/other/upgrade.php

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<?php

/**
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines http://www.simplemachines.org
 * @copyright 2012 Simple Machines
 * @license http://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 Alpha 1
 */

// Version information...
define('SMF_VERSION', '2.1 Alpha 1');
define('SMF_LANG_VERSION', '2.1');

$GLOBALS['required_php_version'] = '5.1.0';
$GLOBALS['required_mysql_version'] = '4.0.18';

$databases = array(
	'mysql' => array(
		'name' => 'MySQL',
		'version' => '4.0.18',
		'version_check' => 'return min(mysql_get_server_info(), mysql_get_client_info());',
		'utf8_support' => true,
		'utf8_version' => '4.1.0',
		'utf8_version_check' => 'return mysql_get_server_info();',
		'alter_support' => true,
	),
	'postgresql' => array(
		'name' => 'PostgreSQL',
		'version' => '8.0',
		'version_check' => '$version = pg_version(); return $version[\'client\'];',
		'always_has_db' => true,
	),
	'sqlite' => array(
		'name' => 'SQLite',
		'version' => '1',
		'version_check' => 'return 1;',
		'always_has_db' => true,
	),
);

// General options for the script.
$timeLimitThreshold = 3;
$upgrade_path = dirname(__FILE__);
$upgradeurl = $_SERVER['PHP_SELF'];
// Where the SMF images etc are kept.
$smfsite = 'http://www.simplemachines.org/smf';
// Disable the need for admins to login?
$disable_security = false;
// How long, in seconds, must admin be inactive to allow someone else to run?
$upcontext['inactive_timeout'] = 10;

// All the steps in detail.
// Number,Name,Function,Progress Weight.
$upcontext['steps'] = array(
	0 => array(1, 'Login', 'WelcomeLogin', 2),
	1 => array(2, 'Upgrade Options', 'UpgradeOptions', 2),
	2 => array(3, 'Backup', 'BackupDatabase', 10),
	3 => array(4, 'Database Changes', 'DatabaseChanges', 70),
	// This is removed as it doesn't really work right at the moment.
	//4 => array(5, 'Cleanup Mods', 'CleanupMods', 10),
	4 => array(5, 'Delete Upgrade', 'DeleteUpgrade', 1),
);
// Just to remember which one has files in it.
$upcontext['database_step'] = 3;
@set_time_limit(600);
if (!ini_get('safe_mode'))
{
	ini_set('mysql.connect_timeout', -1); 
	ini_set('default_socket_timeout', 900);
}
// Clean the upgrade path if this is from the client.
if (!empty($_SERVER['argv']) && php_sapi_name() == 'cli' && empty($_SERVER['REMOTE_ADDR']))
	for ($i = 1; $i < $_SERVER['argc']; $i++)
	{
		if (preg_match('~^--path=(.+)$~', $_SERVER['argv'][$i], $match) != 0)
			$upgrade_path = substr($match[1], -1) == '/' ? substr($match[1], 0, -1) : $match[1];
	}

// Are we from the client?
if (php_sapi_name() == 'cli' && empty($_SERVER['REMOTE_ADDR']))
{
	$command_line = true;
	$disable_security = 1;
}
else
	$command_line = false;

// Load this now just because we can.
require_once($upgrade_path . '/Settings.php');

// Are we logged in?
if (isset($upgradeData))
{
	$upcontext['user'] = unserialize(base64_decode($upgradeData));

	// Check for sensible values.
	if (empty($upcontext['user']['started']) || $upcontext['user']['started'] < time() - 86400)
		$upcontext['user']['started'] = time();
	if (empty($upcontext['user']['updated']) || $upcontext['user']['updated'] < time() - 86400)
		$upcontext['user']['updated'] = 0;

	$upcontext['started'] = $upcontext['user']['started'];
	$upcontext['updated'] = $upcontext['user']['updated'];
}

// Nothing sensible?
if (empty($upcontext['updated']))
{
	$upcontext['started'] = time();
	$upcontext['updated'] = 0;
	$upcontext['user'] = array(
		'id' => 0,
		'name' => 'Guest',
		'pass' => 0,
		'started' => $upcontext['started'],
		'updated' => $upcontext['updated'],
	);
}

// Load up some essential data...
loadEssentialData();

// Are we going to be mimic'ing SSI at this point?
if (isset($_GET['ssi']))
{
	require_once($sourcedir . '/Subs.php');
	require_once($sourcedir . '/Errors.php');
	require_once($sourcedir . '/Logging.php');
	require_once($sourcedir . '/Load.php');
	require_once($sourcedir . '/Security.php');
	require_once($sourcedir . '/Subs-Package.php');

	loadUserSettings();
	loadPermissions();
}

// All the non-SSI stuff.
if (!function_exists('ip2range'))
	require_once($sourcedir . '/Subs.php');

if (!function_exists('un_htmlspecialchars'))
{
	function un_htmlspecialchars($string)
	{
		return strtr($string, array_flip(get_html_translation_table(HTML_SPECIALCHARS, ENT_QUOTES)) + array('&#039;' => '\'', '&nbsp;' => ' '));
	}
}

if (!function_exists('text2words'))
{
	function text2words($text)
	{
		global $smcFunc;

		// Step 1: Remove entities/things we don't consider words:
		$words = preg_replace('~(?:[\x0B\0\xA0\t\r\s\n(){}\\[\\]<>!@$%^*.,:+=`\~\?/\\\\]+|&(?:amp|lt|gt|quot);)+~', ' ', $text);

		// Step 2: Entities we left to letters, where applicable, lowercase.
		$words = preg_replace('~([^&\d]|^)[#;]~', '$1 ', un_htmlspecialchars(strtolower($words)));

		// Step 3: Ready to split apart and index!
		$words = explode(' ', $words);
		$returned_words = array();
		foreach ($words as $word)
		{
			$word = trim($word, '-_\'');

			if ($word != '')
				$returned_words[] = substr($word, 0, 20);
		}

		return array_unique($returned_words);
	}
}

if (!function_exists('clean_cache'))
{
	// Empty out the cache folder.
	function clean_cache($type = '')
	{
		global $cachedir, $sourcedir;

		// No directory = no game.
		if (!is_dir($cachedir))
			return;

		// Remove the files in SMF's own disk cache, if any
		$dh = opendir($cachedir);
		while ($file = readdir($dh))
		{
			if ($file != '.' && $file != '..' && $file != 'index.php' && $file != '.htaccess' && (!$type || substr($file, 0, strlen($type)) == $type))
				@unlink($cachedir . '/' . $file);
		}
		closedir($dh);

		// Invalidate cache, to be sure!
		// ... as long as Load.php can be modified, anyway.
		@touch($sourcedir . '/' . 'Load.php');
		clearstatcache();
	}
}

// MD5 Encryption.
if (!function_exists('md5_hmac'))
{
	function md5_hmac($data, $key)
	{
		if (strlen($key) > 64)
			$key = pack('H*', md5($key));
		$key = str_pad($key, 64, chr(0x00));

		$k_ipad = $key ^ str_repeat(chr(0x36), 64);
		$k_opad = $key ^ str_repeat(chr(0x5c), 64);

		return md5($k_opad . pack('H*', md5($k_ipad . $data)));
	}
}

// http://www.faqs.org/rfcs/rfc959.html
if (!class_exists('ftp_connection'))
{
	class ftp_connection
	{
		var $connection = 'no_connection', $error = false, $last_message, $pasv = array();

		// Create a new FTP connection...
		function ftp_connection($ftp_server, $ftp_port = 21, $ftp_user = 'anonymous', $ftp_pass = 'ftpclient@simplemachines.org')
		{
			if ($ftp_server !== null)
				$this->connect($ftp_server, $ftp_port, $ftp_user, $ftp_pass);
		}

		function connect($ftp_server, $ftp_port = 21, $ftp_user = 'anonymous', $ftp_pass = 'ftpclient@simplemachines.org')
		{
			if (substr($ftp_server, 0, 6) == 'ftp://')
				$ftp_server = substr($ftp_server, 6);
			elseif (substr($ftp_server, 0, 7) == 'ftps://')
				$ftp_server = 'ssl://' . substr($ftp_server, 7);
			if (substr($ftp_server, 0, 7) == 'http://')
				$ftp_server = substr($ftp_server, 7);
			$ftp_server = strtr($ftp_server, array('/' => '', ':' => '', '@' => ''));

			// Connect to the FTP server.
			$this->connection = @fsockopen($ftp_server, $ftp_port, $err, $err, 5);
			if (!$this->connection)
			{
				$this->error = 'bad_server';
				return;
			}

			// Get the welcome message...
			if (!$this->check_response(220))
			{
				$this->error = 'bad_response';
				return;
			}

			// Send the username, it should ask for a password.
			fwrite($this->connection, 'USER ' . $ftp_user . "\r\n");
			if (!$this->check_response(331))
			{
				$this->error = 'bad_username';
				return;
			}

			// Now send the password... and hope it goes okay.
			fwrite($this->connection, 'PASS ' . $ftp_pass . "\r\n");
			if (!$this->check_response(230))
			{
				$this->error = 'bad_password';
				return;
			}
		}

		function chdir($ftp_path)
		{
			if (!is_resource($this->connection))
				return false;

			// No slash on the end, please...
			if (substr($ftp_path, -1) == '/' && $ftp_path !== '/')
				$ftp_path = substr($ftp_path, 0, -1);

			fwrite($this->connection, 'CWD ' . $ftp_path . "\r\n");
			if (!$this->check_response(250))
			{
				$this->error = 'bad_path';
				return false;
			}

			return true;
		}

		function chmod($ftp_file, $chmod)
		{
			if (!is_resource($this->connection))
				return false;

			// Convert the chmod value from octal (0777) to text ("777").
			fwrite($this->connection, 'SITE CHMOD ' . decoct($chmod) . ' ' . $ftp_file . "\r\n");
			if (!$this->check_response(200))
			{
				$this->error = 'bad_file';
				return false;
			}

			return true;
		}

		function unlink($ftp_file)
		{
			// We are actually connected, right?
			if (!is_resource($this->connection))
				return false;

			// Delete file X.
			fwrite($this->connection, 'DELE ' . $ftp_file . "\r\n");
			if (!$this->check_response(250))
			{
				fwrite($this->connection, 'RMD ' . $ftp_file . "\r\n");

				// Still no love?
				if (!$this->check_response(250))
				{
					$this->error = 'bad_file';
					return false;
				}
			}

			return true;
		}

		function check_response($desired)
		{
			// Wait for a response that isn't continued with -, but don't wait too long.
			$time = time();
			do
				$this->last_message = fgets($this->connection, 1024);
			while (substr($this->last_message, 3, 1) != ' ' && time() - $time < 5);

			// Was the desired response returned?
			return is_array($desired) ? in_array(substr($this->last_message, 0, 3), $desired) : substr($this->last_message, 0, 3) == $desired;
		}

		function passive()
		{
			// We can't create a passive data connection without a primary one first being there.
			if (!is_resource($this->connection))
				return false;

			// Request a passive connection - this means, we'll talk to you, you don't talk to us.
			@fwrite($this->connection, 'PASV' . "\r\n");
			$time = time();
			do
				$response = fgets($this->connection, 1024);
			while (substr($response, 3, 1) != ' ' && time() - $time < 5);

			// If it's not 227, we weren't given an IP and port, which means it failed.
			if (substr($response, 0, 4) != '227 ')
			{
				$this->error = 'bad_response';
				return false;
			}

			// Snatch the IP and port information, or die horribly trying...
			if (preg_match('~\((\d+),\s*(\d+),\s*(\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))\)~', $response, $match) == 0)
			{
				$this->error = 'bad_response';
				return false;
			}

			// This is pretty simple - store it for later use ;).
			$this->pasv = array('ip' => $match[1] . '.' . $match[2] . '.' . $match[3] . '.' . $match[4], 'port' => $match[5] * 256 + $match[6]);

			return true;
		}

		function create_file($ftp_file)
		{
			// First, we have to be connected... very important.
			if (!is_resource($this->connection))
				return false;

			// I'd like one passive mode, please!
			if (!$this->passive())
				return false;

			// Seems logical enough, so far...
			fwrite($this->connection, 'STOR ' . $ftp_file . "\r\n");

			// Okay, now we connect to the data port.  If it doesn't work out, it's probably "file already exists", etc.
			$fp = @fsockopen($this->pasv['ip'], $this->pasv['port'], $err, $err, 5);
			if (!$fp || !$this->check_response(150))
			{
				$this->error = 'bad_file';
				@fclose($fp);
				return false;
			}

			// This may look strange, but we're just closing it to indicate a zero-byte upload.
			fclose($fp);
			if (!$this->check_response(226))
			{
				$this->error = 'bad_response';
				return false;
			}

			return true;
		}

		function list_dir($ftp_path = '', $search = false)
		{
			// Are we even connected...?
			if (!is_resource($this->connection))
				return false;

			// Passive... non-agressive...
			if (!$this->passive())
				return false;

			// Get the listing!
			fwrite($this->connection, 'LIST -1' . ($search ? 'R' : '') . ($ftp_path == '' ? '' : ' ' . $ftp_path) . "\r\n");

			// Connect, assuming we've got a connection.
			$fp = @fsockopen($this->pasv['ip'], $this->pasv['port'], $err, $err, 5);
			if (!$fp || !$this->check_response(array(150, 125)))
			{
				$this->error = 'bad_response';
				@fclose($fp);
				return false;
			}

			// Read in the file listing.
			$data = '';
			while (!feof($fp))
				$data .= fread($fp, 4096);
			fclose($fp);

			// Everything go okay?
			if (!$this->check_response(226))
			{
				$this->error = 'bad_response';
				return false;
			}

			return $data;
		}

		function locate($file, $listing = null)
		{
			if ($listing === null)
				$listing = $this->list_dir('', true);
			$listing = explode("\n", $listing);

			@fwrite($this->connection, 'PWD' . "\r\n");
			$time = time();
			do
				$response = fgets($this->connection, 1024);
			while (substr($response, 3, 1) != ' ' && time() - $time < 5);

			// Check for 257!
			if (preg_match('~^257 "(.+?)" ~', $response, $match) != 0)
				$current_dir = strtr($match[1], array('""' => '"'));
			else
				$current_dir = '';

			for ($i = 0, $n = count($listing); $i < $n; $i++)
			{
				if (trim($listing[$i]) == '' && isset($listing[$i + 1]))
				{
					$current_dir = substr(trim($listing[++$i]), 0, -1);
					$i++;
				}

				// Okay, this file's name is:
				$listing[$i] = $current_dir . '/' . trim(strlen($listing[$i]) > 30 ? strrchr($listing[$i], ' ') : $listing[$i]);

				if (substr($file, 0, 1) == '*' && substr($listing[$i], -(strlen($file) - 1)) == substr($file, 1))
					return $listing[$i];
				if (substr($file, -1) == '*' && substr($listing[$i], 0, strlen($file) - 1) == substr($file, 0, -1))
					return $listing[$i];
				if (basename($listing[$i]) == $file || $listing[$i] == $file)
					return $listing[$i];
			}

			return false;
		}

		function create_dir($ftp_dir)
		{
			// We must be connected to the server to do something.
			if (!is_resource($this->connection))
				return false;

			// Make this new beautiful directory!
			fwrite($this->connection, 'MKD ' . $ftp_dir . "\r\n");
			if (!$this->check_response(257))
			{
				$this->error = 'bad_file';
				return false;
			}

			return true;
		}

		function detect_path($filesystem_path, $lookup_file = null)
		{
			$username = '';

			if (isset($_SERVER['DOCUMENT_ROOT']))
			{
				if (preg_match('~^/home[2]?/([^/]+?)/public_html~', $_SERVER['DOCUMENT_ROOT'], $match))
				{
					$username = $match[1];

					$path = strtr($_SERVER['DOCUMENT_ROOT'], array('/home/' . $match[1] . '/' => '', '/home2/' . $match[1] . '/' => ''));

					if (substr($path, -1) == '/')
						$path = substr($path, 0, -1);

					if (strlen(dirname($_SERVER['PHP_SELF'])) > 1)
						$path .= dirname($_SERVER['PHP_SELF']);
				}
				elseif (substr($filesystem_path, 0, 9) == '/var/www/')
					$path = substr($filesystem_path, 8);
				else
					$path = strtr(strtr($filesystem_path, array('\\' => '/')), array($_SERVER['DOCUMENT_ROOT'] => ''));
			}
			else
				$path = '';

			if (is_resource($this->connection) && $this->list_dir($path) == '')
			{
				$data = $this->list_dir('', true);

				if ($lookup_file === null)
					$lookup_file = $_SERVER['PHP_SELF'];

				$found_path = dirname($this->locate('*' . basename(dirname($lookup_file)) . '/' . basename($lookup_file), $data));
				if ($found_path == false)
					$found_path = dirname($this->locate(basename($lookup_file)));
				if ($found_path != false)
					$path = $found_path;
			}
			elseif (is_resource($this->connection))
				$found_path = true;

			return array($username, $path, isset($found_path));
		}

		function close()
		{
			// Goodbye!
			fwrite($this->connection, 'QUIT' . "\r\n");
			fclose($this->connection);

			return true;
		}
	}
}

// Have we got tracking data - if so use it (It will be clean!)
if (isset($_GET['data']))
{
	$upcontext['upgrade_status'] = unserialize(base64_decode($_GET['data']));
	$upcontext['current_step'] = $upcontext['upgrade_status']['curstep'];
	$upcontext['language'] = $upcontext['upgrade_status']['lang'];
	$upcontext['rid'] = $upcontext['upgrade_status']['rid'];
	$is_debug = $upcontext['upgrade_status']['debug'];
	$support_js = $upcontext['upgrade_status']['js'];

	// Load the language.
	if (file_exists($boarddir . '/Themes/default/languages/Install.' . $upcontext['language'] . '.php'))
		require_once($boarddir . '/Themes/default/languages/Install.' . $upcontext['language'] . '.php');
}
// Set the defaults.
else
{
	$upcontext['current_step'] = 0;
	$upcontext['rid'] = mt_rand(0, 5000);
	$upcontext['upgrade_status'] = array(
		'curstep' => 0,
		'lang' => isset($_GET['lang']) ? $_GET['lang'] : basename($language, '.lng'),
		'rid' => $upcontext['rid'],
		'pass' => 0,
		'debug' => 0,
		'js' => 0,
	);
	$upcontext['language'] = $upcontext['upgrade_status']['lang'];
}

// Don't do security check if on Yabbse
if (!isset($modSettings['smfVersion']))
	$disable_security = true;

// If this isn't the first stage see whether they are logging in and resuming.
if ($upcontext['current_step'] != 0 || !empty($upcontext['user']['step']))
	checkLogin();

// This only exists if we're on SMF ;)
if (isset($modSettings['smfVersion']))
{
	$request = $smcFunc['db_query']('', '
		SELECT variable, value
		FROM {db_prefix}themes
		WHERE id_theme = {int:id_theme}
			AND variable IN ({string:theme_url}, {string:theme_dir}, {string:images_url})',
		array(
			'id_theme' => 1,
			'theme_url' => 'theme_url',
			'theme_dir' => 'theme_dir',
			'images_url' => 'images_url',
			'db_error_skip' => true,
		)
	);
	while ($row = $smcFunc['db_fetch_assoc']($request))
		$modSettings[$row['variable']] = $row['value'];
	$smcFunc['db_free_result']($request);
}

if (!isset($modSettings['theme_url']))
{
	$modSettings['theme_dir'] = $boarddir . '/Themes/default';
	$modSettings['theme_url'] = 'Themes/default';
	$modSettings['images_url'] = 'Themes/default/images';
}
if (!isset($settings['default_theme_url']))
	$settings['default_theme_url'] = $modSettings['theme_url'];
if (!isset($settings['default_theme_dir']))
	$settings['default_theme_dir'] = $modSettings['theme_dir'];

$upcontext['is_large_forum'] = (empty($modSettings['smfVersion']) || $modSettings['smfVersion'] <= '1.1 RC1') && !empty($modSettings['totalMessages']) && $modSettings['totalMessages'] > 75000;
// Default title...
$upcontext['page_title'] = isset($modSettings['smfVersion']) ? 'Updating Your SMF Install!' : 'Upgrading from YaBB SE!';

$upcontext['right_to_left'] = isset($txt['lang_rtl']) ? $txt['lang_rtl'] : false;

if ($command_line)
	cmdStep0();

// Don't error if we're using xml.
if (isset($_GET['xml']))
	$upcontext['return_error'] = true;

// Loop through all the steps doing each one as required.
$upcontext['overall_percent'] = 0;
foreach ($upcontext['steps'] as $num => $step)
{
	if ($num >= $upcontext['current_step'])
	{
		// The current weight of this step in terms of overall progress.
		$upcontext['step_weight'] = $step[3];
		// Make sure we reset the skip button.
		$upcontext['skip'] = false;

		// We cannot proceed if we're not logged in.
		if ($num != 0 && !$disable_security && $upcontext['user']['pass'] != $upcontext['upgrade_status']['pass'])
		{
			$upcontext['steps'][0][2]();
			break;
		}

		// Call the step and if it returns false that means pause!
		if (function_exists($step[2]) && $step[2]() === false)
			break;
		elseif (function_exists($step[2]))
			$upcontext['current_step']++;
	}
	$upcontext['overall_percent'] += $step[3];
}

upgradeExit();

// Exit the upgrade script.
function upgradeExit($fallThrough = false)
{
	global $upcontext, $upgradeurl, $boarddir, $command_line;

	// Save where we are...
	if (!empty($upcontext['current_step']) && !empty($upcontext['user']['id']))
	{
		$upcontext['user']['step'] = $upcontext['current_step'];
		$upcontext['user']['substep'] = $_GET['substep'];
		$upcontext['user']['updated'] = time();
		$upgradeData = base64_encode(serialize($upcontext['user']));
		copy($boarddir . '/Settings.php', $boarddir . '/Settings_bak.php');
		changeSettings(array('upgradeData' => '"' . $upgradeData . '"'));
		updateLastError();
	}

	// Handle the progress of the step, if any.
	if (!empty($upcontext['step_progress']) && isset($upcontext['steps'][$upcontext['current_step']]))
	{
		$upcontext['step_progress'] = round($upcontext['step_progress'], 1);
		$upcontext['overall_percent'] += $upcontext['step_progress'] * ($upcontext['steps'][$upcontext['current_step']][3] / 100);
	}
	$upcontext['overall_percent'] = (int) $upcontext['overall_percent'];

	// We usually dump our templates out.
	if (!$fallThrough)
	{
		// This should not happen my dear... HELP ME DEVELOPERS!!
		if (!empty($command_line))
		{
			if (function_exists('debug_print_backtrace'))
				debug_print_backtrace();

			echo "\n" . 'Error: Unexpected call to use the ' . (isset($upcontext['sub_template']) ? $upcontext['sub_template'] : '') . ' template. Please copy and paste all the text above and visit the SMF support forum to tell the Developers that they\'ve made a boo boo; they\'ll get you up and running again.';
			flush();
			die();
		}

		if (!isset($_GET['xml']))
			template_upgrade_above();
		else
		{
			header('Content-Type: text/xml; charset=ISO-8859-1');
			// Sadly we need to retain the $_GET data thanks to the old upgrade scripts.
			$upcontext['get_data'] = array();
			foreach ($_GET as $k => $v)
			{
				if (substr($k, 0, 3) != 'amp' && !in_array($k, array('xml', 'substep', 'lang', 'data', 'step', 'filecount')))
				{
					$upcontext['get_data'][$k] = $v;
				}
			}
			template_xml_above();
		}

		// Call the template.
		if (isset($upcontext['sub_template']))
		{
			$upcontext['upgrade_status']['curstep'] = $upcontext['current_step'];
			$upcontext['form_url'] = $upgradeurl . '?step=' . $upcontext['current_step'] . '&amp;substep=' . $_GET['substep'] . '&amp;data=' . base64_encode(serialize($upcontext['upgrade_status']));

			// Custom stuff to pass back?
			if (!empty($upcontext['query_string']))
				$upcontext['form_url'] .= $upcontext['query_string'];

			call_user_func('template_' . $upcontext['sub_template']);
		}

		// Was there an error?
		if (!empty($upcontext['forced_error_message']))
			echo $upcontext['forced_error_message'];

		// Show the footer.
		if (!isset($_GET['xml']))
			template_upgrade_below();
		else
			template_xml_below();
	}

	// Bang - gone!
	die();
}

// Used to direct the user to another location.
function redirectLocation($location, $addForm = true)
{
	global $upgradeurl, $upcontext, $command_line;

	// Command line users can't be redirected.
	if ($command_line)
		upgradeExit(true);

	// Are we providing the core info?
	if ($addForm)
	{
		$upcontext['upgrade_status']['curstep'] = $upcontext['current_step'];
		$location = $upgradeurl . '?step=' . $upcontext['current_step'] . '&substep=' . $_GET['substep'] . '&data=' . base64_encode(serialize($upcontext['upgrade_status'])) . $location;
	}

	while (@ob_end_clean());
	header('Location: ' . strtr($location, array('&amp;' => '&')));

	// Exit - saving status as we go.
	upgradeExit(true);
}

// Load all essential data and connect to the DB as this is pre SSI.php
function loadEssentialData()
{
	global $db_server, $db_user, $db_passwd, $db_name, $db_connection, $db_prefix, $db_character_set, $db_type;
	global $modSettings, $sourcedir, $smcFunc, $upcontext;

	// Do the non-SSI stuff...
	@set_magic_quotes_runtime(0);
	error_reporting(E_ALL);
	define('SMF', 1);

	// Start the session.
	if (@ini_get('session.save_handler') == 'user')
		@ini_set('session.save_handler', 'files');
	@session_start();

	if (empty($smcFunc))
		$smcFunc = array();

	// Check we don't need some compatibility.
	if (@version_compare(PHP_VERSION, '5.1', '<='))
		require_once($sourcedir . '/Subs-Compat.php');

	// Initialize everything...
	initialize_inputs();

	// Get the database going!
	if (empty($db_type))
		$db_type = 'mysql';
	if (file_exists($sourcedir . '/Subs-Db-' . $db_type . '.php'))
	{
		require_once($sourcedir . '/Subs-Db-' . $db_type . '.php');

		// Make the connection...
		$db_connection = smf_db_initiate($db_server, $db_name, $db_user, $db_passwd, $db_prefix, array('non_fatal' => true));

		// Oh dear god!!
		if ($db_connection === null)
			die('Unable to connect to database - please check username and password are correct in Settings.php');

		if ($db_type == 'mysql' && isset($db_character_set) && preg_match('~^\w+$~', $db_character_set) === 1)
			$smcFunc['db_query']('', '
			SET NAMES ' . $db_character_set,
			array(
				'db_error_skip' => true,
			)
		);

		// Load the modSettings data...
		$request = $smcFunc['db_query']('', '
			SELECT variable, value
			FROM {db_prefix}settings',
			array(
				'db_error_skip' => true,
			)
		);
		$modSettings = array();
		while ($row = $smcFunc['db_fetch_assoc']($request))
			$modSettings[$row['variable']] = $row['value'];
		$smcFunc['db_free_result']($request);
	}
	else
	{
		return throw_error('Cannot find ' . $sourcedir . '/Subs-Db-' . $db_type . '.php' . '. Please check you have uploaded all source files and have the correct paths set.');
	}

	// If they don't have the file, they're going to get a warning anyway so we won't need to clean request vars.
	if (file_exists($sourcedir . '/QueryString.php'))
	{
		require_once($sourcedir . '/QueryString.php');
		cleanRequest();
	}

	if (!isset($_GET['substep']))
		$_GET['substep'] = 0;
}

function initialize_inputs()
{
	global $sourcedir, $start_time, $upcontext, $db_type;

	$start_time = time();

	umask(0);

	// Fun.  Low PHP version...
	if (!isset($_GET))
	{
		$GLOBALS['_GET']['step'] = 0;
		return;
	}

	ob_start();

	// Better to upgrade cleanly and fall apart than to screw everything up if things take too long.
	ignore_user_abort(true);

	// This is really quite simple; if ?delete is on the URL, delete the upgrader...
	if (isset($_GET['delete']))
	{
		@unlink(__FILE__);

		// And the extra little files ;).
		@unlink(dirname(__FILE__) . '/upgrade_1-0.sql');
		@unlink(dirname(__FILE__) . '/upgrade_1-1.sql');
		@unlink(dirname(__FILE__) . '/upgrade_2-0_' . $db_type . '.sql');
		@unlink(dirname(__FILE__) . '/upgrade_2-1_' . $db_type . '.sql');
		@unlink(dirname(__FILE__) . '/webinstall.php');

		$dh = opendir(dirname(__FILE__));
		while ($file = readdir($dh))
		{
			if (preg_match('~upgrade_\d-\d_([A-Za-z])+\.sql~i', $file, $matches) && isset($matches[1]))
				@unlink(dirname(__FILE__) . '/' . $file);
		}
		closedir($dh);

		header('Location: http://' . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'] . ':' . $_SERVER['SERVER_PORT']) . dirname($_SERVER['PHP_SELF']) . '/Themes/default/images/blank.png');
		exit;
	}

	// Are we calling the backup css file?
	if (isset($_GET['infile_css']))
	{
		header('Content-Type: text/css');
		template_css();
		exit;
	}

	// Anybody home?
	if (!isset($_GET['xml']))
	{
		$upcontext['remote_files_available'] = false;
		$test = @fsockopen('www.simplemachines.org', 80, $errno, $errstr, 1);
		if ($test)
			$upcontext['remote_files_available'] = true;
		@fclose($test);
	}

	// Something is causing this to happen, and it's annoying.  Stop it.
	$temp = 'upgrade_php?step';
	while (strlen($temp) > 4)
	{
		if (isset($_GET[$temp]))
			unset($_GET[$temp]);
		$temp = substr($temp, 1);
	}

	// Force a step, defaulting to 0.
	$_GET['step'] = (int) @$_GET['step'];
	$_GET['substep'] = (int) @$_GET['substep'];
}

// Step 0 - Let's welcome them in and ask them to login!
function WelcomeLogin()
{
	global $boarddir, $sourcedir, $db_prefix, $language, $modSettings, $cachedir, $upgradeurl, $upcontext, $disable_security;
	global $smcFunc, $db_type, $databases, $txt;

	$upcontext['sub_template'] = 'welcome_message';

	// Check for some key files - one template, one language, and a new and an old source file.
	$check = @file_exists($boarddir . '/Themes/default/index.template.php')
		&& @file_exists($sourcedir . '/QueryString.php')
		&& @file_exists($sourcedir . '/Subs-Db-' . $db_type . '.php')
		&& @file_exists(dirname(__FILE__) . '/upgrade_2-1_' . $db_type . '.sql');

	// Need legacy scripts?
	if (!isset($modSettings['smfVersion']) || $modSettings['smfVersion'] < 2.1)
		$check &= @file_exists(dirname(__FILE__) . '/upgrade_2-0_' . $db_type . '.sql');
	if (!isset($modSettings['smfVersion']) || $modSettings['smfVersion'] < 2.0)
		$check &= @file_exists(dirname(__FILE__) . '/upgrade_1-1.sql');
	if (!isset($modSettings['smfVersion']) || $modSettings['smfVersion'] < 1.1)
		$check &= @file_exists(dirname(__FILE__) . '/upgrade_1-0.sql');

	if (!$check)
		// Don't tell them what files exactly because it's a spot check - just like teachers don't tell which problems they are spot checking, that's dumb.
		return throw_error('The upgrader was unable to find some crucial files.<br /><br />Please make sure you uploaded all of the files included in the package, including the Themes, Sources, and other directories.');

	// Do they meet the install requirements?
	if (!php_version_check())
		return throw_error('Warning!  You do not appear to have a version of PHP installed on your webserver that meets SMF\'s minimum installations requirements.<br /><br />Please ask your host to upgrade.');

	if (!db_version_check())
		return throw_error('Your ' . $databases[$db_type]['name'] . ' version does not meet the minimum requirements of SMF.<br /><br />Please ask your host to upgrade.');

	// Do they have ALTER privileges?
	if (!empty($databases[$db_type]['alter_support']) && $smcFunc['db_query']('alter_boards', 'ALTER TABLE {db_prefix}boards ORDER BY id_board', array()) === false)
		return throw_error('The ' . $databases[$db_type]['name'] . ' user you have set in Settings.php does not have proper privileges.<br /><br />Please ask your host to give this user the ALTER, CREATE, and DROP privileges.');

	// Do a quick version spot check.
	$temp = substr(@implode('', @file($boarddir . '/index.php')), 0, 4096);
	preg_match('~\*\s@version\s+(.+)[\s]{2}~i', $temp, $match);
	if (empty($match[1]) || $match[1] != SMF_VERSION)
		return throw_error('The upgrader found some old or outdated files.<br /><br />Please make certain you uploaded the new versions of all the files included in the package.');

	// What absolutely needs to be writable?
	$writable_files = array(
		$boarddir . '/Settings.php',
		$boarddir . '/Settings_bak.php',
	);

	require_once($sourcedir . '/Security.php');
	createToken('login');

	// Check the cache directory.
	$cachedir_temp = empty($cachedir) ? $boarddir . '/cache' : $cachedir;
	if (!file_exists($cachedir_temp))
		@mkdir($cachedir_temp);
	if (!file_exists($cachedir_temp))
		return throw_error('The cache directory could not be found.<br /><br />Please make sure you have a directory called &quot;cache&quot; in your forum directory before continuing.');

	if (!file_exists($boarddir . '/Themes/default/languages/index.' . $upcontext['language'] . '.php') && !isset($modSettings['smfVersion']) && !isset($_GET['lang']))
		return throw_error('The upgrader was unable to find language files for the language specified in Settings.php.<br />SMF will not work without the primary language files installed.<br /><br />Please either install them, or <a href="' . $upgradeurl . '?step=0;lang=english">use english instead</a>.');
	elseif (!isset($_GET['skiplang']))
	{
		$temp = substr(@implode('', @file($boarddir . '/Themes/default/languages/index.' . $upcontext['language'] . '.php')), 0, 4096);
		preg_match('~(?://|/\*)\s*Version:\s+(.+?);\s*index(?:[\s]{2}|\*/)~i', $temp, $match);

		if (empty($match[1]) || $match[1] != SMF_LANG_VERSION)
			return throw_error('The upgrader found some old or outdated language files, for the forum default language, ' . $upcontext['language'] . '.<br /><br />Please make certain you uploaded the new versions of all the files included in the package, even the theme and language files for the default theme.<br />&nbsp;&nbsp;&nbsp;[<a href="' . $upgradeurl . '?skiplang">SKIP</a>] [<a href="' . $upgradeurl . '?lang=english">Try English</a>]');
	}

	// This needs to exist!
	if (!file_exists($boarddir . '/Themes/default/languages/Install.' . $upcontext['language'] . '.php'))
		return throw_error('The upgrader could not find the &quot;Install&quot; language file for the forum default language, ' . $upcontext['language'] . '.<br /><br />Please make certain you uploaded all the files included in the package, even the theme and language files for the default theme.<br />&nbsp;&nbsp;&nbsp;[<a href="' . $upgradeurl . '?lang=english">Try English</a>]');
	else
		require_once($boarddir . '/Themes/default/languages/Install.' . $upcontext['language'] . '.php');

	if (!makeFilesWritable($writable_files))
		return false;

	// Check agreement.txt. (it may not exist, in which case $boarddir must be writable.)
	if (isset($modSettings['agreement']) && (!is_writable($boarddir) || file_exists($boarddir . '/agreement.txt')) && !is_writable($boarddir . '/agreement.txt'))
		return throw_error('The upgrader was unable to obtain write access to agreement.txt.<br /><br />If you are using a linux or unix based server, please ensure that the file is chmod\'d to 777, or if it does not exist that the directory this upgrader is in is 777.<br />If your server is running Windows, please ensure that the internet guest account has the proper permissions on it or its folder.');

	// Upgrade the agreement.
	elseif (isset($modSettings['agreement']))
	{
		$fp = fopen($boarddir . '/agreement.txt', 'w');
		fwrite($fp, $modSettings['agreement']);
		fclose($fp);
	}

	// We're going to check that their board dir setting is right incase they've been moving stuff around.
	if (strtr($boarddir, array('/' => '', '\\' => '')) != strtr(dirname(__FILE__), array('/' => '', '\\' => '')))
		$upcontext['warning'] = '
			It looks as if your board directory settings <em>might</em> be incorrect. Your board directory is currently set to &quot;' . $boarddir . '&quot; but should probably be &quot;' . dirname(__FILE__) . '&quot;. Settings.php currently lists your paths as:<br />
			<ul>
				<li>Board Directory: ' . $boarddir . '</li>
				<li>Source Directory: ' . $boarddir . '</li>
				<li>Cache Directory: ' . $cachedir_temp . '</li>
			</ul>
			If these seem incorrect please open Settings.php in a text editor before proceeding with this upgrade. If they are incorrect due to you moving your forum to a new location please download and execute the <a href="http://download.simplemachines.org/?tools">Repair Settings</a> tool from the Simple Machines website before continuing.';

	// Either we're logged in or we're going to present the login.
	if (checkLogin())
		return true;

	return false;
}

// Step 0.5: Does the login work?
function checkLogin()
{
	global $boarddir, $sourcedir, $db_prefix, $language, $modSettings, $cachedir, $upgradeurl, $upcontext, $disable_security;
	global $smcFunc, $db_type, $databases, $support_js, $txt;

	// Are we trying to login?
	if (isset($_POST['contbutt']) && (!empty($_POST['user']) || $disable_security))
	{
		// If we've disabled security pick a suitable name!
		if (empty($_POST['user']))
			$_POST['user'] = 'Administrator';

		// Before 2.0 these column names were different!
		$oldDB = false;
		if (empty($db_type) || $db_type == 'mysql')
		{
			$request = $smcFunc['db_query']('', '
				SHOW COLUMNS
				FROM {db_prefix}members
				LIKE {string:member_name}',
				array(
					'member_name' => 'memberName',
					'db_error_skip' => true,
				)
			);
			if ($smcFunc['db_num_rows']($request) != 0)
				$oldDB = true;
			$smcFunc['db_free_result']($request);
		}

		// Get what we believe to be their details.
		if (!$disable_security)
		{
			if ($oldDB)
				$request = $smcFunc['db_query']('', '
					SELECT id_member, memberName AS member_name, passwd, id_group,
					additionalGroups AS additional_groups, lngfile
					FROM {db_prefix}members
					WHERE memberName = {string:member_name}',
					array(
						'member_name' => $_POST['user'],
						'db_error_skip' => true,
					)
				);
			else
				$request = $smcFunc['db_query']('', '
					SELECT id_member, member_name, passwd, id_group, additional_groups, lngfile
					FROM {db_prefix}members
					WHERE member_name = {string:member_name}',
					array(
						'member_name' => $_POST['user'],
						'db_error_skip' => true,
					)
				);
			if ($smcFunc['db_num_rows']($request) != 0)
			{
				list ($id_member, $name, $password, $id_group, $addGroups, $user_language) = $smcFunc['db_fetch_row']($request);

				$groups = explode(',', $addGroups);
				$groups[] = $id_group;

				foreach ($groups as $k => $v)
					$groups[$k] = (int) $v;

				// Figure out the password using SMF's encryption - if what they typed is right.
				if (isset($_REQUEST['hash_passwrd']) && strlen($_REQUEST['hash_passwrd']) == 40)
				{
					// Challenge passed.
					if ($_REQUEST['hash_passwrd'] == sha1($password . $upcontext['rid']))
						$sha_passwd = $password;
				}
				else
					$sha_passwd = sha1(strtolower($name) . un_htmlspecialchars($_REQUEST['passwrd']));
			}
			else
				$upcontext['username_incorrect'] = true;
			$smcFunc['db_free_result']($request);
		}
		$upcontext['username'] = $_POST['user'];

		// Track whether javascript works!
		if (!empty($_POST['js_works']))
		{
			$upcontext['upgrade_status']['js'] = 1;
			$support_js = 1;
		}
		else
			$support_js = 0;

		// Note down the version we are coming from.
		if (!empty($modSettings['smfVersion']) && empty($upcontext['user']['version']))
			$upcontext['user']['version'] = $modSettings['smfVersion'];

		// Didn't get anywhere?
		if ((empty($sha_passwd) || $password != $sha_passwd) && empty($upcontext['username_incorrect']) && !$disable_security)
		{
			// MD5?
			$md5pass = md5_hmac($_REQUEST['passwrd'], strtolower($_POST['user']));
			if ($md5pass != $password)
			{
				$upcontext['password_failed'] = true;
				// Disable the hashing this time.
				$upcontext['disable_login_hashing'] = true;
			}
		}

		if ((empty($upcontext['password_failed']) && !empty($name)) || $disable_security)
		{
			// Set the password.
			if (!$disable_security)
			{
				// Do we actually have permission?
				if (!in_array(1, $groups))
				{
					$request = $smcFunc['db_query']('', '
						SELECT permission
						FROM {db_prefix}permissions
						WHERE id_group IN ({array_int:groups})
							AND permission = {string:admin_forum}',
						array(
							'groups' => $groups,
							'admin_forum' => 'admin_forum',
							'db_error_skip' => true,
						)
					);
					if ($smcFunc['db_num_rows']($request) == 0)
						return throw_error('You need to be an admin to perform an upgrade!');
					$smcFunc['db_free_result']($request);
				}

				$upcontext['user']['id'] = $id_member;
				$upcontext['user']['name'] = $name;
			}
			else
			{
				$upcontext['user']['id'] = 1;
				$upcontext['user']['name'] = 'Administrator';
			}
			$upcontext['user']['pass'] = mt_rand(0,60000);
			// This basically is used to match the GET variables to Settings.php.
			$upcontext['upgrade_status']['pass'] = $upcontext['user']['pass'];

			// Set the language to that of the user?
			if (isset($user_language) && $user_language != $upcontext['language'] && file_exists($boarddir . '/Themes/default/languages/index.' . basename($user_language, '.lng') . '.php'))
			{
				$user_language = basename($user_language, '.lng');
				$temp = substr(@implode('', @file($boarddir . '/Themes/default/languages/index.' . $user_language . '.php')), 0, 4096);
				preg_match('~(?://|/\*)\s*Version:\s+(.+?);\s*index(?:[\s]{2}|\*/)~i', $temp, $match);

				if (empty($match[1]) || $match[1] != SMF_LANG_VERSION)
					$upcontext['upgrade_options_warning'] = 'The language files for your selected language, ' . $user_language . ', have not been updated to the latest version. Upgrade will continue with the forum default, ' . $upcontext['language'] . '.';
				elseif (!file_exists($boarddir . '/Themes/default/languages/Install.' . basename($user_language, '.lng') . '.php'))
					$upcontext['upgrade_options_warning'] = 'The language files for your selected language, ' . $user_language . ', have not been uploaded/updated as the &quot;Install&quot; language file is missing. Upgrade will continue with the forum default, ' . $upcontext['language'] . '.';
				else
				{
					// Set this as the new language.
					$upcontext['language'] = $user_language;
					$upcontext['upgrade_status']['lang'] = $upcontext['language'];

					// Include the file.
					require_once($boarddir . '/Themes/default/languages/Install.' . $user_language . '.php');
				}
			}

			// If we're resuming set the step and substep to be correct.
			if (isset($_POST['cont']))
			{
				$upcontext['current_step'] = $upcontext['user']['step'];
				$_GET['substep'] = $upcontext['user']['substep'];
			}

			return true;
		}
	}

	return false;
}

// Step 1: Do the maintenance and backup.
function UpgradeOptions()
{
	global $db_prefix, $command_line, $modSettings, $is_debug, $smcFunc;
	global $boarddir, $boardurl, $sourcedir, $maintenance, $mmessage, $cachedir, $upcontext, $db_type;

	$upcontext['sub_template'] = 'upgrade_options';
	$upcontext['page_title'] = 'Upgrade Options';

	// If we've not submitted then we're done.
	if (empty($_POST['upcont']))
		return false;

	// Firstly, if they're enabling SM stat collection just do it.
	if (!empty($_POST['stats']) && substr($boardurl, 0, 16) != 'http://localhost' && empty($modSettings['allow_sm_stats']))
	{
		// Attempt to register the site etc.
		$fp = @fsockopen('www.simplemachines.org', 80, $errno, $errstr);
		if ($fp)
		{
			$out = 'GET /smf/stats/register_stats.php?site=' . base64_encode($boardurl) . ' HTTP/1.1' . "\r\n";
			$out .= 'Host: www.simplemachines.org' . "\r\n";
			$out .= 'Connection: Close' . "\r\n\r\n";
			fwrite($fp, $out);

			$return_data = '';
			while (!feof($fp))
				$return_data .= fgets($fp, 128);

			fclose($fp);

			// Get the unique site ID.
			preg_match('~SITE-ID:\s(\w{10})~', $return_data, $ID);

			if (!empty($ID[1]))
				$smcFunc['db_insert']('replace',
					$db_prefix . 'settings',
					array('variable' => 'string', 'value' => 'string'),
					array('allow_sm_stats', $ID[1]),
					array('variable')
				);
		}
	}
	else
		$smcFunc['db_query']('', '
			DELETE FROM {db_prefix}settings
			WHERE variable = {string:allow_sm_stats}',
			array(
				'allow_sm_stats' => 'allow_sm_stats',
				'db_error_skip' => true,
			)
		);

	// Emptying the error log?
	if (!empty($_POST['empty_error']))
		$smcFunc['db_query']('truncate_table', '
			TRUNCATE {db_prefix}log_errors',
			array(
			)
		);

	$changes = array();

	// If we're overriding the language follow it through.
	if (isset($_GET['lang']) && file_exists($boarddir . '/Themes/default/languages/index.' . $_GET['lang'] . '.php'))
		$changes['language'] = '\'' . $_GET['lang'] . '\'';

	if (!empty($_POST['maint']))
	{
		$changes['maintenance'] = '2';
		// Remember what it was...
		$upcontext['user']['main'] = $maintenance;

		if (!empty($_POST['maintitle']))
		{
			$changes['mtitle'] = '\'' . addslashes($_POST['maintitle']) . '\'';
			$changes['mmessage'] = '\'' . addslashes($_POST['mainmessage']) . '\'';
		}
		else
		{
			$changes['mtitle'] = '\'Upgrading the forum...\'';
			$changes['mmessage'] = '\'Don\\\'t worry, we will be back shortly with an updated forum.  It will only be a minute ;).\'';
		}
	}

	if ($command_line)
		echo ' * Updating Settings.php...';

	// Backup the current one first.
	copy($boarddir . '/Settings.php', $boarddir . '/Settings_bak.php');

	// Fix some old paths.
	if (substr($boarddir, 0, 1) == '.')
		$changes['boarddir'] = '\'' . fixRelativePath($boarddir) . '\'';

	if (substr($sourcedir, 0, 1) == '.')
		$changes['sourcedir'] = '\'' . fixRelativePath($sourcedir) . '\'';

	if (empty($cachedir) || substr($cachedir, 0, 1) == '.')
		$changes['cachedir'] = '\'' . fixRelativePath($boarddir) . '/cache\'';

	// Not had the database type added before?
	if (empty($db_type))
		$changes['db_type'] = 'mysql';

	// @todo Maybe change the cookie name if going to 1.1, too?

	// Update Settings.php with the new settings.
	changeSettings($changes);

	if ($command_line)
		echo ' Successful.' . "\n";

	// Are we doing debug?
	if (isset($_POST['debug']))
	{
		$upcontext['upgrade_status']['debug'] = true;
		$is_debug = true;
	}

	// If we're not backing up then jump one.
	if (empty($_POST['backup']))
		$upcontext['current_step']++;

	// If we've got here then let's proceed to the next step!
	return true;
}

// Backup the database - why not...
function BackupDatabase()
{
	global $upcontext, $db_prefix, $command_line, $is_debug, $support_js, $file_steps, $smcFunc;

	$upcontext['sub_template'] = isset($_GET['xml']) ? 'backup_xml' : 'backup_database';
	$upcontext['page_title'] = 'Backup Database';

	// Done it already - js wise?
	if (!empty($_POST['backup_done']))
		return true;

	// Some useful stuff here.
	db_extend();

	// Get all the table names.
	$filter = str_replace('_', '\_', preg_match('~^`(.+?)`\.(.+?)$~', $db_prefix, $match) != 0 ? $match[2] : $db_prefix) . '%';
	$db = preg_match('~^`(.+?)`\.(.+?)$~', $db_prefix, $match) != 0 ? strtr($match[1], array('`' => '')) : false;
	$tables = $smcFunc['db_list_tables']($db, $filter);

	$table_names = array();
	foreach ($tables as $table)
		if (substr($table, 0, 7) !== 'backup_')
			$table_names[] = $table;

	$upcontext['table_count'] = count($table_names);
	$upcontext['cur_table_num'] = $_GET['substep'];
	$upcontext['cur_table_name'] = str_replace($db_prefix, '', isset($table_names[$_GET['substep']]) ? $table_names[$_GET['substep']] : $table_names[0]);
	$upcontext['step_progress'] = (int) (($upcontext['cur_table_num'] / $upcontext['table_count']) * 100);
	// For non-java auto submit...
	$file_steps = $upcontext['table_count'];

	// What ones have we already done?
	foreach ($table_names as $id => $table)
		if ($id < $_GET['substep'])
			$upcontext['previous_tables'][] = $table;

	if ($command_line)
		echo 'Backing Up Tables.';

	// If we don't support javascript we backup here.
	if (!$support_js || isset($_GET['xml']))
	{
		// Backup each table!
		for ($substep = $_GET['substep'], $n = count($table_names); $substep < $n; $substep++)
		{
			$upcontext['cur_table_name'] = str_replace($db_prefix, '', (isset($table_names[$substep + 1]) ? $table_names[$substep + 1] : $table_names[$substep]));
			$upcontext['cur_table_num'] = $substep + 1;

			$upcontext['step_progress'] = (int) (($upcontext['cur_table_num'] / $upcontext['table_count']) * 100);

			// Do we need to pause?
			nextSubstep($substep);

			backupTable($table_names[$substep]);

			// If this is XML to keep it nice for the user do one table at a time anyway!
			if (isset($_GET['xml']))
				return upgradeExit();
		}

		if ($is_debug && $command_line)
		{
			echo "\n" . ' Successful.\'' . "\n";
			flush();
		}
		$upcontext['step_progress'] = 100;

		$_GET['substep'] = 0;
		// Make sure we move on!
		return true;
	}

	// Either way next place to post will be database changes!
	$_GET['substep'] = 0;
	return false;
}

// Backup one table...
function backupTable($table)
{
	global $is_debug, $command_line, $db_prefix, $smcFunc;

	if ($is_debug && $command_line)
	{
		echo "\n" . ' +++ Backing up \"' . str_replace($db_prefix, '', $table) . '"...';
		flush();
	}

	$smcFunc['db_backup_table']($table, 'backup_' . $table);

	if ($is_debug && $command_line)
		echo ' done.';
}

// Step 2: Everything.
function DatabaseChanges()
{
	global $db_prefix, $modSettings, $command_line, $smcFunc;
	global $language, $boardurl, $sourcedir, $boarddir, $upcontext, $support_js, $db_type;

	// Have we just completed this?
	if (!empty($_POST['database_done']))
		return true;

	$upcontext['sub_template'] = isset($_GET['xml']) ? 'database_xml' : 'database_changes';
	$upcontext['page_title'] = 'Database Changes';

	// All possible files.
	// Name, <version, insert_on_complete
	$files = array(
		array('upgrade_1-0.sql', '1.1', '1.1 RC0'),
		array('upgrade_1-1.sql', '2.0', '2.0 a'),
		array('upgrade_2-0_' . $db_type . '.sql', '2.1', '2.1 dev0'),
		array('upgrade_2-1_' . $db_type . '.sql', '3.0', SMF_VERSION),
	);

	// How many files are there in total?
	if (isset($_GET['filecount']))
		$upcontext['file_count'] = (int) $_GET['filecount'];
	else
	{
		$upcontext['file_count'] = 0;
		foreach ($files as $file)
		{
			if (!isset($modSettings['smfVersion']) || $modSettings['smfVersion'] < $file[1])
				$upcontext['file_count']++;
		}
	}

	// Do each file!
	$did_not_do = count($files) - $upcontext['file_count'];
	$upcontext['step_progress'] = 0;
	$upcontext['cur_file_num'] = 0;
	foreach ($files as $file)
	{
		if ($did_not_do)
			$did_not_do--;
		else
		{
			$upcontext['cur_file_num']++;
			$upcontext['cur_file_name'] = $file[0];
			// Do we actually need to do this still?
			if (!isset($modSettings['smfVersion']) || $modSettings['smfVersion'] < $file[1])
			{
				$nextFile = parse_sql(dirname(__FILE__) . '/' . $file[0]);
				if ($nextFile)
				{
					// Only update the version of this if complete.
					$smcFunc['db_insert']('replace',
						$db_prefix . 'settings',
						array('variable' => 'string', 'value' => 'string'),
						array('smfVersion', $file[2]),
						array('variable')
					);

					$modSettings['smfVersion'] = $file[2];
				}

				// If this is XML we only do this stuff once.
				if (isset($_GET['xml']))
				{
					// Flag to move on to the next.
					$upcontext['completed_step'] = true;
					// Did we complete the whole file?
					if ($nextFile)
						$upcontext['current_debug_item_num'] = -1;
					return upgradeExit();
				}
				elseif ($support_js)
					break;
			}
			// Set the progress bar to be right as if we had - even if we hadn't...
			$upcontext['step_progress'] = ($upcontext['cur_file_num'] / $upcontext['file_count']) * 100;
		}
	}

	$_GET['substep'] = 0;
	// So the template knows we're done.
	if (!$support_js)
	{
		$upcontext['changes_complete'] = true;

		// If this is the command line we can't do any more.
		if ($command_line)
			return DeleteUpgrade();

		return true;
	}
	return false;
}

// Clean up any mods installed...
function CleanupMods()
{
	global $db_prefix, $modSettings, $upcontext, $boarddir, $sourcedir, $settings, $smcFunc, $command_line;

	// Sorry. Not supported for command line users.
	if ($command_line)
		return true;

	// Skipp…