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 | ||
159b042f | 10 | #include "common/buffer-view.h" |
3a91de3a | 11 | #include "common/compat/socket.h" |
159b042f | 12 | #include "common/dynamic-buffer.h" |
3a91de3a | 13 | #include "common/dynamic-array.h" |
9e620ea7 JG |
14 | #include "common/payload.h" |
15 | #include "common/payload-view.h" | |
fe489250 | 16 | #include "common/fd-handle.h" |
159b042f | 17 | #include "common/sessiond-comm/sessiond-comm.h" |
e368fb43 JG |
18 | #include "common/payload.h" |
19 | #include "common/payload-view.h" | |
159b042f JG |
20 | #include "lttng/lttng-error.h" |
21 | #include "lttng/tracker.h" | |
917a718d | 22 | #include <common/compat/getenv.h> |
159b042f | 23 | #include <common/tracker.h> |
917a718d JG |
24 | #include <common/unix.h> |
25 | #include <common/utils.h> | |
917a718d | 26 | #include <lttng/event-internal.h> |
b178f53e | 27 | #include <lttng/session-descriptor-internal.h> |
159b042f JG |
28 | #include <lttng/session-internal.h> |
29 | #include <lttng/userspace-probe-internal.h> | |
30 | #include <pthread.h> | |
31 | #include <signal.h> | |
32 | #include <stddef.h> | |
33 | #include <sys/stat.h> | |
1434fd36 | 34 | #include <unistd.h> |
917a718d JG |
35 | |
36 | #include "client.h" | |
37 | #include "lttng-sessiond.h" | |
38 | #include "cmd.h" | |
39 | #include "kernel.h" | |
40 | #include "save.h" | |
41 | #include "health-sessiond.h" | |
42 | #include "testpoint.h" | |
43 | #include "utils.h" | |
4ec029ed | 44 | #include "manage-consumer.h" |
022349df | 45 | #include "clear.h" |
917a718d JG |
46 | |
47 | static bool is_root; | |
48 | ||
49 | static struct thread_state { | |
6cb45e93 JG |
50 | sem_t ready; |
51 | bool running; | |
0f68efb6 | 52 | int client_sock; |
6cb45e93 JG |
53 | } thread_state; |
54 | ||
55 | static void set_thread_status(bool running) | |
917a718d | 56 | { |
6cb45e93 JG |
57 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
58 | thread_state.running = running; | |
59 | sem_post(&thread_state.ready); | |
917a718d JG |
60 | } |
61 | ||
6cb45e93 | 62 | static bool wait_thread_status(void) |
917a718d | 63 | { |
6cb45e93 JG |
64 | DBG("Waiting for client thread to be ready"); |
65 | sem_wait(&thread_state.ready); | |
66 | if (thread_state.running) { | |
67 | DBG("Client thread is ready"); | |
68 | } else { | |
69 | ERR("Initialization of client thread failed"); | |
917a718d | 70 | } |
6cb45e93 JG |
71 | |
72 | return thread_state.running; | |
917a718d JG |
73 | } |
74 | ||
75 | /* | |
76 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
77 | * right amount of memory and copying the original information from the lsm | |
78 | * structure. | |
79 | * | |
80 | * Return 0 on success, negative value on error. | |
81 | */ | |
82 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
83 | const void *payload_buf, size_t payload_len, | |
84 | const void *cmd_header_buf, size_t cmd_header_len) | |
85 | { | |
86 | int ret = 0; | |
87 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
917a718d | 88 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; |
3a91de3a JG |
89 | const struct lttcomm_lttng_msg llm = { |
90 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
91 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
92 | .cmd_header_size = cmd_header_len, | |
93 | .data_size = payload_len, | |
94 | }; | |
917a718d | 95 | |
2eb1b01f JR |
96 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
97 | if (ret) { | |
98 | goto end; | |
99 | } | |
100 | ||
fe489250 | 101 | lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles); |
917a718d | 102 | |
3a91de3a JG |
103 | cmd_ctx->lttng_msg_size = total_msg_size; |
104 | ||
105 | /* Append reply header. */ | |
106 | ret = lttng_dynamic_buffer_append( | |
107 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
108 | if (ret) { | |
917a718d JG |
109 | goto end; |
110 | } | |
111 | ||
3a91de3a | 112 | /* Append command header. */ |
917a718d | 113 | if (cmd_header_len) { |
3a91de3a JG |
114 | ret = lttng_dynamic_buffer_append( |
115 | &cmd_ctx->reply_payload.buffer, cmd_header_buf, | |
116 | cmd_header_len); | |
117 | if (ret) { | |
118 | goto end; | |
119 | } | |
917a718d JG |
120 | } |
121 | ||
3a91de3a | 122 | /* Append payload. */ |
917a718d | 123 | if (payload_len) { |
3a91de3a JG |
124 | ret = lttng_dynamic_buffer_append( |
125 | &cmd_ctx->reply_payload.buffer, payload_buf, | |
126 | payload_len); | |
127 | if (ret) { | |
128 | goto end; | |
129 | } | |
917a718d JG |
130 | } |
131 | ||
132 | end: | |
133 | return ret; | |
134 | } | |
135 | ||
e368fb43 JG |
136 | static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx) |
137 | { | |
138 | int ret; | |
139 | const struct lttcomm_lttng_msg llm = {}; | |
140 | ||
64defc29 JR |
141 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
142 | if (ret) { | |
143 | goto end; | |
144 | } | |
e368fb43 JG |
145 | |
146 | /* Append place-holder reply header. */ | |
147 | ret = lttng_dynamic_buffer_append( | |
148 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
149 | if (ret) { | |
150 | goto end; | |
151 | } | |
152 | ||
153 | cmd_ctx->lttng_msg_size = sizeof(llm); | |
154 | end: | |
155 | return ret; | |
156 | } | |
157 | ||
158 | static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len, | |
159 | size_t payload_len) | |
160 | { | |
161 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
162 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
163 | const struct lttcomm_lttng_msg llm = { | |
164 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
165 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
166 | .cmd_header_size = cmd_header_len, | |
167 | .data_size = payload_len, | |
168 | }; | |
169 | struct lttcomm_lttng_msg *p_llm; | |
170 | ||
171 | assert(cmd_ctx->reply_payload.buffer.size >= sizeof(llm)); | |
172 | ||
173 | p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data; | |
174 | ||
175 | /* Update existing header. */ | |
176 | memcpy(p_llm, &llm, sizeof(llm)); | |
177 | ||
178 | cmd_ctx->lttng_msg_size = total_msg_size; | |
179 | } | |
180 | ||
917a718d JG |
181 | /* |
182 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 183 | * exec or it will fail. |
917a718d JG |
184 | */ |
185 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
186 | { | |
4ec029ed | 187 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
188 | } |
189 | ||
190 | /* | |
191 | * Fork and exec a consumer daemon (consumerd). | |
192 | * | |
193 | * Return pid if successful else -1. | |
194 | */ | |
195 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
196 | { | |
197 | int ret; | |
198 | pid_t pid; | |
199 | const char *consumer_to_use; | |
200 | const char *verbosity; | |
201 | struct stat st; | |
202 | ||
203 | DBG("Spawning consumerd"); | |
204 | ||
205 | pid = fork(); | |
206 | if (pid == 0) { | |
207 | /* | |
208 | * Exec consumerd. | |
209 | */ | |
210 | if (config.verbose_consumer) { | |
211 | verbosity = "--verbose"; | |
212 | } else if (lttng_opt_quiet) { | |
213 | verbosity = "--quiet"; | |
214 | } else { | |
215 | verbosity = ""; | |
216 | } | |
217 | ||
218 | switch (consumer_data->type) { | |
219 | case LTTNG_CONSUMER_KERNEL: | |
220 | /* | |
221 | * Find out which consumerd to execute. We will first try the | |
222 | * 64-bit path, then the sessiond's installation directory, and | |
223 | * fallback on the 32-bit one, | |
224 | */ | |
225 | DBG3("Looking for a kernel consumer at these locations:"); | |
226 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); | |
227 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); | |
228 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); | |
229 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { | |
230 | DBG3("Found location #1"); | |
231 | consumer_to_use = config.consumerd64_bin_path.value; | |
232 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
233 | DBG3("Found location #2"); | |
234 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
235 | } else if (config.consumerd32_bin_path.value && | |
236 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
237 | DBG3("Found location #3"); | |
238 | consumer_to_use = config.consumerd32_bin_path.value; | |
239 | } else { | |
240 | DBG("Could not find any valid consumerd executable"); | |
241 | ret = -EINVAL; | |
242 | goto error; | |
243 | } | |
244 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
245 | (void) execl(consumer_to_use, | |
246 | "lttng-consumerd", verbosity, "-k", | |
247 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
248 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
249 | "--group", config.tracing_group_name.value, | |
250 | NULL); | |
251 | break; | |
252 | case LTTNG_CONSUMER64_UST: | |
253 | { | |
254 | if (config.consumerd64_lib_dir.value) { | |
b53d4e59 | 255 | const char *tmp; |
917a718d JG |
256 | size_t tmplen; |
257 | char *tmpnew; | |
258 | ||
259 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
260 | if (!tmp) { | |
261 | tmp = ""; | |
262 | } | |
263 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
264 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
265 | if (!tmpnew) { | |
266 | ret = -ENOMEM; | |
267 | goto error; | |
268 | } | |
269 | strcat(tmpnew, config.consumerd64_lib_dir.value); | |
270 | if (tmp[0] != '\0') { | |
271 | strcat(tmpnew, ":"); | |
272 | strcat(tmpnew, tmp); | |
273 | } | |
274 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
275 | free(tmpnew); | |
276 | if (ret) { | |
277 | ret = -errno; | |
278 | goto error; | |
279 | } | |
280 | } | |
281 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); | |
282 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
283 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
284 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
285 | "--group", config.tracing_group_name.value, | |
286 | NULL); | |
287 | break; | |
288 | } | |
289 | case LTTNG_CONSUMER32_UST: | |
290 | { | |
291 | if (config.consumerd32_lib_dir.value) { | |
b53d4e59 | 292 | const char *tmp; |
917a718d JG |
293 | size_t tmplen; |
294 | char *tmpnew; | |
295 | ||
296 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
297 | if (!tmp) { | |
298 | tmp = ""; | |
299 | } | |
300 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
301 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
302 | if (!tmpnew) { | |
303 | ret = -ENOMEM; | |
304 | goto error; | |
305 | } | |
306 | strcat(tmpnew, config.consumerd32_lib_dir.value); | |
307 | if (tmp[0] != '\0') { | |
308 | strcat(tmpnew, ":"); | |
309 | strcat(tmpnew, tmp); | |
310 | } | |
311 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
312 | free(tmpnew); | |
313 | if (ret) { | |
314 | ret = -errno; | |
315 | goto error; | |
316 | } | |
317 | } | |
318 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); | |
319 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
320 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
321 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
322 | "--group", config.tracing_group_name.value, | |
323 | NULL); | |
324 | break; | |
325 | } | |
326 | default: | |
327 | ERR("unknown consumer type"); | |
328 | errno = 0; | |
329 | } | |
330 | if (errno != 0) { | |
331 | PERROR("Consumer execl()"); | |
332 | } | |
333 | /* Reaching this point, we got a failure on our execl(). */ | |
334 | exit(EXIT_FAILURE); | |
335 | } else if (pid > 0) { | |
336 | ret = pid; | |
337 | } else { | |
338 | PERROR("start consumer fork"); | |
339 | ret = -errno; | |
340 | } | |
341 | error: | |
342 | return ret; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Spawn the consumerd daemon and session daemon thread. | |
347 | */ | |
348 | static int start_consumerd(struct consumer_data *consumer_data) | |
349 | { | |
350 | int ret; | |
351 | ||
352 | /* | |
353 | * Set the listen() state on the socket since there is a possible race | |
354 | * between the exec() of the consumer daemon and this call if place in the | |
355 | * consumer thread. See bug #366 for more details. | |
356 | */ | |
357 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
358 | if (ret < 0) { | |
359 | goto error; | |
360 | } | |
361 | ||
362 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
363 | if (consumer_data->pid != 0) { | |
364 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
365 | goto end; | |
366 | } | |
367 | ||
368 | ret = spawn_consumerd(consumer_data); | |
369 | if (ret < 0) { | |
370 | ERR("Spawning consumerd failed"); | |
371 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
372 | goto error; | |
373 | } | |
374 | ||
375 | /* Setting up the consumer_data pid */ | |
376 | consumer_data->pid = ret; | |
377 | DBG2("Consumer pid %d", consumer_data->pid); | |
378 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
379 | ||
380 | DBG2("Spawning consumer control thread"); | |
381 | ret = spawn_consumer_thread(consumer_data); | |
382 | if (ret < 0) { | |
383 | ERR("Fatal error spawning consumer control thread"); | |
384 | goto error; | |
385 | } | |
386 | ||
387 | end: | |
388 | return 0; | |
389 | ||
390 | error: | |
391 | /* Cleanup already created sockets on error. */ | |
392 | if (consumer_data->err_sock >= 0) { | |
393 | int err; | |
394 | ||
395 | err = close(consumer_data->err_sock); | |
396 | if (err < 0) { | |
397 | PERROR("close consumer data error socket"); | |
398 | } | |
399 | } | |
400 | return ret; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Copy consumer output from the tracing session to the domain session. The | |
405 | * function also applies the right modification on a per domain basis for the | |
406 | * trace files destination directory. | |
407 | * | |
408 | * Should *NOT* be called with RCU read-side lock held. | |
409 | */ | |
410 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
411 | { | |
412 | int ret; | |
413 | const char *dir_name; | |
414 | struct consumer_output *consumer; | |
415 | ||
416 | assert(session); | |
417 | assert(session->consumer); | |
418 | ||
419 | switch (domain) { | |
420 | case LTTNG_DOMAIN_KERNEL: | |
421 | DBG3("Copying tracing session consumer output in kernel session"); | |
422 | /* | |
423 | * XXX: We should audit the session creation and what this function | |
424 | * does "extra" in order to avoid a destroy since this function is used | |
425 | * in the domain session creation (kernel and ust) only. Same for UST | |
426 | * domain. | |
427 | */ | |
428 | if (session->kernel_session->consumer) { | |
429 | consumer_output_put(session->kernel_session->consumer); | |
430 | } | |
431 | session->kernel_session->consumer = | |
432 | consumer_copy_output(session->consumer); | |
433 | /* Ease our life a bit for the next part */ | |
434 | consumer = session->kernel_session->consumer; | |
435 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
436 | break; | |
437 | case LTTNG_DOMAIN_JUL: | |
438 | case LTTNG_DOMAIN_LOG4J: | |
439 | case LTTNG_DOMAIN_PYTHON: | |
440 | case LTTNG_DOMAIN_UST: | |
441 | DBG3("Copying tracing session consumer output in UST session"); | |
442 | if (session->ust_session->consumer) { | |
443 | consumer_output_put(session->ust_session->consumer); | |
444 | } | |
445 | session->ust_session->consumer = | |
446 | consumer_copy_output(session->consumer); | |
447 | /* Ease our life a bit for the next part */ | |
448 | consumer = session->ust_session->consumer; | |
449 | dir_name = DEFAULT_UST_TRACE_DIR; | |
450 | break; | |
451 | default: | |
452 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
453 | goto error; | |
454 | } | |
455 | ||
456 | /* Append correct directory to subdir */ | |
b178f53e JG |
457 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
458 | sizeof(consumer->domain_subdir)); | |
459 | if (ret) { | |
460 | ret = LTTNG_ERR_UNK; | |
461 | goto error; | |
462 | } | |
463 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
464 | ret = LTTNG_OK; |
465 | ||
466 | error: | |
467 | return ret; | |
468 | } | |
469 | ||
470 | /* | |
471 | * Create an UST session and add it to the session ust list. | |
472 | * | |
473 | * Should *NOT* be called with RCU read-side lock held. | |
474 | */ | |
475 | static int create_ust_session(struct ltt_session *session, | |
df4f5a87 | 476 | const struct lttng_domain *domain) |
917a718d JG |
477 | { |
478 | int ret; | |
479 | struct ltt_ust_session *lus = NULL; | |
480 | ||
481 | assert(session); | |
482 | assert(domain); | |
483 | assert(session->consumer); | |
484 | ||
485 | switch (domain->type) { | |
486 | case LTTNG_DOMAIN_JUL: | |
487 | case LTTNG_DOMAIN_LOG4J: | |
488 | case LTTNG_DOMAIN_PYTHON: | |
489 | case LTTNG_DOMAIN_UST: | |
490 | break; | |
491 | default: | |
492 | ERR("Unknown UST domain on create session %d", domain->type); | |
493 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
494 | goto error; | |
495 | } | |
496 | ||
497 | DBG("Creating UST session"); | |
498 | ||
499 | lus = trace_ust_create_session(session->id); | |
500 | if (lus == NULL) { | |
501 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
502 | goto error; | |
503 | } | |
504 | ||
505 | lus->uid = session->uid; | |
506 | lus->gid = session->gid; | |
507 | lus->output_traces = session->output_traces; | |
508 | lus->snapshot_mode = session->snapshot_mode; | |
509 | lus->live_timer_interval = session->live_timer; | |
510 | session->ust_session = lus; | |
511 | if (session->shm_path[0]) { | |
512 | strncpy(lus->root_shm_path, session->shm_path, | |
513 | sizeof(lus->root_shm_path)); | |
514 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
515 | strncpy(lus->shm_path, session->shm_path, | |
516 | sizeof(lus->shm_path)); | |
517 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
518 | strncat(lus->shm_path, "/ust", | |
519 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
520 | } | |
521 | /* Copy session output to the newly created UST session */ | |
522 | ret = copy_session_consumer(domain->type, session); | |
523 | if (ret != LTTNG_OK) { | |
524 | goto error; | |
525 | } | |
526 | ||
527 | return LTTNG_OK; | |
528 | ||
529 | error: | |
530 | free(lus); | |
531 | session->ust_session = NULL; | |
532 | return ret; | |
533 | } | |
534 | ||
535 | /* | |
536 | * Create a kernel tracer session then create the default channel. | |
537 | */ | |
538 | static int create_kernel_session(struct ltt_session *session) | |
539 | { | |
540 | int ret; | |
541 | ||
542 | DBG("Creating kernel session"); | |
543 | ||
7d268848 | 544 | ret = kernel_create_session(session); |
917a718d JG |
545 | if (ret < 0) { |
546 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 547 | goto error_create; |
917a718d JG |
548 | } |
549 | ||
550 | /* Code flow safety */ | |
551 | assert(session->kernel_session); | |
552 | ||
553 | /* Copy session output to the newly created Kernel session */ | |
554 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
555 | if (ret != LTTNG_OK) { | |
556 | goto error; | |
557 | } | |
558 | ||
559 | session->kernel_session->uid = session->uid; | |
560 | session->kernel_session->gid = session->gid; | |
561 | session->kernel_session->output_traces = session->output_traces; | |
562 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
a2814ea7 | 563 | session->kernel_session->is_live_session = session->live_timer != 0; |
917a718d JG |
564 | |
565 | return LTTNG_OK; | |
566 | ||
567 | error: | |
568 | trace_kernel_destroy_session(session->kernel_session); | |
569 | session->kernel_session = NULL; | |
5d0a7bcb | 570 | error_create: |
917a718d JG |
571 | return ret; |
572 | } | |
573 | ||
574 | /* | |
575 | * Count number of session permitted by uid/gid. | |
576 | */ | |
577 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
578 | { | |
579 | unsigned int i = 0; | |
580 | struct ltt_session *session; | |
581 | const struct ltt_session_list *session_list = session_get_list(); | |
582 | ||
d7b377ed | 583 | DBG("Counting number of available session for UID %d", uid); |
917a718d JG |
584 | cds_list_for_each_entry(session, &session_list->head, list) { |
585 | if (!session_get(session)) { | |
586 | continue; | |
587 | } | |
588 | session_lock(session); | |
589 | /* Only count the sessions the user can control. */ | |
d7b377ed | 590 | if (session_access_ok(session, uid) && |
917a718d JG |
591 | !session->destroyed) { |
592 | i++; | |
593 | } | |
594 | session_unlock(session); | |
595 | session_put(session); | |
596 | } | |
597 | return i; | |
598 | } | |
599 | ||
600 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
601 | int *sock_error, struct lttng_event *event) | |
602 | { | |
fe489250 | 603 | int fd = -1, ret; |
917a718d | 604 | struct lttng_userspace_probe_location *probe_location; |
e368fb43 | 605 | struct lttng_payload probe_location_payload; |
fe489250 | 606 | struct fd_handle *handle = NULL; |
917a718d JG |
607 | |
608 | /* | |
e368fb43 | 609 | * Create a payload to store the serialized version of the probe |
917a718d JG |
610 | * location. |
611 | */ | |
e368fb43 JG |
612 | lttng_payload_init(&probe_location_payload); |
613 | ||
614 | ret = lttng_dynamic_buffer_set_size(&probe_location_payload.buffer, | |
3a91de3a | 615 | cmd_ctx->lsm.u.enable.userspace_probe_location_len); |
917a718d JG |
616 | if (ret) { |
617 | ret = LTTNG_ERR_NOMEM; | |
618 | goto error; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Receive the probe location. | |
623 | */ | |
e368fb43 JG |
624 | ret = lttcomm_recv_unix_sock(sock, probe_location_payload.buffer.data, |
625 | probe_location_payload.buffer.size); | |
917a718d JG |
626 | if (ret <= 0) { |
627 | DBG("Nothing recv() from client var len data... continuing"); | |
628 | *sock_error = 1; | |
917a718d JG |
629 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
630 | goto error; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Receive the file descriptor to the target binary from the client. | |
635 | */ | |
636 | DBG("Receiving userspace probe target FD from client ..."); | |
637 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
638 | if (ret <= 0) { | |
639 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
640 | *sock_error = 1; | |
641 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
642 | goto error; | |
643 | } | |
644 | ||
fe489250 JG |
645 | handle = fd_handle_create(fd); |
646 | if (!handle) { | |
647 | ret = LTTNG_ERR_NOMEM; | |
648 | goto error; | |
649 | } | |
650 | ||
651 | /* Transferred to the handle. */ | |
652 | fd = -1; | |
653 | ||
654 | ret = lttng_payload_push_fd_handle(&probe_location_payload, handle); | |
e368fb43 JG |
655 | if (ret) { |
656 | ERR("Failed to add userspace probe file descriptor to payload"); | |
657 | ret = LTTNG_ERR_NOMEM; | |
917a718d JG |
658 | goto error; |
659 | } | |
660 | ||
fe489250 JG |
661 | fd_handle_put(handle); |
662 | handle = NULL; | |
663 | ||
e368fb43 JG |
664 | { |
665 | struct lttng_payload_view view = lttng_payload_view_from_payload( | |
666 | &probe_location_payload, 0, -1); | |
917a718d | 667 | |
e368fb43 JG |
668 | /* Extract the probe location from the serialized version. */ |
669 | ret = lttng_userspace_probe_location_create_from_payload( | |
670 | &view, &probe_location); | |
671 | } | |
672 | if (ret < 0) { | |
673 | WARN("Failed to create a userspace probe location from the received buffer"); | |
917a718d JG |
674 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
675 | goto error; | |
676 | } | |
677 | ||
678 | /* Attach the probe location to the event. */ | |
679 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
680 | if (ret) { | |
681 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
682 | goto error; | |
683 | } | |
684 | ||
917a718d | 685 | error: |
fe489250 JG |
686 | if (fd >= 0) { |
687 | if (close(fd)) { | |
688 | PERROR("Failed to close userspace probe location binary fd"); | |
689 | } | |
690 | } | |
691 | ||
692 | fd_handle_put(handle); | |
e368fb43 | 693 | lttng_payload_reset(&probe_location_payload); |
917a718d JG |
694 | return ret; |
695 | } | |
696 | ||
917a718d JG |
697 | /* |
698 | * Version of setup_lttng_msg() without command header. | |
699 | */ | |
700 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
701 | void *payload_buf, size_t payload_len) | |
702 | { | |
703 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
704 | } | |
705 | ||
917a718d JG |
706 | /* |
707 | * Check if the current kernel tracer supports the session rotation feature. | |
708 | * Return 1 if it does, 0 otherwise. | |
709 | */ | |
710 | static int check_rotate_compatible(void) | |
711 | { | |
712 | int ret = 1; | |
713 | ||
714 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
715 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
716 | ret = 0; | |
717 | } | |
718 | ||
719 | return ret; | |
720 | } | |
721 | ||
722 | /* | |
723 | * Send data on a unix socket using the liblttsessiondcomm API. | |
724 | * | |
725 | * Return lttcomm error code. | |
726 | */ | |
3a91de3a | 727 | static int send_unix_sock(int sock, struct lttng_payload_view *view) |
917a718d | 728 | { |
3a91de3a | 729 | int ret; |
fe489250 | 730 | const int fd_count = lttng_payload_view_get_fd_handle_count(view); |
3a91de3a | 731 | |
917a718d | 732 | /* Check valid length */ |
3a91de3a JG |
733 | if (view->buffer.size == 0) { |
734 | ret = -1; | |
735 | goto end; | |
736 | } | |
737 | ||
738 | ret = lttcomm_send_unix_sock( | |
739 | sock, view->buffer.data, view->buffer.size); | |
740 | if (ret < 0) { | |
741 | goto end; | |
917a718d JG |
742 | } |
743 | ||
fe489250 | 744 | if (fd_count > 0) { |
700741dc JG |
745 | ret = lttcomm_send_payload_view_fds_unix_sock(sock, view); |
746 | if (ret < 0) { | |
747 | goto end; | |
fe489250 | 748 | } |
3a91de3a JG |
749 | } |
750 | ||
751 | end: | |
752 | return ret; | |
917a718d JG |
753 | } |
754 | ||
755 | /* | |
756 | * Process the command requested by the lttng client within the command | |
757 | * context structure. This function make sure that the return structure (llm) | |
758 | * is set and ready for transmission before returning. | |
759 | * | |
760 | * Return any error encountered or 0 for success. | |
761 | * | |
762 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
763 | * A command may assume the ownership of the socket, in which case its value |
764 | * should be set to -1. | |
917a718d JG |
765 | * |
766 | * Should *NOT* be called with RCU read-side lock held. | |
767 | */ | |
3e3665b8 | 768 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
917a718d JG |
769 | int *sock_error) |
770 | { | |
771 | int ret = LTTNG_OK; | |
772 | int need_tracing_session = 1; | |
773 | int need_domain; | |
774 | ||
3a91de3a | 775 | DBG("Processing client command %d", cmd_ctx->lsm.cmd_type); |
917a718d JG |
776 | |
777 | assert(!rcu_read_ongoing()); | |
778 | ||
779 | *sock_error = 0; | |
780 | ||
3a91de3a | 781 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 782 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
783 | case LTTNG_DESTROY_SESSION: |
784 | case LTTNG_LIST_SESSIONS: | |
785 | case LTTNG_LIST_DOMAINS: | |
786 | case LTTNG_START_TRACE: | |
787 | case LTTNG_STOP_TRACE: | |
788 | case LTTNG_DATA_PENDING: | |
789 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
790 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
791 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
792 | case LTTNG_SNAPSHOT_RECORD: | |
793 | case LTTNG_SAVE_SESSION: | |
794 | case LTTNG_SET_SESSION_SHM_PATH: | |
795 | case LTTNG_REGENERATE_METADATA: | |
796 | case LTTNG_REGENERATE_STATEDUMP: | |
797 | case LTTNG_REGISTER_TRIGGER: | |
798 | case LTTNG_UNREGISTER_TRIGGER: | |
799 | case LTTNG_ROTATE_SESSION: | |
800 | case LTTNG_ROTATION_GET_INFO: | |
801 | case LTTNG_ROTATION_SET_SCHEDULE: | |
802 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
022349df | 803 | case LTTNG_CLEAR_SESSION: |
917a718d JG |
804 | need_domain = 0; |
805 | break; | |
806 | default: | |
807 | need_domain = 1; | |
808 | } | |
809 | ||
810 | if (config.no_kernel && need_domain | |
3a91de3a | 811 | && cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) { |
917a718d JG |
812 | if (!is_root) { |
813 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
814 | } else { | |
815 | ret = LTTNG_ERR_KERN_NA; | |
816 | } | |
817 | goto error; | |
818 | } | |
819 | ||
820 | /* Deny register consumer if we already have a spawned consumer. */ | |
3a91de3a | 821 | if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
822 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
823 | if (kconsumer_data.pid > 0) { | |
824 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
825 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
826 | goto error; | |
827 | } | |
828 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
829 | } | |
830 | ||
831 | /* | |
832 | * Check for command that don't needs to allocate a returned payload. We do | |
833 | * this here so we don't have to make the call for no payload at each | |
834 | * command. | |
835 | */ | |
3a91de3a | 836 | switch(cmd_ctx->lsm.cmd_type) { |
917a718d JG |
837 | case LTTNG_LIST_SESSIONS: |
838 | case LTTNG_LIST_TRACEPOINTS: | |
839 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
840 | case LTTNG_LIST_DOMAINS: | |
841 | case LTTNG_LIST_CHANNELS: | |
842 | case LTTNG_LIST_EVENTS: | |
843 | case LTTNG_LIST_SYSCALLS: | |
159b042f JG |
844 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
845 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
846 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
917a718d JG |
847 | case LTTNG_DATA_PENDING: |
848 | case LTTNG_ROTATE_SESSION: | |
849 | case LTTNG_ROTATION_GET_INFO: | |
917a718d JG |
850 | break; |
851 | default: | |
852 | /* Setup lttng message with no payload */ | |
853 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
854 | if (ret < 0) { | |
855 | /* This label does not try to unlock the session */ | |
856 | goto init_setup_error; | |
857 | } | |
858 | } | |
859 | ||
860 | /* Commands that DO NOT need a session. */ | |
3a91de3a | 861 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 862 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
863 | case LTTNG_LIST_SESSIONS: |
864 | case LTTNG_LIST_TRACEPOINTS: | |
865 | case LTTNG_LIST_SYSCALLS: | |
866 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
867 | case LTTNG_SAVE_SESSION: | |
868 | case LTTNG_REGISTER_TRIGGER: | |
869 | case LTTNG_UNREGISTER_TRIGGER: | |
870 | need_tracing_session = 0; | |
871 | break; | |
872 | default: | |
3a91de3a | 873 | DBG("Getting session %s by name", cmd_ctx->lsm.session.name); |
917a718d JG |
874 | /* |
875 | * We keep the session list lock across _all_ commands | |
876 | * for now, because the per-session lock does not | |
877 | * handle teardown properly. | |
878 | */ | |
879 | session_lock_list(); | |
3a91de3a | 880 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name); |
917a718d JG |
881 | if (cmd_ctx->session == NULL) { |
882 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
883 | goto error; | |
884 | } else { | |
885 | /* Acquire lock for the session */ | |
886 | session_lock(cmd_ctx->session); | |
887 | } | |
888 | break; | |
889 | } | |
890 | ||
891 | /* | |
892 | * Commands that need a valid session but should NOT create one if none | |
893 | * exists. Instead of creating one and destroying it when the command is | |
894 | * handled, process that right before so we save some round trip in useless | |
895 | * code path. | |
896 | */ | |
3a91de3a | 897 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
898 | case LTTNG_DISABLE_CHANNEL: |
899 | case LTTNG_DISABLE_EVENT: | |
3a91de3a | 900 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
901 | case LTTNG_DOMAIN_KERNEL: |
902 | if (!cmd_ctx->session->kernel_session) { | |
903 | ret = LTTNG_ERR_NO_CHANNEL; | |
904 | goto error; | |
905 | } | |
906 | break; | |
907 | case LTTNG_DOMAIN_JUL: | |
908 | case LTTNG_DOMAIN_LOG4J: | |
909 | case LTTNG_DOMAIN_PYTHON: | |
910 | case LTTNG_DOMAIN_UST: | |
911 | if (!cmd_ctx->session->ust_session) { | |
912 | ret = LTTNG_ERR_NO_CHANNEL; | |
913 | goto error; | |
914 | } | |
915 | break; | |
916 | default: | |
917 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
918 | goto error; | |
919 | } | |
920 | default: | |
921 | break; | |
922 | } | |
923 | ||
924 | if (!need_domain) { | |
925 | goto skip_domain; | |
926 | } | |
927 | ||
928 | /* | |
929 | * Check domain type for specific "pre-action". | |
930 | */ | |
3a91de3a | 931 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
932 | case LTTNG_DOMAIN_KERNEL: |
933 | if (!is_root) { | |
934 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
935 | goto error; | |
936 | } | |
937 | ||
7d268848 MD |
938 | /* Kernel tracer check */ |
939 | if (!kernel_tracer_is_initialized()) { | |
940 | /* Basically, load kernel tracer modules */ | |
941 | ret = init_kernel_tracer(); | |
942 | if (ret != 0) { | |
943 | goto error; | |
944 | } | |
945 | } | |
946 | ||
917a718d JG |
947 | /* Consumer is in an ERROR state. Report back to client */ |
948 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
949 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
950 | goto error; | |
951 | } | |
952 | ||
953 | /* Need a session for kernel command */ | |
954 | if (need_tracing_session) { | |
955 | if (cmd_ctx->session->kernel_session == NULL) { | |
956 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 957 | if (ret != LTTNG_OK) { |
917a718d JG |
958 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
959 | goto error; | |
960 | } | |
961 | } | |
962 | ||
963 | /* Start the kernel consumer daemon */ | |
964 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
965 | if (kconsumer_data.pid == 0 && | |
3a91de3a | 966 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
967 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
968 | ret = start_consumerd(&kconsumer_data); | |
969 | if (ret < 0) { | |
970 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
971 | goto error; | |
972 | } | |
973 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); | |
974 | } else { | |
975 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
976 | } | |
977 | ||
978 | /* | |
979 | * The consumer was just spawned so we need to add the socket to | |
980 | * the consumer output of the session if exist. | |
981 | */ | |
982 | ret = consumer_create_socket(&kconsumer_data, | |
983 | cmd_ctx->session->kernel_session->consumer); | |
984 | if (ret < 0) { | |
985 | goto error; | |
986 | } | |
987 | } | |
988 | ||
989 | break; | |
990 | case LTTNG_DOMAIN_JUL: | |
991 | case LTTNG_DOMAIN_LOG4J: | |
992 | case LTTNG_DOMAIN_PYTHON: | |
993 | case LTTNG_DOMAIN_UST: | |
994 | { | |
995 | if (!ust_app_supported()) { | |
996 | ret = LTTNG_ERR_NO_UST; | |
997 | goto error; | |
998 | } | |
999 | /* Consumer is in an ERROR state. Report back to client */ | |
1000 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
1001 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1002 | goto error; | |
1003 | } | |
1004 | ||
1005 | if (need_tracing_session) { | |
1006 | /* Create UST session if none exist. */ | |
1007 | if (cmd_ctx->session->ust_session == NULL) { | |
1008 | ret = create_ust_session(cmd_ctx->session, | |
3a91de3a | 1009 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain)); |
917a718d JG |
1010 | if (ret != LTTNG_OK) { |
1011 | goto error; | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | /* Start the UST consumer daemons */ | |
1016 | /* 64-bit */ | |
1017 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
1018 | if (config.consumerd64_bin_path.value && | |
1019 | ustconsumer64_data.pid == 0 && | |
3a91de3a | 1020 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1021 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
1022 | ret = start_consumerd(&ustconsumer64_data); | |
1023 | if (ret < 0) { | |
1024 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
1025 | uatomic_set(&ust_consumerd64_fd, -EINVAL); | |
1026 | goto error; | |
1027 | } | |
1028 | ||
1029 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); | |
1030 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1031 | } else { | |
1032 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * Setup socket for consumer 64 bit. No need for atomic access | |
1037 | * since it was set above and can ONLY be set in this thread. | |
1038 | */ | |
1039 | ret = consumer_create_socket(&ustconsumer64_data, | |
1040 | cmd_ctx->session->ust_session->consumer); | |
1041 | if (ret < 0) { | |
1042 | goto error; | |
1043 | } | |
1044 | ||
1045 | /* 32-bit */ | |
1046 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); | |
1047 | if (config.consumerd32_bin_path.value && | |
1048 | ustconsumer32_data.pid == 0 && | |
3a91de3a | 1049 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1050 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
1051 | ret = start_consumerd(&ustconsumer32_data); | |
1052 | if (ret < 0) { | |
1053 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
1054 | uatomic_set(&ust_consumerd32_fd, -EINVAL); | |
1055 | goto error; | |
1056 | } | |
1057 | ||
1058 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); | |
1059 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1060 | } else { | |
1061 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Setup socket for consumer 32 bit. No need for atomic access | |
1066 | * since it was set above and can ONLY be set in this thread. | |
1067 | */ | |
1068 | ret = consumer_create_socket(&ustconsumer32_data, | |
1069 | cmd_ctx->session->ust_session->consumer); | |
1070 | if (ret < 0) { | |
1071 | goto error; | |
1072 | } | |
1073 | } | |
1074 | break; | |
1075 | } | |
1076 | default: | |
1077 | break; | |
1078 | } | |
1079 | skip_domain: | |
1080 | ||
1081 | /* Validate consumer daemon state when start/stop trace command */ | |
3a91de3a JG |
1082 | if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE || |
1083 | cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) { | |
1084 | switch (cmd_ctx->lsm.domain.type) { | |
917a718d JG |
1085 | case LTTNG_DOMAIN_NONE: |
1086 | break; | |
1087 | case LTTNG_DOMAIN_JUL: | |
1088 | case LTTNG_DOMAIN_LOG4J: | |
1089 | case LTTNG_DOMAIN_PYTHON: | |
1090 | case LTTNG_DOMAIN_UST: | |
1091 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
1092 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1093 | goto error; | |
1094 | } | |
1095 | break; | |
1096 | case LTTNG_DOMAIN_KERNEL: | |
1097 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
1098 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
1099 | goto error; | |
1100 | } | |
1101 | break; | |
1102 | default: | |
1103 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1104 | goto error; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | /* | |
d7b377ed | 1109 | * Check that the UID matches that of the tracing session. |
917a718d JG |
1110 | * The root user can interact with all sessions. |
1111 | */ | |
1112 | if (need_tracing_session) { | |
1113 | if (!session_access_ok(cmd_ctx->session, | |
d7b377ed | 1114 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) || |
917a718d JG |
1115 | cmd_ctx->session->destroyed) { |
1116 | ret = LTTNG_ERR_EPERM; | |
1117 | goto error; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Send relayd information to consumer as soon as we have a domain and a | |
1123 | * session defined. | |
1124 | */ | |
1125 | if (cmd_ctx->session && need_domain) { | |
1126 | /* | |
1127 | * Setup relayd if not done yet. If the relayd information was already | |
1128 | * sent to the consumer, this call will gracefully return. | |
1129 | */ | |
1130 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1131 | if (ret != LTTNG_OK) { | |
1132 | goto error; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /* Process by command type */ | |
3a91de3a | 1137 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1138 | case LTTNG_ADD_CONTEXT: |
1139 | { | |
1140 | /* | |
1141 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1142 | * payload if the context being added is an application context. | |
1143 | */ | |
3a91de3a | 1144 | if (cmd_ctx->lsm.u.context.ctx.ctx == |
917a718d JG |
1145 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1146 | char *provider_name = NULL, *context_name = NULL; | |
1147 | size_t provider_name_len = | |
3a91de3a | 1148 | cmd_ctx->lsm.u.context.provider_name_len; |
917a718d | 1149 | size_t context_name_len = |
3a91de3a | 1150 | cmd_ctx->lsm.u.context.context_name_len; |
917a718d JG |
1151 | |
1152 | if (provider_name_len == 0 || context_name_len == 0) { | |
1153 | /* | |
1154 | * Application provider and context names MUST | |
1155 | * be provided. | |
1156 | */ | |
1157 | ret = -LTTNG_ERR_INVALID; | |
1158 | goto error; | |
1159 | } | |
1160 | ||
1161 | provider_name = zmalloc(provider_name_len + 1); | |
1162 | if (!provider_name) { | |
1163 | ret = -LTTNG_ERR_NOMEM; | |
1164 | goto error; | |
1165 | } | |
3a91de3a | 1166 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = |
917a718d JG |
1167 | provider_name; |
1168 | ||
1169 | context_name = zmalloc(context_name_len + 1); | |
1170 | if (!context_name) { | |
1171 | ret = -LTTNG_ERR_NOMEM; | |
1172 | goto error_add_context; | |
1173 | } | |
3a91de3a | 1174 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = |
917a718d JG |
1175 | context_name; |
1176 | ||
3e3665b8 | 1177 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
917a718d JG |
1178 | provider_name_len); |
1179 | if (ret < 0) { | |
1180 | goto error_add_context; | |
1181 | } | |
1182 | ||
3e3665b8 | 1183 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
917a718d JG |
1184 | context_name_len); |
1185 | if (ret < 0) { | |
1186 | goto error_add_context; | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * cmd_add_context assumes ownership of the provider and context | |
1192 | * names. | |
1193 | */ | |
1194 | ret = cmd_add_context(cmd_ctx->session, | |
3a91de3a JG |
1195 | cmd_ctx->lsm.domain.type, |
1196 | cmd_ctx->lsm.u.context.channel_name, | |
1197 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.context.ctx), | |
917a718d JG |
1198 | kernel_poll_pipe[1]); |
1199 | ||
3a91de3a JG |
1200 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = NULL; |
1201 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = NULL; | |
917a718d | 1202 | error_add_context: |
3a91de3a JG |
1203 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name); |
1204 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name); | |
917a718d JG |
1205 | if (ret < 0) { |
1206 | goto error; | |
1207 | } | |
1208 | break; | |
1209 | } | |
1210 | case LTTNG_DISABLE_CHANNEL: | |
1211 | { | |
3a91de3a JG |
1212 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1213 | cmd_ctx->lsm.u.disable.channel_name); | |
917a718d JG |
1214 | break; |
1215 | } | |
1216 | case LTTNG_DISABLE_EVENT: | |
1217 | { | |
1218 | ||
1219 | /* | |
1220 | * FIXME: handle filter; for now we just receive the filter's | |
1221 | * bytecode along with the filter expression which are sent by | |
1222 | * liblttng-ctl and discard them. | |
1223 | * | |
1224 | * This fixes an issue where the client may block while sending | |
1225 | * the filter payload and encounter an error because the session | |
1226 | * daemon closes the socket without ever handling this data. | |
1227 | */ | |
3a91de3a JG |
1228 | size_t count = cmd_ctx->lsm.u.disable.expression_len + |
1229 | cmd_ctx->lsm.u.disable.bytecode_len; | |
917a718d JG |
1230 | |
1231 | if (count) { | |
1232 | char data[LTTNG_FILTER_MAX_LEN]; | |
1233 | ||
1234 | DBG("Discarding disable event command payload of size %zu", count); | |
1235 | while (count) { | |
3e3665b8 | 1236 | ret = lttcomm_recv_unix_sock(*sock, data, |
917a718d JG |
1237 | count > sizeof(data) ? sizeof(data) : count); |
1238 | if (ret < 0) { | |
1239 | goto error; | |
1240 | } | |
1241 | ||
1242 | count -= (size_t) ret; | |
1243 | } | |
1244 | } | |
3a91de3a JG |
1245 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1246 | cmd_ctx->lsm.u.disable.channel_name, | |
1247 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.disable.event)); | |
917a718d JG |
1248 | break; |
1249 | } | |
1250 | case LTTNG_ENABLE_CHANNEL: | |
1251 | { | |
3a91de3a JG |
1252 | cmd_ctx->lsm.u.channel.chan.attr.extended.ptr = |
1253 | (struct lttng_channel_extended *) &cmd_ctx->lsm.u.channel.extended; | |
df4f5a87 | 1254 | ret = cmd_enable_channel(cmd_ctx->session, |
3a91de3a JG |
1255 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1256 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.channel.chan), | |
917a718d JG |
1257 | kernel_poll_pipe[1]); |
1258 | break; | |
1259 | } | |
159b042f JG |
1260 | case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE: |
1261 | case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE: | |
917a718d | 1262 | { |
159b042f JG |
1263 | struct lttng_dynamic_buffer payload; |
1264 | struct lttng_buffer_view payload_view; | |
1265 | const bool add_value = | |
3a91de3a | 1266 | cmd_ctx->lsm.cmd_type == |
159b042f JG |
1267 | LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE; |
1268 | const size_t name_len = | |
3a91de3a | 1269 | cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1270 | .name_len; |
1271 | const enum lttng_domain_type domain_type = | |
1272 | (enum lttng_domain_type) | |
3a91de3a | 1273 | cmd_ctx->lsm.domain.type; |
159b042f | 1274 | const enum lttng_process_attr process_attr = |
3a91de3a | 1275 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1276 | .process_attr_tracker_add_remove_include_value |
1277 | .process_attr; | |
1278 | const enum lttng_process_attr_value_type value_type = | |
1279 | (enum lttng_process_attr_value_type) cmd_ctx | |
3a91de3a | 1280 | ->lsm.u |
159b042f JG |
1281 | .process_attr_tracker_add_remove_include_value |
1282 | .value_type; | |
1283 | struct process_attr_value *value; | |
1284 | enum lttng_error_code ret_code; | |
1434fd36 MJ |
1285 | long login_name_max; |
1286 | ||
1287 | login_name_max = sysconf(_SC_LOGIN_NAME_MAX); | |
1288 | if (login_name_max < 0) { | |
1289 | PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration"); | |
1290 | ret = LTTNG_ERR_INVALID; | |
1291 | goto error; | |
1292 | } | |
159b042f JG |
1293 | |
1294 | /* Receive remaining variable length payload if applicable. */ | |
1434fd36 | 1295 | if (name_len > login_name_max) { |
159b042f JG |
1296 | /* |
1297 | * POSIX mandates user and group names that are at least | |
1298 | * 8 characters long. Note that although shadow-utils | |
1299 | * (useradd, groupaadd, etc.) use 32 chars as their | |
1300 | * limit (from bits/utmp.h, UT_NAMESIZE), | |
1301 | * LOGIN_NAME_MAX is defined to 256. | |
1302 | */ | |
1434fd36 | 1303 | ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld", |
159b042f | 1304 | add_value ? "addition" : "removal", |
1434fd36 | 1305 | name_len, login_name_max); |
159b042f | 1306 | ret = LTTNG_ERR_INVALID; |
2d97a006 JR |
1307 | goto error; |
1308 | } | |
1309 | ||
159b042f JG |
1310 | lttng_dynamic_buffer_init(&payload); |
1311 | if (name_len != 0) { | |
1312 | /* | |
1313 | * Receive variable payload for user/group name | |
1314 | * arguments. | |
1315 | */ | |
1316 | ret = lttng_dynamic_buffer_set_size(&payload, name_len); | |
1317 | if (ret) { | |
1318 | ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument", | |
1319 | add_value ? "add" : "remove"); | |
55c9e7ca | 1320 | ret = LTTNG_ERR_NOMEM; |
159b042f | 1321 | goto error_add_remove_tracker_value; |
55c9e7ca | 1322 | } |
159b042f JG |
1323 | |
1324 | ret = lttcomm_recv_unix_sock( | |
1325 | *sock, payload.data, name_len); | |
55c9e7ca | 1326 | if (ret <= 0) { |
159b042f JG |
1327 | ERR("Failed to receive payload of %s process attribute tracker value argument", |
1328 | add_value ? "add" : "remove"); | |
55c9e7ca | 1329 | *sock_error = 1; |
159b042f JG |
1330 | ret = LTTNG_ERR_INVALID_PROTOCOL; |
1331 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1332 | } |
159b042f | 1333 | } |
2d97a006 | 1334 | |
159b042f JG |
1335 | payload_view = lttng_buffer_view_from_dynamic_buffer( |
1336 | &payload, 0, name_len); | |
1337 | /* | |
1338 | * Validate the value type and domains are legal for the process | |
1339 | * attribute tracker that is specified and convert the value to | |
1340 | * add/remove to the internal sessiond representation. | |
1341 | */ | |
1342 | ret_code = process_attr_value_from_comm(domain_type, | |
1343 | process_attr, value_type, | |
3a91de3a | 1344 | &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1345 | .integral_value, |
1346 | &payload_view, &value); | |
1347 | if (ret_code != LTTNG_OK) { | |
1348 | ret = ret_code; | |
1349 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1350 | } |
159b042f JG |
1351 | |
1352 | if (add_value) { | |
1353 | ret = cmd_process_attr_tracker_inclusion_set_add_value( | |
1354 | cmd_ctx->session, domain_type, | |
1355 | process_attr, value); | |
1356 | } else { | |
1357 | ret = cmd_process_attr_tracker_inclusion_set_remove_value( | |
1358 | cmd_ctx->session, domain_type, | |
1359 | process_attr, value); | |
1360 | } | |
1361 | process_attr_value_destroy(value); | |
1362 | error_add_remove_tracker_value: | |
1363 | lttng_dynamic_buffer_reset(&payload); | |
1364 | break; | |
1365 | } | |
1366 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
1367 | { | |
1368 | enum lttng_tracking_policy tracking_policy; | |
1369 | const enum lttng_domain_type domain_type = | |
1370 | (enum lttng_domain_type) | |
3a91de3a | 1371 | cmd_ctx->lsm.domain.type; |
159b042f | 1372 | const enum lttng_process_attr process_attr = |
3a91de3a | 1373 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1374 | .process_attr_tracker_get_tracking_policy |
1375 | .process_attr; | |
1376 | ||
1377 | ret = cmd_process_attr_tracker_get_tracking_policy( | |
1378 | cmd_ctx->session, domain_type, process_attr, | |
1379 | &tracking_policy); | |
1380 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1381 | goto error; |
1382 | } | |
2d97a006 | 1383 | |
159b042f JG |
1384 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, |
1385 | &(uint32_t){tracking_policy}, sizeof(uint32_t)); | |
1386 | if (ret < 0) { | |
1387 | ret = LTTNG_ERR_NOMEM; | |
2d97a006 JR |
1388 | goto error; |
1389 | } | |
159b042f | 1390 | ret = LTTNG_OK; |
917a718d JG |
1391 | break; |
1392 | } | |
159b042f | 1393 | case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY: |
917a718d | 1394 | { |
159b042f | 1395 | const enum lttng_tracking_policy tracking_policy = |
3a91de3a | 1396 | (enum lttng_tracking_policy) cmd_ctx->lsm.u |
159b042f JG |
1397 | .process_attr_tracker_set_tracking_policy |
1398 | .tracking_policy; | |
1399 | const enum lttng_domain_type domain_type = | |
1400 | (enum lttng_domain_type) | |
3a91de3a | 1401 | cmd_ctx->lsm.domain.type; |
159b042f | 1402 | const enum lttng_process_attr process_attr = |
3a91de3a | 1403 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1404 | .process_attr_tracker_set_tracking_policy |
1405 | .process_attr; | |
1406 | ||
1407 | ret = cmd_process_attr_tracker_set_tracking_policy( | |
1408 | cmd_ctx->session, domain_type, process_attr, | |
1409 | tracking_policy); | |
1410 | if (ret != LTTNG_OK) { | |
1411 | goto error; | |
55c9e7ca | 1412 | } |
159b042f JG |
1413 | break; |
1414 | } | |
1415 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
1416 | { | |
1417 | struct lttng_process_attr_values *values; | |
1418 | struct lttng_dynamic_buffer reply; | |
1419 | const enum lttng_domain_type domain_type = | |
1420 | (enum lttng_domain_type) | |
3a91de3a | 1421 | cmd_ctx->lsm.domain.type; |
159b042f | 1422 | const enum lttng_process_attr process_attr = |
3a91de3a | 1423 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1424 | .process_attr_tracker_get_inclusion_set |
1425 | .process_attr; | |
1426 | ||
1427 | ret = cmd_process_attr_tracker_get_inclusion_set( | |
1428 | cmd_ctx->session, domain_type, process_attr, | |
1429 | &values); | |
1430 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1431 | goto error; |
1432 | } | |
2d97a006 | 1433 | |
159b042f JG |
1434 | lttng_dynamic_buffer_init(&reply); |
1435 | ret = lttng_process_attr_values_serialize(values, &reply); | |
1436 | if (ret < 0) { | |
1437 | goto error_tracker_get_inclusion_set; | |
2d97a006 JR |
1438 | } |
1439 | ||
159b042f JG |
1440 | ret = setup_lttng_msg_no_cmd_header( |
1441 | cmd_ctx, reply.data, reply.size); | |
1442 | if (ret < 0) { | |
1443 | ret = LTTNG_ERR_NOMEM; | |
1444 | goto error_tracker_get_inclusion_set; | |
1445 | } | |
1446 | ret = LTTNG_OK; | |
1447 | ||
1448 | error_tracker_get_inclusion_set: | |
1449 | lttng_process_attr_values_destroy(values); | |
1450 | lttng_dynamic_buffer_reset(&reply); | |
917a718d JG |
1451 | break; |
1452 | } | |
1453 | case LTTNG_ENABLE_EVENT: | |
1454 | { | |
1455 | struct lttng_event *ev = NULL; | |
1456 | struct lttng_event_exclusion *exclusion = NULL; | |
1457 | struct lttng_filter_bytecode *bytecode = NULL; | |
1458 | char *filter_expression = NULL; | |
1459 | ||
1460 | /* Handle exclusion events and receive it from the client. */ | |
3a91de3a JG |
1461 | if (cmd_ctx->lsm.u.enable.exclusion_count > 0) { |
1462 | size_t count = cmd_ctx->lsm.u.enable.exclusion_count; | |
917a718d JG |
1463 | |
1464 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1465 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1466 | if (!exclusion) { | |
1467 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1468 | goto error; | |
1469 | } | |
1470 | ||
1471 | DBG("Receiving var len exclusion event list from client ..."); | |
1472 | exclusion->count = count; | |
3e3665b8 | 1473 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
917a718d JG |
1474 | count * LTTNG_SYMBOL_NAME_LEN); |
1475 | if (ret <= 0) { | |
1476 | DBG("Nothing recv() from client var len data... continuing"); | |
1477 | *sock_error = 1; | |
1478 | free(exclusion); | |
1479 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1480 | goto error; | |
1481 | } | |
1482 | } | |
1483 | ||
1484 | /* Get filter expression from client. */ | |
3a91de3a | 1485 | if (cmd_ctx->lsm.u.enable.expression_len > 0) { |
917a718d | 1486 | size_t expression_len = |
3a91de3a | 1487 | cmd_ctx->lsm.u.enable.expression_len; |
917a718d JG |
1488 | |
1489 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1490 | ret = LTTNG_ERR_FILTER_INVAL; | |
1491 | free(exclusion); | |
1492 | goto error; | |
1493 | } | |
1494 | ||
1495 | filter_expression = zmalloc(expression_len); | |
1496 | if (!filter_expression) { | |
1497 | free(exclusion); | |
1498 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1499 | goto error; | |
1500 | } | |
1501 | ||
1502 | /* Receive var. len. data */ | |
1503 | DBG("Receiving var len filter's expression from client ..."); | |
3e3665b8 | 1504 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
917a718d JG |
1505 | expression_len); |
1506 | if (ret <= 0) { | |
1507 | DBG("Nothing recv() from client var len data... continuing"); | |
1508 | *sock_error = 1; | |
1509 | free(filter_expression); | |
1510 | free(exclusion); | |
1511 | ret = LTTNG_ERR_FILTER_INVAL; | |
1512 | goto error; | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | /* Handle filter and get bytecode from client. */ | |
3a91de3a JG |
1517 | if (cmd_ctx->lsm.u.enable.bytecode_len > 0) { |
1518 | size_t bytecode_len = cmd_ctx->lsm.u.enable.bytecode_len; | |
917a718d JG |
1519 | |
1520 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1521 | ret = LTTNG_ERR_FILTER_INVAL; | |
1522 | free(filter_expression); | |
1523 | free(exclusion); | |
1524 | goto error; | |
1525 | } | |
1526 | ||
1527 | bytecode = zmalloc(bytecode_len); | |
1528 | if (!bytecode) { | |
1529 | free(filter_expression); | |
1530 | free(exclusion); | |
1531 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1532 | goto error; | |
1533 | } | |
1534 | ||
1535 | /* Receive var. len. data */ | |
1536 | DBG("Receiving var len filter's bytecode from client ..."); | |
3e3665b8 | 1537 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
917a718d JG |
1538 | if (ret <= 0) { |
1539 | DBG("Nothing recv() from client var len data... continuing"); | |
1540 | *sock_error = 1; | |
1541 | free(filter_expression); | |
1542 | free(bytecode); | |
1543 | free(exclusion); | |
1544 | ret = LTTNG_ERR_FILTER_INVAL; | |
1545 | goto error; | |
1546 | } | |
1547 | ||
1548 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1549 | free(filter_expression); | |
1550 | free(bytecode); | |
1551 | free(exclusion); | |
1552 | ret = LTTNG_ERR_FILTER_INVAL; | |
1553 | goto error; | |
1554 | } | |
1555 | } | |
1556 | ||
3a91de3a | 1557 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm.u.enable.event)); |
917a718d JG |
1558 | if (!ev) { |
1559 | DBG("Failed to copy event: %s", | |
3a91de3a | 1560 | cmd_ctx->lsm.u.enable.event.name); |
917a718d JG |
1561 | free(filter_expression); |
1562 | free(bytecode); | |
1563 | free(exclusion); | |
1564 | ret = LTTNG_ERR_NOMEM; | |
1565 | goto error; | |
1566 | } | |
1567 | ||
1568 | ||
3a91de3a | 1569 | if (cmd_ctx->lsm.u.enable.userspace_probe_location_len > 0) { |
917a718d | 1570 | /* Expect a userspace probe description. */ |
3e3665b8 | 1571 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
917a718d JG |
1572 | if (ret) { |
1573 | free(filter_expression); | |
1574 | free(bytecode); | |
1575 | free(exclusion); | |
1576 | lttng_event_destroy(ev); | |
1577 | goto error; | |
1578 | } | |
1579 | } | |
1580 | ||
df4f5a87 | 1581 | ret = cmd_enable_event(cmd_ctx->session, |
3a91de3a JG |
1582 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1583 | cmd_ctx->lsm.u.enable.channel_name, | |
917a718d JG |
1584 | ev, |
1585 | filter_expression, bytecode, exclusion, | |
1586 | kernel_poll_pipe[1]); | |
1587 | lttng_event_destroy(ev); | |
1588 | break; | |
1589 | } | |
1590 | case LTTNG_LIST_TRACEPOINTS: | |
1591 | { | |
1592 | struct lttng_event *events; | |
1593 | ssize_t nb_events; | |
1594 | ||
1595 | session_lock_list(); | |
3a91de3a | 1596 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm.domain.type, &events); |
917a718d JG |
1597 | session_unlock_list(); |
1598 | if (nb_events < 0) { | |
1599 | /* Return value is a negative lttng_error_code. */ | |
1600 | ret = -nb_events; | |
1601 | goto error; | |
1602 | } | |
1603 | ||
1604 | /* | |
1605 | * Setup lttng message with payload size set to the event list size in | |
1606 | * bytes and then copy list into the llm payload. | |
1607 | */ | |
1608 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1609 | sizeof(struct lttng_event) * nb_events); | |
1610 | free(events); | |
1611 | ||
1612 | if (ret < 0) { | |
1613 | goto setup_error; | |
1614 | } | |
1615 | ||
1616 | ret = LTTNG_OK; | |
1617 | break; | |
1618 | } | |
1619 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1620 | { | |
1621 | struct lttng_event_field *fields; | |
1622 | ssize_t nb_fields; | |
1623 | ||
1624 | session_lock_list(); | |
3a91de3a | 1625 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm.domain.type, |
917a718d JG |
1626 | &fields); |
1627 | session_unlock_list(); | |
1628 | if (nb_fields < 0) { | |
1629 | /* Return value is a negative lttng_error_code. */ | |
1630 | ret = -nb_fields; | |
1631 | goto error; | |
1632 | } | |
1633 | ||
1634 | /* | |
1635 | * Setup lttng message with payload size set to the event list size in | |
1636 | * bytes and then copy list into the llm payload. | |
1637 | */ | |
1638 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1639 | sizeof(struct lttng_event_field) * nb_fields); | |
1640 | free(fields); | |
1641 | ||
1642 | if (ret < 0) { | |
1643 | goto setup_error; | |
1644 | } | |
1645 | ||
1646 | ret = LTTNG_OK; | |
1647 | break; | |
1648 | } | |
1649 | case LTTNG_LIST_SYSCALLS: | |
1650 | { | |
1651 | struct lttng_event *events; | |
1652 | ssize_t nb_events; | |
1653 | ||
1654 | nb_events = cmd_list_syscalls(&events); | |
1655 | if (nb_events < 0) { | |
1656 | /* Return value is a negative lttng_error_code. */ | |
1657 | ret = -nb_events; | |
1658 | goto error; | |
1659 | } | |
1660 | ||
1661 | /* | |
1662 | * Setup lttng message with payload size set to the event list size in | |
1663 | * bytes and then copy list into the llm payload. | |
1664 | */ | |
1665 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1666 | sizeof(struct lttng_event) * nb_events); | |
1667 | free(events); | |
1668 | ||
1669 | if (ret < 0) { | |
1670 | goto setup_error; | |
1671 | } | |
1672 | ||
1673 | ret = LTTNG_OK; | |
1674 | break; | |
1675 | } | |
917a718d JG |
1676 | case LTTNG_SET_CONSUMER_URI: |
1677 | { | |
1678 | size_t nb_uri, len; | |
1679 | struct lttng_uri *uris; | |
1680 | ||
3a91de3a | 1681 | nb_uri = cmd_ctx->lsm.u.uri.size; |
917a718d JG |
1682 | len = nb_uri * sizeof(struct lttng_uri); |
1683 | ||
1684 | if (nb_uri == 0) { | |
1685 | ret = LTTNG_ERR_INVALID; | |
1686 | goto error; | |
1687 | } | |
1688 | ||
1689 | uris = zmalloc(len); | |
1690 | if (uris == NULL) { | |
1691 | ret = LTTNG_ERR_FATAL; | |
1692 | goto error; | |
1693 | } | |
1694 | ||
1695 | /* Receive variable len data */ | |
1696 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1697 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1698 | if (ret <= 0) { |
1699 | DBG("No URIs received from client... continuing"); | |
1700 | *sock_error = 1; | |
1701 | ret = LTTNG_ERR_SESSION_FAIL; | |
1702 | free(uris); | |
1703 | goto error; | |
1704 | } | |
1705 | ||
1706 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1707 | free(uris); | |
1708 | if (ret != LTTNG_OK) { | |
1709 | goto error; | |
1710 | } | |
1711 | ||
1712 | ||
1713 | break; | |
1714 | } | |
1715 | case LTTNG_START_TRACE: | |
1716 | { | |
1717 | /* | |
1718 | * On the first start, if we have a kernel session and we have | |
1719 | * enabled time or size-based rotations, we have to make sure | |
1720 | * the kernel tracer supports it. | |
1721 | */ | |
1722 | if (!cmd_ctx->session->has_been_started && \ | |
1723 | cmd_ctx->session->kernel_session && \ | |
1724 | (cmd_ctx->session->rotate_timer_period || \ | |
1725 | cmd_ctx->session->rotate_size) && \ | |
1726 | !check_rotate_compatible()) { | |
1727 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1728 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1729 | goto error; | |
1730 | } | |
1731 | ret = cmd_start_trace(cmd_ctx->session); | |
1732 | break; | |
1733 | } | |
1734 | case LTTNG_STOP_TRACE: | |
1735 | { | |
1736 | ret = cmd_stop_trace(cmd_ctx->session); | |
1737 | break; | |
1738 | } | |
917a718d JG |
1739 | case LTTNG_DESTROY_SESSION: |
1740 | { | |
1741 | ret = cmd_destroy_session(cmd_ctx->session, | |
3e3665b8 JG |
1742 | notification_thread_handle, |
1743 | sock); | |
917a718d JG |
1744 | break; |
1745 | } | |
1746 | case LTTNG_LIST_DOMAINS: | |
1747 | { | |
1748 | ssize_t nb_dom; | |
1749 | struct lttng_domain *domains = NULL; | |
1750 | ||
1751 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1752 | if (nb_dom < 0) { | |
1753 | /* Return value is a negative lttng_error_code. */ | |
1754 | ret = -nb_dom; | |
1755 | goto error; | |
1756 | } | |
1757 | ||
1758 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1759 | nb_dom * sizeof(struct lttng_domain)); | |
1760 | free(domains); | |
1761 | ||
1762 | if (ret < 0) { | |
1763 | goto setup_error; | |
1764 | } | |
1765 | ||
1766 | ret = LTTNG_OK; | |
1767 | break; | |
1768 | } | |
1769 | case LTTNG_LIST_CHANNELS: | |
1770 | { | |
1771 | ssize_t payload_size; | |
1772 | struct lttng_channel *channels = NULL; | |
1773 | ||
3a91de3a | 1774 | payload_size = cmd_list_channels(cmd_ctx->lsm.domain.type, |
917a718d JG |
1775 | cmd_ctx->session, &channels); |
1776 | if (payload_size < 0) { | |
1777 | /* Return value is a negative lttng_error_code. */ | |
1778 | ret = -payload_size; | |
1779 | goto error; | |
1780 | } | |
1781 | ||
1782 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
1783 | payload_size); | |
1784 | free(channels); | |
1785 | ||
1786 | if (ret < 0) { | |
1787 | goto setup_error; | |
1788 | } | |
1789 | ||
1790 | ret = LTTNG_OK; | |
1791 | break; | |
1792 | } | |
1793 | case LTTNG_LIST_EVENTS: | |
1794 | { | |
e368fb43 JG |
1795 | ssize_t list_ret; |
1796 | struct lttcomm_event_command_header cmd_header = {}; | |
1797 | size_t original_payload_size; | |
1798 | size_t payload_size; | |
1799 | ||
1800 | ret = setup_empty_lttng_msg(cmd_ctx); | |
1801 | if (ret) { | |
1802 | ret = LTTNG_ERR_NOMEM; | |
1803 | goto setup_error; | |
917a718d JG |
1804 | } |
1805 | ||
e368fb43 | 1806 | original_payload_size = cmd_ctx->reply_payload.buffer.size; |
917a718d | 1807 | |
e368fb43 JG |
1808 | /* Extended infos are included at the end of the payload. */ |
1809 | list_ret = cmd_list_events(cmd_ctx->lsm.domain.type, | |
1810 | cmd_ctx->session, | |
1811 | cmd_ctx->lsm.u.list.channel_name, | |
1812 | &cmd_ctx->reply_payload); | |
1813 | if (list_ret < 0) { | |
1814 | /* Return value is a negative lttng_error_code. */ | |
1815 | ret = -list_ret; | |
1816 | goto error; | |
917a718d JG |
1817 | } |
1818 | ||
e368fb43 JG |
1819 | payload_size = cmd_ctx->reply_payload.buffer.size - |
1820 | sizeof(cmd_header) - original_payload_size; | |
1821 | update_lttng_msg(cmd_ctx, sizeof(cmd_header), payload_size); | |
1822 | ||
917a718d JG |
1823 | ret = LTTNG_OK; |
1824 | break; | |
1825 | } | |
1826 | case LTTNG_LIST_SESSIONS: | |
1827 | { | |
1828 | unsigned int nr_sessions; | |
1829 | void *sessions_payload; | |
1830 | size_t payload_len; | |
1831 | ||
1832 | session_lock_list(); | |
1833 | nr_sessions = lttng_sessions_count( | |
1834 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1835 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e JG |
1836 | |
1837 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + | |
1838 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
917a718d JG |
1839 | sessions_payload = zmalloc(payload_len); |
1840 | ||
1841 | if (!sessions_payload) { | |
1842 | session_unlock_list(); | |
1843 | ret = -ENOMEM; | |
1844 | goto setup_error; | |
1845 | } | |
1846 | ||
b178f53e | 1847 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
917a718d JG |
1848 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
1849 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
1850 | session_unlock_list(); | |
1851 | ||
1852 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
1853 | payload_len); | |
1854 | free(sessions_payload); | |
1855 | ||
1856 | if (ret < 0) { | |
1857 | goto setup_error; | |
1858 | } | |
1859 | ||
1860 | ret = LTTNG_OK; | |
1861 | break; | |
1862 | } | |
1863 | case LTTNG_REGISTER_CONSUMER: | |
1864 | { | |
1865 | struct consumer_data *cdata; | |
1866 | ||
3a91de3a | 1867 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1868 | case LTTNG_DOMAIN_KERNEL: |
1869 | cdata = &kconsumer_data; | |
1870 | break; | |
1871 | default: | |
1872 | ret = LTTNG_ERR_UND; | |
1873 | goto error; | |
1874 | } | |
1875 | ||
3a91de3a JG |
1876 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1877 | cmd_ctx->lsm.u.reg.path, cdata); | |
917a718d JG |
1878 | break; |
1879 | } | |
1880 | case LTTNG_DATA_PENDING: | |
1881 | { | |
1882 | int pending_ret; | |
1883 | uint8_t pending_ret_byte; | |
1884 | ||
1885 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
1886 | ||
1887 | /* | |
1888 | * FIXME | |
1889 | * | |
1890 | * This function may returns 0 or 1 to indicate whether or not | |
1891 | * there is data pending. In case of error, it should return an | |
1892 | * LTTNG_ERR code. However, some code paths may still return | |
1893 | * a nondescript error code, which we handle by returning an | |
1894 | * "unknown" error. | |
1895 | */ | |
1896 | if (pending_ret == 0 || pending_ret == 1) { | |
1897 | /* | |
1898 | * ret will be set to LTTNG_OK at the end of | |
1899 | * this function. | |
1900 | */ | |
1901 | } else if (pending_ret < 0) { | |
1902 | ret = LTTNG_ERR_UNK; | |
1903 | goto setup_error; | |
1904 | } else { | |
1905 | ret = pending_ret; | |
1906 | goto setup_error; | |
1907 | } | |
1908 | ||
1909 | pending_ret_byte = (uint8_t) pending_ret; | |
1910 | ||
1911 | /* 1 byte to return whether or not data is pending */ | |
1912 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
1913 | &pending_ret_byte, 1); | |
1914 | ||
1915 | if (ret < 0) { | |
1916 | goto setup_error; | |
1917 | } | |
1918 | ||
1919 | ret = LTTNG_OK; | |
1920 | break; | |
1921 | } | |
1922 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
1923 | { | |
a914e76a | 1924 | uint32_t snapshot_id; |
917a718d JG |
1925 | struct lttcomm_lttng_output_id reply; |
1926 | ||
1927 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3a91de3a | 1928 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output), |
df4f5a87 | 1929 | &snapshot_id); |
917a718d JG |
1930 | if (ret != LTTNG_OK) { |
1931 | goto error; | |
1932 | } | |
a914e76a | 1933 | reply.id = snapshot_id; |
917a718d JG |
1934 | |
1935 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
1936 | sizeof(reply)); | |
1937 | if (ret < 0) { | |
1938 | goto setup_error; | |
1939 | } | |
1940 | ||
1941 | /* Copy output list into message payload */ | |
1942 | ret = LTTNG_OK; | |
1943 | break; | |
1944 | } | |
1945 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
1946 | { | |
1947 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
3a91de3a | 1948 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output)); |
917a718d JG |
1949 | break; |
1950 | } | |
1951 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
1952 | { | |
1953 | ssize_t nb_output; | |
1954 | struct lttng_snapshot_output *outputs = NULL; | |
1955 | ||
1956 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
1957 | if (nb_output < 0) { | |
1958 | ret = -nb_output; | |
1959 | goto error; | |
1960 | } | |
1961 | ||
1962 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
1963 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
1964 | nb_output * sizeof(struct lttng_snapshot_output)); | |
1965 | free(outputs); | |
1966 | ||
1967 | if (ret < 0) { | |
1968 | goto setup_error; | |
1969 | } | |
1970 | ||
1971 | ret = LTTNG_OK; | |
1972 | break; | |
1973 | } | |
1974 | case LTTNG_SNAPSHOT_RECORD: | |
1975 | { | |
1976 | ret = cmd_snapshot_record(cmd_ctx->session, | |
3a91de3a JG |
1977 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_record.output), |
1978 | cmd_ctx->lsm.u.snapshot_record.wait); | |
917a718d JG |
1979 | break; |
1980 | } | |
b178f53e | 1981 | case LTTNG_CREATE_SESSION_EXT: |
917a718d | 1982 | { |
b178f53e JG |
1983 | struct lttng_dynamic_buffer payload; |
1984 | struct lttng_session_descriptor *return_descriptor = NULL; | |
917a718d | 1985 | |
b178f53e | 1986 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 1987 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
1988 | if (ret != LTTNG_OK) { |
1989 | goto error; | |
917a718d JG |
1990 | } |
1991 | ||
b178f53e JG |
1992 | ret = lttng_session_descriptor_serialize(return_descriptor, |
1993 | &payload); | |
1994 | if (ret) { | |
1995 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
1996 | lttng_session_descriptor_destroy(return_descriptor); | |
1997 | ret = LTTNG_ERR_NOMEM; | |
1998 | goto error; | |
917a718d | 1999 | } |
b178f53e JG |
2000 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
2001 | payload.size); | |
2002 | if (ret) { | |
2003 | lttng_session_descriptor_destroy(return_descriptor); | |
2004 | ret = LTTNG_ERR_NOMEM; | |
2005 | goto error; | |
2006 | } | |
2007 | lttng_dynamic_buffer_reset(&payload); | |
2008 | lttng_session_descriptor_destroy(return_descriptor); | |
2009 | ret = LTTNG_OK; | |
917a718d JG |
2010 | break; |
2011 | } | |
2012 | case LTTNG_SAVE_SESSION: | |
2013 | { | |
3a91de3a | 2014 | ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr, |
917a718d JG |
2015 | &cmd_ctx->creds); |
2016 | break; | |
2017 | } | |
2018 | case LTTNG_SET_SESSION_SHM_PATH: | |
2019 | { | |
2020 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
3a91de3a | 2021 | cmd_ctx->lsm.u.set_shm_path.shm_path); |
917a718d JG |
2022 | break; |
2023 | } | |
2024 | case LTTNG_REGENERATE_METADATA: | |
2025 | { | |
2026 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
2027 | break; | |
2028 | } | |
2029 | case LTTNG_REGENERATE_STATEDUMP: | |
2030 | { | |
2031 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
2032 | break; | |
2033 | } | |
2034 | case LTTNG_REGISTER_TRIGGER: | |
2035 | { | |
242388e4 JR |
2036 | struct lttng_trigger *return_trigger; |
2037 | size_t original_payload_size; | |
2038 | size_t payload_size; | |
2039 | ||
2040 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2041 | if (ret) { | |
2042 | ret = LTTNG_ERR_NOMEM; | |
2043 | goto setup_error; | |
2044 | } | |
2045 | ||
2046 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2047 | ||
3e3665b8 | 2048 | ret = cmd_register_trigger(cmd_ctx, *sock, |
242388e4 JR |
2049 | notification_thread_handle, &return_trigger); |
2050 | if (ret != LTTNG_OK) { | |
2051 | goto error; | |
2052 | } | |
2053 | ||
2054 | ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload); | |
2055 | if (ret) { | |
2056 | ERR("Failed to serialize trigger in reply to \"register trigger\" command"); | |
2057 | ret = LTTNG_ERR_NOMEM; | |
2058 | lttng_trigger_destroy(return_trigger); | |
2059 | goto error; | |
2060 | } | |
2061 | ||
2062 | lttng_trigger_destroy(return_trigger); | |
2063 | return_trigger = NULL; | |
2064 | ||
2065 | payload_size = cmd_ctx->reply_payload.buffer.size - | |
2066 | original_payload_size; | |
2067 | ||
2068 | update_lttng_msg(cmd_ctx, 0, payload_size); | |
2069 | ||
2070 | ret = LTTNG_OK; | |
917a718d JG |
2071 | break; |
2072 | } | |
2073 | case LTTNG_UNREGISTER_TRIGGER: | |
2074 | { | |
3e3665b8 | 2075 | ret = cmd_unregister_trigger(cmd_ctx, *sock, |
917a718d JG |
2076 | notification_thread_handle); |
2077 | break; | |
2078 | } | |
2079 | case LTTNG_ROTATE_SESSION: | |
2080 | { | |
2081 | struct lttng_rotate_session_return rotate_return; | |
2082 | ||
2083 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
2084 | ||
2085 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
2086 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2087 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2088 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2089 | goto error; | |
2090 | } | |
2091 | ||
7fdbed1c | 2092 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
343defc2 MD |
2093 | false, |
2094 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
917a718d JG |
2095 | if (ret < 0) { |
2096 | ret = -ret; | |
2097 | goto error; | |
2098 | } | |
2099 | ||
2100 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
2101 | sizeof(rotate_return)); | |
2102 | if (ret < 0) { | |
2103 | ret = -ret; | |
2104 | goto error; | |
2105 | } | |
2106 | ||
2107 | ret = LTTNG_OK; | |
2108 | break; | |
2109 | } | |
2110 | case LTTNG_ROTATION_GET_INFO: | |
2111 | { | |
2112 | struct lttng_rotation_get_info_return get_info_return; | |
2113 | ||
2114 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
2115 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
3a91de3a | 2116 | cmd_ctx->lsm.u.get_rotation_info.rotation_id); |
917a718d JG |
2117 | if (ret < 0) { |
2118 | ret = -ret; | |
2119 | goto error; | |
2120 | } | |
2121 | ||
2122 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
2123 | sizeof(get_info_return)); | |
2124 | if (ret < 0) { | |
2125 | ret = -ret; | |
2126 | goto error; | |
2127 | } | |
2128 | ||
2129 | ret = LTTNG_OK; | |
2130 | break; | |
2131 | } | |
2132 | case LTTNG_ROTATION_SET_SCHEDULE: | |
2133 | { | |
2134 | bool set_schedule; | |
2135 | enum lttng_rotation_schedule_type schedule_type; | |
2136 | uint64_t value; | |
2137 | ||
2138 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2139 | DBG("Kernel tracer version does not support session rotations"); | |
2140 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2141 | goto error; | |
2142 | } | |
2143 | ||
3a91de3a JG |
2144 | set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1; |
2145 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type; | |
2146 | value = cmd_ctx->lsm.u.rotation_set_schedule.value; | |
917a718d JG |
2147 | |
2148 | ret = cmd_rotation_set_schedule(cmd_ctx->session, | |
2149 | set_schedule, | |
2150 | schedule_type, | |
2151 | value, | |
2152 | notification_thread_handle); | |
2153 | if (ret != LTTNG_OK) { | |
2154 | goto error; | |
2155 | } | |
2156 | ||
2157 | break; | |
2158 | } | |
2159 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
2160 | { | |
2161 | struct lttng_session_list_schedules_return schedules = { | |
2162 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
2163 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
2164 | .size.set = !!cmd_ctx->session->rotate_size, | |
2165 | .size.value = cmd_ctx->session->rotate_size, | |
2166 | }; | |
2167 | ||
2168 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
2169 | sizeof(schedules)); | |
2170 | if (ret < 0) { | |
2171 | ret = -ret; | |
2172 | goto error; | |
2173 | } | |
2174 | ||
2175 | ret = LTTNG_OK; | |
2176 | break; | |
2177 | } | |
022349df MD |
2178 | case LTTNG_CLEAR_SESSION: |
2179 | { | |
2180 | ret = cmd_clear_session(cmd_ctx->session, sock); | |
2181 | break; | |
2182 | } | |
917a718d JG |
2183 | default: |
2184 | ret = LTTNG_ERR_UND; | |
2185 | break; | |
2186 | } | |
2187 | ||
2188 | error: | |
3a91de3a JG |
2189 | if (cmd_ctx->reply_payload.buffer.size == 0) { |
2190 | DBG("Missing llm header, creating one."); | |
917a718d JG |
2191 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
2192 | goto setup_error; | |
2193 | } | |
2194 | } | |
2195 | /* Set return code */ | |
3a91de3a | 2196 | ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret; |
917a718d JG |
2197 | setup_error: |
2198 | if (cmd_ctx->session) { | |
2199 | session_unlock(cmd_ctx->session); | |
2200 | session_put(cmd_ctx->session); | |
3e3665b8 | 2201 | cmd_ctx->session = NULL; |
917a718d JG |
2202 | } |
2203 | if (need_tracing_session) { | |
2204 | session_unlock_list(); | |
2205 | } | |
2206 | init_setup_error: | |
2207 | assert(!rcu_read_ongoing()); | |
2208 | return ret; | |
2209 | } | |
2210 | ||
2211 | static int create_client_sock(void) | |
2212 | { | |
2213 | int ret, client_sock; | |
2214 | const mode_t old_umask = umask(0); | |
2215 | ||
2216 | /* Create client tool unix socket */ | |
2217 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); | |
2218 | if (client_sock < 0) { | |
2219 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); | |
2220 | ret = -1; | |
2221 | goto end; | |
2222 | } | |
2223 | ||
2224 | /* Set the cloexec flag */ | |
2225 | ret = utils_set_fd_cloexec(client_sock); | |
2226 | if (ret < 0) { | |
2227 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
2228 | "Continuing but note that the consumer daemon will have a " | |
2229 | "reference to this socket on exec()", client_sock); | |
2230 | } | |
2231 | ||
2232 | /* File permission MUST be 660 */ | |
2233 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2234 | if (ret < 0) { | |
18972083 JR |
2235 | ERR("Set file permissions failed: %s", |
2236 | config.client_unix_sock_path.value); | |
917a718d | 2237 | PERROR("chmod"); |
18972083 JR |
2238 | (void) lttcomm_close_unix_sock(client_sock); |
2239 | ret = -1; | |
917a718d JG |
2240 | goto end; |
2241 | } | |
2242 | DBG("Created client socket (fd = %i)", client_sock); | |
2243 | ret = client_sock; | |
2244 | end: | |
2245 | umask(old_umask); | |
2246 | return ret; | |
2247 | } | |
2248 | ||
2249 | static void cleanup_client_thread(void *data) | |
2250 | { | |
2251 | struct lttng_pipe *quit_pipe = data; | |
2252 | ||
2253 | lttng_pipe_destroy(quit_pipe); | |
2254 | } | |
2255 | ||
6cb45e93 JG |
2256 | static void thread_init_cleanup(void *data) |
2257 | { | |
2258 | set_thread_status(false); | |
2259 | } | |
2260 | ||
917a718d JG |
2261 | /* |
2262 | * This thread manage all clients request using the unix client socket for | |
2263 | * communication. | |
2264 | */ | |
2265 | static void *thread_manage_clients(void *data) | |
2266 | { | |
2267 | int sock = -1, ret, i, pollfd, err = -1; | |
2268 | int sock_error; | |
2269 | uint32_t revents, nb_fd; | |
917a718d | 2270 | struct lttng_poll_event events; |
0f68efb6 | 2271 | const int client_sock = thread_state.client_sock; |
917a718d JG |
2272 | struct lttng_pipe *quit_pipe = data; |
2273 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
3a91de3a | 2274 | struct command_ctx cmd_ctx = {}; |
917a718d JG |
2275 | |
2276 | DBG("[thread] Manage client started"); | |
2277 | ||
3a91de3a JG |
2278 | lttng_payload_init(&cmd_ctx.reply_payload); |
2279 | ||
917a718d JG |
2280 | is_root = (getuid() == 0); |
2281 | ||
6cb45e93 | 2282 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2283 | |
2284 | rcu_register_thread(); | |
2285 | ||
2286 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); | |
2287 | ||
2288 | health_code_update(); | |
2289 | ||
2290 | ret = lttcomm_listen_unix_sock(client_sock); | |
2291 | if (ret < 0) { | |
2292 | goto error_listen; | |
2293 | } | |
2294 | ||
2295 | /* | |
2296 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2297 | * more will be added to this poll set. | |
2298 | */ | |
2299 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2300 | if (ret < 0) { | |
2301 | goto error_create_poll; | |
2302 | } | |
2303 | ||
2304 | /* Add the application registration socket */ | |
2305 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2306 | if (ret < 0) { | |
2307 | goto error; | |
2308 | } | |
2309 | ||
2310 | /* Add thread quit pipe */ | |
2311 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2312 | if (ret < 0) { | |
2313 | goto error; | |
2314 | } | |
2315 | ||
6cb45e93 | 2316 | /* Set state as running. */ |
0d163d56 | 2317 | set_thread_status(true); |
6cb45e93 JG |
2318 | pthread_cleanup_pop(0); |
2319 | ||
917a718d JG |
2320 | /* This testpoint is after we signal readiness to the parent. */ |
2321 | if (testpoint(sessiond_thread_manage_clients)) { | |
2322 | goto error; | |
2323 | } | |
2324 | ||
2325 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2326 | goto error; | |
2327 | } | |
2328 | ||
2329 | health_code_update(); | |
2330 | ||
917a718d JG |
2331 | while (1) { |
2332 | const struct cmd_completion_handler *cmd_completion_handler; | |
2333 | ||
3a91de3a JG |
2334 | cmd_ctx.creds = (lttng_sock_cred) { |
2335 | .uid = UINT32_MAX, | |
2336 | .gid = UINT32_MAX, | |
2337 | }; | |
2338 | cmd_ctx.session = NULL; | |
fe489250 | 2339 | lttng_payload_clear(&cmd_ctx.reply_payload); |
e368fb43 | 2340 | cmd_ctx.lttng_msg_size = 0; |
3a91de3a | 2341 | |
917a718d JG |
2342 | DBG("Accepting client command ..."); |
2343 | ||
2344 | /* Inifinite blocking call, waiting for transmission */ | |
2345 | restart: | |
2346 | health_poll_entry(); | |
2347 | ret = lttng_poll_wait(&events, -1); | |
2348 | health_poll_exit(); | |
2349 | if (ret < 0) { | |
2350 | /* | |
2351 | * Restart interrupted system call. | |
2352 | */ | |
2353 | if (errno == EINTR) { | |
2354 | goto restart; | |
2355 | } | |
2356 | goto error; | |
2357 | } | |
2358 | ||
2359 | nb_fd = ret; | |
2360 | ||
2361 | for (i = 0; i < nb_fd; i++) { | |
2362 | revents = LTTNG_POLL_GETEV(&events, i); | |
2363 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2364 | ||
2365 | health_code_update(); | |
2366 | ||
917a718d JG |
2367 | if (pollfd == thread_quit_pipe_fd) { |
2368 | err = 0; | |
2369 | goto exit; | |
2370 | } else { | |
2371 | /* Event on the registration socket */ | |
2372 | if (revents & LPOLLIN) { | |
2373 | continue; | |
2374 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2375 | ERR("Client socket poll error"); | |
2376 | goto error; | |
2377 | } else { | |
2378 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2379 | goto error; | |
2380 | } | |
2381 | } | |
2382 | } | |
2383 | ||
2384 | DBG("Wait for client response"); | |
2385 | ||
2386 | health_code_update(); | |
2387 | ||
2388 | sock = lttcomm_accept_unix_sock(client_sock); | |
2389 | if (sock < 0) { | |
2390 | goto error; | |
2391 | } | |
2392 | ||
2393 | /* | |
2394 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2395 | * show must go on. | |
2396 | */ | |
2397 | (void) utils_set_fd_cloexec(sock); | |
2398 | ||
2399 | /* Set socket option for credentials retrieval */ | |
2400 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2401 | if (ret < 0) { | |
2402 | goto error; | |
2403 | } | |
2404 | ||
917a718d JG |
2405 | health_code_update(); |
2406 | ||
2407 | /* | |
2408 | * Data is received from the lttng client. The struct | |
2409 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2410 | * the client. | |
2411 | */ | |
2412 | DBG("Receiving data from client ..."); | |
3a91de3a JG |
2413 | ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm, |
2414 | sizeof(struct lttcomm_session_msg), &cmd_ctx.creds); | |
2415 | if (ret != sizeof(struct lttcomm_session_msg)) { | |
2416 | DBG("Incomplete recv() from client... continuing"); | |
917a718d JG |
2417 | ret = close(sock); |
2418 | if (ret) { | |
2419 | PERROR("close"); | |
2420 | } | |
2421 | sock = -1; | |
917a718d JG |
2422 | continue; |
2423 | } | |
2424 | ||
2425 | health_code_update(); | |
2426 | ||
2427 | // TODO: Validate cmd_ctx including sanity check for | |
2428 | // security purpose. | |
2429 | ||
2430 | rcu_thread_online(); | |
2431 | /* | |
2432 | * This function dispatch the work to the kernel or userspace tracer | |
2433 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2434 | * informations for the client. The command context struct contains | |
2435 | * everything this function may needs. | |
2436 | */ | |
3a91de3a | 2437 | ret = process_client_msg(&cmd_ctx, &sock, &sock_error); |
917a718d JG |
2438 | rcu_thread_offline(); |
2439 | if (ret < 0) { | |
3e3665b8 JG |
2440 | if (sock >= 0) { |
2441 | ret = close(sock); | |
2442 | if (ret) { | |
2443 | PERROR("close"); | |
2444 | } | |
4a76dfd3 JR |
2445 | } |
2446 | sock = -1; | |
917a718d JG |
2447 | /* |
2448 | * TODO: Inform client somehow of the fatal error. At | |
2449 | * this point, ret < 0 means that a zmalloc failed | |
2450 | * (ENOMEM). Error detected but still accept | |
2451 | * command, unless a socket error has been | |
2452 | * detected. | |
2453 | */ | |
917a718d JG |
2454 | continue; |
2455 | } | |
2456 | ||
2457 | cmd_completion_handler = cmd_pop_completion_handler(); | |
2458 | if (cmd_completion_handler) { | |
2459 | enum lttng_error_code completion_code; | |
2460 | ||
2461 | completion_code = cmd_completion_handler->run( | |
2462 | cmd_completion_handler->data); | |
2463 | if (completion_code != LTTNG_OK) { | |
917a718d JG |
2464 | continue; |
2465 | } | |
2466 | } | |
2467 | ||
2468 | health_code_update(); | |
2469 | ||
3e3665b8 | 2470 | if (sock >= 0) { |
3a91de3a JG |
2471 | struct lttng_payload_view view = |
2472 | lttng_payload_view_from_payload( | |
2473 | &cmd_ctx.reply_payload, | |
2474 | 0, -1); | |
e368fb43 | 2475 | struct lttcomm_lttng_msg *llm = (typeof( |
3a91de3a JG |
2476 | llm)) cmd_ctx.reply_payload.buffer.data; |
2477 | ||
2478 | assert(cmd_ctx.reply_payload.buffer.size >= | |
2479 | sizeof(llm)); | |
2480 | assert(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size); | |
2481 | ||
fe489250 | 2482 | llm->fd_count = lttng_payload_view_get_fd_handle_count(&view); |
e368fb43 | 2483 | |
3e3665b8 | 2484 | DBG("Sending response (size: %d, retcode: %s (%d))", |
3a91de3a JG |
2485 | cmd_ctx.lttng_msg_size, |
2486 | lttng_strerror(-llm->ret_code), | |
2487 | llm->ret_code); | |
2488 | ret = send_unix_sock(sock, &view); | |
3e3665b8 JG |
2489 | if (ret < 0) { |
2490 | ERR("Failed to send data back to client"); | |
2491 | } | |
917a718d | 2492 | |
3e3665b8 JG |
2493 | /* End of transmission */ |
2494 | ret = close(sock); | |
2495 | if (ret) { | |
2496 | PERROR("close"); | |
2497 | } | |
4a76dfd3 JR |
2498 | } |
2499 | sock = -1; | |
917a718d | 2500 | |
917a718d JG |
2501 | health_code_update(); |
2502 | } | |
2503 | ||
2504 | exit: | |
2505 | error: | |
2506 | if (sock >= 0) { | |
2507 | ret = close(sock); | |
2508 | if (ret) { | |
2509 | PERROR("close"); | |
2510 | } | |
2511 | } | |
2512 | ||
2513 | lttng_poll_clean(&events); | |
917a718d JG |
2514 | |
2515 | error_listen: | |
2516 | error_create_poll: | |
2517 | unlink(config.client_unix_sock_path.value); | |
0f68efb6 JG |
2518 | ret = close(client_sock); |
2519 | if (ret) { | |
2520 | PERROR("close"); | |
917a718d JG |
2521 | } |
2522 | ||
2523 | if (err) { | |
2524 | health_error(); | |
2525 | ERR("Health error occurred in %s", __func__); | |
2526 | } | |
2527 | ||
2528 | health_unregister(health_sessiond); | |
2529 | ||
2530 | DBG("Client thread dying"); | |
3a91de3a | 2531 | lttng_payload_reset(&cmd_ctx.reply_payload); |
917a718d | 2532 | rcu_unregister_thread(); |
917a718d JG |
2533 | return NULL; |
2534 | } | |
2535 | ||
2536 | static | |
2537 | bool shutdown_client_thread(void *thread_data) | |
2538 | { | |
2539 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2540 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2541 | ||
2542 | return notify_thread_pipe(write_fd) == 1; | |
2543 | } | |
2544 | ||
2545 | struct lttng_thread *launch_client_thread(void) | |
2546 | { | |
6cb45e93 | 2547 | bool thread_running; |
917a718d | 2548 | struct lttng_pipe *client_quit_pipe; |
0f68efb6 JG |
2549 | struct lttng_thread *thread = NULL; |
2550 | int client_sock_fd = -1; | |
917a718d | 2551 | |
6cb45e93 | 2552 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2553 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2554 | if (!client_quit_pipe) { | |
2555 | goto error; | |
2556 | } | |
2557 | ||
0f68efb6 JG |
2558 | client_sock_fd = create_client_sock(); |
2559 | if (client_sock_fd < 0) { | |
2560 | goto error; | |
2561 | } | |
2562 | ||
2563 | thread_state.client_sock = client_sock_fd; | |
917a718d JG |
2564 | thread = lttng_thread_create("Client management", |
2565 | thread_manage_clients, | |
2566 | shutdown_client_thread, | |
2567 | cleanup_client_thread, | |
2568 | client_quit_pipe); | |
2569 | if (!thread) { | |
2570 | goto error; | |
2571 | } | |
0f68efb6 JG |
2572 | /* The client thread now owns the client sock fd and the quit pipe. */ |
2573 | client_sock_fd = -1; | |
2574 | client_quit_pipe = NULL; | |
917a718d JG |
2575 | |
2576 | /* | |
2577 | * This thread is part of the threads that need to be fully | |
2578 | * initialized before the session daemon is marked as "ready". | |
2579 | */ | |
6cb45e93 JG |
2580 | thread_running = wait_thread_status(); |
2581 | if (!thread_running) { | |
0f68efb6 | 2582 | goto error; |
6cb45e93 | 2583 | } |
917a718d JG |
2584 | return thread; |
2585 | error: | |
0f68efb6 JG |
2586 | if (client_sock_fd >= 0) { |
2587 | if (close(client_sock_fd)) { | |
2588 | PERROR("Failed to close client socket"); | |
2589 | } | |
2590 | } | |
2591 | lttng_thread_put(thread); | |
917a718d JG |
2592 | cleanup_client_thread(client_quit_pipe); |
2593 | return NULL; | |
2594 | } |