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