CN101673218A - Method and system for acquiring Linux kernel information - Google Patents
Method and system for acquiring Linux kernel information Download PDFInfo
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- CN101673218A CN101673218A CN200910236010A CN200910236010A CN101673218A CN 101673218 A CN101673218 A CN 101673218A CN 200910236010 A CN200910236010 A CN 200910236010A CN 200910236010 A CN200910236010 A CN 200910236010A CN 101673218 A CN101673218 A CN 101673218A
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Abstract
The invention discloses a method for acquiring Linux kernel information. The method comprises the following steps: carrying out initialization on valid fields of a Telnet protocol by a Linux kernel console structure; when needing to check the Linux kernel information, registering a Telnet terminal to be registered to a Telnet console object by registering Telnet terminal variables, and adding theTelnet console object into a kernel information output control equipment list; and outputting the Linux kernel information to the registered Telnet terminal by the Telnet console object, and receivingthe Linux kernel information by the Telnet terminal. The invention discloses a system for acquiring Linux kernel information simultaneously; and according to the method, the remote acquisition of theLinux kernel information of the equipment can be realized, and the maintaining efficiency is improved.
Description
Technical field
The present invention relates to the linux kernel technology, relate in particular to a kind of method and system that obtains linux kernel information.
Background technology
Linux is the operating system of a kind of free use and open source code, on the one hand because it is a free software, on the other hand because its high efficiency and dirigibility, is subjected to the favor of vast equipment producer always, and at present, that uses in product development is more and more.
Consider from software security, linux kernel is divided into kernel state and user's attitude to running software, kernel state and user's attitude are two kinds of operation ranks of operating system, when running software is in kernel state, the kernel code of carrying out can use the kernel stack of current software process, and linux kernel moves in the highest (0 grade) kernel code of level of privilege; When running software when carrying out user's oneself code, then claim it to be in user's attitude, linux kernel moves in minimum (3 grades) personal code work of level of privilege at this moment.Like this,, need just can catch output, as memory accessing outside (PAGE FAULT) etc. at kernel state for some important abnormal informations.Linux kernel information is only exported on the terminal device of determining usually and is shown.As: use the machine of Linux, its linux kernel information can be shown on the coupled display usually; On the equipment that uses built-in Linux, linux kernel information can output on the serial equipment usually, by serial equipment linux kernel information is outputed on the local terminal to show, because the distance limit of serial equipment can only be used for this locality and check.
Linux kernel information can only show in this locality checks, a drawback that causes like this is: when equipment at the scene in the operational process, when Linux goes wrong, the maintainer will deal with problem, service equipment is stable, just must arrive in equipment carry out obtaining of linux kernel information at the scene, waste time and energy, bring very big inconvenience to plant maintenance.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of method and system that obtains linux kernel information, to long-range the obtaining of linux kernel information realization of equipment.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of obtaining linux kernel information that the present invention realizes, this method comprises:
The control desk structure (console) of linux kernel is carried out initialization to the effective field of Telnet agreement, construct the telnet console object, and registration Telnet terminal variable is set;
When needs are checked linux kernel information, the Telnet terminal that will register is registered to the telnet console object by registration Telnet terminal variable, and the telnet console object is joined in the kernel information output control equipment tabulation (console_drivers);
By the telnet console object, linux kernel information is exported to the Telnet terminal of registration, the Telnet terminal receives linux kernel information.
In the such scheme, describedly the effective field of Telnet agreement carried out initialization be specially:
To the flag field assignment among the console is CON_ENABLED and CON_PRINTBUFFER; To write field assignment is Telnet terminal output function.
In the such scheme, the described Telnet terminal that will register is registered to the telnet console object by registration Telnet terminal variable and is specially: according to the log-in command that is of user's attitude execution, detecting registration Telnet terminal variable when empty, at kernel state with the Telnet endpoint registration of current execution log-in command to the telnet console object;
Further, in the such scheme, this method also comprises: when detecting existing sensing of registration Telnet terminal variable, then stop registration, return registration failure information.
In the such scheme, the described Telnet terminal of linux kernel information being exported to registration by the telnet console object is specially: the linux kernel attitude is utilized function printk (), console_drivers is traveled through, find the telnet console object, call Telnet terminal output function, linux kernel information is exported to the Telnet terminal that is registered to the telnet console object.
In the such scheme, described method further comprises: nullify the Telnet terminal of registration by nullifying order, perhaps owing to the network reason be connected unusually with the Telnet terminal of registration, when disconnecting, the linux kernel attitude is nullified the Telnet terminal of registration automatically.
In the such scheme, described Telnet terminal by cancellation order cancellation registration is specially: nullify the Telnet terminal input of registration and order, the linux kernel attitude is called the Telnet terminal that tty_release () function is nullified registration according to ordering for nullifying that user's attitude is carried out; Perhaps,
In the such scheme, described automatic cancellation is specially: detect in the linux kernel attitude and be connected with the Telnet terminal when disconnecting, call the Telnet terminal that tty_release () function is nullified registration.
A kind of system that obtains linux kernel information that the present invention realizes, this system comprises:
The Telnet terminal is used to import log-in command and receives linux kernel information;
Linux kernel is used for console is carried out initialization to the effective field of Telnet agreement, constructs the telnet console object, and registration Telnet terminal variable is set; The Telnet terminal that also is used for will registering at kernel state is registered to the telnet console object by registration Telnet terminal variable, and the telnet console object is joined in the tabulation of kernel information output control equipment; Linux kernel information is exported to the Telnet terminal of registration by the telnet console object.
In the such scheme, described Telnet terminal is further used for input and nullifies order;
In the such scheme, described linux kernel is further used for the cancellation command code of ordering according to user's attitude execution input cancellation or detects with the Telnet terminal being connected when disconnecting, and nullifies at kernel state;
In the such scheme, the Telnet terminal that described linux kernel is used for will registering at kernel state is registered to the telnet console object by registration Telnet terminal variable, specifically be used for the log-in command that is according to the execution of user's attitude, detecting registration Telnet terminal variable when empty, at kernel state with the Telnet endpoint registration of current execution log-in command to the telnet console object; Be further used for when detecting existing sensing of registration Telnet terminal variable, then stopping registration, return registration failure information.
In the such scheme, described Telnet terminal comprises:
The log-in command module is used for the maintainer and imports log-in command;
Information receiving module is used to receive linux kernel information and registration failure information;
Nullify command module, be used for the maintainer and import the cancellation order.
In the such scheme, described linux kernel comprises:
Initialization module is used for console is carried out initialization to the effective field of Telnet agreement, constructs the telnet console object, and registration Telnet terminal variable is set;
Registering modules, be used for carrying out the log-in command sign indicating number of log-in command according to user's attitude, detecting registration Telnet terminal variable when empty, current Telnet endpoint registration to the telnet console object, and is being joined the telnet console object among the console_drivers; Also be used for when detecting existing sensing of registration Telnet terminal variable, then stopping registration, return registration failure information and give the Telnet terminal;
Message output module is used for calling Telnet terminal output function by finding the telnet console object, linux kernel information is exported to the Telnet terminal of registration;
Nullify module, be used for according to user's attitude carry out for nullifying order or detecting when being connected disconnection with the Telnet terminal, nullify.
The invention provides a kind of method and system that obtains linux kernel information, by Telnet is carried out initialization; When needs are checked linux kernel information, be the telnet console object with the current Telnet endpoint registration that will register, join in the tabulation of information output console device; By the telnet console object, linux kernel information is exported to the Telnet terminal of registration again; So, can obtain by the long-range linux kernel information of Telnet terminal realization, thereby can locate fast, and not need personnel to arrive device context, improve maintenance efficiency the linux kernel problem to equipment; Particularly when equipment during in remote districts, scheme advantage provided by the invention is more obvious.
Description of drawings
Fig. 1 obtains the schematic flow sheet of the method for linux kernel information for the present invention's realization;
Fig. 2 obtains the structural representation of the system of linux kernel information for the present invention's realization.
Embodiment
Basic thought of the present invention is: the console of linux kernel is carried out initialization to the effective field of Telnet, construct the telnet console object; When needs were checked linux kernel information, the Telnet endpoint registration that will register was to the telnet console object, and the telnet console object is joined among the console_drivers; Utilize function printk (),, linux kernel information is exported to the Telnet terminal of registration by the telnet console object.
Wherein, described console_drivers is a formation, can add a plurality of different outlet terminal equipment in this formation, comprises the terminal device that uses the Telnet agreement to connect, locally-attached terminal equipment etc.
Below by drawings and the specific embodiments the present invention is described in further detail again.
The Telnet terminal is connected by the Telnet agreement with linux kernel, the Telnet terminal distribution memory address of linux kernel for connecting, and storage Telnet terminal information comprises information such as port numbers, IP address; The present invention realizes a kind of method of obtaining linux kernel information, and as shown in Figure 1, this method comprises following step:
Step 101: the console of linux kernel is carried out initialization to the effective field of Telnet agreement, construct the telnet console object, and registration Telnet terminal variable is set;
Concrete, console_drivers is the unit with console, therefore need promptly construct overall telnet console object with console for Telnet creates control corresponding platform object.
Console has two to the effective field of Telnet agreement in the linux kernel: flag and write.Wherein, the flag field indicates the attribute of terminal device, and the write field is the output function of console device, by flag and write field are carried out the effective initialization of Telnet agreement is constructed overall telnet console object; General, be CON_ENABLED and CON_PRINTBUFFER to the assignment that is initialized as of flag field; Wherein, CON_ENABLED represents that terminal device enables, and CON_PRINTBUFFER represents to use buffer zone; The assignment that is initialized as to the write field is a Telnet terminal output function, and the telnet console object is just constructed and finished like this.
Simultaneously, overall situation registration Telnet terminal variable is set, is used in reference to the memory address of the Telnet terminal that will be registered as the output of linux kernel information at linux kernel.
Step 102: when needs are checked linux kernel information, in the Telnet terminal, the input log-in command, Linux user's attitude is carried out log-in command;
Concrete, when the maintainer need check on certain Telnet terminal linux kernel information, import log-in command on the Telnet terminal, Linux user's attitude is carried out log-in command, promptly the log-in command compiling is generated executable program and moves on the Telnet terminal; Wherein, in fact described log-in command is exactly the function ioctl () of Linux user's attitude, and command code was set to the log-in command sign indicating number during function ioctl () went into to join, and other is gone into ginseng and is set to 0; Described log-in command sign indicating number is a macro definition, can be arbitrary string and macro definition value, as long as the log-in command sign indicating number definition of the log-in command sign indicating number of the log-in command that Linux user's attitude is carried out and the command processing function tty_ioctl () of linux kernel attitude is consistent, and is got final product by other programs definition uses.
What step 103:Linux kernel state was carried out according to user's attitude is log-in command, and the Telnet endpoint registration that will register is to the telnet console object, and the telnet console object is joined among the console_drivers;
Concrete, the command processing function tty_ioctl () of linux kernel attitude, the command code of going into to join according to the function ioctl () of Linux user's attitude is the log-in command sign indicating number, the Telnet endpoint registration that will register is to the telnet console object, and the telnet console object joined among the console_drivers, that is: registration Telnet terminal variable is detected, when detecting registration Telnet terminal variable for sky, promptly detect the current Telnet of not having terminal registration, then will register Telnet terminal variable and point to the memory address of the Telnet terminal of current execution log-in command at linux kernel, call kernel registration function register_console (), kernel registration function register_console () will register the Telnet endpoint registration of the memory address that Telnet terminal variable points to the telnet console object, and the telnet console object is joined among the console_drivers; When detecting existing sensing of registration Telnet terminal variable, promptly detect the current Telnet of having terminal registration, then the linux kernel attitude stops the registration operation, returns registration failure information.
Step 104:Linux kernel state utilizes function printk (), by the telnet console object linux kernel information is exported to the Telnet terminal of registration, and the Telnet terminal receives linux kernel information;
Concrete, the linux kernel attitude is utilized function printk (), the console_drivers content is traveled through, find the telnet console object, call Telnet terminal output function write, linux kernel information is exported to the Telnet terminal that is registered to the telnet console object, and the Telnet terminal receives linux kernel information.
Step 105:Linux kernel state according to user's attitude carry out for nullifying order or detecting when being connected disconnection with the Telnet terminal of registering, nullify;
Concrete, the maintainer can nullify the Telnet terminal of registration by nullifying order as required, perhaps owing to network or other reason is connected unusually with the Telnet terminal of registration, when disconnecting, the linux kernel attitude is nullified the Telnet terminal of registration automatically; Wherein,
Described Telnet terminal device by cancellation order cancellation registration is specially: the maintainer nullifies the Telnet terminal input of registration and orders, Linux user's attitude is carried out and is nullified order, promptly cancellation order compiling is generated executable program and moves on the Telnet terminal of registration.
The function ioctl () that described cancellation order in fact also is Linux user's attitude, just different with the command code of log-in command, command code was set to nullify command code during function ioctl () went into to join here, and other is gone into ginseng and is set to 0; Wherein, it is the same with the log-in command sign indicating number to nullify command code, be macro definition, can be arbitrary string and macro definition value, as long as it is consistent Linux user's attitude carry out to be nullified the cancellation command code definition of command processing function tty_ioctl () of the cancellation command code of order and linux kernel attitude, and is got final product by other programs definition uses.
The command processing function tty_ioctl () of linux kernel attitude, according to ordering that Linux user's attitude is carried out for nullifying, the command code of going into to join that is the function ioctl () of Linux user's attitude is the cancellation command code, call function tty_release (), in this function, earlier registration Telnet terminal variable is changed to sky, call kernel then and nullify function unregister_console (), nullify function unregister_console () by kernel the telnet console object that adds in the step 104 is deleted from console_drivers.
Described automatic cancellation Telnet terminal device is specially: detect in the linux kernel attitude and be connected with the Telnet terminal when disconnecting, call function tty_release (), in this function, earlier registration Telnet terminal variable is changed to sky, call function unregister_console () is deleted the telnet console object that adds by function unregister_console () from console_drivers.
Based on said method, the present invention also provides a kind of system that obtains linux kernel information, and as shown in Figure 2, this system comprises:
Telnet terminal 21 is used to import log-in command and receives linux kernel information; In fact described log-in command is exactly the function ioctl () of Linux user's attitude, and command code was set to the log-in command sign indicating number during function ioctl () went into to join, and other is gone into ginseng and is set to 0;
Linux kernel 22 is used for console is carried out initialization to the effective field of Telnet agreement, constructs the telnet console object; According to the log-in command of Telnet terminal 21 inputs, carry out log-in command in Linux user's attitude; , the Telnet terminal 21 of current execution log-in command is registered to the telnet console object, and the telnet console object is joined among the console_drivers according to the log-in command sign indicating number in the linux kernel attitude; Utilize function printk (), linux kernel information is exported to the Telnet terminal 21 of registration by the telnet console object;
Further, described Telnet terminal 21 also is used for input cancellation order; The function ioctl () that described cancellation order is Linux user's attitude, command code was set to nullify command code during function ioctl () went into to join, and other is gone into ginseng and is set to 0;
Described linux kernel 22 also is used for being connected with Telnet terminal 21 when disconnecting according to nullifying command code or detecting, and nullifies, and promptly the telnet console object of adding is deleted from console_drivers.
Wherein, described Telnet terminal 21 comprises: log-in command module 211, information receiving module 212, cancellation command module 213;
Log-in command module 211 is used for the maintainer and imports log-in command;
Information receiving module 212 is used to receive linux kernel information and registration failure information;
Nullify command module 213, be used for the maintainer and import the cancellation order;
Described linux kernel 22 comprises: initialization module 221, Registering modules 222, message output module 223, cancellation module 224;
Registering modules 222 is used for the log-in command according to 21 inputs of Telnet terminal, carries out log-in command in user's attitude; Kernel state is according to the log-in command sign indicating number, registration Telnet terminal variable is detected, when detecting registration Telnet terminal variable for sky, the Telnet terminal 21 of current execution log-in command is registered to the telnet console object, and the telnet console object is joined among the console_drivers; When detecting existing sensing of registration Telnet terminal variable, then stop registration, return registration failure information and give Telnet terminal 21;
Nullify module 224, be used for being connected with Telnet terminal 21 when disconnecting according to nullifying command code or detecting, call function tty_release () nullifies, and promptly the telnet console object of adding is deleted from console_drivers.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of method of obtaining linux kernel information is characterized in that, this method comprises:
The control desk structure (console) of linux kernel is carried out initialization to the effective field of Telnet agreement, construct the telnet console object, and registration Telnet terminal variable is set;
When needs are checked linux kernel information, the Telnet terminal that will register is registered to the telnet console object by registration Telnet terminal variable, and the telnet console object is joined in the kernel information output control equipment tabulation (console_drivers);
By the telnet console object, linux kernel information is exported to the Telnet terminal of registration, the Telnet terminal receives linux kernel information.
2, method according to claim 1 is characterized in that, describedly the effective field of Telnet agreement is carried out initialization is specially:
To the flag field assignment among the console is CON_ENABLED and CON_PRINTBUFFER; To write field assignment is Telnet terminal output function.
3, method according to claim 1, it is characterized in that, the described Telnet terminal that will register is registered to the telnet console object by registration Telnet terminal variable and is specially: according to the log-in command that is of user's attitude execution, detecting registration Telnet terminal variable when empty, at kernel state with the Telnet endpoint registration of current execution log-in command to the telnet console object;
Further, this method also comprises: when detecting existing sensing of registration Telnet terminal variable, then stop registration, return registration failure information.
4, method according to claim 1, it is characterized in that, the described Telnet terminal of linux kernel information being exported to registration by the telnet console object is specially: the linux kernel attitude is utilized function printk (), console_drivers is traveled through, find the telnet console object, call Telnet terminal output function, linux kernel information is exported to the Telnet terminal that is registered to the telnet console object.
5, according to the arbitrary described method of claim 1 to 4, it is characterized in that, described method further comprises: nullify the Telnet terminal of registration by nullifying order, perhaps owing to the network reason be connected unusually with the Telnet terminal of registration, when disconnecting, the linux kernel attitude is nullified the Telnet terminal of registration automatically.
6, method according to claim 5 is characterized in that,
The described Telnet terminal of registering by cancellation order cancellation is specially: nullify the Telnet terminal of registering input and order, the linux kernel attitude is the cancellation order according to the execution of user's attitude, calls the Telnet terminal that the cancellation of tty_release () function is registered; Perhaps,
Described automatic cancellation is specially: detect in the linux kernel attitude and be connected with the Telnet terminal when disconnecting, call the Telnet terminal that tty_release () function is nullified registration.
7, a kind of system that obtains linux kernel information is characterized in that, this system comprises:
The Telnet terminal is used to import log-in command and receives linux kernel information;
Linux kernel is used for console is carried out initialization to the effective field of Telnet agreement, constructs the telnet console object, and registration Telnet terminal variable is set; The Telnet terminal that also is used for will registering at kernel state is registered to the telnet console object by registration Telnet terminal variable, and the telnet console object is joined in the tabulation of kernel information output control equipment; Linux kernel information is exported to the Telnet terminal of registration by the telnet console object.
8, system according to claim 7 is characterized in that, described Telnet terminal is further used for input and nullifies order;
Described linux kernel is further used for the cancellation command code of ordering according to user's attitude execution input cancellation or detects with the Telnet terminal being connected when disconnecting, and nullifies at kernel state;
The Telnet terminal that described linux kernel is used for will registering at kernel state is registered to the telnet console object by registration Telnet terminal variable, specifically be used for the log-in command that is according to the execution of user's attitude, detecting registration Telnet terminal variable when empty, at kernel state with the Telnet endpoint registration of current execution log-in command to the telnet console object; Be further used for when detecting existing sensing of registration Telnet terminal variable, then stopping registration, return registration failure information.
9, system according to claim 8 is characterized in that, described Telnet terminal comprises:
The log-in command module is used for the maintainer and imports log-in command;
Information receiving module is used to receive linux kernel information and registration failure information;
Nullify command module, be used for the maintainer and import the cancellation order.
10, system according to claim 8 is characterized in that, described linux kernel comprises:
Initialization module is used for console is carried out initialization to the effective field of Telnet agreement, constructs the telnet console object, and registration Telnet terminal variable is set;
Registering modules, be used for carrying out the log-in command sign indicating number of log-in command according to user's attitude, detecting registration Telnet terminal variable when empty, current Telnet endpoint registration to the telnet console object, and is being joined the telnet console object among the console_drivers; Also be used for when detecting existing sensing of registration Telnet terminal variable, then stopping registration, return registration failure information and give the Telnet terminal;
Message output module is used for calling Telnet terminal output function by finding the telnet console object, linux kernel information is exported to the Telnet terminal of registration;
Nullify module, be used for according to user's attitude carry out for nullifying order or detecting when being connected disconnection with the Telnet terminal, nullify.
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| CN111045977A (en) * | 2019-12-18 | 2020-04-21 | 深圳先进技术研究院 | USB serial port implementation method of Linux system console and related product |
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