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Modbus service processing method and device

A business processing and processor technology, applied in the network field, can solve problems such as business interruption, and achieve the effect of ensuring security and continuity

Active Publication Date: 2019-03-01
BEIJING QIANXIN TECH
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Problems solved by technology

The Modbus protocol has become the most commonly used industrial control collaboration protocol because of its simplicity, robustness, and development without any license authorization. Currently, most industrial firewalls support in-depth analysis of the Modbus protocol and access control based on the black and white lists of the Modbus protocol. In the interrupt mode, all illegal data packets are reset by sending reset packets, resulting in interruption of subsequent services, and the user needs to reconnect

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  • Modbus service processing method and device
  • Modbus service processing method and device

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0037] figure 1 A schematic flow diagram of a Modbus service processing method provided in this embodiment is shown, including:

[0038] S101. The firewall proxy establishes a connection with the server according to the connection request sent by the client, and receives the serial communication protocol Modbus request sent by the client.

[0039] Wherein, the firewall proxy is a proxy device set between the firewall and the client, located on the side of the firewall, and processes requests and data sent by the client to the firewall.

[0040] S102. If it is determined that the Modbus request is an illegal request, add a timer, and judge according to the timer whet...

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Abstract

The embodiment of the invention discloses a Modbus service processing method and device. The method comprises the following steps: building, by a firewall proxy, connection with the server according to a connection request sent by a client, and receiving a serial communication protocol Modbus request sent by the client; if the Modbus request is judged as an illegal request, adding a timer, and judging whether a session data packet corresponding to the Modbus request sent by the client is received or not according to the timer; if the session data packet corresponding to the Modbus request is received, abandoning the session data packet. According to the method disclosed by the embodiment of the invention, the firewall proxy receives the serial communication protocol Modbus request sent bythe client; when the Modbus request is judged to be the illegal request, the timer is added for judgment; if the session data packet corresponding to the Modbus request is received, the session data packet is abandoned; therefore, interruption of subsequent services cannot be caused; a user does not need to reconnect the server; and the security is guaranteed, and the continuity of a Modbus service is also guaranteed.

Description

technical field [0001] The embodiment of the present invention relates to the field of network technologies, and in particular to a Modbus service processing method and device. Background technique [0002] Modicon designed the serial communication protocol Modbus used in programmable logic controllers (PLCs) in the late 1970s. The Modbus protocol has become the most commonly used industrial control collaboration protocol because of its simplicity, robustness, and development without any license authorization. Currently, most industrial firewalls support in-depth analysis of the Modbus protocol and access control based on the black and white lists of the Modbus protocol. In the interrupt mode, all illegal data packets are reset by sending a reset packet, resulting in interruption of subsequent services, and the user needs to reconnect. Contents of the invention [0003] Since the above-mentioned problems exist in the existing method, the embodiment of the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L1/16H04L12/40
CPCH04L1/1607H04L63/0281H04L2012/40228
Inventor 白岩
Owner BEIJING QIANXIN TECH
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