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comparison tests/test-dirent-safer.c @ 11936:a126d5b22410

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dirent-safer: new module * modules/dirent-safer: New file. * lib/dirent--.h: Likewise. * lib/dirent-safer.h: Likewise. * lib/opendir-safer.c: Likewise. * m4/dirent-safer.m4: Likewise. * MODULES.html.sh (Enhancements for POSIX:2008): Mention it. * modules/dirent-safer-tests: New test. * tests/test-dirent-safer.c: New file. * lib/fdopendir.c (includes): Ensure fdopendir is also safe. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Tue, 01 Sep 2009 07:41:28 -0600
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children e45d9bb2233e
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11935:d233b3d8efbf 11936:a126d5b22410
1 /* Test that directory streams leave standard fds alone.
2 Copyright (C) 2009 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
16
17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */
18
19 #include <config.h>
20
21 #include "dirent--.h"
22
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <unistd.h>
28
29 #include "unistd-safer.h"
30
31 /* This test intentionally closes stderr. So, we arrange to have fd 10
32 (outside the range of interesting fd's during the test) set up to
33 duplicate the original stderr. */
34
35 #define BACKUP_STDERR_FILENO 10
36 static FILE *myerr;
37
38 #define ASSERT(expr) \
39 do \
40 { \
41 if (!(expr)) \
42 { \
43 fprintf (myerr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
44 fflush (myerr); \
45 abort (); \
46 } \
47 } \
48 while (0)
49
50 int
51 main ()
52 {
53 int i;
54 DIR *dp;
55 /* The dirent-safer module works without the use of fdopendir (which
56 would also pull in fchdir and openat); but if those modules were
57 also used, we ensure that they are safe. In particular, the
58 gnulib version of fdopendir is unable to guarantee that
59 dirfd(fdopendir(fd))==fd, but we can at least guarantee that if
60 they are not equal, the fd returned by dirfd is safe. */
61 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
62 int dfd;
63 #endif
64
65 /* We close fd 2 later, so save it in fd 10. */
66 if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
67 || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
68 return 2;
69
70 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
71 dfd = open (".", O_RDONLY);
72 ASSERT (STDERR_FILENO < dfd);
73 #endif
74
75 /* Four iterations, with progressively more standard descriptors
76 closed. */
77 for (i = -1; i <= STDERR_FILENO; i++)
78 {
79 if (0 <= i)
80 ASSERT (close (i) == 0);
81 dp = opendir (".");
82 ASSERT (dp);
83 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
84 ASSERT (closedir (dp) == 0);
85
86 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
87 {
88 int fd = dup_safer (dfd);
89 ASSERT (STDERR_FILENO < fd);
90 dp = fdopendir (fd);
91 ASSERT (dp);
92 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
93 ASSERT (closedir (dp) == 0);
94 errno = 0;
95 ASSERT (close (fd) == -1);
96 ASSERT (errno == EBADF);
97 }
98 #endif
99 }
100
101 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
102 ASSERT (close (dfd) == 0);
103 #endif
104
105 return 0;
106 }