Commit | Line | Data |
---|---|---|
917a718d | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
917a718d | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
917a718d | 7 | * |
917a718d JG |
8 | */ |
9 | ||
10 | #include <stddef.h> | |
11 | #include <pthread.h> | |
12 | #include <signal.h> | |
13 | #include <sys/stat.h> | |
14 | #include <common/compat/getenv.h> | |
15 | #include <common/unix.h> | |
16 | #include <common/utils.h> | |
17 | #include <lttng/userspace-probe-internal.h> | |
18 | #include <lttng/event-internal.h> | |
b178f53e JG |
19 | #include <lttng/session-internal.h> |
20 | #include <lttng/session-descriptor-internal.h> | |
f19f5c96 | 21 | #include <lttng/tracker-internal.h> |
917a718d JG |
22 | |
23 | #include "client.h" | |
24 | #include "lttng-sessiond.h" | |
25 | #include "cmd.h" | |
26 | #include "kernel.h" | |
27 | #include "save.h" | |
28 | #include "health-sessiond.h" | |
29 | #include "testpoint.h" | |
30 | #include "utils.h" | |
4ec029ed | 31 | #include "manage-consumer.h" |
022349df | 32 | #include "clear.h" |
d3a684ee | 33 | #include "agent-thread.h" |
917a718d JG |
34 | |
35 | static bool is_root; | |
36 | ||
37 | static struct thread_state { | |
6cb45e93 JG |
38 | sem_t ready; |
39 | bool running; | |
0f68efb6 | 40 | int client_sock; |
6cb45e93 JG |
41 | } thread_state; |
42 | ||
43 | static void set_thread_status(bool running) | |
917a718d | 44 | { |
6cb45e93 JG |
45 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
46 | thread_state.running = running; | |
47 | sem_post(&thread_state.ready); | |
917a718d JG |
48 | } |
49 | ||
6cb45e93 | 50 | static bool wait_thread_status(void) |
917a718d | 51 | { |
6cb45e93 JG |
52 | DBG("Waiting for client thread to be ready"); |
53 | sem_wait(&thread_state.ready); | |
54 | if (thread_state.running) { | |
55 | DBG("Client thread is ready"); | |
56 | } else { | |
57 | ERR("Initialization of client thread failed"); | |
917a718d | 58 | } |
6cb45e93 JG |
59 | |
60 | return thread_state.running; | |
917a718d JG |
61 | } |
62 | ||
63 | /* | |
64 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
65 | * right amount of memory and copying the original information from the lsm | |
66 | * structure. | |
67 | * | |
68 | * Return 0 on success, negative value on error. | |
69 | */ | |
70 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
71 | const void *payload_buf, size_t payload_len, | |
72 | const void *cmd_header_buf, size_t cmd_header_len) | |
73 | { | |
74 | int ret = 0; | |
75 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
76 | const size_t cmd_header_offset = header_len; | |
77 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
78 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
79 | ||
99a98ed3 | 80 | free(cmd_ctx->llm); |
917a718d JG |
81 | cmd_ctx->llm = zmalloc(total_msg_size); |
82 | ||
83 | if (cmd_ctx->llm == NULL) { | |
84 | PERROR("zmalloc"); | |
85 | ret = -ENOMEM; | |
86 | goto end; | |
87 | } | |
88 | ||
89 | /* Copy common data */ | |
90 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
91 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; | |
92 | cmd_ctx->llm->cmd_header_size = cmd_header_len; | |
93 | cmd_ctx->llm->data_size = payload_len; | |
94 | cmd_ctx->lttng_msg_size = total_msg_size; | |
95 | ||
96 | /* Copy command header */ | |
97 | if (cmd_header_len) { | |
98 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
99 | cmd_header_len); | |
100 | } | |
101 | ||
102 | /* Copy payload */ | |
103 | if (payload_len) { | |
104 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
105 | payload_len); | |
106 | } | |
107 | ||
108 | end: | |
109 | return ret; | |
110 | } | |
111 | ||
112 | /* | |
113 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 114 | * exec or it will fail. |
917a718d JG |
115 | */ |
116 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
117 | { | |
4ec029ed | 118 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
119 | } |
120 | ||
121 | /* | |
122 | * Fork and exec a consumer daemon (consumerd). | |
123 | * | |
124 | * Return pid if successful else -1. | |
125 | */ | |
126 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
127 | { | |
128 | int ret; | |
129 | pid_t pid; | |
130 | const char *consumer_to_use; | |
131 | const char *verbosity; | |
132 | struct stat st; | |
133 | ||
134 | DBG("Spawning consumerd"); | |
135 | ||
136 | pid = fork(); | |
137 | if (pid == 0) { | |
138 | /* | |
139 | * Exec consumerd. | |
140 | */ | |
141 | if (config.verbose_consumer) { | |
142 | verbosity = "--verbose"; | |
143 | } else if (lttng_opt_quiet) { | |
144 | verbosity = "--quiet"; | |
145 | } else { | |
146 | verbosity = ""; | |
147 | } | |
148 | ||
149 | switch (consumer_data->type) { | |
150 | case LTTNG_CONSUMER_KERNEL: | |
151 | /* | |
152 | * Find out which consumerd to execute. We will first try the | |
153 | * 64-bit path, then the sessiond's installation directory, and | |
154 | * fallback on the 32-bit one, | |
155 | */ | |
156 | DBG3("Looking for a kernel consumer at these locations:"); | |
157 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); | |
158 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); | |
159 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); | |
160 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { | |
161 | DBG3("Found location #1"); | |
162 | consumer_to_use = config.consumerd64_bin_path.value; | |
163 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
164 | DBG3("Found location #2"); | |
165 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
166 | } else if (config.consumerd32_bin_path.value && | |
167 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
168 | DBG3("Found location #3"); | |
169 | consumer_to_use = config.consumerd32_bin_path.value; | |
170 | } else { | |
171 | DBG("Could not find any valid consumerd executable"); | |
172 | ret = -EINVAL; | |
173 | goto error; | |
174 | } | |
175 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
176 | (void) execl(consumer_to_use, | |
177 | "lttng-consumerd", verbosity, "-k", | |
178 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
179 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
180 | "--group", config.tracing_group_name.value, | |
181 | NULL); | |
182 | break; | |
183 | case LTTNG_CONSUMER64_UST: | |
184 | { | |
185 | if (config.consumerd64_lib_dir.value) { | |
d3a684ee | 186 | const char *tmp; |
917a718d JG |
187 | size_t tmplen; |
188 | char *tmpnew; | |
189 | ||
190 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
191 | if (!tmp) { | |
192 | tmp = ""; | |
193 | } | |
194 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
195 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
196 | if (!tmpnew) { | |
197 | ret = -ENOMEM; | |
198 | goto error; | |
199 | } | |
200 | strcat(tmpnew, config.consumerd64_lib_dir.value); | |
201 | if (tmp[0] != '\0') { | |
202 | strcat(tmpnew, ":"); | |
203 | strcat(tmpnew, tmp); | |
204 | } | |
205 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
206 | free(tmpnew); | |
207 | if (ret) { | |
208 | ret = -errno; | |
209 | goto error; | |
210 | } | |
211 | } | |
212 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); | |
213 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
214 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
215 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
216 | "--group", config.tracing_group_name.value, | |
217 | NULL); | |
218 | break; | |
219 | } | |
220 | case LTTNG_CONSUMER32_UST: | |
221 | { | |
222 | if (config.consumerd32_lib_dir.value) { | |
d3a684ee | 223 | const char *tmp; |
917a718d JG |
224 | size_t tmplen; |
225 | char *tmpnew; | |
226 | ||
227 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
228 | if (!tmp) { | |
229 | tmp = ""; | |
230 | } | |
231 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
232 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
233 | if (!tmpnew) { | |
234 | ret = -ENOMEM; | |
235 | goto error; | |
236 | } | |
237 | strcat(tmpnew, config.consumerd32_lib_dir.value); | |
238 | if (tmp[0] != '\0') { | |
239 | strcat(tmpnew, ":"); | |
240 | strcat(tmpnew, tmp); | |
241 | } | |
242 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
243 | free(tmpnew); | |
244 | if (ret) { | |
245 | ret = -errno; | |
246 | goto error; | |
247 | } | |
248 | } | |
249 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); | |
250 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
251 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
252 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
253 | "--group", config.tracing_group_name.value, | |
254 | NULL); | |
255 | break; | |
256 | } | |
257 | default: | |
258 | ERR("unknown consumer type"); | |
259 | errno = 0; | |
260 | } | |
261 | if (errno != 0) { | |
262 | PERROR("Consumer execl()"); | |
263 | } | |
264 | /* Reaching this point, we got a failure on our execl(). */ | |
265 | exit(EXIT_FAILURE); | |
266 | } else if (pid > 0) { | |
267 | ret = pid; | |
268 | } else { | |
269 | PERROR("start consumer fork"); | |
270 | ret = -errno; | |
271 | } | |
272 | error: | |
273 | return ret; | |
274 | } | |
275 | ||
276 | /* | |
277 | * Spawn the consumerd daemon and session daemon thread. | |
278 | */ | |
279 | static int start_consumerd(struct consumer_data *consumer_data) | |
280 | { | |
281 | int ret; | |
282 | ||
283 | /* | |
284 | * Set the listen() state on the socket since there is a possible race | |
285 | * between the exec() of the consumer daemon and this call if place in the | |
286 | * consumer thread. See bug #366 for more details. | |
287 | */ | |
288 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
289 | if (ret < 0) { | |
290 | goto error; | |
291 | } | |
292 | ||
293 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
294 | if (consumer_data->pid != 0) { | |
295 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
296 | goto end; | |
297 | } | |
298 | ||
299 | ret = spawn_consumerd(consumer_data); | |
300 | if (ret < 0) { | |
301 | ERR("Spawning consumerd failed"); | |
302 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
303 | goto error; | |
304 | } | |
305 | ||
306 | /* Setting up the consumer_data pid */ | |
307 | consumer_data->pid = ret; | |
308 | DBG2("Consumer pid %d", consumer_data->pid); | |
309 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
310 | ||
311 | DBG2("Spawning consumer control thread"); | |
312 | ret = spawn_consumer_thread(consumer_data); | |
313 | if (ret < 0) { | |
314 | ERR("Fatal error spawning consumer control thread"); | |
315 | goto error; | |
316 | } | |
317 | ||
318 | end: | |
319 | return 0; | |
320 | ||
321 | error: | |
322 | /* Cleanup already created sockets on error. */ | |
323 | if (consumer_data->err_sock >= 0) { | |
324 | int err; | |
325 | ||
326 | err = close(consumer_data->err_sock); | |
327 | if (err < 0) { | |
328 | PERROR("close consumer data error socket"); | |
329 | } | |
330 | } | |
331 | return ret; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Copy consumer output from the tracing session to the domain session. The | |
336 | * function also applies the right modification on a per domain basis for the | |
337 | * trace files destination directory. | |
338 | * | |
339 | * Should *NOT* be called with RCU read-side lock held. | |
340 | */ | |
341 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
342 | { | |
343 | int ret; | |
344 | const char *dir_name; | |
345 | struct consumer_output *consumer; | |
346 | ||
347 | assert(session); | |
348 | assert(session->consumer); | |
349 | ||
350 | switch (domain) { | |
351 | case LTTNG_DOMAIN_KERNEL: | |
352 | DBG3("Copying tracing session consumer output in kernel session"); | |
353 | /* | |
354 | * XXX: We should audit the session creation and what this function | |
355 | * does "extra" in order to avoid a destroy since this function is used | |
356 | * in the domain session creation (kernel and ust) only. Same for UST | |
357 | * domain. | |
358 | */ | |
359 | if (session->kernel_session->consumer) { | |
360 | consumer_output_put(session->kernel_session->consumer); | |
361 | } | |
362 | session->kernel_session->consumer = | |
363 | consumer_copy_output(session->consumer); | |
364 | /* Ease our life a bit for the next part */ | |
365 | consumer = session->kernel_session->consumer; | |
366 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
367 | break; | |
368 | case LTTNG_DOMAIN_JUL: | |
369 | case LTTNG_DOMAIN_LOG4J: | |
370 | case LTTNG_DOMAIN_PYTHON: | |
371 | case LTTNG_DOMAIN_UST: | |
372 | DBG3("Copying tracing session consumer output in UST session"); | |
373 | if (session->ust_session->consumer) { | |
374 | consumer_output_put(session->ust_session->consumer); | |
375 | } | |
376 | session->ust_session->consumer = | |
377 | consumer_copy_output(session->consumer); | |
378 | /* Ease our life a bit for the next part */ | |
379 | consumer = session->ust_session->consumer; | |
380 | dir_name = DEFAULT_UST_TRACE_DIR; | |
381 | break; | |
382 | default: | |
383 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
384 | goto error; | |
385 | } | |
386 | ||
387 | /* Append correct directory to subdir */ | |
b178f53e JG |
388 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
389 | sizeof(consumer->domain_subdir)); | |
390 | if (ret) { | |
391 | ret = LTTNG_ERR_UNK; | |
392 | goto error; | |
393 | } | |
394 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
395 | ret = LTTNG_OK; |
396 | ||
397 | error: | |
398 | return ret; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Create an UST session and add it to the session ust list. | |
403 | * | |
404 | * Should *NOT* be called with RCU read-side lock held. | |
405 | */ | |
406 | static int create_ust_session(struct ltt_session *session, | |
df4f5a87 | 407 | const struct lttng_domain *domain) |
917a718d JG |
408 | { |
409 | int ret; | |
410 | struct ltt_ust_session *lus = NULL; | |
411 | ||
412 | assert(session); | |
413 | assert(domain); | |
414 | assert(session->consumer); | |
415 | ||
416 | switch (domain->type) { | |
417 | case LTTNG_DOMAIN_JUL: | |
418 | case LTTNG_DOMAIN_LOG4J: | |
419 | case LTTNG_DOMAIN_PYTHON: | |
420 | case LTTNG_DOMAIN_UST: | |
421 | break; | |
422 | default: | |
423 | ERR("Unknown UST domain on create session %d", domain->type); | |
424 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
425 | goto error; | |
426 | } | |
427 | ||
428 | DBG("Creating UST session"); | |
429 | ||
430 | lus = trace_ust_create_session(session->id); | |
431 | if (lus == NULL) { | |
432 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
433 | goto error; | |
434 | } | |
435 | ||
436 | lus->uid = session->uid; | |
437 | lus->gid = session->gid; | |
438 | lus->output_traces = session->output_traces; | |
439 | lus->snapshot_mode = session->snapshot_mode; | |
440 | lus->live_timer_interval = session->live_timer; | |
441 | session->ust_session = lus; | |
442 | if (session->shm_path[0]) { | |
443 | strncpy(lus->root_shm_path, session->shm_path, | |
444 | sizeof(lus->root_shm_path)); | |
445 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
446 | strncpy(lus->shm_path, session->shm_path, | |
447 | sizeof(lus->shm_path)); | |
448 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
449 | strncat(lus->shm_path, "/ust", | |
450 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
451 | } | |
452 | /* Copy session output to the newly created UST session */ | |
453 | ret = copy_session_consumer(domain->type, session); | |
454 | if (ret != LTTNG_OK) { | |
455 | goto error; | |
456 | } | |
457 | ||
458 | return LTTNG_OK; | |
459 | ||
460 | error: | |
461 | free(lus); | |
462 | session->ust_session = NULL; | |
463 | return ret; | |
464 | } | |
465 | ||
466 | /* | |
467 | * Create a kernel tracer session then create the default channel. | |
468 | */ | |
469 | static int create_kernel_session(struct ltt_session *session) | |
470 | { | |
471 | int ret; | |
472 | ||
473 | DBG("Creating kernel session"); | |
474 | ||
7d268848 | 475 | ret = kernel_create_session(session); |
917a718d JG |
476 | if (ret < 0) { |
477 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 478 | goto error_create; |
917a718d JG |
479 | } |
480 | ||
481 | /* Code flow safety */ | |
482 | assert(session->kernel_session); | |
483 | ||
484 | /* Copy session output to the newly created Kernel session */ | |
485 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
486 | if (ret != LTTNG_OK) { | |
487 | goto error; | |
488 | } | |
489 | ||
490 | session->kernel_session->uid = session->uid; | |
491 | session->kernel_session->gid = session->gid; | |
492 | session->kernel_session->output_traces = session->output_traces; | |
493 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
494 | ||
495 | return LTTNG_OK; | |
496 | ||
497 | error: | |
498 | trace_kernel_destroy_session(session->kernel_session); | |
499 | session->kernel_session = NULL; | |
5d0a7bcb | 500 | error_create: |
917a718d JG |
501 | return ret; |
502 | } | |
503 | ||
504 | /* | |
505 | * Count number of session permitted by uid/gid. | |
506 | */ | |
507 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
508 | { | |
509 | unsigned int i = 0; | |
510 | struct ltt_session *session; | |
511 | const struct ltt_session_list *session_list = session_get_list(); | |
512 | ||
513 | DBG("Counting number of available session for UID %d GID %d", | |
514 | uid, gid); | |
515 | cds_list_for_each_entry(session, &session_list->head, list) { | |
516 | if (!session_get(session)) { | |
517 | continue; | |
518 | } | |
519 | session_lock(session); | |
520 | /* Only count the sessions the user can control. */ | |
521 | if (session_access_ok(session, uid, gid) && | |
522 | !session->destroyed) { | |
523 | i++; | |
524 | } | |
525 | session_unlock(session); | |
526 | session_put(session); | |
527 | } | |
528 | return i; | |
529 | } | |
530 | ||
531 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
532 | int *sock_error, struct lttng_event *event) | |
533 | { | |
534 | int fd, ret; | |
535 | struct lttng_userspace_probe_location *probe_location; | |
917a718d JG |
536 | struct lttng_dynamic_buffer probe_location_buffer; |
537 | struct lttng_buffer_view buffer_view; | |
538 | ||
539 | /* | |
540 | * Create a buffer to store the serialized version of the probe | |
541 | * location. | |
542 | */ | |
543 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
544 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
545 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
546 | if (ret) { | |
547 | ret = LTTNG_ERR_NOMEM; | |
548 | goto error; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Receive the probe location. | |
553 | */ | |
554 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
555 | probe_location_buffer.size); | |
556 | if (ret <= 0) { | |
557 | DBG("Nothing recv() from client var len data... continuing"); | |
558 | *sock_error = 1; | |
559 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
560 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
561 | goto error; | |
562 | } | |
563 | ||
564 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
565 | &probe_location_buffer, 0, probe_location_buffer.size); | |
566 | ||
567 | /* | |
568 | * Extract the probe location from the serialized version. | |
569 | */ | |
570 | ret = lttng_userspace_probe_location_create_from_buffer( | |
571 | &buffer_view, &probe_location); | |
572 | if (ret < 0) { | |
573 | WARN("Failed to create a userspace probe location from the received buffer"); | |
574 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
575 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
576 | goto error; | |
577 | } | |
578 | ||
579 | /* | |
580 | * Receive the file descriptor to the target binary from the client. | |
581 | */ | |
582 | DBG("Receiving userspace probe target FD from client ..."); | |
583 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
584 | if (ret <= 0) { | |
585 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
586 | *sock_error = 1; | |
587 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
588 | goto error; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Set the file descriptor received from the client through the unix | |
593 | * socket in the probe location. | |
594 | */ | |
d3a684ee | 595 | ret = lttng_userspace_probe_location_set_binary_fd(probe_location, fd); |
917a718d JG |
596 | if (ret) { |
597 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
598 | goto error; | |
599 | } | |
600 | ||
601 | /* Attach the probe location to the event. */ | |
602 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
603 | if (ret) { | |
604 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
605 | goto error; | |
606 | } | |
607 | ||
608 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
609 | error: | |
610 | return ret; | |
611 | } | |
612 | ||
917a718d JG |
613 | /* |
614 | * Version of setup_lttng_msg() without command header. | |
615 | */ | |
616 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
617 | void *payload_buf, size_t payload_len) | |
618 | { | |
619 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
620 | } | |
621 | ||
622 | /* | |
623 | * Free memory of a command context structure. | |
624 | */ | |
625 | static void clean_command_ctx(struct command_ctx **cmd_ctx) | |
626 | { | |
627 | DBG("Clean command context structure"); | |
628 | if (*cmd_ctx) { | |
629 | if ((*cmd_ctx)->llm) { | |
630 | free((*cmd_ctx)->llm); | |
631 | } | |
632 | if ((*cmd_ctx)->lsm) { | |
633 | free((*cmd_ctx)->lsm); | |
634 | } | |
635 | free(*cmd_ctx); | |
636 | *cmd_ctx = NULL; | |
637 | } | |
638 | } | |
639 | ||
640 | /* | |
641 | * Check if the current kernel tracer supports the session rotation feature. | |
642 | * Return 1 if it does, 0 otherwise. | |
643 | */ | |
644 | static int check_rotate_compatible(void) | |
645 | { | |
646 | int ret = 1; | |
647 | ||
648 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
649 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
650 | ret = 0; | |
651 | } | |
652 | ||
653 | return ret; | |
654 | } | |
655 | ||
656 | /* | |
657 | * Send data on a unix socket using the liblttsessiondcomm API. | |
658 | * | |
659 | * Return lttcomm error code. | |
660 | */ | |
661 | static int send_unix_sock(int sock, void *buf, size_t len) | |
662 | { | |
663 | /* Check valid length */ | |
664 | if (len == 0) { | |
665 | return -1; | |
666 | } | |
667 | ||
668 | return lttcomm_send_unix_sock(sock, buf, len); | |
669 | } | |
670 | ||
671 | /* | |
672 | * Process the command requested by the lttng client within the command | |
673 | * context structure. This function make sure that the return structure (llm) | |
674 | * is set and ready for transmission before returning. | |
675 | * | |
676 | * Return any error encountered or 0 for success. | |
677 | * | |
678 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
679 | * A command may assume the ownership of the socket, in which case its value |
680 | * should be set to -1. | |
917a718d JG |
681 | * |
682 | * Should *NOT* be called with RCU read-side lock held. | |
683 | */ | |
3e3665b8 | 684 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
917a718d JG |
685 | int *sock_error) |
686 | { | |
687 | int ret = LTTNG_OK; | |
688 | int need_tracing_session = 1; | |
689 | int need_domain; | |
d3a684ee | 690 | int need_consumerd = 1; |
917a718d JG |
691 | |
692 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
693 | ||
694 | assert(!rcu_read_ongoing()); | |
695 | ||
696 | *sock_error = 0; | |
697 | ||
698 | switch (cmd_ctx->lsm->cmd_type) { | |
b178f53e | 699 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
700 | case LTTNG_DESTROY_SESSION: |
701 | case LTTNG_LIST_SESSIONS: | |
702 | case LTTNG_LIST_DOMAINS: | |
703 | case LTTNG_START_TRACE: | |
704 | case LTTNG_STOP_TRACE: | |
705 | case LTTNG_DATA_PENDING: | |
706 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
707 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
708 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
709 | case LTTNG_SNAPSHOT_RECORD: | |
710 | case LTTNG_SAVE_SESSION: | |
711 | case LTTNG_SET_SESSION_SHM_PATH: | |
712 | case LTTNG_REGENERATE_METADATA: | |
713 | case LTTNG_REGENERATE_STATEDUMP: | |
917a718d JG |
714 | case LTTNG_ROTATE_SESSION: |
715 | case LTTNG_ROTATION_GET_INFO: | |
716 | case LTTNG_ROTATION_SET_SCHEDULE: | |
717 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
022349df | 718 | case LTTNG_CLEAR_SESSION: |
d3a684ee | 719 | case LTTNG_LIST_TRIGGERS: |
917a718d JG |
720 | need_domain = 0; |
721 | break; | |
722 | default: | |
723 | need_domain = 1; | |
724 | } | |
725 | ||
d3a684ee JR |
726 | /* Needs a functioning consumerd */ |
727 | switch (cmd_ctx->lsm->cmd_type) { | |
728 | case LTTNG_REGISTER_TRIGGER: | |
729 | case LTTNG_UNREGISTER_TRIGGER: | |
730 | need_consumerd = 0; | |
731 | break; | |
732 | default: | |
733 | need_consumerd = 1; | |
734 | break; | |
735 | } | |
736 | ||
917a718d JG |
737 | if (config.no_kernel && need_domain |
738 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
739 | if (!is_root) { | |
740 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
741 | } else { | |
742 | ret = LTTNG_ERR_KERN_NA; | |
743 | } | |
744 | goto error; | |
745 | } | |
746 | ||
747 | /* Deny register consumer if we already have a spawned consumer. */ | |
748 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
749 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
750 | if (kconsumer_data.pid > 0) { | |
751 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
752 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
753 | goto error; | |
754 | } | |
755 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
756 | } | |
757 | ||
758 | /* | |
759 | * Check for command that don't needs to allocate a returned payload. We do | |
760 | * this here so we don't have to make the call for no payload at each | |
761 | * command. | |
762 | */ | |
763 | switch(cmd_ctx->lsm->cmd_type) { | |
764 | case LTTNG_LIST_SESSIONS: | |
765 | case LTTNG_LIST_TRACEPOINTS: | |
766 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
767 | case LTTNG_LIST_DOMAINS: | |
768 | case LTTNG_LIST_CHANNELS: | |
769 | case LTTNG_LIST_EVENTS: | |
770 | case LTTNG_LIST_SYSCALLS: | |
55c9e7ca | 771 | case LTTNG_LIST_TRACKER_IDS: |
917a718d JG |
772 | case LTTNG_DATA_PENDING: |
773 | case LTTNG_ROTATE_SESSION: | |
774 | case LTTNG_ROTATION_GET_INFO: | |
775 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
d3a684ee JR |
776 | case LTTNG_REGISTER_TRIGGER: |
777 | case LTTNG_LIST_TRIGGERS: | |
917a718d JG |
778 | break; |
779 | default: | |
780 | /* Setup lttng message with no payload */ | |
781 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
782 | if (ret < 0) { | |
783 | /* This label does not try to unlock the session */ | |
784 | goto init_setup_error; | |
785 | } | |
786 | } | |
787 | ||
788 | /* Commands that DO NOT need a session. */ | |
789 | switch (cmd_ctx->lsm->cmd_type) { | |
b178f53e | 790 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
791 | case LTTNG_LIST_SESSIONS: |
792 | case LTTNG_LIST_TRACEPOINTS: | |
793 | case LTTNG_LIST_SYSCALLS: | |
794 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
795 | case LTTNG_SAVE_SESSION: | |
796 | case LTTNG_REGISTER_TRIGGER: | |
797 | case LTTNG_UNREGISTER_TRIGGER: | |
d3a684ee | 798 | case LTTNG_LIST_TRIGGERS: |
917a718d JG |
799 | need_tracing_session = 0; |
800 | break; | |
801 | default: | |
802 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
803 | /* | |
804 | * We keep the session list lock across _all_ commands | |
805 | * for now, because the per-session lock does not | |
806 | * handle teardown properly. | |
807 | */ | |
808 | session_lock_list(); | |
809 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
810 | if (cmd_ctx->session == NULL) { | |
811 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
812 | goto error; | |
813 | } else { | |
814 | /* Acquire lock for the session */ | |
815 | session_lock(cmd_ctx->session); | |
816 | } | |
817 | break; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Commands that need a valid session but should NOT create one if none | |
822 | * exists. Instead of creating one and destroying it when the command is | |
823 | * handled, process that right before so we save some round trip in useless | |
824 | * code path. | |
825 | */ | |
826 | switch (cmd_ctx->lsm->cmd_type) { | |
827 | case LTTNG_DISABLE_CHANNEL: | |
828 | case LTTNG_DISABLE_EVENT: | |
829 | switch (cmd_ctx->lsm->domain.type) { | |
830 | case LTTNG_DOMAIN_KERNEL: | |
831 | if (!cmd_ctx->session->kernel_session) { | |
832 | ret = LTTNG_ERR_NO_CHANNEL; | |
833 | goto error; | |
834 | } | |
835 | break; | |
836 | case LTTNG_DOMAIN_JUL: | |
837 | case LTTNG_DOMAIN_LOG4J: | |
838 | case LTTNG_DOMAIN_PYTHON: | |
839 | case LTTNG_DOMAIN_UST: | |
840 | if (!cmd_ctx->session->ust_session) { | |
841 | ret = LTTNG_ERR_NO_CHANNEL; | |
842 | goto error; | |
843 | } | |
844 | break; | |
845 | default: | |
846 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
847 | goto error; | |
848 | } | |
849 | default: | |
850 | break; | |
851 | } | |
852 | ||
853 | if (!need_domain) { | |
854 | goto skip_domain; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Check domain type for specific "pre-action". | |
859 | */ | |
860 | switch (cmd_ctx->lsm->domain.type) { | |
861 | case LTTNG_DOMAIN_KERNEL: | |
862 | if (!is_root) { | |
863 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
864 | goto error; | |
865 | } | |
866 | ||
7d268848 MD |
867 | /* Kernel tracer check */ |
868 | if (!kernel_tracer_is_initialized()) { | |
869 | /* Basically, load kernel tracer modules */ | |
870 | ret = init_kernel_tracer(); | |
871 | if (ret != 0) { | |
872 | goto error; | |
873 | } | |
874 | } | |
875 | ||
917a718d | 876 | /* Consumer is in an ERROR state. Report back to client */ |
d3a684ee JR |
877 | if (need_consumerd && uatomic_read(&kernel_consumerd_state) == |
878 | CONSUMER_ERROR) { | |
917a718d JG |
879 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
880 | goto error; | |
881 | } | |
882 | ||
883 | /* Need a session for kernel command */ | |
884 | if (need_tracing_session) { | |
885 | if (cmd_ctx->session->kernel_session == NULL) { | |
886 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 887 | if (ret != LTTNG_OK) { |
917a718d JG |
888 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
889 | goto error; | |
890 | } | |
891 | } | |
892 | ||
893 | /* Start the kernel consumer daemon */ | |
894 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
895 | if (kconsumer_data.pid == 0 && | |
896 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
897 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
898 | ret = start_consumerd(&kconsumer_data); | |
899 | if (ret < 0) { | |
900 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
901 | goto error; | |
902 | } | |
903 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); | |
904 | } else { | |
905 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
906 | } | |
907 | ||
908 | /* | |
909 | * The consumer was just spawned so we need to add the socket to | |
910 | * the consumer output of the session if exist. | |
911 | */ | |
912 | ret = consumer_create_socket(&kconsumer_data, | |
913 | cmd_ctx->session->kernel_session->consumer); | |
914 | if (ret < 0) { | |
915 | goto error; | |
916 | } | |
917 | } | |
918 | ||
919 | break; | |
920 | case LTTNG_DOMAIN_JUL: | |
921 | case LTTNG_DOMAIN_LOG4J: | |
922 | case LTTNG_DOMAIN_PYTHON: | |
d3a684ee JR |
923 | if (!agent_tracing_is_enabled()) { |
924 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
925 | goto error; | |
926 | } | |
927 | /* Fallthrough */ | |
917a718d JG |
928 | case LTTNG_DOMAIN_UST: |
929 | { | |
930 | if (!ust_app_supported()) { | |
931 | ret = LTTNG_ERR_NO_UST; | |
932 | goto error; | |
933 | } | |
d3a684ee | 934 | |
917a718d | 935 | /* Consumer is in an ERROR state. Report back to client */ |
d3a684ee JR |
936 | if (need_consumerd && uatomic_read(&ust_consumerd_state) == |
937 | CONSUMER_ERROR) { | |
917a718d JG |
938 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
939 | goto error; | |
940 | } | |
941 | ||
942 | if (need_tracing_session) { | |
943 | /* Create UST session if none exist. */ | |
944 | if (cmd_ctx->session->ust_session == NULL) { | |
945 | ret = create_ust_session(cmd_ctx->session, | |
df4f5a87 | 946 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain)); |
917a718d JG |
947 | if (ret != LTTNG_OK) { |
948 | goto error; | |
949 | } | |
950 | } | |
951 | ||
952 | /* Start the UST consumer daemons */ | |
953 | /* 64-bit */ | |
954 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
955 | if (config.consumerd64_bin_path.value && | |
956 | ustconsumer64_data.pid == 0 && | |
957 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
958 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
959 | ret = start_consumerd(&ustconsumer64_data); | |
960 | if (ret < 0) { | |
961 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
962 | uatomic_set(&ust_consumerd64_fd, -EINVAL); | |
963 | goto error; | |
964 | } | |
965 | ||
966 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); | |
967 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
968 | } else { | |
969 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
970 | } | |
971 | ||
972 | /* | |
973 | * Setup socket for consumer 64 bit. No need for atomic access | |
974 | * since it was set above and can ONLY be set in this thread. | |
975 | */ | |
976 | ret = consumer_create_socket(&ustconsumer64_data, | |
977 | cmd_ctx->session->ust_session->consumer); | |
978 | if (ret < 0) { | |
979 | goto error; | |
980 | } | |
981 | ||
982 | /* 32-bit */ | |
983 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); | |
984 | if (config.consumerd32_bin_path.value && | |
985 | ustconsumer32_data.pid == 0 && | |
986 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
987 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
988 | ret = start_consumerd(&ustconsumer32_data); | |
989 | if (ret < 0) { | |
990 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
991 | uatomic_set(&ust_consumerd32_fd, -EINVAL); | |
992 | goto error; | |
993 | } | |
994 | ||
995 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); | |
996 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
997 | } else { | |
998 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Setup socket for consumer 32 bit. No need for atomic access | |
1003 | * since it was set above and can ONLY be set in this thread. | |
1004 | */ | |
1005 | ret = consumer_create_socket(&ustconsumer32_data, | |
1006 | cmd_ctx->session->ust_session->consumer); | |
1007 | if (ret < 0) { | |
1008 | goto error; | |
1009 | } | |
1010 | } | |
1011 | break; | |
1012 | } | |
1013 | default: | |
1014 | break; | |
1015 | } | |
1016 | skip_domain: | |
1017 | ||
1018 | /* Validate consumer daemon state when start/stop trace command */ | |
1019 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
1020 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
1021 | switch (cmd_ctx->lsm->domain.type) { | |
1022 | case LTTNG_DOMAIN_NONE: | |
1023 | break; | |
1024 | case LTTNG_DOMAIN_JUL: | |
1025 | case LTTNG_DOMAIN_LOG4J: | |
1026 | case LTTNG_DOMAIN_PYTHON: | |
1027 | case LTTNG_DOMAIN_UST: | |
1028 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
1029 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1030 | goto error; | |
1031 | } | |
1032 | break; | |
1033 | case LTTNG_DOMAIN_KERNEL: | |
1034 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
1035 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
1036 | goto error; | |
1037 | } | |
1038 | break; | |
1039 | default: | |
1040 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1041 | goto error; | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * Check that the UID or GID match that of the tracing session. | |
1047 | * The root user can interact with all sessions. | |
1048 | */ | |
1049 | if (need_tracing_session) { | |
1050 | if (!session_access_ok(cmd_ctx->session, | |
1051 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1052 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || | |
1053 | cmd_ctx->session->destroyed) { | |
1054 | ret = LTTNG_ERR_EPERM; | |
1055 | goto error; | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Send relayd information to consumer as soon as we have a domain and a | |
1061 | * session defined. | |
1062 | */ | |
1063 | if (cmd_ctx->session && need_domain) { | |
1064 | /* | |
1065 | * Setup relayd if not done yet. If the relayd information was already | |
1066 | * sent to the consumer, this call will gracefully return. | |
1067 | */ | |
1068 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1069 | if (ret != LTTNG_OK) { | |
1070 | goto error; | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | /* Process by command type */ | |
1075 | switch (cmd_ctx->lsm->cmd_type) { | |
1076 | case LTTNG_ADD_CONTEXT: | |
1077 | { | |
1078 | /* | |
1079 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1080 | * payload if the context being added is an application context. | |
1081 | */ | |
1082 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
1083 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1084 | char *provider_name = NULL, *context_name = NULL; | |
1085 | size_t provider_name_len = | |
1086 | cmd_ctx->lsm->u.context.provider_name_len; | |
1087 | size_t context_name_len = | |
1088 | cmd_ctx->lsm->u.context.context_name_len; | |
1089 | ||
1090 | if (provider_name_len == 0 || context_name_len == 0) { | |
1091 | /* | |
1092 | * Application provider and context names MUST | |
1093 | * be provided. | |
1094 | */ | |
1095 | ret = -LTTNG_ERR_INVALID; | |
1096 | goto error; | |
1097 | } | |
1098 | ||
1099 | provider_name = zmalloc(provider_name_len + 1); | |
1100 | if (!provider_name) { | |
1101 | ret = -LTTNG_ERR_NOMEM; | |
1102 | goto error; | |
1103 | } | |
1104 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = | |
1105 | provider_name; | |
1106 | ||
1107 | context_name = zmalloc(context_name_len + 1); | |
1108 | if (!context_name) { | |
1109 | ret = -LTTNG_ERR_NOMEM; | |
1110 | goto error_add_context; | |
1111 | } | |
1112 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = | |
1113 | context_name; | |
1114 | ||
3e3665b8 | 1115 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
917a718d JG |
1116 | provider_name_len); |
1117 | if (ret < 0) { | |
1118 | goto error_add_context; | |
1119 | } | |
1120 | ||
3e3665b8 | 1121 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
917a718d JG |
1122 | context_name_len); |
1123 | if (ret < 0) { | |
1124 | goto error_add_context; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * cmd_add_context assumes ownership of the provider and context | |
1130 | * names. | |
1131 | */ | |
1132 | ret = cmd_add_context(cmd_ctx->session, | |
1133 | cmd_ctx->lsm->domain.type, | |
1134 | cmd_ctx->lsm->u.context.channel_name, | |
df4f5a87 | 1135 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.context.ctx), |
917a718d JG |
1136 | kernel_poll_pipe[1]); |
1137 | ||
1138 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
1139 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
1140 | error_add_context: | |
1141 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
1142 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
1143 | if (ret < 0) { | |
1144 | goto error; | |
1145 | } | |
1146 | break; | |
1147 | } | |
1148 | case LTTNG_DISABLE_CHANNEL: | |
1149 | { | |
1150 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1151 | cmd_ctx->lsm->u.disable.channel_name); | |
1152 | break; | |
1153 | } | |
1154 | case LTTNG_DISABLE_EVENT: | |
1155 | { | |
1156 | ||
1157 | /* | |
1158 | * FIXME: handle filter; for now we just receive the filter's | |
1159 | * bytecode along with the filter expression which are sent by | |
1160 | * liblttng-ctl and discard them. | |
1161 | * | |
1162 | * This fixes an issue where the client may block while sending | |
1163 | * the filter payload and encounter an error because the session | |
1164 | * daemon closes the socket without ever handling this data. | |
1165 | */ | |
1166 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
1167 | cmd_ctx->lsm->u.disable.bytecode_len; | |
1168 | ||
1169 | if (count) { | |
1170 | char data[LTTNG_FILTER_MAX_LEN]; | |
1171 | ||
1172 | DBG("Discarding disable event command payload of size %zu", count); | |
1173 | while (count) { | |
3e3665b8 | 1174 | ret = lttcomm_recv_unix_sock(*sock, data, |
917a718d JG |
1175 | count > sizeof(data) ? sizeof(data) : count); |
1176 | if (ret < 0) { | |
1177 | goto error; | |
1178 | } | |
1179 | ||
1180 | count -= (size_t) ret; | |
1181 | } | |
1182 | } | |
917a718d JG |
1183 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
1184 | cmd_ctx->lsm->u.disable.channel_name, | |
df4f5a87 | 1185 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.disable.event)); |
917a718d JG |
1186 | break; |
1187 | } | |
1188 | case LTTNG_ENABLE_CHANNEL: | |
1189 | { | |
1190 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = | |
1191 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
df4f5a87 JG |
1192 | ret = cmd_enable_channel(cmd_ctx->session, |
1193 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), | |
1194 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.channel.chan), | |
917a718d JG |
1195 | kernel_poll_pipe[1]); |
1196 | break; | |
1197 | } | |
55c9e7ca | 1198 | case LTTNG_TRACK_ID: |
917a718d | 1199 | { |
2d97a006 JR |
1200 | struct lttng_tracker_id *id = NULL; |
1201 | enum lttng_tracker_id_status status; | |
55c9e7ca | 1202 | |
2d97a006 JR |
1203 | id = lttng_tracker_id_create(); |
1204 | if (!id) { | |
1205 | ret = LTTNG_ERR_NOMEM; | |
1206 | goto error; | |
1207 | } | |
1208 | ||
1209 | switch (cmd_ctx->lsm->u.id_tracker.id_type) { | |
55c9e7ca | 1210 | case LTTNG_ID_ALL: |
2d97a006 | 1211 | status = lttng_tracker_id_set_all(id); |
55c9e7ca JR |
1212 | break; |
1213 | case LTTNG_ID_VALUE: | |
2d97a006 JR |
1214 | status = lttng_tracker_id_set_value( |
1215 | id, cmd_ctx->lsm->u.id_tracker.u.value); | |
55c9e7ca JR |
1216 | break; |
1217 | case LTTNG_ID_STRING: | |
1218 | { | |
1219 | const size_t var_len = cmd_ctx->lsm->u.id_tracker.u.var_len; | |
2d97a006 | 1220 | char *string = NULL; |
55c9e7ca | 1221 | |
2d97a006 JR |
1222 | string = zmalloc(var_len); |
1223 | if (!string) { | |
1224 | lttng_tracker_id_destroy(id); | |
55c9e7ca JR |
1225 | ret = LTTNG_ERR_NOMEM; |
1226 | goto error; | |
1227 | } | |
1228 | DBG("Receiving var len tracker id string from client"); | |
2d97a006 | 1229 | ret = lttcomm_recv_unix_sock(*sock, string, var_len); |
55c9e7ca JR |
1230 | if (ret <= 0) { |
1231 | DBG("Nothing received"); | |
1232 | *sock_error = 1; | |
2d97a006 JR |
1233 | free(string); |
1234 | lttng_tracker_id_destroy(id); | |
55c9e7ca JR |
1235 | ret = LTTNG_ERR_INVALID; |
1236 | goto error; | |
1237 | } | |
2d97a006 | 1238 | if (strnlen(string, var_len) != var_len - 1) { |
55c9e7ca | 1239 | DBG("String received as tracker ID is not NULL-terminated"); |
2d97a006 JR |
1240 | free(string); |
1241 | lttng_tracker_id_destroy(id); | |
55c9e7ca JR |
1242 | ret = LTTNG_ERR_INVALID; |
1243 | goto error; | |
1244 | } | |
2d97a006 JR |
1245 | |
1246 | status = lttng_tracker_id_set_string(id, string); | |
1247 | free(string); | |
55c9e7ca JR |
1248 | break; |
1249 | } | |
1250 | default: | |
2d97a006 | 1251 | lttng_tracker_id_destroy(id); |
55c9e7ca JR |
1252 | ret = LTTNG_ERR_INVALID; |
1253 | goto error; | |
1254 | } | |
2d97a006 JR |
1255 | |
1256 | if (status != LTTNG_TRACKER_ID_STATUS_OK) { | |
1257 | ERR("Invalid value for tracker id"); | |
1258 | ret = LTTNG_ERR_INVALID; | |
1259 | lttng_tracker_id_destroy(id); | |
1260 | goto error; | |
1261 | } | |
1262 | ||
55c9e7ca JR |
1263 | ret = cmd_track_id(cmd_ctx->session, |
1264 | cmd_ctx->lsm->u.id_tracker.tracker_type, | |
2d97a006 JR |
1265 | cmd_ctx->lsm->domain.type, id); |
1266 | lttng_tracker_id_destroy(id); | |
917a718d JG |
1267 | break; |
1268 | } | |
55c9e7ca | 1269 | case LTTNG_UNTRACK_ID: |
917a718d | 1270 | { |
2d97a006 JR |
1271 | struct lttng_tracker_id *id = NULL; |
1272 | enum lttng_tracker_id_status status; | |
1273 | ||
1274 | id = lttng_tracker_id_create(); | |
55c9e7ca | 1275 | |
2d97a006 | 1276 | switch (cmd_ctx->lsm->u.id_tracker.id_type) { |
55c9e7ca | 1277 | case LTTNG_ID_ALL: |
2d97a006 | 1278 | status = lttng_tracker_id_set_all(id); |
55c9e7ca JR |
1279 | break; |
1280 | case LTTNG_ID_VALUE: | |
2d97a006 JR |
1281 | status = lttng_tracker_id_set_value( |
1282 | id, cmd_ctx->lsm->u.id_tracker.u.value); | |
55c9e7ca JR |
1283 | break; |
1284 | case LTTNG_ID_STRING: | |
1285 | { | |
1286 | const size_t var_len = cmd_ctx->lsm->u.id_tracker.u.var_len; | |
2d97a006 | 1287 | char *string = NULL; |
55c9e7ca | 1288 | |
2d97a006 JR |
1289 | string = zmalloc(var_len); |
1290 | if (!string) { | |
55c9e7ca | 1291 | ret = LTTNG_ERR_NOMEM; |
2d97a006 | 1292 | lttng_tracker_id_destroy(id); |
55c9e7ca JR |
1293 | goto error; |
1294 | } | |
1295 | DBG("Receiving var len tracker id string from client"); | |
2d97a006 | 1296 | ret = lttcomm_recv_unix_sock(*sock, string, var_len); |
55c9e7ca JR |
1297 | if (ret <= 0) { |
1298 | DBG("Nothing received"); | |
1299 | *sock_error = 1; | |
2d97a006 JR |
1300 | lttng_tracker_id_destroy(id); |
1301 | free(string); | |
55c9e7ca JR |
1302 | ret = LTTNG_ERR_INVALID; |
1303 | goto error; | |
1304 | } | |
2d97a006 | 1305 | if (strnlen(string, var_len) != var_len - 1) { |
55c9e7ca | 1306 | DBG("String received as tracker ID is not NULL-terminated"); |
2d97a006 JR |
1307 | lttng_tracker_id_destroy(id); |
1308 | free(string); | |
55c9e7ca JR |
1309 | ret = LTTNG_ERR_INVALID; |
1310 | goto error; | |
1311 | } | |
2d97a006 JR |
1312 | status = lttng_tracker_id_set_string(id, string); |
1313 | free(string); | |
55c9e7ca JR |
1314 | break; |
1315 | } | |
1316 | default: | |
2d97a006 | 1317 | lttng_tracker_id_destroy(id); |
55c9e7ca JR |
1318 | ret = LTTNG_ERR_INVALID; |
1319 | goto error; | |
1320 | } | |
2d97a006 JR |
1321 | |
1322 | if (status != LTTNG_TRACKER_ID_STATUS_OK) { | |
1323 | ERR("Invalid tracker id"); | |
1324 | lttng_tracker_id_destroy(id); | |
1325 | ret = LTTNG_ERR_INVALID; | |
1326 | goto error; | |
1327 | } | |
1328 | ||
55c9e7ca JR |
1329 | ret = cmd_untrack_id(cmd_ctx->session, |
1330 | cmd_ctx->lsm->u.id_tracker.tracker_type, | |
2d97a006 JR |
1331 | cmd_ctx->lsm->domain.type, id); |
1332 | lttng_tracker_id_destroy(id); | |
917a718d JG |
1333 | break; |
1334 | } | |
1335 | case LTTNG_ENABLE_EVENT: | |
1336 | { | |
1337 | struct lttng_event *ev = NULL; | |
1338 | struct lttng_event_exclusion *exclusion = NULL; | |
1339 | struct lttng_filter_bytecode *bytecode = NULL; | |
1340 | char *filter_expression = NULL; | |
1341 | ||
1342 | /* Handle exclusion events and receive it from the client. */ | |
1343 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
1344 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
1345 | ||
1346 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1347 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1348 | if (!exclusion) { | |
1349 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1350 | goto error; | |
1351 | } | |
1352 | ||
1353 | DBG("Receiving var len exclusion event list from client ..."); | |
1354 | exclusion->count = count; | |
3e3665b8 | 1355 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
917a718d JG |
1356 | count * LTTNG_SYMBOL_NAME_LEN); |
1357 | if (ret <= 0) { | |
1358 | DBG("Nothing recv() from client var len data... continuing"); | |
1359 | *sock_error = 1; | |
1360 | free(exclusion); | |
1361 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1362 | goto error; | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | /* Get filter expression from client. */ | |
1367 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
1368 | size_t expression_len = | |
1369 | cmd_ctx->lsm->u.enable.expression_len; | |
1370 | ||
1371 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1372 | ret = LTTNG_ERR_FILTER_INVAL; | |
1373 | free(exclusion); | |
1374 | goto error; | |
1375 | } | |
1376 | ||
1377 | filter_expression = zmalloc(expression_len); | |
1378 | if (!filter_expression) { | |
1379 | free(exclusion); | |
1380 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1381 | goto error; | |
1382 | } | |
1383 | ||
1384 | /* Receive var. len. data */ | |
1385 | DBG("Receiving var len filter's expression from client ..."); | |
3e3665b8 | 1386 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
917a718d JG |
1387 | expression_len); |
1388 | if (ret <= 0) { | |
1389 | DBG("Nothing recv() from client var len data... continuing"); | |
1390 | *sock_error = 1; | |
1391 | free(filter_expression); | |
1392 | free(exclusion); | |
1393 | ret = LTTNG_ERR_FILTER_INVAL; | |
1394 | goto error; | |
1395 | } | |
1396 | } | |
1397 | ||
1398 | /* Handle filter and get bytecode from client. */ | |
1399 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
1400 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
1401 | ||
1402 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1403 | ret = LTTNG_ERR_FILTER_INVAL; | |
1404 | free(filter_expression); | |
1405 | free(exclusion); | |
1406 | goto error; | |
1407 | } | |
1408 | ||
1409 | bytecode = zmalloc(bytecode_len); | |
1410 | if (!bytecode) { | |
1411 | free(filter_expression); | |
1412 | free(exclusion); | |
1413 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1414 | goto error; | |
1415 | } | |
1416 | ||
1417 | /* Receive var. len. data */ | |
1418 | DBG("Receiving var len filter's bytecode from client ..."); | |
3e3665b8 | 1419 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
917a718d JG |
1420 | if (ret <= 0) { |
1421 | DBG("Nothing recv() from client var len data... continuing"); | |
1422 | *sock_error = 1; | |
1423 | free(filter_expression); | |
1424 | free(bytecode); | |
1425 | free(exclusion); | |
1426 | ret = LTTNG_ERR_FILTER_INVAL; | |
1427 | goto error; | |
1428 | } | |
1429 | ||
1430 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1431 | free(filter_expression); | |
1432 | free(bytecode); | |
1433 | free(exclusion); | |
1434 | ret = LTTNG_ERR_FILTER_INVAL; | |
1435 | goto error; | |
1436 | } | |
1437 | } | |
1438 | ||
df4f5a87 | 1439 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm->u.enable.event)); |
917a718d JG |
1440 | if (!ev) { |
1441 | DBG("Failed to copy event: %s", | |
1442 | cmd_ctx->lsm->u.enable.event.name); | |
1443 | free(filter_expression); | |
1444 | free(bytecode); | |
1445 | free(exclusion); | |
1446 | ret = LTTNG_ERR_NOMEM; | |
1447 | goto error; | |
1448 | } | |
1449 | ||
1450 | ||
1451 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
1452 | /* Expect a userspace probe description. */ | |
3e3665b8 | 1453 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
917a718d JG |
1454 | if (ret) { |
1455 | free(filter_expression); | |
1456 | free(bytecode); | |
1457 | free(exclusion); | |
1458 | lttng_event_destroy(ev); | |
1459 | goto error; | |
1460 | } | |
1461 | } | |
1462 | ||
df4f5a87 JG |
1463 | ret = cmd_enable_event(cmd_ctx->session, |
1464 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), | |
917a718d JG |
1465 | cmd_ctx->lsm->u.enable.channel_name, |
1466 | ev, | |
1467 | filter_expression, bytecode, exclusion, | |
1468 | kernel_poll_pipe[1]); | |
1469 | lttng_event_destroy(ev); | |
1470 | break; | |
1471 | } | |
1472 | case LTTNG_LIST_TRACEPOINTS: | |
1473 | { | |
1474 | struct lttng_event *events; | |
1475 | ssize_t nb_events; | |
1476 | ||
1477 | session_lock_list(); | |
1478 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); | |
1479 | session_unlock_list(); | |
1480 | if (nb_events < 0) { | |
1481 | /* Return value is a negative lttng_error_code. */ | |
1482 | ret = -nb_events; | |
1483 | goto error; | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Setup lttng message with payload size set to the event list size in | |
1488 | * bytes and then copy list into the llm payload. | |
1489 | */ | |
1490 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1491 | sizeof(struct lttng_event) * nb_events); | |
1492 | free(events); | |
1493 | ||
1494 | if (ret < 0) { | |
1495 | goto setup_error; | |
1496 | } | |
1497 | ||
1498 | ret = LTTNG_OK; | |
1499 | break; | |
1500 | } | |
1501 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1502 | { | |
1503 | struct lttng_event_field *fields; | |
1504 | ssize_t nb_fields; | |
1505 | ||
1506 | session_lock_list(); | |
1507 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, | |
1508 | &fields); | |
1509 | session_unlock_list(); | |
1510 | if (nb_fields < 0) { | |
1511 | /* Return value is a negative lttng_error_code. */ | |
1512 | ret = -nb_fields; | |
1513 | goto error; | |
1514 | } | |
1515 | ||
1516 | /* | |
1517 | * Setup lttng message with payload size set to the event list size in | |
1518 | * bytes and then copy list into the llm payload. | |
1519 | */ | |
1520 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1521 | sizeof(struct lttng_event_field) * nb_fields); | |
1522 | free(fields); | |
1523 | ||
1524 | if (ret < 0) { | |
1525 | goto setup_error; | |
1526 | } | |
1527 | ||
1528 | ret = LTTNG_OK; | |
1529 | break; | |
1530 | } | |
1531 | case LTTNG_LIST_SYSCALLS: | |
1532 | { | |
1533 | struct lttng_event *events; | |
1534 | ssize_t nb_events; | |
1535 | ||
1536 | nb_events = cmd_list_syscalls(&events); | |
1537 | if (nb_events < 0) { | |
1538 | /* Return value is a negative lttng_error_code. */ | |
1539 | ret = -nb_events; | |
1540 | goto error; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Setup lttng message with payload size set to the event list size in | |
1545 | * bytes and then copy list into the llm payload. | |
1546 | */ | |
1547 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1548 | sizeof(struct lttng_event) * nb_events); | |
1549 | free(events); | |
1550 | ||
1551 | if (ret < 0) { | |
1552 | goto setup_error; | |
1553 | } | |
1554 | ||
1555 | ret = LTTNG_OK; | |
1556 | break; | |
1557 | } | |
55c9e7ca | 1558 | case LTTNG_LIST_TRACKER_IDS: |
917a718d | 1559 | { |
55c9e7ca | 1560 | struct lttcomm_tracker_command_header cmd_header; |
a7a533cd | 1561 | struct lttng_tracker_ids *ids = NULL; |
e283e4a0 | 1562 | enum lttng_tracker_id_status status; |
f19f5c96 | 1563 | unsigned int nr_ids; |
55c9e7ca JR |
1564 | struct lttng_dynamic_buffer buf; |
1565 | ||
a7a533cd | 1566 | ret = cmd_list_tracker_ids( |
55c9e7ca JR |
1567 | cmd_ctx->lsm->u.id_tracker.tracker_type, |
1568 | cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1569 | &ids); | |
a7a533cd | 1570 | if (ret != LTTNG_OK) { |
917a718d JG |
1571 | goto error; |
1572 | } | |
1573 | ||
f19f5c96 JR |
1574 | lttng_dynamic_buffer_init(&buf); |
1575 | ||
e283e4a0 JR |
1576 | status = lttng_tracker_ids_get_count(ids, &nr_ids); |
1577 | if (status != LTTNG_TRACKER_ID_STATUS_OK) { | |
f19f5c96 | 1578 | ret = -LTTNG_ERR_INVALID; |
e283e4a0 JR |
1579 | goto error_list_tracker; |
1580 | } | |
1581 | ||
f19f5c96 | 1582 | cmd_header.nb_tracker_id = nr_ids; |
2d97a006 | 1583 | |
f19f5c96 JR |
1584 | ret = lttng_tracker_ids_serialize(ids, &buf); |
1585 | if (ret < 0) { | |
1586 | goto error_list_tracker; | |
55c9e7ca | 1587 | } |
917a718d | 1588 | |
55c9e7ca JR |
1589 | ret = setup_lttng_msg(cmd_ctx, buf.data, buf.size, &cmd_header, |
1590 | sizeof(cmd_header)); | |
2d97a006 | 1591 | error_list_tracker: |
a7a533cd | 1592 | lttng_tracker_ids_destroy(ids); |
55c9e7ca | 1593 | lttng_dynamic_buffer_reset(&buf); |
917a718d | 1594 | if (ret < 0) { |
f19f5c96 | 1595 | goto error; |
917a718d JG |
1596 | } |
1597 | ||
1598 | ret = LTTNG_OK; | |
1599 | break; | |
1600 | } | |
1601 | case LTTNG_SET_CONSUMER_URI: | |
1602 | { | |
1603 | size_t nb_uri, len; | |
1604 | struct lttng_uri *uris; | |
1605 | ||
1606 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
1607 | len = nb_uri * sizeof(struct lttng_uri); | |
1608 | ||
1609 | if (nb_uri == 0) { | |
1610 | ret = LTTNG_ERR_INVALID; | |
1611 | goto error; | |
1612 | } | |
1613 | ||
1614 | uris = zmalloc(len); | |
1615 | if (uris == NULL) { | |
1616 | ret = LTTNG_ERR_FATAL; | |
1617 | goto error; | |
1618 | } | |
1619 | ||
1620 | /* Receive variable len data */ | |
1621 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1622 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1623 | if (ret <= 0) { |
1624 | DBG("No URIs received from client... continuing"); | |
1625 | *sock_error = 1; | |
1626 | ret = LTTNG_ERR_SESSION_FAIL; | |
1627 | free(uris); | |
1628 | goto error; | |
1629 | } | |
1630 | ||
1631 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1632 | free(uris); | |
1633 | if (ret != LTTNG_OK) { | |
1634 | goto error; | |
1635 | } | |
1636 | ||
1637 | ||
1638 | break; | |
1639 | } | |
1640 | case LTTNG_START_TRACE: | |
1641 | { | |
1642 | /* | |
1643 | * On the first start, if we have a kernel session and we have | |
1644 | * enabled time or size-based rotations, we have to make sure | |
1645 | * the kernel tracer supports it. | |
1646 | */ | |
1647 | if (!cmd_ctx->session->has_been_started && \ | |
1648 | cmd_ctx->session->kernel_session && \ | |
1649 | (cmd_ctx->session->rotate_timer_period || \ | |
1650 | cmd_ctx->session->rotate_size) && \ | |
1651 | !check_rotate_compatible()) { | |
1652 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1653 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1654 | goto error; | |
1655 | } | |
1656 | ret = cmd_start_trace(cmd_ctx->session); | |
1657 | break; | |
1658 | } | |
1659 | case LTTNG_STOP_TRACE: | |
1660 | { | |
1661 | ret = cmd_stop_trace(cmd_ctx->session); | |
1662 | break; | |
1663 | } | |
917a718d JG |
1664 | case LTTNG_DESTROY_SESSION: |
1665 | { | |
1666 | ret = cmd_destroy_session(cmd_ctx->session, | |
3e3665b8 JG |
1667 | notification_thread_handle, |
1668 | sock); | |
917a718d JG |
1669 | break; |
1670 | } | |
1671 | case LTTNG_LIST_DOMAINS: | |
1672 | { | |
1673 | ssize_t nb_dom; | |
1674 | struct lttng_domain *domains = NULL; | |
1675 | ||
1676 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1677 | if (nb_dom < 0) { | |
1678 | /* Return value is a negative lttng_error_code. */ | |
1679 | ret = -nb_dom; | |
1680 | goto error; | |
1681 | } | |
1682 | ||
1683 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1684 | nb_dom * sizeof(struct lttng_domain)); | |
1685 | free(domains); | |
1686 | ||
1687 | if (ret < 0) { | |
1688 | goto setup_error; | |
1689 | } | |
1690 | ||
1691 | ret = LTTNG_OK; | |
1692 | break; | |
1693 | } | |
1694 | case LTTNG_LIST_CHANNELS: | |
1695 | { | |
1696 | ssize_t payload_size; | |
1697 | struct lttng_channel *channels = NULL; | |
1698 | ||
1699 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, | |
1700 | cmd_ctx->session, &channels); | |
1701 | if (payload_size < 0) { | |
1702 | /* Return value is a negative lttng_error_code. */ | |
1703 | ret = -payload_size; | |
1704 | goto error; | |
1705 | } | |
1706 | ||
1707 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
1708 | payload_size); | |
1709 | free(channels); | |
1710 | ||
1711 | if (ret < 0) { | |
1712 | goto setup_error; | |
1713 | } | |
1714 | ||
1715 | ret = LTTNG_OK; | |
1716 | break; | |
1717 | } | |
1718 | case LTTNG_LIST_EVENTS: | |
1719 | { | |
1720 | ssize_t nb_event; | |
1721 | struct lttng_event *events = NULL; | |
1722 | struct lttcomm_event_command_header cmd_header; | |
1723 | size_t total_size; | |
1724 | ||
1725 | memset(&cmd_header, 0, sizeof(cmd_header)); | |
1726 | /* Extended infos are included at the end of events */ | |
1727 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
1728 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
1729 | &events, &total_size); | |
1730 | ||
1731 | if (nb_event < 0) { | |
1732 | /* Return value is a negative lttng_error_code. */ | |
1733 | ret = -nb_event; | |
1734 | goto error; | |
1735 | } | |
1736 | ||
1737 | cmd_header.nb_events = nb_event; | |
1738 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
1739 | &cmd_header, sizeof(cmd_header)); | |
1740 | free(events); | |
1741 | ||
1742 | if (ret < 0) { | |
1743 | goto setup_error; | |
1744 | } | |
1745 | ||
1746 | ret = LTTNG_OK; | |
1747 | break; | |
1748 | } | |
1749 | case LTTNG_LIST_SESSIONS: | |
1750 | { | |
1751 | unsigned int nr_sessions; | |
1752 | void *sessions_payload; | |
1753 | size_t payload_len; | |
1754 | ||
1755 | session_lock_list(); | |
1756 | nr_sessions = lttng_sessions_count( | |
1757 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1758 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e JG |
1759 | |
1760 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + | |
1761 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
917a718d JG |
1762 | sessions_payload = zmalloc(payload_len); |
1763 | ||
1764 | if (!sessions_payload) { | |
1765 | session_unlock_list(); | |
1766 | ret = -ENOMEM; | |
1767 | goto setup_error; | |
1768 | } | |
1769 | ||
b178f53e | 1770 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
917a718d JG |
1771 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
1772 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
1773 | session_unlock_list(); | |
1774 | ||
1775 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
1776 | payload_len); | |
1777 | free(sessions_payload); | |
1778 | ||
1779 | if (ret < 0) { | |
1780 | goto setup_error; | |
1781 | } | |
1782 | ||
1783 | ret = LTTNG_OK; | |
1784 | break; | |
1785 | } | |
1786 | case LTTNG_REGISTER_CONSUMER: | |
1787 | { | |
1788 | struct consumer_data *cdata; | |
1789 | ||
1790 | switch (cmd_ctx->lsm->domain.type) { | |
1791 | case LTTNG_DOMAIN_KERNEL: | |
1792 | cdata = &kconsumer_data; | |
1793 | break; | |
1794 | default: | |
1795 | ret = LTTNG_ERR_UND; | |
1796 | goto error; | |
1797 | } | |
1798 | ||
1799 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1800 | cmd_ctx->lsm->u.reg.path, cdata); | |
1801 | break; | |
1802 | } | |
1803 | case LTTNG_DATA_PENDING: | |
1804 | { | |
1805 | int pending_ret; | |
1806 | uint8_t pending_ret_byte; | |
1807 | ||
1808 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
1809 | ||
1810 | /* | |
1811 | * FIXME | |
1812 | * | |
1813 | * This function may returns 0 or 1 to indicate whether or not | |
1814 | * there is data pending. In case of error, it should return an | |
1815 | * LTTNG_ERR code. However, some code paths may still return | |
1816 | * a nondescript error code, which we handle by returning an | |
1817 | * "unknown" error. | |
1818 | */ | |
1819 | if (pending_ret == 0 || pending_ret == 1) { | |
1820 | /* | |
1821 | * ret will be set to LTTNG_OK at the end of | |
1822 | * this function. | |
1823 | */ | |
1824 | } else if (pending_ret < 0) { | |
1825 | ret = LTTNG_ERR_UNK; | |
1826 | goto setup_error; | |
1827 | } else { | |
1828 | ret = pending_ret; | |
1829 | goto setup_error; | |
1830 | } | |
1831 | ||
1832 | pending_ret_byte = (uint8_t) pending_ret; | |
1833 | ||
1834 | /* 1 byte to return whether or not data is pending */ | |
1835 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
1836 | &pending_ret_byte, 1); | |
1837 | ||
1838 | if (ret < 0) { | |
1839 | goto setup_error; | |
1840 | } | |
1841 | ||
1842 | ret = LTTNG_OK; | |
1843 | break; | |
1844 | } | |
1845 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
1846 | { | |
a914e76a | 1847 | uint32_t snapshot_id; |
917a718d JG |
1848 | struct lttcomm_lttng_output_id reply; |
1849 | ||
1850 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
df4f5a87 JG |
1851 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output), |
1852 | &snapshot_id); | |
917a718d JG |
1853 | if (ret != LTTNG_OK) { |
1854 | goto error; | |
1855 | } | |
a914e76a | 1856 | reply.id = snapshot_id; |
917a718d JG |
1857 | |
1858 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
1859 | sizeof(reply)); | |
1860 | if (ret < 0) { | |
1861 | goto setup_error; | |
1862 | } | |
1863 | ||
1864 | /* Copy output list into message payload */ | |
1865 | ret = LTTNG_OK; | |
1866 | break; | |
1867 | } | |
1868 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
1869 | { | |
1870 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
df4f5a87 | 1871 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output)); |
917a718d JG |
1872 | break; |
1873 | } | |
1874 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
1875 | { | |
1876 | ssize_t nb_output; | |
1877 | struct lttng_snapshot_output *outputs = NULL; | |
1878 | ||
1879 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
1880 | if (nb_output < 0) { | |
1881 | ret = -nb_output; | |
1882 | goto error; | |
1883 | } | |
1884 | ||
1885 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
1886 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
1887 | nb_output * sizeof(struct lttng_snapshot_output)); | |
1888 | free(outputs); | |
1889 | ||
1890 | if (ret < 0) { | |
1891 | goto setup_error; | |
1892 | } | |
1893 | ||
1894 | ret = LTTNG_OK; | |
1895 | break; | |
1896 | } | |
1897 | case LTTNG_SNAPSHOT_RECORD: | |
1898 | { | |
1899 | ret = cmd_snapshot_record(cmd_ctx->session, | |
df4f5a87 | 1900 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_record.output), |
917a718d JG |
1901 | cmd_ctx->lsm->u.snapshot_record.wait); |
1902 | break; | |
1903 | } | |
b178f53e | 1904 | case LTTNG_CREATE_SESSION_EXT: |
917a718d | 1905 | { |
b178f53e JG |
1906 | struct lttng_dynamic_buffer payload; |
1907 | struct lttng_session_descriptor *return_descriptor = NULL; | |
917a718d | 1908 | |
b178f53e | 1909 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 1910 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
1911 | if (ret != LTTNG_OK) { |
1912 | goto error; | |
917a718d JG |
1913 | } |
1914 | ||
b178f53e JG |
1915 | ret = lttng_session_descriptor_serialize(return_descriptor, |
1916 | &payload); | |
1917 | if (ret) { | |
1918 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
1919 | lttng_session_descriptor_destroy(return_descriptor); | |
1920 | ret = LTTNG_ERR_NOMEM; | |
1921 | goto error; | |
917a718d | 1922 | } |
b178f53e JG |
1923 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
1924 | payload.size); | |
1925 | if (ret) { | |
1926 | lttng_session_descriptor_destroy(return_descriptor); | |
1927 | ret = LTTNG_ERR_NOMEM; | |
1928 | goto error; | |
1929 | } | |
1930 | lttng_dynamic_buffer_reset(&payload); | |
1931 | lttng_session_descriptor_destroy(return_descriptor); | |
1932 | ret = LTTNG_OK; | |
917a718d JG |
1933 | break; |
1934 | } | |
1935 | case LTTNG_SAVE_SESSION: | |
1936 | { | |
1937 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
1938 | &cmd_ctx->creds); | |
1939 | break; | |
1940 | } | |
1941 | case LTTNG_SET_SESSION_SHM_PATH: | |
1942 | { | |
1943 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
1944 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
1945 | break; | |
1946 | } | |
1947 | case LTTNG_REGENERATE_METADATA: | |
1948 | { | |
1949 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
1950 | break; | |
1951 | } | |
1952 | case LTTNG_REGENERATE_STATEDUMP: | |
1953 | { | |
1954 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
1955 | break; | |
1956 | } | |
1957 | case LTTNG_REGISTER_TRIGGER: | |
1958 | { | |
d3a684ee JR |
1959 | struct lttng_dynamic_buffer payload; |
1960 | struct lttng_trigger *return_trigger; | |
1961 | ||
1962 | lttng_dynamic_buffer_init(&payload); | |
3e3665b8 | 1963 | ret = cmd_register_trigger(cmd_ctx, *sock, |
d3a684ee JR |
1964 | notification_thread_handle, &return_trigger); |
1965 | if (ret != LTTNG_OK) { | |
1966 | goto error; | |
1967 | } | |
1968 | ||
1969 | ret = lttng_trigger_serialize(return_trigger, &payload, NULL); | |
1970 | if (ret) { | |
1971 | ERR("Failed to serialize trigger in reply to \"register trigger\" command"); | |
1972 | ret = LTTNG_ERR_NOMEM; | |
1973 | lttng_trigger_destroy(return_trigger); | |
1974 | goto error; | |
1975 | } | |
1976 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, | |
1977 | payload.size); | |
1978 | if (ret) { | |
1979 | lttng_trigger_destroy(return_trigger); | |
1980 | ret = LTTNG_ERR_NOMEM; | |
1981 | goto error; | |
1982 | } | |
1983 | lttng_trigger_destroy(return_trigger); | |
1984 | lttng_dynamic_buffer_reset(&payload); | |
1985 | ret = LTTNG_OK; | |
917a718d JG |
1986 | break; |
1987 | } | |
1988 | case LTTNG_UNREGISTER_TRIGGER: | |
1989 | { | |
3e3665b8 | 1990 | ret = cmd_unregister_trigger(cmd_ctx, *sock, |
917a718d JG |
1991 | notification_thread_handle); |
1992 | break; | |
1993 | } | |
1994 | case LTTNG_ROTATE_SESSION: | |
1995 | { | |
1996 | struct lttng_rotate_session_return rotate_return; | |
1997 | ||
1998 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
1999 | ||
2000 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
2001 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2002 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2003 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2004 | goto error; | |
2005 | } | |
2006 | ||
7fdbed1c | 2007 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
343defc2 MD |
2008 | false, |
2009 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
917a718d JG |
2010 | if (ret < 0) { |
2011 | ret = -ret; | |
2012 | goto error; | |
2013 | } | |
2014 | ||
2015 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
2016 | sizeof(rotate_return)); | |
2017 | if (ret < 0) { | |
2018 | ret = -ret; | |
2019 | goto error; | |
2020 | } | |
2021 | ||
2022 | ret = LTTNG_OK; | |
2023 | break; | |
2024 | } | |
2025 | case LTTNG_ROTATION_GET_INFO: | |
2026 | { | |
2027 | struct lttng_rotation_get_info_return get_info_return; | |
2028 | ||
2029 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
2030 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
2031 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
2032 | if (ret < 0) { | |
2033 | ret = -ret; | |
2034 | goto error; | |
2035 | } | |
2036 | ||
2037 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
2038 | sizeof(get_info_return)); | |
2039 | if (ret < 0) { | |
2040 | ret = -ret; | |
2041 | goto error; | |
2042 | } | |
2043 | ||
2044 | ret = LTTNG_OK; | |
2045 | break; | |
2046 | } | |
2047 | case LTTNG_ROTATION_SET_SCHEDULE: | |
2048 | { | |
2049 | bool set_schedule; | |
2050 | enum lttng_rotation_schedule_type schedule_type; | |
2051 | uint64_t value; | |
2052 | ||
2053 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2054 | DBG("Kernel tracer version does not support session rotations"); | |
2055 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2056 | goto error; | |
2057 | } | |
2058 | ||
2059 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; | |
2060 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
2061 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
2062 | ||
2063 | ret = cmd_rotation_set_schedule(cmd_ctx->session, | |
2064 | set_schedule, | |
2065 | schedule_type, | |
2066 | value, | |
2067 | notification_thread_handle); | |
2068 | if (ret != LTTNG_OK) { | |
2069 | goto error; | |
2070 | } | |
2071 | ||
2072 | break; | |
2073 | } | |
2074 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
2075 | { | |
2076 | struct lttng_session_list_schedules_return schedules = { | |
2077 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
2078 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
2079 | .size.set = !!cmd_ctx->session->rotate_size, | |
2080 | .size.value = cmd_ctx->session->rotate_size, | |
2081 | }; | |
2082 | ||
2083 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
2084 | sizeof(schedules)); | |
2085 | if (ret < 0) { | |
2086 | ret = -ret; | |
2087 | goto error; | |
2088 | } | |
2089 | ||
2090 | ret = LTTNG_OK; | |
2091 | break; | |
2092 | } | |
022349df MD |
2093 | case LTTNG_CLEAR_SESSION: |
2094 | { | |
2095 | ret = cmd_clear_session(cmd_ctx->session, sock); | |
2096 | break; | |
2097 | } | |
d3a684ee JR |
2098 | case LTTNG_LIST_TRIGGERS: |
2099 | { | |
2100 | struct lttng_dynamic_buffer payload; | |
2101 | struct lttng_triggers *return_triggers; | |
2102 | ||
2103 | lttng_dynamic_buffer_init(&payload); | |
2104 | ret = cmd_list_triggers(cmd_ctx, *sock, | |
2105 | notification_thread_handle, &return_triggers); | |
2106 | if (ret != LTTNG_OK) { | |
2107 | goto error; | |
2108 | } | |
2109 | ||
2110 | ret = lttng_triggers_serialize(return_triggers, &payload); | |
2111 | if (ret) { | |
2112 | ERR("Failed to serialize triggers in reply to \"list triggers\" command"); | |
2113 | ret = LTTNG_ERR_NOMEM; | |
2114 | lttng_triggers_destroy(return_triggers); | |
2115 | goto error; | |
2116 | } | |
2117 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, | |
2118 | payload.size); | |
2119 | if (ret) { | |
2120 | ret = LTTNG_ERR_NOMEM; | |
2121 | lttng_triggers_destroy(return_triggers); | |
2122 | goto error; | |
2123 | } | |
2124 | lttng_dynamic_buffer_reset(&payload); | |
2125 | lttng_triggers_destroy(return_triggers); | |
2126 | ret = LTTNG_OK; | |
2127 | break; | |
2128 | } | |
917a718d JG |
2129 | default: |
2130 | ret = LTTNG_ERR_UND; | |
2131 | break; | |
2132 | } | |
2133 | ||
2134 | error: | |
2135 | if (cmd_ctx->llm == NULL) { | |
2136 | DBG("Missing llm structure. Allocating one."); | |
2137 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { | |
2138 | goto setup_error; | |
2139 | } | |
2140 | } | |
2141 | /* Set return code */ | |
2142 | cmd_ctx->llm->ret_code = ret; | |
2143 | setup_error: | |
2144 | if (cmd_ctx->session) { | |
2145 | session_unlock(cmd_ctx->session); | |
2146 | session_put(cmd_ctx->session); | |
3e3665b8 | 2147 | cmd_ctx->session = NULL; |
917a718d JG |
2148 | } |
2149 | if (need_tracing_session) { | |
2150 | session_unlock_list(); | |
2151 | } | |
2152 | init_setup_error: | |
2153 | assert(!rcu_read_ongoing()); | |
2154 | return ret; | |
2155 | } | |
2156 | ||
2157 | static int create_client_sock(void) | |
2158 | { | |
2159 | int ret, client_sock; | |
2160 | const mode_t old_umask = umask(0); | |
2161 | ||
2162 | /* Create client tool unix socket */ | |
2163 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); | |
2164 | if (client_sock < 0) { | |
2165 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); | |
2166 | ret = -1; | |
2167 | goto end; | |
2168 | } | |
2169 | ||
2170 | /* Set the cloexec flag */ | |
2171 | ret = utils_set_fd_cloexec(client_sock); | |
2172 | if (ret < 0) { | |
2173 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
2174 | "Continuing but note that the consumer daemon will have a " | |
2175 | "reference to this socket on exec()", client_sock); | |
2176 | } | |
2177 | ||
2178 | /* File permission MUST be 660 */ | |
2179 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2180 | if (ret < 0) { | |
18972083 JR |
2181 | ERR("Set file permissions failed: %s", |
2182 | config.client_unix_sock_path.value); | |
917a718d | 2183 | PERROR("chmod"); |
18972083 JR |
2184 | (void) lttcomm_close_unix_sock(client_sock); |
2185 | ret = -1; | |
917a718d JG |
2186 | goto end; |
2187 | } | |
2188 | DBG("Created client socket (fd = %i)", client_sock); | |
2189 | ret = client_sock; | |
2190 | end: | |
2191 | umask(old_umask); | |
2192 | return ret; | |
2193 | } | |
2194 | ||
2195 | static void cleanup_client_thread(void *data) | |
2196 | { | |
2197 | struct lttng_pipe *quit_pipe = data; | |
2198 | ||
2199 | lttng_pipe_destroy(quit_pipe); | |
2200 | } | |
2201 | ||
6cb45e93 JG |
2202 | static void thread_init_cleanup(void *data) |
2203 | { | |
2204 | set_thread_status(false); | |
2205 | } | |
2206 | ||
917a718d JG |
2207 | /* |
2208 | * This thread manage all clients request using the unix client socket for | |
2209 | * communication. | |
2210 | */ | |
2211 | static void *thread_manage_clients(void *data) | |
2212 | { | |
2213 | int sock = -1, ret, i, pollfd, err = -1; | |
2214 | int sock_error; | |
2215 | uint32_t revents, nb_fd; | |
2216 | struct command_ctx *cmd_ctx = NULL; | |
2217 | struct lttng_poll_event events; | |
0f68efb6 | 2218 | const int client_sock = thread_state.client_sock; |
917a718d JG |
2219 | struct lttng_pipe *quit_pipe = data; |
2220 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
2221 | ||
2222 | DBG("[thread] Manage client started"); | |
2223 | ||
2224 | is_root = (getuid() == 0); | |
2225 | ||
6cb45e93 | 2226 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2227 | |
2228 | rcu_register_thread(); | |
2229 | ||
2230 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); | |
2231 | ||
2232 | health_code_update(); | |
2233 | ||
2234 | ret = lttcomm_listen_unix_sock(client_sock); | |
2235 | if (ret < 0) { | |
2236 | goto error_listen; | |
2237 | } | |
2238 | ||
2239 | /* | |
2240 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2241 | * more will be added to this poll set. | |
2242 | */ | |
2243 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2244 | if (ret < 0) { | |
2245 | goto error_create_poll; | |
2246 | } | |
2247 | ||
2248 | /* Add the application registration socket */ | |
2249 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2250 | if (ret < 0) { | |
2251 | goto error; | |
2252 | } | |
2253 | ||
2254 | /* Add thread quit pipe */ | |
2255 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2256 | if (ret < 0) { | |
2257 | goto error; | |
2258 | } | |
2259 | ||
6cb45e93 JG |
2260 | /* Set state as running. */ |
2261 | set_thread_status(true); | |
2262 | pthread_cleanup_pop(0); | |
2263 | ||
917a718d JG |
2264 | /* This testpoint is after we signal readiness to the parent. */ |
2265 | if (testpoint(sessiond_thread_manage_clients)) { | |
2266 | goto error; | |
2267 | } | |
2268 | ||
2269 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2270 | goto error; | |
2271 | } | |
2272 | ||
2273 | health_code_update(); | |
2274 | ||
917a718d JG |
2275 | while (1) { |
2276 | const struct cmd_completion_handler *cmd_completion_handler; | |
2277 | ||
2278 | DBG("Accepting client command ..."); | |
2279 | ||
2280 | /* Inifinite blocking call, waiting for transmission */ | |
2281 | restart: | |
2282 | health_poll_entry(); | |
2283 | ret = lttng_poll_wait(&events, -1); | |
2284 | health_poll_exit(); | |
2285 | if (ret < 0) { | |
2286 | /* | |
2287 | * Restart interrupted system call. | |
2288 | */ | |
2289 | if (errno == EINTR) { | |
2290 | goto restart; | |
2291 | } | |
2292 | goto error; | |
2293 | } | |
2294 | ||
2295 | nb_fd = ret; | |
2296 | ||
2297 | for (i = 0; i < nb_fd; i++) { | |
2298 | revents = LTTNG_POLL_GETEV(&events, i); | |
2299 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2300 | ||
2301 | health_code_update(); | |
2302 | ||
917a718d JG |
2303 | if (pollfd == thread_quit_pipe_fd) { |
2304 | err = 0; | |
2305 | goto exit; | |
2306 | } else { | |
2307 | /* Event on the registration socket */ | |
2308 | if (revents & LPOLLIN) { | |
2309 | continue; | |
2310 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2311 | ERR("Client socket poll error"); | |
2312 | goto error; | |
2313 | } else { | |
2314 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2315 | goto error; | |
2316 | } | |
2317 | } | |
2318 | } | |
2319 | ||
2320 | DBG("Wait for client response"); | |
2321 | ||
2322 | health_code_update(); | |
2323 | ||
2324 | sock = lttcomm_accept_unix_sock(client_sock); | |
2325 | if (sock < 0) { | |
2326 | goto error; | |
2327 | } | |
2328 | ||
2329 | /* | |
2330 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2331 | * show must go on. | |
2332 | */ | |
2333 | (void) utils_set_fd_cloexec(sock); | |
2334 | ||
2335 | /* Set socket option for credentials retrieval */ | |
2336 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2337 | if (ret < 0) { | |
2338 | goto error; | |
2339 | } | |
2340 | ||
2341 | /* Allocate context command to process the client request */ | |
2342 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); | |
2343 | if (cmd_ctx == NULL) { | |
2344 | PERROR("zmalloc cmd_ctx"); | |
2345 | goto error; | |
2346 | } | |
2347 | ||
2348 | /* Allocate data buffer for reception */ | |
2349 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); | |
2350 | if (cmd_ctx->lsm == NULL) { | |
2351 | PERROR("zmalloc cmd_ctx->lsm"); | |
2352 | goto error; | |
2353 | } | |
2354 | ||
2355 | cmd_ctx->llm = NULL; | |
2356 | cmd_ctx->session = NULL; | |
2357 | ||
2358 | health_code_update(); | |
2359 | ||
2360 | /* | |
2361 | * Data is received from the lttng client. The struct | |
2362 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2363 | * the client. | |
2364 | */ | |
2365 | DBG("Receiving data from client ..."); | |
2366 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, | |
2367 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
2368 | if (ret <= 0) { | |
2369 | DBG("Nothing recv() from client... continuing"); | |
2370 | ret = close(sock); | |
2371 | if (ret) { | |
2372 | PERROR("close"); | |
2373 | } | |
2374 | sock = -1; | |
2375 | clean_command_ctx(&cmd_ctx); | |
2376 | continue; | |
2377 | } | |
2378 | ||
2379 | health_code_update(); | |
2380 | ||
2381 | // TODO: Validate cmd_ctx including sanity check for | |
2382 | // security purpose. | |
2383 | ||
2384 | rcu_thread_online(); | |
2385 | /* | |
2386 | * This function dispatch the work to the kernel or userspace tracer | |
2387 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2388 | * informations for the client. The command context struct contains | |
2389 | * everything this function may needs. | |
2390 | */ | |
3e3665b8 | 2391 | ret = process_client_msg(cmd_ctx, &sock, &sock_error); |
917a718d JG |
2392 | rcu_thread_offline(); |
2393 | if (ret < 0) { | |
3e3665b8 JG |
2394 | if (sock >= 0) { |
2395 | ret = close(sock); | |
2396 | if (ret) { | |
2397 | PERROR("close"); | |
2398 | } | |
2399 | } | |
2400 | sock = -1; | |
917a718d JG |
2401 | /* |
2402 | * TODO: Inform client somehow of the fatal error. At | |
2403 | * this point, ret < 0 means that a zmalloc failed | |
2404 | * (ENOMEM). Error detected but still accept | |
2405 | * command, unless a socket error has been | |
2406 | * detected. | |
2407 | */ | |
2408 | clean_command_ctx(&cmd_ctx); | |
2409 | continue; | |
2410 | } | |
2411 | ||
2412 | cmd_completion_handler = cmd_pop_completion_handler(); | |
2413 | if (cmd_completion_handler) { | |
2414 | enum lttng_error_code completion_code; | |
2415 | ||
2416 | completion_code = cmd_completion_handler->run( | |
2417 | cmd_completion_handler->data); | |
2418 | if (completion_code != LTTNG_OK) { | |
2419 | clean_command_ctx(&cmd_ctx); | |
2420 | continue; | |
2421 | } | |
2422 | } | |
2423 | ||
2424 | health_code_update(); | |
2425 | ||
3e3665b8 JG |
2426 | if (sock >= 0) { |
2427 | DBG("Sending response (size: %d, retcode: %s (%d))", | |
2428 | cmd_ctx->lttng_msg_size, | |
2429 | lttng_strerror(-cmd_ctx->llm->ret_code), | |
2430 | cmd_ctx->llm->ret_code); | |
2431 | ret = send_unix_sock(sock, cmd_ctx->llm, | |
2432 | cmd_ctx->lttng_msg_size); | |
2433 | if (ret < 0) { | |
2434 | ERR("Failed to send data back to client"); | |
2435 | } | |
917a718d | 2436 | |
3e3665b8 JG |
2437 | /* End of transmission */ |
2438 | ret = close(sock); | |
2439 | if (ret) { | |
2440 | PERROR("close"); | |
2441 | } | |
2442 | } | |
2443 | sock = -1; | |
917a718d JG |
2444 | |
2445 | clean_command_ctx(&cmd_ctx); | |
2446 | ||
2447 | health_code_update(); | |
2448 | } | |
2449 | ||
2450 | exit: | |
2451 | error: | |
2452 | if (sock >= 0) { | |
2453 | ret = close(sock); | |
2454 | if (ret) { | |
2455 | PERROR("close"); | |
2456 | } | |
2457 | } | |
2458 | ||
2459 | lttng_poll_clean(&events); | |
2460 | clean_command_ctx(&cmd_ctx); | |
2461 | ||
2462 | error_listen: | |
2463 | error_create_poll: | |
2464 | unlink(config.client_unix_sock_path.value); | |
0f68efb6 JG |
2465 | ret = close(client_sock); |
2466 | if (ret) { | |
2467 | PERROR("close"); | |
917a718d JG |
2468 | } |
2469 | ||
2470 | if (err) { | |
2471 | health_error(); | |
2472 | ERR("Health error occurred in %s", __func__); | |
2473 | } | |
2474 | ||
2475 | health_unregister(health_sessiond); | |
2476 | ||
2477 | DBG("Client thread dying"); | |
2478 | ||
2479 | rcu_unregister_thread(); | |
917a718d JG |
2480 | return NULL; |
2481 | } | |
2482 | ||
2483 | static | |
2484 | bool shutdown_client_thread(void *thread_data) | |
2485 | { | |
2486 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2487 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2488 | ||
2489 | return notify_thread_pipe(write_fd) == 1; | |
2490 | } | |
2491 | ||
2492 | struct lttng_thread *launch_client_thread(void) | |
2493 | { | |
6cb45e93 | 2494 | bool thread_running; |
917a718d | 2495 | struct lttng_pipe *client_quit_pipe; |
0f68efb6 JG |
2496 | struct lttng_thread *thread = NULL; |
2497 | int client_sock_fd = -1; | |
917a718d | 2498 | |
6cb45e93 | 2499 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2500 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2501 | if (!client_quit_pipe) { | |
2502 | goto error; | |
2503 | } | |
2504 | ||
0f68efb6 JG |
2505 | client_sock_fd = create_client_sock(); |
2506 | if (client_sock_fd < 0) { | |
2507 | goto error; | |
2508 | } | |
2509 | ||
2510 | thread_state.client_sock = client_sock_fd; | |
917a718d JG |
2511 | thread = lttng_thread_create("Client management", |
2512 | thread_manage_clients, | |
2513 | shutdown_client_thread, | |
2514 | cleanup_client_thread, | |
2515 | client_quit_pipe); | |
2516 | if (!thread) { | |
2517 | goto error; | |
2518 | } | |
0f68efb6 JG |
2519 | /* The client thread now owns the client sock fd and the quit pipe. */ |
2520 | client_sock_fd = -1; | |
2521 | client_quit_pipe = NULL; | |
917a718d JG |
2522 | |
2523 | /* | |
2524 | * This thread is part of the threads that need to be fully | |
2525 | * initialized before the session daemon is marked as "ready". | |
2526 | */ | |
6cb45e93 JG |
2527 | thread_running = wait_thread_status(); |
2528 | if (!thread_running) { | |
0f68efb6 | 2529 | goto error; |
6cb45e93 | 2530 | } |
917a718d JG |
2531 | return thread; |
2532 | error: | |
0f68efb6 JG |
2533 | if (client_sock_fd >= 0) { |
2534 | if (close(client_sock_fd)) { | |
2535 | PERROR("Failed to close client socket"); | |
2536 | } | |
2537 | } | |
2538 | lttng_thread_put(thread); | |
917a718d JG |
2539 | cleanup_client_thread(client_quit_pipe); |
2540 | return NULL; | |
2541 | } |