<?php

/*
 * Copyright (C) 2017 Deciso B.V.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

namespace OPNsense\Diagnostics\Api;

use OPNsense\Base\ApiControllerBase;
use OPNsense\Core\Config;
use OPNsense\Core\Backend;

/**
 * Class DnsController
 * @package OPNsense\Diagnostics
 */
class DnsController extends ApiControllerBase
{
    /**
     * perform a reverse dns lookup
     * @return array
     */
    public function reverseLookupAction()
    {
        if ($this->request->isGet() && $this->request->has('address')) {
            if (is_array($this->request->get('address'))) {
                $address = $this->request->get('address');
            } else {
                $address = array($this->request->get('address'));
            }
            $result = array();
            foreach ($address as $addr) {
                if (!empty(filter_var($addr, FILTER_VALIDATE_IP))) {
                    $result[$addr] = gethostbyaddr($addr);
                } else {
                    $result[$addr] = $addr;
                }
            }
            return $result;
        } else {
            return null;
        }
    }
}
