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/* Copyright (C) 2023 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 "knot/common/log.h"
#include "knot/journal/journal_metadata.h"
#include "knot/journal/journal_read.h"
#include "knot/zone/zone-diff.h"
#include "knot/zone/zone-load.h"
#include "knot/zone/zonefile.h"
#include "knot/dnssec/key-events.h"
#include "knot/dnssec/zone-events.h"
#include "libknot/libknot.h"
int zone_load_contents(conf_t *conf, const knot_dname_t *zone_name,
zone_contents_t **contents, semcheck_optional_t semcheck_mode,
bool fail_on_warning)
{
if (conf == NULL || zone_name == NULL || contents == NULL) {
return KNOT_EINVAL;
}
char *zonefile = conf_zonefile(conf, zone_name);
zloader_t zl;
int ret = zonefile_open(&zl, zonefile, zone_name, semcheck_mode, time(NULL));
free(zonefile);
if (ret != KNOT_EOK) {
return ret;
}
sem_handler_t handler = {
.cb = err_handler_logger
};
zl.err_handler = &handler;
zl.creator->master = !zone_load_can_bootstrap(conf, zone_name);
*contents = zonefile_load(&zl);
zonefile_close(&zl);
if (*contents == NULL) {
return KNOT_ERROR;
}
if (handler.warning && fail_on_warning) {
zone_contents_deep_free(*contents);
*contents = NULL;
return KNOT_ESEMCHECK;
}
return KNOT_EOK;
}
static int apply_one_cb(bool remove, const knot_rrset_t *rr, void *ctx)
{
zone_node_t *unused = NULL;
zone_contents_t *contents = ctx;
int ret = remove ? zone_contents_remove_rr(contents, rr, &unused)
: zone_contents_add_rr(contents, rr, &unused);
if (ret == KNOT_ENOENT && remove && knot_rrtype_is_dnssec(rr->type)) {
// Compatibility with imperfect journal contents (versions < 2.9) if
// 'zonefile-load: difference' and 'dnssec-signing: on`.
// Journal history can contain a changeset with removed DNSSEC records
// which are not present in the zonefile.
return KNOT_EOK;
} else {
return ret;
}
}
int zone_load_journal(conf_t *conf, zone_t *zone, zone_contents_t *contents)
{
if (conf == NULL || zone == NULL) {
return KNOT_EINVAL;
}
// Check if journal is used (later in zone_changes_load() and zone is not empty.
if (zone_contents_is_empty(contents)) {
return KNOT_EOK;
}
uint32_t serial = zone_contents_serial(contents);
journal_read_t *read = NULL;
int ret = journal_read_begin(zone_journal(zone), false, serial, &read);
switch (ret) {
case KNOT_EOK:
break;
case KNOT_ENOENT:
return KNOT_EOK;
default:
return ret;
}
ret = journal_read_rrsets(read, apply_one_cb, contents);
if (ret == KNOT_EOK) {
log_zone_info(zone->name, "changes from journal applied, serial %u -> %u",
serial, zone_contents_serial(contents));
} else {
log_zone_error(zone->name, "failed to apply journal changes, serial %u -> %u (%s)",
serial, zone_contents_serial(contents),
knot_strerror(ret));
}
return ret;
}
int zone_load_from_journal(conf_t *conf, zone_t *zone, zone_contents_t **contents)
{
if (conf == NULL || zone == NULL || contents == NULL) {
return KNOT_EINVAL;
}
*contents = zone_contents_new(zone->name, true);
if (*contents == NULL) {
return KNOT_ENOMEM;
}
journal_read_t *read = NULL;
int ret = journal_read_begin(zone_journal(zone), true, 0, &read);
if (ret == KNOT_ENOENT) {
zone_contents_deep_free(*contents);
*contents = NULL;
return ret;
}
knot_rrset_t rr = { 0 };
while (ret == KNOT_EOK && journal_read_rrset(read, &rr, false)) {
zone_node_t *unused = NULL;
ret = zone_contents_add_rr(*contents, &rr, &unused);
journal_read_clear_rrset(&rr);
}
if (ret == KNOT_EOK) {
ret = journal_read_rrsets(read, apply_one_cb, *contents);
} else {
journal_read_end(read);
}
if (ret == KNOT_EOK) {
log_zone_info(zone->name, "zone loaded from journal, serial %u",
zone_contents_serial(*contents));
} else {
log_zone_error(zone->name, "failed to load zone from journal, serial %u (%s)",
zone_contents_serial(*contents), knot_strerror(ret));
zone_contents_deep_free(*contents);
*contents = NULL;
}
return ret;
}
bool zone_load_can_bootstrap(conf_t *conf, const knot_dname_t *zone_name)
{
if (conf == NULL || zone_name == NULL) {
return false;
}
conf_val_t val = conf_zone_get(conf, C_MASTER, zone_name);
size_t count = conf_val_count(&val);
return count > 0;
}
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