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<?php |
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/** |
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* This file is part of the Shieldon package. |
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* |
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* (c) Terry L. <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* php version 7.1.0 |
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* |
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* @category Web-security |
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* @package Shieldon |
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* @author Terry Lin <[email protected]> |
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* @copyright 2019 terrylinooo |
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* @license https://github.com/terrylinooo/shieldon/blob/2.x/LICENSE MIT |
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* @link https://github.com/terrylinooo/shieldon |
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* @see https://shieldon.io |
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*/ |
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declare(strict_types=1); |
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namespace Shieldon\Firewall\Component; |
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use Shieldon\Firewall\Component\ComponentProvider; |
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use Shieldon\Firewall\Component\DeniedTrait; |
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use Shieldon\Firewall\IpTrait; |
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use function gethostbyname; |
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use function implode; |
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use function preg_match; |
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/** |
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* Rdns component. |
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*/ |
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class Rdns extends ComponentProvider |
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{ |
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/** |
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* Public methods | Desctiotion |
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* ----------------------|--------------------------------------------- |
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* setIp | Set an IP address. |
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* getIp | Get current set IP. |
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* setRdns | Set a RDNS record for the check. |
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* getRdns | Get IP resolved hostname. |
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* ----------------------|--------------------------------------------- |
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*/ |
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use IpTrait; |
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/** |
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* Public methods | Desctiotion |
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* ----------------------|--------------------------------------------- |
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* setDeniedItems | Add items to the blacklist pool. |
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* setDeniedItem | Add an item to the blacklist pool. |
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* getDeniedItems | Get items from the blacklist pool. |
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* getDeniedItem | Get items from the blacklist pool. |
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* removeDeniedItem | Remove a denied item if exists. |
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* removeDeniedItems | Remove all denied items. |
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* hasDeniedItem | Check if a denied item exists. |
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* getDenyWithPrefix | Check if a denied item exists have the same prefix. |
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* removeDenyWithPrefix | Remove denied items with the same prefix. |
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* isDenied | Check if an item is denied? |
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* ----------------------|--------------------------------------------- |
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*/ |
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use DeniedTrait; |
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/** |
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* Constant |
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*/ |
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const STATUS_CODE = 82; |
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/** |
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* Constructor. |
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*/ |
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112 |
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public function __construct() |
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{ |
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// RDNS for robot's IP address. |
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112 |
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$this->deniedList = [ |
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112 |
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'unknown_1' => '.webcrawler.link', |
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112 |
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]; |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @return bool |
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*/ |
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public function isDenied(): bool |
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{ |
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if (!empty($this->deniedList)) { |
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if (preg_match('/(' . implode('|', $this->deniedList). ')/i', $this->rdns)) { |
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1 |
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return true; |
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} |
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} |
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if ($this->strictMode) { |
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// If strict mode is on, this value can not be empty. |
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if (empty($this->rdns)) { |
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3 |
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return true; |
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1 |
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} |
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// If the RDNS is an IP adress, not a FQDN. |
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if ($this->ip === $this->rdns) { |
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return true; |
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1 |
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} |
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// confirm hostname's IP again |
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$ip = gethostbyname($this->rdns); |
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2 |
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// If the IP is different as hostname's resolved IP. |
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if ($ip !== $this->ip) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Unique deny status code. |
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* |
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* @return int |
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*/ |
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public function getDenyStatusCode(): int |
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{ |
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return self::STATUS_CODE; |
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1 |
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} |
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} |
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terrylinooo /
shieldon
