t_dup.c revision 276478 
1/* $NetBSD: t_dup.c,v 1.8 2012/03/18 07:00:51 jruoho 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_dup.c,v 1.8 2012/03/18 07:00:51 jruoho Exp $");
33
34#include <sys/resource.h>
35#include <sys/stat.h>
36#include <sys/wait.h>
37
38#include <atf-c.h>
39#include <errno.h>
40#include <fcntl.h>
41#include <limits.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include <sysexits.h>
47
48#ifdef __FreeBSD__
49#include <stdbool.h>
50#endif
51
52static char	path[] = "dup";
53#ifdef __NetBSD__
54static void	check_mode(bool, bool, bool);
55#endif
56
57static void
58check_mode(bool _dup, bool _dup2, bool _dup3)
59{
60	int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR   };
61	int perm[5] = { 0700, 0400, 0600, 0444, 0666 };
62	struct stat st, st1;
63	int fd, fd1, fd2;
64	size_t i, j;
65
66	/*
67	 * Check that a duplicated descriptor
68	 * retains the mode of the original file.
69	 */
70	for (i = 0; i < __arraycount(mode); i++) {
71
72		for (j = 0; j < __arraycount(perm); j++) {
73
74			fd1 = open(path, mode[i] | O_CREAT, perm[j]);
75			fd2 = open("/etc/passwd", O_RDONLY);
76
77			ATF_REQUIRE(fd1 >= 0);
78			ATF_REQUIRE(fd2 >= 0);
79
80			if (_dup != false)
81				fd = dup(fd1);
82			else if (_dup2 != false)
83				fd = dup2(fd1, fd2);
84			else if (_dup3 != false)
85				fd = dup3(fd1, fd2, O_CLOEXEC);
86			else {
87				fd = -1;
88			}
89
90			ATF_REQUIRE(fd >= 0);
91
92			(void)memset(&st, 0, sizeof(struct stat));
93			(void)memset(&st1, 0, sizeof(struct stat));
94
95			ATF_REQUIRE(fstat(fd, &st) == 0);
96			ATF_REQUIRE(fstat(fd1, &st1) == 0);
97
98			if (st.st_mode != st1.st_mode)
99				atf_tc_fail("invalid mode");
100
101			(void)close(fd);
102			(void)close(fd1);
103			(void)close(fd2);
104			(void)unlink(path);
105		}
106	}
107}
108
109ATF_TC(dup2_basic);
110ATF_TC_HEAD(dup2_basic, tc)
111{
112	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
113}
114
115ATF_TC_BODY(dup2_basic, tc)
116{
117	int fd, fd1, fd2;
118
119	fd1 = open("/etc/passwd", O_RDONLY);
120	fd2 = open("/etc/passwd", O_RDONLY);
121
122	ATF_REQUIRE(fd1 >= 0);
123	ATF_REQUIRE(fd2 >= 0);
124
125	fd = dup2(fd1, fd2);
126	ATF_REQUIRE(fd >= 0);
127
128	if (fd != fd2)
129		atf_tc_fail("invalid descriptor");
130
131	(void)close(fd);
132	(void)close(fd1);
133
134	ATF_REQUIRE(close(fd2) != 0);
135}
136
137ATF_TC(dup2_err);
138ATF_TC_HEAD(dup2_err, tc)
139{
140	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)");
141}
142
143ATF_TC_BODY(dup2_err, tc)
144{
145	int fd;
146
147	fd = open("/etc/passwd", O_RDONLY);
148	ATF_REQUIRE(fd >= 0);
149
150	errno = 0;
151	ATF_REQUIRE_ERRNO(EBADF, dup2(-1, -1) == -1);
152
153	errno = 0;
154	ATF_REQUIRE_ERRNO(EBADF, dup2(fd, -1) == -1);
155
156	errno = 0;
157	ATF_REQUIRE_ERRNO(EBADF, dup2(-1, fd) == -1);
158
159	/*
160	 * Note that this should not fail with EINVAL.
161	 */
162	ATF_REQUIRE(dup2(fd, fd) != -1);
163
164	(void)close(fd);
165}
166
167ATF_TC(dup2_max);
168ATF_TC_HEAD(dup2_max, tc)
169{
170	atf_tc_set_md_var(tc, "descr", "Test dup2(2) against limits");
171}
172
173ATF_TC_BODY(dup2_max, tc)
174{
175	struct rlimit res;
176
177	(void)memset(&res, 0, sizeof(struct rlimit));
178	(void)getrlimit(RLIMIT_NOFILE, &res);
179
180	errno = 0;
181	ATF_REQUIRE_ERRNO(EBADF, dup2(STDERR_FILENO, res.rlim_cur + 1) == -1);
182}
183
184ATF_TC_WITH_CLEANUP(dup2_mode);
185ATF_TC_HEAD(dup2_mode, tc)
186{
187	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
188}
189
190ATF_TC_BODY(dup2_mode, tc)
191{
192	check_mode(false, true, false);
193}
194
195ATF_TC_CLEANUP(dup2_mode, tc)
196{
197	(void)unlink(path);
198}
199
200
201ATF_TC(dup3_err);
202ATF_TC_HEAD(dup3_err, tc)
203{
204	atf_tc_set_md_var(tc, "descr",
205	    "Test error conditions of dup3(2) (PR lib/45148)");
206}
207
208ATF_TC_BODY(dup3_err, tc)
209{
210	int fd;
211
212	fd = open("/etc/passwd", O_RDONLY);
213	ATF_REQUIRE(fd >= 0);
214
215	errno = 0;
216#if defined(__FreeBSD__) || defined(__linux__)
217	/*
218	 * FreeBSD and linux return EINVAL, because...
219	 *
220	 * [EINVAL] The oldd argument is equal to the newd argument.
221	 */
222	ATF_REQUIRE(dup3(fd, fd, O_CLOEXEC) == -1);
223#else
224	ATF_REQUIRE(dup3(fd, fd, O_CLOEXEC) != -1);
225#endif
226
227	errno = 0;
228#if defined(__FreeBSD__) || defined(__linux__)
229	ATF_REQUIRE_ERRNO(EINVAL, dup3(-1, -1, O_CLOEXEC) == -1);
230	ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1);
231#else
232	ATF_REQUIRE_ERRNO(EBADF, dup3(-1, -1, O_CLOEXEC) == -1);
233#endif
234
235	errno = 0;
236	ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1);
237
238	errno = 0;
239	ATF_REQUIRE_ERRNO(EBADF, dup3(-1, fd, O_CLOEXEC) == -1);
240
241	errno = 0;
242	ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, 1, O_NOFOLLOW) == -1);
243
244	(void)close(fd);
245}
246
247ATF_TC(dup3_max);
248ATF_TC_HEAD(dup3_max, tc)
249{
250	atf_tc_set_md_var(tc, "descr", "Test dup3(2) against limits");
251}
252
253ATF_TC_BODY(dup3_max, tc)
254{
255	struct rlimit res;
256
257	(void)memset(&res, 0, sizeof(struct rlimit));
258	(void)getrlimit(RLIMIT_NOFILE, &res);
259
260	errno = 0;
261	ATF_REQUIRE_ERRNO(EBADF, dup3(STDERR_FILENO,
262		res.rlim_cur + 1, O_CLOEXEC) == -1);
263}
264
265ATF_TC_WITH_CLEANUP(dup3_mode);
266ATF_TC_HEAD(dup3_mode, tc)
267{
268	atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)");
269}
270
271ATF_TC_BODY(dup3_mode, tc)
272{
273	check_mode(false, false, true);
274}
275
276ATF_TC_CLEANUP(dup3_mode, tc)
277{
278	(void)unlink(path);
279}
280
281ATF_TC(dup_err);
282ATF_TC_HEAD(dup_err, tc)
283{
284	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)");
285}
286
287ATF_TC_BODY(dup_err, tc)
288{
289
290	errno = 0;
291	ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1);
292}
293
294ATF_TC_WITH_CLEANUP(dup_max);
295ATF_TC_HEAD(dup_max, tc)
296{
297	atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits");
298}
299
300ATF_TC_BODY(dup_max, tc)
301{
302	struct rlimit res;
303	int *buf, fd, sta;
304	size_t i, n;
305	pid_t pid;
306
307	pid = fork();
308	ATF_REQUIRE(pid >= 0);
309
310	if (pid == 0) {
311
312		/*
313		 * Open a temporary file until the
314		 * maximum number of open files is
315		 * reached. Ater that dup(2) family
316		 * should fail with EMFILE.
317		 */
318		(void)closefrom(0);
319		(void)memset(&res, 0, sizeof(struct rlimit));
320
321		n = 10;
322		res.rlim_cur = res.rlim_max = n;
323		if (setrlimit(RLIMIT_NOFILE, &res) != 0)
324			_exit(EX_OSERR);
325
326		buf = calloc(n, sizeof(int));
327
328		if (buf == NULL)
329			_exit(EX_OSERR);
330
331		buf[0] = mkstemp(path);
332
333		if (buf[0] < 0)
334			_exit(EX_OSERR);
335
336		for (i = 1; i < n; i++) {
337
338			buf[i] = open(path, O_RDONLY);
339
340			if (buf[i] < 0)
341				_exit(EX_OSERR);
342		}
343
344		errno = 0;
345		fd = dup(buf[0]);
346
347		if (fd != -1 || errno != EMFILE)
348			_exit(EX_DATAERR);
349
350		_exit(EXIT_SUCCESS);
351	}
352
353	(void)wait(&sta);
354
355	if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) {
356
357		if (WEXITSTATUS(sta) == EX_OSERR)
358			atf_tc_fail("system call error");
359
360		if (WEXITSTATUS(sta) == EX_DATAERR)
361			atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE");
362
363		atf_tc_fail("unknown error");
364	}
365
366	(void)unlink(path);
367}
368
369ATF_TC_CLEANUP(dup_max, tc)
370{
371	(void)unlink(path);
372}
373
374ATF_TC_WITH_CLEANUP(dup_mode);
375ATF_TC_HEAD(dup_mode, tc)
376{
377	atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)");
378}
379
380ATF_TC_BODY(dup_mode, tc)
381{
382	check_mode(true, false, false);
383}
384
385ATF_TC_CLEANUP(dup_mode, tc)
386{
387	(void)unlink(path);
388}
389
390ATF_TP_ADD_TCS(tp)
391{
392
393	ATF_TP_ADD_TC(tp, dup2_basic);
394	ATF_TP_ADD_TC(tp, dup2_err);
395	ATF_TP_ADD_TC(tp, dup2_max);
396	ATF_TP_ADD_TC(tp, dup2_mode);
397	ATF_TP_ADD_TC(tp, dup3_err);
398	ATF_TP_ADD_TC(tp, dup3_max);
399	ATF_TP_ADD_TC(tp, dup3_mode);
400	ATF_TP_ADD_TC(tp, dup_err);
401	ATF_TP_ADD_TC(tp, dup_max);
402	ATF_TP_ADD_TC(tp, dup_mode);
403
404	return atf_no_error();
405}
406