1/* $NetBSD: t_dup.c,v 1.10 2024/05/20 00:27:53 christos 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 1.10 2024/05/20 00:27:53 christos 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 <stdbool.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47#include <sysexits.h>
48
49static char	path[] = "dup";
50static void	check_mode(bool, bool, bool);
51
52static void
53check_mode(bool _dup, bool _dup2, bool _dup3)
54{
55	int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR   };
56	int perm[5] = { 0700, 0400, 0600, 0444, 0666 };
57	struct stat st, st1;
58	int fd, fd1, fd2;
59	size_t i, j;
60
61	/*
62	 * Check that a duplicated descriptor
63	 * retains the mode of the original file.
64	 */
65	for (i = 0; i < __arraycount(mode); i++) {
66
67		for (j = 0; j < __arraycount(perm); j++) {
68
69			fd1 = open(path, mode[i] | O_CREAT, perm[j]);
70			fd2 = open("/etc/passwd", O_RDONLY);
71
72			ATF_REQUIRE(fd1 >= 0);
73			ATF_REQUIRE(fd2 >= 0);
74
75			if (_dup != false)
76				fd = dup(fd1);
77			else if (_dup2 != false)
78				fd = dup2(fd1, fd2);
79			else if (_dup3 != false)
80				fd = dup3(fd1, fd2, O_CLOEXEC);
81			else {
82				fd = -1;
83			}
84
85			ATF_REQUIRE(fd >= 0);
86
87			(void)memset(&st, 0, sizeof(struct stat));
88			(void)memset(&st1, 0, sizeof(struct stat));
89
90			ATF_REQUIRE(fstat(fd, &st) == 0);
91			ATF_REQUIRE(fstat(fd1, &st1) == 0);
92
93			if (st.st_mode != st1.st_mode)
94				atf_tc_fail("invalid mode");
95
96			(void)close(fd);
97			(void)close(fd1);
98			(void)close(fd2);
99			(void)unlink(path);
100		}
101	}
102}
103
104ATF_TC(dup2_basic);
105ATF_TC_HEAD(dup2_basic, tc)
106{
107	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
108}
109
110ATF_TC_BODY(dup2_basic, tc)
111{
112	int fd, fd1, fd2;
113
114	fd1 = open("/etc/passwd", O_RDONLY);
115	fd2 = open("/etc/passwd", O_RDONLY);
116
117	ATF_REQUIRE(fd1 >= 0);
118	ATF_REQUIRE(fd2 >= 0);
119
120	fd = dup2(fd1, fd2);
121	ATF_REQUIRE(fd >= 0);
122
123	if (fd != fd2)
124		atf_tc_fail("invalid descriptor");
125
126	(void)close(fd);
127	(void)close(fd1);
128
129	ATF_REQUIRE(close(fd2) != 0);
130}
131
132ATF_TC(dup2_err);
133ATF_TC_HEAD(dup2_err, tc)
134{
135	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)");
136}
137
138ATF_TC_BODY(dup2_err, tc)
139{
140	int fd;
141
142	fd = open("/etc/passwd", O_RDONLY);
143	ATF_REQUIRE(fd >= 0);
144
145	errno = 0;
146	ATF_REQUIRE_ERRNO(EBADF, dup2(-1, -1) == -1);
147
148	errno = 0;
149	ATF_REQUIRE_ERRNO(EBADF, dup2(fd, -1) == -1);
150
151	errno = 0;
152	ATF_REQUIRE_ERRNO(EBADF, dup2(-1, fd) == -1);
153
154	/*
155	 * Note that this should not fail with EINVAL.
156	 */
157	ATF_REQUIRE(dup2(fd, fd) != -1);
158
159	(void)close(fd);
160}
161
162ATF_TC(dup2_max);
163ATF_TC_HEAD(dup2_max, tc)
164{
165	atf_tc_set_md_var(tc, "descr", "Test dup2(2) against limits");
166}
167
168ATF_TC_BODY(dup2_max, tc)
169{
170	struct rlimit res;
171
172	(void)memset(&res, 0, sizeof(struct rlimit));
173	(void)getrlimit(RLIMIT_NOFILE, &res);
174
175	errno = 0;
176	ATF_REQUIRE_ERRNO(EBADF, dup2(STDERR_FILENO, res.rlim_cur + 1) == -1);
177}
178
179ATF_TC_WITH_CLEANUP(dup2_mode);
180ATF_TC_HEAD(dup2_mode, tc)
181{
182	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
183}
184
185ATF_TC_BODY(dup2_mode, tc)
186{
187	check_mode(false, true, false);
188}
189
190ATF_TC_CLEANUP(dup2_mode, tc)
191{
192	(void)unlink(path);
193}
194
195
196ATF_TC(dup3_err);
197ATF_TC_HEAD(dup3_err, tc)
198{
199	atf_tc_set_md_var(tc, "descr",
200	    "Test error conditions of dup3(2) (PR lib/45148)");
201}
202
203ATF_TC_BODY(dup3_err, tc)
204{
205	int fd;
206
207	fd = open("/etc/passwd", O_RDONLY);
208	ATF_REQUIRE(fd >= 0);
209
210	errno = 0;
211	ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, fd, O_CLOEXEC) == -1);
212
213	errno = 0;
214	ATF_REQUIRE_ERRNO(EINVAL, dup3(-1, -1, O_CLOEXEC) == -1);
215
216	errno = 0;
217	ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1);
218
219	errno = 0;
220	ATF_REQUIRE_ERRNO(EBADF, dup3(-1, fd, O_CLOEXEC) == -1);
221
222	errno = 0;
223	ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, 1, O_NOFOLLOW) == -1);
224
225	(void)close(fd);
226}
227
228ATF_TC(dup3_max);
229ATF_TC_HEAD(dup3_max, tc)
230{
231	atf_tc_set_md_var(tc, "descr", "Test dup3(2) against limits");
232}
233
234ATF_TC_BODY(dup3_max, tc)
235{
236	struct rlimit res;
237
238	(void)memset(&res, 0, sizeof(struct rlimit));
239	(void)getrlimit(RLIMIT_NOFILE, &res);
240
241	errno = 0;
242	ATF_REQUIRE_ERRNO(EBADF, dup3(STDERR_FILENO,
243		res.rlim_cur + 1, O_CLOEXEC) == -1);
244}
245
246ATF_TC_WITH_CLEANUP(dup3_mode);
247ATF_TC_HEAD(dup3_mode, tc)
248{
249	atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)");
250}
251
252ATF_TC_BODY(dup3_mode, tc)
253{
254	check_mode(false, false, true);
255}
256
257ATF_TC_CLEANUP(dup3_mode, tc)
258{
259	(void)unlink(path);
260}
261
262ATF_TC(dup_err);
263ATF_TC_HEAD(dup_err, tc)
264{
265	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)");
266}
267
268ATF_TC_BODY(dup_err, tc)
269{
270
271	errno = 0;
272	ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1);
273}
274
275ATF_TC_WITH_CLEANUP(dup_max);
276ATF_TC_HEAD(dup_max, tc)
277{
278	atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits");
279}
280
281ATF_TC_BODY(dup_max, tc)
282{
283	struct rlimit res;
284	int *buf, fd, sta;
285	size_t i, n;
286	pid_t pid;
287
288	pid = fork();
289	ATF_REQUIRE(pid >= 0);
290
291	if (pid == 0) {
292
293		/*
294		 * Open a temporary file until the
295		 * maximum number of open files is
296		 * reached. Ater that dup(2) family
297		 * should fail with EMFILE.
298		 */
299		(void)closefrom(0);
300		(void)memset(&res, 0, sizeof(struct rlimit));
301
302		n = 10;
303		res.rlim_cur = res.rlim_max = n;
304		if (setrlimit(RLIMIT_NOFILE, &res) != 0)
305			_exit(EX_OSERR);
306
307		buf = calloc(n, sizeof(int));
308
309		if (buf == NULL)
310			_exit(EX_OSERR);
311
312		buf[0] = mkstemp(path);
313
314		if (buf[0] < 0)
315			_exit(EX_OSERR);
316
317		for (i = 1; i < n; i++) {
318
319			buf[i] = open(path, O_RDONLY);
320
321			if (buf[i] < 0)
322				_exit(EX_OSERR);
323		}
324
325		errno = 0;
326		fd = dup(buf[0]);
327
328		if (fd != -1 || errno != EMFILE)
329			_exit(EX_DATAERR);
330
331		_exit(EXIT_SUCCESS);
332	}
333
334	(void)wait(&sta);
335
336	if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) {
337
338		if (WEXITSTATUS(sta) == EX_OSERR)
339			atf_tc_fail("system call error");
340
341		if (WEXITSTATUS(sta) == EX_DATAERR)
342			atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE");
343
344		atf_tc_fail("unknown error");
345	}
346
347	(void)unlink(path);
348}
349
350ATF_TC_CLEANUP(dup_max, tc)
351{
352	(void)unlink(path);
353}
354
355ATF_TC_WITH_CLEANUP(dup_mode);
356ATF_TC_HEAD(dup_mode, tc)
357{
358	atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)");
359}
360
361ATF_TC_BODY(dup_mode, tc)
362{
363	check_mode(true, false, false);
364}
365
366ATF_TC_CLEANUP(dup_mode, tc)
367{
368	(void)unlink(path);
369}
370
371ATF_TP_ADD_TCS(tp)
372{
373
374	ATF_TP_ADD_TC(tp, dup2_basic);
375	ATF_TP_ADD_TC(tp, dup2_err);
376	ATF_TP_ADD_TC(tp, dup2_max);
377	ATF_TP_ADD_TC(tp, dup2_mode);
378	ATF_TP_ADD_TC(tp, dup3_err);
379	ATF_TP_ADD_TC(tp, dup3_max);
380	ATF_TP_ADD_TC(tp, dup3_mode);
381	ATF_TP_ADD_TC(tp, dup_err);
382	ATF_TP_ADD_TC(tp, dup_max);
383	ATF_TP_ADD_TC(tp, dup_mode);
384
385	return atf_no_error();
386}
387