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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 <tap/basic.h>
#include <fcntl.h>
#include <stdint.h>
#include <string.h>
#include <pthread.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include "libknot/errcode.h"
#include "contrib/net.h"
#include "contrib/sockaddr.h"
const int TIMEOUT = 2000;
static struct sockaddr_storage localhost(void)
{
struct sockaddr_storage addr = { 0 };
struct addrinfo *res = NULL;
if (getaddrinfo(NULL, "0", NULL, &res) == 0) {
memcpy(&addr, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
}
return addr;
}
struct data {
int server_fd;
uint8_t *buffer;
size_t size;
int result;
};
static void *thr_receive(void *data)
{
struct data *d = data;
struct pollfd pfd = { .fd = d->server_fd, .events = POLLIN };
int r = poll(&pfd, 1, TIMEOUT);
if (r != 1) {
d->result = KNOT_ETIMEOUT;
return NULL;
}
int client = accept(d->server_fd, NULL, NULL);
if (client < 0) {
d->result = KNOT_ECONN;
return NULL;
}
d->result = net_dns_tcp_recv(client, d->buffer, d->size, TIMEOUT);
close(client);
return NULL;
}
int main(int argc, char *argv[])
{
plan_lazy();
int r;
// create TCP server
struct sockaddr_storage addr = localhost();
int server = net_bound_socket(SOCK_STREAM, &addr, 0, 0);
ok(server >= 0, "server: bind socket");
r = listen(server, 1);
ok(r == 0, "server: start listening");
struct sockaddr *sa = (struct sockaddr *)&addr;
socklen_t salen = sockaddr_len(&addr);
r = getsockname(server, sa, &salen);
ok(r == 0, "server: get bound address");
// create TCP client
int client = net_connected_socket(SOCK_STREAM, &addr, NULL, false);
ok(client >= 0, "client: connect to server");
int optval = 8192;
socklen_t optlen = sizeof(optval);
r = setsockopt(client, SOL_SOCKET, SO_SNDBUF, &optval, optlen);
ok(r == 0, "client: configure small send buffer");
// accept TCP connection on the background
uint8_t recvbuf[UINT16_MAX] = { 0 };
struct data recv_data = {
.server_fd = server,
.buffer = recvbuf,
.size = sizeof(recvbuf)
};
pthread_t thr;
r = pthread_create(&thr, NULL, thr_receive, &recv_data);
ok(r == 0, "server: start receiver thread");
// send message (should handle partial-write correctly)
uint8_t sndbuf[UINT16_MAX];
for (size_t i = 0; i < sizeof(sndbuf); i++) {
sndbuf[i] = i;
}
r = net_dns_tcp_send(client, sndbuf, sizeof(sndbuf), TIMEOUT, NULL);
ok(r == sizeof(sndbuf), "client: net_dns_tcp_send() with short-write");
// receive message
r = pthread_join(thr, NULL);
ok(r == 0, "server: wait for receiver thread to terminate");
ok(recv_data.result == sizeof(recvbuf) &&
memcmp(sndbuf, recvbuf, sizeof(recvbuf)) == 0,
"server: net_dns_tcp_recv() complete and valid data");
// clean up
if (server >= 0) {
close(server);
}
if (client >= 0) {
close(client);
}
return 0;
}
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