Commit | Line | Data |
---|---|---|
5b74c7b1 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
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. | |
91d76f53 | 7 | * |
5b74c7b1 DG |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
d14d33bf | 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
5b74c7b1 DG |
11 | * GNU General Public License for more details. |
12 | * | |
d14d33bf AM |
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. | |
5b74c7b1 DG |
16 | */ |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
6c9cc2ab | 19 | #include <limits.h> |
d022620a | 20 | #include <inttypes.h> |
5b74c7b1 DG |
21 | #include <stdio.h> |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
a304c14c | 24 | #include <sys/stat.h> |
f6a9efaa | 25 | #include <urcu.h> |
3d071855 MD |
26 | #include <dirent.h> |
27 | #include <sys/types.h> | |
6af972a2 | 28 | #include <pthread.h> |
5b74c7b1 | 29 | |
990570ed | 30 | #include <common/common.h> |
698fb2ed JG |
31 | #include <common/utils.h> |
32 | #include <common/trace-chunk.h> | |
db758600 | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
5d65beab | 34 | #include <lttng/location-internal.h> |
48a86f68 JG |
35 | #include "lttng-sessiond.h" |
36 | #include "kernel.h" | |
1e307fab | 37 | |
5b74c7b1 | 38 | #include "session.h" |
23324029 | 39 | #include "utils.h" |
dd73d57b | 40 | #include "trace-ust.h" |
51bb4dbb | 41 | #include "timer.h" |
5b74c7b1 | 42 | |
8c0faa1d | 43 | /* |
b5541356 | 44 | * NOTES: |
8c0faa1d | 45 | * |
b5541356 DG |
46 | * No ltt_session.lock is taken here because those data structure are widely |
47 | * spread across the lttng-tools code base so before caling functions below | |
48 | * that can read/write a session, the caller MUST acquire the session lock | |
54d01ffb | 49 | * using session_lock() and session_unlock(). |
8c0faa1d | 50 | */ |
8c0faa1d | 51 | |
5b74c7b1 | 52 | /* |
b5541356 | 53 | * Init tracing session list. |
5b74c7b1 | 54 | * |
b5541356 | 55 | * Please see session.h for more explanation and correct usage of the list. |
5b74c7b1 | 56 | */ |
b5541356 DG |
57 | static struct ltt_session_list ltt_session_list = { |
58 | .head = CDS_LIST_HEAD_INIT(ltt_session_list.head), | |
59 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
6af972a2 | 60 | .removal_cond = PTHREAD_COND_INITIALIZER, |
a24f7994 | 61 | .next_uuid = 0, |
b5541356 | 62 | }; |
5b74c7b1 | 63 | |
1c1c3634 DG |
64 | /* These characters are forbidden in a session name. Used by validate_name. */ |
65 | static const char *forbidden_name_chars = "/"; | |
66 | ||
23324029 JD |
67 | /* Global hash table to keep the sessions, indexed by id. */ |
68 | static struct lttng_ht *ltt_sessions_ht_by_id = NULL; | |
69 | ||
698fb2ed JG |
70 | struct consumer_create_chunk_transaction { |
71 | struct consumer_socket *socket; | |
72 | struct lttng_trace_chunk *new_chunk; | |
73 | struct lttng_trace_chunk *previous_chunk; | |
74 | bool new_chunk_created; | |
75 | }; | |
76 | ||
1c1c3634 DG |
77 | /* |
78 | * Validate the session name for forbidden characters. | |
79 | * | |
80 | * Return 0 on success else -1 meaning a forbidden char. has been found. | |
81 | */ | |
82 | static int validate_name(const char *name) | |
83 | { | |
84 | int ret; | |
85 | char *tok, *tmp_name; | |
86 | ||
87 | assert(name); | |
88 | ||
89 | tmp_name = strdup(name); | |
90 | if (!tmp_name) { | |
91 | /* ENOMEM here. */ | |
92 | ret = -1; | |
93 | goto error; | |
94 | } | |
95 | ||
96 | tok = strpbrk(tmp_name, forbidden_name_chars); | |
97 | if (tok) { | |
98 | DBG("Session name %s contains a forbidden character", name); | |
99 | /* Forbidden character has been found. */ | |
100 | ret = -1; | |
101 | goto error; | |
102 | } | |
103 | ret = 0; | |
104 | ||
105 | error: | |
106 | free(tmp_name); | |
107 | return ret; | |
108 | } | |
109 | ||
5b74c7b1 | 110 | /* |
050349bb | 111 | * Add a ltt_session structure to the global list. |
5b74c7b1 | 112 | * |
050349bb | 113 | * The caller MUST acquire the session list lock before. |
44e96653 | 114 | * Returns the unique identifier for the session. |
5b74c7b1 | 115 | */ |
d022620a | 116 | static uint64_t add_session_list(struct ltt_session *ls) |
5b74c7b1 | 117 | { |
0525e9ae DG |
118 | assert(ls); |
119 | ||
5b74c7b1 | 120 | cds_list_add(&ls->list, <t_session_list.head); |
a24f7994 | 121 | return ltt_session_list.next_uuid++; |
5b74c7b1 DG |
122 | } |
123 | ||
124 | /* | |
050349bb | 125 | * Delete a ltt_session structure to the global list. |
b5541356 | 126 | * |
050349bb | 127 | * The caller MUST acquire the session list lock before. |
5b74c7b1 DG |
128 | */ |
129 | static void del_session_list(struct ltt_session *ls) | |
130 | { | |
0525e9ae DG |
131 | assert(ls); |
132 | ||
5b74c7b1 | 133 | cds_list_del(&ls->list); |
5b74c7b1 DG |
134 | } |
135 | ||
b5541356 | 136 | /* |
050349bb | 137 | * Return a pointer to the session list. |
b5541356 | 138 | */ |
54d01ffb | 139 | struct ltt_session_list *session_get_list(void) |
b5541356 DG |
140 | { |
141 | return <t_session_list; | |
142 | } | |
143 | ||
6af972a2 JG |
144 | /* |
145 | * Returns once the session list is empty. | |
146 | */ | |
147 | void session_list_wait_empty(void) | |
148 | { | |
149 | pthread_mutex_lock(<t_session_list.lock); | |
150 | while (!cds_list_empty(<t_session_list.head)) { | |
151 | pthread_cond_wait(<t_session_list.removal_cond, | |
152 | <t_session_list.lock); | |
153 | } | |
154 | pthread_mutex_unlock(<t_session_list.lock); | |
155 | } | |
156 | ||
b5541356 | 157 | /* |
6c9cc2ab | 158 | * Acquire session list lock |
b5541356 | 159 | */ |
54d01ffb | 160 | void session_lock_list(void) |
b5541356 | 161 | { |
6c9cc2ab | 162 | pthread_mutex_lock(<t_session_list.lock); |
b5541356 DG |
163 | } |
164 | ||
71e0a100 JG |
165 | /* |
166 | * Try to acquire session list lock | |
167 | */ | |
168 | int session_trylock_list(void) | |
169 | { | |
170 | return pthread_mutex_trylock(<t_session_list.lock); | |
171 | } | |
172 | ||
b5541356 | 173 | /* |
6c9cc2ab | 174 | * Release session list lock |
b5541356 | 175 | */ |
54d01ffb | 176 | void session_unlock_list(void) |
b5541356 | 177 | { |
6c9cc2ab | 178 | pthread_mutex_unlock(<t_session_list.lock); |
b5541356 DG |
179 | } |
180 | ||
dd73d57b JG |
181 | /* |
182 | * Get the session's consumer destination type. | |
183 | * | |
184 | * The caller must hold the session lock. | |
185 | */ | |
186 | enum consumer_dst_type session_get_consumer_destination_type( | |
187 | const struct ltt_session *session) | |
188 | { | |
189 | /* | |
190 | * The output information is duplicated in both of those session types. | |
191 | * Hence, it doesn't matter from which it is retrieved. However, it is | |
192 | * possible for only one of them to be set. | |
193 | */ | |
194 | return session->kernel_session ? | |
195 | session->kernel_session->consumer->type : | |
196 | session->ust_session->consumer->type; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Get the session's consumer network hostname. | |
201 | * The caller must ensure that the destination is of type "net". | |
202 | * | |
203 | * The caller must hold the session lock. | |
204 | */ | |
205 | const char *session_get_net_consumer_hostname(const struct ltt_session *session) | |
206 | { | |
207 | const char *hostname = NULL; | |
208 | const struct consumer_output *output; | |
209 | ||
210 | output = session->kernel_session ? | |
211 | session->kernel_session->consumer : | |
212 | session->ust_session->consumer; | |
213 | ||
214 | /* | |
215 | * hostname is assumed to be the same for both control and data | |
216 | * connections. | |
217 | */ | |
218 | switch (output->dst.net.control.dtype) { | |
219 | case LTTNG_DST_IPV4: | |
220 | hostname = output->dst.net.control.dst.ipv4; | |
221 | break; | |
222 | case LTTNG_DST_IPV6: | |
223 | hostname = output->dst.net.control.dst.ipv6; | |
224 | break; | |
225 | default: | |
226 | abort(); | |
227 | } | |
228 | return hostname; | |
229 | } | |
230 | ||
231 | /* | |
232 | * Get the session's consumer network control and data ports. | |
233 | * The caller must ensure that the destination is of type "net". | |
234 | * | |
235 | * The caller must hold the session lock. | |
236 | */ | |
237 | void session_get_net_consumer_ports(const struct ltt_session *session, | |
238 | uint16_t *control_port, uint16_t *data_port) | |
239 | { | |
240 | const struct consumer_output *output; | |
241 | ||
242 | output = session->kernel_session ? | |
243 | session->kernel_session->consumer : | |
244 | session->ust_session->consumer; | |
245 | *control_port = output->dst.net.control.port; | |
246 | *data_port = output->dst.net.data.port; | |
247 | } | |
248 | ||
5d65beab JG |
249 | /* |
250 | * Get the location of the latest trace archive produced by a rotation. | |
251 | * | |
252 | * The caller must hold the session lock. | |
253 | */ | |
254 | struct lttng_trace_archive_location *session_get_trace_archive_location( | |
255 | struct ltt_session *session) | |
256 | { | |
257 | struct lttng_trace_archive_location *location = NULL; | |
258 | ||
259 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) { | |
260 | goto end; | |
261 | } | |
262 | ||
263 | switch (session_get_consumer_destination_type(session)) { | |
264 | case CONSUMER_DST_LOCAL: | |
265 | location = lttng_trace_archive_location_local_create( | |
266 | session->rotation_chunk.current_rotate_path); | |
267 | break; | |
268 | case CONSUMER_DST_NET: | |
269 | { | |
270 | const char *hostname; | |
271 | uint16_t control_port, data_port; | |
272 | ||
273 | hostname = session_get_net_consumer_hostname(session); | |
274 | session_get_net_consumer_ports(session, | |
275 | &control_port, | |
276 | &data_port); | |
277 | location = lttng_trace_archive_location_relay_create( | |
278 | hostname, | |
279 | LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP, | |
280 | control_port, data_port, | |
281 | session->rotation_chunk.current_rotate_path); | |
282 | break; | |
283 | } | |
284 | default: | |
285 | abort(); | |
286 | } | |
287 | end: | |
288 | return location; | |
289 | } | |
290 | ||
23324029 JD |
291 | /* |
292 | * Allocate the ltt_sessions_ht_by_id HT. | |
9c6518bc JG |
293 | * |
294 | * The session list lock must be held. | |
23324029 JD |
295 | */ |
296 | int ltt_sessions_ht_alloc(void) | |
297 | { | |
298 | int ret = 0; | |
299 | ||
300 | DBG("Allocating ltt_sessions_ht_by_id"); | |
301 | ltt_sessions_ht_by_id = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
302 | if (!ltt_sessions_ht_by_id) { | |
303 | ret = -1; | |
304 | ERR("Failed to allocate ltt_sessions_ht_by_id"); | |
305 | goto end; | |
306 | } | |
307 | end: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Destroy the ltt_sessions_ht_by_id HT. | |
9c6518bc JG |
313 | * |
314 | * The session list lock must be held. | |
23324029 | 315 | */ |
accdc9bf | 316 | static void ltt_sessions_ht_destroy(void) |
23324029 JD |
317 | { |
318 | if (!ltt_sessions_ht_by_id) { | |
319 | return; | |
320 | } | |
321 | ht_cleanup_push(ltt_sessions_ht_by_id); | |
322 | ltt_sessions_ht_by_id = NULL; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Add a ltt_session to the ltt_sessions_ht_by_id. | |
327 | * If unallocated, the ltt_sessions_ht_by_id HT is allocated. | |
328 | * The session list lock must be held. | |
329 | */ | |
330 | static void add_session_ht(struct ltt_session *ls) | |
331 | { | |
332 | int ret; | |
333 | ||
334 | assert(ls); | |
335 | ||
336 | if (!ltt_sessions_ht_by_id) { | |
337 | ret = ltt_sessions_ht_alloc(); | |
338 | if (ret) { | |
339 | ERR("Error allocating the sessions HT"); | |
340 | goto end; | |
341 | } | |
342 | } | |
343 | lttng_ht_node_init_u64(&ls->node, ls->id); | |
344 | lttng_ht_add_unique_u64(ltt_sessions_ht_by_id, &ls->node); | |
345 | ||
346 | end: | |
347 | return; | |
348 | } | |
349 | ||
350 | /* | |
351 | * Test if ltt_sessions_ht_by_id is empty. | |
352 | * Return 1 if empty, 0 if not empty. | |
353 | * The session list lock must be held. | |
354 | */ | |
def88971 | 355 | static int ltt_sessions_ht_empty(void) |
23324029 JD |
356 | { |
357 | int ret; | |
358 | ||
359 | if (!ltt_sessions_ht_by_id) { | |
360 | ret = 1; | |
361 | goto end; | |
362 | } | |
363 | ||
364 | ret = lttng_ht_get_count(ltt_sessions_ht_by_id) ? 0 : 1; | |
365 | end: | |
366 | return ret; | |
367 | } | |
368 | ||
369 | /* | |
370 | * Remove a ltt_session from the ltt_sessions_ht_by_id. | |
371 | * If empty, the ltt_sessions_ht_by_id HT is freed. | |
372 | * The session list lock must be held. | |
373 | */ | |
374 | static void del_session_ht(struct ltt_session *ls) | |
375 | { | |
376 | struct lttng_ht_iter iter; | |
377 | int ret; | |
378 | ||
379 | assert(ls); | |
380 | assert(ltt_sessions_ht_by_id); | |
381 | ||
382 | iter.iter.node = &ls->node.node; | |
383 | ret = lttng_ht_del(ltt_sessions_ht_by_id, &iter); | |
384 | assert(!ret); | |
385 | ||
386 | if (ltt_sessions_ht_empty()) { | |
387 | DBG("Empty ltt_sessions_ht_by_id, destroying it"); | |
388 | ltt_sessions_ht_destroy(); | |
389 | } | |
390 | } | |
391 | ||
b5541356 | 392 | /* |
6c9cc2ab | 393 | * Acquire session lock |
b5541356 | 394 | */ |
54d01ffb | 395 | void session_lock(struct ltt_session *session) |
b5541356 | 396 | { |
0525e9ae DG |
397 | assert(session); |
398 | ||
6c9cc2ab DG |
399 | pthread_mutex_lock(&session->lock); |
400 | } | |
b5541356 | 401 | |
6c9cc2ab DG |
402 | /* |
403 | * Release session lock | |
404 | */ | |
54d01ffb | 405 | void session_unlock(struct ltt_session *session) |
6c9cc2ab | 406 | { |
0525e9ae DG |
407 | assert(session); |
408 | ||
6c9cc2ab | 409 | pthread_mutex_unlock(&session->lock); |
b5541356 DG |
410 | } |
411 | ||
698fb2ed JG |
412 | static |
413 | int _session_set_trace_chunk_no_lock_check(struct ltt_session *session, | |
414 | struct lttng_trace_chunk *new_trace_chunk) | |
415 | { | |
416 | int ret; | |
417 | unsigned int i, refs_to_acquire = 0, refs_acquired = 0, refs_to_release = 0; | |
418 | unsigned int consumer_count = 0; | |
419 | /* | |
420 | * The maximum amount of consumers to reach is 3 | |
421 | * (32/64 userspace + kernel). | |
422 | */ | |
423 | struct consumer_create_chunk_transaction transactions[3] = {}; | |
424 | struct cds_lfht_iter iter; | |
425 | struct consumer_socket *socket; | |
426 | bool close_error_occured = false; | |
427 | ||
428 | if (new_trace_chunk) { | |
429 | uint64_t chunk_id; | |
430 | enum lttng_trace_chunk_status chunk_status = | |
431 | lttng_trace_chunk_get_id(new_trace_chunk, | |
432 | &chunk_id); | |
433 | ||
434 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
435 | LTTNG_OPTIONAL_SET(&session->last_trace_chunk_id, chunk_id) | |
436 | } | |
437 | ||
438 | if (new_trace_chunk) { | |
439 | refs_to_acquire = 1; | |
440 | refs_to_acquire += !!session->ust_session; | |
441 | refs_to_acquire += !!session->kernel_session; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Build a list of consumers to reach to announce the new trace chunk. | |
446 | * | |
447 | * Rolling back the annoucement in case of an error is important since | |
448 | * not doing so would result in a leak; the chunk will not be | |
449 | * "reclaimed" by the consumer(s) since they have no concept of the | |
450 | * lifetime of a session. | |
451 | */ | |
452 | if (session->ust_session) { | |
453 | cds_lfht_for_each_entry( | |
454 | session->ust_session->consumer->socks->ht, | |
455 | &iter, socket, node.node) { | |
456 | transactions[consumer_count].socket = socket; | |
457 | transactions[consumer_count].new_chunk = new_trace_chunk; | |
458 | transactions[consumer_count].previous_chunk = | |
459 | session->current_trace_chunk; | |
460 | consumer_count++; | |
461 | assert(consumer_count <= 3); | |
462 | } | |
463 | } | |
464 | if (session->kernel_session) { | |
465 | cds_lfht_for_each_entry( | |
466 | session->kernel_session->consumer->socks->ht, | |
467 | &iter, socket, node.node) { | |
468 | transactions[consumer_count].socket = socket; | |
469 | transactions[consumer_count].new_chunk = new_trace_chunk; | |
470 | transactions[consumer_count].previous_chunk = | |
471 | session->current_trace_chunk; | |
472 | consumer_count++; | |
473 | assert(consumer_count <= 3); | |
474 | } | |
475 | } | |
476 | for (refs_acquired = 0; refs_acquired < refs_to_acquire; refs_acquired++) { | |
477 | if (new_trace_chunk && !lttng_trace_chunk_get(new_trace_chunk)) { | |
478 | ERR("Failed to acquire reference to new current trace chunk of session \"%s\"", | |
479 | session->name); | |
480 | goto error; | |
481 | } | |
482 | } | |
483 | ||
484 | /* | |
485 | * Close the previous chunk on remote peers (consumers and relayd). | |
486 | */ | |
487 | for (i = 0; i < consumer_count; i++) { | |
488 | if (!transactions[i].previous_chunk) { | |
489 | continue; | |
490 | } | |
491 | pthread_mutex_lock(transactions[i].socket->lock); | |
492 | ret = consumer_close_trace_chunk(transactions[i].socket, | |
493 | session->consumer->net_seq_index, | |
494 | session->id, | |
495 | transactions[i].previous_chunk); | |
496 | pthread_mutex_unlock(transactions[i].socket->lock); | |
497 | if (ret) { | |
498 | ERR("Failed to close trace chunk on consumer"); | |
499 | close_error_occured = true; | |
500 | } | |
501 | } | |
502 | ||
503 | if (close_error_occured) { | |
504 | /* | |
505 | * Skip the creation of the new trace chunk and report the | |
506 | * error. | |
507 | */ | |
508 | goto error; | |
509 | } | |
510 | ||
511 | /* Create the new chunk on remote peers (consumers and relayd) */ | |
512 | if (new_trace_chunk) { | |
513 | for (i = 0; i < consumer_count; i++) { | |
514 | pthread_mutex_lock(transactions[i].socket->lock); | |
515 | ret = consumer_create_trace_chunk(transactions[i].socket, | |
516 | session->consumer->net_seq_index, | |
517 | session->id, | |
518 | transactions[i].new_chunk); | |
519 | pthread_mutex_unlock(transactions[i].socket->lock); | |
520 | if (ret) { | |
521 | ERR("Failed to create trace chunk on consumer"); | |
522 | goto error; | |
523 | } | |
524 | /* This will have to be rolled-back on error. */ | |
525 | transactions[i].new_chunk_created = true; | |
526 | } | |
527 | } | |
528 | ||
529 | lttng_trace_chunk_put(session->current_trace_chunk); | |
530 | session->current_trace_chunk = NULL; | |
531 | if (session->ust_session) { | |
532 | lttng_trace_chunk_put( | |
533 | session->ust_session->current_trace_chunk); | |
534 | session->ust_session->current_trace_chunk = NULL; | |
535 | } | |
536 | if (session->kernel_session) { | |
537 | lttng_trace_chunk_put( | |
538 | session->kernel_session->current_trace_chunk); | |
539 | session->kernel_session->current_trace_chunk = NULL; | |
540 | } | |
541 | ||
542 | /* | |
543 | * Update local current trace chunk state last, only if all remote | |
544 | * annoucements succeeded. | |
545 | */ | |
546 | session->current_trace_chunk = new_trace_chunk; | |
547 | if (session->ust_session) { | |
548 | session->ust_session->current_trace_chunk = new_trace_chunk; | |
549 | } | |
550 | if (session->kernel_session) { | |
551 | session->kernel_session->current_trace_chunk = | |
552 | new_trace_chunk; | |
553 | } | |
554 | ||
555 | return 0; | |
556 | error: | |
557 | /* | |
558 | * Release references taken in the case where all references could not | |
559 | * be acquired. | |
560 | */ | |
561 | refs_to_release = refs_to_acquire - refs_acquired; | |
562 | for (i = 0; i < refs_to_release; i++) { | |
563 | lttng_trace_chunk_put(new_trace_chunk); | |
564 | } | |
565 | ||
566 | /* | |
567 | * Close the newly-created chunk from remote peers (consumers and | |
568 | * relayd). | |
569 | */ | |
570 | DBG("Rolling back the creation of the new trace chunk on consumers"); | |
571 | for (i = 0; i < consumer_count; i++) { | |
572 | if (!transactions[i].new_chunk_created) { | |
573 | continue; | |
574 | } | |
575 | ||
576 | pthread_mutex_lock(transactions[i].socket->lock); | |
577 | ret = consumer_close_trace_chunk(transactions[i].socket, | |
578 | session->consumer->net_seq_index, | |
579 | session->id, | |
580 | transactions[i].new_chunk); | |
581 | pthread_mutex_unlock(transactions[i].socket->lock); | |
582 | if (ret) { | |
583 | ERR("Failed to close trace chunk on consumer"); | |
584 | close_error_occured = true; | |
585 | } | |
586 | } | |
587 | ||
588 | return -1; | |
589 | } | |
590 | ||
591 | static | |
592 | bool output_supports_chunks(const struct ltt_session *session) | |
593 | { | |
594 | if (session->consumer->type == CONSUMER_DST_LOCAL) { | |
595 | return true; | |
596 | } else { | |
597 | struct consumer_output *output; | |
598 | ||
599 | if (session->ust_session) { | |
600 | output = session->ust_session->consumer; | |
601 | } else if (session->kernel_session) { | |
602 | output = session->kernel_session->consumer; | |
603 | } else { | |
604 | abort(); | |
605 | } | |
606 | ||
607 | if (output->relay_major_version > 2) { | |
608 | return true; | |
609 | } else if (output->relay_major_version == 2 && | |
610 | output->relay_minor_version >= 11) { | |
611 | return true; | |
612 | } | |
613 | } | |
614 | return false; | |
615 | } | |
616 | ||
617 | enum lttng_error_code session_switch_trace_chunk(struct ltt_session *session, | |
618 | const char *session_base_path_override, | |
619 | const char *chunk_name_override) | |
620 | { | |
621 | int ret; | |
622 | enum lttng_error_code ret_code = LTTNG_OK; | |
623 | struct lttng_trace_chunk *trace_chunk = NULL; | |
624 | enum lttng_trace_chunk_status chunk_status; | |
625 | const time_t timestamp_begin = time(NULL); | |
626 | const bool is_local_trace = | |
627 | session->consumer->type == CONSUMER_DST_LOCAL; | |
628 | const char *base_path = session_base_path_override ? : | |
629 | session_get_base_path(session); | |
630 | struct lttng_directory_handle session_output_directory; | |
631 | const struct lttng_credentials session_credentials = { | |
632 | .uid = session->uid, | |
633 | .gid = session->gid, | |
634 | }; | |
635 | uint64_t next_chunk_id; | |
636 | ||
637 | if (timestamp_begin == (time_t) -1) { | |
638 | PERROR("Failed to sample time while changing session \"%s\" trace chunk", | |
639 | session->name); | |
640 | ret_code = LTTNG_ERR_FATAL; | |
641 | goto error; | |
642 | } | |
643 | session->current_chunk_start_ts = timestamp_begin; | |
644 | ||
645 | if (!output_supports_chunks(session)) { | |
646 | goto end; | |
647 | } | |
648 | next_chunk_id = session->last_trace_chunk_id.is_set ? | |
649 | session->last_trace_chunk_id.value + 1 : 0; | |
650 | ||
651 | trace_chunk = lttng_trace_chunk_create(next_chunk_id, timestamp_begin); | |
652 | if (!trace_chunk) { | |
653 | ret_code = LTTNG_ERR_FATAL; | |
654 | goto error; | |
655 | } | |
656 | ||
657 | if (chunk_name_override) { | |
658 | chunk_status = lttng_trace_chunk_override_name(trace_chunk, | |
659 | chunk_name_override); | |
660 | switch (chunk_status) { | |
661 | case LTTNG_TRACE_CHUNK_STATUS_OK: | |
662 | break; | |
663 | case LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT: | |
664 | ret_code = LTTNG_ERR_INVALID; | |
665 | goto error; | |
666 | default: | |
667 | ret_code = LTTNG_ERR_NOMEM; | |
668 | goto error; | |
669 | } | |
670 | } | |
671 | ||
672 | if (!is_local_trace) { | |
673 | /* | |
674 | * No need to set crendentials and output directory | |
675 | * for remote trace chunks. | |
676 | */ | |
677 | goto publish; | |
678 | } | |
679 | ||
680 | chunk_status = lttng_trace_chunk_set_credentials(trace_chunk, | |
681 | &session_credentials); | |
682 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
683 | ret_code = LTTNG_ERR_FATAL; | |
684 | goto error; | |
685 | } | |
686 | ||
687 | if (!session->current_trace_chunk) { | |
688 | DBG("Creating base output directory of session \"%s\" at %s", | |
689 | session->name, base_path); | |
690 | } | |
691 | ret = utils_mkdir_recursive(base_path, S_IRWXU | S_IRWXG, | |
692 | session->uid, session->gid); | |
693 | if (ret) { | |
694 | ret = LTTNG_ERR_FATAL; | |
695 | goto error; | |
696 | } | |
697 | ret = lttng_directory_handle_init(&session_output_directory, | |
698 | base_path); | |
699 | if (ret) { | |
700 | ret = LTTNG_ERR_FATAL; | |
701 | goto error; | |
702 | } | |
703 | chunk_status = lttng_trace_chunk_set_as_owner(trace_chunk, | |
704 | &session_output_directory); | |
705 | lttng_directory_handle_fini(&session_output_directory); | |
706 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
707 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
708 | goto error; | |
709 | } | |
710 | publish: | |
711 | ret = session_set_trace_chunk(session, trace_chunk); | |
712 | if (ret) { | |
713 | ret_code = LTTNG_ERR_FATAL; | |
714 | goto error; | |
715 | } | |
716 | error: | |
717 | lttng_trace_chunk_put(trace_chunk); | |
718 | end: | |
719 | return ret_code; | |
720 | } | |
721 | ||
722 | /* | |
723 | * Set a session's current trace chunk. | |
724 | * | |
725 | * Must be called with the session lock held. | |
726 | */ | |
727 | int session_set_trace_chunk(struct ltt_session *session, | |
728 | struct lttng_trace_chunk *new_trace_chunk) | |
729 | { | |
730 | ASSERT_LOCKED(session->lock); | |
731 | return _session_set_trace_chunk_no_lock_check(session, new_trace_chunk); | |
732 | } | |
733 | ||
48a86f68 JG |
734 | static |
735 | void session_release(struct urcu_ref *ref) | |
736 | { | |
737 | int ret; | |
738 | struct ltt_ust_session *usess; | |
739 | struct ltt_kernel_session *ksess; | |
740 | struct ltt_session *session = container_of(ref, typeof(*session), ref); | |
741 | ||
742 | usess = session->ust_session; | |
743 | ksess = session->kernel_session; | |
698fb2ed | 744 | (void) _session_set_trace_chunk_no_lock_check(session, NULL); |
48a86f68 JG |
745 | |
746 | /* Clean kernel session teardown */ | |
747 | kernel_destroy_session(ksess); | |
698fb2ed | 748 | session->kernel_session = NULL; |
48a86f68 JG |
749 | |
750 | /* UST session teardown */ | |
751 | if (usess) { | |
752 | /* Close any relayd session */ | |
753 | consumer_output_send_destroy_relayd(usess->consumer); | |
754 | ||
755 | /* Destroy every UST application related to this session. */ | |
756 | ret = ust_app_destroy_trace_all(usess); | |
757 | if (ret) { | |
758 | ERR("Error in ust_app_destroy_trace_all"); | |
759 | } | |
760 | ||
761 | /* Clean up the rest. */ | |
762 | trace_ust_destroy_session(usess); | |
698fb2ed | 763 | session->ust_session = NULL; |
48a86f68 JG |
764 | } |
765 | ||
766 | /* | |
767 | * Must notify the kernel thread here to update it's poll set in order to | |
768 | * remove the channel(s)' fd just destroyed. | |
769 | */ | |
770 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
771 | if (ret < 0) { | |
772 | PERROR("write kernel poll pipe"); | |
773 | } | |
774 | ||
775 | DBG("Destroying session %s (id %" PRIu64 ")", session->name, session->id); | |
48a86f68 JG |
776 | |
777 | consumer_output_put(session->consumer); | |
778 | snapshot_destroy(&session->snapshot); | |
6af972a2 | 779 | |
698fb2ed JG |
780 | pthread_mutex_destroy(&session->lock); |
781 | ||
56ca63c0 JG |
782 | if (session->published) { |
783 | ASSERT_LOCKED(ltt_session_list.lock); | |
784 | del_session_list(session); | |
785 | del_session_ht(session); | |
786 | pthread_cond_broadcast(<t_session_list.removal_cond); | |
787 | } | |
48a86f68 JG |
788 | free(session); |
789 | } | |
790 | ||
791 | /* | |
792 | * Acquire a reference to a session. | |
793 | * This function may fail (return false); its return value must be checked. | |
794 | */ | |
795 | bool session_get(struct ltt_session *session) | |
796 | { | |
797 | return urcu_ref_get_unless_zero(&session->ref); | |
798 | } | |
799 | ||
800 | /* | |
801 | * Release a reference to a session. | |
802 | */ | |
803 | void session_put(struct ltt_session *session) | |
804 | { | |
5feee503 JG |
805 | if (!session) { |
806 | return; | |
807 | } | |
48a86f68 JG |
808 | /* |
809 | * The session list lock must be held as any session_put() | |
810 | * may cause the removal of the session from the session_list. | |
811 | */ | |
812 | ASSERT_LOCKED(ltt_session_list.lock); | |
813 | assert(session->ref.refcount); | |
814 | urcu_ref_put(&session->ref, session_release); | |
815 | } | |
816 | ||
817 | /* | |
818 | * Destroy a session. | |
819 | * | |
820 | * This method does not immediately release/free the session as other | |
821 | * components may still hold a reference to the session. However, | |
822 | * the session should no longer be presented to the user. | |
823 | * | |
824 | * Releases the session list's reference to the session | |
825 | * and marks it as destroyed. Iterations on the session list should be | |
826 | * mindful of the "destroyed" flag. | |
827 | */ | |
828 | void session_destroy(struct ltt_session *session) | |
829 | { | |
830 | assert(!session->destroyed); | |
831 | session->destroyed = true; | |
832 | session_put(session); | |
833 | } | |
834 | ||
5b74c7b1 | 835 | /* |
74babd95 | 836 | * Return a ltt_session structure ptr that matches name. If no session found, |
23324029 | 837 | * NULL is returned. This must be called with the session list lock held using |
74babd95 | 838 | * session_lock_list and session_unlock_list. |
48a86f68 | 839 | * A reference to the session is implicitly acquired by this function. |
5b74c7b1 | 840 | */ |
58a1a227 | 841 | struct ltt_session *session_find_by_name(const char *name) |
5b74c7b1 | 842 | { |
5b74c7b1 DG |
843 | struct ltt_session *iter; |
844 | ||
0525e9ae | 845 | assert(name); |
48a86f68 | 846 | ASSERT_LOCKED(ltt_session_list.lock); |
0525e9ae | 847 | |
5f822d0a DG |
848 | DBG2("Trying to find session by name %s", name); |
849 | ||
5b74c7b1 | 850 | cds_list_for_each_entry(iter, <t_session_list.head, list) { |
48a86f68 JG |
851 | if (!strncmp(iter->name, name, NAME_MAX) && |
852 | !iter->destroyed) { | |
74babd95 | 853 | goto found; |
5b74c7b1 DG |
854 | } |
855 | } | |
856 | ||
48a86f68 | 857 | return NULL; |
74babd95 | 858 | found: |
48a86f68 | 859 | return session_get(iter) ? iter : NULL; |
5b74c7b1 DG |
860 | } |
861 | ||
23324029 JD |
862 | /* |
863 | * Return an ltt_session that matches the id. If no session is found, | |
864 | * NULL is returned. This must be called with rcu_read_lock and | |
865 | * session list lock held (to guarantee the lifetime of the session). | |
866 | */ | |
867 | struct ltt_session *session_find_by_id(uint64_t id) | |
868 | { | |
869 | struct lttng_ht_node_u64 *node; | |
870 | struct lttng_ht_iter iter; | |
871 | struct ltt_session *ls; | |
872 | ||
48a86f68 JG |
873 | ASSERT_LOCKED(ltt_session_list.lock); |
874 | ||
d68ec974 JG |
875 | if (!ltt_sessions_ht_by_id) { |
876 | goto end; | |
877 | } | |
878 | ||
23324029 JD |
879 | lttng_ht_lookup(ltt_sessions_ht_by_id, &id, &iter); |
880 | node = lttng_ht_iter_get_node_u64(&iter); | |
881 | if (node == NULL) { | |
d68ec974 | 882 | goto end; |
23324029 JD |
883 | } |
884 | ls = caa_container_of(node, struct ltt_session, node); | |
885 | ||
886 | DBG3("Session %" PRIu64 " found by id.", id); | |
48a86f68 | 887 | return session_get(ls) ? ls : NULL; |
23324029 | 888 | |
d68ec974 | 889 | end: |
23324029 JD |
890 | DBG3("Session %" PRIu64 " NOT found by id", id); |
891 | return NULL; | |
892 | } | |
893 | ||
5b74c7b1 | 894 | /* |
5feee503 JG |
895 | * Create a new session and add it to the session list. |
896 | * Session list lock must be held by the caller. | |
5b74c7b1 | 897 | */ |
5feee503 JG |
898 | enum lttng_error_code session_create(const char *name, uid_t uid, gid_t gid, |
899 | struct ltt_session **out_session) | |
5b74c7b1 | 900 | { |
f3ed775e | 901 | int ret; |
5feee503 JG |
902 | enum lttng_error_code ret_code; |
903 | struct ltt_session *new_session = NULL; | |
e07ae692 | 904 | |
5feee503 JG |
905 | ASSERT_LOCKED(ltt_session_list.lock); |
906 | if (name) { | |
907 | struct ltt_session *clashing_session; | |
908 | ||
909 | clashing_session = session_find_by_name(name); | |
910 | if (clashing_session) { | |
911 | session_put(clashing_session); | |
912 | ret_code = LTTNG_ERR_EXIST_SESS; | |
913 | goto error; | |
914 | } | |
915 | } | |
ba7f0ae5 | 916 | new_session = zmalloc(sizeof(struct ltt_session)); |
5feee503 JG |
917 | if (!new_session) { |
918 | PERROR("Failed to allocate an ltt_session structure"); | |
919 | ret_code = LTTNG_ERR_NOMEM; | |
920 | goto error; | |
5b74c7b1 DG |
921 | } |
922 | ||
48a86f68 | 923 | urcu_ref_init(&new_session->ref); |
5feee503 | 924 | pthread_mutex_init(&new_session->lock, NULL); |
48a86f68 | 925 | |
5feee503 JG |
926 | new_session->creation_time = time(NULL); |
927 | if (new_session->creation_time == (time_t) -1) { | |
928 | PERROR("Failed to sample session creation time"); | |
929 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
f3ed775e DG |
930 | goto error; |
931 | } | |
932 | ||
5feee503 JG |
933 | /* Create default consumer output. */ |
934 | new_session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
935 | if (new_session->consumer == NULL) { | |
936 | ret_code = LTTNG_ERR_NOMEM; | |
1c1c3634 DG |
937 | goto error; |
938 | } | |
939 | ||
5feee503 JG |
940 | if (name) { |
941 | ret = lttng_strncpy(new_session->name, name, sizeof(new_session->name)); | |
942 | if (ret) { | |
943 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
944 | goto error; | |
945 | } | |
946 | ret = validate_name(name); | |
947 | if (ret < 0) { | |
948 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
949 | goto error; | |
950 | } | |
951 | } else { | |
952 | int i = 0; | |
953 | bool found_name = false; | |
954 | char datetime[16]; | |
955 | struct tm *timeinfo; | |
956 | ||
957 | timeinfo = localtime(&new_session->creation_time); | |
958 | if (!timeinfo) { | |
959 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
960 | goto error; | |
961 | } | |
962 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
963 | for (i = 0; i < INT_MAX; i++) { | |
964 | struct ltt_session *clashing_session; | |
965 | ||
966 | if (i == 0) { | |
967 | ret = snprintf(new_session->name, | |
968 | sizeof(new_session->name), | |
969 | "%s-%s", | |
970 | DEFAULT_SESSION_NAME, | |
971 | datetime); | |
972 | } else { | |
973 | ret = snprintf(new_session->name, | |
974 | sizeof(new_session->name), | |
975 | "%s%d-%s", | |
976 | DEFAULT_SESSION_NAME, i, | |
977 | datetime); | |
978 | } | |
979 | if (ret == -1 || ret >= sizeof(new_session->name)) { | |
980 | /* | |
981 | * Null-terminate in case the name is used | |
982 | * in logging statements. | |
983 | */ | |
984 | new_session->name[sizeof(new_session->name) - 1] = '\0'; | |
985 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
986 | goto error; | |
987 | } | |
988 | ||
989 | clashing_session = | |
990 | session_find_by_name(new_session->name); | |
991 | session_put(clashing_session); | |
992 | if (!clashing_session) { | |
993 | found_name = true; | |
994 | break; | |
995 | } | |
996 | } | |
997 | if (found_name) { | |
998 | DBG("Generated session name \"%s\"", new_session->name); | |
999 | new_session->has_auto_generated_name = true; | |
1000 | } else { | |
1001 | ERR("Failed to auto-generate a session name"); | |
1002 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1003 | goto error; | |
1004 | } | |
1005 | } | |
1006 | ||
d3e2ba59 | 1007 | ret = gethostname(new_session->hostname, sizeof(new_session->hostname)); |
73184835 DG |
1008 | if (ret < 0) { |
1009 | if (errno == ENAMETOOLONG) { | |
1010 | new_session->hostname[sizeof(new_session->hostname) - 1] = '\0'; | |
5feee503 JG |
1011 | ERR("Hostname exceeds the maximal permitted length and has been truncated to %s", |
1012 | new_session->hostname); | |
73184835 | 1013 | } else { |
5feee503 | 1014 | ret_code = LTTNG_ERR_SESSION_FAIL; |
73184835 DG |
1015 | goto error; |
1016 | } | |
d3e2ba59 JD |
1017 | } |
1018 | ||
6df2e2c9 MD |
1019 | new_session->uid = uid; |
1020 | new_session->gid = gid; | |
1021 | ||
6dc3064a DG |
1022 | ret = snapshot_init(&new_session->snapshot); |
1023 | if (ret < 0) { | |
5feee503 | 1024 | ret_code = LTTNG_ERR_NOMEM; |
6dc3064a DG |
1025 | goto error; |
1026 | } | |
1027 | ||
4f23c583 | 1028 | new_session->rotation_state = LTTNG_ROTATION_STATE_NO_ROTATION; |
82528808 | 1029 | |
5feee503 | 1030 | /* Add new session to the session list. */ |
a991f516 | 1031 | new_session->id = add_session_list(new_session); |
5feee503 | 1032 | |
23324029 JD |
1033 | /* |
1034 | * Add the new session to the ltt_sessions_ht_by_id. | |
1035 | * No ownership is taken by the hash table; it is merely | |
1036 | * a wrapper around the session list used for faster access | |
1037 | * by session id. | |
1038 | */ | |
1039 | add_session_ht(new_session); | |
56ca63c0 | 1040 | new_session->published = true; |
b5541356 | 1041 | |
a4b92340 | 1042 | /* |
5feee503 JG |
1043 | * Consumer is left to NULL since the create_session_uri command will |
1044 | * set it up and, if valid, assign it to the session. | |
a4b92340 | 1045 | */ |
5feee503 JG |
1046 | DBG("Tracing session %s created with ID %" PRIu64 " by uid = %d, gid = %d", |
1047 | new_session->name, new_session->id, new_session->uid, | |
1048 | new_session->gid); | |
1049 | ret_code = LTTNG_OK; | |
1050 | end: | |
1051 | if (new_session) { | |
1052 | (void) session_get(new_session); | |
1053 | *out_session = new_session; | |
1054 | } | |
1055 | return ret_code; | |
5b74c7b1 | 1056 | error: |
56ca63c0 | 1057 | session_put(new_session); |
5feee503 JG |
1058 | new_session = NULL; |
1059 | goto end; | |
5b74c7b1 | 1060 | } |
2f77fc4b DG |
1061 | |
1062 | /* | |
1063 | * Check if the UID or GID match the session. Root user has access to all | |
1064 | * sessions. | |
1065 | */ | |
1066 | int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) | |
1067 | { | |
1068 | assert(session); | |
1069 | ||
1070 | if (uid != session->uid && gid != session->gid && uid != 0) { | |
1071 | return 0; | |
1072 | } else { | |
1073 | return 1; | |
1074 | } | |
1075 | } | |
d70d3b5f JG |
1076 | |
1077 | /* | |
1078 | * Set a session's rotation state and reset all associated state. | |
1079 | * | |
1080 | * This function resets the rotation state (check timers, pending | |
1081 | * flags, etc.) and sets the result of the last rotation. The result | |
1082 | * can be queries by a liblttng-ctl client. | |
1083 | * | |
1084 | * Be careful of the result passed to this function. For instance, | |
1085 | * on failure to launch a rotation, a client will expect the rotation | |
1086 | * state to be set to "NO_ROTATION". If an error occured while the | |
1087 | * rotation was "ONGOING", result should be set to "ERROR", which will | |
1088 | * allow a client to report it. | |
1089 | * | |
1090 | * Must be called with the session and session_list locks held. | |
1091 | */ | |
1092 | int session_reset_rotation_state(struct ltt_session *session, | |
1093 | enum lttng_rotation_state result) | |
1094 | { | |
1095 | int ret = 0; | |
1096 | ||
1097 | ASSERT_LOCKED(ltt_session_list.lock); | |
1098 | ASSERT_LOCKED(session->lock); | |
1099 | ||
1100 | session->rotation_pending_local = false; | |
1101 | session->rotation_pending_relay = false; | |
1102 | session->rotated_after_last_stop = false; | |
1103 | session->rotation_state = result; | |
1104 | if (session->rotation_pending_check_timer_enabled) { | |
1105 | ret = timer_session_rotation_pending_check_stop(session); | |
1106 | } | |
1107 | return ret; | |
1108 | } |