[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 "libsysfs/sysfs/libsysfs.h"
#include "udev.h"
#include "udev_lib.h"
#include "udev_version.h"
#include "logging.h"
#include "namedev.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;
int udev_dev_d;


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;

	udev_dev_d = 1;
	if (getenv("UDEV_NO_DEVD") != NULL)
		udev_dev_d = 0;
}

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

#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;
	char *buf;
	size_t bufsize;
	size_t cur;
	size_t count;
	int lineno;
	int retval = 0;

	if (file_map(udev_config_filename, &buf, &bufsize) == 0) {
		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 */
	lineno = 0;
	cur = 0;
	while (1) {
		count = buf_get_line(buf, bufsize, cur);

		strncpy(line, buf + cur, count);
		line[count] = '\0';
		temp = line;
		lineno++;

		cur += count+1;
		if (cur > bufsize)
			break;

		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);

	file_unmap(buf, bufsize);
	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
c80da508	35	#include "libsysfs/sysfs/libsysfs.h"
e8baccca	36	#include "udev.h"
c81b35c0	37	#include "udev_lib.h"
e8baccca	38	#include "udev_version.h"
54988802	39	#include "logging.h"
e8baccca	40	#include "namedev.h"
e8baccca GKH	41
	42	/* global variables */
	43	char sysfs_path[SYSFS_PATH_MAX];
e8baccca GKH	44	char udev_root[PATH_MAX];
e8baccca GKH	45	char udev_db_filename[PATH_MAX+NAME_MAX];
3836a3c4	46	char udev_permissions_filename[PATH_MAX+NAME_MAX];
e8baccca GKH	47	char udev_rules_filename[PATH_MAX+NAME_MAX];
e8baccca GKH	48	char udev_config_filename[PATH_MAX+NAME_MAX];
765cbd97	49	char default_mode_str[MODE_SIZE];
74c73ef9	50	char default_owner_str[OWNER_SIZE];
74c73ef9	51	char default_group_str[GROUP_SIZE];
51a8bb2f	52	int udev_log;
961e4784	53	int udev_sleep;
bbbe503e	54	int udev_dev_d;
e8baccca GKH	55
e8baccca GKH	56
51a8bb2f GKH	57	static int string_is_true(char *str)
	58	{
	59	if (strcasecmp(str, "true") == 0)
	60	return 1;
	61	if (strcasecmp(str, "yes") == 0)
	62	return 1;
	63	return 0;
	64	}
	65
e8baccca GKH	66	static void init_variables(void)
e8baccca GKH	67	{
3836a3c4 GKH	68	/* fill up the defaults.
	69	* If any config values are specified, they will
	70	* override these values. */
e8baccca	71	strfieldcpy(udev_root, UDEV_ROOT);
3836a3c4 GKH	72	strfieldcpy(udev_db_filename, UDEV_DB);
	73	strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE);
	74	strfieldcpy(udev_rules_filename, UDEV_RULES_FILE);
	75	strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE);
51a8bb2f	76	udev_log = string_is_true(UDEV_LOG_DEFAULT);
961e4784 GKH	77
	78	udev_sleep = 1;
	79	if (getenv("UDEV_NO_SLEEP") != NULL)
	80	udev_sleep = 0;
bbbe503e KS	81
	82	udev_dev_d = 1;
	83	if (getenv("UDEV_NO_DEVD") != NULL)
	84	udev_dev_d = 0;
e8baccca GKH	85	}
	86
	87	#define set_var(_name, _var) \
	88	if (strcasecmp(variable, _name) == 0) { \
9b28a52a KS	89	dbg_parse("%s='%s'", _name, value); \
9b28a52a KS	90	strfieldcpy(_var, value);\
e8baccca GKH	91	}
e8baccca GKH	92
51a8bb2f GKH	93	#define set_bool(_name, _var) \
51a8bb2f GKH	94	if (strcasecmp(variable, _name) == 0) { \
9b28a52a	95	dbg_parse("%s='%s'", _name, value); \
51a8bb2f GKH	96	_var = string_is_true(value); \
	97	}
	98
274812b5 GKH	99	int parse_get_pair(char orig_string, char left, char **right)
	100	{
	101	char *temp;
	102	char string = orig_string;
	103
	104	if (!string)
	105	return -ENODEV;
	106
	107	/* eat any whitespace */
	108	while (isspace(string) \|\| string == ',')
	109	++string;
	110
	111	/* split based on '=' */
	112	temp = strsep(&string, "=");
	113	*left = temp;
	114	if (!string)
	115	return -ENODEV;
	116
	117	/* take the right side and strip off the '"' */
	118	while (isspace(*string))
	119	++string;
	120	if (*string == '"')
	121	++string;
	122	else
	123	return -ENODEV;
	124
	125	temp = strsep(&string, "\"");
	126	if (!string \|\| *temp == '\0')
	127	return -ENODEV;
	128	*right = temp;
	129	*orig_string = string;
	130
	131	return 0;
	132	}
	133
e8baccca GKH	134	static int parse_config_file(void)
	135	{
	136	char line[255];
	137	char *temp;
	138	char *variable;
	139	char *value;
c81b35c0 KS	140	char *buf;
	141	size_t bufsize;
	142	size_t cur;
	143	size_t count;
	144	int lineno;
e8baccca	145	int retval = 0;
c81b35c0 KS	146
c81b35c0 KS	147	if (file_map(udev_config_filename, &buf, &bufsize) == 0) {
e8baccca GKH	148	dbg("reading '%s' as config file", udev_config_filename);
	149	} else {
	150	dbg("can't open '%s' as config file", udev_config_filename);
	151	return -ENODEV;
	152	}
	153
	154	/* loop through the whole file */
c81b35c0 KS	155	lineno = 0;
c81b35c0 KS	156	cur = 0;
e8baccca	157	while (1) {
c81b35c0 KS	158	count = buf_get_line(buf, bufsize, cur);
	159
	160	strncpy(line, buf + cur, count);
	161	line[count] = '\0';
	162	temp = line;
e8baccca GKH	163	lineno++;
e8baccca GKH	164
c81b35c0 KS	165	cur += count+1;
	166	if (cur > bufsize)
	167	break;
	168
e8baccca GKH	169	dbg_parse("read '%s'", temp);
	170
	171	/* eat the whitespace at the beginning of the line */
	172	while (isspace(*temp))
	173	++temp;
	174
	175	/* empty line? */
	176	if (*temp == 0x00)
	177	continue;
	178
	179	/* see if this is a comment */
	180	if (*temp == COMMENT_CHARACTER)
	181	continue;
	182
274812b5	183	retval = parse_get_pair(&temp, &variable, &value);
e8baccca GKH	184	if (retval)
	185	break;
	186
	187	dbg_parse("variable = '%s', value = '%s'", variable, value);
	188
	189	set_var("udev_root", udev_root);
	190	set_var("udev_db", udev_db_filename);
	191	set_var("udev_rules", udev_rules_filename);
3836a3c4	192	set_var("udev_permissions", udev_permissions_filename);
e8baccca	193	set_var("default_mode", default_mode_str);
74c73ef9	194	set_var("default_owner", default_owner_str);
74c73ef9	195	set_var("default_group", default_group_str);
51a8bb2f	196	set_bool("udev_log", udev_log);
e8baccca GKH	197	}
	198	dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename,
	199	lineno, temp - line, temp);
c81b35c0 KS	200
c81b35c0 KS	201	file_unmap(buf, bufsize);
e8baccca GKH	202	return retval;
	203	}
	204
	205	static void get_dirs(void)
	206	{
	207	char *temp;
e8baccca GKH	208	int retval;
	209
	210	retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
	211	if (retval)
	212	dbg("sysfs_get_mnt_path failed");
	213
	214	/* see if we should try to override any of the default values */
	215	temp = getenv("UDEV_TEST");
	216	if (temp != NULL) {
	217	/* hm testing is happening, use the specified values, if they are present */
	218	temp = getenv("SYSFS_PATH");
	219	if (temp)
	220	strfieldcpy(sysfs_path, temp);
e8baccca GKH	221	temp = getenv("UDEV_CONFIG_FILE");
e8baccca GKH	222	if (temp)
3836a3c4	223	strfieldcpy(udev_config_filename, temp);
e8baccca GKH	224	}
	225	dbg("sysfs_path='%s'", sysfs_path);
	226
e8baccca GKH	227	dbg_parse("udev_root = %s", udev_root);
	228	dbg_parse("udev_config_filename = %s", udev_config_filename);
	229	dbg_parse("udev_db_filename = %s", udev_db_filename);
	230	dbg_parse("udev_rules_filename = %s", udev_rules_filename);
3836a3c4	231	dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
51a8bb2f	232	dbg_parse("udev_log = %d", udev_log);
e8baccca GKH	233	parse_config_file();
	234
	235	dbg_parse("udev_root = %s", udev_root);
	236	dbg_parse("udev_config_filename = %s", udev_config_filename);
	237	dbg_parse("udev_db_filename = %s", udev_db_filename);
	238	dbg_parse("udev_rules_filename = %s", udev_rules_filename);
3836a3c4	239	dbg_parse("udev_permissions_filename = %s", udev_permissions_filename);
51a8bb2f	240	dbg_parse("udev_log_str = %d", udev_log);
e8baccca GKH	241	}
	242
	243	void udev_init_config(void)
	244	{
	245	init_variables();
	246	get_dirs();
	247	}
	248
	249