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/home/vianto5/.trash/cititower.mx/wp-content/plugins/wordfence/lib/

/home/vianto5/.trash/cititower.mx/wp-content/plugins/wordfence/lib

Name	Size	Mode	Actions
dashboard/	-	0755	rm
Diff/	-	0755	rm
rest-api/	-	0755	rm
.htaccess	354	0644	edit dl rm
compat.php	425	0644	edit dl rm
Diff.php	5762	0644	edit dl rm
diffResult.php	2869	0644	edit dl rm
email_genericAlert.php	1422	0644	edit dl rm
email_newIssues.php	9035	0644	edit dl rm
email_unlockRequest.php	2397	0644	edit dl rm
email_unsubscribeRequest.php	1077	0644	edit dl rm
flags.php	6779	0644	edit dl rm
GeoLite2-Country.mmdb	6511625	0644	edit dl rm
IPTraf.php	1190	0644	edit dl rm
IPTrafList.php	3054	0644	edit dl rm
live_activity.php	580	0644	edit dl rm
menu_dashboard.php	28671	0644	edit dl rm
menu_dashboard_options.php	15577	0644	edit dl rm
menu_firewall.php	2167	0644	edit dl rm
menu_firewall_blocking.php	10495	0644	edit dl rm
menu_firewall_blocking_options.php	4737	0644	edit dl rm
menu_firewall_waf.php	20443	0644	edit dl rm
menu_firewall_waf_options.php	11357	0644	edit dl rm
menu_install.php	1767	0644	edit dl rm
menu_options.php	24631	0644	edit dl rm
menu_scanner.php	22047	0644	edit dl rm
menu_scanner_credentials.php	2774	0644	edit dl rm
menu_scanner_options.php	8615	0644	edit dl rm
menu_support.php	18194	0644	edit dl rm
menu_tools.php	1438	0644	edit dl rm
menu_tools_diagnostic.php	50481	0644	edit dl rm
menu_tools_importExport.php	1310	0644	edit dl rm
menu_tools_livetraffic.php	40381	0644	edit dl rm
menu_tools_twoFactor.php	20070	0644	edit dl rm
menu_tools_whois.php	4722	0644	edit dl rm
menu_wordfence_central.php	9889	0644	edit dl rm
noc1.key	1683	0644	edit dl rm
sodium_compat_fast.php	185	0644	edit dl rm
sysinfo.php	1496	0644	edit dl rm
viewFullActivityLog.php	1501	0644	edit dl rm
wf503.php	9860	0644	edit dl rm
wfActivityReport.php	20945	0644	edit dl rm
wfAdminNoticeQueue.php	5323	0644	edit dl rm
wfAlerts.php	7549	0644	edit dl rm
wfAPI.php	9889	0644	edit dl rm
wfArray.php	1816	0644	edit dl rm
wfBrowscap.php	3996	0644	edit dl rm
wfBrowscapCache.php	262994	0644	edit dl rm
wfBulkCountries.php	10002	0644	edit dl rm
wfCache.php	6166	0644	edit dl rm
wfCentralAPI.php	25502	0644	edit dl rm
wfConfig.php	90755	0644	edit dl rm
wfCrawl.php	6722	0644	edit dl rm
wfCredentialsController.php	5284	0644	edit dl rm
wfCrypt.php	4146	0644	edit dl rm
wfCurlInterceptor.php	1047	0644	edit dl rm
wfDashboard.php	8399	0644	edit dl rm
wfDateLocalization.php	360582	0644	edit dl rm
wfDB.php	11764	0644	edit dl rm
wfDeactivationOption.php	2184	0644	edit dl rm
wfDiagnostic.php	67805	0644	edit dl rm
wfDict.php	738	0644	edit dl rm
wfDirectoryIterator.php	1937	0644	edit dl rm
wfFileUtils.php	2784	0644	edit dl rm
wfHelperBin.php	2015	0644	edit dl rm
wfHelperString.php	2180	0644	edit dl rm
wfImportExportController.php	3306	0644	edit dl rm
wfInaccessibleDirectoryException.php	303	0644	edit dl rm
wfInvalidPathException.php	266	0644	edit dl rm
wfIpLocation.php	1768	0644	edit dl rm
wfIpLocator.php	2810	0644	edit dl rm
wfIPWhitelist.php	1596	0644	edit dl rm
wfIssues.php	27917	0644	edit dl rm
wfJWT.php	5455	0644	edit dl rm
wfLicense.php	10682	0644	edit dl rm
wfLockedOut.php	9959	0644	edit dl rm
wfLog.php	58396	0644	edit dl rm
WFLSPHP52Compatability.php	1303	0644	edit dl rm
wfMD5BloomFilter.php	5327	0644	edit dl rm
wfModuleController.php	754	0644	edit dl rm
wfNotification.php	6564	0644	edit dl rm
wfOnboardingController.php	8421	0644	edit dl rm
wfPersistenceController.php	798	0644	edit dl rm
wfRESTAPI.php	377	0644	edit dl rm
wfScan.php	16300	0644	edit dl rm
wfScanEngine.php	136195	0644	edit dl rm
wfScanEntrypoint.php	1070	0644	edit dl rm
wfScanFile.php	1037	0644	edit dl rm
wfScanFileLink.php	403	0644	edit dl rm
wfScanFileListItem.php	408	0644	edit dl rm
wfScanFileProperties.php	1095	0644	edit dl rm
wfScanMonitor.php	4152	0644	edit dl rm
wfScanPath.php	1817	0644	edit dl rm
wfSchema.php	10744	0644	edit dl rm
wfStyle.php	285	0644	edit dl rm
wfSupportController.php	24552	0644	edit dl rm
wfUnlockMsg.php	1163	0644	edit dl rm
wfUpdateCheck.php	27888	0644	edit dl rm
wfUtils.php	112786	0644	edit dl rm
wfVersionCheckController.php	19729	0644	edit dl rm
wfVersionSupport.php	447	0644	edit dl rm
wfView.php	2269	0644	edit dl rm
wfViewResult.php	1450	0644	edit dl rm
wfWebsite.php	1792	0644	edit dl rm
wordfenceClass.php	451606	0644	edit dl rm
wordfenceConstants.php	3216	0644	edit dl rm
wordfenceHash.php	43726	0644	edit dl rm
wordfenceScanner.php	31200	0644	edit dl rm
wordfenceURLHoover.php	18804	0644	edit dl rm

Edit: /home/vianto5/.trash/cititower.mx/wp-content/plugins/wordfence/lib/wordfenceURLHoover.php (18804B)

<?php
require_once(dirname(__FILE__) . '/wfAPI.php');
require_once(dirname(__FILE__) . '/wfArray.php');
class wordfenceURLHoover {
	private $debug = false;
	public $errorMsg = false;
	private $hostsToAdd = false;
	private $table = '';
	private $apiKey = false;
	private $wordpressVersion = false;
	private $useDB = true;
	private $hostKeys = array();
	private $hostList = array();
	public $currentHooverID = false;
	private $_foundSome = false;
	private $_excludedHosts = array();
	private $api = false;
	private $db = false;
	
	public static function standardExcludedHosts() {
		static $standardExcludedHosts = null;
		if ($standardExcludedHosts !== null) {
			return $standardExcludedHosts;
		}
		
		global $wpdb;
		$excludedHosts = array();
		if (is_multisite()) {
			$blogIDs = $wpdb->get_col("SELECT blog_id FROM {$wpdb->blogs}"); //Can't use wp_get_sites or get_sites because they return empty at 10k sites
			foreach ($blogIDs as $id) {
				$homeURL = get_home_url($id);
				$host = parse_url($homeURL, PHP_URL_HOST);
				if ($host) {
					$excludedHosts[$host] = 1;
				}
				$siteURL = get_site_url($id);
				$host = parse_url($siteURL, PHP_URL_HOST);
				if ($host) {
					$excludedHosts[$host] = 1;
				}
			}
		}
		else {
			$homeURL = wfUtils::wpHomeURL();
			$host = parse_url($homeURL, PHP_URL_HOST);
			if ($host) {
				$excludedHosts[$host] = 1;
			}
			$siteURL = wfUtils::wpSiteURL();
			$host = parse_url($siteURL, PHP_URL_HOST);
			if ($host) {
				$excludedHosts[$host] = 1;
			}
		}
		
		$standardExcludedHosts = array_keys($excludedHosts);
		return $standardExcludedHosts;
	}
	
	public function __sleep() {
		$this->writeHosts();	
		return array('debug', 'errorMsg', 'table', 'apiKey', 'wordpressVersion');
	}
	
	public function __wakeup() {
		$this->hostsToAdd = new wfArray(array('owner', 'host', 'path', 'hostKey'));
		$this->api = new wfAPI($this->apiKey, $this->wordpressVersion);
		$this->db = new wfDB();
	}
	
	public function __construct($apiKey, $wordpressVersion, $db = false, $continuation = false) {
		$this->hostsToAdd = new wfArray(array('owner', 'host', 'path', 'hostKey'));
		$this->apiKey = $apiKey;
		$this->wordpressVersion = $wordpressVersion;
		$this->api = new wfAPI($apiKey, $wordpressVersion);
		if($db){
			$this->db = $db;
		} else {
			$this->db = new wfDB();
		}
		global $wpdb;
		if(isset($wpdb)){
			$this->table = wfDB::networkTable('wfHoover');
		} else {
			$this->table = 'wp_wfHoover';
		}
		
		if (!$continuation) {
			$this->cleanup();
		}
	}
	
	public function cleanup() {
		$this->db->truncate($this->table);
	}
	
	public function hoover($id, $data, $excludedHosts = array()) {
		$this->currentHooverID = $id;
		$this->_foundSome = 0;
		$this->_excludedHosts = $excludedHosts;
		@preg_replace_callback('_((?:(?://)(?:\S+(?::\S*)?@)?(?:(?:(?:[a-z\xa1-\xff0-9.-]+)(?:\.(?:(?:xn--[a-z\xa1-\xff0-9-]+)|[a-z\xa1-\xff]{2,}))))(?::\d{2,5})?)(?:/[a-z0-9\-\_\.~\!\*;\:@&\=\+\$,\?#\[\]%]*)*)_iS', array($this, 'captureURL'), $data);
		$this->writeHosts();
		return $this->_foundSome;
	}
	
	private function dbg($msg) { 
		if ($this->debug) { wordfence::status(4, 'info', $msg); } 
	}
	
	public function captureURL($matches) {
		$id = $this->currentHooverID;
		$url = 'http:' . $matches[0];
		if (!filter_var($url, FILTER_VALIDATE_URL)) {
			return;
		}
		
		$components = parse_url($url);
		if (preg_match('/\.(xn--(?:[a-z0-9-]*)[a-z0-9]+|[a-z\xa1-\xff0-9]{2,})$/i', $components['host'], $tld)) {
			$tld = strtolower($tld[1]);
			if (strpos(wfConfig::get('tldlist', ''), '|' . $tld . '|') === false) {
				return;
			}
		}
		else {
			return;
		}
		
		foreach ($this->_excludedHosts as $h) {
			if (strcasecmp($h, $components['host']) === 0) {
				return;
			}
		}
		
		$this->_foundSome++;
		
		$host = (isset($components['host']) ? $components['host'] : '');
		$path = (isset($components['path']) && !empty($components['path']) ? $components['path'] : '/');
		$hashes = $this->_generateHashes($url);
		foreach ($hashes as $h) {
			$this->hostsToAdd->push(array('owner' => $id, 'host' => $host, 'path' => $path, 'hostKey' => wfUtils::substr($h, 0, 4)));
		}
		
		if($this->hostsToAdd->size() > 1000){ $this->writeHosts(); }
	}
	
	private function writeHosts() {
		if ($this->hostsToAdd->size() < 1) { return; }
		if ($this->useDB) {
			$sql = "INSERT INTO " . $this->table . " (owner, host, path, hostKey) VALUES ";
			while ($elem = $this->hostsToAdd->shift()) {
				//This may be an issue for hyperDB or other abstraction layers, but leaving it for now.
				$sql .= sprintf("('%s', '%s', '%s', '%s'),", 
						$this->db->realEscape($elem['owner']),
						$this->db->realEscape($elem['host']),
						$this->db->realEscape($elem['path']),
						$this->db->realEscape($elem['hostKey'])
								);
			}
			$sql = rtrim($sql, ',');
			$this->db->queryWrite($sql);
			$this->hostsToAdd->collectGarbage();
		}
		else {
			while ($elem = $this->hostsToAdd->shift()) {
				$keys = str_split($elem['hostKey'], 4);
				foreach ($keys as $k) {
					$this->hostKeys[] = $k;
				}
				$this->hostList[] = array(
					'owner' => $elem['owner'],
					'host' => $elem['host'],
					'path' => $elem['path'],
					'hostKey' => $elem['hostKey']
					);
			}
			$this->hostsToAdd->collectGarbage();
		}
	}
	public function getBaddies() {
		wordfence::status(4, 'info', __("Gathering host keys.", 'wordfence'));
		$allHostKeys = '';
		if ($this->useDB) {
			global $wpdb;
			$dbh = $wpdb->dbh;
			$useMySQLi = wfUtils::useMySQLi();
			if ($useMySQLi) { //If direct-access MySQLi is available, we use it to minimize the memory footprint instead of letting it fetch everything into an array first
				wordfence::status(4, 'info', __("Using MySQLi directly.", 'wordfence'));
				$result = $dbh->query("SELECT DISTINCT hostKey FROM {$this->table} ORDER BY hostKey ASC LIMIT 100000"); /* We limit to 100,000 prefixes since more than that cannot be reliably checked within the default max_execution_time */
				if (!is_object($result)) {
					$this->errorMsg = "Unable to query database";
					$this->dbg($this->errorMsg);
					return false;
				}
				while ($row = $result->fetch_assoc()) {
					$allHostKeys .= $row['hostKey'];
				}
			}
			else {
				$q1 = $this->db->querySelect("SELECT DISTINCT hostKey FROM {$this->table} ORDER BY hostKey ASC LIMIT 100000"); /* We limit to 100,000 prefixes since more than that cannot be reliably checked within the default max_execution_time */
				foreach ($q1 as $hRec) {
					$allHostKeys .= $hRec['hostKey'];
				}
			}
		}
		else {
			$allHostKeys = implode('', array_values(array_unique($this->hostKeys)));
		}
		
		/**
		 * Check hash prefixes first. Each one is a 4-byte binary prefix of a SHA-256 hash of the URL. The response will
		 * be a binary list of 4-byte indices; The full URL for each index should be sent in the secondary query to
		 * find the true good/bad status.
		 */
		
		$allCount = wfUtils::strlen($allHostKeys) / 4;
		if ($allCount > 0) {
			if ($this->debug) {
				$this->dbg("Checking {$allCount} hostkeys");
				for ($i = 0; $i < $allCount; $i++) {
					$key = wfUtils::substr($allHostKeys, $i * 4, 4);
					$this->dbg("Checking hostkey: " . bin2hex($key));
				}
			}
			
			wordfence::status(2, 'info', sprintf(/* translators: Number of domains. */ __("Checking %d host keys against Wordfence scanning servers.", 'wordfence'), $allCount));
			$resp = $this->api->binCall('check_host_keys', $allHostKeys);
			wordfence::status(2, 'info', __("Done host key check.", 'wordfence'));
			$this->dbg("Done host key check");

$badHostKeys = '';
			if ($resp['code'] >= 200 && $resp['code'] <= 299) {
				$this->dbg("Host key response: " . bin2hex($resp['data']));
				$dataLen = wfUtils::strlen($resp['data']);
				if ($dataLen > 0 && $dataLen % 2 == 0) {
					$this->dbg("Checking response indexes");
					for ($i = 0; $i < $dataLen; $i += 2) {
						$idx = wfUtils::array_first(unpack('n', wfUtils::substr($resp['data'], $i, 2)));
						$this->dbg("Checking index {$idx}");
						if ($idx < $allCount) {
							$prefix = wfUtils::substr($allHostKeys, $idx * 4, 4);
							$badHostKeys .= $prefix;
							$this->dbg("Got bad hostkey for record: " . bin2hex($prefix));
						}
						else {
							$this->dbg("Bad allHostKeys index: {$idx}");
							$this->errorMsg = "Bad allHostKeys index: {$idx}";
							return false;
						}
					}
				}
				else if ($dataLen > 0) {
					$this->errorMsg = "Invalid data length received from Wordfence server: " . $dataLen;
					$this->dbg($this->errorMsg);
					return false;
				}
			}
			else {
				$this->errorMsg = "Wordfence server responded with an error. HTTP code " . $resp['code'] . " and data: " . $resp['data'];
				return false;
			}
			
			$badCount = wfUtils::strlen($badHostKeys) / 4;
			if ($badCount > 0) {
				$urlsToCheck = array();
				$totalURLs = 0;
				
				//Reconcile flagged prefixes with their corresponding URLs
				for ($i = 0; $i < $badCount; $i++) {
					$prefix = wfUtils::substr($badHostKeys, $i * 4, 4);
					
					if ($this->useDB) {
						/**
						 * Putting a 10000 limit in here for sites that have a huge number of items with the same URL 
						 * that repeats. This is an edge case. But if the URLs are malicious then presumably the admin 
						 * will fix the malicious URLs and on subsequent scans the items (owners) that are above the 
						 * 10000 limit will appear.
						 */
						$q1 = $this->db->querySelect("SELECT DISTINCT owner, host, path FROM {$this->table} WHERE hostKey = %s LIMIT 10000", $prefix);
						foreach ($q1 as $rec) {
							$url = 'http://' . $rec['host'] . $rec['path'];
							if (!isset($urlsToCheck[$rec['owner']])) {
								$urlsToCheck[$rec['owner']] = array();
							}
							if (!in_array($url, $urlsToCheck[$rec['owner']])) {
								$urlsToCheck[$rec['owner']][] = $url;
								$totalURLs++;
							}
						}
					}
					else {
						foreach ($this->hostList as $rec) {
							$pos = wfUtils::strpos($rec['hostKey'], $prefix);
							if ($pos !== false && $pos % 4 == 0) {
								$url = 'http://' . $rec['host'] . $rec['path'];
								if (!isset($urlsToCheck[$rec['owner']])) {
									$urlsToCheck[$rec['owner']] = array();
								}
								if (!in_array($url, $urlsToCheck[$rec['owner']])) {
									$urlsToCheck[$rec['owner']][] = $url;
									$totalURLs++;
								}
							}
						}
					}
					if ($totalURLs > 10000) { break; }
				}

if (count($urlsToCheck) > 0) {
					wordfence::status(2, 'info', sprintf(
						/* translators: 1. Number of URLs. 2. Number of files. */
						__('Checking %1$d URLs from %2$d sources.', 'wordfence'),
						$totalURLs,
						sizeof($urlsToCheck)
					));
					$badURLs = $this->api->call('check_bad_urls', array(), array('toCheck' => json_encode($urlsToCheck)));
					wordfence::status(2, 'info', __("Done URL check.", 'wordfence'));
					$this->dbg("Done URL check");
					if (is_array($badURLs) && count($badURLs) > 0) {
						$finalResults = array();
						foreach ($badURLs as $file => $badSiteList) {
							if (!isset($finalResults[$file])) {
								$finalResults[$file] = array();
							}
							foreach ($badSiteList as $badSite) {
								$finalResults[$file][] = array(
									'URL' => $badSite[0],
									'badList' => $badSite[1]
									);
							}
						}
						$this->dbg("Confirmed " . count($badURLs) . " bad URLs");
						return $finalResults;
					}
				}
			}
		}
		
		return array();
	}
	
	protected function _generateHashes($url) {
		//The GSB specification requires generating and sending hash prefixes for a number of additional similar URLs. See: https://developers.google.com/safe-browsing/v4/urls-hashing#suffixprefix-expressions
		
		$canonicalURL = $this->_canonicalizeURL($url);
		
		//Extract the scheme
		$scheme = 'http';
		if (preg_match('~^([a-z]+[a-z0-9+\.\-]*)://(.*)$~i', $canonicalURL, $matches)) {
			$scheme = strtolower($matches[1]);
			$canonicalURL = $matches[2];
		}
		
		//Separate URL and query string
		$query = '';
		if (preg_match('/^([^?]+)(\??.*)/', $canonicalURL, $matches)) {
			$canonicalURL = $matches[1];
			$query = $matches[2];
		}
		
		//Separate host and path
		$path = '';
		preg_match('~^(.*?)(?:(/.*)|$)~', $canonicalURL, $matches);
		$host = $matches[1];
		if (isset($matches[2])) {
			$path = $matches[2];
		}
		
		//Clean host
		$host = $this->_normalizeHost($host);
		
		//Generate hosts list
		$hosts = array();
		if (filter_var(trim($host, '[]'), FILTER_VALIDATE_IP)) {
			$hosts[] = $host;
		}
		else {
			$hostComponents = explode('.', $host);
			
			$numComponents = count($hostComponents) - 7;
			if ($numComponents < 1) {
				$numComponents = 1;
			}
			
			$hosts[] = $host;
			for ($i = $numComponents; $i < count($hostComponents) - 1; $i++) {
				$hosts[] = implode('.', array_slice($hostComponents, $i));
			}
		}
		
		//Generate paths list
		$paths = array('/');
		$pathComponents = array_filter(explode('/', $path));
		
		$numComponents = min(count($pathComponents), 4);
		for ($i = 1; $i < $numComponents; $i++) {
			$paths[] = '/' . implode('/', array_slice($pathComponents, 0, $i)) . '/';
		}
		if ($path != '/') {
			$paths[] = $path;
		}
		if (strlen($query) > 0) {
			$paths[] = $path . '?' . $query;
		}
		$paths = array_reverse($paths); //So we start at the most specific and move to most generic
		
		//Generate hashes
		$hashes = array();
		foreach ($hosts as $h) {
			$hashes[$h] = hash('sha256', $h, true); //WFSB compatibility -- it uses hashes without the path
			foreach ($paths as $p) {
				$key = $h . $p;
				$hashes[$key] = hash('sha256', $key, true);
				break; //We no longer have any use for the extra path variants, so just include the primary one and exit the loop after
			}
		}
		
		return $hashes;
	}
	
	protected function _canonicalizeURL($url) { //Based on https://developers.google.com/safe-browsing/v4/urls-hashing#canonicalization and Google's reference implementation https://github.com/google/safebrowsing/blob/master/urls.go
		//Strip fragment
		$url = $this->_array_first(explode('#', $url));
		
		//Trim space
		$url = trim($url);
		
		//Remove tabs, CR, LF
		$url = preg_replace('/[\t\n\r]/', '', $url);
		
		//Normalize escapes
		$url = $this->_normalizeEscape($url);
		if ($url === false) { return false; }
		
		//Extract the scheme
		$scheme = 'http';
		if (preg_match('~^([a-z]+[a-z0-9+\.\-]*)://(.*)$~i', $url, $matches)) {
			$scheme = strtolower($matches[1]);
			$url = $matches[2];
		}
		
		//Separate URL and query string
		$query = '';
		if (preg_match('/^([^?]+)(\??.*)/', $url, $matches)) {
			$url = $matches[1];
			$query = $matches[2];
		}
		$endsWithSlash = substr($url, -1) == '/';
		
		//Separate host and path
		$path = '';
		preg_match('~^(.*?)(?:(/.*)|$)~', $url, $matches);
		$host = $matches[1];
		if (isset($matches[2])) {
			$path = $matches[2];
		}
		
		//Clean host
		$host = $this->_normalizeHost($host);
		if ($host === false) { return false; }
		
		//Clean path
		$path = preg_replace('~//+~', '/', $path); //Multiple slashes -> single slash
		$path = preg_replace('~(?:^|/)\.(?:$|/)~', '/', $path); //. path components removed
		while (preg_match('~/(?!\.\./)[^/]+/\.\.(?:$|/)~', $path)) { //Resolve ..
			$path = preg_replace('~/(?!\.\./)[^/]+/\.\.(?:$|/)~', '/', $path, 1);
		}
		$path = preg_replace('~(?:^|/)\.\.(?:$|/)~', '/', $path); //Eliminate .. at the beginning
		$path = trim($path, '.');
		$path = preg_replace('/\.\.+/', '.', $path);
		
		if ($path == '.' || $path == '') {
			$path = '/';
		}
		else if ($endsWithSlash && substr($path, -1) != '/') {
			$path .= '/';
		}
		
		return $scheme . '://' . $host . $path . $query;
	}
	
	protected function _normalizeEscape($url) {
		$maxDepth = 1024;
		$i = 0;
		while (preg_match('/%([0-9a-f]{2})/i', $url)) {
			$url = preg_replace_callback('/%([0-9a-f]{2})/i', array($this, '_hex2binCallback'), $url);
			$i++;
			
			if ($i > $maxDepth) {
				return false;
			}
		}
		
		return preg_replace_callback('/[\x00-\x20\x7f-\xff#%]/', array($this, '_bin2hexCallback'), $url);
	}
	
	protected function _hex2binCallback($matches) {
		return wfUtils::hex2bin($matches[1]);
	}

protected function _bin2hexCallback($matches) {
		return '%' . bin2hex($matches[0]);	
	}
	
	protected function _normalizeHost($host) {
		//Strip username:password
		$host = $this->_array_last(explode('@', $host));
		
		//IPv6 literal
		if (substr($host, 0, 1) == '[') {
			if (strpos($host, ']') === false) { //No closing bracket
				return false;
			}
		}
		
		//Strip port
		$host = preg_replace('/:\d+$/', '', $host);
		
		//Unicode to IDNA
		$u = rawurldecode($host);
		if (preg_match('/[\x81-\xff]/', $u)) { //0x80 is technically Unicode, but the GSB canonicalization doesn't consider it one
			if (function_exists('idn_to_ascii')) { //Some PHP versions don't have this and we don't have a polyfill
				$host = idn_to_ascii($u);
			}
		}
		
		//Remove extra dots
		$host = trim($host, '.');
		$host = preg_replace('/\.\.+/', '.', $host);
		
		//Canonicalize IP addresses
		if ($iphost = $this->_parseIP($host)) {
			return $iphost;
		}
		
		return strtolower($host);
	}
	
	protected function _parseIP($host) {
		// The Windows resolver allows a 4-part dotted decimal IP address to have a
		// space followed by any old rubbish, so long as the total length of the
		// string doesn't get above 15 characters. So, "10.192.95.89 xy" is
		// resolved to 10.192.95.89. If the string length is greater than 15
		// characters, e.g. "10.192.95.89 xy.wildcard.example.com", it will be
		// resolved through DNS.
		if (strlen($host) <= 15) {
			$host = $this->_array_first(explode(' ', $host));
		}
		
		if (!preg_match('/^((?:0x[0-9a-f]+|[0-9\.])+)$/i', $host)) {
			return false;
		}
		
		$parts = explode('.', $host);
		if (count($parts) > 4) {
			return false;
		}
		
		$strings = array();
		foreach ($parts as $i => $p) {
			if ($i == count($parts) - 1) {
				$strings[] = $this->_canonicalNum($p, 5 - count($parts));
			}
			else {
				$strings[] = $this->_canonicalNum($p, 1);
			}
			
			if ($strings[$i] == '') {
				return '';
			}
		}
		
		return implode('.', $strings);
	}
	
	protected function _canonicalNum($part, $n) {
		if ($n <= 0 || $n > 4) {
			return '';
		}
		
		if (preg_match('/^0x(\d+)$/i', $part, $matches)) { //hex
			$part = hexdec($matches[1]);
		}
		else if (preg_match('/^0(\d+)$/i', $part, $matches)) { //octal
			$part = octdec($matches[1]);
		}
		else {
			$part = (int) $part;
		}
		
		$strings = array_fill(0, $n, '');
		for ($i = $n - 1; $i >= 0; $i--) {
			$strings[$i] = (string) ($part & 0xff);
			$part = $part >> 8;
		}
		return implode('.', $strings);
	}
	
	protected function _array_first($array) {
		if (empty($array)) {
			return null;
		}
		
		return $array[0];
	}
	
	protected function _array_last($array) {
		if (empty($array)) {
			return null;
		}
		
		return $array[count($array) - 1];
	}
}

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