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/* Copyright (C) 2022 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 "contrib/openbsd/siphash.h"
#include "knot/common/log.h"
#include "knot/conf/conf.h"
#include "knot/query/query.h"
#include "knot/query/requestor.h"
#include "knot/zone/zone.h"
#include "libknot/errcode.h"
static notifailed_rmt_hash notifailed_hash(conf_val_t *rmt_id)
{
SIPHASH_KEY zero_key = { 0, 0 };
SIPHASH_CTX ctx;
SipHash24_Init(&ctx, &zero_key);
SipHash24_Update(&ctx, rmt_id->data, rmt_id->len);
return SipHash24_End(&ctx);
}
/*!
* \brief NOTIFY message processing data.
*/
struct notify_data {
const knot_dname_t *zone;
const knot_rrset_t *soa;
const struct sockaddr *remote;
query_edns_data_t edns;
};
static int notify_begin(knot_layer_t *layer, void *params)
{
layer->data = params;
return KNOT_STATE_PRODUCE;
}
static int notify_produce(knot_layer_t *layer, knot_pkt_t *pkt)
{
struct notify_data *data = layer->data;
// mandatory: NOTIFY opcode, AA flag, SOA qtype
query_init_pkt(pkt);
knot_wire_set_opcode(pkt->wire, KNOT_OPCODE_NOTIFY);
knot_wire_set_aa(pkt->wire);
knot_pkt_put_question(pkt, data->zone, KNOT_CLASS_IN, KNOT_RRTYPE_SOA);
// unsecure hint: new SOA
if (data->soa) {
knot_pkt_begin(pkt, KNOT_ANSWER);
knot_pkt_put(pkt, KNOT_COMPR_HINT_QNAME, data->soa, 0);
}
query_put_edns(pkt, &data->edns);
return KNOT_STATE_CONSUME;
}
static int notify_consume(knot_layer_t *layer, knot_pkt_t *pkt)
{
return KNOT_STATE_DONE;
}
static const knot_layer_api_t NOTIFY_API = {
.begin = notify_begin,
.produce = notify_produce,
.consume = notify_consume,
};
#define NOTIFY_OUT_LOG(priority, zone, remote, reused, fmt, ...) \
ns_log(priority, zone, LOG_OPERATION_NOTIFY, LOG_DIRECTION_OUT, remote, \
(reused), fmt, ## __VA_ARGS__)
static int send_notify(conf_t *conf, zone_t *zone, const knot_rrset_t *soa,
const conf_remote_t *slave, int timeout, bool retry)
{
struct notify_data data = {
.zone = zone->name,
.soa = soa,
.remote = (struct sockaddr *)&slave->addr,
.edns = query_edns_data_init(conf, slave->addr.ss_family, 0)
};
knot_requestor_t requestor;
knot_requestor_init(&requestor, &NOTIFY_API, &data, NULL);
knot_pkt_t *pkt = knot_pkt_new(NULL, KNOT_WIRE_MAX_PKTSIZE, NULL);
if (!pkt) {
knot_requestor_clear(&requestor);
return KNOT_ENOMEM;
}
const struct sockaddr_storage *dst = &slave->addr;
const struct sockaddr_storage *src = &slave->via;
knot_request_flag_t flags = conf->cache.srv_tcp_fastopen ? KNOT_REQUEST_TFO : 0;
knot_request_t *req = knot_request_make(NULL, dst, src, pkt, &slave->key, flags);
if (!req) {
knot_request_free(req, NULL);
knot_requestor_clear(&requestor);
return KNOT_ENOMEM;
}
int ret = knot_requestor_exec(&requestor, req, timeout);
const char *log_retry = retry ? "retry, " : "";
if (ret == KNOT_EOK && knot_pkt_ext_rcode(req->resp) == 0) {
NOTIFY_OUT_LOG(LOG_INFO, zone->name, dst,
requestor.layer.flags & KNOT_REQUESTOR_REUSED,
"%sserial %u", log_retry, knot_soa_serial(soa->rrs.rdata));
zone->timers.last_notified_serial = (knot_soa_serial(soa->rrs.rdata) | LAST_NOTIFIED_SERIAL_VALID);
} else if (knot_pkt_ext_rcode(req->resp) == 0) {
NOTIFY_OUT_LOG(LOG_WARNING, zone->name, dst,
requestor.layer.flags & KNOT_REQUESTOR_REUSED,
"%sfailed (%s)", log_retry, knot_strerror(ret));
} else {
NOTIFY_OUT_LOG(LOG_WARNING, zone->name, dst,
requestor.layer.flags & KNOT_REQUESTOR_REUSED,
"%sserver responded with error '%s'",
log_retry, knot_pkt_ext_rcode_name(req->resp));
}
knot_request_free(req, NULL);
knot_requestor_clear(&requestor);
return ret;
}
int event_notify(conf_t *conf, zone_t *zone)
{
assert(zone);
bool failed = false;
if (zone_contents_is_empty(zone->contents)) {
return KNOT_EOK;
}
// NOTIFY content
int timeout = conf->cache.srv_tcp_remote_io_timeout;
knot_rrset_t soa = node_rrset(zone->contents->apex, KNOT_RRTYPE_SOA);
// in case of re-try, NOTIFY only failed remotes
pthread_mutex_lock(&zone->preferred_lock);
bool retry = (zone->notifailed.size > 0);
// send NOTIFY to each remote, use working address
conf_val_t notify = conf_zone_get(conf, C_NOTIFY, zone->name);
conf_mix_iter_t iter;
conf_mix_iter_init(conf, ¬ify, &iter);
while (iter.id->code == KNOT_EOK) {
notifailed_rmt_hash rmt_hash = notifailed_hash(iter.id);
if (retry && notifailed_rmt_dynarray_bsearch(&zone->notifailed, &rmt_hash) == NULL) {
conf_mix_iter_next(&iter);
continue;
}
pthread_mutex_unlock(&zone->preferred_lock);
conf_val_t addr = conf_id_get(conf, C_RMT, C_ADDR, iter.id);
size_t addr_count = conf_val_count(&addr);
int ret = KNOT_EOK;
for (int i = 0; i < addr_count; i++) {
conf_remote_t slave = conf_remote(conf, iter.id, i);
ret = send_notify(conf, zone, &soa, &slave, timeout, retry);
if (ret == KNOT_EOK) {
break;
}
}
pthread_mutex_lock(&zone->preferred_lock);
if (ret != KNOT_EOK) {
failed = true;
notifailed_rmt_dynarray_add(&zone->notifailed, &rmt_hash);
} else {
notifailed_rmt_dynarray_remove(&zone->notifailed, &rmt_hash);
}
conf_mix_iter_next(&iter);
}
if (failed) {
notifailed_rmt_dynarray_sort_dedup(&zone->notifailed);
uint32_t retry_in = knot_soa_retry(soa.rrs.rdata);
conf_val_t val = conf_zone_get(conf, C_RETRY_MIN_INTERVAL, zone->name);
retry_in = MAX(retry_in, conf_int(&val));
val = conf_zone_get(conf, C_RETRY_MAX_INTERVAL, zone->name);
retry_in = MIN(retry_in, conf_int(&val));
zone_events_schedule_at(zone, ZONE_EVENT_NOTIFY, time(NULL) + retry_in);
}
pthread_mutex_unlock(&zone->preferred_lock);
return failed ? KNOT_ERROR : KNOT_EOK;
}
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