Commit | Line | Data |
---|---|---|
917a718d | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
917a718d | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
917a718d | 7 | * |
917a718d JG |
8 | */ |
9 | ||
159b042f | 10 | #include "common/buffer-view.h" |
3a91de3a | 11 | #include "common/compat/socket.h" |
159b042f | 12 | #include "common/dynamic-buffer.h" |
3a91de3a | 13 | #include "common/dynamic-array.h" |
9e620ea7 JG |
14 | #include "common/payload.h" |
15 | #include "common/payload-view.h" | |
fe489250 | 16 | #include "common/fd-handle.h" |
159b042f | 17 | #include "common/sessiond-comm/sessiond-comm.h" |
e368fb43 JG |
18 | #include "common/payload.h" |
19 | #include "common/payload-view.h" | |
159b042f JG |
20 | #include "lttng/lttng-error.h" |
21 | #include "lttng/tracker.h" | |
917a718d | 22 | #include <common/compat/getenv.h> |
159b042f | 23 | #include <common/tracker.h> |
917a718d JG |
24 | #include <common/unix.h> |
25 | #include <common/utils.h> | |
917a718d | 26 | #include <lttng/event-internal.h> |
b178f53e | 27 | #include <lttng/session-descriptor-internal.h> |
159b042f JG |
28 | #include <lttng/session-internal.h> |
29 | #include <lttng/userspace-probe-internal.h> | |
30 | #include <pthread.h> | |
31 | #include <signal.h> | |
32 | #include <stddef.h> | |
33 | #include <sys/stat.h> | |
917a718d JG |
34 | |
35 | #include "client.h" | |
36 | #include "lttng-sessiond.h" | |
37 | #include "cmd.h" | |
38 | #include "kernel.h" | |
39 | #include "save.h" | |
40 | #include "health-sessiond.h" | |
41 | #include "testpoint.h" | |
42 | #include "utils.h" | |
4ec029ed | 43 | #include "manage-consumer.h" |
022349df | 44 | #include "clear.h" |
917a718d JG |
45 | |
46 | static bool is_root; | |
47 | ||
48 | static struct thread_state { | |
6cb45e93 JG |
49 | sem_t ready; |
50 | bool running; | |
0f68efb6 | 51 | int client_sock; |
6cb45e93 JG |
52 | } thread_state; |
53 | ||
54 | static void set_thread_status(bool running) | |
917a718d | 55 | { |
6cb45e93 JG |
56 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
57 | thread_state.running = running; | |
58 | sem_post(&thread_state.ready); | |
917a718d JG |
59 | } |
60 | ||
6cb45e93 | 61 | static bool wait_thread_status(void) |
917a718d | 62 | { |
6cb45e93 JG |
63 | DBG("Waiting for client thread to be ready"); |
64 | sem_wait(&thread_state.ready); | |
65 | if (thread_state.running) { | |
66 | DBG("Client thread is ready"); | |
67 | } else { | |
68 | ERR("Initialization of client thread failed"); | |
917a718d | 69 | } |
6cb45e93 JG |
70 | |
71 | return thread_state.running; | |
917a718d JG |
72 | } |
73 | ||
74 | /* | |
75 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
76 | * right amount of memory and copying the original information from the lsm | |
77 | * structure. | |
78 | * | |
79 | * Return 0 on success, negative value on error. | |
80 | */ | |
81 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
82 | const void *payload_buf, size_t payload_len, | |
83 | const void *cmd_header_buf, size_t cmd_header_len) | |
84 | { | |
85 | int ret = 0; | |
86 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
917a718d | 87 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; |
3a91de3a JG |
88 | const struct lttcomm_lttng_msg llm = { |
89 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
90 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
91 | .cmd_header_size = cmd_header_len, | |
92 | .data_size = payload_len, | |
93 | }; | |
917a718d | 94 | |
3a91de3a | 95 | lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
fe489250 | 96 | lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles); |
917a718d | 97 | |
3a91de3a JG |
98 | cmd_ctx->lttng_msg_size = total_msg_size; |
99 | ||
100 | /* Append reply header. */ | |
101 | ret = lttng_dynamic_buffer_append( | |
102 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
103 | if (ret) { | |
917a718d JG |
104 | goto end; |
105 | } | |
106 | ||
3a91de3a | 107 | /* Append command header. */ |
917a718d | 108 | if (cmd_header_len) { |
3a91de3a JG |
109 | ret = lttng_dynamic_buffer_append( |
110 | &cmd_ctx->reply_payload.buffer, cmd_header_buf, | |
111 | cmd_header_len); | |
112 | if (ret) { | |
113 | goto end; | |
114 | } | |
917a718d JG |
115 | } |
116 | ||
3a91de3a | 117 | /* Append payload. */ |
917a718d | 118 | if (payload_len) { |
3a91de3a JG |
119 | ret = lttng_dynamic_buffer_append( |
120 | &cmd_ctx->reply_payload.buffer, payload_buf, | |
121 | payload_len); | |
122 | if (ret) { | |
123 | goto end; | |
124 | } | |
917a718d JG |
125 | } |
126 | ||
127 | end: | |
128 | return ret; | |
129 | } | |
130 | ||
e368fb43 JG |
131 | static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx) |
132 | { | |
133 | int ret; | |
134 | const struct lttcomm_lttng_msg llm = {}; | |
135 | ||
136 | lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); | |
137 | ||
138 | /* Append place-holder reply header. */ | |
139 | ret = lttng_dynamic_buffer_append( | |
140 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
141 | if (ret) { | |
142 | goto end; | |
143 | } | |
144 | ||
145 | cmd_ctx->lttng_msg_size = sizeof(llm); | |
146 | end: | |
147 | return ret; | |
148 | } | |
149 | ||
150 | static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len, | |
151 | size_t payload_len) | |
152 | { | |
153 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
154 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
155 | const struct lttcomm_lttng_msg llm = { | |
156 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
157 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
158 | .cmd_header_size = cmd_header_len, | |
159 | .data_size = payload_len, | |
160 | }; | |
161 | struct lttcomm_lttng_msg *p_llm; | |
162 | ||
163 | assert(cmd_ctx->reply_payload.buffer.size >= sizeof(llm)); | |
164 | ||
165 | p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data; | |
166 | ||
167 | /* Update existing header. */ | |
168 | memcpy(p_llm, &llm, sizeof(llm)); | |
169 | ||
170 | cmd_ctx->lttng_msg_size = total_msg_size; | |
171 | } | |
172 | ||
917a718d JG |
173 | /* |
174 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 175 | * exec or it will fail. |
917a718d JG |
176 | */ |
177 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
178 | { | |
4ec029ed | 179 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
180 | } |
181 | ||
182 | /* | |
183 | * Fork and exec a consumer daemon (consumerd). | |
184 | * | |
185 | * Return pid if successful else -1. | |
186 | */ | |
187 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
188 | { | |
189 | int ret; | |
190 | pid_t pid; | |
191 | const char *consumer_to_use; | |
192 | const char *verbosity; | |
193 | struct stat st; | |
194 | ||
195 | DBG("Spawning consumerd"); | |
196 | ||
197 | pid = fork(); | |
198 | if (pid == 0) { | |
199 | /* | |
200 | * Exec consumerd. | |
201 | */ | |
202 | if (config.verbose_consumer) { | |
203 | verbosity = "--verbose"; | |
204 | } else if (lttng_opt_quiet) { | |
205 | verbosity = "--quiet"; | |
206 | } else { | |
207 | verbosity = ""; | |
208 | } | |
209 | ||
210 | switch (consumer_data->type) { | |
211 | case LTTNG_CONSUMER_KERNEL: | |
212 | /* | |
213 | * Find out which consumerd to execute. We will first try the | |
214 | * 64-bit path, then the sessiond's installation directory, and | |
215 | * fallback on the 32-bit one, | |
216 | */ | |
217 | DBG3("Looking for a kernel consumer at these locations:"); | |
218 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); | |
219 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); | |
220 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); | |
221 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { | |
222 | DBG3("Found location #1"); | |
223 | consumer_to_use = config.consumerd64_bin_path.value; | |
224 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
225 | DBG3("Found location #2"); | |
226 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
227 | } else if (config.consumerd32_bin_path.value && | |
228 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
229 | DBG3("Found location #3"); | |
230 | consumer_to_use = config.consumerd32_bin_path.value; | |
231 | } else { | |
232 | DBG("Could not find any valid consumerd executable"); | |
233 | ret = -EINVAL; | |
234 | goto error; | |
235 | } | |
236 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
237 | (void) execl(consumer_to_use, | |
238 | "lttng-consumerd", verbosity, "-k", | |
239 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
240 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
241 | "--group", config.tracing_group_name.value, | |
242 | NULL); | |
243 | break; | |
244 | case LTTNG_CONSUMER64_UST: | |
245 | { | |
246 | if (config.consumerd64_lib_dir.value) { | |
b53d4e59 | 247 | const char *tmp; |
917a718d JG |
248 | size_t tmplen; |
249 | char *tmpnew; | |
250 | ||
251 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
252 | if (!tmp) { | |
253 | tmp = ""; | |
254 | } | |
255 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
256 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
257 | if (!tmpnew) { | |
258 | ret = -ENOMEM; | |
259 | goto error; | |
260 | } | |
261 | strcat(tmpnew, config.consumerd64_lib_dir.value); | |
262 | if (tmp[0] != '\0') { | |
263 | strcat(tmpnew, ":"); | |
264 | strcat(tmpnew, tmp); | |
265 | } | |
266 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
267 | free(tmpnew); | |
268 | if (ret) { | |
269 | ret = -errno; | |
270 | goto error; | |
271 | } | |
272 | } | |
273 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); | |
274 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
275 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
276 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
277 | "--group", config.tracing_group_name.value, | |
278 | NULL); | |
279 | break; | |
280 | } | |
281 | case LTTNG_CONSUMER32_UST: | |
282 | { | |
283 | if (config.consumerd32_lib_dir.value) { | |
b53d4e59 | 284 | const char *tmp; |
917a718d JG |
285 | size_t tmplen; |
286 | char *tmpnew; | |
287 | ||
288 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
289 | if (!tmp) { | |
290 | tmp = ""; | |
291 | } | |
292 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
293 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
294 | if (!tmpnew) { | |
295 | ret = -ENOMEM; | |
296 | goto error; | |
297 | } | |
298 | strcat(tmpnew, config.consumerd32_lib_dir.value); | |
299 | if (tmp[0] != '\0') { | |
300 | strcat(tmpnew, ":"); | |
301 | strcat(tmpnew, tmp); | |
302 | } | |
303 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
304 | free(tmpnew); | |
305 | if (ret) { | |
306 | ret = -errno; | |
307 | goto error; | |
308 | } | |
309 | } | |
310 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); | |
311 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
312 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
313 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
314 | "--group", config.tracing_group_name.value, | |
315 | NULL); | |
316 | break; | |
317 | } | |
318 | default: | |
319 | ERR("unknown consumer type"); | |
320 | errno = 0; | |
321 | } | |
322 | if (errno != 0) { | |
323 | PERROR("Consumer execl()"); | |
324 | } | |
325 | /* Reaching this point, we got a failure on our execl(). */ | |
326 | exit(EXIT_FAILURE); | |
327 | } else if (pid > 0) { | |
328 | ret = pid; | |
329 | } else { | |
330 | PERROR("start consumer fork"); | |
331 | ret = -errno; | |
332 | } | |
333 | error: | |
334 | return ret; | |
335 | } | |
336 | ||
337 | /* | |
338 | * Spawn the consumerd daemon and session daemon thread. | |
339 | */ | |
340 | static int start_consumerd(struct consumer_data *consumer_data) | |
341 | { | |
342 | int ret; | |
343 | ||
344 | /* | |
345 | * Set the listen() state on the socket since there is a possible race | |
346 | * between the exec() of the consumer daemon and this call if place in the | |
347 | * consumer thread. See bug #366 for more details. | |
348 | */ | |
349 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
350 | if (ret < 0) { | |
351 | goto error; | |
352 | } | |
353 | ||
354 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
355 | if (consumer_data->pid != 0) { | |
356 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
357 | goto end; | |
358 | } | |
359 | ||
360 | ret = spawn_consumerd(consumer_data); | |
361 | if (ret < 0) { | |
362 | ERR("Spawning consumerd failed"); | |
363 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
364 | goto error; | |
365 | } | |
366 | ||
367 | /* Setting up the consumer_data pid */ | |
368 | consumer_data->pid = ret; | |
369 | DBG2("Consumer pid %d", consumer_data->pid); | |
370 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
371 | ||
372 | DBG2("Spawning consumer control thread"); | |
373 | ret = spawn_consumer_thread(consumer_data); | |
374 | if (ret < 0) { | |
375 | ERR("Fatal error spawning consumer control thread"); | |
376 | goto error; | |
377 | } | |
378 | ||
379 | end: | |
380 | return 0; | |
381 | ||
382 | error: | |
383 | /* Cleanup already created sockets on error. */ | |
384 | if (consumer_data->err_sock >= 0) { | |
385 | int err; | |
386 | ||
387 | err = close(consumer_data->err_sock); | |
388 | if (err < 0) { | |
389 | PERROR("close consumer data error socket"); | |
390 | } | |
391 | } | |
392 | return ret; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Copy consumer output from the tracing session to the domain session. The | |
397 | * function also applies the right modification on a per domain basis for the | |
398 | * trace files destination directory. | |
399 | * | |
400 | * Should *NOT* be called with RCU read-side lock held. | |
401 | */ | |
402 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
403 | { | |
404 | int ret; | |
405 | const char *dir_name; | |
406 | struct consumer_output *consumer; | |
407 | ||
408 | assert(session); | |
409 | assert(session->consumer); | |
410 | ||
411 | switch (domain) { | |
412 | case LTTNG_DOMAIN_KERNEL: | |
413 | DBG3("Copying tracing session consumer output in kernel session"); | |
414 | /* | |
415 | * XXX: We should audit the session creation and what this function | |
416 | * does "extra" in order to avoid a destroy since this function is used | |
417 | * in the domain session creation (kernel and ust) only. Same for UST | |
418 | * domain. | |
419 | */ | |
420 | if (session->kernel_session->consumer) { | |
421 | consumer_output_put(session->kernel_session->consumer); | |
422 | } | |
423 | session->kernel_session->consumer = | |
424 | consumer_copy_output(session->consumer); | |
425 | /* Ease our life a bit for the next part */ | |
426 | consumer = session->kernel_session->consumer; | |
427 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
428 | break; | |
429 | case LTTNG_DOMAIN_JUL: | |
430 | case LTTNG_DOMAIN_LOG4J: | |
431 | case LTTNG_DOMAIN_PYTHON: | |
432 | case LTTNG_DOMAIN_UST: | |
433 | DBG3("Copying tracing session consumer output in UST session"); | |
434 | if (session->ust_session->consumer) { | |
435 | consumer_output_put(session->ust_session->consumer); | |
436 | } | |
437 | session->ust_session->consumer = | |
438 | consumer_copy_output(session->consumer); | |
439 | /* Ease our life a bit for the next part */ | |
440 | consumer = session->ust_session->consumer; | |
441 | dir_name = DEFAULT_UST_TRACE_DIR; | |
442 | break; | |
443 | default: | |
444 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
445 | goto error; | |
446 | } | |
447 | ||
448 | /* Append correct directory to subdir */ | |
b178f53e JG |
449 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
450 | sizeof(consumer->domain_subdir)); | |
451 | if (ret) { | |
452 | ret = LTTNG_ERR_UNK; | |
453 | goto error; | |
454 | } | |
455 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
456 | ret = LTTNG_OK; |
457 | ||
458 | error: | |
459 | return ret; | |
460 | } | |
461 | ||
462 | /* | |
463 | * Create an UST session and add it to the session ust list. | |
464 | * | |
465 | * Should *NOT* be called with RCU read-side lock held. | |
466 | */ | |
467 | static int create_ust_session(struct ltt_session *session, | |
df4f5a87 | 468 | const struct lttng_domain *domain) |
917a718d JG |
469 | { |
470 | int ret; | |
471 | struct ltt_ust_session *lus = NULL; | |
472 | ||
473 | assert(session); | |
474 | assert(domain); | |
475 | assert(session->consumer); | |
476 | ||
477 | switch (domain->type) { | |
478 | case LTTNG_DOMAIN_JUL: | |
479 | case LTTNG_DOMAIN_LOG4J: | |
480 | case LTTNG_DOMAIN_PYTHON: | |
481 | case LTTNG_DOMAIN_UST: | |
482 | break; | |
483 | default: | |
484 | ERR("Unknown UST domain on create session %d", domain->type); | |
485 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
486 | goto error; | |
487 | } | |
488 | ||
489 | DBG("Creating UST session"); | |
490 | ||
491 | lus = trace_ust_create_session(session->id); | |
492 | if (lus == NULL) { | |
493 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
494 | goto error; | |
495 | } | |
496 | ||
497 | lus->uid = session->uid; | |
498 | lus->gid = session->gid; | |
499 | lus->output_traces = session->output_traces; | |
500 | lus->snapshot_mode = session->snapshot_mode; | |
501 | lus->live_timer_interval = session->live_timer; | |
502 | session->ust_session = lus; | |
503 | if (session->shm_path[0]) { | |
504 | strncpy(lus->root_shm_path, session->shm_path, | |
505 | sizeof(lus->root_shm_path)); | |
506 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
507 | strncpy(lus->shm_path, session->shm_path, | |
508 | sizeof(lus->shm_path)); | |
509 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
510 | strncat(lus->shm_path, "/ust", | |
511 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
512 | } | |
513 | /* Copy session output to the newly created UST session */ | |
514 | ret = copy_session_consumer(domain->type, session); | |
515 | if (ret != LTTNG_OK) { | |
516 | goto error; | |
517 | } | |
518 | ||
519 | return LTTNG_OK; | |
520 | ||
521 | error: | |
522 | free(lus); | |
523 | session->ust_session = NULL; | |
524 | return ret; | |
525 | } | |
526 | ||
527 | /* | |
528 | * Create a kernel tracer session then create the default channel. | |
529 | */ | |
530 | static int create_kernel_session(struct ltt_session *session) | |
531 | { | |
532 | int ret; | |
533 | ||
534 | DBG("Creating kernel session"); | |
535 | ||
7d268848 | 536 | ret = kernel_create_session(session); |
917a718d JG |
537 | if (ret < 0) { |
538 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 539 | goto error_create; |
917a718d JG |
540 | } |
541 | ||
542 | /* Code flow safety */ | |
543 | assert(session->kernel_session); | |
544 | ||
545 | /* Copy session output to the newly created Kernel session */ | |
546 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
547 | if (ret != LTTNG_OK) { | |
548 | goto error; | |
549 | } | |
550 | ||
551 | session->kernel_session->uid = session->uid; | |
552 | session->kernel_session->gid = session->gid; | |
553 | session->kernel_session->output_traces = session->output_traces; | |
554 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
a2814ea7 | 555 | session->kernel_session->is_live_session = session->live_timer != 0; |
917a718d JG |
556 | |
557 | return LTTNG_OK; | |
558 | ||
559 | error: | |
560 | trace_kernel_destroy_session(session->kernel_session); | |
561 | session->kernel_session = NULL; | |
5d0a7bcb | 562 | error_create: |
917a718d JG |
563 | return ret; |
564 | } | |
565 | ||
566 | /* | |
567 | * Count number of session permitted by uid/gid. | |
568 | */ | |
569 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
570 | { | |
571 | unsigned int i = 0; | |
572 | struct ltt_session *session; | |
573 | const struct ltt_session_list *session_list = session_get_list(); | |
574 | ||
575 | DBG("Counting number of available session for UID %d GID %d", | |
576 | uid, gid); | |
577 | cds_list_for_each_entry(session, &session_list->head, list) { | |
578 | if (!session_get(session)) { | |
579 | continue; | |
580 | } | |
581 | session_lock(session); | |
582 | /* Only count the sessions the user can control. */ | |
583 | if (session_access_ok(session, uid, gid) && | |
584 | !session->destroyed) { | |
585 | i++; | |
586 | } | |
587 | session_unlock(session); | |
588 | session_put(session); | |
589 | } | |
590 | return i; | |
591 | } | |
592 | ||
593 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
594 | int *sock_error, struct lttng_event *event) | |
595 | { | |
fe489250 | 596 | int fd = -1, ret; |
917a718d | 597 | struct lttng_userspace_probe_location *probe_location; |
e368fb43 | 598 | struct lttng_payload probe_location_payload; |
fe489250 | 599 | struct fd_handle *handle = NULL; |
917a718d JG |
600 | |
601 | /* | |
e368fb43 | 602 | * Create a payload to store the serialized version of the probe |
917a718d JG |
603 | * location. |
604 | */ | |
e368fb43 JG |
605 | lttng_payload_init(&probe_location_payload); |
606 | ||
607 | ret = lttng_dynamic_buffer_set_size(&probe_location_payload.buffer, | |
3a91de3a | 608 | cmd_ctx->lsm.u.enable.userspace_probe_location_len); |
917a718d JG |
609 | if (ret) { |
610 | ret = LTTNG_ERR_NOMEM; | |
611 | goto error; | |
612 | } | |
613 | ||
614 | /* | |
615 | * Receive the probe location. | |
616 | */ | |
e368fb43 JG |
617 | ret = lttcomm_recv_unix_sock(sock, probe_location_payload.buffer.data, |
618 | probe_location_payload.buffer.size); | |
917a718d JG |
619 | if (ret <= 0) { |
620 | DBG("Nothing recv() from client var len data... continuing"); | |
621 | *sock_error = 1; | |
917a718d JG |
622 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
623 | goto error; | |
624 | } | |
625 | ||
626 | /* | |
627 | * Receive the file descriptor to the target binary from the client. | |
628 | */ | |
629 | DBG("Receiving userspace probe target FD from client ..."); | |
630 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
631 | if (ret <= 0) { | |
632 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
633 | *sock_error = 1; | |
634 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
635 | goto error; | |
636 | } | |
637 | ||
fe489250 JG |
638 | handle = fd_handle_create(fd); |
639 | if (!handle) { | |
640 | ret = LTTNG_ERR_NOMEM; | |
641 | goto error; | |
642 | } | |
643 | ||
644 | /* Transferred to the handle. */ | |
645 | fd = -1; | |
646 | ||
647 | ret = lttng_payload_push_fd_handle(&probe_location_payload, handle); | |
e368fb43 JG |
648 | if (ret) { |
649 | ERR("Failed to add userspace probe file descriptor to payload"); | |
650 | ret = LTTNG_ERR_NOMEM; | |
917a718d JG |
651 | goto error; |
652 | } | |
653 | ||
fe489250 JG |
654 | fd_handle_put(handle); |
655 | handle = NULL; | |
656 | ||
e368fb43 JG |
657 | { |
658 | struct lttng_payload_view view = lttng_payload_view_from_payload( | |
659 | &probe_location_payload, 0, -1); | |
917a718d | 660 | |
e368fb43 JG |
661 | /* Extract the probe location from the serialized version. */ |
662 | ret = lttng_userspace_probe_location_create_from_payload( | |
663 | &view, &probe_location); | |
664 | } | |
665 | if (ret < 0) { | |
666 | WARN("Failed to create a userspace probe location from the received buffer"); | |
917a718d JG |
667 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
668 | goto error; | |
669 | } | |
670 | ||
671 | /* Attach the probe location to the event. */ | |
672 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
673 | if (ret) { | |
674 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
675 | goto error; | |
676 | } | |
677 | ||
917a718d | 678 | error: |
fe489250 JG |
679 | if (fd >= 0) { |
680 | if (close(fd)) { | |
681 | PERROR("Failed to close userspace probe location binary fd"); | |
682 | } | |
683 | } | |
684 | ||
685 | fd_handle_put(handle); | |
e368fb43 | 686 | lttng_payload_reset(&probe_location_payload); |
917a718d JG |
687 | return ret; |
688 | } | |
689 | ||
917a718d JG |
690 | /* |
691 | * Version of setup_lttng_msg() without command header. | |
692 | */ | |
693 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
694 | void *payload_buf, size_t payload_len) | |
695 | { | |
696 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
697 | } | |
698 | ||
917a718d JG |
699 | /* |
700 | * Check if the current kernel tracer supports the session rotation feature. | |
701 | * Return 1 if it does, 0 otherwise. | |
702 | */ | |
703 | static int check_rotate_compatible(void) | |
704 | { | |
705 | int ret = 1; | |
706 | ||
707 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
708 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
709 | ret = 0; | |
710 | } | |
711 | ||
712 | return ret; | |
713 | } | |
714 | ||
715 | /* | |
716 | * Send data on a unix socket using the liblttsessiondcomm API. | |
717 | * | |
718 | * Return lttcomm error code. | |
719 | */ | |
3a91de3a | 720 | static int send_unix_sock(int sock, struct lttng_payload_view *view) |
917a718d | 721 | { |
3a91de3a | 722 | int ret; |
fe489250 | 723 | const int fd_count = lttng_payload_view_get_fd_handle_count(view); |
3a91de3a | 724 | |
917a718d | 725 | /* Check valid length */ |
3a91de3a JG |
726 | if (view->buffer.size == 0) { |
727 | ret = -1; | |
728 | goto end; | |
729 | } | |
730 | ||
731 | ret = lttcomm_send_unix_sock( | |
732 | sock, view->buffer.data, view->buffer.size); | |
733 | if (ret < 0) { | |
734 | goto end; | |
917a718d JG |
735 | } |
736 | ||
fe489250 | 737 | if (fd_count > 0) { |
700741dc JG |
738 | ret = lttcomm_send_payload_view_fds_unix_sock(sock, view); |
739 | if (ret < 0) { | |
740 | goto end; | |
fe489250 | 741 | } |
3a91de3a JG |
742 | } |
743 | ||
744 | end: | |
745 | return ret; | |
917a718d JG |
746 | } |
747 | ||
748 | /* | |
749 | * Process the command requested by the lttng client within the command | |
750 | * context structure. This function make sure that the return structure (llm) | |
751 | * is set and ready for transmission before returning. | |
752 | * | |
753 | * Return any error encountered or 0 for success. | |
754 | * | |
755 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
756 | * A command may assume the ownership of the socket, in which case its value |
757 | * should be set to -1. | |
917a718d JG |
758 | * |
759 | * Should *NOT* be called with RCU read-side lock held. | |
760 | */ | |
3e3665b8 | 761 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
917a718d JG |
762 | int *sock_error) |
763 | { | |
764 | int ret = LTTNG_OK; | |
765 | int need_tracing_session = 1; | |
766 | int need_domain; | |
767 | ||
3a91de3a | 768 | DBG("Processing client command %d", cmd_ctx->lsm.cmd_type); |
917a718d JG |
769 | |
770 | assert(!rcu_read_ongoing()); | |
771 | ||
772 | *sock_error = 0; | |
773 | ||
3a91de3a | 774 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 775 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
776 | case LTTNG_DESTROY_SESSION: |
777 | case LTTNG_LIST_SESSIONS: | |
778 | case LTTNG_LIST_DOMAINS: | |
779 | case LTTNG_START_TRACE: | |
780 | case LTTNG_STOP_TRACE: | |
781 | case LTTNG_DATA_PENDING: | |
782 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
783 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
784 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
785 | case LTTNG_SNAPSHOT_RECORD: | |
786 | case LTTNG_SAVE_SESSION: | |
787 | case LTTNG_SET_SESSION_SHM_PATH: | |
788 | case LTTNG_REGENERATE_METADATA: | |
789 | case LTTNG_REGENERATE_STATEDUMP: | |
790 | case LTTNG_REGISTER_TRIGGER: | |
791 | case LTTNG_UNREGISTER_TRIGGER: | |
792 | case LTTNG_ROTATE_SESSION: | |
793 | case LTTNG_ROTATION_GET_INFO: | |
794 | case LTTNG_ROTATION_SET_SCHEDULE: | |
795 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
022349df | 796 | case LTTNG_CLEAR_SESSION: |
917a718d JG |
797 | need_domain = 0; |
798 | break; | |
799 | default: | |
800 | need_domain = 1; | |
801 | } | |
802 | ||
803 | if (config.no_kernel && need_domain | |
3a91de3a | 804 | && cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) { |
917a718d JG |
805 | if (!is_root) { |
806 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
807 | } else { | |
808 | ret = LTTNG_ERR_KERN_NA; | |
809 | } | |
810 | goto error; | |
811 | } | |
812 | ||
813 | /* Deny register consumer if we already have a spawned consumer. */ | |
3a91de3a | 814 | if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
815 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
816 | if (kconsumer_data.pid > 0) { | |
817 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
818 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
819 | goto error; | |
820 | } | |
821 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
822 | } | |
823 | ||
824 | /* | |
825 | * Check for command that don't needs to allocate a returned payload. We do | |
826 | * this here so we don't have to make the call for no payload at each | |
827 | * command. | |
828 | */ | |
3a91de3a | 829 | switch(cmd_ctx->lsm.cmd_type) { |
917a718d JG |
830 | case LTTNG_LIST_SESSIONS: |
831 | case LTTNG_LIST_TRACEPOINTS: | |
832 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
833 | case LTTNG_LIST_DOMAINS: | |
834 | case LTTNG_LIST_CHANNELS: | |
835 | case LTTNG_LIST_EVENTS: | |
836 | case LTTNG_LIST_SYSCALLS: | |
159b042f JG |
837 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
838 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
839 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
917a718d JG |
840 | case LTTNG_DATA_PENDING: |
841 | case LTTNG_ROTATE_SESSION: | |
842 | case LTTNG_ROTATION_GET_INFO: | |
917a718d JG |
843 | break; |
844 | default: | |
845 | /* Setup lttng message with no payload */ | |
846 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
847 | if (ret < 0) { | |
848 | /* This label does not try to unlock the session */ | |
849 | goto init_setup_error; | |
850 | } | |
851 | } | |
852 | ||
853 | /* Commands that DO NOT need a session. */ | |
3a91de3a | 854 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 855 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
856 | case LTTNG_LIST_SESSIONS: |
857 | case LTTNG_LIST_TRACEPOINTS: | |
858 | case LTTNG_LIST_SYSCALLS: | |
859 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
860 | case LTTNG_SAVE_SESSION: | |
861 | case LTTNG_REGISTER_TRIGGER: | |
862 | case LTTNG_UNREGISTER_TRIGGER: | |
863 | need_tracing_session = 0; | |
864 | break; | |
865 | default: | |
3a91de3a | 866 | DBG("Getting session %s by name", cmd_ctx->lsm.session.name); |
917a718d JG |
867 | /* |
868 | * We keep the session list lock across _all_ commands | |
869 | * for now, because the per-session lock does not | |
870 | * handle teardown properly. | |
871 | */ | |
872 | session_lock_list(); | |
3a91de3a | 873 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name); |
917a718d JG |
874 | if (cmd_ctx->session == NULL) { |
875 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
876 | goto error; | |
877 | } else { | |
878 | /* Acquire lock for the session */ | |
879 | session_lock(cmd_ctx->session); | |
880 | } | |
881 | break; | |
882 | } | |
883 | ||
884 | /* | |
885 | * Commands that need a valid session but should NOT create one if none | |
886 | * exists. Instead of creating one and destroying it when the command is | |
887 | * handled, process that right before so we save some round trip in useless | |
888 | * code path. | |
889 | */ | |
3a91de3a | 890 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
891 | case LTTNG_DISABLE_CHANNEL: |
892 | case LTTNG_DISABLE_EVENT: | |
3a91de3a | 893 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
894 | case LTTNG_DOMAIN_KERNEL: |
895 | if (!cmd_ctx->session->kernel_session) { | |
896 | ret = LTTNG_ERR_NO_CHANNEL; | |
897 | goto error; | |
898 | } | |
899 | break; | |
900 | case LTTNG_DOMAIN_JUL: | |
901 | case LTTNG_DOMAIN_LOG4J: | |
902 | case LTTNG_DOMAIN_PYTHON: | |
903 | case LTTNG_DOMAIN_UST: | |
904 | if (!cmd_ctx->session->ust_session) { | |
905 | ret = LTTNG_ERR_NO_CHANNEL; | |
906 | goto error; | |
907 | } | |
908 | break; | |
909 | default: | |
910 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
911 | goto error; | |
912 | } | |
913 | default: | |
914 | break; | |
915 | } | |
916 | ||
917 | if (!need_domain) { | |
918 | goto skip_domain; | |
919 | } | |
920 | ||
921 | /* | |
922 | * Check domain type for specific "pre-action". | |
923 | */ | |
3a91de3a | 924 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
925 | case LTTNG_DOMAIN_KERNEL: |
926 | if (!is_root) { | |
927 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
928 | goto error; | |
929 | } | |
930 | ||
7d268848 MD |
931 | /* Kernel tracer check */ |
932 | if (!kernel_tracer_is_initialized()) { | |
933 | /* Basically, load kernel tracer modules */ | |
934 | ret = init_kernel_tracer(); | |
935 | if (ret != 0) { | |
936 | goto error; | |
937 | } | |
938 | } | |
939 | ||
917a718d JG |
940 | /* Consumer is in an ERROR state. Report back to client */ |
941 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
942 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
943 | goto error; | |
944 | } | |
945 | ||
946 | /* Need a session for kernel command */ | |
947 | if (need_tracing_session) { | |
948 | if (cmd_ctx->session->kernel_session == NULL) { | |
949 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 950 | if (ret != LTTNG_OK) { |
917a718d JG |
951 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
952 | goto error; | |
953 | } | |
954 | } | |
955 | ||
956 | /* Start the kernel consumer daemon */ | |
957 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
958 | if (kconsumer_data.pid == 0 && | |
3a91de3a | 959 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
960 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
961 | ret = start_consumerd(&kconsumer_data); | |
962 | if (ret < 0) { | |
963 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
964 | goto error; | |
965 | } | |
966 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); | |
967 | } else { | |
968 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
969 | } | |
970 | ||
971 | /* | |
972 | * The consumer was just spawned so we need to add the socket to | |
973 | * the consumer output of the session if exist. | |
974 | */ | |
975 | ret = consumer_create_socket(&kconsumer_data, | |
976 | cmd_ctx->session->kernel_session->consumer); | |
977 | if (ret < 0) { | |
978 | goto error; | |
979 | } | |
980 | } | |
981 | ||
982 | break; | |
983 | case LTTNG_DOMAIN_JUL: | |
984 | case LTTNG_DOMAIN_LOG4J: | |
985 | case LTTNG_DOMAIN_PYTHON: | |
986 | case LTTNG_DOMAIN_UST: | |
987 | { | |
988 | if (!ust_app_supported()) { | |
989 | ret = LTTNG_ERR_NO_UST; | |
990 | goto error; | |
991 | } | |
992 | /* Consumer is in an ERROR state. Report back to client */ | |
993 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
994 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
995 | goto error; | |
996 | } | |
997 | ||
998 | if (need_tracing_session) { | |
999 | /* Create UST session if none exist. */ | |
1000 | if (cmd_ctx->session->ust_session == NULL) { | |
1001 | ret = create_ust_session(cmd_ctx->session, | |
3a91de3a | 1002 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain)); |
917a718d JG |
1003 | if (ret != LTTNG_OK) { |
1004 | goto error; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | /* Start the UST consumer daemons */ | |
1009 | /* 64-bit */ | |
1010 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
1011 | if (config.consumerd64_bin_path.value && | |
1012 | ustconsumer64_data.pid == 0 && | |
3a91de3a | 1013 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1014 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
1015 | ret = start_consumerd(&ustconsumer64_data); | |
1016 | if (ret < 0) { | |
1017 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
1018 | uatomic_set(&ust_consumerd64_fd, -EINVAL); | |
1019 | goto error; | |
1020 | } | |
1021 | ||
1022 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); | |
1023 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1024 | } else { | |
1025 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Setup socket for consumer 64 bit. No need for atomic access | |
1030 | * since it was set above and can ONLY be set in this thread. | |
1031 | */ | |
1032 | ret = consumer_create_socket(&ustconsumer64_data, | |
1033 | cmd_ctx->session->ust_session->consumer); | |
1034 | if (ret < 0) { | |
1035 | goto error; | |
1036 | } | |
1037 | ||
1038 | /* 32-bit */ | |
1039 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); | |
1040 | if (config.consumerd32_bin_path.value && | |
1041 | ustconsumer32_data.pid == 0 && | |
3a91de3a | 1042 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
917a718d JG |
1043 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
1044 | ret = start_consumerd(&ustconsumer32_data); | |
1045 | if (ret < 0) { | |
1046 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
1047 | uatomic_set(&ust_consumerd32_fd, -EINVAL); | |
1048 | goto error; | |
1049 | } | |
1050 | ||
1051 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); | |
1052 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1053 | } else { | |
1054 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Setup socket for consumer 32 bit. No need for atomic access | |
1059 | * since it was set above and can ONLY be set in this thread. | |
1060 | */ | |
1061 | ret = consumer_create_socket(&ustconsumer32_data, | |
1062 | cmd_ctx->session->ust_session->consumer); | |
1063 | if (ret < 0) { | |
1064 | goto error; | |
1065 | } | |
1066 | } | |
1067 | break; | |
1068 | } | |
1069 | default: | |
1070 | break; | |
1071 | } | |
1072 | skip_domain: | |
1073 | ||
1074 | /* Validate consumer daemon state when start/stop trace command */ | |
3a91de3a JG |
1075 | if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE || |
1076 | cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) { | |
1077 | switch (cmd_ctx->lsm.domain.type) { | |
917a718d JG |
1078 | case LTTNG_DOMAIN_NONE: |
1079 | break; | |
1080 | case LTTNG_DOMAIN_JUL: | |
1081 | case LTTNG_DOMAIN_LOG4J: | |
1082 | case LTTNG_DOMAIN_PYTHON: | |
1083 | case LTTNG_DOMAIN_UST: | |
1084 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
1085 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1086 | goto error; | |
1087 | } | |
1088 | break; | |
1089 | case LTTNG_DOMAIN_KERNEL: | |
1090 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
1091 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
1092 | goto error; | |
1093 | } | |
1094 | break; | |
1095 | default: | |
1096 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1097 | goto error; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * Check that the UID or GID match that of the tracing session. | |
1103 | * The root user can interact with all sessions. | |
1104 | */ | |
1105 | if (need_tracing_session) { | |
1106 | if (!session_access_ok(cmd_ctx->session, | |
1107 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1108 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || | |
1109 | cmd_ctx->session->destroyed) { | |
1110 | ret = LTTNG_ERR_EPERM; | |
1111 | goto error; | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * Send relayd information to consumer as soon as we have a domain and a | |
1117 | * session defined. | |
1118 | */ | |
1119 | if (cmd_ctx->session && need_domain) { | |
1120 | /* | |
1121 | * Setup relayd if not done yet. If the relayd information was already | |
1122 | * sent to the consumer, this call will gracefully return. | |
1123 | */ | |
1124 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1125 | if (ret != LTTNG_OK) { | |
1126 | goto error; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | /* Process by command type */ | |
3a91de3a | 1131 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1132 | case LTTNG_ADD_CONTEXT: |
1133 | { | |
1134 | /* | |
1135 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1136 | * payload if the context being added is an application context. | |
1137 | */ | |
3a91de3a | 1138 | if (cmd_ctx->lsm.u.context.ctx.ctx == |
917a718d JG |
1139 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1140 | char *provider_name = NULL, *context_name = NULL; | |
1141 | size_t provider_name_len = | |
3a91de3a | 1142 | cmd_ctx->lsm.u.context.provider_name_len; |
917a718d | 1143 | size_t context_name_len = |
3a91de3a | 1144 | cmd_ctx->lsm.u.context.context_name_len; |
917a718d JG |
1145 | |
1146 | if (provider_name_len == 0 || context_name_len == 0) { | |
1147 | /* | |
1148 | * Application provider and context names MUST | |
1149 | * be provided. | |
1150 | */ | |
1151 | ret = -LTTNG_ERR_INVALID; | |
1152 | goto error; | |
1153 | } | |
1154 | ||
1155 | provider_name = zmalloc(provider_name_len + 1); | |
1156 | if (!provider_name) { | |
1157 | ret = -LTTNG_ERR_NOMEM; | |
1158 | goto error; | |
1159 | } | |
3a91de3a | 1160 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = |
917a718d JG |
1161 | provider_name; |
1162 | ||
1163 | context_name = zmalloc(context_name_len + 1); | |
1164 | if (!context_name) { | |
1165 | ret = -LTTNG_ERR_NOMEM; | |
1166 | goto error_add_context; | |
1167 | } | |
3a91de3a | 1168 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = |
917a718d JG |
1169 | context_name; |
1170 | ||
3e3665b8 | 1171 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
917a718d JG |
1172 | provider_name_len); |
1173 | if (ret < 0) { | |
1174 | goto error_add_context; | |
1175 | } | |
1176 | ||
3e3665b8 | 1177 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
917a718d JG |
1178 | context_name_len); |
1179 | if (ret < 0) { | |
1180 | goto error_add_context; | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * cmd_add_context assumes ownership of the provider and context | |
1186 | * names. | |
1187 | */ | |
1188 | ret = cmd_add_context(cmd_ctx->session, | |
3a91de3a JG |
1189 | cmd_ctx->lsm.domain.type, |
1190 | cmd_ctx->lsm.u.context.channel_name, | |
1191 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.context.ctx), | |
917a718d JG |
1192 | kernel_poll_pipe[1]); |
1193 | ||
3a91de3a JG |
1194 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = NULL; |
1195 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = NULL; | |
917a718d | 1196 | error_add_context: |
3a91de3a JG |
1197 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name); |
1198 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name); | |
917a718d JG |
1199 | if (ret < 0) { |
1200 | goto error; | |
1201 | } | |
1202 | break; | |
1203 | } | |
1204 | case LTTNG_DISABLE_CHANNEL: | |
1205 | { | |
3a91de3a JG |
1206 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1207 | cmd_ctx->lsm.u.disable.channel_name); | |
917a718d JG |
1208 | break; |
1209 | } | |
1210 | case LTTNG_DISABLE_EVENT: | |
1211 | { | |
1212 | ||
1213 | /* | |
1214 | * FIXME: handle filter; for now we just receive the filter's | |
1215 | * bytecode along with the filter expression which are sent by | |
1216 | * liblttng-ctl and discard them. | |
1217 | * | |
1218 | * This fixes an issue where the client may block while sending | |
1219 | * the filter payload and encounter an error because the session | |
1220 | * daemon closes the socket without ever handling this data. | |
1221 | */ | |
3a91de3a JG |
1222 | size_t count = cmd_ctx->lsm.u.disable.expression_len + |
1223 | cmd_ctx->lsm.u.disable.bytecode_len; | |
917a718d JG |
1224 | |
1225 | if (count) { | |
1226 | char data[LTTNG_FILTER_MAX_LEN]; | |
1227 | ||
1228 | DBG("Discarding disable event command payload of size %zu", count); | |
1229 | while (count) { | |
3e3665b8 | 1230 | ret = lttcomm_recv_unix_sock(*sock, data, |
917a718d JG |
1231 | count > sizeof(data) ? sizeof(data) : count); |
1232 | if (ret < 0) { | |
1233 | goto error; | |
1234 | } | |
1235 | ||
1236 | count -= (size_t) ret; | |
1237 | } | |
1238 | } | |
3a91de3a JG |
1239 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1240 | cmd_ctx->lsm.u.disable.channel_name, | |
1241 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.disable.event)); | |
917a718d JG |
1242 | break; |
1243 | } | |
1244 | case LTTNG_ENABLE_CHANNEL: | |
1245 | { | |
3a91de3a JG |
1246 | cmd_ctx->lsm.u.channel.chan.attr.extended.ptr = |
1247 | (struct lttng_channel_extended *) &cmd_ctx->lsm.u.channel.extended; | |
df4f5a87 | 1248 | ret = cmd_enable_channel(cmd_ctx->session, |
3a91de3a JG |
1249 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1250 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.channel.chan), | |
917a718d JG |
1251 | kernel_poll_pipe[1]); |
1252 | break; | |
1253 | } | |
159b042f JG |
1254 | case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE: |
1255 | case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE: | |
917a718d | 1256 | { |
159b042f JG |
1257 | struct lttng_dynamic_buffer payload; |
1258 | struct lttng_buffer_view payload_view; | |
1259 | const bool add_value = | |
3a91de3a | 1260 | cmd_ctx->lsm.cmd_type == |
159b042f JG |
1261 | LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE; |
1262 | const size_t name_len = | |
3a91de3a | 1263 | cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1264 | .name_len; |
1265 | const enum lttng_domain_type domain_type = | |
1266 | (enum lttng_domain_type) | |
3a91de3a | 1267 | cmd_ctx->lsm.domain.type; |
159b042f | 1268 | const enum lttng_process_attr process_attr = |
3a91de3a | 1269 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1270 | .process_attr_tracker_add_remove_include_value |
1271 | .process_attr; | |
1272 | const enum lttng_process_attr_value_type value_type = | |
1273 | (enum lttng_process_attr_value_type) cmd_ctx | |
3a91de3a | 1274 | ->lsm.u |
159b042f JG |
1275 | .process_attr_tracker_add_remove_include_value |
1276 | .value_type; | |
1277 | struct process_attr_value *value; | |
1278 | enum lttng_error_code ret_code; | |
1279 | ||
1280 | /* Receive remaining variable length payload if applicable. */ | |
1281 | if (name_len > LOGIN_NAME_MAX) { | |
1282 | /* | |
1283 | * POSIX mandates user and group names that are at least | |
1284 | * 8 characters long. Note that although shadow-utils | |
1285 | * (useradd, groupaadd, etc.) use 32 chars as their | |
1286 | * limit (from bits/utmp.h, UT_NAMESIZE), | |
1287 | * LOGIN_NAME_MAX is defined to 256. | |
1288 | */ | |
1289 | ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %d", | |
1290 | add_value ? "addition" : "removal", | |
1291 | name_len, LOGIN_NAME_MAX); | |
1292 | ret = LTTNG_ERR_INVALID; | |
2d97a006 JR |
1293 | goto error; |
1294 | } | |
1295 | ||
159b042f JG |
1296 | lttng_dynamic_buffer_init(&payload); |
1297 | if (name_len != 0) { | |
1298 | /* | |
1299 | * Receive variable payload for user/group name | |
1300 | * arguments. | |
1301 | */ | |
1302 | ret = lttng_dynamic_buffer_set_size(&payload, name_len); | |
1303 | if (ret) { | |
1304 | ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument", | |
1305 | add_value ? "add" : "remove"); | |
55c9e7ca | 1306 | ret = LTTNG_ERR_NOMEM; |
159b042f | 1307 | goto error_add_remove_tracker_value; |
55c9e7ca | 1308 | } |
159b042f JG |
1309 | |
1310 | ret = lttcomm_recv_unix_sock( | |
1311 | *sock, payload.data, name_len); | |
55c9e7ca | 1312 | if (ret <= 0) { |
159b042f JG |
1313 | ERR("Failed to receive payload of %s process attribute tracker value argument", |
1314 | add_value ? "add" : "remove"); | |
55c9e7ca | 1315 | *sock_error = 1; |
159b042f JG |
1316 | ret = LTTNG_ERR_INVALID_PROTOCOL; |
1317 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1318 | } |
159b042f | 1319 | } |
2d97a006 | 1320 | |
159b042f JG |
1321 | payload_view = lttng_buffer_view_from_dynamic_buffer( |
1322 | &payload, 0, name_len); | |
1323 | /* | |
1324 | * Validate the value type and domains are legal for the process | |
1325 | * attribute tracker that is specified and convert the value to | |
1326 | * add/remove to the internal sessiond representation. | |
1327 | */ | |
1328 | ret_code = process_attr_value_from_comm(domain_type, | |
1329 | process_attr, value_type, | |
3a91de3a | 1330 | &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1331 | .integral_value, |
1332 | &payload_view, &value); | |
1333 | if (ret_code != LTTNG_OK) { | |
1334 | ret = ret_code; | |
1335 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1336 | } |
159b042f JG |
1337 | |
1338 | if (add_value) { | |
1339 | ret = cmd_process_attr_tracker_inclusion_set_add_value( | |
1340 | cmd_ctx->session, domain_type, | |
1341 | process_attr, value); | |
1342 | } else { | |
1343 | ret = cmd_process_attr_tracker_inclusion_set_remove_value( | |
1344 | cmd_ctx->session, domain_type, | |
1345 | process_attr, value); | |
1346 | } | |
1347 | process_attr_value_destroy(value); | |
1348 | error_add_remove_tracker_value: | |
1349 | lttng_dynamic_buffer_reset(&payload); | |
1350 | break; | |
1351 | } | |
1352 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
1353 | { | |
1354 | enum lttng_tracking_policy tracking_policy; | |
1355 | const enum lttng_domain_type domain_type = | |
1356 | (enum lttng_domain_type) | |
3a91de3a | 1357 | cmd_ctx->lsm.domain.type; |
159b042f | 1358 | const enum lttng_process_attr process_attr = |
3a91de3a | 1359 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1360 | .process_attr_tracker_get_tracking_policy |
1361 | .process_attr; | |
1362 | ||
1363 | ret = cmd_process_attr_tracker_get_tracking_policy( | |
1364 | cmd_ctx->session, domain_type, process_attr, | |
1365 | &tracking_policy); | |
1366 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1367 | goto error; |
1368 | } | |
2d97a006 | 1369 | |
159b042f JG |
1370 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, |
1371 | &(uint32_t){tracking_policy}, sizeof(uint32_t)); | |
1372 | if (ret < 0) { | |
1373 | ret = LTTNG_ERR_NOMEM; | |
2d97a006 JR |
1374 | goto error; |
1375 | } | |
159b042f | 1376 | ret = LTTNG_OK; |
917a718d JG |
1377 | break; |
1378 | } | |
159b042f | 1379 | case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY: |
917a718d | 1380 | { |
159b042f | 1381 | const enum lttng_tracking_policy tracking_policy = |
3a91de3a | 1382 | (enum lttng_tracking_policy) cmd_ctx->lsm.u |
159b042f JG |
1383 | .process_attr_tracker_set_tracking_policy |
1384 | .tracking_policy; | |
1385 | const enum lttng_domain_type domain_type = | |
1386 | (enum lttng_domain_type) | |
3a91de3a | 1387 | cmd_ctx->lsm.domain.type; |
159b042f | 1388 | const enum lttng_process_attr process_attr = |
3a91de3a | 1389 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1390 | .process_attr_tracker_set_tracking_policy |
1391 | .process_attr; | |
1392 | ||
1393 | ret = cmd_process_attr_tracker_set_tracking_policy( | |
1394 | cmd_ctx->session, domain_type, process_attr, | |
1395 | tracking_policy); | |
1396 | if (ret != LTTNG_OK) { | |
1397 | goto error; | |
55c9e7ca | 1398 | } |
159b042f JG |
1399 | break; |
1400 | } | |
1401 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
1402 | { | |
1403 | struct lttng_process_attr_values *values; | |
1404 | struct lttng_dynamic_buffer reply; | |
1405 | const enum lttng_domain_type domain_type = | |
1406 | (enum lttng_domain_type) | |
3a91de3a | 1407 | cmd_ctx->lsm.domain.type; |
159b042f | 1408 | const enum lttng_process_attr process_attr = |
3a91de3a | 1409 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1410 | .process_attr_tracker_get_inclusion_set |
1411 | .process_attr; | |
1412 | ||
1413 | ret = cmd_process_attr_tracker_get_inclusion_set( | |
1414 | cmd_ctx->session, domain_type, process_attr, | |
1415 | &values); | |
1416 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1417 | goto error; |
1418 | } | |
2d97a006 | 1419 | |
159b042f JG |
1420 | lttng_dynamic_buffer_init(&reply); |
1421 | ret = lttng_process_attr_values_serialize(values, &reply); | |
1422 | if (ret < 0) { | |
1423 | goto error_tracker_get_inclusion_set; | |
2d97a006 JR |
1424 | } |
1425 | ||
159b042f JG |
1426 | ret = setup_lttng_msg_no_cmd_header( |
1427 | cmd_ctx, reply.data, reply.size); | |
1428 | if (ret < 0) { | |
1429 | ret = LTTNG_ERR_NOMEM; | |
1430 | goto error_tracker_get_inclusion_set; | |
1431 | } | |
1432 | ret = LTTNG_OK; | |
1433 | ||
1434 | error_tracker_get_inclusion_set: | |
1435 | lttng_process_attr_values_destroy(values); | |
1436 | lttng_dynamic_buffer_reset(&reply); | |
917a718d JG |
1437 | break; |
1438 | } | |
1439 | case LTTNG_ENABLE_EVENT: | |
1440 | { | |
1441 | struct lttng_event *ev = NULL; | |
1442 | struct lttng_event_exclusion *exclusion = NULL; | |
1443 | struct lttng_filter_bytecode *bytecode = NULL; | |
1444 | char *filter_expression = NULL; | |
1445 | ||
1446 | /* Handle exclusion events and receive it from the client. */ | |
3a91de3a JG |
1447 | if (cmd_ctx->lsm.u.enable.exclusion_count > 0) { |
1448 | size_t count = cmd_ctx->lsm.u.enable.exclusion_count; | |
917a718d JG |
1449 | |
1450 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1451 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1452 | if (!exclusion) { | |
1453 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1454 | goto error; | |
1455 | } | |
1456 | ||
1457 | DBG("Receiving var len exclusion event list from client ..."); | |
1458 | exclusion->count = count; | |
3e3665b8 | 1459 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
917a718d JG |
1460 | count * LTTNG_SYMBOL_NAME_LEN); |
1461 | if (ret <= 0) { | |
1462 | DBG("Nothing recv() from client var len data... continuing"); | |
1463 | *sock_error = 1; | |
1464 | free(exclusion); | |
1465 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1466 | goto error; | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | /* Get filter expression from client. */ | |
3a91de3a | 1471 | if (cmd_ctx->lsm.u.enable.expression_len > 0) { |
917a718d | 1472 | size_t expression_len = |
3a91de3a | 1473 | cmd_ctx->lsm.u.enable.expression_len; |
917a718d JG |
1474 | |
1475 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1476 | ret = LTTNG_ERR_FILTER_INVAL; | |
1477 | free(exclusion); | |
1478 | goto error; | |
1479 | } | |
1480 | ||
1481 | filter_expression = zmalloc(expression_len); | |
1482 | if (!filter_expression) { | |
1483 | free(exclusion); | |
1484 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1485 | goto error; | |
1486 | } | |
1487 | ||
1488 | /* Receive var. len. data */ | |
1489 | DBG("Receiving var len filter's expression from client ..."); | |
3e3665b8 | 1490 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
917a718d JG |
1491 | expression_len); |
1492 | if (ret <= 0) { | |
1493 | DBG("Nothing recv() from client var len data... continuing"); | |
1494 | *sock_error = 1; | |
1495 | free(filter_expression); | |
1496 | free(exclusion); | |
1497 | ret = LTTNG_ERR_FILTER_INVAL; | |
1498 | goto error; | |
1499 | } | |
1500 | } | |
1501 | ||
1502 | /* Handle filter and get bytecode from client. */ | |
3a91de3a JG |
1503 | if (cmd_ctx->lsm.u.enable.bytecode_len > 0) { |
1504 | size_t bytecode_len = cmd_ctx->lsm.u.enable.bytecode_len; | |
917a718d JG |
1505 | |
1506 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1507 | ret = LTTNG_ERR_FILTER_INVAL; | |
1508 | free(filter_expression); | |
1509 | free(exclusion); | |
1510 | goto error; | |
1511 | } | |
1512 | ||
1513 | bytecode = zmalloc(bytecode_len); | |
1514 | if (!bytecode) { | |
1515 | free(filter_expression); | |
1516 | free(exclusion); | |
1517 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1518 | goto error; | |
1519 | } | |
1520 | ||
1521 | /* Receive var. len. data */ | |
1522 | DBG("Receiving var len filter's bytecode from client ..."); | |
3e3665b8 | 1523 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
917a718d JG |
1524 | if (ret <= 0) { |
1525 | DBG("Nothing recv() from client var len data... continuing"); | |
1526 | *sock_error = 1; | |
1527 | free(filter_expression); | |
1528 | free(bytecode); | |
1529 | free(exclusion); | |
1530 | ret = LTTNG_ERR_FILTER_INVAL; | |
1531 | goto error; | |
1532 | } | |
1533 | ||
1534 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1535 | free(filter_expression); | |
1536 | free(bytecode); | |
1537 | free(exclusion); | |
1538 | ret = LTTNG_ERR_FILTER_INVAL; | |
1539 | goto error; | |
1540 | } | |
1541 | } | |
1542 | ||
3a91de3a | 1543 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm.u.enable.event)); |
917a718d JG |
1544 | if (!ev) { |
1545 | DBG("Failed to copy event: %s", | |
3a91de3a | 1546 | cmd_ctx->lsm.u.enable.event.name); |
917a718d JG |
1547 | free(filter_expression); |
1548 | free(bytecode); | |
1549 | free(exclusion); | |
1550 | ret = LTTNG_ERR_NOMEM; | |
1551 | goto error; | |
1552 | } | |
1553 | ||
1554 | ||
3a91de3a | 1555 | if (cmd_ctx->lsm.u.enable.userspace_probe_location_len > 0) { |
917a718d | 1556 | /* Expect a userspace probe description. */ |
3e3665b8 | 1557 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
917a718d JG |
1558 | if (ret) { |
1559 | free(filter_expression); | |
1560 | free(bytecode); | |
1561 | free(exclusion); | |
1562 | lttng_event_destroy(ev); | |
1563 | goto error; | |
1564 | } | |
1565 | } | |
1566 | ||
df4f5a87 | 1567 | ret = cmd_enable_event(cmd_ctx->session, |
3a91de3a JG |
1568 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1569 | cmd_ctx->lsm.u.enable.channel_name, | |
917a718d JG |
1570 | ev, |
1571 | filter_expression, bytecode, exclusion, | |
1572 | kernel_poll_pipe[1]); | |
1573 | lttng_event_destroy(ev); | |
1574 | break; | |
1575 | } | |
1576 | case LTTNG_LIST_TRACEPOINTS: | |
1577 | { | |
1578 | struct lttng_event *events; | |
1579 | ssize_t nb_events; | |
1580 | ||
1581 | session_lock_list(); | |
3a91de3a | 1582 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm.domain.type, &events); |
917a718d JG |
1583 | session_unlock_list(); |
1584 | if (nb_events < 0) { | |
1585 | /* Return value is a negative lttng_error_code. */ | |
1586 | ret = -nb_events; | |
1587 | goto error; | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * Setup lttng message with payload size set to the event list size in | |
1592 | * bytes and then copy list into the llm payload. | |
1593 | */ | |
1594 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1595 | sizeof(struct lttng_event) * nb_events); | |
1596 | free(events); | |
1597 | ||
1598 | if (ret < 0) { | |
1599 | goto setup_error; | |
1600 | } | |
1601 | ||
1602 | ret = LTTNG_OK; | |
1603 | break; | |
1604 | } | |
1605 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1606 | { | |
1607 | struct lttng_event_field *fields; | |
1608 | ssize_t nb_fields; | |
1609 | ||
1610 | session_lock_list(); | |
3a91de3a | 1611 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm.domain.type, |
917a718d JG |
1612 | &fields); |
1613 | session_unlock_list(); | |
1614 | if (nb_fields < 0) { | |
1615 | /* Return value is a negative lttng_error_code. */ | |
1616 | ret = -nb_fields; | |
1617 | goto error; | |
1618 | } | |
1619 | ||
1620 | /* | |
1621 | * Setup lttng message with payload size set to the event list size in | |
1622 | * bytes and then copy list into the llm payload. | |
1623 | */ | |
1624 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1625 | sizeof(struct lttng_event_field) * nb_fields); | |
1626 | free(fields); | |
1627 | ||
1628 | if (ret < 0) { | |
1629 | goto setup_error; | |
1630 | } | |
1631 | ||
1632 | ret = LTTNG_OK; | |
1633 | break; | |
1634 | } | |
1635 | case LTTNG_LIST_SYSCALLS: | |
1636 | { | |
1637 | struct lttng_event *events; | |
1638 | ssize_t nb_events; | |
1639 | ||
1640 | nb_events = cmd_list_syscalls(&events); | |
1641 | if (nb_events < 0) { | |
1642 | /* Return value is a negative lttng_error_code. */ | |
1643 | ret = -nb_events; | |
1644 | goto error; | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * Setup lttng message with payload size set to the event list size in | |
1649 | * bytes and then copy list into the llm payload. | |
1650 | */ | |
1651 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1652 | sizeof(struct lttng_event) * nb_events); | |
1653 | free(events); | |
1654 | ||
1655 | if (ret < 0) { | |
1656 | goto setup_error; | |
1657 | } | |
1658 | ||
1659 | ret = LTTNG_OK; | |
1660 | break; | |
1661 | } | |
917a718d JG |
1662 | case LTTNG_SET_CONSUMER_URI: |
1663 | { | |
1664 | size_t nb_uri, len; | |
1665 | struct lttng_uri *uris; | |
1666 | ||
3a91de3a | 1667 | nb_uri = cmd_ctx->lsm.u.uri.size; |
917a718d JG |
1668 | len = nb_uri * sizeof(struct lttng_uri); |
1669 | ||
1670 | if (nb_uri == 0) { | |
1671 | ret = LTTNG_ERR_INVALID; | |
1672 | goto error; | |
1673 | } | |
1674 | ||
1675 | uris = zmalloc(len); | |
1676 | if (uris == NULL) { | |
1677 | ret = LTTNG_ERR_FATAL; | |
1678 | goto error; | |
1679 | } | |
1680 | ||
1681 | /* Receive variable len data */ | |
1682 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1683 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1684 | if (ret <= 0) { |
1685 | DBG("No URIs received from client... continuing"); | |
1686 | *sock_error = 1; | |
1687 | ret = LTTNG_ERR_SESSION_FAIL; | |
1688 | free(uris); | |
1689 | goto error; | |
1690 | } | |
1691 | ||
1692 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1693 | free(uris); | |
1694 | if (ret != LTTNG_OK) { | |
1695 | goto error; | |
1696 | } | |
1697 | ||
1698 | ||
1699 | break; | |
1700 | } | |
1701 | case LTTNG_START_TRACE: | |
1702 | { | |
1703 | /* | |
1704 | * On the first start, if we have a kernel session and we have | |
1705 | * enabled time or size-based rotations, we have to make sure | |
1706 | * the kernel tracer supports it. | |
1707 | */ | |
1708 | if (!cmd_ctx->session->has_been_started && \ | |
1709 | cmd_ctx->session->kernel_session && \ | |
1710 | (cmd_ctx->session->rotate_timer_period || \ | |
1711 | cmd_ctx->session->rotate_size) && \ | |
1712 | !check_rotate_compatible()) { | |
1713 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1714 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1715 | goto error; | |
1716 | } | |
1717 | ret = cmd_start_trace(cmd_ctx->session); | |
1718 | break; | |
1719 | } | |
1720 | case LTTNG_STOP_TRACE: | |
1721 | { | |
1722 | ret = cmd_stop_trace(cmd_ctx->session); | |
1723 | break; | |
1724 | } | |
917a718d JG |
1725 | case LTTNG_DESTROY_SESSION: |
1726 | { | |
1727 | ret = cmd_destroy_session(cmd_ctx->session, | |
3e3665b8 JG |
1728 | notification_thread_handle, |
1729 | sock); | |
917a718d JG |
1730 | break; |
1731 | } | |
1732 | case LTTNG_LIST_DOMAINS: | |
1733 | { | |
1734 | ssize_t nb_dom; | |
1735 | struct lttng_domain *domains = NULL; | |
1736 | ||
1737 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1738 | if (nb_dom < 0) { | |
1739 | /* Return value is a negative lttng_error_code. */ | |
1740 | ret = -nb_dom; | |
1741 | goto error; | |
1742 | } | |
1743 | ||
1744 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1745 | nb_dom * sizeof(struct lttng_domain)); | |
1746 | free(domains); | |
1747 | ||
1748 | if (ret < 0) { | |
1749 | goto setup_error; | |
1750 | } | |
1751 | ||
1752 | ret = LTTNG_OK; | |
1753 | break; | |
1754 | } | |
1755 | case LTTNG_LIST_CHANNELS: | |
1756 | { | |
1757 | ssize_t payload_size; | |
1758 | struct lttng_channel *channels = NULL; | |
1759 | ||
3a91de3a | 1760 | payload_size = cmd_list_channels(cmd_ctx->lsm.domain.type, |
917a718d JG |
1761 | cmd_ctx->session, &channels); |
1762 | if (payload_size < 0) { | |
1763 | /* Return value is a negative lttng_error_code. */ | |
1764 | ret = -payload_size; | |
1765 | goto error; | |
1766 | } | |
1767 | ||
1768 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
1769 | payload_size); | |
1770 | free(channels); | |
1771 | ||
1772 | if (ret < 0) { | |
1773 | goto setup_error; | |
1774 | } | |
1775 | ||
1776 | ret = LTTNG_OK; | |
1777 | break; | |
1778 | } | |
1779 | case LTTNG_LIST_EVENTS: | |
1780 | { | |
e368fb43 JG |
1781 | ssize_t list_ret; |
1782 | struct lttcomm_event_command_header cmd_header = {}; | |
1783 | size_t original_payload_size; | |
1784 | size_t payload_size; | |
1785 | ||
1786 | ret = setup_empty_lttng_msg(cmd_ctx); | |
1787 | if (ret) { | |
1788 | ret = LTTNG_ERR_NOMEM; | |
1789 | goto setup_error; | |
917a718d JG |
1790 | } |
1791 | ||
e368fb43 | 1792 | original_payload_size = cmd_ctx->reply_payload.buffer.size; |
917a718d | 1793 | |
e368fb43 JG |
1794 | /* Extended infos are included at the end of the payload. */ |
1795 | list_ret = cmd_list_events(cmd_ctx->lsm.domain.type, | |
1796 | cmd_ctx->session, | |
1797 | cmd_ctx->lsm.u.list.channel_name, | |
1798 | &cmd_ctx->reply_payload); | |
1799 | if (list_ret < 0) { | |
1800 | /* Return value is a negative lttng_error_code. */ | |
1801 | ret = -list_ret; | |
1802 | goto error; | |
917a718d JG |
1803 | } |
1804 | ||
e368fb43 JG |
1805 | payload_size = cmd_ctx->reply_payload.buffer.size - |
1806 | sizeof(cmd_header) - original_payload_size; | |
1807 | update_lttng_msg(cmd_ctx, sizeof(cmd_header), payload_size); | |
1808 | ||
917a718d JG |
1809 | ret = LTTNG_OK; |
1810 | break; | |
1811 | } | |
1812 | case LTTNG_LIST_SESSIONS: | |
1813 | { | |
1814 | unsigned int nr_sessions; | |
1815 | void *sessions_payload; | |
1816 | size_t payload_len; | |
1817 | ||
1818 | session_lock_list(); | |
1819 | nr_sessions = lttng_sessions_count( | |
1820 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1821 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e JG |
1822 | |
1823 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + | |
1824 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
917a718d JG |
1825 | sessions_payload = zmalloc(payload_len); |
1826 | ||
1827 | if (!sessions_payload) { | |
1828 | session_unlock_list(); | |
1829 | ret = -ENOMEM; | |
1830 | goto setup_error; | |
1831 | } | |
1832 | ||
b178f53e | 1833 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
917a718d JG |
1834 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
1835 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
1836 | session_unlock_list(); | |
1837 | ||
1838 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
1839 | payload_len); | |
1840 | free(sessions_payload); | |
1841 | ||
1842 | if (ret < 0) { | |
1843 | goto setup_error; | |
1844 | } | |
1845 | ||
1846 | ret = LTTNG_OK; | |
1847 | break; | |
1848 | } | |
1849 | case LTTNG_REGISTER_CONSUMER: | |
1850 | { | |
1851 | struct consumer_data *cdata; | |
1852 | ||
3a91de3a | 1853 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1854 | case LTTNG_DOMAIN_KERNEL: |
1855 | cdata = &kconsumer_data; | |
1856 | break; | |
1857 | default: | |
1858 | ret = LTTNG_ERR_UND; | |
1859 | goto error; | |
1860 | } | |
1861 | ||
3a91de3a JG |
1862 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1863 | cmd_ctx->lsm.u.reg.path, cdata); | |
917a718d JG |
1864 | break; |
1865 | } | |
1866 | case LTTNG_DATA_PENDING: | |
1867 | { | |
1868 | int pending_ret; | |
1869 | uint8_t pending_ret_byte; | |
1870 | ||
1871 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
1872 | ||
1873 | /* | |
1874 | * FIXME | |
1875 | * | |
1876 | * This function may returns 0 or 1 to indicate whether or not | |
1877 | * there is data pending. In case of error, it should return an | |
1878 | * LTTNG_ERR code. However, some code paths may still return | |
1879 | * a nondescript error code, which we handle by returning an | |
1880 | * "unknown" error. | |
1881 | */ | |
1882 | if (pending_ret == 0 || pending_ret == 1) { | |
1883 | /* | |
1884 | * ret will be set to LTTNG_OK at the end of | |
1885 | * this function. | |
1886 | */ | |
1887 | } else if (pending_ret < 0) { | |
1888 | ret = LTTNG_ERR_UNK; | |
1889 | goto setup_error; | |
1890 | } else { | |
1891 | ret = pending_ret; | |
1892 | goto setup_error; | |
1893 | } | |
1894 | ||
1895 | pending_ret_byte = (uint8_t) pending_ret; | |
1896 | ||
1897 | /* 1 byte to return whether or not data is pending */ | |
1898 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
1899 | &pending_ret_byte, 1); | |
1900 | ||
1901 | if (ret < 0) { | |
1902 | goto setup_error; | |
1903 | } | |
1904 | ||
1905 | ret = LTTNG_OK; | |
1906 | break; | |
1907 | } | |
1908 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
1909 | { | |
a914e76a | 1910 | uint32_t snapshot_id; |
917a718d JG |
1911 | struct lttcomm_lttng_output_id reply; |
1912 | ||
1913 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3a91de3a | 1914 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output), |
df4f5a87 | 1915 | &snapshot_id); |
917a718d JG |
1916 | if (ret != LTTNG_OK) { |
1917 | goto error; | |
1918 | } | |
a914e76a | 1919 | reply.id = snapshot_id; |
917a718d JG |
1920 | |
1921 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
1922 | sizeof(reply)); | |
1923 | if (ret < 0) { | |
1924 | goto setup_error; | |
1925 | } | |
1926 | ||
1927 | /* Copy output list into message payload */ | |
1928 | ret = LTTNG_OK; | |
1929 | break; | |
1930 | } | |
1931 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
1932 | { | |
1933 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
3a91de3a | 1934 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output)); |
917a718d JG |
1935 | break; |
1936 | } | |
1937 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
1938 | { | |
1939 | ssize_t nb_output; | |
1940 | struct lttng_snapshot_output *outputs = NULL; | |
1941 | ||
1942 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
1943 | if (nb_output < 0) { | |
1944 | ret = -nb_output; | |
1945 | goto error; | |
1946 | } | |
1947 | ||
1948 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
1949 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
1950 | nb_output * sizeof(struct lttng_snapshot_output)); | |
1951 | free(outputs); | |
1952 | ||
1953 | if (ret < 0) { | |
1954 | goto setup_error; | |
1955 | } | |
1956 | ||
1957 | ret = LTTNG_OK; | |
1958 | break; | |
1959 | } | |
1960 | case LTTNG_SNAPSHOT_RECORD: | |
1961 | { | |
1962 | ret = cmd_snapshot_record(cmd_ctx->session, | |
3a91de3a JG |
1963 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_record.output), |
1964 | cmd_ctx->lsm.u.snapshot_record.wait); | |
917a718d JG |
1965 | break; |
1966 | } | |
b178f53e | 1967 | case LTTNG_CREATE_SESSION_EXT: |
917a718d | 1968 | { |
b178f53e JG |
1969 | struct lttng_dynamic_buffer payload; |
1970 | struct lttng_session_descriptor *return_descriptor = NULL; | |
917a718d | 1971 | |
b178f53e | 1972 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 1973 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
1974 | if (ret != LTTNG_OK) { |
1975 | goto error; | |
917a718d JG |
1976 | } |
1977 | ||
b178f53e JG |
1978 | ret = lttng_session_descriptor_serialize(return_descriptor, |
1979 | &payload); | |
1980 | if (ret) { | |
1981 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
1982 | lttng_session_descriptor_destroy(return_descriptor); | |
1983 | ret = LTTNG_ERR_NOMEM; | |
1984 | goto error; | |
917a718d | 1985 | } |
b178f53e JG |
1986 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
1987 | payload.size); | |
1988 | if (ret) { | |
1989 | lttng_session_descriptor_destroy(return_descriptor); | |
1990 | ret = LTTNG_ERR_NOMEM; | |
1991 | goto error; | |
1992 | } | |
1993 | lttng_dynamic_buffer_reset(&payload); | |
1994 | lttng_session_descriptor_destroy(return_descriptor); | |
1995 | ret = LTTNG_OK; | |
917a718d JG |
1996 | break; |
1997 | } | |
1998 | case LTTNG_SAVE_SESSION: | |
1999 | { | |
3a91de3a | 2000 | ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr, |
917a718d JG |
2001 | &cmd_ctx->creds); |
2002 | break; | |
2003 | } | |
2004 | case LTTNG_SET_SESSION_SHM_PATH: | |
2005 | { | |
2006 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
3a91de3a | 2007 | cmd_ctx->lsm.u.set_shm_path.shm_path); |
917a718d JG |
2008 | break; |
2009 | } | |
2010 | case LTTNG_REGENERATE_METADATA: | |
2011 | { | |
2012 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
2013 | break; | |
2014 | } | |
2015 | case LTTNG_REGENERATE_STATEDUMP: | |
2016 | { | |
2017 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
2018 | break; | |
2019 | } | |
2020 | case LTTNG_REGISTER_TRIGGER: | |
2021 | { | |
3e3665b8 | 2022 | ret = cmd_register_trigger(cmd_ctx, *sock, |
917a718d JG |
2023 | notification_thread_handle); |
2024 | break; | |
2025 | } | |
2026 | case LTTNG_UNREGISTER_TRIGGER: | |
2027 | { | |
3e3665b8 | 2028 | ret = cmd_unregister_trigger(cmd_ctx, *sock, |
917a718d JG |
2029 | notification_thread_handle); |
2030 | break; | |
2031 | } | |
2032 | case LTTNG_ROTATE_SESSION: | |
2033 | { | |
2034 | struct lttng_rotate_session_return rotate_return; | |
2035 | ||
2036 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
2037 | ||
2038 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
2039 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2040 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2041 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2042 | goto error; | |
2043 | } | |
2044 | ||
7fdbed1c | 2045 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
343defc2 MD |
2046 | false, |
2047 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
917a718d JG |
2048 | if (ret < 0) { |
2049 | ret = -ret; | |
2050 | goto error; | |
2051 | } | |
2052 | ||
2053 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
2054 | sizeof(rotate_return)); | |
2055 | if (ret < 0) { | |
2056 | ret = -ret; | |
2057 | goto error; | |
2058 | } | |
2059 | ||
2060 | ret = LTTNG_OK; | |
2061 | break; | |
2062 | } | |
2063 | case LTTNG_ROTATION_GET_INFO: | |
2064 | { | |
2065 | struct lttng_rotation_get_info_return get_info_return; | |
2066 | ||
2067 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
2068 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
3a91de3a | 2069 | cmd_ctx->lsm.u.get_rotation_info.rotation_id); |
917a718d JG |
2070 | if (ret < 0) { |
2071 | ret = -ret; | |
2072 | goto error; | |
2073 | } | |
2074 | ||
2075 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
2076 | sizeof(get_info_return)); | |
2077 | if (ret < 0) { | |
2078 | ret = -ret; | |
2079 | goto error; | |
2080 | } | |
2081 | ||
2082 | ret = LTTNG_OK; | |
2083 | break; | |
2084 | } | |
2085 | case LTTNG_ROTATION_SET_SCHEDULE: | |
2086 | { | |
2087 | bool set_schedule; | |
2088 | enum lttng_rotation_schedule_type schedule_type; | |
2089 | uint64_t value; | |
2090 | ||
2091 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2092 | DBG("Kernel tracer version does not support session rotations"); | |
2093 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2094 | goto error; | |
2095 | } | |
2096 | ||
3a91de3a JG |
2097 | set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1; |
2098 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type; | |
2099 | value = cmd_ctx->lsm.u.rotation_set_schedule.value; | |
917a718d JG |
2100 | |
2101 | ret = cmd_rotation_set_schedule(cmd_ctx->session, | |
2102 | set_schedule, | |
2103 | schedule_type, | |
2104 | value, | |
2105 | notification_thread_handle); | |
2106 | if (ret != LTTNG_OK) { | |
2107 | goto error; | |
2108 | } | |
2109 | ||
2110 | break; | |
2111 | } | |
2112 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
2113 | { | |
2114 | struct lttng_session_list_schedules_return schedules = { | |
2115 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
2116 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
2117 | .size.set = !!cmd_ctx->session->rotate_size, | |
2118 | .size.value = cmd_ctx->session->rotate_size, | |
2119 | }; | |
2120 | ||
2121 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
2122 | sizeof(schedules)); | |
2123 | if (ret < 0) { | |
2124 | ret = -ret; | |
2125 | goto error; | |
2126 | } | |
2127 | ||
2128 | ret = LTTNG_OK; | |
2129 | break; | |
2130 | } | |
022349df MD |
2131 | case LTTNG_CLEAR_SESSION: |
2132 | { | |
2133 | ret = cmd_clear_session(cmd_ctx->session, sock); | |
2134 | break; | |
2135 | } | |
917a718d JG |
2136 | default: |
2137 | ret = LTTNG_ERR_UND; | |
2138 | break; | |
2139 | } | |
2140 | ||
2141 | error: | |
3a91de3a JG |
2142 | if (cmd_ctx->reply_payload.buffer.size == 0) { |
2143 | DBG("Missing llm header, creating one."); | |
917a718d JG |
2144 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
2145 | goto setup_error; | |
2146 | } | |
2147 | } | |
2148 | /* Set return code */ | |
3a91de3a | 2149 | ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret; |
917a718d JG |
2150 | setup_error: |
2151 | if (cmd_ctx->session) { | |
2152 | session_unlock(cmd_ctx->session); | |
2153 | session_put(cmd_ctx->session); | |
3e3665b8 | 2154 | cmd_ctx->session = NULL; |
917a718d JG |
2155 | } |
2156 | if (need_tracing_session) { | |
2157 | session_unlock_list(); | |
2158 | } | |
2159 | init_setup_error: | |
2160 | assert(!rcu_read_ongoing()); | |
2161 | return ret; | |
2162 | } | |
2163 | ||
2164 | static int create_client_sock(void) | |
2165 | { | |
2166 | int ret, client_sock; | |
2167 | const mode_t old_umask = umask(0); | |
2168 | ||
2169 | /* Create client tool unix socket */ | |
2170 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); | |
2171 | if (client_sock < 0) { | |
2172 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); | |
2173 | ret = -1; | |
2174 | goto end; | |
2175 | } | |
2176 | ||
2177 | /* Set the cloexec flag */ | |
2178 | ret = utils_set_fd_cloexec(client_sock); | |
2179 | if (ret < 0) { | |
2180 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
2181 | "Continuing but note that the consumer daemon will have a " | |
2182 | "reference to this socket on exec()", client_sock); | |
2183 | } | |
2184 | ||
2185 | /* File permission MUST be 660 */ | |
2186 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2187 | if (ret < 0) { | |
18972083 JR |
2188 | ERR("Set file permissions failed: %s", |
2189 | config.client_unix_sock_path.value); | |
917a718d | 2190 | PERROR("chmod"); |
18972083 JR |
2191 | (void) lttcomm_close_unix_sock(client_sock); |
2192 | ret = -1; | |
917a718d JG |
2193 | goto end; |
2194 | } | |
2195 | DBG("Created client socket (fd = %i)", client_sock); | |
2196 | ret = client_sock; | |
2197 | end: | |
2198 | umask(old_umask); | |
2199 | return ret; | |
2200 | } | |
2201 | ||
2202 | static void cleanup_client_thread(void *data) | |
2203 | { | |
2204 | struct lttng_pipe *quit_pipe = data; | |
2205 | ||
2206 | lttng_pipe_destroy(quit_pipe); | |
2207 | } | |
2208 | ||
6cb45e93 JG |
2209 | static void thread_init_cleanup(void *data) |
2210 | { | |
2211 | set_thread_status(false); | |
2212 | } | |
2213 | ||
917a718d JG |
2214 | /* |
2215 | * This thread manage all clients request using the unix client socket for | |
2216 | * communication. | |
2217 | */ | |
2218 | static void *thread_manage_clients(void *data) | |
2219 | { | |
2220 | int sock = -1, ret, i, pollfd, err = -1; | |
2221 | int sock_error; | |
2222 | uint32_t revents, nb_fd; | |
917a718d | 2223 | struct lttng_poll_event events; |
0f68efb6 | 2224 | const int client_sock = thread_state.client_sock; |
917a718d JG |
2225 | struct lttng_pipe *quit_pipe = data; |
2226 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
3a91de3a | 2227 | struct command_ctx cmd_ctx = {}; |
917a718d JG |
2228 | |
2229 | DBG("[thread] Manage client started"); | |
2230 | ||
3a91de3a JG |
2231 | lttng_payload_init(&cmd_ctx.reply_payload); |
2232 | ||
917a718d JG |
2233 | is_root = (getuid() == 0); |
2234 | ||
6cb45e93 | 2235 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2236 | |
2237 | rcu_register_thread(); | |
2238 | ||
2239 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); | |
2240 | ||
2241 | health_code_update(); | |
2242 | ||
2243 | ret = lttcomm_listen_unix_sock(client_sock); | |
2244 | if (ret < 0) { | |
2245 | goto error_listen; | |
2246 | } | |
2247 | ||
2248 | /* | |
2249 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2250 | * more will be added to this poll set. | |
2251 | */ | |
2252 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2253 | if (ret < 0) { | |
2254 | goto error_create_poll; | |
2255 | } | |
2256 | ||
2257 | /* Add the application registration socket */ | |
2258 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2259 | if (ret < 0) { | |
2260 | goto error; | |
2261 | } | |
2262 | ||
2263 | /* Add thread quit pipe */ | |
2264 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2265 | if (ret < 0) { | |
2266 | goto error; | |
2267 | } | |
2268 | ||
6cb45e93 | 2269 | /* Set state as running. */ |
0d163d56 | 2270 | set_thread_status(true); |
6cb45e93 JG |
2271 | pthread_cleanup_pop(0); |
2272 | ||
917a718d JG |
2273 | /* This testpoint is after we signal readiness to the parent. */ |
2274 | if (testpoint(sessiond_thread_manage_clients)) { | |
2275 | goto error; | |
2276 | } | |
2277 | ||
2278 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2279 | goto error; | |
2280 | } | |
2281 | ||
2282 | health_code_update(); | |
2283 | ||
917a718d JG |
2284 | while (1) { |
2285 | const struct cmd_completion_handler *cmd_completion_handler; | |
2286 | ||
3a91de3a JG |
2287 | cmd_ctx.creds = (lttng_sock_cred) { |
2288 | .uid = UINT32_MAX, | |
2289 | .gid = UINT32_MAX, | |
2290 | }; | |
2291 | cmd_ctx.session = NULL; | |
fe489250 | 2292 | lttng_payload_clear(&cmd_ctx.reply_payload); |
e368fb43 | 2293 | cmd_ctx.lttng_msg_size = 0; |
3a91de3a | 2294 | |
917a718d JG |
2295 | DBG("Accepting client command ..."); |
2296 | ||
2297 | /* Inifinite blocking call, waiting for transmission */ | |
2298 | restart: | |
2299 | health_poll_entry(); | |
2300 | ret = lttng_poll_wait(&events, -1); | |
2301 | health_poll_exit(); | |
2302 | if (ret < 0) { | |
2303 | /* | |
2304 | * Restart interrupted system call. | |
2305 | */ | |
2306 | if (errno == EINTR) { | |
2307 | goto restart; | |
2308 | } | |
2309 | goto error; | |
2310 | } | |
2311 | ||
2312 | nb_fd = ret; | |
2313 | ||
2314 | for (i = 0; i < nb_fd; i++) { | |
2315 | revents = LTTNG_POLL_GETEV(&events, i); | |
2316 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2317 | ||
2318 | health_code_update(); | |
2319 | ||
917a718d JG |
2320 | if (pollfd == thread_quit_pipe_fd) { |
2321 | err = 0; | |
2322 | goto exit; | |
2323 | } else { | |
2324 | /* Event on the registration socket */ | |
2325 | if (revents & LPOLLIN) { | |
2326 | continue; | |
2327 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2328 | ERR("Client socket poll error"); | |
2329 | goto error; | |
2330 | } else { | |
2331 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2332 | goto error; | |
2333 | } | |
2334 | } | |
2335 | } | |
2336 | ||
2337 | DBG("Wait for client response"); | |
2338 | ||
2339 | health_code_update(); | |
2340 | ||
2341 | sock = lttcomm_accept_unix_sock(client_sock); | |
2342 | if (sock < 0) { | |
2343 | goto error; | |
2344 | } | |
2345 | ||
2346 | /* | |
2347 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2348 | * show must go on. | |
2349 | */ | |
2350 | (void) utils_set_fd_cloexec(sock); | |
2351 | ||
2352 | /* Set socket option for credentials retrieval */ | |
2353 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2354 | if (ret < 0) { | |
2355 | goto error; | |
2356 | } | |
2357 | ||
917a718d JG |
2358 | health_code_update(); |
2359 | ||
2360 | /* | |
2361 | * Data is received from the lttng client. The struct | |
2362 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2363 | * the client. | |
2364 | */ | |
2365 | DBG("Receiving data from client ..."); | |
3a91de3a JG |
2366 | ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm, |
2367 | sizeof(struct lttcomm_session_msg), &cmd_ctx.creds); | |
2368 | if (ret != sizeof(struct lttcomm_session_msg)) { | |
2369 | DBG("Incomplete recv() from client... continuing"); | |
917a718d JG |
2370 | ret = close(sock); |
2371 | if (ret) { | |
2372 | PERROR("close"); | |
2373 | } | |
2374 | sock = -1; | |
917a718d JG |
2375 | continue; |
2376 | } | |
2377 | ||
2378 | health_code_update(); | |
2379 | ||
2380 | // TODO: Validate cmd_ctx including sanity check for | |
2381 | // security purpose. | |
2382 | ||
2383 | rcu_thread_online(); | |
2384 | /* | |
2385 | * This function dispatch the work to the kernel or userspace tracer | |
2386 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2387 | * informations for the client. The command context struct contains | |
2388 | * everything this function may needs. | |
2389 | */ | |
3a91de3a | 2390 | ret = process_client_msg(&cmd_ctx, &sock, &sock_error); |
917a718d JG |
2391 | rcu_thread_offline(); |
2392 | if (ret < 0) { | |
3e3665b8 JG |
2393 | if (sock >= 0) { |
2394 | ret = close(sock); | |
2395 | if (ret) { | |
2396 | PERROR("close"); | |
2397 | } | |
4a76dfd3 JR |
2398 | } |
2399 | sock = -1; | |
917a718d JG |
2400 | /* |
2401 | * TODO: Inform client somehow of the fatal error. At | |
2402 | * this point, ret < 0 means that a zmalloc failed | |
2403 | * (ENOMEM). Error detected but still accept | |
2404 | * command, unless a socket error has been | |
2405 | * detected. | |
2406 | */ | |
917a718d JG |
2407 | continue; |
2408 | } | |
2409 | ||
2410 | cmd_completion_handler = cmd_pop_completion_handler(); | |
2411 | if (cmd_completion_handler) { | |
2412 | enum lttng_error_code completion_code; | |
2413 | ||
2414 | completion_code = cmd_completion_handler->run( | |
2415 | cmd_completion_handler->data); | |
2416 | if (completion_code != LTTNG_OK) { | |
917a718d JG |
2417 | continue; |
2418 | } | |
2419 | } | |
2420 | ||
2421 | health_code_update(); | |
2422 | ||
3e3665b8 | 2423 | if (sock >= 0) { |
3a91de3a JG |
2424 | struct lttng_payload_view view = |
2425 | lttng_payload_view_from_payload( | |
2426 | &cmd_ctx.reply_payload, | |
2427 | 0, -1); | |
e368fb43 | 2428 | struct lttcomm_lttng_msg *llm = (typeof( |
3a91de3a JG |
2429 | llm)) cmd_ctx.reply_payload.buffer.data; |
2430 | ||
2431 | assert(cmd_ctx.reply_payload.buffer.size >= | |
2432 | sizeof(llm)); | |
2433 | assert(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size); | |
2434 | ||
fe489250 | 2435 | llm->fd_count = lttng_payload_view_get_fd_handle_count(&view); |
e368fb43 | 2436 | |
3e3665b8 | 2437 | DBG("Sending response (size: %d, retcode: %s (%d))", |
3a91de3a JG |
2438 | cmd_ctx.lttng_msg_size, |
2439 | lttng_strerror(-llm->ret_code), | |
2440 | llm->ret_code); | |
2441 | ret = send_unix_sock(sock, &view); | |
3e3665b8 JG |
2442 | if (ret < 0) { |
2443 | ERR("Failed to send data back to client"); | |
2444 | } | |
917a718d | 2445 | |
3e3665b8 JG |
2446 | /* End of transmission */ |
2447 | ret = close(sock); | |
2448 | if (ret) { | |
2449 | PERROR("close"); | |
2450 | } | |
4a76dfd3 JR |
2451 | } |
2452 | sock = -1; | |
917a718d | 2453 | |
917a718d JG |
2454 | health_code_update(); |
2455 | } | |
2456 | ||
2457 | exit: | |
2458 | error: | |
2459 | if (sock >= 0) { | |
2460 | ret = close(sock); | |
2461 | if (ret) { | |
2462 | PERROR("close"); | |
2463 | } | |
2464 | } | |
2465 | ||
2466 | lttng_poll_clean(&events); | |
917a718d JG |
2467 | |
2468 | error_listen: | |
2469 | error_create_poll: | |
2470 | unlink(config.client_unix_sock_path.value); | |
0f68efb6 JG |
2471 | ret = close(client_sock); |
2472 | if (ret) { | |
2473 | PERROR("close"); | |
917a718d JG |
2474 | } |
2475 | ||
2476 | if (err) { | |
2477 | health_error(); | |
2478 | ERR("Health error occurred in %s", __func__); | |
2479 | } | |
2480 | ||
2481 | health_unregister(health_sessiond); | |
2482 | ||
2483 | DBG("Client thread dying"); | |
3a91de3a | 2484 | lttng_payload_reset(&cmd_ctx.reply_payload); |
917a718d | 2485 | rcu_unregister_thread(); |
917a718d JG |
2486 | return NULL; |
2487 | } | |
2488 | ||
2489 | static | |
2490 | bool shutdown_client_thread(void *thread_data) | |
2491 | { | |
2492 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2493 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2494 | ||
2495 | return notify_thread_pipe(write_fd) == 1; | |
2496 | } | |
2497 | ||
2498 | struct lttng_thread *launch_client_thread(void) | |
2499 | { | |
6cb45e93 | 2500 | bool thread_running; |
917a718d | 2501 | struct lttng_pipe *client_quit_pipe; |
0f68efb6 JG |
2502 | struct lttng_thread *thread = NULL; |
2503 | int client_sock_fd = -1; | |
917a718d | 2504 | |
6cb45e93 | 2505 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2506 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2507 | if (!client_quit_pipe) { | |
2508 | goto error; | |
2509 | } | |
2510 | ||
0f68efb6 JG |
2511 | client_sock_fd = create_client_sock(); |
2512 | if (client_sock_fd < 0) { | |
2513 | goto error; | |
2514 | } | |
2515 | ||
2516 | thread_state.client_sock = client_sock_fd; | |
917a718d JG |
2517 | thread = lttng_thread_create("Client management", |
2518 | thread_manage_clients, | |
2519 | shutdown_client_thread, | |
2520 | cleanup_client_thread, | |
2521 | client_quit_pipe); | |
2522 | if (!thread) { | |
2523 | goto error; | |
2524 | } | |
0f68efb6 JG |
2525 | /* The client thread now owns the client sock fd and the quit pipe. */ |
2526 | client_sock_fd = -1; | |
2527 | client_quit_pipe = NULL; | |
917a718d JG |
2528 | |
2529 | /* | |
2530 | * This thread is part of the threads that need to be fully | |
2531 | * initialized before the session daemon is marked as "ready". | |
2532 | */ | |
6cb45e93 JG |
2533 | thread_running = wait_thread_status(); |
2534 | if (!thread_running) { | |
0f68efb6 | 2535 | goto error; |
6cb45e93 | 2536 | } |
917a718d JG |
2537 | return thread; |
2538 | error: | |
0f68efb6 JG |
2539 | if (client_sock_fd >= 0) { |
2540 | if (close(client_sock_fd)) { | |
2541 | PERROR("Failed to close client socket"); | |
2542 | } | |
2543 | } | |
2544 | lttng_thread_put(thread); | |
917a718d JG |
2545 | cleanup_client_thread(client_quit_pipe); |
2546 | return NULL; | |
2547 | } |