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 | { | |
7966af57 | 298 | const uint64_t *_key = (uint64_t *) key; |
e7c93cf9 JR |
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 | { | |
7966af57 | 325 | const char *name = (const char *) key; |
f82f93a1 JG |
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 | { |
7966af57 | 525 | struct session_info *session_info = (struct 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 | |
7966af57 | 572 | session_info = (struct session_info *) zmalloc(sizeof(*session_info)); |
8abe313a JG |
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 | { | |
7966af57 | 626 | struct channel_info *channel_info = (struct channel_info *) zmalloc(sizeof(*channel_info)); |
8abe313a JG |
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 | ||
505b2d90 JG |
657 | bool notification_client_list_get(struct notification_client_list *list) |
658 | { | |
659 | return urcu_ref_get_unless_zero(&list->ref); | |
660 | } | |
661 | ||
662 | static | |
663 | void free_notification_client_list_rcu(struct rcu_head *node) | |
664 | { | |
665 | free(caa_container_of(node, struct notification_client_list, | |
666 | rcu_node)); | |
667 | } | |
668 | ||
669 | static | |
670 | void notification_client_list_release(struct urcu_ref *list_ref) | |
671 | { | |
672 | struct notification_client_list *list = | |
673 | container_of(list_ref, typeof(*list), ref); | |
674 | struct notification_client_list_element *client_list_element, *tmp; | |
675 | ||
091fa780 FD |
676 | lttng_condition_put(list->condition); |
677 | ||
505b2d90 JG |
678 | if (list->notification_trigger_clients_ht) { |
679 | rcu_read_lock(); | |
091fa780 | 680 | |
505b2d90 JG |
681 | cds_lfht_del(list->notification_trigger_clients_ht, |
682 | &list->notification_trigger_clients_ht_node); | |
683 | rcu_read_unlock(); | |
684 | list->notification_trigger_clients_ht = NULL; | |
685 | } | |
686 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 687 | &list->clients_list, node) { |
505b2d90 JG |
688 | free(client_list_element); |
689 | } | |
091fa780 | 690 | |
a0377dfe | 691 | LTTNG_ASSERT(cds_list_empty(&list->triggers_list)); |
091fa780 | 692 | |
505b2d90 JG |
693 | pthread_mutex_destroy(&list->lock); |
694 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
695 | } | |
696 | ||
091fa780 FD |
697 | static |
698 | bool condition_applies_to_client(const struct lttng_condition *condition, | |
699 | struct notification_client *client) | |
700 | { | |
701 | bool applies = false; | |
702 | struct lttng_condition_list_element *condition_list_element; | |
703 | ||
704 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
705 | node) { | |
706 | applies = lttng_condition_is_equal( | |
707 | condition_list_element->condition, | |
708 | condition); | |
709 | if (applies) { | |
710 | break; | |
711 | } | |
712 | } | |
713 | ||
714 | return applies; | |
715 | } | |
716 | ||
505b2d90 JG |
717 | static |
718 | struct notification_client_list *notification_client_list_create( | |
091fa780 FD |
719 | struct notification_thread_state *state, |
720 | const struct lttng_condition *condition) | |
505b2d90 | 721 | { |
091fa780 FD |
722 | struct notification_client *client; |
723 | struct cds_lfht_iter iter; | |
724 | struct notification_client_list *client_list; | |
505b2d90 | 725 | |
7966af57 | 726 | client_list = (notification_client_list *) zmalloc(sizeof(*client_list)); |
505b2d90 | 727 | if (!client_list) { |
091fa780 FD |
728 | PERROR("Failed to allocate notification client list"); |
729 | goto end; | |
505b2d90 | 730 | } |
091fa780 | 731 | |
505b2d90 | 732 | pthread_mutex_init(&client_list->lock, NULL); |
091fa780 FD |
733 | /* |
734 | * The trigger that owns the condition has the first reference to this | |
735 | * client list. | |
736 | */ | |
505b2d90 JG |
737 | urcu_ref_init(&client_list->ref); |
738 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
091fa780 FD |
739 | CDS_INIT_LIST_HEAD(&client_list->clients_list); |
740 | CDS_INIT_LIST_HEAD(&client_list->triggers_list); | |
505b2d90 | 741 | |
091fa780 FD |
742 | /* |
743 | * Create a copy of the condition so that it's independent of any | |
744 | * trigger. The client list may outlive the trigger object (which owns | |
745 | * the condition) that is used to create it. | |
746 | */ | |
747 | client_list->condition = lttng_condition_copy(condition); | |
748 | ||
749 | /* Build a list of clients to which this new condition applies. */ | |
750 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
751 | client_socket_ht_node) { | |
752 | struct notification_client_list_element *client_list_element; | |
505b2d90 | 753 | |
091fa780 FD |
754 | if (!condition_applies_to_client(condition, client)) { |
755 | continue; | |
756 | } | |
757 | ||
7966af57 | 758 | client_list_element = (notification_client_list_element *) zmalloc(sizeof(*client_list_element)); |
091fa780 FD |
759 | if (!client_list_element) { |
760 | goto error_put_client_list; | |
761 | } | |
505b2d90 | 762 | |
091fa780 FD |
763 | CDS_INIT_LIST_HEAD(&client_list_element->node); |
764 | client_list_element->client = client; | |
765 | cds_list_add(&client_list_element->node, &client_list->clients_list); | |
766 | } | |
767 | ||
768 | client_list->notification_trigger_clients_ht = | |
505b2d90 JG |
769 | state->notification_trigger_clients_ht; |
770 | ||
771 | rcu_read_lock(); | |
091fa780 FD |
772 | /* |
773 | * Add the client list to the global list of client list. | |
774 | */ | |
775 | cds_lfht_add_unique(state->notification_trigger_clients_ht, | |
776 | lttng_condition_hash(client_list->condition), | |
777 | match_client_list_condition, | |
778 | client_list->condition, | |
779 | &client_list->notification_trigger_clients_ht_node); | |
505b2d90 | 780 | rcu_read_unlock(); |
091fa780 FD |
781 | goto end; |
782 | ||
783 | error_put_client_list: | |
784 | notification_client_list_put(client_list); | |
785 | client_list = NULL; | |
786 | ||
787 | end: | |
788 | return client_list; | |
505b2d90 JG |
789 | } |
790 | ||
505b2d90 JG |
791 | void notification_client_list_put(struct notification_client_list *list) |
792 | { | |
793 | if (!list) { | |
794 | return; | |
795 | } | |
796 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
797 | } | |
798 | ||
799 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
800 | static |
801 | struct notification_client_list *get_client_list_from_condition( | |
802 | struct notification_thread_state *state, | |
803 | const struct lttng_condition *condition) | |
804 | { | |
805 | struct cds_lfht_node *node; | |
806 | struct cds_lfht_iter iter; | |
505b2d90 | 807 | struct notification_client_list *list = NULL; |
ed327204 | 808 | |
505b2d90 | 809 | rcu_read_lock(); |
ed327204 JG |
810 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
811 | lttng_condition_hash(condition), | |
812 | match_client_list_condition, | |
813 | condition, | |
814 | &iter); | |
815 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
816 | if (node) { |
817 | list = container_of(node, struct notification_client_list, | |
818 | notification_trigger_clients_ht_node); | |
819 | list = notification_client_list_get(list) ? list : NULL; | |
820 | } | |
ed327204 | 821 | |
505b2d90 JG |
822 | rcu_read_unlock(); |
823 | return list; | |
ed327204 JG |
824 | } |
825 | ||
e4db5ace | 826 | static |
f82f93a1 JG |
827 | int evaluate_channel_condition_for_client( |
828 | const struct lttng_condition *condition, | |
829 | struct notification_thread_state *state, | |
830 | struct lttng_evaluation **evaluation, | |
831 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
832 | { |
833 | int ret; | |
834 | struct cds_lfht_iter iter; | |
835 | struct cds_lfht_node *node; | |
836 | struct channel_info *channel_info = NULL; | |
837 | struct channel_key *channel_key = NULL; | |
838 | struct channel_state_sample *last_sample = NULL; | |
839 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 840 | |
505b2d90 JG |
841 | rcu_read_lock(); |
842 | ||
f82f93a1 | 843 | /* Find the channel associated with the condition. */ |
e4db5ace | 844 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 845 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
846 | struct lttng_trigger_list_element *element; |
847 | ||
848 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 849 | const struct lttng_condition *current_condition = |
f82f93a1 | 850 | lttng_trigger_get_const_condition( |
e4db5ace JR |
851 | element->trigger); |
852 | ||
a0377dfe | 853 | LTTNG_ASSERT(current_condition); |
e4db5ace | 854 | if (!lttng_condition_is_equal(condition, |
2ae99f0b | 855 | current_condition)) { |
e4db5ace JR |
856 | continue; |
857 | } | |
858 | ||
859 | /* Found the trigger, save the channel key. */ | |
860 | channel_key = &channel_trigger_list->channel_key; | |
861 | break; | |
862 | } | |
863 | if (channel_key) { | |
864 | /* The channel key was found stop iteration. */ | |
865 | break; | |
866 | } | |
867 | } | |
868 | ||
869 | if (!channel_key){ | |
870 | /* No channel found; normal exit. */ | |
bd0514a5 | 871 | DBG("No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
872 | ret = 0; |
873 | goto end; | |
874 | } | |
875 | ||
876 | /* Fetch channel info for the matching channel. */ | |
877 | cds_lfht_lookup(state->channels_ht, | |
878 | hash_channel_key(channel_key), | |
879 | match_channel_info, | |
880 | channel_key, | |
881 | &iter); | |
882 | node = cds_lfht_iter_get_node(&iter); | |
a0377dfe | 883 | LTTNG_ASSERT(node); |
e4db5ace JR |
884 | channel_info = caa_container_of(node, struct channel_info, |
885 | channels_ht_node); | |
886 | ||
887 | /* Retrieve the channel's last sample, if it exists. */ | |
888 | cds_lfht_lookup(state->channel_state_ht, | |
889 | hash_channel_key(channel_key), | |
890 | match_channel_state_sample, | |
891 | channel_key, | |
892 | &iter); | |
893 | node = cds_lfht_iter_get_node(&iter); | |
894 | if (node) { | |
895 | last_sample = caa_container_of(node, | |
896 | struct channel_state_sample, | |
897 | channel_state_ht_node); | |
898 | } else { | |
899 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
bd0514a5 | 900 | DBG("No channel sample associated with newly subscribed-to condition"); |
e4db5ace JR |
901 | ret = 0; |
902 | goto end; | |
903 | } | |
904 | ||
f82f93a1 | 905 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
906 | NULL, last_sample, |
907 | 0, channel_info->session_info->consumed_data_size, | |
908 | channel_info); | |
e4db5ace | 909 | if (ret) { |
bd0514a5 | 910 | WARN("Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
911 | goto end; |
912 | } | |
913 | ||
f82f93a1 JG |
914 | *session_uid = channel_info->session_info->uid; |
915 | *session_gid = channel_info->session_info->gid; | |
916 | end: | |
505b2d90 | 917 | rcu_read_unlock(); |
f82f93a1 JG |
918 | return ret; |
919 | } | |
920 | ||
921 | static | |
922 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
923 | { | |
924 | const char *session_name = NULL; | |
925 | enum lttng_condition_status status; | |
926 | ||
927 | switch (lttng_condition_get_type(condition)) { | |
928 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
929 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
930 | status = lttng_condition_buffer_usage_get_session_name( | |
931 | condition, &session_name); | |
932 | break; | |
933 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
934 | status = lttng_condition_session_consumed_size_get_session_name( | |
935 | condition, &session_name); | |
936 | break; | |
937 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
938 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
939 | status = lttng_condition_session_rotation_get_session_name( | |
940 | condition, &session_name); | |
941 | break; | |
942 | default: | |
943 | abort(); | |
944 | } | |
945 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 946 | ERR("Failed to retrieve session rotation condition's session name"); |
f82f93a1 JG |
947 | goto end; |
948 | } | |
949 | end: | |
950 | return session_name; | |
951 | } | |
952 | ||
f82f93a1 JG |
953 | static |
954 | int evaluate_session_condition_for_client( | |
955 | const struct lttng_condition *condition, | |
956 | struct notification_thread_state *state, | |
957 | struct lttng_evaluation **evaluation, | |
958 | uid_t *session_uid, gid_t *session_gid) | |
959 | { | |
960 | int ret; | |
961 | struct cds_lfht_iter iter; | |
962 | struct cds_lfht_node *node; | |
963 | const char *session_name; | |
964 | struct session_info *session_info = NULL; | |
965 | ||
505b2d90 | 966 | rcu_read_lock(); |
f82f93a1 JG |
967 | session_name = get_condition_session_name(condition); |
968 | ||
969 | /* Find the session associated with the trigger. */ | |
970 | cds_lfht_lookup(state->sessions_ht, | |
971 | hash_key_str(session_name, lttng_ht_seed), | |
972 | match_session, | |
973 | session_name, | |
974 | &iter); | |
975 | node = cds_lfht_iter_get_node(&iter); | |
976 | if (!node) { | |
bd0514a5 | 977 | DBG("No known session matching name \"%s\"", |
f82f93a1 JG |
978 | session_name); |
979 | ret = 0; | |
980 | goto end; | |
981 | } | |
982 | ||
983 | session_info = caa_container_of(node, struct session_info, | |
984 | sessions_ht_node); | |
985 | session_info_get(session_info); | |
986 | ||
987 | /* | |
988 | * Evaluation is performed in-line here since only one type of | |
989 | * session-bound condition is handled for the moment. | |
990 | */ | |
991 | switch (lttng_condition_get_type(condition)) { | |
992 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
993 | if (!session_info->rotation.ongoing) { | |
be558f88 | 994 | ret = 0; |
f82f93a1 JG |
995 | goto end_session_put; |
996 | } | |
997 | ||
998 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
999 | session_info->rotation.id); | |
1000 | if (!*evaluation) { | |
1001 | /* Fatal error. */ | |
bd0514a5 | 1002 | ERR("Failed to create session rotation ongoing evaluation for session \"%s\"", |
f82f93a1 JG |
1003 | session_info->name); |
1004 | ret = -1; | |
1005 | goto end_session_put; | |
1006 | } | |
1007 | ret = 0; | |
1008 | break; | |
1009 | default: | |
1010 | ret = 0; | |
1011 | goto end_session_put; | |
1012 | } | |
1013 | ||
1014 | *session_uid = session_info->uid; | |
1015 | *session_gid = session_info->gid; | |
1016 | ||
1017 | end_session_put: | |
1018 | session_info_put(session_info); | |
1019 | end: | |
505b2d90 | 1020 | rcu_read_unlock(); |
f82f93a1 JG |
1021 | return ret; |
1022 | } | |
1023 | ||
f82f93a1 JG |
1024 | static |
1025 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
1026 | const struct lttng_condition *condition, | |
1027 | struct notification_client *client, | |
1028 | struct notification_thread_state *state) | |
1029 | { | |
1030 | int ret; | |
1031 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
1032 | struct notification_client_list client_list = { |
1033 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
1034 | }; | |
f82f93a1 JG |
1035 | struct notification_client_list_element client_list_element = { 0 }; |
1036 | uid_t object_uid = 0; | |
1037 | gid_t object_gid = 0; | |
1038 | ||
a0377dfe FD |
1039 | LTTNG_ASSERT(trigger); |
1040 | LTTNG_ASSERT(condition); | |
1041 | LTTNG_ASSERT(client); | |
1042 | LTTNG_ASSERT(state); | |
f82f93a1 JG |
1043 | |
1044 | switch (get_condition_binding_object(condition)) { | |
1045 | case LTTNG_OBJECT_TYPE_SESSION: | |
1046 | ret = evaluate_session_condition_for_client(condition, state, | |
1047 | &evaluation, &object_uid, &object_gid); | |
1048 | break; | |
1049 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
1050 | ret = evaluate_channel_condition_for_client(condition, state, | |
1051 | &evaluation, &object_uid, &object_gid); | |
1052 | break; | |
1053 | case LTTNG_OBJECT_TYPE_NONE: | |
bd0514a5 | 1054 | DBG("Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
1055 | ret = 0; |
1056 | goto end; | |
1057 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
1058 | default: | |
1059 | ret = -1; | |
1060 | goto end; | |
1061 | } | |
af0c318d JG |
1062 | if (ret) { |
1063 | /* Fatal error. */ | |
1064 | goto end; | |
1065 | } | |
e4db5ace JR |
1066 | if (!evaluation) { |
1067 | /* Evaluation yielded nothing. Normal exit. */ | |
bd0514a5 | 1068 | DBG("Newly subscribed-to condition evaluated to false, nothing to report to client"); |
e4db5ace JR |
1069 | ret = 0; |
1070 | goto end; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Create a temporary client list with the client currently | |
1075 | * subscribing. | |
1076 | */ | |
505b2d90 | 1077 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
091fa780 | 1078 | CDS_INIT_LIST_HEAD(&client_list.clients_list); |
e4db5ace JR |
1079 | |
1080 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1081 | client_list_element.client = client; | |
091fa780 | 1082 | cds_list_add(&client_list_element.node, &client_list.clients_list); |
e4db5ace JR |
1083 | |
1084 | /* Send evaluation result to the newly-subscribed client. */ | |
bd0514a5 | 1085 | DBG("Newly subscribed-to condition evaluated to true, notifying client"); |
e4db5ace | 1086 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, |
f82f93a1 | 1087 | state, object_uid, object_gid); |
e4db5ace JR |
1088 | |
1089 | end: | |
1090 | return ret; | |
1091 | } | |
1092 | ||
ab0ee2ca JG |
1093 | static |
1094 | int notification_thread_client_subscribe(struct notification_client *client, | |
1095 | struct lttng_condition *condition, | |
1096 | struct notification_thread_state *state, | |
1097 | enum lttng_notification_channel_status *_status) | |
1098 | { | |
1099 | int ret = 0; | |
505b2d90 | 1100 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1101 | struct lttng_condition_list_element *condition_list_element = NULL; |
1102 | struct notification_client_list_element *client_list_element = NULL; | |
a3ed2a4e | 1103 | struct lttng_trigger_ht_element *trigger_ht_element; |
ab0ee2ca JG |
1104 | enum lttng_notification_channel_status status = |
1105 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1106 | ||
1107 | /* | |
1108 | * Ensure that the client has not already subscribed to this condition | |
1109 | * before. | |
1110 | */ | |
1111 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1112 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1113 | condition)) { | |
1114 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1115 | goto end; | |
1116 | } | |
1117 | } | |
1118 | ||
7966af57 | 1119 | condition_list_element = (lttng_condition_list_element *) zmalloc(sizeof(*condition_list_element)); |
ab0ee2ca JG |
1120 | if (!condition_list_element) { |
1121 | ret = -1; | |
1122 | goto error; | |
1123 | } | |
7966af57 | 1124 | client_list_element = (notification_client_list_element *) zmalloc(sizeof(*client_list_element)); |
ab0ee2ca JG |
1125 | if (!client_list_element) { |
1126 | ret = -1; | |
1127 | goto error; | |
1128 | } | |
1129 | ||
ab0ee2ca JG |
1130 | /* |
1131 | * Add the newly-subscribed condition to the client's subscription list. | |
1132 | */ | |
1133 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1134 | condition_list_element->condition = condition; | |
5a6306f7 | 1135 | condition = NULL; |
ab0ee2ca JG |
1136 | cds_list_add(&condition_list_element->node, &client->condition_list); |
1137 | ||
5a6306f7 JG |
1138 | client_list = get_client_list_from_condition( |
1139 | state, condition_list_element->condition); | |
ed327204 | 1140 | if (!client_list) { |
2ae99f0b JG |
1141 | /* |
1142 | * No notification-emiting trigger registered with this | |
1143 | * condition. We don't evaluate the condition right away | |
1144 | * since this trigger is not registered yet. | |
1145 | */ | |
4fb43b68 | 1146 | free(client_list_element); |
505b2d90 | 1147 | goto end; |
ab0ee2ca JG |
1148 | } |
1149 | ||
2ae99f0b JG |
1150 | /* |
1151 | * The condition to which the client just subscribed is evaluated | |
1152 | * at this point so that conditions that are already TRUE result | |
1153 | * in a notification being sent out. | |
505b2d90 | 1154 | * |
57644a7f JG |
1155 | * Note the iteration on all triggers which share an identical |
1156 | * `condition` than the one to which the client is registering. This is | |
1157 | * done to ensure that the client receives a distinct notification for | |
1158 | * all triggers that have a `notify` action that have this condition. | |
2ae99f0b | 1159 | */ |
091fa780 FD |
1160 | pthread_mutex_lock(&client_list->lock); |
1161 | cds_list_for_each_entry(trigger_ht_element, | |
1162 | &client_list->triggers_list, client_list_trigger_node) { | |
5a6306f7 | 1163 | if (evaluate_condition_for_client(trigger_ht_element->trigger, condition_list_element->condition, |
091fa780 | 1164 | client, state)) { |
bd0514a5 | 1165 | WARN("Evaluation of a condition on client subscription failed, aborting."); |
091fa780 FD |
1166 | ret = -1; |
1167 | free(client_list_element); | |
ecc7ed07 | 1168 | pthread_mutex_unlock(&client_list->lock); |
091fa780 FD |
1169 | goto end; |
1170 | } | |
e4db5ace | 1171 | } |
091fa780 | 1172 | pthread_mutex_unlock(&client_list->lock); |
e4db5ace JR |
1173 | |
1174 | /* | |
1175 | * Add the client to the list of clients interested in a given trigger | |
1176 | * if a "notification" trigger with a corresponding condition was | |
1177 | * added prior. | |
1178 | */ | |
ab0ee2ca JG |
1179 | client_list_element->client = client; |
1180 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1181 | |
1182 | pthread_mutex_lock(&client_list->lock); | |
091fa780 | 1183 | cds_list_add(&client_list_element->node, &client_list->clients_list); |
505b2d90 | 1184 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1185 | end: |
1186 | if (_status) { | |
1187 | *_status = status; | |
1188 | } | |
505b2d90 JG |
1189 | if (client_list) { |
1190 | notification_client_list_put(client_list); | |
1191 | } | |
5a6306f7 | 1192 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1193 | return ret; |
1194 | error: | |
1195 | free(condition_list_element); | |
1196 | free(client_list_element); | |
5a6306f7 | 1197 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1198 | return ret; |
1199 | } | |
1200 | ||
1201 | static | |
1202 | int notification_thread_client_unsubscribe( | |
1203 | struct notification_client *client, | |
1204 | struct lttng_condition *condition, | |
1205 | struct notification_thread_state *state, | |
1206 | enum lttng_notification_channel_status *_status) | |
1207 | { | |
ab0ee2ca JG |
1208 | struct notification_client_list *client_list; |
1209 | struct lttng_condition_list_element *condition_list_element, | |
1210 | *condition_tmp; | |
1211 | struct notification_client_list_element *client_list_element, | |
1212 | *client_tmp; | |
1213 | bool condition_found = false; | |
1214 | enum lttng_notification_channel_status status = | |
1215 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1216 | ||
1217 | /* Remove the condition from the client's condition list. */ | |
1218 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1219 | &client->condition_list, node) { | |
1220 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1221 | condition)) { | |
1222 | continue; | |
1223 | } | |
1224 | ||
1225 | cds_list_del(&condition_list_element->node); | |
1226 | /* | |
1227 | * The caller may be iterating on the client's conditions to | |
1228 | * tear down a client's connection. In this case, the condition | |
1229 | * will be destroyed at the end. | |
1230 | */ | |
1231 | if (condition != condition_list_element->condition) { | |
1232 | lttng_condition_destroy( | |
1233 | condition_list_element->condition); | |
1234 | } | |
1235 | free(condition_list_element); | |
1236 | condition_found = true; | |
1237 | break; | |
1238 | } | |
1239 | ||
1240 | if (!condition_found) { | |
1241 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1242 | goto end; | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Remove the client from the list of clients interested the trigger | |
1247 | * matching the condition. | |
1248 | */ | |
ed327204 JG |
1249 | client_list = get_client_list_from_condition(state, condition); |
1250 | if (!client_list) { | |
505b2d90 | 1251 | goto end; |
ab0ee2ca JG |
1252 | } |
1253 | ||
505b2d90 | 1254 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 1255 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
091fa780 | 1256 | &client_list->clients_list, node) { |
505b2d90 | 1257 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1258 | continue; |
1259 | } | |
1260 | cds_list_del(&client_list_element->node); | |
1261 | free(client_list_element); | |
1262 | break; | |
1263 | } | |
505b2d90 JG |
1264 | pthread_mutex_unlock(&client_list->lock); |
1265 | notification_client_list_put(client_list); | |
1266 | client_list = NULL; | |
ab0ee2ca JG |
1267 | end: |
1268 | lttng_condition_destroy(condition); | |
1269 | if (_status) { | |
1270 | *_status = status; | |
1271 | } | |
1272 | return 0; | |
1273 | } | |
1274 | ||
83b934ad MD |
1275 | static |
1276 | void free_notification_client_rcu(struct rcu_head *node) | |
1277 | { | |
1278 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1279 | } | |
1280 | ||
ab0ee2ca JG |
1281 | static |
1282 | void notification_client_destroy(struct notification_client *client, | |
1283 | struct notification_thread_state *state) | |
1284 | { | |
ab0ee2ca JG |
1285 | if (!client) { |
1286 | return; | |
1287 | } | |
1288 | ||
505b2d90 JG |
1289 | /* |
1290 | * The client object is not reachable by other threads, no need to lock | |
1291 | * the client here. | |
1292 | */ | |
ab0ee2ca JG |
1293 | if (client->socket >= 0) { |
1294 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1295 | client->socket = -1; |
ab0ee2ca | 1296 | } |
505b2d90 | 1297 | client->communication.active = false; |
882093ee JR |
1298 | lttng_payload_reset(&client->communication.inbound.payload); |
1299 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1300 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1301 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1302 | } |
1303 | ||
1304 | /* | |
1305 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1306 | * client pointer). | |
1307 | */ | |
1308 | static | |
1309 | struct notification_client *get_client_from_socket(int socket, | |
1310 | struct notification_thread_state *state) | |
1311 | { | |
1312 | struct cds_lfht_iter iter; | |
1313 | struct cds_lfht_node *node; | |
1314 | struct notification_client *client = NULL; | |
1315 | ||
1316 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1317 | hash_client_socket(socket), |
1318 | match_client_socket, | |
ab0ee2ca JG |
1319 | (void *) (unsigned long) socket, |
1320 | &iter); | |
1321 | node = cds_lfht_iter_get_node(&iter); | |
1322 | if (!node) { | |
1323 | goto end; | |
1324 | } | |
1325 | ||
1326 | client = caa_container_of(node, struct notification_client, | |
1327 | client_socket_ht_node); | |
1328 | end: | |
1329 | return client; | |
1330 | } | |
1331 | ||
f2b3ef9f JG |
1332 | /* |
1333 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1334 | * client pointer). | |
1335 | */ | |
1336 | static | |
1337 | struct notification_client *get_client_from_id(notification_client_id id, | |
1338 | struct notification_thread_state *state) | |
1339 | { | |
1340 | struct cds_lfht_iter iter; | |
1341 | struct cds_lfht_node *node; | |
1342 | struct notification_client *client = NULL; | |
1343 | ||
1344 | cds_lfht_lookup(state->client_id_ht, | |
1345 | hash_client_id(id), | |
1346 | match_client_id, | |
1347 | &id, | |
1348 | &iter); | |
1349 | node = cds_lfht_iter_get_node(&iter); | |
1350 | if (!node) { | |
1351 | goto end; | |
1352 | } | |
1353 | ||
1354 | client = caa_container_of(node, struct notification_client, | |
1355 | client_id_ht_node); | |
1356 | end: | |
1357 | return client; | |
1358 | } | |
1359 | ||
ab0ee2ca | 1360 | static |
e8360425 | 1361 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1362 | const struct lttng_condition *condition, |
1363 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1364 | { |
1365 | enum lttng_condition_status status; | |
e8360425 JD |
1366 | enum lttng_domain_type condition_domain; |
1367 | const char *condition_session_name = NULL; | |
1368 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1369 | |
e8360425 JD |
1370 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1371 | &condition_domain); | |
a0377dfe | 1372 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
e8360425 | 1373 | if (channel_info->key.domain != condition_domain) { |
ab0ee2ca JG |
1374 | goto fail; |
1375 | } | |
1376 | ||
e8360425 JD |
1377 | status = lttng_condition_buffer_usage_get_session_name( |
1378 | condition, &condition_session_name); | |
a0377dfe | 1379 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); |
e8360425 JD |
1380 | |
1381 | status = lttng_condition_buffer_usage_get_channel_name( | |
1382 | condition, &condition_channel_name); | |
a0377dfe | 1383 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); |
e8360425 JD |
1384 | |
1385 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1386 | goto fail; | |
1387 | } | |
1388 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1389 | goto fail; |
1390 | } | |
1391 | ||
e8360425 JD |
1392 | return true; |
1393 | fail: | |
1394 | return false; | |
1395 | } | |
1396 | ||
1397 | static | |
1398 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1399 | const struct lttng_condition *condition, |
1400 | const struct channel_info *channel_info) | |
e8360425 JD |
1401 | { |
1402 | enum lttng_condition_status status; | |
1403 | const char *condition_session_name = NULL; | |
1404 | ||
1405 | status = lttng_condition_session_consumed_size_get_session_name( | |
1406 | condition, &condition_session_name); | |
a0377dfe | 1407 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); |
e8360425 JD |
1408 | |
1409 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1410 | goto fail; |
1411 | } | |
1412 | ||
e8360425 JD |
1413 | return true; |
1414 | fail: | |
1415 | return false; | |
1416 | } | |
ab0ee2ca | 1417 | |
51eab943 JG |
1418 | static |
1419 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1420 | const struct channel_info *channel_info) | |
1421 | { | |
1422 | const struct lttng_condition *condition; | |
e8360425 | 1423 | bool trigger_applies; |
ab0ee2ca | 1424 | |
51eab943 | 1425 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1426 | if (!condition) { |
ab0ee2ca JG |
1427 | goto fail; |
1428 | } | |
e8360425 JD |
1429 | |
1430 | switch (lttng_condition_get_type(condition)) { | |
1431 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1432 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1433 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1434 | condition, channel_info); | |
1435 | break; | |
1436 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1437 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1438 | condition, channel_info); | |
1439 | break; | |
1440 | default: | |
ab0ee2ca JG |
1441 | goto fail; |
1442 | } | |
1443 | ||
e8360425 | 1444 | return trigger_applies; |
ab0ee2ca JG |
1445 | fail: |
1446 | return false; | |
1447 | } | |
1448 | ||
ed327204 JG |
1449 | /* Must be called with RCU read lock held. */ |
1450 | static | |
1451 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1452 | struct notification_thread_state *state, | |
1453 | const char *session_name) | |
1454 | { | |
1455 | struct lttng_session_trigger_list *list = NULL; | |
1456 | struct cds_lfht_node *node; | |
1457 | struct cds_lfht_iter iter; | |
1458 | ||
1459 | cds_lfht_lookup(state->session_triggers_ht, | |
1460 | hash_key_str(session_name, lttng_ht_seed), | |
1461 | match_session_trigger_list, | |
1462 | session_name, | |
1463 | &iter); | |
1464 | node = cds_lfht_iter_get_node(&iter); | |
1465 | if (!node) { | |
1466 | /* | |
1467 | * Not an error, the list of triggers applying to that session | |
1468 | * will be initialized when the session is created. | |
1469 | */ | |
bd0514a5 | 1470 | DBG("No trigger list found for session \"%s\" as it is not yet known to the notification system", |
ed327204 JG |
1471 | session_name); |
1472 | goto end; | |
1473 | } | |
1474 | ||
e742b055 | 1475 | list = caa_container_of(node, |
ed327204 JG |
1476 | struct lttng_session_trigger_list, |
1477 | session_triggers_ht_node); | |
1478 | end: | |
1479 | return list; | |
1480 | } | |
1481 | ||
ea9a44f0 JG |
1482 | /* |
1483 | * Allocate an empty lttng_session_trigger_list for the session named | |
1484 | * 'session_name'. | |
1485 | * | |
1486 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1487 | * It is the caller's responsability to ensure the session name is alive | |
1488 | * for as long as this list is. | |
1489 | */ | |
1490 | static | |
1491 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1492 | const char *session_name, | |
1493 | struct cds_lfht *session_triggers_ht) | |
1494 | { | |
1495 | struct lttng_session_trigger_list *list; | |
1496 | ||
7966af57 | 1497 | list = (lttng_session_trigger_list *) zmalloc(sizeof(*list)); |
ea9a44f0 JG |
1498 | if (!list) { |
1499 | goto end; | |
1500 | } | |
1501 | list->session_name = session_name; | |
1502 | CDS_INIT_LIST_HEAD(&list->list); | |
1503 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1504 | list->session_triggers_ht = session_triggers_ht; | |
1505 | ||
1506 | rcu_read_lock(); | |
1507 | /* Publish the list through the session_triggers_ht. */ | |
1508 | cds_lfht_add(session_triggers_ht, | |
1509 | hash_key_str(session_name, lttng_ht_seed), | |
1510 | &list->session_triggers_ht_node); | |
1511 | rcu_read_unlock(); | |
1512 | end: | |
1513 | return list; | |
1514 | } | |
1515 | ||
1516 | static | |
1517 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1518 | { | |
1519 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1520 | rcu_node)); | |
1521 | } | |
1522 | ||
1523 | static | |
1524 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1525 | { | |
1526 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1527 | ||
1528 | /* Empty the list element by element, and then free the list itself. */ | |
1529 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1530 | &list->list, node) { | |
1531 | cds_list_del(&trigger_list_element->node); | |
1532 | free(trigger_list_element); | |
1533 | } | |
1534 | rcu_read_lock(); | |
1535 | /* Unpublish the list from the session_triggers_ht. */ | |
1536 | cds_lfht_del(list->session_triggers_ht, | |
1537 | &list->session_triggers_ht_node); | |
1538 | rcu_read_unlock(); | |
1539 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1540 | } | |
1541 | ||
1542 | static | |
1543 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1544 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1545 | { |
1546 | int ret = 0; | |
1547 | struct lttng_trigger_list_element *new_element = | |
7966af57 | 1548 | (lttng_trigger_list_element *) zmalloc(sizeof(*new_element)); |
ea9a44f0 JG |
1549 | |
1550 | if (!new_element) { | |
1551 | ret = -1; | |
1552 | goto end; | |
1553 | } | |
1554 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1555 | new_element->trigger = trigger; | |
1556 | cds_list_add(&new_element->node, &list->list); | |
1557 | end: | |
1558 | return ret; | |
1559 | } | |
1560 | ||
1561 | static | |
1562 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1563 | const char *session_name) | |
1564 | { | |
1565 | bool applies = false; | |
1566 | const struct lttng_condition *condition; | |
1567 | ||
1568 | condition = lttng_trigger_get_const_condition(trigger); | |
1569 | switch (lttng_condition_get_type(condition)) { | |
1570 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1571 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1572 | { | |
1573 | enum lttng_condition_status condition_status; | |
1574 | const char *condition_session_name; | |
1575 | ||
1576 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1577 | condition, &condition_session_name); | |
1578 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 1579 | ERR("Failed to retrieve session rotation condition's session name"); |
ea9a44f0 JG |
1580 | goto end; |
1581 | } | |
1582 | ||
a0377dfe | 1583 | LTTNG_ASSERT(condition_session_name); |
ea9a44f0 JG |
1584 | applies = !strcmp(condition_session_name, session_name); |
1585 | break; | |
1586 | } | |
1587 | default: | |
1588 | goto end; | |
1589 | } | |
1590 | end: | |
1591 | return applies; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1596 | * all triggers that apply to the session named 'session_name'. | |
1597 | * | |
1598 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1599 | * It is the caller's responsability to ensure the session name is alive | |
1600 | * for as long as this list is. | |
1601 | */ | |
1602 | static | |
1603 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1604 | const struct notification_thread_state *state, | |
1605 | const char *session_name) | |
1606 | { | |
1607 | int trigger_count = 0; | |
1608 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1609 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1610 | struct cds_lfht_iter iter; | |
1611 | ||
1612 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1613 | state->session_triggers_ht); | |
1614 | ||
1615 | /* Add all triggers applying to the session named 'session_name'. */ | |
1616 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1617 | node) { | |
1618 | int ret; | |
1619 | ||
1620 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1621 | session_name)) { | |
1622 | continue; | |
1623 | } | |
1624 | ||
1625 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1626 | trigger_ht_element->trigger); | |
1627 | if (ret) { | |
1628 | goto error; | |
1629 | } | |
1630 | ||
1631 | trigger_count++; | |
1632 | } | |
1633 | ||
bd0514a5 | 1634 | DBG("Found %i triggers that apply to newly created session", |
ea9a44f0 JG |
1635 | trigger_count); |
1636 | return session_trigger_list; | |
1637 | error: | |
1638 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1639 | return NULL; | |
1640 | } | |
1641 | ||
8abe313a JG |
1642 | static |
1643 | struct session_info *find_or_create_session_info( | |
1644 | struct notification_thread_state *state, | |
1645 | const char *name, uid_t uid, gid_t gid) | |
1646 | { | |
1647 | struct session_info *session = NULL; | |
1648 | struct cds_lfht_node *node; | |
1649 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1650 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1651 | |
1652 | rcu_read_lock(); | |
1653 | cds_lfht_lookup(state->sessions_ht, | |
1654 | hash_key_str(name, lttng_ht_seed), | |
1655 | match_session, | |
1656 | name, | |
1657 | &iter); | |
1658 | node = cds_lfht_iter_get_node(&iter); | |
1659 | if (node) { | |
bd0514a5 | 1660 | DBG("Found session info of session \"%s\" (uid = %i, gid = %i)", |
8abe313a JG |
1661 | name, uid, gid); |
1662 | session = caa_container_of(node, struct session_info, | |
1663 | sessions_ht_node); | |
a0377dfe FD |
1664 | LTTNG_ASSERT(session->uid == uid); |
1665 | LTTNG_ASSERT(session->gid == gid); | |
1eee26c5 JG |
1666 | session_info_get(session); |
1667 | goto end; | |
ea9a44f0 JG |
1668 | } |
1669 | ||
1670 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1671 | if (!trigger_list) { | |
1672 | goto error; | |
8abe313a JG |
1673 | } |
1674 | ||
1eee26c5 JG |
1675 | session = session_info_create(name, uid, gid, trigger_list, |
1676 | state->sessions_ht); | |
8abe313a | 1677 | if (!session) { |
bd0514a5 | 1678 | ERR("Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", |
8abe313a | 1679 | name, uid, gid); |
b248644d | 1680 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1681 | goto error; |
8abe313a | 1682 | } |
ea9a44f0 | 1683 | trigger_list = NULL; |
577983cb JG |
1684 | |
1685 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1686 | &session->sessions_ht_node); |
1eee26c5 | 1687 | end: |
8abe313a JG |
1688 | rcu_read_unlock(); |
1689 | return session; | |
ea9a44f0 JG |
1690 | error: |
1691 | rcu_read_unlock(); | |
1692 | session_info_put(session); | |
1693 | return NULL; | |
8abe313a JG |
1694 | } |
1695 | ||
ab0ee2ca JG |
1696 | static |
1697 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1698 | struct notification_thread_state *state, |
1699 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1700 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1701 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1702 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1703 | { |
1704 | struct cds_list_head trigger_list; | |
8abe313a JG |
1705 | struct channel_info *new_channel_info = NULL; |
1706 | struct channel_key channel_key = { | |
1707 | .key = channel_key_int, | |
1708 | .domain = channel_domain, | |
1709 | }; | |
ab0ee2ca JG |
1710 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1711 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1712 | int trigger_count = 0; | |
1713 | struct cds_lfht_iter iter; | |
8abe313a | 1714 | struct session_info *session_info = NULL; |
ab0ee2ca | 1715 | |
bd0514a5 | 1716 | DBG("Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", |
8abe313a | 1717 | channel_name, session_name, channel_key_int, |
526200e4 | 1718 | lttng_domain_type_str(channel_domain)); |
ab0ee2ca JG |
1719 | |
1720 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1721 | ||
8abe313a JG |
1722 | session_info = find_or_create_session_info(state, session_name, |
1723 | session_uid, session_gid); | |
1724 | if (!session_info) { | |
a9577b76 | 1725 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1726 | goto error; |
1727 | } | |
1728 | ||
8abe313a JG |
1729 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1730 | channel_capacity, session_info); | |
1731 | if (!new_channel_info) { | |
1732 | goto error; | |
1733 | } | |
ab0ee2ca | 1734 | |
83b934ad | 1735 | rcu_read_lock(); |
ab0ee2ca JG |
1736 | /* Build a list of all triggers applying to the new channel. */ |
1737 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1738 | node) { | |
1739 | struct lttng_trigger_list_element *new_element; | |
1740 | ||
1741 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1742 | new_channel_info)) { |
ab0ee2ca JG |
1743 | continue; |
1744 | } | |
1745 | ||
7966af57 | 1746 | new_element = (lttng_trigger_list_element *) zmalloc(sizeof(*new_element)); |
ab0ee2ca | 1747 | if (!new_element) { |
83b934ad | 1748 | rcu_read_unlock(); |
ab0ee2ca JG |
1749 | goto error; |
1750 | } | |
1751 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1752 | new_element->trigger = trigger_ht_element->trigger; | |
1753 | cds_list_add(&new_element->node, &trigger_list); | |
1754 | trigger_count++; | |
1755 | } | |
83b934ad | 1756 | rcu_read_unlock(); |
ab0ee2ca | 1757 | |
bd0514a5 | 1758 | DBG("Found %i triggers that apply to newly added channel", |
ab0ee2ca | 1759 | trigger_count); |
7966af57 | 1760 | channel_trigger_list = (lttng_channel_trigger_list *) zmalloc(sizeof(*channel_trigger_list)); |
ab0ee2ca JG |
1761 | if (!channel_trigger_list) { |
1762 | goto error; | |
1763 | } | |
8abe313a | 1764 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1765 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1766 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1767 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1768 | ||
1769 | rcu_read_lock(); | |
1770 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1771 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1772 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1773 | &new_channel_info->channels_ht_node); |
1774 | /* | |
1775 | * Add the list of triggers associated with this channel to the | |
1776 | * channel_triggers_ht. | |
1777 | */ | |
1778 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1779 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1780 | &channel_trigger_list->channel_triggers_ht_node); |
1781 | rcu_read_unlock(); | |
1eee26c5 | 1782 | session_info_put(session_info); |
ab0ee2ca JG |
1783 | *cmd_result = LTTNG_OK; |
1784 | return 0; | |
1785 | error: | |
ab0ee2ca | 1786 | channel_info_destroy(new_channel_info); |
8abe313a | 1787 | session_info_put(session_info); |
ab0ee2ca JG |
1788 | return 1; |
1789 | } | |
1790 | ||
83b934ad MD |
1791 | static |
1792 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1793 | { | |
1794 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1795 | rcu_node)); | |
1796 | } | |
1797 | ||
1798 | static | |
1799 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1800 | { | |
1801 | free(caa_container_of(node, struct channel_state_sample, | |
1802 | rcu_node)); | |
1803 | } | |
1804 | ||
ab0ee2ca JG |
1805 | static |
1806 | int handle_notification_thread_command_remove_channel( | |
1807 | struct notification_thread_state *state, | |
1808 | uint64_t channel_key, enum lttng_domain_type domain, | |
1809 | enum lttng_error_code *cmd_result) | |
1810 | { | |
1811 | struct cds_lfht_node *node; | |
1812 | struct cds_lfht_iter iter; | |
1813 | struct lttng_channel_trigger_list *trigger_list; | |
1814 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1815 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1816 | struct channel_info *channel_info; | |
1817 | ||
bd0514a5 | 1818 | DBG("Removing channel key = %" PRIu64 " in %s domain", |
526200e4 | 1819 | channel_key, lttng_domain_type_str(domain)); |
ab0ee2ca JG |
1820 | |
1821 | rcu_read_lock(); | |
1822 | ||
1823 | cds_lfht_lookup(state->channel_triggers_ht, | |
1824 | hash_channel_key(&key), | |
1825 | match_channel_trigger_list, | |
1826 | &key, | |
1827 | &iter); | |
1828 | node = cds_lfht_iter_get_node(&iter); | |
1829 | /* | |
1830 | * There is a severe internal error if we are being asked to remove a | |
1831 | * channel that doesn't exist. | |
1832 | */ | |
1833 | if (!node) { | |
bd0514a5 | 1834 | ERR("Channel being removed is unknown to the notification thread"); |
ab0ee2ca JG |
1835 | goto end; |
1836 | } | |
1837 | ||
1838 | /* Free the list of triggers associated with this channel. */ | |
1839 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1840 | channel_triggers_ht_node); | |
1841 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1842 | &trigger_list->list, node) { | |
1843 | cds_list_del(&trigger_list_element->node); | |
1844 | free(trigger_list_element); | |
1845 | } | |
1846 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1847 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1848 | |
1849 | /* Free sampled channel state. */ | |
1850 | cds_lfht_lookup(state->channel_state_ht, | |
1851 | hash_channel_key(&key), | |
1852 | match_channel_state_sample, | |
1853 | &key, | |
1854 | &iter); | |
1855 | node = cds_lfht_iter_get_node(&iter); | |
1856 | /* | |
1857 | * This is expected to be NULL if the channel is destroyed before we | |
1858 | * received a sample. | |
1859 | */ | |
1860 | if (node) { | |
1861 | struct channel_state_sample *sample = caa_container_of(node, | |
1862 | struct channel_state_sample, | |
1863 | channel_state_ht_node); | |
1864 | ||
1865 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1866 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1867 | } |
1868 | ||
1869 | /* Remove the channel from the channels_ht and free it. */ | |
1870 | cds_lfht_lookup(state->channels_ht, | |
1871 | hash_channel_key(&key), | |
1872 | match_channel_info, | |
1873 | &key, | |
1874 | &iter); | |
1875 | node = cds_lfht_iter_get_node(&iter); | |
a0377dfe | 1876 | LTTNG_ASSERT(node); |
ab0ee2ca JG |
1877 | channel_info = caa_container_of(node, struct channel_info, |
1878 | channels_ht_node); | |
1879 | cds_lfht_del(state->channels_ht, node); | |
1880 | channel_info_destroy(channel_info); | |
1881 | end: | |
1882 | rcu_read_unlock(); | |
1883 | *cmd_result = LTTNG_OK; | |
1884 | return 0; | |
1885 | } | |
1886 | ||
0ca52944 | 1887 | static |
ed327204 | 1888 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1889 | struct notification_thread_state *state, |
ed327204 JG |
1890 | enum notification_thread_command_type cmd_type, |
1891 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1892 | uint64_t trace_archive_chunk_id, | |
1893 | struct lttng_trace_archive_location *location, | |
1894 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1895 | { |
ed327204 JG |
1896 | int ret = 0; |
1897 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1898 | struct lttng_session_trigger_list *trigger_list; | |
1899 | struct lttng_trigger_list_element *trigger_list_element; | |
1900 | struct session_info *session_info; | |
f2b3ef9f | 1901 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1902 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1903 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1904 | }; |
0ca52944 | 1905 | |
ed327204 JG |
1906 | rcu_read_lock(); |
1907 | ||
1908 | session_info = find_or_create_session_info(state, session_name, | |
1909 | session_uid, session_gid); | |
1910 | if (!session_info) { | |
a9577b76 | 1911 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1912 | ret = -1; |
1913 | cmd_result = LTTNG_ERR_NOMEM; | |
1914 | goto end; | |
1915 | } | |
1916 | ||
1917 | session_info->rotation.ongoing = | |
1918 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1919 | session_info->rotation.id = trace_archive_chunk_id; | |
1920 | trigger_list = get_session_trigger_list(state, session_name); | |
1921 | if (!trigger_list) { | |
bd0514a5 | 1922 | DBG("No triggers applying to session \"%s\" found", |
ed327204 JG |
1923 | session_name); |
1924 | goto end; | |
1925 | } | |
1926 | ||
1927 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1928 | node) { | |
1929 | const struct lttng_condition *condition; | |
f2b3ef9f | 1930 | struct lttng_trigger *trigger; |
ed327204 JG |
1931 | struct notification_client_list *client_list; |
1932 | struct lttng_evaluation *evaluation = NULL; | |
1933 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1934 | enum action_executor_status executor_status; |
ed327204 JG |
1935 | |
1936 | trigger = trigger_list_element->trigger; | |
1937 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 1938 | LTTNG_ASSERT(condition); |
ed327204 JG |
1939 | condition_type = lttng_condition_get_type(condition); |
1940 | ||
1941 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1942 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1943 | continue; | |
1944 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1945 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1946 | continue; | |
1947 | } | |
1948 | ||
ed327204 | 1949 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1950 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1951 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1952 | trace_archive_chunk_id); | |
1953 | } else { | |
1954 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1955 | trace_archive_chunk_id, location); | |
1956 | } | |
1957 | ||
1958 | if (!evaluation) { | |
1959 | /* Internal error */ | |
1960 | ret = -1; | |
1961 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1962 | goto put_list; |
ed327204 JG |
1963 | } |
1964 | ||
f2b3ef9f JG |
1965 | /* |
1966 | * Ownership of `evaluation` transferred to the action executor | |
1967 | * no matter the result. | |
1968 | */ | |
72365501 JR |
1969 | executor_status = action_executor_enqueue_trigger( |
1970 | state->executor, trigger, evaluation, | |
1971 | &session_creds, client_list); | |
f2b3ef9f JG |
1972 | evaluation = NULL; |
1973 | switch (executor_status) { | |
1974 | case ACTION_EXECUTOR_STATUS_OK: | |
1975 | break; | |
1976 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1977 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1978 | /* | |
1979 | * TODO Add trigger identification (name/id) when | |
1980 | * it is added to the API. | |
1981 | */ | |
1982 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1983 | ret = -1; | |
1984 | goto put_list; | |
1985 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1986 | /* | |
1987 | * TODO Add trigger identification (name/id) when | |
1988 | * it is added to the API. | |
1989 | * | |
1990 | * Not a fatal error. | |
1991 | */ | |
1992 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1993 | ret = 0; | |
1994 | goto put_list; | |
1995 | default: | |
1996 | abort(); | |
1997 | } | |
1998 | ||
505b2d90 JG |
1999 | put_list: |
2000 | notification_client_list_put(client_list); | |
ed327204 | 2001 | if (caa_unlikely(ret)) { |
505b2d90 | 2002 | break; |
ed327204 JG |
2003 | } |
2004 | } | |
2005 | end: | |
2006 | session_info_put(session_info); | |
2007 | *_cmd_result = cmd_result; | |
2008 | rcu_read_unlock(); | |
2009 | return ret; | |
0ca52944 JG |
2010 | } |
2011 | ||
d02d7404 JR |
2012 | static |
2013 | int handle_notification_thread_command_add_tracer_event_source( | |
2014 | struct notification_thread_state *state, | |
2015 | int tracer_event_source_fd, | |
2016 | enum lttng_domain_type domain_type, | |
2017 | enum lttng_error_code *_cmd_result) | |
2018 | { | |
2019 | int ret = 0; | |
2020 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2021 | struct notification_event_tracer_event_source_element *element = NULL; | |
2022 | ||
7966af57 | 2023 | element = (notification_event_tracer_event_source_element *) zmalloc(sizeof(*element)); |
d02d7404 JR |
2024 | if (!element) { |
2025 | cmd_result = LTTNG_ERR_NOMEM; | |
2026 | ret = -1; | |
2027 | goto end; | |
2028 | } | |
2029 | ||
d02d7404 JR |
2030 | element->fd = tracer_event_source_fd; |
2031 | element->domain = domain_type; | |
2032 | ||
2033 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
2034 | ||
bd0514a5 | 2035 | DBG3("Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
2036 | tracer_event_source_fd, |
2037 | lttng_domain_type_str(domain_type)); | |
2038 | ||
2039 | /* Adding the read side pipe to the event poll. */ | |
2040 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLIN | LPOLLERR); | |
2041 | if (ret < 0) { | |
bd0514a5 | 2042 | ERR("Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
2043 | tracer_event_source_fd, |
2044 | lttng_domain_type_str(element->domain)); | |
2045 | cds_list_del(&element->node); | |
2046 | free(element); | |
2047 | goto end; | |
2048 | } | |
2049 | ||
2050 | element->is_fd_in_poll_set = true; | |
2051 | ||
2052 | end: | |
2053 | *_cmd_result = cmd_result; | |
2054 | return ret; | |
2055 | } | |
2056 | ||
8b524060 FD |
2057 | static |
2058 | int drain_event_notifier_notification_pipe( | |
2059 | struct notification_thread_state *state, | |
2060 | int pipe, enum lttng_domain_type domain) | |
2061 | { | |
2062 | struct lttng_poll_event events = {0}; | |
2063 | int ret; | |
2064 | ||
2065 | ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC); | |
2066 | if (ret < 0) { | |
bd0514a5 | 2067 | ERR("Error creating lttng_poll_event"); |
8b524060 FD |
2068 | goto end; |
2069 | } | |
2070 | ||
2071 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2072 | if (ret < 0) { | |
bd0514a5 | 2073 | ERR("Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", |
8b524060 FD |
2074 | pipe); |
2075 | goto end; | |
2076 | } | |
2077 | ||
2078 | while (true) { | |
2079 | /* | |
2080 | * Continue to consume notifications as long as there are new | |
2081 | * ones coming in. The tracer has been asked to stop producing | |
2082 | * them. | |
2083 | * | |
2084 | * LPOLLIN is explicitly checked since LPOLLHUP is implicitly | |
2085 | * monitored (on Linux, at least) and will be returned when | |
2086 | * the pipe is closed but empty. | |
2087 | */ | |
2088 | ret = lttng_poll_wait_interruptible(&events, 0); | |
a17b133b | 2089 | if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) { |
8b524060 FD |
2090 | /* No more notification to be read on this pipe. */ |
2091 | ret = 0; | |
2092 | goto end; | |
2093 | } else if (ret < 0) { | |
2094 | PERROR("Failed on lttng_poll_wait_interruptible() call"); | |
2095 | ret = -1; | |
2096 | goto end; | |
2097 | } | |
2098 | ||
2099 | ret = handle_one_event_notifier_notification(state, pipe, domain); | |
2100 | if (ret) { | |
bd0514a5 | 2101 | ERR("Error consuming an event notifier notification from pipe: fd = %d", |
8b524060 FD |
2102 | pipe); |
2103 | } | |
2104 | } | |
2105 | end: | |
2106 | lttng_poll_clean(&events); | |
2107 | return ret; | |
2108 | } | |
2109 | ||
d02d7404 | 2110 | static |
34bf4f69 FD |
2111 | struct notification_event_tracer_event_source_element * |
2112 | find_tracer_event_source_element(struct notification_thread_state *state, | |
2113 | int tracer_event_source_fd) | |
d02d7404 | 2114 | { |
34bf4f69 | 2115 | struct notification_event_tracer_event_source_element *source_element; |
d02d7404 | 2116 | |
34bf4f69 | 2117 | cds_list_for_each_entry(source_element, |
d02d7404 | 2118 | &state->tracer_event_sources_list, node) { |
34bf4f69 FD |
2119 | if (source_element->fd == tracer_event_source_fd) { |
2120 | goto end; | |
d02d7404 | 2121 | } |
d02d7404 JR |
2122 | } |
2123 | ||
34bf4f69 FD |
2124 | source_element = NULL; |
2125 | end: | |
97cf926d | 2126 | return source_element; |
34bf4f69 | 2127 | } |
d02d7404 | 2128 | |
34bf4f69 FD |
2129 | static |
2130 | int remove_tracer_event_source_from_pollset( | |
2131 | struct notification_thread_state *state, | |
2132 | struct notification_event_tracer_event_source_element *source_element) | |
2133 | { | |
2134 | int ret = 0; | |
2135 | ||
a0377dfe | 2136 | LTTNG_ASSERT(source_element->is_fd_in_poll_set); |
d02d7404 | 2137 | |
bd0514a5 | 2138 | DBG3("Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
34bf4f69 | 2139 | source_element->fd, |
d02d7404 JR |
2140 | lttng_domain_type_str(source_element->domain)); |
2141 | ||
2142 | /* Removing the fd from the event poll set. */ | |
34bf4f69 | 2143 | ret = lttng_poll_del(&state->events, source_element->fd); |
d02d7404 | 2144 | if (ret < 0) { |
bd0514a5 | 2145 | ERR("Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
34bf4f69 | 2146 | source_element->fd, |
d02d7404 | 2147 | lttng_domain_type_str(source_element->domain)); |
34bf4f69 | 2148 | ret = -1; |
d02d7404 JR |
2149 | goto end; |
2150 | } | |
2151 | ||
173900f6 JG |
2152 | source_element->is_fd_in_poll_set = false; |
2153 | ||
2ddbdc7a FD |
2154 | /* |
2155 | * Force the notification thread to restart the poll() loop to ensure | |
2156 | * that any events from the removed fd are removed. | |
2157 | */ | |
2158 | state->restart_poll = true; | |
2159 | ||
34bf4f69 | 2160 | ret = drain_event_notifier_notification_pipe(state, source_element->fd, |
8b524060 FD |
2161 | source_element->domain); |
2162 | if (ret) { | |
bd0514a5 | 2163 | ERR("Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", |
34bf4f69 | 2164 | source_element->fd, |
8b524060 | 2165 | lttng_domain_type_str(source_element->domain)); |
34bf4f69 | 2166 | ret = -1; |
8b524060 FD |
2167 | goto end; |
2168 | } | |
2169 | ||
d02d7404 | 2170 | end: |
d02d7404 JR |
2171 | return ret; |
2172 | } | |
2173 | ||
34bf4f69 | 2174 | int handle_notification_thread_tracer_event_source_died( |
d02d7404 JR |
2175 | struct notification_thread_state *state, |
2176 | int tracer_event_source_fd) | |
2177 | { | |
34bf4f69 FD |
2178 | int ret = 0; |
2179 | struct notification_event_tracer_event_source_element *source_element; | |
2180 | ||
2181 | source_element = find_tracer_event_source_element(state, | |
2182 | tracer_event_source_fd); | |
2183 | ||
a0377dfe | 2184 | LTTNG_ASSERT(source_element); |
34bf4f69 FD |
2185 | |
2186 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2187 | if (ret) { | |
2188 | ERR("Failed to remove dead tracer event source from poll set"); | |
2189 | } | |
d02d7404 | 2190 | |
34bf4f69 FD |
2191 | return ret; |
2192 | } | |
2193 | ||
2194 | static | |
2195 | int handle_notification_thread_command_remove_tracer_event_source( | |
2196 | struct notification_thread_state *state, | |
2197 | int tracer_event_source_fd, | |
2198 | enum lttng_error_code *_cmd_result) | |
2199 | { | |
2200 | int ret = 0; | |
2201 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2202 | struct notification_event_tracer_event_source_element *source_element = NULL; | |
2203 | ||
2204 | source_element = find_tracer_event_source_element(state, | |
2205 | tracer_event_source_fd); | |
2206 | ||
a0377dfe | 2207 | LTTNG_ASSERT(source_element); |
34bf4f69 FD |
2208 | |
2209 | /* Remove the tracer source from the list. */ | |
2210 | cds_list_del(&source_element->node); | |
2211 | ||
2212 | if (!source_element->is_fd_in_poll_set) { | |
2213 | /* Skip the poll set removal. */ | |
2214 | goto end; | |
2215 | } | |
2216 | ||
2217 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2218 | if (ret) { | |
2219 | ERR("Failed to remove tracer event source from poll set"); | |
2220 | cmd_result = LTTNG_ERR_FATAL; | |
2221 | } | |
2222 | ||
2223 | end: | |
2224 | free(source_element); | |
2225 | *_cmd_result = cmd_result; | |
d02d7404 JR |
2226 | return ret; |
2227 | } | |
2228 | ||
fbc9f37d JR |
2229 | static int handle_notification_thread_command_list_triggers( |
2230 | struct notification_thread_handle *handle, | |
2231 | struct notification_thread_state *state, | |
2232 | uid_t client_uid, | |
2233 | struct lttng_triggers **triggers, | |
2234 | enum lttng_error_code *_cmd_result) | |
2235 | { | |
2236 | int ret = 0; | |
2237 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2238 | struct cds_lfht_iter iter; | |
2239 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2240 | struct lttng_triggers *local_triggers = NULL; | |
2241 | const struct lttng_credentials *creds; | |
2242 | ||
2243 | rcu_read_lock(); | |
2244 | ||
2245 | local_triggers = lttng_triggers_create(); | |
2246 | if (!local_triggers) { | |
2247 | /* Not a fatal error. */ | |
2248 | cmd_result = LTTNG_ERR_NOMEM; | |
2249 | goto end; | |
2250 | } | |
2251 | ||
2252 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2253 | trigger_ht_element, node) { | |
2254 | /* | |
2255 | * Only return the triggers to which the client has access. | |
2256 | * The root user has visibility over all triggers. | |
2257 | */ | |
2258 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2259 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2260 | continue; | |
2261 | } | |
2262 | ||
2263 | ret = lttng_triggers_add(local_triggers, | |
2264 | trigger_ht_element->trigger); | |
2265 | if (ret < 0) { | |
2266 | /* Not a fatal error. */ | |
2267 | ret = 0; | |
2268 | cmd_result = LTTNG_ERR_NOMEM; | |
2269 | goto end; | |
2270 | } | |
2271 | } | |
2272 | ||
2273 | /* Transferring ownership to the caller. */ | |
2274 | *triggers = local_triggers; | |
2275 | local_triggers = NULL; | |
2276 | ||
2277 | end: | |
2278 | rcu_read_unlock(); | |
2279 | lttng_triggers_destroy(local_triggers); | |
2280 | *_cmd_result = cmd_result; | |
2281 | return ret; | |
2282 | } | |
2283 | ||
8790759c FD |
2284 | static inline void get_trigger_info_for_log(const struct lttng_trigger *trigger, |
2285 | const char **trigger_name, | |
2286 | uid_t *trigger_owner_uid) | |
2287 | { | |
2288 | enum lttng_trigger_status trigger_status; | |
2289 | ||
2290 | trigger_status = lttng_trigger_get_name(trigger, trigger_name); | |
2291 | switch (trigger_status) { | |
2292 | case LTTNG_TRIGGER_STATUS_OK: | |
2293 | break; | |
2294 | case LTTNG_TRIGGER_STATUS_UNSET: | |
0efb2ad7 | 2295 | *trigger_name = "(anonymous)"; |
8790759c FD |
2296 | break; |
2297 | default: | |
2298 | abort(); | |
2299 | } | |
2300 | ||
2301 | trigger_status = lttng_trigger_get_owner_uid(trigger, | |
2302 | trigger_owner_uid); | |
a0377dfe | 2303 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
8790759c FD |
2304 | } |
2305 | ||
2306 | static int handle_notification_thread_command_get_trigger( | |
2307 | struct notification_thread_state *state, | |
2308 | const struct lttng_trigger *trigger, | |
2309 | struct lttng_trigger **registered_trigger, | |
2310 | enum lttng_error_code *_cmd_result) | |
2311 | { | |
2312 | int ret = -1; | |
2313 | struct cds_lfht_iter iter; | |
2314 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2315 | enum lttng_error_code cmd_result = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2316 | const char *trigger_name; | |
2317 | uid_t trigger_owner_uid; | |
2318 | ||
2319 | rcu_read_lock(); | |
2320 | ||
2321 | cds_lfht_for_each_entry( | |
2322 | state->triggers_ht, &iter, trigger_ht_element, node) { | |
2323 | if (lttng_trigger_is_equal( | |
2324 | trigger, trigger_ht_element->trigger)) { | |
2325 | /* Take one reference on the return trigger. */ | |
2326 | *registered_trigger = trigger_ht_element->trigger; | |
2327 | lttng_trigger_get(*registered_trigger); | |
2328 | ret = 0; | |
2329 | cmd_result = LTTNG_OK; | |
2330 | goto end; | |
2331 | } | |
2332 | } | |
2333 | ||
2334 | /* Not a fatal error if the trigger is not found. */ | |
2335 | get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid); | |
87661585 | 2336 | DBG("Failed to retrieve registered version of trigger: trigger name = '%s', trigger owner uid = %d", |
8790759c FD |
2337 | trigger_name, (int) trigger_owner_uid); |
2338 | ||
2339 | ret = 0; | |
2340 | ||
2341 | end: | |
2342 | rcu_read_unlock(); | |
2343 | *_cmd_result = cmd_result; | |
2344 | return ret; | |
2345 | } | |
2346 | ||
1da26331 | 2347 | static |
959e3c66 | 2348 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2349 | { |
959e3c66 | 2350 | bool is_supported; |
1da26331 JG |
2351 | |
2352 | switch (lttng_condition_get_type(condition)) { | |
2353 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2354 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2355 | { | |
959e3c66 | 2356 | int ret; |
1da26331 JG |
2357 | enum lttng_domain_type domain; |
2358 | ||
2359 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2360 | &domain); | |
a0377dfe | 2361 | LTTNG_ASSERT(ret == 0); |
1da26331 JG |
2362 | |
2363 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2364 | is_supported = true; |
1da26331 JG |
2365 | goto end; |
2366 | } | |
2367 | ||
2368 | /* | |
2369 | * Older kernel tracers don't expose the API to monitor their | |
2370 | * buffers. Therefore, we reject triggers that require that | |
2371 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2372 | * |
2373 | * Assume unsupported on error. | |
1da26331 | 2374 | */ |
959e3c66 JR |
2375 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2376 | break; | |
2377 | } | |
8dbb86b8 | 2378 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 JR |
2379 | { |
2380 | const struct lttng_event_rule *event_rule; | |
2381 | enum lttng_domain_type domain; | |
2382 | const enum lttng_condition_status status = | |
8dbb86b8 | 2383 | lttng_condition_event_rule_matches_get_rule( |
959e3c66 JR |
2384 | condition, &event_rule); |
2385 | ||
a0377dfe | 2386 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
959e3c66 JR |
2387 | |
2388 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2389 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2390 | is_supported = true; | |
2391 | goto end; | |
2392 | } | |
2393 | ||
2394 | /* | |
2395 | * Older kernel tracers can't emit notification. Therefore, we | |
2396 | * reject triggers that require that mechanism to be available | |
2397 | * to be evaluated. | |
2398 | * | |
2399 | * Assume unsupported on error. | |
2400 | */ | |
2401 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2402 | break; |
2403 | } | |
2404 | default: | |
959e3c66 | 2405 | is_supported = true; |
1da26331 JG |
2406 | } |
2407 | end: | |
959e3c66 | 2408 | return is_supported; |
1da26331 JG |
2409 | } |
2410 | ||
51eab943 JG |
2411 | /* Must be called with RCU read lock held. */ |
2412 | static | |
f2b3ef9f | 2413 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2414 | struct notification_thread_state *state) |
2415 | { | |
2416 | int ret = 0; | |
51eab943 JG |
2417 | const struct lttng_condition *condition; |
2418 | const char *session_name; | |
2419 | struct lttng_session_trigger_list *trigger_list; | |
2420 | ||
2421 | condition = lttng_trigger_get_const_condition(trigger); | |
2422 | switch (lttng_condition_get_type(condition)) { | |
2423 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2424 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2425 | { | |
2426 | enum lttng_condition_status status; | |
2427 | ||
2428 | status = lttng_condition_session_rotation_get_session_name( | |
2429 | condition, &session_name); | |
2430 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 2431 | ERR("Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); |
51eab943 JG |
2432 | ret = -1; |
2433 | goto end; | |
2434 | } | |
2435 | break; | |
2436 | } | |
2437 | default: | |
2438 | ret = -1; | |
2439 | goto end; | |
2440 | } | |
2441 | ||
ed327204 JG |
2442 | trigger_list = get_session_trigger_list(state, session_name); |
2443 | if (!trigger_list) { | |
bd0514a5 | 2444 | DBG("Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
51eab943 JG |
2445 | session_name); |
2446 | goto end; | |
51eab943 | 2447 | |
ed327204 | 2448 | } |
51eab943 | 2449 | |
bd0514a5 | 2450 | DBG("Newly registered trigger bound to session \"%s\"", |
51eab943 JG |
2451 | session_name); |
2452 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2453 | end: | |
2454 | return ret; | |
2455 | } | |
2456 | ||
2457 | /* Must be called with RCU read lock held. */ | |
2458 | static | |
f2b3ef9f | 2459 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2460 | struct notification_thread_state *state) |
2461 | { | |
2462 | int ret = 0; | |
2463 | struct cds_lfht_node *node; | |
2464 | struct cds_lfht_iter iter; | |
2465 | struct channel_info *channel; | |
2466 | ||
2467 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2468 | channels_ht_node) { | |
2469 | struct lttng_trigger_list_element *trigger_list_element; | |
2470 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2471 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2472 | |
2473 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2474 | continue; | |
2475 | } | |
2476 | ||
2477 | cds_lfht_lookup(state->channel_triggers_ht, | |
2478 | hash_channel_key(&channel->key), | |
2479 | match_channel_trigger_list, | |
2480 | &channel->key, | |
a5d64ae7 MD |
2481 | &lookup_iter); |
2482 | node = cds_lfht_iter_get_node(&lookup_iter); | |
a0377dfe | 2483 | LTTNG_ASSERT(node); |
51eab943 JG |
2484 | trigger_list = caa_container_of(node, |
2485 | struct lttng_channel_trigger_list, | |
2486 | channel_triggers_ht_node); | |
2487 | ||
7966af57 | 2488 | trigger_list_element = (lttng_trigger_list_element *) zmalloc(sizeof(*trigger_list_element)); |
51eab943 JG |
2489 | if (!trigger_list_element) { |
2490 | ret = -1; | |
2491 | goto end; | |
2492 | } | |
2493 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2494 | trigger_list_element->trigger = trigger; | |
2495 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
bd0514a5 | 2496 | DBG("Newly registered trigger bound to channel \"%s\"", |
51eab943 JG |
2497 | channel->name); |
2498 | } | |
2499 | end: | |
2500 | return ret; | |
2501 | } | |
2502 | ||
f2b3ef9f JG |
2503 | static |
2504 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2505 | { | |
2506 | bool is_notify = false; | |
2507 | unsigned int i, count; | |
2508 | enum lttng_action_status action_status; | |
2509 | const struct lttng_action *action = | |
2510 | lttng_trigger_get_const_action(trigger); | |
2511 | enum lttng_action_type action_type; | |
2512 | ||
a0377dfe | 2513 | LTTNG_ASSERT(action); |
17182cfd | 2514 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2515 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2516 | is_notify = true; | |
2517 | goto end; | |
7c2fae7c | 2518 | } else if (action_type != LTTNG_ACTION_TYPE_LIST) { |
f2b3ef9f JG |
2519 | goto end; |
2520 | } | |
2521 | ||
702f26c8 | 2522 | action_status = lttng_action_list_get_count(action, &count); |
a0377dfe | 2523 | LTTNG_ASSERT(action_status == LTTNG_ACTION_STATUS_OK); |
f2b3ef9f JG |
2524 | |
2525 | for (i = 0; i < count; i++) { | |
2526 | const struct lttng_action *inner_action = | |
702f26c8 | 2527 | lttng_action_list_get_at_index( |
f2b3ef9f JG |
2528 | action, i); |
2529 | ||
17182cfd | 2530 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2531 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2532 | is_notify = true; | |
2533 | goto end; | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | end: | |
2538 | return is_notify; | |
2539 | } | |
2540 | ||
242388e4 JR |
2541 | static bool trigger_name_taken(struct notification_thread_state *state, |
2542 | const struct lttng_trigger *trigger) | |
2543 | { | |
2544 | struct cds_lfht_iter iter; | |
2545 | ||
2546 | /* | |
2547 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2548 | * The match is done against the trigger name and uid. | |
2549 | */ | |
2550 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2551 | hash_trigger_by_name_uid(trigger), | |
2552 | match_trigger_by_name_uid, | |
2553 | trigger, | |
2554 | &iter); | |
2555 | return !!cds_lfht_iter_get_node(&iter); | |
2556 | } | |
2557 | ||
2558 | static | |
2559 | enum lttng_error_code generate_trigger_name( | |
2560 | struct notification_thread_state *state, | |
2561 | struct lttng_trigger *trigger, const char **name) | |
2562 | { | |
2563 | enum lttng_error_code ret_code = LTTNG_OK; | |
2564 | bool taken = false; | |
2565 | enum lttng_trigger_status status; | |
2566 | ||
2567 | do { | |
2568 | const int ret = lttng_trigger_generate_name(trigger, | |
2569 | state->trigger_id.name_offset++); | |
2570 | if (ret) { | |
2571 | /* The only reason this can fail right now. */ | |
2572 | ret_code = LTTNG_ERR_NOMEM; | |
2573 | break; | |
2574 | } | |
2575 | ||
2576 | status = lttng_trigger_get_name(trigger, name); | |
a0377dfe | 2577 | LTTNG_ASSERT(status == LTTNG_TRIGGER_STATUS_OK); |
242388e4 JR |
2578 | |
2579 | taken = trigger_name_taken(state, trigger); | |
2580 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2581 | ||
2582 | return ret_code; | |
2583 | } | |
2584 | ||
2758e38b FD |
2585 | static inline |
2586 | void notif_thread_state_remove_trigger_ht_elem( | |
2587 | struct notification_thread_state *state, | |
2588 | struct lttng_trigger_ht_element *trigger_ht_element) | |
2589 | { | |
a0377dfe FD |
2590 | LTTNG_ASSERT(state); |
2591 | LTTNG_ASSERT(trigger_ht_element); | |
2758e38b FD |
2592 | |
2593 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2594 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); | |
2595 | } | |
2596 | ||
6487ad53 FD |
2597 | static |
2598 | enum lttng_error_code setup_tracer_notifier( | |
2599 | struct notification_thread_state *state, | |
2600 | struct lttng_trigger *trigger) | |
2601 | { | |
2602 | enum lttng_error_code ret; | |
2603 | enum event_notifier_error_accounting_status error_accounting_status; | |
2604 | struct cds_lfht_node *node; | |
2605 | uint64_t error_counter_index = 0; | |
2606 | struct lttng_condition *condition = lttng_trigger_get_condition(trigger); | |
2607 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; | |
2608 | ||
7966af57 | 2609 | trigger_tokens_ht_element = (notification_trigger_tokens_ht_element *) zmalloc(sizeof(*trigger_tokens_ht_element)); |
6487ad53 FD |
2610 | if (!trigger_tokens_ht_element) { |
2611 | ret = LTTNG_ERR_NOMEM; | |
2612 | goto end; | |
2613 | } | |
2614 | ||
2615 | /* Add trigger token to the trigger_tokens_ht. */ | |
2616 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2617 | trigger_tokens_ht_element->token = LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2618 | trigger_tokens_ht_element->trigger = trigger; | |
2619 | ||
2620 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2621 | hash_key_u64(&trigger_tokens_ht_element->token, lttng_ht_seed), | |
2622 | match_trigger_token, | |
2623 | &trigger_tokens_ht_element->token, | |
2624 | &trigger_tokens_ht_element->node); | |
2625 | if (node != &trigger_tokens_ht_element->node) { | |
2626 | ret = LTTNG_ERR_TRIGGER_EXISTS; | |
2627 | goto error_free_ht_element; | |
2628 | } | |
2629 | ||
2630 | error_accounting_status = event_notifier_error_accounting_register_event_notifier( | |
2631 | trigger, &error_counter_index); | |
2632 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2633 | if (error_accounting_status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE) { | |
7c2fae7c | 2634 | DBG("Trigger list error accounting counter full."); |
6487ad53 FD |
2635 | ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING_FULL; |
2636 | } else { | |
2637 | ERR("Error registering trigger for error accounting"); | |
2638 | ret = LTTNG_ERR_EVENT_NOTIFIER_REGISTRATION; | |
2639 | } | |
2640 | ||
2641 | goto error_remove_ht_element; | |
2642 | } | |
2643 | ||
8dbb86b8 | 2644 | lttng_condition_event_rule_matches_set_error_counter_index( |
6487ad53 FD |
2645 | condition, error_counter_index); |
2646 | ||
2647 | ret = LTTNG_OK; | |
2648 | goto end; | |
2649 | ||
2650 | error_remove_ht_element: | |
2651 | cds_lfht_del(state->trigger_tokens_ht, &trigger_tokens_ht_element->node); | |
2652 | error_free_ht_element: | |
2653 | free(trigger_tokens_ht_element); | |
2654 | end: | |
2655 | return ret; | |
2656 | } | |
2657 | ||
ab0ee2ca | 2658 | /* |
f2b3ef9f | 2659 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2660 | * |
1da26331 | 2661 | * The effects of this are benign since: |
ab0ee2ca | 2662 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2663 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2664 | * - The notifications will not be sent since the client's credentials |
2665 | * are checked against the channel at that moment. | |
1da26331 JG |
2666 | * |
2667 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2668 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2669 | * |
2670 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2671 | * error code. | |
ab0ee2ca JG |
2672 | */ |
2673 | static | |
2674 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2675 | struct notification_thread_state *state, |
2676 | struct lttng_trigger *trigger, | |
0efb2ad7 | 2677 | bool is_trigger_anonymous, |
8abe313a | 2678 | enum lttng_error_code *cmd_result) |
ab0ee2ca JG |
2679 | { |
2680 | int ret = 0; | |
2681 | struct lttng_condition *condition; | |
ab0ee2ca JG |
2682 | struct notification_client_list *client_list = NULL; |
2683 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
ab0ee2ca | 2684 | struct cds_lfht_node *node; |
242388e4 | 2685 | const char* trigger_name; |
ab0ee2ca | 2686 | bool free_trigger = true; |
f2b3ef9f JG |
2687 | struct lttng_evaluation *evaluation = NULL; |
2688 | struct lttng_credentials object_creds; | |
ff588497 JR |
2689 | uid_t object_uid; |
2690 | gid_t object_gid; | |
f2b3ef9f | 2691 | enum action_executor_status executor_status; |
e6887944 JR |
2692 | const uint64_t trigger_tracer_token = |
2693 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2694 | |
2695 | rcu_read_lock(); | |
2696 | ||
e6887944 JR |
2697 | /* Set the trigger's tracer token. */ |
2698 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2699 | ||
0efb2ad7 JG |
2700 | if (!is_trigger_anonymous) { |
2701 | if (lttng_trigger_get_name(trigger, &trigger_name) == | |
2702 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2703 | const enum lttng_error_code ret_code = | |
2704 | generate_trigger_name(state, trigger, | |
2705 | &trigger_name); | |
242388e4 | 2706 | |
0efb2ad7 JG |
2707 | if (ret_code != LTTNG_OK) { |
2708 | /* Fatal error. */ | |
2709 | ret = -1; | |
2710 | *cmd_result = ret_code; | |
2711 | goto error; | |
2712 | } | |
2713 | } else if (trigger_name_taken(state, trigger)) { | |
2714 | /* Not a fatal error. */ | |
2715 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2716 | ret = 0; | |
242388e4 JR |
2717 | goto error; |
2718 | } | |
0efb2ad7 JG |
2719 | } else { |
2720 | trigger_name = "(anonymous)"; | |
242388e4 JR |
2721 | } |
2722 | ||
ab0ee2ca | 2723 | condition = lttng_trigger_get_condition(trigger); |
a0377dfe | 2724 | LTTNG_ASSERT(condition); |
1da26331 | 2725 | |
959e3c66 JR |
2726 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2727 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2728 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2729 | goto error; | |
1da26331 JG |
2730 | } |
2731 | ||
7966af57 | 2732 | trigger_ht_element = (lttng_trigger_ht_element *) zmalloc(sizeof(*trigger_ht_element)); |
ab0ee2ca JG |
2733 | if (!trigger_ht_element) { |
2734 | ret = -1; | |
2735 | goto error; | |
2736 | } | |
2737 | ||
2738 | /* Add trigger to the trigger_ht. */ | |
2739 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2740 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2741 | trigger_ht_element->trigger = trigger; |
2742 | ||
2743 | node = cds_lfht_add_unique(state->triggers_ht, | |
2744 | lttng_condition_hash(condition), | |
242388e4 JR |
2745 | match_trigger, |
2746 | trigger, | |
ab0ee2ca JG |
2747 | &trigger_ht_element->node); |
2748 | if (node != &trigger_ht_element->node) { | |
2749 | /* Not a fatal error, simply report it to the client. */ | |
2750 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2751 | goto error_free_ht_element; | |
2752 | } | |
2753 | ||
242388e4 JR |
2754 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2755 | hash_trigger_by_name_uid(trigger), | |
2756 | match_trigger_by_name_uid, | |
2757 | trigger, | |
2758 | &trigger_ht_element->node_by_name_uid); | |
2759 | if (node != &trigger_ht_element->node_by_name_uid) { | |
75e540c6 JG |
2760 | /* Internal error: add to triggers_ht should have failed. */ |
2761 | ret = -1; | |
242388e4 JR |
2762 | goto error_free_ht_element; |
2763 | } | |
2764 | ||
9c374932 JR |
2765 | /* From this point consider the trigger registered. */ |
2766 | lttng_trigger_set_as_registered(trigger); | |
2767 | ||
6487ad53 FD |
2768 | /* |
2769 | * Some triggers might need a tracer notifier depending on its | |
2770 | * condition and actions. | |
2771 | */ | |
2772 | if (lttng_trigger_needs_tracer_notifier(trigger)) { | |
2773 | enum lttng_error_code error_code; | |
e7c93cf9 | 2774 | |
6487ad53 FD |
2775 | error_code = setup_tracer_notifier(state, trigger); |
2776 | if (error_code != LTTNG_OK) { | |
2758e38b FD |
2777 | notif_thread_state_remove_trigger_ht_elem(state, |
2778 | trigger_ht_element); | |
6487ad53 FD |
2779 | if (error_code == LTTNG_ERR_NOMEM) { |
2780 | ret = -1; | |
2781 | } else { | |
2782 | *cmd_result = error_code; | |
2783 | ret = 0; | |
90aa04a1 FD |
2784 | } |
2785 | ||
6487ad53 | 2786 | goto error_free_ht_element; |
90aa04a1 | 2787 | } |
e7c93cf9 JR |
2788 | } |
2789 | ||
ab0ee2ca JG |
2790 | /* |
2791 | * The rest only applies to triggers that have a "notify" action. | |
2792 | * It is not skipped as this is the only action type currently | |
2793 | * supported. | |
2794 | */ | |
f2b3ef9f | 2795 | if (is_trigger_action_notify(trigger)) { |
091fa780 FD |
2796 | /* |
2797 | * Find or create the client list of this condition. It may | |
2798 | * already be present if another trigger is already registered | |
2799 | * with the same condition. | |
2800 | */ | |
2801 | client_list = get_client_list_from_condition(state, condition); | |
f2b3ef9f | 2802 | if (!client_list) { |
091fa780 FD |
2803 | /* |
2804 | * No client list for this condition yet. We create new | |
2805 | * one and build it up. | |
2806 | */ | |
2807 | client_list = notification_client_list_create(state, condition); | |
2808 | if (!client_list) { | |
2809 | ERR("Error creating notification client list for trigger %s", trigger->name); | |
2810 | goto error_free_ht_element; | |
f2b3ef9f | 2811 | } |
ab0ee2ca | 2812 | } |
f2b3ef9f | 2813 | |
091fa780 FD |
2814 | CDS_INIT_LIST_HEAD(&trigger_ht_element->client_list_trigger_node); |
2815 | ||
2816 | pthread_mutex_lock(&client_list->lock); | |
2817 | cds_list_add(&trigger_ht_element->client_list_trigger_node, &client_list->triggers_list); | |
2818 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca JG |
2819 | } |
2820 | ||
091fa780 FD |
2821 | /* |
2822 | * Ownership of the trigger and of its wrapper was transfered to | |
2823 | * the triggers_ht. Same for token ht element if necessary. | |
2824 | */ | |
2825 | trigger_ht_element = NULL; | |
2826 | free_trigger = false; | |
2827 | ||
f82f93a1 | 2828 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2829 | case LTTNG_OBJECT_TYPE_SESSION: |
2830 | /* Add the trigger to the list if it matches a known session. */ | |
2831 | ret = bind_trigger_to_matching_session(trigger, state); | |
2832 | if (ret) { | |
091fa780 | 2833 | goto error_free_ht_element; |
ab0ee2ca | 2834 | } |
f82f93a1 | 2835 | break; |
51eab943 JG |
2836 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2837 | /* | |
2838 | * Add the trigger to list of triggers bound to the channels | |
2839 | * currently known. | |
2840 | */ | |
2841 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2842 | if (ret) { | |
091fa780 | 2843 | goto error_free_ht_element; |
ab0ee2ca | 2844 | } |
51eab943 JG |
2845 | break; |
2846 | case LTTNG_OBJECT_TYPE_NONE: | |
2847 | break; | |
2848 | default: | |
f2b3ef9f | 2849 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2850 | ret = -1; |
091fa780 | 2851 | goto error_free_ht_element; |
ab0ee2ca JG |
2852 | } |
2853 | ||
2ae99f0b | 2854 | /* |
f2b3ef9f JG |
2855 | * The new trigger's condition must be evaluated against the current |
2856 | * state. | |
2857 | * | |
2858 | * In the case of `notify` action, nothing preventing clients from | |
2859 | * subscribing to a condition before the corresponding trigger is | |
2860 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2861 | * |
2862 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2863 | * reception of a channel sample) to evaluate this new condition, but | |
2864 | * that was broken. | |
2865 | * | |
2866 | * The reason it was broken is that waiting for the next sample | |
2867 | * does not allow us to properly handle transitions for edge-triggered | |
2868 | * conditions. | |
2869 | * | |
2870 | * Consider this example: when we handle a new channel sample, we | |
2871 | * evaluate each conditions twice: once with the previous state, and | |
2872 | * again with the newest state. We then use those two results to | |
2873 | * determine whether a state change happened: a condition was false and | |
2874 | * became true. If a state change happened, we have to notify clients. | |
2875 | * | |
2876 | * Now, if a client subscribes to a given notification and registers | |
2877 | * a trigger *after* that subscription, we have to make sure the | |
2878 | * condition is evaluated at this point while considering only the | |
2879 | * current state. Otherwise, the next evaluation cycle may only see | |
2880 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2881 | * the client will never know that the condition has been met. | |
2882 | */ | |
f2b3ef9f JG |
2883 | switch (get_condition_binding_object(condition)) { |
2884 | case LTTNG_OBJECT_TYPE_SESSION: | |
2885 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2886 | &evaluation, &object_uid, |
2887 | &object_gid); | |
bc8daafb JG |
2888 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2889 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2890 | break; |
f2b3ef9f JG |
2891 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2892 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2893 | &evaluation, &object_uid, |
2894 | &object_gid); | |
bc8daafb JG |
2895 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2896 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2897 | break; |
2898 | case LTTNG_OBJECT_TYPE_NONE: | |
2899 | ret = 0; | |
242388e4 | 2900 | break; |
f2b3ef9f JG |
2901 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2902 | default: | |
2903 | ret = -1; | |
242388e4 | 2904 | break; |
f2b3ef9f JG |
2905 | } |
2906 | ||
2907 | if (ret) { | |
2908 | /* Fatal error. */ | |
091fa780 | 2909 | goto error_free_ht_element; |
f2b3ef9f JG |
2910 | } |
2911 | ||
2912 | DBG("Newly registered trigger's condition evaluated to %s", | |
2913 | evaluation ? "true" : "false"); | |
2914 | if (!evaluation) { | |
2915 | /* Evaluation yielded nothing. Normal exit. */ | |
2916 | ret = 0; | |
091fa780 | 2917 | goto success; |
2ae99f0b JG |
2918 | } |
2919 | ||
2920 | /* | |
f2b3ef9f JG |
2921 | * Ownership of `evaluation` transferred to the action executor |
2922 | * no matter the result. | |
2ae99f0b | 2923 | */ |
72365501 JR |
2924 | executor_status = action_executor_enqueue_trigger(state->executor, |
2925 | trigger, evaluation, &object_creds, client_list); | |
f2b3ef9f JG |
2926 | evaluation = NULL; |
2927 | switch (executor_status) { | |
2928 | case ACTION_EXECUTOR_STATUS_OK: | |
2929 | break; | |
2930 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2931 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2932 | /* | |
2933 | * TODO Add trigger identification (name/id) when | |
2934 | * it is added to the API. | |
2935 | */ | |
2936 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2937 | ret = -1; | |
091fa780 | 2938 | goto error_free_ht_element; |
f2b3ef9f JG |
2939 | case ACTION_EXECUTOR_STATUS_OVERFLOW: |
2940 | /* | |
2941 | * TODO Add trigger identification (name/id) when | |
2942 | * it is added to the API. | |
2943 | * | |
2944 | * Not a fatal error. | |
2945 | */ | |
2946 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2947 | ret = 0; | |
091fa780 | 2948 | goto success; |
f2b3ef9f JG |
2949 | default: |
2950 | abort(); | |
2951 | } | |
2ae99f0b | 2952 | |
091fa780 | 2953 | success: |
ab0ee2ca | 2954 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2955 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2956 | trigger_name, trigger_tracer_token); | |
091fa780 | 2957 | goto end; |
505b2d90 | 2958 | |
ab0ee2ca | 2959 | error_free_ht_element: |
242388e4 JR |
2960 | if (trigger_ht_element) { |
2961 | /* Delayed removal due to RCU constraint on delete. */ | |
2962 | call_rcu(&trigger_ht_element->rcu_node, | |
2963 | free_lttng_trigger_ht_element_rcu); | |
2964 | } | |
ab0ee2ca JG |
2965 | error: |
2966 | if (free_trigger) { | |
9c374932 JR |
2967 | /* |
2968 | * Other objects might have a reference to the trigger, mark it | |
2969 | * as unregistered. | |
2970 | */ | |
2971 | lttng_trigger_set_as_unregistered(trigger); | |
ab0ee2ca JG |
2972 | lttng_trigger_destroy(trigger); |
2973 | } | |
091fa780 | 2974 | end: |
ab0ee2ca JG |
2975 | rcu_read_unlock(); |
2976 | return ret; | |
2977 | } | |
2978 | ||
83b934ad MD |
2979 | static |
2980 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2981 | { | |
2982 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2983 | rcu_node)); | |
2984 | } | |
2985 | ||
e7c93cf9 JR |
2986 | static |
2987 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
2988 | { | |
2989 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
2990 | rcu_node)); | |
2991 | } | |
2992 | ||
6487ad53 FD |
2993 | static |
2994 | void teardown_tracer_notifier(struct notification_thread_state *state, | |
2995 | const struct lttng_trigger *trigger) | |
2996 | { | |
2997 | struct cds_lfht_iter iter; | |
2998 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element; | |
2999 | ||
3000 | cds_lfht_for_each_entry(state->trigger_tokens_ht, &iter, | |
3001 | trigger_tokens_ht_element, node) { | |
3002 | ||
3003 | if (!lttng_trigger_is_equal(trigger, | |
3004 | trigger_tokens_ht_element->trigger)) { | |
3005 | continue; | |
3006 | } | |
3007 | ||
3008 | event_notifier_error_accounting_unregister_event_notifier( | |
3009 | trigger_tokens_ht_element->trigger); | |
3010 | ||
3011 | /* TODO talk to all app and remove it */ | |
bd0514a5 | 3012 | DBG("Removed trigger from tokens_ht"); |
6487ad53 FD |
3013 | cds_lfht_del(state->trigger_tokens_ht, |
3014 | &trigger_tokens_ht_element->node); | |
3015 | ||
3016 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
3017 | free_notification_trigger_tokens_ht_element_rcu); | |
3018 | ||
3019 | break; | |
3020 | } | |
3021 | } | |
3022 | ||
cc2295b5 | 3023 | static |
ab0ee2ca JG |
3024 | int handle_notification_thread_command_unregister_trigger( |
3025 | struct notification_thread_state *state, | |
ac16173e | 3026 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
3027 | enum lttng_error_code *_cmd_reply) |
3028 | { | |
3029 | struct cds_lfht_iter iter; | |
ed327204 | 3030 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
3031 | struct lttng_channel_trigger_list *trigger_list; |
3032 | struct notification_client_list *client_list; | |
ab0ee2ca | 3033 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 3034 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 3035 | trigger); |
ab0ee2ca JG |
3036 | enum lttng_error_code cmd_reply; |
3037 | ||
3038 | rcu_read_lock(); | |
3039 | ||
3040 | cds_lfht_lookup(state->triggers_ht, | |
3041 | lttng_condition_hash(condition), | |
242388e4 JR |
3042 | match_trigger, |
3043 | trigger, | |
ab0ee2ca JG |
3044 | &iter); |
3045 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
3046 | if (!triggers_ht_node) { | |
3047 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
3048 | goto end; | |
3049 | } else { | |
3050 | cmd_reply = LTTNG_OK; | |
3051 | } | |
3052 | ||
9c374932 JR |
3053 | trigger_ht_element = caa_container_of(triggers_ht_node, |
3054 | struct lttng_trigger_ht_element, node); | |
3055 | ||
ab0ee2ca JG |
3056 | /* Remove trigger from channel_triggers_ht. */ |
3057 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
3058 | channel_triggers_ht_node) { | |
3059 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
3060 | ||
3061 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
3062 | &trigger_list->list, node) { | |
e8f7fa11 | 3063 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
3064 | continue; |
3065 | } | |
3066 | ||
bd0514a5 | 3067 | DBG("Removed trigger from channel_triggers_ht"); |
ab0ee2ca | 3068 | cds_list_del(&trigger_element->node); |
e4db5ace JR |
3069 | /* A trigger can only appear once per channel */ |
3070 | break; | |
ab0ee2ca JG |
3071 | } |
3072 | } | |
3073 | ||
6487ad53 FD |
3074 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
3075 | teardown_tracer_notifier(state, trigger); | |
e7c93cf9 JR |
3076 | } |
3077 | ||
51367634 JR |
3078 | if (is_trigger_action_notify(trigger)) { |
3079 | /* | |
3080 | * Remove and release the client list from | |
3081 | * notification_trigger_clients_ht. | |
3082 | */ | |
3083 | client_list = get_client_list_from_condition(state, condition); | |
a0377dfe | 3084 | LTTNG_ASSERT(client_list); |
ed327204 | 3085 | |
091fa780 FD |
3086 | pthread_mutex_lock(&client_list->lock); |
3087 | cds_list_del(&trigger_ht_element->client_list_trigger_node); | |
3088 | pthread_mutex_unlock(&client_list->lock); | |
3089 | ||
51367634 JR |
3090 | /* Put new reference and the hashtable's reference. */ |
3091 | notification_client_list_put(client_list); | |
3092 | notification_client_list_put(client_list); | |
3093 | client_list = NULL; | |
3094 | } | |
ab0ee2ca | 3095 | |
2758e38b FD |
3096 | /* Remove trigger from triggers_ht. */ |
3097 | notif_thread_state_remove_trigger_ht_elem(state, trigger_ht_element); | |
ab0ee2ca | 3098 | |
7ca172c1 | 3099 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 3100 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 3101 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
3102 | end: |
3103 | rcu_read_unlock(); | |
3104 | if (_cmd_reply) { | |
3105 | *_cmd_reply = cmd_reply; | |
3106 | } | |
3107 | return 0; | |
3108 | } | |
3109 | ||
3110 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
3111 | int handle_notification_thread_command( | |
3112 | struct notification_thread_handle *handle, | |
3113 | struct notification_thread_state *state) | |
3114 | { | |
3115 | int ret; | |
3116 | uint64_t counter; | |
3117 | struct notification_thread_command *cmd; | |
3118 | ||
8abe313a | 3119 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 3120 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 3121 | sizeof(counter)); |
18aeca05 | 3122 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
3123 | goto error; |
3124 | } | |
3125 | ||
3126 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
3127 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
3128 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
3129 | cds_list_del(&cmd->cmd_list_node); |
3130 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
6900ae81 | 3131 | |
bd0514a5 | 3132 | DBG("Received `%s` command", |
6900ae81 | 3133 | notification_command_type_str(cmd->type)); |
ab0ee2ca JG |
3134 | switch (cmd->type) { |
3135 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
3136 | ret = handle_notification_thread_command_register_trigger(state, |
3137 | cmd->parameters.register_trigger.trigger, | |
0efb2ad7 | 3138 | cmd->parameters.register_trigger.is_trigger_anonymous, |
ab0ee2ca JG |
3139 | &cmd->reply_code); |
3140 | break; | |
3141 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 3142 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
3143 | state, |
3144 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
3145 | &cmd->reply_code); |
3146 | break; | |
3147 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 3148 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
3149 | state, |
3150 | cmd->parameters.add_channel.session.name, | |
3151 | cmd->parameters.add_channel.session.uid, | |
3152 | cmd->parameters.add_channel.session.gid, | |
3153 | cmd->parameters.add_channel.channel.name, | |
3154 | cmd->parameters.add_channel.channel.domain, | |
3155 | cmd->parameters.add_channel.channel.key, | |
3156 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
3157 | &cmd->reply_code); |
3158 | break; | |
3159 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
3160 | ret = handle_notification_thread_command_remove_channel( |
3161 | state, cmd->parameters.remove_channel.key, | |
3162 | cmd->parameters.remove_channel.domain, | |
3163 | &cmd->reply_code); | |
3164 | break; | |
0ca52944 | 3165 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 3166 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 3167 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 3168 | state, |
ed327204 JG |
3169 | cmd->type, |
3170 | cmd->parameters.session_rotation.session_name, | |
3171 | cmd->parameters.session_rotation.uid, | |
3172 | cmd->parameters.session_rotation.gid, | |
3173 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
3174 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
3175 | &cmd->reply_code); |
3176 | break; | |
d02d7404 JR |
3177 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
3178 | ret = handle_notification_thread_command_add_tracer_event_source( | |
3179 | state, | |
3180 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3181 | cmd->parameters.tracer_event_source.domain, | |
3182 | &cmd->reply_code); | |
3183 | break; | |
3184 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
3185 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
3186 | state, | |
3187 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3188 | &cmd->reply_code); | |
3189 | break; | |
fbc9f37d JR |
3190 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
3191 | { | |
3192 | struct lttng_triggers *triggers = NULL; | |
3193 | ||
3194 | ret = handle_notification_thread_command_list_triggers( | |
3195 | handle, | |
3196 | state, | |
3197 | cmd->parameters.list_triggers.uid, | |
3198 | &triggers, | |
3199 | &cmd->reply_code); | |
3200 | cmd->reply.list_triggers.triggers = triggers; | |
3201 | ret = 0; | |
3202 | break; | |
3203 | } | |
ab0ee2ca | 3204 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
3205 | cmd->reply_code = LTTNG_OK; |
3206 | ret = 1; | |
3207 | goto end; | |
8790759c FD |
3208 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
3209 | { | |
3210 | struct lttng_trigger *trigger = NULL; | |
3211 | ||
3212 | ret = handle_notification_thread_command_get_trigger(state, | |
3213 | cmd->parameters.get_trigger.trigger, &trigger, | |
3214 | &cmd->reply_code); | |
3215 | cmd->reply.get_trigger.trigger = trigger; | |
3216 | break; | |
3217 | } | |
f2b3ef9f JG |
3218 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
3219 | { | |
3220 | const enum client_transmission_status client_status = | |
3221 | cmd->parameters.client_communication_update | |
3222 | .status; | |
3223 | const notification_client_id client_id = | |
3224 | cmd->parameters.client_communication_update.id; | |
3225 | struct notification_client *client; | |
3226 | ||
3227 | rcu_read_lock(); | |
3228 | client = get_client_from_id(client_id, state); | |
3229 | ||
3230 | if (!client) { | |
3231 | /* | |
3232 | * Client error was probably already picked-up by the | |
3233 | * notification thread or it has disconnected | |
3234 | * gracefully while this command was queued. | |
3235 | */ | |
3236 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
3237 | client_id); | |
3238 | ret = 0; | |
3239 | } else { | |
f2b3ef9f JG |
3240 | ret = client_handle_transmission_status( |
3241 | client, client_status, state); | |
f2b3ef9f JG |
3242 | } |
3243 | rcu_read_unlock(); | |
3244 | break; | |
3245 | } | |
ab0ee2ca | 3246 | default: |
bd0514a5 | 3247 | ERR("Unknown internal command received"); |
ab0ee2ca JG |
3248 | goto error_unlock; |
3249 | } | |
3250 | ||
3251 | if (ret) { | |
3252 | goto error_unlock; | |
3253 | } | |
3254 | end: | |
0ab399e0 JG |
3255 | if (cmd->is_async) { |
3256 | free(cmd); | |
3257 | cmd = NULL; | |
3258 | } else { | |
3259 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3260 | } | |
ab0ee2ca JG |
3261 | return ret; |
3262 | error_unlock: | |
3263 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3264 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3265 | cmd->reply_code = LTTNG_ERR_FATAL; |
3266 | error: | |
3267 | /* Indicate a fatal error to the caller. */ | |
3268 | return -1; | |
3269 | } | |
3270 | ||
ab0ee2ca JG |
3271 | static |
3272 | int socket_set_non_blocking(int socket) | |
3273 | { | |
3274 | int ret, flags; | |
3275 | ||
3276 | /* Set the pipe as non-blocking. */ | |
3277 | ret = fcntl(socket, F_GETFL, 0); | |
3278 | if (ret == -1) { | |
3279 | PERROR("fcntl get socket flags"); | |
3280 | goto end; | |
3281 | } | |
3282 | flags = ret; | |
3283 | ||
3284 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3285 | if (ret == -1) { | |
3286 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3287 | goto end; | |
3288 | } | |
3289 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3290 | end: | |
3291 | return ret; | |
3292 | } | |
3293 | ||
3294 | static | |
14fa22f8 | 3295 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3296 | { |
3297 | int ret; | |
3298 | ||
882093ee JR |
3299 | |
3300 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3301 | |
3302 | client->communication.inbound.bytes_to_receive = | |
3303 | sizeof(struct lttng_notification_channel_message); | |
3304 | client->communication.inbound.msg_type = | |
3305 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3306 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3307 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3308 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3309 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3310 | client->communication.inbound.bytes_to_receive); |
882093ee | 3311 | |
14fa22f8 | 3312 | return ret; |
ab0ee2ca JG |
3313 | } |
3314 | ||
3315 | int handle_notification_thread_client_connect( | |
3316 | struct notification_thread_state *state) | |
3317 | { | |
3318 | int ret; | |
3319 | struct notification_client *client; | |
3320 | ||
bd0514a5 | 3321 | DBG("Handling new notification channel client connection"); |
ab0ee2ca | 3322 | |
7966af57 | 3323 | client = (notification_client *) zmalloc(sizeof(*client)); |
ab0ee2ca JG |
3324 | if (!client) { |
3325 | /* Fatal error. */ | |
3326 | ret = -1; | |
3327 | goto error; | |
3328 | } | |
6c24d3fd | 3329 | |
505b2d90 | 3330 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3331 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3332 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3333 | lttng_payload_init(&client->communication.inbound.payload); |
3334 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3335 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3336 | |
14fa22f8 JG |
3337 | ret = client_reset_inbound_state(client); |
3338 | if (ret) { | |
bd0514a5 | 3339 | ERR("Failed to reset client communication's inbound state"); |
e742b055 | 3340 | ret = 0; |
14fa22f8 JG |
3341 | goto error; |
3342 | } | |
ab0ee2ca JG |
3343 | |
3344 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3345 | if (ret < 0) { | |
bd0514a5 | 3346 | ERR("Failed to accept new notification channel client connection"); |
ab0ee2ca JG |
3347 | ret = 0; |
3348 | goto error; | |
3349 | } | |
3350 | ||
3351 | client->socket = ret; | |
3352 | ||
3353 | ret = socket_set_non_blocking(client->socket); | |
3354 | if (ret) { | |
bd0514a5 | 3355 | ERR("Failed to set new notification channel client connection socket as non-blocking"); |
ab0ee2ca JG |
3356 | goto error; |
3357 | } | |
3358 | ||
3359 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3360 | if (ret < 0) { | |
bd0514a5 | 3361 | ERR("Failed to set socket options on new notification channel client socket"); |
ab0ee2ca JG |
3362 | ret = 0; |
3363 | goto error; | |
3364 | } | |
3365 | ||
3366 | ret = lttng_poll_add(&state->events, client->socket, | |
3367 | LPOLLIN | LPOLLERR | | |
3368 | LPOLLHUP | LPOLLRDHUP); | |
3369 | if (ret < 0) { | |
bd0514a5 | 3370 | ERR("Failed to add notification channel client socket to poll set"); |
ab0ee2ca JG |
3371 | ret = 0; |
3372 | goto error; | |
3373 | } | |
bd0514a5 | 3374 | DBG("Added new notification channel client socket (%i) to poll set", |
ab0ee2ca JG |
3375 | client->socket); |
3376 | ||
ab0ee2ca JG |
3377 | rcu_read_lock(); |
3378 | cds_lfht_add(state->client_socket_ht, | |
3379 | hash_client_socket(client->socket), | |
3380 | &client->client_socket_ht_node); | |
ac1889bf JG |
3381 | cds_lfht_add(state->client_id_ht, |
3382 | hash_client_id(client->id), | |
3383 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3384 | rcu_read_unlock(); |
3385 | ||
3386 | return ret; | |
6c24d3fd | 3387 | |
ab0ee2ca JG |
3388 | error: |
3389 | notification_client_destroy(client, state); | |
3390 | return ret; | |
3391 | } | |
3392 | ||
6c24d3fd JG |
3393 | /* |
3394 | * RCU read-lock must be held by the caller. | |
3395 | * Client lock must _not_ be held by the caller. | |
3396 | */ | |
505b2d90 JG |
3397 | static |
3398 | int notification_thread_client_disconnect( | |
3399 | struct notification_client *client, | |
ab0ee2ca | 3400 | struct notification_thread_state *state) |
505b2d90 JG |
3401 | { |
3402 | int ret; | |
3403 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3404 | ||
3405 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 3406 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3407 | client->communication.active = false; |
6c24d3fd JG |
3408 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3409 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3410 | pthread_mutex_unlock(&client->lock); | |
3411 | ||
505b2d90 JG |
3412 | ret = lttng_poll_del(&state->events, client->socket); |
3413 | if (ret) { | |
bd0514a5 | 3414 | ERR("Failed to remove client socket %d from poll set", |
505b2d90 JG |
3415 | client->socket); |
3416 | } | |
3417 | ||
505b2d90 JG |
3418 | /* Release all conditions to which the client was subscribed. */ |
3419 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3420 | &client->condition_list, node) { | |
3421 | (void) notification_thread_client_unsubscribe(client, | |
3422 | condition_list_element->condition, state, NULL); | |
3423 | } | |
3424 | ||
3425 | /* | |
3426 | * Client no longer accessible to other threads (through the | |
3427 | * client lists). | |
3428 | */ | |
3429 | notification_client_destroy(client, state); | |
3430 | return ret; | |
3431 | } | |
3432 | ||
3433 | int handle_notification_thread_client_disconnect( | |
3434 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3435 | { |
3436 | int ret = 0; | |
3437 | struct notification_client *client; | |
3438 | ||
3439 | rcu_read_lock(); | |
bd0514a5 | 3440 | DBG("Closing client connection (socket fd = %i)", |
ab0ee2ca JG |
3441 | client_socket); |
3442 | client = get_client_from_socket(client_socket, state); | |
3443 | if (!client) { | |
3444 | /* Internal state corruption, fatal error. */ | |
bd0514a5 | 3445 | ERR("Unable to find client (socket fd = %i)", |
ab0ee2ca JG |
3446 | client_socket); |
3447 | ret = -1; | |
3448 | goto end; | |
3449 | } | |
3450 | ||
505b2d90 | 3451 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3452 | end: |
3453 | rcu_read_unlock(); | |
3454 | return ret; | |
3455 | } | |
3456 | ||
3457 | int handle_notification_thread_client_disconnect_all( | |
3458 | struct notification_thread_state *state) | |
3459 | { | |
3460 | struct cds_lfht_iter iter; | |
3461 | struct notification_client *client; | |
3462 | bool error_encoutered = false; | |
3463 | ||
3464 | rcu_read_lock(); | |
bd0514a5 | 3465 | DBG("Closing all client connections"); |
ab0ee2ca | 3466 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, |
505b2d90 | 3467 | client_socket_ht_node) { |
ab0ee2ca JG |
3468 | int ret; |
3469 | ||
505b2d90 JG |
3470 | ret = notification_thread_client_disconnect( |
3471 | client, state); | |
ab0ee2ca JG |
3472 | if (ret) { |
3473 | error_encoutered = true; | |
3474 | } | |
3475 | } | |
3476 | rcu_read_unlock(); | |
3477 | return error_encoutered ? 1 : 0; | |
3478 | } | |
3479 | ||
3480 | int handle_notification_thread_trigger_unregister_all( | |
3481 | struct notification_thread_state *state) | |
3482 | { | |
4149ace8 | 3483 | bool error_occurred = false; |
ab0ee2ca JG |
3484 | struct cds_lfht_iter iter; |
3485 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3486 | ||
763de384 | 3487 | rcu_read_lock(); |
ab0ee2ca JG |
3488 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3489 | node) { | |
3490 | int ret = handle_notification_thread_command_unregister_trigger( | |
3491 | state, trigger_ht_element->trigger, NULL); | |
3492 | if (ret) { | |
4149ace8 | 3493 | error_occurred = true; |
ab0ee2ca JG |
3494 | } |
3495 | } | |
763de384 | 3496 | rcu_read_unlock(); |
4149ace8 | 3497 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3498 | } |
3499 | ||
dd877ea6 JG |
3500 | static |
3501 | int client_handle_transmission_status( | |
3502 | struct notification_client *client, | |
3503 | enum client_transmission_status transmission_status, | |
3504 | struct notification_thread_state *state) | |
3505 | { | |
3506 | int ret = 0; | |
3507 | ||
3508 | switch (transmission_status) { | |
3509 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3510 | ret = lttng_poll_mod(&state->events, client->socket, | |
3511 | CLIENT_POLL_MASK_IN); | |
3512 | if (ret) { | |
3513 | goto end; | |
3514 | } | |
3515 | ||
dd877ea6 JG |
3516 | break; |
3517 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3518 | /* | |
3519 | * We want to be notified whenever there is buffer space | |
3520 | * available to send the rest of the payload. | |
3521 | */ | |
3522 | ret = lttng_poll_mod(&state->events, client->socket, | |
3523 | CLIENT_POLL_MASK_IN_OUT); | |
3524 | if (ret) { | |
3525 | goto end; | |
3526 | } | |
3527 | break; | |
3528 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3529 | ret = notification_thread_client_disconnect(client, state); | |
3530 | if (ret) { | |
3531 | goto end; | |
3532 | } | |
3533 | break; | |
3534 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3535 | ret = -1; | |
3536 | goto end; | |
3537 | default: | |
3538 | abort(); | |
3539 | } | |
3540 | end: | |
3541 | return ret; | |
3542 | } | |
3543 | ||
505b2d90 | 3544 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3545 | static |
dd877ea6 | 3546 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3547 | struct notification_client *client) |
ab0ee2ca JG |
3548 | { |
3549 | ssize_t ret; | |
3550 | size_t to_send_count; | |
dd877ea6 | 3551 | enum client_transmission_status status; |
882093ee JR |
3552 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3553 | &client->communication.outbound.payload, 0, -1); | |
3554 | const int fds_to_send_count = | |
3555 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3556 | |
505b2d90 JG |
3557 | ASSERT_LOCKED(client->lock); |
3558 | ||
f2b3ef9f JG |
3559 | if (!client->communication.active) { |
3560 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3561 | goto end; | |
3562 | } | |
3563 | ||
882093ee JR |
3564 | if (pv.buffer.size == 0) { |
3565 | /* | |
3566 | * If both data and fds are equal to zero, we are in an invalid | |
3567 | * state. | |
3568 | */ | |
a0377dfe | 3569 | LTTNG_ASSERT(fds_to_send_count != 0); |
882093ee JR |
3570 | goto send_fds; |
3571 | } | |
3572 | ||
3573 | /* Send data. */ | |
3574 | to_send_count = pv.buffer.size; | |
bd0514a5 | 3575 | DBG("Flushing client (socket fd = %i) outgoing queue", |
ab0ee2ca JG |
3576 | client->socket); |
3577 | ||
3578 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3579 | pv.buffer.data, |
ab0ee2ca | 3580 | to_send_count); |
44c180ca | 3581 | if ((ret >= 0 && ret < to_send_count)) { |
bd0514a5 | 3582 | DBG("Client (socket fd = %i) outgoing queue could not be completely flushed", |
ab0ee2ca | 3583 | client->socket); |
7966af57 | 3584 | to_send_count -= std::max(ret, (ssize_t) 0); |
ab0ee2ca | 3585 | |
6f110534 | 3586 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3587 | pv.buffer.data + |
3588 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3589 | to_send_count); |
3590 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3591 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3592 | to_send_count); |
3593 | if (ret) { | |
3594 | goto error; | |
3595 | } | |
6c24d3fd | 3596 | |
dd877ea6 | 3597 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3598 | goto end; |
ab0ee2ca | 3599 | } else if (ret < 0) { |
6c24d3fd | 3600 | /* Generic error, disable the client's communication. */ |
bd0514a5 | 3601 | ERR("Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3602 | client->socket); |
6c24d3fd | 3603 | client->communication.active = false; |
dd877ea6 | 3604 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3605 | goto end; |
ab0ee2ca | 3606 | } else { |
882093ee JR |
3607 | /* |
3608 | * No error and flushed the queue completely. | |
3609 | * | |
3610 | * The payload buffer size is used later to | |
3611 | * check if there is notifications queued. So albeit that the | |
3612 | * direct caller knows that the transmission is complete, we | |
3613 | * need to set the buffer size to zero. | |
3614 | */ | |
ab0ee2ca | 3615 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3616 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3617 | if (ret) { |
3618 | goto error; | |
3619 | } | |
882093ee | 3620 | } |
6c24d3fd | 3621 | |
882093ee JR |
3622 | send_fds: |
3623 | /* No fds to send, transmission is complete. */ | |
3624 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3625 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3626 | goto end; |
dd877ea6 | 3627 | } |
882093ee JR |
3628 | |
3629 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3630 | client->socket, &pv); | |
3631 | if (ret < 0) { | |
3632 | /* Generic error, disable the client's communication. */ | |
bd0514a5 | 3633 | ERR("Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", |
882093ee JR |
3634 | client->socket); |
3635 | client->communication.active = false; | |
3636 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3637 | goto end; | |
3638 | } else if (ret == 0) { | |
3639 | /* Nothing could be sent. */ | |
3640 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3641 | } else { | |
3642 | /* Fd passing is an all or nothing kind of thing. */ | |
3643 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3644 | /* | |
3645 | * The payload _fd_array count is used later to | |
3646 | * check if there is notifications queued. So although the | |
3647 | * direct caller knows that the transmission is complete, we | |
3648 | * need to clear the _fd_array for the queuing check. | |
3649 | */ | |
3650 | lttng_dynamic_pointer_array_clear( | |
3651 | &client->communication.outbound.payload | |
3652 | ._fd_handles); | |
3653 | } | |
3654 | ||
f2b3ef9f | 3655 | end: |
882093ee JR |
3656 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3657 | client->communication.outbound.queued_command_reply = false; | |
3658 | client->communication.outbound.dropped_notification = false; | |
3659 | lttng_payload_clear(&client->communication.outbound.payload); | |
3660 | } | |
3661 | ||
f2b3ef9f | 3662 | return status; |
ab0ee2ca | 3663 | error: |
f2b3ef9f | 3664 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3665 | } |
3666 | ||
882093ee JR |
3667 | static |
3668 | bool client_has_outbound_data_left( | |
3669 | const struct notification_client *client) | |
3670 | { | |
3671 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3672 | &client->communication.outbound.payload, 0, -1); | |
3673 | const bool has_data = pv.buffer.size != 0; | |
3674 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3675 | ||
3676 | return has_data || has_fds; | |
3677 | } | |
3678 | ||
6c24d3fd | 3679 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3680 | static |
3681 | int client_send_command_reply(struct notification_client *client, | |
3682 | struct notification_thread_state *state, | |
3683 | enum lttng_notification_channel_status status) | |
3684 | { | |
3685 | int ret; | |
3686 | struct lttng_notification_channel_command_reply reply = { | |
3687 | .status = (int8_t) status, | |
3688 | }; | |
3689 | struct lttng_notification_channel_message msg = { | |
3690 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3691 | .size = sizeof(reply), | |
3692 | }; | |
3693 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 3694 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3695 | |
6c24d3fd JG |
3696 | memcpy(buffer, &msg, sizeof(msg)); |
3697 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
bd0514a5 | 3698 | DBG("Send command reply (%i)", (int) status); |
505b2d90 | 3699 | |
6c24d3fd | 3700 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3701 | if (client->communication.outbound.queued_command_reply) { |
3702 | /* Protocol error. */ | |
6c24d3fd | 3703 | goto error_unlock; |
ab0ee2ca JG |
3704 | } |
3705 | ||
ab0ee2ca JG |
3706 | /* Enqueue buffer to outgoing queue and flush it. */ |
3707 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3708 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3709 | buffer, sizeof(buffer)); |
3710 | if (ret) { | |
6c24d3fd | 3711 | goto error_unlock; |
ab0ee2ca JG |
3712 | } |
3713 | ||
f2b3ef9f | 3714 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3715 | |
3716 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3717 | /* Queue could not be emptied. */ |
3718 | client->communication.outbound.queued_command_reply = true; | |
3719 | } | |
3720 | ||
3721 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3722 | ret = client_handle_transmission_status( |
3723 | client, transmission_status, state); | |
ab0ee2ca JG |
3724 | if (ret) { |
3725 | goto error; | |
3726 | } | |
3727 | ||
ab0ee2ca | 3728 | return 0; |
6c24d3fd JG |
3729 | error_unlock: |
3730 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3731 | error: |
3732 | return -1; | |
3733 | } | |
3734 | ||
505b2d90 JG |
3735 | static |
3736 | int client_handle_message_unknown(struct notification_client *client, | |
3737 | struct notification_thread_state *state) | |
3738 | { | |
3739 | int ret; | |
505b2d90 JG |
3740 | /* |
3741 | * Receiving message header. The function will be called again | |
3742 | * once the rest of the message as been received and can be | |
3743 | * interpreted. | |
3744 | */ | |
3745 | const struct lttng_notification_channel_message *msg; | |
3746 | ||
a0377dfe | 3747 | LTTNG_ASSERT(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3748 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3749 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3750 | |
3751 | if (msg->size == 0 || | |
3752 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
bd0514a5 | 3753 | ERR("Invalid notification channel message: length = %u", |
505b2d90 JG |
3754 | msg->size); |
3755 | ret = -1; | |
3756 | goto end; | |
3757 | } | |
3758 | ||
3759 | switch (msg->type) { | |
3760 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3761 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3762 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3763 | break; | |
3764 | default: | |
3765 | ret = -1; | |
bd0514a5 | 3766 | ERR("Invalid notification channel message: unexpected message type"); |
505b2d90 JG |
3767 | goto end; |
3768 | } | |
3769 | ||
3770 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3771 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3772 | client->communication.inbound.msg_type = |
3773 | (enum lttng_notification_channel_message_type) msg->type; | |
3774 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3775 | &client->communication.inbound.payload.buffer, msg->size); |
3776 | ||
3777 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3778 | msg = NULL; | |
505b2d90 | 3779 | end: |
505b2d90 JG |
3780 | return ret; |
3781 | } | |
3782 | ||
3783 | static | |
3784 | int client_handle_message_handshake(struct notification_client *client, | |
3785 | struct notification_thread_state *state) | |
3786 | { | |
3787 | int ret; | |
3788 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3789 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3790 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3791 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3792 | }; | |
3793 | const struct lttng_notification_channel_message msg_header = { | |
3794 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3795 | .size = sizeof(handshake_reply), | |
3796 | }; | |
3797 | enum lttng_notification_channel_status status = | |
3798 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3799 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3800 | |
3801 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3802 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3803 | sizeof(handshake_reply)); | |
3804 | ||
3805 | handshake_client = | |
3806 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3807 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3808 | .data; |
3809 | client->major = handshake_client->major; | |
3810 | client->minor = handshake_client->minor; | |
3811 | if (!client->communication.inbound.creds_received) { | |
bd0514a5 | 3812 | ERR("No credentials received from client"); |
505b2d90 JG |
3813 | ret = -1; |
3814 | goto end; | |
3815 | } | |
3816 | ||
3817 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3818 | &client->communication.inbound.creds); | |
3819 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3820 | &client->communication.inbound.creds); | |
f2bda80e JG |
3821 | client->is_sessiond = LTTNG_SOCK_GET_PID_CRED(&client->communication.inbound.creds) == getpid(); |
3822 | DBG("Received handshake from client: uid = %u, gid = %u, protocol version = %i.%i, client is sessiond = %s", | |
505b2d90 | 3823 | client->uid, client->gid, (int) client->major, |
f2bda80e JG |
3824 | (int) client->minor, |
3825 | client->is_sessiond ? "true" : "false"); | |
505b2d90 JG |
3826 | |
3827 | if (handshake_client->major != | |
3828 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3829 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3830 | } | |
3831 | ||
6c24d3fd JG |
3832 | pthread_mutex_lock(&client->lock); |
3833 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3834 | ret = lttng_dynamic_buffer_append( |
882093ee | 3835 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3836 | sizeof(send_buffer)); |
3837 | if (ret) { | |
bd0514a5 | 3838 | ERR("Failed to send protocol version to notification channel client"); |
6c24d3fd | 3839 | goto end_unlock; |
505b2d90 JG |
3840 | } |
3841 | ||
3842 | client->validated = true; | |
3843 | client->communication.active = true; | |
6c24d3fd | 3844 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3845 | |
6c24d3fd JG |
3846 | /* Set reception state to receive the next message header. */ |
3847 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3848 | if (ret) { |
bd0514a5 | 3849 | ERR("Failed to reset client communication's inbound state"); |
505b2d90 JG |
3850 | goto end; |
3851 | } | |
3852 | ||
6c24d3fd | 3853 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3854 | ret = client_send_command_reply(client, state, status); |
3855 | if (ret) { | |
bd0514a5 | 3856 | ERR("Failed to send reply to notification channel client"); |
505b2d90 JG |
3857 | goto end; |
3858 | } | |
3859 | ||
6c24d3fd JG |
3860 | goto end; |
3861 | end_unlock: | |
505b2d90 | 3862 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3863 | end: |
505b2d90 JG |
3864 | return ret; |
3865 | } | |
3866 | ||
3867 | static | |
3868 | int client_handle_message_subscription( | |
3869 | struct notification_client *client, | |
3870 | enum lttng_notification_channel_message_type msg_type, | |
3871 | struct notification_thread_state *state) | |
3872 | { | |
3873 | int ret; | |
3874 | struct lttng_condition *condition; | |
3875 | enum lttng_notification_channel_status status = | |
3876 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3877 | struct lttng_payload_view condition_view = | |
882093ee JR |
3878 | lttng_payload_view_from_payload( |
3879 | &client->communication.inbound.payload, | |
505b2d90 JG |
3880 | 0, -1); |
3881 | size_t expected_condition_size; | |
3882 | ||
6c24d3fd JG |
3883 | /* |
3884 | * No need to lock client to sample the inbound state as the only | |
3885 | * other thread accessing clients (action executor) only uses the | |
3886 | * outbound state. | |
3887 | */ | |
882093ee | 3888 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3889 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3890 | if (ret != expected_condition_size) { | |
bd0514a5 | 3891 | ERR("Malformed condition received from client"); |
505b2d90 JG |
3892 | goto end; |
3893 | } | |
3894 | ||
5a6306f7 | 3895 | /* Ownership of condition is always transferred. */ |
505b2d90 JG |
3896 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { |
3897 | ret = notification_thread_client_subscribe( | |
3898 | client, condition, state, &status); | |
3899 | } else { | |
3900 | ret = notification_thread_client_unsubscribe( | |
3901 | client, condition, state, &status); | |
3902 | } | |
505b2d90 | 3903 | |
505b2d90 | 3904 | if (ret) { |
6c24d3fd | 3905 | goto end; |
505b2d90 JG |
3906 | } |
3907 | ||
3908 | /* Set reception state to receive the next message header. */ | |
3909 | ret = client_reset_inbound_state(client); | |
3910 | if (ret) { | |
bd0514a5 | 3911 | ERR("Failed to reset client communication's inbound state"); |
6c24d3fd JG |
3912 | goto end; |
3913 | } | |
3914 | ||
3915 | ret = client_send_command_reply(client, state, status); | |
3916 | if (ret) { | |
bd0514a5 | 3917 | ERR("Failed to send reply to notification channel client"); |
6c24d3fd | 3918 | goto end; |
505b2d90 JG |
3919 | } |
3920 | ||
505b2d90 JG |
3921 | end: |
3922 | return ret; | |
3923 | } | |
3924 | ||
ab0ee2ca JG |
3925 | static |
3926 | int client_dispatch_message(struct notification_client *client, | |
3927 | struct notification_thread_state *state) | |
3928 | { | |
3929 | int ret = 0; | |
3930 | ||
3931 | if (client->communication.inbound.msg_type != | |
3932 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3933 | client->communication.inbound.msg_type != | |
3934 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3935 | !client->validated) { | |
bd0514a5 | 3936 | WARN("client attempted a command before handshake"); |
ab0ee2ca JG |
3937 | ret = -1; |
3938 | goto end; | |
3939 | } | |
3940 | ||
3941 | switch (client->communication.inbound.msg_type) { | |
3942 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3943 | { | |
505b2d90 | 3944 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3945 | break; |
3946 | } | |
3947 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3948 | { | |
505b2d90 | 3949 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3950 | break; |
3951 | } | |
3952 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3953 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3954 | { | |
505b2d90 JG |
3955 | ret = client_handle_message_subscription(client, |
3956 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3957 | break; |
3958 | } | |
3959 | default: | |
3960 | abort(); | |
3961 | } | |
3962 | end: | |
3963 | return ret; | |
3964 | } | |
3965 | ||
3966 | /* Incoming data from client. */ | |
3967 | int handle_notification_thread_client_in( | |
3968 | struct notification_thread_state *state, int socket) | |
3969 | { | |
14fa22f8 | 3970 | int ret = 0; |
ab0ee2ca JG |
3971 | struct notification_client *client; |
3972 | ssize_t recv_ret; | |
3973 | size_t offset; | |
3974 | ||
98b5ff34 | 3975 | rcu_read_lock(); |
ab0ee2ca JG |
3976 | client = get_client_from_socket(socket, state); |
3977 | if (!client) { | |
3978 | /* Internal error, abort. */ | |
3979 | ret = -1; | |
3980 | goto end; | |
3981 | } | |
3982 | ||
982583bd JR |
3983 | if (client->communication.inbound.bytes_to_receive == 0 && |
3984 | client->communication.inbound.fds_to_receive != 0) { | |
3985 | /* Only FDs left to receive. */ | |
3986 | goto receive_fds; | |
3987 | } | |
3988 | ||
882093ee | 3989 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3990 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3991 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3992 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3993 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3994 | client->communication.inbound.bytes_to_receive, |
3995 | &client->communication.inbound.creds); | |
3996 | if (recv_ret > 0) { | |
01ea340e | 3997 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3998 | client->communication.inbound.creds_received = true; |
3999 | } | |
4000 | } else { | |
4001 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 4002 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
4003 | client->communication.inbound.bytes_to_receive); |
4004 | } | |
505b2d90 JG |
4005 | if (recv_ret >= 0) { |
4006 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
4007 | } else { |
4008 | goto error_disconnect_client; | |
505b2d90 | 4009 | } |
6c24d3fd | 4010 | |
882093ee JR |
4011 | if (client->communication.inbound.bytes_to_receive != 0) { |
4012 | /* Message incomplete wait for more data. */ | |
4013 | ret = 0; | |
4014 | goto end; | |
ab0ee2ca JG |
4015 | } |
4016 | ||
982583bd | 4017 | receive_fds: |
a0377dfe | 4018 | LTTNG_ASSERT(client->communication.inbound.bytes_to_receive == 0); |
882093ee JR |
4019 | |
4020 | /* Receive fds. */ | |
4021 | if (client->communication.inbound.fds_to_receive != 0) { | |
4022 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
4023 | client->socket, | |
4024 | client->communication.inbound.fds_to_receive, | |
4025 | &client->communication.inbound.payload); | |
4026 | if (ret > 0) { | |
ab0ee2ca | 4027 | /* |
882093ee JR |
4028 | * Fds received. non blocking fds passing is all |
4029 | * or nothing. | |
ab0ee2ca | 4030 | */ |
882093ee JR |
4031 | ssize_t expected_size; |
4032 | ||
4033 | expected_size = sizeof(int) * | |
4034 | client->communication.inbound | |
4035 | .fds_to_receive; | |
a0377dfe | 4036 | LTTNG_ASSERT(ret == expected_size); |
882093ee JR |
4037 | client->communication.inbound.fds_to_receive = 0; |
4038 | } else if (ret == 0) { | |
4039 | /* Received nothing. */ | |
4040 | ret = 0; | |
4041 | goto end; | |
4042 | } else { | |
ab0ee2ca JG |
4043 | goto error_disconnect_client; |
4044 | } | |
ab0ee2ca | 4045 | } |
882093ee JR |
4046 | |
4047 | /* At this point the message is complete.*/ | |
a0377dfe | 4048 | LTTNG_ASSERT(client->communication.inbound.bytes_to_receive == 0 && |
882093ee JR |
4049 | client->communication.inbound.fds_to_receive == 0); |
4050 | ret = client_dispatch_message(client, state); | |
4051 | if (ret) { | |
4052 | /* | |
4053 | * Only returns an error if this client must be | |
4054 | * disconnected. | |
4055 | */ | |
4056 | goto error_disconnect_client; | |
4057 | } | |
4058 | ||
ab0ee2ca | 4059 | end: |
98b5ff34 | 4060 | rcu_read_unlock(); |
ab0ee2ca | 4061 | return ret; |
882093ee | 4062 | |
ab0ee2ca | 4063 | error_disconnect_client: |
505b2d90 | 4064 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 4065 | goto end; |
ab0ee2ca JG |
4066 | } |
4067 | ||
4068 | /* Client ready to receive outgoing data. */ | |
4069 | int handle_notification_thread_client_out( | |
4070 | struct notification_thread_state *state, int socket) | |
4071 | { | |
4072 | int ret; | |
4073 | struct notification_client *client; | |
f2b3ef9f | 4074 | enum client_transmission_status transmission_status; |
ab0ee2ca | 4075 | |
98b5ff34 | 4076 | rcu_read_lock(); |
ab0ee2ca JG |
4077 | client = get_client_from_socket(socket, state); |
4078 | if (!client) { | |
4079 | /* Internal error, abort. */ | |
4080 | ret = -1; | |
4081 | goto end; | |
4082 | } | |
4083 | ||
505b2d90 | 4084 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 4085 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
4086 | pthread_mutex_unlock(&client->lock); |
4087 | ||
f2b3ef9f JG |
4088 | ret = client_handle_transmission_status( |
4089 | client, transmission_status, state); | |
ab0ee2ca JG |
4090 | if (ret) { |
4091 | goto end; | |
4092 | } | |
4093 | end: | |
98b5ff34 | 4094 | rcu_read_unlock(); |
ab0ee2ca JG |
4095 | return ret; |
4096 | } | |
4097 | ||
4098 | static | |
e8360425 JD |
4099 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
4100 | const struct channel_state_sample *sample, | |
4101 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
4102 | { |
4103 | bool result = false; | |
4104 | uint64_t threshold; | |
4105 | enum lttng_condition_type condition_type; | |
e8360425 | 4106 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
4107 | condition, struct lttng_condition_buffer_usage, |
4108 | parent); | |
4109 | ||
ab0ee2ca JG |
4110 | if (use_condition->threshold_bytes.set) { |
4111 | threshold = use_condition->threshold_bytes.value; | |
4112 | } else { | |
4113 | /* | |
4114 | * Threshold was expressed as a ratio. | |
4115 | * | |
4116 | * TODO the threshold (in bytes) of conditions expressed | |
4117 | * as a ratio of total buffer size could be cached to | |
4118 | * forego this double-multiplication or it could be performed | |
4119 | * as fixed-point math. | |
4120 | * | |
d49487dc | 4121 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
4122 | * condition applies to multiple channels (i.e. don't assume |
4123 | * that all channels matching my_chann* have the same size...) | |
4124 | */ | |
4125 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
4126 | (double) buffer_capacity); | |
4127 | } | |
4128 | ||
4129 | condition_type = lttng_condition_get_type(condition); | |
4130 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
bd0514a5 | 4131 | DBG("Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4132 | threshold, sample->highest_usage); |
4133 | ||
4134 | /* | |
4135 | * The low condition should only be triggered once _all_ of the | |
4136 | * streams in a channel have gone below the "low" threshold. | |
4137 | */ | |
4138 | if (sample->highest_usage <= threshold) { | |
4139 | result = true; | |
4140 | } | |
4141 | } else { | |
bd0514a5 | 4142 | DBG("High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4143 | threshold, sample->highest_usage); |
4144 | ||
4145 | /* | |
4146 | * For high buffer usage scenarios, we want to trigger whenever | |
4147 | * _any_ of the streams has reached the "high" threshold. | |
4148 | */ | |
4149 | if (sample->highest_usage >= threshold) { | |
4150 | result = true; | |
4151 | } | |
4152 | } | |
e8360425 | 4153 | |
ab0ee2ca JG |
4154 | return result; |
4155 | } | |
4156 | ||
4157 | static | |
e8360425 JD |
4158 | bool evaluate_session_consumed_size_condition( |
4159 | const struct lttng_condition *condition, | |
4160 | uint64_t session_consumed_size) | |
4161 | { | |
4162 | uint64_t threshold; | |
4163 | const struct lttng_condition_session_consumed_size *size_condition = | |
4164 | container_of(condition, | |
4165 | struct lttng_condition_session_consumed_size, | |
4166 | parent); | |
4167 | ||
4168 | threshold = size_condition->consumed_threshold_bytes.value; | |
bd0514a5 | 4169 | DBG("Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, |
e8360425 JD |
4170 | threshold, session_consumed_size); |
4171 | return session_consumed_size >= threshold; | |
4172 | } | |
4173 | ||
4174 | static | |
ed327204 | 4175 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 4176 | struct lttng_evaluation **evaluation, |
e8360425 JD |
4177 | const struct notification_thread_state *state, |
4178 | const struct channel_state_sample *previous_sample, | |
4179 | const struct channel_state_sample *latest_sample, | |
4180 | uint64_t previous_session_consumed_total, | |
4181 | uint64_t latest_session_consumed_total, | |
4182 | struct channel_info *channel_info) | |
ab0ee2ca JG |
4183 | { |
4184 | int ret = 0; | |
4185 | enum lttng_condition_type condition_type; | |
e8360425 JD |
4186 | const bool previous_sample_available = !!previous_sample; |
4187 | bool previous_sample_result = false; | |
ab0ee2ca JG |
4188 | bool latest_sample_result; |
4189 | ||
4190 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 4191 | |
e8360425 JD |
4192 | switch (condition_type) { |
4193 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4194 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
4195 | if (caa_likely(previous_sample_available)) { | |
4196 | previous_sample_result = | |
4197 | evaluate_buffer_usage_condition(condition, | |
4198 | previous_sample, channel_info->capacity); | |
4199 | } | |
4200 | latest_sample_result = evaluate_buffer_usage_condition( | |
4201 | condition, latest_sample, | |
4202 | channel_info->capacity); | |
4203 | break; | |
4204 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4205 | if (caa_likely(previous_sample_available)) { | |
4206 | previous_sample_result = | |
4207 | evaluate_session_consumed_size_condition( | |
4208 | condition, | |
4209 | previous_session_consumed_total); | |
4210 | } | |
4211 | latest_sample_result = | |
4212 | evaluate_session_consumed_size_condition( | |
4213 | condition, | |
4214 | latest_session_consumed_total); | |
4215 | break; | |
4216 | default: | |
4217 | /* Unknown condition type; internal error. */ | |
4218 | abort(); | |
4219 | } | |
ab0ee2ca JG |
4220 | |
4221 | if (!latest_sample_result || | |
4222 | (previous_sample_result == latest_sample_result)) { | |
4223 | /* | |
4224 | * Only trigger on a condition evaluation transition. | |
4225 | * | |
4226 | * NOTE: This edge-triggered logic may not be appropriate for | |
4227 | * future condition types. | |
4228 | */ | |
4229 | goto end; | |
4230 | } | |
4231 | ||
e8360425 JD |
4232 | if (!evaluation || !latest_sample_result) { |
4233 | goto end; | |
4234 | } | |
4235 | ||
4236 | switch (condition_type) { | |
4237 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4238 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
4239 | *evaluation = lttng_evaluation_buffer_usage_create( |
4240 | condition_type, | |
4241 | latest_sample->highest_usage, | |
e8360425 JD |
4242 | channel_info->capacity); |
4243 | break; | |
4244 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4245 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
4246 | latest_session_consumed_total); |
4247 | break; | |
4248 | default: | |
4249 | abort(); | |
4250 | } | |
4251 | ||
4252 | if (!*evaluation) { | |
4253 | ret = -1; | |
4254 | goto end; | |
ab0ee2ca JG |
4255 | } |
4256 | end: | |
4257 | return ret; | |
4258 | } | |
4259 | ||
4260 | static | |
f2b3ef9f | 4261 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4262 | { |
f2b3ef9f JG |
4263 | int ret = 0; |
4264 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 4265 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
4266 | }; |
4267 | ||
505b2d90 JG |
4268 | ASSERT_LOCKED(client->lock); |
4269 | ||
f2b3ef9f JG |
4270 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4271 | client->socket); | |
4272 | if (client->communication.outbound.dropped_notification) { | |
4273 | /* | |
4274 | * The client already has a "notification dropped" message | |
4275 | * in its outgoing queue. Nothing to do since all | |
4276 | * of those messages are coalesced. | |
4277 | */ | |
4278 | goto end; | |
4279 | } | |
4280 | ||
4281 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4282 | ret = lttng_dynamic_buffer_append( |
882093ee | 4283 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4284 | sizeof(msg)); |
f2b3ef9f JG |
4285 | if (ret) { |
4286 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4287 | client->socket); | |
4288 | } | |
4289 | end: | |
ab0ee2ca JG |
4290 | return ret; |
4291 | } | |
4292 | ||
f2b3ef9f JG |
4293 | static int client_handle_transmission_status_wrapper( |
4294 | struct notification_client *client, | |
4295 | enum client_transmission_status status, | |
4296 | void *user_data) | |
4297 | { | |
4298 | return client_handle_transmission_status(client, status, | |
4299 | (struct notification_thread_state *) user_data); | |
4300 | } | |
4301 | ||
4302 | static | |
4303 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4304 | const struct lttng_evaluation *evaluation, | |
4305 | struct notification_client_list* client_list, | |
4306 | struct notification_thread_state *state, | |
4307 | uid_t object_uid, gid_t object_gid) | |
4308 | { | |
ff588497 JR |
4309 | const struct lttng_credentials creds = { |
4310 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4311 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4312 | }; | |
4313 | ||
f2b3ef9f | 4314 | return notification_client_list_send_evaluation(client_list, |
52d55cf9 | 4315 | trigger, evaluation, |
ff588497 | 4316 | &creds, |
f2b3ef9f JG |
4317 | client_handle_transmission_status_wrapper, state); |
4318 | } | |
4319 | ||
f37d0f86 JG |
4320 | /* |
4321 | * Permission checks relative to notification channel clients are performed | |
4322 | * here. Notice how object, client, and trigger credentials are involved in | |
4323 | * this check. | |
4324 | * | |
4325 | * The `object` credentials are the credentials associated with the "subject" | |
4326 | * of a condition. For instance, a `rotation completed` condition applies | |
4327 | * to a session. When that condition is met, it will produce an evaluation | |
4328 | * against a session. Hence, in this case, the `object` credentials are the | |
4329 | * credentials of the "subject" session. | |
4330 | * | |
4331 | * The `trigger` credentials are the credentials of the user that registered the | |
4332 | * trigger. | |
4333 | * | |
4334 | * The `client` credentials are the credentials of the user that created a given | |
4335 | * notification channel. | |
4336 | * | |
4337 | * In terms of visibility, it is expected that non-privilieged users can only | |
4338 | * register triggers against "their" objects (their own sessions and | |
4339 | * applications they are allowed to interact with). They can then open a | |
4340 | * notification channel and subscribe to notifications associated with those | |
4341 | * triggers. | |
4342 | * | |
4343 | * As for privilieged users, they can register triggers against the objects of | |
4344 | * other users. They can then subscribe to the notifications associated to their | |
4345 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4346 | * triggers owned by other users; they must create their own triggers. | |
4347 | * | |
4348 | * This is more a concern of usability than security. It would be difficult for | |
4349 | * a root user reliably subscribe to a specific set of conditions without | |
4350 | * interference from external users (those could, for instance, unregister | |
4351 | * their triggers). | |
4352 | */ | |
f2b3ef9f JG |
4353 | int notification_client_list_send_evaluation( |
4354 | struct notification_client_list *client_list, | |
52d55cf9 | 4355 | const struct lttng_trigger *trigger, |
9b63a4aa | 4356 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4357 | const struct lttng_credentials *source_object_creds, |
4358 | report_client_transmission_result_cb client_report, | |
4359 | void *user_data) | |
ab0ee2ca JG |
4360 | { |
4361 | int ret = 0; | |
c0a66c84 | 4362 | struct lttng_payload msg_payload; |
ab0ee2ca | 4363 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4364 | const struct lttng_notification notification = { |
52d55cf9 | 4365 | .trigger = (struct lttng_trigger *) trigger, |
9b63a4aa JG |
4366 | .evaluation = (struct lttng_evaluation *) evaluation, |
4367 | }; | |
3647288f JG |
4368 | struct lttng_notification_channel_message msg_header = { |
4369 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
4370 | }; | |
52d55cf9 JG |
4371 | const struct lttng_credentials *trigger_creds = |
4372 | lttng_trigger_get_credentials(trigger); | |
ab0ee2ca | 4373 | |
c0a66c84 | 4374 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4375 | |
c0a66c84 | 4376 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4377 | sizeof(msg_header)); |
ab0ee2ca JG |
4378 | if (ret) { |
4379 | goto end; | |
4380 | } | |
4381 | ||
c0a66c84 | 4382 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4383 | if (ret) { |
bd0514a5 | 4384 | ERR("Failed to serialize notification"); |
ab0ee2ca JG |
4385 | ret = -1; |
4386 | goto end; | |
4387 | } | |
4388 | ||
3647288f | 4389 | /* Update payload size. */ |
505b2d90 JG |
4390 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4391 | ->size = (uint32_t)( | |
4392 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4393 | |
882093ee JR |
4394 | /* Update the payload number of fds. */ |
4395 | { | |
4396 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4397 | &msg_payload, 0, -1); | |
4398 | ||
4399 | ((struct lttng_notification_channel_message *) | |
4400 | msg_payload.buffer.data)->fds = (uint32_t) | |
4401 | lttng_payload_view_get_fd_handle_count(&pv); | |
4402 | } | |
4403 | ||
505b2d90 | 4404 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 4405 | cds_list_for_each_entry_safe(client_list_element, tmp, |
091fa780 | 4406 | &client_list->clients_list, node) { |
f2b3ef9f | 4407 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4408 | struct notification_client *client = |
4409 | client_list_element->client; | |
4410 | ||
505b2d90 JG |
4411 | ret = 0; |
4412 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4413 | if (!client->communication.active) { |
4414 | /* | |
4415 | * Skip inactive client (protocol error or | |
4416 | * disconnecting). | |
4417 | */ | |
4418 | DBG("Skipping client at it is marked as inactive"); | |
4419 | goto skip_client; | |
4420 | } | |
4421 | ||
f2bda80e JG |
4422 | if (lttng_trigger_is_hidden(trigger) && !client->is_sessiond) { |
4423 | /* | |
4424 | * Notifications resulting from an hidden trigger are | |
4425 | * only sent to the session daemon. | |
4426 | */ | |
70eb2f6f JG |
4427 | DBG("Skipping client as the trigger is hidden and the client is not the session daemon"); |
4428 | goto skip_client; | |
f2bda80e JG |
4429 | } |
4430 | ||
f2b3ef9f | 4431 | if (source_object_creds) { |
ff588497 JR |
4432 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4433 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4434 | client->uid != 0) { |
4435 | /* | |
4436 | * Client is not allowed to monitor this | |
4437 | * object. | |
4438 | */ | |
bd0514a5 | 4439 | DBG("Skipping client at it does not have the object permission to receive notification for this trigger"); |
6c24d3fd | 4440 | goto skip_client; |
f2b3ef9f | 4441 | } |
90843f49 JR |
4442 | } |
4443 | ||
f712e5f6 | 4444 | if (client->uid != lttng_credentials_get_uid(trigger_creds)) { |
bd0514a5 | 4445 | DBG("Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4446 | goto skip_client; |
ab0ee2ca JG |
4447 | } |
4448 | ||
bd0514a5 | 4449 | DBG("Sending notification to client (fd = %i, %zu bytes)", |
c0a66c84 | 4450 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4451 | |
4452 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4453 | /* |
4454 | * Outgoing data is already buffered for this client; | |
4455 | * drop the notification and enqueue a "dropped | |
4456 | * notification" message if this is the first dropped | |
4457 | * notification since the socket spilled-over to the | |
4458 | * queue. | |
4459 | */ | |
f2b3ef9f JG |
4460 | ret = client_notification_overflow(client); |
4461 | if (ret) { | |
6c24d3fd JG |
4462 | /* Fatal error. */ |
4463 | goto skip_client; | |
ab0ee2ca | 4464 | } |
ab0ee2ca JG |
4465 | } |
4466 | ||
882093ee | 4467 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4468 | if (ret) { |
6c24d3fd JG |
4469 | /* Fatal error. */ |
4470 | goto skip_client; | |
ab0ee2ca JG |
4471 | } |
4472 | ||
f2b3ef9f | 4473 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4474 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4475 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4476 | if (ret) { |
6c24d3fd JG |
4477 | /* Fatal error. */ |
4478 | goto end_unlock_list; | |
505b2d90 | 4479 | } |
6c24d3fd JG |
4480 | |
4481 | continue; | |
4482 | ||
4483 | skip_client: | |
505b2d90 JG |
4484 | pthread_mutex_unlock(&client->lock); |
4485 | if (ret) { | |
6c24d3fd | 4486 | /* Fatal error. */ |
505b2d90 | 4487 | goto end_unlock_list; |
ab0ee2ca JG |
4488 | } |
4489 | } | |
4490 | ret = 0; | |
505b2d90 JG |
4491 | |
4492 | end_unlock_list: | |
4493 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4494 | end: |
c0a66c84 | 4495 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4496 | return ret; |
4497 | } | |
4498 | ||
8b524060 FD |
4499 | static |
4500 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4501 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4502 | { |
4503 | int ret; | |
b9a8d78f FD |
4504 | uint64_t token; |
4505 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4506 | char *capture_buffer = NULL; |
4507 | size_t capture_buffer_size; | |
94078603 JR |
4508 | void *reception_buffer; |
4509 | size_t reception_size; | |
4510 | ||
fc4b93fa | 4511 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
b8e2fb80 | 4512 | struct lttng_kernel_abi_event_notifier_notification kernel_notification; |
94078603 | 4513 | |
b9a8d78f | 4514 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4515 | switch(domain) { |
4516 | case LTTNG_DOMAIN_UST: | |
4517 | reception_buffer = (void *) &ust_notification; | |
4518 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4519 | break; |
4520 | case LTTNG_DOMAIN_KERNEL: | |
4521 | reception_buffer = (void *) &kernel_notification; | |
4522 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4523 | break; |
4524 | default: | |
4525 | abort(); | |
4526 | } | |
4527 | ||
4528 | /* | |
4529 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4530 | * ensuring that read/write of tracer notifications are atomic. | |
4531 | */ | |
4532 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4533 | reception_size); | |
4534 | if (ret != reception_size) { | |
4535 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4536 | notification_pipe_read_fd, reception_size, ret); | |
4537 | ret = -1; | |
4538 | goto end; | |
4539 | } | |
4540 | ||
4541 | switch(domain) { | |
4542 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4543 | token = ust_notification.token; |
82b3cbf4 | 4544 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4545 | break; |
4546 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4547 | token = kernel_notification.token; |
bbd6675c | 4548 | capture_buffer_size = kernel_notification.capture_buf_size; |
94078603 JR |
4549 | break; |
4550 | default: | |
4551 | abort(); | |
4552 | } | |
4553 | ||
82b3cbf4 JR |
4554 | if (capture_buffer_size == 0) { |
4555 | capture_buffer = NULL; | |
4556 | goto skip_capture; | |
4557 | } | |
4558 | ||
4559 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
bd0514a5 | 4560 | 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 |
4561 | capture_buffer_size, MAX_CAPTURE_SIZE); |
4562 | goto end; | |
4563 | } | |
4564 | ||
7966af57 | 4565 | capture_buffer = (char *) zmalloc(capture_buffer_size); |
82b3cbf4 | 4566 | if (!capture_buffer) { |
bd0514a5 | 4567 | ERR("Failed to allocate capture buffer"); |
82b3cbf4 JR |
4568 | goto end; |
4569 | } | |
4570 | ||
4571 | /* Fetch additional payload (capture). */ | |
4572 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4573 | if (ret != capture_buffer_size) { | |
bd0514a5 | 4574 | ERR("Failed to read from event source pipe (fd = %i)", |
82b3cbf4 JR |
4575 | notification_pipe_read_fd); |
4576 | goto end; | |
4577 | } | |
4578 | ||
4579 | skip_capture: | |
4580 | notification = lttng_event_notifier_notification_create(token, domain, | |
4581 | capture_buffer, capture_buffer_size); | |
4582 | if (notification == NULL) { | |
4583 | goto end; | |
4584 | } | |
4585 | ||
4586 | /* | |
4587 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4588 | */ | |
4589 | capture_buffer = NULL; | |
4590 | ||
b9a8d78f | 4591 | end: |
82b3cbf4 | 4592 | free(capture_buffer); |
b9a8d78f FD |
4593 | return notification; |
4594 | } | |
4595 | ||
8b524060 FD |
4596 | static |
4597 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4598 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4599 | { |
b9a8d78f FD |
4600 | struct cds_lfht_node *node; |
4601 | struct cds_lfht_iter iter; | |
4602 | struct notification_trigger_tokens_ht_element *element; | |
4603 | struct lttng_evaluation *evaluation = NULL; | |
b9a8d78f FD |
4604 | enum action_executor_status executor_status; |
4605 | struct notification_client_list *client_list = NULL; | |
8b524060 | 4606 | int ret; |
7c920b63 | 4607 | unsigned int capture_count = 0; |
b9a8d78f | 4608 | |
94078603 JR |
4609 | /* Find triggers associated with this token. */ |
4610 | rcu_read_lock(); | |
4611 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4612 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4613 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4614 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4615 | if (caa_unlikely(!node)) { |
94078603 | 4616 | /* |
f1446131 JR |
4617 | * This is not an error, slow consumption of the tracer |
4618 | * notifications can lead to situations where a trigger is | |
4619 | * removed but we still get tracer notifications matching a | |
4620 | * trigger that no longer exists. | |
94078603 JR |
4621 | */ |
4622 | ret = 0; | |
4623 | goto end_unlock; | |
4624 | } | |
4625 | ||
4626 | element = caa_container_of(node, | |
4627 | struct notification_trigger_tokens_ht_element, | |
4628 | node); | |
4629 | ||
8dbb86b8 | 4630 | if (lttng_condition_event_rule_matches_get_capture_descriptor_count( |
7c920b63 PP |
4631 | lttng_trigger_get_const_condition(element->trigger), |
4632 | &capture_count) != LTTNG_CONDITION_STATUS_OK) { | |
4633 | ERR("Failed to get capture count"); | |
4634 | ret = -1; | |
4635 | goto end; | |
4636 | } | |
4637 | ||
4638 | if (!notification->capture_buffer && capture_count != 0) { | |
4639 | ERR("Expected capture but capture buffer is null"); | |
4640 | ret = -1; | |
4641 | goto end; | |
4642 | } | |
4643 | ||
8dbb86b8 | 4644 | evaluation = lttng_evaluation_event_rule_matches_create( |
7c920b63 PP |
4645 | container_of(lttng_trigger_get_const_condition( |
4646 | element->trigger), | |
8dbb86b8 | 4647 | struct lttng_condition_event_rule_matches, |
7c920b63 | 4648 | parent), |
7c920b63 PP |
4649 | notification->capture_buffer, |
4650 | notification->capture_buf_size, false); | |
4651 | ||
f1446131 | 4652 | if (evaluation == NULL) { |
8c1d25ff | 4653 | ERR("Failed to create event rule matches evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4654 | ret = -1; |
4655 | goto end_unlock; | |
4656 | } | |
8c1d25ff | 4657 | |
f1446131 JR |
4658 | client_list = get_client_list_from_condition(state, |
4659 | lttng_trigger_get_const_condition(element->trigger)); | |
72365501 | 4660 | executor_status = action_executor_enqueue_trigger(state->executor, |
f1446131 JR |
4661 | element->trigger, evaluation, NULL, client_list); |
4662 | switch (executor_status) { | |
4663 | case ACTION_EXECUTOR_STATUS_OK: | |
4664 | ret = 0; | |
4665 | break; | |
4666 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4667 | { | |
4668 | struct notification_client_list_element *client_list_element, | |
4669 | *tmp; | |
4670 | ||
4671 | /* | |
4672 | * Not a fatal error; this is expected and simply means the | |
4673 | * executor has too much work queued already. | |
4674 | */ | |
4675 | ret = 0; | |
4676 | ||
4677 | /* No clients subscribed to notifications for this trigger. */ | |
4678 | if (!client_list) { | |
4679 | break; | |
4680 | } | |
4681 | ||
4682 | /* Warn clients that a notification (or more) was dropped. */ | |
4683 | pthread_mutex_lock(&client_list->lock); | |
4684 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 4685 | &client_list->clients_list, node) { |
f1446131 JR |
4686 | enum client_transmission_status transmission_status; |
4687 | struct notification_client *client = | |
4688 | client_list_element->client; | |
4689 | ||
4690 | pthread_mutex_lock(&client->lock); | |
4691 | ret = client_notification_overflow(client); | |
4692 | if (ret) { | |
4693 | /* Fatal error. */ | |
4694 | goto next_client; | |
4695 | } | |
4696 | ||
4697 | transmission_status = | |
4698 | client_flush_outgoing_queue(client); | |
4699 | ret = client_handle_transmission_status( | |
4700 | client, transmission_status, state); | |
4701 | if (ret) { | |
4702 | /* Fatal error. */ | |
4703 | goto next_client; | |
4704 | } | |
4705 | next_client: | |
4706 | pthread_mutex_unlock(&client->lock); | |
4707 | if (ret) { | |
4708 | break; | |
4709 | } | |
4710 | } | |
4711 | ||
4712 | pthread_mutex_unlock(&client_list->lock); | |
4713 | break; | |
4714 | } | |
98dfca79 | 4715 | case ACTION_EXECUTOR_STATUS_INVALID: |
f1446131 JR |
4716 | case ACTION_EXECUTOR_STATUS_ERROR: |
4717 | /* Fatal error, shut down everything. */ | |
4718 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4719 | ret = -1; | |
4720 | goto end_unlock; | |
4721 | default: | |
4722 | /* Unhandled error. */ | |
4723 | abort(); | |
4724 | } | |
94078603 JR |
4725 | |
4726 | end_unlock: | |
f1446131 | 4727 | notification_client_list_put(client_list); |
94078603 | 4728 | rcu_read_unlock(); |
7c920b63 | 4729 | end: |
8b524060 FD |
4730 | return ret; |
4731 | } | |
4732 | ||
4733 | static | |
4734 | int handle_one_event_notifier_notification( | |
4735 | struct notification_thread_state *state, | |
4736 | int pipe, enum lttng_domain_type domain) | |
4737 | { | |
82b3cbf4 | 4738 | int ret = 0; |
8b524060 FD |
4739 | struct lttng_event_notifier_notification *notification = NULL; |
4740 | ||
4741 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4742 | if (notification == NULL) { | |
82b3cbf4 | 4743 | /* Reception failed, don't consider it fatal. */ |
bd0514a5 | 4744 | ERR("Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 | 4745 | pipe, lttng_domain_type_str(domain)); |
8b524060 FD |
4746 | goto end; |
4747 | } | |
4748 | ||
4749 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4750 | if (ret) { | |
bd0514a5 | 4751 | ERR("Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 FD |
4752 | pipe, lttng_domain_type_str(domain)); |
4753 | goto end; | |
4754 | } | |
4755 | ||
94078603 | 4756 | end: |
8b524060 | 4757 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4758 | return ret; |
4759 | } | |
4760 | ||
8b524060 FD |
4761 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4762 | int pipe, enum lttng_domain_type domain) | |
4763 | { | |
4764 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4765 | } | |
4766 | ||
ab0ee2ca JG |
4767 | int handle_notification_thread_channel_sample( |
4768 | struct notification_thread_state *state, int pipe, | |
4769 | enum lttng_domain_type domain) | |
4770 | { | |
4771 | int ret = 0; | |
4772 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4773 | struct channel_info *channel_info; |
4774 | struct cds_lfht_node *node; | |
4775 | struct cds_lfht_iter iter; | |
4776 | struct lttng_channel_trigger_list *trigger_list; | |
4777 | struct lttng_trigger_list_element *trigger_list_element; | |
4778 | bool previous_sample_available = false; | |
e8360425 JD |
4779 | struct channel_state_sample previous_sample, latest_sample; |
4780 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4781 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4782 | |
4783 | /* | |
4784 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4785 | * ensuring that read/write of sampling messages are atomic. | |
4786 | */ | |
7c2551ef | 4787 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca | 4788 | if (ret != sizeof(sample_msg)) { |
bd0514a5 | 4789 | ERR("Failed to read from monitoring pipe (fd = %i)", |
ab0ee2ca JG |
4790 | pipe); |
4791 | ret = -1; | |
4792 | goto end; | |
4793 | } | |
4794 | ||
4795 | ret = 0; | |
4796 | latest_sample.key.key = sample_msg.key; | |
4797 | latest_sample.key.domain = domain; | |
4798 | latest_sample.highest_usage = sample_msg.highest; | |
4799 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4800 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4801 | |
4802 | rcu_read_lock(); | |
4803 | ||
4804 | /* Retrieve the channel's informations */ | |
4805 | cds_lfht_lookup(state->channels_ht, | |
4806 | hash_channel_key(&latest_sample.key), | |
4807 | match_channel_info, | |
4808 | &latest_sample.key, | |
4809 | &iter); | |
4810 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4811 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4812 | /* |
4813 | * Not an error since the consumer can push a sample to the pipe | |
4814 | * and the rest of the session daemon could notify us of the | |
4815 | * channel's destruction before we get a chance to process that | |
4816 | * sample. | |
4817 | */ | |
bd0514a5 | 4818 | DBG("Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", |
ab0ee2ca | 4819 | latest_sample.key.key, |
526200e4 | 4820 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4821 | goto end_unlock; |
4822 | } | |
4823 | channel_info = caa_container_of(node, struct channel_info, | |
4824 | channels_ht_node); | |
bd0514a5 | 4825 | DBG("Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4826 | channel_info->name, |
ab0ee2ca | 4827 | latest_sample.key.key, |
8abe313a | 4828 | channel_info->session_info->name, |
ab0ee2ca | 4829 | latest_sample.highest_usage, |
e8360425 JD |
4830 | latest_sample.lowest_usage, |
4831 | latest_sample.channel_total_consumed); | |
4832 | ||
4833 | previous_session_consumed_total = | |
4834 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4835 | |
4836 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4837 | cds_lfht_lookup(state->channel_state_ht, | |
4838 | hash_channel_key(&latest_sample.key), | |
4839 | match_channel_state_sample, | |
4840 | &latest_sample.key, | |
4841 | &iter); | |
4842 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4843 | if (caa_likely(node)) { |
ab0ee2ca JG |
4844 | struct channel_state_sample *stored_sample; |
4845 | ||
4846 | /* Update the sample stored. */ | |
4847 | stored_sample = caa_container_of(node, | |
4848 | struct channel_state_sample, | |
4849 | channel_state_ht_node); | |
e8360425 | 4850 | |
ab0ee2ca JG |
4851 | memcpy(&previous_sample, stored_sample, |
4852 | sizeof(previous_sample)); | |
4853 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4854 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4855 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4856 | previous_sample_available = true; |
e8360425 JD |
4857 | |
4858 | latest_session_consumed_total = | |
4859 | previous_session_consumed_total + | |
4860 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4861 | } else { |
4862 | /* | |
4863 | * This is the channel's first sample, allocate space for and | |
4864 | * store the new sample. | |
4865 | */ | |
4866 | struct channel_state_sample *stored_sample; | |
4867 | ||
7966af57 | 4868 | stored_sample = (channel_state_sample *) zmalloc(sizeof(*stored_sample)); |
ab0ee2ca JG |
4869 | if (!stored_sample) { |
4870 | ret = -1; | |
4871 | goto end_unlock; | |
4872 | } | |
4873 | ||
4874 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4875 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4876 | cds_lfht_add(state->channel_state_ht, | |
4877 | hash_channel_key(&stored_sample->key), | |
4878 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4879 | |
4880 | latest_session_consumed_total = | |
4881 | previous_session_consumed_total + | |
4882 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4883 | } |
4884 | ||
e8360425 JD |
4885 | channel_info->session_info->consumed_data_size = |
4886 | latest_session_consumed_total; | |
4887 | ||
ab0ee2ca JG |
4888 | /* Find triggers associated with this channel. */ |
4889 | cds_lfht_lookup(state->channel_triggers_ht, | |
4890 | hash_channel_key(&latest_sample.key), | |
4891 | match_channel_trigger_list, | |
4892 | &latest_sample.key, | |
4893 | &iter); | |
4894 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4895 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4896 | goto end_unlock; |
4897 | } | |
4898 | ||
f2b3ef9f | 4899 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
4900 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
4901 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
4902 | }; |
4903 | ||
ab0ee2ca JG |
4904 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
4905 | channel_triggers_ht_node); | |
4906 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 4907 | node) { |
9b63a4aa | 4908 | const struct lttng_condition *condition; |
f2b3ef9f | 4909 | struct lttng_trigger *trigger; |
505b2d90 | 4910 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 4911 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 4912 | enum action_executor_status executor_status; |
ab0ee2ca | 4913 | |
505b2d90 | 4914 | ret = 0; |
ab0ee2ca | 4915 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4916 | condition = lttng_trigger_get_const_condition(trigger); |
a0377dfe | 4917 | LTTNG_ASSERT(condition); |
ab0ee2ca JG |
4918 | |
4919 | /* | |
4920 | * Check if any client is subscribed to the result of this | |
4921 | * evaluation. | |
4922 | */ | |
ed327204 | 4923 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 4924 | |
ed327204 | 4925 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4926 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4927 | &latest_sample, |
4928 | previous_session_consumed_total, | |
4929 | latest_session_consumed_total, | |
4930 | channel_info); | |
4931 | if (caa_unlikely(ret)) { | |
505b2d90 | 4932 | goto put_list; |
ab0ee2ca JG |
4933 | } |
4934 | ||
e8360425 | 4935 | if (caa_likely(!evaluation)) { |
505b2d90 | 4936 | goto put_list; |
ab0ee2ca JG |
4937 | } |
4938 | ||
f2b3ef9f JG |
4939 | /* |
4940 | * Ownership of `evaluation` transferred to the action executor | |
4941 | * no matter the result. | |
4942 | */ | |
72365501 JR |
4943 | executor_status = action_executor_enqueue_trigger( |
4944 | state->executor, trigger, evaluation, | |
4945 | &channel_creds, client_list); | |
f2b3ef9f JG |
4946 | evaluation = NULL; |
4947 | switch (executor_status) { | |
4948 | case ACTION_EXECUTOR_STATUS_OK: | |
4949 | break; | |
4950 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4951 | case ACTION_EXECUTOR_STATUS_INVALID: | |
4952 | /* | |
4953 | * TODO Add trigger identification (name/id) when | |
4954 | * it is added to the API. | |
4955 | */ | |
4956 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
4957 | ret = -1; | |
4958 | goto put_list; | |
4959 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4960 | /* | |
4961 | * TODO Add trigger identification (name/id) when | |
4962 | * it is added to the API. | |
4963 | * | |
4964 | * Not a fatal error. | |
4965 | */ | |
4966 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
4967 | ret = 0; | |
4968 | goto put_list; | |
4969 | default: | |
4970 | abort(); | |
4971 | } | |
4972 | ||
505b2d90 JG |
4973 | put_list: |
4974 | notification_client_list_put(client_list); | |
e0b5f87b | 4975 | if (caa_unlikely(ret)) { |
505b2d90 | 4976 | break; |
ab0ee2ca JG |
4977 | } |
4978 | } | |
4979 | end_unlock: | |
4980 | rcu_read_unlock(); | |
4981 | end: | |
4982 | return ret; | |
4983 | } |