udev_config.c

   1 /*
   2  * udev_config.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
   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 "libsysfs/sysfs/libsysfs.h"
  36 #include "udev.h"
  37 #include "udev_utils.h"
  38 #include "udev_version.h"
  39 #include "logging.h"
  40 #include "namedev.h"
  41
  42 /* global variables */
  43 char sysfs_path[SYSFS_PATH_MAX];
  44 char udev_root[PATH_MAX];
  45 char udev_db_path[PATH_MAX+NAME_MAX];
  46 char udev_rules_filename[PATH_MAX+NAME_MAX];
  47 char udev_config_filename[PATH_MAX+NAME_MAX];
  48 mode_t default_mode;
  49 char default_owner[USER_SIZE];
  50 char default_group[USER_SIZE];
  51 int udev_log;
  52 int udev_dev_d;
  53 int udev_hotplug_d;
  54
  55
  56 static int string_is_true(const char *str)
  57 {
  58         if (strcasecmp(str, "true") == 0)
  59                 return 1;
  60         if (strcasecmp(str, "yes") == 0)
  61                 return 1;
  62         if (strcasecmp(str, "1") == 0)
  63                 return 1;
  64         return 0;
  65 }
  66
  67 static void init_variables(void)
  68 {
  69         const char *env;
  70
  71         /* If any config values are specified, they will override these values. */
  72         strcpy(udev_root, UDEV_ROOT);
  73         strcpy(udev_db_path, UDEV_DB);
  74         strcpy(udev_config_filename, UDEV_CONFIG_FILE);
  75         strcpy(udev_rules_filename, UDEV_RULES_FILE);
  76
  77         strcpy(default_owner, "root");
  78         strcpy(default_group, "root");
  79         default_mode = 0660;
  80
  81         udev_log = string_is_true(UDEV_LOG_DEFAULT);
  82
  83         udev_dev_d = 1;
  84         env = getenv("UDEV_NO_DEVD");
  85         if (env && string_is_true(env))
  86                 udev_dev_d = 0;
  87
  88         udev_hotplug_d = 1;
  89         env = getenv("UDEV_NO_HOTPLUGD");
  90         if (env && string_is_true(env))
  91                 udev_hotplug_d = 0;
  92 }
  93
  94 static int parse_config_file(void)
  95 {
  96         char line[LINE_SIZE];
  97         char *bufline;
  98         char *temp;
  99         char *variable;
 100         char *value;
 101         char *buf;
 102         size_t bufsize;
 103         size_t cur;
 104         size_t count;
 105         int lineno;
 106         int retval = 0;
 107
 108         if (file_map(udev_config_filename, &buf, &bufsize) == 0) {
 109                 dbg("reading '%s' as config file", udev_config_filename);
 110         } else {
 111                 dbg("can't open '%s' as config file", udev_config_filename);
 112                 return -ENODEV;
 113         }
 114
 115         /* loop through the whole file */
 116         lineno = 0;
 117         cur = 0;
 118         while (cur < bufsize) {
 119                 count = buf_get_line(buf, bufsize, cur);
 120                 bufline = &buf[cur];
 121                 cur += count+1;
 122                 lineno++;
 123
 124                 if (count >= LINE_SIZE) {
 125                         info("line too long, conf line skipped %s, line %d",
 126                                         udev_config_filename, lineno);
 127                         continue;
 128                 }
 129
 130                 /* eat the whitespace */
 131                 while ((count > 0) && isspace(bufline[0])) {
 132                         bufline++;
 133                         count--;
 134                 }
 135                 if (count == 0)
 136                         continue;
 137
 138                 /* see if this is a comment */
 139                 if (bufline[0] == COMMENT_CHARACTER)
 140                         continue;
 141
 142                 strncpy(line, bufline, count);
 143                 line[count] = '\0';
 144                 temp = line;
 145                 dbg_parse("read '%s'", temp);
 146
 147                 retval = parse_get_pair(&temp, &variable, &value);
 148                 if (retval != 0)
 149                         info("%s:%d:%Zd: error parsing '%s'",
 150                              udev_config_filename, lineno, temp-line, temp);
 151
 152                 dbg_parse("variable='%s', value='%s'", variable, value);
 153
 154                 if (strcasecmp(variable, "udev_root") == 0) {
 155                         strfieldcpy(udev_root, value);
 156                         no_trailing_slash(udev_root);
 157                         continue;
 158                 }
 159
 160                 if (strcasecmp(variable, "udev_db") == 0) {
 161                         strfieldcpy(udev_db_path, value);
 162                         no_trailing_slash(udev_db_path);
 163                         continue;
 164                 }
 165
 166                 if (strcasecmp(variable, "udev_rules") == 0) {
 167                         strfieldcpy(udev_rules_filename, value);
 168                         no_trailing_slash(udev_rules_filename);
 169                         continue;
 170                 }
 171
 172                 if (strcasecmp(variable, "default_mode") == 0) {
 173                         default_mode = strtol(value, NULL, 8);
 174                         continue;
 175                 }
 176
 177                 if (strcasecmp(variable, "default_owner") == 0) {
 178                         strfieldcpy(default_owner, value);
 179                         continue;
 180                 }
 181
 182                 if (strcasecmp(variable, "default_group") == 0) {
 183                         strfieldcpy(default_group, value);
 184                         continue;
 185                 }
 186
 187                 if (strcasecmp(variable, "udev_log") == 0) {
 188                         udev_log = string_is_true(value);
 189                         continue;
 190                 }
 191
 192                 info("%s:%d:%Zd: unknown key '%s'",
 193                      udev_config_filename, lineno, temp-line, temp);
 194         }
 195
 196         file_unmap(buf, bufsize);
 197         return retval;
 198 }
 199
 200 static void get_dirs(void)
 201 {
 202         char *temp;
 203         int retval;
 204
 205         retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
 206         if (retval)
 207                 dbg("sysfs_get_mnt_path failed");
 208
 209         /* see if we should try to override any of the default values */
 210         if (getenv("UDEV_TEST") != NULL) {
 211                 temp = getenv("SYSFS_PATH");
 212                 if (temp != NULL) {
 213                         strfieldcpy(sysfs_path, temp);
 214                         no_trailing_slash(sysfs_path);
 215                 }
 216
 217                 temp = getenv("UDEV_CONFIG_FILE");
 218                 if (temp != NULL)
 219                         strfieldcpy(udev_config_filename, temp);
 220         }
 221
 222         parse_config_file();
 223         dbg("sysfs_path='%s'", sysfs_path);
 224         dbg("udev_root='%s'", udev_root);
 225         dbg("udev_config_filename='%s'", udev_config_filename);
 226         dbg("udev_db_path='%s'", udev_db_path);
 227         dbg("udev_rules_filename='%s'", udev_rules_filename);
 228         dbg("udev_log=%d", udev_log);
 229 }
 230
 231 void udev_init_config(void)
 232 {
 233         init_variables();
 234         get_dirs();
 235 }