1 files changed, 51 insertions, 0 deletions
diff --git a/src/knot/dnssec/policy.c b/src/knot/dnssec/policy.c
new file mode 100644
index 0000000..2589ae6
--- /dev/null
+++ b/src/knot/dnssec/policy.c
@@ -0,0 +1,51 @@
+/*  Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+
+#include "knot/dnssec/policy.h"
+#include "libknot/rrtype/soa.h"
+
+static uint32_t zone_soa_ttl(const zone_contents_t *zone)
+{
+	knot_rrset_t soa = node_rrset(zone->apex, KNOT_RRTYPE_SOA);
+	return soa.ttl;
+}
+
+void update_policy_from_zone(knot_kasp_policy_t *policy,
+                             const zone_contents_t *zone)
+{
+	assert(policy);
+	assert(zone);
+
+	if (policy->dnskey_ttl == UINT32_MAX) {
+		policy->dnskey_ttl = zone_soa_ttl(zone);
+	}
+	if (policy->saved_key_ttl == 0) { // possibly not set yet
+		policy->saved_key_ttl = policy->dnskey_ttl;
+	}
+
+	if (policy->zone_maximal_ttl == UINT32_MAX) {
+		policy->zone_maximal_ttl = zone->max_ttl;
+		if (policy->rrsig_refresh_before == UINT32_MAX) {
+			policy->rrsig_refresh_before = policy->propagation_delay +
+			                               policy->zone_maximal_ttl;
+		}
+	}
+	if (policy->saved_max_ttl == 0) { // possibly not set yet
+		policy->saved_max_ttl = policy->zone_maximal_ttl;
+	}
+}