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 * $FreeBSD$
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
57 static int unwind_len;
58 static struct unwind {
59 char u_path[PATH_MAX];
60 } unwind_list[UNWIND_MAX];
61
62 static void
push_path(const char * path)63 push_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
73 static void
unwind(void)74 unwind(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
84 static int
bind_test(const char * directory_path)85 bind_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
195 static int
connect_test(const char * directory_path)196 connect_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 }
300 int
main(void)301 main(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