phpBB/download/file.php

   1 <?php
   2 /**
   3 *
   4 * @package phpBB3
   5 * @version $Id$
   6 * @copyright (c) 2005 phpBB Group
   7 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
   8 *
   9 */
  10
  11 /**
  12 * @ignore
  13 */
  14 define('IN_PHPBB', true);
  15 if (!defined('PHPBB_ROOT_PATH')) define('PHPBB_ROOT_PATH', './../');
  16 if (!defined('PHP_EXT')) define('PHP_EXT', substr(strrchr(__FILE__, '.'), 1));
  17 include(PHPBB_ROOT_PATH . 'includes/core/bootstrap.' . PHP_EXT);
  18
  19 // Thank you sun.
  20 if (isset($_SERVER['CONTENT_TYPE']))
  21 {
  22         if ($_SERVER['CONTENT_TYPE'] === 'application/x-java-archive')
  23         {
  24                 exit;
  25         }
  26 }
  27 else if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], 'Java') !== false)
  28 {
  29         exit;
  30 }
  31
  32 if (phpbb_request::is_set('avatar', phpbb_request::GET))
  33 {
  34         // worst-case default
  35         $browser = (!empty($_SERVER['HTTP_USER_AGENT'])) ? htmlspecialchars((string) $_SERVER['HTTP_USER_AGENT']) : 'msie 6.0';
  36
  37         phpbb::$config = phpbb_cache::obtain_config();
  38         $filename = phpbb_request::variable('avatar', '', false, phpbb_request::GET);
  39         $avatar_group = false;
  40         $exit = false;
  41
  42         if ($filename[0] === 'g')
  43         {
  44                 $avatar_group = true;
  45                 $filename = substr($filename, 1);
  46         }
  47
  48         // '==' is not a bug - . as the first char is as bad as no dot at all
  49         if (strpos($filename, '.') == false)
  50         {
  51                 header('HTTP/1.0 403 forbidden');
  52                 $exit = true;
  53         }
  54
  55         if (!$exit)
  56         {
  57                 $ext            = substr(strrchr($filename, '.'), 1);
  58                 $stamp          = (int) substr(stristr($filename, '_'), 1);
  59                 $filename       = (int) $filename;
  60                 $exit = set_modified_headers($stamp, $browser);
  61         }
  62         if (!$exit && !in_array($ext, array('png', 'gif', 'jpg', 'jpeg')))
  63         {
  64                 // no way such an avatar could exist. They are not following the rules, stop the show.
  65                 header("HTTP/1.0 403 Forbidden");
  66                 $exit = true;
  67         }
  68
  69
  70         if (!$exit)
  71         {
  72                 if (!$filename)
  73                 {
  74                         // no way such an avatar could exist. They are not following the rules, stop the show.
  75                         header("HTTP/1.0 403 Forbidden");
  76                 }
  77                 else
  78                 {
  79                         send_avatar_to_browser(($avatar_group ? 'g' : '') . $filename . '.' . $ext, $browser);
  80                 }
  81         }
  82         file_gc();
  83 }
  84
  85 // implicit else: we are not in avatar mode
  86 $download_id = request_var('id', 0);
  87 $mode = request_var('mode', '');
  88 $thumbnail = request_var('t', false);
  89
  90 // Start session management, do not update session page.
  91 phpbb::$user->session_begin(false);
  92 phpbb::$acl->init(phpbb::$user->data);
  93 phpbb::$user->setup('viewtopic');
  94
  95 if (!$download_id)
  96 {
  97         trigger_error('NO_ATTACHMENT_SELECTED');
  98 }
  99
 100 if (!phpbb::$config['allow_attachments'] && !phpbb::$config['allow_pm_attach'])
 101 {
 102         trigger_error('ATTACHMENT_FUNCTIONALITY_DISABLED');
 103 }
 104
 105 $sql = 'SELECT attach_id, in_message, post_msg_id, extension, is_orphan, poster_id, filetime
 106         FROM ' . ATTACHMENTS_TABLE . "
 107         WHERE attach_id = $download_id";
 108 $result = $db->sql_query_limit($sql, 1);
 109 $attachment = $db->sql_fetchrow($result);
 110 phpbb::$db->sql_freeresult($result);
 111
 112 if (!$attachment)
 113 {
 114         trigger_error('ERROR_NO_ATTACHMENT');
 115 }
 116
 117 if ((!$attachment['in_message'] && !phpbb::$config['allow_attachments']) || ($attachment['in_message'] && !phpbb::$config['allow_pm_attach']))
 118 {
 119         trigger_error('ATTACHMENT_FUNCTIONALITY_DISABLED');
 120 }
 121
 122 $row = array();
 123
 124 if ($attachment['is_orphan'])
 125 {
 126         // We allow admins having attachment permissions to see orphan attachments...
 127         $own_attachment = (phpbb::$acl->acl_get('a_attach') || $attachment['poster_id'] == phpbb::$user->data['user_id']) ? true : false;
 128
 129         if (!$own_attachment || ($attachment['in_message'] && !phpbb::$acl->acl_get('u_pm_download')) || (!$attachment['in_message'] && !phpbb::$acl->acl_get('u_download')))
 130         {
 131                 trigger_error('ERROR_NO_ATTACHMENT');
 132         }
 133
 134         // Obtain all extensions...
 135         $extensions = phpbb_cache::obtain_extensions();
 136 }
 137 else
 138 {
 139         if (!$attachment['in_message'])
 140         {
 141                 //
 142                 $sql = 'SELECT p.forum_id, f.forum_password, f.parent_id
 143                         FROM ' . POSTS_TABLE . ' p, ' . FORUMS_TABLE . ' f
 144                         WHERE p.post_id = ' . $attachment['post_msg_id'] . '
 145                                 AND p.forum_id = f.forum_id';
 146                 $result = $db->sql_query_limit($sql, 1);
 147                 $row = $db->sql_fetchrow($result);
 148                 $db->sql_freeresult($result);
 149
 150                 // Global announcement?
 151                 $f_download = (!$row) ? phpbb::$acl->acl_getf_global('f_download') : phpbb::$acl->acl_get('f_download', $row['forum_id']);
 152
 153                 if (phpbb::$acl->acl_get('u_download') && $f_download)
 154                 {
 155                         if ($row && $row['forum_password'])
 156                         {
 157                                 // Do something else ... ?
 158                                 login_forum_box($row);
 159                         }
 160                 }
 161                 else
 162                 {
 163                         trigger_error('SORRY_AUTH_VIEW_ATTACH');
 164                 }
 165         }
 166         else
 167         {
 168                 $row['forum_id'] = false;
 169                 if (!phpbb::$acl->acl_get('u_pm_download'))
 170                 {
 171                         header('HTTP/1.0 403 forbidden');
 172                         trigger_error('SORRY_AUTH_VIEW_ATTACH');
 173                 }
 174
 175                 // Check if the attachment is within the users scope...
 176                 $sql = 'SELECT user_id, author_id
 177                         FROM ' . PRIVMSGS_TO_TABLE . '
 178                         WHERE msg_id = ' . $attachment['post_msg_id'];
 179                 $result = $db->sql_query($sql);
 180
 181                 $allowed = false;
 182                 while ($user_row = $db->sql_fetchrow($result))
 183                 {
 184                         if (phpbb::$user->data['user_id'] == $user_row['user_id'] || phpbb::$user->data['user_id'] == $user_row['author_id'])
 185                         {
 186                                 $allowed = true;
 187                                 break;
 188                         }
 189                 }
 190                 $db->sql_freeresult($result);
 191
 192                 if (!$allowed)
 193                 {
 194                         header('HTTP/1.0 403 forbidden');
 195                         trigger_error('ERROR_NO_ATTACHMENT');
 196                 }
 197         }
 198
 199         // disallowed?
 200         $extensions = array();
 201         if (!extension_allowed($row['forum_id'], $attachment['extension'], $extensions))
 202         {
 203                 trigger_error(sprintf(phpbb::$user->lang['EXTENSION_DISABLED_AFTER_POSTING'], $attachment['extension']));
 204         }
 205 }
 206
 207 if (!download_allowed())
 208 {
 209         header('HTTP/1.0 403 forbidden');
 210         trigger_error(phpbb::$user->lang['LINKAGE_FORBIDDEN']);
 211 }
 212
 213 $download_mode = (int) $extensions[$attachment['extension']]['download_mode'];
 214
 215 // Fetching filename here to prevent sniffing of filename
 216 $sql = 'SELECT attach_id, is_orphan, in_message, post_msg_id, extension, physical_filename, real_filename, mimetype, filetime
 217         FROM ' . ATTACHMENTS_TABLE . "
 218         WHERE attach_id = $download_id";
 219 $result = $db->sql_query_limit($sql, 1);
 220 $attachment = $db->sql_fetchrow($result);
 221 phpbb::$db->sql_freeresult($result);
 222
 223 if (!$attachment)
 224 {
 225         trigger_error('ERROR_NO_ATTACHMENT');
 226 }
 227
 228 $attachment['physical_filename'] = basename($attachment['physical_filename']);
 229 $display_cat = $extensions[$attachment['extension']]['display_cat'];
 230
 231 if (($display_cat == ATTACHMENT_CATEGORY_IMAGE || $display_cat == ATTACHMENT_CATEGORY_THUMB) && !phpbb::$user->optionget('viewimg'))
 232 {
 233         $display_cat = ATTACHMENT_CATEGORY_NONE;
 234 }
 235
 236 if ($display_cat == ATTACHMENT_CATEGORY_FLASH && !phpbb::$user->optionget('viewflash'))
 237 {
 238         $display_cat = ATTACHMENT_CATEGORY_NONE;
 239 }
 240
 241 if ($thumbnail)
 242 {
 243         $attachment['physical_filename'] = 'thumb_' . $attachment['physical_filename'];
 244 }
 245 else if (($display_cat == ATTACHMENT_CATEGORY_NONE || $display_cat == ATTACHMENT_CATEGORY_IMAGE) && !$attachment['is_orphan'])
 246 {
 247         // Update download count
 248         $sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
 249                 SET download_count = download_count + 1
 250                 WHERE attach_id = ' . $attachment['attach_id'];
 251         $db->sql_query($sql);
 252 }
 253
 254 if ($display_cat == ATTACHMENT_CATEGORY_IMAGE && $mode === 'view' && (strpos($attachment['mimetype'], 'image') === 0) && ((strpos(strtolower(phpbb::$user->system['browser']), 'msie') !== false) && (strpos(strtolower(phpbb::$user->system['browser']), 'msie 8.0') === false)))
 255 {
 256         wrap_img_in_html(append_sid('download/file', 'id=' . $attachment['attach_id']), $attachment['real_filename']);
 257 }
 258 else
 259 {
 260         // Determine the 'presenting'-method
 261         if ($download_mode == PHYSICAL_LINK)
 262         {
 263                 // This presenting method should no longer be used
 264                 if (!@is_dir(PHPBB_ROOT_PATH . phpbb::$config['upload_path']))
 265                 {
 266                         trigger_error(phpbb::$user->lang['PHYSICAL_DOWNLOAD_NOT_POSSIBLE']);
 267                 }
 268
 269                 redirect(PHPBB_ROOT_PATH . phpbb::$config['upload_path'] . '/' . $attachment['physical_filename']);
 270                 file_gc();
 271         }
 272         else
 273         {
 274                 send_file_to_browser($attachment, phpbb::$config['upload_path'], $display_cat);
 275                 file_gc();
 276         }
 277 }
 278
 279
 280 /**
 281 * A simplified function to deliver avatars
 282 * The argument needs to be checked before calling this function.
 283 */
 284 function send_avatar_to_browser($file, $browser)
 285 {
 286         $prefix = phpbb::$config['avatar_salt'] . '_';
 287         $image_dir = phpbb::$config['avatar_path'];
 288
 289         // Adjust image_dir path (no trailing slash)
 290         if (substr($image_dir, -1, 1) == '/' || substr($image_dir, -1, 1) == '\\')
 291         {
 292                 $image_dir = substr($image_dir, 0, -1) . '/';
 293         }
 294         $image_dir = str_replace(array('../', '..\\', './', '.\\'), '', $image_dir);
 295
 296         if ($image_dir && ($image_dir[0] == '/' || $image_dir[0] == '\\'))
 297         {
 298                 $image_dir = '';
 299         }
 300         $file_path = PHPBB_ROOT_PATH . $image_dir . '/' . $prefix . $file;
 301
 302         if ((@file_exists($file_path) && @is_readable($file_path)) && !headers_sent())
 303         {
 304                 header('Pragma: public');
 305
 306                 $image_data = @getimagesize($file_path);
 307                 header('Content-Type: ' . image_type_to_mime_type($image_data[2]));
 308
 309                 if (strpos(strtolower($browser), 'msie') !== false && strpos(strtolower($browser), 'msie 8.0') === false)
 310                 {
 311                         header('Content-Disposition: attachment; ' . header_filename($file));
 312
 313                         if (strpos(strtolower($browser), 'msie 6.0') !== false)
 314                         {
 315                                 header('Expires: -1');
 316                         }
 317                         else
 318                         {
 319                                 header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
 320                         }
 321                 }
 322                 else
 323                 {
 324                         header('Content-Disposition: inline; ' . header_filename($file));
 325                         header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
 326                 }
 327
 328                 $size = @filesize($file_path);
 329                 if ($size)
 330                 {
 331                         header("Content-Length: $size");
 332                 }
 333
 334                 if (@readfile($file_path) == false)
 335                 {
 336                         $fp = @fopen($file_path, 'rb');
 337
 338                         if ($fp !== false)
 339                         {
 340                                 while (!feof($fp))
 341                                 {
 342                                         echo fread($fp, 8192);
 343                                 }
 344                                 fclose($fp);
 345                         }
 346                 }
 347
 348                 flush();
 349         }
 350         else
 351         {
 352                 header('HTTP/1.0 404 not found');
 353         }
 354 }
 355
 356 /**
 357 * Wraps an url into a simple html page. Used to display attachments in IE.
 358 * this is a workaround for now; might be moved to template system later
 359 * direct any complaints to 1 Microsoft Way, Redmond
 360 */
 361 function wrap_img_in_html($src, $title)
 362 {
 363         echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-Strict.dtd">';
 364         echo '<html>';
 365         echo '<head>';
 366         echo '<meta http-equiv="content-type" content="text/html; charset=UTF-8" />';
 367         echo '<title>' . $title . '</title>';
 368         echo '</head>';
 369         echo '<body>';
 370         echo '<div>';
 371         echo '<img src="' . $src . '" alt="' . $title . '" />';
 372         echo '</div>';
 373         echo '</body>';
 374         echo '</html>';
 375 }
 376
 377 /**
 378 * Send file to browser
 379 */
 380 function send_file_to_browser($attachment, $upload_dir, $category)
 381 {
 382         $filename = PHPBB_ROOT_PATH . $upload_dir . '/' . $attachment['physical_filename'];
 383
 384         if (!@file_exists($filename))
 385         {
 386                 trigger_error(phpbb::$user->lang['ERROR_NO_ATTACHMENT'] . '<br /><br />' . sprintf(phpbb::$user->lang['FILE_NOT_FOUND_404'], $filename));
 387         }
 388
 389         // Correct the mime type - we force application/octetstream for all files, except images
 390         // Please do not change this, it is a security precaution
 391         if ($category != ATTACHMENT_CATEGORY_IMAGE || strpos($attachment['mimetype'], 'image') !== 0)
 392         {
 393                 $attachment['mimetype'] = (strpos(strtolower(phpbb::$user->system['browser']), 'msie') !== false || strpos(strtolower(phpbb::$user->system['browser']), 'opera') !== false) ? 'application/octetstream' : 'application/octet-stream';
 394         }
 395
 396         if (@ob_get_length())
 397         {
 398                 @ob_end_clean();
 399         }
 400
 401         // Now send the File Contents to the Browser
 402         $size = @filesize($filename);
 403
 404         // To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
 405
 406         // Check if headers already sent or not able to get the file contents.
 407         if (headers_sent() || !@file_exists($filename) || !@is_readable($filename))
 408         {
 409                 // PHP track_errors setting On?
 410                 if (!empty($php_errormsg))
 411                 {
 412                         trigger_error(phpbb::$user->lang['UNABLE_TO_DELIVER_FILE'] . '<br />' . sprintf(phpbb::$user->lang['TRACKED_PHP_ERROR'], $php_errormsg));
 413                 }
 414
 415                 trigger_error('UNABLE_TO_DELIVER_FILE');
 416         }
 417
 418         // Now the tricky part... let's dance
 419         header('Pragma: public');
 420
 421         /**
 422         * Commented out X-Sendfile support. To not expose the physical filename within the header if xsendfile is absent we need to look into methods of checking it's status.
 423         *
 424         * Try X-Sendfile since it is much more server friendly - only works if the path is *not* outside of the root path...
 425         * lighttpd has core support for it. An apache2 module is available at http://celebnamer.celebworld.ws/stuff/mod_xsendfile/
 426         *
 427         * Not really ideal, but should work fine...
 428         * <code>
 429         *       if (strpos($upload_dir, '/') !== 0 && strpos($upload_dir, '../') === false)
 430         *       {
 431         *               header('X-Sendfile: ' . $filename);
 432         *       }
 433         * </code>
 434         */
 435
 436         // Send out the Headers. Do not set Content-Disposition to inline please, it is a security measure for users using the Internet Explorer.
 437         $is_ie8 = (strpos(strtolower(phpbb::$user->system['browser']), 'msie 8.0') !== false);
 438         header('Content-Type: ' . $attachment['mimetype'] . (($is_ie8) ? '; authoritative=true;' : ''));
 439
 440         if (empty(phpbb::$user->system['browser']) || (!$is_ie8 && (strpos(strtolower(phpbb::$user->system['browser']), 'msie') !== false)))
 441         {
 442                 header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
 443                 if (empty(phpbb::$user->system['browser']) || (strpos(strtolower(phpbb::$user->system['browser']), 'msie 6.0') !== false))
 444                 {
 445                         header('expires: -1');
 446                 }
 447         }
 448         else
 449         {
 450                 header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
 451                 if ($is_ie8 && (strpos($attachment['mimetype'], 'image') !== 0))
 452                 {
 453                         header('X-Download-Options: noopen');
 454                 }
 455         }
 456
 457         if ($size)
 458         {
 459                 header("Content-Length: $size");
 460         }
 461
 462         // Close the db connection before sending the file
 463         $db->sql_close();
 464
 465         if (!set_modified_headers($attachment['filetime'], phpbb::$user->system['browser']))
 466         {
 467                 // Try to deliver in chunks
 468                 @set_time_limit(0);
 469
 470                 $fp = @fopen($filename, 'rb');
 471
 472                 if ($fp !== false)
 473                 {
 474                         while (!feof($fp))
 475                         {
 476                                 echo fread($fp, 8192);
 477                         }
 478                         fclose($fp);
 479                 }
 480                 else
 481                 {
 482                         @readfile($filename);
 483                 }
 484
 485                 flush();
 486         }
 487         file_gc();
 488 }
 489
 490 /**
 491 * Get a browser friendly UTF-8 encoded filename
 492 */
 493 function header_filename($file)
 494 {
 495         $user_agent = (!empty($_SERVER['HTTP_USER_AGENT'])) ? htmlspecialchars((string) $_SERVER['HTTP_USER_AGENT']) : '';
 496
 497         // There be dragons here.
 498         // Not many follows the RFC...
 499         if (strpos($user_agent, 'MSIE') !== false || strpos($user_agent, 'Safari') !== false || strpos($user_agent, 'Konqueror') !== false)
 500         {
 501                 return "filename=" . rawurlencode($file);
 502         }
 503
 504         // follow the RFC for extended filename for the rest
 505         return "filename*=UTF-8''" . rawurlencode($file);
 506 }
 507
 508 /**
 509 * Check if downloading item is allowed
 510 */
 511 function download_allowed()
 512 {
 513         if (!phpbb::$config['secure_downloads'])
 514         {
 515                 return true;
 516         }
 517
 518         $url = (!empty($_SERVER['HTTP_REFERER'])) ? trim($_SERVER['HTTP_REFERER']) : trim(getenv('HTTP_REFERER'));
 519
 520         if (!$url)
 521         {
 522                 return (phpbb::$config['secure_allow_empty_referer']) ? true : false;
 523         }
 524
 525         // Split URL into domain and script part
 526         $url = @parse_url($url);
 527
 528         if ($url === false)
 529         {
 530                 return (phpbb::$config['secure_allow_empty_referer']) ? true : false;
 531         }
 532
 533         $hostname = $url['host'];
 534         unset($url);
 535
 536         $allowed = (phpbb::$config['secure_allow_deny']) ? false : true;
 537         $iplist = array();
 538
 539         if (($ip_ary = @gethostbynamel($hostname)) !== false)
 540         {
 541                 foreach ($ip_ary as $ip)
 542                 {
 543                         if ($ip)
 544                         {
 545                                 $iplist[] = $ip;
 546                         }
 547                 }
 548         }
 549
 550         // Check for own server...
 551         $server_name = phpbb::$user->system['host'];
 552
 553         // Forcing server vars is the only way to specify/override the protocol
 554         if (phpbb::$config['force_server_vars'] || !$server_name)
 555         {
 556                 $server_name = phpbb::$config['server_name'];
 557         }
 558
 559         if (preg_match('#^.*?' . preg_quote($server_name, '#') . '.*?$#i', $hostname))
 560         {
 561                 $allowed = true;
 562         }
 563
 564         // Get IP's and Hostnames
 565         if (!$allowed)
 566         {
 567                 $sql = 'SELECT site_ip, site_hostname, ip_exclude
 568                         FROM ' . SITELIST_TABLE;
 569                 $result = $db->sql_query($sql);
 570
 571                 while ($row = $db->sql_fetchrow($result))
 572                 {
 573                         $site_ip = trim($row['site_ip']);
 574                         $site_hostname = trim($row['site_hostname']);
 575
 576                         if ($site_ip)
 577                         {
 578                                 foreach ($iplist as $ip)
 579                                 {
 580                                         if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_ip, '#')) . '$#i', $ip))
 581                                         {
 582                                                 if ($row['ip_exclude'])
 583                                                 {
 584                                                         $allowed = (phpbb::$config['secure_allow_deny']) ? false : true;
 585                                                         break 2;
 586                                                 }
 587                                                 else
 588                                                 {
 589                                                         $allowed = (phpbb::$config['secure_allow_deny']) ? true : false;
 590                                                 }
 591                                         }
 592                                 }
 593                         }
 594
 595                         if ($site_hostname)
 596                         {
 597                                 if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_hostname, '#')) . '$#i', $hostname))
 598                                 {
 599                                         if ($row['ip_exclude'])
 600                                         {
 601                                                 $allowed = (phpbb::$config['secure_allow_deny']) ? false : true;
 602                                                 break;
 603                                         }
 604                                         else
 605                                         {
 606                                                 $allowed = (phpbb::$config['secure_allow_deny']) ? true : false;
 607                                         }
 608                                 }
 609                         }
 610                 }
 611                 $db->sql_freeresult($result);
 612         }
 613
 614         return $allowed;
 615 }
 616
 617 /**
 618 * Check if the browser has the file already and set the appropriate headers-
 619 * @returns false if a resend is in order.
 620 */
 621 function set_modified_headers($stamp, $browser)
 622 {
 623         // let's see if we have to send the file at all
 624         $last_load      =  isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? strtotime(trim($_SERVER['HTTP_IF_MODIFIED_SINCE'])) : false;
 625         if ((strpos(strtolower($browser), 'msie 6.0') === false) && (strpos(strtolower($browser), 'msie 8.0') === false))
 626         {
 627                 if ($last_load !== false && $last_load <= $stamp)
 628                 {
 629                         if (@php_sapi_name() === 'CGI')
 630                         {
 631                                 header('Status: 304 Not Modified', true, 304);
 632                         }
 633                         else
 634                         {
 635                                 header('HTTP/1.0 304 Not Modified', true, 304);
 636                         }
 637                         // seems that we need those too ... browsers
 638                         header('Pragma: public');
 639                         header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
 640                         return true;
 641                 }
 642                 else
 643                 {
 644                         header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $stamp) . ' GMT');
 645                 }
 646         }
 647         return false;
 648 }
 649
 650 function file_gc()
 651 {
 652         if (phpbb::registered('acm'))
 653         {
 654                 phpbb::$acm->unload();
 655         }
 656
 657         if (phpbb::registered('db'))
 658         {
 659                 phpbb::$db->sql_close();
 660         }
 661
 662         exit;
 663 }
 664
 665 ?>