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<?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 DNS address.
*/
class CDnsParser extends CParser {
/**
* @var array
*/
private $macro_parsers = [];
/**
* Supported options:
* 'usermacros' => true Enabled support of user macros;
* 'lldmacros' => true Enabled support of LLD macros;
* 'macros' => true Enabled support of all macros;
* 'macros' => [] Allows array with list of macros. Empty array or false means no macros supported.
*
* @var array
*/
private $options = [
'usermacros' => false,
'lldmacros' => false,
'macros' => []
];
/**
* @param array $options
*/
public function __construct(array $options = []) {
$this->options = $options + $this->options;
if ($this->options['usermacros']) {
array_push($this->macro_parsers, new CUserMacroParser, new CUserMacroFunctionParser);
}
if ($this->options['lldmacros']) {
array_push($this->macro_parsers, new CLLDMacroParser, new CLLDMacroFunctionParser);
}
if ($this->options['macros']) {
array_push($this->macro_parsers,
new CMacroParser(['macros' => $this->options['macros']]),
new CMacroFunctionParser(['macros' => $this->options['macros']])
);
}
}
/**
* @param string $source
* @param int $pos
*
* @return int
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$p = $pos;
while (isset($source[$p])) {
if (preg_match('/^[a-z0-9][a-z0-9_-]*(\.[a-z0-9_-]+)*\.?/i', substr($source, $p), $matches)) {
$p += strlen($matches[0]);
}
else {
foreach ($this->macro_parsers as $macro_parser) {
if ($macro_parser->parse($source, $p) != self::PARSE_FAIL) {
$p += $macro_parser->getLength();
continue 2;
}
}
break;
}
}
$length = $p - $pos;
if ($length == 0 || $length > 255) {
return self::PARSE_FAIL;
}
$this->length = $length;
$this->match = substr($source, $pos, $this->length);
return isset($source[$p]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;
}
}
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