+static inline bool filter_check_loop(filter_t *filter, A(filter_t) *array, int level)
+{
+ if (filter->last_seen == level) {
+ return true;
+ }
+ filter->last_seen = level;
+ foreach (filter_hook_t *hook, filter->hooks) {
+ if (hook->postfix) {
+ continue;
+ }
+ if (hook->filter_id == level) {
+ return false;
+ }
+ if (!filter_check_loop(array_ptr(*array, hook->filter_id), array, level)) {
+ return false;
+ }
+ }}
+ return true;
+}
+
+bool filter_check_safety(A(filter_t) *array)
+{
+ foreach (filter_t *filter, *array) {
+ if (!filter_check_loop(filter, array, __Ai)) {
+ syslog(LOG_ERR, "the filter tree contains a loop");
+ return false;
+ }
+ }}
+ return true;
+}
+