Commit | Line | Data |
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0475c50c DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
0475c50c DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
0475c50c | 20 | #include <assert.h> |
f20baf8e | 21 | #include <urcu/uatomic.h> |
bdf64013 | 22 | #include <urcu/rculist.h> |
0475c50c DG |
23 | |
24 | #include <common/common.h> | |
022d91ba | 25 | #include <common/sessiond-comm/agent.h> |
0475c50c | 26 | |
f263b7fd JD |
27 | #include <common/compat/endian.h> |
28 | ||
022d91ba | 29 | #include "agent.h" |
f20baf8e | 30 | #include "ust-app.h" |
0475c50c | 31 | #include "utils.h" |
23c2bd47 JG |
32 | #include "error.h" |
33 | ||
34 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) | |
35 | ||
bdf64013 JG |
36 | /* |
37 | * Agent application context representation. | |
38 | */ | |
39 | struct agent_app_ctx { | |
40 | char *provider_name; | |
41 | char *ctx_name; | |
42 | ||
43 | /* agent_app_ctx are part of the agent app_ctx_list. */ | |
44 | struct cds_list_head list_node; | |
45 | ||
46 | /* For call_rcu teardown. */ | |
47 | struct rcu_head rcu_node; | |
48 | }; | |
49 | ||
23c2bd47 JG |
50 | /* |
51 | * Human readable agent return code. | |
52 | */ | |
53 | static const char *error_string_array[] = { | |
54 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
55 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
56 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
57 | ||
58 | /* Last element */ | |
59 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
60 | }; | |
61 | ||
62 | static | |
63 | void log_reply_code(uint32_t in_reply_ret_code) | |
64 | { | |
65 | int level = PRINT_DBG3; | |
66 | /* | |
67 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
68 | * sanitized value (used to retrieve the human readable string) and the | |
69 | * original value which is logged as-is. | |
70 | */ | |
71 | uint32_t reply_ret_code = in_reply_ret_code; | |
72 | ||
73 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
74 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
75 | reply_ret_code = AGENT_RET_CODE_NR; | |
76 | level = PRINT_ERR; | |
77 | } | |
78 | ||
79 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
80 | error_string_array[AGENT_RET_CODE_INDEX( | |
81 | reply_ret_code)], | |
82 | in_reply_ret_code); | |
83 | } | |
0475c50c | 84 | |
4a4ab2c3 DG |
85 | /* |
86 | * Match function for the events hash table lookup by name. | |
87 | */ | |
88 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
89 | const void *_key) | |
90 | { | |
022d91ba DG |
91 | struct agent_event *event; |
92 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
93 | |
94 | assert(node); | |
95 | assert(_key); | |
96 | ||
022d91ba | 97 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
98 | key = _key; |
99 | ||
100 | /* Match 1 elements of the key: name. */ | |
101 | ||
102 | /* Event name */ | |
103 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
104 | goto no_match; | |
105 | } | |
106 | /* Match. */ | |
107 | return 1; | |
108 | ||
109 | no_match: | |
110 | return 0; | |
111 | } | |
112 | ||
113 | /* | |
114 | * Match function for the events hash table lookup by name and loglevel. | |
115 | */ | |
116 | static int ht_match_event(struct cds_lfht_node *node, | |
117 | const void *_key) | |
118 | { | |
022d91ba DG |
119 | struct agent_event *event; |
120 | const struct agent_ht_key *key; | |
19a97244 | 121 | int ll_match; |
4a4ab2c3 DG |
122 | |
123 | assert(node); | |
124 | assert(_key); | |
125 | ||
022d91ba | 126 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
127 | key = _key; |
128 | ||
129 | /* Match 2 elements of the key: name and loglevel. */ | |
130 | ||
131 | /* Event name */ | |
132 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
133 | goto no_match; | |
134 | } | |
135 | ||
a9319624 | 136 | /* Event loglevel value and type. */ |
19a97244 PP |
137 | ll_match = loglevels_match(event->loglevel_type, |
138 | event->loglevel_value, key->loglevel_type, | |
139 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
140 | ||
141 | if (!ll_match) { | |
4a4ab2c3 DG |
142 | goto no_match; |
143 | } | |
a9319624 | 144 | |
6b10b3b0 AM |
145 | /* Filter expression */ |
146 | if (strncmp(event->filter_expression, key->filter_expression, | |
147 | strlen(event->filter_expression)) != 0) { | |
148 | goto no_match; | |
149 | } | |
150 | ||
4a4ab2c3 DG |
151 | return 1; |
152 | ||
153 | no_match: | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* | |
022d91ba | 158 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 159 | */ |
022d91ba DG |
160 | static void add_unique_agent_event(struct lttng_ht *ht, |
161 | struct agent_event *event) | |
4a4ab2c3 DG |
162 | { |
163 | struct cds_lfht_node *node_ptr; | |
022d91ba | 164 | struct agent_ht_key key; |
4a4ab2c3 DG |
165 | |
166 | assert(ht); | |
167 | assert(ht->ht); | |
168 | assert(event); | |
169 | ||
170 | key.name = event->name; | |
2106efa0 | 171 | key.loglevel_value = event->loglevel_value; |
a9319624 | 172 | key.loglevel_type = event->loglevel_type; |
6b10b3b0 | 173 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
174 | |
175 | node_ptr = cds_lfht_add_unique(ht->ht, | |
176 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
177 | ht_match_event, &key, &event->node.node); | |
178 | assert(node_ptr == &event->node.node); | |
179 | } | |
180 | ||
0475c50c | 181 | /* |
022d91ba | 182 | * URCU delayed agent event reclaim. |
0475c50c | 183 | */ |
022d91ba | 184 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
185 | { |
186 | struct lttng_ht_node_str *node = | |
187 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
188 | struct agent_event *event = |
189 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 190 | |
992febc7 | 191 | agent_destroy_event(event); |
0475c50c DG |
192 | } |
193 | ||
f20baf8e | 194 | /* |
022d91ba | 195 | * URCU delayed agent app reclaim. |
f20baf8e | 196 | */ |
022d91ba | 197 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
198 | { |
199 | struct lttng_ht_node_ulong *node = | |
200 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
201 | struct agent_app *app = |
202 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
203 | |
204 | free(app); | |
205 | } | |
206 | ||
207 | /* | |
022d91ba DG |
208 | * Communication with the agent. Send the message header to the given socket in |
209 | * big endian. | |
f20baf8e DG |
210 | * |
211 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
212 | */ | |
213 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
214 | uint32_t cmd, uint32_t cmd_version) | |
215 | { | |
216 | int ret; | |
217 | ssize_t size; | |
022d91ba | 218 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
219 | |
220 | assert(sock); | |
221 | ||
53efb85a | 222 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
223 | msg.data_size = htobe64(data_size); |
224 | msg.cmd = htobe32(cmd); | |
225 | msg.cmd_version = htobe32(cmd_version); | |
226 | ||
227 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
228 | if (size < sizeof(msg)) { | |
229 | ret = -errno; | |
230 | goto error; | |
231 | } | |
232 | ret = 0; | |
233 | ||
234 | error: | |
235 | return ret; | |
236 | } | |
237 | ||
238 | /* | |
022d91ba DG |
239 | * Communication call with the agent. Send the payload to the given socket. The |
240 | * header MUST be sent prior to this call. | |
f20baf8e DG |
241 | * |
242 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
243 | */ | |
bdf64013 | 244 | static int send_payload(struct lttcomm_sock *sock, const void *data, |
f20baf8e DG |
245 | size_t size) |
246 | { | |
247 | int ret; | |
248 | ssize_t len; | |
249 | ||
250 | assert(sock); | |
251 | assert(data); | |
252 | ||
253 | len = sock->ops->sendmsg(sock, data, size, 0); | |
254 | if (len < size) { | |
255 | ret = -errno; | |
256 | goto error; | |
257 | } | |
258 | ret = 0; | |
259 | ||
260 | error: | |
261 | return ret; | |
262 | } | |
263 | ||
264 | /* | |
022d91ba DG |
265 | * Communication call with the agent. Receive reply from the agent using the |
266 | * given socket. | |
f20baf8e DG |
267 | * |
268 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
269 | */ | |
270 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
271 | { | |
272 | int ret; | |
273 | ssize_t len; | |
274 | ||
275 | assert(sock); | |
276 | assert(buf); | |
277 | ||
278 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
279 | if (len < size) { | |
280 | ret = -errno; | |
281 | goto error; | |
282 | } | |
283 | ret = 0; | |
284 | ||
285 | error: | |
286 | return ret; | |
287 | } | |
288 | ||
3c6a091f | 289 | /* |
428de77a | 290 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
291 | * |
292 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
293 | * On success, the caller is responsible for freeing the memory |
294 | * allocated for "events". | |
3c6a091f | 295 | */ |
022d91ba | 296 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
297 | { |
298 | int ret, i, len = 0, offset = 0; | |
299 | uint32_t nb_event; | |
300 | size_t data_size; | |
d84af1a4 | 301 | uint32_t reply_ret_code; |
3c6a091f | 302 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
303 | struct lttcomm_agent_list_reply *reply = NULL; |
304 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
305 | |
306 | assert(app); | |
307 | assert(app->sock); | |
308 | assert(events); | |
309 | ||
022d91ba | 310 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
311 | app->sock->fd); |
312 | ||
022d91ba | 313 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
314 | if (ret < 0) { |
315 | goto error_io; | |
316 | } | |
317 | ||
318 | /* Get list header so we know how much we'll receive. */ | |
319 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
320 | if (ret < 0) { | |
321 | goto error_io; | |
322 | } | |
323 | ||
d84af1a4 JG |
324 | reply_ret_code = be32toh(reply_hdr.ret_code); |
325 | log_reply_code(reply_ret_code); | |
326 | switch (reply_ret_code) { | |
022d91ba | 327 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
328 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
329 | break; | |
330 | default: | |
3bd9aaeb | 331 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
332 | goto error; |
333 | } | |
334 | ||
335 | reply = zmalloc(data_size); | |
336 | if (!reply) { | |
337 | ret = LTTNG_ERR_NOMEM; | |
338 | goto error; | |
339 | } | |
340 | ||
341 | /* Get the list with the appropriate data size. */ | |
342 | ret = recv_reply(app->sock, reply, data_size); | |
343 | if (ret < 0) { | |
344 | goto error_io; | |
345 | } | |
346 | ||
347 | nb_event = be32toh(reply->nb_event); | |
348 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
349 | if (!tmp_events) { | |
350 | ret = LTTNG_ERR_NOMEM; | |
351 | goto error; | |
352 | } | |
353 | ||
354 | for (i = 0; i < nb_event; i++) { | |
355 | offset += len; | |
0a85e7a3 MD |
356 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
357 | sizeof(tmp_events[i].name))) { | |
358 | ret = LTTNG_ERR_INVALID; | |
359 | goto error; | |
360 | } | |
3c6a091f DG |
361 | tmp_events[i].pid = app->pid; |
362 | tmp_events[i].enabled = -1; | |
363 | len = strlen(reply->payload + offset) + 1; | |
364 | } | |
365 | ||
366 | *events = tmp_events; | |
367 | ||
368 | free(reply); | |
369 | return nb_event; | |
370 | ||
371 | error_io: | |
372 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
373 | error: | |
374 | free(reply); | |
375 | free(tmp_events); | |
376 | return -ret; | |
377 | ||
378 | } | |
379 | ||
f20baf8e | 380 | /* |
022d91ba DG |
381 | * Internal enable agent event on a agent application. This function |
382 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
383 | * |
384 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
385 | */ | |
022d91ba | 386 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
387 | { |
388 | int ret; | |
a0ba721c | 389 | char *bytes_to_send; |
f20baf8e | 390 | uint64_t data_size; |
a0ba721c | 391 | size_t filter_expression_length; |
f4f9d4db | 392 | uint32_t reply_ret_code; |
bdf64013 | 393 | struct lttcomm_agent_enable_event msg; |
022d91ba | 394 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
395 | |
396 | assert(app); | |
397 | assert(app->sock); | |
398 | assert(event); | |
399 | ||
022d91ba | 400 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
401 | app->pid, app->sock->fd); |
402 | ||
a0ba721c AM |
403 | /* |
404 | * Calculate the payload's size, which is the fixed-size struct followed | |
405 | * by the variable-length filter expression (+1 for the ending \0). | |
406 | */ | |
407 | if (!event->filter_expression) { | |
408 | filter_expression_length = 0; | |
409 | } else { | |
410 | filter_expression_length = strlen(event->filter_expression) + 1; | |
411 | } | |
412 | data_size = sizeof(msg) + filter_expression_length; | |
f20baf8e | 413 | |
53efb85a | 414 | memset(&msg, 0, sizeof(msg)); |
a9bfd666 JG |
415 | msg.loglevel_value = htobe32(event->loglevel_value); |
416 | msg.loglevel_type = htobe32(event->loglevel_type); | |
bb45c03e MD |
417 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { |
418 | ret = LTTNG_ERR_INVALID; | |
419 | goto error; | |
420 | } | |
a9bfd666 | 421 | msg.filter_expression_length = htobe32(filter_expression_length); |
a0ba721c | 422 | |
bb45c03e MD |
423 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
424 | if (ret < 0) { | |
425 | goto error_io; | |
426 | } | |
427 | ||
a0ba721c AM |
428 | bytes_to_send = zmalloc(data_size); |
429 | if (!bytes_to_send) { | |
430 | ret = LTTNG_ERR_NOMEM; | |
431 | goto error; | |
432 | } | |
433 | ||
434 | memcpy(bytes_to_send, &msg, sizeof(msg)); | |
435 | if (filter_expression_length > 0) { | |
436 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, | |
437 | filter_expression_length); | |
438 | } | |
439 | ||
440 | ret = send_payload(app->sock, bytes_to_send, data_size); | |
441 | free(bytes_to_send); | |
f20baf8e DG |
442 | if (ret < 0) { |
443 | goto error_io; | |
444 | } | |
445 | ||
446 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
447 | if (ret < 0) { | |
448 | goto error_io; | |
449 | } | |
450 | ||
f4f9d4db JG |
451 | reply_ret_code = be32toh(reply.ret_code); |
452 | log_reply_code(reply_ret_code); | |
453 | switch (reply_ret_code) { | |
022d91ba | 454 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 455 | break; |
022d91ba | 456 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
457 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
458 | goto error; | |
459 | default: | |
3bd9aaeb | 460 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
461 | goto error; |
462 | } | |
463 | ||
464 | return LTTNG_OK; | |
465 | ||
466 | error_io: | |
467 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
468 | error: | |
469 | return ret; | |
470 | } | |
471 | ||
bdf64013 JG |
472 | /* |
473 | * Send Pascal-style string. Size is sent as a 32-bit big endian integer. | |
474 | */ | |
475 | static | |
476 | int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len) | |
477 | { | |
478 | int ret; | |
479 | uint32_t len_be; | |
480 | ||
481 | len_be = htobe32(len); | |
482 | ret = send_payload(sock, &len_be, sizeof(len_be)); | |
483 | if (ret) { | |
484 | goto end; | |
485 | } | |
486 | ||
487 | ret = send_payload(sock, str, len); | |
488 | if (ret) { | |
489 | goto end; | |
490 | } | |
491 | end: | |
492 | return ret; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Internal enable application context on an agent application. This function | |
497 | * communicates with the agent to enable a given application context. | |
498 | * | |
499 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
500 | */ | |
501 | static int app_context_op(struct agent_app *app, | |
502 | struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd) | |
503 | { | |
504 | int ret; | |
505 | uint32_t reply_ret_code; | |
506 | struct lttcomm_agent_generic_reply reply; | |
507 | size_t app_ctx_provider_name_len, app_ctx_name_len, data_size; | |
508 | ||
509 | assert(app); | |
510 | assert(app->sock); | |
511 | assert(ctx); | |
512 | assert(cmd == AGENT_CMD_APP_CTX_ENABLE || | |
513 | cmd == AGENT_CMD_APP_CTX_DISABLE); | |
514 | ||
515 | DBG2("Agent %s application %s:%s for app pid: %d and socket %d", | |
516 | cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling", | |
517 | ctx->provider_name, ctx->ctx_name, | |
518 | app->pid, app->sock->fd); | |
519 | ||
520 | /* | |
521 | * Calculate the payload's size, which consists of the size (u32, BE) | |
522 | * of the provider name, the NULL-terminated provider name string, the | |
523 | * size (u32, BE) of the context name, followed by the NULL-terminated | |
524 | * context name string. | |
525 | */ | |
526 | app_ctx_provider_name_len = strlen(ctx->provider_name) + 1; | |
527 | app_ctx_name_len = strlen(ctx->ctx_name) + 1; | |
528 | data_size = sizeof(uint32_t) + app_ctx_provider_name_len + | |
529 | sizeof(uint32_t) + app_ctx_name_len; | |
530 | ||
531 | ret = send_header(app->sock, data_size, cmd, 0); | |
532 | if (ret < 0) { | |
533 | goto error_io; | |
534 | } | |
535 | ||
536 | if (app_ctx_provider_name_len > UINT32_MAX || | |
537 | app_ctx_name_len > UINT32_MAX) { | |
538 | ERR("Application context name > MAX_UINT32"); | |
539 | ret = LTTNG_ERR_INVALID; | |
540 | goto error; | |
541 | } | |
542 | ||
543 | ret = send_pstring(app->sock, ctx->provider_name, | |
544 | (uint32_t) app_ctx_provider_name_len); | |
545 | if (ret < 0) { | |
546 | goto error_io; | |
547 | } | |
548 | ||
549 | ret = send_pstring(app->sock, ctx->ctx_name, | |
550 | (uint32_t) app_ctx_name_len); | |
551 | if (ret < 0) { | |
552 | goto error_io; | |
553 | } | |
554 | ||
555 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
556 | if (ret < 0) { | |
557 | goto error_io; | |
558 | } | |
559 | ||
560 | reply_ret_code = be32toh(reply.ret_code); | |
561 | log_reply_code(reply_ret_code); | |
562 | switch (reply_ret_code) { | |
563 | case AGENT_RET_CODE_SUCCESS: | |
564 | break; | |
565 | default: | |
566 | ret = LTTNG_ERR_UNK; | |
567 | goto error; | |
568 | } | |
569 | ||
570 | return LTTNG_OK; | |
571 | ||
572 | error_io: | |
573 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
574 | error: | |
575 | return ret; | |
576 | } | |
577 | ||
f20baf8e | 578 | /* |
022d91ba DG |
579 | * Internal disable agent event call on a agent application. This function |
580 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
581 | * |
582 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
583 | */ | |
022d91ba | 584 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
585 | { |
586 | int ret; | |
587 | uint64_t data_size; | |
517992f8 | 588 | uint32_t reply_ret_code; |
bdf64013 | 589 | struct lttcomm_agent_disable_event msg; |
022d91ba | 590 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
591 | |
592 | assert(app); | |
593 | assert(app->sock); | |
594 | assert(event); | |
595 | ||
022d91ba | 596 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
597 | app->pid, app->sock->fd); |
598 | ||
599 | data_size = sizeof(msg); | |
63be730a MD |
600 | memset(&msg, 0, sizeof(msg)); |
601 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
602 | ret = LTTNG_ERR_INVALID; | |
603 | goto error; | |
604 | } | |
f20baf8e | 605 | |
022d91ba | 606 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
607 | if (ret < 0) { |
608 | goto error_io; | |
609 | } | |
610 | ||
f20baf8e DG |
611 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
612 | if (ret < 0) { | |
613 | goto error_io; | |
614 | } | |
615 | ||
616 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
617 | if (ret < 0) { | |
618 | goto error_io; | |
619 | } | |
620 | ||
517992f8 JG |
621 | reply_ret_code = be32toh(reply.ret_code); |
622 | log_reply_code(reply_ret_code); | |
623 | switch (reply_ret_code) { | |
022d91ba DG |
624 | case AGENT_RET_CODE_SUCCESS: |
625 | break; | |
626 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
627 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
628 | goto error; | |
629 | default: | |
3bd9aaeb | 630 | ret = LTTNG_ERR_UNK; |
022d91ba | 631 | goto error; |
f20baf8e DG |
632 | } |
633 | ||
634 | return LTTNG_OK; | |
635 | ||
636 | error_io: | |
637 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
638 | error: | |
639 | return ret; | |
640 | } | |
641 | ||
1b500e7a | 642 | /* |
022d91ba | 643 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
644 | * |
645 | * Return 0 on success or else a negative value. | |
646 | */ | |
022d91ba | 647 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
648 | { |
649 | assert(app); | |
650 | assert(app->sock); | |
651 | ||
022d91ba | 652 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 653 | |
b26d1f5c | 654 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
655 | } |
656 | ||
f20baf8e | 657 | /* |
022d91ba | 658 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
659 | * daemon. |
660 | * | |
661 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
662 | */ | |
fefd409b DG |
663 | int agent_enable_event(struct agent_event *event, |
664 | enum lttng_domain_type domain) | |
f20baf8e DG |
665 | { |
666 | int ret; | |
022d91ba | 667 | struct agent_app *app; |
f20baf8e DG |
668 | struct lttng_ht_iter iter; |
669 | ||
670 | assert(event); | |
671 | ||
672 | rcu_read_lock(); | |
673 | ||
022d91ba | 674 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 675 | node.node) { |
fefd409b DG |
676 | if (app->domain != domain) { |
677 | continue; | |
678 | } | |
679 | ||
022d91ba | 680 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
681 | ret = enable_event(app, event); |
682 | if (ret != LTTNG_OK) { | |
683 | goto error; | |
684 | } | |
f20baf8e DG |
685 | } |
686 | ||
3c6a091f | 687 | event->enabled = 1; |
f20baf8e DG |
688 | ret = LTTNG_OK; |
689 | ||
690 | error: | |
691 | rcu_read_unlock(); | |
692 | return ret; | |
693 | } | |
694 | ||
bdf64013 JG |
695 | static |
696 | void destroy_app_ctx(struct agent_app_ctx *ctx) | |
697 | { | |
698 | free(ctx->provider_name); | |
699 | free(ctx->ctx_name); | |
700 | free(ctx); | |
701 | } | |
702 | ||
703 | static | |
704 | struct agent_app_ctx *create_app_ctx(struct lttng_event_context *ctx) | |
705 | { | |
706 | struct agent_app_ctx *agent_ctx = NULL; | |
707 | ||
708 | if (!ctx) { | |
709 | goto end; | |
710 | } | |
711 | ||
712 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
713 | agent_ctx = zmalloc(sizeof(*ctx)); | |
714 | if (!agent_ctx) { | |
715 | goto end; | |
716 | } | |
717 | ||
718 | agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name); | |
719 | agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name); | |
720 | if (!agent_ctx->provider_name || !agent_ctx->ctx_name) { | |
721 | destroy_app_ctx(agent_ctx); | |
722 | agent_ctx = NULL; | |
723 | } | |
724 | end: | |
725 | return agent_ctx; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Enable agent context on every agent applications registered with the session | |
730 | * daemon. | |
731 | * | |
732 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
733 | */ | |
734 | int agent_enable_context(struct lttng_event_context *ctx, | |
735 | enum lttng_domain_type domain) | |
736 | { | |
737 | int ret; | |
738 | struct agent_app *app; | |
739 | struct lttng_ht_iter iter; | |
740 | ||
741 | assert(ctx); | |
742 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
743 | ret = LTTNG_ERR_INVALID; | |
744 | goto error; | |
745 | } | |
746 | ||
747 | rcu_read_lock(); | |
748 | ||
749 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, | |
750 | node.node) { | |
751 | struct agent_app_ctx *agent_ctx; | |
752 | ||
753 | if (app->domain != domain) { | |
754 | continue; | |
755 | } | |
756 | ||
757 | agent_ctx = create_app_ctx(ctx); | |
758 | if (!agent_ctx) { | |
a33c2651 | 759 | ret = LTTNG_ERR_NOMEM; |
bdf64013 JG |
760 | goto error_unlock; |
761 | } | |
762 | ||
763 | /* Enable event on agent application through TCP socket. */ | |
764 | ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); | |
c12618b5 | 765 | destroy_app_ctx(agent_ctx); |
bdf64013 | 766 | if (ret != LTTNG_OK) { |
bdf64013 JG |
767 | goto error_unlock; |
768 | } | |
769 | } | |
770 | ||
771 | ret = LTTNG_OK; | |
772 | ||
773 | error_unlock: | |
774 | rcu_read_unlock(); | |
775 | error: | |
776 | return ret; | |
777 | } | |
778 | ||
f20baf8e | 779 | /* |
bdf64013 | 780 | * Disable agent event on every agent application registered with the session |
f20baf8e DG |
781 | * daemon. |
782 | * | |
783 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
784 | */ | |
fefd409b DG |
785 | int agent_disable_event(struct agent_event *event, |
786 | enum lttng_domain_type domain) | |
f20baf8e | 787 | { |
f1bc0129 | 788 | int ret = LTTNG_OK; |
022d91ba | 789 | struct agent_app *app; |
f20baf8e DG |
790 | struct lttng_ht_iter iter; |
791 | ||
792 | assert(event); | |
f1bc0129 JG |
793 | if (!event->enabled) { |
794 | goto end; | |
795 | } | |
f20baf8e DG |
796 | |
797 | rcu_read_lock(); | |
798 | ||
022d91ba | 799 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 800 | node.node) { |
fefd409b DG |
801 | if (app->domain != domain) { |
802 | continue; | |
803 | } | |
804 | ||
022d91ba | 805 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
806 | ret = disable_event(app, event); |
807 | if (ret != LTTNG_OK) { | |
808 | goto error; | |
809 | } | |
f20baf8e DG |
810 | } |
811 | ||
3c6a091f | 812 | event->enabled = 0; |
f20baf8e DG |
813 | |
814 | error: | |
815 | rcu_read_unlock(); | |
f1bc0129 | 816 | end: |
f20baf8e DG |
817 | return ret; |
818 | } | |
819 | ||
bdf64013 JG |
820 | /* |
821 | * Disable agent context on every agent application registered with the session | |
822 | * daemon. | |
823 | * | |
824 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
825 | */ | |
826 | int disable_context(struct agent_app_ctx *ctx, enum lttng_domain_type domain) | |
827 | { | |
828 | int ret = LTTNG_OK; | |
829 | struct agent_app *app; | |
830 | struct lttng_ht_iter iter; | |
831 | ||
832 | assert(ctx); | |
833 | ||
834 | rcu_read_lock(); | |
835 | DBG2("Disabling agent application context %s:%s", | |
836 | ctx->provider_name, ctx->ctx_name); | |
837 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, | |
838 | node.node) { | |
839 | if (app->domain != domain) { | |
840 | continue; | |
841 | } | |
842 | ||
843 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); | |
844 | if (ret != LTTNG_OK) { | |
845 | goto end; | |
846 | } | |
847 | } | |
848 | end: | |
849 | rcu_read_unlock(); | |
850 | return ret; | |
851 | } | |
852 | ||
f20baf8e | 853 | /* |
022d91ba DG |
854 | * Ask every agent for the list of possible event. Events is allocated with the |
855 | * events of every agent application. | |
f20baf8e DG |
856 | * |
857 | * Return the number of events or else a negative value. | |
858 | */ | |
f60140a1 DG |
859 | int agent_list_events(struct lttng_event **events, |
860 | enum lttng_domain_type domain) | |
f20baf8e DG |
861 | { |
862 | int ret; | |
863 | size_t nbmem, count = 0; | |
022d91ba | 864 | struct agent_app *app; |
aae6255e | 865 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
866 | struct lttng_ht_iter iter; |
867 | ||
868 | assert(events); | |
869 | ||
0e115563 DG |
870 | DBG2("Agent listing events for domain %d", domain); |
871 | ||
f20baf8e DG |
872 | nbmem = UST_APP_EVENT_LIST_SIZE; |
873 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
874 | if (!tmp_events) { | |
022d91ba | 875 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
876 | ret = -ENOMEM; |
877 | goto error; | |
878 | } | |
879 | ||
880 | rcu_read_lock(); | |
022d91ba | 881 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
882 | node.node) { |
883 | ssize_t nb_ev; | |
022d91ba | 884 | struct lttng_event *agent_events; |
f20baf8e | 885 | |
f60140a1 DG |
886 | /* Skip domain not asked by the list. */ |
887 | if (app->domain != domain) { | |
888 | continue; | |
889 | } | |
890 | ||
022d91ba | 891 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
892 | if (nb_ev < 0) { |
893 | ret = nb_ev; | |
428de77a | 894 | goto error_unlock; |
f20baf8e DG |
895 | } |
896 | ||
53efb85a | 897 | if (count + nb_ev > nbmem) { |
f20baf8e | 898 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
899 | struct lttng_event *new_tmp_events; |
900 | size_t new_nbmem; | |
901 | ||
902 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 903 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
904 | nbmem, new_nbmem); |
905 | new_tmp_events = realloc(tmp_events, | |
906 | new_nbmem * sizeof(*new_tmp_events)); | |
907 | if (!new_tmp_events) { | |
022d91ba | 908 | PERROR("realloc agent events"); |
f20baf8e | 909 | ret = -ENOMEM; |
022d91ba | 910 | free(agent_events); |
428de77a | 911 | goto error_unlock; |
f20baf8e | 912 | } |
53efb85a MD |
913 | /* Zero the new memory */ |
914 | memset(new_tmp_events + nbmem, 0, | |
915 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
916 | nbmem = new_nbmem; | |
917 | tmp_events = new_tmp_events; | |
f20baf8e | 918 | } |
022d91ba | 919 | memcpy(tmp_events + count, agent_events, |
53efb85a | 920 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 921 | free(agent_events); |
f20baf8e DG |
922 | count += nb_ev; |
923 | } | |
924 | rcu_read_unlock(); | |
925 | ||
926 | ret = count; | |
927 | *events = tmp_events; | |
aae6255e | 928 | return ret; |
f20baf8e | 929 | |
428de77a MD |
930 | error_unlock: |
931 | rcu_read_unlock(); | |
f20baf8e | 932 | error: |
aae6255e | 933 | free(tmp_events); |
f20baf8e DG |
934 | return ret; |
935 | } | |
936 | ||
937 | /* | |
022d91ba | 938 | * Create a agent app object using the given PID. |
f20baf8e DG |
939 | * |
940 | * Return newly allocated object or else NULL on error. | |
941 | */ | |
fefd409b DG |
942 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
943 | struct lttcomm_sock *sock) | |
f20baf8e | 944 | { |
022d91ba | 945 | struct agent_app *app; |
f20baf8e DG |
946 | |
947 | assert(sock); | |
948 | ||
949 | app = zmalloc(sizeof(*app)); | |
950 | if (!app) { | |
022d91ba | 951 | PERROR("zmalloc agent create"); |
f20baf8e DG |
952 | goto error; |
953 | } | |
954 | ||
955 | app->pid = pid; | |
fefd409b | 956 | app->domain = domain; |
f20baf8e | 957 | app->sock = sock; |
f20baf8e DG |
958 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
959 | ||
960 | error: | |
961 | return app; | |
962 | } | |
963 | ||
964 | /* | |
022d91ba | 965 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
966 | * |
967 | * RCU read side lock MUST be acquired. | |
968 | * | |
969 | * Return object if found else NULL. | |
970 | */ | |
022d91ba | 971 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
972 | { |
973 | struct lttng_ht_node_ulong *node; | |
974 | struct lttng_ht_iter iter; | |
022d91ba | 975 | struct agent_app *app; |
f20baf8e DG |
976 | |
977 | assert(sock >= 0); | |
978 | ||
022d91ba | 979 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
980 | node = lttng_ht_iter_get_node_ulong(&iter); |
981 | if (node == NULL) { | |
982 | goto error; | |
983 | } | |
022d91ba | 984 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 985 | |
022d91ba | 986 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
987 | return app; |
988 | ||
989 | error: | |
022d91ba | 990 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
991 | return NULL; |
992 | } | |
993 | ||
994 | /* | |
022d91ba | 995 | * Add agent application object to the global hash table. |
f20baf8e | 996 | */ |
022d91ba | 997 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
998 | { |
999 | assert(app); | |
1000 | ||
022d91ba | 1001 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
022d91ba | 1002 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
1003 | } |
1004 | ||
f20baf8e | 1005 | /* |
022d91ba | 1006 | * Delete agent application from the global hash table. |
d558f236 JG |
1007 | * |
1008 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 1009 | */ |
022d91ba | 1010 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
1011 | { |
1012 | int ret; | |
1013 | struct lttng_ht_iter iter; | |
1014 | ||
1015 | assert(app); | |
1016 | ||
022d91ba | 1017 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
1018 | |
1019 | iter.iter.node = &app->node.node; | |
022d91ba | 1020 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
1021 | assert(!ret); |
1022 | } | |
1023 | ||
1024 | /* | |
e785906c | 1025 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 1026 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 1027 | * delayed memory reclaim. |
f20baf8e | 1028 | */ |
022d91ba | 1029 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
1030 | { |
1031 | assert(app); | |
1032 | ||
1033 | if (app->sock) { | |
1034 | app->sock->ops->close(app->sock); | |
1035 | lttcomm_destroy_sock(app->sock); | |
1036 | } | |
1037 | ||
022d91ba | 1038 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
1039 | } |
1040 | ||
0475c50c | 1041 | /* |
022d91ba | 1042 | * Initialize an already allocated agent object. |
0475c50c DG |
1043 | * |
1044 | * Return 0 on success or else a negative errno value. | |
1045 | */ | |
022d91ba | 1046 | int agent_init(struct agent *agt) |
0475c50c DG |
1047 | { |
1048 | int ret; | |
1049 | ||
022d91ba | 1050 | assert(agt); |
0475c50c | 1051 | |
022d91ba DG |
1052 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
1053 | if (!agt->events) { | |
0475c50c DG |
1054 | ret = -ENOMEM; |
1055 | goto error; | |
1056 | } | |
fefd409b | 1057 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c | 1058 | |
bdf64013 | 1059 | CDS_INIT_LIST_HEAD(&agt->app_ctx_list); |
0475c50c DG |
1060 | return 0; |
1061 | ||
1062 | error: | |
1063 | return ret; | |
1064 | } | |
1065 | ||
fefd409b DG |
1066 | /* |
1067 | * Add agent object to the given hash table. | |
1068 | */ | |
1069 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
1070 | { | |
1071 | assert(agt); | |
1072 | assert(ht); | |
1073 | ||
1074 | DBG3("Agent adding from domain %d", agt->domain); | |
1075 | ||
fefd409b | 1076 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
1077 | } |
1078 | ||
1079 | /* | |
1080 | * Create an agent object for the given domain. | |
1081 | * | |
1082 | * Return the allocated agent or NULL on error. | |
1083 | */ | |
1084 | struct agent *agent_create(enum lttng_domain_type domain) | |
1085 | { | |
1086 | int ret; | |
1087 | struct agent *agt; | |
1088 | ||
3b5f70d4 | 1089 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
1090 | if (!agt) { |
1091 | goto error; | |
1092 | } | |
1093 | agt->domain = domain; | |
1094 | ||
1095 | ret = agent_init(agt); | |
1096 | if (ret < 0) { | |
1097 | free(agt); | |
988ae332 | 1098 | agt = NULL; |
fefd409b DG |
1099 | goto error; |
1100 | } | |
1101 | ||
1102 | error: | |
1103 | return agt; | |
1104 | } | |
1105 | ||
0475c50c | 1106 | /* |
51755dc8 JG |
1107 | * Create a newly allocated agent event data structure. |
1108 | * Ownership of filter_expression is taken. | |
0475c50c DG |
1109 | * |
1110 | * Return a new object else NULL on error. | |
1111 | */ | |
022d91ba | 1112 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 1113 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
51755dc8 | 1114 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 1115 | { |
51755dc8 | 1116 | struct agent_event *event = NULL; |
0475c50c | 1117 | |
6b10b3b0 AM |
1118 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
1119 | loglevel value %d and filter %s", | |
40111ba1 JG |
1120 | name, loglevel_type, loglevel_value, |
1121 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 1122 | |
51755dc8 JG |
1123 | if (!name) { |
1124 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
1125 | goto error; |
1126 | } | |
1127 | ||
51755dc8 JG |
1128 | event = zmalloc(sizeof(*event)); |
1129 | if (!event) { | |
1130 | goto error; | |
0475c50c DG |
1131 | } |
1132 | ||
51755dc8 JG |
1133 | strncpy(event->name, name, sizeof(event->name)); |
1134 | event->name[sizeof(event->name) - 1] = '\0'; | |
1135 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 1136 | |
2106efa0 | 1137 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
1138 | event->loglevel_type = loglevel_type; |
1139 | event->filter = filter; | |
1140 | event->filter_expression = filter_expression; | |
0475c50c DG |
1141 | error: |
1142 | return event; | |
1143 | } | |
1144 | ||
1145 | /* | |
022d91ba | 1146 | * Unique add of a agent event to an agent object. |
0475c50c | 1147 | */ |
022d91ba | 1148 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
1149 | { |
1150 | assert(event); | |
022d91ba DG |
1151 | assert(agt); |
1152 | assert(agt->events); | |
0475c50c | 1153 | |
022d91ba | 1154 | DBG3("Agent adding event %s", event->name); |
022d91ba | 1155 | add_unique_agent_event(agt->events, event); |
022d91ba | 1156 | agt->being_used = 1; |
0475c50c DG |
1157 | } |
1158 | ||
bdf64013 JG |
1159 | /* |
1160 | * Unique add of a agent context to an agent object. | |
1161 | */ | |
1162 | int agent_add_context(struct lttng_event_context *ctx, struct agent *agt) | |
1163 | { | |
1164 | int ret = LTTNG_OK; | |
1165 | struct agent_app_ctx *agent_ctx = NULL; | |
1166 | ||
1167 | assert(ctx); | |
1168 | assert(agt); | |
1169 | assert(agt->events); | |
1170 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
1171 | ||
1172 | agent_ctx = create_app_ctx(ctx); | |
1173 | if (!agent_ctx) { | |
1174 | ret = LTTNG_ERR_NOMEM; | |
1175 | goto end; | |
1176 | } | |
1177 | ||
1178 | DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name, | |
1179 | ctx->u.app_ctx.ctx_name); | |
1180 | cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list); | |
1181 | end: | |
1182 | return ret; | |
1183 | } | |
1184 | ||
0475c50c | 1185 | /* |
e261a6cc | 1186 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 1187 | * |
e261a6cc PP |
1188 | * RCU read side lock MUST be acquired. It must be held for the |
1189 | * duration of the iteration. | |
4a4ab2c3 | 1190 | * |
e261a6cc | 1191 | * Sets the given iterator. |
4a4ab2c3 | 1192 | */ |
e261a6cc PP |
1193 | void agent_find_events_by_name(const char *name, struct agent *agt, |
1194 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 1195 | { |
4a4ab2c3 | 1196 | struct lttng_ht *ht; |
022d91ba | 1197 | struct agent_ht_key key; |
4a4ab2c3 DG |
1198 | |
1199 | assert(name); | |
022d91ba DG |
1200 | assert(agt); |
1201 | assert(agt->events); | |
e261a6cc | 1202 | assert(iter); |
4a4ab2c3 | 1203 | |
022d91ba | 1204 | ht = agt->events; |
4a4ab2c3 DG |
1205 | key.name = name; |
1206 | ||
1207 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
1208 | ht_match_event_by_name, &key, &iter->iter); |
1209 | } | |
4a4ab2c3 | 1210 | |
e261a6cc PP |
1211 | /* |
1212 | * Get the next agent event duplicate by name. This should be called | |
1213 | * after a call to agent_find_events_by_name() to iterate on events. | |
1214 | * | |
1215 | * The RCU read lock must be held during the iteration and for as long | |
1216 | * as the object the iterator points to remains in use. | |
1217 | */ | |
1218 | void agent_event_next_duplicate(const char *name, | |
1219 | struct agent *agt, struct lttng_ht_iter* iter) | |
1220 | { | |
1221 | struct agent_ht_key key; | |
4a4ab2c3 | 1222 | |
e261a6cc PP |
1223 | key.name = name; |
1224 | ||
1225 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
1226 | &key, &iter->iter); | |
4a4ab2c3 DG |
1227 | } |
1228 | ||
1229 | /* | |
6b10b3b0 | 1230 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c | 1231 | * |
1e17eae2 JG |
1232 | * RCU read side lock MUST be acquired. It must be kept for as long as |
1233 | * the returned agent_event is used. | |
0475c50c DG |
1234 | * |
1235 | * Return object if found else NULL. | |
1236 | */ | |
a9319624 PP |
1237 | struct agent_event *agent_find_event(const char *name, |
1238 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
6b10b3b0 | 1239 | char *filter_expression, struct agent *agt) |
0475c50c DG |
1240 | { |
1241 | struct lttng_ht_node_str *node; | |
1242 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 1243 | struct lttng_ht *ht; |
022d91ba | 1244 | struct agent_ht_key key; |
0475c50c DG |
1245 | |
1246 | assert(name); | |
022d91ba DG |
1247 | assert(agt); |
1248 | assert(agt->events); | |
0475c50c | 1249 | |
022d91ba | 1250 | ht = agt->events; |
4a4ab2c3 | 1251 | key.name = name; |
2106efa0 | 1252 | key.loglevel_value = loglevel_value; |
a9319624 | 1253 | key.loglevel_type = loglevel_type; |
6b10b3b0 | 1254 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
1255 | |
1256 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1257 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
1258 | node = lttng_ht_iter_get_node_str(&iter); |
1259 | if (node == NULL) { | |
1260 | goto error; | |
1261 | } | |
1262 | ||
022d91ba DG |
1263 | DBG3("Agent event found %s.", name); |
1264 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
1265 | |
1266 | error: | |
a51e817b | 1267 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
1268 | return NULL; |
1269 | } | |
1270 | ||
0475c50c | 1271 | /* |
022d91ba DG |
1272 | * Free given agent event. This event must not be globally visible at this |
1273 | * point (only expected to be used on failure just after event creation). After | |
1274 | * this call, the pointer is not usable anymore. | |
0475c50c | 1275 | */ |
022d91ba | 1276 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
1277 | { |
1278 | assert(event); | |
1279 | ||
971da06a | 1280 | free(event->filter); |
8404118c | 1281 | free(event->filter_expression); |
51755dc8 | 1282 | free(event->exclusion); |
0475c50c DG |
1283 | free(event); |
1284 | } | |
1285 | ||
bdf64013 JG |
1286 | static |
1287 | void destroy_app_ctx_rcu(struct rcu_head *head) | |
1288 | { | |
1289 | struct agent_app_ctx *ctx = | |
1290 | caa_container_of(head, struct agent_app_ctx, rcu_node); | |
1291 | ||
1292 | destroy_app_ctx(ctx); | |
1293 | } | |
1294 | ||
0475c50c | 1295 | /* |
35ed21a5 | 1296 | * Destroy an agent completely. |
0475c50c | 1297 | */ |
022d91ba | 1298 | void agent_destroy(struct agent *agt) |
0475c50c DG |
1299 | { |
1300 | struct lttng_ht_node_str *node; | |
1301 | struct lttng_ht_iter iter; | |
bdf64013 | 1302 | struct agent_app_ctx *ctx; |
0475c50c | 1303 | |
022d91ba | 1304 | assert(agt); |
0475c50c | 1305 | |
022d91ba | 1306 | DBG3("Agent destroy"); |
0475c50c | 1307 | |
0475c50c | 1308 | rcu_read_lock(); |
022d91ba | 1309 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 1310 | int ret; |
022d91ba | 1311 | struct agent_event *event; |
29c0fd4d DG |
1312 | |
1313 | /* | |
bdf64013 JG |
1314 | * When destroying an event, we have to try to disable it on the |
1315 | * agent side so the event stops generating data. The return | |
1316 | * value is not important since we have to continue anyway | |
1317 | * destroying the object. | |
29c0fd4d | 1318 | */ |
022d91ba DG |
1319 | event = caa_container_of(node, struct agent_event, node); |
1320 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1321 | |
022d91ba | 1322 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1323 | assert(!ret); |
022d91ba | 1324 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c | 1325 | } |
0475c50c | 1326 | |
bdf64013 JG |
1327 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
1328 | (void) disable_context(ctx, agt->domain); | |
1329 | cds_list_del(&ctx->list_node); | |
1330 | call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); | |
1331 | } | |
1332 | rcu_read_unlock(); | |
f8be902b | 1333 | ht_cleanup_push(agt->events); |
35ed21a5 | 1334 | free(agt); |
f20baf8e DG |
1335 | } |
1336 | ||
1337 | /* | |
6a4e4039 | 1338 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1339 | */ |
6a4e4039 | 1340 | int agent_app_ht_alloc(void) |
f20baf8e | 1341 | { |
6a4e4039 JG |
1342 | int ret = 0; |
1343 | ||
022d91ba DG |
1344 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1345 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1346 | ret = -1; |
f20baf8e DG |
1347 | } |
1348 | ||
6a4e4039 JG |
1349 | return ret; |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Destroy a agent application by socket. | |
1354 | */ | |
1355 | void agent_destroy_app_by_sock(int sock) | |
1356 | { | |
1357 | struct agent_app *app; | |
1358 | ||
1359 | assert(sock >= 0); | |
1360 | ||
1361 | /* | |
1362 | * Not finding an application is a very important error that should NEVER | |
1363 | * happen. The hash table deletion is ONLY done through this call when the | |
1364 | * main sessiond thread is torn down. | |
1365 | */ | |
1366 | rcu_read_lock(); | |
1367 | app = agent_find_app_by_sock(sock); | |
1368 | assert(app); | |
1369 | ||
1370 | /* RCU read side lock is assumed to be held by this function. */ | |
1371 | agent_delete_app(app); | |
1372 | ||
1373 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1374 | agent_destroy_app(app); | |
1375 | rcu_read_unlock(); | |
1376 | } | |
1377 | ||
1378 | /* | |
1379 | * Clean-up the agent app hash table and destroy it. | |
1380 | */ | |
1381 | void agent_app_ht_clean(void) | |
1382 | { | |
1383 | struct lttng_ht_node_ulong *node; | |
1384 | struct lttng_ht_iter iter; | |
1385 | ||
a433283e JG |
1386 | if (!agent_apps_ht_by_sock) { |
1387 | return; | |
1388 | } | |
6a4e4039 JG |
1389 | rcu_read_lock(); |
1390 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1391 | struct agent_app *app; | |
1392 | ||
1393 | app = caa_container_of(node, struct agent_app, node); | |
1394 | agent_destroy_app_by_sock(app->sock->fd); | |
1395 | } | |
1396 | rcu_read_unlock(); | |
1397 | ||
1398 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1399 | } |
1400 | ||
1401 | /* | |
022d91ba | 1402 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1403 | * |
1404 | * Note that this function is most likely to be used with a tracing session | |
1405 | * thus the caller should make sure to hold the appropriate lock(s). | |
1406 | */ | |
022d91ba | 1407 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1408 | { |
1409 | int ret; | |
022d91ba DG |
1410 | struct agent_app *app; |
1411 | struct agent_event *event; | |
f20baf8e | 1412 | struct lttng_ht_iter iter; |
bdf64013 | 1413 | struct agent_app_ctx *ctx; |
f20baf8e | 1414 | |
022d91ba | 1415 | assert(agt); |
f20baf8e DG |
1416 | assert(sock >= 0); |
1417 | ||
022d91ba | 1418 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1419 | |
1420 | rcu_read_lock(); | |
bdf64013 JG |
1421 | app = agent_find_app_by_sock(sock); |
1422 | /* | |
1423 | * We are in the registration path thus if the application is gone, | |
1424 | * there is a serious code flow error. | |
1425 | */ | |
1426 | assert(app); | |
022d91ba | 1427 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1428 | /* Skip event if disabled. */ |
1429 | if (!event->enabled) { | |
1430 | continue; | |
1431 | } | |
1432 | ||
f20baf8e DG |
1433 | ret = enable_event(app, event); |
1434 | if (ret != LTTNG_OK) { | |
022d91ba | 1435 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1436 | event->name, app->pid, app->sock->fd); |
1437 | /* Let's try the others here and don't assume the app is dead. */ | |
1438 | continue; | |
1439 | } | |
1440 | } | |
bdf64013 JG |
1441 | |
1442 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { | |
1443 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); | |
1444 | if (ret != LTTNG_OK) { | |
1445 | DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", | |
1446 | ctx->provider_name, ctx->ctx_name, | |
1447 | app->pid, app->sock->fd); | |
1448 | continue; | |
1449 | } | |
1450 | } | |
1451 | ||
f20baf8e | 1452 | rcu_read_unlock(); |
0475c50c | 1453 | } |