Commit | Line | Data |
---|---|---|
0475c50c | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
0475c50c | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
0475c50c | 6 | * |
0475c50c DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
0475c50c | 10 | #include <assert.h> |
f20baf8e | 11 | #include <urcu/uatomic.h> |
bdf64013 | 12 | #include <urcu/rculist.h> |
0475c50c DG |
13 | |
14 | #include <common/common.h> | |
022d91ba | 15 | #include <common/sessiond-comm/agent.h> |
0475c50c | 16 | |
f263b7fd JD |
17 | #include <common/compat/endian.h> |
18 | ||
022d91ba | 19 | #include "agent.h" |
f20baf8e | 20 | #include "ust-app.h" |
0475c50c | 21 | #include "utils.h" |
6712db61 | 22 | #include "common/error.h" |
23c2bd47 JG |
23 | |
24 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) | |
25 | ||
bdf64013 JG |
26 | /* |
27 | * Agent application context representation. | |
28 | */ | |
29 | struct agent_app_ctx { | |
30 | char *provider_name; | |
31 | char *ctx_name; | |
32 | ||
33 | /* agent_app_ctx are part of the agent app_ctx_list. */ | |
34 | struct cds_list_head list_node; | |
35 | ||
36 | /* For call_rcu teardown. */ | |
37 | struct rcu_head rcu_node; | |
38 | }; | |
39 | ||
23c2bd47 JG |
40 | /* |
41 | * Human readable agent return code. | |
42 | */ | |
43 | static const char *error_string_array[] = { | |
44 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
45 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
46 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
47 | ||
48 | /* Last element */ | |
49 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
50 | }; | |
51 | ||
52 | static | |
53 | void log_reply_code(uint32_t in_reply_ret_code) | |
54 | { | |
55 | int level = PRINT_DBG3; | |
56 | /* | |
57 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
58 | * sanitized value (used to retrieve the human readable string) and the | |
59 | * original value which is logged as-is. | |
60 | */ | |
61 | uint32_t reply_ret_code = in_reply_ret_code; | |
62 | ||
63 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
64 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
65 | reply_ret_code = AGENT_RET_CODE_NR; | |
66 | level = PRINT_ERR; | |
67 | } | |
68 | ||
69 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
70 | error_string_array[AGENT_RET_CODE_INDEX( | |
71 | reply_ret_code)], | |
72 | in_reply_ret_code); | |
73 | } | |
0475c50c | 74 | |
4a4ab2c3 DG |
75 | /* |
76 | * Match function for the events hash table lookup by name. | |
77 | */ | |
78 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
79 | const void *_key) | |
80 | { | |
022d91ba DG |
81 | struct agent_event *event; |
82 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
83 | |
84 | assert(node); | |
85 | assert(_key); | |
86 | ||
022d91ba | 87 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
88 | key = _key; |
89 | ||
90 | /* Match 1 elements of the key: name. */ | |
91 | ||
92 | /* Event name */ | |
93 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
94 | goto no_match; | |
95 | } | |
96 | /* Match. */ | |
97 | return 1; | |
98 | ||
99 | no_match: | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Match function for the events hash table lookup by name and loglevel. | |
105 | */ | |
106 | static int ht_match_event(struct cds_lfht_node *node, | |
107 | const void *_key) | |
108 | { | |
022d91ba DG |
109 | struct agent_event *event; |
110 | const struct agent_ht_key *key; | |
19a97244 | 111 | int ll_match; |
4a4ab2c3 DG |
112 | |
113 | assert(node); | |
114 | assert(_key); | |
115 | ||
022d91ba | 116 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
117 | key = _key; |
118 | ||
119 | /* Match 2 elements of the key: name and loglevel. */ | |
120 | ||
121 | /* Event name */ | |
122 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
123 | goto no_match; | |
124 | } | |
125 | ||
a9319624 | 126 | /* Event loglevel value and type. */ |
19a97244 PP |
127 | ll_match = loglevels_match(event->loglevel_type, |
128 | event->loglevel_value, key->loglevel_type, | |
129 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
130 | ||
131 | if (!ll_match) { | |
4a4ab2c3 DG |
132 | goto no_match; |
133 | } | |
a9319624 | 134 | |
6b10b3b0 | 135 | /* Filter expression */ |
d42bc3c8 | 136 | if (!!event->filter_expression != !!key->filter_expression) { |
71e147d0 | 137 | /* One has a filter expression, the other does not */ |
6b10b3b0 AM |
138 | goto no_match; |
139 | } | |
140 | ||
71e147d0 PP |
141 | if (event->filter_expression) { |
142 | if (strncmp(event->filter_expression, key->filter_expression, | |
143 | strlen(event->filter_expression)) != 0) { | |
144 | goto no_match; | |
145 | } | |
146 | } | |
147 | ||
4a4ab2c3 DG |
148 | return 1; |
149 | ||
150 | no_match: | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
022d91ba | 155 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 156 | */ |
022d91ba DG |
157 | static void add_unique_agent_event(struct lttng_ht *ht, |
158 | struct agent_event *event) | |
4a4ab2c3 DG |
159 | { |
160 | struct cds_lfht_node *node_ptr; | |
022d91ba | 161 | struct agent_ht_key key; |
4a4ab2c3 DG |
162 | |
163 | assert(ht); | |
164 | assert(ht->ht); | |
165 | assert(event); | |
166 | ||
167 | key.name = event->name; | |
2106efa0 | 168 | key.loglevel_value = event->loglevel_value; |
a9319624 | 169 | key.loglevel_type = event->loglevel_type; |
6b10b3b0 | 170 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
171 | |
172 | node_ptr = cds_lfht_add_unique(ht->ht, | |
173 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
174 | ht_match_event, &key, &event->node.node); | |
175 | assert(node_ptr == &event->node.node); | |
176 | } | |
177 | ||
0475c50c | 178 | /* |
022d91ba | 179 | * URCU delayed agent event reclaim. |
0475c50c | 180 | */ |
022d91ba | 181 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
182 | { |
183 | struct lttng_ht_node_str *node = | |
184 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
185 | struct agent_event *event = |
186 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 187 | |
992febc7 | 188 | agent_destroy_event(event); |
0475c50c DG |
189 | } |
190 | ||
f20baf8e | 191 | /* |
022d91ba | 192 | * URCU delayed agent app reclaim. |
f20baf8e | 193 | */ |
022d91ba | 194 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
195 | { |
196 | struct lttng_ht_node_ulong *node = | |
197 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
198 | struct agent_app *app = |
199 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
200 | |
201 | free(app); | |
202 | } | |
203 | ||
204 | /* | |
022d91ba DG |
205 | * Communication with the agent. Send the message header to the given socket in |
206 | * big endian. | |
f20baf8e DG |
207 | * |
208 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
209 | */ | |
210 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
211 | uint32_t cmd, uint32_t cmd_version) | |
212 | { | |
213 | int ret; | |
214 | ssize_t size; | |
022d91ba | 215 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
216 | |
217 | assert(sock); | |
218 | ||
53efb85a | 219 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
220 | msg.data_size = htobe64(data_size); |
221 | msg.cmd = htobe32(cmd); | |
222 | msg.cmd_version = htobe32(cmd_version); | |
223 | ||
224 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
225 | if (size < sizeof(msg)) { | |
226 | ret = -errno; | |
227 | goto error; | |
228 | } | |
229 | ret = 0; | |
230 | ||
231 | error: | |
232 | return ret; | |
233 | } | |
234 | ||
235 | /* | |
022d91ba DG |
236 | * Communication call with the agent. Send the payload to the given socket. The |
237 | * header MUST be sent prior to this call. | |
f20baf8e DG |
238 | * |
239 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
240 | */ | |
bdf64013 | 241 | static int send_payload(struct lttcomm_sock *sock, const void *data, |
f20baf8e DG |
242 | size_t size) |
243 | { | |
244 | int ret; | |
245 | ssize_t len; | |
246 | ||
247 | assert(sock); | |
248 | assert(data); | |
249 | ||
250 | len = sock->ops->sendmsg(sock, data, size, 0); | |
251 | if (len < size) { | |
252 | ret = -errno; | |
253 | goto error; | |
254 | } | |
255 | ret = 0; | |
256 | ||
257 | error: | |
258 | return ret; | |
259 | } | |
260 | ||
261 | /* | |
022d91ba DG |
262 | * Communication call with the agent. Receive reply from the agent using the |
263 | * given socket. | |
f20baf8e DG |
264 | * |
265 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
266 | */ | |
267 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
268 | { | |
269 | int ret; | |
270 | ssize_t len; | |
271 | ||
272 | assert(sock); | |
273 | assert(buf); | |
274 | ||
275 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
276 | if (len < size) { | |
277 | ret = -errno; | |
278 | goto error; | |
279 | } | |
280 | ret = 0; | |
281 | ||
282 | error: | |
283 | return ret; | |
284 | } | |
285 | ||
3c6a091f | 286 | /* |
428de77a | 287 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
288 | * |
289 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
290 | * On success, the caller is responsible for freeing the memory |
291 | * allocated for "events". | |
3c6a091f | 292 | */ |
022d91ba | 293 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
294 | { |
295 | int ret, i, len = 0, offset = 0; | |
296 | uint32_t nb_event; | |
297 | size_t data_size; | |
d84af1a4 | 298 | uint32_t reply_ret_code; |
3c6a091f | 299 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
300 | struct lttcomm_agent_list_reply *reply = NULL; |
301 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
302 | |
303 | assert(app); | |
304 | assert(app->sock); | |
305 | assert(events); | |
306 | ||
022d91ba | 307 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
308 | app->sock->fd); |
309 | ||
022d91ba | 310 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
311 | if (ret < 0) { |
312 | goto error_io; | |
313 | } | |
314 | ||
315 | /* Get list header so we know how much we'll receive. */ | |
316 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
317 | if (ret < 0) { | |
318 | goto error_io; | |
319 | } | |
320 | ||
d84af1a4 JG |
321 | reply_ret_code = be32toh(reply_hdr.ret_code); |
322 | log_reply_code(reply_ret_code); | |
323 | switch (reply_ret_code) { | |
022d91ba | 324 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
325 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
326 | break; | |
327 | default: | |
3bd9aaeb | 328 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
329 | goto error; |
330 | } | |
331 | ||
332 | reply = zmalloc(data_size); | |
333 | if (!reply) { | |
334 | ret = LTTNG_ERR_NOMEM; | |
335 | goto error; | |
336 | } | |
337 | ||
338 | /* Get the list with the appropriate data size. */ | |
339 | ret = recv_reply(app->sock, reply, data_size); | |
340 | if (ret < 0) { | |
341 | goto error_io; | |
342 | } | |
343 | ||
344 | nb_event = be32toh(reply->nb_event); | |
345 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
346 | if (!tmp_events) { | |
347 | ret = LTTNG_ERR_NOMEM; | |
348 | goto error; | |
349 | } | |
350 | ||
351 | for (i = 0; i < nb_event; i++) { | |
352 | offset += len; | |
0a85e7a3 MD |
353 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
354 | sizeof(tmp_events[i].name))) { | |
355 | ret = LTTNG_ERR_INVALID; | |
356 | goto error; | |
357 | } | |
3c6a091f DG |
358 | tmp_events[i].pid = app->pid; |
359 | tmp_events[i].enabled = -1; | |
360 | len = strlen(reply->payload + offset) + 1; | |
361 | } | |
362 | ||
363 | *events = tmp_events; | |
364 | ||
365 | free(reply); | |
366 | return nb_event; | |
367 | ||
368 | error_io: | |
369 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
370 | error: | |
371 | free(reply); | |
372 | free(tmp_events); | |
373 | return -ret; | |
374 | ||
375 | } | |
376 | ||
f20baf8e | 377 | /* |
022d91ba DG |
378 | * Internal enable agent event on a agent application. This function |
379 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
380 | * |
381 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
382 | */ | |
022d91ba | 383 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
384 | { |
385 | int ret; | |
a0ba721c | 386 | char *bytes_to_send; |
f20baf8e | 387 | uint64_t data_size; |
a0ba721c | 388 | size_t filter_expression_length; |
f4f9d4db | 389 | uint32_t reply_ret_code; |
bdf64013 | 390 | struct lttcomm_agent_enable_event msg; |
022d91ba | 391 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
392 | |
393 | assert(app); | |
394 | assert(app->sock); | |
395 | assert(event); | |
396 | ||
022d91ba | 397 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
398 | app->pid, app->sock->fd); |
399 | ||
a0ba721c AM |
400 | /* |
401 | * Calculate the payload's size, which is the fixed-size struct followed | |
402 | * by the variable-length filter expression (+1 for the ending \0). | |
403 | */ | |
404 | if (!event->filter_expression) { | |
405 | filter_expression_length = 0; | |
406 | } else { | |
407 | filter_expression_length = strlen(event->filter_expression) + 1; | |
408 | } | |
409 | data_size = sizeof(msg) + filter_expression_length; | |
f20baf8e | 410 | |
53efb85a | 411 | memset(&msg, 0, sizeof(msg)); |
a9bfd666 JG |
412 | msg.loglevel_value = htobe32(event->loglevel_value); |
413 | msg.loglevel_type = htobe32(event->loglevel_type); | |
bb45c03e MD |
414 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { |
415 | ret = LTTNG_ERR_INVALID; | |
416 | goto error; | |
417 | } | |
a9bfd666 | 418 | msg.filter_expression_length = htobe32(filter_expression_length); |
a0ba721c | 419 | |
bb45c03e MD |
420 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
421 | if (ret < 0) { | |
422 | goto error_io; | |
423 | } | |
424 | ||
a0ba721c AM |
425 | bytes_to_send = zmalloc(data_size); |
426 | if (!bytes_to_send) { | |
427 | ret = LTTNG_ERR_NOMEM; | |
428 | goto error; | |
429 | } | |
430 | ||
431 | memcpy(bytes_to_send, &msg, sizeof(msg)); | |
432 | if (filter_expression_length > 0) { | |
433 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, | |
434 | filter_expression_length); | |
435 | } | |
436 | ||
437 | ret = send_payload(app->sock, bytes_to_send, data_size); | |
438 | free(bytes_to_send); | |
f20baf8e DG |
439 | if (ret < 0) { |
440 | goto error_io; | |
441 | } | |
442 | ||
443 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
444 | if (ret < 0) { | |
445 | goto error_io; | |
446 | } | |
447 | ||
f4f9d4db JG |
448 | reply_ret_code = be32toh(reply.ret_code); |
449 | log_reply_code(reply_ret_code); | |
450 | switch (reply_ret_code) { | |
022d91ba | 451 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 452 | break; |
022d91ba | 453 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
454 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
455 | goto error; | |
456 | default: | |
3bd9aaeb | 457 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
458 | goto error; |
459 | } | |
460 | ||
461 | return LTTNG_OK; | |
462 | ||
463 | error_io: | |
464 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
465 | error: | |
466 | return ret; | |
467 | } | |
468 | ||
bdf64013 JG |
469 | /* |
470 | * Send Pascal-style string. Size is sent as a 32-bit big endian integer. | |
471 | */ | |
472 | static | |
473 | int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len) | |
474 | { | |
475 | int ret; | |
476 | uint32_t len_be; | |
477 | ||
478 | len_be = htobe32(len); | |
479 | ret = send_payload(sock, &len_be, sizeof(len_be)); | |
480 | if (ret) { | |
481 | goto end; | |
482 | } | |
483 | ||
484 | ret = send_payload(sock, str, len); | |
485 | if (ret) { | |
486 | goto end; | |
487 | } | |
488 | end: | |
489 | return ret; | |
490 | } | |
491 | ||
492 | /* | |
493 | * Internal enable application context on an agent application. This function | |
494 | * communicates with the agent to enable a given application context. | |
495 | * | |
496 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
497 | */ | |
498 | static int app_context_op(struct agent_app *app, | |
499 | struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd) | |
500 | { | |
501 | int ret; | |
502 | uint32_t reply_ret_code; | |
503 | struct lttcomm_agent_generic_reply reply; | |
504 | size_t app_ctx_provider_name_len, app_ctx_name_len, data_size; | |
505 | ||
506 | assert(app); | |
507 | assert(app->sock); | |
508 | assert(ctx); | |
509 | assert(cmd == AGENT_CMD_APP_CTX_ENABLE || | |
510 | cmd == AGENT_CMD_APP_CTX_DISABLE); | |
511 | ||
512 | DBG2("Agent %s application %s:%s for app pid: %d and socket %d", | |
513 | cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling", | |
514 | ctx->provider_name, ctx->ctx_name, | |
515 | app->pid, app->sock->fd); | |
516 | ||
517 | /* | |
518 | * Calculate the payload's size, which consists of the size (u32, BE) | |
519 | * of the provider name, the NULL-terminated provider name string, the | |
520 | * size (u32, BE) of the context name, followed by the NULL-terminated | |
521 | * context name string. | |
522 | */ | |
523 | app_ctx_provider_name_len = strlen(ctx->provider_name) + 1; | |
524 | app_ctx_name_len = strlen(ctx->ctx_name) + 1; | |
525 | data_size = sizeof(uint32_t) + app_ctx_provider_name_len + | |
526 | sizeof(uint32_t) + app_ctx_name_len; | |
527 | ||
528 | ret = send_header(app->sock, data_size, cmd, 0); | |
529 | if (ret < 0) { | |
530 | goto error_io; | |
531 | } | |
532 | ||
533 | if (app_ctx_provider_name_len > UINT32_MAX || | |
534 | app_ctx_name_len > UINT32_MAX) { | |
535 | ERR("Application context name > MAX_UINT32"); | |
536 | ret = LTTNG_ERR_INVALID; | |
537 | goto error; | |
538 | } | |
539 | ||
540 | ret = send_pstring(app->sock, ctx->provider_name, | |
541 | (uint32_t) app_ctx_provider_name_len); | |
542 | if (ret < 0) { | |
543 | goto error_io; | |
544 | } | |
545 | ||
546 | ret = send_pstring(app->sock, ctx->ctx_name, | |
547 | (uint32_t) app_ctx_name_len); | |
548 | if (ret < 0) { | |
549 | goto error_io; | |
550 | } | |
551 | ||
552 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
553 | if (ret < 0) { | |
554 | goto error_io; | |
555 | } | |
556 | ||
557 | reply_ret_code = be32toh(reply.ret_code); | |
558 | log_reply_code(reply_ret_code); | |
559 | switch (reply_ret_code) { | |
560 | case AGENT_RET_CODE_SUCCESS: | |
561 | break; | |
562 | default: | |
563 | ret = LTTNG_ERR_UNK; | |
564 | goto error; | |
565 | } | |
566 | ||
567 | return LTTNG_OK; | |
568 | ||
569 | error_io: | |
570 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
571 | error: | |
572 | return ret; | |
573 | } | |
574 | ||
f20baf8e | 575 | /* |
022d91ba DG |
576 | * Internal disable agent event call on a agent application. This function |
577 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
578 | * |
579 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
580 | */ | |
022d91ba | 581 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
582 | { |
583 | int ret; | |
584 | uint64_t data_size; | |
517992f8 | 585 | uint32_t reply_ret_code; |
bdf64013 | 586 | struct lttcomm_agent_disable_event msg; |
022d91ba | 587 | struct lttcomm_agent_generic_reply reply; |
f20baf8e DG |
588 | |
589 | assert(app); | |
590 | assert(app->sock); | |
591 | assert(event); | |
592 | ||
022d91ba | 593 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
594 | app->pid, app->sock->fd); |
595 | ||
596 | data_size = sizeof(msg); | |
63be730a MD |
597 | memset(&msg, 0, sizeof(msg)); |
598 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
599 | ret = LTTNG_ERR_INVALID; | |
600 | goto error; | |
601 | } | |
f20baf8e | 602 | |
022d91ba | 603 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
604 | if (ret < 0) { |
605 | goto error_io; | |
606 | } | |
607 | ||
f20baf8e DG |
608 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
609 | if (ret < 0) { | |
610 | goto error_io; | |
611 | } | |
612 | ||
613 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
614 | if (ret < 0) { | |
615 | goto error_io; | |
616 | } | |
617 | ||
517992f8 JG |
618 | reply_ret_code = be32toh(reply.ret_code); |
619 | log_reply_code(reply_ret_code); | |
620 | switch (reply_ret_code) { | |
022d91ba DG |
621 | case AGENT_RET_CODE_SUCCESS: |
622 | break; | |
623 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
624 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
625 | goto error; | |
626 | default: | |
3bd9aaeb | 627 | ret = LTTNG_ERR_UNK; |
022d91ba | 628 | goto error; |
f20baf8e DG |
629 | } |
630 | ||
631 | return LTTNG_OK; | |
632 | ||
633 | error_io: | |
634 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
635 | error: | |
636 | return ret; | |
637 | } | |
638 | ||
1b500e7a | 639 | /* |
022d91ba | 640 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
641 | * |
642 | * Return 0 on success or else a negative value. | |
643 | */ | |
022d91ba | 644 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
645 | { |
646 | assert(app); | |
647 | assert(app->sock); | |
648 | ||
022d91ba | 649 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 650 | |
b26d1f5c | 651 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
652 | } |
653 | ||
f20baf8e | 654 | /* |
022d91ba | 655 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
656 | * daemon. |
657 | * | |
658 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
659 | */ | |
fefd409b DG |
660 | int agent_enable_event(struct agent_event *event, |
661 | enum lttng_domain_type domain) | |
f20baf8e DG |
662 | { |
663 | int ret; | |
022d91ba | 664 | struct agent_app *app; |
f20baf8e DG |
665 | struct lttng_ht_iter iter; |
666 | ||
667 | assert(event); | |
668 | ||
669 | rcu_read_lock(); | |
670 | ||
022d91ba | 671 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 672 | node.node) { |
fefd409b DG |
673 | if (app->domain != domain) { |
674 | continue; | |
675 | } | |
676 | ||
022d91ba | 677 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
678 | ret = enable_event(app, event); |
679 | if (ret != LTTNG_OK) { | |
680 | goto error; | |
681 | } | |
f20baf8e DG |
682 | } |
683 | ||
3c6a091f | 684 | event->enabled = 1; |
f20baf8e DG |
685 | ret = LTTNG_OK; |
686 | ||
687 | error: | |
688 | rcu_read_unlock(); | |
689 | return ret; | |
690 | } | |
691 | ||
bdf64013 JG |
692 | static |
693 | void destroy_app_ctx(struct agent_app_ctx *ctx) | |
694 | { | |
695 | free(ctx->provider_name); | |
696 | free(ctx->ctx_name); | |
697 | free(ctx); | |
698 | } | |
699 | ||
700 | static | |
df4f5a87 | 701 | struct agent_app_ctx *create_app_ctx(const struct lttng_event_context *ctx) |
bdf64013 JG |
702 | { |
703 | struct agent_app_ctx *agent_ctx = NULL; | |
704 | ||
705 | if (!ctx) { | |
706 | goto end; | |
707 | } | |
708 | ||
709 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
710 | agent_ctx = zmalloc(sizeof(*ctx)); | |
711 | if (!agent_ctx) { | |
712 | goto end; | |
713 | } | |
714 | ||
715 | agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name); | |
716 | agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name); | |
717 | if (!agent_ctx->provider_name || !agent_ctx->ctx_name) { | |
718 | destroy_app_ctx(agent_ctx); | |
719 | agent_ctx = NULL; | |
720 | } | |
721 | end: | |
722 | return agent_ctx; | |
723 | } | |
724 | ||
725 | /* | |
726 | * Enable agent context on every agent applications registered with the session | |
727 | * daemon. | |
728 | * | |
729 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
730 | */ | |
df4f5a87 | 731 | int agent_enable_context(const struct lttng_event_context *ctx, |
bdf64013 JG |
732 | enum lttng_domain_type domain) |
733 | { | |
734 | int ret; | |
735 | struct agent_app *app; | |
736 | struct lttng_ht_iter iter; | |
737 | ||
738 | assert(ctx); | |
739 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
740 | ret = LTTNG_ERR_INVALID; | |
741 | goto error; | |
742 | } | |
743 | ||
744 | rcu_read_lock(); | |
745 | ||
746 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, | |
747 | node.node) { | |
748 | struct agent_app_ctx *agent_ctx; | |
749 | ||
750 | if (app->domain != domain) { | |
751 | continue; | |
752 | } | |
753 | ||
754 | agent_ctx = create_app_ctx(ctx); | |
755 | if (!agent_ctx) { | |
a33c2651 | 756 | ret = LTTNG_ERR_NOMEM; |
bdf64013 JG |
757 | goto error_unlock; |
758 | } | |
759 | ||
760 | /* Enable event on agent application through TCP socket. */ | |
761 | ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); | |
c12618b5 | 762 | destroy_app_ctx(agent_ctx); |
bdf64013 | 763 | if (ret != LTTNG_OK) { |
bdf64013 JG |
764 | goto error_unlock; |
765 | } | |
766 | } | |
767 | ||
768 | ret = LTTNG_OK; | |
769 | ||
770 | error_unlock: | |
771 | rcu_read_unlock(); | |
772 | error: | |
773 | return ret; | |
774 | } | |
775 | ||
f20baf8e | 776 | /* |
bdf64013 | 777 | * Disable agent event on every agent application registered with the session |
f20baf8e DG |
778 | * daemon. |
779 | * | |
780 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
781 | */ | |
fefd409b DG |
782 | int agent_disable_event(struct agent_event *event, |
783 | enum lttng_domain_type domain) | |
f20baf8e | 784 | { |
f1bc0129 | 785 | int ret = LTTNG_OK; |
022d91ba | 786 | struct agent_app *app; |
f20baf8e DG |
787 | struct lttng_ht_iter iter; |
788 | ||
789 | assert(event); | |
f1bc0129 JG |
790 | if (!event->enabled) { |
791 | goto end; | |
792 | } | |
f20baf8e DG |
793 | |
794 | rcu_read_lock(); | |
795 | ||
022d91ba | 796 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 797 | node.node) { |
fefd409b DG |
798 | if (app->domain != domain) { |
799 | continue; | |
800 | } | |
801 | ||
022d91ba | 802 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
803 | ret = disable_event(app, event); |
804 | if (ret != LTTNG_OK) { | |
805 | goto error; | |
806 | } | |
f20baf8e DG |
807 | } |
808 | ||
3c6a091f | 809 | event->enabled = 0; |
f20baf8e DG |
810 | |
811 | error: | |
812 | rcu_read_unlock(); | |
f1bc0129 | 813 | end: |
f20baf8e DG |
814 | return ret; |
815 | } | |
816 | ||
bdf64013 JG |
817 | /* |
818 | * Disable agent context on every agent application registered with the session | |
819 | * daemon. | |
820 | * | |
821 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
822 | */ | |
46440d0c SM |
823 | static int disable_context(struct agent_app_ctx *ctx, |
824 | enum lttng_domain_type domain) | |
bdf64013 JG |
825 | { |
826 | int ret = LTTNG_OK; | |
827 | struct agent_app *app; | |
828 | struct lttng_ht_iter iter; | |
829 | ||
830 | assert(ctx); | |
831 | ||
832 | rcu_read_lock(); | |
833 | DBG2("Disabling agent application context %s:%s", | |
834 | ctx->provider_name, ctx->ctx_name); | |
835 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, | |
836 | node.node) { | |
837 | if (app->domain != domain) { | |
838 | continue; | |
839 | } | |
840 | ||
841 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); | |
842 | if (ret != LTTNG_OK) { | |
843 | goto end; | |
844 | } | |
845 | } | |
846 | end: | |
847 | rcu_read_unlock(); | |
848 | return ret; | |
849 | } | |
850 | ||
f20baf8e | 851 | /* |
022d91ba DG |
852 | * Ask every agent for the list of possible event. Events is allocated with the |
853 | * events of every agent application. | |
f20baf8e DG |
854 | * |
855 | * Return the number of events or else a negative value. | |
856 | */ | |
f60140a1 DG |
857 | int agent_list_events(struct lttng_event **events, |
858 | enum lttng_domain_type domain) | |
f20baf8e DG |
859 | { |
860 | int ret; | |
861 | size_t nbmem, count = 0; | |
022d91ba | 862 | struct agent_app *app; |
aae6255e | 863 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
864 | struct lttng_ht_iter iter; |
865 | ||
866 | assert(events); | |
867 | ||
0e115563 DG |
868 | DBG2("Agent listing events for domain %d", domain); |
869 | ||
f20baf8e DG |
870 | nbmem = UST_APP_EVENT_LIST_SIZE; |
871 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
872 | if (!tmp_events) { | |
022d91ba | 873 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
874 | ret = -ENOMEM; |
875 | goto error; | |
876 | } | |
877 | ||
878 | rcu_read_lock(); | |
022d91ba | 879 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
880 | node.node) { |
881 | ssize_t nb_ev; | |
022d91ba | 882 | struct lttng_event *agent_events; |
f20baf8e | 883 | |
f60140a1 DG |
884 | /* Skip domain not asked by the list. */ |
885 | if (app->domain != domain) { | |
886 | continue; | |
887 | } | |
888 | ||
022d91ba | 889 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
890 | if (nb_ev < 0) { |
891 | ret = nb_ev; | |
428de77a | 892 | goto error_unlock; |
f20baf8e DG |
893 | } |
894 | ||
53efb85a | 895 | if (count + nb_ev > nbmem) { |
f20baf8e | 896 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
897 | struct lttng_event *new_tmp_events; |
898 | size_t new_nbmem; | |
899 | ||
900 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 901 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
902 | nbmem, new_nbmem); |
903 | new_tmp_events = realloc(tmp_events, | |
904 | new_nbmem * sizeof(*new_tmp_events)); | |
905 | if (!new_tmp_events) { | |
022d91ba | 906 | PERROR("realloc agent events"); |
f20baf8e | 907 | ret = -ENOMEM; |
022d91ba | 908 | free(agent_events); |
428de77a | 909 | goto error_unlock; |
f20baf8e | 910 | } |
53efb85a MD |
911 | /* Zero the new memory */ |
912 | memset(new_tmp_events + nbmem, 0, | |
913 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
914 | nbmem = new_nbmem; | |
915 | tmp_events = new_tmp_events; | |
f20baf8e | 916 | } |
022d91ba | 917 | memcpy(tmp_events + count, agent_events, |
53efb85a | 918 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 919 | free(agent_events); |
f20baf8e DG |
920 | count += nb_ev; |
921 | } | |
922 | rcu_read_unlock(); | |
923 | ||
924 | ret = count; | |
925 | *events = tmp_events; | |
aae6255e | 926 | return ret; |
f20baf8e | 927 | |
428de77a MD |
928 | error_unlock: |
929 | rcu_read_unlock(); | |
f20baf8e | 930 | error: |
aae6255e | 931 | free(tmp_events); |
f20baf8e DG |
932 | return ret; |
933 | } | |
934 | ||
935 | /* | |
022d91ba | 936 | * Create a agent app object using the given PID. |
f20baf8e DG |
937 | * |
938 | * Return newly allocated object or else NULL on error. | |
939 | */ | |
fefd409b DG |
940 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
941 | struct lttcomm_sock *sock) | |
f20baf8e | 942 | { |
022d91ba | 943 | struct agent_app *app; |
f20baf8e DG |
944 | |
945 | assert(sock); | |
946 | ||
947 | app = zmalloc(sizeof(*app)); | |
948 | if (!app) { | |
022d91ba | 949 | PERROR("zmalloc agent create"); |
f20baf8e DG |
950 | goto error; |
951 | } | |
952 | ||
953 | app->pid = pid; | |
fefd409b | 954 | app->domain = domain; |
f20baf8e | 955 | app->sock = sock; |
f20baf8e DG |
956 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
957 | ||
958 | error: | |
959 | return app; | |
960 | } | |
961 | ||
962 | /* | |
022d91ba | 963 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
964 | * |
965 | * RCU read side lock MUST be acquired. | |
966 | * | |
967 | * Return object if found else NULL. | |
968 | */ | |
022d91ba | 969 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
970 | { |
971 | struct lttng_ht_node_ulong *node; | |
972 | struct lttng_ht_iter iter; | |
022d91ba | 973 | struct agent_app *app; |
f20baf8e DG |
974 | |
975 | assert(sock >= 0); | |
976 | ||
022d91ba | 977 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
978 | node = lttng_ht_iter_get_node_ulong(&iter); |
979 | if (node == NULL) { | |
980 | goto error; | |
981 | } | |
022d91ba | 982 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 983 | |
022d91ba | 984 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
985 | return app; |
986 | ||
987 | error: | |
022d91ba | 988 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
989 | return NULL; |
990 | } | |
991 | ||
992 | /* | |
022d91ba | 993 | * Add agent application object to the global hash table. |
f20baf8e | 994 | */ |
022d91ba | 995 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
996 | { |
997 | assert(app); | |
998 | ||
022d91ba | 999 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
022d91ba | 1000 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
1001 | } |
1002 | ||
f20baf8e | 1003 | /* |
022d91ba | 1004 | * Delete agent application from the global hash table. |
d558f236 JG |
1005 | * |
1006 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 1007 | */ |
022d91ba | 1008 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
1009 | { |
1010 | int ret; | |
1011 | struct lttng_ht_iter iter; | |
1012 | ||
1013 | assert(app); | |
1014 | ||
022d91ba | 1015 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
1016 | |
1017 | iter.iter.node = &app->node.node; | |
022d91ba | 1018 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
1019 | assert(!ret); |
1020 | } | |
1021 | ||
1022 | /* | |
e785906c | 1023 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 1024 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 1025 | * delayed memory reclaim. |
f20baf8e | 1026 | */ |
022d91ba | 1027 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
1028 | { |
1029 | assert(app); | |
1030 | ||
1031 | if (app->sock) { | |
1032 | app->sock->ops->close(app->sock); | |
1033 | lttcomm_destroy_sock(app->sock); | |
1034 | } | |
1035 | ||
022d91ba | 1036 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
1037 | } |
1038 | ||
0475c50c | 1039 | /* |
022d91ba | 1040 | * Initialize an already allocated agent object. |
0475c50c DG |
1041 | * |
1042 | * Return 0 on success or else a negative errno value. | |
1043 | */ | |
022d91ba | 1044 | int agent_init(struct agent *agt) |
0475c50c DG |
1045 | { |
1046 | int ret; | |
1047 | ||
022d91ba | 1048 | assert(agt); |
0475c50c | 1049 | |
022d91ba DG |
1050 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
1051 | if (!agt->events) { | |
0475c50c DG |
1052 | ret = -ENOMEM; |
1053 | goto error; | |
1054 | } | |
fefd409b | 1055 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c | 1056 | |
bdf64013 | 1057 | CDS_INIT_LIST_HEAD(&agt->app_ctx_list); |
0475c50c DG |
1058 | return 0; |
1059 | ||
1060 | error: | |
1061 | return ret; | |
1062 | } | |
1063 | ||
fefd409b DG |
1064 | /* |
1065 | * Add agent object to the given hash table. | |
1066 | */ | |
1067 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
1068 | { | |
1069 | assert(agt); | |
1070 | assert(ht); | |
1071 | ||
1072 | DBG3("Agent adding from domain %d", agt->domain); | |
1073 | ||
fefd409b | 1074 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
1075 | } |
1076 | ||
1077 | /* | |
1078 | * Create an agent object for the given domain. | |
1079 | * | |
1080 | * Return the allocated agent or NULL on error. | |
1081 | */ | |
1082 | struct agent *agent_create(enum lttng_domain_type domain) | |
1083 | { | |
1084 | int ret; | |
1085 | struct agent *agt; | |
1086 | ||
3b5f70d4 | 1087 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
1088 | if (!agt) { |
1089 | goto error; | |
1090 | } | |
1091 | agt->domain = domain; | |
1092 | ||
1093 | ret = agent_init(agt); | |
1094 | if (ret < 0) { | |
1095 | free(agt); | |
988ae332 | 1096 | agt = NULL; |
fefd409b DG |
1097 | goto error; |
1098 | } | |
1099 | ||
1100 | error: | |
1101 | return agt; | |
1102 | } | |
1103 | ||
0475c50c | 1104 | /* |
51755dc8 JG |
1105 | * Create a newly allocated agent event data structure. |
1106 | * Ownership of filter_expression is taken. | |
0475c50c DG |
1107 | * |
1108 | * Return a new object else NULL on error. | |
1109 | */ | |
022d91ba | 1110 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 1111 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
51755dc8 | 1112 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 1113 | { |
51755dc8 | 1114 | struct agent_event *event = NULL; |
0475c50c | 1115 | |
6b10b3b0 AM |
1116 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
1117 | loglevel value %d and filter %s", | |
40111ba1 JG |
1118 | name, loglevel_type, loglevel_value, |
1119 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 1120 | |
51755dc8 JG |
1121 | if (!name) { |
1122 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
1123 | goto error; |
1124 | } | |
1125 | ||
51755dc8 JG |
1126 | event = zmalloc(sizeof(*event)); |
1127 | if (!event) { | |
1128 | goto error; | |
0475c50c DG |
1129 | } |
1130 | ||
51755dc8 JG |
1131 | strncpy(event->name, name, sizeof(event->name)); |
1132 | event->name[sizeof(event->name) - 1] = '\0'; | |
1133 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 1134 | |
2106efa0 | 1135 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
1136 | event->loglevel_type = loglevel_type; |
1137 | event->filter = filter; | |
1138 | event->filter_expression = filter_expression; | |
0475c50c DG |
1139 | error: |
1140 | return event; | |
1141 | } | |
1142 | ||
1143 | /* | |
022d91ba | 1144 | * Unique add of a agent event to an agent object. |
0475c50c | 1145 | */ |
022d91ba | 1146 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
1147 | { |
1148 | assert(event); | |
022d91ba DG |
1149 | assert(agt); |
1150 | assert(agt->events); | |
0475c50c | 1151 | |
022d91ba | 1152 | DBG3("Agent adding event %s", event->name); |
022d91ba | 1153 | add_unique_agent_event(agt->events, event); |
022d91ba | 1154 | agt->being_used = 1; |
0475c50c DG |
1155 | } |
1156 | ||
bdf64013 JG |
1157 | /* |
1158 | * Unique add of a agent context to an agent object. | |
1159 | */ | |
df4f5a87 | 1160 | int agent_add_context(const struct lttng_event_context *ctx, struct agent *agt) |
bdf64013 JG |
1161 | { |
1162 | int ret = LTTNG_OK; | |
1163 | struct agent_app_ctx *agent_ctx = NULL; | |
1164 | ||
1165 | assert(ctx); | |
1166 | assert(agt); | |
1167 | assert(agt->events); | |
1168 | assert(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
1169 | ||
1170 | agent_ctx = create_app_ctx(ctx); | |
1171 | if (!agent_ctx) { | |
1172 | ret = LTTNG_ERR_NOMEM; | |
1173 | goto end; | |
1174 | } | |
1175 | ||
1176 | DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name, | |
1177 | ctx->u.app_ctx.ctx_name); | |
1178 | cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list); | |
1179 | end: | |
1180 | return ret; | |
1181 | } | |
1182 | ||
0475c50c | 1183 | /* |
e261a6cc | 1184 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 1185 | * |
e261a6cc PP |
1186 | * RCU read side lock MUST be acquired. It must be held for the |
1187 | * duration of the iteration. | |
4a4ab2c3 | 1188 | * |
e261a6cc | 1189 | * Sets the given iterator. |
4a4ab2c3 | 1190 | */ |
e261a6cc PP |
1191 | void agent_find_events_by_name(const char *name, struct agent *agt, |
1192 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 1193 | { |
4a4ab2c3 | 1194 | struct lttng_ht *ht; |
022d91ba | 1195 | struct agent_ht_key key; |
4a4ab2c3 DG |
1196 | |
1197 | assert(name); | |
022d91ba DG |
1198 | assert(agt); |
1199 | assert(agt->events); | |
e261a6cc | 1200 | assert(iter); |
4a4ab2c3 | 1201 | |
022d91ba | 1202 | ht = agt->events; |
4a4ab2c3 DG |
1203 | key.name = name; |
1204 | ||
1205 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
1206 | ht_match_event_by_name, &key, &iter->iter); |
1207 | } | |
4a4ab2c3 | 1208 | |
e261a6cc PP |
1209 | /* |
1210 | * Get the next agent event duplicate by name. This should be called | |
1211 | * after a call to agent_find_events_by_name() to iterate on events. | |
1212 | * | |
1213 | * The RCU read lock must be held during the iteration and for as long | |
1214 | * as the object the iterator points to remains in use. | |
1215 | */ | |
1216 | void agent_event_next_duplicate(const char *name, | |
1217 | struct agent *agt, struct lttng_ht_iter* iter) | |
1218 | { | |
1219 | struct agent_ht_key key; | |
4a4ab2c3 | 1220 | |
e261a6cc PP |
1221 | key.name = name; |
1222 | ||
1223 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
1224 | &key, &iter->iter); | |
4a4ab2c3 DG |
1225 | } |
1226 | ||
1227 | /* | |
6b10b3b0 | 1228 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c | 1229 | * |
1e17eae2 JG |
1230 | * RCU read side lock MUST be acquired. It must be kept for as long as |
1231 | * the returned agent_event is used. | |
0475c50c DG |
1232 | * |
1233 | * Return object if found else NULL. | |
1234 | */ | |
a9319624 PP |
1235 | struct agent_event *agent_find_event(const char *name, |
1236 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
6b10b3b0 | 1237 | char *filter_expression, struct agent *agt) |
0475c50c DG |
1238 | { |
1239 | struct lttng_ht_node_str *node; | |
1240 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 1241 | struct lttng_ht *ht; |
022d91ba | 1242 | struct agent_ht_key key; |
0475c50c DG |
1243 | |
1244 | assert(name); | |
022d91ba DG |
1245 | assert(agt); |
1246 | assert(agt->events); | |
0475c50c | 1247 | |
022d91ba | 1248 | ht = agt->events; |
4a4ab2c3 | 1249 | key.name = name; |
2106efa0 | 1250 | key.loglevel_value = loglevel_value; |
a9319624 | 1251 | key.loglevel_type = loglevel_type; |
6b10b3b0 | 1252 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
1253 | |
1254 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1255 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
1256 | node = lttng_ht_iter_get_node_str(&iter); |
1257 | if (node == NULL) { | |
1258 | goto error; | |
1259 | } | |
1260 | ||
022d91ba DG |
1261 | DBG3("Agent event found %s.", name); |
1262 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
1263 | |
1264 | error: | |
a51e817b | 1265 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
1266 | return NULL; |
1267 | } | |
1268 | ||
0475c50c | 1269 | /* |
022d91ba DG |
1270 | * Free given agent event. This event must not be globally visible at this |
1271 | * point (only expected to be used on failure just after event creation). After | |
1272 | * this call, the pointer is not usable anymore. | |
0475c50c | 1273 | */ |
022d91ba | 1274 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
1275 | { |
1276 | assert(event); | |
1277 | ||
971da06a | 1278 | free(event->filter); |
8404118c | 1279 | free(event->filter_expression); |
51755dc8 | 1280 | free(event->exclusion); |
0475c50c DG |
1281 | free(event); |
1282 | } | |
1283 | ||
bdf64013 JG |
1284 | static |
1285 | void destroy_app_ctx_rcu(struct rcu_head *head) | |
1286 | { | |
1287 | struct agent_app_ctx *ctx = | |
1288 | caa_container_of(head, struct agent_app_ctx, rcu_node); | |
1289 | ||
1290 | destroy_app_ctx(ctx); | |
1291 | } | |
1292 | ||
0475c50c | 1293 | /* |
35ed21a5 | 1294 | * Destroy an agent completely. |
0475c50c | 1295 | */ |
022d91ba | 1296 | void agent_destroy(struct agent *agt) |
0475c50c DG |
1297 | { |
1298 | struct lttng_ht_node_str *node; | |
1299 | struct lttng_ht_iter iter; | |
bdf64013 | 1300 | struct agent_app_ctx *ctx; |
0475c50c | 1301 | |
022d91ba | 1302 | assert(agt); |
0475c50c | 1303 | |
022d91ba | 1304 | DBG3("Agent destroy"); |
0475c50c | 1305 | |
0475c50c | 1306 | rcu_read_lock(); |
022d91ba | 1307 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 1308 | int ret; |
022d91ba | 1309 | struct agent_event *event; |
29c0fd4d DG |
1310 | |
1311 | /* | |
bdf64013 JG |
1312 | * When destroying an event, we have to try to disable it on the |
1313 | * agent side so the event stops generating data. The return | |
1314 | * value is not important since we have to continue anyway | |
1315 | * destroying the object. | |
29c0fd4d | 1316 | */ |
022d91ba DG |
1317 | event = caa_container_of(node, struct agent_event, node); |
1318 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1319 | |
022d91ba | 1320 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1321 | assert(!ret); |
022d91ba | 1322 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c | 1323 | } |
0475c50c | 1324 | |
bdf64013 JG |
1325 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
1326 | (void) disable_context(ctx, agt->domain); | |
1327 | cds_list_del(&ctx->list_node); | |
1328 | call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); | |
1329 | } | |
1330 | rcu_read_unlock(); | |
f8be902b | 1331 | ht_cleanup_push(agt->events); |
35ed21a5 | 1332 | free(agt); |
f20baf8e DG |
1333 | } |
1334 | ||
1335 | /* | |
6a4e4039 | 1336 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1337 | */ |
6a4e4039 | 1338 | int agent_app_ht_alloc(void) |
f20baf8e | 1339 | { |
6a4e4039 JG |
1340 | int ret = 0; |
1341 | ||
022d91ba DG |
1342 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1343 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1344 | ret = -1; |
f20baf8e DG |
1345 | } |
1346 | ||
6a4e4039 JG |
1347 | return ret; |
1348 | } | |
1349 | ||
1350 | /* | |
1351 | * Destroy a agent application by socket. | |
1352 | */ | |
1353 | void agent_destroy_app_by_sock(int sock) | |
1354 | { | |
1355 | struct agent_app *app; | |
1356 | ||
1357 | assert(sock >= 0); | |
1358 | ||
1359 | /* | |
1360 | * Not finding an application is a very important error that should NEVER | |
1361 | * happen. The hash table deletion is ONLY done through this call when the | |
1362 | * main sessiond thread is torn down. | |
1363 | */ | |
1364 | rcu_read_lock(); | |
1365 | app = agent_find_app_by_sock(sock); | |
1366 | assert(app); | |
1367 | ||
1368 | /* RCU read side lock is assumed to be held by this function. */ | |
1369 | agent_delete_app(app); | |
1370 | ||
1371 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1372 | agent_destroy_app(app); | |
1373 | rcu_read_unlock(); | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Clean-up the agent app hash table and destroy it. | |
1378 | */ | |
1379 | void agent_app_ht_clean(void) | |
1380 | { | |
1381 | struct lttng_ht_node_ulong *node; | |
1382 | struct lttng_ht_iter iter; | |
1383 | ||
a433283e JG |
1384 | if (!agent_apps_ht_by_sock) { |
1385 | return; | |
1386 | } | |
6a4e4039 JG |
1387 | rcu_read_lock(); |
1388 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1389 | struct agent_app *app; | |
1390 | ||
1391 | app = caa_container_of(node, struct agent_app, node); | |
1392 | agent_destroy_app_by_sock(app->sock->fd); | |
1393 | } | |
1394 | rcu_read_unlock(); | |
1395 | ||
1396 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1397 | } |
1398 | ||
1399 | /* | |
022d91ba | 1400 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1401 | * |
1402 | * Note that this function is most likely to be used with a tracing session | |
1403 | * thus the caller should make sure to hold the appropriate lock(s). | |
1404 | */ | |
022d91ba | 1405 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1406 | { |
1407 | int ret; | |
022d91ba DG |
1408 | struct agent_app *app; |
1409 | struct agent_event *event; | |
f20baf8e | 1410 | struct lttng_ht_iter iter; |
bdf64013 | 1411 | struct agent_app_ctx *ctx; |
f20baf8e | 1412 | |
022d91ba | 1413 | assert(agt); |
f20baf8e DG |
1414 | assert(sock >= 0); |
1415 | ||
022d91ba | 1416 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1417 | |
1418 | rcu_read_lock(); | |
bdf64013 JG |
1419 | app = agent_find_app_by_sock(sock); |
1420 | /* | |
1421 | * We are in the registration path thus if the application is gone, | |
1422 | * there is a serious code flow error. | |
1423 | */ | |
1424 | assert(app); | |
022d91ba | 1425 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1426 | /* Skip event if disabled. */ |
1427 | if (!event->enabled) { | |
1428 | continue; | |
1429 | } | |
1430 | ||
f20baf8e DG |
1431 | ret = enable_event(app, event); |
1432 | if (ret != LTTNG_OK) { | |
022d91ba | 1433 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1434 | event->name, app->pid, app->sock->fd); |
1435 | /* Let's try the others here and don't assume the app is dead. */ | |
1436 | continue; | |
1437 | } | |
1438 | } | |
bdf64013 JG |
1439 | |
1440 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { | |
1441 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); | |
1442 | if (ret != LTTNG_OK) { | |
1443 | DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", | |
1444 | ctx->provider_name, ctx->ctx_name, | |
1445 | app->pid, app->sock->fd); | |
1446 | continue; | |
1447 | } | |
1448 | } | |
1449 | ||
f20baf8e | 1450 | rcu_read_unlock(); |
0475c50c | 1451 | } |