Commit | Line | Data |
---|---|---|
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> |
ab0ee2ca | 29 | #include <lttng/notification/channel-internal.h> |
85c06c44 | 30 | #include <lttng/trigger/trigger-internal.h> |
1da26331 | 31 | |
ab0ee2ca JG |
32 | #include <time.h> |
33 | #include <unistd.h> | |
34 | #include <assert.h> | |
35 | #include <inttypes.h> | |
d53ea4e4 | 36 | #include <fcntl.h> |
ab0ee2ca | 37 | |
1da26331 JG |
38 | #include "notification-thread.h" |
39 | #include "notification-thread-events.h" | |
40 | #include "notification-thread-commands.h" | |
41 | #include "lttng-sessiond.h" | |
42 | #include "kernel.h" | |
43 | ||
ab0ee2ca JG |
44 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
45 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
46 | ||
51eab943 JG |
47 | enum lttng_object_type { |
48 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
49 | LTTNG_OBJECT_TYPE_NONE, | |
50 | LTTNG_OBJECT_TYPE_CHANNEL, | |
51 | LTTNG_OBJECT_TYPE_SESSION, | |
52 | }; | |
53 | ||
ab0ee2ca | 54 | struct lttng_trigger_list_element { |
9e0bb80e | 55 | /* No ownership of the trigger object is assumed. */ |
f2b3ef9f | 56 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
57 | struct cds_list_head node; |
58 | }; | |
59 | ||
60 | struct lttng_channel_trigger_list { | |
61 | struct channel_key channel_key; | |
ea9a44f0 | 62 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 63 | struct cds_list_head list; |
ea9a44f0 | 64 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 65 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
66 | /* call_rcu delayed reclaim. */ |
67 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
68 | }; |
69 | ||
ea9a44f0 JG |
70 | /* |
71 | * List of triggers applying to a given session. | |
72 | * | |
73 | * See: | |
74 | * - lttng_session_trigger_list_create() | |
75 | * - lttng_session_trigger_list_build() | |
76 | * - lttng_session_trigger_list_destroy() | |
77 | * - lttng_session_trigger_list_add() | |
78 | */ | |
79 | struct lttng_session_trigger_list { | |
80 | /* | |
81 | * Not owned by this; points to the session_info structure's | |
82 | * session name. | |
83 | */ | |
84 | const char *session_name; | |
85 | /* List of struct lttng_trigger_list_element. */ | |
86 | struct cds_list_head list; | |
87 | /* Node in the session_triggers_ht */ | |
88 | struct cds_lfht_node session_triggers_ht_node; | |
89 | /* | |
90 | * Weak reference to the notification system's session triggers | |
91 | * hashtable. | |
92 | * | |
93 | * The session trigger list structure structure is owned by | |
94 | * the session's session_info. | |
95 | * | |
96 | * The session_info is kept alive the the channel_infos holding a | |
97 | * reference to it (reference counting). When those channels are | |
98 | * destroyed (at runtime or on teardown), the reference they hold | |
99 | * to the session_info are released. On destruction of session_info, | |
100 | * session_info_destroy() will remove the list of triggers applying | |
101 | * to this session from the notification system's state. | |
102 | * | |
103 | * This implies that the session_triggers_ht must be destroyed | |
104 | * after the channels. | |
105 | */ | |
106 | struct cds_lfht *session_triggers_ht; | |
107 | /* Used for delayed RCU reclaim. */ | |
108 | struct rcu_head rcu_node; | |
109 | }; | |
110 | ||
ab0ee2ca JG |
111 | struct lttng_trigger_ht_element { |
112 | struct lttng_trigger *trigger; | |
113 | struct cds_lfht_node node; | |
83b934ad MD |
114 | /* call_rcu delayed reclaim. */ |
115 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
116 | }; |
117 | ||
118 | struct lttng_condition_list_element { | |
119 | struct lttng_condition *condition; | |
120 | struct cds_list_head node; | |
121 | }; | |
122 | ||
ab0ee2ca JG |
123 | struct channel_state_sample { |
124 | struct channel_key key; | |
125 | struct cds_lfht_node channel_state_ht_node; | |
126 | uint64_t highest_usage; | |
127 | uint64_t lowest_usage; | |
e8360425 | 128 | uint64_t channel_total_consumed; |
83b934ad MD |
129 | /* call_rcu delayed reclaim. */ |
130 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
131 | }; |
132 | ||
e4db5ace | 133 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 134 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 135 | struct lttng_evaluation **evaluation, |
e8360425 JD |
136 | const struct notification_thread_state *state, |
137 | const struct channel_state_sample *previous_sample, | |
138 | const struct channel_state_sample *latest_sample, | |
139 | uint64_t previous_session_consumed_total, | |
140 | uint64_t latest_session_consumed_total, | |
141 | struct channel_info *channel_info); | |
e4db5ace | 142 | static |
9b63a4aa JG |
143 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
144 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
145 | struct notification_client_list *client_list, |
146 | struct notification_thread_state *state, | |
147 | uid_t channel_uid, gid_t channel_gid); | |
148 | ||
8abe313a | 149 | |
ea9a44f0 | 150 | /* session_info API */ |
8abe313a JG |
151 | static |
152 | void session_info_destroy(void *_data); | |
153 | static | |
154 | void session_info_get(struct session_info *session_info); | |
155 | static | |
156 | void session_info_put(struct session_info *session_info); | |
157 | static | |
158 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 159 | uid_t uid, gid_t gid, |
1eee26c5 JG |
160 | struct lttng_session_trigger_list *trigger_list, |
161 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
162 | static |
163 | void session_info_add_channel(struct session_info *session_info, | |
164 | struct channel_info *channel_info); | |
165 | static | |
166 | void session_info_remove_channel(struct session_info *session_info, | |
167 | struct channel_info *channel_info); | |
168 | ||
ea9a44f0 JG |
169 | /* lttng_session_trigger_list API */ |
170 | static | |
171 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
172 | const char *session_name, | |
173 | struct cds_lfht *session_triggers_ht); | |
174 | static | |
175 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
176 | const struct notification_thread_state *state, | |
177 | const char *session_name); | |
178 | static | |
179 | void lttng_session_trigger_list_destroy( | |
180 | struct lttng_session_trigger_list *list); | |
181 | static | |
182 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 183 | struct lttng_trigger *trigger); |
ea9a44f0 | 184 | |
f2b3ef9f JG |
185 | static |
186 | int client_handle_transmission_status( | |
187 | struct notification_client *client, | |
188 | enum client_transmission_status transmission_status, | |
189 | struct notification_thread_state *state); | |
ea9a44f0 | 190 | |
ab0ee2ca | 191 | static |
ac1889bf | 192 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
193 | { |
194 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
195 | const int socket = (int) (intptr_t) key; |
196 | const struct notification_client *client = caa_container_of(node, | |
197 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 198 | |
ac1889bf JG |
199 | return client->socket == socket; |
200 | } | |
201 | ||
202 | static | |
203 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
204 | { | |
205 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
206 | const notification_client_id id = *((notification_client_id *) key); | |
207 | const struct notification_client *client = caa_container_of( | |
208 | node, struct notification_client, client_id_ht_node); | |
ab0ee2ca | 209 | |
ac1889bf | 210 | return client->id == id; |
ab0ee2ca JG |
211 | } |
212 | ||
213 | static | |
214 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
215 | { | |
216 | struct channel_key *channel_key = (struct channel_key *) key; | |
217 | struct lttng_channel_trigger_list *trigger_list; | |
218 | ||
219 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
220 | channel_triggers_ht_node); | |
221 | ||
222 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
223 | (channel_key->domain == trigger_list->channel_key.domain)); | |
224 | } | |
225 | ||
51eab943 JG |
226 | static |
227 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
228 | { | |
229 | const char *session_name = (const char *) key; | |
230 | struct lttng_session_trigger_list *trigger_list; | |
231 | ||
232 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
233 | session_triggers_ht_node); | |
234 | ||
235 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
236 | } | |
237 | ||
ab0ee2ca JG |
238 | static |
239 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
240 | { | |
241 | struct channel_key *channel_key = (struct channel_key *) key; | |
242 | struct channel_state_sample *sample; | |
243 | ||
244 | sample = caa_container_of(node, struct channel_state_sample, | |
245 | channel_state_ht_node); | |
246 | ||
247 | return !!((channel_key->key == sample->key.key) && | |
248 | (channel_key->domain == sample->key.domain)); | |
249 | } | |
250 | ||
251 | static | |
252 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
253 | { | |
254 | struct channel_key *channel_key = (struct channel_key *) key; | |
255 | struct channel_info *channel_info; | |
256 | ||
257 | channel_info = caa_container_of(node, struct channel_info, | |
258 | channels_ht_node); | |
259 | ||
260 | return !!((channel_key->key == channel_info->key.key) && | |
261 | (channel_key->domain == channel_info->key.domain)); | |
262 | } | |
263 | ||
264 | static | |
265 | int match_condition(struct cds_lfht_node *node, const void *key) | |
266 | { | |
267 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
268 | struct lttng_trigger_ht_element *trigger; | |
269 | struct lttng_condition *condition; | |
270 | ||
271 | trigger = caa_container_of(node, struct lttng_trigger_ht_element, | |
272 | node); | |
273 | condition = lttng_trigger_get_condition(trigger->trigger); | |
274 | assert(condition); | |
275 | ||
276 | return !!lttng_condition_is_equal(condition_key, condition); | |
277 | } | |
278 | ||
ab0ee2ca JG |
279 | static |
280 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
281 | { | |
282 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
283 | struct notification_client_list *client_list; | |
f82f93a1 | 284 | const struct lttng_condition *condition; |
ab0ee2ca JG |
285 | |
286 | assert(condition_key); | |
287 | ||
288 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 289 | notification_trigger_clients_ht_node); |
f82f93a1 | 290 | condition = lttng_trigger_get_const_condition(client_list->trigger); |
ab0ee2ca JG |
291 | |
292 | return !!lttng_condition_is_equal(condition_key, condition); | |
293 | } | |
294 | ||
f82f93a1 JG |
295 | static |
296 | int match_session(struct cds_lfht_node *node, const void *key) | |
297 | { | |
298 | const char *name = key; | |
299 | struct session_info *session_info = caa_container_of( | |
300 | node, struct session_info, sessions_ht_node); | |
301 | ||
302 | return !strcmp(session_info->name, name); | |
303 | } | |
304 | ||
ab0ee2ca JG |
305 | static |
306 | unsigned long lttng_condition_buffer_usage_hash( | |
9b63a4aa | 307 | const struct lttng_condition *_condition) |
ab0ee2ca | 308 | { |
9a2746aa JG |
309 | unsigned long hash; |
310 | unsigned long condition_type; | |
ab0ee2ca JG |
311 | struct lttng_condition_buffer_usage *condition; |
312 | ||
313 | condition = container_of(_condition, | |
314 | struct lttng_condition_buffer_usage, parent); | |
315 | ||
9a2746aa JG |
316 | condition_type = (unsigned long) condition->parent.type; |
317 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
ab0ee2ca JG |
318 | if (condition->session_name) { |
319 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
320 | } | |
321 | if (condition->channel_name) { | |
8f56701f | 322 | hash ^= hash_key_str(condition->channel_name, lttng_ht_seed); |
ab0ee2ca JG |
323 | } |
324 | if (condition->domain.set) { | |
325 | hash ^= hash_key_ulong( | |
326 | (void *) condition->domain.type, | |
327 | lttng_ht_seed); | |
328 | } | |
329 | if (condition->threshold_ratio.set) { | |
330 | uint64_t val; | |
331 | ||
332 | val = condition->threshold_ratio.value * (double) UINT32_MAX; | |
333 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
6633b0dd | 334 | } else if (condition->threshold_bytes.set) { |
ab0ee2ca JG |
335 | uint64_t val; |
336 | ||
337 | val = condition->threshold_bytes.value; | |
338 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
339 | } | |
340 | return hash; | |
341 | } | |
342 | ||
e8360425 JD |
343 | static |
344 | unsigned long lttng_condition_session_consumed_size_hash( | |
9b63a4aa | 345 | const struct lttng_condition *_condition) |
e8360425 | 346 | { |
9a2746aa JG |
347 | unsigned long hash; |
348 | unsigned long condition_type = | |
349 | (unsigned long) LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE; | |
e8360425 JD |
350 | struct lttng_condition_session_consumed_size *condition; |
351 | uint64_t val; | |
352 | ||
353 | condition = container_of(_condition, | |
354 | struct lttng_condition_session_consumed_size, parent); | |
355 | ||
9a2746aa | 356 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); |
e8360425 JD |
357 | if (condition->session_name) { |
358 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
359 | } | |
360 | val = condition->consumed_threshold_bytes.value; | |
361 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
362 | return hash; | |
363 | } | |
364 | ||
a8393880 JG |
365 | static |
366 | unsigned long lttng_condition_session_rotation_hash( | |
367 | const struct lttng_condition *_condition) | |
368 | { | |
369 | unsigned long hash, condition_type; | |
370 | struct lttng_condition_session_rotation *condition; | |
371 | ||
372 | condition = container_of(_condition, | |
373 | struct lttng_condition_session_rotation, parent); | |
374 | condition_type = (unsigned long) condition->parent.type; | |
375 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
376 | assert(condition->session_name); | |
377 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
378 | return hash; | |
379 | } | |
9a2746aa | 380 | |
ab0ee2ca JG |
381 | /* |
382 | * The lttng_condition hashing code is kept in this file (rather than | |
383 | * condition.c) since it makes use of GPLv2 code (hashtable utils), which we | |
384 | * don't want to link in liblttng-ctl. | |
385 | */ | |
386 | static | |
9b63a4aa | 387 | unsigned long lttng_condition_hash(const struct lttng_condition *condition) |
ab0ee2ca JG |
388 | { |
389 | switch (condition->type) { | |
390 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
391 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
392 | return lttng_condition_buffer_usage_hash(condition); | |
e8360425 JD |
393 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: |
394 | return lttng_condition_session_consumed_size_hash(condition); | |
a8393880 JG |
395 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
396 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
397 | return lttng_condition_session_rotation_hash(condition); | |
ab0ee2ca JG |
398 | default: |
399 | ERR("[notification-thread] Unexpected condition type caught"); | |
400 | abort(); | |
401 | } | |
402 | } | |
403 | ||
e4db5ace JR |
404 | static |
405 | unsigned long hash_channel_key(struct channel_key *key) | |
406 | { | |
407 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
408 | unsigned long domain_hash = hash_key_ulong( | |
409 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
410 | ||
411 | return key_hash ^ domain_hash; | |
412 | } | |
413 | ||
ac1889bf JG |
414 | static |
415 | unsigned long hash_client_socket(int socket) | |
416 | { | |
417 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
418 | } | |
419 | ||
420 | static | |
421 | unsigned long hash_client_id(notification_client_id id) | |
422 | { | |
423 | return hash_key_u64(&id, lttng_ht_seed); | |
424 | } | |
425 | ||
f82f93a1 JG |
426 | /* |
427 | * Get the type of object to which a given condition applies. Bindings let | |
428 | * the notification system evaluate a trigger's condition when a given | |
429 | * object's state is updated. | |
430 | * | |
431 | * For instance, a condition bound to a channel will be evaluated everytime | |
432 | * the channel's state is changed by a channel monitoring sample. | |
433 | */ | |
434 | static | |
435 | enum lttng_object_type get_condition_binding_object( | |
436 | const struct lttng_condition *condition) | |
437 | { | |
438 | switch (lttng_condition_get_type(condition)) { | |
439 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
440 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
441 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 442 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
443 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
444 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
445 | return LTTNG_OBJECT_TYPE_SESSION; | |
446 | default: | |
447 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
448 | } | |
449 | } | |
450 | ||
83b934ad MD |
451 | static |
452 | void free_channel_info_rcu(struct rcu_head *node) | |
453 | { | |
454 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
455 | } | |
456 | ||
ab0ee2ca JG |
457 | static |
458 | void channel_info_destroy(struct channel_info *channel_info) | |
459 | { | |
460 | if (!channel_info) { | |
461 | return; | |
462 | } | |
463 | ||
8abe313a JG |
464 | if (channel_info->session_info) { |
465 | session_info_remove_channel(channel_info->session_info, | |
466 | channel_info); | |
467 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 468 | } |
8abe313a JG |
469 | if (channel_info->name) { |
470 | free(channel_info->name); | |
ab0ee2ca | 471 | } |
83b934ad MD |
472 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
473 | } | |
474 | ||
475 | static | |
476 | void free_session_info_rcu(struct rcu_head *node) | |
477 | { | |
478 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
479 | } |
480 | ||
8abe313a | 481 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 482 | static |
8abe313a | 483 | void session_info_destroy(void *_data) |
ab0ee2ca | 484 | { |
8abe313a | 485 | struct session_info *session_info = _data; |
3b68d0a3 | 486 | int ret; |
ab0ee2ca | 487 | |
8abe313a JG |
488 | assert(session_info); |
489 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
490 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
491 | if (ret) { | |
4c3f302b | 492 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 493 | } |
8abe313a | 494 | } |
ea9a44f0 | 495 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
496 | |
497 | rcu_read_lock(); | |
498 | cds_lfht_del(session_info->sessions_ht, | |
499 | &session_info->sessions_ht_node); | |
500 | rcu_read_unlock(); | |
8abe313a | 501 | free(session_info->name); |
83b934ad | 502 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 503 | } |
ab0ee2ca | 504 | |
8abe313a JG |
505 | static |
506 | void session_info_get(struct session_info *session_info) | |
507 | { | |
508 | if (!session_info) { | |
509 | return; | |
510 | } | |
511 | lttng_ref_get(&session_info->ref); | |
512 | } | |
513 | ||
514 | static | |
515 | void session_info_put(struct session_info *session_info) | |
516 | { | |
517 | if (!session_info) { | |
518 | return; | |
ab0ee2ca | 519 | } |
8abe313a JG |
520 | lttng_ref_put(&session_info->ref); |
521 | } | |
522 | ||
523 | static | |
ea9a44f0 | 524 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
525 | struct lttng_session_trigger_list *trigger_list, |
526 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
527 | { |
528 | struct session_info *session_info; | |
ab0ee2ca | 529 | |
8abe313a | 530 | assert(name); |
ab0ee2ca | 531 | |
8abe313a JG |
532 | session_info = zmalloc(sizeof(*session_info)); |
533 | if (!session_info) { | |
534 | goto end; | |
535 | } | |
536 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
537 | ||
538 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
539 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
540 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
541 | goto error; |
542 | } | |
8abe313a JG |
543 | |
544 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
545 | session_info->name = strdup(name); | |
546 | if (!session_info->name) { | |
ab0ee2ca JG |
547 | goto error; |
548 | } | |
8abe313a JG |
549 | session_info->uid = uid; |
550 | session_info->gid = gid; | |
ea9a44f0 | 551 | session_info->trigger_list = trigger_list; |
1eee26c5 | 552 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
553 | end: |
554 | return session_info; | |
555 | error: | |
556 | session_info_put(session_info); | |
557 | return NULL; | |
558 | } | |
559 | ||
560 | static | |
561 | void session_info_add_channel(struct session_info *session_info, | |
562 | struct channel_info *channel_info) | |
563 | { | |
564 | rcu_read_lock(); | |
565 | cds_lfht_add(session_info->channel_infos_ht, | |
566 | hash_channel_key(&channel_info->key), | |
567 | &channel_info->session_info_channels_ht_node); | |
568 | rcu_read_unlock(); | |
569 | } | |
570 | ||
571 | static | |
572 | void session_info_remove_channel(struct session_info *session_info, | |
573 | struct channel_info *channel_info) | |
574 | { | |
575 | rcu_read_lock(); | |
576 | cds_lfht_del(session_info->channel_infos_ht, | |
577 | &channel_info->session_info_channels_ht_node); | |
578 | rcu_read_unlock(); | |
579 | } | |
580 | ||
581 | static | |
582 | struct channel_info *channel_info_create(const char *channel_name, | |
583 | struct channel_key *channel_key, uint64_t channel_capacity, | |
584 | struct session_info *session_info) | |
585 | { | |
586 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
587 | ||
588 | if (!channel_info) { | |
589 | goto end; | |
590 | } | |
591 | ||
ab0ee2ca | 592 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
593 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
594 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
595 | channel_info->capacity = channel_capacity; | |
596 | ||
597 | channel_info->name = strdup(channel_name); | |
598 | if (!channel_info->name) { | |
599 | goto error; | |
600 | } | |
601 | ||
602 | /* | |
603 | * Set the references between session and channel infos: | |
604 | * - channel_info holds a strong reference to session_info | |
605 | * - session_info holds a weak reference to channel_info | |
606 | */ | |
607 | session_info_get(session_info); | |
608 | session_info_add_channel(session_info, channel_info); | |
609 | channel_info->session_info = session_info; | |
ab0ee2ca | 610 | end: |
8abe313a | 611 | return channel_info; |
ab0ee2ca | 612 | error: |
8abe313a | 613 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
614 | return NULL; |
615 | } | |
616 | ||
f2b3ef9f | 617 | LTTNG_HIDDEN |
505b2d90 JG |
618 | bool notification_client_list_get(struct notification_client_list *list) |
619 | { | |
620 | return urcu_ref_get_unless_zero(&list->ref); | |
621 | } | |
622 | ||
623 | static | |
624 | void free_notification_client_list_rcu(struct rcu_head *node) | |
625 | { | |
626 | free(caa_container_of(node, struct notification_client_list, | |
627 | rcu_node)); | |
628 | } | |
629 | ||
630 | static | |
631 | void notification_client_list_release(struct urcu_ref *list_ref) | |
632 | { | |
633 | struct notification_client_list *list = | |
634 | container_of(list_ref, typeof(*list), ref); | |
635 | struct notification_client_list_element *client_list_element, *tmp; | |
636 | ||
637 | if (list->notification_trigger_clients_ht) { | |
638 | rcu_read_lock(); | |
639 | cds_lfht_del(list->notification_trigger_clients_ht, | |
640 | &list->notification_trigger_clients_ht_node); | |
641 | rcu_read_unlock(); | |
642 | list->notification_trigger_clients_ht = NULL; | |
643 | } | |
644 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
645 | &list->list, node) { | |
646 | free(client_list_element); | |
647 | } | |
648 | pthread_mutex_destroy(&list->lock); | |
649 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
650 | } | |
651 | ||
652 | static | |
653 | struct notification_client_list *notification_client_list_create( | |
654 | const struct lttng_trigger *trigger) | |
655 | { | |
656 | struct notification_client_list *client_list = | |
657 | zmalloc(sizeof(*client_list)); | |
658 | ||
659 | if (!client_list) { | |
660 | goto error; | |
661 | } | |
662 | pthread_mutex_init(&client_list->lock, NULL); | |
663 | urcu_ref_init(&client_list->ref); | |
664 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
665 | CDS_INIT_LIST_HEAD(&client_list->list); | |
666 | client_list->trigger = trigger; | |
667 | error: | |
668 | return client_list; | |
669 | } | |
670 | ||
671 | static | |
672 | void publish_notification_client_list( | |
673 | struct notification_thread_state *state, | |
674 | struct notification_client_list *list) | |
675 | { | |
676 | const struct lttng_condition *condition = | |
677 | lttng_trigger_get_const_condition(list->trigger); | |
678 | ||
679 | assert(!list->notification_trigger_clients_ht); | |
f2b3ef9f | 680 | notification_client_list_get(list); |
505b2d90 JG |
681 | |
682 | list->notification_trigger_clients_ht = | |
683 | state->notification_trigger_clients_ht; | |
684 | ||
685 | rcu_read_lock(); | |
686 | cds_lfht_add(state->notification_trigger_clients_ht, | |
687 | lttng_condition_hash(condition), | |
688 | &list->notification_trigger_clients_ht_node); | |
689 | rcu_read_unlock(); | |
690 | } | |
691 | ||
f2b3ef9f | 692 | LTTNG_HIDDEN |
505b2d90 JG |
693 | void notification_client_list_put(struct notification_client_list *list) |
694 | { | |
695 | if (!list) { | |
696 | return; | |
697 | } | |
698 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
699 | } | |
700 | ||
701 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
702 | static |
703 | struct notification_client_list *get_client_list_from_condition( | |
704 | struct notification_thread_state *state, | |
705 | const struct lttng_condition *condition) | |
706 | { | |
707 | struct cds_lfht_node *node; | |
708 | struct cds_lfht_iter iter; | |
505b2d90 | 709 | struct notification_client_list *list = NULL; |
ed327204 | 710 | |
505b2d90 | 711 | rcu_read_lock(); |
ed327204 JG |
712 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
713 | lttng_condition_hash(condition), | |
714 | match_client_list_condition, | |
715 | condition, | |
716 | &iter); | |
717 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
718 | if (node) { |
719 | list = container_of(node, struct notification_client_list, | |
720 | notification_trigger_clients_ht_node); | |
721 | list = notification_client_list_get(list) ? list : NULL; | |
722 | } | |
ed327204 | 723 | |
505b2d90 JG |
724 | rcu_read_unlock(); |
725 | return list; | |
ed327204 JG |
726 | } |
727 | ||
e4db5ace | 728 | static |
f82f93a1 JG |
729 | int evaluate_channel_condition_for_client( |
730 | const struct lttng_condition *condition, | |
731 | struct notification_thread_state *state, | |
732 | struct lttng_evaluation **evaluation, | |
733 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
734 | { |
735 | int ret; | |
736 | struct cds_lfht_iter iter; | |
737 | struct cds_lfht_node *node; | |
738 | struct channel_info *channel_info = NULL; | |
739 | struct channel_key *channel_key = NULL; | |
740 | struct channel_state_sample *last_sample = NULL; | |
741 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 742 | |
505b2d90 JG |
743 | rcu_read_lock(); |
744 | ||
f82f93a1 | 745 | /* Find the channel associated with the condition. */ |
e4db5ace | 746 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 747 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
748 | struct lttng_trigger_list_element *element; |
749 | ||
750 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 751 | const struct lttng_condition *current_condition = |
f82f93a1 | 752 | lttng_trigger_get_const_condition( |
e4db5ace JR |
753 | element->trigger); |
754 | ||
755 | assert(current_condition); | |
756 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 757 | current_condition)) { |
e4db5ace JR |
758 | continue; |
759 | } | |
760 | ||
761 | /* Found the trigger, save the channel key. */ | |
762 | channel_key = &channel_trigger_list->channel_key; | |
763 | break; | |
764 | } | |
765 | if (channel_key) { | |
766 | /* The channel key was found stop iteration. */ | |
767 | break; | |
768 | } | |
769 | } | |
770 | ||
771 | if (!channel_key){ | |
772 | /* No channel found; normal exit. */ | |
f82f93a1 | 773 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
774 | ret = 0; |
775 | goto end; | |
776 | } | |
777 | ||
778 | /* Fetch channel info for the matching channel. */ | |
779 | cds_lfht_lookup(state->channels_ht, | |
780 | hash_channel_key(channel_key), | |
781 | match_channel_info, | |
782 | channel_key, | |
783 | &iter); | |
784 | node = cds_lfht_iter_get_node(&iter); | |
785 | assert(node); | |
786 | channel_info = caa_container_of(node, struct channel_info, | |
787 | channels_ht_node); | |
788 | ||
789 | /* Retrieve the channel's last sample, if it exists. */ | |
790 | cds_lfht_lookup(state->channel_state_ht, | |
791 | hash_channel_key(channel_key), | |
792 | match_channel_state_sample, | |
793 | channel_key, | |
794 | &iter); | |
795 | node = cds_lfht_iter_get_node(&iter); | |
796 | if (node) { | |
797 | last_sample = caa_container_of(node, | |
798 | struct channel_state_sample, | |
799 | channel_state_ht_node); | |
800 | } else { | |
801 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
802 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
803 | ret = 0; | |
804 | goto end; | |
805 | } | |
806 | ||
f82f93a1 | 807 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
808 | NULL, last_sample, |
809 | 0, channel_info->session_info->consumed_data_size, | |
810 | channel_info); | |
e4db5ace | 811 | if (ret) { |
066a3c82 | 812 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
813 | goto end; |
814 | } | |
815 | ||
f82f93a1 JG |
816 | *session_uid = channel_info->session_info->uid; |
817 | *session_gid = channel_info->session_info->gid; | |
818 | end: | |
505b2d90 | 819 | rcu_read_unlock(); |
f82f93a1 JG |
820 | return ret; |
821 | } | |
822 | ||
823 | static | |
824 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
825 | { | |
826 | const char *session_name = NULL; | |
827 | enum lttng_condition_status status; | |
828 | ||
829 | switch (lttng_condition_get_type(condition)) { | |
830 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
831 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
832 | status = lttng_condition_buffer_usage_get_session_name( | |
833 | condition, &session_name); | |
834 | break; | |
835 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
836 | status = lttng_condition_session_consumed_size_get_session_name( | |
837 | condition, &session_name); | |
838 | break; | |
839 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
840 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
841 | status = lttng_condition_session_rotation_get_session_name( | |
842 | condition, &session_name); | |
843 | break; | |
844 | default: | |
845 | abort(); | |
846 | } | |
847 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
848 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
849 | goto end; | |
850 | } | |
851 | end: | |
852 | return session_name; | |
853 | } | |
854 | ||
f82f93a1 JG |
855 | static |
856 | int evaluate_session_condition_for_client( | |
857 | const struct lttng_condition *condition, | |
858 | struct notification_thread_state *state, | |
859 | struct lttng_evaluation **evaluation, | |
860 | uid_t *session_uid, gid_t *session_gid) | |
861 | { | |
862 | int ret; | |
863 | struct cds_lfht_iter iter; | |
864 | struct cds_lfht_node *node; | |
865 | const char *session_name; | |
866 | struct session_info *session_info = NULL; | |
867 | ||
505b2d90 | 868 | rcu_read_lock(); |
f82f93a1 JG |
869 | session_name = get_condition_session_name(condition); |
870 | ||
871 | /* Find the session associated with the trigger. */ | |
872 | cds_lfht_lookup(state->sessions_ht, | |
873 | hash_key_str(session_name, lttng_ht_seed), | |
874 | match_session, | |
875 | session_name, | |
876 | &iter); | |
877 | node = cds_lfht_iter_get_node(&iter); | |
878 | if (!node) { | |
879 | DBG("[notification-thread] No known session matching name \"%s\"", | |
880 | session_name); | |
881 | ret = 0; | |
882 | goto end; | |
883 | } | |
884 | ||
885 | session_info = caa_container_of(node, struct session_info, | |
886 | sessions_ht_node); | |
887 | session_info_get(session_info); | |
888 | ||
889 | /* | |
890 | * Evaluation is performed in-line here since only one type of | |
891 | * session-bound condition is handled for the moment. | |
892 | */ | |
893 | switch (lttng_condition_get_type(condition)) { | |
894 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
895 | if (!session_info->rotation.ongoing) { | |
be558f88 | 896 | ret = 0; |
f82f93a1 JG |
897 | goto end_session_put; |
898 | } | |
899 | ||
900 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
901 | session_info->rotation.id); | |
902 | if (!*evaluation) { | |
903 | /* Fatal error. */ | |
904 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
905 | session_info->name); | |
906 | ret = -1; | |
907 | goto end_session_put; | |
908 | } | |
909 | ret = 0; | |
910 | break; | |
911 | default: | |
912 | ret = 0; | |
913 | goto end_session_put; | |
914 | } | |
915 | ||
916 | *session_uid = session_info->uid; | |
917 | *session_gid = session_info->gid; | |
918 | ||
919 | end_session_put: | |
920 | session_info_put(session_info); | |
921 | end: | |
505b2d90 | 922 | rcu_read_unlock(); |
f82f93a1 JG |
923 | return ret; |
924 | } | |
925 | ||
f82f93a1 JG |
926 | static |
927 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
928 | const struct lttng_condition *condition, | |
929 | struct notification_client *client, | |
930 | struct notification_thread_state *state) | |
931 | { | |
932 | int ret; | |
933 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
934 | struct notification_client_list client_list = { |
935 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
936 | }; | |
f82f93a1 JG |
937 | struct notification_client_list_element client_list_element = { 0 }; |
938 | uid_t object_uid = 0; | |
939 | gid_t object_gid = 0; | |
940 | ||
941 | assert(trigger); | |
942 | assert(condition); | |
943 | assert(client); | |
944 | assert(state); | |
945 | ||
946 | switch (get_condition_binding_object(condition)) { | |
947 | case LTTNG_OBJECT_TYPE_SESSION: | |
948 | ret = evaluate_session_condition_for_client(condition, state, | |
949 | &evaluation, &object_uid, &object_gid); | |
950 | break; | |
951 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
952 | ret = evaluate_channel_condition_for_client(condition, state, | |
953 | &evaluation, &object_uid, &object_gid); | |
954 | break; | |
955 | case LTTNG_OBJECT_TYPE_NONE: | |
956 | ret = 0; | |
957 | goto end; | |
958 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
959 | default: | |
960 | ret = -1; | |
961 | goto end; | |
962 | } | |
af0c318d JG |
963 | if (ret) { |
964 | /* Fatal error. */ | |
965 | goto end; | |
966 | } | |
e4db5ace JR |
967 | if (!evaluation) { |
968 | /* Evaluation yielded nothing. Normal exit. */ | |
969 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
970 | ret = 0; | |
971 | goto end; | |
972 | } | |
973 | ||
974 | /* | |
975 | * Create a temporary client list with the client currently | |
976 | * subscribing. | |
977 | */ | |
505b2d90 | 978 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
e4db5ace JR |
979 | CDS_INIT_LIST_HEAD(&client_list.list); |
980 | client_list.trigger = trigger; | |
981 | ||
982 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
983 | client_list_element.client = client; | |
984 | cds_list_add(&client_list_element.node, &client_list.list); | |
985 | ||
986 | /* Send evaluation result to the newly-subscribed client. */ | |
987 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
988 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 989 | state, object_uid, object_gid); |
e4db5ace JR |
990 | |
991 | end: | |
992 | return ret; | |
993 | } | |
994 | ||
ab0ee2ca JG |
995 | static |
996 | int notification_thread_client_subscribe(struct notification_client *client, | |
997 | struct lttng_condition *condition, | |
998 | struct notification_thread_state *state, | |
999 | enum lttng_notification_channel_status *_status) | |
1000 | { | |
1001 | int ret = 0; | |
505b2d90 | 1002 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1003 | struct lttng_condition_list_element *condition_list_element = NULL; |
1004 | struct notification_client_list_element *client_list_element = NULL; | |
1005 | enum lttng_notification_channel_status status = | |
1006 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1007 | ||
1008 | /* | |
1009 | * Ensure that the client has not already subscribed to this condition | |
1010 | * before. | |
1011 | */ | |
1012 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1013 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1014 | condition)) { | |
1015 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1016 | goto end; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1021 | if (!condition_list_element) { | |
1022 | ret = -1; | |
1023 | goto error; | |
1024 | } | |
1025 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1026 | if (!client_list_element) { | |
1027 | ret = -1; | |
1028 | goto error; | |
1029 | } | |
1030 | ||
ab0ee2ca JG |
1031 | /* |
1032 | * Add the newly-subscribed condition to the client's subscription list. | |
1033 | */ | |
1034 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1035 | condition_list_element->condition = condition; | |
1036 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
1037 | ||
ed327204 JG |
1038 | client_list = get_client_list_from_condition(state, condition); |
1039 | if (!client_list) { | |
2ae99f0b JG |
1040 | /* |
1041 | * No notification-emiting trigger registered with this | |
1042 | * condition. We don't evaluate the condition right away | |
1043 | * since this trigger is not registered yet. | |
1044 | */ | |
4fb43b68 | 1045 | free(client_list_element); |
505b2d90 | 1046 | goto end; |
ab0ee2ca JG |
1047 | } |
1048 | ||
2ae99f0b JG |
1049 | /* |
1050 | * The condition to which the client just subscribed is evaluated | |
1051 | * at this point so that conditions that are already TRUE result | |
1052 | * in a notification being sent out. | |
505b2d90 JG |
1053 | * |
1054 | * The client_list's trigger is used without locking the list itself. | |
1055 | * This is correct since the list doesn't own the trigger and the | |
1056 | * object is immutable. | |
2ae99f0b | 1057 | */ |
e4db5ace JR |
1058 | if (evaluate_condition_for_client(client_list->trigger, condition, |
1059 | client, state)) { | |
1060 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1061 | ret = -1; | |
4bd5b4af | 1062 | free(client_list_element); |
505b2d90 | 1063 | goto end; |
e4db5ace JR |
1064 | } |
1065 | ||
1066 | /* | |
1067 | * Add the client to the list of clients interested in a given trigger | |
1068 | * if a "notification" trigger with a corresponding condition was | |
1069 | * added prior. | |
1070 | */ | |
ab0ee2ca JG |
1071 | client_list_element->client = client; |
1072 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1073 | |
1074 | pthread_mutex_lock(&client_list->lock); | |
ab0ee2ca | 1075 | cds_list_add(&client_list_element->node, &client_list->list); |
505b2d90 | 1076 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1077 | end: |
1078 | if (_status) { | |
1079 | *_status = status; | |
1080 | } | |
505b2d90 JG |
1081 | if (client_list) { |
1082 | notification_client_list_put(client_list); | |
1083 | } | |
ab0ee2ca JG |
1084 | return ret; |
1085 | error: | |
1086 | free(condition_list_element); | |
1087 | free(client_list_element); | |
1088 | return ret; | |
1089 | } | |
1090 | ||
1091 | static | |
1092 | int notification_thread_client_unsubscribe( | |
1093 | struct notification_client *client, | |
1094 | struct lttng_condition *condition, | |
1095 | struct notification_thread_state *state, | |
1096 | enum lttng_notification_channel_status *_status) | |
1097 | { | |
ab0ee2ca JG |
1098 | struct notification_client_list *client_list; |
1099 | struct lttng_condition_list_element *condition_list_element, | |
1100 | *condition_tmp; | |
1101 | struct notification_client_list_element *client_list_element, | |
1102 | *client_tmp; | |
1103 | bool condition_found = false; | |
1104 | enum lttng_notification_channel_status status = | |
1105 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1106 | ||
1107 | /* Remove the condition from the client's condition list. */ | |
1108 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1109 | &client->condition_list, node) { | |
1110 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1111 | condition)) { | |
1112 | continue; | |
1113 | } | |
1114 | ||
1115 | cds_list_del(&condition_list_element->node); | |
1116 | /* | |
1117 | * The caller may be iterating on the client's conditions to | |
1118 | * tear down a client's connection. In this case, the condition | |
1119 | * will be destroyed at the end. | |
1120 | */ | |
1121 | if (condition != condition_list_element->condition) { | |
1122 | lttng_condition_destroy( | |
1123 | condition_list_element->condition); | |
1124 | } | |
1125 | free(condition_list_element); | |
1126 | condition_found = true; | |
1127 | break; | |
1128 | } | |
1129 | ||
1130 | if (!condition_found) { | |
1131 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1132 | goto end; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Remove the client from the list of clients interested the trigger | |
1137 | * matching the condition. | |
1138 | */ | |
ed327204 JG |
1139 | client_list = get_client_list_from_condition(state, condition); |
1140 | if (!client_list) { | |
505b2d90 | 1141 | goto end; |
ab0ee2ca JG |
1142 | } |
1143 | ||
505b2d90 | 1144 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
1145 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
1146 | &client_list->list, node) { | |
505b2d90 | 1147 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1148 | continue; |
1149 | } | |
1150 | cds_list_del(&client_list_element->node); | |
1151 | free(client_list_element); | |
1152 | break; | |
1153 | } | |
505b2d90 JG |
1154 | pthread_mutex_unlock(&client_list->lock); |
1155 | notification_client_list_put(client_list); | |
1156 | client_list = NULL; | |
ab0ee2ca JG |
1157 | end: |
1158 | lttng_condition_destroy(condition); | |
1159 | if (_status) { | |
1160 | *_status = status; | |
1161 | } | |
1162 | return 0; | |
1163 | } | |
1164 | ||
83b934ad MD |
1165 | static |
1166 | void free_notification_client_rcu(struct rcu_head *node) | |
1167 | { | |
1168 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1169 | } | |
1170 | ||
ab0ee2ca JG |
1171 | static |
1172 | void notification_client_destroy(struct notification_client *client, | |
1173 | struct notification_thread_state *state) | |
1174 | { | |
ab0ee2ca JG |
1175 | if (!client) { |
1176 | return; | |
1177 | } | |
1178 | ||
505b2d90 JG |
1179 | /* |
1180 | * The client object is not reachable by other threads, no need to lock | |
1181 | * the client here. | |
1182 | */ | |
ab0ee2ca JG |
1183 | if (client->socket >= 0) { |
1184 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1185 | client->socket = -1; |
ab0ee2ca | 1186 | } |
505b2d90 | 1187 | client->communication.active = false; |
882093ee JR |
1188 | lttng_payload_reset(&client->communication.inbound.payload); |
1189 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1190 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1191 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1192 | } |
1193 | ||
1194 | /* | |
1195 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1196 | * client pointer). | |
1197 | */ | |
1198 | static | |
1199 | struct notification_client *get_client_from_socket(int socket, | |
1200 | struct notification_thread_state *state) | |
1201 | { | |
1202 | struct cds_lfht_iter iter; | |
1203 | struct cds_lfht_node *node; | |
1204 | struct notification_client *client = NULL; | |
1205 | ||
1206 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1207 | hash_client_socket(socket), |
1208 | match_client_socket, | |
ab0ee2ca JG |
1209 | (void *) (unsigned long) socket, |
1210 | &iter); | |
1211 | node = cds_lfht_iter_get_node(&iter); | |
1212 | if (!node) { | |
1213 | goto end; | |
1214 | } | |
1215 | ||
1216 | client = caa_container_of(node, struct notification_client, | |
1217 | client_socket_ht_node); | |
1218 | end: | |
1219 | return client; | |
1220 | } | |
1221 | ||
f2b3ef9f JG |
1222 | /* |
1223 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1224 | * client pointer). | |
1225 | */ | |
1226 | static | |
1227 | struct notification_client *get_client_from_id(notification_client_id id, | |
1228 | struct notification_thread_state *state) | |
1229 | { | |
1230 | struct cds_lfht_iter iter; | |
1231 | struct cds_lfht_node *node; | |
1232 | struct notification_client *client = NULL; | |
1233 | ||
1234 | cds_lfht_lookup(state->client_id_ht, | |
1235 | hash_client_id(id), | |
1236 | match_client_id, | |
1237 | &id, | |
1238 | &iter); | |
1239 | node = cds_lfht_iter_get_node(&iter); | |
1240 | if (!node) { | |
1241 | goto end; | |
1242 | } | |
1243 | ||
1244 | client = caa_container_of(node, struct notification_client, | |
1245 | client_id_ht_node); | |
1246 | end: | |
1247 | return client; | |
1248 | } | |
1249 | ||
ab0ee2ca | 1250 | static |
e8360425 | 1251 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1252 | const struct lttng_condition *condition, |
1253 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1254 | { |
1255 | enum lttng_condition_status status; | |
e8360425 JD |
1256 | enum lttng_domain_type condition_domain; |
1257 | const char *condition_session_name = NULL; | |
1258 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1259 | |
e8360425 JD |
1260 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1261 | &condition_domain); | |
1262 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1263 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1264 | goto fail; |
1265 | } | |
1266 | ||
e8360425 JD |
1267 | status = lttng_condition_buffer_usage_get_session_name( |
1268 | condition, &condition_session_name); | |
1269 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1270 | ||
1271 | status = lttng_condition_buffer_usage_get_channel_name( | |
1272 | condition, &condition_channel_name); | |
1273 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1274 | ||
1275 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1276 | goto fail; | |
1277 | } | |
1278 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1279 | goto fail; |
1280 | } | |
1281 | ||
e8360425 JD |
1282 | return true; |
1283 | fail: | |
1284 | return false; | |
1285 | } | |
1286 | ||
1287 | static | |
1288 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1289 | const struct lttng_condition *condition, |
1290 | const struct channel_info *channel_info) | |
e8360425 JD |
1291 | { |
1292 | enum lttng_condition_status status; | |
1293 | const char *condition_session_name = NULL; | |
1294 | ||
1295 | status = lttng_condition_session_consumed_size_get_session_name( | |
1296 | condition, &condition_session_name); | |
1297 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1298 | ||
1299 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1300 | goto fail; |
1301 | } | |
1302 | ||
e8360425 JD |
1303 | return true; |
1304 | fail: | |
1305 | return false; | |
1306 | } | |
ab0ee2ca | 1307 | |
51eab943 JG |
1308 | static |
1309 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1310 | const struct channel_info *channel_info) | |
1311 | { | |
1312 | const struct lttng_condition *condition; | |
e8360425 | 1313 | bool trigger_applies; |
ab0ee2ca | 1314 | |
51eab943 | 1315 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1316 | if (!condition) { |
ab0ee2ca JG |
1317 | goto fail; |
1318 | } | |
e8360425 JD |
1319 | |
1320 | switch (lttng_condition_get_type(condition)) { | |
1321 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1322 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1323 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1324 | condition, channel_info); | |
1325 | break; | |
1326 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1327 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1328 | condition, channel_info); | |
1329 | break; | |
1330 | default: | |
ab0ee2ca JG |
1331 | goto fail; |
1332 | } | |
1333 | ||
e8360425 | 1334 | return trigger_applies; |
ab0ee2ca JG |
1335 | fail: |
1336 | return false; | |
1337 | } | |
1338 | ||
1339 | static | |
1340 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1341 | struct notification_client *client) | |
1342 | { | |
1343 | bool applies = false; | |
1344 | struct lttng_condition_list_element *condition_list_element; | |
1345 | ||
1346 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1347 | node) { | |
1348 | applies = lttng_condition_is_equal( | |
1349 | condition_list_element->condition, | |
1350 | lttng_trigger_get_condition(trigger)); | |
1351 | if (applies) { | |
1352 | break; | |
1353 | } | |
1354 | } | |
1355 | return applies; | |
1356 | } | |
1357 | ||
ed327204 JG |
1358 | /* Must be called with RCU read lock held. */ |
1359 | static | |
1360 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1361 | struct notification_thread_state *state, | |
1362 | const char *session_name) | |
1363 | { | |
1364 | struct lttng_session_trigger_list *list = NULL; | |
1365 | struct cds_lfht_node *node; | |
1366 | struct cds_lfht_iter iter; | |
1367 | ||
1368 | cds_lfht_lookup(state->session_triggers_ht, | |
1369 | hash_key_str(session_name, lttng_ht_seed), | |
1370 | match_session_trigger_list, | |
1371 | session_name, | |
1372 | &iter); | |
1373 | node = cds_lfht_iter_get_node(&iter); | |
1374 | if (!node) { | |
1375 | /* | |
1376 | * Not an error, the list of triggers applying to that session | |
1377 | * will be initialized when the session is created. | |
1378 | */ | |
1379 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1380 | session_name); | |
1381 | goto end; | |
1382 | } | |
1383 | ||
e742b055 | 1384 | list = caa_container_of(node, |
ed327204 JG |
1385 | struct lttng_session_trigger_list, |
1386 | session_triggers_ht_node); | |
1387 | end: | |
1388 | return list; | |
1389 | } | |
1390 | ||
ea9a44f0 JG |
1391 | /* |
1392 | * Allocate an empty lttng_session_trigger_list for the session named | |
1393 | * 'session_name'. | |
1394 | * | |
1395 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1396 | * It is the caller's responsability to ensure the session name is alive | |
1397 | * for as long as this list is. | |
1398 | */ | |
1399 | static | |
1400 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1401 | const char *session_name, | |
1402 | struct cds_lfht *session_triggers_ht) | |
1403 | { | |
1404 | struct lttng_session_trigger_list *list; | |
1405 | ||
1406 | list = zmalloc(sizeof(*list)); | |
1407 | if (!list) { | |
1408 | goto end; | |
1409 | } | |
1410 | list->session_name = session_name; | |
1411 | CDS_INIT_LIST_HEAD(&list->list); | |
1412 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1413 | list->session_triggers_ht = session_triggers_ht; | |
1414 | ||
1415 | rcu_read_lock(); | |
1416 | /* Publish the list through the session_triggers_ht. */ | |
1417 | cds_lfht_add(session_triggers_ht, | |
1418 | hash_key_str(session_name, lttng_ht_seed), | |
1419 | &list->session_triggers_ht_node); | |
1420 | rcu_read_unlock(); | |
1421 | end: | |
1422 | return list; | |
1423 | } | |
1424 | ||
1425 | static | |
1426 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1427 | { | |
1428 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1429 | rcu_node)); | |
1430 | } | |
1431 | ||
1432 | static | |
1433 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1434 | { | |
1435 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1436 | ||
1437 | /* Empty the list element by element, and then free the list itself. */ | |
1438 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1439 | &list->list, node) { | |
1440 | cds_list_del(&trigger_list_element->node); | |
1441 | free(trigger_list_element); | |
1442 | } | |
1443 | rcu_read_lock(); | |
1444 | /* Unpublish the list from the session_triggers_ht. */ | |
1445 | cds_lfht_del(list->session_triggers_ht, | |
1446 | &list->session_triggers_ht_node); | |
1447 | rcu_read_unlock(); | |
1448 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1449 | } | |
1450 | ||
1451 | static | |
1452 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1453 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1454 | { |
1455 | int ret = 0; | |
1456 | struct lttng_trigger_list_element *new_element = | |
1457 | zmalloc(sizeof(*new_element)); | |
1458 | ||
1459 | if (!new_element) { | |
1460 | ret = -1; | |
1461 | goto end; | |
1462 | } | |
1463 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1464 | new_element->trigger = trigger; | |
1465 | cds_list_add(&new_element->node, &list->list); | |
1466 | end: | |
1467 | return ret; | |
1468 | } | |
1469 | ||
1470 | static | |
1471 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1472 | const char *session_name) | |
1473 | { | |
1474 | bool applies = false; | |
1475 | const struct lttng_condition *condition; | |
1476 | ||
1477 | condition = lttng_trigger_get_const_condition(trigger); | |
1478 | switch (lttng_condition_get_type(condition)) { | |
1479 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1480 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1481 | { | |
1482 | enum lttng_condition_status condition_status; | |
1483 | const char *condition_session_name; | |
1484 | ||
1485 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1486 | condition, &condition_session_name); | |
1487 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1488 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1489 | goto end; | |
1490 | } | |
1491 | ||
1492 | assert(condition_session_name); | |
1493 | applies = !strcmp(condition_session_name, session_name); | |
1494 | break; | |
1495 | } | |
1496 | default: | |
1497 | goto end; | |
1498 | } | |
1499 | end: | |
1500 | return applies; | |
1501 | } | |
1502 | ||
1503 | /* | |
1504 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1505 | * all triggers that apply to the session named 'session_name'. | |
1506 | * | |
1507 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1508 | * It is the caller's responsability to ensure the session name is alive | |
1509 | * for as long as this list is. | |
1510 | */ | |
1511 | static | |
1512 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1513 | const struct notification_thread_state *state, | |
1514 | const char *session_name) | |
1515 | { | |
1516 | int trigger_count = 0; | |
1517 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1518 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1519 | struct cds_lfht_iter iter; | |
1520 | ||
1521 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1522 | state->session_triggers_ht); | |
1523 | ||
1524 | /* Add all triggers applying to the session named 'session_name'. */ | |
1525 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1526 | node) { | |
1527 | int ret; | |
1528 | ||
1529 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1530 | session_name)) { | |
1531 | continue; | |
1532 | } | |
1533 | ||
1534 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1535 | trigger_ht_element->trigger); | |
1536 | if (ret) { | |
1537 | goto error; | |
1538 | } | |
1539 | ||
1540 | trigger_count++; | |
1541 | } | |
1542 | ||
1543 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1544 | trigger_count); | |
1545 | return session_trigger_list; | |
1546 | error: | |
1547 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1548 | return NULL; | |
1549 | } | |
1550 | ||
8abe313a JG |
1551 | static |
1552 | struct session_info *find_or_create_session_info( | |
1553 | struct notification_thread_state *state, | |
1554 | const char *name, uid_t uid, gid_t gid) | |
1555 | { | |
1556 | struct session_info *session = NULL; | |
1557 | struct cds_lfht_node *node; | |
1558 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1559 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1560 | |
1561 | rcu_read_lock(); | |
1562 | cds_lfht_lookup(state->sessions_ht, | |
1563 | hash_key_str(name, lttng_ht_seed), | |
1564 | match_session, | |
1565 | name, | |
1566 | &iter); | |
1567 | node = cds_lfht_iter_get_node(&iter); | |
1568 | if (node) { | |
1569 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1570 | name, uid, gid); | |
1571 | session = caa_container_of(node, struct session_info, | |
1572 | sessions_ht_node); | |
1573 | assert(session->uid == uid); | |
1574 | assert(session->gid == gid); | |
1eee26c5 JG |
1575 | session_info_get(session); |
1576 | goto end; | |
ea9a44f0 JG |
1577 | } |
1578 | ||
1579 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1580 | if (!trigger_list) { | |
1581 | goto error; | |
8abe313a JG |
1582 | } |
1583 | ||
1eee26c5 JG |
1584 | session = session_info_create(name, uid, gid, trigger_list, |
1585 | state->sessions_ht); | |
8abe313a JG |
1586 | if (!session) { |
1587 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1588 | name, uid, gid); | |
b248644d | 1589 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1590 | goto error; |
8abe313a | 1591 | } |
ea9a44f0 | 1592 | trigger_list = NULL; |
577983cb JG |
1593 | |
1594 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1595 | &session->sessions_ht_node); |
1eee26c5 | 1596 | end: |
8abe313a JG |
1597 | rcu_read_unlock(); |
1598 | return session; | |
ea9a44f0 JG |
1599 | error: |
1600 | rcu_read_unlock(); | |
1601 | session_info_put(session); | |
1602 | return NULL; | |
8abe313a JG |
1603 | } |
1604 | ||
ab0ee2ca JG |
1605 | static |
1606 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1607 | struct notification_thread_state *state, |
1608 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1609 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1610 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1611 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1612 | { |
1613 | struct cds_list_head trigger_list; | |
8abe313a JG |
1614 | struct channel_info *new_channel_info = NULL; |
1615 | struct channel_key channel_key = { | |
1616 | .key = channel_key_int, | |
1617 | .domain = channel_domain, | |
1618 | }; | |
ab0ee2ca JG |
1619 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1620 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1621 | int trigger_count = 0; | |
1622 | struct cds_lfht_iter iter; | |
8abe313a | 1623 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1624 | |
1625 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a JG |
1626 | channel_name, session_name, channel_key_int, |
1627 | channel_domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
ab0ee2ca JG |
1628 | |
1629 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1630 | ||
8abe313a JG |
1631 | session_info = find_or_create_session_info(state, session_name, |
1632 | session_uid, session_gid); | |
1633 | if (!session_info) { | |
a9577b76 | 1634 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1635 | goto error; |
1636 | } | |
1637 | ||
8abe313a JG |
1638 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1639 | channel_capacity, session_info); | |
1640 | if (!new_channel_info) { | |
1641 | goto error; | |
1642 | } | |
ab0ee2ca | 1643 | |
83b934ad | 1644 | rcu_read_lock(); |
ab0ee2ca JG |
1645 | /* Build a list of all triggers applying to the new channel. */ |
1646 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1647 | node) { | |
1648 | struct lttng_trigger_list_element *new_element; | |
1649 | ||
1650 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1651 | new_channel_info)) { |
ab0ee2ca JG |
1652 | continue; |
1653 | } | |
1654 | ||
1655 | new_element = zmalloc(sizeof(*new_element)); | |
1656 | if (!new_element) { | |
83b934ad | 1657 | rcu_read_unlock(); |
ab0ee2ca JG |
1658 | goto error; |
1659 | } | |
1660 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1661 | new_element->trigger = trigger_ht_element->trigger; | |
1662 | cds_list_add(&new_element->node, &trigger_list); | |
1663 | trigger_count++; | |
1664 | } | |
83b934ad | 1665 | rcu_read_unlock(); |
ab0ee2ca JG |
1666 | |
1667 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1668 | trigger_count); | |
1669 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1670 | if (!channel_trigger_list) { | |
1671 | goto error; | |
1672 | } | |
8abe313a | 1673 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1674 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1675 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1676 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1677 | ||
1678 | rcu_read_lock(); | |
1679 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1680 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1681 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1682 | &new_channel_info->channels_ht_node); |
1683 | /* | |
1684 | * Add the list of triggers associated with this channel to the | |
1685 | * channel_triggers_ht. | |
1686 | */ | |
1687 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1688 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1689 | &channel_trigger_list->channel_triggers_ht_node); |
1690 | rcu_read_unlock(); | |
1eee26c5 | 1691 | session_info_put(session_info); |
ab0ee2ca JG |
1692 | *cmd_result = LTTNG_OK; |
1693 | return 0; | |
1694 | error: | |
ab0ee2ca | 1695 | channel_info_destroy(new_channel_info); |
8abe313a | 1696 | session_info_put(session_info); |
ab0ee2ca JG |
1697 | return 1; |
1698 | } | |
1699 | ||
83b934ad MD |
1700 | static |
1701 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1702 | { | |
1703 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1704 | rcu_node)); | |
1705 | } | |
1706 | ||
1707 | static | |
1708 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1709 | { | |
1710 | free(caa_container_of(node, struct channel_state_sample, | |
1711 | rcu_node)); | |
1712 | } | |
1713 | ||
ab0ee2ca JG |
1714 | static |
1715 | int handle_notification_thread_command_remove_channel( | |
1716 | struct notification_thread_state *state, | |
1717 | uint64_t channel_key, enum lttng_domain_type domain, | |
1718 | enum lttng_error_code *cmd_result) | |
1719 | { | |
1720 | struct cds_lfht_node *node; | |
1721 | struct cds_lfht_iter iter; | |
1722 | struct lttng_channel_trigger_list *trigger_list; | |
1723 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1724 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1725 | struct channel_info *channel_info; | |
1726 | ||
1727 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
1728 | channel_key, domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
1729 | ||
1730 | rcu_read_lock(); | |
1731 | ||
1732 | cds_lfht_lookup(state->channel_triggers_ht, | |
1733 | hash_channel_key(&key), | |
1734 | match_channel_trigger_list, | |
1735 | &key, | |
1736 | &iter); | |
1737 | node = cds_lfht_iter_get_node(&iter); | |
1738 | /* | |
1739 | * There is a severe internal error if we are being asked to remove a | |
1740 | * channel that doesn't exist. | |
1741 | */ | |
1742 | if (!node) { | |
1743 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1744 | goto end; | |
1745 | } | |
1746 | ||
1747 | /* Free the list of triggers associated with this channel. */ | |
1748 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1749 | channel_triggers_ht_node); | |
1750 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1751 | &trigger_list->list, node) { | |
1752 | cds_list_del(&trigger_list_element->node); | |
1753 | free(trigger_list_element); | |
1754 | } | |
1755 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1756 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1757 | |
1758 | /* Free sampled channel state. */ | |
1759 | cds_lfht_lookup(state->channel_state_ht, | |
1760 | hash_channel_key(&key), | |
1761 | match_channel_state_sample, | |
1762 | &key, | |
1763 | &iter); | |
1764 | node = cds_lfht_iter_get_node(&iter); | |
1765 | /* | |
1766 | * This is expected to be NULL if the channel is destroyed before we | |
1767 | * received a sample. | |
1768 | */ | |
1769 | if (node) { | |
1770 | struct channel_state_sample *sample = caa_container_of(node, | |
1771 | struct channel_state_sample, | |
1772 | channel_state_ht_node); | |
1773 | ||
1774 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1775 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1776 | } |
1777 | ||
1778 | /* Remove the channel from the channels_ht and free it. */ | |
1779 | cds_lfht_lookup(state->channels_ht, | |
1780 | hash_channel_key(&key), | |
1781 | match_channel_info, | |
1782 | &key, | |
1783 | &iter); | |
1784 | node = cds_lfht_iter_get_node(&iter); | |
1785 | assert(node); | |
1786 | channel_info = caa_container_of(node, struct channel_info, | |
1787 | channels_ht_node); | |
1788 | cds_lfht_del(state->channels_ht, node); | |
1789 | channel_info_destroy(channel_info); | |
1790 | end: | |
1791 | rcu_read_unlock(); | |
1792 | *cmd_result = LTTNG_OK; | |
1793 | return 0; | |
1794 | } | |
1795 | ||
0ca52944 | 1796 | static |
ed327204 | 1797 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1798 | struct notification_thread_state *state, |
ed327204 JG |
1799 | enum notification_thread_command_type cmd_type, |
1800 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1801 | uint64_t trace_archive_chunk_id, | |
1802 | struct lttng_trace_archive_location *location, | |
1803 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1804 | { |
ed327204 JG |
1805 | int ret = 0; |
1806 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1807 | struct lttng_session_trigger_list *trigger_list; | |
1808 | struct lttng_trigger_list_element *trigger_list_element; | |
1809 | struct session_info *session_info; | |
f2b3ef9f | 1810 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1811 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1812 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1813 | }; |
0ca52944 | 1814 | |
ed327204 JG |
1815 | rcu_read_lock(); |
1816 | ||
1817 | session_info = find_or_create_session_info(state, session_name, | |
1818 | session_uid, session_gid); | |
1819 | if (!session_info) { | |
a9577b76 | 1820 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1821 | ret = -1; |
1822 | cmd_result = LTTNG_ERR_NOMEM; | |
1823 | goto end; | |
1824 | } | |
1825 | ||
1826 | session_info->rotation.ongoing = | |
1827 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1828 | session_info->rotation.id = trace_archive_chunk_id; | |
1829 | trigger_list = get_session_trigger_list(state, session_name); | |
1830 | if (!trigger_list) { | |
1831 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1832 | session_name); | |
1833 | goto end; | |
1834 | } | |
1835 | ||
1836 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1837 | node) { | |
1838 | const struct lttng_condition *condition; | |
f2b3ef9f | 1839 | struct lttng_trigger *trigger; |
ed327204 JG |
1840 | struct notification_client_list *client_list; |
1841 | struct lttng_evaluation *evaluation = NULL; | |
1842 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1843 | enum action_executor_status executor_status; |
ed327204 JG |
1844 | |
1845 | trigger = trigger_list_element->trigger; | |
1846 | condition = lttng_trigger_get_const_condition(trigger); | |
1847 | assert(condition); | |
1848 | condition_type = lttng_condition_get_type(condition); | |
1849 | ||
1850 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1851 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1852 | continue; | |
1853 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1854 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1855 | continue; | |
1856 | } | |
1857 | ||
ed327204 | 1858 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1859 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1860 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1861 | trace_archive_chunk_id); | |
1862 | } else { | |
1863 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1864 | trace_archive_chunk_id, location); | |
1865 | } | |
1866 | ||
1867 | if (!evaluation) { | |
1868 | /* Internal error */ | |
1869 | ret = -1; | |
1870 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1871 | goto put_list; |
ed327204 JG |
1872 | } |
1873 | ||
f2b3ef9f JG |
1874 | /* |
1875 | * Ownership of `evaluation` transferred to the action executor | |
1876 | * no matter the result. | |
1877 | */ | |
1878 | executor_status = action_executor_enqueue(state->executor, | |
1879 | trigger, evaluation, &session_creds, | |
1880 | client_list); | |
1881 | evaluation = NULL; | |
1882 | switch (executor_status) { | |
1883 | case ACTION_EXECUTOR_STATUS_OK: | |
1884 | break; | |
1885 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1886 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1887 | /* | |
1888 | * TODO Add trigger identification (name/id) when | |
1889 | * it is added to the API. | |
1890 | */ | |
1891 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1892 | ret = -1; | |
1893 | goto put_list; | |
1894 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1895 | /* | |
1896 | * TODO Add trigger identification (name/id) when | |
1897 | * it is added to the API. | |
1898 | * | |
1899 | * Not a fatal error. | |
1900 | */ | |
1901 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1902 | ret = 0; | |
1903 | goto put_list; | |
1904 | default: | |
1905 | abort(); | |
1906 | } | |
1907 | ||
505b2d90 JG |
1908 | put_list: |
1909 | notification_client_list_put(client_list); | |
ed327204 | 1910 | if (caa_unlikely(ret)) { |
505b2d90 | 1911 | break; |
ed327204 JG |
1912 | } |
1913 | } | |
1914 | end: | |
1915 | session_info_put(session_info); | |
1916 | *_cmd_result = cmd_result; | |
1917 | rcu_read_unlock(); | |
1918 | return ret; | |
0ca52944 JG |
1919 | } |
1920 | ||
1da26331 JG |
1921 | static |
1922 | int condition_is_supported(struct lttng_condition *condition) | |
1923 | { | |
1924 | int ret; | |
1925 | ||
1926 | switch (lttng_condition_get_type(condition)) { | |
1927 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1928 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1929 | { | |
1930 | enum lttng_domain_type domain; | |
1931 | ||
1932 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
1933 | &domain); | |
1934 | if (ret) { | |
1935 | ret = -1; | |
1936 | goto end; | |
1937 | } | |
1938 | ||
1939 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
1940 | ret = 1; | |
1941 | goto end; | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Older kernel tracers don't expose the API to monitor their | |
1946 | * buffers. Therefore, we reject triggers that require that | |
1947 | * mechanism to be available to be evaluated. | |
1948 | */ | |
7d268848 | 1949 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); |
1da26331 JG |
1950 | break; |
1951 | } | |
1952 | default: | |
1953 | ret = 1; | |
1954 | } | |
1955 | end: | |
1956 | return ret; | |
1957 | } | |
1958 | ||
51eab943 JG |
1959 | /* Must be called with RCU read lock held. */ |
1960 | static | |
f2b3ef9f | 1961 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
1962 | struct notification_thread_state *state) |
1963 | { | |
1964 | int ret = 0; | |
51eab943 JG |
1965 | const struct lttng_condition *condition; |
1966 | const char *session_name; | |
1967 | struct lttng_session_trigger_list *trigger_list; | |
1968 | ||
1969 | condition = lttng_trigger_get_const_condition(trigger); | |
1970 | switch (lttng_condition_get_type(condition)) { | |
1971 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1972 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1973 | { | |
1974 | enum lttng_condition_status status; | |
1975 | ||
1976 | status = lttng_condition_session_rotation_get_session_name( | |
1977 | condition, &session_name); | |
1978 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
1979 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
1980 | ret = -1; | |
1981 | goto end; | |
1982 | } | |
1983 | break; | |
1984 | } | |
1985 | default: | |
1986 | ret = -1; | |
1987 | goto end; | |
1988 | } | |
1989 | ||
ed327204 JG |
1990 | trigger_list = get_session_trigger_list(state, session_name); |
1991 | if (!trigger_list) { | |
51eab943 JG |
1992 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
1993 | session_name); | |
1994 | goto end; | |
51eab943 | 1995 | |
ed327204 | 1996 | } |
51eab943 JG |
1997 | |
1998 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
1999 | session_name); | |
2000 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2001 | end: | |
2002 | return ret; | |
2003 | } | |
2004 | ||
2005 | /* Must be called with RCU read lock held. */ | |
2006 | static | |
f2b3ef9f | 2007 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2008 | struct notification_thread_state *state) |
2009 | { | |
2010 | int ret = 0; | |
2011 | struct cds_lfht_node *node; | |
2012 | struct cds_lfht_iter iter; | |
2013 | struct channel_info *channel; | |
2014 | ||
2015 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2016 | channels_ht_node) { | |
2017 | struct lttng_trigger_list_element *trigger_list_element; | |
2018 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2019 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2020 | |
2021 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2022 | continue; | |
2023 | } | |
2024 | ||
2025 | cds_lfht_lookup(state->channel_triggers_ht, | |
2026 | hash_channel_key(&channel->key), | |
2027 | match_channel_trigger_list, | |
2028 | &channel->key, | |
a5d64ae7 MD |
2029 | &lookup_iter); |
2030 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2031 | assert(node); |
2032 | trigger_list = caa_container_of(node, | |
2033 | struct lttng_channel_trigger_list, | |
2034 | channel_triggers_ht_node); | |
2035 | ||
2036 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2037 | if (!trigger_list_element) { | |
2038 | ret = -1; | |
2039 | goto end; | |
2040 | } | |
2041 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2042 | trigger_list_element->trigger = trigger; | |
2043 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2044 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2045 | channel->name); | |
2046 | } | |
2047 | end: | |
2048 | return ret; | |
2049 | } | |
2050 | ||
f2b3ef9f JG |
2051 | static |
2052 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2053 | { | |
2054 | bool is_notify = false; | |
2055 | unsigned int i, count; | |
2056 | enum lttng_action_status action_status; | |
2057 | const struct lttng_action *action = | |
2058 | lttng_trigger_get_const_action(trigger); | |
2059 | enum lttng_action_type action_type; | |
2060 | ||
2061 | assert(action); | |
17182cfd | 2062 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2063 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2064 | is_notify = true; | |
2065 | goto end; | |
2066 | } else if (action_type != LTTNG_ACTION_TYPE_GROUP) { | |
2067 | goto end; | |
2068 | } | |
2069 | ||
2070 | action_status = lttng_action_group_get_count(action, &count); | |
2071 | assert(action_status == LTTNG_ACTION_STATUS_OK); | |
2072 | ||
2073 | for (i = 0; i < count; i++) { | |
2074 | const struct lttng_action *inner_action = | |
2075 | lttng_action_group_get_at_index( | |
2076 | action, i); | |
2077 | ||
17182cfd | 2078 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2079 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2080 | is_notify = true; | |
2081 | goto end; | |
2082 | } | |
2083 | } | |
2084 | ||
2085 | end: | |
2086 | return is_notify; | |
2087 | } | |
2088 | ||
ab0ee2ca | 2089 | /* |
f2b3ef9f | 2090 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2091 | * |
1da26331 | 2092 | * The effects of this are benign since: |
ab0ee2ca | 2093 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2094 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2095 | * - The notifications will not be sent since the client's credentials |
2096 | * are checked against the channel at that moment. | |
1da26331 JG |
2097 | * |
2098 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2099 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2100 | * |
2101 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2102 | * error code. | |
ab0ee2ca JG |
2103 | */ |
2104 | static | |
2105 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2106 | struct notification_thread_state *state, |
2107 | struct lttng_trigger *trigger, | |
2108 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
2109 | { |
2110 | int ret = 0; | |
2111 | struct lttng_condition *condition; | |
2112 | struct notification_client *client; | |
2113 | struct notification_client_list *client_list = NULL; | |
2114 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
f2b3ef9f | 2115 | struct notification_client_list_element *client_list_element; |
ab0ee2ca JG |
2116 | struct cds_lfht_node *node; |
2117 | struct cds_lfht_iter iter; | |
ab0ee2ca | 2118 | bool free_trigger = true; |
f2b3ef9f JG |
2119 | struct lttng_evaluation *evaluation = NULL; |
2120 | struct lttng_credentials object_creds; | |
ff588497 JR |
2121 | uid_t object_uid; |
2122 | gid_t object_gid; | |
f2b3ef9f | 2123 | enum action_executor_status executor_status; |
ab0ee2ca JG |
2124 | |
2125 | rcu_read_lock(); | |
2126 | ||
2127 | condition = lttng_trigger_get_condition(trigger); | |
1da26331 JG |
2128 | assert(condition); |
2129 | ||
2130 | ret = condition_is_supported(condition); | |
2131 | if (ret < 0) { | |
2132 | goto error; | |
2133 | } else if (ret == 0) { | |
2134 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; | |
2135 | goto error; | |
2136 | } else { | |
2137 | /* Feature is supported, continue. */ | |
2138 | ret = 0; | |
2139 | } | |
2140 | ||
ab0ee2ca JG |
2141 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2142 | if (!trigger_ht_element) { | |
2143 | ret = -1; | |
2144 | goto error; | |
2145 | } | |
2146 | ||
2147 | /* Add trigger to the trigger_ht. */ | |
2148 | cds_lfht_node_init(&trigger_ht_element->node); | |
2149 | trigger_ht_element->trigger = trigger; | |
2150 | ||
2151 | node = cds_lfht_add_unique(state->triggers_ht, | |
2152 | lttng_condition_hash(condition), | |
2153 | match_condition, | |
2154 | condition, | |
2155 | &trigger_ht_element->node); | |
2156 | if (node != &trigger_ht_element->node) { | |
2157 | /* Not a fatal error, simply report it to the client. */ | |
2158 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2159 | goto error_free_ht_element; | |
2160 | } | |
2161 | ||
2162 | /* | |
2163 | * Ownership of the trigger and of its wrapper was transfered to | |
2164 | * the triggers_ht. | |
2165 | */ | |
2166 | trigger_ht_element = NULL; | |
2167 | free_trigger = false; | |
2168 | ||
2169 | /* | |
2170 | * The rest only applies to triggers that have a "notify" action. | |
2171 | * It is not skipped as this is the only action type currently | |
2172 | * supported. | |
2173 | */ | |
f2b3ef9f JG |
2174 | if (is_trigger_action_notify(trigger)) { |
2175 | client_list = notification_client_list_create(trigger); | |
2176 | if (!client_list) { | |
2177 | ret = -1; | |
2178 | goto error_free_ht_element; | |
ab0ee2ca JG |
2179 | } |
2180 | ||
f2b3ef9f JG |
2181 | /* Build a list of clients to which this new trigger applies. */ |
2182 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
2183 | client_socket_ht_node) { | |
2184 | if (!trigger_applies_to_client(trigger, client)) { | |
2185 | continue; | |
2186 | } | |
2187 | ||
2188 | client_list_element = | |
2189 | zmalloc(sizeof(*client_list_element)); | |
2190 | if (!client_list_element) { | |
2191 | ret = -1; | |
2192 | goto error_put_client_list; | |
2193 | } | |
2194 | ||
2195 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
2196 | client_list_element->client = client; | |
2197 | cds_list_add(&client_list_element->node, | |
2198 | &client_list->list); | |
ab0ee2ca | 2199 | } |
f2b3ef9f JG |
2200 | |
2201 | /* | |
2202 | * Client list ownership transferred to the | |
2203 | * notification_trigger_clients_ht. | |
2204 | */ | |
2205 | publish_notification_client_list(state, client_list); | |
ab0ee2ca JG |
2206 | } |
2207 | ||
f82f93a1 | 2208 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2209 | case LTTNG_OBJECT_TYPE_SESSION: |
2210 | /* Add the trigger to the list if it matches a known session. */ | |
2211 | ret = bind_trigger_to_matching_session(trigger, state); | |
2212 | if (ret) { | |
505b2d90 | 2213 | goto error_put_client_list; |
ab0ee2ca | 2214 | } |
f82f93a1 | 2215 | break; |
51eab943 JG |
2216 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2217 | /* | |
2218 | * Add the trigger to list of triggers bound to the channels | |
2219 | * currently known. | |
2220 | */ | |
2221 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2222 | if (ret) { | |
505b2d90 | 2223 | goto error_put_client_list; |
ab0ee2ca | 2224 | } |
51eab943 JG |
2225 | break; |
2226 | case LTTNG_OBJECT_TYPE_NONE: | |
2227 | break; | |
2228 | default: | |
f2b3ef9f | 2229 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2230 | ret = -1; |
505b2d90 | 2231 | goto error_put_client_list; |
ab0ee2ca JG |
2232 | } |
2233 | ||
2ae99f0b | 2234 | /* |
f2b3ef9f JG |
2235 | * The new trigger's condition must be evaluated against the current |
2236 | * state. | |
2237 | * | |
2238 | * In the case of `notify` action, nothing preventing clients from | |
2239 | * subscribing to a condition before the corresponding trigger is | |
2240 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2241 | * |
2242 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2243 | * reception of a channel sample) to evaluate this new condition, but | |
2244 | * that was broken. | |
2245 | * | |
2246 | * The reason it was broken is that waiting for the next sample | |
2247 | * does not allow us to properly handle transitions for edge-triggered | |
2248 | * conditions. | |
2249 | * | |
2250 | * Consider this example: when we handle a new channel sample, we | |
2251 | * evaluate each conditions twice: once with the previous state, and | |
2252 | * again with the newest state. We then use those two results to | |
2253 | * determine whether a state change happened: a condition was false and | |
2254 | * became true. If a state change happened, we have to notify clients. | |
2255 | * | |
2256 | * Now, if a client subscribes to a given notification and registers | |
2257 | * a trigger *after* that subscription, we have to make sure the | |
2258 | * condition is evaluated at this point while considering only the | |
2259 | * current state. Otherwise, the next evaluation cycle may only see | |
2260 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2261 | * the client will never know that the condition has been met. | |
2262 | */ | |
f2b3ef9f JG |
2263 | switch (get_condition_binding_object(condition)) { |
2264 | case LTTNG_OBJECT_TYPE_SESSION: | |
2265 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2266 | &evaluation, &object_uid, |
2267 | &object_gid); | |
f2b3ef9f JG |
2268 | break; |
2269 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
2270 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2271 | &evaluation, &object_uid, |
2272 | &object_gid); | |
f2b3ef9f JG |
2273 | break; |
2274 | case LTTNG_OBJECT_TYPE_NONE: | |
2275 | ret = 0; | |
2276 | goto error_put_client_list; | |
2277 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
2278 | default: | |
2279 | ret = -1; | |
2280 | goto error_put_client_list; | |
2281 | } | |
2282 | ||
2283 | if (ret) { | |
2284 | /* Fatal error. */ | |
2285 | goto error_put_client_list; | |
2286 | } | |
2287 | ||
ff588497 JR |
2288 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2289 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
2290 | ||
f2b3ef9f JG |
2291 | DBG("Newly registered trigger's condition evaluated to %s", |
2292 | evaluation ? "true" : "false"); | |
2293 | if (!evaluation) { | |
2294 | /* Evaluation yielded nothing. Normal exit. */ | |
2295 | ret = 0; | |
2296 | goto error_put_client_list; | |
2ae99f0b JG |
2297 | } |
2298 | ||
2299 | /* | |
f2b3ef9f JG |
2300 | * Ownership of `evaluation` transferred to the action executor |
2301 | * no matter the result. | |
2ae99f0b | 2302 | */ |
f2b3ef9f JG |
2303 | executor_status = action_executor_enqueue(state->executor, trigger, |
2304 | evaluation, &object_creds, client_list); | |
2305 | evaluation = NULL; | |
2306 | switch (executor_status) { | |
2307 | case ACTION_EXECUTOR_STATUS_OK: | |
2308 | break; | |
2309 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2310 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2311 | /* | |
2312 | * TODO Add trigger identification (name/id) when | |
2313 | * it is added to the API. | |
2314 | */ | |
2315 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2316 | ret = -1; | |
2317 | goto error_put_client_list; | |
2318 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
2319 | /* | |
2320 | * TODO Add trigger identification (name/id) when | |
2321 | * it is added to the API. | |
2322 | * | |
2323 | * Not a fatal error. | |
2324 | */ | |
2325 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2326 | ret = 0; | |
2327 | goto error_put_client_list; | |
2328 | default: | |
2329 | abort(); | |
2330 | } | |
2ae99f0b | 2331 | |
ab0ee2ca | 2332 | *cmd_result = LTTNG_OK; |
505b2d90 JG |
2333 | |
2334 | error_put_client_list: | |
2335 | notification_client_list_put(client_list); | |
2336 | ||
ab0ee2ca JG |
2337 | error_free_ht_element: |
2338 | free(trigger_ht_element); | |
2339 | error: | |
2340 | if (free_trigger) { | |
ab0ee2ca JG |
2341 | lttng_trigger_destroy(trigger); |
2342 | } | |
2343 | rcu_read_unlock(); | |
2344 | return ret; | |
2345 | } | |
2346 | ||
83b934ad MD |
2347 | static |
2348 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2349 | { | |
2350 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2351 | rcu_node)); | |
2352 | } | |
2353 | ||
cc2295b5 | 2354 | static |
ab0ee2ca JG |
2355 | int handle_notification_thread_command_unregister_trigger( |
2356 | struct notification_thread_state *state, | |
2357 | struct lttng_trigger *trigger, | |
2358 | enum lttng_error_code *_cmd_reply) | |
2359 | { | |
2360 | struct cds_lfht_iter iter; | |
ed327204 | 2361 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
2362 | struct lttng_channel_trigger_list *trigger_list; |
2363 | struct notification_client_list *client_list; | |
ab0ee2ca JG |
2364 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
2365 | struct lttng_condition *condition = lttng_trigger_get_condition( | |
2366 | trigger); | |
ab0ee2ca JG |
2367 | enum lttng_error_code cmd_reply; |
2368 | ||
2369 | rcu_read_lock(); | |
2370 | ||
2371 | cds_lfht_lookup(state->triggers_ht, | |
2372 | lttng_condition_hash(condition), | |
2373 | match_condition, | |
2374 | condition, | |
2375 | &iter); | |
2376 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
2377 | if (!triggers_ht_node) { | |
2378 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2379 | goto end; | |
2380 | } else { | |
2381 | cmd_reply = LTTNG_OK; | |
2382 | } | |
2383 | ||
2384 | /* Remove trigger from channel_triggers_ht. */ | |
2385 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
2386 | channel_triggers_ht_node) { | |
2387 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
2388 | ||
2389 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
2390 | &trigger_list->list, node) { | |
9b63a4aa JG |
2391 | const struct lttng_condition *current_condition = |
2392 | lttng_trigger_get_const_condition( | |
ab0ee2ca JG |
2393 | trigger_element->trigger); |
2394 | ||
2395 | assert(current_condition); | |
2396 | if (!lttng_condition_is_equal(condition, | |
2397 | current_condition)) { | |
2398 | continue; | |
2399 | } | |
2400 | ||
2401 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
2402 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
2403 | /* A trigger can only appear once per channel */ |
2404 | break; | |
ab0ee2ca JG |
2405 | } |
2406 | } | |
2407 | ||
2408 | /* | |
2409 | * Remove and release the client list from | |
2410 | * notification_trigger_clients_ht. | |
2411 | */ | |
ed327204 JG |
2412 | client_list = get_client_list_from_condition(state, condition); |
2413 | assert(client_list); | |
2414 | ||
505b2d90 JG |
2415 | /* Put new reference and the hashtable's reference. */ |
2416 | notification_client_list_put(client_list); | |
2417 | notification_client_list_put(client_list); | |
2418 | client_list = NULL; | |
ab0ee2ca JG |
2419 | |
2420 | /* Remove trigger from triggers_ht. */ | |
2421 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
2422 | struct lttng_trigger_ht_element, node); | |
2423 | cds_lfht_del(state->triggers_ht, triggers_ht_node); | |
2424 | ||
7ca172c1 | 2425 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 2426 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 2427 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
2428 | end: |
2429 | rcu_read_unlock(); | |
2430 | if (_cmd_reply) { | |
2431 | *_cmd_reply = cmd_reply; | |
2432 | } | |
2433 | return 0; | |
2434 | } | |
2435 | ||
2436 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
2437 | int handle_notification_thread_command( | |
2438 | struct notification_thread_handle *handle, | |
2439 | struct notification_thread_state *state) | |
2440 | { | |
2441 | int ret; | |
2442 | uint64_t counter; | |
2443 | struct notification_thread_command *cmd; | |
2444 | ||
8abe313a | 2445 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 2446 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 2447 | sizeof(counter)); |
18aeca05 | 2448 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
2449 | goto error; |
2450 | } | |
2451 | ||
2452 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
2453 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
2454 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
2455 | cds_list_del(&cmd->cmd_list_node); |
2456 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
ab0ee2ca JG |
2457 | switch (cmd->type) { |
2458 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
2459 | DBG("[notification-thread] Received register trigger command"); | |
2460 | ret = handle_notification_thread_command_register_trigger( | |
2461 | state, cmd->parameters.trigger, | |
2462 | &cmd->reply_code); | |
2463 | break; | |
2464 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
2465 | DBG("[notification-thread] Received unregister trigger command"); | |
2466 | ret = handle_notification_thread_command_unregister_trigger( | |
2467 | state, cmd->parameters.trigger, | |
2468 | &cmd->reply_code); | |
2469 | break; | |
2470 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
2471 | DBG("[notification-thread] Received add channel command"); | |
2472 | ret = handle_notification_thread_command_add_channel( | |
8abe313a JG |
2473 | state, |
2474 | cmd->parameters.add_channel.session.name, | |
2475 | cmd->parameters.add_channel.session.uid, | |
2476 | cmd->parameters.add_channel.session.gid, | |
2477 | cmd->parameters.add_channel.channel.name, | |
2478 | cmd->parameters.add_channel.channel.domain, | |
2479 | cmd->parameters.add_channel.channel.key, | |
2480 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
2481 | &cmd->reply_code); |
2482 | break; | |
2483 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
2484 | DBG("[notification-thread] Received remove channel command"); | |
2485 | ret = handle_notification_thread_command_remove_channel( | |
2486 | state, cmd->parameters.remove_channel.key, | |
2487 | cmd->parameters.remove_channel.domain, | |
2488 | &cmd->reply_code); | |
2489 | break; | |
0ca52944 | 2490 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 2491 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 JG |
2492 | DBG("[notification-thread] Received session rotation %s command", |
2493 | cmd->type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING ? | |
2494 | "ongoing" : "completed"); | |
2495 | ret = handle_notification_thread_command_session_rotation( | |
0ca52944 | 2496 | state, |
ed327204 JG |
2497 | cmd->type, |
2498 | cmd->parameters.session_rotation.session_name, | |
2499 | cmd->parameters.session_rotation.uid, | |
2500 | cmd->parameters.session_rotation.gid, | |
2501 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
2502 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
2503 | &cmd->reply_code); |
2504 | break; | |
ab0ee2ca JG |
2505 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
2506 | DBG("[notification-thread] Received quit command"); | |
2507 | cmd->reply_code = LTTNG_OK; | |
2508 | ret = 1; | |
2509 | goto end; | |
f2b3ef9f JG |
2510 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
2511 | { | |
2512 | const enum client_transmission_status client_status = | |
2513 | cmd->parameters.client_communication_update | |
2514 | .status; | |
2515 | const notification_client_id client_id = | |
2516 | cmd->parameters.client_communication_update.id; | |
2517 | struct notification_client *client; | |
2518 | ||
2519 | rcu_read_lock(); | |
2520 | client = get_client_from_id(client_id, state); | |
2521 | ||
2522 | if (!client) { | |
2523 | /* | |
2524 | * Client error was probably already picked-up by the | |
2525 | * notification thread or it has disconnected | |
2526 | * gracefully while this command was queued. | |
2527 | */ | |
2528 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
2529 | client_id); | |
2530 | ret = 0; | |
2531 | } else { | |
f2b3ef9f JG |
2532 | ret = client_handle_transmission_status( |
2533 | client, client_status, state); | |
f2b3ef9f JG |
2534 | } |
2535 | rcu_read_unlock(); | |
2536 | break; | |
2537 | } | |
ab0ee2ca JG |
2538 | default: |
2539 | ERR("[notification-thread] Unknown internal command received"); | |
2540 | goto error_unlock; | |
2541 | } | |
2542 | ||
2543 | if (ret) { | |
2544 | goto error_unlock; | |
2545 | } | |
2546 | end: | |
0ab399e0 JG |
2547 | if (cmd->is_async) { |
2548 | free(cmd); | |
2549 | cmd = NULL; | |
2550 | } else { | |
2551 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
2552 | } | |
ab0ee2ca JG |
2553 | return ret; |
2554 | error_unlock: | |
2555 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 2556 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
2557 | cmd->reply_code = LTTNG_ERR_FATAL; |
2558 | error: | |
2559 | /* Indicate a fatal error to the caller. */ | |
2560 | return -1; | |
2561 | } | |
2562 | ||
ab0ee2ca JG |
2563 | static |
2564 | int socket_set_non_blocking(int socket) | |
2565 | { | |
2566 | int ret, flags; | |
2567 | ||
2568 | /* Set the pipe as non-blocking. */ | |
2569 | ret = fcntl(socket, F_GETFL, 0); | |
2570 | if (ret == -1) { | |
2571 | PERROR("fcntl get socket flags"); | |
2572 | goto end; | |
2573 | } | |
2574 | flags = ret; | |
2575 | ||
2576 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
2577 | if (ret == -1) { | |
2578 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
2579 | goto end; | |
2580 | } | |
2581 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
2582 | end: | |
2583 | return ret; | |
2584 | } | |
2585 | ||
2586 | static | |
14fa22f8 | 2587 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
2588 | { |
2589 | int ret; | |
2590 | ||
882093ee JR |
2591 | |
2592 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
2593 | |
2594 | client->communication.inbound.bytes_to_receive = | |
2595 | sizeof(struct lttng_notification_channel_message); | |
2596 | client->communication.inbound.msg_type = | |
2597 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
2598 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
2599 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 2600 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 2601 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 2602 | client->communication.inbound.bytes_to_receive); |
882093ee | 2603 | |
14fa22f8 | 2604 | return ret; |
ab0ee2ca JG |
2605 | } |
2606 | ||
2607 | int handle_notification_thread_client_connect( | |
2608 | struct notification_thread_state *state) | |
2609 | { | |
2610 | int ret; | |
2611 | struct notification_client *client; | |
2612 | ||
2613 | DBG("[notification-thread] Handling new notification channel client connection"); | |
2614 | ||
2615 | client = zmalloc(sizeof(*client)); | |
2616 | if (!client) { | |
2617 | /* Fatal error. */ | |
2618 | ret = -1; | |
2619 | goto error; | |
2620 | } | |
6c24d3fd | 2621 | |
505b2d90 | 2622 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 2623 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 2624 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
2625 | lttng_payload_init(&client->communication.inbound.payload); |
2626 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 2627 | client->communication.inbound.expect_creds = true; |
505b2d90 | 2628 | |
14fa22f8 JG |
2629 | ret = client_reset_inbound_state(client); |
2630 | if (ret) { | |
2631 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
e742b055 | 2632 | ret = 0; |
14fa22f8 JG |
2633 | goto error; |
2634 | } | |
ab0ee2ca JG |
2635 | |
2636 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
2637 | if (ret < 0) { | |
2638 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
2639 | ret = 0; | |
2640 | goto error; | |
2641 | } | |
2642 | ||
2643 | client->socket = ret; | |
2644 | ||
2645 | ret = socket_set_non_blocking(client->socket); | |
2646 | if (ret) { | |
2647 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
2648 | goto error; | |
2649 | } | |
2650 | ||
2651 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
2652 | if (ret < 0) { | |
2653 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
2654 | ret = 0; | |
2655 | goto error; | |
2656 | } | |
2657 | ||
2658 | ret = lttng_poll_add(&state->events, client->socket, | |
2659 | LPOLLIN | LPOLLERR | | |
2660 | LPOLLHUP | LPOLLRDHUP); | |
2661 | if (ret < 0) { | |
2662 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
2663 | ret = 0; | |
2664 | goto error; | |
2665 | } | |
2666 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
2667 | client->socket); | |
2668 | ||
ab0ee2ca JG |
2669 | rcu_read_lock(); |
2670 | cds_lfht_add(state->client_socket_ht, | |
2671 | hash_client_socket(client->socket), | |
2672 | &client->client_socket_ht_node); | |
ac1889bf JG |
2673 | cds_lfht_add(state->client_id_ht, |
2674 | hash_client_id(client->id), | |
2675 | &client->client_id_ht_node); | |
ab0ee2ca JG |
2676 | rcu_read_unlock(); |
2677 | ||
2678 | return ret; | |
6c24d3fd | 2679 | |
ab0ee2ca JG |
2680 | error: |
2681 | notification_client_destroy(client, state); | |
2682 | return ret; | |
2683 | } | |
2684 | ||
6c24d3fd JG |
2685 | /* |
2686 | * RCU read-lock must be held by the caller. | |
2687 | * Client lock must _not_ be held by the caller. | |
2688 | */ | |
505b2d90 JG |
2689 | static |
2690 | int notification_thread_client_disconnect( | |
2691 | struct notification_client *client, | |
ab0ee2ca | 2692 | struct notification_thread_state *state) |
505b2d90 JG |
2693 | { |
2694 | int ret; | |
2695 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
2696 | ||
2697 | /* Acquire the client lock to disable its communication atomically. */ | |
6c24d3fd | 2698 | pthread_mutex_lock(&client->lock); |
505b2d90 | 2699 | client->communication.active = false; |
6c24d3fd JG |
2700 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
2701 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
2702 | pthread_mutex_unlock(&client->lock); | |
2703 | ||
505b2d90 JG |
2704 | ret = lttng_poll_del(&state->events, client->socket); |
2705 | if (ret) { | |
2706 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
2707 | client->socket); | |
2708 | } | |
2709 | ||
505b2d90 JG |
2710 | /* Release all conditions to which the client was subscribed. */ |
2711 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
2712 | &client->condition_list, node) { | |
2713 | (void) notification_thread_client_unsubscribe(client, | |
2714 | condition_list_element->condition, state, NULL); | |
2715 | } | |
2716 | ||
2717 | /* | |
2718 | * Client no longer accessible to other threads (through the | |
2719 | * client lists). | |
2720 | */ | |
2721 | notification_client_destroy(client, state); | |
2722 | return ret; | |
2723 | } | |
2724 | ||
2725 | int handle_notification_thread_client_disconnect( | |
2726 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
2727 | { |
2728 | int ret = 0; | |
2729 | struct notification_client *client; | |
2730 | ||
2731 | rcu_read_lock(); | |
2732 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
2733 | client_socket); | |
2734 | client = get_client_from_socket(client_socket, state); | |
2735 | if (!client) { | |
2736 | /* Internal state corruption, fatal error. */ | |
2737 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
2738 | client_socket); | |
2739 | ret = -1; | |
2740 | goto end; | |
2741 | } | |
2742 | ||
505b2d90 | 2743 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
2744 | end: |
2745 | rcu_read_unlock(); | |
2746 | return ret; | |
2747 | } | |
2748 | ||
2749 | int handle_notification_thread_client_disconnect_all( | |
2750 | struct notification_thread_state *state) | |
2751 | { | |
2752 | struct cds_lfht_iter iter; | |
2753 | struct notification_client *client; | |
2754 | bool error_encoutered = false; | |
2755 | ||
2756 | rcu_read_lock(); | |
2757 | DBG("[notification-thread] Closing all client connections"); | |
2758 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
505b2d90 | 2759 | client_socket_ht_node) { |
ab0ee2ca JG |
2760 | int ret; |
2761 | ||
505b2d90 JG |
2762 | ret = notification_thread_client_disconnect( |
2763 | client, state); | |
ab0ee2ca JG |
2764 | if (ret) { |
2765 | error_encoutered = true; | |
2766 | } | |
2767 | } | |
2768 | rcu_read_unlock(); | |
2769 | return error_encoutered ? 1 : 0; | |
2770 | } | |
2771 | ||
2772 | int handle_notification_thread_trigger_unregister_all( | |
2773 | struct notification_thread_state *state) | |
2774 | { | |
4149ace8 | 2775 | bool error_occurred = false; |
ab0ee2ca JG |
2776 | struct cds_lfht_iter iter; |
2777 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2778 | ||
763de384 | 2779 | rcu_read_lock(); |
ab0ee2ca JG |
2780 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
2781 | node) { | |
2782 | int ret = handle_notification_thread_command_unregister_trigger( | |
2783 | state, trigger_ht_element->trigger, NULL); | |
2784 | if (ret) { | |
4149ace8 | 2785 | error_occurred = true; |
ab0ee2ca JG |
2786 | } |
2787 | } | |
763de384 | 2788 | rcu_read_unlock(); |
4149ace8 | 2789 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
2790 | } |
2791 | ||
dd877ea6 JG |
2792 | static |
2793 | int client_handle_transmission_status( | |
2794 | struct notification_client *client, | |
2795 | enum client_transmission_status transmission_status, | |
2796 | struct notification_thread_state *state) | |
2797 | { | |
2798 | int ret = 0; | |
2799 | ||
2800 | switch (transmission_status) { | |
2801 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
2802 | ret = lttng_poll_mod(&state->events, client->socket, | |
2803 | CLIENT_POLL_MASK_IN); | |
2804 | if (ret) { | |
2805 | goto end; | |
2806 | } | |
2807 | ||
dd877ea6 JG |
2808 | break; |
2809 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
2810 | /* | |
2811 | * We want to be notified whenever there is buffer space | |
2812 | * available to send the rest of the payload. | |
2813 | */ | |
2814 | ret = lttng_poll_mod(&state->events, client->socket, | |
2815 | CLIENT_POLL_MASK_IN_OUT); | |
2816 | if (ret) { | |
2817 | goto end; | |
2818 | } | |
2819 | break; | |
2820 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
2821 | ret = notification_thread_client_disconnect(client, state); | |
2822 | if (ret) { | |
2823 | goto end; | |
2824 | } | |
2825 | break; | |
2826 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
2827 | ret = -1; | |
2828 | goto end; | |
2829 | default: | |
2830 | abort(); | |
2831 | } | |
2832 | end: | |
2833 | return ret; | |
2834 | } | |
2835 | ||
505b2d90 | 2836 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 2837 | static |
dd877ea6 | 2838 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 2839 | struct notification_client *client) |
ab0ee2ca JG |
2840 | { |
2841 | ssize_t ret; | |
2842 | size_t to_send_count; | |
dd877ea6 | 2843 | enum client_transmission_status status; |
882093ee JR |
2844 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
2845 | &client->communication.outbound.payload, 0, -1); | |
2846 | const int fds_to_send_count = | |
2847 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 2848 | |
505b2d90 JG |
2849 | ASSERT_LOCKED(client->lock); |
2850 | ||
f2b3ef9f JG |
2851 | if (!client->communication.active) { |
2852 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
2853 | goto end; | |
2854 | } | |
2855 | ||
882093ee JR |
2856 | if (pv.buffer.size == 0) { |
2857 | /* | |
2858 | * If both data and fds are equal to zero, we are in an invalid | |
2859 | * state. | |
2860 | */ | |
2861 | assert(fds_to_send_count != 0); | |
2862 | goto send_fds; | |
2863 | } | |
2864 | ||
2865 | /* Send data. */ | |
2866 | to_send_count = pv.buffer.size; | |
ab0ee2ca JG |
2867 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", |
2868 | client->socket); | |
2869 | ||
2870 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 2871 | pv.buffer.data, |
ab0ee2ca | 2872 | to_send_count); |
44c180ca | 2873 | if ((ret >= 0 && ret < to_send_count)) { |
ab0ee2ca JG |
2874 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", |
2875 | client->socket); | |
2876 | to_send_count -= max(ret, 0); | |
2877 | ||
6f110534 | 2878 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
2879 | pv.buffer.data + |
2880 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
2881 | to_send_count); |
2882 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 2883 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
2884 | to_send_count); |
2885 | if (ret) { | |
2886 | goto error; | |
2887 | } | |
6c24d3fd | 2888 | |
dd877ea6 | 2889 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 2890 | goto end; |
ab0ee2ca | 2891 | } else if (ret < 0) { |
6c24d3fd | 2892 | /* Generic error, disable the client's communication. */ |
dd877ea6 | 2893 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 2894 | client->socket); |
6c24d3fd | 2895 | client->communication.active = false; |
dd877ea6 | 2896 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 2897 | goto end; |
ab0ee2ca | 2898 | } else { |
882093ee JR |
2899 | /* |
2900 | * No error and flushed the queue completely. | |
2901 | * | |
2902 | * The payload buffer size is used later to | |
2903 | * check if there is notifications queued. So albeit that the | |
2904 | * direct caller knows that the transmission is complete, we | |
2905 | * need to set the buffer size to zero. | |
2906 | */ | |
ab0ee2ca | 2907 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 2908 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
2909 | if (ret) { |
2910 | goto error; | |
2911 | } | |
882093ee | 2912 | } |
6c24d3fd | 2913 | |
882093ee JR |
2914 | send_fds: |
2915 | /* No fds to send, transmission is complete. */ | |
2916 | if (fds_to_send_count == 0) { | |
dd877ea6 | 2917 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 2918 | goto end; |
dd877ea6 | 2919 | } |
882093ee JR |
2920 | |
2921 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
2922 | client->socket, &pv); | |
2923 | if (ret < 0) { | |
2924 | /* Generic error, disable the client's communication. */ | |
2925 | ERR("[notification-thread] Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", | |
2926 | client->socket); | |
2927 | client->communication.active = false; | |
2928 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
2929 | goto end; | |
2930 | } else if (ret == 0) { | |
2931 | /* Nothing could be sent. */ | |
2932 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
2933 | } else { | |
2934 | /* Fd passing is an all or nothing kind of thing. */ | |
2935 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
2936 | /* | |
2937 | * The payload _fd_array count is used later to | |
2938 | * check if there is notifications queued. So although the | |
2939 | * direct caller knows that the transmission is complete, we | |
2940 | * need to clear the _fd_array for the queuing check. | |
2941 | */ | |
2942 | lttng_dynamic_pointer_array_clear( | |
2943 | &client->communication.outbound.payload | |
2944 | ._fd_handles); | |
2945 | } | |
2946 | ||
f2b3ef9f | 2947 | end: |
882093ee JR |
2948 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
2949 | client->communication.outbound.queued_command_reply = false; | |
2950 | client->communication.outbound.dropped_notification = false; | |
2951 | lttng_payload_clear(&client->communication.outbound.payload); | |
2952 | } | |
2953 | ||
f2b3ef9f | 2954 | return status; |
ab0ee2ca | 2955 | error: |
f2b3ef9f | 2956 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
2957 | } |
2958 | ||
882093ee JR |
2959 | static |
2960 | bool client_has_outbound_data_left( | |
2961 | const struct notification_client *client) | |
2962 | { | |
2963 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
2964 | &client->communication.outbound.payload, 0, -1); | |
2965 | const bool has_data = pv.buffer.size != 0; | |
2966 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
2967 | ||
2968 | return has_data || has_fds; | |
2969 | } | |
2970 | ||
6c24d3fd | 2971 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
2972 | static |
2973 | int client_send_command_reply(struct notification_client *client, | |
2974 | struct notification_thread_state *state, | |
2975 | enum lttng_notification_channel_status status) | |
2976 | { | |
2977 | int ret; | |
2978 | struct lttng_notification_channel_command_reply reply = { | |
2979 | .status = (int8_t) status, | |
2980 | }; | |
2981 | struct lttng_notification_channel_message msg = { | |
2982 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
2983 | .size = sizeof(reply), | |
2984 | }; | |
2985 | char buffer[sizeof(msg) + sizeof(reply)]; | |
f2b3ef9f | 2986 | enum client_transmission_status transmission_status; |
ab0ee2ca | 2987 | |
6c24d3fd JG |
2988 | memcpy(buffer, &msg, sizeof(msg)); |
2989 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
2990 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
505b2d90 | 2991 | |
6c24d3fd | 2992 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
2993 | if (client->communication.outbound.queued_command_reply) { |
2994 | /* Protocol error. */ | |
6c24d3fd | 2995 | goto error_unlock; |
ab0ee2ca JG |
2996 | } |
2997 | ||
ab0ee2ca JG |
2998 | /* Enqueue buffer to outgoing queue and flush it. */ |
2999 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3000 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3001 | buffer, sizeof(buffer)); |
3002 | if (ret) { | |
6c24d3fd | 3003 | goto error_unlock; |
ab0ee2ca JG |
3004 | } |
3005 | ||
f2b3ef9f | 3006 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3007 | |
3008 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3009 | /* Queue could not be emptied. */ |
3010 | client->communication.outbound.queued_command_reply = true; | |
3011 | } | |
3012 | ||
3013 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3014 | ret = client_handle_transmission_status( |
3015 | client, transmission_status, state); | |
ab0ee2ca JG |
3016 | if (ret) { |
3017 | goto error; | |
3018 | } | |
3019 | ||
ab0ee2ca | 3020 | return 0; |
6c24d3fd JG |
3021 | error_unlock: |
3022 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3023 | error: |
3024 | return -1; | |
3025 | } | |
3026 | ||
505b2d90 JG |
3027 | static |
3028 | int client_handle_message_unknown(struct notification_client *client, | |
3029 | struct notification_thread_state *state) | |
3030 | { | |
3031 | int ret; | |
505b2d90 JG |
3032 | /* |
3033 | * Receiving message header. The function will be called again | |
3034 | * once the rest of the message as been received and can be | |
3035 | * interpreted. | |
3036 | */ | |
3037 | const struct lttng_notification_channel_message *msg; | |
3038 | ||
882093ee | 3039 | assert(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3040 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3041 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3042 | |
3043 | if (msg->size == 0 || | |
3044 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
3045 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
3046 | msg->size); | |
3047 | ret = -1; | |
3048 | goto end; | |
3049 | } | |
3050 | ||
3051 | switch (msg->type) { | |
3052 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3053 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3054 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3055 | break; | |
3056 | default: | |
3057 | ret = -1; | |
3058 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
3059 | goto end; | |
3060 | } | |
3061 | ||
3062 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3063 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3064 | client->communication.inbound.msg_type = |
3065 | (enum lttng_notification_channel_message_type) msg->type; | |
3066 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3067 | &client->communication.inbound.payload.buffer, msg->size); |
3068 | ||
3069 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3070 | msg = NULL; | |
505b2d90 | 3071 | end: |
505b2d90 JG |
3072 | return ret; |
3073 | } | |
3074 | ||
3075 | static | |
3076 | int client_handle_message_handshake(struct notification_client *client, | |
3077 | struct notification_thread_state *state) | |
3078 | { | |
3079 | int ret; | |
3080 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3081 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3082 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3083 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3084 | }; | |
3085 | const struct lttng_notification_channel_message msg_header = { | |
3086 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3087 | .size = sizeof(handshake_reply), | |
3088 | }; | |
3089 | enum lttng_notification_channel_status status = | |
3090 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3091 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 JG |
3092 | |
3093 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3094 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3095 | sizeof(handshake_reply)); | |
3096 | ||
3097 | handshake_client = | |
3098 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3099 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3100 | .data; |
3101 | client->major = handshake_client->major; | |
3102 | client->minor = handshake_client->minor; | |
3103 | if (!client->communication.inbound.creds_received) { | |
3104 | ERR("[notification-thread] No credentials received from client"); | |
3105 | ret = -1; | |
3106 | goto end; | |
3107 | } | |
3108 | ||
3109 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3110 | &client->communication.inbound.creds); | |
3111 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3112 | &client->communication.inbound.creds); | |
3113 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
3114 | client->uid, client->gid, (int) client->major, | |
3115 | (int) client->minor); | |
3116 | ||
3117 | if (handshake_client->major != | |
3118 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3119 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3120 | } | |
3121 | ||
6c24d3fd JG |
3122 | pthread_mutex_lock(&client->lock); |
3123 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3124 | ret = lttng_dynamic_buffer_append( |
882093ee | 3125 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3126 | sizeof(send_buffer)); |
3127 | if (ret) { | |
3128 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
6c24d3fd | 3129 | goto end_unlock; |
505b2d90 JG |
3130 | } |
3131 | ||
3132 | client->validated = true; | |
3133 | client->communication.active = true; | |
6c24d3fd | 3134 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3135 | |
6c24d3fd JG |
3136 | /* Set reception state to receive the next message header. */ |
3137 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3138 | if (ret) { |
6c24d3fd | 3139 | ERR("[notification-thread] Failed to reset client communication's inbound state"); |
505b2d90 JG |
3140 | goto end; |
3141 | } | |
3142 | ||
6c24d3fd | 3143 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3144 | ret = client_send_command_reply(client, state, status); |
3145 | if (ret) { | |
3146 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3147 | goto end; | |
3148 | } | |
3149 | ||
6c24d3fd JG |
3150 | goto end; |
3151 | end_unlock: | |
505b2d90 | 3152 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3153 | end: |
505b2d90 JG |
3154 | return ret; |
3155 | } | |
3156 | ||
3157 | static | |
3158 | int client_handle_message_subscription( | |
3159 | struct notification_client *client, | |
3160 | enum lttng_notification_channel_message_type msg_type, | |
3161 | struct notification_thread_state *state) | |
3162 | { | |
3163 | int ret; | |
3164 | struct lttng_condition *condition; | |
3165 | enum lttng_notification_channel_status status = | |
3166 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3167 | struct lttng_payload_view condition_view = | |
882093ee JR |
3168 | lttng_payload_view_from_payload( |
3169 | &client->communication.inbound.payload, | |
505b2d90 JG |
3170 | 0, -1); |
3171 | size_t expected_condition_size; | |
3172 | ||
6c24d3fd JG |
3173 | /* |
3174 | * No need to lock client to sample the inbound state as the only | |
3175 | * other thread accessing clients (action executor) only uses the | |
3176 | * outbound state. | |
3177 | */ | |
882093ee | 3178 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3179 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3180 | if (ret != expected_condition_size) { | |
3181 | ERR("[notification-thread] Malformed condition received from client"); | |
3182 | goto end; | |
3183 | } | |
3184 | ||
3185 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
3186 | ret = notification_thread_client_subscribe( | |
3187 | client, condition, state, &status); | |
3188 | } else { | |
3189 | ret = notification_thread_client_unsubscribe( | |
3190 | client, condition, state, &status); | |
3191 | } | |
505b2d90 | 3192 | |
505b2d90 | 3193 | if (ret) { |
6c24d3fd | 3194 | goto end; |
505b2d90 JG |
3195 | } |
3196 | ||
3197 | /* Set reception state to receive the next message header. */ | |
3198 | ret = client_reset_inbound_state(client); | |
3199 | if (ret) { | |
3200 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
6c24d3fd JG |
3201 | goto end; |
3202 | } | |
3203 | ||
3204 | ret = client_send_command_reply(client, state, status); | |
3205 | if (ret) { | |
3206 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3207 | goto end; | |
505b2d90 JG |
3208 | } |
3209 | ||
505b2d90 JG |
3210 | end: |
3211 | return ret; | |
3212 | } | |
3213 | ||
ab0ee2ca JG |
3214 | static |
3215 | int client_dispatch_message(struct notification_client *client, | |
3216 | struct notification_thread_state *state) | |
3217 | { | |
3218 | int ret = 0; | |
3219 | ||
3220 | if (client->communication.inbound.msg_type != | |
3221 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3222 | client->communication.inbound.msg_type != | |
3223 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3224 | !client->validated) { | |
3225 | WARN("[notification-thread] client attempted a command before handshake"); | |
3226 | ret = -1; | |
3227 | goto end; | |
3228 | } | |
3229 | ||
3230 | switch (client->communication.inbound.msg_type) { | |
3231 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3232 | { | |
505b2d90 | 3233 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3234 | break; |
3235 | } | |
3236 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3237 | { | |
505b2d90 | 3238 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3239 | break; |
3240 | } | |
3241 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3242 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3243 | { | |
505b2d90 JG |
3244 | ret = client_handle_message_subscription(client, |
3245 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3246 | break; |
3247 | } | |
3248 | default: | |
3249 | abort(); | |
3250 | } | |
3251 | end: | |
3252 | return ret; | |
3253 | } | |
3254 | ||
3255 | /* Incoming data from client. */ | |
3256 | int handle_notification_thread_client_in( | |
3257 | struct notification_thread_state *state, int socket) | |
3258 | { | |
14fa22f8 | 3259 | int ret = 0; |
ab0ee2ca JG |
3260 | struct notification_client *client; |
3261 | ssize_t recv_ret; | |
3262 | size_t offset; | |
3263 | ||
98b5ff34 | 3264 | rcu_read_lock(); |
ab0ee2ca JG |
3265 | client = get_client_from_socket(socket, state); |
3266 | if (!client) { | |
3267 | /* Internal error, abort. */ | |
3268 | ret = -1; | |
3269 | goto end; | |
3270 | } | |
3271 | ||
882093ee | 3272 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 3273 | client->communication.inbound.bytes_to_receive; |
01ea340e | 3274 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 3275 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 3276 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3277 | client->communication.inbound.bytes_to_receive, |
3278 | &client->communication.inbound.creds); | |
3279 | if (recv_ret > 0) { | |
01ea340e | 3280 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3281 | client->communication.inbound.creds_received = true; |
3282 | } | |
3283 | } else { | |
3284 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 3285 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
3286 | client->communication.inbound.bytes_to_receive); |
3287 | } | |
505b2d90 JG |
3288 | if (recv_ret >= 0) { |
3289 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
3290 | } else { |
3291 | goto error_disconnect_client; | |
505b2d90 | 3292 | } |
6c24d3fd | 3293 | |
882093ee JR |
3294 | if (client->communication.inbound.bytes_to_receive != 0) { |
3295 | /* Message incomplete wait for more data. */ | |
3296 | ret = 0; | |
3297 | goto end; | |
ab0ee2ca JG |
3298 | } |
3299 | ||
882093ee JR |
3300 | assert(client->communication.inbound.bytes_to_receive == 0); |
3301 | ||
3302 | /* Receive fds. */ | |
3303 | if (client->communication.inbound.fds_to_receive != 0) { | |
3304 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
3305 | client->socket, | |
3306 | client->communication.inbound.fds_to_receive, | |
3307 | &client->communication.inbound.payload); | |
3308 | if (ret > 0) { | |
ab0ee2ca | 3309 | /* |
882093ee JR |
3310 | * Fds received. non blocking fds passing is all |
3311 | * or nothing. | |
ab0ee2ca | 3312 | */ |
882093ee JR |
3313 | ssize_t expected_size; |
3314 | ||
3315 | expected_size = sizeof(int) * | |
3316 | client->communication.inbound | |
3317 | .fds_to_receive; | |
3318 | assert(ret == expected_size); | |
3319 | client->communication.inbound.fds_to_receive = 0; | |
3320 | } else if (ret == 0) { | |
3321 | /* Received nothing. */ | |
3322 | ret = 0; | |
3323 | goto end; | |
3324 | } else { | |
ab0ee2ca JG |
3325 | goto error_disconnect_client; |
3326 | } | |
ab0ee2ca | 3327 | } |
882093ee JR |
3328 | |
3329 | /* At this point the message is complete.*/ | |
3330 | assert(client->communication.inbound.bytes_to_receive == 0 && | |
3331 | client->communication.inbound.fds_to_receive == 0); | |
3332 | ret = client_dispatch_message(client, state); | |
3333 | if (ret) { | |
3334 | /* | |
3335 | * Only returns an error if this client must be | |
3336 | * disconnected. | |
3337 | */ | |
3338 | goto error_disconnect_client; | |
3339 | } | |
3340 | ||
ab0ee2ca | 3341 | end: |
98b5ff34 | 3342 | rcu_read_unlock(); |
ab0ee2ca | 3343 | return ret; |
882093ee | 3344 | |
ab0ee2ca | 3345 | error_disconnect_client: |
505b2d90 | 3346 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 3347 | goto end; |
ab0ee2ca JG |
3348 | } |
3349 | ||
3350 | /* Client ready to receive outgoing data. */ | |
3351 | int handle_notification_thread_client_out( | |
3352 | struct notification_thread_state *state, int socket) | |
3353 | { | |
3354 | int ret; | |
3355 | struct notification_client *client; | |
f2b3ef9f | 3356 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3357 | |
98b5ff34 | 3358 | rcu_read_lock(); |
ab0ee2ca JG |
3359 | client = get_client_from_socket(socket, state); |
3360 | if (!client) { | |
3361 | /* Internal error, abort. */ | |
3362 | ret = -1; | |
3363 | goto end; | |
3364 | } | |
3365 | ||
505b2d90 | 3366 | pthread_mutex_lock(&client->lock); |
f2b3ef9f | 3367 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd JG |
3368 | pthread_mutex_unlock(&client->lock); |
3369 | ||
f2b3ef9f JG |
3370 | ret = client_handle_transmission_status( |
3371 | client, transmission_status, state); | |
ab0ee2ca JG |
3372 | if (ret) { |
3373 | goto end; | |
3374 | } | |
3375 | end: | |
98b5ff34 | 3376 | rcu_read_unlock(); |
ab0ee2ca JG |
3377 | return ret; |
3378 | } | |
3379 | ||
3380 | static | |
e8360425 JD |
3381 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
3382 | const struct channel_state_sample *sample, | |
3383 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
3384 | { |
3385 | bool result = false; | |
3386 | uint64_t threshold; | |
3387 | enum lttng_condition_type condition_type; | |
e8360425 | 3388 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
3389 | condition, struct lttng_condition_buffer_usage, |
3390 | parent); | |
3391 | ||
ab0ee2ca JG |
3392 | if (use_condition->threshold_bytes.set) { |
3393 | threshold = use_condition->threshold_bytes.value; | |
3394 | } else { | |
3395 | /* | |
3396 | * Threshold was expressed as a ratio. | |
3397 | * | |
3398 | * TODO the threshold (in bytes) of conditions expressed | |
3399 | * as a ratio of total buffer size could be cached to | |
3400 | * forego this double-multiplication or it could be performed | |
3401 | * as fixed-point math. | |
3402 | * | |
d49487dc | 3403 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
3404 | * condition applies to multiple channels (i.e. don't assume |
3405 | * that all channels matching my_chann* have the same size...) | |
3406 | */ | |
3407 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
3408 | (double) buffer_capacity); | |
3409 | } | |
3410 | ||
3411 | condition_type = lttng_condition_get_type(condition); | |
3412 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
3413 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3414 | threshold, sample->highest_usage); | |
3415 | ||
3416 | /* | |
3417 | * The low condition should only be triggered once _all_ of the | |
3418 | * streams in a channel have gone below the "low" threshold. | |
3419 | */ | |
3420 | if (sample->highest_usage <= threshold) { | |
3421 | result = true; | |
3422 | } | |
3423 | } else { | |
3424 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3425 | threshold, sample->highest_usage); | |
3426 | ||
3427 | /* | |
3428 | * For high buffer usage scenarios, we want to trigger whenever | |
3429 | * _any_ of the streams has reached the "high" threshold. | |
3430 | */ | |
3431 | if (sample->highest_usage >= threshold) { | |
3432 | result = true; | |
3433 | } | |
3434 | } | |
e8360425 | 3435 | |
ab0ee2ca JG |
3436 | return result; |
3437 | } | |
3438 | ||
3439 | static | |
e8360425 JD |
3440 | bool evaluate_session_consumed_size_condition( |
3441 | const struct lttng_condition *condition, | |
3442 | uint64_t session_consumed_size) | |
3443 | { | |
3444 | uint64_t threshold; | |
3445 | const struct lttng_condition_session_consumed_size *size_condition = | |
3446 | container_of(condition, | |
3447 | struct lttng_condition_session_consumed_size, | |
3448 | parent); | |
3449 | ||
3450 | threshold = size_condition->consumed_threshold_bytes.value; | |
3451 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
3452 | threshold, session_consumed_size); | |
3453 | return session_consumed_size >= threshold; | |
3454 | } | |
3455 | ||
3456 | static | |
ed327204 | 3457 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 3458 | struct lttng_evaluation **evaluation, |
e8360425 JD |
3459 | const struct notification_thread_state *state, |
3460 | const struct channel_state_sample *previous_sample, | |
3461 | const struct channel_state_sample *latest_sample, | |
3462 | uint64_t previous_session_consumed_total, | |
3463 | uint64_t latest_session_consumed_total, | |
3464 | struct channel_info *channel_info) | |
ab0ee2ca JG |
3465 | { |
3466 | int ret = 0; | |
3467 | enum lttng_condition_type condition_type; | |
e8360425 JD |
3468 | const bool previous_sample_available = !!previous_sample; |
3469 | bool previous_sample_result = false; | |
ab0ee2ca JG |
3470 | bool latest_sample_result; |
3471 | ||
3472 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 3473 | |
e8360425 JD |
3474 | switch (condition_type) { |
3475 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3476 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
3477 | if (caa_likely(previous_sample_available)) { | |
3478 | previous_sample_result = | |
3479 | evaluate_buffer_usage_condition(condition, | |
3480 | previous_sample, channel_info->capacity); | |
3481 | } | |
3482 | latest_sample_result = evaluate_buffer_usage_condition( | |
3483 | condition, latest_sample, | |
3484 | channel_info->capacity); | |
3485 | break; | |
3486 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3487 | if (caa_likely(previous_sample_available)) { | |
3488 | previous_sample_result = | |
3489 | evaluate_session_consumed_size_condition( | |
3490 | condition, | |
3491 | previous_session_consumed_total); | |
3492 | } | |
3493 | latest_sample_result = | |
3494 | evaluate_session_consumed_size_condition( | |
3495 | condition, | |
3496 | latest_session_consumed_total); | |
3497 | break; | |
3498 | default: | |
3499 | /* Unknown condition type; internal error. */ | |
3500 | abort(); | |
3501 | } | |
ab0ee2ca JG |
3502 | |
3503 | if (!latest_sample_result || | |
3504 | (previous_sample_result == latest_sample_result)) { | |
3505 | /* | |
3506 | * Only trigger on a condition evaluation transition. | |
3507 | * | |
3508 | * NOTE: This edge-triggered logic may not be appropriate for | |
3509 | * future condition types. | |
3510 | */ | |
3511 | goto end; | |
3512 | } | |
3513 | ||
e8360425 JD |
3514 | if (!evaluation || !latest_sample_result) { |
3515 | goto end; | |
3516 | } | |
3517 | ||
3518 | switch (condition_type) { | |
3519 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3520 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
3521 | *evaluation = lttng_evaluation_buffer_usage_create( |
3522 | condition_type, | |
3523 | latest_sample->highest_usage, | |
e8360425 JD |
3524 | channel_info->capacity); |
3525 | break; | |
3526 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3527 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
3528 | latest_session_consumed_total); |
3529 | break; | |
3530 | default: | |
3531 | abort(); | |
3532 | } | |
3533 | ||
3534 | if (!*evaluation) { | |
3535 | ret = -1; | |
3536 | goto end; | |
ab0ee2ca JG |
3537 | } |
3538 | end: | |
3539 | return ret; | |
3540 | } | |
3541 | ||
3542 | static | |
f2b3ef9f | 3543 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 3544 | { |
f2b3ef9f JG |
3545 | int ret = 0; |
3546 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 3547 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
3548 | }; |
3549 | ||
505b2d90 JG |
3550 | ASSERT_LOCKED(client->lock); |
3551 | ||
f2b3ef9f JG |
3552 | DBG("Dropping notification addressed to client (socket fd = %i)", |
3553 | client->socket); | |
3554 | if (client->communication.outbound.dropped_notification) { | |
3555 | /* | |
3556 | * The client already has a "notification dropped" message | |
3557 | * in its outgoing queue. Nothing to do since all | |
3558 | * of those messages are coalesced. | |
3559 | */ | |
3560 | goto end; | |
3561 | } | |
3562 | ||
3563 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 3564 | ret = lttng_dynamic_buffer_append( |
882093ee | 3565 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 3566 | sizeof(msg)); |
f2b3ef9f JG |
3567 | if (ret) { |
3568 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
3569 | client->socket); | |
3570 | } | |
3571 | end: | |
ab0ee2ca JG |
3572 | return ret; |
3573 | } | |
3574 | ||
f2b3ef9f JG |
3575 | static int client_handle_transmission_status_wrapper( |
3576 | struct notification_client *client, | |
3577 | enum client_transmission_status status, | |
3578 | void *user_data) | |
3579 | { | |
3580 | return client_handle_transmission_status(client, status, | |
3581 | (struct notification_thread_state *) user_data); | |
3582 | } | |
3583 | ||
3584 | static | |
3585 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
3586 | const struct lttng_evaluation *evaluation, | |
3587 | struct notification_client_list* client_list, | |
3588 | struct notification_thread_state *state, | |
3589 | uid_t object_uid, gid_t object_gid) | |
3590 | { | |
ff588497 JR |
3591 | const struct lttng_credentials creds = { |
3592 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
3593 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
3594 | }; | |
3595 | ||
f2b3ef9f JG |
3596 | return notification_client_list_send_evaluation(client_list, |
3597 | lttng_trigger_get_const_condition(trigger), evaluation, | |
3598 | lttng_trigger_get_credentials(trigger), | |
ff588497 | 3599 | &creds, |
f2b3ef9f JG |
3600 | client_handle_transmission_status_wrapper, state); |
3601 | } | |
3602 | ||
f37d0f86 JG |
3603 | /* |
3604 | * Permission checks relative to notification channel clients are performed | |
3605 | * here. Notice how object, client, and trigger credentials are involved in | |
3606 | * this check. | |
3607 | * | |
3608 | * The `object` credentials are the credentials associated with the "subject" | |
3609 | * of a condition. For instance, a `rotation completed` condition applies | |
3610 | * to a session. When that condition is met, it will produce an evaluation | |
3611 | * against a session. Hence, in this case, the `object` credentials are the | |
3612 | * credentials of the "subject" session. | |
3613 | * | |
3614 | * The `trigger` credentials are the credentials of the user that registered the | |
3615 | * trigger. | |
3616 | * | |
3617 | * The `client` credentials are the credentials of the user that created a given | |
3618 | * notification channel. | |
3619 | * | |
3620 | * In terms of visibility, it is expected that non-privilieged users can only | |
3621 | * register triggers against "their" objects (their own sessions and | |
3622 | * applications they are allowed to interact with). They can then open a | |
3623 | * notification channel and subscribe to notifications associated with those | |
3624 | * triggers. | |
3625 | * | |
3626 | * As for privilieged users, they can register triggers against the objects of | |
3627 | * other users. They can then subscribe to the notifications associated to their | |
3628 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
3629 | * triggers owned by other users; they must create their own triggers. | |
3630 | * | |
3631 | * This is more a concern of usability than security. It would be difficult for | |
3632 | * a root user reliably subscribe to a specific set of conditions without | |
3633 | * interference from external users (those could, for instance, unregister | |
3634 | * their triggers). | |
3635 | */ | |
f2b3ef9f JG |
3636 | LTTNG_HIDDEN |
3637 | int notification_client_list_send_evaluation( | |
3638 | struct notification_client_list *client_list, | |
3639 | const struct lttng_condition *condition, | |
9b63a4aa | 3640 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
3641 | const struct lttng_credentials *trigger_creds, |
3642 | const struct lttng_credentials *source_object_creds, | |
3643 | report_client_transmission_result_cb client_report, | |
3644 | void *user_data) | |
ab0ee2ca JG |
3645 | { |
3646 | int ret = 0; | |
c0a66c84 | 3647 | struct lttng_payload msg_payload; |
ab0ee2ca | 3648 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 3649 | const struct lttng_notification notification = { |
f2b3ef9f | 3650 | .condition = (struct lttng_condition *) condition, |
9b63a4aa JG |
3651 | .evaluation = (struct lttng_evaluation *) evaluation, |
3652 | }; | |
3647288f JG |
3653 | struct lttng_notification_channel_message msg_header = { |
3654 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
3655 | }; | |
ab0ee2ca | 3656 | |
c0a66c84 | 3657 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 3658 | |
c0a66c84 | 3659 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 3660 | sizeof(msg_header)); |
ab0ee2ca JG |
3661 | if (ret) { |
3662 | goto end; | |
3663 | } | |
3664 | ||
c0a66c84 | 3665 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 3666 | if (ret) { |
ab0ee2ca JG |
3667 | ERR("[notification-thread] Failed to serialize notification"); |
3668 | ret = -1; | |
3669 | goto end; | |
3670 | } | |
3671 | ||
3647288f | 3672 | /* Update payload size. */ |
505b2d90 JG |
3673 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
3674 | ->size = (uint32_t)( | |
3675 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 3676 | |
882093ee JR |
3677 | /* Update the payload number of fds. */ |
3678 | { | |
3679 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3680 | &msg_payload, 0, -1); | |
3681 | ||
3682 | ((struct lttng_notification_channel_message *) | |
3683 | msg_payload.buffer.data)->fds = (uint32_t) | |
3684 | lttng_payload_view_get_fd_handle_count(&pv); | |
3685 | } | |
3686 | ||
505b2d90 | 3687 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
3688 | cds_list_for_each_entry_safe(client_list_element, tmp, |
3689 | &client_list->list, node) { | |
f2b3ef9f | 3690 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
3691 | struct notification_client *client = |
3692 | client_list_element->client; | |
3693 | ||
505b2d90 JG |
3694 | ret = 0; |
3695 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
3696 | if (!client->communication.active) { |
3697 | /* | |
3698 | * Skip inactive client (protocol error or | |
3699 | * disconnecting). | |
3700 | */ | |
3701 | DBG("Skipping client at it is marked as inactive"); | |
3702 | goto skip_client; | |
3703 | } | |
3704 | ||
f2b3ef9f | 3705 | if (source_object_creds) { |
ff588497 JR |
3706 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
3707 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
3708 | client->uid != 0) { |
3709 | /* | |
3710 | * Client is not allowed to monitor this | |
3711 | * object. | |
3712 | */ | |
3713 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
6c24d3fd | 3714 | goto skip_client; |
f2b3ef9f | 3715 | } |
90843f49 JR |
3716 | } |
3717 | ||
ff588497 | 3718 | if (client->uid != lttng_credentials_get_uid(trigger_creds) && client->gid != lttng_credentials_get_gid(trigger_creds)) { |
90843f49 | 3719 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 3720 | goto skip_client; |
ab0ee2ca JG |
3721 | } |
3722 | ||
3723 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
c0a66c84 | 3724 | client->socket, msg_payload.buffer.size); |
882093ee JR |
3725 | |
3726 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
3727 | /* |
3728 | * Outgoing data is already buffered for this client; | |
3729 | * drop the notification and enqueue a "dropped | |
3730 | * notification" message if this is the first dropped | |
3731 | * notification since the socket spilled-over to the | |
3732 | * queue. | |
3733 | */ | |
f2b3ef9f JG |
3734 | ret = client_notification_overflow(client); |
3735 | if (ret) { | |
6c24d3fd JG |
3736 | /* Fatal error. */ |
3737 | goto skip_client; | |
ab0ee2ca | 3738 | } |
ab0ee2ca JG |
3739 | } |
3740 | ||
882093ee | 3741 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 3742 | if (ret) { |
6c24d3fd JG |
3743 | /* Fatal error. */ |
3744 | goto skip_client; | |
ab0ee2ca JG |
3745 | } |
3746 | ||
f2b3ef9f | 3747 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 3748 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 3749 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 3750 | if (ret) { |
6c24d3fd JG |
3751 | /* Fatal error. */ |
3752 | goto end_unlock_list; | |
505b2d90 | 3753 | } |
6c24d3fd JG |
3754 | |
3755 | continue; | |
3756 | ||
3757 | skip_client: | |
505b2d90 JG |
3758 | pthread_mutex_unlock(&client->lock); |
3759 | if (ret) { | |
6c24d3fd | 3760 | /* Fatal error. */ |
505b2d90 | 3761 | goto end_unlock_list; |
ab0ee2ca JG |
3762 | } |
3763 | } | |
3764 | ret = 0; | |
505b2d90 JG |
3765 | |
3766 | end_unlock_list: | |
3767 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 3768 | end: |
c0a66c84 | 3769 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
3770 | return ret; |
3771 | } | |
3772 | ||
3773 | int handle_notification_thread_channel_sample( | |
3774 | struct notification_thread_state *state, int pipe, | |
3775 | enum lttng_domain_type domain) | |
3776 | { | |
3777 | int ret = 0; | |
3778 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
3779 | struct channel_info *channel_info; |
3780 | struct cds_lfht_node *node; | |
3781 | struct cds_lfht_iter iter; | |
3782 | struct lttng_channel_trigger_list *trigger_list; | |
3783 | struct lttng_trigger_list_element *trigger_list_element; | |
3784 | bool previous_sample_available = false; | |
e8360425 JD |
3785 | struct channel_state_sample previous_sample, latest_sample; |
3786 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 3787 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
3788 | |
3789 | /* | |
3790 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
3791 | * ensuring that read/write of sampling messages are atomic. | |
3792 | */ | |
7c2551ef | 3793 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
3794 | if (ret != sizeof(sample_msg)) { |
3795 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
3796 | pipe); | |
3797 | ret = -1; | |
3798 | goto end; | |
3799 | } | |
3800 | ||
3801 | ret = 0; | |
3802 | latest_sample.key.key = sample_msg.key; | |
3803 | latest_sample.key.domain = domain; | |
3804 | latest_sample.highest_usage = sample_msg.highest; | |
3805 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 3806 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
3807 | |
3808 | rcu_read_lock(); | |
3809 | ||
3810 | /* Retrieve the channel's informations */ | |
3811 | cds_lfht_lookup(state->channels_ht, | |
3812 | hash_channel_key(&latest_sample.key), | |
3813 | match_channel_info, | |
3814 | &latest_sample.key, | |
3815 | &iter); | |
3816 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3817 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
3818 | /* |
3819 | * Not an error since the consumer can push a sample to the pipe | |
3820 | * and the rest of the session daemon could notify us of the | |
3821 | * channel's destruction before we get a chance to process that | |
3822 | * sample. | |
3823 | */ | |
3824 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
3825 | latest_sample.key.key, | |
3826 | domain == LTTNG_DOMAIN_KERNEL ? "kernel" : | |
3827 | "user space"); | |
3828 | goto end_unlock; | |
3829 | } | |
3830 | channel_info = caa_container_of(node, struct channel_info, | |
3831 | channels_ht_node); | |
e8360425 | 3832 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 3833 | channel_info->name, |
ab0ee2ca | 3834 | latest_sample.key.key, |
8abe313a | 3835 | channel_info->session_info->name, |
ab0ee2ca | 3836 | latest_sample.highest_usage, |
e8360425 JD |
3837 | latest_sample.lowest_usage, |
3838 | latest_sample.channel_total_consumed); | |
3839 | ||
3840 | previous_session_consumed_total = | |
3841 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
3842 | |
3843 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
3844 | cds_lfht_lookup(state->channel_state_ht, | |
3845 | hash_channel_key(&latest_sample.key), | |
3846 | match_channel_state_sample, | |
3847 | &latest_sample.key, | |
3848 | &iter); | |
3849 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3850 | if (caa_likely(node)) { |
ab0ee2ca JG |
3851 | struct channel_state_sample *stored_sample; |
3852 | ||
3853 | /* Update the sample stored. */ | |
3854 | stored_sample = caa_container_of(node, | |
3855 | struct channel_state_sample, | |
3856 | channel_state_ht_node); | |
e8360425 | 3857 | |
ab0ee2ca JG |
3858 | memcpy(&previous_sample, stored_sample, |
3859 | sizeof(previous_sample)); | |
3860 | stored_sample->highest_usage = latest_sample.highest_usage; | |
3861 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 3862 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 3863 | previous_sample_available = true; |
e8360425 JD |
3864 | |
3865 | latest_session_consumed_total = | |
3866 | previous_session_consumed_total + | |
3867 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
3868 | } else { |
3869 | /* | |
3870 | * This is the channel's first sample, allocate space for and | |
3871 | * store the new sample. | |
3872 | */ | |
3873 | struct channel_state_sample *stored_sample; | |
3874 | ||
3875 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
3876 | if (!stored_sample) { | |
3877 | ret = -1; | |
3878 | goto end_unlock; | |
3879 | } | |
3880 | ||
3881 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
3882 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
3883 | cds_lfht_add(state->channel_state_ht, | |
3884 | hash_channel_key(&stored_sample->key), | |
3885 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
3886 | |
3887 | latest_session_consumed_total = | |
3888 | previous_session_consumed_total + | |
3889 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
3890 | } |
3891 | ||
e8360425 JD |
3892 | channel_info->session_info->consumed_data_size = |
3893 | latest_session_consumed_total; | |
3894 | ||
ab0ee2ca JG |
3895 | /* Find triggers associated with this channel. */ |
3896 | cds_lfht_lookup(state->channel_triggers_ht, | |
3897 | hash_channel_key(&latest_sample.key), | |
3898 | match_channel_trigger_list, | |
3899 | &latest_sample.key, | |
3900 | &iter); | |
3901 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3902 | if (caa_likely(!node)) { |
ab0ee2ca JG |
3903 | goto end_unlock; |
3904 | } | |
3905 | ||
f2b3ef9f | 3906 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
3907 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
3908 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
3909 | }; |
3910 | ||
ab0ee2ca JG |
3911 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
3912 | channel_triggers_ht_node); | |
3913 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 3914 | node) { |
9b63a4aa | 3915 | const struct lttng_condition *condition; |
f2b3ef9f | 3916 | struct lttng_trigger *trigger; |
505b2d90 | 3917 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 3918 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 3919 | enum action_executor_status executor_status; |
ab0ee2ca | 3920 | |
505b2d90 | 3921 | ret = 0; |
ab0ee2ca | 3922 | trigger = trigger_list_element->trigger; |
9b63a4aa | 3923 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 3924 | assert(condition); |
ab0ee2ca JG |
3925 | |
3926 | /* | |
3927 | * Check if any client is subscribed to the result of this | |
3928 | * evaluation. | |
3929 | */ | |
ed327204 | 3930 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 3931 | |
ed327204 | 3932 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 3933 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
3934 | &latest_sample, |
3935 | previous_session_consumed_total, | |
3936 | latest_session_consumed_total, | |
3937 | channel_info); | |
3938 | if (caa_unlikely(ret)) { | |
505b2d90 | 3939 | goto put_list; |
ab0ee2ca JG |
3940 | } |
3941 | ||
e8360425 | 3942 | if (caa_likely(!evaluation)) { |
505b2d90 | 3943 | goto put_list; |
ab0ee2ca JG |
3944 | } |
3945 | ||
f2b3ef9f JG |
3946 | /* |
3947 | * Ownership of `evaluation` transferred to the action executor | |
3948 | * no matter the result. | |
3949 | */ | |
3950 | executor_status = action_executor_enqueue(state->executor, | |
3951 | trigger, evaluation, &channel_creds, | |
3952 | client_list); | |
3953 | evaluation = NULL; | |
3954 | switch (executor_status) { | |
3955 | case ACTION_EXECUTOR_STATUS_OK: | |
3956 | break; | |
3957 | case ACTION_EXECUTOR_STATUS_ERROR: | |
3958 | case ACTION_EXECUTOR_STATUS_INVALID: | |
3959 | /* | |
3960 | * TODO Add trigger identification (name/id) when | |
3961 | * it is added to the API. | |
3962 | */ | |
3963 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
3964 | ret = -1; | |
3965 | goto put_list; | |
3966 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
3967 | /* | |
3968 | * TODO Add trigger identification (name/id) when | |
3969 | * it is added to the API. | |
3970 | * | |
3971 | * Not a fatal error. | |
3972 | */ | |
3973 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
3974 | ret = 0; | |
3975 | goto put_list; | |
3976 | default: | |
3977 | abort(); | |
3978 | } | |
3979 | ||
505b2d90 JG |
3980 | put_list: |
3981 | notification_client_list_put(client_list); | |
e0b5f87b | 3982 | if (caa_unlikely(ret)) { |
505b2d90 | 3983 | break; |
ab0ee2ca JG |
3984 | } |
3985 | } | |
3986 | end_unlock: | |
3987 | rcu_read_unlock(); | |
3988 | end: | |
3989 | return ret; | |
3990 | } |