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/* 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;
}
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