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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 <unistd.h>
#include "knot/dnssec/zone-events.h"
#include "knot/nameserver/internet.h"
#include "knot/nameserver/update.h"
#include "knot/query/requestor.h"
#include "libknot/libknot.h"
static int update_enqueue(zone_t *zone, knotd_qdata_t *qdata)
{
assert(zone);
assert(qdata);
/* Create serialized request. */
knot_request_t *req = calloc(1, sizeof(*req));
if (req == NULL) {
return KNOT_ENOMEM;
}
/* Store socket and remote address. */
req->fd = dup(qdata->params->socket);
memcpy(&req->remote, knotd_qdata_remote_addr(qdata), sizeof(req->remote));
/* Store update request. */
req->query = knot_pkt_new(NULL, qdata->query->max_size, NULL);
int ret = knot_pkt_copy(req->query, qdata->query);
if (ret != KNOT_EOK) {
knot_pkt_free(req->query);
free(req);
return ret;
}
/* Store and update possible TSIG context (see NS_NEED_AUTH). */
if (qdata->sign.tsig_key.name != NULL) {
req->sign = qdata->sign;
req->sign.tsig_digest = (uint8_t *)knot_tsig_rdata_mac(req->query->tsig_rr);
req->sign.tsig_key.name = req->query->tsig_rr->owner;
ret = dnssec_binary_dup(&qdata->sign.tsig_key.secret, &req->sign.tsig_key.secret);
if (ret != KNOT_EOK) {
knot_pkt_free(req->query);
free(req);
return ret;
}
assert(req->sign.tsig_digestlen == knot_tsig_rdata_mac_length(req->query->tsig_rr));
assert(req->sign.tsig_key.algorithm == knot_tsig_rdata_alg(req->query->tsig_rr));
}
pthread_mutex_lock(&zone->ddns_lock);
/* Enqueue created request. */
ptrlist_add(&zone->ddns_queue, req, NULL);
++zone->ddns_queue_size;
pthread_mutex_unlock(&zone->ddns_lock);
/* Schedule UPDATE event. */
zone_events_schedule_now(zone, ZONE_EVENT_UPDATE);
return KNOT_EOK;
}
int update_process_query(knot_pkt_t *pkt, knotd_qdata_t *qdata)
{
/* DDNS over XDP not supported. */
if (qdata->params->xdp_msg != NULL) {
qdata->rcode = KNOT_RCODE_SERVFAIL;
return KNOT_STATE_FAIL;
}
/* RFC1996 require SOA question. */
NS_NEED_QTYPE(qdata, KNOT_RRTYPE_SOA, KNOT_RCODE_FORMERR);
/* Check valid zone. */
NS_NEED_ZONE(qdata, KNOT_RCODE_NOTAUTH);
/* Need valid transaction security. */
NS_NEED_AUTH(qdata, ACL_ACTION_UPDATE);
/* Check expiration. */
NS_NEED_ZONE_CONTENTS(qdata);
/* Check frozen zone. */
NS_NEED_NOT_FROZEN(qdata);
/* Store update into DDNS queue. */
int ret = update_enqueue((zone_t *)qdata->extra->zone, qdata);
if (ret != KNOT_EOK) {
return KNOT_STATE_FAIL;
}
/* No immediate response. */
return KNOT_STATE_NOOP;
}
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