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<?php
/*
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2006 Bharat Mediratta
*
* 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; either version 2 of the License, or (at
* your option) any later version.
*
* 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id: session.php 13338 2006-03-27 15:32:14Z jenst $
*/
?>
<?php
/*
* PHP 4.0.1pl2 introduces a bug where you can't unserialize a
* stdClass instance correctly. So create a dummy class to hold all
* of our session data.
*/
class GallerySession {}
/*
* Turn on cookie support, if possible. Don't complain on errors, in case
* safe mode has disabled this call.
*/
@ini_set('session.use_cookies', 1);
/* If using PHP < 4.3.2, create our own session_regenerate_id() function */
if (!function_exists('session_regenerate_id')) {
function make_seed() {
list($usec, $sec) = explode(' ', microtime());
return (float)$sec + ((float)$usec * 100000);
}
function php_combined_lcg() {
mt_srand(make_seed());
$tv = gettimeofday();
$lcg['s1'] = $tv['sec'] ^ (~$tv['usec']);
$lcg['s2'] = mt_rand();
$q = (int) ($lcg['s1'] / 53668);
$lcg['s1'] = (int) (40014 * ($lcg['s1'] - 53668 * $q) - 12211 * $q);
if ($lcg['s1'] < 0) {
$lcg['s1'] += 2147483563;
}
$q = (int) ($lcg['s2'] / 52774);
$lcg['s2'] = (int) (40692 * ($lcg['s2'] - 52774 * $q) - 3791 * $q);
if ($lcg['s2'] < 0) {
$lcg['s2'] += 2147483399;
}
$z = (int) ($lcg['s1'] - $lcg['s2']);
if ($z < 1) {
$z += 2147483562;
}
return $z * 4.656613e-10;
}
function session_regenerate_id() {
$tv = gettimeofday();
$buf = sprintf("%.15s%ld%ld%0.8f", $_SERVER['REMOTE_ADDR'], $tv['sec'], $tv['usec'], php_combined_lcg() * 10);
session_id(md5($buf));
if (ini_get('session.use_cookies')) {
setcookie(session_name(), session_id(), NULL, '/');
}
return TRUE;
}
}
function destroyGallerySession() {
// Unset all of the session variables.
$_SESSION = array();
// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (isset($_COOKIE[session_name()])) {
setcookie(session_name(), '', time() - 42000, '/');
}
// Finally, destroy the session.
session_destroy();
}
function createGallerySession($newSession = false) {
global $gallery;
if (!session_id()) {
/*
* If no session has been created, set our session cookie name
*/
session_name('GallerySession');
$useStdClass = false;
} else {
/*
* The session is being created externally. This means that if
* we store our data in a GallerySession class, we won't be able
* to deserialize it (because it's not being defined before the
* external session starts). So, we'll have to fall back on using
* stdClass() which will cause problems on older PHP4 servers.
* oh well.
*/
$useStdClass = true;
}
/* Start a new session, or resume our current one */
@session_start();
// If we're requesting a new session, generate a new session id
if ($newSession) {
session_regenerate_id();
}
/*
* Are we resuming an existing session? Determine this by checking
* to see if the session container variable is already set. If not, then
* create the appropriate container for it.
*/
if (empty($gallery->app->sessionVar)) {
$gSessionVar = "gallery_session_" . md5(getcwd());
} else {
$gSessionVar = $gallery->app->sessionVar . "_" . md5($gallery->app->userDir);
}
if (isset($_SESSION[$gSessionVar])) {
/* Get a simple reference to the session container (for convenience) */
$gallery->session =& $_SESSION[$gSessionVar];
/* DISABLED BY THE "0 &&" BELOW */
// Allow session-sharing in devMode so that pages can be validated using the W3 validation links
if (0 && ($gallery->app->devMode != "yes" && !empty($gallery->session->remoteHost)) && $gallery->session->remoteHost != $_SERVER['REMOTE_ADDR']) {
printf('Attempted session access from different IP address. Please <a href="%s">re-login</a>.', $gallery->app->photoAlbumURL . '?PHPSESSID=');
exit;
}
} else {
/* Create a new session container */
if (!empty($useStdClass)) {
$_SESSION[$gSessionVar] = new stdClass();
} else {
$_SESSION[$gSessionVar] = new GallerySession();
}
/* Get a simple reference to the session container (for convenience) */
$gallery->session =& $_SESSION[$gSessionVar];
/* Tag this session with the gallery version */
$gallery->session->version = $gallery->version;
$gallery->session->sessionStart = time();
$gallery->session->remoteHost = $_SERVER['REMOTE_ADDR'];
}
}
// Create or resume our session
createGallerySession();
update_session_var("albumName");
update_session_var("version");
update_session_var("albumListPage");
update_session_var("fullOnly");
update_session_var("username", 1);
update_session_var("offline");
update_session_var("offlineAlbums");
if (!isset($gallery->session->offlineAlbums) || $gallery->session->offlineAlbums == null)
{
$gallery->session->offlineAlbums=array();
}
/*
* Process changes to session variables via parameters submitted in a
* POST or GET.
*/
function update_session_var($name, $protected=0) {
global $gallery;
// If this is a protected session variable, don't allow it
// to be changed by data from POST or GET requests.
if ($protected) {
return;
}
$setname = "set_$name";
if (!emptyFormVar($setname)) {
$gallery->session->{$name} = formVar($setname);
}
}
?>
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