Zabbix

<?php

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

​

/**

 * A parser for IPv4 address.

 */

class CIPv4Parser extends CParser {

​

    /**

     * @param string $source

     * @param int    $pos

     *

     * @return int

     */

    public function parse($source, $pos = 0) {

        $this->length = 0;

        $this->match = '';

​

        if (!preg_match('/^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/', substr($source, $pos), $matches)) {

            return self::PARSE_FAIL;

        }

​

        for ($i = 1; $i <= 4; $i++) {

            if (strlen($matches[$i]) > 3 || $matches[$i] > 255) {

                return self::PARSE_FAIL;

            }

        }

​

        $this->match = $matches[0];

        $this->length = strlen($this->match);

​

        return (isset($source[$pos + $this->length]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS);

    }

}