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libvirt/src/conf/virchrdev.h

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util: Add helpers for safe domain console operations This patch adds a set of functions used in creating console streams for domains using PTYs and ensures mutually exclusive access to the PTYs. If mutually exclusive access is not used, two clients may open the same console, which results in corruption on both clients as both of them race to read data from the PTY. Two approaches are used to ensure this: 1) Internal data structure holding open PTYs. This is used internally and enables the user to forcibly terminate another console connection eg. when somebody leaves the console open on another host. 2) UUCP style lock files: This uses UUCP lock files according to the FHS ( http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLOCKLOCKFILES ) to check if other programs (like minicom) are not using the pty device of the console. This feature is disabled by default and may be enabled using configure parameter --with-console-lock-files=/path/to/lock/file/directory or --with-console-lock-files=auto (which tries to infer the location from OS used (currently only linux). On usual linux systems, normal users may not write to the /var/lock directory containing the locks. This poses problems while in session mode. If the current user has no access to the lockfile directory, check for presence of the file is still done, but no lock file is created. This does NOT result in an error.
2011-11-25 15:25:14 +00:00
/**
conf: Rename virconsole.* to virchrdev.* This is just code motion, in preparation to rename identifiers to be less console-specific.
2013-01-02 15:38:51 +00:00
* virchrdev.h: api to guarantee mutually exclusive
conf: Rename console-specific identifiers to be more generic The functionality provided in virchrdev.c (previously virconsole.c) is applicable to other types of character devices besides consoles, such as channels. This patch is just code motion, renaming things such as "console" or "pty", instead using more general terms such as "character device" or "device path".
2013-01-02 15:38:52 +00:00
* access to domain's character devices
util: Add helpers for safe domain console operations This patch adds a set of functions used in creating console streams for domains using PTYs and ensures mutually exclusive access to the PTYs. If mutually exclusive access is not used, two clients may open the same console, which results in corruption on both clients as both of them race to read data from the PTY. Two approaches are used to ensure this: 1) Internal data structure holding open PTYs. This is used internally and enables the user to forcibly terminate another console connection eg. when somebody leaves the console open on another host. 2) UUCP style lock files: This uses UUCP lock files according to the FHS ( http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLOCKLOCKFILES ) to check if other programs (like minicom) are not using the pty device of the console. This feature is disabled by default and may be enabled using configure parameter --with-console-lock-files=/path/to/lock/file/directory or --with-console-lock-files=auto (which tries to infer the location from OS used (currently only linux). On usual linux systems, normal users may not write to the /var/lock directory containing the locks. This poses problems while in session mode. If the current user has no access to the lockfile directory, check for presence of the file is still done, but no lock file is created. This does NOT result in an error.
2011-11-25 15:25:14 +00:00
*
* Copyright (C) 2011-2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
maint: fix up copyright notice inconsistencies https://www.gnu.org/licenses/gpl-howto.html recommends that the 'If not, see <url>.' phrase be a separate sentence. * tests/securityselinuxhelper.c: Remove doubled line. * tests/securityselinuxtest.c: Likewise. * globally: s/; If/. If/
2012-09-20 22:30:55 +00:00
* License along with this library. If not, see
Desert the FSF address in copyright Per the FSF address could be changed from time to time, and GNU recommends the following now: (http://www.gnu.org/licenses/gpl-howto.html) You should have received a copy of the GNU General Public License along with Foobar. If not, see <http://www.gnu.org/licenses/>. This patch removes the explicit FSF address, and uses above instead (of course, with inserting 'Lesser' before 'General'). Except a bunch of files for security driver, all others are changed automatically, the copyright for securify files are not complete, that's why to do it manually: src/security/security_selinux.h src/security/security_driver.h src/security/security_selinux.c src/security/security_apparmor.h src/security/security_apparmor.c src/security/security_driver.c
2012-07-21 10:06:23 +00:00
* <http://www.gnu.org/licenses/>.
util: Add helpers for safe domain console operations This patch adds a set of functions used in creating console streams for domains using PTYs and ensures mutually exclusive access to the PTYs. If mutually exclusive access is not used, two clients may open the same console, which results in corruption on both clients as both of them race to read data from the PTY. Two approaches are used to ensure this: 1) Internal data structure holding open PTYs. This is used internally and enables the user to forcibly terminate another console connection eg. when somebody leaves the console open on another host. 2) UUCP style lock files: This uses UUCP lock files according to the FHS ( http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLOCKLOCKFILES ) to check if other programs (like minicom) are not using the pty device of the console. This feature is disabled by default and may be enabled using configure parameter --with-console-lock-files=/path/to/lock/file/directory or --with-console-lock-files=auto (which tries to infer the location from OS used (currently only linux). On usual linux systems, normal users may not write to the /var/lock directory containing the locks. This poses problems while in session mode. If the current user has no access to the lockfile directory, check for presence of the file is still done, but no lock file is created. This does NOT result in an error.
2011-11-25 15:25:14 +00:00
*
* Author: Peter Krempa <pkrempa@redhat.com>
*/
conf: Rename console-specific identifiers to be more generic The functionality provided in virchrdev.c (previously virconsole.c) is applicable to other types of character devices besides consoles, such as channels. This patch is just code motion, renaming things such as "console" or "pty", instead using more general terms such as "character device" or "device path".
2013-01-02 15:38:52 +00:00
#ifndef __VIR_CHRDEV_H__
# define __VIR_CHRDEV_H__
util: Add helpers for safe domain console operations This patch adds a set of functions used in creating console streams for domains using PTYs and ensures mutually exclusive access to the PTYs. If mutually exclusive access is not used, two clients may open the same console, which results in corruption on both clients as both of them race to read data from the PTY. Two approaches are used to ensure this: 1) Internal data structure holding open PTYs. This is used internally and enables the user to forcibly terminate another console connection eg. when somebody leaves the console open on another host. 2) UUCP style lock files: This uses UUCP lock files according to the FHS ( http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLOCKLOCKFILES ) to check if other programs (like minicom) are not using the pty device of the console. This feature is disabled by default and may be enabled using configure parameter --with-console-lock-files=/path/to/lock/file/directory or --with-console-lock-files=auto (which tries to infer the location from OS used (currently only linux). On usual linux systems, normal users may not write to the /var/lock directory containing the locks. This poses problems while in session mode. If the current user has no access to the lockfile directory, check for presence of the file is still done, but no lock file is created. This does NOT result in an error.
2011-11-25 15:25:14 +00:00
# include "internal.h"
conf: Add unix socket support to virChrdevOpen This also changes the function signature to take a virDomainChrSourceDefPtr instead of just a path, since it needs to differentiate behavior based on source->type.
2013-01-02 15:38:53 +00:00
# include "domain_conf.h"
util: Add helpers for safe domain console operations This patch adds a set of functions used in creating console streams for domains using PTYs and ensures mutually exclusive access to the PTYs. If mutually exclusive access is not used, two clients may open the same console, which results in corruption on both clients as both of them race to read data from the PTY. Two approaches are used to ensure this: 1) Internal data structure holding open PTYs. This is used internally and enables the user to forcibly terminate another console connection eg. when somebody leaves the console open on another host. 2) UUCP style lock files: This uses UUCP lock files according to the FHS ( http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLOCKLOCKFILES ) to check if other programs (like minicom) are not using the pty device of the console. This feature is disabled by default and may be enabled using configure parameter --with-console-lock-files=/path/to/lock/file/directory or --with-console-lock-files=auto (which tries to infer the location from OS used (currently only linux). On usual linux systems, normal users may not write to the /var/lock directory containing the locks. This poses problems while in session mode. If the current user has no access to the lockfile directory, check for presence of the file is still done, but no lock file is created. This does NOT result in an error.
2011-11-25 15:25:14 +00:00
conf: Rename console-specific identifiers to be more generic The functionality provided in virchrdev.c (previously virconsole.c) is applicable to other types of character devices besides consoles, such as channels. This patch is just code motion, renaming things such as "console" or "pty", instead using more general terms such as "character device" or "device path".
2013-01-02 15:38:52 +00:00
typedef struct _virChrdevs virChrdevs;
typedef virChrdevs *virChrdevsPtr;
util: Add helpers for safe domain console operations This patch adds a set of functions used in creating console streams for domains using PTYs and ensures mutually exclusive access to the PTYs. If mutually exclusive access is not used, two clients may open the same console, which results in corruption on both clients as both of them race to read data from the PTY. Two approaches are used to ensure this: 1) Internal data structure holding open PTYs. This is used internally and enables the user to forcibly terminate another console connection eg. when somebody leaves the console open on another host. 2) UUCP style lock files: This uses UUCP lock files according to the FHS ( http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLOCKLOCKFILES ) to check if other programs (like minicom) are not using the pty device of the console. This feature is disabled by default and may be enabled using configure parameter --with-console-lock-files=/path/to/lock/file/directory or --with-console-lock-files=auto (which tries to infer the location from OS used (currently only linux). On usual linux systems, normal users may not write to the /var/lock directory containing the locks. This poses problems while in session mode. If the current user has no access to the lockfile directory, check for presence of the file is still done, but no lock file is created. This does NOT result in an error.
2011-11-25 15:25:14 +00:00
conf: Rename console-specific identifiers to be more generic The functionality provided in virchrdev.c (previously virconsole.c) is applicable to other types of character devices besides consoles, such as channels. This patch is just code motion, renaming things such as "console" or "pty", instead using more general terms such as "character device" or "device path".
2013-01-02 15:38:52 +00:00
virChrdevsPtr virChrdevAlloc(void);
void virChrdevFree(virChrdevsPtr devs);
util: Add helpers for safe domain console operations This patch adds a set of functions used in creating console streams for domains using PTYs and ensures mutually exclusive access to the PTYs. If mutually exclusive access is not used, two clients may open the same console, which results in corruption on both clients as both of them race to read data from the PTY. Two approaches are used to ensure this: 1) Internal data structure holding open PTYs. This is used internally and enables the user to forcibly terminate another console connection eg. when somebody leaves the console open on another host. 2) UUCP style lock files: This uses UUCP lock files according to the FHS ( http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLOCKLOCKFILES ) to check if other programs (like minicom) are not using the pty device of the console. This feature is disabled by default and may be enabled using configure parameter --with-console-lock-files=/path/to/lock/file/directory or --with-console-lock-files=auto (which tries to infer the location from OS used (currently only linux). On usual linux systems, normal users may not write to the /var/lock directory containing the locks. This poses problems while in session mode. If the current user has no access to the lockfile directory, check for presence of the file is still done, but no lock file is created. This does NOT result in an error.
2011-11-25 15:25:14 +00:00
conf: Add unix socket support to virChrdevOpen This also changes the function signature to take a virDomainChrSourceDefPtr instead of just a path, since it needs to differentiate behavior based on source->type.
2013-01-02 15:38:53 +00:00
int virChrdevOpen(virChrdevsPtr devs, virDomainChrSourceDefPtr source,
virStreamPtr st, bool force);
conf: Rename console-specific identifiers to be more generic The functionality provided in virchrdev.c (previously virconsole.c) is applicable to other types of character devices besides consoles, such as channels. This patch is just code motion, renaming things such as "console" or "pty", instead using more general terms such as "character device" or "device path".
2013-01-02 15:38:52 +00:00
#endif /*__VIR_CHRDEV_H__*/
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