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29 lines
813 B
PHP
29 lines
813 B
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", $domain_name) && //valid chars check
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preg_match("/^.{1,253}$/", $domain_name) && //overall length check
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preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $domain_name)); //length of each label
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}
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function checkfile($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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?>
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