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<?php
/*
** Zabbix
** Copyright (C) 2001-2023 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* 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);
}
}