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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> |
e393070a | 31 | #include <lttng/condition/on-event-internal.h> |
d02d7404 | 32 | #include <lttng/domain-internal.h> |
ab0ee2ca | 33 | #include <lttng/notification/channel-internal.h> |
85c06c44 | 34 | #include <lttng/trigger/trigger-internal.h> |
959e3c66 | 35 | #include <lttng/event-rule/event-rule-internal.h> |
1da26331 | 36 | |
ab0ee2ca JG |
37 | #include <time.h> |
38 | #include <unistd.h> | |
39 | #include <assert.h> | |
40 | #include <inttypes.h> | |
d53ea4e4 | 41 | #include <fcntl.h> |
ab0ee2ca | 42 | |
e98a976a | 43 | #include "condition-internal.h" |
90aa04a1 | 44 | #include "event-notifier-error-accounting.h" |
1da26331 JG |
45 | #include "notification-thread.h" |
46 | #include "notification-thread-events.h" | |
47 | #include "notification-thread-commands.h" | |
48 | #include "lttng-sessiond.h" | |
49 | #include "kernel.h" | |
50 | ||
ab0ee2ca JG |
51 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
52 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
53 | ||
82b3cbf4 JR |
54 | /* The tracers currently limit the capture size to PIPE_BUF (4kb on linux). */ |
55 | #define MAX_CAPTURE_SIZE (PIPE_BUF) | |
56 | ||
51eab943 JG |
57 | enum lttng_object_type { |
58 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
59 | LTTNG_OBJECT_TYPE_NONE, | |
60 | LTTNG_OBJECT_TYPE_CHANNEL, | |
61 | LTTNG_OBJECT_TYPE_SESSION, | |
62 | }; | |
63 | ||
ab0ee2ca | 64 | struct lttng_trigger_list_element { |
9e0bb80e | 65 | /* No ownership of the trigger object is assumed. */ |
f2b3ef9f | 66 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
67 | struct cds_list_head node; |
68 | }; | |
69 | ||
70 | struct lttng_channel_trigger_list { | |
71 | struct channel_key channel_key; | |
ea9a44f0 | 72 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 73 | struct cds_list_head list; |
ea9a44f0 | 74 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 75 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
76 | /* call_rcu delayed reclaim. */ |
77 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
78 | }; |
79 | ||
ea9a44f0 JG |
80 | /* |
81 | * List of triggers applying to a given session. | |
82 | * | |
83 | * See: | |
84 | * - lttng_session_trigger_list_create() | |
85 | * - lttng_session_trigger_list_build() | |
86 | * - lttng_session_trigger_list_destroy() | |
87 | * - lttng_session_trigger_list_add() | |
88 | */ | |
89 | struct lttng_session_trigger_list { | |
90 | /* | |
91 | * Not owned by this; points to the session_info structure's | |
92 | * session name. | |
93 | */ | |
94 | const char *session_name; | |
95 | /* List of struct lttng_trigger_list_element. */ | |
96 | struct cds_list_head list; | |
97 | /* Node in the session_triggers_ht */ | |
98 | struct cds_lfht_node session_triggers_ht_node; | |
99 | /* | |
100 | * Weak reference to the notification system's session triggers | |
101 | * hashtable. | |
102 | * | |
103 | * The session trigger list structure structure is owned by | |
104 | * the session's session_info. | |
105 | * | |
106 | * The session_info is kept alive the the channel_infos holding a | |
107 | * reference to it (reference counting). When those channels are | |
108 | * destroyed (at runtime or on teardown), the reference they hold | |
109 | * to the session_info are released. On destruction of session_info, | |
110 | * session_info_destroy() will remove the list of triggers applying | |
111 | * to this session from the notification system's state. | |
112 | * | |
113 | * This implies that the session_triggers_ht must be destroyed | |
114 | * after the channels. | |
115 | */ | |
116 | struct cds_lfht *session_triggers_ht; | |
117 | /* Used for delayed RCU reclaim. */ | |
118 | struct rcu_head rcu_node; | |
119 | }; | |
120 | ||
ab0ee2ca JG |
121 | struct lttng_trigger_ht_element { |
122 | struct lttng_trigger *trigger; | |
123 | struct cds_lfht_node node; | |
242388e4 | 124 | struct cds_lfht_node node_by_name_uid; |
83b934ad MD |
125 | /* call_rcu delayed reclaim. */ |
126 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
127 | }; |
128 | ||
129 | struct lttng_condition_list_element { | |
130 | struct lttng_condition *condition; | |
131 | struct cds_list_head node; | |
132 | }; | |
133 | ||
ab0ee2ca JG |
134 | struct channel_state_sample { |
135 | struct channel_key key; | |
136 | struct cds_lfht_node channel_state_ht_node; | |
137 | uint64_t highest_usage; | |
138 | uint64_t lowest_usage; | |
e8360425 | 139 | uint64_t channel_total_consumed; |
83b934ad MD |
140 | /* call_rcu delayed reclaim. */ |
141 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
142 | }; |
143 | ||
e4db5ace | 144 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 145 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 146 | struct lttng_evaluation **evaluation, |
e8360425 JD |
147 | const struct notification_thread_state *state, |
148 | const struct channel_state_sample *previous_sample, | |
149 | const struct channel_state_sample *latest_sample, | |
150 | uint64_t previous_session_consumed_total, | |
151 | uint64_t latest_session_consumed_total, | |
152 | struct channel_info *channel_info); | |
e4db5ace | 153 | static |
9b63a4aa JG |
154 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
155 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
156 | struct notification_client_list *client_list, |
157 | struct notification_thread_state *state, | |
158 | uid_t channel_uid, gid_t channel_gid); | |
159 | ||
8abe313a | 160 | |
ea9a44f0 | 161 | /* session_info API */ |
8abe313a JG |
162 | static |
163 | void session_info_destroy(void *_data); | |
164 | static | |
165 | void session_info_get(struct session_info *session_info); | |
166 | static | |
167 | void session_info_put(struct session_info *session_info); | |
168 | static | |
169 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 170 | uid_t uid, gid_t gid, |
1eee26c5 JG |
171 | struct lttng_session_trigger_list *trigger_list, |
172 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
173 | static |
174 | void session_info_add_channel(struct session_info *session_info, | |
175 | struct channel_info *channel_info); | |
176 | static | |
177 | void session_info_remove_channel(struct session_info *session_info, | |
178 | struct channel_info *channel_info); | |
179 | ||
ea9a44f0 JG |
180 | /* lttng_session_trigger_list API */ |
181 | static | |
182 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
183 | const char *session_name, | |
184 | struct cds_lfht *session_triggers_ht); | |
185 | static | |
186 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
187 | const struct notification_thread_state *state, | |
188 | const char *session_name); | |
189 | static | |
190 | void lttng_session_trigger_list_destroy( | |
191 | struct lttng_session_trigger_list *list); | |
192 | static | |
193 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 194 | struct lttng_trigger *trigger); |
ea9a44f0 | 195 | |
f2b3ef9f JG |
196 | static |
197 | int client_handle_transmission_status( | |
198 | struct notification_client *client, | |
199 | enum client_transmission_status transmission_status, | |
200 | struct notification_thread_state *state); | |
ea9a44f0 | 201 | |
8b524060 FD |
202 | static |
203 | int handle_one_event_notifier_notification( | |
204 | struct notification_thread_state *state, | |
205 | int pipe, enum lttng_domain_type domain); | |
206 | ||
242388e4 JR |
207 | static |
208 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node); | |
209 | ||
ab0ee2ca | 210 | static |
ac1889bf | 211 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
212 | { |
213 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
214 | const int socket = (int) (intptr_t) key; |
215 | const struct notification_client *client = caa_container_of(node, | |
216 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 217 | |
ac1889bf JG |
218 | return client->socket == socket; |
219 | } | |
220 | ||
221 | static | |
222 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
223 | { | |
224 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
225 | const notification_client_id id = *((notification_client_id *) key); | |
226 | const struct notification_client *client = caa_container_of( | |
227 | node, struct notification_client, client_id_ht_node); | |
ab0ee2ca | 228 | |
ac1889bf | 229 | return client->id == id; |
ab0ee2ca JG |
230 | } |
231 | ||
232 | static | |
233 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
234 | { | |
235 | struct channel_key *channel_key = (struct channel_key *) key; | |
236 | struct lttng_channel_trigger_list *trigger_list; | |
237 | ||
238 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
239 | channel_triggers_ht_node); | |
240 | ||
241 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
242 | (channel_key->domain == trigger_list->channel_key.domain)); | |
243 | } | |
244 | ||
51eab943 JG |
245 | static |
246 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
247 | { | |
248 | const char *session_name = (const char *) key; | |
249 | struct lttng_session_trigger_list *trigger_list; | |
250 | ||
251 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
252 | session_triggers_ht_node); | |
253 | ||
254 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
255 | } | |
256 | ||
ab0ee2ca JG |
257 | static |
258 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
259 | { | |
260 | struct channel_key *channel_key = (struct channel_key *) key; | |
261 | struct channel_state_sample *sample; | |
262 | ||
263 | sample = caa_container_of(node, struct channel_state_sample, | |
264 | channel_state_ht_node); | |
265 | ||
266 | return !!((channel_key->key == sample->key.key) && | |
267 | (channel_key->domain == sample->key.domain)); | |
268 | } | |
269 | ||
270 | static | |
271 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
272 | { | |
273 | struct channel_key *channel_key = (struct channel_key *) key; | |
274 | struct channel_info *channel_info; | |
275 | ||
276 | channel_info = caa_container_of(node, struct channel_info, | |
277 | channels_ht_node); | |
278 | ||
279 | return !!((channel_key->key == channel_info->key.key) && | |
280 | (channel_key->domain == channel_info->key.domain)); | |
281 | } | |
282 | ||
283 | static | |
242388e4 | 284 | int match_trigger(struct cds_lfht_node *node, const void *key) |
ab0ee2ca | 285 | { |
242388e4 JR |
286 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; |
287 | struct lttng_trigger_ht_element *trigger_ht_element; | |
ab0ee2ca | 288 | |
242388e4 | 289 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, |
ab0ee2ca | 290 | node); |
ab0ee2ca | 291 | |
242388e4 | 292 | return !!lttng_trigger_is_equal(trigger_key, trigger_ht_element->trigger); |
ab0ee2ca JG |
293 | } |
294 | ||
e7c93cf9 JR |
295 | static |
296 | int match_trigger_token(struct cds_lfht_node *node, const void *key) | |
297 | { | |
298 | const uint64_t *_key = key; | |
299 | struct notification_trigger_tokens_ht_element *element; | |
300 | ||
301 | element = caa_container_of(node, | |
302 | struct notification_trigger_tokens_ht_element, node); | |
303 | return *_key == element->token; | |
304 | } | |
305 | ||
ab0ee2ca JG |
306 | static |
307 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
308 | { | |
309 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
310 | struct notification_client_list *client_list; | |
f82f93a1 | 311 | const struct lttng_condition *condition; |
ab0ee2ca JG |
312 | |
313 | assert(condition_key); | |
314 | ||
315 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 316 | notification_trigger_clients_ht_node); |
f82f93a1 | 317 | condition = lttng_trigger_get_const_condition(client_list->trigger); |
ab0ee2ca JG |
318 | |
319 | return !!lttng_condition_is_equal(condition_key, condition); | |
320 | } | |
321 | ||
f82f93a1 JG |
322 | static |
323 | int match_session(struct cds_lfht_node *node, const void *key) | |
324 | { | |
325 | const char *name = key; | |
326 | struct session_info *session_info = caa_container_of( | |
327 | node, struct session_info, sessions_ht_node); | |
328 | ||
329 | return !strcmp(session_info->name, name); | |
330 | } | |
331 | ||
6900ae81 FD |
332 | static |
333 | const char *notification_command_type_str( | |
334 | enum notification_thread_command_type type) | |
335 | { | |
336 | switch (type) { | |
337 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
338 | return "REGISTER_TRIGGER"; | |
339 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
340 | return "UNREGISTER_TRIGGER"; | |
341 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
342 | return "ADD_CHANNEL"; | |
343 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
344 | return "REMOVE_CHANNEL"; | |
345 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: | |
346 | return "SESSION_ROTATION_ONGOING"; | |
347 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: | |
348 | return "SESSION_ROTATION_COMPLETED"; | |
349 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: | |
350 | return "ADD_TRACER_EVENT_SOURCE"; | |
351 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
352 | return "REMOVE_TRACER_EVENT_SOURCE"; | |
353 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: | |
354 | return "LIST_TRIGGERS"; | |
355 | case NOTIFICATION_COMMAND_TYPE_QUIT: | |
356 | return "QUIT"; | |
357 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: | |
358 | return "CLIENT_COMMUNICATION_UPDATE"; | |
359 | default: | |
360 | abort(); | |
361 | } | |
362 | } | |
363 | ||
242388e4 JR |
364 | /* |
365 | * Match trigger based on name and credentials only. | |
366 | * Name duplication is NOT allowed for the same uid. | |
367 | */ | |
368 | static | |
369 | int match_trigger_by_name_uid(struct cds_lfht_node *node, | |
370 | const void *key) | |
371 | { | |
372 | bool match = false; | |
373 | const char *name; | |
374 | const char *key_name; | |
375 | enum lttng_trigger_status status; | |
376 | const struct lttng_credentials *key_creds; | |
377 | const struct lttng_credentials *node_creds; | |
378 | const struct lttng_trigger *trigger_key = | |
379 | (const struct lttng_trigger *) key; | |
380 | const struct lttng_trigger_ht_element *trigger_ht_element = | |
381 | caa_container_of(node, | |
382 | struct lttng_trigger_ht_element, | |
383 | node_by_name_uid); | |
384 | ||
385 | status = lttng_trigger_get_name(trigger_ht_element->trigger, &name); | |
386 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
387 | ||
388 | status = lttng_trigger_get_name(trigger_key, &key_name); | |
389 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
390 | ||
391 | /* Compare the names. */ | |
392 | if (strcmp(name, key_name) != 0) { | |
393 | goto end; | |
394 | } | |
395 | ||
396 | /* Compare the owners' UIDs. */ | |
397 | key_creds = lttng_trigger_get_credentials(trigger_key); | |
398 | node_creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
399 | ||
400 | match = lttng_credentials_is_equal_uid(key_creds, node_creds); | |
401 | ||
402 | end: | |
403 | return match; | |
404 | } | |
405 | ||
406 | /* | |
407 | * Hash trigger based on name and credentials only. | |
408 | */ | |
409 | static | |
410 | unsigned long hash_trigger_by_name_uid(const struct lttng_trigger *trigger) | |
411 | { | |
412 | unsigned long hash = 0; | |
413 | const struct lttng_credentials *trigger_creds; | |
414 | const char *trigger_name; | |
415 | enum lttng_trigger_status status; | |
416 | ||
417 | status = lttng_trigger_get_name(trigger, &trigger_name); | |
418 | if (status == LTTNG_TRIGGER_STATUS_OK) { | |
419 | hash = hash_key_str(trigger_name, lttng_ht_seed); | |
420 | } | |
421 | ||
422 | trigger_creds = lttng_trigger_get_credentials(trigger); | |
423 | hash ^= hash_key_ulong((void *) (unsigned long) LTTNG_OPTIONAL_GET(trigger_creds->uid), | |
424 | lttng_ht_seed); | |
425 | ||
426 | return hash; | |
427 | } | |
428 | ||
e4db5ace JR |
429 | static |
430 | unsigned long hash_channel_key(struct channel_key *key) | |
431 | { | |
432 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
433 | unsigned long domain_hash = hash_key_ulong( | |
434 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
435 | ||
436 | return key_hash ^ domain_hash; | |
437 | } | |
438 | ||
ac1889bf JG |
439 | static |
440 | unsigned long hash_client_socket(int socket) | |
441 | { | |
442 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
443 | } | |
444 | ||
445 | static | |
446 | unsigned long hash_client_id(notification_client_id id) | |
447 | { | |
448 | return hash_key_u64(&id, lttng_ht_seed); | |
449 | } | |
450 | ||
f82f93a1 JG |
451 | /* |
452 | * Get the type of object to which a given condition applies. Bindings let | |
453 | * the notification system evaluate a trigger's condition when a given | |
454 | * object's state is updated. | |
455 | * | |
456 | * For instance, a condition bound to a channel will be evaluated everytime | |
457 | * the channel's state is changed by a channel monitoring sample. | |
458 | */ | |
459 | static | |
460 | enum lttng_object_type get_condition_binding_object( | |
461 | const struct lttng_condition *condition) | |
462 | { | |
463 | switch (lttng_condition_get_type(condition)) { | |
464 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
465 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
466 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 467 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
468 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
469 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
470 | return LTTNG_OBJECT_TYPE_SESSION; | |
d602bd6a | 471 | case LTTNG_CONDITION_TYPE_ON_EVENT: |
959e3c66 | 472 | return LTTNG_OBJECT_TYPE_NONE; |
f82f93a1 JG |
473 | default: |
474 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
475 | } | |
476 | } | |
477 | ||
83b934ad MD |
478 | static |
479 | void free_channel_info_rcu(struct rcu_head *node) | |
480 | { | |
481 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
482 | } | |
483 | ||
ab0ee2ca JG |
484 | static |
485 | void channel_info_destroy(struct channel_info *channel_info) | |
486 | { | |
487 | if (!channel_info) { | |
488 | return; | |
489 | } | |
490 | ||
8abe313a JG |
491 | if (channel_info->session_info) { |
492 | session_info_remove_channel(channel_info->session_info, | |
493 | channel_info); | |
494 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 495 | } |
8abe313a JG |
496 | if (channel_info->name) { |
497 | free(channel_info->name); | |
ab0ee2ca | 498 | } |
83b934ad MD |
499 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
500 | } | |
501 | ||
502 | static | |
503 | void free_session_info_rcu(struct rcu_head *node) | |
504 | { | |
505 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
506 | } |
507 | ||
8abe313a | 508 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 509 | static |
8abe313a | 510 | void session_info_destroy(void *_data) |
ab0ee2ca | 511 | { |
8abe313a | 512 | struct session_info *session_info = _data; |
3b68d0a3 | 513 | int ret; |
ab0ee2ca | 514 | |
8abe313a JG |
515 | assert(session_info); |
516 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
517 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
518 | if (ret) { | |
4c3f302b | 519 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 520 | } |
8abe313a | 521 | } |
ea9a44f0 | 522 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
523 | |
524 | rcu_read_lock(); | |
525 | cds_lfht_del(session_info->sessions_ht, | |
526 | &session_info->sessions_ht_node); | |
527 | rcu_read_unlock(); | |
8abe313a | 528 | free(session_info->name); |
83b934ad | 529 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 530 | } |
ab0ee2ca | 531 | |
8abe313a JG |
532 | static |
533 | void session_info_get(struct session_info *session_info) | |
534 | { | |
535 | if (!session_info) { | |
536 | return; | |
537 | } | |
538 | lttng_ref_get(&session_info->ref); | |
539 | } | |
540 | ||
541 | static | |
542 | void session_info_put(struct session_info *session_info) | |
543 | { | |
544 | if (!session_info) { | |
545 | return; | |
ab0ee2ca | 546 | } |
8abe313a JG |
547 | lttng_ref_put(&session_info->ref); |
548 | } | |
549 | ||
550 | static | |
ea9a44f0 | 551 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
552 | struct lttng_session_trigger_list *trigger_list, |
553 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
554 | { |
555 | struct session_info *session_info; | |
ab0ee2ca | 556 | |
8abe313a | 557 | assert(name); |
ab0ee2ca | 558 | |
8abe313a JG |
559 | session_info = zmalloc(sizeof(*session_info)); |
560 | if (!session_info) { | |
561 | goto end; | |
562 | } | |
563 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
564 | ||
565 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
566 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
567 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
568 | goto error; |
569 | } | |
8abe313a JG |
570 | |
571 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
572 | session_info->name = strdup(name); | |
573 | if (!session_info->name) { | |
ab0ee2ca JG |
574 | goto error; |
575 | } | |
8abe313a JG |
576 | session_info->uid = uid; |
577 | session_info->gid = gid; | |
ea9a44f0 | 578 | session_info->trigger_list = trigger_list; |
1eee26c5 | 579 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
580 | end: |
581 | return session_info; | |
582 | error: | |
583 | session_info_put(session_info); | |
584 | return NULL; | |
585 | } | |
586 | ||
587 | static | |
588 | void session_info_add_channel(struct session_info *session_info, | |
589 | struct channel_info *channel_info) | |
590 | { | |
591 | rcu_read_lock(); | |
592 | cds_lfht_add(session_info->channel_infos_ht, | |
593 | hash_channel_key(&channel_info->key), | |
594 | &channel_info->session_info_channels_ht_node); | |
595 | rcu_read_unlock(); | |
596 | } | |
597 | ||
598 | static | |
599 | void session_info_remove_channel(struct session_info *session_info, | |
600 | struct channel_info *channel_info) | |
601 | { | |
602 | rcu_read_lock(); | |
603 | cds_lfht_del(session_info->channel_infos_ht, | |
604 | &channel_info->session_info_channels_ht_node); | |
605 | rcu_read_unlock(); | |
606 | } | |
607 | ||
608 | static | |
609 | struct channel_info *channel_info_create(const char *channel_name, | |
610 | struct channel_key *channel_key, uint64_t channel_capacity, | |
611 | struct session_info *session_info) | |
612 | { | |
613 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
614 | ||
615 | if (!channel_info) { | |
616 | goto end; | |
617 | } | |
618 | ||
ab0ee2ca | 619 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
620 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
621 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
622 | channel_info->capacity = channel_capacity; | |
623 | ||
624 | channel_info->name = strdup(channel_name); | |
625 | if (!channel_info->name) { | |
626 | goto error; | |
627 | } | |
628 | ||
629 | /* | |
630 | * Set the references between session and channel infos: | |
631 | * - channel_info holds a strong reference to session_info | |
632 | * - session_info holds a weak reference to channel_info | |
633 | */ | |
634 | session_info_get(session_info); | |
635 | session_info_add_channel(session_info, channel_info); | |
636 | channel_info->session_info = session_info; | |
ab0ee2ca | 637 | end: |
8abe313a | 638 | return channel_info; |
ab0ee2ca | 639 | error: |
8abe313a | 640 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
641 | return NULL; |
642 | } | |
643 | ||
f2b3ef9f | 644 | LTTNG_HIDDEN |
505b2d90 JG |
645 | bool notification_client_list_get(struct notification_client_list *list) |
646 | { | |
647 | return urcu_ref_get_unless_zero(&list->ref); | |
648 | } | |
649 | ||
650 | static | |
651 | void free_notification_client_list_rcu(struct rcu_head *node) | |
652 | { | |
653 | free(caa_container_of(node, struct notification_client_list, | |
654 | rcu_node)); | |
655 | } | |
656 | ||
657 | static | |
658 | void notification_client_list_release(struct urcu_ref *list_ref) | |
659 | { | |
660 | struct notification_client_list *list = | |
661 | container_of(list_ref, typeof(*list), ref); | |
662 | struct notification_client_list_element *client_list_element, *tmp; | |
663 | ||
664 | if (list->notification_trigger_clients_ht) { | |
665 | rcu_read_lock(); | |
666 | cds_lfht_del(list->notification_trigger_clients_ht, | |
667 | &list->notification_trigger_clients_ht_node); | |
668 | rcu_read_unlock(); | |
669 | list->notification_trigger_clients_ht = NULL; | |
670 | } | |
671 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
672 | &list->list, node) { | |
673 | free(client_list_element); | |
674 | } | |
675 | pthread_mutex_destroy(&list->lock); | |
676 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
677 | } | |
678 | ||
679 | static | |
680 | struct notification_client_list *notification_client_list_create( | |
681 | const struct lttng_trigger *trigger) | |
682 | { | |
683 | struct notification_client_list *client_list = | |
684 | zmalloc(sizeof(*client_list)); | |
685 | ||
686 | if (!client_list) { | |
687 | goto error; | |
688 | } | |
689 | pthread_mutex_init(&client_list->lock, NULL); | |
690 | urcu_ref_init(&client_list->ref); | |
691 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
692 | CDS_INIT_LIST_HEAD(&client_list->list); | |
693 | client_list->trigger = trigger; | |
694 | error: | |
695 | return client_list; | |
696 | } | |
697 | ||
698 | static | |
699 | void publish_notification_client_list( | |
700 | struct notification_thread_state *state, | |
701 | struct notification_client_list *list) | |
702 | { | |
703 | const struct lttng_condition *condition = | |
704 | lttng_trigger_get_const_condition(list->trigger); | |
705 | ||
706 | assert(!list->notification_trigger_clients_ht); | |
f2b3ef9f | 707 | notification_client_list_get(list); |
505b2d90 JG |
708 | |
709 | list->notification_trigger_clients_ht = | |
710 | state->notification_trigger_clients_ht; | |
711 | ||
712 | rcu_read_lock(); | |
713 | cds_lfht_add(state->notification_trigger_clients_ht, | |
714 | lttng_condition_hash(condition), | |
715 | &list->notification_trigger_clients_ht_node); | |
716 | rcu_read_unlock(); | |
717 | } | |
718 | ||
f2b3ef9f | 719 | LTTNG_HIDDEN |
505b2d90 JG |
720 | void notification_client_list_put(struct notification_client_list *list) |
721 | { | |
722 | if (!list) { | |
723 | return; | |
724 | } | |
725 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
726 | } | |
727 | ||
728 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
729 | static |
730 | struct notification_client_list *get_client_list_from_condition( | |
731 | struct notification_thread_state *state, | |
732 | const struct lttng_condition *condition) | |
733 | { | |
734 | struct cds_lfht_node *node; | |
735 | struct cds_lfht_iter iter; | |
505b2d90 | 736 | struct notification_client_list *list = NULL; |
ed327204 | 737 | |
505b2d90 | 738 | rcu_read_lock(); |
ed327204 JG |
739 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
740 | lttng_condition_hash(condition), | |
741 | match_client_list_condition, | |
742 | condition, | |
743 | &iter); | |
744 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
745 | if (node) { |
746 | list = container_of(node, struct notification_client_list, | |
747 | notification_trigger_clients_ht_node); | |
748 | list = notification_client_list_get(list) ? list : NULL; | |
749 | } | |
ed327204 | 750 | |
505b2d90 JG |
751 | rcu_read_unlock(); |
752 | return list; | |
ed327204 JG |
753 | } |
754 | ||
e4db5ace | 755 | static |
f82f93a1 JG |
756 | int evaluate_channel_condition_for_client( |
757 | const struct lttng_condition *condition, | |
758 | struct notification_thread_state *state, | |
759 | struct lttng_evaluation **evaluation, | |
760 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
761 | { |
762 | int ret; | |
763 | struct cds_lfht_iter iter; | |
764 | struct cds_lfht_node *node; | |
765 | struct channel_info *channel_info = NULL; | |
766 | struct channel_key *channel_key = NULL; | |
767 | struct channel_state_sample *last_sample = NULL; | |
768 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 769 | |
505b2d90 JG |
770 | rcu_read_lock(); |
771 | ||
f82f93a1 | 772 | /* Find the channel associated with the condition. */ |
e4db5ace | 773 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 774 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
775 | struct lttng_trigger_list_element *element; |
776 | ||
777 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 778 | const struct lttng_condition *current_condition = |
f82f93a1 | 779 | lttng_trigger_get_const_condition( |
e4db5ace JR |
780 | element->trigger); |
781 | ||
782 | assert(current_condition); | |
783 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 784 | current_condition)) { |
e4db5ace JR |
785 | continue; |
786 | } | |
787 | ||
788 | /* Found the trigger, save the channel key. */ | |
789 | channel_key = &channel_trigger_list->channel_key; | |
790 | break; | |
791 | } | |
792 | if (channel_key) { | |
793 | /* The channel key was found stop iteration. */ | |
794 | break; | |
795 | } | |
796 | } | |
797 | ||
798 | if (!channel_key){ | |
799 | /* No channel found; normal exit. */ | |
f82f93a1 | 800 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
801 | ret = 0; |
802 | goto end; | |
803 | } | |
804 | ||
805 | /* Fetch channel info for the matching channel. */ | |
806 | cds_lfht_lookup(state->channels_ht, | |
807 | hash_channel_key(channel_key), | |
808 | match_channel_info, | |
809 | channel_key, | |
810 | &iter); | |
811 | node = cds_lfht_iter_get_node(&iter); | |
812 | assert(node); | |
813 | channel_info = caa_container_of(node, struct channel_info, | |
814 | channels_ht_node); | |
815 | ||
816 | /* Retrieve the channel's last sample, if it exists. */ | |
817 | cds_lfht_lookup(state->channel_state_ht, | |
818 | hash_channel_key(channel_key), | |
819 | match_channel_state_sample, | |
820 | channel_key, | |
821 | &iter); | |
822 | node = cds_lfht_iter_get_node(&iter); | |
823 | if (node) { | |
824 | last_sample = caa_container_of(node, | |
825 | struct channel_state_sample, | |
826 | channel_state_ht_node); | |
827 | } else { | |
828 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
829 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
830 | ret = 0; | |
831 | goto end; | |
832 | } | |
833 | ||
f82f93a1 | 834 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
835 | NULL, last_sample, |
836 | 0, channel_info->session_info->consumed_data_size, | |
837 | channel_info); | |
e4db5ace | 838 | if (ret) { |
066a3c82 | 839 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
840 | goto end; |
841 | } | |
842 | ||
f82f93a1 JG |
843 | *session_uid = channel_info->session_info->uid; |
844 | *session_gid = channel_info->session_info->gid; | |
845 | end: | |
505b2d90 | 846 | rcu_read_unlock(); |
f82f93a1 JG |
847 | return ret; |
848 | } | |
849 | ||
850 | static | |
851 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
852 | { | |
853 | const char *session_name = NULL; | |
854 | enum lttng_condition_status status; | |
855 | ||
856 | switch (lttng_condition_get_type(condition)) { | |
857 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
858 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
859 | status = lttng_condition_buffer_usage_get_session_name( | |
860 | condition, &session_name); | |
861 | break; | |
862 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
863 | status = lttng_condition_session_consumed_size_get_session_name( | |
864 | condition, &session_name); | |
865 | break; | |
866 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
867 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
868 | status = lttng_condition_session_rotation_get_session_name( | |
869 | condition, &session_name); | |
870 | break; | |
871 | default: | |
872 | abort(); | |
873 | } | |
874 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
875 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
876 | goto end; | |
877 | } | |
878 | end: | |
879 | return session_name; | |
880 | } | |
881 | ||
f82f93a1 JG |
882 | static |
883 | int evaluate_session_condition_for_client( | |
884 | const struct lttng_condition *condition, | |
885 | struct notification_thread_state *state, | |
886 | struct lttng_evaluation **evaluation, | |
887 | uid_t *session_uid, gid_t *session_gid) | |
888 | { | |
889 | int ret; | |
890 | struct cds_lfht_iter iter; | |
891 | struct cds_lfht_node *node; | |
892 | const char *session_name; | |
893 | struct session_info *session_info = NULL; | |
894 | ||
505b2d90 | 895 | rcu_read_lock(); |
f82f93a1 JG |
896 | session_name = get_condition_session_name(condition); |
897 | ||
898 | /* Find the session associated with the trigger. */ | |
899 | cds_lfht_lookup(state->sessions_ht, | |
900 | hash_key_str(session_name, lttng_ht_seed), | |
901 | match_session, | |
902 | session_name, | |
903 | &iter); | |
904 | node = cds_lfht_iter_get_node(&iter); | |
905 | if (!node) { | |
906 | DBG("[notification-thread] No known session matching name \"%s\"", | |
907 | session_name); | |
908 | ret = 0; | |
909 | goto end; | |
910 | } | |
911 | ||
912 | session_info = caa_container_of(node, struct session_info, | |
913 | sessions_ht_node); | |
914 | session_info_get(session_info); | |
915 | ||
916 | /* | |
917 | * Evaluation is performed in-line here since only one type of | |
918 | * session-bound condition is handled for the moment. | |
919 | */ | |
920 | switch (lttng_condition_get_type(condition)) { | |
921 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
922 | if (!session_info->rotation.ongoing) { | |
be558f88 | 923 | ret = 0; |
f82f93a1 JG |
924 | goto end_session_put; |
925 | } | |
926 | ||
927 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
928 | session_info->rotation.id); | |
929 | if (!*evaluation) { | |
930 | /* Fatal error. */ | |
931 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
932 | session_info->name); | |
933 | ret = -1; | |
934 | goto end_session_put; | |
935 | } | |
936 | ret = 0; | |
937 | break; | |
938 | default: | |
939 | ret = 0; | |
940 | goto end_session_put; | |
941 | } | |
942 | ||
943 | *session_uid = session_info->uid; | |
944 | *session_gid = session_info->gid; | |
945 | ||
946 | end_session_put: | |
947 | session_info_put(session_info); | |
948 | end: | |
505b2d90 | 949 | rcu_read_unlock(); |
f82f93a1 JG |
950 | return ret; |
951 | } | |
952 | ||
f82f93a1 JG |
953 | static |
954 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
955 | const struct lttng_condition *condition, | |
956 | struct notification_client *client, | |
957 | struct notification_thread_state *state) | |
958 | { | |
959 | int ret; | |
960 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
961 | struct notification_client_list client_list = { |
962 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
963 | }; | |
f82f93a1 JG |
964 | struct notification_client_list_element client_list_element = { 0 }; |
965 | uid_t object_uid = 0; | |
966 | gid_t object_gid = 0; | |
967 | ||
968 | assert(trigger); | |
969 | assert(condition); | |
970 | assert(client); | |
971 | assert(state); | |
972 | ||
973 | switch (get_condition_binding_object(condition)) { | |
974 | case LTTNG_OBJECT_TYPE_SESSION: | |
975 | ret = evaluate_session_condition_for_client(condition, state, | |
976 | &evaluation, &object_uid, &object_gid); | |
977 | break; | |
978 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
979 | ret = evaluate_channel_condition_for_client(condition, state, | |
980 | &evaluation, &object_uid, &object_gid); | |
981 | break; | |
982 | case LTTNG_OBJECT_TYPE_NONE: | |
7e802d0a | 983 | DBG("[notification-thread] Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
984 | ret = 0; |
985 | goto end; | |
986 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
987 | default: | |
988 | ret = -1; | |
989 | goto end; | |
990 | } | |
af0c318d JG |
991 | if (ret) { |
992 | /* Fatal error. */ | |
993 | goto end; | |
994 | } | |
e4db5ace JR |
995 | if (!evaluation) { |
996 | /* Evaluation yielded nothing. Normal exit. */ | |
997 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
998 | ret = 0; | |
999 | goto end; | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * Create a temporary client list with the client currently | |
1004 | * subscribing. | |
1005 | */ | |
505b2d90 | 1006 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
e4db5ace JR |
1007 | CDS_INIT_LIST_HEAD(&client_list.list); |
1008 | client_list.trigger = trigger; | |
1009 | ||
1010 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1011 | client_list_element.client = client; | |
1012 | cds_list_add(&client_list_element.node, &client_list.list); | |
1013 | ||
1014 | /* Send evaluation result to the newly-subscribed client. */ | |
1015 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
1016 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 1017 | state, object_uid, object_gid); |
e4db5ace JR |
1018 | |
1019 | end: | |
1020 | return ret; | |
1021 | } | |
1022 | ||
ab0ee2ca JG |
1023 | static |
1024 | int notification_thread_client_subscribe(struct notification_client *client, | |
1025 | struct lttng_condition *condition, | |
1026 | struct notification_thread_state *state, | |
1027 | enum lttng_notification_channel_status *_status) | |
1028 | { | |
1029 | int ret = 0; | |
505b2d90 | 1030 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1031 | struct lttng_condition_list_element *condition_list_element = NULL; |
1032 | struct notification_client_list_element *client_list_element = NULL; | |
1033 | enum lttng_notification_channel_status status = | |
1034 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1035 | ||
1036 | /* | |
1037 | * Ensure that the client has not already subscribed to this condition | |
1038 | * before. | |
1039 | */ | |
1040 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1041 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1042 | condition)) { | |
1043 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1044 | goto end; | |
1045 | } | |
1046 | } | |
1047 | ||
1048 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1049 | if (!condition_list_element) { | |
1050 | ret = -1; | |
1051 | goto error; | |
1052 | } | |
1053 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1054 | if (!client_list_element) { | |
1055 | ret = -1; | |
1056 | goto error; | |
1057 | } | |
1058 | ||
ab0ee2ca JG |
1059 | /* |
1060 | * Add the newly-subscribed condition to the client's subscription list. | |
1061 | */ | |
1062 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1063 | condition_list_element->condition = condition; | |
1064 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
1065 | ||
ed327204 JG |
1066 | client_list = get_client_list_from_condition(state, condition); |
1067 | if (!client_list) { | |
2ae99f0b JG |
1068 | /* |
1069 | * No notification-emiting trigger registered with this | |
1070 | * condition. We don't evaluate the condition right away | |
1071 | * since this trigger is not registered yet. | |
1072 | */ | |
4fb43b68 | 1073 | free(client_list_element); |
505b2d90 | 1074 | goto end; |
ab0ee2ca JG |
1075 | } |
1076 | ||
2ae99f0b JG |
1077 | /* |
1078 | * The condition to which the client just subscribed is evaluated | |
1079 | * at this point so that conditions that are already TRUE result | |
1080 | * in a notification being sent out. | |
505b2d90 JG |
1081 | * |
1082 | * The client_list's trigger is used without locking the list itself. | |
1083 | * This is correct since the list doesn't own the trigger and the | |
1084 | * object is immutable. | |
2ae99f0b | 1085 | */ |
e4db5ace JR |
1086 | if (evaluate_condition_for_client(client_list->trigger, condition, |
1087 | client, state)) { | |
1088 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1089 | ret = -1; | |
4bd5b4af | 1090 | free(client_list_element); |
505b2d90 | 1091 | goto end; |
e4db5ace JR |
1092 | } |
1093 | ||
1094 | /* | |
1095 | * Add the client to the list of clients interested in a given trigger | |
1096 | * if a "notification" trigger with a corresponding condition was | |
1097 | * added prior. | |
1098 | */ | |
ab0ee2ca JG |
1099 | client_list_element->client = client; |
1100 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1101 | |
1102 | pthread_mutex_lock(&client_list->lock); | |
ab0ee2ca | 1103 | cds_list_add(&client_list_element->node, &client_list->list); |
505b2d90 | 1104 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1105 | end: |
1106 | if (_status) { | |
1107 | *_status = status; | |
1108 | } | |
505b2d90 JG |
1109 | if (client_list) { |
1110 | notification_client_list_put(client_list); | |
1111 | } | |
ab0ee2ca JG |
1112 | return ret; |
1113 | error: | |
1114 | free(condition_list_element); | |
1115 | free(client_list_element); | |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | static | |
1120 | int notification_thread_client_unsubscribe( | |
1121 | struct notification_client *client, | |
1122 | struct lttng_condition *condition, | |
1123 | struct notification_thread_state *state, | |
1124 | enum lttng_notification_channel_status *_status) | |
1125 | { | |
ab0ee2ca JG |
1126 | struct notification_client_list *client_list; |
1127 | struct lttng_condition_list_element *condition_list_element, | |
1128 | *condition_tmp; | |
1129 | struct notification_client_list_element *client_list_element, | |
1130 | *client_tmp; | |
1131 | bool condition_found = false; | |
1132 | enum lttng_notification_channel_status status = | |
1133 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1134 | ||
1135 | /* Remove the condition from the client's condition list. */ | |
1136 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1137 | &client->condition_list, node) { | |
1138 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1139 | condition)) { | |
1140 | continue; | |
1141 | } | |
1142 | ||
1143 | cds_list_del(&condition_list_element->node); | |
1144 | /* | |
1145 | * The caller may be iterating on the client's conditions to | |
1146 | * tear down a client's connection. In this case, the condition | |
1147 | * will be destroyed at the end. | |
1148 | */ | |
1149 | if (condition != condition_list_element->condition) { | |
1150 | lttng_condition_destroy( | |
1151 | condition_list_element->condition); | |
1152 | } | |
1153 | free(condition_list_element); | |
1154 | condition_found = true; | |
1155 | break; | |
1156 | } | |
1157 | ||
1158 | if (!condition_found) { | |
1159 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1160 | goto end; | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Remove the client from the list of clients interested the trigger | |
1165 | * matching the condition. | |
1166 | */ | |
ed327204 JG |
1167 | client_list = get_client_list_from_condition(state, condition); |
1168 | if (!client_list) { | |
505b2d90 | 1169 | goto end; |
ab0ee2ca JG |
1170 | } |
1171 | ||
505b2d90 | 1172 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
1173 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
1174 | &client_list->list, node) { | |
505b2d90 | 1175 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1176 | continue; |
1177 | } | |
1178 | cds_list_del(&client_list_element->node); | |
1179 | free(client_list_element); | |
1180 | break; | |
1181 | } | |
505b2d90 JG |
1182 | pthread_mutex_unlock(&client_list->lock); |
1183 | notification_client_list_put(client_list); | |
1184 | client_list = NULL; | |
ab0ee2ca JG |
1185 | end: |
1186 | lttng_condition_destroy(condition); | |
1187 | if (_status) { | |
1188 | *_status = status; | |
1189 | } | |
1190 | return 0; | |
1191 | } | |
1192 | ||
83b934ad MD |
1193 | static |
1194 | void free_notification_client_rcu(struct rcu_head *node) | |
1195 | { | |
1196 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1197 | } | |
1198 | ||
ab0ee2ca JG |
1199 | static |
1200 | void notification_client_destroy(struct notification_client *client, | |
1201 | struct notification_thread_state *state) | |
1202 | { | |
ab0ee2ca JG |
1203 | if (!client) { |
1204 | return; | |
1205 | } | |
1206 | ||
505b2d90 JG |
1207 | /* |
1208 | * The client object is not reachable by other threads, no need to lock | |
1209 | * the client here. | |
1210 | */ | |
ab0ee2ca JG |
1211 | if (client->socket >= 0) { |
1212 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1213 | client->socket = -1; |
ab0ee2ca | 1214 | } |
505b2d90 | 1215 | client->communication.active = false; |
882093ee JR |
1216 | lttng_payload_reset(&client->communication.inbound.payload); |
1217 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1218 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1219 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1220 | } |
1221 | ||
1222 | /* | |
1223 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1224 | * client pointer). | |
1225 | */ | |
1226 | static | |
1227 | struct notification_client *get_client_from_socket(int socket, | |
1228 | struct notification_thread_state *state) | |
1229 | { | |
1230 | struct cds_lfht_iter iter; | |
1231 | struct cds_lfht_node *node; | |
1232 | struct notification_client *client = NULL; | |
1233 | ||
1234 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1235 | hash_client_socket(socket), |
1236 | match_client_socket, | |
ab0ee2ca JG |
1237 | (void *) (unsigned long) socket, |
1238 | &iter); | |
1239 | node = cds_lfht_iter_get_node(&iter); | |
1240 | if (!node) { | |
1241 | goto end; | |
1242 | } | |
1243 | ||
1244 | client = caa_container_of(node, struct notification_client, | |
1245 | client_socket_ht_node); | |
1246 | end: | |
1247 | return client; | |
1248 | } | |
1249 | ||
f2b3ef9f JG |
1250 | /* |
1251 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1252 | * client pointer). | |
1253 | */ | |
1254 | static | |
1255 | struct notification_client *get_client_from_id(notification_client_id id, | |
1256 | struct notification_thread_state *state) | |
1257 | { | |
1258 | struct cds_lfht_iter iter; | |
1259 | struct cds_lfht_node *node; | |
1260 | struct notification_client *client = NULL; | |
1261 | ||
1262 | cds_lfht_lookup(state->client_id_ht, | |
1263 | hash_client_id(id), | |
1264 | match_client_id, | |
1265 | &id, | |
1266 | &iter); | |
1267 | node = cds_lfht_iter_get_node(&iter); | |
1268 | if (!node) { | |
1269 | goto end; | |
1270 | } | |
1271 | ||
1272 | client = caa_container_of(node, struct notification_client, | |
1273 | client_id_ht_node); | |
1274 | end: | |
1275 | return client; | |
1276 | } | |
1277 | ||
ab0ee2ca | 1278 | static |
e8360425 | 1279 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1280 | const struct lttng_condition *condition, |
1281 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1282 | { |
1283 | enum lttng_condition_status status; | |
e8360425 JD |
1284 | enum lttng_domain_type condition_domain; |
1285 | const char *condition_session_name = NULL; | |
1286 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1287 | |
e8360425 JD |
1288 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1289 | &condition_domain); | |
1290 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1291 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1292 | goto fail; |
1293 | } | |
1294 | ||
e8360425 JD |
1295 | status = lttng_condition_buffer_usage_get_session_name( |
1296 | condition, &condition_session_name); | |
1297 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1298 | ||
1299 | status = lttng_condition_buffer_usage_get_channel_name( | |
1300 | condition, &condition_channel_name); | |
1301 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1302 | ||
1303 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1304 | goto fail; | |
1305 | } | |
1306 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1307 | goto fail; |
1308 | } | |
1309 | ||
e8360425 JD |
1310 | return true; |
1311 | fail: | |
1312 | return false; | |
1313 | } | |
1314 | ||
1315 | static | |
1316 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1317 | const struct lttng_condition *condition, |
1318 | const struct channel_info *channel_info) | |
e8360425 JD |
1319 | { |
1320 | enum lttng_condition_status status; | |
1321 | const char *condition_session_name = NULL; | |
1322 | ||
1323 | status = lttng_condition_session_consumed_size_get_session_name( | |
1324 | condition, &condition_session_name); | |
1325 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1326 | ||
1327 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1328 | goto fail; |
1329 | } | |
1330 | ||
e8360425 JD |
1331 | return true; |
1332 | fail: | |
1333 | return false; | |
1334 | } | |
ab0ee2ca | 1335 | |
51eab943 JG |
1336 | static |
1337 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1338 | const struct channel_info *channel_info) | |
1339 | { | |
1340 | const struct lttng_condition *condition; | |
e8360425 | 1341 | bool trigger_applies; |
ab0ee2ca | 1342 | |
51eab943 | 1343 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1344 | if (!condition) { |
ab0ee2ca JG |
1345 | goto fail; |
1346 | } | |
e8360425 JD |
1347 | |
1348 | switch (lttng_condition_get_type(condition)) { | |
1349 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1350 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1351 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1352 | condition, channel_info); | |
1353 | break; | |
1354 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1355 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1356 | condition, channel_info); | |
1357 | break; | |
1358 | default: | |
ab0ee2ca JG |
1359 | goto fail; |
1360 | } | |
1361 | ||
e8360425 | 1362 | return trigger_applies; |
ab0ee2ca JG |
1363 | fail: |
1364 | return false; | |
1365 | } | |
1366 | ||
1367 | static | |
1368 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1369 | struct notification_client *client) | |
1370 | { | |
1371 | bool applies = false; | |
1372 | struct lttng_condition_list_element *condition_list_element; | |
1373 | ||
1374 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1375 | node) { | |
1376 | applies = lttng_condition_is_equal( | |
1377 | condition_list_element->condition, | |
1378 | lttng_trigger_get_condition(trigger)); | |
1379 | if (applies) { | |
1380 | break; | |
1381 | } | |
1382 | } | |
1383 | return applies; | |
1384 | } | |
1385 | ||
ed327204 JG |
1386 | /* Must be called with RCU read lock held. */ |
1387 | static | |
1388 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1389 | struct notification_thread_state *state, | |
1390 | const char *session_name) | |
1391 | { | |
1392 | struct lttng_session_trigger_list *list = NULL; | |
1393 | struct cds_lfht_node *node; | |
1394 | struct cds_lfht_iter iter; | |
1395 | ||
1396 | cds_lfht_lookup(state->session_triggers_ht, | |
1397 | hash_key_str(session_name, lttng_ht_seed), | |
1398 | match_session_trigger_list, | |
1399 | session_name, | |
1400 | &iter); | |
1401 | node = cds_lfht_iter_get_node(&iter); | |
1402 | if (!node) { | |
1403 | /* | |
1404 | * Not an error, the list of triggers applying to that session | |
1405 | * will be initialized when the session is created. | |
1406 | */ | |
1407 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1408 | session_name); | |
1409 | goto end; | |
1410 | } | |
1411 | ||
e742b055 | 1412 | list = caa_container_of(node, |
ed327204 JG |
1413 | struct lttng_session_trigger_list, |
1414 | session_triggers_ht_node); | |
1415 | end: | |
1416 | return list; | |
1417 | } | |
1418 | ||
ea9a44f0 JG |
1419 | /* |
1420 | * Allocate an empty lttng_session_trigger_list for the session named | |
1421 | * 'session_name'. | |
1422 | * | |
1423 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1424 | * It is the caller's responsability to ensure the session name is alive | |
1425 | * for as long as this list is. | |
1426 | */ | |
1427 | static | |
1428 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1429 | const char *session_name, | |
1430 | struct cds_lfht *session_triggers_ht) | |
1431 | { | |
1432 | struct lttng_session_trigger_list *list; | |
1433 | ||
1434 | list = zmalloc(sizeof(*list)); | |
1435 | if (!list) { | |
1436 | goto end; | |
1437 | } | |
1438 | list->session_name = session_name; | |
1439 | CDS_INIT_LIST_HEAD(&list->list); | |
1440 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1441 | list->session_triggers_ht = session_triggers_ht; | |
1442 | ||
1443 | rcu_read_lock(); | |
1444 | /* Publish the list through the session_triggers_ht. */ | |
1445 | cds_lfht_add(session_triggers_ht, | |
1446 | hash_key_str(session_name, lttng_ht_seed), | |
1447 | &list->session_triggers_ht_node); | |
1448 | rcu_read_unlock(); | |
1449 | end: | |
1450 | return list; | |
1451 | } | |
1452 | ||
1453 | static | |
1454 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1455 | { | |
1456 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1457 | rcu_node)); | |
1458 | } | |
1459 | ||
1460 | static | |
1461 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1462 | { | |
1463 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1464 | ||
1465 | /* Empty the list element by element, and then free the list itself. */ | |
1466 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1467 | &list->list, node) { | |
1468 | cds_list_del(&trigger_list_element->node); | |
1469 | free(trigger_list_element); | |
1470 | } | |
1471 | rcu_read_lock(); | |
1472 | /* Unpublish the list from the session_triggers_ht. */ | |
1473 | cds_lfht_del(list->session_triggers_ht, | |
1474 | &list->session_triggers_ht_node); | |
1475 | rcu_read_unlock(); | |
1476 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1477 | } | |
1478 | ||
1479 | static | |
1480 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1481 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1482 | { |
1483 | int ret = 0; | |
1484 | struct lttng_trigger_list_element *new_element = | |
1485 | zmalloc(sizeof(*new_element)); | |
1486 | ||
1487 | if (!new_element) { | |
1488 | ret = -1; | |
1489 | goto end; | |
1490 | } | |
1491 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1492 | new_element->trigger = trigger; | |
1493 | cds_list_add(&new_element->node, &list->list); | |
1494 | end: | |
1495 | return ret; | |
1496 | } | |
1497 | ||
1498 | static | |
1499 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1500 | const char *session_name) | |
1501 | { | |
1502 | bool applies = false; | |
1503 | const struct lttng_condition *condition; | |
1504 | ||
1505 | condition = lttng_trigger_get_const_condition(trigger); | |
1506 | switch (lttng_condition_get_type(condition)) { | |
1507 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1508 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1509 | { | |
1510 | enum lttng_condition_status condition_status; | |
1511 | const char *condition_session_name; | |
1512 | ||
1513 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1514 | condition, &condition_session_name); | |
1515 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1516 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1517 | goto end; | |
1518 | } | |
1519 | ||
1520 | assert(condition_session_name); | |
1521 | applies = !strcmp(condition_session_name, session_name); | |
1522 | break; | |
1523 | } | |
1524 | default: | |
1525 | goto end; | |
1526 | } | |
1527 | end: | |
1528 | return applies; | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1533 | * all triggers that apply to the session named 'session_name'. | |
1534 | * | |
1535 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1536 | * It is the caller's responsability to ensure the session name is alive | |
1537 | * for as long as this list is. | |
1538 | */ | |
1539 | static | |
1540 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1541 | const struct notification_thread_state *state, | |
1542 | const char *session_name) | |
1543 | { | |
1544 | int trigger_count = 0; | |
1545 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1546 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1547 | struct cds_lfht_iter iter; | |
1548 | ||
1549 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1550 | state->session_triggers_ht); | |
1551 | ||
1552 | /* Add all triggers applying to the session named 'session_name'. */ | |
1553 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1554 | node) { | |
1555 | int ret; | |
1556 | ||
1557 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1558 | session_name)) { | |
1559 | continue; | |
1560 | } | |
1561 | ||
1562 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1563 | trigger_ht_element->trigger); | |
1564 | if (ret) { | |
1565 | goto error; | |
1566 | } | |
1567 | ||
1568 | trigger_count++; | |
1569 | } | |
1570 | ||
1571 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1572 | trigger_count); | |
1573 | return session_trigger_list; | |
1574 | error: | |
1575 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1576 | return NULL; | |
1577 | } | |
1578 | ||
8abe313a JG |
1579 | static |
1580 | struct session_info *find_or_create_session_info( | |
1581 | struct notification_thread_state *state, | |
1582 | const char *name, uid_t uid, gid_t gid) | |
1583 | { | |
1584 | struct session_info *session = NULL; | |
1585 | struct cds_lfht_node *node; | |
1586 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1587 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1588 | |
1589 | rcu_read_lock(); | |
1590 | cds_lfht_lookup(state->sessions_ht, | |
1591 | hash_key_str(name, lttng_ht_seed), | |
1592 | match_session, | |
1593 | name, | |
1594 | &iter); | |
1595 | node = cds_lfht_iter_get_node(&iter); | |
1596 | if (node) { | |
1597 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1598 | name, uid, gid); | |
1599 | session = caa_container_of(node, struct session_info, | |
1600 | sessions_ht_node); | |
1601 | assert(session->uid == uid); | |
1602 | assert(session->gid == gid); | |
1eee26c5 JG |
1603 | session_info_get(session); |
1604 | goto end; | |
ea9a44f0 JG |
1605 | } |
1606 | ||
1607 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1608 | if (!trigger_list) { | |
1609 | goto error; | |
8abe313a JG |
1610 | } |
1611 | ||
1eee26c5 JG |
1612 | session = session_info_create(name, uid, gid, trigger_list, |
1613 | state->sessions_ht); | |
8abe313a JG |
1614 | if (!session) { |
1615 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1616 | name, uid, gid); | |
b248644d | 1617 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1618 | goto error; |
8abe313a | 1619 | } |
ea9a44f0 | 1620 | trigger_list = NULL; |
577983cb JG |
1621 | |
1622 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1623 | &session->sessions_ht_node); |
1eee26c5 | 1624 | end: |
8abe313a JG |
1625 | rcu_read_unlock(); |
1626 | return session; | |
ea9a44f0 JG |
1627 | error: |
1628 | rcu_read_unlock(); | |
1629 | session_info_put(session); | |
1630 | return NULL; | |
8abe313a JG |
1631 | } |
1632 | ||
ab0ee2ca JG |
1633 | static |
1634 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1635 | struct notification_thread_state *state, |
1636 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1637 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1638 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1639 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1640 | { |
1641 | struct cds_list_head trigger_list; | |
8abe313a JG |
1642 | struct channel_info *new_channel_info = NULL; |
1643 | struct channel_key channel_key = { | |
1644 | .key = channel_key_int, | |
1645 | .domain = channel_domain, | |
1646 | }; | |
ab0ee2ca JG |
1647 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1648 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1649 | int trigger_count = 0; | |
1650 | struct cds_lfht_iter iter; | |
8abe313a | 1651 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1652 | |
1653 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a | 1654 | channel_name, session_name, channel_key_int, |
526200e4 | 1655 | lttng_domain_type_str(channel_domain)); |
ab0ee2ca JG |
1656 | |
1657 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1658 | ||
8abe313a JG |
1659 | session_info = find_or_create_session_info(state, session_name, |
1660 | session_uid, session_gid); | |
1661 | if (!session_info) { | |
a9577b76 | 1662 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1663 | goto error; |
1664 | } | |
1665 | ||
8abe313a JG |
1666 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1667 | channel_capacity, session_info); | |
1668 | if (!new_channel_info) { | |
1669 | goto error; | |
1670 | } | |
ab0ee2ca | 1671 | |
83b934ad | 1672 | rcu_read_lock(); |
ab0ee2ca JG |
1673 | /* Build a list of all triggers applying to the new channel. */ |
1674 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1675 | node) { | |
1676 | struct lttng_trigger_list_element *new_element; | |
1677 | ||
1678 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1679 | new_channel_info)) { |
ab0ee2ca JG |
1680 | continue; |
1681 | } | |
1682 | ||
1683 | new_element = zmalloc(sizeof(*new_element)); | |
1684 | if (!new_element) { | |
83b934ad | 1685 | rcu_read_unlock(); |
ab0ee2ca JG |
1686 | goto error; |
1687 | } | |
1688 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1689 | new_element->trigger = trigger_ht_element->trigger; | |
1690 | cds_list_add(&new_element->node, &trigger_list); | |
1691 | trigger_count++; | |
1692 | } | |
83b934ad | 1693 | rcu_read_unlock(); |
ab0ee2ca JG |
1694 | |
1695 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1696 | trigger_count); | |
1697 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1698 | if (!channel_trigger_list) { | |
1699 | goto error; | |
1700 | } | |
8abe313a | 1701 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1702 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1703 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1704 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1705 | ||
1706 | rcu_read_lock(); | |
1707 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1708 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1709 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1710 | &new_channel_info->channels_ht_node); |
1711 | /* | |
1712 | * Add the list of triggers associated with this channel to the | |
1713 | * channel_triggers_ht. | |
1714 | */ | |
1715 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1716 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1717 | &channel_trigger_list->channel_triggers_ht_node); |
1718 | rcu_read_unlock(); | |
1eee26c5 | 1719 | session_info_put(session_info); |
ab0ee2ca JG |
1720 | *cmd_result = LTTNG_OK; |
1721 | return 0; | |
1722 | error: | |
ab0ee2ca | 1723 | channel_info_destroy(new_channel_info); |
8abe313a | 1724 | session_info_put(session_info); |
ab0ee2ca JG |
1725 | return 1; |
1726 | } | |
1727 | ||
83b934ad MD |
1728 | static |
1729 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1730 | { | |
1731 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1732 | rcu_node)); | |
1733 | } | |
1734 | ||
1735 | static | |
1736 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1737 | { | |
1738 | free(caa_container_of(node, struct channel_state_sample, | |
1739 | rcu_node)); | |
1740 | } | |
1741 | ||
ab0ee2ca JG |
1742 | static |
1743 | int handle_notification_thread_command_remove_channel( | |
1744 | struct notification_thread_state *state, | |
1745 | uint64_t channel_key, enum lttng_domain_type domain, | |
1746 | enum lttng_error_code *cmd_result) | |
1747 | { | |
1748 | struct cds_lfht_node *node; | |
1749 | struct cds_lfht_iter iter; | |
1750 | struct lttng_channel_trigger_list *trigger_list; | |
1751 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1752 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1753 | struct channel_info *channel_info; | |
1754 | ||
1755 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
526200e4 | 1756 | channel_key, lttng_domain_type_str(domain)); |
ab0ee2ca JG |
1757 | |
1758 | rcu_read_lock(); | |
1759 | ||
1760 | cds_lfht_lookup(state->channel_triggers_ht, | |
1761 | hash_channel_key(&key), | |
1762 | match_channel_trigger_list, | |
1763 | &key, | |
1764 | &iter); | |
1765 | node = cds_lfht_iter_get_node(&iter); | |
1766 | /* | |
1767 | * There is a severe internal error if we are being asked to remove a | |
1768 | * channel that doesn't exist. | |
1769 | */ | |
1770 | if (!node) { | |
1771 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1772 | goto end; | |
1773 | } | |
1774 | ||
1775 | /* Free the list of triggers associated with this channel. */ | |
1776 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1777 | channel_triggers_ht_node); | |
1778 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1779 | &trigger_list->list, node) { | |
1780 | cds_list_del(&trigger_list_element->node); | |
1781 | free(trigger_list_element); | |
1782 | } | |
1783 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1784 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1785 | |
1786 | /* Free sampled channel state. */ | |
1787 | cds_lfht_lookup(state->channel_state_ht, | |
1788 | hash_channel_key(&key), | |
1789 | match_channel_state_sample, | |
1790 | &key, | |
1791 | &iter); | |
1792 | node = cds_lfht_iter_get_node(&iter); | |
1793 | /* | |
1794 | * This is expected to be NULL if the channel is destroyed before we | |
1795 | * received a sample. | |
1796 | */ | |
1797 | if (node) { | |
1798 | struct channel_state_sample *sample = caa_container_of(node, | |
1799 | struct channel_state_sample, | |
1800 | channel_state_ht_node); | |
1801 | ||
1802 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1803 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1804 | } |
1805 | ||
1806 | /* Remove the channel from the channels_ht and free it. */ | |
1807 | cds_lfht_lookup(state->channels_ht, | |
1808 | hash_channel_key(&key), | |
1809 | match_channel_info, | |
1810 | &key, | |
1811 | &iter); | |
1812 | node = cds_lfht_iter_get_node(&iter); | |
1813 | assert(node); | |
1814 | channel_info = caa_container_of(node, struct channel_info, | |
1815 | channels_ht_node); | |
1816 | cds_lfht_del(state->channels_ht, node); | |
1817 | channel_info_destroy(channel_info); | |
1818 | end: | |
1819 | rcu_read_unlock(); | |
1820 | *cmd_result = LTTNG_OK; | |
1821 | return 0; | |
1822 | } | |
1823 | ||
0ca52944 | 1824 | static |
ed327204 | 1825 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1826 | struct notification_thread_state *state, |
ed327204 JG |
1827 | enum notification_thread_command_type cmd_type, |
1828 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1829 | uint64_t trace_archive_chunk_id, | |
1830 | struct lttng_trace_archive_location *location, | |
1831 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1832 | { |
ed327204 JG |
1833 | int ret = 0; |
1834 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1835 | struct lttng_session_trigger_list *trigger_list; | |
1836 | struct lttng_trigger_list_element *trigger_list_element; | |
1837 | struct session_info *session_info; | |
f2b3ef9f | 1838 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1839 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1840 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1841 | }; |
0ca52944 | 1842 | |
ed327204 JG |
1843 | rcu_read_lock(); |
1844 | ||
1845 | session_info = find_or_create_session_info(state, session_name, | |
1846 | session_uid, session_gid); | |
1847 | if (!session_info) { | |
a9577b76 | 1848 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1849 | ret = -1; |
1850 | cmd_result = LTTNG_ERR_NOMEM; | |
1851 | goto end; | |
1852 | } | |
1853 | ||
1854 | session_info->rotation.ongoing = | |
1855 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1856 | session_info->rotation.id = trace_archive_chunk_id; | |
1857 | trigger_list = get_session_trigger_list(state, session_name); | |
1858 | if (!trigger_list) { | |
1859 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1860 | session_name); | |
1861 | goto end; | |
1862 | } | |
1863 | ||
1864 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1865 | node) { | |
1866 | const struct lttng_condition *condition; | |
f2b3ef9f | 1867 | struct lttng_trigger *trigger; |
ed327204 JG |
1868 | struct notification_client_list *client_list; |
1869 | struct lttng_evaluation *evaluation = NULL; | |
1870 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1871 | enum action_executor_status executor_status; |
ed327204 JG |
1872 | |
1873 | trigger = trigger_list_element->trigger; | |
1874 | condition = lttng_trigger_get_const_condition(trigger); | |
1875 | assert(condition); | |
1876 | condition_type = lttng_condition_get_type(condition); | |
1877 | ||
1878 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1879 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1880 | continue; | |
1881 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1882 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1883 | continue; | |
1884 | } | |
1885 | ||
ed327204 | 1886 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1887 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1888 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1889 | trace_archive_chunk_id); | |
1890 | } else { | |
1891 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1892 | trace_archive_chunk_id, location); | |
1893 | } | |
1894 | ||
1895 | if (!evaluation) { | |
1896 | /* Internal error */ | |
1897 | ret = -1; | |
1898 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1899 | goto put_list; |
ed327204 JG |
1900 | } |
1901 | ||
f2b3ef9f JG |
1902 | /* |
1903 | * Ownership of `evaluation` transferred to the action executor | |
1904 | * no matter the result. | |
1905 | */ | |
1906 | executor_status = action_executor_enqueue(state->executor, | |
1907 | trigger, evaluation, &session_creds, | |
1908 | client_list); | |
1909 | evaluation = NULL; | |
1910 | switch (executor_status) { | |
1911 | case ACTION_EXECUTOR_STATUS_OK: | |
1912 | break; | |
1913 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1914 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1915 | /* | |
1916 | * TODO Add trigger identification (name/id) when | |
1917 | * it is added to the API. | |
1918 | */ | |
1919 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1920 | ret = -1; | |
1921 | goto put_list; | |
1922 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1923 | /* | |
1924 | * TODO Add trigger identification (name/id) when | |
1925 | * it is added to the API. | |
1926 | * | |
1927 | * Not a fatal error. | |
1928 | */ | |
1929 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1930 | ret = 0; | |
1931 | goto put_list; | |
1932 | default: | |
1933 | abort(); | |
1934 | } | |
1935 | ||
505b2d90 JG |
1936 | put_list: |
1937 | notification_client_list_put(client_list); | |
ed327204 | 1938 | if (caa_unlikely(ret)) { |
505b2d90 | 1939 | break; |
ed327204 JG |
1940 | } |
1941 | } | |
1942 | end: | |
1943 | session_info_put(session_info); | |
1944 | *_cmd_result = cmd_result; | |
1945 | rcu_read_unlock(); | |
1946 | return ret; | |
0ca52944 JG |
1947 | } |
1948 | ||
d02d7404 JR |
1949 | static |
1950 | int handle_notification_thread_command_add_tracer_event_source( | |
1951 | struct notification_thread_state *state, | |
1952 | int tracer_event_source_fd, | |
1953 | enum lttng_domain_type domain_type, | |
1954 | enum lttng_error_code *_cmd_result) | |
1955 | { | |
1956 | int ret = 0; | |
1957 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1958 | struct notification_event_tracer_event_source_element *element = NULL; | |
1959 | ||
1960 | element = zmalloc(sizeof(*element)); | |
1961 | if (!element) { | |
1962 | cmd_result = LTTNG_ERR_NOMEM; | |
1963 | ret = -1; | |
1964 | goto end; | |
1965 | } | |
1966 | ||
d02d7404 JR |
1967 | element->fd = tracer_event_source_fd; |
1968 | element->domain = domain_type; | |
1969 | ||
1970 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
1971 | ||
1972 | DBG3("[notification-thread] Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1973 | tracer_event_source_fd, | |
1974 | lttng_domain_type_str(domain_type)); | |
1975 | ||
1976 | /* Adding the read side pipe to the event poll. */ | |
1977 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLIN | LPOLLERR); | |
1978 | if (ret < 0) { | |
1979 | ERR("[notification-thread] Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", | |
1980 | tracer_event_source_fd, | |
1981 | lttng_domain_type_str(element->domain)); | |
1982 | cds_list_del(&element->node); | |
1983 | free(element); | |
1984 | goto end; | |
1985 | } | |
1986 | ||
1987 | element->is_fd_in_poll_set = true; | |
1988 | ||
1989 | end: | |
1990 | *_cmd_result = cmd_result; | |
1991 | return ret; | |
1992 | } | |
1993 | ||
8b524060 FD |
1994 | static |
1995 | int drain_event_notifier_notification_pipe( | |
1996 | struct notification_thread_state *state, | |
1997 | int pipe, enum lttng_domain_type domain) | |
1998 | { | |
1999 | struct lttng_poll_event events = {0}; | |
2000 | int ret; | |
2001 | ||
2002 | ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC); | |
2003 | if (ret < 0) { | |
2004 | ERR("[notification-thread] Error creating lttng_poll_event"); | |
2005 | goto end; | |
2006 | } | |
2007 | ||
2008 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2009 | if (ret < 0) { | |
2010 | ERR("[notification-thread] Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", | |
2011 | pipe); | |
2012 | goto end; | |
2013 | } | |
2014 | ||
2015 | while (true) { | |
2016 | /* | |
2017 | * Continue to consume notifications as long as there are new | |
2018 | * ones coming in. The tracer has been asked to stop producing | |
2019 | * them. | |
2020 | * | |
2021 | * LPOLLIN is explicitly checked since LPOLLHUP is implicitly | |
2022 | * monitored (on Linux, at least) and will be returned when | |
2023 | * the pipe is closed but empty. | |
2024 | */ | |
2025 | ret = lttng_poll_wait_interruptible(&events, 0); | |
a17b133b | 2026 | if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) { |
8b524060 FD |
2027 | /* No more notification to be read on this pipe. */ |
2028 | ret = 0; | |
2029 | goto end; | |
2030 | } else if (ret < 0) { | |
2031 | PERROR("Failed on lttng_poll_wait_interruptible() call"); | |
2032 | ret = -1; | |
2033 | goto end; | |
2034 | } | |
2035 | ||
2036 | ret = handle_one_event_notifier_notification(state, pipe, domain); | |
2037 | if (ret) { | |
2038 | ERR("[notification-thread] Error consuming an event notifier notification from pipe: fd = %d", | |
2039 | pipe); | |
2040 | } | |
2041 | } | |
2042 | end: | |
2043 | lttng_poll_clean(&events); | |
2044 | return ret; | |
2045 | } | |
2046 | ||
d02d7404 JR |
2047 | static |
2048 | int handle_notification_thread_command_remove_tracer_event_source( | |
2049 | struct notification_thread_state *state, | |
2050 | int tracer_event_source_fd, | |
2051 | enum lttng_error_code *_cmd_result) | |
2052 | { | |
2053 | int ret = 0; | |
2fb5e9b7 | 2054 | bool found = false; |
d02d7404 JR |
2055 | enum lttng_error_code cmd_result = LTTNG_OK; |
2056 | struct notification_event_tracer_event_source_element *source_element = NULL, *tmp; | |
2057 | ||
2058 | cds_list_for_each_entry_safe(source_element, tmp, | |
2059 | &state->tracer_event_sources_list, node) { | |
2060 | if (source_element->fd != tracer_event_source_fd) { | |
2061 | continue; | |
2062 | } | |
2063 | ||
2064 | DBG("[notification-thread] Removed tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2065 | tracer_event_source_fd, | |
2066 | lttng_domain_type_str(source_element->domain)); | |
2067 | cds_list_del(&source_element->node); | |
2fb5e9b7 | 2068 | found = true; |
d02d7404 JR |
2069 | break; |
2070 | } | |
2071 | ||
2fb5e9b7 JG |
2072 | if (!found) { |
2073 | /* | |
2074 | * This is temporarily allowed since the poll activity set is | |
2075 | * not properly cleaned-up for the moment. This is adressed in | |
2076 | * an upcoming fix. | |
2077 | */ | |
2078 | source_element = NULL; | |
2079 | goto end; | |
2080 | } | |
d02d7404 JR |
2081 | |
2082 | if (!source_element->is_fd_in_poll_set) { | |
2083 | /* Skip the poll set removal. */ | |
2084 | goto end; | |
2085 | } | |
2086 | ||
2087 | DBG3("[notification-thread] Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2088 | tracer_event_source_fd, | |
2089 | lttng_domain_type_str(source_element->domain)); | |
2090 | ||
2091 | /* Removing the fd from the event poll set. */ | |
2092 | ret = lttng_poll_del(&state->events, tracer_event_source_fd); | |
2093 | if (ret < 0) { | |
2094 | ERR("[notification-thread] Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", | |
2095 | tracer_event_source_fd, | |
2096 | lttng_domain_type_str(source_element->domain)); | |
2097 | cmd_result = LTTNG_ERR_FATAL; | |
2098 | goto end; | |
2099 | } | |
2100 | ||
173900f6 JG |
2101 | source_element->is_fd_in_poll_set = false; |
2102 | ||
8b524060 FD |
2103 | ret = drain_event_notifier_notification_pipe(state, tracer_event_source_fd, |
2104 | source_element->domain); | |
2105 | if (ret) { | |
2106 | ERR("[notification-thread] Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", | |
2107 | tracer_event_source_fd, | |
2108 | lttng_domain_type_str(source_element->domain)); | |
2109 | cmd_result = LTTNG_ERR_FATAL; | |
2110 | goto end; | |
2111 | } | |
2112 | ||
2113 | /* | |
2114 | * The drain_event_notifier_notification_pipe() call might have read | |
2115 | * data from an fd that we received in event in the latest _poll_wait() | |
2116 | * call. Make sure the thread call poll_wait() again to ensure we have | |
2117 | * a clean state. | |
2118 | */ | |
2119 | state->restart_poll = true; | |
2120 | ||
d02d7404 JR |
2121 | end: |
2122 | free(source_element); | |
2123 | *_cmd_result = cmd_result; | |
2124 | return ret; | |
2125 | } | |
2126 | ||
90aa04a1 FD |
2127 | static |
2128 | int condition_on_event_update_error_count(struct lttng_trigger *trigger) | |
2129 | { | |
2130 | int ret = 0; | |
2131 | uint64_t error_count = 0; | |
2132 | struct lttng_condition *condition; | |
2133 | enum event_notifier_error_accounting_status status; | |
2134 | ||
2135 | condition = lttng_trigger_get_condition(trigger); | |
2136 | assert(lttng_condition_get_type(condition) == | |
2137 | LTTNG_CONDITION_TYPE_ON_EVENT); | |
2138 | ||
2139 | status = event_notifier_error_accounting_get_count(trigger, &error_count); | |
2140 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2141 | uid_t trigger_owner_uid; | |
2142 | const char *trigger_name; | |
2143 | const enum lttng_trigger_status trigger_status = | |
2144 | lttng_trigger_get_owner_uid( | |
2145 | trigger, &trigger_owner_uid); | |
2146 | ||
2147 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
2148 | if (lttng_trigger_get_name(trigger, &trigger_name) != LTTNG_TRIGGER_STATUS_OK) { | |
2149 | trigger_name = "(unnamed)"; | |
2150 | } | |
2151 | ||
2152 | ERR("Failed to get event notifier error count of trigger for update: trigger owner = %d, trigger name = '%s'", | |
2153 | trigger_owner_uid, trigger_name); | |
2154 | ret = -1; | |
2155 | } | |
2156 | ||
2157 | lttng_condition_on_event_set_error_count(condition, error_count); | |
2158 | return ret; | |
2159 | } | |
2160 | ||
d02d7404 JR |
2161 | int handle_notification_thread_remove_tracer_event_source_no_result( |
2162 | struct notification_thread_state *state, | |
2163 | int tracer_event_source_fd) | |
2164 | { | |
2165 | int ret; | |
2166 | enum lttng_error_code cmd_result; | |
2167 | ||
2168 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
2169 | state, tracer_event_source_fd, &cmd_result); | |
2170 | (void) cmd_result; | |
2171 | return ret; | |
2172 | } | |
2173 | ||
90aa04a1 FD |
2174 | static |
2175 | bool action_type_needs_tracer_notifier(enum lttng_action_type action_type) | |
2176 | { | |
2177 | switch (action_type) { | |
2178 | case LTTNG_ACTION_TYPE_NOTIFY: | |
2179 | case LTTNG_ACTION_TYPE_START_SESSION: | |
2180 | case LTTNG_ACTION_TYPE_STOP_SESSION: | |
2181 | case LTTNG_ACTION_TYPE_SNAPSHOT_SESSION: | |
2182 | case LTTNG_ACTION_TYPE_ROTATE_SESSION: | |
2183 | return true; | |
2184 | case LTTNG_ACTION_TYPE_GROUP: | |
2185 | case LTTNG_ACTION_TYPE_UNKNOWN: | |
2186 | default: | |
2187 | abort(); | |
2188 | } | |
2189 | } | |
2190 | ||
2191 | static | |
2192 | bool action_needs_tracer_notifier(const struct lttng_action *action) | |
2193 | { | |
2194 | bool needs_tracer_notifier = false; | |
2195 | unsigned int i, count; | |
2196 | enum lttng_action_status action_status; | |
2197 | enum lttng_action_type action_type; | |
2198 | ||
2199 | assert(action); | |
2200 | /* If there is only one action. Check if it needs a tracer notifier. */ | |
2201 | action_type = lttng_action_get_type(action); | |
2202 | if (action_type != LTTNG_ACTION_TYPE_GROUP) { | |
2203 | needs_tracer_notifier = action_type_needs_tracer_notifier( | |
2204 | action_type); | |
2205 | goto end; | |
2206 | } | |
2207 | ||
2208 | /* | |
2209 | * Iterate over all the actions of the action group and check if any of | |
2210 | * them needs a tracer notifier. | |
2211 | */ | |
2212 | action_status = lttng_action_group_get_count(action, &count); | |
2213 | assert(action_status == LTTNG_ACTION_STATUS_OK); | |
2214 | for (i = 0; i < count; i++) { | |
2215 | const struct lttng_action *inner_action = | |
2216 | lttng_action_group_get_at_index(action, i); | |
2217 | ||
2218 | action_type = lttng_action_get_type(inner_action); | |
2219 | if (action_type_needs_tracer_notifier(action_type)) { | |
2220 | needs_tracer_notifier = true; | |
2221 | goto end; | |
2222 | } | |
2223 | } | |
2224 | ||
2225 | end: | |
2226 | return needs_tracer_notifier; | |
2227 | } | |
2228 | ||
2229 | /* | |
2230 | * A given trigger needs a tracer notifier if | |
2231 | * it has an event-rule condition, | |
2232 | * AND | |
2233 | * it has one or more sessiond-execution action. | |
2234 | */ | |
2235 | static | |
2236 | bool trigger_needs_tracer_notifier(const struct lttng_trigger *trigger) | |
2237 | { | |
2238 | bool needs_tracer_notifier = false; | |
2239 | const struct lttng_condition *condition = | |
2240 | lttng_trigger_get_const_condition(trigger); | |
2241 | const struct lttng_action *action = | |
2242 | lttng_trigger_get_const_action(trigger); | |
2243 | ||
2244 | switch (lttng_condition_get_type(condition)) { | |
2245 | case LTTNG_CONDITION_TYPE_ON_EVENT: | |
2246 | needs_tracer_notifier = action_needs_tracer_notifier(action); | |
2247 | goto end; | |
2248 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
2249 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2250 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2251 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2252 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2253 | goto end; | |
2254 | case LTTNG_CONDITION_TYPE_UNKNOWN: | |
2255 | default: | |
2256 | abort(); | |
2257 | } | |
2258 | end: | |
2259 | return needs_tracer_notifier; | |
2260 | } | |
2261 | ||
fbc9f37d JR |
2262 | static int handle_notification_thread_command_list_triggers( |
2263 | struct notification_thread_handle *handle, | |
2264 | struct notification_thread_state *state, | |
2265 | uid_t client_uid, | |
2266 | struct lttng_triggers **triggers, | |
2267 | enum lttng_error_code *_cmd_result) | |
2268 | { | |
2269 | int ret = 0; | |
2270 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2271 | struct cds_lfht_iter iter; | |
2272 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2273 | struct lttng_triggers *local_triggers = NULL; | |
2274 | const struct lttng_credentials *creds; | |
2275 | ||
2276 | rcu_read_lock(); | |
2277 | ||
2278 | local_triggers = lttng_triggers_create(); | |
2279 | if (!local_triggers) { | |
2280 | /* Not a fatal error. */ | |
2281 | cmd_result = LTTNG_ERR_NOMEM; | |
2282 | goto end; | |
2283 | } | |
2284 | ||
2285 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2286 | trigger_ht_element, node) { | |
2287 | /* | |
2288 | * Only return the triggers to which the client has access. | |
2289 | * The root user has visibility over all triggers. | |
2290 | */ | |
2291 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2292 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2293 | continue; | |
2294 | } | |
2295 | ||
90aa04a1 FD |
2296 | if (trigger_needs_tracer_notifier(trigger_ht_element->trigger)) { |
2297 | ret = condition_on_event_update_error_count( | |
2298 | trigger_ht_element->trigger); | |
2299 | assert(!ret); | |
2300 | } | |
2301 | ||
fbc9f37d JR |
2302 | ret = lttng_triggers_add(local_triggers, |
2303 | trigger_ht_element->trigger); | |
2304 | if (ret < 0) { | |
2305 | /* Not a fatal error. */ | |
2306 | ret = 0; | |
2307 | cmd_result = LTTNG_ERR_NOMEM; | |
2308 | goto end; | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | /* Transferring ownership to the caller. */ | |
2313 | *triggers = local_triggers; | |
2314 | local_triggers = NULL; | |
2315 | ||
2316 | end: | |
2317 | rcu_read_unlock(); | |
2318 | lttng_triggers_destroy(local_triggers); | |
2319 | *_cmd_result = cmd_result; | |
2320 | return ret; | |
2321 | } | |
2322 | ||
1da26331 | 2323 | static |
959e3c66 | 2324 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2325 | { |
959e3c66 | 2326 | bool is_supported; |
1da26331 JG |
2327 | |
2328 | switch (lttng_condition_get_type(condition)) { | |
2329 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2330 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2331 | { | |
959e3c66 | 2332 | int ret; |
1da26331 JG |
2333 | enum lttng_domain_type domain; |
2334 | ||
2335 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2336 | &domain); | |
959e3c66 | 2337 | assert(ret == 0); |
1da26331 JG |
2338 | |
2339 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2340 | is_supported = true; |
1da26331 JG |
2341 | goto end; |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Older kernel tracers don't expose the API to monitor their | |
2346 | * buffers. Therefore, we reject triggers that require that | |
2347 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2348 | * |
2349 | * Assume unsupported on error. | |
1da26331 | 2350 | */ |
959e3c66 JR |
2351 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2352 | break; | |
2353 | } | |
d602bd6a | 2354 | case LTTNG_CONDITION_TYPE_ON_EVENT: |
959e3c66 JR |
2355 | { |
2356 | const struct lttng_event_rule *event_rule; | |
2357 | enum lttng_domain_type domain; | |
2358 | const enum lttng_condition_status status = | |
d602bd6a | 2359 | lttng_condition_on_event_get_rule( |
959e3c66 JR |
2360 | condition, &event_rule); |
2361 | ||
2362 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
2363 | ||
2364 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2365 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2366 | is_supported = true; | |
2367 | goto end; | |
2368 | } | |
2369 | ||
2370 | /* | |
2371 | * Older kernel tracers can't emit notification. Therefore, we | |
2372 | * reject triggers that require that mechanism to be available | |
2373 | * to be evaluated. | |
2374 | * | |
2375 | * Assume unsupported on error. | |
2376 | */ | |
2377 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2378 | break; |
2379 | } | |
2380 | default: | |
959e3c66 | 2381 | is_supported = true; |
1da26331 JG |
2382 | } |
2383 | end: | |
959e3c66 | 2384 | return is_supported; |
1da26331 JG |
2385 | } |
2386 | ||
51eab943 JG |
2387 | /* Must be called with RCU read lock held. */ |
2388 | static | |
f2b3ef9f | 2389 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2390 | struct notification_thread_state *state) |
2391 | { | |
2392 | int ret = 0; | |
51eab943 JG |
2393 | const struct lttng_condition *condition; |
2394 | const char *session_name; | |
2395 | struct lttng_session_trigger_list *trigger_list; | |
2396 | ||
2397 | condition = lttng_trigger_get_const_condition(trigger); | |
2398 | switch (lttng_condition_get_type(condition)) { | |
2399 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2400 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2401 | { | |
2402 | enum lttng_condition_status status; | |
2403 | ||
2404 | status = lttng_condition_session_rotation_get_session_name( | |
2405 | condition, &session_name); | |
2406 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
2407 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
2408 | ret = -1; | |
2409 | goto end; | |
2410 | } | |
2411 | break; | |
2412 | } | |
2413 | default: | |
2414 | ret = -1; | |
2415 | goto end; | |
2416 | } | |
2417 | ||
ed327204 JG |
2418 | trigger_list = get_session_trigger_list(state, session_name); |
2419 | if (!trigger_list) { | |
51eab943 JG |
2420 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
2421 | session_name); | |
2422 | goto end; | |
51eab943 | 2423 | |
ed327204 | 2424 | } |
51eab943 JG |
2425 | |
2426 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
2427 | session_name); | |
2428 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2429 | end: | |
2430 | return ret; | |
2431 | } | |
2432 | ||
2433 | /* Must be called with RCU read lock held. */ | |
2434 | static | |
f2b3ef9f | 2435 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2436 | struct notification_thread_state *state) |
2437 | { | |
2438 | int ret = 0; | |
2439 | struct cds_lfht_node *node; | |
2440 | struct cds_lfht_iter iter; | |
2441 | struct channel_info *channel; | |
2442 | ||
2443 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2444 | channels_ht_node) { | |
2445 | struct lttng_trigger_list_element *trigger_list_element; | |
2446 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2447 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2448 | |
2449 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2450 | continue; | |
2451 | } | |
2452 | ||
2453 | cds_lfht_lookup(state->channel_triggers_ht, | |
2454 | hash_channel_key(&channel->key), | |
2455 | match_channel_trigger_list, | |
2456 | &channel->key, | |
a5d64ae7 MD |
2457 | &lookup_iter); |
2458 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2459 | assert(node); |
2460 | trigger_list = caa_container_of(node, | |
2461 | struct lttng_channel_trigger_list, | |
2462 | channel_triggers_ht_node); | |
2463 | ||
2464 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2465 | if (!trigger_list_element) { | |
2466 | ret = -1; | |
2467 | goto end; | |
2468 | } | |
2469 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2470 | trigger_list_element->trigger = trigger; | |
2471 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2472 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2473 | channel->name); | |
2474 | } | |
2475 | end: | |
2476 | return ret; | |
2477 | } | |
2478 | ||
f2b3ef9f JG |
2479 | static |
2480 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2481 | { | |
2482 | bool is_notify = false; | |
2483 | unsigned int i, count; | |
2484 | enum lttng_action_status action_status; | |
2485 | const struct lttng_action *action = | |
2486 | lttng_trigger_get_const_action(trigger); | |
2487 | enum lttng_action_type action_type; | |
2488 | ||
2489 | assert(action); | |
17182cfd | 2490 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2491 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2492 | is_notify = true; | |
2493 | goto end; | |
2494 | } else if (action_type != LTTNG_ACTION_TYPE_GROUP) { | |
2495 | goto end; | |
2496 | } | |
2497 | ||
2498 | action_status = lttng_action_group_get_count(action, &count); | |
2499 | assert(action_status == LTTNG_ACTION_STATUS_OK); | |
2500 | ||
2501 | for (i = 0; i < count; i++) { | |
2502 | const struct lttng_action *inner_action = | |
2503 | lttng_action_group_get_at_index( | |
2504 | action, i); | |
2505 | ||
17182cfd | 2506 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2507 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2508 | is_notify = true; | |
2509 | goto end; | |
2510 | } | |
2511 | } | |
2512 | ||
2513 | end: | |
2514 | return is_notify; | |
2515 | } | |
2516 | ||
242388e4 JR |
2517 | static bool trigger_name_taken(struct notification_thread_state *state, |
2518 | const struct lttng_trigger *trigger) | |
2519 | { | |
2520 | struct cds_lfht_iter iter; | |
2521 | ||
2522 | /* | |
2523 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2524 | * The match is done against the trigger name and uid. | |
2525 | */ | |
2526 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2527 | hash_trigger_by_name_uid(trigger), | |
2528 | match_trigger_by_name_uid, | |
2529 | trigger, | |
2530 | &iter); | |
2531 | return !!cds_lfht_iter_get_node(&iter); | |
2532 | } | |
2533 | ||
2534 | static | |
2535 | enum lttng_error_code generate_trigger_name( | |
2536 | struct notification_thread_state *state, | |
2537 | struct lttng_trigger *trigger, const char **name) | |
2538 | { | |
2539 | enum lttng_error_code ret_code = LTTNG_OK; | |
2540 | bool taken = false; | |
2541 | enum lttng_trigger_status status; | |
2542 | ||
2543 | do { | |
2544 | const int ret = lttng_trigger_generate_name(trigger, | |
2545 | state->trigger_id.name_offset++); | |
2546 | if (ret) { | |
2547 | /* The only reason this can fail right now. */ | |
2548 | ret_code = LTTNG_ERR_NOMEM; | |
2549 | break; | |
2550 | } | |
2551 | ||
2552 | status = lttng_trigger_get_name(trigger, name); | |
2553 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
2554 | ||
2555 | taken = trigger_name_taken(state, trigger); | |
2556 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2557 | ||
2558 | return ret_code; | |
2559 | } | |
2560 | ||
ab0ee2ca | 2561 | /* |
f2b3ef9f | 2562 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2563 | * |
1da26331 | 2564 | * The effects of this are benign since: |
ab0ee2ca | 2565 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2566 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2567 | * - The notifications will not be sent since the client's credentials |
2568 | * are checked against the channel at that moment. | |
1da26331 JG |
2569 | * |
2570 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2571 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2572 | * |
2573 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2574 | * error code. | |
ab0ee2ca JG |
2575 | */ |
2576 | static | |
2577 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2578 | struct notification_thread_state *state, |
2579 | struct lttng_trigger *trigger, | |
2580 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
2581 | { |
2582 | int ret = 0; | |
2583 | struct lttng_condition *condition; | |
2584 | struct notification_client *client; | |
2585 | struct notification_client_list *client_list = NULL; | |
2586 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
f2b3ef9f | 2587 | struct notification_client_list_element *client_list_element; |
e7c93cf9 | 2588 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; |
ab0ee2ca JG |
2589 | struct cds_lfht_node *node; |
2590 | struct cds_lfht_iter iter; | |
242388e4 | 2591 | const char* trigger_name; |
ab0ee2ca | 2592 | bool free_trigger = true; |
f2b3ef9f JG |
2593 | struct lttng_evaluation *evaluation = NULL; |
2594 | struct lttng_credentials object_creds; | |
ff588497 JR |
2595 | uid_t object_uid; |
2596 | gid_t object_gid; | |
f2b3ef9f | 2597 | enum action_executor_status executor_status; |
e6887944 JR |
2598 | const uint64_t trigger_tracer_token = |
2599 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2600 | |
2601 | rcu_read_lock(); | |
2602 | ||
e6887944 JR |
2603 | /* Set the trigger's tracer token. */ |
2604 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2605 | ||
242388e4 JR |
2606 | if (lttng_trigger_get_name(trigger, &trigger_name) == |
2607 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2608 | const enum lttng_error_code ret_code = generate_trigger_name( | |
2609 | state, trigger, &trigger_name); | |
2610 | ||
2611 | if (ret_code != LTTNG_OK) { | |
2612 | /* Fatal error. */ | |
2613 | ret = -1; | |
2614 | *cmd_result = ret_code; | |
2615 | goto error; | |
2616 | } | |
2617 | } else if (trigger_name_taken(state, trigger)) { | |
2618 | /* Not a fatal error. */ | |
2619 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2620 | ret = 0; | |
2621 | goto error; | |
2622 | } | |
2623 | ||
ab0ee2ca | 2624 | condition = lttng_trigger_get_condition(trigger); |
1da26331 JG |
2625 | assert(condition); |
2626 | ||
959e3c66 JR |
2627 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2628 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2629 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2630 | goto error; | |
1da26331 JG |
2631 | } |
2632 | ||
ab0ee2ca JG |
2633 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2634 | if (!trigger_ht_element) { | |
2635 | ret = -1; | |
2636 | goto error; | |
2637 | } | |
2638 | ||
2639 | /* Add trigger to the trigger_ht. */ | |
2640 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2641 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2642 | trigger_ht_element->trigger = trigger; |
2643 | ||
2644 | node = cds_lfht_add_unique(state->triggers_ht, | |
2645 | lttng_condition_hash(condition), | |
242388e4 JR |
2646 | match_trigger, |
2647 | trigger, | |
ab0ee2ca JG |
2648 | &trigger_ht_element->node); |
2649 | if (node != &trigger_ht_element->node) { | |
2650 | /* Not a fatal error, simply report it to the client. */ | |
2651 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2652 | goto error_free_ht_element; | |
2653 | } | |
2654 | ||
242388e4 JR |
2655 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2656 | hash_trigger_by_name_uid(trigger), | |
2657 | match_trigger_by_name_uid, | |
2658 | trigger, | |
2659 | &trigger_ht_element->node_by_name_uid); | |
2660 | if (node != &trigger_ht_element->node_by_name_uid) { | |
2661 | /* Not a fatal error, simply report it to the client. */ | |
2662 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2663 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2664 | goto error_free_ht_element; | |
2665 | } | |
2666 | ||
d602bd6a | 2667 | if (lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT) { |
e7c93cf9 JR |
2668 | trigger_tokens_ht_element = zmalloc(sizeof(*trigger_tokens_ht_element)); |
2669 | if (!trigger_tokens_ht_element) { | |
2670 | /* Fatal error. */ | |
2671 | ret = -1; | |
2672 | cds_lfht_del(state->triggers_ht, | |
2673 | &trigger_ht_element->node); | |
2674 | cds_lfht_del(state->triggers_by_name_uid_ht, | |
2675 | &trigger_ht_element->node_by_name_uid); | |
2676 | goto error_free_ht_element; | |
2677 | } | |
2678 | ||
2679 | /* Add trigger token to the trigger_tokens_ht. */ | |
2680 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2681 | trigger_tokens_ht_element->token = | |
2682 | LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2683 | trigger_tokens_ht_element->trigger = trigger; | |
2684 | ||
2685 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2686 | hash_key_u64(&trigger_tokens_ht_element->token, | |
2687 | lttng_ht_seed), | |
2688 | match_trigger_token, | |
2689 | &trigger_tokens_ht_element->token, | |
2690 | &trigger_tokens_ht_element->node); | |
2691 | if (node != &trigger_tokens_ht_element->node) { | |
2692 | /* Internal corruption, fatal error. */ | |
2693 | ret = -1; | |
2694 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2695 | cds_lfht_del(state->triggers_ht, | |
2696 | &trigger_ht_element->node); | |
2697 | cds_lfht_del(state->triggers_by_name_uid_ht, | |
2698 | &trigger_ht_element->node_by_name_uid); | |
2699 | goto error_free_ht_element; | |
2700 | } | |
90aa04a1 FD |
2701 | |
2702 | if (trigger_needs_tracer_notifier(trigger)) { | |
2703 | uint64_t error_counter_index = 0; | |
2704 | enum event_notifier_error_accounting_status error_accounting_status; | |
2705 | ||
2706 | error_accounting_status = event_notifier_error_accounting_register_event_notifier( | |
2707 | trigger, &error_counter_index); | |
2708 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2709 | if (error_accounting_status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE) { | |
2710 | DBG("Event notifier group error accounting map is full"); | |
2711 | *cmd_result = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING_FULL; | |
2712 | } else { | |
2713 | ERR("Failed to register event notifier for error accounting"); | |
2714 | *cmd_result = LTTNG_ERR_EVENT_NOTIFIER_REGISTRATION; | |
2715 | } | |
2716 | ||
2717 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2718 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); | |
2719 | cds_lfht_del(state->trigger_tokens_ht, &trigger_tokens_ht_element->node); | |
2720 | goto error_free_ht_element; | |
2721 | } | |
2722 | ||
2723 | lttng_condition_on_event_set_error_counter_index( | |
2724 | condition, error_counter_index); | |
2725 | } | |
2726 | ||
e7c93cf9 JR |
2727 | } |
2728 | ||
ab0ee2ca JG |
2729 | /* |
2730 | * Ownership of the trigger and of its wrapper was transfered to | |
e7c93cf9 | 2731 | * the triggers_ht. Same for token ht element if necessary. |
ab0ee2ca | 2732 | */ |
e7c93cf9 | 2733 | trigger_tokens_ht_element = NULL; |
ab0ee2ca JG |
2734 | trigger_ht_element = NULL; |
2735 | free_trigger = false; | |
2736 | ||
2737 | /* | |
2738 | * The rest only applies to triggers that have a "notify" action. | |
2739 | * It is not skipped as this is the only action type currently | |
2740 | * supported. | |
2741 | */ | |
f2b3ef9f JG |
2742 | if (is_trigger_action_notify(trigger)) { |
2743 | client_list = notification_client_list_create(trigger); | |
2744 | if (!client_list) { | |
2745 | ret = -1; | |
2746 | goto error_free_ht_element; | |
ab0ee2ca JG |
2747 | } |
2748 | ||
f2b3ef9f JG |
2749 | /* Build a list of clients to which this new trigger applies. */ |
2750 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
2751 | client_socket_ht_node) { | |
2752 | if (!trigger_applies_to_client(trigger, client)) { | |
2753 | continue; | |
2754 | } | |
2755 | ||
2756 | client_list_element = | |
2757 | zmalloc(sizeof(*client_list_element)); | |
2758 | if (!client_list_element) { | |
2759 | ret = -1; | |
2760 | goto error_put_client_list; | |
2761 | } | |
2762 | ||
2763 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
2764 | client_list_element->client = client; | |
2765 | cds_list_add(&client_list_element->node, | |
2766 | &client_list->list); | |
ab0ee2ca | 2767 | } |
f2b3ef9f JG |
2768 | |
2769 | /* | |
2770 | * Client list ownership transferred to the | |
2771 | * notification_trigger_clients_ht. | |
2772 | */ | |
2773 | publish_notification_client_list(state, client_list); | |
ab0ee2ca JG |
2774 | } |
2775 | ||
f82f93a1 | 2776 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2777 | case LTTNG_OBJECT_TYPE_SESSION: |
2778 | /* Add the trigger to the list if it matches a known session. */ | |
2779 | ret = bind_trigger_to_matching_session(trigger, state); | |
2780 | if (ret) { | |
505b2d90 | 2781 | goto error_put_client_list; |
ab0ee2ca | 2782 | } |
f82f93a1 | 2783 | break; |
51eab943 JG |
2784 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2785 | /* | |
2786 | * Add the trigger to list of triggers bound to the channels | |
2787 | * currently known. | |
2788 | */ | |
2789 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2790 | if (ret) { | |
505b2d90 | 2791 | goto error_put_client_list; |
ab0ee2ca | 2792 | } |
51eab943 JG |
2793 | break; |
2794 | case LTTNG_OBJECT_TYPE_NONE: | |
2795 | break; | |
2796 | default: | |
f2b3ef9f | 2797 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2798 | ret = -1; |
505b2d90 | 2799 | goto error_put_client_list; |
ab0ee2ca JG |
2800 | } |
2801 | ||
2ae99f0b | 2802 | /* |
f2b3ef9f JG |
2803 | * The new trigger's condition must be evaluated against the current |
2804 | * state. | |
2805 | * | |
2806 | * In the case of `notify` action, nothing preventing clients from | |
2807 | * subscribing to a condition before the corresponding trigger is | |
2808 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2809 | * |
2810 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2811 | * reception of a channel sample) to evaluate this new condition, but | |
2812 | * that was broken. | |
2813 | * | |
2814 | * The reason it was broken is that waiting for the next sample | |
2815 | * does not allow us to properly handle transitions for edge-triggered | |
2816 | * conditions. | |
2817 | * | |
2818 | * Consider this example: when we handle a new channel sample, we | |
2819 | * evaluate each conditions twice: once with the previous state, and | |
2820 | * again with the newest state. We then use those two results to | |
2821 | * determine whether a state change happened: a condition was false and | |
2822 | * became true. If a state change happened, we have to notify clients. | |
2823 | * | |
2824 | * Now, if a client subscribes to a given notification and registers | |
2825 | * a trigger *after* that subscription, we have to make sure the | |
2826 | * condition is evaluated at this point while considering only the | |
2827 | * current state. Otherwise, the next evaluation cycle may only see | |
2828 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2829 | * the client will never know that the condition has been met. | |
2830 | */ | |
f2b3ef9f JG |
2831 | switch (get_condition_binding_object(condition)) { |
2832 | case LTTNG_OBJECT_TYPE_SESSION: | |
2833 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2834 | &evaluation, &object_uid, |
2835 | &object_gid); | |
bc8daafb JG |
2836 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2837 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2838 | break; |
f2b3ef9f JG |
2839 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2840 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2841 | &evaluation, &object_uid, |
2842 | &object_gid); | |
bc8daafb JG |
2843 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2844 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2845 | break; |
2846 | case LTTNG_OBJECT_TYPE_NONE: | |
2847 | ret = 0; | |
242388e4 | 2848 | break; |
f2b3ef9f JG |
2849 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2850 | default: | |
2851 | ret = -1; | |
242388e4 | 2852 | break; |
f2b3ef9f JG |
2853 | } |
2854 | ||
2855 | if (ret) { | |
2856 | /* Fatal error. */ | |
2857 | goto error_put_client_list; | |
2858 | } | |
2859 | ||
2860 | DBG("Newly registered trigger's condition evaluated to %s", | |
2861 | evaluation ? "true" : "false"); | |
2862 | if (!evaluation) { | |
2863 | /* Evaluation yielded nothing. Normal exit. */ | |
2864 | ret = 0; | |
242388e4 | 2865 | goto end; |
2ae99f0b JG |
2866 | } |
2867 | ||
2868 | /* | |
f2b3ef9f JG |
2869 | * Ownership of `evaluation` transferred to the action executor |
2870 | * no matter the result. | |
2ae99f0b | 2871 | */ |
f2b3ef9f JG |
2872 | executor_status = action_executor_enqueue(state->executor, trigger, |
2873 | evaluation, &object_creds, client_list); | |
2874 | evaluation = NULL; | |
2875 | switch (executor_status) { | |
2876 | case ACTION_EXECUTOR_STATUS_OK: | |
2877 | break; | |
2878 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2879 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2880 | /* | |
2881 | * TODO Add trigger identification (name/id) when | |
2882 | * it is added to the API. | |
2883 | */ | |
2884 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2885 | ret = -1; | |
2886 | goto error_put_client_list; | |
2887 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
2888 | /* | |
2889 | * TODO Add trigger identification (name/id) when | |
2890 | * it is added to the API. | |
2891 | * | |
2892 | * Not a fatal error. | |
2893 | */ | |
2894 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2895 | ret = 0; | |
242388e4 | 2896 | goto end; |
f2b3ef9f JG |
2897 | default: |
2898 | abort(); | |
2899 | } | |
2ae99f0b | 2900 | |
242388e4 | 2901 | end: |
ab0ee2ca | 2902 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2903 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2904 | trigger_name, trigger_tracer_token); | |
505b2d90 JG |
2905 | |
2906 | error_put_client_list: | |
2907 | notification_client_list_put(client_list); | |
2908 | ||
ab0ee2ca | 2909 | error_free_ht_element: |
242388e4 JR |
2910 | if (trigger_ht_element) { |
2911 | /* Delayed removal due to RCU constraint on delete. */ | |
2912 | call_rcu(&trigger_ht_element->rcu_node, | |
2913 | free_lttng_trigger_ht_element_rcu); | |
2914 | } | |
2915 | ||
e7c93cf9 | 2916 | free(trigger_tokens_ht_element); |
ab0ee2ca JG |
2917 | error: |
2918 | if (free_trigger) { | |
ab0ee2ca JG |
2919 | lttng_trigger_destroy(trigger); |
2920 | } | |
2921 | rcu_read_unlock(); | |
2922 | return ret; | |
2923 | } | |
2924 | ||
83b934ad MD |
2925 | static |
2926 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2927 | { | |
2928 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2929 | rcu_node)); | |
2930 | } | |
2931 | ||
e7c93cf9 JR |
2932 | static |
2933 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
2934 | { | |
2935 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
2936 | rcu_node)); | |
2937 | } | |
2938 | ||
cc2295b5 | 2939 | static |
ab0ee2ca JG |
2940 | int handle_notification_thread_command_unregister_trigger( |
2941 | struct notification_thread_state *state, | |
ac16173e | 2942 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
2943 | enum lttng_error_code *_cmd_reply) |
2944 | { | |
2945 | struct cds_lfht_iter iter; | |
ed327204 | 2946 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
2947 | struct lttng_channel_trigger_list *trigger_list; |
2948 | struct notification_client_list *client_list; | |
ab0ee2ca | 2949 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 2950 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 2951 | trigger); |
ab0ee2ca JG |
2952 | enum lttng_error_code cmd_reply; |
2953 | ||
2954 | rcu_read_lock(); | |
2955 | ||
2956 | cds_lfht_lookup(state->triggers_ht, | |
2957 | lttng_condition_hash(condition), | |
242388e4 JR |
2958 | match_trigger, |
2959 | trigger, | |
ab0ee2ca JG |
2960 | &iter); |
2961 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
2962 | if (!triggers_ht_node) { | |
2963 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2964 | goto end; | |
2965 | } else { | |
2966 | cmd_reply = LTTNG_OK; | |
2967 | } | |
2968 | ||
2969 | /* Remove trigger from channel_triggers_ht. */ | |
2970 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
2971 | channel_triggers_ht_node) { | |
2972 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
2973 | ||
2974 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
2975 | &trigger_list->list, node) { | |
e8f7fa11 | 2976 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
2977 | continue; |
2978 | } | |
2979 | ||
2980 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
2981 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
2982 | /* A trigger can only appear once per channel */ |
2983 | break; | |
ab0ee2ca JG |
2984 | } |
2985 | } | |
2986 | ||
e7c93cf9 | 2987 | if (lttng_condition_get_type(condition) == |
d602bd6a | 2988 | LTTNG_CONDITION_TYPE_ON_EVENT) { |
e7c93cf9 JR |
2989 | struct notification_trigger_tokens_ht_element |
2990 | *trigger_tokens_ht_element; | |
2991 | ||
2992 | cds_lfht_for_each_entry (state->trigger_tokens_ht, &iter, | |
2993 | trigger_tokens_ht_element, node) { | |
2994 | if (!lttng_trigger_is_equal(trigger, | |
2995 | trigger_tokens_ht_element->trigger)) { | |
2996 | continue; | |
2997 | } | |
2998 | ||
90aa04a1 FD |
2999 | if (trigger_needs_tracer_notifier(trigger_tokens_ht_element->trigger)) { |
3000 | event_notifier_error_accounting_unregister_event_notifier( | |
3001 | trigger_tokens_ht_element->trigger); | |
3002 | } | |
3003 | ||
e7c93cf9 JR |
3004 | DBG("[notification-thread] Removed trigger from tokens_ht"); |
3005 | cds_lfht_del(state->trigger_tokens_ht, | |
3006 | &trigger_tokens_ht_element->node); | |
3007 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
3008 | free_notification_trigger_tokens_ht_element_rcu); | |
3009 | ||
3010 | break; | |
3011 | } | |
3012 | } | |
3013 | ||
51367634 JR |
3014 | if (is_trigger_action_notify(trigger)) { |
3015 | /* | |
3016 | * Remove and release the client list from | |
3017 | * notification_trigger_clients_ht. | |
3018 | */ | |
3019 | client_list = get_client_list_from_condition(state, condition); | |
3020 | assert(client_list); | |
ed327204 | 3021 | |
51367634 JR |
3022 | /* Put new reference and the hashtable's reference. */ |
3023 | notification_client_list_put(client_list); | |
3024 | notification_client_list_put(client_list); | |
3025 | client_list = NULL; | |
3026 | } | |
ab0ee2ca JG |
3027 | |
3028 | /* Remove trigger from triggers_ht. */ | |
3029 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
3030 | struct lttng_trigger_ht_element, node); | |
242388e4 | 3031 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
3032 | cds_lfht_del(state->triggers_ht, triggers_ht_node); |
3033 | ||
7ca172c1 | 3034 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 3035 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 3036 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
3037 | end: |
3038 | rcu_read_unlock(); | |
3039 | if (_cmd_reply) { | |
3040 | *_cmd_reply = cmd_reply; | |
3041 | } | |
3042 | return 0; | |
3043 | } | |
3044 | ||
3045 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
3046 | int handle_notification_thread_command( | |
3047 | struct notification_thread_handle *handle, | |
3048 | struct notification_thread_state *state) | |
3049 | { | |
3050 | int ret; | |
3051 | uint64_t counter; | |
3052 | struct notification_thread_command *cmd; | |
3053 | ||
8abe313a | 3054 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 3055 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 3056 | sizeof(counter)); |
18aeca05 | 3057 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
3058 | goto error; |
3059 | } | |
3060 | ||
3061 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
3062 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
3063 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
3064 | cds_list_del(&cmd->cmd_list_node); |
3065 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
6900ae81 FD |
3066 | |
3067 | DBG("[notification-thread] Received `%s` command", | |
3068 | notification_command_type_str(cmd->type)); | |
ab0ee2ca JG |
3069 | switch (cmd->type) { |
3070 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
3071 | ret = handle_notification_thread_command_register_trigger(state, |
3072 | cmd->parameters.register_trigger.trigger, | |
ab0ee2ca JG |
3073 | &cmd->reply_code); |
3074 | break; | |
3075 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 3076 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
3077 | state, |
3078 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
3079 | &cmd->reply_code); |
3080 | break; | |
3081 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 3082 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
3083 | state, |
3084 | cmd->parameters.add_channel.session.name, | |
3085 | cmd->parameters.add_channel.session.uid, | |
3086 | cmd->parameters.add_channel.session.gid, | |
3087 | cmd->parameters.add_channel.channel.name, | |
3088 | cmd->parameters.add_channel.channel.domain, | |
3089 | cmd->parameters.add_channel.channel.key, | |
3090 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
3091 | &cmd->reply_code); |
3092 | break; | |
3093 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
3094 | ret = handle_notification_thread_command_remove_channel( |
3095 | state, cmd->parameters.remove_channel.key, | |
3096 | cmd->parameters.remove_channel.domain, | |
3097 | &cmd->reply_code); | |
3098 | break; | |
0ca52944 | 3099 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 3100 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 3101 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 3102 | state, |
ed327204 JG |
3103 | cmd->type, |
3104 | cmd->parameters.session_rotation.session_name, | |
3105 | cmd->parameters.session_rotation.uid, | |
3106 | cmd->parameters.session_rotation.gid, | |
3107 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
3108 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
3109 | &cmd->reply_code); |
3110 | break; | |
d02d7404 JR |
3111 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
3112 | ret = handle_notification_thread_command_add_tracer_event_source( | |
3113 | state, | |
3114 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3115 | cmd->parameters.tracer_event_source.domain, | |
3116 | &cmd->reply_code); | |
3117 | break; | |
3118 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
3119 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
3120 | state, | |
3121 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3122 | &cmd->reply_code); | |
3123 | break; | |
fbc9f37d JR |
3124 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
3125 | { | |
3126 | struct lttng_triggers *triggers = NULL; | |
3127 | ||
3128 | ret = handle_notification_thread_command_list_triggers( | |
3129 | handle, | |
3130 | state, | |
3131 | cmd->parameters.list_triggers.uid, | |
3132 | &triggers, | |
3133 | &cmd->reply_code); | |
3134 | cmd->reply.list_triggers.triggers = triggers; | |
3135 | ret = 0; | |
3136 | break; | |
3137 | } | |
ab0ee2ca | 3138 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
3139 | cmd->reply_code = LTTNG_OK; |
3140 | ret = 1; | |
3141 | goto end; | |
f2b3ef9f JG |
3142 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
3143 | { | |
3144 | const enum client_transmission_status client_status = | |
3145 | cmd->parameters.client_communication_update | |
3146 | .status; | |
3147 | const notification_client_id client_id = | |
3148 | cmd->parameters.client_communication_update.id; | |
3149 | struct notification_client *client; | |
3150 | ||
3151 | rcu_read_lock(); | |
3152 | client = get_client_from_id(client_id, state); | |
3153 | ||
3154 | if (!client) { | |
3155 | /* | |
3156 | * Client error was probably already picked-up by the | |
3157 | * notification thread or it has disconnected | |
3158 | * gracefully while this command was queued. | |
3159 | */ | |
3160 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
3161 | client_id); | |
3162 | ret = 0; | |
3163 | } else { | |
f2b3ef9f JG |
3164 | ret = client_handle_transmission_status( |
3165 | client, client_status, state); | |
f2b3ef9f JG |
3166 | } |
3167 | rcu_read_unlock(); | |
3168 | break; | |
3169 | } | |
ab0ee2ca JG |
3170 | default: |
3171 | ERR("[notification-thread] Unknown internal command received"); | |
3172 | goto error_unlock; | |
3173 | } | |
3174 | ||
3175 | if (ret) { | |
3176 | goto error_unlock; | |
3177 | } | |
3178 | end: | |
0ab399e0 JG |
3179 | if (cmd->is_async) { |
3180 | free(cmd); | |
3181 | cmd = NULL; | |
3182 | } else { | |
3183 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3184 | } | |
ab0ee2ca JG |
3185 | return ret; |
3186 | error_unlock: | |
3187 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3188 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3189 | cmd->reply_code = LTTNG_ERR_FATAL; |
3190 | error: | |
3191 | /* Indicate a fatal error to the caller. */ | |
3192 | return -1; | |
3193 | } | |
3194 | ||
ab0ee2ca JG |
3195 | static |
3196 | int socket_set_non_blocking(int socket) | |
3197 | { | |
3198 | int ret, flags; | |
3199 | ||
3200 | /* Set the pipe as non-blocking. */ | |
3201 | ret = fcntl(socket, F_GETFL, 0); | |
3202 | if (ret == -1) { | |
3203 | PERROR("fcntl get socket flags"); | |
3204 | goto end; | |
3205 | } | |
3206 | flags = ret; | |
3207 | ||
3208 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3209 | if (ret == -1) { | |
3210 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3211 | goto end; | |
3212 | } | |
3213 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3214 | end: | |
3215 | return ret; | |
3216 | } | |
3217 | ||
3218 | static | |
14fa22f8 | 3219 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3220 | { |
3221 | int ret; | |
3222 | ||
882093ee JR |
3223 | |
3224 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3225 | |
3226 | client->communication.inbound.bytes_to_receive = | |
3227 | sizeof(struct lttng_notification_channel_message); | |
3228 | client->communication.inbound.msg_type = | |
3229 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3230 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3231 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3232 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3233 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3234 | client->communication.inbound.bytes_to_receive); |
882093ee | 3235 | |
14fa22f8 | 3236 | return ret; |
ab0ee2ca JG |
3237 | } |
3238 | ||
3239 | int handle_notification_thread_client_connect( | |
3240 | struct notification_thread_state *state) | |
3241 | { | |
3242 | int ret; | |
3243 | struct notification_client *client; | |
3244 | ||
3245 | DBG("[notification-thread] Handling new notification channel client connection"); | |
3246 | ||
3247 | client = zmalloc(sizeof(*client)); | |
3248 | if (!client) { | |
3249 | /* Fatal error. */ | |
3250 | ret = -1; | |
3251 | goto error; | |
3252 | } | |
6c24d3fd | 3253 | |
505b2d90 | 3254 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3255 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3256 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3257 | lttng_payload_init(&client->communication.inbound.payload); |
3258 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3259 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3260 | |
14fa22f8 JG |
3261 | ret = client_reset_inbound_state(client); |
3262 | if (ret) { | |
3263 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
e742b055 | 3264 | ret = 0; |
14fa22f8 JG |
3265 | goto error; |
3266 | } | |
ab0ee2ca JG |
3267 | |
3268 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3269 | if (ret < 0) { | |
3270 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
3271 | ret = 0; | |
3272 | goto error; | |
3273 | } | |
3274 | ||
3275 | client->socket = ret; | |
3276 | ||
3277 | ret = socket_set_non_blocking(client->socket); | |
3278 | if (ret) { | |
3279 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
3280 | goto error; | |
3281 | } | |
3282 | ||
3283 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3284 | if (ret < 0) { | |
3285 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
3286 | ret = 0; | |
3287 | goto error; | |
3288 | } | |
3289 | ||
3290 | ret = lttng_poll_add(&state->events, client->socket, | |
3291 | LPOLLIN | LPOLLERR | | |
3292 | LPOLLHUP | LPOLLRDHUP); | |
3293 | if (ret < 0) { | |
3294 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
3295 | ret = 0; | |
3296 | goto error; | |
3297 | } | |
3298 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
3299 | client->socket); | |
3300 | ||
ab0ee2ca JG |
3301 | rcu_read_lock(); |
3302 | cds_lfht_add(state->client_socket_ht, | |
3303 | hash_client_socket(client->socket), | |
3304 | &client->client_socket_ht_node); | |
ac1889bf JG |
3305 | cds_lfht_add(state->client_id_ht, |
3306 | hash_client_id(client->id), | |
3307 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3308 | rcu_read_unlock(); |
3309 | ||
3310 | return ret; | |
6c24d3fd | 3311 | |
ab0ee2ca JG |
3312 | error: |
3313 | notification_client_destroy(client, state); | |
3314 | return ret; | |
3315 | } | |
3316 | ||
6c24d3fd JG |
3317 | /* |
3318 | * RCU read-lock must be held by the caller. | |
3319 | * Client lock must _not_ be held by the caller. | |
3320 | */ | |
505b2d90 JG |
3321 | static |
3322 | int notification_thread_client_disconnect( | |
3323 | struct notification_client *client, | |
ab0ee2ca | 3324 | struct notification_thread_state *state) |
505b2d90 JG |
3325 | { |
3326 | int ret; | |
3327 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3328 | ||
3329 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 3330 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3331 | client->communication.active = false; |
6c24d3fd JG |
3332 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3333 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3334 | pthread_mutex_unlock(&client->lock); | |
3335 | ||
505b2d90 JG |
3336 | ret = lttng_poll_del(&state->events, client->socket); |
3337 | if (ret) { | |
3338 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
3339 | client->socket); | |
3340 | } | |
3341 | ||
505b2d90 JG |
3342 | /* Release all conditions to which the client was subscribed. */ |
3343 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3344 | &client->condition_list, node) { | |
3345 | (void) notification_thread_client_unsubscribe(client, | |
3346 | condition_list_element->condition, state, NULL); | |
3347 | } | |
3348 | ||
3349 | /* | |
3350 | * Client no longer accessible to other threads (through the | |
3351 | * client lists). | |
3352 | */ | |
3353 | notification_client_destroy(client, state); | |
3354 | return ret; | |
3355 | } | |
3356 | ||
3357 | int handle_notification_thread_client_disconnect( | |
3358 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3359 | { |
3360 | int ret = 0; | |
3361 | struct notification_client *client; | |
3362 | ||
3363 | rcu_read_lock(); | |
3364 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
3365 | client_socket); | |
3366 | client = get_client_from_socket(client_socket, state); | |
3367 | if (!client) { | |
3368 | /* Internal state corruption, fatal error. */ | |
3369 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
3370 | client_socket); | |
3371 | ret = -1; | |
3372 | goto end; | |
3373 | } | |
3374 | ||
505b2d90 | 3375 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3376 | end: |
3377 | rcu_read_unlock(); | |
3378 | return ret; | |
3379 | } | |
3380 | ||
3381 | int handle_notification_thread_client_disconnect_all( | |
3382 | struct notification_thread_state *state) | |
3383 | { | |
3384 | struct cds_lfht_iter iter; | |
3385 | struct notification_client *client; | |
3386 | bool error_encoutered = false; | |
3387 | ||
3388 | rcu_read_lock(); | |
3389 | DBG("[notification-thread] Closing all client connections"); | |
3390 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
505b2d90 | 3391 | client_socket_ht_node) { |
ab0ee2ca JG |
3392 | int ret; |
3393 | ||
505b2d90 JG |
3394 | ret = notification_thread_client_disconnect( |
3395 | client, state); | |
ab0ee2ca JG |
3396 | if (ret) { |
3397 | error_encoutered = true; | |
3398 | } | |
3399 | } | |
3400 | rcu_read_unlock(); | |
3401 | return error_encoutered ? 1 : 0; | |
3402 | } | |
3403 | ||
3404 | int handle_notification_thread_trigger_unregister_all( | |
3405 | struct notification_thread_state *state) | |
3406 | { | |
4149ace8 | 3407 | bool error_occurred = false; |
ab0ee2ca JG |
3408 | struct cds_lfht_iter iter; |
3409 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3410 | ||
763de384 | 3411 | rcu_read_lock(); |
ab0ee2ca JG |
3412 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3413 | node) { | |
3414 | int ret = handle_notification_thread_command_unregister_trigger( | |
3415 | state, trigger_ht_element->trigger, NULL); | |
3416 | if (ret) { | |
4149ace8 | 3417 | error_occurred = true; |
ab0ee2ca JG |
3418 | } |
3419 | } | |
763de384 | 3420 | rcu_read_unlock(); |
4149ace8 | 3421 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3422 | } |
3423 | ||
dd877ea6 JG |
3424 | static |
3425 | int client_handle_transmission_status( | |
3426 | struct notification_client *client, | |
3427 | enum client_transmission_status transmission_status, | |
3428 | struct notification_thread_state *state) | |
3429 | { | |
3430 | int ret = 0; | |
3431 | ||
3432 | switch (transmission_status) { | |
3433 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3434 | ret = lttng_poll_mod(&state->events, client->socket, | |
3435 | CLIENT_POLL_MASK_IN); | |
3436 | if (ret) { | |
3437 | goto end; | |
3438 | } | |
3439 | ||
dd877ea6 JG |
3440 | break; |
3441 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3442 | /* | |
3443 | * We want to be notified whenever there is buffer space | |
3444 | * available to send the rest of the payload. | |
3445 | */ | |
3446 | ret = lttng_poll_mod(&state->events, client->socket, | |
3447 | CLIENT_POLL_MASK_IN_OUT); | |
3448 | if (ret) { | |
3449 | goto end; | |
3450 | } | |
3451 | break; | |
3452 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3453 | ret = notification_thread_client_disconnect(client, state); | |
3454 | if (ret) { | |
3455 | goto end; | |
3456 | } | |
3457 | break; | |
3458 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3459 | ret = -1; | |
3460 | goto end; | |
3461 | default: | |
3462 | abort(); | |
3463 | } | |
3464 | end: | |
3465 | return ret; | |
3466 | } | |
3467 | ||
505b2d90 | 3468 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3469 | static |
dd877ea6 | 3470 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3471 | struct notification_client *client) |
ab0ee2ca JG |
3472 | { |
3473 | ssize_t ret; | |
3474 | size_t to_send_count; | |
dd877ea6 | 3475 | enum client_transmission_status status; |
882093ee JR |
3476 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3477 | &client->communication.outbound.payload, 0, -1); | |
3478 | const int fds_to_send_count = | |
3479 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3480 | |
505b2d90 JG |
3481 | ASSERT_LOCKED(client->lock); |
3482 | ||
f2b3ef9f JG |
3483 | if (!client->communication.active) { |
3484 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3485 | goto end; | |
3486 | } | |
3487 | ||
882093ee JR |
3488 | if (pv.buffer.size == 0) { |
3489 | /* | |
3490 | * If both data and fds are equal to zero, we are in an invalid | |
3491 | * state. | |
3492 | */ | |
3493 | assert(fds_to_send_count != 0); | |
3494 | goto send_fds; | |
3495 | } | |
3496 | ||
3497 | /* Send data. */ | |
3498 | to_send_count = pv.buffer.size; | |
ab0ee2ca JG |
3499 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", |
3500 | client->socket); | |
3501 | ||
3502 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3503 | pv.buffer.data, |
ab0ee2ca | 3504 | to_send_count); |
44c180ca | 3505 | if ((ret >= 0 && ret < to_send_count)) { |
ab0ee2ca JG |
3506 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", |
3507 | client->socket); | |
3508 | to_send_count -= max(ret, 0); | |
3509 | ||
6f110534 | 3510 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3511 | pv.buffer.data + |
3512 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3513 | to_send_count); |
3514 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3515 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3516 | to_send_count); |
3517 | if (ret) { | |
3518 | goto error; | |
3519 | } | |
6c24d3fd | 3520 | |
dd877ea6 | 3521 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3522 | goto end; |
ab0ee2ca | 3523 | } else if (ret < 0) { |
6c24d3fd | 3524 | /* Generic error, disable the client's communication. */ |
dd877ea6 | 3525 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3526 | client->socket); |
6c24d3fd | 3527 | client->communication.active = false; |
dd877ea6 | 3528 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3529 | goto end; |
ab0ee2ca | 3530 | } else { |
882093ee JR |
3531 | /* |
3532 | * No error and flushed the queue completely. | |
3533 | * | |
3534 | * The payload buffer size is used later to | |
3535 | * check if there is notifications queued. So albeit that the | |
3536 | * direct caller knows that the transmission is complete, we | |
3537 | * need to set the buffer size to zero. | |
3538 | */ | |
ab0ee2ca | 3539 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3540 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3541 | if (ret) { |
3542 | goto error; | |
3543 | } | |
882093ee | 3544 | } |
6c24d3fd | 3545 | |
882093ee JR |
3546 | send_fds: |
3547 | /* No fds to send, transmission is complete. */ | |
3548 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3549 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3550 | goto end; |
dd877ea6 | 3551 | } |
882093ee JR |
3552 | |
3553 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3554 | client->socket, &pv); | |
3555 | if (ret < 0) { | |
3556 | /* Generic error, disable the client's communication. */ | |
3557 | ERR("[notification-thread] Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", | |
3558 | client->socket); | |
3559 | client->communication.active = false; | |
3560 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3561 | goto end; | |
3562 | } else if (ret == 0) { | |
3563 | /* Nothing could be sent. */ | |
3564 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3565 | } else { | |
3566 | /* Fd passing is an all or nothing kind of thing. */ | |
3567 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3568 | /* | |
3569 | * The payload _fd_array count is used later to | |
3570 | * check if there is notifications queued. So although the | |
3571 | * direct caller knows that the transmission is complete, we | |
3572 | * need to clear the _fd_array for the queuing check. | |
3573 | */ | |
3574 | lttng_dynamic_pointer_array_clear( | |
3575 | &client->communication.outbound.payload | |
3576 | ._fd_handles); | |
3577 | } | |
3578 | ||
f2b3ef9f | 3579 | end: |
882093ee JR |
3580 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3581 | client->communication.outbound.queued_command_reply = false; | |
3582 | client->communication.outbound.dropped_notification = false; | |
3583 | lttng_payload_clear(&client->communication.outbound.payload); | |
3584 | } | |
3585 | ||
f2b3ef9f | 3586 | return status; |
ab0ee2ca | 3587 | error: |
f2b3ef9f | 3588 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3589 | } |
3590 | ||
882093ee JR |
3591 | static |
3592 | bool client_has_outbound_data_left( | |
3593 | const struct notification_client *client) | |
3594 | { | |
3595 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3596 | &client->communication.outbound.payload, 0, -1); | |
3597 | const bool has_data = pv.buffer.size != 0; | |
3598 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3599 | ||
3600 | return has_data || has_fds; | |
3601 | } | |
3602 | ||
6c24d3fd | 3603 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3604 | static |
3605 | int client_send_command_reply(struct notification_client *client, | |
3606 | struct notification_thread_state *state, | |
3607 | enum lttng_notification_channel_status status) | |
3608 | { | |
3609 | int ret; | |
3610 | struct lttng_notification_channel_command_reply reply = { | |
3611 | .status = (int8_t) status, | |
3612 | }; | |
3613 | struct lttng_notification_channel_message msg = { | |
3614 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3615 | .size = sizeof(reply), | |
3616 | }; | |
3617 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3618 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3619 | |
6c24d3fd JG |
3620 | memcpy(buffer, &msg, sizeof(msg)); |
3621 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
3622 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
505b2d90 | 3623 | |
6c24d3fd | 3624 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3625 | if (client->communication.outbound.queued_command_reply) { |
3626 | /* Protocol error. */ | |
6c24d3fd | 3627 | goto error_unlock; |
ab0ee2ca JG |
3628 | } |
3629 | ||
ab0ee2ca JG |
3630 | /* Enqueue buffer to outgoing queue and flush it. */ |
3631 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3632 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3633 | buffer, sizeof(buffer)); |
3634 | if (ret) { | |
6c24d3fd | 3635 | goto error_unlock; |
ab0ee2ca JG |
3636 | } |
3637 | ||
f2b3ef9f | 3638 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3639 | |
3640 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3641 | /* Queue could not be emptied. */ |
3642 | client->communication.outbound.queued_command_reply = true; | |
3643 | } | |
3644 | ||
3645 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3646 | ret = client_handle_transmission_status( |
3647 | client, transmission_status, state); | |
ab0ee2ca JG |
3648 | if (ret) { |
3649 | goto error; | |
3650 | } | |
3651 | ||
ab0ee2ca | 3652 | return 0; |
6c24d3fd JG |
3653 | error_unlock: |
3654 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3655 | error: |
3656 | return -1; | |
3657 | } | |
3658 | ||
505b2d90 JG |
3659 | static |
3660 | int client_handle_message_unknown(struct notification_client *client, | |
3661 | struct notification_thread_state *state) | |
3662 | { | |
3663 | int ret; | |
505b2d90 JG |
3664 | /* |
3665 | * Receiving message header. The function will be called again | |
3666 | * once the rest of the message as been received and can be | |
3667 | * interpreted. | |
3668 | */ | |
3669 | const struct lttng_notification_channel_message *msg; | |
3670 | ||
882093ee | 3671 | assert(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3672 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3673 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3674 | |
3675 | if (msg->size == 0 || | |
3676 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
3677 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
3678 | msg->size); | |
3679 | ret = -1; | |
3680 | goto end; | |
3681 | } | |
3682 | ||
3683 | switch (msg->type) { | |
3684 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3685 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3686 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3687 | break; | |
3688 | default: | |
3689 | ret = -1; | |
3690 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
3691 | goto end; | |
3692 | } | |
3693 | ||
3694 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3695 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3696 | client->communication.inbound.msg_type = |
3697 | (enum lttng_notification_channel_message_type) msg->type; | |
3698 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3699 | &client->communication.inbound.payload.buffer, msg->size); |
3700 | ||
3701 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3702 | msg = NULL; | |
505b2d90 | 3703 | end: |
505b2d90 JG |
3704 | return ret; |
3705 | } | |
3706 | ||
3707 | static | |
3708 | int client_handle_message_handshake(struct notification_client *client, | |
3709 | struct notification_thread_state *state) | |
3710 | { | |
3711 | int ret; | |
3712 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3713 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3714 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3715 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3716 | }; | |
3717 | const struct lttng_notification_channel_message msg_header = { | |
3718 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3719 | .size = sizeof(handshake_reply), | |
3720 | }; | |
3721 | enum lttng_notification_channel_status status = | |
3722 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3723 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3724 | |
3725 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3726 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3727 | sizeof(handshake_reply)); | |
3728 | ||
3729 | handshake_client = | |
3730 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3731 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3732 | .data; |
3733 | client->major = handshake_client->major; | |
3734 | client->minor = handshake_client->minor; | |
3735 | if (!client->communication.inbound.creds_received) { | |
3736 | ERR("[notification-thread] No credentials received from client"); | |
3737 | ret = -1; | |
3738 | goto end; | |
3739 | } | |
3740 | ||
3741 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3742 | &client->communication.inbound.creds); | |
3743 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3744 | &client->communication.inbound.creds); | |
3745 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
3746 | client->uid, client->gid, (int) client->major, | |
3747 | (int) client->minor); | |
3748 | ||
3749 | if (handshake_client->major != | |
3750 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3751 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3752 | } | |
3753 | ||
6c24d3fd JG |
3754 | pthread_mutex_lock(&client->lock); |
3755 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3756 | ret = lttng_dynamic_buffer_append( |
882093ee | 3757 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3758 | sizeof(send_buffer)); |
3759 | if (ret) { | |
3760 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
6c24d3fd | 3761 | goto end_unlock; |
505b2d90 JG |
3762 | } |
3763 | ||
3764 | client->validated = true; | |
3765 | client->communication.active = true; | |
6c24d3fd | 3766 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3767 | |
6c24d3fd JG |
3768 | /* Set reception state to receive the next message header. */ |
3769 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3770 | if (ret) { |
6c24d3fd | 3771 | ERR("[notification-thread] Failed to reset client communication's inbound state"); |
505b2d90 JG |
3772 | goto end; |
3773 | } | |
3774 | ||
6c24d3fd | 3775 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3776 | ret = client_send_command_reply(client, state, status); |
3777 | if (ret) { | |
3778 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3779 | goto end; | |
3780 | } | |
3781 | ||
6c24d3fd JG |
3782 | goto end; |
3783 | end_unlock: | |
505b2d90 | 3784 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3785 | end: |
505b2d90 JG |
3786 | return ret; |
3787 | } | |
3788 | ||
3789 | static | |
3790 | int client_handle_message_subscription( | |
3791 | struct notification_client *client, | |
3792 | enum lttng_notification_channel_message_type msg_type, | |
3793 | struct notification_thread_state *state) | |
3794 | { | |
3795 | int ret; | |
3796 | struct lttng_condition *condition; | |
3797 | enum lttng_notification_channel_status status = | |
3798 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3799 | struct lttng_payload_view condition_view = | |
882093ee JR |
3800 | lttng_payload_view_from_payload( |
3801 | &client->communication.inbound.payload, | |
505b2d90 JG |
3802 | 0, -1); |
3803 | size_t expected_condition_size; | |
3804 | ||
6c24d3fd JG |
3805 | /* |
3806 | * No need to lock client to sample the inbound state as the only | |
3807 | * other thread accessing clients (action executor) only uses the | |
3808 | * outbound state. | |
3809 | */ | |
882093ee | 3810 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3811 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3812 | if (ret != expected_condition_size) { | |
3813 | ERR("[notification-thread] Malformed condition received from client"); | |
3814 | goto end; | |
3815 | } | |
3816 | ||
3817 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
3818 | ret = notification_thread_client_subscribe( | |
3819 | client, condition, state, &status); | |
3820 | } else { | |
3821 | ret = notification_thread_client_unsubscribe( | |
3822 | client, condition, state, &status); | |
3823 | } | |
505b2d90 | 3824 | |
505b2d90 | 3825 | if (ret) { |
6c24d3fd | 3826 | goto end; |
505b2d90 JG |
3827 | } |
3828 | ||
3829 | /* Set reception state to receive the next message header. */ | |
3830 | ret = client_reset_inbound_state(client); | |
3831 | if (ret) { | |
3832 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
6c24d3fd JG |
3833 | goto end; |
3834 | } | |
3835 | ||
3836 | ret = client_send_command_reply(client, state, status); | |
3837 | if (ret) { | |
3838 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3839 | goto end; | |
505b2d90 JG |
3840 | } |
3841 | ||
505b2d90 JG |
3842 | end: |
3843 | return ret; | |
3844 | } | |
3845 | ||
ab0ee2ca JG |
3846 | static |
3847 | int client_dispatch_message(struct notification_client *client, | |
3848 | struct notification_thread_state *state) | |
3849 | { | |
3850 | int ret = 0; | |
3851 | ||
3852 | if (client->communication.inbound.msg_type != | |
3853 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3854 | client->communication.inbound.msg_type != | |
3855 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3856 | !client->validated) { | |
3857 | WARN("[notification-thread] client attempted a command before handshake"); | |
3858 | ret = -1; | |
3859 | goto end; | |
3860 | } | |
3861 | ||
3862 | switch (client->communication.inbound.msg_type) { | |
3863 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3864 | { | |
505b2d90 | 3865 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3866 | break; |
3867 | } | |
3868 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3869 | { | |
505b2d90 | 3870 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3871 | break; |
3872 | } | |
3873 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3874 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3875 | { | |
505b2d90 JG |
3876 | ret = client_handle_message_subscription(client, |
3877 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3878 | break; |
3879 | } | |
3880 | default: | |
3881 | abort(); | |
3882 | } | |
3883 | end: | |
3884 | return ret; | |
3885 | } | |
3886 | ||
3887 | /* Incoming data from client. */ | |
3888 | int handle_notification_thread_client_in( | |
3889 | struct notification_thread_state *state, int socket) | |
3890 | { | |
14fa22f8 | 3891 | int ret = 0; |
ab0ee2ca JG |
3892 | struct notification_client *client; |
3893 | ssize_t recv_ret; | |
3894 | size_t offset; | |
3895 | ||
98b5ff34 | 3896 | rcu_read_lock(); |
ab0ee2ca JG |
3897 | client = get_client_from_socket(socket, state); |
3898 | if (!client) { | |
3899 | /* Internal error, abort. */ | |
3900 | ret = -1; | |
3901 | goto end; | |
3902 | } | |
3903 | ||
882093ee | 3904 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3905 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3906 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3907 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3908 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3909 | client->communication.inbound.bytes_to_receive, |
3910 | &client->communication.inbound.creds); | |
3911 | if (recv_ret > 0) { | |
01ea340e | 3912 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3913 | client->communication.inbound.creds_received = true; |
3914 | } | |
3915 | } else { | |
3916 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 3917 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3918 | client->communication.inbound.bytes_to_receive); |
3919 | } | |
505b2d90 JG |
3920 | if (recv_ret >= 0) { |
3921 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
3922 | } else { |
3923 | goto error_disconnect_client; | |
505b2d90 | 3924 | } |
6c24d3fd | 3925 | |
882093ee JR |
3926 | if (client->communication.inbound.bytes_to_receive != 0) { |
3927 | /* Message incomplete wait for more data. */ | |
3928 | ret = 0; | |
3929 | goto end; | |
ab0ee2ca JG |
3930 | } |
3931 | ||
882093ee JR |
3932 | assert(client->communication.inbound.bytes_to_receive == 0); |
3933 | ||
3934 | /* Receive fds. */ | |
3935 | if (client->communication.inbound.fds_to_receive != 0) { | |
3936 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
3937 | client->socket, | |
3938 | client->communication.inbound.fds_to_receive, | |
3939 | &client->communication.inbound.payload); | |
3940 | if (ret > 0) { | |
ab0ee2ca | 3941 | /* |
882093ee JR |
3942 | * Fds received. non blocking fds passing is all |
3943 | * or nothing. | |
ab0ee2ca | 3944 | */ |
882093ee JR |
3945 | ssize_t expected_size; |
3946 | ||
3947 | expected_size = sizeof(int) * | |
3948 | client->communication.inbound | |
3949 | .fds_to_receive; | |
3950 | assert(ret == expected_size); | |
3951 | client->communication.inbound.fds_to_receive = 0; | |
3952 | } else if (ret == 0) { | |
3953 | /* Received nothing. */ | |
3954 | ret = 0; | |
3955 | goto end; | |
3956 | } else { | |
ab0ee2ca JG |
3957 | goto error_disconnect_client; |
3958 | } | |
ab0ee2ca | 3959 | } |
882093ee JR |
3960 | |
3961 | /* At this point the message is complete.*/ | |
3962 | assert(client->communication.inbound.bytes_to_receive == 0 && | |
3963 | client->communication.inbound.fds_to_receive == 0); | |
3964 | ret = client_dispatch_message(client, state); | |
3965 | if (ret) { | |
3966 | /* | |
3967 | * Only returns an error if this client must be | |
3968 | * disconnected. | |
3969 | */ | |
3970 | goto error_disconnect_client; | |
3971 | } | |
3972 | ||
ab0ee2ca | 3973 | end: |
98b5ff34 | 3974 | rcu_read_unlock(); |
ab0ee2ca | 3975 | return ret; |
882093ee | 3976 | |
ab0ee2ca | 3977 | error_disconnect_client: |
505b2d90 | 3978 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 3979 | goto end; |
ab0ee2ca JG |
3980 | } |
3981 | ||
3982 | /* Client ready to receive outgoing data. */ | |
3983 | int handle_notification_thread_client_out( | |
3984 | struct notification_thread_state *state, int socket) | |
3985 | { | |
3986 | int ret; | |
3987 | struct notification_client *client; | |
f2b3ef9f | 3988 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3989 | |
98b5ff34 | 3990 | rcu_read_lock(); |
ab0ee2ca JG |
3991 | client = get_client_from_socket(socket, state); |
3992 | if (!client) { | |
3993 | /* Internal error, abort. */ | |
3994 | ret = -1; | |
3995 | goto end; | |
3996 | } | |
3997 | ||
505b2d90 | 3998 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 3999 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
4000 | pthread_mutex_unlock(&client->lock); |
4001 | ||
f2b3ef9f JG |
4002 | ret = client_handle_transmission_status( |
4003 | client, transmission_status, state); | |
ab0ee2ca JG |
4004 | if (ret) { |
4005 | goto end; | |
4006 | } | |
4007 | end: | |
98b5ff34 | 4008 | rcu_read_unlock(); |
ab0ee2ca JG |
4009 | return ret; |
4010 | } | |
4011 | ||
4012 | static | |
e8360425 JD |
4013 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
4014 | const struct channel_state_sample *sample, | |
4015 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
4016 | { |
4017 | bool result = false; | |
4018 | uint64_t threshold; | |
4019 | enum lttng_condition_type condition_type; | |
e8360425 | 4020 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
4021 | condition, struct lttng_condition_buffer_usage, |
4022 | parent); | |
4023 | ||
ab0ee2ca JG |
4024 | if (use_condition->threshold_bytes.set) { |
4025 | threshold = use_condition->threshold_bytes.value; | |
4026 | } else { | |
4027 | /* | |
4028 | * Threshold was expressed as a ratio. | |
4029 | * | |
4030 | * TODO the threshold (in bytes) of conditions expressed | |
4031 | * as a ratio of total buffer size could be cached to | |
4032 | * forego this double-multiplication or it could be performed | |
4033 | * as fixed-point math. | |
4034 | * | |
d49487dc | 4035 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
4036 | * condition applies to multiple channels (i.e. don't assume |
4037 | * that all channels matching my_chann* have the same size...) | |
4038 | */ | |
4039 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
4040 | (double) buffer_capacity); | |
4041 | } | |
4042 | ||
4043 | condition_type = lttng_condition_get_type(condition); | |
4044 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
4045 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
4046 | threshold, sample->highest_usage); | |
4047 | ||
4048 | /* | |
4049 | * The low condition should only be triggered once _all_ of the | |
4050 | * streams in a channel have gone below the "low" threshold. | |
4051 | */ | |
4052 | if (sample->highest_usage <= threshold) { | |
4053 | result = true; | |
4054 | } | |
4055 | } else { | |
4056 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
4057 | threshold, sample->highest_usage); | |
4058 | ||
4059 | /* | |
4060 | * For high buffer usage scenarios, we want to trigger whenever | |
4061 | * _any_ of the streams has reached the "high" threshold. | |
4062 | */ | |
4063 | if (sample->highest_usage >= threshold) { | |
4064 | result = true; | |
4065 | } | |
4066 | } | |
e8360425 | 4067 | |
ab0ee2ca JG |
4068 | return result; |
4069 | } | |
4070 | ||
4071 | static | |
e8360425 JD |
4072 | bool evaluate_session_consumed_size_condition( |
4073 | const struct lttng_condition *condition, | |
4074 | uint64_t session_consumed_size) | |
4075 | { | |
4076 | uint64_t threshold; | |
4077 | const struct lttng_condition_session_consumed_size *size_condition = | |
4078 | container_of(condition, | |
4079 | struct lttng_condition_session_consumed_size, | |
4080 | parent); | |
4081 | ||
4082 | threshold = size_condition->consumed_threshold_bytes.value; | |
4083 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
4084 | threshold, session_consumed_size); | |
4085 | return session_consumed_size >= threshold; | |
4086 | } | |
4087 | ||
4088 | static | |
ed327204 | 4089 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 4090 | struct lttng_evaluation **evaluation, |
e8360425 JD |
4091 | const struct notification_thread_state *state, |
4092 | const struct channel_state_sample *previous_sample, | |
4093 | const struct channel_state_sample *latest_sample, | |
4094 | uint64_t previous_session_consumed_total, | |
4095 | uint64_t latest_session_consumed_total, | |
4096 | struct channel_info *channel_info) | |
ab0ee2ca JG |
4097 | { |
4098 | int ret = 0; | |
4099 | enum lttng_condition_type condition_type; | |
e8360425 JD |
4100 | const bool previous_sample_available = !!previous_sample; |
4101 | bool previous_sample_result = false; | |
ab0ee2ca JG |
4102 | bool latest_sample_result; |
4103 | ||
4104 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 4105 | |
e8360425 JD |
4106 | switch (condition_type) { |
4107 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4108 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
4109 | if (caa_likely(previous_sample_available)) { | |
4110 | previous_sample_result = | |
4111 | evaluate_buffer_usage_condition(condition, | |
4112 | previous_sample, channel_info->capacity); | |
4113 | } | |
4114 | latest_sample_result = evaluate_buffer_usage_condition( | |
4115 | condition, latest_sample, | |
4116 | channel_info->capacity); | |
4117 | break; | |
4118 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4119 | if (caa_likely(previous_sample_available)) { | |
4120 | previous_sample_result = | |
4121 | evaluate_session_consumed_size_condition( | |
4122 | condition, | |
4123 | previous_session_consumed_total); | |
4124 | } | |
4125 | latest_sample_result = | |
4126 | evaluate_session_consumed_size_condition( | |
4127 | condition, | |
4128 | latest_session_consumed_total); | |
4129 | break; | |
4130 | default: | |
4131 | /* Unknown condition type; internal error. */ | |
4132 | abort(); | |
4133 | } | |
ab0ee2ca JG |
4134 | |
4135 | if (!latest_sample_result || | |
4136 | (previous_sample_result == latest_sample_result)) { | |
4137 | /* | |
4138 | * Only trigger on a condition evaluation transition. | |
4139 | * | |
4140 | * NOTE: This edge-triggered logic may not be appropriate for | |
4141 | * future condition types. | |
4142 | */ | |
4143 | goto end; | |
4144 | } | |
4145 | ||
e8360425 JD |
4146 | if (!evaluation || !latest_sample_result) { |
4147 | goto end; | |
4148 | } | |
4149 | ||
4150 | switch (condition_type) { | |
4151 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4152 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
4153 | *evaluation = lttng_evaluation_buffer_usage_create( |
4154 | condition_type, | |
4155 | latest_sample->highest_usage, | |
e8360425 JD |
4156 | channel_info->capacity); |
4157 | break; | |
4158 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4159 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
4160 | latest_session_consumed_total); |
4161 | break; | |
4162 | default: | |
4163 | abort(); | |
4164 | } | |
4165 | ||
4166 | if (!*evaluation) { | |
4167 | ret = -1; | |
4168 | goto end; | |
ab0ee2ca JG |
4169 | } |
4170 | end: | |
4171 | return ret; | |
4172 | } | |
4173 | ||
4174 | static | |
f2b3ef9f | 4175 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4176 | { |
f2b3ef9f JG |
4177 | int ret = 0; |
4178 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 4179 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
4180 | }; |
4181 | ||
505b2d90 JG |
4182 | ASSERT_LOCKED(client->lock); |
4183 | ||
f2b3ef9f JG |
4184 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4185 | client->socket); | |
4186 | if (client->communication.outbound.dropped_notification) { | |
4187 | /* | |
4188 | * The client already has a "notification dropped" message | |
4189 | * in its outgoing queue. Nothing to do since all | |
4190 | * of those messages are coalesced. | |
4191 | */ | |
4192 | goto end; | |
4193 | } | |
4194 | ||
4195 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4196 | ret = lttng_dynamic_buffer_append( |
882093ee | 4197 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4198 | sizeof(msg)); |
f2b3ef9f JG |
4199 | if (ret) { |
4200 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4201 | client->socket); | |
4202 | } | |
4203 | end: | |
ab0ee2ca JG |
4204 | return ret; |
4205 | } | |
4206 | ||
f2b3ef9f JG |
4207 | static int client_handle_transmission_status_wrapper( |
4208 | struct notification_client *client, | |
4209 | enum client_transmission_status status, | |
4210 | void *user_data) | |
4211 | { | |
4212 | return client_handle_transmission_status(client, status, | |
4213 | (struct notification_thread_state *) user_data); | |
4214 | } | |
4215 | ||
4216 | static | |
4217 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4218 | const struct lttng_evaluation *evaluation, | |
4219 | struct notification_client_list* client_list, | |
4220 | struct notification_thread_state *state, | |
4221 | uid_t object_uid, gid_t object_gid) | |
4222 | { | |
ff588497 JR |
4223 | const struct lttng_credentials creds = { |
4224 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4225 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4226 | }; | |
4227 | ||
f2b3ef9f JG |
4228 | return notification_client_list_send_evaluation(client_list, |
4229 | lttng_trigger_get_const_condition(trigger), evaluation, | |
4230 | lttng_trigger_get_credentials(trigger), | |
ff588497 | 4231 | &creds, |
f2b3ef9f JG |
4232 | client_handle_transmission_status_wrapper, state); |
4233 | } | |
4234 | ||
f37d0f86 JG |
4235 | /* |
4236 | * Permission checks relative to notification channel clients are performed | |
4237 | * here. Notice how object, client, and trigger credentials are involved in | |
4238 | * this check. | |
4239 | * | |
4240 | * The `object` credentials are the credentials associated with the "subject" | |
4241 | * of a condition. For instance, a `rotation completed` condition applies | |
4242 | * to a session. When that condition is met, it will produce an evaluation | |
4243 | * against a session. Hence, in this case, the `object` credentials are the | |
4244 | * credentials of the "subject" session. | |
4245 | * | |
4246 | * The `trigger` credentials are the credentials of the user that registered the | |
4247 | * trigger. | |
4248 | * | |
4249 | * The `client` credentials are the credentials of the user that created a given | |
4250 | * notification channel. | |
4251 | * | |
4252 | * In terms of visibility, it is expected that non-privilieged users can only | |
4253 | * register triggers against "their" objects (their own sessions and | |
4254 | * applications they are allowed to interact with). They can then open a | |
4255 | * notification channel and subscribe to notifications associated with those | |
4256 | * triggers. | |
4257 | * | |
4258 | * As for privilieged users, they can register triggers against the objects of | |
4259 | * other users. They can then subscribe to the notifications associated to their | |
4260 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4261 | * triggers owned by other users; they must create their own triggers. | |
4262 | * | |
4263 | * This is more a concern of usability than security. It would be difficult for | |
4264 | * a root user reliably subscribe to a specific set of conditions without | |
4265 | * interference from external users (those could, for instance, unregister | |
4266 | * their triggers). | |
4267 | */ | |
f2b3ef9f JG |
4268 | LTTNG_HIDDEN |
4269 | int notification_client_list_send_evaluation( | |
4270 | struct notification_client_list *client_list, | |
4271 | const struct lttng_condition *condition, | |
9b63a4aa | 4272 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4273 | const struct lttng_credentials *trigger_creds, |
4274 | const struct lttng_credentials *source_object_creds, | |
4275 | report_client_transmission_result_cb client_report, | |
4276 | void *user_data) | |
ab0ee2ca JG |
4277 | { |
4278 | int ret = 0; | |
c0a66c84 | 4279 | struct lttng_payload msg_payload; |
ab0ee2ca | 4280 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4281 | const struct lttng_notification notification = { |
f2b3ef9f | 4282 | .condition = (struct lttng_condition *) condition, |
9b63a4aa JG |
4283 | .evaluation = (struct lttng_evaluation *) evaluation, |
4284 | }; | |
3647288f JG |
4285 | struct lttng_notification_channel_message msg_header = { |
4286 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
4287 | }; | |
ab0ee2ca | 4288 | |
c0a66c84 | 4289 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4290 | |
c0a66c84 | 4291 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4292 | sizeof(msg_header)); |
ab0ee2ca JG |
4293 | if (ret) { |
4294 | goto end; | |
4295 | } | |
4296 | ||
c0a66c84 | 4297 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4298 | if (ret) { |
ab0ee2ca JG |
4299 | ERR("[notification-thread] Failed to serialize notification"); |
4300 | ret = -1; | |
4301 | goto end; | |
4302 | } | |
4303 | ||
3647288f | 4304 | /* Update payload size. */ |
505b2d90 JG |
4305 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4306 | ->size = (uint32_t)( | |
4307 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4308 | |
882093ee JR |
4309 | /* Update the payload number of fds. */ |
4310 | { | |
4311 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4312 | &msg_payload, 0, -1); | |
4313 | ||
4314 | ((struct lttng_notification_channel_message *) | |
4315 | msg_payload.buffer.data)->fds = (uint32_t) | |
4316 | lttng_payload_view_get_fd_handle_count(&pv); | |
4317 | } | |
4318 | ||
505b2d90 | 4319 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
4320 | cds_list_for_each_entry_safe(client_list_element, tmp, |
4321 | &client_list->list, node) { | |
f2b3ef9f | 4322 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4323 | struct notification_client *client = |
4324 | client_list_element->client; | |
4325 | ||
505b2d90 JG |
4326 | ret = 0; |
4327 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4328 | if (!client->communication.active) { |
4329 | /* | |
4330 | * Skip inactive client (protocol error or | |
4331 | * disconnecting). | |
4332 | */ | |
4333 | DBG("Skipping client at it is marked as inactive"); | |
4334 | goto skip_client; | |
4335 | } | |
4336 | ||
f2b3ef9f | 4337 | if (source_object_creds) { |
ff588497 JR |
4338 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4339 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4340 | client->uid != 0) { |
4341 | /* | |
4342 | * Client is not allowed to monitor this | |
4343 | * object. | |
4344 | */ | |
4345 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
6c24d3fd | 4346 | goto skip_client; |
f2b3ef9f | 4347 | } |
90843f49 JR |
4348 | } |
4349 | ||
ff588497 | 4350 | if (client->uid != lttng_credentials_get_uid(trigger_creds) && client->gid != lttng_credentials_get_gid(trigger_creds)) { |
90843f49 | 4351 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4352 | goto skip_client; |
ab0ee2ca JG |
4353 | } |
4354 | ||
4355 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
c0a66c84 | 4356 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4357 | |
4358 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4359 | /* |
4360 | * Outgoing data is already buffered for this client; | |
4361 | * drop the notification and enqueue a "dropped | |
4362 | * notification" message if this is the first dropped | |
4363 | * notification since the socket spilled-over to the | |
4364 | * queue. | |
4365 | */ | |
f2b3ef9f JG |
4366 | ret = client_notification_overflow(client); |
4367 | if (ret) { | |
6c24d3fd JG |
4368 | /* Fatal error. */ |
4369 | goto skip_client; | |
ab0ee2ca | 4370 | } |
ab0ee2ca JG |
4371 | } |
4372 | ||
882093ee | 4373 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4374 | if (ret) { |
6c24d3fd JG |
4375 | /* Fatal error. */ |
4376 | goto skip_client; | |
ab0ee2ca JG |
4377 | } |
4378 | ||
f2b3ef9f | 4379 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4380 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4381 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4382 | if (ret) { |
6c24d3fd JG |
4383 | /* Fatal error. */ |
4384 | goto end_unlock_list; | |
505b2d90 | 4385 | } |
6c24d3fd JG |
4386 | |
4387 | continue; | |
4388 | ||
4389 | skip_client: | |
505b2d90 JG |
4390 | pthread_mutex_unlock(&client->lock); |
4391 | if (ret) { | |
6c24d3fd | 4392 | /* Fatal error. */ |
505b2d90 | 4393 | goto end_unlock_list; |
ab0ee2ca JG |
4394 | } |
4395 | } | |
4396 | ret = 0; | |
505b2d90 JG |
4397 | |
4398 | end_unlock_list: | |
4399 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4400 | end: |
c0a66c84 | 4401 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4402 | return ret; |
4403 | } | |
4404 | ||
8b524060 FD |
4405 | static |
4406 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4407 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4408 | { |
4409 | int ret; | |
b9a8d78f FD |
4410 | uint64_t token; |
4411 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4412 | char *capture_buffer = NULL; |
4413 | size_t capture_buffer_size; | |
94078603 JR |
4414 | void *reception_buffer; |
4415 | size_t reception_size; | |
4416 | ||
fc4b93fa | 4417 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
b9a8d78f | 4418 | struct lttng_kernel_event_notifier_notification kernel_notification; |
94078603 | 4419 | |
b9a8d78f | 4420 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4421 | switch(domain) { |
4422 | case LTTNG_DOMAIN_UST: | |
4423 | reception_buffer = (void *) &ust_notification; | |
4424 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4425 | break; |
4426 | case LTTNG_DOMAIN_KERNEL: | |
4427 | reception_buffer = (void *) &kernel_notification; | |
4428 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4429 | break; |
4430 | default: | |
4431 | abort(); | |
4432 | } | |
4433 | ||
4434 | /* | |
4435 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4436 | * ensuring that read/write of tracer notifications are atomic. | |
4437 | */ | |
4438 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4439 | reception_size); | |
4440 | if (ret != reception_size) { | |
4441 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4442 | notification_pipe_read_fd, reception_size, ret); | |
4443 | ret = -1; | |
4444 | goto end; | |
4445 | } | |
4446 | ||
4447 | switch(domain) { | |
4448 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4449 | token = ust_notification.token; |
82b3cbf4 | 4450 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4451 | break; |
4452 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4453 | token = kernel_notification.token; |
bbd6675c | 4454 | capture_buffer_size = kernel_notification.capture_buf_size; |
94078603 JR |
4455 | break; |
4456 | default: | |
4457 | abort(); | |
4458 | } | |
4459 | ||
82b3cbf4 JR |
4460 | if (capture_buffer_size == 0) { |
4461 | capture_buffer = NULL; | |
4462 | goto skip_capture; | |
4463 | } | |
4464 | ||
4465 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
4466 | 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", | |
4467 | capture_buffer_size, MAX_CAPTURE_SIZE); | |
4468 | goto end; | |
4469 | } | |
4470 | ||
4471 | capture_buffer = zmalloc(capture_buffer_size); | |
4472 | if (!capture_buffer) { | |
4473 | ERR("[notification-thread] Failed to allocate capture buffer"); | |
4474 | goto end; | |
4475 | } | |
4476 | ||
4477 | /* Fetch additional payload (capture). */ | |
4478 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4479 | if (ret != capture_buffer_size) { | |
4480 | ERR("[notification-thread] Failed to read from event source pipe (fd = %i)", | |
4481 | notification_pipe_read_fd); | |
4482 | goto end; | |
4483 | } | |
4484 | ||
4485 | skip_capture: | |
4486 | notification = lttng_event_notifier_notification_create(token, domain, | |
4487 | capture_buffer, capture_buffer_size); | |
4488 | if (notification == NULL) { | |
4489 | goto end; | |
4490 | } | |
4491 | ||
4492 | /* | |
4493 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4494 | */ | |
4495 | capture_buffer = NULL; | |
4496 | ||
b9a8d78f | 4497 | end: |
82b3cbf4 | 4498 | free(capture_buffer); |
b9a8d78f FD |
4499 | return notification; |
4500 | } | |
4501 | ||
8b524060 FD |
4502 | static |
4503 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4504 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4505 | { |
b9a8d78f FD |
4506 | struct cds_lfht_node *node; |
4507 | struct cds_lfht_iter iter; | |
4508 | struct notification_trigger_tokens_ht_element *element; | |
8b524060 | 4509 | enum lttng_trigger_status trigger_status; |
b9a8d78f | 4510 | struct lttng_evaluation *evaluation = NULL; |
b9a8d78f FD |
4511 | enum action_executor_status executor_status; |
4512 | struct notification_client_list *client_list = NULL; | |
4513 | const char *trigger_name; | |
8b524060 | 4514 | int ret; |
7c920b63 | 4515 | unsigned int capture_count = 0; |
b9a8d78f | 4516 | |
94078603 JR |
4517 | /* Find triggers associated with this token. */ |
4518 | rcu_read_lock(); | |
4519 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4520 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4521 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4522 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4523 | if (caa_unlikely(!node)) { |
94078603 | 4524 | /* |
f1446131 JR |
4525 | * This is not an error, slow consumption of the tracer |
4526 | * notifications can lead to situations where a trigger is | |
4527 | * removed but we still get tracer notifications matching a | |
4528 | * trigger that no longer exists. | |
94078603 JR |
4529 | */ |
4530 | ret = 0; | |
4531 | goto end_unlock; | |
4532 | } | |
4533 | ||
4534 | element = caa_container_of(node, | |
4535 | struct notification_trigger_tokens_ht_element, | |
4536 | node); | |
4537 | ||
f1446131 JR |
4538 | if (!lttng_trigger_should_fire(element->trigger)) { |
4539 | ret = 0; | |
4540 | goto end_unlock; | |
4541 | } | |
94078603 | 4542 | |
f1446131 | 4543 | lttng_trigger_fire(element->trigger); |
94078603 | 4544 | |
b9a8d78f FD |
4545 | trigger_status = lttng_trigger_get_name(element->trigger, &trigger_name); |
4546 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
4547 | ||
d602bd6a | 4548 | if (lttng_condition_on_event_get_capture_descriptor_count( |
7c920b63 PP |
4549 | lttng_trigger_get_const_condition(element->trigger), |
4550 | &capture_count) != LTTNG_CONDITION_STATUS_OK) { | |
4551 | ERR("Failed to get capture count"); | |
4552 | ret = -1; | |
4553 | goto end; | |
4554 | } | |
4555 | ||
4556 | if (!notification->capture_buffer && capture_count != 0) { | |
4557 | ERR("Expected capture but capture buffer is null"); | |
4558 | ret = -1; | |
4559 | goto end; | |
4560 | } | |
4561 | ||
d602bd6a | 4562 | evaluation = lttng_evaluation_on_event_create( |
7c920b63 PP |
4563 | container_of(lttng_trigger_get_const_condition( |
4564 | element->trigger), | |
d602bd6a | 4565 | struct lttng_condition_on_event, |
7c920b63 PP |
4566 | parent), |
4567 | trigger_name, | |
4568 | notification->capture_buffer, | |
4569 | notification->capture_buf_size, false); | |
4570 | ||
f1446131 | 4571 | if (evaluation == NULL) { |
b9a8d78f | 4572 | ERR("[notification-thread] Failed to create event rule hit evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4573 | ret = -1; |
4574 | goto end_unlock; | |
4575 | } | |
f1446131 JR |
4576 | client_list = get_client_list_from_condition(state, |
4577 | lttng_trigger_get_const_condition(element->trigger)); | |
4578 | executor_status = action_executor_enqueue(state->executor, | |
4579 | element->trigger, evaluation, NULL, client_list); | |
4580 | switch (executor_status) { | |
4581 | case ACTION_EXECUTOR_STATUS_OK: | |
4582 | ret = 0; | |
4583 | break; | |
4584 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4585 | { | |
4586 | struct notification_client_list_element *client_list_element, | |
4587 | *tmp; | |
4588 | ||
4589 | /* | |
4590 | * Not a fatal error; this is expected and simply means the | |
4591 | * executor has too much work queued already. | |
4592 | */ | |
4593 | ret = 0; | |
4594 | ||
4595 | /* No clients subscribed to notifications for this trigger. */ | |
4596 | if (!client_list) { | |
4597 | break; | |
4598 | } | |
4599 | ||
4600 | /* Warn clients that a notification (or more) was dropped. */ | |
4601 | pthread_mutex_lock(&client_list->lock); | |
4602 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
4603 | &client_list->list, node) { | |
4604 | enum client_transmission_status transmission_status; | |
4605 | struct notification_client *client = | |
4606 | client_list_element->client; | |
4607 | ||
4608 | pthread_mutex_lock(&client->lock); | |
4609 | ret = client_notification_overflow(client); | |
4610 | if (ret) { | |
4611 | /* Fatal error. */ | |
4612 | goto next_client; | |
4613 | } | |
4614 | ||
4615 | transmission_status = | |
4616 | client_flush_outgoing_queue(client); | |
4617 | ret = client_handle_transmission_status( | |
4618 | client, transmission_status, state); | |
4619 | if (ret) { | |
4620 | /* Fatal error. */ | |
4621 | goto next_client; | |
4622 | } | |
4623 | next_client: | |
4624 | pthread_mutex_unlock(&client->lock); | |
4625 | if (ret) { | |
4626 | break; | |
4627 | } | |
4628 | } | |
4629 | ||
4630 | pthread_mutex_unlock(&client_list->lock); | |
4631 | break; | |
4632 | } | |
98dfca79 | 4633 | case ACTION_EXECUTOR_STATUS_INVALID: |
f1446131 JR |
4634 | case ACTION_EXECUTOR_STATUS_ERROR: |
4635 | /* Fatal error, shut down everything. */ | |
4636 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4637 | ret = -1; | |
4638 | goto end_unlock; | |
4639 | default: | |
4640 | /* Unhandled error. */ | |
4641 | abort(); | |
4642 | } | |
94078603 JR |
4643 | |
4644 | end_unlock: | |
f1446131 | 4645 | notification_client_list_put(client_list); |
94078603 | 4646 | rcu_read_unlock(); |
7c920b63 | 4647 | end: |
8b524060 FD |
4648 | return ret; |
4649 | } | |
4650 | ||
4651 | static | |
4652 | int handle_one_event_notifier_notification( | |
4653 | struct notification_thread_state *state, | |
4654 | int pipe, enum lttng_domain_type domain) | |
4655 | { | |
82b3cbf4 | 4656 | int ret = 0; |
8b524060 FD |
4657 | struct lttng_event_notifier_notification *notification = NULL; |
4658 | ||
4659 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4660 | if (notification == NULL) { | |
82b3cbf4 | 4661 | /* Reception failed, don't consider it fatal. */ |
8b524060 FD |
4662 | ERR("[notification-thread] Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
4663 | pipe, lttng_domain_type_str(domain)); | |
8b524060 FD |
4664 | goto end; |
4665 | } | |
4666 | ||
4667 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4668 | if (ret) { | |
4669 | ERR("[notification-thread] Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", | |
4670 | pipe, lttng_domain_type_str(domain)); | |
4671 | goto end; | |
4672 | } | |
4673 | ||
94078603 | 4674 | end: |
8b524060 | 4675 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4676 | return ret; |
4677 | } | |
4678 | ||
8b524060 FD |
4679 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4680 | int pipe, enum lttng_domain_type domain) | |
4681 | { | |
4682 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4683 | } | |
4684 | ||
ab0ee2ca JG |
4685 | int handle_notification_thread_channel_sample( |
4686 | struct notification_thread_state *state, int pipe, | |
4687 | enum lttng_domain_type domain) | |
4688 | { | |
4689 | int ret = 0; | |
4690 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4691 | struct channel_info *channel_info; |
4692 | struct cds_lfht_node *node; | |
4693 | struct cds_lfht_iter iter; | |
4694 | struct lttng_channel_trigger_list *trigger_list; | |
4695 | struct lttng_trigger_list_element *trigger_list_element; | |
4696 | bool previous_sample_available = false; | |
e8360425 JD |
4697 | struct channel_state_sample previous_sample, latest_sample; |
4698 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4699 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4700 | |
4701 | /* | |
4702 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4703 | * ensuring that read/write of sampling messages are atomic. | |
4704 | */ | |
7c2551ef | 4705 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
4706 | if (ret != sizeof(sample_msg)) { |
4707 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
4708 | pipe); | |
4709 | ret = -1; | |
4710 | goto end; | |
4711 | } | |
4712 | ||
4713 | ret = 0; | |
4714 | latest_sample.key.key = sample_msg.key; | |
4715 | latest_sample.key.domain = domain; | |
4716 | latest_sample.highest_usage = sample_msg.highest; | |
4717 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4718 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4719 | |
4720 | rcu_read_lock(); | |
4721 | ||
4722 | /* Retrieve the channel's informations */ | |
4723 | cds_lfht_lookup(state->channels_ht, | |
4724 | hash_channel_key(&latest_sample.key), | |
4725 | match_channel_info, | |
4726 | &latest_sample.key, | |
4727 | &iter); | |
4728 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4729 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4730 | /* |
4731 | * Not an error since the consumer can push a sample to the pipe | |
4732 | * and the rest of the session daemon could notify us of the | |
4733 | * channel's destruction before we get a chance to process that | |
4734 | * sample. | |
4735 | */ | |
4736 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
4737 | latest_sample.key.key, | |
526200e4 | 4738 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4739 | goto end_unlock; |
4740 | } | |
4741 | channel_info = caa_container_of(node, struct channel_info, | |
4742 | channels_ht_node); | |
e8360425 | 4743 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4744 | channel_info->name, |
ab0ee2ca | 4745 | latest_sample.key.key, |
8abe313a | 4746 | channel_info->session_info->name, |
ab0ee2ca | 4747 | latest_sample.highest_usage, |
e8360425 JD |
4748 | latest_sample.lowest_usage, |
4749 | latest_sample.channel_total_consumed); | |
4750 | ||
4751 | previous_session_consumed_total = | |
4752 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4753 | |
4754 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4755 | cds_lfht_lookup(state->channel_state_ht, | |
4756 | hash_channel_key(&latest_sample.key), | |
4757 | match_channel_state_sample, | |
4758 | &latest_sample.key, | |
4759 | &iter); | |
4760 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4761 | if (caa_likely(node)) { |
ab0ee2ca JG |
4762 | struct channel_state_sample *stored_sample; |
4763 | ||
4764 | /* Update the sample stored. */ | |
4765 | stored_sample = caa_container_of(node, | |
4766 | struct channel_state_sample, | |
4767 | channel_state_ht_node); | |
e8360425 | 4768 | |
ab0ee2ca JG |
4769 | memcpy(&previous_sample, stored_sample, |
4770 | sizeof(previous_sample)); | |
4771 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4772 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4773 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4774 | previous_sample_available = true; |
e8360425 JD |
4775 | |
4776 | latest_session_consumed_total = | |
4777 | previous_session_consumed_total + | |
4778 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4779 | } else { |
4780 | /* | |
4781 | * This is the channel's first sample, allocate space for and | |
4782 | * store the new sample. | |
4783 | */ | |
4784 | struct channel_state_sample *stored_sample; | |
4785 | ||
4786 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4787 | if (!stored_sample) { | |
4788 | ret = -1; | |
4789 | goto end_unlock; | |
4790 | } | |
4791 | ||
4792 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4793 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4794 | cds_lfht_add(state->channel_state_ht, | |
4795 | hash_channel_key(&stored_sample->key), | |
4796 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4797 | |
4798 | latest_session_consumed_total = | |
4799 | previous_session_consumed_total + | |
4800 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4801 | } |
4802 | ||
e8360425 JD |
4803 | channel_info->session_info->consumed_data_size = |
4804 | latest_session_consumed_total; | |
4805 | ||
ab0ee2ca JG |
4806 | /* Find triggers associated with this channel. */ |
4807 | cds_lfht_lookup(state->channel_triggers_ht, | |
4808 | hash_channel_key(&latest_sample.key), | |
4809 | match_channel_trigger_list, | |
4810 | &latest_sample.key, | |
4811 | &iter); | |
4812 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4813 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4814 | goto end_unlock; |
4815 | } | |
4816 | ||
f2b3ef9f | 4817 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4818 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4819 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4820 | }; |
4821 | ||
ab0ee2ca JG |
4822 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4823 | channel_triggers_ht_node); | |
4824 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4825 | node) { |
9b63a4aa | 4826 | const struct lttng_condition *condition; |
f2b3ef9f | 4827 | struct lttng_trigger *trigger; |
505b2d90 | 4828 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4829 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4830 | enum action_executor_status executor_status; |
ab0ee2ca | 4831 | |
505b2d90 | 4832 | ret = 0; |
ab0ee2ca | 4833 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4834 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 4835 | assert(condition); |
ab0ee2ca JG |
4836 | |
4837 | /* | |
4838 | * Check if any client is subscribed to the result of this | |
4839 | * evaluation. | |
4840 | */ | |
ed327204 | 4841 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4842 | |
ed327204 | 4843 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4844 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4845 | &latest_sample, |
4846 | previous_session_consumed_total, | |
4847 | latest_session_consumed_total, | |
4848 | channel_info); | |
4849 | if (caa_unlikely(ret)) { | |
505b2d90 | 4850 | goto put_list; |
ab0ee2ca JG |
4851 | } |
4852 | ||
e8360425 | 4853 | if (caa_likely(!evaluation)) { |
505b2d90 | 4854 | goto put_list; |
ab0ee2ca JG |
4855 | } |
4856 | ||
f8522f5c JR |
4857 | if (!lttng_trigger_should_fire(trigger)) { |
4858 | goto put_list; | |
4859 | } | |
4860 | ||
4861 | lttng_trigger_fire(trigger); | |
4862 | ||
f2b3ef9f JG |
4863 | /* |
4864 | * Ownership of `evaluation` transferred to the action executor | |
4865 | * no matter the result. | |
4866 | */ | |
4867 | executor_status = action_executor_enqueue(state->executor, | |
4868 | trigger, evaluation, &channel_creds, | |
4869 | client_list); | |
4870 | evaluation = NULL; | |
4871 | switch (executor_status) { | |
4872 | case ACTION_EXECUTOR_STATUS_OK: | |
4873 | break; | |
4874 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4875 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4876 | /* | |
4877 | * TODO Add trigger identification (name/id) when | |
4878 | * it is added to the API. | |
4879 | */ | |
4880 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4881 | ret = -1; | |
4882 | goto put_list; | |
4883 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4884 | /* | |
4885 | * TODO Add trigger identification (name/id) when | |
4886 | * it is added to the API. | |
4887 | * | |
4888 | * Not a fatal error. | |
4889 | */ | |
4890 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4891 | ret = 0; | |
4892 | goto put_list; | |
4893 | default: | |
4894 | abort(); | |
4895 | } | |
4896 | ||
505b2d90 JG |
4897 | put_list: |
4898 | notification_client_list_put(client_list); | |
e0b5f87b | 4899 | if (caa_unlikely(ret)) { |
505b2d90 | 4900 | break; |
ab0ee2ca JG |
4901 | } |
4902 | } | |
4903 | end_unlock: | |
4904 | rcu_read_unlock(); | |
4905 | end: | |
4906 | return ret; | |
4907 | } |