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