Commit | Line | Data |
---|---|---|
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> |
ab0ee2ca JG |
24 | #include <lttng/notification/notification-internal.h> |
25 | #include <lttng/condition/condition-internal.h> | |
26 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 27 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 28 | #include <lttng/condition/session-rotation-internal.h> |
959e3c66 | 29 | #include <lttng/condition/event-rule-internal.h> |
d02d7404 | 30 | #include <lttng/domain-internal.h> |
ab0ee2ca | 31 | #include <lttng/notification/channel-internal.h> |
85c06c44 | 32 | #include <lttng/trigger/trigger-internal.h> |
959e3c66 | 33 | #include <lttng/event-rule/event-rule-internal.h> |
1da26331 | 34 | |
ab0ee2ca JG |
35 | #include <time.h> |
36 | #include <unistd.h> | |
37 | #include <assert.h> | |
38 | #include <inttypes.h> | |
d53ea4e4 | 39 | #include <fcntl.h> |
ab0ee2ca | 40 | |
e98a976a | 41 | #include "condition-internal.h" |
1da26331 JG |
42 | #include "notification-thread.h" |
43 | #include "notification-thread-events.h" | |
44 | #include "notification-thread-commands.h" | |
45 | #include "lttng-sessiond.h" | |
46 | #include "kernel.h" | |
47 | ||
ab0ee2ca JG |
48 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
49 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
50 | ||
82b3cbf4 JR |
51 | /* The tracers currently limit the capture size to PIPE_BUF (4kb on linux). */ |
52 | #define MAX_CAPTURE_SIZE (PIPE_BUF) | |
53 | ||
51eab943 JG |
54 | enum lttng_object_type { |
55 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
56 | LTTNG_OBJECT_TYPE_NONE, | |
57 | LTTNG_OBJECT_TYPE_CHANNEL, | |
58 | LTTNG_OBJECT_TYPE_SESSION, | |
59 | }; | |
60 | ||
ab0ee2ca | 61 | struct lttng_trigger_list_element { |
9e0bb80e | 62 | /* No ownership of the trigger object is assumed. */ |
f2b3ef9f | 63 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
64 | struct cds_list_head node; |
65 | }; | |
66 | ||
67 | struct lttng_channel_trigger_list { | |
68 | struct channel_key channel_key; | |
ea9a44f0 | 69 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 70 | struct cds_list_head list; |
ea9a44f0 | 71 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 72 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
73 | /* call_rcu delayed reclaim. */ |
74 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
75 | }; |
76 | ||
ea9a44f0 JG |
77 | /* |
78 | * List of triggers applying to a given session. | |
79 | * | |
80 | * See: | |
81 | * - lttng_session_trigger_list_create() | |
82 | * - lttng_session_trigger_list_build() | |
83 | * - lttng_session_trigger_list_destroy() | |
84 | * - lttng_session_trigger_list_add() | |
85 | */ | |
86 | struct lttng_session_trigger_list { | |
87 | /* | |
88 | * Not owned by this; points to the session_info structure's | |
89 | * session name. | |
90 | */ | |
91 | const char *session_name; | |
92 | /* List of struct lttng_trigger_list_element. */ | |
93 | struct cds_list_head list; | |
94 | /* Node in the session_triggers_ht */ | |
95 | struct cds_lfht_node session_triggers_ht_node; | |
96 | /* | |
97 | * Weak reference to the notification system's session triggers | |
98 | * hashtable. | |
99 | * | |
100 | * The session trigger list structure structure is owned by | |
101 | * the session's session_info. | |
102 | * | |
103 | * The session_info is kept alive the the channel_infos holding a | |
104 | * reference to it (reference counting). When those channels are | |
105 | * destroyed (at runtime or on teardown), the reference they hold | |
106 | * to the session_info are released. On destruction of session_info, | |
107 | * session_info_destroy() will remove the list of triggers applying | |
108 | * to this session from the notification system's state. | |
109 | * | |
110 | * This implies that the session_triggers_ht must be destroyed | |
111 | * after the channels. | |
112 | */ | |
113 | struct cds_lfht *session_triggers_ht; | |
114 | /* Used for delayed RCU reclaim. */ | |
115 | struct rcu_head rcu_node; | |
116 | }; | |
117 | ||
ab0ee2ca JG |
118 | struct lttng_trigger_ht_element { |
119 | struct lttng_trigger *trigger; | |
120 | struct cds_lfht_node node; | |
242388e4 | 121 | struct cds_lfht_node node_by_name_uid; |
83b934ad MD |
122 | /* call_rcu delayed reclaim. */ |
123 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
124 | }; |
125 | ||
126 | struct lttng_condition_list_element { | |
127 | struct lttng_condition *condition; | |
128 | struct cds_list_head node; | |
129 | }; | |
130 | ||
ab0ee2ca JG |
131 | struct channel_state_sample { |
132 | struct channel_key key; | |
133 | struct cds_lfht_node channel_state_ht_node; | |
134 | uint64_t highest_usage; | |
135 | uint64_t lowest_usage; | |
e8360425 | 136 | uint64_t channel_total_consumed; |
83b934ad MD |
137 | /* call_rcu delayed reclaim. */ |
138 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
139 | }; |
140 | ||
e4db5ace | 141 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 142 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 143 | struct lttng_evaluation **evaluation, |
e8360425 JD |
144 | const struct notification_thread_state *state, |
145 | const struct channel_state_sample *previous_sample, | |
146 | const struct channel_state_sample *latest_sample, | |
147 | uint64_t previous_session_consumed_total, | |
148 | uint64_t latest_session_consumed_total, | |
149 | struct channel_info *channel_info); | |
e4db5ace | 150 | static |
9b63a4aa JG |
151 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
152 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
153 | struct notification_client_list *client_list, |
154 | struct notification_thread_state *state, | |
155 | uid_t channel_uid, gid_t channel_gid); | |
156 | ||
8abe313a | 157 | |
ea9a44f0 | 158 | /* session_info API */ |
8abe313a JG |
159 | static |
160 | void session_info_destroy(void *_data); | |
161 | static | |
162 | void session_info_get(struct session_info *session_info); | |
163 | static | |
164 | void session_info_put(struct session_info *session_info); | |
165 | static | |
166 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 167 | uid_t uid, gid_t gid, |
1eee26c5 JG |
168 | struct lttng_session_trigger_list *trigger_list, |
169 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
170 | static |
171 | void session_info_add_channel(struct session_info *session_info, | |
172 | struct channel_info *channel_info); | |
173 | static | |
174 | void session_info_remove_channel(struct session_info *session_info, | |
175 | struct channel_info *channel_info); | |
176 | ||
ea9a44f0 JG |
177 | /* lttng_session_trigger_list API */ |
178 | static | |
179 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
180 | const char *session_name, | |
181 | struct cds_lfht *session_triggers_ht); | |
182 | static | |
183 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
184 | const struct notification_thread_state *state, | |
185 | const char *session_name); | |
186 | static | |
187 | void lttng_session_trigger_list_destroy( | |
188 | struct lttng_session_trigger_list *list); | |
189 | static | |
190 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 191 | struct lttng_trigger *trigger); |
ea9a44f0 | 192 | |
f2b3ef9f JG |
193 | static |
194 | int client_handle_transmission_status( | |
195 | struct notification_client *client, | |
196 | enum client_transmission_status transmission_status, | |
197 | struct notification_thread_state *state); | |
ea9a44f0 | 198 | |
8b524060 FD |
199 | static |
200 | int handle_one_event_notifier_notification( | |
201 | struct notification_thread_state *state, | |
202 | int pipe, enum lttng_domain_type domain); | |
203 | ||
242388e4 JR |
204 | static |
205 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node); | |
206 | ||
ab0ee2ca | 207 | static |
ac1889bf | 208 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
209 | { |
210 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
211 | const int socket = (int) (intptr_t) key; |
212 | const struct notification_client *client = caa_container_of(node, | |
213 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 214 | |
ac1889bf JG |
215 | return client->socket == socket; |
216 | } | |
217 | ||
218 | static | |
219 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
220 | { | |
221 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
222 | const notification_client_id id = *((notification_client_id *) key); | |
223 | const struct notification_client *client = caa_container_of( | |
224 | node, struct notification_client, client_id_ht_node); | |
ab0ee2ca | 225 | |
ac1889bf | 226 | return client->id == id; |
ab0ee2ca JG |
227 | } |
228 | ||
229 | static | |
230 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
231 | { | |
232 | struct channel_key *channel_key = (struct channel_key *) key; | |
233 | struct lttng_channel_trigger_list *trigger_list; | |
234 | ||
235 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
236 | channel_triggers_ht_node); | |
237 | ||
238 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
239 | (channel_key->domain == trigger_list->channel_key.domain)); | |
240 | } | |
241 | ||
51eab943 JG |
242 | static |
243 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
244 | { | |
245 | const char *session_name = (const char *) key; | |
246 | struct lttng_session_trigger_list *trigger_list; | |
247 | ||
248 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
249 | session_triggers_ht_node); | |
250 | ||
251 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
252 | } | |
253 | ||
ab0ee2ca JG |
254 | static |
255 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
256 | { | |
257 | struct channel_key *channel_key = (struct channel_key *) key; | |
258 | struct channel_state_sample *sample; | |
259 | ||
260 | sample = caa_container_of(node, struct channel_state_sample, | |
261 | channel_state_ht_node); | |
262 | ||
263 | return !!((channel_key->key == sample->key.key) && | |
264 | (channel_key->domain == sample->key.domain)); | |
265 | } | |
266 | ||
267 | static | |
268 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
269 | { | |
270 | struct channel_key *channel_key = (struct channel_key *) key; | |
271 | struct channel_info *channel_info; | |
272 | ||
273 | channel_info = caa_container_of(node, struct channel_info, | |
274 | channels_ht_node); | |
275 | ||
276 | return !!((channel_key->key == channel_info->key.key) && | |
277 | (channel_key->domain == channel_info->key.domain)); | |
278 | } | |
279 | ||
280 | static | |
242388e4 | 281 | int match_trigger(struct cds_lfht_node *node, const void *key) |
ab0ee2ca | 282 | { |
242388e4 JR |
283 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; |
284 | struct lttng_trigger_ht_element *trigger_ht_element; | |
ab0ee2ca | 285 | |
242388e4 | 286 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, |
ab0ee2ca | 287 | node); |
ab0ee2ca | 288 | |
242388e4 | 289 | return !!lttng_trigger_is_equal(trigger_key, trigger_ht_element->trigger); |
ab0ee2ca JG |
290 | } |
291 | ||
e7c93cf9 JR |
292 | static |
293 | int match_trigger_token(struct cds_lfht_node *node, const void *key) | |
294 | { | |
295 | const uint64_t *_key = key; | |
296 | struct notification_trigger_tokens_ht_element *element; | |
297 | ||
298 | element = caa_container_of(node, | |
299 | struct notification_trigger_tokens_ht_element, node); | |
300 | return *_key == element->token; | |
301 | } | |
302 | ||
ab0ee2ca JG |
303 | static |
304 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
305 | { | |
306 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
307 | struct notification_client_list *client_list; | |
f82f93a1 | 308 | const struct lttng_condition *condition; |
ab0ee2ca JG |
309 | |
310 | assert(condition_key); | |
311 | ||
312 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 313 | notification_trigger_clients_ht_node); |
f82f93a1 | 314 | condition = lttng_trigger_get_const_condition(client_list->trigger); |
ab0ee2ca JG |
315 | |
316 | return !!lttng_condition_is_equal(condition_key, condition); | |
317 | } | |
318 | ||
f82f93a1 JG |
319 | static |
320 | int match_session(struct cds_lfht_node *node, const void *key) | |
321 | { | |
322 | const char *name = key; | |
323 | struct session_info *session_info = caa_container_of( | |
324 | node, struct session_info, sessions_ht_node); | |
325 | ||
326 | return !strcmp(session_info->name, name); | |
327 | } | |
328 | ||
6900ae81 FD |
329 | static |
330 | const char *notification_command_type_str( | |
331 | enum notification_thread_command_type type) | |
332 | { | |
333 | switch (type) { | |
334 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
335 | return "REGISTER_TRIGGER"; | |
336 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
337 | return "UNREGISTER_TRIGGER"; | |
338 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
339 | return "ADD_CHANNEL"; | |
340 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
341 | return "REMOVE_CHANNEL"; | |
342 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: | |
343 | return "SESSION_ROTATION_ONGOING"; | |
344 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: | |
345 | return "SESSION_ROTATION_COMPLETED"; | |
346 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: | |
347 | return "ADD_TRACER_EVENT_SOURCE"; | |
348 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
349 | return "REMOVE_TRACER_EVENT_SOURCE"; | |
350 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: | |
351 | return "LIST_TRIGGERS"; | |
352 | case NOTIFICATION_COMMAND_TYPE_QUIT: | |
353 | return "QUIT"; | |
354 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: | |
355 | return "CLIENT_COMMUNICATION_UPDATE"; | |
356 | default: | |
357 | abort(); | |
358 | } | |
359 | } | |
360 | ||
242388e4 JR |
361 | /* |
362 | * Match trigger based on name and credentials only. | |
363 | * Name duplication is NOT allowed for the same uid. | |
364 | */ | |
365 | static | |
366 | int match_trigger_by_name_uid(struct cds_lfht_node *node, | |
367 | const void *key) | |
368 | { | |
369 | bool match = false; | |
370 | const char *name; | |
371 | const char *key_name; | |
372 | enum lttng_trigger_status status; | |
373 | const struct lttng_credentials *key_creds; | |
374 | const struct lttng_credentials *node_creds; | |
375 | const struct lttng_trigger *trigger_key = | |
376 | (const struct lttng_trigger *) key; | |
377 | const struct lttng_trigger_ht_element *trigger_ht_element = | |
378 | caa_container_of(node, | |
379 | struct lttng_trigger_ht_element, | |
380 | node_by_name_uid); | |
381 | ||
382 | status = lttng_trigger_get_name(trigger_ht_element->trigger, &name); | |
383 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
384 | ||
385 | status = lttng_trigger_get_name(trigger_key, &key_name); | |
386 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
387 | ||
388 | /* Compare the names. */ | |
389 | if (strcmp(name, key_name) != 0) { | |
390 | goto end; | |
391 | } | |
392 | ||
393 | /* Compare the owners' UIDs. */ | |
394 | key_creds = lttng_trigger_get_credentials(trigger_key); | |
395 | node_creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
396 | ||
397 | match = lttng_credentials_is_equal_uid(key_creds, node_creds); | |
398 | ||
399 | end: | |
400 | return match; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Hash trigger based on name and credentials only. | |
405 | */ | |
406 | static | |
407 | unsigned long hash_trigger_by_name_uid(const struct lttng_trigger *trigger) | |
408 | { | |
409 | unsigned long hash = 0; | |
410 | const struct lttng_credentials *trigger_creds; | |
411 | const char *trigger_name; | |
412 | enum lttng_trigger_status status; | |
413 | ||
414 | status = lttng_trigger_get_name(trigger, &trigger_name); | |
415 | if (status == LTTNG_TRIGGER_STATUS_OK) { | |
416 | hash = hash_key_str(trigger_name, lttng_ht_seed); | |
417 | } | |
418 | ||
419 | trigger_creds = lttng_trigger_get_credentials(trigger); | |
420 | hash ^= hash_key_ulong((void *) (unsigned long) LTTNG_OPTIONAL_GET(trigger_creds->uid), | |
421 | lttng_ht_seed); | |
422 | ||
423 | return hash; | |
424 | } | |
425 | ||
e4db5ace JR |
426 | static |
427 | unsigned long hash_channel_key(struct channel_key *key) | |
428 | { | |
429 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
430 | unsigned long domain_hash = hash_key_ulong( | |
431 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
432 | ||
433 | return key_hash ^ domain_hash; | |
434 | } | |
435 | ||
ac1889bf JG |
436 | static |
437 | unsigned long hash_client_socket(int socket) | |
438 | { | |
439 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
440 | } | |
441 | ||
442 | static | |
443 | unsigned long hash_client_id(notification_client_id id) | |
444 | { | |
445 | return hash_key_u64(&id, lttng_ht_seed); | |
446 | } | |
447 | ||
f82f93a1 JG |
448 | /* |
449 | * Get the type of object to which a given condition applies. Bindings let | |
450 | * the notification system evaluate a trigger's condition when a given | |
451 | * object's state is updated. | |
452 | * | |
453 | * For instance, a condition bound to a channel will be evaluated everytime | |
454 | * the channel's state is changed by a channel monitoring sample. | |
455 | */ | |
456 | static | |
457 | enum lttng_object_type get_condition_binding_object( | |
458 | const struct lttng_condition *condition) | |
459 | { | |
460 | switch (lttng_condition_get_type(condition)) { | |
461 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
462 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
463 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 464 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
465 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
466 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
467 | return LTTNG_OBJECT_TYPE_SESSION; | |
959e3c66 JR |
468 | case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT: |
469 | return LTTNG_OBJECT_TYPE_NONE; | |
f82f93a1 JG |
470 | default: |
471 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
472 | } | |
473 | } | |
474 | ||
83b934ad MD |
475 | static |
476 | void free_channel_info_rcu(struct rcu_head *node) | |
477 | { | |
478 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
479 | } | |
480 | ||
ab0ee2ca JG |
481 | static |
482 | void channel_info_destroy(struct channel_info *channel_info) | |
483 | { | |
484 | if (!channel_info) { | |
485 | return; | |
486 | } | |
487 | ||
8abe313a JG |
488 | if (channel_info->session_info) { |
489 | session_info_remove_channel(channel_info->session_info, | |
490 | channel_info); | |
491 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 492 | } |
8abe313a JG |
493 | if (channel_info->name) { |
494 | free(channel_info->name); | |
ab0ee2ca | 495 | } |
83b934ad MD |
496 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
497 | } | |
498 | ||
499 | static | |
500 | void free_session_info_rcu(struct rcu_head *node) | |
501 | { | |
502 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
503 | } |
504 | ||
8abe313a | 505 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 506 | static |
8abe313a | 507 | void session_info_destroy(void *_data) |
ab0ee2ca | 508 | { |
8abe313a | 509 | struct session_info *session_info = _data; |
3b68d0a3 | 510 | int ret; |
ab0ee2ca | 511 | |
8abe313a JG |
512 | assert(session_info); |
513 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
514 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
515 | if (ret) { | |
4c3f302b | 516 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 517 | } |
8abe313a | 518 | } |
ea9a44f0 | 519 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
520 | |
521 | rcu_read_lock(); | |
522 | cds_lfht_del(session_info->sessions_ht, | |
523 | &session_info->sessions_ht_node); | |
524 | rcu_read_unlock(); | |
8abe313a | 525 | free(session_info->name); |
83b934ad | 526 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 527 | } |
ab0ee2ca | 528 | |
8abe313a JG |
529 | static |
530 | void session_info_get(struct session_info *session_info) | |
531 | { | |
532 | if (!session_info) { | |
533 | return; | |
534 | } | |
535 | lttng_ref_get(&session_info->ref); | |
536 | } | |
537 | ||
538 | static | |
539 | void session_info_put(struct session_info *session_info) | |
540 | { | |
541 | if (!session_info) { | |
542 | return; | |
ab0ee2ca | 543 | } |
8abe313a JG |
544 | lttng_ref_put(&session_info->ref); |
545 | } | |
546 | ||
547 | static | |
ea9a44f0 | 548 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
549 | struct lttng_session_trigger_list *trigger_list, |
550 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
551 | { |
552 | struct session_info *session_info; | |
ab0ee2ca | 553 | |
8abe313a | 554 | assert(name); |
ab0ee2ca | 555 | |
8abe313a JG |
556 | session_info = zmalloc(sizeof(*session_info)); |
557 | if (!session_info) { | |
558 | goto end; | |
559 | } | |
560 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
561 | ||
562 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
563 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
564 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
565 | goto error; |
566 | } | |
8abe313a JG |
567 | |
568 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
569 | session_info->name = strdup(name); | |
570 | if (!session_info->name) { | |
ab0ee2ca JG |
571 | goto error; |
572 | } | |
8abe313a JG |
573 | session_info->uid = uid; |
574 | session_info->gid = gid; | |
ea9a44f0 | 575 | session_info->trigger_list = trigger_list; |
1eee26c5 | 576 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
577 | end: |
578 | return session_info; | |
579 | error: | |
580 | session_info_put(session_info); | |
581 | return NULL; | |
582 | } | |
583 | ||
584 | static | |
585 | void session_info_add_channel(struct session_info *session_info, | |
586 | struct channel_info *channel_info) | |
587 | { | |
588 | rcu_read_lock(); | |
589 | cds_lfht_add(session_info->channel_infos_ht, | |
590 | hash_channel_key(&channel_info->key), | |
591 | &channel_info->session_info_channels_ht_node); | |
592 | rcu_read_unlock(); | |
593 | } | |
594 | ||
595 | static | |
596 | void session_info_remove_channel(struct session_info *session_info, | |
597 | struct channel_info *channel_info) | |
598 | { | |
599 | rcu_read_lock(); | |
600 | cds_lfht_del(session_info->channel_infos_ht, | |
601 | &channel_info->session_info_channels_ht_node); | |
602 | rcu_read_unlock(); | |
603 | } | |
604 | ||
605 | static | |
606 | struct channel_info *channel_info_create(const char *channel_name, | |
607 | struct channel_key *channel_key, uint64_t channel_capacity, | |
608 | struct session_info *session_info) | |
609 | { | |
610 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
611 | ||
612 | if (!channel_info) { | |
613 | goto end; | |
614 | } | |
615 | ||
ab0ee2ca | 616 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
617 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
618 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
619 | channel_info->capacity = channel_capacity; | |
620 | ||
621 | channel_info->name = strdup(channel_name); | |
622 | if (!channel_info->name) { | |
623 | goto error; | |
624 | } | |
625 | ||
626 | /* | |
627 | * Set the references between session and channel infos: | |
628 | * - channel_info holds a strong reference to session_info | |
629 | * - session_info holds a weak reference to channel_info | |
630 | */ | |
631 | session_info_get(session_info); | |
632 | session_info_add_channel(session_info, channel_info); | |
633 | channel_info->session_info = session_info; | |
ab0ee2ca | 634 | end: |
8abe313a | 635 | return channel_info; |
ab0ee2ca | 636 | error: |
8abe313a | 637 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
638 | return NULL; |
639 | } | |
640 | ||
f2b3ef9f | 641 | LTTNG_HIDDEN |
505b2d90 JG |
642 | bool notification_client_list_get(struct notification_client_list *list) |
643 | { | |
644 | return urcu_ref_get_unless_zero(&list->ref); | |
645 | } | |
646 | ||
647 | static | |
648 | void free_notification_client_list_rcu(struct rcu_head *node) | |
649 | { | |
650 | free(caa_container_of(node, struct notification_client_list, | |
651 | rcu_node)); | |
652 | } | |
653 | ||
654 | static | |
655 | void notification_client_list_release(struct urcu_ref *list_ref) | |
656 | { | |
657 | struct notification_client_list *list = | |
658 | container_of(list_ref, typeof(*list), ref); | |
659 | struct notification_client_list_element *client_list_element, *tmp; | |
660 | ||
661 | if (list->notification_trigger_clients_ht) { | |
662 | rcu_read_lock(); | |
663 | cds_lfht_del(list->notification_trigger_clients_ht, | |
664 | &list->notification_trigger_clients_ht_node); | |
665 | rcu_read_unlock(); | |
666 | list->notification_trigger_clients_ht = NULL; | |
667 | } | |
668 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
669 | &list->list, node) { | |
670 | free(client_list_element); | |
671 | } | |
672 | pthread_mutex_destroy(&list->lock); | |
673 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
674 | } | |
675 | ||
676 | static | |
677 | struct notification_client_list *notification_client_list_create( | |
678 | const struct lttng_trigger *trigger) | |
679 | { | |
680 | struct notification_client_list *client_list = | |
681 | zmalloc(sizeof(*client_list)); | |
682 | ||
683 | if (!client_list) { | |
684 | goto error; | |
685 | } | |
686 | pthread_mutex_init(&client_list->lock, NULL); | |
687 | urcu_ref_init(&client_list->ref); | |
688 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
689 | CDS_INIT_LIST_HEAD(&client_list->list); | |
690 | client_list->trigger = trigger; | |
691 | error: | |
692 | return client_list; | |
693 | } | |
694 | ||
695 | static | |
696 | void publish_notification_client_list( | |
697 | struct notification_thread_state *state, | |
698 | struct notification_client_list *list) | |
699 | { | |
700 | const struct lttng_condition *condition = | |
701 | lttng_trigger_get_const_condition(list->trigger); | |
702 | ||
703 | assert(!list->notification_trigger_clients_ht); | |
f2b3ef9f | 704 | notification_client_list_get(list); |
505b2d90 JG |
705 | |
706 | list->notification_trigger_clients_ht = | |
707 | state->notification_trigger_clients_ht; | |
708 | ||
709 | rcu_read_lock(); | |
710 | cds_lfht_add(state->notification_trigger_clients_ht, | |
711 | lttng_condition_hash(condition), | |
712 | &list->notification_trigger_clients_ht_node); | |
713 | rcu_read_unlock(); | |
714 | } | |
715 | ||
f2b3ef9f | 716 | LTTNG_HIDDEN |
505b2d90 JG |
717 | void notification_client_list_put(struct notification_client_list *list) |
718 | { | |
719 | if (!list) { | |
720 | return; | |
721 | } | |
722 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
723 | } | |
724 | ||
725 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
726 | static |
727 | struct notification_client_list *get_client_list_from_condition( | |
728 | struct notification_thread_state *state, | |
729 | const struct lttng_condition *condition) | |
730 | { | |
731 | struct cds_lfht_node *node; | |
732 | struct cds_lfht_iter iter; | |
505b2d90 | 733 | struct notification_client_list *list = NULL; |
ed327204 | 734 | |
505b2d90 | 735 | rcu_read_lock(); |
ed327204 JG |
736 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
737 | lttng_condition_hash(condition), | |
738 | match_client_list_condition, | |
739 | condition, | |
740 | &iter); | |
741 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
742 | if (node) { |
743 | list = container_of(node, struct notification_client_list, | |
744 | notification_trigger_clients_ht_node); | |
745 | list = notification_client_list_get(list) ? list : NULL; | |
746 | } | |
ed327204 | 747 | |
505b2d90 JG |
748 | rcu_read_unlock(); |
749 | return list; | |
ed327204 JG |
750 | } |
751 | ||
e4db5ace | 752 | static |
f82f93a1 JG |
753 | int evaluate_channel_condition_for_client( |
754 | const struct lttng_condition *condition, | |
755 | struct notification_thread_state *state, | |
756 | struct lttng_evaluation **evaluation, | |
757 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
758 | { |
759 | int ret; | |
760 | struct cds_lfht_iter iter; | |
761 | struct cds_lfht_node *node; | |
762 | struct channel_info *channel_info = NULL; | |
763 | struct channel_key *channel_key = NULL; | |
764 | struct channel_state_sample *last_sample = NULL; | |
765 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 766 | |
505b2d90 JG |
767 | rcu_read_lock(); |
768 | ||
f82f93a1 | 769 | /* Find the channel associated with the condition. */ |
e4db5ace | 770 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 771 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
772 | struct lttng_trigger_list_element *element; |
773 | ||
774 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 775 | const struct lttng_condition *current_condition = |
f82f93a1 | 776 | lttng_trigger_get_const_condition( |
e4db5ace JR |
777 | element->trigger); |
778 | ||
779 | assert(current_condition); | |
780 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 781 | current_condition)) { |
e4db5ace JR |
782 | continue; |
783 | } | |
784 | ||
785 | /* Found the trigger, save the channel key. */ | |
786 | channel_key = &channel_trigger_list->channel_key; | |
787 | break; | |
788 | } | |
789 | if (channel_key) { | |
790 | /* The channel key was found stop iteration. */ | |
791 | break; | |
792 | } | |
793 | } | |
794 | ||
795 | if (!channel_key){ | |
796 | /* No channel found; normal exit. */ | |
f82f93a1 | 797 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
798 | ret = 0; |
799 | goto end; | |
800 | } | |
801 | ||
802 | /* Fetch channel info for the matching channel. */ | |
803 | cds_lfht_lookup(state->channels_ht, | |
804 | hash_channel_key(channel_key), | |
805 | match_channel_info, | |
806 | channel_key, | |
807 | &iter); | |
808 | node = cds_lfht_iter_get_node(&iter); | |
809 | assert(node); | |
810 | channel_info = caa_container_of(node, struct channel_info, | |
811 | channels_ht_node); | |
812 | ||
813 | /* Retrieve the channel's last sample, if it exists. */ | |
814 | cds_lfht_lookup(state->channel_state_ht, | |
815 | hash_channel_key(channel_key), | |
816 | match_channel_state_sample, | |
817 | channel_key, | |
818 | &iter); | |
819 | node = cds_lfht_iter_get_node(&iter); | |
820 | if (node) { | |
821 | last_sample = caa_container_of(node, | |
822 | struct channel_state_sample, | |
823 | channel_state_ht_node); | |
824 | } else { | |
825 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
826 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
827 | ret = 0; | |
828 | goto end; | |
829 | } | |
830 | ||
f82f93a1 | 831 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
832 | NULL, last_sample, |
833 | 0, channel_info->session_info->consumed_data_size, | |
834 | channel_info); | |
e4db5ace | 835 | if (ret) { |
066a3c82 | 836 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
837 | goto end; |
838 | } | |
839 | ||
f82f93a1 JG |
840 | *session_uid = channel_info->session_info->uid; |
841 | *session_gid = channel_info->session_info->gid; | |
842 | end: | |
505b2d90 | 843 | rcu_read_unlock(); |
f82f93a1 JG |
844 | return ret; |
845 | } | |
846 | ||
847 | static | |
848 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
849 | { | |
850 | const char *session_name = NULL; | |
851 | enum lttng_condition_status status; | |
852 | ||
853 | switch (lttng_condition_get_type(condition)) { | |
854 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
855 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
856 | status = lttng_condition_buffer_usage_get_session_name( | |
857 | condition, &session_name); | |
858 | break; | |
859 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
860 | status = lttng_condition_session_consumed_size_get_session_name( | |
861 | condition, &session_name); | |
862 | break; | |
863 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
864 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
865 | status = lttng_condition_session_rotation_get_session_name( | |
866 | condition, &session_name); | |
867 | break; | |
868 | default: | |
869 | abort(); | |
870 | } | |
871 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
872 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
873 | goto end; | |
874 | } | |
875 | end: | |
876 | return session_name; | |
877 | } | |
878 | ||
f82f93a1 JG |
879 | static |
880 | int evaluate_session_condition_for_client( | |
881 | const struct lttng_condition *condition, | |
882 | struct notification_thread_state *state, | |
883 | struct lttng_evaluation **evaluation, | |
884 | uid_t *session_uid, gid_t *session_gid) | |
885 | { | |
886 | int ret; | |
887 | struct cds_lfht_iter iter; | |
888 | struct cds_lfht_node *node; | |
889 | const char *session_name; | |
890 | struct session_info *session_info = NULL; | |
891 | ||
505b2d90 | 892 | rcu_read_lock(); |
f82f93a1 JG |
893 | session_name = get_condition_session_name(condition); |
894 | ||
895 | /* Find the session associated with the trigger. */ | |
896 | cds_lfht_lookup(state->sessions_ht, | |
897 | hash_key_str(session_name, lttng_ht_seed), | |
898 | match_session, | |
899 | session_name, | |
900 | &iter); | |
901 | node = cds_lfht_iter_get_node(&iter); | |
902 | if (!node) { | |
903 | DBG("[notification-thread] No known session matching name \"%s\"", | |
904 | session_name); | |
905 | ret = 0; | |
906 | goto end; | |
907 | } | |
908 | ||
909 | session_info = caa_container_of(node, struct session_info, | |
910 | sessions_ht_node); | |
911 | session_info_get(session_info); | |
912 | ||
913 | /* | |
914 | * Evaluation is performed in-line here since only one type of | |
915 | * session-bound condition is handled for the moment. | |
916 | */ | |
917 | switch (lttng_condition_get_type(condition)) { | |
918 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
919 | if (!session_info->rotation.ongoing) { | |
be558f88 | 920 | ret = 0; |
f82f93a1 JG |
921 | goto end_session_put; |
922 | } | |
923 | ||
924 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
925 | session_info->rotation.id); | |
926 | if (!*evaluation) { | |
927 | /* Fatal error. */ | |
928 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
929 | session_info->name); | |
930 | ret = -1; | |
931 | goto end_session_put; | |
932 | } | |
933 | ret = 0; | |
934 | break; | |
935 | default: | |
936 | ret = 0; | |
937 | goto end_session_put; | |
938 | } | |
939 | ||
940 | *session_uid = session_info->uid; | |
941 | *session_gid = session_info->gid; | |
942 | ||
943 | end_session_put: | |
944 | session_info_put(session_info); | |
945 | end: | |
505b2d90 | 946 | rcu_read_unlock(); |
f82f93a1 JG |
947 | return ret; |
948 | } | |
949 | ||
f82f93a1 JG |
950 | static |
951 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
952 | const struct lttng_condition *condition, | |
953 | struct notification_client *client, | |
954 | struct notification_thread_state *state) | |
955 | { | |
956 | int ret; | |
957 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
958 | struct notification_client_list client_list = { |
959 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
960 | }; | |
f82f93a1 JG |
961 | struct notification_client_list_element client_list_element = { 0 }; |
962 | uid_t object_uid = 0; | |
963 | gid_t object_gid = 0; | |
964 | ||
965 | assert(trigger); | |
966 | assert(condition); | |
967 | assert(client); | |
968 | assert(state); | |
969 | ||
970 | switch (get_condition_binding_object(condition)) { | |
971 | case LTTNG_OBJECT_TYPE_SESSION: | |
972 | ret = evaluate_session_condition_for_client(condition, state, | |
973 | &evaluation, &object_uid, &object_gid); | |
974 | break; | |
975 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
976 | ret = evaluate_channel_condition_for_client(condition, state, | |
977 | &evaluation, &object_uid, &object_gid); | |
978 | break; | |
979 | case LTTNG_OBJECT_TYPE_NONE: | |
7e802d0a | 980 | DBG("[notification-thread] Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
981 | ret = 0; |
982 | goto end; | |
983 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
984 | default: | |
985 | ret = -1; | |
986 | goto end; | |
987 | } | |
af0c318d JG |
988 | if (ret) { |
989 | /* Fatal error. */ | |
990 | goto end; | |
991 | } | |
e4db5ace JR |
992 | if (!evaluation) { |
993 | /* Evaluation yielded nothing. Normal exit. */ | |
994 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
995 | ret = 0; | |
996 | goto end; | |
997 | } | |
998 | ||
999 | /* | |
1000 | * Create a temporary client list with the client currently | |
1001 | * subscribing. | |
1002 | */ | |
505b2d90 | 1003 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
e4db5ace JR |
1004 | CDS_INIT_LIST_HEAD(&client_list.list); |
1005 | client_list.trigger = trigger; | |
1006 | ||
1007 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1008 | client_list_element.client = client; | |
1009 | cds_list_add(&client_list_element.node, &client_list.list); | |
1010 | ||
1011 | /* Send evaluation result to the newly-subscribed client. */ | |
1012 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
1013 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 1014 | state, object_uid, object_gid); |
e4db5ace JR |
1015 | |
1016 | end: | |
1017 | return ret; | |
1018 | } | |
1019 | ||
ab0ee2ca JG |
1020 | static |
1021 | int notification_thread_client_subscribe(struct notification_client *client, | |
1022 | struct lttng_condition *condition, | |
1023 | struct notification_thread_state *state, | |
1024 | enum lttng_notification_channel_status *_status) | |
1025 | { | |
1026 | int ret = 0; | |
505b2d90 | 1027 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1028 | struct lttng_condition_list_element *condition_list_element = NULL; |
1029 | struct notification_client_list_element *client_list_element = NULL; | |
1030 | enum lttng_notification_channel_status status = | |
1031 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1032 | ||
1033 | /* | |
1034 | * Ensure that the client has not already subscribed to this condition | |
1035 | * before. | |
1036 | */ | |
1037 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1038 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1039 | condition)) { | |
1040 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1041 | goto end; | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1046 | if (!condition_list_element) { | |
1047 | ret = -1; | |
1048 | goto error; | |
1049 | } | |
1050 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1051 | if (!client_list_element) { | |
1052 | ret = -1; | |
1053 | goto error; | |
1054 | } | |
1055 | ||
ab0ee2ca JG |
1056 | /* |
1057 | * Add the newly-subscribed condition to the client's subscription list. | |
1058 | */ | |
1059 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1060 | condition_list_element->condition = condition; | |
1061 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
1062 | ||
ed327204 JG |
1063 | client_list = get_client_list_from_condition(state, condition); |
1064 | if (!client_list) { | |
2ae99f0b JG |
1065 | /* |
1066 | * No notification-emiting trigger registered with this | |
1067 | * condition. We don't evaluate the condition right away | |
1068 | * since this trigger is not registered yet. | |
1069 | */ | |
4fb43b68 | 1070 | free(client_list_element); |
505b2d90 | 1071 | goto end; |
ab0ee2ca JG |
1072 | } |
1073 | ||
2ae99f0b JG |
1074 | /* |
1075 | * The condition to which the client just subscribed is evaluated | |
1076 | * at this point so that conditions that are already TRUE result | |
1077 | * in a notification being sent out. | |
505b2d90 JG |
1078 | * |
1079 | * The client_list's trigger is used without locking the list itself. | |
1080 | * This is correct since the list doesn't own the trigger and the | |
1081 | * object is immutable. | |
2ae99f0b | 1082 | */ |
e4db5ace JR |
1083 | if (evaluate_condition_for_client(client_list->trigger, condition, |
1084 | client, state)) { | |
1085 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1086 | ret = -1; | |
4bd5b4af | 1087 | free(client_list_element); |
505b2d90 | 1088 | goto end; |
e4db5ace JR |
1089 | } |
1090 | ||
1091 | /* | |
1092 | * Add the client to the list of clients interested in a given trigger | |
1093 | * if a "notification" trigger with a corresponding condition was | |
1094 | * added prior. | |
1095 | */ | |
ab0ee2ca JG |
1096 | client_list_element->client = client; |
1097 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1098 | |
1099 | pthread_mutex_lock(&client_list->lock); | |
ab0ee2ca | 1100 | cds_list_add(&client_list_element->node, &client_list->list); |
505b2d90 | 1101 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1102 | end: |
1103 | if (_status) { | |
1104 | *_status = status; | |
1105 | } | |
505b2d90 JG |
1106 | if (client_list) { |
1107 | notification_client_list_put(client_list); | |
1108 | } | |
ab0ee2ca JG |
1109 | return ret; |
1110 | error: | |
1111 | free(condition_list_element); | |
1112 | free(client_list_element); | |
1113 | return ret; | |
1114 | } | |
1115 | ||
1116 | static | |
1117 | int notification_thread_client_unsubscribe( | |
1118 | struct notification_client *client, | |
1119 | struct lttng_condition *condition, | |
1120 | struct notification_thread_state *state, | |
1121 | enum lttng_notification_channel_status *_status) | |
1122 | { | |
ab0ee2ca JG |
1123 | struct notification_client_list *client_list; |
1124 | struct lttng_condition_list_element *condition_list_element, | |
1125 | *condition_tmp; | |
1126 | struct notification_client_list_element *client_list_element, | |
1127 | *client_tmp; | |
1128 | bool condition_found = false; | |
1129 | enum lttng_notification_channel_status status = | |
1130 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1131 | ||
1132 | /* Remove the condition from the client's condition list. */ | |
1133 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1134 | &client->condition_list, node) { | |
1135 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1136 | condition)) { | |
1137 | continue; | |
1138 | } | |
1139 | ||
1140 | cds_list_del(&condition_list_element->node); | |
1141 | /* | |
1142 | * The caller may be iterating on the client's conditions to | |
1143 | * tear down a client's connection. In this case, the condition | |
1144 | * will be destroyed at the end. | |
1145 | */ | |
1146 | if (condition != condition_list_element->condition) { | |
1147 | lttng_condition_destroy( | |
1148 | condition_list_element->condition); | |
1149 | } | |
1150 | free(condition_list_element); | |
1151 | condition_found = true; | |
1152 | break; | |
1153 | } | |
1154 | ||
1155 | if (!condition_found) { | |
1156 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1157 | goto end; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Remove the client from the list of clients interested the trigger | |
1162 | * matching the condition. | |
1163 | */ | |
ed327204 JG |
1164 | client_list = get_client_list_from_condition(state, condition); |
1165 | if (!client_list) { | |
505b2d90 | 1166 | goto end; |
ab0ee2ca JG |
1167 | } |
1168 | ||
505b2d90 | 1169 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
1170 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
1171 | &client_list->list, node) { | |
505b2d90 | 1172 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1173 | continue; |
1174 | } | |
1175 | cds_list_del(&client_list_element->node); | |
1176 | free(client_list_element); | |
1177 | break; | |
1178 | } | |
505b2d90 JG |
1179 | pthread_mutex_unlock(&client_list->lock); |
1180 | notification_client_list_put(client_list); | |
1181 | client_list = NULL; | |
ab0ee2ca JG |
1182 | end: |
1183 | lttng_condition_destroy(condition); | |
1184 | if (_status) { | |
1185 | *_status = status; | |
1186 | } | |
1187 | return 0; | |
1188 | } | |
1189 | ||
83b934ad MD |
1190 | static |
1191 | void free_notification_client_rcu(struct rcu_head *node) | |
1192 | { | |
1193 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1194 | } | |
1195 | ||
ab0ee2ca JG |
1196 | static |
1197 | void notification_client_destroy(struct notification_client *client, | |
1198 | struct notification_thread_state *state) | |
1199 | { | |
ab0ee2ca JG |
1200 | if (!client) { |
1201 | return; | |
1202 | } | |
1203 | ||
505b2d90 JG |
1204 | /* |
1205 | * The client object is not reachable by other threads, no need to lock | |
1206 | * the client here. | |
1207 | */ | |
ab0ee2ca JG |
1208 | if (client->socket >= 0) { |
1209 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1210 | client->socket = -1; |
ab0ee2ca | 1211 | } |
505b2d90 | 1212 | client->communication.active = false; |
882093ee JR |
1213 | lttng_payload_reset(&client->communication.inbound.payload); |
1214 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1215 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1216 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1217 | } |
1218 | ||
1219 | /* | |
1220 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1221 | * client pointer). | |
1222 | */ | |
1223 | static | |
1224 | struct notification_client *get_client_from_socket(int socket, | |
1225 | struct notification_thread_state *state) | |
1226 | { | |
1227 | struct cds_lfht_iter iter; | |
1228 | struct cds_lfht_node *node; | |
1229 | struct notification_client *client = NULL; | |
1230 | ||
1231 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1232 | hash_client_socket(socket), |
1233 | match_client_socket, | |
ab0ee2ca JG |
1234 | (void *) (unsigned long) socket, |
1235 | &iter); | |
1236 | node = cds_lfht_iter_get_node(&iter); | |
1237 | if (!node) { | |
1238 | goto end; | |
1239 | } | |
1240 | ||
1241 | client = caa_container_of(node, struct notification_client, | |
1242 | client_socket_ht_node); | |
1243 | end: | |
1244 | return client; | |
1245 | } | |
1246 | ||
f2b3ef9f JG |
1247 | /* |
1248 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1249 | * client pointer). | |
1250 | */ | |
1251 | static | |
1252 | struct notification_client *get_client_from_id(notification_client_id id, | |
1253 | struct notification_thread_state *state) | |
1254 | { | |
1255 | struct cds_lfht_iter iter; | |
1256 | struct cds_lfht_node *node; | |
1257 | struct notification_client *client = NULL; | |
1258 | ||
1259 | cds_lfht_lookup(state->client_id_ht, | |
1260 | hash_client_id(id), | |
1261 | match_client_id, | |
1262 | &id, | |
1263 | &iter); | |
1264 | node = cds_lfht_iter_get_node(&iter); | |
1265 | if (!node) { | |
1266 | goto end; | |
1267 | } | |
1268 | ||
1269 | client = caa_container_of(node, struct notification_client, | |
1270 | client_id_ht_node); | |
1271 | end: | |
1272 | return client; | |
1273 | } | |
1274 | ||
ab0ee2ca | 1275 | static |
e8360425 | 1276 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1277 | const struct lttng_condition *condition, |
1278 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1279 | { |
1280 | enum lttng_condition_status status; | |
e8360425 JD |
1281 | enum lttng_domain_type condition_domain; |
1282 | const char *condition_session_name = NULL; | |
1283 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1284 | |
e8360425 JD |
1285 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1286 | &condition_domain); | |
1287 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1288 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1289 | goto fail; |
1290 | } | |
1291 | ||
e8360425 JD |
1292 | status = lttng_condition_buffer_usage_get_session_name( |
1293 | condition, &condition_session_name); | |
1294 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1295 | ||
1296 | status = lttng_condition_buffer_usage_get_channel_name( | |
1297 | condition, &condition_channel_name); | |
1298 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1299 | ||
1300 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1301 | goto fail; | |
1302 | } | |
1303 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1304 | goto fail; |
1305 | } | |
1306 | ||
e8360425 JD |
1307 | return true; |
1308 | fail: | |
1309 | return false; | |
1310 | } | |
1311 | ||
1312 | static | |
1313 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1314 | const struct lttng_condition *condition, |
1315 | const struct channel_info *channel_info) | |
e8360425 JD |
1316 | { |
1317 | enum lttng_condition_status status; | |
1318 | const char *condition_session_name = NULL; | |
1319 | ||
1320 | status = lttng_condition_session_consumed_size_get_session_name( | |
1321 | condition, &condition_session_name); | |
1322 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1323 | ||
1324 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1325 | goto fail; |
1326 | } | |
1327 | ||
e8360425 JD |
1328 | return true; |
1329 | fail: | |
1330 | return false; | |
1331 | } | |
ab0ee2ca | 1332 | |
51eab943 JG |
1333 | static |
1334 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1335 | const struct channel_info *channel_info) | |
1336 | { | |
1337 | const struct lttng_condition *condition; | |
e8360425 | 1338 | bool trigger_applies; |
ab0ee2ca | 1339 | |
51eab943 | 1340 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1341 | if (!condition) { |
ab0ee2ca JG |
1342 | goto fail; |
1343 | } | |
e8360425 JD |
1344 | |
1345 | switch (lttng_condition_get_type(condition)) { | |
1346 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1347 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1348 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1349 | condition, channel_info); | |
1350 | break; | |
1351 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1352 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1353 | condition, channel_info); | |
1354 | break; | |
1355 | default: | |
ab0ee2ca JG |
1356 | goto fail; |
1357 | } | |
1358 | ||
e8360425 | 1359 | return trigger_applies; |
ab0ee2ca JG |
1360 | fail: |
1361 | return false; | |
1362 | } | |
1363 | ||
1364 | static | |
1365 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1366 | struct notification_client *client) | |
1367 | { | |
1368 | bool applies = false; | |
1369 | struct lttng_condition_list_element *condition_list_element; | |
1370 | ||
1371 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1372 | node) { | |
1373 | applies = lttng_condition_is_equal( | |
1374 | condition_list_element->condition, | |
1375 | lttng_trigger_get_condition(trigger)); | |
1376 | if (applies) { | |
1377 | break; | |
1378 | } | |
1379 | } | |
1380 | return applies; | |
1381 | } | |
1382 | ||
ed327204 JG |
1383 | /* Must be called with RCU read lock held. */ |
1384 | static | |
1385 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1386 | struct notification_thread_state *state, | |
1387 | const char *session_name) | |
1388 | { | |
1389 | struct lttng_session_trigger_list *list = NULL; | |
1390 | struct cds_lfht_node *node; | |
1391 | struct cds_lfht_iter iter; | |
1392 | ||
1393 | cds_lfht_lookup(state->session_triggers_ht, | |
1394 | hash_key_str(session_name, lttng_ht_seed), | |
1395 | match_session_trigger_list, | |
1396 | session_name, | |
1397 | &iter); | |
1398 | node = cds_lfht_iter_get_node(&iter); | |
1399 | if (!node) { | |
1400 | /* | |
1401 | * Not an error, the list of triggers applying to that session | |
1402 | * will be initialized when the session is created. | |
1403 | */ | |
1404 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1405 | session_name); | |
1406 | goto end; | |
1407 | } | |
1408 | ||
e742b055 | 1409 | list = caa_container_of(node, |
ed327204 JG |
1410 | struct lttng_session_trigger_list, |
1411 | session_triggers_ht_node); | |
1412 | end: | |
1413 | return list; | |
1414 | } | |
1415 | ||
ea9a44f0 JG |
1416 | /* |
1417 | * Allocate an empty lttng_session_trigger_list for the session named | |
1418 | * 'session_name'. | |
1419 | * | |
1420 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1421 | * It is the caller's responsability to ensure the session name is alive | |
1422 | * for as long as this list is. | |
1423 | */ | |
1424 | static | |
1425 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1426 | const char *session_name, | |
1427 | struct cds_lfht *session_triggers_ht) | |
1428 | { | |
1429 | struct lttng_session_trigger_list *list; | |
1430 | ||
1431 | list = zmalloc(sizeof(*list)); | |
1432 | if (!list) { | |
1433 | goto end; | |
1434 | } | |
1435 | list->session_name = session_name; | |
1436 | CDS_INIT_LIST_HEAD(&list->list); | |
1437 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1438 | list->session_triggers_ht = session_triggers_ht; | |
1439 | ||
1440 | rcu_read_lock(); | |
1441 | /* Publish the list through the session_triggers_ht. */ | |
1442 | cds_lfht_add(session_triggers_ht, | |
1443 | hash_key_str(session_name, lttng_ht_seed), | |
1444 | &list->session_triggers_ht_node); | |
1445 | rcu_read_unlock(); | |
1446 | end: | |
1447 | return list; | |
1448 | } | |
1449 | ||
1450 | static | |
1451 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1452 | { | |
1453 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1454 | rcu_node)); | |
1455 | } | |
1456 | ||
1457 | static | |
1458 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1459 | { | |
1460 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1461 | ||
1462 | /* Empty the list element by element, and then free the list itself. */ | |
1463 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1464 | &list->list, node) { | |
1465 | cds_list_del(&trigger_list_element->node); | |
1466 | free(trigger_list_element); | |
1467 | } | |
1468 | rcu_read_lock(); | |
1469 | /* Unpublish the list from the session_triggers_ht. */ | |
1470 | cds_lfht_del(list->session_triggers_ht, | |
1471 | &list->session_triggers_ht_node); | |
1472 | rcu_read_unlock(); | |
1473 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1474 | } | |
1475 | ||
1476 | static | |
1477 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1478 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1479 | { |
1480 | int ret = 0; | |
1481 | struct lttng_trigger_list_element *new_element = | |
1482 | zmalloc(sizeof(*new_element)); | |
1483 | ||
1484 | if (!new_element) { | |
1485 | ret = -1; | |
1486 | goto end; | |
1487 | } | |
1488 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1489 | new_element->trigger = trigger; | |
1490 | cds_list_add(&new_element->node, &list->list); | |
1491 | end: | |
1492 | return ret; | |
1493 | } | |
1494 | ||
1495 | static | |
1496 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1497 | const char *session_name) | |
1498 | { | |
1499 | bool applies = false; | |
1500 | const struct lttng_condition *condition; | |
1501 | ||
1502 | condition = lttng_trigger_get_const_condition(trigger); | |
1503 | switch (lttng_condition_get_type(condition)) { | |
1504 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1505 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1506 | { | |
1507 | enum lttng_condition_status condition_status; | |
1508 | const char *condition_session_name; | |
1509 | ||
1510 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1511 | condition, &condition_session_name); | |
1512 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1513 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1514 | goto end; | |
1515 | } | |
1516 | ||
1517 | assert(condition_session_name); | |
1518 | applies = !strcmp(condition_session_name, session_name); | |
1519 | break; | |
1520 | } | |
1521 | default: | |
1522 | goto end; | |
1523 | } | |
1524 | end: | |
1525 | return applies; | |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1530 | * all triggers that apply to the session named 'session_name'. | |
1531 | * | |
1532 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1533 | * It is the caller's responsability to ensure the session name is alive | |
1534 | * for as long as this list is. | |
1535 | */ | |
1536 | static | |
1537 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1538 | const struct notification_thread_state *state, | |
1539 | const char *session_name) | |
1540 | { | |
1541 | int trigger_count = 0; | |
1542 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1543 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1544 | struct cds_lfht_iter iter; | |
1545 | ||
1546 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1547 | state->session_triggers_ht); | |
1548 | ||
1549 | /* Add all triggers applying to the session named 'session_name'. */ | |
1550 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1551 | node) { | |
1552 | int ret; | |
1553 | ||
1554 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1555 | session_name)) { | |
1556 | continue; | |
1557 | } | |
1558 | ||
1559 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1560 | trigger_ht_element->trigger); | |
1561 | if (ret) { | |
1562 | goto error; | |
1563 | } | |
1564 | ||
1565 | trigger_count++; | |
1566 | } | |
1567 | ||
1568 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1569 | trigger_count); | |
1570 | return session_trigger_list; | |
1571 | error: | |
1572 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1573 | return NULL; | |
1574 | } | |
1575 | ||
8abe313a JG |
1576 | static |
1577 | struct session_info *find_or_create_session_info( | |
1578 | struct notification_thread_state *state, | |
1579 | const char *name, uid_t uid, gid_t gid) | |
1580 | { | |
1581 | struct session_info *session = NULL; | |
1582 | struct cds_lfht_node *node; | |
1583 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1584 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1585 | |
1586 | rcu_read_lock(); | |
1587 | cds_lfht_lookup(state->sessions_ht, | |
1588 | hash_key_str(name, lttng_ht_seed), | |
1589 | match_session, | |
1590 | name, | |
1591 | &iter); | |
1592 | node = cds_lfht_iter_get_node(&iter); | |
1593 | if (node) { | |
1594 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1595 | name, uid, gid); | |
1596 | session = caa_container_of(node, struct session_info, | |
1597 | sessions_ht_node); | |
1598 | assert(session->uid == uid); | |
1599 | assert(session->gid == gid); | |
1eee26c5 JG |
1600 | session_info_get(session); |
1601 | goto end; | |
ea9a44f0 JG |
1602 | } |
1603 | ||
1604 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1605 | if (!trigger_list) { | |
1606 | goto error; | |
8abe313a JG |
1607 | } |
1608 | ||
1eee26c5 JG |
1609 | session = session_info_create(name, uid, gid, trigger_list, |
1610 | state->sessions_ht); | |
8abe313a JG |
1611 | if (!session) { |
1612 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1613 | name, uid, gid); | |
b248644d | 1614 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1615 | goto error; |
8abe313a | 1616 | } |
ea9a44f0 | 1617 | trigger_list = NULL; |
577983cb JG |
1618 | |
1619 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1620 | &session->sessions_ht_node); |
1eee26c5 | 1621 | end: |
8abe313a JG |
1622 | rcu_read_unlock(); |
1623 | return session; | |
ea9a44f0 JG |
1624 | error: |
1625 | rcu_read_unlock(); | |
1626 | session_info_put(session); | |
1627 | return NULL; | |
8abe313a JG |
1628 | } |
1629 | ||
ab0ee2ca JG |
1630 | static |
1631 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1632 | struct notification_thread_state *state, |
1633 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1634 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1635 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1636 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1637 | { |
1638 | struct cds_list_head trigger_list; | |
8abe313a JG |
1639 | struct channel_info *new_channel_info = NULL; |
1640 | struct channel_key channel_key = { | |
1641 | .key = channel_key_int, | |
1642 | .domain = channel_domain, | |
1643 | }; | |
ab0ee2ca JG |
1644 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1645 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1646 | int trigger_count = 0; | |
1647 | struct cds_lfht_iter iter; | |
8abe313a | 1648 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1649 | |
1650 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a | 1651 | channel_name, session_name, channel_key_int, |
526200e4 | 1652 | lttng_domain_type_str(channel_domain)); |
ab0ee2ca JG |
1653 | |
1654 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1655 | ||
8abe313a JG |
1656 | session_info = find_or_create_session_info(state, session_name, |
1657 | session_uid, session_gid); | |
1658 | if (!session_info) { | |
a9577b76 | 1659 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1660 | goto error; |
1661 | } | |
1662 | ||
8abe313a JG |
1663 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1664 | channel_capacity, session_info); | |
1665 | if (!new_channel_info) { | |
1666 | goto error; | |
1667 | } | |
ab0ee2ca | 1668 | |
83b934ad | 1669 | rcu_read_lock(); |
ab0ee2ca JG |
1670 | /* Build a list of all triggers applying to the new channel. */ |
1671 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1672 | node) { | |
1673 | struct lttng_trigger_list_element *new_element; | |
1674 | ||
1675 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1676 | new_channel_info)) { |
ab0ee2ca JG |
1677 | continue; |
1678 | } | |
1679 | ||
1680 | new_element = zmalloc(sizeof(*new_element)); | |
1681 | if (!new_element) { | |
83b934ad | 1682 | rcu_read_unlock(); |
ab0ee2ca JG |
1683 | goto error; |
1684 | } | |
1685 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1686 | new_element->trigger = trigger_ht_element->trigger; | |
1687 | cds_list_add(&new_element->node, &trigger_list); | |
1688 | trigger_count++; | |
1689 | } | |
83b934ad | 1690 | rcu_read_unlock(); |
ab0ee2ca JG |
1691 | |
1692 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1693 | trigger_count); | |
1694 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1695 | if (!channel_trigger_list) { | |
1696 | goto error; | |
1697 | } | |
8abe313a | 1698 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1699 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1700 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1701 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1702 | ||
1703 | rcu_read_lock(); | |
1704 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1705 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1706 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1707 | &new_channel_info->channels_ht_node); |
1708 | /* | |
1709 | * Add the list of triggers associated with this channel to the | |
1710 | * channel_triggers_ht. | |
1711 | */ | |
1712 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1713 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1714 | &channel_trigger_list->channel_triggers_ht_node); |
1715 | rcu_read_unlock(); | |
1eee26c5 | 1716 | session_info_put(session_info); |
ab0ee2ca JG |
1717 | *cmd_result = LTTNG_OK; |
1718 | return 0; | |
1719 | error: | |
ab0ee2ca | 1720 | channel_info_destroy(new_channel_info); |
8abe313a | 1721 | session_info_put(session_info); |
ab0ee2ca JG |
1722 | return 1; |
1723 | } | |
1724 | ||
83b934ad MD |
1725 | static |
1726 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1727 | { | |
1728 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1729 | rcu_node)); | |
1730 | } | |
1731 | ||
1732 | static | |
1733 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1734 | { | |
1735 | free(caa_container_of(node, struct channel_state_sample, | |
1736 | rcu_node)); | |
1737 | } | |
1738 | ||
ab0ee2ca JG |
1739 | static |
1740 | int handle_notification_thread_command_remove_channel( | |
1741 | struct notification_thread_state *state, | |
1742 | uint64_t channel_key, enum lttng_domain_type domain, | |
1743 | enum lttng_error_code *cmd_result) | |
1744 | { | |
1745 | struct cds_lfht_node *node; | |
1746 | struct cds_lfht_iter iter; | |
1747 | struct lttng_channel_trigger_list *trigger_list; | |
1748 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1749 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1750 | struct channel_info *channel_info; | |
1751 | ||
1752 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
526200e4 | 1753 | channel_key, lttng_domain_type_str(domain)); |
ab0ee2ca JG |
1754 | |
1755 | rcu_read_lock(); | |
1756 | ||
1757 | cds_lfht_lookup(state->channel_triggers_ht, | |
1758 | hash_channel_key(&key), | |
1759 | match_channel_trigger_list, | |
1760 | &key, | |
1761 | &iter); | |
1762 | node = cds_lfht_iter_get_node(&iter); | |
1763 | /* | |
1764 | * There is a severe internal error if we are being asked to remove a | |
1765 | * channel that doesn't exist. | |
1766 | */ | |
1767 | if (!node) { | |
1768 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1769 | goto end; | |
1770 | } | |
1771 | ||
1772 | /* Free the list of triggers associated with this channel. */ | |
1773 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1774 | channel_triggers_ht_node); | |
1775 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1776 | &trigger_list->list, node) { | |
1777 | cds_list_del(&trigger_list_element->node); | |
1778 | free(trigger_list_element); | |
1779 | } | |
1780 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1781 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1782 | |
1783 | /* Free sampled channel state. */ | |
1784 | cds_lfht_lookup(state->channel_state_ht, | |
1785 | hash_channel_key(&key), | |
1786 | match_channel_state_sample, | |
1787 | &key, | |
1788 | &iter); | |
1789 | node = cds_lfht_iter_get_node(&iter); | |
1790 | /* | |
1791 | * This is expected to be NULL if the channel is destroyed before we | |
1792 | * received a sample. | |
1793 | */ | |
1794 | if (node) { | |
1795 | struct channel_state_sample *sample = caa_container_of(node, | |
1796 | struct channel_state_sample, | |
1797 | channel_state_ht_node); | |
1798 | ||
1799 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1800 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1801 | } |
1802 | ||
1803 | /* Remove the channel from the channels_ht and free it. */ | |
1804 | cds_lfht_lookup(state->channels_ht, | |
1805 | hash_channel_key(&key), | |
1806 | match_channel_info, | |
1807 | &key, | |
1808 | &iter); | |
1809 | node = cds_lfht_iter_get_node(&iter); | |
1810 | assert(node); | |
1811 | channel_info = caa_container_of(node, struct channel_info, | |
1812 | channels_ht_node); | |
1813 | cds_lfht_del(state->channels_ht, node); | |
1814 | channel_info_destroy(channel_info); | |
1815 | end: | |
1816 | rcu_read_unlock(); | |
1817 | *cmd_result = LTTNG_OK; | |
1818 | return 0; | |
1819 | } | |
1820 | ||
0ca52944 | 1821 | static |
ed327204 | 1822 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1823 | struct notification_thread_state *state, |
ed327204 JG |
1824 | enum notification_thread_command_type cmd_type, |
1825 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1826 | uint64_t trace_archive_chunk_id, | |
1827 | struct lttng_trace_archive_location *location, | |
1828 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1829 | { |
ed327204 JG |
1830 | int ret = 0; |
1831 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1832 | struct lttng_session_trigger_list *trigger_list; | |
1833 | struct lttng_trigger_list_element *trigger_list_element; | |
1834 | struct session_info *session_info; | |
f2b3ef9f | 1835 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1836 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1837 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1838 | }; |
0ca52944 | 1839 | |
ed327204 JG |
1840 | rcu_read_lock(); |
1841 | ||
1842 | session_info = find_or_create_session_info(state, session_name, | |
1843 | session_uid, session_gid); | |
1844 | if (!session_info) { | |
a9577b76 | 1845 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1846 | ret = -1; |
1847 | cmd_result = LTTNG_ERR_NOMEM; | |
1848 | goto end; | |
1849 | } | |
1850 | ||
1851 | session_info->rotation.ongoing = | |
1852 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1853 | session_info->rotation.id = trace_archive_chunk_id; | |
1854 | trigger_list = get_session_trigger_list(state, session_name); | |
1855 | if (!trigger_list) { | |
1856 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1857 | session_name); | |
1858 | goto end; | |
1859 | } | |
1860 | ||
1861 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1862 | node) { | |
1863 | const struct lttng_condition *condition; | |
f2b3ef9f | 1864 | struct lttng_trigger *trigger; |
ed327204 JG |
1865 | struct notification_client_list *client_list; |
1866 | struct lttng_evaluation *evaluation = NULL; | |
1867 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1868 | enum action_executor_status executor_status; |
ed327204 JG |
1869 | |
1870 | trigger = trigger_list_element->trigger; | |
1871 | condition = lttng_trigger_get_const_condition(trigger); | |
1872 | assert(condition); | |
1873 | condition_type = lttng_condition_get_type(condition); | |
1874 | ||
1875 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1876 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1877 | continue; | |
1878 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1879 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1880 | continue; | |
1881 | } | |
1882 | ||
ed327204 | 1883 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1884 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1885 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1886 | trace_archive_chunk_id); | |
1887 | } else { | |
1888 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1889 | trace_archive_chunk_id, location); | |
1890 | } | |
1891 | ||
1892 | if (!evaluation) { | |
1893 | /* Internal error */ | |
1894 | ret = -1; | |
1895 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1896 | goto put_list; |
ed327204 JG |
1897 | } |
1898 | ||
f2b3ef9f JG |
1899 | /* |
1900 | * Ownership of `evaluation` transferred to the action executor | |
1901 | * no matter the result. | |
1902 | */ | |
1903 | executor_status = action_executor_enqueue(state->executor, | |
1904 | trigger, evaluation, &session_creds, | |
1905 | client_list); | |
1906 | evaluation = NULL; | |
1907 | switch (executor_status) { | |
1908 | case ACTION_EXECUTOR_STATUS_OK: | |
1909 | break; | |
1910 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1911 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1912 | /* | |
1913 | * TODO Add trigger identification (name/id) when | |
1914 | * it is added to the API. | |
1915 | */ | |
1916 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1917 | ret = -1; | |
1918 | goto put_list; | |
1919 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1920 | /* | |
1921 | * TODO Add trigger identification (name/id) when | |
1922 | * it is added to the API. | |
1923 | * | |
1924 | * Not a fatal error. | |
1925 | */ | |
1926 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1927 | ret = 0; | |
1928 | goto put_list; | |
1929 | default: | |
1930 | abort(); | |
1931 | } | |
1932 | ||
505b2d90 JG |
1933 | put_list: |
1934 | notification_client_list_put(client_list); | |
ed327204 | 1935 | if (caa_unlikely(ret)) { |
505b2d90 | 1936 | break; |
ed327204 JG |
1937 | } |
1938 | } | |
1939 | end: | |
1940 | session_info_put(session_info); | |
1941 | *_cmd_result = cmd_result; | |
1942 | rcu_read_unlock(); | |
1943 | return ret; | |
0ca52944 JG |
1944 | } |
1945 | ||
d02d7404 JR |
1946 | static |
1947 | int handle_notification_thread_command_add_tracer_event_source( | |
1948 | struct notification_thread_state *state, | |
1949 | int tracer_event_source_fd, | |
1950 | enum lttng_domain_type domain_type, | |
1951 | enum lttng_error_code *_cmd_result) | |
1952 | { | |
1953 | int ret = 0; | |
1954 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1955 | struct notification_event_tracer_event_source_element *element = NULL; | |
1956 | ||
1957 | element = zmalloc(sizeof(*element)); | |
1958 | if (!element) { | |
1959 | cmd_result = LTTNG_ERR_NOMEM; | |
1960 | ret = -1; | |
1961 | goto end; | |
1962 | } | |
1963 | ||
d02d7404 JR |
1964 | element->fd = tracer_event_source_fd; |
1965 | element->domain = domain_type; | |
1966 | ||
1967 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
1968 | ||
1969 | DBG3("[notification-thread] Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1970 | tracer_event_source_fd, | |
1971 | lttng_domain_type_str(domain_type)); | |
1972 | ||
1973 | /* Adding the read side pipe to the event poll. */ | |
1974 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLIN | LPOLLERR); | |
1975 | if (ret < 0) { | |
1976 | ERR("[notification-thread] Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1977 | tracer_event_source_fd, | |
1978 | lttng_domain_type_str(element->domain)); | |
1979 | cds_list_del(&element->node); | |
1980 | free(element); | |
1981 | goto end; | |
1982 | } | |
1983 | ||
1984 | element->is_fd_in_poll_set = true; | |
1985 | ||
1986 | end: | |
1987 | *_cmd_result = cmd_result; | |
1988 | return ret; | |
1989 | } | |
1990 | ||
8b524060 FD |
1991 | static |
1992 | int drain_event_notifier_notification_pipe( | |
1993 | struct notification_thread_state *state, | |
1994 | int pipe, enum lttng_domain_type domain) | |
1995 | { | |
1996 | struct lttng_poll_event events = {0}; | |
1997 | int ret; | |
1998 | ||
1999 | ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC); | |
2000 | if (ret < 0) { | |
2001 | ERR("[notification-thread] Error creating lttng_poll_event"); | |
2002 | goto end; | |
2003 | } | |
2004 | ||
2005 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2006 | if (ret < 0) { | |
2007 | ERR("[notification-thread] Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", | |
2008 | pipe); | |
2009 | goto end; | |
2010 | } | |
2011 | ||
2012 | while (true) { | |
2013 | /* | |
2014 | * Continue to consume notifications as long as there are new | |
2015 | * ones coming in. The tracer has been asked to stop producing | |
2016 | * them. | |
2017 | * | |
2018 | * LPOLLIN is explicitly checked since LPOLLHUP is implicitly | |
2019 | * monitored (on Linux, at least) and will be returned when | |
2020 | * the pipe is closed but empty. | |
2021 | */ | |
2022 | ret = lttng_poll_wait_interruptible(&events, 0); | |
a17b133b | 2023 | if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) { |
8b524060 FD |
2024 | /* No more notification to be read on this pipe. */ |
2025 | ret = 0; | |
2026 | goto end; | |
2027 | } else if (ret < 0) { | |
2028 | PERROR("Failed on lttng_poll_wait_interruptible() call"); | |
2029 | ret = -1; | |
2030 | goto end; | |
2031 | } | |
2032 | ||
2033 | ret = handle_one_event_notifier_notification(state, pipe, domain); | |
2034 | if (ret) { | |
2035 | ERR("[notification-thread] Error consuming an event notifier notification from pipe: fd = %d", | |
2036 | pipe); | |
2037 | } | |
2038 | } | |
2039 | end: | |
2040 | lttng_poll_clean(&events); | |
2041 | return ret; | |
2042 | } | |
2043 | ||
d02d7404 JR |
2044 | static |
2045 | int handle_notification_thread_command_remove_tracer_event_source( | |
2046 | struct notification_thread_state *state, | |
2047 | int tracer_event_source_fd, | |
2048 | enum lttng_error_code *_cmd_result) | |
2049 | { | |
2050 | int ret = 0; | |
2fb5e9b7 | 2051 | bool found = false; |
d02d7404 JR |
2052 | enum lttng_error_code cmd_result = LTTNG_OK; |
2053 | struct notification_event_tracer_event_source_element *source_element = NULL, *tmp; | |
2054 | ||
2055 | cds_list_for_each_entry_safe(source_element, tmp, | |
2056 | &state->tracer_event_sources_list, node) { | |
2057 | if (source_element->fd != tracer_event_source_fd) { | |
2058 | continue; | |
2059 | } | |
2060 | ||
2061 | DBG("[notification-thread] Removed tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2062 | tracer_event_source_fd, | |
2063 | lttng_domain_type_str(source_element->domain)); | |
2064 | cds_list_del(&source_element->node); | |
2fb5e9b7 | 2065 | found = true; |
d02d7404 JR |
2066 | break; |
2067 | } | |
2068 | ||
2fb5e9b7 JG |
2069 | if (!found) { |
2070 | /* | |
2071 | * This is temporarily allowed since the poll activity set is | |
2072 | * not properly cleaned-up for the moment. This is adressed in | |
2073 | * an upcoming fix. | |
2074 | */ | |
2075 | source_element = NULL; | |
2076 | goto end; | |
2077 | } | |
d02d7404 JR |
2078 | |
2079 | if (!source_element->is_fd_in_poll_set) { | |
2080 | /* Skip the poll set removal. */ | |
2081 | goto end; | |
2082 | } | |
2083 | ||
2084 | DBG3("[notification-thread] Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2085 | tracer_event_source_fd, | |
2086 | lttng_domain_type_str(source_element->domain)); | |
2087 | ||
2088 | /* Removing the fd from the event poll set. */ | |
2089 | ret = lttng_poll_del(&state->events, tracer_event_source_fd); | |
2090 | if (ret < 0) { | |
2091 | ERR("[notification-thread] Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2092 | tracer_event_source_fd, | |
2093 | lttng_domain_type_str(source_element->domain)); | |
2094 | cmd_result = LTTNG_ERR_FATAL; | |
2095 | goto end; | |
2096 | } | |
2097 | ||
173900f6 JG |
2098 | source_element->is_fd_in_poll_set = false; |
2099 | ||
8b524060 FD |
2100 | ret = drain_event_notifier_notification_pipe(state, tracer_event_source_fd, |
2101 | source_element->domain); | |
2102 | if (ret) { | |
2103 | ERR("[notification-thread] Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", | |
2104 | tracer_event_source_fd, | |
2105 | lttng_domain_type_str(source_element->domain)); | |
2106 | cmd_result = LTTNG_ERR_FATAL; | |
2107 | goto end; | |
2108 | } | |
2109 | ||
2110 | /* | |
2111 | * The drain_event_notifier_notification_pipe() call might have read | |
2112 | * data from an fd that we received in event in the latest _poll_wait() | |
2113 | * call. Make sure the thread call poll_wait() again to ensure we have | |
2114 | * a clean state. | |
2115 | */ | |
2116 | state->restart_poll = true; | |
2117 | ||
d02d7404 JR |
2118 | end: |
2119 | free(source_element); | |
2120 | *_cmd_result = cmd_result; | |
2121 | return ret; | |
2122 | } | |
2123 | ||
2124 | int handle_notification_thread_remove_tracer_event_source_no_result( | |
2125 | struct notification_thread_state *state, | |
2126 | int tracer_event_source_fd) | |
2127 | { | |
2128 | int ret; | |
2129 | enum lttng_error_code cmd_result; | |
2130 | ||
2131 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2132 | state, tracer_event_source_fd, &cmd_result); | |
2133 | (void) cmd_result; | |
2134 | return ret; | |
2135 | } | |
2136 | ||
fbc9f37d JR |
2137 | static int handle_notification_thread_command_list_triggers( |
2138 | struct notification_thread_handle *handle, | |
2139 | struct notification_thread_state *state, | |
2140 | uid_t client_uid, | |
2141 | struct lttng_triggers **triggers, | |
2142 | enum lttng_error_code *_cmd_result) | |
2143 | { | |
2144 | int ret = 0; | |
2145 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2146 | struct cds_lfht_iter iter; | |
2147 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2148 | struct lttng_triggers *local_triggers = NULL; | |
2149 | const struct lttng_credentials *creds; | |
2150 | ||
2151 | rcu_read_lock(); | |
2152 | ||
2153 | local_triggers = lttng_triggers_create(); | |
2154 | if (!local_triggers) { | |
2155 | /* Not a fatal error. */ | |
2156 | cmd_result = LTTNG_ERR_NOMEM; | |
2157 | goto end; | |
2158 | } | |
2159 | ||
2160 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2161 | trigger_ht_element, node) { | |
2162 | /* | |
2163 | * Only return the triggers to which the client has access. | |
2164 | * The root user has visibility over all triggers. | |
2165 | */ | |
2166 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2167 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2168 | continue; | |
2169 | } | |
2170 | ||
2171 | ret = lttng_triggers_add(local_triggers, | |
2172 | trigger_ht_element->trigger); | |
2173 | if (ret < 0) { | |
2174 | /* Not a fatal error. */ | |
2175 | ret = 0; | |
2176 | cmd_result = LTTNG_ERR_NOMEM; | |
2177 | goto end; | |
2178 | } | |
2179 | } | |
2180 | ||
2181 | /* Transferring ownership to the caller. */ | |
2182 | *triggers = local_triggers; | |
2183 | local_triggers = NULL; | |
2184 | ||
2185 | end: | |
2186 | rcu_read_unlock(); | |
2187 | lttng_triggers_destroy(local_triggers); | |
2188 | *_cmd_result = cmd_result; | |
2189 | return ret; | |
2190 | } | |
2191 | ||
1da26331 | 2192 | static |
959e3c66 | 2193 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2194 | { |
959e3c66 | 2195 | bool is_supported; |
1da26331 JG |
2196 | |
2197 | switch (lttng_condition_get_type(condition)) { | |
2198 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2199 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2200 | { | |
959e3c66 | 2201 | int ret; |
1da26331 JG |
2202 | enum lttng_domain_type domain; |
2203 | ||
2204 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2205 | &domain); | |
959e3c66 | 2206 | assert(ret == 0); |
1da26331 JG |
2207 | |
2208 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2209 | is_supported = true; |
1da26331 JG |
2210 | goto end; |
2211 | } | |
2212 | ||
2213 | /* | |
2214 | * Older kernel tracers don't expose the API to monitor their | |
2215 | * buffers. Therefore, we reject triggers that require that | |
2216 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2217 | * |
2218 | * Assume unsupported on error. | |
1da26331 | 2219 | */ |
959e3c66 JR |
2220 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2221 | break; | |
2222 | } | |
2223 | case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT: | |
2224 | { | |
2225 | const struct lttng_event_rule *event_rule; | |
2226 | enum lttng_domain_type domain; | |
2227 | const enum lttng_condition_status status = | |
2228 | lttng_condition_event_rule_get_rule( | |
2229 | condition, &event_rule); | |
2230 | ||
2231 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
2232 | ||
2233 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2234 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2235 | is_supported = true; | |
2236 | goto end; | |
2237 | } | |
2238 | ||
2239 | /* | |
2240 | * Older kernel tracers can't emit notification. Therefore, we | |
2241 | * reject triggers that require that mechanism to be available | |
2242 | * to be evaluated. | |
2243 | * | |
2244 | * Assume unsupported on error. | |
2245 | */ | |
2246 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2247 | break; |
2248 | } | |
2249 | default: | |
959e3c66 | 2250 | is_supported = true; |
1da26331 JG |
2251 | } |
2252 | end: | |
959e3c66 | 2253 | return is_supported; |
1da26331 JG |
2254 | } |
2255 | ||
51eab943 JG |
2256 | /* Must be called with RCU read lock held. */ |
2257 | static | |
f2b3ef9f | 2258 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2259 | struct notification_thread_state *state) |
2260 | { | |
2261 | int ret = 0; | |
51eab943 JG |
2262 | const struct lttng_condition *condition; |
2263 | const char *session_name; | |
2264 | struct lttng_session_trigger_list *trigger_list; | |
2265 | ||
2266 | condition = lttng_trigger_get_const_condition(trigger); | |
2267 | switch (lttng_condition_get_type(condition)) { | |
2268 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2269 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2270 | { | |
2271 | enum lttng_condition_status status; | |
2272 | ||
2273 | status = lttng_condition_session_rotation_get_session_name( | |
2274 | condition, &session_name); | |
2275 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
2276 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
2277 | ret = -1; | |
2278 | goto end; | |
2279 | } | |
2280 | break; | |
2281 | } | |
2282 | default: | |
2283 | ret = -1; | |
2284 | goto end; | |
2285 | } | |
2286 | ||
ed327204 JG |
2287 | trigger_list = get_session_trigger_list(state, session_name); |
2288 | if (!trigger_list) { | |
51eab943 JG |
2289 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
2290 | session_name); | |
2291 | goto end; | |
51eab943 | 2292 | |
ed327204 | 2293 | } |
51eab943 JG |
2294 | |
2295 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
2296 | session_name); | |
2297 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2298 | end: | |
2299 | return ret; | |
2300 | } | |
2301 | ||
2302 | /* Must be called with RCU read lock held. */ | |
2303 | static | |
f2b3ef9f | 2304 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2305 | struct notification_thread_state *state) |
2306 | { | |
2307 | int ret = 0; | |
2308 | struct cds_lfht_node *node; | |
2309 | struct cds_lfht_iter iter; | |
2310 | struct channel_info *channel; | |
2311 | ||
2312 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2313 | channels_ht_node) { | |
2314 | struct lttng_trigger_list_element *trigger_list_element; | |
2315 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2316 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2317 | |
2318 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2319 | continue; | |
2320 | } | |
2321 | ||
2322 | cds_lfht_lookup(state->channel_triggers_ht, | |
2323 | hash_channel_key(&channel->key), | |
2324 | match_channel_trigger_list, | |
2325 | &channel->key, | |
a5d64ae7 MD |
2326 | &lookup_iter); |
2327 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2328 | assert(node); |
2329 | trigger_list = caa_container_of(node, | |
2330 | struct lttng_channel_trigger_list, | |
2331 | channel_triggers_ht_node); | |
2332 | ||
2333 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2334 | if (!trigger_list_element) { | |
2335 | ret = -1; | |
2336 | goto end; | |
2337 | } | |
2338 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2339 | trigger_list_element->trigger = trigger; | |
2340 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2341 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2342 | channel->name); | |
2343 | } | |
2344 | end: | |
2345 | return ret; | |
2346 | } | |
2347 | ||
f2b3ef9f JG |
2348 | static |
2349 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2350 | { | |
2351 | bool is_notify = false; | |
2352 | unsigned int i, count; | |
2353 | enum lttng_action_status action_status; | |
2354 | const struct lttng_action *action = | |
2355 | lttng_trigger_get_const_action(trigger); | |
2356 | enum lttng_action_type action_type; | |
2357 | ||
2358 | assert(action); | |
17182cfd | 2359 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2360 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2361 | is_notify = true; | |
2362 | goto end; | |
2363 | } else if (action_type != LTTNG_ACTION_TYPE_GROUP) { | |
2364 | goto end; | |
2365 | } | |
2366 | ||
2367 | action_status = lttng_action_group_get_count(action, &count); | |
2368 | assert(action_status == LTTNG_ACTION_STATUS_OK); | |
2369 | ||
2370 | for (i = 0; i < count; i++) { | |
2371 | const struct lttng_action *inner_action = | |
2372 | lttng_action_group_get_at_index( | |
2373 | action, i); | |
2374 | ||
17182cfd | 2375 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2376 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2377 | is_notify = true; | |
2378 | goto end; | |
2379 | } | |
2380 | } | |
2381 | ||
2382 | end: | |
2383 | return is_notify; | |
2384 | } | |
2385 | ||
242388e4 JR |
2386 | static bool trigger_name_taken(struct notification_thread_state *state, |
2387 | const struct lttng_trigger *trigger) | |
2388 | { | |
2389 | struct cds_lfht_iter iter; | |
2390 | ||
2391 | /* | |
2392 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2393 | * The match is done against the trigger name and uid. | |
2394 | */ | |
2395 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2396 | hash_trigger_by_name_uid(trigger), | |
2397 | match_trigger_by_name_uid, | |
2398 | trigger, | |
2399 | &iter); | |
2400 | return !!cds_lfht_iter_get_node(&iter); | |
2401 | } | |
2402 | ||
2403 | static | |
2404 | enum lttng_error_code generate_trigger_name( | |
2405 | struct notification_thread_state *state, | |
2406 | struct lttng_trigger *trigger, const char **name) | |
2407 | { | |
2408 | enum lttng_error_code ret_code = LTTNG_OK; | |
2409 | bool taken = false; | |
2410 | enum lttng_trigger_status status; | |
2411 | ||
2412 | do { | |
2413 | const int ret = lttng_trigger_generate_name(trigger, | |
2414 | state->trigger_id.name_offset++); | |
2415 | if (ret) { | |
2416 | /* The only reason this can fail right now. */ | |
2417 | ret_code = LTTNG_ERR_NOMEM; | |
2418 | break; | |
2419 | } | |
2420 | ||
2421 | status = lttng_trigger_get_name(trigger, name); | |
2422 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
2423 | ||
2424 | taken = trigger_name_taken(state, trigger); | |
2425 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2426 | ||
2427 | return ret_code; | |
2428 | } | |
2429 | ||
ab0ee2ca | 2430 | /* |
f2b3ef9f | 2431 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2432 | * |
1da26331 | 2433 | * The effects of this are benign since: |
ab0ee2ca | 2434 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2435 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2436 | * - The notifications will not be sent since the client's credentials |
2437 | * are checked against the channel at that moment. | |
1da26331 JG |
2438 | * |
2439 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2440 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2441 | * |
2442 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2443 | * error code. | |
ab0ee2ca JG |
2444 | */ |
2445 | static | |
2446 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2447 | struct notification_thread_state *state, |
2448 | struct lttng_trigger *trigger, | |
2449 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
2450 | { |
2451 | int ret = 0; | |
2452 | struct lttng_condition *condition; | |
2453 | struct notification_client *client; | |
2454 | struct notification_client_list *client_list = NULL; | |
2455 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
f2b3ef9f | 2456 | struct notification_client_list_element *client_list_element; |
e7c93cf9 | 2457 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; |
ab0ee2ca JG |
2458 | struct cds_lfht_node *node; |
2459 | struct cds_lfht_iter iter; | |
242388e4 | 2460 | const char* trigger_name; |
ab0ee2ca | 2461 | bool free_trigger = true; |
f2b3ef9f JG |
2462 | struct lttng_evaluation *evaluation = NULL; |
2463 | struct lttng_credentials object_creds; | |
ff588497 JR |
2464 | uid_t object_uid; |
2465 | gid_t object_gid; | |
f2b3ef9f | 2466 | enum action_executor_status executor_status; |
e6887944 JR |
2467 | const uint64_t trigger_tracer_token = |
2468 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2469 | |
2470 | rcu_read_lock(); | |
2471 | ||
e6887944 JR |
2472 | /* Set the trigger's tracer token. */ |
2473 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2474 | ||
242388e4 JR |
2475 | if (lttng_trigger_get_name(trigger, &trigger_name) == |
2476 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2477 | const enum lttng_error_code ret_code = generate_trigger_name( | |
2478 | state, trigger, &trigger_name); | |
2479 | ||
2480 | if (ret_code != LTTNG_OK) { | |
2481 | /* Fatal error. */ | |
2482 | ret = -1; | |
2483 | *cmd_result = ret_code; | |
2484 | goto error; | |
2485 | } | |
2486 | } else if (trigger_name_taken(state, trigger)) { | |
2487 | /* Not a fatal error. */ | |
2488 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2489 | ret = 0; | |
2490 | goto error; | |
2491 | } | |
2492 | ||
ab0ee2ca | 2493 | condition = lttng_trigger_get_condition(trigger); |
1da26331 JG |
2494 | assert(condition); |
2495 | ||
959e3c66 JR |
2496 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2497 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2498 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2499 | goto error; | |
1da26331 JG |
2500 | } |
2501 | ||
ab0ee2ca JG |
2502 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2503 | if (!trigger_ht_element) { | |
2504 | ret = -1; | |
2505 | goto error; | |
2506 | } | |
2507 | ||
2508 | /* Add trigger to the trigger_ht. */ | |
2509 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2510 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2511 | trigger_ht_element->trigger = trigger; |
2512 | ||
2513 | node = cds_lfht_add_unique(state->triggers_ht, | |
2514 | lttng_condition_hash(condition), | |
242388e4 JR |
2515 | match_trigger, |
2516 | trigger, | |
ab0ee2ca JG |
2517 | &trigger_ht_element->node); |
2518 | if (node != &trigger_ht_element->node) { | |
2519 | /* Not a fatal error, simply report it to the client. */ | |
2520 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2521 | goto error_free_ht_element; | |
2522 | } | |
2523 | ||
242388e4 JR |
2524 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2525 | hash_trigger_by_name_uid(trigger), | |
2526 | match_trigger_by_name_uid, | |
2527 | trigger, | |
2528 | &trigger_ht_element->node_by_name_uid); | |
2529 | if (node != &trigger_ht_element->node_by_name_uid) { | |
2530 | /* Not a fatal error, simply report it to the client. */ | |
2531 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2532 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2533 | goto error_free_ht_element; | |
2534 | } | |
2535 | ||
e7c93cf9 JR |
2536 | if (lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) { |
2537 | trigger_tokens_ht_element = zmalloc(sizeof(*trigger_tokens_ht_element)); | |
2538 | if (!trigger_tokens_ht_element) { | |
2539 | /* Fatal error. */ | |
2540 | ret = -1; | |
2541 | cds_lfht_del(state->triggers_ht, | |
2542 | &trigger_ht_element->node); | |
2543 | cds_lfht_del(state->triggers_by_name_uid_ht, | |
2544 | &trigger_ht_element->node_by_name_uid); | |
2545 | goto error_free_ht_element; | |
2546 | } | |
2547 | ||
2548 | /* Add trigger token to the trigger_tokens_ht. */ | |
2549 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2550 | trigger_tokens_ht_element->token = | |
2551 | LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2552 | trigger_tokens_ht_element->trigger = trigger; | |
2553 | ||
2554 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2555 | hash_key_u64(&trigger_tokens_ht_element->token, | |
2556 | lttng_ht_seed), | |
2557 | match_trigger_token, | |
2558 | &trigger_tokens_ht_element->token, | |
2559 | &trigger_tokens_ht_element->node); | |
2560 | if (node != &trigger_tokens_ht_element->node) { | |
2561 | /* Internal corruption, fatal error. */ | |
2562 | ret = -1; | |
2563 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2564 | cds_lfht_del(state->triggers_ht, | |
2565 | &trigger_ht_element->node); | |
2566 | cds_lfht_del(state->triggers_by_name_uid_ht, | |
2567 | &trigger_ht_element->node_by_name_uid); | |
2568 | goto error_free_ht_element; | |
2569 | } | |
2570 | } | |
2571 | ||
ab0ee2ca JG |
2572 | /* |
2573 | * Ownership of the trigger and of its wrapper was transfered to | |
e7c93cf9 | 2574 | * the triggers_ht. Same for token ht element if necessary. |
ab0ee2ca | 2575 | */ |
e7c93cf9 | 2576 | trigger_tokens_ht_element = NULL; |
ab0ee2ca JG |
2577 | trigger_ht_element = NULL; |
2578 | free_trigger = false; | |
2579 | ||
2580 | /* | |
2581 | * The rest only applies to triggers that have a "notify" action. | |
2582 | * It is not skipped as this is the only action type currently | |
2583 | * supported. | |
2584 | */ | |
f2b3ef9f JG |
2585 | if (is_trigger_action_notify(trigger)) { |
2586 | client_list = notification_client_list_create(trigger); | |
2587 | if (!client_list) { | |
2588 | ret = -1; | |
2589 | goto error_free_ht_element; | |
ab0ee2ca JG |
2590 | } |
2591 | ||
f2b3ef9f JG |
2592 | /* Build a list of clients to which this new trigger applies. */ |
2593 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
2594 | client_socket_ht_node) { | |
2595 | if (!trigger_applies_to_client(trigger, client)) { | |
2596 | continue; | |
2597 | } | |
2598 | ||
2599 | client_list_element = | |
2600 | zmalloc(sizeof(*client_list_element)); | |
2601 | if (!client_list_element) { | |
2602 | ret = -1; | |
2603 | goto error_put_client_list; | |
2604 | } | |
2605 | ||
2606 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
2607 | client_list_element->client = client; | |
2608 | cds_list_add(&client_list_element->node, | |
2609 | &client_list->list); | |
ab0ee2ca | 2610 | } |
f2b3ef9f JG |
2611 | |
2612 | /* | |
2613 | * Client list ownership transferred to the | |
2614 | * notification_trigger_clients_ht. | |
2615 | */ | |
2616 | publish_notification_client_list(state, client_list); | |
ab0ee2ca JG |
2617 | } |
2618 | ||
f82f93a1 | 2619 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2620 | case LTTNG_OBJECT_TYPE_SESSION: |
2621 | /* Add the trigger to the list if it matches a known session. */ | |
2622 | ret = bind_trigger_to_matching_session(trigger, state); | |
2623 | if (ret) { | |
505b2d90 | 2624 | goto error_put_client_list; |
ab0ee2ca | 2625 | } |
f82f93a1 | 2626 | break; |
51eab943 JG |
2627 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2628 | /* | |
2629 | * Add the trigger to list of triggers bound to the channels | |
2630 | * currently known. | |
2631 | */ | |
2632 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2633 | if (ret) { | |
505b2d90 | 2634 | goto error_put_client_list; |
ab0ee2ca | 2635 | } |
51eab943 JG |
2636 | break; |
2637 | case LTTNG_OBJECT_TYPE_NONE: | |
2638 | break; | |
2639 | default: | |
f2b3ef9f | 2640 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2641 | ret = -1; |
505b2d90 | 2642 | goto error_put_client_list; |
ab0ee2ca JG |
2643 | } |
2644 | ||
2ae99f0b | 2645 | /* |
f2b3ef9f JG |
2646 | * The new trigger's condition must be evaluated against the current |
2647 | * state. | |
2648 | * | |
2649 | * In the case of `notify` action, nothing preventing clients from | |
2650 | * subscribing to a condition before the corresponding trigger is | |
2651 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2652 | * |
2653 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2654 | * reception of a channel sample) to evaluate this new condition, but | |
2655 | * that was broken. | |
2656 | * | |
2657 | * The reason it was broken is that waiting for the next sample | |
2658 | * does not allow us to properly handle transitions for edge-triggered | |
2659 | * conditions. | |
2660 | * | |
2661 | * Consider this example: when we handle a new channel sample, we | |
2662 | * evaluate each conditions twice: once with the previous state, and | |
2663 | * again with the newest state. We then use those two results to | |
2664 | * determine whether a state change happened: a condition was false and | |
2665 | * became true. If a state change happened, we have to notify clients. | |
2666 | * | |
2667 | * Now, if a client subscribes to a given notification and registers | |
2668 | * a trigger *after* that subscription, we have to make sure the | |
2669 | * condition is evaluated at this point while considering only the | |
2670 | * current state. Otherwise, the next evaluation cycle may only see | |
2671 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2672 | * the client will never know that the condition has been met. | |
2673 | */ | |
f2b3ef9f JG |
2674 | switch (get_condition_binding_object(condition)) { |
2675 | case LTTNG_OBJECT_TYPE_SESSION: | |
2676 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2677 | &evaluation, &object_uid, |
2678 | &object_gid); | |
bc8daafb JG |
2679 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2680 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2681 | break; |
f2b3ef9f JG |
2682 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2683 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2684 | &evaluation, &object_uid, |
2685 | &object_gid); | |
bc8daafb JG |
2686 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2687 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2688 | break; |
2689 | case LTTNG_OBJECT_TYPE_NONE: | |
2690 | ret = 0; | |
242388e4 | 2691 | break; |
f2b3ef9f JG |
2692 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2693 | default: | |
2694 | ret = -1; | |
242388e4 | 2695 | break; |
f2b3ef9f JG |
2696 | } |
2697 | ||
2698 | if (ret) { | |
2699 | /* Fatal error. */ | |
2700 | goto error_put_client_list; | |
2701 | } | |
2702 | ||
2703 | DBG("Newly registered trigger's condition evaluated to %s", | |
2704 | evaluation ? "true" : "false"); | |
2705 | if (!evaluation) { | |
2706 | /* Evaluation yielded nothing. Normal exit. */ | |
2707 | ret = 0; | |
242388e4 | 2708 | goto end; |
2ae99f0b JG |
2709 | } |
2710 | ||
2711 | /* | |
f2b3ef9f JG |
2712 | * Ownership of `evaluation` transferred to the action executor |
2713 | * no matter the result. | |
2ae99f0b | 2714 | */ |
f2b3ef9f JG |
2715 | executor_status = action_executor_enqueue(state->executor, trigger, |
2716 | evaluation, &object_creds, client_list); | |
2717 | evaluation = NULL; | |
2718 | switch (executor_status) { | |
2719 | case ACTION_EXECUTOR_STATUS_OK: | |
2720 | break; | |
2721 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2722 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2723 | /* | |
2724 | * TODO Add trigger identification (name/id) when | |
2725 | * it is added to the API. | |
2726 | */ | |
2727 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2728 | ret = -1; | |
2729 | goto error_put_client_list; | |
2730 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
2731 | /* | |
2732 | * TODO Add trigger identification (name/id) when | |
2733 | * it is added to the API. | |
2734 | * | |
2735 | * Not a fatal error. | |
2736 | */ | |
2737 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2738 | ret = 0; | |
242388e4 | 2739 | goto end; |
f2b3ef9f JG |
2740 | default: |
2741 | abort(); | |
2742 | } | |
2ae99f0b | 2743 | |
242388e4 | 2744 | end: |
ab0ee2ca | 2745 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2746 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2747 | trigger_name, trigger_tracer_token); | |
505b2d90 JG |
2748 | |
2749 | error_put_client_list: | |
2750 | notification_client_list_put(client_list); | |
2751 | ||
ab0ee2ca | 2752 | error_free_ht_element: |
242388e4 JR |
2753 | if (trigger_ht_element) { |
2754 | /* Delayed removal due to RCU constraint on delete. */ | |
2755 | call_rcu(&trigger_ht_element->rcu_node, | |
2756 | free_lttng_trigger_ht_element_rcu); | |
2757 | } | |
2758 | ||
e7c93cf9 | 2759 | free(trigger_tokens_ht_element); |
ab0ee2ca JG |
2760 | error: |
2761 | if (free_trigger) { | |
ab0ee2ca JG |
2762 | lttng_trigger_destroy(trigger); |
2763 | } | |
2764 | rcu_read_unlock(); | |
2765 | return ret; | |
2766 | } | |
2767 | ||
83b934ad MD |
2768 | static |
2769 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2770 | { | |
2771 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2772 | rcu_node)); | |
2773 | } | |
2774 | ||
e7c93cf9 JR |
2775 | static |
2776 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
2777 | { | |
2778 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
2779 | rcu_node)); | |
2780 | } | |
2781 | ||
cc2295b5 | 2782 | static |
ab0ee2ca JG |
2783 | int handle_notification_thread_command_unregister_trigger( |
2784 | struct notification_thread_state *state, | |
ac16173e | 2785 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
2786 | enum lttng_error_code *_cmd_reply) |
2787 | { | |
2788 | struct cds_lfht_iter iter; | |
ed327204 | 2789 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
2790 | struct lttng_channel_trigger_list *trigger_list; |
2791 | struct notification_client_list *client_list; | |
ab0ee2ca | 2792 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 2793 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 2794 | trigger); |
ab0ee2ca JG |
2795 | enum lttng_error_code cmd_reply; |
2796 | ||
2797 | rcu_read_lock(); | |
2798 | ||
2799 | cds_lfht_lookup(state->triggers_ht, | |
2800 | lttng_condition_hash(condition), | |
242388e4 JR |
2801 | match_trigger, |
2802 | trigger, | |
ab0ee2ca JG |
2803 | &iter); |
2804 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
2805 | if (!triggers_ht_node) { | |
2806 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2807 | goto end; | |
2808 | } else { | |
2809 | cmd_reply = LTTNG_OK; | |
2810 | } | |
2811 | ||
2812 | /* Remove trigger from channel_triggers_ht. */ | |
2813 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
2814 | channel_triggers_ht_node) { | |
2815 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
2816 | ||
2817 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
2818 | &trigger_list->list, node) { | |
e8f7fa11 | 2819 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
2820 | continue; |
2821 | } | |
2822 | ||
2823 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
2824 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
2825 | /* A trigger can only appear once per channel */ |
2826 | break; | |
ab0ee2ca JG |
2827 | } |
2828 | } | |
2829 | ||
e7c93cf9 JR |
2830 | if (lttng_condition_get_type(condition) == |
2831 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) { | |
2832 | struct notification_trigger_tokens_ht_element | |
2833 | *trigger_tokens_ht_element; | |
2834 | ||
2835 | cds_lfht_for_each_entry (state->trigger_tokens_ht, &iter, | |
2836 | trigger_tokens_ht_element, node) { | |
2837 | if (!lttng_trigger_is_equal(trigger, | |
2838 | trigger_tokens_ht_element->trigger)) { | |
2839 | continue; | |
2840 | } | |
2841 | ||
2842 | DBG("[notification-thread] Removed trigger from tokens_ht"); | |
2843 | cds_lfht_del(state->trigger_tokens_ht, | |
2844 | &trigger_tokens_ht_element->node); | |
2845 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
2846 | free_notification_trigger_tokens_ht_element_rcu); | |
2847 | ||
2848 | break; | |
2849 | } | |
2850 | } | |
2851 | ||
51367634 JR |
2852 | if (is_trigger_action_notify(trigger)) { |
2853 | /* | |
2854 | * Remove and release the client list from | |
2855 | * notification_trigger_clients_ht. | |
2856 | */ | |
2857 | client_list = get_client_list_from_condition(state, condition); | |
2858 | assert(client_list); | |
ed327204 | 2859 | |
51367634 JR |
2860 | /* Put new reference and the hashtable's reference. */ |
2861 | notification_client_list_put(client_list); | |
2862 | notification_client_list_put(client_list); | |
2863 | client_list = NULL; | |
2864 | } | |
ab0ee2ca JG |
2865 | |
2866 | /* Remove trigger from triggers_ht. */ | |
2867 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
2868 | struct lttng_trigger_ht_element, node); | |
242388e4 | 2869 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2870 | cds_lfht_del(state->triggers_ht, triggers_ht_node); |
2871 | ||
7ca172c1 | 2872 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 2873 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 2874 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
2875 | end: |
2876 | rcu_read_unlock(); | |
2877 | if (_cmd_reply) { | |
2878 | *_cmd_reply = cmd_reply; | |
2879 | } | |
2880 | return 0; | |
2881 | } | |
2882 | ||
2883 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
2884 | int handle_notification_thread_command( | |
2885 | struct notification_thread_handle *handle, | |
2886 | struct notification_thread_state *state) | |
2887 | { | |
2888 | int ret; | |
2889 | uint64_t counter; | |
2890 | struct notification_thread_command *cmd; | |
2891 | ||
8abe313a | 2892 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 2893 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 2894 | sizeof(counter)); |
18aeca05 | 2895 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
2896 | goto error; |
2897 | } | |
2898 | ||
2899 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
2900 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
2901 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
2902 | cds_list_del(&cmd->cmd_list_node); |
2903 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
6900ae81 FD |
2904 | |
2905 | DBG("[notification-thread] Received `%s` command", | |
2906 | notification_command_type_str(cmd->type)); | |
ab0ee2ca JG |
2907 | switch (cmd->type) { |
2908 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
2909 | ret = handle_notification_thread_command_register_trigger(state, |
2910 | cmd->parameters.register_trigger.trigger, | |
ab0ee2ca JG |
2911 | &cmd->reply_code); |
2912 | break; | |
2913 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 2914 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
2915 | state, |
2916 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
2917 | &cmd->reply_code); |
2918 | break; | |
2919 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 2920 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
2921 | state, |
2922 | cmd->parameters.add_channel.session.name, | |
2923 | cmd->parameters.add_channel.session.uid, | |
2924 | cmd->parameters.add_channel.session.gid, | |
2925 | cmd->parameters.add_channel.channel.name, | |
2926 | cmd->parameters.add_channel.channel.domain, | |
2927 | cmd->parameters.add_channel.channel.key, | |
2928 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
2929 | &cmd->reply_code); |
2930 | break; | |
2931 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
2932 | ret = handle_notification_thread_command_remove_channel( |
2933 | state, cmd->parameters.remove_channel.key, | |
2934 | cmd->parameters.remove_channel.domain, | |
2935 | &cmd->reply_code); | |
2936 | break; | |
0ca52944 | 2937 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 2938 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 2939 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 2940 | state, |
ed327204 JG |
2941 | cmd->type, |
2942 | cmd->parameters.session_rotation.session_name, | |
2943 | cmd->parameters.session_rotation.uid, | |
2944 | cmd->parameters.session_rotation.gid, | |
2945 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
2946 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
2947 | &cmd->reply_code); |
2948 | break; | |
d02d7404 JR |
2949 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
2950 | ret = handle_notification_thread_command_add_tracer_event_source( | |
2951 | state, | |
2952 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
2953 | cmd->parameters.tracer_event_source.domain, | |
2954 | &cmd->reply_code); | |
2955 | break; | |
2956 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
2957 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2958 | state, | |
2959 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
2960 | &cmd->reply_code); | |
2961 | break; | |
fbc9f37d JR |
2962 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
2963 | { | |
2964 | struct lttng_triggers *triggers = NULL; | |
2965 | ||
2966 | ret = handle_notification_thread_command_list_triggers( | |
2967 | handle, | |
2968 | state, | |
2969 | cmd->parameters.list_triggers.uid, | |
2970 | &triggers, | |
2971 | &cmd->reply_code); | |
2972 | cmd->reply.list_triggers.triggers = triggers; | |
2973 | ret = 0; | |
2974 | break; | |
2975 | } | |
ab0ee2ca | 2976 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
2977 | cmd->reply_code = LTTNG_OK; |
2978 | ret = 1; | |
2979 | goto end; | |
f2b3ef9f JG |
2980 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
2981 | { | |
2982 | const enum client_transmission_status client_status = | |
2983 | cmd->parameters.client_communication_update | |
2984 | .status; | |
2985 | const notification_client_id client_id = | |
2986 | cmd->parameters.client_communication_update.id; | |
2987 | struct notification_client *client; | |
2988 | ||
2989 | rcu_read_lock(); | |
2990 | client = get_client_from_id(client_id, state); | |
2991 | ||
2992 | if (!client) { | |
2993 | /* | |
2994 | * Client error was probably already picked-up by the | |
2995 | * notification thread or it has disconnected | |
2996 | * gracefully while this command was queued. | |
2997 | */ | |
2998 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
2999 | client_id); | |
3000 | ret = 0; | |
3001 | } else { | |
f2b3ef9f JG |
3002 | ret = client_handle_transmission_status( |
3003 | client, client_status, state); | |
f2b3ef9f JG |
3004 | } |
3005 | rcu_read_unlock(); | |
3006 | break; | |
3007 | } | |
ab0ee2ca JG |
3008 | default: |
3009 | ERR("[notification-thread] Unknown internal command received"); | |
3010 | goto error_unlock; | |
3011 | } | |
3012 | ||
3013 | if (ret) { | |
3014 | goto error_unlock; | |
3015 | } | |
3016 | end: | |
0ab399e0 JG |
3017 | if (cmd->is_async) { |
3018 | free(cmd); | |
3019 | cmd = NULL; | |
3020 | } else { | |
3021 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3022 | } | |
ab0ee2ca JG |
3023 | return ret; |
3024 | error_unlock: | |
3025 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3026 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3027 | cmd->reply_code = LTTNG_ERR_FATAL; |
3028 | error: | |
3029 | /* Indicate a fatal error to the caller. */ | |
3030 | return -1; | |
3031 | } | |
3032 | ||
ab0ee2ca JG |
3033 | static |
3034 | int socket_set_non_blocking(int socket) | |
3035 | { | |
3036 | int ret, flags; | |
3037 | ||
3038 | /* Set the pipe as non-blocking. */ | |
3039 | ret = fcntl(socket, F_GETFL, 0); | |
3040 | if (ret == -1) { | |
3041 | PERROR("fcntl get socket flags"); | |
3042 | goto end; | |
3043 | } | |
3044 | flags = ret; | |
3045 | ||
3046 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3047 | if (ret == -1) { | |
3048 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3049 | goto end; | |
3050 | } | |
3051 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3052 | end: | |
3053 | return ret; | |
3054 | } | |
3055 | ||
3056 | static | |
14fa22f8 | 3057 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3058 | { |
3059 | int ret; | |
3060 | ||
882093ee JR |
3061 | |
3062 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3063 | |
3064 | client->communication.inbound.bytes_to_receive = | |
3065 | sizeof(struct lttng_notification_channel_message); | |
3066 | client->communication.inbound.msg_type = | |
3067 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3068 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3069 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3070 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3071 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3072 | client->communication.inbound.bytes_to_receive); |
882093ee | 3073 | |
14fa22f8 | 3074 | return ret; |
ab0ee2ca JG |
3075 | } |
3076 | ||
3077 | int handle_notification_thread_client_connect( | |
3078 | struct notification_thread_state *state) | |
3079 | { | |
3080 | int ret; | |
3081 | struct notification_client *client; | |
3082 | ||
3083 | DBG("[notification-thread] Handling new notification channel client connection"); | |
3084 | ||
3085 | client = zmalloc(sizeof(*client)); | |
3086 | if (!client) { | |
3087 | /* Fatal error. */ | |
3088 | ret = -1; | |
3089 | goto error; | |
3090 | } | |
6c24d3fd | 3091 | |
505b2d90 | 3092 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3093 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3094 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3095 | lttng_payload_init(&client->communication.inbound.payload); |
3096 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3097 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3098 | |
14fa22f8 JG |
3099 | ret = client_reset_inbound_state(client); |
3100 | if (ret) { | |
3101 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
e742b055 | 3102 | ret = 0; |
14fa22f8 JG |
3103 | goto error; |
3104 | } | |
ab0ee2ca JG |
3105 | |
3106 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3107 | if (ret < 0) { | |
3108 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
3109 | ret = 0; | |
3110 | goto error; | |
3111 | } | |
3112 | ||
3113 | client->socket = ret; | |
3114 | ||
3115 | ret = socket_set_non_blocking(client->socket); | |
3116 | if (ret) { | |
3117 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
3118 | goto error; | |
3119 | } | |
3120 | ||
3121 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3122 | if (ret < 0) { | |
3123 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
3124 | ret = 0; | |
3125 | goto error; | |
3126 | } | |
3127 | ||
3128 | ret = lttng_poll_add(&state->events, client->socket, | |
3129 | LPOLLIN | LPOLLERR | | |
3130 | LPOLLHUP | LPOLLRDHUP); | |
3131 | if (ret < 0) { | |
3132 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
3133 | ret = 0; | |
3134 | goto error; | |
3135 | } | |
3136 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
3137 | client->socket); | |
3138 | ||
ab0ee2ca JG |
3139 | rcu_read_lock(); |
3140 | cds_lfht_add(state->client_socket_ht, | |
3141 | hash_client_socket(client->socket), | |
3142 | &client->client_socket_ht_node); | |
ac1889bf JG |
3143 | cds_lfht_add(state->client_id_ht, |
3144 | hash_client_id(client->id), | |
3145 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3146 | rcu_read_unlock(); |
3147 | ||
3148 | return ret; | |
6c24d3fd | 3149 | |
ab0ee2ca JG |
3150 | error: |
3151 | notification_client_destroy(client, state); | |
3152 | return ret; | |
3153 | } | |
3154 | ||
6c24d3fd JG |
3155 | /* |
3156 | * RCU read-lock must be held by the caller. | |
3157 | * Client lock must _not_ be held by the caller. | |
3158 | */ | |
505b2d90 JG |
3159 | static |
3160 | int notification_thread_client_disconnect( | |
3161 | struct notification_client *client, | |
ab0ee2ca | 3162 | struct notification_thread_state *state) |
505b2d90 JG |
3163 | { |
3164 | int ret; | |
3165 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3166 | ||
3167 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 3168 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3169 | client->communication.active = false; |
6c24d3fd JG |
3170 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3171 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3172 | pthread_mutex_unlock(&client->lock); | |
3173 | ||
505b2d90 JG |
3174 | ret = lttng_poll_del(&state->events, client->socket); |
3175 | if (ret) { | |
3176 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
3177 | client->socket); | |
3178 | } | |
3179 | ||
505b2d90 JG |
3180 | /* Release all conditions to which the client was subscribed. */ |
3181 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3182 | &client->condition_list, node) { | |
3183 | (void) notification_thread_client_unsubscribe(client, | |
3184 | condition_list_element->condition, state, NULL); | |
3185 | } | |
3186 | ||
3187 | /* | |
3188 | * Client no longer accessible to other threads (through the | |
3189 | * client lists). | |
3190 | */ | |
3191 | notification_client_destroy(client, state); | |
3192 | return ret; | |
3193 | } | |
3194 | ||
3195 | int handle_notification_thread_client_disconnect( | |
3196 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3197 | { |
3198 | int ret = 0; | |
3199 | struct notification_client *client; | |
3200 | ||
3201 | rcu_read_lock(); | |
3202 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
3203 | client_socket); | |
3204 | client = get_client_from_socket(client_socket, state); | |
3205 | if (!client) { | |
3206 | /* Internal state corruption, fatal error. */ | |
3207 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
3208 | client_socket); | |
3209 | ret = -1; | |
3210 | goto end; | |
3211 | } | |
3212 | ||
505b2d90 | 3213 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3214 | end: |
3215 | rcu_read_unlock(); | |
3216 | return ret; | |
3217 | } | |
3218 | ||
3219 | int handle_notification_thread_client_disconnect_all( | |
3220 | struct notification_thread_state *state) | |
3221 | { | |
3222 | struct cds_lfht_iter iter; | |
3223 | struct notification_client *client; | |
3224 | bool error_encoutered = false; | |
3225 | ||
3226 | rcu_read_lock(); | |
3227 | DBG("[notification-thread] Closing all client connections"); | |
3228 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
505b2d90 | 3229 | client_socket_ht_node) { |
ab0ee2ca JG |
3230 | int ret; |
3231 | ||
505b2d90 JG |
3232 | ret = notification_thread_client_disconnect( |
3233 | client, state); | |
ab0ee2ca JG |
3234 | if (ret) { |
3235 | error_encoutered = true; | |
3236 | } | |
3237 | } | |
3238 | rcu_read_unlock(); | |
3239 | return error_encoutered ? 1 : 0; | |
3240 | } | |
3241 | ||
3242 | int handle_notification_thread_trigger_unregister_all( | |
3243 | struct notification_thread_state *state) | |
3244 | { | |
4149ace8 | 3245 | bool error_occurred = false; |
ab0ee2ca JG |
3246 | struct cds_lfht_iter iter; |
3247 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3248 | ||
763de384 | 3249 | rcu_read_lock(); |
ab0ee2ca JG |
3250 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3251 | node) { | |
3252 | int ret = handle_notification_thread_command_unregister_trigger( | |
3253 | state, trigger_ht_element->trigger, NULL); | |
3254 | if (ret) { | |
4149ace8 | 3255 | error_occurred = true; |
ab0ee2ca JG |
3256 | } |
3257 | } | |
763de384 | 3258 | rcu_read_unlock(); |
4149ace8 | 3259 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3260 | } |
3261 | ||
dd877ea6 JG |
3262 | static |
3263 | int client_handle_transmission_status( | |
3264 | struct notification_client *client, | |
3265 | enum client_transmission_status transmission_status, | |
3266 | struct notification_thread_state *state) | |
3267 | { | |
3268 | int ret = 0; | |
3269 | ||
3270 | switch (transmission_status) { | |
3271 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3272 | ret = lttng_poll_mod(&state->events, client->socket, | |
3273 | CLIENT_POLL_MASK_IN); | |
3274 | if (ret) { | |
3275 | goto end; | |
3276 | } | |
3277 | ||
dd877ea6 JG |
3278 | break; |
3279 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3280 | /* | |
3281 | * We want to be notified whenever there is buffer space | |
3282 | * available to send the rest of the payload. | |
3283 | */ | |
3284 | ret = lttng_poll_mod(&state->events, client->socket, | |
3285 | CLIENT_POLL_MASK_IN_OUT); | |
3286 | if (ret) { | |
3287 | goto end; | |
3288 | } | |
3289 | break; | |
3290 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3291 | ret = notification_thread_client_disconnect(client, state); | |
3292 | if (ret) { | |
3293 | goto end; | |
3294 | } | |
3295 | break; | |
3296 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3297 | ret = -1; | |
3298 | goto end; | |
3299 | default: | |
3300 | abort(); | |
3301 | } | |
3302 | end: | |
3303 | return ret; | |
3304 | } | |
3305 | ||
505b2d90 | 3306 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3307 | static |
dd877ea6 | 3308 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3309 | struct notification_client *client) |
ab0ee2ca JG |
3310 | { |
3311 | ssize_t ret; | |
3312 | size_t to_send_count; | |
dd877ea6 | 3313 | enum client_transmission_status status; |
882093ee JR |
3314 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3315 | &client->communication.outbound.payload, 0, -1); | |
3316 | const int fds_to_send_count = | |
3317 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3318 | |
505b2d90 JG |
3319 | ASSERT_LOCKED(client->lock); |
3320 | ||
f2b3ef9f JG |
3321 | if (!client->communication.active) { |
3322 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3323 | goto end; | |
3324 | } | |
3325 | ||
882093ee JR |
3326 | if (pv.buffer.size == 0) { |
3327 | /* | |
3328 | * If both data and fds are equal to zero, we are in an invalid | |
3329 | * state. | |
3330 | */ | |
3331 | assert(fds_to_send_count != 0); | |
3332 | goto send_fds; | |
3333 | } | |
3334 | ||
3335 | /* Send data. */ | |
3336 | to_send_count = pv.buffer.size; | |
ab0ee2ca JG |
3337 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", |
3338 | client->socket); | |
3339 | ||
3340 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3341 | pv.buffer.data, |
ab0ee2ca | 3342 | to_send_count); |
44c180ca | 3343 | if ((ret >= 0 && ret < to_send_count)) { |
ab0ee2ca JG |
3344 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", |
3345 | client->socket); | |
3346 | to_send_count -= max(ret, 0); | |
3347 | ||
6f110534 | 3348 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3349 | pv.buffer.data + |
3350 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3351 | to_send_count); |
3352 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3353 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3354 | to_send_count); |
3355 | if (ret) { | |
3356 | goto error; | |
3357 | } | |
6c24d3fd | 3358 | |
dd877ea6 | 3359 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3360 | goto end; |
ab0ee2ca | 3361 | } else if (ret < 0) { |
6c24d3fd | 3362 | /* Generic error, disable the client's communication. */ |
dd877ea6 | 3363 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3364 | client->socket); |
6c24d3fd | 3365 | client->communication.active = false; |
dd877ea6 | 3366 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3367 | goto end; |
ab0ee2ca | 3368 | } else { |
882093ee JR |
3369 | /* |
3370 | * No error and flushed the queue completely. | |
3371 | * | |
3372 | * The payload buffer size is used later to | |
3373 | * check if there is notifications queued. So albeit that the | |
3374 | * direct caller knows that the transmission is complete, we | |
3375 | * need to set the buffer size to zero. | |
3376 | */ | |
ab0ee2ca | 3377 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3378 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3379 | if (ret) { |
3380 | goto error; | |
3381 | } | |
882093ee | 3382 | } |
6c24d3fd | 3383 | |
882093ee JR |
3384 | send_fds: |
3385 | /* No fds to send, transmission is complete. */ | |
3386 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3387 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3388 | goto end; |
dd877ea6 | 3389 | } |
882093ee JR |
3390 | |
3391 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3392 | client->socket, &pv); | |
3393 | if (ret < 0) { | |
3394 | /* Generic error, disable the client's communication. */ | |
3395 | ERR("[notification-thread] Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", | |
3396 | client->socket); | |
3397 | client->communication.active = false; | |
3398 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3399 | goto end; | |
3400 | } else if (ret == 0) { | |
3401 | /* Nothing could be sent. */ | |
3402 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3403 | } else { | |
3404 | /* Fd passing is an all or nothing kind of thing. */ | |
3405 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3406 | /* | |
3407 | * The payload _fd_array count is used later to | |
3408 | * check if there is notifications queued. So although the | |
3409 | * direct caller knows that the transmission is complete, we | |
3410 | * need to clear the _fd_array for the queuing check. | |
3411 | */ | |
3412 | lttng_dynamic_pointer_array_clear( | |
3413 | &client->communication.outbound.payload | |
3414 | ._fd_handles); | |
3415 | } | |
3416 | ||
f2b3ef9f | 3417 | end: |
882093ee JR |
3418 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3419 | client->communication.outbound.queued_command_reply = false; | |
3420 | client->communication.outbound.dropped_notification = false; | |
3421 | lttng_payload_clear(&client->communication.outbound.payload); | |
3422 | } | |
3423 | ||
f2b3ef9f | 3424 | return status; |
ab0ee2ca | 3425 | error: |
f2b3ef9f | 3426 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3427 | } |
3428 | ||
882093ee JR |
3429 | static |
3430 | bool client_has_outbound_data_left( | |
3431 | const struct notification_client *client) | |
3432 | { | |
3433 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3434 | &client->communication.outbound.payload, 0, -1); | |
3435 | const bool has_data = pv.buffer.size != 0; | |
3436 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3437 | ||
3438 | return has_data || has_fds; | |
3439 | } | |
3440 | ||
6c24d3fd | 3441 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3442 | static |
3443 | int client_send_command_reply(struct notification_client *client, | |
3444 | struct notification_thread_state *state, | |
3445 | enum lttng_notification_channel_status status) | |
3446 | { | |
3447 | int ret; | |
3448 | struct lttng_notification_channel_command_reply reply = { | |
3449 | .status = (int8_t) status, | |
3450 | }; | |
3451 | struct lttng_notification_channel_message msg = { | |
3452 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3453 | .size = sizeof(reply), | |
3454 | }; | |
3455 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3456 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3457 | |
6c24d3fd JG |
3458 | memcpy(buffer, &msg, sizeof(msg)); |
3459 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
3460 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
505b2d90 | 3461 | |
6c24d3fd | 3462 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3463 | if (client->communication.outbound.queued_command_reply) { |
3464 | /* Protocol error. */ | |
6c24d3fd | 3465 | goto error_unlock; |
ab0ee2ca JG |
3466 | } |
3467 | ||
ab0ee2ca JG |
3468 | /* Enqueue buffer to outgoing queue and flush it. */ |
3469 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3470 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3471 | buffer, sizeof(buffer)); |
3472 | if (ret) { | |
6c24d3fd | 3473 | goto error_unlock; |
ab0ee2ca JG |
3474 | } |
3475 | ||
f2b3ef9f | 3476 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3477 | |
3478 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3479 | /* Queue could not be emptied. */ |
3480 | client->communication.outbound.queued_command_reply = true; | |
3481 | } | |
3482 | ||
3483 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3484 | ret = client_handle_transmission_status( |
3485 | client, transmission_status, state); | |
ab0ee2ca JG |
3486 | if (ret) { |
3487 | goto error; | |
3488 | } | |
3489 | ||
ab0ee2ca | 3490 | return 0; |
6c24d3fd JG |
3491 | error_unlock: |
3492 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3493 | error: |
3494 | return -1; | |
3495 | } | |
3496 | ||
505b2d90 JG |
3497 | static |
3498 | int client_handle_message_unknown(struct notification_client *client, | |
3499 | struct notification_thread_state *state) | |
3500 | { | |
3501 | int ret; | |
505b2d90 JG |
3502 | /* |
3503 | * Receiving message header. The function will be called again | |
3504 | * once the rest of the message as been received and can be | |
3505 | * interpreted. | |
3506 | */ | |
3507 | const struct lttng_notification_channel_message *msg; | |
3508 | ||
882093ee | 3509 | assert(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3510 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3511 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3512 | |
3513 | if (msg->size == 0 || | |
3514 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
3515 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
3516 | msg->size); | |
3517 | ret = -1; | |
3518 | goto end; | |
3519 | } | |
3520 | ||
3521 | switch (msg->type) { | |
3522 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3523 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3524 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3525 | break; | |
3526 | default: | |
3527 | ret = -1; | |
3528 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
3529 | goto end; | |
3530 | } | |
3531 | ||
3532 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3533 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3534 | client->communication.inbound.msg_type = |
3535 | (enum lttng_notification_channel_message_type) msg->type; | |
3536 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3537 | &client->communication.inbound.payload.buffer, msg->size); |
3538 | ||
3539 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3540 | msg = NULL; | |
505b2d90 | 3541 | end: |
505b2d90 JG |
3542 | return ret; |
3543 | } | |
3544 | ||
3545 | static | |
3546 | int client_handle_message_handshake(struct notification_client *client, | |
3547 | struct notification_thread_state *state) | |
3548 | { | |
3549 | int ret; | |
3550 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3551 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3552 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3553 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3554 | }; | |
3555 | const struct lttng_notification_channel_message msg_header = { | |
3556 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3557 | .size = sizeof(handshake_reply), | |
3558 | }; | |
3559 | enum lttng_notification_channel_status status = | |
3560 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3561 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3562 | |
3563 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3564 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3565 | sizeof(handshake_reply)); | |
3566 | ||
3567 | handshake_client = | |
3568 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3569 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3570 | .data; |
3571 | client->major = handshake_client->major; | |
3572 | client->minor = handshake_client->minor; | |
3573 | if (!client->communication.inbound.creds_received) { | |
3574 | ERR("[notification-thread] No credentials received from client"); | |
3575 | ret = -1; | |
3576 | goto end; | |
3577 | } | |
3578 | ||
3579 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3580 | &client->communication.inbound.creds); | |
3581 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3582 | &client->communication.inbound.creds); | |
3583 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
3584 | client->uid, client->gid, (int) client->major, | |
3585 | (int) client->minor); | |
3586 | ||
3587 | if (handshake_client->major != | |
3588 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3589 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3590 | } | |
3591 | ||
6c24d3fd JG |
3592 | pthread_mutex_lock(&client->lock); |
3593 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3594 | ret = lttng_dynamic_buffer_append( |
882093ee | 3595 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3596 | sizeof(send_buffer)); |
3597 | if (ret) { | |
3598 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
6c24d3fd | 3599 | goto end_unlock; |
505b2d90 JG |
3600 | } |
3601 | ||
3602 | client->validated = true; | |
3603 | client->communication.active = true; | |
6c24d3fd | 3604 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3605 | |
6c24d3fd JG |
3606 | /* Set reception state to receive the next message header. */ |
3607 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3608 | if (ret) { |
6c24d3fd | 3609 | ERR("[notification-thread] Failed to reset client communication's inbound state"); |
505b2d90 JG |
3610 | goto end; |
3611 | } | |
3612 | ||
6c24d3fd | 3613 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3614 | ret = client_send_command_reply(client, state, status); |
3615 | if (ret) { | |
3616 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3617 | goto end; | |
3618 | } | |
3619 | ||
6c24d3fd JG |
3620 | goto end; |
3621 | end_unlock: | |
505b2d90 | 3622 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3623 | end: |
505b2d90 JG |
3624 | return ret; |
3625 | } | |
3626 | ||
3627 | static | |
3628 | int client_handle_message_subscription( | |
3629 | struct notification_client *client, | |
3630 | enum lttng_notification_channel_message_type msg_type, | |
3631 | struct notification_thread_state *state) | |
3632 | { | |
3633 | int ret; | |
3634 | struct lttng_condition *condition; | |
3635 | enum lttng_notification_channel_status status = | |
3636 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3637 | struct lttng_payload_view condition_view = | |
882093ee JR |
3638 | lttng_payload_view_from_payload( |
3639 | &client->communication.inbound.payload, | |
505b2d90 JG |
3640 | 0, -1); |
3641 | size_t expected_condition_size; | |
3642 | ||
6c24d3fd JG |
3643 | /* |
3644 | * No need to lock client to sample the inbound state as the only | |
3645 | * other thread accessing clients (action executor) only uses the | |
3646 | * outbound state. | |
3647 | */ | |
882093ee | 3648 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3649 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3650 | if (ret != expected_condition_size) { | |
3651 | ERR("[notification-thread] Malformed condition received from client"); | |
3652 | goto end; | |
3653 | } | |
3654 | ||
3655 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
3656 | ret = notification_thread_client_subscribe( | |
3657 | client, condition, state, &status); | |
3658 | } else { | |
3659 | ret = notification_thread_client_unsubscribe( | |
3660 | client, condition, state, &status); | |
3661 | } | |
505b2d90 | 3662 | |
505b2d90 | 3663 | if (ret) { |
6c24d3fd | 3664 | goto end; |
505b2d90 JG |
3665 | } |
3666 | ||
3667 | /* Set reception state to receive the next message header. */ | |
3668 | ret = client_reset_inbound_state(client); | |
3669 | if (ret) { | |
3670 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
6c24d3fd JG |
3671 | goto end; |
3672 | } | |
3673 | ||
3674 | ret = client_send_command_reply(client, state, status); | |
3675 | if (ret) { | |
3676 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3677 | goto end; | |
505b2d90 JG |
3678 | } |
3679 | ||
505b2d90 JG |
3680 | end: |
3681 | return ret; | |
3682 | } | |
3683 | ||
ab0ee2ca JG |
3684 | static |
3685 | int client_dispatch_message(struct notification_client *client, | |
3686 | struct notification_thread_state *state) | |
3687 | { | |
3688 | int ret = 0; | |
3689 | ||
3690 | if (client->communication.inbound.msg_type != | |
3691 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3692 | client->communication.inbound.msg_type != | |
3693 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3694 | !client->validated) { | |
3695 | WARN("[notification-thread] client attempted a command before handshake"); | |
3696 | ret = -1; | |
3697 | goto end; | |
3698 | } | |
3699 | ||
3700 | switch (client->communication.inbound.msg_type) { | |
3701 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3702 | { | |
505b2d90 | 3703 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3704 | break; |
3705 | } | |
3706 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3707 | { | |
505b2d90 | 3708 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3709 | break; |
3710 | } | |
3711 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3712 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3713 | { | |
505b2d90 JG |
3714 | ret = client_handle_message_subscription(client, |
3715 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3716 | break; |
3717 | } | |
3718 | default: | |
3719 | abort(); | |
3720 | } | |
3721 | end: | |
3722 | return ret; | |
3723 | } | |
3724 | ||
3725 | /* Incoming data from client. */ | |
3726 | int handle_notification_thread_client_in( | |
3727 | struct notification_thread_state *state, int socket) | |
3728 | { | |
14fa22f8 | 3729 | int ret = 0; |
ab0ee2ca JG |
3730 | struct notification_client *client; |
3731 | ssize_t recv_ret; | |
3732 | size_t offset; | |
3733 | ||
98b5ff34 | 3734 | rcu_read_lock(); |
ab0ee2ca JG |
3735 | client = get_client_from_socket(socket, state); |
3736 | if (!client) { | |
3737 | /* Internal error, abort. */ | |
3738 | ret = -1; | |
3739 | goto end; | |
3740 | } | |
3741 | ||
882093ee | 3742 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3743 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3744 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3745 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3746 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3747 | client->communication.inbound.bytes_to_receive, |
3748 | &client->communication.inbound.creds); | |
3749 | if (recv_ret > 0) { | |
01ea340e | 3750 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3751 | client->communication.inbound.creds_received = true; |
3752 | } | |
3753 | } else { | |
3754 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 3755 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3756 | client->communication.inbound.bytes_to_receive); |
3757 | } | |
505b2d90 JG |
3758 | if (recv_ret >= 0) { |
3759 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
3760 | } else { |
3761 | goto error_disconnect_client; | |
505b2d90 | 3762 | } |
6c24d3fd | 3763 | |
882093ee JR |
3764 | if (client->communication.inbound.bytes_to_receive != 0) { |
3765 | /* Message incomplete wait for more data. */ | |
3766 | ret = 0; | |
3767 | goto end; | |
ab0ee2ca JG |
3768 | } |
3769 | ||
882093ee JR |
3770 | assert(client->communication.inbound.bytes_to_receive == 0); |
3771 | ||
3772 | /* Receive fds. */ | |
3773 | if (client->communication.inbound.fds_to_receive != 0) { | |
3774 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
3775 | client->socket, | |
3776 | client->communication.inbound.fds_to_receive, | |
3777 | &client->communication.inbound.payload); | |
3778 | if (ret > 0) { | |
ab0ee2ca | 3779 | /* |
882093ee JR |
3780 | * Fds received. non blocking fds passing is all |
3781 | * or nothing. | |
ab0ee2ca | 3782 | */ |
882093ee JR |
3783 | ssize_t expected_size; |
3784 | ||
3785 | expected_size = sizeof(int) * | |
3786 | client->communication.inbound | |
3787 | .fds_to_receive; | |
3788 | assert(ret == expected_size); | |
3789 | client->communication.inbound.fds_to_receive = 0; | |
3790 | } else if (ret == 0) { | |
3791 | /* Received nothing. */ | |
3792 | ret = 0; | |
3793 | goto end; | |
3794 | } else { | |
ab0ee2ca JG |
3795 | goto error_disconnect_client; |
3796 | } | |
ab0ee2ca | 3797 | } |
882093ee JR |
3798 | |
3799 | /* At this point the message is complete.*/ | |
3800 | assert(client->communication.inbound.bytes_to_receive == 0 && | |
3801 | client->communication.inbound.fds_to_receive == 0); | |
3802 | ret = client_dispatch_message(client, state); | |
3803 | if (ret) { | |
3804 | /* | |
3805 | * Only returns an error if this client must be | |
3806 | * disconnected. | |
3807 | */ | |
3808 | goto error_disconnect_client; | |
3809 | } | |
3810 | ||
ab0ee2ca | 3811 | end: |
98b5ff34 | 3812 | rcu_read_unlock(); |
ab0ee2ca | 3813 | return ret; |
882093ee | 3814 | |
ab0ee2ca | 3815 | error_disconnect_client: |
505b2d90 | 3816 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 3817 | goto end; |
ab0ee2ca JG |
3818 | } |
3819 | ||
3820 | /* Client ready to receive outgoing data. */ | |
3821 | int handle_notification_thread_client_out( | |
3822 | struct notification_thread_state *state, int socket) | |
3823 | { | |
3824 | int ret; | |
3825 | struct notification_client *client; | |
f2b3ef9f | 3826 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3827 | |
98b5ff34 | 3828 | rcu_read_lock(); |
ab0ee2ca JG |
3829 | client = get_client_from_socket(socket, state); |
3830 | if (!client) { | |
3831 | /* Internal error, abort. */ | |
3832 | ret = -1; | |
3833 | goto end; | |
3834 | } | |
3835 | ||
505b2d90 | 3836 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 3837 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
3838 | pthread_mutex_unlock(&client->lock); |
3839 | ||
f2b3ef9f JG |
3840 | ret = client_handle_transmission_status( |
3841 | client, transmission_status, state); | |
ab0ee2ca JG |
3842 | if (ret) { |
3843 | goto end; | |
3844 | } | |
3845 | end: | |
98b5ff34 | 3846 | rcu_read_unlock(); |
ab0ee2ca JG |
3847 | return ret; |
3848 | } | |
3849 | ||
3850 | static | |
e8360425 JD |
3851 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
3852 | const struct channel_state_sample *sample, | |
3853 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
3854 | { |
3855 | bool result = false; | |
3856 | uint64_t threshold; | |
3857 | enum lttng_condition_type condition_type; | |
e8360425 | 3858 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
3859 | condition, struct lttng_condition_buffer_usage, |
3860 | parent); | |
3861 | ||
ab0ee2ca JG |
3862 | if (use_condition->threshold_bytes.set) { |
3863 | threshold = use_condition->threshold_bytes.value; | |
3864 | } else { | |
3865 | /* | |
3866 | * Threshold was expressed as a ratio. | |
3867 | * | |
3868 | * TODO the threshold (in bytes) of conditions expressed | |
3869 | * as a ratio of total buffer size could be cached to | |
3870 | * forego this double-multiplication or it could be performed | |
3871 | * as fixed-point math. | |
3872 | * | |
d49487dc | 3873 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
3874 | * condition applies to multiple channels (i.e. don't assume |
3875 | * that all channels matching my_chann* have the same size...) | |
3876 | */ | |
3877 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
3878 | (double) buffer_capacity); | |
3879 | } | |
3880 | ||
3881 | condition_type = lttng_condition_get_type(condition); | |
3882 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
3883 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3884 | threshold, sample->highest_usage); | |
3885 | ||
3886 | /* | |
3887 | * The low condition should only be triggered once _all_ of the | |
3888 | * streams in a channel have gone below the "low" threshold. | |
3889 | */ | |
3890 | if (sample->highest_usage <= threshold) { | |
3891 | result = true; | |
3892 | } | |
3893 | } else { | |
3894 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3895 | threshold, sample->highest_usage); | |
3896 | ||
3897 | /* | |
3898 | * For high buffer usage scenarios, we want to trigger whenever | |
3899 | * _any_ of the streams has reached the "high" threshold. | |
3900 | */ | |
3901 | if (sample->highest_usage >= threshold) { | |
3902 | result = true; | |
3903 | } | |
3904 | } | |
e8360425 | 3905 | |
ab0ee2ca JG |
3906 | return result; |
3907 | } | |
3908 | ||
3909 | static | |
e8360425 JD |
3910 | bool evaluate_session_consumed_size_condition( |
3911 | const struct lttng_condition *condition, | |
3912 | uint64_t session_consumed_size) | |
3913 | { | |
3914 | uint64_t threshold; | |
3915 | const struct lttng_condition_session_consumed_size *size_condition = | |
3916 | container_of(condition, | |
3917 | struct lttng_condition_session_consumed_size, | |
3918 | parent); | |
3919 | ||
3920 | threshold = size_condition->consumed_threshold_bytes.value; | |
3921 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
3922 | threshold, session_consumed_size); | |
3923 | return session_consumed_size >= threshold; | |
3924 | } | |
3925 | ||
3926 | static | |
ed327204 | 3927 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 3928 | struct lttng_evaluation **evaluation, |
e8360425 JD |
3929 | const struct notification_thread_state *state, |
3930 | const struct channel_state_sample *previous_sample, | |
3931 | const struct channel_state_sample *latest_sample, | |
3932 | uint64_t previous_session_consumed_total, | |
3933 | uint64_t latest_session_consumed_total, | |
3934 | struct channel_info *channel_info) | |
ab0ee2ca JG |
3935 | { |
3936 | int ret = 0; | |
3937 | enum lttng_condition_type condition_type; | |
e8360425 JD |
3938 | const bool previous_sample_available = !!previous_sample; |
3939 | bool previous_sample_result = false; | |
ab0ee2ca JG |
3940 | bool latest_sample_result; |
3941 | ||
3942 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 3943 | |
e8360425 JD |
3944 | switch (condition_type) { |
3945 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3946 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
3947 | if (caa_likely(previous_sample_available)) { | |
3948 | previous_sample_result = | |
3949 | evaluate_buffer_usage_condition(condition, | |
3950 | previous_sample, channel_info->capacity); | |
3951 | } | |
3952 | latest_sample_result = evaluate_buffer_usage_condition( | |
3953 | condition, latest_sample, | |
3954 | channel_info->capacity); | |
3955 | break; | |
3956 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3957 | if (caa_likely(previous_sample_available)) { | |
3958 | previous_sample_result = | |
3959 | evaluate_session_consumed_size_condition( | |
3960 | condition, | |
3961 | previous_session_consumed_total); | |
3962 | } | |
3963 | latest_sample_result = | |
3964 | evaluate_session_consumed_size_condition( | |
3965 | condition, | |
3966 | latest_session_consumed_total); | |
3967 | break; | |
3968 | default: | |
3969 | /* Unknown condition type; internal error. */ | |
3970 | abort(); | |
3971 | } | |
ab0ee2ca JG |
3972 | |
3973 | if (!latest_sample_result || | |
3974 | (previous_sample_result == latest_sample_result)) { | |
3975 | /* | |
3976 | * Only trigger on a condition evaluation transition. | |
3977 | * | |
3978 | * NOTE: This edge-triggered logic may not be appropriate for | |
3979 | * future condition types. | |
3980 | */ | |
3981 | goto end; | |
3982 | } | |
3983 | ||
e8360425 JD |
3984 | if (!evaluation || !latest_sample_result) { |
3985 | goto end; | |
3986 | } | |
3987 | ||
3988 | switch (condition_type) { | |
3989 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3990 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
3991 | *evaluation = lttng_evaluation_buffer_usage_create( |
3992 | condition_type, | |
3993 | latest_sample->highest_usage, | |
e8360425 JD |
3994 | channel_info->capacity); |
3995 | break; | |
3996 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3997 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
3998 | latest_session_consumed_total); |
3999 | break; | |
4000 | default: | |
4001 | abort(); | |
4002 | } | |
4003 | ||
4004 | if (!*evaluation) { | |
4005 | ret = -1; | |
4006 | goto end; | |
ab0ee2ca JG |
4007 | } |
4008 | end: | |
4009 | return ret; | |
4010 | } | |
4011 | ||
4012 | static | |
f2b3ef9f | 4013 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4014 | { |
f2b3ef9f JG |
4015 | int ret = 0; |
4016 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 4017 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
4018 | }; |
4019 | ||
505b2d90 JG |
4020 | ASSERT_LOCKED(client->lock); |
4021 | ||
f2b3ef9f JG |
4022 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4023 | client->socket); | |
4024 | if (client->communication.outbound.dropped_notification) { | |
4025 | /* | |
4026 | * The client already has a "notification dropped" message | |
4027 | * in its outgoing queue. Nothing to do since all | |
4028 | * of those messages are coalesced. | |
4029 | */ | |
4030 | goto end; | |
4031 | } | |
4032 | ||
4033 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4034 | ret = lttng_dynamic_buffer_append( |
882093ee | 4035 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4036 | sizeof(msg)); |
f2b3ef9f JG |
4037 | if (ret) { |
4038 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4039 | client->socket); | |
4040 | } | |
4041 | end: | |
ab0ee2ca JG |
4042 | return ret; |
4043 | } | |
4044 | ||
f2b3ef9f JG |
4045 | static int client_handle_transmission_status_wrapper( |
4046 | struct notification_client *client, | |
4047 | enum client_transmission_status status, | |
4048 | void *user_data) | |
4049 | { | |
4050 | return client_handle_transmission_status(client, status, | |
4051 | (struct notification_thread_state *) user_data); | |
4052 | } | |
4053 | ||
4054 | static | |
4055 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4056 | const struct lttng_evaluation *evaluation, | |
4057 | struct notification_client_list* client_list, | |
4058 | struct notification_thread_state *state, | |
4059 | uid_t object_uid, gid_t object_gid) | |
4060 | { | |
ff588497 JR |
4061 | const struct lttng_credentials creds = { |
4062 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4063 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4064 | }; | |
4065 | ||
f2b3ef9f JG |
4066 | return notification_client_list_send_evaluation(client_list, |
4067 | lttng_trigger_get_const_condition(trigger), evaluation, | |
4068 | lttng_trigger_get_credentials(trigger), | |
ff588497 | 4069 | &creds, |
f2b3ef9f JG |
4070 | client_handle_transmission_status_wrapper, state); |
4071 | } | |
4072 | ||
f37d0f86 JG |
4073 | /* |
4074 | * Permission checks relative to notification channel clients are performed | |
4075 | * here. Notice how object, client, and trigger credentials are involved in | |
4076 | * this check. | |
4077 | * | |
4078 | * The `object` credentials are the credentials associated with the "subject" | |
4079 | * of a condition. For instance, a `rotation completed` condition applies | |
4080 | * to a session. When that condition is met, it will produce an evaluation | |
4081 | * against a session. Hence, in this case, the `object` credentials are the | |
4082 | * credentials of the "subject" session. | |
4083 | * | |
4084 | * The `trigger` credentials are the credentials of the user that registered the | |
4085 | * trigger. | |
4086 | * | |
4087 | * The `client` credentials are the credentials of the user that created a given | |
4088 | * notification channel. | |
4089 | * | |
4090 | * In terms of visibility, it is expected that non-privilieged users can only | |
4091 | * register triggers against "their" objects (their own sessions and | |
4092 | * applications they are allowed to interact with). They can then open a | |
4093 | * notification channel and subscribe to notifications associated with those | |
4094 | * triggers. | |
4095 | * | |
4096 | * As for privilieged users, they can register triggers against the objects of | |
4097 | * other users. They can then subscribe to the notifications associated to their | |
4098 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4099 | * triggers owned by other users; they must create their own triggers. | |
4100 | * | |
4101 | * This is more a concern of usability than security. It would be difficult for | |
4102 | * a root user reliably subscribe to a specific set of conditions without | |
4103 | * interference from external users (those could, for instance, unregister | |
4104 | * their triggers). | |
4105 | */ | |
f2b3ef9f JG |
4106 | LTTNG_HIDDEN |
4107 | int notification_client_list_send_evaluation( | |
4108 | struct notification_client_list *client_list, | |
4109 | const struct lttng_condition *condition, | |
9b63a4aa | 4110 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4111 | const struct lttng_credentials *trigger_creds, |
4112 | const struct lttng_credentials *source_object_creds, | |
4113 | report_client_transmission_result_cb client_report, | |
4114 | void *user_data) | |
ab0ee2ca JG |
4115 | { |
4116 | int ret = 0; | |
c0a66c84 | 4117 | struct lttng_payload msg_payload; |
ab0ee2ca | 4118 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4119 | const struct lttng_notification notification = { |
f2b3ef9f | 4120 | .condition = (struct lttng_condition *) condition, |
9b63a4aa JG |
4121 | .evaluation = (struct lttng_evaluation *) evaluation, |
4122 | }; | |
3647288f JG |
4123 | struct lttng_notification_channel_message msg_header = { |
4124 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
4125 | }; | |
ab0ee2ca | 4126 | |
c0a66c84 | 4127 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4128 | |
c0a66c84 | 4129 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4130 | sizeof(msg_header)); |
ab0ee2ca JG |
4131 | if (ret) { |
4132 | goto end; | |
4133 | } | |
4134 | ||
c0a66c84 | 4135 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4136 | if (ret) { |
ab0ee2ca JG |
4137 | ERR("[notification-thread] Failed to serialize notification"); |
4138 | ret = -1; | |
4139 | goto end; | |
4140 | } | |
4141 | ||
3647288f | 4142 | /* Update payload size. */ |
505b2d90 JG |
4143 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4144 | ->size = (uint32_t)( | |
4145 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4146 | |
882093ee JR |
4147 | /* Update the payload number of fds. */ |
4148 | { | |
4149 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4150 | &msg_payload, 0, -1); | |
4151 | ||
4152 | ((struct lttng_notification_channel_message *) | |
4153 | msg_payload.buffer.data)->fds = (uint32_t) | |
4154 | lttng_payload_view_get_fd_handle_count(&pv); | |
4155 | } | |
4156 | ||
505b2d90 | 4157 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
4158 | cds_list_for_each_entry_safe(client_list_element, tmp, |
4159 | &client_list->list, node) { | |
f2b3ef9f | 4160 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4161 | struct notification_client *client = |
4162 | client_list_element->client; | |
4163 | ||
505b2d90 JG |
4164 | ret = 0; |
4165 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4166 | if (!client->communication.active) { |
4167 | /* | |
4168 | * Skip inactive client (protocol error or | |
4169 | * disconnecting). | |
4170 | */ | |
4171 | DBG("Skipping client at it is marked as inactive"); | |
4172 | goto skip_client; | |
4173 | } | |
4174 | ||
f2b3ef9f | 4175 | if (source_object_creds) { |
ff588497 JR |
4176 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4177 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4178 | client->uid != 0) { |
4179 | /* | |
4180 | * Client is not allowed to monitor this | |
4181 | * object. | |
4182 | */ | |
4183 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
6c24d3fd | 4184 | goto skip_client; |
f2b3ef9f | 4185 | } |
90843f49 JR |
4186 | } |
4187 | ||
ff588497 | 4188 | if (client->uid != lttng_credentials_get_uid(trigger_creds) && client->gid != lttng_credentials_get_gid(trigger_creds)) { |
90843f49 | 4189 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4190 | goto skip_client; |
ab0ee2ca JG |
4191 | } |
4192 | ||
4193 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
c0a66c84 | 4194 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4195 | |
4196 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4197 | /* |
4198 | * Outgoing data is already buffered for this client; | |
4199 | * drop the notification and enqueue a "dropped | |
4200 | * notification" message if this is the first dropped | |
4201 | * notification since the socket spilled-over to the | |
4202 | * queue. | |
4203 | */ | |
f2b3ef9f JG |
4204 | ret = client_notification_overflow(client); |
4205 | if (ret) { | |
6c24d3fd JG |
4206 | /* Fatal error. */ |
4207 | goto skip_client; | |
ab0ee2ca | 4208 | } |
ab0ee2ca JG |
4209 | } |
4210 | ||
882093ee | 4211 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4212 | if (ret) { |
6c24d3fd JG |
4213 | /* Fatal error. */ |
4214 | goto skip_client; | |
ab0ee2ca JG |
4215 | } |
4216 | ||
f2b3ef9f | 4217 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4218 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4219 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4220 | if (ret) { |
6c24d3fd JG |
4221 | /* Fatal error. */ |
4222 | goto end_unlock_list; | |
505b2d90 | 4223 | } |
6c24d3fd JG |
4224 | |
4225 | continue; | |
4226 | ||
4227 | skip_client: | |
505b2d90 JG |
4228 | pthread_mutex_unlock(&client->lock); |
4229 | if (ret) { | |
6c24d3fd | 4230 | /* Fatal error. */ |
505b2d90 | 4231 | goto end_unlock_list; |
ab0ee2ca JG |
4232 | } |
4233 | } | |
4234 | ret = 0; | |
505b2d90 JG |
4235 | |
4236 | end_unlock_list: | |
4237 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4238 | end: |
c0a66c84 | 4239 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4240 | return ret; |
4241 | } | |
4242 | ||
8b524060 FD |
4243 | static |
4244 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4245 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4246 | { |
4247 | int ret; | |
b9a8d78f FD |
4248 | uint64_t token; |
4249 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4250 | char *capture_buffer = NULL; |
4251 | size_t capture_buffer_size; | |
94078603 JR |
4252 | void *reception_buffer; |
4253 | size_t reception_size; | |
4254 | ||
fc4b93fa | 4255 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
b9a8d78f | 4256 | struct lttng_kernel_event_notifier_notification kernel_notification; |
94078603 | 4257 | |
b9a8d78f | 4258 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4259 | switch(domain) { |
4260 | case LTTNG_DOMAIN_UST: | |
4261 | reception_buffer = (void *) &ust_notification; | |
4262 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4263 | break; |
4264 | case LTTNG_DOMAIN_KERNEL: | |
4265 | reception_buffer = (void *) &kernel_notification; | |
4266 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4267 | break; |
4268 | default: | |
4269 | abort(); | |
4270 | } | |
4271 | ||
4272 | /* | |
4273 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4274 | * ensuring that read/write of tracer notifications are atomic. | |
4275 | */ | |
4276 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4277 | reception_size); | |
4278 | if (ret != reception_size) { | |
4279 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4280 | notification_pipe_read_fd, reception_size, ret); | |
4281 | ret = -1; | |
4282 | goto end; | |
4283 | } | |
4284 | ||
4285 | switch(domain) { | |
4286 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4287 | token = ust_notification.token; |
82b3cbf4 | 4288 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4289 | break; |
4290 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4291 | token = kernel_notification.token; |
82b3cbf4 | 4292 | capture_buffer_size = 0; |
94078603 JR |
4293 | break; |
4294 | default: | |
4295 | abort(); | |
4296 | } | |
4297 | ||
82b3cbf4 JR |
4298 | if (capture_buffer_size == 0) { |
4299 | capture_buffer = NULL; | |
4300 | goto skip_capture; | |
4301 | } | |
4302 | ||
4303 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
4304 | ERR("[notification-thread] Event notifier has a capture payload size which exceeds the maximum allowed size: capture_payload_size = %zu bytes, max allowed size = %d bytes", | |
4305 | capture_buffer_size, MAX_CAPTURE_SIZE); | |
4306 | goto end; | |
4307 | } | |
4308 | ||
4309 | capture_buffer = zmalloc(capture_buffer_size); | |
4310 | if (!capture_buffer) { | |
4311 | ERR("[notification-thread] Failed to allocate capture buffer"); | |
4312 | goto end; | |
4313 | } | |
4314 | ||
4315 | /* Fetch additional payload (capture). */ | |
4316 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4317 | if (ret != capture_buffer_size) { | |
4318 | ERR("[notification-thread] Failed to read from event source pipe (fd = %i)", | |
4319 | notification_pipe_read_fd); | |
4320 | goto end; | |
4321 | } | |
4322 | ||
4323 | skip_capture: | |
4324 | notification = lttng_event_notifier_notification_create(token, domain, | |
4325 | capture_buffer, capture_buffer_size); | |
4326 | if (notification == NULL) { | |
4327 | goto end; | |
4328 | } | |
4329 | ||
4330 | /* | |
4331 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4332 | */ | |
4333 | capture_buffer = NULL; | |
4334 | ||
b9a8d78f | 4335 | end: |
82b3cbf4 | 4336 | free(capture_buffer); |
b9a8d78f FD |
4337 | return notification; |
4338 | } | |
4339 | ||
8b524060 FD |
4340 | static |
4341 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4342 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4343 | { |
b9a8d78f FD |
4344 | struct cds_lfht_node *node; |
4345 | struct cds_lfht_iter iter; | |
4346 | struct notification_trigger_tokens_ht_element *element; | |
8b524060 | 4347 | enum lttng_trigger_status trigger_status; |
b9a8d78f | 4348 | struct lttng_evaluation *evaluation = NULL; |
b9a8d78f FD |
4349 | enum action_executor_status executor_status; |
4350 | struct notification_client_list *client_list = NULL; | |
4351 | const char *trigger_name; | |
8b524060 | 4352 | int ret; |
b9a8d78f | 4353 | |
94078603 JR |
4354 | /* Find triggers associated with this token. */ |
4355 | rcu_read_lock(); | |
4356 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4357 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4358 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4359 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4360 | if (caa_unlikely(!node)) { |
94078603 | 4361 | /* |
f1446131 JR |
4362 | * This is not an error, slow consumption of the tracer |
4363 | * notifications can lead to situations where a trigger is | |
4364 | * removed but we still get tracer notifications matching a | |
4365 | * trigger that no longer exists. | |
94078603 JR |
4366 | */ |
4367 | ret = 0; | |
4368 | goto end_unlock; | |
4369 | } | |
4370 | ||
4371 | element = caa_container_of(node, | |
4372 | struct notification_trigger_tokens_ht_element, | |
4373 | node); | |
4374 | ||
f1446131 JR |
4375 | if (!lttng_trigger_should_fire(element->trigger)) { |
4376 | ret = 0; | |
4377 | goto end_unlock; | |
4378 | } | |
94078603 | 4379 | |
f1446131 | 4380 | lttng_trigger_fire(element->trigger); |
94078603 | 4381 | |
b9a8d78f FD |
4382 | trigger_status = lttng_trigger_get_name(element->trigger, &trigger_name); |
4383 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
4384 | ||
4385 | evaluation = lttng_evaluation_event_rule_create( | |
4386 | trigger_name); | |
f1446131 | 4387 | if (evaluation == NULL) { |
b9a8d78f | 4388 | ERR("[notification-thread] Failed to create event rule hit evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4389 | ret = -1; |
4390 | goto end_unlock; | |
4391 | } | |
4392 | ||
4393 | client_list = get_client_list_from_condition(state, | |
4394 | lttng_trigger_get_const_condition(element->trigger)); | |
4395 | executor_status = action_executor_enqueue(state->executor, | |
4396 | element->trigger, evaluation, NULL, client_list); | |
4397 | switch (executor_status) { | |
4398 | case ACTION_EXECUTOR_STATUS_OK: | |
4399 | ret = 0; | |
4400 | break; | |
4401 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4402 | { | |
4403 | struct notification_client_list_element *client_list_element, | |
4404 | *tmp; | |
4405 | ||
4406 | /* | |
4407 | * Not a fatal error; this is expected and simply means the | |
4408 | * executor has too much work queued already. | |
4409 | */ | |
4410 | ret = 0; | |
4411 | ||
4412 | /* No clients subscribed to notifications for this trigger. */ | |
4413 | if (!client_list) { | |
4414 | break; | |
4415 | } | |
4416 | ||
4417 | /* Warn clients that a notification (or more) was dropped. */ | |
4418 | pthread_mutex_lock(&client_list->lock); | |
4419 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
4420 | &client_list->list, node) { | |
4421 | enum client_transmission_status transmission_status; | |
4422 | struct notification_client *client = | |
4423 | client_list_element->client; | |
4424 | ||
4425 | pthread_mutex_lock(&client->lock); | |
4426 | ret = client_notification_overflow(client); | |
4427 | if (ret) { | |
4428 | /* Fatal error. */ | |
4429 | goto next_client; | |
4430 | } | |
4431 | ||
4432 | transmission_status = | |
4433 | client_flush_outgoing_queue(client); | |
4434 | ret = client_handle_transmission_status( | |
4435 | client, transmission_status, state); | |
4436 | if (ret) { | |
4437 | /* Fatal error. */ | |
4438 | goto next_client; | |
4439 | } | |
4440 | next_client: | |
4441 | pthread_mutex_unlock(&client->lock); | |
4442 | if (ret) { | |
4443 | break; | |
4444 | } | |
4445 | } | |
4446 | ||
4447 | pthread_mutex_unlock(&client_list->lock); | |
4448 | break; | |
4449 | } | |
4450 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4451 | /* Fatal error, shut down everything. */ | |
4452 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4453 | ret = -1; | |
4454 | goto end_unlock; | |
4455 | default: | |
4456 | /* Unhandled error. */ | |
4457 | abort(); | |
4458 | } | |
94078603 JR |
4459 | |
4460 | end_unlock: | |
f1446131 | 4461 | notification_client_list_put(client_list); |
94078603 | 4462 | rcu_read_unlock(); |
8b524060 FD |
4463 | return ret; |
4464 | } | |
4465 | ||
4466 | static | |
4467 | int handle_one_event_notifier_notification( | |
4468 | struct notification_thread_state *state, | |
4469 | int pipe, enum lttng_domain_type domain) | |
4470 | { | |
82b3cbf4 | 4471 | int ret = 0; |
8b524060 FD |
4472 | struct lttng_event_notifier_notification *notification = NULL; |
4473 | ||
4474 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4475 | if (notification == NULL) { | |
82b3cbf4 | 4476 | /* Reception failed, don't consider it fatal. */ |
8b524060 FD |
4477 | ERR("[notification-thread] Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
4478 | pipe, lttng_domain_type_str(domain)); | |
8b524060 FD |
4479 | goto end; |
4480 | } | |
4481 | ||
4482 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4483 | if (ret) { | |
4484 | ERR("[notification-thread] Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", | |
4485 | pipe, lttng_domain_type_str(domain)); | |
4486 | goto end; | |
4487 | } | |
4488 | ||
94078603 | 4489 | end: |
8b524060 | 4490 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4491 | return ret; |
4492 | } | |
4493 | ||
8b524060 FD |
4494 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4495 | int pipe, enum lttng_domain_type domain) | |
4496 | { | |
4497 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4498 | } | |
4499 | ||
ab0ee2ca JG |
4500 | int handle_notification_thread_channel_sample( |
4501 | struct notification_thread_state *state, int pipe, | |
4502 | enum lttng_domain_type domain) | |
4503 | { | |
4504 | int ret = 0; | |
4505 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4506 | struct channel_info *channel_info; |
4507 | struct cds_lfht_node *node; | |
4508 | struct cds_lfht_iter iter; | |
4509 | struct lttng_channel_trigger_list *trigger_list; | |
4510 | struct lttng_trigger_list_element *trigger_list_element; | |
4511 | bool previous_sample_available = false; | |
e8360425 JD |
4512 | struct channel_state_sample previous_sample, latest_sample; |
4513 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4514 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4515 | |
4516 | /* | |
4517 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4518 | * ensuring that read/write of sampling messages are atomic. | |
4519 | */ | |
7c2551ef | 4520 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
4521 | if (ret != sizeof(sample_msg)) { |
4522 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
4523 | pipe); | |
4524 | ret = -1; | |
4525 | goto end; | |
4526 | } | |
4527 | ||
4528 | ret = 0; | |
4529 | latest_sample.key.key = sample_msg.key; | |
4530 | latest_sample.key.domain = domain; | |
4531 | latest_sample.highest_usage = sample_msg.highest; | |
4532 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4533 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4534 | |
4535 | rcu_read_lock(); | |
4536 | ||
4537 | /* Retrieve the channel's informations */ | |
4538 | cds_lfht_lookup(state->channels_ht, | |
4539 | hash_channel_key(&latest_sample.key), | |
4540 | match_channel_info, | |
4541 | &latest_sample.key, | |
4542 | &iter); | |
4543 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4544 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4545 | /* |
4546 | * Not an error since the consumer can push a sample to the pipe | |
4547 | * and the rest of the session daemon could notify us of the | |
4548 | * channel's destruction before we get a chance to process that | |
4549 | * sample. | |
4550 | */ | |
4551 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
4552 | latest_sample.key.key, | |
526200e4 | 4553 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4554 | goto end_unlock; |
4555 | } | |
4556 | channel_info = caa_container_of(node, struct channel_info, | |
4557 | channels_ht_node); | |
e8360425 | 4558 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4559 | channel_info->name, |
ab0ee2ca | 4560 | latest_sample.key.key, |
8abe313a | 4561 | channel_info->session_info->name, |
ab0ee2ca | 4562 | latest_sample.highest_usage, |
e8360425 JD |
4563 | latest_sample.lowest_usage, |
4564 | latest_sample.channel_total_consumed); | |
4565 | ||
4566 | previous_session_consumed_total = | |
4567 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4568 | |
4569 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4570 | cds_lfht_lookup(state->channel_state_ht, | |
4571 | hash_channel_key(&latest_sample.key), | |
4572 | match_channel_state_sample, | |
4573 | &latest_sample.key, | |
4574 | &iter); | |
4575 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4576 | if (caa_likely(node)) { |
ab0ee2ca JG |
4577 | struct channel_state_sample *stored_sample; |
4578 | ||
4579 | /* Update the sample stored. */ | |
4580 | stored_sample = caa_container_of(node, | |
4581 | struct channel_state_sample, | |
4582 | channel_state_ht_node); | |
e8360425 | 4583 | |
ab0ee2ca JG |
4584 | memcpy(&previous_sample, stored_sample, |
4585 | sizeof(previous_sample)); | |
4586 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4587 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4588 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4589 | previous_sample_available = true; |
e8360425 JD |
4590 | |
4591 | latest_session_consumed_total = | |
4592 | previous_session_consumed_total + | |
4593 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4594 | } else { |
4595 | /* | |
4596 | * This is the channel's first sample, allocate space for and | |
4597 | * store the new sample. | |
4598 | */ | |
4599 | struct channel_state_sample *stored_sample; | |
4600 | ||
4601 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4602 | if (!stored_sample) { | |
4603 | ret = -1; | |
4604 | goto end_unlock; | |
4605 | } | |
4606 | ||
4607 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4608 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4609 | cds_lfht_add(state->channel_state_ht, | |
4610 | hash_channel_key(&stored_sample->key), | |
4611 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4612 | |
4613 | latest_session_consumed_total = | |
4614 | previous_session_consumed_total + | |
4615 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4616 | } |
4617 | ||
e8360425 JD |
4618 | channel_info->session_info->consumed_data_size = |
4619 | latest_session_consumed_total; | |
4620 | ||
ab0ee2ca JG |
4621 | /* Find triggers associated with this channel. */ |
4622 | cds_lfht_lookup(state->channel_triggers_ht, | |
4623 | hash_channel_key(&latest_sample.key), | |
4624 | match_channel_trigger_list, | |
4625 | &latest_sample.key, | |
4626 | &iter); | |
4627 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4628 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4629 | goto end_unlock; |
4630 | } | |
4631 | ||
f2b3ef9f | 4632 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4633 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4634 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4635 | }; |
4636 | ||
ab0ee2ca JG |
4637 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4638 | channel_triggers_ht_node); | |
4639 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4640 | node) { |
9b63a4aa | 4641 | const struct lttng_condition *condition; |
f2b3ef9f | 4642 | struct lttng_trigger *trigger; |
505b2d90 | 4643 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4644 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4645 | enum action_executor_status executor_status; |
ab0ee2ca | 4646 | |
505b2d90 | 4647 | ret = 0; |
ab0ee2ca | 4648 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4649 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 4650 | assert(condition); |
ab0ee2ca JG |
4651 | |
4652 | /* | |
4653 | * Check if any client is subscribed to the result of this | |
4654 | * evaluation. | |
4655 | */ | |
ed327204 | 4656 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4657 | |
ed327204 | 4658 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4659 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4660 | &latest_sample, |
4661 | previous_session_consumed_total, | |
4662 | latest_session_consumed_total, | |
4663 | channel_info); | |
4664 | if (caa_unlikely(ret)) { | |
505b2d90 | 4665 | goto put_list; |
ab0ee2ca JG |
4666 | } |
4667 | ||
e8360425 | 4668 | if (caa_likely(!evaluation)) { |
505b2d90 | 4669 | goto put_list; |
ab0ee2ca JG |
4670 | } |
4671 | ||
f8522f5c JR |
4672 | if (!lttng_trigger_should_fire(trigger)) { |
4673 | goto put_list; | |
4674 | } | |
4675 | ||
4676 | lttng_trigger_fire(trigger); | |
4677 | ||
f2b3ef9f JG |
4678 | /* |
4679 | * Ownership of `evaluation` transferred to the action executor | |
4680 | * no matter the result. | |
4681 | */ | |
4682 | executor_status = action_executor_enqueue(state->executor, | |
4683 | trigger, evaluation, &channel_creds, | |
4684 | client_list); | |
4685 | evaluation = NULL; | |
4686 | switch (executor_status) { | |
4687 | case ACTION_EXECUTOR_STATUS_OK: | |
4688 | break; | |
4689 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4690 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4691 | /* | |
4692 | * TODO Add trigger identification (name/id) when | |
4693 | * it is added to the API. | |
4694 | */ | |
4695 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4696 | ret = -1; | |
4697 | goto put_list; | |
4698 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4699 | /* | |
4700 | * TODO Add trigger identification (name/id) when | |
4701 | * it is added to the API. | |
4702 | * | |
4703 | * Not a fatal error. | |
4704 | */ | |
4705 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4706 | ret = 0; | |
4707 | goto put_list; | |
4708 | default: | |
4709 | abort(); | |
4710 | } | |
4711 | ||
505b2d90 JG |
4712 | put_list: |
4713 | notification_client_list_put(client_list); | |
e0b5f87b | 4714 | if (caa_unlikely(ret)) { |
505b2d90 | 4715 | break; |
ab0ee2ca JG |
4716 | } |
4717 | } | |
4718 | end_unlock: | |
4719 | rcu_read_unlock(); | |
4720 | end: | |
4721 | return ret; | |
4722 | } |