whether or not the whitelist 221 has a communication network identifier indicating the communication network that has transmitted the message. Since the whitelist 221 does not have the communication network identifier “A” indicating the communication network A, the message processing unit 212 discards the message.

  In the communication system of FIG. 12, for example, when the communication network B cannot be used due to a failure, the communication terminal 200 cannot receive a message via the communication network B.

  In communication terminal 200, since the message transmitted from communication network A is discarded, the message transmitted from communication terminal 100 or the like cannot be executed.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication terminal capable of executing a message transmitted from a communication network that is not permitted to execute a message, and a message processing method thereof. There is to do.

  In order to solve the above-mentioned problem, the first aspect of the present invention is a communication terminal capable of communicating via a plurality of communication networks, and if a message is transmitted from any of the plurality of communication networks, the message Means for determining whether or not the communication network that transmitted the message is a predetermined communication network, and executes the message if it is determined that the communication network that transmitted the message is a predetermined communication network And if it is determined that the communication network that has transmitted the message is not a predetermined communication network, whether or not the message includes a change identifier indicating that the message is from a communication network that is not the original communication network. Means for determining, and if it is determined that the message does not have the change identifier, means for suppressing execution of the message; If it is determined that there is the change identifier in the serial message, characterized in that it comprises means for executing the message.

  For example, if it is determined that the communication network that has transmitted the message is a predetermined communication network, the communication terminal transmits the message and means for determining whether or not the change identifier is in the message. If the determined communication network is determined to be a predetermined communication network and it is determined that the change identifier is in the electronic message, the means for executing the electronic message only when a predetermined condition is satisfied With.

  The second aspect of the present invention is a communication terminal capable of communicating via a plurality of communication networks, and if a message is transmitted from any of the plurality of communication networks, a communication network that transmits the message is determined in advance. Means for determining whether the communication network is a communication network, and if the communication network that transmitted the message is determined to be a predetermined communication network, the means for executing the message and the communication that transmitted the message If it is determined that the network is not a predetermined communication network, means for determining whether or not the message includes a change identifier indicating that the message is from a communication network that is not the original communication network; If it is determined that there is no change identifier, means for suppressing execution of the message, and the change identifier is included in the message. If it is determined, the means for determining whether or not the original communication network indicated by the electronic message is a predetermined communication network, and the original communication network indicated by the electronic message is a predetermined communication Means for executing the message if it is determined to be a network, and means for suppressing execution of the message if it is determined that the original communication network indicated by the message is not a predetermined communication network; It is characterized by providing.

  The third aspect of the present invention is a communication terminal capable of communicating via a plurality of communication networks, and if a message is transmitted from any of the plurality of communication networks, a communication network that transmits the message is determined in advance. Means for determining whether the communication network is a communication network, and if the communication network that transmitted the message is determined to be a predetermined communication network, the means for executing the message and the communication that transmitted the message If it is determined that the network is not a predetermined communication network, means for determining whether or not the message includes a change identifier indicating that the message is from a communication network that is not the original communication network; If it is determined that there is no change identifier, means for suppressing execution of the message, and the change identifier is included in the message. Means for determining whether or not the communication unit identifier in the message indicating the communication unit that created the message before the change identifier is given to the message is a predetermined communication unit identifier. If the communication unit identifier in the message is determined not to be a predetermined communication unit identifier, the means for suppressing execution of the message and the communication unit identifier in the message are a predetermined communication unit identifier. If it is determined that there is, means for determining whether or not the original communication network indicated by the electronic message is a predetermined communication network, and the original communication network indicated by the electronic message is predetermined. If it is determined that the network is a communication network, the means for executing the message and the original communication network indicated by the message are predetermined communication networks. If it is determined not to be over-click, characterized in that it comprises a means for inhibiting execution of the telegram.

  For example, if it is determined that the communication network that transmitted the message is a predetermined communication network, the means for executing the message determines whether or not the change identifier is in the message, and the change identifier Is determined not to be in the message, the message is executed.

  A fourth aspect of the present invention is a telegram processing method for a communication terminal capable of communicating via a plurality of communication networks, wherein if the telegram is transmitted from any of the plurality of communication networks, the telegram Determining whether or not the communication network that transmitted the message is a predetermined communication network, and executing the message if it is determined that the communication network that transmitted the message is a predetermined communication network And when the communication terminal determines that the communication network that has transmitted the message is not a predetermined communication network, a change identifier indicating that the message is from a communication network that is not the original communication network is included in the message. Determining whether or not the communication terminal determines that the change identifier is not included in the message. If it is determined, the step of suppressing the execution of the message, and if the communication terminal determines that the change identifier exists in the message, it is necessary for the execution or suppression of the message in the step of executing the message It is characterized by executing various steps.

  A fifth aspect of the present invention is a telegram processing method for a communication terminal capable of communicating via a plurality of communication networks, wherein the communication terminal transmits a telegram if the telegram is transmitted from any of the plurality of communication networks. Determining whether or not the communication network that transmitted the message is a predetermined communication network, and executing the message if it is determined that the communication network that transmitted the message is a predetermined communication network And when the communication terminal determines that the communication network that has transmitted the message is not a predetermined communication network, a change identifier indicating that the message is from a communication network that is not the original communication network is included in the message. Determining whether or not the communication terminal determines that the change identifier is not included in the message. If so, the step of suppressing execution of the message, and if the communication terminal determines that the change identifier exists in the message, the original communication network indicated by the message is a predetermined communication network. Determining whether or not the communication terminal is determined that the original communication network indicated by the message is a predetermined communication network, executing the message; and If the communication terminal determines that the original communication network indicated by the message is not a predetermined communication network, the steps necessary for the execution or suppression of the message in the step of suppressing the execution of the message are performed. It is characterized by performing.

  The sixth aspect of the present invention is a telegram processing method for a communication terminal capable of communicating via a plurality of communication networks, and if a telegram is transmitted from any of the plurality of communication networks, the communication network that transmits the telegram Determining whether the communication network is a predetermined communication network, executing the electronic message if it is determined that the communication network that has transmitted the electronic message is a predetermined communication network, and the electronic message If it is determined that the communication network that has transmitted is not a predetermined communication network, the step of determining whether or not there is a change identifier in the message indicating that the message is from a communication network that is not the original communication network; If it is determined that the change identifier does not exist in the message, the step of suppressing execution of the message; If it is determined that the message has the change identifier, the communication unit identifier in the message indicating the communication unit that created the message before the change identifier is given to the message is a predetermined communication unit identifier. Determining whether there is a communication unit identifier in the message, and determining that the communication unit identifier in the message is not a predetermined communication unit identifier; suppressing the execution of the message; and a communication unit identifier in the message If it is determined that the communication unit identifier is predetermined, the step of determining whether or not the original communication network indicated by the electronic message is a predetermined communication network; and the original communication indicated by the electronic message If the communication network is determined to be a predetermined communication network, the step of executing the message and the book indicated by the message If the communication network is determined not to be the communication network a predetermined, and executes the steps necessary to perform or suppression of the telegram in the step of suppressing the execution of the telegram.

  According to the present invention, a message transmitted from a communication network that is not permitted to execute a message can be executed.

It is a block diagram of the communication system which concerns on 1st Embodiment. It is a figure which shows the example of the content of the white list. It is a figure which shows the example of the content of the message | telegram processing method memory | storage part 222. FIG. It is a flowchart which shows operation | movement of the control part 21 when a message | telegram is transmitted to the communication terminal 2. FIG. It is a figure which shows a mode that a change identifier is provided to a message | telegram. It is a block diagram of the communication system which concerns on the modification in 1st Embodiment. It is a block diagram of the communication system which concerns on 2nd Embodiment. It is a figure showing an example of contents of white list 222A. It is a flowchart which shows operation | movement of the control part 21 when a message | telegram is transmitted to the communication terminal 20. FIG. It is a figure which shows a mode that a change identifier etc. are provided to a message | telegram. It is a block diagram of the communication system which concerns on the modification in 2nd Embodiment. It is a figure which shows the structural example of the conventional communication system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a configuration diagram of a communication system according to the first embodiment.

  The communication system includes a communication terminal 1 and a communication terminal 2 that can communicate via communication networks A and B. Although not shown, the communication system further includes a communication terminal. The communication network A is, for example, a Bluetooth communication network, and the communication network B is, for example, a wireless LAN communication network.

  The communication terminal 1 includes a communication unit 1A that performs communication via the communication network A and a communication unit 1B that performs communication via the communication network B. The communication unit 1A includes a message creation unit 11A for the communication network A. The communication unit 1B includes a message creation unit 11B for the communication network B, and an identifier adding unit that adds a change identifier indicating that the message is transmitted via a communication network that is not the original communication network to the message for the communication network B. 12B.

  For example, an identifier set to one of a value indicating that a message is transmitted via a communication network that is not an original communication network and a value indicating that a message is transmitted via an original communication network is the former. If the message is included in the message, there is a change identifier in the message. On the other hand, when the identifier set to the latter value is in the message, there is no change identifier in the message.

  The communication terminal 2 includes a communication unit 2A that performs communication via the communication network A, a communication unit 2B that performs communication via the communication network B, a control unit 21 that processes a message transmitted to each of the communication units 2A and 2B, a message A storage unit 22 for storing a list and various data used for the above processing.

  The communication units 1A and 2A can communicate with each other via the communication network A, and the communication units 1B and 2B can communicate with each other via the communication network B.

  On the other hand, the communication units 1A and 2B cannot communicate with each other, and the communication units 1B and 2A cannot communicate with each other.

  The control unit 21 includes a determination unit 211 that determines whether or not a message is transmitted from a communication network that is permitted to execute a message, and a message processing unit 212 that processes the message according to a change identifier or the like given to the message. Prepare.

  The storage unit 22 includes a white list 221 in which a communication network identifier indicating a communication network permitted to execute a message is stored, and a message processing method storage unit 222 in which a method for processing a message is stored.

  FIG. 2 is a diagram illustrating an example of the content of the white list 221.

  The white list 221 includes a communication network identifier “B” indicating the communication network B. This indicates that the communication terminal 2 is permitted to execute a message transmitted from the communication network B.

  On the other hand, the white list 221 does not include the communication network identifier “A” indicating the communication network A. The communication terminal 2 is not permitted to execute a message transmitted from the communication network A except for an exception such as an emergency.

  FIG. 3 is a diagram illustrating an example of the contents of the message processing method storage unit 222.

  The processing method 222A in the case where the communication network identifier indicating the communication network that has transmitted the message is in the white list 221 and the change identifier is present in the message, and the communication network identifier that indicates the communication network that has transmitted the message is not in the white list 221 And a processing method 222B in the case where there is a change identifier in the message.

  The processing method 222A indicates that the message is to be discarded. The processing method 222B is that the execution of the command stored in the payload of the message or the access to the storage unit 22 based on the content of the payload (content rewriting, etc.) (that is, the execution of the message) is permitted. Indicates that a predetermined restriction is imposed (execution is not permitted unless a predetermined condition is satisfied).

  Note that discarding a message is an aspect of suppressing the execution of the message, and the message may not be executed. Hereinafter, the same applies to disposal.

  FIG. 4 is a flowchart showing the operation of the control unit 21 when a message is transmitted to the communication terminal 2.

  The determination unit 211 determines whether a communication network identifier indicating the communication network that has transmitted the electronic message is in the white list 221 (S1).

  If it is determined that the communication network identifier indicating the communication network that transmitted the message is in the white list 221 (S1: YES), the message processing unit 212 determines whether the message has a change identifier (S3). . If there is no change identifier in the message (S3: NO), the message processing unit 212 executes the message (S5) and ends the process.

  If it is determined that the communication network identifier indicating the communication network that has transmitted the message is not in the white list 221 (S1: NO), the message processing unit 212 determines whether the message has a change identifier (S7). . If there is no change identifier in the message (S7: NO), the message processing unit 212 discards the message (S9) and ends the process.

  If the message processing unit 212 determines in step S3 that the message has a change identifier (S3: YES), the whitelist 221 has a communication network identifier indicating the communication network that has transmitted the message, and the message has a change identifier. If the processing method 222A is read from the message processing method storage unit 222 and it is determined in step S7 that the message has a change identifier (S7: YES), the communication network identifier indicating the communication network that has transmitted the message Is not in the white list 221, and the processing method 222B when the message has a change identifier is read from the message processing method storage unit 222 (S11).

  The message processing unit 212 determines whether or not the read processing method indicates that the execution of the message is permitted (S13).

  If the read processing method does not indicate that the execution of the message is permitted (S13: NO), the message processing unit 212 discards the message (S9) and ends the process.

  If the read processing method indicates that the execution of the message is permitted (S13: YES), the message processing unit 212 indicates that the read processing method imposes a predetermined restriction on the execution of the message. It is determined whether or not it is indicated (S15).

  If the processing method that has been read indicates that a predetermined restriction is imposed on the execution of the message (S15: YES), the message processing unit 212 only receives the message if the predetermined condition is satisfied. Execute (S17) and finish the process.

  If the read processing method does not indicate that a predetermined restriction is imposed on the execution of the message (S15: NO), the message processing unit 212 executes the message (S5) and ends the process.

(Operation in the first embodiment)
Next, operations in the first embodiment will be described with reference to FIGS. 1, 4, and 5.

  FIG. 5 is a diagram illustrating a state in which a change identifier is assigned to a message.

  Here, for example, the communication network B cannot be used due to a failure, and therefore, an operation of transmitting / receiving a message for the communication network B via the communication network A will be described.

  In FIG. 1, the message creation unit 11B creates a message for the communication network B and transmits the message to the identifier assigning unit 12B. The identifier assigning unit 12B assigns a change identifier to the message. The communication unit 1B transmits a message with the change identifier to the communication unit 1A.

  That is, as shown in FIG. 5, the message creation unit 11B creates a message including a header for the communication network B and a payload having a desired content. The identifier assigning unit 12B uses the header for the communication network B and the change identifier as the header for the communication network A, and creates a message including the header for the communication network A and the payload. The communication unit 1B transmits a message to the communication unit 1A.

  Returning to FIG. 1, the communication unit 1A transmits the message transmitted from the communication unit 1B to the communication unit 2A via the communication network A.

  The communication unit 2A transmits the transmitted message to the control unit 21. According to the flowchart of FIG. 4, the determination unit 211 determines whether or not the communication network identifier indicating the communication network that has transmitted the message is in the white list 221 (S1). Since the whitelist 221 does not have the communication network identifier “A” indicating the communication network A (S1: NO), the message processing unit 212 determines whether the message has a change identifier (S7).

  Since the message processing unit 212 has a change identifier in the message (S7: YES), the message processing unit 212 uses the processing method 222B when the communication network identifier indicating the communication network that has transmitted the message is not in the white list 221 and the message has a change identifier. Read from the message processing method storage unit 222 (S11). The message processing unit 212 determines whether or not the read processing method indicates that the execution of the message is permitted (S13). Since the message processing unit 212 indicates that the processing method 222B permits the execution of the message (S13: YES), the read processing method indicates that a predetermined restriction is imposed on the execution of the message. It is determined whether it is a thing (S15).

  The message processing unit 212 indicates that the read processing method 222B imposes a predetermined restriction on the execution of the message (S15: YES). Therefore, the message processing unit 212 only receives a message when a predetermined condition is satisfied. Execute (S17) and finish the process.

  If the processing method 222B does not indicate that a predetermined restriction is imposed on the execution of the message (S15: NO), the message processing unit 212 simply executes the message (S5) and ends the process.

  If the processing method 222B does not indicate that the execution of the message is permitted (S13: NO), the message processing unit 212 discards the message (S9) and ends the process.

  In addition, the message processing unit 212 has transmitted a message if the white list 221 has a communication network identifier “A” indicating the communication network A (S1: YES), and if the message has a change identifier (S3: YES). The processing method 222A when the communication network identifier indicating the communication network is in the white list 221 and the message has a change identifier is read from the message processing method storage unit 222 (S11). The subsequent processing is the same as that described above.

  In addition, when the message created by the message creation unit 11B is transmitted from the communication unit 1B to the communication unit 2B via the communication network B, the message processing unit 212 determines YES in S1 and NO in S3. Is executed (S5), and the process ends.

  In addition, when a message created by the message creation unit 11A is transmitted from the communication unit 1A to the communication unit 2A via the communication network A, it is determined NO in S1 and NO in S3. Is discarded (S9), and the process ends.

  If it is known in advance in step S3 that it is determined that there is no change identifier in the message, the message may be executed immediately without performing step S3.

  If it is determined in step S7 that the change identifier is included in the message (S7: YES), if it is known in advance that the message is created by the communication unit 1B, for example, step S11 is performed. , S13, S15, etc. may not be performed, and the message may be executed immediately.

(Modification in the first embodiment)
FIG. 6 is a configuration diagram of a communication system according to a modification example of the first embodiment.

  The difference from the configuration of FIG. 1 is that the change identifier is assigned by the communication terminal 1 in the communication system of FIG. 1, whereas the change identifier is provided between the communication networks A and B in the communication system of FIG. 3 to give.

  In FIG. 6, the message creation unit 11B creates a message for the communication network B. As shown in FIG. 5, the communication unit 1 </ b> B transmits a message including a header for the communication network B and a payload having a desired content to the relay device 3 via the communication network B. The identifier assigning unit 3A of the relay device 3 uses the header for the communication network B and the change identifier as a header for the communication network A, and creates a message including the header and the payload. The relay device 3 transmits a message to the communication unit 2A via the communication network A.

  Hereinafter, the processing in the communication terminal 2 is the same as that in the communication system of FIG.

  As described above, according to the first embodiment, when a message is transmitted from any of a plurality of communication networks, the communication terminal 2 is a communication network in which the communication network that transmitted the message is predetermined. If it is determined that the communication network that transmitted the message is a predetermined communication network (S1: YES), the message execution unit (S5), and the message If it is determined that the transmitted communication network is not a predetermined communication network (S1: NO), it is determined whether or not the message has a change identifier indicating that the message is from a communication network that is not the original communication network. If it is determined that there is no change identifier in the means (S7) and the message (S7: NO), the means (S9) for suppressing execution of the message and the message are changed. If it is determined that there is an identifier (S7: YES), since it includes means (S5) for executing a message, even if it is determined that the communication network that transmitted the message is not a predetermined communication network (S1: NO), a message can be executed.

  If the communication terminal 2 determines that the communication network that transmitted the message is a predetermined communication network (S1: YES), the communication terminal 2 determines whether the change identifier is in the message (S3). If it is determined that the change identifier is in the electronic message (S3: YES), it is provided with means (S13, S15, S17, S5) for executing the electronic message only when a predetermined condition is satisfied. Depending on the conditions, a degree of freedom can be given to the execution mode of the message.

  If it is determined that the communication network that has transmitted the message is a predetermined communication network (S1: YES), the communication terminal 2 determines whether or not the change identifier is in the message (S3). If it is determined that the identifier is not in the electronic message (S3: NO), the electronic message is executed (S5). Therefore, in executing the electronic message, the communication network that transmitted the electronic message is the original communication network and a predetermined communication. Confirmation that it is a network is obtained.

  In the first embodiment, the white list 221 storing the communication network identifier indicating the communication network permitted to execute the message is used. However, the communication network indicating the communication network not permitted to execute the message. A black list in which identifiers are stored may be used.

(Second Embodiment)
FIG. 7 is a configuration diagram of a communication system according to the second embodiment.

  In the second embodiment, the same or similar elements as those of the communication system according to the first embodiment are denoted by the same reference numerals and description thereof is omitted, and differences from the first embodiment are mainly described. Explained.

  The communication system includes a communication terminal 10 and a communication terminal 20 that can communicate via communication networks A and B. Although not shown, the communication system further includes a communication terminal.

  The communication terminal 10 includes a communication unit 1A that performs communication via the communication network A and a communication unit 1B that performs communication via the communication network B. The communication unit 1A includes a message creation unit 11A for the communication network A. The communication unit 1B adds a message creation unit 11B for the communication network B, a change identifier, a communication unit identifier indicating the communication unit 1B, and a communication network identifier “B” indicating the communication network B used by the communication unit 1B to the message. An identifier assigning unit 12B is provided.

  The communication terminal 20 includes a communication unit 2A that performs communication via the communication network A, a communication unit 2B that performs communication via the communication network B, a control unit 21 that processes messages transmitted to the communication units 2A and 2B, A storage unit 22 for storing a list and various data used for the above processing.

  The communication units 1A and 2A can communicate with each other via the communication network A, and the communication units 1B and 2B can communicate with each other via the communication network B.

  On the other hand, the communication units 1A and 2B cannot communicate with each other, and the communication units 1B and 2A cannot communicate with each other.

  The control unit 21 includes a determination unit 211 that determines whether or not a message is transmitted from a communication network that is permitted to execute a message, and a message processing unit 212 that processes the message according to a change identifier or the like given to the message. Prepare.

  The storage unit 22 includes a white list 221 storing a communication network identifier indicating a communication network permitted to execute a message, and a white list 222A storing a communication unit identifier indicating a predetermined communication unit. The white list 221 includes contents shown in FIG.

  FIG. 8 is a diagram illustrating an example of the content of the white list 222A.

  The white list 222A includes, for example, a communication unit identifier indicating a communication unit of a communication terminal used in a reliable company. That is, regardless of whether or not the communication unit uses the permitted communication network, the communication unit identifier of the communication unit that is considered to be reliable from another viewpoint is included in the white list 222A. The white list 222A includes, for example, a communication unit identifier “1B” indicating the communication unit 1B.

  FIG. 9 is a flowchart illustrating the operation of the control unit 21 when a message is transmitted to the communication terminal 20.

  The determination unit 211 determines whether or not the communication network identifier indicating the communication network that has transmitted the message is in the white list 221 (S21).

  If it is determined that the communication network identifier indicating the communication network that has transmitted the message is in the white list 221 (S21: YES), the message processing unit 212 determines whether the message has a change identifier (S23). . If there is no change identifier in the message (S23: NO), the message processing unit 212 executes the message (S25) and ends the process.

  If it is determined that the communication network identifier indicating the communication network that has transmitted the message is not in the white list 221 (S21: NO), the message processing unit 212 determines whether the message has a change identifier (S27). . If there is no change identifier in the message (S27: NO), the message processing unit 212 discards the message (S29) and ends the process.

  If it is determined in step S23 or step S27 that the message has a change identifier, the message processing unit 212 determines whether the communication unit identifier in the message is in the white list 222A (S33).

  If the communication unit identifier in the message is not in the white list 222A (S33: NO), the message processing unit 212 discards the message (S29) and ends the process.

  If the communication unit identifier in the message is in the white list 222A (S33: YES), the message processing unit 212 determines whether the communication network identifier in the message is in the white list 221 (S35).

  If the communication network identifier in the message is in the white list 221 (S35: YES), the message processing unit 212 executes the message (S25) and ends the process.

  If the communication network identifier in the message is not in the white list 221 (S35: NO), the message processing unit 212 discards the message (S29) and ends the process.

(Operation in the second embodiment)
Next, the operation in the second embodiment will be described with reference to FIG. 7, FIG. 9, and FIG.

  FIG. 10 is a diagram illustrating a state in which a change identifier or the like is given to a message.

  Here, for example, the communication network B cannot be used due to a failure, and therefore, an operation of transmitting / receiving a message for the communication network B via the communication network A will be described.

  In FIG. 7, the message creation unit 11B creates a message for the communication network B and transmits the message to the identifier assigning unit 12B. The identifier assigning unit 12B assigns a change identifier or the like to the message. The communication unit 1B transmits a message with a change identifier or the like to the communication unit 1A.

  That is, as shown in FIG. 5, the message creation unit 11B creates a message including a header for the communication network B and a payload having a desired content. The identifier assigning unit 12B uses the header for the communication network B, the change identifier, the communication unit identifier “1B”, and the communication network identifier “B” as the header for the communication network A, and includes the header for the communication network A and the payload. Create a message. The communication unit 1B transmits a message to the communication unit 1A.

  Returning to FIG. 7, the communication unit 1A transmits the message transmitted from the communication unit 1B to the communication unit 2A via the communication network A.

  The communication unit 2A transmits the transmitted message to the control unit 21. According to the flowchart of FIG. 9, the determination unit 211 determines whether or not the communication network identifier indicating the communication network that has transmitted the message is in the white list 221 (S <b> 21). Since the whitelist 221 does not have the communication network identifier “A” indicating the communication network A (S21: NO), the message processing unit 212 determines whether the message has a change identifier (S27). Since the message processing unit 212 has a change identifier in the message (S27: YES), the message processing unit 212 determines whether the communication unit identifier in the message is in the white list 222A (S33). If the communication unit identifier “1B” in the message is in the white list 222A (S33: YES), the message processing unit 212 determines whether the communication network identifier in the message is in the white list 221 (S35). Since the communication network identifier “B” in the message is in the white list 221 (S35: YES), the message processing unit 212 executes the message (S25) and ends the process.

  If the communication unit identifier “1B” in the message is not in the white list 222A (S33: NO), the message processing unit 212 discards the message (S29) and ends the process.

  If the communication network identifier “B” in the message is not in the white list 221 (S35: NO), the message processing unit 212 discards the message (S29) and ends the process.

  The message processing unit 212 also has a communication network identifier “A” indicating the communication network A in the white list 221 (S21: YES), and if the message has a change identifier (S23: YES), the communication unit in the message It is determined whether the identifier is in the white list 222A (S33). The subsequent processing is the same as that described above.

  In addition, when the message generated by the message generation unit 11B is transmitted from the communication unit 1B to the communication unit 2B via the communication network B, the message processing unit 212 determines YES in S21 and NO in S23. The processing unit 212 executes a message (S25) and ends the process.

  In addition, when the message created by the message creation unit 11A is transmitted from the communication unit 1A to the communication unit 2A via the communication network A, the message processing unit 212 determines NO in S21 and NO in S23. Is discarded (S29), and the process ends.

(Modification in the second embodiment)
FIG. 11 is a configuration diagram of a communication system according to a modification example of the second embodiment.

  7 differs from the configuration of FIG. 7 in that the change identifier or the like is assigned by the communication terminal 10 in the communication system of FIG. 7, whereas the change identifier or the like is provided between the communication networks A and B in the communication system of FIG. It is given by the relay device 3.

  In FIG. 11, the message creation unit 11B creates a message for the communication network B. As illustrated in FIG. 10, the communication unit 1 </ b> B transmits a message including a header for the communication network B and a payload having a desired content to the relay device 3 via the communication network B. The identifier assigning unit 3A of the relay device 3 uses a header for the communication network B, a change identifier, a communication unit identifier “1B”, and a communication network identifier “B” as a header for the communication network A, and a message composed of this header and payload. Create The relay device 3 transmits a message to the communication unit 2A via the communication network A.

  Hereinafter, the processing in the communication terminal 20 is the same as that in the communication system of FIG.

  If it is known in advance in step S23 that it is determined that there is no change identifier in the message, the message may be executed immediately without performing step S23.

Further, when it is determined in step S27 that the change identifier is included in the message (S27: YES), if it is known in advance that the message is created by the communication unit 1B, for example, step S33 , S35 or the like may be performed immediately, and a message may be executed immediately. Alternatively, one of steps S33 and S35 may be executed.

  As described above, when a message is transmitted from any of the plurality of communication networks, the communication terminal 20 determines whether the communication network that transmitted the message is a predetermined communication network (S21). ) And the communication network that transmitted the message is determined to be a predetermined communication network (S21: YES), the means for executing the message (S25) and the communication network that transmitted the message are determined in advance. If it is determined that it is not a communication network (S21: NO), means for determining whether or not a change identifier indicating that the message is from a communication network that is not the original communication network is in the message (S27), and changes to a message If it is determined that there is no identifier (S27: NO), means for suppressing the execution of the message (S29) and the message If it is determined that there is a child (S27: YES), means (S35) for determining whether or not the original communication network indicated by the electronic message is a predetermined communication network, and the original communication network indicated by the electronic message If it is determined that the communication network is a predetermined communication network (S35: YES), it is determined that the means for executing a message (S25) and the original communication network indicated by the message is not a predetermined communication network. If it is done (S35: NO), since it is provided with means (S29) for suppressing the execution of the message, even if it is determined that the communication network that transmitted the message is not a predetermined communication network (S21: NO), a message can be executed.

  In addition, when a message is transmitted from any of the plurality of communication networks, the communication terminal 20 determines whether or not the communication network that has transmitted the message is a predetermined communication network (S21); If it is determined that the communication network that transmitted the message is a predetermined communication network (S21: YES), the means for executing the message (S25) and the communication network that transmitted the message are not a predetermined communication network. If it is determined (S21: NO), means (S27) for determining whether or not the message includes a change identifier indicating that the message is from a communication network that is not the original communication network, and the message includes the change identifier. If it is determined that there is no change (S27: NO), a means for suppressing the execution of the message (S29) and the change identifier in the message If it is determined (S27: YES), whether or not the communication unit identifier in the message indicating the communication unit that created the message before the change identifier is added to the message is a predetermined communication unit identifier. If it is determined that the communication unit identifier in the message is not a predetermined communication unit identifier (S33: NO), the unit (S29) for suppressing the execution of the message, If it is determined that the communication unit identifier is a predetermined communication unit identifier (S33: YES), means for determining whether or not the original communication network indicated by the electronic message is a predetermined communication network (S35) ) And the original communication network indicated by the message is determined to be a predetermined communication network (S35: YES), the message execution means (S25), If it is determined that the original communication network indicated by (2) is not a predetermined communication network (S35: NO), the communication network that has transmitted the message is determined in advance because it includes means (S29) for suppressing the execution of the message. Even if it is determined that the received communication network is not established (S21: NO), the electronic message can be executed.

  If it is determined that the communication network that transmitted the message is a predetermined communication network (S21: YES), the communication terminal 20 determines whether the change identifier is in the message (S23). If it is determined that the identifier is not in the electronic message (S23: NO), the electronic message is executed (S25). Confirmation that it is a network is obtained.

  In the second embodiment, the white list 221 storing the communication network identifier indicating the communication network permitted to execute the message is used. However, the communication network indicating the communication network not permitted to execute the message. A black list in which identifiers are stored may be used.

  In the second embodiment, the white list 222A is used, but a black list including a communication unit identifier that is not included in the white list 222A may be used.

  In addition, a computer program for causing a computer to function as each communication terminal or relay device according to each embodiment can be recorded on a computer-readable recording medium such as a semiconductor memory, a magnetic disk, an optical disk, a magneto-optical disk, or a magnetic tape. Further, it can be widely distributed by being transmitted through a communication network such as the Internet.

1, 2, 10, 20, 100, 200 ... communication terminals 1A, 1B, 2A, 2B ... communication unit 3 ... relay device 3A, 12B ... identifier assignment unit 11A, 11B ... message creation unit 21 ... control unit 22 ... storage unit 211: Determination unit 212 ... Message processing unit 221, 222A ... White list 222 ... Message processing method storage unit A, B ... Communication network

Claims (8)

A communication terminal capable of communicating via a plurality of communication networks,
Means for determining whether or not the communication network that has transmitted the message is a predetermined communication network if a message has been transmitted from any of the plurality of communication networks;
If it is determined that the communication network that transmitted the message is a predetermined communication network, means for executing the message;
If it is determined that the communication network that has transmitted the message is not a predetermined communication network, means for determining whether or not the message has a change identifier indicating that the message is from a communication network that is not the original communication network When,
Means for suppressing execution of the message if it is determined that the message does not have the change identifier;
A communication terminal comprising: means for executing the message when it is determined that the message has the change identifier. Means for determining whether the change identifier is in the message, if it is determined that the communication network that has transmitted the message is a predetermined communication network;
If it is determined that the communication network that has transmitted the electronic message is a predetermined communication network, and it is determined that the change identifier is in the electronic message, the electronic message is transmitted only when a predetermined condition is satisfied. The communication terminal according to claim 1, further comprising: A communication terminal capable of communicating via a plurality of communication networks,
Means for determining whether or not the communication network that has transmitted the message is a predetermined communication network if a message has been transmitted from any of the plurality of communication networks;
If it is determined that the communication network that transmitted the message is a predetermined communication network, means for executing the message;
If it is determined that the communication network that has transmitted the message is not a predetermined communication network, means for determining whether or not the message has a change identifier indicating that the message is from a communication network that is not the original communication network When,
Means for suppressing execution of the message if it is determined that the message does not have the change identifier;
Means for determining whether or not the original communication network indicated by the message is a predetermined communication network if it is determined that the change identifier exists in the message;
Means for executing the message if it is determined that the original communication network indicated by the message is a predetermined communication network;
A communication terminal comprising: means for suppressing execution of the electronic message if it is determined that the original communication network indicated by the electronic message is not a predetermined communication network. A communication terminal capable of communicating via a plurality of communication networks,
Means for determining whether or not the communication network that has transmitted the message is a predetermined communication network if a message has been transmitted from any of the plurality of communication networks;
If it is determined that the communication network that transmitted the message is a predetermined communication network, means for executing the message;
If it is determined that the communication network that has transmitted the message is not a predetermined communication network, means for determining whether or not the message has a change identifier indicating that the message is from a communication network that is not the original communication network When,
Means for suppressing execution of the message if it is determined that the message does not have the change identifier;
If it is determined that the message has the change identifier, the communication unit identifier in the message indicating the communication unit that created the message before the change identifier is given to the message is a predetermined communication unit identifier. Means for determining whether there is,
Means for suppressing execution of the message if it is determined that the communication unit identifier in the message is not a predetermined communication unit identifier;
Means for determining whether or not the original communication network indicated by the message is a predetermined communication network if it is determined that the communication unit identifier in the message is a predetermined communication unit identifier; ,
Means for executing the message if it is determined that the original communication network indicated by the message is a predetermined communication network;
A communication terminal comprising: means for suppressing execution of the electronic message if it is determined that the original communication network indicated by the electronic message is not a predetermined communication network. If it is determined that the communication network that transmitted the message is a predetermined communication network, the means for executing the message is:
5. The communication according to claim 1, wherein it is determined whether or not the change identifier is in the electronic message, and if it is determined that the change identifier is not in the electronic message, the electronic message is executed. Terminal. A message processing method for a communication terminal capable of communicating via a plurality of communication networks,
If the communication terminal transmits a message from any of the plurality of communication networks, determining whether or not the communication network that transmitted the message is a predetermined communication network;
If it is determined that the communication network that transmitted the message is a predetermined communication network, the step of executing the message;
If it is determined that the communication network from which the communication terminal has transmitted the message is not a predetermined communication network, whether or not the message has a change identifier indicating that the message is from a communication network that is not the original communication network Determining whether or not
If the communication terminal determines that the change identifier does not exist in the message, the step of suppressing execution of the message;
If the communication terminal determines that the change identifier exists in the message, the communication terminal executes a step necessary for executing or suppressing the message in the step of executing the message. Processing method. A message processing method for a communication terminal capable of communicating via a plurality of communication networks,
If the communication terminal transmits a message from any of the plurality of communication networks, determining whether or not the communication network that transmitted the message is a predetermined communication network;
If it is determined that the communication network that transmitted the message is a predetermined communication network, the step of executing the message;
If it is determined that the communication network from which the communication terminal has transmitted the message is not a predetermined communication network, whether or not the message has a change identifier indicating that the message is from a communication network that is not the original communication network Determining whether or not
If the communication terminal determines that the change identifier does not exist in the message, the step of suppressing execution of the message;
If it is determined that the communication terminal has the change identifier, the communication terminal determines whether or not the original communication network indicated by the message is a predetermined communication network;
If the communication terminal determines that the original communication network indicated by the message is a predetermined communication network, executing the message;
If the communication terminal determines that the original communication network indicated by the message is not a predetermined communication network, a step necessary for execution or suppression of the message in the step of suppressing execution of the message A message processing method for a communication terminal, comprising: A message processing method for a communication terminal capable of communicating via a plurality of communication networks,
If a message is transmitted from any of the plurality of communication networks, determining whether the communication network that has transmitted the message is a predetermined communication network;
If it is determined that the communication network that transmitted the message is a predetermined communication network, the step of executing the message;
If it is determined that the communication network that has transmitted the message is not a predetermined communication network, the step of determining whether or not the message has a change identifier indicating that the message is from a communication network that is not the original communication network When,
If it is determined that the change identifier does not exist in the message, the step of suppressing the execution of the message;
If it is determined that the message has the change identifier, the communication unit identifier in the message indicating the communication unit that created the message before the change identifier is given to the message is a predetermined communication unit identifier. Determining whether there is,
If it is determined that the communication unit identifier in the message is not a predetermined communication unit identifier, the step of suppressing the execution of the message,
If it is determined that the communication unit identifier in the message is a predetermined communication unit identifier, determining whether the original communication network indicated by the message is a predetermined communication network; ,
If it is determined that the original communication network indicated by the message is a predetermined communication network, executing the message;
If it is determined that the original communication network indicated by the message is not a predetermined communication network, executing the step necessary for execution or suppression of the message in the step of suppressing execution of the message A message processing method for a communication terminal.

Images