/* * 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; 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_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; env = getenv("UDEV_NO_SLEEP"); if (env && string_is_true(env)) udev_sleep = 0; 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); leading_slash(udev_root); continue; } if (strcasecmp(variable, "udev_db") == 0) { strfieldcpy(udev_db_filename, value); continue; } if (strcasecmp(variable, "udev_rules") == 0) { strfieldcpy(udev_rules_filename, value); no_leading_slash(udev_rules_filename); continue; } if (strcasecmp(variable, "udev_permissions") == 0) { strfieldcpy(udev_permissions_filename, value); no_leading_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_leading_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_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("udev_root = %s", udev_root); dbg("udev_config_filename = %s", udev_config_filename); dbg("udev_db_filename = %s", udev_db_filename); 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(); }