Commit | Line | Data |
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0475c50c DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
0475c50c | 20 | #include <assert.h> |
f20baf8e | 21 | #include <urcu/uatomic.h> |
0475c50c DG |
22 | |
23 | #include <common/common.h> | |
022d91ba | 24 | #include <common/sessiond-comm/agent.h> |
0475c50c | 25 | |
f263b7fd JD |
26 | #include <common/compat/endian.h> |
27 | ||
022d91ba | 28 | #include "agent.h" |
f20baf8e | 29 | #include "ust-app.h" |
0475c50c | 30 | #include "utils.h" |
23c2bd47 JG |
31 | #include "error.h" |
32 | ||
33 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) | |
34 | ||
35 | /* | |
36 | * Human readable agent return code. | |
37 | */ | |
38 | static const char *error_string_array[] = { | |
39 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
40 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
41 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
42 | ||
43 | /* Last element */ | |
44 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
45 | }; | |
46 | ||
47 | static | |
48 | void log_reply_code(uint32_t in_reply_ret_code) | |
49 | { | |
50 | int level = PRINT_DBG3; | |
51 | /* | |
52 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
53 | * sanitized value (used to retrieve the human readable string) and the | |
54 | * original value which is logged as-is. | |
55 | */ | |
56 | uint32_t reply_ret_code = in_reply_ret_code; | |
57 | ||
58 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
59 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
60 | reply_ret_code = AGENT_RET_CODE_NR; | |
61 | level = PRINT_ERR; | |
62 | } | |
63 | ||
64 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
65 | error_string_array[AGENT_RET_CODE_INDEX( | |
66 | reply_ret_code)], | |
67 | in_reply_ret_code); | |
68 | } | |
0475c50c | 69 | |
4a4ab2c3 DG |
70 | /* |
71 | * Match function for the events hash table lookup by name. | |
72 | */ | |
73 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
74 | const void *_key) | |
75 | { | |
022d91ba DG |
76 | struct agent_event *event; |
77 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
78 | |
79 | assert(node); | |
80 | assert(_key); | |
81 | ||
022d91ba | 82 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
83 | key = _key; |
84 | ||
85 | /* Match 1 elements of the key: name. */ | |
86 | ||
87 | /* Event name */ | |
88 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
89 | goto no_match; | |
90 | } | |
91 | /* Match. */ | |
92 | return 1; | |
93 | ||
94 | no_match: | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Match function for the events hash table lookup by name and loglevel. | |
100 | */ | |
101 | static int ht_match_event(struct cds_lfht_node *node, | |
102 | const void *_key) | |
103 | { | |
022d91ba DG |
104 | struct agent_event *event; |
105 | const struct agent_ht_key *key; | |
19a97244 | 106 | int ll_match; |
4a4ab2c3 DG |
107 | |
108 | assert(node); | |
109 | assert(_key); | |
110 | ||
022d91ba | 111 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
112 | key = _key; |
113 | ||
114 | /* Match 2 elements of the key: name and loglevel. */ | |
115 | ||
116 | /* Event name */ | |
117 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
118 | goto no_match; | |
119 | } | |
120 | ||
a9319624 | 121 | /* Event loglevel value and type. */ |
19a97244 PP |
122 | ll_match = loglevels_match(event->loglevel_type, |
123 | event->loglevel_value, key->loglevel_type, | |
124 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
125 | ||
126 | if (!ll_match) { | |
4a4ab2c3 DG |
127 | goto no_match; |
128 | } | |
a9319624 | 129 | |
4a4ab2c3 DG |
130 | return 1; |
131 | ||
132 | no_match: | |
133 | return 0; | |
134 | } | |
135 | ||
136 | /* | |
022d91ba | 137 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 138 | */ |
022d91ba DG |
139 | static void add_unique_agent_event(struct lttng_ht *ht, |
140 | struct agent_event *event) | |
4a4ab2c3 DG |
141 | { |
142 | struct cds_lfht_node *node_ptr; | |
022d91ba | 143 | struct agent_ht_key key; |
4a4ab2c3 DG |
144 | |
145 | assert(ht); | |
146 | assert(ht->ht); | |
147 | assert(event); | |
148 | ||
149 | key.name = event->name; | |
2106efa0 | 150 | key.loglevel_value = event->loglevel_value; |
a9319624 | 151 | key.loglevel_type = event->loglevel_type; |
4a4ab2c3 DG |
152 | |
153 | node_ptr = cds_lfht_add_unique(ht->ht, | |
154 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
155 | ht_match_event, &key, &event->node.node); | |
156 | assert(node_ptr == &event->node.node); | |
157 | } | |
158 | ||
0475c50c | 159 | /* |
022d91ba | 160 | * URCU delayed agent event reclaim. |
0475c50c | 161 | */ |
022d91ba | 162 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
163 | { |
164 | struct lttng_ht_node_str *node = | |
165 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
166 | struct agent_event *event = |
167 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 168 | |
992febc7 | 169 | agent_destroy_event(event); |
0475c50c DG |
170 | } |
171 | ||
f20baf8e | 172 | /* |
022d91ba | 173 | * URCU delayed agent app reclaim. |
f20baf8e | 174 | */ |
022d91ba | 175 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
176 | { |
177 | struct lttng_ht_node_ulong *node = | |
178 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
179 | struct agent_app *app = |
180 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
181 | |
182 | free(app); | |
183 | } | |
184 | ||
185 | /* | |
022d91ba DG |
186 | * Communication with the agent. Send the message header to the given socket in |
187 | * big endian. | |
f20baf8e DG |
188 | * |
189 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
190 | */ | |
191 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
192 | uint32_t cmd, uint32_t cmd_version) | |
193 | { | |
194 | int ret; | |
195 | ssize_t size; | |
022d91ba | 196 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
197 | |
198 | assert(sock); | |
199 | ||
53efb85a | 200 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
201 | msg.data_size = htobe64(data_size); |
202 | msg.cmd = htobe32(cmd); | |
203 | msg.cmd_version = htobe32(cmd_version); | |
204 | ||
205 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
206 | if (size < sizeof(msg)) { | |
207 | ret = -errno; | |
208 | goto error; | |
209 | } | |
210 | ret = 0; | |
211 | ||
212 | error: | |
213 | return ret; | |
214 | } | |
215 | ||
216 | /* | |
022d91ba DG |
217 | * Communication call with the agent. Send the payload to the given socket. The |
218 | * header MUST be sent prior to this call. | |
f20baf8e DG |
219 | * |
220 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
221 | */ | |
222 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
223 | size_t size) | |
224 | { | |
225 | int ret; | |
226 | ssize_t len; | |
227 | ||
228 | assert(sock); | |
229 | assert(data); | |
230 | ||
231 | len = sock->ops->sendmsg(sock, data, size, 0); | |
232 | if (len < size) { | |
233 | ret = -errno; | |
234 | goto error; | |
235 | } | |
236 | ret = 0; | |
237 | ||
238 | error: | |
239 | return ret; | |
240 | } | |
241 | ||
242 | /* | |
022d91ba DG |
243 | * Communication call with the agent. Receive reply from the agent using the |
244 | * given socket. | |
f20baf8e DG |
245 | * |
246 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
247 | */ | |
248 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
249 | { | |
250 | int ret; | |
251 | ssize_t len; | |
252 | ||
253 | assert(sock); | |
254 | assert(buf); | |
255 | ||
256 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
257 | if (len < size) { | |
258 | ret = -errno; | |
259 | goto error; | |
260 | } | |
261 | ret = 0; | |
262 | ||
263 | error: | |
264 | return ret; | |
265 | } | |
266 | ||
3c6a091f | 267 | /* |
428de77a | 268 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
269 | * |
270 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
271 | * On success, the caller is responsible for freeing the memory |
272 | * allocated for "events". | |
3c6a091f | 273 | */ |
022d91ba | 274 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
275 | { |
276 | int ret, i, len = 0, offset = 0; | |
277 | uint32_t nb_event; | |
278 | size_t data_size; | |
d84af1a4 | 279 | uint32_t reply_ret_code; |
3c6a091f | 280 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
281 | struct lttcomm_agent_list_reply *reply = NULL; |
282 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
283 | |
284 | assert(app); | |
285 | assert(app->sock); | |
286 | assert(events); | |
287 | ||
022d91ba | 288 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
289 | app->sock->fd); |
290 | ||
022d91ba | 291 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
292 | if (ret < 0) { |
293 | goto error_io; | |
294 | } | |
295 | ||
296 | /* Get list header so we know how much we'll receive. */ | |
297 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
298 | if (ret < 0) { | |
299 | goto error_io; | |
300 | } | |
301 | ||
d84af1a4 JG |
302 | reply_ret_code = be32toh(reply_hdr.ret_code); |
303 | log_reply_code(reply_ret_code); | |
304 | switch (reply_ret_code) { | |
022d91ba | 305 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
306 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
307 | break; | |
308 | default: | |
3bd9aaeb | 309 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
310 | goto error; |
311 | } | |
312 | ||
313 | reply = zmalloc(data_size); | |
314 | if (!reply) { | |
315 | ret = LTTNG_ERR_NOMEM; | |
316 | goto error; | |
317 | } | |
318 | ||
319 | /* Get the list with the appropriate data size. */ | |
320 | ret = recv_reply(app->sock, reply, data_size); | |
321 | if (ret < 0) { | |
322 | goto error_io; | |
323 | } | |
324 | ||
325 | nb_event = be32toh(reply->nb_event); | |
326 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
327 | if (!tmp_events) { | |
328 | ret = LTTNG_ERR_NOMEM; | |
329 | goto error; | |
330 | } | |
331 | ||
332 | for (i = 0; i < nb_event; i++) { | |
333 | offset += len; | |
334 | strncpy(tmp_events[i].name, reply->payload + offset, | |
335 | sizeof(tmp_events[i].name)); | |
336 | tmp_events[i].pid = app->pid; | |
337 | tmp_events[i].enabled = -1; | |
338 | len = strlen(reply->payload + offset) + 1; | |
339 | } | |
340 | ||
341 | *events = tmp_events; | |
342 | ||
343 | free(reply); | |
344 | return nb_event; | |
345 | ||
346 | error_io: | |
347 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
348 | error: | |
349 | free(reply); | |
350 | free(tmp_events); | |
351 | return -ret; | |
352 | ||
353 | } | |
354 | ||
f20baf8e | 355 | /* |
022d91ba DG |
356 | * Internal enable agent event on a agent application. This function |
357 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
358 | * |
359 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
360 | */ | |
022d91ba | 361 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
362 | { |
363 | int ret; | |
364 | uint64_t data_size; | |
f4f9d4db | 365 | uint32_t reply_ret_code; |
022d91ba DG |
366 | struct lttcomm_agent_enable msg; |
367 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
368 | |
369 | assert(app); | |
370 | assert(app->sock); | |
371 | assert(event); | |
372 | ||
022d91ba | 373 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
374 | app->pid, app->sock->fd); |
375 | ||
376 | data_size = sizeof(msg); | |
377 | ||
022d91ba | 378 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
379 | if (ret < 0) { |
380 | goto error_io; | |
381 | } | |
382 | ||
53efb85a | 383 | memset(&msg, 0, sizeof(msg)); |
2106efa0 | 384 | msg.loglevel_value = event->loglevel_value; |
b2064f54 | 385 | msg.loglevel_type = event->loglevel_type; |
f20baf8e DG |
386 | strncpy(msg.name, event->name, sizeof(msg.name)); |
387 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
388 | if (ret < 0) { | |
389 | goto error_io; | |
390 | } | |
391 | ||
392 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
393 | if (ret < 0) { | |
394 | goto error_io; | |
395 | } | |
396 | ||
f4f9d4db JG |
397 | reply_ret_code = be32toh(reply.ret_code); |
398 | log_reply_code(reply_ret_code); | |
399 | switch (reply_ret_code) { | |
022d91ba | 400 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 401 | break; |
022d91ba | 402 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
403 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
404 | goto error; | |
405 | default: | |
3bd9aaeb | 406 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
407 | goto error; |
408 | } | |
409 | ||
410 | return LTTNG_OK; | |
411 | ||
412 | error_io: | |
413 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
414 | error: | |
415 | return ret; | |
416 | } | |
417 | ||
418 | /* | |
022d91ba DG |
419 | * Internal disable agent event call on a agent application. This function |
420 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
421 | * |
422 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
423 | */ | |
022d91ba | 424 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
425 | { |
426 | int ret; | |
427 | uint64_t data_size; | |
517992f8 | 428 | uint32_t reply_ret_code; |
022d91ba DG |
429 | struct lttcomm_agent_disable msg; |
430 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
431 | |
432 | assert(app); | |
433 | assert(app->sock); | |
434 | assert(event); | |
435 | ||
022d91ba | 436 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
437 | app->pid, app->sock->fd); |
438 | ||
439 | data_size = sizeof(msg); | |
440 | ||
022d91ba | 441 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
442 | if (ret < 0) { |
443 | goto error_io; | |
444 | } | |
445 | ||
53efb85a | 446 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
447 | strncpy(msg.name, event->name, sizeof(msg.name)); |
448 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
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 | ||
517992f8 JG |
458 | reply_ret_code = be32toh(reply.ret_code); |
459 | log_reply_code(reply_ret_code); | |
460 | switch (reply_ret_code) { | |
022d91ba DG |
461 | case AGENT_RET_CODE_SUCCESS: |
462 | break; | |
463 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
464 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
465 | goto error; | |
466 | default: | |
3bd9aaeb | 467 | ret = LTTNG_ERR_UNK; |
022d91ba | 468 | goto error; |
f20baf8e DG |
469 | } |
470 | ||
471 | return LTTNG_OK; | |
472 | ||
473 | error_io: | |
474 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
475 | error: | |
476 | return ret; | |
477 | } | |
478 | ||
1b500e7a | 479 | /* |
022d91ba | 480 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
481 | * |
482 | * Return 0 on success or else a negative value. | |
483 | */ | |
022d91ba | 484 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
485 | { |
486 | assert(app); | |
487 | assert(app->sock); | |
488 | ||
022d91ba | 489 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 490 | |
b26d1f5c | 491 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
492 | } |
493 | ||
f20baf8e | 494 | /* |
022d91ba | 495 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
496 | * daemon. |
497 | * | |
498 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
499 | */ | |
fefd409b DG |
500 | int agent_enable_event(struct agent_event *event, |
501 | enum lttng_domain_type domain) | |
f20baf8e DG |
502 | { |
503 | int ret; | |
022d91ba | 504 | struct agent_app *app; |
f20baf8e DG |
505 | struct lttng_ht_iter iter; |
506 | ||
507 | assert(event); | |
508 | ||
509 | rcu_read_lock(); | |
510 | ||
022d91ba | 511 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 512 | node.node) { |
fefd409b DG |
513 | if (app->domain != domain) { |
514 | continue; | |
515 | } | |
516 | ||
022d91ba | 517 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
518 | ret = enable_event(app, event); |
519 | if (ret != LTTNG_OK) { | |
520 | goto error; | |
521 | } | |
f20baf8e DG |
522 | } |
523 | ||
3c6a091f | 524 | event->enabled = 1; |
f20baf8e DG |
525 | ret = LTTNG_OK; |
526 | ||
527 | error: | |
528 | rcu_read_unlock(); | |
529 | return ret; | |
530 | } | |
531 | ||
532 | /* | |
022d91ba | 533 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
534 | * daemon. |
535 | * | |
536 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
537 | */ | |
fefd409b DG |
538 | int agent_disable_event(struct agent_event *event, |
539 | enum lttng_domain_type domain) | |
f20baf8e | 540 | { |
f1bc0129 | 541 | int ret = LTTNG_OK; |
022d91ba | 542 | struct agent_app *app; |
f20baf8e DG |
543 | struct lttng_ht_iter iter; |
544 | ||
545 | assert(event); | |
f1bc0129 JG |
546 | if (!event->enabled) { |
547 | goto end; | |
548 | } | |
f20baf8e DG |
549 | |
550 | rcu_read_lock(); | |
551 | ||
022d91ba | 552 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 553 | node.node) { |
fefd409b DG |
554 | if (app->domain != domain) { |
555 | continue; | |
556 | } | |
557 | ||
022d91ba | 558 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
559 | ret = disable_event(app, event); |
560 | if (ret != LTTNG_OK) { | |
561 | goto error; | |
562 | } | |
f20baf8e DG |
563 | } |
564 | ||
3c6a091f | 565 | event->enabled = 0; |
f20baf8e DG |
566 | |
567 | error: | |
568 | rcu_read_unlock(); | |
f1bc0129 | 569 | end: |
f20baf8e DG |
570 | return ret; |
571 | } | |
572 | ||
573 | /* | |
022d91ba DG |
574 | * Ask every agent for the list of possible event. Events is allocated with the |
575 | * events of every agent application. | |
f20baf8e DG |
576 | * |
577 | * Return the number of events or else a negative value. | |
578 | */ | |
f60140a1 DG |
579 | int agent_list_events(struct lttng_event **events, |
580 | enum lttng_domain_type domain) | |
f20baf8e DG |
581 | { |
582 | int ret; | |
583 | size_t nbmem, count = 0; | |
022d91ba | 584 | struct agent_app *app; |
aae6255e | 585 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
586 | struct lttng_ht_iter iter; |
587 | ||
588 | assert(events); | |
589 | ||
0e115563 DG |
590 | DBG2("Agent listing events for domain %d", domain); |
591 | ||
f20baf8e DG |
592 | nbmem = UST_APP_EVENT_LIST_SIZE; |
593 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
594 | if (!tmp_events) { | |
022d91ba | 595 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
596 | ret = -ENOMEM; |
597 | goto error; | |
598 | } | |
599 | ||
600 | rcu_read_lock(); | |
022d91ba | 601 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
602 | node.node) { |
603 | ssize_t nb_ev; | |
022d91ba | 604 | struct lttng_event *agent_events; |
f20baf8e | 605 | |
f60140a1 DG |
606 | /* Skip domain not asked by the list. */ |
607 | if (app->domain != domain) { | |
608 | continue; | |
609 | } | |
610 | ||
022d91ba | 611 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
612 | if (nb_ev < 0) { |
613 | ret = nb_ev; | |
428de77a | 614 | goto error_unlock; |
f20baf8e DG |
615 | } |
616 | ||
53efb85a | 617 | if (count + nb_ev > nbmem) { |
f20baf8e | 618 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
619 | struct lttng_event *new_tmp_events; |
620 | size_t new_nbmem; | |
621 | ||
622 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 623 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
624 | nbmem, new_nbmem); |
625 | new_tmp_events = realloc(tmp_events, | |
626 | new_nbmem * sizeof(*new_tmp_events)); | |
627 | if (!new_tmp_events) { | |
022d91ba | 628 | PERROR("realloc agent events"); |
f20baf8e | 629 | ret = -ENOMEM; |
022d91ba | 630 | free(agent_events); |
428de77a | 631 | goto error_unlock; |
f20baf8e | 632 | } |
53efb85a MD |
633 | /* Zero the new memory */ |
634 | memset(new_tmp_events + nbmem, 0, | |
635 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
636 | nbmem = new_nbmem; | |
637 | tmp_events = new_tmp_events; | |
f20baf8e | 638 | } |
022d91ba | 639 | memcpy(tmp_events + count, agent_events, |
53efb85a | 640 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 641 | free(agent_events); |
f20baf8e DG |
642 | count += nb_ev; |
643 | } | |
644 | rcu_read_unlock(); | |
645 | ||
646 | ret = count; | |
647 | *events = tmp_events; | |
aae6255e | 648 | return ret; |
f20baf8e | 649 | |
428de77a MD |
650 | error_unlock: |
651 | rcu_read_unlock(); | |
f20baf8e | 652 | error: |
aae6255e | 653 | free(tmp_events); |
f20baf8e DG |
654 | return ret; |
655 | } | |
656 | ||
657 | /* | |
022d91ba | 658 | * Create a agent app object using the given PID. |
f20baf8e DG |
659 | * |
660 | * Return newly allocated object or else NULL on error. | |
661 | */ | |
fefd409b DG |
662 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
663 | struct lttcomm_sock *sock) | |
f20baf8e | 664 | { |
022d91ba | 665 | struct agent_app *app; |
f20baf8e DG |
666 | |
667 | assert(sock); | |
668 | ||
669 | app = zmalloc(sizeof(*app)); | |
670 | if (!app) { | |
022d91ba | 671 | PERROR("zmalloc agent create"); |
f20baf8e DG |
672 | goto error; |
673 | } | |
674 | ||
675 | app->pid = pid; | |
fefd409b | 676 | app->domain = domain; |
f20baf8e | 677 | app->sock = sock; |
f20baf8e DG |
678 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
679 | ||
680 | error: | |
681 | return app; | |
682 | } | |
683 | ||
684 | /* | |
022d91ba | 685 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
686 | * |
687 | * RCU read side lock MUST be acquired. | |
688 | * | |
689 | * Return object if found else NULL. | |
690 | */ | |
022d91ba | 691 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
692 | { |
693 | struct lttng_ht_node_ulong *node; | |
694 | struct lttng_ht_iter iter; | |
022d91ba | 695 | struct agent_app *app; |
f20baf8e DG |
696 | |
697 | assert(sock >= 0); | |
698 | ||
022d91ba | 699 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
700 | node = lttng_ht_iter_get_node_ulong(&iter); |
701 | if (node == NULL) { | |
702 | goto error; | |
703 | } | |
022d91ba | 704 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 705 | |
022d91ba | 706 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
707 | return app; |
708 | ||
709 | error: | |
022d91ba | 710 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
711 | return NULL; |
712 | } | |
713 | ||
714 | /* | |
022d91ba | 715 | * Add agent application object to the global hash table. |
f20baf8e | 716 | */ |
022d91ba | 717 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
718 | { |
719 | assert(app); | |
720 | ||
022d91ba | 721 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
022d91ba | 722 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
723 | } |
724 | ||
f20baf8e | 725 | /* |
022d91ba | 726 | * Delete agent application from the global hash table. |
d558f236 JG |
727 | * |
728 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 729 | */ |
022d91ba | 730 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
731 | { |
732 | int ret; | |
733 | struct lttng_ht_iter iter; | |
734 | ||
735 | assert(app); | |
736 | ||
022d91ba | 737 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
738 | |
739 | iter.iter.node = &app->node.node; | |
022d91ba | 740 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
741 | assert(!ret); |
742 | } | |
743 | ||
744 | /* | |
e785906c | 745 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 746 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 747 | * delayed memory reclaim. |
f20baf8e | 748 | */ |
022d91ba | 749 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
750 | { |
751 | assert(app); | |
752 | ||
753 | if (app->sock) { | |
754 | app->sock->ops->close(app->sock); | |
755 | lttcomm_destroy_sock(app->sock); | |
756 | } | |
757 | ||
022d91ba | 758 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
759 | } |
760 | ||
0475c50c | 761 | /* |
022d91ba | 762 | * Initialize an already allocated agent object. |
0475c50c DG |
763 | * |
764 | * Return 0 on success or else a negative errno value. | |
765 | */ | |
022d91ba | 766 | int agent_init(struct agent *agt) |
0475c50c DG |
767 | { |
768 | int ret; | |
769 | ||
022d91ba | 770 | assert(agt); |
0475c50c | 771 | |
022d91ba DG |
772 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
773 | if (!agt->events) { | |
0475c50c DG |
774 | ret = -ENOMEM; |
775 | goto error; | |
776 | } | |
fefd409b | 777 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
778 | |
779 | return 0; | |
780 | ||
781 | error: | |
782 | return ret; | |
783 | } | |
784 | ||
fefd409b DG |
785 | /* |
786 | * Add agent object to the given hash table. | |
787 | */ | |
788 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
789 | { | |
790 | assert(agt); | |
791 | assert(ht); | |
792 | ||
793 | DBG3("Agent adding from domain %d", agt->domain); | |
794 | ||
fefd409b | 795 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
796 | } |
797 | ||
798 | /* | |
799 | * Create an agent object for the given domain. | |
800 | * | |
801 | * Return the allocated agent or NULL on error. | |
802 | */ | |
803 | struct agent *agent_create(enum lttng_domain_type domain) | |
804 | { | |
805 | int ret; | |
806 | struct agent *agt; | |
807 | ||
3b5f70d4 | 808 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
809 | if (!agt) { |
810 | goto error; | |
811 | } | |
812 | agt->domain = domain; | |
813 | ||
814 | ret = agent_init(agt); | |
815 | if (ret < 0) { | |
816 | free(agt); | |
988ae332 | 817 | agt = NULL; |
fefd409b DG |
818 | goto error; |
819 | } | |
820 | ||
821 | error: | |
822 | return agt; | |
823 | } | |
824 | ||
0475c50c | 825 | /* |
51755dc8 JG |
826 | * Create a newly allocated agent event data structure. |
827 | * Ownership of filter_expression is taken. | |
0475c50c DG |
828 | * |
829 | * Return a new object else NULL on error. | |
830 | */ | |
022d91ba | 831 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 832 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
51755dc8 | 833 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 834 | { |
51755dc8 | 835 | struct agent_event *event = NULL; |
0475c50c | 836 | |
a9319624 PP |
837 | DBG3("Agent create new event with name %s, loglevel type %d and loglevel value %d", |
838 | name, loglevel_type, loglevel_value); | |
0475c50c | 839 | |
51755dc8 JG |
840 | if (!name) { |
841 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
842 | goto error; |
843 | } | |
844 | ||
51755dc8 JG |
845 | event = zmalloc(sizeof(*event)); |
846 | if (!event) { | |
847 | goto error; | |
0475c50c DG |
848 | } |
849 | ||
51755dc8 JG |
850 | strncpy(event->name, name, sizeof(event->name)); |
851 | event->name[sizeof(event->name) - 1] = '\0'; | |
852 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 853 | |
2106efa0 | 854 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
855 | event->loglevel_type = loglevel_type; |
856 | event->filter = filter; | |
857 | event->filter_expression = filter_expression; | |
0475c50c DG |
858 | error: |
859 | return event; | |
860 | } | |
861 | ||
862 | /* | |
022d91ba | 863 | * Unique add of a agent event to an agent object. |
0475c50c | 864 | */ |
022d91ba | 865 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
866 | { |
867 | assert(event); | |
022d91ba DG |
868 | assert(agt); |
869 | assert(agt->events); | |
0475c50c | 870 | |
022d91ba | 871 | DBG3("Agent adding event %s", event->name); |
022d91ba | 872 | add_unique_agent_event(agt->events, event); |
022d91ba | 873 | agt->being_used = 1; |
0475c50c DG |
874 | } |
875 | ||
876 | /* | |
e261a6cc | 877 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 878 | * |
e261a6cc PP |
879 | * RCU read side lock MUST be acquired. It must be held for the |
880 | * duration of the iteration. | |
4a4ab2c3 | 881 | * |
e261a6cc | 882 | * Sets the given iterator. |
4a4ab2c3 | 883 | */ |
e261a6cc PP |
884 | void agent_find_events_by_name(const char *name, struct agent *agt, |
885 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 886 | { |
4a4ab2c3 | 887 | struct lttng_ht *ht; |
022d91ba | 888 | struct agent_ht_key key; |
4a4ab2c3 DG |
889 | |
890 | assert(name); | |
022d91ba DG |
891 | assert(agt); |
892 | assert(agt->events); | |
e261a6cc | 893 | assert(iter); |
4a4ab2c3 | 894 | |
022d91ba | 895 | ht = agt->events; |
4a4ab2c3 DG |
896 | key.name = name; |
897 | ||
898 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
899 | ht_match_event_by_name, &key, &iter->iter); |
900 | } | |
4a4ab2c3 | 901 | |
e261a6cc PP |
902 | /* |
903 | * Get the next agent event duplicate by name. This should be called | |
904 | * after a call to agent_find_events_by_name() to iterate on events. | |
905 | * | |
906 | * The RCU read lock must be held during the iteration and for as long | |
907 | * as the object the iterator points to remains in use. | |
908 | */ | |
909 | void agent_event_next_duplicate(const char *name, | |
910 | struct agent *agt, struct lttng_ht_iter* iter) | |
911 | { | |
912 | struct agent_ht_key key; | |
4a4ab2c3 | 913 | |
e261a6cc PP |
914 | key.name = name; |
915 | ||
916 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
917 | &key, &iter->iter); | |
4a4ab2c3 DG |
918 | } |
919 | ||
920 | /* | |
022d91ba | 921 | * Find a agent event in the given agent using name and loglevel. |
0475c50c | 922 | * |
1e17eae2 JG |
923 | * RCU read side lock MUST be acquired. It must be kept for as long as |
924 | * the returned agent_event is used. | |
0475c50c DG |
925 | * |
926 | * Return object if found else NULL. | |
927 | */ | |
a9319624 PP |
928 | struct agent_event *agent_find_event(const char *name, |
929 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
022d91ba | 930 | struct agent *agt) |
0475c50c DG |
931 | { |
932 | struct lttng_ht_node_str *node; | |
933 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 934 | struct lttng_ht *ht; |
022d91ba | 935 | struct agent_ht_key key; |
0475c50c DG |
936 | |
937 | assert(name); | |
022d91ba DG |
938 | assert(agt); |
939 | assert(agt->events); | |
0475c50c | 940 | |
022d91ba | 941 | ht = agt->events; |
4a4ab2c3 | 942 | key.name = name; |
2106efa0 | 943 | key.loglevel_value = loglevel_value; |
a9319624 | 944 | key.loglevel_type = loglevel_type; |
4a4ab2c3 DG |
945 | |
946 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
947 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
948 | node = lttng_ht_iter_get_node_str(&iter); |
949 | if (node == NULL) { | |
950 | goto error; | |
951 | } | |
952 | ||
022d91ba DG |
953 | DBG3("Agent event found %s.", name); |
954 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
955 | |
956 | error: | |
a51e817b | 957 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
958 | return NULL; |
959 | } | |
960 | ||
0475c50c | 961 | /* |
022d91ba DG |
962 | * Free given agent event. This event must not be globally visible at this |
963 | * point (only expected to be used on failure just after event creation). After | |
964 | * this call, the pointer is not usable anymore. | |
0475c50c | 965 | */ |
022d91ba | 966 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
967 | { |
968 | assert(event); | |
969 | ||
971da06a | 970 | free(event->filter); |
8404118c | 971 | free(event->filter_expression); |
51755dc8 | 972 | free(event->exclusion); |
0475c50c DG |
973 | free(event); |
974 | } | |
975 | ||
976 | /* | |
35ed21a5 | 977 | * Destroy an agent completely. |
0475c50c | 978 | */ |
022d91ba | 979 | void agent_destroy(struct agent *agt) |
0475c50c DG |
980 | { |
981 | struct lttng_ht_node_str *node; | |
982 | struct lttng_ht_iter iter; | |
983 | ||
022d91ba | 984 | assert(agt); |
0475c50c | 985 | |
022d91ba | 986 | DBG3("Agent destroy"); |
0475c50c | 987 | |
0475c50c | 988 | rcu_read_lock(); |
022d91ba | 989 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 990 | int ret; |
022d91ba | 991 | struct agent_event *event; |
29c0fd4d DG |
992 | |
993 | /* | |
994 | * When destroying an event, we have to try to disable it on the agent | |
995 | * side so the event stops generating data. The return value is not | |
996 | * important since we have to continue anyway destroying the object. | |
997 | */ | |
022d91ba DG |
998 | event = caa_container_of(node, struct agent_event, node); |
999 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1000 | |
022d91ba | 1001 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1002 | assert(!ret); |
022d91ba | 1003 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
1004 | } |
1005 | rcu_read_unlock(); | |
1006 | ||
f8be902b | 1007 | ht_cleanup_push(agt->events); |
35ed21a5 | 1008 | free(agt); |
f20baf8e DG |
1009 | } |
1010 | ||
1011 | /* | |
6a4e4039 | 1012 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1013 | */ |
6a4e4039 | 1014 | int agent_app_ht_alloc(void) |
f20baf8e | 1015 | { |
6a4e4039 JG |
1016 | int ret = 0; |
1017 | ||
022d91ba DG |
1018 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1019 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1020 | ret = -1; |
f20baf8e DG |
1021 | } |
1022 | ||
6a4e4039 JG |
1023 | return ret; |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * Destroy a agent application by socket. | |
1028 | */ | |
1029 | void agent_destroy_app_by_sock(int sock) | |
1030 | { | |
1031 | struct agent_app *app; | |
1032 | ||
1033 | assert(sock >= 0); | |
1034 | ||
1035 | /* | |
1036 | * Not finding an application is a very important error that should NEVER | |
1037 | * happen. The hash table deletion is ONLY done through this call when the | |
1038 | * main sessiond thread is torn down. | |
1039 | */ | |
1040 | rcu_read_lock(); | |
1041 | app = agent_find_app_by_sock(sock); | |
1042 | assert(app); | |
1043 | ||
1044 | /* RCU read side lock is assumed to be held by this function. */ | |
1045 | agent_delete_app(app); | |
1046 | ||
1047 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1048 | agent_destroy_app(app); | |
1049 | rcu_read_unlock(); | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Clean-up the agent app hash table and destroy it. | |
1054 | */ | |
1055 | void agent_app_ht_clean(void) | |
1056 | { | |
1057 | struct lttng_ht_node_ulong *node; | |
1058 | struct lttng_ht_iter iter; | |
1059 | ||
a433283e JG |
1060 | if (!agent_apps_ht_by_sock) { |
1061 | return; | |
1062 | } | |
6a4e4039 JG |
1063 | rcu_read_lock(); |
1064 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1065 | struct agent_app *app; | |
1066 | ||
1067 | app = caa_container_of(node, struct agent_app, node); | |
1068 | agent_destroy_app_by_sock(app->sock->fd); | |
1069 | } | |
1070 | rcu_read_unlock(); | |
1071 | ||
1072 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1073 | } |
1074 | ||
1075 | /* | |
022d91ba | 1076 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1077 | * |
1078 | * Note that this function is most likely to be used with a tracing session | |
1079 | * thus the caller should make sure to hold the appropriate lock(s). | |
1080 | */ | |
022d91ba | 1081 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1082 | { |
1083 | int ret; | |
022d91ba DG |
1084 | struct agent_app *app; |
1085 | struct agent_event *event; | |
f20baf8e DG |
1086 | struct lttng_ht_iter iter; |
1087 | ||
022d91ba | 1088 | assert(agt); |
f20baf8e DG |
1089 | assert(sock >= 0); |
1090 | ||
022d91ba | 1091 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1092 | |
1093 | rcu_read_lock(); | |
022d91ba | 1094 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1095 | /* Skip event if disabled. */ |
1096 | if (!event->enabled) { | |
1097 | continue; | |
1098 | } | |
1099 | ||
022d91ba | 1100 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1101 | /* |
1102 | * We are in the registration path thus if the application is gone, | |
1103 | * there is a serious code flow error. | |
1104 | */ | |
1105 | assert(app); | |
1106 | ||
1107 | ret = enable_event(app, event); | |
1108 | if (ret != LTTNG_OK) { | |
022d91ba | 1109 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1110 | event->name, app->pid, app->sock->fd); |
1111 | /* Let's try the others here and don't assume the app is dead. */ | |
1112 | continue; | |
1113 | } | |
1114 | } | |
1115 | rcu_read_unlock(); | |
0475c50c | 1116 | } |