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56 lines
1.5 KiB
PHP
56 lines
1.5 KiB
PHP
<?php
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/* Pi-hole: A black hole for Internet advertisements
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* (c) 2017 Pi-hole, LLC (https://pi-hole.net)
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* Network-wide ad blocking via your own hardware.
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*
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* This file is copyright under the latest version of the EUPL.
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* Please see LICENSE file for your rights under this license. */
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function is_valid_domain_name($domain_name)
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{
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return (preg_match("/^((-|_)*[a-z\d]((-|_)*[a-z\d])*(-|_)*)(\.(-|_)*([a-z\d]((-|_)*[a-z\d])*))*$/i", $domain_name) && // Valid chars check
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preg_match("/^.{1,253}$/", $domain_name) && // Overall length check
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preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name)); // Length of each label
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}
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function get_ip_type($ip)
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{
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return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) ? 4 :
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(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) ? 6 :
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0);
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}
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function checkfile($filename) {
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if(is_readable($filename))
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{
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return $filename;
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}
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else
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{
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// substitute dummy file
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return "/dev/null";
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}
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}
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// Credit: http://php.net/manual/en/function.hash-equals.php#119576
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if(!function_exists('hash_equals')) {
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function hash_equals($known_string, $user_string) {
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$ret = 0;
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if (strlen($known_string) !== strlen($user_string)) {
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$user_string = $known_string;
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$ret = 1;
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}
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$res = $known_string ^ $user_string;
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for ($i = strlen($res) - 1; $i >= 0; --$i) {
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$ret |= ord($res[$i]);
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}
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return !$ret;
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}
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}
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?>
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