1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 #include "alloc-util.h"
10 #include "id128-util.h"
13 #include "path-util.h"
15 #include "stdio-util.h"
16 #include "string-util.h"
18 #include "user-util.h"
21 static void test_chase_symlinks(void) {
22 _cleanup_free_ char *result = NULL;
23 char temp[] = "/tmp/test-chase.XXXXXX";
24 const char *top, *p, *pslash, *q, *qslash;
27 assert_se(mkdtemp(temp));
29 top = strjoina(temp, "/top");
30 assert_se(mkdir(top, 0700) >= 0);
32 p = strjoina(top, "/dot");
33 assert_se(symlink(".", p) >= 0);
35 p = strjoina(top, "/dotdot");
36 assert_se(symlink("..", p) >= 0);
38 p = strjoina(top, "/dotdota");
39 assert_se(symlink("../a", p) >= 0);
41 p = strjoina(temp, "/a");
42 assert_se(symlink("b", p) >= 0);
44 p = strjoina(temp, "/b");
45 assert_se(symlink("/usr", p) >= 0);
47 p = strjoina(temp, "/start");
48 assert_se(symlink("top/dot/dotdota", p) >= 0);
50 /* Paths that use symlinks underneath the "root" */
52 r = chase_symlinks(p, NULL, 0, &result);
54 assert_se(path_equal(result, "/usr"));
55 result = mfree(result);
57 pslash = strjoina(p, "/");
58 r = chase_symlinks(pslash, NULL, 0, &result);
60 assert_se(path_equal(result, "/usr/"));
61 result = mfree(result);
63 r = chase_symlinks(p, temp, 0, &result);
64 assert_se(r == -ENOENT);
66 r = chase_symlinks(pslash, temp, 0, &result);
67 assert_se(r == -ENOENT);
69 q = strjoina(temp, "/usr");
71 r = chase_symlinks(p, temp, CHASE_NONEXISTENT, &result);
73 assert_se(path_equal(result, q));
74 result = mfree(result);
76 qslash = strjoina(q, "/");
78 r = chase_symlinks(pslash, temp, CHASE_NONEXISTENT, &result);
80 assert_se(path_equal(result, qslash));
81 result = mfree(result);
83 assert_se(mkdir(q, 0700) >= 0);
85 r = chase_symlinks(p, temp, 0, &result);
87 assert_se(path_equal(result, q));
88 result = mfree(result);
90 r = chase_symlinks(pslash, temp, 0, &result);
92 assert_se(path_equal(result, qslash));
93 result = mfree(result);
95 p = strjoina(temp, "/slash");
96 assert_se(symlink("/", p) >= 0);
98 r = chase_symlinks(p, NULL, 0, &result);
100 assert_se(path_equal(result, "/"));
101 result = mfree(result);
103 r = chase_symlinks(p, temp, 0, &result);
105 assert_se(path_equal(result, temp));
106 result = mfree(result);
108 /* Paths that would "escape" outside of the "root" */
110 p = strjoina(temp, "/6dots");
111 assert_se(symlink("../../..", p) >= 0);
113 r = chase_symlinks(p, temp, 0, &result);
114 assert_se(r > 0 && path_equal(result, temp));
115 result = mfree(result);
117 p = strjoina(temp, "/6dotsusr");
118 assert_se(symlink("../../../usr", p) >= 0);
120 r = chase_symlinks(p, temp, 0, &result);
121 assert_se(r > 0 && path_equal(result, q));
122 result = mfree(result);
124 p = strjoina(temp, "/top/8dotsusr");
125 assert_se(symlink("../../../../usr", p) >= 0);
127 r = chase_symlinks(p, temp, 0, &result);
128 assert_se(r > 0 && path_equal(result, q));
129 result = mfree(result);
131 /* Paths that contain repeated slashes */
133 p = strjoina(temp, "/slashslash");
134 assert_se(symlink("///usr///", p) >= 0);
136 r = chase_symlinks(p, NULL, 0, &result);
138 assert_se(path_equal(result, "/usr"));
139 result = mfree(result);
141 r = chase_symlinks(p, temp, 0, &result);
143 assert_se(path_equal(result, q));
144 result = mfree(result);
148 r = chase_symlinks("/etc/./.././", NULL, 0, &result);
150 assert_se(path_equal(result, "/"));
151 result = mfree(result);
153 r = chase_symlinks("/etc/./.././", "/etc", 0, &result);
154 assert_se(r > 0 && path_equal(result, "/etc"));
155 result = mfree(result);
157 r = chase_symlinks("/../.././//../../etc", NULL, 0, &result);
159 assert_se(streq(result, "/etc"));
160 result = mfree(result);
162 r = chase_symlinks("/../.././//../../test-chase.fsldajfl", NULL, CHASE_NONEXISTENT, &result);
164 assert_se(streq(result, "/test-chase.fsldajfl"));
165 result = mfree(result);
167 r = chase_symlinks("/../.././//../../etc", "/", CHASE_PREFIX_ROOT, &result);
169 assert_se(streq(result, "/etc"));
170 result = mfree(result);
172 r = chase_symlinks("/../.././//../../test-chase.fsldajfl", "/", CHASE_PREFIX_ROOT|CHASE_NONEXISTENT, &result);
174 assert_se(streq(result, "/test-chase.fsldajfl"));
175 result = mfree(result);
177 r = chase_symlinks("/etc/machine-id/foo", NULL, 0, &result);
178 assert_se(r == -ENOTDIR);
179 result = mfree(result);
181 /* Path that loops back to self */
183 p = strjoina(temp, "/recursive-symlink");
184 assert_se(symlink("recursive-symlink", p) >= 0);
185 r = chase_symlinks(p, NULL, 0, &result);
186 assert_se(r == -ELOOP);
188 /* Path which doesn't exist */
190 p = strjoina(temp, "/idontexist");
191 r = chase_symlinks(p, NULL, 0, &result);
192 assert_se(r == -ENOENT);
194 r = chase_symlinks(p, NULL, CHASE_NONEXISTENT, &result);
196 assert_se(path_equal(result, p));
197 result = mfree(result);
199 p = strjoina(temp, "/idontexist/meneither");
200 r = chase_symlinks(p, NULL, 0, &result);
201 assert_se(r == -ENOENT);
203 r = chase_symlinks(p, NULL, CHASE_NONEXISTENT, &result);
205 assert_se(path_equal(result, p));
206 result = mfree(result);
208 /* Path which doesn't exist, but contains weird stuff */
210 p = strjoina(temp, "/idontexist/..");
211 r = chase_symlinks(p, NULL, 0, &result);
212 assert_se(r == -ENOENT);
214 r = chase_symlinks(p, NULL, CHASE_NONEXISTENT, &result);
215 assert_se(r == -ENOENT);
217 p = strjoina(temp, "/target");
218 q = strjoina(temp, "/top");
219 assert_se(symlink(q, p) >= 0);
220 p = strjoina(temp, "/target/idontexist");
221 r = chase_symlinks(p, NULL, 0, &result);
222 assert_se(r == -ENOENT);
224 if (geteuid() == 0) {
225 p = strjoina(temp, "/priv1");
226 assert_se(mkdir(p, 0755) >= 0);
228 q = strjoina(p, "/priv2");
229 assert_se(mkdir(q, 0755) >= 0);
231 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
233 assert_se(chown(q, UID_NOBODY, GID_NOBODY) >= 0);
234 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
236 assert_se(chown(p, UID_NOBODY, GID_NOBODY) >= 0);
237 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
239 assert_se(chown(q, 0, 0) >= 0);
240 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) == -EPERM);
242 assert_se(rmdir(q) >= 0);
243 assert_se(symlink("/etc/passwd", q) >= 0);
244 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) == -EPERM);
246 assert_se(chown(p, 0, 0) >= 0);
247 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
250 p = strjoina(temp, "/machine-id-test");
251 assert_se(symlink("/usr/../etc/./machine-id", p) >= 0);
253 pfd = chase_symlinks(p, NULL, CHASE_OPEN, NULL);
254 if (pfd != -ENOENT) {
255 _cleanup_close_ int fd = -1;
260 fd = fd_reopen(pfd, O_RDONLY|O_CLOEXEC);
264 assert_se(id128_read_fd(fd, ID128_PLAIN, &a) >= 0);
265 assert_se(sd_id128_get_machine(&b) >= 0);
266 assert_se(sd_id128_equal(a, b));
271 p = strjoina(temp, "/start");
272 r = chase_symlinks(p, NULL, CHASE_STEP, &result);
274 p = strjoina(temp, "/top/dot/dotdota");
275 assert_se(streq(p, result));
276 result = mfree(result);
278 r = chase_symlinks(p, NULL, CHASE_STEP, &result);
280 p = strjoina(temp, "/top/./dotdota");
281 assert_se(streq(p, result));
282 result = mfree(result);
284 r = chase_symlinks(p, NULL, CHASE_STEP, &result);
286 p = strjoina(temp, "/top/../a");
287 assert_se(streq(p, result));
288 result = mfree(result);
290 r = chase_symlinks(p, NULL, CHASE_STEP, &result);
292 p = strjoina(temp, "/a");
293 assert_se(streq(p, result));
294 result = mfree(result);
296 r = chase_symlinks(p, NULL, CHASE_STEP, &result);
298 p = strjoina(temp, "/b");
299 assert_se(streq(p, result));
300 result = mfree(result);
302 r = chase_symlinks(p, NULL, CHASE_STEP, &result);
304 assert_se(streq("/usr", result));
305 result = mfree(result);
307 r = chase_symlinks("/usr", NULL, CHASE_STEP, &result);
309 assert_se(streq("/usr", result));
310 result = mfree(result);
312 assert_se(rm_rf(temp, REMOVE_ROOT|REMOVE_PHYSICAL) >= 0);
315 static void test_unlink_noerrno(void) {
316 char name[] = "/tmp/test-close_nointr.XXXXXX";
319 fd = mkostemp_safe(name);
321 assert_se(close_nointr(fd) >= 0);
326 assert_se(unlink_noerrno(name) >= 0);
327 assert_se(errno == -42);
328 assert_se(unlink_noerrno(name) < 0);
329 assert_se(errno == -42);
333 static void test_readlink_and_make_absolute(void) {
334 char tempdir[] = "/tmp/test-readlink_and_make_absolute";
335 char name[] = "/tmp/test-readlink_and_make_absolute/original";
336 char name2[] = "test-readlink_and_make_absolute/original";
337 char name_alias[] = "/tmp/test-readlink_and_make_absolute-alias";
339 _cleanup_free_ char *pwd = NULL;
341 assert_se(mkdir_safe(tempdir, 0755, getuid(), getgid(), MKDIR_WARN_MODE) >= 0);
342 assert_se(touch(name) >= 0);
344 assert_se(symlink(name, name_alias) >= 0);
345 assert_se(readlink_and_make_absolute(name_alias, &r) >= 0);
346 assert_se(streq(r, name));
348 assert_se(unlink(name_alias) >= 0);
350 assert_se(safe_getcwd(&pwd) >= 0);
352 assert_se(chdir(tempdir) >= 0);
353 assert_se(symlink(name2, name_alias) >= 0);
354 assert_se(readlink_and_make_absolute(name_alias, &r) >= 0);
355 assert_se(streq(r, name));
357 assert_se(unlink(name_alias) >= 0);
359 assert_se(chdir(pwd) >= 0);
361 assert_se(rm_rf(tempdir, REMOVE_ROOT|REMOVE_PHYSICAL) >= 0);
364 static void test_get_files_in_directory(void) {
365 _cleanup_strv_free_ char **l = NULL, **t = NULL;
367 assert_se(get_files_in_directory("/tmp", &l) >= 0);
368 assert_se(get_files_in_directory(".", &t) >= 0);
369 assert_se(get_files_in_directory(".", NULL) >= 0);
372 #if 0 /// UNNEEDED by elogind
373 static void test_var_tmp(void) {
374 _cleanup_free_ char *tmpdir_backup = NULL, *temp_backup = NULL, *tmp_backup = NULL;
375 const char *tmp_dir = NULL, *t;
377 t = getenv("TMPDIR");
379 tmpdir_backup = strdup(t);
380 assert_se(tmpdir_backup);
385 temp_backup = strdup(t);
386 assert_se(temp_backup);
391 tmp_backup = strdup(t);
392 assert_se(tmp_backup);
395 assert_se(unsetenv("TMPDIR") >= 0);
396 assert_se(unsetenv("TEMP") >= 0);
397 assert_se(unsetenv("TMP") >= 0);
399 assert_se(var_tmp_dir(&tmp_dir) >= 0);
400 assert_se(streq(tmp_dir, "/var/tmp"));
402 assert_se(setenv("TMPDIR", "/tmp", true) >= 0);
403 assert_se(streq(getenv("TMPDIR"), "/tmp"));
405 assert_se(var_tmp_dir(&tmp_dir) >= 0);
406 assert_se(streq(tmp_dir, "/tmp"));
408 assert_se(setenv("TMPDIR", "/88_does_not_exist_88", true) >= 0);
409 assert_se(streq(getenv("TMPDIR"), "/88_does_not_exist_88"));
411 assert_se(var_tmp_dir(&tmp_dir) >= 0);
412 assert_se(streq(tmp_dir, "/var/tmp"));
415 assert_se(setenv("TMPDIR", tmpdir_backup, true) >= 0);
416 assert_se(streq(getenv("TMPDIR"), tmpdir_backup));
420 assert_se(setenv("TEMP", temp_backup, true) >= 0);
421 assert_se(streq(getenv("TEMP"), temp_backup));
425 assert_se(setenv("TMP", tmp_backup, true) >= 0);
426 assert_se(streq(getenv("TMP"), tmp_backup));
431 static void test_dot_or_dot_dot(void) {
432 assert_se(!dot_or_dot_dot(NULL));
433 assert_se(!dot_or_dot_dot(""));
434 assert_se(!dot_or_dot_dot("xxx"));
435 assert_se(dot_or_dot_dot("."));
436 assert_se(dot_or_dot_dot(".."));
437 assert_se(!dot_or_dot_dot(".foo"));
438 assert_se(!dot_or_dot_dot("..foo"));
441 #if 0 /// Uses functions that elogind does not need
442 static void test_access_fd(void) {
443 _cleanup_(rmdir_and_freep) char *p = NULL;
444 _cleanup_close_ int fd = -1;
446 assert_se(mkdtemp_malloc("/tmp/access-fd.XXXXXX", &p) >= 0);
448 fd = open(p, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
451 assert_se(access_fd(fd, R_OK) >= 0);
452 assert_se(access_fd(fd, F_OK) >= 0);
453 assert_se(access_fd(fd, W_OK) >= 0);
455 assert_se(fchmod(fd, 0000) >= 0);
457 assert_se(access_fd(fd, F_OK) >= 0);
459 if (geteuid() == 0) {
460 assert_se(access_fd(fd, R_OK) >= 0);
461 assert_se(access_fd(fd, W_OK) >= 0);
463 assert_se(access_fd(fd, R_OK) == -EACCES);
464 assert_se(access_fd(fd, W_OK) == -EACCES);
468 static void test_touch_file(void) {
469 uid_t test_uid, test_gid;
470 _cleanup_(rm_rf_physical_and_freep) char *p = NULL;
475 test_uid = geteuid() == 0 ? 65534 : getuid();
476 test_gid = geteuid() == 0 ? 65534 : getgid();
478 test_mtime = usec_sub_unsigned(now(CLOCK_REALTIME), USEC_PER_WEEK);
480 assert_se(mkdtemp_malloc("/dev/shm/touch-file-XXXXXX", &p) >= 0);
482 a = strjoina(p, "/regular");
483 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
484 assert_se(lstat(a, &st) >= 0);
485 assert_se(st.st_uid == test_uid);
486 assert_se(st.st_gid == test_gid);
487 assert_se(S_ISREG(st.st_mode));
488 assert_se((st.st_mode & 0777) == 0640);
489 assert_se(timespec_load(&st.st_mtim) == test_mtime);
491 a = strjoina(p, "/dir");
492 assert_se(mkdir(a, 0775) >= 0);
493 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
494 assert_se(lstat(a, &st) >= 0);
495 assert_se(st.st_uid == test_uid);
496 assert_se(st.st_gid == test_gid);
497 assert_se(S_ISDIR(st.st_mode));
498 assert_se((st.st_mode & 0777) == 0640);
499 assert_se(timespec_load(&st.st_mtim) == test_mtime);
501 a = strjoina(p, "/fifo");
502 assert_se(mkfifo(a, 0775) >= 0);
503 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
504 assert_se(lstat(a, &st) >= 0);
505 assert_se(st.st_uid == test_uid);
506 assert_se(st.st_gid == test_gid);
507 assert_se(S_ISFIFO(st.st_mode));
508 assert_se((st.st_mode & 0777) == 0640);
509 assert_se(timespec_load(&st.st_mtim) == test_mtime);
511 a = strjoina(p, "/sock");
512 assert_se(mknod(a, 0775 | S_IFSOCK, 0) >= 0);
513 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
514 assert_se(lstat(a, &st) >= 0);
515 assert_se(st.st_uid == test_uid);
516 assert_se(st.st_gid == test_gid);
517 assert_se(S_ISSOCK(st.st_mode));
518 assert_se((st.st_mode & 0777) == 0640);
519 assert_se(timespec_load(&st.st_mtim) == test_mtime);
521 if (geteuid() == 0) {
522 a = strjoina(p, "/cdev");
523 assert_se(mknod(a, 0775 | S_IFCHR, makedev(0, 0)) >= 0);
524 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
525 assert_se(lstat(a, &st) >= 0);
526 assert_se(st.st_uid == test_uid);
527 assert_se(st.st_gid == test_gid);
528 assert_se(S_ISCHR(st.st_mode));
529 assert_se((st.st_mode & 0777) == 0640);
530 assert_se(timespec_load(&st.st_mtim) == test_mtime);
532 a = strjoina(p, "/bdev");
533 assert_se(mknod(a, 0775 | S_IFBLK, makedev(0, 0)) >= 0);
534 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
535 assert_se(lstat(a, &st) >= 0);
536 assert_se(st.st_uid == test_uid);
537 assert_se(st.st_gid == test_gid);
538 assert_se(S_ISBLK(st.st_mode));
539 assert_se((st.st_mode & 0777) == 0640);
540 assert_se(timespec_load(&st.st_mtim) == test_mtime);
543 a = strjoina(p, "/lnk");
544 assert_se(symlink("target", a) >= 0);
545 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
546 assert_se(lstat(a, &st) >= 0);
547 assert_se(st.st_uid == test_uid);
548 assert_se(st.st_gid == test_gid);
549 assert_se(S_ISLNK(st.st_mode));
550 assert_se((st.st_mode & 0777) == 0640);
551 assert_se(timespec_load(&st.st_mtim) == test_mtime);
554 static void test_unlinkat_deallocate(void) {
555 _cleanup_free_ char *p = NULL;
556 _cleanup_close_ int fd = -1;
559 assert_se(tempfn_random_child(NULL, "unlink-deallocation", &p) >= 0);
561 fd = open(p, O_WRONLY|O_CLOEXEC|O_CREAT|O_EXCL, 0600);
564 assert_se(write(fd, "hallo\n", 6) == 6);
566 assert_se(fstat(fd, &st) >= 0);
567 assert_se(st.st_size == 6);
568 assert_se(st.st_blocks > 0);
569 assert_se(st.st_nlink == 1);
571 assert_se(unlinkat_deallocate(AT_FDCWD, p, 0) >= 0);
573 assert_se(fstat(fd, &st) >= 0);
574 assert_se(IN_SET(st.st_size, 0, 6)); /* depending on whether hole punching worked the size will be 6 (it worked) or 0 (we had to resort to truncation) */
575 assert_se(st.st_blocks == 0);
576 assert_se(st.st_nlink == 0);
580 static void test_fsync_directory_of_file(void) {
581 _cleanup_close_ int fd = -1;
583 fd = open_tmpfile_unlinkable(NULL, O_RDWR);
586 assert_se(fsync_directory_of_file(fd) >= 0);
589 int main(int argc, char *argv[]) {
590 test_unlink_noerrno();
591 test_get_files_in_directory();
592 test_readlink_and_make_absolute();
593 #if 0 /// UNNEEDED by elogind
596 test_chase_symlinks();
597 test_dot_or_dot_dot();
598 #if 0 /// Uses functions that elogind does not need
601 test_unlinkat_deallocate();
603 test_fsync_directory_of_file();