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