Re: [PATCH v10 17/18] vsock_test: add SOCK_SEQPACKET tests

Stefano Garzarella <sgarzare@xxxxxxxxxx> · Thu, 3 Jun 2021 17:38:01 +0200

On Thu, May 20, 2021 at 10:19:50PM +0300, Arseny Krasnov wrote:
Implement two tests of SOCK_SEQPACKET socket: first sends data by
several 'write()'s and checks that number of 'read()' were same.
Second test checks MSG_TRUNC flag. Cases for connect(), bind(),
etc. are not tested, because it is same as for stream socket.

Signed-off-by: Arseny Krasnov <arseny.krasnov@xxxxxxxxxxxxx>
---
v9 -> v10:
1) Commit message updated.
2) Add second test for message bounds.

This patch LGTM, but I'll review better with the next version, running 
also the test suite on my VMs.

Thanks,
Stefano


tools/testing/vsock/util.c       |  32 +++++++--
tools/testing/vsock/util.h       |   3 +
tools/testing/vsock/vsock_test.c | 116 +++++++++++++++++++++++++++++++
3 files changed, 146 insertions(+), 5 deletions(-)

diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c
index 93cbd6f603f9..2acbb7703c6a 100644
--- a/tools/testing/vsock/util.c
+++ b/tools/testing/vsock/util.c
@@ -84,7 +84,7 @@ void vsock_wait_remote_close(int fd)
}

/* Connect to <cid, port> and return the file descriptor. */
-int vsock_stream_connect(unsigned int cid, unsigned int port)
+static int vsock_connect(unsigned int cid, unsigned int port, int type)
{
	union {
		struct sockaddr sa;
@@ -101,7 +101,7 @@ int vsock_stream_connect(unsigned int cid, unsigned int port)

	control_expectln("LISTENING");

-	fd = socket(AF_VSOCK, SOCK_STREAM, 0);
+	fd = socket(AF_VSOCK, type, 0);

	timeout_begin(TIMEOUT);
	do {
@@ -120,11 +120,21 @@ int vsock_stream_connect(unsigned int cid, unsigned int port)
	return fd;
}

+int vsock_stream_connect(unsigned int cid, unsigned int port)
+{
+	return vsock_connect(cid, port, SOCK_STREAM);
+}
+
+int vsock_seqpacket_connect(unsigned int cid, unsigned int port)
+{
+	return vsock_connect(cid, port, SOCK_SEQPACKET);
+}
+
/* Listen on <cid, port> and return the first incoming connection.  The remote
 * address is stored to clientaddrp.  clientaddrp may be NULL.
 */
-int vsock_stream_accept(unsigned int cid, unsigned int port,
-			struct sockaddr_vm *clientaddrp)
+static int vsock_accept(unsigned int cid, unsigned int port,
+			struct sockaddr_vm *clientaddrp, int type)
{
	union {
		struct sockaddr sa;
@@ -145,7 +155,7 @@ int vsock_stream_accept(unsigned int cid, unsigned int port,
	int client_fd;
	int old_errno;

-	fd = socket(AF_VSOCK, SOCK_STREAM, 0);
+	fd = socket(AF_VSOCK, type, 0);

	if (bind(fd, &addr.sa, sizeof(addr.svm)) < 0) {
		perror("bind");
@@ -189,6 +199,18 @@ int vsock_stream_accept(unsigned int cid, unsigned int port,
	return client_fd;
}

+int vsock_stream_accept(unsigned int cid, unsigned int port,
+			struct sockaddr_vm *clientaddrp)
+{
+	return vsock_accept(cid, port, clientaddrp, SOCK_STREAM);
+}
+
+int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
+			   struct sockaddr_vm *clientaddrp)
+{
+	return vsock_accept(cid, port, clientaddrp, SOCK_SEQPACKET);
+}
+
/* Transmit one byte and check the return value.
 *
 * expected_ret:
diff --git a/tools/testing/vsock/util.h b/tools/testing/vsock/util.h
index e53dd09d26d9..a3375ad2fb7f 100644
--- a/tools/testing/vsock/util.h
+++ b/tools/testing/vsock/util.h
@@ -36,8 +36,11 @@ struct test_case {
void init_signals(void);
unsigned int parse_cid(const char *str);
int vsock_stream_connect(unsigned int cid, unsigned int port);
+int vsock_seqpacket_connect(unsigned int cid, unsigned int port);
int vsock_stream_accept(unsigned int cid, unsigned int port,
			struct sockaddr_vm *clientaddrp);
+int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
+			   struct sockaddr_vm *clientaddrp);
void vsock_wait_remote_close(int fd);
void send_byte(int fd, int expected_ret, int flags);
void recv_byte(int fd, int expected_ret, int flags);
diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index 5a4fb80fa832..67766bfe176f 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -14,6 +14,8 @@
#include <errno.h>
#include <unistd.h>
#include <linux/kernel.h>
+#include <sys/types.h>
+#include <sys/socket.h>

#include "timeout.h"
#include "control.h"
@@ -279,6 +281,110 @@ static void test_stream_msg_peek_server(const struct test_opts *opts)
	close(fd);
}

+#define MESSAGES_CNT 7
+static void test_seqpacket_msg_bounds_client(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Send several messages, one with MSG_EOR flag */
+	for (int i = 0; i < MESSAGES_CNT; i++)
+		send_byte(fd, 1, 0);
+
+	control_writeln("SENDDONE");
+	close(fd);
+}
+
+static void test_seqpacket_msg_bounds_server(const struct test_opts *opts)
+{
+	int fd;
+	char buf[16];
+	struct msghdr msg = {0};
+	struct iovec iov = {0};
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("SENDDONE");
+	iov.iov_base = buf;
+	iov.iov_len = sizeof(buf);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	for (int i = 0; i < MESSAGES_CNT; i++) {
+		if (recvmsg(fd, &msg, 0) != 1) {
+			perror("message bound violated");
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	close(fd);
+}
+
+#define MESSAGE_TRUNC_SZ 32
+static void test_seqpacket_msg_trunc_client(const struct test_opts *opts)
+{
+	int fd;
+	char buf[MESSAGE_TRUNC_SZ];
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	if (send(fd, buf, sizeof(buf), 0) != sizeof(buf)) {
+		perror("send failed");
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("SENDDONE");
+	close(fd);
+}
+
+static void test_seqpacket_msg_trunc_server(const struct test_opts *opts)
+{
+	int fd;
+	char buf[MESSAGE_TRUNC_SZ / 2];
+	struct msghdr msg = {0};
+	struct iovec iov = {0};
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("SENDDONE");
+	iov.iov_base = buf;
+	iov.iov_len = sizeof(buf);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ssize_t ret = recvmsg(fd, &msg, MSG_TRUNC);
+
+	if (ret != MESSAGE_TRUNC_SZ) {
+		printf("%zi\n", ret);
+		perror("MSG_TRUNC doesn't work");
+		exit(EXIT_FAILURE);
+	}
+
+	if (!(msg.msg_flags & MSG_TRUNC)) {
+		fprintf(stderr, "MSG_TRUNC expected\n");
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
static struct test_case test_cases[] = {
	{
		.name = "SOCK_STREAM connection reset",
@@ -309,6 +415,16 @@ static struct test_case test_cases[] = {
		.run_client = test_stream_msg_peek_client,
		.run_server = test_stream_msg_peek_server,
	},
+	{
+		.name = "SOCK_SEQPACKET msg bounds",
+		.run_client = test_seqpacket_msg_bounds_client,
+		.run_server = test_seqpacket_msg_bounds_server,
+	},
+	{
+		.name = "SOCK_SEQPACKET MSG_TRUNC flag",
+		.run_client = test_seqpacket_msg_trunc_client,
+		.run_server = test_seqpacket_msg_trunc_server,
+	},
	{},
};

--
2.25.1


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