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62 lines
2.3 KiB
PHP
62 lines
2.3 KiB
PHP
<?php
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/**
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* Validate.php
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*
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* -Description-
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* @link https://www.librenms.org
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*
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* @copyright 2019 Tony Murray
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* @author Tony Murray <murraytony@gmail.com>
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*/
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namespace LibreNMS\Util;
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class Validate
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{
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/**
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* Checks if the give string is a valid hostname
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*
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* @param string $hostname
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* @return bool
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*/
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public static function hostname($hostname)
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{
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// The Internet standards (Request for Comments) for protocols mandate that
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// component hostname labels may contain only the ASCII letters 'a' through 'z'
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// (in a case-insensitive manner), the digits '0' through '9', and the hyphen
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// ('-'). The original specification of hostnames in RFC 952, mandated that
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// labels could not start with a digit or with a hyphen, and must not end with
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// a hyphen. However, a subsequent specification (RFC 1123) permitted hostname
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// labels to start with digits. No other symbols, punctuation characters, or
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// white space are permitted. While a hostname may not contain other characters,
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// such as the underscore character (_), other DNS names may contain the underscore
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// maximum length is 253 characters, maximum segment size is 63
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return
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preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*\.?$/i", $hostname) //valid chars check
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&& preg_match('/^.{1,253}$/', $hostname) //overall length check
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&& preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*\.?$/", $hostname);
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}
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public static function ascDesc($direction, $default = 'ASC')
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{
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return in_array(strtolower($direction), ['asc', 'desc'], true)
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? $direction
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: $default;
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}
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}
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