function validate_ticks($str)
{
// echo "Validating float:$str<br>";
if (eregi('^[ ]*#([0-9]+)((\\.)?)([0-9]*)[ ]*$', $str, $arr)) {
return 0;
} else {
return validate_float($str);
}
}
function validate_expression($expression)
{
global $ZBX_TR_EXPR_ALLOWED_MACROS, $ZBX_TR_EXPR_REPLACE_TO, $ZBX_TR_EXPR_ALLOWED_FUNCTIONS;
if (empty($expression)) {
error('Expression can\'t be empty');
}
$expr = $expression;
$h_status = array();
/* Replace all {server:key.function(param)} and {MACRO} with '$ZBX_TR_EXPR_REPLACE_TO' */
while (ereg(ZBX_EREG_EXPRESSION_TOKEN_FORMAT, $expr, $arr)) {
if ($arr[ZBX_EXPRESSION_MACRO_ID] && !isset($ZBX_TR_EXPR_ALLOWED_MACROS[$arr[ZBX_EXPRESSION_MACRO_ID]])) {
error('Unknown macro [' . $arr[ZBX_EXPRESSION_MACRO_ID] . ']');
return false;
} else {
if (!$arr[ZBX_EXPRESSION_MACRO_ID]) {
$host =& $arr[ZBX_EXPRESSION_SIMPLE_EXPRESSION_ID + ZBX_SIMPLE_EXPRESSION_HOST_ID];
$key =& $arr[ZBX_EXPRESSION_SIMPLE_EXPRESSION_ID + ZBX_SIMPLE_EXPRESSION_KEY_ID];
$function =& $arr[ZBX_EXPRESSION_SIMPLE_EXPRESSION_ID + ZBX_SIMPLE_EXPRESSION_FUNCTION_NAME_ID];
$parameter =& $arr[ZBX_EXPRESSION_SIMPLE_EXPRESSION_ID + ZBX_SIMPLE_EXPRESSION_FUNCTION_PARAM_ID];
/* Check host */
$sql = 'SELECT COUNT(*) as cnt,min(status) as status,min(hostid) as hostid ' . ' FROM hosts h ' . ' WHERE h.host=' . zbx_dbstr($host) . ' AND ' . DBin_node('h.hostid', get_current_nodeid(false)) . ' AND status IN (' . HOST_STATUS_MONITORED . ',' . HOST_STATUS_NOT_MONITORED . ',' . HOST_STATUS_TEMPLATE . ') ';
$row = DBfetch(DBselect($sql));
if ($row['cnt'] == 0) {
error('No such host (' . $host . ')');
return false;
} else {
if ($row['cnt'] != 1) {
error('Too many hosts (' . $host . ')');
return false;
}
}
$h_status[$row['status']][$row['hostid']] = $row['cnt'];
/* Check key */
$sql = 'SELECT i.itemid,i.value_type ' . ' FROM hosts h,items i ' . ' WHERE h.host=' . zbx_dbstr($host) . ' AND i.key_=' . zbx_dbstr($key) . ' AND h.hostid=i.hostid ' . ' AND ' . DBin_node('h.hostid', get_current_nodeid(false));
if (!($item = DBfetch(DBselect($sql)))) {
error('No such monitored parameter (' . $key . ') for host (' . $host . ')');
return false;
}
/* Check function */
if (!isset($ZBX_TR_EXPR_ALLOWED_FUNCTIONS[$function])) {
error('Unknown function [' . $function . ']');
return false;
}
$fnc_valid =& $ZBX_TR_EXPR_ALLOWED_FUNCTIONS[$function];
if (is_array($fnc_valid['item_types']) && !uint_in_array($item['value_type'], $fnc_valid['item_types'])) {
$allowed_types = array();
foreach ($fnc_valid['item_types'] as $type) {
$allowed_types[] = item_value_type2str($type);
}
info('Function (' . $function . ') available only for items with value types [' . implode(',', $allowed_types) . ']');
error('Incorrect value type [' . item_value_type2str($item['value_type']) . '] for function (' . $function . ') of key (' . $host . ':' . $key . ')');
return false;
}
if (!is_null($fnc_valid['args'])) {
$parameter = zbx_get_params($parameter);
if (!is_array($fnc_valid['args'])) {
$fnc_valid['args'] = array($fnc_valid['args']);
}
foreach ($fnc_valid['args'] as $pid => $params) {
if (!isset($parameter[$pid])) {
if (!isset($params['mandat'])) {
continue;
} else {
error('Missed mandatory parameter for function (' . $function . ')');
return false;
}
}
if ('sec' == $params['type'] && validate_float($parameter[$pid]) != 0) {
error('[' . $parameter[$pid] . '] is not a float for function (' . $function . ')');
return false;
}
if ('sec_num' == $params['type'] && validate_ticks($parameter[$pid]) != 0) {
error('[' . $parameter[$pid] . '] is not a float or counter for function (' . $function . ')');
return false;
}
}
}
}
}
$expr = $arr[ZBX_EXPRESSION_LEFT_ID] . $ZBX_TR_EXPR_REPLACE_TO . $arr[ZBX_EXPRESSION_RIGHT_ID];
}
if (isset($h_status[HOST_STATUS_TEMPLATE]) && (count($h_status) > 1 || count($h_status[HOST_STATUS_TEMPLATE]) > 1)) {
error("Incorrect trigger expression. You can't use template hosts" . " in mixed expressions.");
return false;
}
/* Replace all calculations and numbers with '$ZBX_TR_EXPR_REPLACE_TO' */
$expt_number = '(' . $ZBX_TR_EXPR_REPLACE_TO . '|' . ZBX_EREG_NUMBER . ')';
$expt_term = '((\\(' . $expt_number . '\\))|(' . $expt_number . '))';
$expr_format = '((' . $expt_term . ZBX_EREG_SPACES . ZBX_EREG_SIGN . ZBX_EREG_SPACES . $expt_term . ')|(\\(' . $expt_term . '\\)))';
$expr_full_format = '((\\(' . $expr_format . '\\))|(' . $expr_format . '))';
while ($res = ereg($expr_full_format . '([[:print:]]*)$', $expr, $arr)) {
$expr = substr($expr, 0, strpos($expr, $arr[1])) . $ZBX_TR_EXPR_REPLACE_TO . $arr[58];
}
if ($ZBX_TR_EXPR_REPLACE_TO != $expr) {
error('Incorrect trigger expression. [' . str_replace($ZBX_TR_EXPR_REPLACE_TO, ' ... ', $expr) . ']');
return false;
}
return true;
}
function validate_percent_over($number)
{
$safe_number = validate_float($number);
$safe_number = abs($safe_number);
return $safe_number;
}