CN1274119C - Method for dynamic modifying one-board IP address and sub-net mask address - Google Patents

Abstract

The invention relates to a method for dynamically modifying the IP address and subnet mask address of a single board. In order to change the modification of the IP address from a static modification method to a dynamic modification method, the PNA module supporting the Socket standard interface under the Psos operating system is used. Call the ioctl function to dynamically modify the IP address and subnet mask address of the board according to the following steps: define the system structure; clear the defined system structure; obtain the Socket identifier; assign the system structure; call ioctl The function modifies the parameters of the board; closes the Socket. Compared with the traditional method of statically modifying the IP address, the biggest advantage of dynamically modifying the IP address is that it does not need to restart the board, which can save the time spent on starting the board, prolong the life of the board, and make the modification of the IP address real-time It also reduces the impact of IP address modification on other modules.

Description

The method of dynamically modifying the IP address and subnet mask address of a single board

technical field

The invention relates to the field of network communication, and more specifically relates to a method for dynamically modifying the IP (Internet Protocol) address or subnet mask address of a single board.

Background technique

The modification of the IP address and subnet mask address by a general program is to assign the value to be modified to the global variable of the program, and then re-run the program. If the program is not re-run, when the terminal shows that the IP address and subnet mask address have been modified, the modification has not actually been completed. The simplest phenomenon is that you can continue to debug in the debugging environment, because when communicating with the board and debugging, the debugging environment of the host is related to the IP address of the board. If the IP address of the board changes, the connection between the host and the board The connection should also be disconnected, that is, the board can no longer be operated. If you can continue to debug in the debugging environment, it means that the IP address of the board has not changed. In addition, use the 'ping' command that comes with the Windows operating system to check the ping packet of the IP address, and you can see whether the connection has been interrupted.

It can be seen that although the IP address of the single board is modified in the prior art, the IP address needs to be restarted to use the IP address, so the modification of the IP address is actually a static modification, and the user often forgets to restart, resulting in the IP The address has not actually changed. In addition, if the user needs to modify the IP address multiple times, the above static modification method needs to be restarted every time, which greatly reduces the work efficiency.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for dynamically modifying the single board IP address and subnet mask address for the above-mentioned defects of the prior art, and change the modification of the IP address from a static modification method to a dynamic modification method, The IP address of the board can be modified without rebooting.

The technical solution adopted by the present invention to solve its technical problems is: a method for dynamically modifying the single-board IP address and subnet mask address, wherein, utilizing the network communication module supporting the Socket standard interface in the embedded operating system, by calling ioctl function to dynamically modify the IP address or subnet mask address of the board according to the following steps: define the system structure; clear the defined system structure; obtain the Socket identifier; assign a value to the system structure; call the ioctl function to modify The IP address or subnet mask address of the board; close the Socket.

In the method of the present invention, the embedded operating system may be Psos (real-time operating system), and the network communication module is a PNA (Psos network component) module in the Psos operating system.

In the method of the present invention, the ioctl function has three parameters, the parameters are the Socket identifier, the operation parameters and the pointer of the system interface structure.

In the method of the present invention, the operating parameter is 'SIOCSIFADDR' or 'SIOCSIFNETMASK'; if the operating parameter is 'SIOCSIFADDR', modify the single board IP address; if the operating parameter is 'SIOCSIFNETMASK', modify the The subnet mask address of the above board.

Compared with the traditional method of statically modifying the IP address, the biggest advantage of dynamically modifying the IP address is that it does not need to restart the board, which can save the time spent on starting the board, prolong the life of the board, and make the modification of the IP address real-time It also reduces the impact of IP address modification on other modules.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Figure 1 is a flow chart of the method of the present invention.

Detailed ways

In order to realize above-mentioned scheme, can adopt Psos operating system among the present invention, this is a kind of embedded operating system, is different from ordinary operating system, and it has been embedded in the single board, and software operation is based on this system; Embedded operating system is in Electronic automatic control, circuit design, it can be said that as long as the machine (usually a circuit board) embedded with a high-speed CPU is used, such as a PDA. The Psos operating system is divided into six main modules according to the functional structure, and each module is only aimed at its corresponding processing field, such as a computing unit for special calculation, and a debugging unit for debugging. The PNA module is specially used in the Psos operating system. A unit for network communication, including all components in Psos that support network communication. Regarding the Psos system structure, it refers to some structures combined with the service software for the system to run. It can be understood as a part of the Psos system, similar to the system files used in the Windows system. Correctly modifying this file can optimize the configuration of the system.

To modify IP address and subnet mask address dynamically, it is necessary to directly operate the hardware interface. In the present invention, the ioctl function is used to realize the dynamic modification of IP address and subnet mask address, and ioctl is an input in the Socket interface , the function of the output operation, it is a very powerful function. At the same time, the PNA module (that is, the TCP/IP protocol module) of the Psos operating system is used in the present invention to support the Socket interface standard, that is, to support the ioctl function. Regarding the Socket interface standard, the original meaning of Socket is the meaning of socket and interface. Simply understood, it is an intermediate layer between the bottom layer and the upper layer. When the software is merged, there is no need to debug any more. What is written in the present invention is exactly the upper layer part, and the bottom layer software has been completed according to the unified standard of Socket by the producer of Psos operating system. However, when using its interface, it is necessary to distinguish the functions of the Socket standard. At the same time, there may be multiple Sockets. In order to distinguish different situations, the Socket identifier must be used. It uses the standard Socket function (that is, the function of the same name as the socket) Acquisition, after acquisition, you must bring this identifier as a parameter every time you call the Socket function, and the system will know that it is operating on a certain Socket, not on other Sockets.

To realize the method of the present invention, it is necessary to utilize some system structures and bottom general Socket interface functions of the Psos operating system.

The flow process of the inventive method is as shown in Figure 1, and its process comprises:

(1) system structure is defined, use embedded operating system as the operating system of single board among the present invention, and operating system is actually the platform that a software runs, and it has a plurality of modules to support different functions separately, must have supporting network The part or module, the mode of network support and operation can be modified by the user, the system structure is a platform modified by the user, and the present invention achieves the purpose of modifying the network by modifying the parameters of the platform;

(2) Clear the defined system structure, that is, initialize the system structure to avoid other influences;

(3) Obtain the Socket identifier;

(4) assign a value to the system structure, that is, modify the corresponding system structure, and modify the attributes of the network structure of the embedded operating system;

(5) Call the ioctl function to modify the parameters of the single board;

(6) Then close the Socket and complete a modification action.

The key part of this method is 'calling the ioctl function to modify the parameters of the board'. Note that the system structure of the interface must have a corresponding assignment before this, otherwise it will not succeed. Then call the ioctl function to modify the parameters of the single board. The three parameters carried by the ioctl function are the Socket identifier, the operation parameter and the pointer of the system interface structure in turn. If the operation parameter is 'SIOCSIFADDR', the function of the entire function call is to directly modify the IP address; if the operation parameter is 'SIOCSIFNETMASK', the function of the entire function call is to directly modify the subnet mask address.

When using the system interface structure, the Psos system will not find that the parameters it needs have been changed, and will establish a TCP/IP connection according to the new parameters during communication, which is equivalent to dynamically modifying the IP address and subnet mask address.

It should be noted that the debugging tool uses the IP address to recognize the board, so after the IP address is changed, the debugging tool will think that the corresponding board does not exist, so the debugging tool will lose the connection. But the single board will use a new IP address when establishing a connection with the outside world. The usual static modification method is not the same. The system interface has not been modified, so the board still thinks that it is the original IP address, and it will only be modified when the system interface parameters are rewritten when the board is restarted.

In the present invention, the SIOCSIFADDR command word is used to modify the IP address, and the SIOCSIFNETMASK command word is used to modify the subnet mask address. The port is directly operated by calling the ioctl system function. When the function is called in the main program, the values of the input parameters BoardIP address and BoardSubIP address of the function will directly modify the IP address value and the subnet mask address value. Compared with the traditional method of statically modifying the IP address, the biggest advantage of dynamically modifying the IP address is that it does not need to restart the board, which can save the time spent on starting the board, prolong the life of the board, and make the modification of the IP address real-time It also reduces the impact of IP address modification on other modules.

Claims (4)

1, a kind of method that on-the-fly modifies veneer IP address and subnet mask address, it is characterized in that, utilize the network communication module of supporting the Socket standard interface in the embedded OS,, dynamically revise veneer IP address or subnet mask address according to the following steps by calling the ioctl function:

System configuration is defined;

To the system configuration zero clearing that has defined;

Obtain the Socket identifier;

System configuration is carried out assignment;

Call the ioctl function and revise the IP address or the subnet mask address of veneer;

Close Socket.

2, method according to claim 1 is characterized in that, described embedded OS is the Psos real time operating system, and described network communication module is the Psos network components PNA module in the Psos operating system.

3, method according to claim 2 is characterized in that, described ioctl function has three parameters, and described parameter is the pointer of described Socket identifier, operating parameter and described system interface structure.

4, method according to claim 3 is characterized in that, described operating parameter is ' SIOCSIFADDR ' or ' SIOCSIFNETMASK '; If operating parameter is ' SIOCSIFADDR ', then revise described veneer IP address; If operating parameter is ' SIOCSIFNETMASK ', then revise described veneer subnet mask address.

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