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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> | |
b178f53e JG |
29 | #include <lttng/session-internal.h> |
30 | #include <lttng/session-descriptor-internal.h> | |
917a718d JG |
31 | |
32 | #include "client.h" | |
33 | #include "lttng-sessiond.h" | |
34 | #include "cmd.h" | |
35 | #include "kernel.h" | |
36 | #include "save.h" | |
37 | #include "health-sessiond.h" | |
38 | #include "testpoint.h" | |
39 | #include "utils.h" | |
4ec029ed | 40 | #include "manage-consumer.h" |
022349df | 41 | #include "clear.h" |
917a718d JG |
42 | |
43 | static bool is_root; | |
44 | ||
45 | static struct thread_state { | |
6cb45e93 JG |
46 | sem_t ready; |
47 | bool running; | |
0f68efb6 | 48 | int client_sock; |
6cb45e93 JG |
49 | } thread_state; |
50 | ||
51 | static void set_thread_status(bool running) | |
917a718d | 52 | { |
6cb45e93 JG |
53 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
54 | thread_state.running = running; | |
55 | sem_post(&thread_state.ready); | |
917a718d JG |
56 | } |
57 | ||
6cb45e93 | 58 | static bool wait_thread_status(void) |
917a718d | 59 | { |
6cb45e93 JG |
60 | DBG("Waiting for client thread to be ready"); |
61 | sem_wait(&thread_state.ready); | |
62 | if (thread_state.running) { | |
63 | DBG("Client thread is ready"); | |
64 | } else { | |
65 | ERR("Initialization of client thread failed"); | |
917a718d | 66 | } |
6cb45e93 JG |
67 | |
68 | return thread_state.running; | |
917a718d JG |
69 | } |
70 | ||
71 | /* | |
72 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
73 | * right amount of memory and copying the original information from the lsm | |
74 | * structure. | |
75 | * | |
76 | * Return 0 on success, negative value on error. | |
77 | */ | |
78 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
79 | const void *payload_buf, size_t payload_len, | |
80 | const void *cmd_header_buf, size_t cmd_header_len) | |
81 | { | |
82 | int ret = 0; | |
83 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
84 | const size_t cmd_header_offset = header_len; | |
85 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
86 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
87 | ||
99a98ed3 | 88 | free(cmd_ctx->llm); |
917a718d JG |
89 | cmd_ctx->llm = zmalloc(total_msg_size); |
90 | ||
91 | if (cmd_ctx->llm == NULL) { | |
92 | PERROR("zmalloc"); | |
93 | ret = -ENOMEM; | |
94 | goto end; | |
95 | } | |
96 | ||
97 | /* Copy common data */ | |
98 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
99 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; | |
100 | cmd_ctx->llm->cmd_header_size = cmd_header_len; | |
101 | cmd_ctx->llm->data_size = payload_len; | |
102 | cmd_ctx->lttng_msg_size = total_msg_size; | |
103 | ||
104 | /* Copy command header */ | |
105 | if (cmd_header_len) { | |
106 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
107 | cmd_header_len); | |
108 | } | |
109 | ||
110 | /* Copy payload */ | |
111 | if (payload_len) { | |
112 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
113 | payload_len); | |
114 | } | |
115 | ||
116 | end: | |
117 | return ret; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 122 | * exec or it will fail. |
917a718d JG |
123 | */ |
124 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
125 | { | |
4ec029ed | 126 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
127 | } |
128 | ||
129 | /* | |
130 | * Fork and exec a consumer daemon (consumerd). | |
131 | * | |
132 | * Return pid if successful else -1. | |
133 | */ | |
134 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
135 | { | |
136 | int ret; | |
137 | pid_t pid; | |
138 | const char *consumer_to_use; | |
139 | const char *verbosity; | |
140 | struct stat st; | |
141 | ||
142 | DBG("Spawning consumerd"); | |
143 | ||
144 | pid = fork(); | |
145 | if (pid == 0) { | |
146 | /* | |
147 | * Exec consumerd. | |
148 | */ | |
149 | if (config.verbose_consumer) { | |
150 | verbosity = "--verbose"; | |
151 | } else if (lttng_opt_quiet) { | |
152 | verbosity = "--quiet"; | |
153 | } else { | |
154 | verbosity = ""; | |
155 | } | |
156 | ||
157 | switch (consumer_data->type) { | |
158 | case LTTNG_CONSUMER_KERNEL: | |
159 | /* | |
160 | * Find out which consumerd to execute. We will first try the | |
161 | * 64-bit path, then the sessiond's installation directory, and | |
162 | * fallback on the 32-bit one, | |
163 | */ | |
164 | DBG3("Looking for a kernel consumer at these locations:"); | |
165 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); | |
166 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); | |
167 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); | |
168 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { | |
169 | DBG3("Found location #1"); | |
170 | consumer_to_use = config.consumerd64_bin_path.value; | |
171 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
172 | DBG3("Found location #2"); | |
173 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
174 | } else if (config.consumerd32_bin_path.value && | |
175 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
176 | DBG3("Found location #3"); | |
177 | consumer_to_use = config.consumerd32_bin_path.value; | |
178 | } else { | |
179 | DBG("Could not find any valid consumerd executable"); | |
180 | ret = -EINVAL; | |
181 | goto error; | |
182 | } | |
183 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
184 | (void) execl(consumer_to_use, | |
185 | "lttng-consumerd", verbosity, "-k", | |
186 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
187 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
188 | "--group", config.tracing_group_name.value, | |
189 | NULL); | |
190 | break; | |
191 | case LTTNG_CONSUMER64_UST: | |
192 | { | |
193 | if (config.consumerd64_lib_dir.value) { | |
194 | char *tmp; | |
195 | size_t tmplen; | |
196 | char *tmpnew; | |
197 | ||
198 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
199 | if (!tmp) { | |
200 | tmp = ""; | |
201 | } | |
202 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
203 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
204 | if (!tmpnew) { | |
205 | ret = -ENOMEM; | |
206 | goto error; | |
207 | } | |
208 | strcat(tmpnew, config.consumerd64_lib_dir.value); | |
209 | if (tmp[0] != '\0') { | |
210 | strcat(tmpnew, ":"); | |
211 | strcat(tmpnew, tmp); | |
212 | } | |
213 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
214 | free(tmpnew); | |
215 | if (ret) { | |
216 | ret = -errno; | |
217 | goto error; | |
218 | } | |
219 | } | |
220 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); | |
221 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
222 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
223 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
224 | "--group", config.tracing_group_name.value, | |
225 | NULL); | |
226 | break; | |
227 | } | |
228 | case LTTNG_CONSUMER32_UST: | |
229 | { | |
230 | if (config.consumerd32_lib_dir.value) { | |
231 | char *tmp; | |
232 | size_t tmplen; | |
233 | char *tmpnew; | |
234 | ||
235 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
236 | if (!tmp) { | |
237 | tmp = ""; | |
238 | } | |
239 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
240 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
241 | if (!tmpnew) { | |
242 | ret = -ENOMEM; | |
243 | goto error; | |
244 | } | |
245 | strcat(tmpnew, config.consumerd32_lib_dir.value); | |
246 | if (tmp[0] != '\0') { | |
247 | strcat(tmpnew, ":"); | |
248 | strcat(tmpnew, tmp); | |
249 | } | |
250 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
251 | free(tmpnew); | |
252 | if (ret) { | |
253 | ret = -errno; | |
254 | goto error; | |
255 | } | |
256 | } | |
257 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); | |
258 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
259 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
260 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
261 | "--group", config.tracing_group_name.value, | |
262 | NULL); | |
263 | break; | |
264 | } | |
265 | default: | |
266 | ERR("unknown consumer type"); | |
267 | errno = 0; | |
268 | } | |
269 | if (errno != 0) { | |
270 | PERROR("Consumer execl()"); | |
271 | } | |
272 | /* Reaching this point, we got a failure on our execl(). */ | |
273 | exit(EXIT_FAILURE); | |
274 | } else if (pid > 0) { | |
275 | ret = pid; | |
276 | } else { | |
277 | PERROR("start consumer fork"); | |
278 | ret = -errno; | |
279 | } | |
280 | error: | |
281 | return ret; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Spawn the consumerd daemon and session daemon thread. | |
286 | */ | |
287 | static int start_consumerd(struct consumer_data *consumer_data) | |
288 | { | |
289 | int ret; | |
290 | ||
291 | /* | |
292 | * Set the listen() state on the socket since there is a possible race | |
293 | * between the exec() of the consumer daemon and this call if place in the | |
294 | * consumer thread. See bug #366 for more details. | |
295 | */ | |
296 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
297 | if (ret < 0) { | |
298 | goto error; | |
299 | } | |
300 | ||
301 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
302 | if (consumer_data->pid != 0) { | |
303 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
304 | goto end; | |
305 | } | |
306 | ||
307 | ret = spawn_consumerd(consumer_data); | |
308 | if (ret < 0) { | |
309 | ERR("Spawning consumerd failed"); | |
310 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
311 | goto error; | |
312 | } | |
313 | ||
314 | /* Setting up the consumer_data pid */ | |
315 | consumer_data->pid = ret; | |
316 | DBG2("Consumer pid %d", consumer_data->pid); | |
317 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
318 | ||
319 | DBG2("Spawning consumer control thread"); | |
320 | ret = spawn_consumer_thread(consumer_data); | |
321 | if (ret < 0) { | |
322 | ERR("Fatal error spawning consumer control thread"); | |
323 | goto error; | |
324 | } | |
325 | ||
326 | end: | |
327 | return 0; | |
328 | ||
329 | error: | |
330 | /* Cleanup already created sockets on error. */ | |
331 | if (consumer_data->err_sock >= 0) { | |
332 | int err; | |
333 | ||
334 | err = close(consumer_data->err_sock); | |
335 | if (err < 0) { | |
336 | PERROR("close consumer data error socket"); | |
337 | } | |
338 | } | |
339 | return ret; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Copy consumer output from the tracing session to the domain session. The | |
344 | * function also applies the right modification on a per domain basis for the | |
345 | * trace files destination directory. | |
346 | * | |
347 | * Should *NOT* be called with RCU read-side lock held. | |
348 | */ | |
349 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
350 | { | |
351 | int ret; | |
352 | const char *dir_name; | |
353 | struct consumer_output *consumer; | |
354 | ||
355 | assert(session); | |
356 | assert(session->consumer); | |
357 | ||
358 | switch (domain) { | |
359 | case LTTNG_DOMAIN_KERNEL: | |
360 | DBG3("Copying tracing session consumer output in kernel session"); | |
361 | /* | |
362 | * XXX: We should audit the session creation and what this function | |
363 | * does "extra" in order to avoid a destroy since this function is used | |
364 | * in the domain session creation (kernel and ust) only. Same for UST | |
365 | * domain. | |
366 | */ | |
367 | if (session->kernel_session->consumer) { | |
368 | consumer_output_put(session->kernel_session->consumer); | |
369 | } | |
370 | session->kernel_session->consumer = | |
371 | consumer_copy_output(session->consumer); | |
372 | /* Ease our life a bit for the next part */ | |
373 | consumer = session->kernel_session->consumer; | |
374 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
375 | break; | |
376 | case LTTNG_DOMAIN_JUL: | |
377 | case LTTNG_DOMAIN_LOG4J: | |
378 | case LTTNG_DOMAIN_PYTHON: | |
379 | case LTTNG_DOMAIN_UST: | |
380 | DBG3("Copying tracing session consumer output in UST session"); | |
381 | if (session->ust_session->consumer) { | |
382 | consumer_output_put(session->ust_session->consumer); | |
383 | } | |
384 | session->ust_session->consumer = | |
385 | consumer_copy_output(session->consumer); | |
386 | /* Ease our life a bit for the next part */ | |
387 | consumer = session->ust_session->consumer; | |
388 | dir_name = DEFAULT_UST_TRACE_DIR; | |
389 | break; | |
390 | default: | |
391 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
392 | goto error; | |
393 | } | |
394 | ||
395 | /* Append correct directory to subdir */ | |
b178f53e JG |
396 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
397 | sizeof(consumer->domain_subdir)); | |
398 | if (ret) { | |
399 | ret = LTTNG_ERR_UNK; | |
400 | goto error; | |
401 | } | |
402 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
403 | ret = LTTNG_OK; |
404 | ||
405 | error: | |
406 | return ret; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Create an UST session and add it to the session ust list. | |
411 | * | |
412 | * Should *NOT* be called with RCU read-side lock held. | |
413 | */ | |
414 | static int create_ust_session(struct ltt_session *session, | |
df4f5a87 | 415 | const struct lttng_domain *domain) |
917a718d JG |
416 | { |
417 | int ret; | |
418 | struct ltt_ust_session *lus = NULL; | |
419 | ||
420 | assert(session); | |
421 | assert(domain); | |
422 | assert(session->consumer); | |
423 | ||
424 | switch (domain->type) { | |
425 | case LTTNG_DOMAIN_JUL: | |
426 | case LTTNG_DOMAIN_LOG4J: | |
427 | case LTTNG_DOMAIN_PYTHON: | |
428 | case LTTNG_DOMAIN_UST: | |
429 | break; | |
430 | default: | |
431 | ERR("Unknown UST domain on create session %d", domain->type); | |
432 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
433 | goto error; | |
434 | } | |
435 | ||
436 | DBG("Creating UST session"); | |
437 | ||
438 | lus = trace_ust_create_session(session->id); | |
439 | if (lus == NULL) { | |
440 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
441 | goto error; | |
442 | } | |
443 | ||
444 | lus->uid = session->uid; | |
445 | lus->gid = session->gid; | |
446 | lus->output_traces = session->output_traces; | |
447 | lus->snapshot_mode = session->snapshot_mode; | |
448 | lus->live_timer_interval = session->live_timer; | |
449 | session->ust_session = lus; | |
450 | if (session->shm_path[0]) { | |
451 | strncpy(lus->root_shm_path, session->shm_path, | |
452 | sizeof(lus->root_shm_path)); | |
453 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
454 | strncpy(lus->shm_path, session->shm_path, | |
455 | sizeof(lus->shm_path)); | |
456 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
457 | strncat(lus->shm_path, "/ust", | |
458 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
459 | } | |
460 | /* Copy session output to the newly created UST session */ | |
461 | ret = copy_session_consumer(domain->type, session); | |
462 | if (ret != LTTNG_OK) { | |
463 | goto error; | |
464 | } | |
465 | ||
466 | return LTTNG_OK; | |
467 | ||
468 | error: | |
469 | free(lus); | |
470 | session->ust_session = NULL; | |
471 | return ret; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Create a kernel tracer session then create the default channel. | |
476 | */ | |
477 | static int create_kernel_session(struct ltt_session *session) | |
478 | { | |
479 | int ret; | |
480 | ||
481 | DBG("Creating kernel session"); | |
482 | ||
7d268848 | 483 | ret = kernel_create_session(session); |
917a718d JG |
484 | if (ret < 0) { |
485 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 486 | goto error_create; |
917a718d JG |
487 | } |
488 | ||
489 | /* Code flow safety */ | |
490 | assert(session->kernel_session); | |
491 | ||
492 | /* Copy session output to the newly created Kernel session */ | |
493 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
494 | if (ret != LTTNG_OK) { | |
495 | goto error; | |
496 | } | |
497 | ||
498 | session->kernel_session->uid = session->uid; | |
499 | session->kernel_session->gid = session->gid; | |
500 | session->kernel_session->output_traces = session->output_traces; | |
501 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
502 | ||
503 | return LTTNG_OK; | |
504 | ||
505 | error: | |
506 | trace_kernel_destroy_session(session->kernel_session); | |
507 | session->kernel_session = NULL; | |
5d0a7bcb | 508 | error_create: |
917a718d JG |
509 | return ret; |
510 | } | |
511 | ||
512 | /* | |
513 | * Count number of session permitted by uid/gid. | |
514 | */ | |
515 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
516 | { | |
517 | unsigned int i = 0; | |
518 | struct ltt_session *session; | |
519 | const struct ltt_session_list *session_list = session_get_list(); | |
520 | ||
521 | DBG("Counting number of available session for UID %d GID %d", | |
522 | uid, gid); | |
523 | cds_list_for_each_entry(session, &session_list->head, list) { | |
524 | if (!session_get(session)) { | |
525 | continue; | |
526 | } | |
527 | session_lock(session); | |
528 | /* Only count the sessions the user can control. */ | |
529 | if (session_access_ok(session, uid, gid) && | |
530 | !session->destroyed) { | |
531 | i++; | |
532 | } | |
533 | session_unlock(session); | |
534 | session_put(session); | |
535 | } | |
536 | return i; | |
537 | } | |
538 | ||
539 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
540 | int *sock_error, struct lttng_event *event) | |
541 | { | |
542 | int fd, ret; | |
543 | struct lttng_userspace_probe_location *probe_location; | |
544 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; | |
545 | struct lttng_dynamic_buffer probe_location_buffer; | |
546 | struct lttng_buffer_view buffer_view; | |
547 | ||
548 | /* | |
549 | * Create a buffer to store the serialized version of the probe | |
550 | * location. | |
551 | */ | |
552 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
553 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
554 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
555 | if (ret) { | |
556 | ret = LTTNG_ERR_NOMEM; | |
557 | goto error; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Receive the probe location. | |
562 | */ | |
563 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
564 | probe_location_buffer.size); | |
565 | if (ret <= 0) { | |
566 | DBG("Nothing recv() from client var len data... continuing"); | |
567 | *sock_error = 1; | |
568 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
569 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
570 | goto error; | |
571 | } | |
572 | ||
573 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
574 | &probe_location_buffer, 0, probe_location_buffer.size); | |
575 | ||
576 | /* | |
577 | * Extract the probe location from the serialized version. | |
578 | */ | |
579 | ret = lttng_userspace_probe_location_create_from_buffer( | |
580 | &buffer_view, &probe_location); | |
581 | if (ret < 0) { | |
582 | WARN("Failed to create a userspace probe location from the received buffer"); | |
583 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
584 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
585 | goto error; | |
586 | } | |
587 | ||
588 | /* | |
589 | * Receive the file descriptor to the target binary from the client. | |
590 | */ | |
591 | DBG("Receiving userspace probe target FD from client ..."); | |
592 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
593 | if (ret <= 0) { | |
594 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
595 | *sock_error = 1; | |
596 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
597 | goto error; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Set the file descriptor received from the client through the unix | |
602 | * socket in the probe location. | |
603 | */ | |
604 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
605 | if (!lookup) { | |
606 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
607 | goto error; | |
608 | } | |
609 | ||
610 | /* | |
611 | * From the kernel tracer's perspective, all userspace probe event types | |
612 | * are all the same: a file and an offset. | |
613 | */ | |
614 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
615 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
616 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
617 | probe_location, fd); | |
618 | break; | |
619 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
620 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
621 | probe_location, fd); | |
622 | break; | |
623 | default: | |
624 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
625 | goto error; | |
626 | } | |
627 | ||
628 | if (ret) { | |
629 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
630 | goto error; | |
631 | } | |
632 | ||
633 | /* Attach the probe location to the event. */ | |
634 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
635 | if (ret) { | |
636 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
637 | goto error; | |
638 | } | |
639 | ||
640 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
641 | error: | |
642 | return ret; | |
643 | } | |
644 | ||
917a718d JG |
645 | /* |
646 | * Version of setup_lttng_msg() without command header. | |
647 | */ | |
648 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
649 | void *payload_buf, size_t payload_len) | |
650 | { | |
651 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
652 | } | |
653 | ||
654 | /* | |
655 | * Free memory of a command context structure. | |
656 | */ | |
657 | static void clean_command_ctx(struct command_ctx **cmd_ctx) | |
658 | { | |
659 | DBG("Clean command context structure"); | |
660 | if (*cmd_ctx) { | |
661 | if ((*cmd_ctx)->llm) { | |
662 | free((*cmd_ctx)->llm); | |
663 | } | |
664 | if ((*cmd_ctx)->lsm) { | |
665 | free((*cmd_ctx)->lsm); | |
666 | } | |
667 | free(*cmd_ctx); | |
668 | *cmd_ctx = NULL; | |
669 | } | |
670 | } | |
671 | ||
672 | /* | |
673 | * Check if the current kernel tracer supports the session rotation feature. | |
674 | * Return 1 if it does, 0 otherwise. | |
675 | */ | |
676 | static int check_rotate_compatible(void) | |
677 | { | |
678 | int ret = 1; | |
679 | ||
680 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
681 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
682 | ret = 0; | |
683 | } | |
684 | ||
685 | return ret; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Send data on a unix socket using the liblttsessiondcomm API. | |
690 | * | |
691 | * Return lttcomm error code. | |
692 | */ | |
693 | static int send_unix_sock(int sock, void *buf, size_t len) | |
694 | { | |
695 | /* Check valid length */ | |
696 | if (len == 0) { | |
697 | return -1; | |
698 | } | |
699 | ||
700 | return lttcomm_send_unix_sock(sock, buf, len); | |
701 | } | |
702 | ||
703 | /* | |
704 | * Process the command requested by the lttng client within the command | |
705 | * context structure. This function make sure that the return structure (llm) | |
706 | * is set and ready for transmission before returning. | |
707 | * | |
708 | * Return any error encountered or 0 for success. | |
709 | * | |
710 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
711 | * A command may assume the ownership of the socket, in which case its value |
712 | * should be set to -1. | |
917a718d JG |
713 | * |
714 | * Should *NOT* be called with RCU read-side lock held. | |
715 | */ | |
3e3665b8 | 716 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
917a718d JG |
717 | int *sock_error) |
718 | { | |
719 | int ret = LTTNG_OK; | |
720 | int need_tracing_session = 1; | |
721 | int need_domain; | |
722 | ||
723 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
724 | ||
725 | assert(!rcu_read_ongoing()); | |
726 | ||
727 | *sock_error = 0; | |
728 | ||
729 | switch (cmd_ctx->lsm->cmd_type) { | |
b178f53e | 730 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
731 | case LTTNG_DESTROY_SESSION: |
732 | case LTTNG_LIST_SESSIONS: | |
733 | case LTTNG_LIST_DOMAINS: | |
734 | case LTTNG_START_TRACE: | |
735 | case LTTNG_STOP_TRACE: | |
736 | case LTTNG_DATA_PENDING: | |
737 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
738 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
739 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
740 | case LTTNG_SNAPSHOT_RECORD: | |
741 | case LTTNG_SAVE_SESSION: | |
742 | case LTTNG_SET_SESSION_SHM_PATH: | |
743 | case LTTNG_REGENERATE_METADATA: | |
744 | case LTTNG_REGENERATE_STATEDUMP: | |
745 | case LTTNG_REGISTER_TRIGGER: | |
746 | case LTTNG_UNREGISTER_TRIGGER: | |
747 | case LTTNG_ROTATE_SESSION: | |
748 | case LTTNG_ROTATION_GET_INFO: | |
749 | case LTTNG_ROTATION_SET_SCHEDULE: | |
750 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
022349df | 751 | case LTTNG_CLEAR_SESSION: |
917a718d JG |
752 | need_domain = 0; |
753 | break; | |
754 | default: | |
755 | need_domain = 1; | |
756 | } | |
757 | ||
758 | if (config.no_kernel && need_domain | |
759 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
760 | if (!is_root) { | |
761 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
762 | } else { | |
763 | ret = LTTNG_ERR_KERN_NA; | |
764 | } | |
765 | goto error; | |
766 | } | |
767 | ||
768 | /* Deny register consumer if we already have a spawned consumer. */ | |
769 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
770 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
771 | if (kconsumer_data.pid > 0) { | |
772 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
773 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
774 | goto error; | |
775 | } | |
776 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
777 | } | |
778 | ||
779 | /* | |
780 | * Check for command that don't needs to allocate a returned payload. We do | |
781 | * this here so we don't have to make the call for no payload at each | |
782 | * command. | |
783 | */ | |
784 | switch(cmd_ctx->lsm->cmd_type) { | |
785 | case LTTNG_LIST_SESSIONS: | |
786 | case LTTNG_LIST_TRACEPOINTS: | |
787 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
788 | case LTTNG_LIST_DOMAINS: | |
789 | case LTTNG_LIST_CHANNELS: | |
790 | case LTTNG_LIST_EVENTS: | |
791 | case LTTNG_LIST_SYSCALLS: | |
792 | case LTTNG_LIST_TRACKER_PIDS: | |
793 | case LTTNG_DATA_PENDING: | |
794 | case LTTNG_ROTATE_SESSION: | |
795 | case LTTNG_ROTATION_GET_INFO: | |
796 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
797 | break; | |
798 | default: | |
799 | /* Setup lttng message with no payload */ | |
800 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
801 | if (ret < 0) { | |
802 | /* This label does not try to unlock the session */ | |
803 | goto init_setup_error; | |
804 | } | |
805 | } | |
806 | ||
807 | /* Commands that DO NOT need a session. */ | |
808 | switch (cmd_ctx->lsm->cmd_type) { | |
b178f53e | 809 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
810 | case LTTNG_LIST_SESSIONS: |
811 | case LTTNG_LIST_TRACEPOINTS: | |
812 | case LTTNG_LIST_SYSCALLS: | |
813 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
814 | case LTTNG_SAVE_SESSION: | |
815 | case LTTNG_REGISTER_TRIGGER: | |
816 | case LTTNG_UNREGISTER_TRIGGER: | |
817 | need_tracing_session = 0; | |
818 | break; | |
819 | default: | |
820 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
821 | /* | |
822 | * We keep the session list lock across _all_ commands | |
823 | * for now, because the per-session lock does not | |
824 | * handle teardown properly. | |
825 | */ | |
826 | session_lock_list(); | |
827 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
828 | if (cmd_ctx->session == NULL) { | |
829 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
830 | goto error; | |
831 | } else { | |
832 | /* Acquire lock for the session */ | |
833 | session_lock(cmd_ctx->session); | |
834 | } | |
835 | break; | |
836 | } | |
837 | ||
838 | /* | |
839 | * Commands that need a valid session but should NOT create one if none | |
840 | * exists. Instead of creating one and destroying it when the command is | |
841 | * handled, process that right before so we save some round trip in useless | |
842 | * code path. | |
843 | */ | |
844 | switch (cmd_ctx->lsm->cmd_type) { | |
845 | case LTTNG_DISABLE_CHANNEL: | |
846 | case LTTNG_DISABLE_EVENT: | |
847 | switch (cmd_ctx->lsm->domain.type) { | |
848 | case LTTNG_DOMAIN_KERNEL: | |
849 | if (!cmd_ctx->session->kernel_session) { | |
850 | ret = LTTNG_ERR_NO_CHANNEL; | |
851 | goto error; | |
852 | } | |
853 | break; | |
854 | case LTTNG_DOMAIN_JUL: | |
855 | case LTTNG_DOMAIN_LOG4J: | |
856 | case LTTNG_DOMAIN_PYTHON: | |
857 | case LTTNG_DOMAIN_UST: | |
858 | if (!cmd_ctx->session->ust_session) { | |
859 | ret = LTTNG_ERR_NO_CHANNEL; | |
860 | goto error; | |
861 | } | |
862 | break; | |
863 | default: | |
864 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
865 | goto error; | |
866 | } | |
867 | default: | |
868 | break; | |
869 | } | |
870 | ||
871 | if (!need_domain) { | |
872 | goto skip_domain; | |
873 | } | |
874 | ||
875 | /* | |
876 | * Check domain type for specific "pre-action". | |
877 | */ | |
878 | switch (cmd_ctx->lsm->domain.type) { | |
879 | case LTTNG_DOMAIN_KERNEL: | |
880 | if (!is_root) { | |
881 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
882 | goto error; | |
883 | } | |
884 | ||
7d268848 MD |
885 | /* Kernel tracer check */ |
886 | if (!kernel_tracer_is_initialized()) { | |
887 | /* Basically, load kernel tracer modules */ | |
888 | ret = init_kernel_tracer(); | |
889 | if (ret != 0) { | |
890 | goto error; | |
891 | } | |
892 | } | |
893 | ||
917a718d JG |
894 | /* Consumer is in an ERROR state. Report back to client */ |
895 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
896 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
897 | goto error; | |
898 | } | |
899 | ||
900 | /* Need a session for kernel command */ | |
901 | if (need_tracing_session) { | |
902 | if (cmd_ctx->session->kernel_session == NULL) { | |
903 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 904 | if (ret != LTTNG_OK) { |
917a718d JG |
905 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
906 | goto error; | |
907 | } | |
908 | } | |
909 | ||
910 | /* Start the kernel consumer daemon */ | |
911 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
912 | if (kconsumer_data.pid == 0 && | |
913 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
914 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
915 | ret = start_consumerd(&kconsumer_data); | |
916 | if (ret < 0) { | |
917 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
918 | goto error; | |
919 | } | |
920 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); | |
921 | } else { | |
922 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
923 | } | |
924 | ||
925 | /* | |
926 | * The consumer was just spawned so we need to add the socket to | |
927 | * the consumer output of the session if exist. | |
928 | */ | |
929 | ret = consumer_create_socket(&kconsumer_data, | |
930 | cmd_ctx->session->kernel_session->consumer); | |
931 | if (ret < 0) { | |
932 | goto error; | |
933 | } | |
934 | } | |
935 | ||
936 | break; | |
937 | case LTTNG_DOMAIN_JUL: | |
938 | case LTTNG_DOMAIN_LOG4J: | |
939 | case LTTNG_DOMAIN_PYTHON: | |
940 | case LTTNG_DOMAIN_UST: | |
941 | { | |
942 | if (!ust_app_supported()) { | |
943 | ret = LTTNG_ERR_NO_UST; | |
944 | goto error; | |
945 | } | |
946 | /* Consumer is in an ERROR state. Report back to client */ | |
947 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
948 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
949 | goto error; | |
950 | } | |
951 | ||
952 | if (need_tracing_session) { | |
953 | /* Create UST session if none exist. */ | |
954 | if (cmd_ctx->session->ust_session == NULL) { | |
955 | ret = create_ust_session(cmd_ctx->session, | |
df4f5a87 | 956 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain)); |
917a718d JG |
957 | if (ret != LTTNG_OK) { |
958 | goto error; | |
959 | } | |
960 | } | |
961 | ||
962 | /* Start the UST consumer daemons */ | |
963 | /* 64-bit */ | |
964 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
965 | if (config.consumerd64_bin_path.value && | |
966 | ustconsumer64_data.pid == 0 && | |
967 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
968 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
969 | ret = start_consumerd(&ustconsumer64_data); | |
970 | if (ret < 0) { | |
971 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
972 | uatomic_set(&ust_consumerd64_fd, -EINVAL); | |
973 | goto error; | |
974 | } | |
975 | ||
976 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); | |
977 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
978 | } else { | |
979 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
980 | } | |
981 | ||
982 | /* | |
983 | * Setup socket for consumer 64 bit. No need for atomic access | |
984 | * since it was set above and can ONLY be set in this thread. | |
985 | */ | |
986 | ret = consumer_create_socket(&ustconsumer64_data, | |
987 | cmd_ctx->session->ust_session->consumer); | |
988 | if (ret < 0) { | |
989 | goto error; | |
990 | } | |
991 | ||
992 | /* 32-bit */ | |
993 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); | |
994 | if (config.consumerd32_bin_path.value && | |
995 | ustconsumer32_data.pid == 0 && | |
996 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
997 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
998 | ret = start_consumerd(&ustconsumer32_data); | |
999 | if (ret < 0) { | |
1000 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
1001 | uatomic_set(&ust_consumerd32_fd, -EINVAL); | |
1002 | goto error; | |
1003 | } | |
1004 | ||
1005 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); | |
1006 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1007 | } else { | |
1008 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * Setup socket for consumer 32 bit. No need for atomic access | |
1013 | * since it was set above and can ONLY be set in this thread. | |
1014 | */ | |
1015 | ret = consumer_create_socket(&ustconsumer32_data, | |
1016 | cmd_ctx->session->ust_session->consumer); | |
1017 | if (ret < 0) { | |
1018 | goto error; | |
1019 | } | |
1020 | } | |
1021 | break; | |
1022 | } | |
1023 | default: | |
1024 | break; | |
1025 | } | |
1026 | skip_domain: | |
1027 | ||
1028 | /* Validate consumer daemon state when start/stop trace command */ | |
1029 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
1030 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
1031 | switch (cmd_ctx->lsm->domain.type) { | |
1032 | case LTTNG_DOMAIN_NONE: | |
1033 | break; | |
1034 | case LTTNG_DOMAIN_JUL: | |
1035 | case LTTNG_DOMAIN_LOG4J: | |
1036 | case LTTNG_DOMAIN_PYTHON: | |
1037 | case LTTNG_DOMAIN_UST: | |
1038 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
1039 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1040 | goto error; | |
1041 | } | |
1042 | break; | |
1043 | case LTTNG_DOMAIN_KERNEL: | |
1044 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
1045 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
1046 | goto error; | |
1047 | } | |
1048 | break; | |
1049 | default: | |
1050 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1051 | goto error; | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Check that the UID or GID match that of the tracing session. | |
1057 | * The root user can interact with all sessions. | |
1058 | */ | |
1059 | if (need_tracing_session) { | |
1060 | if (!session_access_ok(cmd_ctx->session, | |
1061 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1062 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || | |
1063 | cmd_ctx->session->destroyed) { | |
1064 | ret = LTTNG_ERR_EPERM; | |
1065 | goto error; | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * Send relayd information to consumer as soon as we have a domain and a | |
1071 | * session defined. | |
1072 | */ | |
1073 | if (cmd_ctx->session && need_domain) { | |
1074 | /* | |
1075 | * Setup relayd if not done yet. If the relayd information was already | |
1076 | * sent to the consumer, this call will gracefully return. | |
1077 | */ | |
1078 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1079 | if (ret != LTTNG_OK) { | |
1080 | goto error; | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | /* Process by command type */ | |
1085 | switch (cmd_ctx->lsm->cmd_type) { | |
1086 | case LTTNG_ADD_CONTEXT: | |
1087 | { | |
1088 | /* | |
1089 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1090 | * payload if the context being added is an application context. | |
1091 | */ | |
1092 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
1093 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1094 | char *provider_name = NULL, *context_name = NULL; | |
1095 | size_t provider_name_len = | |
1096 | cmd_ctx->lsm->u.context.provider_name_len; | |
1097 | size_t context_name_len = | |
1098 | cmd_ctx->lsm->u.context.context_name_len; | |
1099 | ||
1100 | if (provider_name_len == 0 || context_name_len == 0) { | |
1101 | /* | |
1102 | * Application provider and context names MUST | |
1103 | * be provided. | |
1104 | */ | |
1105 | ret = -LTTNG_ERR_INVALID; | |
1106 | goto error; | |
1107 | } | |
1108 | ||
1109 | provider_name = zmalloc(provider_name_len + 1); | |
1110 | if (!provider_name) { | |
1111 | ret = -LTTNG_ERR_NOMEM; | |
1112 | goto error; | |
1113 | } | |
1114 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = | |
1115 | provider_name; | |
1116 | ||
1117 | context_name = zmalloc(context_name_len + 1); | |
1118 | if (!context_name) { | |
1119 | ret = -LTTNG_ERR_NOMEM; | |
1120 | goto error_add_context; | |
1121 | } | |
1122 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = | |
1123 | context_name; | |
1124 | ||
3e3665b8 | 1125 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
917a718d JG |
1126 | provider_name_len); |
1127 | if (ret < 0) { | |
1128 | goto error_add_context; | |
1129 | } | |
1130 | ||
3e3665b8 | 1131 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
917a718d JG |
1132 | context_name_len); |
1133 | if (ret < 0) { | |
1134 | goto error_add_context; | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * cmd_add_context assumes ownership of the provider and context | |
1140 | * names. | |
1141 | */ | |
1142 | ret = cmd_add_context(cmd_ctx->session, | |
1143 | cmd_ctx->lsm->domain.type, | |
1144 | cmd_ctx->lsm->u.context.channel_name, | |
df4f5a87 | 1145 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.context.ctx), |
917a718d JG |
1146 | kernel_poll_pipe[1]); |
1147 | ||
1148 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
1149 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
1150 | error_add_context: | |
1151 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
1152 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
1153 | if (ret < 0) { | |
1154 | goto error; | |
1155 | } | |
1156 | break; | |
1157 | } | |
1158 | case LTTNG_DISABLE_CHANNEL: | |
1159 | { | |
1160 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1161 | cmd_ctx->lsm->u.disable.channel_name); | |
1162 | break; | |
1163 | } | |
1164 | case LTTNG_DISABLE_EVENT: | |
1165 | { | |
1166 | ||
1167 | /* | |
1168 | * FIXME: handle filter; for now we just receive the filter's | |
1169 | * bytecode along with the filter expression which are sent by | |
1170 | * liblttng-ctl and discard them. | |
1171 | * | |
1172 | * This fixes an issue where the client may block while sending | |
1173 | * the filter payload and encounter an error because the session | |
1174 | * daemon closes the socket without ever handling this data. | |
1175 | */ | |
1176 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
1177 | cmd_ctx->lsm->u.disable.bytecode_len; | |
1178 | ||
1179 | if (count) { | |
1180 | char data[LTTNG_FILTER_MAX_LEN]; | |
1181 | ||
1182 | DBG("Discarding disable event command payload of size %zu", count); | |
1183 | while (count) { | |
3e3665b8 | 1184 | ret = lttcomm_recv_unix_sock(*sock, data, |
917a718d JG |
1185 | count > sizeof(data) ? sizeof(data) : count); |
1186 | if (ret < 0) { | |
1187 | goto error; | |
1188 | } | |
1189 | ||
1190 | count -= (size_t) ret; | |
1191 | } | |
1192 | } | |
917a718d JG |
1193 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
1194 | cmd_ctx->lsm->u.disable.channel_name, | |
df4f5a87 | 1195 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.disable.event)); |
917a718d JG |
1196 | break; |
1197 | } | |
1198 | case LTTNG_ENABLE_CHANNEL: | |
1199 | { | |
1200 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = | |
1201 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
df4f5a87 JG |
1202 | ret = cmd_enable_channel(cmd_ctx->session, |
1203 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), | |
1204 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.channel.chan), | |
917a718d JG |
1205 | kernel_poll_pipe[1]); |
1206 | break; | |
1207 | } | |
1208 | case LTTNG_TRACK_PID: | |
1209 | { | |
1210 | ret = cmd_track_pid(cmd_ctx->session, | |
1211 | cmd_ctx->lsm->domain.type, | |
1212 | cmd_ctx->lsm->u.pid_tracker.pid); | |
1213 | break; | |
1214 | } | |
1215 | case LTTNG_UNTRACK_PID: | |
1216 | { | |
1217 | ret = cmd_untrack_pid(cmd_ctx->session, | |
1218 | cmd_ctx->lsm->domain.type, | |
1219 | cmd_ctx->lsm->u.pid_tracker.pid); | |
1220 | break; | |
1221 | } | |
1222 | case LTTNG_ENABLE_EVENT: | |
1223 | { | |
1224 | struct lttng_event *ev = NULL; | |
1225 | struct lttng_event_exclusion *exclusion = NULL; | |
1226 | struct lttng_filter_bytecode *bytecode = NULL; | |
1227 | char *filter_expression = NULL; | |
1228 | ||
1229 | /* Handle exclusion events and receive it from the client. */ | |
1230 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
1231 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
1232 | ||
1233 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1234 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1235 | if (!exclusion) { | |
1236 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1237 | goto error; | |
1238 | } | |
1239 | ||
1240 | DBG("Receiving var len exclusion event list from client ..."); | |
1241 | exclusion->count = count; | |
3e3665b8 | 1242 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
917a718d JG |
1243 | count * LTTNG_SYMBOL_NAME_LEN); |
1244 | if (ret <= 0) { | |
1245 | DBG("Nothing recv() from client var len data... continuing"); | |
1246 | *sock_error = 1; | |
1247 | free(exclusion); | |
1248 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1249 | goto error; | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | /* Get filter expression from client. */ | |
1254 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
1255 | size_t expression_len = | |
1256 | cmd_ctx->lsm->u.enable.expression_len; | |
1257 | ||
1258 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1259 | ret = LTTNG_ERR_FILTER_INVAL; | |
1260 | free(exclusion); | |
1261 | goto error; | |
1262 | } | |
1263 | ||
1264 | filter_expression = zmalloc(expression_len); | |
1265 | if (!filter_expression) { | |
1266 | free(exclusion); | |
1267 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1268 | goto error; | |
1269 | } | |
1270 | ||
1271 | /* Receive var. len. data */ | |
1272 | DBG("Receiving var len filter's expression from client ..."); | |
3e3665b8 | 1273 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
917a718d JG |
1274 | expression_len); |
1275 | if (ret <= 0) { | |
1276 | DBG("Nothing recv() from client var len data... continuing"); | |
1277 | *sock_error = 1; | |
1278 | free(filter_expression); | |
1279 | free(exclusion); | |
1280 | ret = LTTNG_ERR_FILTER_INVAL; | |
1281 | goto error; | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | /* Handle filter and get bytecode from client. */ | |
1286 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
1287 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
1288 | ||
1289 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1290 | ret = LTTNG_ERR_FILTER_INVAL; | |
1291 | free(filter_expression); | |
1292 | free(exclusion); | |
1293 | goto error; | |
1294 | } | |
1295 | ||
1296 | bytecode = zmalloc(bytecode_len); | |
1297 | if (!bytecode) { | |
1298 | free(filter_expression); | |
1299 | free(exclusion); | |
1300 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1301 | goto error; | |
1302 | } | |
1303 | ||
1304 | /* Receive var. len. data */ | |
1305 | DBG("Receiving var len filter's bytecode from client ..."); | |
3e3665b8 | 1306 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
917a718d JG |
1307 | if (ret <= 0) { |
1308 | DBG("Nothing recv() from client var len data... continuing"); | |
1309 | *sock_error = 1; | |
1310 | free(filter_expression); | |
1311 | free(bytecode); | |
1312 | free(exclusion); | |
1313 | ret = LTTNG_ERR_FILTER_INVAL; | |
1314 | goto error; | |
1315 | } | |
1316 | ||
1317 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1318 | free(filter_expression); | |
1319 | free(bytecode); | |
1320 | free(exclusion); | |
1321 | ret = LTTNG_ERR_FILTER_INVAL; | |
1322 | goto error; | |
1323 | } | |
1324 | } | |
1325 | ||
df4f5a87 | 1326 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm->u.enable.event)); |
917a718d JG |
1327 | if (!ev) { |
1328 | DBG("Failed to copy event: %s", | |
1329 | cmd_ctx->lsm->u.enable.event.name); | |
1330 | free(filter_expression); | |
1331 | free(bytecode); | |
1332 | free(exclusion); | |
1333 | ret = LTTNG_ERR_NOMEM; | |
1334 | goto error; | |
1335 | } | |
1336 | ||
1337 | ||
1338 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
1339 | /* Expect a userspace probe description. */ | |
3e3665b8 | 1340 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
917a718d JG |
1341 | if (ret) { |
1342 | free(filter_expression); | |
1343 | free(bytecode); | |
1344 | free(exclusion); | |
1345 | lttng_event_destroy(ev); | |
1346 | goto error; | |
1347 | } | |
1348 | } | |
1349 | ||
df4f5a87 JG |
1350 | ret = cmd_enable_event(cmd_ctx->session, |
1351 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), | |
917a718d JG |
1352 | cmd_ctx->lsm->u.enable.channel_name, |
1353 | ev, | |
1354 | filter_expression, bytecode, exclusion, | |
1355 | kernel_poll_pipe[1]); | |
1356 | lttng_event_destroy(ev); | |
1357 | break; | |
1358 | } | |
1359 | case LTTNG_LIST_TRACEPOINTS: | |
1360 | { | |
1361 | struct lttng_event *events; | |
1362 | ssize_t nb_events; | |
1363 | ||
1364 | session_lock_list(); | |
1365 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); | |
1366 | session_unlock_list(); | |
1367 | if (nb_events < 0) { | |
1368 | /* Return value is a negative lttng_error_code. */ | |
1369 | ret = -nb_events; | |
1370 | goto error; | |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * Setup lttng message with payload size set to the event list size in | |
1375 | * bytes and then copy list into the llm payload. | |
1376 | */ | |
1377 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1378 | sizeof(struct lttng_event) * nb_events); | |
1379 | free(events); | |
1380 | ||
1381 | if (ret < 0) { | |
1382 | goto setup_error; | |
1383 | } | |
1384 | ||
1385 | ret = LTTNG_OK; | |
1386 | break; | |
1387 | } | |
1388 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1389 | { | |
1390 | struct lttng_event_field *fields; | |
1391 | ssize_t nb_fields; | |
1392 | ||
1393 | session_lock_list(); | |
1394 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, | |
1395 | &fields); | |
1396 | session_unlock_list(); | |
1397 | if (nb_fields < 0) { | |
1398 | /* Return value is a negative lttng_error_code. */ | |
1399 | ret = -nb_fields; | |
1400 | goto error; | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Setup lttng message with payload size set to the event list size in | |
1405 | * bytes and then copy list into the llm payload. | |
1406 | */ | |
1407 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1408 | sizeof(struct lttng_event_field) * nb_fields); | |
1409 | free(fields); | |
1410 | ||
1411 | if (ret < 0) { | |
1412 | goto setup_error; | |
1413 | } | |
1414 | ||
1415 | ret = LTTNG_OK; | |
1416 | break; | |
1417 | } | |
1418 | case LTTNG_LIST_SYSCALLS: | |
1419 | { | |
1420 | struct lttng_event *events; | |
1421 | ssize_t nb_events; | |
1422 | ||
1423 | nb_events = cmd_list_syscalls(&events); | |
1424 | if (nb_events < 0) { | |
1425 | /* Return value is a negative lttng_error_code. */ | |
1426 | ret = -nb_events; | |
1427 | goto error; | |
1428 | } | |
1429 | ||
1430 | /* | |
1431 | * Setup lttng message with payload size set to the event list size in | |
1432 | * bytes and then copy list into the llm payload. | |
1433 | */ | |
1434 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1435 | sizeof(struct lttng_event) * nb_events); | |
1436 | free(events); | |
1437 | ||
1438 | if (ret < 0) { | |
1439 | goto setup_error; | |
1440 | } | |
1441 | ||
1442 | ret = LTTNG_OK; | |
1443 | break; | |
1444 | } | |
1445 | case LTTNG_LIST_TRACKER_PIDS: | |
1446 | { | |
1447 | int32_t *pids = NULL; | |
1448 | ssize_t nr_pids; | |
1449 | ||
1450 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
1451 | cmd_ctx->lsm->domain.type, &pids); | |
1452 | if (nr_pids < 0) { | |
1453 | /* Return value is a negative lttng_error_code. */ | |
1454 | ret = -nr_pids; | |
1455 | goto error; | |
1456 | } | |
1457 | ||
1458 | /* | |
1459 | * Setup lttng message with payload size set to the event list size in | |
1460 | * bytes and then copy list into the llm payload. | |
1461 | */ | |
1462 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, | |
1463 | sizeof(int32_t) * nr_pids); | |
1464 | free(pids); | |
1465 | ||
1466 | if (ret < 0) { | |
1467 | goto setup_error; | |
1468 | } | |
1469 | ||
1470 | ret = LTTNG_OK; | |
1471 | break; | |
1472 | } | |
1473 | case LTTNG_SET_CONSUMER_URI: | |
1474 | { | |
1475 | size_t nb_uri, len; | |
1476 | struct lttng_uri *uris; | |
1477 | ||
1478 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
1479 | len = nb_uri * sizeof(struct lttng_uri); | |
1480 | ||
1481 | if (nb_uri == 0) { | |
1482 | ret = LTTNG_ERR_INVALID; | |
1483 | goto error; | |
1484 | } | |
1485 | ||
1486 | uris = zmalloc(len); | |
1487 | if (uris == NULL) { | |
1488 | ret = LTTNG_ERR_FATAL; | |
1489 | goto error; | |
1490 | } | |
1491 | ||
1492 | /* Receive variable len data */ | |
1493 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1494 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1495 | if (ret <= 0) { |
1496 | DBG("No URIs received from client... continuing"); | |
1497 | *sock_error = 1; | |
1498 | ret = LTTNG_ERR_SESSION_FAIL; | |
1499 | free(uris); | |
1500 | goto error; | |
1501 | } | |
1502 | ||
1503 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1504 | free(uris); | |
1505 | if (ret != LTTNG_OK) { | |
1506 | goto error; | |
1507 | } | |
1508 | ||
1509 | ||
1510 | break; | |
1511 | } | |
1512 | case LTTNG_START_TRACE: | |
1513 | { | |
1514 | /* | |
1515 | * On the first start, if we have a kernel session and we have | |
1516 | * enabled time or size-based rotations, we have to make sure | |
1517 | * the kernel tracer supports it. | |
1518 | */ | |
1519 | if (!cmd_ctx->session->has_been_started && \ | |
1520 | cmd_ctx->session->kernel_session && \ | |
1521 | (cmd_ctx->session->rotate_timer_period || \ | |
1522 | cmd_ctx->session->rotate_size) && \ | |
1523 | !check_rotate_compatible()) { | |
1524 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1525 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1526 | goto error; | |
1527 | } | |
1528 | ret = cmd_start_trace(cmd_ctx->session); | |
1529 | break; | |
1530 | } | |
1531 | case LTTNG_STOP_TRACE: | |
1532 | { | |
1533 | ret = cmd_stop_trace(cmd_ctx->session); | |
1534 | break; | |
1535 | } | |
917a718d JG |
1536 | case LTTNG_DESTROY_SESSION: |
1537 | { | |
1538 | ret = cmd_destroy_session(cmd_ctx->session, | |
3e3665b8 JG |
1539 | notification_thread_handle, |
1540 | sock); | |
917a718d JG |
1541 | break; |
1542 | } | |
1543 | case LTTNG_LIST_DOMAINS: | |
1544 | { | |
1545 | ssize_t nb_dom; | |
1546 | struct lttng_domain *domains = NULL; | |
1547 | ||
1548 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1549 | if (nb_dom < 0) { | |
1550 | /* Return value is a negative lttng_error_code. */ | |
1551 | ret = -nb_dom; | |
1552 | goto error; | |
1553 | } | |
1554 | ||
1555 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1556 | nb_dom * sizeof(struct lttng_domain)); | |
1557 | free(domains); | |
1558 | ||
1559 | if (ret < 0) { | |
1560 | goto setup_error; | |
1561 | } | |
1562 | ||
1563 | ret = LTTNG_OK; | |
1564 | break; | |
1565 | } | |
1566 | case LTTNG_LIST_CHANNELS: | |
1567 | { | |
1568 | ssize_t payload_size; | |
1569 | struct lttng_channel *channels = NULL; | |
1570 | ||
1571 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, | |
1572 | cmd_ctx->session, &channels); | |
1573 | if (payload_size < 0) { | |
1574 | /* Return value is a negative lttng_error_code. */ | |
1575 | ret = -payload_size; | |
1576 | goto error; | |
1577 | } | |
1578 | ||
1579 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
1580 | payload_size); | |
1581 | free(channels); | |
1582 | ||
1583 | if (ret < 0) { | |
1584 | goto setup_error; | |
1585 | } | |
1586 | ||
1587 | ret = LTTNG_OK; | |
1588 | break; | |
1589 | } | |
1590 | case LTTNG_LIST_EVENTS: | |
1591 | { | |
1592 | ssize_t nb_event; | |
1593 | struct lttng_event *events = NULL; | |
1594 | struct lttcomm_event_command_header cmd_header; | |
1595 | size_t total_size; | |
1596 | ||
1597 | memset(&cmd_header, 0, sizeof(cmd_header)); | |
1598 | /* Extended infos are included at the end of events */ | |
1599 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
1600 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
1601 | &events, &total_size); | |
1602 | ||
1603 | if (nb_event < 0) { | |
1604 | /* Return value is a negative lttng_error_code. */ | |
1605 | ret = -nb_event; | |
1606 | goto error; | |
1607 | } | |
1608 | ||
1609 | cmd_header.nb_events = nb_event; | |
1610 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
1611 | &cmd_header, sizeof(cmd_header)); | |
1612 | free(events); | |
1613 | ||
1614 | if (ret < 0) { | |
1615 | goto setup_error; | |
1616 | } | |
1617 | ||
1618 | ret = LTTNG_OK; | |
1619 | break; | |
1620 | } | |
1621 | case LTTNG_LIST_SESSIONS: | |
1622 | { | |
1623 | unsigned int nr_sessions; | |
1624 | void *sessions_payload; | |
1625 | size_t payload_len; | |
1626 | ||
1627 | session_lock_list(); | |
1628 | nr_sessions = lttng_sessions_count( | |
1629 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1630 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e JG |
1631 | |
1632 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + | |
1633 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
917a718d JG |
1634 | sessions_payload = zmalloc(payload_len); |
1635 | ||
1636 | if (!sessions_payload) { | |
1637 | session_unlock_list(); | |
1638 | ret = -ENOMEM; | |
1639 | goto setup_error; | |
1640 | } | |
1641 | ||
b178f53e | 1642 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
917a718d JG |
1643 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
1644 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
1645 | session_unlock_list(); | |
1646 | ||
1647 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
1648 | payload_len); | |
1649 | free(sessions_payload); | |
1650 | ||
1651 | if (ret < 0) { | |
1652 | goto setup_error; | |
1653 | } | |
1654 | ||
1655 | ret = LTTNG_OK; | |
1656 | break; | |
1657 | } | |
1658 | case LTTNG_REGISTER_CONSUMER: | |
1659 | { | |
1660 | struct consumer_data *cdata; | |
1661 | ||
1662 | switch (cmd_ctx->lsm->domain.type) { | |
1663 | case LTTNG_DOMAIN_KERNEL: | |
1664 | cdata = &kconsumer_data; | |
1665 | break; | |
1666 | default: | |
1667 | ret = LTTNG_ERR_UND; | |
1668 | goto error; | |
1669 | } | |
1670 | ||
1671 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1672 | cmd_ctx->lsm->u.reg.path, cdata); | |
1673 | break; | |
1674 | } | |
1675 | case LTTNG_DATA_PENDING: | |
1676 | { | |
1677 | int pending_ret; | |
1678 | uint8_t pending_ret_byte; | |
1679 | ||
1680 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
1681 | ||
1682 | /* | |
1683 | * FIXME | |
1684 | * | |
1685 | * This function may returns 0 or 1 to indicate whether or not | |
1686 | * there is data pending. In case of error, it should return an | |
1687 | * LTTNG_ERR code. However, some code paths may still return | |
1688 | * a nondescript error code, which we handle by returning an | |
1689 | * "unknown" error. | |
1690 | */ | |
1691 | if (pending_ret == 0 || pending_ret == 1) { | |
1692 | /* | |
1693 | * ret will be set to LTTNG_OK at the end of | |
1694 | * this function. | |
1695 | */ | |
1696 | } else if (pending_ret < 0) { | |
1697 | ret = LTTNG_ERR_UNK; | |
1698 | goto setup_error; | |
1699 | } else { | |
1700 | ret = pending_ret; | |
1701 | goto setup_error; | |
1702 | } | |
1703 | ||
1704 | pending_ret_byte = (uint8_t) pending_ret; | |
1705 | ||
1706 | /* 1 byte to return whether or not data is pending */ | |
1707 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
1708 | &pending_ret_byte, 1); | |
1709 | ||
1710 | if (ret < 0) { | |
1711 | goto setup_error; | |
1712 | } | |
1713 | ||
1714 | ret = LTTNG_OK; | |
1715 | break; | |
1716 | } | |
1717 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
1718 | { | |
a914e76a | 1719 | uint32_t snapshot_id; |
917a718d JG |
1720 | struct lttcomm_lttng_output_id reply; |
1721 | ||
1722 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
df4f5a87 JG |
1723 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output), |
1724 | &snapshot_id); | |
917a718d JG |
1725 | if (ret != LTTNG_OK) { |
1726 | goto error; | |
1727 | } | |
a914e76a | 1728 | reply.id = snapshot_id; |
917a718d JG |
1729 | |
1730 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
1731 | sizeof(reply)); | |
1732 | if (ret < 0) { | |
1733 | goto setup_error; | |
1734 | } | |
1735 | ||
1736 | /* Copy output list into message payload */ | |
1737 | ret = LTTNG_OK; | |
1738 | break; | |
1739 | } | |
1740 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
1741 | { | |
1742 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
df4f5a87 | 1743 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output)); |
917a718d JG |
1744 | break; |
1745 | } | |
1746 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
1747 | { | |
1748 | ssize_t nb_output; | |
1749 | struct lttng_snapshot_output *outputs = NULL; | |
1750 | ||
1751 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
1752 | if (nb_output < 0) { | |
1753 | ret = -nb_output; | |
1754 | goto error; | |
1755 | } | |
1756 | ||
1757 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
1758 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
1759 | nb_output * sizeof(struct lttng_snapshot_output)); | |
1760 | free(outputs); | |
1761 | ||
1762 | if (ret < 0) { | |
1763 | goto setup_error; | |
1764 | } | |
1765 | ||
1766 | ret = LTTNG_OK; | |
1767 | break; | |
1768 | } | |
1769 | case LTTNG_SNAPSHOT_RECORD: | |
1770 | { | |
1771 | ret = cmd_snapshot_record(cmd_ctx->session, | |
df4f5a87 | 1772 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_record.output), |
917a718d JG |
1773 | cmd_ctx->lsm->u.snapshot_record.wait); |
1774 | break; | |
1775 | } | |
b178f53e | 1776 | case LTTNG_CREATE_SESSION_EXT: |
917a718d | 1777 | { |
b178f53e JG |
1778 | struct lttng_dynamic_buffer payload; |
1779 | struct lttng_session_descriptor *return_descriptor = NULL; | |
917a718d | 1780 | |
b178f53e | 1781 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 1782 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
1783 | if (ret != LTTNG_OK) { |
1784 | goto error; | |
917a718d JG |
1785 | } |
1786 | ||
b178f53e JG |
1787 | ret = lttng_session_descriptor_serialize(return_descriptor, |
1788 | &payload); | |
1789 | if (ret) { | |
1790 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
1791 | lttng_session_descriptor_destroy(return_descriptor); | |
1792 | ret = LTTNG_ERR_NOMEM; | |
1793 | goto error; | |
917a718d | 1794 | } |
b178f53e JG |
1795 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
1796 | payload.size); | |
1797 | if (ret) { | |
1798 | lttng_session_descriptor_destroy(return_descriptor); | |
1799 | ret = LTTNG_ERR_NOMEM; | |
1800 | goto error; | |
1801 | } | |
1802 | lttng_dynamic_buffer_reset(&payload); | |
1803 | lttng_session_descriptor_destroy(return_descriptor); | |
1804 | ret = LTTNG_OK; | |
917a718d JG |
1805 | break; |
1806 | } | |
1807 | case LTTNG_SAVE_SESSION: | |
1808 | { | |
1809 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
1810 | &cmd_ctx->creds); | |
1811 | break; | |
1812 | } | |
1813 | case LTTNG_SET_SESSION_SHM_PATH: | |
1814 | { | |
1815 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
1816 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
1817 | break; | |
1818 | } | |
1819 | case LTTNG_REGENERATE_METADATA: | |
1820 | { | |
1821 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
1822 | break; | |
1823 | } | |
1824 | case LTTNG_REGENERATE_STATEDUMP: | |
1825 | { | |
1826 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
1827 | break; | |
1828 | } | |
1829 | case LTTNG_REGISTER_TRIGGER: | |
1830 | { | |
3e3665b8 | 1831 | ret = cmd_register_trigger(cmd_ctx, *sock, |
917a718d JG |
1832 | notification_thread_handle); |
1833 | break; | |
1834 | } | |
1835 | case LTTNG_UNREGISTER_TRIGGER: | |
1836 | { | |
3e3665b8 | 1837 | ret = cmd_unregister_trigger(cmd_ctx, *sock, |
917a718d JG |
1838 | notification_thread_handle); |
1839 | break; | |
1840 | } | |
1841 | case LTTNG_ROTATE_SESSION: | |
1842 | { | |
1843 | struct lttng_rotate_session_return rotate_return; | |
1844 | ||
1845 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
1846 | ||
1847 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
1848 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
1849 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1850 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1851 | goto error; | |
1852 | } | |
1853 | ||
7fdbed1c | 1854 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
343defc2 MD |
1855 | false, |
1856 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
917a718d JG |
1857 | if (ret < 0) { |
1858 | ret = -ret; | |
1859 | goto error; | |
1860 | } | |
1861 | ||
1862 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
1863 | sizeof(rotate_return)); | |
1864 | if (ret < 0) { | |
1865 | ret = -ret; | |
1866 | goto error; | |
1867 | } | |
1868 | ||
1869 | ret = LTTNG_OK; | |
1870 | break; | |
1871 | } | |
1872 | case LTTNG_ROTATION_GET_INFO: | |
1873 | { | |
1874 | struct lttng_rotation_get_info_return get_info_return; | |
1875 | ||
1876 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
1877 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
1878 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
1879 | if (ret < 0) { | |
1880 | ret = -ret; | |
1881 | goto error; | |
1882 | } | |
1883 | ||
1884 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
1885 | sizeof(get_info_return)); | |
1886 | if (ret < 0) { | |
1887 | ret = -ret; | |
1888 | goto error; | |
1889 | } | |
1890 | ||
1891 | ret = LTTNG_OK; | |
1892 | break; | |
1893 | } | |
1894 | case LTTNG_ROTATION_SET_SCHEDULE: | |
1895 | { | |
1896 | bool set_schedule; | |
1897 | enum lttng_rotation_schedule_type schedule_type; | |
1898 | uint64_t value; | |
1899 | ||
1900 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
1901 | DBG("Kernel tracer version does not support session rotations"); | |
1902 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1903 | goto error; | |
1904 | } | |
1905 | ||
1906 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; | |
1907 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
1908 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
1909 | ||
1910 | ret = cmd_rotation_set_schedule(cmd_ctx->session, | |
1911 | set_schedule, | |
1912 | schedule_type, | |
1913 | value, | |
1914 | notification_thread_handle); | |
1915 | if (ret != LTTNG_OK) { | |
1916 | goto error; | |
1917 | } | |
1918 | ||
1919 | break; | |
1920 | } | |
1921 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
1922 | { | |
1923 | struct lttng_session_list_schedules_return schedules = { | |
1924 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
1925 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
1926 | .size.set = !!cmd_ctx->session->rotate_size, | |
1927 | .size.value = cmd_ctx->session->rotate_size, | |
1928 | }; | |
1929 | ||
1930 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
1931 | sizeof(schedules)); | |
1932 | if (ret < 0) { | |
1933 | ret = -ret; | |
1934 | goto error; | |
1935 | } | |
1936 | ||
1937 | ret = LTTNG_OK; | |
1938 | break; | |
1939 | } | |
022349df MD |
1940 | case LTTNG_CLEAR_SESSION: |
1941 | { | |
1942 | ret = cmd_clear_session(cmd_ctx->session, sock); | |
1943 | break; | |
1944 | } | |
917a718d JG |
1945 | default: |
1946 | ret = LTTNG_ERR_UND; | |
1947 | break; | |
1948 | } | |
1949 | ||
1950 | error: | |
1951 | if (cmd_ctx->llm == NULL) { | |
1952 | DBG("Missing llm structure. Allocating one."); | |
1953 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { | |
1954 | goto setup_error; | |
1955 | } | |
1956 | } | |
1957 | /* Set return code */ | |
1958 | cmd_ctx->llm->ret_code = ret; | |
1959 | setup_error: | |
1960 | if (cmd_ctx->session) { | |
1961 | session_unlock(cmd_ctx->session); | |
1962 | session_put(cmd_ctx->session); | |
3e3665b8 | 1963 | cmd_ctx->session = NULL; |
917a718d JG |
1964 | } |
1965 | if (need_tracing_session) { | |
1966 | session_unlock_list(); | |
1967 | } | |
1968 | init_setup_error: | |
1969 | assert(!rcu_read_ongoing()); | |
1970 | return ret; | |
1971 | } | |
1972 | ||
1973 | static int create_client_sock(void) | |
1974 | { | |
1975 | int ret, client_sock; | |
1976 | const mode_t old_umask = umask(0); | |
1977 | ||
1978 | /* Create client tool unix socket */ | |
1979 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); | |
1980 | if (client_sock < 0) { | |
1981 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); | |
1982 | ret = -1; | |
1983 | goto end; | |
1984 | } | |
1985 | ||
1986 | /* Set the cloexec flag */ | |
1987 | ret = utils_set_fd_cloexec(client_sock); | |
1988 | if (ret < 0) { | |
1989 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
1990 | "Continuing but note that the consumer daemon will have a " | |
1991 | "reference to this socket on exec()", client_sock); | |
1992 | } | |
1993 | ||
1994 | /* File permission MUST be 660 */ | |
1995 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
1996 | if (ret < 0) { | |
18972083 JR |
1997 | ERR("Set file permissions failed: %s", |
1998 | config.client_unix_sock_path.value); | |
917a718d | 1999 | PERROR("chmod"); |
18972083 JR |
2000 | (void) lttcomm_close_unix_sock(client_sock); |
2001 | ret = -1; | |
917a718d JG |
2002 | goto end; |
2003 | } | |
2004 | DBG("Created client socket (fd = %i)", client_sock); | |
2005 | ret = client_sock; | |
2006 | end: | |
2007 | umask(old_umask); | |
2008 | return ret; | |
2009 | } | |
2010 | ||
2011 | static void cleanup_client_thread(void *data) | |
2012 | { | |
2013 | struct lttng_pipe *quit_pipe = data; | |
2014 | ||
2015 | lttng_pipe_destroy(quit_pipe); | |
2016 | } | |
2017 | ||
6cb45e93 JG |
2018 | static void thread_init_cleanup(void *data) |
2019 | { | |
2020 | set_thread_status(false); | |
2021 | } | |
2022 | ||
917a718d JG |
2023 | /* |
2024 | * This thread manage all clients request using the unix client socket for | |
2025 | * communication. | |
2026 | */ | |
2027 | static void *thread_manage_clients(void *data) | |
2028 | { | |
2029 | int sock = -1, ret, i, pollfd, err = -1; | |
2030 | int sock_error; | |
2031 | uint32_t revents, nb_fd; | |
2032 | struct command_ctx *cmd_ctx = NULL; | |
2033 | struct lttng_poll_event events; | |
0f68efb6 | 2034 | const int client_sock = thread_state.client_sock; |
917a718d JG |
2035 | struct lttng_pipe *quit_pipe = data; |
2036 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
2037 | ||
2038 | DBG("[thread] Manage client started"); | |
2039 | ||
2040 | is_root = (getuid() == 0); | |
2041 | ||
6cb45e93 | 2042 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2043 | |
2044 | rcu_register_thread(); | |
2045 | ||
2046 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); | |
2047 | ||
2048 | health_code_update(); | |
2049 | ||
2050 | ret = lttcomm_listen_unix_sock(client_sock); | |
2051 | if (ret < 0) { | |
2052 | goto error_listen; | |
2053 | } | |
2054 | ||
2055 | /* | |
2056 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2057 | * more will be added to this poll set. | |
2058 | */ | |
2059 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2060 | if (ret < 0) { | |
2061 | goto error_create_poll; | |
2062 | } | |
2063 | ||
2064 | /* Add the application registration socket */ | |
2065 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2066 | if (ret < 0) { | |
2067 | goto error; | |
2068 | } | |
2069 | ||
2070 | /* Add thread quit pipe */ | |
2071 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2072 | if (ret < 0) { | |
2073 | goto error; | |
2074 | } | |
2075 | ||
6cb45e93 JG |
2076 | /* Set state as running. */ |
2077 | set_thread_status(true); | |
2078 | pthread_cleanup_pop(0); | |
2079 | ||
917a718d JG |
2080 | /* This testpoint is after we signal readiness to the parent. */ |
2081 | if (testpoint(sessiond_thread_manage_clients)) { | |
2082 | goto error; | |
2083 | } | |
2084 | ||
2085 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2086 | goto error; | |
2087 | } | |
2088 | ||
2089 | health_code_update(); | |
2090 | ||
917a718d JG |
2091 | while (1) { |
2092 | const struct cmd_completion_handler *cmd_completion_handler; | |
2093 | ||
2094 | DBG("Accepting client command ..."); | |
2095 | ||
2096 | /* Inifinite blocking call, waiting for transmission */ | |
2097 | restart: | |
2098 | health_poll_entry(); | |
2099 | ret = lttng_poll_wait(&events, -1); | |
2100 | health_poll_exit(); | |
2101 | if (ret < 0) { | |
2102 | /* | |
2103 | * Restart interrupted system call. | |
2104 | */ | |
2105 | if (errno == EINTR) { | |
2106 | goto restart; | |
2107 | } | |
2108 | goto error; | |
2109 | } | |
2110 | ||
2111 | nb_fd = ret; | |
2112 | ||
2113 | for (i = 0; i < nb_fd; i++) { | |
2114 | revents = LTTNG_POLL_GETEV(&events, i); | |
2115 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2116 | ||
2117 | health_code_update(); | |
2118 | ||
917a718d JG |
2119 | if (pollfd == thread_quit_pipe_fd) { |
2120 | err = 0; | |
2121 | goto exit; | |
2122 | } else { | |
2123 | /* Event on the registration socket */ | |
2124 | if (revents & LPOLLIN) { | |
2125 | continue; | |
2126 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2127 | ERR("Client socket poll error"); | |
2128 | goto error; | |
2129 | } else { | |
2130 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2131 | goto error; | |
2132 | } | |
2133 | } | |
2134 | } | |
2135 | ||
2136 | DBG("Wait for client response"); | |
2137 | ||
2138 | health_code_update(); | |
2139 | ||
2140 | sock = lttcomm_accept_unix_sock(client_sock); | |
2141 | if (sock < 0) { | |
2142 | goto error; | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2147 | * show must go on. | |
2148 | */ | |
2149 | (void) utils_set_fd_cloexec(sock); | |
2150 | ||
2151 | /* Set socket option for credentials retrieval */ | |
2152 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2153 | if (ret < 0) { | |
2154 | goto error; | |
2155 | } | |
2156 | ||
2157 | /* Allocate context command to process the client request */ | |
2158 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); | |
2159 | if (cmd_ctx == NULL) { | |
2160 | PERROR("zmalloc cmd_ctx"); | |
2161 | goto error; | |
2162 | } | |
2163 | ||
2164 | /* Allocate data buffer for reception */ | |
2165 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); | |
2166 | if (cmd_ctx->lsm == NULL) { | |
2167 | PERROR("zmalloc cmd_ctx->lsm"); | |
2168 | goto error; | |
2169 | } | |
2170 | ||
2171 | cmd_ctx->llm = NULL; | |
2172 | cmd_ctx->session = NULL; | |
2173 | ||
2174 | health_code_update(); | |
2175 | ||
2176 | /* | |
2177 | * Data is received from the lttng client. The struct | |
2178 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2179 | * the client. | |
2180 | */ | |
2181 | DBG("Receiving data from client ..."); | |
2182 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, | |
2183 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
2184 | if (ret <= 0) { | |
2185 | DBG("Nothing recv() from client... continuing"); | |
2186 | ret = close(sock); | |
2187 | if (ret) { | |
2188 | PERROR("close"); | |
2189 | } | |
2190 | sock = -1; | |
2191 | clean_command_ctx(&cmd_ctx); | |
2192 | continue; | |
2193 | } | |
2194 | ||
2195 | health_code_update(); | |
2196 | ||
2197 | // TODO: Validate cmd_ctx including sanity check for | |
2198 | // security purpose. | |
2199 | ||
2200 | rcu_thread_online(); | |
2201 | /* | |
2202 | * This function dispatch the work to the kernel or userspace tracer | |
2203 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2204 | * informations for the client. The command context struct contains | |
2205 | * everything this function may needs. | |
2206 | */ | |
3e3665b8 | 2207 | ret = process_client_msg(cmd_ctx, &sock, &sock_error); |
917a718d JG |
2208 | rcu_thread_offline(); |
2209 | if (ret < 0) { | |
3e3665b8 JG |
2210 | if (sock >= 0) { |
2211 | ret = close(sock); | |
2212 | if (ret) { | |
2213 | PERROR("close"); | |
2214 | } | |
2215 | } | |
2216 | sock = -1; | |
917a718d JG |
2217 | /* |
2218 | * TODO: Inform client somehow of the fatal error. At | |
2219 | * this point, ret < 0 means that a zmalloc failed | |
2220 | * (ENOMEM). Error detected but still accept | |
2221 | * command, unless a socket error has been | |
2222 | * detected. | |
2223 | */ | |
2224 | clean_command_ctx(&cmd_ctx); | |
2225 | continue; | |
2226 | } | |
2227 | ||
2228 | cmd_completion_handler = cmd_pop_completion_handler(); | |
2229 | if (cmd_completion_handler) { | |
2230 | enum lttng_error_code completion_code; | |
2231 | ||
2232 | completion_code = cmd_completion_handler->run( | |
2233 | cmd_completion_handler->data); | |
2234 | if (completion_code != LTTNG_OK) { | |
2235 | clean_command_ctx(&cmd_ctx); | |
2236 | continue; | |
2237 | } | |
2238 | } | |
2239 | ||
2240 | health_code_update(); | |
2241 | ||
3e3665b8 JG |
2242 | if (sock >= 0) { |
2243 | DBG("Sending response (size: %d, retcode: %s (%d))", | |
2244 | cmd_ctx->lttng_msg_size, | |
2245 | lttng_strerror(-cmd_ctx->llm->ret_code), | |
2246 | cmd_ctx->llm->ret_code); | |
2247 | ret = send_unix_sock(sock, cmd_ctx->llm, | |
2248 | cmd_ctx->lttng_msg_size); | |
2249 | if (ret < 0) { | |
2250 | ERR("Failed to send data back to client"); | |
2251 | } | |
917a718d | 2252 | |
3e3665b8 JG |
2253 | /* End of transmission */ |
2254 | ret = close(sock); | |
2255 | if (ret) { | |
2256 | PERROR("close"); | |
2257 | } | |
2258 | } | |
2259 | sock = -1; | |
917a718d JG |
2260 | |
2261 | clean_command_ctx(&cmd_ctx); | |
2262 | ||
2263 | health_code_update(); | |
2264 | } | |
2265 | ||
2266 | exit: | |
2267 | error: | |
2268 | if (sock >= 0) { | |
2269 | ret = close(sock); | |
2270 | if (ret) { | |
2271 | PERROR("close"); | |
2272 | } | |
2273 | } | |
2274 | ||
2275 | lttng_poll_clean(&events); | |
2276 | clean_command_ctx(&cmd_ctx); | |
2277 | ||
2278 | error_listen: | |
2279 | error_create_poll: | |
2280 | unlink(config.client_unix_sock_path.value); | |
0f68efb6 JG |
2281 | ret = close(client_sock); |
2282 | if (ret) { | |
2283 | PERROR("close"); | |
917a718d JG |
2284 | } |
2285 | ||
2286 | if (err) { | |
2287 | health_error(); | |
2288 | ERR("Health error occurred in %s", __func__); | |
2289 | } | |
2290 | ||
2291 | health_unregister(health_sessiond); | |
2292 | ||
2293 | DBG("Client thread dying"); | |
2294 | ||
2295 | rcu_unregister_thread(); | |
917a718d JG |
2296 | return NULL; |
2297 | } | |
2298 | ||
2299 | static | |
2300 | bool shutdown_client_thread(void *thread_data) | |
2301 | { | |
2302 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2303 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2304 | ||
2305 | return notify_thread_pipe(write_fd) == 1; | |
2306 | } | |
2307 | ||
2308 | struct lttng_thread *launch_client_thread(void) | |
2309 | { | |
6cb45e93 | 2310 | bool thread_running; |
917a718d | 2311 | struct lttng_pipe *client_quit_pipe; |
0f68efb6 JG |
2312 | struct lttng_thread *thread = NULL; |
2313 | int client_sock_fd = -1; | |
917a718d | 2314 | |
6cb45e93 | 2315 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2316 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2317 | if (!client_quit_pipe) { | |
2318 | goto error; | |
2319 | } | |
2320 | ||
0f68efb6 JG |
2321 | client_sock_fd = create_client_sock(); |
2322 | if (client_sock_fd < 0) { | |
2323 | goto error; | |
2324 | } | |
2325 | ||
2326 | thread_state.client_sock = client_sock_fd; | |
917a718d JG |
2327 | thread = lttng_thread_create("Client management", |
2328 | thread_manage_clients, | |
2329 | shutdown_client_thread, | |
2330 | cleanup_client_thread, | |
2331 | client_quit_pipe); | |
2332 | if (!thread) { | |
2333 | goto error; | |
2334 | } | |
0f68efb6 JG |
2335 | /* The client thread now owns the client sock fd and the quit pipe. */ |
2336 | client_sock_fd = -1; | |
2337 | client_quit_pipe = NULL; | |
917a718d JG |
2338 | |
2339 | /* | |
2340 | * This thread is part of the threads that need to be fully | |
2341 | * initialized before the session daemon is marked as "ready". | |
2342 | */ | |
6cb45e93 JG |
2343 | thread_running = wait_thread_status(); |
2344 | if (!thread_running) { | |
0f68efb6 | 2345 | goto error; |
6cb45e93 | 2346 | } |
917a718d JG |
2347 | return thread; |
2348 | error: | |
0f68efb6 JG |
2349 | if (client_sock_fd >= 0) { |
2350 | if (close(client_sock_fd)) { | |
2351 | PERROR("Failed to close client socket"); | |
2352 | } | |
2353 | } | |
2354 | lttng_thread_put(thread); | |
917a718d JG |
2355 | cleanup_client_thread(client_quit_pipe); |
2356 | return NULL; | |
2357 | } |