udev_config.c revision 2b41e68a08548ce44b4d145900dab2bb04cd34f7
/*
* 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_path[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_dev_d;
static int string_is_true(char *str)
{
if (strcasecmp(str, "true") == 0)
return 1;
if (strcasecmp(str, "yes") == 0)
return 1;
if (strcasecmp(str, "1") == 0)
return 1;
return 0;
}
static void init_variables(void)
{
char *env;
/* fill up the defaults.
* If any config values are specified, they will
* override these values. */
strfieldcpy(udev_root, UDEV_ROOT);
strfieldcpy(udev_db_path, 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_dev_d = 1;
env = getenv("UDEV_NO_DEVD");
if (env && string_is_true(env))
udev_dev_d = 0;
}
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[LINE_SIZE];
char *bufline;
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 (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
bufline = &buf[cur];
cur += count+1;
lineno++;
if (count >= LINE_SIZE) {
info("line too long, conf line skipped %s, line %d",
udev_config_filename, lineno);
continue;
}
/* eat the whitespace */
while ((count > 0) && isspace(bufline[0])) {
bufline++;
count--;
}
if (count == 0)
continue;
/* see if this is a comment */
if (bufline[0] == COMMENT_CHARACTER)
continue;
strncpy(line, bufline, count);
line[count] = '\0';
temp = line;
dbg_parse("read '%s'", temp);
retval = parse_get_pair(&temp, &variable, &value);
if (retval != 0)
info("%s:%d:%Zd: error parsing '%s'",
udev_config_filename, lineno, temp-line, temp);
dbg_parse("variable='%s', value='%s'", variable, value);
if (strcasecmp(variable, "udev_root") == 0) {
strfieldcpy(udev_root, value);
no_trailing_slash(udev_root);
continue;
}
if (strcasecmp(variable, "udev_db") == 0) {
strfieldcpy(udev_db_path, value);
no_trailing_slash(udev_db_path);
continue;
}
if (strcasecmp(variable, "udev_rules") == 0) {
strfieldcpy(udev_rules_filename, value);
no_trailing_slash(udev_rules_filename);
continue;
}
if (strcasecmp(variable, "udev_permissions") == 0) {
strfieldcpy(udev_permissions_filename, value);
no_trailing_slash(udev_permissions_filename);
continue;
}
if (strcasecmp(variable, "default_mode") == 0) {
strfieldcpy(default_mode_str, value);
continue;
}
if (strcasecmp(variable, "default_owner") == 0) {
strfieldcpy(default_owner_str, value);
continue;
}
if (strcasecmp(variable, "default_group") == 0) {
strfieldcpy(default_group_str, value);
continue;
}
if (strcasecmp(variable, "udev_log") == 0) {
udev_log = string_is_true(value);
continue;
}
info("%s:%d:%Zd: unknown key '%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 */
if (getenv("UDEV_TEST") != NULL) {
temp = getenv("SYSFS_PATH");
if (temp != NULL) {
strfieldcpy(sysfs_path, temp);
no_trailing_slash(sysfs_path);
}
temp = getenv("UDEV_CONFIG_FILE");
if (temp != NULL)
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_path = %s", udev_db_path);
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("udev_root = %s", udev_root);
dbg("udev_config_filename = %s", udev_config_filename);
dbg("udev_db_path = %s", udev_db_path);
dbg("udev_rules_filename = %s", udev_rules_filename);
dbg("udev_permissions_filename = %s", udev_permissions_filename);
dbg("udev_log_str = %d", udev_log);
}
void udev_init_config(void)
{
init_variables();
get_dirs();
}