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) { | |
f91c3842 | 533 | ERR("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. */ | |
f91c3842 | 873 | DBG("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 */ | |
f91c3842 | 902 | DBG("No channel sample associated with newly subscribed-to condition"); |
e4db5ace JR |
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) { |
f91c3842 | 912 | WARN("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) { | |
f91c3842 | 948 | ERR("Failed to retrieve session rotation condition's session name"); |
f82f93a1 JG |
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) { | |
f91c3842 | 979 | DBG("No known session matching name \"%s\"", |
f82f93a1 JG |
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. */ | |
f91c3842 | 1004 | ERR("Failed to create session rotation ongoing evaluation for session \"%s\"", |
f82f93a1 JG |
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: | |
f91c3842 | 1056 | DBG("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. */ | |
f91c3842 | 1070 | DBG("Newly subscribed-to condition evaluated to false, nothing to report to client"); |
e4db5ace JR |
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. */ | |
f91c3842 | 1087 | DBG("Newly subscribed-to condition evaluated to true, notifying client"); |
e4db5ace | 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 | 1166 | client, state)) { |
f91c3842 | 1167 | WARN("Evaluation of a condition on client subscription failed, aborting."); |
091fa780 FD |
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 | */ | |
f91c3842 | 1472 | DBG("No trigger list found for session \"%s\" as it is not yet known to the notification system", |
ed327204 JG |
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) { | |
f91c3842 | 1581 | ERR("Failed to retrieve session rotation condition's session name"); |
ea9a44f0 JG |
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 | ||
f91c3842 | 1636 | DBG("Found %i triggers that apply to newly created session", |
ea9a44f0 JG |
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) { | |
f91c3842 | 1662 | DBG("Found session info of session \"%s\" (uid = %i, gid = %i)", |
8abe313a JG |
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 | 1679 | if (!session) { |
f91c3842 | 1680 | ERR("Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", |
8abe313a | 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 | 1717 | |
f91c3842 | 1718 | DBG("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 | 1759 | |
f91c3842 | 1760 | DBG("Found %i triggers that apply to newly added channel", |
ab0ee2ca JG |
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 | ||
f91c3842 | 1820 | DBG("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) { | |
f91c3842 | 1836 | ERR("Channel being removed is unknown to the notification thread"); |
ab0ee2ca JG |
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) { | |
f91c3842 | 1924 | DBG("No triggers applying to session \"%s\" found", |
ed327204 JG |
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 | ||
f91c3842 | 2037 | DBG3("Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
2038 | tracer_event_source_fd, |
2039 | lttng_domain_type_str(domain_type)); | |
2040 | ||
2041 | /* Adding the read side pipe to the event poll. */ | |
55f2184b | 2042 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLPRI | LPOLLIN | LPOLLERR); |
d02d7404 | 2043 | if (ret < 0) { |
f91c3842 | 2044 | ERR("Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
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) { | |
f91c3842 | 2069 | ERR("Error creating lttng_poll_event"); |
8b524060 FD |
2070 | goto end; |
2071 | } | |
2072 | ||
2073 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2074 | if (ret < 0) { | |
f91c3842 | 2075 | ERR("Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", |
8b524060 FD |
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) { | |
f91c3842 | 2103 | ERR("Error consuming an event notifier notification from pipe: fd = %d", |
8b524060 FD |
2104 | pipe); |
2105 | } | |
2106 | } | |
2107 | end: | |
2108 | lttng_poll_clean(&events); | |
2109 | return ret; | |
2110 | } | |
2111 | ||
d02d7404 | 2112 | static |
163f4ee3 FD |
2113 | struct notification_event_tracer_event_source_element * |
2114 | find_tracer_event_source_element(struct notification_thread_state *state, | |
2115 | int tracer_event_source_fd) | |
d02d7404 | 2116 | { |
163f4ee3 | 2117 | struct notification_event_tracer_event_source_element *source_element; |
d02d7404 | 2118 | |
163f4ee3 | 2119 | cds_list_for_each_entry(source_element, |
d02d7404 | 2120 | &state->tracer_event_sources_list, node) { |
163f4ee3 FD |
2121 | if (source_element->fd == tracer_event_source_fd) { |
2122 | goto end; | |
d02d7404 | 2123 | } |
d02d7404 JR |
2124 | } |
2125 | ||
163f4ee3 FD |
2126 | source_element = NULL; |
2127 | end: | |
8ec89801 | 2128 | return source_element; |
163f4ee3 | 2129 | } |
d02d7404 | 2130 | |
163f4ee3 FD |
2131 | static |
2132 | int remove_tracer_event_source_from_pollset( | |
2133 | struct notification_thread_state *state, | |
2134 | struct notification_event_tracer_event_source_element *source_element) | |
2135 | { | |
2136 | int ret = 0; | |
2137 | ||
2138 | assert(source_element->is_fd_in_poll_set); | |
d02d7404 | 2139 | |
f91c3842 | 2140 | DBG3("Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
163f4ee3 | 2141 | source_element->fd, |
d02d7404 JR |
2142 | lttng_domain_type_str(source_element->domain)); |
2143 | ||
2144 | /* Removing the fd from the event poll set. */ | |
163f4ee3 | 2145 | ret = lttng_poll_del(&state->events, source_element->fd); |
d02d7404 | 2146 | if (ret < 0) { |
f91c3842 | 2147 | ERR("Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
163f4ee3 | 2148 | source_element->fd, |
d02d7404 | 2149 | lttng_domain_type_str(source_element->domain)); |
163f4ee3 | 2150 | ret = -1; |
d02d7404 JR |
2151 | goto end; |
2152 | } | |
2153 | ||
173900f6 JG |
2154 | source_element->is_fd_in_poll_set = false; |
2155 | ||
10c54deb FD |
2156 | /* |
2157 | * Force the notification thread to restart the poll() loop to ensure | |
2158 | * that any events from the removed fd are removed. | |
2159 | */ | |
2160 | state->restart_poll = true; | |
2161 | ||
163f4ee3 | 2162 | ret = drain_event_notifier_notification_pipe(state, source_element->fd, |
8b524060 FD |
2163 | source_element->domain); |
2164 | if (ret) { | |
f91c3842 | 2165 | ERR("Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", |
163f4ee3 | 2166 | source_element->fd, |
8b524060 | 2167 | lttng_domain_type_str(source_element->domain)); |
163f4ee3 | 2168 | ret = -1; |
8b524060 FD |
2169 | goto end; |
2170 | } | |
2171 | ||
d02d7404 | 2172 | end: |
d02d7404 JR |
2173 | return ret; |
2174 | } | |
2175 | ||
163f4ee3 | 2176 | int handle_notification_thread_tracer_event_source_died( |
d02d7404 JR |
2177 | struct notification_thread_state *state, |
2178 | int tracer_event_source_fd) | |
2179 | { | |
163f4ee3 FD |
2180 | int ret = 0; |
2181 | struct notification_event_tracer_event_source_element *source_element; | |
2182 | ||
2183 | source_element = find_tracer_event_source_element(state, | |
2184 | tracer_event_source_fd); | |
2185 | ||
2186 | assert(source_element); | |
2187 | ||
2188 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2189 | if (ret) { | |
2190 | ERR("Failed to remove dead tracer event source from poll set"); | |
2191 | } | |
d02d7404 | 2192 | |
163f4ee3 FD |
2193 | return ret; |
2194 | } | |
2195 | ||
2196 | static | |
2197 | int handle_notification_thread_command_remove_tracer_event_source( | |
2198 | struct notification_thread_state *state, | |
2199 | int tracer_event_source_fd, | |
2200 | enum lttng_error_code *_cmd_result) | |
2201 | { | |
2202 | int ret = 0; | |
2203 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2204 | struct notification_event_tracer_event_source_element *source_element = NULL; | |
2205 | ||
2206 | source_element = find_tracer_event_source_element(state, | |
2207 | tracer_event_source_fd); | |
2208 | ||
2209 | assert(source_element); | |
2210 | ||
2211 | /* Remove the tracer source from the list. */ | |
2212 | cds_list_del(&source_element->node); | |
2213 | ||
2214 | if (!source_element->is_fd_in_poll_set) { | |
2215 | /* Skip the poll set removal. */ | |
2216 | goto end; | |
2217 | } | |
2218 | ||
2219 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2220 | if (ret) { | |
2221 | ERR("Failed to remove tracer event source from poll set"); | |
2222 | cmd_result = LTTNG_ERR_FATAL; | |
2223 | } | |
2224 | ||
2225 | end: | |
2226 | free(source_element); | |
2227 | *_cmd_result = cmd_result; | |
d02d7404 JR |
2228 | return ret; |
2229 | } | |
2230 | ||
fbc9f37d JR |
2231 | static int handle_notification_thread_command_list_triggers( |
2232 | struct notification_thread_handle *handle, | |
2233 | struct notification_thread_state *state, | |
2234 | uid_t client_uid, | |
2235 | struct lttng_triggers **triggers, | |
2236 | enum lttng_error_code *_cmd_result) | |
2237 | { | |
2238 | int ret = 0; | |
2239 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2240 | struct cds_lfht_iter iter; | |
2241 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2242 | struct lttng_triggers *local_triggers = NULL; | |
2243 | const struct lttng_credentials *creds; | |
2244 | ||
2245 | rcu_read_lock(); | |
2246 | ||
2247 | local_triggers = lttng_triggers_create(); | |
2248 | if (!local_triggers) { | |
2249 | /* Not a fatal error. */ | |
2250 | cmd_result = LTTNG_ERR_NOMEM; | |
2251 | goto end; | |
2252 | } | |
2253 | ||
2254 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2255 | trigger_ht_element, node) { | |
2256 | /* | |
2257 | * Only return the triggers to which the client has access. | |
2258 | * The root user has visibility over all triggers. | |
2259 | */ | |
2260 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2261 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2262 | continue; | |
2263 | } | |
2264 | ||
2265 | ret = lttng_triggers_add(local_triggers, | |
2266 | trigger_ht_element->trigger); | |
2267 | if (ret < 0) { | |
2268 | /* Not a fatal error. */ | |
2269 | ret = 0; | |
2270 | cmd_result = LTTNG_ERR_NOMEM; | |
2271 | goto end; | |
2272 | } | |
2273 | } | |
2274 | ||
2275 | /* Transferring ownership to the caller. */ | |
2276 | *triggers = local_triggers; | |
2277 | local_triggers = NULL; | |
2278 | ||
2279 | end: | |
2280 | rcu_read_unlock(); | |
2281 | lttng_triggers_destroy(local_triggers); | |
2282 | *_cmd_result = cmd_result; | |
2283 | return ret; | |
2284 | } | |
2285 | ||
8790759c FD |
2286 | static inline void get_trigger_info_for_log(const struct lttng_trigger *trigger, |
2287 | const char **trigger_name, | |
2288 | uid_t *trigger_owner_uid) | |
2289 | { | |
2290 | enum lttng_trigger_status trigger_status; | |
2291 | ||
2292 | trigger_status = lttng_trigger_get_name(trigger, trigger_name); | |
2293 | switch (trigger_status) { | |
2294 | case LTTNG_TRIGGER_STATUS_OK: | |
2295 | break; | |
2296 | case LTTNG_TRIGGER_STATUS_UNSET: | |
0efb2ad7 | 2297 | *trigger_name = "(anonymous)"; |
8790759c FD |
2298 | break; |
2299 | default: | |
2300 | abort(); | |
2301 | } | |
2302 | ||
2303 | trigger_status = lttng_trigger_get_owner_uid(trigger, | |
2304 | trigger_owner_uid); | |
2305 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
2306 | } | |
2307 | ||
2308 | static int handle_notification_thread_command_get_trigger( | |
2309 | struct notification_thread_state *state, | |
2310 | const struct lttng_trigger *trigger, | |
2311 | struct lttng_trigger **registered_trigger, | |
2312 | enum lttng_error_code *_cmd_result) | |
2313 | { | |
2314 | int ret = -1; | |
2315 | struct cds_lfht_iter iter; | |
2316 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2317 | enum lttng_error_code cmd_result = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2318 | const char *trigger_name; | |
2319 | uid_t trigger_owner_uid; | |
2320 | ||
2321 | rcu_read_lock(); | |
2322 | ||
2323 | cds_lfht_for_each_entry( | |
2324 | state->triggers_ht, &iter, trigger_ht_element, node) { | |
2325 | if (lttng_trigger_is_equal( | |
2326 | trigger, trigger_ht_element->trigger)) { | |
2327 | /* Take one reference on the return trigger. */ | |
2328 | *registered_trigger = trigger_ht_element->trigger; | |
2329 | lttng_trigger_get(*registered_trigger); | |
2330 | ret = 0; | |
2331 | cmd_result = LTTNG_OK; | |
2332 | goto end; | |
2333 | } | |
2334 | } | |
2335 | ||
2336 | /* Not a fatal error if the trigger is not found. */ | |
2337 | get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid); | |
87661585 | 2338 | DBG("Failed to retrieve registered version of trigger: trigger name = '%s', trigger owner uid = %d", |
8790759c FD |
2339 | trigger_name, (int) trigger_owner_uid); |
2340 | ||
2341 | ret = 0; | |
2342 | ||
2343 | end: | |
2344 | rcu_read_unlock(); | |
2345 | *_cmd_result = cmd_result; | |
2346 | return ret; | |
2347 | } | |
2348 | ||
1da26331 | 2349 | static |
959e3c66 | 2350 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2351 | { |
959e3c66 | 2352 | bool is_supported; |
1da26331 JG |
2353 | |
2354 | switch (lttng_condition_get_type(condition)) { | |
2355 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2356 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2357 | { | |
959e3c66 | 2358 | int ret; |
1da26331 JG |
2359 | enum lttng_domain_type domain; |
2360 | ||
2361 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2362 | &domain); | |
959e3c66 | 2363 | assert(ret == 0); |
1da26331 JG |
2364 | |
2365 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2366 | is_supported = true; |
1da26331 JG |
2367 | goto end; |
2368 | } | |
2369 | ||
2370 | /* | |
2371 | * Older kernel tracers don't expose the API to monitor their | |
2372 | * buffers. Therefore, we reject triggers that require that | |
2373 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2374 | * |
2375 | * Assume unsupported on error. | |
1da26331 | 2376 | */ |
959e3c66 JR |
2377 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2378 | break; | |
2379 | } | |
8dbb86b8 | 2380 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 JR |
2381 | { |
2382 | const struct lttng_event_rule *event_rule; | |
2383 | enum lttng_domain_type domain; | |
2384 | const enum lttng_condition_status status = | |
8dbb86b8 | 2385 | lttng_condition_event_rule_matches_get_rule( |
959e3c66 JR |
2386 | condition, &event_rule); |
2387 | ||
2388 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
2389 | ||
2390 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2391 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2392 | is_supported = true; | |
2393 | goto end; | |
2394 | } | |
2395 | ||
2396 | /* | |
2397 | * Older kernel tracers can't emit notification. Therefore, we | |
2398 | * reject triggers that require that mechanism to be available | |
2399 | * to be evaluated. | |
2400 | * | |
2401 | * Assume unsupported on error. | |
2402 | */ | |
2403 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2404 | break; |
2405 | } | |
2406 | default: | |
959e3c66 | 2407 | is_supported = true; |
1da26331 JG |
2408 | } |
2409 | end: | |
959e3c66 | 2410 | return is_supported; |
1da26331 JG |
2411 | } |
2412 | ||
51eab943 JG |
2413 | /* Must be called with RCU read lock held. */ |
2414 | static | |
f2b3ef9f | 2415 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2416 | struct notification_thread_state *state) |
2417 | { | |
2418 | int ret = 0; | |
51eab943 JG |
2419 | const struct lttng_condition *condition; |
2420 | const char *session_name; | |
2421 | struct lttng_session_trigger_list *trigger_list; | |
2422 | ||
2423 | condition = lttng_trigger_get_const_condition(trigger); | |
2424 | switch (lttng_condition_get_type(condition)) { | |
2425 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2426 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2427 | { | |
2428 | enum lttng_condition_status status; | |
2429 | ||
2430 | status = lttng_condition_session_rotation_get_session_name( | |
2431 | condition, &session_name); | |
2432 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
f91c3842 | 2433 | ERR("Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); |
51eab943 JG |
2434 | ret = -1; |
2435 | goto end; | |
2436 | } | |
2437 | break; | |
2438 | } | |
2439 | default: | |
2440 | ret = -1; | |
2441 | goto end; | |
2442 | } | |
2443 | ||
ed327204 JG |
2444 | trigger_list = get_session_trigger_list(state, session_name); |
2445 | if (!trigger_list) { | |
f91c3842 | 2446 | DBG("Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
51eab943 JG |
2447 | session_name); |
2448 | goto end; | |
51eab943 | 2449 | |
ed327204 | 2450 | } |
51eab943 | 2451 | |
f91c3842 | 2452 | DBG("Newly registered trigger bound to session \"%s\"", |
51eab943 JG |
2453 | session_name); |
2454 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2455 | end: | |
2456 | return ret; | |
2457 | } | |
2458 | ||
2459 | /* Must be called with RCU read lock held. */ | |
2460 | static | |
f2b3ef9f | 2461 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2462 | struct notification_thread_state *state) |
2463 | { | |
2464 | int ret = 0; | |
2465 | struct cds_lfht_node *node; | |
2466 | struct cds_lfht_iter iter; | |
2467 | struct channel_info *channel; | |
2468 | ||
2469 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2470 | channels_ht_node) { | |
2471 | struct lttng_trigger_list_element *trigger_list_element; | |
2472 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2473 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2474 | |
2475 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2476 | continue; | |
2477 | } | |
2478 | ||
2479 | cds_lfht_lookup(state->channel_triggers_ht, | |
2480 | hash_channel_key(&channel->key), | |
2481 | match_channel_trigger_list, | |
2482 | &channel->key, | |
a5d64ae7 MD |
2483 | &lookup_iter); |
2484 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2485 | assert(node); |
2486 | trigger_list = caa_container_of(node, | |
2487 | struct lttng_channel_trigger_list, | |
2488 | channel_triggers_ht_node); | |
2489 | ||
2490 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2491 | if (!trigger_list_element) { | |
2492 | ret = -1; | |
2493 | goto end; | |
2494 | } | |
2495 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2496 | trigger_list_element->trigger = trigger; | |
2497 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
f91c3842 | 2498 | DBG("Newly registered trigger bound to channel \"%s\"", |
51eab943 JG |
2499 | channel->name); |
2500 | } | |
2501 | end: | |
2502 | return ret; | |
2503 | } | |
2504 | ||
f2b3ef9f JG |
2505 | static |
2506 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2507 | { | |
2508 | bool is_notify = false; | |
2509 | unsigned int i, count; | |
2510 | enum lttng_action_status action_status; | |
2511 | const struct lttng_action *action = | |
2512 | lttng_trigger_get_const_action(trigger); | |
2513 | enum lttng_action_type action_type; | |
2514 | ||
2515 | assert(action); | |
17182cfd | 2516 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2517 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2518 | is_notify = true; | |
2519 | goto end; | |
7c2fae7c | 2520 | } else if (action_type != LTTNG_ACTION_TYPE_LIST) { |
f2b3ef9f JG |
2521 | goto end; |
2522 | } | |
2523 | ||
702f26c8 | 2524 | action_status = lttng_action_list_get_count(action, &count); |
f2b3ef9f JG |
2525 | assert(action_status == LTTNG_ACTION_STATUS_OK); |
2526 | ||
2527 | for (i = 0; i < count; i++) { | |
2528 | const struct lttng_action *inner_action = | |
702f26c8 | 2529 | lttng_action_list_get_at_index( |
f2b3ef9f JG |
2530 | action, i); |
2531 | ||
17182cfd | 2532 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2533 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2534 | is_notify = true; | |
2535 | goto end; | |
2536 | } | |
2537 | } | |
2538 | ||
2539 | end: | |
2540 | return is_notify; | |
2541 | } | |
2542 | ||
242388e4 JR |
2543 | static bool trigger_name_taken(struct notification_thread_state *state, |
2544 | const struct lttng_trigger *trigger) | |
2545 | { | |
2546 | struct cds_lfht_iter iter; | |
2547 | ||
2548 | /* | |
2549 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2550 | * The match is done against the trigger name and uid. | |
2551 | */ | |
2552 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2553 | hash_trigger_by_name_uid(trigger), | |
2554 | match_trigger_by_name_uid, | |
2555 | trigger, | |
2556 | &iter); | |
2557 | return !!cds_lfht_iter_get_node(&iter); | |
2558 | } | |
2559 | ||
2560 | static | |
2561 | enum lttng_error_code generate_trigger_name( | |
2562 | struct notification_thread_state *state, | |
2563 | struct lttng_trigger *trigger, const char **name) | |
2564 | { | |
2565 | enum lttng_error_code ret_code = LTTNG_OK; | |
2566 | bool taken = false; | |
2567 | enum lttng_trigger_status status; | |
2568 | ||
2569 | do { | |
2570 | const int ret = lttng_trigger_generate_name(trigger, | |
2571 | state->trigger_id.name_offset++); | |
2572 | if (ret) { | |
2573 | /* The only reason this can fail right now. */ | |
2574 | ret_code = LTTNG_ERR_NOMEM; | |
2575 | break; | |
2576 | } | |
2577 | ||
2578 | status = lttng_trigger_get_name(trigger, name); | |
2579 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
2580 | ||
2581 | taken = trigger_name_taken(state, trigger); | |
2582 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2583 | ||
2584 | return ret_code; | |
2585 | } | |
2586 | ||
2758e38b FD |
2587 | static inline |
2588 | void notif_thread_state_remove_trigger_ht_elem( | |
2589 | struct notification_thread_state *state, | |
2590 | struct lttng_trigger_ht_element *trigger_ht_element) | |
2591 | { | |
2592 | assert(state); | |
2593 | assert(trigger_ht_element); | |
2594 | ||
2595 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2596 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); | |
2597 | } | |
2598 | ||
6487ad53 FD |
2599 | static |
2600 | enum lttng_error_code setup_tracer_notifier( | |
2601 | struct notification_thread_state *state, | |
2602 | struct lttng_trigger *trigger) | |
2603 | { | |
2604 | enum lttng_error_code ret; | |
2605 | enum event_notifier_error_accounting_status error_accounting_status; | |
2606 | struct cds_lfht_node *node; | |
2607 | uint64_t error_counter_index = 0; | |
2608 | struct lttng_condition *condition = lttng_trigger_get_condition(trigger); | |
2609 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; | |
2610 | ||
2611 | trigger_tokens_ht_element = zmalloc(sizeof(*trigger_tokens_ht_element)); | |
2612 | if (!trigger_tokens_ht_element) { | |
2613 | ret = LTTNG_ERR_NOMEM; | |
2614 | goto end; | |
2615 | } | |
2616 | ||
2617 | /* Add trigger token to the trigger_tokens_ht. */ | |
2618 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2619 | trigger_tokens_ht_element->token = LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2620 | trigger_tokens_ht_element->trigger = trigger; | |
2621 | ||
2622 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2623 | hash_key_u64(&trigger_tokens_ht_element->token, lttng_ht_seed), | |
2624 | match_trigger_token, | |
2625 | &trigger_tokens_ht_element->token, | |
2626 | &trigger_tokens_ht_element->node); | |
2627 | if (node != &trigger_tokens_ht_element->node) { | |
2628 | ret = LTTNG_ERR_TRIGGER_EXISTS; | |
2629 | goto error_free_ht_element; | |
2630 | } | |
2631 | ||
2632 | error_accounting_status = event_notifier_error_accounting_register_event_notifier( | |
2633 | trigger, &error_counter_index); | |
2634 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2635 | if (error_accounting_status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE) { | |
7c2fae7c | 2636 | DBG("Trigger list error accounting counter full."); |
6487ad53 FD |
2637 | ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING_FULL; |
2638 | } else { | |
2639 | ERR("Error registering trigger for error accounting"); | |
2640 | ret = LTTNG_ERR_EVENT_NOTIFIER_REGISTRATION; | |
2641 | } | |
2642 | ||
2643 | goto error_remove_ht_element; | |
2644 | } | |
2645 | ||
8dbb86b8 | 2646 | lttng_condition_event_rule_matches_set_error_counter_index( |
6487ad53 FD |
2647 | condition, error_counter_index); |
2648 | ||
2649 | ret = LTTNG_OK; | |
2650 | goto end; | |
2651 | ||
2652 | error_remove_ht_element: | |
2653 | cds_lfht_del(state->trigger_tokens_ht, &trigger_tokens_ht_element->node); | |
2654 | error_free_ht_element: | |
2655 | free(trigger_tokens_ht_element); | |
2656 | end: | |
2657 | return ret; | |
2658 | } | |
2659 | ||
ab0ee2ca | 2660 | /* |
f2b3ef9f | 2661 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2662 | * |
1da26331 | 2663 | * The effects of this are benign since: |
ab0ee2ca | 2664 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2665 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2666 | * - The notifications will not be sent since the client's credentials |
2667 | * are checked against the channel at that moment. | |
1da26331 JG |
2668 | * |
2669 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2670 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2671 | * |
2672 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2673 | * error code. | |
ab0ee2ca JG |
2674 | */ |
2675 | static | |
2676 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2677 | struct notification_thread_state *state, |
2678 | struct lttng_trigger *trigger, | |
0efb2ad7 | 2679 | bool is_trigger_anonymous, |
8abe313a | 2680 | enum lttng_error_code *cmd_result) |
ab0ee2ca JG |
2681 | { |
2682 | int ret = 0; | |
2683 | struct lttng_condition *condition; | |
ab0ee2ca JG |
2684 | struct notification_client_list *client_list = NULL; |
2685 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
ab0ee2ca | 2686 | struct cds_lfht_node *node; |
242388e4 | 2687 | const char* trigger_name; |
ab0ee2ca | 2688 | bool free_trigger = true; |
f2b3ef9f JG |
2689 | struct lttng_evaluation *evaluation = NULL; |
2690 | struct lttng_credentials object_creds; | |
ff588497 JR |
2691 | uid_t object_uid; |
2692 | gid_t object_gid; | |
f2b3ef9f | 2693 | enum action_executor_status executor_status; |
e6887944 JR |
2694 | const uint64_t trigger_tracer_token = |
2695 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2696 | |
2697 | rcu_read_lock(); | |
2698 | ||
e6887944 JR |
2699 | /* Set the trigger's tracer token. */ |
2700 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2701 | ||
0efb2ad7 JG |
2702 | if (!is_trigger_anonymous) { |
2703 | if (lttng_trigger_get_name(trigger, &trigger_name) == | |
2704 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2705 | const enum lttng_error_code ret_code = | |
2706 | generate_trigger_name(state, trigger, | |
2707 | &trigger_name); | |
242388e4 | 2708 | |
0efb2ad7 JG |
2709 | if (ret_code != LTTNG_OK) { |
2710 | /* Fatal error. */ | |
2711 | ret = -1; | |
2712 | *cmd_result = ret_code; | |
2713 | goto error; | |
2714 | } | |
2715 | } else if (trigger_name_taken(state, trigger)) { | |
2716 | /* Not a fatal error. */ | |
2717 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2718 | ret = 0; | |
242388e4 JR |
2719 | goto error; |
2720 | } | |
0efb2ad7 JG |
2721 | } else { |
2722 | trigger_name = "(anonymous)"; | |
242388e4 JR |
2723 | } |
2724 | ||
ab0ee2ca | 2725 | condition = lttng_trigger_get_condition(trigger); |
1da26331 JG |
2726 | assert(condition); |
2727 | ||
959e3c66 JR |
2728 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2729 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2730 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2731 | goto error; | |
1da26331 JG |
2732 | } |
2733 | ||
ab0ee2ca JG |
2734 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2735 | if (!trigger_ht_element) { | |
2736 | ret = -1; | |
2737 | goto error; | |
2738 | } | |
2739 | ||
2740 | /* Add trigger to the trigger_ht. */ | |
2741 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2742 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2743 | trigger_ht_element->trigger = trigger; |
2744 | ||
2745 | node = cds_lfht_add_unique(state->triggers_ht, | |
2746 | lttng_condition_hash(condition), | |
242388e4 JR |
2747 | match_trigger, |
2748 | trigger, | |
ab0ee2ca JG |
2749 | &trigger_ht_element->node); |
2750 | if (node != &trigger_ht_element->node) { | |
2751 | /* Not a fatal error, simply report it to the client. */ | |
2752 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2753 | goto error_free_ht_element; | |
2754 | } | |
2755 | ||
242388e4 JR |
2756 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2757 | hash_trigger_by_name_uid(trigger), | |
2758 | match_trigger_by_name_uid, | |
2759 | trigger, | |
2760 | &trigger_ht_element->node_by_name_uid); | |
2761 | if (node != &trigger_ht_element->node_by_name_uid) { | |
75e540c6 JG |
2762 | /* Internal error: add to triggers_ht should have failed. */ |
2763 | ret = -1; | |
242388e4 JR |
2764 | goto error_free_ht_element; |
2765 | } | |
2766 | ||
9c374932 JR |
2767 | /* From this point consider the trigger registered. */ |
2768 | lttng_trigger_set_as_registered(trigger); | |
2769 | ||
6487ad53 FD |
2770 | /* |
2771 | * Some triggers might need a tracer notifier depending on its | |
2772 | * condition and actions. | |
2773 | */ | |
2774 | if (lttng_trigger_needs_tracer_notifier(trigger)) { | |
2775 | enum lttng_error_code error_code; | |
e7c93cf9 | 2776 | |
6487ad53 FD |
2777 | error_code = setup_tracer_notifier(state, trigger); |
2778 | if (error_code != LTTNG_OK) { | |
2758e38b FD |
2779 | notif_thread_state_remove_trigger_ht_elem(state, |
2780 | trigger_ht_element); | |
6487ad53 FD |
2781 | if (error_code == LTTNG_ERR_NOMEM) { |
2782 | ret = -1; | |
2783 | } else { | |
2784 | *cmd_result = error_code; | |
2785 | ret = 0; | |
90aa04a1 FD |
2786 | } |
2787 | ||
6487ad53 | 2788 | goto error_free_ht_element; |
90aa04a1 | 2789 | } |
e7c93cf9 JR |
2790 | } |
2791 | ||
ab0ee2ca JG |
2792 | /* |
2793 | * The rest only applies to triggers that have a "notify" action. | |
2794 | * It is not skipped as this is the only action type currently | |
2795 | * supported. | |
2796 | */ | |
f2b3ef9f | 2797 | if (is_trigger_action_notify(trigger)) { |
091fa780 FD |
2798 | /* |
2799 | * Find or create the client list of this condition. It may | |
2800 | * already be present if another trigger is already registered | |
2801 | * with the same condition. | |
2802 | */ | |
2803 | client_list = get_client_list_from_condition(state, condition); | |
f2b3ef9f | 2804 | if (!client_list) { |
091fa780 FD |
2805 | /* |
2806 | * No client list for this condition yet. We create new | |
2807 | * one and build it up. | |
2808 | */ | |
2809 | client_list = notification_client_list_create(state, condition); | |
2810 | if (!client_list) { | |
2811 | ERR("Error creating notification client list for trigger %s", trigger->name); | |
2812 | goto error_free_ht_element; | |
f2b3ef9f | 2813 | } |
ab0ee2ca | 2814 | } |
f2b3ef9f | 2815 | |
091fa780 FD |
2816 | CDS_INIT_LIST_HEAD(&trigger_ht_element->client_list_trigger_node); |
2817 | ||
2818 | pthread_mutex_lock(&client_list->lock); | |
2819 | cds_list_add(&trigger_ht_element->client_list_trigger_node, &client_list->triggers_list); | |
2820 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca JG |
2821 | } |
2822 | ||
091fa780 FD |
2823 | /* |
2824 | * Ownership of the trigger and of its wrapper was transfered to | |
2825 | * the triggers_ht. Same for token ht element if necessary. | |
2826 | */ | |
2827 | trigger_ht_element = NULL; | |
2828 | free_trigger = false; | |
2829 | ||
f82f93a1 | 2830 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2831 | case LTTNG_OBJECT_TYPE_SESSION: |
2832 | /* Add the trigger to the list if it matches a known session. */ | |
2833 | ret = bind_trigger_to_matching_session(trigger, state); | |
2834 | if (ret) { | |
091fa780 | 2835 | goto error_free_ht_element; |
ab0ee2ca | 2836 | } |
f82f93a1 | 2837 | break; |
51eab943 JG |
2838 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2839 | /* | |
2840 | * Add the trigger to list of triggers bound to the channels | |
2841 | * currently known. | |
2842 | */ | |
2843 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2844 | if (ret) { | |
091fa780 | 2845 | goto error_free_ht_element; |
ab0ee2ca | 2846 | } |
51eab943 JG |
2847 | break; |
2848 | case LTTNG_OBJECT_TYPE_NONE: | |
2849 | break; | |
2850 | default: | |
f2b3ef9f | 2851 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2852 | ret = -1; |
091fa780 | 2853 | goto error_free_ht_element; |
ab0ee2ca JG |
2854 | } |
2855 | ||
2ae99f0b | 2856 | /* |
f2b3ef9f JG |
2857 | * The new trigger's condition must be evaluated against the current |
2858 | * state. | |
2859 | * | |
2860 | * In the case of `notify` action, nothing preventing clients from | |
2861 | * subscribing to a condition before the corresponding trigger is | |
2862 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2863 | * |
2864 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2865 | * reception of a channel sample) to evaluate this new condition, but | |
2866 | * that was broken. | |
2867 | * | |
2868 | * The reason it was broken is that waiting for the next sample | |
2869 | * does not allow us to properly handle transitions for edge-triggered | |
2870 | * conditions. | |
2871 | * | |
2872 | * Consider this example: when we handle a new channel sample, we | |
2873 | * evaluate each conditions twice: once with the previous state, and | |
2874 | * again with the newest state. We then use those two results to | |
2875 | * determine whether a state change happened: a condition was false and | |
2876 | * became true. If a state change happened, we have to notify clients. | |
2877 | * | |
2878 | * Now, if a client subscribes to a given notification and registers | |
2879 | * a trigger *after* that subscription, we have to make sure the | |
2880 | * condition is evaluated at this point while considering only the | |
2881 | * current state. Otherwise, the next evaluation cycle may only see | |
2882 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2883 | * the client will never know that the condition has been met. | |
2884 | */ | |
f2b3ef9f JG |
2885 | switch (get_condition_binding_object(condition)) { |
2886 | case LTTNG_OBJECT_TYPE_SESSION: | |
2887 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2888 | &evaluation, &object_uid, |
2889 | &object_gid); | |
bc8daafb JG |
2890 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2891 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2892 | break; |
f2b3ef9f JG |
2893 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2894 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2895 | &evaluation, &object_uid, |
2896 | &object_gid); | |
bc8daafb JG |
2897 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2898 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2899 | break; |
2900 | case LTTNG_OBJECT_TYPE_NONE: | |
2901 | ret = 0; | |
242388e4 | 2902 | break; |
f2b3ef9f JG |
2903 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2904 | default: | |
2905 | ret = -1; | |
242388e4 | 2906 | break; |
f2b3ef9f JG |
2907 | } |
2908 | ||
2909 | if (ret) { | |
2910 | /* Fatal error. */ | |
091fa780 | 2911 | goto error_free_ht_element; |
f2b3ef9f JG |
2912 | } |
2913 | ||
2914 | DBG("Newly registered trigger's condition evaluated to %s", | |
2915 | evaluation ? "true" : "false"); | |
2916 | if (!evaluation) { | |
2917 | /* Evaluation yielded nothing. Normal exit. */ | |
2918 | ret = 0; | |
091fa780 | 2919 | goto success; |
2ae99f0b JG |
2920 | } |
2921 | ||
2922 | /* | |
f2b3ef9f JG |
2923 | * Ownership of `evaluation` transferred to the action executor |
2924 | * no matter the result. | |
2ae99f0b | 2925 | */ |
72365501 JR |
2926 | executor_status = action_executor_enqueue_trigger(state->executor, |
2927 | trigger, evaluation, &object_creds, client_list); | |
f2b3ef9f JG |
2928 | evaluation = NULL; |
2929 | switch (executor_status) { | |
2930 | case ACTION_EXECUTOR_STATUS_OK: | |
2931 | break; | |
2932 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2933 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2934 | /* | |
2935 | * TODO Add trigger identification (name/id) when | |
2936 | * it is added to the API. | |
2937 | */ | |
2938 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2939 | ret = -1; | |
091fa780 | 2940 | goto error_free_ht_element; |
f2b3ef9f JG |
2941 | case ACTION_EXECUTOR_STATUS_OVERFLOW: |
2942 | /* | |
2943 | * TODO Add trigger identification (name/id) when | |
2944 | * it is added to the API. | |
2945 | * | |
2946 | * Not a fatal error. | |
2947 | */ | |
2948 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2949 | ret = 0; | |
091fa780 | 2950 | goto success; |
f2b3ef9f JG |
2951 | default: |
2952 | abort(); | |
2953 | } | |
2ae99f0b | 2954 | |
091fa780 | 2955 | success: |
ab0ee2ca | 2956 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2957 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2958 | trigger_name, trigger_tracer_token); | |
091fa780 | 2959 | goto end; |
505b2d90 | 2960 | |
ab0ee2ca | 2961 | error_free_ht_element: |
242388e4 JR |
2962 | if (trigger_ht_element) { |
2963 | /* Delayed removal due to RCU constraint on delete. */ | |
2964 | call_rcu(&trigger_ht_element->rcu_node, | |
2965 | free_lttng_trigger_ht_element_rcu); | |
2966 | } | |
ab0ee2ca JG |
2967 | error: |
2968 | if (free_trigger) { | |
9c374932 JR |
2969 | /* |
2970 | * Other objects might have a reference to the trigger, mark it | |
2971 | * as unregistered. | |
2972 | */ | |
2973 | lttng_trigger_set_as_unregistered(trigger); | |
ab0ee2ca JG |
2974 | lttng_trigger_destroy(trigger); |
2975 | } | |
091fa780 | 2976 | end: |
ab0ee2ca JG |
2977 | rcu_read_unlock(); |
2978 | return ret; | |
2979 | } | |
2980 | ||
83b934ad MD |
2981 | static |
2982 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2983 | { | |
2984 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2985 | rcu_node)); | |
2986 | } | |
2987 | ||
e7c93cf9 JR |
2988 | static |
2989 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
2990 | { | |
2991 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
2992 | rcu_node)); | |
2993 | } | |
2994 | ||
6487ad53 FD |
2995 | static |
2996 | void teardown_tracer_notifier(struct notification_thread_state *state, | |
2997 | const struct lttng_trigger *trigger) | |
2998 | { | |
2999 | struct cds_lfht_iter iter; | |
3000 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element; | |
3001 | ||
3002 | cds_lfht_for_each_entry(state->trigger_tokens_ht, &iter, | |
3003 | trigger_tokens_ht_element, node) { | |
3004 | ||
3005 | if (!lttng_trigger_is_equal(trigger, | |
3006 | trigger_tokens_ht_element->trigger)) { | |
3007 | continue; | |
3008 | } | |
3009 | ||
3010 | event_notifier_error_accounting_unregister_event_notifier( | |
3011 | trigger_tokens_ht_element->trigger); | |
3012 | ||
3013 | /* TODO talk to all app and remove it */ | |
f91c3842 | 3014 | DBG("Removed trigger from tokens_ht"); |
6487ad53 FD |
3015 | cds_lfht_del(state->trigger_tokens_ht, |
3016 | &trigger_tokens_ht_element->node); | |
3017 | ||
3018 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
3019 | free_notification_trigger_tokens_ht_element_rcu); | |
3020 | ||
3021 | break; | |
3022 | } | |
3023 | } | |
3024 | ||
cc2295b5 | 3025 | static |
ab0ee2ca JG |
3026 | int handle_notification_thread_command_unregister_trigger( |
3027 | struct notification_thread_state *state, | |
ac16173e | 3028 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
3029 | enum lttng_error_code *_cmd_reply) |
3030 | { | |
3031 | struct cds_lfht_iter iter; | |
ed327204 | 3032 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
3033 | struct lttng_channel_trigger_list *trigger_list; |
3034 | struct notification_client_list *client_list; | |
ab0ee2ca | 3035 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 3036 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 3037 | trigger); |
ab0ee2ca JG |
3038 | enum lttng_error_code cmd_reply; |
3039 | ||
3040 | rcu_read_lock(); | |
3041 | ||
3042 | cds_lfht_lookup(state->triggers_ht, | |
3043 | lttng_condition_hash(condition), | |
242388e4 JR |
3044 | match_trigger, |
3045 | trigger, | |
ab0ee2ca JG |
3046 | &iter); |
3047 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
3048 | if (!triggers_ht_node) { | |
3049 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
3050 | goto end; | |
3051 | } else { | |
3052 | cmd_reply = LTTNG_OK; | |
3053 | } | |
3054 | ||
9c374932 JR |
3055 | trigger_ht_element = caa_container_of(triggers_ht_node, |
3056 | struct lttng_trigger_ht_element, node); | |
3057 | ||
ab0ee2ca JG |
3058 | /* Remove trigger from channel_triggers_ht. */ |
3059 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
3060 | channel_triggers_ht_node) { | |
3061 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
3062 | ||
3063 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
3064 | &trigger_list->list, node) { | |
e8f7fa11 | 3065 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
3066 | continue; |
3067 | } | |
3068 | ||
f91c3842 | 3069 | DBG("Removed trigger from channel_triggers_ht"); |
ab0ee2ca | 3070 | cds_list_del(&trigger_element->node); |
e4db5ace JR |
3071 | /* A trigger can only appear once per channel */ |
3072 | break; | |
ab0ee2ca JG |
3073 | } |
3074 | } | |
3075 | ||
6487ad53 FD |
3076 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
3077 | teardown_tracer_notifier(state, trigger); | |
e7c93cf9 JR |
3078 | } |
3079 | ||
51367634 JR |
3080 | if (is_trigger_action_notify(trigger)) { |
3081 | /* | |
3082 | * Remove and release the client list from | |
3083 | * notification_trigger_clients_ht. | |
3084 | */ | |
3085 | client_list = get_client_list_from_condition(state, condition); | |
3086 | assert(client_list); | |
ed327204 | 3087 | |
091fa780 FD |
3088 | pthread_mutex_lock(&client_list->lock); |
3089 | cds_list_del(&trigger_ht_element->client_list_trigger_node); | |
3090 | pthread_mutex_unlock(&client_list->lock); | |
3091 | ||
51367634 JR |
3092 | /* Put new reference and the hashtable's reference. */ |
3093 | notification_client_list_put(client_list); | |
3094 | notification_client_list_put(client_list); | |
3095 | client_list = NULL; | |
3096 | } | |
ab0ee2ca | 3097 | |
2758e38b FD |
3098 | /* Remove trigger from triggers_ht. */ |
3099 | notif_thread_state_remove_trigger_ht_elem(state, trigger_ht_element); | |
ab0ee2ca | 3100 | |
7ca172c1 | 3101 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 3102 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 3103 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
3104 | end: |
3105 | rcu_read_unlock(); | |
3106 | if (_cmd_reply) { | |
3107 | *_cmd_reply = cmd_reply; | |
3108 | } | |
3109 | return 0; | |
3110 | } | |
3111 | ||
3112 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
3113 | int handle_notification_thread_command( | |
3114 | struct notification_thread_handle *handle, | |
3115 | struct notification_thread_state *state) | |
3116 | { | |
3117 | int ret; | |
3118 | uint64_t counter; | |
3119 | struct notification_thread_command *cmd; | |
3120 | ||
8abe313a | 3121 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 3122 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 3123 | sizeof(counter)); |
18aeca05 | 3124 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
3125 | goto error; |
3126 | } | |
3127 | ||
3128 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
3129 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
3130 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
3131 | cds_list_del(&cmd->cmd_list_node); |
3132 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
6900ae81 | 3133 | |
f91c3842 | 3134 | DBG("Received `%s` command", |
6900ae81 | 3135 | notification_command_type_str(cmd->type)); |
ab0ee2ca JG |
3136 | switch (cmd->type) { |
3137 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
3138 | ret = handle_notification_thread_command_register_trigger(state, |
3139 | cmd->parameters.register_trigger.trigger, | |
0efb2ad7 | 3140 | cmd->parameters.register_trigger.is_trigger_anonymous, |
ab0ee2ca JG |
3141 | &cmd->reply_code); |
3142 | break; | |
3143 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 3144 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
3145 | state, |
3146 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
3147 | &cmd->reply_code); |
3148 | break; | |
3149 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 3150 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
3151 | state, |
3152 | cmd->parameters.add_channel.session.name, | |
3153 | cmd->parameters.add_channel.session.uid, | |
3154 | cmd->parameters.add_channel.session.gid, | |
3155 | cmd->parameters.add_channel.channel.name, | |
3156 | cmd->parameters.add_channel.channel.domain, | |
3157 | cmd->parameters.add_channel.channel.key, | |
3158 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
3159 | &cmd->reply_code); |
3160 | break; | |
3161 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
3162 | ret = handle_notification_thread_command_remove_channel( |
3163 | state, cmd->parameters.remove_channel.key, | |
3164 | cmd->parameters.remove_channel.domain, | |
3165 | &cmd->reply_code); | |
3166 | break; | |
0ca52944 | 3167 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 3168 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 3169 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 3170 | state, |
ed327204 JG |
3171 | cmd->type, |
3172 | cmd->parameters.session_rotation.session_name, | |
3173 | cmd->parameters.session_rotation.uid, | |
3174 | cmd->parameters.session_rotation.gid, | |
3175 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
3176 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
3177 | &cmd->reply_code); |
3178 | break; | |
d02d7404 JR |
3179 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
3180 | ret = handle_notification_thread_command_add_tracer_event_source( | |
3181 | state, | |
3182 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3183 | cmd->parameters.tracer_event_source.domain, | |
3184 | &cmd->reply_code); | |
3185 | break; | |
3186 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
3187 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
3188 | state, | |
3189 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3190 | &cmd->reply_code); | |
3191 | break; | |
fbc9f37d JR |
3192 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
3193 | { | |
3194 | struct lttng_triggers *triggers = NULL; | |
3195 | ||
3196 | ret = handle_notification_thread_command_list_triggers( | |
3197 | handle, | |
3198 | state, | |
3199 | cmd->parameters.list_triggers.uid, | |
3200 | &triggers, | |
3201 | &cmd->reply_code); | |
3202 | cmd->reply.list_triggers.triggers = triggers; | |
3203 | ret = 0; | |
3204 | break; | |
3205 | } | |
ab0ee2ca | 3206 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
3207 | cmd->reply_code = LTTNG_OK; |
3208 | ret = 1; | |
3209 | goto end; | |
8790759c FD |
3210 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
3211 | { | |
3212 | struct lttng_trigger *trigger = NULL; | |
3213 | ||
3214 | ret = handle_notification_thread_command_get_trigger(state, | |
3215 | cmd->parameters.get_trigger.trigger, &trigger, | |
3216 | &cmd->reply_code); | |
3217 | cmd->reply.get_trigger.trigger = trigger; | |
3218 | break; | |
3219 | } | |
f2b3ef9f JG |
3220 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
3221 | { | |
3222 | const enum client_transmission_status client_status = | |
3223 | cmd->parameters.client_communication_update | |
3224 | .status; | |
3225 | const notification_client_id client_id = | |
3226 | cmd->parameters.client_communication_update.id; | |
3227 | struct notification_client *client; | |
3228 | ||
3229 | rcu_read_lock(); | |
3230 | client = get_client_from_id(client_id, state); | |
3231 | ||
3232 | if (!client) { | |
3233 | /* | |
3234 | * Client error was probably already picked-up by the | |
3235 | * notification thread or it has disconnected | |
3236 | * gracefully while this command was queued. | |
3237 | */ | |
3238 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
3239 | client_id); | |
3240 | ret = 0; | |
3241 | } else { | |
f2b3ef9f JG |
3242 | ret = client_handle_transmission_status( |
3243 | client, client_status, state); | |
f2b3ef9f JG |
3244 | } |
3245 | rcu_read_unlock(); | |
3246 | break; | |
3247 | } | |
ab0ee2ca | 3248 | default: |
f91c3842 | 3249 | ERR("Unknown internal command received"); |
ab0ee2ca JG |
3250 | goto error_unlock; |
3251 | } | |
3252 | ||
3253 | if (ret) { | |
3254 | goto error_unlock; | |
3255 | } | |
3256 | end: | |
0ab399e0 JG |
3257 | if (cmd->is_async) { |
3258 | free(cmd); | |
3259 | cmd = NULL; | |
3260 | } else { | |
3261 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3262 | } | |
ab0ee2ca JG |
3263 | return ret; |
3264 | error_unlock: | |
3265 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3266 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3267 | cmd->reply_code = LTTNG_ERR_FATAL; |
3268 | error: | |
3269 | /* Indicate a fatal error to the caller. */ | |
3270 | return -1; | |
3271 | } | |
3272 | ||
ab0ee2ca JG |
3273 | static |
3274 | int socket_set_non_blocking(int socket) | |
3275 | { | |
3276 | int ret, flags; | |
3277 | ||
3278 | /* Set the pipe as non-blocking. */ | |
3279 | ret = fcntl(socket, F_GETFL, 0); | |
3280 | if (ret == -1) { | |
3281 | PERROR("fcntl get socket flags"); | |
3282 | goto end; | |
3283 | } | |
3284 | flags = ret; | |
3285 | ||
3286 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3287 | if (ret == -1) { | |
3288 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3289 | goto end; | |
3290 | } | |
3291 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3292 | end: | |
3293 | return ret; | |
3294 | } | |
3295 | ||
3296 | static | |
14fa22f8 | 3297 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3298 | { |
3299 | int ret; | |
3300 | ||
882093ee JR |
3301 | |
3302 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3303 | |
3304 | client->communication.inbound.bytes_to_receive = | |
3305 | sizeof(struct lttng_notification_channel_message); | |
3306 | client->communication.inbound.msg_type = | |
3307 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3308 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3309 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3310 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3311 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3312 | client->communication.inbound.bytes_to_receive); |
882093ee | 3313 | |
14fa22f8 | 3314 | return ret; |
ab0ee2ca JG |
3315 | } |
3316 | ||
3317 | int handle_notification_thread_client_connect( | |
3318 | struct notification_thread_state *state) | |
3319 | { | |
3320 | int ret; | |
3321 | struct notification_client *client; | |
3322 | ||
f91c3842 | 3323 | DBG("Handling new notification channel client connection"); |
ab0ee2ca JG |
3324 | |
3325 | client = zmalloc(sizeof(*client)); | |
3326 | if (!client) { | |
3327 | /* Fatal error. */ | |
3328 | ret = -1; | |
3329 | goto error; | |
3330 | } | |
6c24d3fd | 3331 | |
505b2d90 | 3332 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3333 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3334 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3335 | lttng_payload_init(&client->communication.inbound.payload); |
3336 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3337 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3338 | |
14fa22f8 JG |
3339 | ret = client_reset_inbound_state(client); |
3340 | if (ret) { | |
f91c3842 | 3341 | ERR("Failed to reset client communication's inbound state"); |
e742b055 | 3342 | ret = 0; |
14fa22f8 JG |
3343 | goto error; |
3344 | } | |
ab0ee2ca JG |
3345 | |
3346 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3347 | if (ret < 0) { | |
f91c3842 | 3348 | ERR("Failed to accept new notification channel client connection"); |
ab0ee2ca JG |
3349 | ret = 0; |
3350 | goto error; | |
3351 | } | |
3352 | ||
3353 | client->socket = ret; | |
3354 | ||
3355 | ret = socket_set_non_blocking(client->socket); | |
3356 | if (ret) { | |
f91c3842 | 3357 | ERR("Failed to set new notification channel client connection socket as non-blocking"); |
ab0ee2ca JG |
3358 | goto error; |
3359 | } | |
3360 | ||
3361 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3362 | if (ret < 0) { | |
f91c3842 | 3363 | ERR("Failed to set socket options on new notification channel client socket"); |
ab0ee2ca JG |
3364 | ret = 0; |
3365 | goto error; | |
3366 | } | |
3367 | ||
3368 | ret = lttng_poll_add(&state->events, client->socket, | |
3369 | LPOLLIN | LPOLLERR | | |
3370 | LPOLLHUP | LPOLLRDHUP); | |
3371 | if (ret < 0) { | |
f91c3842 | 3372 | ERR("Failed to add notification channel client socket to poll set"); |
ab0ee2ca JG |
3373 | ret = 0; |
3374 | goto error; | |
3375 | } | |
f91c3842 | 3376 | DBG("Added new notification channel client socket (%i) to poll set", |
ab0ee2ca JG |
3377 | client->socket); |
3378 | ||
ab0ee2ca JG |
3379 | rcu_read_lock(); |
3380 | cds_lfht_add(state->client_socket_ht, | |
3381 | hash_client_socket(client->socket), | |
3382 | &client->client_socket_ht_node); | |
ac1889bf JG |
3383 | cds_lfht_add(state->client_id_ht, |
3384 | hash_client_id(client->id), | |
3385 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3386 | rcu_read_unlock(); |
3387 | ||
3388 | return ret; | |
6c24d3fd | 3389 | |
ab0ee2ca JG |
3390 | error: |
3391 | notification_client_destroy(client, state); | |
3392 | return ret; | |
3393 | } | |
3394 | ||
6c24d3fd JG |
3395 | /* |
3396 | * RCU read-lock must be held by the caller. | |
3397 | * Client lock must _not_ be held by the caller. | |
3398 | */ | |
505b2d90 JG |
3399 | static |
3400 | int notification_thread_client_disconnect( | |
3401 | struct notification_client *client, | |
ab0ee2ca | 3402 | struct notification_thread_state *state) |
505b2d90 JG |
3403 | { |
3404 | int ret; | |
3405 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3406 | ||
3407 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 3408 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3409 | client->communication.active = false; |
6c24d3fd JG |
3410 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3411 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3412 | pthread_mutex_unlock(&client->lock); | |
3413 | ||
505b2d90 JG |
3414 | ret = lttng_poll_del(&state->events, client->socket); |
3415 | if (ret) { | |
f91c3842 | 3416 | ERR("Failed to remove client socket %d from poll set", |
505b2d90 JG |
3417 | client->socket); |
3418 | } | |
3419 | ||
505b2d90 JG |
3420 | /* Release all conditions to which the client was subscribed. */ |
3421 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3422 | &client->condition_list, node) { | |
3423 | (void) notification_thread_client_unsubscribe(client, | |
3424 | condition_list_element->condition, state, NULL); | |
3425 | } | |
3426 | ||
3427 | /* | |
3428 | * Client no longer accessible to other threads (through the | |
3429 | * client lists). | |
3430 | */ | |
3431 | notification_client_destroy(client, state); | |
3432 | return ret; | |
3433 | } | |
3434 | ||
3435 | int handle_notification_thread_client_disconnect( | |
3436 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3437 | { |
3438 | int ret = 0; | |
3439 | struct notification_client *client; | |
3440 | ||
3441 | rcu_read_lock(); | |
f91c3842 | 3442 | DBG("Closing client connection (socket fd = %i)", |
ab0ee2ca JG |
3443 | client_socket); |
3444 | client = get_client_from_socket(client_socket, state); | |
3445 | if (!client) { | |
3446 | /* Internal state corruption, fatal error. */ | |
f91c3842 | 3447 | ERR("Unable to find client (socket fd = %i)", |
ab0ee2ca JG |
3448 | client_socket); |
3449 | ret = -1; | |
3450 | goto end; | |
3451 | } | |
3452 | ||
505b2d90 | 3453 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3454 | end: |
3455 | rcu_read_unlock(); | |
3456 | return ret; | |
3457 | } | |
3458 | ||
3459 | int handle_notification_thread_client_disconnect_all( | |
3460 | struct notification_thread_state *state) | |
3461 | { | |
3462 | struct cds_lfht_iter iter; | |
3463 | struct notification_client *client; | |
3464 | bool error_encoutered = false; | |
3465 | ||
3466 | rcu_read_lock(); | |
f91c3842 | 3467 | DBG("Closing all client connections"); |
ab0ee2ca | 3468 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, |
505b2d90 | 3469 | client_socket_ht_node) { |
ab0ee2ca JG |
3470 | int ret; |
3471 | ||
505b2d90 JG |
3472 | ret = notification_thread_client_disconnect( |
3473 | client, state); | |
ab0ee2ca JG |
3474 | if (ret) { |
3475 | error_encoutered = true; | |
3476 | } | |
3477 | } | |
3478 | rcu_read_unlock(); | |
3479 | return error_encoutered ? 1 : 0; | |
3480 | } | |
3481 | ||
3482 | int handle_notification_thread_trigger_unregister_all( | |
3483 | struct notification_thread_state *state) | |
3484 | { | |
4149ace8 | 3485 | bool error_occurred = false; |
ab0ee2ca JG |
3486 | struct cds_lfht_iter iter; |
3487 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3488 | ||
763de384 | 3489 | rcu_read_lock(); |
ab0ee2ca JG |
3490 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3491 | node) { | |
3492 | int ret = handle_notification_thread_command_unregister_trigger( | |
3493 | state, trigger_ht_element->trigger, NULL); | |
3494 | if (ret) { | |
4149ace8 | 3495 | error_occurred = true; |
ab0ee2ca JG |
3496 | } |
3497 | } | |
763de384 | 3498 | rcu_read_unlock(); |
4149ace8 | 3499 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3500 | } |
3501 | ||
dd877ea6 JG |
3502 | static |
3503 | int client_handle_transmission_status( | |
3504 | struct notification_client *client, | |
3505 | enum client_transmission_status transmission_status, | |
3506 | struct notification_thread_state *state) | |
3507 | { | |
3508 | int ret = 0; | |
3509 | ||
3510 | switch (transmission_status) { | |
3511 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3512 | ret = lttng_poll_mod(&state->events, client->socket, | |
3513 | CLIENT_POLL_MASK_IN); | |
3514 | if (ret) { | |
3515 | goto end; | |
3516 | } | |
3517 | ||
dd877ea6 JG |
3518 | break; |
3519 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3520 | /* | |
3521 | * We want to be notified whenever there is buffer space | |
3522 | * available to send the rest of the payload. | |
3523 | */ | |
3524 | ret = lttng_poll_mod(&state->events, client->socket, | |
3525 | CLIENT_POLL_MASK_IN_OUT); | |
3526 | if (ret) { | |
3527 | goto end; | |
3528 | } | |
3529 | break; | |
3530 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3531 | ret = notification_thread_client_disconnect(client, state); | |
3532 | if (ret) { | |
3533 | goto end; | |
3534 | } | |
3535 | break; | |
3536 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3537 | ret = -1; | |
3538 | goto end; | |
3539 | default: | |
3540 | abort(); | |
3541 | } | |
3542 | end: | |
3543 | return ret; | |
3544 | } | |
3545 | ||
505b2d90 | 3546 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3547 | static |
dd877ea6 | 3548 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3549 | struct notification_client *client) |
ab0ee2ca JG |
3550 | { |
3551 | ssize_t ret; | |
3552 | size_t to_send_count; | |
dd877ea6 | 3553 | enum client_transmission_status status; |
882093ee JR |
3554 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3555 | &client->communication.outbound.payload, 0, -1); | |
3556 | const int fds_to_send_count = | |
3557 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3558 | |
505b2d90 JG |
3559 | ASSERT_LOCKED(client->lock); |
3560 | ||
f2b3ef9f JG |
3561 | if (!client->communication.active) { |
3562 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3563 | goto end; | |
3564 | } | |
3565 | ||
882093ee JR |
3566 | if (pv.buffer.size == 0) { |
3567 | /* | |
3568 | * If both data and fds are equal to zero, we are in an invalid | |
3569 | * state. | |
3570 | */ | |
3571 | assert(fds_to_send_count != 0); | |
3572 | goto send_fds; | |
3573 | } | |
3574 | ||
3575 | /* Send data. */ | |
3576 | to_send_count = pv.buffer.size; | |
f91c3842 | 3577 | DBG("Flushing client (socket fd = %i) outgoing queue", |
ab0ee2ca JG |
3578 | client->socket); |
3579 | ||
3580 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3581 | pv.buffer.data, |
ab0ee2ca | 3582 | to_send_count); |
44c180ca | 3583 | if ((ret >= 0 && ret < to_send_count)) { |
f91c3842 | 3584 | DBG("Client (socket fd = %i) outgoing queue could not be completely flushed", |
ab0ee2ca JG |
3585 | client->socket); |
3586 | to_send_count -= max(ret, 0); | |
3587 | ||
6f110534 | 3588 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3589 | pv.buffer.data + |
3590 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3591 | to_send_count); |
3592 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3593 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3594 | to_send_count); |
3595 | if (ret) { | |
3596 | goto error; | |
3597 | } | |
6c24d3fd | 3598 | |
dd877ea6 | 3599 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3600 | goto end; |
ab0ee2ca | 3601 | } else if (ret < 0) { |
6c24d3fd | 3602 | /* Generic error, disable the client's communication. */ |
f91c3842 | 3603 | ERR("Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3604 | client->socket); |
6c24d3fd | 3605 | client->communication.active = false; |
dd877ea6 | 3606 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3607 | goto end; |
ab0ee2ca | 3608 | } else { |
882093ee JR |
3609 | /* |
3610 | * No error and flushed the queue completely. | |
3611 | * | |
3612 | * The payload buffer size is used later to | |
3613 | * check if there is notifications queued. So albeit that the | |
3614 | * direct caller knows that the transmission is complete, we | |
3615 | * need to set the buffer size to zero. | |
3616 | */ | |
ab0ee2ca | 3617 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3618 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3619 | if (ret) { |
3620 | goto error; | |
3621 | } | |
882093ee | 3622 | } |
6c24d3fd | 3623 | |
882093ee JR |
3624 | send_fds: |
3625 | /* No fds to send, transmission is complete. */ | |
3626 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3627 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3628 | goto end; |
dd877ea6 | 3629 | } |
882093ee JR |
3630 | |
3631 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3632 | client->socket, &pv); | |
3633 | if (ret < 0) { | |
3634 | /* Generic error, disable the client's communication. */ | |
f91c3842 | 3635 | ERR("Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", |
882093ee JR |
3636 | client->socket); |
3637 | client->communication.active = false; | |
3638 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3639 | goto end; | |
3640 | } else if (ret == 0) { | |
3641 | /* Nothing could be sent. */ | |
3642 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3643 | } else { | |
3644 | /* Fd passing is an all or nothing kind of thing. */ | |
3645 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3646 | /* | |
3647 | * The payload _fd_array count is used later to | |
3648 | * check if there is notifications queued. So although the | |
3649 | * direct caller knows that the transmission is complete, we | |
3650 | * need to clear the _fd_array for the queuing check. | |
3651 | */ | |
3652 | lttng_dynamic_pointer_array_clear( | |
3653 | &client->communication.outbound.payload | |
3654 | ._fd_handles); | |
3655 | } | |
3656 | ||
f2b3ef9f | 3657 | end: |
882093ee JR |
3658 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3659 | client->communication.outbound.queued_command_reply = false; | |
3660 | client->communication.outbound.dropped_notification = false; | |
3661 | lttng_payload_clear(&client->communication.outbound.payload); | |
3662 | } | |
3663 | ||
f2b3ef9f | 3664 | return status; |
ab0ee2ca | 3665 | error: |
f2b3ef9f | 3666 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3667 | } |
3668 | ||
882093ee JR |
3669 | static |
3670 | bool client_has_outbound_data_left( | |
3671 | const struct notification_client *client) | |
3672 | { | |
3673 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3674 | &client->communication.outbound.payload, 0, -1); | |
3675 | const bool has_data = pv.buffer.size != 0; | |
3676 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3677 | ||
3678 | return has_data || has_fds; | |
3679 | } | |
3680 | ||
6c24d3fd | 3681 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3682 | static |
3683 | int client_send_command_reply(struct notification_client *client, | |
3684 | struct notification_thread_state *state, | |
3685 | enum lttng_notification_channel_status status) | |
3686 | { | |
3687 | int ret; | |
3688 | struct lttng_notification_channel_command_reply reply = { | |
3689 | .status = (int8_t) status, | |
3690 | }; | |
3691 | struct lttng_notification_channel_message msg = { | |
3692 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3693 | .size = sizeof(reply), | |
3694 | }; | |
3695 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3696 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3697 | |
6c24d3fd JG |
3698 | memcpy(buffer, &msg, sizeof(msg)); |
3699 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
f91c3842 | 3700 | DBG("Send command reply (%i)", (int) status); |
505b2d90 | 3701 | |
6c24d3fd | 3702 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3703 | if (client->communication.outbound.queued_command_reply) { |
3704 | /* Protocol error. */ | |
6c24d3fd | 3705 | goto error_unlock; |
ab0ee2ca JG |
3706 | } |
3707 | ||
ab0ee2ca JG |
3708 | /* Enqueue buffer to outgoing queue and flush it. */ |
3709 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3710 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3711 | buffer, sizeof(buffer)); |
3712 | if (ret) { | |
6c24d3fd | 3713 | goto error_unlock; |
ab0ee2ca JG |
3714 | } |
3715 | ||
f2b3ef9f | 3716 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3717 | |
3718 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3719 | /* Queue could not be emptied. */ |
3720 | client->communication.outbound.queued_command_reply = true; | |
3721 | } | |
3722 | ||
3723 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3724 | ret = client_handle_transmission_status( |
3725 | client, transmission_status, state); | |
ab0ee2ca JG |
3726 | if (ret) { |
3727 | goto error; | |
3728 | } | |
3729 | ||
ab0ee2ca | 3730 | return 0; |
6c24d3fd JG |
3731 | error_unlock: |
3732 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3733 | error: |
3734 | return -1; | |
3735 | } | |
3736 | ||
505b2d90 JG |
3737 | static |
3738 | int client_handle_message_unknown(struct notification_client *client, | |
3739 | struct notification_thread_state *state) | |
3740 | { | |
3741 | int ret; | |
505b2d90 JG |
3742 | /* |
3743 | * Receiving message header. The function will be called again | |
3744 | * once the rest of the message as been received and can be | |
3745 | * interpreted. | |
3746 | */ | |
3747 | const struct lttng_notification_channel_message *msg; | |
3748 | ||
882093ee | 3749 | assert(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3750 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3751 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3752 | |
3753 | if (msg->size == 0 || | |
3754 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
f91c3842 | 3755 | ERR("Invalid notification channel message: length = %u", |
505b2d90 JG |
3756 | msg->size); |
3757 | ret = -1; | |
3758 | goto end; | |
3759 | } | |
3760 | ||
3761 | switch (msg->type) { | |
3762 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3763 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3764 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3765 | break; | |
3766 | default: | |
3767 | ret = -1; | |
f91c3842 | 3768 | ERR("Invalid notification channel message: unexpected message type"); |
505b2d90 JG |
3769 | goto end; |
3770 | } | |
3771 | ||
3772 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3773 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3774 | client->communication.inbound.msg_type = |
3775 | (enum lttng_notification_channel_message_type) msg->type; | |
3776 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3777 | &client->communication.inbound.payload.buffer, msg->size); |
3778 | ||
3779 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3780 | msg = NULL; | |
505b2d90 | 3781 | end: |
505b2d90 JG |
3782 | return ret; |
3783 | } | |
3784 | ||
3785 | static | |
3786 | int client_handle_message_handshake(struct notification_client *client, | |
3787 | struct notification_thread_state *state) | |
3788 | { | |
3789 | int ret; | |
3790 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3791 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3792 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3793 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3794 | }; | |
3795 | const struct lttng_notification_channel_message msg_header = { | |
3796 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3797 | .size = sizeof(handshake_reply), | |
3798 | }; | |
3799 | enum lttng_notification_channel_status status = | |
3800 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3801 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3802 | |
3803 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3804 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3805 | sizeof(handshake_reply)); | |
3806 | ||
3807 | handshake_client = | |
3808 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3809 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3810 | .data; |
3811 | client->major = handshake_client->major; | |
3812 | client->minor = handshake_client->minor; | |
3813 | if (!client->communication.inbound.creds_received) { | |
f91c3842 | 3814 | ERR("No credentials received from client"); |
505b2d90 JG |
3815 | ret = -1; |
3816 | goto end; | |
3817 | } | |
3818 | ||
3819 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3820 | &client->communication.inbound.creds); | |
3821 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3822 | &client->communication.inbound.creds); | |
5682b2e6 JG |
3823 | client->is_sessiond = LTTNG_SOCK_GET_PID_CRED(&client->communication.inbound.creds) == getpid(); |
3824 | DBG("Received handshake from client: uid = %u, gid = %u, protocol version = %i.%i, client is sessiond = %s", | |
505b2d90 | 3825 | client->uid, client->gid, (int) client->major, |
5682b2e6 JG |
3826 | (int) client->minor, |
3827 | client->is_sessiond ? "true" : "false"); | |
505b2d90 JG |
3828 | |
3829 | if (handshake_client->major != | |
3830 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3831 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3832 | } | |
3833 | ||
6c24d3fd JG |
3834 | pthread_mutex_lock(&client->lock); |
3835 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3836 | ret = lttng_dynamic_buffer_append( |
882093ee | 3837 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3838 | sizeof(send_buffer)); |
3839 | if (ret) { | |
f91c3842 | 3840 | ERR("Failed to send protocol version to notification channel client"); |
6c24d3fd | 3841 | goto end_unlock; |
505b2d90 JG |
3842 | } |
3843 | ||
3844 | client->validated = true; | |
3845 | client->communication.active = true; | |
6c24d3fd | 3846 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3847 | |
6c24d3fd JG |
3848 | /* Set reception state to receive the next message header. */ |
3849 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3850 | if (ret) { |
f91c3842 | 3851 | ERR("Failed to reset client communication's inbound state"); |
505b2d90 JG |
3852 | goto end; |
3853 | } | |
3854 | ||
6c24d3fd | 3855 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3856 | ret = client_send_command_reply(client, state, status); |
3857 | if (ret) { | |
f91c3842 | 3858 | ERR("Failed to send reply to notification channel client"); |
505b2d90 JG |
3859 | goto end; |
3860 | } | |
3861 | ||
6c24d3fd JG |
3862 | goto end; |
3863 | end_unlock: | |
505b2d90 | 3864 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3865 | end: |
505b2d90 JG |
3866 | return ret; |
3867 | } | |
3868 | ||
3869 | static | |
3870 | int client_handle_message_subscription( | |
3871 | struct notification_client *client, | |
3872 | enum lttng_notification_channel_message_type msg_type, | |
3873 | struct notification_thread_state *state) | |
3874 | { | |
3875 | int ret; | |
3876 | struct lttng_condition *condition; | |
3877 | enum lttng_notification_channel_status status = | |
3878 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3879 | struct lttng_payload_view condition_view = | |
882093ee JR |
3880 | lttng_payload_view_from_payload( |
3881 | &client->communication.inbound.payload, | |
505b2d90 JG |
3882 | 0, -1); |
3883 | size_t expected_condition_size; | |
3884 | ||
6c24d3fd JG |
3885 | /* |
3886 | * No need to lock client to sample the inbound state as the only | |
3887 | * other thread accessing clients (action executor) only uses the | |
3888 | * outbound state. | |
3889 | */ | |
882093ee | 3890 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3891 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3892 | if (ret != expected_condition_size) { | |
f91c3842 | 3893 | ERR("Malformed condition received from client"); |
505b2d90 JG |
3894 | goto end; |
3895 | } | |
3896 | ||
5a6306f7 | 3897 | /* Ownership of condition is always transferred. */ |
505b2d90 JG |
3898 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { |
3899 | ret = notification_thread_client_subscribe( | |
3900 | client, condition, state, &status); | |
3901 | } else { | |
3902 | ret = notification_thread_client_unsubscribe( | |
3903 | client, condition, state, &status); | |
3904 | } | |
505b2d90 | 3905 | |
505b2d90 | 3906 | if (ret) { |
6c24d3fd | 3907 | goto end; |
505b2d90 JG |
3908 | } |
3909 | ||
3910 | /* Set reception state to receive the next message header. */ | |
3911 | ret = client_reset_inbound_state(client); | |
3912 | if (ret) { | |
f91c3842 | 3913 | ERR("Failed to reset client communication's inbound state"); |
6c24d3fd JG |
3914 | goto end; |
3915 | } | |
3916 | ||
3917 | ret = client_send_command_reply(client, state, status); | |
3918 | if (ret) { | |
f91c3842 | 3919 | ERR("Failed to send reply to notification channel client"); |
6c24d3fd | 3920 | goto end; |
505b2d90 JG |
3921 | } |
3922 | ||
505b2d90 JG |
3923 | end: |
3924 | return ret; | |
3925 | } | |
3926 | ||
ab0ee2ca JG |
3927 | static |
3928 | int client_dispatch_message(struct notification_client *client, | |
3929 | struct notification_thread_state *state) | |
3930 | { | |
3931 | int ret = 0; | |
3932 | ||
3933 | if (client->communication.inbound.msg_type != | |
3934 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3935 | client->communication.inbound.msg_type != | |
3936 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3937 | !client->validated) { | |
f91c3842 | 3938 | WARN("client attempted a command before handshake"); |
ab0ee2ca JG |
3939 | ret = -1; |
3940 | goto end; | |
3941 | } | |
3942 | ||
3943 | switch (client->communication.inbound.msg_type) { | |
3944 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3945 | { | |
505b2d90 | 3946 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3947 | break; |
3948 | } | |
3949 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3950 | { | |
505b2d90 | 3951 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3952 | break; |
3953 | } | |
3954 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3955 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3956 | { | |
505b2d90 JG |
3957 | ret = client_handle_message_subscription(client, |
3958 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3959 | break; |
3960 | } | |
3961 | default: | |
3962 | abort(); | |
3963 | } | |
3964 | end: | |
3965 | return ret; | |
3966 | } | |
3967 | ||
3968 | /* Incoming data from client. */ | |
3969 | int handle_notification_thread_client_in( | |
3970 | struct notification_thread_state *state, int socket) | |
3971 | { | |
14fa22f8 | 3972 | int ret = 0; |
ab0ee2ca JG |
3973 | struct notification_client *client; |
3974 | ssize_t recv_ret; | |
3975 | size_t offset; | |
3976 | ||
98b5ff34 | 3977 | rcu_read_lock(); |
ab0ee2ca JG |
3978 | client = get_client_from_socket(socket, state); |
3979 | if (!client) { | |
3980 | /* Internal error, abort. */ | |
3981 | ret = -1; | |
3982 | goto end; | |
3983 | } | |
3984 | ||
5ca80799 JR |
3985 | if (client->communication.inbound.bytes_to_receive == 0 && |
3986 | client->communication.inbound.fds_to_receive != 0) { | |
3987 | /* Only FDs left to receive. */ | |
3988 | goto receive_fds; | |
3989 | } | |
3990 | ||
882093ee | 3991 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3992 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3993 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3994 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3995 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3996 | client->communication.inbound.bytes_to_receive, |
3997 | &client->communication.inbound.creds); | |
3998 | if (recv_ret > 0) { | |
01ea340e | 3999 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
4000 | client->communication.inbound.creds_received = true; |
4001 | } | |
4002 | } else { | |
4003 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 4004 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
4005 | client->communication.inbound.bytes_to_receive); |
4006 | } | |
505b2d90 JG |
4007 | if (recv_ret >= 0) { |
4008 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
4009 | } else { |
4010 | goto error_disconnect_client; | |
505b2d90 | 4011 | } |
6c24d3fd | 4012 | |
882093ee JR |
4013 | if (client->communication.inbound.bytes_to_receive != 0) { |
4014 | /* Message incomplete wait for more data. */ | |
4015 | ret = 0; | |
4016 | goto end; | |
ab0ee2ca JG |
4017 | } |
4018 | ||
5ca80799 | 4019 | receive_fds: |
882093ee JR |
4020 | assert(client->communication.inbound.bytes_to_receive == 0); |
4021 | ||
4022 | /* Receive fds. */ | |
4023 | if (client->communication.inbound.fds_to_receive != 0) { | |
4024 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
4025 | client->socket, | |
4026 | client->communication.inbound.fds_to_receive, | |
4027 | &client->communication.inbound.payload); | |
4028 | if (ret > 0) { | |
ab0ee2ca | 4029 | /* |
882093ee JR |
4030 | * Fds received. non blocking fds passing is all |
4031 | * or nothing. | |
ab0ee2ca | 4032 | */ |
882093ee JR |
4033 | ssize_t expected_size; |
4034 | ||
4035 | expected_size = sizeof(int) * | |
4036 | client->communication.inbound | |
4037 | .fds_to_receive; | |
4038 | assert(ret == expected_size); | |
4039 | client->communication.inbound.fds_to_receive = 0; | |
4040 | } else if (ret == 0) { | |
4041 | /* Received nothing. */ | |
4042 | ret = 0; | |
4043 | goto end; | |
4044 | } else { | |
ab0ee2ca JG |
4045 | goto error_disconnect_client; |
4046 | } | |
ab0ee2ca | 4047 | } |
882093ee JR |
4048 | |
4049 | /* At this point the message is complete.*/ | |
4050 | assert(client->communication.inbound.bytes_to_receive == 0 && | |
4051 | client->communication.inbound.fds_to_receive == 0); | |
4052 | ret = client_dispatch_message(client, state); | |
4053 | if (ret) { | |
4054 | /* | |
4055 | * Only returns an error if this client must be | |
4056 | * disconnected. | |
4057 | */ | |
4058 | goto error_disconnect_client; | |
4059 | } | |
4060 | ||
ab0ee2ca | 4061 | end: |
98b5ff34 | 4062 | rcu_read_unlock(); |
ab0ee2ca | 4063 | return ret; |
882093ee | 4064 | |
ab0ee2ca | 4065 | error_disconnect_client: |
505b2d90 | 4066 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 4067 | goto end; |
ab0ee2ca JG |
4068 | } |
4069 | ||
4070 | /* Client ready to receive outgoing data. */ | |
4071 | int handle_notification_thread_client_out( | |
4072 | struct notification_thread_state *state, int socket) | |
4073 | { | |
4074 | int ret; | |
4075 | struct notification_client *client; | |
f2b3ef9f | 4076 | enum client_transmission_status transmission_status; |
ab0ee2ca | 4077 | |
98b5ff34 | 4078 | rcu_read_lock(); |
ab0ee2ca JG |
4079 | client = get_client_from_socket(socket, state); |
4080 | if (!client) { | |
4081 | /* Internal error, abort. */ | |
4082 | ret = -1; | |
4083 | goto end; | |
4084 | } | |
4085 | ||
505b2d90 | 4086 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 4087 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
4088 | pthread_mutex_unlock(&client->lock); |
4089 | ||
f2b3ef9f JG |
4090 | ret = client_handle_transmission_status( |
4091 | client, transmission_status, state); | |
ab0ee2ca JG |
4092 | if (ret) { |
4093 | goto end; | |
4094 | } | |
4095 | end: | |
98b5ff34 | 4096 | rcu_read_unlock(); |
ab0ee2ca JG |
4097 | return ret; |
4098 | } | |
4099 | ||
4100 | static | |
e8360425 JD |
4101 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
4102 | const struct channel_state_sample *sample, | |
4103 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
4104 | { |
4105 | bool result = false; | |
4106 | uint64_t threshold; | |
4107 | enum lttng_condition_type condition_type; | |
e8360425 | 4108 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
4109 | condition, struct lttng_condition_buffer_usage, |
4110 | parent); | |
4111 | ||
ab0ee2ca JG |
4112 | if (use_condition->threshold_bytes.set) { |
4113 | threshold = use_condition->threshold_bytes.value; | |
4114 | } else { | |
4115 | /* | |
4116 | * Threshold was expressed as a ratio. | |
4117 | * | |
4118 | * TODO the threshold (in bytes) of conditions expressed | |
4119 | * as a ratio of total buffer size could be cached to | |
4120 | * forego this double-multiplication or it could be performed | |
4121 | * as fixed-point math. | |
4122 | * | |
d49487dc | 4123 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
4124 | * condition applies to multiple channels (i.e. don't assume |
4125 | * that all channels matching my_chann* have the same size...) | |
4126 | */ | |
4127 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
4128 | (double) buffer_capacity); | |
4129 | } | |
4130 | ||
4131 | condition_type = lttng_condition_get_type(condition); | |
4132 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
f91c3842 | 4133 | DBG("Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4134 | threshold, sample->highest_usage); |
4135 | ||
4136 | /* | |
4137 | * The low condition should only be triggered once _all_ of the | |
4138 | * streams in a channel have gone below the "low" threshold. | |
4139 | */ | |
4140 | if (sample->highest_usage <= threshold) { | |
4141 | result = true; | |
4142 | } | |
4143 | } else { | |
f91c3842 | 4144 | DBG("High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4145 | threshold, sample->highest_usage); |
4146 | ||
4147 | /* | |
4148 | * For high buffer usage scenarios, we want to trigger whenever | |
4149 | * _any_ of the streams has reached the "high" threshold. | |
4150 | */ | |
4151 | if (sample->highest_usage >= threshold) { | |
4152 | result = true; | |
4153 | } | |
4154 | } | |
e8360425 | 4155 | |
ab0ee2ca JG |
4156 | return result; |
4157 | } | |
4158 | ||
4159 | static | |
e8360425 JD |
4160 | bool evaluate_session_consumed_size_condition( |
4161 | const struct lttng_condition *condition, | |
4162 | uint64_t session_consumed_size) | |
4163 | { | |
4164 | uint64_t threshold; | |
4165 | const struct lttng_condition_session_consumed_size *size_condition = | |
4166 | container_of(condition, | |
4167 | struct lttng_condition_session_consumed_size, | |
4168 | parent); | |
4169 | ||
4170 | threshold = size_condition->consumed_threshold_bytes.value; | |
f91c3842 | 4171 | DBG("Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, |
e8360425 JD |
4172 | threshold, session_consumed_size); |
4173 | return session_consumed_size >= threshold; | |
4174 | } | |
4175 | ||
4176 | static | |
ed327204 | 4177 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 4178 | struct lttng_evaluation **evaluation, |
e8360425 JD |
4179 | const struct notification_thread_state *state, |
4180 | const struct channel_state_sample *previous_sample, | |
4181 | const struct channel_state_sample *latest_sample, | |
4182 | uint64_t previous_session_consumed_total, | |
4183 | uint64_t latest_session_consumed_total, | |
4184 | struct channel_info *channel_info) | |
ab0ee2ca JG |
4185 | { |
4186 | int ret = 0; | |
4187 | enum lttng_condition_type condition_type; | |
e8360425 JD |
4188 | const bool previous_sample_available = !!previous_sample; |
4189 | bool previous_sample_result = false; | |
ab0ee2ca JG |
4190 | bool latest_sample_result; |
4191 | ||
4192 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 4193 | |
e8360425 JD |
4194 | switch (condition_type) { |
4195 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4196 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
4197 | if (caa_likely(previous_sample_available)) { | |
4198 | previous_sample_result = | |
4199 | evaluate_buffer_usage_condition(condition, | |
4200 | previous_sample, channel_info->capacity); | |
4201 | } | |
4202 | latest_sample_result = evaluate_buffer_usage_condition( | |
4203 | condition, latest_sample, | |
4204 | channel_info->capacity); | |
4205 | break; | |
4206 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4207 | if (caa_likely(previous_sample_available)) { | |
4208 | previous_sample_result = | |
4209 | evaluate_session_consumed_size_condition( | |
4210 | condition, | |
4211 | previous_session_consumed_total); | |
4212 | } | |
4213 | latest_sample_result = | |
4214 | evaluate_session_consumed_size_condition( | |
4215 | condition, | |
4216 | latest_session_consumed_total); | |
4217 | break; | |
4218 | default: | |
4219 | /* Unknown condition type; internal error. */ | |
4220 | abort(); | |
4221 | } | |
ab0ee2ca JG |
4222 | |
4223 | if (!latest_sample_result || | |
4224 | (previous_sample_result == latest_sample_result)) { | |
4225 | /* | |
4226 | * Only trigger on a condition evaluation transition. | |
4227 | * | |
4228 | * NOTE: This edge-triggered logic may not be appropriate for | |
4229 | * future condition types. | |
4230 | */ | |
4231 | goto end; | |
4232 | } | |
4233 | ||
e8360425 JD |
4234 | if (!evaluation || !latest_sample_result) { |
4235 | goto end; | |
4236 | } | |
4237 | ||
4238 | switch (condition_type) { | |
4239 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4240 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
4241 | *evaluation = lttng_evaluation_buffer_usage_create( |
4242 | condition_type, | |
4243 | latest_sample->highest_usage, | |
e8360425 JD |
4244 | channel_info->capacity); |
4245 | break; | |
4246 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4247 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
4248 | latest_session_consumed_total); |
4249 | break; | |
4250 | default: | |
4251 | abort(); | |
4252 | } | |
4253 | ||
4254 | if (!*evaluation) { | |
4255 | ret = -1; | |
4256 | goto end; | |
ab0ee2ca JG |
4257 | } |
4258 | end: | |
4259 | return ret; | |
4260 | } | |
4261 | ||
4262 | static | |
f2b3ef9f | 4263 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4264 | { |
f2b3ef9f JG |
4265 | int ret = 0; |
4266 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 4267 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
4268 | }; |
4269 | ||
505b2d90 JG |
4270 | ASSERT_LOCKED(client->lock); |
4271 | ||
f2b3ef9f JG |
4272 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4273 | client->socket); | |
4274 | if (client->communication.outbound.dropped_notification) { | |
4275 | /* | |
4276 | * The client already has a "notification dropped" message | |
4277 | * in its outgoing queue. Nothing to do since all | |
4278 | * of those messages are coalesced. | |
4279 | */ | |
4280 | goto end; | |
4281 | } | |
4282 | ||
4283 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4284 | ret = lttng_dynamic_buffer_append( |
882093ee | 4285 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4286 | sizeof(msg)); |
f2b3ef9f JG |
4287 | if (ret) { |
4288 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4289 | client->socket); | |
4290 | } | |
4291 | end: | |
ab0ee2ca JG |
4292 | return ret; |
4293 | } | |
4294 | ||
f2b3ef9f JG |
4295 | static int client_handle_transmission_status_wrapper( |
4296 | struct notification_client *client, | |
4297 | enum client_transmission_status status, | |
4298 | void *user_data) | |
4299 | { | |
4300 | return client_handle_transmission_status(client, status, | |
4301 | (struct notification_thread_state *) user_data); | |
4302 | } | |
4303 | ||
4304 | static | |
4305 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4306 | const struct lttng_evaluation *evaluation, | |
4307 | struct notification_client_list* client_list, | |
4308 | struct notification_thread_state *state, | |
4309 | uid_t object_uid, gid_t object_gid) | |
4310 | { | |
ff588497 JR |
4311 | const struct lttng_credentials creds = { |
4312 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4313 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4314 | }; | |
4315 | ||
f2b3ef9f | 4316 | return notification_client_list_send_evaluation(client_list, |
52d55cf9 | 4317 | trigger, evaluation, |
ff588497 | 4318 | &creds, |
f2b3ef9f JG |
4319 | client_handle_transmission_status_wrapper, state); |
4320 | } | |
4321 | ||
f37d0f86 JG |
4322 | /* |
4323 | * Permission checks relative to notification channel clients are performed | |
4324 | * here. Notice how object, client, and trigger credentials are involved in | |
4325 | * this check. | |
4326 | * | |
4327 | * The `object` credentials are the credentials associated with the "subject" | |
4328 | * of a condition. For instance, a `rotation completed` condition applies | |
4329 | * to a session. When that condition is met, it will produce an evaluation | |
4330 | * against a session. Hence, in this case, the `object` credentials are the | |
4331 | * credentials of the "subject" session. | |
4332 | * | |
4333 | * The `trigger` credentials are the credentials of the user that registered the | |
4334 | * trigger. | |
4335 | * | |
4336 | * The `client` credentials are the credentials of the user that created a given | |
4337 | * notification channel. | |
4338 | * | |
4339 | * In terms of visibility, it is expected that non-privilieged users can only | |
4340 | * register triggers against "their" objects (their own sessions and | |
4341 | * applications they are allowed to interact with). They can then open a | |
4342 | * notification channel and subscribe to notifications associated with those | |
4343 | * triggers. | |
4344 | * | |
4345 | * As for privilieged users, they can register triggers against the objects of | |
4346 | * other users. They can then subscribe to the notifications associated to their | |
4347 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4348 | * triggers owned by other users; they must create their own triggers. | |
4349 | * | |
4350 | * This is more a concern of usability than security. It would be difficult for | |
4351 | * a root user reliably subscribe to a specific set of conditions without | |
4352 | * interference from external users (those could, for instance, unregister | |
4353 | * their triggers). | |
4354 | */ | |
f2b3ef9f JG |
4355 | LTTNG_HIDDEN |
4356 | int notification_client_list_send_evaluation( | |
4357 | struct notification_client_list *client_list, | |
52d55cf9 | 4358 | const struct lttng_trigger *trigger, |
9b63a4aa | 4359 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4360 | const struct lttng_credentials *source_object_creds, |
4361 | report_client_transmission_result_cb client_report, | |
4362 | void *user_data) | |
ab0ee2ca JG |
4363 | { |
4364 | int ret = 0; | |
c0a66c84 | 4365 | struct lttng_payload msg_payload; |
ab0ee2ca | 4366 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4367 | const struct lttng_notification notification = { |
52d55cf9 | 4368 | .trigger = (struct lttng_trigger *) trigger, |
9b63a4aa JG |
4369 | .evaluation = (struct lttng_evaluation *) evaluation, |
4370 | }; | |
3647288f JG |
4371 | struct lttng_notification_channel_message msg_header = { |
4372 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
4373 | }; | |
52d55cf9 JG |
4374 | const struct lttng_credentials *trigger_creds = |
4375 | lttng_trigger_get_credentials(trigger); | |
ab0ee2ca | 4376 | |
c0a66c84 | 4377 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4378 | |
c0a66c84 | 4379 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4380 | sizeof(msg_header)); |
ab0ee2ca JG |
4381 | if (ret) { |
4382 | goto end; | |
4383 | } | |
4384 | ||
c0a66c84 | 4385 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4386 | if (ret) { |
f91c3842 | 4387 | ERR("Failed to serialize notification"); |
ab0ee2ca JG |
4388 | ret = -1; |
4389 | goto end; | |
4390 | } | |
4391 | ||
3647288f | 4392 | /* Update payload size. */ |
505b2d90 JG |
4393 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4394 | ->size = (uint32_t)( | |
4395 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4396 | |
882093ee JR |
4397 | /* Update the payload number of fds. */ |
4398 | { | |
4399 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4400 | &msg_payload, 0, -1); | |
4401 | ||
4402 | ((struct lttng_notification_channel_message *) | |
4403 | msg_payload.buffer.data)->fds = (uint32_t) | |
4404 | lttng_payload_view_get_fd_handle_count(&pv); | |
4405 | } | |
4406 | ||
505b2d90 | 4407 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 4408 | cds_list_for_each_entry_safe(client_list_element, tmp, |
091fa780 | 4409 | &client_list->clients_list, node) { |
f2b3ef9f | 4410 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4411 | struct notification_client *client = |
4412 | client_list_element->client; | |
4413 | ||
505b2d90 JG |
4414 | ret = 0; |
4415 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4416 | if (!client->communication.active) { |
4417 | /* | |
4418 | * Skip inactive client (protocol error or | |
4419 | * disconnecting). | |
4420 | */ | |
4421 | DBG("Skipping client at it is marked as inactive"); | |
4422 | goto skip_client; | |
4423 | } | |
4424 | ||
5682b2e6 JG |
4425 | if (lttng_trigger_is_hidden(trigger) && !client->is_sessiond) { |
4426 | /* | |
4427 | * Notifications resulting from an hidden trigger are | |
4428 | * only sent to the session daemon. | |
4429 | */ | |
61883fe4 JG |
4430 | DBG("Skipping client as the trigger is hidden and the client is not the session daemon"); |
4431 | goto skip_client; | |
5682b2e6 JG |
4432 | } |
4433 | ||
f2b3ef9f | 4434 | if (source_object_creds) { |
ff588497 JR |
4435 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4436 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4437 | client->uid != 0) { |
4438 | /* | |
4439 | * Client is not allowed to monitor this | |
4440 | * object. | |
4441 | */ | |
f91c3842 | 4442 | DBG("Skipping client at it does not have the object permission to receive notification for this trigger"); |
6c24d3fd | 4443 | goto skip_client; |
f2b3ef9f | 4444 | } |
90843f49 JR |
4445 | } |
4446 | ||
f712e5f6 | 4447 | if (client->uid != lttng_credentials_get_uid(trigger_creds)) { |
f91c3842 | 4448 | DBG("Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4449 | goto skip_client; |
ab0ee2ca JG |
4450 | } |
4451 | ||
f91c3842 | 4452 | DBG("Sending notification to client (fd = %i, %zu bytes)", |
c0a66c84 | 4453 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4454 | |
4455 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4456 | /* |
4457 | * Outgoing data is already buffered for this client; | |
4458 | * drop the notification and enqueue a "dropped | |
4459 | * notification" message if this is the first dropped | |
4460 | * notification since the socket spilled-over to the | |
4461 | * queue. | |
4462 | */ | |
f2b3ef9f JG |
4463 | ret = client_notification_overflow(client); |
4464 | if (ret) { | |
6c24d3fd JG |
4465 | /* Fatal error. */ |
4466 | goto skip_client; | |
ab0ee2ca | 4467 | } |
ab0ee2ca JG |
4468 | } |
4469 | ||
882093ee | 4470 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4471 | if (ret) { |
6c24d3fd JG |
4472 | /* Fatal error. */ |
4473 | goto skip_client; | |
ab0ee2ca JG |
4474 | } |
4475 | ||
f2b3ef9f | 4476 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4477 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4478 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4479 | if (ret) { |
6c24d3fd JG |
4480 | /* Fatal error. */ |
4481 | goto end_unlock_list; | |
505b2d90 | 4482 | } |
6c24d3fd JG |
4483 | |
4484 | continue; | |
4485 | ||
4486 | skip_client: | |
505b2d90 JG |
4487 | pthread_mutex_unlock(&client->lock); |
4488 | if (ret) { | |
6c24d3fd | 4489 | /* Fatal error. */ |
505b2d90 | 4490 | goto end_unlock_list; |
ab0ee2ca JG |
4491 | } |
4492 | } | |
4493 | ret = 0; | |
505b2d90 JG |
4494 | |
4495 | end_unlock_list: | |
4496 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4497 | end: |
c0a66c84 | 4498 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4499 | return ret; |
4500 | } | |
4501 | ||
8b524060 FD |
4502 | static |
4503 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4504 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4505 | { |
4506 | int ret; | |
b9a8d78f FD |
4507 | uint64_t token; |
4508 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4509 | char *capture_buffer = NULL; |
4510 | size_t capture_buffer_size; | |
94078603 JR |
4511 | void *reception_buffer; |
4512 | size_t reception_size; | |
4513 | ||
fc4b93fa | 4514 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
2d6bae7e | 4515 | struct lttng_kernel_abi_event_notifier_notification kernel_notification; |
94078603 | 4516 | |
b9a8d78f | 4517 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4518 | switch(domain) { |
4519 | case LTTNG_DOMAIN_UST: | |
4520 | reception_buffer = (void *) &ust_notification; | |
4521 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4522 | break; |
4523 | case LTTNG_DOMAIN_KERNEL: | |
4524 | reception_buffer = (void *) &kernel_notification; | |
4525 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4526 | break; |
4527 | default: | |
4528 | abort(); | |
4529 | } | |
4530 | ||
4531 | /* | |
4532 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4533 | * ensuring that read/write of tracer notifications are atomic. | |
4534 | */ | |
4535 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4536 | reception_size); | |
4537 | if (ret != reception_size) { | |
4538 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4539 | notification_pipe_read_fd, reception_size, ret); | |
4540 | ret = -1; | |
4541 | goto end; | |
4542 | } | |
4543 | ||
4544 | switch(domain) { | |
4545 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4546 | token = ust_notification.token; |
82b3cbf4 | 4547 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4548 | break; |
4549 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4550 | token = kernel_notification.token; |
bbd6675c | 4551 | capture_buffer_size = kernel_notification.capture_buf_size; |
94078603 JR |
4552 | break; |
4553 | default: | |
4554 | abort(); | |
4555 | } | |
4556 | ||
82b3cbf4 JR |
4557 | if (capture_buffer_size == 0) { |
4558 | capture_buffer = NULL; | |
4559 | goto skip_capture; | |
4560 | } | |
4561 | ||
4562 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
f91c3842 | 4563 | ERR("Event notifier has a capture payload size which exceeds the maximum allowed size: capture_payload_size = %zu bytes, max allowed size = %d bytes", |
82b3cbf4 JR |
4564 | capture_buffer_size, MAX_CAPTURE_SIZE); |
4565 | goto end; | |
4566 | } | |
4567 | ||
4568 | capture_buffer = zmalloc(capture_buffer_size); | |
4569 | if (!capture_buffer) { | |
f91c3842 | 4570 | ERR("Failed to allocate capture buffer"); |
82b3cbf4 JR |
4571 | goto end; |
4572 | } | |
4573 | ||
4574 | /* Fetch additional payload (capture). */ | |
4575 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4576 | if (ret != capture_buffer_size) { | |
f91c3842 | 4577 | ERR("Failed to read from event source pipe (fd = %i)", |
82b3cbf4 JR |
4578 | notification_pipe_read_fd); |
4579 | goto end; | |
4580 | } | |
4581 | ||
4582 | skip_capture: | |
4583 | notification = lttng_event_notifier_notification_create(token, domain, | |
4584 | capture_buffer, capture_buffer_size); | |
4585 | if (notification == NULL) { | |
4586 | goto end; | |
4587 | } | |
4588 | ||
4589 | /* | |
4590 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4591 | */ | |
4592 | capture_buffer = NULL; | |
4593 | ||
b9a8d78f | 4594 | end: |
82b3cbf4 | 4595 | free(capture_buffer); |
b9a8d78f FD |
4596 | return notification; |
4597 | } | |
4598 | ||
8b524060 FD |
4599 | static |
4600 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4601 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4602 | { |
b9a8d78f FD |
4603 | struct cds_lfht_node *node; |
4604 | struct cds_lfht_iter iter; | |
4605 | struct notification_trigger_tokens_ht_element *element; | |
4606 | struct lttng_evaluation *evaluation = NULL; | |
b9a8d78f FD |
4607 | enum action_executor_status executor_status; |
4608 | struct notification_client_list *client_list = NULL; | |
8b524060 | 4609 | int ret; |
7c920b63 | 4610 | unsigned int capture_count = 0; |
b9a8d78f | 4611 | |
94078603 JR |
4612 | /* Find triggers associated with this token. */ |
4613 | rcu_read_lock(); | |
4614 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4615 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4616 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4617 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4618 | if (caa_unlikely(!node)) { |
94078603 | 4619 | /* |
f1446131 JR |
4620 | * This is not an error, slow consumption of the tracer |
4621 | * notifications can lead to situations where a trigger is | |
4622 | * removed but we still get tracer notifications matching a | |
4623 | * trigger that no longer exists. | |
94078603 JR |
4624 | */ |
4625 | ret = 0; | |
4626 | goto end_unlock; | |
4627 | } | |
4628 | ||
4629 | element = caa_container_of(node, | |
4630 | struct notification_trigger_tokens_ht_element, | |
4631 | node); | |
4632 | ||
8dbb86b8 | 4633 | if (lttng_condition_event_rule_matches_get_capture_descriptor_count( |
7c920b63 PP |
4634 | lttng_trigger_get_const_condition(element->trigger), |
4635 | &capture_count) != LTTNG_CONDITION_STATUS_OK) { | |
4636 | ERR("Failed to get capture count"); | |
4637 | ret = -1; | |
4638 | goto end; | |
4639 | } | |
4640 | ||
4641 | if (!notification->capture_buffer && capture_count != 0) { | |
4642 | ERR("Expected capture but capture buffer is null"); | |
4643 | ret = -1; | |
4644 | goto end; | |
4645 | } | |
4646 | ||
8dbb86b8 | 4647 | evaluation = lttng_evaluation_event_rule_matches_create( |
7c920b63 PP |
4648 | container_of(lttng_trigger_get_const_condition( |
4649 | element->trigger), | |
8dbb86b8 | 4650 | struct lttng_condition_event_rule_matches, |
7c920b63 | 4651 | parent), |
7c920b63 PP |
4652 | notification->capture_buffer, |
4653 | notification->capture_buf_size, false); | |
4654 | ||
f1446131 | 4655 | if (evaluation == NULL) { |
e1e94513 | 4656 | ERR("Failed to create event rule matches evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4657 | ret = -1; |
4658 | goto end_unlock; | |
4659 | } | |
e1e94513 | 4660 | |
f1446131 JR |
4661 | client_list = get_client_list_from_condition(state, |
4662 | lttng_trigger_get_const_condition(element->trigger)); | |
72365501 | 4663 | executor_status = action_executor_enqueue_trigger(state->executor, |
f1446131 JR |
4664 | element->trigger, evaluation, NULL, client_list); |
4665 | switch (executor_status) { | |
4666 | case ACTION_EXECUTOR_STATUS_OK: | |
4667 | ret = 0; | |
4668 | break; | |
4669 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4670 | { | |
4671 | struct notification_client_list_element *client_list_element, | |
4672 | *tmp; | |
4673 | ||
4674 | /* | |
4675 | * Not a fatal error; this is expected and simply means the | |
4676 | * executor has too much work queued already. | |
4677 | */ | |
4678 | ret = 0; | |
4679 | ||
4680 | /* No clients subscribed to notifications for this trigger. */ | |
4681 | if (!client_list) { | |
4682 | break; | |
4683 | } | |
4684 | ||
4685 | /* Warn clients that a notification (or more) was dropped. */ | |
4686 | pthread_mutex_lock(&client_list->lock); | |
4687 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 4688 | &client_list->clients_list, node) { |
f1446131 JR |
4689 | enum client_transmission_status transmission_status; |
4690 | struct notification_client *client = | |
4691 | client_list_element->client; | |
4692 | ||
4693 | pthread_mutex_lock(&client->lock); | |
4694 | ret = client_notification_overflow(client); | |
4695 | if (ret) { | |
4696 | /* Fatal error. */ | |
4697 | goto next_client; | |
4698 | } | |
4699 | ||
4700 | transmission_status = | |
4701 | client_flush_outgoing_queue(client); | |
4702 | ret = client_handle_transmission_status( | |
4703 | client, transmission_status, state); | |
4704 | if (ret) { | |
4705 | /* Fatal error. */ | |
4706 | goto next_client; | |
4707 | } | |
4708 | next_client: | |
4709 | pthread_mutex_unlock(&client->lock); | |
4710 | if (ret) { | |
4711 | break; | |
4712 | } | |
4713 | } | |
4714 | ||
4715 | pthread_mutex_unlock(&client_list->lock); | |
4716 | break; | |
4717 | } | |
98dfca79 | 4718 | case ACTION_EXECUTOR_STATUS_INVALID: |
f1446131 JR |
4719 | case ACTION_EXECUTOR_STATUS_ERROR: |
4720 | /* Fatal error, shut down everything. */ | |
4721 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4722 | ret = -1; | |
4723 | goto end_unlock; | |
4724 | default: | |
4725 | /* Unhandled error. */ | |
4726 | abort(); | |
4727 | } | |
94078603 JR |
4728 | |
4729 | end_unlock: | |
f1446131 | 4730 | notification_client_list_put(client_list); |
94078603 | 4731 | rcu_read_unlock(); |
7c920b63 | 4732 | end: |
8b524060 FD |
4733 | return ret; |
4734 | } | |
4735 | ||
4736 | static | |
4737 | int handle_one_event_notifier_notification( | |
4738 | struct notification_thread_state *state, | |
4739 | int pipe, enum lttng_domain_type domain) | |
4740 | { | |
82b3cbf4 | 4741 | int ret = 0; |
8b524060 FD |
4742 | struct lttng_event_notifier_notification *notification = NULL; |
4743 | ||
4744 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4745 | if (notification == NULL) { | |
82b3cbf4 | 4746 | /* Reception failed, don't consider it fatal. */ |
f91c3842 | 4747 | ERR("Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 | 4748 | pipe, lttng_domain_type_str(domain)); |
8b524060 FD |
4749 | goto end; |
4750 | } | |
4751 | ||
4752 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4753 | if (ret) { | |
f91c3842 | 4754 | ERR("Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 FD |
4755 | pipe, lttng_domain_type_str(domain)); |
4756 | goto end; | |
4757 | } | |
4758 | ||
94078603 | 4759 | end: |
8b524060 | 4760 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4761 | return ret; |
4762 | } | |
4763 | ||
8b524060 FD |
4764 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4765 | int pipe, enum lttng_domain_type domain) | |
4766 | { | |
4767 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4768 | } | |
4769 | ||
ab0ee2ca JG |
4770 | int handle_notification_thread_channel_sample( |
4771 | struct notification_thread_state *state, int pipe, | |
4772 | enum lttng_domain_type domain) | |
4773 | { | |
4774 | int ret = 0; | |
4775 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4776 | struct channel_info *channel_info; |
4777 | struct cds_lfht_node *node; | |
4778 | struct cds_lfht_iter iter; | |
4779 | struct lttng_channel_trigger_list *trigger_list; | |
4780 | struct lttng_trigger_list_element *trigger_list_element; | |
4781 | bool previous_sample_available = false; | |
e8360425 JD |
4782 | struct channel_state_sample previous_sample, latest_sample; |
4783 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4784 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4785 | |
4786 | /* | |
4787 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4788 | * ensuring that read/write of sampling messages are atomic. | |
4789 | */ | |
7c2551ef | 4790 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca | 4791 | if (ret != sizeof(sample_msg)) { |
f91c3842 | 4792 | ERR("Failed to read from monitoring pipe (fd = %i)", |
ab0ee2ca JG |
4793 | pipe); |
4794 | ret = -1; | |
4795 | goto end; | |
4796 | } | |
4797 | ||
4798 | ret = 0; | |
4799 | latest_sample.key.key = sample_msg.key; | |
4800 | latest_sample.key.domain = domain; | |
4801 | latest_sample.highest_usage = sample_msg.highest; | |
4802 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4803 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4804 | |
4805 | rcu_read_lock(); | |
4806 | ||
4807 | /* Retrieve the channel's informations */ | |
4808 | cds_lfht_lookup(state->channels_ht, | |
4809 | hash_channel_key(&latest_sample.key), | |
4810 | match_channel_info, | |
4811 | &latest_sample.key, | |
4812 | &iter); | |
4813 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4814 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4815 | /* |
4816 | * Not an error since the consumer can push a sample to the pipe | |
4817 | * and the rest of the session daemon could notify us of the | |
4818 | * channel's destruction before we get a chance to process that | |
4819 | * sample. | |
4820 | */ | |
f91c3842 | 4821 | DBG("Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", |
ab0ee2ca | 4822 | latest_sample.key.key, |
526200e4 | 4823 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4824 | goto end_unlock; |
4825 | } | |
4826 | channel_info = caa_container_of(node, struct channel_info, | |
4827 | channels_ht_node); | |
f91c3842 | 4828 | DBG("Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4829 | channel_info->name, |
ab0ee2ca | 4830 | latest_sample.key.key, |
8abe313a | 4831 | channel_info->session_info->name, |
ab0ee2ca | 4832 | latest_sample.highest_usage, |
e8360425 JD |
4833 | latest_sample.lowest_usage, |
4834 | latest_sample.channel_total_consumed); | |
4835 | ||
4836 | previous_session_consumed_total = | |
4837 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4838 | |
4839 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4840 | cds_lfht_lookup(state->channel_state_ht, | |
4841 | hash_channel_key(&latest_sample.key), | |
4842 | match_channel_state_sample, | |
4843 | &latest_sample.key, | |
4844 | &iter); | |
4845 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4846 | if (caa_likely(node)) { |
ab0ee2ca JG |
4847 | struct channel_state_sample *stored_sample; |
4848 | ||
4849 | /* Update the sample stored. */ | |
4850 | stored_sample = caa_container_of(node, | |
4851 | struct channel_state_sample, | |
4852 | channel_state_ht_node); | |
e8360425 | 4853 | |
ab0ee2ca JG |
4854 | memcpy(&previous_sample, stored_sample, |
4855 | sizeof(previous_sample)); | |
4856 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4857 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4858 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4859 | previous_sample_available = true; |
e8360425 JD |
4860 | |
4861 | latest_session_consumed_total = | |
4862 | previous_session_consumed_total + | |
4863 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4864 | } else { |
4865 | /* | |
4866 | * This is the channel's first sample, allocate space for and | |
4867 | * store the new sample. | |
4868 | */ | |
4869 | struct channel_state_sample *stored_sample; | |
4870 | ||
4871 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4872 | if (!stored_sample) { | |
4873 | ret = -1; | |
4874 | goto end_unlock; | |
4875 | } | |
4876 | ||
4877 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4878 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4879 | cds_lfht_add(state->channel_state_ht, | |
4880 | hash_channel_key(&stored_sample->key), | |
4881 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4882 | |
4883 | latest_session_consumed_total = | |
4884 | previous_session_consumed_total + | |
4885 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4886 | } |
4887 | ||
e8360425 JD |
4888 | channel_info->session_info->consumed_data_size = |
4889 | latest_session_consumed_total; | |
4890 | ||
ab0ee2ca JG |
4891 | /* Find triggers associated with this channel. */ |
4892 | cds_lfht_lookup(state->channel_triggers_ht, | |
4893 | hash_channel_key(&latest_sample.key), | |
4894 | match_channel_trigger_list, | |
4895 | &latest_sample.key, | |
4896 | &iter); | |
4897 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4898 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4899 | goto end_unlock; |
4900 | } | |
4901 | ||
f2b3ef9f | 4902 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4903 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4904 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4905 | }; |
4906 | ||
ab0ee2ca JG |
4907 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4908 | channel_triggers_ht_node); | |
4909 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4910 | node) { |
9b63a4aa | 4911 | const struct lttng_condition *condition; |
f2b3ef9f | 4912 | struct lttng_trigger *trigger; |
505b2d90 | 4913 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4914 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4915 | enum action_executor_status executor_status; |
ab0ee2ca | 4916 | |
505b2d90 | 4917 | ret = 0; |
ab0ee2ca | 4918 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4919 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 4920 | assert(condition); |
ab0ee2ca JG |
4921 | |
4922 | /* | |
4923 | * Check if any client is subscribed to the result of this | |
4924 | * evaluation. | |
4925 | */ | |
ed327204 | 4926 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4927 | |
ed327204 | 4928 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4929 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4930 | &latest_sample, |
4931 | previous_session_consumed_total, | |
4932 | latest_session_consumed_total, | |
4933 | channel_info); | |
4934 | if (caa_unlikely(ret)) { | |
505b2d90 | 4935 | goto put_list; |
ab0ee2ca JG |
4936 | } |
4937 | ||
e8360425 | 4938 | if (caa_likely(!evaluation)) { |
505b2d90 | 4939 | goto put_list; |
ab0ee2ca JG |
4940 | } |
4941 | ||
f2b3ef9f JG |
4942 | /* |
4943 | * Ownership of `evaluation` transferred to the action executor | |
4944 | * no matter the result. | |
4945 | */ | |
72365501 JR |
4946 | executor_status = action_executor_enqueue_trigger( |
4947 | state->executor, trigger, evaluation, | |
4948 | &channel_creds, client_list); | |
f2b3ef9f JG |
4949 | evaluation = NULL; |
4950 | switch (executor_status) { | |
4951 | case ACTION_EXECUTOR_STATUS_OK: | |
4952 | break; | |
4953 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4954 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4955 | /* | |
4956 | * TODO Add trigger identification (name/id) when | |
4957 | * it is added to the API. | |
4958 | */ | |
4959 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4960 | ret = -1; | |
4961 | goto put_list; | |
4962 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4963 | /* | |
4964 | * TODO Add trigger identification (name/id) when | |
4965 | * it is added to the API. | |
4966 | * | |
4967 | * Not a fatal error. | |
4968 | */ | |
4969 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4970 | ret = 0; | |
4971 | goto put_list; | |
4972 | default: | |
4973 | abort(); | |
4974 | } | |
4975 | ||
505b2d90 JG |
4976 | put_list: |
4977 | notification_client_list_put(client_list); | |
e0b5f87b | 4978 | if (caa_unlikely(ret)) { |
505b2d90 | 4979 | break; |
ab0ee2ca JG |
4980 | } |
4981 | } | |
4982 | end_unlock: | |
4983 | rcu_read_unlock(); | |
4984 | end: | |
4985 | return ret; | |
4986 | } |