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/*
* 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];
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);
}
#define set_var(_name, _var) \
if (strcasecmp(variable, _name) == 0) { \
dbg_parse("%s = '%s'", _name, value); \
strncpy(_var, value, sizeof(_var)); \
}
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);
}
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);
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);
}
void udev_init_config(void)
{
init_variables();
get_dirs();
}
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