t_dup.c revision 1.3 
1/* $NetBSD: t_dup.c,v 1.3 2011/07/15 09:40:16 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 1.3 2011/07/15 09:40:16 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
48static char	path[] = "dup";
49static void	check_mode(bool, bool, bool);
50
51static void
52check_mode(bool _dup, bool _dup2, bool _dup3)
53{
54	int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR   };
55	int perm[5] = { 0700, 0400, 0600, 0444, 0666 };
56	struct stat st, st1;
57	int fd, fd1, fd2;
58	size_t i, j;
59
60	/*
61	 * Check that a duplicated descriptor
62	 * retains the mode of the original file.
63	 */
64	for (i = 0; i < __arraycount(mode); i++) {
65
66		for (j = 0; j < __arraycount(perm); j++) {
67
68			fd1 = open(path, mode[i] | O_CREAT, perm[j]);
69			fd2 = open("/etc/passwd", O_RDONLY);
70
71			ATF_REQUIRE(fd1 >= 0);
72			ATF_REQUIRE(fd2 >= 0);
73
74			if (_dup != false)
75				fd = dup(fd1);
76			else if (_dup2 != false)
77				fd = dup2(fd1, fd2);
78			else if (_dup3 != false)
79				fd = dup3(fd1, fd2, O_CLOEXEC);
80			else {
81				fd = -1;
82			}
83
84			ATF_REQUIRE(fd >= 0);
85
86			(void)memset(&st, 0, sizeof(struct stat));
87			(void)memset(&st1, 0, sizeof(struct stat));
88
89			ATF_REQUIRE(fstat(fd, &st) == 0);
90			ATF_REQUIRE(fstat(fd1, &st1) == 0);
91
92			if (st.st_mode != st1.st_mode)
93				atf_tc_fail("invalid mode");
94
95			(void)close(fd);
96			(void)close(fd1);
97			(void)close(fd2);
98			(void)unlink(path);
99		}
100	}
101}
102
103ATF_TC(dup2_basic);
104ATF_TC_HEAD(dup2_basic, tc)
105{
106	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
107}
108
109ATF_TC_BODY(dup2_basic, tc)
110{
111	int fd, fd1, fd2;
112
113	fd1 = open("/etc/passwd", O_RDONLY);
114	fd2 = open("/etc/passwd", O_RDONLY);
115
116	ATF_REQUIRE(fd1 >= 0);
117	ATF_REQUIRE(fd2 >= 0);
118
119	fd = dup2(fd1, fd2);
120	ATF_REQUIRE(fd >= 0);
121
122	if (fd != fd2)
123		atf_tc_fail("invalid descriptor");
124
125	(void)close(fd);
126	(void)close(fd1);
127
128	ATF_REQUIRE(close(fd2) != 0);
129}
130
131ATF_TC(dup2_err);
132ATF_TC_HEAD(dup2_err, tc)
133{
134	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)");
135}
136
137ATF_TC_BODY(dup2_err, tc)
138{
139	int fd;
140
141	fd = open("/etc/passwd", O_RDONLY);
142	ATF_REQUIRE(fd >= 0);
143
144	errno = 0;
145	ATF_REQUIRE_ERRNO(EBADF, dup2(-1, -1) == -1);
146
147	errno = 0;
148	ATF_REQUIRE_ERRNO(EBADF, dup2(fd, -1) == -1);
149
150	errno = 0;
151	ATF_REQUIRE_ERRNO(EBADF, dup2(-1, fd) == -1);
152
153	/*
154	 * Note that this should not fail with EINVAL.
155	 */
156	ATF_REQUIRE(dup2(fd, fd) != -1);
157
158	(void)close(fd);
159}
160
161ATF_TC_WITH_CLEANUP(dup2_mode);
162ATF_TC_HEAD(dup2_mode, tc)
163{
164	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
165}
166
167ATF_TC_BODY(dup2_mode, tc)
168{
169	check_mode(false, true, false);
170}
171
172ATF_TC_CLEANUP(dup2_mode, tc)
173{
174	(void)unlink(path);
175}
176
177
178ATF_TC(dup3_err);
179ATF_TC_HEAD(dup3_err, tc)
180{
181	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup3(2)");
182}
183
184ATF_TC_BODY(dup3_err, tc)
185{
186	int fd;
187
188	atf_tc_expect_fail("PR lib/45148");
189
190	fd = open("/etc/passwd", O_RDONLY);
191	ATF_REQUIRE(fd >= 0);
192
193	errno = 0;
194	ATF_REQUIRE(dup3(fd, fd, O_CLOEXEC) != -1);
195
196	errno = 0;
197	ATF_REQUIRE_ERRNO(EBADF, dup3(-1, -1, O_CLOEXEC) == -1);
198
199	errno = 0;
200	ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1);
201
202	errno = 0;
203	ATF_REQUIRE_ERRNO(EBADF, dup3(-1, fd, O_CLOEXEC) == -1);
204
205	errno = 0;
206	ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, 1, O_NOFOLLOW) == -1); /* Fails. */
207
208	(void)close(fd);
209}
210
211ATF_TC_WITH_CLEANUP(dup3_mode);
212ATF_TC_HEAD(dup3_mode, tc)
213{
214	atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)");
215}
216
217ATF_TC_BODY(dup3_mode, tc)
218{
219	check_mode(false, false, true);
220}
221
222ATF_TC_CLEANUP(dup3_mode, tc)
223{
224	(void)unlink(path);
225}
226
227ATF_TC(dup_err);
228ATF_TC_HEAD(dup_err, tc)
229{
230	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)");
231}
232
233ATF_TC_BODY(dup_err, tc)
234{
235
236	errno = 0;
237	ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1);
238}
239
240ATF_TC_WITH_CLEANUP(dup_max);
241ATF_TC_HEAD(dup_max, tc)
242{
243	atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits");
244}
245
246ATF_TC_BODY(dup_max, tc)
247{
248	struct rlimit res;
249	int *buf, fd, sta;
250	size_t i, n;
251	pid_t pid;
252
253	pid = fork();
254	ATF_REQUIRE(pid >= 0);
255
256	if (pid == 0) {
257
258		/*
259		 * Open a temporary file until the
260		 * maximum number of open files is
261		 * reached. Ater that dup(2) family
262		 * should fail with EMFILE.
263		 */
264		(void)closefrom(0);
265		(void)memset(&res, 0, sizeof(struct rlimit));
266
267		if (getrlimit(RLIMIT_NOFILE, &res) != 0)
268			_exit(EX_OSERR);
269
270		if (res.rlim_cur == 0 || res.rlim_max == 0)
271			_exit(EX_OSERR);
272
273		n = res.rlim_cur;
274		buf = calloc(n, sizeof(int));
275
276		if (buf == NULL)
277			_exit(EX_OSERR);
278
279		buf[0] = mkstemp(path);
280
281		if (buf[0] < 0)
282			_exit(EX_OSERR);
283
284		for (i = 1; i < n; i++) {
285
286			buf[i] = open(path, O_RDONLY);
287
288			if (buf[i] < 0)
289				_exit(EX_OSERR);
290		}
291
292		errno = 0;
293		fd = dup(buf[0]);
294
295		if (fd != -1 || errno != EMFILE)
296			_exit(EX_DATAERR);
297
298		_exit(EXIT_SUCCESS);
299	}
300
301	(void)wait(&sta);
302
303	if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) {
304
305		if (WEXITSTATUS(sta) == EX_OSERR)
306			atf_tc_fail("system call error");
307
308		if (WEXITSTATUS(sta) == EX_DATAERR)
309			atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE");
310
311		atf_tc_fail("unknown error");
312	}
313
314	(void)unlink(path);
315}
316
317ATF_TC_CLEANUP(dup_max, tc)
318{
319	(void)unlink(path);
320}
321
322ATF_TC_WITH_CLEANUP(dup_mode);
323ATF_TC_HEAD(dup_mode, tc)
324{
325	atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)");
326}
327
328ATF_TC_BODY(dup_mode, tc)
329{
330	check_mode(true, false, false);
331}
332
333ATF_TC_CLEANUP(dup_mode, tc)
334{
335	(void)unlink(path);
336}
337
338ATF_TP_ADD_TCS(tp)
339{
340
341	ATF_TP_ADD_TC(tp, dup2_basic);
342	ATF_TP_ADD_TC(tp, dup2_err);
343	ATF_TP_ADD_TC(tp, dup2_mode);
344	ATF_TP_ADD_TC(tp, dup3_err);
345	ATF_TP_ADD_TC(tp, dup3_mode);
346	ATF_TP_ADD_TC(tp, dup_err);
347	ATF_TP_ADD_TC(tp, dup_max);
348	ATF_TP_ADD_TC(tp, dup_mode);
349
350	return atf_no_error();
351}
352