JPH09265428A - File transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely obtain a file requested from a file receiving terminal only by transferring remaining file data which can not be received yet to a transmitting terminal by using file data received before the interruption of file transfer. SOLUTION: The length of partial file data received by the receiving terminal 160 before the generation of a fault and check information calculated by a unidirectional function are transmitted to the transmitting terminal 110, which calculates the uni-directional function of the transmitted file data for the length and compares whether the calculated function coincides with the transmitted check information or not. Thereby the contents of the partial file data from the terminal 160 can be confirmed and the remaining file data which can not be received yet are transferred to the terminal 110 by using the file data received before the interruption of file transfer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file transfer system for transmitting / receiving a file via a network, and more particularly to a file transfer system in the case where the file transfer fails in the middle due to a network failure or a failure on the transmitting terminal side. The present invention relates to a technique effectively applied to a file transfer system for retrying.

[0002]

2. Description of the Related Art In a file transfer system for sending and receiving a file via a network, when the file transfer is being performed and a network failure or a failure occurs on the sending terminal side, the file transfer fails. In order to reduce network traffic, conventional retry of file transfer measures the length of file data received by the receiving terminal side until the file transfer is interrupted, and informs the transmitting terminal side of the length. Then, the remaining file data after that is received from the transmitting terminal.

[0003]

SUMMARY OF THE INVENTION As a result of studying the above prior art, the present inventor has found the following problems.

(1) It is not guaranteed that the file data received by the receiving terminal before the file transfer is interrupted is part of the file data requested to be transferred after the failure recovery. Even if only the data is sent, the file originally requested by the receiving terminal may not be obtained.

(2) In the case where a plurality of terminals hold the same transfer file data, when a failure occurs during file transfer with a certain sending terminal, other terminals do not wait for recovery from the failure and other Although it was possible to newly request all the transfer files from the sending terminal of, it cannot be guaranteed that the file data received so far is a part of the file data transferred from another transfer terminal. I couldn't get the rest of the file data to be transferred.

An object of the present invention is to use the file data received before the interruption of the file transfer, and to request the file receiving terminal side by simply transferring the remaining file data which could not be received to the transmitting terminal side. It is to provide a technique capable of surely obtaining a file.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0008]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

File transfer in which at least one receiving terminal having a file receiving means and a receiving file storage means and at least one transmitting terminal having a file transmission means and a transmission file storage means are connected via a network In the system, the file receiving means measures an input / output means for inputting a command from a user or inputting / outputting data to / from the file storage means, and a length of file data stored in the received file storage means. File length measuring means, a one-way function calculating means for calculating a one-way function for the file data stored in the received file storage means, and another one-way function for the file data stored in the received file storage means. Data connection means for connecting data and a file between the transmission terminal via the network. Communication control means for transmitting / receiving data and transmitting the calculation result of the one-way function to the file transmitting means, wherein the file transmitting means transmits / receives file data to / from the receiving terminal via the network. A communication control means for receiving the calculation result of the one-way function from the file receiving means, an input / output means for inputting / outputting data to / from the transmission file storage means, and an arbitrary one stored in the transmission file storage means Data selection means for selecting file data with data of arbitrary length, and one-way with respect to data stored in the transmission file storage means corresponding to the file name and length stored in the reception file storage means One-way function calculation means for calculating a function, calculation result of one-way function received from the file reception means, and the file transmission means And a comparing means for comparing the calculation result of the definitive one-way function.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below.

FIG. 1 shows the configuration of a file transfer system according to an embodiment of the present invention.

In the file transfer system of the present embodiment, as shown in FIG. 1, a transmission terminal 110 having a file transmission unit 120 and a reception terminal having a file reception unit 170 are connected by Ethernet, FDDI, token ring, AT.
Network 15 such as M, leased line, or ISDN
0 has a configuration connected to 0, and its sending / receiving terminal 11
Auxiliary storage devices 130 and 190 such as a hard disk, a floppy disk, an optical disk and a CD-ROM are connected to 0 and 160, respectively. Incidentally, reference numeral 140 shown in FIG. 1 denotes transfer file data to be transferred.

The file receiving section 170 shown in FIG.
As shown in (a), a communication control unit 171 that transmits / receives file data and a calculation result of a one-way function to / from a specific communication terminal via the network 150, command input from the input device 176, and auxiliary Input / output unit 172 for inputting / outputting data to / from storage device 190, file length measuring unit 174 for measuring length of arbitrary file data in auxiliary storage device 190, and inputting arbitrary file data in auxiliary storage device 190 The unidirectional function calculation unit 173 calculates a unidirectional function, and the data connection unit 175 connects new data to arbitrary file data in the auxiliary storage device 190.

As shown in FIG. 2B, the file transmission section 120 includes a communication control section 121 that transmits / receives file data to / from a specific communication terminal and receives the calculation result of the one-way function via the network 150. An input / output unit 122 for inputting / outputting data to / from the auxiliary storage device 130, and one for calculating the output of the one-way function by inputting data of an arbitrary length from the beginning of arbitrary file data in the auxiliary storage device 130 The directional function calculation unit 123 and the result calculated by the unidirectional function calculation unit 123 (hereinafter, check information 2, 4
In the auxiliary storage device 130, and an information comparison unit 124 that compares the result (hereinafter, referred to as check information 1 and 3) calculated by the one-way function calculation unit 173 of the file reception unit 170 described above. A data selection unit 1 for selecting data of arbitrary length from the beginning of arbitrary file data and data of arbitrary position to end of arbitrary file data
25 and.

The above-mentioned one-way function means that fixed-length output data is calculated for input data of an arbitrary length, and the same output data is calculated for the same input data.
It is a function with the characteristics that it is very difficult to infer the input data from the output data.

Next, in the above-mentioned file transfer system, an operation transition until the file transfer is interrupted due to a network failure or a failure on the transmitting terminal 110 side will be described with reference to FIG.

FIG. 3 shows a network failure or
7 is a flowchart showing a transition of a file transfer operation of the file transfer system until the file transfer is interrupted due to a failure of the transmission terminal 110.

In the file transfer of the file transfer system of the present embodiment, first, the file receiving section 170 causes the user to
Alternatively, the transmitting terminal 11 designated by another process
The identifier of the designated transfer file data 140 is transmitted to the file transmission unit 120 of 0 (step 210).

The file transmission unit 120 searches the transfer file data 140 on the auxiliary storage device 130 from the received file identifier, extracts the transfer file data 140 (step 220), and extracts the transfer file data 140 in units of data transfer between terminals. Divide into certain packets (step 23
0), transfer the divided packet to the transfer file data 14
The file receiving unit 170 is sequentially arranged from the portion corresponding to the beginning of 0.
(Step 240).

The file receiving section 170 writes the received packet in the auxiliary storage device 190 (step 25).
0), when a part of the packets is received by the file receiving unit 170, the network 150 between the transmitting terminal 110 and the receiving terminal 160 may be disconnected from a physical line, or may be routed in the middle of the network. A physical or logical failure occurs due to the control software going out of control, the file transmitting unit 120 abnormally terminating on the transmitting terminal 110 side, or the transmitting terminal 110 being powered off. Therefore, communication cannot be performed (step 260).

At this time, as shown in FIG. 4, the receiving terminal 16
The auxiliary storage device 190 on the 0 side stores the sending terminal 11 before the failure.
The partial file data 310 that is a part of the transfer file data 140 on the 0 side is held.

The procedure of the file transfer retry process of the file transfer system of this embodiment under such a situation will be described below with reference to FIGS.

FIG. 5 is a flow chart for explaining the retry processing of the file transfer of the file transfer system of the present embodiment after the failure described above is recovered.

In the file transfer retry processing of the file transfer system of this embodiment, first, the identifiers of the transmission terminal 110, the transfer file data 140, and the partial file data 310 are designated by the input unit 172 (step 410).

Then, the file receiving section 170 determines the partial file 3 which can be identified by the specified partial file identifier.
10 from the auxiliary storage device 190 (step 42
0), the length information of the partial file data 310 is measured by the file length measuring unit 174 (step 430).

Next, the file receiving unit 170 receives the check information 1 which is the calculation result of the one-way function when the partial file data 310 is input as the one-way function calculation unit 1.
Created by 73 (step 440), the file receiving unit 17
0 transmits the file identifier, length information, and check information 1 of the transfer file data 140 to the file transmission unit 120 of the transmission terminal 110 designated by the communication control unit 171 (step 450).

The file transmission unit 120 includes the auxiliary storage device 1
The transfer file data 140 corresponding to the file identifier received from 30 is taken out, and the data of the size indicated by the received length information is taken out from the beginning of the transfer file data 140 by the data selecting section 125 (step 46).
0), the one-way function calculation unit 123 creates check information 2 which is the calculation result of the one-way function when the data is input (step 470).

After that, the file transmission unit 120 compares the received check information 1 with the check information 2 calculated in step 470 by the information comparison unit 124. If the comparison result indicates that the data are the same, the process proceeds to step 490. If the data is different, the process proceeds to step 510 (step 480).

In step 490, the data selection unit 125 selects the file data excluding the data of the size indicated by the length information received from the beginning of the transfer file data 140, and the communication control unit 121 selects the file of the receiving terminal 160. It is transmitted to the receiving unit 170.

Then, the file receiving section 170 receives the file data of step 490 by the communication control section 171 and connects the data to the end of the partial file data 310 by the data linking section 175, which is the same as the transfer file data 140. Data is created (step 500).

In step 510, the file transmission unit 12
All the files with the identifier received by the communication control unit 121 of 0 are retransferred to the receiving unit 170.

File transfer in a file transfer system in which the same files are stored in the auxiliary storage device 130 and there are a plurality of transmission terminals 110 capable of transferring these files will be described.

FIG. 6 shows the configuration of a file transfer system including a plurality of transmission terminals 110a and 110b for transferring files.

In FIG. 6, 110a and 110b are provided with file transmission units 120a and 120b, respectively, and network 1
A transmitting terminal that connects to 50 to perform communication,
Reference numeral 130b denotes an auxiliary storage device having transfer file data 140 having the same content. The file transfer system includes a receiving terminal 160 having the plurality of transmitting terminals 110a and 110b, a file receiving unit 170 of a file transfer destination, and an auxiliary storage device 190. And are connected via a network 150.

The configuration of the file transmission units 120a and 120b is similar to that of the file transmission unit 120 shown in FIG.

Next, when the file is transferred from the transmitting terminal 110a, the file transfer is interrupted due to a failure of the transmitting terminal 110a and the partial file data is stored in the auxiliary storage device 190 of the receiving terminal 160 on the receiving side. Assuming that 310 is stored, a case will be described in which the remaining files are transferred from the transmission terminal 110b without waiting for the failure recovery of the transmission terminal 110a.

FIG. 7 is a flowchart showing a processing procedure for receiving a file transfer from another transmitting terminal which has not received the file transfer.

First, in the file receiving section 170, the input section 172 specifies the identifiers of the transmitting terminal 110b, the transfer file data 140, and the partial file data 310 (step 610), and the partial file that can be identified by the specified partial file identifier. 310 is the auxiliary storage device 1
90 (step 620), the length of the partial file data 310 is measured by the file length measuring unit 174 (step 630), and the calculation result of the one-way function when the partial file data 310 is input is checked. Information 3 is created by the one-way function calculation unit 173 (step 6
40), the file identifier of the transfer file data 140, the length information, and the check information 3 are transmitted to the designated transmission terminal 1
It is transmitted to the file transmission unit 120b of 10b (step 650).

The file transmission unit 120b takes out the transfer file data 140 corresponding to the file identifier received from the auxiliary storage device 130b (step 650), and selects the data of the size indicated by the received length information from the data selection unit 125. The transfer file data 140 is fetched from the beginning (step 660), and the one-way function calculator 123 creates check information 4, which is the calculation result of the one-way function when the data is input (step 670).
The check information 3 received from the transmitting terminal 110b is compared with the check information 4 calculated in step 670. If the comparison result shows that they are the same, the process proceeds to step 690, and if they are different, the process proceeds to step 710 (step 68).
0).

In step 690, the data selection unit 125
Then, the communication control unit 121 transmits the file data excluding the size data indicated by the length information received from the beginning of the transfer file data 140 to the file receiving unit 170 of the receiving terminal 160.

Then, the file receiving section 170 receives the file data of step 690, and the data connecting section 1
The data is connected to the end of the partial file data 310 by 75, and the same data as the transfer file data 140 is created (step 700).

In step 710, the file transmission unit 12
All the files with the identifier received by 0 are transferred to the file receiving unit 170.

Therefore, as described above, at least one receiving terminal having the file receiving means and the receiving file storing means, and at least one transmitting terminal having the file transmitting means and the transmitting file storing means are networked. In the file transfer system connected via the above, the file receiving means is stored in the received file storing means and the input / output means for inputting a command from a user or inputting / outputting data to / from the file storing means. File length measuring means for measuring the length of the file data, one-way function calculating means for calculating a one-way function with respect to the file data stored in the received file storage means, and the received file storage means Data connecting means for connecting other data to the stored file data, and the network And a communication control means for transmitting and receiving file data to and from the transmitting terminal via the network, and transmitting a calculation result of a one-way function, the file transmitting means comprising file data to and from the receiving terminal via the network. Communication control means for transmitting and receiving data, and receiving the calculation result of the one-way function, input and output means for inputting and outputting data to and from the transmission file storage means, and an arbitrary file stored in the transmission file storage means Data selection means for selecting data of arbitrary length, and one-way function for data stored in the transmission file storage means corresponding to the file name and length stored in the reception file storage means A unidirectional function calculating means for calculating the unidirectional function, a unidirectional function calculation result in the file receiving means, and a unidirectional function in the file transmitting means. By including a comparison means for comparing the calculation result of the, the receiving terminal transmits the length of the partial file data received before the failure and the check information calculated by the one-way function to the transmitting terminal, and the transmitting terminal side By calculating the one-way function of the transmitted file data for that length and comparing it with the transmitted check information, the contents of the partial file data of the receiving terminal can be confirmed, and the file transfer can be performed. The file requested by the file receiving terminal side can be surely obtained by using the file data received up to the time of interruption and only having the transmitting terminal side transfer the remaining file data that could not be received.

Further, since the contents of the partial file data of the receiving terminal can be confirmed, when there are a plurality of transmitting terminals, the remaining file transfer is performed to the transmitting terminal different from the transmitting terminal in which the failure has occurred. You can make a request and not have to wait for time for disaster recovery.

As described above, the invention made by the present inventor is
Although specifically described based on the embodiment, the present invention
It is needless to say that the present invention is not limited to the above embodiment, and various changes can be made without departing from the scope of the invention.

[0046]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

The file requested by the file receiving terminal side can be surely obtained only by having the transmitting terminal side transfer the remaining file data that could not be received.

[Brief description of drawings]

FIG. 1 shows a configuration of a file transfer system according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining configurations of a file transmission unit and a file reception unit.

FIG. 3 is a flowchart showing a transition of a file transfer operation of the file transfer system until the file transfer is interrupted due to a network failure or a transmission terminal failure.

FIG. 4 is a diagram showing a configuration of a file transfer system when a failure occurs.

FIG. 5 is a flowchart for explaining a file transfer retry process of the file transfer system according to the present embodiment.

FIG. 6 shows a configuration of a file transfer system including a plurality of transmission terminals for transferring files.

FIG. 7 is a flowchart showing a processing procedure for receiving a file transfer from another transmission terminal that has not received the file transfer.

[Explanation of symbols]

110 ... Sending terminal, 120 ... File sending unit, 121 ...
Communication control unit, 122 ... Input / output unit, 123, 173 ... One-way function calculation unit, 124 ... Information comparison unit, 125 ... Data selection unit, 130, 190 ... Auxiliary storage device, 140 ... Transfer data file, 150 ... Network , 160 ... Receiving terminal, 170 ... File receiving unit, 171 ... Communication control unit,
172 ... I / O unit, 174 ... File length measuring unit, 175
... data connection unit, 176 ... input device.

Claims (1)

[Claims] 1. At least one receiving terminal having a file receiving means and a receiving file storage means, and at least one transmitting terminal having a file transmission means and a transmission file storage means are connected via a network. In the file transfer system, the file receiving means is a command input from a user,
Alternatively, input / output means for inputting / outputting data to / from the file storage means, file length measuring means for measuring the length of file data stored in the received file storage means, and stored in the received file storage means One-way function calculation means for calculating a one-way function for file data, data connection means for connecting other data to the file data stored in the received file storage means, and the transmission via the network And communication control means for transmitting and receiving file data to and from the terminal, and transmitting the calculation result of the one-way function to the file transmitting means, wherein the file transmitting means is file data with the receiving terminal via the network. Communication control means for transmitting and receiving data, and receiving the calculation result of the one-way function from the file receiving means; Input / output means for inputting / outputting data to / from the file storage means, data selection means for selecting arbitrary file data stored in the transmission file storage means with data of arbitrary length, and the reception file storage means One-way function calculation means for calculating a one-way function for data stored in the transmission file storage means corresponding to the stored file name and length, and one-way function received from the file reception means And a comparison means for comparing the calculation result of 1) with the calculation result of the one-way function in the file transmission means.