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<?php
/*
** Zabbix
** Copyright (C) 2001-2016 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 function macros like "{host.item.func()}".
*/
class CFunctionMacroParser extends CParser {
/**
* An options array.
*
* Supported options:
* '18_simple_checks' => true with support for old-style simple checks like "ftp,{$PORT}"
*
* @var array
*/
private $options = ['18_simple_checks' => false];
/**
* Parser for item keys.
*
* @var CItemkey
*/
private $item_key_parser;
/**
* Parser for trigger functions.
*
* @var CFunctionParser
*/
private $function_parser;
private $host = '';
private $item = '';
private $function = '';
/**
* @param array $options
*/
public function __construct($options = []) {
if (array_key_exists('18_simple_checks', $options)) {
$this->options['18_simple_checks'] = $options['18_simple_checks'];
}
$this->item_key_parser = new CItemKey(['18_simple_checks' => $this->options['18_simple_checks']]);
$this->function_parser = new CFunctionParser();
}
/**
* @param string $source
* @param int $pos
*
* @return int
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$this->host = '';
$this->item = '';
$this->function = '';
$p = $pos;
if (!isset($source[$p]) || $source[$p] !== '{') {
return self::PARSE_FAIL;
}
$p++;
if (!$this->parseHost($source, $p)) {
return self::PARSE_FAIL;
}
if (!isset($source[$p]) || $source[$p] !== ':') {
return self::PARSE_FAIL;
}
$p++;
$p2 = $p;
if ($this->item_key_parser->parse($source, $p) == CParser::PARSE_FAIL) {
return self::PARSE_FAIL;
}
$p += $this->item_key_parser->getLength();
// for instance, agent.ping.last(0)
if ($this->item_key_parser->getParamsNum() == 0 && isset($source[$p]) && $source[$p] == '(') {
for (; $p > $p2 && $source[$p] != '.'; $p--) {
// Code is not missing here.
}
if ($p == $p2) {
return self::PARSE_FAIL;
}
}
$p3 = $p;
if (!isset($source[$p]) || $source[$p] !== '.') {
return self::PARSE_FAIL;
}
$p++;
if ($this->function_parser->parse($source, $p) == CParser::PARSE_FAIL) {
return self::PARSE_FAIL;
}
$p += $this->function_parser->getLength();
if (!isset($source[$p]) || $source[$p] !== '}') {
return self::PARSE_FAIL;
}
$p++;
$this->length = $p - $pos;
$this->match = substr($source, $pos, $this->length);
$this->host = substr($source, $pos + 1, $p2 - $pos - 2);
$this->item = substr($source, $p2, $p3 - $p2);
$this->function = $this->function_parser->getMatch();
return (isset($source[$pos + $this->length]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS);
}
/**
* Parses a host in a trigger function macro constant and moves a position ($pos) on a next symbol after the host.
*
* @param string $source
* @param int $pos
*
* @return bool
*/
protected function parseHost($source, &$pos) {
$p = $pos;
for (; isset($source[$p]) && $this->isHostChar($source[$p]); $p++) {
// Code is not missing here.
}
// is host empty?
if ($p == $pos) {
return false;
}
$pos = $p;
return true;
}
/**
* Returns true if the char is allowed in the host name, false otherwise.
*
* @param string $c
*
* @return bool
*/
protected function isHostChar($c) {
return (($c >= 'a' && $c <= 'z') || ($c >= 'A' && $c <= 'Z') || ($c >= '0' && $c <= '9')
|| $c == '.' || $c == ' ' || $c == '_' || $c == '-');
}
/**
* Returns parsed host.
*
* @return string
*/
public function getHost() {
return $this->host;
}
/**
* Returns parsed item.
*
* @return string
*/
public function getItem() {
return $this->item;
}
/**
* Returns parsed function.
*
* @return string
*/
public function getFunction() {
return $this->function;
}
}
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