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/* Copyright (C) 2019 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/events/replan.h"
#define TIME_CANCEL 0
#define TIME_IGNORE (-1)
/*!
* \brief Move DDNS queue from old zone to new zone and replan if necessary.
*
* New zone will contain references from the old zone. New zone will free
* the data.
*/
static void replan_ddns(zone_t *zone, zone_t *old_zone)
{
assert(zone);
assert(old_zone);
if (old_zone->ddns_queue_size == 0) {
return;
}
ptrnode_t *node;
WALK_LIST(node, old_zone->ddns_queue) {
ptrlist_add(&zone->ddns_queue, node->d, NULL);
}
zone->ddns_queue_size = old_zone->ddns_queue_size;
ptrlist_free(&old_zone->ddns_queue, NULL);
zone_events_schedule_now(zone, ZONE_EVENT_UPDATE);
}
/*!
* \brief Replan NOTIFY event if it was queued for the old zone.
*/
static void replan_notify(zone_t *zone, const zone_t *old_zone)
{
assert(zone);
assert(old_zone);
time_t notify = zone_events_get_time(old_zone, ZONE_EVENT_NOTIFY);
if (notify > 0) {
zone_events_schedule_at(zone, ZONE_EVENT_NOTIFY, notify);
}
}
/*!
* \brief Replan DNSSEC if automatic signing enabled.
*
* This is required as the configuration could have changed.
*/
static void replan_dnssec(conf_t *conf, zone_t *zone)
{
assert(conf);
assert(zone);
conf_val_t val = conf_zone_get(conf, C_DNSSEC_SIGNING, zone->name);
if (conf_bool(&val)) {
zone_events_schedule_now(zone, ZONE_EVENT_DNSSEC);
}
}
static bool can_expire(const zone_t *zone)
{
return zone->timers.soa_expire > 0 && !zone_expired(zone);
}
/*!
* \brief Replan events that depend on zone timers (REFRESH, EXPIRE, FLUSH, RESALT, PARENT DS QUERY).
*/
void replan_from_timers(conf_t *conf, zone_t *zone)
{
assert(conf);
assert(zone);
time_t now = time(NULL);
time_t refresh = TIME_CANCEL;
if (zone_is_slave(conf, zone)) {
refresh = zone->timers.next_refresh;
assert(refresh > 0);
}
time_t expire_pre = TIME_IGNORE;
time_t expire = TIME_IGNORE;
if (zone_is_slave(conf, zone) && can_expire(zone)) {
expire_pre = TIME_CANCEL;
expire = zone->timers.last_refresh + zone->timers.soa_expire;
}
time_t flush = TIME_IGNORE;
if (!zone_is_slave(conf, zone) || can_expire(zone)) {
conf_val_t val = conf_zone_get(conf, C_ZONEFILE_SYNC, zone->name);
int64_t sync_timeout = conf_int(&val);
if (sync_timeout > 0) {
flush = zone->timers.last_flush + sync_timeout;
}
}
time_t resalt = TIME_CANCEL;
time_t ds_check = TIME_CANCEL;
time_t ds_push = TIME_CANCEL;
conf_val_t val = conf_zone_get(conf, C_DNSSEC_SIGNING, zone->name);
if (conf_bool(&val)) {
conf_val_t policy = conf_zone_get(conf, C_DNSSEC_POLICY, zone->name);
conf_id_fix_default(&policy);
val = conf_id_get(conf, C_POLICY, C_NSEC3, &policy);
if (conf_bool(&val)) {
if (zone->timers.last_resalt == 0) {
resalt = now;
} else {
val = conf_id_get(conf, C_POLICY, C_NSEC3_SALT_LIFETIME, &policy);
resalt = zone->timers.last_resalt + conf_int(&val);
}
}
ds_check = zone->timers.next_ds_check;
if (ds_check == 0) {
ds_check = TIME_IGNORE;
}
ds_push = zone->timers.next_ds_push;
if (ds_push == 0) {
ds_push = TIME_IGNORE;
}
}
zone_events_schedule_at(zone,
ZONE_EVENT_REFRESH, refresh,
ZONE_EVENT_EXPIRE, expire_pre,
ZONE_EVENT_EXPIRE, expire,
ZONE_EVENT_FLUSH, flush,
ZONE_EVENT_NSEC3RESALT, resalt,
ZONE_EVENT_DS_CHECK, ds_check,
ZONE_EVENT_DS_PUSH, ds_push);
}
void replan_load_new(zone_t *zone)
{
// enqueue directly, make first load waitable
// other events will cascade from load
zone_events_enqueue(zone, ZONE_EVENT_LOAD);
}
void replan_load_bootstrap(conf_t *conf, zone_t *zone)
{
replan_from_timers(conf, zone);
}
void replan_load_current(conf_t *conf, zone_t *zone, zone_t *old_zone)
{
replan_ddns(zone, old_zone);
replan_notify(zone, old_zone);
if (zone->contents != NULL || zone_expired(zone)) {
replan_from_timers(conf, zone);
replan_dnssec(conf, zone);
} else {
zone_events_schedule_now(zone, ZONE_EVENT_LOAD);
}
}
void replan_load_updated(zone_t *zone, zone_t *old_zone)
{
replan_ddns(zone, old_zone);
replan_notify(zone, old_zone);
// other events will cascade from load
zone_events_schedule_now(zone, ZONE_EVENT_LOAD);
}
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