lib/setup.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * setup.php - Sets up sessions, connects to databases and so on
  20  *
  21  * Normally this is only called by the main config.php file
  22  * Normally this file does not need to be edited.
  23  *
  24  * @package    core
  25  * @subpackage lib
  26  * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
  27  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  28  */
  29
  30 /**
  31  * Holds the core settings that affect how Moodle works. Some of its fields
  32  * are set in config.php, and the rest are loaded from the config table.
  33  *
  34  * Some typical settings in the $CFG global:
  35  *  - $CFG->wwwroot  - Path to moodle index directory in url format.
  36  *  - $CFG->dataroot - Path to moodle data files directory on server's filesystem.
  37  *  - $CFG->dirroot  - Path to moodle's library folder on server's filesystem.
  38  *  - $CFG->libdir   - Path to moodle's library folder on server's filesystem.
  39  *
  40  * @global object $CFG
  41  * @name $CFG
  42  */
  43 global $CFG; // this should be done much earlier in config.php before creating new $CFG instance
  44
  45 if (!isset($CFG)) {
  46     if (defined('PHPUNIT_SCRIPT') and PHPUNIT_SCRIPT) {
  47         echo('There is a missing "global $CFG;" at the beginning of the config.php file.'."\n");
  48         exit(1);
  49     } else {
  50         // this should never happen, maybe somebody is accessing this file directly...
  51         exit(1);
  52     }
  53 }
  54
  55 // We can detect real dirroot path reliably since PHP 4.0.2,
  56 // it can not be anything else, there is no point in having this in config.php
  57 $CFG->dirroot = dirname(dirname(__FILE__));
  58
  59 // Normalise dataroot - we do not want any symbolic links, trailing / or any other weirdness there
  60 if (!isset($CFG->dataroot)) {
  61     if (isset($_SERVER['REMOTE_ADDR'])) {
  62         header($_SERVER['SERVER_PROTOCOL'] . ' 503 Service Unavailable');
  63     }
  64     echo('Fatal error: $CFG->dataroot is not specified in config.php! Exiting.'."\n");
  65     exit(1);
  66 }
  67 $CFG->dataroot = realpath($CFG->dataroot);
  68 if ($CFG->dataroot === false) {
  69     if (isset($_SERVER['REMOTE_ADDR'])) {
  70         header($_SERVER['SERVER_PROTOCOL'] . ' 503 Service Unavailable');
  71     }
  72     echo('Fatal error: $CFG->dataroot is not configured properly, directory does not exist or is not accessible! Exiting.'."\n");
  73     exit(1);
  74 } else if (!is_writable($CFG->dataroot)) {
  75     if (isset($_SERVER['REMOTE_ADDR'])) {
  76         header($_SERVER['SERVER_PROTOCOL'] . ' 503 Service Unavailable');
  77     }
  78     echo('Fatal error: $CFG->dataroot is not writable, admin has to fix directory permissions! Exiting.'."\n");
  79     exit(1);
  80 }
  81
  82 // wwwroot is mandatory
  83 if (!isset($CFG->wwwroot) or $CFG->wwwroot === 'http://example.com/moodle') {
  84     if (isset($_SERVER['REMOTE_ADDR'])) {
  85         header($_SERVER['SERVER_PROTOCOL'] . ' 503 Service Unavailable');
  86     }
  87     echo('Fatal error: $CFG->wwwroot is not configured! Exiting.'."\n");
  88     exit(1);
  89 }
  90
  91 // Define admin directory
  92 if (!isset($CFG->admin)) {   // Just in case it isn't defined in config.php
  93     $CFG->admin = 'admin';   // This is relative to the wwwroot and dirroot
  94 }
  95
  96 // Set up some paths.
  97 $CFG->libdir = $CFG->dirroot .'/lib';
  98
  99 // The current directory in PHP version 4.3.0 and above isn't necessarily the
 100 // directory of the script when run from the command line. The require_once()
 101 // would fail, so we'll have to chdir()
 102 if (!isset($_SERVER['REMOTE_ADDR']) && isset($_SERVER['argv'][0])) {
 103     chdir(dirname($_SERVER['argv'][0]));
 104 }
 105
 106 // sometimes default PHP settings are borked on shared hosting servers, I wonder why they have to do that??
 107 ini_set('precision', 14); // needed for upgrades and gradebook
 108
 109 // Scripts may request no debug and error messages in output
 110 // please note it must be defined before including the config.php script
 111 // and in some cases you also need to set custom default exception handler
 112 if (!defined('NO_DEBUG_DISPLAY')) {
 113     define('NO_DEBUG_DISPLAY', false);
 114 }
 115
 116 // Some scripts such as upgrade may want to prevent output buffering
 117 if (!defined('NO_OUTPUT_BUFFERING')) {
 118     define('NO_OUTPUT_BUFFERING', false);
 119 }
 120
 121 // Servers should define a default timezone in php.ini, but if they don't then make sure something is defined.
 122 // This is a quick hack.  Ideally we should ask the admin for a value.  See MDL-22625 for more on this.
 123 if (function_exists('date_default_timezone_set') and function_exists('date_default_timezone_get')) {
 124     $olddebug = error_reporting(0);
 125     date_default_timezone_set(date_default_timezone_get());
 126     error_reporting($olddebug);
 127     unset($olddebug);
 128 }
 129
 130 // PHPUnit scripts are a special case, for now we treat them as normal CLI scripts,
 131 // please note you must install PHPUnit library separately via PEAR
 132 if (!defined('PHPUNIT_SCRIPT')) {
 133     define('PHPUNIT_SCRIPT', false);
 134 }
 135 if (PHPUNIT_SCRIPT) {
 136     define('CLI_SCRIPT', true);
 137 }
 138
 139 // Detect CLI scripts - CLI scripts are executed from command line, do not have session and we do not want HTML in output
 140 // In your new CLI scripts just add "define('CLI_SCRIPT', true);" before requiring config.php.
 141 // Please note that one script can not be accessed from both CLI and web interface.
 142 if (!defined('CLI_SCRIPT')) {
 143     define('CLI_SCRIPT', false);
 144 }
 145 if (defined('WEB_CRON_EMULATED_CLI')) {
 146     if (!isset($_SERVER['REMOTE_ADDR'])) {
 147         echo('Web cron can not be executed as CLI script any more, please use admin/cli/cron.php instead'."\n");
 148         exit(1);
 149     }
 150 } else if (isset($_SERVER['REMOTE_ADDR'])) {
 151     if (CLI_SCRIPT) {
 152         echo('Command line scripts can not be executed from the web interface');
 153         exit(1);
 154     }
 155 } else {
 156     if (!CLI_SCRIPT) {
 157         echo('Command line scripts must define CLI_SCRIPT before requiring config.php'."\n");
 158         exit(1);
 159     }
 160 }
 161
 162 // Detect CLI maintenance mode - this is useful when you need to mess with database, such as during upgrades
 163 if (file_exists("$CFG->dataroot/climaintenance.html")) {
 164     if (!CLI_SCRIPT) {
 165         header('Content-type: text/html; charset=utf-8');
 166         /// Headers to make it not cacheable and json
 167         header('Cache-Control: no-store, no-cache, must-revalidate');
 168         header('Cache-Control: post-check=0, pre-check=0', false);
 169         header('Pragma: no-cache');
 170         header('Expires: Mon, 20 Aug 1969 09:23:00 GMT');
 171         header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
 172         header('Accept-Ranges: none');
 173         readfile("$CFG->dataroot/climaintenance.html");
 174         die;
 175     } else {
 176         if (!defined('CLI_MAINTENANCE')) {
 177             define('CLI_MAINTENANCE', true);
 178         }
 179     }
 180 } else {
 181     if (!defined('CLI_MAINTENANCE')) {
 182         define('CLI_MAINTENANCE', false);
 183     }
 184 }
 185
 186 // Detect ajax scripts - they are similar to CLI because we can not redirect, output html, etc.
 187 if (!defined('AJAX_SCRIPT')) {
 188     define('AJAX_SCRIPT', false);
 189 }
 190
 191 // File permissions on created directories in the $CFG->dataroot
 192 if (empty($CFG->directorypermissions)) {
 193     $CFG->directorypermissions = 02777;      // Must be octal (that's why it's here)
 194 }
 195 if (empty($CFG->filepermissions)) {
 196     $CFG->filepermissions = ($CFG->directorypermissions & 0666); // strip execute flags
 197 }
 198 // better also set default umask because recursive mkdir() does not apply permissions recursively otherwise
 199 umask(0000);
 200
 201 // exact version of currently used yui2 and 3 library
 202 $CFG->yui2version = '2.8.2';
 203 $CFG->yui3version = '3.2.0';
 204
 205
 206 // special support for highly optimised scripts that do not need libraries and DB connection
 207 if (defined('ABORT_AFTER_CONFIG')) {
 208     if (!defined('ABORT_AFTER_CONFIG_CANCEL')) {
 209         // hide debugging if not enabled in config.php - we do not want to disclose sensitive info
 210         if (isset($CFG->debug)) {
 211             error_reporting($CFG->debug);
 212         } else {
 213             error_reporting(0);
 214         }
 215         if (empty($CFG->debugdisplay)) {
 216             ini_set('display_errors', '0');
 217             ini_set('log_errors', '1');
 218         } else {
 219             ini_set('display_errors', '1');
 220         }
 221         require_once("$CFG->dirroot/lib/configonlylib.php");
 222         return;
 223     }
 224 }
 225
 226 /** Used by library scripts to check they are being called by Moodle */
 227 if (!defined('MOODLE_INTERNAL')) { // necessary because cli installer has to define it earlier
 228     define('MOODLE_INTERNAL', true);
 229 }
 230
 231 // Early profiling start, based exclusively on config.php $CFG settings
 232 if (!empty($CFG->earlyprofilingenabled)) {
 233     require_once($CFG->libdir . '/xhprof/xhprof_moodle.php');
 234     if (profiling_start()) {
 235         register_shutdown_function('profiling_stop');
 236     }
 237 }
 238
 239 /**
 240  * Database connection. Used for all access to the database.
 241  * @global moodle_database $DB
 242  * @name $DB
 243  */
 244 global $DB;
 245
 246 /**
 247  * Moodle's wrapper round PHP's $_SESSION.
 248  *
 249  * @global object $SESSION
 250  * @name $SESSION
 251  */
 252 global $SESSION;
 253
 254 /**
 255  * Holds the user table record for the current user. Will be the 'guest'
 256  * user record for people who are not logged in.
 257  *
 258  * $USER is stored in the session.
 259  *
 260  * Items found in the user record:
 261  *  - $USER->email - The user's email address.
 262  *  - $USER->id - The unique integer identified of this user in the 'user' table.
 263  *  - $USER->email - The user's email address.
 264  *  - $USER->firstname - The user's first name.
 265  *  - $USER->lastname - The user's last name.
 266  *  - $USER->username - The user's login username.
 267  *  - $USER->secret - The user's ?.
 268  *  - $USER->lang - The user's language choice.
 269  *
 270  * @global object $USER
 271  * @name $USER
 272  */
 273 global $USER;
 274
 275 /**
 276  * A central store of information about the current page we are
 277  * generating in response to the user's request.
 278  *
 279  * @global moodle_page $PAGE
 280  * @name $PAGE
 281  */
 282 global $PAGE;
 283
 284 /**
 285  * The current course. An alias for $PAGE->course.
 286  * @global object $COURSE
 287  * @name $COURSE
 288  */
 289 global $COURSE;
 290
 291 /**
 292  * $OUTPUT is an instance of core_renderer or one of its subclasses. Use
 293  * it to generate HTML for output.
 294  *
 295  * $OUTPUT is initialised the first time it is used. See {@link bootstrap_renderer}
 296  * for the magic that does that. After $OUTPUT has been initialised, any attempt
 297  * to change something that affects the current theme ($PAGE->course, logged in use,
 298  * httpsrequried ... will result in an exception.)
 299  *
 300  * Please note the $OUTPUT is replacing the old global $THEME object.
 301  *
 302  * @global object $OUTPUT
 303  * @name $OUTPUT
 304  */
 305 global $OUTPUT;
 306
 307 /**
 308  * Shared memory cache.
 309  * @global object $MCACHE
 310  * @name $MCACHE
 311  */
 312 global $MCACHE;
 313
 314 /**
 315  * Full script path including all params, slash arguments, scheme and host.
 316  * @global string $FULLME
 317  * @name $FULLME
 318  */
 319 global $FULLME;
 320
 321 /**
 322  * Script path including query string and slash arguments without host.
 323  * @global string $ME
 324  * @name $ME
 325  */
 326 global $ME;
 327
 328 /**
 329  * $FULLME without slasharguments and query string.
 330  * @global string $FULLSCRIPT
 331  * @name $FULLSCRIPT
 332  */
 333 global $FULLSCRIPT;
 334
 335 /**
 336  * Relative moodle script path '/course/view.php'
 337  * @global string $SCRIPT
 338  * @name $SCRIPT
 339  */
 340 global $SCRIPT;
 341
 342 // Store settings from config.php in array in $CFG - we can use it later to detect problems and overrides
 343 $CFG->config_php_settings = (array)$CFG;
 344 // Forced plugin settings override values from config_plugins table
 345 unset($CFG->config_php_settings['forced_plugin_settings']);
 346 if (!isset($CFG->forced_plugin_settings)) {
 347     $CFG->forced_plugin_settings = array();
 348 }
 349 // Set httpswwwroot default value (this variable will replace $CFG->wwwroot
 350 // inside some URLs used in HTTPSPAGEREQUIRED pages.
 351 $CFG->httpswwwroot = $CFG->wwwroot;
 352
 353 require_once($CFG->libdir .'/setuplib.php');        // Functions that MUST be loaded first
 354
 355 if (NO_OUTPUT_BUFFERING) {
 356     // we have to call this always before starting session because it discards headers!
 357     disable_output_buffering();
 358 }
 359
 360 // Increase memory limits if possible
 361 raise_memory_limit(MEMORY_STANDARD);
 362
 363 // Time to start counting
 364 init_performance_info();
 365
 366 // Put $OUTPUT in place, so errors can be displayed.
 367 $OUTPUT = new bootstrap_renderer();
 368
 369 // set handler for uncaught exceptions - equivalent to print_error() call
 370 set_exception_handler('default_exception_handler');
 371 set_error_handler('default_error_handler', E_ALL | E_STRICT);
 372
 373 // If there are any errors in the standard libraries we want to know!
 374 error_reporting(E_ALL);
 375
 376 // Just say no to link prefetching (Moz prefetching, Google Web Accelerator, others)
 377 // http://www.google.com/webmasters/faq.html#prefetchblock
 378 if (!empty($_SERVER['HTTP_X_moz']) && $_SERVER['HTTP_X_moz'] === 'prefetch'){
 379     header($_SERVER['SERVER_PROTOCOL'] . ' 404 Prefetch Forbidden');
 380     echo('Prefetch request forbidden.');
 381     exit(1);
 382 }
 383
 384 if (!isset($CFG->prefix)) {   // Just in case it isn't defined in config.php
 385     $CFG->prefix = '';
 386 }
 387
 388 // location of all languages except core English pack
 389 if (!isset($CFG->langotherroot)) {
 390     $CFG->langotherroot = $CFG->dataroot.'/lang';
 391 }
 392
 393 // location of local lang pack customisations (dirs with _local suffix)
 394 if (!isset($CFG->langlocalroot)) {
 395     $CFG->langlocalroot = $CFG->dataroot.'/lang';
 396 }
 397
 398 //point pear include path to moodles lib/pear so that includes and requires will search there for files before anywhere else
 399 //the problem is that we need specific version of quickforms and hacked excel files :-(
 400 ini_set('include_path', $CFG->libdir.'/pear' . PATH_SEPARATOR . ini_get('include_path'));
 401 //point zend include path to moodles lib/zend so that includes and requires will search there for files before anywhere else
 402 //please note zend library is supposed to be used only from web service protocol classes, it may be removed in future
 403 ini_set('include_path', $CFG->libdir.'/zend' . PATH_SEPARATOR . ini_get('include_path'));
 404
 405 // Load up standard libraries
 406 require_once($CFG->libdir .'/textlib.class.php');   // Functions to handle multibyte strings
 407 require_once($CFG->libdir .'/filterlib.php');       // Functions for filtering test as it is output
 408 require_once($CFG->libdir .'/ajax/ajaxlib.php');    // Functions for managing our use of JavaScript and YUI
 409 require_once($CFG->libdir .'/weblib.php');          // Functions relating to HTTP and content
 410 require_once($CFG->libdir .'/outputlib.php');       // Functions for generating output
 411 require_once($CFG->libdir .'/navigationlib.php');   // Class for generating Navigation structure
 412 require_once($CFG->libdir .'/dmllib.php');          // Database access
 413 require_once($CFG->libdir .'/datalib.php');         // Legacy lib with a big-mix of functions.
 414 require_once($CFG->libdir .'/accesslib.php');       // Access control functions
 415 require_once($CFG->libdir .'/deprecatedlib.php');   // Deprecated functions included for backward compatibility
 416 require_once($CFG->libdir .'/moodlelib.php');       // Other general-purpose functions
 417 require_once($CFG->libdir .'/enrollib.php');        // Enrolment related functions
 418 require_once($CFG->libdir .'/pagelib.php');         // Library that defines the moodle_page class, used for $PAGE
 419 require_once($CFG->libdir .'/blocklib.php');        // Library for controlling blocks
 420 require_once($CFG->libdir .'/eventslib.php');       // Events functions
 421 require_once($CFG->libdir .'/grouplib.php');        // Groups functions
 422 require_once($CFG->libdir .'/sessionlib.php');      // All session and cookie related stuff
 423 require_once($CFG->libdir .'/editorlib.php');       // All text editor related functions and classes
 424 require_once($CFG->libdir .'/messagelib.php');      // Messagelib functions
 425 require_once($CFG->libdir .'/modinfolib.php');      // Cached information on course-module instances
 426
 427 // make sure PHP is not severly misconfigured
 428 setup_validate_php_configuration();
 429
 430 // Connect to the database
 431 setup_DB();
 432
 433 // Disable errors for now - needed for installation when debug enabled in config.php
 434 if (isset($CFG->debug)) {
 435     $originalconfigdebug = $CFG->debug;
 436     unset($CFG->debug);
 437 } else {
 438     $originalconfigdebug = -1;
 439 }
 440
 441 // Load up any configuration from the config table
 442 initialise_cfg();
 443
 444 // Verify upgrade is not running unless we are in a script that needs to execute in any case
 445 if (!defined('NO_UPGRADE_CHECK') and isset($CFG->upgraderunning)) {
 446     if ($CFG->upgraderunning < time()) {
 447         unset_config('upgraderunning');
 448     } else {
 449         print_error('upgraderunning');
 450     }
 451 }
 452
 453 // Turn on SQL logging if required
 454 if (!empty($CFG->logsql)) {
 455     $DB->set_logging(true);
 456 }
 457
 458 // Prevent warnings from roles when upgrading with debug on
 459 if (isset($CFG->debug)) {
 460     $originaldatabasedebug = $CFG->debug;
 461     unset($CFG->debug);
 462 } else {
 463     $originaldatabasedebug = -1;
 464 }
 465
 466 // enable circular reference collector in PHP 5.3,
 467 // it helps a lot when using large complex OOP structures such as in amos or gradebook
 468 if (function_exists('gc_enable')) {
 469     gc_enable();
 470 }
 471
 472 // Register default shutdown tasks - such as Apache memory release helper, perf logging, etc.
 473 if (function_exists('register_shutdown_function')) {
 474     register_shutdown_function('moodle_request_shutdown');
 475 }
 476
 477 // Defining the site
 478 try {
 479     $SITE = get_site();
 480     /**
 481      * If $SITE global from {@link get_site()} is set then SITEID to $SITE->id, otherwise set to 1.
 482      */
 483     define('SITEID', $SITE->id);
 484     // And the 'default' course - this will usually get reset later in require_login() etc.
 485     $COURSE = clone($SITE);
 486 } catch (dml_exception $e) {
 487     $SITE = null;
 488     if (empty($CFG->version)) {
 489         // we are just installing
 490         /**
 491          * @ignore
 492          */
 493         define('SITEID', 1);
 494         // And the 'default' course
 495         $COURSE = new stdClass();  // no site created yet
 496         $COURSE->id = 1;
 497     } else {
 498         throw $e;
 499     }
 500 }
 501
 502 // define SYSCONTEXTID in config.php if you want to save some queries (after install or upgrade!)
 503 if (!defined('SYSCONTEXTID')) {
 504     get_system_context();
 505 }
 506
 507 // Set error reporting back to normal
 508 if ($originaldatabasedebug == -1) {
 509     $CFG->debug = DEBUG_MINIMAL;
 510 } else {
 511     $CFG->debug = $originaldatabasedebug;
 512 }
 513 if ($originalconfigdebug !== -1) {
 514     $CFG->debug = $originalconfigdebug;
 515 }
 516 unset($originalconfigdebug);
 517 unset($originaldatabasedebug);
 518 error_reporting($CFG->debug);
 519
 520 // find out if PHP configured to display warnings,
 521 // this is a security problem because some moodle scripts may
 522 // disclose sensitive information
 523 if (ini_get_bool('display_errors')) {
 524     define('WARN_DISPLAY_ERRORS_ENABLED', true);
 525 }
 526 // If we want to display Moodle errors, then try and set PHP errors to match
 527 if (!isset($CFG->debugdisplay)) {
 528     // keep it "as is" during installation
 529 } else if (NO_DEBUG_DISPLAY) {
 530     // some parts of Moodle cannot display errors and debug at all.
 531     ini_set('display_errors', '0');
 532     ini_set('log_errors', '1');
 533 } else if (empty($CFG->debugdisplay)) {
 534     ini_set('display_errors', '0');
 535     ini_set('log_errors', '1');
 536 } else {
 537     // This is very problematic in XHTML strict mode!
 538     ini_set('display_errors', '1');
 539 }
 540
 541 // detect unsupported upgrade jump as soon as possible - do not change anything, do not use system functions
 542 if (!empty($CFG->version) and $CFG->version < 2007101509) {
 543     print_error('upgraderequires19', 'error');
 544     die;
 545 }
 546
 547 // Shared-Memory cache init -- will set $MCACHE
 548 // $MCACHE is a global object that offers at least add(), set() and delete()
 549 // with similar semantics to the memcached PHP API http://php.net/memcache
 550 // Ensure we define rcache - so we can later check for it
 551 // with a really fast and unambiguous $CFG->rcache === false
 552 if (!empty($CFG->cachetype)) {
 553     if (empty($CFG->rcache)) {
 554         $CFG->rcache = false;
 555     } else {
 556         $CFG->rcache = true;
 557     }
 558
 559     // do not try to initialize if cache disabled
 560     if (!$CFG->rcache) {
 561         $CFG->cachetype = '';
 562     }
 563
 564     if ($CFG->cachetype === 'memcached' && !empty($CFG->memcachedhosts)) {
 565         if (!init_memcached()) {
 566             debugging("Error initialising memcached");
 567             $CFG->cachetype = '';
 568             $CFG->rcache = false;
 569         }
 570     } else if ($CFG->cachetype === 'eaccelerator') {
 571         if (!init_eaccelerator()) {
 572             debugging("Error initialising eaccelerator cache");
 573             $CFG->cachetype = '';
 574             $CFG->rcache = false;
 575         }
 576     }
 577
 578 } else { // just make sure it is defined
 579     $CFG->cachetype = '';
 580     $CFG->rcache    = false;
 581 }
 582
 583 // Calculate and set $CFG->ostype to be used everywhere. Possible values are:
 584 // - WINDOWS: for any Windows flavour.
 585 // - UNIX: for the rest
 586 // Also, $CFG->os can continue being used if more specialization is required
 587 if (stristr(PHP_OS, 'win') && !stristr(PHP_OS, 'darwin')) {
 588     $CFG->ostype = 'WINDOWS';
 589 } else {
 590     $CFG->ostype = 'UNIX';
 591 }
 592 $CFG->os = PHP_OS;
 593
 594 // Configure ampersands in URLs
 595 ini_set('arg_separator.output', '&amp;');
 596
 597 // Work around for a PHP bug   see MDL-11237
 598 ini_set('pcre.backtrack_limit', 20971520);  // 20 MB
 599
 600 // Location of standard files
 601 $CFG->wordlist = $CFG->libdir .'/wordlist.txt';
 602 $CFG->moddata  = 'moddata';
 603
 604 // Create the $PAGE global.
 605 if (!empty($CFG->moodlepageclass)) {
 606     $classname = $CFG->moodlepageclass;
 607 } else {
 608     $classname = 'moodle_page';
 609 }
 610 $PAGE = new $classname();
 611 unset($classname);
 612
 613 // A hack to get around magic_quotes_gpc being turned on
 614 // It is strongly recommended to disable "magic_quotes_gpc"!
 615 if (ini_get_bool('magic_quotes_gpc')) {
 616     function stripslashes_deep($value) {
 617         $value = is_array($value) ?
 618                 array_map('stripslashes_deep', $value) :
 619                 stripslashes($value);
 620         return $value;
 621     }
 622     $_POST = array_map('stripslashes_deep', $_POST);
 623     $_GET = array_map('stripslashes_deep', $_GET);
 624     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 625     $_REQUEST = array_map('stripslashes_deep', $_REQUEST);
 626     if (!empty($_SERVER['REQUEST_URI'])) {
 627         $_SERVER['REQUEST_URI'] = stripslashes($_SERVER['REQUEST_URI']);
 628     }
 629     if (!empty($_SERVER['QUERY_STRING'])) {
 630         $_SERVER['QUERY_STRING'] = stripslashes($_SERVER['QUERY_STRING']);
 631     }
 632     if (!empty($_SERVER['HTTP_REFERER'])) {
 633         $_SERVER['HTTP_REFERER'] = stripslashes($_SERVER['HTTP_REFERER']);
 634     }
 635    if (!empty($_SERVER['PATH_INFO'])) {
 636         $_SERVER['PATH_INFO'] = stripslashes($_SERVER['PATH_INFO']);
 637     }
 638     if (!empty($_SERVER['PHP_SELF'])) {
 639         $_SERVER['PHP_SELF'] = stripslashes($_SERVER['PHP_SELF']);
 640     }
 641     if (!empty($_SERVER['PATH_TRANSLATED'])) {
 642         $_SERVER['PATH_TRANSLATED'] = stripslashes($_SERVER['PATH_TRANSLATED']);
 643     }
 644 }
 645
 646 // neutralise nasty chars in PHP_SELF
 647 if (isset($_SERVER['PHP_SELF'])) {
 648     $phppos = strpos($_SERVER['PHP_SELF'], '.php');
 649     if ($phppos !== false) {
 650         $_SERVER['PHP_SELF'] = substr($_SERVER['PHP_SELF'], 0, $phppos+4);
 651     }
 652     unset($phppos);
 653 }
 654
 655 // initialise ME's
 656 initialise_fullme();
 657
 658 // init session prevention flag - this is defined on pages that do not want session
 659 if (CLI_SCRIPT) {
 660     // no sessions in CLI scripts possible
 661     define('NO_MOODLE_COOKIES', true);
 662
 663 } else if (!defined('NO_MOODLE_COOKIES')) {
 664     if (empty($CFG->version) or $CFG->version < 2009011900) {
 665         // no session before sessions table gets created
 666         define('NO_MOODLE_COOKIES', true);
 667     } else if (CLI_SCRIPT) {
 668         // CLI scripts can not have session
 669         define('NO_MOODLE_COOKIES', true);
 670     } else {
 671         define('NO_MOODLE_COOKIES', false);
 672     }
 673 }
 674
 675 // start session and prepare global $SESSION, $USER
 676 session_get_instance();
 677 $SESSION = &$_SESSION['SESSION'];
 678 $USER    = &$_SESSION['USER'];
 679
 680 // Late profiling, only happening if early one wasn't started
 681 if (!empty($CFG->profilingenabled)) {
 682     require_once($CFG->libdir . '/xhprof/xhprof_moodle.php');
 683     if (profiling_start()) {
 684         register_shutdown_function('profiling_stop');
 685     }
 686 }
 687
 688 // Process theme change in the URL.
 689 if (!empty($CFG->allowthemechangeonurl) and !empty($_GET['theme'])) {
 690     // we have to use _GET directly because we do not want this to interfere with _POST
 691     $urlthemename = optional_param('theme', '', PARAM_SAFEDIR);
 692     try {
 693         $themeconfig = theme_config::load($urlthemename);
 694         // Makes sure the theme can be loaded without errors.
 695         if ($themeconfig->name === $urlthemename) {
 696             $SESSION->theme = $urlthemename;
 697         } else {
 698             unset($SESSION->theme);
 699         }
 700         unset($themeconfig);
 701         unset($urlthemename);
 702     } catch (Exception $e) {
 703         debugging('Failed to set the theme from the URL.', DEBUG_DEVELOPER, $e->getTrace());
 704     }
 705 }
 706 unset($urlthemename);
 707
 708 // Ensure a valid theme is set.
 709 if (!isset($CFG->theme)) {
 710     $CFG->theme = 'standardwhite';
 711 }
 712
 713 // Set language/locale of printed times.  If user has chosen a language that
 714 // that is different from the site language, then use the locale specified
 715 // in the language file.  Otherwise, if the admin hasn't specified a locale
 716 // then use the one from the default language.  Otherwise (and this is the
 717 // majority of cases), use the stored locale specified by admin.
 718 // note: do not accept lang parameter from POST
 719 if (isset($_GET['lang']) and ($lang = optional_param('lang', '', PARAM_SAFEDIR))) {
 720     if (get_string_manager()->translation_exists($lang, false)) {
 721         $SESSION->lang = $lang;
 722     }
 723 }
 724 unset($lang);
 725
 726 setup_lang_from_browser();
 727
 728 if (empty($CFG->lang)) {
 729     if (empty($SESSION->lang)) {
 730         $CFG->lang = 'en';
 731     } else {
 732         $CFG->lang = $SESSION->lang;
 733     }
 734 }
 735
 736 // Set the default site locale, a lot of the stuff may depend on this
 737 // it is definitely too late to call this first in require_login()!
 738 moodle_setlocale();
 739
 740 if (!empty($CFG->debugvalidators) and !empty($CFG->guestloginbutton)) {
 741     if ($CFG->theme == 'standard' or $CFG->theme == 'standardwhite') {    // Temporary measure to help with XHTML validation
 742         if (isset($_SERVER['HTTP_USER_AGENT']) and empty($USER->id)) {      // Allow W3CValidator in as user called w3cvalidator (or guest)
 743             if ((strpos($_SERVER['HTTP_USER_AGENT'], 'W3C_Validator') !== false) or
 744                 (strpos($_SERVER['HTTP_USER_AGENT'], 'Cynthia') !== false )) {
 745                 if ($user = get_complete_user_data("username", "w3cvalidator")) {
 746                     $user->ignoresesskey = true;
 747                 } else {
 748                     $user = guest_user();
 749                 }
 750                 session_set_user($user);
 751             }
 752         }
 753     }
 754 }
 755
 756 // Apache log integration. In apache conf file one can use ${MOODULEUSER}n in
 757 // LogFormat to get the current logged in username in moodle.
 758 if ($USER && function_exists('apache_note')
 759     && !empty($CFG->apacheloguser) && isset($USER->username)) {
 760     $apachelog_userid = $USER->id;
 761     $apachelog_username = clean_filename($USER->username);
 762     $apachelog_name = '';
 763     if (isset($USER->firstname)) {
 764         // We can assume both will be set
 765         // - even if to empty.
 766         $apachelog_name = clean_filename($USER->firstname . " " .
 767                                          $USER->lastname);
 768     }
 769     if (session_is_loggedinas()) {
 770         $realuser = session_get_realuser();
 771         $apachelog_username = clean_filename($realuser->username." as ".$apachelog_username);
 772         $apachelog_name = clean_filename($realuser->firstname." ".$realuser->lastname ." as ".$apachelog_name);
 773         $apachelog_userid = clean_filename($realuser->id." as ".$apachelog_userid);
 774     }
 775     switch ($CFG->apacheloguser) {
 776         case 3:
 777             $logname = $apachelog_username;
 778             break;
 779         case 2:
 780             $logname = $apachelog_name;
 781             break;
 782         case 1:
 783         default:
 784             $logname = $apachelog_userid;
 785             break;
 786     }
 787     apache_note('MOODLEUSER', $logname);
 788 }
 789
 790 // Adjust ALLOWED_TAGS
 791 adjust_allowed_tags();
 792
 793 // Use a custom script replacement if one exists
 794 if (!empty($CFG->customscripts)) {
 795     if (($customscript = custom_script_path()) !== false) {
 796         require ($customscript);
 797     }
 798 }
 799
 800 // in the first case, ip in allowed list will be performed first
 801 // for example, client IP is 192.168.1.1
 802 // 192.168 subnet is an entry in allowed list
 803 // 192.168.1.1 is banned in blocked list
 804 // This ip will be banned finally
 805 if (!empty($CFG->allowbeforeblock)) { // allowed list processed before blocked list?
 806     if (!empty($CFG->allowedip)) {
 807         if (!remoteip_in_list($CFG->allowedip)) {
 808             die(get_string('ipblocked', 'admin'));
 809         }
 810     }
 811     // need further check, client ip may a part of
 812     // allowed subnet, but a IP address are listed
 813     // in blocked list.
 814     if (!empty($CFG->blockedip)) {
 815         if (remoteip_in_list($CFG->blockedip)) {
 816             die(get_string('ipblocked', 'admin'));
 817         }
 818     }
 819
 820 } else {
 821     // in this case, IPs in blocked list will be performed first
 822     // for example, client IP is 192.168.1.1
 823     // 192.168 subnet is an entry in blocked list
 824     // 192.168.1.1 is allowed in allowed list
 825     // This ip will be allowed finally
 826     if (!empty($CFG->blockedip)) {
 827         if (remoteip_in_list($CFG->blockedip)) {
 828             // if the allowed ip list is not empty
 829             // IPs are not included in the allowed list will be
 830             // blocked too
 831             if (!empty($CFG->allowedip)) {
 832                 if (!remoteip_in_list($CFG->allowedip)) {
 833                     die(get_string('ipblocked', 'admin'));
 834                 }
 835             } else {
 836                 die(get_string('ipblocked', 'admin'));
 837             }
 838         }
 839     }
 840     // if blocked list is null
 841     // allowed list should be tested
 842     if(!empty($CFG->allowedip)) {
 843         if (!remoteip_in_list($CFG->allowedip)) {
 844             die(get_string('ipblocked', 'admin'));
 845         }
 846     }
 847
 848 }
 849
 850 // note: we can not block non utf-8 installations here, because empty mysql database
 851 // might be converted to utf-8 in admin/index.php during installation
 852
 853
 854
 855 // this is a funny trick to make Eclipse believe that $OUTPUT and other globals
 856 // contains an instance of core_renderer, etc. which in turn fixes autocompletion ;-)
 857 if (false) {
 858     $DB = new moodle_database();
 859     $OUTPUT = new core_renderer(null, null);
 860     $PAGE = new moodle_page();
 861 }