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; | |
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 | ||
2106efa0 | 120 | if (event->loglevel_value != key->loglevel_value) { |
4a4ab2c3 | 121 | if (event->loglevel_type == LTTNG_EVENT_LOGLEVEL_ALL && |
2106efa0 PP |
122 | key->loglevel_value == 0 && |
123 | event->loglevel_value == -1) { | |
4a4ab2c3 DG |
124 | goto match; |
125 | } | |
126 | goto no_match; | |
127 | } | |
128 | match: | |
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; |
4a4ab2c3 DG |
150 | |
151 | node_ptr = cds_lfht_add_unique(ht->ht, | |
152 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
153 | ht_match_event, &key, &event->node.node); | |
154 | assert(node_ptr == &event->node.node); | |
155 | } | |
156 | ||
0475c50c | 157 | /* |
022d91ba | 158 | * URCU delayed agent event reclaim. |
0475c50c | 159 | */ |
022d91ba | 160 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
161 | { |
162 | struct lttng_ht_node_str *node = | |
163 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
164 | struct agent_event *event = |
165 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 166 | |
992febc7 | 167 | agent_destroy_event(event); |
0475c50c DG |
168 | } |
169 | ||
f20baf8e | 170 | /* |
022d91ba | 171 | * URCU delayed agent app reclaim. |
f20baf8e | 172 | */ |
022d91ba | 173 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
174 | { |
175 | struct lttng_ht_node_ulong *node = | |
176 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
177 | struct agent_app *app = |
178 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
179 | |
180 | free(app); | |
181 | } | |
182 | ||
183 | /* | |
022d91ba DG |
184 | * Communication with the agent. Send the message header to the given socket in |
185 | * big endian. | |
f20baf8e DG |
186 | * |
187 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
188 | */ | |
189 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
190 | uint32_t cmd, uint32_t cmd_version) | |
191 | { | |
192 | int ret; | |
193 | ssize_t size; | |
022d91ba | 194 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
195 | |
196 | assert(sock); | |
197 | ||
53efb85a | 198 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
199 | msg.data_size = htobe64(data_size); |
200 | msg.cmd = htobe32(cmd); | |
201 | msg.cmd_version = htobe32(cmd_version); | |
202 | ||
203 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
204 | if (size < sizeof(msg)) { | |
205 | ret = -errno; | |
206 | goto error; | |
207 | } | |
208 | ret = 0; | |
209 | ||
210 | error: | |
211 | return ret; | |
212 | } | |
213 | ||
214 | /* | |
022d91ba DG |
215 | * Communication call with the agent. Send the payload to the given socket. The |
216 | * header MUST be sent prior to this call. | |
f20baf8e DG |
217 | * |
218 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
219 | */ | |
220 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
221 | size_t size) | |
222 | { | |
223 | int ret; | |
224 | ssize_t len; | |
225 | ||
226 | assert(sock); | |
227 | assert(data); | |
228 | ||
229 | len = sock->ops->sendmsg(sock, data, size, 0); | |
230 | if (len < size) { | |
231 | ret = -errno; | |
232 | goto error; | |
233 | } | |
234 | ret = 0; | |
235 | ||
236 | error: | |
237 | return ret; | |
238 | } | |
239 | ||
240 | /* | |
022d91ba DG |
241 | * Communication call with the agent. Receive reply from the agent using the |
242 | * given socket. | |
f20baf8e DG |
243 | * |
244 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
245 | */ | |
246 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
247 | { | |
248 | int ret; | |
249 | ssize_t len; | |
250 | ||
251 | assert(sock); | |
252 | assert(buf); | |
253 | ||
254 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
255 | if (len < size) { | |
256 | ret = -errno; | |
257 | goto error; | |
258 | } | |
259 | ret = 0; | |
260 | ||
261 | error: | |
262 | return ret; | |
263 | } | |
264 | ||
3c6a091f | 265 | /* |
428de77a | 266 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
267 | * |
268 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
269 | * On success, the caller is responsible for freeing the memory |
270 | * allocated for "events". | |
3c6a091f | 271 | */ |
022d91ba | 272 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
273 | { |
274 | int ret, i, len = 0, offset = 0; | |
275 | uint32_t nb_event; | |
276 | size_t data_size; | |
d84af1a4 | 277 | uint32_t reply_ret_code; |
3c6a091f | 278 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
279 | struct lttcomm_agent_list_reply *reply = NULL; |
280 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
281 | |
282 | assert(app); | |
283 | assert(app->sock); | |
284 | assert(events); | |
285 | ||
022d91ba | 286 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
287 | app->sock->fd); |
288 | ||
022d91ba | 289 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
290 | if (ret < 0) { |
291 | goto error_io; | |
292 | } | |
293 | ||
294 | /* Get list header so we know how much we'll receive. */ | |
295 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
296 | if (ret < 0) { | |
297 | goto error_io; | |
298 | } | |
299 | ||
d84af1a4 JG |
300 | reply_ret_code = be32toh(reply_hdr.ret_code); |
301 | log_reply_code(reply_ret_code); | |
302 | switch (reply_ret_code) { | |
022d91ba | 303 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
304 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
305 | break; | |
306 | default: | |
3bd9aaeb | 307 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
308 | goto error; |
309 | } | |
310 | ||
311 | reply = zmalloc(data_size); | |
312 | if (!reply) { | |
313 | ret = LTTNG_ERR_NOMEM; | |
314 | goto error; | |
315 | } | |
316 | ||
317 | /* Get the list with the appropriate data size. */ | |
318 | ret = recv_reply(app->sock, reply, data_size); | |
319 | if (ret < 0) { | |
320 | goto error_io; | |
321 | } | |
322 | ||
323 | nb_event = be32toh(reply->nb_event); | |
324 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
325 | if (!tmp_events) { | |
326 | ret = LTTNG_ERR_NOMEM; | |
327 | goto error; | |
328 | } | |
329 | ||
330 | for (i = 0; i < nb_event; i++) { | |
331 | offset += len; | |
332 | strncpy(tmp_events[i].name, reply->payload + offset, | |
333 | sizeof(tmp_events[i].name)); | |
334 | tmp_events[i].pid = app->pid; | |
335 | tmp_events[i].enabled = -1; | |
336 | len = strlen(reply->payload + offset) + 1; | |
337 | } | |
338 | ||
339 | *events = tmp_events; | |
340 | ||
341 | free(reply); | |
342 | return nb_event; | |
343 | ||
344 | error_io: | |
345 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
346 | error: | |
347 | free(reply); | |
348 | free(tmp_events); | |
349 | return -ret; | |
350 | ||
351 | } | |
352 | ||
f20baf8e | 353 | /* |
022d91ba DG |
354 | * Internal enable agent event on a agent application. This function |
355 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
356 | * |
357 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
358 | */ | |
022d91ba | 359 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
360 | { |
361 | int ret; | |
362 | uint64_t data_size; | |
f4f9d4db | 363 | uint32_t reply_ret_code; |
022d91ba DG |
364 | struct lttcomm_agent_enable msg; |
365 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
366 | |
367 | assert(app); | |
368 | assert(app->sock); | |
369 | assert(event); | |
370 | ||
022d91ba | 371 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
372 | app->pid, app->sock->fd); |
373 | ||
374 | data_size = sizeof(msg); | |
375 | ||
022d91ba | 376 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
377 | if (ret < 0) { |
378 | goto error_io; | |
379 | } | |
380 | ||
53efb85a | 381 | memset(&msg, 0, sizeof(msg)); |
2106efa0 | 382 | msg.loglevel_value = event->loglevel_value; |
b2064f54 | 383 | msg.loglevel_type = event->loglevel_type; |
f20baf8e DG |
384 | strncpy(msg.name, event->name, sizeof(msg.name)); |
385 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
386 | if (ret < 0) { | |
387 | goto error_io; | |
388 | } | |
389 | ||
390 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
391 | if (ret < 0) { | |
392 | goto error_io; | |
393 | } | |
394 | ||
f4f9d4db JG |
395 | reply_ret_code = be32toh(reply.ret_code); |
396 | log_reply_code(reply_ret_code); | |
397 | switch (reply_ret_code) { | |
022d91ba | 398 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 399 | break; |
022d91ba | 400 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
401 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
402 | goto error; | |
403 | default: | |
3bd9aaeb | 404 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
405 | goto error; |
406 | } | |
407 | ||
408 | return LTTNG_OK; | |
409 | ||
410 | error_io: | |
411 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
412 | error: | |
413 | return ret; | |
414 | } | |
415 | ||
416 | /* | |
022d91ba DG |
417 | * Internal disable agent event call on a agent application. This function |
418 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
419 | * |
420 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
421 | */ | |
022d91ba | 422 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
423 | { |
424 | int ret; | |
425 | uint64_t data_size; | |
517992f8 | 426 | uint32_t reply_ret_code; |
022d91ba DG |
427 | struct lttcomm_agent_disable msg; |
428 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
429 | |
430 | assert(app); | |
431 | assert(app->sock); | |
432 | assert(event); | |
433 | ||
022d91ba | 434 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
435 | app->pid, app->sock->fd); |
436 | ||
437 | data_size = sizeof(msg); | |
438 | ||
022d91ba | 439 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
440 | if (ret < 0) { |
441 | goto error_io; | |
442 | } | |
443 | ||
53efb85a | 444 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
445 | strncpy(msg.name, event->name, sizeof(msg.name)); |
446 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
447 | if (ret < 0) { | |
448 | goto error_io; | |
449 | } | |
450 | ||
451 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
452 | if (ret < 0) { | |
453 | goto error_io; | |
454 | } | |
455 | ||
517992f8 JG |
456 | reply_ret_code = be32toh(reply.ret_code); |
457 | log_reply_code(reply_ret_code); | |
458 | switch (reply_ret_code) { | |
022d91ba DG |
459 | case AGENT_RET_CODE_SUCCESS: |
460 | break; | |
461 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
462 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
463 | goto error; | |
464 | default: | |
3bd9aaeb | 465 | ret = LTTNG_ERR_UNK; |
022d91ba | 466 | goto error; |
f20baf8e DG |
467 | } |
468 | ||
469 | return LTTNG_OK; | |
470 | ||
471 | error_io: | |
472 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
473 | error: | |
474 | return ret; | |
475 | } | |
476 | ||
1b500e7a | 477 | /* |
022d91ba | 478 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
479 | * |
480 | * Return 0 on success or else a negative value. | |
481 | */ | |
022d91ba | 482 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
483 | { |
484 | assert(app); | |
485 | assert(app->sock); | |
486 | ||
022d91ba | 487 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 488 | |
b26d1f5c | 489 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
490 | } |
491 | ||
f20baf8e | 492 | /* |
022d91ba | 493 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
494 | * daemon. |
495 | * | |
496 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
497 | */ | |
fefd409b DG |
498 | int agent_enable_event(struct agent_event *event, |
499 | enum lttng_domain_type domain) | |
f20baf8e DG |
500 | { |
501 | int ret; | |
022d91ba | 502 | struct agent_app *app; |
f20baf8e DG |
503 | struct lttng_ht_iter iter; |
504 | ||
505 | assert(event); | |
506 | ||
507 | rcu_read_lock(); | |
508 | ||
022d91ba | 509 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 510 | node.node) { |
fefd409b DG |
511 | if (app->domain != domain) { |
512 | continue; | |
513 | } | |
514 | ||
022d91ba | 515 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
516 | ret = enable_event(app, event); |
517 | if (ret != LTTNG_OK) { | |
518 | goto error; | |
519 | } | |
f20baf8e DG |
520 | } |
521 | ||
3c6a091f | 522 | event->enabled = 1; |
f20baf8e DG |
523 | ret = LTTNG_OK; |
524 | ||
525 | error: | |
526 | rcu_read_unlock(); | |
527 | return ret; | |
528 | } | |
529 | ||
530 | /* | |
022d91ba | 531 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
532 | * daemon. |
533 | * | |
534 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
535 | */ | |
fefd409b DG |
536 | int agent_disable_event(struct agent_event *event, |
537 | enum lttng_domain_type domain) | |
f20baf8e | 538 | { |
f1bc0129 | 539 | int ret = LTTNG_OK; |
022d91ba | 540 | struct agent_app *app; |
f20baf8e DG |
541 | struct lttng_ht_iter iter; |
542 | ||
543 | assert(event); | |
f1bc0129 JG |
544 | if (!event->enabled) { |
545 | goto end; | |
546 | } | |
f20baf8e DG |
547 | |
548 | rcu_read_lock(); | |
549 | ||
022d91ba | 550 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 551 | node.node) { |
fefd409b DG |
552 | if (app->domain != domain) { |
553 | continue; | |
554 | } | |
555 | ||
022d91ba | 556 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
557 | ret = disable_event(app, event); |
558 | if (ret != LTTNG_OK) { | |
559 | goto error; | |
560 | } | |
f20baf8e DG |
561 | } |
562 | ||
3c6a091f | 563 | event->enabled = 0; |
f20baf8e DG |
564 | |
565 | error: | |
566 | rcu_read_unlock(); | |
f1bc0129 | 567 | end: |
f20baf8e DG |
568 | return ret; |
569 | } | |
570 | ||
571 | /* | |
022d91ba DG |
572 | * Ask every agent for the list of possible event. Events is allocated with the |
573 | * events of every agent application. | |
f20baf8e DG |
574 | * |
575 | * Return the number of events or else a negative value. | |
576 | */ | |
f60140a1 DG |
577 | int agent_list_events(struct lttng_event **events, |
578 | enum lttng_domain_type domain) | |
f20baf8e DG |
579 | { |
580 | int ret; | |
581 | size_t nbmem, count = 0; | |
022d91ba | 582 | struct agent_app *app; |
aae6255e | 583 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
584 | struct lttng_ht_iter iter; |
585 | ||
586 | assert(events); | |
587 | ||
0e115563 DG |
588 | DBG2("Agent listing events for domain %d", domain); |
589 | ||
f20baf8e DG |
590 | nbmem = UST_APP_EVENT_LIST_SIZE; |
591 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
592 | if (!tmp_events) { | |
022d91ba | 593 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
594 | ret = -ENOMEM; |
595 | goto error; | |
596 | } | |
597 | ||
598 | rcu_read_lock(); | |
022d91ba | 599 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
600 | node.node) { |
601 | ssize_t nb_ev; | |
022d91ba | 602 | struct lttng_event *agent_events; |
f20baf8e | 603 | |
f60140a1 DG |
604 | /* Skip domain not asked by the list. */ |
605 | if (app->domain != domain) { | |
606 | continue; | |
607 | } | |
608 | ||
022d91ba | 609 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
610 | if (nb_ev < 0) { |
611 | ret = nb_ev; | |
428de77a | 612 | goto error_unlock; |
f20baf8e DG |
613 | } |
614 | ||
53efb85a | 615 | if (count + nb_ev > nbmem) { |
f20baf8e | 616 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
617 | struct lttng_event *new_tmp_events; |
618 | size_t new_nbmem; | |
619 | ||
620 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 621 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
622 | nbmem, new_nbmem); |
623 | new_tmp_events = realloc(tmp_events, | |
624 | new_nbmem * sizeof(*new_tmp_events)); | |
625 | if (!new_tmp_events) { | |
022d91ba | 626 | PERROR("realloc agent events"); |
f20baf8e | 627 | ret = -ENOMEM; |
022d91ba | 628 | free(agent_events); |
428de77a | 629 | goto error_unlock; |
f20baf8e | 630 | } |
53efb85a MD |
631 | /* Zero the new memory */ |
632 | memset(new_tmp_events + nbmem, 0, | |
633 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
634 | nbmem = new_nbmem; | |
635 | tmp_events = new_tmp_events; | |
f20baf8e | 636 | } |
022d91ba | 637 | memcpy(tmp_events + count, agent_events, |
53efb85a | 638 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 639 | free(agent_events); |
f20baf8e DG |
640 | count += nb_ev; |
641 | } | |
642 | rcu_read_unlock(); | |
643 | ||
644 | ret = count; | |
645 | *events = tmp_events; | |
aae6255e | 646 | return ret; |
f20baf8e | 647 | |
428de77a MD |
648 | error_unlock: |
649 | rcu_read_unlock(); | |
f20baf8e | 650 | error: |
aae6255e | 651 | free(tmp_events); |
f20baf8e DG |
652 | return ret; |
653 | } | |
654 | ||
655 | /* | |
022d91ba | 656 | * Create a agent app object using the given PID. |
f20baf8e DG |
657 | * |
658 | * Return newly allocated object or else NULL on error. | |
659 | */ | |
fefd409b DG |
660 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
661 | struct lttcomm_sock *sock) | |
f20baf8e | 662 | { |
022d91ba | 663 | struct agent_app *app; |
f20baf8e DG |
664 | |
665 | assert(sock); | |
666 | ||
667 | app = zmalloc(sizeof(*app)); | |
668 | if (!app) { | |
022d91ba | 669 | PERROR("zmalloc agent create"); |
f20baf8e DG |
670 | goto error; |
671 | } | |
672 | ||
673 | app->pid = pid; | |
fefd409b | 674 | app->domain = domain; |
f20baf8e | 675 | app->sock = sock; |
f20baf8e DG |
676 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
677 | ||
678 | error: | |
679 | return app; | |
680 | } | |
681 | ||
682 | /* | |
022d91ba | 683 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
684 | * |
685 | * RCU read side lock MUST be acquired. | |
686 | * | |
687 | * Return object if found else NULL. | |
688 | */ | |
022d91ba | 689 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
690 | { |
691 | struct lttng_ht_node_ulong *node; | |
692 | struct lttng_ht_iter iter; | |
022d91ba | 693 | struct agent_app *app; |
f20baf8e DG |
694 | |
695 | assert(sock >= 0); | |
696 | ||
022d91ba | 697 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
698 | node = lttng_ht_iter_get_node_ulong(&iter); |
699 | if (node == NULL) { | |
700 | goto error; | |
701 | } | |
022d91ba | 702 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 703 | |
022d91ba | 704 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
705 | return app; |
706 | ||
707 | error: | |
022d91ba | 708 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
709 | return NULL; |
710 | } | |
711 | ||
712 | /* | |
022d91ba | 713 | * Add agent application object to the global hash table. |
f20baf8e | 714 | */ |
022d91ba | 715 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
716 | { |
717 | assert(app); | |
718 | ||
022d91ba | 719 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
022d91ba | 720 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
721 | } |
722 | ||
f20baf8e | 723 | /* |
022d91ba | 724 | * Delete agent application from the global hash table. |
d558f236 JG |
725 | * |
726 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 727 | */ |
022d91ba | 728 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
729 | { |
730 | int ret; | |
731 | struct lttng_ht_iter iter; | |
732 | ||
733 | assert(app); | |
734 | ||
022d91ba | 735 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
736 | |
737 | iter.iter.node = &app->node.node; | |
022d91ba | 738 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
739 | assert(!ret); |
740 | } | |
741 | ||
742 | /* | |
e785906c | 743 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 744 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 745 | * delayed memory reclaim. |
f20baf8e | 746 | */ |
022d91ba | 747 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
748 | { |
749 | assert(app); | |
750 | ||
751 | if (app->sock) { | |
752 | app->sock->ops->close(app->sock); | |
753 | lttcomm_destroy_sock(app->sock); | |
754 | } | |
755 | ||
022d91ba | 756 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
757 | } |
758 | ||
0475c50c | 759 | /* |
022d91ba | 760 | * Initialize an already allocated agent object. |
0475c50c DG |
761 | * |
762 | * Return 0 on success or else a negative errno value. | |
763 | */ | |
022d91ba | 764 | int agent_init(struct agent *agt) |
0475c50c DG |
765 | { |
766 | int ret; | |
767 | ||
022d91ba | 768 | assert(agt); |
0475c50c | 769 | |
022d91ba DG |
770 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
771 | if (!agt->events) { | |
0475c50c DG |
772 | ret = -ENOMEM; |
773 | goto error; | |
774 | } | |
fefd409b | 775 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
776 | |
777 | return 0; | |
778 | ||
779 | error: | |
780 | return ret; | |
781 | } | |
782 | ||
fefd409b DG |
783 | /* |
784 | * Add agent object to the given hash table. | |
785 | */ | |
786 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
787 | { | |
788 | assert(agt); | |
789 | assert(ht); | |
790 | ||
791 | DBG3("Agent adding from domain %d", agt->domain); | |
792 | ||
fefd409b | 793 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
794 | } |
795 | ||
796 | /* | |
797 | * Create an agent object for the given domain. | |
798 | * | |
799 | * Return the allocated agent or NULL on error. | |
800 | */ | |
801 | struct agent *agent_create(enum lttng_domain_type domain) | |
802 | { | |
803 | int ret; | |
804 | struct agent *agt; | |
805 | ||
3b5f70d4 | 806 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
807 | if (!agt) { |
808 | goto error; | |
809 | } | |
810 | agt->domain = domain; | |
811 | ||
812 | ret = agent_init(agt); | |
813 | if (ret < 0) { | |
814 | free(agt); | |
988ae332 | 815 | agt = NULL; |
fefd409b DG |
816 | goto error; |
817 | } | |
818 | ||
819 | error: | |
820 | return agt; | |
821 | } | |
822 | ||
0475c50c | 823 | /* |
51755dc8 JG |
824 | * Create a newly allocated agent event data structure. |
825 | * Ownership of filter_expression is taken. | |
0475c50c DG |
826 | * |
827 | * Return a new object else NULL on error. | |
828 | */ | |
022d91ba | 829 | struct agent_event *agent_create_event(const char *name, |
2106efa0 | 830 | int loglevel_value, enum lttng_loglevel_type loglevel_type, |
51755dc8 | 831 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 832 | { |
51755dc8 | 833 | struct agent_event *event = NULL; |
0475c50c | 834 | |
022d91ba | 835 | DBG3("Agent create new event with name %s", name); |
0475c50c | 836 | |
51755dc8 JG |
837 | if (!name) { |
838 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
839 | goto error; |
840 | } | |
841 | ||
51755dc8 JG |
842 | event = zmalloc(sizeof(*event)); |
843 | if (!event) { | |
844 | goto error; | |
0475c50c DG |
845 | } |
846 | ||
51755dc8 JG |
847 | strncpy(event->name, name, sizeof(event->name)); |
848 | event->name[sizeof(event->name) - 1] = '\0'; | |
849 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 850 | |
2106efa0 | 851 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
852 | event->loglevel_type = loglevel_type; |
853 | event->filter = filter; | |
854 | event->filter_expression = filter_expression; | |
0475c50c DG |
855 | error: |
856 | return event; | |
857 | } | |
858 | ||
859 | /* | |
022d91ba | 860 | * Unique add of a agent event to an agent object. |
0475c50c | 861 | */ |
022d91ba | 862 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
863 | { |
864 | assert(event); | |
022d91ba DG |
865 | assert(agt); |
866 | assert(agt->events); | |
0475c50c | 867 | |
022d91ba | 868 | DBG3("Agent adding event %s", event->name); |
022d91ba | 869 | add_unique_agent_event(agt->events, event); |
022d91ba | 870 | agt->being_used = 1; |
0475c50c DG |
871 | } |
872 | ||
873 | /* | |
022d91ba | 874 | * Find a agent event in the given agent using name. |
4a4ab2c3 DG |
875 | * |
876 | * RCU read side lock MUST be acquired. | |
877 | * | |
878 | * Return object if found else NULL. | |
879 | */ | |
022d91ba DG |
880 | struct agent_event *agent_find_event_by_name(const char *name, |
881 | struct agent *agt) | |
4a4ab2c3 DG |
882 | { |
883 | struct lttng_ht_node_str *node; | |
884 | struct lttng_ht_iter iter; | |
885 | struct lttng_ht *ht; | |
022d91ba | 886 | struct agent_ht_key key; |
4a4ab2c3 DG |
887 | |
888 | assert(name); | |
022d91ba DG |
889 | assert(agt); |
890 | assert(agt->events); | |
4a4ab2c3 | 891 | |
022d91ba | 892 | ht = agt->events; |
4a4ab2c3 DG |
893 | key.name = name; |
894 | ||
895 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
896 | ht_match_event_by_name, &key, &iter.iter); | |
897 | node = lttng_ht_iter_get_node_str(&iter); | |
898 | if (node == NULL) { | |
899 | goto error; | |
900 | } | |
901 | ||
022d91ba DG |
902 | DBG3("Agent event found %s by name.", name); |
903 | return caa_container_of(node, struct agent_event, node); | |
4a4ab2c3 DG |
904 | |
905 | error: | |
022d91ba | 906 | DBG3("Agent NOT found by name %s.", name); |
4a4ab2c3 DG |
907 | return NULL; |
908 | } | |
909 | ||
910 | /* | |
022d91ba | 911 | * Find a agent event in the given agent using name and loglevel. |
0475c50c DG |
912 | * |
913 | * RCU read side lock MUST be acquired. | |
914 | * | |
915 | * Return object if found else NULL. | |
916 | */ | |
2106efa0 | 917 | struct agent_event *agent_find_event(const char *name, int loglevel_value, |
022d91ba | 918 | struct agent *agt) |
0475c50c DG |
919 | { |
920 | struct lttng_ht_node_str *node; | |
921 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 922 | struct lttng_ht *ht; |
022d91ba | 923 | struct agent_ht_key key; |
0475c50c DG |
924 | |
925 | assert(name); | |
022d91ba DG |
926 | assert(agt); |
927 | assert(agt->events); | |
0475c50c | 928 | |
022d91ba | 929 | ht = agt->events; |
4a4ab2c3 | 930 | key.name = name; |
2106efa0 | 931 | key.loglevel_value = loglevel_value; |
4a4ab2c3 DG |
932 | |
933 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
934 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
935 | node = lttng_ht_iter_get_node_str(&iter); |
936 | if (node == NULL) { | |
937 | goto error; | |
938 | } | |
939 | ||
022d91ba DG |
940 | DBG3("Agent event found %s.", name); |
941 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
942 | |
943 | error: | |
a51e817b | 944 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
945 | return NULL; |
946 | } | |
947 | ||
0475c50c | 948 | /* |
022d91ba DG |
949 | * Free given agent event. This event must not be globally visible at this |
950 | * point (only expected to be used on failure just after event creation). After | |
951 | * this call, the pointer is not usable anymore. | |
0475c50c | 952 | */ |
022d91ba | 953 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
954 | { |
955 | assert(event); | |
956 | ||
971da06a | 957 | free(event->filter); |
8404118c | 958 | free(event->filter_expression); |
51755dc8 | 959 | free(event->exclusion); |
0475c50c DG |
960 | free(event); |
961 | } | |
962 | ||
963 | /* | |
35ed21a5 | 964 | * Destroy an agent completely. |
0475c50c | 965 | */ |
022d91ba | 966 | void agent_destroy(struct agent *agt) |
0475c50c DG |
967 | { |
968 | struct lttng_ht_node_str *node; | |
969 | struct lttng_ht_iter iter; | |
970 | ||
022d91ba | 971 | assert(agt); |
0475c50c | 972 | |
022d91ba | 973 | DBG3("Agent destroy"); |
0475c50c | 974 | |
0475c50c | 975 | rcu_read_lock(); |
022d91ba | 976 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 977 | int ret; |
022d91ba | 978 | struct agent_event *event; |
29c0fd4d DG |
979 | |
980 | /* | |
981 | * When destroying an event, we have to try to disable it on the agent | |
982 | * side so the event stops generating data. The return value is not | |
983 | * important since we have to continue anyway destroying the object. | |
984 | */ | |
022d91ba DG |
985 | event = caa_container_of(node, struct agent_event, node); |
986 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 987 | |
022d91ba | 988 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 989 | assert(!ret); |
022d91ba | 990 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
991 | } |
992 | rcu_read_unlock(); | |
993 | ||
f8be902b | 994 | ht_cleanup_push(agt->events); |
35ed21a5 | 995 | free(agt); |
f20baf8e DG |
996 | } |
997 | ||
998 | /* | |
6a4e4039 | 999 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1000 | */ |
6a4e4039 | 1001 | int agent_app_ht_alloc(void) |
f20baf8e | 1002 | { |
6a4e4039 JG |
1003 | int ret = 0; |
1004 | ||
022d91ba DG |
1005 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1006 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1007 | ret = -1; |
f20baf8e DG |
1008 | } |
1009 | ||
6a4e4039 JG |
1010 | return ret; |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * Destroy a agent application by socket. | |
1015 | */ | |
1016 | void agent_destroy_app_by_sock(int sock) | |
1017 | { | |
1018 | struct agent_app *app; | |
1019 | ||
1020 | assert(sock >= 0); | |
1021 | ||
1022 | /* | |
1023 | * Not finding an application is a very important error that should NEVER | |
1024 | * happen. The hash table deletion is ONLY done through this call when the | |
1025 | * main sessiond thread is torn down. | |
1026 | */ | |
1027 | rcu_read_lock(); | |
1028 | app = agent_find_app_by_sock(sock); | |
1029 | assert(app); | |
1030 | ||
1031 | /* RCU read side lock is assumed to be held by this function. */ | |
1032 | agent_delete_app(app); | |
1033 | ||
1034 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1035 | agent_destroy_app(app); | |
1036 | rcu_read_unlock(); | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Clean-up the agent app hash table and destroy it. | |
1041 | */ | |
1042 | void agent_app_ht_clean(void) | |
1043 | { | |
1044 | struct lttng_ht_node_ulong *node; | |
1045 | struct lttng_ht_iter iter; | |
1046 | ||
a433283e JG |
1047 | if (!agent_apps_ht_by_sock) { |
1048 | return; | |
1049 | } | |
6a4e4039 JG |
1050 | rcu_read_lock(); |
1051 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1052 | struct agent_app *app; | |
1053 | ||
1054 | app = caa_container_of(node, struct agent_app, node); | |
1055 | agent_destroy_app_by_sock(app->sock->fd); | |
1056 | } | |
1057 | rcu_read_unlock(); | |
1058 | ||
1059 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1060 | } |
1061 | ||
1062 | /* | |
022d91ba | 1063 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1064 | * |
1065 | * Note that this function is most likely to be used with a tracing session | |
1066 | * thus the caller should make sure to hold the appropriate lock(s). | |
1067 | */ | |
022d91ba | 1068 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1069 | { |
1070 | int ret; | |
022d91ba DG |
1071 | struct agent_app *app; |
1072 | struct agent_event *event; | |
f20baf8e DG |
1073 | struct lttng_ht_iter iter; |
1074 | ||
022d91ba | 1075 | assert(agt); |
f20baf8e DG |
1076 | assert(sock >= 0); |
1077 | ||
022d91ba | 1078 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1079 | |
1080 | rcu_read_lock(); | |
022d91ba | 1081 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1082 | /* Skip event if disabled. */ |
1083 | if (!event->enabled) { | |
1084 | continue; | |
1085 | } | |
1086 | ||
022d91ba | 1087 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1088 | /* |
1089 | * We are in the registration path thus if the application is gone, | |
1090 | * there is a serious code flow error. | |
1091 | */ | |
1092 | assert(app); | |
1093 | ||
1094 | ret = enable_event(app, event); | |
1095 | if (ret != LTTNG_OK) { | |
022d91ba | 1096 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1097 | event->name, app->pid, app->sock->fd); |
1098 | /* Let's try the others here and don't assume the app is dead. */ | |
1099 | continue; | |
1100 | } | |
1101 | } | |
1102 | rcu_read_unlock(); | |
0475c50c | 1103 | } |