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173 lines
3.8 KiB
173 lines
3.8 KiB
1 year ago
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<?php
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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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 2 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, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* A parser for IPv6 address.
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*/
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class CIPv6Parser extends CParser {
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const STATE_NEW = 0;
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const STATE_AFTER_DIGITS = 1;
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const STATE_AFTER_COLON = 2;
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const STATE_AFTER_DBLCOLON = 3;
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/**
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* @var CIPv4Parser
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*/
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private $ipv4_parser;
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public function __construct() {
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$this->ipv4_parser = new CIPv4Parser();
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}
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/**
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* @param string $source
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* @param int $pos
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*
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* @return int
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*/
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public function parse($source, $pos = 0) {
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$this->length = 0;
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$this->match = '';
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$state = self::STATE_NEW;
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$colons = 0;
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$dbl_colons = 0;
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for ($p = $pos; isset($source[$p]); $p++) {
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switch ($state) {
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case self::STATE_NEW:
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if (self::parseDoubleColon($source, $p)) {
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if ($dbl_colons++ == 1) {
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return self::PARSE_FAIL;
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}
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$state = self::STATE_AFTER_DBLCOLON;
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}
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elseif (self::parseXDigits($source, $p)) {
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$state = self::STATE_AFTER_DIGITS;
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}
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else {
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return self::PARSE_FAIL;
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}
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break;
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case self::STATE_AFTER_COLON:
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if (self::parseXDigits($source, $p)) {
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$state = self::STATE_AFTER_DIGITS;
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}
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else {
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return self::PARSE_FAIL;
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}
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break;
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case self::STATE_AFTER_DBLCOLON:
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if (self::parseXDigits($source, $p)) {
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$state = self::STATE_AFTER_DIGITS;
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}
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else {
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break 2;
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}
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break;
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case self::STATE_AFTER_DIGITS:
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if (self::parseDoubleColon($source, $p)) {
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if ($dbl_colons++ == 1) {
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return self::PARSE_FAIL;
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}
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$state = self::STATE_AFTER_DBLCOLON;
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}
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elseif ($source[$p] == ':') {
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if ($colons++ == 7) {
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return self::PARSE_FAIL;
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}
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$state = self::STATE_AFTER_COLON;
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}
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else {
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break 2;
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}
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break;
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}
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}
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if ($state == self::STATE_AFTER_COLON || $state == self::STATE_NEW) {
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return self::PARSE_FAIL;
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}
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if (isset($source[$p]) && $source[$p] == '.' && $state == self::STATE_AFTER_DIGITS
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&& ($colons != 0 || $dbl_colons != 0)) {
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if (($dbl_colons == 0 && $colons != 6) || ($dbl_colons == 1 && $colons > 4)) {
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return self::PARSE_FAIL;
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}
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while ($source[$p - 1] != ':') {
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$p--;
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}
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if ($this->ipv4_parser->parse($source, $p) == self::PARSE_FAIL) {
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return self::PARSE_FAIL;
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}
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$p += $this->ipv4_parser->getLength();
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}
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elseif (($dbl_colons == 0 && $colons != 7) || ($dbl_colons == 1 && $colons > 5)) {
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return self::PARSE_FAIL;
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}
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$this->length = $p - $pos;
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$this->match = substr($source, $pos, $this->length);
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return (isset($source[$pos + $this->length]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS);
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}
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private static function parseDoubleColon($source, &$pos) {
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$p = $pos;
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if ($source[$p] !== ':') {
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return false;
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}
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$p++;
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if (!isset($source[$p]) || $source[$p] !== ':') {
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return false;
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}
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$pos = $p;
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return true;
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}
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private static function parseXDigits($source, &$pos) {
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$p = $pos;
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while (isset($source[$p]) && ctype_xdigit($source[$p])) {
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$p++;
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}
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if ($p == $pos || $p - $pos > 4) {
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return false;
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}
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$pos = $p - 1;
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return true;
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}
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}
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