lsm_daemon.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <sys/types.h>
#include <pwd.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>
#include <stdarg.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/queue.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <libgen.h>
#include <assert.h>
#include <grp.h>
#include <limits.h>
#include <libconfig.h>

Include dependency graph for lsm_daemon.c:

Go to the source code of this file.

Data Structures
struct	plugin
Defines
#define	_GNU_SOURCE
#define	BASE_DIR "/var/run/lsm"
#define	SOCKET_DIR BASE_DIR"/ipc"
#define	PLUGIN_DIR "/usr/bin"
#define	LSM_USER "libstoragemgmt"
#define	LSM_CONF_DIR "/etc/lsm/"
#define	LSM_PLUGIN_CONF_DIR_NAME "pluginconf.d"
#define	LSMD_CONF_FILE "lsmd.conf"
#define	LSM_CONF_ALLOW_ROOT_OPT_NAME "allow-plugin-root-privilege"
#define	LSM_CONF_REQUIRE_ROOT_OPT_NAME "require-root-privilege"
#define	min(a, b)
#define	max(a, b)
#define	log_and_exit(fmt,...) logger(LOG_ERR, fmt, ##__VA_ARGS__)
#define	warn(fmt,...) logger(LOG_WARNING, fmt, ##__VA_ARGS__)
#define	info(fmt,...) logger(LOG_INFO, fmt, ##__VA_ARGS__)
Typedefs
typedef int(*	file_op )(void p, char full_file_path)
Enumerations
enum	serve_type { RUNNING, RESTART, EXIT }
Functions
	LIST_HEAD (plugin_list, plugin)
void	signal_handler (int s)
void	install_sh (void)
void	drop_privileges (void)
void	flight_check (void)
void	usage (void)
char *	path_form (const char path, const char name)
void	process_directory (char dir, void p, file_op call_back)
int	delete_socket (void p, char full_name)
void	clean_sockets ()
int	setup_socket (char *full_name)
void	empty_plugin_list (struct plugin_list *list)
void	parse_conf_bool (char conf_path, char key_name, int *value)
int	chk_pconf_root_pri (char *plugin_path)
int	process_plugin (void p, char full_name)
void	child_cleanup (void)
void	clean_up (void)
int	process_plugins (void)
struct plugin *	plugin_lookup (int fd)
void	exec_plugin (char *plugin, int client_fd, int require_root)
void	_serving (void)
void	serve (void)
int	main (int argc, char *argv[])
Variables
int	verbose_flag = 0
int	systemd = 0
char *	socket_dir = SOCKET_DIR
char *	plugin_dir = PLUGIN_DIR
char *	conf_dir = LSM_CONF_DIR
char	plugin_extension [] = "_lsmplugin"
char	plugin_conf_extension [] = ".conf"
serve_type	serve_state = RUNNING
int	plugin_mem_debug = 0
int	allow_root_plugin = 0
int	has_root_plugin = 0

Define Documentation

#define _GNU_SOURCE

Definition at line 19 of file lsm_daemon.c.

#define BASE_DIR "/var/run/lsm"

Definition at line 47 of file lsm_daemon.c.

#define info	(	fmt,
		...		)	logger(LOG_INFO, fmt, ##__VA_ARGS__)

Definition at line 136 of file lsm_daemon.c.

#define log_and_exit	(	fmt,
		...		)	logger(LOG_ERR, fmt, ##__VA_ARGS__)

Definition at line 134 of file lsm_daemon.c.

#define LSM_CONF_ALLOW_ROOT_OPT_NAME "allow-plugin-root-privilege"

Definition at line 54 of file lsm_daemon.c.

#define LSM_CONF_DIR "/etc/lsm/"

Definition at line 51 of file lsm_daemon.c.

#define LSM_CONF_REQUIRE_ROOT_OPT_NAME "require-root-privilege"

Definition at line 55 of file lsm_daemon.c.

#define LSM_PLUGIN_CONF_DIR_NAME "pluginconf.d"

Definition at line 52 of file lsm_daemon.c.

#define LSM_USER "libstoragemgmt"

Definition at line 50 of file lsm_daemon.c.

#define LSMD_CONF_FILE "lsmd.conf"

Definition at line 53 of file lsm_daemon.c.

#define max	(	a,
		b		)

Value:

({ __typeof__ (a) _a = (a); \
       __typeof__ (b) _b = (b); \
     _a > _b ? _a : _b; })

Definition at line 62 of file lsm_daemon.c.

#define min	(	a,
		b		)

Value:

({ __typeof__ (a) _a = (a); \
       __typeof__ (b) _b = (b); \
     _a < _b ? _a : _b; })

Definition at line 57 of file lsm_daemon.c.

#define PLUGIN_DIR "/usr/bin"

Definition at line 49 of file lsm_daemon.c.

#define SOCKET_DIR BASE_DIR"/ipc"

Definition at line 48 of file lsm_daemon.c.

#define warn	(	fmt,
		...		)	logger(LOG_WARNING, fmt, ##__VA_ARGS__)

Definition at line 135 of file lsm_daemon.c.

Typedef Documentation

typedef int(* file_op)(void *p, char *full_file_path)

Definition at line 254 of file lsm_daemon.c.

Enumeration Type Documentation

enum serve_type

Enumerator:

RUNNING
RESTART
EXIT

Definition at line 78 of file lsm_daemon.c.

Function Documentation

void _serving ( void )

Main event loop

Definition at line 739 of file lsm_daemon.c.

Here is the call graph for this function:

Here is the caller graph for this function:

void child_cleanup ( void )

Cleans up any children that have exited.

Definition at line 559 of file lsm_daemon.c.

Here is the caller graph for this function:

int chk_pconf_root_pri ( char * plugin_path )

Load plugin config for root privilege setting. If config not found, return 0 for no root privilege required.

Parameters:

plugin_path

Full path of plugin

Returns:: 1 for require root privilege, 0 or not.

Definition at line 474 of file lsm_daemon.c.

Here is the call graph for this function:

Here is the caller graph for this function:

void clean_sockets ( )

Walk the IPC socket directory and remove the socket files.

Definition at line 339 of file lsm_daemon.c.

Here is the call graph for this function:

Here is the caller graph for this function:

void clean_up ( void )

Closes and frees memory and removes Unix domain sockets.

Definition at line 592 of file lsm_daemon.c.

Here is the call graph for this function:

Here is the caller graph for this function:

int delete_socket	(	void *	p,
		char *	full_name
	)

Callback to remove a unix domain socket by deleting it.

Parameters:

	p	Call back data
	full_name	Full path an and file name

Returns:: 0 to continue processing, anything else to stop.

Definition at line 317 of file lsm_daemon.c.

Here is the caller graph for this function:

void drop_privileges ( void )

If we are running as root, we will try to drop our privs. to our default user.

Definition at line 169 of file lsm_daemon.c.

Here is the caller graph for this function:

void empty_plugin_list ( struct plugin_list * list )

Closes all the listening sockets and re-claims memory in linked list.

Parameters:

list

Definition at line 409 of file lsm_daemon.c.

Here is the caller graph for this function:

void exec_plugin	(	char *	plugin,
		int	client_fd,
		int	require_root
	)

Does the actual fork and exec of the plug-in

Parameters:

	plugin	Full filename and path of plug-in to exec.
	client_fd	Client connected file descriptor
	require_root	int, indicate whether this plugin require root privilege or not

Definition at line 638 of file lsm_daemon.c.

Here is the call graph for this function:

Here is the caller graph for this function:

void flight_check ( void )

Check to make sure we have access to the directories of interest

Definition at line 203 of file lsm_daemon.c.

Here is the caller graph for this function:

void install_sh ( void )

Installs our signal handler

Definition at line 154 of file lsm_daemon.c.

Here is the call graph for this function:

Here is the caller graph for this function:

LIST_HEAD	(	plugin_list	,
		plugin
	)

Linked list of plug-ins

Definition at line 99 of file lsm_daemon.c.

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 810 of file lsm_daemon.c.

Here is the call graph for this function:

void parse_conf_bool	(	char *	conf_path,
		char *	key_name,
		int *	value
	)

Parse config and seeking provided key name bool 1. Keep value untouched if file not exist 2. If file is not readable, abort via log_and_exit() 3. Keep value untouched if provided key not found 4. Abort via log_and_exit() if no enough memory.

Parameters: