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ab0ee2ca | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
ab0ee2ca | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
ab0ee2ca | 5 | * |
ab0ee2ca JG |
6 | */ |
7 | ||
f2b3ef9f JG |
8 | #include "lttng/action/action.h" |
9 | #include "lttng/trigger/trigger-internal.h" | |
ab0ee2ca JG |
10 | #define _LGPL_SOURCE |
11 | #include <urcu.h> | |
12 | #include <urcu/rculfhash.h> | |
13 | ||
ab0ee2ca JG |
14 | #include <common/defaults.h> |
15 | #include <common/error.h> | |
16 | #include <common/futex.h> | |
17 | #include <common/unix.h> | |
18 | #include <common/dynamic-buffer.h> | |
19 | #include <common/hashtable/utils.h> | |
20 | #include <common/sessiond-comm/sessiond-comm.h> | |
21 | #include <common/macros.h> | |
22 | #include <lttng/condition/condition.h> | |
9b63a4aa | 23 | #include <lttng/action/action-internal.h> |
93ac2c44 JR |
24 | #include <lttng/action/group-internal.h> |
25 | #include <lttng/domain-internal.h> | |
ab0ee2ca JG |
26 | #include <lttng/notification/notification-internal.h> |
27 | #include <lttng/condition/condition-internal.h> | |
28 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 29 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 30 | #include <lttng/condition/session-rotation-internal.h> |
959e3c66 | 31 | #include <lttng/condition/event-rule-internal.h> |
d02d7404 | 32 | #include <lttng/domain-internal.h> |
ab0ee2ca | 33 | #include <lttng/notification/channel-internal.h> |
85c06c44 | 34 | #include <lttng/trigger/trigger-internal.h> |
959e3c66 | 35 | #include <lttng/event-rule/event-rule-internal.h> |
1da26331 | 36 | |
ab0ee2ca JG |
37 | #include <time.h> |
38 | #include <unistd.h> | |
39 | #include <assert.h> | |
40 | #include <inttypes.h> | |
d53ea4e4 | 41 | #include <fcntl.h> |
ab0ee2ca | 42 | |
e98a976a | 43 | #include "condition-internal.h" |
1da26331 JG |
44 | #include "notification-thread.h" |
45 | #include "notification-thread-events.h" | |
46 | #include "notification-thread-commands.h" | |
47 | #include "lttng-sessiond.h" | |
48 | #include "kernel.h" | |
49 | ||
ab0ee2ca JG |
50 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
51 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
52 | ||
82b3cbf4 JR |
53 | /* The tracers currently limit the capture size to PIPE_BUF (4kb on linux). */ |
54 | #define MAX_CAPTURE_SIZE (PIPE_BUF) | |
55 | ||
51eab943 JG |
56 | enum lttng_object_type { |
57 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
58 | LTTNG_OBJECT_TYPE_NONE, | |
59 | LTTNG_OBJECT_TYPE_CHANNEL, | |
60 | LTTNG_OBJECT_TYPE_SESSION, | |
61 | }; | |
62 | ||
ab0ee2ca | 63 | struct lttng_trigger_list_element { |
9e0bb80e | 64 | /* No ownership of the trigger object is assumed. */ |
f2b3ef9f | 65 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
66 | struct cds_list_head node; |
67 | }; | |
68 | ||
69 | struct lttng_channel_trigger_list { | |
70 | struct channel_key channel_key; | |
ea9a44f0 | 71 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 72 | struct cds_list_head list; |
ea9a44f0 | 73 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 74 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
75 | /* call_rcu delayed reclaim. */ |
76 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
77 | }; |
78 | ||
ea9a44f0 JG |
79 | /* |
80 | * List of triggers applying to a given session. | |
81 | * | |
82 | * See: | |
83 | * - lttng_session_trigger_list_create() | |
84 | * - lttng_session_trigger_list_build() | |
85 | * - lttng_session_trigger_list_destroy() | |
86 | * - lttng_session_trigger_list_add() | |
87 | */ | |
88 | struct lttng_session_trigger_list { | |
89 | /* | |
90 | * Not owned by this; points to the session_info structure's | |
91 | * session name. | |
92 | */ | |
93 | const char *session_name; | |
94 | /* List of struct lttng_trigger_list_element. */ | |
95 | struct cds_list_head list; | |
96 | /* Node in the session_triggers_ht */ | |
97 | struct cds_lfht_node session_triggers_ht_node; | |
98 | /* | |
99 | * Weak reference to the notification system's session triggers | |
100 | * hashtable. | |
101 | * | |
102 | * The session trigger list structure structure is owned by | |
103 | * the session's session_info. | |
104 | * | |
105 | * The session_info is kept alive the the channel_infos holding a | |
106 | * reference to it (reference counting). When those channels are | |
107 | * destroyed (at runtime or on teardown), the reference they hold | |
108 | * to the session_info are released. On destruction of session_info, | |
109 | * session_info_destroy() will remove the list of triggers applying | |
110 | * to this session from the notification system's state. | |
111 | * | |
112 | * This implies that the session_triggers_ht must be destroyed | |
113 | * after the channels. | |
114 | */ | |
115 | struct cds_lfht *session_triggers_ht; | |
116 | /* Used for delayed RCU reclaim. */ | |
117 | struct rcu_head rcu_node; | |
118 | }; | |
119 | ||
ab0ee2ca JG |
120 | struct lttng_trigger_ht_element { |
121 | struct lttng_trigger *trigger; | |
122 | struct cds_lfht_node node; | |
242388e4 | 123 | struct cds_lfht_node node_by_name_uid; |
83b934ad MD |
124 | /* call_rcu delayed reclaim. */ |
125 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
126 | }; |
127 | ||
128 | struct lttng_condition_list_element { | |
129 | struct lttng_condition *condition; | |
130 | struct cds_list_head node; | |
131 | }; | |
132 | ||
ab0ee2ca JG |
133 | struct channel_state_sample { |
134 | struct channel_key key; | |
135 | struct cds_lfht_node channel_state_ht_node; | |
136 | uint64_t highest_usage; | |
137 | uint64_t lowest_usage; | |
e8360425 | 138 | uint64_t channel_total_consumed; |
83b934ad MD |
139 | /* call_rcu delayed reclaim. */ |
140 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
141 | }; |
142 | ||
e4db5ace | 143 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 144 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 145 | struct lttng_evaluation **evaluation, |
e8360425 JD |
146 | const struct notification_thread_state *state, |
147 | const struct channel_state_sample *previous_sample, | |
148 | const struct channel_state_sample *latest_sample, | |
149 | uint64_t previous_session_consumed_total, | |
150 | uint64_t latest_session_consumed_total, | |
151 | struct channel_info *channel_info); | |
e4db5ace | 152 | static |
9b63a4aa JG |
153 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
154 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
155 | struct notification_client_list *client_list, |
156 | struct notification_thread_state *state, | |
157 | uid_t channel_uid, gid_t channel_gid); | |
158 | ||
8abe313a | 159 | |
ea9a44f0 | 160 | /* session_info API */ |
8abe313a JG |
161 | static |
162 | void session_info_destroy(void *_data); | |
163 | static | |
164 | void session_info_get(struct session_info *session_info); | |
165 | static | |
166 | void session_info_put(struct session_info *session_info); | |
167 | static | |
168 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 169 | uid_t uid, gid_t gid, |
1eee26c5 JG |
170 | struct lttng_session_trigger_list *trigger_list, |
171 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
172 | static |
173 | void session_info_add_channel(struct session_info *session_info, | |
174 | struct channel_info *channel_info); | |
175 | static | |
176 | void session_info_remove_channel(struct session_info *session_info, | |
177 | struct channel_info *channel_info); | |
178 | ||
ea9a44f0 JG |
179 | /* lttng_session_trigger_list API */ |
180 | static | |
181 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
182 | const char *session_name, | |
183 | struct cds_lfht *session_triggers_ht); | |
184 | static | |
185 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
186 | const struct notification_thread_state *state, | |
187 | const char *session_name); | |
188 | static | |
189 | void lttng_session_trigger_list_destroy( | |
190 | struct lttng_session_trigger_list *list); | |
191 | static | |
192 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 193 | struct lttng_trigger *trigger); |
ea9a44f0 | 194 | |
f2b3ef9f JG |
195 | static |
196 | int client_handle_transmission_status( | |
197 | struct notification_client *client, | |
198 | enum client_transmission_status transmission_status, | |
199 | struct notification_thread_state *state); | |
ea9a44f0 | 200 | |
8b524060 FD |
201 | static |
202 | int handle_one_event_notifier_notification( | |
203 | struct notification_thread_state *state, | |
204 | int pipe, enum lttng_domain_type domain); | |
205 | ||
242388e4 JR |
206 | static |
207 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node); | |
208 | ||
ab0ee2ca | 209 | static |
ac1889bf | 210 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
211 | { |
212 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
213 | const int socket = (int) (intptr_t) key; |
214 | const struct notification_client *client = caa_container_of(node, | |
215 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 216 | |
ac1889bf JG |
217 | return client->socket == socket; |
218 | } | |
219 | ||
220 | static | |
221 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
222 | { | |
223 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
224 | const notification_client_id id = *((notification_client_id *) key); | |
225 | const struct notification_client *client = caa_container_of( | |
226 | node, struct notification_client, client_id_ht_node); | |
ab0ee2ca | 227 | |
ac1889bf | 228 | return client->id == id; |
ab0ee2ca JG |
229 | } |
230 | ||
231 | static | |
232 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
233 | { | |
234 | struct channel_key *channel_key = (struct channel_key *) key; | |
235 | struct lttng_channel_trigger_list *trigger_list; | |
236 | ||
237 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
238 | channel_triggers_ht_node); | |
239 | ||
240 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
241 | (channel_key->domain == trigger_list->channel_key.domain)); | |
242 | } | |
243 | ||
51eab943 JG |
244 | static |
245 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
246 | { | |
247 | const char *session_name = (const char *) key; | |
248 | struct lttng_session_trigger_list *trigger_list; | |
249 | ||
250 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
251 | session_triggers_ht_node); | |
252 | ||
253 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
254 | } | |
255 | ||
ab0ee2ca JG |
256 | static |
257 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
258 | { | |
259 | struct channel_key *channel_key = (struct channel_key *) key; | |
260 | struct channel_state_sample *sample; | |
261 | ||
262 | sample = caa_container_of(node, struct channel_state_sample, | |
263 | channel_state_ht_node); | |
264 | ||
265 | return !!((channel_key->key == sample->key.key) && | |
266 | (channel_key->domain == sample->key.domain)); | |
267 | } | |
268 | ||
269 | static | |
270 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
271 | { | |
272 | struct channel_key *channel_key = (struct channel_key *) key; | |
273 | struct channel_info *channel_info; | |
274 | ||
275 | channel_info = caa_container_of(node, struct channel_info, | |
276 | channels_ht_node); | |
277 | ||
278 | return !!((channel_key->key == channel_info->key.key) && | |
279 | (channel_key->domain == channel_info->key.domain)); | |
280 | } | |
281 | ||
282 | static | |
242388e4 | 283 | int match_trigger(struct cds_lfht_node *node, const void *key) |
ab0ee2ca | 284 | { |
242388e4 JR |
285 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; |
286 | struct lttng_trigger_ht_element *trigger_ht_element; | |
ab0ee2ca | 287 | |
242388e4 | 288 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, |
ab0ee2ca | 289 | node); |
ab0ee2ca | 290 | |
242388e4 | 291 | return !!lttng_trigger_is_equal(trigger_key, trigger_ht_element->trigger); |
ab0ee2ca JG |
292 | } |
293 | ||
e7c93cf9 JR |
294 | static |
295 | int match_trigger_token(struct cds_lfht_node *node, const void *key) | |
296 | { | |
297 | const uint64_t *_key = key; | |
298 | struct notification_trigger_tokens_ht_element *element; | |
299 | ||
300 | element = caa_container_of(node, | |
301 | struct notification_trigger_tokens_ht_element, node); | |
302 | return *_key == element->token; | |
303 | } | |
304 | ||
ab0ee2ca JG |
305 | static |
306 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
307 | { | |
308 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
309 | struct notification_client_list *client_list; | |
f82f93a1 | 310 | const struct lttng_condition *condition; |
ab0ee2ca JG |
311 | |
312 | assert(condition_key); | |
313 | ||
314 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 315 | notification_trigger_clients_ht_node); |
f82f93a1 | 316 | condition = lttng_trigger_get_const_condition(client_list->trigger); |
ab0ee2ca JG |
317 | |
318 | return !!lttng_condition_is_equal(condition_key, condition); | |
319 | } | |
320 | ||
f82f93a1 JG |
321 | static |
322 | int match_session(struct cds_lfht_node *node, const void *key) | |
323 | { | |
324 | const char *name = key; | |
325 | struct session_info *session_info = caa_container_of( | |
326 | node, struct session_info, sessions_ht_node); | |
327 | ||
328 | return !strcmp(session_info->name, name); | |
329 | } | |
330 | ||
6900ae81 FD |
331 | static |
332 | const char *notification_command_type_str( | |
333 | enum notification_thread_command_type type) | |
334 | { | |
335 | switch (type) { | |
336 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
337 | return "REGISTER_TRIGGER"; | |
338 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
339 | return "UNREGISTER_TRIGGER"; | |
340 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
341 | return "ADD_CHANNEL"; | |
342 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
343 | return "REMOVE_CHANNEL"; | |
344 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: | |
345 | return "SESSION_ROTATION_ONGOING"; | |
346 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: | |
347 | return "SESSION_ROTATION_COMPLETED"; | |
348 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: | |
349 | return "ADD_TRACER_EVENT_SOURCE"; | |
350 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
351 | return "REMOVE_TRACER_EVENT_SOURCE"; | |
352 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: | |
353 | return "LIST_TRIGGERS"; | |
354 | case NOTIFICATION_COMMAND_TYPE_QUIT: | |
355 | return "QUIT"; | |
356 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: | |
357 | return "CLIENT_COMMUNICATION_UPDATE"; | |
358 | default: | |
359 | abort(); | |
360 | } | |
361 | } | |
362 | ||
242388e4 JR |
363 | /* |
364 | * Match trigger based on name and credentials only. | |
365 | * Name duplication is NOT allowed for the same uid. | |
366 | */ | |
367 | static | |
368 | int match_trigger_by_name_uid(struct cds_lfht_node *node, | |
369 | const void *key) | |
370 | { | |
371 | bool match = false; | |
372 | const char *name; | |
373 | const char *key_name; | |
374 | enum lttng_trigger_status status; | |
375 | const struct lttng_credentials *key_creds; | |
376 | const struct lttng_credentials *node_creds; | |
377 | const struct lttng_trigger *trigger_key = | |
378 | (const struct lttng_trigger *) key; | |
379 | const struct lttng_trigger_ht_element *trigger_ht_element = | |
380 | caa_container_of(node, | |
381 | struct lttng_trigger_ht_element, | |
382 | node_by_name_uid); | |
383 | ||
384 | status = lttng_trigger_get_name(trigger_ht_element->trigger, &name); | |
385 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
386 | ||
387 | status = lttng_trigger_get_name(trigger_key, &key_name); | |
388 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
389 | ||
390 | /* Compare the names. */ | |
391 | if (strcmp(name, key_name) != 0) { | |
392 | goto end; | |
393 | } | |
394 | ||
395 | /* Compare the owners' UIDs. */ | |
396 | key_creds = lttng_trigger_get_credentials(trigger_key); | |
397 | node_creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
398 | ||
399 | match = lttng_credentials_is_equal_uid(key_creds, node_creds); | |
400 | ||
401 | end: | |
402 | return match; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Hash trigger based on name and credentials only. | |
407 | */ | |
408 | static | |
409 | unsigned long hash_trigger_by_name_uid(const struct lttng_trigger *trigger) | |
410 | { | |
411 | unsigned long hash = 0; | |
412 | const struct lttng_credentials *trigger_creds; | |
413 | const char *trigger_name; | |
414 | enum lttng_trigger_status status; | |
415 | ||
416 | status = lttng_trigger_get_name(trigger, &trigger_name); | |
417 | if (status == LTTNG_TRIGGER_STATUS_OK) { | |
418 | hash = hash_key_str(trigger_name, lttng_ht_seed); | |
419 | } | |
420 | ||
421 | trigger_creds = lttng_trigger_get_credentials(trigger); | |
422 | hash ^= hash_key_ulong((void *) (unsigned long) LTTNG_OPTIONAL_GET(trigger_creds->uid), | |
423 | lttng_ht_seed); | |
424 | ||
425 | return hash; | |
426 | } | |
427 | ||
e4db5ace JR |
428 | static |
429 | unsigned long hash_channel_key(struct channel_key *key) | |
430 | { | |
431 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
432 | unsigned long domain_hash = hash_key_ulong( | |
433 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
434 | ||
435 | return key_hash ^ domain_hash; | |
436 | } | |
437 | ||
ac1889bf JG |
438 | static |
439 | unsigned long hash_client_socket(int socket) | |
440 | { | |
441 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
442 | } | |
443 | ||
444 | static | |
445 | unsigned long hash_client_id(notification_client_id id) | |
446 | { | |
447 | return hash_key_u64(&id, lttng_ht_seed); | |
448 | } | |
449 | ||
f82f93a1 JG |
450 | /* |
451 | * Get the type of object to which a given condition applies. Bindings let | |
452 | * the notification system evaluate a trigger's condition when a given | |
453 | * object's state is updated. | |
454 | * | |
455 | * For instance, a condition bound to a channel will be evaluated everytime | |
456 | * the channel's state is changed by a channel monitoring sample. | |
457 | */ | |
458 | static | |
459 | enum lttng_object_type get_condition_binding_object( | |
460 | const struct lttng_condition *condition) | |
461 | { | |
462 | switch (lttng_condition_get_type(condition)) { | |
463 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
464 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
465 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 466 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
467 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
468 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
469 | return LTTNG_OBJECT_TYPE_SESSION; | |
d602bd6a | 470 | case LTTNG_CONDITION_TYPE_ON_EVENT: |
959e3c66 | 471 | return LTTNG_OBJECT_TYPE_NONE; |
f82f93a1 JG |
472 | default: |
473 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
474 | } | |
475 | } | |
476 | ||
83b934ad MD |
477 | static |
478 | void free_channel_info_rcu(struct rcu_head *node) | |
479 | { | |
480 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
481 | } | |
482 | ||
ab0ee2ca JG |
483 | static |
484 | void channel_info_destroy(struct channel_info *channel_info) | |
485 | { | |
486 | if (!channel_info) { | |
487 | return; | |
488 | } | |
489 | ||
8abe313a JG |
490 | if (channel_info->session_info) { |
491 | session_info_remove_channel(channel_info->session_info, | |
492 | channel_info); | |
493 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 494 | } |
8abe313a JG |
495 | if (channel_info->name) { |
496 | free(channel_info->name); | |
ab0ee2ca | 497 | } |
83b934ad MD |
498 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
499 | } | |
500 | ||
501 | static | |
502 | void free_session_info_rcu(struct rcu_head *node) | |
503 | { | |
504 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
505 | } |
506 | ||
8abe313a | 507 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 508 | static |
8abe313a | 509 | void session_info_destroy(void *_data) |
ab0ee2ca | 510 | { |
8abe313a | 511 | struct session_info *session_info = _data; |
3b68d0a3 | 512 | int ret; |
ab0ee2ca | 513 | |
8abe313a JG |
514 | assert(session_info); |
515 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
516 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
517 | if (ret) { | |
4c3f302b | 518 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 519 | } |
8abe313a | 520 | } |
ea9a44f0 | 521 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
522 | |
523 | rcu_read_lock(); | |
524 | cds_lfht_del(session_info->sessions_ht, | |
525 | &session_info->sessions_ht_node); | |
526 | rcu_read_unlock(); | |
8abe313a | 527 | free(session_info->name); |
83b934ad | 528 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 529 | } |
ab0ee2ca | 530 | |
8abe313a JG |
531 | static |
532 | void session_info_get(struct session_info *session_info) | |
533 | { | |
534 | if (!session_info) { | |
535 | return; | |
536 | } | |
537 | lttng_ref_get(&session_info->ref); | |
538 | } | |
539 | ||
540 | static | |
541 | void session_info_put(struct session_info *session_info) | |
542 | { | |
543 | if (!session_info) { | |
544 | return; | |
ab0ee2ca | 545 | } |
8abe313a JG |
546 | lttng_ref_put(&session_info->ref); |
547 | } | |
548 | ||
549 | static | |
ea9a44f0 | 550 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
551 | struct lttng_session_trigger_list *trigger_list, |
552 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
553 | { |
554 | struct session_info *session_info; | |
ab0ee2ca | 555 | |
8abe313a | 556 | assert(name); |
ab0ee2ca | 557 | |
8abe313a JG |
558 | session_info = zmalloc(sizeof(*session_info)); |
559 | if (!session_info) { | |
560 | goto end; | |
561 | } | |
562 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
563 | ||
564 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
565 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
566 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
567 | goto error; |
568 | } | |
8abe313a JG |
569 | |
570 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
571 | session_info->name = strdup(name); | |
572 | if (!session_info->name) { | |
ab0ee2ca JG |
573 | goto error; |
574 | } | |
8abe313a JG |
575 | session_info->uid = uid; |
576 | session_info->gid = gid; | |
ea9a44f0 | 577 | session_info->trigger_list = trigger_list; |
1eee26c5 | 578 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
579 | end: |
580 | return session_info; | |
581 | error: | |
582 | session_info_put(session_info); | |
583 | return NULL; | |
584 | } | |
585 | ||
586 | static | |
587 | void session_info_add_channel(struct session_info *session_info, | |
588 | struct channel_info *channel_info) | |
589 | { | |
590 | rcu_read_lock(); | |
591 | cds_lfht_add(session_info->channel_infos_ht, | |
592 | hash_channel_key(&channel_info->key), | |
593 | &channel_info->session_info_channels_ht_node); | |
594 | rcu_read_unlock(); | |
595 | } | |
596 | ||
597 | static | |
598 | void session_info_remove_channel(struct session_info *session_info, | |
599 | struct channel_info *channel_info) | |
600 | { | |
601 | rcu_read_lock(); | |
602 | cds_lfht_del(session_info->channel_infos_ht, | |
603 | &channel_info->session_info_channels_ht_node); | |
604 | rcu_read_unlock(); | |
605 | } | |
606 | ||
607 | static | |
608 | struct channel_info *channel_info_create(const char *channel_name, | |
609 | struct channel_key *channel_key, uint64_t channel_capacity, | |
610 | struct session_info *session_info) | |
611 | { | |
612 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
613 | ||
614 | if (!channel_info) { | |
615 | goto end; | |
616 | } | |
617 | ||
ab0ee2ca | 618 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
619 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
620 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
621 | channel_info->capacity = channel_capacity; | |
622 | ||
623 | channel_info->name = strdup(channel_name); | |
624 | if (!channel_info->name) { | |
625 | goto error; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Set the references between session and channel infos: | |
630 | * - channel_info holds a strong reference to session_info | |
631 | * - session_info holds a weak reference to channel_info | |
632 | */ | |
633 | session_info_get(session_info); | |
634 | session_info_add_channel(session_info, channel_info); | |
635 | channel_info->session_info = session_info; | |
ab0ee2ca | 636 | end: |
8abe313a | 637 | return channel_info; |
ab0ee2ca | 638 | error: |
8abe313a | 639 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
640 | return NULL; |
641 | } | |
642 | ||
f2b3ef9f | 643 | LTTNG_HIDDEN |
505b2d90 JG |
644 | bool notification_client_list_get(struct notification_client_list *list) |
645 | { | |
646 | return urcu_ref_get_unless_zero(&list->ref); | |
647 | } | |
648 | ||
649 | static | |
650 | void free_notification_client_list_rcu(struct rcu_head *node) | |
651 | { | |
652 | free(caa_container_of(node, struct notification_client_list, | |
653 | rcu_node)); | |
654 | } | |
655 | ||
656 | static | |
657 | void notification_client_list_release(struct urcu_ref *list_ref) | |
658 | { | |
659 | struct notification_client_list *list = | |
660 | container_of(list_ref, typeof(*list), ref); | |
661 | struct notification_client_list_element *client_list_element, *tmp; | |
662 | ||
663 | if (list->notification_trigger_clients_ht) { | |
664 | rcu_read_lock(); | |
665 | cds_lfht_del(list->notification_trigger_clients_ht, | |
666 | &list->notification_trigger_clients_ht_node); | |
667 | rcu_read_unlock(); | |
668 | list->notification_trigger_clients_ht = NULL; | |
669 | } | |
670 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
671 | &list->list, node) { | |
672 | free(client_list_element); | |
673 | } | |
674 | pthread_mutex_destroy(&list->lock); | |
675 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
676 | } | |
677 | ||
678 | static | |
679 | struct notification_client_list *notification_client_list_create( | |
680 | const struct lttng_trigger *trigger) | |
681 | { | |
682 | struct notification_client_list *client_list = | |
683 | zmalloc(sizeof(*client_list)); | |
684 | ||
685 | if (!client_list) { | |
686 | goto error; | |
687 | } | |
688 | pthread_mutex_init(&client_list->lock, NULL); | |
689 | urcu_ref_init(&client_list->ref); | |
690 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
691 | CDS_INIT_LIST_HEAD(&client_list->list); | |
692 | client_list->trigger = trigger; | |
693 | error: | |
694 | return client_list; | |
695 | } | |
696 | ||
697 | static | |
698 | void publish_notification_client_list( | |
699 | struct notification_thread_state *state, | |
700 | struct notification_client_list *list) | |
701 | { | |
702 | const struct lttng_condition *condition = | |
703 | lttng_trigger_get_const_condition(list->trigger); | |
704 | ||
705 | assert(!list->notification_trigger_clients_ht); | |
f2b3ef9f | 706 | notification_client_list_get(list); |
505b2d90 JG |
707 | |
708 | list->notification_trigger_clients_ht = | |
709 | state->notification_trigger_clients_ht; | |
710 | ||
711 | rcu_read_lock(); | |
712 | cds_lfht_add(state->notification_trigger_clients_ht, | |
713 | lttng_condition_hash(condition), | |
714 | &list->notification_trigger_clients_ht_node); | |
715 | rcu_read_unlock(); | |
716 | } | |
717 | ||
f2b3ef9f | 718 | LTTNG_HIDDEN |
505b2d90 JG |
719 | void notification_client_list_put(struct notification_client_list *list) |
720 | { | |
721 | if (!list) { | |
722 | return; | |
723 | } | |
724 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
725 | } | |
726 | ||
727 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
728 | static |
729 | struct notification_client_list *get_client_list_from_condition( | |
730 | struct notification_thread_state *state, | |
731 | const struct lttng_condition *condition) | |
732 | { | |
733 | struct cds_lfht_node *node; | |
734 | struct cds_lfht_iter iter; | |
505b2d90 | 735 | struct notification_client_list *list = NULL; |
ed327204 | 736 | |
505b2d90 | 737 | rcu_read_lock(); |
ed327204 JG |
738 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
739 | lttng_condition_hash(condition), | |
740 | match_client_list_condition, | |
741 | condition, | |
742 | &iter); | |
743 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
744 | if (node) { |
745 | list = container_of(node, struct notification_client_list, | |
746 | notification_trigger_clients_ht_node); | |
747 | list = notification_client_list_get(list) ? list : NULL; | |
748 | } | |
ed327204 | 749 | |
505b2d90 JG |
750 | rcu_read_unlock(); |
751 | return list; | |
ed327204 JG |
752 | } |
753 | ||
e4db5ace | 754 | static |
f82f93a1 JG |
755 | int evaluate_channel_condition_for_client( |
756 | const struct lttng_condition *condition, | |
757 | struct notification_thread_state *state, | |
758 | struct lttng_evaluation **evaluation, | |
759 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
760 | { |
761 | int ret; | |
762 | struct cds_lfht_iter iter; | |
763 | struct cds_lfht_node *node; | |
764 | struct channel_info *channel_info = NULL; | |
765 | struct channel_key *channel_key = NULL; | |
766 | struct channel_state_sample *last_sample = NULL; | |
767 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 768 | |
505b2d90 JG |
769 | rcu_read_lock(); |
770 | ||
f82f93a1 | 771 | /* Find the channel associated with the condition. */ |
e4db5ace | 772 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 773 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
774 | struct lttng_trigger_list_element *element; |
775 | ||
776 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 777 | const struct lttng_condition *current_condition = |
f82f93a1 | 778 | lttng_trigger_get_const_condition( |
e4db5ace JR |
779 | element->trigger); |
780 | ||
781 | assert(current_condition); | |
782 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 783 | current_condition)) { |
e4db5ace JR |
784 | continue; |
785 | } | |
786 | ||
787 | /* Found the trigger, save the channel key. */ | |
788 | channel_key = &channel_trigger_list->channel_key; | |
789 | break; | |
790 | } | |
791 | if (channel_key) { | |
792 | /* The channel key was found stop iteration. */ | |
793 | break; | |
794 | } | |
795 | } | |
796 | ||
797 | if (!channel_key){ | |
798 | /* No channel found; normal exit. */ | |
f82f93a1 | 799 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
800 | ret = 0; |
801 | goto end; | |
802 | } | |
803 | ||
804 | /* Fetch channel info for the matching channel. */ | |
805 | cds_lfht_lookup(state->channels_ht, | |
806 | hash_channel_key(channel_key), | |
807 | match_channel_info, | |
808 | channel_key, | |
809 | &iter); | |
810 | node = cds_lfht_iter_get_node(&iter); | |
811 | assert(node); | |
812 | channel_info = caa_container_of(node, struct channel_info, | |
813 | channels_ht_node); | |
814 | ||
815 | /* Retrieve the channel's last sample, if it exists. */ | |
816 | cds_lfht_lookup(state->channel_state_ht, | |
817 | hash_channel_key(channel_key), | |
818 | match_channel_state_sample, | |
819 | channel_key, | |
820 | &iter); | |
821 | node = cds_lfht_iter_get_node(&iter); | |
822 | if (node) { | |
823 | last_sample = caa_container_of(node, | |
824 | struct channel_state_sample, | |
825 | channel_state_ht_node); | |
826 | } else { | |
827 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
828 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
829 | ret = 0; | |
830 | goto end; | |
831 | } | |
832 | ||
f82f93a1 | 833 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
834 | NULL, last_sample, |
835 | 0, channel_info->session_info->consumed_data_size, | |
836 | channel_info); | |
e4db5ace | 837 | if (ret) { |
066a3c82 | 838 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
839 | goto end; |
840 | } | |
841 | ||
f82f93a1 JG |
842 | *session_uid = channel_info->session_info->uid; |
843 | *session_gid = channel_info->session_info->gid; | |
844 | end: | |
505b2d90 | 845 | rcu_read_unlock(); |
f82f93a1 JG |
846 | return ret; |
847 | } | |
848 | ||
849 | static | |
850 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
851 | { | |
852 | const char *session_name = NULL; | |
853 | enum lttng_condition_status status; | |
854 | ||
855 | switch (lttng_condition_get_type(condition)) { | |
856 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
857 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
858 | status = lttng_condition_buffer_usage_get_session_name( | |
859 | condition, &session_name); | |
860 | break; | |
861 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
862 | status = lttng_condition_session_consumed_size_get_session_name( | |
863 | condition, &session_name); | |
864 | break; | |
865 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
866 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
867 | status = lttng_condition_session_rotation_get_session_name( | |
868 | condition, &session_name); | |
869 | break; | |
870 | default: | |
871 | abort(); | |
872 | } | |
873 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
874 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
875 | goto end; | |
876 | } | |
877 | end: | |
878 | return session_name; | |
879 | } | |
880 | ||
f82f93a1 JG |
881 | static |
882 | int evaluate_session_condition_for_client( | |
883 | const struct lttng_condition *condition, | |
884 | struct notification_thread_state *state, | |
885 | struct lttng_evaluation **evaluation, | |
886 | uid_t *session_uid, gid_t *session_gid) | |
887 | { | |
888 | int ret; | |
889 | struct cds_lfht_iter iter; | |
890 | struct cds_lfht_node *node; | |
891 | const char *session_name; | |
892 | struct session_info *session_info = NULL; | |
893 | ||
505b2d90 | 894 | rcu_read_lock(); |
f82f93a1 JG |
895 | session_name = get_condition_session_name(condition); |
896 | ||
897 | /* Find the session associated with the trigger. */ | |
898 | cds_lfht_lookup(state->sessions_ht, | |
899 | hash_key_str(session_name, lttng_ht_seed), | |
900 | match_session, | |
901 | session_name, | |
902 | &iter); | |
903 | node = cds_lfht_iter_get_node(&iter); | |
904 | if (!node) { | |
905 | DBG("[notification-thread] No known session matching name \"%s\"", | |
906 | session_name); | |
907 | ret = 0; | |
908 | goto end; | |
909 | } | |
910 | ||
911 | session_info = caa_container_of(node, struct session_info, | |
912 | sessions_ht_node); | |
913 | session_info_get(session_info); | |
914 | ||
915 | /* | |
916 | * Evaluation is performed in-line here since only one type of | |
917 | * session-bound condition is handled for the moment. | |
918 | */ | |
919 | switch (lttng_condition_get_type(condition)) { | |
920 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
921 | if (!session_info->rotation.ongoing) { | |
be558f88 | 922 | ret = 0; |
f82f93a1 JG |
923 | goto end_session_put; |
924 | } | |
925 | ||
926 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
927 | session_info->rotation.id); | |
928 | if (!*evaluation) { | |
929 | /* Fatal error. */ | |
930 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
931 | session_info->name); | |
932 | ret = -1; | |
933 | goto end_session_put; | |
934 | } | |
935 | ret = 0; | |
936 | break; | |
937 | default: | |
938 | ret = 0; | |
939 | goto end_session_put; | |
940 | } | |
941 | ||
942 | *session_uid = session_info->uid; | |
943 | *session_gid = session_info->gid; | |
944 | ||
945 | end_session_put: | |
946 | session_info_put(session_info); | |
947 | end: | |
505b2d90 | 948 | rcu_read_unlock(); |
f82f93a1 JG |
949 | return ret; |
950 | } | |
951 | ||
f82f93a1 JG |
952 | static |
953 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
954 | const struct lttng_condition *condition, | |
955 | struct notification_client *client, | |
956 | struct notification_thread_state *state) | |
957 | { | |
958 | int ret; | |
959 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
960 | struct notification_client_list client_list = { |
961 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
962 | }; | |
f82f93a1 JG |
963 | struct notification_client_list_element client_list_element = { 0 }; |
964 | uid_t object_uid = 0; | |
965 | gid_t object_gid = 0; | |
966 | ||
967 | assert(trigger); | |
968 | assert(condition); | |
969 | assert(client); | |
970 | assert(state); | |
971 | ||
972 | switch (get_condition_binding_object(condition)) { | |
973 | case LTTNG_OBJECT_TYPE_SESSION: | |
974 | ret = evaluate_session_condition_for_client(condition, state, | |
975 | &evaluation, &object_uid, &object_gid); | |
976 | break; | |
977 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
978 | ret = evaluate_channel_condition_for_client(condition, state, | |
979 | &evaluation, &object_uid, &object_gid); | |
980 | break; | |
981 | case LTTNG_OBJECT_TYPE_NONE: | |
7e802d0a | 982 | DBG("[notification-thread] Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
983 | ret = 0; |
984 | goto end; | |
985 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
986 | default: | |
987 | ret = -1; | |
988 | goto end; | |
989 | } | |
af0c318d JG |
990 | if (ret) { |
991 | /* Fatal error. */ | |
992 | goto end; | |
993 | } | |
e4db5ace JR |
994 | if (!evaluation) { |
995 | /* Evaluation yielded nothing. Normal exit. */ | |
996 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
997 | ret = 0; | |
998 | goto end; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Create a temporary client list with the client currently | |
1003 | * subscribing. | |
1004 | */ | |
505b2d90 | 1005 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
e4db5ace JR |
1006 | CDS_INIT_LIST_HEAD(&client_list.list); |
1007 | client_list.trigger = trigger; | |
1008 | ||
1009 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1010 | client_list_element.client = client; | |
1011 | cds_list_add(&client_list_element.node, &client_list.list); | |
1012 | ||
1013 | /* Send evaluation result to the newly-subscribed client. */ | |
1014 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
1015 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 1016 | state, object_uid, object_gid); |
e4db5ace JR |
1017 | |
1018 | end: | |
1019 | return ret; | |
1020 | } | |
1021 | ||
ab0ee2ca JG |
1022 | static |
1023 | int notification_thread_client_subscribe(struct notification_client *client, | |
1024 | struct lttng_condition *condition, | |
1025 | struct notification_thread_state *state, | |
1026 | enum lttng_notification_channel_status *_status) | |
1027 | { | |
1028 | int ret = 0; | |
505b2d90 | 1029 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1030 | struct lttng_condition_list_element *condition_list_element = NULL; |
1031 | struct notification_client_list_element *client_list_element = NULL; | |
1032 | enum lttng_notification_channel_status status = | |
1033 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1034 | ||
1035 | /* | |
1036 | * Ensure that the client has not already subscribed to this condition | |
1037 | * before. | |
1038 | */ | |
1039 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1040 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1041 | condition)) { | |
1042 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1043 | goto end; | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1048 | if (!condition_list_element) { | |
1049 | ret = -1; | |
1050 | goto error; | |
1051 | } | |
1052 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1053 | if (!client_list_element) { | |
1054 | ret = -1; | |
1055 | goto error; | |
1056 | } | |
1057 | ||
ab0ee2ca JG |
1058 | /* |
1059 | * Add the newly-subscribed condition to the client's subscription list. | |
1060 | */ | |
1061 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1062 | condition_list_element->condition = condition; | |
1063 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
1064 | ||
ed327204 JG |
1065 | client_list = get_client_list_from_condition(state, condition); |
1066 | if (!client_list) { | |
2ae99f0b JG |
1067 | /* |
1068 | * No notification-emiting trigger registered with this | |
1069 | * condition. We don't evaluate the condition right away | |
1070 | * since this trigger is not registered yet. | |
1071 | */ | |
4fb43b68 | 1072 | free(client_list_element); |
505b2d90 | 1073 | goto end; |
ab0ee2ca JG |
1074 | } |
1075 | ||
2ae99f0b JG |
1076 | /* |
1077 | * The condition to which the client just subscribed is evaluated | |
1078 | * at this point so that conditions that are already TRUE result | |
1079 | * in a notification being sent out. | |
505b2d90 JG |
1080 | * |
1081 | * The client_list's trigger is used without locking the list itself. | |
1082 | * This is correct since the list doesn't own the trigger and the | |
1083 | * object is immutable. | |
2ae99f0b | 1084 | */ |
e4db5ace JR |
1085 | if (evaluate_condition_for_client(client_list->trigger, condition, |
1086 | client, state)) { | |
1087 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1088 | ret = -1; | |
4bd5b4af | 1089 | free(client_list_element); |
505b2d90 | 1090 | goto end; |
e4db5ace JR |
1091 | } |
1092 | ||
1093 | /* | |
1094 | * Add the client to the list of clients interested in a given trigger | |
1095 | * if a "notification" trigger with a corresponding condition was | |
1096 | * added prior. | |
1097 | */ | |
ab0ee2ca JG |
1098 | client_list_element->client = client; |
1099 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1100 | |
1101 | pthread_mutex_lock(&client_list->lock); | |
ab0ee2ca | 1102 | cds_list_add(&client_list_element->node, &client_list->list); |
505b2d90 | 1103 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1104 | end: |
1105 | if (_status) { | |
1106 | *_status = status; | |
1107 | } | |
505b2d90 JG |
1108 | if (client_list) { |
1109 | notification_client_list_put(client_list); | |
1110 | } | |
ab0ee2ca JG |
1111 | return ret; |
1112 | error: | |
1113 | free(condition_list_element); | |
1114 | free(client_list_element); | |
1115 | return ret; | |
1116 | } | |
1117 | ||
1118 | static | |
1119 | int notification_thread_client_unsubscribe( | |
1120 | struct notification_client *client, | |
1121 | struct lttng_condition *condition, | |
1122 | struct notification_thread_state *state, | |
1123 | enum lttng_notification_channel_status *_status) | |
1124 | { | |
ab0ee2ca JG |
1125 | struct notification_client_list *client_list; |
1126 | struct lttng_condition_list_element *condition_list_element, | |
1127 | *condition_tmp; | |
1128 | struct notification_client_list_element *client_list_element, | |
1129 | *client_tmp; | |
1130 | bool condition_found = false; | |
1131 | enum lttng_notification_channel_status status = | |
1132 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1133 | ||
1134 | /* Remove the condition from the client's condition list. */ | |
1135 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1136 | &client->condition_list, node) { | |
1137 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1138 | condition)) { | |
1139 | continue; | |
1140 | } | |
1141 | ||
1142 | cds_list_del(&condition_list_element->node); | |
1143 | /* | |
1144 | * The caller may be iterating on the client's conditions to | |
1145 | * tear down a client's connection. In this case, the condition | |
1146 | * will be destroyed at the end. | |
1147 | */ | |
1148 | if (condition != condition_list_element->condition) { | |
1149 | lttng_condition_destroy( | |
1150 | condition_list_element->condition); | |
1151 | } | |
1152 | free(condition_list_element); | |
1153 | condition_found = true; | |
1154 | break; | |
1155 | } | |
1156 | ||
1157 | if (!condition_found) { | |
1158 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1159 | goto end; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * Remove the client from the list of clients interested the trigger | |
1164 | * matching the condition. | |
1165 | */ | |
ed327204 JG |
1166 | client_list = get_client_list_from_condition(state, condition); |
1167 | if (!client_list) { | |
505b2d90 | 1168 | goto end; |
ab0ee2ca JG |
1169 | } |
1170 | ||
505b2d90 | 1171 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
1172 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
1173 | &client_list->list, node) { | |
505b2d90 | 1174 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1175 | continue; |
1176 | } | |
1177 | cds_list_del(&client_list_element->node); | |
1178 | free(client_list_element); | |
1179 | break; | |
1180 | } | |
505b2d90 JG |
1181 | pthread_mutex_unlock(&client_list->lock); |
1182 | notification_client_list_put(client_list); | |
1183 | client_list = NULL; | |
ab0ee2ca JG |
1184 | end: |
1185 | lttng_condition_destroy(condition); | |
1186 | if (_status) { | |
1187 | *_status = status; | |
1188 | } | |
1189 | return 0; | |
1190 | } | |
1191 | ||
83b934ad MD |
1192 | static |
1193 | void free_notification_client_rcu(struct rcu_head *node) | |
1194 | { | |
1195 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1196 | } | |
1197 | ||
ab0ee2ca JG |
1198 | static |
1199 | void notification_client_destroy(struct notification_client *client, | |
1200 | struct notification_thread_state *state) | |
1201 | { | |
ab0ee2ca JG |
1202 | if (!client) { |
1203 | return; | |
1204 | } | |
1205 | ||
505b2d90 JG |
1206 | /* |
1207 | * The client object is not reachable by other threads, no need to lock | |
1208 | * the client here. | |
1209 | */ | |
ab0ee2ca JG |
1210 | if (client->socket >= 0) { |
1211 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1212 | client->socket = -1; |
ab0ee2ca | 1213 | } |
505b2d90 | 1214 | client->communication.active = false; |
882093ee JR |
1215 | lttng_payload_reset(&client->communication.inbound.payload); |
1216 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1217 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1218 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1223 | * client pointer). | |
1224 | */ | |
1225 | static | |
1226 | struct notification_client *get_client_from_socket(int socket, | |
1227 | struct notification_thread_state *state) | |
1228 | { | |
1229 | struct cds_lfht_iter iter; | |
1230 | struct cds_lfht_node *node; | |
1231 | struct notification_client *client = NULL; | |
1232 | ||
1233 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1234 | hash_client_socket(socket), |
1235 | match_client_socket, | |
ab0ee2ca JG |
1236 | (void *) (unsigned long) socket, |
1237 | &iter); | |
1238 | node = cds_lfht_iter_get_node(&iter); | |
1239 | if (!node) { | |
1240 | goto end; | |
1241 | } | |
1242 | ||
1243 | client = caa_container_of(node, struct notification_client, | |
1244 | client_socket_ht_node); | |
1245 | end: | |
1246 | return client; | |
1247 | } | |
1248 | ||
f2b3ef9f JG |
1249 | /* |
1250 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1251 | * client pointer). | |
1252 | */ | |
1253 | static | |
1254 | struct notification_client *get_client_from_id(notification_client_id id, | |
1255 | struct notification_thread_state *state) | |
1256 | { | |
1257 | struct cds_lfht_iter iter; | |
1258 | struct cds_lfht_node *node; | |
1259 | struct notification_client *client = NULL; | |
1260 | ||
1261 | cds_lfht_lookup(state->client_id_ht, | |
1262 | hash_client_id(id), | |
1263 | match_client_id, | |
1264 | &id, | |
1265 | &iter); | |
1266 | node = cds_lfht_iter_get_node(&iter); | |
1267 | if (!node) { | |
1268 | goto end; | |
1269 | } | |
1270 | ||
1271 | client = caa_container_of(node, struct notification_client, | |
1272 | client_id_ht_node); | |
1273 | end: | |
1274 | return client; | |
1275 | } | |
1276 | ||
ab0ee2ca | 1277 | static |
e8360425 | 1278 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1279 | const struct lttng_condition *condition, |
1280 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1281 | { |
1282 | enum lttng_condition_status status; | |
e8360425 JD |
1283 | enum lttng_domain_type condition_domain; |
1284 | const char *condition_session_name = NULL; | |
1285 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1286 | |
e8360425 JD |
1287 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1288 | &condition_domain); | |
1289 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1290 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1291 | goto fail; |
1292 | } | |
1293 | ||
e8360425 JD |
1294 | status = lttng_condition_buffer_usage_get_session_name( |
1295 | condition, &condition_session_name); | |
1296 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1297 | ||
1298 | status = lttng_condition_buffer_usage_get_channel_name( | |
1299 | condition, &condition_channel_name); | |
1300 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1301 | ||
1302 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1303 | goto fail; | |
1304 | } | |
1305 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1306 | goto fail; |
1307 | } | |
1308 | ||
e8360425 JD |
1309 | return true; |
1310 | fail: | |
1311 | return false; | |
1312 | } | |
1313 | ||
1314 | static | |
1315 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1316 | const struct lttng_condition *condition, |
1317 | const struct channel_info *channel_info) | |
e8360425 JD |
1318 | { |
1319 | enum lttng_condition_status status; | |
1320 | const char *condition_session_name = NULL; | |
1321 | ||
1322 | status = lttng_condition_session_consumed_size_get_session_name( | |
1323 | condition, &condition_session_name); | |
1324 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1325 | ||
1326 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1327 | goto fail; |
1328 | } | |
1329 | ||
e8360425 JD |
1330 | return true; |
1331 | fail: | |
1332 | return false; | |
1333 | } | |
ab0ee2ca | 1334 | |
51eab943 JG |
1335 | static |
1336 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1337 | const struct channel_info *channel_info) | |
1338 | { | |
1339 | const struct lttng_condition *condition; | |
e8360425 | 1340 | bool trigger_applies; |
ab0ee2ca | 1341 | |
51eab943 | 1342 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1343 | if (!condition) { |
ab0ee2ca JG |
1344 | goto fail; |
1345 | } | |
e8360425 JD |
1346 | |
1347 | switch (lttng_condition_get_type(condition)) { | |
1348 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1349 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1350 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1351 | condition, channel_info); | |
1352 | break; | |
1353 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1354 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1355 | condition, channel_info); | |
1356 | break; | |
1357 | default: | |
ab0ee2ca JG |
1358 | goto fail; |
1359 | } | |
1360 | ||
e8360425 | 1361 | return trigger_applies; |
ab0ee2ca JG |
1362 | fail: |
1363 | return false; | |
1364 | } | |
1365 | ||
1366 | static | |
1367 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1368 | struct notification_client *client) | |
1369 | { | |
1370 | bool applies = false; | |
1371 | struct lttng_condition_list_element *condition_list_element; | |
1372 | ||
1373 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1374 | node) { | |
1375 | applies = lttng_condition_is_equal( | |
1376 | condition_list_element->condition, | |
1377 | lttng_trigger_get_condition(trigger)); | |
1378 | if (applies) { | |
1379 | break; | |
1380 | } | |
1381 | } | |
1382 | return applies; | |
1383 | } | |
1384 | ||
ed327204 JG |
1385 | /* Must be called with RCU read lock held. */ |
1386 | static | |
1387 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1388 | struct notification_thread_state *state, | |
1389 | const char *session_name) | |
1390 | { | |
1391 | struct lttng_session_trigger_list *list = NULL; | |
1392 | struct cds_lfht_node *node; | |
1393 | struct cds_lfht_iter iter; | |
1394 | ||
1395 | cds_lfht_lookup(state->session_triggers_ht, | |
1396 | hash_key_str(session_name, lttng_ht_seed), | |
1397 | match_session_trigger_list, | |
1398 | session_name, | |
1399 | &iter); | |
1400 | node = cds_lfht_iter_get_node(&iter); | |
1401 | if (!node) { | |
1402 | /* | |
1403 | * Not an error, the list of triggers applying to that session | |
1404 | * will be initialized when the session is created. | |
1405 | */ | |
1406 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1407 | session_name); | |
1408 | goto end; | |
1409 | } | |
1410 | ||
e742b055 | 1411 | list = caa_container_of(node, |
ed327204 JG |
1412 | struct lttng_session_trigger_list, |
1413 | session_triggers_ht_node); | |
1414 | end: | |
1415 | return list; | |
1416 | } | |
1417 | ||
ea9a44f0 JG |
1418 | /* |
1419 | * Allocate an empty lttng_session_trigger_list for the session named | |
1420 | * 'session_name'. | |
1421 | * | |
1422 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1423 | * It is the caller's responsability to ensure the session name is alive | |
1424 | * for as long as this list is. | |
1425 | */ | |
1426 | static | |
1427 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1428 | const char *session_name, | |
1429 | struct cds_lfht *session_triggers_ht) | |
1430 | { | |
1431 | struct lttng_session_trigger_list *list; | |
1432 | ||
1433 | list = zmalloc(sizeof(*list)); | |
1434 | if (!list) { | |
1435 | goto end; | |
1436 | } | |
1437 | list->session_name = session_name; | |
1438 | CDS_INIT_LIST_HEAD(&list->list); | |
1439 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1440 | list->session_triggers_ht = session_triggers_ht; | |
1441 | ||
1442 | rcu_read_lock(); | |
1443 | /* Publish the list through the session_triggers_ht. */ | |
1444 | cds_lfht_add(session_triggers_ht, | |
1445 | hash_key_str(session_name, lttng_ht_seed), | |
1446 | &list->session_triggers_ht_node); | |
1447 | rcu_read_unlock(); | |
1448 | end: | |
1449 | return list; | |
1450 | } | |
1451 | ||
1452 | static | |
1453 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1454 | { | |
1455 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1456 | rcu_node)); | |
1457 | } | |
1458 | ||
1459 | static | |
1460 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1461 | { | |
1462 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1463 | ||
1464 | /* Empty the list element by element, and then free the list itself. */ | |
1465 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1466 | &list->list, node) { | |
1467 | cds_list_del(&trigger_list_element->node); | |
1468 | free(trigger_list_element); | |
1469 | } | |
1470 | rcu_read_lock(); | |
1471 | /* Unpublish the list from the session_triggers_ht. */ | |
1472 | cds_lfht_del(list->session_triggers_ht, | |
1473 | &list->session_triggers_ht_node); | |
1474 | rcu_read_unlock(); | |
1475 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1476 | } | |
1477 | ||
1478 | static | |
1479 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1480 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1481 | { |
1482 | int ret = 0; | |
1483 | struct lttng_trigger_list_element *new_element = | |
1484 | zmalloc(sizeof(*new_element)); | |
1485 | ||
1486 | if (!new_element) { | |
1487 | ret = -1; | |
1488 | goto end; | |
1489 | } | |
1490 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1491 | new_element->trigger = trigger; | |
1492 | cds_list_add(&new_element->node, &list->list); | |
1493 | end: | |
1494 | return ret; | |
1495 | } | |
1496 | ||
1497 | static | |
1498 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1499 | const char *session_name) | |
1500 | { | |
1501 | bool applies = false; | |
1502 | const struct lttng_condition *condition; | |
1503 | ||
1504 | condition = lttng_trigger_get_const_condition(trigger); | |
1505 | switch (lttng_condition_get_type(condition)) { | |
1506 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1507 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1508 | { | |
1509 | enum lttng_condition_status condition_status; | |
1510 | const char *condition_session_name; | |
1511 | ||
1512 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1513 | condition, &condition_session_name); | |
1514 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1515 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1516 | goto end; | |
1517 | } | |
1518 | ||
1519 | assert(condition_session_name); | |
1520 | applies = !strcmp(condition_session_name, session_name); | |
1521 | break; | |
1522 | } | |
1523 | default: | |
1524 | goto end; | |
1525 | } | |
1526 | end: | |
1527 | return applies; | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1532 | * all triggers that apply to the session named 'session_name'. | |
1533 | * | |
1534 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1535 | * It is the caller's responsability to ensure the session name is alive | |
1536 | * for as long as this list is. | |
1537 | */ | |
1538 | static | |
1539 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1540 | const struct notification_thread_state *state, | |
1541 | const char *session_name) | |
1542 | { | |
1543 | int trigger_count = 0; | |
1544 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1545 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1546 | struct cds_lfht_iter iter; | |
1547 | ||
1548 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1549 | state->session_triggers_ht); | |
1550 | ||
1551 | /* Add all triggers applying to the session named 'session_name'. */ | |
1552 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1553 | node) { | |
1554 | int ret; | |
1555 | ||
1556 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1557 | session_name)) { | |
1558 | continue; | |
1559 | } | |
1560 | ||
1561 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1562 | trigger_ht_element->trigger); | |
1563 | if (ret) { | |
1564 | goto error; | |
1565 | } | |
1566 | ||
1567 | trigger_count++; | |
1568 | } | |
1569 | ||
1570 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1571 | trigger_count); | |
1572 | return session_trigger_list; | |
1573 | error: | |
1574 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1575 | return NULL; | |
1576 | } | |
1577 | ||
8abe313a JG |
1578 | static |
1579 | struct session_info *find_or_create_session_info( | |
1580 | struct notification_thread_state *state, | |
1581 | const char *name, uid_t uid, gid_t gid) | |
1582 | { | |
1583 | struct session_info *session = NULL; | |
1584 | struct cds_lfht_node *node; | |
1585 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1586 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1587 | |
1588 | rcu_read_lock(); | |
1589 | cds_lfht_lookup(state->sessions_ht, | |
1590 | hash_key_str(name, lttng_ht_seed), | |
1591 | match_session, | |
1592 | name, | |
1593 | &iter); | |
1594 | node = cds_lfht_iter_get_node(&iter); | |
1595 | if (node) { | |
1596 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1597 | name, uid, gid); | |
1598 | session = caa_container_of(node, struct session_info, | |
1599 | sessions_ht_node); | |
1600 | assert(session->uid == uid); | |
1601 | assert(session->gid == gid); | |
1eee26c5 JG |
1602 | session_info_get(session); |
1603 | goto end; | |
ea9a44f0 JG |
1604 | } |
1605 | ||
1606 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1607 | if (!trigger_list) { | |
1608 | goto error; | |
8abe313a JG |
1609 | } |
1610 | ||
1eee26c5 JG |
1611 | session = session_info_create(name, uid, gid, trigger_list, |
1612 | state->sessions_ht); | |
8abe313a JG |
1613 | if (!session) { |
1614 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1615 | name, uid, gid); | |
b248644d | 1616 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1617 | goto error; |
8abe313a | 1618 | } |
ea9a44f0 | 1619 | trigger_list = NULL; |
577983cb JG |
1620 | |
1621 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1622 | &session->sessions_ht_node); |
1eee26c5 | 1623 | end: |
8abe313a JG |
1624 | rcu_read_unlock(); |
1625 | return session; | |
ea9a44f0 JG |
1626 | error: |
1627 | rcu_read_unlock(); | |
1628 | session_info_put(session); | |
1629 | return NULL; | |
8abe313a JG |
1630 | } |
1631 | ||
ab0ee2ca JG |
1632 | static |
1633 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1634 | struct notification_thread_state *state, |
1635 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1636 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1637 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1638 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1639 | { |
1640 | struct cds_list_head trigger_list; | |
8abe313a JG |
1641 | struct channel_info *new_channel_info = NULL; |
1642 | struct channel_key channel_key = { | |
1643 | .key = channel_key_int, | |
1644 | .domain = channel_domain, | |
1645 | }; | |
ab0ee2ca JG |
1646 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1647 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1648 | int trigger_count = 0; | |
1649 | struct cds_lfht_iter iter; | |
8abe313a | 1650 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1651 | |
1652 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a | 1653 | channel_name, session_name, channel_key_int, |
526200e4 | 1654 | lttng_domain_type_str(channel_domain)); |
ab0ee2ca JG |
1655 | |
1656 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1657 | ||
8abe313a JG |
1658 | session_info = find_or_create_session_info(state, session_name, |
1659 | session_uid, session_gid); | |
1660 | if (!session_info) { | |
a9577b76 | 1661 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1662 | goto error; |
1663 | } | |
1664 | ||
8abe313a JG |
1665 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1666 | channel_capacity, session_info); | |
1667 | if (!new_channel_info) { | |
1668 | goto error; | |
1669 | } | |
ab0ee2ca | 1670 | |
83b934ad | 1671 | rcu_read_lock(); |
ab0ee2ca JG |
1672 | /* Build a list of all triggers applying to the new channel. */ |
1673 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1674 | node) { | |
1675 | struct lttng_trigger_list_element *new_element; | |
1676 | ||
1677 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1678 | new_channel_info)) { |
ab0ee2ca JG |
1679 | continue; |
1680 | } | |
1681 | ||
1682 | new_element = zmalloc(sizeof(*new_element)); | |
1683 | if (!new_element) { | |
83b934ad | 1684 | rcu_read_unlock(); |
ab0ee2ca JG |
1685 | goto error; |
1686 | } | |
1687 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1688 | new_element->trigger = trigger_ht_element->trigger; | |
1689 | cds_list_add(&new_element->node, &trigger_list); | |
1690 | trigger_count++; | |
1691 | } | |
83b934ad | 1692 | rcu_read_unlock(); |
ab0ee2ca JG |
1693 | |
1694 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1695 | trigger_count); | |
1696 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1697 | if (!channel_trigger_list) { | |
1698 | goto error; | |
1699 | } | |
8abe313a | 1700 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1701 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1702 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1703 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1704 | ||
1705 | rcu_read_lock(); | |
1706 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1707 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1708 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1709 | &new_channel_info->channels_ht_node); |
1710 | /* | |
1711 | * Add the list of triggers associated with this channel to the | |
1712 | * channel_triggers_ht. | |
1713 | */ | |
1714 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1715 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1716 | &channel_trigger_list->channel_triggers_ht_node); |
1717 | rcu_read_unlock(); | |
1eee26c5 | 1718 | session_info_put(session_info); |
ab0ee2ca JG |
1719 | *cmd_result = LTTNG_OK; |
1720 | return 0; | |
1721 | error: | |
ab0ee2ca | 1722 | channel_info_destroy(new_channel_info); |
8abe313a | 1723 | session_info_put(session_info); |
ab0ee2ca JG |
1724 | return 1; |
1725 | } | |
1726 | ||
83b934ad MD |
1727 | static |
1728 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1729 | { | |
1730 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1731 | rcu_node)); | |
1732 | } | |
1733 | ||
1734 | static | |
1735 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1736 | { | |
1737 | free(caa_container_of(node, struct channel_state_sample, | |
1738 | rcu_node)); | |
1739 | } | |
1740 | ||
ab0ee2ca JG |
1741 | static |
1742 | int handle_notification_thread_command_remove_channel( | |
1743 | struct notification_thread_state *state, | |
1744 | uint64_t channel_key, enum lttng_domain_type domain, | |
1745 | enum lttng_error_code *cmd_result) | |
1746 | { | |
1747 | struct cds_lfht_node *node; | |
1748 | struct cds_lfht_iter iter; | |
1749 | struct lttng_channel_trigger_list *trigger_list; | |
1750 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1751 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1752 | struct channel_info *channel_info; | |
1753 | ||
1754 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
526200e4 | 1755 | channel_key, lttng_domain_type_str(domain)); |
ab0ee2ca JG |
1756 | |
1757 | rcu_read_lock(); | |
1758 | ||
1759 | cds_lfht_lookup(state->channel_triggers_ht, | |
1760 | hash_channel_key(&key), | |
1761 | match_channel_trigger_list, | |
1762 | &key, | |
1763 | &iter); | |
1764 | node = cds_lfht_iter_get_node(&iter); | |
1765 | /* | |
1766 | * There is a severe internal error if we are being asked to remove a | |
1767 | * channel that doesn't exist. | |
1768 | */ | |
1769 | if (!node) { | |
1770 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1771 | goto end; | |
1772 | } | |
1773 | ||
1774 | /* Free the list of triggers associated with this channel. */ | |
1775 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1776 | channel_triggers_ht_node); | |
1777 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1778 | &trigger_list->list, node) { | |
1779 | cds_list_del(&trigger_list_element->node); | |
1780 | free(trigger_list_element); | |
1781 | } | |
1782 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1783 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1784 | |
1785 | /* Free sampled channel state. */ | |
1786 | cds_lfht_lookup(state->channel_state_ht, | |
1787 | hash_channel_key(&key), | |
1788 | match_channel_state_sample, | |
1789 | &key, | |
1790 | &iter); | |
1791 | node = cds_lfht_iter_get_node(&iter); | |
1792 | /* | |
1793 | * This is expected to be NULL if the channel is destroyed before we | |
1794 | * received a sample. | |
1795 | */ | |
1796 | if (node) { | |
1797 | struct channel_state_sample *sample = caa_container_of(node, | |
1798 | struct channel_state_sample, | |
1799 | channel_state_ht_node); | |
1800 | ||
1801 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1802 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1803 | } |
1804 | ||
1805 | /* Remove the channel from the channels_ht and free it. */ | |
1806 | cds_lfht_lookup(state->channels_ht, | |
1807 | hash_channel_key(&key), | |
1808 | match_channel_info, | |
1809 | &key, | |
1810 | &iter); | |
1811 | node = cds_lfht_iter_get_node(&iter); | |
1812 | assert(node); | |
1813 | channel_info = caa_container_of(node, struct channel_info, | |
1814 | channels_ht_node); | |
1815 | cds_lfht_del(state->channels_ht, node); | |
1816 | channel_info_destroy(channel_info); | |
1817 | end: | |
1818 | rcu_read_unlock(); | |
1819 | *cmd_result = LTTNG_OK; | |
1820 | return 0; | |
1821 | } | |
1822 | ||
0ca52944 | 1823 | static |
ed327204 | 1824 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1825 | struct notification_thread_state *state, |
ed327204 JG |
1826 | enum notification_thread_command_type cmd_type, |
1827 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1828 | uint64_t trace_archive_chunk_id, | |
1829 | struct lttng_trace_archive_location *location, | |
1830 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1831 | { |
ed327204 JG |
1832 | int ret = 0; |
1833 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1834 | struct lttng_session_trigger_list *trigger_list; | |
1835 | struct lttng_trigger_list_element *trigger_list_element; | |
1836 | struct session_info *session_info; | |
f2b3ef9f | 1837 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1838 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1839 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1840 | }; |
0ca52944 | 1841 | |
ed327204 JG |
1842 | rcu_read_lock(); |
1843 | ||
1844 | session_info = find_or_create_session_info(state, session_name, | |
1845 | session_uid, session_gid); | |
1846 | if (!session_info) { | |
a9577b76 | 1847 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1848 | ret = -1; |
1849 | cmd_result = LTTNG_ERR_NOMEM; | |
1850 | goto end; | |
1851 | } | |
1852 | ||
1853 | session_info->rotation.ongoing = | |
1854 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1855 | session_info->rotation.id = trace_archive_chunk_id; | |
1856 | trigger_list = get_session_trigger_list(state, session_name); | |
1857 | if (!trigger_list) { | |
1858 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1859 | session_name); | |
1860 | goto end; | |
1861 | } | |
1862 | ||
1863 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1864 | node) { | |
1865 | const struct lttng_condition *condition; | |
f2b3ef9f | 1866 | struct lttng_trigger *trigger; |
ed327204 JG |
1867 | struct notification_client_list *client_list; |
1868 | struct lttng_evaluation *evaluation = NULL; | |
1869 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1870 | enum action_executor_status executor_status; |
ed327204 JG |
1871 | |
1872 | trigger = trigger_list_element->trigger; | |
1873 | condition = lttng_trigger_get_const_condition(trigger); | |
1874 | assert(condition); | |
1875 | condition_type = lttng_condition_get_type(condition); | |
1876 | ||
1877 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1878 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1879 | continue; | |
1880 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1881 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1882 | continue; | |
1883 | } | |
1884 | ||
ed327204 | 1885 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1886 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1887 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1888 | trace_archive_chunk_id); | |
1889 | } else { | |
1890 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1891 | trace_archive_chunk_id, location); | |
1892 | } | |
1893 | ||
1894 | if (!evaluation) { | |
1895 | /* Internal error */ | |
1896 | ret = -1; | |
1897 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1898 | goto put_list; |
ed327204 JG |
1899 | } |
1900 | ||
f2b3ef9f JG |
1901 | /* |
1902 | * Ownership of `evaluation` transferred to the action executor | |
1903 | * no matter the result. | |
1904 | */ | |
1905 | executor_status = action_executor_enqueue(state->executor, | |
1906 | trigger, evaluation, &session_creds, | |
1907 | client_list); | |
1908 | evaluation = NULL; | |
1909 | switch (executor_status) { | |
1910 | case ACTION_EXECUTOR_STATUS_OK: | |
1911 | break; | |
1912 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1913 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1914 | /* | |
1915 | * TODO Add trigger identification (name/id) when | |
1916 | * it is added to the API. | |
1917 | */ | |
1918 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1919 | ret = -1; | |
1920 | goto put_list; | |
1921 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1922 | /* | |
1923 | * TODO Add trigger identification (name/id) when | |
1924 | * it is added to the API. | |
1925 | * | |
1926 | * Not a fatal error. | |
1927 | */ | |
1928 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1929 | ret = 0; | |
1930 | goto put_list; | |
1931 | default: | |
1932 | abort(); | |
1933 | } | |
1934 | ||
505b2d90 JG |
1935 | put_list: |
1936 | notification_client_list_put(client_list); | |
ed327204 | 1937 | if (caa_unlikely(ret)) { |
505b2d90 | 1938 | break; |
ed327204 JG |
1939 | } |
1940 | } | |
1941 | end: | |
1942 | session_info_put(session_info); | |
1943 | *_cmd_result = cmd_result; | |
1944 | rcu_read_unlock(); | |
1945 | return ret; | |
0ca52944 JG |
1946 | } |
1947 | ||
d02d7404 JR |
1948 | static |
1949 | int handle_notification_thread_command_add_tracer_event_source( | |
1950 | struct notification_thread_state *state, | |
1951 | int tracer_event_source_fd, | |
1952 | enum lttng_domain_type domain_type, | |
1953 | enum lttng_error_code *_cmd_result) | |
1954 | { | |
1955 | int ret = 0; | |
1956 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1957 | struct notification_event_tracer_event_source_element *element = NULL; | |
1958 | ||
1959 | element = zmalloc(sizeof(*element)); | |
1960 | if (!element) { | |
1961 | cmd_result = LTTNG_ERR_NOMEM; | |
1962 | ret = -1; | |
1963 | goto end; | |
1964 | } | |
1965 | ||
d02d7404 JR |
1966 | element->fd = tracer_event_source_fd; |
1967 | element->domain = domain_type; | |
1968 | ||
1969 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
1970 | ||
1971 | DBG3("[notification-thread] Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1972 | tracer_event_source_fd, | |
1973 | lttng_domain_type_str(domain_type)); | |
1974 | ||
1975 | /* Adding the read side pipe to the event poll. */ | |
1976 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLIN | LPOLLERR); | |
1977 | if (ret < 0) { | |
1978 | ERR("[notification-thread] Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1979 | tracer_event_source_fd, | |
1980 | lttng_domain_type_str(element->domain)); | |
1981 | cds_list_del(&element->node); | |
1982 | free(element); | |
1983 | goto end; | |
1984 | } | |
1985 | ||
1986 | element->is_fd_in_poll_set = true; | |
1987 | ||
1988 | end: | |
1989 | *_cmd_result = cmd_result; | |
1990 | return ret; | |
1991 | } | |
1992 | ||
8b524060 FD |
1993 | static |
1994 | int drain_event_notifier_notification_pipe( | |
1995 | struct notification_thread_state *state, | |
1996 | int pipe, enum lttng_domain_type domain) | |
1997 | { | |
1998 | struct lttng_poll_event events = {0}; | |
1999 | int ret; | |
2000 | ||
2001 | ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC); | |
2002 | if (ret < 0) { | |
2003 | ERR("[notification-thread] Error creating lttng_poll_event"); | |
2004 | goto end; | |
2005 | } | |
2006 | ||
2007 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2008 | if (ret < 0) { | |
2009 | ERR("[notification-thread] Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", | |
2010 | pipe); | |
2011 | goto end; | |
2012 | } | |
2013 | ||
2014 | while (true) { | |
2015 | /* | |
2016 | * Continue to consume notifications as long as there are new | |
2017 | * ones coming in. The tracer has been asked to stop producing | |
2018 | * them. | |
2019 | * | |
2020 | * LPOLLIN is explicitly checked since LPOLLHUP is implicitly | |
2021 | * monitored (on Linux, at least) and will be returned when | |
2022 | * the pipe is closed but empty. | |
2023 | */ | |
2024 | ret = lttng_poll_wait_interruptible(&events, 0); | |
a17b133b | 2025 | if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) { |
8b524060 FD |
2026 | /* No more notification to be read on this pipe. */ |
2027 | ret = 0; | |
2028 | goto end; | |
2029 | } else if (ret < 0) { | |
2030 | PERROR("Failed on lttng_poll_wait_interruptible() call"); | |
2031 | ret = -1; | |
2032 | goto end; | |
2033 | } | |
2034 | ||
2035 | ret = handle_one_event_notifier_notification(state, pipe, domain); | |
2036 | if (ret) { | |
2037 | ERR("[notification-thread] Error consuming an event notifier notification from pipe: fd = %d", | |
2038 | pipe); | |
2039 | } | |
2040 | } | |
2041 | end: | |
2042 | lttng_poll_clean(&events); | |
2043 | return ret; | |
2044 | } | |
2045 | ||
d02d7404 JR |
2046 | static |
2047 | int handle_notification_thread_command_remove_tracer_event_source( | |
2048 | struct notification_thread_state *state, | |
2049 | int tracer_event_source_fd, | |
2050 | enum lttng_error_code *_cmd_result) | |
2051 | { | |
2052 | int ret = 0; | |
2fb5e9b7 | 2053 | bool found = false; |
d02d7404 JR |
2054 | enum lttng_error_code cmd_result = LTTNG_OK; |
2055 | struct notification_event_tracer_event_source_element *source_element = NULL, *tmp; | |
2056 | ||
2057 | cds_list_for_each_entry_safe(source_element, tmp, | |
2058 | &state->tracer_event_sources_list, node) { | |
2059 | if (source_element->fd != tracer_event_source_fd) { | |
2060 | continue; | |
2061 | } | |
2062 | ||
2063 | DBG("[notification-thread] Removed tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2064 | tracer_event_source_fd, | |
2065 | lttng_domain_type_str(source_element->domain)); | |
2066 | cds_list_del(&source_element->node); | |
2fb5e9b7 | 2067 | found = true; |
d02d7404 JR |
2068 | break; |
2069 | } | |
2070 | ||
2fb5e9b7 JG |
2071 | if (!found) { |
2072 | /* | |
2073 | * This is temporarily allowed since the poll activity set is | |
2074 | * not properly cleaned-up for the moment. This is adressed in | |
2075 | * an upcoming fix. | |
2076 | */ | |
2077 | source_element = NULL; | |
2078 | goto end; | |
2079 | } | |
d02d7404 JR |
2080 | |
2081 | if (!source_element->is_fd_in_poll_set) { | |
2082 | /* Skip the poll set removal. */ | |
2083 | goto end; | |
2084 | } | |
2085 | ||
2086 | DBG3("[notification-thread] Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2087 | tracer_event_source_fd, | |
2088 | lttng_domain_type_str(source_element->domain)); | |
2089 | ||
2090 | /* Removing the fd from the event poll set. */ | |
2091 | ret = lttng_poll_del(&state->events, tracer_event_source_fd); | |
2092 | if (ret < 0) { | |
2093 | ERR("[notification-thread] Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2094 | tracer_event_source_fd, | |
2095 | lttng_domain_type_str(source_element->domain)); | |
2096 | cmd_result = LTTNG_ERR_FATAL; | |
2097 | goto end; | |
2098 | } | |
2099 | ||
173900f6 JG |
2100 | source_element->is_fd_in_poll_set = false; |
2101 | ||
8b524060 FD |
2102 | ret = drain_event_notifier_notification_pipe(state, tracer_event_source_fd, |
2103 | source_element->domain); | |
2104 | if (ret) { | |
2105 | ERR("[notification-thread] Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", | |
2106 | tracer_event_source_fd, | |
2107 | lttng_domain_type_str(source_element->domain)); | |
2108 | cmd_result = LTTNG_ERR_FATAL; | |
2109 | goto end; | |
2110 | } | |
2111 | ||
2112 | /* | |
2113 | * The drain_event_notifier_notification_pipe() call might have read | |
2114 | * data from an fd that we received in event in the latest _poll_wait() | |
2115 | * call. Make sure the thread call poll_wait() again to ensure we have | |
2116 | * a clean state. | |
2117 | */ | |
2118 | state->restart_poll = true; | |
2119 | ||
d02d7404 JR |
2120 | end: |
2121 | free(source_element); | |
2122 | *_cmd_result = cmd_result; | |
2123 | return ret; | |
2124 | } | |
2125 | ||
2126 | int handle_notification_thread_remove_tracer_event_source_no_result( | |
2127 | struct notification_thread_state *state, | |
2128 | int tracer_event_source_fd) | |
2129 | { | |
2130 | int ret; | |
2131 | enum lttng_error_code cmd_result; | |
2132 | ||
2133 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2134 | state, tracer_event_source_fd, &cmd_result); | |
2135 | (void) cmd_result; | |
2136 | return ret; | |
2137 | } | |
2138 | ||
fbc9f37d JR |
2139 | static int handle_notification_thread_command_list_triggers( |
2140 | struct notification_thread_handle *handle, | |
2141 | struct notification_thread_state *state, | |
2142 | uid_t client_uid, | |
2143 | struct lttng_triggers **triggers, | |
2144 | enum lttng_error_code *_cmd_result) | |
2145 | { | |
2146 | int ret = 0; | |
2147 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2148 | struct cds_lfht_iter iter; | |
2149 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2150 | struct lttng_triggers *local_triggers = NULL; | |
2151 | const struct lttng_credentials *creds; | |
2152 | ||
2153 | rcu_read_lock(); | |
2154 | ||
2155 | local_triggers = lttng_triggers_create(); | |
2156 | if (!local_triggers) { | |
2157 | /* Not a fatal error. */ | |
2158 | cmd_result = LTTNG_ERR_NOMEM; | |
2159 | goto end; | |
2160 | } | |
2161 | ||
2162 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2163 | trigger_ht_element, node) { | |
2164 | /* | |
2165 | * Only return the triggers to which the client has access. | |
2166 | * The root user has visibility over all triggers. | |
2167 | */ | |
2168 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2169 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2170 | continue; | |
2171 | } | |
2172 | ||
2173 | ret = lttng_triggers_add(local_triggers, | |
2174 | trigger_ht_element->trigger); | |
2175 | if (ret < 0) { | |
2176 | /* Not a fatal error. */ | |
2177 | ret = 0; | |
2178 | cmd_result = LTTNG_ERR_NOMEM; | |
2179 | goto end; | |
2180 | } | |
2181 | } | |
2182 | ||
2183 | /* Transferring ownership to the caller. */ | |
2184 | *triggers = local_triggers; | |
2185 | local_triggers = NULL; | |
2186 | ||
2187 | end: | |
2188 | rcu_read_unlock(); | |
2189 | lttng_triggers_destroy(local_triggers); | |
2190 | *_cmd_result = cmd_result; | |
2191 | return ret; | |
2192 | } | |
2193 | ||
1da26331 | 2194 | static |
959e3c66 | 2195 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2196 | { |
959e3c66 | 2197 | bool is_supported; |
1da26331 JG |
2198 | |
2199 | switch (lttng_condition_get_type(condition)) { | |
2200 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2201 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2202 | { | |
959e3c66 | 2203 | int ret; |
1da26331 JG |
2204 | enum lttng_domain_type domain; |
2205 | ||
2206 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2207 | &domain); | |
959e3c66 | 2208 | assert(ret == 0); |
1da26331 JG |
2209 | |
2210 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2211 | is_supported = true; |
1da26331 JG |
2212 | goto end; |
2213 | } | |
2214 | ||
2215 | /* | |
2216 | * Older kernel tracers don't expose the API to monitor their | |
2217 | * buffers. Therefore, we reject triggers that require that | |
2218 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2219 | * |
2220 | * Assume unsupported on error. | |
1da26331 | 2221 | */ |
959e3c66 JR |
2222 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2223 | break; | |
2224 | } | |
d602bd6a | 2225 | case LTTNG_CONDITION_TYPE_ON_EVENT: |
959e3c66 JR |
2226 | { |
2227 | const struct lttng_event_rule *event_rule; | |
2228 | enum lttng_domain_type domain; | |
2229 | const enum lttng_condition_status status = | |
d602bd6a | 2230 | lttng_condition_on_event_get_rule( |
959e3c66 JR |
2231 | condition, &event_rule); |
2232 | ||
2233 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
2234 | ||
2235 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2236 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2237 | is_supported = true; | |
2238 | goto end; | |
2239 | } | |
2240 | ||
2241 | /* | |
2242 | * Older kernel tracers can't emit notification. Therefore, we | |
2243 | * reject triggers that require that mechanism to be available | |
2244 | * to be evaluated. | |
2245 | * | |
2246 | * Assume unsupported on error. | |
2247 | */ | |
2248 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2249 | break; |
2250 | } | |
2251 | default: | |
959e3c66 | 2252 | is_supported = true; |
1da26331 JG |
2253 | } |
2254 | end: | |
959e3c66 | 2255 | return is_supported; |
1da26331 JG |
2256 | } |
2257 | ||
51eab943 JG |
2258 | /* Must be called with RCU read lock held. */ |
2259 | static | |
f2b3ef9f | 2260 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2261 | struct notification_thread_state *state) |
2262 | { | |
2263 | int ret = 0; | |
51eab943 JG |
2264 | const struct lttng_condition *condition; |
2265 | const char *session_name; | |
2266 | struct lttng_session_trigger_list *trigger_list; | |
2267 | ||
2268 | condition = lttng_trigger_get_const_condition(trigger); | |
2269 | switch (lttng_condition_get_type(condition)) { | |
2270 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2271 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2272 | { | |
2273 | enum lttng_condition_status status; | |
2274 | ||
2275 | status = lttng_condition_session_rotation_get_session_name( | |
2276 | condition, &session_name); | |
2277 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
2278 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
2279 | ret = -1; | |
2280 | goto end; | |
2281 | } | |
2282 | break; | |
2283 | } | |
2284 | default: | |
2285 | ret = -1; | |
2286 | goto end; | |
2287 | } | |
2288 | ||
ed327204 JG |
2289 | trigger_list = get_session_trigger_list(state, session_name); |
2290 | if (!trigger_list) { | |
51eab943 JG |
2291 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
2292 | session_name); | |
2293 | goto end; | |
51eab943 | 2294 | |
ed327204 | 2295 | } |
51eab943 JG |
2296 | |
2297 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
2298 | session_name); | |
2299 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2300 | end: | |
2301 | return ret; | |
2302 | } | |
2303 | ||
2304 | /* Must be called with RCU read lock held. */ | |
2305 | static | |
f2b3ef9f | 2306 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2307 | struct notification_thread_state *state) |
2308 | { | |
2309 | int ret = 0; | |
2310 | struct cds_lfht_node *node; | |
2311 | struct cds_lfht_iter iter; | |
2312 | struct channel_info *channel; | |
2313 | ||
2314 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2315 | channels_ht_node) { | |
2316 | struct lttng_trigger_list_element *trigger_list_element; | |
2317 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2318 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2319 | |
2320 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2321 | continue; | |
2322 | } | |
2323 | ||
2324 | cds_lfht_lookup(state->channel_triggers_ht, | |
2325 | hash_channel_key(&channel->key), | |
2326 | match_channel_trigger_list, | |
2327 | &channel->key, | |
a5d64ae7 MD |
2328 | &lookup_iter); |
2329 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2330 | assert(node); |
2331 | trigger_list = caa_container_of(node, | |
2332 | struct lttng_channel_trigger_list, | |
2333 | channel_triggers_ht_node); | |
2334 | ||
2335 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2336 | if (!trigger_list_element) { | |
2337 | ret = -1; | |
2338 | goto end; | |
2339 | } | |
2340 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2341 | trigger_list_element->trigger = trigger; | |
2342 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2343 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2344 | channel->name); | |
2345 | } | |
2346 | end: | |
2347 | return ret; | |
2348 | } | |
2349 | ||
f2b3ef9f JG |
2350 | static |
2351 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2352 | { | |
2353 | bool is_notify = false; | |
2354 | unsigned int i, count; | |
2355 | enum lttng_action_status action_status; | |
2356 | const struct lttng_action *action = | |
2357 | lttng_trigger_get_const_action(trigger); | |
2358 | enum lttng_action_type action_type; | |
2359 | ||
2360 | assert(action); | |
17182cfd | 2361 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2362 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2363 | is_notify = true; | |
2364 | goto end; | |
2365 | } else if (action_type != LTTNG_ACTION_TYPE_GROUP) { | |
2366 | goto end; | |
2367 | } | |
2368 | ||
2369 | action_status = lttng_action_group_get_count(action, &count); | |
2370 | assert(action_status == LTTNG_ACTION_STATUS_OK); | |
2371 | ||
2372 | for (i = 0; i < count; i++) { | |
2373 | const struct lttng_action *inner_action = | |
2374 | lttng_action_group_get_at_index( | |
2375 | action, i); | |
2376 | ||
17182cfd | 2377 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2378 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2379 | is_notify = true; | |
2380 | goto end; | |
2381 | } | |
2382 | } | |
2383 | ||
2384 | end: | |
2385 | return is_notify; | |
2386 | } | |
2387 | ||
242388e4 JR |
2388 | static bool trigger_name_taken(struct notification_thread_state *state, |
2389 | const struct lttng_trigger *trigger) | |
2390 | { | |
2391 | struct cds_lfht_iter iter; | |
2392 | ||
2393 | /* | |
2394 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2395 | * The match is done against the trigger name and uid. | |
2396 | */ | |
2397 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2398 | hash_trigger_by_name_uid(trigger), | |
2399 | match_trigger_by_name_uid, | |
2400 | trigger, | |
2401 | &iter); | |
2402 | return !!cds_lfht_iter_get_node(&iter); | |
2403 | } | |
2404 | ||
2405 | static | |
2406 | enum lttng_error_code generate_trigger_name( | |
2407 | struct notification_thread_state *state, | |
2408 | struct lttng_trigger *trigger, const char **name) | |
2409 | { | |
2410 | enum lttng_error_code ret_code = LTTNG_OK; | |
2411 | bool taken = false; | |
2412 | enum lttng_trigger_status status; | |
2413 | ||
2414 | do { | |
2415 | const int ret = lttng_trigger_generate_name(trigger, | |
2416 | state->trigger_id.name_offset++); | |
2417 | if (ret) { | |
2418 | /* The only reason this can fail right now. */ | |
2419 | ret_code = LTTNG_ERR_NOMEM; | |
2420 | break; | |
2421 | } | |
2422 | ||
2423 | status = lttng_trigger_get_name(trigger, name); | |
2424 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
2425 | ||
2426 | taken = trigger_name_taken(state, trigger); | |
2427 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2428 | ||
2429 | return ret_code; | |
2430 | } | |
2431 | ||
ab0ee2ca | 2432 | /* |
f2b3ef9f | 2433 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2434 | * |
1da26331 | 2435 | * The effects of this are benign since: |
ab0ee2ca | 2436 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2437 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2438 | * - The notifications will not be sent since the client's credentials |
2439 | * are checked against the channel at that moment. | |
1da26331 JG |
2440 | * |
2441 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2442 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2443 | * |
2444 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2445 | * error code. | |
ab0ee2ca JG |
2446 | */ |
2447 | static | |
2448 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2449 | struct notification_thread_state *state, |
2450 | struct lttng_trigger *trigger, | |
2451 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
2452 | { |
2453 | int ret = 0; | |
2454 | struct lttng_condition *condition; | |
2455 | struct notification_client *client; | |
2456 | struct notification_client_list *client_list = NULL; | |
2457 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
f2b3ef9f | 2458 | struct notification_client_list_element *client_list_element; |
e7c93cf9 | 2459 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; |
ab0ee2ca JG |
2460 | struct cds_lfht_node *node; |
2461 | struct cds_lfht_iter iter; | |
242388e4 | 2462 | const char* trigger_name; |
ab0ee2ca | 2463 | bool free_trigger = true; |
f2b3ef9f JG |
2464 | struct lttng_evaluation *evaluation = NULL; |
2465 | struct lttng_credentials object_creds; | |
ff588497 JR |
2466 | uid_t object_uid; |
2467 | gid_t object_gid; | |
f2b3ef9f | 2468 | enum action_executor_status executor_status; |
e6887944 JR |
2469 | const uint64_t trigger_tracer_token = |
2470 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2471 | |
2472 | rcu_read_lock(); | |
2473 | ||
e6887944 JR |
2474 | /* Set the trigger's tracer token. */ |
2475 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2476 | ||
242388e4 JR |
2477 | if (lttng_trigger_get_name(trigger, &trigger_name) == |
2478 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2479 | const enum lttng_error_code ret_code = generate_trigger_name( | |
2480 | state, trigger, &trigger_name); | |
2481 | ||
2482 | if (ret_code != LTTNG_OK) { | |
2483 | /* Fatal error. */ | |
2484 | ret = -1; | |
2485 | *cmd_result = ret_code; | |
2486 | goto error; | |
2487 | } | |
2488 | } else if (trigger_name_taken(state, trigger)) { | |
2489 | /* Not a fatal error. */ | |
2490 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2491 | ret = 0; | |
2492 | goto error; | |
2493 | } | |
2494 | ||
ab0ee2ca | 2495 | condition = lttng_trigger_get_condition(trigger); |
1da26331 JG |
2496 | assert(condition); |
2497 | ||
959e3c66 JR |
2498 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2499 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2500 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2501 | goto error; | |
1da26331 JG |
2502 | } |
2503 | ||
ab0ee2ca JG |
2504 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2505 | if (!trigger_ht_element) { | |
2506 | ret = -1; | |
2507 | goto error; | |
2508 | } | |
2509 | ||
2510 | /* Add trigger to the trigger_ht. */ | |
2511 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2512 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2513 | trigger_ht_element->trigger = trigger; |
2514 | ||
2515 | node = cds_lfht_add_unique(state->triggers_ht, | |
2516 | lttng_condition_hash(condition), | |
242388e4 JR |
2517 | match_trigger, |
2518 | trigger, | |
ab0ee2ca JG |
2519 | &trigger_ht_element->node); |
2520 | if (node != &trigger_ht_element->node) { | |
2521 | /* Not a fatal error, simply report it to the client. */ | |
2522 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2523 | goto error_free_ht_element; | |
2524 | } | |
2525 | ||
242388e4 JR |
2526 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2527 | hash_trigger_by_name_uid(trigger), | |
2528 | match_trigger_by_name_uid, | |
2529 | trigger, | |
2530 | &trigger_ht_element->node_by_name_uid); | |
2531 | if (node != &trigger_ht_element->node_by_name_uid) { | |
2532 | /* Not a fatal error, simply report it to the client. */ | |
2533 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2534 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2535 | goto error_free_ht_element; | |
2536 | } | |
2537 | ||
d602bd6a | 2538 | if (lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT) { |
e7c93cf9 JR |
2539 | trigger_tokens_ht_element = zmalloc(sizeof(*trigger_tokens_ht_element)); |
2540 | if (!trigger_tokens_ht_element) { | |
2541 | /* Fatal error. */ | |
2542 | ret = -1; | |
2543 | cds_lfht_del(state->triggers_ht, | |
2544 | &trigger_ht_element->node); | |
2545 | cds_lfht_del(state->triggers_by_name_uid_ht, | |
2546 | &trigger_ht_element->node_by_name_uid); | |
2547 | goto error_free_ht_element; | |
2548 | } | |
2549 | ||
2550 | /* Add trigger token to the trigger_tokens_ht. */ | |
2551 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2552 | trigger_tokens_ht_element->token = | |
2553 | LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2554 | trigger_tokens_ht_element->trigger = trigger; | |
2555 | ||
2556 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2557 | hash_key_u64(&trigger_tokens_ht_element->token, | |
2558 | lttng_ht_seed), | |
2559 | match_trigger_token, | |
2560 | &trigger_tokens_ht_element->token, | |
2561 | &trigger_tokens_ht_element->node); | |
2562 | if (node != &trigger_tokens_ht_element->node) { | |
2563 | /* Internal corruption, fatal error. */ | |
2564 | ret = -1; | |
2565 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2566 | cds_lfht_del(state->triggers_ht, | |
2567 | &trigger_ht_element->node); | |
2568 | cds_lfht_del(state->triggers_by_name_uid_ht, | |
2569 | &trigger_ht_element->node_by_name_uid); | |
2570 | goto error_free_ht_element; | |
2571 | } | |
2572 | } | |
2573 | ||
ab0ee2ca JG |
2574 | /* |
2575 | * Ownership of the trigger and of its wrapper was transfered to | |
e7c93cf9 | 2576 | * the triggers_ht. Same for token ht element if necessary. |
ab0ee2ca | 2577 | */ |
e7c93cf9 | 2578 | trigger_tokens_ht_element = NULL; |
ab0ee2ca JG |
2579 | trigger_ht_element = NULL; |
2580 | free_trigger = false; | |
2581 | ||
2582 | /* | |
2583 | * The rest only applies to triggers that have a "notify" action. | |
2584 | * It is not skipped as this is the only action type currently | |
2585 | * supported. | |
2586 | */ | |
f2b3ef9f JG |
2587 | if (is_trigger_action_notify(trigger)) { |
2588 | client_list = notification_client_list_create(trigger); | |
2589 | if (!client_list) { | |
2590 | ret = -1; | |
2591 | goto error_free_ht_element; | |
ab0ee2ca JG |
2592 | } |
2593 | ||
f2b3ef9f JG |
2594 | /* Build a list of clients to which this new trigger applies. */ |
2595 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
2596 | client_socket_ht_node) { | |
2597 | if (!trigger_applies_to_client(trigger, client)) { | |
2598 | continue; | |
2599 | } | |
2600 | ||
2601 | client_list_element = | |
2602 | zmalloc(sizeof(*client_list_element)); | |
2603 | if (!client_list_element) { | |
2604 | ret = -1; | |
2605 | goto error_put_client_list; | |
2606 | } | |
2607 | ||
2608 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
2609 | client_list_element->client = client; | |
2610 | cds_list_add(&client_list_element->node, | |
2611 | &client_list->list); | |
ab0ee2ca | 2612 | } |
f2b3ef9f JG |
2613 | |
2614 | /* | |
2615 | * Client list ownership transferred to the | |
2616 | * notification_trigger_clients_ht. | |
2617 | */ | |
2618 | publish_notification_client_list(state, client_list); | |
ab0ee2ca JG |
2619 | } |
2620 | ||
f82f93a1 | 2621 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2622 | case LTTNG_OBJECT_TYPE_SESSION: |
2623 | /* Add the trigger to the list if it matches a known session. */ | |
2624 | ret = bind_trigger_to_matching_session(trigger, state); | |
2625 | if (ret) { | |
505b2d90 | 2626 | goto error_put_client_list; |
ab0ee2ca | 2627 | } |
f82f93a1 | 2628 | break; |
51eab943 JG |
2629 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2630 | /* | |
2631 | * Add the trigger to list of triggers bound to the channels | |
2632 | * currently known. | |
2633 | */ | |
2634 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2635 | if (ret) { | |
505b2d90 | 2636 | goto error_put_client_list; |
ab0ee2ca | 2637 | } |
51eab943 JG |
2638 | break; |
2639 | case LTTNG_OBJECT_TYPE_NONE: | |
2640 | break; | |
2641 | default: | |
f2b3ef9f | 2642 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2643 | ret = -1; |
505b2d90 | 2644 | goto error_put_client_list; |
ab0ee2ca JG |
2645 | } |
2646 | ||
2ae99f0b | 2647 | /* |
f2b3ef9f JG |
2648 | * The new trigger's condition must be evaluated against the current |
2649 | * state. | |
2650 | * | |
2651 | * In the case of `notify` action, nothing preventing clients from | |
2652 | * subscribing to a condition before the corresponding trigger is | |
2653 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2654 | * |
2655 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2656 | * reception of a channel sample) to evaluate this new condition, but | |
2657 | * that was broken. | |
2658 | * | |
2659 | * The reason it was broken is that waiting for the next sample | |
2660 | * does not allow us to properly handle transitions for edge-triggered | |
2661 | * conditions. | |
2662 | * | |
2663 | * Consider this example: when we handle a new channel sample, we | |
2664 | * evaluate each conditions twice: once with the previous state, and | |
2665 | * again with the newest state. We then use those two results to | |
2666 | * determine whether a state change happened: a condition was false and | |
2667 | * became true. If a state change happened, we have to notify clients. | |
2668 | * | |
2669 | * Now, if a client subscribes to a given notification and registers | |
2670 | * a trigger *after* that subscription, we have to make sure the | |
2671 | * condition is evaluated at this point while considering only the | |
2672 | * current state. Otherwise, the next evaluation cycle may only see | |
2673 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2674 | * the client will never know that the condition has been met. | |
2675 | */ | |
f2b3ef9f JG |
2676 | switch (get_condition_binding_object(condition)) { |
2677 | case LTTNG_OBJECT_TYPE_SESSION: | |
2678 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2679 | &evaluation, &object_uid, |
2680 | &object_gid); | |
bc8daafb JG |
2681 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2682 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2683 | break; |
f2b3ef9f JG |
2684 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2685 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2686 | &evaluation, &object_uid, |
2687 | &object_gid); | |
bc8daafb JG |
2688 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2689 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2690 | break; |
2691 | case LTTNG_OBJECT_TYPE_NONE: | |
2692 | ret = 0; | |
242388e4 | 2693 | break; |
f2b3ef9f JG |
2694 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2695 | default: | |
2696 | ret = -1; | |
242388e4 | 2697 | break; |
f2b3ef9f JG |
2698 | } |
2699 | ||
2700 | if (ret) { | |
2701 | /* Fatal error. */ | |
2702 | goto error_put_client_list; | |
2703 | } | |
2704 | ||
2705 | DBG("Newly registered trigger's condition evaluated to %s", | |
2706 | evaluation ? "true" : "false"); | |
2707 | if (!evaluation) { | |
2708 | /* Evaluation yielded nothing. Normal exit. */ | |
2709 | ret = 0; | |
242388e4 | 2710 | goto end; |
2ae99f0b JG |
2711 | } |
2712 | ||
2713 | /* | |
f2b3ef9f JG |
2714 | * Ownership of `evaluation` transferred to the action executor |
2715 | * no matter the result. | |
2ae99f0b | 2716 | */ |
f2b3ef9f JG |
2717 | executor_status = action_executor_enqueue(state->executor, trigger, |
2718 | evaluation, &object_creds, client_list); | |
2719 | evaluation = NULL; | |
2720 | switch (executor_status) { | |
2721 | case ACTION_EXECUTOR_STATUS_OK: | |
2722 | break; | |
2723 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2724 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2725 | /* | |
2726 | * TODO Add trigger identification (name/id) when | |
2727 | * it is added to the API. | |
2728 | */ | |
2729 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2730 | ret = -1; | |
2731 | goto error_put_client_list; | |
2732 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
2733 | /* | |
2734 | * TODO Add trigger identification (name/id) when | |
2735 | * it is added to the API. | |
2736 | * | |
2737 | * Not a fatal error. | |
2738 | */ | |
2739 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2740 | ret = 0; | |
242388e4 | 2741 | goto end; |
f2b3ef9f JG |
2742 | default: |
2743 | abort(); | |
2744 | } | |
2ae99f0b | 2745 | |
242388e4 | 2746 | end: |
ab0ee2ca | 2747 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2748 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2749 | trigger_name, trigger_tracer_token); | |
505b2d90 JG |
2750 | |
2751 | error_put_client_list: | |
2752 | notification_client_list_put(client_list); | |
2753 | ||
ab0ee2ca | 2754 | error_free_ht_element: |
242388e4 JR |
2755 | if (trigger_ht_element) { |
2756 | /* Delayed removal due to RCU constraint on delete. */ | |
2757 | call_rcu(&trigger_ht_element->rcu_node, | |
2758 | free_lttng_trigger_ht_element_rcu); | |
2759 | } | |
2760 | ||
e7c93cf9 | 2761 | free(trigger_tokens_ht_element); |
ab0ee2ca JG |
2762 | error: |
2763 | if (free_trigger) { | |
ab0ee2ca JG |
2764 | lttng_trigger_destroy(trigger); |
2765 | } | |
2766 | rcu_read_unlock(); | |
2767 | return ret; | |
2768 | } | |
2769 | ||
83b934ad MD |
2770 | static |
2771 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2772 | { | |
2773 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2774 | rcu_node)); | |
2775 | } | |
2776 | ||
e7c93cf9 JR |
2777 | static |
2778 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
2779 | { | |
2780 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
2781 | rcu_node)); | |
2782 | } | |
2783 | ||
cc2295b5 | 2784 | static |
ab0ee2ca JG |
2785 | int handle_notification_thread_command_unregister_trigger( |
2786 | struct notification_thread_state *state, | |
ac16173e | 2787 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
2788 | enum lttng_error_code *_cmd_reply) |
2789 | { | |
2790 | struct cds_lfht_iter iter; | |
ed327204 | 2791 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
2792 | struct lttng_channel_trigger_list *trigger_list; |
2793 | struct notification_client_list *client_list; | |
ab0ee2ca | 2794 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 2795 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 2796 | trigger); |
ab0ee2ca JG |
2797 | enum lttng_error_code cmd_reply; |
2798 | ||
2799 | rcu_read_lock(); | |
2800 | ||
2801 | cds_lfht_lookup(state->triggers_ht, | |
2802 | lttng_condition_hash(condition), | |
242388e4 JR |
2803 | match_trigger, |
2804 | trigger, | |
ab0ee2ca JG |
2805 | &iter); |
2806 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
2807 | if (!triggers_ht_node) { | |
2808 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2809 | goto end; | |
2810 | } else { | |
2811 | cmd_reply = LTTNG_OK; | |
2812 | } | |
2813 | ||
2814 | /* Remove trigger from channel_triggers_ht. */ | |
2815 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
2816 | channel_triggers_ht_node) { | |
2817 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
2818 | ||
2819 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
2820 | &trigger_list->list, node) { | |
e8f7fa11 | 2821 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
2822 | continue; |
2823 | } | |
2824 | ||
2825 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
2826 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
2827 | /* A trigger can only appear once per channel */ |
2828 | break; | |
ab0ee2ca JG |
2829 | } |
2830 | } | |
2831 | ||
e7c93cf9 | 2832 | if (lttng_condition_get_type(condition) == |
d602bd6a | 2833 | LTTNG_CONDITION_TYPE_ON_EVENT) { |
e7c93cf9 JR |
2834 | struct notification_trigger_tokens_ht_element |
2835 | *trigger_tokens_ht_element; | |
2836 | ||
2837 | cds_lfht_for_each_entry (state->trigger_tokens_ht, &iter, | |
2838 | trigger_tokens_ht_element, node) { | |
2839 | if (!lttng_trigger_is_equal(trigger, | |
2840 | trigger_tokens_ht_element->trigger)) { | |
2841 | continue; | |
2842 | } | |
2843 | ||
2844 | DBG("[notification-thread] Removed trigger from tokens_ht"); | |
2845 | cds_lfht_del(state->trigger_tokens_ht, | |
2846 | &trigger_tokens_ht_element->node); | |
2847 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
2848 | free_notification_trigger_tokens_ht_element_rcu); | |
2849 | ||
2850 | break; | |
2851 | } | |
2852 | } | |
2853 | ||
51367634 JR |
2854 | if (is_trigger_action_notify(trigger)) { |
2855 | /* | |
2856 | * Remove and release the client list from | |
2857 | * notification_trigger_clients_ht. | |
2858 | */ | |
2859 | client_list = get_client_list_from_condition(state, condition); | |
2860 | assert(client_list); | |
ed327204 | 2861 | |
51367634 JR |
2862 | /* Put new reference and the hashtable's reference. */ |
2863 | notification_client_list_put(client_list); | |
2864 | notification_client_list_put(client_list); | |
2865 | client_list = NULL; | |
2866 | } | |
ab0ee2ca JG |
2867 | |
2868 | /* Remove trigger from triggers_ht. */ | |
2869 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
2870 | struct lttng_trigger_ht_element, node); | |
242388e4 | 2871 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2872 | cds_lfht_del(state->triggers_ht, triggers_ht_node); |
2873 | ||
7ca172c1 | 2874 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 2875 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 2876 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
2877 | end: |
2878 | rcu_read_unlock(); | |
2879 | if (_cmd_reply) { | |
2880 | *_cmd_reply = cmd_reply; | |
2881 | } | |
2882 | return 0; | |
2883 | } | |
2884 | ||
2885 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
2886 | int handle_notification_thread_command( | |
2887 | struct notification_thread_handle *handle, | |
2888 | struct notification_thread_state *state) | |
2889 | { | |
2890 | int ret; | |
2891 | uint64_t counter; | |
2892 | struct notification_thread_command *cmd; | |
2893 | ||
8abe313a | 2894 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 2895 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 2896 | sizeof(counter)); |
18aeca05 | 2897 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
2898 | goto error; |
2899 | } | |
2900 | ||
2901 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
2902 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
2903 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
2904 | cds_list_del(&cmd->cmd_list_node); |
2905 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
6900ae81 FD |
2906 | |
2907 | DBG("[notification-thread] Received `%s` command", | |
2908 | notification_command_type_str(cmd->type)); | |
ab0ee2ca JG |
2909 | switch (cmd->type) { |
2910 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
2911 | ret = handle_notification_thread_command_register_trigger(state, |
2912 | cmd->parameters.register_trigger.trigger, | |
ab0ee2ca JG |
2913 | &cmd->reply_code); |
2914 | break; | |
2915 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 2916 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
2917 | state, |
2918 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
2919 | &cmd->reply_code); |
2920 | break; | |
2921 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 2922 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
2923 | state, |
2924 | cmd->parameters.add_channel.session.name, | |
2925 | cmd->parameters.add_channel.session.uid, | |
2926 | cmd->parameters.add_channel.session.gid, | |
2927 | cmd->parameters.add_channel.channel.name, | |
2928 | cmd->parameters.add_channel.channel.domain, | |
2929 | cmd->parameters.add_channel.channel.key, | |
2930 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
2931 | &cmd->reply_code); |
2932 | break; | |
2933 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
2934 | ret = handle_notification_thread_command_remove_channel( |
2935 | state, cmd->parameters.remove_channel.key, | |
2936 | cmd->parameters.remove_channel.domain, | |
2937 | &cmd->reply_code); | |
2938 | break; | |
0ca52944 | 2939 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 2940 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 2941 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 2942 | state, |
ed327204 JG |
2943 | cmd->type, |
2944 | cmd->parameters.session_rotation.session_name, | |
2945 | cmd->parameters.session_rotation.uid, | |
2946 | cmd->parameters.session_rotation.gid, | |
2947 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
2948 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
2949 | &cmd->reply_code); |
2950 | break; | |
d02d7404 JR |
2951 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
2952 | ret = handle_notification_thread_command_add_tracer_event_source( | |
2953 | state, | |
2954 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
2955 | cmd->parameters.tracer_event_source.domain, | |
2956 | &cmd->reply_code); | |
2957 | break; | |
2958 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
2959 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2960 | state, | |
2961 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
2962 | &cmd->reply_code); | |
2963 | break; | |
fbc9f37d JR |
2964 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
2965 | { | |
2966 | struct lttng_triggers *triggers = NULL; | |
2967 | ||
2968 | ret = handle_notification_thread_command_list_triggers( | |
2969 | handle, | |
2970 | state, | |
2971 | cmd->parameters.list_triggers.uid, | |
2972 | &triggers, | |
2973 | &cmd->reply_code); | |
2974 | cmd->reply.list_triggers.triggers = triggers; | |
2975 | ret = 0; | |
2976 | break; | |
2977 | } | |
ab0ee2ca | 2978 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
2979 | cmd->reply_code = LTTNG_OK; |
2980 | ret = 1; | |
2981 | goto end; | |
f2b3ef9f JG |
2982 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
2983 | { | |
2984 | const enum client_transmission_status client_status = | |
2985 | cmd->parameters.client_communication_update | |
2986 | .status; | |
2987 | const notification_client_id client_id = | |
2988 | cmd->parameters.client_communication_update.id; | |
2989 | struct notification_client *client; | |
2990 | ||
2991 | rcu_read_lock(); | |
2992 | client = get_client_from_id(client_id, state); | |
2993 | ||
2994 | if (!client) { | |
2995 | /* | |
2996 | * Client error was probably already picked-up by the | |
2997 | * notification thread or it has disconnected | |
2998 | * gracefully while this command was queued. | |
2999 | */ | |
3000 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
3001 | client_id); | |
3002 | ret = 0; | |
3003 | } else { | |
f2b3ef9f JG |
3004 | ret = client_handle_transmission_status( |
3005 | client, client_status, state); | |
f2b3ef9f JG |
3006 | } |
3007 | rcu_read_unlock(); | |
3008 | break; | |
3009 | } | |
ab0ee2ca JG |
3010 | default: |
3011 | ERR("[notification-thread] Unknown internal command received"); | |
3012 | goto error_unlock; | |
3013 | } | |
3014 | ||
3015 | if (ret) { | |
3016 | goto error_unlock; | |
3017 | } | |
3018 | end: | |
0ab399e0 JG |
3019 | if (cmd->is_async) { |
3020 | free(cmd); | |
3021 | cmd = NULL; | |
3022 | } else { | |
3023 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3024 | } | |
ab0ee2ca JG |
3025 | return ret; |
3026 | error_unlock: | |
3027 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3028 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3029 | cmd->reply_code = LTTNG_ERR_FATAL; |
3030 | error: | |
3031 | /* Indicate a fatal error to the caller. */ | |
3032 | return -1; | |
3033 | } | |
3034 | ||
ab0ee2ca JG |
3035 | static |
3036 | int socket_set_non_blocking(int socket) | |
3037 | { | |
3038 | int ret, flags; | |
3039 | ||
3040 | /* Set the pipe as non-blocking. */ | |
3041 | ret = fcntl(socket, F_GETFL, 0); | |
3042 | if (ret == -1) { | |
3043 | PERROR("fcntl get socket flags"); | |
3044 | goto end; | |
3045 | } | |
3046 | flags = ret; | |
3047 | ||
3048 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3049 | if (ret == -1) { | |
3050 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3051 | goto end; | |
3052 | } | |
3053 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3054 | end: | |
3055 | return ret; | |
3056 | } | |
3057 | ||
3058 | static | |
14fa22f8 | 3059 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3060 | { |
3061 | int ret; | |
3062 | ||
882093ee JR |
3063 | |
3064 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3065 | |
3066 | client->communication.inbound.bytes_to_receive = | |
3067 | sizeof(struct lttng_notification_channel_message); | |
3068 | client->communication.inbound.msg_type = | |
3069 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3070 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3071 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3072 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3073 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3074 | client->communication.inbound.bytes_to_receive); |
882093ee | 3075 | |
14fa22f8 | 3076 | return ret; |
ab0ee2ca JG |
3077 | } |
3078 | ||
3079 | int handle_notification_thread_client_connect( | |
3080 | struct notification_thread_state *state) | |
3081 | { | |
3082 | int ret; | |
3083 | struct notification_client *client; | |
3084 | ||
3085 | DBG("[notification-thread] Handling new notification channel client connection"); | |
3086 | ||
3087 | client = zmalloc(sizeof(*client)); | |
3088 | if (!client) { | |
3089 | /* Fatal error. */ | |
3090 | ret = -1; | |
3091 | goto error; | |
3092 | } | |
6c24d3fd | 3093 | |
505b2d90 | 3094 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3095 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3096 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3097 | lttng_payload_init(&client->communication.inbound.payload); |
3098 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3099 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3100 | |
14fa22f8 JG |
3101 | ret = client_reset_inbound_state(client); |
3102 | if (ret) { | |
3103 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
e742b055 | 3104 | ret = 0; |
14fa22f8 JG |
3105 | goto error; |
3106 | } | |
ab0ee2ca JG |
3107 | |
3108 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3109 | if (ret < 0) { | |
3110 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
3111 | ret = 0; | |
3112 | goto error; | |
3113 | } | |
3114 | ||
3115 | client->socket = ret; | |
3116 | ||
3117 | ret = socket_set_non_blocking(client->socket); | |
3118 | if (ret) { | |
3119 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
3120 | goto error; | |
3121 | } | |
3122 | ||
3123 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3124 | if (ret < 0) { | |
3125 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
3126 | ret = 0; | |
3127 | goto error; | |
3128 | } | |
3129 | ||
3130 | ret = lttng_poll_add(&state->events, client->socket, | |
3131 | LPOLLIN | LPOLLERR | | |
3132 | LPOLLHUP | LPOLLRDHUP); | |
3133 | if (ret < 0) { | |
3134 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
3135 | ret = 0; | |
3136 | goto error; | |
3137 | } | |
3138 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
3139 | client->socket); | |
3140 | ||
ab0ee2ca JG |
3141 | rcu_read_lock(); |
3142 | cds_lfht_add(state->client_socket_ht, | |
3143 | hash_client_socket(client->socket), | |
3144 | &client->client_socket_ht_node); | |
ac1889bf JG |
3145 | cds_lfht_add(state->client_id_ht, |
3146 | hash_client_id(client->id), | |
3147 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3148 | rcu_read_unlock(); |
3149 | ||
3150 | return ret; | |
6c24d3fd | 3151 | |
ab0ee2ca JG |
3152 | error: |
3153 | notification_client_destroy(client, state); | |
3154 | return ret; | |
3155 | } | |
3156 | ||
6c24d3fd JG |
3157 | /* |
3158 | * RCU read-lock must be held by the caller. | |
3159 | * Client lock must _not_ be held by the caller. | |
3160 | */ | |
505b2d90 JG |
3161 | static |
3162 | int notification_thread_client_disconnect( | |
3163 | struct notification_client *client, | |
ab0ee2ca | 3164 | struct notification_thread_state *state) |
505b2d90 JG |
3165 | { |
3166 | int ret; | |
3167 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3168 | ||
3169 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 3170 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3171 | client->communication.active = false; |
6c24d3fd JG |
3172 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3173 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3174 | pthread_mutex_unlock(&client->lock); | |
3175 | ||
505b2d90 JG |
3176 | ret = lttng_poll_del(&state->events, client->socket); |
3177 | if (ret) { | |
3178 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
3179 | client->socket); | |
3180 | } | |
3181 | ||
505b2d90 JG |
3182 | /* Release all conditions to which the client was subscribed. */ |
3183 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3184 | &client->condition_list, node) { | |
3185 | (void) notification_thread_client_unsubscribe(client, | |
3186 | condition_list_element->condition, state, NULL); | |
3187 | } | |
3188 | ||
3189 | /* | |
3190 | * Client no longer accessible to other threads (through the | |
3191 | * client lists). | |
3192 | */ | |
3193 | notification_client_destroy(client, state); | |
3194 | return ret; | |
3195 | } | |
3196 | ||
3197 | int handle_notification_thread_client_disconnect( | |
3198 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3199 | { |
3200 | int ret = 0; | |
3201 | struct notification_client *client; | |
3202 | ||
3203 | rcu_read_lock(); | |
3204 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
3205 | client_socket); | |
3206 | client = get_client_from_socket(client_socket, state); | |
3207 | if (!client) { | |
3208 | /* Internal state corruption, fatal error. */ | |
3209 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
3210 | client_socket); | |
3211 | ret = -1; | |
3212 | goto end; | |
3213 | } | |
3214 | ||
505b2d90 | 3215 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3216 | end: |
3217 | rcu_read_unlock(); | |
3218 | return ret; | |
3219 | } | |
3220 | ||
3221 | int handle_notification_thread_client_disconnect_all( | |
3222 | struct notification_thread_state *state) | |
3223 | { | |
3224 | struct cds_lfht_iter iter; | |
3225 | struct notification_client *client; | |
3226 | bool error_encoutered = false; | |
3227 | ||
3228 | rcu_read_lock(); | |
3229 | DBG("[notification-thread] Closing all client connections"); | |
3230 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
505b2d90 | 3231 | client_socket_ht_node) { |
ab0ee2ca JG |
3232 | int ret; |
3233 | ||
505b2d90 JG |
3234 | ret = notification_thread_client_disconnect( |
3235 | client, state); | |
ab0ee2ca JG |
3236 | if (ret) { |
3237 | error_encoutered = true; | |
3238 | } | |
3239 | } | |
3240 | rcu_read_unlock(); | |
3241 | return error_encoutered ? 1 : 0; | |
3242 | } | |
3243 | ||
3244 | int handle_notification_thread_trigger_unregister_all( | |
3245 | struct notification_thread_state *state) | |
3246 | { | |
4149ace8 | 3247 | bool error_occurred = false; |
ab0ee2ca JG |
3248 | struct cds_lfht_iter iter; |
3249 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3250 | ||
763de384 | 3251 | rcu_read_lock(); |
ab0ee2ca JG |
3252 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3253 | node) { | |
3254 | int ret = handle_notification_thread_command_unregister_trigger( | |
3255 | state, trigger_ht_element->trigger, NULL); | |
3256 | if (ret) { | |
4149ace8 | 3257 | error_occurred = true; |
ab0ee2ca JG |
3258 | } |
3259 | } | |
763de384 | 3260 | rcu_read_unlock(); |
4149ace8 | 3261 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3262 | } |
3263 | ||
dd877ea6 JG |
3264 | static |
3265 | int client_handle_transmission_status( | |
3266 | struct notification_client *client, | |
3267 | enum client_transmission_status transmission_status, | |
3268 | struct notification_thread_state *state) | |
3269 | { | |
3270 | int ret = 0; | |
3271 | ||
3272 | switch (transmission_status) { | |
3273 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3274 | ret = lttng_poll_mod(&state->events, client->socket, | |
3275 | CLIENT_POLL_MASK_IN); | |
3276 | if (ret) { | |
3277 | goto end; | |
3278 | } | |
3279 | ||
dd877ea6 JG |
3280 | break; |
3281 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3282 | /* | |
3283 | * We want to be notified whenever there is buffer space | |
3284 | * available to send the rest of the payload. | |
3285 | */ | |
3286 | ret = lttng_poll_mod(&state->events, client->socket, | |
3287 | CLIENT_POLL_MASK_IN_OUT); | |
3288 | if (ret) { | |
3289 | goto end; | |
3290 | } | |
3291 | break; | |
3292 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3293 | ret = notification_thread_client_disconnect(client, state); | |
3294 | if (ret) { | |
3295 | goto end; | |
3296 | } | |
3297 | break; | |
3298 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3299 | ret = -1; | |
3300 | goto end; | |
3301 | default: | |
3302 | abort(); | |
3303 | } | |
3304 | end: | |
3305 | return ret; | |
3306 | } | |
3307 | ||
505b2d90 | 3308 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3309 | static |
dd877ea6 | 3310 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3311 | struct notification_client *client) |
ab0ee2ca JG |
3312 | { |
3313 | ssize_t ret; | |
3314 | size_t to_send_count; | |
dd877ea6 | 3315 | enum client_transmission_status status; |
882093ee JR |
3316 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3317 | &client->communication.outbound.payload, 0, -1); | |
3318 | const int fds_to_send_count = | |
3319 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3320 | |
505b2d90 JG |
3321 | ASSERT_LOCKED(client->lock); |
3322 | ||
f2b3ef9f JG |
3323 | if (!client->communication.active) { |
3324 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3325 | goto end; | |
3326 | } | |
3327 | ||
882093ee JR |
3328 | if (pv.buffer.size == 0) { |
3329 | /* | |
3330 | * If both data and fds are equal to zero, we are in an invalid | |
3331 | * state. | |
3332 | */ | |
3333 | assert(fds_to_send_count != 0); | |
3334 | goto send_fds; | |
3335 | } | |
3336 | ||
3337 | /* Send data. */ | |
3338 | to_send_count = pv.buffer.size; | |
ab0ee2ca JG |
3339 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", |
3340 | client->socket); | |
3341 | ||
3342 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3343 | pv.buffer.data, |
ab0ee2ca | 3344 | to_send_count); |
44c180ca | 3345 | if ((ret >= 0 && ret < to_send_count)) { |
ab0ee2ca JG |
3346 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", |
3347 | client->socket); | |
3348 | to_send_count -= max(ret, 0); | |
3349 | ||
6f110534 | 3350 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3351 | pv.buffer.data + |
3352 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3353 | to_send_count); |
3354 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3355 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3356 | to_send_count); |
3357 | if (ret) { | |
3358 | goto error; | |
3359 | } | |
6c24d3fd | 3360 | |
dd877ea6 | 3361 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3362 | goto end; |
ab0ee2ca | 3363 | } else if (ret < 0) { |
6c24d3fd | 3364 | /* Generic error, disable the client's communication. */ |
dd877ea6 | 3365 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3366 | client->socket); |
6c24d3fd | 3367 | client->communication.active = false; |
dd877ea6 | 3368 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3369 | goto end; |
ab0ee2ca | 3370 | } else { |
882093ee JR |
3371 | /* |
3372 | * No error and flushed the queue completely. | |
3373 | * | |
3374 | * The payload buffer size is used later to | |
3375 | * check if there is notifications queued. So albeit that the | |
3376 | * direct caller knows that the transmission is complete, we | |
3377 | * need to set the buffer size to zero. | |
3378 | */ | |
ab0ee2ca | 3379 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3380 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3381 | if (ret) { |
3382 | goto error; | |
3383 | } | |
882093ee | 3384 | } |
6c24d3fd | 3385 | |
882093ee JR |
3386 | send_fds: |
3387 | /* No fds to send, transmission is complete. */ | |
3388 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3389 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3390 | goto end; |
dd877ea6 | 3391 | } |
882093ee JR |
3392 | |
3393 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3394 | client->socket, &pv); | |
3395 | if (ret < 0) { | |
3396 | /* Generic error, disable the client's communication. */ | |
3397 | ERR("[notification-thread] Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", | |
3398 | client->socket); | |
3399 | client->communication.active = false; | |
3400 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3401 | goto end; | |
3402 | } else if (ret == 0) { | |
3403 | /* Nothing could be sent. */ | |
3404 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3405 | } else { | |
3406 | /* Fd passing is an all or nothing kind of thing. */ | |
3407 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3408 | /* | |
3409 | * The payload _fd_array count is used later to | |
3410 | * check if there is notifications queued. So although the | |
3411 | * direct caller knows that the transmission is complete, we | |
3412 | * need to clear the _fd_array for the queuing check. | |
3413 | */ | |
3414 | lttng_dynamic_pointer_array_clear( | |
3415 | &client->communication.outbound.payload | |
3416 | ._fd_handles); | |
3417 | } | |
3418 | ||
f2b3ef9f | 3419 | end: |
882093ee JR |
3420 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3421 | client->communication.outbound.queued_command_reply = false; | |
3422 | client->communication.outbound.dropped_notification = false; | |
3423 | lttng_payload_clear(&client->communication.outbound.payload); | |
3424 | } | |
3425 | ||
f2b3ef9f | 3426 | return status; |
ab0ee2ca | 3427 | error: |
f2b3ef9f | 3428 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3429 | } |
3430 | ||
882093ee JR |
3431 | static |
3432 | bool client_has_outbound_data_left( | |
3433 | const struct notification_client *client) | |
3434 | { | |
3435 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3436 | &client->communication.outbound.payload, 0, -1); | |
3437 | const bool has_data = pv.buffer.size != 0; | |
3438 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3439 | ||
3440 | return has_data || has_fds; | |
3441 | } | |
3442 | ||
6c24d3fd | 3443 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3444 | static |
3445 | int client_send_command_reply(struct notification_client *client, | |
3446 | struct notification_thread_state *state, | |
3447 | enum lttng_notification_channel_status status) | |
3448 | { | |
3449 | int ret; | |
3450 | struct lttng_notification_channel_command_reply reply = { | |
3451 | .status = (int8_t) status, | |
3452 | }; | |
3453 | struct lttng_notification_channel_message msg = { | |
3454 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3455 | .size = sizeof(reply), | |
3456 | }; | |
3457 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3458 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3459 | |
6c24d3fd JG |
3460 | memcpy(buffer, &msg, sizeof(msg)); |
3461 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
3462 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
505b2d90 | 3463 | |
6c24d3fd | 3464 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3465 | if (client->communication.outbound.queued_command_reply) { |
3466 | /* Protocol error. */ | |
6c24d3fd | 3467 | goto error_unlock; |
ab0ee2ca JG |
3468 | } |
3469 | ||
ab0ee2ca JG |
3470 | /* Enqueue buffer to outgoing queue and flush it. */ |
3471 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3472 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3473 | buffer, sizeof(buffer)); |
3474 | if (ret) { | |
6c24d3fd | 3475 | goto error_unlock; |
ab0ee2ca JG |
3476 | } |
3477 | ||
f2b3ef9f | 3478 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3479 | |
3480 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3481 | /* Queue could not be emptied. */ |
3482 | client->communication.outbound.queued_command_reply = true; | |
3483 | } | |
3484 | ||
3485 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3486 | ret = client_handle_transmission_status( |
3487 | client, transmission_status, state); | |
ab0ee2ca JG |
3488 | if (ret) { |
3489 | goto error; | |
3490 | } | |
3491 | ||
ab0ee2ca | 3492 | return 0; |
6c24d3fd JG |
3493 | error_unlock: |
3494 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3495 | error: |
3496 | return -1; | |
3497 | } | |
3498 | ||
505b2d90 JG |
3499 | static |
3500 | int client_handle_message_unknown(struct notification_client *client, | |
3501 | struct notification_thread_state *state) | |
3502 | { | |
3503 | int ret; | |
505b2d90 JG |
3504 | /* |
3505 | * Receiving message header. The function will be called again | |
3506 | * once the rest of the message as been received and can be | |
3507 | * interpreted. | |
3508 | */ | |
3509 | const struct lttng_notification_channel_message *msg; | |
3510 | ||
882093ee | 3511 | assert(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3512 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3513 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3514 | |
3515 | if (msg->size == 0 || | |
3516 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
3517 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
3518 | msg->size); | |
3519 | ret = -1; | |
3520 | goto end; | |
3521 | } | |
3522 | ||
3523 | switch (msg->type) { | |
3524 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3525 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3526 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3527 | break; | |
3528 | default: | |
3529 | ret = -1; | |
3530 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
3531 | goto end; | |
3532 | } | |
3533 | ||
3534 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3535 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3536 | client->communication.inbound.msg_type = |
3537 | (enum lttng_notification_channel_message_type) msg->type; | |
3538 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3539 | &client->communication.inbound.payload.buffer, msg->size); |
3540 | ||
3541 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3542 | msg = NULL; | |
505b2d90 | 3543 | end: |
505b2d90 JG |
3544 | return ret; |
3545 | } | |
3546 | ||
3547 | static | |
3548 | int client_handle_message_handshake(struct notification_client *client, | |
3549 | struct notification_thread_state *state) | |
3550 | { | |
3551 | int ret; | |
3552 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3553 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3554 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3555 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3556 | }; | |
3557 | const struct lttng_notification_channel_message msg_header = { | |
3558 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3559 | .size = sizeof(handshake_reply), | |
3560 | }; | |
3561 | enum lttng_notification_channel_status status = | |
3562 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3563 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3564 | |
3565 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3566 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3567 | sizeof(handshake_reply)); | |
3568 | ||
3569 | handshake_client = | |
3570 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3571 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3572 | .data; |
3573 | client->major = handshake_client->major; | |
3574 | client->minor = handshake_client->minor; | |
3575 | if (!client->communication.inbound.creds_received) { | |
3576 | ERR("[notification-thread] No credentials received from client"); | |
3577 | ret = -1; | |
3578 | goto end; | |
3579 | } | |
3580 | ||
3581 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3582 | &client->communication.inbound.creds); | |
3583 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3584 | &client->communication.inbound.creds); | |
3585 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
3586 | client->uid, client->gid, (int) client->major, | |
3587 | (int) client->minor); | |
3588 | ||
3589 | if (handshake_client->major != | |
3590 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3591 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3592 | } | |
3593 | ||
6c24d3fd JG |
3594 | pthread_mutex_lock(&client->lock); |
3595 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3596 | ret = lttng_dynamic_buffer_append( |
882093ee | 3597 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3598 | sizeof(send_buffer)); |
3599 | if (ret) { | |
3600 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
6c24d3fd | 3601 | goto end_unlock; |
505b2d90 JG |
3602 | } |
3603 | ||
3604 | client->validated = true; | |
3605 | client->communication.active = true; | |
6c24d3fd | 3606 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3607 | |
6c24d3fd JG |
3608 | /* Set reception state to receive the next message header. */ |
3609 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3610 | if (ret) { |
6c24d3fd | 3611 | ERR("[notification-thread] Failed to reset client communication's inbound state"); |
505b2d90 JG |
3612 | goto end; |
3613 | } | |
3614 | ||
6c24d3fd | 3615 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3616 | ret = client_send_command_reply(client, state, status); |
3617 | if (ret) { | |
3618 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3619 | goto end; | |
3620 | } | |
3621 | ||
6c24d3fd JG |
3622 | goto end; |
3623 | end_unlock: | |
505b2d90 | 3624 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3625 | end: |
505b2d90 JG |
3626 | return ret; |
3627 | } | |
3628 | ||
3629 | static | |
3630 | int client_handle_message_subscription( | |
3631 | struct notification_client *client, | |
3632 | enum lttng_notification_channel_message_type msg_type, | |
3633 | struct notification_thread_state *state) | |
3634 | { | |
3635 | int ret; | |
3636 | struct lttng_condition *condition; | |
3637 | enum lttng_notification_channel_status status = | |
3638 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3639 | struct lttng_payload_view condition_view = | |
882093ee JR |
3640 | lttng_payload_view_from_payload( |
3641 | &client->communication.inbound.payload, | |
505b2d90 JG |
3642 | 0, -1); |
3643 | size_t expected_condition_size; | |
3644 | ||
6c24d3fd JG |
3645 | /* |
3646 | * No need to lock client to sample the inbound state as the only | |
3647 | * other thread accessing clients (action executor) only uses the | |
3648 | * outbound state. | |
3649 | */ | |
882093ee | 3650 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3651 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3652 | if (ret != expected_condition_size) { | |
3653 | ERR("[notification-thread] Malformed condition received from client"); | |
3654 | goto end; | |
3655 | } | |
3656 | ||
3657 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
3658 | ret = notification_thread_client_subscribe( | |
3659 | client, condition, state, &status); | |
3660 | } else { | |
3661 | ret = notification_thread_client_unsubscribe( | |
3662 | client, condition, state, &status); | |
3663 | } | |
505b2d90 | 3664 | |
505b2d90 | 3665 | if (ret) { |
6c24d3fd | 3666 | goto end; |
505b2d90 JG |
3667 | } |
3668 | ||
3669 | /* Set reception state to receive the next message header. */ | |
3670 | ret = client_reset_inbound_state(client); | |
3671 | if (ret) { | |
3672 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
6c24d3fd JG |
3673 | goto end; |
3674 | } | |
3675 | ||
3676 | ret = client_send_command_reply(client, state, status); | |
3677 | if (ret) { | |
3678 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3679 | goto end; | |
505b2d90 JG |
3680 | } |
3681 | ||
505b2d90 JG |
3682 | end: |
3683 | return ret; | |
3684 | } | |
3685 | ||
ab0ee2ca JG |
3686 | static |
3687 | int client_dispatch_message(struct notification_client *client, | |
3688 | struct notification_thread_state *state) | |
3689 | { | |
3690 | int ret = 0; | |
3691 | ||
3692 | if (client->communication.inbound.msg_type != | |
3693 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3694 | client->communication.inbound.msg_type != | |
3695 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3696 | !client->validated) { | |
3697 | WARN("[notification-thread] client attempted a command before handshake"); | |
3698 | ret = -1; | |
3699 | goto end; | |
3700 | } | |
3701 | ||
3702 | switch (client->communication.inbound.msg_type) { | |
3703 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3704 | { | |
505b2d90 | 3705 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3706 | break; |
3707 | } | |
3708 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3709 | { | |
505b2d90 | 3710 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3711 | break; |
3712 | } | |
3713 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3714 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3715 | { | |
505b2d90 JG |
3716 | ret = client_handle_message_subscription(client, |
3717 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3718 | break; |
3719 | } | |
3720 | default: | |
3721 | abort(); | |
3722 | } | |
3723 | end: | |
3724 | return ret; | |
3725 | } | |
3726 | ||
3727 | /* Incoming data from client. */ | |
3728 | int handle_notification_thread_client_in( | |
3729 | struct notification_thread_state *state, int socket) | |
3730 | { | |
14fa22f8 | 3731 | int ret = 0; |
ab0ee2ca JG |
3732 | struct notification_client *client; |
3733 | ssize_t recv_ret; | |
3734 | size_t offset; | |
3735 | ||
98b5ff34 | 3736 | rcu_read_lock(); |
ab0ee2ca JG |
3737 | client = get_client_from_socket(socket, state); |
3738 | if (!client) { | |
3739 | /* Internal error, abort. */ | |
3740 | ret = -1; | |
3741 | goto end; | |
3742 | } | |
3743 | ||
882093ee | 3744 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3745 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3746 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3747 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3748 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3749 | client->communication.inbound.bytes_to_receive, |
3750 | &client->communication.inbound.creds); | |
3751 | if (recv_ret > 0) { | |
01ea340e | 3752 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3753 | client->communication.inbound.creds_received = true; |
3754 | } | |
3755 | } else { | |
3756 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 3757 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3758 | client->communication.inbound.bytes_to_receive); |
3759 | } | |
505b2d90 JG |
3760 | if (recv_ret >= 0) { |
3761 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
3762 | } else { |
3763 | goto error_disconnect_client; | |
505b2d90 | 3764 | } |
6c24d3fd | 3765 | |
882093ee JR |
3766 | if (client->communication.inbound.bytes_to_receive != 0) { |
3767 | /* Message incomplete wait for more data. */ | |
3768 | ret = 0; | |
3769 | goto end; | |
ab0ee2ca JG |
3770 | } |
3771 | ||
882093ee JR |
3772 | assert(client->communication.inbound.bytes_to_receive == 0); |
3773 | ||
3774 | /* Receive fds. */ | |
3775 | if (client->communication.inbound.fds_to_receive != 0) { | |
3776 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
3777 | client->socket, | |
3778 | client->communication.inbound.fds_to_receive, | |
3779 | &client->communication.inbound.payload); | |
3780 | if (ret > 0) { | |
ab0ee2ca | 3781 | /* |
882093ee JR |
3782 | * Fds received. non blocking fds passing is all |
3783 | * or nothing. | |
ab0ee2ca | 3784 | */ |
882093ee JR |
3785 | ssize_t expected_size; |
3786 | ||
3787 | expected_size = sizeof(int) * | |
3788 | client->communication.inbound | |
3789 | .fds_to_receive; | |
3790 | assert(ret == expected_size); | |
3791 | client->communication.inbound.fds_to_receive = 0; | |
3792 | } else if (ret == 0) { | |
3793 | /* Received nothing. */ | |
3794 | ret = 0; | |
3795 | goto end; | |
3796 | } else { | |
ab0ee2ca JG |
3797 | goto error_disconnect_client; |
3798 | } | |
ab0ee2ca | 3799 | } |
882093ee JR |
3800 | |
3801 | /* At this point the message is complete.*/ | |
3802 | assert(client->communication.inbound.bytes_to_receive == 0 && | |
3803 | client->communication.inbound.fds_to_receive == 0); | |
3804 | ret = client_dispatch_message(client, state); | |
3805 | if (ret) { | |
3806 | /* | |
3807 | * Only returns an error if this client must be | |
3808 | * disconnected. | |
3809 | */ | |
3810 | goto error_disconnect_client; | |
3811 | } | |
3812 | ||
ab0ee2ca | 3813 | end: |
98b5ff34 | 3814 | rcu_read_unlock(); |
ab0ee2ca | 3815 | return ret; |
882093ee | 3816 | |
ab0ee2ca | 3817 | error_disconnect_client: |
505b2d90 | 3818 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 3819 | goto end; |
ab0ee2ca JG |
3820 | } |
3821 | ||
3822 | /* Client ready to receive outgoing data. */ | |
3823 | int handle_notification_thread_client_out( | |
3824 | struct notification_thread_state *state, int socket) | |
3825 | { | |
3826 | int ret; | |
3827 | struct notification_client *client; | |
f2b3ef9f | 3828 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3829 | |
98b5ff34 | 3830 | rcu_read_lock(); |
ab0ee2ca JG |
3831 | client = get_client_from_socket(socket, state); |
3832 | if (!client) { | |
3833 | /* Internal error, abort. */ | |
3834 | ret = -1; | |
3835 | goto end; | |
3836 | } | |
3837 | ||
505b2d90 | 3838 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 3839 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
3840 | pthread_mutex_unlock(&client->lock); |
3841 | ||
f2b3ef9f JG |
3842 | ret = client_handle_transmission_status( |
3843 | client, transmission_status, state); | |
ab0ee2ca JG |
3844 | if (ret) { |
3845 | goto end; | |
3846 | } | |
3847 | end: | |
98b5ff34 | 3848 | rcu_read_unlock(); |
ab0ee2ca JG |
3849 | return ret; |
3850 | } | |
3851 | ||
3852 | static | |
e8360425 JD |
3853 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
3854 | const struct channel_state_sample *sample, | |
3855 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
3856 | { |
3857 | bool result = false; | |
3858 | uint64_t threshold; | |
3859 | enum lttng_condition_type condition_type; | |
e8360425 | 3860 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
3861 | condition, struct lttng_condition_buffer_usage, |
3862 | parent); | |
3863 | ||
ab0ee2ca JG |
3864 | if (use_condition->threshold_bytes.set) { |
3865 | threshold = use_condition->threshold_bytes.value; | |
3866 | } else { | |
3867 | /* | |
3868 | * Threshold was expressed as a ratio. | |
3869 | * | |
3870 | * TODO the threshold (in bytes) of conditions expressed | |
3871 | * as a ratio of total buffer size could be cached to | |
3872 | * forego this double-multiplication or it could be performed | |
3873 | * as fixed-point math. | |
3874 | * | |
d49487dc | 3875 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
3876 | * condition applies to multiple channels (i.e. don't assume |
3877 | * that all channels matching my_chann* have the same size...) | |
3878 | */ | |
3879 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
3880 | (double) buffer_capacity); | |
3881 | } | |
3882 | ||
3883 | condition_type = lttng_condition_get_type(condition); | |
3884 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
3885 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3886 | threshold, sample->highest_usage); | |
3887 | ||
3888 | /* | |
3889 | * The low condition should only be triggered once _all_ of the | |
3890 | * streams in a channel have gone below the "low" threshold. | |
3891 | */ | |
3892 | if (sample->highest_usage <= threshold) { | |
3893 | result = true; | |
3894 | } | |
3895 | } else { | |
3896 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3897 | threshold, sample->highest_usage); | |
3898 | ||
3899 | /* | |
3900 | * For high buffer usage scenarios, we want to trigger whenever | |
3901 | * _any_ of the streams has reached the "high" threshold. | |
3902 | */ | |
3903 | if (sample->highest_usage >= threshold) { | |
3904 | result = true; | |
3905 | } | |
3906 | } | |
e8360425 | 3907 | |
ab0ee2ca JG |
3908 | return result; |
3909 | } | |
3910 | ||
3911 | static | |
e8360425 JD |
3912 | bool evaluate_session_consumed_size_condition( |
3913 | const struct lttng_condition *condition, | |
3914 | uint64_t session_consumed_size) | |
3915 | { | |
3916 | uint64_t threshold; | |
3917 | const struct lttng_condition_session_consumed_size *size_condition = | |
3918 | container_of(condition, | |
3919 | struct lttng_condition_session_consumed_size, | |
3920 | parent); | |
3921 | ||
3922 | threshold = size_condition->consumed_threshold_bytes.value; | |
3923 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
3924 | threshold, session_consumed_size); | |
3925 | return session_consumed_size >= threshold; | |
3926 | } | |
3927 | ||
3928 | static | |
ed327204 | 3929 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 3930 | struct lttng_evaluation **evaluation, |
e8360425 JD |
3931 | const struct notification_thread_state *state, |
3932 | const struct channel_state_sample *previous_sample, | |
3933 | const struct channel_state_sample *latest_sample, | |
3934 | uint64_t previous_session_consumed_total, | |
3935 | uint64_t latest_session_consumed_total, | |
3936 | struct channel_info *channel_info) | |
ab0ee2ca JG |
3937 | { |
3938 | int ret = 0; | |
3939 | enum lttng_condition_type condition_type; | |
e8360425 JD |
3940 | const bool previous_sample_available = !!previous_sample; |
3941 | bool previous_sample_result = false; | |
ab0ee2ca JG |
3942 | bool latest_sample_result; |
3943 | ||
3944 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 3945 | |
e8360425 JD |
3946 | switch (condition_type) { |
3947 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3948 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
3949 | if (caa_likely(previous_sample_available)) { | |
3950 | previous_sample_result = | |
3951 | evaluate_buffer_usage_condition(condition, | |
3952 | previous_sample, channel_info->capacity); | |
3953 | } | |
3954 | latest_sample_result = evaluate_buffer_usage_condition( | |
3955 | condition, latest_sample, | |
3956 | channel_info->capacity); | |
3957 | break; | |
3958 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3959 | if (caa_likely(previous_sample_available)) { | |
3960 | previous_sample_result = | |
3961 | evaluate_session_consumed_size_condition( | |
3962 | condition, | |
3963 | previous_session_consumed_total); | |
3964 | } | |
3965 | latest_sample_result = | |
3966 | evaluate_session_consumed_size_condition( | |
3967 | condition, | |
3968 | latest_session_consumed_total); | |
3969 | break; | |
3970 | default: | |
3971 | /* Unknown condition type; internal error. */ | |
3972 | abort(); | |
3973 | } | |
ab0ee2ca JG |
3974 | |
3975 | if (!latest_sample_result || | |
3976 | (previous_sample_result == latest_sample_result)) { | |
3977 | /* | |
3978 | * Only trigger on a condition evaluation transition. | |
3979 | * | |
3980 | * NOTE: This edge-triggered logic may not be appropriate for | |
3981 | * future condition types. | |
3982 | */ | |
3983 | goto end; | |
3984 | } | |
3985 | ||
e8360425 JD |
3986 | if (!evaluation || !latest_sample_result) { |
3987 | goto end; | |
3988 | } | |
3989 | ||
3990 | switch (condition_type) { | |
3991 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3992 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
3993 | *evaluation = lttng_evaluation_buffer_usage_create( |
3994 | condition_type, | |
3995 | latest_sample->highest_usage, | |
e8360425 JD |
3996 | channel_info->capacity); |
3997 | break; | |
3998 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3999 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
4000 | latest_session_consumed_total); |
4001 | break; | |
4002 | default: | |
4003 | abort(); | |
4004 | } | |
4005 | ||
4006 | if (!*evaluation) { | |
4007 | ret = -1; | |
4008 | goto end; | |
ab0ee2ca JG |
4009 | } |
4010 | end: | |
4011 | return ret; | |
4012 | } | |
4013 | ||
4014 | static | |
f2b3ef9f | 4015 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4016 | { |
f2b3ef9f JG |
4017 | int ret = 0; |
4018 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 4019 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
4020 | }; |
4021 | ||
505b2d90 JG |
4022 | ASSERT_LOCKED(client->lock); |
4023 | ||
f2b3ef9f JG |
4024 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4025 | client->socket); | |
4026 | if (client->communication.outbound.dropped_notification) { | |
4027 | /* | |
4028 | * The client already has a "notification dropped" message | |
4029 | * in its outgoing queue. Nothing to do since all | |
4030 | * of those messages are coalesced. | |
4031 | */ | |
4032 | goto end; | |
4033 | } | |
4034 | ||
4035 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4036 | ret = lttng_dynamic_buffer_append( |
882093ee | 4037 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4038 | sizeof(msg)); |
f2b3ef9f JG |
4039 | if (ret) { |
4040 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4041 | client->socket); | |
4042 | } | |
4043 | end: | |
ab0ee2ca JG |
4044 | return ret; |
4045 | } | |
4046 | ||
f2b3ef9f JG |
4047 | static int client_handle_transmission_status_wrapper( |
4048 | struct notification_client *client, | |
4049 | enum client_transmission_status status, | |
4050 | void *user_data) | |
4051 | { | |
4052 | return client_handle_transmission_status(client, status, | |
4053 | (struct notification_thread_state *) user_data); | |
4054 | } | |
4055 | ||
4056 | static | |
4057 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4058 | const struct lttng_evaluation *evaluation, | |
4059 | struct notification_client_list* client_list, | |
4060 | struct notification_thread_state *state, | |
4061 | uid_t object_uid, gid_t object_gid) | |
4062 | { | |
ff588497 JR |
4063 | const struct lttng_credentials creds = { |
4064 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4065 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4066 | }; | |
4067 | ||
f2b3ef9f JG |
4068 | return notification_client_list_send_evaluation(client_list, |
4069 | lttng_trigger_get_const_condition(trigger), evaluation, | |
4070 | lttng_trigger_get_credentials(trigger), | |
ff588497 | 4071 | &creds, |
f2b3ef9f JG |
4072 | client_handle_transmission_status_wrapper, state); |
4073 | } | |
4074 | ||
f37d0f86 JG |
4075 | /* |
4076 | * Permission checks relative to notification channel clients are performed | |
4077 | * here. Notice how object, client, and trigger credentials are involved in | |
4078 | * this check. | |
4079 | * | |
4080 | * The `object` credentials are the credentials associated with the "subject" | |
4081 | * of a condition. For instance, a `rotation completed` condition applies | |
4082 | * to a session. When that condition is met, it will produce an evaluation | |
4083 | * against a session. Hence, in this case, the `object` credentials are the | |
4084 | * credentials of the "subject" session. | |
4085 | * | |
4086 | * The `trigger` credentials are the credentials of the user that registered the | |
4087 | * trigger. | |
4088 | * | |
4089 | * The `client` credentials are the credentials of the user that created a given | |
4090 | * notification channel. | |
4091 | * | |
4092 | * In terms of visibility, it is expected that non-privilieged users can only | |
4093 | * register triggers against "their" objects (their own sessions and | |
4094 | * applications they are allowed to interact with). They can then open a | |
4095 | * notification channel and subscribe to notifications associated with those | |
4096 | * triggers. | |
4097 | * | |
4098 | * As for privilieged users, they can register triggers against the objects of | |
4099 | * other users. They can then subscribe to the notifications associated to their | |
4100 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4101 | * triggers owned by other users; they must create their own triggers. | |
4102 | * | |
4103 | * This is more a concern of usability than security. It would be difficult for | |
4104 | * a root user reliably subscribe to a specific set of conditions without | |
4105 | * interference from external users (those could, for instance, unregister | |
4106 | * their triggers). | |
4107 | */ | |
f2b3ef9f JG |
4108 | LTTNG_HIDDEN |
4109 | int notification_client_list_send_evaluation( | |
4110 | struct notification_client_list *client_list, | |
4111 | const struct lttng_condition *condition, | |
9b63a4aa | 4112 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4113 | const struct lttng_credentials *trigger_creds, |
4114 | const struct lttng_credentials *source_object_creds, | |
4115 | report_client_transmission_result_cb client_report, | |
4116 | void *user_data) | |
ab0ee2ca JG |
4117 | { |
4118 | int ret = 0; | |
c0a66c84 | 4119 | struct lttng_payload msg_payload; |
ab0ee2ca | 4120 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4121 | const struct lttng_notification notification = { |
f2b3ef9f | 4122 | .condition = (struct lttng_condition *) condition, |
9b63a4aa JG |
4123 | .evaluation = (struct lttng_evaluation *) evaluation, |
4124 | }; | |
3647288f JG |
4125 | struct lttng_notification_channel_message msg_header = { |
4126 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
4127 | }; | |
ab0ee2ca | 4128 | |
c0a66c84 | 4129 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4130 | |
c0a66c84 | 4131 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4132 | sizeof(msg_header)); |
ab0ee2ca JG |
4133 | if (ret) { |
4134 | goto end; | |
4135 | } | |
4136 | ||
c0a66c84 | 4137 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4138 | if (ret) { |
ab0ee2ca JG |
4139 | ERR("[notification-thread] Failed to serialize notification"); |
4140 | ret = -1; | |
4141 | goto end; | |
4142 | } | |
4143 | ||
3647288f | 4144 | /* Update payload size. */ |
505b2d90 JG |
4145 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4146 | ->size = (uint32_t)( | |
4147 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4148 | |
882093ee JR |
4149 | /* Update the payload number of fds. */ |
4150 | { | |
4151 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4152 | &msg_payload, 0, -1); | |
4153 | ||
4154 | ((struct lttng_notification_channel_message *) | |
4155 | msg_payload.buffer.data)->fds = (uint32_t) | |
4156 | lttng_payload_view_get_fd_handle_count(&pv); | |
4157 | } | |
4158 | ||
505b2d90 | 4159 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
4160 | cds_list_for_each_entry_safe(client_list_element, tmp, |
4161 | &client_list->list, node) { | |
f2b3ef9f | 4162 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4163 | struct notification_client *client = |
4164 | client_list_element->client; | |
4165 | ||
505b2d90 JG |
4166 | ret = 0; |
4167 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4168 | if (!client->communication.active) { |
4169 | /* | |
4170 | * Skip inactive client (protocol error or | |
4171 | * disconnecting). | |
4172 | */ | |
4173 | DBG("Skipping client at it is marked as inactive"); | |
4174 | goto skip_client; | |
4175 | } | |
4176 | ||
f2b3ef9f | 4177 | if (source_object_creds) { |
ff588497 JR |
4178 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4179 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4180 | client->uid != 0) { |
4181 | /* | |
4182 | * Client is not allowed to monitor this | |
4183 | * object. | |
4184 | */ | |
4185 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
6c24d3fd | 4186 | goto skip_client; |
f2b3ef9f | 4187 | } |
90843f49 JR |
4188 | } |
4189 | ||
ff588497 | 4190 | if (client->uid != lttng_credentials_get_uid(trigger_creds) && client->gid != lttng_credentials_get_gid(trigger_creds)) { |
90843f49 | 4191 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4192 | goto skip_client; |
ab0ee2ca JG |
4193 | } |
4194 | ||
4195 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
c0a66c84 | 4196 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4197 | |
4198 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4199 | /* |
4200 | * Outgoing data is already buffered for this client; | |
4201 | * drop the notification and enqueue a "dropped | |
4202 | * notification" message if this is the first dropped | |
4203 | * notification since the socket spilled-over to the | |
4204 | * queue. | |
4205 | */ | |
f2b3ef9f JG |
4206 | ret = client_notification_overflow(client); |
4207 | if (ret) { | |
6c24d3fd JG |
4208 | /* Fatal error. */ |
4209 | goto skip_client; | |
ab0ee2ca | 4210 | } |
ab0ee2ca JG |
4211 | } |
4212 | ||
882093ee | 4213 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4214 | if (ret) { |
6c24d3fd JG |
4215 | /* Fatal error. */ |
4216 | goto skip_client; | |
ab0ee2ca JG |
4217 | } |
4218 | ||
f2b3ef9f | 4219 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4220 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4221 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4222 | if (ret) { |
6c24d3fd JG |
4223 | /* Fatal error. */ |
4224 | goto end_unlock_list; | |
505b2d90 | 4225 | } |
6c24d3fd JG |
4226 | |
4227 | continue; | |
4228 | ||
4229 | skip_client: | |
505b2d90 JG |
4230 | pthread_mutex_unlock(&client->lock); |
4231 | if (ret) { | |
6c24d3fd | 4232 | /* Fatal error. */ |
505b2d90 | 4233 | goto end_unlock_list; |
ab0ee2ca JG |
4234 | } |
4235 | } | |
4236 | ret = 0; | |
505b2d90 JG |
4237 | |
4238 | end_unlock_list: | |
4239 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4240 | end: |
c0a66c84 | 4241 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4242 | return ret; |
4243 | } | |
4244 | ||
8b524060 FD |
4245 | static |
4246 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4247 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4248 | { |
4249 | int ret; | |
b9a8d78f FD |
4250 | uint64_t token; |
4251 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4252 | char *capture_buffer = NULL; |
4253 | size_t capture_buffer_size; | |
94078603 JR |
4254 | void *reception_buffer; |
4255 | size_t reception_size; | |
4256 | ||
fc4b93fa | 4257 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
b9a8d78f | 4258 | struct lttng_kernel_event_notifier_notification kernel_notification; |
94078603 | 4259 | |
b9a8d78f | 4260 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4261 | switch(domain) { |
4262 | case LTTNG_DOMAIN_UST: | |
4263 | reception_buffer = (void *) &ust_notification; | |
4264 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4265 | break; |
4266 | case LTTNG_DOMAIN_KERNEL: | |
4267 | reception_buffer = (void *) &kernel_notification; | |
4268 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4269 | break; |
4270 | default: | |
4271 | abort(); | |
4272 | } | |
4273 | ||
4274 | /* | |
4275 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4276 | * ensuring that read/write of tracer notifications are atomic. | |
4277 | */ | |
4278 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4279 | reception_size); | |
4280 | if (ret != reception_size) { | |
4281 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4282 | notification_pipe_read_fd, reception_size, ret); | |
4283 | ret = -1; | |
4284 | goto end; | |
4285 | } | |
4286 | ||
4287 | switch(domain) { | |
4288 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4289 | token = ust_notification.token; |
82b3cbf4 | 4290 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4291 | break; |
4292 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4293 | token = kernel_notification.token; |
bbd6675c | 4294 | capture_buffer_size = kernel_notification.capture_buf_size; |
94078603 JR |
4295 | break; |
4296 | default: | |
4297 | abort(); | |
4298 | } | |
4299 | ||
82b3cbf4 JR |
4300 | if (capture_buffer_size == 0) { |
4301 | capture_buffer = NULL; | |
4302 | goto skip_capture; | |
4303 | } | |
4304 | ||
4305 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
4306 | 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", | |
4307 | capture_buffer_size, MAX_CAPTURE_SIZE); | |
4308 | goto end; | |
4309 | } | |
4310 | ||
4311 | capture_buffer = zmalloc(capture_buffer_size); | |
4312 | if (!capture_buffer) { | |
4313 | ERR("[notification-thread] Failed to allocate capture buffer"); | |
4314 | goto end; | |
4315 | } | |
4316 | ||
4317 | /* Fetch additional payload (capture). */ | |
4318 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4319 | if (ret != capture_buffer_size) { | |
4320 | ERR("[notification-thread] Failed to read from event source pipe (fd = %i)", | |
4321 | notification_pipe_read_fd); | |
4322 | goto end; | |
4323 | } | |
4324 | ||
4325 | skip_capture: | |
4326 | notification = lttng_event_notifier_notification_create(token, domain, | |
4327 | capture_buffer, capture_buffer_size); | |
4328 | if (notification == NULL) { | |
4329 | goto end; | |
4330 | } | |
4331 | ||
4332 | /* | |
4333 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4334 | */ | |
4335 | capture_buffer = NULL; | |
4336 | ||
b9a8d78f | 4337 | end: |
82b3cbf4 | 4338 | free(capture_buffer); |
b9a8d78f FD |
4339 | return notification; |
4340 | } | |
4341 | ||
8b524060 FD |
4342 | static |
4343 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4344 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4345 | { |
b9a8d78f FD |
4346 | struct cds_lfht_node *node; |
4347 | struct cds_lfht_iter iter; | |
4348 | struct notification_trigger_tokens_ht_element *element; | |
8b524060 | 4349 | enum lttng_trigger_status trigger_status; |
b9a8d78f | 4350 | struct lttng_evaluation *evaluation = NULL; |
b9a8d78f FD |
4351 | enum action_executor_status executor_status; |
4352 | struct notification_client_list *client_list = NULL; | |
4353 | const char *trigger_name; | |
8b524060 | 4354 | int ret; |
7c920b63 | 4355 | unsigned int capture_count = 0; |
b9a8d78f | 4356 | |
94078603 JR |
4357 | /* Find triggers associated with this token. */ |
4358 | rcu_read_lock(); | |
4359 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4360 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4361 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4362 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4363 | if (caa_unlikely(!node)) { |
94078603 | 4364 | /* |
f1446131 JR |
4365 | * This is not an error, slow consumption of the tracer |
4366 | * notifications can lead to situations where a trigger is | |
4367 | * removed but we still get tracer notifications matching a | |
4368 | * trigger that no longer exists. | |
94078603 JR |
4369 | */ |
4370 | ret = 0; | |
4371 | goto end_unlock; | |
4372 | } | |
4373 | ||
4374 | element = caa_container_of(node, | |
4375 | struct notification_trigger_tokens_ht_element, | |
4376 | node); | |
4377 | ||
f1446131 JR |
4378 | if (!lttng_trigger_should_fire(element->trigger)) { |
4379 | ret = 0; | |
4380 | goto end_unlock; | |
4381 | } | |
94078603 | 4382 | |
f1446131 | 4383 | lttng_trigger_fire(element->trigger); |
94078603 | 4384 | |
b9a8d78f FD |
4385 | trigger_status = lttng_trigger_get_name(element->trigger, &trigger_name); |
4386 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
4387 | ||
d602bd6a | 4388 | if (lttng_condition_on_event_get_capture_descriptor_count( |
7c920b63 PP |
4389 | lttng_trigger_get_const_condition(element->trigger), |
4390 | &capture_count) != LTTNG_CONDITION_STATUS_OK) { | |
4391 | ERR("Failed to get capture count"); | |
4392 | ret = -1; | |
4393 | goto end; | |
4394 | } | |
4395 | ||
4396 | if (!notification->capture_buffer && capture_count != 0) { | |
4397 | ERR("Expected capture but capture buffer is null"); | |
4398 | ret = -1; | |
4399 | goto end; | |
4400 | } | |
4401 | ||
d602bd6a | 4402 | evaluation = lttng_evaluation_on_event_create( |
7c920b63 PP |
4403 | container_of(lttng_trigger_get_const_condition( |
4404 | element->trigger), | |
d602bd6a | 4405 | struct lttng_condition_on_event, |
7c920b63 PP |
4406 | parent), |
4407 | trigger_name, | |
4408 | notification->capture_buffer, | |
4409 | notification->capture_buf_size, false); | |
4410 | ||
f1446131 | 4411 | if (evaluation == NULL) { |
b9a8d78f | 4412 | ERR("[notification-thread] Failed to create event rule hit evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4413 | ret = -1; |
4414 | goto end_unlock; | |
4415 | } | |
f1446131 JR |
4416 | client_list = get_client_list_from_condition(state, |
4417 | lttng_trigger_get_const_condition(element->trigger)); | |
4418 | executor_status = action_executor_enqueue(state->executor, | |
4419 | element->trigger, evaluation, NULL, client_list); | |
4420 | switch (executor_status) { | |
4421 | case ACTION_EXECUTOR_STATUS_OK: | |
4422 | ret = 0; | |
4423 | break; | |
4424 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4425 | { | |
4426 | struct notification_client_list_element *client_list_element, | |
4427 | *tmp; | |
4428 | ||
4429 | /* | |
4430 | * Not a fatal error; this is expected and simply means the | |
4431 | * executor has too much work queued already. | |
4432 | */ | |
4433 | ret = 0; | |
4434 | ||
4435 | /* No clients subscribed to notifications for this trigger. */ | |
4436 | if (!client_list) { | |
4437 | break; | |
4438 | } | |
4439 | ||
4440 | /* Warn clients that a notification (or more) was dropped. */ | |
4441 | pthread_mutex_lock(&client_list->lock); | |
4442 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
4443 | &client_list->list, node) { | |
4444 | enum client_transmission_status transmission_status; | |
4445 | struct notification_client *client = | |
4446 | client_list_element->client; | |
4447 | ||
4448 | pthread_mutex_lock(&client->lock); | |
4449 | ret = client_notification_overflow(client); | |
4450 | if (ret) { | |
4451 | /* Fatal error. */ | |
4452 | goto next_client; | |
4453 | } | |
4454 | ||
4455 | transmission_status = | |
4456 | client_flush_outgoing_queue(client); | |
4457 | ret = client_handle_transmission_status( | |
4458 | client, transmission_status, state); | |
4459 | if (ret) { | |
4460 | /* Fatal error. */ | |
4461 | goto next_client; | |
4462 | } | |
4463 | next_client: | |
4464 | pthread_mutex_unlock(&client->lock); | |
4465 | if (ret) { | |
4466 | break; | |
4467 | } | |
4468 | } | |
4469 | ||
4470 | pthread_mutex_unlock(&client_list->lock); | |
4471 | break; | |
4472 | } | |
98dfca79 | 4473 | case ACTION_EXECUTOR_STATUS_INVALID: |
f1446131 JR |
4474 | case ACTION_EXECUTOR_STATUS_ERROR: |
4475 | /* Fatal error, shut down everything. */ | |
4476 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4477 | ret = -1; | |
4478 | goto end_unlock; | |
4479 | default: | |
4480 | /* Unhandled error. */ | |
4481 | abort(); | |
4482 | } | |
94078603 JR |
4483 | |
4484 | end_unlock: | |
f1446131 | 4485 | notification_client_list_put(client_list); |
94078603 | 4486 | rcu_read_unlock(); |
7c920b63 | 4487 | end: |
8b524060 FD |
4488 | return ret; |
4489 | } | |
4490 | ||
4491 | static | |
4492 | int handle_one_event_notifier_notification( | |
4493 | struct notification_thread_state *state, | |
4494 | int pipe, enum lttng_domain_type domain) | |
4495 | { | |
82b3cbf4 | 4496 | int ret = 0; |
8b524060 FD |
4497 | struct lttng_event_notifier_notification *notification = NULL; |
4498 | ||
4499 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4500 | if (notification == NULL) { | |
82b3cbf4 | 4501 | /* Reception failed, don't consider it fatal. */ |
8b524060 FD |
4502 | ERR("[notification-thread] Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
4503 | pipe, lttng_domain_type_str(domain)); | |
8b524060 FD |
4504 | goto end; |
4505 | } | |
4506 | ||
4507 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4508 | if (ret) { | |
4509 | ERR("[notification-thread] Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", | |
4510 | pipe, lttng_domain_type_str(domain)); | |
4511 | goto end; | |
4512 | } | |
4513 | ||
94078603 | 4514 | end: |
8b524060 | 4515 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4516 | return ret; |
4517 | } | |
4518 | ||
8b524060 FD |
4519 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4520 | int pipe, enum lttng_domain_type domain) | |
4521 | { | |
4522 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4523 | } | |
4524 | ||
ab0ee2ca JG |
4525 | int handle_notification_thread_channel_sample( |
4526 | struct notification_thread_state *state, int pipe, | |
4527 | enum lttng_domain_type domain) | |
4528 | { | |
4529 | int ret = 0; | |
4530 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4531 | struct channel_info *channel_info; |
4532 | struct cds_lfht_node *node; | |
4533 | struct cds_lfht_iter iter; | |
4534 | struct lttng_channel_trigger_list *trigger_list; | |
4535 | struct lttng_trigger_list_element *trigger_list_element; | |
4536 | bool previous_sample_available = false; | |
e8360425 JD |
4537 | struct channel_state_sample previous_sample, latest_sample; |
4538 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4539 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4540 | |
4541 | /* | |
4542 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4543 | * ensuring that read/write of sampling messages are atomic. | |
4544 | */ | |
7c2551ef | 4545 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
4546 | if (ret != sizeof(sample_msg)) { |
4547 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
4548 | pipe); | |
4549 | ret = -1; | |
4550 | goto end; | |
4551 | } | |
4552 | ||
4553 | ret = 0; | |
4554 | latest_sample.key.key = sample_msg.key; | |
4555 | latest_sample.key.domain = domain; | |
4556 | latest_sample.highest_usage = sample_msg.highest; | |
4557 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4558 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4559 | |
4560 | rcu_read_lock(); | |
4561 | ||
4562 | /* Retrieve the channel's informations */ | |
4563 | cds_lfht_lookup(state->channels_ht, | |
4564 | hash_channel_key(&latest_sample.key), | |
4565 | match_channel_info, | |
4566 | &latest_sample.key, | |
4567 | &iter); | |
4568 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4569 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4570 | /* |
4571 | * Not an error since the consumer can push a sample to the pipe | |
4572 | * and the rest of the session daemon could notify us of the | |
4573 | * channel's destruction before we get a chance to process that | |
4574 | * sample. | |
4575 | */ | |
4576 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
4577 | latest_sample.key.key, | |
526200e4 | 4578 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4579 | goto end_unlock; |
4580 | } | |
4581 | channel_info = caa_container_of(node, struct channel_info, | |
4582 | channels_ht_node); | |
e8360425 | 4583 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4584 | channel_info->name, |
ab0ee2ca | 4585 | latest_sample.key.key, |
8abe313a | 4586 | channel_info->session_info->name, |
ab0ee2ca | 4587 | latest_sample.highest_usage, |
e8360425 JD |
4588 | latest_sample.lowest_usage, |
4589 | latest_sample.channel_total_consumed); | |
4590 | ||
4591 | previous_session_consumed_total = | |
4592 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4593 | |
4594 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4595 | cds_lfht_lookup(state->channel_state_ht, | |
4596 | hash_channel_key(&latest_sample.key), | |
4597 | match_channel_state_sample, | |
4598 | &latest_sample.key, | |
4599 | &iter); | |
4600 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4601 | if (caa_likely(node)) { |
ab0ee2ca JG |
4602 | struct channel_state_sample *stored_sample; |
4603 | ||
4604 | /* Update the sample stored. */ | |
4605 | stored_sample = caa_container_of(node, | |
4606 | struct channel_state_sample, | |
4607 | channel_state_ht_node); | |
e8360425 | 4608 | |
ab0ee2ca JG |
4609 | memcpy(&previous_sample, stored_sample, |
4610 | sizeof(previous_sample)); | |
4611 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4612 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4613 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4614 | previous_sample_available = true; |
e8360425 JD |
4615 | |
4616 | latest_session_consumed_total = | |
4617 | previous_session_consumed_total + | |
4618 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4619 | } else { |
4620 | /* | |
4621 | * This is the channel's first sample, allocate space for and | |
4622 | * store the new sample. | |
4623 | */ | |
4624 | struct channel_state_sample *stored_sample; | |
4625 | ||
4626 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4627 | if (!stored_sample) { | |
4628 | ret = -1; | |
4629 | goto end_unlock; | |
4630 | } | |
4631 | ||
4632 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4633 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4634 | cds_lfht_add(state->channel_state_ht, | |
4635 | hash_channel_key(&stored_sample->key), | |
4636 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4637 | |
4638 | latest_session_consumed_total = | |
4639 | previous_session_consumed_total + | |
4640 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4641 | } |
4642 | ||
e8360425 JD |
4643 | channel_info->session_info->consumed_data_size = |
4644 | latest_session_consumed_total; | |
4645 | ||
ab0ee2ca JG |
4646 | /* Find triggers associated with this channel. */ |
4647 | cds_lfht_lookup(state->channel_triggers_ht, | |
4648 | hash_channel_key(&latest_sample.key), | |
4649 | match_channel_trigger_list, | |
4650 | &latest_sample.key, | |
4651 | &iter); | |
4652 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4653 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4654 | goto end_unlock; |
4655 | } | |
4656 | ||
f2b3ef9f | 4657 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4658 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4659 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4660 | }; |
4661 | ||
ab0ee2ca JG |
4662 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4663 | channel_triggers_ht_node); | |
4664 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4665 | node) { |
9b63a4aa | 4666 | const struct lttng_condition *condition; |
f2b3ef9f | 4667 | struct lttng_trigger *trigger; |
505b2d90 | 4668 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4669 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4670 | enum action_executor_status executor_status; |
ab0ee2ca | 4671 | |
505b2d90 | 4672 | ret = 0; |
ab0ee2ca | 4673 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4674 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 4675 | assert(condition); |
ab0ee2ca JG |
4676 | |
4677 | /* | |
4678 | * Check if any client is subscribed to the result of this | |
4679 | * evaluation. | |
4680 | */ | |
ed327204 | 4681 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4682 | |
ed327204 | 4683 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4684 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4685 | &latest_sample, |
4686 | previous_session_consumed_total, | |
4687 | latest_session_consumed_total, | |
4688 | channel_info); | |
4689 | if (caa_unlikely(ret)) { | |
505b2d90 | 4690 | goto put_list; |
ab0ee2ca JG |
4691 | } |
4692 | ||
e8360425 | 4693 | if (caa_likely(!evaluation)) { |
505b2d90 | 4694 | goto put_list; |
ab0ee2ca JG |
4695 | } |
4696 | ||
f8522f5c JR |
4697 | if (!lttng_trigger_should_fire(trigger)) { |
4698 | goto put_list; | |
4699 | } | |
4700 | ||
4701 | lttng_trigger_fire(trigger); | |
4702 | ||
f2b3ef9f JG |
4703 | /* |
4704 | * Ownership of `evaluation` transferred to the action executor | |
4705 | * no matter the result. | |
4706 | */ | |
4707 | executor_status = action_executor_enqueue(state->executor, | |
4708 | trigger, evaluation, &channel_creds, | |
4709 | client_list); | |
4710 | evaluation = NULL; | |
4711 | switch (executor_status) { | |
4712 | case ACTION_EXECUTOR_STATUS_OK: | |
4713 | break; | |
4714 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4715 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4716 | /* | |
4717 | * TODO Add trigger identification (name/id) when | |
4718 | * it is added to the API. | |
4719 | */ | |
4720 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4721 | ret = -1; | |
4722 | goto put_list; | |
4723 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4724 | /* | |
4725 | * TODO Add trigger identification (name/id) when | |
4726 | * it is added to the API. | |
4727 | * | |
4728 | * Not a fatal error. | |
4729 | */ | |
4730 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4731 | ret = 0; | |
4732 | goto put_list; | |
4733 | default: | |
4734 | abort(); | |
4735 | } | |
4736 | ||
505b2d90 JG |
4737 | put_list: |
4738 | notification_client_list_put(client_list); | |
e0b5f87b | 4739 | if (caa_unlikely(ret)) { |
505b2d90 | 4740 | break; |
ab0ee2ca JG |
4741 | } |
4742 | } | |
4743 | end_unlock: | |
4744 | rcu_read_unlock(); | |
4745 | end: | |
4746 | return ret; | |
4747 | } |