1/* $NetBSD: t_mkfifo.c,v 1.3 2019/06/20 03:31:54 kamil Exp $ */
2
3/*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31#include <sys/cdefs.h>
32__RCSID("$NetBSD: t_mkfifo.c,v 1.3 2019/06/20 03:31:54 kamil Exp $");
33
34#include <sys/stat.h>
35#include <sys/wait.h>
36
37#include <atf-c.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <limits.h>
41#include <stdlib.h>
42#include <signal.h>
43#include <string.h>
44#include <unistd.h>
45
46static const char	path[] = "fifo";
47static void		support(void);
48
49static void
50support(void)
51{
52
53	errno = 0;
54
55	if (mkfifo(path, 0600) == 0) {
56		ATF_REQUIRE(unlink(path) == 0);
57		return;
58	}
59
60	if (errno == EOPNOTSUPP)
61		atf_tc_skip("the kernel does not support FIFOs");
62	else {
63		atf_tc_fail("mkfifo(2) failed");
64	}
65}
66
67ATF_TC_WITH_CLEANUP(mkfifo_block);
68ATF_TC_HEAD(mkfifo_block, tc)
69{
70	atf_tc_set_md_var(tc, "descr", "Test that FIFOs block");
71}
72
73ATF_TC_BODY(mkfifo_block, tc)
74{
75	int sta, fd = -1;
76	pid_t pid;
77
78	support();
79
80	ATF_REQUIRE(mkfifo(path, 0600) == 0);
81
82	pid = fork();
83	ATF_REQUIRE(pid >= 0);
84
85	if (pid == 0) {
86
87		/*
88		 * If we open the FIFO as read-only (write-only),
89		 * the call should block until another process
90		 * opens the FIFO for writing (reading).
91		 */
92		fd = open(path, O_RDONLY);
93
94		_exit(EXIT_FAILURE); /* NOTREACHED */
95	}
96
97	(void)sleep(1);
98
99	ATF_REQUIRE(kill(pid, SIGKILL) == 0);
100
101	(void)wait(&sta);
102
103	if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL)
104		atf_tc_fail("FIFO did not block");
105
106	(void)close(fd);
107	(void)unlink(path);
108}
109
110ATF_TC_CLEANUP(mkfifo_block, tc)
111{
112	(void)unlink(path);
113}
114
115ATF_TC_WITH_CLEANUP(mkfifo_err);
116ATF_TC_HEAD(mkfifo_err, tc)
117{
118	atf_tc_set_md_var(tc, "descr", "Test erros from mkfifo(2)");
119}
120
121ATF_TC_BODY(mkfifo_err, tc)
122{
123	char buf[PATH_MAX + 1];
124
125	support();
126
127	(void)memset(buf, 'x', sizeof(buf));
128	ATF_REQUIRE(mkfifo(path, 0600) == 0);
129
130	errno = 0;
131	ATF_REQUIRE_ERRNO(EFAULT, mkfifo((char *)-1, 0600) == -1);
132
133	errno = 0;
134	ATF_REQUIRE_ERRNO(EEXIST, mkfifo("/etc/passwd", 0600) == -1);
135
136	errno = 0;
137	ATF_REQUIRE_ERRNO(EEXIST, mkfifo(path, 0600) == -1);
138
139	errno = 0;
140	ATF_REQUIRE_ERRNO(ENAMETOOLONG, mkfifo(buf, 0600) == -1);
141
142	errno = 0;
143	ATF_REQUIRE_ERRNO(ENOENT, mkfifo("/a/b/c/d/e/f/g", 0600) == -1);
144
145	ATF_REQUIRE(unlink(path) == 0);
146}
147
148ATF_TC_CLEANUP(mkfifo_err, tc)
149{
150	(void)unlink(path);
151}
152
153ATF_TC_WITH_CLEANUP(mkfifo_nonblock);
154ATF_TC_HEAD(mkfifo_nonblock, tc)
155{
156	atf_tc_set_md_var(tc, "descr", "Test O_NONBLOCK with FIFOs");
157}
158
159ATF_TC_BODY(mkfifo_nonblock, tc)
160{
161	int fd, sta;
162	pid_t pid;
163
164	support();
165
166	fd = -1;
167	ATF_REQUIRE(mkfifo(path, 0600) == 0);
168
169	pid = fork();
170	ATF_REQUIRE(pid >= 0);
171
172	if (pid == 0) {
173
174		/*
175		 * If we open the FIFO as O_NONBLOCK, the O_RDONLY
176		 * call should return immediately, whereas the call
177		 * for write-only should fail with ENXIO.
178		 */
179		fd = open(path, O_RDONLY | O_NONBLOCK);
180
181		if (fd >= 0)
182			_exit(EXIT_SUCCESS);
183
184		(void)pause();	/* NOTREACHED */
185	}
186
187	(void)sleep(1);
188
189	errno = 0;
190	ATF_REQUIRE_ERRNO(ENXIO, open(path, O_WRONLY | O_NONBLOCK) == -1);
191
192	(void)kill(pid, SIGKILL);
193	(void)wait(&sta);
194
195	if (WIFSIGNALED(sta) != 0 || WTERMSIG(sta) == SIGKILL)
196		atf_tc_fail("FIFO blocked for O_NONBLOCK open(2)");
197
198	(void)close(fd);
199	(void)unlink(path);
200}
201
202ATF_TC_CLEANUP(mkfifo_nonblock, tc)
203{
204	(void)unlink(path);
205}
206
207ATF_TC_WITH_CLEANUP(mkfifo_perm);
208ATF_TC_HEAD(mkfifo_perm, tc)
209{
210	atf_tc_set_md_var(tc, "descr", "Test permissions with mkfifo(2)");
211	atf_tc_set_md_var(tc, "require.user", "unprivileged");
212}
213
214ATF_TC_BODY(mkfifo_perm, tc)
215{
216
217	support();
218
219	errno = 0;
220	ATF_REQUIRE_ERRNO(EACCES, mkfifo("/root/fifo", 0600) == -1);
221
222	ATF_REQUIRE(mkfifo(path, 0600) == 0);
223
224	/*
225	 * For some reason this fails with EFTYPE...
226	 */
227	errno = 0;
228	ATF_REQUIRE_ERRNO(EFTYPE, chmod(path, 1777) == -1);
229
230	ATF_REQUIRE(unlink(path) == 0);
231}
232
233ATF_TC_CLEANUP(mkfifo_perm, tc)
234{
235	(void)unlink(path);
236}
237
238ATF_TC_WITH_CLEANUP(mkfifo_stat);
239ATF_TC_HEAD(mkfifo_stat, tc)
240{
241	atf_tc_set_md_var(tc, "descr", "Test mkfifo(2) with stat");
242}
243
244ATF_TC_BODY(mkfifo_stat, tc)
245{
246	struct stat st;
247
248	support();
249
250	(void)memset(&st, 0, sizeof(struct stat));
251
252	ATF_REQUIRE(mkfifo(path, 0600) == 0);
253	ATF_REQUIRE(stat(path, &st) == 0);
254
255	if (S_ISFIFO(st.st_mode) == 0)
256		atf_tc_fail("invalid mode from mkfifo(2)");
257
258	ATF_REQUIRE(unlink(path) == 0);
259}
260
261ATF_TC_CLEANUP(mkfifo_stat, tc)
262{
263	(void)unlink(path);
264}
265
266ATF_TC_WITH_CLEANUP(mknod_s_ififo);
267ATF_TC_HEAD(mknod_s_ififo, tc)
268{
269	atf_tc_set_md_var(tc, "descr", "Test mknod(2) with S_IFIFO");
270}
271
272ATF_TC_BODY(mknod_s_ififo, tc)
273{
274	struct stat st;
275
276	support();
277
278	(void)memset(&st, 0, sizeof(struct stat));
279
280	ATF_REQUIRE(mknod(path, S_IFIFO | 0600, 0) == 0);
281	ATF_REQUIRE(stat(path, &st) == 0);
282
283	if (S_ISFIFO(st.st_mode) == 0)
284		atf_tc_fail("invalid mode from mknod(2) with S_IFIFO");
285
286	ATF_REQUIRE(unlink(path) == 0);
287}
288
289ATF_TC_CLEANUP(mknod_s_ififo, tc)
290{
291	(void)unlink(path);
292}
293
294ATF_TP_ADD_TCS(tp)
295{
296
297	ATF_TP_ADD_TC(tp, mkfifo_block);
298	ATF_TP_ADD_TC(tp, mkfifo_err);
299	ATF_TP_ADD_TC(tp, mkfifo_nonblock);
300	ATF_TP_ADD_TC(tp, mkfifo_perm);
301	ATF_TP_ADD_TC(tp, mkfifo_stat);
302	ATF_TP_ADD_TC(tp, mknod_s_ififo);
303
304	return atf_no_error();
305}
306