CN101673218B - Method and system for acquiring Linux kernel information - Google Patents
Method and system for acquiring Linux kernel information Download PDFInfo
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- CN101673218B CN101673218B CN200910236010.4A CN200910236010A CN101673218B CN 101673218 B CN101673218 B CN 101673218B CN 200910236010 A CN200910236010 A CN 200910236010A CN 101673218 B CN101673218 B CN 101673218B
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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 the Telnet 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 receiving the 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 the Linux kernel information of the equipment can be realized, and the maintaining efficiency is improved.
Description
Technical field
The present invention relates to 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 free software, on the other hand due to its high efficiency and dirigibility, is subject to numerous equipment manufacturers' favor always, and at present, what in product development, use is more and more.
Consider from software security, linux kernel is divided into kernel state and user's state running software, kernel state and user's state are two kinds of runlevels of operating system, when running software is during 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 is in the time carrying out user's oneself code, claim it in user's state, now linux kernel moves in minimum (3 grades) personal code work of level of privilege.Like this, for some important abnormal informations, need to just can catch output at kernel state, as memory accessing outside (PAGE FAULT) etc.Linux kernel information is conventionally only exported and is shown on definite terminal device.As: use the machine of Linux, its linux kernel information can be shown on coupled display conventionally; Using on the equipment of built-in Linux, linux kernel information can output on serial equipment conventionally, by serial equipment, linux kernel information is outputed on local terminal and is shown, due to the distance limit of serial equipment, can only be used for this locality and check.
Linux kernel information can only show and check in this locality, the drawback causing is like this: when equipment is at the scene in operational process, when Linux goes wrong, maintainer will deal with problem, service equipment is stable, the equipment of just must arriving in carries out obtaining of linux kernel information at the scene, wastes time and energy, and brings 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 the linux kernel information realization Remote Acquisitioning 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, the method comprises:
The control desk structure (console) of linux kernel is carried out to initialization to the effective field of Telnet agreement, construct telnet console object, and registration Telnet terminal variable is set;
In the time that needs are checked linux kernel information, the Telnet terminal that will register is registered to telnet console object by registration Telnet terminal variable, and telnet console object is joined in kernel information output control equipment list (console_drivers);
By telnet console object, linux kernel information is exported to the Telnet terminal of registration, Telnet terminal receives linux kernel information.
In such scheme, describedly the effective field of Telnet agreement carried out to initialization be specially:
Be CON_ENABLED and CON_PRINTBUFFER to the flag field assignment in console; Be Telnet terminal output function to write field assignment.
In such scheme, the described Telnet terminal that will register is registered to telnet console object and is specially by registering Telnet terminal variable: what carry out according to user's state is log-in command, register Telnet terminal variable when empty detecting, at kernel state by the Telnet endpoint registration of current execution log-in command to telnet console object;
Further, in such scheme, the method also comprises: in the time existing sensing of registration Telnet terminal variable being detected, stop registration, return to registration failure information.
In such scheme, the described Telnet terminal of linux kernel information being exported to registration by telnet console object is specially: linux kernel state is utilized function printk (), console_drivers is traveled through, find telnet console object, call Telnet terminal output function, linux kernel information is exported to the Telnet terminal that is registered to telnet console object.
In such scheme, described method further comprises: nullify the Telnet terminal of registration by cancellation order, or when being connected extremely, disconnecting with the Telnet terminal of registration due to network reason, linux kernel state is nullified the Telnet terminal of registration automatically.
In such scheme, the described Telnet terminal by cancellation order cancellation registration is specially: nullify and order in the Telnet terminal input of registration, what linux kernel state was carried out according to user's state orders for nullifying, and calls the Telnet terminal of tty_release () function cancellation registration; Or,
In such scheme, described automatic cancellation is specially: linux kernel state detect be connected with Telnet terminal disconnect time, call tty_release () function nullify registration Telnet terminal.
A kind of system of obtaining linux kernel information that the present invention realizes, this system comprises:
Telnet terminal, for inputting log-in command and receiving linux kernel information;
Linux kernel, for console is carried out to initialization to the effective field of Telnet agreement, constructs telnet console object, and registration Telnet terminal variable is set; Also be registered to telnet console object for the Telnet terminal that will register at kernel state by registration Telnet terminal variable, and telnet console object is joined in the list of kernel information output control equipment; By telnet console object, linux kernel information is exported to the Telnet terminal of registration.
In such scheme, described Telnet terminal is further used for input and nullifies order;
In such scheme, described linux kernel is further used for according to the cancellation command code of user's state execution input cancellation order or detects being connected with Telnet terminal while disconnection, nullifies at kernel state;
In such scheme, described linux kernel is registered to telnet console object for the Telnet terminal that will register at kernel state by registration Telnet terminal variable, be log-in command specifically for what carry out according to user's state, register Telnet terminal variable when empty detecting, at kernel state by the Telnet endpoint registration of current execution log-in command to telnet console object; Be further used for, in the time existing sensing of registration Telnet terminal variable being detected, stopping registration, return to registration failure information.
In such scheme, described Telnet terminal comprises:
Log-in command module, inputs log-in command for maintainer;
Information receiving module, for receiving linux kernel information and registration failure information;
Nullify command module, input and nullify order for maintainer.
In such scheme, described linux kernel comprises:
Initialization module, for console is carried out to initialization to the effective field of Telnet agreement, constructs telnet console object, and registration Telnet terminal variable is set;
Registering modules, for carry out the log-in command code of log-in command according to user's state, register Telnet terminal variable when empty detecting, current Telnet endpoint registration, to telnet console object, and is joined telnet console object in console_drivers; Also, in the time existing sensing of registration Telnet terminal variable being detected, stop registration, return to registration failure information to Telnet terminal;
Message output module, for by finding telnet console object, calls Telnet terminal output function, linux kernel information is exported to the Telnet terminal of registration;
Nullify module, is connected when disconnection for what carry out according to user's state with Telnet terminal for nullifying order or detecting, nullify.
The invention provides a kind of method and system that obtains linux kernel information, by Telnet is carried out to initialization; In the time that needs are checked linux kernel information, be telnet console object by the current Telnet endpoint registration that will register, join in the list of information output console device; By telnet console object, linux kernel information is exported to the Telnet terminal of registration again; So, can realize the long-range linux kernel information to equipment by Telnet terminal and obtain, thereby can locate fast linux kernel problem, and not need personnel to arrive device context, improve maintenance efficiency; Particularly, when equipment is during in remote districts, scheme advantage provided by the invention is more obvious.
Brief description of the drawings
Fig. 1 is the schematic flow sheet that the present invention realizes the method for obtaining linux kernel information;
Fig. 2 is the structural representation that the present invention realizes the system of obtaining linux kernel information.
Embodiment
Basic thought of the present invention is: the console of linux kernel is carried out to initialization to the effective field of Telnet, construct telnet console object; In the time that needs are checked linux kernel information, the Telnet endpoint registration that will register is to telnet console object, and telnet console object is joined in console_drivers; Utilize function printk (), by telnet console object, linux kernel information is exported to the Telnet terminal of registration.
Wherein, described console_drivers is a queue, can add multiple different outlet terminal equipment in this queue, comprises the terminal device, the locally-attached terminal equipment etc. that use Telnet agreement to connect.
Below by drawings and the specific embodiments, the present invention is described in further detail again.
Telnet terminal is connected by Telnet agreement with linux kernel, and linux kernel is the Telnet terminal distribution memory address connecting, and the information of storage Telnet terminal, comprises the 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, the method comprises following step:
Step 101: the console of linux kernel is carried out to initialization to the effective field of Telnet agreement, construct telnet console object, and registration Telnet terminal variable is set;
Concrete, console_drivers, taking console as unit, therefore needs, for Telnet creates corresponding control desk object, to construct overall telnet console object with console.
In linux kernel, console has two to the effective field of Telnet agreement: flag and write.Wherein, flag field indicates the attribute of terminal device, and the output function that write field is console device, by carrying out flag and write field to the effective initialization of Telnet agreement, to construct 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 write field is Telnet terminal output function, and telnet console object is with regard to construction complete like this.
Meanwhile, overall situation registration Telnet terminal variable is set, is used in reference to being registered as the Telnet terminal of linux kernel information output in the memory address of linux kernel.
Step 102: in the time that needs are checked linux kernel information, in Telnet terminal, input log-in command, Linux user's state is carried out log-in command;
Concrete, when maintainer need to check linux kernel information in certain Telnet terminal, in Telnet terminal, input log-in command, Linux user's state is carried out log-in command, log-in command compiling is generated to executable program and moves in Telnet terminal; Wherein, in fact described log-in command is exactly the function ioctl () of Linux user's state, and function ioctl () enters command code in ginseng and is set to log-in command code, and other enters ginseng and is set to 0; Described log-in command code is macro definition, can be arbitrary string and macro definition value, as long as the log-in command code of log-in command that Linux user's state is carried out and the definition of the log-in command code of the command processing function tty_ioctl () of linux kernel state are consistent, and do not used by other program definition.
What step 103:Linux kernel state was carried out according to user's state is log-in command, and the Telnet endpoint registration that will register is to telnet console object, and telnet console object is joined in console_drivers;
Concrete, the command processing function tty_ioctl () of linux kernel state, be log-in command code according to the command code that enters to join of the function ioctl () of Linux user's state, the Telnet endpoint registration that will register is to telnet console object, and telnet console object is joined in console_drivers, that is: registration Telnet terminal variable is detected, register Telnet terminal variable when empty when detecting, the current Telnet of not having terminal registration detected, registration Telnet terminal variable is pointed to the Telnet terminal of current execution log-in command in the memory address of linux kernel, call kernel registration function register_console (), the Telnet endpoint registration of the memory address that kernel registration function register_console () points to registration Telnet terminal variable is to telnet console object, and telnet console object is joined in console_drivers, in the time existing sensing of registration Telnet terminal variable being detected, the current Telnet of having terminal registration detected, linux kernel state stops registration operation, returns to registration failure information.
Step 104:Linux kernel state utilizes function printk (), by telnet console object, linux kernel information is exported to the Telnet terminal of registration, and Telnet terminal receives linux kernel information;
Concrete, linux kernel state is utilized function printk (), console_drivers content is traveled through, find telnet console object, call Telnet terminal output function write, linux kernel information is exported to the Telnet terminal that is registered to telnet console object, Telnet terminal receives linux kernel information.
What step 105:Linux kernel state was carried out according to user's state is to nullify order or detect to be connected with the Telnet terminal of registering while disconnection, nullifies;
Concrete, the Telnet terminal that maintainer can register by cancellations order cancellation as required, or when being connected extremely, disconnecting with the Telnet terminal of registration due to network or other reason, linux kernel state is nullified the Telnet terminal of registration automatically; Wherein,
The described Telnet terminal device by cancellation order cancellation registration is specially: maintainer nullifies and orders in the Telnet terminal input of registration, Linux user's state is carried out and is nullified order, cancellation order compiling is generated to executable program and moves in the Telnet terminal of registration.
The function ioctl () that described cancellation order is in fact also Linux user's state, just different from the command code of log-in command, function ioctl () enters command code in ginseng and is set to nullify command code here, and other enters ginseng and is set to 0; Wherein, nullify command code the same with log-in command code, for macro definition, can be arbitrary string and macro definition value, as long as it is consistent Linux user's state to be carried out to the cancellation command code definition of the cancellation command code of cancellation order and the command processing function tty_ioctl () of linux kernel state, and do not used by other program definition.
The command processing function tty_ioctl () of linux kernel state, that carries out according to Linux user's state orders for nullifying, the command code that enters to join that is the function ioctl () of Linux user's state is to nullify command code, call function tty_release (), in this function, first registration Telnet terminal variable is set to sky, then call kernel and nullify function unregister_console (), nullify function unregister_console () by kernel the telnet console object adding in step 104 is deleted from console_drivers.
Described automatic cancellation Telnet terminal device is specially: linux kernel state detect be connected with Telnet terminal disconnect time, call function tty_release (), in this function, first registration Telnet terminal variable is set to sky, call function unregister_console () is deleted the telnet console object adding by function unregister_console () from console_drivers.
Based on said method, the present invention also provides a kind of system of obtaining linux kernel information, and as shown in Figure 2, this system comprises:
Telnet terminal 21, for inputting log-in command and receiving linux kernel information; In fact described log-in command is exactly the function ioctl () of Linux user's state, and function ioctl () enters command code in ginseng and is set to log-in command code, and other enters ginseng and is set to 0;
Linux kernel 22, for console is carried out to initialization to the effective field of Telnet agreement, constructs telnet console object; The log-in command of inputting according to Telnet terminal 21, carries out log-in command in Linux user's state; , the Telnet terminal 21 of current execution log-in command is registered to telnet console object, and telnet console object is joined in console_drivers according to log-in command code in linux kernel state; Utilize function printk (), by telnet console object, linux kernel information is exported to the Telnet terminal 21 of registration;
Further, described Telnet terminal 21 is also nullified order for inputting; The function ioctl () that described cancellation order is Linux user's state, function ioctl () enters command code in ginseng and is set to nullify command code, and other enters ginseng and is set to 0;
Described linux kernel 22 also, for according to nullifying command code or detect is connected disconnection during with Telnet terminal 21, is nullified, and the telnet console object 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, inputs log-in command for maintainer;
Information receiving module 212, for receiving linux kernel information and registration failure information;
Nullify command module 213, input and nullify order for maintainer;
Described linux kernel 22 comprises: initialization module 221, Registering modules 222, message output module 223, cancellation module 224;
Initialization module 221, for console is carried out to initialization to the effective field of Telnet agreement, constructs telnet console object, and registration Telnet terminal variable is set;
Registering modules 222, for the log-in command of inputting according to Telnet terminal 21, carries out log-in command in user's state; Kernel state is according to log-in command code, registration Telnet terminal variable is detected, register Telnet terminal variable when empty when detecting, the Telnet terminal 21 of current execution log-in command is registered to telnet console object, and telnet console object is joined in console_drivers; In the time existing sensing of registration Telnet terminal variable being detected, stop registration, return to registration failure information to Telnet terminal 21;
Message output module 223, for utilizing function printk (), travels through console_drivers, finds telnet console object, calls Telnet terminal output function, linux kernel information is outputed to the Telnet terminal 21 of registration.
Nullify module 224, for according to nullifying command code or detect is connected disconnection during with Telnet terminal 21, call function tty_release (), nullifies, and the telnet console object adding is deleted from console_drivers.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention, all any amendments of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a method of obtaining linux kernel information, is characterized in that, the method comprises:
The control desk structure of linux kernel is carried out to initialization to the effective field of Telnet agreement, construct telnet console object, and registration Telnet terminal variable is set;
In the time that needs are checked linux kernel information, the Telnet terminal that will register is registered to telnet console object by registration Telnet terminal variable, and telnet console object is joined in kernel information output control equipment list console_drivers;
Linux kernel state is utilized function printk (), console_drivers is traveled through, find telnet console object, call Telnet terminal output function, linux kernel information is exported to the Telnet terminal that is registered to telnet console object, 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 to initialization is specially:
Be CON_ENABLED and CON_PRINTBUFFER to the flag field assignment in control desk; Be Telnet terminal output function to write field assignment.
3. method according to claim 1, it is characterized in that, the described Telnet terminal that will register is registered to telnet console object and is specially by registering Telnet terminal variable: what carry out according to user's state is log-in command, register Telnet terminal variable when empty detecting, at kernel state by the Telnet endpoint registration of current execution log-in command to telnet console object;
Further, the method also comprises: in the time existing sensing of registration Telnet terminal variable being detected, stop registration, return to registration failure information.
4. according to the arbitrary described method of claims 1 to 3, it is characterized in that, described method further comprises: the Telnet terminal of nullifying registration by cancellation order, or when being connected extremely, disconnecting with the Telnet terminal of registration due to network reason, linux kernel state is nullified the Telnet terminal of registration automatically.
5. method according to claim 4, is characterized in that,
The described Telnet terminal by cancellation order cancellation registration is specially: nullify and order in the Telnet terminal input of registration, what linux kernel state was carried out according to user's state orders for nullifying, and calls the Telnet terminal of tty_release () function cancellation registration; Or,
Described automatic cancellation is specially: linux kernel state detect be connected with Telnet terminal disconnect time, call tty_release () function nullify registration Telnet terminal.
6. a system of obtaining linux kernel information, is characterized in that, this system comprises: Telnet terminal and linux kernel, wherein,
Telnet terminal, comprising: the unit of the unit of input log-in command and reception linux kernel information;
Linux kernel, for control desk is carried out to initialization to the effective field of Telnet agreement, constructs telnet console object, and registration Telnet terminal variable is set; Also be registered to telnet console object for the Telnet terminal that will register at kernel state by registration Telnet terminal variable, and telnet console object is joined in the list of kernel information output control equipment; Linux kernel state is utilized function printk (), console_drivers is traveled through, find telnet console object, call Telnet terminal output function, linux kernel information is exported to the Telnet terminal that is registered to telnet console object.
7. system according to claim 6, is characterized in that, described Telnet terminal is further used for input and nullifies order;
Described linux kernel is further used for according to the cancellation command code of user's state execution input cancellation order or detects being connected with Telnet terminal while disconnection, nullifies at kernel state;
Described linux kernel is registered to telnet console object for the Telnet terminal that will register at kernel state by registration Telnet terminal variable, be log-in command specifically for what carry out according to user's state, register Telnet terminal variable when empty detecting, at kernel state by the Telnet endpoint registration of current execution log-in command to telnet console object; Be further used for, in the time existing sensing of registration Telnet terminal variable being detected, stopping registration, return to registration failure information.
8. system according to claim 7, is characterized in that, described Telnet terminal comprises:
Log-in command module, inputs log-in command for maintainer;
Information receiving module, for receiving linux kernel information and registration failure information;
Nullify command module, input and nullify order for maintainer.
9. system according to claim 7, is characterized in that, described linux kernel comprises:
Initialization module, for control desk is carried out to initialization to the effective field of Telnet agreement, constructs telnet console object, and registration Telnet terminal variable is set;
Registering modules, for carry out the log-in command code of log-in command according to user's state, register Telnet terminal variable when empty detecting, current Telnet endpoint registration, to telnet console object, and is joined telnet console object in console_drivers; Also, in the time existing sensing of registration Telnet terminal variable being detected, stop registration, return to registration failure information to Telnet terminal;
Message output module, for by finding telnet console object, calls Telnet terminal output function, linux kernel information is exported to the Telnet terminal of registration;
Nullify module, is connected when disconnection for what carry out according to user's state with Telnet terminal for nullifying order or detecting, nullify.
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| CN101155043A (en) * | 2006-09-29 | 2008-04-02 | 上海博达数据通信有限公司 | Method for implementing terminal service program by telnet login mode |
| CN101221527A (en) * | 2007-01-08 | 2008-07-16 | 上海宇梦通信科技有限公司 | Physical memory information monitoring system of Linux platform |
| CN101216800A (en) * | 2008-01-02 | 2008-07-09 | 中兴通讯股份有限公司 | LINUX log controller and method |
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