Commit | Line | Data |
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ab0ee2ca | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
ab0ee2ca | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
ab0ee2ca | 5 | * |
ab0ee2ca JG |
6 | */ |
7 | ||
f2b3ef9f JG |
8 | #include "lttng/action/action.h" |
9 | #include "lttng/trigger/trigger-internal.h" | |
ab0ee2ca JG |
10 | #define _LGPL_SOURCE |
11 | #include <urcu.h> | |
12 | #include <urcu/rculfhash.h> | |
13 | ||
ab0ee2ca JG |
14 | #include <common/defaults.h> |
15 | #include <common/error.h> | |
16 | #include <common/futex.h> | |
17 | #include <common/unix.h> | |
18 | #include <common/dynamic-buffer.h> | |
19 | #include <common/hashtable/utils.h> | |
20 | #include <common/sessiond-comm/sessiond-comm.h> | |
21 | #include <common/macros.h> | |
22 | #include <lttng/condition/condition.h> | |
9b63a4aa | 23 | #include <lttng/action/action-internal.h> |
ad63a966 | 24 | #include <lttng/action/list-internal.h> |
93ac2c44 | 25 | #include <lttng/domain-internal.h> |
ab0ee2ca JG |
26 | #include <lttng/notification/notification-internal.h> |
27 | #include <lttng/condition/condition-internal.h> | |
28 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 29 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 30 | #include <lttng/condition/session-rotation-internal.h> |
670a26e4 | 31 | #include <lttng/condition/event-rule-matches-internal.h> |
d02d7404 | 32 | #include <lttng/domain-internal.h> |
ab0ee2ca | 33 | #include <lttng/notification/channel-internal.h> |
85c06c44 | 34 | #include <lttng/trigger/trigger-internal.h> |
959e3c66 | 35 | #include <lttng/event-rule/event-rule-internal.h> |
1da26331 | 36 | |
ab0ee2ca JG |
37 | #include <time.h> |
38 | #include <unistd.h> | |
39 | #include <assert.h> | |
40 | #include <inttypes.h> | |
d53ea4e4 | 41 | #include <fcntl.h> |
ab0ee2ca | 42 | |
e98a976a | 43 | #include "condition-internal.h" |
90aa04a1 | 44 | #include "event-notifier-error-accounting.h" |
1da26331 JG |
45 | #include "notification-thread.h" |
46 | #include "notification-thread-events.h" | |
47 | #include "notification-thread-commands.h" | |
48 | #include "lttng-sessiond.h" | |
49 | #include "kernel.h" | |
50 | ||
ab0ee2ca JG |
51 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
52 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
53 | ||
82b3cbf4 JR |
54 | /* The tracers currently limit the capture size to PIPE_BUF (4kb on linux). */ |
55 | #define MAX_CAPTURE_SIZE (PIPE_BUF) | |
56 | ||
51eab943 JG |
57 | enum lttng_object_type { |
58 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
59 | LTTNG_OBJECT_TYPE_NONE, | |
60 | LTTNG_OBJECT_TYPE_CHANNEL, | |
61 | LTTNG_OBJECT_TYPE_SESSION, | |
62 | }; | |
63 | ||
ab0ee2ca | 64 | struct lttng_trigger_list_element { |
9e0bb80e | 65 | /* No ownership of the trigger object is assumed. */ |
f2b3ef9f | 66 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
67 | struct cds_list_head node; |
68 | }; | |
69 | ||
70 | struct lttng_channel_trigger_list { | |
71 | struct channel_key channel_key; | |
ea9a44f0 | 72 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 73 | struct cds_list_head list; |
ea9a44f0 | 74 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 75 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
76 | /* call_rcu delayed reclaim. */ |
77 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
78 | }; |
79 | ||
ea9a44f0 JG |
80 | /* |
81 | * List of triggers applying to a given session. | |
82 | * | |
83 | * See: | |
84 | * - lttng_session_trigger_list_create() | |
85 | * - lttng_session_trigger_list_build() | |
86 | * - lttng_session_trigger_list_destroy() | |
87 | * - lttng_session_trigger_list_add() | |
88 | */ | |
89 | struct lttng_session_trigger_list { | |
90 | /* | |
91 | * Not owned by this; points to the session_info structure's | |
92 | * session name. | |
93 | */ | |
94 | const char *session_name; | |
95 | /* List of struct lttng_trigger_list_element. */ | |
96 | struct cds_list_head list; | |
97 | /* Node in the session_triggers_ht */ | |
98 | struct cds_lfht_node session_triggers_ht_node; | |
99 | /* | |
100 | * Weak reference to the notification system's session triggers | |
101 | * hashtable. | |
102 | * | |
103 | * The session trigger list structure structure is owned by | |
104 | * the session's session_info. | |
105 | * | |
106 | * The session_info is kept alive the the channel_infos holding a | |
107 | * reference to it (reference counting). When those channels are | |
108 | * destroyed (at runtime or on teardown), the reference they hold | |
109 | * to the session_info are released. On destruction of session_info, | |
110 | * session_info_destroy() will remove the list of triggers applying | |
111 | * to this session from the notification system's state. | |
112 | * | |
113 | * This implies that the session_triggers_ht must be destroyed | |
114 | * after the channels. | |
115 | */ | |
116 | struct cds_lfht *session_triggers_ht; | |
117 | /* Used for delayed RCU reclaim. */ | |
118 | struct rcu_head rcu_node; | |
119 | }; | |
120 | ||
ab0ee2ca JG |
121 | struct lttng_trigger_ht_element { |
122 | struct lttng_trigger *trigger; | |
123 | struct cds_lfht_node node; | |
242388e4 | 124 | struct cds_lfht_node node_by_name_uid; |
091fa780 | 125 | struct cds_list_head client_list_trigger_node; |
83b934ad MD |
126 | /* call_rcu delayed reclaim. */ |
127 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
128 | }; |
129 | ||
130 | struct lttng_condition_list_element { | |
131 | struct lttng_condition *condition; | |
132 | struct cds_list_head node; | |
133 | }; | |
134 | ||
ab0ee2ca JG |
135 | struct channel_state_sample { |
136 | struct channel_key key; | |
137 | struct cds_lfht_node channel_state_ht_node; | |
138 | uint64_t highest_usage; | |
139 | uint64_t lowest_usage; | |
e8360425 | 140 | uint64_t channel_total_consumed; |
83b934ad MD |
141 | /* call_rcu delayed reclaim. */ |
142 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
143 | }; |
144 | ||
e4db5ace | 145 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 146 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 147 | struct lttng_evaluation **evaluation, |
e8360425 JD |
148 | const struct notification_thread_state *state, |
149 | const struct channel_state_sample *previous_sample, | |
150 | const struct channel_state_sample *latest_sample, | |
151 | uint64_t previous_session_consumed_total, | |
152 | uint64_t latest_session_consumed_total, | |
153 | struct channel_info *channel_info); | |
e4db5ace | 154 | static |
9b63a4aa JG |
155 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
156 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
157 | struct notification_client_list *client_list, |
158 | struct notification_thread_state *state, | |
159 | uid_t channel_uid, gid_t channel_gid); | |
160 | ||
8abe313a | 161 | |
ea9a44f0 | 162 | /* session_info API */ |
8abe313a JG |
163 | static |
164 | void session_info_destroy(void *_data); | |
165 | static | |
166 | void session_info_get(struct session_info *session_info); | |
167 | static | |
168 | void session_info_put(struct session_info *session_info); | |
169 | static | |
170 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 171 | uid_t uid, gid_t gid, |
1eee26c5 JG |
172 | struct lttng_session_trigger_list *trigger_list, |
173 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
174 | static |
175 | void session_info_add_channel(struct session_info *session_info, | |
176 | struct channel_info *channel_info); | |
177 | static | |
178 | void session_info_remove_channel(struct session_info *session_info, | |
179 | struct channel_info *channel_info); | |
180 | ||
ea9a44f0 JG |
181 | /* lttng_session_trigger_list API */ |
182 | static | |
183 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
184 | const char *session_name, | |
185 | struct cds_lfht *session_triggers_ht); | |
186 | static | |
187 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
188 | const struct notification_thread_state *state, | |
189 | const char *session_name); | |
190 | static | |
191 | void lttng_session_trigger_list_destroy( | |
192 | struct lttng_session_trigger_list *list); | |
193 | static | |
194 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 195 | struct lttng_trigger *trigger); |
ea9a44f0 | 196 | |
f2b3ef9f JG |
197 | static |
198 | int client_handle_transmission_status( | |
199 | struct notification_client *client, | |
200 | enum client_transmission_status transmission_status, | |
201 | struct notification_thread_state *state); | |
ea9a44f0 | 202 | |
8b524060 FD |
203 | static |
204 | int handle_one_event_notifier_notification( | |
205 | struct notification_thread_state *state, | |
206 | int pipe, enum lttng_domain_type domain); | |
207 | ||
242388e4 JR |
208 | static |
209 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node); | |
210 | ||
ab0ee2ca | 211 | static |
ac1889bf | 212 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
213 | { |
214 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
215 | const int socket = (int) (intptr_t) key; |
216 | const struct notification_client *client = caa_container_of(node, | |
217 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 218 | |
ac1889bf JG |
219 | return client->socket == socket; |
220 | } | |
221 | ||
222 | static | |
223 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
224 | { | |
225 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
226 | const notification_client_id id = *((notification_client_id *) key); | |
227 | const struct notification_client *client = caa_container_of( | |
228 | node, struct notification_client, client_id_ht_node); | |
ab0ee2ca | 229 | |
ac1889bf | 230 | return client->id == id; |
ab0ee2ca JG |
231 | } |
232 | ||
233 | static | |
234 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
235 | { | |
236 | struct channel_key *channel_key = (struct channel_key *) key; | |
237 | struct lttng_channel_trigger_list *trigger_list; | |
238 | ||
239 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
240 | channel_triggers_ht_node); | |
241 | ||
242 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
243 | (channel_key->domain == trigger_list->channel_key.domain)); | |
244 | } | |
245 | ||
51eab943 JG |
246 | static |
247 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
248 | { | |
249 | const char *session_name = (const char *) key; | |
250 | struct lttng_session_trigger_list *trigger_list; | |
251 | ||
252 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
253 | session_triggers_ht_node); | |
254 | ||
255 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
256 | } | |
257 | ||
ab0ee2ca JG |
258 | static |
259 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
260 | { | |
261 | struct channel_key *channel_key = (struct channel_key *) key; | |
262 | struct channel_state_sample *sample; | |
263 | ||
264 | sample = caa_container_of(node, struct channel_state_sample, | |
265 | channel_state_ht_node); | |
266 | ||
267 | return !!((channel_key->key == sample->key.key) && | |
268 | (channel_key->domain == sample->key.domain)); | |
269 | } | |
270 | ||
271 | static | |
272 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
273 | { | |
274 | struct channel_key *channel_key = (struct channel_key *) key; | |
275 | struct channel_info *channel_info; | |
276 | ||
277 | channel_info = caa_container_of(node, struct channel_info, | |
278 | channels_ht_node); | |
279 | ||
280 | return !!((channel_key->key == channel_info->key.key) && | |
281 | (channel_key->domain == channel_info->key.domain)); | |
282 | } | |
283 | ||
284 | static | |
242388e4 | 285 | int match_trigger(struct cds_lfht_node *node, const void *key) |
ab0ee2ca | 286 | { |
242388e4 JR |
287 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; |
288 | struct lttng_trigger_ht_element *trigger_ht_element; | |
ab0ee2ca | 289 | |
242388e4 | 290 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, |
ab0ee2ca | 291 | node); |
ab0ee2ca | 292 | |
242388e4 | 293 | return !!lttng_trigger_is_equal(trigger_key, trigger_ht_element->trigger); |
ab0ee2ca JG |
294 | } |
295 | ||
e7c93cf9 JR |
296 | static |
297 | int match_trigger_token(struct cds_lfht_node *node, const void *key) | |
298 | { | |
299 | const uint64_t *_key = key; | |
300 | struct notification_trigger_tokens_ht_element *element; | |
301 | ||
302 | element = caa_container_of(node, | |
303 | struct notification_trigger_tokens_ht_element, node); | |
304 | return *_key == element->token; | |
305 | } | |
306 | ||
ab0ee2ca JG |
307 | static |
308 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
309 | { | |
310 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
311 | struct notification_client_list *client_list; | |
f82f93a1 | 312 | const struct lttng_condition *condition; |
ab0ee2ca JG |
313 | |
314 | assert(condition_key); | |
315 | ||
316 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 317 | notification_trigger_clients_ht_node); |
091fa780 | 318 | condition = client_list->condition; |
ab0ee2ca JG |
319 | |
320 | return !!lttng_condition_is_equal(condition_key, condition); | |
321 | } | |
322 | ||
f82f93a1 JG |
323 | static |
324 | int match_session(struct cds_lfht_node *node, const void *key) | |
325 | { | |
326 | const char *name = key; | |
327 | struct session_info *session_info = caa_container_of( | |
328 | node, struct session_info, sessions_ht_node); | |
329 | ||
330 | return !strcmp(session_info->name, name); | |
331 | } | |
332 | ||
6900ae81 FD |
333 | static |
334 | const char *notification_command_type_str( | |
335 | enum notification_thread_command_type type) | |
336 | { | |
337 | switch (type) { | |
338 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
339 | return "REGISTER_TRIGGER"; | |
340 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
341 | return "UNREGISTER_TRIGGER"; | |
342 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
343 | return "ADD_CHANNEL"; | |
344 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
345 | return "REMOVE_CHANNEL"; | |
346 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: | |
347 | return "SESSION_ROTATION_ONGOING"; | |
348 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: | |
349 | return "SESSION_ROTATION_COMPLETED"; | |
350 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: | |
351 | return "ADD_TRACER_EVENT_SOURCE"; | |
352 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
353 | return "REMOVE_TRACER_EVENT_SOURCE"; | |
354 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: | |
355 | return "LIST_TRIGGERS"; | |
8790759c FD |
356 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
357 | return "GET_TRIGGER"; | |
6900ae81 FD |
358 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
359 | return "QUIT"; | |
360 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: | |
361 | return "CLIENT_COMMUNICATION_UPDATE"; | |
362 | default: | |
363 | abort(); | |
364 | } | |
365 | } | |
366 | ||
242388e4 JR |
367 | /* |
368 | * Match trigger based on name and credentials only. | |
369 | * Name duplication is NOT allowed for the same uid. | |
370 | */ | |
371 | static | |
372 | int match_trigger_by_name_uid(struct cds_lfht_node *node, | |
373 | const void *key) | |
374 | { | |
375 | bool match = false; | |
0efb2ad7 | 376 | const char *element_trigger_name; |
242388e4 JR |
377 | const char *key_name; |
378 | enum lttng_trigger_status status; | |
379 | const struct lttng_credentials *key_creds; | |
380 | const struct lttng_credentials *node_creds; | |
381 | const struct lttng_trigger *trigger_key = | |
382 | (const struct lttng_trigger *) key; | |
383 | const struct lttng_trigger_ht_element *trigger_ht_element = | |
384 | caa_container_of(node, | |
385 | struct lttng_trigger_ht_element, | |
386 | node_by_name_uid); | |
387 | ||
0efb2ad7 JG |
388 | status = lttng_trigger_get_name(trigger_ht_element->trigger, |
389 | &element_trigger_name); | |
390 | element_trigger_name = status == LTTNG_TRIGGER_STATUS_OK ? | |
391 | element_trigger_name : NULL; | |
242388e4 JR |
392 | |
393 | status = lttng_trigger_get_name(trigger_key, &key_name); | |
0efb2ad7 | 394 | key_name = status == LTTNG_TRIGGER_STATUS_OK ? key_name : NULL; |
242388e4 | 395 | |
0efb2ad7 JG |
396 | /* |
397 | * Compare the names. | |
398 | * Consider null names as not equal. This is to maintain backwards | |
399 | * compatibility with pre-2.13 anonymous triggers. Multiples anonymous | |
400 | * triggers are allowed for a given user. | |
401 | */ | |
402 | if (!element_trigger_name || !key_name) { | |
403 | goto end; | |
404 | } | |
405 | ||
406 | if (strcmp(element_trigger_name, key_name) != 0) { | |
242388e4 JR |
407 | goto end; |
408 | } | |
409 | ||
410 | /* Compare the owners' UIDs. */ | |
411 | key_creds = lttng_trigger_get_credentials(trigger_key); | |
412 | node_creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
413 | ||
414 | match = lttng_credentials_is_equal_uid(key_creds, node_creds); | |
415 | ||
416 | end: | |
417 | return match; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Hash trigger based on name and credentials only. | |
422 | */ | |
423 | static | |
424 | unsigned long hash_trigger_by_name_uid(const struct lttng_trigger *trigger) | |
425 | { | |
426 | unsigned long hash = 0; | |
427 | const struct lttng_credentials *trigger_creds; | |
428 | const char *trigger_name; | |
429 | enum lttng_trigger_status status; | |
430 | ||
431 | status = lttng_trigger_get_name(trigger, &trigger_name); | |
432 | if (status == LTTNG_TRIGGER_STATUS_OK) { | |
433 | hash = hash_key_str(trigger_name, lttng_ht_seed); | |
434 | } | |
435 | ||
436 | trigger_creds = lttng_trigger_get_credentials(trigger); | |
437 | hash ^= hash_key_ulong((void *) (unsigned long) LTTNG_OPTIONAL_GET(trigger_creds->uid), | |
438 | lttng_ht_seed); | |
439 | ||
440 | return hash; | |
441 | } | |
442 | ||
e4db5ace JR |
443 | static |
444 | unsigned long hash_channel_key(struct channel_key *key) | |
445 | { | |
446 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
447 | unsigned long domain_hash = hash_key_ulong( | |
448 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
449 | ||
450 | return key_hash ^ domain_hash; | |
451 | } | |
452 | ||
ac1889bf JG |
453 | static |
454 | unsigned long hash_client_socket(int socket) | |
455 | { | |
456 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
457 | } | |
458 | ||
459 | static | |
460 | unsigned long hash_client_id(notification_client_id id) | |
461 | { | |
462 | return hash_key_u64(&id, lttng_ht_seed); | |
463 | } | |
464 | ||
f82f93a1 JG |
465 | /* |
466 | * Get the type of object to which a given condition applies. Bindings let | |
467 | * the notification system evaluate a trigger's condition when a given | |
468 | * object's state is updated. | |
469 | * | |
470 | * For instance, a condition bound to a channel will be evaluated everytime | |
471 | * the channel's state is changed by a channel monitoring sample. | |
472 | */ | |
473 | static | |
474 | enum lttng_object_type get_condition_binding_object( | |
475 | const struct lttng_condition *condition) | |
476 | { | |
477 | switch (lttng_condition_get_type(condition)) { | |
478 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
479 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
480 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 481 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
482 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
483 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
484 | return LTTNG_OBJECT_TYPE_SESSION; | |
8dbb86b8 | 485 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 | 486 | return LTTNG_OBJECT_TYPE_NONE; |
f82f93a1 JG |
487 | default: |
488 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
489 | } | |
490 | } | |
491 | ||
83b934ad MD |
492 | static |
493 | void free_channel_info_rcu(struct rcu_head *node) | |
494 | { | |
495 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
496 | } | |
497 | ||
ab0ee2ca JG |
498 | static |
499 | void channel_info_destroy(struct channel_info *channel_info) | |
500 | { | |
501 | if (!channel_info) { | |
502 | return; | |
503 | } | |
504 | ||
8abe313a JG |
505 | if (channel_info->session_info) { |
506 | session_info_remove_channel(channel_info->session_info, | |
507 | channel_info); | |
508 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 509 | } |
8abe313a JG |
510 | if (channel_info->name) { |
511 | free(channel_info->name); | |
ab0ee2ca | 512 | } |
83b934ad MD |
513 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
514 | } | |
515 | ||
516 | static | |
517 | void free_session_info_rcu(struct rcu_head *node) | |
518 | { | |
519 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
520 | } |
521 | ||
8abe313a | 522 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 523 | static |
8abe313a | 524 | void session_info_destroy(void *_data) |
ab0ee2ca | 525 | { |
8abe313a | 526 | struct session_info *session_info = _data; |
3b68d0a3 | 527 | int ret; |
ab0ee2ca | 528 | |
8abe313a JG |
529 | assert(session_info); |
530 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
531 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
532 | if (ret) { | |
4c3f302b | 533 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 534 | } |
8abe313a | 535 | } |
ea9a44f0 | 536 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
537 | |
538 | rcu_read_lock(); | |
539 | cds_lfht_del(session_info->sessions_ht, | |
540 | &session_info->sessions_ht_node); | |
541 | rcu_read_unlock(); | |
8abe313a | 542 | free(session_info->name); |
83b934ad | 543 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 544 | } |
ab0ee2ca | 545 | |
8abe313a JG |
546 | static |
547 | void session_info_get(struct session_info *session_info) | |
548 | { | |
549 | if (!session_info) { | |
550 | return; | |
551 | } | |
552 | lttng_ref_get(&session_info->ref); | |
553 | } | |
554 | ||
555 | static | |
556 | void session_info_put(struct session_info *session_info) | |
557 | { | |
558 | if (!session_info) { | |
559 | return; | |
ab0ee2ca | 560 | } |
8abe313a JG |
561 | lttng_ref_put(&session_info->ref); |
562 | } | |
563 | ||
564 | static | |
ea9a44f0 | 565 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
566 | struct lttng_session_trigger_list *trigger_list, |
567 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
568 | { |
569 | struct session_info *session_info; | |
ab0ee2ca | 570 | |
8abe313a | 571 | assert(name); |
ab0ee2ca | 572 | |
8abe313a JG |
573 | session_info = zmalloc(sizeof(*session_info)); |
574 | if (!session_info) { | |
575 | goto end; | |
576 | } | |
577 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
578 | ||
579 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
580 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
581 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
582 | goto error; |
583 | } | |
8abe313a JG |
584 | |
585 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
586 | session_info->name = strdup(name); | |
587 | if (!session_info->name) { | |
ab0ee2ca JG |
588 | goto error; |
589 | } | |
8abe313a JG |
590 | session_info->uid = uid; |
591 | session_info->gid = gid; | |
ea9a44f0 | 592 | session_info->trigger_list = trigger_list; |
1eee26c5 | 593 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
594 | end: |
595 | return session_info; | |
596 | error: | |
597 | session_info_put(session_info); | |
598 | return NULL; | |
599 | } | |
600 | ||
601 | static | |
602 | void session_info_add_channel(struct session_info *session_info, | |
603 | struct channel_info *channel_info) | |
604 | { | |
605 | rcu_read_lock(); | |
606 | cds_lfht_add(session_info->channel_infos_ht, | |
607 | hash_channel_key(&channel_info->key), | |
608 | &channel_info->session_info_channels_ht_node); | |
609 | rcu_read_unlock(); | |
610 | } | |
611 | ||
612 | static | |
613 | void session_info_remove_channel(struct session_info *session_info, | |
614 | struct channel_info *channel_info) | |
615 | { | |
616 | rcu_read_lock(); | |
617 | cds_lfht_del(session_info->channel_infos_ht, | |
618 | &channel_info->session_info_channels_ht_node); | |
619 | rcu_read_unlock(); | |
620 | } | |
621 | ||
622 | static | |
623 | struct channel_info *channel_info_create(const char *channel_name, | |
624 | struct channel_key *channel_key, uint64_t channel_capacity, | |
625 | struct session_info *session_info) | |
626 | { | |
627 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
628 | ||
629 | if (!channel_info) { | |
630 | goto end; | |
631 | } | |
632 | ||
ab0ee2ca | 633 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
634 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
635 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
636 | channel_info->capacity = channel_capacity; | |
637 | ||
638 | channel_info->name = strdup(channel_name); | |
639 | if (!channel_info->name) { | |
640 | goto error; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Set the references between session and channel infos: | |
645 | * - channel_info holds a strong reference to session_info | |
646 | * - session_info holds a weak reference to channel_info | |
647 | */ | |
648 | session_info_get(session_info); | |
649 | session_info_add_channel(session_info, channel_info); | |
650 | channel_info->session_info = session_info; | |
ab0ee2ca | 651 | end: |
8abe313a | 652 | return channel_info; |
ab0ee2ca | 653 | error: |
8abe313a | 654 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
655 | return NULL; |
656 | } | |
657 | ||
f2b3ef9f | 658 | LTTNG_HIDDEN |
505b2d90 JG |
659 | bool notification_client_list_get(struct notification_client_list *list) |
660 | { | |
661 | return urcu_ref_get_unless_zero(&list->ref); | |
662 | } | |
663 | ||
664 | static | |
665 | void free_notification_client_list_rcu(struct rcu_head *node) | |
666 | { | |
667 | free(caa_container_of(node, struct notification_client_list, | |
668 | rcu_node)); | |
669 | } | |
670 | ||
671 | static | |
672 | void notification_client_list_release(struct urcu_ref *list_ref) | |
673 | { | |
674 | struct notification_client_list *list = | |
675 | container_of(list_ref, typeof(*list), ref); | |
676 | struct notification_client_list_element *client_list_element, *tmp; | |
677 | ||
091fa780 FD |
678 | lttng_condition_put(list->condition); |
679 | ||
505b2d90 JG |
680 | if (list->notification_trigger_clients_ht) { |
681 | rcu_read_lock(); | |
091fa780 | 682 | |
505b2d90 JG |
683 | cds_lfht_del(list->notification_trigger_clients_ht, |
684 | &list->notification_trigger_clients_ht_node); | |
685 | rcu_read_unlock(); | |
686 | list->notification_trigger_clients_ht = NULL; | |
687 | } | |
688 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 689 | &list->clients_list, node) { |
505b2d90 JG |
690 | free(client_list_element); |
691 | } | |
091fa780 FD |
692 | |
693 | assert(cds_list_empty(&list->triggers_list)); | |
694 | ||
505b2d90 JG |
695 | pthread_mutex_destroy(&list->lock); |
696 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
697 | } | |
698 | ||
091fa780 FD |
699 | static |
700 | bool condition_applies_to_client(const struct lttng_condition *condition, | |
701 | struct notification_client *client) | |
702 | { | |
703 | bool applies = false; | |
704 | struct lttng_condition_list_element *condition_list_element; | |
705 | ||
706 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
707 | node) { | |
708 | applies = lttng_condition_is_equal( | |
709 | condition_list_element->condition, | |
710 | condition); | |
711 | if (applies) { | |
712 | break; | |
713 | } | |
714 | } | |
715 | ||
716 | return applies; | |
717 | } | |
718 | ||
505b2d90 JG |
719 | static |
720 | struct notification_client_list *notification_client_list_create( | |
091fa780 FD |
721 | struct notification_thread_state *state, |
722 | const struct lttng_condition *condition) | |
505b2d90 | 723 | { |
091fa780 FD |
724 | struct notification_client *client; |
725 | struct cds_lfht_iter iter; | |
726 | struct notification_client_list *client_list; | |
505b2d90 | 727 | |
091fa780 | 728 | client_list = zmalloc(sizeof(*client_list)); |
505b2d90 | 729 | if (!client_list) { |
091fa780 FD |
730 | PERROR("Failed to allocate notification client list"); |
731 | goto end; | |
505b2d90 | 732 | } |
091fa780 | 733 | |
505b2d90 | 734 | pthread_mutex_init(&client_list->lock, NULL); |
091fa780 FD |
735 | /* |
736 | * The trigger that owns the condition has the first reference to this | |
737 | * client list. | |
738 | */ | |
505b2d90 JG |
739 | urcu_ref_init(&client_list->ref); |
740 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
091fa780 FD |
741 | CDS_INIT_LIST_HEAD(&client_list->clients_list); |
742 | CDS_INIT_LIST_HEAD(&client_list->triggers_list); | |
505b2d90 | 743 | |
091fa780 FD |
744 | /* |
745 | * Create a copy of the condition so that it's independent of any | |
746 | * trigger. The client list may outlive the trigger object (which owns | |
747 | * the condition) that is used to create it. | |
748 | */ | |
749 | client_list->condition = lttng_condition_copy(condition); | |
750 | ||
751 | /* Build a list of clients to which this new condition applies. */ | |
752 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
753 | client_socket_ht_node) { | |
754 | struct notification_client_list_element *client_list_element; | |
505b2d90 | 755 | |
091fa780 FD |
756 | if (!condition_applies_to_client(condition, client)) { |
757 | continue; | |
758 | } | |
759 | ||
760 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
761 | if (!client_list_element) { | |
762 | goto error_put_client_list; | |
763 | } | |
505b2d90 | 764 | |
091fa780 FD |
765 | CDS_INIT_LIST_HEAD(&client_list_element->node); |
766 | client_list_element->client = client; | |
767 | cds_list_add(&client_list_element->node, &client_list->clients_list); | |
768 | } | |
769 | ||
770 | client_list->notification_trigger_clients_ht = | |
505b2d90 JG |
771 | state->notification_trigger_clients_ht; |
772 | ||
773 | rcu_read_lock(); | |
091fa780 FD |
774 | /* |
775 | * Add the client list to the global list of client list. | |
776 | */ | |
777 | cds_lfht_add_unique(state->notification_trigger_clients_ht, | |
778 | lttng_condition_hash(client_list->condition), | |
779 | match_client_list_condition, | |
780 | client_list->condition, | |
781 | &client_list->notification_trigger_clients_ht_node); | |
505b2d90 | 782 | rcu_read_unlock(); |
091fa780 FD |
783 | goto end; |
784 | ||
785 | error_put_client_list: | |
786 | notification_client_list_put(client_list); | |
787 | client_list = NULL; | |
788 | ||
789 | end: | |
790 | return client_list; | |
505b2d90 JG |
791 | } |
792 | ||
505b2d90 JG |
793 | void notification_client_list_put(struct notification_client_list *list) |
794 | { | |
795 | if (!list) { | |
796 | return; | |
797 | } | |
798 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
799 | } | |
800 | ||
801 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
802 | static |
803 | struct notification_client_list *get_client_list_from_condition( | |
804 | struct notification_thread_state *state, | |
805 | const struct lttng_condition *condition) | |
806 | { | |
807 | struct cds_lfht_node *node; | |
808 | struct cds_lfht_iter iter; | |
505b2d90 | 809 | struct notification_client_list *list = NULL; |
ed327204 | 810 | |
505b2d90 | 811 | rcu_read_lock(); |
ed327204 JG |
812 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
813 | lttng_condition_hash(condition), | |
814 | match_client_list_condition, | |
815 | condition, | |
816 | &iter); | |
817 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
818 | if (node) { |
819 | list = container_of(node, struct notification_client_list, | |
820 | notification_trigger_clients_ht_node); | |
821 | list = notification_client_list_get(list) ? list : NULL; | |
822 | } | |
ed327204 | 823 | |
505b2d90 JG |
824 | rcu_read_unlock(); |
825 | return list; | |
ed327204 JG |
826 | } |
827 | ||
e4db5ace | 828 | static |
f82f93a1 JG |
829 | int evaluate_channel_condition_for_client( |
830 | const struct lttng_condition *condition, | |
831 | struct notification_thread_state *state, | |
832 | struct lttng_evaluation **evaluation, | |
833 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
834 | { |
835 | int ret; | |
836 | struct cds_lfht_iter iter; | |
837 | struct cds_lfht_node *node; | |
838 | struct channel_info *channel_info = NULL; | |
839 | struct channel_key *channel_key = NULL; | |
840 | struct channel_state_sample *last_sample = NULL; | |
841 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 842 | |
505b2d90 JG |
843 | rcu_read_lock(); |
844 | ||
f82f93a1 | 845 | /* Find the channel associated with the condition. */ |
e4db5ace | 846 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 847 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
848 | struct lttng_trigger_list_element *element; |
849 | ||
850 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 851 | const struct lttng_condition *current_condition = |
f82f93a1 | 852 | lttng_trigger_get_const_condition( |
e4db5ace JR |
853 | element->trigger); |
854 | ||
855 | assert(current_condition); | |
856 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 857 | current_condition)) { |
e4db5ace JR |
858 | continue; |
859 | } | |
860 | ||
861 | /* Found the trigger, save the channel key. */ | |
862 | channel_key = &channel_trigger_list->channel_key; | |
863 | break; | |
864 | } | |
865 | if (channel_key) { | |
866 | /* The channel key was found stop iteration. */ | |
867 | break; | |
868 | } | |
869 | } | |
870 | ||
871 | if (!channel_key){ | |
872 | /* No channel found; normal exit. */ | |
f82f93a1 | 873 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
874 | ret = 0; |
875 | goto end; | |
876 | } | |
877 | ||
878 | /* Fetch channel info for the matching channel. */ | |
879 | cds_lfht_lookup(state->channels_ht, | |
880 | hash_channel_key(channel_key), | |
881 | match_channel_info, | |
882 | channel_key, | |
883 | &iter); | |
884 | node = cds_lfht_iter_get_node(&iter); | |
885 | assert(node); | |
886 | channel_info = caa_container_of(node, struct channel_info, | |
887 | channels_ht_node); | |
888 | ||
889 | /* Retrieve the channel's last sample, if it exists. */ | |
890 | cds_lfht_lookup(state->channel_state_ht, | |
891 | hash_channel_key(channel_key), | |
892 | match_channel_state_sample, | |
893 | channel_key, | |
894 | &iter); | |
895 | node = cds_lfht_iter_get_node(&iter); | |
896 | if (node) { | |
897 | last_sample = caa_container_of(node, | |
898 | struct channel_state_sample, | |
899 | channel_state_ht_node); | |
900 | } else { | |
901 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
902 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
903 | ret = 0; | |
904 | goto end; | |
905 | } | |
906 | ||
f82f93a1 | 907 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
908 | NULL, last_sample, |
909 | 0, channel_info->session_info->consumed_data_size, | |
910 | channel_info); | |
e4db5ace | 911 | if (ret) { |
066a3c82 | 912 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
913 | goto end; |
914 | } | |
915 | ||
f82f93a1 JG |
916 | *session_uid = channel_info->session_info->uid; |
917 | *session_gid = channel_info->session_info->gid; | |
918 | end: | |
505b2d90 | 919 | rcu_read_unlock(); |
f82f93a1 JG |
920 | return ret; |
921 | } | |
922 | ||
923 | static | |
924 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
925 | { | |
926 | const char *session_name = NULL; | |
927 | enum lttng_condition_status status; | |
928 | ||
929 | switch (lttng_condition_get_type(condition)) { | |
930 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
931 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
932 | status = lttng_condition_buffer_usage_get_session_name( | |
933 | condition, &session_name); | |
934 | break; | |
935 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
936 | status = lttng_condition_session_consumed_size_get_session_name( | |
937 | condition, &session_name); | |
938 | break; | |
939 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
940 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
941 | status = lttng_condition_session_rotation_get_session_name( | |
942 | condition, &session_name); | |
943 | break; | |
944 | default: | |
945 | abort(); | |
946 | } | |
947 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
948 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
949 | goto end; | |
950 | } | |
951 | end: | |
952 | return session_name; | |
953 | } | |
954 | ||
f82f93a1 JG |
955 | static |
956 | int evaluate_session_condition_for_client( | |
957 | const struct lttng_condition *condition, | |
958 | struct notification_thread_state *state, | |
959 | struct lttng_evaluation **evaluation, | |
960 | uid_t *session_uid, gid_t *session_gid) | |
961 | { | |
962 | int ret; | |
963 | struct cds_lfht_iter iter; | |
964 | struct cds_lfht_node *node; | |
965 | const char *session_name; | |
966 | struct session_info *session_info = NULL; | |
967 | ||
505b2d90 | 968 | rcu_read_lock(); |
f82f93a1 JG |
969 | session_name = get_condition_session_name(condition); |
970 | ||
971 | /* Find the session associated with the trigger. */ | |
972 | cds_lfht_lookup(state->sessions_ht, | |
973 | hash_key_str(session_name, lttng_ht_seed), | |
974 | match_session, | |
975 | session_name, | |
976 | &iter); | |
977 | node = cds_lfht_iter_get_node(&iter); | |
978 | if (!node) { | |
979 | DBG("[notification-thread] No known session matching name \"%s\"", | |
980 | session_name); | |
981 | ret = 0; | |
982 | goto end; | |
983 | } | |
984 | ||
985 | session_info = caa_container_of(node, struct session_info, | |
986 | sessions_ht_node); | |
987 | session_info_get(session_info); | |
988 | ||
989 | /* | |
990 | * Evaluation is performed in-line here since only one type of | |
991 | * session-bound condition is handled for the moment. | |
992 | */ | |
993 | switch (lttng_condition_get_type(condition)) { | |
994 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
995 | if (!session_info->rotation.ongoing) { | |
be558f88 | 996 | ret = 0; |
f82f93a1 JG |
997 | goto end_session_put; |
998 | } | |
999 | ||
1000 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1001 | session_info->rotation.id); | |
1002 | if (!*evaluation) { | |
1003 | /* Fatal error. */ | |
1004 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
1005 | session_info->name); | |
1006 | ret = -1; | |
1007 | goto end_session_put; | |
1008 | } | |
1009 | ret = 0; | |
1010 | break; | |
1011 | default: | |
1012 | ret = 0; | |
1013 | goto end_session_put; | |
1014 | } | |
1015 | ||
1016 | *session_uid = session_info->uid; | |
1017 | *session_gid = session_info->gid; | |
1018 | ||
1019 | end_session_put: | |
1020 | session_info_put(session_info); | |
1021 | end: | |
505b2d90 | 1022 | rcu_read_unlock(); |
f82f93a1 JG |
1023 | return ret; |
1024 | } | |
1025 | ||
f82f93a1 JG |
1026 | static |
1027 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
1028 | const struct lttng_condition *condition, | |
1029 | struct notification_client *client, | |
1030 | struct notification_thread_state *state) | |
1031 | { | |
1032 | int ret; | |
1033 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
1034 | struct notification_client_list client_list = { |
1035 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
1036 | }; | |
f82f93a1 JG |
1037 | struct notification_client_list_element client_list_element = { 0 }; |
1038 | uid_t object_uid = 0; | |
1039 | gid_t object_gid = 0; | |
1040 | ||
1041 | assert(trigger); | |
1042 | assert(condition); | |
1043 | assert(client); | |
1044 | assert(state); | |
1045 | ||
1046 | switch (get_condition_binding_object(condition)) { | |
1047 | case LTTNG_OBJECT_TYPE_SESSION: | |
1048 | ret = evaluate_session_condition_for_client(condition, state, | |
1049 | &evaluation, &object_uid, &object_gid); | |
1050 | break; | |
1051 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
1052 | ret = evaluate_channel_condition_for_client(condition, state, | |
1053 | &evaluation, &object_uid, &object_gid); | |
1054 | break; | |
1055 | case LTTNG_OBJECT_TYPE_NONE: | |
7e802d0a | 1056 | DBG("[notification-thread] Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
1057 | ret = 0; |
1058 | goto end; | |
1059 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
1060 | default: | |
1061 | ret = -1; | |
1062 | goto end; | |
1063 | } | |
af0c318d JG |
1064 | if (ret) { |
1065 | /* Fatal error. */ | |
1066 | goto end; | |
1067 | } | |
e4db5ace JR |
1068 | if (!evaluation) { |
1069 | /* Evaluation yielded nothing. Normal exit. */ | |
1070 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
1071 | ret = 0; | |
1072 | goto end; | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * Create a temporary client list with the client currently | |
1077 | * subscribing. | |
1078 | */ | |
505b2d90 | 1079 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
091fa780 | 1080 | CDS_INIT_LIST_HEAD(&client_list.clients_list); |
e4db5ace JR |
1081 | |
1082 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1083 | client_list_element.client = client; | |
091fa780 | 1084 | cds_list_add(&client_list_element.node, &client_list.clients_list); |
e4db5ace JR |
1085 | |
1086 | /* Send evaluation result to the newly-subscribed client. */ | |
1087 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
1088 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 1089 | state, object_uid, object_gid); |
e4db5ace JR |
1090 | |
1091 | end: | |
1092 | return ret; | |
1093 | } | |
1094 | ||
ab0ee2ca JG |
1095 | static |
1096 | int notification_thread_client_subscribe(struct notification_client *client, | |
1097 | struct lttng_condition *condition, | |
1098 | struct notification_thread_state *state, | |
1099 | enum lttng_notification_channel_status *_status) | |
1100 | { | |
1101 | int ret = 0; | |
505b2d90 | 1102 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1103 | struct lttng_condition_list_element *condition_list_element = NULL; |
1104 | struct notification_client_list_element *client_list_element = NULL; | |
a3ed2a4e | 1105 | struct lttng_trigger_ht_element *trigger_ht_element; |
ab0ee2ca JG |
1106 | enum lttng_notification_channel_status status = |
1107 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1108 | ||
1109 | /* | |
1110 | * Ensure that the client has not already subscribed to this condition | |
1111 | * before. | |
1112 | */ | |
1113 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1114 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1115 | condition)) { | |
1116 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1117 | goto end; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1122 | if (!condition_list_element) { | |
1123 | ret = -1; | |
1124 | goto error; | |
1125 | } | |
1126 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1127 | if (!client_list_element) { | |
1128 | ret = -1; | |
1129 | goto error; | |
1130 | } | |
1131 | ||
ab0ee2ca JG |
1132 | /* |
1133 | * Add the newly-subscribed condition to the client's subscription list. | |
1134 | */ | |
1135 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1136 | condition_list_element->condition = condition; | |
5a6306f7 | 1137 | condition = NULL; |
ab0ee2ca JG |
1138 | cds_list_add(&condition_list_element->node, &client->condition_list); |
1139 | ||
5a6306f7 JG |
1140 | client_list = get_client_list_from_condition( |
1141 | state, condition_list_element->condition); | |
ed327204 | 1142 | if (!client_list) { |
2ae99f0b JG |
1143 | /* |
1144 | * No notification-emiting trigger registered with this | |
1145 | * condition. We don't evaluate the condition right away | |
1146 | * since this trigger is not registered yet. | |
1147 | */ | |
4fb43b68 | 1148 | free(client_list_element); |
505b2d90 | 1149 | goto end; |
ab0ee2ca JG |
1150 | } |
1151 | ||
2ae99f0b JG |
1152 | /* |
1153 | * The condition to which the client just subscribed is evaluated | |
1154 | * at this point so that conditions that are already TRUE result | |
1155 | * in a notification being sent out. | |
505b2d90 | 1156 | * |
57644a7f JG |
1157 | * Note the iteration on all triggers which share an identical |
1158 | * `condition` than the one to which the client is registering. This is | |
1159 | * done to ensure that the client receives a distinct notification for | |
1160 | * all triggers that have a `notify` action that have this condition. | |
2ae99f0b | 1161 | */ |
091fa780 FD |
1162 | pthread_mutex_lock(&client_list->lock); |
1163 | cds_list_for_each_entry(trigger_ht_element, | |
1164 | &client_list->triggers_list, client_list_trigger_node) { | |
5a6306f7 | 1165 | if (evaluate_condition_for_client(trigger_ht_element->trigger, condition_list_element->condition, |
091fa780 FD |
1166 | client, state)) { |
1167 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1168 | ret = -1; | |
1169 | free(client_list_element); | |
ecc7ed07 | 1170 | pthread_mutex_unlock(&client_list->lock); |
091fa780 FD |
1171 | goto end; |
1172 | } | |
e4db5ace | 1173 | } |
091fa780 | 1174 | pthread_mutex_unlock(&client_list->lock); |
e4db5ace JR |
1175 | |
1176 | /* | |
1177 | * Add the client to the list of clients interested in a given trigger | |
1178 | * if a "notification" trigger with a corresponding condition was | |
1179 | * added prior. | |
1180 | */ | |
ab0ee2ca JG |
1181 | client_list_element->client = client; |
1182 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1183 | |
1184 | pthread_mutex_lock(&client_list->lock); | |
091fa780 | 1185 | cds_list_add(&client_list_element->node, &client_list->clients_list); |
505b2d90 | 1186 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1187 | end: |
1188 | if (_status) { | |
1189 | *_status = status; | |
1190 | } | |
505b2d90 JG |
1191 | if (client_list) { |
1192 | notification_client_list_put(client_list); | |
1193 | } | |
5a6306f7 | 1194 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1195 | return ret; |
1196 | error: | |
1197 | free(condition_list_element); | |
1198 | free(client_list_element); | |
5a6306f7 | 1199 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1200 | return ret; |
1201 | } | |
1202 | ||
1203 | static | |
1204 | int notification_thread_client_unsubscribe( | |
1205 | struct notification_client *client, | |
1206 | struct lttng_condition *condition, | |
1207 | struct notification_thread_state *state, | |
1208 | enum lttng_notification_channel_status *_status) | |
1209 | { | |
ab0ee2ca JG |
1210 | struct notification_client_list *client_list; |
1211 | struct lttng_condition_list_element *condition_list_element, | |
1212 | *condition_tmp; | |
1213 | struct notification_client_list_element *client_list_element, | |
1214 | *client_tmp; | |
1215 | bool condition_found = false; | |
1216 | enum lttng_notification_channel_status status = | |
1217 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1218 | ||
1219 | /* Remove the condition from the client's condition list. */ | |
1220 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1221 | &client->condition_list, node) { | |
1222 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1223 | condition)) { | |
1224 | continue; | |
1225 | } | |
1226 | ||
1227 | cds_list_del(&condition_list_element->node); | |
1228 | /* | |
1229 | * The caller may be iterating on the client's conditions to | |
1230 | * tear down a client's connection. In this case, the condition | |
1231 | * will be destroyed at the end. | |
1232 | */ | |
1233 | if (condition != condition_list_element->condition) { | |
1234 | lttng_condition_destroy( | |
1235 | condition_list_element->condition); | |
1236 | } | |
1237 | free(condition_list_element); | |
1238 | condition_found = true; | |
1239 | break; | |
1240 | } | |
1241 | ||
1242 | if (!condition_found) { | |
1243 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1244 | goto end; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * Remove the client from the list of clients interested the trigger | |
1249 | * matching the condition. | |
1250 | */ | |
ed327204 JG |
1251 | client_list = get_client_list_from_condition(state, condition); |
1252 | if (!client_list) { | |
505b2d90 | 1253 | goto end; |
ab0ee2ca JG |
1254 | } |
1255 | ||
505b2d90 | 1256 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 1257 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
091fa780 | 1258 | &client_list->clients_list, node) { |
505b2d90 | 1259 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1260 | continue; |
1261 | } | |
1262 | cds_list_del(&client_list_element->node); | |
1263 | free(client_list_element); | |
1264 | break; | |
1265 | } | |
505b2d90 JG |
1266 | pthread_mutex_unlock(&client_list->lock); |
1267 | notification_client_list_put(client_list); | |
1268 | client_list = NULL; | |
ab0ee2ca JG |
1269 | end: |
1270 | lttng_condition_destroy(condition); | |
1271 | if (_status) { | |
1272 | *_status = status; | |
1273 | } | |
1274 | return 0; | |
1275 | } | |
1276 | ||
83b934ad MD |
1277 | static |
1278 | void free_notification_client_rcu(struct rcu_head *node) | |
1279 | { | |
1280 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1281 | } | |
1282 | ||
ab0ee2ca JG |
1283 | static |
1284 | void notification_client_destroy(struct notification_client *client, | |
1285 | struct notification_thread_state *state) | |
1286 | { | |
ab0ee2ca JG |
1287 | if (!client) { |
1288 | return; | |
1289 | } | |
1290 | ||
505b2d90 JG |
1291 | /* |
1292 | * The client object is not reachable by other threads, no need to lock | |
1293 | * the client here. | |
1294 | */ | |
ab0ee2ca JG |
1295 | if (client->socket >= 0) { |
1296 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1297 | client->socket = -1; |
ab0ee2ca | 1298 | } |
505b2d90 | 1299 | client->communication.active = false; |
882093ee JR |
1300 | lttng_payload_reset(&client->communication.inbound.payload); |
1301 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1302 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1303 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1304 | } |
1305 | ||
1306 | /* | |
1307 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1308 | * client pointer). | |
1309 | */ | |
1310 | static | |
1311 | struct notification_client *get_client_from_socket(int socket, | |
1312 | struct notification_thread_state *state) | |
1313 | { | |
1314 | struct cds_lfht_iter iter; | |
1315 | struct cds_lfht_node *node; | |
1316 | struct notification_client *client = NULL; | |
1317 | ||
1318 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1319 | hash_client_socket(socket), |
1320 | match_client_socket, | |
ab0ee2ca JG |
1321 | (void *) (unsigned long) socket, |
1322 | &iter); | |
1323 | node = cds_lfht_iter_get_node(&iter); | |
1324 | if (!node) { | |
1325 | goto end; | |
1326 | } | |
1327 | ||
1328 | client = caa_container_of(node, struct notification_client, | |
1329 | client_socket_ht_node); | |
1330 | end: | |
1331 | return client; | |
1332 | } | |
1333 | ||
f2b3ef9f JG |
1334 | /* |
1335 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1336 | * client pointer). | |
1337 | */ | |
1338 | static | |
1339 | struct notification_client *get_client_from_id(notification_client_id id, | |
1340 | struct notification_thread_state *state) | |
1341 | { | |
1342 | struct cds_lfht_iter iter; | |
1343 | struct cds_lfht_node *node; | |
1344 | struct notification_client *client = NULL; | |
1345 | ||
1346 | cds_lfht_lookup(state->client_id_ht, | |
1347 | hash_client_id(id), | |
1348 | match_client_id, | |
1349 | &id, | |
1350 | &iter); | |
1351 | node = cds_lfht_iter_get_node(&iter); | |
1352 | if (!node) { | |
1353 | goto end; | |
1354 | } | |
1355 | ||
1356 | client = caa_container_of(node, struct notification_client, | |
1357 | client_id_ht_node); | |
1358 | end: | |
1359 | return client; | |
1360 | } | |
1361 | ||
ab0ee2ca | 1362 | static |
e8360425 | 1363 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1364 | const struct lttng_condition *condition, |
1365 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1366 | { |
1367 | enum lttng_condition_status status; | |
e8360425 JD |
1368 | enum lttng_domain_type condition_domain; |
1369 | const char *condition_session_name = NULL; | |
1370 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1371 | |
e8360425 JD |
1372 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1373 | &condition_domain); | |
1374 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1375 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1376 | goto fail; |
1377 | } | |
1378 | ||
e8360425 JD |
1379 | status = lttng_condition_buffer_usage_get_session_name( |
1380 | condition, &condition_session_name); | |
1381 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1382 | ||
1383 | status = lttng_condition_buffer_usage_get_channel_name( | |
1384 | condition, &condition_channel_name); | |
1385 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1386 | ||
1387 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1388 | goto fail; | |
1389 | } | |
1390 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1391 | goto fail; |
1392 | } | |
1393 | ||
e8360425 JD |
1394 | return true; |
1395 | fail: | |
1396 | return false; | |
1397 | } | |
1398 | ||
1399 | static | |
1400 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1401 | const struct lttng_condition *condition, |
1402 | const struct channel_info *channel_info) | |
e8360425 JD |
1403 | { |
1404 | enum lttng_condition_status status; | |
1405 | const char *condition_session_name = NULL; | |
1406 | ||
1407 | status = lttng_condition_session_consumed_size_get_session_name( | |
1408 | condition, &condition_session_name); | |
1409 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1410 | ||
1411 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1412 | goto fail; |
1413 | } | |
1414 | ||
e8360425 JD |
1415 | return true; |
1416 | fail: | |
1417 | return false; | |
1418 | } | |
ab0ee2ca | 1419 | |
51eab943 JG |
1420 | static |
1421 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1422 | const struct channel_info *channel_info) | |
1423 | { | |
1424 | const struct lttng_condition *condition; | |
e8360425 | 1425 | bool trigger_applies; |
ab0ee2ca | 1426 | |
51eab943 | 1427 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1428 | if (!condition) { |
ab0ee2ca JG |
1429 | goto fail; |
1430 | } | |
e8360425 JD |
1431 | |
1432 | switch (lttng_condition_get_type(condition)) { | |
1433 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1434 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1435 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1436 | condition, channel_info); | |
1437 | break; | |
1438 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1439 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1440 | condition, channel_info); | |
1441 | break; | |
1442 | default: | |
ab0ee2ca JG |
1443 | goto fail; |
1444 | } | |
1445 | ||
e8360425 | 1446 | return trigger_applies; |
ab0ee2ca JG |
1447 | fail: |
1448 | return false; | |
1449 | } | |
1450 | ||
ed327204 JG |
1451 | /* Must be called with RCU read lock held. */ |
1452 | static | |
1453 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1454 | struct notification_thread_state *state, | |
1455 | const char *session_name) | |
1456 | { | |
1457 | struct lttng_session_trigger_list *list = NULL; | |
1458 | struct cds_lfht_node *node; | |
1459 | struct cds_lfht_iter iter; | |
1460 | ||
1461 | cds_lfht_lookup(state->session_triggers_ht, | |
1462 | hash_key_str(session_name, lttng_ht_seed), | |
1463 | match_session_trigger_list, | |
1464 | session_name, | |
1465 | &iter); | |
1466 | node = cds_lfht_iter_get_node(&iter); | |
1467 | if (!node) { | |
1468 | /* | |
1469 | * Not an error, the list of triggers applying to that session | |
1470 | * will be initialized when the session is created. | |
1471 | */ | |
1472 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1473 | session_name); | |
1474 | goto end; | |
1475 | } | |
1476 | ||
e742b055 | 1477 | list = caa_container_of(node, |
ed327204 JG |
1478 | struct lttng_session_trigger_list, |
1479 | session_triggers_ht_node); | |
1480 | end: | |
1481 | return list; | |
1482 | } | |
1483 | ||
ea9a44f0 JG |
1484 | /* |
1485 | * Allocate an empty lttng_session_trigger_list for the session named | |
1486 | * 'session_name'. | |
1487 | * | |
1488 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1489 | * It is the caller's responsability to ensure the session name is alive | |
1490 | * for as long as this list is. | |
1491 | */ | |
1492 | static | |
1493 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1494 | const char *session_name, | |
1495 | struct cds_lfht *session_triggers_ht) | |
1496 | { | |
1497 | struct lttng_session_trigger_list *list; | |
1498 | ||
1499 | list = zmalloc(sizeof(*list)); | |
1500 | if (!list) { | |
1501 | goto end; | |
1502 | } | |
1503 | list->session_name = session_name; | |
1504 | CDS_INIT_LIST_HEAD(&list->list); | |
1505 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1506 | list->session_triggers_ht = session_triggers_ht; | |
1507 | ||
1508 | rcu_read_lock(); | |
1509 | /* Publish the list through the session_triggers_ht. */ | |
1510 | cds_lfht_add(session_triggers_ht, | |
1511 | hash_key_str(session_name, lttng_ht_seed), | |
1512 | &list->session_triggers_ht_node); | |
1513 | rcu_read_unlock(); | |
1514 | end: | |
1515 | return list; | |
1516 | } | |
1517 | ||
1518 | static | |
1519 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1520 | { | |
1521 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1522 | rcu_node)); | |
1523 | } | |
1524 | ||
1525 | static | |
1526 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1527 | { | |
1528 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1529 | ||
1530 | /* Empty the list element by element, and then free the list itself. */ | |
1531 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1532 | &list->list, node) { | |
1533 | cds_list_del(&trigger_list_element->node); | |
1534 | free(trigger_list_element); | |
1535 | } | |
1536 | rcu_read_lock(); | |
1537 | /* Unpublish the list from the session_triggers_ht. */ | |
1538 | cds_lfht_del(list->session_triggers_ht, | |
1539 | &list->session_triggers_ht_node); | |
1540 | rcu_read_unlock(); | |
1541 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1542 | } | |
1543 | ||
1544 | static | |
1545 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1546 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1547 | { |
1548 | int ret = 0; | |
1549 | struct lttng_trigger_list_element *new_element = | |
1550 | zmalloc(sizeof(*new_element)); | |
1551 | ||
1552 | if (!new_element) { | |
1553 | ret = -1; | |
1554 | goto end; | |
1555 | } | |
1556 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1557 | new_element->trigger = trigger; | |
1558 | cds_list_add(&new_element->node, &list->list); | |
1559 | end: | |
1560 | return ret; | |
1561 | } | |
1562 | ||
1563 | static | |
1564 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1565 | const char *session_name) | |
1566 | { | |
1567 | bool applies = false; | |
1568 | const struct lttng_condition *condition; | |
1569 | ||
1570 | condition = lttng_trigger_get_const_condition(trigger); | |
1571 | switch (lttng_condition_get_type(condition)) { | |
1572 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1573 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1574 | { | |
1575 | enum lttng_condition_status condition_status; | |
1576 | const char *condition_session_name; | |
1577 | ||
1578 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1579 | condition, &condition_session_name); | |
1580 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1581 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1582 | goto end; | |
1583 | } | |
1584 | ||
1585 | assert(condition_session_name); | |
1586 | applies = !strcmp(condition_session_name, session_name); | |
1587 | break; | |
1588 | } | |
1589 | default: | |
1590 | goto end; | |
1591 | } | |
1592 | end: | |
1593 | return applies; | |
1594 | } | |
1595 | ||
1596 | /* | |
1597 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1598 | * all triggers that apply to the session named 'session_name'. | |
1599 | * | |
1600 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1601 | * It is the caller's responsability to ensure the session name is alive | |
1602 | * for as long as this list is. | |
1603 | */ | |
1604 | static | |
1605 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1606 | const struct notification_thread_state *state, | |
1607 | const char *session_name) | |
1608 | { | |
1609 | int trigger_count = 0; | |
1610 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1611 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1612 | struct cds_lfht_iter iter; | |
1613 | ||
1614 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1615 | state->session_triggers_ht); | |
1616 | ||
1617 | /* Add all triggers applying to the session named 'session_name'. */ | |
1618 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1619 | node) { | |
1620 | int ret; | |
1621 | ||
1622 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1623 | session_name)) { | |
1624 | continue; | |
1625 | } | |
1626 | ||
1627 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1628 | trigger_ht_element->trigger); | |
1629 | if (ret) { | |
1630 | goto error; | |
1631 | } | |
1632 | ||
1633 | trigger_count++; | |
1634 | } | |
1635 | ||
1636 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1637 | trigger_count); | |
1638 | return session_trigger_list; | |
1639 | error: | |
1640 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1641 | return NULL; | |
1642 | } | |
1643 | ||
8abe313a JG |
1644 | static |
1645 | struct session_info *find_or_create_session_info( | |
1646 | struct notification_thread_state *state, | |
1647 | const char *name, uid_t uid, gid_t gid) | |
1648 | { | |
1649 | struct session_info *session = NULL; | |
1650 | struct cds_lfht_node *node; | |
1651 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1652 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1653 | |
1654 | rcu_read_lock(); | |
1655 | cds_lfht_lookup(state->sessions_ht, | |
1656 | hash_key_str(name, lttng_ht_seed), | |
1657 | match_session, | |
1658 | name, | |
1659 | &iter); | |
1660 | node = cds_lfht_iter_get_node(&iter); | |
1661 | if (node) { | |
1662 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1663 | name, uid, gid); | |
1664 | session = caa_container_of(node, struct session_info, | |
1665 | sessions_ht_node); | |
1666 | assert(session->uid == uid); | |
1667 | assert(session->gid == gid); | |
1eee26c5 JG |
1668 | session_info_get(session); |
1669 | goto end; | |
ea9a44f0 JG |
1670 | } |
1671 | ||
1672 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1673 | if (!trigger_list) { | |
1674 | goto error; | |
8abe313a JG |
1675 | } |
1676 | ||
1eee26c5 JG |
1677 | session = session_info_create(name, uid, gid, trigger_list, |
1678 | state->sessions_ht); | |
8abe313a JG |
1679 | if (!session) { |
1680 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1681 | name, uid, gid); | |
b248644d | 1682 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1683 | goto error; |
8abe313a | 1684 | } |
ea9a44f0 | 1685 | trigger_list = NULL; |
577983cb JG |
1686 | |
1687 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1688 | &session->sessions_ht_node); |
1eee26c5 | 1689 | end: |
8abe313a JG |
1690 | rcu_read_unlock(); |
1691 | return session; | |
ea9a44f0 JG |
1692 | error: |
1693 | rcu_read_unlock(); | |
1694 | session_info_put(session); | |
1695 | return NULL; | |
8abe313a JG |
1696 | } |
1697 | ||
ab0ee2ca JG |
1698 | static |
1699 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1700 | struct notification_thread_state *state, |
1701 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1702 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1703 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1704 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1705 | { |
1706 | struct cds_list_head trigger_list; | |
8abe313a JG |
1707 | struct channel_info *new_channel_info = NULL; |
1708 | struct channel_key channel_key = { | |
1709 | .key = channel_key_int, | |
1710 | .domain = channel_domain, | |
1711 | }; | |
ab0ee2ca JG |
1712 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1713 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1714 | int trigger_count = 0; | |
1715 | struct cds_lfht_iter iter; | |
8abe313a | 1716 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1717 | |
1718 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a | 1719 | channel_name, session_name, channel_key_int, |
526200e4 | 1720 | lttng_domain_type_str(channel_domain)); |
ab0ee2ca JG |
1721 | |
1722 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1723 | ||
8abe313a JG |
1724 | session_info = find_or_create_session_info(state, session_name, |
1725 | session_uid, session_gid); | |
1726 | if (!session_info) { | |
a9577b76 | 1727 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1728 | goto error; |
1729 | } | |
1730 | ||
8abe313a JG |
1731 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1732 | channel_capacity, session_info); | |
1733 | if (!new_channel_info) { | |
1734 | goto error; | |
1735 | } | |
ab0ee2ca | 1736 | |
83b934ad | 1737 | rcu_read_lock(); |
ab0ee2ca JG |
1738 | /* Build a list of all triggers applying to the new channel. */ |
1739 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1740 | node) { | |
1741 | struct lttng_trigger_list_element *new_element; | |
1742 | ||
1743 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1744 | new_channel_info)) { |
ab0ee2ca JG |
1745 | continue; |
1746 | } | |
1747 | ||
1748 | new_element = zmalloc(sizeof(*new_element)); | |
1749 | if (!new_element) { | |
83b934ad | 1750 | rcu_read_unlock(); |
ab0ee2ca JG |
1751 | goto error; |
1752 | } | |
1753 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1754 | new_element->trigger = trigger_ht_element->trigger; | |
1755 | cds_list_add(&new_element->node, &trigger_list); | |
1756 | trigger_count++; | |
1757 | } | |
83b934ad | 1758 | rcu_read_unlock(); |
ab0ee2ca JG |
1759 | |
1760 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1761 | trigger_count); | |
1762 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1763 | if (!channel_trigger_list) { | |
1764 | goto error; | |
1765 | } | |
8abe313a | 1766 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1767 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1768 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1769 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1770 | ||
1771 | rcu_read_lock(); | |
1772 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1773 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1774 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1775 | &new_channel_info->channels_ht_node); |
1776 | /* | |
1777 | * Add the list of triggers associated with this channel to the | |
1778 | * channel_triggers_ht. | |
1779 | */ | |
1780 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1781 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1782 | &channel_trigger_list->channel_triggers_ht_node); |
1783 | rcu_read_unlock(); | |
1eee26c5 | 1784 | session_info_put(session_info); |
ab0ee2ca JG |
1785 | *cmd_result = LTTNG_OK; |
1786 | return 0; | |
1787 | error: | |
ab0ee2ca | 1788 | channel_info_destroy(new_channel_info); |
8abe313a | 1789 | session_info_put(session_info); |
ab0ee2ca JG |
1790 | return 1; |
1791 | } | |
1792 | ||
83b934ad MD |
1793 | static |
1794 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1795 | { | |
1796 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1797 | rcu_node)); | |
1798 | } | |
1799 | ||
1800 | static | |
1801 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1802 | { | |
1803 | free(caa_container_of(node, struct channel_state_sample, | |
1804 | rcu_node)); | |
1805 | } | |
1806 | ||
ab0ee2ca JG |
1807 | static |
1808 | int handle_notification_thread_command_remove_channel( | |
1809 | struct notification_thread_state *state, | |
1810 | uint64_t channel_key, enum lttng_domain_type domain, | |
1811 | enum lttng_error_code *cmd_result) | |
1812 | { | |
1813 | struct cds_lfht_node *node; | |
1814 | struct cds_lfht_iter iter; | |
1815 | struct lttng_channel_trigger_list *trigger_list; | |
1816 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1817 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1818 | struct channel_info *channel_info; | |
1819 | ||
1820 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
526200e4 | 1821 | channel_key, lttng_domain_type_str(domain)); |
ab0ee2ca JG |
1822 | |
1823 | rcu_read_lock(); | |
1824 | ||
1825 | cds_lfht_lookup(state->channel_triggers_ht, | |
1826 | hash_channel_key(&key), | |
1827 | match_channel_trigger_list, | |
1828 | &key, | |
1829 | &iter); | |
1830 | node = cds_lfht_iter_get_node(&iter); | |
1831 | /* | |
1832 | * There is a severe internal error if we are being asked to remove a | |
1833 | * channel that doesn't exist. | |
1834 | */ | |
1835 | if (!node) { | |
1836 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1837 | goto end; | |
1838 | } | |
1839 | ||
1840 | /* Free the list of triggers associated with this channel. */ | |
1841 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1842 | channel_triggers_ht_node); | |
1843 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1844 | &trigger_list->list, node) { | |
1845 | cds_list_del(&trigger_list_element->node); | |
1846 | free(trigger_list_element); | |
1847 | } | |
1848 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1849 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1850 | |
1851 | /* Free sampled channel state. */ | |
1852 | cds_lfht_lookup(state->channel_state_ht, | |
1853 | hash_channel_key(&key), | |
1854 | match_channel_state_sample, | |
1855 | &key, | |
1856 | &iter); | |
1857 | node = cds_lfht_iter_get_node(&iter); | |
1858 | /* | |
1859 | * This is expected to be NULL if the channel is destroyed before we | |
1860 | * received a sample. | |
1861 | */ | |
1862 | if (node) { | |
1863 | struct channel_state_sample *sample = caa_container_of(node, | |
1864 | struct channel_state_sample, | |
1865 | channel_state_ht_node); | |
1866 | ||
1867 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1868 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1869 | } |
1870 | ||
1871 | /* Remove the channel from the channels_ht and free it. */ | |
1872 | cds_lfht_lookup(state->channels_ht, | |
1873 | hash_channel_key(&key), | |
1874 | match_channel_info, | |
1875 | &key, | |
1876 | &iter); | |
1877 | node = cds_lfht_iter_get_node(&iter); | |
1878 | assert(node); | |
1879 | channel_info = caa_container_of(node, struct channel_info, | |
1880 | channels_ht_node); | |
1881 | cds_lfht_del(state->channels_ht, node); | |
1882 | channel_info_destroy(channel_info); | |
1883 | end: | |
1884 | rcu_read_unlock(); | |
1885 | *cmd_result = LTTNG_OK; | |
1886 | return 0; | |
1887 | } | |
1888 | ||
0ca52944 | 1889 | static |
ed327204 | 1890 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1891 | struct notification_thread_state *state, |
ed327204 JG |
1892 | enum notification_thread_command_type cmd_type, |
1893 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1894 | uint64_t trace_archive_chunk_id, | |
1895 | struct lttng_trace_archive_location *location, | |
1896 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1897 | { |
ed327204 JG |
1898 | int ret = 0; |
1899 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1900 | struct lttng_session_trigger_list *trigger_list; | |
1901 | struct lttng_trigger_list_element *trigger_list_element; | |
1902 | struct session_info *session_info; | |
f2b3ef9f | 1903 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1904 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1905 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1906 | }; |
0ca52944 | 1907 | |
ed327204 JG |
1908 | rcu_read_lock(); |
1909 | ||
1910 | session_info = find_or_create_session_info(state, session_name, | |
1911 | session_uid, session_gid); | |
1912 | if (!session_info) { | |
a9577b76 | 1913 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1914 | ret = -1; |
1915 | cmd_result = LTTNG_ERR_NOMEM; | |
1916 | goto end; | |
1917 | } | |
1918 | ||
1919 | session_info->rotation.ongoing = | |
1920 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1921 | session_info->rotation.id = trace_archive_chunk_id; | |
1922 | trigger_list = get_session_trigger_list(state, session_name); | |
1923 | if (!trigger_list) { | |
1924 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1925 | session_name); | |
1926 | goto end; | |
1927 | } | |
1928 | ||
1929 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1930 | node) { | |
1931 | const struct lttng_condition *condition; | |
f2b3ef9f | 1932 | struct lttng_trigger *trigger; |
ed327204 JG |
1933 | struct notification_client_list *client_list; |
1934 | struct lttng_evaluation *evaluation = NULL; | |
1935 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1936 | enum action_executor_status executor_status; |
ed327204 JG |
1937 | |
1938 | trigger = trigger_list_element->trigger; | |
1939 | condition = lttng_trigger_get_const_condition(trigger); | |
1940 | assert(condition); | |
1941 | condition_type = lttng_condition_get_type(condition); | |
1942 | ||
1943 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1944 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1945 | continue; | |
1946 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1947 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1948 | continue; | |
1949 | } | |
1950 | ||
ed327204 | 1951 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1952 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1953 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1954 | trace_archive_chunk_id); | |
1955 | } else { | |
1956 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1957 | trace_archive_chunk_id, location); | |
1958 | } | |
1959 | ||
1960 | if (!evaluation) { | |
1961 | /* Internal error */ | |
1962 | ret = -1; | |
1963 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1964 | goto put_list; |
ed327204 JG |
1965 | } |
1966 | ||
f2b3ef9f JG |
1967 | /* |
1968 | * Ownership of `evaluation` transferred to the action executor | |
1969 | * no matter the result. | |
1970 | */ | |
72365501 JR |
1971 | executor_status = action_executor_enqueue_trigger( |
1972 | state->executor, trigger, evaluation, | |
1973 | &session_creds, client_list); | |
f2b3ef9f JG |
1974 | evaluation = NULL; |
1975 | switch (executor_status) { | |
1976 | case ACTION_EXECUTOR_STATUS_OK: | |
1977 | break; | |
1978 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1979 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1980 | /* | |
1981 | * TODO Add trigger identification (name/id) when | |
1982 | * it is added to the API. | |
1983 | */ | |
1984 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1985 | ret = -1; | |
1986 | goto put_list; | |
1987 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1988 | /* | |
1989 | * TODO Add trigger identification (name/id) when | |
1990 | * it is added to the API. | |
1991 | * | |
1992 | * Not a fatal error. | |
1993 | */ | |
1994 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1995 | ret = 0; | |
1996 | goto put_list; | |
1997 | default: | |
1998 | abort(); | |
1999 | } | |
2000 | ||
505b2d90 JG |
2001 | put_list: |
2002 | notification_client_list_put(client_list); | |
ed327204 | 2003 | if (caa_unlikely(ret)) { |
505b2d90 | 2004 | break; |
ed327204 JG |
2005 | } |
2006 | } | |
2007 | end: | |
2008 | session_info_put(session_info); | |
2009 | *_cmd_result = cmd_result; | |
2010 | rcu_read_unlock(); | |
2011 | return ret; | |
0ca52944 JG |
2012 | } |
2013 | ||
d02d7404 JR |
2014 | static |
2015 | int handle_notification_thread_command_add_tracer_event_source( | |
2016 | struct notification_thread_state *state, | |
2017 | int tracer_event_source_fd, | |
2018 | enum lttng_domain_type domain_type, | |
2019 | enum lttng_error_code *_cmd_result) | |
2020 | { | |
2021 | int ret = 0; | |
2022 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2023 | struct notification_event_tracer_event_source_element *element = NULL; | |
2024 | ||
2025 | element = zmalloc(sizeof(*element)); | |
2026 | if (!element) { | |
2027 | cmd_result = LTTNG_ERR_NOMEM; | |
2028 | ret = -1; | |
2029 | goto end; | |
2030 | } | |
2031 | ||
d02d7404 JR |
2032 | element->fd = tracer_event_source_fd; |
2033 | element->domain = domain_type; | |
2034 | ||
2035 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
2036 | ||
2037 | DBG3("[notification-thread] Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2038 | tracer_event_source_fd, | |
2039 | lttng_domain_type_str(domain_type)); | |
2040 | ||
2041 | /* Adding the read side pipe to the event poll. */ | |
2042 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLIN | LPOLLERR); | |
2043 | if (ret < 0) { | |
2044 | ERR("[notification-thread] Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2045 | tracer_event_source_fd, | |
2046 | lttng_domain_type_str(element->domain)); | |
2047 | cds_list_del(&element->node); | |
2048 | free(element); | |
2049 | goto end; | |
2050 | } | |
2051 | ||
2052 | element->is_fd_in_poll_set = true; | |
2053 | ||
2054 | end: | |
2055 | *_cmd_result = cmd_result; | |
2056 | return ret; | |
2057 | } | |
2058 | ||
8b524060 FD |
2059 | static |
2060 | int drain_event_notifier_notification_pipe( | |
2061 | struct notification_thread_state *state, | |
2062 | int pipe, enum lttng_domain_type domain) | |
2063 | { | |
2064 | struct lttng_poll_event events = {0}; | |
2065 | int ret; | |
2066 | ||
2067 | ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC); | |
2068 | if (ret < 0) { | |
2069 | ERR("[notification-thread] Error creating lttng_poll_event"); | |
2070 | goto end; | |
2071 | } | |
2072 | ||
2073 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2074 | if (ret < 0) { | |
2075 | ERR("[notification-thread] Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", | |
2076 | pipe); | |
2077 | goto end; | |
2078 | } | |
2079 | ||
2080 | while (true) { | |
2081 | /* | |
2082 | * Continue to consume notifications as long as there are new | |
2083 | * ones coming in. The tracer has been asked to stop producing | |
2084 | * them. | |
2085 | * | |
2086 | * LPOLLIN is explicitly checked since LPOLLHUP is implicitly | |
2087 | * monitored (on Linux, at least) and will be returned when | |
2088 | * the pipe is closed but empty. | |
2089 | */ | |
2090 | ret = lttng_poll_wait_interruptible(&events, 0); | |
a17b133b | 2091 | if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) { |
8b524060 FD |
2092 | /* No more notification to be read on this pipe. */ |
2093 | ret = 0; | |
2094 | goto end; | |
2095 | } else if (ret < 0) { | |
2096 | PERROR("Failed on lttng_poll_wait_interruptible() call"); | |
2097 | ret = -1; | |
2098 | goto end; | |
2099 | } | |
2100 | ||
2101 | ret = handle_one_event_notifier_notification(state, pipe, domain); | |
2102 | if (ret) { | |
2103 | ERR("[notification-thread] Error consuming an event notifier notification from pipe: fd = %d", | |
2104 | pipe); | |
2105 | } | |
2106 | } | |
2107 | end: | |
2108 | lttng_poll_clean(&events); | |
2109 | return ret; | |
2110 | } | |
2111 | ||
d02d7404 JR |
2112 | static |
2113 | int handle_notification_thread_command_remove_tracer_event_source( | |
2114 | struct notification_thread_state *state, | |
2115 | int tracer_event_source_fd, | |
2116 | enum lttng_error_code *_cmd_result) | |
2117 | { | |
2118 | int ret = 0; | |
2fb5e9b7 | 2119 | bool found = false; |
d02d7404 JR |
2120 | enum lttng_error_code cmd_result = LTTNG_OK; |
2121 | struct notification_event_tracer_event_source_element *source_element = NULL, *tmp; | |
2122 | ||
2123 | cds_list_for_each_entry_safe(source_element, tmp, | |
2124 | &state->tracer_event_sources_list, node) { | |
2125 | if (source_element->fd != tracer_event_source_fd) { | |
2126 | continue; | |
2127 | } | |
2128 | ||
2129 | DBG("[notification-thread] Removed tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2130 | tracer_event_source_fd, | |
2131 | lttng_domain_type_str(source_element->domain)); | |
2132 | cds_list_del(&source_element->node); | |
2fb5e9b7 | 2133 | found = true; |
d02d7404 JR |
2134 | break; |
2135 | } | |
2136 | ||
2fb5e9b7 JG |
2137 | if (!found) { |
2138 | /* | |
2139 | * This is temporarily allowed since the poll activity set is | |
2140 | * not properly cleaned-up for the moment. This is adressed in | |
2141 | * an upcoming fix. | |
2142 | */ | |
2143 | source_element = NULL; | |
2144 | goto end; | |
2145 | } | |
d02d7404 JR |
2146 | |
2147 | if (!source_element->is_fd_in_poll_set) { | |
2148 | /* Skip the poll set removal. */ | |
2149 | goto end; | |
2150 | } | |
2151 | ||
2152 | DBG3("[notification-thread] Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2153 | tracer_event_source_fd, | |
2154 | lttng_domain_type_str(source_element->domain)); | |
2155 | ||
2156 | /* Removing the fd from the event poll set. */ | |
2157 | ret = lttng_poll_del(&state->events, tracer_event_source_fd); | |
2158 | if (ret < 0) { | |
2159 | ERR("[notification-thread] Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2160 | tracer_event_source_fd, | |
2161 | lttng_domain_type_str(source_element->domain)); | |
2162 | cmd_result = LTTNG_ERR_FATAL; | |
2163 | goto end; | |
2164 | } | |
2165 | ||
173900f6 JG |
2166 | source_element->is_fd_in_poll_set = false; |
2167 | ||
8b524060 FD |
2168 | ret = drain_event_notifier_notification_pipe(state, tracer_event_source_fd, |
2169 | source_element->domain); | |
2170 | if (ret) { | |
2171 | ERR("[notification-thread] Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", | |
2172 | tracer_event_source_fd, | |
2173 | lttng_domain_type_str(source_element->domain)); | |
2174 | cmd_result = LTTNG_ERR_FATAL; | |
2175 | goto end; | |
2176 | } | |
2177 | ||
2178 | /* | |
2179 | * The drain_event_notifier_notification_pipe() call might have read | |
2180 | * data from an fd that we received in event in the latest _poll_wait() | |
2181 | * call. Make sure the thread call poll_wait() again to ensure we have | |
2182 | * a clean state. | |
2183 | */ | |
2184 | state->restart_poll = true; | |
2185 | ||
d02d7404 JR |
2186 | end: |
2187 | free(source_element); | |
2188 | *_cmd_result = cmd_result; | |
2189 | return ret; | |
2190 | } | |
2191 | ||
2192 | int handle_notification_thread_remove_tracer_event_source_no_result( | |
2193 | struct notification_thread_state *state, | |
2194 | int tracer_event_source_fd) | |
2195 | { | |
2196 | int ret; | |
2197 | enum lttng_error_code cmd_result; | |
2198 | ||
2199 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2200 | state, tracer_event_source_fd, &cmd_result); | |
2201 | (void) cmd_result; | |
2202 | return ret; | |
2203 | } | |
2204 | ||
fbc9f37d JR |
2205 | static int handle_notification_thread_command_list_triggers( |
2206 | struct notification_thread_handle *handle, | |
2207 | struct notification_thread_state *state, | |
2208 | uid_t client_uid, | |
2209 | struct lttng_triggers **triggers, | |
2210 | enum lttng_error_code *_cmd_result) | |
2211 | { | |
2212 | int ret = 0; | |
2213 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2214 | struct cds_lfht_iter iter; | |
2215 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2216 | struct lttng_triggers *local_triggers = NULL; | |
2217 | const struct lttng_credentials *creds; | |
2218 | ||
2219 | rcu_read_lock(); | |
2220 | ||
2221 | local_triggers = lttng_triggers_create(); | |
2222 | if (!local_triggers) { | |
2223 | /* Not a fatal error. */ | |
2224 | cmd_result = LTTNG_ERR_NOMEM; | |
2225 | goto end; | |
2226 | } | |
2227 | ||
2228 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2229 | trigger_ht_element, node) { | |
2230 | /* | |
2231 | * Only return the triggers to which the client has access. | |
2232 | * The root user has visibility over all triggers. | |
2233 | */ | |
2234 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2235 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2236 | continue; | |
2237 | } | |
2238 | ||
2239 | ret = lttng_triggers_add(local_triggers, | |
2240 | trigger_ht_element->trigger); | |
2241 | if (ret < 0) { | |
2242 | /* Not a fatal error. */ | |
2243 | ret = 0; | |
2244 | cmd_result = LTTNG_ERR_NOMEM; | |
2245 | goto end; | |
2246 | } | |
2247 | } | |
2248 | ||
2249 | /* Transferring ownership to the caller. */ | |
2250 | *triggers = local_triggers; | |
2251 | local_triggers = NULL; | |
2252 | ||
2253 | end: | |
2254 | rcu_read_unlock(); | |
2255 | lttng_triggers_destroy(local_triggers); | |
2256 | *_cmd_result = cmd_result; | |
2257 | return ret; | |
2258 | } | |
2259 | ||
8790759c FD |
2260 | static inline void get_trigger_info_for_log(const struct lttng_trigger *trigger, |
2261 | const char **trigger_name, | |
2262 | uid_t *trigger_owner_uid) | |
2263 | { | |
2264 | enum lttng_trigger_status trigger_status; | |
2265 | ||
2266 | trigger_status = lttng_trigger_get_name(trigger, trigger_name); | |
2267 | switch (trigger_status) { | |
2268 | case LTTNG_TRIGGER_STATUS_OK: | |
2269 | break; | |
2270 | case LTTNG_TRIGGER_STATUS_UNSET: | |
0efb2ad7 | 2271 | *trigger_name = "(anonymous)"; |
8790759c FD |
2272 | break; |
2273 | default: | |
2274 | abort(); | |
2275 | } | |
2276 | ||
2277 | trigger_status = lttng_trigger_get_owner_uid(trigger, | |
2278 | trigger_owner_uid); | |
2279 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
2280 | } | |
2281 | ||
2282 | static int handle_notification_thread_command_get_trigger( | |
2283 | struct notification_thread_state *state, | |
2284 | const struct lttng_trigger *trigger, | |
2285 | struct lttng_trigger **registered_trigger, | |
2286 | enum lttng_error_code *_cmd_result) | |
2287 | { | |
2288 | int ret = -1; | |
2289 | struct cds_lfht_iter iter; | |
2290 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2291 | enum lttng_error_code cmd_result = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2292 | const char *trigger_name; | |
2293 | uid_t trigger_owner_uid; | |
2294 | ||
2295 | rcu_read_lock(); | |
2296 | ||
2297 | cds_lfht_for_each_entry( | |
2298 | state->triggers_ht, &iter, trigger_ht_element, node) { | |
2299 | if (lttng_trigger_is_equal( | |
2300 | trigger, trigger_ht_element->trigger)) { | |
2301 | /* Take one reference on the return trigger. */ | |
2302 | *registered_trigger = trigger_ht_element->trigger; | |
2303 | lttng_trigger_get(*registered_trigger); | |
2304 | ret = 0; | |
2305 | cmd_result = LTTNG_OK; | |
2306 | goto end; | |
2307 | } | |
2308 | } | |
2309 | ||
2310 | /* Not a fatal error if the trigger is not found. */ | |
2311 | get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid); | |
87661585 | 2312 | DBG("Failed to retrieve registered version of trigger: trigger name = '%s', trigger owner uid = %d", |
8790759c FD |
2313 | trigger_name, (int) trigger_owner_uid); |
2314 | ||
2315 | ret = 0; | |
2316 | ||
2317 | end: | |
2318 | rcu_read_unlock(); | |
2319 | *_cmd_result = cmd_result; | |
2320 | return ret; | |
2321 | } | |
2322 | ||
1da26331 | 2323 | static |
959e3c66 | 2324 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2325 | { |
959e3c66 | 2326 | bool is_supported; |
1da26331 JG |
2327 | |
2328 | switch (lttng_condition_get_type(condition)) { | |
2329 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2330 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2331 | { | |
959e3c66 | 2332 | int ret; |
1da26331 JG |
2333 | enum lttng_domain_type domain; |
2334 | ||
2335 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2336 | &domain); | |
959e3c66 | 2337 | assert(ret == 0); |
1da26331 JG |
2338 | |
2339 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2340 | is_supported = true; |
1da26331 JG |
2341 | goto end; |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Older kernel tracers don't expose the API to monitor their | |
2346 | * buffers. Therefore, we reject triggers that require that | |
2347 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2348 | * |
2349 | * Assume unsupported on error. | |
1da26331 | 2350 | */ |
959e3c66 JR |
2351 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2352 | break; | |
2353 | } | |
8dbb86b8 | 2354 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 JR |
2355 | { |
2356 | const struct lttng_event_rule *event_rule; | |
2357 | enum lttng_domain_type domain; | |
2358 | const enum lttng_condition_status status = | |
8dbb86b8 | 2359 | lttng_condition_event_rule_matches_get_rule( |
959e3c66 JR |
2360 | condition, &event_rule); |
2361 | ||
2362 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
2363 | ||
2364 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2365 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2366 | is_supported = true; | |
2367 | goto end; | |
2368 | } | |
2369 | ||
2370 | /* | |
2371 | * Older kernel tracers can't emit notification. Therefore, we | |
2372 | * reject triggers that require that mechanism to be available | |
2373 | * to be evaluated. | |
2374 | * | |
2375 | * Assume unsupported on error. | |
2376 | */ | |
2377 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2378 | break; |
2379 | } | |
2380 | default: | |
959e3c66 | 2381 | is_supported = true; |
1da26331 JG |
2382 | } |
2383 | end: | |
959e3c66 | 2384 | return is_supported; |
1da26331 JG |
2385 | } |
2386 | ||
51eab943 JG |
2387 | /* Must be called with RCU read lock held. */ |
2388 | static | |
f2b3ef9f | 2389 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2390 | struct notification_thread_state *state) |
2391 | { | |
2392 | int ret = 0; | |
51eab943 JG |
2393 | const struct lttng_condition *condition; |
2394 | const char *session_name; | |
2395 | struct lttng_session_trigger_list *trigger_list; | |
2396 | ||
2397 | condition = lttng_trigger_get_const_condition(trigger); | |
2398 | switch (lttng_condition_get_type(condition)) { | |
2399 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2400 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2401 | { | |
2402 | enum lttng_condition_status status; | |
2403 | ||
2404 | status = lttng_condition_session_rotation_get_session_name( | |
2405 | condition, &session_name); | |
2406 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
2407 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
2408 | ret = -1; | |
2409 | goto end; | |
2410 | } | |
2411 | break; | |
2412 | } | |
2413 | default: | |
2414 | ret = -1; | |
2415 | goto end; | |
2416 | } | |
2417 | ||
ed327204 JG |
2418 | trigger_list = get_session_trigger_list(state, session_name); |
2419 | if (!trigger_list) { | |
51eab943 JG |
2420 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
2421 | session_name); | |
2422 | goto end; | |
51eab943 | 2423 | |
ed327204 | 2424 | } |
51eab943 JG |
2425 | |
2426 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
2427 | session_name); | |
2428 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2429 | end: | |
2430 | return ret; | |
2431 | } | |
2432 | ||
2433 | /* Must be called with RCU read lock held. */ | |
2434 | static | |
f2b3ef9f | 2435 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2436 | struct notification_thread_state *state) |
2437 | { | |
2438 | int ret = 0; | |
2439 | struct cds_lfht_node *node; | |
2440 | struct cds_lfht_iter iter; | |
2441 | struct channel_info *channel; | |
2442 | ||
2443 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2444 | channels_ht_node) { | |
2445 | struct lttng_trigger_list_element *trigger_list_element; | |
2446 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2447 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2448 | |
2449 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2450 | continue; | |
2451 | } | |
2452 | ||
2453 | cds_lfht_lookup(state->channel_triggers_ht, | |
2454 | hash_channel_key(&channel->key), | |
2455 | match_channel_trigger_list, | |
2456 | &channel->key, | |
a5d64ae7 MD |
2457 | &lookup_iter); |
2458 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2459 | assert(node); |
2460 | trigger_list = caa_container_of(node, | |
2461 | struct lttng_channel_trigger_list, | |
2462 | channel_triggers_ht_node); | |
2463 | ||
2464 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2465 | if (!trigger_list_element) { | |
2466 | ret = -1; | |
2467 | goto end; | |
2468 | } | |
2469 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2470 | trigger_list_element->trigger = trigger; | |
2471 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2472 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2473 | channel->name); | |
2474 | } | |
2475 | end: | |
2476 | return ret; | |
2477 | } | |
2478 | ||
f2b3ef9f JG |
2479 | static |
2480 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2481 | { | |
2482 | bool is_notify = false; | |
2483 | unsigned int i, count; | |
2484 | enum lttng_action_status action_status; | |
2485 | const struct lttng_action *action = | |
2486 | lttng_trigger_get_const_action(trigger); | |
2487 | enum lttng_action_type action_type; | |
2488 | ||
2489 | assert(action); | |
17182cfd | 2490 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2491 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2492 | is_notify = true; | |
2493 | goto end; | |
7c2fae7c | 2494 | } else if (action_type != LTTNG_ACTION_TYPE_LIST) { |
f2b3ef9f JG |
2495 | goto end; |
2496 | } | |
2497 | ||
702f26c8 | 2498 | action_status = lttng_action_list_get_count(action, &count); |
f2b3ef9f JG |
2499 | assert(action_status == LTTNG_ACTION_STATUS_OK); |
2500 | ||
2501 | for (i = 0; i < count; i++) { | |
2502 | const struct lttng_action *inner_action = | |
702f26c8 | 2503 | lttng_action_list_get_at_index( |
f2b3ef9f JG |
2504 | action, i); |
2505 | ||
17182cfd | 2506 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2507 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2508 | is_notify = true; | |
2509 | goto end; | |
2510 | } | |
2511 | } | |
2512 | ||
2513 | end: | |
2514 | return is_notify; | |
2515 | } | |
2516 | ||
242388e4 JR |
2517 | static bool trigger_name_taken(struct notification_thread_state *state, |
2518 | const struct lttng_trigger *trigger) | |
2519 | { | |
2520 | struct cds_lfht_iter iter; | |
2521 | ||
2522 | /* | |
2523 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2524 | * The match is done against the trigger name and uid. | |
2525 | */ | |
2526 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2527 | hash_trigger_by_name_uid(trigger), | |
2528 | match_trigger_by_name_uid, | |
2529 | trigger, | |
2530 | &iter); | |
2531 | return !!cds_lfht_iter_get_node(&iter); | |
2532 | } | |
2533 | ||
2534 | static | |
2535 | enum lttng_error_code generate_trigger_name( | |
2536 | struct notification_thread_state *state, | |
2537 | struct lttng_trigger *trigger, const char **name) | |
2538 | { | |
2539 | enum lttng_error_code ret_code = LTTNG_OK; | |
2540 | bool taken = false; | |
2541 | enum lttng_trigger_status status; | |
2542 | ||
2543 | do { | |
2544 | const int ret = lttng_trigger_generate_name(trigger, | |
2545 | state->trigger_id.name_offset++); | |
2546 | if (ret) { | |
2547 | /* The only reason this can fail right now. */ | |
2548 | ret_code = LTTNG_ERR_NOMEM; | |
2549 | break; | |
2550 | } | |
2551 | ||
2552 | status = lttng_trigger_get_name(trigger, name); | |
2553 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
2554 | ||
2555 | taken = trigger_name_taken(state, trigger); | |
2556 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2557 | ||
2558 | return ret_code; | |
2559 | } | |
2560 | ||
2758e38b FD |
2561 | static inline |
2562 | void notif_thread_state_remove_trigger_ht_elem( | |
2563 | struct notification_thread_state *state, | |
2564 | struct lttng_trigger_ht_element *trigger_ht_element) | |
2565 | { | |
2566 | assert(state); | |
2567 | assert(trigger_ht_element); | |
2568 | ||
2569 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2570 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); | |
2571 | } | |
2572 | ||
6487ad53 FD |
2573 | static |
2574 | enum lttng_error_code setup_tracer_notifier( | |
2575 | struct notification_thread_state *state, | |
2576 | struct lttng_trigger *trigger) | |
2577 | { | |
2578 | enum lttng_error_code ret; | |
2579 | enum event_notifier_error_accounting_status error_accounting_status; | |
2580 | struct cds_lfht_node *node; | |
2581 | uint64_t error_counter_index = 0; | |
2582 | struct lttng_condition *condition = lttng_trigger_get_condition(trigger); | |
2583 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; | |
2584 | ||
2585 | trigger_tokens_ht_element = zmalloc(sizeof(*trigger_tokens_ht_element)); | |
2586 | if (!trigger_tokens_ht_element) { | |
2587 | ret = LTTNG_ERR_NOMEM; | |
2588 | goto end; | |
2589 | } | |
2590 | ||
2591 | /* Add trigger token to the trigger_tokens_ht. */ | |
2592 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2593 | trigger_tokens_ht_element->token = LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2594 | trigger_tokens_ht_element->trigger = trigger; | |
2595 | ||
2596 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2597 | hash_key_u64(&trigger_tokens_ht_element->token, lttng_ht_seed), | |
2598 | match_trigger_token, | |
2599 | &trigger_tokens_ht_element->token, | |
2600 | &trigger_tokens_ht_element->node); | |
2601 | if (node != &trigger_tokens_ht_element->node) { | |
2602 | ret = LTTNG_ERR_TRIGGER_EXISTS; | |
2603 | goto error_free_ht_element; | |
2604 | } | |
2605 | ||
2606 | error_accounting_status = event_notifier_error_accounting_register_event_notifier( | |
2607 | trigger, &error_counter_index); | |
2608 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2609 | if (error_accounting_status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE) { | |
7c2fae7c | 2610 | DBG("Trigger list error accounting counter full."); |
6487ad53 FD |
2611 | ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING_FULL; |
2612 | } else { | |
2613 | ERR("Error registering trigger for error accounting"); | |
2614 | ret = LTTNG_ERR_EVENT_NOTIFIER_REGISTRATION; | |
2615 | } | |
2616 | ||
2617 | goto error_remove_ht_element; | |
2618 | } | |
2619 | ||
8dbb86b8 | 2620 | lttng_condition_event_rule_matches_set_error_counter_index( |
6487ad53 FD |
2621 | condition, error_counter_index); |
2622 | ||
2623 | ret = LTTNG_OK; | |
2624 | goto end; | |
2625 | ||
2626 | error_remove_ht_element: | |
2627 | cds_lfht_del(state->trigger_tokens_ht, &trigger_tokens_ht_element->node); | |
2628 | error_free_ht_element: | |
2629 | free(trigger_tokens_ht_element); | |
2630 | end: | |
2631 | return ret; | |
2632 | } | |
2633 | ||
ab0ee2ca | 2634 | /* |
f2b3ef9f | 2635 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2636 | * |
1da26331 | 2637 | * The effects of this are benign since: |
ab0ee2ca | 2638 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2639 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2640 | * - The notifications will not be sent since the client's credentials |
2641 | * are checked against the channel at that moment. | |
1da26331 JG |
2642 | * |
2643 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2644 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2645 | * |
2646 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2647 | * error code. | |
ab0ee2ca JG |
2648 | */ |
2649 | static | |
2650 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2651 | struct notification_thread_state *state, |
2652 | struct lttng_trigger *trigger, | |
0efb2ad7 | 2653 | bool is_trigger_anonymous, |
8abe313a | 2654 | enum lttng_error_code *cmd_result) |
ab0ee2ca JG |
2655 | { |
2656 | int ret = 0; | |
2657 | struct lttng_condition *condition; | |
ab0ee2ca JG |
2658 | struct notification_client_list *client_list = NULL; |
2659 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
ab0ee2ca | 2660 | struct cds_lfht_node *node; |
242388e4 | 2661 | const char* trigger_name; |
ab0ee2ca | 2662 | bool free_trigger = true; |
f2b3ef9f JG |
2663 | struct lttng_evaluation *evaluation = NULL; |
2664 | struct lttng_credentials object_creds; | |
ff588497 JR |
2665 | uid_t object_uid; |
2666 | gid_t object_gid; | |
f2b3ef9f | 2667 | enum action_executor_status executor_status; |
e6887944 JR |
2668 | const uint64_t trigger_tracer_token = |
2669 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2670 | |
2671 | rcu_read_lock(); | |
2672 | ||
e6887944 JR |
2673 | /* Set the trigger's tracer token. */ |
2674 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2675 | ||
0efb2ad7 JG |
2676 | if (!is_trigger_anonymous) { |
2677 | if (lttng_trigger_get_name(trigger, &trigger_name) == | |
2678 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2679 | const enum lttng_error_code ret_code = | |
2680 | generate_trigger_name(state, trigger, | |
2681 | &trigger_name); | |
242388e4 | 2682 | |
0efb2ad7 JG |
2683 | if (ret_code != LTTNG_OK) { |
2684 | /* Fatal error. */ | |
2685 | ret = -1; | |
2686 | *cmd_result = ret_code; | |
2687 | goto error; | |
2688 | } | |
2689 | } else if (trigger_name_taken(state, trigger)) { | |
2690 | /* Not a fatal error. */ | |
2691 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2692 | ret = 0; | |
242388e4 JR |
2693 | goto error; |
2694 | } | |
0efb2ad7 JG |
2695 | } else { |
2696 | trigger_name = "(anonymous)"; | |
242388e4 JR |
2697 | } |
2698 | ||
ab0ee2ca | 2699 | condition = lttng_trigger_get_condition(trigger); |
1da26331 JG |
2700 | assert(condition); |
2701 | ||
959e3c66 JR |
2702 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2703 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2704 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2705 | goto error; | |
1da26331 JG |
2706 | } |
2707 | ||
ab0ee2ca JG |
2708 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2709 | if (!trigger_ht_element) { | |
2710 | ret = -1; | |
2711 | goto error; | |
2712 | } | |
2713 | ||
2714 | /* Add trigger to the trigger_ht. */ | |
2715 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2716 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2717 | trigger_ht_element->trigger = trigger; |
2718 | ||
2719 | node = cds_lfht_add_unique(state->triggers_ht, | |
2720 | lttng_condition_hash(condition), | |
242388e4 JR |
2721 | match_trigger, |
2722 | trigger, | |
ab0ee2ca JG |
2723 | &trigger_ht_element->node); |
2724 | if (node != &trigger_ht_element->node) { | |
2725 | /* Not a fatal error, simply report it to the client. */ | |
2726 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2727 | goto error_free_ht_element; | |
2728 | } | |
2729 | ||
242388e4 JR |
2730 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2731 | hash_trigger_by_name_uid(trigger), | |
2732 | match_trigger_by_name_uid, | |
2733 | trigger, | |
2734 | &trigger_ht_element->node_by_name_uid); | |
2735 | if (node != &trigger_ht_element->node_by_name_uid) { | |
75e540c6 JG |
2736 | /* Internal error: add to triggers_ht should have failed. */ |
2737 | ret = -1; | |
242388e4 JR |
2738 | goto error_free_ht_element; |
2739 | } | |
2740 | ||
9c374932 JR |
2741 | /* From this point consider the trigger registered. */ |
2742 | lttng_trigger_set_as_registered(trigger); | |
2743 | ||
6487ad53 FD |
2744 | /* |
2745 | * Some triggers might need a tracer notifier depending on its | |
2746 | * condition and actions. | |
2747 | */ | |
2748 | if (lttng_trigger_needs_tracer_notifier(trigger)) { | |
2749 | enum lttng_error_code error_code; | |
e7c93cf9 | 2750 | |
6487ad53 FD |
2751 | error_code = setup_tracer_notifier(state, trigger); |
2752 | if (error_code != LTTNG_OK) { | |
2758e38b FD |
2753 | notif_thread_state_remove_trigger_ht_elem(state, |
2754 | trigger_ht_element); | |
6487ad53 FD |
2755 | if (error_code == LTTNG_ERR_NOMEM) { |
2756 | ret = -1; | |
2757 | } else { | |
2758 | *cmd_result = error_code; | |
2759 | ret = 0; | |
90aa04a1 FD |
2760 | } |
2761 | ||
6487ad53 | 2762 | goto error_free_ht_element; |
90aa04a1 | 2763 | } |
e7c93cf9 JR |
2764 | } |
2765 | ||
ab0ee2ca JG |
2766 | /* |
2767 | * The rest only applies to triggers that have a "notify" action. | |
2768 | * It is not skipped as this is the only action type currently | |
2769 | * supported. | |
2770 | */ | |
f2b3ef9f | 2771 | if (is_trigger_action_notify(trigger)) { |
091fa780 FD |
2772 | /* |
2773 | * Find or create the client list of this condition. It may | |
2774 | * already be present if another trigger is already registered | |
2775 | * with the same condition. | |
2776 | */ | |
2777 | client_list = get_client_list_from_condition(state, condition); | |
f2b3ef9f | 2778 | if (!client_list) { |
091fa780 FD |
2779 | /* |
2780 | * No client list for this condition yet. We create new | |
2781 | * one and build it up. | |
2782 | */ | |
2783 | client_list = notification_client_list_create(state, condition); | |
2784 | if (!client_list) { | |
2785 | ERR("Error creating notification client list for trigger %s", trigger->name); | |
2786 | goto error_free_ht_element; | |
f2b3ef9f | 2787 | } |
ab0ee2ca | 2788 | } |
f2b3ef9f | 2789 | |
091fa780 FD |
2790 | CDS_INIT_LIST_HEAD(&trigger_ht_element->client_list_trigger_node); |
2791 | ||
2792 | pthread_mutex_lock(&client_list->lock); | |
2793 | cds_list_add(&trigger_ht_element->client_list_trigger_node, &client_list->triggers_list); | |
2794 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca JG |
2795 | } |
2796 | ||
091fa780 FD |
2797 | /* |
2798 | * Ownership of the trigger and of its wrapper was transfered to | |
2799 | * the triggers_ht. Same for token ht element if necessary. | |
2800 | */ | |
2801 | trigger_ht_element = NULL; | |
2802 | free_trigger = false; | |
2803 | ||
f82f93a1 | 2804 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2805 | case LTTNG_OBJECT_TYPE_SESSION: |
2806 | /* Add the trigger to the list if it matches a known session. */ | |
2807 | ret = bind_trigger_to_matching_session(trigger, state); | |
2808 | if (ret) { | |
091fa780 | 2809 | goto error_free_ht_element; |
ab0ee2ca | 2810 | } |
f82f93a1 | 2811 | break; |
51eab943 JG |
2812 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2813 | /* | |
2814 | * Add the trigger to list of triggers bound to the channels | |
2815 | * currently known. | |
2816 | */ | |
2817 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2818 | if (ret) { | |
091fa780 | 2819 | goto error_free_ht_element; |
ab0ee2ca | 2820 | } |
51eab943 JG |
2821 | break; |
2822 | case LTTNG_OBJECT_TYPE_NONE: | |
2823 | break; | |
2824 | default: | |
f2b3ef9f | 2825 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2826 | ret = -1; |
091fa780 | 2827 | goto error_free_ht_element; |
ab0ee2ca JG |
2828 | } |
2829 | ||
2ae99f0b | 2830 | /* |
f2b3ef9f JG |
2831 | * The new trigger's condition must be evaluated against the current |
2832 | * state. | |
2833 | * | |
2834 | * In the case of `notify` action, nothing preventing clients from | |
2835 | * subscribing to a condition before the corresponding trigger is | |
2836 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2837 | * |
2838 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2839 | * reception of a channel sample) to evaluate this new condition, but | |
2840 | * that was broken. | |
2841 | * | |
2842 | * The reason it was broken is that waiting for the next sample | |
2843 | * does not allow us to properly handle transitions for edge-triggered | |
2844 | * conditions. | |
2845 | * | |
2846 | * Consider this example: when we handle a new channel sample, we | |
2847 | * evaluate each conditions twice: once with the previous state, and | |
2848 | * again with the newest state. We then use those two results to | |
2849 | * determine whether a state change happened: a condition was false and | |
2850 | * became true. If a state change happened, we have to notify clients. | |
2851 | * | |
2852 | * Now, if a client subscribes to a given notification and registers | |
2853 | * a trigger *after* that subscription, we have to make sure the | |
2854 | * condition is evaluated at this point while considering only the | |
2855 | * current state. Otherwise, the next evaluation cycle may only see | |
2856 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2857 | * the client will never know that the condition has been met. | |
2858 | */ | |
f2b3ef9f JG |
2859 | switch (get_condition_binding_object(condition)) { |
2860 | case LTTNG_OBJECT_TYPE_SESSION: | |
2861 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2862 | &evaluation, &object_uid, |
2863 | &object_gid); | |
bc8daafb JG |
2864 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2865 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2866 | break; |
f2b3ef9f JG |
2867 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2868 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2869 | &evaluation, &object_uid, |
2870 | &object_gid); | |
bc8daafb JG |
2871 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2872 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2873 | break; |
2874 | case LTTNG_OBJECT_TYPE_NONE: | |
2875 | ret = 0; | |
242388e4 | 2876 | break; |
f2b3ef9f JG |
2877 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2878 | default: | |
2879 | ret = -1; | |
242388e4 | 2880 | break; |
f2b3ef9f JG |
2881 | } |
2882 | ||
2883 | if (ret) { | |
2884 | /* Fatal error. */ | |
091fa780 | 2885 | goto error_free_ht_element; |
f2b3ef9f JG |
2886 | } |
2887 | ||
2888 | DBG("Newly registered trigger's condition evaluated to %s", | |
2889 | evaluation ? "true" : "false"); | |
2890 | if (!evaluation) { | |
2891 | /* Evaluation yielded nothing. Normal exit. */ | |
2892 | ret = 0; | |
091fa780 | 2893 | goto success; |
2ae99f0b JG |
2894 | } |
2895 | ||
2896 | /* | |
f2b3ef9f JG |
2897 | * Ownership of `evaluation` transferred to the action executor |
2898 | * no matter the result. | |
2ae99f0b | 2899 | */ |
72365501 JR |
2900 | executor_status = action_executor_enqueue_trigger(state->executor, |
2901 | trigger, evaluation, &object_creds, client_list); | |
f2b3ef9f JG |
2902 | evaluation = NULL; |
2903 | switch (executor_status) { | |
2904 | case ACTION_EXECUTOR_STATUS_OK: | |
2905 | break; | |
2906 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2907 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2908 | /* | |
2909 | * TODO Add trigger identification (name/id) when | |
2910 | * it is added to the API. | |
2911 | */ | |
2912 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2913 | ret = -1; | |
091fa780 | 2914 | goto error_free_ht_element; |
f2b3ef9f JG |
2915 | case ACTION_EXECUTOR_STATUS_OVERFLOW: |
2916 | /* | |
2917 | * TODO Add trigger identification (name/id) when | |
2918 | * it is added to the API. | |
2919 | * | |
2920 | * Not a fatal error. | |
2921 | */ | |
2922 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2923 | ret = 0; | |
091fa780 | 2924 | goto success; |
f2b3ef9f JG |
2925 | default: |
2926 | abort(); | |
2927 | } | |
2ae99f0b | 2928 | |
091fa780 | 2929 | success: |
ab0ee2ca | 2930 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2931 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2932 | trigger_name, trigger_tracer_token); | |
091fa780 | 2933 | goto end; |
505b2d90 | 2934 | |
ab0ee2ca | 2935 | error_free_ht_element: |
242388e4 JR |
2936 | if (trigger_ht_element) { |
2937 | /* Delayed removal due to RCU constraint on delete. */ | |
2938 | call_rcu(&trigger_ht_element->rcu_node, | |
2939 | free_lttng_trigger_ht_element_rcu); | |
2940 | } | |
ab0ee2ca JG |
2941 | error: |
2942 | if (free_trigger) { | |
9c374932 JR |
2943 | /* |
2944 | * Other objects might have a reference to the trigger, mark it | |
2945 | * as unregistered. | |
2946 | */ | |
2947 | lttng_trigger_set_as_unregistered(trigger); | |
ab0ee2ca JG |
2948 | lttng_trigger_destroy(trigger); |
2949 | } | |
091fa780 | 2950 | end: |
ab0ee2ca JG |
2951 | rcu_read_unlock(); |
2952 | return ret; | |
2953 | } | |
2954 | ||
83b934ad MD |
2955 | static |
2956 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2957 | { | |
2958 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2959 | rcu_node)); | |
2960 | } | |
2961 | ||
e7c93cf9 JR |
2962 | static |
2963 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
2964 | { | |
2965 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
2966 | rcu_node)); | |
2967 | } | |
2968 | ||
6487ad53 FD |
2969 | static |
2970 | void teardown_tracer_notifier(struct notification_thread_state *state, | |
2971 | const struct lttng_trigger *trigger) | |
2972 | { | |
2973 | struct cds_lfht_iter iter; | |
2974 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element; | |
2975 | ||
2976 | cds_lfht_for_each_entry(state->trigger_tokens_ht, &iter, | |
2977 | trigger_tokens_ht_element, node) { | |
2978 | ||
2979 | if (!lttng_trigger_is_equal(trigger, | |
2980 | trigger_tokens_ht_element->trigger)) { | |
2981 | continue; | |
2982 | } | |
2983 | ||
2984 | event_notifier_error_accounting_unregister_event_notifier( | |
2985 | trigger_tokens_ht_element->trigger); | |
2986 | ||
2987 | /* TODO talk to all app and remove it */ | |
2988 | DBG("[notification-thread] Removed trigger from tokens_ht"); | |
2989 | cds_lfht_del(state->trigger_tokens_ht, | |
2990 | &trigger_tokens_ht_element->node); | |
2991 | ||
2992 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
2993 | free_notification_trigger_tokens_ht_element_rcu); | |
2994 | ||
2995 | break; | |
2996 | } | |
2997 | } | |
2998 | ||
cc2295b5 | 2999 | static |
ab0ee2ca JG |
3000 | int handle_notification_thread_command_unregister_trigger( |
3001 | struct notification_thread_state *state, | |
ac16173e | 3002 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
3003 | enum lttng_error_code *_cmd_reply) |
3004 | { | |
3005 | struct cds_lfht_iter iter; | |
ed327204 | 3006 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
3007 | struct lttng_channel_trigger_list *trigger_list; |
3008 | struct notification_client_list *client_list; | |
ab0ee2ca | 3009 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 3010 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 3011 | trigger); |
ab0ee2ca JG |
3012 | enum lttng_error_code cmd_reply; |
3013 | ||
3014 | rcu_read_lock(); | |
3015 | ||
3016 | cds_lfht_lookup(state->triggers_ht, | |
3017 | lttng_condition_hash(condition), | |
242388e4 JR |
3018 | match_trigger, |
3019 | trigger, | |
ab0ee2ca JG |
3020 | &iter); |
3021 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
3022 | if (!triggers_ht_node) { | |
3023 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
3024 | goto end; | |
3025 | } else { | |
3026 | cmd_reply = LTTNG_OK; | |
3027 | } | |
3028 | ||
9c374932 JR |
3029 | trigger_ht_element = caa_container_of(triggers_ht_node, |
3030 | struct lttng_trigger_ht_element, node); | |
3031 | ||
ab0ee2ca JG |
3032 | /* Remove trigger from channel_triggers_ht. */ |
3033 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
3034 | channel_triggers_ht_node) { | |
3035 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
3036 | ||
3037 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
3038 | &trigger_list->list, node) { | |
e8f7fa11 | 3039 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
3040 | continue; |
3041 | } | |
3042 | ||
3043 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
3044 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
3045 | /* A trigger can only appear once per channel */ |
3046 | break; | |
ab0ee2ca JG |
3047 | } |
3048 | } | |
3049 | ||
6487ad53 FD |
3050 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
3051 | teardown_tracer_notifier(state, trigger); | |
e7c93cf9 JR |
3052 | } |
3053 | ||
51367634 JR |
3054 | if (is_trigger_action_notify(trigger)) { |
3055 | /* | |
3056 | * Remove and release the client list from | |
3057 | * notification_trigger_clients_ht. | |
3058 | */ | |
3059 | client_list = get_client_list_from_condition(state, condition); | |
3060 | assert(client_list); | |
ed327204 | 3061 | |
091fa780 FD |
3062 | pthread_mutex_lock(&client_list->lock); |
3063 | cds_list_del(&trigger_ht_element->client_list_trigger_node); | |
3064 | pthread_mutex_unlock(&client_list->lock); | |
3065 | ||
51367634 JR |
3066 | /* Put new reference and the hashtable's reference. */ |
3067 | notification_client_list_put(client_list); | |
3068 | notification_client_list_put(client_list); | |
3069 | client_list = NULL; | |
3070 | } | |
ab0ee2ca | 3071 | |
2758e38b FD |
3072 | /* Remove trigger from triggers_ht. */ |
3073 | notif_thread_state_remove_trigger_ht_elem(state, trigger_ht_element); | |
ab0ee2ca | 3074 | |
7ca172c1 | 3075 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 3076 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 3077 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
3078 | end: |
3079 | rcu_read_unlock(); | |
3080 | if (_cmd_reply) { | |
3081 | *_cmd_reply = cmd_reply; | |
3082 | } | |
3083 | return 0; | |
3084 | } | |
3085 | ||
3086 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
3087 | int handle_notification_thread_command( | |
3088 | struct notification_thread_handle *handle, | |
3089 | struct notification_thread_state *state) | |
3090 | { | |
3091 | int ret; | |
3092 | uint64_t counter; | |
3093 | struct notification_thread_command *cmd; | |
3094 | ||
8abe313a | 3095 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 3096 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 3097 | sizeof(counter)); |
18aeca05 | 3098 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
3099 | goto error; |
3100 | } | |
3101 | ||
3102 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
3103 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
3104 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
3105 | cds_list_del(&cmd->cmd_list_node); |
3106 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
6900ae81 FD |
3107 | |
3108 | DBG("[notification-thread] Received `%s` command", | |
3109 | notification_command_type_str(cmd->type)); | |
ab0ee2ca JG |
3110 | switch (cmd->type) { |
3111 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
3112 | ret = handle_notification_thread_command_register_trigger(state, |
3113 | cmd->parameters.register_trigger.trigger, | |
0efb2ad7 | 3114 | cmd->parameters.register_trigger.is_trigger_anonymous, |
ab0ee2ca JG |
3115 | &cmd->reply_code); |
3116 | break; | |
3117 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 3118 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
3119 | state, |
3120 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
3121 | &cmd->reply_code); |
3122 | break; | |
3123 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 3124 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
3125 | state, |
3126 | cmd->parameters.add_channel.session.name, | |
3127 | cmd->parameters.add_channel.session.uid, | |
3128 | cmd->parameters.add_channel.session.gid, | |
3129 | cmd->parameters.add_channel.channel.name, | |
3130 | cmd->parameters.add_channel.channel.domain, | |
3131 | cmd->parameters.add_channel.channel.key, | |
3132 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
3133 | &cmd->reply_code); |
3134 | break; | |
3135 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
3136 | ret = handle_notification_thread_command_remove_channel( |
3137 | state, cmd->parameters.remove_channel.key, | |
3138 | cmd->parameters.remove_channel.domain, | |
3139 | &cmd->reply_code); | |
3140 | break; | |
0ca52944 | 3141 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 3142 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 3143 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 3144 | state, |
ed327204 JG |
3145 | cmd->type, |
3146 | cmd->parameters.session_rotation.session_name, | |
3147 | cmd->parameters.session_rotation.uid, | |
3148 | cmd->parameters.session_rotation.gid, | |
3149 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
3150 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
3151 | &cmd->reply_code); |
3152 | break; | |
d02d7404 JR |
3153 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
3154 | ret = handle_notification_thread_command_add_tracer_event_source( | |
3155 | state, | |
3156 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3157 | cmd->parameters.tracer_event_source.domain, | |
3158 | &cmd->reply_code); | |
3159 | break; | |
3160 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
3161 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
3162 | state, | |
3163 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3164 | &cmd->reply_code); | |
3165 | break; | |
fbc9f37d JR |
3166 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
3167 | { | |
3168 | struct lttng_triggers *triggers = NULL; | |
3169 | ||
3170 | ret = handle_notification_thread_command_list_triggers( | |
3171 | handle, | |
3172 | state, | |
3173 | cmd->parameters.list_triggers.uid, | |
3174 | &triggers, | |
3175 | &cmd->reply_code); | |
3176 | cmd->reply.list_triggers.triggers = triggers; | |
3177 | ret = 0; | |
3178 | break; | |
3179 | } | |
ab0ee2ca | 3180 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
3181 | cmd->reply_code = LTTNG_OK; |
3182 | ret = 1; | |
3183 | goto end; | |
8790759c FD |
3184 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
3185 | { | |
3186 | struct lttng_trigger *trigger = NULL; | |
3187 | ||
3188 | ret = handle_notification_thread_command_get_trigger(state, | |
3189 | cmd->parameters.get_trigger.trigger, &trigger, | |
3190 | &cmd->reply_code); | |
3191 | cmd->reply.get_trigger.trigger = trigger; | |
3192 | break; | |
3193 | } | |
f2b3ef9f JG |
3194 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
3195 | { | |
3196 | const enum client_transmission_status client_status = | |
3197 | cmd->parameters.client_communication_update | |
3198 | .status; | |
3199 | const notification_client_id client_id = | |
3200 | cmd->parameters.client_communication_update.id; | |
3201 | struct notification_client *client; | |
3202 | ||
3203 | rcu_read_lock(); | |
3204 | client = get_client_from_id(client_id, state); | |
3205 | ||
3206 | if (!client) { | |
3207 | /* | |
3208 | * Client error was probably already picked-up by the | |
3209 | * notification thread or it has disconnected | |
3210 | * gracefully while this command was queued. | |
3211 | */ | |
3212 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
3213 | client_id); | |
3214 | ret = 0; | |
3215 | } else { | |
f2b3ef9f JG |
3216 | ret = client_handle_transmission_status( |
3217 | client, client_status, state); | |
f2b3ef9f JG |
3218 | } |
3219 | rcu_read_unlock(); | |
3220 | break; | |
3221 | } | |
ab0ee2ca JG |
3222 | default: |
3223 | ERR("[notification-thread] Unknown internal command received"); | |
3224 | goto error_unlock; | |
3225 | } | |
3226 | ||
3227 | if (ret) { | |
3228 | goto error_unlock; | |
3229 | } | |
3230 | end: | |
0ab399e0 JG |
3231 | if (cmd->is_async) { |
3232 | free(cmd); | |
3233 | cmd = NULL; | |
3234 | } else { | |
3235 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3236 | } | |
ab0ee2ca JG |
3237 | return ret; |
3238 | error_unlock: | |
3239 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3240 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3241 | cmd->reply_code = LTTNG_ERR_FATAL; |
3242 | error: | |
3243 | /* Indicate a fatal error to the caller. */ | |
3244 | return -1; | |
3245 | } | |
3246 | ||
ab0ee2ca JG |
3247 | static |
3248 | int socket_set_non_blocking(int socket) | |
3249 | { | |
3250 | int ret, flags; | |
3251 | ||
3252 | /* Set the pipe as non-blocking. */ | |
3253 | ret = fcntl(socket, F_GETFL, 0); | |
3254 | if (ret == -1) { | |
3255 | PERROR("fcntl get socket flags"); | |
3256 | goto end; | |
3257 | } | |
3258 | flags = ret; | |
3259 | ||
3260 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3261 | if (ret == -1) { | |
3262 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3263 | goto end; | |
3264 | } | |
3265 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3266 | end: | |
3267 | return ret; | |
3268 | } | |
3269 | ||
3270 | static | |
14fa22f8 | 3271 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3272 | { |
3273 | int ret; | |
3274 | ||
882093ee JR |
3275 | |
3276 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3277 | |
3278 | client->communication.inbound.bytes_to_receive = | |
3279 | sizeof(struct lttng_notification_channel_message); | |
3280 | client->communication.inbound.msg_type = | |
3281 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3282 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3283 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3284 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3285 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3286 | client->communication.inbound.bytes_to_receive); |
882093ee | 3287 | |
14fa22f8 | 3288 | return ret; |
ab0ee2ca JG |
3289 | } |
3290 | ||
3291 | int handle_notification_thread_client_connect( | |
3292 | struct notification_thread_state *state) | |
3293 | { | |
3294 | int ret; | |
3295 | struct notification_client *client; | |
3296 | ||
3297 | DBG("[notification-thread] Handling new notification channel client connection"); | |
3298 | ||
3299 | client = zmalloc(sizeof(*client)); | |
3300 | if (!client) { | |
3301 | /* Fatal error. */ | |
3302 | ret = -1; | |
3303 | goto error; | |
3304 | } | |
6c24d3fd | 3305 | |
505b2d90 | 3306 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3307 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3308 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3309 | lttng_payload_init(&client->communication.inbound.payload); |
3310 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3311 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3312 | |
14fa22f8 JG |
3313 | ret = client_reset_inbound_state(client); |
3314 | if (ret) { | |
3315 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
e742b055 | 3316 | ret = 0; |
14fa22f8 JG |
3317 | goto error; |
3318 | } | |
ab0ee2ca JG |
3319 | |
3320 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3321 | if (ret < 0) { | |
3322 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
3323 | ret = 0; | |
3324 | goto error; | |
3325 | } | |
3326 | ||
3327 | client->socket = ret; | |
3328 | ||
3329 | ret = socket_set_non_blocking(client->socket); | |
3330 | if (ret) { | |
3331 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
3332 | goto error; | |
3333 | } | |
3334 | ||
3335 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3336 | if (ret < 0) { | |
3337 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
3338 | ret = 0; | |
3339 | goto error; | |
3340 | } | |
3341 | ||
3342 | ret = lttng_poll_add(&state->events, client->socket, | |
3343 | LPOLLIN | LPOLLERR | | |
3344 | LPOLLHUP | LPOLLRDHUP); | |
3345 | if (ret < 0) { | |
3346 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
3347 | ret = 0; | |
3348 | goto error; | |
3349 | } | |
3350 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
3351 | client->socket); | |
3352 | ||
ab0ee2ca JG |
3353 | rcu_read_lock(); |
3354 | cds_lfht_add(state->client_socket_ht, | |
3355 | hash_client_socket(client->socket), | |
3356 | &client->client_socket_ht_node); | |
ac1889bf JG |
3357 | cds_lfht_add(state->client_id_ht, |
3358 | hash_client_id(client->id), | |
3359 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3360 | rcu_read_unlock(); |
3361 | ||
3362 | return ret; | |
6c24d3fd | 3363 | |
ab0ee2ca JG |
3364 | error: |
3365 | notification_client_destroy(client, state); | |
3366 | return ret; | |
3367 | } | |
3368 | ||
6c24d3fd JG |
3369 | /* |
3370 | * RCU read-lock must be held by the caller. | |
3371 | * Client lock must _not_ be held by the caller. | |
3372 | */ | |
505b2d90 JG |
3373 | static |
3374 | int notification_thread_client_disconnect( | |
3375 | struct notification_client *client, | |
ab0ee2ca | 3376 | struct notification_thread_state *state) |
505b2d90 JG |
3377 | { |
3378 | int ret; | |
3379 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3380 | ||
3381 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 3382 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3383 | client->communication.active = false; |
6c24d3fd JG |
3384 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3385 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3386 | pthread_mutex_unlock(&client->lock); | |
3387 | ||
505b2d90 JG |
3388 | ret = lttng_poll_del(&state->events, client->socket); |
3389 | if (ret) { | |
3390 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
3391 | client->socket); | |
3392 | } | |
3393 | ||
505b2d90 JG |
3394 | /* Release all conditions to which the client was subscribed. */ |
3395 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3396 | &client->condition_list, node) { | |
3397 | (void) notification_thread_client_unsubscribe(client, | |
3398 | condition_list_element->condition, state, NULL); | |
3399 | } | |
3400 | ||
3401 | /* | |
3402 | * Client no longer accessible to other threads (through the | |
3403 | * client lists). | |
3404 | */ | |
3405 | notification_client_destroy(client, state); | |
3406 | return ret; | |
3407 | } | |
3408 | ||
3409 | int handle_notification_thread_client_disconnect( | |
3410 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3411 | { |
3412 | int ret = 0; | |
3413 | struct notification_client *client; | |
3414 | ||
3415 | rcu_read_lock(); | |
3416 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
3417 | client_socket); | |
3418 | client = get_client_from_socket(client_socket, state); | |
3419 | if (!client) { | |
3420 | /* Internal state corruption, fatal error. */ | |
3421 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
3422 | client_socket); | |
3423 | ret = -1; | |
3424 | goto end; | |
3425 | } | |
3426 | ||
505b2d90 | 3427 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3428 | end: |
3429 | rcu_read_unlock(); | |
3430 | return ret; | |
3431 | } | |
3432 | ||
3433 | int handle_notification_thread_client_disconnect_all( | |
3434 | struct notification_thread_state *state) | |
3435 | { | |
3436 | struct cds_lfht_iter iter; | |
3437 | struct notification_client *client; | |
3438 | bool error_encoutered = false; | |
3439 | ||
3440 | rcu_read_lock(); | |
3441 | DBG("[notification-thread] Closing all client connections"); | |
3442 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
505b2d90 | 3443 | client_socket_ht_node) { |
ab0ee2ca JG |
3444 | int ret; |
3445 | ||
505b2d90 JG |
3446 | ret = notification_thread_client_disconnect( |
3447 | client, state); | |
ab0ee2ca JG |
3448 | if (ret) { |
3449 | error_encoutered = true; | |
3450 | } | |
3451 | } | |
3452 | rcu_read_unlock(); | |
3453 | return error_encoutered ? 1 : 0; | |
3454 | } | |
3455 | ||
3456 | int handle_notification_thread_trigger_unregister_all( | |
3457 | struct notification_thread_state *state) | |
3458 | { | |
4149ace8 | 3459 | bool error_occurred = false; |
ab0ee2ca JG |
3460 | struct cds_lfht_iter iter; |
3461 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3462 | ||
763de384 | 3463 | rcu_read_lock(); |
ab0ee2ca JG |
3464 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3465 | node) { | |
3466 | int ret = handle_notification_thread_command_unregister_trigger( | |
3467 | state, trigger_ht_element->trigger, NULL); | |
3468 | if (ret) { | |
4149ace8 | 3469 | error_occurred = true; |
ab0ee2ca JG |
3470 | } |
3471 | } | |
763de384 | 3472 | rcu_read_unlock(); |
4149ace8 | 3473 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3474 | } |
3475 | ||
dd877ea6 JG |
3476 | static |
3477 | int client_handle_transmission_status( | |
3478 | struct notification_client *client, | |
3479 | enum client_transmission_status transmission_status, | |
3480 | struct notification_thread_state *state) | |
3481 | { | |
3482 | int ret = 0; | |
3483 | ||
3484 | switch (transmission_status) { | |
3485 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3486 | ret = lttng_poll_mod(&state->events, client->socket, | |
3487 | CLIENT_POLL_MASK_IN); | |
3488 | if (ret) { | |
3489 | goto end; | |
3490 | } | |
3491 | ||
dd877ea6 JG |
3492 | break; |
3493 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3494 | /* | |
3495 | * We want to be notified whenever there is buffer space | |
3496 | * available to send the rest of the payload. | |
3497 | */ | |
3498 | ret = lttng_poll_mod(&state->events, client->socket, | |
3499 | CLIENT_POLL_MASK_IN_OUT); | |
3500 | if (ret) { | |
3501 | goto end; | |
3502 | } | |
3503 | break; | |
3504 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3505 | ret = notification_thread_client_disconnect(client, state); | |
3506 | if (ret) { | |
3507 | goto end; | |
3508 | } | |
3509 | break; | |
3510 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3511 | ret = -1; | |
3512 | goto end; | |
3513 | default: | |
3514 | abort(); | |
3515 | } | |
3516 | end: | |
3517 | return ret; | |
3518 | } | |
3519 | ||
505b2d90 | 3520 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3521 | static |
dd877ea6 | 3522 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3523 | struct notification_client *client) |
ab0ee2ca JG |
3524 | { |
3525 | ssize_t ret; | |
3526 | size_t to_send_count; | |
dd877ea6 | 3527 | enum client_transmission_status status; |
882093ee JR |
3528 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3529 | &client->communication.outbound.payload, 0, -1); | |
3530 | const int fds_to_send_count = | |
3531 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3532 | |
505b2d90 JG |
3533 | ASSERT_LOCKED(client->lock); |
3534 | ||
f2b3ef9f JG |
3535 | if (!client->communication.active) { |
3536 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3537 | goto end; | |
3538 | } | |
3539 | ||
882093ee JR |
3540 | if (pv.buffer.size == 0) { |
3541 | /* | |
3542 | * If both data and fds are equal to zero, we are in an invalid | |
3543 | * state. | |
3544 | */ | |
3545 | assert(fds_to_send_count != 0); | |
3546 | goto send_fds; | |
3547 | } | |
3548 | ||
3549 | /* Send data. */ | |
3550 | to_send_count = pv.buffer.size; | |
ab0ee2ca JG |
3551 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", |
3552 | client->socket); | |
3553 | ||
3554 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3555 | pv.buffer.data, |
ab0ee2ca | 3556 | to_send_count); |
44c180ca | 3557 | if ((ret >= 0 && ret < to_send_count)) { |
ab0ee2ca JG |
3558 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", |
3559 | client->socket); | |
3560 | to_send_count -= max(ret, 0); | |
3561 | ||
6f110534 | 3562 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3563 | pv.buffer.data + |
3564 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3565 | to_send_count); |
3566 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3567 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3568 | to_send_count); |
3569 | if (ret) { | |
3570 | goto error; | |
3571 | } | |
6c24d3fd | 3572 | |
dd877ea6 | 3573 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3574 | goto end; |
ab0ee2ca | 3575 | } else if (ret < 0) { |
6c24d3fd | 3576 | /* Generic error, disable the client's communication. */ |
dd877ea6 | 3577 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3578 | client->socket); |
6c24d3fd | 3579 | client->communication.active = false; |
dd877ea6 | 3580 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3581 | goto end; |
ab0ee2ca | 3582 | } else { |
882093ee JR |
3583 | /* |
3584 | * No error and flushed the queue completely. | |
3585 | * | |
3586 | * The payload buffer size is used later to | |
3587 | * check if there is notifications queued. So albeit that the | |
3588 | * direct caller knows that the transmission is complete, we | |
3589 | * need to set the buffer size to zero. | |
3590 | */ | |
ab0ee2ca | 3591 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3592 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3593 | if (ret) { |
3594 | goto error; | |
3595 | } | |
882093ee | 3596 | } |
6c24d3fd | 3597 | |
882093ee JR |
3598 | send_fds: |
3599 | /* No fds to send, transmission is complete. */ | |
3600 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3601 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3602 | goto end; |
dd877ea6 | 3603 | } |
882093ee JR |
3604 | |
3605 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3606 | client->socket, &pv); | |
3607 | if (ret < 0) { | |
3608 | /* Generic error, disable the client's communication. */ | |
3609 | ERR("[notification-thread] Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", | |
3610 | client->socket); | |
3611 | client->communication.active = false; | |
3612 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3613 | goto end; | |
3614 | } else if (ret == 0) { | |
3615 | /* Nothing could be sent. */ | |
3616 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3617 | } else { | |
3618 | /* Fd passing is an all or nothing kind of thing. */ | |
3619 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3620 | /* | |
3621 | * The payload _fd_array count is used later to | |
3622 | * check if there is notifications queued. So although the | |
3623 | * direct caller knows that the transmission is complete, we | |
3624 | * need to clear the _fd_array for the queuing check. | |
3625 | */ | |
3626 | lttng_dynamic_pointer_array_clear( | |
3627 | &client->communication.outbound.payload | |
3628 | ._fd_handles); | |
3629 | } | |
3630 | ||
f2b3ef9f | 3631 | end: |
882093ee JR |
3632 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3633 | client->communication.outbound.queued_command_reply = false; | |
3634 | client->communication.outbound.dropped_notification = false; | |
3635 | lttng_payload_clear(&client->communication.outbound.payload); | |
3636 | } | |
3637 | ||
f2b3ef9f | 3638 | return status; |
ab0ee2ca | 3639 | error: |
f2b3ef9f | 3640 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3641 | } |
3642 | ||
882093ee JR |
3643 | static |
3644 | bool client_has_outbound_data_left( | |
3645 | const struct notification_client *client) | |
3646 | { | |
3647 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3648 | &client->communication.outbound.payload, 0, -1); | |
3649 | const bool has_data = pv.buffer.size != 0; | |
3650 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3651 | ||
3652 | return has_data || has_fds; | |
3653 | } | |
3654 | ||
6c24d3fd | 3655 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3656 | static |
3657 | int client_send_command_reply(struct notification_client *client, | |
3658 | struct notification_thread_state *state, | |
3659 | enum lttng_notification_channel_status status) | |
3660 | { | |
3661 | int ret; | |
3662 | struct lttng_notification_channel_command_reply reply = { | |
3663 | .status = (int8_t) status, | |
3664 | }; | |
3665 | struct lttng_notification_channel_message msg = { | |
3666 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3667 | .size = sizeof(reply), | |
3668 | }; | |
3669 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3670 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3671 | |
6c24d3fd JG |
3672 | memcpy(buffer, &msg, sizeof(msg)); |
3673 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
3674 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
505b2d90 | 3675 | |
6c24d3fd | 3676 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3677 | if (client->communication.outbound.queued_command_reply) { |
3678 | /* Protocol error. */ | |
6c24d3fd | 3679 | goto error_unlock; |
ab0ee2ca JG |
3680 | } |
3681 | ||
ab0ee2ca JG |
3682 | /* Enqueue buffer to outgoing queue and flush it. */ |
3683 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3684 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3685 | buffer, sizeof(buffer)); |
3686 | if (ret) { | |
6c24d3fd | 3687 | goto error_unlock; |
ab0ee2ca JG |
3688 | } |
3689 | ||
f2b3ef9f | 3690 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3691 | |
3692 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3693 | /* Queue could not be emptied. */ |
3694 | client->communication.outbound.queued_command_reply = true; | |
3695 | } | |
3696 | ||
3697 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3698 | ret = client_handle_transmission_status( |
3699 | client, transmission_status, state); | |
ab0ee2ca JG |
3700 | if (ret) { |
3701 | goto error; | |
3702 | } | |
3703 | ||
ab0ee2ca | 3704 | return 0; |
6c24d3fd JG |
3705 | error_unlock: |
3706 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3707 | error: |
3708 | return -1; | |
3709 | } | |
3710 | ||
505b2d90 JG |
3711 | static |
3712 | int client_handle_message_unknown(struct notification_client *client, | |
3713 | struct notification_thread_state *state) | |
3714 | { | |
3715 | int ret; | |
505b2d90 JG |
3716 | /* |
3717 | * Receiving message header. The function will be called again | |
3718 | * once the rest of the message as been received and can be | |
3719 | * interpreted. | |
3720 | */ | |
3721 | const struct lttng_notification_channel_message *msg; | |
3722 | ||
882093ee | 3723 | assert(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3724 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3725 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3726 | |
3727 | if (msg->size == 0 || | |
3728 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
3729 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
3730 | msg->size); | |
3731 | ret = -1; | |
3732 | goto end; | |
3733 | } | |
3734 | ||
3735 | switch (msg->type) { | |
3736 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3737 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3738 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3739 | break; | |
3740 | default: | |
3741 | ret = -1; | |
3742 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
3743 | goto end; | |
3744 | } | |
3745 | ||
3746 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3747 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3748 | client->communication.inbound.msg_type = |
3749 | (enum lttng_notification_channel_message_type) msg->type; | |
3750 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3751 | &client->communication.inbound.payload.buffer, msg->size); |
3752 | ||
3753 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3754 | msg = NULL; | |
505b2d90 | 3755 | end: |
505b2d90 JG |
3756 | return ret; |
3757 | } | |
3758 | ||
3759 | static | |
3760 | int client_handle_message_handshake(struct notification_client *client, | |
3761 | struct notification_thread_state *state) | |
3762 | { | |
3763 | int ret; | |
3764 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3765 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3766 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3767 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3768 | }; | |
3769 | const struct lttng_notification_channel_message msg_header = { | |
3770 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3771 | .size = sizeof(handshake_reply), | |
3772 | }; | |
3773 | enum lttng_notification_channel_status status = | |
3774 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3775 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3776 | |
3777 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3778 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3779 | sizeof(handshake_reply)); | |
3780 | ||
3781 | handshake_client = | |
3782 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3783 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3784 | .data; |
3785 | client->major = handshake_client->major; | |
3786 | client->minor = handshake_client->minor; | |
3787 | if (!client->communication.inbound.creds_received) { | |
3788 | ERR("[notification-thread] No credentials received from client"); | |
3789 | ret = -1; | |
3790 | goto end; | |
3791 | } | |
3792 | ||
3793 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3794 | &client->communication.inbound.creds); | |
3795 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3796 | &client->communication.inbound.creds); | |
3797 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
3798 | client->uid, client->gid, (int) client->major, | |
3799 | (int) client->minor); | |
3800 | ||
3801 | if (handshake_client->major != | |
3802 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3803 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3804 | } | |
3805 | ||
6c24d3fd JG |
3806 | pthread_mutex_lock(&client->lock); |
3807 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3808 | ret = lttng_dynamic_buffer_append( |
882093ee | 3809 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3810 | sizeof(send_buffer)); |
3811 | if (ret) { | |
3812 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
6c24d3fd | 3813 | goto end_unlock; |
505b2d90 JG |
3814 | } |
3815 | ||
3816 | client->validated = true; | |
3817 | client->communication.active = true; | |
6c24d3fd | 3818 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3819 | |
6c24d3fd JG |
3820 | /* Set reception state to receive the next message header. */ |
3821 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3822 | if (ret) { |
6c24d3fd | 3823 | ERR("[notification-thread] Failed to reset client communication's inbound state"); |
505b2d90 JG |
3824 | goto end; |
3825 | } | |
3826 | ||
6c24d3fd | 3827 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3828 | ret = client_send_command_reply(client, state, status); |
3829 | if (ret) { | |
3830 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3831 | goto end; | |
3832 | } | |
3833 | ||
6c24d3fd JG |
3834 | goto end; |
3835 | end_unlock: | |
505b2d90 | 3836 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3837 | end: |
505b2d90 JG |
3838 | return ret; |
3839 | } | |
3840 | ||
3841 | static | |
3842 | int client_handle_message_subscription( | |
3843 | struct notification_client *client, | |
3844 | enum lttng_notification_channel_message_type msg_type, | |
3845 | struct notification_thread_state *state) | |
3846 | { | |
3847 | int ret; | |
3848 | struct lttng_condition *condition; | |
3849 | enum lttng_notification_channel_status status = | |
3850 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3851 | struct lttng_payload_view condition_view = | |
882093ee JR |
3852 | lttng_payload_view_from_payload( |
3853 | &client->communication.inbound.payload, | |
505b2d90 JG |
3854 | 0, -1); |
3855 | size_t expected_condition_size; | |
3856 | ||
6c24d3fd JG |
3857 | /* |
3858 | * No need to lock client to sample the inbound state as the only | |
3859 | * other thread accessing clients (action executor) only uses the | |
3860 | * outbound state. | |
3861 | */ | |
882093ee | 3862 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3863 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3864 | if (ret != expected_condition_size) { | |
3865 | ERR("[notification-thread] Malformed condition received from client"); | |
3866 | goto end; | |
3867 | } | |
3868 | ||
5a6306f7 | 3869 | /* Ownership of condition is always transferred. */ |
505b2d90 JG |
3870 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { |
3871 | ret = notification_thread_client_subscribe( | |
3872 | client, condition, state, &status); | |
3873 | } else { | |
3874 | ret = notification_thread_client_unsubscribe( | |
3875 | client, condition, state, &status); | |
3876 | } | |
505b2d90 | 3877 | |
505b2d90 | 3878 | if (ret) { |
6c24d3fd | 3879 | goto end; |
505b2d90 JG |
3880 | } |
3881 | ||
3882 | /* Set reception state to receive the next message header. */ | |
3883 | ret = client_reset_inbound_state(client); | |
3884 | if (ret) { | |
3885 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
6c24d3fd JG |
3886 | goto end; |
3887 | } | |
3888 | ||
3889 | ret = client_send_command_reply(client, state, status); | |
3890 | if (ret) { | |
3891 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3892 | goto end; | |
505b2d90 JG |
3893 | } |
3894 | ||
505b2d90 JG |
3895 | end: |
3896 | return ret; | |
3897 | } | |
3898 | ||
ab0ee2ca JG |
3899 | static |
3900 | int client_dispatch_message(struct notification_client *client, | |
3901 | struct notification_thread_state *state) | |
3902 | { | |
3903 | int ret = 0; | |
3904 | ||
3905 | if (client->communication.inbound.msg_type != | |
3906 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3907 | client->communication.inbound.msg_type != | |
3908 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3909 | !client->validated) { | |
3910 | WARN("[notification-thread] client attempted a command before handshake"); | |
3911 | ret = -1; | |
3912 | goto end; | |
3913 | } | |
3914 | ||
3915 | switch (client->communication.inbound.msg_type) { | |
3916 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3917 | { | |
505b2d90 | 3918 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3919 | break; |
3920 | } | |
3921 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3922 | { | |
505b2d90 | 3923 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3924 | break; |
3925 | } | |
3926 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3927 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3928 | { | |
505b2d90 JG |
3929 | ret = client_handle_message_subscription(client, |
3930 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3931 | break; |
3932 | } | |
3933 | default: | |
3934 | abort(); | |
3935 | } | |
3936 | end: | |
3937 | return ret; | |
3938 | } | |
3939 | ||
3940 | /* Incoming data from client. */ | |
3941 | int handle_notification_thread_client_in( | |
3942 | struct notification_thread_state *state, int socket) | |
3943 | { | |
14fa22f8 | 3944 | int ret = 0; |
ab0ee2ca JG |
3945 | struct notification_client *client; |
3946 | ssize_t recv_ret; | |
3947 | size_t offset; | |
3948 | ||
98b5ff34 | 3949 | rcu_read_lock(); |
ab0ee2ca JG |
3950 | client = get_client_from_socket(socket, state); |
3951 | if (!client) { | |
3952 | /* Internal error, abort. */ | |
3953 | ret = -1; | |
3954 | goto end; | |
3955 | } | |
3956 | ||
982583bd JR |
3957 | if (client->communication.inbound.bytes_to_receive == 0 && |
3958 | client->communication.inbound.fds_to_receive != 0) { | |
3959 | /* Only FDs left to receive. */ | |
3960 | goto receive_fds; | |
3961 | } | |
3962 | ||
882093ee | 3963 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3964 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3965 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3966 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3967 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3968 | client->communication.inbound.bytes_to_receive, |
3969 | &client->communication.inbound.creds); | |
3970 | if (recv_ret > 0) { | |
01ea340e | 3971 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3972 | client->communication.inbound.creds_received = true; |
3973 | } | |
3974 | } else { | |
3975 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 3976 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3977 | client->communication.inbound.bytes_to_receive); |
3978 | } | |
505b2d90 JG |
3979 | if (recv_ret >= 0) { |
3980 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
3981 | } else { |
3982 | goto error_disconnect_client; | |
505b2d90 | 3983 | } |
6c24d3fd | 3984 | |
882093ee JR |
3985 | if (client->communication.inbound.bytes_to_receive != 0) { |
3986 | /* Message incomplete wait for more data. */ | |
3987 | ret = 0; | |
3988 | goto end; | |
ab0ee2ca JG |
3989 | } |
3990 | ||
982583bd | 3991 | receive_fds: |
882093ee JR |
3992 | assert(client->communication.inbound.bytes_to_receive == 0); |
3993 | ||
3994 | /* Receive fds. */ | |
3995 | if (client->communication.inbound.fds_to_receive != 0) { | |
3996 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
3997 | client->socket, | |
3998 | client->communication.inbound.fds_to_receive, | |
3999 | &client->communication.inbound.payload); | |
4000 | if (ret > 0) { | |
ab0ee2ca | 4001 | /* |
882093ee JR |
4002 | * Fds received. non blocking fds passing is all |
4003 | * or nothing. | |
ab0ee2ca | 4004 | */ |
882093ee JR |
4005 | ssize_t expected_size; |
4006 | ||
4007 | expected_size = sizeof(int) * | |
4008 | client->communication.inbound | |
4009 | .fds_to_receive; | |
4010 | assert(ret == expected_size); | |
4011 | client->communication.inbound.fds_to_receive = 0; | |
4012 | } else if (ret == 0) { | |
4013 | /* Received nothing. */ | |
4014 | ret = 0; | |
4015 | goto end; | |
4016 | } else { | |
ab0ee2ca JG |
4017 | goto error_disconnect_client; |
4018 | } | |
ab0ee2ca | 4019 | } |
882093ee JR |
4020 | |
4021 | /* At this point the message is complete.*/ | |
4022 | assert(client->communication.inbound.bytes_to_receive == 0 && | |
4023 | client->communication.inbound.fds_to_receive == 0); | |
4024 | ret = client_dispatch_message(client, state); | |
4025 | if (ret) { | |
4026 | /* | |
4027 | * Only returns an error if this client must be | |
4028 | * disconnected. | |
4029 | */ | |
4030 | goto error_disconnect_client; | |
4031 | } | |
4032 | ||
ab0ee2ca | 4033 | end: |
98b5ff34 | 4034 | rcu_read_unlock(); |
ab0ee2ca | 4035 | return ret; |
882093ee | 4036 | |
ab0ee2ca | 4037 | error_disconnect_client: |
505b2d90 | 4038 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 4039 | goto end; |
ab0ee2ca JG |
4040 | } |
4041 | ||
4042 | /* Client ready to receive outgoing data. */ | |
4043 | int handle_notification_thread_client_out( | |
4044 | struct notification_thread_state *state, int socket) | |
4045 | { | |
4046 | int ret; | |
4047 | struct notification_client *client; | |
f2b3ef9f | 4048 | enum client_transmission_status transmission_status; |
ab0ee2ca | 4049 | |
98b5ff34 | 4050 | rcu_read_lock(); |
ab0ee2ca JG |
4051 | client = get_client_from_socket(socket, state); |
4052 | if (!client) { | |
4053 | /* Internal error, abort. */ | |
4054 | ret = -1; | |
4055 | goto end; | |
4056 | } | |
4057 | ||
505b2d90 | 4058 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 4059 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
4060 | pthread_mutex_unlock(&client->lock); |
4061 | ||
f2b3ef9f JG |
4062 | ret = client_handle_transmission_status( |
4063 | client, transmission_status, state); | |
ab0ee2ca JG |
4064 | if (ret) { |
4065 | goto end; | |
4066 | } | |
4067 | end: | |
98b5ff34 | 4068 | rcu_read_unlock(); |
ab0ee2ca JG |
4069 | return ret; |
4070 | } | |
4071 | ||
4072 | static | |
e8360425 JD |
4073 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
4074 | const struct channel_state_sample *sample, | |
4075 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
4076 | { |
4077 | bool result = false; | |
4078 | uint64_t threshold; | |
4079 | enum lttng_condition_type condition_type; | |
e8360425 | 4080 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
4081 | condition, struct lttng_condition_buffer_usage, |
4082 | parent); | |
4083 | ||
ab0ee2ca JG |
4084 | if (use_condition->threshold_bytes.set) { |
4085 | threshold = use_condition->threshold_bytes.value; | |
4086 | } else { | |
4087 | /* | |
4088 | * Threshold was expressed as a ratio. | |
4089 | * | |
4090 | * TODO the threshold (in bytes) of conditions expressed | |
4091 | * as a ratio of total buffer size could be cached to | |
4092 | * forego this double-multiplication or it could be performed | |
4093 | * as fixed-point math. | |
4094 | * | |
d49487dc | 4095 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
4096 | * condition applies to multiple channels (i.e. don't assume |
4097 | * that all channels matching my_chann* have the same size...) | |
4098 | */ | |
4099 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
4100 | (double) buffer_capacity); | |
4101 | } | |
4102 | ||
4103 | condition_type = lttng_condition_get_type(condition); | |
4104 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
4105 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
4106 | threshold, sample->highest_usage); | |
4107 | ||
4108 | /* | |
4109 | * The low condition should only be triggered once _all_ of the | |
4110 | * streams in a channel have gone below the "low" threshold. | |
4111 | */ | |
4112 | if (sample->highest_usage <= threshold) { | |
4113 | result = true; | |
4114 | } | |
4115 | } else { | |
4116 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
4117 | threshold, sample->highest_usage); | |
4118 | ||
4119 | /* | |
4120 | * For high buffer usage scenarios, we want to trigger whenever | |
4121 | * _any_ of the streams has reached the "high" threshold. | |
4122 | */ | |
4123 | if (sample->highest_usage >= threshold) { | |
4124 | result = true; | |
4125 | } | |
4126 | } | |
e8360425 | 4127 | |
ab0ee2ca JG |
4128 | return result; |
4129 | } | |
4130 | ||
4131 | static | |
e8360425 JD |
4132 | bool evaluate_session_consumed_size_condition( |
4133 | const struct lttng_condition *condition, | |
4134 | uint64_t session_consumed_size) | |
4135 | { | |
4136 | uint64_t threshold; | |
4137 | const struct lttng_condition_session_consumed_size *size_condition = | |
4138 | container_of(condition, | |
4139 | struct lttng_condition_session_consumed_size, | |
4140 | parent); | |
4141 | ||
4142 | threshold = size_condition->consumed_threshold_bytes.value; | |
4143 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
4144 | threshold, session_consumed_size); | |
4145 | return session_consumed_size >= threshold; | |
4146 | } | |
4147 | ||
4148 | static | |
ed327204 | 4149 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 4150 | struct lttng_evaluation **evaluation, |
e8360425 JD |
4151 | const struct notification_thread_state *state, |
4152 | const struct channel_state_sample *previous_sample, | |
4153 | const struct channel_state_sample *latest_sample, | |
4154 | uint64_t previous_session_consumed_total, | |
4155 | uint64_t latest_session_consumed_total, | |
4156 | struct channel_info *channel_info) | |
ab0ee2ca JG |
4157 | { |
4158 | int ret = 0; | |
4159 | enum lttng_condition_type condition_type; | |
e8360425 JD |
4160 | const bool previous_sample_available = !!previous_sample; |
4161 | bool previous_sample_result = false; | |
ab0ee2ca JG |
4162 | bool latest_sample_result; |
4163 | ||
4164 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 4165 | |
e8360425 JD |
4166 | switch (condition_type) { |
4167 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4168 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
4169 | if (caa_likely(previous_sample_available)) { | |
4170 | previous_sample_result = | |
4171 | evaluate_buffer_usage_condition(condition, | |
4172 | previous_sample, channel_info->capacity); | |
4173 | } | |
4174 | latest_sample_result = evaluate_buffer_usage_condition( | |
4175 | condition, latest_sample, | |
4176 | channel_info->capacity); | |
4177 | break; | |
4178 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4179 | if (caa_likely(previous_sample_available)) { | |
4180 | previous_sample_result = | |
4181 | evaluate_session_consumed_size_condition( | |
4182 | condition, | |
4183 | previous_session_consumed_total); | |
4184 | } | |
4185 | latest_sample_result = | |
4186 | evaluate_session_consumed_size_condition( | |
4187 | condition, | |
4188 | latest_session_consumed_total); | |
4189 | break; | |
4190 | default: | |
4191 | /* Unknown condition type; internal error. */ | |
4192 | abort(); | |
4193 | } | |
ab0ee2ca JG |
4194 | |
4195 | if (!latest_sample_result || | |
4196 | (previous_sample_result == latest_sample_result)) { | |
4197 | /* | |
4198 | * Only trigger on a condition evaluation transition. | |
4199 | * | |
4200 | * NOTE: This edge-triggered logic may not be appropriate for | |
4201 | * future condition types. | |
4202 | */ | |
4203 | goto end; | |
4204 | } | |
4205 | ||
e8360425 JD |
4206 | if (!evaluation || !latest_sample_result) { |
4207 | goto end; | |
4208 | } | |
4209 | ||
4210 | switch (condition_type) { | |
4211 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4212 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
4213 | *evaluation = lttng_evaluation_buffer_usage_create( |
4214 | condition_type, | |
4215 | latest_sample->highest_usage, | |
e8360425 JD |
4216 | channel_info->capacity); |
4217 | break; | |
4218 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4219 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
4220 | latest_session_consumed_total); |
4221 | break; | |
4222 | default: | |
4223 | abort(); | |
4224 | } | |
4225 | ||
4226 | if (!*evaluation) { | |
4227 | ret = -1; | |
4228 | goto end; | |
ab0ee2ca JG |
4229 | } |
4230 | end: | |
4231 | return ret; | |
4232 | } | |
4233 | ||
4234 | static | |
f2b3ef9f | 4235 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4236 | { |
f2b3ef9f JG |
4237 | int ret = 0; |
4238 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 4239 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
4240 | }; |
4241 | ||
505b2d90 JG |
4242 | ASSERT_LOCKED(client->lock); |
4243 | ||
f2b3ef9f JG |
4244 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4245 | client->socket); | |
4246 | if (client->communication.outbound.dropped_notification) { | |
4247 | /* | |
4248 | * The client already has a "notification dropped" message | |
4249 | * in its outgoing queue. Nothing to do since all | |
4250 | * of those messages are coalesced. | |
4251 | */ | |
4252 | goto end; | |
4253 | } | |
4254 | ||
4255 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4256 | ret = lttng_dynamic_buffer_append( |
882093ee | 4257 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4258 | sizeof(msg)); |
f2b3ef9f JG |
4259 | if (ret) { |
4260 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4261 | client->socket); | |
4262 | } | |
4263 | end: | |
ab0ee2ca JG |
4264 | return ret; |
4265 | } | |
4266 | ||
f2b3ef9f JG |
4267 | static int client_handle_transmission_status_wrapper( |
4268 | struct notification_client *client, | |
4269 | enum client_transmission_status status, | |
4270 | void *user_data) | |
4271 | { | |
4272 | return client_handle_transmission_status(client, status, | |
4273 | (struct notification_thread_state *) user_data); | |
4274 | } | |
4275 | ||
4276 | static | |
4277 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4278 | const struct lttng_evaluation *evaluation, | |
4279 | struct notification_client_list* client_list, | |
4280 | struct notification_thread_state *state, | |
4281 | uid_t object_uid, gid_t object_gid) | |
4282 | { | |
ff588497 JR |
4283 | const struct lttng_credentials creds = { |
4284 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4285 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4286 | }; | |
4287 | ||
f2b3ef9f | 4288 | return notification_client_list_send_evaluation(client_list, |
52d55cf9 | 4289 | trigger, evaluation, |
ff588497 | 4290 | &creds, |
f2b3ef9f JG |
4291 | client_handle_transmission_status_wrapper, state); |
4292 | } | |
4293 | ||
f37d0f86 JG |
4294 | /* |
4295 | * Permission checks relative to notification channel clients are performed | |
4296 | * here. Notice how object, client, and trigger credentials are involved in | |
4297 | * this check. | |
4298 | * | |
4299 | * The `object` credentials are the credentials associated with the "subject" | |
4300 | * of a condition. For instance, a `rotation completed` condition applies | |
4301 | * to a session. When that condition is met, it will produce an evaluation | |
4302 | * against a session. Hence, in this case, the `object` credentials are the | |
4303 | * credentials of the "subject" session. | |
4304 | * | |
4305 | * The `trigger` credentials are the credentials of the user that registered the | |
4306 | * trigger. | |
4307 | * | |
4308 | * The `client` credentials are the credentials of the user that created a given | |
4309 | * notification channel. | |
4310 | * | |
4311 | * In terms of visibility, it is expected that non-privilieged users can only | |
4312 | * register triggers against "their" objects (their own sessions and | |
4313 | * applications they are allowed to interact with). They can then open a | |
4314 | * notification channel and subscribe to notifications associated with those | |
4315 | * triggers. | |
4316 | * | |
4317 | * As for privilieged users, they can register triggers against the objects of | |
4318 | * other users. They can then subscribe to the notifications associated to their | |
4319 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4320 | * triggers owned by other users; they must create their own triggers. | |
4321 | * | |
4322 | * This is more a concern of usability than security. It would be difficult for | |
4323 | * a root user reliably subscribe to a specific set of conditions without | |
4324 | * interference from external users (those could, for instance, unregister | |
4325 | * their triggers). | |
4326 | */ | |
f2b3ef9f JG |
4327 | LTTNG_HIDDEN |
4328 | int notification_client_list_send_evaluation( | |
4329 | struct notification_client_list *client_list, | |
52d55cf9 | 4330 | const struct lttng_trigger *trigger, |
9b63a4aa | 4331 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4332 | const struct lttng_credentials *source_object_creds, |
4333 | report_client_transmission_result_cb client_report, | |
4334 | void *user_data) | |
ab0ee2ca JG |
4335 | { |
4336 | int ret = 0; | |
c0a66c84 | 4337 | struct lttng_payload msg_payload; |
ab0ee2ca | 4338 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4339 | const struct lttng_notification notification = { |
52d55cf9 | 4340 | .trigger = (struct lttng_trigger *) trigger, |
9b63a4aa JG |
4341 | .evaluation = (struct lttng_evaluation *) evaluation, |
4342 | }; | |
3647288f JG |
4343 | struct lttng_notification_channel_message msg_header = { |
4344 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
4345 | }; | |
52d55cf9 JG |
4346 | const struct lttng_credentials *trigger_creds = |
4347 | lttng_trigger_get_credentials(trigger); | |
ab0ee2ca | 4348 | |
c0a66c84 | 4349 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4350 | |
c0a66c84 | 4351 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4352 | sizeof(msg_header)); |
ab0ee2ca JG |
4353 | if (ret) { |
4354 | goto end; | |
4355 | } | |
4356 | ||
c0a66c84 | 4357 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4358 | if (ret) { |
ab0ee2ca JG |
4359 | ERR("[notification-thread] Failed to serialize notification"); |
4360 | ret = -1; | |
4361 | goto end; | |
4362 | } | |
4363 | ||
3647288f | 4364 | /* Update payload size. */ |
505b2d90 JG |
4365 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4366 | ->size = (uint32_t)( | |
4367 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4368 | |
882093ee JR |
4369 | /* Update the payload number of fds. */ |
4370 | { | |
4371 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4372 | &msg_payload, 0, -1); | |
4373 | ||
4374 | ((struct lttng_notification_channel_message *) | |
4375 | msg_payload.buffer.data)->fds = (uint32_t) | |
4376 | lttng_payload_view_get_fd_handle_count(&pv); | |
4377 | } | |
4378 | ||
505b2d90 | 4379 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 4380 | cds_list_for_each_entry_safe(client_list_element, tmp, |
091fa780 | 4381 | &client_list->clients_list, node) { |
f2b3ef9f | 4382 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4383 | struct notification_client *client = |
4384 | client_list_element->client; | |
4385 | ||
505b2d90 JG |
4386 | ret = 0; |
4387 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4388 | if (!client->communication.active) { |
4389 | /* | |
4390 | * Skip inactive client (protocol error or | |
4391 | * disconnecting). | |
4392 | */ | |
4393 | DBG("Skipping client at it is marked as inactive"); | |
4394 | goto skip_client; | |
4395 | } | |
4396 | ||
f2b3ef9f | 4397 | if (source_object_creds) { |
ff588497 JR |
4398 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4399 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4400 | client->uid != 0) { |
4401 | /* | |
4402 | * Client is not allowed to monitor this | |
4403 | * object. | |
4404 | */ | |
4405 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
6c24d3fd | 4406 | goto skip_client; |
f2b3ef9f | 4407 | } |
90843f49 JR |
4408 | } |
4409 | ||
f712e5f6 | 4410 | if (client->uid != lttng_credentials_get_uid(trigger_creds)) { |
90843f49 | 4411 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4412 | goto skip_client; |
ab0ee2ca JG |
4413 | } |
4414 | ||
4415 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
c0a66c84 | 4416 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4417 | |
4418 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4419 | /* |
4420 | * Outgoing data is already buffered for this client; | |
4421 | * drop the notification and enqueue a "dropped | |
4422 | * notification" message if this is the first dropped | |
4423 | * notification since the socket spilled-over to the | |
4424 | * queue. | |
4425 | */ | |
f2b3ef9f JG |
4426 | ret = client_notification_overflow(client); |
4427 | if (ret) { | |
6c24d3fd JG |
4428 | /* Fatal error. */ |
4429 | goto skip_client; | |
ab0ee2ca | 4430 | } |
ab0ee2ca JG |
4431 | } |
4432 | ||
882093ee | 4433 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4434 | if (ret) { |
6c24d3fd JG |
4435 | /* Fatal error. */ |
4436 | goto skip_client; | |
ab0ee2ca JG |
4437 | } |
4438 | ||
f2b3ef9f | 4439 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4440 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4441 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4442 | if (ret) { |
6c24d3fd JG |
4443 | /* Fatal error. */ |
4444 | goto end_unlock_list; | |
505b2d90 | 4445 | } |
6c24d3fd JG |
4446 | |
4447 | continue; | |
4448 | ||
4449 | skip_client: | |
505b2d90 JG |
4450 | pthread_mutex_unlock(&client->lock); |
4451 | if (ret) { | |
6c24d3fd | 4452 | /* Fatal error. */ |
505b2d90 | 4453 | goto end_unlock_list; |
ab0ee2ca JG |
4454 | } |
4455 | } | |
4456 | ret = 0; | |
505b2d90 JG |
4457 | |
4458 | end_unlock_list: | |
4459 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4460 | end: |
c0a66c84 | 4461 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4462 | return ret; |
4463 | } | |
4464 | ||
8b524060 FD |
4465 | static |
4466 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4467 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4468 | { |
4469 | int ret; | |
b9a8d78f FD |
4470 | uint64_t token; |
4471 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4472 | char *capture_buffer = NULL; |
4473 | size_t capture_buffer_size; | |
94078603 JR |
4474 | void *reception_buffer; |
4475 | size_t reception_size; | |
4476 | ||
fc4b93fa | 4477 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
b8e2fb80 | 4478 | struct lttng_kernel_abi_event_notifier_notification kernel_notification; |
94078603 | 4479 | |
b9a8d78f | 4480 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4481 | switch(domain) { |
4482 | case LTTNG_DOMAIN_UST: | |
4483 | reception_buffer = (void *) &ust_notification; | |
4484 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4485 | break; |
4486 | case LTTNG_DOMAIN_KERNEL: | |
4487 | reception_buffer = (void *) &kernel_notification; | |
4488 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4489 | break; |
4490 | default: | |
4491 | abort(); | |
4492 | } | |
4493 | ||
4494 | /* | |
4495 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4496 | * ensuring that read/write of tracer notifications are atomic. | |
4497 | */ | |
4498 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4499 | reception_size); | |
4500 | if (ret != reception_size) { | |
4501 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4502 | notification_pipe_read_fd, reception_size, ret); | |
4503 | ret = -1; | |
4504 | goto end; | |
4505 | } | |
4506 | ||
4507 | switch(domain) { | |
4508 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4509 | token = ust_notification.token; |
82b3cbf4 | 4510 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4511 | break; |
4512 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4513 | token = kernel_notification.token; |
bbd6675c | 4514 | capture_buffer_size = kernel_notification.capture_buf_size; |
94078603 JR |
4515 | break; |
4516 | default: | |
4517 | abort(); | |
4518 | } | |
4519 | ||
82b3cbf4 JR |
4520 | if (capture_buffer_size == 0) { |
4521 | capture_buffer = NULL; | |
4522 | goto skip_capture; | |
4523 | } | |
4524 | ||
4525 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
4526 | ERR("[notification-thread] Event notifier has a capture payload size which exceeds the maximum allowed size: capture_payload_size = %zu bytes, max allowed size = %d bytes", | |
4527 | capture_buffer_size, MAX_CAPTURE_SIZE); | |
4528 | goto end; | |
4529 | } | |
4530 | ||
4531 | capture_buffer = zmalloc(capture_buffer_size); | |
4532 | if (!capture_buffer) { | |
4533 | ERR("[notification-thread] Failed to allocate capture buffer"); | |
4534 | goto end; | |
4535 | } | |
4536 | ||
4537 | /* Fetch additional payload (capture). */ | |
4538 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4539 | if (ret != capture_buffer_size) { | |
4540 | ERR("[notification-thread] Failed to read from event source pipe (fd = %i)", | |
4541 | notification_pipe_read_fd); | |
4542 | goto end; | |
4543 | } | |
4544 | ||
4545 | skip_capture: | |
4546 | notification = lttng_event_notifier_notification_create(token, domain, | |
4547 | capture_buffer, capture_buffer_size); | |
4548 | if (notification == NULL) { | |
4549 | goto end; | |
4550 | } | |
4551 | ||
4552 | /* | |
4553 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4554 | */ | |
4555 | capture_buffer = NULL; | |
4556 | ||
b9a8d78f | 4557 | end: |
82b3cbf4 | 4558 | free(capture_buffer); |
b9a8d78f FD |
4559 | return notification; |
4560 | } | |
4561 | ||
8b524060 FD |
4562 | static |
4563 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4564 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4565 | { |
b9a8d78f FD |
4566 | struct cds_lfht_node *node; |
4567 | struct cds_lfht_iter iter; | |
4568 | struct notification_trigger_tokens_ht_element *element; | |
4569 | struct lttng_evaluation *evaluation = NULL; | |
b9a8d78f FD |
4570 | enum action_executor_status executor_status; |
4571 | struct notification_client_list *client_list = NULL; | |
8b524060 | 4572 | int ret; |
7c920b63 | 4573 | unsigned int capture_count = 0; |
b9a8d78f | 4574 | |
94078603 JR |
4575 | /* Find triggers associated with this token. */ |
4576 | rcu_read_lock(); | |
4577 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4578 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4579 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4580 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4581 | if (caa_unlikely(!node)) { |
94078603 | 4582 | /* |
f1446131 JR |
4583 | * This is not an error, slow consumption of the tracer |
4584 | * notifications can lead to situations where a trigger is | |
4585 | * removed but we still get tracer notifications matching a | |
4586 | * trigger that no longer exists. | |
94078603 JR |
4587 | */ |
4588 | ret = 0; | |
4589 | goto end_unlock; | |
4590 | } | |
4591 | ||
4592 | element = caa_container_of(node, | |
4593 | struct notification_trigger_tokens_ht_element, | |
4594 | node); | |
4595 | ||
8dbb86b8 | 4596 | if (lttng_condition_event_rule_matches_get_capture_descriptor_count( |
7c920b63 PP |
4597 | lttng_trigger_get_const_condition(element->trigger), |
4598 | &capture_count) != LTTNG_CONDITION_STATUS_OK) { | |
4599 | ERR("Failed to get capture count"); | |
4600 | ret = -1; | |
4601 | goto end; | |
4602 | } | |
4603 | ||
4604 | if (!notification->capture_buffer && capture_count != 0) { | |
4605 | ERR("Expected capture but capture buffer is null"); | |
4606 | ret = -1; | |
4607 | goto end; | |
4608 | } | |
4609 | ||
8dbb86b8 | 4610 | evaluation = lttng_evaluation_event_rule_matches_create( |
7c920b63 PP |
4611 | container_of(lttng_trigger_get_const_condition( |
4612 | element->trigger), | |
8dbb86b8 | 4613 | struct lttng_condition_event_rule_matches, |
7c920b63 | 4614 | parent), |
7c920b63 PP |
4615 | notification->capture_buffer, |
4616 | notification->capture_buf_size, false); | |
4617 | ||
f1446131 | 4618 | if (evaluation == NULL) { |
b9a8d78f | 4619 | ERR("[notification-thread] Failed to create event rule hit evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4620 | ret = -1; |
4621 | goto end_unlock; | |
4622 | } | |
f1446131 JR |
4623 | client_list = get_client_list_from_condition(state, |
4624 | lttng_trigger_get_const_condition(element->trigger)); | |
72365501 | 4625 | executor_status = action_executor_enqueue_trigger(state->executor, |
f1446131 JR |
4626 | element->trigger, evaluation, NULL, client_list); |
4627 | switch (executor_status) { | |
4628 | case ACTION_EXECUTOR_STATUS_OK: | |
4629 | ret = 0; | |
4630 | break; | |
4631 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4632 | { | |
4633 | struct notification_client_list_element *client_list_element, | |
4634 | *tmp; | |
4635 | ||
4636 | /* | |
4637 | * Not a fatal error; this is expected and simply means the | |
4638 | * executor has too much work queued already. | |
4639 | */ | |
4640 | ret = 0; | |
4641 | ||
4642 | /* No clients subscribed to notifications for this trigger. */ | |
4643 | if (!client_list) { | |
4644 | break; | |
4645 | } | |
4646 | ||
4647 | /* Warn clients that a notification (or more) was dropped. */ | |
4648 | pthread_mutex_lock(&client_list->lock); | |
4649 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 4650 | &client_list->clients_list, node) { |
f1446131 JR |
4651 | enum client_transmission_status transmission_status; |
4652 | struct notification_client *client = | |
4653 | client_list_element->client; | |
4654 | ||
4655 | pthread_mutex_lock(&client->lock); | |
4656 | ret = client_notification_overflow(client); | |
4657 | if (ret) { | |
4658 | /* Fatal error. */ | |
4659 | goto next_client; | |
4660 | } | |
4661 | ||
4662 | transmission_status = | |
4663 | client_flush_outgoing_queue(client); | |
4664 | ret = client_handle_transmission_status( | |
4665 | client, transmission_status, state); | |
4666 | if (ret) { | |
4667 | /* Fatal error. */ | |
4668 | goto next_client; | |
4669 | } | |
4670 | next_client: | |
4671 | pthread_mutex_unlock(&client->lock); | |
4672 | if (ret) { | |
4673 | break; | |
4674 | } | |
4675 | } | |
4676 | ||
4677 | pthread_mutex_unlock(&client_list->lock); | |
4678 | break; | |
4679 | } | |
98dfca79 | 4680 | case ACTION_EXECUTOR_STATUS_INVALID: |
f1446131 JR |
4681 | case ACTION_EXECUTOR_STATUS_ERROR: |
4682 | /* Fatal error, shut down everything. */ | |
4683 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4684 | ret = -1; | |
4685 | goto end_unlock; | |
4686 | default: | |
4687 | /* Unhandled error. */ | |
4688 | abort(); | |
4689 | } | |
94078603 JR |
4690 | |
4691 | end_unlock: | |
f1446131 | 4692 | notification_client_list_put(client_list); |
94078603 | 4693 | rcu_read_unlock(); |
7c920b63 | 4694 | end: |
8b524060 FD |
4695 | return ret; |
4696 | } | |
4697 | ||
4698 | static | |
4699 | int handle_one_event_notifier_notification( | |
4700 | struct notification_thread_state *state, | |
4701 | int pipe, enum lttng_domain_type domain) | |
4702 | { | |
82b3cbf4 | 4703 | int ret = 0; |
8b524060 FD |
4704 | struct lttng_event_notifier_notification *notification = NULL; |
4705 | ||
4706 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4707 | if (notification == NULL) { | |
82b3cbf4 | 4708 | /* Reception failed, don't consider it fatal. */ |
8b524060 FD |
4709 | ERR("[notification-thread] Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
4710 | pipe, lttng_domain_type_str(domain)); | |
8b524060 FD |
4711 | goto end; |
4712 | } | |
4713 | ||
4714 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4715 | if (ret) { | |
4716 | ERR("[notification-thread] Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", | |
4717 | pipe, lttng_domain_type_str(domain)); | |
4718 | goto end; | |
4719 | } | |
4720 | ||
94078603 | 4721 | end: |
8b524060 | 4722 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4723 | return ret; |
4724 | } | |
4725 | ||
8b524060 FD |
4726 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4727 | int pipe, enum lttng_domain_type domain) | |
4728 | { | |
4729 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4730 | } | |
4731 | ||
ab0ee2ca JG |
4732 | int handle_notification_thread_channel_sample( |
4733 | struct notification_thread_state *state, int pipe, | |
4734 | enum lttng_domain_type domain) | |
4735 | { | |
4736 | int ret = 0; | |
4737 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4738 | struct channel_info *channel_info; |
4739 | struct cds_lfht_node *node; | |
4740 | struct cds_lfht_iter iter; | |
4741 | struct lttng_channel_trigger_list *trigger_list; | |
4742 | struct lttng_trigger_list_element *trigger_list_element; | |
4743 | bool previous_sample_available = false; | |
e8360425 JD |
4744 | struct channel_state_sample previous_sample, latest_sample; |
4745 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4746 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4747 | |
4748 | /* | |
4749 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4750 | * ensuring that read/write of sampling messages are atomic. | |
4751 | */ | |
7c2551ef | 4752 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
4753 | if (ret != sizeof(sample_msg)) { |
4754 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
4755 | pipe); | |
4756 | ret = -1; | |
4757 | goto end; | |
4758 | } | |
4759 | ||
4760 | ret = 0; | |
4761 | latest_sample.key.key = sample_msg.key; | |
4762 | latest_sample.key.domain = domain; | |
4763 | latest_sample.highest_usage = sample_msg.highest; | |
4764 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4765 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4766 | |
4767 | rcu_read_lock(); | |
4768 | ||
4769 | /* Retrieve the channel's informations */ | |
4770 | cds_lfht_lookup(state->channels_ht, | |
4771 | hash_channel_key(&latest_sample.key), | |
4772 | match_channel_info, | |
4773 | &latest_sample.key, | |
4774 | &iter); | |
4775 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4776 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4777 | /* |
4778 | * Not an error since the consumer can push a sample to the pipe | |
4779 | * and the rest of the session daemon could notify us of the | |
4780 | * channel's destruction before we get a chance to process that | |
4781 | * sample. | |
4782 | */ | |
4783 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
4784 | latest_sample.key.key, | |
526200e4 | 4785 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4786 | goto end_unlock; |
4787 | } | |
4788 | channel_info = caa_container_of(node, struct channel_info, | |
4789 | channels_ht_node); | |
e8360425 | 4790 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4791 | channel_info->name, |
ab0ee2ca | 4792 | latest_sample.key.key, |
8abe313a | 4793 | channel_info->session_info->name, |
ab0ee2ca | 4794 | latest_sample.highest_usage, |
e8360425 JD |
4795 | latest_sample.lowest_usage, |
4796 | latest_sample.channel_total_consumed); | |
4797 | ||
4798 | previous_session_consumed_total = | |
4799 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4800 | |
4801 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4802 | cds_lfht_lookup(state->channel_state_ht, | |
4803 | hash_channel_key(&latest_sample.key), | |
4804 | match_channel_state_sample, | |
4805 | &latest_sample.key, | |
4806 | &iter); | |
4807 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4808 | if (caa_likely(node)) { |
ab0ee2ca JG |
4809 | struct channel_state_sample *stored_sample; |
4810 | ||
4811 | /* Update the sample stored. */ | |
4812 | stored_sample = caa_container_of(node, | |
4813 | struct channel_state_sample, | |
4814 | channel_state_ht_node); | |
e8360425 | 4815 | |
ab0ee2ca JG |
4816 | memcpy(&previous_sample, stored_sample, |
4817 | sizeof(previous_sample)); | |
4818 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4819 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4820 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4821 | previous_sample_available = true; |
e8360425 JD |
4822 | |
4823 | latest_session_consumed_total = | |
4824 | previous_session_consumed_total + | |
4825 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4826 | } else { |
4827 | /* | |
4828 | * This is the channel's first sample, allocate space for and | |
4829 | * store the new sample. | |
4830 | */ | |
4831 | struct channel_state_sample *stored_sample; | |
4832 | ||
4833 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4834 | if (!stored_sample) { | |
4835 | ret = -1; | |
4836 | goto end_unlock; | |
4837 | } | |
4838 | ||
4839 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4840 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4841 | cds_lfht_add(state->channel_state_ht, | |
4842 | hash_channel_key(&stored_sample->key), | |
4843 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4844 | |
4845 | latest_session_consumed_total = | |
4846 | previous_session_consumed_total + | |
4847 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4848 | } |
4849 | ||
e8360425 JD |
4850 | channel_info->session_info->consumed_data_size = |
4851 | latest_session_consumed_total; | |
4852 | ||
ab0ee2ca JG |
4853 | /* Find triggers associated with this channel. */ |
4854 | cds_lfht_lookup(state->channel_triggers_ht, | |
4855 | hash_channel_key(&latest_sample.key), | |
4856 | match_channel_trigger_list, | |
4857 | &latest_sample.key, | |
4858 | &iter); | |
4859 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4860 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4861 | goto end_unlock; |
4862 | } | |
4863 | ||
f2b3ef9f | 4864 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4865 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4866 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4867 | }; |
4868 | ||
ab0ee2ca JG |
4869 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4870 | channel_triggers_ht_node); | |
4871 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4872 | node) { |
9b63a4aa | 4873 | const struct lttng_condition *condition; |
f2b3ef9f | 4874 | struct lttng_trigger *trigger; |
505b2d90 | 4875 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4876 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4877 | enum action_executor_status executor_status; |
ab0ee2ca | 4878 | |
505b2d90 | 4879 | ret = 0; |
ab0ee2ca | 4880 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4881 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 4882 | assert(condition); |
ab0ee2ca JG |
4883 | |
4884 | /* | |
4885 | * Check if any client is subscribed to the result of this | |
4886 | * evaluation. | |
4887 | */ | |
ed327204 | 4888 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4889 | |
ed327204 | 4890 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4891 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4892 | &latest_sample, |
4893 | previous_session_consumed_total, | |
4894 | latest_session_consumed_total, | |
4895 | channel_info); | |
4896 | if (caa_unlikely(ret)) { | |
505b2d90 | 4897 | goto put_list; |
ab0ee2ca JG |
4898 | } |
4899 | ||
e8360425 | 4900 | if (caa_likely(!evaluation)) { |
505b2d90 | 4901 | goto put_list; |
ab0ee2ca JG |
4902 | } |
4903 | ||
f2b3ef9f JG |
4904 | /* |
4905 | * Ownership of `evaluation` transferred to the action executor | |
4906 | * no matter the result. | |
4907 | */ | |
72365501 JR |
4908 | executor_status = action_executor_enqueue_trigger( |
4909 | state->executor, trigger, evaluation, | |
4910 | &channel_creds, client_list); | |
f2b3ef9f JG |
4911 | evaluation = NULL; |
4912 | switch (executor_status) { | |
4913 | case ACTION_EXECUTOR_STATUS_OK: | |
4914 | break; | |
4915 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4916 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4917 | /* | |
4918 | * TODO Add trigger identification (name/id) when | |
4919 | * it is added to the API. | |
4920 | */ | |
4921 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4922 | ret = -1; | |
4923 | goto put_list; | |
4924 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4925 | /* | |
4926 | * TODO Add trigger identification (name/id) when | |
4927 | * it is added to the API. | |
4928 | * | |
4929 | * Not a fatal error. | |
4930 | */ | |
4931 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4932 | ret = 0; | |
4933 | goto put_list; | |
4934 | default: | |
4935 | abort(); | |
4936 | } | |
4937 | ||
505b2d90 JG |
4938 | put_list: |
4939 | notification_client_list_put(client_list); | |
e0b5f87b | 4940 | if (caa_unlikely(ret)) { |
505b2d90 | 4941 | break; |
ab0ee2ca JG |
4942 | } |
4943 | } | |
4944 | end_unlock: | |
4945 | rcu_read_unlock(); | |
4946 | end: | |
4947 | return ret; | |
4948 | } |