Commit | Line | Data |
---|---|---|
0475c50c | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
0475c50c | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
0475c50c | 6 | * |
0475c50c DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
0475c50c | 10 | #include <assert.h> |
f20baf8e | 11 | #include <urcu/uatomic.h> |
bdf64013 | 12 | #include <urcu/rculist.h> |
0475c50c | 13 | |
44760c20 JR |
14 | #include <lttng/event-rule/event-rule.h> |
15 | #include <lttng/event-rule/event-rule-internal.h> | |
695f7044 JR |
16 | #include <lttng/event-rule/jul-logging.h> |
17 | #include <lttng/event-rule/log4j-logging.h> | |
18 | #include <lttng/event-rule/python-logging.h> | |
44760c20 | 19 | #include <lttng/condition/condition.h> |
670a26e4 | 20 | #include <lttng/condition/event-rule-matches.h> |
44760c20 | 21 | #include <lttng/domain-internal.h> |
85b05318 | 22 | #include <lttng/log-level-rule-internal.h> |
44760c20 | 23 | |
0475c50c | 24 | #include <common/common.h> |
022d91ba | 25 | #include <common/sessiond-comm/agent.h> |
0475c50c | 26 | |
f263b7fd JD |
27 | #include <common/compat/endian.h> |
28 | ||
022d91ba | 29 | #include "agent.h" |
f20baf8e | 30 | #include "ust-app.h" |
0475c50c | 31 | #include "utils.h" |
6712db61 | 32 | #include "common/error.h" |
23c2bd47 JG |
33 | |
34 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) | |
35 | ||
695f7044 JR |
36 | typedef enum lttng_event_rule_status (*event_rule_logging_get_name_pattern)( |
37 | const struct lttng_event_rule *rule, const char **pattern); | |
38 | typedef enum lttng_event_rule_status (*event_rule_logging_get_log_level_rule)( | |
39 | const struct lttng_event_rule *rule, | |
40 | const struct lttng_log_level_rule **log_level_rule); | |
41 | ||
bdf64013 JG |
42 | /* |
43 | * Agent application context representation. | |
44 | */ | |
45 | struct agent_app_ctx { | |
46 | char *provider_name; | |
47 | char *ctx_name; | |
48 | ||
49 | /* agent_app_ctx are part of the agent app_ctx_list. */ | |
50 | struct cds_list_head list_node; | |
51 | ||
52 | /* For call_rcu teardown. */ | |
53 | struct rcu_head rcu_node; | |
54 | }; | |
55 | ||
23c2bd47 JG |
56 | /* |
57 | * Human readable agent return code. | |
58 | */ | |
59 | static const char *error_string_array[] = { | |
60 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
61 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
62 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
63 | ||
64 | /* Last element */ | |
65 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
66 | }; | |
67 | ||
68 | static | |
69 | void log_reply_code(uint32_t in_reply_ret_code) | |
70 | { | |
71 | int level = PRINT_DBG3; | |
72 | /* | |
73 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
74 | * sanitized value (used to retrieve the human readable string) and the | |
75 | * original value which is logged as-is. | |
76 | */ | |
77 | uint32_t reply_ret_code = in_reply_ret_code; | |
78 | ||
79 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
80 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
81 | reply_ret_code = AGENT_RET_CODE_NR; | |
82 | level = PRINT_ERR; | |
83 | } | |
84 | ||
85 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
86 | error_string_array[AGENT_RET_CODE_INDEX( | |
87 | reply_ret_code)], | |
88 | in_reply_ret_code); | |
89 | } | |
0475c50c | 90 | |
4a4ab2c3 DG |
91 | /* |
92 | * Match function for the events hash table lookup by name. | |
93 | */ | |
94 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
95 | const void *_key) | |
96 | { | |
022d91ba DG |
97 | struct agent_event *event; |
98 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
99 | |
100 | assert(node); | |
101 | assert(_key); | |
102 | ||
022d91ba | 103 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
104 | key = _key; |
105 | ||
106 | /* Match 1 elements of the key: name. */ | |
107 | ||
108 | /* Event name */ | |
109 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
110 | goto no_match; | |
111 | } | |
112 | /* Match. */ | |
113 | return 1; | |
114 | ||
115 | no_match: | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* | |
44760c20 JR |
120 | * Match function for the events hash table lookup by name, log level and |
121 | * filter expression. | |
4a4ab2c3 DG |
122 | */ |
123 | static int ht_match_event(struct cds_lfht_node *node, | |
124 | const void *_key) | |
125 | { | |
022d91ba DG |
126 | struct agent_event *event; |
127 | const struct agent_ht_key *key; | |
19a97244 | 128 | int ll_match; |
4a4ab2c3 DG |
129 | |
130 | assert(node); | |
131 | assert(_key); | |
132 | ||
022d91ba | 133 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
134 | key = _key; |
135 | ||
136 | /* Match 2 elements of the key: name and loglevel. */ | |
137 | ||
138 | /* Event name */ | |
139 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
140 | goto no_match; | |
141 | } | |
142 | ||
a9319624 | 143 | /* Event loglevel value and type. */ |
19a97244 PP |
144 | ll_match = loglevels_match(event->loglevel_type, |
145 | event->loglevel_value, key->loglevel_type, | |
146 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
147 | ||
148 | if (!ll_match) { | |
4a4ab2c3 DG |
149 | goto no_match; |
150 | } | |
a9319624 | 151 | |
6b10b3b0 | 152 | /* Filter expression */ |
d42bc3c8 | 153 | if (!!event->filter_expression != !!key->filter_expression) { |
71e147d0 | 154 | /* One has a filter expression, the other does not */ |
6b10b3b0 AM |
155 | goto no_match; |
156 | } | |
157 | ||
71e147d0 PP |
158 | if (event->filter_expression) { |
159 | if (strncmp(event->filter_expression, key->filter_expression, | |
160 | strlen(event->filter_expression)) != 0) { | |
161 | goto no_match; | |
162 | } | |
163 | } | |
164 | ||
4a4ab2c3 DG |
165 | return 1; |
166 | ||
167 | no_match: | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /* | |
022d91ba | 172 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 173 | */ |
022d91ba DG |
174 | static void add_unique_agent_event(struct lttng_ht *ht, |
175 | struct agent_event *event) | |
4a4ab2c3 DG |
176 | { |
177 | struct cds_lfht_node *node_ptr; | |
022d91ba | 178 | struct agent_ht_key key; |
4a4ab2c3 DG |
179 | |
180 | assert(ht); | |
181 | assert(ht->ht); | |
182 | assert(event); | |
183 | ||
184 | key.name = event->name; | |
2106efa0 | 185 | key.loglevel_value = event->loglevel_value; |
a9319624 | 186 | key.loglevel_type = event->loglevel_type; |
6b10b3b0 | 187 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
188 | |
189 | node_ptr = cds_lfht_add_unique(ht->ht, | |
190 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
191 | ht_match_event, &key, &event->node.node); | |
192 | assert(node_ptr == &event->node.node); | |
193 | } | |
194 | ||
0475c50c | 195 | /* |
022d91ba | 196 | * URCU delayed agent event reclaim. |
0475c50c | 197 | */ |
022d91ba | 198 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
199 | { |
200 | struct lttng_ht_node_str *node = | |
201 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
202 | struct agent_event *event = |
203 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 204 | |
992febc7 | 205 | agent_destroy_event(event); |
0475c50c DG |
206 | } |
207 | ||
f20baf8e | 208 | /* |
022d91ba | 209 | * URCU delayed agent app reclaim. |
f20baf8e | 210 | */ |
022d91ba | 211 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
212 | { |
213 | struct lttng_ht_node_ulong *node = | |
214 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
215 | struct agent_app *app = |
216 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
217 | |
218 | free(app); | |
219 | } | |
220 | ||
221 | /* | |
022d91ba DG |
222 | * Communication with the agent. Send the message header to the given socket in |
223 | * big endian. | |
f20baf8e DG |
224 | * |
225 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
226 | */ | |
227 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
228 | uint32_t cmd, uint32_t cmd_version) | |
229 | { | |
230 | int ret; | |
231 | ssize_t size; | |
022d91ba | 232 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
233 | |
234 | assert(sock); | |
235 | ||
53efb85a | 236 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
237 | msg.data_size = htobe64(data_size); |
238 | msg.cmd = htobe32(cmd); | |
239 | msg.cmd_version = htobe32(cmd_version); | |
240 | ||
241 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
242 | if (size < sizeof(msg)) { | |
243 | ret = -errno; | |
244 | goto error; | |
245 | } | |
246 | ret = 0; | |
247 | ||
248 | error: | |
249 | return ret; | |
250 | } | |
251 | ||
252 | /* | |
022d91ba DG |
253 | * Communication call with the agent. Send the payload to the given socket. The |
254 | * header MUST be sent prior to this call. | |
f20baf8e DG |
255 | * |
256 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
257 | */ | |
bdf64013 | 258 | static int send_payload(struct lttcomm_sock *sock, const void *data, |
f20baf8e DG |
259 | size_t size) |
260 | { | |
261 | int ret; | |
262 | ssize_t len; | |
263 | ||
264 | assert(sock); | |
265 | assert(data); | |
266 | ||
267 | len = sock->ops->sendmsg(sock, data, size, 0); | |
268 | if (len < size) { | |
269 | ret = -errno; | |
270 | goto error; | |
271 | } | |
272 | ret = 0; | |
273 | ||
274 | error: | |
275 | return ret; | |
276 | } | |
277 | ||
278 | /* | |
022d91ba DG |
279 | * Communication call with the agent. Receive reply from the agent using the |
280 | * given socket. | |
f20baf8e DG |
281 | * |
282 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
283 | */ | |
284 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
285 | { | |
286 | int ret; | |
287 | ssize_t len; | |
288 | ||
289 | assert(sock); | |
290 | assert(buf); | |
291 | ||
292 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
293 | if (len < size) { | |
294 | ret = -errno; | |
295 | goto error; | |
296 | } | |
297 | ret = 0; | |
298 | ||
299 | error: | |
300 | return ret; | |
301 | } | |
302 | ||
3c6a091f | 303 | /* |
428de77a | 304 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
305 | * |
306 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
307 | * On success, the caller is responsible for freeing the memory |
308 | * allocated for "events". | |
3c6a091f | 309 | */ |
022d91ba | 310 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
311 | { |
312 | int ret, i, len = 0, offset = 0; | |
313 | uint32_t nb_event; | |
314 | size_t data_size; | |
d84af1a4 | 315 | uint32_t reply_ret_code; |
3c6a091f | 316 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
317 | struct lttcomm_agent_list_reply *reply = NULL; |
318 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
319 | |
320 | assert(app); | |
321 | assert(app->sock); | |
322 | assert(events); | |
323 | ||
022d91ba | 324 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
325 | app->sock->fd); |
326 | ||
022d91ba | 327 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
328 | if (ret < 0) { |
329 | goto error_io; | |
330 | } | |
331 | ||
332 | /* Get list header so we know how much we'll receive. */ | |
333 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
334 | if (ret < 0) { | |
335 | goto error_io; | |
336 | } | |
337 | ||
d84af1a4 JG |
338 | reply_ret_code = be32toh(reply_hdr.ret_code); |
339 | log_reply_code(reply_ret_code); | |
340 | switch (reply_ret_code) { | |
022d91ba | 341 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
342 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
343 | break; | |
344 | default: | |
3bd9aaeb | 345 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
346 | goto error; |
347 | } | |
348 | ||
349 | reply = zmalloc(data_size); | |
350 | if (!reply) { | |
351 | ret = LTTNG_ERR_NOMEM; | |
352 | goto error; | |
353 | } | |
354 | ||
355 | /* Get the list with the appropriate data size. */ | |
356 | ret = recv_reply(app->sock, reply, data_size); | |
357 | if (ret < 0) { | |
358 | goto error_io; | |
359 | } | |
360 | ||
361 | nb_event = be32toh(reply->nb_event); | |
362 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
363 | if (!tmp_events) { | |
364 | ret = LTTNG_ERR_NOMEM; | |
365 | goto error; | |
366 | } | |
367 | ||
368 | for (i = 0; i < nb_event; i++) { | |
369 | offset += len; | |
0a85e7a3 MD |
370 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
371 | sizeof(tmp_events[i].name))) { | |
372 | ret = LTTNG_ERR_INVALID; | |
373 | goto error; | |
374 | } | |
3c6a091f DG |
375 | tmp_events[i].pid = app->pid; |
376 | tmp_events[i].enabled = -1; | |
377 | len = strlen(reply->payload + offset) + 1; | |
378 | } | |
379 | ||
380 | *events = tmp_events; | |
381 | ||
382 | free(reply); | |
383 | return nb_event; | |
384 | ||
385 | error_io: | |
386 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
387 | error: | |
388 | free(reply); | |
389 | free(tmp_events); | |
390 | return -ret; | |
391 | ||
392 | } | |
393 | ||
f20baf8e | 394 | /* |
022d91ba DG |
395 | * Internal enable agent event on a agent application. This function |
396 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
397 | * |
398 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
399 | */ | |
733c9165 | 400 | static int enable_event(const struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
401 | { |
402 | int ret; | |
a0ba721c | 403 | char *bytes_to_send; |
f20baf8e | 404 | uint64_t data_size; |
a0ba721c | 405 | size_t filter_expression_length; |
f4f9d4db | 406 | uint32_t reply_ret_code; |
bdf64013 | 407 | struct lttcomm_agent_enable_event msg; |
022d91ba | 408 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
409 | |
410 | assert(app); | |
411 | assert(app->sock); | |
412 | assert(event); | |
413 | ||
022d91ba | 414 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
415 | app->pid, app->sock->fd); |
416 | ||
a0ba721c AM |
417 | /* |
418 | * Calculate the payload's size, which is the fixed-size struct followed | |
419 | * by the variable-length filter expression (+1 for the ending \0). | |
420 | */ | |
421 | if (!event->filter_expression) { | |
422 | filter_expression_length = 0; | |
423 | } else { | |
424 | filter_expression_length = strlen(event->filter_expression) + 1; | |
425 | } | |
426 | data_size = sizeof(msg) + filter_expression_length; | |
f20baf8e | 427 | |
53efb85a | 428 | memset(&msg, 0, sizeof(msg)); |
a9bfd666 JG |
429 | msg.loglevel_value = htobe32(event->loglevel_value); |
430 | msg.loglevel_type = htobe32(event->loglevel_type); | |
bb45c03e MD |
431 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { |
432 | ret = LTTNG_ERR_INVALID; | |
433 | goto error; | |
434 | } | |
a9bfd666 | 435 | msg.filter_expression_length = htobe32(filter_expression_length); |
a0ba721c | 436 | |
bb45c03e MD |
437 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
438 | if (ret < 0) { | |
439 | goto error_io; | |
440 | } | |
441 | ||
a0ba721c AM |
442 | bytes_to_send = zmalloc(data_size); |
443 | if (!bytes_to_send) { | |
444 | ret = LTTNG_ERR_NOMEM; | |
445 | goto error; | |
446 | } | |
447 | ||
448 | memcpy(bytes_to_send, &msg, sizeof(msg)); | |
449 | if (filter_expression_length > 0) { | |
450 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, | |
451 | filter_expression_length); | |
452 | } | |
453 | ||
454 | ret = send_payload(app->sock, bytes_to_send, data_size); | |
455 | free(bytes_to_send); | |
f20baf8e DG |
456 | if (ret < 0) { |
457 | goto error_io; | |
458 | } | |
459 | ||
460 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
461 | if (ret < 0) { | |
462 | goto error_io; | |
463 | } | |
464 | ||
f4f9d4db JG |
465 | reply_ret_code = be32toh(reply.ret_code); |
466 | log_reply_code(reply_ret_code); | |
467 | switch (reply_ret_code) { | |
022d91ba | 468 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 469 | break; |
022d91ba | 470 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
471 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
472 | goto error; | |
473 | default: | |
3bd9aaeb | 474 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
475 | goto error; |
476 | } | |
477 | ||
478 | return LTTNG_OK; | |
479 | ||
480 | error_io: | |
481 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
482 | error: | |
483 | return ret; | |
484 | } | |
485 | ||
bdf64013 JG |
486 | /* |
487 | * Send Pascal-style string. Size is sent as a 32-bit big endian integer. | |
488 | */ | |
489 | static | |
490 | int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len) | |
491 | { | |
492 | int ret; | |
493 | uint32_t len_be; | |
494 | ||
495 | len_be = htobe32(len); | |
496 | ret = send_payload(sock, &len_be, sizeof(len_be)); | |
497 | if (ret) { | |
498 | goto end; | |
499 | } | |
500 | ||
501 | ret = send_payload(sock, str, len); | |
502 | if (ret) { | |
503 | goto end; | |
504 | } | |
505 | end: | |
506 | return ret; | |
507 | } | |
508 | ||
509 | /* | |
510 | * Internal enable application context on an agent application. This function | |
511 | * communicates with the agent to enable a given application context. | |
512 | * | |
513 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
514 | */ | |
733c9165 JG |
515 | static int app_context_op(const struct agent_app *app, |
516 | const struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd) | |
bdf64013 JG |
517 | { |
518 | int ret; | |
519 | uint32_t reply_ret_code; | |
520 | struct lttcomm_agent_generic_reply reply; | |
521 | size_t app_ctx_provider_name_len, app_ctx_name_len, data_size; | |
522 | ||
523 | assert(app); | |
524 | assert(app->sock); | |
525 | assert(ctx); | |
526 | assert(cmd == AGENT_CMD_APP_CTX_ENABLE || | |
527 | cmd == AGENT_CMD_APP_CTX_DISABLE); | |
528 | ||
529 | DBG2("Agent %s application %s:%s for app pid: %d and socket %d", | |
530 | cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling", | |
531 | ctx->provider_name, ctx->ctx_name, | |
532 | app->pid, app->sock->fd); | |
533 | ||
534 | /* | |
535 | * Calculate the payload's size, which consists of the size (u32, BE) | |
536 | * of the provider name, the NULL-terminated provider name string, the | |
537 | * size (u32, BE) of the context name, followed by the NULL-terminated | |
538 | * context name string. | |
539 | */ | |
540 | app_ctx_provider_name_len = strlen(ctx->provider_name) + 1; | |
541 | app_ctx_name_len = strlen(ctx->ctx_name) + 1; | |
542 | data_size = sizeof(uint32_t) + app_ctx_provider_name_len + | |
543 | sizeof(uint32_t) + app_ctx_name_len; | |
544 | ||
545 | ret = send_header(app->sock, data_size, cmd, 0); | |
546 | if (ret < 0) { | |
547 | goto error_io; | |
548 | } | |
549 | ||
550 | if (app_ctx_provider_name_len > UINT32_MAX || | |
551 | app_ctx_name_len > UINT32_MAX) { | |
552 | ERR("Application context name > MAX_UINT32"); | |
553 | ret = LTTNG_ERR_INVALID; | |
554 | goto error; | |
555 | } | |
556 | ||
557 | ret = send_pstring(app->sock, ctx->provider_name, | |
558 | (uint32_t) app_ctx_provider_name_len); | |
559 | if (ret < 0) { | |
560 | goto error_io; | |
561 | } | |
562 | ||
563 | ret = send_pstring(app->sock, ctx->ctx_name, | |
564 | (uint32_t) app_ctx_name_len); | |
565 | if (ret < 0) { | |
566 | goto error_io; | |
567 | } | |
568 | ||
569 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
570 | if (ret < 0) { | |
571 | goto error_io; | |
572 | } | |
573 | ||
574 | reply_ret_code = be32toh(reply.ret_code); | |
575 | log_reply_code(reply_ret_code); | |
576 | switch (reply_ret_code) { | |
577 | case AGENT_RET_CODE_SUCCESS: | |
578 | break; | |
579 | default: | |
580 | ret = LTTNG_ERR_UNK; | |
581 | goto error; | |
582 | } | |
583 | ||
584 | return LTTNG_OK; | |
585 | ||
586 | error_io: | |
587 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
588 | error: | |
589 | return ret; | |
590 | } | |
591 | ||
f20baf8e | 592 | /* |
022d91ba DG |
593 | * Internal disable agent event call on a agent application. This function |
594 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
595 | * |
596 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
597 | */ | |
022d91ba | 598 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
599 | { |
600 | int ret; | |
601 | uint64_t data_size; | |
517992f8 | 602 | uint32_t reply_ret_code; |
bdf64013 | 603 | struct lttcomm_agent_disable_event msg; |
022d91ba | 604 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
605 | |
606 | assert(app); | |
607 | assert(app->sock); | |
608 | assert(event); | |
609 | ||
022d91ba | 610 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
611 | app->pid, app->sock->fd); |
612 | ||
613 | data_size = sizeof(msg); | |
63be730a MD |
614 | memset(&msg, 0, sizeof(msg)); |
615 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
616 | ret = LTTNG_ERR_INVALID; | |
617 | goto error; | |
618 | } | |
f20baf8e | 619 | |
022d91ba | 620 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
621 | if (ret < 0) { |
622 | goto error_io; | |
623 | } | |
624 | ||
f20baf8e DG |
625 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
626 | if (ret < 0) { | |
627 | goto error_io; | |
628 | } | |
629 | ||
630 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
631 | if (ret < 0) { | |
632 | goto error_io; | |
633 | } | |
634 | ||
517992f8 JG |
635 | reply_ret_code = be32toh(reply.ret_code); |
636 | log_reply_code(reply_ret_code); | |
637 | switch (reply_ret_code) { | |
022d91ba DG |
638 | case AGENT_RET_CODE_SUCCESS: |
639 | break; | |
640 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
641 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
642 | goto error; | |
643 | default: | |
3bd9aaeb | 644 | ret = LTTNG_ERR_UNK; |
022d91ba | 645 | goto error; |
f20baf8e DG |
646 | } |
647 | ||
648 | return LTTNG_OK; | |
649 | ||
650 | error_io: | |
651 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
652 | error: | |
653 | return ret; | |
654 | } | |
655 | ||
1b500e7a | 656 | /* |
022d91ba | 657 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
658 | * |
659 | * Return 0 on success or else a negative value. | |
660 | */ | |
022d91ba | 661 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
662 | { |
663 | assert(app); | |
664 | assert(app->sock); | |
665 | ||
022d91ba | 666 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 667 | |
b26d1f5c | 668 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
669 | } |
670 | ||
f20baf8e | 671 | /* |
022d91ba | 672 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
673 | * daemon. |
674 | * | |
675 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
676 | */ | |
fefd409b DG |
677 | int agent_enable_event(struct agent_event *event, |
678 | enum lttng_domain_type domain) | |
f20baf8e DG |
679 | { |
680 | int ret; | |
022d91ba | 681 | struct agent_app *app; |
f20baf8e DG |
682 | struct lttng_ht_iter iter; |
683 | ||
684 | assert(event); | |
685 | ||
686 | rcu_read_lock(); | |
687 | ||
412d7227 | 688 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 689 | node.node) { |
fefd409b DG |
690 | if (app->domain != domain) { |
691 | continue; | |
692 | } | |
693 | ||
022d91ba | 694 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
695 | ret = enable_event(app, event); |
696 | if (ret != LTTNG_OK) { | |
697 | goto error; | |
698 | } | |
f20baf8e DG |
699 | } |
700 | ||
44760c20 | 701 | event->enabled_count++; |
f20baf8e DG |
702 | ret = LTTNG_OK; |
703 | ||
704 | error: | |
705 | rcu_read_unlock(); | |
706 | return ret; | |
707 | } | |
708 | ||
bdf64013 JG |
709 | static |
710 | void destroy_app_ctx(struct agent_app_ctx *ctx) | |
711 | { | |
712 | free(ctx->provider_name); | |
713 | free(ctx->ctx_name); | |
714 | free(ctx); | |
715 | } | |
716 | ||
717 | static | |
df4f5a87 | 718 | struct agent_app_ctx *create_app_ctx(const struct lttng_event_context *ctx) |
bdf64013 JG |
719 | { |
720 | struct agent_app_ctx *agent_ctx = NULL; | |
721 | ||
722 | if (!ctx) { | |
723 | goto end; | |
724 | } | |
725 | ||
726 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
727 | agent_ctx = zmalloc(sizeof(*ctx)); | |
728 | if (!agent_ctx) { | |
729 | goto end; | |
730 | } | |
731 | ||
732 | agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name); | |
733 | agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name); | |
734 | if (!agent_ctx->provider_name || !agent_ctx->ctx_name) { | |
735 | destroy_app_ctx(agent_ctx); | |
736 | agent_ctx = NULL; | |
737 | } | |
738 | end: | |
739 | return agent_ctx; | |
740 | } | |
741 | ||
742 | /* | |
743 | * Enable agent context on every agent applications registered with the session | |
744 | * daemon. | |
745 | * | |
746 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
747 | */ | |
df4f5a87 | 748 | int agent_enable_context(const struct lttng_event_context *ctx, |
bdf64013 JG |
749 | enum lttng_domain_type domain) |
750 | { | |
751 | int ret; | |
752 | struct agent_app *app; | |
753 | struct lttng_ht_iter iter; | |
754 | ||
755 | assert(ctx); | |
756 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
757 | ret = LTTNG_ERR_INVALID; | |
758 | goto error; | |
759 | } | |
760 | ||
761 | rcu_read_lock(); | |
762 | ||
412d7227 | 763 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
bdf64013 JG |
764 | node.node) { |
765 | struct agent_app_ctx *agent_ctx; | |
766 | ||
767 | if (app->domain != domain) { | |
768 | continue; | |
769 | } | |
770 | ||
771 | agent_ctx = create_app_ctx(ctx); | |
772 | if (!agent_ctx) { | |
a33c2651 | 773 | ret = LTTNG_ERR_NOMEM; |
bdf64013 JG |
774 | goto error_unlock; |
775 | } | |
776 | ||
777 | /* Enable event on agent application through TCP socket. */ | |
778 | ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); | |
c12618b5 | 779 | destroy_app_ctx(agent_ctx); |
bdf64013 | 780 | if (ret != LTTNG_OK) { |
bdf64013 JG |
781 | goto error_unlock; |
782 | } | |
783 | } | |
784 | ||
785 | ret = LTTNG_OK; | |
786 | ||
787 | error_unlock: | |
788 | rcu_read_unlock(); | |
789 | error: | |
790 | return ret; | |
791 | } | |
792 | ||
f20baf8e | 793 | /* |
bdf64013 | 794 | * Disable agent event on every agent application registered with the session |
f20baf8e DG |
795 | * daemon. |
796 | * | |
797 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
798 | */ | |
fefd409b DG |
799 | int agent_disable_event(struct agent_event *event, |
800 | enum lttng_domain_type domain) | |
f20baf8e | 801 | { |
f1bc0129 | 802 | int ret = LTTNG_OK; |
022d91ba | 803 | struct agent_app *app; |
f20baf8e DG |
804 | struct lttng_ht_iter iter; |
805 | ||
806 | assert(event); | |
44760c20 JR |
807 | if (!AGENT_EVENT_IS_ENABLED(event)) { |
808 | goto end; | |
809 | } | |
810 | ||
811 | if (--event->enabled_count != 0) { | |
812 | /* | |
813 | * Agent event still enabled. Disable the agent event only when | |
814 | * all "users" have disabled it (event notifiers, event rules, | |
815 | * etc.). | |
816 | */ | |
817 | ret = LTTNG_OK; | |
f1bc0129 JG |
818 | goto end; |
819 | } | |
f20baf8e DG |
820 | |
821 | rcu_read_lock(); | |
822 | ||
412d7227 | 823 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 824 | node.node) { |
fefd409b DG |
825 | if (app->domain != domain) { |
826 | continue; | |
827 | } | |
828 | ||
022d91ba | 829 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
830 | ret = disable_event(app, event); |
831 | if (ret != LTTNG_OK) { | |
832 | goto error; | |
833 | } | |
f20baf8e DG |
834 | } |
835 | ||
44760c20 JR |
836 | /* event->enabled_count is now 0. */ |
837 | assert(!AGENT_EVENT_IS_ENABLED(event)); | |
f20baf8e DG |
838 | |
839 | error: | |
840 | rcu_read_unlock(); | |
f1bc0129 | 841 | end: |
f20baf8e DG |
842 | return ret; |
843 | } | |
844 | ||
bdf64013 JG |
845 | /* |
846 | * Disable agent context on every agent application registered with the session | |
847 | * daemon. | |
848 | * | |
849 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
850 | */ | |
46440d0c SM |
851 | static int disable_context(struct agent_app_ctx *ctx, |
852 | enum lttng_domain_type domain) | |
bdf64013 JG |
853 | { |
854 | int ret = LTTNG_OK; | |
855 | struct agent_app *app; | |
856 | struct lttng_ht_iter iter; | |
857 | ||
858 | assert(ctx); | |
859 | ||
860 | rcu_read_lock(); | |
861 | DBG2("Disabling agent application context %s:%s", | |
862 | ctx->provider_name, ctx->ctx_name); | |
412d7227 | 863 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
bdf64013 JG |
864 | node.node) { |
865 | if (app->domain != domain) { | |
866 | continue; | |
867 | } | |
868 | ||
869 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); | |
870 | if (ret != LTTNG_OK) { | |
871 | goto end; | |
872 | } | |
873 | } | |
874 | end: | |
875 | rcu_read_unlock(); | |
876 | return ret; | |
877 | } | |
878 | ||
f20baf8e | 879 | /* |
022d91ba DG |
880 | * Ask every agent for the list of possible event. Events is allocated with the |
881 | * events of every agent application. | |
f20baf8e DG |
882 | * |
883 | * Return the number of events or else a negative value. | |
884 | */ | |
f60140a1 DG |
885 | int agent_list_events(struct lttng_event **events, |
886 | enum lttng_domain_type domain) | |
f20baf8e DG |
887 | { |
888 | int ret; | |
889 | size_t nbmem, count = 0; | |
022d91ba | 890 | struct agent_app *app; |
aae6255e | 891 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
892 | struct lttng_ht_iter iter; |
893 | ||
894 | assert(events); | |
895 | ||
0e115563 DG |
896 | DBG2("Agent listing events for domain %d", domain); |
897 | ||
f20baf8e DG |
898 | nbmem = UST_APP_EVENT_LIST_SIZE; |
899 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
900 | if (!tmp_events) { | |
022d91ba | 901 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
902 | ret = -ENOMEM; |
903 | goto error; | |
904 | } | |
905 | ||
906 | rcu_read_lock(); | |
412d7227 | 907 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
908 | node.node) { |
909 | ssize_t nb_ev; | |
022d91ba | 910 | struct lttng_event *agent_events; |
f20baf8e | 911 | |
f60140a1 DG |
912 | /* Skip domain not asked by the list. */ |
913 | if (app->domain != domain) { | |
914 | continue; | |
915 | } | |
916 | ||
022d91ba | 917 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
918 | if (nb_ev < 0) { |
919 | ret = nb_ev; | |
428de77a | 920 | goto error_unlock; |
f20baf8e DG |
921 | } |
922 | ||
53efb85a | 923 | if (count + nb_ev > nbmem) { |
f20baf8e | 924 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
925 | struct lttng_event *new_tmp_events; |
926 | size_t new_nbmem; | |
927 | ||
928 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 929 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
930 | nbmem, new_nbmem); |
931 | new_tmp_events = realloc(tmp_events, | |
932 | new_nbmem * sizeof(*new_tmp_events)); | |
933 | if (!new_tmp_events) { | |
022d91ba | 934 | PERROR("realloc agent events"); |
f20baf8e | 935 | ret = -ENOMEM; |
022d91ba | 936 | free(agent_events); |
428de77a | 937 | goto error_unlock; |
f20baf8e | 938 | } |
53efb85a MD |
939 | /* Zero the new memory */ |
940 | memset(new_tmp_events + nbmem, 0, | |
941 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
942 | nbmem = new_nbmem; | |
943 | tmp_events = new_tmp_events; | |
f20baf8e | 944 | } |
022d91ba | 945 | memcpy(tmp_events + count, agent_events, |
53efb85a | 946 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 947 | free(agent_events); |
f20baf8e DG |
948 | count += nb_ev; |
949 | } | |
950 | rcu_read_unlock(); | |
951 | ||
952 | ret = count; | |
953 | *events = tmp_events; | |
aae6255e | 954 | return ret; |
f20baf8e | 955 | |
428de77a MD |
956 | error_unlock: |
957 | rcu_read_unlock(); | |
f20baf8e | 958 | error: |
aae6255e | 959 | free(tmp_events); |
f20baf8e DG |
960 | return ret; |
961 | } | |
962 | ||
963 | /* | |
022d91ba | 964 | * Create a agent app object using the given PID. |
f20baf8e DG |
965 | * |
966 | * Return newly allocated object or else NULL on error. | |
967 | */ | |
fefd409b DG |
968 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
969 | struct lttcomm_sock *sock) | |
f20baf8e | 970 | { |
022d91ba | 971 | struct agent_app *app; |
f20baf8e DG |
972 | |
973 | assert(sock); | |
974 | ||
975 | app = zmalloc(sizeof(*app)); | |
976 | if (!app) { | |
733c9165 | 977 | PERROR("Failed to allocate agent application instance"); |
f20baf8e DG |
978 | goto error; |
979 | } | |
980 | ||
981 | app->pid = pid; | |
fefd409b | 982 | app->domain = domain; |
f20baf8e | 983 | app->sock = sock; |
f20baf8e DG |
984 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
985 | ||
986 | error: | |
987 | return app; | |
988 | } | |
989 | ||
990 | /* | |
022d91ba | 991 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
992 | * |
993 | * RCU read side lock MUST be acquired. | |
994 | * | |
995 | * Return object if found else NULL. | |
996 | */ | |
022d91ba | 997 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
998 | { |
999 | struct lttng_ht_node_ulong *node; | |
1000 | struct lttng_ht_iter iter; | |
022d91ba | 1001 | struct agent_app *app; |
f20baf8e DG |
1002 | |
1003 | assert(sock >= 0); | |
1004 | ||
412d7227 SM |
1005 | lttng_ht_lookup(the_agent_apps_ht_by_sock, |
1006 | (void *) ((unsigned long) sock), &iter); | |
f20baf8e DG |
1007 | node = lttng_ht_iter_get_node_ulong(&iter); |
1008 | if (node == NULL) { | |
1009 | goto error; | |
1010 | } | |
022d91ba | 1011 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 1012 | |
022d91ba | 1013 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
1014 | return app; |
1015 | ||
1016 | error: | |
022d91ba | 1017 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
1018 | return NULL; |
1019 | } | |
1020 | ||
1021 | /* | |
022d91ba | 1022 | * Add agent application object to the global hash table. |
f20baf8e | 1023 | */ |
022d91ba | 1024 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
1025 | { |
1026 | assert(app); | |
1027 | ||
022d91ba | 1028 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
412d7227 | 1029 | lttng_ht_add_unique_ulong(the_agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
1030 | } |
1031 | ||
f20baf8e | 1032 | /* |
022d91ba | 1033 | * Delete agent application from the global hash table. |
d558f236 JG |
1034 | * |
1035 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 1036 | */ |
022d91ba | 1037 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
1038 | { |
1039 | int ret; | |
1040 | struct lttng_ht_iter iter; | |
1041 | ||
1042 | assert(app); | |
1043 | ||
022d91ba | 1044 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
1045 | |
1046 | iter.iter.node = &app->node.node; | |
412d7227 | 1047 | ret = lttng_ht_del(the_agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
1048 | assert(!ret); |
1049 | } | |
1050 | ||
1051 | /* | |
e785906c | 1052 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 1053 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 1054 | * delayed memory reclaim. |
f20baf8e | 1055 | */ |
022d91ba | 1056 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
1057 | { |
1058 | assert(app); | |
1059 | ||
1060 | if (app->sock) { | |
1061 | app->sock->ops->close(app->sock); | |
1062 | lttcomm_destroy_sock(app->sock); | |
1063 | } | |
1064 | ||
022d91ba | 1065 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
1066 | } |
1067 | ||
0475c50c | 1068 | /* |
022d91ba | 1069 | * Initialize an already allocated agent object. |
0475c50c DG |
1070 | * |
1071 | * Return 0 on success or else a negative errno value. | |
1072 | */ | |
022d91ba | 1073 | int agent_init(struct agent *agt) |
0475c50c DG |
1074 | { |
1075 | int ret; | |
1076 | ||
022d91ba | 1077 | assert(agt); |
0475c50c | 1078 | |
022d91ba DG |
1079 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
1080 | if (!agt->events) { | |
0475c50c DG |
1081 | ret = -ENOMEM; |
1082 | goto error; | |
1083 | } | |
fefd409b | 1084 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c | 1085 | |
bdf64013 | 1086 | CDS_INIT_LIST_HEAD(&agt->app_ctx_list); |
0475c50c DG |
1087 | return 0; |
1088 | ||
1089 | error: | |
1090 | return ret; | |
1091 | } | |
1092 | ||
fefd409b DG |
1093 | /* |
1094 | * Add agent object to the given hash table. | |
1095 | */ | |
1096 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
1097 | { | |
1098 | assert(agt); | |
1099 | assert(ht); | |
1100 | ||
1101 | DBG3("Agent adding from domain %d", agt->domain); | |
1102 | ||
fefd409b | 1103 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
1104 | } |
1105 | ||
1106 | /* | |
1107 | * Create an agent object for the given domain. | |
1108 | * | |
1109 | * Return the allocated agent or NULL on error. | |
1110 | */ | |
1111 | struct agent *agent_create(enum lttng_domain_type domain) | |
1112 | { | |
1113 | int ret; | |
1114 | struct agent *agt; | |
1115 | ||
3b5f70d4 | 1116 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
1117 | if (!agt) { |
1118 | goto error; | |
1119 | } | |
1120 | agt->domain = domain; | |
1121 | ||
1122 | ret = agent_init(agt); | |
1123 | if (ret < 0) { | |
1124 | free(agt); | |
988ae332 | 1125 | agt = NULL; |
fefd409b DG |
1126 | goto error; |
1127 | } | |
1128 | ||
1129 | error: | |
1130 | return agt; | |
1131 | } | |
1132 | ||
0475c50c | 1133 | /* |
51755dc8 JG |
1134 | * Create a newly allocated agent event data structure. |
1135 | * Ownership of filter_expression is taken. | |
0475c50c DG |
1136 | * |
1137 | * Return a new object else NULL on error. | |
1138 | */ | |
022d91ba | 1139 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 1140 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
2b00d462 | 1141 | struct lttng_bytecode *filter, char *filter_expression) |
0475c50c | 1142 | { |
51755dc8 | 1143 | struct agent_event *event = NULL; |
0475c50c | 1144 | |
6b10b3b0 AM |
1145 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
1146 | loglevel value %d and filter %s", | |
40111ba1 JG |
1147 | name, loglevel_type, loglevel_value, |
1148 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 1149 | |
51755dc8 JG |
1150 | if (!name) { |
1151 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
1152 | goto error; |
1153 | } | |
1154 | ||
51755dc8 JG |
1155 | event = zmalloc(sizeof(*event)); |
1156 | if (!event) { | |
1157 | goto error; | |
0475c50c DG |
1158 | } |
1159 | ||
51755dc8 JG |
1160 | strncpy(event->name, name, sizeof(event->name)); |
1161 | event->name[sizeof(event->name) - 1] = '\0'; | |
1162 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 1163 | |
2106efa0 | 1164 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
1165 | event->loglevel_type = loglevel_type; |
1166 | event->filter = filter; | |
1167 | event->filter_expression = filter_expression; | |
0475c50c DG |
1168 | error: |
1169 | return event; | |
1170 | } | |
1171 | ||
1172 | /* | |
022d91ba | 1173 | * Unique add of a agent event to an agent object. |
0475c50c | 1174 | */ |
022d91ba | 1175 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
1176 | { |
1177 | assert(event); | |
022d91ba DG |
1178 | assert(agt); |
1179 | assert(agt->events); | |
0475c50c | 1180 | |
022d91ba | 1181 | DBG3("Agent adding event %s", event->name); |
022d91ba | 1182 | add_unique_agent_event(agt->events, event); |
022d91ba | 1183 | agt->being_used = 1; |
0475c50c DG |
1184 | } |
1185 | ||
bdf64013 JG |
1186 | /* |
1187 | * Unique add of a agent context to an agent object. | |
1188 | */ | |
df4f5a87 | 1189 | int agent_add_context(const struct lttng_event_context *ctx, struct agent *agt) |
bdf64013 JG |
1190 | { |
1191 | int ret = LTTNG_OK; | |
1192 | struct agent_app_ctx *agent_ctx = NULL; | |
1193 | ||
1194 | assert(ctx); | |
1195 | assert(agt); | |
1196 | assert(agt->events); | |
1197 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
1198 | ||
1199 | agent_ctx = create_app_ctx(ctx); | |
1200 | if (!agent_ctx) { | |
1201 | ret = LTTNG_ERR_NOMEM; | |
1202 | goto end; | |
1203 | } | |
1204 | ||
1205 | DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name, | |
1206 | ctx->u.app_ctx.ctx_name); | |
1207 | cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list); | |
1208 | end: | |
1209 | return ret; | |
1210 | } | |
1211 | ||
0475c50c | 1212 | /* |
e261a6cc | 1213 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 1214 | * |
e261a6cc PP |
1215 | * RCU read side lock MUST be acquired. It must be held for the |
1216 | * duration of the iteration. | |
4a4ab2c3 | 1217 | * |
e261a6cc | 1218 | * Sets the given iterator. |
4a4ab2c3 | 1219 | */ |
e261a6cc PP |
1220 | void agent_find_events_by_name(const char *name, struct agent *agt, |
1221 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 1222 | { |
4a4ab2c3 | 1223 | struct lttng_ht *ht; |
022d91ba | 1224 | struct agent_ht_key key; |
4a4ab2c3 DG |
1225 | |
1226 | assert(name); | |
022d91ba DG |
1227 | assert(agt); |
1228 | assert(agt->events); | |
e261a6cc | 1229 | assert(iter); |
4a4ab2c3 | 1230 | |
022d91ba | 1231 | ht = agt->events; |
4a4ab2c3 DG |
1232 | key.name = name; |
1233 | ||
1234 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
1235 | ht_match_event_by_name, &key, &iter->iter); |
1236 | } | |
4a4ab2c3 | 1237 | |
44760c20 JR |
1238 | /* |
1239 | * Find the agent event matching a trigger. | |
1240 | * | |
1241 | * RCU read side lock MUST be acquired. It must be held for as long as | |
1242 | * the returned agent_event is used. | |
1243 | * | |
1244 | * Return object if found else NULL. | |
1245 | */ | |
1246 | struct agent_event *agent_find_event_by_trigger( | |
1247 | const struct lttng_trigger *trigger, struct agent *agt) | |
1248 | { | |
1249 | enum lttng_condition_status c_status; | |
1250 | enum lttng_event_rule_status er_status; | |
1251 | enum lttng_domain_type domain; | |
1252 | const struct lttng_condition *condition; | |
1253 | const struct lttng_event_rule *rule; | |
1254 | const char *name; | |
1255 | const char *filter_expression; | |
85b05318 | 1256 | const struct lttng_log_level_rule *log_level_rule; |
44760c20 JR |
1257 | /* Unused when loglevel_type is 'ALL'. */ |
1258 | int loglevel_value = 0; | |
1259 | enum lttng_loglevel_type loglevel_type; | |
695f7044 JR |
1260 | event_rule_logging_get_name_pattern logging_get_name_pattern; |
1261 | event_rule_logging_get_log_level_rule logging_get_log_level_rule; | |
44760c20 JR |
1262 | |
1263 | assert(agt); | |
1264 | assert(agt->events); | |
1265 | ||
1266 | condition = lttng_trigger_get_const_condition(trigger); | |
1267 | ||
1268 | assert(lttng_condition_get_type(condition) == | |
8dbb86b8 | 1269 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
44760c20 | 1270 | |
8dbb86b8 JR |
1271 | c_status = lttng_condition_event_rule_matches_get_rule( |
1272 | condition, &rule); | |
44760c20 JR |
1273 | assert(c_status == LTTNG_CONDITION_STATUS_OK); |
1274 | ||
695f7044 JR |
1275 | switch (lttng_event_rule_get_type(rule)) { |
1276 | case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING: | |
1277 | logging_get_name_pattern = | |
1278 | lttng_event_rule_jul_logging_get_name_pattern; | |
1279 | logging_get_log_level_rule = | |
1280 | lttng_event_rule_jul_logging_get_log_level_rule; | |
1281 | break; | |
1282 | case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING: | |
1283 | logging_get_name_pattern = | |
1284 | lttng_event_rule_log4j_logging_get_name_pattern; | |
1285 | logging_get_log_level_rule = | |
1286 | lttng_event_rule_log4j_logging_get_log_level_rule; | |
1287 | break; | |
1288 | case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING: | |
1289 | logging_get_name_pattern = | |
1290 | lttng_event_rule_python_logging_get_name_pattern; | |
1291 | logging_get_log_level_rule = | |
1292 | lttng_event_rule_python_logging_get_log_level_rule; | |
1293 | break; | |
1294 | default: | |
1295 | abort(); | |
1296 | break; | |
1297 | } | |
44760c20 JR |
1298 | |
1299 | domain = lttng_event_rule_get_domain_type(rule); | |
1300 | assert(domain == LTTNG_DOMAIN_JUL || domain == LTTNG_DOMAIN_LOG4J || | |
1301 | domain == LTTNG_DOMAIN_PYTHON); | |
1302 | ||
8bc73626 | 1303 | /* Get the event's pattern name ('name' in the legacy terminology). */ |
695f7044 | 1304 | er_status = logging_get_name_pattern(rule, &name); |
44760c20 JR |
1305 | assert(er_status == LTTNG_EVENT_RULE_STATUS_OK); |
1306 | ||
1307 | /* Get the internal filter expression. */ | |
1308 | filter_expression = lttng_event_rule_get_filter(rule); | |
1309 | ||
85b05318 | 1310 | /* Map log_level_rule to loglevel value. */ |
695f7044 | 1311 | er_status = logging_get_log_level_rule(rule, &log_level_rule); |
85b05318 JR |
1312 | if (er_status == LTTNG_EVENT_RULE_STATUS_UNSET) { |
1313 | loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
1314 | loglevel_value = 0; | |
1315 | } else if (er_status == LTTNG_EVENT_RULE_STATUS_OK) { | |
1316 | lttng_log_level_rule_to_loglevel(log_level_rule, &loglevel_type, &loglevel_value); | |
1317 | } else { | |
1318 | abort(); | |
44760c20 JR |
1319 | } |
1320 | ||
1321 | return agent_find_event(name, loglevel_type, loglevel_value, | |
1322 | filter_expression, agt); | |
1323 | } | |
1324 | ||
e261a6cc PP |
1325 | /* |
1326 | * Get the next agent event duplicate by name. This should be called | |
1327 | * after a call to agent_find_events_by_name() to iterate on events. | |
1328 | * | |
1329 | * The RCU read lock must be held during the iteration and for as long | |
1330 | * as the object the iterator points to remains in use. | |
1331 | */ | |
1332 | void agent_event_next_duplicate(const char *name, | |
1333 | struct agent *agt, struct lttng_ht_iter* iter) | |
1334 | { | |
1335 | struct agent_ht_key key; | |
4a4ab2c3 | 1336 | |
e261a6cc PP |
1337 | key.name = name; |
1338 | ||
1339 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
1340 | &key, &iter->iter); | |
4a4ab2c3 DG |
1341 | } |
1342 | ||
1343 | /* | |
6b10b3b0 | 1344 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c | 1345 | * |
1e17eae2 JG |
1346 | * RCU read side lock MUST be acquired. It must be kept for as long as |
1347 | * the returned agent_event is used. | |
0475c50c DG |
1348 | * |
1349 | * Return object if found else NULL. | |
1350 | */ | |
a9319624 | 1351 | struct agent_event *agent_find_event(const char *name, |
44760c20 JR |
1352 | enum lttng_loglevel_type loglevel_type, |
1353 | int loglevel_value, | |
1354 | const char *filter_expression, | |
1355 | struct agent *agt) | |
0475c50c DG |
1356 | { |
1357 | struct lttng_ht_node_str *node; | |
1358 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 1359 | struct lttng_ht *ht; |
022d91ba | 1360 | struct agent_ht_key key; |
0475c50c DG |
1361 | |
1362 | assert(name); | |
022d91ba DG |
1363 | assert(agt); |
1364 | assert(agt->events); | |
0475c50c | 1365 | |
022d91ba | 1366 | ht = agt->events; |
4a4ab2c3 | 1367 | key.name = name; |
2106efa0 | 1368 | key.loglevel_value = loglevel_value; |
a9319624 | 1369 | key.loglevel_type = loglevel_type; |
6b10b3b0 | 1370 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
1371 | |
1372 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1373 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
1374 | node = lttng_ht_iter_get_node_str(&iter); |
1375 | if (node == NULL) { | |
1376 | goto error; | |
1377 | } | |
1378 | ||
022d91ba DG |
1379 | DBG3("Agent event found %s.", name); |
1380 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
1381 | |
1382 | error: | |
a51e817b | 1383 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
1384 | return NULL; |
1385 | } | |
1386 | ||
0475c50c | 1387 | /* |
022d91ba DG |
1388 | * Free given agent event. This event must not be globally visible at this |
1389 | * point (only expected to be used on failure just after event creation). After | |
1390 | * this call, the pointer is not usable anymore. | |
0475c50c | 1391 | */ |
022d91ba | 1392 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
1393 | { |
1394 | assert(event); | |
1395 | ||
971da06a | 1396 | free(event->filter); |
8404118c | 1397 | free(event->filter_expression); |
51755dc8 | 1398 | free(event->exclusion); |
0475c50c DG |
1399 | free(event); |
1400 | } | |
1401 | ||
bdf64013 JG |
1402 | static |
1403 | void destroy_app_ctx_rcu(struct rcu_head *head) | |
1404 | { | |
1405 | struct agent_app_ctx *ctx = | |
1406 | caa_container_of(head, struct agent_app_ctx, rcu_node); | |
1407 | ||
1408 | destroy_app_ctx(ctx); | |
1409 | } | |
1410 | ||
0475c50c | 1411 | /* |
35ed21a5 | 1412 | * Destroy an agent completely. |
0475c50c | 1413 | */ |
022d91ba | 1414 | void agent_destroy(struct agent *agt) |
0475c50c DG |
1415 | { |
1416 | struct lttng_ht_node_str *node; | |
1417 | struct lttng_ht_iter iter; | |
bdf64013 | 1418 | struct agent_app_ctx *ctx; |
0475c50c | 1419 | |
022d91ba | 1420 | assert(agt); |
0475c50c | 1421 | |
022d91ba | 1422 | DBG3("Agent destroy"); |
0475c50c | 1423 | |
0475c50c | 1424 | rcu_read_lock(); |
022d91ba | 1425 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 1426 | int ret; |
022d91ba | 1427 | struct agent_event *event; |
29c0fd4d DG |
1428 | |
1429 | /* | |
bdf64013 JG |
1430 | * When destroying an event, we have to try to disable it on the |
1431 | * agent side so the event stops generating data. The return | |
1432 | * value is not important since we have to continue anyway | |
1433 | * destroying the object. | |
29c0fd4d | 1434 | */ |
022d91ba DG |
1435 | event = caa_container_of(node, struct agent_event, node); |
1436 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1437 | |
022d91ba | 1438 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1439 | assert(!ret); |
022d91ba | 1440 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c | 1441 | } |
0475c50c | 1442 | |
bdf64013 JG |
1443 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
1444 | (void) disable_context(ctx, agt->domain); | |
1445 | cds_list_del(&ctx->list_node); | |
1446 | call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); | |
1447 | } | |
1448 | rcu_read_unlock(); | |
f8be902b | 1449 | ht_cleanup_push(agt->events); |
35ed21a5 | 1450 | free(agt); |
f20baf8e DG |
1451 | } |
1452 | ||
1453 | /* | |
6a4e4039 | 1454 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1455 | */ |
6a4e4039 | 1456 | int agent_app_ht_alloc(void) |
f20baf8e | 1457 | { |
412d7227 SM |
1458 | the_agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1459 | return the_agent_apps_ht_by_sock ? 0 : -1; | |
6a4e4039 JG |
1460 | } |
1461 | ||
1462 | /* | |
1463 | * Destroy a agent application by socket. | |
1464 | */ | |
1465 | void agent_destroy_app_by_sock(int sock) | |
1466 | { | |
1467 | struct agent_app *app; | |
1468 | ||
1469 | assert(sock >= 0); | |
1470 | ||
1471 | /* | |
1472 | * Not finding an application is a very important error that should NEVER | |
1473 | * happen. The hash table deletion is ONLY done through this call when the | |
1474 | * main sessiond thread is torn down. | |
1475 | */ | |
1476 | rcu_read_lock(); | |
1477 | app = agent_find_app_by_sock(sock); | |
1478 | assert(app); | |
1479 | ||
1480 | /* RCU read side lock is assumed to be held by this function. */ | |
1481 | agent_delete_app(app); | |
1482 | ||
1483 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1484 | agent_destroy_app(app); | |
1485 | rcu_read_unlock(); | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Clean-up the agent app hash table and destroy it. | |
1490 | */ | |
1491 | void agent_app_ht_clean(void) | |
1492 | { | |
1493 | struct lttng_ht_node_ulong *node; | |
1494 | struct lttng_ht_iter iter; | |
1495 | ||
412d7227 | 1496 | if (!the_agent_apps_ht_by_sock) { |
a433283e JG |
1497 | return; |
1498 | } | |
6a4e4039 | 1499 | rcu_read_lock(); |
412d7227 SM |
1500 | cds_lfht_for_each_entry( |
1501 | the_agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
6a4e4039 JG |
1502 | struct agent_app *app; |
1503 | ||
1504 | app = caa_container_of(node, struct agent_app, node); | |
1505 | agent_destroy_app_by_sock(app->sock->fd); | |
1506 | } | |
1507 | rcu_read_unlock(); | |
1508 | ||
412d7227 | 1509 | lttng_ht_destroy(the_agent_apps_ht_by_sock); |
f20baf8e DG |
1510 | } |
1511 | ||
1512 | /* | |
022d91ba | 1513 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1514 | * |
1515 | * Note that this function is most likely to be used with a tracing session | |
1516 | * thus the caller should make sure to hold the appropriate lock(s). | |
1517 | */ | |
733c9165 | 1518 | void agent_update(const struct agent *agt, const struct agent_app *app) |
f20baf8e DG |
1519 | { |
1520 | int ret; | |
022d91ba | 1521 | struct agent_event *event; |
f20baf8e | 1522 | struct lttng_ht_iter iter; |
bdf64013 | 1523 | struct agent_app_ctx *ctx; |
f20baf8e | 1524 | |
022d91ba | 1525 | assert(agt); |
733c9165 | 1526 | assert(app); |
f20baf8e | 1527 | |
733c9165 | 1528 | DBG("Agent updating app: pid = %ld", (long) app->pid); |
f20baf8e DG |
1529 | |
1530 | rcu_read_lock(); | |
bdf64013 JG |
1531 | /* |
1532 | * We are in the registration path thus if the application is gone, | |
1533 | * there is a serious code flow error. | |
1534 | */ | |
733c9165 | 1535 | |
022d91ba | 1536 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e | 1537 | /* Skip event if disabled. */ |
44760c20 | 1538 | if (!AGENT_EVENT_IS_ENABLED(event)) { |
f20baf8e DG |
1539 | continue; |
1540 | } | |
1541 | ||
f20baf8e DG |
1542 | ret = enable_event(app, event); |
1543 | if (ret != LTTNG_OK) { | |
022d91ba | 1544 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1545 | event->name, app->pid, app->sock->fd); |
1546 | /* Let's try the others here and don't assume the app is dead. */ | |
1547 | continue; | |
1548 | } | |
1549 | } | |
bdf64013 JG |
1550 | |
1551 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { | |
1552 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); | |
1553 | if (ret != LTTNG_OK) { | |
1554 | DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", | |
1555 | ctx->provider_name, ctx->ctx_name, | |
1556 | app->pid, app->sock->fd); | |
1557 | continue; | |
1558 | } | |
1559 | } | |
1560 | ||
f20baf8e | 1561 | rcu_read_unlock(); |
0475c50c | 1562 | } |
44760c20 JR |
1563 | |
1564 | /* | |
1565 | * Allocate the per-event notifier domain agent hash table. It is lazily | |
1566 | * populated as domains are used. | |
1567 | */ | |
1568 | int agent_by_event_notifier_domain_ht_create(void) | |
1569 | { | |
412d7227 SM |
1570 | the_trigger_agents_ht_by_domain = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
1571 | return the_trigger_agents_ht_by_domain ? 0 : -1; | |
44760c20 JR |
1572 | } |
1573 | ||
1574 | /* | |
1575 | * Clean-up the per-event notifier domain agent hash table and destroy it. | |
1576 | */ | |
1577 | void agent_by_event_notifier_domain_ht_destroy(void) | |
1578 | { | |
1579 | struct lttng_ht_node_u64 *node; | |
1580 | struct lttng_ht_iter iter; | |
1581 | ||
412d7227 | 1582 | if (!the_trigger_agents_ht_by_domain) { |
44760c20 JR |
1583 | return; |
1584 | } | |
1585 | ||
1586 | rcu_read_lock(); | |
412d7227 SM |
1587 | cds_lfht_for_each_entry(the_trigger_agents_ht_by_domain->ht, |
1588 | &iter.iter, node, node) { | |
44760c20 JR |
1589 | struct agent *agent = |
1590 | caa_container_of(node, struct agent, node); | |
1591 | const int ret = lttng_ht_del( | |
412d7227 | 1592 | the_trigger_agents_ht_by_domain, &iter); |
44760c20 JR |
1593 | |
1594 | assert(ret == 0); | |
1595 | agent_destroy(agent); | |
1596 | } | |
1597 | ||
1598 | rcu_read_unlock(); | |
412d7227 | 1599 | lttng_ht_destroy(the_trigger_agents_ht_by_domain); |
44760c20 JR |
1600 | } |
1601 | ||
1602 | struct agent *agent_find_by_event_notifier_domain( | |
1603 | enum lttng_domain_type domain_type) | |
1604 | { | |
1605 | struct agent *agt = NULL; | |
1606 | struct lttng_ht_node_u64 *node; | |
1607 | struct lttng_ht_iter iter; | |
1608 | const uint64_t key = (uint64_t) domain_type; | |
1609 | ||
412d7227 | 1610 | assert(the_trigger_agents_ht_by_domain); |
44760c20 JR |
1611 | |
1612 | DBG3("Per-event notifier domain agent lookup for domain '%s'", | |
1613 | lttng_domain_type_str(domain_type)); | |
1614 | ||
412d7227 | 1615 | lttng_ht_lookup(the_trigger_agents_ht_by_domain, &key, &iter); |
44760c20 JR |
1616 | node = lttng_ht_iter_get_node_u64(&iter); |
1617 | if (!node) { | |
1618 | goto end; | |
1619 | } | |
1620 | ||
1621 | agt = caa_container_of(node, struct agent, node); | |
1622 | ||
1623 | end: | |
1624 | return agt; | |
1625 | } |