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/* Copyright (C) 2021 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 <stdlib.h>
#include "knot/journal/journal_metadata.h"
#include "knot/zone/zonedb.h"
#include "libknot/packet/wire.h"
#include "contrib/mempattern.h"
#include "contrib/ucw/mempool.h"
/*! \brief Discard zone in zone database. */
static void discard_zone(zone_t *zone, bool abort_txn)
{
// Don't flush if removed zone (no previous configuration available).
if (conf_rawid_exists(conf(), C_ZONE, zone->name, knot_dname_size(zone->name)) ||
catalog_has_member(conf()->catalog, zone->name)) {
uint32_t journal_serial, zone_serial = zone_contents_serial(zone->contents);
bool exists;
// Flush if bootstrapped or if the journal doesn't exist.
if (!zone->zonefile.exists || journal_info(
zone_journal(zone), &exists, NULL, NULL, &journal_serial, NULL, NULL, NULL, NULL
) != KNOT_EOK || !exists || journal_serial != zone_serial) {
zone_flush_journal(conf(), zone, false);
}
}
if (abort_txn) {
zone_control_clear(zone);
}
zone_free(&zone);
}
knot_zonedb_t *knot_zonedb_new(void)
{
knot_zonedb_t *db = calloc(1, sizeof(knot_zonedb_t));
if (db == NULL) {
return NULL;
}
mm_ctx_mempool(&db->mm, MM_DEFAULT_BLKSIZE);
db->trie = trie_create(&db->mm);
if (db->trie == NULL) {
mp_delete(db->mm.ctx);
free(db);
return NULL;
}
return db;
}
int knot_zonedb_insert(knot_zonedb_t *db, zone_t *zone)
{
if (db == NULL || zone == NULL) {
return KNOT_EINVAL;
}
assert(zone->name);
knot_dname_storage_t lf_storage;
uint8_t *lf = knot_dname_lf(zone->name, lf_storage);
assert(lf);
*trie_get_ins(db->trie, lf + 1, *lf) = zone;
return KNOT_EOK;
}
int knot_zonedb_del(knot_zonedb_t *db, const knot_dname_t *zone_name)
{
if (db == NULL || zone_name == NULL) {
return KNOT_EINVAL;
}
knot_dname_storage_t lf_storage;
uint8_t *lf = knot_dname_lf(zone_name, lf_storage);
assert(lf);
trie_val_t *rval = trie_get_try(db->trie, lf + 1, *lf);
if (rval == NULL) {
return KNOT_ENOENT;
}
return trie_del(db->trie, lf + 1, *lf, NULL);
}
zone_t *knot_zonedb_find(knot_zonedb_t *db, const knot_dname_t *zone_name)
{
if (db == NULL) {
return NULL;
}
knot_dname_storage_t lf_storage;
uint8_t *lf = knot_dname_lf(zone_name, lf_storage);
assert(lf);
trie_val_t *val = trie_get_try(db->trie, lf + 1, *lf);
if (val == NULL) {
return NULL;
}
return *val;
}
zone_t **knot_zonedb_find_ptr(knot_zonedb_t *db, const knot_dname_t *zone_name)
{
if (db == NULL) {
return NULL;
}
knot_dname_storage_t lf_storage;
uint8_t *lf = knot_dname_lf(zone_name, lf_storage);
assert(lf);
trie_val_t *val = trie_get_try(db->trie, lf + 1, *lf);
if (val == NULL) {
return NULL;
}
return (zone_t **)val;
}
zone_t *knot_zonedb_find_suffix(knot_zonedb_t *db, const knot_dname_t *zone_name)
{
if (db == NULL || zone_name == NULL) {
return NULL;
}
while (true) {
knot_dname_storage_t lf_storage;
uint8_t *lf = knot_dname_lf(zone_name, lf_storage);
assert(lf);
trie_val_t *val = trie_get_try(db->trie, lf + 1, *lf);
if (val != NULL) {
return *val;
} else if (zone_name[0] == 0) {
return NULL;
}
zone_name = knot_wire_next_label(zone_name, NULL);
}
}
size_t knot_zonedb_size(const knot_zonedb_t *db)
{
if (db == NULL) {
return 0;
}
return trie_weight(db->trie);
}
void knot_zonedb_free(knot_zonedb_t **db)
{
if (db == NULL || *db == NULL) {
return;
}
mp_delete((*db)->mm.ctx);
free(*db);
*db = NULL;
}
void knot_zonedb_deep_free(knot_zonedb_t **db, bool abort_txn)
{
if (db == NULL || *db == NULL) {
return;
}
knot_zonedb_foreach(*db, discard_zone, abort_txn);
knot_zonedb_free(db);
}
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