Mercurial > gnulib
annotate tests/test-openat-safer.c @ 40057:b06060465f09
maint: Run 'make update-copyright'
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 01 Jan 2019 00:25:11 +0100 |
| parents | 49522e0c0097 |
| children | 7972ff22b3cf |
| rev | line source |
|---|---|
| 11937 | 1 /* Test that openat_safer leave standard fds alone. |
|
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2 Copyright (C) 2009-2019 Free Software Foundation, Inc. |
| 11937 | 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 | |
| 19190 | 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 11937 | 16 |
| 17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */ | |
| 18 | |
| 19 #include <config.h> | |
| 20 | |
| 21 #include "fcntl--.h" | |
| 22 | |
| 23 #include <errno.h> | |
| 24 #include <stdio.h> | |
| 25 #include <sys/stat.h> | |
| 26 #include <unistd.h> | |
| 27 | |
| 28 /* This test intentionally closes stderr. So, we arrange to have fd 10 | |
| 29 (outside the range of interesting fd's during the test) set up to | |
| 30 duplicate the original stderr. */ | |
| 31 | |
| 32 #define BACKUP_STDERR_FILENO 10 | |
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33 #define ASSERT_STREAM myerr |
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34 #include "macros.h" |
| 11937 | 35 |
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36 static FILE *myerr; |
| 11937 | 37 |
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38 #define witness "test-openat-safer.txt" |
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39 |
| 11937 | 40 int |
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41 main (void) |
| 11937 | 42 { |
| 43 int i; | |
| 44 int j; | |
| 45 int dfd; | |
| 46 int fd; | |
| 47 char buf[2]; | |
| 48 | |
| 49 /* We close fd 2 later, so save it in fd 10. */ | |
| 50 if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO | |
| 51 || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL) | |
| 52 return 2; | |
| 53 | |
| 54 /* Create handle for future use. */ | |
| 55 dfd = openat (AT_FDCWD, ".", O_RDONLY); | |
| 56 ASSERT (STDERR_FILENO < dfd); | |
| 57 | |
| 58 /* Create file for later checks. */ | |
| 59 remove (witness); | |
| 60 fd = openat (dfd, witness, O_WRONLY | O_CREAT | O_EXCL, 0600); | |
| 61 ASSERT (STDERR_FILENO < fd); | |
| 62 ASSERT (write (fd, "hi", 2) == 2); | |
| 63 ASSERT (close (fd) == 0); | |
| 64 | |
| 65 /* Four iterations, with progressively more standard descriptors | |
| 66 closed. */ | |
| 67 for (i = -1; i <= STDERR_FILENO; i++) | |
| 68 { | |
| 69 ASSERT (fchdir (dfd) == 0); | |
| 70 if (0 <= i) | |
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71 ASSERT (close (i) == 0); |
| 11937 | 72 |
| 73 /* Execute once in ".", once in "..". */ | |
| 74 for (j = 0; j <= 1; j++) | |
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75 { |
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76 if (j) |
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77 ASSERT (chdir ("..") == 0); |
| 11937 | 78 |
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79 /* Check for error detection. */ |
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80 errno = 0; |
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81 ASSERT (openat (AT_FDCWD, "", O_RDONLY) == -1); |
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82 ASSERT (errno == ENOENT); |
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83 errno = 0; |
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84 ASSERT (openat (dfd, "", O_RDONLY) == -1); |
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85 ASSERT (errno == ENOENT); |
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86 errno = 0; |
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87 ASSERT (openat (-1, ".", O_RDONLY) == -1); |
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88 ASSERT (errno == EBADF); |
| 11937 | 89 |
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90 /* Check for trailing slash and /dev/null handling. */ |
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91 errno = 0; |
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92 ASSERT (openat (dfd, "nonexist.ent/", O_CREAT | O_RDONLY, |
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93 S_IRUSR | S_IWUSR) == -1); |
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94 ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT |
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95 || errno == EINVAL); |
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96 errno = 0; |
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97 ASSERT (openat (dfd, witness "/", O_RDONLY) == -1); |
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98 ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL); |
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99 #ifdef __linux__ |
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100 /* Using a bad directory is okay for absolute paths. */ |
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101 fd = openat (-1, "/dev/null", O_WRONLY); |
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102 ASSERT (STDERR_FILENO < fd); |
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103 #endif |
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104 /* Using a non-directory is wrong for relative paths. */ |
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105 errno = 0; |
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106 fd = open ("/dev/null", O_RDONLY); |
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107 ASSERT (STDERR_FILENO < fd); |
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108 ASSERT (openat (fd, ".", O_RDONLY) == -1); |
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109 ASSERT (errno == EBADF || errno == ENOTDIR); |
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110 ASSERT (close (fd) == 0); |
| 11937 | 111 |
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112 /* Check for our witness file. */ |
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113 fd = openat (dfd, witness, O_RDONLY | O_NOFOLLOW); |
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114 ASSERT (STDERR_FILENO < fd); |
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115 ASSERT (read (fd, buf, 2) == 2); |
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116 ASSERT (buf[0] == 'h' && buf[1] == 'i'); |
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117 ASSERT (close (fd) == 0); |
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118 } |
| 11937 | 119 } |
| 120 ASSERT (fchdir (dfd) == 0); | |
| 121 ASSERT (unlink (witness) == 0); | |
| 122 ASSERT (close (dfd) == 0); | |
| 123 | |
| 124 return 0; | |
| 125 } |