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 IPv6 address.

 */

class CIPv6Parser extends CParser {

​

    const STATE_NEW = 0;

    const STATE_AFTER_DIGITS = 1;

    const STATE_AFTER_COLON = 2;

    const STATE_AFTER_DBLCOLON = 3;

​

    /**

     * @var CIPv4Parser

     */

    private $ipv4_parser;

​

    public function __construct() {

        $this->ipv4_parser = new CIPv4Parser();

    }

​

    /**

     * @param string $source

     * @param int    $pos

     *

     * @return int

     */

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

        $this->length = 0;

        $this->match = '';

​

        $state = self::STATE_NEW;

        $colons = 0;

        $dbl_colons = 0;

​

        for ($p = $pos; isset($source[$p]); $p++) {

            switch ($state) {

                case self::STATE_NEW:

                    if (self::parseDoubleColon($source, $p)) {

                        if ($dbl_colons++ == 1) {

                            return self::PARSE_FAIL;

                        }

                        $state = self::STATE_AFTER_DBLCOLON;

                    }

                    elseif (self::parseXDigits($source, $p)) {

                        $state = self::STATE_AFTER_DIGITS;

                    }

                    else {

                        return self::PARSE_FAIL;