Commit | Line | Data |
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ab0ee2ca | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
ab0ee2ca | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
ab0ee2ca | 5 | * |
ab0ee2ca JG |
6 | */ |
7 | ||
f2b3ef9f JG |
8 | #include "lttng/action/action.h" |
9 | #include "lttng/trigger/trigger-internal.h" | |
ab0ee2ca JG |
10 | #define _LGPL_SOURCE |
11 | #include <urcu.h> | |
12 | #include <urcu/rculfhash.h> | |
13 | ||
ab0ee2ca JG |
14 | #include <common/defaults.h> |
15 | #include <common/error.h> | |
16 | #include <common/futex.h> | |
17 | #include <common/unix.h> | |
18 | #include <common/dynamic-buffer.h> | |
19 | #include <common/hashtable/utils.h> | |
20 | #include <common/sessiond-comm/sessiond-comm.h> | |
21 | #include <common/macros.h> | |
22 | #include <lttng/condition/condition.h> | |
9b63a4aa | 23 | #include <lttng/action/action-internal.h> |
ad63a966 | 24 | #include <lttng/action/list-internal.h> |
93ac2c44 | 25 | #include <lttng/domain-internal.h> |
ab0ee2ca JG |
26 | #include <lttng/notification/notification-internal.h> |
27 | #include <lttng/condition/condition-internal.h> | |
28 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 29 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 30 | #include <lttng/condition/session-rotation-internal.h> |
670a26e4 | 31 | #include <lttng/condition/event-rule-matches-internal.h> |
d02d7404 | 32 | #include <lttng/domain-internal.h> |
ab0ee2ca | 33 | #include <lttng/notification/channel-internal.h> |
85c06c44 | 34 | #include <lttng/trigger/trigger-internal.h> |
959e3c66 | 35 | #include <lttng/event-rule/event-rule-internal.h> |
1da26331 | 36 | |
ab0ee2ca JG |
37 | #include <time.h> |
38 | #include <unistd.h> | |
ab0ee2ca | 39 | #include <inttypes.h> |
d53ea4e4 | 40 | #include <fcntl.h> |
ab0ee2ca | 41 | |
e98a976a | 42 | #include "condition-internal.h" |
90aa04a1 | 43 | #include "event-notifier-error-accounting.h" |
1da26331 JG |
44 | #include "notification-thread.h" |
45 | #include "notification-thread-events.h" | |
46 | #include "notification-thread-commands.h" | |
47 | #include "lttng-sessiond.h" | |
48 | #include "kernel.h" | |
49 | ||
ab0ee2ca JG |
50 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
51 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
52 | ||
82b3cbf4 JR |
53 | /* The tracers currently limit the capture size to PIPE_BUF (4kb on linux). */ |
54 | #define MAX_CAPTURE_SIZE (PIPE_BUF) | |
55 | ||
51eab943 JG |
56 | enum lttng_object_type { |
57 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
58 | LTTNG_OBJECT_TYPE_NONE, | |
59 | LTTNG_OBJECT_TYPE_CHANNEL, | |
60 | LTTNG_OBJECT_TYPE_SESSION, | |
61 | }; | |
62 | ||
ab0ee2ca | 63 | struct lttng_trigger_list_element { |
9e0bb80e | 64 | /* No ownership of the trigger object is assumed. */ |
f2b3ef9f | 65 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
66 | struct cds_list_head node; |
67 | }; | |
68 | ||
69 | struct lttng_channel_trigger_list { | |
70 | struct channel_key channel_key; | |
ea9a44f0 | 71 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 72 | struct cds_list_head list; |
ea9a44f0 | 73 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 74 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
75 | /* call_rcu delayed reclaim. */ |
76 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
77 | }; |
78 | ||
ea9a44f0 JG |
79 | /* |
80 | * List of triggers applying to a given session. | |
81 | * | |
82 | * See: | |
83 | * - lttng_session_trigger_list_create() | |
84 | * - lttng_session_trigger_list_build() | |
85 | * - lttng_session_trigger_list_destroy() | |
86 | * - lttng_session_trigger_list_add() | |
87 | */ | |
88 | struct lttng_session_trigger_list { | |
89 | /* | |
90 | * Not owned by this; points to the session_info structure's | |
91 | * session name. | |
92 | */ | |
93 | const char *session_name; | |
94 | /* List of struct lttng_trigger_list_element. */ | |
95 | struct cds_list_head list; | |
96 | /* Node in the session_triggers_ht */ | |
97 | struct cds_lfht_node session_triggers_ht_node; | |
98 | /* | |
99 | * Weak reference to the notification system's session triggers | |
100 | * hashtable. | |
101 | * | |
102 | * The session trigger list structure structure is owned by | |
103 | * the session's session_info. | |
104 | * | |
105 | * The session_info is kept alive the the channel_infos holding a | |
106 | * reference to it (reference counting). When those channels are | |
107 | * destroyed (at runtime or on teardown), the reference they hold | |
108 | * to the session_info are released. On destruction of session_info, | |
109 | * session_info_destroy() will remove the list of triggers applying | |
110 | * to this session from the notification system's state. | |
111 | * | |
112 | * This implies that the session_triggers_ht must be destroyed | |
113 | * after the channels. | |
114 | */ | |
115 | struct cds_lfht *session_triggers_ht; | |
116 | /* Used for delayed RCU reclaim. */ | |
117 | struct rcu_head rcu_node; | |
118 | }; | |
119 | ||
ab0ee2ca JG |
120 | struct lttng_trigger_ht_element { |
121 | struct lttng_trigger *trigger; | |
122 | struct cds_lfht_node node; | |
242388e4 | 123 | struct cds_lfht_node node_by_name_uid; |
091fa780 | 124 | struct cds_list_head client_list_trigger_node; |
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 | 312 | |
a0377dfe | 313 | LTTNG_ASSERT(condition_key); |
ab0ee2ca JG |
314 | |
315 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 316 | notification_trigger_clients_ht_node); |
091fa780 | 317 | condition = client_list->condition; |
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"; | |
8790759c FD |
355 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
356 | return "GET_TRIGGER"; | |
6900ae81 FD |
357 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
358 | return "QUIT"; | |
359 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: | |
360 | return "CLIENT_COMMUNICATION_UPDATE"; | |
361 | default: | |
362 | abort(); | |
363 | } | |
364 | } | |
365 | ||
242388e4 JR |
366 | /* |
367 | * Match trigger based on name and credentials only. | |
368 | * Name duplication is NOT allowed for the same uid. | |
369 | */ | |
370 | static | |
371 | int match_trigger_by_name_uid(struct cds_lfht_node *node, | |
372 | const void *key) | |
373 | { | |
374 | bool match = false; | |
0efb2ad7 | 375 | const char *element_trigger_name; |
242388e4 JR |
376 | const char *key_name; |
377 | enum lttng_trigger_status status; | |
378 | const struct lttng_credentials *key_creds; | |
379 | const struct lttng_credentials *node_creds; | |
380 | const struct lttng_trigger *trigger_key = | |
381 | (const struct lttng_trigger *) key; | |
382 | const struct lttng_trigger_ht_element *trigger_ht_element = | |
383 | caa_container_of(node, | |
384 | struct lttng_trigger_ht_element, | |
385 | node_by_name_uid); | |
386 | ||
0efb2ad7 JG |
387 | status = lttng_trigger_get_name(trigger_ht_element->trigger, |
388 | &element_trigger_name); | |
389 | element_trigger_name = status == LTTNG_TRIGGER_STATUS_OK ? | |
390 | element_trigger_name : NULL; | |
242388e4 JR |
391 | |
392 | status = lttng_trigger_get_name(trigger_key, &key_name); | |
0efb2ad7 | 393 | key_name = status == LTTNG_TRIGGER_STATUS_OK ? key_name : NULL; |
242388e4 | 394 | |
0efb2ad7 JG |
395 | /* |
396 | * Compare the names. | |
397 | * Consider null names as not equal. This is to maintain backwards | |
398 | * compatibility with pre-2.13 anonymous triggers. Multiples anonymous | |
399 | * triggers are allowed for a given user. | |
400 | */ | |
401 | if (!element_trigger_name || !key_name) { | |
402 | goto end; | |
403 | } | |
404 | ||
405 | if (strcmp(element_trigger_name, key_name) != 0) { | |
242388e4 JR |
406 | goto end; |
407 | } | |
408 | ||
409 | /* Compare the owners' UIDs. */ | |
410 | key_creds = lttng_trigger_get_credentials(trigger_key); | |
411 | node_creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
412 | ||
413 | match = lttng_credentials_is_equal_uid(key_creds, node_creds); | |
414 | ||
415 | end: | |
416 | return match; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Hash trigger based on name and credentials only. | |
421 | */ | |
422 | static | |
423 | unsigned long hash_trigger_by_name_uid(const struct lttng_trigger *trigger) | |
424 | { | |
425 | unsigned long hash = 0; | |
426 | const struct lttng_credentials *trigger_creds; | |
427 | const char *trigger_name; | |
428 | enum lttng_trigger_status status; | |
429 | ||
430 | status = lttng_trigger_get_name(trigger, &trigger_name); | |
431 | if (status == LTTNG_TRIGGER_STATUS_OK) { | |
432 | hash = hash_key_str(trigger_name, lttng_ht_seed); | |
433 | } | |
434 | ||
435 | trigger_creds = lttng_trigger_get_credentials(trigger); | |
436 | hash ^= hash_key_ulong((void *) (unsigned long) LTTNG_OPTIONAL_GET(trigger_creds->uid), | |
437 | lttng_ht_seed); | |
438 | ||
439 | return hash; | |
440 | } | |
441 | ||
e4db5ace JR |
442 | static |
443 | unsigned long hash_channel_key(struct channel_key *key) | |
444 | { | |
445 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
446 | unsigned long domain_hash = hash_key_ulong( | |
447 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
448 | ||
449 | return key_hash ^ domain_hash; | |
450 | } | |
451 | ||
ac1889bf JG |
452 | static |
453 | unsigned long hash_client_socket(int socket) | |
454 | { | |
455 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
456 | } | |
457 | ||
458 | static | |
459 | unsigned long hash_client_id(notification_client_id id) | |
460 | { | |
461 | return hash_key_u64(&id, lttng_ht_seed); | |
462 | } | |
463 | ||
f82f93a1 JG |
464 | /* |
465 | * Get the type of object to which a given condition applies. Bindings let | |
466 | * the notification system evaluate a trigger's condition when a given | |
467 | * object's state is updated. | |
468 | * | |
469 | * For instance, a condition bound to a channel will be evaluated everytime | |
470 | * the channel's state is changed by a channel monitoring sample. | |
471 | */ | |
472 | static | |
473 | enum lttng_object_type get_condition_binding_object( | |
474 | const struct lttng_condition *condition) | |
475 | { | |
476 | switch (lttng_condition_get_type(condition)) { | |
477 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
478 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
479 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 480 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
481 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
482 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
483 | return LTTNG_OBJECT_TYPE_SESSION; | |
8dbb86b8 | 484 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 | 485 | return LTTNG_OBJECT_TYPE_NONE; |
f82f93a1 JG |
486 | default: |
487 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
488 | } | |
489 | } | |
490 | ||
83b934ad MD |
491 | static |
492 | void free_channel_info_rcu(struct rcu_head *node) | |
493 | { | |
494 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
495 | } | |
496 | ||
ab0ee2ca JG |
497 | static |
498 | void channel_info_destroy(struct channel_info *channel_info) | |
499 | { | |
500 | if (!channel_info) { | |
501 | return; | |
502 | } | |
503 | ||
8abe313a JG |
504 | if (channel_info->session_info) { |
505 | session_info_remove_channel(channel_info->session_info, | |
506 | channel_info); | |
507 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 508 | } |
8abe313a JG |
509 | if (channel_info->name) { |
510 | free(channel_info->name); | |
ab0ee2ca | 511 | } |
83b934ad MD |
512 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
513 | } | |
514 | ||
515 | static | |
516 | void free_session_info_rcu(struct rcu_head *node) | |
517 | { | |
518 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
519 | } |
520 | ||
8abe313a | 521 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 522 | static |
8abe313a | 523 | void session_info_destroy(void *_data) |
ab0ee2ca | 524 | { |
8abe313a | 525 | struct session_info *session_info = _data; |
3b68d0a3 | 526 | int ret; |
ab0ee2ca | 527 | |
a0377dfe | 528 | LTTNG_ASSERT(session_info); |
8abe313a | 529 | if (session_info->channel_infos_ht) { |
3b68d0a3 JR |
530 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
531 | if (ret) { | |
bd0514a5 | 532 | ERR("Failed to destroy channel information hash table"); |
3b68d0a3 | 533 | } |
8abe313a | 534 | } |
ea9a44f0 | 535 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
536 | |
537 | rcu_read_lock(); | |
538 | cds_lfht_del(session_info->sessions_ht, | |
539 | &session_info->sessions_ht_node); | |
540 | rcu_read_unlock(); | |
8abe313a | 541 | free(session_info->name); |
83b934ad | 542 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 543 | } |
ab0ee2ca | 544 | |
8abe313a JG |
545 | static |
546 | void session_info_get(struct session_info *session_info) | |
547 | { | |
548 | if (!session_info) { | |
549 | return; | |
550 | } | |
551 | lttng_ref_get(&session_info->ref); | |
552 | } | |
553 | ||
554 | static | |
555 | void session_info_put(struct session_info *session_info) | |
556 | { | |
557 | if (!session_info) { | |
558 | return; | |
ab0ee2ca | 559 | } |
8abe313a JG |
560 | lttng_ref_put(&session_info->ref); |
561 | } | |
562 | ||
563 | static | |
ea9a44f0 | 564 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
565 | struct lttng_session_trigger_list *trigger_list, |
566 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
567 | { |
568 | struct session_info *session_info; | |
ab0ee2ca | 569 | |
a0377dfe | 570 | LTTNG_ASSERT(name); |
ab0ee2ca | 571 | |
8abe313a JG |
572 | session_info = zmalloc(sizeof(*session_info)); |
573 | if (!session_info) { | |
574 | goto end; | |
575 | } | |
576 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
577 | ||
578 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
579 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
580 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
581 | goto error; |
582 | } | |
8abe313a JG |
583 | |
584 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
585 | session_info->name = strdup(name); | |
586 | if (!session_info->name) { | |
ab0ee2ca JG |
587 | goto error; |
588 | } | |
8abe313a JG |
589 | session_info->uid = uid; |
590 | session_info->gid = gid; | |
ea9a44f0 | 591 | session_info->trigger_list = trigger_list; |
1eee26c5 | 592 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
593 | end: |
594 | return session_info; | |
595 | error: | |
596 | session_info_put(session_info); | |
597 | return NULL; | |
598 | } | |
599 | ||
600 | static | |
601 | void session_info_add_channel(struct session_info *session_info, | |
602 | struct channel_info *channel_info) | |
603 | { | |
604 | rcu_read_lock(); | |
605 | cds_lfht_add(session_info->channel_infos_ht, | |
606 | hash_channel_key(&channel_info->key), | |
607 | &channel_info->session_info_channels_ht_node); | |
608 | rcu_read_unlock(); | |
609 | } | |
610 | ||
611 | static | |
612 | void session_info_remove_channel(struct session_info *session_info, | |
613 | struct channel_info *channel_info) | |
614 | { | |
615 | rcu_read_lock(); | |
616 | cds_lfht_del(session_info->channel_infos_ht, | |
617 | &channel_info->session_info_channels_ht_node); | |
618 | rcu_read_unlock(); | |
619 | } | |
620 | ||
621 | static | |
622 | struct channel_info *channel_info_create(const char *channel_name, | |
623 | struct channel_key *channel_key, uint64_t channel_capacity, | |
624 | struct session_info *session_info) | |
625 | { | |
626 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
627 | ||
628 | if (!channel_info) { | |
629 | goto end; | |
630 | } | |
631 | ||
ab0ee2ca | 632 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
633 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
634 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
635 | channel_info->capacity = channel_capacity; | |
636 | ||
637 | channel_info->name = strdup(channel_name); | |
638 | if (!channel_info->name) { | |
639 | goto error; | |
640 | } | |
641 | ||
642 | /* | |
643 | * Set the references between session and channel infos: | |
644 | * - channel_info holds a strong reference to session_info | |
645 | * - session_info holds a weak reference to channel_info | |
646 | */ | |
647 | session_info_get(session_info); | |
648 | session_info_add_channel(session_info, channel_info); | |
649 | channel_info->session_info = session_info; | |
ab0ee2ca | 650 | end: |
8abe313a | 651 | return channel_info; |
ab0ee2ca | 652 | error: |
8abe313a | 653 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
654 | return NULL; |
655 | } | |
656 | ||
f2b3ef9f | 657 | LTTNG_HIDDEN |
505b2d90 JG |
658 | bool notification_client_list_get(struct notification_client_list *list) |
659 | { | |
660 | return urcu_ref_get_unless_zero(&list->ref); | |
661 | } | |
662 | ||
663 | static | |
664 | void free_notification_client_list_rcu(struct rcu_head *node) | |
665 | { | |
666 | free(caa_container_of(node, struct notification_client_list, | |
667 | rcu_node)); | |
668 | } | |
669 | ||
670 | static | |
671 | void notification_client_list_release(struct urcu_ref *list_ref) | |
672 | { | |
673 | struct notification_client_list *list = | |
674 | container_of(list_ref, typeof(*list), ref); | |
675 | struct notification_client_list_element *client_list_element, *tmp; | |
676 | ||
091fa780 FD |
677 | lttng_condition_put(list->condition); |
678 | ||
505b2d90 JG |
679 | if (list->notification_trigger_clients_ht) { |
680 | rcu_read_lock(); | |
091fa780 | 681 | |
505b2d90 JG |
682 | cds_lfht_del(list->notification_trigger_clients_ht, |
683 | &list->notification_trigger_clients_ht_node); | |
684 | rcu_read_unlock(); | |
685 | list->notification_trigger_clients_ht = NULL; | |
686 | } | |
687 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 688 | &list->clients_list, node) { |
505b2d90 JG |
689 | free(client_list_element); |
690 | } | |
091fa780 | 691 | |
a0377dfe | 692 | LTTNG_ASSERT(cds_list_empty(&list->triggers_list)); |
091fa780 | 693 | |
505b2d90 JG |
694 | pthread_mutex_destroy(&list->lock); |
695 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
696 | } | |
697 | ||
091fa780 FD |
698 | static |
699 | bool condition_applies_to_client(const struct lttng_condition *condition, | |
700 | struct notification_client *client) | |
701 | { | |
702 | bool applies = false; | |
703 | struct lttng_condition_list_element *condition_list_element; | |
704 | ||
705 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
706 | node) { | |
707 | applies = lttng_condition_is_equal( | |
708 | condition_list_element->condition, | |
709 | condition); | |
710 | if (applies) { | |
711 | break; | |
712 | } | |
713 | } | |
714 | ||
715 | return applies; | |
716 | } | |
717 | ||
505b2d90 JG |
718 | static |
719 | struct notification_client_list *notification_client_list_create( | |
091fa780 FD |
720 | struct notification_thread_state *state, |
721 | const struct lttng_condition *condition) | |
505b2d90 | 722 | { |
091fa780 FD |
723 | struct notification_client *client; |
724 | struct cds_lfht_iter iter; | |
725 | struct notification_client_list *client_list; | |
505b2d90 | 726 | |
091fa780 | 727 | client_list = zmalloc(sizeof(*client_list)); |
505b2d90 | 728 | if (!client_list) { |
091fa780 FD |
729 | PERROR("Failed to allocate notification client list"); |
730 | goto end; | |
505b2d90 | 731 | } |
091fa780 | 732 | |
505b2d90 | 733 | pthread_mutex_init(&client_list->lock, NULL); |
091fa780 FD |
734 | /* |
735 | * The trigger that owns the condition has the first reference to this | |
736 | * client list. | |
737 | */ | |
505b2d90 JG |
738 | urcu_ref_init(&client_list->ref); |
739 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
091fa780 FD |
740 | CDS_INIT_LIST_HEAD(&client_list->clients_list); |
741 | CDS_INIT_LIST_HEAD(&client_list->triggers_list); | |
505b2d90 | 742 | |
091fa780 FD |
743 | /* |
744 | * Create a copy of the condition so that it's independent of any | |
745 | * trigger. The client list may outlive the trigger object (which owns | |
746 | * the condition) that is used to create it. | |
747 | */ | |
748 | client_list->condition = lttng_condition_copy(condition); | |
749 | ||
750 | /* Build a list of clients to which this new condition applies. */ | |
751 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
752 | client_socket_ht_node) { | |
753 | struct notification_client_list_element *client_list_element; | |
505b2d90 | 754 | |
091fa780 FD |
755 | if (!condition_applies_to_client(condition, client)) { |
756 | continue; | |
757 | } | |
758 | ||
759 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
760 | if (!client_list_element) { | |
761 | goto error_put_client_list; | |
762 | } | |
505b2d90 | 763 | |
091fa780 FD |
764 | CDS_INIT_LIST_HEAD(&client_list_element->node); |
765 | client_list_element->client = client; | |
766 | cds_list_add(&client_list_element->node, &client_list->clients_list); | |
767 | } | |
768 | ||
769 | client_list->notification_trigger_clients_ht = | |
505b2d90 JG |
770 | state->notification_trigger_clients_ht; |
771 | ||
772 | rcu_read_lock(); | |
091fa780 FD |
773 | /* |
774 | * Add the client list to the global list of client list. | |
775 | */ | |
776 | cds_lfht_add_unique(state->notification_trigger_clients_ht, | |
777 | lttng_condition_hash(client_list->condition), | |
778 | match_client_list_condition, | |
779 | client_list->condition, | |
780 | &client_list->notification_trigger_clients_ht_node); | |
505b2d90 | 781 | rcu_read_unlock(); |
091fa780 FD |
782 | goto end; |
783 | ||
784 | error_put_client_list: | |
785 | notification_client_list_put(client_list); | |
786 | client_list = NULL; | |
787 | ||
788 | end: | |
789 | return client_list; | |
505b2d90 JG |
790 | } |
791 | ||
505b2d90 JG |
792 | void notification_client_list_put(struct notification_client_list *list) |
793 | { | |
794 | if (!list) { | |
795 | return; | |
796 | } | |
797 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
798 | } | |
799 | ||
800 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
801 | static |
802 | struct notification_client_list *get_client_list_from_condition( | |
803 | struct notification_thread_state *state, | |
804 | const struct lttng_condition *condition) | |
805 | { | |
806 | struct cds_lfht_node *node; | |
807 | struct cds_lfht_iter iter; | |
505b2d90 | 808 | struct notification_client_list *list = NULL; |
ed327204 | 809 | |
505b2d90 | 810 | rcu_read_lock(); |
ed327204 JG |
811 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
812 | lttng_condition_hash(condition), | |
813 | match_client_list_condition, | |
814 | condition, | |
815 | &iter); | |
816 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
817 | if (node) { |
818 | list = container_of(node, struct notification_client_list, | |
819 | notification_trigger_clients_ht_node); | |
820 | list = notification_client_list_get(list) ? list : NULL; | |
821 | } | |
ed327204 | 822 | |
505b2d90 JG |
823 | rcu_read_unlock(); |
824 | return list; | |
ed327204 JG |
825 | } |
826 | ||
e4db5ace | 827 | static |
f82f93a1 JG |
828 | int evaluate_channel_condition_for_client( |
829 | const struct lttng_condition *condition, | |
830 | struct notification_thread_state *state, | |
831 | struct lttng_evaluation **evaluation, | |
832 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
833 | { |
834 | int ret; | |
835 | struct cds_lfht_iter iter; | |
836 | struct cds_lfht_node *node; | |
837 | struct channel_info *channel_info = NULL; | |
838 | struct channel_key *channel_key = NULL; | |
839 | struct channel_state_sample *last_sample = NULL; | |
840 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 841 | |
505b2d90 JG |
842 | rcu_read_lock(); |
843 | ||
f82f93a1 | 844 | /* Find the channel associated with the condition. */ |
e4db5ace | 845 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 846 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
847 | struct lttng_trigger_list_element *element; |
848 | ||
849 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 850 | const struct lttng_condition *current_condition = |
f82f93a1 | 851 | lttng_trigger_get_const_condition( |
e4db5ace JR |
852 | element->trigger); |
853 | ||
a0377dfe | 854 | LTTNG_ASSERT(current_condition); |
e4db5ace | 855 | if (!lttng_condition_is_equal(condition, |
2ae99f0b | 856 | current_condition)) { |
e4db5ace JR |
857 | continue; |
858 | } | |
859 | ||
860 | /* Found the trigger, save the channel key. */ | |
861 | channel_key = &channel_trigger_list->channel_key; | |
862 | break; | |
863 | } | |
864 | if (channel_key) { | |
865 | /* The channel key was found stop iteration. */ | |
866 | break; | |
867 | } | |
868 | } | |
869 | ||
870 | if (!channel_key){ | |
871 | /* No channel found; normal exit. */ | |
bd0514a5 | 872 | DBG("No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
873 | ret = 0; |
874 | goto end; | |
875 | } | |
876 | ||
877 | /* Fetch channel info for the matching channel. */ | |
878 | cds_lfht_lookup(state->channels_ht, | |
879 | hash_channel_key(channel_key), | |
880 | match_channel_info, | |
881 | channel_key, | |
882 | &iter); | |
883 | node = cds_lfht_iter_get_node(&iter); | |
a0377dfe | 884 | LTTNG_ASSERT(node); |
e4db5ace JR |
885 | channel_info = caa_container_of(node, struct channel_info, |
886 | channels_ht_node); | |
887 | ||
888 | /* Retrieve the channel's last sample, if it exists. */ | |
889 | cds_lfht_lookup(state->channel_state_ht, | |
890 | hash_channel_key(channel_key), | |
891 | match_channel_state_sample, | |
892 | channel_key, | |
893 | &iter); | |
894 | node = cds_lfht_iter_get_node(&iter); | |
895 | if (node) { | |
896 | last_sample = caa_container_of(node, | |
897 | struct channel_state_sample, | |
898 | channel_state_ht_node); | |
899 | } else { | |
900 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
bd0514a5 | 901 | DBG("No channel sample associated with newly subscribed-to condition"); |
e4db5ace JR |
902 | ret = 0; |
903 | goto end; | |
904 | } | |
905 | ||
f82f93a1 | 906 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
907 | NULL, last_sample, |
908 | 0, channel_info->session_info->consumed_data_size, | |
909 | channel_info); | |
e4db5ace | 910 | if (ret) { |
bd0514a5 | 911 | WARN("Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
912 | goto end; |
913 | } | |
914 | ||
f82f93a1 JG |
915 | *session_uid = channel_info->session_info->uid; |
916 | *session_gid = channel_info->session_info->gid; | |
917 | end: | |
505b2d90 | 918 | rcu_read_unlock(); |
f82f93a1 JG |
919 | return ret; |
920 | } | |
921 | ||
922 | static | |
923 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
924 | { | |
925 | const char *session_name = NULL; | |
926 | enum lttng_condition_status status; | |
927 | ||
928 | switch (lttng_condition_get_type(condition)) { | |
929 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
930 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
931 | status = lttng_condition_buffer_usage_get_session_name( | |
932 | condition, &session_name); | |
933 | break; | |
934 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
935 | status = lttng_condition_session_consumed_size_get_session_name( | |
936 | condition, &session_name); | |
937 | break; | |
938 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
939 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
940 | status = lttng_condition_session_rotation_get_session_name( | |
941 | condition, &session_name); | |
942 | break; | |
943 | default: | |
944 | abort(); | |
945 | } | |
946 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 947 | ERR("Failed to retrieve session rotation condition's session name"); |
f82f93a1 JG |
948 | goto end; |
949 | } | |
950 | end: | |
951 | return session_name; | |
952 | } | |
953 | ||
f82f93a1 JG |
954 | static |
955 | int evaluate_session_condition_for_client( | |
956 | const struct lttng_condition *condition, | |
957 | struct notification_thread_state *state, | |
958 | struct lttng_evaluation **evaluation, | |
959 | uid_t *session_uid, gid_t *session_gid) | |
960 | { | |
961 | int ret; | |
962 | struct cds_lfht_iter iter; | |
963 | struct cds_lfht_node *node; | |
964 | const char *session_name; | |
965 | struct session_info *session_info = NULL; | |
966 | ||
505b2d90 | 967 | rcu_read_lock(); |
f82f93a1 JG |
968 | session_name = get_condition_session_name(condition); |
969 | ||
970 | /* Find the session associated with the trigger. */ | |
971 | cds_lfht_lookup(state->sessions_ht, | |
972 | hash_key_str(session_name, lttng_ht_seed), | |
973 | match_session, | |
974 | session_name, | |
975 | &iter); | |
976 | node = cds_lfht_iter_get_node(&iter); | |
977 | if (!node) { | |
bd0514a5 | 978 | DBG("No known session matching name \"%s\"", |
f82f93a1 JG |
979 | session_name); |
980 | ret = 0; | |
981 | goto end; | |
982 | } | |
983 | ||
984 | session_info = caa_container_of(node, struct session_info, | |
985 | sessions_ht_node); | |
986 | session_info_get(session_info); | |
987 | ||
988 | /* | |
989 | * Evaluation is performed in-line here since only one type of | |
990 | * session-bound condition is handled for the moment. | |
991 | */ | |
992 | switch (lttng_condition_get_type(condition)) { | |
993 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
994 | if (!session_info->rotation.ongoing) { | |
be558f88 | 995 | ret = 0; |
f82f93a1 JG |
996 | goto end_session_put; |
997 | } | |
998 | ||
999 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1000 | session_info->rotation.id); | |
1001 | if (!*evaluation) { | |
1002 | /* Fatal error. */ | |
bd0514a5 | 1003 | ERR("Failed to create session rotation ongoing evaluation for session \"%s\"", |
f82f93a1 JG |
1004 | session_info->name); |
1005 | ret = -1; | |
1006 | goto end_session_put; | |
1007 | } | |
1008 | ret = 0; | |
1009 | break; | |
1010 | default: | |
1011 | ret = 0; | |
1012 | goto end_session_put; | |
1013 | } | |
1014 | ||
1015 | *session_uid = session_info->uid; | |
1016 | *session_gid = session_info->gid; | |
1017 | ||
1018 | end_session_put: | |
1019 | session_info_put(session_info); | |
1020 | end: | |
505b2d90 | 1021 | rcu_read_unlock(); |
f82f93a1 JG |
1022 | return ret; |
1023 | } | |
1024 | ||
f82f93a1 JG |
1025 | static |
1026 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
1027 | const struct lttng_condition *condition, | |
1028 | struct notification_client *client, | |
1029 | struct notification_thread_state *state) | |
1030 | { | |
1031 | int ret; | |
1032 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
1033 | struct notification_client_list client_list = { |
1034 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
1035 | }; | |
f82f93a1 JG |
1036 | struct notification_client_list_element client_list_element = { 0 }; |
1037 | uid_t object_uid = 0; | |
1038 | gid_t object_gid = 0; | |
1039 | ||
a0377dfe FD |
1040 | LTTNG_ASSERT(trigger); |
1041 | LTTNG_ASSERT(condition); | |
1042 | LTTNG_ASSERT(client); | |
1043 | LTTNG_ASSERT(state); | |
f82f93a1 JG |
1044 | |
1045 | switch (get_condition_binding_object(condition)) { | |
1046 | case LTTNG_OBJECT_TYPE_SESSION: | |
1047 | ret = evaluate_session_condition_for_client(condition, state, | |
1048 | &evaluation, &object_uid, &object_gid); | |
1049 | break; | |
1050 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
1051 | ret = evaluate_channel_condition_for_client(condition, state, | |
1052 | &evaluation, &object_uid, &object_gid); | |
1053 | break; | |
1054 | case LTTNG_OBJECT_TYPE_NONE: | |
bd0514a5 | 1055 | DBG("Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
1056 | ret = 0; |
1057 | goto end; | |
1058 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
1059 | default: | |
1060 | ret = -1; | |
1061 | goto end; | |
1062 | } | |
af0c318d JG |
1063 | if (ret) { |
1064 | /* Fatal error. */ | |
1065 | goto end; | |
1066 | } | |
e4db5ace JR |
1067 | if (!evaluation) { |
1068 | /* Evaluation yielded nothing. Normal exit. */ | |
bd0514a5 | 1069 | DBG("Newly subscribed-to condition evaluated to false, nothing to report to client"); |
e4db5ace JR |
1070 | ret = 0; |
1071 | goto end; | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * Create a temporary client list with the client currently | |
1076 | * subscribing. | |
1077 | */ | |
505b2d90 | 1078 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
091fa780 | 1079 | CDS_INIT_LIST_HEAD(&client_list.clients_list); |
e4db5ace JR |
1080 | |
1081 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1082 | client_list_element.client = client; | |
091fa780 | 1083 | cds_list_add(&client_list_element.node, &client_list.clients_list); |
e4db5ace JR |
1084 | |
1085 | /* Send evaluation result to the newly-subscribed client. */ | |
bd0514a5 | 1086 | DBG("Newly subscribed-to condition evaluated to true, notifying client"); |
e4db5ace | 1087 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, |
f82f93a1 | 1088 | state, object_uid, object_gid); |
e4db5ace JR |
1089 | |
1090 | end: | |
1091 | return ret; | |
1092 | } | |
1093 | ||
ab0ee2ca JG |
1094 | static |
1095 | int notification_thread_client_subscribe(struct notification_client *client, | |
1096 | struct lttng_condition *condition, | |
1097 | struct notification_thread_state *state, | |
1098 | enum lttng_notification_channel_status *_status) | |
1099 | { | |
1100 | int ret = 0; | |
505b2d90 | 1101 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1102 | struct lttng_condition_list_element *condition_list_element = NULL; |
1103 | struct notification_client_list_element *client_list_element = NULL; | |
a3ed2a4e | 1104 | struct lttng_trigger_ht_element *trigger_ht_element; |
ab0ee2ca JG |
1105 | enum lttng_notification_channel_status status = |
1106 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1107 | ||
1108 | /* | |
1109 | * Ensure that the client has not already subscribed to this condition | |
1110 | * before. | |
1111 | */ | |
1112 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1113 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1114 | condition)) { | |
1115 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1116 | goto end; | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1121 | if (!condition_list_element) { | |
1122 | ret = -1; | |
1123 | goto error; | |
1124 | } | |
1125 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1126 | if (!client_list_element) { | |
1127 | ret = -1; | |
1128 | goto error; | |
1129 | } | |
1130 | ||
ab0ee2ca JG |
1131 | /* |
1132 | * Add the newly-subscribed condition to the client's subscription list. | |
1133 | */ | |
1134 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1135 | condition_list_element->condition = condition; | |
5a6306f7 | 1136 | condition = NULL; |
ab0ee2ca JG |
1137 | cds_list_add(&condition_list_element->node, &client->condition_list); |
1138 | ||
5a6306f7 JG |
1139 | client_list = get_client_list_from_condition( |
1140 | state, condition_list_element->condition); | |
ed327204 | 1141 | if (!client_list) { |
2ae99f0b JG |
1142 | /* |
1143 | * No notification-emiting trigger registered with this | |
1144 | * condition. We don't evaluate the condition right away | |
1145 | * since this trigger is not registered yet. | |
1146 | */ | |
4fb43b68 | 1147 | free(client_list_element); |
505b2d90 | 1148 | goto end; |
ab0ee2ca JG |
1149 | } |
1150 | ||
2ae99f0b JG |
1151 | /* |
1152 | * The condition to which the client just subscribed is evaluated | |
1153 | * at this point so that conditions that are already TRUE result | |
1154 | * in a notification being sent out. | |
505b2d90 | 1155 | * |
57644a7f JG |
1156 | * Note the iteration on all triggers which share an identical |
1157 | * `condition` than the one to which the client is registering. This is | |
1158 | * done to ensure that the client receives a distinct notification for | |
1159 | * all triggers that have a `notify` action that have this condition. | |
2ae99f0b | 1160 | */ |
091fa780 FD |
1161 | pthread_mutex_lock(&client_list->lock); |
1162 | cds_list_for_each_entry(trigger_ht_element, | |
1163 | &client_list->triggers_list, client_list_trigger_node) { | |
5a6306f7 | 1164 | if (evaluate_condition_for_client(trigger_ht_element->trigger, condition_list_element->condition, |
091fa780 | 1165 | client, state)) { |
bd0514a5 | 1166 | WARN("Evaluation of a condition on client subscription failed, aborting."); |
091fa780 FD |
1167 | ret = -1; |
1168 | free(client_list_element); | |
ecc7ed07 | 1169 | pthread_mutex_unlock(&client_list->lock); |
091fa780 FD |
1170 | goto end; |
1171 | } | |
e4db5ace | 1172 | } |
091fa780 | 1173 | pthread_mutex_unlock(&client_list->lock); |
e4db5ace JR |
1174 | |
1175 | /* | |
1176 | * Add the client to the list of clients interested in a given trigger | |
1177 | * if a "notification" trigger with a corresponding condition was | |
1178 | * added prior. | |
1179 | */ | |
ab0ee2ca JG |
1180 | client_list_element->client = client; |
1181 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1182 | |
1183 | pthread_mutex_lock(&client_list->lock); | |
091fa780 | 1184 | cds_list_add(&client_list_element->node, &client_list->clients_list); |
505b2d90 | 1185 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1186 | end: |
1187 | if (_status) { | |
1188 | *_status = status; | |
1189 | } | |
505b2d90 JG |
1190 | if (client_list) { |
1191 | notification_client_list_put(client_list); | |
1192 | } | |
5a6306f7 | 1193 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1194 | return ret; |
1195 | error: | |
1196 | free(condition_list_element); | |
1197 | free(client_list_element); | |
5a6306f7 | 1198 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1199 | return ret; |
1200 | } | |
1201 | ||
1202 | static | |
1203 | int notification_thread_client_unsubscribe( | |
1204 | struct notification_client *client, | |
1205 | struct lttng_condition *condition, | |
1206 | struct notification_thread_state *state, | |
1207 | enum lttng_notification_channel_status *_status) | |
1208 | { | |
ab0ee2ca JG |
1209 | struct notification_client_list *client_list; |
1210 | struct lttng_condition_list_element *condition_list_element, | |
1211 | *condition_tmp; | |
1212 | struct notification_client_list_element *client_list_element, | |
1213 | *client_tmp; | |
1214 | bool condition_found = false; | |
1215 | enum lttng_notification_channel_status status = | |
1216 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1217 | ||
1218 | /* Remove the condition from the client's condition list. */ | |
1219 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1220 | &client->condition_list, node) { | |
1221 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1222 | condition)) { | |
1223 | continue; | |
1224 | } | |
1225 | ||
1226 | cds_list_del(&condition_list_element->node); | |
1227 | /* | |
1228 | * The caller may be iterating on the client's conditions to | |
1229 | * tear down a client's connection. In this case, the condition | |
1230 | * will be destroyed at the end. | |
1231 | */ | |
1232 | if (condition != condition_list_element->condition) { | |
1233 | lttng_condition_destroy( | |
1234 | condition_list_element->condition); | |
1235 | } | |
1236 | free(condition_list_element); | |
1237 | condition_found = true; | |
1238 | break; | |
1239 | } | |
1240 | ||
1241 | if (!condition_found) { | |
1242 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1243 | goto end; | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Remove the client from the list of clients interested the trigger | |
1248 | * matching the condition. | |
1249 | */ | |
ed327204 JG |
1250 | client_list = get_client_list_from_condition(state, condition); |
1251 | if (!client_list) { | |
505b2d90 | 1252 | goto end; |
ab0ee2ca JG |
1253 | } |
1254 | ||
505b2d90 | 1255 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 1256 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
091fa780 | 1257 | &client_list->clients_list, node) { |
505b2d90 | 1258 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1259 | continue; |
1260 | } | |
1261 | cds_list_del(&client_list_element->node); | |
1262 | free(client_list_element); | |
1263 | break; | |
1264 | } | |
505b2d90 JG |
1265 | pthread_mutex_unlock(&client_list->lock); |
1266 | notification_client_list_put(client_list); | |
1267 | client_list = NULL; | |
ab0ee2ca JG |
1268 | end: |
1269 | lttng_condition_destroy(condition); | |
1270 | if (_status) { | |
1271 | *_status = status; | |
1272 | } | |
1273 | return 0; | |
1274 | } | |
1275 | ||
83b934ad MD |
1276 | static |
1277 | void free_notification_client_rcu(struct rcu_head *node) | |
1278 | { | |
1279 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1280 | } | |
1281 | ||
ab0ee2ca JG |
1282 | static |
1283 | void notification_client_destroy(struct notification_client *client, | |
1284 | struct notification_thread_state *state) | |
1285 | { | |
ab0ee2ca JG |
1286 | if (!client) { |
1287 | return; | |
1288 | } | |
1289 | ||
505b2d90 JG |
1290 | /* |
1291 | * The client object is not reachable by other threads, no need to lock | |
1292 | * the client here. | |
1293 | */ | |
ab0ee2ca JG |
1294 | if (client->socket >= 0) { |
1295 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1296 | client->socket = -1; |
ab0ee2ca | 1297 | } |
505b2d90 | 1298 | client->communication.active = false; |
882093ee JR |
1299 | lttng_payload_reset(&client->communication.inbound.payload); |
1300 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1301 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1302 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1303 | } |
1304 | ||
1305 | /* | |
1306 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1307 | * client pointer). | |
1308 | */ | |
1309 | static | |
1310 | struct notification_client *get_client_from_socket(int socket, | |
1311 | struct notification_thread_state *state) | |
1312 | { | |
1313 | struct cds_lfht_iter iter; | |
1314 | struct cds_lfht_node *node; | |
1315 | struct notification_client *client = NULL; | |
1316 | ||
1317 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1318 | hash_client_socket(socket), |
1319 | match_client_socket, | |
ab0ee2ca JG |
1320 | (void *) (unsigned long) socket, |
1321 | &iter); | |
1322 | node = cds_lfht_iter_get_node(&iter); | |
1323 | if (!node) { | |
1324 | goto end; | |
1325 | } | |
1326 | ||
1327 | client = caa_container_of(node, struct notification_client, | |
1328 | client_socket_ht_node); | |
1329 | end: | |
1330 | return client; | |
1331 | } | |
1332 | ||
f2b3ef9f JG |
1333 | /* |
1334 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1335 | * client pointer). | |
1336 | */ | |
1337 | static | |
1338 | struct notification_client *get_client_from_id(notification_client_id id, | |
1339 | struct notification_thread_state *state) | |
1340 | { | |
1341 | struct cds_lfht_iter iter; | |
1342 | struct cds_lfht_node *node; | |
1343 | struct notification_client *client = NULL; | |
1344 | ||
1345 | cds_lfht_lookup(state->client_id_ht, | |
1346 | hash_client_id(id), | |
1347 | match_client_id, | |
1348 | &id, | |
1349 | &iter); | |
1350 | node = cds_lfht_iter_get_node(&iter); | |
1351 | if (!node) { | |
1352 | goto end; | |
1353 | } | |
1354 | ||
1355 | client = caa_container_of(node, struct notification_client, | |
1356 | client_id_ht_node); | |
1357 | end: | |
1358 | return client; | |
1359 | } | |
1360 | ||
ab0ee2ca | 1361 | static |
e8360425 | 1362 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1363 | const struct lttng_condition *condition, |
1364 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1365 | { |
1366 | enum lttng_condition_status status; | |
e8360425 JD |
1367 | enum lttng_domain_type condition_domain; |
1368 | const char *condition_session_name = NULL; | |
1369 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1370 | |
e8360425 JD |
1371 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1372 | &condition_domain); | |
a0377dfe | 1373 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
e8360425 | 1374 | if (channel_info->key.domain != condition_domain) { |
ab0ee2ca JG |
1375 | goto fail; |
1376 | } | |
1377 | ||
e8360425 JD |
1378 | status = lttng_condition_buffer_usage_get_session_name( |
1379 | condition, &condition_session_name); | |
a0377dfe | 1380 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); |
e8360425 JD |
1381 | |
1382 | status = lttng_condition_buffer_usage_get_channel_name( | |
1383 | condition, &condition_channel_name); | |
a0377dfe | 1384 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); |
e8360425 JD |
1385 | |
1386 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1387 | goto fail; | |
1388 | } | |
1389 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1390 | goto fail; |
1391 | } | |
1392 | ||
e8360425 JD |
1393 | return true; |
1394 | fail: | |
1395 | return false; | |
1396 | } | |
1397 | ||
1398 | static | |
1399 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1400 | const struct lttng_condition *condition, |
1401 | const struct channel_info *channel_info) | |
e8360425 JD |
1402 | { |
1403 | enum lttng_condition_status status; | |
1404 | const char *condition_session_name = NULL; | |
1405 | ||
1406 | status = lttng_condition_session_consumed_size_get_session_name( | |
1407 | condition, &condition_session_name); | |
a0377dfe | 1408 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); |
e8360425 JD |
1409 | |
1410 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1411 | goto fail; |
1412 | } | |
1413 | ||
e8360425 JD |
1414 | return true; |
1415 | fail: | |
1416 | return false; | |
1417 | } | |
ab0ee2ca | 1418 | |
51eab943 JG |
1419 | static |
1420 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1421 | const struct channel_info *channel_info) | |
1422 | { | |
1423 | const struct lttng_condition *condition; | |
e8360425 | 1424 | bool trigger_applies; |
ab0ee2ca | 1425 | |
51eab943 | 1426 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1427 | if (!condition) { |
ab0ee2ca JG |
1428 | goto fail; |
1429 | } | |
e8360425 JD |
1430 | |
1431 | switch (lttng_condition_get_type(condition)) { | |
1432 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1433 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1434 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1435 | condition, channel_info); | |
1436 | break; | |
1437 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1438 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1439 | condition, channel_info); | |
1440 | break; | |
1441 | default: | |
ab0ee2ca JG |
1442 | goto fail; |
1443 | } | |
1444 | ||
e8360425 | 1445 | return trigger_applies; |
ab0ee2ca JG |
1446 | fail: |
1447 | return false; | |
1448 | } | |
1449 | ||
ed327204 JG |
1450 | /* Must be called with RCU read lock held. */ |
1451 | static | |
1452 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1453 | struct notification_thread_state *state, | |
1454 | const char *session_name) | |
1455 | { | |
1456 | struct lttng_session_trigger_list *list = NULL; | |
1457 | struct cds_lfht_node *node; | |
1458 | struct cds_lfht_iter iter; | |
1459 | ||
1460 | cds_lfht_lookup(state->session_triggers_ht, | |
1461 | hash_key_str(session_name, lttng_ht_seed), | |
1462 | match_session_trigger_list, | |
1463 | session_name, | |
1464 | &iter); | |
1465 | node = cds_lfht_iter_get_node(&iter); | |
1466 | if (!node) { | |
1467 | /* | |
1468 | * Not an error, the list of triggers applying to that session | |
1469 | * will be initialized when the session is created. | |
1470 | */ | |
bd0514a5 | 1471 | DBG("No trigger list found for session \"%s\" as it is not yet known to the notification system", |
ed327204 JG |
1472 | session_name); |
1473 | goto end; | |
1474 | } | |
1475 | ||
e742b055 | 1476 | list = caa_container_of(node, |
ed327204 JG |
1477 | struct lttng_session_trigger_list, |
1478 | session_triggers_ht_node); | |
1479 | end: | |
1480 | return list; | |
1481 | } | |
1482 | ||
ea9a44f0 JG |
1483 | /* |
1484 | * Allocate an empty lttng_session_trigger_list for the session named | |
1485 | * 'session_name'. | |
1486 | * | |
1487 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1488 | * It is the caller's responsability to ensure the session name is alive | |
1489 | * for as long as this list is. | |
1490 | */ | |
1491 | static | |
1492 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1493 | const char *session_name, | |
1494 | struct cds_lfht *session_triggers_ht) | |
1495 | { | |
1496 | struct lttng_session_trigger_list *list; | |
1497 | ||
1498 | list = zmalloc(sizeof(*list)); | |
1499 | if (!list) { | |
1500 | goto end; | |
1501 | } | |
1502 | list->session_name = session_name; | |
1503 | CDS_INIT_LIST_HEAD(&list->list); | |
1504 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1505 | list->session_triggers_ht = session_triggers_ht; | |
1506 | ||
1507 | rcu_read_lock(); | |
1508 | /* Publish the list through the session_triggers_ht. */ | |
1509 | cds_lfht_add(session_triggers_ht, | |
1510 | hash_key_str(session_name, lttng_ht_seed), | |
1511 | &list->session_triggers_ht_node); | |
1512 | rcu_read_unlock(); | |
1513 | end: | |
1514 | return list; | |
1515 | } | |
1516 | ||
1517 | static | |
1518 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1519 | { | |
1520 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1521 | rcu_node)); | |
1522 | } | |
1523 | ||
1524 | static | |
1525 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1526 | { | |
1527 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1528 | ||
1529 | /* Empty the list element by element, and then free the list itself. */ | |
1530 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1531 | &list->list, node) { | |
1532 | cds_list_del(&trigger_list_element->node); | |
1533 | free(trigger_list_element); | |
1534 | } | |
1535 | rcu_read_lock(); | |
1536 | /* Unpublish the list from the session_triggers_ht. */ | |
1537 | cds_lfht_del(list->session_triggers_ht, | |
1538 | &list->session_triggers_ht_node); | |
1539 | rcu_read_unlock(); | |
1540 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1541 | } | |
1542 | ||
1543 | static | |
1544 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1545 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1546 | { |
1547 | int ret = 0; | |
1548 | struct lttng_trigger_list_element *new_element = | |
1549 | zmalloc(sizeof(*new_element)); | |
1550 | ||
1551 | if (!new_element) { | |
1552 | ret = -1; | |
1553 | goto end; | |
1554 | } | |
1555 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1556 | new_element->trigger = trigger; | |
1557 | cds_list_add(&new_element->node, &list->list); | |
1558 | end: | |
1559 | return ret; | |
1560 | } | |
1561 | ||
1562 | static | |
1563 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1564 | const char *session_name) | |
1565 | { | |
1566 | bool applies = false; | |
1567 | const struct lttng_condition *condition; | |
1568 | ||
1569 | condition = lttng_trigger_get_const_condition(trigger); | |
1570 | switch (lttng_condition_get_type(condition)) { | |
1571 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1572 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1573 | { | |
1574 | enum lttng_condition_status condition_status; | |
1575 | const char *condition_session_name; | |
1576 | ||
1577 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1578 | condition, &condition_session_name); | |
1579 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 1580 | ERR("Failed to retrieve session rotation condition's session name"); |
ea9a44f0 JG |
1581 | goto end; |
1582 | } | |
1583 | ||
a0377dfe | 1584 | LTTNG_ASSERT(condition_session_name); |
ea9a44f0 JG |
1585 | applies = !strcmp(condition_session_name, session_name); |
1586 | break; | |
1587 | } | |
1588 | default: | |
1589 | goto end; | |
1590 | } | |
1591 | end: | |
1592 | return applies; | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1597 | * all triggers that apply to the session named 'session_name'. | |
1598 | * | |
1599 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1600 | * It is the caller's responsability to ensure the session name is alive | |
1601 | * for as long as this list is. | |
1602 | */ | |
1603 | static | |
1604 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1605 | const struct notification_thread_state *state, | |
1606 | const char *session_name) | |
1607 | { | |
1608 | int trigger_count = 0; | |
1609 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1610 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1611 | struct cds_lfht_iter iter; | |
1612 | ||
1613 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1614 | state->session_triggers_ht); | |
1615 | ||
1616 | /* Add all triggers applying to the session named 'session_name'. */ | |
1617 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1618 | node) { | |
1619 | int ret; | |
1620 | ||
1621 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1622 | session_name)) { | |
1623 | continue; | |
1624 | } | |
1625 | ||
1626 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1627 | trigger_ht_element->trigger); | |
1628 | if (ret) { | |
1629 | goto error; | |
1630 | } | |
1631 | ||
1632 | trigger_count++; | |
1633 | } | |
1634 | ||
bd0514a5 | 1635 | DBG("Found %i triggers that apply to newly created session", |
ea9a44f0 JG |
1636 | trigger_count); |
1637 | return session_trigger_list; | |
1638 | error: | |
1639 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1640 | return NULL; | |
1641 | } | |
1642 | ||
8abe313a JG |
1643 | static |
1644 | struct session_info *find_or_create_session_info( | |
1645 | struct notification_thread_state *state, | |
1646 | const char *name, uid_t uid, gid_t gid) | |
1647 | { | |
1648 | struct session_info *session = NULL; | |
1649 | struct cds_lfht_node *node; | |
1650 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1651 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1652 | |
1653 | rcu_read_lock(); | |
1654 | cds_lfht_lookup(state->sessions_ht, | |
1655 | hash_key_str(name, lttng_ht_seed), | |
1656 | match_session, | |
1657 | name, | |
1658 | &iter); | |
1659 | node = cds_lfht_iter_get_node(&iter); | |
1660 | if (node) { | |
bd0514a5 | 1661 | DBG("Found session info of session \"%s\" (uid = %i, gid = %i)", |
8abe313a JG |
1662 | name, uid, gid); |
1663 | session = caa_container_of(node, struct session_info, | |
1664 | sessions_ht_node); | |
a0377dfe FD |
1665 | LTTNG_ASSERT(session->uid == uid); |
1666 | LTTNG_ASSERT(session->gid == gid); | |
1eee26c5 JG |
1667 | session_info_get(session); |
1668 | goto end; | |
ea9a44f0 JG |
1669 | } |
1670 | ||
1671 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1672 | if (!trigger_list) { | |
1673 | goto error; | |
8abe313a JG |
1674 | } |
1675 | ||
1eee26c5 JG |
1676 | session = session_info_create(name, uid, gid, trigger_list, |
1677 | state->sessions_ht); | |
8abe313a | 1678 | if (!session) { |
bd0514a5 | 1679 | ERR("Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", |
8abe313a | 1680 | name, uid, gid); |
b248644d | 1681 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1682 | goto error; |
8abe313a | 1683 | } |
ea9a44f0 | 1684 | trigger_list = NULL; |
577983cb JG |
1685 | |
1686 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1687 | &session->sessions_ht_node); |
1eee26c5 | 1688 | end: |
8abe313a JG |
1689 | rcu_read_unlock(); |
1690 | return session; | |
ea9a44f0 JG |
1691 | error: |
1692 | rcu_read_unlock(); | |
1693 | session_info_put(session); | |
1694 | return NULL; | |
8abe313a JG |
1695 | } |
1696 | ||
ab0ee2ca JG |
1697 | static |
1698 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1699 | struct notification_thread_state *state, |
1700 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1701 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1702 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1703 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1704 | { |
1705 | struct cds_list_head trigger_list; | |
8abe313a JG |
1706 | struct channel_info *new_channel_info = NULL; |
1707 | struct channel_key channel_key = { | |
1708 | .key = channel_key_int, | |
1709 | .domain = channel_domain, | |
1710 | }; | |
ab0ee2ca JG |
1711 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1712 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1713 | int trigger_count = 0; | |
1714 | struct cds_lfht_iter iter; | |
8abe313a | 1715 | struct session_info *session_info = NULL; |
ab0ee2ca | 1716 | |
bd0514a5 | 1717 | DBG("Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", |
8abe313a | 1718 | channel_name, session_name, channel_key_int, |
526200e4 | 1719 | lttng_domain_type_str(channel_domain)); |
ab0ee2ca JG |
1720 | |
1721 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1722 | ||
8abe313a JG |
1723 | session_info = find_or_create_session_info(state, session_name, |
1724 | session_uid, session_gid); | |
1725 | if (!session_info) { | |
a9577b76 | 1726 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1727 | goto error; |
1728 | } | |
1729 | ||
8abe313a JG |
1730 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1731 | channel_capacity, session_info); | |
1732 | if (!new_channel_info) { | |
1733 | goto error; | |
1734 | } | |
ab0ee2ca | 1735 | |
83b934ad | 1736 | rcu_read_lock(); |
ab0ee2ca JG |
1737 | /* Build a list of all triggers applying to the new channel. */ |
1738 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1739 | node) { | |
1740 | struct lttng_trigger_list_element *new_element; | |
1741 | ||
1742 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1743 | new_channel_info)) { |
ab0ee2ca JG |
1744 | continue; |
1745 | } | |
1746 | ||
1747 | new_element = zmalloc(sizeof(*new_element)); | |
1748 | if (!new_element) { | |
83b934ad | 1749 | rcu_read_unlock(); |
ab0ee2ca JG |
1750 | goto error; |
1751 | } | |
1752 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1753 | new_element->trigger = trigger_ht_element->trigger; | |
1754 | cds_list_add(&new_element->node, &trigger_list); | |
1755 | trigger_count++; | |
1756 | } | |
83b934ad | 1757 | rcu_read_unlock(); |
ab0ee2ca | 1758 | |
bd0514a5 | 1759 | DBG("Found %i triggers that apply to newly added channel", |
ab0ee2ca JG |
1760 | trigger_count); |
1761 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1762 | if (!channel_trigger_list) { | |
1763 | goto error; | |
1764 | } | |
8abe313a | 1765 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1766 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1767 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1768 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1769 | ||
1770 | rcu_read_lock(); | |
1771 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1772 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1773 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1774 | &new_channel_info->channels_ht_node); |
1775 | /* | |
1776 | * Add the list of triggers associated with this channel to the | |
1777 | * channel_triggers_ht. | |
1778 | */ | |
1779 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1780 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1781 | &channel_trigger_list->channel_triggers_ht_node); |
1782 | rcu_read_unlock(); | |
1eee26c5 | 1783 | session_info_put(session_info); |
ab0ee2ca JG |
1784 | *cmd_result = LTTNG_OK; |
1785 | return 0; | |
1786 | error: | |
ab0ee2ca | 1787 | channel_info_destroy(new_channel_info); |
8abe313a | 1788 | session_info_put(session_info); |
ab0ee2ca JG |
1789 | return 1; |
1790 | } | |
1791 | ||
83b934ad MD |
1792 | static |
1793 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1794 | { | |
1795 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1796 | rcu_node)); | |
1797 | } | |
1798 | ||
1799 | static | |
1800 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1801 | { | |
1802 | free(caa_container_of(node, struct channel_state_sample, | |
1803 | rcu_node)); | |
1804 | } | |
1805 | ||
ab0ee2ca JG |
1806 | static |
1807 | int handle_notification_thread_command_remove_channel( | |
1808 | struct notification_thread_state *state, | |
1809 | uint64_t channel_key, enum lttng_domain_type domain, | |
1810 | enum lttng_error_code *cmd_result) | |
1811 | { | |
1812 | struct cds_lfht_node *node; | |
1813 | struct cds_lfht_iter iter; | |
1814 | struct lttng_channel_trigger_list *trigger_list; | |
1815 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1816 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1817 | struct channel_info *channel_info; | |
1818 | ||
bd0514a5 | 1819 | DBG("Removing channel key = %" PRIu64 " in %s domain", |
526200e4 | 1820 | channel_key, lttng_domain_type_str(domain)); |
ab0ee2ca JG |
1821 | |
1822 | rcu_read_lock(); | |
1823 | ||
1824 | cds_lfht_lookup(state->channel_triggers_ht, | |
1825 | hash_channel_key(&key), | |
1826 | match_channel_trigger_list, | |
1827 | &key, | |
1828 | &iter); | |
1829 | node = cds_lfht_iter_get_node(&iter); | |
1830 | /* | |
1831 | * There is a severe internal error if we are being asked to remove a | |
1832 | * channel that doesn't exist. | |
1833 | */ | |
1834 | if (!node) { | |
bd0514a5 | 1835 | ERR("Channel being removed is unknown to the notification thread"); |
ab0ee2ca JG |
1836 | goto end; |
1837 | } | |
1838 | ||
1839 | /* Free the list of triggers associated with this channel. */ | |
1840 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1841 | channel_triggers_ht_node); | |
1842 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1843 | &trigger_list->list, node) { | |
1844 | cds_list_del(&trigger_list_element->node); | |
1845 | free(trigger_list_element); | |
1846 | } | |
1847 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1848 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1849 | |
1850 | /* Free sampled channel state. */ | |
1851 | cds_lfht_lookup(state->channel_state_ht, | |
1852 | hash_channel_key(&key), | |
1853 | match_channel_state_sample, | |
1854 | &key, | |
1855 | &iter); | |
1856 | node = cds_lfht_iter_get_node(&iter); | |
1857 | /* | |
1858 | * This is expected to be NULL if the channel is destroyed before we | |
1859 | * received a sample. | |
1860 | */ | |
1861 | if (node) { | |
1862 | struct channel_state_sample *sample = caa_container_of(node, | |
1863 | struct channel_state_sample, | |
1864 | channel_state_ht_node); | |
1865 | ||
1866 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1867 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1868 | } |
1869 | ||
1870 | /* Remove the channel from the channels_ht and free it. */ | |
1871 | cds_lfht_lookup(state->channels_ht, | |
1872 | hash_channel_key(&key), | |
1873 | match_channel_info, | |
1874 | &key, | |
1875 | &iter); | |
1876 | node = cds_lfht_iter_get_node(&iter); | |
a0377dfe | 1877 | LTTNG_ASSERT(node); |
ab0ee2ca JG |
1878 | channel_info = caa_container_of(node, struct channel_info, |
1879 | channels_ht_node); | |
1880 | cds_lfht_del(state->channels_ht, node); | |
1881 | channel_info_destroy(channel_info); | |
1882 | end: | |
1883 | rcu_read_unlock(); | |
1884 | *cmd_result = LTTNG_OK; | |
1885 | return 0; | |
1886 | } | |
1887 | ||
0ca52944 | 1888 | static |
ed327204 | 1889 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1890 | struct notification_thread_state *state, |
ed327204 JG |
1891 | enum notification_thread_command_type cmd_type, |
1892 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1893 | uint64_t trace_archive_chunk_id, | |
1894 | struct lttng_trace_archive_location *location, | |
1895 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1896 | { |
ed327204 JG |
1897 | int ret = 0; |
1898 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1899 | struct lttng_session_trigger_list *trigger_list; | |
1900 | struct lttng_trigger_list_element *trigger_list_element; | |
1901 | struct session_info *session_info; | |
f2b3ef9f | 1902 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1903 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1904 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1905 | }; |
0ca52944 | 1906 | |
ed327204 JG |
1907 | rcu_read_lock(); |
1908 | ||
1909 | session_info = find_or_create_session_info(state, session_name, | |
1910 | session_uid, session_gid); | |
1911 | if (!session_info) { | |
a9577b76 | 1912 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1913 | ret = -1; |
1914 | cmd_result = LTTNG_ERR_NOMEM; | |
1915 | goto end; | |
1916 | } | |
1917 | ||
1918 | session_info->rotation.ongoing = | |
1919 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1920 | session_info->rotation.id = trace_archive_chunk_id; | |
1921 | trigger_list = get_session_trigger_list(state, session_name); | |
1922 | if (!trigger_list) { | |
bd0514a5 | 1923 | DBG("No triggers applying to session \"%s\" found", |
ed327204 JG |
1924 | session_name); |
1925 | goto end; | |
1926 | } | |
1927 | ||
1928 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1929 | node) { | |
1930 | const struct lttng_condition *condition; | |
f2b3ef9f | 1931 | struct lttng_trigger *trigger; |
ed327204 JG |
1932 | struct notification_client_list *client_list; |
1933 | struct lttng_evaluation *evaluation = NULL; | |
1934 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1935 | enum action_executor_status executor_status; |
ed327204 JG |
1936 | |
1937 | trigger = trigger_list_element->trigger; | |
1938 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 1939 | LTTNG_ASSERT(condition); |
ed327204 JG |
1940 | condition_type = lttng_condition_get_type(condition); |
1941 | ||
1942 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1943 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1944 | continue; | |
1945 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1946 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1947 | continue; | |
1948 | } | |
1949 | ||
ed327204 | 1950 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1951 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1952 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1953 | trace_archive_chunk_id); | |
1954 | } else { | |
1955 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1956 | trace_archive_chunk_id, location); | |
1957 | } | |
1958 | ||
1959 | if (!evaluation) { | |
1960 | /* Internal error */ | |
1961 | ret = -1; | |
1962 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1963 | goto put_list; |
ed327204 JG |
1964 | } |
1965 | ||
f2b3ef9f JG |
1966 | /* |
1967 | * Ownership of `evaluation` transferred to the action executor | |
1968 | * no matter the result. | |
1969 | */ | |
72365501 JR |
1970 | executor_status = action_executor_enqueue_trigger( |
1971 | state->executor, trigger, evaluation, | |
1972 | &session_creds, client_list); | |
f2b3ef9f JG |
1973 | evaluation = NULL; |
1974 | switch (executor_status) { | |
1975 | case ACTION_EXECUTOR_STATUS_OK: | |
1976 | break; | |
1977 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1978 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1979 | /* | |
1980 | * TODO Add trigger identification (name/id) when | |
1981 | * it is added to the API. | |
1982 | */ | |
1983 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1984 | ret = -1; | |
1985 | goto put_list; | |
1986 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1987 | /* | |
1988 | * TODO Add trigger identification (name/id) when | |
1989 | * it is added to the API. | |
1990 | * | |
1991 | * Not a fatal error. | |
1992 | */ | |
1993 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1994 | ret = 0; | |
1995 | goto put_list; | |
1996 | default: | |
1997 | abort(); | |
1998 | } | |
1999 | ||
505b2d90 JG |
2000 | put_list: |
2001 | notification_client_list_put(client_list); | |
ed327204 | 2002 | if (caa_unlikely(ret)) { |
505b2d90 | 2003 | break; |
ed327204 JG |
2004 | } |
2005 | } | |
2006 | end: | |
2007 | session_info_put(session_info); | |
2008 | *_cmd_result = cmd_result; | |
2009 | rcu_read_unlock(); | |
2010 | return ret; | |
0ca52944 JG |
2011 | } |
2012 | ||
d02d7404 JR |
2013 | static |
2014 | int handle_notification_thread_command_add_tracer_event_source( | |
2015 | struct notification_thread_state *state, | |
2016 | int tracer_event_source_fd, | |
2017 | enum lttng_domain_type domain_type, | |
2018 | enum lttng_error_code *_cmd_result) | |
2019 | { | |
2020 | int ret = 0; | |
2021 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2022 | struct notification_event_tracer_event_source_element *element = NULL; | |
2023 | ||
2024 | element = zmalloc(sizeof(*element)); | |
2025 | if (!element) { | |
2026 | cmd_result = LTTNG_ERR_NOMEM; | |
2027 | ret = -1; | |
2028 | goto end; | |
2029 | } | |
2030 | ||
d02d7404 JR |
2031 | element->fd = tracer_event_source_fd; |
2032 | element->domain = domain_type; | |
2033 | ||
2034 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
2035 | ||
bd0514a5 | 2036 | DBG3("Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
2037 | tracer_event_source_fd, |
2038 | lttng_domain_type_str(domain_type)); | |
2039 | ||
2040 | /* Adding the read side pipe to the event poll. */ | |
2041 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLIN | LPOLLERR); | |
2042 | if (ret < 0) { | |
bd0514a5 | 2043 | ERR("Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
2044 | tracer_event_source_fd, |
2045 | lttng_domain_type_str(element->domain)); | |
2046 | cds_list_del(&element->node); | |
2047 | free(element); | |
2048 | goto end; | |
2049 | } | |
2050 | ||
2051 | element->is_fd_in_poll_set = true; | |
2052 | ||
2053 | end: | |
2054 | *_cmd_result = cmd_result; | |
2055 | return ret; | |
2056 | } | |
2057 | ||
8b524060 FD |
2058 | static |
2059 | int drain_event_notifier_notification_pipe( | |
2060 | struct notification_thread_state *state, | |
2061 | int pipe, enum lttng_domain_type domain) | |
2062 | { | |
2063 | struct lttng_poll_event events = {0}; | |
2064 | int ret; | |
2065 | ||
2066 | ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC); | |
2067 | if (ret < 0) { | |
bd0514a5 | 2068 | ERR("Error creating lttng_poll_event"); |
8b524060 FD |
2069 | goto end; |
2070 | } | |
2071 | ||
2072 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2073 | if (ret < 0) { | |
bd0514a5 | 2074 | ERR("Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", |
8b524060 FD |
2075 | pipe); |
2076 | goto end; | |
2077 | } | |
2078 | ||
2079 | while (true) { | |
2080 | /* | |
2081 | * Continue to consume notifications as long as there are new | |
2082 | * ones coming in. The tracer has been asked to stop producing | |
2083 | * them. | |
2084 | * | |
2085 | * LPOLLIN is explicitly checked since LPOLLHUP is implicitly | |
2086 | * monitored (on Linux, at least) and will be returned when | |
2087 | * the pipe is closed but empty. | |
2088 | */ | |
2089 | ret = lttng_poll_wait_interruptible(&events, 0); | |
a17b133b | 2090 | if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) { |
8b524060 FD |
2091 | /* No more notification to be read on this pipe. */ |
2092 | ret = 0; | |
2093 | goto end; | |
2094 | } else if (ret < 0) { | |
2095 | PERROR("Failed on lttng_poll_wait_interruptible() call"); | |
2096 | ret = -1; | |
2097 | goto end; | |
2098 | } | |
2099 | ||
2100 | ret = handle_one_event_notifier_notification(state, pipe, domain); | |
2101 | if (ret) { | |
bd0514a5 | 2102 | ERR("Error consuming an event notifier notification from pipe: fd = %d", |
8b524060 FD |
2103 | pipe); |
2104 | } | |
2105 | } | |
2106 | end: | |
2107 | lttng_poll_clean(&events); | |
2108 | return ret; | |
2109 | } | |
2110 | ||
d02d7404 | 2111 | static |
34bf4f69 FD |
2112 | struct notification_event_tracer_event_source_element * |
2113 | find_tracer_event_source_element(struct notification_thread_state *state, | |
2114 | int tracer_event_source_fd) | |
d02d7404 | 2115 | { |
34bf4f69 | 2116 | struct notification_event_tracer_event_source_element *source_element; |
d02d7404 | 2117 | |
34bf4f69 | 2118 | cds_list_for_each_entry(source_element, |
d02d7404 | 2119 | &state->tracer_event_sources_list, node) { |
34bf4f69 FD |
2120 | if (source_element->fd == tracer_event_source_fd) { |
2121 | goto end; | |
d02d7404 | 2122 | } |
d02d7404 JR |
2123 | } |
2124 | ||
34bf4f69 FD |
2125 | source_element = NULL; |
2126 | end: | |
97cf926d | 2127 | return source_element; |
34bf4f69 | 2128 | } |
d02d7404 | 2129 | |
34bf4f69 FD |
2130 | static |
2131 | int remove_tracer_event_source_from_pollset( | |
2132 | struct notification_thread_state *state, | |
2133 | struct notification_event_tracer_event_source_element *source_element) | |
2134 | { | |
2135 | int ret = 0; | |
2136 | ||
a0377dfe | 2137 | LTTNG_ASSERT(source_element->is_fd_in_poll_set); |
d02d7404 | 2138 | |
bd0514a5 | 2139 | DBG3("Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
34bf4f69 | 2140 | source_element->fd, |
d02d7404 JR |
2141 | lttng_domain_type_str(source_element->domain)); |
2142 | ||
2143 | /* Removing the fd from the event poll set. */ | |
34bf4f69 | 2144 | ret = lttng_poll_del(&state->events, source_element->fd); |
d02d7404 | 2145 | if (ret < 0) { |
bd0514a5 | 2146 | ERR("Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
34bf4f69 | 2147 | source_element->fd, |
d02d7404 | 2148 | lttng_domain_type_str(source_element->domain)); |
34bf4f69 | 2149 | ret = -1; |
d02d7404 JR |
2150 | goto end; |
2151 | } | |
2152 | ||
173900f6 JG |
2153 | source_element->is_fd_in_poll_set = false; |
2154 | ||
34bf4f69 | 2155 | ret = drain_event_notifier_notification_pipe(state, source_element->fd, |
8b524060 FD |
2156 | source_element->domain); |
2157 | if (ret) { | |
bd0514a5 | 2158 | ERR("Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", |
34bf4f69 | 2159 | source_element->fd, |
8b524060 | 2160 | lttng_domain_type_str(source_element->domain)); |
34bf4f69 | 2161 | ret = -1; |
8b524060 FD |
2162 | goto end; |
2163 | } | |
2164 | ||
d02d7404 | 2165 | end: |
d02d7404 JR |
2166 | return ret; |
2167 | } | |
2168 | ||
34bf4f69 | 2169 | int handle_notification_thread_tracer_event_source_died( |
d02d7404 JR |
2170 | struct notification_thread_state *state, |
2171 | int tracer_event_source_fd) | |
2172 | { | |
34bf4f69 FD |
2173 | int ret = 0; |
2174 | struct notification_event_tracer_event_source_element *source_element; | |
2175 | ||
2176 | source_element = find_tracer_event_source_element(state, | |
2177 | tracer_event_source_fd); | |
2178 | ||
a0377dfe | 2179 | LTTNG_ASSERT(source_element); |
34bf4f69 FD |
2180 | |
2181 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2182 | if (ret) { | |
2183 | ERR("Failed to remove dead tracer event source from poll set"); | |
2184 | } | |
d02d7404 | 2185 | |
34bf4f69 FD |
2186 | return ret; |
2187 | } | |
2188 | ||
2189 | static | |
2190 | int handle_notification_thread_command_remove_tracer_event_source( | |
2191 | struct notification_thread_state *state, | |
2192 | int tracer_event_source_fd, | |
2193 | enum lttng_error_code *_cmd_result) | |
2194 | { | |
2195 | int ret = 0; | |
2196 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2197 | struct notification_event_tracer_event_source_element *source_element = NULL; | |
2198 | ||
2199 | source_element = find_tracer_event_source_element(state, | |
2200 | tracer_event_source_fd); | |
2201 | ||
a0377dfe | 2202 | LTTNG_ASSERT(source_element); |
34bf4f69 FD |
2203 | |
2204 | /* Remove the tracer source from the list. */ | |
2205 | cds_list_del(&source_element->node); | |
2206 | ||
2207 | if (!source_element->is_fd_in_poll_set) { | |
2208 | /* Skip the poll set removal. */ | |
2209 | goto end; | |
2210 | } | |
2211 | ||
2212 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2213 | if (ret) { | |
2214 | ERR("Failed to remove tracer event source from poll set"); | |
2215 | cmd_result = LTTNG_ERR_FATAL; | |
2216 | } | |
2217 | ||
2218 | end: | |
2219 | free(source_element); | |
2220 | *_cmd_result = cmd_result; | |
d02d7404 JR |
2221 | return ret; |
2222 | } | |
2223 | ||
fbc9f37d JR |
2224 | static int handle_notification_thread_command_list_triggers( |
2225 | struct notification_thread_handle *handle, | |
2226 | struct notification_thread_state *state, | |
2227 | uid_t client_uid, | |
2228 | struct lttng_triggers **triggers, | |
2229 | enum lttng_error_code *_cmd_result) | |
2230 | { | |
2231 | int ret = 0; | |
2232 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2233 | struct cds_lfht_iter iter; | |
2234 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2235 | struct lttng_triggers *local_triggers = NULL; | |
2236 | const struct lttng_credentials *creds; | |
2237 | ||
2238 | rcu_read_lock(); | |
2239 | ||
2240 | local_triggers = lttng_triggers_create(); | |
2241 | if (!local_triggers) { | |
2242 | /* Not a fatal error. */ | |
2243 | cmd_result = LTTNG_ERR_NOMEM; | |
2244 | goto end; | |
2245 | } | |
2246 | ||
2247 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2248 | trigger_ht_element, node) { | |
2249 | /* | |
2250 | * Only return the triggers to which the client has access. | |
2251 | * The root user has visibility over all triggers. | |
2252 | */ | |
2253 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2254 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2255 | continue; | |
2256 | } | |
2257 | ||
2258 | ret = lttng_triggers_add(local_triggers, | |
2259 | trigger_ht_element->trigger); | |
2260 | if (ret < 0) { | |
2261 | /* Not a fatal error. */ | |
2262 | ret = 0; | |
2263 | cmd_result = LTTNG_ERR_NOMEM; | |
2264 | goto end; | |
2265 | } | |
2266 | } | |
2267 | ||
2268 | /* Transferring ownership to the caller. */ | |
2269 | *triggers = local_triggers; | |
2270 | local_triggers = NULL; | |
2271 | ||
2272 | end: | |
2273 | rcu_read_unlock(); | |
2274 | lttng_triggers_destroy(local_triggers); | |
2275 | *_cmd_result = cmd_result; | |
2276 | return ret; | |
2277 | } | |
2278 | ||
8790759c FD |
2279 | static inline void get_trigger_info_for_log(const struct lttng_trigger *trigger, |
2280 | const char **trigger_name, | |
2281 | uid_t *trigger_owner_uid) | |
2282 | { | |
2283 | enum lttng_trigger_status trigger_status; | |
2284 | ||
2285 | trigger_status = lttng_trigger_get_name(trigger, trigger_name); | |
2286 | switch (trigger_status) { | |
2287 | case LTTNG_TRIGGER_STATUS_OK: | |
2288 | break; | |
2289 | case LTTNG_TRIGGER_STATUS_UNSET: | |
0efb2ad7 | 2290 | *trigger_name = "(anonymous)"; |
8790759c FD |
2291 | break; |
2292 | default: | |
2293 | abort(); | |
2294 | } | |
2295 | ||
2296 | trigger_status = lttng_trigger_get_owner_uid(trigger, | |
2297 | trigger_owner_uid); | |
a0377dfe | 2298 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
8790759c FD |
2299 | } |
2300 | ||
2301 | static int handle_notification_thread_command_get_trigger( | |
2302 | struct notification_thread_state *state, | |
2303 | const struct lttng_trigger *trigger, | |
2304 | struct lttng_trigger **registered_trigger, | |
2305 | enum lttng_error_code *_cmd_result) | |
2306 | { | |
2307 | int ret = -1; | |
2308 | struct cds_lfht_iter iter; | |
2309 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2310 | enum lttng_error_code cmd_result = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2311 | const char *trigger_name; | |
2312 | uid_t trigger_owner_uid; | |
2313 | ||
2314 | rcu_read_lock(); | |
2315 | ||
2316 | cds_lfht_for_each_entry( | |
2317 | state->triggers_ht, &iter, trigger_ht_element, node) { | |
2318 | if (lttng_trigger_is_equal( | |
2319 | trigger, trigger_ht_element->trigger)) { | |
2320 | /* Take one reference on the return trigger. */ | |
2321 | *registered_trigger = trigger_ht_element->trigger; | |
2322 | lttng_trigger_get(*registered_trigger); | |
2323 | ret = 0; | |
2324 | cmd_result = LTTNG_OK; | |
2325 | goto end; | |
2326 | } | |
2327 | } | |
2328 | ||
2329 | /* Not a fatal error if the trigger is not found. */ | |
2330 | get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid); | |
87661585 | 2331 | DBG("Failed to retrieve registered version of trigger: trigger name = '%s', trigger owner uid = %d", |
8790759c FD |
2332 | trigger_name, (int) trigger_owner_uid); |
2333 | ||
2334 | ret = 0; | |
2335 | ||
2336 | end: | |
2337 | rcu_read_unlock(); | |
2338 | *_cmd_result = cmd_result; | |
2339 | return ret; | |
2340 | } | |
2341 | ||
1da26331 | 2342 | static |
959e3c66 | 2343 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2344 | { |
959e3c66 | 2345 | bool is_supported; |
1da26331 JG |
2346 | |
2347 | switch (lttng_condition_get_type(condition)) { | |
2348 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2349 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2350 | { | |
959e3c66 | 2351 | int ret; |
1da26331 JG |
2352 | enum lttng_domain_type domain; |
2353 | ||
2354 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2355 | &domain); | |
a0377dfe | 2356 | LTTNG_ASSERT(ret == 0); |
1da26331 JG |
2357 | |
2358 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2359 | is_supported = true; |
1da26331 JG |
2360 | goto end; |
2361 | } | |
2362 | ||
2363 | /* | |
2364 | * Older kernel tracers don't expose the API to monitor their | |
2365 | * buffers. Therefore, we reject triggers that require that | |
2366 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2367 | * |
2368 | * Assume unsupported on error. | |
1da26331 | 2369 | */ |
959e3c66 JR |
2370 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2371 | break; | |
2372 | } | |
8dbb86b8 | 2373 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 JR |
2374 | { |
2375 | const struct lttng_event_rule *event_rule; | |
2376 | enum lttng_domain_type domain; | |
2377 | const enum lttng_condition_status status = | |
8dbb86b8 | 2378 | lttng_condition_event_rule_matches_get_rule( |
959e3c66 JR |
2379 | condition, &event_rule); |
2380 | ||
a0377dfe | 2381 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
959e3c66 JR |
2382 | |
2383 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2384 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2385 | is_supported = true; | |
2386 | goto end; | |
2387 | } | |
2388 | ||
2389 | /* | |
2390 | * Older kernel tracers can't emit notification. Therefore, we | |
2391 | * reject triggers that require that mechanism to be available | |
2392 | * to be evaluated. | |
2393 | * | |
2394 | * Assume unsupported on error. | |
2395 | */ | |
2396 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2397 | break; |
2398 | } | |
2399 | default: | |
959e3c66 | 2400 | is_supported = true; |
1da26331 JG |
2401 | } |
2402 | end: | |
959e3c66 | 2403 | return is_supported; |
1da26331 JG |
2404 | } |
2405 | ||
51eab943 JG |
2406 | /* Must be called with RCU read lock held. */ |
2407 | static | |
f2b3ef9f | 2408 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2409 | struct notification_thread_state *state) |
2410 | { | |
2411 | int ret = 0; | |
51eab943 JG |
2412 | const struct lttng_condition *condition; |
2413 | const char *session_name; | |
2414 | struct lttng_session_trigger_list *trigger_list; | |
2415 | ||
2416 | condition = lttng_trigger_get_const_condition(trigger); | |
2417 | switch (lttng_condition_get_type(condition)) { | |
2418 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2419 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2420 | { | |
2421 | enum lttng_condition_status status; | |
2422 | ||
2423 | status = lttng_condition_session_rotation_get_session_name( | |
2424 | condition, &session_name); | |
2425 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 2426 | ERR("Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); |
51eab943 JG |
2427 | ret = -1; |
2428 | goto end; | |
2429 | } | |
2430 | break; | |
2431 | } | |
2432 | default: | |
2433 | ret = -1; | |
2434 | goto end; | |
2435 | } | |
2436 | ||
ed327204 JG |
2437 | trigger_list = get_session_trigger_list(state, session_name); |
2438 | if (!trigger_list) { | |
bd0514a5 | 2439 | DBG("Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
51eab943 JG |
2440 | session_name); |
2441 | goto end; | |
51eab943 | 2442 | |
ed327204 | 2443 | } |
51eab943 | 2444 | |
bd0514a5 | 2445 | DBG("Newly registered trigger bound to session \"%s\"", |
51eab943 JG |
2446 | session_name); |
2447 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2448 | end: | |
2449 | return ret; | |
2450 | } | |
2451 | ||
2452 | /* Must be called with RCU read lock held. */ | |
2453 | static | |
f2b3ef9f | 2454 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2455 | struct notification_thread_state *state) |
2456 | { | |
2457 | int ret = 0; | |
2458 | struct cds_lfht_node *node; | |
2459 | struct cds_lfht_iter iter; | |
2460 | struct channel_info *channel; | |
2461 | ||
2462 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2463 | channels_ht_node) { | |
2464 | struct lttng_trigger_list_element *trigger_list_element; | |
2465 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2466 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2467 | |
2468 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2469 | continue; | |
2470 | } | |
2471 | ||
2472 | cds_lfht_lookup(state->channel_triggers_ht, | |
2473 | hash_channel_key(&channel->key), | |
2474 | match_channel_trigger_list, | |
2475 | &channel->key, | |
a5d64ae7 MD |
2476 | &lookup_iter); |
2477 | node = cds_lfht_iter_get_node(&lookup_iter); | |
a0377dfe | 2478 | LTTNG_ASSERT(node); |
51eab943 JG |
2479 | trigger_list = caa_container_of(node, |
2480 | struct lttng_channel_trigger_list, | |
2481 | channel_triggers_ht_node); | |
2482 | ||
2483 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2484 | if (!trigger_list_element) { | |
2485 | ret = -1; | |
2486 | goto end; | |
2487 | } | |
2488 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2489 | trigger_list_element->trigger = trigger; | |
2490 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
bd0514a5 | 2491 | DBG("Newly registered trigger bound to channel \"%s\"", |
51eab943 JG |
2492 | channel->name); |
2493 | } | |
2494 | end: | |
2495 | return ret; | |
2496 | } | |
2497 | ||
f2b3ef9f JG |
2498 | static |
2499 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2500 | { | |
2501 | bool is_notify = false; | |
2502 | unsigned int i, count; | |
2503 | enum lttng_action_status action_status; | |
2504 | const struct lttng_action *action = | |
2505 | lttng_trigger_get_const_action(trigger); | |
2506 | enum lttng_action_type action_type; | |
2507 | ||
a0377dfe | 2508 | LTTNG_ASSERT(action); |
17182cfd | 2509 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2510 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2511 | is_notify = true; | |
2512 | goto end; | |
7c2fae7c | 2513 | } else if (action_type != LTTNG_ACTION_TYPE_LIST) { |
f2b3ef9f JG |
2514 | goto end; |
2515 | } | |
2516 | ||
702f26c8 | 2517 | action_status = lttng_action_list_get_count(action, &count); |
a0377dfe | 2518 | LTTNG_ASSERT(action_status == LTTNG_ACTION_STATUS_OK); |
f2b3ef9f JG |
2519 | |
2520 | for (i = 0; i < count; i++) { | |
2521 | const struct lttng_action *inner_action = | |
702f26c8 | 2522 | lttng_action_list_get_at_index( |
f2b3ef9f JG |
2523 | action, i); |
2524 | ||
17182cfd | 2525 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2526 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2527 | is_notify = true; | |
2528 | goto end; | |
2529 | } | |
2530 | } | |
2531 | ||
2532 | end: | |
2533 | return is_notify; | |
2534 | } | |
2535 | ||
242388e4 JR |
2536 | static bool trigger_name_taken(struct notification_thread_state *state, |
2537 | const struct lttng_trigger *trigger) | |
2538 | { | |
2539 | struct cds_lfht_iter iter; | |
2540 | ||
2541 | /* | |
2542 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2543 | * The match is done against the trigger name and uid. | |
2544 | */ | |
2545 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2546 | hash_trigger_by_name_uid(trigger), | |
2547 | match_trigger_by_name_uid, | |
2548 | trigger, | |
2549 | &iter); | |
2550 | return !!cds_lfht_iter_get_node(&iter); | |
2551 | } | |
2552 | ||
2553 | static | |
2554 | enum lttng_error_code generate_trigger_name( | |
2555 | struct notification_thread_state *state, | |
2556 | struct lttng_trigger *trigger, const char **name) | |
2557 | { | |
2558 | enum lttng_error_code ret_code = LTTNG_OK; | |
2559 | bool taken = false; | |
2560 | enum lttng_trigger_status status; | |
2561 | ||
2562 | do { | |
2563 | const int ret = lttng_trigger_generate_name(trigger, | |
2564 | state->trigger_id.name_offset++); | |
2565 | if (ret) { | |
2566 | /* The only reason this can fail right now. */ | |
2567 | ret_code = LTTNG_ERR_NOMEM; | |
2568 | break; | |
2569 | } | |
2570 | ||
2571 | status = lttng_trigger_get_name(trigger, name); | |
a0377dfe | 2572 | LTTNG_ASSERT(status == LTTNG_TRIGGER_STATUS_OK); |
242388e4 JR |
2573 | |
2574 | taken = trigger_name_taken(state, trigger); | |
2575 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2576 | ||
2577 | return ret_code; | |
2578 | } | |
2579 | ||
2758e38b FD |
2580 | static inline |
2581 | void notif_thread_state_remove_trigger_ht_elem( | |
2582 | struct notification_thread_state *state, | |
2583 | struct lttng_trigger_ht_element *trigger_ht_element) | |
2584 | { | |
a0377dfe FD |
2585 | LTTNG_ASSERT(state); |
2586 | LTTNG_ASSERT(trigger_ht_element); | |
2758e38b FD |
2587 | |
2588 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2589 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); | |
2590 | } | |
2591 | ||
6487ad53 FD |
2592 | static |
2593 | enum lttng_error_code setup_tracer_notifier( | |
2594 | struct notification_thread_state *state, | |
2595 | struct lttng_trigger *trigger) | |
2596 | { | |
2597 | enum lttng_error_code ret; | |
2598 | enum event_notifier_error_accounting_status error_accounting_status; | |
2599 | struct cds_lfht_node *node; | |
2600 | uint64_t error_counter_index = 0; | |
2601 | struct lttng_condition *condition = lttng_trigger_get_condition(trigger); | |
2602 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; | |
2603 | ||
2604 | trigger_tokens_ht_element = zmalloc(sizeof(*trigger_tokens_ht_element)); | |
2605 | if (!trigger_tokens_ht_element) { | |
2606 | ret = LTTNG_ERR_NOMEM; | |
2607 | goto end; | |
2608 | } | |
2609 | ||
2610 | /* Add trigger token to the trigger_tokens_ht. */ | |
2611 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2612 | trigger_tokens_ht_element->token = LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2613 | trigger_tokens_ht_element->trigger = trigger; | |
2614 | ||
2615 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2616 | hash_key_u64(&trigger_tokens_ht_element->token, lttng_ht_seed), | |
2617 | match_trigger_token, | |
2618 | &trigger_tokens_ht_element->token, | |
2619 | &trigger_tokens_ht_element->node); | |
2620 | if (node != &trigger_tokens_ht_element->node) { | |
2621 | ret = LTTNG_ERR_TRIGGER_EXISTS; | |
2622 | goto error_free_ht_element; | |
2623 | } | |
2624 | ||
2625 | error_accounting_status = event_notifier_error_accounting_register_event_notifier( | |
2626 | trigger, &error_counter_index); | |
2627 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2628 | if (error_accounting_status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE) { | |
7c2fae7c | 2629 | DBG("Trigger list error accounting counter full."); |
6487ad53 FD |
2630 | ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING_FULL; |
2631 | } else { | |
2632 | ERR("Error registering trigger for error accounting"); | |
2633 | ret = LTTNG_ERR_EVENT_NOTIFIER_REGISTRATION; | |
2634 | } | |
2635 | ||
2636 | goto error_remove_ht_element; | |
2637 | } | |
2638 | ||
8dbb86b8 | 2639 | lttng_condition_event_rule_matches_set_error_counter_index( |
6487ad53 FD |
2640 | condition, error_counter_index); |
2641 | ||
2642 | ret = LTTNG_OK; | |
2643 | goto end; | |
2644 | ||
2645 | error_remove_ht_element: | |
2646 | cds_lfht_del(state->trigger_tokens_ht, &trigger_tokens_ht_element->node); | |
2647 | error_free_ht_element: | |
2648 | free(trigger_tokens_ht_element); | |
2649 | end: | |
2650 | return ret; | |
2651 | } | |
2652 | ||
ab0ee2ca | 2653 | /* |
f2b3ef9f | 2654 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2655 | * |
1da26331 | 2656 | * The effects of this are benign since: |
ab0ee2ca | 2657 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2658 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2659 | * - The notifications will not be sent since the client's credentials |
2660 | * are checked against the channel at that moment. | |
1da26331 JG |
2661 | * |
2662 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2663 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2664 | * |
2665 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2666 | * error code. | |
ab0ee2ca JG |
2667 | */ |
2668 | static | |
2669 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2670 | struct notification_thread_state *state, |
2671 | struct lttng_trigger *trigger, | |
0efb2ad7 | 2672 | bool is_trigger_anonymous, |
8abe313a | 2673 | enum lttng_error_code *cmd_result) |
ab0ee2ca JG |
2674 | { |
2675 | int ret = 0; | |
2676 | struct lttng_condition *condition; | |
ab0ee2ca JG |
2677 | struct notification_client_list *client_list = NULL; |
2678 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
ab0ee2ca | 2679 | struct cds_lfht_node *node; |
242388e4 | 2680 | const char* trigger_name; |
ab0ee2ca | 2681 | bool free_trigger = true; |
f2b3ef9f JG |
2682 | struct lttng_evaluation *evaluation = NULL; |
2683 | struct lttng_credentials object_creds; | |
ff588497 JR |
2684 | uid_t object_uid; |
2685 | gid_t object_gid; | |
f2b3ef9f | 2686 | enum action_executor_status executor_status; |
e6887944 JR |
2687 | const uint64_t trigger_tracer_token = |
2688 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2689 | |
2690 | rcu_read_lock(); | |
2691 | ||
e6887944 JR |
2692 | /* Set the trigger's tracer token. */ |
2693 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2694 | ||
0efb2ad7 JG |
2695 | if (!is_trigger_anonymous) { |
2696 | if (lttng_trigger_get_name(trigger, &trigger_name) == | |
2697 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2698 | const enum lttng_error_code ret_code = | |
2699 | generate_trigger_name(state, trigger, | |
2700 | &trigger_name); | |
242388e4 | 2701 | |
0efb2ad7 JG |
2702 | if (ret_code != LTTNG_OK) { |
2703 | /* Fatal error. */ | |
2704 | ret = -1; | |
2705 | *cmd_result = ret_code; | |
2706 | goto error; | |
2707 | } | |
2708 | } else if (trigger_name_taken(state, trigger)) { | |
2709 | /* Not a fatal error. */ | |
2710 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2711 | ret = 0; | |
242388e4 JR |
2712 | goto error; |
2713 | } | |
0efb2ad7 JG |
2714 | } else { |
2715 | trigger_name = "(anonymous)"; | |
242388e4 JR |
2716 | } |
2717 | ||
ab0ee2ca | 2718 | condition = lttng_trigger_get_condition(trigger); |
a0377dfe | 2719 | LTTNG_ASSERT(condition); |
1da26331 | 2720 | |
959e3c66 JR |
2721 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2722 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2723 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2724 | goto error; | |
1da26331 JG |
2725 | } |
2726 | ||
ab0ee2ca JG |
2727 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2728 | if (!trigger_ht_element) { | |
2729 | ret = -1; | |
2730 | goto error; | |
2731 | } | |
2732 | ||
2733 | /* Add trigger to the trigger_ht. */ | |
2734 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2735 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2736 | trigger_ht_element->trigger = trigger; |
2737 | ||
2738 | node = cds_lfht_add_unique(state->triggers_ht, | |
2739 | lttng_condition_hash(condition), | |
242388e4 JR |
2740 | match_trigger, |
2741 | trigger, | |
ab0ee2ca JG |
2742 | &trigger_ht_element->node); |
2743 | if (node != &trigger_ht_element->node) { | |
2744 | /* Not a fatal error, simply report it to the client. */ | |
2745 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2746 | goto error_free_ht_element; | |
2747 | } | |
2748 | ||
242388e4 JR |
2749 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2750 | hash_trigger_by_name_uid(trigger), | |
2751 | match_trigger_by_name_uid, | |
2752 | trigger, | |
2753 | &trigger_ht_element->node_by_name_uid); | |
2754 | if (node != &trigger_ht_element->node_by_name_uid) { | |
75e540c6 JG |
2755 | /* Internal error: add to triggers_ht should have failed. */ |
2756 | ret = -1; | |
242388e4 JR |
2757 | goto error_free_ht_element; |
2758 | } | |
2759 | ||
9c374932 JR |
2760 | /* From this point consider the trigger registered. */ |
2761 | lttng_trigger_set_as_registered(trigger); | |
2762 | ||
6487ad53 FD |
2763 | /* |
2764 | * Some triggers might need a tracer notifier depending on its | |
2765 | * condition and actions. | |
2766 | */ | |
2767 | if (lttng_trigger_needs_tracer_notifier(trigger)) { | |
2768 | enum lttng_error_code error_code; | |
e7c93cf9 | 2769 | |
6487ad53 FD |
2770 | error_code = setup_tracer_notifier(state, trigger); |
2771 | if (error_code != LTTNG_OK) { | |
2758e38b FD |
2772 | notif_thread_state_remove_trigger_ht_elem(state, |
2773 | trigger_ht_element); | |
6487ad53 FD |
2774 | if (error_code == LTTNG_ERR_NOMEM) { |
2775 | ret = -1; | |
2776 | } else { | |
2777 | *cmd_result = error_code; | |
2778 | ret = 0; | |
90aa04a1 FD |
2779 | } |
2780 | ||
6487ad53 | 2781 | goto error_free_ht_element; |
90aa04a1 | 2782 | } |
e7c93cf9 JR |
2783 | } |
2784 | ||
ab0ee2ca JG |
2785 | /* |
2786 | * The rest only applies to triggers that have a "notify" action. | |
2787 | * It is not skipped as this is the only action type currently | |
2788 | * supported. | |
2789 | */ | |
f2b3ef9f | 2790 | if (is_trigger_action_notify(trigger)) { |
091fa780 FD |
2791 | /* |
2792 | * Find or create the client list of this condition. It may | |
2793 | * already be present if another trigger is already registered | |
2794 | * with the same condition. | |
2795 | */ | |
2796 | client_list = get_client_list_from_condition(state, condition); | |
f2b3ef9f | 2797 | if (!client_list) { |
091fa780 FD |
2798 | /* |
2799 | * No client list for this condition yet. We create new | |
2800 | * one and build it up. | |
2801 | */ | |
2802 | client_list = notification_client_list_create(state, condition); | |
2803 | if (!client_list) { | |
2804 | ERR("Error creating notification client list for trigger %s", trigger->name); | |
2805 | goto error_free_ht_element; | |
f2b3ef9f | 2806 | } |
ab0ee2ca | 2807 | } |
f2b3ef9f | 2808 | |
091fa780 FD |
2809 | CDS_INIT_LIST_HEAD(&trigger_ht_element->client_list_trigger_node); |
2810 | ||
2811 | pthread_mutex_lock(&client_list->lock); | |
2812 | cds_list_add(&trigger_ht_element->client_list_trigger_node, &client_list->triggers_list); | |
2813 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca JG |
2814 | } |
2815 | ||
091fa780 FD |
2816 | /* |
2817 | * Ownership of the trigger and of its wrapper was transfered to | |
2818 | * the triggers_ht. Same for token ht element if necessary. | |
2819 | */ | |
2820 | trigger_ht_element = NULL; | |
2821 | free_trigger = false; | |
2822 | ||
f82f93a1 | 2823 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2824 | case LTTNG_OBJECT_TYPE_SESSION: |
2825 | /* Add the trigger to the list if it matches a known session. */ | |
2826 | ret = bind_trigger_to_matching_session(trigger, state); | |
2827 | if (ret) { | |
091fa780 | 2828 | goto error_free_ht_element; |
ab0ee2ca | 2829 | } |
f82f93a1 | 2830 | break; |
51eab943 JG |
2831 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2832 | /* | |
2833 | * Add the trigger to list of triggers bound to the channels | |
2834 | * currently known. | |
2835 | */ | |
2836 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2837 | if (ret) { | |
091fa780 | 2838 | goto error_free_ht_element; |
ab0ee2ca | 2839 | } |
51eab943 JG |
2840 | break; |
2841 | case LTTNG_OBJECT_TYPE_NONE: | |
2842 | break; | |
2843 | default: | |
f2b3ef9f | 2844 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2845 | ret = -1; |
091fa780 | 2846 | goto error_free_ht_element; |
ab0ee2ca JG |
2847 | } |
2848 | ||
2ae99f0b | 2849 | /* |
f2b3ef9f JG |
2850 | * The new trigger's condition must be evaluated against the current |
2851 | * state. | |
2852 | * | |
2853 | * In the case of `notify` action, nothing preventing clients from | |
2854 | * subscribing to a condition before the corresponding trigger is | |
2855 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2856 | * |
2857 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2858 | * reception of a channel sample) to evaluate this new condition, but | |
2859 | * that was broken. | |
2860 | * | |
2861 | * The reason it was broken is that waiting for the next sample | |
2862 | * does not allow us to properly handle transitions for edge-triggered | |
2863 | * conditions. | |
2864 | * | |
2865 | * Consider this example: when we handle a new channel sample, we | |
2866 | * evaluate each conditions twice: once with the previous state, and | |
2867 | * again with the newest state. We then use those two results to | |
2868 | * determine whether a state change happened: a condition was false and | |
2869 | * became true. If a state change happened, we have to notify clients. | |
2870 | * | |
2871 | * Now, if a client subscribes to a given notification and registers | |
2872 | * a trigger *after* that subscription, we have to make sure the | |
2873 | * condition is evaluated at this point while considering only the | |
2874 | * current state. Otherwise, the next evaluation cycle may only see | |
2875 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2876 | * the client will never know that the condition has been met. | |
2877 | */ | |
f2b3ef9f JG |
2878 | switch (get_condition_binding_object(condition)) { |
2879 | case LTTNG_OBJECT_TYPE_SESSION: | |
2880 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2881 | &evaluation, &object_uid, |
2882 | &object_gid); | |
bc8daafb JG |
2883 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2884 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2885 | break; |
f2b3ef9f JG |
2886 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2887 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2888 | &evaluation, &object_uid, |
2889 | &object_gid); | |
bc8daafb JG |
2890 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2891 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2892 | break; |
2893 | case LTTNG_OBJECT_TYPE_NONE: | |
2894 | ret = 0; | |
242388e4 | 2895 | break; |
f2b3ef9f JG |
2896 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2897 | default: | |
2898 | ret = -1; | |
242388e4 | 2899 | break; |
f2b3ef9f JG |
2900 | } |
2901 | ||
2902 | if (ret) { | |
2903 | /* Fatal error. */ | |
091fa780 | 2904 | goto error_free_ht_element; |
f2b3ef9f JG |
2905 | } |
2906 | ||
2907 | DBG("Newly registered trigger's condition evaluated to %s", | |
2908 | evaluation ? "true" : "false"); | |
2909 | if (!evaluation) { | |
2910 | /* Evaluation yielded nothing. Normal exit. */ | |
2911 | ret = 0; | |
091fa780 | 2912 | goto success; |
2ae99f0b JG |
2913 | } |
2914 | ||
2915 | /* | |
f2b3ef9f JG |
2916 | * Ownership of `evaluation` transferred to the action executor |
2917 | * no matter the result. | |
2ae99f0b | 2918 | */ |
72365501 JR |
2919 | executor_status = action_executor_enqueue_trigger(state->executor, |
2920 | trigger, evaluation, &object_creds, client_list); | |
f2b3ef9f JG |
2921 | evaluation = NULL; |
2922 | switch (executor_status) { | |
2923 | case ACTION_EXECUTOR_STATUS_OK: | |
2924 | break; | |
2925 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2926 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2927 | /* | |
2928 | * TODO Add trigger identification (name/id) when | |
2929 | * it is added to the API. | |
2930 | */ | |
2931 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2932 | ret = -1; | |
091fa780 | 2933 | goto error_free_ht_element; |
f2b3ef9f JG |
2934 | case ACTION_EXECUTOR_STATUS_OVERFLOW: |
2935 | /* | |
2936 | * TODO Add trigger identification (name/id) when | |
2937 | * it is added to the API. | |
2938 | * | |
2939 | * Not a fatal error. | |
2940 | */ | |
2941 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2942 | ret = 0; | |
091fa780 | 2943 | goto success; |
f2b3ef9f JG |
2944 | default: |
2945 | abort(); | |
2946 | } | |
2ae99f0b | 2947 | |
091fa780 | 2948 | success: |
ab0ee2ca | 2949 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2950 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2951 | trigger_name, trigger_tracer_token); | |
091fa780 | 2952 | goto end; |
505b2d90 | 2953 | |
ab0ee2ca | 2954 | error_free_ht_element: |
242388e4 JR |
2955 | if (trigger_ht_element) { |
2956 | /* Delayed removal due to RCU constraint on delete. */ | |
2957 | call_rcu(&trigger_ht_element->rcu_node, | |
2958 | free_lttng_trigger_ht_element_rcu); | |
2959 | } | |
ab0ee2ca JG |
2960 | error: |
2961 | if (free_trigger) { | |
9c374932 JR |
2962 | /* |
2963 | * Other objects might have a reference to the trigger, mark it | |
2964 | * as unregistered. | |
2965 | */ | |
2966 | lttng_trigger_set_as_unregistered(trigger); | |
ab0ee2ca JG |
2967 | lttng_trigger_destroy(trigger); |
2968 | } | |
091fa780 | 2969 | end: |
ab0ee2ca JG |
2970 | rcu_read_unlock(); |
2971 | return ret; | |
2972 | } | |
2973 | ||
83b934ad MD |
2974 | static |
2975 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2976 | { | |
2977 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2978 | rcu_node)); | |
2979 | } | |
2980 | ||
e7c93cf9 JR |
2981 | static |
2982 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
2983 | { | |
2984 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
2985 | rcu_node)); | |
2986 | } | |
2987 | ||
6487ad53 FD |
2988 | static |
2989 | void teardown_tracer_notifier(struct notification_thread_state *state, | |
2990 | const struct lttng_trigger *trigger) | |
2991 | { | |
2992 | struct cds_lfht_iter iter; | |
2993 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element; | |
2994 | ||
2995 | cds_lfht_for_each_entry(state->trigger_tokens_ht, &iter, | |
2996 | trigger_tokens_ht_element, node) { | |
2997 | ||
2998 | if (!lttng_trigger_is_equal(trigger, | |
2999 | trigger_tokens_ht_element->trigger)) { | |
3000 | continue; | |
3001 | } | |
3002 | ||
3003 | event_notifier_error_accounting_unregister_event_notifier( | |
3004 | trigger_tokens_ht_element->trigger); | |
3005 | ||
3006 | /* TODO talk to all app and remove it */ | |
bd0514a5 | 3007 | DBG("Removed trigger from tokens_ht"); |
6487ad53 FD |
3008 | cds_lfht_del(state->trigger_tokens_ht, |
3009 | &trigger_tokens_ht_element->node); | |
3010 | ||
3011 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
3012 | free_notification_trigger_tokens_ht_element_rcu); | |
3013 | ||
3014 | break; | |
3015 | } | |
3016 | } | |
3017 | ||
cc2295b5 | 3018 | static |
ab0ee2ca JG |
3019 | int handle_notification_thread_command_unregister_trigger( |
3020 | struct notification_thread_state *state, | |
ac16173e | 3021 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
3022 | enum lttng_error_code *_cmd_reply) |
3023 | { | |
3024 | struct cds_lfht_iter iter; | |
ed327204 | 3025 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
3026 | struct lttng_channel_trigger_list *trigger_list; |
3027 | struct notification_client_list *client_list; | |
ab0ee2ca | 3028 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 3029 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 3030 | trigger); |
ab0ee2ca JG |
3031 | enum lttng_error_code cmd_reply; |
3032 | ||
3033 | rcu_read_lock(); | |
3034 | ||
3035 | cds_lfht_lookup(state->triggers_ht, | |
3036 | lttng_condition_hash(condition), | |
242388e4 JR |
3037 | match_trigger, |
3038 | trigger, | |
ab0ee2ca JG |
3039 | &iter); |
3040 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
3041 | if (!triggers_ht_node) { | |
3042 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
3043 | goto end; | |
3044 | } else { | |
3045 | cmd_reply = LTTNG_OK; | |
3046 | } | |
3047 | ||
9c374932 JR |
3048 | trigger_ht_element = caa_container_of(triggers_ht_node, |
3049 | struct lttng_trigger_ht_element, node); | |
3050 | ||
ab0ee2ca JG |
3051 | /* Remove trigger from channel_triggers_ht. */ |
3052 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
3053 | channel_triggers_ht_node) { | |
3054 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
3055 | ||
3056 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
3057 | &trigger_list->list, node) { | |
e8f7fa11 | 3058 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
3059 | continue; |
3060 | } | |
3061 | ||
bd0514a5 | 3062 | DBG("Removed trigger from channel_triggers_ht"); |
ab0ee2ca | 3063 | cds_list_del(&trigger_element->node); |
e4db5ace JR |
3064 | /* A trigger can only appear once per channel */ |
3065 | break; | |
ab0ee2ca JG |
3066 | } |
3067 | } | |
3068 | ||
6487ad53 FD |
3069 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
3070 | teardown_tracer_notifier(state, trigger); | |
e7c93cf9 JR |
3071 | } |
3072 | ||
51367634 JR |
3073 | if (is_trigger_action_notify(trigger)) { |
3074 | /* | |
3075 | * Remove and release the client list from | |
3076 | * notification_trigger_clients_ht. | |
3077 | */ | |
3078 | client_list = get_client_list_from_condition(state, condition); | |
a0377dfe | 3079 | LTTNG_ASSERT(client_list); |
ed327204 | 3080 | |
091fa780 FD |
3081 | pthread_mutex_lock(&client_list->lock); |
3082 | cds_list_del(&trigger_ht_element->client_list_trigger_node); | |
3083 | pthread_mutex_unlock(&client_list->lock); | |
3084 | ||
51367634 JR |
3085 | /* Put new reference and the hashtable's reference. */ |
3086 | notification_client_list_put(client_list); | |
3087 | notification_client_list_put(client_list); | |
3088 | client_list = NULL; | |
3089 | } | |
ab0ee2ca | 3090 | |
2758e38b FD |
3091 | /* Remove trigger from triggers_ht. */ |
3092 | notif_thread_state_remove_trigger_ht_elem(state, trigger_ht_element); | |
ab0ee2ca | 3093 | |
7ca172c1 | 3094 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 3095 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 3096 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
3097 | end: |
3098 | rcu_read_unlock(); | |
3099 | if (_cmd_reply) { | |
3100 | *_cmd_reply = cmd_reply; | |
3101 | } | |
3102 | return 0; | |
3103 | } | |
3104 | ||
3105 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
3106 | int handle_notification_thread_command( | |
3107 | struct notification_thread_handle *handle, | |
3108 | struct notification_thread_state *state) | |
3109 | { | |
3110 | int ret; | |
3111 | uint64_t counter; | |
3112 | struct notification_thread_command *cmd; | |
3113 | ||
8abe313a | 3114 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 3115 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 3116 | sizeof(counter)); |
18aeca05 | 3117 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
3118 | goto error; |
3119 | } | |
3120 | ||
3121 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
3122 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
3123 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
3124 | cds_list_del(&cmd->cmd_list_node); |
3125 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
6900ae81 | 3126 | |
bd0514a5 | 3127 | DBG("Received `%s` command", |
6900ae81 | 3128 | notification_command_type_str(cmd->type)); |
ab0ee2ca JG |
3129 | switch (cmd->type) { |
3130 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
3131 | ret = handle_notification_thread_command_register_trigger(state, |
3132 | cmd->parameters.register_trigger.trigger, | |
0efb2ad7 | 3133 | cmd->parameters.register_trigger.is_trigger_anonymous, |
ab0ee2ca JG |
3134 | &cmd->reply_code); |
3135 | break; | |
3136 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 3137 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
3138 | state, |
3139 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
3140 | &cmd->reply_code); |
3141 | break; | |
3142 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 3143 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
3144 | state, |
3145 | cmd->parameters.add_channel.session.name, | |
3146 | cmd->parameters.add_channel.session.uid, | |
3147 | cmd->parameters.add_channel.session.gid, | |
3148 | cmd->parameters.add_channel.channel.name, | |
3149 | cmd->parameters.add_channel.channel.domain, | |
3150 | cmd->parameters.add_channel.channel.key, | |
3151 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
3152 | &cmd->reply_code); |
3153 | break; | |
3154 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
3155 | ret = handle_notification_thread_command_remove_channel( |
3156 | state, cmd->parameters.remove_channel.key, | |
3157 | cmd->parameters.remove_channel.domain, | |
3158 | &cmd->reply_code); | |
3159 | break; | |
0ca52944 | 3160 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 3161 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 3162 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 3163 | state, |
ed327204 JG |
3164 | cmd->type, |
3165 | cmd->parameters.session_rotation.session_name, | |
3166 | cmd->parameters.session_rotation.uid, | |
3167 | cmd->parameters.session_rotation.gid, | |
3168 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
3169 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
3170 | &cmd->reply_code); |
3171 | break; | |
d02d7404 JR |
3172 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
3173 | ret = handle_notification_thread_command_add_tracer_event_source( | |
3174 | state, | |
3175 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3176 | cmd->parameters.tracer_event_source.domain, | |
3177 | &cmd->reply_code); | |
3178 | break; | |
3179 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
3180 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
3181 | state, | |
3182 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3183 | &cmd->reply_code); | |
3184 | break; | |
fbc9f37d JR |
3185 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
3186 | { | |
3187 | struct lttng_triggers *triggers = NULL; | |
3188 | ||
3189 | ret = handle_notification_thread_command_list_triggers( | |
3190 | handle, | |
3191 | state, | |
3192 | cmd->parameters.list_triggers.uid, | |
3193 | &triggers, | |
3194 | &cmd->reply_code); | |
3195 | cmd->reply.list_triggers.triggers = triggers; | |
3196 | ret = 0; | |
3197 | break; | |
3198 | } | |
ab0ee2ca | 3199 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
3200 | cmd->reply_code = LTTNG_OK; |
3201 | ret = 1; | |
3202 | goto end; | |
8790759c FD |
3203 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
3204 | { | |
3205 | struct lttng_trigger *trigger = NULL; | |
3206 | ||
3207 | ret = handle_notification_thread_command_get_trigger(state, | |
3208 | cmd->parameters.get_trigger.trigger, &trigger, | |
3209 | &cmd->reply_code); | |
3210 | cmd->reply.get_trigger.trigger = trigger; | |
3211 | break; | |
3212 | } | |
f2b3ef9f JG |
3213 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
3214 | { | |
3215 | const enum client_transmission_status client_status = | |
3216 | cmd->parameters.client_communication_update | |
3217 | .status; | |
3218 | const notification_client_id client_id = | |
3219 | cmd->parameters.client_communication_update.id; | |
3220 | struct notification_client *client; | |
3221 | ||
3222 | rcu_read_lock(); | |
3223 | client = get_client_from_id(client_id, state); | |
3224 | ||
3225 | if (!client) { | |
3226 | /* | |
3227 | * Client error was probably already picked-up by the | |
3228 | * notification thread or it has disconnected | |
3229 | * gracefully while this command was queued. | |
3230 | */ | |
3231 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
3232 | client_id); | |
3233 | ret = 0; | |
3234 | } else { | |
f2b3ef9f JG |
3235 | ret = client_handle_transmission_status( |
3236 | client, client_status, state); | |
f2b3ef9f JG |
3237 | } |
3238 | rcu_read_unlock(); | |
3239 | break; | |
3240 | } | |
ab0ee2ca | 3241 | default: |
bd0514a5 | 3242 | ERR("Unknown internal command received"); |
ab0ee2ca JG |
3243 | goto error_unlock; |
3244 | } | |
3245 | ||
3246 | if (ret) { | |
3247 | goto error_unlock; | |
3248 | } | |
3249 | end: | |
0ab399e0 JG |
3250 | if (cmd->is_async) { |
3251 | free(cmd); | |
3252 | cmd = NULL; | |
3253 | } else { | |
3254 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3255 | } | |
ab0ee2ca JG |
3256 | return ret; |
3257 | error_unlock: | |
3258 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3259 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3260 | cmd->reply_code = LTTNG_ERR_FATAL; |
3261 | error: | |
3262 | /* Indicate a fatal error to the caller. */ | |
3263 | return -1; | |
3264 | } | |
3265 | ||
ab0ee2ca JG |
3266 | static |
3267 | int socket_set_non_blocking(int socket) | |
3268 | { | |
3269 | int ret, flags; | |
3270 | ||
3271 | /* Set the pipe as non-blocking. */ | |
3272 | ret = fcntl(socket, F_GETFL, 0); | |
3273 | if (ret == -1) { | |
3274 | PERROR("fcntl get socket flags"); | |
3275 | goto end; | |
3276 | } | |
3277 | flags = ret; | |
3278 | ||
3279 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3280 | if (ret == -1) { | |
3281 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3282 | goto end; | |
3283 | } | |
3284 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3285 | end: | |
3286 | return ret; | |
3287 | } | |
3288 | ||
3289 | static | |
14fa22f8 | 3290 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3291 | { |
3292 | int ret; | |
3293 | ||
882093ee JR |
3294 | |
3295 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3296 | |
3297 | client->communication.inbound.bytes_to_receive = | |
3298 | sizeof(struct lttng_notification_channel_message); | |
3299 | client->communication.inbound.msg_type = | |
3300 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3301 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3302 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3303 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3304 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3305 | client->communication.inbound.bytes_to_receive); |
882093ee | 3306 | |
14fa22f8 | 3307 | return ret; |
ab0ee2ca JG |
3308 | } |
3309 | ||
3310 | int handle_notification_thread_client_connect( | |
3311 | struct notification_thread_state *state) | |
3312 | { | |
3313 | int ret; | |
3314 | struct notification_client *client; | |
3315 | ||
bd0514a5 | 3316 | DBG("Handling new notification channel client connection"); |
ab0ee2ca JG |
3317 | |
3318 | client = zmalloc(sizeof(*client)); | |
3319 | if (!client) { | |
3320 | /* Fatal error. */ | |
3321 | ret = -1; | |
3322 | goto error; | |
3323 | } | |
6c24d3fd | 3324 | |
505b2d90 | 3325 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3326 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3327 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3328 | lttng_payload_init(&client->communication.inbound.payload); |
3329 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3330 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3331 | |
14fa22f8 JG |
3332 | ret = client_reset_inbound_state(client); |
3333 | if (ret) { | |
bd0514a5 | 3334 | ERR("Failed to reset client communication's inbound state"); |
e742b055 | 3335 | ret = 0; |
14fa22f8 JG |
3336 | goto error; |
3337 | } | |
ab0ee2ca JG |
3338 | |
3339 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3340 | if (ret < 0) { | |
bd0514a5 | 3341 | ERR("Failed to accept new notification channel client connection"); |
ab0ee2ca JG |
3342 | ret = 0; |
3343 | goto error; | |
3344 | } | |
3345 | ||
3346 | client->socket = ret; | |
3347 | ||
3348 | ret = socket_set_non_blocking(client->socket); | |
3349 | if (ret) { | |
bd0514a5 | 3350 | ERR("Failed to set new notification channel client connection socket as non-blocking"); |
ab0ee2ca JG |
3351 | goto error; |
3352 | } | |
3353 | ||
3354 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3355 | if (ret < 0) { | |
bd0514a5 | 3356 | ERR("Failed to set socket options on new notification channel client socket"); |
ab0ee2ca JG |
3357 | ret = 0; |
3358 | goto error; | |
3359 | } | |
3360 | ||
3361 | ret = lttng_poll_add(&state->events, client->socket, | |
3362 | LPOLLIN | LPOLLERR | | |
3363 | LPOLLHUP | LPOLLRDHUP); | |
3364 | if (ret < 0) { | |
bd0514a5 | 3365 | ERR("Failed to add notification channel client socket to poll set"); |
ab0ee2ca JG |
3366 | ret = 0; |
3367 | goto error; | |
3368 | } | |
bd0514a5 | 3369 | DBG("Added new notification channel client socket (%i) to poll set", |
ab0ee2ca JG |
3370 | client->socket); |
3371 | ||
ab0ee2ca JG |
3372 | rcu_read_lock(); |
3373 | cds_lfht_add(state->client_socket_ht, | |
3374 | hash_client_socket(client->socket), | |
3375 | &client->client_socket_ht_node); | |
ac1889bf JG |
3376 | cds_lfht_add(state->client_id_ht, |
3377 | hash_client_id(client->id), | |
3378 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3379 | rcu_read_unlock(); |
3380 | ||
3381 | return ret; | |
6c24d3fd | 3382 | |
ab0ee2ca JG |
3383 | error: |
3384 | notification_client_destroy(client, state); | |
3385 | return ret; | |
3386 | } | |
3387 | ||
6c24d3fd JG |
3388 | /* |
3389 | * RCU read-lock must be held by the caller. | |
3390 | * Client lock must _not_ be held by the caller. | |
3391 | */ | |
505b2d90 JG |
3392 | static |
3393 | int notification_thread_client_disconnect( | |
3394 | struct notification_client *client, | |
ab0ee2ca | 3395 | struct notification_thread_state *state) |
505b2d90 JG |
3396 | { |
3397 | int ret; | |
3398 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3399 | ||
3400 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 3401 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3402 | client->communication.active = false; |
6c24d3fd JG |
3403 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3404 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3405 | pthread_mutex_unlock(&client->lock); | |
3406 | ||
505b2d90 JG |
3407 | ret = lttng_poll_del(&state->events, client->socket); |
3408 | if (ret) { | |
bd0514a5 | 3409 | ERR("Failed to remove client socket %d from poll set", |
505b2d90 JG |
3410 | client->socket); |
3411 | } | |
3412 | ||
505b2d90 JG |
3413 | /* Release all conditions to which the client was subscribed. */ |
3414 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3415 | &client->condition_list, node) { | |
3416 | (void) notification_thread_client_unsubscribe(client, | |
3417 | condition_list_element->condition, state, NULL); | |
3418 | } | |
3419 | ||
3420 | /* | |
3421 | * Client no longer accessible to other threads (through the | |
3422 | * client lists). | |
3423 | */ | |
3424 | notification_client_destroy(client, state); | |
3425 | return ret; | |
3426 | } | |
3427 | ||
3428 | int handle_notification_thread_client_disconnect( | |
3429 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3430 | { |
3431 | int ret = 0; | |
3432 | struct notification_client *client; | |
3433 | ||
3434 | rcu_read_lock(); | |
bd0514a5 | 3435 | DBG("Closing client connection (socket fd = %i)", |
ab0ee2ca JG |
3436 | client_socket); |
3437 | client = get_client_from_socket(client_socket, state); | |
3438 | if (!client) { | |
3439 | /* Internal state corruption, fatal error. */ | |
bd0514a5 | 3440 | ERR("Unable to find client (socket fd = %i)", |
ab0ee2ca JG |
3441 | client_socket); |
3442 | ret = -1; | |
3443 | goto end; | |
3444 | } | |
3445 | ||
505b2d90 | 3446 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3447 | end: |
3448 | rcu_read_unlock(); | |
3449 | return ret; | |
3450 | } | |
3451 | ||
3452 | int handle_notification_thread_client_disconnect_all( | |
3453 | struct notification_thread_state *state) | |
3454 | { | |
3455 | struct cds_lfht_iter iter; | |
3456 | struct notification_client *client; | |
3457 | bool error_encoutered = false; | |
3458 | ||
3459 | rcu_read_lock(); | |
bd0514a5 | 3460 | DBG("Closing all client connections"); |
ab0ee2ca | 3461 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, |
505b2d90 | 3462 | client_socket_ht_node) { |
ab0ee2ca JG |
3463 | int ret; |
3464 | ||
505b2d90 JG |
3465 | ret = notification_thread_client_disconnect( |
3466 | client, state); | |
ab0ee2ca JG |
3467 | if (ret) { |
3468 | error_encoutered = true; | |
3469 | } | |
3470 | } | |
3471 | rcu_read_unlock(); | |
3472 | return error_encoutered ? 1 : 0; | |
3473 | } | |
3474 | ||
3475 | int handle_notification_thread_trigger_unregister_all( | |
3476 | struct notification_thread_state *state) | |
3477 | { | |
4149ace8 | 3478 | bool error_occurred = false; |
ab0ee2ca JG |
3479 | struct cds_lfht_iter iter; |
3480 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3481 | ||
763de384 | 3482 | rcu_read_lock(); |
ab0ee2ca JG |
3483 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3484 | node) { | |
3485 | int ret = handle_notification_thread_command_unregister_trigger( | |
3486 | state, trigger_ht_element->trigger, NULL); | |
3487 | if (ret) { | |
4149ace8 | 3488 | error_occurred = true; |
ab0ee2ca JG |
3489 | } |
3490 | } | |
763de384 | 3491 | rcu_read_unlock(); |
4149ace8 | 3492 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3493 | } |
3494 | ||
dd877ea6 JG |
3495 | static |
3496 | int client_handle_transmission_status( | |
3497 | struct notification_client *client, | |
3498 | enum client_transmission_status transmission_status, | |
3499 | struct notification_thread_state *state) | |
3500 | { | |
3501 | int ret = 0; | |
3502 | ||
3503 | switch (transmission_status) { | |
3504 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3505 | ret = lttng_poll_mod(&state->events, client->socket, | |
3506 | CLIENT_POLL_MASK_IN); | |
3507 | if (ret) { | |
3508 | goto end; | |
3509 | } | |
3510 | ||
dd877ea6 JG |
3511 | break; |
3512 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3513 | /* | |
3514 | * We want to be notified whenever there is buffer space | |
3515 | * available to send the rest of the payload. | |
3516 | */ | |
3517 | ret = lttng_poll_mod(&state->events, client->socket, | |
3518 | CLIENT_POLL_MASK_IN_OUT); | |
3519 | if (ret) { | |
3520 | goto end; | |
3521 | } | |
3522 | break; | |
3523 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3524 | ret = notification_thread_client_disconnect(client, state); | |
3525 | if (ret) { | |
3526 | goto end; | |
3527 | } | |
3528 | break; | |
3529 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3530 | ret = -1; | |
3531 | goto end; | |
3532 | default: | |
3533 | abort(); | |
3534 | } | |
3535 | end: | |
3536 | return ret; | |
3537 | } | |
3538 | ||
505b2d90 | 3539 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3540 | static |
dd877ea6 | 3541 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3542 | struct notification_client *client) |
ab0ee2ca JG |
3543 | { |
3544 | ssize_t ret; | |
3545 | size_t to_send_count; | |
dd877ea6 | 3546 | enum client_transmission_status status; |
882093ee JR |
3547 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3548 | &client->communication.outbound.payload, 0, -1); | |
3549 | const int fds_to_send_count = | |
3550 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3551 | |
505b2d90 JG |
3552 | ASSERT_LOCKED(client->lock); |
3553 | ||
f2b3ef9f JG |
3554 | if (!client->communication.active) { |
3555 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3556 | goto end; | |
3557 | } | |
3558 | ||
882093ee JR |
3559 | if (pv.buffer.size == 0) { |
3560 | /* | |
3561 | * If both data and fds are equal to zero, we are in an invalid | |
3562 | * state. | |
3563 | */ | |
a0377dfe | 3564 | LTTNG_ASSERT(fds_to_send_count != 0); |
882093ee JR |
3565 | goto send_fds; |
3566 | } | |
3567 | ||
3568 | /* Send data. */ | |
3569 | to_send_count = pv.buffer.size; | |
bd0514a5 | 3570 | DBG("Flushing client (socket fd = %i) outgoing queue", |
ab0ee2ca JG |
3571 | client->socket); |
3572 | ||
3573 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3574 | pv.buffer.data, |
ab0ee2ca | 3575 | to_send_count); |
44c180ca | 3576 | if ((ret >= 0 && ret < to_send_count)) { |
bd0514a5 | 3577 | DBG("Client (socket fd = %i) outgoing queue could not be completely flushed", |
ab0ee2ca JG |
3578 | client->socket); |
3579 | to_send_count -= max(ret, 0); | |
3580 | ||
6f110534 | 3581 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3582 | pv.buffer.data + |
3583 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3584 | to_send_count); |
3585 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3586 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3587 | to_send_count); |
3588 | if (ret) { | |
3589 | goto error; | |
3590 | } | |
6c24d3fd | 3591 | |
dd877ea6 | 3592 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3593 | goto end; |
ab0ee2ca | 3594 | } else if (ret < 0) { |
6c24d3fd | 3595 | /* Generic error, disable the client's communication. */ |
bd0514a5 | 3596 | ERR("Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3597 | client->socket); |
6c24d3fd | 3598 | client->communication.active = false; |
dd877ea6 | 3599 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3600 | goto end; |
ab0ee2ca | 3601 | } else { |
882093ee JR |
3602 | /* |
3603 | * No error and flushed the queue completely. | |
3604 | * | |
3605 | * The payload buffer size is used later to | |
3606 | * check if there is notifications queued. So albeit that the | |
3607 | * direct caller knows that the transmission is complete, we | |
3608 | * need to set the buffer size to zero. | |
3609 | */ | |
ab0ee2ca | 3610 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3611 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3612 | if (ret) { |
3613 | goto error; | |
3614 | } | |
882093ee | 3615 | } |
6c24d3fd | 3616 | |
882093ee JR |
3617 | send_fds: |
3618 | /* No fds to send, transmission is complete. */ | |
3619 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3620 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3621 | goto end; |
dd877ea6 | 3622 | } |
882093ee JR |
3623 | |
3624 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3625 | client->socket, &pv); | |
3626 | if (ret < 0) { | |
3627 | /* Generic error, disable the client's communication. */ | |
bd0514a5 | 3628 | ERR("Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", |
882093ee JR |
3629 | client->socket); |
3630 | client->communication.active = false; | |
3631 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3632 | goto end; | |
3633 | } else if (ret == 0) { | |
3634 | /* Nothing could be sent. */ | |
3635 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3636 | } else { | |
3637 | /* Fd passing is an all or nothing kind of thing. */ | |
3638 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3639 | /* | |
3640 | * The payload _fd_array count is used later to | |
3641 | * check if there is notifications queued. So although the | |
3642 | * direct caller knows that the transmission is complete, we | |
3643 | * need to clear the _fd_array for the queuing check. | |
3644 | */ | |
3645 | lttng_dynamic_pointer_array_clear( | |
3646 | &client->communication.outbound.payload | |
3647 | ._fd_handles); | |
3648 | } | |
3649 | ||
f2b3ef9f | 3650 | end: |
882093ee JR |
3651 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3652 | client->communication.outbound.queued_command_reply = false; | |
3653 | client->communication.outbound.dropped_notification = false; | |
3654 | lttng_payload_clear(&client->communication.outbound.payload); | |
3655 | } | |
3656 | ||
f2b3ef9f | 3657 | return status; |
ab0ee2ca | 3658 | error: |
f2b3ef9f | 3659 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3660 | } |
3661 | ||
882093ee JR |
3662 | static |
3663 | bool client_has_outbound_data_left( | |
3664 | const struct notification_client *client) | |
3665 | { | |
3666 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3667 | &client->communication.outbound.payload, 0, -1); | |
3668 | const bool has_data = pv.buffer.size != 0; | |
3669 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3670 | ||
3671 | return has_data || has_fds; | |
3672 | } | |
3673 | ||
6c24d3fd | 3674 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3675 | static |
3676 | int client_send_command_reply(struct notification_client *client, | |
3677 | struct notification_thread_state *state, | |
3678 | enum lttng_notification_channel_status status) | |
3679 | { | |
3680 | int ret; | |
3681 | struct lttng_notification_channel_command_reply reply = { | |
3682 | .status = (int8_t) status, | |
3683 | }; | |
3684 | struct lttng_notification_channel_message msg = { | |
3685 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3686 | .size = sizeof(reply), | |
3687 | }; | |
3688 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3689 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3690 | |
6c24d3fd JG |
3691 | memcpy(buffer, &msg, sizeof(msg)); |
3692 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
bd0514a5 | 3693 | DBG("Send command reply (%i)", (int) status); |
505b2d90 | 3694 | |
6c24d3fd | 3695 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3696 | if (client->communication.outbound.queued_command_reply) { |
3697 | /* Protocol error. */ | |
6c24d3fd | 3698 | goto error_unlock; |
ab0ee2ca JG |
3699 | } |
3700 | ||
ab0ee2ca JG |
3701 | /* Enqueue buffer to outgoing queue and flush it. */ |
3702 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3703 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3704 | buffer, sizeof(buffer)); |
3705 | if (ret) { | |
6c24d3fd | 3706 | goto error_unlock; |
ab0ee2ca JG |
3707 | } |
3708 | ||
f2b3ef9f | 3709 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3710 | |
3711 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3712 | /* Queue could not be emptied. */ |
3713 | client->communication.outbound.queued_command_reply = true; | |
3714 | } | |
3715 | ||
3716 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3717 | ret = client_handle_transmission_status( |
3718 | client, transmission_status, state); | |
ab0ee2ca JG |
3719 | if (ret) { |
3720 | goto error; | |
3721 | } | |
3722 | ||
ab0ee2ca | 3723 | return 0; |
6c24d3fd JG |
3724 | error_unlock: |
3725 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3726 | error: |
3727 | return -1; | |
3728 | } | |
3729 | ||
505b2d90 JG |
3730 | static |
3731 | int client_handle_message_unknown(struct notification_client *client, | |
3732 | struct notification_thread_state *state) | |
3733 | { | |
3734 | int ret; | |
505b2d90 JG |
3735 | /* |
3736 | * Receiving message header. The function will be called again | |
3737 | * once the rest of the message as been received and can be | |
3738 | * interpreted. | |
3739 | */ | |
3740 | const struct lttng_notification_channel_message *msg; | |
3741 | ||
a0377dfe | 3742 | LTTNG_ASSERT(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3743 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3744 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3745 | |
3746 | if (msg->size == 0 || | |
3747 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
bd0514a5 | 3748 | ERR("Invalid notification channel message: length = %u", |
505b2d90 JG |
3749 | msg->size); |
3750 | ret = -1; | |
3751 | goto end; | |
3752 | } | |
3753 | ||
3754 | switch (msg->type) { | |
3755 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3756 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3757 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3758 | break; | |
3759 | default: | |
3760 | ret = -1; | |
bd0514a5 | 3761 | ERR("Invalid notification channel message: unexpected message type"); |
505b2d90 JG |
3762 | goto end; |
3763 | } | |
3764 | ||
3765 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3766 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3767 | client->communication.inbound.msg_type = |
3768 | (enum lttng_notification_channel_message_type) msg->type; | |
3769 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3770 | &client->communication.inbound.payload.buffer, msg->size); |
3771 | ||
3772 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3773 | msg = NULL; | |
505b2d90 | 3774 | end: |
505b2d90 JG |
3775 | return ret; |
3776 | } | |
3777 | ||
3778 | static | |
3779 | int client_handle_message_handshake(struct notification_client *client, | |
3780 | struct notification_thread_state *state) | |
3781 | { | |
3782 | int ret; | |
3783 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3784 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3785 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3786 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3787 | }; | |
3788 | const struct lttng_notification_channel_message msg_header = { | |
3789 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3790 | .size = sizeof(handshake_reply), | |
3791 | }; | |
3792 | enum lttng_notification_channel_status status = | |
3793 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3794 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3795 | |
3796 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3797 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3798 | sizeof(handshake_reply)); | |
3799 | ||
3800 | handshake_client = | |
3801 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3802 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3803 | .data; |
3804 | client->major = handshake_client->major; | |
3805 | client->minor = handshake_client->minor; | |
3806 | if (!client->communication.inbound.creds_received) { | |
bd0514a5 | 3807 | ERR("No credentials received from client"); |
505b2d90 JG |
3808 | ret = -1; |
3809 | goto end; | |
3810 | } | |
3811 | ||
3812 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3813 | &client->communication.inbound.creds); | |
3814 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3815 | &client->communication.inbound.creds); | |
f2bda80e JG |
3816 | client->is_sessiond = LTTNG_SOCK_GET_PID_CRED(&client->communication.inbound.creds) == getpid(); |
3817 | DBG("Received handshake from client: uid = %u, gid = %u, protocol version = %i.%i, client is sessiond = %s", | |
505b2d90 | 3818 | client->uid, client->gid, (int) client->major, |
f2bda80e JG |
3819 | (int) client->minor, |
3820 | client->is_sessiond ? "true" : "false"); | |
505b2d90 JG |
3821 | |
3822 | if (handshake_client->major != | |
3823 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3824 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3825 | } | |
3826 | ||
6c24d3fd JG |
3827 | pthread_mutex_lock(&client->lock); |
3828 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3829 | ret = lttng_dynamic_buffer_append( |
882093ee | 3830 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3831 | sizeof(send_buffer)); |
3832 | if (ret) { | |
bd0514a5 | 3833 | ERR("Failed to send protocol version to notification channel client"); |
6c24d3fd | 3834 | goto end_unlock; |
505b2d90 JG |
3835 | } |
3836 | ||
3837 | client->validated = true; | |
3838 | client->communication.active = true; | |
6c24d3fd | 3839 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3840 | |
6c24d3fd JG |
3841 | /* Set reception state to receive the next message header. */ |
3842 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3843 | if (ret) { |
bd0514a5 | 3844 | ERR("Failed to reset client communication's inbound state"); |
505b2d90 JG |
3845 | goto end; |
3846 | } | |
3847 | ||
6c24d3fd | 3848 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3849 | ret = client_send_command_reply(client, state, status); |
3850 | if (ret) { | |
bd0514a5 | 3851 | ERR("Failed to send reply to notification channel client"); |
505b2d90 JG |
3852 | goto end; |
3853 | } | |
3854 | ||
6c24d3fd JG |
3855 | goto end; |
3856 | end_unlock: | |
505b2d90 | 3857 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3858 | end: |
505b2d90 JG |
3859 | return ret; |
3860 | } | |
3861 | ||
3862 | static | |
3863 | int client_handle_message_subscription( | |
3864 | struct notification_client *client, | |
3865 | enum lttng_notification_channel_message_type msg_type, | |
3866 | struct notification_thread_state *state) | |
3867 | { | |
3868 | int ret; | |
3869 | struct lttng_condition *condition; | |
3870 | enum lttng_notification_channel_status status = | |
3871 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3872 | struct lttng_payload_view condition_view = | |
882093ee JR |
3873 | lttng_payload_view_from_payload( |
3874 | &client->communication.inbound.payload, | |
505b2d90 JG |
3875 | 0, -1); |
3876 | size_t expected_condition_size; | |
3877 | ||
6c24d3fd JG |
3878 | /* |
3879 | * No need to lock client to sample the inbound state as the only | |
3880 | * other thread accessing clients (action executor) only uses the | |
3881 | * outbound state. | |
3882 | */ | |
882093ee | 3883 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3884 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3885 | if (ret != expected_condition_size) { | |
bd0514a5 | 3886 | ERR("Malformed condition received from client"); |
505b2d90 JG |
3887 | goto end; |
3888 | } | |
3889 | ||
5a6306f7 | 3890 | /* Ownership of condition is always transferred. */ |
505b2d90 JG |
3891 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { |
3892 | ret = notification_thread_client_subscribe( | |
3893 | client, condition, state, &status); | |
3894 | } else { | |
3895 | ret = notification_thread_client_unsubscribe( | |
3896 | client, condition, state, &status); | |
3897 | } | |
505b2d90 | 3898 | |
505b2d90 | 3899 | if (ret) { |
6c24d3fd | 3900 | goto end; |
505b2d90 JG |
3901 | } |
3902 | ||
3903 | /* Set reception state to receive the next message header. */ | |
3904 | ret = client_reset_inbound_state(client); | |
3905 | if (ret) { | |
bd0514a5 | 3906 | ERR("Failed to reset client communication's inbound state"); |
6c24d3fd JG |
3907 | goto end; |
3908 | } | |
3909 | ||
3910 | ret = client_send_command_reply(client, state, status); | |
3911 | if (ret) { | |
bd0514a5 | 3912 | ERR("Failed to send reply to notification channel client"); |
6c24d3fd | 3913 | goto end; |
505b2d90 JG |
3914 | } |
3915 | ||
505b2d90 JG |
3916 | end: |
3917 | return ret; | |
3918 | } | |
3919 | ||
ab0ee2ca JG |
3920 | static |
3921 | int client_dispatch_message(struct notification_client *client, | |
3922 | struct notification_thread_state *state) | |
3923 | { | |
3924 | int ret = 0; | |
3925 | ||
3926 | if (client->communication.inbound.msg_type != | |
3927 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3928 | client->communication.inbound.msg_type != | |
3929 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3930 | !client->validated) { | |
bd0514a5 | 3931 | WARN("client attempted a command before handshake"); |
ab0ee2ca JG |
3932 | ret = -1; |
3933 | goto end; | |
3934 | } | |
3935 | ||
3936 | switch (client->communication.inbound.msg_type) { | |
3937 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3938 | { | |
505b2d90 | 3939 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3940 | break; |
3941 | } | |
3942 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3943 | { | |
505b2d90 | 3944 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3945 | break; |
3946 | } | |
3947 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3948 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3949 | { | |
505b2d90 JG |
3950 | ret = client_handle_message_subscription(client, |
3951 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3952 | break; |
3953 | } | |
3954 | default: | |
3955 | abort(); | |
3956 | } | |
3957 | end: | |
3958 | return ret; | |
3959 | } | |
3960 | ||
3961 | /* Incoming data from client. */ | |
3962 | int handle_notification_thread_client_in( | |
3963 | struct notification_thread_state *state, int socket) | |
3964 | { | |
14fa22f8 | 3965 | int ret = 0; |
ab0ee2ca JG |
3966 | struct notification_client *client; |
3967 | ssize_t recv_ret; | |
3968 | size_t offset; | |
3969 | ||
98b5ff34 | 3970 | rcu_read_lock(); |
ab0ee2ca JG |
3971 | client = get_client_from_socket(socket, state); |
3972 | if (!client) { | |
3973 | /* Internal error, abort. */ | |
3974 | ret = -1; | |
3975 | goto end; | |
3976 | } | |
3977 | ||
982583bd JR |
3978 | if (client->communication.inbound.bytes_to_receive == 0 && |
3979 | client->communication.inbound.fds_to_receive != 0) { | |
3980 | /* Only FDs left to receive. */ | |
3981 | goto receive_fds; | |
3982 | } | |
3983 | ||
882093ee | 3984 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3985 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3986 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3987 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3988 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3989 | client->communication.inbound.bytes_to_receive, |
3990 | &client->communication.inbound.creds); | |
3991 | if (recv_ret > 0) { | |
01ea340e | 3992 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3993 | client->communication.inbound.creds_received = true; |
3994 | } | |
3995 | } else { | |
3996 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 3997 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3998 | client->communication.inbound.bytes_to_receive); |
3999 | } | |
505b2d90 JG |
4000 | if (recv_ret >= 0) { |
4001 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
4002 | } else { |
4003 | goto error_disconnect_client; | |
505b2d90 | 4004 | } |
6c24d3fd | 4005 | |
882093ee JR |
4006 | if (client->communication.inbound.bytes_to_receive != 0) { |
4007 | /* Message incomplete wait for more data. */ | |
4008 | ret = 0; | |
4009 | goto end; | |
ab0ee2ca JG |
4010 | } |
4011 | ||
982583bd | 4012 | receive_fds: |
a0377dfe | 4013 | LTTNG_ASSERT(client->communication.inbound.bytes_to_receive == 0); |
882093ee JR |
4014 | |
4015 | /* Receive fds. */ | |
4016 | if (client->communication.inbound.fds_to_receive != 0) { | |
4017 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
4018 | client->socket, | |
4019 | client->communication.inbound.fds_to_receive, | |
4020 | &client->communication.inbound.payload); | |
4021 | if (ret > 0) { | |
ab0ee2ca | 4022 | /* |
882093ee JR |
4023 | * Fds received. non blocking fds passing is all |
4024 | * or nothing. | |
ab0ee2ca | 4025 | */ |
882093ee JR |
4026 | ssize_t expected_size; |
4027 | ||
4028 | expected_size = sizeof(int) * | |
4029 | client->communication.inbound | |
4030 | .fds_to_receive; | |
a0377dfe | 4031 | LTTNG_ASSERT(ret == expected_size); |
882093ee JR |
4032 | client->communication.inbound.fds_to_receive = 0; |
4033 | } else if (ret == 0) { | |
4034 | /* Received nothing. */ | |
4035 | ret = 0; | |
4036 | goto end; | |
4037 | } else { | |
ab0ee2ca JG |
4038 | goto error_disconnect_client; |
4039 | } | |
ab0ee2ca | 4040 | } |
882093ee JR |
4041 | |
4042 | /* At this point the message is complete.*/ | |
a0377dfe | 4043 | LTTNG_ASSERT(client->communication.inbound.bytes_to_receive == 0 && |
882093ee JR |
4044 | client->communication.inbound.fds_to_receive == 0); |
4045 | ret = client_dispatch_message(client, state); | |
4046 | if (ret) { | |
4047 | /* | |
4048 | * Only returns an error if this client must be | |
4049 | * disconnected. | |
4050 | */ | |
4051 | goto error_disconnect_client; | |
4052 | } | |
4053 | ||
ab0ee2ca | 4054 | end: |
98b5ff34 | 4055 | rcu_read_unlock(); |
ab0ee2ca | 4056 | return ret; |
882093ee | 4057 | |
ab0ee2ca | 4058 | error_disconnect_client: |
505b2d90 | 4059 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 4060 | goto end; |
ab0ee2ca JG |
4061 | } |
4062 | ||
4063 | /* Client ready to receive outgoing data. */ | |
4064 | int handle_notification_thread_client_out( | |
4065 | struct notification_thread_state *state, int socket) | |
4066 | { | |
4067 | int ret; | |
4068 | struct notification_client *client; | |
f2b3ef9f | 4069 | enum client_transmission_status transmission_status; |
ab0ee2ca | 4070 | |
98b5ff34 | 4071 | rcu_read_lock(); |
ab0ee2ca JG |
4072 | client = get_client_from_socket(socket, state); |
4073 | if (!client) { | |
4074 | /* Internal error, abort. */ | |
4075 | ret = -1; | |
4076 | goto end; | |
4077 | } | |
4078 | ||
505b2d90 | 4079 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 4080 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
4081 | pthread_mutex_unlock(&client->lock); |
4082 | ||
f2b3ef9f JG |
4083 | ret = client_handle_transmission_status( |
4084 | client, transmission_status, state); | |
ab0ee2ca JG |
4085 | if (ret) { |
4086 | goto end; | |
4087 | } | |
4088 | end: | |
98b5ff34 | 4089 | rcu_read_unlock(); |
ab0ee2ca JG |
4090 | return ret; |
4091 | } | |
4092 | ||
4093 | static | |
e8360425 JD |
4094 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
4095 | const struct channel_state_sample *sample, | |
4096 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
4097 | { |
4098 | bool result = false; | |
4099 | uint64_t threshold; | |
4100 | enum lttng_condition_type condition_type; | |
e8360425 | 4101 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
4102 | condition, struct lttng_condition_buffer_usage, |
4103 | parent); | |
4104 | ||
ab0ee2ca JG |
4105 | if (use_condition->threshold_bytes.set) { |
4106 | threshold = use_condition->threshold_bytes.value; | |
4107 | } else { | |
4108 | /* | |
4109 | * Threshold was expressed as a ratio. | |
4110 | * | |
4111 | * TODO the threshold (in bytes) of conditions expressed | |
4112 | * as a ratio of total buffer size could be cached to | |
4113 | * forego this double-multiplication or it could be performed | |
4114 | * as fixed-point math. | |
4115 | * | |
d49487dc | 4116 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
4117 | * condition applies to multiple channels (i.e. don't assume |
4118 | * that all channels matching my_chann* have the same size...) | |
4119 | */ | |
4120 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
4121 | (double) buffer_capacity); | |
4122 | } | |
4123 | ||
4124 | condition_type = lttng_condition_get_type(condition); | |
4125 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
bd0514a5 | 4126 | DBG("Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4127 | threshold, sample->highest_usage); |
4128 | ||
4129 | /* | |
4130 | * The low condition should only be triggered once _all_ of the | |
4131 | * streams in a channel have gone below the "low" threshold. | |
4132 | */ | |
4133 | if (sample->highest_usage <= threshold) { | |
4134 | result = true; | |
4135 | } | |
4136 | } else { | |
bd0514a5 | 4137 | DBG("High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4138 | threshold, sample->highest_usage); |
4139 | ||
4140 | /* | |
4141 | * For high buffer usage scenarios, we want to trigger whenever | |
4142 | * _any_ of the streams has reached the "high" threshold. | |
4143 | */ | |
4144 | if (sample->highest_usage >= threshold) { | |
4145 | result = true; | |
4146 | } | |
4147 | } | |
e8360425 | 4148 | |
ab0ee2ca JG |
4149 | return result; |
4150 | } | |
4151 | ||
4152 | static | |
e8360425 JD |
4153 | bool evaluate_session_consumed_size_condition( |
4154 | const struct lttng_condition *condition, | |
4155 | uint64_t session_consumed_size) | |
4156 | { | |
4157 | uint64_t threshold; | |
4158 | const struct lttng_condition_session_consumed_size *size_condition = | |
4159 | container_of(condition, | |
4160 | struct lttng_condition_session_consumed_size, | |
4161 | parent); | |
4162 | ||
4163 | threshold = size_condition->consumed_threshold_bytes.value; | |
bd0514a5 | 4164 | DBG("Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, |
e8360425 JD |
4165 | threshold, session_consumed_size); |
4166 | return session_consumed_size >= threshold; | |
4167 | } | |
4168 | ||
4169 | static | |
ed327204 | 4170 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 4171 | struct lttng_evaluation **evaluation, |
e8360425 JD |
4172 | const struct notification_thread_state *state, |
4173 | const struct channel_state_sample *previous_sample, | |
4174 | const struct channel_state_sample *latest_sample, | |
4175 | uint64_t previous_session_consumed_total, | |
4176 | uint64_t latest_session_consumed_total, | |
4177 | struct channel_info *channel_info) | |
ab0ee2ca JG |
4178 | { |
4179 | int ret = 0; | |
4180 | enum lttng_condition_type condition_type; | |
e8360425 JD |
4181 | const bool previous_sample_available = !!previous_sample; |
4182 | bool previous_sample_result = false; | |
ab0ee2ca JG |
4183 | bool latest_sample_result; |
4184 | ||
4185 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 4186 | |
e8360425 JD |
4187 | switch (condition_type) { |
4188 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4189 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
4190 | if (caa_likely(previous_sample_available)) { | |
4191 | previous_sample_result = | |
4192 | evaluate_buffer_usage_condition(condition, | |
4193 | previous_sample, channel_info->capacity); | |
4194 | } | |
4195 | latest_sample_result = evaluate_buffer_usage_condition( | |
4196 | condition, latest_sample, | |
4197 | channel_info->capacity); | |
4198 | break; | |
4199 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4200 | if (caa_likely(previous_sample_available)) { | |
4201 | previous_sample_result = | |
4202 | evaluate_session_consumed_size_condition( | |
4203 | condition, | |
4204 | previous_session_consumed_total); | |
4205 | } | |
4206 | latest_sample_result = | |
4207 | evaluate_session_consumed_size_condition( | |
4208 | condition, | |
4209 | latest_session_consumed_total); | |
4210 | break; | |
4211 | default: | |
4212 | /* Unknown condition type; internal error. */ | |
4213 | abort(); | |
4214 | } | |
ab0ee2ca JG |
4215 | |
4216 | if (!latest_sample_result || | |
4217 | (previous_sample_result == latest_sample_result)) { | |
4218 | /* | |
4219 | * Only trigger on a condition evaluation transition. | |
4220 | * | |
4221 | * NOTE: This edge-triggered logic may not be appropriate for | |
4222 | * future condition types. | |
4223 | */ | |
4224 | goto end; | |
4225 | } | |
4226 | ||
e8360425 JD |
4227 | if (!evaluation || !latest_sample_result) { |
4228 | goto end; | |
4229 | } | |
4230 | ||
4231 | switch (condition_type) { | |
4232 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4233 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
4234 | *evaluation = lttng_evaluation_buffer_usage_create( |
4235 | condition_type, | |
4236 | latest_sample->highest_usage, | |
e8360425 JD |
4237 | channel_info->capacity); |
4238 | break; | |
4239 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4240 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
4241 | latest_session_consumed_total); |
4242 | break; | |
4243 | default: | |
4244 | abort(); | |
4245 | } | |
4246 | ||
4247 | if (!*evaluation) { | |
4248 | ret = -1; | |
4249 | goto end; | |
ab0ee2ca JG |
4250 | } |
4251 | end: | |
4252 | return ret; | |
4253 | } | |
4254 | ||
4255 | static | |
f2b3ef9f | 4256 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4257 | { |
f2b3ef9f JG |
4258 | int ret = 0; |
4259 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 4260 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
4261 | }; |
4262 | ||
505b2d90 JG |
4263 | ASSERT_LOCKED(client->lock); |
4264 | ||
f2b3ef9f JG |
4265 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4266 | client->socket); | |
4267 | if (client->communication.outbound.dropped_notification) { | |
4268 | /* | |
4269 | * The client already has a "notification dropped" message | |
4270 | * in its outgoing queue. Nothing to do since all | |
4271 | * of those messages are coalesced. | |
4272 | */ | |
4273 | goto end; | |
4274 | } | |
4275 | ||
4276 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4277 | ret = lttng_dynamic_buffer_append( |
882093ee | 4278 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4279 | sizeof(msg)); |
f2b3ef9f JG |
4280 | if (ret) { |
4281 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4282 | client->socket); | |
4283 | } | |
4284 | end: | |
ab0ee2ca JG |
4285 | return ret; |
4286 | } | |
4287 | ||
f2b3ef9f JG |
4288 | static int client_handle_transmission_status_wrapper( |
4289 | struct notification_client *client, | |
4290 | enum client_transmission_status status, | |
4291 | void *user_data) | |
4292 | { | |
4293 | return client_handle_transmission_status(client, status, | |
4294 | (struct notification_thread_state *) user_data); | |
4295 | } | |
4296 | ||
4297 | static | |
4298 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4299 | const struct lttng_evaluation *evaluation, | |
4300 | struct notification_client_list* client_list, | |
4301 | struct notification_thread_state *state, | |
4302 | uid_t object_uid, gid_t object_gid) | |
4303 | { | |
ff588497 JR |
4304 | const struct lttng_credentials creds = { |
4305 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4306 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4307 | }; | |
4308 | ||
f2b3ef9f | 4309 | return notification_client_list_send_evaluation(client_list, |
52d55cf9 | 4310 | trigger, evaluation, |
ff588497 | 4311 | &creds, |
f2b3ef9f JG |
4312 | client_handle_transmission_status_wrapper, state); |
4313 | } | |
4314 | ||
f37d0f86 JG |
4315 | /* |
4316 | * Permission checks relative to notification channel clients are performed | |
4317 | * here. Notice how object, client, and trigger credentials are involved in | |
4318 | * this check. | |
4319 | * | |
4320 | * The `object` credentials are the credentials associated with the "subject" | |
4321 | * of a condition. For instance, a `rotation completed` condition applies | |
4322 | * to a session. When that condition is met, it will produce an evaluation | |
4323 | * against a session. Hence, in this case, the `object` credentials are the | |
4324 | * credentials of the "subject" session. | |
4325 | * | |
4326 | * The `trigger` credentials are the credentials of the user that registered the | |
4327 | * trigger. | |
4328 | * | |
4329 | * The `client` credentials are the credentials of the user that created a given | |
4330 | * notification channel. | |
4331 | * | |
4332 | * In terms of visibility, it is expected that non-privilieged users can only | |
4333 | * register triggers against "their" objects (their own sessions and | |
4334 | * applications they are allowed to interact with). They can then open a | |
4335 | * notification channel and subscribe to notifications associated with those | |
4336 | * triggers. | |
4337 | * | |
4338 | * As for privilieged users, they can register triggers against the objects of | |
4339 | * other users. They can then subscribe to the notifications associated to their | |
4340 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4341 | * triggers owned by other users; they must create their own triggers. | |
4342 | * | |
4343 | * This is more a concern of usability than security. It would be difficult for | |
4344 | * a root user reliably subscribe to a specific set of conditions without | |
4345 | * interference from external users (those could, for instance, unregister | |
4346 | * their triggers). | |
4347 | */ | |
f2b3ef9f JG |
4348 | LTTNG_HIDDEN |
4349 | int notification_client_list_send_evaluation( | |
4350 | struct notification_client_list *client_list, | |
52d55cf9 | 4351 | const struct lttng_trigger *trigger, |
9b63a4aa | 4352 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4353 | const struct lttng_credentials *source_object_creds, |
4354 | report_client_transmission_result_cb client_report, | |
4355 | void *user_data) | |
ab0ee2ca JG |
4356 | { |
4357 | int ret = 0; | |
c0a66c84 | 4358 | struct lttng_payload msg_payload; |
ab0ee2ca | 4359 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4360 | const struct lttng_notification notification = { |
52d55cf9 | 4361 | .trigger = (struct lttng_trigger *) trigger, |
9b63a4aa JG |
4362 | .evaluation = (struct lttng_evaluation *) evaluation, |
4363 | }; | |
3647288f JG |
4364 | struct lttng_notification_channel_message msg_header = { |
4365 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
4366 | }; | |
52d55cf9 JG |
4367 | const struct lttng_credentials *trigger_creds = |
4368 | lttng_trigger_get_credentials(trigger); | |
ab0ee2ca | 4369 | |
c0a66c84 | 4370 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4371 | |
c0a66c84 | 4372 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4373 | sizeof(msg_header)); |
ab0ee2ca JG |
4374 | if (ret) { |
4375 | goto end; | |
4376 | } | |
4377 | ||
c0a66c84 | 4378 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4379 | if (ret) { |
bd0514a5 | 4380 | ERR("Failed to serialize notification"); |
ab0ee2ca JG |
4381 | ret = -1; |
4382 | goto end; | |
4383 | } | |
4384 | ||
3647288f | 4385 | /* Update payload size. */ |
505b2d90 JG |
4386 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4387 | ->size = (uint32_t)( | |
4388 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4389 | |
882093ee JR |
4390 | /* Update the payload number of fds. */ |
4391 | { | |
4392 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4393 | &msg_payload, 0, -1); | |
4394 | ||
4395 | ((struct lttng_notification_channel_message *) | |
4396 | msg_payload.buffer.data)->fds = (uint32_t) | |
4397 | lttng_payload_view_get_fd_handle_count(&pv); | |
4398 | } | |
4399 | ||
505b2d90 | 4400 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 4401 | cds_list_for_each_entry_safe(client_list_element, tmp, |
091fa780 | 4402 | &client_list->clients_list, node) { |
f2b3ef9f | 4403 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4404 | struct notification_client *client = |
4405 | client_list_element->client; | |
4406 | ||
505b2d90 JG |
4407 | ret = 0; |
4408 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4409 | if (!client->communication.active) { |
4410 | /* | |
4411 | * Skip inactive client (protocol error or | |
4412 | * disconnecting). | |
4413 | */ | |
4414 | DBG("Skipping client at it is marked as inactive"); | |
4415 | goto skip_client; | |
4416 | } | |
4417 | ||
f2bda80e JG |
4418 | if (lttng_trigger_is_hidden(trigger) && !client->is_sessiond) { |
4419 | /* | |
4420 | * Notifications resulting from an hidden trigger are | |
4421 | * only sent to the session daemon. | |
4422 | */ | |
70eb2f6f JG |
4423 | DBG("Skipping client as the trigger is hidden and the client is not the session daemon"); |
4424 | goto skip_client; | |
f2bda80e JG |
4425 | } |
4426 | ||
f2b3ef9f | 4427 | if (source_object_creds) { |
ff588497 JR |
4428 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4429 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4430 | client->uid != 0) { |
4431 | /* | |
4432 | * Client is not allowed to monitor this | |
4433 | * object. | |
4434 | */ | |
bd0514a5 | 4435 | DBG("Skipping client at it does not have the object permission to receive notification for this trigger"); |
6c24d3fd | 4436 | goto skip_client; |
f2b3ef9f | 4437 | } |
90843f49 JR |
4438 | } |
4439 | ||
f712e5f6 | 4440 | if (client->uid != lttng_credentials_get_uid(trigger_creds)) { |
bd0514a5 | 4441 | DBG("Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4442 | goto skip_client; |
ab0ee2ca JG |
4443 | } |
4444 | ||
bd0514a5 | 4445 | DBG("Sending notification to client (fd = %i, %zu bytes)", |
c0a66c84 | 4446 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4447 | |
4448 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4449 | /* |
4450 | * Outgoing data is already buffered for this client; | |
4451 | * drop the notification and enqueue a "dropped | |
4452 | * notification" message if this is the first dropped | |
4453 | * notification since the socket spilled-over to the | |
4454 | * queue. | |
4455 | */ | |
f2b3ef9f JG |
4456 | ret = client_notification_overflow(client); |
4457 | if (ret) { | |
6c24d3fd JG |
4458 | /* Fatal error. */ |
4459 | goto skip_client; | |
ab0ee2ca | 4460 | } |
ab0ee2ca JG |
4461 | } |
4462 | ||
882093ee | 4463 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4464 | if (ret) { |
6c24d3fd JG |
4465 | /* Fatal error. */ |
4466 | goto skip_client; | |
ab0ee2ca JG |
4467 | } |
4468 | ||
f2b3ef9f | 4469 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4470 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4471 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4472 | if (ret) { |
6c24d3fd JG |
4473 | /* Fatal error. */ |
4474 | goto end_unlock_list; | |
505b2d90 | 4475 | } |
6c24d3fd JG |
4476 | |
4477 | continue; | |
4478 | ||
4479 | skip_client: | |
505b2d90 JG |
4480 | pthread_mutex_unlock(&client->lock); |
4481 | if (ret) { | |
6c24d3fd | 4482 | /* Fatal error. */ |
505b2d90 | 4483 | goto end_unlock_list; |
ab0ee2ca JG |
4484 | } |
4485 | } | |
4486 | ret = 0; | |
505b2d90 JG |
4487 | |
4488 | end_unlock_list: | |
4489 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4490 | end: |
c0a66c84 | 4491 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4492 | return ret; |
4493 | } | |
4494 | ||
8b524060 FD |
4495 | static |
4496 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4497 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4498 | { |
4499 | int ret; | |
b9a8d78f FD |
4500 | uint64_t token; |
4501 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4502 | char *capture_buffer = NULL; |
4503 | size_t capture_buffer_size; | |
94078603 JR |
4504 | void *reception_buffer; |
4505 | size_t reception_size; | |
4506 | ||
fc4b93fa | 4507 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
b8e2fb80 | 4508 | struct lttng_kernel_abi_event_notifier_notification kernel_notification; |
94078603 | 4509 | |
b9a8d78f | 4510 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4511 | switch(domain) { |
4512 | case LTTNG_DOMAIN_UST: | |
4513 | reception_buffer = (void *) &ust_notification; | |
4514 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4515 | break; |
4516 | case LTTNG_DOMAIN_KERNEL: | |
4517 | reception_buffer = (void *) &kernel_notification; | |
4518 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4519 | break; |
4520 | default: | |
4521 | abort(); | |
4522 | } | |
4523 | ||
4524 | /* | |
4525 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4526 | * ensuring that read/write of tracer notifications are atomic. | |
4527 | */ | |
4528 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4529 | reception_size); | |
4530 | if (ret != reception_size) { | |
4531 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4532 | notification_pipe_read_fd, reception_size, ret); | |
4533 | ret = -1; | |
4534 | goto end; | |
4535 | } | |
4536 | ||
4537 | switch(domain) { | |
4538 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4539 | token = ust_notification.token; |
82b3cbf4 | 4540 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4541 | break; |
4542 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4543 | token = kernel_notification.token; |
bbd6675c | 4544 | capture_buffer_size = kernel_notification.capture_buf_size; |
94078603 JR |
4545 | break; |
4546 | default: | |
4547 | abort(); | |
4548 | } | |
4549 | ||
82b3cbf4 JR |
4550 | if (capture_buffer_size == 0) { |
4551 | capture_buffer = NULL; | |
4552 | goto skip_capture; | |
4553 | } | |
4554 | ||
4555 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
bd0514a5 | 4556 | ERR("Event notifier has a capture payload size which exceeds the maximum allowed size: capture_payload_size = %zu bytes, max allowed size = %d bytes", |
82b3cbf4 JR |
4557 | capture_buffer_size, MAX_CAPTURE_SIZE); |
4558 | goto end; | |
4559 | } | |
4560 | ||
4561 | capture_buffer = zmalloc(capture_buffer_size); | |
4562 | if (!capture_buffer) { | |
bd0514a5 | 4563 | ERR("Failed to allocate capture buffer"); |
82b3cbf4 JR |
4564 | goto end; |
4565 | } | |
4566 | ||
4567 | /* Fetch additional payload (capture). */ | |
4568 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4569 | if (ret != capture_buffer_size) { | |
bd0514a5 | 4570 | ERR("Failed to read from event source pipe (fd = %i)", |
82b3cbf4 JR |
4571 | notification_pipe_read_fd); |
4572 | goto end; | |
4573 | } | |
4574 | ||
4575 | skip_capture: | |
4576 | notification = lttng_event_notifier_notification_create(token, domain, | |
4577 | capture_buffer, capture_buffer_size); | |
4578 | if (notification == NULL) { | |
4579 | goto end; | |
4580 | } | |
4581 | ||
4582 | /* | |
4583 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4584 | */ | |
4585 | capture_buffer = NULL; | |
4586 | ||
b9a8d78f | 4587 | end: |
82b3cbf4 | 4588 | free(capture_buffer); |
b9a8d78f FD |
4589 | return notification; |
4590 | } | |
4591 | ||
8b524060 FD |
4592 | static |
4593 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4594 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4595 | { |
b9a8d78f FD |
4596 | struct cds_lfht_node *node; |
4597 | struct cds_lfht_iter iter; | |
4598 | struct notification_trigger_tokens_ht_element *element; | |
4599 | struct lttng_evaluation *evaluation = NULL; | |
b9a8d78f FD |
4600 | enum action_executor_status executor_status; |
4601 | struct notification_client_list *client_list = NULL; | |
8b524060 | 4602 | int ret; |
7c920b63 | 4603 | unsigned int capture_count = 0; |
b9a8d78f | 4604 | |
94078603 JR |
4605 | /* Find triggers associated with this token. */ |
4606 | rcu_read_lock(); | |
4607 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4608 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4609 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4610 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4611 | if (caa_unlikely(!node)) { |
94078603 | 4612 | /* |
f1446131 JR |
4613 | * This is not an error, slow consumption of the tracer |
4614 | * notifications can lead to situations where a trigger is | |
4615 | * removed but we still get tracer notifications matching a | |
4616 | * trigger that no longer exists. | |
94078603 JR |
4617 | */ |
4618 | ret = 0; | |
4619 | goto end_unlock; | |
4620 | } | |
4621 | ||
4622 | element = caa_container_of(node, | |
4623 | struct notification_trigger_tokens_ht_element, | |
4624 | node); | |
4625 | ||
8dbb86b8 | 4626 | if (lttng_condition_event_rule_matches_get_capture_descriptor_count( |
7c920b63 PP |
4627 | lttng_trigger_get_const_condition(element->trigger), |
4628 | &capture_count) != LTTNG_CONDITION_STATUS_OK) { | |
4629 | ERR("Failed to get capture count"); | |
4630 | ret = -1; | |
4631 | goto end; | |
4632 | } | |
4633 | ||
4634 | if (!notification->capture_buffer && capture_count != 0) { | |
4635 | ERR("Expected capture but capture buffer is null"); | |
4636 | ret = -1; | |
4637 | goto end; | |
4638 | } | |
4639 | ||
8dbb86b8 | 4640 | evaluation = lttng_evaluation_event_rule_matches_create( |
7c920b63 PP |
4641 | container_of(lttng_trigger_get_const_condition( |
4642 | element->trigger), | |
8dbb86b8 | 4643 | struct lttng_condition_event_rule_matches, |
7c920b63 | 4644 | parent), |
7c920b63 PP |
4645 | notification->capture_buffer, |
4646 | notification->capture_buf_size, false); | |
4647 | ||
f1446131 | 4648 | if (evaluation == NULL) { |
8c1d25ff | 4649 | ERR("Failed to create event rule matches evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4650 | ret = -1; |
4651 | goto end_unlock; | |
4652 | } | |
8c1d25ff | 4653 | |
f1446131 JR |
4654 | client_list = get_client_list_from_condition(state, |
4655 | lttng_trigger_get_const_condition(element->trigger)); | |
72365501 | 4656 | executor_status = action_executor_enqueue_trigger(state->executor, |
f1446131 JR |
4657 | element->trigger, evaluation, NULL, client_list); |
4658 | switch (executor_status) { | |
4659 | case ACTION_EXECUTOR_STATUS_OK: | |
4660 | ret = 0; | |
4661 | break; | |
4662 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4663 | { | |
4664 | struct notification_client_list_element *client_list_element, | |
4665 | *tmp; | |
4666 | ||
4667 | /* | |
4668 | * Not a fatal error; this is expected and simply means the | |
4669 | * executor has too much work queued already. | |
4670 | */ | |
4671 | ret = 0; | |
4672 | ||
4673 | /* No clients subscribed to notifications for this trigger. */ | |
4674 | if (!client_list) { | |
4675 | break; | |
4676 | } | |
4677 | ||
4678 | /* Warn clients that a notification (or more) was dropped. */ | |
4679 | pthread_mutex_lock(&client_list->lock); | |
4680 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 4681 | &client_list->clients_list, node) { |
f1446131 JR |
4682 | enum client_transmission_status transmission_status; |
4683 | struct notification_client *client = | |
4684 | client_list_element->client; | |
4685 | ||
4686 | pthread_mutex_lock(&client->lock); | |
4687 | ret = client_notification_overflow(client); | |
4688 | if (ret) { | |
4689 | /* Fatal error. */ | |
4690 | goto next_client; | |
4691 | } | |
4692 | ||
4693 | transmission_status = | |
4694 | client_flush_outgoing_queue(client); | |
4695 | ret = client_handle_transmission_status( | |
4696 | client, transmission_status, state); | |
4697 | if (ret) { | |
4698 | /* Fatal error. */ | |
4699 | goto next_client; | |
4700 | } | |
4701 | next_client: | |
4702 | pthread_mutex_unlock(&client->lock); | |
4703 | if (ret) { | |
4704 | break; | |
4705 | } | |
4706 | } | |
4707 | ||
4708 | pthread_mutex_unlock(&client_list->lock); | |
4709 | break; | |
4710 | } | |
98dfca79 | 4711 | case ACTION_EXECUTOR_STATUS_INVALID: |
f1446131 JR |
4712 | case ACTION_EXECUTOR_STATUS_ERROR: |
4713 | /* Fatal error, shut down everything. */ | |
4714 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4715 | ret = -1; | |
4716 | goto end_unlock; | |
4717 | default: | |
4718 | /* Unhandled error. */ | |
4719 | abort(); | |
4720 | } | |
94078603 JR |
4721 | |
4722 | end_unlock: | |
f1446131 | 4723 | notification_client_list_put(client_list); |
94078603 | 4724 | rcu_read_unlock(); |
7c920b63 | 4725 | end: |
8b524060 FD |
4726 | return ret; |
4727 | } | |
4728 | ||
4729 | static | |
4730 | int handle_one_event_notifier_notification( | |
4731 | struct notification_thread_state *state, | |
4732 | int pipe, enum lttng_domain_type domain) | |
4733 | { | |
82b3cbf4 | 4734 | int ret = 0; |
8b524060 FD |
4735 | struct lttng_event_notifier_notification *notification = NULL; |
4736 | ||
4737 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4738 | if (notification == NULL) { | |
82b3cbf4 | 4739 | /* Reception failed, don't consider it fatal. */ |
bd0514a5 | 4740 | ERR("Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 | 4741 | pipe, lttng_domain_type_str(domain)); |
8b524060 FD |
4742 | goto end; |
4743 | } | |
4744 | ||
4745 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4746 | if (ret) { | |
bd0514a5 | 4747 | ERR("Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 FD |
4748 | pipe, lttng_domain_type_str(domain)); |
4749 | goto end; | |
4750 | } | |
4751 | ||
94078603 | 4752 | end: |
8b524060 | 4753 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4754 | return ret; |
4755 | } | |
4756 | ||
8b524060 FD |
4757 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4758 | int pipe, enum lttng_domain_type domain) | |
4759 | { | |
4760 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4761 | } | |
4762 | ||
ab0ee2ca JG |
4763 | int handle_notification_thread_channel_sample( |
4764 | struct notification_thread_state *state, int pipe, | |
4765 | enum lttng_domain_type domain) | |
4766 | { | |
4767 | int ret = 0; | |
4768 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4769 | struct channel_info *channel_info; |
4770 | struct cds_lfht_node *node; | |
4771 | struct cds_lfht_iter iter; | |
4772 | struct lttng_channel_trigger_list *trigger_list; | |
4773 | struct lttng_trigger_list_element *trigger_list_element; | |
4774 | bool previous_sample_available = false; | |
e8360425 JD |
4775 | struct channel_state_sample previous_sample, latest_sample; |
4776 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4777 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4778 | |
4779 | /* | |
4780 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4781 | * ensuring that read/write of sampling messages are atomic. | |
4782 | */ | |
7c2551ef | 4783 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca | 4784 | if (ret != sizeof(sample_msg)) { |
bd0514a5 | 4785 | ERR("Failed to read from monitoring pipe (fd = %i)", |
ab0ee2ca JG |
4786 | pipe); |
4787 | ret = -1; | |
4788 | goto end; | |
4789 | } | |
4790 | ||
4791 | ret = 0; | |
4792 | latest_sample.key.key = sample_msg.key; | |
4793 | latest_sample.key.domain = domain; | |
4794 | latest_sample.highest_usage = sample_msg.highest; | |
4795 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4796 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4797 | |
4798 | rcu_read_lock(); | |
4799 | ||
4800 | /* Retrieve the channel's informations */ | |
4801 | cds_lfht_lookup(state->channels_ht, | |
4802 | hash_channel_key(&latest_sample.key), | |
4803 | match_channel_info, | |
4804 | &latest_sample.key, | |
4805 | &iter); | |
4806 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4807 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4808 | /* |
4809 | * Not an error since the consumer can push a sample to the pipe | |
4810 | * and the rest of the session daemon could notify us of the | |
4811 | * channel's destruction before we get a chance to process that | |
4812 | * sample. | |
4813 | */ | |
bd0514a5 | 4814 | DBG("Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", |
ab0ee2ca | 4815 | latest_sample.key.key, |
526200e4 | 4816 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4817 | goto end_unlock; |
4818 | } | |
4819 | channel_info = caa_container_of(node, struct channel_info, | |
4820 | channels_ht_node); | |
bd0514a5 | 4821 | DBG("Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4822 | channel_info->name, |
ab0ee2ca | 4823 | latest_sample.key.key, |
8abe313a | 4824 | channel_info->session_info->name, |
ab0ee2ca | 4825 | latest_sample.highest_usage, |
e8360425 JD |
4826 | latest_sample.lowest_usage, |
4827 | latest_sample.channel_total_consumed); | |
4828 | ||
4829 | previous_session_consumed_total = | |
4830 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4831 | |
4832 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4833 | cds_lfht_lookup(state->channel_state_ht, | |
4834 | hash_channel_key(&latest_sample.key), | |
4835 | match_channel_state_sample, | |
4836 | &latest_sample.key, | |
4837 | &iter); | |
4838 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4839 | if (caa_likely(node)) { |
ab0ee2ca JG |
4840 | struct channel_state_sample *stored_sample; |
4841 | ||
4842 | /* Update the sample stored. */ | |
4843 | stored_sample = caa_container_of(node, | |
4844 | struct channel_state_sample, | |
4845 | channel_state_ht_node); | |
e8360425 | 4846 | |
ab0ee2ca JG |
4847 | memcpy(&previous_sample, stored_sample, |
4848 | sizeof(previous_sample)); | |
4849 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4850 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4851 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4852 | previous_sample_available = true; |
e8360425 JD |
4853 | |
4854 | latest_session_consumed_total = | |
4855 | previous_session_consumed_total + | |
4856 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4857 | } else { |
4858 | /* | |
4859 | * This is the channel's first sample, allocate space for and | |
4860 | * store the new sample. | |
4861 | */ | |
4862 | struct channel_state_sample *stored_sample; | |
4863 | ||
4864 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4865 | if (!stored_sample) { | |
4866 | ret = -1; | |
4867 | goto end_unlock; | |
4868 | } | |
4869 | ||
4870 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4871 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4872 | cds_lfht_add(state->channel_state_ht, | |
4873 | hash_channel_key(&stored_sample->key), | |
4874 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4875 | |
4876 | latest_session_consumed_total = | |
4877 | previous_session_consumed_total + | |
4878 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4879 | } |
4880 | ||
e8360425 JD |
4881 | channel_info->session_info->consumed_data_size = |
4882 | latest_session_consumed_total; | |
4883 | ||
ab0ee2ca JG |
4884 | /* Find triggers associated with this channel. */ |
4885 | cds_lfht_lookup(state->channel_triggers_ht, | |
4886 | hash_channel_key(&latest_sample.key), | |
4887 | match_channel_trigger_list, | |
4888 | &latest_sample.key, | |
4889 | &iter); | |
4890 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4891 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4892 | goto end_unlock; |
4893 | } | |
4894 | ||
f2b3ef9f | 4895 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4896 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4897 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4898 | }; |
4899 | ||
ab0ee2ca JG |
4900 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4901 | channel_triggers_ht_node); | |
4902 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4903 | node) { |
9b63a4aa | 4904 | const struct lttng_condition *condition; |
f2b3ef9f | 4905 | struct lttng_trigger *trigger; |
505b2d90 | 4906 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4907 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4908 | enum action_executor_status executor_status; |
ab0ee2ca | 4909 | |
505b2d90 | 4910 | ret = 0; |
ab0ee2ca | 4911 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4912 | condition = lttng_trigger_get_const_condition(trigger); |
a0377dfe | 4913 | LTTNG_ASSERT(condition); |
ab0ee2ca JG |
4914 | |
4915 | /* | |
4916 | * Check if any client is subscribed to the result of this | |
4917 | * evaluation. | |
4918 | */ | |
ed327204 | 4919 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4920 | |
ed327204 | 4921 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4922 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4923 | &latest_sample, |
4924 | previous_session_consumed_total, | |
4925 | latest_session_consumed_total, | |
4926 | channel_info); | |
4927 | if (caa_unlikely(ret)) { | |
505b2d90 | 4928 | goto put_list; |
ab0ee2ca JG |
4929 | } |
4930 | ||
e8360425 | 4931 | if (caa_likely(!evaluation)) { |
505b2d90 | 4932 | goto put_list; |
ab0ee2ca JG |
4933 | } |
4934 | ||
f2b3ef9f JG |
4935 | /* |
4936 | * Ownership of `evaluation` transferred to the action executor | |
4937 | * no matter the result. | |
4938 | */ | |
72365501 JR |
4939 | executor_status = action_executor_enqueue_trigger( |
4940 | state->executor, trigger, evaluation, | |
4941 | &channel_creds, client_list); | |
f2b3ef9f JG |
4942 | evaluation = NULL; |
4943 | switch (executor_status) { | |
4944 | case ACTION_EXECUTOR_STATUS_OK: | |
4945 | break; | |
4946 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4947 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4948 | /* | |
4949 | * TODO Add trigger identification (name/id) when | |
4950 | * it is added to the API. | |
4951 | */ | |
4952 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4953 | ret = -1; | |
4954 | goto put_list; | |
4955 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4956 | /* | |
4957 | * TODO Add trigger identification (name/id) when | |
4958 | * it is added to the API. | |
4959 | * | |
4960 | * Not a fatal error. | |
4961 | */ | |
4962 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4963 | ret = 0; | |
4964 | goto put_list; | |
4965 | default: | |
4966 | abort(); | |
4967 | } | |
4968 | ||
505b2d90 JG |
4969 | put_list: |
4970 | notification_client_list_put(client_list); | |
e0b5f87b | 4971 | if (caa_unlikely(ret)) { |
505b2d90 | 4972 | break; |
ab0ee2ca JG |
4973 | } |
4974 | } | |
4975 | end_unlock: | |
4976 | rcu_read_unlock(); | |
4977 | end: | |
4978 | return ret; | |
4979 | } |