1/*-
2 * Copyright (c) 2005 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/10.3/tools/regression/sockets/unix_bindconnect/unix_bindconnect.c 281974 2015-04-25 05:31:52Z ngie $
27 */
28
29#include <sys/types.h>
30#include <sys/socket.h>
31#include <sys/un.h>
32
33#include <err.h>
34#include <errno.h>
35#include <limits.h>
36#include <stdio.h>
37#include <string.h>
38#include <unistd.h>
39
40/*
41 * Simple regression test to exercise some error cases relating to the use of
42 * bind() and connect() on UNIX domain sockets.  In particular, make sure
43 * that when two sockets rendezvous using the file system name space, they
44 * get the expected success/failure cases.
45 *
46 * TODO:
47 * - Check that the resulting file mode/owner are right.
48 * - Do the same tests with UNIX domain sockets.
49 * - Check the results of getsockaddr() and getpeeraddr().
50 */
51
52#define	SOCK_NAME_ONE	"socket.1"
53#define	SOCK_NAME_TWO	"socket.2"
54
55#define	UNWIND_MAX	1024
56
57static int unwind_len;
58static struct unwind {
59	char	u_path[PATH_MAX];
60} unwind_list[UNWIND_MAX];
61
62static void
63push_path(const char *path)
64{
65
66	if (unwind_len >= UNWIND_MAX)
67		err(-1, "push_path: one path too many (%s)", path);
68
69	strlcpy(unwind_list[unwind_len].u_path, path, PATH_MAX);
70	unwind_len++;
71}
72
73static void
74unwind(void)
75{
76	int i;
77
78	for (i = unwind_len - 1; i >= 0; i--) {
79		unlink(unwind_list[i].u_path);
80		rmdir(unwind_list[i].u_path);
81	}
82}
83
84static int
85bind_test(const char *directory_path)
86{
87	char socket_path[PATH_MAX];
88	struct sockaddr_un sun;
89	int sock1, sock2;
90
91	sock1 = socket(PF_UNIX, SOCK_STREAM, 0);
92	if (sock1 < 0) {
93		warn("bind_test: socket(PF_UNIX, SOCK_STREAM, 0)");
94		return (-1);
95	}
96
97	if (snprintf(socket_path, sizeof(socket_path), "%s/%s",
98	    directory_path, SOCK_NAME_ONE) >= PATH_MAX) {
99		warn("bind_test: snprintf(socket_path)");
100		close(sock1);
101		return (-1);
102	}
103
104	bzero(&sun, sizeof(sun));
105	sun.sun_len = sizeof(sun);
106	sun.sun_family = AF_UNIX;
107	if (snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", socket_path)
108	    >= (int)sizeof(sun.sun_path)) {
109		warn("bind_test: snprintf(sun.sun_path)");
110		close(sock1);
111		return (-1);
112	}
113
114	if (bind(sock1, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
115		warn("bind_test: bind(sun) #1");
116		close(sock1);
117		return (-1);
118	}
119
120	push_path(socket_path);
121
122	/*
123	 * Once a STREAM UNIX domain socket has been bound, it can't be
124	 * rebound.  Expected error is EINVAL.
125	 */
126	if (bind(sock1, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
127		warnx("bind_test: bind(sun) #2 succeeded");
128		close(sock1);
129		return (-1);
130	}
131	if (errno != EINVAL) {
132		warn("bind_test: bind(sun) #2");
133		close(sock1);
134		return (-1);
135	}
136
137	sock2 = socket(PF_UNIX, SOCK_STREAM, 0);
138	if (sock2 < 0) {
139		warn("bind_test: socket(PF_UNIX, SOCK_STREAM, 0)");
140		close(sock1);
141		return (-1);
142	}
143
144	/*
145	 * Since a socket is already bound to the pathname, it can't be bound
146	 * to a second socket.  Expected error is EADDRINUSE.
147	 */
148	if (bind(sock2, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
149		warnx("bind_test: bind(sun) #3 succeeded");
150		close(sock1);
151		close(sock2);
152		return (-1);
153	}
154	if (errno != EADDRINUSE) {
155		warn("bind_test: bind(sun) #2");
156		close(sock1);
157		close(sock2);
158		return (-1);
159	}
160
161	close(sock1);
162
163	/*
164	 * The socket bound to the pathname has been closed, but the pathname
165	 * can't be reused without first being unlinked.  Expected error is
166	 * EADDRINUSE.
167	 */
168	if (bind(sock2, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
169		warnx("bind_test: bind(sun) #4 succeeded");
170		close(sock2);
171		return (-1);
172	}
173	if (errno != EADDRINUSE) {
174		warn("bind_test: bind(sun) #4");
175		close(sock2);
176		return (-1);
177	}
178
179	unlink(socket_path);
180
181	/*
182	 * The pathname is now free, so the socket should be able to bind to
183	 * it.
184	 */
185	if (bind(sock2, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
186		warn("bind_test: bind(sun) #5");
187		close(sock2);
188		return (-1);
189	}
190
191	close(sock2);
192	return (0);
193}
194
195static int
196connect_test(const char *directory_path)
197{
198	char socket_path[PATH_MAX];
199	struct sockaddr_un sun;
200	int sock1, sock2;
201
202	sock1 = socket(PF_UNIX, SOCK_STREAM, 0);
203	if (sock1 < 0) {
204		warn("connect_test: socket(PF_UNIX, SOCK_STREAM, 0)");
205		return (-1);
206	}
207
208	if (snprintf(socket_path, sizeof(socket_path), "%s/%s",
209	    directory_path, SOCK_NAME_TWO) >= PATH_MAX) {
210		warn("connect_test: snprintf(socket_path)");
211		close(sock1);
212		return (-1);
213	}
214
215	bzero(&sun, sizeof(sun));
216	sun.sun_len = sizeof(sun);
217	sun.sun_family = AF_UNIX;
218	if (snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", socket_path)
219	    >= (int)sizeof(sun.sun_path)) {
220		warn("connect_test: snprintf(sun.sun_path)");
221		close(sock1);
222		return (-1);
223	}
224
225	/*
226	 * Try connecting to a path that doesn't yet exist.  Should fail with
227	 * ENOENT.
228	 */
229	if (connect(sock1, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
230		warnx("connect_test: connect(sun) #1 succeeded");
231		close(sock1);
232		return (-1);
233	}
234	if (errno != ENOENT) {
235		warn("connect_test: connect(sun) #1");
236		close(sock1);
237		return (-1);
238	}
239
240	if (bind(sock1, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
241		warn("connect_test: bind(sun) #1");
242		close(sock1);
243		return (-1);
244	}
245
246	if (listen(sock1, 3) < 0) {
247		warn("connect_test: listen(sock1)");
248		close(sock1);
249		return (-1);
250	}
251
252	push_path(socket_path);
253
254	sock2 = socket(PF_UNIX, SOCK_STREAM, 0);
255	if (sock2 < 0) {
256		warn("socket(PF_UNIX, SOCK_STREAM, 0)");
257		close(sock1);
258		return (-1);
259	}
260
261	/*
262	 * Do a simple connect and make sure that works.
263	 */
264	if (connect(sock2, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
265		warn("connect(sun) #2");
266		close(sock1);
267		return (-1);
268	}
269
270	close(sock2);
271
272	close(sock1);
273
274	sock2 = socket(PF_UNIX, SOCK_STREAM, 0);
275	if (sock2 < 0) {
276		warn("socket(PF_UNIX, SOCK_STREAM, 0)");
277		return (-1);
278	}
279
280	/*
281	 * Confirm that once the listen socket is closed, we get a
282	 * connection refused (ECONNREFUSED) when attempting to connect to
283	 * the pathname.
284	 */
285	if (connect(sock2, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
286		warnx("connect(sun) #3 succeeded");
287		close(sock2);
288		return (-1);
289	}
290	if (errno != ECONNREFUSED) {
291		warn("connect(sun) #3");
292		close(sock2);
293		return (-1);
294	}
295
296	close(sock2);
297	unlink(socket_path);
298	return (0);
299}
300int
301main(void)
302{
303	char directory_path[PATH_MAX];
304	int error;
305
306	strlcpy(directory_path, "/tmp/unix_bind.XXXXXXX", PATH_MAX);
307	if (mkdtemp(directory_path) == NULL)
308		err(-1, "mkdtemp");
309	push_path(directory_path);
310
311	error = bind_test(directory_path);
312
313	if (error == 0)
314		error = connect_test(directory_path);
315
316	unwind();
317	return (error);
318}
319