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56ebfaf1 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2015 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/prctl.h> | |
23 | #include <curl/curl.h> | |
24 | ||
7079cfef | 25 | #include "sd-daemon.h" |
07630cea | 26 | |
b5efdb8a | 27 | #include "alloc-util.h" |
56ebfaf1 | 28 | #include "btrfs-util.h" |
07630cea LP |
29 | #include "copy.h" |
30 | #include "curl-util.h" | |
3ffd4af2 | 31 | #include "fd-util.h" |
0d39fa9c | 32 | #include "fileio.h" |
f4f15635 | 33 | #include "fs-util.h" |
07630cea LP |
34 | #include "hostname-util.h" |
35 | #include "import-common.h" | |
36 | #include "import-util.h" | |
56ebfaf1 LP |
37 | #include "macro.h" |
38 | #include "mkdir.h" | |
26166c88 | 39 | #include "path-util.h" |
25300b5a | 40 | #include "process-util.h" |
dc2c282b | 41 | #include "pull-common.h" |
07630cea | 42 | #include "pull-job.h" |
3ffd4af2 | 43 | #include "pull-tar.h" |
07630cea LP |
44 | #include "rm-rf.h" |
45 | #include "string-util.h" | |
46 | #include "strv.h" | |
47 | #include "utf8.h" | |
48 | #include "util.h" | |
49cf4170 | 49 | #include "web-util.h" |
56ebfaf1 | 50 | |
7079cfef LP |
51 | typedef enum TarProgress { |
52 | TAR_DOWNLOADING, | |
53 | TAR_VERIFYING, | |
54 | TAR_FINALIZING, | |
55 | TAR_COPYING, | |
56 | } TarProgress; | |
57 | ||
dc2c282b | 58 | struct TarPull { |
56ebfaf1 LP |
59 | sd_event *event; |
60 | CurlGlue *glue; | |
61 | ||
62 | char *image_root; | |
63 | ||
dc2c282b | 64 | PullJob *tar_job; |
9854730b | 65 | PullJob *settings_job; |
dc2c282b LP |
66 | PullJob *checksum_job; |
67 | PullJob *signature_job; | |
56ebfaf1 | 68 | |
dc2c282b | 69 | TarPullFinished on_finished; |
56ebfaf1 LP |
70 | void *userdata; |
71 | ||
56ebfaf1 LP |
72 | char *local; |
73 | bool force_local; | |
26166c88 | 74 | bool grow_machine_directory; |
9854730b | 75 | bool settings; |
56ebfaf1 LP |
76 | |
77 | pid_t tar_pid; | |
78 | ||
56ebfaf1 | 79 | char *final_path; |
9854730b LP |
80 | char *temp_path; |
81 | ||
82 | char *settings_path; | |
83 | char *settings_temp_path; | |
0100b6e1 LP |
84 | |
85 | ImportVerify verify; | |
56ebfaf1 LP |
86 | }; |
87 | ||
dc2c282b | 88 | TarPull* tar_pull_unref(TarPull *i) { |
56ebfaf1 LP |
89 | if (!i) |
90 | return NULL; | |
91 | ||
0100b6e1 | 92 | if (i->tar_pid > 1) { |
8b71fce8 | 93 | (void) kill_and_sigcont(i->tar_pid, SIGKILL); |
0100b6e1 | 94 | (void) wait_for_terminate(i->tar_pid, NULL); |
56ebfaf1 LP |
95 | } |
96 | ||
dc2c282b | 97 | pull_job_unref(i->tar_job); |
9854730b | 98 | pull_job_unref(i->settings_job); |
dc2c282b LP |
99 | pull_job_unref(i->checksum_job); |
100 | pull_job_unref(i->signature_job); | |
56ebfaf1 LP |
101 | |
102 | curl_glue_unref(i->glue); | |
103 | sd_event_unref(i->event); | |
104 | ||
105 | if (i->temp_path) { | |
d9e2daaf | 106 | (void) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); |
0d6e763b | 107 | free(i->temp_path); |
56ebfaf1 LP |
108 | } |
109 | ||
9854730b LP |
110 | if (i->settings_temp_path) { |
111 | (void) unlink(i->settings_temp_path); | |
112 | free(i->settings_temp_path); | |
113 | } | |
114 | ||
56ebfaf1 | 115 | free(i->final_path); |
9854730b | 116 | free(i->settings_path); |
56ebfaf1 LP |
117 | free(i->image_root); |
118 | free(i->local); | |
56ebfaf1 LP |
119 | free(i); |
120 | ||
121 | return NULL; | |
122 | } | |
123 | ||
dc2c282b LP |
124 | int tar_pull_new( |
125 | TarPull **ret, | |
8b71fce8 LP |
126 | sd_event *event, |
127 | const char *image_root, | |
dc2c282b | 128 | TarPullFinished on_finished, |
8b71fce8 LP |
129 | void *userdata) { |
130 | ||
dc2c282b | 131 | _cleanup_(tar_pull_unrefp) TarPull *i = NULL; |
56ebfaf1 LP |
132 | int r; |
133 | ||
134 | assert(ret); | |
56ebfaf1 | 135 | |
dc2c282b | 136 | i = new0(TarPull, 1); |
56ebfaf1 LP |
137 | if (!i) |
138 | return -ENOMEM; | |
139 | ||
140 | i->on_finished = on_finished; | |
141 | i->userdata = userdata; | |
142 | ||
143 | i->image_root = strdup(image_root ?: "/var/lib/machines"); | |
144 | if (!i->image_root) | |
145 | return -ENOMEM; | |
146 | ||
26166c88 LP |
147 | i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines"); |
148 | ||
9854730b LP |
149 | if (event) |
150 | i->event = sd_event_ref(event); | |
151 | else { | |
152 | r = sd_event_default(&i->event); | |
153 | if (r < 0) | |
154 | return r; | |
155 | } | |
56ebfaf1 LP |
156 | |
157 | r = curl_glue_new(&i->glue, i->event); | |
158 | if (r < 0) | |
159 | return r; | |
160 | ||
dc2c282b | 161 | i->glue->on_finished = pull_job_curl_on_finished; |
56ebfaf1 LP |
162 | i->glue->userdata = i; |
163 | ||
164 | *ret = i; | |
165 | i = NULL; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
dc2c282b | 170 | static void tar_pull_report_progress(TarPull *i, TarProgress p) { |
7079cfef LP |
171 | unsigned percent; |
172 | ||
173 | assert(i); | |
174 | ||
175 | switch (p) { | |
176 | ||
177 | case TAR_DOWNLOADING: { | |
178 | unsigned remain = 85; | |
179 | ||
180 | percent = 0; | |
181 | ||
9854730b LP |
182 | if (i->settings_job) { |
183 | percent += i->settings_job->progress_percent * 5 / 100; | |
184 | remain -= 5; | |
185 | } | |
186 | ||
7079cfef LP |
187 | if (i->checksum_job) { |
188 | percent += i->checksum_job->progress_percent * 5 / 100; | |
189 | remain -= 5; | |
190 | } | |
191 | ||
192 | if (i->signature_job) { | |
193 | percent += i->signature_job->progress_percent * 5 / 100; | |
194 | remain -= 5; | |
195 | } | |
196 | ||
197 | if (i->tar_job) | |
198 | percent += i->tar_job->progress_percent * remain / 100; | |
199 | break; | |
200 | } | |
201 | ||
202 | case TAR_VERIFYING: | |
203 | percent = 85; | |
204 | break; | |
205 | ||
206 | case TAR_FINALIZING: | |
207 | percent = 90; | |
208 | break; | |
209 | ||
210 | case TAR_COPYING: | |
211 | percent = 95; | |
212 | break; | |
213 | ||
214 | default: | |
215 | assert_not_reached("Unknown progress state"); | |
216 | } | |
217 | ||
218 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
219 | log_debug("Combined progress %u%%", percent); | |
220 | } | |
221 | ||
dc2c282b | 222 | static int tar_pull_make_local_copy(TarPull *i) { |
0d6e763b LP |
223 | int r; |
224 | ||
225 | assert(i); | |
226 | assert(i->tar_job); | |
227 | ||
228 | if (!i->local) | |
229 | return 0; | |
230 | ||
231 | if (!i->final_path) { | |
dc2c282b | 232 | r = pull_make_path(i->tar_job->url, i->tar_job->etag, i->image_root, ".tar-", NULL, &i->final_path); |
0d6e763b LP |
233 | if (r < 0) |
234 | return log_oom(); | |
0d6e763b LP |
235 | } |
236 | ||
dc2c282b | 237 | r = pull_make_local_copy(i->final_path, i->image_root, i->local, i->force_local); |
0100b6e1 LP |
238 | if (r < 0) |
239 | return r; | |
240 | ||
9854730b LP |
241 | if (i->settings) { |
242 | const char *local_settings; | |
243 | assert(i->settings_job); | |
244 | ||
245 | if (!i->settings_path) { | |
246 | r = pull_make_path(i->settings_job->url, i->settings_job->etag, i->image_root, ".settings-", NULL, &i->settings_path); | |
247 | if (r < 0) | |
248 | return log_oom(); | |
249 | } | |
250 | ||
251 | local_settings = strjoina(i->image_root, "/", i->local, ".nspawn"); | |
252 | ||
253 | r = copy_file_atomic(i->settings_path, local_settings, 0664, i->force_local, 0); | |
254 | if (r == -EEXIST) | |
255 | log_warning_errno(r, "Settings file %s already exists, not replacing.", local_settings); | |
256 | else if (r < 0 && r != -ENOENT) | |
79b6198b LP |
257 | log_warning_errno(r, "Failed to copy settings files %s, ignoring: %m", local_settings); |
258 | else | |
259 | log_info("Created new settings file '%s.nspawn'", i->local); | |
9854730b LP |
260 | } |
261 | ||
0d6e763b LP |
262 | return 0; |
263 | } | |
264 | ||
dc2c282b | 265 | static bool tar_pull_is_done(TarPull *i) { |
8b71fce8 LP |
266 | assert(i); |
267 | assert(i->tar_job); | |
268 | ||
9854730b | 269 | if (!PULL_JOB_IS_COMPLETE(i->tar_job)) |
8b71fce8 | 270 | return false; |
9854730b | 271 | if (i->settings_job && !PULL_JOB_IS_COMPLETE(i->settings_job)) |
8b71fce8 | 272 | return false; |
9854730b LP |
273 | if (i->checksum_job && !PULL_JOB_IS_COMPLETE(i->checksum_job)) |
274 | return false; | |
275 | if (i->signature_job && !PULL_JOB_IS_COMPLETE(i->signature_job)) | |
8b71fce8 LP |
276 | return false; |
277 | ||
278 | return true; | |
279 | } | |
280 | ||
dc2c282b LP |
281 | static void tar_pull_job_on_finished(PullJob *j) { |
282 | TarPull *i; | |
56ebfaf1 LP |
283 | int r; |
284 | ||
285 | assert(j); | |
286 | assert(j->userdata); | |
287 | ||
288 | i = j->userdata; | |
9854730b LP |
289 | |
290 | if (j == i->settings_job) { | |
291 | if (j->error != 0) | |
292 | log_info_errno(j->error, "Settings file could not be retrieved, proceeding without."); | |
293 | } else if (j->error != 0) { | |
0100b6e1 LP |
294 | if (j == i->checksum_job) |
295 | log_error_errno(j->error, "Failed to retrieve SHA256 checksum, cannot verify. (Try --verify=no?)"); | |
296 | else if (j == i->signature_job) | |
297 | log_error_errno(j->error, "Failed to retrieve signature file, cannot verify. (Try --verify=no?)"); | |
298 | else | |
299 | log_error_errno(j->error, "Failed to retrieve image file. (Wrong URL?)"); | |
300 | ||
56ebfaf1 LP |
301 | r = j->error; |
302 | goto finish; | |
303 | } | |
304 | ||
305 | /* This is invoked if either the download completed | |
306 | * successfully, or the download was skipped because we | |
307 | * already have the etag. */ | |
308 | ||
dc2c282b | 309 | if (!tar_pull_is_done(i)) |
0100b6e1 LP |
310 | return; |
311 | ||
9854730b LP |
312 | i->tar_job->disk_fd = safe_close(i->tar_job->disk_fd); |
313 | if (i->settings_job) | |
314 | i->settings_job->disk_fd = safe_close(i->settings_job->disk_fd); | |
56ebfaf1 LP |
315 | |
316 | if (i->tar_pid > 0) { | |
317 | r = wait_for_terminate_and_warn("tar", i->tar_pid, true); | |
318 | i->tar_pid = 0; | |
319 | if (r < 0) | |
320 | goto finish; | |
9854730b LP |
321 | if (r > 0) { |
322 | r = -EIO; | |
323 | goto finish; | |
324 | } | |
56ebfaf1 LP |
325 | } |
326 | ||
0100b6e1 LP |
327 | if (!i->tar_job->etag_exists) { |
328 | /* This is a new download, verify it, and move it into place */ | |
329 | ||
dc2c282b | 330 | tar_pull_report_progress(i, TAR_VERIFYING); |
7079cfef | 331 | |
9854730b | 332 | r = pull_verify(i->tar_job, i->settings_job, i->checksum_job, i->signature_job); |
0100b6e1 LP |
333 | if (r < 0) |
334 | goto finish; | |
335 | ||
dc2c282b | 336 | tar_pull_report_progress(i, TAR_FINALIZING); |
7079cfef | 337 | |
b6e676ce | 338 | r = import_make_read_only(i->temp_path); |
56ebfaf1 LP |
339 | if (r < 0) |
340 | goto finish; | |
341 | ||
f85ef957 AC |
342 | r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path); |
343 | if (r < 0) { | |
344 | log_error_errno(r, "Failed to rename to final image name: %m"); | |
56ebfaf1 LP |
345 | goto finish; |
346 | } | |
56ebfaf1 | 347 | |
9854730b LP |
348 | i->temp_path = mfree(i->temp_path); |
349 | ||
350 | if (i->settings_job && | |
351 | i->settings_job->error == 0 && | |
352 | !i->settings_job->etag_exists) { | |
353 | ||
354 | assert(i->settings_temp_path); | |
355 | assert(i->settings_path); | |
356 | ||
357 | /* Also move the settings file into place, if | |
358 | * it exist. Note that we do so only if we | |
359 | * also moved the tar file in place, to keep | |
360 | * things strictly in sync. */ | |
361 | ||
362 | r = import_make_read_only(i->settings_temp_path); | |
363 | if (r < 0) | |
364 | goto finish; | |
365 | ||
366 | r = rename_noreplace(AT_FDCWD, i->settings_temp_path, AT_FDCWD, i->settings_path); | |
367 | if (r < 0) { | |
368 | log_error_errno(r, "Failed to rename settings file: %m"); | |
369 | goto finish; | |
370 | } | |
371 | ||
372 | i->settings_temp_path = mfree(i->settings_temp_path); | |
373 | } | |
56ebfaf1 LP |
374 | } |
375 | ||
dc2c282b | 376 | tar_pull_report_progress(i, TAR_COPYING); |
7079cfef | 377 | |
dc2c282b | 378 | r = tar_pull_make_local_copy(i); |
0d6e763b LP |
379 | if (r < 0) |
380 | goto finish; | |
381 | ||
56ebfaf1 LP |
382 | r = 0; |
383 | ||
384 | finish: | |
56ebfaf1 LP |
385 | if (i->on_finished) |
386 | i->on_finished(i, r, i->userdata); | |
387 | else | |
388 | sd_event_exit(i->event, r); | |
389 | } | |
390 | ||
9854730b | 391 | static int tar_pull_job_on_open_disk_tar(PullJob *j) { |
dc2c282b | 392 | TarPull *i; |
56ebfaf1 LP |
393 | int r; |
394 | ||
395 | assert(j); | |
396 | assert(j->userdata); | |
397 | ||
398 | i = j->userdata; | |
8b71fce8 LP |
399 | assert(i->tar_job == j); |
400 | assert(!i->final_path); | |
401 | assert(!i->temp_path); | |
402 | assert(i->tar_pid <= 0); | |
56ebfaf1 | 403 | |
dc2c282b | 404 | r = pull_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &i->final_path); |
56ebfaf1 LP |
405 | if (r < 0) |
406 | return log_oom(); | |
407 | ||
14bcf25c | 408 | r = tempfn_random(i->final_path, NULL, &i->temp_path); |
56ebfaf1 LP |
409 | if (r < 0) |
410 | return log_oom(); | |
411 | ||
412 | mkdir_parents_label(i->temp_path, 0700); | |
413 | ||
414 | r = btrfs_subvol_make(i->temp_path); | |
415 | if (r == -ENOTTY) { | |
416 | if (mkdir(i->temp_path, 0755) < 0) | |
417 | return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path); | |
418 | } else if (r < 0) | |
709f6e46 | 419 | return log_error_errno(r, "Failed to create subvolume %s: %m", i->temp_path); |
8c9cfc28 LP |
420 | else |
421 | (void) import_assign_pool_quota_and_warn(i->temp_path); | |
56ebfaf1 | 422 | |
587fec42 | 423 | j->disk_fd = import_fork_tar_x(i->temp_path, &i->tar_pid); |
2c140ded LP |
424 | if (j->disk_fd < 0) |
425 | return j->disk_fd; | |
56ebfaf1 LP |
426 | |
427 | return 0; | |
428 | } | |
429 | ||
9854730b LP |
430 | static int tar_pull_job_on_open_disk_settings(PullJob *j) { |
431 | TarPull *i; | |
432 | int r; | |
433 | ||
434 | assert(j); | |
435 | assert(j->userdata); | |
436 | ||
437 | i = j->userdata; | |
438 | assert(i->settings_job == j); | |
439 | assert(!i->settings_path); | |
440 | assert(!i->settings_temp_path); | |
441 | ||
442 | r = pull_make_path(j->url, j->etag, i->image_root, ".settings-", NULL, &i->settings_path); | |
443 | if (r < 0) | |
444 | return log_oom(); | |
445 | ||
446 | r = tempfn_random(i->settings_path, NULL, &i->settings_temp_path); | |
447 | if (r < 0) | |
448 | return log_oom(); | |
449 | ||
450 | mkdir_parents_label(i->settings_temp_path, 0700); | |
451 | ||
452 | j->disk_fd = open(i->settings_temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664); | |
453 | if (j->disk_fd < 0) | |
454 | return log_error_errno(errno, "Failed to create %s: %m", i->settings_temp_path); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
dc2c282b LP |
459 | static void tar_pull_job_on_progress(PullJob *j) { |
460 | TarPull *i; | |
7079cfef LP |
461 | |
462 | assert(j); | |
463 | assert(j->userdata); | |
464 | ||
465 | i = j->userdata; | |
466 | ||
dc2c282b | 467 | tar_pull_report_progress(i, TAR_DOWNLOADING); |
7079cfef LP |
468 | } |
469 | ||
9854730b LP |
470 | int tar_pull_start( |
471 | TarPull *i, | |
472 | const char *url, | |
473 | const char *local, | |
474 | bool force_local, | |
475 | ImportVerify verify, | |
476 | bool settings) { | |
477 | ||
56ebfaf1 LP |
478 | int r; |
479 | ||
480 | assert(i); | |
9854730b LP |
481 | assert(verify < _IMPORT_VERIFY_MAX); |
482 | assert(verify >= 0); | |
56ebfaf1 | 483 | |
56ebfaf1 LP |
484 | if (!http_url_is_valid(url)) |
485 | return -EINVAL; | |
486 | ||
487 | if (local && !machine_name_is_valid(local)) | |
488 | return -EINVAL; | |
489 | ||
8b71fce8 LP |
490 | if (i->tar_job) |
491 | return -EBUSY; | |
492 | ||
56ebfaf1 LP |
493 | r = free_and_strdup(&i->local, local); |
494 | if (r < 0) | |
495 | return r; | |
9854730b | 496 | |
56ebfaf1 | 497 | i->force_local = force_local; |
0100b6e1 | 498 | i->verify = verify; |
9854730b | 499 | i->settings = settings; |
56ebfaf1 | 500 | |
9854730b | 501 | /* Set up download job for TAR file */ |
dc2c282b | 502 | r = pull_job_new(&i->tar_job, url, i->glue, i); |
56ebfaf1 LP |
503 | if (r < 0) |
504 | return r; | |
505 | ||
dc2c282b | 506 | i->tar_job->on_finished = tar_pull_job_on_finished; |
9854730b | 507 | i->tar_job->on_open_disk = tar_pull_job_on_open_disk_tar; |
dc2c282b | 508 | i->tar_job->on_progress = tar_pull_job_on_progress; |
0100b6e1 | 509 | i->tar_job->calc_checksum = verify != IMPORT_VERIFY_NO; |
26166c88 | 510 | i->tar_job->grow_machine_directory = i->grow_machine_directory; |
56ebfaf1 | 511 | |
dc2c282b | 512 | r = pull_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags); |
56ebfaf1 LP |
513 | if (r < 0) |
514 | return r; | |
515 | ||
9854730b LP |
516 | /* Set up download job for the settings file (.nspawn) */ |
517 | if (settings) { | |
518 | r = pull_make_settings_job(&i->settings_job, url, i->glue, tar_pull_job_on_finished, i); | |
519 | if (r < 0) | |
520 | return r; | |
521 | ||
522 | i->settings_job->on_open_disk = tar_pull_job_on_open_disk_settings; | |
523 | i->settings_job->on_progress = tar_pull_job_on_progress; | |
524 | i->settings_job->calc_checksum = verify != IMPORT_VERIFY_NO; | |
525 | ||
526 | r = pull_find_old_etags(i->settings_job->url, i->image_root, DT_REG, ".settings-", NULL, &i->settings_job->old_etags); | |
527 | if (r < 0) | |
528 | return r; | |
529 | } | |
530 | ||
531 | /* Set up download of checksum/signature files */ | |
dc2c282b | 532 | r = pull_make_verification_jobs(&i->checksum_job, &i->signature_job, verify, url, i->glue, tar_pull_job_on_finished, i); |
0100b6e1 LP |
533 | if (r < 0) |
534 | return r; | |
535 | ||
dc2c282b | 536 | r = pull_job_begin(i->tar_job); |
0100b6e1 LP |
537 | if (r < 0) |
538 | return r; | |
539 | ||
9854730b LP |
540 | if (i->settings_job) { |
541 | r = pull_job_begin(i->settings_job); | |
542 | if (r < 0) | |
543 | return r; | |
544 | } | |
545 | ||
0100b6e1 | 546 | if (i->checksum_job) { |
dc2c282b | 547 | i->checksum_job->on_progress = tar_pull_job_on_progress; |
7079cfef | 548 | |
dc2c282b | 549 | r = pull_job_begin(i->checksum_job); |
0100b6e1 LP |
550 | if (r < 0) |
551 | return r; | |
552 | } | |
553 | ||
554 | if (i->signature_job) { | |
dc2c282b | 555 | i->signature_job->on_progress = tar_pull_job_on_progress; |
7079cfef | 556 | |
dc2c282b | 557 | r = pull_job_begin(i->signature_job); |
0100b6e1 LP |
558 | if (r < 0) |
559 | return r; | |
560 | } | |
561 | ||
562 | return 0; | |
56ebfaf1 | 563 | } |