It should be noted that the present invention may record the exception type encoding through a status field of four bytes, where the value ranges from 0x1 to 0xFFFF (0x0 may be used to indicate normal), and the length field of the exception reply information is changed to 0, which indicates that there is no data area. The value of 0x1 to 0xFFFF can facilitate the custom expansion of illegal message under different abnormal conditions. Table 2 shows the content of the partial abnormal mapping coding information, the processing of the abnormal type code, and the corresponding meaning of the abnormal type code, and table 2 also briefly introduces the usage scenarios of different abnormal type codes, which is convenient for classifying and understanding the illegal message types.

The method of the invention further comprises a step 101:

step 101, logging the abnormal type code corresponding to the determined illegal message.

It should be noted that, in view of the connection between the processing procedure of the present invention and the filtering apparatus, the logging can be performed through the firewall log.

TABLE 2

The method of the invention avoids the problem caused by only discarding the illegal message by carrying out exception processing on the illegal message; furthermore, the abnormal reply information is sent, so that the corresponding message can be processed relatively, and the performance of the industrial automation network is improved; and a transmission control protocol _ reset connection (TCP _ RST) report is sent, so that the waste of network resources caused by repeated sending is avoided.

Fig. 2 is a flowchart of another method for implementing exception handling according to the present invention, as shown in fig. 2, including:

step 200, the request end determines the type of the illegal message according to the received abnormal reply information;

step 201, correcting the illegal message according to a preset repair instruction and the determined illegal message type, and retransmitting the corrected message.

In this step, the presetting of the repair instruction includes:

when the illegal message is a message with an invalid data handle, correcting the invalid session handle into an effective session handle;

It should be noted that, modifying an invalid session handle into a valid session handle may be performed by a person skilled in the art according to the difference between the invalid session handle and the valid session handle.

The method of the invention also comprises the following steps:

It should be noted that, since the modification process is performed at the request end, the operation log record may be added to the operation log at the request end.

Fig. 3 is a structural diagram of an apparatus for implementing exception handling according to the present invention, as shown in fig. 3, at least comprising a processing unit,

It should be noted that the device of the present invention can be disposed in the filtering device, or connected with the filtering device as an independent device, so as to implement connection with the processing of the industrial firewall; the specific arrangement does not require creative labor of those skilled in the art, and in addition, the device of the invention can be communicated with a request end to form a system for exception handling.

The processing unit is specifically configured to,

copying an Ethernet/IP message header of the illegal message, and adding the Ethernet/IP message header to a response Transmission Control Protocol (TCP) header of the abnormal reply message; determining the abnormal type code of the illegal message according to preset abnormal mapping coding information, and modifying the state field of a TCP (transmission control protocol) header of the response message into the determined abnormal type code; filling other parts of the abnormal reply message according to the response format of the industrial equipment; sending abnormal reply information to a request end for sending an illegal message; and/or the presence of a gas in the gas,

The device also comprises a log recording unit which is used for recording the log of the abnormal type code corresponding to the determined illegal message.

Fig. 4 is a structural diagram of a request end for implementing exception handling according to the present invention, as shown in fig. 4, including: a determining unit and a correction retransmitting unit; wherein,

The correction retransmission unit is also used for correcting the illegal message corresponding to the abnormal reply message through the received external instruction.

The request end of the invention also comprises an operation recording unit which is used for carrying out operation log recording on the corrected content of the illegal message.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for implementing exception handling, comprising:

respectively carrying out corresponding exception processing on each determined illegal message,

the performing exception handling comprises:

for each determined illegal message, respectively sending a transmission control protocol _ reset connection TCP _ RST message to a request end sending the illegal message so as to disconnect the request end,

the generating of the abnormal reply message specifically includes: for each of the illegal messages, the message is sent,

2. The method of claim 1, wherein the anomaly mapping coding information comprises:

3. The method according to claim 1 or 2, characterized in that the method further comprises:

4. A method for implementing exception handling, comprising:

correcting the illegal message according to a preset repair instruction and the determined illegal message type, and retransmitting the corrected message,

the preset repair instruction comprises:

5. The method of claim 4, further comprising:

6. The method according to claim 4 or 5, characterized in that the method further comprises:

7. An apparatus for implementing exception handling, comprising at least a processing unit,

a processing unit for respectively carrying out corresponding exception processing on each determined illegal message,

the processing unit is specifically configured to,

8. The apparatus according to claim 7, further comprising a logging unit configured to log the abnormal type code corresponding to the determined illegal message.

9. A request side for implementing exception handling, comprising: a determining unit and a correction retransmitting unit; wherein,

a correction retransmission unit for correcting the illegal message according to the preset repair instruction and the determined illegal message type and retransmitting the corrected message,

the preset repair instruction comprises:

10. The requesting end according to claim 9, wherein the correction resending unit is further configured to correct the illegal message corresponding to the abnormal reply message through a received external instruction.

11. The request end according to claim 9 or 10, characterized in that the request end further comprises an operation log unit, configured to log the operation on the corrected content of the illegal message.