[PATCH liburing v2 3/5] tests: Add test for bind/listen commands

[Gabriel Krisman Bertazi <krisman@suse.de>]

This test implements verification for bind/listen commands. First, it
creates a TCP connection with itself only using io_uring and verify it
works by sending data over it.  Then, some unit test verifies some
failed cases of malformed bind and listen operations.

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
 test/Makefile      |   1 +
 test/bind-listen.c | 381 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 382 insertions(+)
 create mode 100644 test/bind-listen.c

diff --git a/test/Makefile b/test/Makefile
index fcf6554..a47ca6f 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -52,6 +52,7 @@ test_srcs := \
 	across-fork.c \
 	b19062a56726.c \
 	b5837bd5311d.c \
+	bind-listen.c \
 	buf-ring.c \
 	buf-ring-nommap.c \
 	buf-ring-put.c \
diff --git a/test/bind-listen.c b/test/bind-listen.c
new file mode 100644
index 0000000..1fa3b54
--- /dev/null
+++ b/test/bind-listen.c
@@ -0,0 +1,381 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Configure and operate a TCP socket solely with io_uring.
+ */
+#include <stdio.h>
+#include <string.h>
+#include <liburing.h>
+#include <err.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <netinet/ip.h>
+#include "liburing.h"
+#include "helpers.h"
+
+static void msec_to_ts(struct __kernel_timespec *ts, unsigned int msec)
+{
+        ts->tv_sec = msec / 1000;
+        ts->tv_nsec = (msec % 1000) * 1000000;
+}
+
+const char *magic = "Hello World!";
+
+enum {
+	SRV_INDEX = 0,
+	CLI_INDEX,
+	CONN_INDEX,
+};
+
+static int connect_client(struct io_uring *ring, unsigned short peer_port)
+{
+
+	struct __kernel_timespec ts;
+	struct io_uring_sqe *sqe;
+	struct io_uring_cqe *cqe;
+	int head, ret, submitted = 0;
+	struct sockaddr_in peer_addr;
+ 	socklen_t addr_len = sizeof(peer_addr);
+
+	peer_addr.sin_family = AF_INET;
+	peer_addr.sin_port = peer_port;
+	peer_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_socket_direct(sqe, AF_INET, SOCK_STREAM, 0,
+				    CLI_INDEX, 0);
+	sqe->flags |= IOSQE_IO_LINK;
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_connect(sqe, CLI_INDEX, (struct sockaddr*) &peer_addr, addr_len);
+	sqe->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_send(sqe, CLI_INDEX, magic, strlen(magic), 0);
+	sqe->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
+
+	submitted = ret = io_uring_submit(ring);
+	if (ret < 0)
+		return T_SETUP_SKIP;
+
+	msec_to_ts(&ts, 300);
+	ret = io_uring_wait_cqes(ring, &cqe, submitted, &ts, NULL);
+	if (ret < 0)
+		return T_SETUP_SKIP;
+
+	io_uring_for_each_cqe(ring, head, cqe) {
+		ret = cqe->res;
+		if (ret < 0)
+			return T_SETUP_SKIP;
+	} io_uring_cq_advance(ring, submitted);
+
+	return T_SETUP_OK;
+}
+
+static int setup_srv(struct io_uring *ring, struct sockaddr_in *server_addr)
+{
+	int val;
+	int submitted;
+	struct io_uring_sqe *sqe;
+	struct io_uring_cqe *cqe;
+	struct __kernel_timespec ts;
+	int head;
+
+	int ret;
+
+	memset(server_addr, 0, sizeof(struct sockaddr_in));
+	server_addr->sin_family = AF_INET;
+	server_addr->sin_port = htons(8000);
+	server_addr->sin_addr.s_addr = htons(INADDR_ANY);
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_socket_direct(sqe, AF_INET, SOCK_STREAM, 0, SRV_INDEX, 0);
+	sqe->flags |= IOSQE_IO_LINK;
+
+	sqe = io_uring_get_sqe(ring);
+	val = 1;
+	io_uring_prep_cmd_sock(sqe, SOCKET_URING_OP_SETSOCKOPT, 0, SOL_SOCKET,
+			       SO_REUSEADDR, &val, sizeof(val));
+	sqe->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_bind(sqe, SRV_INDEX, (struct sockaddr *) server_addr,
+			   sizeof(struct sockaddr_in));
+	sqe->flags |= IOSQE_FIXED_FILE | IOSQE_IO_LINK;
+
+	sqe = io_uring_get_sqe(ring);
+	io_uring_prep_listen(sqe, SRV_INDEX, 1);
+	sqe->flags |= IOSQE_FIXED_FILE;
+
+	submitted = ret = io_uring_submit(ring);
+	if (ret < 0) {
+		fprintf(stderr, "submission failed. %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	msec_to_ts(&ts, 300);
+	ret = io_uring_wait_cqes(ring, &cqe, ret, &ts, NULL);
+	if (ret < 0) {
+		fprintf(stderr, "submission failed. %d\n", ret);
+		return T_EXIT_FAIL;
+	}
+
+	io_uring_for_each_cqe(ring, head, cqe) {
+		ret = cqe->res;
+		if (ret < 0) {
+			fprintf(stderr, "Server startup failed. step %d got %d \n", head, ret);
+			return T_EXIT_FAIL;
+		}
+	} io_uring_cq_advance(ring, submitted);
+
+	return T_SETUP_OK;
+}
+
+static int test_good_server()
+{
+	struct sockaddr_in server_addr;
+	struct __kernel_timespec ts;
+	struct io_uring_sqe *sqe;
+	struct io_uring_cqe *cqe;
+	struct io_uring ring;
+	int ret;
+	int fds[3];
+	char buf[1024];
+
+	memset(fds, -1, sizeof(fds));
+
+	ret = t_create_ring(10, &ring, IORING_SETUP_SUBMIT_ALL);
+	if (ret < 0) {
+		fprintf(stderr, "queue_init: %s\n", strerror(-ret));
+		return T_SETUP_SKIP;
+	}
+
+	ret = io_uring_register_files(&ring, fds, 3);
+	if (ret) {
+		fprintf(stderr, "server file register %d\n", ret);
+		return T_SETUP_SKIP;
+	}
+
+	ret = setup_srv(&ring, &server_addr);
+	if (ret != T_SETUP_OK) {
+		fprintf(stderr, "srv startup failed.\n");
+		return T_EXIT_FAIL;
+	}
+
+	if (connect_client(&ring, server_addr.sin_port) != T_SETUP_OK) {
+		fprintf(stderr, "cli startup failed.\n");
+		return T_SETUP_SKIP;
+	}
+
+	/* Wait for a request */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_accept_direct(sqe, SRV_INDEX, NULL, NULL, 0, CONN_INDEX);
+	sqe->flags |= IOSQE_FIXED_FILE;
+
+	io_uring_submit(&ring);
+	io_uring_wait_cqe(&ring, &cqe);
+	if (cqe->res < 0) {
+		fprintf(stderr, "accept failed. %d\n", cqe->res);
+		return T_EXIT_FAIL;
+	}
+	io_uring_cqe_seen(&ring, cqe);
+
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_recv(sqe, CONN_INDEX, buf, BUFSIZ, 0);
+	sqe->flags |= IOSQE_FIXED_FILE;
+
+	io_uring_submit(&ring);
+	io_uring_wait_cqe_timeout(&ring, &cqe, &ts);
+
+	if (cqe->res < 0) {
+		fprintf(stderr, "bad receive cqe. %d\n", cqe->res);
+		return T_EXIT_FAIL;
+	}
+	ret = cqe->res;
+
+	io_uring_queue_exit(&ring);
+
+	if (ret != strlen(magic) || strncmp(buf, magic, ret)) {
+		fprintf(stderr, "didn't receive expected string. Got %d '%s'\n", ret, buf);
+		return T_EXIT_FAIL;
+	}
+	fprintf(stderr, "expected string. Got %d '%s'\n", ret, buf);
+	return T_EXIT_PASS;
+}
+
+int test_bad_bind()
+{
+	int sock;
+	struct sockaddr_in server_addr;
+	struct io_uring_sqe *sqe;
+	struct io_uring_cqe *cqe;
+	struct io_uring ring;
+	int err;
+	int ret = T_EXIT_FAIL;
+
+	memset(&server_addr, 0, sizeof(struct sockaddr_in));
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_port = htons(8001);
+	server_addr.sin_addr.s_addr = htons(INADDR_ANY);
+
+	err = t_create_ring(1, &ring, 0);
+	if (err < 0) {
+		fprintf(stderr, "queue_init: %s\n", strerror(-ret));
+		return T_SETUP_SKIP;
+	}
+
+	sock = socket(AF_INET, SOCK_STREAM, 0);
+
+	/* Bind with size 0 */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_bind(sqe, sock, (struct sockaddr *) &server_addr, 0);
+	err = io_uring_submit(&ring);
+	if (err < 0)
+		goto fail;
+
+	err = io_uring_wait_cqe(&ring, &cqe);
+	if (err)
+		goto fail;
+
+	if (cqe->res != -EINVAL)
+		goto fail;
+	io_uring_cqe_seen(&ring, cqe);
+
+	/* Bind with bad fd */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_bind(sqe, 0, (struct sockaddr *) &server_addr,  sizeof(struct sockaddr_in));
+	err = io_uring_submit(&ring);
+	if (err < 0)
+		goto fail;
+
+	err = io_uring_wait_cqe(&ring, &cqe);
+	if (err)
+		goto fail;
+	if (cqe->res != -ENOTSOCK)
+		goto fail;
+	io_uring_cqe_seen(&ring, cqe);
+
+	ret = T_EXIT_PASS;
+
+	/* bind with weird value */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_bind(sqe, sock, (struct sockaddr *) &server_addr,  sizeof(struct sockaddr_in));
+	sqe->rw_flags = 1;
+	err = io_uring_submit(&ring);
+	if (err < 0)
+		goto fail;
+
+	err = io_uring_wait_cqe(&ring, &cqe);
+	if (err)
+		goto fail;
+	if (cqe->res != -EINVAL)
+		goto fail;
+	io_uring_cqe_seen(&ring, cqe);
+
+	ret = T_EXIT_PASS;
+
+fail:
+	io_uring_queue_exit(&ring);
+	if (sock)
+		close(sock);
+	return ret;
+}
+
+int test_bad_listen()
+{
+	int sock;
+	struct sockaddr_in server_addr;
+	struct io_uring_sqe *sqe;
+	struct io_uring_cqe *cqe;
+	struct io_uring ring;
+	int err;
+	int ret = T_EXIT_FAIL;
+
+	memset(&server_addr, 0, sizeof(struct sockaddr_in));
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_port = htons(8001);
+	server_addr.sin_addr.s_addr = htons(INADDR_ANY);
+
+	err = t_create_ring(1, &ring, 0);
+	if (err < 0) {
+		fprintf(stderr, "queue_init: %d\n", err);
+		return T_SETUP_SKIP;
+	}
+
+	sock = socket(AF_INET, SOCK_STREAM, 0);
+	if (!sock) {
+		fprintf(stderr, "bad sock\n");
+		goto fail;
+	}
+	if (bind(sock, (struct sockaddr *) &server_addr,  sizeof(struct sockaddr_in))) {
+		fprintf(stderr, "bad bind\n");
+		goto fail;
+	}
+
+	/* listen on bad sock */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_listen(sqe, 0, 1);
+	err = io_uring_submit(&ring);
+	if (err < 0)
+		goto fail;
+
+	err = io_uring_wait_cqe(&ring, &cqe);
+	if (err)
+		goto fail;
+
+	if (cqe->res != -ENOTSOCK)
+		goto fail;
+	io_uring_cqe_seen(&ring, cqe);
+
+	/* listen with weird parameters */
+	sqe = io_uring_get_sqe(&ring);
+	io_uring_prep_listen(sqe, sock, 1);
+	sqe->addr2 = 0xffffff;
+	err = io_uring_submit(&ring);
+	if (err < 0)
+		goto fail;
+
+	err = io_uring_wait_cqe(&ring, &cqe);
+	if (err)
+		goto fail;
+
+	if (cqe->res != -EINVAL)
+		goto fail;
+	io_uring_cqe_seen(&ring, cqe);
+
+	ret = T_EXIT_PASS;
+fail:
+	io_uring_queue_exit(&ring);
+	if (sock)
+		close(sock);
+	return ret;
+}
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_probe *probe;
+	int failures = 0;
+	if (argc > 1)
+		return 0;
+
+	/*
+	 * This test is not supported in older kernels. Check for
+	 * OP_LISTEN, since that is the last feature required to support
+	 * it.
+	 */
+	probe = io_uring_get_probe();
+	if (!probe)
+		return 1;
+	if (!io_uring_opcode_supported(probe, IORING_OP_LISTEN))
+		return T_EXIT_SKIP;
+
+	failures += test_good_server();
+	failures += test_bad_bind();
+	failures += test_bad_listen();
+
+	if (!failures)
+		return T_EXIT_PASS;
+	return T_EXIT_FAIL;
+}
-- 
2.45.2