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917a718d JG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #include <stddef.h> | |
21 | #include <pthread.h> | |
22 | #include <signal.h> | |
23 | #include <sys/stat.h> | |
24 | #include <common/compat/getenv.h> | |
25 | #include <common/unix.h> | |
26 | #include <common/utils.h> | |
27 | #include <lttng/userspace-probe-internal.h> | |
28 | #include <lttng/event-internal.h> | |
29 | ||
30 | #include "client.h" | |
31 | #include "lttng-sessiond.h" | |
32 | #include "cmd.h" | |
33 | #include "kernel.h" | |
34 | #include "save.h" | |
35 | #include "health-sessiond.h" | |
36 | #include "testpoint.h" | |
37 | #include "utils.h" | |
4ec029ed | 38 | #include "manage-consumer.h" |
818ea544 | 39 | #include "clear.h" |
917a718d JG |
40 | |
41 | static bool is_root; | |
42 | ||
43 | static struct thread_state { | |
6cb45e93 JG |
44 | sem_t ready; |
45 | bool running; | |
46 | } thread_state; | |
47 | ||
48 | static void set_thread_status(bool running) | |
917a718d | 49 | { |
6cb45e93 JG |
50 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
51 | thread_state.running = running; | |
52 | sem_post(&thread_state.ready); | |
917a718d JG |
53 | } |
54 | ||
6cb45e93 | 55 | static bool wait_thread_status(void) |
917a718d | 56 | { |
6cb45e93 JG |
57 | DBG("Waiting for client thread to be ready"); |
58 | sem_wait(&thread_state.ready); | |
59 | if (thread_state.running) { | |
60 | DBG("Client thread is ready"); | |
61 | } else { | |
62 | ERR("Initialization of client thread failed"); | |
917a718d | 63 | } |
6cb45e93 JG |
64 | |
65 | return thread_state.running; | |
917a718d JG |
66 | } |
67 | ||
68 | /* | |
69 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
70 | * right amount of memory and copying the original information from the lsm | |
71 | * structure. | |
72 | * | |
73 | * Return 0 on success, negative value on error. | |
74 | */ | |
75 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
76 | const void *payload_buf, size_t payload_len, | |
77 | const void *cmd_header_buf, size_t cmd_header_len) | |
78 | { | |
79 | int ret = 0; | |
80 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
81 | const size_t cmd_header_offset = header_len; | |
82 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
83 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
84 | ||
85 | cmd_ctx->llm = zmalloc(total_msg_size); | |
86 | ||
87 | if (cmd_ctx->llm == NULL) { | |
88 | PERROR("zmalloc"); | |
89 | ret = -ENOMEM; | |
90 | goto end; | |
91 | } | |
92 | ||
93 | /* Copy common data */ | |
94 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
95 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; | |
96 | cmd_ctx->llm->cmd_header_size = cmd_header_len; | |
97 | cmd_ctx->llm->data_size = payload_len; | |
98 | cmd_ctx->lttng_msg_size = total_msg_size; | |
99 | ||
100 | /* Copy command header */ | |
101 | if (cmd_header_len) { | |
102 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
103 | cmd_header_len); | |
104 | } | |
105 | ||
106 | /* Copy payload */ | |
107 | if (payload_len) { | |
108 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
109 | payload_len); | |
110 | } | |
111 | ||
112 | end: | |
113 | return ret; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 118 | * exec or it will fail. |
917a718d JG |
119 | */ |
120 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
121 | { | |
4ec029ed | 122 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
123 | } |
124 | ||
125 | /* | |
126 | * Fork and exec a consumer daemon (consumerd). | |
127 | * | |
128 | * Return pid if successful else -1. | |
129 | */ | |
130 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
131 | { | |
132 | int ret; | |
133 | pid_t pid; | |
134 | const char *consumer_to_use; | |
135 | const char *verbosity; | |
136 | struct stat st; | |
137 | ||
138 | DBG("Spawning consumerd"); | |
139 | ||
140 | pid = fork(); | |
141 | if (pid == 0) { | |
142 | /* | |
143 | * Exec consumerd. | |
144 | */ | |
145 | if (config.verbose_consumer) { | |
146 | verbosity = "--verbose"; | |
147 | } else if (lttng_opt_quiet) { | |
148 | verbosity = "--quiet"; | |
149 | } else { | |
150 | verbosity = ""; | |
151 | } | |
152 | ||
153 | switch (consumer_data->type) { | |
154 | case LTTNG_CONSUMER_KERNEL: | |
155 | /* | |
156 | * Find out which consumerd to execute. We will first try the | |
157 | * 64-bit path, then the sessiond's installation directory, and | |
158 | * fallback on the 32-bit one, | |
159 | */ | |
160 | DBG3("Looking for a kernel consumer at these locations:"); | |
161 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); | |
162 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); | |
163 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); | |
164 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { | |
165 | DBG3("Found location #1"); | |
166 | consumer_to_use = config.consumerd64_bin_path.value; | |
167 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
168 | DBG3("Found location #2"); | |
169 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
170 | } else if (config.consumerd32_bin_path.value && | |
171 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
172 | DBG3("Found location #3"); | |
173 | consumer_to_use = config.consumerd32_bin_path.value; | |
174 | } else { | |
175 | DBG("Could not find any valid consumerd executable"); | |
176 | ret = -EINVAL; | |
177 | goto error; | |
178 | } | |
179 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
180 | (void) execl(consumer_to_use, | |
181 | "lttng-consumerd", verbosity, "-k", | |
182 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
183 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
184 | "--group", config.tracing_group_name.value, | |
185 | NULL); | |
186 | break; | |
187 | case LTTNG_CONSUMER64_UST: | |
188 | { | |
189 | if (config.consumerd64_lib_dir.value) { | |
190 | char *tmp; | |
191 | size_t tmplen; | |
192 | char *tmpnew; | |
193 | ||
194 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
195 | if (!tmp) { | |
196 | tmp = ""; | |
197 | } | |
198 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
199 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
200 | if (!tmpnew) { | |
201 | ret = -ENOMEM; | |
202 | goto error; | |
203 | } | |
204 | strcat(tmpnew, config.consumerd64_lib_dir.value); | |
205 | if (tmp[0] != '\0') { | |
206 | strcat(tmpnew, ":"); | |
207 | strcat(tmpnew, tmp); | |
208 | } | |
209 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
210 | free(tmpnew); | |
211 | if (ret) { | |
212 | ret = -errno; | |
213 | goto error; | |
214 | } | |
215 | } | |
216 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); | |
217 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
218 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
219 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
220 | "--group", config.tracing_group_name.value, | |
221 | NULL); | |
222 | break; | |
223 | } | |
224 | case LTTNG_CONSUMER32_UST: | |
225 | { | |
226 | if (config.consumerd32_lib_dir.value) { | |
227 | char *tmp; | |
228 | size_t tmplen; | |
229 | char *tmpnew; | |
230 | ||
231 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
232 | if (!tmp) { | |
233 | tmp = ""; | |
234 | } | |
235 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
236 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
237 | if (!tmpnew) { | |
238 | ret = -ENOMEM; | |
239 | goto error; | |
240 | } | |
241 | strcat(tmpnew, config.consumerd32_lib_dir.value); | |
242 | if (tmp[0] != '\0') { | |
243 | strcat(tmpnew, ":"); | |
244 | strcat(tmpnew, tmp); | |
245 | } | |
246 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
247 | free(tmpnew); | |
248 | if (ret) { | |
249 | ret = -errno; | |
250 | goto error; | |
251 | } | |
252 | } | |
253 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); | |
254 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
255 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
256 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
257 | "--group", config.tracing_group_name.value, | |
258 | NULL); | |
259 | break; | |
260 | } | |
261 | default: | |
262 | ERR("unknown consumer type"); | |
263 | errno = 0; | |
264 | } | |
265 | if (errno != 0) { | |
266 | PERROR("Consumer execl()"); | |
267 | } | |
268 | /* Reaching this point, we got a failure on our execl(). */ | |
269 | exit(EXIT_FAILURE); | |
270 | } else if (pid > 0) { | |
271 | ret = pid; | |
272 | } else { | |
273 | PERROR("start consumer fork"); | |
274 | ret = -errno; | |
275 | } | |
276 | error: | |
277 | return ret; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Spawn the consumerd daemon and session daemon thread. | |
282 | */ | |
283 | static int start_consumerd(struct consumer_data *consumer_data) | |
284 | { | |
285 | int ret; | |
286 | ||
287 | /* | |
288 | * Set the listen() state on the socket since there is a possible race | |
289 | * between the exec() of the consumer daemon and this call if place in the | |
290 | * consumer thread. See bug #366 for more details. | |
291 | */ | |
292 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
293 | if (ret < 0) { | |
294 | goto error; | |
295 | } | |
296 | ||
297 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
298 | if (consumer_data->pid != 0) { | |
299 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
300 | goto end; | |
301 | } | |
302 | ||
303 | ret = spawn_consumerd(consumer_data); | |
304 | if (ret < 0) { | |
305 | ERR("Spawning consumerd failed"); | |
306 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
307 | goto error; | |
308 | } | |
309 | ||
310 | /* Setting up the consumer_data pid */ | |
311 | consumer_data->pid = ret; | |
312 | DBG2("Consumer pid %d", consumer_data->pid); | |
313 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
314 | ||
315 | DBG2("Spawning consumer control thread"); | |
316 | ret = spawn_consumer_thread(consumer_data); | |
317 | if (ret < 0) { | |
318 | ERR("Fatal error spawning consumer control thread"); | |
319 | goto error; | |
320 | } | |
321 | ||
322 | end: | |
323 | return 0; | |
324 | ||
325 | error: | |
326 | /* Cleanup already created sockets on error. */ | |
327 | if (consumer_data->err_sock >= 0) { | |
328 | int err; | |
329 | ||
330 | err = close(consumer_data->err_sock); | |
331 | if (err < 0) { | |
332 | PERROR("close consumer data error socket"); | |
333 | } | |
334 | } | |
335 | return ret; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Copy consumer output from the tracing session to the domain session. The | |
340 | * function also applies the right modification on a per domain basis for the | |
341 | * trace files destination directory. | |
342 | * | |
343 | * Should *NOT* be called with RCU read-side lock held. | |
344 | */ | |
345 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
346 | { | |
347 | int ret; | |
348 | const char *dir_name; | |
349 | struct consumer_output *consumer; | |
350 | ||
351 | assert(session); | |
352 | assert(session->consumer); | |
353 | ||
354 | switch (domain) { | |
355 | case LTTNG_DOMAIN_KERNEL: | |
356 | DBG3("Copying tracing session consumer output in kernel session"); | |
357 | /* | |
358 | * XXX: We should audit the session creation and what this function | |
359 | * does "extra" in order to avoid a destroy since this function is used | |
360 | * in the domain session creation (kernel and ust) only. Same for UST | |
361 | * domain. | |
362 | */ | |
363 | if (session->kernel_session->consumer) { | |
364 | consumer_output_put(session->kernel_session->consumer); | |
365 | } | |
366 | session->kernel_session->consumer = | |
367 | consumer_copy_output(session->consumer); | |
368 | /* Ease our life a bit for the next part */ | |
369 | consumer = session->kernel_session->consumer; | |
370 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
371 | break; | |
372 | case LTTNG_DOMAIN_JUL: | |
373 | case LTTNG_DOMAIN_LOG4J: | |
374 | case LTTNG_DOMAIN_PYTHON: | |
375 | case LTTNG_DOMAIN_UST: | |
376 | DBG3("Copying tracing session consumer output in UST session"); | |
377 | if (session->ust_session->consumer) { | |
378 | consumer_output_put(session->ust_session->consumer); | |
379 | } | |
380 | session->ust_session->consumer = | |
381 | consumer_copy_output(session->consumer); | |
382 | /* Ease our life a bit for the next part */ | |
383 | consumer = session->ust_session->consumer; | |
384 | dir_name = DEFAULT_UST_TRACE_DIR; | |
385 | break; | |
386 | default: | |
387 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
388 | goto error; | |
389 | } | |
390 | ||
391 | /* Append correct directory to subdir */ | |
392 | strncat(consumer->subdir, dir_name, | |
393 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
394 | DBG3("Copy session consumer subdir %s", consumer->subdir); | |
395 | ||
396 | ret = LTTNG_OK; | |
397 | ||
398 | error: | |
399 | return ret; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Create an UST session and add it to the session ust list. | |
404 | * | |
405 | * Should *NOT* be called with RCU read-side lock held. | |
406 | */ | |
407 | static int create_ust_session(struct ltt_session *session, | |
408 | struct lttng_domain *domain) | |
409 | { | |
410 | int ret; | |
411 | struct ltt_ust_session *lus = NULL; | |
412 | ||
413 | assert(session); | |
414 | assert(domain); | |
415 | assert(session->consumer); | |
416 | ||
417 | switch (domain->type) { | |
418 | case LTTNG_DOMAIN_JUL: | |
419 | case LTTNG_DOMAIN_LOG4J: | |
420 | case LTTNG_DOMAIN_PYTHON: | |
421 | case LTTNG_DOMAIN_UST: | |
422 | break; | |
423 | default: | |
424 | ERR("Unknown UST domain on create session %d", domain->type); | |
425 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
426 | goto error; | |
427 | } | |
428 | ||
429 | DBG("Creating UST session"); | |
430 | ||
431 | lus = trace_ust_create_session(session->id); | |
432 | if (lus == NULL) { | |
433 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
434 | goto error; | |
435 | } | |
436 | ||
437 | lus->uid = session->uid; | |
438 | lus->gid = session->gid; | |
439 | lus->output_traces = session->output_traces; | |
440 | lus->snapshot_mode = session->snapshot_mode; | |
441 | lus->live_timer_interval = session->live_timer; | |
442 | session->ust_session = lus; | |
443 | if (session->shm_path[0]) { | |
444 | strncpy(lus->root_shm_path, session->shm_path, | |
445 | sizeof(lus->root_shm_path)); | |
446 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
447 | strncpy(lus->shm_path, session->shm_path, | |
448 | sizeof(lus->shm_path)); | |
449 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
450 | strncat(lus->shm_path, "/ust", | |
451 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
452 | } | |
453 | /* Copy session output to the newly created UST session */ | |
454 | ret = copy_session_consumer(domain->type, session); | |
455 | if (ret != LTTNG_OK) { | |
456 | goto error; | |
457 | } | |
458 | ||
459 | return LTTNG_OK; | |
460 | ||
461 | error: | |
462 | free(lus); | |
463 | session->ust_session = NULL; | |
464 | return ret; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Create a kernel tracer session then create the default channel. | |
469 | */ | |
470 | static int create_kernel_session(struct ltt_session *session) | |
471 | { | |
472 | int ret; | |
473 | ||
474 | DBG("Creating kernel session"); | |
475 | ||
476 | ret = kernel_create_session(session, kernel_tracer_fd); | |
477 | if (ret < 0) { | |
478 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 479 | goto error_create; |
917a718d JG |
480 | } |
481 | ||
482 | /* Code flow safety */ | |
483 | assert(session->kernel_session); | |
484 | ||
485 | /* Copy session output to the newly created Kernel session */ | |
486 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
487 | if (ret != LTTNG_OK) { | |
488 | goto error; | |
489 | } | |
490 | ||
491 | session->kernel_session->uid = session->uid; | |
492 | session->kernel_session->gid = session->gid; | |
493 | session->kernel_session->output_traces = session->output_traces; | |
494 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
495 | ||
496 | return LTTNG_OK; | |
497 | ||
498 | error: | |
499 | trace_kernel_destroy_session(session->kernel_session); | |
500 | session->kernel_session = NULL; | |
5d0a7bcb | 501 | error_create: |
917a718d JG |
502 | return ret; |
503 | } | |
504 | ||
505 | /* | |
506 | * Count number of session permitted by uid/gid. | |
507 | */ | |
508 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
509 | { | |
510 | unsigned int i = 0; | |
511 | struct ltt_session *session; | |
512 | const struct ltt_session_list *session_list = session_get_list(); | |
513 | ||
514 | DBG("Counting number of available session for UID %d GID %d", | |
515 | uid, gid); | |
516 | cds_list_for_each_entry(session, &session_list->head, list) { | |
517 | if (!session_get(session)) { | |
518 | continue; | |
519 | } | |
520 | session_lock(session); | |
521 | /* Only count the sessions the user can control. */ | |
522 | if (session_access_ok(session, uid, gid) && | |
523 | !session->destroyed) { | |
524 | i++; | |
525 | } | |
526 | session_unlock(session); | |
527 | session_put(session); | |
528 | } | |
529 | return i; | |
530 | } | |
531 | ||
532 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
533 | int *sock_error, struct lttng_event *event) | |
534 | { | |
535 | int fd, ret; | |
536 | struct lttng_userspace_probe_location *probe_location; | |
537 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; | |
538 | struct lttng_dynamic_buffer probe_location_buffer; | |
539 | struct lttng_buffer_view buffer_view; | |
540 | ||
541 | /* | |
542 | * Create a buffer to store the serialized version of the probe | |
543 | * location. | |
544 | */ | |
545 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
546 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
547 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
548 | if (ret) { | |
549 | ret = LTTNG_ERR_NOMEM; | |
550 | goto error; | |
551 | } | |
552 | ||
553 | /* | |
554 | * Receive the probe location. | |
555 | */ | |
556 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
557 | probe_location_buffer.size); | |
558 | if (ret <= 0) { | |
559 | DBG("Nothing recv() from client var len data... continuing"); | |
560 | *sock_error = 1; | |
561 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
562 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
563 | goto error; | |
564 | } | |
565 | ||
566 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
567 | &probe_location_buffer, 0, probe_location_buffer.size); | |
568 | ||
569 | /* | |
570 | * Extract the probe location from the serialized version. | |
571 | */ | |
572 | ret = lttng_userspace_probe_location_create_from_buffer( | |
573 | &buffer_view, &probe_location); | |
574 | if (ret < 0) { | |
575 | WARN("Failed to create a userspace probe location from the received buffer"); | |
576 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
577 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
578 | goto error; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Receive the file descriptor to the target binary from the client. | |
583 | */ | |
584 | DBG("Receiving userspace probe target FD from client ..."); | |
585 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
586 | if (ret <= 0) { | |
587 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
588 | *sock_error = 1; | |
589 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
590 | goto error; | |
591 | } | |
592 | ||
593 | /* | |
594 | * Set the file descriptor received from the client through the unix | |
595 | * socket in the probe location. | |
596 | */ | |
597 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
598 | if (!lookup) { | |
599 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
600 | goto error; | |
601 | } | |
602 | ||
603 | /* | |
604 | * From the kernel tracer's perspective, all userspace probe event types | |
605 | * are all the same: a file and an offset. | |
606 | */ | |
607 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
608 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
609 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
610 | probe_location, fd); | |
611 | break; | |
612 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
613 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
614 | probe_location, fd); | |
615 | break; | |
616 | default: | |
617 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
618 | goto error; | |
619 | } | |
620 | ||
621 | if (ret) { | |
622 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
623 | goto error; | |
624 | } | |
625 | ||
626 | /* Attach the probe location to the event. */ | |
627 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
628 | if (ret) { | |
629 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
630 | goto error; | |
631 | } | |
632 | ||
633 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
634 | error: | |
635 | return ret; | |
636 | } | |
637 | ||
917a718d JG |
638 | /* |
639 | * Version of setup_lttng_msg() without command header. | |
640 | */ | |
641 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
642 | void *payload_buf, size_t payload_len) | |
643 | { | |
644 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
645 | } | |
646 | ||
647 | /* | |
648 | * Free memory of a command context structure. | |
649 | */ | |
650 | static void clean_command_ctx(struct command_ctx **cmd_ctx) | |
651 | { | |
652 | DBG("Clean command context structure"); | |
653 | if (*cmd_ctx) { | |
654 | if ((*cmd_ctx)->llm) { | |
655 | free((*cmd_ctx)->llm); | |
656 | } | |
657 | if ((*cmd_ctx)->lsm) { | |
658 | free((*cmd_ctx)->lsm); | |
659 | } | |
660 | free(*cmd_ctx); | |
661 | *cmd_ctx = NULL; | |
662 | } | |
663 | } | |
664 | ||
665 | /* | |
666 | * Check if the current kernel tracer supports the session rotation feature. | |
667 | * Return 1 if it does, 0 otherwise. | |
668 | */ | |
669 | static int check_rotate_compatible(void) | |
670 | { | |
671 | int ret = 1; | |
672 | ||
673 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
674 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
675 | ret = 0; | |
676 | } | |
677 | ||
678 | return ret; | |
679 | } | |
680 | ||
681 | /* | |
682 | * Send data on a unix socket using the liblttsessiondcomm API. | |
683 | * | |
684 | * Return lttcomm error code. | |
685 | */ | |
686 | static int send_unix_sock(int sock, void *buf, size_t len) | |
687 | { | |
688 | /* Check valid length */ | |
689 | if (len == 0) { | |
690 | return -1; | |
691 | } | |
692 | ||
693 | return lttcomm_send_unix_sock(sock, buf, len); | |
694 | } | |
695 | ||
696 | /* | |
697 | * Process the command requested by the lttng client within the command | |
698 | * context structure. This function make sure that the return structure (llm) | |
699 | * is set and ready for transmission before returning. | |
700 | * | |
701 | * Return any error encountered or 0 for success. | |
702 | * | |
703 | * "sock" is only used for special-case var. len data. | |
704 | * | |
705 | * Should *NOT* be called with RCU read-side lock held. | |
706 | */ | |
707 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, | |
708 | int *sock_error) | |
709 | { | |
710 | int ret = LTTNG_OK; | |
711 | int need_tracing_session = 1; | |
712 | int need_domain; | |
713 | ||
714 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
715 | ||
716 | assert(!rcu_read_ongoing()); | |
717 | ||
718 | *sock_error = 0; | |
719 | ||
720 | switch (cmd_ctx->lsm->cmd_type) { | |
721 | case LTTNG_CREATE_SESSION: | |
722 | case LTTNG_CREATE_SESSION_SNAPSHOT: | |
723 | case LTTNG_CREATE_SESSION_LIVE: | |
724 | case LTTNG_DESTROY_SESSION: | |
725 | case LTTNG_LIST_SESSIONS: | |
726 | case LTTNG_LIST_DOMAINS: | |
727 | case LTTNG_START_TRACE: | |
728 | case LTTNG_STOP_TRACE: | |
729 | case LTTNG_DATA_PENDING: | |
730 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
731 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
732 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
733 | case LTTNG_SNAPSHOT_RECORD: | |
734 | case LTTNG_SAVE_SESSION: | |
735 | case LTTNG_SET_SESSION_SHM_PATH: | |
736 | case LTTNG_REGENERATE_METADATA: | |
737 | case LTTNG_REGENERATE_STATEDUMP: | |
738 | case LTTNG_REGISTER_TRIGGER: | |
739 | case LTTNG_UNREGISTER_TRIGGER: | |
740 | case LTTNG_ROTATE_SESSION: | |
741 | case LTTNG_ROTATION_GET_INFO: | |
742 | case LTTNG_ROTATION_SET_SCHEDULE: | |
743 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
818ea544 | 744 | case LTTNG_CLEAR_SESSION: |
917a718d JG |
745 | need_domain = 0; |
746 | break; | |
747 | default: | |
748 | need_domain = 1; | |
749 | } | |
750 | ||
751 | if (config.no_kernel && need_domain | |
752 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
753 | if (!is_root) { | |
754 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
755 | } else { | |
756 | ret = LTTNG_ERR_KERN_NA; | |
757 | } | |
758 | goto error; | |
759 | } | |
760 | ||
761 | /* Deny register consumer if we already have a spawned consumer. */ | |
762 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
763 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
764 | if (kconsumer_data.pid > 0) { | |
765 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
766 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
767 | goto error; | |
768 | } | |
769 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
770 | } | |
771 | ||
772 | /* | |
773 | * Check for command that don't needs to allocate a returned payload. We do | |
774 | * this here so we don't have to make the call for no payload at each | |
775 | * command. | |
776 | */ | |
777 | switch(cmd_ctx->lsm->cmd_type) { | |
778 | case LTTNG_LIST_SESSIONS: | |
779 | case LTTNG_LIST_TRACEPOINTS: | |
780 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
781 | case LTTNG_LIST_DOMAINS: | |
782 | case LTTNG_LIST_CHANNELS: | |
783 | case LTTNG_LIST_EVENTS: | |
784 | case LTTNG_LIST_SYSCALLS: | |
785 | case LTTNG_LIST_TRACKER_PIDS: | |
786 | case LTTNG_DATA_PENDING: | |
787 | case LTTNG_ROTATE_SESSION: | |
788 | case LTTNG_ROTATION_GET_INFO: | |
789 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
790 | break; | |
791 | default: | |
792 | /* Setup lttng message with no payload */ | |
793 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
794 | if (ret < 0) { | |
795 | /* This label does not try to unlock the session */ | |
796 | goto init_setup_error; | |
797 | } | |
798 | } | |
799 | ||
800 | /* Commands that DO NOT need a session. */ | |
801 | switch (cmd_ctx->lsm->cmd_type) { | |
802 | case LTTNG_CREATE_SESSION: | |
803 | case LTTNG_CREATE_SESSION_SNAPSHOT: | |
804 | case LTTNG_CREATE_SESSION_LIVE: | |
805 | case LTTNG_LIST_SESSIONS: | |
806 | case LTTNG_LIST_TRACEPOINTS: | |
807 | case LTTNG_LIST_SYSCALLS: | |
808 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
809 | case LTTNG_SAVE_SESSION: | |
810 | case LTTNG_REGISTER_TRIGGER: | |
811 | case LTTNG_UNREGISTER_TRIGGER: | |
812 | need_tracing_session = 0; | |
813 | break; | |
814 | default: | |
815 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
816 | /* | |
817 | * We keep the session list lock across _all_ commands | |
818 | * for now, because the per-session lock does not | |
819 | * handle teardown properly. | |
820 | */ | |
821 | session_lock_list(); | |
822 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
823 | if (cmd_ctx->session == NULL) { | |
824 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
825 | goto error; | |
826 | } else { | |
827 | /* Acquire lock for the session */ | |
828 | session_lock(cmd_ctx->session); | |
829 | } | |
830 | break; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Commands that need a valid session but should NOT create one if none | |
835 | * exists. Instead of creating one and destroying it when the command is | |
836 | * handled, process that right before so we save some round trip in useless | |
837 | * code path. | |
838 | */ | |
839 | switch (cmd_ctx->lsm->cmd_type) { | |
840 | case LTTNG_DISABLE_CHANNEL: | |
841 | case LTTNG_DISABLE_EVENT: | |
842 | switch (cmd_ctx->lsm->domain.type) { | |
843 | case LTTNG_DOMAIN_KERNEL: | |
844 | if (!cmd_ctx->session->kernel_session) { | |
845 | ret = LTTNG_ERR_NO_CHANNEL; | |
846 | goto error; | |
847 | } | |
848 | break; | |
849 | case LTTNG_DOMAIN_JUL: | |
850 | case LTTNG_DOMAIN_LOG4J: | |
851 | case LTTNG_DOMAIN_PYTHON: | |
852 | case LTTNG_DOMAIN_UST: | |
853 | if (!cmd_ctx->session->ust_session) { | |
854 | ret = LTTNG_ERR_NO_CHANNEL; | |
855 | goto error; | |
856 | } | |
857 | break; | |
858 | default: | |
859 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
860 | goto error; | |
861 | } | |
862 | default: | |
863 | break; | |
864 | } | |
865 | ||
866 | if (!need_domain) { | |
867 | goto skip_domain; | |
868 | } | |
869 | ||
870 | /* | |
871 | * Check domain type for specific "pre-action". | |
872 | */ | |
873 | switch (cmd_ctx->lsm->domain.type) { | |
874 | case LTTNG_DOMAIN_KERNEL: | |
875 | if (!is_root) { | |
876 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
877 | goto error; | |
878 | } | |
879 | ||
880 | /* Consumer is in an ERROR state. Report back to client */ | |
881 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
882 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
883 | goto error; | |
884 | } | |
885 | ||
886 | /* Need a session for kernel command */ | |
887 | if (need_tracing_session) { | |
888 | if (cmd_ctx->session->kernel_session == NULL) { | |
889 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 890 | if (ret != LTTNG_OK) { |
917a718d JG |
891 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
892 | goto error; | |
893 | } | |
894 | } | |
895 | ||
896 | /* Start the kernel consumer daemon */ | |
897 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
898 | if (kconsumer_data.pid == 0 && | |
899 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
900 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
901 | ret = start_consumerd(&kconsumer_data); | |
902 | if (ret < 0) { | |
903 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
904 | goto error; | |
905 | } | |
906 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); | |
907 | } else { | |
908 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
909 | } | |
910 | ||
911 | /* | |
912 | * The consumer was just spawned so we need to add the socket to | |
913 | * the consumer output of the session if exist. | |
914 | */ | |
915 | ret = consumer_create_socket(&kconsumer_data, | |
916 | cmd_ctx->session->kernel_session->consumer); | |
917 | if (ret < 0) { | |
918 | goto error; | |
919 | } | |
920 | } | |
921 | ||
922 | break; | |
923 | case LTTNG_DOMAIN_JUL: | |
924 | case LTTNG_DOMAIN_LOG4J: | |
925 | case LTTNG_DOMAIN_PYTHON: | |
926 | case LTTNG_DOMAIN_UST: | |
927 | { | |
928 | if (!ust_app_supported()) { | |
929 | ret = LTTNG_ERR_NO_UST; | |
930 | goto error; | |
931 | } | |
932 | /* Consumer is in an ERROR state. Report back to client */ | |
933 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
934 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
935 | goto error; | |
936 | } | |
937 | ||
938 | if (need_tracing_session) { | |
939 | /* Create UST session if none exist. */ | |
940 | if (cmd_ctx->session->ust_session == NULL) { | |
941 | ret = create_ust_session(cmd_ctx->session, | |
942 | &cmd_ctx->lsm->domain); | |
943 | if (ret != LTTNG_OK) { | |
944 | goto error; | |
945 | } | |
946 | } | |
947 | ||
948 | /* Start the UST consumer daemons */ | |
949 | /* 64-bit */ | |
950 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
951 | if (config.consumerd64_bin_path.value && | |
952 | ustconsumer64_data.pid == 0 && | |
953 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
954 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
955 | ret = start_consumerd(&ustconsumer64_data); | |
956 | if (ret < 0) { | |
957 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
958 | uatomic_set(&ust_consumerd64_fd, -EINVAL); | |
959 | goto error; | |
960 | } | |
961 | ||
962 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); | |
963 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
964 | } else { | |
965 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
966 | } | |
967 | ||
968 | /* | |
969 | * Setup socket for consumer 64 bit. No need for atomic access | |
970 | * since it was set above and can ONLY be set in this thread. | |
971 | */ | |
972 | ret = consumer_create_socket(&ustconsumer64_data, | |
973 | cmd_ctx->session->ust_session->consumer); | |
974 | if (ret < 0) { | |
975 | goto error; | |
976 | } | |
977 | ||
978 | /* 32-bit */ | |
979 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); | |
980 | if (config.consumerd32_bin_path.value && | |
981 | ustconsumer32_data.pid == 0 && | |
982 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
983 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
984 | ret = start_consumerd(&ustconsumer32_data); | |
985 | if (ret < 0) { | |
986 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
987 | uatomic_set(&ust_consumerd32_fd, -EINVAL); | |
988 | goto error; | |
989 | } | |
990 | ||
991 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); | |
992 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
993 | } else { | |
994 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
995 | } | |
996 | ||
997 | /* | |
998 | * Setup socket for consumer 32 bit. No need for atomic access | |
999 | * since it was set above and can ONLY be set in this thread. | |
1000 | */ | |
1001 | ret = consumer_create_socket(&ustconsumer32_data, | |
1002 | cmd_ctx->session->ust_session->consumer); | |
1003 | if (ret < 0) { | |
1004 | goto error; | |
1005 | } | |
1006 | } | |
1007 | break; | |
1008 | } | |
1009 | default: | |
1010 | break; | |
1011 | } | |
1012 | skip_domain: | |
1013 | ||
1014 | /* Validate consumer daemon state when start/stop trace command */ | |
1015 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
1016 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
1017 | switch (cmd_ctx->lsm->domain.type) { | |
1018 | case LTTNG_DOMAIN_NONE: | |
1019 | break; | |
1020 | case LTTNG_DOMAIN_JUL: | |
1021 | case LTTNG_DOMAIN_LOG4J: | |
1022 | case LTTNG_DOMAIN_PYTHON: | |
1023 | case LTTNG_DOMAIN_UST: | |
1024 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
1025 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1026 | goto error; | |
1027 | } | |
1028 | break; | |
1029 | case LTTNG_DOMAIN_KERNEL: | |
1030 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
1031 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
1032 | goto error; | |
1033 | } | |
1034 | break; | |
1035 | default: | |
1036 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1037 | goto error; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Check that the UID or GID match that of the tracing session. | |
1043 | * The root user can interact with all sessions. | |
1044 | */ | |
1045 | if (need_tracing_session) { | |
1046 | if (!session_access_ok(cmd_ctx->session, | |
1047 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1048 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || | |
1049 | cmd_ctx->session->destroyed) { | |
1050 | ret = LTTNG_ERR_EPERM; | |
1051 | goto error; | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Send relayd information to consumer as soon as we have a domain and a | |
1057 | * session defined. | |
1058 | */ | |
1059 | if (cmd_ctx->session && need_domain) { | |
1060 | /* | |
1061 | * Setup relayd if not done yet. If the relayd information was already | |
1062 | * sent to the consumer, this call will gracefully return. | |
1063 | */ | |
1064 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1065 | if (ret != LTTNG_OK) { | |
1066 | goto error; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /* Process by command type */ | |
1071 | switch (cmd_ctx->lsm->cmd_type) { | |
1072 | case LTTNG_ADD_CONTEXT: | |
1073 | { | |
1074 | /* | |
1075 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1076 | * payload if the context being added is an application context. | |
1077 | */ | |
1078 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
1079 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1080 | char *provider_name = NULL, *context_name = NULL; | |
1081 | size_t provider_name_len = | |
1082 | cmd_ctx->lsm->u.context.provider_name_len; | |
1083 | size_t context_name_len = | |
1084 | cmd_ctx->lsm->u.context.context_name_len; | |
1085 | ||
1086 | if (provider_name_len == 0 || context_name_len == 0) { | |
1087 | /* | |
1088 | * Application provider and context names MUST | |
1089 | * be provided. | |
1090 | */ | |
1091 | ret = -LTTNG_ERR_INVALID; | |
1092 | goto error; | |
1093 | } | |
1094 | ||
1095 | provider_name = zmalloc(provider_name_len + 1); | |
1096 | if (!provider_name) { | |
1097 | ret = -LTTNG_ERR_NOMEM; | |
1098 | goto error; | |
1099 | } | |
1100 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = | |
1101 | provider_name; | |
1102 | ||
1103 | context_name = zmalloc(context_name_len + 1); | |
1104 | if (!context_name) { | |
1105 | ret = -LTTNG_ERR_NOMEM; | |
1106 | goto error_add_context; | |
1107 | } | |
1108 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = | |
1109 | context_name; | |
1110 | ||
1111 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
1112 | provider_name_len); | |
1113 | if (ret < 0) { | |
1114 | goto error_add_context; | |
1115 | } | |
1116 | ||
1117 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
1118 | context_name_len); | |
1119 | if (ret < 0) { | |
1120 | goto error_add_context; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * cmd_add_context assumes ownership of the provider and context | |
1126 | * names. | |
1127 | */ | |
1128 | ret = cmd_add_context(cmd_ctx->session, | |
1129 | cmd_ctx->lsm->domain.type, | |
1130 | cmd_ctx->lsm->u.context.channel_name, | |
1131 | &cmd_ctx->lsm->u.context.ctx, | |
1132 | kernel_poll_pipe[1]); | |
1133 | ||
1134 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
1135 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
1136 | error_add_context: | |
1137 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
1138 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
1139 | if (ret < 0) { | |
1140 | goto error; | |
1141 | } | |
1142 | break; | |
1143 | } | |
1144 | case LTTNG_DISABLE_CHANNEL: | |
1145 | { | |
1146 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1147 | cmd_ctx->lsm->u.disable.channel_name); | |
1148 | break; | |
1149 | } | |
1150 | case LTTNG_DISABLE_EVENT: | |
1151 | { | |
1152 | ||
1153 | /* | |
1154 | * FIXME: handle filter; for now we just receive the filter's | |
1155 | * bytecode along with the filter expression which are sent by | |
1156 | * liblttng-ctl and discard them. | |
1157 | * | |
1158 | * This fixes an issue where the client may block while sending | |
1159 | * the filter payload and encounter an error because the session | |
1160 | * daemon closes the socket without ever handling this data. | |
1161 | */ | |
1162 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
1163 | cmd_ctx->lsm->u.disable.bytecode_len; | |
1164 | ||
1165 | if (count) { | |
1166 | char data[LTTNG_FILTER_MAX_LEN]; | |
1167 | ||
1168 | DBG("Discarding disable event command payload of size %zu", count); | |
1169 | while (count) { | |
1170 | ret = lttcomm_recv_unix_sock(sock, data, | |
1171 | count > sizeof(data) ? sizeof(data) : count); | |
1172 | if (ret < 0) { | |
1173 | goto error; | |
1174 | } | |
1175 | ||
1176 | count -= (size_t) ret; | |
1177 | } | |
1178 | } | |
1179 | /* FIXME: passing packed structure to non-packed pointer */ | |
1180 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1181 | cmd_ctx->lsm->u.disable.channel_name, | |
1182 | &cmd_ctx->lsm->u.disable.event); | |
1183 | break; | |
1184 | } | |
1185 | case LTTNG_ENABLE_CHANNEL: | |
1186 | { | |
1187 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = | |
1188 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
1189 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
1190 | &cmd_ctx->lsm->u.channel.chan, | |
1191 | kernel_poll_pipe[1]); | |
1192 | break; | |
1193 | } | |
1194 | case LTTNG_TRACK_PID: | |
1195 | { | |
1196 | ret = cmd_track_pid(cmd_ctx->session, | |
1197 | cmd_ctx->lsm->domain.type, | |
1198 | cmd_ctx->lsm->u.pid_tracker.pid); | |
1199 | break; | |
1200 | } | |
1201 | case LTTNG_UNTRACK_PID: | |
1202 | { | |
1203 | ret = cmd_untrack_pid(cmd_ctx->session, | |
1204 | cmd_ctx->lsm->domain.type, | |
1205 | cmd_ctx->lsm->u.pid_tracker.pid); | |
1206 | break; | |
1207 | } | |
1208 | case LTTNG_ENABLE_EVENT: | |
1209 | { | |
1210 | struct lttng_event *ev = NULL; | |
1211 | struct lttng_event_exclusion *exclusion = NULL; | |
1212 | struct lttng_filter_bytecode *bytecode = NULL; | |
1213 | char *filter_expression = NULL; | |
1214 | ||
1215 | /* Handle exclusion events and receive it from the client. */ | |
1216 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
1217 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
1218 | ||
1219 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1220 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1221 | if (!exclusion) { | |
1222 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1223 | goto error; | |
1224 | } | |
1225 | ||
1226 | DBG("Receiving var len exclusion event list from client ..."); | |
1227 | exclusion->count = count; | |
1228 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
1229 | count * LTTNG_SYMBOL_NAME_LEN); | |
1230 | if (ret <= 0) { | |
1231 | DBG("Nothing recv() from client var len data... continuing"); | |
1232 | *sock_error = 1; | |
1233 | free(exclusion); | |
1234 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1235 | goto error; | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | /* Get filter expression from client. */ | |
1240 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
1241 | size_t expression_len = | |
1242 | cmd_ctx->lsm->u.enable.expression_len; | |
1243 | ||
1244 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1245 | ret = LTTNG_ERR_FILTER_INVAL; | |
1246 | free(exclusion); | |
1247 | goto error; | |
1248 | } | |
1249 | ||
1250 | filter_expression = zmalloc(expression_len); | |
1251 | if (!filter_expression) { | |
1252 | free(exclusion); | |
1253 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1254 | goto error; | |
1255 | } | |
1256 | ||
1257 | /* Receive var. len. data */ | |
1258 | DBG("Receiving var len filter's expression from client ..."); | |
1259 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
1260 | expression_len); | |
1261 | if (ret <= 0) { | |
1262 | DBG("Nothing recv() from client var len data... continuing"); | |
1263 | *sock_error = 1; | |
1264 | free(filter_expression); | |
1265 | free(exclusion); | |
1266 | ret = LTTNG_ERR_FILTER_INVAL; | |
1267 | goto error; | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | /* Handle filter and get bytecode from client. */ | |
1272 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
1273 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
1274 | ||
1275 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1276 | ret = LTTNG_ERR_FILTER_INVAL; | |
1277 | free(filter_expression); | |
1278 | free(exclusion); | |
1279 | goto error; | |
1280 | } | |
1281 | ||
1282 | bytecode = zmalloc(bytecode_len); | |
1283 | if (!bytecode) { | |
1284 | free(filter_expression); | |
1285 | free(exclusion); | |
1286 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1287 | goto error; | |
1288 | } | |
1289 | ||
1290 | /* Receive var. len. data */ | |
1291 | DBG("Receiving var len filter's bytecode from client ..."); | |
1292 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
1293 | if (ret <= 0) { | |
1294 | DBG("Nothing recv() from client var len data... continuing"); | |
1295 | *sock_error = 1; | |
1296 | free(filter_expression); | |
1297 | free(bytecode); | |
1298 | free(exclusion); | |
1299 | ret = LTTNG_ERR_FILTER_INVAL; | |
1300 | goto error; | |
1301 | } | |
1302 | ||
1303 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1304 | free(filter_expression); | |
1305 | free(bytecode); | |
1306 | free(exclusion); | |
1307 | ret = LTTNG_ERR_FILTER_INVAL; | |
1308 | goto error; | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | ev = lttng_event_copy(&cmd_ctx->lsm->u.enable.event); | |
1313 | if (!ev) { | |
1314 | DBG("Failed to copy event: %s", | |
1315 | cmd_ctx->lsm->u.enable.event.name); | |
1316 | free(filter_expression); | |
1317 | free(bytecode); | |
1318 | free(exclusion); | |
1319 | ret = LTTNG_ERR_NOMEM; | |
1320 | goto error; | |
1321 | } | |
1322 | ||
1323 | ||
1324 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
1325 | /* Expect a userspace probe description. */ | |
1326 | ret = receive_userspace_probe(cmd_ctx, sock, sock_error, ev); | |
1327 | if (ret) { | |
1328 | free(filter_expression); | |
1329 | free(bytecode); | |
1330 | free(exclusion); | |
1331 | lttng_event_destroy(ev); | |
1332 | goto error; | |
1333 | } | |
1334 | } | |
1335 | ||
1336 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
1337 | cmd_ctx->lsm->u.enable.channel_name, | |
1338 | ev, | |
1339 | filter_expression, bytecode, exclusion, | |
1340 | kernel_poll_pipe[1]); | |
1341 | lttng_event_destroy(ev); | |
1342 | break; | |
1343 | } | |
1344 | case LTTNG_LIST_TRACEPOINTS: | |
1345 | { | |
1346 | struct lttng_event *events; | |
1347 | ssize_t nb_events; | |
1348 | ||
1349 | session_lock_list(); | |
1350 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); | |
1351 | session_unlock_list(); | |
1352 | if (nb_events < 0) { | |
1353 | /* Return value is a negative lttng_error_code. */ | |
1354 | ret = -nb_events; | |
1355 | goto error; | |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * Setup lttng message with payload size set to the event list size in | |
1360 | * bytes and then copy list into the llm payload. | |
1361 | */ | |
1362 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1363 | sizeof(struct lttng_event) * nb_events); | |
1364 | free(events); | |
1365 | ||
1366 | if (ret < 0) { | |
1367 | goto setup_error; | |
1368 | } | |
1369 | ||
1370 | ret = LTTNG_OK; | |
1371 | break; | |
1372 | } | |
1373 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1374 | { | |
1375 | struct lttng_event_field *fields; | |
1376 | ssize_t nb_fields; | |
1377 | ||
1378 | session_lock_list(); | |
1379 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, | |
1380 | &fields); | |
1381 | session_unlock_list(); | |
1382 | if (nb_fields < 0) { | |
1383 | /* Return value is a negative lttng_error_code. */ | |
1384 | ret = -nb_fields; | |
1385 | goto error; | |
1386 | } | |
1387 | ||
1388 | /* | |
1389 | * Setup lttng message with payload size set to the event list size in | |
1390 | * bytes and then copy list into the llm payload. | |
1391 | */ | |
1392 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1393 | sizeof(struct lttng_event_field) * nb_fields); | |
1394 | free(fields); | |
1395 | ||
1396 | if (ret < 0) { | |
1397 | goto setup_error; | |
1398 | } | |
1399 | ||
1400 | ret = LTTNG_OK; | |
1401 | break; | |
1402 | } | |
1403 | case LTTNG_LIST_SYSCALLS: | |
1404 | { | |
1405 | struct lttng_event *events; | |
1406 | ssize_t nb_events; | |
1407 | ||
1408 | nb_events = cmd_list_syscalls(&events); | |
1409 | if (nb_events < 0) { | |
1410 | /* Return value is a negative lttng_error_code. */ | |
1411 | ret = -nb_events; | |
1412 | goto error; | |
1413 | } | |
1414 | ||
1415 | /* | |
1416 | * Setup lttng message with payload size set to the event list size in | |
1417 | * bytes and then copy list into the llm payload. | |
1418 | */ | |
1419 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1420 | sizeof(struct lttng_event) * nb_events); | |
1421 | free(events); | |
1422 | ||
1423 | if (ret < 0) { | |
1424 | goto setup_error; | |
1425 | } | |
1426 | ||
1427 | ret = LTTNG_OK; | |
1428 | break; | |
1429 | } | |
1430 | case LTTNG_LIST_TRACKER_PIDS: | |
1431 | { | |
1432 | int32_t *pids = NULL; | |
1433 | ssize_t nr_pids; | |
1434 | ||
1435 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
1436 | cmd_ctx->lsm->domain.type, &pids); | |
1437 | if (nr_pids < 0) { | |
1438 | /* Return value is a negative lttng_error_code. */ | |
1439 | ret = -nr_pids; | |
1440 | goto error; | |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * Setup lttng message with payload size set to the event list size in | |
1445 | * bytes and then copy list into the llm payload. | |
1446 | */ | |
1447 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, | |
1448 | sizeof(int32_t) * nr_pids); | |
1449 | free(pids); | |
1450 | ||
1451 | if (ret < 0) { | |
1452 | goto setup_error; | |
1453 | } | |
1454 | ||
1455 | ret = LTTNG_OK; | |
1456 | break; | |
1457 | } | |
1458 | case LTTNG_SET_CONSUMER_URI: | |
1459 | { | |
1460 | size_t nb_uri, len; | |
1461 | struct lttng_uri *uris; | |
1462 | ||
1463 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
1464 | len = nb_uri * sizeof(struct lttng_uri); | |
1465 | ||
1466 | if (nb_uri == 0) { | |
1467 | ret = LTTNG_ERR_INVALID; | |
1468 | goto error; | |
1469 | } | |
1470 | ||
1471 | uris = zmalloc(len); | |
1472 | if (uris == NULL) { | |
1473 | ret = LTTNG_ERR_FATAL; | |
1474 | goto error; | |
1475 | } | |
1476 | ||
1477 | /* Receive variable len data */ | |
1478 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
1479 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
1480 | if (ret <= 0) { | |
1481 | DBG("No URIs received from client... continuing"); | |
1482 | *sock_error = 1; | |
1483 | ret = LTTNG_ERR_SESSION_FAIL; | |
1484 | free(uris); | |
1485 | goto error; | |
1486 | } | |
1487 | ||
1488 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1489 | free(uris); | |
1490 | if (ret != LTTNG_OK) { | |
1491 | goto error; | |
1492 | } | |
1493 | ||
1494 | ||
1495 | break; | |
1496 | } | |
1497 | case LTTNG_START_TRACE: | |
1498 | { | |
1499 | /* | |
1500 | * On the first start, if we have a kernel session and we have | |
1501 | * enabled time or size-based rotations, we have to make sure | |
1502 | * the kernel tracer supports it. | |
1503 | */ | |
1504 | if (!cmd_ctx->session->has_been_started && \ | |
1505 | cmd_ctx->session->kernel_session && \ | |
1506 | (cmd_ctx->session->rotate_timer_period || \ | |
1507 | cmd_ctx->session->rotate_size) && \ | |
1508 | !check_rotate_compatible()) { | |
1509 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1510 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1511 | goto error; | |
1512 | } | |
1513 | ret = cmd_start_trace(cmd_ctx->session); | |
1514 | break; | |
1515 | } | |
1516 | case LTTNG_STOP_TRACE: | |
1517 | { | |
1518 | ret = cmd_stop_trace(cmd_ctx->session); | |
1519 | break; | |
1520 | } | |
1521 | case LTTNG_CREATE_SESSION: | |
1522 | { | |
1523 | size_t nb_uri, len; | |
1524 | struct lttng_uri *uris = NULL; | |
1525 | ||
1526 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
1527 | len = nb_uri * sizeof(struct lttng_uri); | |
1528 | ||
1529 | if (nb_uri > 0) { | |
1530 | uris = zmalloc(len); | |
1531 | if (uris == NULL) { | |
1532 | ret = LTTNG_ERR_FATAL; | |
1533 | goto error; | |
1534 | } | |
1535 | ||
1536 | /* Receive variable len data */ | |
1537 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
1538 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
1539 | if (ret <= 0) { | |
1540 | DBG("No URIs received from client... continuing"); | |
1541 | *sock_error = 1; | |
1542 | ret = LTTNG_ERR_SESSION_FAIL; | |
1543 | free(uris); | |
1544 | goto error; | |
1545 | } | |
1546 | ||
1547 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
1548 | DBG("Creating session with ONE network URI is a bad call"); | |
1549 | ret = LTTNG_ERR_SESSION_FAIL; | |
1550 | free(uris); | |
1551 | goto error; | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
1556 | &cmd_ctx->creds, 0); | |
1557 | ||
1558 | free(uris); | |
1559 | ||
1560 | break; | |
1561 | } | |
1562 | case LTTNG_DESTROY_SESSION: | |
1563 | { | |
1564 | ret = cmd_destroy_session(cmd_ctx->session, | |
1565 | notification_thread_handle); | |
1566 | break; | |
1567 | } | |
1568 | case LTTNG_LIST_DOMAINS: | |
1569 | { | |
1570 | ssize_t nb_dom; | |
1571 | struct lttng_domain *domains = NULL; | |
1572 | ||
1573 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1574 | if (nb_dom < 0) { | |
1575 | /* Return value is a negative lttng_error_code. */ | |
1576 | ret = -nb_dom; | |
1577 | goto error; | |
1578 | } | |
1579 | ||
1580 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1581 | nb_dom * sizeof(struct lttng_domain)); | |
1582 | free(domains); | |
1583 | ||
1584 | if (ret < 0) { | |
1585 | goto setup_error; | |
1586 | } | |
1587 | ||
1588 | ret = LTTNG_OK; | |
1589 | break; | |
1590 | } | |
1591 | case LTTNG_LIST_CHANNELS: | |
1592 | { | |
1593 | ssize_t payload_size; | |
1594 | struct lttng_channel *channels = NULL; | |
1595 | ||
1596 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, | |
1597 | cmd_ctx->session, &channels); | |
1598 | if (payload_size < 0) { | |
1599 | /* Return value is a negative lttng_error_code. */ | |
1600 | ret = -payload_size; | |
1601 | goto error; | |
1602 | } | |
1603 | ||
1604 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
1605 | payload_size); | |
1606 | free(channels); | |
1607 | ||
1608 | if (ret < 0) { | |
1609 | goto setup_error; | |
1610 | } | |
1611 | ||
1612 | ret = LTTNG_OK; | |
1613 | break; | |
1614 | } | |
1615 | case LTTNG_LIST_EVENTS: | |
1616 | { | |
1617 | ssize_t nb_event; | |
1618 | struct lttng_event *events = NULL; | |
1619 | struct lttcomm_event_command_header cmd_header; | |
1620 | size_t total_size; | |
1621 | ||
1622 | memset(&cmd_header, 0, sizeof(cmd_header)); | |
1623 | /* Extended infos are included at the end of events */ | |
1624 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
1625 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
1626 | &events, &total_size); | |
1627 | ||
1628 | if (nb_event < 0) { | |
1629 | /* Return value is a negative lttng_error_code. */ | |
1630 | ret = -nb_event; | |
1631 | goto error; | |
1632 | } | |
1633 | ||
1634 | cmd_header.nb_events = nb_event; | |
1635 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
1636 | &cmd_header, sizeof(cmd_header)); | |
1637 | free(events); | |
1638 | ||
1639 | if (ret < 0) { | |
1640 | goto setup_error; | |
1641 | } | |
1642 | ||
1643 | ret = LTTNG_OK; | |
1644 | break; | |
1645 | } | |
1646 | case LTTNG_LIST_SESSIONS: | |
1647 | { | |
1648 | unsigned int nr_sessions; | |
1649 | void *sessions_payload; | |
1650 | size_t payload_len; | |
1651 | ||
1652 | session_lock_list(); | |
1653 | nr_sessions = lttng_sessions_count( | |
1654 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1655 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
1656 | payload_len = sizeof(struct lttng_session) * nr_sessions; | |
1657 | sessions_payload = zmalloc(payload_len); | |
1658 | ||
1659 | if (!sessions_payload) { | |
1660 | session_unlock_list(); | |
1661 | ret = -ENOMEM; | |
1662 | goto setup_error; | |
1663 | } | |
1664 | ||
1665 | cmd_list_lttng_sessions(sessions_payload, | |
1666 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1667 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
1668 | session_unlock_list(); | |
1669 | ||
1670 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
1671 | payload_len); | |
1672 | free(sessions_payload); | |
1673 | ||
1674 | if (ret < 0) { | |
1675 | goto setup_error; | |
1676 | } | |
1677 | ||
1678 | ret = LTTNG_OK; | |
1679 | break; | |
1680 | } | |
1681 | case LTTNG_REGISTER_CONSUMER: | |
1682 | { | |
1683 | struct consumer_data *cdata; | |
1684 | ||
1685 | switch (cmd_ctx->lsm->domain.type) { | |
1686 | case LTTNG_DOMAIN_KERNEL: | |
1687 | cdata = &kconsumer_data; | |
1688 | break; | |
1689 | default: | |
1690 | ret = LTTNG_ERR_UND; | |
1691 | goto error; | |
1692 | } | |
1693 | ||
1694 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1695 | cmd_ctx->lsm->u.reg.path, cdata); | |
1696 | break; | |
1697 | } | |
1698 | case LTTNG_DATA_PENDING: | |
1699 | { | |
1700 | int pending_ret; | |
1701 | uint8_t pending_ret_byte; | |
1702 | ||
1703 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
1704 | ||
1705 | /* | |
1706 | * FIXME | |
1707 | * | |
1708 | * This function may returns 0 or 1 to indicate whether or not | |
1709 | * there is data pending. In case of error, it should return an | |
1710 | * LTTNG_ERR code. However, some code paths may still return | |
1711 | * a nondescript error code, which we handle by returning an | |
1712 | * "unknown" error. | |
1713 | */ | |
1714 | if (pending_ret == 0 || pending_ret == 1) { | |
1715 | /* | |
1716 | * ret will be set to LTTNG_OK at the end of | |
1717 | * this function. | |
1718 | */ | |
1719 | } else if (pending_ret < 0) { | |
1720 | ret = LTTNG_ERR_UNK; | |
1721 | goto setup_error; | |
1722 | } else { | |
1723 | ret = pending_ret; | |
1724 | goto setup_error; | |
1725 | } | |
1726 | ||
1727 | pending_ret_byte = (uint8_t) pending_ret; | |
1728 | ||
1729 | /* 1 byte to return whether or not data is pending */ | |
1730 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
1731 | &pending_ret_byte, 1); | |
1732 | ||
1733 | if (ret < 0) { | |
1734 | goto setup_error; | |
1735 | } | |
1736 | ||
1737 | ret = LTTNG_OK; | |
1738 | break; | |
1739 | } | |
1740 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
1741 | { | |
1742 | struct lttcomm_lttng_output_id reply; | |
1743 | ||
1744 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
1745 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
1746 | if (ret != LTTNG_OK) { | |
1747 | goto error; | |
1748 | } | |
1749 | ||
1750 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
1751 | sizeof(reply)); | |
1752 | if (ret < 0) { | |
1753 | goto setup_error; | |
1754 | } | |
1755 | ||
1756 | /* Copy output list into message payload */ | |
1757 | ret = LTTNG_OK; | |
1758 | break; | |
1759 | } | |
1760 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
1761 | { | |
1762 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
1763 | &cmd_ctx->lsm->u.snapshot_output.output); | |
1764 | break; | |
1765 | } | |
1766 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
1767 | { | |
1768 | ssize_t nb_output; | |
1769 | struct lttng_snapshot_output *outputs = NULL; | |
1770 | ||
1771 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
1772 | if (nb_output < 0) { | |
1773 | ret = -nb_output; | |
1774 | goto error; | |
1775 | } | |
1776 | ||
1777 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
1778 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
1779 | nb_output * sizeof(struct lttng_snapshot_output)); | |
1780 | free(outputs); | |
1781 | ||
1782 | if (ret < 0) { | |
1783 | goto setup_error; | |
1784 | } | |
1785 | ||
1786 | ret = LTTNG_OK; | |
1787 | break; | |
1788 | } | |
1789 | case LTTNG_SNAPSHOT_RECORD: | |
1790 | { | |
1791 | ret = cmd_snapshot_record(cmd_ctx->session, | |
1792 | &cmd_ctx->lsm->u.snapshot_record.output, | |
1793 | cmd_ctx->lsm->u.snapshot_record.wait); | |
1794 | break; | |
1795 | } | |
1796 | case LTTNG_CREATE_SESSION_SNAPSHOT: | |
1797 | { | |
1798 | size_t nb_uri, len; | |
1799 | struct lttng_uri *uris = NULL; | |
1800 | ||
1801 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
1802 | len = nb_uri * sizeof(struct lttng_uri); | |
1803 | ||
1804 | if (nb_uri > 0) { | |
1805 | uris = zmalloc(len); | |
1806 | if (uris == NULL) { | |
1807 | ret = LTTNG_ERR_FATAL; | |
1808 | goto error; | |
1809 | } | |
1810 | ||
1811 | /* Receive variable len data */ | |
1812 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
1813 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
1814 | if (ret <= 0) { | |
1815 | DBG("No URIs received from client... continuing"); | |
1816 | *sock_error = 1; | |
1817 | ret = LTTNG_ERR_SESSION_FAIL; | |
1818 | free(uris); | |
1819 | goto error; | |
1820 | } | |
1821 | ||
1822 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
1823 | DBG("Creating session with ONE network URI is a bad call"); | |
1824 | ret = LTTNG_ERR_SESSION_FAIL; | |
1825 | free(uris); | |
1826 | goto error; | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
1831 | nb_uri, &cmd_ctx->creds); | |
1832 | free(uris); | |
1833 | break; | |
1834 | } | |
1835 | case LTTNG_CREATE_SESSION_LIVE: | |
1836 | { | |
1837 | size_t nb_uri, len; | |
1838 | struct lttng_uri *uris = NULL; | |
1839 | ||
1840 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
1841 | len = nb_uri * sizeof(struct lttng_uri); | |
1842 | ||
1843 | if (nb_uri > 0) { | |
1844 | uris = zmalloc(len); | |
1845 | if (uris == NULL) { | |
1846 | ret = LTTNG_ERR_FATAL; | |
1847 | goto error; | |
1848 | } | |
1849 | ||
1850 | /* Receive variable len data */ | |
1851 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
1852 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
1853 | if (ret <= 0) { | |
1854 | DBG("No URIs received from client... continuing"); | |
1855 | *sock_error = 1; | |
1856 | ret = LTTNG_ERR_SESSION_FAIL; | |
1857 | free(uris); | |
1858 | goto error; | |
1859 | } | |
1860 | ||
1861 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
1862 | DBG("Creating session with ONE network URI is a bad call"); | |
1863 | ret = LTTNG_ERR_SESSION_FAIL; | |
1864 | free(uris); | |
1865 | goto error; | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
1870 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
1871 | free(uris); | |
1872 | break; | |
1873 | } | |
1874 | case LTTNG_SAVE_SESSION: | |
1875 | { | |
1876 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
1877 | &cmd_ctx->creds); | |
1878 | break; | |
1879 | } | |
1880 | case LTTNG_SET_SESSION_SHM_PATH: | |
1881 | { | |
1882 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
1883 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
1884 | break; | |
1885 | } | |
1886 | case LTTNG_REGENERATE_METADATA: | |
1887 | { | |
1888 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
1889 | break; | |
1890 | } | |
1891 | case LTTNG_REGENERATE_STATEDUMP: | |
1892 | { | |
1893 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
1894 | break; | |
1895 | } | |
1896 | case LTTNG_REGISTER_TRIGGER: | |
1897 | { | |
1898 | ret = cmd_register_trigger(cmd_ctx, sock, | |
1899 | notification_thread_handle); | |
1900 | break; | |
1901 | } | |
1902 | case LTTNG_UNREGISTER_TRIGGER: | |
1903 | { | |
1904 | ret = cmd_unregister_trigger(cmd_ctx, sock, | |
1905 | notification_thread_handle); | |
1906 | break; | |
1907 | } | |
1908 | case LTTNG_ROTATE_SESSION: | |
1909 | { | |
1910 | struct lttng_rotate_session_return rotate_return; | |
1911 | ||
1912 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
1913 | ||
1914 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
1915 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
1916 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1917 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1918 | goto error; | |
1919 | } | |
1920 | ||
1921 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return); | |
1922 | if (ret < 0) { | |
1923 | ret = -ret; | |
1924 | goto error; | |
1925 | } | |
1926 | ||
1927 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
1928 | sizeof(rotate_return)); | |
1929 | if (ret < 0) { | |
1930 | ret = -ret; | |
1931 | goto error; | |
1932 | } | |
1933 | ||
1934 | ret = LTTNG_OK; | |
1935 | break; | |
1936 | } | |
1937 | case LTTNG_ROTATION_GET_INFO: | |
1938 | { | |
1939 | struct lttng_rotation_get_info_return get_info_return; | |
1940 | ||
1941 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
1942 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
1943 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
1944 | if (ret < 0) { | |
1945 | ret = -ret; | |
1946 | goto error; | |
1947 | } | |
1948 | ||
1949 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
1950 | sizeof(get_info_return)); | |
1951 | if (ret < 0) { | |
1952 | ret = -ret; | |
1953 | goto error; | |
1954 | } | |
1955 | ||
1956 | ret = LTTNG_OK; | |
1957 | break; | |
1958 | } | |
1959 | case LTTNG_ROTATION_SET_SCHEDULE: | |
1960 | { | |
1961 | bool set_schedule; | |
1962 | enum lttng_rotation_schedule_type schedule_type; | |
1963 | uint64_t value; | |
1964 | ||
1965 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
1966 | DBG("Kernel tracer version does not support session rotations"); | |
1967 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1968 | goto error; | |
1969 | } | |
1970 | ||
1971 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; | |
1972 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
1973 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
1974 | ||
1975 | ret = cmd_rotation_set_schedule(cmd_ctx->session, | |
1976 | set_schedule, | |
1977 | schedule_type, | |
1978 | value, | |
1979 | notification_thread_handle); | |
1980 | if (ret != LTTNG_OK) { | |
1981 | goto error; | |
1982 | } | |
1983 | ||
1984 | break; | |
1985 | } | |
1986 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
1987 | { | |
1988 | struct lttng_session_list_schedules_return schedules = { | |
1989 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
1990 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
1991 | .size.set = !!cmd_ctx->session->rotate_size, | |
1992 | .size.value = cmd_ctx->session->rotate_size, | |
1993 | }; | |
1994 | ||
1995 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
1996 | sizeof(schedules)); | |
1997 | if (ret < 0) { | |
1998 | ret = -ret; | |
1999 | goto error; | |
2000 | } | |
2001 | ||
2002 | ret = LTTNG_OK; | |
2003 | break; | |
2004 | } | |
818ea544 JR |
2005 | case LTTNG_CLEAR_SESSION: |
2006 | { | |
2007 | ret = cmd_clear_session(cmd_ctx->session); | |
2008 | if (ret != LTTNG_OK) { | |
2009 | goto error; | |
2010 | } | |
2011 | break; | |
2012 | } | |
917a718d JG |
2013 | default: |
2014 | ret = LTTNG_ERR_UND; | |
2015 | break; | |
2016 | } | |
2017 | ||
2018 | error: | |
2019 | if (cmd_ctx->llm == NULL) { | |
2020 | DBG("Missing llm structure. Allocating one."); | |
2021 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { | |
2022 | goto setup_error; | |
2023 | } | |
2024 | } | |
2025 | /* Set return code */ | |
2026 | cmd_ctx->llm->ret_code = ret; | |
2027 | setup_error: | |
2028 | if (cmd_ctx->session) { | |
2029 | session_unlock(cmd_ctx->session); | |
2030 | session_put(cmd_ctx->session); | |
2031 | } | |
2032 | if (need_tracing_session) { | |
2033 | session_unlock_list(); | |
2034 | } | |
2035 | init_setup_error: | |
2036 | assert(!rcu_read_ongoing()); | |
2037 | return ret; | |
2038 | } | |
2039 | ||
2040 | static int create_client_sock(void) | |
2041 | { | |
2042 | int ret, client_sock; | |
2043 | const mode_t old_umask = umask(0); | |
2044 | ||
2045 | /* Create client tool unix socket */ | |
2046 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); | |
2047 | if (client_sock < 0) { | |
2048 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); | |
2049 | ret = -1; | |
2050 | goto end; | |
2051 | } | |
2052 | ||
2053 | /* Set the cloexec flag */ | |
2054 | ret = utils_set_fd_cloexec(client_sock); | |
2055 | if (ret < 0) { | |
2056 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
2057 | "Continuing but note that the consumer daemon will have a " | |
2058 | "reference to this socket on exec()", client_sock); | |
2059 | } | |
2060 | ||
2061 | /* File permission MUST be 660 */ | |
2062 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2063 | if (ret < 0) { | |
2064 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); | |
2065 | PERROR("chmod"); | |
2066 | goto end; | |
2067 | } | |
2068 | DBG("Created client socket (fd = %i)", client_sock); | |
2069 | ret = client_sock; | |
2070 | end: | |
2071 | umask(old_umask); | |
2072 | return ret; | |
2073 | } | |
2074 | ||
2075 | static void cleanup_client_thread(void *data) | |
2076 | { | |
2077 | struct lttng_pipe *quit_pipe = data; | |
2078 | ||
2079 | lttng_pipe_destroy(quit_pipe); | |
2080 | } | |
2081 | ||
6cb45e93 JG |
2082 | static void thread_init_cleanup(void *data) |
2083 | { | |
2084 | set_thread_status(false); | |
2085 | } | |
2086 | ||
917a718d JG |
2087 | /* |
2088 | * This thread manage all clients request using the unix client socket for | |
2089 | * communication. | |
2090 | */ | |
2091 | static void *thread_manage_clients(void *data) | |
2092 | { | |
2093 | int sock = -1, ret, i, pollfd, err = -1; | |
2094 | int sock_error; | |
2095 | uint32_t revents, nb_fd; | |
2096 | struct command_ctx *cmd_ctx = NULL; | |
2097 | struct lttng_poll_event events; | |
2098 | int client_sock = -1; | |
2099 | struct lttng_pipe *quit_pipe = data; | |
2100 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
2101 | ||
2102 | DBG("[thread] Manage client started"); | |
2103 | ||
2104 | is_root = (getuid() == 0); | |
2105 | ||
6cb45e93 | 2106 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2107 | client_sock = create_client_sock(); |
2108 | if (client_sock < 0) { | |
2109 | goto error_listen; | |
2110 | } | |
2111 | ||
2112 | rcu_register_thread(); | |
2113 | ||
2114 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); | |
2115 | ||
2116 | health_code_update(); | |
2117 | ||
2118 | ret = lttcomm_listen_unix_sock(client_sock); | |
2119 | if (ret < 0) { | |
2120 | goto error_listen; | |
2121 | } | |
2122 | ||
2123 | /* | |
2124 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2125 | * more will be added to this poll set. | |
2126 | */ | |
2127 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2128 | if (ret < 0) { | |
2129 | goto error_create_poll; | |
2130 | } | |
2131 | ||
2132 | /* Add the application registration socket */ | |
2133 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2134 | if (ret < 0) { | |
2135 | goto error; | |
2136 | } | |
2137 | ||
2138 | /* Add thread quit pipe */ | |
2139 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2140 | if (ret < 0) { | |
2141 | goto error; | |
2142 | } | |
2143 | ||
6cb45e93 JG |
2144 | /* Set state as running. */ |
2145 | set_thread_status(true); | |
2146 | pthread_cleanup_pop(0); | |
2147 | ||
917a718d JG |
2148 | /* This testpoint is after we signal readiness to the parent. */ |
2149 | if (testpoint(sessiond_thread_manage_clients)) { | |
2150 | goto error; | |
2151 | } | |
2152 | ||
2153 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2154 | goto error; | |
2155 | } | |
2156 | ||
2157 | health_code_update(); | |
2158 | ||
917a718d JG |
2159 | while (1) { |
2160 | const struct cmd_completion_handler *cmd_completion_handler; | |
2161 | ||
2162 | DBG("Accepting client command ..."); | |
2163 | ||
2164 | /* Inifinite blocking call, waiting for transmission */ | |
2165 | restart: | |
2166 | health_poll_entry(); | |
2167 | ret = lttng_poll_wait(&events, -1); | |
2168 | health_poll_exit(); | |
2169 | if (ret < 0) { | |
2170 | /* | |
2171 | * Restart interrupted system call. | |
2172 | */ | |
2173 | if (errno == EINTR) { | |
2174 | goto restart; | |
2175 | } | |
2176 | goto error; | |
2177 | } | |
2178 | ||
2179 | nb_fd = ret; | |
2180 | ||
2181 | for (i = 0; i < nb_fd; i++) { | |
2182 | revents = LTTNG_POLL_GETEV(&events, i); | |
2183 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2184 | ||
2185 | health_code_update(); | |
2186 | ||
2187 | if (!revents) { | |
2188 | /* No activity for this FD (poll implementation). */ | |
2189 | continue; | |
2190 | } | |
2191 | ||
2192 | if (pollfd == thread_quit_pipe_fd) { | |
2193 | err = 0; | |
2194 | goto exit; | |
2195 | } else { | |
2196 | /* Event on the registration socket */ | |
2197 | if (revents & LPOLLIN) { | |
2198 | continue; | |
2199 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2200 | ERR("Client socket poll error"); | |
2201 | goto error; | |
2202 | } else { | |
2203 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2204 | goto error; | |
2205 | } | |
2206 | } | |
2207 | } | |
2208 | ||
2209 | DBG("Wait for client response"); | |
2210 | ||
2211 | health_code_update(); | |
2212 | ||
2213 | sock = lttcomm_accept_unix_sock(client_sock); | |
2214 | if (sock < 0) { | |
2215 | goto error; | |
2216 | } | |
2217 | ||
2218 | /* | |
2219 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2220 | * show must go on. | |
2221 | */ | |
2222 | (void) utils_set_fd_cloexec(sock); | |
2223 | ||
2224 | /* Set socket option for credentials retrieval */ | |
2225 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2226 | if (ret < 0) { | |
2227 | goto error; | |
2228 | } | |
2229 | ||
2230 | /* Allocate context command to process the client request */ | |
2231 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); | |
2232 | if (cmd_ctx == NULL) { | |
2233 | PERROR("zmalloc cmd_ctx"); | |
2234 | goto error; | |
2235 | } | |
2236 | ||
2237 | /* Allocate data buffer for reception */ | |
2238 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); | |
2239 | if (cmd_ctx->lsm == NULL) { | |
2240 | PERROR("zmalloc cmd_ctx->lsm"); | |
2241 | goto error; | |
2242 | } | |
2243 | ||
2244 | cmd_ctx->llm = NULL; | |
2245 | cmd_ctx->session = NULL; | |
2246 | ||
2247 | health_code_update(); | |
2248 | ||
2249 | /* | |
2250 | * Data is received from the lttng client. The struct | |
2251 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2252 | * the client. | |
2253 | */ | |
2254 | DBG("Receiving data from client ..."); | |
2255 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, | |
2256 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
2257 | if (ret <= 0) { | |
2258 | DBG("Nothing recv() from client... continuing"); | |
2259 | ret = close(sock); | |
2260 | if (ret) { | |
2261 | PERROR("close"); | |
2262 | } | |
2263 | sock = -1; | |
2264 | clean_command_ctx(&cmd_ctx); | |
2265 | continue; | |
2266 | } | |
2267 | ||
2268 | health_code_update(); | |
2269 | ||
2270 | // TODO: Validate cmd_ctx including sanity check for | |
2271 | // security purpose. | |
2272 | ||
2273 | rcu_thread_online(); | |
2274 | /* | |
2275 | * This function dispatch the work to the kernel or userspace tracer | |
2276 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2277 | * informations for the client. The command context struct contains | |
2278 | * everything this function may needs. | |
2279 | */ | |
2280 | ret = process_client_msg(cmd_ctx, sock, &sock_error); | |
2281 | rcu_thread_offline(); | |
2282 | if (ret < 0) { | |
2283 | ret = close(sock); | |
2284 | if (ret) { | |
2285 | PERROR("close"); | |
2286 | } | |
2287 | sock = -1; | |
2288 | /* | |
2289 | * TODO: Inform client somehow of the fatal error. At | |
2290 | * this point, ret < 0 means that a zmalloc failed | |
2291 | * (ENOMEM). Error detected but still accept | |
2292 | * command, unless a socket error has been | |
2293 | * detected. | |
2294 | */ | |
2295 | clean_command_ctx(&cmd_ctx); | |
2296 | continue; | |
2297 | } | |
2298 | ||
2299 | cmd_completion_handler = cmd_pop_completion_handler(); | |
2300 | if (cmd_completion_handler) { | |
2301 | enum lttng_error_code completion_code; | |
2302 | ||
2303 | completion_code = cmd_completion_handler->run( | |
2304 | cmd_completion_handler->data); | |
2305 | if (completion_code != LTTNG_OK) { | |
2306 | clean_command_ctx(&cmd_ctx); | |
2307 | continue; | |
2308 | } | |
2309 | } | |
2310 | ||
2311 | health_code_update(); | |
2312 | ||
2313 | DBG("Sending response (size: %d, retcode: %s (%d))", | |
2314 | cmd_ctx->lttng_msg_size, | |
2315 | lttng_strerror(-cmd_ctx->llm->ret_code), | |
2316 | cmd_ctx->llm->ret_code); | |
2317 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2318 | if (ret < 0) { | |
2319 | ERR("Failed to send data back to client"); | |
2320 | } | |
2321 | ||
2322 | /* End of transmission */ | |
2323 | ret = close(sock); | |
2324 | if (ret) { | |
2325 | PERROR("close"); | |
2326 | } | |
2327 | sock = -1; | |
2328 | ||
2329 | clean_command_ctx(&cmd_ctx); | |
2330 | ||
2331 | health_code_update(); | |
2332 | } | |
2333 | ||
2334 | exit: | |
2335 | error: | |
2336 | if (sock >= 0) { | |
2337 | ret = close(sock); | |
2338 | if (ret) { | |
2339 | PERROR("close"); | |
2340 | } | |
2341 | } | |
2342 | ||
2343 | lttng_poll_clean(&events); | |
2344 | clean_command_ctx(&cmd_ctx); | |
2345 | ||
2346 | error_listen: | |
2347 | error_create_poll: | |
2348 | unlink(config.client_unix_sock_path.value); | |
2349 | if (client_sock >= 0) { | |
2350 | ret = close(client_sock); | |
2351 | if (ret) { | |
2352 | PERROR("close"); | |
2353 | } | |
2354 | } | |
2355 | ||
2356 | if (err) { | |
2357 | health_error(); | |
2358 | ERR("Health error occurred in %s", __func__); | |
2359 | } | |
2360 | ||
2361 | health_unregister(health_sessiond); | |
2362 | ||
2363 | DBG("Client thread dying"); | |
2364 | ||
2365 | rcu_unregister_thread(); | |
917a718d JG |
2366 | return NULL; |
2367 | } | |
2368 | ||
2369 | static | |
2370 | bool shutdown_client_thread(void *thread_data) | |
2371 | { | |
2372 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2373 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2374 | ||
2375 | return notify_thread_pipe(write_fd) == 1; | |
2376 | } | |
2377 | ||
2378 | struct lttng_thread *launch_client_thread(void) | |
2379 | { | |
6cb45e93 | 2380 | bool thread_running; |
917a718d JG |
2381 | struct lttng_pipe *client_quit_pipe; |
2382 | struct lttng_thread *thread; | |
2383 | ||
6cb45e93 | 2384 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2385 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2386 | if (!client_quit_pipe) { | |
2387 | goto error; | |
2388 | } | |
2389 | ||
2390 | thread = lttng_thread_create("Client management", | |
2391 | thread_manage_clients, | |
2392 | shutdown_client_thread, | |
2393 | cleanup_client_thread, | |
2394 | client_quit_pipe); | |
2395 | if (!thread) { | |
2396 | goto error; | |
2397 | } | |
2398 | ||
2399 | /* | |
2400 | * This thread is part of the threads that need to be fully | |
2401 | * initialized before the session daemon is marked as "ready". | |
2402 | */ | |
6cb45e93 JG |
2403 | thread_running = wait_thread_status(); |
2404 | if (!thread_running) { | |
2405 | lttng_thread_put(thread); | |
2406 | thread = NULL; | |
2407 | } | |
917a718d JG |
2408 | return thread; |
2409 | error: | |
2410 | cleanup_client_thread(client_quit_pipe); | |
2411 | return NULL; | |
2412 | } |