Commit | Line | Data |
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0475c50c DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
0475c50c DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
0475c50c | 20 | #include <assert.h> |
f20baf8e | 21 | #include <urcu/uatomic.h> |
bdf64013 | 22 | #include <urcu/rculist.h> |
0475c50c DG |
23 | |
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 | ||
bdf64013 JG |
36 | /* |
37 | * Agent application context representation. | |
38 | */ | |
39 | struct agent_app_ctx { | |
40 | char *provider_name; | |
41 | char *ctx_name; | |
42 | ||
43 | /* agent_app_ctx are part of the agent app_ctx_list. */ | |
44 | struct cds_list_head list_node; | |
45 | ||
46 | /* For call_rcu teardown. */ | |
47 | struct rcu_head rcu_node; | |
48 | }; | |
49 | ||
23c2bd47 JG |
50 | /* |
51 | * Human readable agent return code. | |
52 | */ | |
53 | static const char *error_string_array[] = { | |
54 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
55 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
56 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
57 | ||
58 | /* Last element */ | |
59 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
60 | }; | |
61 | ||
62 | static | |
63 | void log_reply_code(uint32_t in_reply_ret_code) | |
64 | { | |
65 | int level = PRINT_DBG3; | |
66 | /* | |
67 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
68 | * sanitized value (used to retrieve the human readable string) and the | |
69 | * original value which is logged as-is. | |
70 | */ | |
71 | uint32_t reply_ret_code = in_reply_ret_code; | |
72 | ||
73 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
74 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
75 | reply_ret_code = AGENT_RET_CODE_NR; | |
76 | level = PRINT_ERR; | |
77 | } | |
78 | ||
79 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
80 | error_string_array[AGENT_RET_CODE_INDEX( | |
81 | reply_ret_code)], | |
82 | in_reply_ret_code); | |
83 | } | |
0475c50c | 84 | |
4a4ab2c3 DG |
85 | /* |
86 | * Match function for the events hash table lookup by name. | |
87 | */ | |
88 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
89 | const void *_key) | |
90 | { | |
022d91ba DG |
91 | struct agent_event *event; |
92 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
93 | |
94 | assert(node); | |
95 | assert(_key); | |
96 | ||
022d91ba | 97 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
98 | key = _key; |
99 | ||
100 | /* Match 1 elements of the key: name. */ | |
101 | ||
102 | /* Event name */ | |
103 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
104 | goto no_match; | |
105 | } | |
106 | /* Match. */ | |
107 | return 1; | |
108 | ||
109 | no_match: | |
110 | return 0; | |
111 | } | |
112 | ||
113 | /* | |
114 | * Match function for the events hash table lookup by name and loglevel. | |
115 | */ | |
116 | static int ht_match_event(struct cds_lfht_node *node, | |
117 | const void *_key) | |
118 | { | |
022d91ba DG |
119 | struct agent_event *event; |
120 | const struct agent_ht_key *key; | |
19a97244 | 121 | int ll_match; |
4a4ab2c3 DG |
122 | |
123 | assert(node); | |
124 | assert(_key); | |
125 | ||
022d91ba | 126 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
127 | key = _key; |
128 | ||
129 | /* Match 2 elements of the key: name and loglevel. */ | |
130 | ||
131 | /* Event name */ | |
132 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
133 | goto no_match; | |
134 | } | |
135 | ||
a9319624 | 136 | /* Event loglevel value and type. */ |
19a97244 PP |
137 | ll_match = loglevels_match(event->loglevel_type, |
138 | event->loglevel_value, key->loglevel_type, | |
139 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
140 | ||
141 | if (!ll_match) { | |
4a4ab2c3 DG |
142 | goto no_match; |
143 | } | |
a9319624 | 144 | |
6b10b3b0 | 145 | /* Filter expression */ |
d42bc3c8 | 146 | if (!!event->filter_expression != !!key->filter_expression) { |
71e147d0 | 147 | /* One has a filter expression, the other does not */ |
6b10b3b0 AM |
148 | goto no_match; |
149 | } | |
150 | ||
71e147d0 PP |
151 | if (event->filter_expression) { |
152 | if (strncmp(event->filter_expression, key->filter_expression, | |
153 | strlen(event->filter_expression)) != 0) { | |
154 | goto no_match; | |
155 | } | |
156 | } | |
157 | ||
4a4ab2c3 DG |
158 | return 1; |
159 | ||
160 | no_match: | |
161 | return 0; | |
162 | } | |
163 | ||
164 | /* | |
022d91ba | 165 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 166 | */ |
022d91ba DG |
167 | static void add_unique_agent_event(struct lttng_ht *ht, |
168 | struct agent_event *event) | |
4a4ab2c3 DG |
169 | { |
170 | struct cds_lfht_node *node_ptr; | |
022d91ba | 171 | struct agent_ht_key key; |
4a4ab2c3 DG |
172 | |
173 | assert(ht); | |
174 | assert(ht->ht); | |
175 | assert(event); | |
176 | ||
177 | key.name = event->name; | |
2106efa0 | 178 | key.loglevel_value = event->loglevel_value; |
a9319624 | 179 | key.loglevel_type = event->loglevel_type; |
6b10b3b0 | 180 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
181 | |
182 | node_ptr = cds_lfht_add_unique(ht->ht, | |
183 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
184 | ht_match_event, &key, &event->node.node); | |
185 | assert(node_ptr == &event->node.node); | |
186 | } | |
187 | ||
0475c50c | 188 | /* |
022d91ba | 189 | * URCU delayed agent event reclaim. |
0475c50c | 190 | */ |
022d91ba | 191 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
192 | { |
193 | struct lttng_ht_node_str *node = | |
194 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
195 | struct agent_event *event = |
196 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 197 | |
992febc7 | 198 | agent_destroy_event(event); |
0475c50c DG |
199 | } |
200 | ||
f20baf8e | 201 | /* |
022d91ba | 202 | * URCU delayed agent app reclaim. |
f20baf8e | 203 | */ |
022d91ba | 204 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
205 | { |
206 | struct lttng_ht_node_ulong *node = | |
207 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
208 | struct agent_app *app = |
209 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
210 | |
211 | free(app); | |
212 | } | |
213 | ||
214 | /* | |
022d91ba DG |
215 | * Communication with the agent. Send the message header to the given socket in |
216 | * big endian. | |
f20baf8e DG |
217 | * |
218 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
219 | */ | |
220 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
221 | uint32_t cmd, uint32_t cmd_version) | |
222 | { | |
223 | int ret; | |
224 | ssize_t size; | |
022d91ba | 225 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
226 | |
227 | assert(sock); | |
228 | ||
53efb85a | 229 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
230 | msg.data_size = htobe64(data_size); |
231 | msg.cmd = htobe32(cmd); | |
232 | msg.cmd_version = htobe32(cmd_version); | |
233 | ||
234 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
235 | if (size < sizeof(msg)) { | |
236 | ret = -errno; | |
237 | goto error; | |
238 | } | |
239 | ret = 0; | |
240 | ||
241 | error: | |
242 | return ret; | |
243 | } | |
244 | ||
245 | /* | |
022d91ba DG |
246 | * Communication call with the agent. Send the payload to the given socket. The |
247 | * header MUST be sent prior to this call. | |
f20baf8e DG |
248 | * |
249 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
250 | */ | |
bdf64013 | 251 | static int send_payload(struct lttcomm_sock *sock, const void *data, |
f20baf8e DG |
252 | size_t size) |
253 | { | |
254 | int ret; | |
255 | ssize_t len; | |
256 | ||
257 | assert(sock); | |
258 | assert(data); | |
259 | ||
260 | len = sock->ops->sendmsg(sock, data, size, 0); | |
261 | if (len < size) { | |
262 | ret = -errno; | |
263 | goto error; | |
264 | } | |
265 | ret = 0; | |
266 | ||
267 | error: | |
268 | return ret; | |
269 | } | |
270 | ||
271 | /* | |
022d91ba DG |
272 | * Communication call with the agent. Receive reply from the agent using the |
273 | * given socket. | |
f20baf8e DG |
274 | * |
275 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
276 | */ | |
277 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
278 | { | |
279 | int ret; | |
280 | ssize_t len; | |
281 | ||
282 | assert(sock); | |
283 | assert(buf); | |
284 | ||
285 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
286 | if (len < size) { | |
287 | ret = -errno; | |
288 | goto error; | |
289 | } | |
290 | ret = 0; | |
291 | ||
292 | error: | |
293 | return ret; | |
294 | } | |
295 | ||
3c6a091f | 296 | /* |
428de77a | 297 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
298 | * |
299 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
300 | * On success, the caller is responsible for freeing the memory |
301 | * allocated for "events". | |
3c6a091f | 302 | */ |
022d91ba | 303 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
304 | { |
305 | int ret, i, len = 0, offset = 0; | |
306 | uint32_t nb_event; | |
307 | size_t data_size; | |
d84af1a4 | 308 | uint32_t reply_ret_code; |
3c6a091f | 309 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
310 | struct lttcomm_agent_list_reply *reply = NULL; |
311 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
312 | |
313 | assert(app); | |
314 | assert(app->sock); | |
315 | assert(events); | |
316 | ||
022d91ba | 317 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
318 | app->sock->fd); |
319 | ||
022d91ba | 320 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
321 | if (ret < 0) { |
322 | goto error_io; | |
323 | } | |
324 | ||
325 | /* Get list header so we know how much we'll receive. */ | |
326 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
327 | if (ret < 0) { | |
328 | goto error_io; | |
329 | } | |
330 | ||
d84af1a4 JG |
331 | reply_ret_code = be32toh(reply_hdr.ret_code); |
332 | log_reply_code(reply_ret_code); | |
333 | switch (reply_ret_code) { | |
022d91ba | 334 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
335 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
336 | break; | |
337 | default: | |
3bd9aaeb | 338 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
339 | goto error; |
340 | } | |
341 | ||
342 | reply = zmalloc(data_size); | |
343 | if (!reply) { | |
344 | ret = LTTNG_ERR_NOMEM; | |
345 | goto error; | |
346 | } | |
347 | ||
348 | /* Get the list with the appropriate data size. */ | |
349 | ret = recv_reply(app->sock, reply, data_size); | |
350 | if (ret < 0) { | |
351 | goto error_io; | |
352 | } | |
353 | ||
354 | nb_event = be32toh(reply->nb_event); | |
355 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
356 | if (!tmp_events) { | |
357 | ret = LTTNG_ERR_NOMEM; | |
358 | goto error; | |
359 | } | |
360 | ||
361 | for (i = 0; i < nb_event; i++) { | |
362 | offset += len; | |
0a85e7a3 MD |
363 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
364 | sizeof(tmp_events[i].name))) { | |
365 | ret = LTTNG_ERR_INVALID; | |
366 | goto error; | |
367 | } | |
3c6a091f DG |
368 | tmp_events[i].pid = app->pid; |
369 | tmp_events[i].enabled = -1; | |
370 | len = strlen(reply->payload + offset) + 1; | |
371 | } | |
372 | ||
373 | *events = tmp_events; | |
374 | ||
375 | free(reply); | |
376 | return nb_event; | |
377 | ||
378 | error_io: | |
379 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
380 | error: | |
381 | free(reply); | |
382 | free(tmp_events); | |
383 | return -ret; | |
384 | ||
385 | } | |
386 | ||
f20baf8e | 387 | /* |
022d91ba DG |
388 | * Internal enable agent event on a agent application. This function |
389 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
390 | * |
391 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
392 | */ | |
022d91ba | 393 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
394 | { |
395 | int ret; | |
a0ba721c | 396 | char *bytes_to_send; |
f20baf8e | 397 | uint64_t data_size; |
a0ba721c | 398 | size_t filter_expression_length; |
f4f9d4db | 399 | uint32_t reply_ret_code; |
bdf64013 | 400 | struct lttcomm_agent_enable_event msg; |
022d91ba | 401 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
402 | |
403 | assert(app); | |
404 | assert(app->sock); | |
405 | assert(event); | |
406 | ||
022d91ba | 407 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
408 | app->pid, app->sock->fd); |
409 | ||
a0ba721c AM |
410 | /* |
411 | * Calculate the payload's size, which is the fixed-size struct followed | |
412 | * by the variable-length filter expression (+1 for the ending \0). | |
413 | */ | |
414 | if (!event->filter_expression) { | |
415 | filter_expression_length = 0; | |
416 | } else { | |
417 | filter_expression_length = strlen(event->filter_expression) + 1; | |
418 | } | |
419 | data_size = sizeof(msg) + filter_expression_length; | |
f20baf8e | 420 | |
53efb85a | 421 | memset(&msg, 0, sizeof(msg)); |
a9bfd666 JG |
422 | msg.loglevel_value = htobe32(event->loglevel_value); |
423 | msg.loglevel_type = htobe32(event->loglevel_type); | |
bb45c03e MD |
424 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { |
425 | ret = LTTNG_ERR_INVALID; | |
426 | goto error; | |
427 | } | |
a9bfd666 | 428 | msg.filter_expression_length = htobe32(filter_expression_length); |
a0ba721c | 429 | |
bb45c03e MD |
430 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
431 | if (ret < 0) { | |
432 | goto error_io; | |
433 | } | |
434 | ||
a0ba721c AM |
435 | bytes_to_send = zmalloc(data_size); |
436 | if (!bytes_to_send) { | |
437 | ret = LTTNG_ERR_NOMEM; | |
438 | goto error; | |
439 | } | |
440 | ||
441 | memcpy(bytes_to_send, &msg, sizeof(msg)); | |
442 | if (filter_expression_length > 0) { | |
443 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, | |
444 | filter_expression_length); | |
445 | } | |
446 | ||
447 | ret = send_payload(app->sock, bytes_to_send, data_size); | |
448 | free(bytes_to_send); | |
f20baf8e DG |
449 | if (ret < 0) { |
450 | goto error_io; | |
451 | } | |
452 | ||
453 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
454 | if (ret < 0) { | |
455 | goto error_io; | |
456 | } | |
457 | ||
f4f9d4db JG |
458 | reply_ret_code = be32toh(reply.ret_code); |
459 | log_reply_code(reply_ret_code); | |
460 | switch (reply_ret_code) { | |
022d91ba | 461 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 462 | break; |
022d91ba | 463 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
464 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
465 | goto error; | |
466 | default: | |
3bd9aaeb | 467 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
468 | goto error; |
469 | } | |
470 | ||
471 | return LTTNG_OK; | |
472 | ||
473 | error_io: | |
474 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
475 | error: | |
476 | return ret; | |
477 | } | |
478 | ||
bdf64013 JG |
479 | /* |
480 | * Send Pascal-style string. Size is sent as a 32-bit big endian integer. | |
481 | */ | |
482 | static | |
483 | int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len) | |
484 | { | |
485 | int ret; | |
486 | uint32_t len_be; | |
487 | ||
488 | len_be = htobe32(len); | |
489 | ret = send_payload(sock, &len_be, sizeof(len_be)); | |
490 | if (ret) { | |
491 | goto end; | |
492 | } | |
493 | ||
494 | ret = send_payload(sock, str, len); | |
495 | if (ret) { | |
496 | goto end; | |
497 | } | |
498 | end: | |
499 | return ret; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Internal enable application context on an agent application. This function | |
504 | * communicates with the agent to enable a given application context. | |
505 | * | |
506 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
507 | */ | |
508 | static int app_context_op(struct agent_app *app, | |
509 | struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd) | |
510 | { | |
511 | int ret; | |
512 | uint32_t reply_ret_code; | |
513 | struct lttcomm_agent_generic_reply reply; | |
514 | size_t app_ctx_provider_name_len, app_ctx_name_len, data_size; | |
515 | ||
516 | assert(app); | |
517 | assert(app->sock); | |
518 | assert(ctx); | |
519 | assert(cmd == AGENT_CMD_APP_CTX_ENABLE || | |
520 | cmd == AGENT_CMD_APP_CTX_DISABLE); | |
521 | ||
522 | DBG2("Agent %s application %s:%s for app pid: %d and socket %d", | |
523 | cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling", | |
524 | ctx->provider_name, ctx->ctx_name, | |
525 | app->pid, app->sock->fd); | |
526 | ||
527 | /* | |
528 | * Calculate the payload's size, which consists of the size (u32, BE) | |
529 | * of the provider name, the NULL-terminated provider name string, the | |
530 | * size (u32, BE) of the context name, followed by the NULL-terminated | |
531 | * context name string. | |
532 | */ | |
533 | app_ctx_provider_name_len = strlen(ctx->provider_name) + 1; | |
534 | app_ctx_name_len = strlen(ctx->ctx_name) + 1; | |
535 | data_size = sizeof(uint32_t) + app_ctx_provider_name_len + | |
536 | sizeof(uint32_t) + app_ctx_name_len; | |
537 | ||
538 | ret = send_header(app->sock, data_size, cmd, 0); | |
539 | if (ret < 0) { | |
540 | goto error_io; | |
541 | } | |
542 | ||
543 | if (app_ctx_provider_name_len > UINT32_MAX || | |
544 | app_ctx_name_len > UINT32_MAX) { | |
545 | ERR("Application context name > MAX_UINT32"); | |
546 | ret = LTTNG_ERR_INVALID; | |
547 | goto error; | |
548 | } | |
549 | ||
550 | ret = send_pstring(app->sock, ctx->provider_name, | |
551 | (uint32_t) app_ctx_provider_name_len); | |
552 | if (ret < 0) { | |
553 | goto error_io; | |
554 | } | |
555 | ||
556 | ret = send_pstring(app->sock, ctx->ctx_name, | |
557 | (uint32_t) app_ctx_name_len); | |
558 | if (ret < 0) { | |
559 | goto error_io; | |
560 | } | |
561 | ||
562 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
563 | if (ret < 0) { | |
564 | goto error_io; | |
565 | } | |
566 | ||
567 | reply_ret_code = be32toh(reply.ret_code); | |
568 | log_reply_code(reply_ret_code); | |
569 | switch (reply_ret_code) { | |
570 | case AGENT_RET_CODE_SUCCESS: | |
571 | break; | |
572 | default: | |
573 | ret = LTTNG_ERR_UNK; | |
574 | goto error; | |
575 | } | |
576 | ||
577 | return LTTNG_OK; | |
578 | ||
579 | error_io: | |
580 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
581 | error: | |
582 | return ret; | |
583 | } | |
584 | ||
f20baf8e | 585 | /* |
022d91ba DG |
586 | * Internal disable agent event call on a agent application. This function |
587 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
588 | * |
589 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
590 | */ | |
022d91ba | 591 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
592 | { |
593 | int ret; | |
594 | uint64_t data_size; | |
517992f8 | 595 | uint32_t reply_ret_code; |
bdf64013 | 596 | struct lttcomm_agent_disable_event msg; |
022d91ba | 597 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
598 | |
599 | assert(app); | |
600 | assert(app->sock); | |
601 | assert(event); | |
602 | ||
022d91ba | 603 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
604 | app->pid, app->sock->fd); |
605 | ||
606 | data_size = sizeof(msg); | |
63be730a MD |
607 | memset(&msg, 0, sizeof(msg)); |
608 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
609 | ret = LTTNG_ERR_INVALID; | |
610 | goto error; | |
611 | } | |
f20baf8e | 612 | |
022d91ba | 613 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
614 | if (ret < 0) { |
615 | goto error_io; | |
616 | } | |
617 | ||
f20baf8e DG |
618 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
619 | if (ret < 0) { | |
620 | goto error_io; | |
621 | } | |
622 | ||
623 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
624 | if (ret < 0) { | |
625 | goto error_io; | |
626 | } | |
627 | ||
517992f8 JG |
628 | reply_ret_code = be32toh(reply.ret_code); |
629 | log_reply_code(reply_ret_code); | |
630 | switch (reply_ret_code) { | |
022d91ba DG |
631 | case AGENT_RET_CODE_SUCCESS: |
632 | break; | |
633 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
634 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
635 | goto error; | |
636 | default: | |
3bd9aaeb | 637 | ret = LTTNG_ERR_UNK; |
022d91ba | 638 | goto error; |
f20baf8e DG |
639 | } |
640 | ||
641 | return LTTNG_OK; | |
642 | ||
643 | error_io: | |
644 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
645 | error: | |
646 | return ret; | |
647 | } | |
648 | ||
1b500e7a | 649 | /* |
022d91ba | 650 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
651 | * |
652 | * Return 0 on success or else a negative value. | |
653 | */ | |
022d91ba | 654 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
655 | { |
656 | assert(app); | |
657 | assert(app->sock); | |
658 | ||
022d91ba | 659 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 660 | |
b26d1f5c | 661 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
662 | } |
663 | ||
f20baf8e | 664 | /* |
022d91ba | 665 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
666 | * daemon. |
667 | * | |
668 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
669 | */ | |
fefd409b DG |
670 | int agent_enable_event(struct agent_event *event, |
671 | enum lttng_domain_type domain) | |
f20baf8e DG |
672 | { |
673 | int ret; | |
022d91ba | 674 | struct agent_app *app; |
f20baf8e DG |
675 | struct lttng_ht_iter iter; |
676 | ||
677 | assert(event); | |
678 | ||
679 | rcu_read_lock(); | |
680 | ||
022d91ba | 681 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 682 | node.node) { |
fefd409b DG |
683 | if (app->domain != domain) { |
684 | continue; | |
685 | } | |
686 | ||
022d91ba | 687 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
688 | ret = enable_event(app, event); |
689 | if (ret != LTTNG_OK) { | |
690 | goto error; | |
691 | } | |
f20baf8e DG |
692 | } |
693 | ||
3c6a091f | 694 | event->enabled = 1; |
f20baf8e DG |
695 | ret = LTTNG_OK; |
696 | ||
697 | error: | |
698 | rcu_read_unlock(); | |
699 | return ret; | |
700 | } | |
701 | ||
bdf64013 JG |
702 | static |
703 | void destroy_app_ctx(struct agent_app_ctx *ctx) | |
704 | { | |
705 | free(ctx->provider_name); | |
706 | free(ctx->ctx_name); | |
707 | free(ctx); | |
708 | } | |
709 | ||
710 | static | |
711 | struct agent_app_ctx *create_app_ctx(struct lttng_event_context *ctx) | |
712 | { | |
713 | struct agent_app_ctx *agent_ctx = NULL; | |
714 | ||
715 | if (!ctx) { | |
716 | goto end; | |
717 | } | |
718 | ||
719 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
720 | agent_ctx = zmalloc(sizeof(*ctx)); | |
721 | if (!agent_ctx) { | |
722 | goto end; | |
723 | } | |
724 | ||
725 | agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name); | |
726 | agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name); | |
727 | if (!agent_ctx->provider_name || !agent_ctx->ctx_name) { | |
728 | destroy_app_ctx(agent_ctx); | |
729 | agent_ctx = NULL; | |
730 | } | |
731 | end: | |
732 | return agent_ctx; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Enable agent context on every agent applications registered with the session | |
737 | * daemon. | |
738 | * | |
739 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
740 | */ | |
741 | int agent_enable_context(struct lttng_event_context *ctx, | |
742 | enum lttng_domain_type domain) | |
743 | { | |
744 | int ret; | |
745 | struct agent_app *app; | |
746 | struct lttng_ht_iter iter; | |
747 | ||
748 | assert(ctx); | |
749 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
750 | ret = LTTNG_ERR_INVALID; | |
751 | goto error; | |
752 | } | |
753 | ||
754 | rcu_read_lock(); | |
755 | ||
756 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, | |
757 | node.node) { | |
758 | struct agent_app_ctx *agent_ctx; | |
759 | ||
760 | if (app->domain != domain) { | |
761 | continue; | |
762 | } | |
763 | ||
764 | agent_ctx = create_app_ctx(ctx); | |
765 | if (!agent_ctx) { | |
a33c2651 | 766 | ret = LTTNG_ERR_NOMEM; |
bdf64013 JG |
767 | goto error_unlock; |
768 | } | |
769 | ||
770 | /* Enable event on agent application through TCP socket. */ | |
771 | ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); | |
c12618b5 | 772 | destroy_app_ctx(agent_ctx); |
bdf64013 | 773 | if (ret != LTTNG_OK) { |
bdf64013 JG |
774 | goto error_unlock; |
775 | } | |
776 | } | |
777 | ||
778 | ret = LTTNG_OK; | |
779 | ||
780 | error_unlock: | |
781 | rcu_read_unlock(); | |
782 | error: | |
783 | return ret; | |
784 | } | |
785 | ||
f20baf8e | 786 | /* |
bdf64013 | 787 | * Disable agent event on every agent application registered with the session |
f20baf8e DG |
788 | * daemon. |
789 | * | |
790 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
791 | */ | |
fefd409b DG |
792 | int agent_disable_event(struct agent_event *event, |
793 | enum lttng_domain_type domain) | |
f20baf8e | 794 | { |
f1bc0129 | 795 | int ret = LTTNG_OK; |
022d91ba | 796 | struct agent_app *app; |
f20baf8e DG |
797 | struct lttng_ht_iter iter; |
798 | ||
799 | assert(event); | |
f1bc0129 JG |
800 | if (!event->enabled) { |
801 | goto end; | |
802 | } | |
f20baf8e DG |
803 | |
804 | rcu_read_lock(); | |
805 | ||
022d91ba | 806 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 807 | node.node) { |
fefd409b DG |
808 | if (app->domain != domain) { |
809 | continue; | |
810 | } | |
811 | ||
022d91ba | 812 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
813 | ret = disable_event(app, event); |
814 | if (ret != LTTNG_OK) { | |
815 | goto error; | |
816 | } | |
f20baf8e DG |
817 | } |
818 | ||
3c6a091f | 819 | event->enabled = 0; |
f20baf8e DG |
820 | |
821 | error: | |
822 | rcu_read_unlock(); | |
f1bc0129 | 823 | end: |
f20baf8e DG |
824 | return ret; |
825 | } | |
826 | ||
bdf64013 JG |
827 | /* |
828 | * Disable agent context on every agent application registered with the session | |
829 | * daemon. | |
830 | * | |
831 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
832 | */ | |
833 | int disable_context(struct agent_app_ctx *ctx, enum lttng_domain_type domain) | |
834 | { | |
835 | int ret = LTTNG_OK; | |
836 | struct agent_app *app; | |
837 | struct lttng_ht_iter iter; | |
838 | ||
839 | assert(ctx); | |
840 | ||
841 | rcu_read_lock(); | |
842 | DBG2("Disabling agent application context %s:%s", | |
843 | ctx->provider_name, ctx->ctx_name); | |
844 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, | |
845 | node.node) { | |
846 | if (app->domain != domain) { | |
847 | continue; | |
848 | } | |
849 | ||
850 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); | |
851 | if (ret != LTTNG_OK) { | |
852 | goto end; | |
853 | } | |
854 | } | |
855 | end: | |
856 | rcu_read_unlock(); | |
857 | return ret; | |
858 | } | |
859 | ||
f20baf8e | 860 | /* |
022d91ba DG |
861 | * Ask every agent for the list of possible event. Events is allocated with the |
862 | * events of every agent application. | |
f20baf8e DG |
863 | * |
864 | * Return the number of events or else a negative value. | |
865 | */ | |
f60140a1 DG |
866 | int agent_list_events(struct lttng_event **events, |
867 | enum lttng_domain_type domain) | |
f20baf8e DG |
868 | { |
869 | int ret; | |
870 | size_t nbmem, count = 0; | |
022d91ba | 871 | struct agent_app *app; |
aae6255e | 872 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
873 | struct lttng_ht_iter iter; |
874 | ||
875 | assert(events); | |
876 | ||
0e115563 DG |
877 | DBG2("Agent listing events for domain %d", domain); |
878 | ||
f20baf8e DG |
879 | nbmem = UST_APP_EVENT_LIST_SIZE; |
880 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
881 | if (!tmp_events) { | |
022d91ba | 882 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
883 | ret = -ENOMEM; |
884 | goto error; | |
885 | } | |
886 | ||
887 | rcu_read_lock(); | |
022d91ba | 888 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
889 | node.node) { |
890 | ssize_t nb_ev; | |
022d91ba | 891 | struct lttng_event *agent_events; |
f20baf8e | 892 | |
f60140a1 DG |
893 | /* Skip domain not asked by the list. */ |
894 | if (app->domain != domain) { | |
895 | continue; | |
896 | } | |
897 | ||
022d91ba | 898 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
899 | if (nb_ev < 0) { |
900 | ret = nb_ev; | |
428de77a | 901 | goto error_unlock; |
f20baf8e DG |
902 | } |
903 | ||
53efb85a | 904 | if (count + nb_ev > nbmem) { |
f20baf8e | 905 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
906 | struct lttng_event *new_tmp_events; |
907 | size_t new_nbmem; | |
908 | ||
909 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 910 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
911 | nbmem, new_nbmem); |
912 | new_tmp_events = realloc(tmp_events, | |
913 | new_nbmem * sizeof(*new_tmp_events)); | |
914 | if (!new_tmp_events) { | |
022d91ba | 915 | PERROR("realloc agent events"); |
f20baf8e | 916 | ret = -ENOMEM; |
022d91ba | 917 | free(agent_events); |
428de77a | 918 | goto error_unlock; |
f20baf8e | 919 | } |
53efb85a MD |
920 | /* Zero the new memory */ |
921 | memset(new_tmp_events + nbmem, 0, | |
922 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
923 | nbmem = new_nbmem; | |
924 | tmp_events = new_tmp_events; | |
f20baf8e | 925 | } |
022d91ba | 926 | memcpy(tmp_events + count, agent_events, |
53efb85a | 927 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 928 | free(agent_events); |
f20baf8e DG |
929 | count += nb_ev; |
930 | } | |
931 | rcu_read_unlock(); | |
932 | ||
933 | ret = count; | |
934 | *events = tmp_events; | |
aae6255e | 935 | return ret; |
f20baf8e | 936 | |
428de77a MD |
937 | error_unlock: |
938 | rcu_read_unlock(); | |
f20baf8e | 939 | error: |
aae6255e | 940 | free(tmp_events); |
f20baf8e DG |
941 | return ret; |
942 | } | |
943 | ||
944 | /* | |
022d91ba | 945 | * Create a agent app object using the given PID. |
f20baf8e DG |
946 | * |
947 | * Return newly allocated object or else NULL on error. | |
948 | */ | |
fefd409b DG |
949 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
950 | struct lttcomm_sock *sock) | |
f20baf8e | 951 | { |
022d91ba | 952 | struct agent_app *app; |
f20baf8e DG |
953 | |
954 | assert(sock); | |
955 | ||
956 | app = zmalloc(sizeof(*app)); | |
957 | if (!app) { | |
022d91ba | 958 | PERROR("zmalloc agent create"); |
f20baf8e DG |
959 | goto error; |
960 | } | |
961 | ||
962 | app->pid = pid; | |
fefd409b | 963 | app->domain = domain; |
f20baf8e | 964 | app->sock = sock; |
f20baf8e DG |
965 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
966 | ||
967 | error: | |
968 | return app; | |
969 | } | |
970 | ||
971 | /* | |
022d91ba | 972 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
973 | * |
974 | * RCU read side lock MUST be acquired. | |
975 | * | |
976 | * Return object if found else NULL. | |
977 | */ | |
022d91ba | 978 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
979 | { |
980 | struct lttng_ht_node_ulong *node; | |
981 | struct lttng_ht_iter iter; | |
022d91ba | 982 | struct agent_app *app; |
f20baf8e DG |
983 | |
984 | assert(sock >= 0); | |
985 | ||
022d91ba | 986 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
987 | node = lttng_ht_iter_get_node_ulong(&iter); |
988 | if (node == NULL) { | |
989 | goto error; | |
990 | } | |
022d91ba | 991 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 992 | |
022d91ba | 993 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
994 | return app; |
995 | ||
996 | error: | |
022d91ba | 997 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
998 | return NULL; |
999 | } | |
1000 | ||
1001 | /* | |
022d91ba | 1002 | * Add agent application object to the global hash table. |
f20baf8e | 1003 | */ |
022d91ba | 1004 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
1005 | { |
1006 | assert(app); | |
1007 | ||
022d91ba | 1008 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
022d91ba | 1009 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
1010 | } |
1011 | ||
f20baf8e | 1012 | /* |
022d91ba | 1013 | * Delete agent application from the global hash table. |
d558f236 JG |
1014 | * |
1015 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 1016 | */ |
022d91ba | 1017 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
1018 | { |
1019 | int ret; | |
1020 | struct lttng_ht_iter iter; | |
1021 | ||
1022 | assert(app); | |
1023 | ||
022d91ba | 1024 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
1025 | |
1026 | iter.iter.node = &app->node.node; | |
022d91ba | 1027 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
1028 | assert(!ret); |
1029 | } | |
1030 | ||
1031 | /* | |
e785906c | 1032 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 1033 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 1034 | * delayed memory reclaim. |
f20baf8e | 1035 | */ |
022d91ba | 1036 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
1037 | { |
1038 | assert(app); | |
1039 | ||
1040 | if (app->sock) { | |
1041 | app->sock->ops->close(app->sock); | |
1042 | lttcomm_destroy_sock(app->sock); | |
1043 | } | |
1044 | ||
022d91ba | 1045 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
1046 | } |
1047 | ||
0475c50c | 1048 | /* |
022d91ba | 1049 | * Initialize an already allocated agent object. |
0475c50c DG |
1050 | * |
1051 | * Return 0 on success or else a negative errno value. | |
1052 | */ | |
022d91ba | 1053 | int agent_init(struct agent *agt) |
0475c50c DG |
1054 | { |
1055 | int ret; | |
1056 | ||
022d91ba | 1057 | assert(agt); |
0475c50c | 1058 | |
022d91ba DG |
1059 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
1060 | if (!agt->events) { | |
0475c50c DG |
1061 | ret = -ENOMEM; |
1062 | goto error; | |
1063 | } | |
fefd409b | 1064 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c | 1065 | |
bdf64013 | 1066 | CDS_INIT_LIST_HEAD(&agt->app_ctx_list); |
0475c50c DG |
1067 | return 0; |
1068 | ||
1069 | error: | |
1070 | return ret; | |
1071 | } | |
1072 | ||
fefd409b DG |
1073 | /* |
1074 | * Add agent object to the given hash table. | |
1075 | */ | |
1076 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
1077 | { | |
1078 | assert(agt); | |
1079 | assert(ht); | |
1080 | ||
1081 | DBG3("Agent adding from domain %d", agt->domain); | |
1082 | ||
fefd409b | 1083 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
1084 | } |
1085 | ||
1086 | /* | |
1087 | * Create an agent object for the given domain. | |
1088 | * | |
1089 | * Return the allocated agent or NULL on error. | |
1090 | */ | |
1091 | struct agent *agent_create(enum lttng_domain_type domain) | |
1092 | { | |
1093 | int ret; | |
1094 | struct agent *agt; | |
1095 | ||
3b5f70d4 | 1096 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
1097 | if (!agt) { |
1098 | goto error; | |
1099 | } | |
1100 | agt->domain = domain; | |
1101 | ||
1102 | ret = agent_init(agt); | |
1103 | if (ret < 0) { | |
1104 | free(agt); | |
988ae332 | 1105 | agt = NULL; |
fefd409b DG |
1106 | goto error; |
1107 | } | |
1108 | ||
1109 | error: | |
1110 | return agt; | |
1111 | } | |
1112 | ||
0475c50c | 1113 | /* |
51755dc8 JG |
1114 | * Create a newly allocated agent event data structure. |
1115 | * Ownership of filter_expression is taken. | |
0475c50c DG |
1116 | * |
1117 | * Return a new object else NULL on error. | |
1118 | */ | |
022d91ba | 1119 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 1120 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
51755dc8 | 1121 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 1122 | { |
51755dc8 | 1123 | struct agent_event *event = NULL; |
0475c50c | 1124 | |
6b10b3b0 AM |
1125 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
1126 | loglevel value %d and filter %s", | |
40111ba1 JG |
1127 | name, loglevel_type, loglevel_value, |
1128 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 1129 | |
51755dc8 JG |
1130 | if (!name) { |
1131 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
1132 | goto error; |
1133 | } | |
1134 | ||
51755dc8 JG |
1135 | event = zmalloc(sizeof(*event)); |
1136 | if (!event) { | |
1137 | goto error; | |
0475c50c DG |
1138 | } |
1139 | ||
51755dc8 JG |
1140 | strncpy(event->name, name, sizeof(event->name)); |
1141 | event->name[sizeof(event->name) - 1] = '\0'; | |
1142 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 1143 | |
2106efa0 | 1144 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
1145 | event->loglevel_type = loglevel_type; |
1146 | event->filter = filter; | |
1147 | event->filter_expression = filter_expression; | |
0475c50c DG |
1148 | error: |
1149 | return event; | |
1150 | } | |
1151 | ||
1152 | /* | |
022d91ba | 1153 | * Unique add of a agent event to an agent object. |
0475c50c | 1154 | */ |
022d91ba | 1155 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
1156 | { |
1157 | assert(event); | |
022d91ba DG |
1158 | assert(agt); |
1159 | assert(agt->events); | |
0475c50c | 1160 | |
022d91ba | 1161 | DBG3("Agent adding event %s", event->name); |
022d91ba | 1162 | add_unique_agent_event(agt->events, event); |
022d91ba | 1163 | agt->being_used = 1; |
0475c50c DG |
1164 | } |
1165 | ||
bdf64013 JG |
1166 | /* |
1167 | * Unique add of a agent context to an agent object. | |
1168 | */ | |
1169 | int agent_add_context(struct lttng_event_context *ctx, struct agent *agt) | |
1170 | { | |
1171 | int ret = LTTNG_OK; | |
1172 | struct agent_app_ctx *agent_ctx = NULL; | |
1173 | ||
1174 | assert(ctx); | |
1175 | assert(agt); | |
1176 | assert(agt->events); | |
1177 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
1178 | ||
1179 | agent_ctx = create_app_ctx(ctx); | |
1180 | if (!agent_ctx) { | |
1181 | ret = LTTNG_ERR_NOMEM; | |
1182 | goto end; | |
1183 | } | |
1184 | ||
1185 | DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name, | |
1186 | ctx->u.app_ctx.ctx_name); | |
1187 | cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list); | |
1188 | end: | |
1189 | return ret; | |
1190 | } | |
1191 | ||
0475c50c | 1192 | /* |
e261a6cc | 1193 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 1194 | * |
e261a6cc PP |
1195 | * RCU read side lock MUST be acquired. It must be held for the |
1196 | * duration of the iteration. | |
4a4ab2c3 | 1197 | * |
e261a6cc | 1198 | * Sets the given iterator. |
4a4ab2c3 | 1199 | */ |
e261a6cc PP |
1200 | void agent_find_events_by_name(const char *name, struct agent *agt, |
1201 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 1202 | { |
4a4ab2c3 | 1203 | struct lttng_ht *ht; |
022d91ba | 1204 | struct agent_ht_key key; |
4a4ab2c3 DG |
1205 | |
1206 | assert(name); | |
022d91ba DG |
1207 | assert(agt); |
1208 | assert(agt->events); | |
e261a6cc | 1209 | assert(iter); |
4a4ab2c3 | 1210 | |
022d91ba | 1211 | ht = agt->events; |
4a4ab2c3 DG |
1212 | key.name = name; |
1213 | ||
1214 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
1215 | ht_match_event_by_name, &key, &iter->iter); |
1216 | } | |
4a4ab2c3 | 1217 | |
e261a6cc PP |
1218 | /* |
1219 | * Get the next agent event duplicate by name. This should be called | |
1220 | * after a call to agent_find_events_by_name() to iterate on events. | |
1221 | * | |
1222 | * The RCU read lock must be held during the iteration and for as long | |
1223 | * as the object the iterator points to remains in use. | |
1224 | */ | |
1225 | void agent_event_next_duplicate(const char *name, | |
1226 | struct agent *agt, struct lttng_ht_iter* iter) | |
1227 | { | |
1228 | struct agent_ht_key key; | |
4a4ab2c3 | 1229 | |
e261a6cc PP |
1230 | key.name = name; |
1231 | ||
1232 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
1233 | &key, &iter->iter); | |
4a4ab2c3 DG |
1234 | } |
1235 | ||
1236 | /* | |
6b10b3b0 | 1237 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c | 1238 | * |
1e17eae2 JG |
1239 | * RCU read side lock MUST be acquired. It must be kept for as long as |
1240 | * the returned agent_event is used. | |
0475c50c DG |
1241 | * |
1242 | * Return object if found else NULL. | |
1243 | */ | |
a9319624 PP |
1244 | struct agent_event *agent_find_event(const char *name, |
1245 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
6b10b3b0 | 1246 | char *filter_expression, struct agent *agt) |
0475c50c DG |
1247 | { |
1248 | struct lttng_ht_node_str *node; | |
1249 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 1250 | struct lttng_ht *ht; |
022d91ba | 1251 | struct agent_ht_key key; |
0475c50c DG |
1252 | |
1253 | assert(name); | |
022d91ba DG |
1254 | assert(agt); |
1255 | assert(agt->events); | |
0475c50c | 1256 | |
022d91ba | 1257 | ht = agt->events; |
4a4ab2c3 | 1258 | key.name = name; |
2106efa0 | 1259 | key.loglevel_value = loglevel_value; |
a9319624 | 1260 | key.loglevel_type = loglevel_type; |
6b10b3b0 | 1261 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
1262 | |
1263 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1264 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
1265 | node = lttng_ht_iter_get_node_str(&iter); |
1266 | if (node == NULL) { | |
1267 | goto error; | |
1268 | } | |
1269 | ||
022d91ba DG |
1270 | DBG3("Agent event found %s.", name); |
1271 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
1272 | |
1273 | error: | |
a51e817b | 1274 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
1275 | return NULL; |
1276 | } | |
1277 | ||
0475c50c | 1278 | /* |
022d91ba DG |
1279 | * Free given agent event. This event must not be globally visible at this |
1280 | * point (only expected to be used on failure just after event creation). After | |
1281 | * this call, the pointer is not usable anymore. | |
0475c50c | 1282 | */ |
022d91ba | 1283 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
1284 | { |
1285 | assert(event); | |
1286 | ||
971da06a | 1287 | free(event->filter); |
8404118c | 1288 | free(event->filter_expression); |
51755dc8 | 1289 | free(event->exclusion); |
0475c50c DG |
1290 | free(event); |
1291 | } | |
1292 | ||
bdf64013 JG |
1293 | static |
1294 | void destroy_app_ctx_rcu(struct rcu_head *head) | |
1295 | { | |
1296 | struct agent_app_ctx *ctx = | |
1297 | caa_container_of(head, struct agent_app_ctx, rcu_node); | |
1298 | ||
1299 | destroy_app_ctx(ctx); | |
1300 | } | |
1301 | ||
0475c50c | 1302 | /* |
35ed21a5 | 1303 | * Destroy an agent completely. |
0475c50c | 1304 | */ |
022d91ba | 1305 | void agent_destroy(struct agent *agt) |
0475c50c DG |
1306 | { |
1307 | struct lttng_ht_node_str *node; | |
1308 | struct lttng_ht_iter iter; | |
bdf64013 | 1309 | struct agent_app_ctx *ctx; |
0475c50c | 1310 | |
022d91ba | 1311 | assert(agt); |
0475c50c | 1312 | |
022d91ba | 1313 | DBG3("Agent destroy"); |
0475c50c | 1314 | |
0475c50c | 1315 | rcu_read_lock(); |
022d91ba | 1316 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 1317 | int ret; |
022d91ba | 1318 | struct agent_event *event; |
29c0fd4d DG |
1319 | |
1320 | /* | |
bdf64013 JG |
1321 | * When destroying an event, we have to try to disable it on the |
1322 | * agent side so the event stops generating data. The return | |
1323 | * value is not important since we have to continue anyway | |
1324 | * destroying the object. | |
29c0fd4d | 1325 | */ |
022d91ba DG |
1326 | event = caa_container_of(node, struct agent_event, node); |
1327 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1328 | |
022d91ba | 1329 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1330 | assert(!ret); |
022d91ba | 1331 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c | 1332 | } |
0475c50c | 1333 | |
bdf64013 JG |
1334 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
1335 | (void) disable_context(ctx, agt->domain); | |
1336 | cds_list_del(&ctx->list_node); | |
1337 | call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); | |
1338 | } | |
1339 | rcu_read_unlock(); | |
f8be902b | 1340 | ht_cleanup_push(agt->events); |
35ed21a5 | 1341 | free(agt); |
f20baf8e DG |
1342 | } |
1343 | ||
1344 | /* | |
6a4e4039 | 1345 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1346 | */ |
6a4e4039 | 1347 | int agent_app_ht_alloc(void) |
f20baf8e | 1348 | { |
6a4e4039 JG |
1349 | int ret = 0; |
1350 | ||
022d91ba DG |
1351 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1352 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1353 | ret = -1; |
f20baf8e DG |
1354 | } |
1355 | ||
6a4e4039 JG |
1356 | return ret; |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * Destroy a agent application by socket. | |
1361 | */ | |
1362 | void agent_destroy_app_by_sock(int sock) | |
1363 | { | |
1364 | struct agent_app *app; | |
1365 | ||
1366 | assert(sock >= 0); | |
1367 | ||
1368 | /* | |
1369 | * Not finding an application is a very important error that should NEVER | |
1370 | * happen. The hash table deletion is ONLY done through this call when the | |
1371 | * main sessiond thread is torn down. | |
1372 | */ | |
1373 | rcu_read_lock(); | |
1374 | app = agent_find_app_by_sock(sock); | |
1375 | assert(app); | |
1376 | ||
1377 | /* RCU read side lock is assumed to be held by this function. */ | |
1378 | agent_delete_app(app); | |
1379 | ||
1380 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1381 | agent_destroy_app(app); | |
1382 | rcu_read_unlock(); | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * Clean-up the agent app hash table and destroy it. | |
1387 | */ | |
1388 | void agent_app_ht_clean(void) | |
1389 | { | |
1390 | struct lttng_ht_node_ulong *node; | |
1391 | struct lttng_ht_iter iter; | |
1392 | ||
a433283e JG |
1393 | if (!agent_apps_ht_by_sock) { |
1394 | return; | |
1395 | } | |
6a4e4039 JG |
1396 | rcu_read_lock(); |
1397 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1398 | struct agent_app *app; | |
1399 | ||
1400 | app = caa_container_of(node, struct agent_app, node); | |
1401 | agent_destroy_app_by_sock(app->sock->fd); | |
1402 | } | |
1403 | rcu_read_unlock(); | |
1404 | ||
1405 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1406 | } |
1407 | ||
1408 | /* | |
022d91ba | 1409 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1410 | * |
1411 | * Note that this function is most likely to be used with a tracing session | |
1412 | * thus the caller should make sure to hold the appropriate lock(s). | |
1413 | */ | |
022d91ba | 1414 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1415 | { |
1416 | int ret; | |
022d91ba DG |
1417 | struct agent_app *app; |
1418 | struct agent_event *event; | |
f20baf8e | 1419 | struct lttng_ht_iter iter; |
bdf64013 | 1420 | struct agent_app_ctx *ctx; |
f20baf8e | 1421 | |
022d91ba | 1422 | assert(agt); |
f20baf8e DG |
1423 | assert(sock >= 0); |
1424 | ||
022d91ba | 1425 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1426 | |
1427 | rcu_read_lock(); | |
bdf64013 JG |
1428 | app = agent_find_app_by_sock(sock); |
1429 | /* | |
1430 | * We are in the registration path thus if the application is gone, | |
1431 | * there is a serious code flow error. | |
1432 | */ | |
1433 | assert(app); | |
022d91ba | 1434 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1435 | /* Skip event if disabled. */ |
1436 | if (!event->enabled) { | |
1437 | continue; | |
1438 | } | |
1439 | ||
f20baf8e DG |
1440 | ret = enable_event(app, event); |
1441 | if (ret != LTTNG_OK) { | |
022d91ba | 1442 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1443 | event->name, app->pid, app->sock->fd); |
1444 | /* Let's try the others here and don't assume the app is dead. */ | |
1445 | continue; | |
1446 | } | |
1447 | } | |
bdf64013 JG |
1448 | |
1449 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { | |
1450 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); | |
1451 | if (ret != LTTNG_OK) { | |
1452 | DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", | |
1453 | ctx->provider_name, ctx->ctx_name, | |
1454 | app->pid, app->sock->fd); | |
1455 | continue; | |
1456 | } | |
1457 | } | |
1458 | ||
f20baf8e | 1459 | rcu_read_unlock(); |
0475c50c | 1460 | } |