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/* SPDX-License-Identifier: MIT */
/*
* Check that IORING_OP_CONNECT properly returns -ECONNRESET when
* attempting to connect to an unreachable address. See:
*
* https://github.com/axboe/liburing/discussions/1335
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "liburing.h"
#include "helpers.h"
static int check_cqe(struct io_uring *ring, struct io_uring_cqe *cqe)
{
if (cqe->res == -EINVAL)
return T_EXIT_SKIP;
switch (cqe->user_data) {
case 1:
if (cqe->res != -ECONNRESET && cqe->res != -ENETUNREACH) {
fprintf(stderr, "Unexpected connect: %d\n", cqe->res);
return T_EXIT_FAIL;
}
break;
case 2:
if (cqe->res) {
fprintf(stderr, "Unexpected shutdown: %d\n", cqe->res);
return T_EXIT_FAIL;
}
break;
}
io_uring_cqe_seen(ring, cqe);
return T_EXIT_PASS;
}
static int test(struct io_uring *ring, struct sockaddr_in *saddr, int p_fd)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe1, *sqe2;
socklen_t val_len;
int ret, val;
sqe1 = io_uring_get_sqe(ring);
io_uring_prep_connect(sqe1, p_fd, (struct sockaddr *)saddr, sizeof(*saddr));
sqe1->user_data = 1;
ret = io_uring_submit(ring);
assert(ret != -1);
usleep(200000); // 200ms
sqe2 = io_uring_get_sqe(ring);
io_uring_prep_shutdown(sqe2, p_fd, SHUT_RDWR);
sqe2->user_data = 2;
ret = io_uring_submit(ring);
assert(ret != -1);
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait: %s\n", strerror(-ret));
return T_EXIT_FAIL;
}
ret = check_cqe(ring, cqe);
if (ret != T_EXIT_PASS)
return ret;
val = 0;
val_len = sizeof(val);
ret = getsockopt(p_fd, SOL_SOCKET, SO_ERROR, &val, &val_len);
assert(ret != -1);
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait: %s\n", strerror(-ret));
return T_EXIT_FAIL;
}
return check_cqe(ring, cqe);
}
int main(int argc, char *argv[])
{
struct sockaddr_in addr = { };
struct io_uring ring;
int val, p_fd, ret;
if (argc > 1)
return T_EXIT_SKIP;
p_fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP);
val = 1;
ret = setsockopt(p_fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
assert(ret != -1);
// NB. these are to make things faster
val = 2;
ret = setsockopt(p_fd, IPPROTO_TCP, TCP_SYNCNT, &val, sizeof(val));
assert(ret != -1);
val = 500; // 500ms
ret = setsockopt(p_fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &val, sizeof(val));
assert(ret != -1);
t_set_nonblock(p_fd);
addr.sin_family = AF_INET;
/* any unreachable address */
addr.sin_addr.s_addr = inet_addr("172.31.5.5");
addr.sin_port = htons(12345);
ret = io_uring_queue_init(2, &ring, 0);
assert(ret >= 0);
ret = test(&ring, &addr, p_fd);
io_uring_queue_exit(&ring);
return ret;
}
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