Commit | Line | Data |
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18710679 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> | |
93bed9fe | 24 | #include <common/dynamic-array.h> |
18710679 JG |
25 | |
26 | #include <assert.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/stat.h> | |
29 | #include <fcntl.h> | |
30 | #include <unistd.h> | |
93bed9fe | 31 | #include <dirent.h> |
18710679 | 32 | |
2912cead 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 | */ | |
18710679 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); | |
46307ffe | 51 | static |
2912cead 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 | |
93bed9fe 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, | |
f75c5439 | 88 | uid_t uid, gid_t gid, int flags); |
93bed9fe | 89 | static |
46307ffe | 90 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle); |
cbf53d23 JG |
91 | static |
92 | void lttng_directory_handle_release(struct urcu_ref *ref); | |
18710679 JG |
93 | |
94 | #ifdef COMPAT_DIRFD | |
95 | ||
96 | LTTNG_HIDDEN | |
cbf53d23 | 97 | struct lttng_directory_handle *lttng_directory_handle_create(const char *path) |
fd774fc6 JG |
98 | { |
99 | const struct lttng_directory_handle cwd_handle = { | |
100 | .dirfd = AT_FDCWD, | |
101 | }; | |
102 | ||
103 | /* Open a handle to the CWD if NULL is passed. */ | |
cbf53d23 | 104 | return lttng_directory_handle_create_from_handle(path, &cwd_handle); |
fd774fc6 JG |
105 | } |
106 | ||
107 | LTTNG_HIDDEN | |
cbf53d23 JG |
108 | struct lttng_directory_handle *lttng_directory_handle_create_from_handle( |
109 | const char *path, | |
110 | const struct lttng_directory_handle *ref_handle) | |
18710679 | 111 | { |
cbf53d23 JG |
112 | int dirfd; |
113 | struct lttng_directory_handle *handle = NULL; | |
18710679 JG |
114 | |
115 | if (!path) { | |
cbf53d23 | 116 | handle = lttng_directory_handle_copy(ref_handle); |
18710679 JG |
117 | goto end; |
118 | } | |
fd774fc6 JG |
119 | if (!*path) { |
120 | ERR("Failed to initialize directory handle: provided path is an empty string"); | |
fd774fc6 JG |
121 | goto end; |
122 | } | |
cbf53d23 JG |
123 | |
124 | dirfd = openat(ref_handle->dirfd, path, O_RDONLY | O_DIRECTORY | O_CLOEXEC); | |
125 | if (dirfd == -1) { | |
18710679 JG |
126 | PERROR("Failed to initialize directory handle to \"%s\"", path); |
127 | goto end; | |
128 | } | |
cbf53d23 JG |
129 | |
130 | handle = lttng_directory_handle_create_from_dirfd(dirfd); | |
131 | if (!handle) { | |
132 | goto error_close; | |
133 | } | |
18710679 | 134 | end: |
cbf53d23 JG |
135 | return handle; |
136 | error_close: | |
137 | if (close(dirfd)) { | |
138 | PERROR("Failed to close directory file descriptor"); | |
139 | } | |
140 | return NULL; | |
18710679 JG |
141 | } |
142 | ||
143 | LTTNG_HIDDEN | |
cbf53d23 JG |
144 | struct lttng_directory_handle *lttng_directory_handle_create_from_dirfd( |
145 | int dirfd) | |
18710679 | 146 | { |
cbf53d23 JG |
147 | struct lttng_directory_handle *handle = zmalloc(sizeof(*handle)); |
148 | ||
149 | if (!handle) { | |
150 | goto end; | |
151 | } | |
18710679 | 152 | handle->dirfd = dirfd; |
cbf53d23 JG |
153 | urcu_ref_init(&handle->ref); |
154 | end: | |
155 | return handle; | |
18710679 JG |
156 | } |
157 | ||
cbf53d23 JG |
158 | static |
159 | void lttng_directory_handle_release(struct urcu_ref *ref) | |
18710679 JG |
160 | { |
161 | int ret; | |
cbf53d23 JG |
162 | struct lttng_directory_handle *handle = |
163 | container_of(ref, struct lttng_directory_handle, ref); | |
18710679 | 164 | |
46307ffe JG |
165 | if (handle->dirfd == AT_FDCWD || handle->dirfd == -1) { |
166 | goto end; | |
18710679 JG |
167 | } |
168 | ret = close(handle->dirfd); | |
169 | if (ret == -1) { | |
170 | PERROR("Failed to close directory file descriptor of directory handle"); | |
171 | } | |
46307ffe JG |
172 | end: |
173 | lttng_directory_handle_invalidate(handle); | |
cbf53d23 | 174 | free(handle); |
18710679 JG |
175 | } |
176 | ||
578e21bd | 177 | LTTNG_HIDDEN |
cbf53d23 JG |
178 | struct lttng_directory_handle *lttng_directory_handle_copy( |
179 | const struct lttng_directory_handle *handle) | |
578e21bd | 180 | { |
cbf53d23 | 181 | struct lttng_directory_handle *new_handle = NULL; |
578e21bd JG |
182 | |
183 | if (handle->dirfd == AT_FDCWD) { | |
cbf53d23 | 184 | new_handle = lttng_directory_handle_create_from_dirfd(AT_FDCWD); |
578e21bd | 185 | } else { |
cbf53d23 JG |
186 | const int new_dirfd = dup(handle->dirfd); |
187 | ||
188 | if (new_dirfd == -1) { | |
189 | PERROR("Failed to duplicate directory file descriptor of directory handle"); | |
190 | goto end; | |
191 | } | |
192 | new_handle = lttng_directory_handle_create_from_dirfd( | |
193 | new_dirfd); | |
194 | if (!new_handle && close(new_dirfd)) { | |
195 | PERROR("Failed to close directory file descriptor of directory handle"); | |
578e21bd JG |
196 | } |
197 | } | |
cbf53d23 JG |
198 | end: |
199 | return new_handle; | |
578e21bd JG |
200 | } |
201 | ||
46307ffe JG |
202 | static |
203 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) | |
204 | { | |
205 | handle->dirfd = -1; | |
206 | } | |
207 | ||
18710679 JG |
208 | static |
209 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, | |
210 | const char *path, struct stat *st) | |
211 | { | |
212 | return fstatat(handle->dirfd, path, st, 0); | |
213 | } | |
214 | ||
215 | static | |
216 | int lttng_directory_handle_mkdir( | |
217 | const struct lttng_directory_handle *handle, | |
218 | const char *path, mode_t mode) | |
219 | { | |
220 | return mkdirat(handle->dirfd, path, mode); | |
221 | } | |
222 | ||
223 | static | |
2912cead JG |
224 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
225 | const char *filename, int flags, mode_t mode) | |
226 | { | |
227 | return openat(handle->dirfd, filename, flags, mode); | |
228 | } | |
229 | ||
230 | static | |
231 | int _run_as_open(const struct lttng_directory_handle *handle, | |
232 | const char *filename, | |
233 | int flags, mode_t mode, uid_t uid, gid_t gid) | |
234 | { | |
235 | return run_as_openat(handle->dirfd, filename, flags, mode, uid, gid); | |
236 | } | |
237 | ||
238 | static | |
239 | int _run_as_unlink(const struct lttng_directory_handle *handle, | |
240 | const char *filename, uid_t uid, gid_t gid) | |
241 | { | |
242 | return run_as_unlinkat(handle->dirfd, filename, uid, gid); | |
243 | } | |
244 | ||
245 | static | |
246 | int lttng_directory_handle_unlink( | |
247 | const struct lttng_directory_handle *handle, | |
248 | const char *filename) | |
249 | { | |
250 | return unlinkat(handle->dirfd, filename, 0); | |
251 | } | |
252 | ||
253 | static | |
254 | int _run_as_mkdir(const struct lttng_directory_handle *handle, | |
255 | const char *path, mode_t mode, uid_t uid, gid_t gid) | |
18710679 JG |
256 | { |
257 | return run_as_mkdirat(handle->dirfd, path, mode, uid, gid); | |
258 | } | |
259 | ||
260 | static | |
261 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, | |
262 | const char *path, mode_t mode, uid_t uid, gid_t gid) | |
263 | { | |
264 | return run_as_mkdirat_recursive(handle->dirfd, path, mode, uid, gid); | |
265 | } | |
266 | ||
93bed9fe JG |
267 | static |
268 | int _lttng_directory_handle_rename( | |
269 | const struct lttng_directory_handle *old_handle, | |
270 | const char *old_name, | |
271 | const struct lttng_directory_handle *new_handle, | |
272 | const char *new_name) | |
273 | { | |
274 | return renameat(old_handle->dirfd, old_name, | |
275 | new_handle->dirfd, new_name); | |
276 | } | |
277 | ||
278 | static | |
279 | int _run_as_rename(const struct lttng_directory_handle *old_handle, | |
280 | const char *old_name, | |
281 | const struct lttng_directory_handle *new_handle, | |
282 | const char *new_name, uid_t uid, gid_t gid) | |
283 | { | |
284 | return run_as_renameat(old_handle->dirfd, old_name, new_handle->dirfd, | |
285 | new_name, uid, gid); | |
286 | } | |
287 | ||
288 | static | |
289 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, | |
290 | const char *path) | |
291 | { | |
292 | DIR *dir_stream = NULL; | |
293 | int fd = openat(handle->dirfd, path, O_RDONLY); | |
294 | ||
295 | if (fd < 0) { | |
296 | goto end; | |
297 | } | |
298 | ||
299 | dir_stream = fdopendir(fd); | |
300 | if (!dir_stream) { | |
301 | int ret; | |
302 | ||
303 | PERROR("Failed to open directory stream"); | |
304 | ret = close(fd); | |
305 | if (ret) { | |
306 | PERROR("Failed to close file descriptor to %s", path); | |
307 | } | |
308 | goto end; | |
309 | } | |
310 | ||
311 | end: | |
312 | return dir_stream; | |
313 | } | |
314 | ||
315 | static | |
316 | int lttng_directory_handle_rmdir( | |
317 | const struct lttng_directory_handle *handle, const char *name) | |
318 | { | |
319 | return unlinkat(handle->dirfd, name, AT_REMOVEDIR); | |
320 | } | |
321 | ||
322 | static | |
323 | int _run_as_rmdir(const struct lttng_directory_handle *handle, | |
324 | const char *name, uid_t uid, gid_t gid) | |
325 | { | |
326 | return run_as_rmdirat(handle->dirfd, name, uid, gid); | |
327 | } | |
328 | ||
329 | static | |
330 | int _run_as_rmdir_recursive( | |
331 | const struct lttng_directory_handle *handle, const char *name, | |
f75c5439 | 332 | uid_t uid, gid_t gid, int flags) |
93bed9fe | 333 | { |
f75c5439 | 334 | return run_as_rmdirat_recursive(handle->dirfd, name, uid, gid, flags); |
93bed9fe JG |
335 | } |
336 | ||
18710679 JG |
337 | #else /* COMPAT_DIRFD */ |
338 | ||
fd774fc6 JG |
339 | static |
340 | int get_full_path(const struct lttng_directory_handle *handle, | |
341 | const char *subdirectory, char *fullpath, size_t size) | |
342 | { | |
343 | int ret; | |
93bed9fe JG |
344 | const bool subdirectory_is_absolute = |
345 | subdirectory && *subdirectory == '/'; | |
346 | const char * const base = subdirectory_is_absolute ? | |
347 | subdirectory : handle->base_path; | |
348 | const char * const end = subdirectory && !subdirectory_is_absolute ? | |
349 | subdirectory : NULL; | |
350 | const size_t base_len = strlen(base); | |
351 | const size_t end_len = end ? strlen(end) : 0; | |
352 | const bool add_separator_slash = end && base[base_len - 1] != '/'; | |
353 | const bool add_trailing_slash = end && end[end_len - 1] != '/'; | |
354 | ||
355 | ret = snprintf(fullpath, size, "%s%s%s%s", | |
356 | base, | |
357 | add_separator_slash ? "/" : "", | |
358 | end ? end : "", | |
359 | add_trailing_slash ? "/" : ""); | |
fd774fc6 JG |
360 | if (ret == -1 || ret >= size) { |
361 | ERR("Failed to format subdirectory from directory handle"); | |
362 | ret = -1; | |
93bed9fe | 363 | goto end; |
fd774fc6 JG |
364 | } |
365 | ret = 0; | |
93bed9fe | 366 | end: |
fd774fc6 JG |
367 | return ret; |
368 | } | |
369 | ||
cbf53d23 JG |
370 | static |
371 | struct lttng_directory_handle *_lttng_directory_handle_create(char *path) | |
372 | { | |
373 | struct lttng_directory_handle *handle = zmalloc(sizeof(*handle)); | |
374 | ||
375 | if (!handle) { | |
376 | goto end; | |
377 | } | |
378 | urcu_ref_init(&handle->ref); | |
379 | handle->base_path = path; | |
380 | end: | |
381 | return handle; | |
382 | } | |
383 | ||
18710679 | 384 | LTTNG_HIDDEN |
cbf53d23 | 385 | struct lttng_directory_handle *lttng_directory_handle_create( |
18710679 JG |
386 | const char *path) |
387 | { | |
388 | int ret; | |
93bed9fe | 389 | const char *cwd = ""; |
fd774fc6 JG |
390 | size_t cwd_len, path_len; |
391 | char cwd_buf[LTTNG_PATH_MAX] = {}; | |
392 | char handle_buf[LTTNG_PATH_MAX] = {}; | |
cbf53d23 | 393 | struct lttng_directory_handle *new_handle = NULL; |
93bed9fe | 394 | bool add_cwd_slash = false, add_trailing_slash = false; |
fd774fc6 JG |
395 | const struct lttng_directory_handle cwd_handle = { |
396 | .base_path = handle_buf, | |
397 | }; | |
398 | ||
fd774fc6 | 399 | path_len = path ? strlen(path) : 0; |
fd774fc6 | 400 | add_trailing_slash = path && path[path_len - 1] != '/'; |
93bed9fe JG |
401 | if (!path || (path && *path != '/')) { |
402 | cwd = getcwd(cwd_buf, sizeof(cwd_buf)); | |
403 | if (!cwd) { | |
404 | PERROR("Failed to initialize directory handle, can't get current working directory"); | |
405 | ret = -1; | |
406 | goto end; | |
407 | } | |
408 | cwd_len = strlen(cwd); | |
409 | if (cwd_len == 0) { | |
410 | ERR("Failed to initialize directory handle, current working directory path has a length of 0"); | |
411 | ret = -1; | |
412 | goto end; | |
413 | } | |
414 | add_cwd_slash = cwd[cwd_len - 1] != '/'; | |
415 | } | |
fd774fc6 JG |
416 | |
417 | ret = snprintf(handle_buf, sizeof(handle_buf), "%s%s%s%s", | |
418 | cwd, | |
419 | add_cwd_slash ? "/" : "", | |
420 | path ? : "", | |
421 | add_trailing_slash ? "/" : ""); | |
422 | if (ret == -1 || ret >= LTTNG_PATH_MAX) { | |
423 | ERR("Failed to initialize directory handle, failed to format directory path"); | |
424 | goto end; | |
18710679 | 425 | } |
93bed9fe | 426 | |
cbf53d23 | 427 | new_handle = lttng_directory_handle_create_from_handle(path, &cwd_handle); |
fd774fc6 | 428 | end: |
cbf53d23 | 429 | return new_handle; |
fd774fc6 | 430 | } |
18710679 | 431 | |
fd774fc6 | 432 | LTTNG_HIDDEN |
cbf53d23 JG |
433 | struct lttng_directory_handle *lttng_directory_handle_create_from_handle( |
434 | const char *path, | |
435 | const struct lttng_directory_handle *ref_handle) | |
fd774fc6 JG |
436 | { |
437 | int ret; | |
438 | size_t path_len, handle_path_len; | |
439 | bool add_trailing_slash; | |
440 | struct stat stat_buf; | |
cbf53d23 JG |
441 | struct lttng_directory_handle *new_handle = NULL; |
442 | char *new_path = NULL; | |
18710679 | 443 | |
cbf53d23 | 444 | assert(ref_handle && ref_handle->base_path); |
fd774fc6 | 445 | |
cbf53d23 | 446 | ret = lttng_directory_handle_stat(ref_handle, path, &stat_buf); |
fd774fc6 JG |
447 | if (ret == -1) { |
448 | PERROR("Failed to create directory handle"); | |
449 | goto end; | |
450 | } else if (!S_ISDIR(stat_buf.st_mode)) { | |
451 | char full_path[LTTNG_PATH_MAX]; | |
452 | ||
453 | /* Best effort for logging purposes. */ | |
cbf53d23 | 454 | ret = get_full_path(ref_handle, path, full_path, |
fd774fc6 JG |
455 | sizeof(full_path)); |
456 | if (ret) { | |
457 | full_path[0] = '\0'; | |
18710679 | 458 | } |
fd774fc6 JG |
459 | |
460 | ERR("Failed to initialize directory handle to \"%s\": not a directory", | |
461 | full_path); | |
fd774fc6 JG |
462 | goto end; |
463 | } | |
464 | if (!path) { | |
cbf53d23 | 465 | new_handle = lttng_directory_handle_copy(ref_handle); |
fd774fc6 JG |
466 | goto end; |
467 | } | |
468 | ||
469 | path_len = strlen(path); | |
470 | if (path_len == 0) { | |
471 | ERR("Failed to initialize directory handle: provided path is an empty string"); | |
472 | ret = -1; | |
473 | goto end; | |
474 | } | |
475 | if (*path == '/') { | |
cbf53d23 JG |
476 | new_path = strdup(path); |
477 | if (!new_path) { | |
478 | goto end; | |
479 | } | |
480 | /* Takes ownership of new_path. */ | |
481 | new_handle = _lttng_directory_handle_create(new_path); | |
482 | new_path = NULL; | |
fd774fc6 | 483 | goto end; |
18710679 JG |
484 | } |
485 | ||
fd774fc6 JG |
486 | add_trailing_slash = path[path_len - 1] != '/'; |
487 | ||
cbf53d23 | 488 | handle_path_len = strlen(ref_handle->base_path) + path_len + |
fd774fc6 | 489 | !!add_trailing_slash; |
18710679 JG |
490 | if (handle_path_len >= LTTNG_PATH_MAX) { |
491 | ERR("Failed to initialize directory handle as the resulting path's length (%zu bytes) exceeds the maximal allowed length (%d bytes)", | |
492 | handle_path_len, LTTNG_PATH_MAX); | |
18710679 JG |
493 | goto end; |
494 | } | |
cbf53d23 JG |
495 | new_path = zmalloc(handle_path_len); |
496 | if (!new_path) { | |
18710679 | 497 | PERROR("Failed to initialize directory handle"); |
18710679 JG |
498 | goto end; |
499 | } | |
500 | ||
fd774fc6 | 501 | ret = sprintf(new_handle->base_path, "%s%s%s", |
cbf53d23 | 502 | ref_handle->base_path, |
fd774fc6 JG |
503 | path, |
504 | add_trailing_slash ? "/" : ""); | |
18710679 JG |
505 | if (ret == -1 || ret >= handle_path_len) { |
506 | ERR("Failed to initialize directory handle: path formatting failed"); | |
18710679 JG |
507 | goto end; |
508 | } | |
cbf53d23 JG |
509 | new_handle = _lttng_directory_handle_create(new_path); |
510 | new_path = NULL; | |
18710679 | 511 | end: |
cbf53d23 JG |
512 | free(new_path); |
513 | return new_handle; | |
18710679 JG |
514 | } |
515 | ||
516 | LTTNG_HIDDEN | |
cbf53d23 JG |
517 | struct lttng_directory_handle *lttng_directory_handle_create_from_dirfd( |
518 | int dirfd) | |
18710679 JG |
519 | { |
520 | assert(dirfd == AT_FDCWD); | |
cbf53d23 | 521 | return lttng_directory_handle_create(NULL); |
18710679 JG |
522 | } |
523 | ||
cbf53d23 JG |
524 | static |
525 | void lttng_directory_handle_release(struct urcu_ref *ref) | |
18710679 | 526 | { |
cbf53d23 JG |
527 | struct lttng_directory_handle *handle = |
528 | container_of(ref, struct lttng_directory_handle, ref); | |
529 | ||
18710679 | 530 | free(handle->base_path); |
46307ffe | 531 | lttng_directory_handle_invalidate(handle); |
cbf53d23 | 532 | free(handle); |
18710679 JG |
533 | } |
534 | ||
578e21bd | 535 | LTTNG_HIDDEN |
cbf53d23 JG |
536 | struct lttng_directory_handle *lttng_directory_handle_copy( |
537 | const struct lttng_directory_handle *handle) | |
578e21bd | 538 | { |
cbf53d23 JG |
539 | struct lttng_directory_handle *new_handle = NULL; |
540 | char *new_path = NULL; | |
541 | ||
542 | if (handle->base_path) { | |
543 | new_path = strdup(handle->base_path); | |
544 | if (!new_path) { | |
545 | goto end; | |
546 | } | |
547 | } | |
548 | new_handle = _lttng_directory_handle_create(new_path); | |
549 | end: | |
550 | return new_handle; | |
578e21bd JG |
551 | } |
552 | ||
46307ffe JG |
553 | static |
554 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) | |
555 | { | |
556 | handle->base_path = NULL; | |
557 | } | |
558 | ||
18710679 JG |
559 | static |
560 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, | |
561 | const char *subdirectory, struct stat *st) | |
562 | { | |
563 | int ret; | |
564 | char fullpath[LTTNG_PATH_MAX]; | |
565 | ||
566 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); | |
567 | if (ret) { | |
568 | errno = ENOMEM; | |
569 | goto end; | |
570 | } | |
571 | ||
572 | ret = stat(fullpath, st); | |
573 | end: | |
574 | return ret; | |
575 | } | |
576 | ||
577 | static | |
578 | int lttng_directory_handle_mkdir(const struct lttng_directory_handle *handle, | |
579 | const char *subdirectory, mode_t mode) | |
580 | { | |
581 | int ret; | |
582 | char fullpath[LTTNG_PATH_MAX]; | |
583 | ||
584 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); | |
585 | if (ret) { | |
586 | errno = ENOMEM; | |
587 | goto end; | |
588 | } | |
589 | ||
590 | ret = mkdir(fullpath, mode); | |
591 | end: | |
592 | return ret; | |
593 | } | |
594 | ||
2912cead JG |
595 | static |
596 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, | |
597 | const char *filename, int flags, mode_t mode) | |
598 | { | |
599 | int ret; | |
600 | char fullpath[LTTNG_PATH_MAX]; | |
601 | ||
602 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
603 | if (ret) { | |
604 | errno = ENOMEM; | |
605 | goto end; | |
606 | } | |
607 | ||
608 | ret = open(fullpath, flags, mode); | |
609 | end: | |
610 | return ret; | |
611 | } | |
612 | ||
613 | static | |
614 | int lttng_directory_handle_unlink( | |
615 | const struct lttng_directory_handle *handle, | |
616 | const char *filename) | |
617 | { | |
618 | int ret; | |
619 | char fullpath[LTTNG_PATH_MAX]; | |
620 | ||
621 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
622 | if (ret) { | |
623 | errno = ENOMEM; | |
624 | goto end; | |
625 | } | |
626 | ||
627 | ret = unlink(fullpath); | |
628 | end: | |
629 | return ret; | |
630 | } | |
631 | ||
18710679 JG |
632 | static |
633 | int _run_as_mkdir(const struct lttng_directory_handle *handle, const char *path, | |
634 | mode_t mode, uid_t uid, gid_t gid) | |
635 | { | |
636 | int ret; | |
637 | char fullpath[LTTNG_PATH_MAX]; | |
638 | ||
639 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); | |
640 | if (ret) { | |
641 | errno = ENOMEM; | |
642 | goto end; | |
643 | } | |
644 | ||
645 | ret = run_as_mkdir(fullpath, mode, uid, gid); | |
646 | end: | |
647 | return ret; | |
648 | } | |
649 | ||
2912cead JG |
650 | static |
651 | int _run_as_open(const struct lttng_directory_handle *handle, | |
652 | const char *filename, | |
653 | int flags, mode_t mode, uid_t uid, gid_t gid) | |
654 | { | |
655 | int ret; | |
656 | char fullpath[LTTNG_PATH_MAX]; | |
657 | ||
658 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
659 | if (ret) { | |
660 | errno = ENOMEM; | |
661 | goto end; | |
662 | } | |
663 | ||
664 | ret = run_as_open(fullpath, flags, mode, uid, gid); | |
665 | end: | |
666 | return ret; | |
667 | } | |
668 | ||
669 | static | |
670 | int _run_as_unlink(const struct lttng_directory_handle *handle, | |
671 | const char *filename, uid_t uid, gid_t gid) | |
672 | { | |
673 | int ret; | |
674 | char fullpath[LTTNG_PATH_MAX]; | |
675 | ||
676 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); | |
677 | if (ret) { | |
678 | errno = ENOMEM; | |
679 | goto end; | |
680 | } | |
681 | ||
682 | ret = run_as_unlink(fullpath, uid, gid); | |
683 | end: | |
684 | return ret; | |
685 | } | |
686 | ||
18710679 JG |
687 | static |
688 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, | |
689 | const char *path, mode_t mode, uid_t uid, gid_t gid) | |
690 | { | |
691 | int ret; | |
692 | char fullpath[LTTNG_PATH_MAX]; | |
693 | ||
694 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); | |
695 | if (ret) { | |
696 | errno = ENOMEM; | |
697 | goto end; | |
698 | } | |
699 | ||
700 | ret = run_as_mkdir_recursive(fullpath, mode, uid, gid); | |
701 | end: | |
702 | return ret; | |
703 | } | |
704 | ||
93bed9fe JG |
705 | static |
706 | int _lttng_directory_handle_rename( | |
707 | const struct lttng_directory_handle *old_handle, | |
708 | const char *old_name, | |
709 | const struct lttng_directory_handle *new_handle, | |
710 | const char *new_name) | |
711 | { | |
712 | int ret; | |
713 | char old_fullpath[LTTNG_PATH_MAX]; | |
714 | char new_fullpath[LTTNG_PATH_MAX]; | |
715 | ||
716 | ret = get_full_path(old_handle, old_name, old_fullpath, | |
717 | sizeof(old_fullpath)); | |
718 | if (ret) { | |
719 | errno = ENOMEM; | |
720 | goto end; | |
721 | } | |
722 | ret = get_full_path(new_handle, new_name, new_fullpath, | |
723 | sizeof(new_fullpath)); | |
724 | if (ret) { | |
725 | errno = ENOMEM; | |
726 | goto end; | |
727 | } | |
728 | ||
729 | ret = rename(old_fullpath, new_fullpath); | |
730 | end: | |
731 | return ret; | |
732 | } | |
733 | ||
734 | static | |
735 | int _run_as_rename(const struct lttng_directory_handle *old_handle, | |
736 | const char *old_name, | |
737 | const struct lttng_directory_handle *new_handle, | |
738 | const char *new_name, uid_t uid, gid_t gid) | |
739 | { | |
740 | int ret; | |
741 | char old_fullpath[LTTNG_PATH_MAX]; | |
742 | char new_fullpath[LTTNG_PATH_MAX]; | |
743 | ||
744 | ret = get_full_path(old_handle, old_name, old_fullpath, | |
745 | sizeof(old_fullpath)); | |
746 | if (ret) { | |
747 | errno = ENOMEM; | |
748 | goto end; | |
749 | } | |
750 | ret = get_full_path(new_handle, new_name, new_fullpath, | |
751 | sizeof(new_fullpath)); | |
752 | if (ret) { | |
753 | errno = ENOMEM; | |
754 | goto end; | |
755 | } | |
756 | ||
757 | ret = run_as_rename(old_fullpath, new_fullpath, uid, gid); | |
758 | end: | |
759 | return ret; | |
760 | } | |
761 | ||
762 | static | |
763 | DIR *lttng_directory_handle_opendir(const struct lttng_directory_handle *handle, | |
764 | const char *path) | |
765 | { | |
766 | int ret; | |
767 | DIR *dir_stream = NULL; | |
768 | char fullpath[LTTNG_PATH_MAX]; | |
769 | ||
770 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); | |
771 | if (ret) { | |
772 | errno = ENOMEM; | |
773 | goto end; | |
774 | } | |
775 | ||
776 | dir_stream = opendir(fullpath); | |
777 | end: | |
778 | return dir_stream; | |
779 | } | |
780 | ||
781 | static | |
782 | int lttng_directory_handle_rmdir( | |
783 | const struct lttng_directory_handle *handle, const char *name) | |
784 | { | |
785 | int ret; | |
786 | char fullpath[LTTNG_PATH_MAX]; | |
787 | ||
788 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); | |
789 | if (ret) { | |
790 | errno = ENOMEM; | |
791 | goto end; | |
792 | } | |
793 | ||
794 | ret = rmdir(fullpath); | |
795 | end: | |
796 | return ret; | |
797 | } | |
798 | ||
799 | static | |
800 | int _run_as_rmdir(const struct lttng_directory_handle *handle, | |
801 | const char *name, uid_t uid, gid_t gid) | |
802 | { | |
803 | int ret; | |
804 | char fullpath[LTTNG_PATH_MAX]; | |
805 | ||
806 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); | |
807 | if (ret) { | |
808 | errno = ENOMEM; | |
809 | goto end; | |
810 | } | |
811 | ||
812 | ret = run_as_rmdir(fullpath, uid, gid); | |
813 | end: | |
814 | return ret; | |
815 | } | |
816 | ||
817 | static | |
818 | int _run_as_rmdir_recursive( | |
819 | const struct lttng_directory_handle *handle, const char *name, | |
f75c5439 | 820 | uid_t uid, gid_t gid, int flags) |
93bed9fe JG |
821 | { |
822 | int ret; | |
823 | char fullpath[LTTNG_PATH_MAX]; | |
824 | ||
825 | ret = get_full_path(handle, name, fullpath, sizeof(fullpath)); | |
826 | if (ret) { | |
827 | errno = ENOMEM; | |
828 | goto end; | |
829 | } | |
830 | ||
f75c5439 | 831 | ret = run_as_rmdir_recursive(fullpath, uid, gid, flags); |
93bed9fe JG |
832 | end: |
833 | return ret; | |
834 | } | |
835 | ||
18710679 JG |
836 | #endif /* COMPAT_DIRFD */ |
837 | ||
93bed9fe JG |
838 | /* Common implementation. */ |
839 | ||
18710679 JG |
840 | /* |
841 | * On some filesystems (e.g. nfs), mkdir will validate access rights before | |
842 | * checking for the existence of the path element. This means that on a setup | |
843 | * where "/home/" is a mounted NFS share, and running as an unpriviledged user, | |
844 | * recursively creating a path of the form "/home/my_user/trace/" will fail with | |
845 | * EACCES on mkdir("/home", ...). | |
846 | * | |
847 | * Checking the path for existence allows us to work around this behaviour. | |
848 | */ | |
849 | static | |
850 | int create_directory_check_exists(const struct lttng_directory_handle *handle, | |
851 | const char *path, mode_t mode) | |
852 | { | |
853 | int ret = 0; | |
854 | struct stat st; | |
855 | ||
856 | ret = lttng_directory_handle_stat(handle, path, &st); | |
857 | if (ret == 0) { | |
858 | if (S_ISDIR(st.st_mode)) { | |
859 | /* Directory exists, skip. */ | |
860 | goto end; | |
861 | } else { | |
862 | /* Exists, but is not a directory. */ | |
863 | errno = ENOTDIR; | |
864 | ret = -1; | |
865 | goto end; | |
866 | } | |
93bed9fe JG |
867 | } else if (errno != ENOENT) { |
868 | goto end; | |
18710679 JG |
869 | } |
870 | ||
871 | /* | |
872 | * Let mkdir handle other errors as the caller expects mkdir | |
873 | * semantics. | |
874 | */ | |
875 | ret = lttng_directory_handle_mkdir(handle, path, mode); | |
876 | end: | |
877 | return ret; | |
878 | } | |
879 | ||
18710679 JG |
880 | static |
881 | int create_directory_recursive(const struct lttng_directory_handle *handle, | |
882 | const char *path, mode_t mode) | |
883 | { | |
884 | char *p, tmp[LTTNG_PATH_MAX]; | |
885 | size_t len; | |
886 | int ret; | |
887 | ||
888 | assert(path); | |
889 | ||
890 | ret = lttng_strncpy(tmp, path, sizeof(tmp)); | |
891 | if (ret) { | |
892 | ERR("Failed to create directory: provided path's length (%zu bytes) exceeds the maximal allowed length (%zu bytes)", | |
893 | strlen(path) + 1, sizeof(tmp)); | |
894 | goto error; | |
895 | } | |
896 | ||
897 | len = strlen(path); | |
898 | if (tmp[len - 1] == '/') { | |
899 | tmp[len - 1] = 0; | |
900 | } | |
901 | ||
902 | for (p = tmp + 1; *p; p++) { | |
903 | if (*p == '/') { | |
904 | *p = 0; | |
905 | if (tmp[strlen(tmp) - 1] == '.' && | |
906 | tmp[strlen(tmp) - 2] == '.' && | |
907 | tmp[strlen(tmp) - 3] == '/') { | |
908 | ERR("Using '/../' is not permitted in the trace path (%s)", | |
909 | tmp); | |
910 | ret = -1; | |
911 | goto error; | |
912 | } | |
913 | ret = create_directory_check_exists(handle, tmp, mode); | |
914 | if (ret < 0) { | |
915 | if (errno != EACCES) { | |
916 | PERROR("Failed to create directory \"%s\"", | |
917 | path); | |
918 | ret = -errno; | |
919 | goto error; | |
920 | } | |
921 | } | |
922 | *p = '/'; | |
923 | } | |
924 | } | |
925 | ||
926 | ret = create_directory_check_exists(handle, tmp, mode); | |
927 | if (ret < 0) { | |
928 | PERROR("mkdirat recursive last element"); | |
929 | ret = -errno; | |
930 | } | |
931 | error: | |
932 | return ret; | |
933 | } | |
934 | ||
cbf53d23 JG |
935 | LTTNG_HIDDEN |
936 | bool lttng_directory_handle_get(struct lttng_directory_handle *handle) | |
937 | { | |
938 | return urcu_ref_get_unless_zero(&handle->ref); | |
939 | } | |
940 | ||
941 | LTTNG_HIDDEN | |
942 | void lttng_directory_handle_put(struct lttng_directory_handle *handle) | |
943 | { | |
944 | if (!handle) { | |
945 | return; | |
946 | } | |
947 | assert(handle->ref.refcount); | |
948 | urcu_ref_put(&handle->ref, lttng_directory_handle_release); | |
949 | } | |
950 | ||
18710679 JG |
951 | LTTNG_HIDDEN |
952 | int lttng_directory_handle_create_subdirectory_as_user( | |
953 | const struct lttng_directory_handle *handle, | |
954 | const char *subdirectory, | |
69e3a560 | 955 | mode_t mode, const struct lttng_credentials *creds) |
18710679 JG |
956 | { |
957 | int ret; | |
958 | ||
959 | if (!creds) { | |
960 | /* Run as current user. */ | |
961 | ret = create_directory_check_exists(handle, | |
962 | subdirectory, mode); | |
963 | } else { | |
964 | ret = _run_as_mkdir(handle, subdirectory, | |
965 | mode, creds->uid, creds->gid); | |
966 | } | |
967 | ||
968 | return ret; | |
969 | } | |
970 | ||
971 | LTTNG_HIDDEN | |
972 | int lttng_directory_handle_create_subdirectory_recursive_as_user( | |
973 | const struct lttng_directory_handle *handle, | |
974 | const char *subdirectory_path, | |
69e3a560 | 975 | mode_t mode, const struct lttng_credentials *creds) |
18710679 JG |
976 | { |
977 | int ret; | |
978 | ||
979 | if (!creds) { | |
980 | /* Run as current user. */ | |
981 | ret = create_directory_recursive(handle, | |
982 | subdirectory_path, mode); | |
983 | } else { | |
984 | ret = _run_as_mkdir_recursive(handle, subdirectory_path, | |
985 | mode, creds->uid, creds->gid); | |
986 | } | |
987 | ||
988 | return ret; | |
989 | } | |
990 | ||
991 | LTTNG_HIDDEN | |
992 | int lttng_directory_handle_create_subdirectory( | |
993 | const struct lttng_directory_handle *handle, | |
994 | const char *subdirectory, | |
995 | mode_t mode) | |
996 | { | |
997 | return lttng_directory_handle_create_subdirectory_as_user( | |
998 | handle, subdirectory, mode, NULL); | |
999 | } | |
1000 | ||
1001 | LTTNG_HIDDEN | |
1002 | int lttng_directory_handle_create_subdirectory_recursive( | |
1003 | const struct lttng_directory_handle *handle, | |
1004 | const char *subdirectory_path, | |
1005 | mode_t mode) | |
1006 | { | |
1007 | return lttng_directory_handle_create_subdirectory_recursive_as_user( | |
1008 | handle, subdirectory_path, mode, NULL); | |
1009 | } | |
2912cead JG |
1010 | |
1011 | LTTNG_HIDDEN | |
1012 | int lttng_directory_handle_open_file_as_user( | |
1013 | const struct lttng_directory_handle *handle, | |
1014 | const char *filename, | |
1015 | int flags, mode_t mode, | |
1016 | const struct lttng_credentials *creds) | |
1017 | { | |
1018 | int ret; | |
1019 | ||
1020 | if (!creds) { | |
1021 | /* Run as current user. */ | |
1022 | ret = lttng_directory_handle_open(handle, filename, flags, | |
1023 | mode); | |
1024 | } else { | |
1025 | ret = _run_as_open(handle, filename, flags, mode, | |
1026 | creds->uid, creds->gid); | |
1027 | } | |
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | LTTNG_HIDDEN | |
1032 | int lttng_directory_handle_open_file( | |
1033 | const struct lttng_directory_handle *handle, | |
1034 | const char *filename, | |
1035 | int flags, mode_t mode) | |
1036 | { | |
1037 | return lttng_directory_handle_open_file_as_user(handle, filename, flags, | |
1038 | mode, NULL); | |
1039 | } | |
1040 | ||
1041 | LTTNG_HIDDEN | |
1042 | int lttng_directory_handle_unlink_file_as_user( | |
1043 | const struct lttng_directory_handle *handle, | |
1044 | const char *filename, | |
1045 | const struct lttng_credentials *creds) | |
1046 | { | |
1047 | int ret; | |
1048 | ||
1049 | if (!creds) { | |
1050 | /* Run as current user. */ | |
1051 | ret = lttng_directory_handle_unlink(handle, filename); | |
1052 | } else { | |
1053 | ret = _run_as_unlink(handle, filename, creds->uid, creds->gid); | |
1054 | } | |
1055 | return ret; | |
1056 | } | |
1057 | ||
1058 | LTTNG_HIDDEN | |
1059 | int lttng_directory_handle_unlink_file( | |
1060 | const struct lttng_directory_handle *handle, | |
1061 | const char *filename) | |
1062 | { | |
1063 | return lttng_directory_handle_unlink_file_as_user(handle, | |
1064 | filename, NULL); | |
1065 | } | |
93bed9fe JG |
1066 | |
1067 | LTTNG_HIDDEN | |
1068 | int lttng_directory_handle_rename( | |
1069 | const struct lttng_directory_handle *old_handle, | |
1070 | const char *old_name, | |
1071 | const struct lttng_directory_handle *new_handle, | |
1072 | const char *new_name) | |
1073 | { | |
1074 | return lttng_directory_handle_rename_as_user(old_handle, old_name, | |
1075 | new_handle, new_name, NULL); | |
1076 | } | |
1077 | ||
1078 | LTTNG_HIDDEN | |
1079 | int lttng_directory_handle_rename_as_user( | |
1080 | const struct lttng_directory_handle *old_handle, | |
1081 | const char *old_name, | |
1082 | const struct lttng_directory_handle *new_handle, | |
1083 | const char *new_name, | |
1084 | const struct lttng_credentials *creds) | |
1085 | { | |
1086 | int ret; | |
1087 | ||
1088 | if (!creds) { | |
1089 | /* Run as current user. */ | |
1090 | ret = _lttng_directory_handle_rename(old_handle, | |
1091 | old_name, new_handle, new_name); | |
1092 | } else { | |
1093 | ret = _run_as_rename(old_handle, old_name, new_handle, | |
1094 | new_name, creds->uid, creds->gid); | |
1095 | } | |
1096 | return ret; | |
1097 | } | |
1098 | ||
1099 | LTTNG_HIDDEN | |
1100 | int lttng_directory_handle_remove_subdirectory( | |
1101 | const struct lttng_directory_handle *handle, | |
1102 | const char *name) | |
1103 | { | |
1104 | return lttng_directory_handle_remove_subdirectory_as_user(handle, name, | |
1105 | NULL); | |
1106 | } | |
1107 | ||
1108 | LTTNG_HIDDEN | |
1109 | int lttng_directory_handle_remove_subdirectory_as_user( | |
1110 | const struct lttng_directory_handle *handle, | |
1111 | const char *name, | |
1112 | const struct lttng_credentials *creds) | |
1113 | { | |
1114 | int ret; | |
1115 | ||
1116 | if (!creds) { | |
1117 | /* Run as current user. */ | |
1118 | ret = lttng_directory_handle_rmdir(handle, name); | |
1119 | } else { | |
1120 | ret = _run_as_rmdir(handle, name, creds->uid, creds->gid); | |
1121 | } | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | struct rmdir_frame { | |
f75c5439 | 1126 | ssize_t parent_frame_idx; |
93bed9fe | 1127 | DIR *dir; |
f75c5439 | 1128 | bool empty; |
93bed9fe JG |
1129 | /* Size including '\0'. */ |
1130 | size_t path_size; | |
1131 | }; | |
1132 | ||
1133 | static | |
1134 | void rmdir_frame_fini(void *data) | |
1135 | { | |
41066401 | 1136 | int ret; |
93bed9fe JG |
1137 | struct rmdir_frame *frame = data; |
1138 | ||
41066401 FD |
1139 | ret = closedir(frame->dir); |
1140 | if (ret == -1) { | |
1141 | PERROR("Failed to close directory stream"); | |
1142 | } | |
93bed9fe JG |
1143 | } |
1144 | ||
1145 | static | |
1146 | int remove_directory_recursive(const struct lttng_directory_handle *handle, | |
f75c5439 | 1147 | const char *path, int flags) |
93bed9fe JG |
1148 | { |
1149 | int ret; | |
1150 | struct lttng_dynamic_array frames; | |
1151 | size_t current_frame_idx = 0; | |
1152 | struct rmdir_frame initial_frame = { | |
f75c5439 | 1153 | .parent_frame_idx = -1, |
93bed9fe | 1154 | .dir = lttng_directory_handle_opendir(handle, path), |
f75c5439 | 1155 | .empty = true, |
93bed9fe JG |
1156 | .path_size = strlen(path) + 1, |
1157 | }; | |
1158 | struct lttng_dynamic_buffer current_path; | |
1159 | const char separator = '/'; | |
1160 | ||
1161 | lttng_dynamic_buffer_init(¤t_path); | |
1162 | lttng_dynamic_array_init(&frames, sizeof(struct rmdir_frame), | |
f75c5439 MD |
1163 | rmdir_frame_fini); |
1164 | ||
1165 | if (flags & ~(LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG | | |
1166 | LTTNG_DIRECTORY_HANDLE_FAIL_NON_EMPTY_FLAG)) { | |
1167 | ERR("Unknown flags %d", flags); | |
1168 | ret = -1; | |
1169 | goto end; | |
1170 | } | |
1171 | ||
1172 | if (!initial_frame.dir) { | |
1173 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG && | |
1174 | errno == ENOENT) { | |
1175 | DBG("Cannot rmdir \"%s\": root does not exist", path); | |
1176 | ret = 0; | |
1177 | goto end; | |
1178 | } else { | |
1179 | PERROR("Failed to rmdir \"%s\"", path); | |
1180 | ret = -1; | |
1181 | goto end; | |
1182 | } | |
1183 | } | |
93bed9fe JG |
1184 | |
1185 | ret = lttng_dynamic_array_add_element(&frames, &initial_frame); | |
1186 | if (ret) { | |
1187 | ERR("Failed to push context frame during recursive directory removal"); | |
1188 | rmdir_frame_fini(&initial_frame); | |
1189 | goto end; | |
1190 | } | |
1191 | ||
f75c5439 MD |
1192 | ret = lttng_dynamic_buffer_append( |
1193 | ¤t_path, path, initial_frame.path_size); | |
1194 | if (ret) { | |
93bed9fe JG |
1195 | ERR("Failed to set initial path during recursive directory removal"); |
1196 | ret = -1; | |
1197 | goto end; | |
f75c5439 | 1198 | } |
93bed9fe | 1199 | |
f75c5439 | 1200 | while (lttng_dynamic_array_get_count(&frames) > 0) { |
93bed9fe JG |
1201 | struct dirent *entry; |
1202 | struct rmdir_frame *current_frame = | |
f75c5439 MD |
1203 | lttng_dynamic_array_get_element( |
1204 | &frames, current_frame_idx); | |
93bed9fe | 1205 | |
f75c5439 MD |
1206 | assert(current_frame->dir); |
1207 | ret = lttng_dynamic_buffer_set_size( | |
1208 | ¤t_path, current_frame->path_size); | |
93bed9fe JG |
1209 | assert(!ret); |
1210 | current_path.data[current_path.size - 1] = '\0'; | |
1211 | ||
1212 | while ((entry = readdir(current_frame->dir))) { | |
1213 | struct stat st; | |
93bed9fe | 1214 | |
f75c5439 MD |
1215 | if (!strcmp(entry->d_name, ".") || |
1216 | !strcmp(entry->d_name, "..")) { | |
93bed9fe JG |
1217 | continue; |
1218 | } | |
1219 | ||
1220 | /* Set current_path to the entry's path. */ | |
f75c5439 MD |
1221 | ret = lttng_dynamic_buffer_set_size( |
1222 | ¤t_path, current_path.size - 1); | |
93bed9fe JG |
1223 | assert(!ret); |
1224 | ret = lttng_dynamic_buffer_append(¤t_path, | |
1225 | &separator, sizeof(separator)); | |
1226 | if (ret) { | |
1227 | goto end; | |
1228 | } | |
1229 | ret = lttng_dynamic_buffer_append(¤t_path, | |
1230 | entry->d_name, | |
1231 | strlen(entry->d_name) + 1); | |
1232 | if (ret) { | |
1233 | goto end; | |
1234 | } | |
1235 | ||
f75c5439 MD |
1236 | if (lttng_directory_handle_stat( |
1237 | handle, current_path.data, &st)) { | |
1238 | if ((flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG) && | |
1239 | errno == ENOENT) { | |
1240 | break; | |
1241 | } | |
93bed9fe JG |
1242 | PERROR("Failed to stat \"%s\"", |
1243 | current_path.data); | |
1244 | ret = -1; | |
1245 | goto end; | |
1246 | } | |
1247 | ||
1248 | if (!S_ISDIR(st.st_mode)) { | |
f75c5439 MD |
1249 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG) { |
1250 | current_frame->empty = false; | |
1251 | break; | |
1252 | } else { | |
1253 | /* Not empty, abort. */ | |
1254 | DBG("Directory \"%s\" is not empty; refusing to remove directory", | |
1255 | current_path.data); | |
1256 | ret = -1; | |
1257 | goto end; | |
1258 | } | |
1259 | } else { | |
1260 | struct rmdir_frame new_frame = { | |
1261 | .path_size = current_path.size, | |
1262 | .dir = lttng_directory_handle_opendir( | |
1263 | handle, | |
1264 | current_path.data), | |
1265 | .empty = true, | |
1266 | .parent_frame_idx = current_frame_idx, | |
1267 | }; | |
1268 | ||
1269 | if (!new_frame.dir) { | |
1270 | if (flags & LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG && | |
1271 | errno == ENOENT) { | |
1272 | DBG("Non-existing directory stream during recursive directory removal"); | |
1273 | break; | |
1274 | } else { | |
1275 | PERROR("Failed to open directory stream during recursive directory removal"); | |
1276 | ret = -1; | |
1277 | goto end; | |
1278 | } | |
1279 | } | |
1280 | ret = lttng_dynamic_array_add_element( | |
1281 | &frames, &new_frame); | |
1282 | if (ret) { | |
1283 | ERR("Failed to push context frame during recursive directory removal"); | |
1284 | rmdir_frame_fini(&new_frame); | |
1285 | goto end; | |
1286 | } | |
1287 | current_frame_idx++; | |
1288 | /* We break iteration on readdir. */ | |
1289 | break; | |
93bed9fe | 1290 | } |
f75c5439 MD |
1291 | } |
1292 | if (entry) { | |
1293 | continue; | |
1294 | } | |
93bed9fe | 1295 | |
f75c5439 MD |
1296 | /* Pop rmdir frame. */ |
1297 | if (current_frame->empty) { | |
1298 | ret = lttng_directory_handle_rmdir( | |
1299 | handle, current_path.data); | |
93bed9fe | 1300 | if (ret) { |
f75c5439 MD |
1301 | if ((flags & LTTNG_DIRECTORY_HANDLE_FAIL_NON_EMPTY_FLAG) || |
1302 | errno != ENOENT) { | |
1303 | PERROR("Failed to remove \"%s\" during recursive directory removal", | |
1304 | current_path.data); | |
1305 | goto end; | |
1306 | } | |
1307 | DBG("Non-existing directory stream during recursive directory removal"); | |
93bed9fe | 1308 | } |
f75c5439 MD |
1309 | } else if (current_frame->parent_frame_idx >= 0) { |
1310 | struct rmdir_frame *parent_frame; | |
1311 | ||
1312 | parent_frame = lttng_dynamic_array_get_element(&frames, | |
1313 | current_frame->parent_frame_idx); | |
1314 | assert(parent_frame); | |
1315 | parent_frame->empty = false; | |
1316 | } | |
1317 | ret = lttng_dynamic_array_remove_element( | |
1318 | &frames, current_frame_idx); | |
1319 | if (ret) { | |
1320 | ERR("Failed to pop context frame during recursive directory removal"); | |
1321 | goto end; | |
1322 | } | |
1323 | current_frame_idx--; | |
93bed9fe JG |
1324 | } |
1325 | end: | |
1326 | lttng_dynamic_array_reset(&frames); | |
1327 | lttng_dynamic_buffer_reset(¤t_path); | |
1328 | return ret; | |
1329 | } | |
1330 | ||
1331 | LTTNG_HIDDEN | |
1332 | int lttng_directory_handle_remove_subdirectory_recursive( | |
1333 | const struct lttng_directory_handle *handle, | |
f75c5439 MD |
1334 | const char *name, |
1335 | int flags) | |
93bed9fe JG |
1336 | { |
1337 | return lttng_directory_handle_remove_subdirectory_recursive_as_user( | |
f75c5439 | 1338 | handle, name, NULL, flags); |
93bed9fe JG |
1339 | } |
1340 | ||
1341 | LTTNG_HIDDEN | |
1342 | int lttng_directory_handle_remove_subdirectory_recursive_as_user( | |
1343 | const struct lttng_directory_handle *handle, | |
1344 | const char *name, | |
f75c5439 MD |
1345 | const struct lttng_credentials *creds, |
1346 | int flags) | |
93bed9fe JG |
1347 | { |
1348 | int ret; | |
1349 | ||
1350 | if (!creds) { | |
1351 | /* Run as current user. */ | |
f75c5439 | 1352 | ret = remove_directory_recursive(handle, name, flags); |
93bed9fe JG |
1353 | } else { |
1354 | ret = _run_as_rmdir_recursive(handle, name, creds->uid, | |
f75c5439 | 1355 | creds->gid, flags); |
93bed9fe JG |
1356 | } |
1357 | return ret; | |
1358 | } |