[thirdparty/systemd.git] / udev_config.c

/*
 * udev_config.c
 *
 * Userspace devfs
 *
 * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
 *
 *
 *	This program is free software; you can redistribute it and/or modify it
 *	under the terms of the GNU General Public License as published by the
 *	Free Software Foundation version 2 of the License.
 * 
 *	This program 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
 *	General Public License for more details.
 * 
 *	You should have received a copy of the GNU General Public License along
 *	with this program; if not, write to the Free Software Foundation, Inc.,
 *	675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* define this to enable parsing debugging */
/* #define DEBUG_PARSER */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>

#include "udev.h"
#include "udev_version.h"
#include "logging.h"
#include "namedev.h"
#include "libsysfs/libsysfs.h"

/* global variables */
char sysfs_path[SYSFS_PATH_MAX];
char udev_root[PATH_MAX];
char udev_db_filename[PATH_MAX+NAME_MAX];
char udev_permissions_filename[PATH_MAX+NAME_MAX];
char udev_rules_filename[PATH_MAX+NAME_MAX];
char udev_config_filename[PATH_MAX+NAME_MAX];
char default_mode_str[MODE_SIZE];
char default_owner_str[OWNER_SIZE];
char default_group_str[GROUP_SIZE];
int udev_log;
int udev_sleep;


static int string_is_true(char *str)
{
	if (strcasecmp(str, "true") == 0)
		return 1;
	if (strcasecmp(str, "yes") == 0)
		return 1;
	return 0;
}

static void init_variables(void)
{
	/* fill up the defaults.  
	 * If any config values are specified, they will
	 * override these values. */
	strfieldcpy(udev_root, UDEV_ROOT);
	strfieldcpy(udev_db_filename, UDEV_DB);
	strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE);
	strfieldcpy(udev_rules_filename, UDEV_RULES_FILE);
	strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE);
	udev_log = string_is_true(UDEV_LOG_DEFAULT);

	udev_sleep = 1;
	if (getenv("UDEV_NO_SLEEP") != NULL)
		udev_sleep = 0;
}

#define set_var(_name, _var)				\
	if (strcasecmp(variable, _name) == 0) {		\
		dbg_parse("%s = '%s'", _name, value);	\
		strncpy(_var, value, sizeof(_var));	\
	}

#define set_bool(_name, _var)				\
	if (strcasecmp(variable, _name) == 0) {		\
		dbg_parse("%s = '%s'", _name, value);	\
		_var = string_is_true(value);		\
	}

int parse_get_pair(char **orig_string, char **left, char **right)
{
	char *temp;
	char *string = *orig_string;

	if (!string)
		return -ENODEV;

	/* eat any whitespace */
	while (isspace(*string) || *string == ',')
		++string;

	/* split based on '=' */
	temp = strsep(&string, "=");
	*left = temp;
	if (!string)
		return -ENODEV;

	/* take the right side and strip off the '"' */
	while (isspace(*string))
		++string;
	if (*string == '"')
		++string;
	else
		return -ENODEV;

	temp = strsep(&string, "\"");
	if (!string || *temp == '\0')
		return -ENODEV;
	*right = temp;
	*orig_string = string;
	
	return 0;
}

static int parse_config_file(void)
{
	char line[255];
	char *temp;
	char *variable;
	char *value;
	FILE *fd;
	int lineno = 0;
	int retval = 0;
	
	fd = fopen(udev_config_filename, "r");
	if (fd != NULL) {
		dbg("reading '%s' as config file", udev_config_filename);
	} else {
		dbg("can't open '%s' as config file", udev_config_filename);
		return -ENODEV;
	}

	/* loop through the whole file */
	while (1) {
		/* get a line */
		temp = fgets(line, sizeof(line), fd);
		if (temp == NULL)
			goto exit;
		lineno++;

		dbg_parse("read '%s'", temp);

		/* eat the whitespace at the beginning of the line */
		while (isspace(*temp))
			++temp;

		/* empty line? */
		if (*temp == 0x00)
			continue;

		/* see if this is a comment */
		if (*temp == COMMENT_CHARACTER)
			continue;

		retval = parse_get_pair(&temp, &variable, &value);
		if (retval)
			break;
		
		dbg_parse("variable = '%s', value = '%s'", variable, value);

		set_var("udev_root", udev_root);
		set_var("udev_db", udev_db_filename);
		set_var("udev_rules", udev_rules_filename);
		set_var("udev_permissions", udev_permissions_filename);
		set_var("default_mode", default_mode_str);
		set_var("default_owner", default_owner_str);
		set_var("default_group", default_group_str);
		set_bool("udev_log", udev_log);
	}
	dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
		  lineno, temp - line, temp);
exit:
	fclose(fd);
	return retval;
}

static void get_dirs(void)
{
	char *temp;
	int retval;

	retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
	if (retval)
		dbg("sysfs_get_mnt_path failed");

	/* see if we should try to override any of the default values */
	temp = getenv("UDEV_TEST");
	if (temp != NULL) {
		/* hm testing is happening, use the specified values, if they are present */
		temp = getenv("SYSFS_PATH");
		if (temp)
			strfieldcpy(sysfs_path, temp);
		temp = getenv("UDEV_CONFIG_FILE");
		if (temp)
			strfieldcpy(udev_config_filename, temp);
	}
	dbg("sysfs_path='%s'", sysfs_path);

	dbg_parse("udev_root = %s", udev_root);
	dbg_parse("udev_config_filename = %s", udev_config_filename);
	dbg_parse("udev_db_filename = %s", udev_db_filename);
	dbg_parse("udev_rules_filename = %s", udev_rules_filename);
	dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
	dbg_parse("udev_log = %d", udev_log);
	parse_config_file();

	dbg_parse("udev_root = %s", udev_root);
	dbg_parse("udev_config_filename = %s", udev_config_filename);
	dbg_parse("udev_db_filename = %s", udev_db_filename);
	dbg_parse("udev_rules_filename = %s", udev_rules_filename);
	dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
	dbg_parse("udev_log_str = %d", udev_log);
}

void udev_init_config(void)
{
	init_variables();
	get_dirs();
}
Commit	Line	Data
e8baccca GKH	1	/*
	2	* udev_config.c
	3	*
	4	* Userspace devfs
	5	*
274812b5	6	* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
e8baccca GKH	7	*
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation version 2 of the License.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along
	19	* with this program; if not, write to the Free Software Foundation, Inc.,
	20	* 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*
	22	*/
	23
	24	/* define this to enable parsing debugging */
	25	/* #define DEBUG_PARSER */
	26
	27	#include <stdlib.h>
	28	#include <string.h>
	29	#include <stdio.h>
	30	#include <fcntl.h>
	31	#include <unistd.h>
	32	#include <errno.h>
	33	#include <ctype.h>
	34
	35	#include "udev.h"
	36	#include "udev_version.h"
54988802	37	#include "logging.h"
e8baccca GKH	38	#include "namedev.h"
	39	#include "libsysfs/libsysfs.h"
	40
	41	/* global variables */
	42	char sysfs_path[SYSFS_PATH_MAX];
e8baccca GKH	43	char udev_root[PATH_MAX];
e8baccca GKH	44	char udev_db_filename[PATH_MAX+NAME_MAX];
3836a3c4	45	char udev_permissions_filename[PATH_MAX+NAME_MAX];
e8baccca GKH	46	char udev_rules_filename[PATH_MAX+NAME_MAX];
e8baccca GKH	47	char udev_config_filename[PATH_MAX+NAME_MAX];
765cbd97	48	char default_mode_str[MODE_SIZE];
74c73ef9	49	char default_owner_str[OWNER_SIZE];
74c73ef9	50	char default_group_str[GROUP_SIZE];
51a8bb2f	51	int udev_log;
961e4784	52	int udev_sleep;
e8baccca GKH	53
e8baccca GKH	54
51a8bb2f GKH	55	static int string_is_true(char *str)
	56	{
	57	if (strcasecmp(str, "true") == 0)
	58	return 1;
	59	if (strcasecmp(str, "yes") == 0)
	60	return 1;
	61	return 0;
	62	}
	63
e8baccca GKH	64	static void init_variables(void)
e8baccca GKH	65	{
3836a3c4 GKH	66	/* fill up the defaults.
	67	* If any config values are specified, they will
	68	* override these values. */
e8baccca	69	strfieldcpy(udev_root, UDEV_ROOT);
3836a3c4 GKH	70	strfieldcpy(udev_db_filename, UDEV_DB);
	71	strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE);
	72	strfieldcpy(udev_rules_filename, UDEV_RULES_FILE);
	73	strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE);
51a8bb2f	74	udev_log = string_is_true(UDEV_LOG_DEFAULT);
961e4784 GKH	75
	76	udev_sleep = 1;
	77	if (getenv("UDEV_NO_SLEEP") != NULL)
	78	udev_sleep = 0;
e8baccca GKH	79	}
	80
	81	#define set_var(_name, _var) \
	82	if (strcasecmp(variable, _name) == 0) { \
	83	dbg_parse("%s = '%s'", _name, value); \
	84	strncpy(_var, value, sizeof(_var)); \
	85	}
	86
51a8bb2f GKH	87	#define set_bool(_name, _var) \
	88	if (strcasecmp(variable, _name) == 0) { \
	89	dbg_parse("%s = '%s'", _name, value); \
	90	_var = string_is_true(value); \
	91	}
	92
274812b5 GKH	93	int parse_get_pair(char orig_string, char left, char **right)
	94	{
	95	char *temp;
	96	char string = orig_string;
	97
	98	if (!string)
	99	return -ENODEV;
	100
	101	/* eat any whitespace */
	102	while (isspace(string) \|\| string == ',')
	103	++string;
	104
	105	/* split based on '=' */
	106	temp = strsep(&string, "=");
	107	*left = temp;
	108	if (!string)
	109	return -ENODEV;
	110
	111	/* take the right side and strip off the '"' */
	112	while (isspace(*string))
	113	++string;
	114	if (*string == '"')
	115	++string;
	116	else
	117	return -ENODEV;
	118
	119	temp = strsep(&string, "\"");
	120	if (!string \|\| *temp == '\0')
	121	return -ENODEV;
	122	*right = temp;
	123	*orig_string = string;
	124
	125	return 0;
	126	}
	127
e8baccca GKH	128	static int parse_config_file(void)
	129	{
	130	char line[255];
	131	char *temp;
	132	char *variable;
	133	char *value;
	134	FILE *fd;
	135	int lineno = 0;
	136	int retval = 0;
	137
	138	fd = fopen(udev_config_filename, "r");
	139	if (fd != NULL) {
	140	dbg("reading '%s' as config file", udev_config_filename);
	141	} else {
	142	dbg("can't open '%s' as config file", udev_config_filename);
	143	return -ENODEV;
	144	}
	145
	146	/* loop through the whole file */
	147	while (1) {
	148	/* get a line */
	149	temp = fgets(line, sizeof(line), fd);
	150	if (temp == NULL)
	151	goto exit;
	152	lineno++;
	153
	154	dbg_parse("read '%s'", temp);
	155
	156	/* eat the whitespace at the beginning of the line */
	157	while (isspace(*temp))
	158	++temp;
	159
	160	/* empty line? */
	161	if (*temp == 0x00)
	162	continue;
	163
	164	/* see if this is a comment */
	165	if (*temp == COMMENT_CHARACTER)
	166	continue;
	167
274812b5	168	retval = parse_get_pair(&temp, &variable, &value);
e8baccca GKH	169	if (retval)
	170	break;
	171
	172	dbg_parse("variable = '%s', value = '%s'", variable, value);
	173
	174	set_var("udev_root", udev_root);
	175	set_var("udev_db", udev_db_filename);
	176	set_var("udev_rules", udev_rules_filename);
3836a3c4	177	set_var("udev_permissions", udev_permissions_filename);
e8baccca	178	set_var("default_mode", default_mode_str);
74c73ef9	179	set_var("default_owner", default_owner_str);
74c73ef9	180	set_var("default_group", default_group_str);
51a8bb2f	181	set_bool("udev_log", udev_log);
e8baccca GKH	182	}
	183	dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
	184	lineno, temp - line, temp);
	185	exit:
	186	fclose(fd);
	187	return retval;
	188	}
	189
	190	static void get_dirs(void)
	191	{
	192	char *temp;
e8baccca GKH	193	int retval;
	194
	195	retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
	196	if (retval)
	197	dbg("sysfs_get_mnt_path failed");
	198
	199	/* see if we should try to override any of the default values */
	200	temp = getenv("UDEV_TEST");
	201	if (temp != NULL) {
	202	/* hm testing is happening, use the specified values, if they are present */
	203	temp = getenv("SYSFS_PATH");
	204	if (temp)
	205	strfieldcpy(sysfs_path, temp);
e8baccca GKH	206	temp = getenv("UDEV_CONFIG_FILE");
e8baccca GKH	207	if (temp)
3836a3c4	208	strfieldcpy(udev_config_filename, temp);
e8baccca GKH	209	}
	210	dbg("sysfs_path='%s'", sysfs_path);
	211
e8baccca GKH	212	dbg_parse("udev_root = %s", udev_root);
	213	dbg_parse("udev_config_filename = %s", udev_config_filename);
	214	dbg_parse("udev_db_filename = %s", udev_db_filename);
	215	dbg_parse("udev_rules_filename = %s", udev_rules_filename);
3836a3c4	216	dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
51a8bb2f	217	dbg_parse("udev_log = %d", udev_log);
e8baccca GKH	218	parse_config_file();
	219
	220	dbg_parse("udev_root = %s", udev_root);
	221	dbg_parse("udev_config_filename = %s", udev_config_filename);
	222	dbg_parse("udev_db_filename = %s", udev_db_filename);
	223	dbg_parse("udev_rules_filename = %s", udev_rules_filename);
3836a3c4	224	dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
51a8bb2f	225	dbg_parse("udev_log_str = %d", udev_log);
e8baccca GKH	226	}
	227
	228	void udev_init_config(void)
	229	{
	230	init_variables();
	231	get_dirs();
	232	}
	233
	234