1 | /* Test glob danglin symlink match (BZ #866). |
2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdio.h> |
20 | #include <string.h> |
21 | #include <stdlib.h> |
22 | #include <errno.h> |
23 | #include <unistd.h> |
24 | #include <limits.h> |
25 | #include <stddef.h> |
26 | #include <glob.h> |
27 | #include <sys/stat.h> |
28 | #include <sys/types.h> |
29 | |
30 | #include <support/check.h> |
31 | #include <support/temp_file.h> |
32 | |
33 | static void do_prepare (int argc, char *argv[]); |
34 | #define PREPARE do_prepare |
35 | static int do_test (void); |
36 | #include <support/test-driver.c> |
37 | |
38 | /* Maximum number of symlink calls for create_link function. */ |
39 | #define MAX_CREATE_LINK_TRIES 10 |
40 | |
41 | static void |
42 | create_link (const char *base, const char *fname, char *linkname, |
43 | size_t linknamesize) |
44 | { |
45 | int ntries = 0; |
46 | while (1) |
47 | { |
48 | snprintf (s: linkname, maxlen: linknamesize, format: "%s/%s%02d" , test_dir, base, |
49 | ntries); |
50 | if (symlink (from: fname, to: linkname) == 0) |
51 | break; |
52 | if (errno != EEXIST) |
53 | FAIL_EXIT1 ("symlink failed: %m" ); |
54 | if (ntries++ == MAX_CREATE_LINK_TRIES) |
55 | FAIL_EXIT1 ("symlink failed with EEXIST too many times" ); |
56 | } |
57 | add_temp_file (name: linkname); |
58 | } |
59 | |
60 | #ifndef PATH_MAX |
61 | # define PATH_MAX 1024 |
62 | #endif |
63 | static char valid_link[PATH_MAX]; |
64 | static char dangling_link[PATH_MAX]; |
65 | static char dangling_dir[PATH_MAX]; |
66 | |
67 | static void |
68 | do_prepare (int argc, char *argv[]) |
69 | { |
70 | char *fname; |
71 | |
72 | create_temp_file (base: "tst-glob_symlinks." , filename: &fname); |
73 | |
74 | /* Create an existing symlink. */ |
75 | create_link (base: "valid-symlink-tst-glob_symlinks" , fname, linkname: valid_link, |
76 | linknamesize: sizeof valid_link); |
77 | |
78 | /* Create a dangling symlink to a file. */ |
79 | int fd = create_temp_file (base: "dangling-tst-glob_file" , filename: &fname); |
80 | TEST_VERIFY_EXIT (close (fd) == 0); |
81 | /* It throws a warning at process end due 'add_temp_file' trying to |
82 | unlink it again. */ |
83 | TEST_VERIFY_EXIT (unlink (fname) == 0); |
84 | create_link (base: "dangling-symlink-file-tst-glob" , fname, linkname: dangling_link, |
85 | linknamesize: sizeof dangling_link); |
86 | |
87 | /* Create a dangling symlink to a directory. */ |
88 | char tmpdir[PATH_MAX]; |
89 | snprintf (s: tmpdir, maxlen: sizeof tmpdir, format: "%s/dangling-tst-glob_folder.XXXXXX" , |
90 | test_dir); |
91 | TEST_VERIFY_EXIT (mkdtemp (tmpdir) != NULL); |
92 | create_link (base: "dangling-symlink-dir-tst-glob" , fname: tmpdir, linkname: dangling_dir, |
93 | linknamesize: sizeof dangling_dir); |
94 | TEST_VERIFY_EXIT (rmdir (tmpdir) == 0); |
95 | } |
96 | |
97 | static int |
98 | do_test (void) |
99 | { |
100 | char buf[PATH_MAX + 1]; |
101 | glob_t gl; |
102 | |
103 | TEST_VERIFY_EXIT (glob (valid_link, 0, NULL, &gl) == 0); |
104 | TEST_VERIFY_EXIT (gl.gl_pathc == 1); |
105 | TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], valid_link) == 0); |
106 | globfree (&gl); |
107 | |
108 | TEST_VERIFY_EXIT (glob (dangling_link, 0, NULL, &gl) == 0); |
109 | TEST_VERIFY_EXIT (gl.gl_pathc == 1); |
110 | TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0); |
111 | globfree (&gl); |
112 | |
113 | TEST_VERIFY_EXIT (glob (dangling_dir, 0, NULL, &gl) == 0); |
114 | TEST_VERIFY_EXIT (gl.gl_pathc == 1); |
115 | TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_dir) == 0); |
116 | globfree (&gl); |
117 | |
118 | snprintf (s: buf, maxlen: sizeof buf, format: "%s" , dangling_link); |
119 | buf[strlen(buf) - 1] = '?'; |
120 | TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) == 0); |
121 | TEST_VERIFY_EXIT (gl.gl_pathc == 1); |
122 | TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0); |
123 | globfree (&gl); |
124 | |
125 | /* glob should handle dangling symbol as normal file, so <file>? should |
126 | return an empty string. */ |
127 | snprintf (s: buf, maxlen: sizeof buf, format: "%s?" , dangling_link); |
128 | TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) != 0); |
129 | globfree (&gl); |
130 | |
131 | snprintf (s: buf, maxlen: sizeof buf, format: "%s*" , dangling_link); |
132 | TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) == 0); |
133 | TEST_VERIFY_EXIT (gl.gl_pathc == 1); |
134 | TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0); |
135 | globfree (&gl); |
136 | |
137 | return 0; |
138 | } |
139 | |