wayland/tests/socket-test.c

/*
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/un.h>
#include <unistd.h>

#include "wayland-client.h"
#include "wayland-server.h"
#include "test-runner.h"

/* Paths longer than what the .sun_path array can contain must be rejected.
   This is a hard limitation of assigning a name to AF_UNIX/AF_LOCAL sockets.
   See `man 7 unix`. */

static const struct sockaddr_un example_sockaddr_un;

#define TOO_LONG (1 + sizeof example_sockaddr_un.sun_path)

/* Ensure the connection doesn't fail due to lack of XDG_RUNTIME_DIR. */
static const char *
require_xdg_runtime_dir(void)
{
	char *val = getenv("XDG_RUNTIME_DIR");
	if (!val)
		assert(0 && "set $XDG_RUNTIME_DIR to run this test");

	return val;
}

TEST(socket_path_overflow_client_connect)
{
	char path[TOO_LONG];
	struct wl_display *d;

	require_xdg_runtime_dir();

	memset(path, 'a', sizeof path);
	path[sizeof path - 1] = '\0';

	d = wl_display_connect(path);
	assert(d == NULL);
	assert(errno == ENAMETOOLONG);
}

TEST(socket_path_overflow_server_create)
{
	char path[TOO_LONG];
	struct wl_display *d;
	int ret;

	require_xdg_runtime_dir();

	memset(path, 'a', sizeof path);
	path[sizeof path - 1] = '\0';

	d = wl_display_create();
	assert(d != NULL);

	ret = wl_display_add_socket(d, path);
	assert(ret < 0);
	assert(errno == ENAMETOOLONG);

	wl_display_destroy(d);
}

TEST(add_existing_socket)
{
	char path[sizeof example_sockaddr_un.sun_path];
	const char *name = "wayland-test-0";
	const char *xdg_runtime_dir;
	struct wl_display *d;
	int ret;
	size_t len;

	xdg_runtime_dir = require_xdg_runtime_dir();

	d = wl_display_create();
	assert(d != NULL);

	/* this one should be OK */
	ret = wl_display_add_socket(d, name);
	assert(ret == 0);

	/* this on should fail */
	ret = wl_display_add_socket(d, name);
	assert(ret < 0);

	/* the original socket should still exists,
	 * this was a bug introduced in e2c0d47b0c77f18cd90e9c6eabb358c4d89681c8 */
	len = snprintf(path, sizeof example_sockaddr_un.sun_path, "%s/%s",
		       xdg_runtime_dir, name);
	assert(len < sizeof example_sockaddr_un.sun_path
	       && "Bug in test. Path too long");

	assert(access(path, F_OK) != -1);

	/* still should exists the original socket */
	ret = wl_display_add_socket(d, name);
	assert(ret < 0);

	wl_display_destroy(d);
}

TEST(add_socket_auto)
{
	/* the number of auto sockets is currently 32 */
	const int MAX_SOCKETS = 32;

	char path[sizeof example_sockaddr_un.sun_path];
	const char *name;
	const char *xdg_runtime_dir;
	struct wl_display *d;
	int i;
	size_t len;

	xdg_runtime_dir = require_xdg_runtime_dir();

	d = wl_display_create();
	assert(d != NULL);

	for (i = 0; i <= MAX_SOCKETS; ++i) {
		name = wl_display_add_socket_auto(d);
		assert(name != NULL);

		len = snprintf(path, sizeof example_sockaddr_un.sun_path,
			       "%s/%s", xdg_runtime_dir, name);
		assert(len < sizeof example_sockaddr_un.sun_path
		       && "Bug in test. Path too long");

		/* was the socket? */
		assert(access(path, F_OK) != -1);

		/* is the name sequential? */
		len = snprintf(path, sizeof example_sockaddr_un.sun_path,
			       "wayland-%d", i);
		assert(strcmp(name, path) == 0);
	}

	/* next addition should return NULL */
	name = wl_display_add_socket_auto(d);
	assert(name == NULL);

	/* check if the socket was not deleted the last time */
	name = wl_display_add_socket_auto(d);
	assert(name == NULL);

	wl_display_destroy(d);
}