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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 <stdio.h>
#include <stdint.h>
#include "knot/conf/schema.h"
#include "knot/include/module.h"
#include "contrib/string.h"
#include "contrib/time.h"
#include "libknot/libknot.h"
#ifdef HAVE_ATOMIC
#define ATOMIC_SET(dst, val) __atomic_store_n(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_GET(src) __atomic_load_n(&(src), __ATOMIC_RELAXED)
#else
#define ATOMIC_SET(dst, val) ((dst) = (val))
#define ATOMIC_GET(src) (src)
#endif
#define MOD_PATH "\x04""path"
#define MOD_CHANNELS "\x08""channels"
#define MOD_MAX_RATE "\x08""max-rate"
const yp_item_t probe_conf[] = {
{ MOD_PATH, YP_TSTR, YP_VNONE },
{ MOD_CHANNELS, YP_TINT, YP_VINT = { 1, UINT16_MAX, 1 } },
{ MOD_MAX_RATE, YP_TINT, YP_VINT = { 0, UINT32_MAX, 100000 } },
{ NULL }
};
typedef struct {
knot_probe_t **probes;
size_t probe_count;
uint64_t *last_times;
uint64_t min_diff_ns;
char *path;
} probe_ctx_t;
static void free_probe_ctx(probe_ctx_t *ctx)
{
for (int i = 0; ctx->probes != NULL && i < ctx->probe_count; ++i) {
knot_probe_free(ctx->probes[i]);
}
free(ctx->probes);
free(ctx->last_times);
free(ctx->path);
free(ctx);
}
static knotd_state_t export(knotd_state_t state, knot_pkt_t *pkt,
knotd_qdata_t *qdata, knotd_mod_t *mod)
{
assert(pkt && qdata);
probe_ctx_t *ctx = knotd_mod_ctx(mod);
uint16_t idx = qdata->params->thread_id % ctx->probe_count;
knot_probe_t *probe = ctx->probes[idx];
// Check the rate limit if enabled.
if (ctx->min_diff_ns > 0) {
struct timespec now = time_now();
uint64_t now_ns = 1000000000 * now.tv_sec + now.tv_nsec;
uint64_t last_ns = ATOMIC_GET(ctx->last_times[idx]);
if (now_ns - last_ns < ctx->min_diff_ns) {
return state;
}
ATOMIC_SET(ctx->last_times[idx], now_ns);
}
// Prepare data sources.
struct sockaddr_storage buff;
const struct sockaddr_storage *local = knotd_qdata_local_addr(qdata, &buff);
const struct sockaddr_storage *remote = knotd_qdata_remote_addr(qdata);
knot_probe_proto_t proto = (knot_probe_proto_t)qdata->params->proto;
const knot_pkt_t *reply = (state != KNOTD_STATE_NOOP ? pkt : NULL);
uint16_t rcode = qdata->rcode;
if (qdata->rcode_tsig != KNOT_RCODE_NOERROR) {
rcode = qdata->rcode_tsig;
}
// Fill out and export the data structure.
knot_probe_data_t d;
int ret = knot_probe_data_set(&d, proto, local, remote, qdata->query, reply, rcode);
if (ret == KNOT_EOK) {
d.tcp_rtt = knotd_qdata_rtt(qdata);
if (qdata->query->opt_rr != NULL) {
d.reply.ede = qdata->rcode_ede;
}
(void)knot_probe_produce(probe, &d, 1);
}
return state;
}
int probe_load(knotd_mod_t *mod)
{
probe_ctx_t *ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
return KNOT_ENOMEM;
}
knotd_conf_t conf = knotd_conf_mod(mod, MOD_CHANNELS);
ctx->probe_count = conf.single.integer;
conf = knotd_conf_mod(mod, MOD_PATH);
if (conf.count == 0) {
conf = knotd_conf(mod, C_SRV, C_RUNDIR, NULL);
}
if (conf.single.string[0] != '/') {
char *cwd = realpath("./", NULL);
ctx->path = sprintf_alloc("%s/%s", cwd, conf.single.string);
free(cwd);
} else {
ctx->path = strdup(conf.single.string);
}
if (ctx->path == NULL) {
free_probe_ctx(ctx);
return KNOT_ENOMEM;
}
ctx->probes = calloc(ctx->probe_count, sizeof(knot_probe_t *));
if (ctx->probes == NULL) {
free_probe_ctx(ctx);
return KNOT_ENOMEM;
}
ctx->last_times = calloc(ctx->probe_count, sizeof(uint64_t));
if (ctx->last_times == NULL) {
free_probe_ctx(ctx);
return KNOT_ENOMEM;
}
ctx->min_diff_ns = 0;
conf = knotd_conf_mod(mod, MOD_MAX_RATE);
if (conf.single.integer > 0) {
ctx->min_diff_ns = ctx->probe_count * 1000000000 / conf.single.integer;
}
for (int i = 0; i < ctx->probe_count; i++) {
knot_probe_t *probe = knot_probe_alloc();
if (probe == NULL) {
free_probe_ctx(ctx);
return KNOT_ENOMEM;
}
int ret = knot_probe_set_producer(probe, ctx->path, i + 1);
switch (ret) {
case KNOT_ECONN:
knotd_mod_log(mod, LOG_NOTICE, "channel %i not connected", i + 1);
case KNOT_EOK:
break;
default:
free_probe_ctx(ctx);
return ret;
}
ctx->probes[i] = probe;
}
knotd_mod_ctx_set(mod, ctx);
return knotd_mod_hook(mod, KNOTD_STAGE_END, export);
}
void probe_unload(knotd_mod_t *mod)
{
probe_ctx_t *ctx = knotd_mod_ctx(mod);
if (ctx != NULL) {
free_probe_ctx(ctx);
}
}
KNOTD_MOD_API(probe, KNOTD_MOD_FLAG_SCOPE_ANY | KNOTD_MOD_FLAG_OPT_CONF,
probe_load, probe_unload, probe_conf, NULL);
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