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<?php
/*
** Zabbix
** Copyright (C) 2001-2018 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.
**/
function getRegexp($regexpId) {
return DBfetch(DBselect('SELECT re.* FROM regexps re WHERE regexpid='.zbx_dbstr($regexpId)));
}
function getRegexpExpressions($regexpId) {
$expressions = [];
$dbExpressions = DBselect(
'SELECT e.expressionid,e.expression,e.expression_type,e.exp_delimiter,e.case_sensitive'.
' FROM expressions e'.
' WHERE regexpid='.zbx_dbstr($regexpId)
);
while ($expression = DBfetch($dbExpressions)) {
$expressions[$expression['expressionid']] = $expression;
}
return $expressions;
}
function addRegexp(array $regexp, array $expressions) {
try {
// check required fields
$dbFields = ['name' => null, 'test_string' => ''];
validateRegexp($expressions);
if (!check_db_fields($dbFields, $regexp)) {
throw new Exception(_('Incorrect arguments passed to function').' [addRegexp]');
}
// check duplicate name
$sql = 'SELECT re.regexpid'.
' FROM regexps re'.
' WHERE re.name='.zbx_dbstr($regexp['name']);
if (DBfetch(DBselect($sql))) {
throw new Exception(_s('Regular expression "%s" already exists.', $regexp['name']));
}
$regexpIds = DB::insert('regexps', [$regexp]);
$regexpId = reset($regexpIds);
addRegexpExpressions($regexpId, $expressions);
}
catch (Exception $e) {
error($e->getMessage());
return false;
}
return true;
}
function updateRegexp(array $regexp, array $expressions) {
try {
$regexpId = $regexp['regexpid'];
unset($regexp['regexpid']);
validateRegexp($expressions);
// check existence
if (!getRegexp($regexpId)) {
throw new Exception(_('Regular expression does not exist.'));
}
// check required fields
$dbFields = ['name' => null];
if (!check_db_fields($dbFields, $regexp)) {
throw new Exception(_('Incorrect arguments passed to function').' [updateRegexp]');
}
// check duplicate name
$dbRegexp = DBfetch(DBselect(
'SELECT re.regexpid'.
' FROM regexps re'.
' WHERE re.name='.zbx_dbstr($regexp['name'])
));
if ($dbRegexp && bccomp($regexpId, $dbRegexp['regexpid']) != 0) {
throw new Exception(_s('Regular expression "%s" already exists.', $regexp['name']));
}
rewriteRegexpExpressions($regexpId, $expressions);
DB::update('regexps', [
'values' => $regexp,
'where' => ['regexpid' => $regexpId]
]);
}
catch (Exception $e) {
error($e->getMessage());
return false;
}
return true;
}
function validateRegexp($expressions) {
$validator = new CRegexValidator([
'messageInvalid' => _('Regular expression must be a string'),
'messageRegex' => _('Incorrect regular expression "%1$s": "%2$s"')
]);
foreach ($expressions as $expression) {
switch ($expression['expression_type']) {
case EXPRESSION_TYPE_TRUE:
case EXPRESSION_TYPE_FALSE:
if (!$validator->validate($expression['expression'])) {
throw new Exception($validator->getError());
}
break;
case EXPRESSION_TYPE_INCLUDED:
case EXPRESSION_TYPE_NOT_INCLUDED:
if ($expression['expression'] === '') {
throw new Exception(_('Expression cannot be empty'));
}
break;
case EXPRESSION_TYPE_ANY_INCLUDED:
foreach (explode($expression['exp_delimiter'], $expression['expression']) as $string) {
if ($expression['expression'] === '') {
throw new Exception(_('Expression cannot be empty'));
}
}
break;
}
}
}
/**
* Rewrite Zabbix regexp expressions.
* If all fields are equal to existing expression, that expression is not touched.
* Other expressions are removed and new ones created.
*
* @param string $regexpId
* @param array $expressions
*/
function rewriteRegexpExpressions($regexpId, array $expressions) {
$dbExpressions = getRegexpExpressions($regexpId);
$expressionsToAdd = [];
$expressionsToUpdate = [];
foreach ($expressions as $expression) {
if (!isset($expression['expressionid'])) {
$expressionsToAdd[] = $expression;
}
elseif (isset($dbExpressions[$expression['expressionid']])) {
$expressionsToUpdate[] = $expression;
unset($dbExpressions[$expression['expressionid']]);
}
}
if ($dbExpressions) {
$dbExpressionIds = zbx_objectValues($dbExpressions, 'expressionid');
deleteRegexpExpressions($dbExpressionIds);
}
if ($expressionsToAdd) {
addRegexpExpressions($regexpId, $expressionsToAdd);
}
if ($expressionsToUpdate) {
updateRegexpExpressions($expressionsToUpdate);
}
}
function addRegexpExpressions($regexpId, array $expressions) {
$dbFields = ['expression' => null, 'expression_type' => null];
foreach ($expressions as &$expression) {
if (!check_db_fields($dbFields, $expression)) {
throw new Exception(_('Incorrect arguments passed to function').' [add_expression]');
}
$expression['regexpid'] = $regexpId;
}
unset($expression);
DB::insert('expressions', $expressions);
}
function updateRegexpExpressions(array $expressions) {
foreach ($expressions as &$expression) {
$expressionId = $expression['expressionid'];
unset($expression['expressionid']);
DB::update('expressions', [
'values' => $expression,
'where' => ['expressionid' => $expressionId]
]);
}
unset($expression);
}
function deleteRegexpExpressions(array $expressionIds) {
DB::delete('expressions', ['expressionid' => $expressionIds]);
}
function expression_type2str($type = null) {
$types = [
EXPRESSION_TYPE_INCLUDED => _('Character string included'),
EXPRESSION_TYPE_ANY_INCLUDED => _('Any character string included'),
EXPRESSION_TYPE_NOT_INCLUDED => _('Character string not included'),
EXPRESSION_TYPE_TRUE => _('Result is TRUE'),
EXPRESSION_TYPE_FALSE => _('Result is FALSE')
];
if ($type === null) {
return $types;
}
elseif (isset($types[$type])) {
return $types[$type];
}
else {
return _('Unknown');
}
}
function expressionDelimiters() {
return [
',' => ',',
'.' => '.',
'/' => '/'
];
}
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