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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 <fcntl.h>
#include <poll.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#include "libknot/attribute.h"
#include "libknot/errcode.h"
#include "libknot/probe/probe.h"
#include "contrib/time.h"
struct knot_probe {
struct sockaddr_un path;
uint32_t last_unconn_time;
bool consumer;
int fd;
};
_public_
knot_probe_t *knot_probe_alloc(void)
{
knot_probe_t *probe = calloc(1, sizeof(*probe));
if (probe == NULL) {
return NULL;
}
probe->fd = -1;
return probe;
}
_public_
void knot_probe_free(knot_probe_t *probe)
{
if (probe == NULL) {
return;
}
close(probe->fd);
if (probe->consumer) {
(void)unlink(probe->path.sun_path);
}
free(probe);
}
static int probe_connect(knot_probe_t *probe)
{
return connect(probe->fd, (const struct sockaddr *)(&probe->path),
sizeof(probe->path));
}
static int probe_init(knot_probe_t *probe, const char *dir, uint16_t idx)
{
if (probe == NULL || dir == NULL || idx == 0) {
return KNOT_EINVAL;
}
probe->path.sun_family = AF_UNIX;
int ret = snprintf(probe->path.sun_path, sizeof(probe->path.sun_path),
"%s/probe%02u.sock", dir, idx);
if (ret < 0 || ret >= sizeof(probe->path.sun_path)) {
return KNOT_ERANGE;
}
probe->fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (probe->fd < 0) {
return knot_map_errno();
}
if (fcntl(probe->fd, F_SETFL, O_NONBLOCK) == -1) {
close(probe->fd);
probe->fd = -1;
return knot_map_errno();
}
return KNOT_EOK;
}
_public_
int knot_probe_set_producer(knot_probe_t *probe, const char *dir, uint16_t idx)
{
int ret = probe_init(probe, dir, idx);
if (ret != KNOT_EOK) {
return ret;
}
ret = probe_connect(probe);
if (ret != 0) {
return KNOT_ECONN;
}
return KNOT_EOK;
}
_public_
int knot_probe_set_consumer(knot_probe_t *probe, const char *dir, uint16_t idx)
{
int ret = probe_init(probe, dir, idx);
if (ret != KNOT_EOK) {
return ret;
}
probe->consumer = true;
(void)unlink(probe->path.sun_path);
ret = bind(probe->fd, (const struct sockaddr *)(&probe->path),
sizeof(probe->path));
if (ret != 0) {
return knot_map_errno();
}
if (chmod(probe->path.sun_path, S_IWUSR | S_IWGRP | S_IWOTH) != 0) {
close(probe->fd);
return knot_map_errno();
}
return KNOT_EOK;
}
_public_
int knot_probe_fd(knot_probe_t *probe)
{
if (probe == NULL) {
return -1;
}
return probe->fd;
}
_public_
int knot_probe_produce(knot_probe_t *probe, const knot_probe_data_t *data, uint8_t count)
{
if (probe == NULL || data == NULL || count != 1) {
return KNOT_EINVAL;
}
size_t used_len = sizeof(*data) - KNOT_DNAME_MAXLEN + data->query.qname_len;
if (send(probe->fd, data, used_len, 0) == -1) {
struct timespec now = time_now();
if (now.tv_sec - probe->last_unconn_time > 2) {
probe->last_unconn_time = now.tv_sec;
if ((errno == ENOTCONN || errno == ECONNREFUSED) &&
probe_connect(probe) == 0 &&
send(probe->fd, data, used_len, 0) > 0) {
return KNOT_EOK;
}
}
return knot_map_errno();
}
return KNOT_EOK;
}
_public_
int knot_probe_consume(knot_probe_t *probe, knot_probe_data_t *data, uint8_t count,
int timeout_ms)
{
if (probe == NULL || data == NULL || count == 0) {
return KNOT_EINVAL;
}
#ifdef ENABLE_RECVMMSG
struct mmsghdr msgs[count];
struct iovec iovecs[count];
memset(msgs, 0, sizeof(msgs));
for (int i = 0; i < count; i++) {
iovecs[i].iov_base = &(data[i]);
iovecs[i].iov_len = sizeof(*data);
msgs[i].msg_hdr.msg_iov = &iovecs[i];
msgs[i].msg_hdr.msg_iovlen = 1;
}
#else
struct iovec iov = {
.iov_base = data,
.iov_len = sizeof(*data)
};
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1
};
#endif
struct pollfd pfd = { .fd = probe->fd, .events = POLLIN };
int ret = poll(&pfd, 1, timeout_ms);
if (ret == -1) {
return knot_map_errno();
} else if ((pfd.revents & POLLIN) == 0) {
return 0;
}
#ifdef ENABLE_RECVMMSG
ret = recvmmsg(probe->fd, msgs, count, 0, NULL);
#else
ret = recvmsg(probe->fd, &msg, 0);
#endif
if (ret == -1) {
return knot_map_errno();
}
#ifdef ENABLE_RECVMMSG
return ret;
#else
return (ret > 0 ? 1 : 0);
#endif
}
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