From b0785d12513c45ab4d061169dee882f6e7779d50 Mon Sep 17 00:00:00 2001
From: Libor Peltan <libor.peltan@nic.cz>
Date: Thu, 26 Jan 2017 13:06:54 +0100
Subject: [PATCH] events/refresh: minimum timeout for next refresh
---
src/knot/events/handlers/refresh.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/knot/events/handlers/refresh.c b/src/knot/events/handlers/refresh.c
index 1b1d15e88a..b6befba6eb 100644
--- a/src/knot/events/handlers/refresh.c
+++ b/src/knot/events/handlers/refresh.c
@@ -78,6 +78,7 @@
#define BOOTSTRAP_MAXTIME (24*60*60)
#define BOOTSTRAP_JITTER (30)
+#define NEXT_REFRESH_MIN (2)
enum state {
REFRESH_STATE_INVALID = 0,
@@ -917,6 +918,11 @@ int event_refresh(conf_t *conf, zone_t *zone)
zone->timers.next_refresh = now + next;
}
+ /* Security: avoid flooding master. */
+ if (zone->timers.next_refresh < now + NEXT_REFRESH_MIN) {
+ zone->timers.next_refresh = now + NEXT_REFRESH_MIN;
+ }
+
/* Rechedule events. */
replan_from_timers(conf, zone);
if (updated) {
--
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