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> |
c3e68e71 JR |
27 | #include <lttng/map/map.h> |
28 | #include <lttng/map/map-internal.h> | |
29 | #include <lttng/map/map-query-internal.h> | |
b178f53e | 30 | #include <lttng/session-descriptor-internal.h> |
159b042f JG |
31 | #include <lttng/session-internal.h> |
32 | #include <lttng/userspace-probe-internal.h> | |
33 | #include <pthread.h> | |
34 | #include <signal.h> | |
35 | #include <stddef.h> | |
36 | #include <sys/stat.h> | |
1434fd36 | 37 | #include <unistd.h> |
917a718d JG |
38 | |
39 | #include "client.h" | |
40 | #include "lttng-sessiond.h" | |
41 | #include "cmd.h" | |
42 | #include "kernel.h" | |
43 | #include "save.h" | |
44 | #include "health-sessiond.h" | |
45 | #include "testpoint.h" | |
46 | #include "utils.h" | |
4ec029ed | 47 | #include "manage-consumer.h" |
022349df | 48 | #include "clear.h" |
44760c20 | 49 | #include "agent-thread.h" |
917a718d JG |
50 | |
51 | static bool is_root; | |
52 | ||
53 | static struct thread_state { | |
6cb45e93 JG |
54 | sem_t ready; |
55 | bool running; | |
0f68efb6 | 56 | int client_sock; |
6cb45e93 JG |
57 | } thread_state; |
58 | ||
59 | static void set_thread_status(bool running) | |
917a718d | 60 | { |
6cb45e93 JG |
61 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
62 | thread_state.running = running; | |
63 | sem_post(&thread_state.ready); | |
917a718d JG |
64 | } |
65 | ||
6cb45e93 | 66 | static bool wait_thread_status(void) |
917a718d | 67 | { |
6cb45e93 JG |
68 | DBG("Waiting for client thread to be ready"); |
69 | sem_wait(&thread_state.ready); | |
70 | if (thread_state.running) { | |
71 | DBG("Client thread is ready"); | |
72 | } else { | |
73 | ERR("Initialization of client thread failed"); | |
917a718d | 74 | } |
6cb45e93 JG |
75 | |
76 | return thread_state.running; | |
917a718d JG |
77 | } |
78 | ||
79 | /* | |
80 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
81 | * right amount of memory and copying the original information from the lsm | |
82 | * structure. | |
83 | * | |
84 | * Return 0 on success, negative value on error. | |
85 | */ | |
86 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
87 | const void *payload_buf, size_t payload_len, | |
88 | const void *cmd_header_buf, size_t cmd_header_len) | |
89 | { | |
90 | int ret = 0; | |
91 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
917a718d | 92 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; |
3a91de3a JG |
93 | const struct lttcomm_lttng_msg llm = { |
94 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
95 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
96 | .cmd_header_size = cmd_header_len, | |
97 | .data_size = payload_len, | |
98 | }; | |
917a718d | 99 | |
2eb1b01f JR |
100 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
101 | if (ret) { | |
102 | goto end; | |
103 | } | |
104 | ||
fe489250 | 105 | lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles); |
917a718d | 106 | |
3a91de3a JG |
107 | cmd_ctx->lttng_msg_size = total_msg_size; |
108 | ||
109 | /* Append reply header. */ | |
110 | ret = lttng_dynamic_buffer_append( | |
111 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
112 | if (ret) { | |
917a718d JG |
113 | goto end; |
114 | } | |
115 | ||
3a91de3a | 116 | /* Append command header. */ |
917a718d | 117 | if (cmd_header_len) { |
3a91de3a JG |
118 | ret = lttng_dynamic_buffer_append( |
119 | &cmd_ctx->reply_payload.buffer, cmd_header_buf, | |
120 | cmd_header_len); | |
121 | if (ret) { | |
122 | goto end; | |
123 | } | |
917a718d JG |
124 | } |
125 | ||
3a91de3a | 126 | /* Append payload. */ |
917a718d | 127 | if (payload_len) { |
3a91de3a JG |
128 | ret = lttng_dynamic_buffer_append( |
129 | &cmd_ctx->reply_payload.buffer, payload_buf, | |
130 | payload_len); | |
131 | if (ret) { | |
132 | goto end; | |
133 | } | |
917a718d JG |
134 | } |
135 | ||
136 | end: | |
137 | return ret; | |
138 | } | |
139 | ||
e368fb43 JG |
140 | static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx) |
141 | { | |
142 | int ret; | |
143 | const struct lttcomm_lttng_msg llm = {}; | |
144 | ||
64defc29 JR |
145 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
146 | if (ret) { | |
147 | goto end; | |
148 | } | |
e368fb43 JG |
149 | |
150 | /* Append place-holder reply header. */ | |
151 | ret = lttng_dynamic_buffer_append( | |
152 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
153 | if (ret) { | |
154 | goto end; | |
155 | } | |
156 | ||
157 | cmd_ctx->lttng_msg_size = sizeof(llm); | |
158 | end: | |
159 | return ret; | |
160 | } | |
161 | ||
162 | static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len, | |
163 | size_t payload_len) | |
164 | { | |
165 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
166 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
167 | const struct lttcomm_lttng_msg llm = { | |
168 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
169 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
170 | .cmd_header_size = cmd_header_len, | |
171 | .data_size = payload_len, | |
172 | }; | |
173 | struct lttcomm_lttng_msg *p_llm; | |
174 | ||
175 | assert(cmd_ctx->reply_payload.buffer.size >= sizeof(llm)); | |
176 | ||
177 | p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data; | |
178 | ||
179 | /* Update existing header. */ | |
180 | memcpy(p_llm, &llm, sizeof(llm)); | |
181 | ||
182 | cmd_ctx->lttng_msg_size = total_msg_size; | |
183 | } | |
184 | ||
917a718d JG |
185 | /* |
186 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 187 | * exec or it will fail. |
917a718d JG |
188 | */ |
189 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
190 | { | |
4ec029ed | 191 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
192 | } |
193 | ||
194 | /* | |
195 | * Fork and exec a consumer daemon (consumerd). | |
196 | * | |
197 | * Return pid if successful else -1. | |
198 | */ | |
199 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
200 | { | |
201 | int ret; | |
202 | pid_t pid; | |
203 | const char *consumer_to_use; | |
204 | const char *verbosity; | |
205 | struct stat st; | |
206 | ||
207 | DBG("Spawning consumerd"); | |
208 | ||
209 | pid = fork(); | |
210 | if (pid == 0) { | |
211 | /* | |
212 | * Exec consumerd. | |
213 | */ | |
214 | if (config.verbose_consumer) { | |
215 | verbosity = "--verbose"; | |
216 | } else if (lttng_opt_quiet) { | |
217 | verbosity = "--quiet"; | |
218 | } else { | |
219 | verbosity = ""; | |
220 | } | |
221 | ||
222 | switch (consumer_data->type) { | |
223 | case LTTNG_CONSUMER_KERNEL: | |
224 | /* | |
225 | * Find out which consumerd to execute. We will first try the | |
226 | * 64-bit path, then the sessiond's installation directory, and | |
227 | * fallback on the 32-bit one, | |
228 | */ | |
229 | DBG3("Looking for a kernel consumer at these locations:"); | |
230 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); | |
231 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); | |
232 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); | |
233 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { | |
234 | DBG3("Found location #1"); | |
235 | consumer_to_use = config.consumerd64_bin_path.value; | |
236 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
237 | DBG3("Found location #2"); | |
238 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
239 | } else if (config.consumerd32_bin_path.value && | |
240 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
241 | DBG3("Found location #3"); | |
242 | consumer_to_use = config.consumerd32_bin_path.value; | |
243 | } else { | |
244 | DBG("Could not find any valid consumerd executable"); | |
245 | ret = -EINVAL; | |
246 | goto error; | |
247 | } | |
248 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
249 | (void) execl(consumer_to_use, | |
250 | "lttng-consumerd", verbosity, "-k", | |
251 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
252 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
253 | "--group", config.tracing_group_name.value, | |
254 | NULL); | |
255 | break; | |
256 | case LTTNG_CONSUMER64_UST: | |
257 | { | |
258 | if (config.consumerd64_lib_dir.value) { | |
b53d4e59 | 259 | const char *tmp; |
917a718d JG |
260 | size_t tmplen; |
261 | char *tmpnew; | |
262 | ||
263 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
264 | if (!tmp) { | |
265 | tmp = ""; | |
266 | } | |
267 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
268 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
269 | if (!tmpnew) { | |
270 | ret = -ENOMEM; | |
271 | goto error; | |
272 | } | |
273 | strcat(tmpnew, config.consumerd64_lib_dir.value); | |
274 | if (tmp[0] != '\0') { | |
275 | strcat(tmpnew, ":"); | |
276 | strcat(tmpnew, tmp); | |
277 | } | |
278 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
279 | free(tmpnew); | |
280 | if (ret) { | |
281 | ret = -errno; | |
282 | goto error; | |
283 | } | |
284 | } | |
285 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); | |
286 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
287 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
288 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
289 | "--group", config.tracing_group_name.value, | |
290 | NULL); | |
291 | break; | |
292 | } | |
293 | case LTTNG_CONSUMER32_UST: | |
294 | { | |
295 | if (config.consumerd32_lib_dir.value) { | |
b53d4e59 | 296 | const char *tmp; |
917a718d JG |
297 | size_t tmplen; |
298 | char *tmpnew; | |
299 | ||
300 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
301 | if (!tmp) { | |
302 | tmp = ""; | |
303 | } | |
304 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
305 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
306 | if (!tmpnew) { | |
307 | ret = -ENOMEM; | |
308 | goto error; | |
309 | } | |
310 | strcat(tmpnew, config.consumerd32_lib_dir.value); | |
311 | if (tmp[0] != '\0') { | |
312 | strcat(tmpnew, ":"); | |
313 | strcat(tmpnew, tmp); | |
314 | } | |
315 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
316 | free(tmpnew); | |
317 | if (ret) { | |
318 | ret = -errno; | |
319 | goto error; | |
320 | } | |
321 | } | |
322 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); | |
323 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
324 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
325 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
326 | "--group", config.tracing_group_name.value, | |
327 | NULL); | |
328 | break; | |
329 | } | |
330 | default: | |
331 | ERR("unknown consumer type"); | |
332 | errno = 0; | |
333 | } | |
334 | if (errno != 0) { | |
335 | PERROR("Consumer execl()"); | |
336 | } | |
337 | /* Reaching this point, we got a failure on our execl(). */ | |
338 | exit(EXIT_FAILURE); | |
339 | } else if (pid > 0) { | |
340 | ret = pid; | |
341 | } else { | |
342 | PERROR("start consumer fork"); | |
343 | ret = -errno; | |
344 | } | |
345 | error: | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Spawn the consumerd daemon and session daemon thread. | |
351 | */ | |
352 | static int start_consumerd(struct consumer_data *consumer_data) | |
353 | { | |
354 | int ret; | |
355 | ||
356 | /* | |
357 | * Set the listen() state on the socket since there is a possible race | |
358 | * between the exec() of the consumer daemon and this call if place in the | |
359 | * consumer thread. See bug #366 for more details. | |
360 | */ | |
361 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
362 | if (ret < 0) { | |
363 | goto error; | |
364 | } | |
365 | ||
366 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
367 | if (consumer_data->pid != 0) { | |
368 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
369 | goto end; | |
370 | } | |
371 | ||
372 | ret = spawn_consumerd(consumer_data); | |
373 | if (ret < 0) { | |
374 | ERR("Spawning consumerd failed"); | |
375 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
376 | goto error; | |
377 | } | |
378 | ||
379 | /* Setting up the consumer_data pid */ | |
380 | consumer_data->pid = ret; | |
381 | DBG2("Consumer pid %d", consumer_data->pid); | |
382 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
383 | ||
384 | DBG2("Spawning consumer control thread"); | |
385 | ret = spawn_consumer_thread(consumer_data); | |
386 | if (ret < 0) { | |
387 | ERR("Fatal error spawning consumer control thread"); | |
388 | goto error; | |
389 | } | |
390 | ||
391 | end: | |
392 | return 0; | |
393 | ||
394 | error: | |
395 | /* Cleanup already created sockets on error. */ | |
396 | if (consumer_data->err_sock >= 0) { | |
397 | int err; | |
398 | ||
399 | err = close(consumer_data->err_sock); | |
400 | if (err < 0) { | |
401 | PERROR("close consumer data error socket"); | |
402 | } | |
403 | } | |
404 | return ret; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Copy consumer output from the tracing session to the domain session. The | |
409 | * function also applies the right modification on a per domain basis for the | |
410 | * trace files destination directory. | |
411 | * | |
412 | * Should *NOT* be called with RCU read-side lock held. | |
413 | */ | |
414 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
415 | { | |
416 | int ret; | |
417 | const char *dir_name; | |
418 | struct consumer_output *consumer; | |
419 | ||
420 | assert(session); | |
421 | assert(session->consumer); | |
422 | ||
423 | switch (domain) { | |
424 | case LTTNG_DOMAIN_KERNEL: | |
425 | DBG3("Copying tracing session consumer output in kernel session"); | |
426 | /* | |
427 | * XXX: We should audit the session creation and what this function | |
428 | * does "extra" in order to avoid a destroy since this function is used | |
429 | * in the domain session creation (kernel and ust) only. Same for UST | |
430 | * domain. | |
431 | */ | |
432 | if (session->kernel_session->consumer) { | |
433 | consumer_output_put(session->kernel_session->consumer); | |
434 | } | |
435 | session->kernel_session->consumer = | |
436 | consumer_copy_output(session->consumer); | |
437 | /* Ease our life a bit for the next part */ | |
438 | consumer = session->kernel_session->consumer; | |
439 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
440 | break; | |
441 | case LTTNG_DOMAIN_JUL: | |
442 | case LTTNG_DOMAIN_LOG4J: | |
443 | case LTTNG_DOMAIN_PYTHON: | |
444 | case LTTNG_DOMAIN_UST: | |
445 | DBG3("Copying tracing session consumer output in UST session"); | |
446 | if (session->ust_session->consumer) { | |
447 | consumer_output_put(session->ust_session->consumer); | |
448 | } | |
449 | session->ust_session->consumer = | |
450 | consumer_copy_output(session->consumer); | |
451 | /* Ease our life a bit for the next part */ | |
452 | consumer = session->ust_session->consumer; | |
453 | dir_name = DEFAULT_UST_TRACE_DIR; | |
454 | break; | |
455 | default: | |
456 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
457 | goto error; | |
458 | } | |
459 | ||
460 | /* Append correct directory to subdir */ | |
b178f53e JG |
461 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
462 | sizeof(consumer->domain_subdir)); | |
463 | if (ret) { | |
464 | ret = LTTNG_ERR_UNK; | |
465 | goto error; | |
466 | } | |
467 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
468 | ret = LTTNG_OK; |
469 | ||
470 | error: | |
471 | return ret; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Create an UST session and add it to the session ust list. | |
476 | * | |
477 | * Should *NOT* be called with RCU read-side lock held. | |
478 | */ | |
479 | static int create_ust_session(struct ltt_session *session, | |
df4f5a87 | 480 | const struct lttng_domain *domain) |
917a718d JG |
481 | { |
482 | int ret; | |
483 | struct ltt_ust_session *lus = NULL; | |
484 | ||
485 | assert(session); | |
486 | assert(domain); | |
487 | assert(session->consumer); | |
488 | ||
489 | switch (domain->type) { | |
490 | case LTTNG_DOMAIN_JUL: | |
491 | case LTTNG_DOMAIN_LOG4J: | |
492 | case LTTNG_DOMAIN_PYTHON: | |
493 | case LTTNG_DOMAIN_UST: | |
494 | break; | |
495 | default: | |
496 | ERR("Unknown UST domain on create session %d", domain->type); | |
497 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
498 | goto error; | |
499 | } | |
500 | ||
501 | DBG("Creating UST session"); | |
502 | ||
503 | lus = trace_ust_create_session(session->id); | |
504 | if (lus == NULL) { | |
505 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
506 | goto error; | |
507 | } | |
508 | ||
509 | lus->uid = session->uid; | |
510 | lus->gid = session->gid; | |
511 | lus->output_traces = session->output_traces; | |
512 | lus->snapshot_mode = session->snapshot_mode; | |
513 | lus->live_timer_interval = session->live_timer; | |
514 | session->ust_session = lus; | |
515 | if (session->shm_path[0]) { | |
516 | strncpy(lus->root_shm_path, session->shm_path, | |
517 | sizeof(lus->root_shm_path)); | |
518 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
519 | strncpy(lus->shm_path, session->shm_path, | |
520 | sizeof(lus->shm_path)); | |
521 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
522 | strncat(lus->shm_path, "/ust", | |
523 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
524 | } | |
525 | /* Copy session output to the newly created UST session */ | |
526 | ret = copy_session_consumer(domain->type, session); | |
527 | if (ret != LTTNG_OK) { | |
528 | goto error; | |
529 | } | |
530 | ||
531 | return LTTNG_OK; | |
532 | ||
533 | error: | |
534 | free(lus); | |
535 | session->ust_session = NULL; | |
536 | return ret; | |
537 | } | |
538 | ||
539 | /* | |
540 | * Create a kernel tracer session then create the default channel. | |
541 | */ | |
542 | static int create_kernel_session(struct ltt_session *session) | |
543 | { | |
544 | int ret; | |
545 | ||
546 | DBG("Creating kernel session"); | |
547 | ||
7d268848 | 548 | ret = kernel_create_session(session); |
917a718d JG |
549 | if (ret < 0) { |
550 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 551 | goto error_create; |
917a718d JG |
552 | } |
553 | ||
554 | /* Code flow safety */ | |
555 | assert(session->kernel_session); | |
556 | ||
557 | /* Copy session output to the newly created Kernel session */ | |
558 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
559 | if (ret != LTTNG_OK) { | |
560 | goto error; | |
561 | } | |
562 | ||
563 | session->kernel_session->uid = session->uid; | |
564 | session->kernel_session->gid = session->gid; | |
565 | session->kernel_session->output_traces = session->output_traces; | |
566 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
a2814ea7 | 567 | session->kernel_session->is_live_session = session->live_timer != 0; |
917a718d JG |
568 | |
569 | return LTTNG_OK; | |
570 | ||
571 | error: | |
572 | trace_kernel_destroy_session(session->kernel_session); | |
573 | session->kernel_session = NULL; | |
5d0a7bcb | 574 | error_create: |
917a718d JG |
575 | return ret; |
576 | } | |
577 | ||
578 | /* | |
579 | * Count number of session permitted by uid/gid. | |
580 | */ | |
581 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
582 | { | |
583 | unsigned int i = 0; | |
584 | struct ltt_session *session; | |
585 | const struct ltt_session_list *session_list = session_get_list(); | |
586 | ||
d7b377ed | 587 | DBG("Counting number of available session for UID %d", uid); |
917a718d JG |
588 | cds_list_for_each_entry(session, &session_list->head, list) { |
589 | if (!session_get(session)) { | |
590 | continue; | |
591 | } | |
592 | session_lock(session); | |
593 | /* Only count the sessions the user can control. */ | |
d7b377ed | 594 | if (session_access_ok(session, uid) && |
917a718d JG |
595 | !session->destroyed) { |
596 | i++; | |
597 | } | |
598 | session_unlock(session); | |
599 | session_put(session); | |
600 | } | |
601 | return i; | |
602 | } | |
603 | ||
604 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
605 | int *sock_error, struct lttng_event *event) | |
606 | { | |
fe489250 | 607 | int fd = -1, ret; |
917a718d | 608 | struct lttng_userspace_probe_location *probe_location; |
e368fb43 | 609 | struct lttng_payload probe_location_payload; |
fe489250 | 610 | struct fd_handle *handle = NULL; |
917a718d JG |
611 | |
612 | /* | |
e368fb43 | 613 | * Create a payload to store the serialized version of the probe |
917a718d JG |
614 | * location. |
615 | */ | |
e368fb43 JG |
616 | lttng_payload_init(&probe_location_payload); |
617 | ||
618 | ret = lttng_dynamic_buffer_set_size(&probe_location_payload.buffer, | |
3a91de3a | 619 | cmd_ctx->lsm.u.enable.userspace_probe_location_len); |
917a718d JG |
620 | if (ret) { |
621 | ret = LTTNG_ERR_NOMEM; | |
622 | goto error; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Receive the probe location. | |
627 | */ | |
e368fb43 JG |
628 | ret = lttcomm_recv_unix_sock(sock, probe_location_payload.buffer.data, |
629 | probe_location_payload.buffer.size); | |
917a718d JG |
630 | if (ret <= 0) { |
631 | DBG("Nothing recv() from client var len data... continuing"); | |
632 | *sock_error = 1; | |
917a718d JG |
633 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
634 | goto error; | |
635 | } | |
636 | ||
637 | /* | |
638 | * Receive the file descriptor to the target binary from the client. | |
639 | */ | |
640 | DBG("Receiving userspace probe target FD from client ..."); | |
641 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
642 | if (ret <= 0) { | |
643 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
644 | *sock_error = 1; | |
645 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
646 | goto error; | |
647 | } | |
648 | ||
fe489250 JG |
649 | handle = fd_handle_create(fd); |
650 | if (!handle) { | |
651 | ret = LTTNG_ERR_NOMEM; | |
652 | goto error; | |
653 | } | |
654 | ||
655 | /* Transferred to the handle. */ | |
656 | fd = -1; | |
657 | ||
658 | ret = lttng_payload_push_fd_handle(&probe_location_payload, handle); | |
e368fb43 JG |
659 | if (ret) { |
660 | ERR("Failed to add userspace probe file descriptor to payload"); | |
661 | ret = LTTNG_ERR_NOMEM; | |
917a718d JG |
662 | goto error; |
663 | } | |
664 | ||
fe489250 JG |
665 | fd_handle_put(handle); |
666 | handle = NULL; | |
667 | ||
e368fb43 JG |
668 | { |
669 | struct lttng_payload_view view = lttng_payload_view_from_payload( | |
670 | &probe_location_payload, 0, -1); | |
917a718d | 671 | |
e368fb43 JG |
672 | /* Extract the probe location from the serialized version. */ |
673 | ret = lttng_userspace_probe_location_create_from_payload( | |
674 | &view, &probe_location); | |
675 | } | |
676 | if (ret < 0) { | |
677 | WARN("Failed to create a userspace probe location from the received buffer"); | |
917a718d JG |
678 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
679 | goto error; | |
680 | } | |
681 | ||
682 | /* Attach the probe location to the event. */ | |
683 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
684 | if (ret) { | |
685 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
686 | goto error; | |
687 | } | |
688 | ||
917a718d | 689 | error: |
fe489250 JG |
690 | if (fd >= 0) { |
691 | if (close(fd)) { | |
692 | PERROR("Failed to close userspace probe location binary fd"); | |
693 | } | |
694 | } | |
695 | ||
696 | fd_handle_put(handle); | |
e368fb43 | 697 | lttng_payload_reset(&probe_location_payload); |
917a718d JG |
698 | return ret; |
699 | } | |
700 | ||
746e08d7 JG |
701 | static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx, |
702 | int sock, | |
703 | int *sock_error, | |
704 | struct lttng_trigger **_trigger) | |
705 | { | |
706 | int ret; | |
707 | size_t trigger_len; | |
708 | ssize_t sock_recv_len; | |
709 | enum lttng_error_code ret_code; | |
710 | struct lttng_payload trigger_payload; | |
b5ef1685 | 711 | struct lttng_trigger *trigger = NULL; |
746e08d7 JG |
712 | |
713 | lttng_payload_init(&trigger_payload); | |
714 | trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length; | |
715 | ret = lttng_dynamic_buffer_set_size( | |
716 | &trigger_payload.buffer, trigger_len); | |
717 | if (ret) { | |
718 | ret_code = LTTNG_ERR_NOMEM; | |
719 | goto end; | |
720 | } | |
721 | ||
722 | sock_recv_len = lttcomm_recv_unix_sock( | |
723 | sock, trigger_payload.buffer.data, trigger_len); | |
724 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
725 | ERR("Failed to receive trigger in command payload"); | |
726 | *sock_error = 1; | |
727 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
728 | goto end; | |
729 | } | |
730 | ||
731 | /* Receive fds, if any. */ | |
732 | if (cmd_ctx->lsm.fd_count > 0) { | |
733 | sock_recv_len = lttcomm_recv_payload_fds_unix_sock( | |
734 | sock, cmd_ctx->lsm.fd_count, &trigger_payload); | |
735 | if (sock_recv_len > 0 && | |
736 | sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
737 | ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d", | |
738 | cmd_ctx->lsm.fd_count, (int) ret); | |
739 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
740 | *sock_error = 1; | |
741 | goto end; | |
742 | } else if (sock_recv_len <= 0) { | |
743 | ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d", | |
744 | cmd_ctx->lsm.fd_count, (int) ret); | |
745 | ret_code = LTTNG_ERR_FATAL; | |
746 | *sock_error = 1; | |
747 | goto end; | |
748 | } | |
749 | } | |
750 | ||
751 | /* Deserialize trigger. */ | |
752 | { | |
753 | struct lttng_payload_view view = | |
754 | lttng_payload_view_from_payload( | |
755 | &trigger_payload, 0, -1); | |
756 | ||
757 | if (lttng_trigger_create_from_payload(&view, &trigger) != | |
758 | trigger_len) { | |
759 | ERR("Invalid trigger received as part of command payload"); | |
760 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
b5ef1685 | 761 | lttng_trigger_put(trigger); |
746e08d7 JG |
762 | goto end; |
763 | } | |
764 | } | |
765 | ||
766 | *_trigger = trigger; | |
767 | ret_code = LTTNG_OK; | |
768 | ||
769 | end: | |
770 | return ret_code; | |
771 | } | |
772 | ||
c3e68e71 JR |
773 | static enum lttng_error_code receive_lttng_map(int sock, |
774 | int *sock_error, | |
775 | uint32_t map_len, | |
776 | struct lttng_map **_map) | |
777 | { | |
778 | int ret; | |
779 | ssize_t sock_recv_len; | |
780 | enum lttng_error_code ret_code; | |
781 | struct lttng_payload map_payload; | |
782 | struct lttng_map *map = NULL; | |
783 | ||
784 | lttng_payload_init(&map_payload); | |
785 | ret = lttng_dynamic_buffer_set_size( | |
786 | &map_payload.buffer, map_len); | |
787 | if (ret) { | |
788 | ret_code = LTTNG_ERR_NOMEM; | |
789 | goto end; | |
790 | } | |
791 | ||
792 | sock_recv_len = lttcomm_recv_unix_sock( | |
793 | sock, map_payload.buffer.data, map_len); | |
794 | if (sock_recv_len < 0 || sock_recv_len != map_len) { | |
795 | ERR("Failed to receive map in command payload"); | |
796 | *sock_error = 1; | |
797 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
798 | goto end; | |
799 | } | |
800 | ||
801 | /* Deserialize map. */ | |
802 | { | |
803 | struct lttng_payload_view view = | |
804 | lttng_payload_view_from_payload( | |
805 | &map_payload, 0, -1); | |
806 | ||
807 | if (lttng_map_create_from_payload(&view, &map) != | |
808 | map_len) { | |
809 | ERR("Invalid map received as part of command payload"); | |
810 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
811 | lttng_map_put(map); | |
812 | goto end; | |
813 | } | |
814 | } | |
815 | ||
816 | *_map = map; | |
817 | ret_code = LTTNG_OK; | |
818 | ||
819 | end: | |
820 | return ret_code; | |
821 | } | |
822 | ||
823 | static enum lttng_error_code receive_lttng_map_query(int sock, | |
824 | int *sock_error, | |
825 | uint32_t map_query_len, | |
826 | struct lttng_map_query **_map_query) | |
827 | { | |
828 | int ret; | |
829 | ssize_t sock_recv_len; | |
830 | enum lttng_error_code ret_code; | |
831 | struct lttng_payload map_query_payload; | |
832 | struct lttng_map_query *map_query = NULL; | |
833 | ||
834 | lttng_payload_init(&map_query_payload); | |
835 | ret = lttng_dynamic_buffer_set_size( | |
836 | &map_query_payload.buffer, map_query_len); | |
837 | if (ret) { | |
838 | ret_code = LTTNG_ERR_NOMEM; | |
839 | goto end; | |
840 | } | |
841 | ||
842 | sock_recv_len = lttcomm_recv_unix_sock( | |
843 | sock, map_query_payload.buffer.data, map_query_len); | |
844 | if (sock_recv_len < 0 || sock_recv_len != map_query_len) { | |
845 | ERR("Failed to receive map query in command payload"); | |
846 | *sock_error = 1; | |
847 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
848 | goto end; | |
849 | } | |
850 | ||
851 | /* Deserialize map query. */ | |
852 | { | |
853 | struct lttng_payload_view view = | |
854 | lttng_payload_view_from_payload( | |
855 | &map_query_payload, 0, -1); | |
856 | ||
857 | if (lttng_map_query_create_from_payload(&view, &map_query) != | |
858 | map_query_len) { | |
859 | ERR("Invalid map query received as part of command payload"); | |
860 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
861 | lttng_map_query_destroy(map_query); | |
862 | goto end; | |
863 | } | |
864 | } | |
865 | ||
866 | *_map_query = map_query; | |
867 | ret_code = LTTNG_OK; | |
868 | ||
869 | end: | |
870 | return ret_code; | |
871 | } | |
872 | ||
917a718d JG |
873 | /* |
874 | * Version of setup_lttng_msg() without command header. | |
875 | */ | |
876 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
877 | void *payload_buf, size_t payload_len) | |
878 | { | |
879 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
880 | } | |
881 | ||
917a718d JG |
882 | /* |
883 | * Check if the current kernel tracer supports the session rotation feature. | |
884 | * Return 1 if it does, 0 otherwise. | |
885 | */ | |
886 | static int check_rotate_compatible(void) | |
887 | { | |
888 | int ret = 1; | |
889 | ||
890 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
891 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
892 | ret = 0; | |
893 | } | |
894 | ||
895 | return ret; | |
896 | } | |
897 | ||
898 | /* | |
899 | * Send data on a unix socket using the liblttsessiondcomm API. | |
900 | * | |
901 | * Return lttcomm error code. | |
902 | */ | |
3a91de3a | 903 | static int send_unix_sock(int sock, struct lttng_payload_view *view) |
917a718d | 904 | { |
3a91de3a | 905 | int ret; |
fe489250 | 906 | const int fd_count = lttng_payload_view_get_fd_handle_count(view); |
3a91de3a | 907 | |
917a718d | 908 | /* Check valid length */ |
3a91de3a JG |
909 | if (view->buffer.size == 0) { |
910 | ret = -1; | |
911 | goto end; | |
912 | } | |
913 | ||
914 | ret = lttcomm_send_unix_sock( | |
915 | sock, view->buffer.data, view->buffer.size); | |
916 | if (ret < 0) { | |
917 | goto end; | |
917a718d JG |
918 | } |
919 | ||
fe489250 | 920 | if (fd_count > 0) { |
700741dc JG |
921 | ret = lttcomm_send_payload_view_fds_unix_sock(sock, view); |
922 | if (ret < 0) { | |
923 | goto end; | |
fe489250 | 924 | } |
3a91de3a JG |
925 | } |
926 | ||
927 | end: | |
928 | return ret; | |
917a718d JG |
929 | } |
930 | ||
931 | /* | |
932 | * Process the command requested by the lttng client within the command | |
933 | * context structure. This function make sure that the return structure (llm) | |
934 | * is set and ready for transmission before returning. | |
935 | * | |
936 | * Return any error encountered or 0 for success. | |
937 | * | |
938 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
939 | * A command may assume the ownership of the socket, in which case its value |
940 | * should be set to -1. | |
917a718d JG |
941 | * |
942 | * Should *NOT* be called with RCU read-side lock held. | |
943 | */ | |
3e3665b8 | 944 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
917a718d JG |
945 | int *sock_error) |
946 | { | |
947 | int ret = LTTNG_OK; | |
9124c630 JR |
948 | bool need_tracing_session = true; |
949 | bool need_domain; | |
950 | bool need_consumerd; | |
917a718d | 951 | |
19f912db FD |
952 | DBG("Processing client command '%s\' (%d)", |
953 | lttcomm_sessiond_command_str(cmd_ctx->lsm.cmd_type), | |
954 | cmd_ctx->lsm.cmd_type); | |
917a718d JG |
955 | |
956 | assert(!rcu_read_ongoing()); | |
957 | ||
958 | *sock_error = 0; | |
959 | ||
3a91de3a | 960 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 961 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
962 | case LTTNG_DESTROY_SESSION: |
963 | case LTTNG_LIST_SESSIONS: | |
964 | case LTTNG_LIST_DOMAINS: | |
965 | case LTTNG_START_TRACE: | |
966 | case LTTNG_STOP_TRACE: | |
967 | case LTTNG_DATA_PENDING: | |
968 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
969 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
970 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
971 | case LTTNG_SNAPSHOT_RECORD: | |
972 | case LTTNG_SAVE_SESSION: | |
973 | case LTTNG_SET_SESSION_SHM_PATH: | |
974 | case LTTNG_REGENERATE_METADATA: | |
975 | case LTTNG_REGENERATE_STATEDUMP: | |
917a718d JG |
976 | case LTTNG_ROTATE_SESSION: |
977 | case LTTNG_ROTATION_GET_INFO: | |
978 | case LTTNG_ROTATION_SET_SCHEDULE: | |
979 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
022349df | 980 | case LTTNG_CLEAR_SESSION: |
fbc9f37d | 981 | case LTTNG_LIST_TRIGGERS: |
c3e68e71 | 982 | case LTTNG_LIST_MAP_VALUES: |
9124c630 JR |
983 | need_domain = false; |
984 | break; | |
985 | default: | |
986 | need_domain = true; | |
987 | } | |
988 | ||
989 | /* Needs a functioning consumerd? */ | |
990 | switch (cmd_ctx->lsm.cmd_type) { | |
991 | case LTTNG_REGISTER_TRIGGER: | |
992 | case LTTNG_UNREGISTER_TRIGGER: | |
c3e68e71 JR |
993 | case LTTNG_ADD_MAP: |
994 | case LTTNG_ENABLE_MAP: | |
995 | case LTTNG_DISABLE_MAP: | |
996 | case LTTNG_LIST_MAP_VALUES: | |
9124c630 | 997 | need_consumerd = false; |
917a718d JG |
998 | break; |
999 | default: | |
9124c630 JR |
1000 | need_consumerd = true; |
1001 | break; | |
917a718d JG |
1002 | } |
1003 | ||
1004 | if (config.no_kernel && need_domain | |
3a91de3a | 1005 | && cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) { |
917a718d JG |
1006 | if (!is_root) { |
1007 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
1008 | } else { | |
1009 | ret = LTTNG_ERR_KERN_NA; | |
1010 | } | |
1011 | goto error; | |
1012 | } | |
1013 | ||
1014 | /* Deny register consumer if we already have a spawned consumer. */ | |
3a91de3a | 1015 | if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1016 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
1017 | if (kconsumer_data.pid > 0) { | |
1018 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1019 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
1020 | goto error; | |
1021 | } | |
1022 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * Check for command that don't needs to allocate a returned payload. We do | |
1027 | * this here so we don't have to make the call for no payload at each | |
1028 | * command. | |
1029 | */ | |
3a91de3a | 1030 | switch(cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1031 | case LTTNG_LIST_SESSIONS: |
1032 | case LTTNG_LIST_TRACEPOINTS: | |
1033 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1034 | case LTTNG_LIST_DOMAINS: | |
1035 | case LTTNG_LIST_CHANNELS: | |
1036 | case LTTNG_LIST_EVENTS: | |
1037 | case LTTNG_LIST_SYSCALLS: | |
159b042f JG |
1038 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
1039 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
1040 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
917a718d JG |
1041 | case LTTNG_DATA_PENDING: |
1042 | case LTTNG_ROTATE_SESSION: | |
1043 | case LTTNG_ROTATION_GET_INFO: | |
9124c630 | 1044 | case LTTNG_REGISTER_TRIGGER: |
fbc9f37d | 1045 | case LTTNG_LIST_TRIGGERS: |
917a718d JG |
1046 | break; |
1047 | default: | |
1048 | /* Setup lttng message with no payload */ | |
1049 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
1050 | if (ret < 0) { | |
1051 | /* This label does not try to unlock the session */ | |
1052 | goto init_setup_error; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | /* Commands that DO NOT need a session. */ | |
3a91de3a | 1057 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 1058 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
1059 | case LTTNG_LIST_SESSIONS: |
1060 | case LTTNG_LIST_TRACEPOINTS: | |
1061 | case LTTNG_LIST_SYSCALLS: | |
1062 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1063 | case LTTNG_SAVE_SESSION: | |
1064 | case LTTNG_REGISTER_TRIGGER: | |
1065 | case LTTNG_UNREGISTER_TRIGGER: | |
fbc9f37d | 1066 | case LTTNG_LIST_TRIGGERS: |
9124c630 | 1067 | need_tracing_session = false; |
917a718d JG |
1068 | break; |
1069 | default: | |
3a91de3a | 1070 | DBG("Getting session %s by name", cmd_ctx->lsm.session.name); |
917a718d JG |
1071 | /* |
1072 | * We keep the session list lock across _all_ commands | |
1073 | * for now, because the per-session lock does not | |
1074 | * handle teardown properly. | |
1075 | */ | |
1076 | session_lock_list(); | |
3a91de3a | 1077 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name); |
917a718d JG |
1078 | if (cmd_ctx->session == NULL) { |
1079 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
1080 | goto error; | |
1081 | } else { | |
1082 | /* Acquire lock for the session */ | |
1083 | session_lock(cmd_ctx->session); | |
1084 | } | |
1085 | break; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Commands that need a valid session but should NOT create one if none | |
1090 | * exists. Instead of creating one and destroying it when the command is | |
1091 | * handled, process that right before so we save some round trip in useless | |
1092 | * code path. | |
1093 | */ | |
3a91de3a | 1094 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1095 | case LTTNG_DISABLE_CHANNEL: |
1096 | case LTTNG_DISABLE_EVENT: | |
c3e68e71 | 1097 | case LTTNG_DISABLE_MAP: |
3a91de3a | 1098 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1099 | case LTTNG_DOMAIN_KERNEL: |
1100 | if (!cmd_ctx->session->kernel_session) { | |
1101 | ret = LTTNG_ERR_NO_CHANNEL; | |
1102 | goto error; | |
1103 | } | |
1104 | break; | |
1105 | case LTTNG_DOMAIN_JUL: | |
1106 | case LTTNG_DOMAIN_LOG4J: | |
1107 | case LTTNG_DOMAIN_PYTHON: | |
1108 | case LTTNG_DOMAIN_UST: | |
1109 | if (!cmd_ctx->session->ust_session) { | |
1110 | ret = LTTNG_ERR_NO_CHANNEL; | |
1111 | goto error; | |
1112 | } | |
1113 | break; | |
1114 | default: | |
1115 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1116 | goto error; | |
1117 | } | |
1118 | default: | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | if (!need_domain) { | |
1123 | goto skip_domain; | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Check domain type for specific "pre-action". | |
1128 | */ | |
3a91de3a | 1129 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1130 | case LTTNG_DOMAIN_KERNEL: |
1131 | if (!is_root) { | |
1132 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
1133 | goto error; | |
1134 | } | |
1135 | ||
7d268848 MD |
1136 | /* Kernel tracer check */ |
1137 | if (!kernel_tracer_is_initialized()) { | |
1138 | /* Basically, load kernel tracer modules */ | |
1139 | ret = init_kernel_tracer(); | |
1140 | if (ret != 0) { | |
1141 | goto error; | |
1142 | } | |
1143 | } | |
1144 | ||
917a718d | 1145 | /* Consumer is in an ERROR state. Report back to client */ |
9124c630 JR |
1146 | if (need_consumerd && uatomic_read(&kernel_consumerd_state) == |
1147 | CONSUMER_ERROR) { | |
917a718d JG |
1148 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
1149 | goto error; | |
1150 | } | |
1151 | ||
1152 | /* Need a session for kernel command */ | |
1153 | if (need_tracing_session) { | |
1154 | if (cmd_ctx->session->kernel_session == NULL) { | |
1155 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 1156 | if (ret != LTTNG_OK) { |
917a718d JG |
1157 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
1158 | goto error; | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | /* Start the kernel consumer daemon */ | |
1163 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
1164 | if (kconsumer_data.pid == 0 && | |
3a91de3a | 1165 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1166 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
1167 | ret = start_consumerd(&kconsumer_data); | |
1168 | if (ret < 0) { | |
1169 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1170 | goto error; | |
1171 | } | |
1172 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); | |
1173 | } else { | |
1174 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * The consumer was just spawned so we need to add the socket to | |
1179 | * the consumer output of the session if exist. | |
1180 | */ | |
1181 | ret = consumer_create_socket(&kconsumer_data, | |
1182 | cmd_ctx->session->kernel_session->consumer); | |
1183 | if (ret < 0) { | |
1184 | goto error; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | break; | |
1189 | case LTTNG_DOMAIN_JUL: | |
1190 | case LTTNG_DOMAIN_LOG4J: | |
1191 | case LTTNG_DOMAIN_PYTHON: | |
44760c20 JR |
1192 | if (!agent_tracing_is_enabled()) { |
1193 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1194 | goto error; | |
1195 | } | |
1196 | /* Fallthrough */ | |
917a718d JG |
1197 | case LTTNG_DOMAIN_UST: |
1198 | { | |
1199 | if (!ust_app_supported()) { | |
1200 | ret = LTTNG_ERR_NO_UST; | |
1201 | goto error; | |
1202 | } | |
9124c630 | 1203 | |
917a718d | 1204 | /* Consumer is in an ERROR state. Report back to client */ |
9124c630 JR |
1205 | if (need_consumerd && uatomic_read(&ust_consumerd_state) == |
1206 | CONSUMER_ERROR) { | |
917a718d JG |
1207 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
1208 | goto error; | |
1209 | } | |
1210 | ||
1211 | if (need_tracing_session) { | |
1212 | /* Create UST session if none exist. */ | |
1213 | if (cmd_ctx->session->ust_session == NULL) { | |
1214 | ret = create_ust_session(cmd_ctx->session, | |
3a91de3a | 1215 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain)); |
917a718d JG |
1216 | if (ret != LTTNG_OK) { |
1217 | goto error; | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | /* Start the UST consumer daemons */ | |
1222 | /* 64-bit */ | |
1223 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
1224 | if (config.consumerd64_bin_path.value && | |
1225 | ustconsumer64_data.pid == 0 && | |
3a91de3a | 1226 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1227 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
1228 | ret = start_consumerd(&ustconsumer64_data); | |
1229 | if (ret < 0) { | |
1230 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
1231 | uatomic_set(&ust_consumerd64_fd, -EINVAL); | |
1232 | goto error; | |
1233 | } | |
1234 | ||
1235 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); | |
1236 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1237 | } else { | |
1238 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Setup socket for consumer 64 bit. No need for atomic access | |
1243 | * since it was set above and can ONLY be set in this thread. | |
1244 | */ | |
1245 | ret = consumer_create_socket(&ustconsumer64_data, | |
1246 | cmd_ctx->session->ust_session->consumer); | |
1247 | if (ret < 0) { | |
1248 | goto error; | |
1249 | } | |
1250 | ||
1251 | /* 32-bit */ | |
1252 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); | |
1253 | if (config.consumerd32_bin_path.value && | |
1254 | ustconsumer32_data.pid == 0 && | |
3a91de3a | 1255 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1256 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
1257 | ret = start_consumerd(&ustconsumer32_data); | |
1258 | if (ret < 0) { | |
1259 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
1260 | uatomic_set(&ust_consumerd32_fd, -EINVAL); | |
1261 | goto error; | |
1262 | } | |
1263 | ||
1264 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); | |
1265 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1266 | } else { | |
1267 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Setup socket for consumer 32 bit. No need for atomic access | |
1272 | * since it was set above and can ONLY be set in this thread. | |
1273 | */ | |
1274 | ret = consumer_create_socket(&ustconsumer32_data, | |
1275 | cmd_ctx->session->ust_session->consumer); | |
1276 | if (ret < 0) { | |
1277 | goto error; | |
1278 | } | |
1279 | } | |
1280 | break; | |
1281 | } | |
1282 | default: | |
1283 | break; | |
1284 | } | |
1285 | skip_domain: | |
1286 | ||
1287 | /* Validate consumer daemon state when start/stop trace command */ | |
3a91de3a JG |
1288 | if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE || |
1289 | cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) { | |
1290 | switch (cmd_ctx->lsm.domain.type) { | |
917a718d JG |
1291 | case LTTNG_DOMAIN_NONE: |
1292 | break; | |
1293 | case LTTNG_DOMAIN_JUL: | |
1294 | case LTTNG_DOMAIN_LOG4J: | |
1295 | case LTTNG_DOMAIN_PYTHON: | |
1296 | case LTTNG_DOMAIN_UST: | |
1297 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
1298 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1299 | goto error; | |
1300 | } | |
1301 | break; | |
1302 | case LTTNG_DOMAIN_KERNEL: | |
1303 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
1304 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
1305 | goto error; | |
1306 | } | |
1307 | break; | |
1308 | default: | |
1309 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1310 | goto error; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | /* | |
d7b377ed | 1315 | * Check that the UID matches that of the tracing session. |
917a718d JG |
1316 | * The root user can interact with all sessions. |
1317 | */ | |
1318 | if (need_tracing_session) { | |
1319 | if (!session_access_ok(cmd_ctx->session, | |
d7b377ed | 1320 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) || |
917a718d JG |
1321 | cmd_ctx->session->destroyed) { |
1322 | ret = LTTNG_ERR_EPERM; | |
1323 | goto error; | |
1324 | } | |
1325 | } | |
1326 | ||
1327 | /* | |
1328 | * Send relayd information to consumer as soon as we have a domain and a | |
1329 | * session defined. | |
1330 | */ | |
1331 | if (cmd_ctx->session && need_domain) { | |
1332 | /* | |
1333 | * Setup relayd if not done yet. If the relayd information was already | |
1334 | * sent to the consumer, this call will gracefully return. | |
1335 | */ | |
1336 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1337 | if (ret != LTTNG_OK) { | |
1338 | goto error; | |
1339 | } | |
1340 | } | |
1341 | ||
1342 | /* Process by command type */ | |
3a91de3a | 1343 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1344 | case LTTNG_ADD_CONTEXT: |
1345 | { | |
1346 | /* | |
1347 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1348 | * payload if the context being added is an application context. | |
1349 | */ | |
3a91de3a | 1350 | if (cmd_ctx->lsm.u.context.ctx.ctx == |
917a718d JG |
1351 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1352 | char *provider_name = NULL, *context_name = NULL; | |
1353 | size_t provider_name_len = | |
3a91de3a | 1354 | cmd_ctx->lsm.u.context.provider_name_len; |
917a718d | 1355 | size_t context_name_len = |
3a91de3a | 1356 | cmd_ctx->lsm.u.context.context_name_len; |
917a718d JG |
1357 | |
1358 | if (provider_name_len == 0 || context_name_len == 0) { | |
1359 | /* | |
1360 | * Application provider and context names MUST | |
1361 | * be provided. | |
1362 | */ | |
1363 | ret = -LTTNG_ERR_INVALID; | |
1364 | goto error; | |
1365 | } | |
1366 | ||
1367 | provider_name = zmalloc(provider_name_len + 1); | |
1368 | if (!provider_name) { | |
1369 | ret = -LTTNG_ERR_NOMEM; | |
1370 | goto error; | |
1371 | } | |
3a91de3a | 1372 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = |
917a718d JG |
1373 | provider_name; |
1374 | ||
1375 | context_name = zmalloc(context_name_len + 1); | |
1376 | if (!context_name) { | |
1377 | ret = -LTTNG_ERR_NOMEM; | |
1378 | goto error_add_context; | |
1379 | } | |
3a91de3a | 1380 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = |
917a718d JG |
1381 | context_name; |
1382 | ||
3e3665b8 | 1383 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
917a718d JG |
1384 | provider_name_len); |
1385 | if (ret < 0) { | |
1386 | goto error_add_context; | |
1387 | } | |
1388 | ||
3e3665b8 | 1389 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
917a718d JG |
1390 | context_name_len); |
1391 | if (ret < 0) { | |
1392 | goto error_add_context; | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * cmd_add_context assumes ownership of the provider and context | |
1398 | * names. | |
1399 | */ | |
1400 | ret = cmd_add_context(cmd_ctx->session, | |
3a91de3a JG |
1401 | cmd_ctx->lsm.domain.type, |
1402 | cmd_ctx->lsm.u.context.channel_name, | |
1403 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.context.ctx), | |
917a718d JG |
1404 | kernel_poll_pipe[1]); |
1405 | ||
3a91de3a JG |
1406 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = NULL; |
1407 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = NULL; | |
917a718d | 1408 | error_add_context: |
3a91de3a JG |
1409 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name); |
1410 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name); | |
917a718d JG |
1411 | if (ret < 0) { |
1412 | goto error; | |
1413 | } | |
1414 | break; | |
1415 | } | |
1416 | case LTTNG_DISABLE_CHANNEL: | |
1417 | { | |
3a91de3a JG |
1418 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1419 | cmd_ctx->lsm.u.disable.channel_name); | |
917a718d JG |
1420 | break; |
1421 | } | |
1422 | case LTTNG_DISABLE_EVENT: | |
1423 | { | |
1424 | ||
1425 | /* | |
1426 | * FIXME: handle filter; for now we just receive the filter's | |
1427 | * bytecode along with the filter expression which are sent by | |
1428 | * liblttng-ctl and discard them. | |
1429 | * | |
1430 | * This fixes an issue where the client may block while sending | |
1431 | * the filter payload and encounter an error because the session | |
1432 | * daemon closes the socket without ever handling this data. | |
1433 | */ | |
3a91de3a JG |
1434 | size_t count = cmd_ctx->lsm.u.disable.expression_len + |
1435 | cmd_ctx->lsm.u.disable.bytecode_len; | |
917a718d JG |
1436 | |
1437 | if (count) { | |
1438 | char data[LTTNG_FILTER_MAX_LEN]; | |
1439 | ||
1440 | DBG("Discarding disable event command payload of size %zu", count); | |
1441 | while (count) { | |
3e3665b8 | 1442 | ret = lttcomm_recv_unix_sock(*sock, data, |
917a718d JG |
1443 | count > sizeof(data) ? sizeof(data) : count); |
1444 | if (ret < 0) { | |
1445 | goto error; | |
1446 | } | |
1447 | ||
1448 | count -= (size_t) ret; | |
1449 | } | |
1450 | } | |
3a91de3a JG |
1451 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1452 | cmd_ctx->lsm.u.disable.channel_name, | |
1453 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.disable.event)); | |
917a718d JG |
1454 | break; |
1455 | } | |
1456 | case LTTNG_ENABLE_CHANNEL: | |
1457 | { | |
3a91de3a JG |
1458 | cmd_ctx->lsm.u.channel.chan.attr.extended.ptr = |
1459 | (struct lttng_channel_extended *) &cmd_ctx->lsm.u.channel.extended; | |
df4f5a87 | 1460 | ret = cmd_enable_channel(cmd_ctx->session, |
3a91de3a JG |
1461 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1462 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.channel.chan), | |
917a718d JG |
1463 | kernel_poll_pipe[1]); |
1464 | break; | |
1465 | } | |
c3e68e71 JR |
1466 | case LTTNG_ADD_MAP: |
1467 | { | |
1468 | ret = cmd_add_map(cmd_ctx, *sock); | |
1469 | ||
1470 | break; | |
1471 | } | |
1472 | case LTTNG_ENABLE_MAP: | |
1473 | ret = cmd_enable_map(cmd_ctx->session, cmd_ctx->lsm.domain.type, | |
1474 | cmd_ctx->lsm.u.enable_map.map_name); | |
1475 | break; | |
1476 | case LTTNG_DISABLE_MAP: | |
1477 | { | |
1478 | ret = cmd_disable_map(cmd_ctx->session, cmd_ctx->lsm.domain.type, | |
1479 | cmd_ctx->lsm.u.disable_map.map_name); | |
1480 | ||
1481 | break; | |
1482 | } | |
159b042f JG |
1483 | case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE: |
1484 | case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE: | |
917a718d | 1485 | { |
159b042f JG |
1486 | struct lttng_dynamic_buffer payload; |
1487 | struct lttng_buffer_view payload_view; | |
1488 | const bool add_value = | |
3a91de3a | 1489 | cmd_ctx->lsm.cmd_type == |
159b042f JG |
1490 | LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE; |
1491 | const size_t name_len = | |
3a91de3a | 1492 | cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1493 | .name_len; |
1494 | const enum lttng_domain_type domain_type = | |
1495 | (enum lttng_domain_type) | |
3a91de3a | 1496 | cmd_ctx->lsm.domain.type; |
159b042f | 1497 | const enum lttng_process_attr process_attr = |
3a91de3a | 1498 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1499 | .process_attr_tracker_add_remove_include_value |
1500 | .process_attr; | |
1501 | const enum lttng_process_attr_value_type value_type = | |
1502 | (enum lttng_process_attr_value_type) cmd_ctx | |
3a91de3a | 1503 | ->lsm.u |
159b042f JG |
1504 | .process_attr_tracker_add_remove_include_value |
1505 | .value_type; | |
1506 | struct process_attr_value *value; | |
1507 | enum lttng_error_code ret_code; | |
1434fd36 MJ |
1508 | long login_name_max; |
1509 | ||
1510 | login_name_max = sysconf(_SC_LOGIN_NAME_MAX); | |
1511 | if (login_name_max < 0) { | |
1512 | PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration"); | |
1513 | ret = LTTNG_ERR_INVALID; | |
1514 | goto error; | |
1515 | } | |
159b042f JG |
1516 | |
1517 | /* Receive remaining variable length payload if applicable. */ | |
1434fd36 | 1518 | if (name_len > login_name_max) { |
159b042f JG |
1519 | /* |
1520 | * POSIX mandates user and group names that are at least | |
1521 | * 8 characters long. Note that although shadow-utils | |
1522 | * (useradd, groupaadd, etc.) use 32 chars as their | |
1523 | * limit (from bits/utmp.h, UT_NAMESIZE), | |
1524 | * LOGIN_NAME_MAX is defined to 256. | |
1525 | */ | |
1434fd36 | 1526 | ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld", |
159b042f | 1527 | add_value ? "addition" : "removal", |
1434fd36 | 1528 | name_len, login_name_max); |
159b042f | 1529 | ret = LTTNG_ERR_INVALID; |
2d97a006 JR |
1530 | goto error; |
1531 | } | |
1532 | ||
159b042f JG |
1533 | lttng_dynamic_buffer_init(&payload); |
1534 | if (name_len != 0) { | |
1535 | /* | |
1536 | * Receive variable payload for user/group name | |
1537 | * arguments. | |
1538 | */ | |
1539 | ret = lttng_dynamic_buffer_set_size(&payload, name_len); | |
1540 | if (ret) { | |
1541 | ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument", | |
1542 | add_value ? "add" : "remove"); | |
55c9e7ca | 1543 | ret = LTTNG_ERR_NOMEM; |
159b042f | 1544 | goto error_add_remove_tracker_value; |
55c9e7ca | 1545 | } |
159b042f JG |
1546 | |
1547 | ret = lttcomm_recv_unix_sock( | |
1548 | *sock, payload.data, name_len); | |
55c9e7ca | 1549 | if (ret <= 0) { |
159b042f JG |
1550 | ERR("Failed to receive payload of %s process attribute tracker value argument", |
1551 | add_value ? "add" : "remove"); | |
55c9e7ca | 1552 | *sock_error = 1; |
159b042f JG |
1553 | ret = LTTNG_ERR_INVALID_PROTOCOL; |
1554 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1555 | } |
159b042f | 1556 | } |
2d97a006 | 1557 | |
159b042f JG |
1558 | payload_view = lttng_buffer_view_from_dynamic_buffer( |
1559 | &payload, 0, name_len); | |
3e6e0df2 JG |
1560 | if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) { |
1561 | ret = LTTNG_ERR_INVALID_PROTOCOL; | |
1562 | goto error_add_remove_tracker_value; | |
1563 | } | |
1564 | ||
159b042f JG |
1565 | /* |
1566 | * Validate the value type and domains are legal for the process | |
1567 | * attribute tracker that is specified and convert the value to | |
1568 | * add/remove to the internal sessiond representation. | |
1569 | */ | |
1570 | ret_code = process_attr_value_from_comm(domain_type, | |
1571 | process_attr, value_type, | |
3a91de3a | 1572 | &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1573 | .integral_value, |
1574 | &payload_view, &value); | |
1575 | if (ret_code != LTTNG_OK) { | |
1576 | ret = ret_code; | |
1577 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1578 | } |
159b042f JG |
1579 | |
1580 | if (add_value) { | |
1581 | ret = cmd_process_attr_tracker_inclusion_set_add_value( | |
1582 | cmd_ctx->session, domain_type, | |
1583 | process_attr, value); | |
1584 | } else { | |
1585 | ret = cmd_process_attr_tracker_inclusion_set_remove_value( | |
1586 | cmd_ctx->session, domain_type, | |
1587 | process_attr, value); | |
1588 | } | |
1589 | process_attr_value_destroy(value); | |
1590 | error_add_remove_tracker_value: | |
1591 | lttng_dynamic_buffer_reset(&payload); | |
1592 | break; | |
1593 | } | |
1594 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
1595 | { | |
1596 | enum lttng_tracking_policy tracking_policy; | |
1597 | const enum lttng_domain_type domain_type = | |
1598 | (enum lttng_domain_type) | |
3a91de3a | 1599 | cmd_ctx->lsm.domain.type; |
159b042f | 1600 | const enum lttng_process_attr process_attr = |
3a91de3a | 1601 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1602 | .process_attr_tracker_get_tracking_policy |
1603 | .process_attr; | |
1604 | ||
1605 | ret = cmd_process_attr_tracker_get_tracking_policy( | |
1606 | cmd_ctx->session, domain_type, process_attr, | |
1607 | &tracking_policy); | |
1608 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1609 | goto error; |
1610 | } | |
2d97a006 | 1611 | |
159b042f JG |
1612 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, |
1613 | &(uint32_t){tracking_policy}, sizeof(uint32_t)); | |
1614 | if (ret < 0) { | |
1615 | ret = LTTNG_ERR_NOMEM; | |
2d97a006 JR |
1616 | goto error; |
1617 | } | |
159b042f | 1618 | ret = LTTNG_OK; |
917a718d JG |
1619 | break; |
1620 | } | |
159b042f | 1621 | case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY: |
917a718d | 1622 | { |
159b042f | 1623 | const enum lttng_tracking_policy tracking_policy = |
3a91de3a | 1624 | (enum lttng_tracking_policy) cmd_ctx->lsm.u |
159b042f JG |
1625 | .process_attr_tracker_set_tracking_policy |
1626 | .tracking_policy; | |
1627 | const enum lttng_domain_type domain_type = | |
1628 | (enum lttng_domain_type) | |
3a91de3a | 1629 | cmd_ctx->lsm.domain.type; |
159b042f | 1630 | const enum lttng_process_attr process_attr = |
3a91de3a | 1631 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1632 | .process_attr_tracker_set_tracking_policy |
1633 | .process_attr; | |
1634 | ||
1635 | ret = cmd_process_attr_tracker_set_tracking_policy( | |
1636 | cmd_ctx->session, domain_type, process_attr, | |
1637 | tracking_policy); | |
1638 | if (ret != LTTNG_OK) { | |
1639 | goto error; | |
55c9e7ca | 1640 | } |
159b042f JG |
1641 | break; |
1642 | } | |
1643 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
1644 | { | |
1645 | struct lttng_process_attr_values *values; | |
1646 | struct lttng_dynamic_buffer reply; | |
1647 | const enum lttng_domain_type domain_type = | |
1648 | (enum lttng_domain_type) | |
3a91de3a | 1649 | cmd_ctx->lsm.domain.type; |
159b042f | 1650 | const enum lttng_process_attr process_attr = |
3a91de3a | 1651 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1652 | .process_attr_tracker_get_inclusion_set |
1653 | .process_attr; | |
1654 | ||
1655 | ret = cmd_process_attr_tracker_get_inclusion_set( | |
1656 | cmd_ctx->session, domain_type, process_attr, | |
1657 | &values); | |
1658 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1659 | goto error; |
1660 | } | |
2d97a006 | 1661 | |
159b042f JG |
1662 | lttng_dynamic_buffer_init(&reply); |
1663 | ret = lttng_process_attr_values_serialize(values, &reply); | |
1664 | if (ret < 0) { | |
1665 | goto error_tracker_get_inclusion_set; | |
2d97a006 JR |
1666 | } |
1667 | ||
159b042f JG |
1668 | ret = setup_lttng_msg_no_cmd_header( |
1669 | cmd_ctx, reply.data, reply.size); | |
1670 | if (ret < 0) { | |
1671 | ret = LTTNG_ERR_NOMEM; | |
1672 | goto error_tracker_get_inclusion_set; | |
1673 | } | |
1674 | ret = LTTNG_OK; | |
1675 | ||
1676 | error_tracker_get_inclusion_set: | |
1677 | lttng_process_attr_values_destroy(values); | |
1678 | lttng_dynamic_buffer_reset(&reply); | |
917a718d JG |
1679 | break; |
1680 | } | |
1681 | case LTTNG_ENABLE_EVENT: | |
1682 | { | |
1683 | struct lttng_event *ev = NULL; | |
1684 | struct lttng_event_exclusion *exclusion = NULL; | |
2b00d462 | 1685 | struct lttng_bytecode *bytecode = NULL; |
917a718d JG |
1686 | char *filter_expression = NULL; |
1687 | ||
1688 | /* Handle exclusion events and receive it from the client. */ | |
3a91de3a JG |
1689 | if (cmd_ctx->lsm.u.enable.exclusion_count > 0) { |
1690 | size_t count = cmd_ctx->lsm.u.enable.exclusion_count; | |
917a718d JG |
1691 | |
1692 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1693 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1694 | if (!exclusion) { | |
1695 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1696 | goto error; | |
1697 | } | |
1698 | ||
1699 | DBG("Receiving var len exclusion event list from client ..."); | |
1700 | exclusion->count = count; | |
3e3665b8 | 1701 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
917a718d JG |
1702 | count * LTTNG_SYMBOL_NAME_LEN); |
1703 | if (ret <= 0) { | |
1704 | DBG("Nothing recv() from client var len data... continuing"); | |
1705 | *sock_error = 1; | |
1706 | free(exclusion); | |
1707 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1708 | goto error; | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | /* Get filter expression from client. */ | |
3a91de3a | 1713 | if (cmd_ctx->lsm.u.enable.expression_len > 0) { |
917a718d | 1714 | size_t expression_len = |
3a91de3a | 1715 | cmd_ctx->lsm.u.enable.expression_len; |
917a718d JG |
1716 | |
1717 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1718 | ret = LTTNG_ERR_FILTER_INVAL; | |
1719 | free(exclusion); | |
1720 | goto error; | |
1721 | } | |
1722 | ||
1723 | filter_expression = zmalloc(expression_len); | |
1724 | if (!filter_expression) { | |
1725 | free(exclusion); | |
1726 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1727 | goto error; | |
1728 | } | |
1729 | ||
1730 | /* Receive var. len. data */ | |
1731 | DBG("Receiving var len filter's expression from client ..."); | |
3e3665b8 | 1732 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
917a718d JG |
1733 | expression_len); |
1734 | if (ret <= 0) { | |
1735 | DBG("Nothing recv() from client var len data... continuing"); | |
1736 | *sock_error = 1; | |
1737 | free(filter_expression); | |
1738 | free(exclusion); | |
1739 | ret = LTTNG_ERR_FILTER_INVAL; | |
1740 | goto error; | |
1741 | } | |
1742 | } | |
1743 | ||
1744 | /* Handle filter and get bytecode from client. */ | |
3a91de3a JG |
1745 | if (cmd_ctx->lsm.u.enable.bytecode_len > 0) { |
1746 | size_t bytecode_len = cmd_ctx->lsm.u.enable.bytecode_len; | |
917a718d JG |
1747 | |
1748 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1749 | ret = LTTNG_ERR_FILTER_INVAL; | |
1750 | free(filter_expression); | |
1751 | free(exclusion); | |
1752 | goto error; | |
1753 | } | |
1754 | ||
1755 | bytecode = zmalloc(bytecode_len); | |
1756 | if (!bytecode) { | |
1757 | free(filter_expression); | |
1758 | free(exclusion); | |
1759 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1760 | goto error; | |
1761 | } | |
1762 | ||
1763 | /* Receive var. len. data */ | |
1764 | DBG("Receiving var len filter's bytecode from client ..."); | |
3e3665b8 | 1765 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
917a718d JG |
1766 | if (ret <= 0) { |
1767 | DBG("Nothing recv() from client var len data... continuing"); | |
1768 | *sock_error = 1; | |
1769 | free(filter_expression); | |
1770 | free(bytecode); | |
1771 | free(exclusion); | |
1772 | ret = LTTNG_ERR_FILTER_INVAL; | |
1773 | goto error; | |
1774 | } | |
1775 | ||
1776 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1777 | free(filter_expression); | |
1778 | free(bytecode); | |
1779 | free(exclusion); | |
1780 | ret = LTTNG_ERR_FILTER_INVAL; | |
1781 | goto error; | |
1782 | } | |
1783 | } | |
1784 | ||
3a91de3a | 1785 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm.u.enable.event)); |
917a718d JG |
1786 | if (!ev) { |
1787 | DBG("Failed to copy event: %s", | |
3a91de3a | 1788 | cmd_ctx->lsm.u.enable.event.name); |
917a718d JG |
1789 | free(filter_expression); |
1790 | free(bytecode); | |
1791 | free(exclusion); | |
1792 | ret = LTTNG_ERR_NOMEM; | |
1793 | goto error; | |
1794 | } | |
1795 | ||
1796 | ||
3a91de3a | 1797 | if (cmd_ctx->lsm.u.enable.userspace_probe_location_len > 0) { |
917a718d | 1798 | /* Expect a userspace probe description. */ |
3e3665b8 | 1799 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
917a718d JG |
1800 | if (ret) { |
1801 | free(filter_expression); | |
1802 | free(bytecode); | |
1803 | free(exclusion); | |
1804 | lttng_event_destroy(ev); | |
1805 | goto error; | |
1806 | } | |
1807 | } | |
1808 | ||
df4f5a87 | 1809 | ret = cmd_enable_event(cmd_ctx->session, |
3a91de3a JG |
1810 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1811 | cmd_ctx->lsm.u.enable.channel_name, | |
917a718d JG |
1812 | ev, |
1813 | filter_expression, bytecode, exclusion, | |
1814 | kernel_poll_pipe[1]); | |
1815 | lttng_event_destroy(ev); | |
1816 | break; | |
1817 | } | |
1818 | case LTTNG_LIST_TRACEPOINTS: | |
1819 | { | |
1820 | struct lttng_event *events; | |
1821 | ssize_t nb_events; | |
1822 | ||
1823 | session_lock_list(); | |
3a91de3a | 1824 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm.domain.type, &events); |
917a718d JG |
1825 | session_unlock_list(); |
1826 | if (nb_events < 0) { | |
1827 | /* Return value is a negative lttng_error_code. */ | |
1828 | ret = -nb_events; | |
1829 | goto error; | |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * Setup lttng message with payload size set to the event list size in | |
1834 | * bytes and then copy list into the llm payload. | |
1835 | */ | |
1836 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1837 | sizeof(struct lttng_event) * nb_events); | |
1838 | free(events); | |
1839 | ||
1840 | if (ret < 0) { | |
1841 | goto setup_error; | |
1842 | } | |
1843 | ||
1844 | ret = LTTNG_OK; | |
1845 | break; | |
1846 | } | |
1847 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1848 | { | |
1849 | struct lttng_event_field *fields; | |
1850 | ssize_t nb_fields; | |
1851 | ||
1852 | session_lock_list(); | |
3a91de3a | 1853 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm.domain.type, |
917a718d JG |
1854 | &fields); |
1855 | session_unlock_list(); | |
1856 | if (nb_fields < 0) { | |
1857 | /* Return value is a negative lttng_error_code. */ | |
1858 | ret = -nb_fields; | |
1859 | goto error; | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * Setup lttng message with payload size set to the event list size in | |
1864 | * bytes and then copy list into the llm payload. | |
1865 | */ | |
1866 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1867 | sizeof(struct lttng_event_field) * nb_fields); | |
1868 | free(fields); | |
1869 | ||
1870 | if (ret < 0) { | |
1871 | goto setup_error; | |
1872 | } | |
1873 | ||
1874 | ret = LTTNG_OK; | |
1875 | break; | |
1876 | } | |
1877 | case LTTNG_LIST_SYSCALLS: | |
1878 | { | |
1879 | struct lttng_event *events; | |
1880 | ssize_t nb_events; | |
1881 | ||
1882 | nb_events = cmd_list_syscalls(&events); | |
1883 | if (nb_events < 0) { | |
1884 | /* Return value is a negative lttng_error_code. */ | |
1885 | ret = -nb_events; | |
1886 | goto error; | |
1887 | } | |
1888 | ||
1889 | /* | |
1890 | * Setup lttng message with payload size set to the event list size in | |
1891 | * bytes and then copy list into the llm payload. | |
1892 | */ | |
1893 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1894 | sizeof(struct lttng_event) * nb_events); | |
1895 | free(events); | |
1896 | ||
1897 | if (ret < 0) { | |
1898 | goto setup_error; | |
1899 | } | |
1900 | ||
1901 | ret = LTTNG_OK; | |
1902 | break; | |
1903 | } | |
917a718d JG |
1904 | case LTTNG_SET_CONSUMER_URI: |
1905 | { | |
1906 | size_t nb_uri, len; | |
1907 | struct lttng_uri *uris; | |
1908 | ||
3a91de3a | 1909 | nb_uri = cmd_ctx->lsm.u.uri.size; |
917a718d JG |
1910 | len = nb_uri * sizeof(struct lttng_uri); |
1911 | ||
1912 | if (nb_uri == 0) { | |
1913 | ret = LTTNG_ERR_INVALID; | |
1914 | goto error; | |
1915 | } | |
1916 | ||
1917 | uris = zmalloc(len); | |
1918 | if (uris == NULL) { | |
1919 | ret = LTTNG_ERR_FATAL; | |
1920 | goto error; | |
1921 | } | |
1922 | ||
1923 | /* Receive variable len data */ | |
1924 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1925 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1926 | if (ret <= 0) { |
1927 | DBG("No URIs received from client... continuing"); | |
1928 | *sock_error = 1; | |
1929 | ret = LTTNG_ERR_SESSION_FAIL; | |
1930 | free(uris); | |
1931 | goto error; | |
1932 | } | |
1933 | ||
1934 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1935 | free(uris); | |
1936 | if (ret != LTTNG_OK) { | |
1937 | goto error; | |
1938 | } | |
1939 | ||
1940 | ||
1941 | break; | |
1942 | } | |
1943 | case LTTNG_START_TRACE: | |
1944 | { | |
1945 | /* | |
1946 | * On the first start, if we have a kernel session and we have | |
1947 | * enabled time or size-based rotations, we have to make sure | |
1948 | * the kernel tracer supports it. | |
1949 | */ | |
1950 | if (!cmd_ctx->session->has_been_started && \ | |
1951 | cmd_ctx->session->kernel_session && \ | |
1952 | (cmd_ctx->session->rotate_timer_period || \ | |
1953 | cmd_ctx->session->rotate_size) && \ | |
1954 | !check_rotate_compatible()) { | |
1955 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1956 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1957 | goto error; | |
1958 | } | |
1959 | ret = cmd_start_trace(cmd_ctx->session); | |
1960 | break; | |
1961 | } | |
1962 | case LTTNG_STOP_TRACE: | |
1963 | { | |
1964 | ret = cmd_stop_trace(cmd_ctx->session); | |
1965 | break; | |
1966 | } | |
917a718d JG |
1967 | case LTTNG_DESTROY_SESSION: |
1968 | { | |
1969 | ret = cmd_destroy_session(cmd_ctx->session, | |
3e3665b8 JG |
1970 | notification_thread_handle, |
1971 | sock); | |
917a718d JG |
1972 | break; |
1973 | } | |
1974 | case LTTNG_LIST_DOMAINS: | |
1975 | { | |
1976 | ssize_t nb_dom; | |
1977 | struct lttng_domain *domains = NULL; | |
1978 | ||
1979 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1980 | if (nb_dom < 0) { | |
1981 | /* Return value is a negative lttng_error_code. */ | |
1982 | ret = -nb_dom; | |
1983 | goto error; | |
1984 | } | |
1985 | ||
1986 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1987 | nb_dom * sizeof(struct lttng_domain)); | |
1988 | free(domains); | |
1989 | ||
1990 | if (ret < 0) { | |
1991 | goto setup_error; | |
1992 | } | |
1993 | ||
1994 | ret = LTTNG_OK; | |
1995 | break; | |
1996 | } | |
1997 | case LTTNG_LIST_CHANNELS: | |
1998 | { | |
1999 | ssize_t payload_size; | |
2000 | struct lttng_channel *channels = NULL; | |
2001 | ||
3a91de3a | 2002 | payload_size = cmd_list_channels(cmd_ctx->lsm.domain.type, |
917a718d JG |
2003 | cmd_ctx->session, &channels); |
2004 | if (payload_size < 0) { | |
2005 | /* Return value is a negative lttng_error_code. */ | |
2006 | ret = -payload_size; | |
2007 | goto error; | |
2008 | } | |
2009 | ||
2010 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
2011 | payload_size); | |
2012 | free(channels); | |
2013 | ||
2014 | if (ret < 0) { | |
2015 | goto setup_error; | |
2016 | } | |
2017 | ||
2018 | ret = LTTNG_OK; | |
2019 | break; | |
2020 | } | |
c3e68e71 JR |
2021 | case LTTNG_LIST_MAPS: |
2022 | { | |
2023 | struct lttng_map_list *return_map_list = NULL; | |
2024 | size_t original_payload_size; | |
2025 | size_t payload_size; | |
2026 | ||
2027 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2028 | if (ret) { | |
2029 | ret = LTTNG_ERR_NOMEM; | |
2030 | goto setup_error; | |
2031 | } | |
2032 | ||
2033 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2034 | ||
2035 | ret = cmd_list_maps(cmd_ctx->lsm.domain.type, cmd_ctx->session, | |
2036 | &return_map_list); | |
2037 | if (ret != LTTNG_OK) { | |
2038 | goto error; | |
2039 | } | |
2040 | ||
2041 | assert(return_map_list); | |
2042 | ret = lttng_map_list_serialize(return_map_list, | |
2043 | &cmd_ctx->reply_payload); | |
2044 | lttng_map_list_destroy(return_map_list); | |
2045 | if (ret) { | |
2046 | ERR("Failed to serialize map_list in reply to `%s` command", | |
2047 | lttcomm_sessiond_command_str(cmd_ctx->lsm.cmd_type)); | |
2048 | ret = LTTNG_ERR_NOMEM; | |
2049 | goto error; | |
2050 | } | |
2051 | ||
2052 | payload_size = cmd_ctx->reply_payload.buffer.size - | |
2053 | original_payload_size; | |
2054 | ||
2055 | update_lttng_msg(cmd_ctx, 0, payload_size); | |
2056 | ||
2057 | ret = LTTNG_OK; | |
2058 | break; | |
2059 | } | |
917a718d JG |
2060 | case LTTNG_LIST_EVENTS: |
2061 | { | |
e368fb43 JG |
2062 | ssize_t list_ret; |
2063 | struct lttcomm_event_command_header cmd_header = {}; | |
2064 | size_t original_payload_size; | |
2065 | size_t payload_size; | |
2066 | ||
2067 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2068 | if (ret) { | |
2069 | ret = LTTNG_ERR_NOMEM; | |
2070 | goto setup_error; | |
917a718d JG |
2071 | } |
2072 | ||
e368fb43 | 2073 | original_payload_size = cmd_ctx->reply_payload.buffer.size; |
917a718d | 2074 | |
e368fb43 JG |
2075 | /* Extended infos are included at the end of the payload. */ |
2076 | list_ret = cmd_list_events(cmd_ctx->lsm.domain.type, | |
2077 | cmd_ctx->session, | |
2078 | cmd_ctx->lsm.u.list.channel_name, | |
2079 | &cmd_ctx->reply_payload); | |
2080 | if (list_ret < 0) { | |
2081 | /* Return value is a negative lttng_error_code. */ | |
2082 | ret = -list_ret; | |
2083 | goto error; | |
917a718d JG |
2084 | } |
2085 | ||
e368fb43 JG |
2086 | payload_size = cmd_ctx->reply_payload.buffer.size - |
2087 | sizeof(cmd_header) - original_payload_size; | |
2088 | update_lttng_msg(cmd_ctx, sizeof(cmd_header), payload_size); | |
2089 | ||
917a718d JG |
2090 | ret = LTTNG_OK; |
2091 | break; | |
2092 | } | |
2093 | case LTTNG_LIST_SESSIONS: | |
2094 | { | |
2095 | unsigned int nr_sessions; | |
2096 | void *sessions_payload; | |
2097 | size_t payload_len; | |
2098 | ||
2099 | session_lock_list(); | |
2100 | nr_sessions = lttng_sessions_count( | |
2101 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2102 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e JG |
2103 | |
2104 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + | |
2105 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
917a718d JG |
2106 | sessions_payload = zmalloc(payload_len); |
2107 | ||
2108 | if (!sessions_payload) { | |
2109 | session_unlock_list(); | |
2110 | ret = -ENOMEM; | |
2111 | goto setup_error; | |
2112 | } | |
2113 | ||
b178f53e | 2114 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
917a718d JG |
2115 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2116 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
2117 | session_unlock_list(); | |
2118 | ||
2119 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
2120 | payload_len); | |
2121 | free(sessions_payload); | |
2122 | ||
2123 | if (ret < 0) { | |
2124 | goto setup_error; | |
2125 | } | |
2126 | ||
2127 | ret = LTTNG_OK; | |
2128 | break; | |
2129 | } | |
2130 | case LTTNG_REGISTER_CONSUMER: | |
2131 | { | |
2132 | struct consumer_data *cdata; | |
2133 | ||
3a91de3a | 2134 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
2135 | case LTTNG_DOMAIN_KERNEL: |
2136 | cdata = &kconsumer_data; | |
2137 | break; | |
2138 | default: | |
2139 | ret = LTTNG_ERR_UND; | |
2140 | goto error; | |
2141 | } | |
2142 | ||
3a91de3a JG |
2143 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
2144 | cmd_ctx->lsm.u.reg.path, cdata); | |
917a718d JG |
2145 | break; |
2146 | } | |
2147 | case LTTNG_DATA_PENDING: | |
2148 | { | |
2149 | int pending_ret; | |
2150 | uint8_t pending_ret_byte; | |
2151 | ||
2152 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
2153 | ||
2154 | /* | |
2155 | * FIXME | |
2156 | * | |
2157 | * This function may returns 0 or 1 to indicate whether or not | |
2158 | * there is data pending. In case of error, it should return an | |
2159 | * LTTNG_ERR code. However, some code paths may still return | |
2160 | * a nondescript error code, which we handle by returning an | |
2161 | * "unknown" error. | |
2162 | */ | |
2163 | if (pending_ret == 0 || pending_ret == 1) { | |
2164 | /* | |
2165 | * ret will be set to LTTNG_OK at the end of | |
2166 | * this function. | |
2167 | */ | |
2168 | } else if (pending_ret < 0) { | |
2169 | ret = LTTNG_ERR_UNK; | |
2170 | goto setup_error; | |
2171 | } else { | |
2172 | ret = pending_ret; | |
2173 | goto setup_error; | |
2174 | } | |
2175 | ||
2176 | pending_ret_byte = (uint8_t) pending_ret; | |
2177 | ||
2178 | /* 1 byte to return whether or not data is pending */ | |
2179 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
2180 | &pending_ret_byte, 1); | |
2181 | ||
2182 | if (ret < 0) { | |
2183 | goto setup_error; | |
2184 | } | |
2185 | ||
2186 | ret = LTTNG_OK; | |
2187 | break; | |
2188 | } | |
2189 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
2190 | { | |
a914e76a | 2191 | uint32_t snapshot_id; |
917a718d JG |
2192 | struct lttcomm_lttng_output_id reply; |
2193 | ||
2194 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3a91de3a | 2195 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output), |
df4f5a87 | 2196 | &snapshot_id); |
917a718d JG |
2197 | if (ret != LTTNG_OK) { |
2198 | goto error; | |
2199 | } | |
a914e76a | 2200 | reply.id = snapshot_id; |
917a718d JG |
2201 | |
2202 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
2203 | sizeof(reply)); | |
2204 | if (ret < 0) { | |
2205 | goto setup_error; | |
2206 | } | |
2207 | ||
2208 | /* Copy output list into message payload */ | |
2209 | ret = LTTNG_OK; | |
2210 | break; | |
2211 | } | |
2212 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2213 | { | |
2214 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
3a91de3a | 2215 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output)); |
917a718d JG |
2216 | break; |
2217 | } | |
2218 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2219 | { | |
2220 | ssize_t nb_output; | |
2221 | struct lttng_snapshot_output *outputs = NULL; | |
2222 | ||
2223 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
2224 | if (nb_output < 0) { | |
2225 | ret = -nb_output; | |
2226 | goto error; | |
2227 | } | |
2228 | ||
2229 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
2230 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
2231 | nb_output * sizeof(struct lttng_snapshot_output)); | |
2232 | free(outputs); | |
2233 | ||
2234 | if (ret < 0) { | |
2235 | goto setup_error; | |
2236 | } | |
2237 | ||
2238 | ret = LTTNG_OK; | |
2239 | break; | |
2240 | } | |
2241 | case LTTNG_SNAPSHOT_RECORD: | |
2242 | { | |
2243 | ret = cmd_snapshot_record(cmd_ctx->session, | |
3a91de3a JG |
2244 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_record.output), |
2245 | cmd_ctx->lsm.u.snapshot_record.wait); | |
917a718d JG |
2246 | break; |
2247 | } | |
b178f53e | 2248 | case LTTNG_CREATE_SESSION_EXT: |
917a718d | 2249 | { |
b178f53e JG |
2250 | struct lttng_dynamic_buffer payload; |
2251 | struct lttng_session_descriptor *return_descriptor = NULL; | |
917a718d | 2252 | |
b178f53e | 2253 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 2254 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
2255 | if (ret != LTTNG_OK) { |
2256 | goto error; | |
917a718d JG |
2257 | } |
2258 | ||
b178f53e JG |
2259 | ret = lttng_session_descriptor_serialize(return_descriptor, |
2260 | &payload); | |
2261 | if (ret) { | |
2262 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
2263 | lttng_session_descriptor_destroy(return_descriptor); | |
2264 | ret = LTTNG_ERR_NOMEM; | |
2265 | goto error; | |
917a718d | 2266 | } |
b178f53e JG |
2267 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
2268 | payload.size); | |
2269 | if (ret) { | |
2270 | lttng_session_descriptor_destroy(return_descriptor); | |
2271 | ret = LTTNG_ERR_NOMEM; | |
2272 | goto error; | |
2273 | } | |
2274 | lttng_dynamic_buffer_reset(&payload); | |
2275 | lttng_session_descriptor_destroy(return_descriptor); | |
2276 | ret = LTTNG_OK; | |
917a718d JG |
2277 | break; |
2278 | } | |
2279 | case LTTNG_SAVE_SESSION: | |
2280 | { | |
3a91de3a | 2281 | ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr, |
917a718d JG |
2282 | &cmd_ctx->creds); |
2283 | break; | |
2284 | } | |
2285 | case LTTNG_SET_SESSION_SHM_PATH: | |
2286 | { | |
2287 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
3a91de3a | 2288 | cmd_ctx->lsm.u.set_shm_path.shm_path); |
917a718d JG |
2289 | break; |
2290 | } | |
2291 | case LTTNG_REGENERATE_METADATA: | |
2292 | { | |
2293 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
2294 | break; | |
2295 | } | |
2296 | case LTTNG_REGENERATE_STATEDUMP: | |
2297 | { | |
2298 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
2299 | break; | |
2300 | } | |
2301 | case LTTNG_REGISTER_TRIGGER: | |
2302 | { | |
746e08d7 | 2303 | struct lttng_trigger *payload_trigger; |
242388e4 | 2304 | struct lttng_trigger *return_trigger; |
746e08d7 JG |
2305 | size_t original_reply_payload_size; |
2306 | size_t reply_payload_size; | |
2307 | const struct lttng_credentials cmd_creds = { | |
2308 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2309 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2310 | }; | |
242388e4 JR |
2311 | |
2312 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2313 | if (ret) { | |
2314 | ret = LTTNG_ERR_NOMEM; | |
2315 | goto setup_error; | |
2316 | } | |
2317 | ||
746e08d7 JG |
2318 | ret = receive_lttng_trigger( |
2319 | cmd_ctx, *sock, sock_error, &payload_trigger); | |
2320 | if (ret != LTTNG_OK) { | |
2321 | goto error; | |
2322 | } | |
2323 | ||
2324 | original_reply_payload_size = cmd_ctx->reply_payload.buffer.size; | |
242388e4 | 2325 | |
746e08d7 | 2326 | ret = cmd_register_trigger(&cmd_creds, payload_trigger, |
242388e4 JR |
2327 | notification_thread_handle, &return_trigger); |
2328 | if (ret != LTTNG_OK) { | |
746e08d7 | 2329 | lttng_trigger_put(payload_trigger); |
242388e4 JR |
2330 | goto error; |
2331 | } | |
2332 | ||
2333 | ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload); | |
746e08d7 JG |
2334 | lttng_trigger_put(payload_trigger); |
2335 | lttng_trigger_put(return_trigger); | |
242388e4 JR |
2336 | if (ret) { |
2337 | ERR("Failed to serialize trigger in reply to \"register trigger\" command"); | |
2338 | ret = LTTNG_ERR_NOMEM; | |
242388e4 JR |
2339 | goto error; |
2340 | } | |
2341 | ||
746e08d7 JG |
2342 | reply_payload_size = cmd_ctx->reply_payload.buffer.size - |
2343 | original_reply_payload_size; | |
242388e4 | 2344 | |
746e08d7 | 2345 | update_lttng_msg(cmd_ctx, 0, reply_payload_size); |
242388e4 JR |
2346 | |
2347 | ret = LTTNG_OK; | |
917a718d JG |
2348 | break; |
2349 | } | |
2350 | case LTTNG_UNREGISTER_TRIGGER: | |
2351 | { | |
746e08d7 JG |
2352 | struct lttng_trigger *payload_trigger; |
2353 | const struct lttng_credentials cmd_creds = { | |
2354 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2355 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2356 | }; | |
2357 | ||
2358 | ret = receive_lttng_trigger( | |
2359 | cmd_ctx, *sock, sock_error, &payload_trigger); | |
2360 | if (ret != LTTNG_OK) { | |
2361 | goto error; | |
2362 | } | |
2363 | ||
2364 | ret = cmd_unregister_trigger(&cmd_creds, payload_trigger, | |
917a718d | 2365 | notification_thread_handle); |
746e08d7 | 2366 | lttng_trigger_put(payload_trigger); |
917a718d JG |
2367 | break; |
2368 | } | |
2369 | case LTTNG_ROTATE_SESSION: | |
2370 | { | |
2371 | struct lttng_rotate_session_return rotate_return; | |
2372 | ||
2373 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
2374 | ||
2375 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
2376 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2377 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2378 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2379 | goto error; | |
2380 | } | |
2381 | ||
7fdbed1c | 2382 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
343defc2 MD |
2383 | false, |
2384 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
917a718d JG |
2385 | if (ret < 0) { |
2386 | ret = -ret; | |
2387 | goto error; | |
2388 | } | |
2389 | ||
2390 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
2391 | sizeof(rotate_return)); | |
2392 | if (ret < 0) { | |
2393 | ret = -ret; | |
2394 | goto error; | |
2395 | } | |
2396 | ||
2397 | ret = LTTNG_OK; | |
2398 | break; | |
2399 | } | |
2400 | case LTTNG_ROTATION_GET_INFO: | |
2401 | { | |
2402 | struct lttng_rotation_get_info_return get_info_return; | |
2403 | ||
2404 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
2405 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
3a91de3a | 2406 | cmd_ctx->lsm.u.get_rotation_info.rotation_id); |
917a718d JG |
2407 | if (ret < 0) { |
2408 | ret = -ret; | |
2409 | goto error; | |
2410 | } | |
2411 | ||
2412 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
2413 | sizeof(get_info_return)); | |
2414 | if (ret < 0) { | |
2415 | ret = -ret; | |
2416 | goto error; | |
2417 | } | |
2418 | ||
2419 | ret = LTTNG_OK; | |
2420 | break; | |
2421 | } | |
2422 | case LTTNG_ROTATION_SET_SCHEDULE: | |
2423 | { | |
2424 | bool set_schedule; | |
2425 | enum lttng_rotation_schedule_type schedule_type; | |
2426 | uint64_t value; | |
2427 | ||
2428 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2429 | DBG("Kernel tracer version does not support session rotations"); | |
2430 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2431 | goto error; | |
2432 | } | |
2433 | ||
3a91de3a JG |
2434 | set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1; |
2435 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type; | |
2436 | value = cmd_ctx->lsm.u.rotation_set_schedule.value; | |
917a718d JG |
2437 | |
2438 | ret = cmd_rotation_set_schedule(cmd_ctx->session, | |
2439 | set_schedule, | |
2440 | schedule_type, | |
2441 | value, | |
2442 | notification_thread_handle); | |
2443 | if (ret != LTTNG_OK) { | |
2444 | goto error; | |
2445 | } | |
2446 | ||
2447 | break; | |
2448 | } | |
2449 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
2450 | { | |
2451 | struct lttng_session_list_schedules_return schedules = { | |
2452 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
2453 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
2454 | .size.set = !!cmd_ctx->session->rotate_size, | |
2455 | .size.value = cmd_ctx->session->rotate_size, | |
2456 | }; | |
2457 | ||
2458 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
2459 | sizeof(schedules)); | |
2460 | if (ret < 0) { | |
2461 | ret = -ret; | |
2462 | goto error; | |
2463 | } | |
2464 | ||
2465 | ret = LTTNG_OK; | |
2466 | break; | |
2467 | } | |
022349df MD |
2468 | case LTTNG_CLEAR_SESSION: |
2469 | { | |
2470 | ret = cmd_clear_session(cmd_ctx->session, sock); | |
2471 | break; | |
2472 | } | |
fbc9f37d JR |
2473 | case LTTNG_LIST_TRIGGERS: |
2474 | { | |
2475 | struct lttng_triggers *return_triggers = NULL; | |
2476 | size_t original_payload_size; | |
2477 | size_t payload_size; | |
2478 | ||
2479 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2480 | if (ret) { | |
2481 | ret = LTTNG_ERR_NOMEM; | |
2482 | goto setup_error; | |
2483 | } | |
2484 | ||
2485 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2486 | ||
2487 | ret = cmd_list_triggers(cmd_ctx, | |
2488 | notification_thread_handle, &return_triggers); | |
2489 | if (ret != LTTNG_OK) { | |
2490 | goto error; | |
2491 | } | |
2492 | ||
2493 | assert(return_triggers); | |
2494 | ret = lttng_triggers_serialize( | |
2495 | return_triggers, &cmd_ctx->reply_payload); | |
2496 | lttng_triggers_destroy(return_triggers); | |
2497 | if (ret) { | |
2498 | ERR("Failed to serialize triggers in reply to `list triggers` command"); | |
2499 | ret = LTTNG_ERR_NOMEM; | |
2500 | goto error; | |
2501 | } | |
2502 | ||
2503 | payload_size = cmd_ctx->reply_payload.buffer.size - | |
2504 | original_payload_size; | |
2505 | ||
2506 | update_lttng_msg(cmd_ctx, 0, payload_size); | |
2507 | ||
2508 | ret = LTTNG_OK; | |
2509 | break; | |
2510 | } | |
c3e68e71 JR |
2511 | case LTTNG_LIST_MAP_VALUES: |
2512 | { | |
2513 | struct lttng_map_content *return_map_content = NULL; | |
2514 | struct lttng_map *payload_map = NULL; | |
2515 | struct lttng_map_query *payload_map_query = NULL; | |
2516 | size_t original_reply_payload_size; | |
2517 | size_t reply_payload_size; | |
2518 | ||
2519 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2520 | if (ret) { | |
2521 | ret = LTTNG_ERR_NOMEM; | |
2522 | goto setup_error; | |
2523 | } | |
2524 | ||
2525 | original_reply_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2526 | ||
2527 | ret = receive_lttng_map(*sock, sock_error, | |
2528 | cmd_ctx->lsm.u.list_map_values.map_length, | |
2529 | &payload_map); | |
2530 | if (ret != LTTNG_OK) { | |
2531 | goto error; | |
2532 | } | |
2533 | ||
2534 | ret = receive_lttng_map_query(*sock, sock_error, | |
2535 | cmd_ctx->lsm.u.list_map_values.query_length, | |
2536 | &payload_map_query); | |
2537 | if (ret != LTTNG_OK) { | |
2538 | goto error; | |
2539 | } | |
2540 | ||
2541 | ret = cmd_list_map_values(cmd_ctx->lsm.session.name, | |
2542 | payload_map, payload_map_query, | |
2543 | &return_map_content); | |
2544 | if (ret != LTTNG_OK) { | |
2545 | goto error; | |
2546 | } | |
2547 | assert(return_map_content); | |
2548 | ret = lttng_map_content_serialize(return_map_content, | |
2549 | &cmd_ctx->reply_payload); | |
2550 | lttng_map_content_destroy(return_map_content); | |
2551 | if (ret) { | |
2552 | ERR("Failed to serialize key-value pair list in reply to `list map values` command"); | |
2553 | ret = LTTNG_ERR_NOMEM; | |
2554 | goto error; | |
2555 | } | |
2556 | ||
2557 | reply_payload_size = cmd_ctx->reply_payload.buffer.size - | |
2558 | original_reply_payload_size; | |
2559 | ||
2560 | update_lttng_msg(cmd_ctx, 0, reply_payload_size); | |
2561 | ||
2562 | ret = LTTNG_OK; | |
2563 | break; | |
2564 | } | |
917a718d JG |
2565 | default: |
2566 | ret = LTTNG_ERR_UND; | |
2567 | break; | |
2568 | } | |
2569 | ||
2570 | error: | |
3a91de3a JG |
2571 | if (cmd_ctx->reply_payload.buffer.size == 0) { |
2572 | DBG("Missing llm header, creating one."); | |
917a718d JG |
2573 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
2574 | goto setup_error; | |
2575 | } | |
2576 | } | |
2577 | /* Set return code */ | |
3a91de3a | 2578 | ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret; |
917a718d JG |
2579 | setup_error: |
2580 | if (cmd_ctx->session) { | |
2581 | session_unlock(cmd_ctx->session); | |
2582 | session_put(cmd_ctx->session); | |
3e3665b8 | 2583 | cmd_ctx->session = NULL; |
917a718d JG |
2584 | } |
2585 | if (need_tracing_session) { | |
2586 | session_unlock_list(); | |
2587 | } | |
2588 | init_setup_error: | |
2589 | assert(!rcu_read_ongoing()); | |
2590 | return ret; | |
2591 | } | |
2592 | ||
2593 | static int create_client_sock(void) | |
2594 | { | |
2595 | int ret, client_sock; | |
2596 | const mode_t old_umask = umask(0); | |
2597 | ||
2598 | /* Create client tool unix socket */ | |
2599 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); | |
2600 | if (client_sock < 0) { | |
2601 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); | |
2602 | ret = -1; | |
2603 | goto end; | |
2604 | } | |
2605 | ||
2606 | /* Set the cloexec flag */ | |
2607 | ret = utils_set_fd_cloexec(client_sock); | |
2608 | if (ret < 0) { | |
2609 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
2610 | "Continuing but note that the consumer daemon will have a " | |
2611 | "reference to this socket on exec()", client_sock); | |
2612 | } | |
2613 | ||
2614 | /* File permission MUST be 660 */ | |
2615 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2616 | if (ret < 0) { | |
18972083 JR |
2617 | ERR("Set file permissions failed: %s", |
2618 | config.client_unix_sock_path.value); | |
917a718d | 2619 | PERROR("chmod"); |
18972083 JR |
2620 | (void) lttcomm_close_unix_sock(client_sock); |
2621 | ret = -1; | |
917a718d JG |
2622 | goto end; |
2623 | } | |
2624 | DBG("Created client socket (fd = %i)", client_sock); | |
2625 | ret = client_sock; | |
2626 | end: | |
2627 | umask(old_umask); | |
2628 | return ret; | |
2629 | } | |
2630 | ||
2631 | static void cleanup_client_thread(void *data) | |
2632 | { | |
2633 | struct lttng_pipe *quit_pipe = data; | |
2634 | ||
2635 | lttng_pipe_destroy(quit_pipe); | |
2636 | } | |
2637 | ||
6cb45e93 JG |
2638 | static void thread_init_cleanup(void *data) |
2639 | { | |
2640 | set_thread_status(false); | |
2641 | } | |
2642 | ||
917a718d JG |
2643 | /* |
2644 | * This thread manage all clients request using the unix client socket for | |
2645 | * communication. | |
2646 | */ | |
2647 | static void *thread_manage_clients(void *data) | |
2648 | { | |
2649 | int sock = -1, ret, i, pollfd, err = -1; | |
2650 | int sock_error; | |
2651 | uint32_t revents, nb_fd; | |
917a718d | 2652 | struct lttng_poll_event events; |
0f68efb6 | 2653 | const int client_sock = thread_state.client_sock; |
917a718d JG |
2654 | struct lttng_pipe *quit_pipe = data; |
2655 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
3a91de3a | 2656 | struct command_ctx cmd_ctx = {}; |
917a718d JG |
2657 | |
2658 | DBG("[thread] Manage client started"); | |
2659 | ||
3a91de3a JG |
2660 | lttng_payload_init(&cmd_ctx.reply_payload); |
2661 | ||
917a718d JG |
2662 | is_root = (getuid() == 0); |
2663 | ||
6cb45e93 | 2664 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2665 | |
2666 | rcu_register_thread(); | |
2667 | ||
2668 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); | |
2669 | ||
2670 | health_code_update(); | |
2671 | ||
2672 | ret = lttcomm_listen_unix_sock(client_sock); | |
2673 | if (ret < 0) { | |
2674 | goto error_listen; | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2679 | * more will be added to this poll set. | |
2680 | */ | |
2681 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2682 | if (ret < 0) { | |
2683 | goto error_create_poll; | |
2684 | } | |
2685 | ||
2686 | /* Add the application registration socket */ | |
2687 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2688 | if (ret < 0) { | |
2689 | goto error; | |
2690 | } | |
2691 | ||
2692 | /* Add thread quit pipe */ | |
2693 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2694 | if (ret < 0) { | |
2695 | goto error; | |
2696 | } | |
2697 | ||
6cb45e93 | 2698 | /* Set state as running. */ |
0d163d56 | 2699 | set_thread_status(true); |
6cb45e93 JG |
2700 | pthread_cleanup_pop(0); |
2701 | ||
917a718d JG |
2702 | /* This testpoint is after we signal readiness to the parent. */ |
2703 | if (testpoint(sessiond_thread_manage_clients)) { | |
2704 | goto error; | |
2705 | } | |
2706 | ||
2707 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2708 | goto error; | |
2709 | } | |
2710 | ||
2711 | health_code_update(); | |
2712 | ||
917a718d JG |
2713 | while (1) { |
2714 | const struct cmd_completion_handler *cmd_completion_handler; | |
2715 | ||
3a91de3a JG |
2716 | cmd_ctx.creds = (lttng_sock_cred) { |
2717 | .uid = UINT32_MAX, | |
2718 | .gid = UINT32_MAX, | |
2719 | }; | |
2720 | cmd_ctx.session = NULL; | |
fe489250 | 2721 | lttng_payload_clear(&cmd_ctx.reply_payload); |
e368fb43 | 2722 | cmd_ctx.lttng_msg_size = 0; |
3a91de3a | 2723 | |
917a718d JG |
2724 | DBG("Accepting client command ..."); |
2725 | ||
2726 | /* Inifinite blocking call, waiting for transmission */ | |
2727 | restart: | |
2728 | health_poll_entry(); | |
2729 | ret = lttng_poll_wait(&events, -1); | |
2730 | health_poll_exit(); | |
2731 | if (ret < 0) { | |
2732 | /* | |
2733 | * Restart interrupted system call. | |
2734 | */ | |
2735 | if (errno == EINTR) { | |
2736 | goto restart; | |
2737 | } | |
2738 | goto error; | |
2739 | } | |
2740 | ||
2741 | nb_fd = ret; | |
2742 | ||
2743 | for (i = 0; i < nb_fd; i++) { | |
2744 | revents = LTTNG_POLL_GETEV(&events, i); | |
2745 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2746 | ||
2747 | health_code_update(); | |
2748 | ||
917a718d JG |
2749 | if (pollfd == thread_quit_pipe_fd) { |
2750 | err = 0; | |
2751 | goto exit; | |
2752 | } else { | |
2753 | /* Event on the registration socket */ | |
2754 | if (revents & LPOLLIN) { | |
2755 | continue; | |
2756 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2757 | ERR("Client socket poll error"); | |
2758 | goto error; | |
2759 | } else { | |
2760 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2761 | goto error; | |
2762 | } | |
2763 | } | |
2764 | } | |
2765 | ||
2766 | DBG("Wait for client response"); | |
2767 | ||
2768 | health_code_update(); | |
2769 | ||
2770 | sock = lttcomm_accept_unix_sock(client_sock); | |
2771 | if (sock < 0) { | |
2772 | goto error; | |
2773 | } | |
2774 | ||
2775 | /* | |
2776 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2777 | * show must go on. | |
2778 | */ | |
2779 | (void) utils_set_fd_cloexec(sock); | |
2780 | ||
2781 | /* Set socket option for credentials retrieval */ | |
2782 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2783 | if (ret < 0) { | |
2784 | goto error; | |
2785 | } | |
2786 | ||
917a718d JG |
2787 | health_code_update(); |
2788 | ||
2789 | /* | |
2790 | * Data is received from the lttng client. The struct | |
2791 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2792 | * the client. | |
2793 | */ | |
2794 | DBG("Receiving data from client ..."); | |
3a91de3a JG |
2795 | ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm, |
2796 | sizeof(struct lttcomm_session_msg), &cmd_ctx.creds); | |
2797 | if (ret != sizeof(struct lttcomm_session_msg)) { | |
2798 | DBG("Incomplete recv() from client... continuing"); | |
917a718d JG |
2799 | ret = close(sock); |
2800 | if (ret) { | |
2801 | PERROR("close"); | |
2802 | } | |
2803 | sock = -1; | |
917a718d JG |
2804 | continue; |
2805 | } | |
2806 | ||
2807 | health_code_update(); | |
2808 | ||
2809 | // TODO: Validate cmd_ctx including sanity check for | |
2810 | // security purpose. | |
2811 | ||
2812 | rcu_thread_online(); | |
2813 | /* | |
2814 | * This function dispatch the work to the kernel or userspace tracer | |
2815 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2816 | * informations for the client. The command context struct contains | |
2817 | * everything this function may needs. | |
2818 | */ | |
3a91de3a | 2819 | ret = process_client_msg(&cmd_ctx, &sock, &sock_error); |
917a718d JG |
2820 | rcu_thread_offline(); |
2821 | if (ret < 0) { | |
3e3665b8 JG |
2822 | if (sock >= 0) { |
2823 | ret = close(sock); | |
2824 | if (ret) { | |
2825 | PERROR("close"); | |
2826 | } | |
4a76dfd3 JR |
2827 | } |
2828 | sock = -1; | |
917a718d JG |
2829 | /* |
2830 | * TODO: Inform client somehow of the fatal error. At | |
2831 | * this point, ret < 0 means that a zmalloc failed | |
2832 | * (ENOMEM). Error detected but still accept | |
2833 | * command, unless a socket error has been | |
2834 | * detected. | |
2835 | */ | |
917a718d JG |
2836 | continue; |
2837 | } | |
2838 | ||
c7e9ffbd | 2839 | if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) { |
7e397c55 FD |
2840 | WARN("Command returned an invalid status code, returning unknown error: " |
2841 | "command type = %s (%d), ret = %d", | |
2842 | lttcomm_sessiond_command_str(cmd_ctx.lsm.cmd_type), | |
2843 | cmd_ctx.lsm.cmd_type, ret); | |
c7e9ffbd JG |
2844 | ret = LTTNG_ERR_UNK; |
2845 | } | |
2846 | ||
917a718d JG |
2847 | cmd_completion_handler = cmd_pop_completion_handler(); |
2848 | if (cmd_completion_handler) { | |
2849 | enum lttng_error_code completion_code; | |
2850 | ||
2851 | completion_code = cmd_completion_handler->run( | |
2852 | cmd_completion_handler->data); | |
2853 | if (completion_code != LTTNG_OK) { | |
917a718d JG |
2854 | continue; |
2855 | } | |
2856 | } | |
2857 | ||
2858 | health_code_update(); | |
2859 | ||
3e3665b8 | 2860 | if (sock >= 0) { |
3a91de3a JG |
2861 | struct lttng_payload_view view = |
2862 | lttng_payload_view_from_payload( | |
2863 | &cmd_ctx.reply_payload, | |
2864 | 0, -1); | |
e368fb43 | 2865 | struct lttcomm_lttng_msg *llm = (typeof( |
3a91de3a JG |
2866 | llm)) cmd_ctx.reply_payload.buffer.data; |
2867 | ||
37f3c202 | 2868 | assert(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm)); |
3a91de3a JG |
2869 | assert(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size); |
2870 | ||
fe489250 | 2871 | llm->fd_count = lttng_payload_view_get_fd_handle_count(&view); |
e368fb43 | 2872 | |
3e3665b8 | 2873 | DBG("Sending response (size: %d, retcode: %s (%d))", |
3a91de3a JG |
2874 | cmd_ctx.lttng_msg_size, |
2875 | lttng_strerror(-llm->ret_code), | |
2876 | llm->ret_code); | |
2877 | ret = send_unix_sock(sock, &view); | |
3e3665b8 JG |
2878 | if (ret < 0) { |
2879 | ERR("Failed to send data back to client"); | |
2880 | } | |
917a718d | 2881 | |
3e3665b8 JG |
2882 | /* End of transmission */ |
2883 | ret = close(sock); | |
2884 | if (ret) { | |
2885 | PERROR("close"); | |
2886 | } | |
4a76dfd3 JR |
2887 | } |
2888 | sock = -1; | |
917a718d | 2889 | |
917a718d JG |
2890 | health_code_update(); |
2891 | } | |
2892 | ||
2893 | exit: | |
2894 | error: | |
2895 | if (sock >= 0) { | |
2896 | ret = close(sock); | |
2897 | if (ret) { | |
2898 | PERROR("close"); | |
2899 | } | |
2900 | } | |
2901 | ||
2902 | lttng_poll_clean(&events); | |
917a718d JG |
2903 | |
2904 | error_listen: | |
2905 | error_create_poll: | |
2906 | unlink(config.client_unix_sock_path.value); | |
0f68efb6 JG |
2907 | ret = close(client_sock); |
2908 | if (ret) { | |
2909 | PERROR("close"); | |
917a718d JG |
2910 | } |
2911 | ||
2912 | if (err) { | |
2913 | health_error(); | |
2914 | ERR("Health error occurred in %s", __func__); | |
2915 | } | |
2916 | ||
2917 | health_unregister(health_sessiond); | |
2918 | ||
2919 | DBG("Client thread dying"); | |
3a91de3a | 2920 | lttng_payload_reset(&cmd_ctx.reply_payload); |
917a718d | 2921 | rcu_unregister_thread(); |
917a718d JG |
2922 | return NULL; |
2923 | } | |
2924 | ||
2925 | static | |
2926 | bool shutdown_client_thread(void *thread_data) | |
2927 | { | |
2928 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2929 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2930 | ||
2931 | return notify_thread_pipe(write_fd) == 1; | |
2932 | } | |
2933 | ||
2934 | struct lttng_thread *launch_client_thread(void) | |
2935 | { | |
6cb45e93 | 2936 | bool thread_running; |
917a718d | 2937 | struct lttng_pipe *client_quit_pipe; |
0f68efb6 JG |
2938 | struct lttng_thread *thread = NULL; |
2939 | int client_sock_fd = -1; | |
917a718d | 2940 | |
6cb45e93 | 2941 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2942 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2943 | if (!client_quit_pipe) { | |
2944 | goto error; | |
2945 | } | |
2946 | ||
0f68efb6 JG |
2947 | client_sock_fd = create_client_sock(); |
2948 | if (client_sock_fd < 0) { | |
2949 | goto error; | |
2950 | } | |
2951 | ||
2952 | thread_state.client_sock = client_sock_fd; | |
917a718d JG |
2953 | thread = lttng_thread_create("Client management", |
2954 | thread_manage_clients, | |
2955 | shutdown_client_thread, | |
2956 | cleanup_client_thread, | |
2957 | client_quit_pipe); | |
2958 | if (!thread) { | |
2959 | goto error; | |
2960 | } | |
0f68efb6 JG |
2961 | /* The client thread now owns the client sock fd and the quit pipe. */ |
2962 | client_sock_fd = -1; | |
2963 | client_quit_pipe = NULL; | |
917a718d JG |
2964 | |
2965 | /* | |
2966 | * This thread is part of the threads that need to be fully | |
2967 | * initialized before the session daemon is marked as "ready". | |
2968 | */ | |
6cb45e93 JG |
2969 | thread_running = wait_thread_status(); |
2970 | if (!thread_running) { | |
0f68efb6 | 2971 | goto error; |
6cb45e93 | 2972 | } |
917a718d JG |
2973 | return thread; |
2974 | error: | |
0f68efb6 JG |
2975 | if (client_sock_fd >= 0) { |
2976 | if (close(client_sock_fd)) { | |
2977 | PERROR("Failed to close client socket"); | |
2978 | } | |
2979 | } | |
2980 | lttng_thread_put(thread); | |
917a718d JG |
2981 | cleanup_client_thread(client_quit_pipe); |
2982 | return NULL; | |
2983 | } |