1 files changed, 71 insertions, 0 deletions
diff --git a/src/knot/events/handlers/backup.c b/src/knot/events/handlers/backup.c
new file mode 100644
index 0000000..a6b258c
--- /dev/null
+++ b/src/knot/events/handlers/backup.c
@@ -0,0 +1,71 @@
+/*  Copyright (C) 2020 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 <urcu.h>
+
+#include "knot/common/log.h"
+#include "knot/conf/conf.h"
+#include "knot/events/handlers.h"
+#include "knot/zone/backup.h"
+
+int event_backup(conf_t *conf, zone_t *zone)
+{
+	assert(zone);
+
+	zone_backup_ctx_t *ctx = zone->backup_ctx;
+	if (ctx == NULL) {
+		return KNOT_EINVAL;
+	}
+
+	bool restore = ctx->restore_mode;
+
+	if (!restore && ctx->failed) {
+		// No need to proceed with already faulty backup.
+		return KNOT_EOK;
+	}
+
+	char *back_dir = strdup(ctx->backup_dir);
+	if (back_dir == NULL) {
+		 return KNOT_ENOMEM;
+	}
+
+	if (restore) {
+		// expire zone
+		zone_contents_t *expired = zone_switch_contents(zone, NULL);
+		synchronize_rcu();
+		knot_sem_wait(&zone->cow_lock);
+		zone_contents_deep_free(expired);
+		knot_sem_post(&zone->cow_lock);
+		zone->zonefile.exists = false;
+	}
+
+	int ret = zone_backup(conf, zone);
+	if (ret == KNOT_EOK) {
+		log_zone_info(zone->name, "zone %s '%s'",
+		              restore ? "restored from" : "backed up to", back_dir);
+	} else {
+		log_zone_warning(zone->name, "zone %s failed (%s)",
+		                 restore ? "restore" : "backup", knot_strerror(ret));
+	}
+
+	if (restore && ret == KNOT_EOK) {
+		zone_reset(conf, zone);
+	}
+
+	free(back_dir);
+	return ret;
+}