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1 /***
2 This file is part of systemd.
3
4 Copyright 2013 Zbigniew Jędrzejewski-Szmek
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <stdio.h>
21 #include <sys/mount.h>
22 #include <unistd.h>
23
24 #include "alloc-util.h"
25 #include "fd-util.h"
26 #include "macro.h"
27 #include "mount-util.h"
28 #include "path-util.h"
29 #include "rm-rf.h"
30 #include "string-util.h"
31 #include "strv.h"
32 #include "util.h"
33
34 #define test_path_compare(a, b, result) { \
35 assert_se(path_compare(a, b) == result); \
36 assert_se(path_compare(b, a) == -result); \
37 assert_se(path_equal(a, b) == !result); \
38 assert_se(path_equal(b, a) == !result); \
39 }
40
41 static void test_path(void) {
42 _cleanup_close_ int fd = -1;
43
44 test_path_compare("/goo", "/goo", 0);
45 test_path_compare("/goo", "/goo", 0);
46 test_path_compare("//goo", "/goo", 0);
47 test_path_compare("//goo/////", "/goo", 0);
48 test_path_compare("goo/////", "goo", 0);
49
50 test_path_compare("/goo/boo", "/goo//boo", 0);
51 test_path_compare("//goo/boo", "/goo/boo//", 0);
52
53 test_path_compare("/", "///", 0);
54
55 test_path_compare("/x", "x/", 1);
56 test_path_compare("x/", "/", -1);
57
58 test_path_compare("/x/./y", "x/y", 1);
59 test_path_compare("x/.y", "x/y", -1);
60
61 test_path_compare("foo", "/foo", -1);
62 test_path_compare("/foo", "/foo/bar", -1);
63 test_path_compare("/foo/aaa", "/foo/b", -1);
64 test_path_compare("/foo/aaa", "/foo/b/a", -1);
65 test_path_compare("/foo/a", "/foo/aaa", -1);
66 test_path_compare("/foo/a/b", "/foo/aaa", -1);
67
68 assert_se(path_is_absolute("/"));
69 assert_se(!path_is_absolute("./"));
70
71 assert_se(is_path("/dir"));
72 assert_se(is_path("a/b"));
73 assert_se(!is_path("."));
74
75 assert_se(streq(basename("./aa/bb/../file.da."), "file.da."));
76 assert_se(streq(basename("/aa///.file"), ".file"));
77 assert_se(streq(basename("/aa///file..."), "file..."));
78 assert_se(streq(basename("file.../"), ""));
79
80 fd = open("/", O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY);
81 assert_se(fd >= 0);
82 assert_se(fd_is_mount_point(fd, "/", 0) > 0);
83
84 {
85 char p1[] = "aaa/bbb////ccc";
86 char p2[] = "//aaa/.////ccc";
87 char p3[] = "/./";
88
89 assert_se(path_equal(path_kill_slashes(p1), "aaa/bbb/ccc"));
90 assert_se(path_equal(path_kill_slashes(p2), "/aaa/./ccc"));
91 assert_se(path_equal(path_kill_slashes(p3), "/./"));
92 }
93 }
94
95 static void test_find_binary(const char *self) {
96 char *p;
97
98 assert_se(find_binary("/bin/sh", &p) == 0);
99 puts(p);
100 assert_se(path_equal(p, "/bin/sh"));
101 free(p);
102
103 assert_se(find_binary(self, &p) == 0);
104 puts(p);
105 assert_se(endswith(p, "/test-path-util"));
106 assert_se(path_is_absolute(p));
107 free(p);
108
109 assert_se(find_binary("sh", &p) == 0);
110 puts(p);
111 assert_se(endswith(p, "/sh"));
112 assert_se(path_is_absolute(p));
113 free(p);
114
115 assert_se(find_binary("xxxx-xxxx", &p) == -ENOENT);
116 assert_se(find_binary("/some/dir/xxxx-xxxx", &p) == -ENOENT);
117 }
118
119 static void test_prefixes(void) {
120 static const char* values[] = { "/a/b/c/d", "/a/b/c", "/a/b", "/a", "", NULL};
121 unsigned i;
122 char s[PATH_MAX];
123 bool b;
124
125 i = 0;
126 PATH_FOREACH_PREFIX_MORE(s, "/a/b/c/d") {
127 log_error("---%s---", s);
128 assert_se(streq(s, values[i++]));
129 }
130 assert_se(values[i] == NULL);
131
132 i = 1;
133 PATH_FOREACH_PREFIX(s, "/a/b/c/d") {
134 log_error("---%s---", s);
135 assert_se(streq(s, values[i++]));
136 }
137 assert_se(values[i] == NULL);
138
139 i = 0;
140 PATH_FOREACH_PREFIX_MORE(s, "////a////b////c///d///////")
141 assert_se(streq(s, values[i++]));
142 assert_se(values[i] == NULL);
143
144 i = 1;
145 PATH_FOREACH_PREFIX(s, "////a////b////c///d///////")
146 assert_se(streq(s, values[i++]));
147 assert_se(values[i] == NULL);
148
149 PATH_FOREACH_PREFIX(s, "////")
150 assert_not_reached("Wut?");
151
152 b = false;
153 PATH_FOREACH_PREFIX_MORE(s, "////") {
154 assert_se(!b);
155 assert_se(streq(s, ""));
156 b = true;
157 }
158 assert_se(b);
159
160 PATH_FOREACH_PREFIX(s, "")
161 assert_not_reached("wut?");
162
163 b = false;
164 PATH_FOREACH_PREFIX_MORE(s, "") {
165 assert_se(!b);
166 assert_se(streq(s, ""));
167 b = true;
168 }
169 }
170
171 static void test_path_join(void) {
172
173 #define test_join(root, path, rest, expected) { \
174 _cleanup_free_ char *z = NULL; \
175 z = path_join(root, path, rest); \
176 assert_se(streq(z, expected)); \
177 }
178
179 test_join("/root", "/a/b", "/c", "/root/a/b/c");
180 test_join("/root", "a/b", "c", "/root/a/b/c");
181 test_join("/root", "/a/b", "c", "/root/a/b/c");
182 test_join("/root", "/", "c", "/root/c");
183 test_join("/root", "/", NULL, "/root/");
184
185 test_join(NULL, "/a/b", "/c", "/a/b/c");
186 test_join(NULL, "a/b", "c", "a/b/c");
187 test_join(NULL, "/a/b", "c", "/a/b/c");
188 test_join(NULL, "/", "c", "/c");
189 test_join(NULL, "/", NULL, "/");
190 }
191
192 static void test_fsck_exists(void) {
193 /* Ensure we use a sane default for PATH. */
194 unsetenv("PATH");
195
196 /* fsck.minix is provided by util-linux and will probably exist. */
197 assert_se(fsck_exists("minix") == 1);
198
199 assert_se(fsck_exists("AbCdE") == 0);
200 assert_se(fsck_exists("/../bin/") == 0);
201 }
202
203 static void test_make_relative(void) {
204 char *result;
205
206 assert_se(path_make_relative("some/relative/path", "/some/path", &result) < 0);
207 assert_se(path_make_relative("/some/path", "some/relative/path", &result) < 0);
208
209 #define test(from_dir, to_path, expected) { \
210 _cleanup_free_ char *z = NULL; \
211 path_make_relative(from_dir, to_path, &z); \
212 assert_se(streq(z, expected)); \
213 }
214
215 test("/", "/", ".");
216 test("/", "/some/path", "some/path");
217 test("/some/path", "/some/path", ".");
218 test("/some/path", "/some/path/in/subdir", "in/subdir");
219 test("/some/path", "/", "../..");
220 test("/some/path", "/some/other/path", "../other/path");
221 test("//extra/////slashes///won't////fool///anybody//", "////extra///slashes////are/just///fine///", "../../../are/just/fine");
222 }
223
224 static void test_strv_resolve(void) {
225 char tmp_dir[] = "/tmp/test-path-util-XXXXXX";
226 _cleanup_strv_free_ char **search_dirs = NULL;
227 _cleanup_strv_free_ char **absolute_dirs = NULL;
228 char **d;
229
230 assert_se(mkdtemp(tmp_dir) != NULL);
231
232 search_dirs = strv_new("/dir1", "/dir2", "/dir3", NULL);
233 assert_se(search_dirs);
234 STRV_FOREACH(d, search_dirs) {
235 char *p = strappend(tmp_dir, *d);
236 assert_se(p);
237 assert_se(strv_push(&absolute_dirs, p) == 0);
238 }
239
240 assert_se(mkdir(absolute_dirs[0], 0700) == 0);
241 assert_se(mkdir(absolute_dirs[1], 0700) == 0);
242 assert_se(symlink("dir2", absolute_dirs[2]) == 0);
243
244 path_strv_resolve(search_dirs, tmp_dir);
245 assert_se(streq(search_dirs[0], "/dir1"));
246 assert_se(streq(search_dirs[1], "/dir2"));
247 assert_se(streq(search_dirs[2], "/dir2"));
248
249 assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
250 }
251
252 static void test_path_startswith(void) {
253 assert_se(path_startswith("/foo/bar/barfoo/", "/foo"));
254 assert_se(path_startswith("/foo/bar/barfoo/", "/foo/"));
255 assert_se(path_startswith("/foo/bar/barfoo/", "/"));
256 assert_se(path_startswith("/foo/bar/barfoo/", "////"));
257 assert_se(path_startswith("/foo/bar/barfoo/", "/foo//bar/////barfoo///"));
258 assert_se(path_startswith("/foo/bar/barfoo/", "/foo/bar/barfoo////"));
259 assert_se(path_startswith("/foo/bar/barfoo/", "/foo/bar///barfoo/"));
260 assert_se(path_startswith("/foo/bar/barfoo/", "/foo////bar/barfoo/"));
261 assert_se(path_startswith("/foo/bar/barfoo/", "////foo/bar/barfoo/"));
262 assert_se(path_startswith("/foo/bar/barfoo/", "/foo/bar/barfoo"));
263
264 assert_se(!path_startswith("/foo/bar/barfoo/", "/foo/bar/barfooa/"));
265 assert_se(!path_startswith("/foo/bar/barfoo/", "/foo/bar/barfooa"));
266 assert_se(!path_startswith("/foo/bar/barfoo/", ""));
267 assert_se(!path_startswith("/foo/bar/barfoo/", "/bar/foo"));
268 assert_se(!path_startswith("/foo/bar/barfoo/", "/f/b/b/"));
269 }
270
271 static void test_prefix_root_one(const char *r, const char *p, const char *expected) {
272 _cleanup_free_ char *s = NULL;
273 const char *t;
274
275 assert_se(s = prefix_root(r, p));
276 assert_se(streq_ptr(s, expected));
277
278 t = prefix_roota(r, p);
279 assert_se(t);
280 assert_se(streq_ptr(t, expected));
281 }
282
283 static void test_prefix_root(void) {
284 test_prefix_root_one("/", "/foo", "/foo");
285 test_prefix_root_one(NULL, "/foo", "/foo");
286 test_prefix_root_one("", "/foo", "/foo");
287 test_prefix_root_one("///", "/foo", "/foo");
288 test_prefix_root_one("/", "////foo", "/foo");
289 test_prefix_root_one(NULL, "////foo", "/foo");
290
291 test_prefix_root_one("/foo", "/bar", "/foo/bar");
292 test_prefix_root_one("/foo", "bar", "/foo/bar");
293 test_prefix_root_one("foo", "bar", "foo/bar");
294 test_prefix_root_one("/foo/", "/bar", "/foo/bar");
295 test_prefix_root_one("/foo/", "//bar", "/foo/bar");
296 test_prefix_root_one("/foo///", "//bar", "/foo/bar");
297 }
298
299 static void test_path_is_mount_point(void) {
300 int fd;
301 char tmp_dir[] = "/tmp/test-path-is-mount-point-XXXXXX";
302 _cleanup_free_ char *file1 = NULL, *file2 = NULL, *link1 = NULL, *link2 = NULL;
303 _cleanup_free_ char *dir1 = NULL, *dir1file = NULL, *dirlink1 = NULL, *dirlink1file = NULL;
304 _cleanup_free_ char *dir2 = NULL, *dir2file = NULL;
305
306 assert_se(path_is_mount_point("/", AT_SYMLINK_FOLLOW) > 0);
307 assert_se(path_is_mount_point("/", 0) > 0);
308
309 assert_se(path_is_mount_point("/proc", AT_SYMLINK_FOLLOW) > 0);
310 assert_se(path_is_mount_point("/proc", 0) > 0);
311
312 assert_se(path_is_mount_point("/proc/1", AT_SYMLINK_FOLLOW) == 0);
313 assert_se(path_is_mount_point("/proc/1", 0) == 0);
314
315 assert_se(path_is_mount_point("/sys", AT_SYMLINK_FOLLOW) > 0);
316 assert_se(path_is_mount_point("/sys", 0) > 0);
317
318 /* we'll create a hierarchy of different kinds of dir/file/link
319 * layouts:
320 *
321 * <tmp>/file1, <tmp>/file2
322 * <tmp>/link1 -> file1, <tmp>/link2 -> file2
323 * <tmp>/dir1/
324 * <tmp>/dir1/file
325 * <tmp>/dirlink1 -> dir1
326 * <tmp>/dirlink1file -> dirlink1/file
327 * <tmp>/dir2/
328 * <tmp>/dir2/file
329 */
330
331 /* file mountpoints */
332 assert_se(mkdtemp(tmp_dir) != NULL);
333 file1 = path_join(NULL, tmp_dir, "file1");
334 assert_se(file1);
335 file2 = path_join(NULL, tmp_dir, "file2");
336 assert_se(file2);
337 fd = open(file1, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
338 assert_se(fd > 0);
339 close(fd);
340 fd = open(file2, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
341 assert_se(fd > 0);
342 close(fd);
343 link1 = path_join(NULL, tmp_dir, "link1");
344 assert_se(link1);
345 assert_se(symlink("file1", link1) == 0);
346 link2 = path_join(NULL, tmp_dir, "link2");
347 assert_se(link1);
348 assert_se(symlink("file2", link2) == 0);
349
350 assert_se(path_is_mount_point(file1, AT_SYMLINK_FOLLOW) == 0);
351 assert_se(path_is_mount_point(file1, 0) == 0);
352 assert_se(path_is_mount_point(link1, AT_SYMLINK_FOLLOW) == 0);
353 assert_se(path_is_mount_point(link1, 0) == 0);
354
355 /* directory mountpoints */
356 dir1 = path_join(NULL, tmp_dir, "dir1");
357 assert_se(dir1);
358 assert_se(mkdir(dir1, 0755) == 0);
359 dirlink1 = path_join(NULL, tmp_dir, "dirlink1");
360 assert_se(dirlink1);
361 assert_se(symlink("dir1", dirlink1) == 0);
362 dirlink1file = path_join(NULL, tmp_dir, "dirlink1file");
363 assert_se(dirlink1file);
364 assert_se(symlink("dirlink1/file", dirlink1file) == 0);
365 dir2 = path_join(NULL, tmp_dir, "dir2");
366 assert_se(dir2);
367 assert_se(mkdir(dir2, 0755) == 0);
368
369 assert_se(path_is_mount_point(dir1, AT_SYMLINK_FOLLOW) == 0);
370 assert_se(path_is_mount_point(dir1, 0) == 0);
371 assert_se(path_is_mount_point(dirlink1, AT_SYMLINK_FOLLOW) == 0);
372 assert_se(path_is_mount_point(dirlink1, 0) == 0);
373
374 /* file in subdirectory mountpoints */
375 dir1file = path_join(NULL, dir1, "file");
376 assert_se(dir1file);
377 fd = open(dir1file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
378 assert_se(fd > 0);
379 close(fd);
380
381 assert_se(path_is_mount_point(dir1file, AT_SYMLINK_FOLLOW) == 0);
382 assert_se(path_is_mount_point(dir1file, 0) == 0);
383 assert_se(path_is_mount_point(dirlink1file, AT_SYMLINK_FOLLOW) == 0);
384 assert_se(path_is_mount_point(dirlink1file, 0) == 0);
385
386 /* these tests will only work as root */
387 if (mount(file1, file2, NULL, MS_BIND, NULL) >= 0) {
388 int rt, rf, rlt, rlf, rl1t, rl1f;
389
390 /* files */
391 /* capture results in vars, to avoid dangling mounts on failure */
392 rf = path_is_mount_point(file2, 0);
393 rt = path_is_mount_point(file2, AT_SYMLINK_FOLLOW);
394 rlf = path_is_mount_point(link2, 0);
395 rlt = path_is_mount_point(link2, AT_SYMLINK_FOLLOW);
396
397 assert_se(umount(file2) == 0);
398
399 assert_se(rf == 1);
400 assert_se(rt == 1);
401 assert_se(rlf == 0);
402 assert_se(rlt == 1);
403
404 /* dirs */
405 dir2file = path_join(NULL, dir2, "file");
406 assert_se(dir2file);
407 fd = open(dir2file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
408 assert_se(fd > 0);
409 close(fd);
410
411 assert_se(mount(dir2, dir1, NULL, MS_BIND, NULL) >= 0);
412
413 rf = path_is_mount_point(dir1, 0);
414 rt = path_is_mount_point(dir1, AT_SYMLINK_FOLLOW);
415 rlf = path_is_mount_point(dirlink1, 0);
416 rlt = path_is_mount_point(dirlink1, AT_SYMLINK_FOLLOW);
417 /* its parent is a mount point, but not /file itself */
418 rl1f = path_is_mount_point(dirlink1file, 0);
419 rl1t = path_is_mount_point(dirlink1file, AT_SYMLINK_FOLLOW);
420
421 assert_se(umount(dir1) == 0);
422
423 assert_se(rf == 1);
424 assert_se(rt == 1);
425 assert_se(rlf == 0);
426 assert_se(rlt == 1);
427 assert_se(rl1f == 0);
428 assert_se(rl1t == 0);
429
430 } else
431 printf("Skipping bind mount file test: %m\n");
432
433 assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
434 }
435
436 int main(int argc, char **argv) {
437 test_path();
438 test_find_binary(argv[0]);
439 test_prefixes();
440 test_path_join();
441 test_fsck_exists();
442 test_make_relative();
443 test_strv_resolve();
444 test_path_startswith();
445 test_prefix_root();
446 test_path_is_mount_point();
447
448 return 0;
449 }