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a42089bd JG |
1 | /* |
2 | * Copyright (C) 2019 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
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, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #include <common/compat/directory-handle.h> | |
19 | #include <common/error.h> | |
20 | #include <common/macros.h> | |
21 | #include <common/runas.h> | |
22 | #include <common/credentials.h> | |
23 | #include <lttng/constant.h> | |
fcde531a | 24 | #include <common/dynamic-array.h> |
a42089bd JG |
25 | |
26 | #include <assert.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/stat.h> | |
29 | #include <fcntl.h> | |
30 | #include <unistd.h> | |
fcde531a | 31 | #include <dirent.h> |
a42089bd | 32 | |
a4ee1b7e JG |
33 | /* |
34 | * This compatibility layer shares a common "base" that is implemented | |
35 | * in terms of an internal API. This file contains two implementations | |
36 | * of the internal API below. | |
37 | */ | |
a42089bd JG |
38 | static |
39 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, | |
40 | const char *path, struct stat *st); | |
41 | static | |
42 | int lttng_directory_handle_mkdir( | |
43 | const struct lttng_directory_handle *handle, | |
44 | const char *path, mode_t mode); | |
45 | static | |
46 | int _run_as_mkdir(const struct lttng_directory_handle *handle, const char *path, | |
47 | mode_t mode, uid_t uid, gid_t gid); | |
48 | static | |
49 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, | |
50 | const char *path, mode_t mode, uid_t uid, gid_t gid); | |
a0c5463e | 51 | static |
a4ee1b7e JG |
52 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
53 | const char *filename, int flags, mode_t mode); | |
54 | static | |
55 | int _run_as_open(const struct lttng_directory_handle *handle, | |
56 | const char *filename, | |
57 | int flags, mode_t mode, uid_t uid, gid_t gid); | |
58 | static | |
59 | int lttng_directory_handle_unlink( | |
60 | const struct lttng_directory_handle *handle, | |
61 | const char *filename); | |
62 | static | |
63 | int _run_as_unlink(const struct lttng_directory_handle *handle, | |
64 | const char *filename, uid_t uid, gid_t gid); | |
65 | static | |
fcde531a JG |
66 | int _lttng_directory_handle_rename( |
67 | const struct lttng_directory_handle *old_handle, | |
68 | const char *old_name, | |
69 | const struct lttng_directory_handle *new_handle, | |
70 | const char *new_name); | |
71 | static | |
72 | int _run_as_rename(const struct lttng_directory_handle *old_handle, | |
73 | const char *old_name, | |
74 | const struct lttng_directory_handle *new_handle, | |
75 | const char *new_name, uid_t uid, gid_t gid); | |
76 | static | |
77 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, | |
78 | const char *path); | |
79 | static | |
80 | int lttng_directory_handle_rmdir( | |
81 | const struct lttng_directory_handle *handle, const char *name); | |
82 | static | |
83 | int _run_as_rmdir(const struct lttng_directory_handle *handle, | |
84 | const char *name, uid_t uid, gid_t gid); | |
85 | static | |
86 | int _run_as_rmdir_recursive( | |
87 | const struct lttng_directory_handle *handle, const char *name, | |
58ec7253 | 88 | uid_t uid, gid_t gid, int flags); |
fcde531a | 89 | static |
a0c5463e | 90 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle); |
a42089bd JG |
91 | |
92 | #ifdef COMPAT_DIRFD | |
93 | ||
94 | LTTNG_HIDDEN | |
d44a713b | 95 | int lttng_directory_handle_init(struct lttng_directory_handle *new_handle, |
a42089bd | 96 | const char *path) |
d44a713b JG |
97 | { |
98 | const struct lttng_directory_handle cwd_handle = { | |
99 | .dirfd = AT_FDCWD, | |
100 | }; | |
101 | ||
102 | /* Open a handle to the CWD if NULL is passed. */ | |
103 | return lttng_directory_handle_init_from_handle(new_handle, | |
104 | path, | |
105 | &cwd_handle); | |
106 | } | |
107 | ||
108 | LTTNG_HIDDEN | |
109 | int lttng_directory_handle_init_from_handle( | |
110 | struct lttng_directory_handle *new_handle, const char *path, | |
111 | const struct lttng_directory_handle *handle) | |
a42089bd JG |
112 | { |
113 | int ret; | |
114 | ||
115 | if (!path) { | |
d44a713b | 116 | ret = lttng_directory_handle_copy(handle, new_handle); |
a42089bd JG |
117 | goto end; |
118 | } | |
d44a713b JG |
119 | if (!*path) { |
120 | ERR("Failed to initialize directory handle: provided path is an empty string"); | |
121 | ret = -1; | |
122 | goto end; | |
123 | } | |
124 | ret = openat(handle->dirfd, path, O_RDONLY | O_DIRECTORY | O_CLOEXEC); | |
a42089bd JG |
125 | if (ret == -1) { |
126 | PERROR("Failed to initialize directory handle to \"%s\"", path); | |
127 | goto end; | |
128 | } | |
d44a713b | 129 | new_handle->dirfd = ret; |
a42089bd JG |
130 | ret = 0; |
131 | end: | |
132 | return ret; | |
133 | } | |
134 | ||
135 | LTTNG_HIDDEN | |
136 | int lttng_directory_handle_init_from_dirfd( | |
137 | struct lttng_directory_handle *handle, int dirfd) | |
138 | { | |
139 | handle->dirfd = dirfd; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | LTTNG_HIDDEN | |
144 | void lttng_directory_handle_fini(struct lttng_directory_handle *handle) | |
145 | { | |
146 | int ret; | |
147 | ||
a0c5463e JG |
148 | if (handle->dirfd == AT_FDCWD || handle->dirfd == -1) { |
149 | goto end; | |
a42089bd JG |
150 | } |
151 | ret = close(handle->dirfd); | |
152 | if (ret == -1) { | |
153 | PERROR("Failed to close directory file descriptor of directory handle"); | |
84a93c08 | 154 | abort(); |
a42089bd | 155 | } |
a0c5463e JG |
156 | end: |
157 | lttng_directory_handle_invalidate(handle); | |
a42089bd JG |
158 | } |
159 | ||
1197e651 JG |
160 | LTTNG_HIDDEN |
161 | int lttng_directory_handle_copy(const struct lttng_directory_handle *handle, | |
162 | struct lttng_directory_handle *new_copy) | |
163 | { | |
164 | int ret = 0; | |
165 | ||
166 | if (handle->dirfd == AT_FDCWD) { | |
167 | new_copy->dirfd = handle->dirfd; | |
168 | } else { | |
169 | new_copy->dirfd = dup(handle->dirfd); | |
170 | if (new_copy->dirfd == -1) { | |
171 | PERROR("Failed to duplicate directory fd of directory handle"); | |
172 | ret = -1; | |
173 | } | |
174 | } | |
175 | return ret; | |
176 | } | |
177 | ||
a0c5463e JG |
178 | static |
179 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) | |
180 | { | |
181 | handle->dirfd = -1; | |
182 | } | |
183 | ||
a42089bd JG |
184 | static |
185 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, | |
186 | const char *path, struct stat *st) | |
187 | { | |
188 | return fstatat(handle->dirfd, path, st, 0); | |
189 | } | |
190 | ||
191 | static | |
192 | int lttng_directory_handle_mkdir( | |
193 | const struct lttng_directory_handle *handle, | |
194 | const char *path, mode_t mode) | |
195 | { | |
196 | return mkdirat(handle->dirfd, path, mode); | |
197 | } | |
198 | ||
199 | static | |
a4ee1b7e JG |
200 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
201 | const char *filename, int flags, mode_t mode) | |
202 | { | |
203 | return openat(handle->dirfd, filename, flags, mode); | |
204 | } | |
205 | ||
206 | static | |
207 | int _run_as_open(const struct lttng_directory_handle *handle, | |
208 | const char *filename, | |
209 | int flags, mode_t mode, uid_t uid, gid_t gid) | |
210 | { | |
211 | return run_as_openat(handle->dirfd, filename, flags, mode, uid, gid); | |
212 | } | |
213 | ||
214 | static | |
215 | int _run_as_unlink(const struct lttng_directory_handle *handle, | |
216 | const char *filename, uid_t uid, gid_t gid) | |
217 | { | |
218 | return run_as_unlinkat(handle->dirfd, filename, uid, gid); | |
219 | } | |
220 | ||
221 | static | |
222 | int lttng_directory_handle_unlink( | |
223 | const struct lttng_directory_handle *handle, | |
224 | const char *filename) | |
225 | { | |
226 | return unlinkat(handle->dirfd, filename, 0); | |
227 | } | |
228 | ||
229 | static | |
230 | int _run_as_mkdir(const struct lttng_directory_handle *handle, | |
231 | const char *path, mode_t mode, uid_t uid, gid_t gid) | |
a42089bd JG |
232 | { |
233 | return run_as_mkdirat(handle->dirfd, path, mode, uid, gid); | |
234 | } | |
235 | ||
236 | static | |
237 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, | |
238 | const char *path, mode_t mode, uid_t uid, gid_t gid) | |
239 | { | |
240 | return run_as_mkdirat_recursive(handle->dirfd, path, mode, uid, gid); | |
241 | } | |
242 | ||
fcde531a JG |
243 | static |
244 | int _lttng_directory_handle_rename( | |
245 | const struct lttng_directory_handle *old_handle, | |
246 | const char *old_name, | |
247 | const struct lttng_directory_handle *new_handle, | |
248 | const char *new_name) | |
249 | { | |
250 | return renameat(old_handle->dirfd, old_name, | |
251 | new_handle->dirfd, new_name); | |
252 | } | |
253 | ||
254 | static | |
255 | int _run_as_rename(const struct lttng_directory_handle *old_handle, | |
256 | const char *old_name, | |
257 | const struct lttng_directory_handle *new_handle, | |
258 | const char *new_name, uid_t uid, gid_t gid) | |
259 | { | |
260 | return run_as_renameat(old_handle->dirfd, old_name, new_handle->dirfd, | |
261 | new_name, uid, gid); | |
262 | } | |
263 | ||
264 | static | |
265 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, | |
266 | const char *path) | |
267 | { | |
268 | DIR *dir_stream = NULL; | |
269 | int fd = openat(handle->dirfd, path, O_RDONLY); | |
270 | ||
271 | if (fd < 0) { | |
272 | goto end; | |
273 | } | |
274 | ||
275 | dir_stream = fdopendir(fd); | |
276 | if (!dir_stream) { | |
277 | int ret; | |
278 | ||
279 | PERROR("Failed to open directory stream"); | |
280 | ret = close(fd); | |
281 | if (ret) { | |
282 | PERROR("Failed to close file descriptor to %s", path); | |
283 | } | |
284 | goto end; | |
285 | } | |
286 | ||
287 | end: | |
288 | return dir_stream; | |
289 | } | |
290 | ||
291 | static | |
292 | int lttng_directory_handle_rmdir( | |
293 | const struct lttng_directory_handle *handle, const char *name) | |
294 | { | |
c7389bae FD |
295 | int ret = unlinkat(handle->dirfd, name, AT_REMOVEDIR); |
296 | if (ret) { | |
297 | PERROR("Failed to remove directory `%s`", name); | |
298 | } | |
299 | ||
300 | return ret; | |
fcde531a JG |
301 | } |
302 | ||
303 | static | |
304 | int _run_as_rmdir(const struct lttng_directory_handle *handle, | |
305 | const char *name, uid_t uid, gid_t gid) | |
306 | { | |
307 | return run_as_rmdirat(handle->dirfd, name, uid, gid); | |
308 | } | |
309 | ||
310 | static | |
311 | int _run_as_rmdir_recursive( | |
312 | const struct lttng_directory_handle *handle, const char *name, | |
58ec7253 | 313 | uid_t uid, gid_t gid, int flags) |
fcde531a | 314 | { |
58ec7253 | 315 | return run_as_rmdirat_recursive(handle->dirfd, name, uid, gid, flags); |
fcde531a JG |
316 | } |
317 | ||
a42089bd JG |
318 | #else /* COMPAT_DIRFD */ |
319 | ||
d44a713b JG |
320 | static |
321 | int get_full_path(const struct lttng_directory_handle *handle, | |
322 | const char *subdirectory, char *fullpath, size_t size) | |
323 | { | |
324 | int ret; | |
fcde531a JG |
325 | const bool subdirectory_is_absolute = |
326 | subdirectory && *subdirectory == '/'; | |
327 | const char * const base = subdirectory_is_absolute ? | |
328 | subdirectory : handle->base_path; | |
329 | const char * const end = subdirectory && !subdirectory_is_absolute ? | |
330 | subdirectory : NULL; | |
331 | const size_t base_len = strlen(base); | |
332 | const size_t end_len = end ? strlen(end) : 0; | |
333 | const bool add_separator_slash = end && base[base_len - 1] != '/'; | |
334 | const bool add_trailing_slash = end && end[end_len - 1] != '/'; | |
335 | ||
336 | ret = snprintf(fullpath, size, "%s%s%s%s", | |
337 | base, | |
338 | add_separator_slash ? "/" : "", | |
339 | end ? end : "", | |
340 | add_trailing_slash ? "/" : ""); | |
d44a713b JG |
341 | if (ret == -1 || ret >= size) { |
342 | ERR("Failed to format subdirectory from directory handle"); | |
343 | ret = -1; | |
fcde531a | 344 | goto end; |
d44a713b JG |
345 | } |
346 | ret = 0; | |
fcde531a | 347 | end: |
d44a713b JG |
348 | return ret; |
349 | } | |
350 | ||
a42089bd JG |
351 | LTTNG_HIDDEN |
352 | int lttng_directory_handle_init(struct lttng_directory_handle *handle, | |
353 | const char *path) | |
354 | { | |
355 | int ret; | |
fcde531a | 356 | const char *cwd = ""; |
d44a713b JG |
357 | size_t cwd_len, path_len; |
358 | char cwd_buf[LTTNG_PATH_MAX] = {}; | |
359 | char handle_buf[LTTNG_PATH_MAX] = {}; | |
fcde531a | 360 | bool add_cwd_slash = false, add_trailing_slash = false; |
d44a713b JG |
361 | const struct lttng_directory_handle cwd_handle = { |
362 | .base_path = handle_buf, | |
363 | }; | |
364 | ||
d44a713b | 365 | path_len = path ? strlen(path) : 0; |
d44a713b | 366 | add_trailing_slash = path && path[path_len - 1] != '/'; |
fcde531a JG |
367 | if (!path || (path && *path != '/')) { |
368 | cwd = getcwd(cwd_buf, sizeof(cwd_buf)); | |
369 | if (!cwd) { | |
370 | PERROR("Failed to initialize directory handle, can't get current working directory"); | |
371 | ret = -1; | |
372 | goto end; | |
373 | } | |
374 | cwd_len = strlen(cwd); | |
375 | if (cwd_len == 0) { | |
376 | ERR("Failed to initialize directory handle, current working directory path has a length of 0"); | |
377 | ret = -1; | |
378 | goto end; | |
379 | } | |
380 | add_cwd_slash = cwd[cwd_len - 1] != '/'; | |
381 | } | |
d44a713b JG |
382 | |
383 | ret = snprintf(handle_buf, sizeof(handle_buf), "%s%s%s%s", | |
384 | cwd, | |
385 | add_cwd_slash ? "/" : "", | |
386 | path ? : "", | |
387 | add_trailing_slash ? "/" : ""); | |
388 | if (ret == -1 || ret >= LTTNG_PATH_MAX) { | |
389 | ERR("Failed to initialize directory handle, failed to format directory path"); | |
390 | goto end; | |
a42089bd | 391 | } |
fcde531a | 392 | |
d44a713b JG |
393 | ret = lttng_directory_handle_init_from_handle(handle, path, |
394 | &cwd_handle); | |
395 | end: | |
396 | return ret; | |
397 | } | |
a42089bd | 398 | |
d44a713b JG |
399 | LTTNG_HIDDEN |
400 | int lttng_directory_handle_init_from_handle( | |
401 | struct lttng_directory_handle *new_handle, const char *path, | |
402 | const struct lttng_directory_handle *handle) | |
403 | { | |
404 | int ret; | |
405 | size_t path_len, handle_path_len; | |
406 | bool add_trailing_slash; | |
407 | struct stat stat_buf; | |
a42089bd | 408 | |
d44a713b JG |
409 | assert(handle && handle->base_path); |
410 | ||
411 | ret = lttng_directory_handle_stat(handle, path, &stat_buf); | |
412 | if (ret == -1) { | |
413 | PERROR("Failed to create directory handle"); | |
414 | goto end; | |
415 | } else if (!S_ISDIR(stat_buf.st_mode)) { | |
416 | char full_path[LTTNG_PATH_MAX]; | |
417 | ||
418 | /* Best effort for logging purposes. */ | |
419 | ret = get_full_path(handle, path, full_path, | |
420 | sizeof(full_path)); | |
421 | if (ret) { | |
422 | full_path[0] = '\0'; | |
a42089bd | 423 | } |
d44a713b JG |
424 | |
425 | ERR("Failed to initialize directory handle to \"%s\": not a directory", | |
426 | full_path); | |
427 | ret = -1; | |
428 | goto end; | |
429 | } | |
430 | if (!path) { | |
431 | ret = lttng_directory_handle_copy(handle, new_handle); | |
432 | goto end; | |
433 | } | |
434 | ||
435 | path_len = strlen(path); | |
436 | if (path_len == 0) { | |
437 | ERR("Failed to initialize directory handle: provided path is an empty string"); | |
438 | ret = -1; | |
439 | goto end; | |
440 | } | |
441 | if (*path == '/') { | |
442 | new_handle->base_path = strdup(path); | |
443 | ret = new_handle->base_path ? 0 : -1; | |
444 | goto end; | |
a42089bd JG |
445 | } |
446 | ||
d44a713b JG |
447 | add_trailing_slash = path[path_len - 1] != '/'; |
448 | ||
449 | handle_path_len = strlen(handle->base_path) + path_len + | |
450 | !!add_trailing_slash; | |
a42089bd JG |
451 | if (handle_path_len >= LTTNG_PATH_MAX) { |
452 | ERR("Failed to initialize directory handle as the resulting path's length (%zu bytes) exceeds the maximal allowed length (%d bytes)", | |
453 | handle_path_len, LTTNG_PATH_MAX); | |
454 | ret = -1; | |
455 | goto end; | |
456 | } | |
d44a713b JG |
457 | new_handle->base_path = zmalloc(handle_path_len); |
458 | if (!new_handle->base_path) { | |
a42089bd JG |
459 | PERROR("Failed to initialize directory handle"); |
460 | ret = -1; | |
461 | goto end; | |
462 | } | |
463 | ||
d44a713b JG |
464 | ret = sprintf(new_handle->base_path, "%s%s%s", |
465 | handle->base_path, | |
466 | path, | |
467 | add_trailing_slash ? "/" : ""); | |
a42089bd JG |
468 | if (ret == -1 || ret >= handle_path_len) { |
469 | ERR("Failed to initialize directory handle: path formatting failed"); | |
470 | ret = -1; | |
471 | goto end; | |
472 | } | |
473 | end: | |
474 | return ret; | |
475 | } | |
476 | ||
477 | LTTNG_HIDDEN | |
478 | int lttng_directory_handle_init_from_dirfd( | |
479 | struct lttng_directory_handle *handle, int dirfd) | |
480 | { | |
481 | assert(dirfd == AT_FDCWD); | |
482 | return lttng_directory_handle_init(handle, NULL); | |
483 | } | |
484 | ||
485 | LTTNG_HIDDEN | |
486 | void lttng_directory_handle_fini(struct lttng_directory_handle *handle) | |
487 | { | |
488 | free(handle->base_path); | |
a0c5463e | 489 | lttng_directory_handle_invalidate(handle); |
a42089bd JG |
490 | } |
491 | ||
1197e651 JG |
492 | LTTNG_HIDDEN |
493 | int lttng_directory_handle_copy(const struct lttng_directory_handle *handle, | |
494 | struct lttng_directory_handle *new_copy) | |
495 | { | |
496 | new_copy->base_path = strdup(handle->base_path); | |
497 | return new_copy->base_path ? 0 : -1; | |
498 | } | |
499 | ||
a0c5463e JG |
500 | static |
501 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) | |
502 | { | |
503 | handle->base_path = NULL; | |
504 | } | |
505 | ||
a42089bd JG |
506 | static |
507 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, | |
508 | const char *subdirectory, struct stat *st) | |
509 | { | |
510 | int ret; | |
511 | char fullpath[LTTNG_PATH_MAX]; | |
512 | ||
513 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); | |
514 | if (ret) { | |
515 | errno = ENOMEM; | |
516 | goto end; | |
517 | } | |
518 | ||
519 | ret = stat(fullpath, st); | |
520 | end: | |
521 | return ret; | |
522 | } | |
523 | ||
524 | static | |
525 | int lttng_directory_handle_mkdir(const struct lttng_directory_handle *handle, | |
526 | const char *subdirectory, mode_t mode) | |
527 | { | |
528 | int ret; | |
529 | char fullpath[LTTNG_PATH_MAX]; | |
530 | ||
531 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); | |
532 | if (ret) { | |
533 | errno = ENOMEM; | |
534 | goto end; | |
535 | } | |
536 | ||
537 | ret = mkdir(fullpath, mode); | |
538 | end: | |
539 | return ret; | |
540 | } | |
541 | ||
a4ee1b7e JG |
542 | static |
543 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, | |
544 | const char *filename, int flags, mode_t mode) | |
545 | { | |
546 | int ret; | |
547 | char fullpath[LTTNG_PATH_MAX]; | |
548 | ||
549 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
550 | if (ret) { | |
551 | errno = ENOMEM; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | ret = open(fullpath, flags, mode); | |
556 | end: | |
557 | return ret; | |
558 | } | |
559 | ||
560 | static | |
561 | int lttng_directory_handle_unlink( | |
562 | const struct lttng_directory_handle *handle, | |
563 | const char *filename) | |
564 | { | |
565 | int ret; | |
566 | char fullpath[LTTNG_PATH_MAX]; | |
567 | ||
568 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
569 | if (ret) { | |
570 | errno = ENOMEM; | |
571 | goto end; | |
572 | } | |
573 | ||
574 | ret = unlink(fullpath); | |
575 | end: | |
576 | return ret; | |
577 | } | |
578 | ||
a42089bd JG |
579 | static |
580 | int _run_as_mkdir(const struct lttng_directory_handle *handle, const char *path, | |
581 | mode_t mode, uid_t uid, gid_t gid) | |
582 | { | |
583 | int ret; | |
584 | char fullpath[LTTNG_PATH_MAX]; | |
585 | ||
586 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); | |
587 | if (ret) { | |
588 | errno = ENOMEM; | |
589 | goto end; | |
590 | } | |
591 | ||
592 | ret = run_as_mkdir(fullpath, mode, uid, gid); | |
593 | end: | |
594 | return ret; | |
595 | } | |
596 | ||
a4ee1b7e JG |
597 | static |
598 | int _run_as_open(const struct lttng_directory_handle *handle, | |
599 | const char *filename, | |
600 | int flags, mode_t mode, uid_t uid, gid_t gid) | |
601 | { | |
602 | int ret; | |
603 | char fullpath[LTTNG_PATH_MAX]; | |
604 | ||
605 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
606 | if (ret) { | |
607 | errno = ENOMEM; | |
608 | goto end; | |
609 | } | |
610 | ||
611 | ret = run_as_open(fullpath, flags, mode, uid, gid); | |
612 | end: | |
613 | return ret; | |
614 | } | |
615 | ||
616 | static | |
617 | int _run_as_unlink(const struct lttng_directory_handle *handle, | |
618 | const char *filename, uid_t uid, gid_t gid) | |
619 | { | |
620 | int ret; | |
621 | char fullpath[LTTNG_PATH_MAX]; | |
622 | ||
623 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
624 | if (ret) { | |
625 | errno = ENOMEM; | |
626 | goto end; | |
627 | } | |
628 | ||
629 | ret = run_as_unlink(fullpath, uid, gid); | |
630 | end: | |
631 | return ret; | |
632 | } | |
633 | ||
a42089bd JG |
634 | static |
635 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, | |
636 | const char *path, mode_t mode, uid_t uid, gid_t gid) | |
637 | { | |
638 | int ret; | |
639 | char fullpath[LTTNG_PATH_MAX]; | |
640 | ||
641 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); | |
642 | if (ret) { | |
643 | errno = ENOMEM; | |
644 | goto end; | |
645 | } | |
646 | ||
647 | ret = run_as_mkdir_recursive(fullpath, mode, uid, gid); | |
648 | end: | |
649 | return ret; | |
650 | } | |
651 | ||
fcde531a JG |
652 | static |
653 | int _lttng_directory_handle_rename( | |
654 | const struct lttng_directory_handle *old_handle, | |
655 | const char *old_name, | |
656 | const struct lttng_directory_handle *new_handle, | |
657 | const char *new_name) | |
658 | { | |
659 | int ret; | |
660 | char old_fullpath[LTTNG_PATH_MAX]; | |
661 | char new_fullpath[LTTNG_PATH_MAX]; | |
662 | ||
663 | ret = get_full_path(old_handle, old_name, old_fullpath, | |
664 | sizeof(old_fullpath)); | |
665 | if (ret) { | |
666 | errno = ENOMEM; | |
667 | goto end; | |
668 | } | |
669 | ret = get_full_path(new_handle, new_name, new_fullpath, | |
670 | sizeof(new_fullpath)); | |
671 | if (ret) { | |
672 | errno = ENOMEM; | |
673 | goto end; | |
674 | } | |
675 | ||
676 | ret = rename(old_fullpath, new_fullpath); | |
677 | end: | |
678 | return ret; | |
679 | } | |
680 | ||
681 | static | |
682 | int _run_as_rename(const struct lttng_directory_handle *old_handle, | |
683 | const char *old_name, | |
684 | const struct lttng_directory_handle *new_handle, | |
685 | const char *new_name, uid_t uid, gid_t gid) | |
686 | { | |
687 | int ret; | |
688 | char old_fullpath[LTTNG_PATH_MAX]; | |
689 | char new_fullpath[LTTNG_PATH_MAX]; | |
690 | ||
691 | ret = get_full_path(old_handle, old_name, old_fullpath, | |
692 | sizeof(old_fullpath)); | |
693 | if (ret) { | |
694 | errno = ENOMEM; | |
695 | goto end; | |
696 | } | |
697 | ret = get_full_path(new_handle, new_name, new_fullpath, | |
698 | sizeof(new_fullpath)); | |
699 | if (ret) { | |
700 | errno = ENOMEM; | |
701 | goto end; | |
702 | } | |
703 | ||
704 | ret = run_as_rename(old_fullpath, new_fullpath, uid, gid); | |
705 | end: | |
706 | return ret; | |
707 | } | |
708 | ||
709 | static | |
710 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, | |
711 | const char *path) | |
712 | { | |
713 | int ret; | |
714 | DIR *dir_stream = NULL; | |
715 | char fullpath[LTTNG_PATH_MAX]; | |
716 | ||
717 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); | |
718 | if (ret) { | |
719 | errno = ENOMEM; | |
720 | goto end; | |
721 | } | |
722 | ||
723 | dir_stream = opendir(fullpath); | |
724 | end: | |
725 | return dir_stream; | |
726 | } | |
727 | ||
728 | static | |
729 | int lttng_directory_handle_rmdir( | |
730 | const struct lttng_directory_handle *handle, const char *name) | |
731 | { | |
732 | int ret; | |
733 | char fullpath[LTTNG_PATH_MAX]; | |
734 | ||
735 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); | |
736 | if (ret) { | |
737 | errno = ENOMEM; | |
738 | goto end; | |
739 | } | |
740 | ||
741 | ret = rmdir(fullpath); | |
742 | end: | |
743 | return ret; | |
744 | } | |
745 | ||
746 | static | |
747 | int _run_as_rmdir(const struct lttng_directory_handle *handle, | |
748 | const char *name, uid_t uid, gid_t gid) | |
749 | { | |
750 | int ret; | |
751 | char fullpath[LTTNG_PATH_MAX]; | |
752 | ||
753 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); | |
754 | if (ret) { | |
755 | errno = ENOMEM; | |
756 | goto end; | |
757 | } | |
758 | ||
759 | ret = run_as_rmdir(fullpath, uid, gid); | |
760 | end: | |
761 | return ret; | |
762 | } | |
763 | ||
764 | static | |
765 | int _run_as_rmdir_recursive( | |
766 | const struct lttng_directory_handle *handle, const char *name, | |
58ec7253 | 767 | uid_t uid, gid_t gid, int flags) |
fcde531a JG |
768 | { |
769 | int ret; | |
770 | char fullpath[LTTNG_PATH_MAX]; | |
771 | ||
772 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); | |
773 | if (ret) { | |
774 | errno = ENOMEM; | |
775 | goto end; | |
776 | } | |
777 | ||
58ec7253 | 778 | ret = run_as_rmdir_recursive(fullpath, uid, gid, flags); |
fcde531a JG |
779 | end: |
780 | return ret; | |
781 | } | |
782 | ||
a42089bd JG |
783 | #endif /* COMPAT_DIRFD */ |
784 | ||
fcde531a JG |
785 | /* Common implementation. */ |
786 | ||
a42089bd JG |
787 | /* |
788 | * On some filesystems (e.g. nfs), mkdir will validate access rights before | |
789 | * checking for the existence of the path element. This means that on a setup | |
790 | * where "/home/" is a mounted NFS share, and running as an unpriviledged user, | |
791 | * recursively creating a path of the form "/home/my_user/trace/" will fail with | |
792 | * EACCES on mkdir("/home", ...). | |
793 | * | |
794 | * Checking the path for existence allows us to work around this behaviour. | |
795 | */ | |
796 | static | |
797 | int create_directory_check_exists(const struct lttng_directory_handle *handle, | |
798 | const char *path, mode_t mode) | |
799 | { | |
800 | int ret = 0; | |
801 | struct stat st; | |
802 | ||
803 | ret = lttng_directory_handle_stat(handle, path, &st); | |
804 | if (ret == 0) { | |
805 | if (S_ISDIR(st.st_mode)) { | |
806 | /* Directory exists, skip. */ | |
807 | goto end; | |
808 | } else { | |
809 | /* Exists, but is not a directory. */ | |
810 | errno = ENOTDIR; | |
811 | ret = -1; | |
812 | goto end; | |
813 | } | |
fcde531a JG |
814 | } else if (errno != ENOENT) { |
815 | goto end; | |
a42089bd JG |
816 | } |
817 | ||
818 | /* | |
819 | * Let mkdir handle other errors as the caller expects mkdir | |
820 | * semantics. | |
821 | */ | |
822 | ret = lttng_directory_handle_mkdir(handle, path, mode); | |
823 | end: | |
824 | return ret; | |
825 | } | |
826 | ||
a0c5463e JG |
827 | LTTNG_HIDDEN |
828 | struct lttng_directory_handle | |
829 | lttng_directory_handle_move(struct lttng_directory_handle *original) | |
830 | { | |
831 | const struct lttng_directory_handle tmp = *original; | |
832 | ||
833 | lttng_directory_handle_invalidate(original); | |
834 | return tmp; | |
835 | } | |
836 | ||
a42089bd JG |
837 | static |
838 | int create_directory_recursive(const struct lttng_directory_handle *handle, | |
839 | const char *path, mode_t mode) | |
840 | { | |
841 | char *p, tmp[LTTNG_PATH_MAX]; | |
842 | size_t len; | |
843 | int ret; | |
844 | ||
845 | assert(path); | |
846 | ||
847 | ret = lttng_strncpy(tmp, path, sizeof(tmp)); | |
848 | if (ret) { | |
849 | ERR("Failed to create directory: provided path's length (%zu bytes) exceeds the maximal allowed length (%zu bytes)", | |
850 | strlen(path) + 1, sizeof(tmp)); | |
851 | goto error; | |
852 | } | |
853 | ||
854 | len = strlen(path); | |
855 | if (tmp[len - 1] == '/') { | |
856 | tmp[len - 1] = 0; | |
857 | } | |
858 | ||
859 | for (p = tmp + 1; *p; p++) { | |
860 | if (*p == '/') { | |
861 | *p = 0; | |
862 | if (tmp[strlen(tmp) - 1] == '.' && | |
863 | tmp[strlen(tmp) - 2] == '.' && | |
864 | tmp[strlen(tmp) - 3] == '/') { | |
865 | ERR("Using '/../' is not permitted in the trace path (%s)", | |
866 | tmp); | |
867 | ret = -1; | |
868 | goto error; | |
869 | } | |
870 | ret = create_directory_check_exists(handle, tmp, mode); | |
871 | if (ret < 0) { | |
872 | if (errno != EACCES) { | |
873 | PERROR("Failed to create directory \"%s\"", | |
874 | path); | |
875 | ret = -errno; | |
876 | goto error; | |
877 | } | |
878 | } | |
879 | *p = '/'; | |
880 | } | |
881 | } | |
882 | ||
883 | ret = create_directory_check_exists(handle, tmp, mode); | |
884 | if (ret < 0) { | |
885 | PERROR("mkdirat recursive last element"); | |
886 | ret = -errno; | |
887 | } | |
888 | error: | |
889 | return ret; | |
890 | } | |
891 | ||
892 | LTTNG_HIDDEN | |
893 | int lttng_directory_handle_create_subdirectory_as_user( | |
894 | const struct lttng_directory_handle *handle, | |
895 | const char *subdirectory, | |
6992f9f1 | 896 | mode_t mode, const struct lttng_credentials *creds) |
a42089bd JG |
897 | { |
898 | int ret; | |
899 | ||
900 | if (!creds) { | |
901 | /* Run as current user. */ | |
902 | ret = create_directory_check_exists(handle, | |
903 | subdirectory, mode); | |
904 | } else { | |
905 | ret = _run_as_mkdir(handle, subdirectory, | |
906 | mode, creds->uid, creds->gid); | |
907 | } | |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
912 | LTTNG_HIDDEN | |
913 | int lttng_directory_handle_create_subdirectory_recursive_as_user( | |
914 | const struct lttng_directory_handle *handle, | |
915 | const char *subdirectory_path, | |
6992f9f1 | 916 | mode_t mode, const struct lttng_credentials *creds) |
a42089bd JG |
917 | { |
918 | int ret; | |
919 | ||
920 | if (!creds) { | |
921 | /* Run as current user. */ | |
922 | ret = create_directory_recursive(handle, | |
923 | subdirectory_path, mode); | |
924 | } else { | |
925 | ret = _run_as_mkdir_recursive(handle, subdirectory_path, | |
926 | mode, creds->uid, creds->gid); | |
927 | } | |
928 | ||
929 | return ret; | |
930 | } | |
931 | ||
932 | LTTNG_HIDDEN | |
933 | int lttng_directory_handle_create_subdirectory( | |
934 | const struct lttng_directory_handle *handle, | |
935 | const char *subdirectory, | |
936 | mode_t mode) | |
937 | { | |
938 | return lttng_directory_handle_create_subdirectory_as_user( | |
939 | handle, subdirectory, mode, NULL); | |
940 | } | |
941 | ||
942 | LTTNG_HIDDEN | |
943 | int lttng_directory_handle_create_subdirectory_recursive( | |
944 | const struct lttng_directory_handle *handle, | |
945 | const char *subdirectory_path, | |
946 | mode_t mode) | |
947 | { | |
948 | return lttng_directory_handle_create_subdirectory_recursive_as_user( | |
949 | handle, subdirectory_path, mode, NULL); | |
950 | } | |
a4ee1b7e JG |
951 | |
952 | LTTNG_HIDDEN | |
953 | int lttng_directory_handle_open_file_as_user( | |
954 | const struct lttng_directory_handle *handle, | |
955 | const char *filename, | |
956 | int flags, mode_t mode, | |
957 | const struct lttng_credentials *creds) | |
958 | { | |
959 | int ret; | |
960 | ||
961 | if (!creds) { | |
962 | /* Run as current user. */ | |
963 | ret = lttng_directory_handle_open(handle, filename, flags, | |
964 | mode); | |
965 | } else { | |
966 | ret = _run_as_open(handle, filename, flags, mode, | |
967 | creds->uid, creds->gid); | |
968 | } | |
969 | return ret; | |
970 | } | |
971 | ||
972 | LTTNG_HIDDEN | |
973 | int lttng_directory_handle_open_file( | |
974 | const struct lttng_directory_handle *handle, | |
975 | const char *filename, | |
976 | int flags, mode_t mode) | |
977 | { | |
978 | return lttng_directory_handle_open_file_as_user(handle, filename, flags, | |
979 | mode, NULL); | |
980 | } | |
981 | ||
982 | LTTNG_HIDDEN | |
983 | int lttng_directory_handle_unlink_file_as_user( | |
984 | const struct lttng_directory_handle *handle, | |
985 | const char *filename, | |
986 | const struct lttng_credentials *creds) | |
987 | { | |
988 | int ret; | |
989 | ||
990 | if (!creds) { | |
991 | /* Run as current user. */ | |
992 | ret = lttng_directory_handle_unlink(handle, filename); | |
993 | } else { | |
994 | ret = _run_as_unlink(handle, filename, creds->uid, creds->gid); | |
995 | } | |
996 | return ret; | |
997 | } | |
998 | ||
999 | LTTNG_HIDDEN | |
1000 | int lttng_directory_handle_unlink_file( | |
1001 | const struct lttng_directory_handle *handle, | |
1002 | const char *filename) | |
1003 | { | |
1004 | return lttng_directory_handle_unlink_file_as_user(handle, | |
1005 | filename, NULL); | |
1006 | } | |
fcde531a JG |
1007 | |
1008 | LTTNG_HIDDEN | |
1009 | int lttng_directory_handle_rename( | |
1010 | const struct lttng_directory_handle *old_handle, | |
1011 | const char *old_name, | |
1012 | const struct lttng_directory_handle *new_handle, | |
1013 | const char *new_name) | |
1014 | { | |
1015 | return lttng_directory_handle_rename_as_user(old_handle, old_name, | |
1016 | new_handle, new_name, NULL); | |
1017 | } | |
1018 | ||
1019 | LTTNG_HIDDEN | |
1020 | int lttng_directory_handle_rename_as_user( | |
1021 | const struct lttng_directory_handle *old_handle, | |
1022 | const char *old_name, | |
1023 | const struct lttng_directory_handle *new_handle, | |
1024 | const char *new_name, | |
1025 | const struct lttng_credentials *creds) | |
1026 | { | |
1027 | int ret; | |
1028 | ||
1029 | if (!creds) { | |
1030 | /* Run as current user. */ | |
1031 | ret = _lttng_directory_handle_rename(old_handle, | |
1032 | old_name, new_handle, new_name); | |
1033 | } else { | |
1034 | ret = _run_as_rename(old_handle, old_name, new_handle, | |
1035 | new_name, creds->uid, creds->gid); | |
1036 | } | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | LTTNG_HIDDEN | |
1041 | int lttng_directory_handle_remove_subdirectory( | |
1042 | const struct lttng_directory_handle *handle, | |
1043 | const char *name) | |
1044 | { | |
1045 | return lttng_directory_handle_remove_subdirectory_as_user(handle, name, | |
1046 | NULL); | |
1047 | } | |
1048 | ||
1049 | LTTNG_HIDDEN | |
1050 | int lttng_directory_handle_remove_subdirectory_as_user( | |
1051 | const struct lttng_directory_handle *handle, | |
1052 | const char *name, | |
1053 | const struct lttng_credentials *creds) | |
1054 | { | |
1055 | int ret; | |
1056 | ||
1057 | if (!creds) { | |
1058 | /* Run as current user. */ | |
1059 | ret = lttng_directory_handle_rmdir(handle, name); | |
1060 | } else { | |
1061 | ret = _run_as_rmdir(handle, name, creds->uid, creds->gid); | |
1062 | } | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | struct rmdir_frame { | |
58ec7253 | 1067 | ssize_t parent_frame_idx; |
fcde531a | 1068 | DIR *dir; |
58ec7253 | 1069 | bool empty; |
fcde531a JG |
1070 | /* Size including '\0'. */ |
1071 | size_t path_size; | |
1072 | }; | |
1073 | ||
1074 | static | |
1075 | void rmdir_frame_fini(void *data) | |
1076 | { | |
e0d70799 | 1077 | int ret; |
fcde531a JG |
1078 | struct rmdir_frame *frame = data; |
1079 | ||
e0d70799 FD |
1080 | ret = closedir(frame->dir); |
1081 | if (ret == -1) { | |
1082 | PERROR("Failed to close directory stream"); | |
1083 | } | |
fcde531a JG |
1084 | } |
1085 | ||
1086 | static | |
1087 | int remove_directory_recursive(const struct lttng_directory_handle *handle, | |
58ec7253 | 1088 | const char *path, int flags) |
fcde531a JG |
1089 | { |
1090 | int ret; | |
1091 | struct lttng_dynamic_array frames; | |
1092 | size_t current_frame_idx = 0; | |
1093 | struct rmdir_frame initial_frame = { | |
58ec7253 | 1094 | .parent_frame_idx = -1, |
fcde531a | 1095 | .dir = lttng_directory_handle_opendir(handle, path), |
58ec7253 | 1096 | .empty = true, |
fcde531a JG |
1097 | .path_size = strlen(path) + 1, |
1098 | }; | |
1099 | struct lttng_dynamic_buffer current_path; | |
1100 | const char separator = '/'; | |
1101 | ||
1102 | lttng_dynamic_buffer_init(¤t_path); | |
1103 | lttng_dynamic_array_init(&frames, sizeof(struct rmdir_frame), | |
58ec7253 MD |
1104 | rmdir_frame_fini); |
1105 | ||
1106 | if (flags & ~(LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG | | |
1107 | LTTNG_DIRECTORY_HANDLE_FAIL_NON_EMPTY_FLAG)) { | |
1108 | ERR("Unknown flags %d", flags); | |
1109 | ret = -1; | |
1110 | goto end; | |
1111 | } | |
1112 | ||
1113 | if (!initial_frame.dir) { | |
1114 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG && | |
1115 | errno == ENOENT) { | |
1116 | DBG("Cannot rmdir \"%s\": root does not exist", path); | |
1117 | ret = 0; | |
1118 | goto end; | |
1119 | } else { | |
1120 | PERROR("Failed to rmdir \"%s\"", path); | |
1121 | ret = -1; | |
1122 | goto end; | |
1123 | } | |
1124 | } | |
fcde531a JG |
1125 | |
1126 | ret = lttng_dynamic_array_add_element(&frames, &initial_frame); | |
1127 | if (ret) { | |
1128 | ERR("Failed to push context frame during recursive directory removal"); | |
1129 | rmdir_frame_fini(&initial_frame); | |
1130 | goto end; | |
1131 | } | |
1132 | ||
58ec7253 MD |
1133 | ret = lttng_dynamic_buffer_append( |
1134 | ¤t_path, path, initial_frame.path_size); | |
1135 | if (ret) { | |
fcde531a JG |
1136 | ERR("Failed to set initial path during recursive directory removal"); |
1137 | ret = -1; | |
1138 | goto end; | |
58ec7253 | 1139 | } |
fcde531a | 1140 | |
58ec7253 | 1141 | while (lttng_dynamic_array_get_count(&frames) > 0) { |
fcde531a JG |
1142 | struct dirent *entry; |
1143 | struct rmdir_frame *current_frame = | |
58ec7253 MD |
1144 | lttng_dynamic_array_get_element( |
1145 | &frames, current_frame_idx); | |
fcde531a | 1146 | |
58ec7253 MD |
1147 | assert(current_frame->dir); |
1148 | ret = lttng_dynamic_buffer_set_size( | |
1149 | ¤t_path, current_frame->path_size); | |
fcde531a JG |
1150 | assert(!ret); |
1151 | current_path.data[current_path.size - 1] = '\0'; | |
1152 | ||
1153 | while ((entry = readdir(current_frame->dir))) { | |
1154 | struct stat st; | |
fcde531a | 1155 | |
58ec7253 MD |
1156 | if (!strcmp(entry->d_name, ".") || |
1157 | !strcmp(entry->d_name, "..")) { | |
fcde531a JG |
1158 | continue; |
1159 | } | |
1160 | ||
1161 | /* Set current_path to the entry's path. */ | |
58ec7253 MD |
1162 | ret = lttng_dynamic_buffer_set_size( |
1163 | ¤t_path, current_path.size - 1); | |
fcde531a JG |
1164 | assert(!ret); |
1165 | ret = lttng_dynamic_buffer_append(¤t_path, | |
1166 | &separator, sizeof(separator)); | |
1167 | if (ret) { | |
1168 | goto end; | |
1169 | } | |
1170 | ret = lttng_dynamic_buffer_append(¤t_path, | |
1171 | entry->d_name, | |
1172 | strlen(entry->d_name) + 1); | |
1173 | if (ret) { | |
1174 | goto end; | |
1175 | } | |
1176 | ||
58ec7253 MD |
1177 | if (lttng_directory_handle_stat( |
1178 | handle, current_path.data, &st)) { | |
1179 | if ((flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG) && | |
1180 | errno == ENOENT) { | |
1181 | break; | |
1182 | } | |
fcde531a JG |
1183 | PERROR("Failed to stat \"%s\"", |
1184 | current_path.data); | |
1185 | ret = -1; | |
1186 | goto end; | |
1187 | } | |
1188 | ||
1189 | if (!S_ISDIR(st.st_mode)) { | |
58ec7253 MD |
1190 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG) { |
1191 | current_frame->empty = false; | |
1192 | break; | |
1193 | } else { | |
1194 | /* Not empty, abort. */ | |
1195 | DBG("Directory \"%s\" is not empty; refusing to remove directory", | |
1196 | current_path.data); | |
1197 | ret = -1; | |
1198 | goto end; | |
1199 | } | |
1200 | } else { | |
1201 | struct rmdir_frame new_frame = { | |
1202 | .path_size = current_path.size, | |
1203 | .dir = lttng_directory_handle_opendir( | |
1204 | handle, | |
1205 | current_path.data), | |
1206 | .empty = true, | |
1207 | .parent_frame_idx = current_frame_idx, | |
1208 | }; | |
1209 | ||
1210 | if (!new_frame.dir) { | |
1211 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG && | |
1212 | errno == ENOENT) { | |
1213 | DBG("Non-existing directory stream during recursive directory removal"); | |
1214 | break; | |
1215 | } else { | |
1216 | PERROR("Failed to open directory stream during recursive directory removal"); | |
1217 | ret = -1; | |
1218 | goto end; | |
1219 | } | |
1220 | } | |
1221 | ret = lttng_dynamic_array_add_element( | |
1222 | &frames, &new_frame); | |
1223 | if (ret) { | |
1224 | ERR("Failed to push context frame during recursive directory removal"); | |
1225 | rmdir_frame_fini(&new_frame); | |
1226 | goto end; | |
1227 | } | |
1228 | current_frame_idx++; | |
1229 | /* We break iteration on readdir. */ | |
1230 | break; | |
fcde531a | 1231 | } |
58ec7253 MD |
1232 | } |
1233 | if (entry) { | |
1234 | continue; | |
1235 | } | |
fcde531a | 1236 | |
58ec7253 MD |
1237 | /* Pop rmdir frame. */ |
1238 | if (current_frame->empty) { | |
1239 | ret = lttng_directory_handle_rmdir( | |
1240 | handle, current_path.data); | |
fcde531a | 1241 | if (ret) { |
58ec7253 MD |
1242 | if ((flags & LTTNG_DIRECTORY_HANDLE_FAIL_NON_EMPTY_FLAG) || |
1243 | errno != ENOENT) { | |
1244 | PERROR("Failed to remove \"%s\" during recursive directory removal", | |
1245 | current_path.data); | |
1246 | goto end; | |
1247 | } | |
1248 | DBG("Non-existing directory stream during recursive directory removal"); | |
fcde531a | 1249 | } |
58ec7253 MD |
1250 | } else if (current_frame->parent_frame_idx >= 0) { |
1251 | struct rmdir_frame *parent_frame; | |
1252 | ||
1253 | parent_frame = lttng_dynamic_array_get_element(&frames, | |
1254 | current_frame->parent_frame_idx); | |
1255 | assert(parent_frame); | |
1256 | parent_frame->empty = false; | |
1257 | } | |
1258 | ret = lttng_dynamic_array_remove_element( | |
1259 | &frames, current_frame_idx); | |
1260 | if (ret) { | |
1261 | ERR("Failed to pop context frame during recursive directory removal"); | |
1262 | goto end; | |
1263 | } | |
1264 | current_frame_idx--; | |
fcde531a JG |
1265 | } |
1266 | end: | |
1267 | lttng_dynamic_array_reset(&frames); | |
1268 | lttng_dynamic_buffer_reset(¤t_path); | |
1269 | return ret; | |
1270 | } | |
1271 | ||
1272 | LTTNG_HIDDEN | |
1273 | int lttng_directory_handle_remove_subdirectory_recursive( | |
1274 | const struct lttng_directory_handle *handle, | |
58ec7253 MD |
1275 | const char *name, |
1276 | int flags) | |
fcde531a JG |
1277 | { |
1278 | return lttng_directory_handle_remove_subdirectory_recursive_as_user( | |
58ec7253 | 1279 | handle, name, NULL, flags); |
fcde531a JG |
1280 | } |
1281 | ||
1282 | LTTNG_HIDDEN | |
1283 | int lttng_directory_handle_remove_subdirectory_recursive_as_user( | |
1284 | const struct lttng_directory_handle *handle, | |
1285 | const char *name, | |
58ec7253 MD |
1286 | const struct lttng_credentials *creds, |
1287 | int flags) | |
fcde531a JG |
1288 | { |
1289 | int ret; | |
1290 | ||
1291 | if (!creds) { | |
1292 | /* Run as current user. */ | |
58ec7253 | 1293 | ret = remove_directory_recursive(handle, name, flags); |
fcde531a JG |
1294 | } else { |
1295 | ret = _run_as_rmdir_recursive(handle, name, creds->uid, | |
58ec7253 | 1296 | creds->gid, flags); |
fcde531a JG |
1297 | } |
1298 | return ret; | |
1299 | } |