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" |
3a91de3a | 12 | #include "common/dynamic-array.h" |
588c4b0d | 13 | #include "common/dynamic-buffer.h" |
fe489250 | 14 | #include "common/fd-handle.h" |
e368fb43 | 15 | #include "common/payload-view.h" |
588c4b0d JG |
16 | #include "common/payload.h" |
17 | #include "common/sessiond-comm/sessiond-comm.h" | |
159b042f JG |
18 | #include "lttng/lttng-error.h" |
19 | #include "lttng/tracker.h" | |
917a718d | 20 | #include <common/compat/getenv.h> |
159b042f | 21 | #include <common/tracker.h> |
917a718d JG |
22 | #include <common/unix.h> |
23 | #include <common/utils.h> | |
588c4b0d | 24 | #include <lttng/error-query-internal.h> |
917a718d | 25 | #include <lttng/event-internal.h> |
b178f53e | 26 | #include <lttng/session-descriptor-internal.h> |
159b042f JG |
27 | #include <lttng/session-internal.h> |
28 | #include <lttng/userspace-probe-internal.h> | |
29 | #include <pthread.h> | |
30 | #include <signal.h> | |
31 | #include <stddef.h> | |
32 | #include <sys/stat.h> | |
1434fd36 | 33 | #include <unistd.h> |
917a718d | 34 | |
588c4b0d JG |
35 | #include "agent-thread.h" |
36 | #include "clear.h" | |
917a718d | 37 | #include "client.h" |
917a718d | 38 | #include "cmd.h" |
588c4b0d | 39 | #include "health-sessiond.h" |
917a718d | 40 | #include "kernel.h" |
588c4b0d JG |
41 | #include "lttng-sessiond.h" |
42 | #include "manage-consumer.h" | |
917a718d | 43 | #include "save.h" |
917a718d JG |
44 | #include "testpoint.h" |
45 | #include "utils.h" | |
46 | ||
47 | static bool is_root; | |
48 | ||
49 | static struct thread_state { | |
6cb45e93 JG |
50 | sem_t ready; |
51 | bool running; | |
0f68efb6 | 52 | int client_sock; |
6cb45e93 JG |
53 | } thread_state; |
54 | ||
55 | static void set_thread_status(bool running) | |
917a718d | 56 | { |
6cb45e93 JG |
57 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
58 | thread_state.running = running; | |
59 | sem_post(&thread_state.ready); | |
917a718d JG |
60 | } |
61 | ||
6cb45e93 | 62 | static bool wait_thread_status(void) |
917a718d | 63 | { |
6cb45e93 JG |
64 | DBG("Waiting for client thread to be ready"); |
65 | sem_wait(&thread_state.ready); | |
66 | if (thread_state.running) { | |
67 | DBG("Client thread is ready"); | |
68 | } else { | |
69 | ERR("Initialization of client thread failed"); | |
917a718d | 70 | } |
6cb45e93 JG |
71 | |
72 | return thread_state.running; | |
917a718d JG |
73 | } |
74 | ||
75 | /* | |
76 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
77 | * right amount of memory and copying the original information from the lsm | |
78 | * structure. | |
79 | * | |
80 | * Return 0 on success, negative value on error. | |
81 | */ | |
82 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
83 | const void *payload_buf, size_t payload_len, | |
84 | const void *cmd_header_buf, size_t cmd_header_len) | |
85 | { | |
86 | int ret = 0; | |
87 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
917a718d | 88 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; |
3a91de3a JG |
89 | const struct lttcomm_lttng_msg llm = { |
90 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
91 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
92 | .cmd_header_size = cmd_header_len, | |
93 | .data_size = payload_len, | |
94 | }; | |
917a718d | 95 | |
2eb1b01f JR |
96 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
97 | if (ret) { | |
98 | goto end; | |
99 | } | |
100 | ||
fe489250 | 101 | lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles); |
917a718d | 102 | |
3a91de3a JG |
103 | cmd_ctx->lttng_msg_size = total_msg_size; |
104 | ||
105 | /* Append reply header. */ | |
106 | ret = lttng_dynamic_buffer_append( | |
107 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
108 | if (ret) { | |
917a718d JG |
109 | goto end; |
110 | } | |
111 | ||
3a91de3a | 112 | /* Append command header. */ |
917a718d | 113 | if (cmd_header_len) { |
3a91de3a JG |
114 | ret = lttng_dynamic_buffer_append( |
115 | &cmd_ctx->reply_payload.buffer, cmd_header_buf, | |
116 | cmd_header_len); | |
117 | if (ret) { | |
118 | goto end; | |
119 | } | |
917a718d JG |
120 | } |
121 | ||
3a91de3a | 122 | /* Append payload. */ |
917a718d | 123 | if (payload_len) { |
3a91de3a JG |
124 | ret = lttng_dynamic_buffer_append( |
125 | &cmd_ctx->reply_payload.buffer, payload_buf, | |
126 | payload_len); | |
127 | if (ret) { | |
128 | goto end; | |
129 | } | |
917a718d JG |
130 | } |
131 | ||
132 | end: | |
133 | return ret; | |
134 | } | |
135 | ||
e368fb43 JG |
136 | static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx) |
137 | { | |
138 | int ret; | |
139 | const struct lttcomm_lttng_msg llm = {}; | |
140 | ||
64defc29 JR |
141 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
142 | if (ret) { | |
143 | goto end; | |
144 | } | |
e368fb43 JG |
145 | |
146 | /* Append place-holder reply header. */ | |
147 | ret = lttng_dynamic_buffer_append( | |
148 | &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); | |
149 | if (ret) { | |
150 | goto end; | |
151 | } | |
152 | ||
153 | cmd_ctx->lttng_msg_size = sizeof(llm); | |
154 | end: | |
155 | return ret; | |
156 | } | |
157 | ||
158 | static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len, | |
159 | size_t payload_len) | |
160 | { | |
161 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
162 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
163 | const struct lttcomm_lttng_msg llm = { | |
164 | .cmd_type = cmd_ctx->lsm.cmd_type, | |
165 | .pid = cmd_ctx->lsm.domain.attr.pid, | |
166 | .cmd_header_size = cmd_header_len, | |
167 | .data_size = payload_len, | |
168 | }; | |
169 | struct lttcomm_lttng_msg *p_llm; | |
170 | ||
171 | assert(cmd_ctx->reply_payload.buffer.size >= sizeof(llm)); | |
172 | ||
173 | p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data; | |
174 | ||
175 | /* Update existing header. */ | |
176 | memcpy(p_llm, &llm, sizeof(llm)); | |
177 | ||
178 | cmd_ctx->lttng_msg_size = total_msg_size; | |
179 | } | |
180 | ||
917a718d JG |
181 | /* |
182 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 183 | * exec or it will fail. |
917a718d JG |
184 | */ |
185 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
186 | { | |
4ec029ed | 187 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
188 | } |
189 | ||
190 | /* | |
191 | * Fork and exec a consumer daemon (consumerd). | |
192 | * | |
193 | * Return pid if successful else -1. | |
194 | */ | |
195 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
196 | { | |
197 | int ret; | |
198 | pid_t pid; | |
199 | const char *consumer_to_use; | |
200 | const char *verbosity; | |
201 | struct stat st; | |
202 | ||
203 | DBG("Spawning consumerd"); | |
204 | ||
205 | pid = fork(); | |
206 | if (pid == 0) { | |
207 | /* | |
208 | * Exec consumerd. | |
209 | */ | |
412d7227 | 210 | if (the_config.verbose_consumer) { |
917a718d JG |
211 | verbosity = "--verbose"; |
212 | } else if (lttng_opt_quiet) { | |
213 | verbosity = "--quiet"; | |
214 | } else { | |
215 | verbosity = ""; | |
216 | } | |
217 | ||
218 | switch (consumer_data->type) { | |
219 | case LTTNG_CONSUMER_KERNEL: | |
220 | /* | |
221 | * Find out which consumerd to execute. We will first try the | |
222 | * 64-bit path, then the sessiond's installation directory, and | |
223 | * fallback on the 32-bit one, | |
224 | */ | |
225 | DBG3("Looking for a kernel consumer at these locations:"); | |
412d7227 | 226 | DBG3(" 1) %s", the_config.consumerd64_bin_path.value ? : "NULL"); |
917a718d | 227 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
412d7227 SM |
228 | DBG3(" 3) %s", the_config.consumerd32_bin_path.value ? : "NULL"); |
229 | if (stat(the_config.consumerd64_bin_path.value, &st) == 0) { | |
917a718d | 230 | DBG3("Found location #1"); |
412d7227 | 231 | consumer_to_use = the_config.consumerd64_bin_path.value; |
917a718d JG |
232 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { |
233 | DBG3("Found location #2"); | |
234 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
412d7227 SM |
235 | } else if (the_config.consumerd32_bin_path.value && |
236 | stat(the_config.consumerd32_bin_path.value, &st) == 0) { | |
917a718d | 237 | DBG3("Found location #3"); |
412d7227 | 238 | consumer_to_use = the_config.consumerd32_bin_path.value; |
917a718d JG |
239 | } else { |
240 | DBG("Could not find any valid consumerd executable"); | |
241 | ret = -EINVAL; | |
242 | goto error; | |
243 | } | |
244 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
412d7227 SM |
245 | (void) execl(consumer_to_use, "lttng-consumerd", |
246 | verbosity, "-k", "--consumerd-cmd-sock", | |
247 | consumer_data->cmd_unix_sock_path, | |
248 | "--consumerd-err-sock", | |
249 | consumer_data->err_unix_sock_path, | |
250 | "--group", | |
251 | the_config.tracing_group_name.value, | |
252 | NULL); | |
917a718d JG |
253 | break; |
254 | case LTTNG_CONSUMER64_UST: | |
255 | { | |
412d7227 | 256 | if (the_config.consumerd64_lib_dir.value) { |
b53d4e59 | 257 | const char *tmp; |
917a718d JG |
258 | size_t tmplen; |
259 | char *tmpnew; | |
260 | ||
261 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
262 | if (!tmp) { | |
263 | tmp = ""; | |
264 | } | |
412d7227 | 265 | tmplen = strlen(the_config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
917a718d JG |
266 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
267 | if (!tmpnew) { | |
268 | ret = -ENOMEM; | |
269 | goto error; | |
270 | } | |
412d7227 | 271 | strcat(tmpnew, the_config.consumerd64_lib_dir.value); |
917a718d JG |
272 | if (tmp[0] != '\0') { |
273 | strcat(tmpnew, ":"); | |
274 | strcat(tmpnew, tmp); | |
275 | } | |
276 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
277 | free(tmpnew); | |
278 | if (ret) { | |
279 | ret = -errno; | |
280 | goto error; | |
281 | } | |
282 | } | |
412d7227 SM |
283 | DBG("Using 64-bit UST consumer at: %s", |
284 | the_config.consumerd64_bin_path.value); | |
285 | (void) execl(the_config.consumerd64_bin_path.value, | |
286 | "lttng-consumerd", verbosity, "-u", | |
287 | "--consumerd-cmd-sock", | |
288 | consumer_data->cmd_unix_sock_path, | |
289 | "--consumerd-err-sock", | |
290 | consumer_data->err_unix_sock_path, | |
291 | "--group", | |
292 | the_config.tracing_group_name.value, | |
917a718d JG |
293 | NULL); |
294 | break; | |
295 | } | |
296 | case LTTNG_CONSUMER32_UST: | |
297 | { | |
412d7227 | 298 | if (the_config.consumerd32_lib_dir.value) { |
b53d4e59 | 299 | const char *tmp; |
917a718d JG |
300 | size_t tmplen; |
301 | char *tmpnew; | |
302 | ||
303 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
304 | if (!tmp) { | |
305 | tmp = ""; | |
306 | } | |
412d7227 | 307 | tmplen = strlen(the_config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
917a718d JG |
308 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
309 | if (!tmpnew) { | |
310 | ret = -ENOMEM; | |
311 | goto error; | |
312 | } | |
412d7227 | 313 | strcat(tmpnew, the_config.consumerd32_lib_dir.value); |
917a718d JG |
314 | if (tmp[0] != '\0') { |
315 | strcat(tmpnew, ":"); | |
316 | strcat(tmpnew, tmp); | |
317 | } | |
318 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
319 | free(tmpnew); | |
320 | if (ret) { | |
321 | ret = -errno; | |
322 | goto error; | |
323 | } | |
324 | } | |
412d7227 SM |
325 | DBG("Using 32-bit UST consumer at: %s", |
326 | the_config.consumerd32_bin_path.value); | |
327 | (void) execl(the_config.consumerd32_bin_path.value, | |
328 | "lttng-consumerd", verbosity, "-u", | |
329 | "--consumerd-cmd-sock", | |
330 | consumer_data->cmd_unix_sock_path, | |
331 | "--consumerd-err-sock", | |
332 | consumer_data->err_unix_sock_path, | |
333 | "--group", | |
334 | the_config.tracing_group_name.value, | |
917a718d JG |
335 | NULL); |
336 | break; | |
337 | } | |
338 | default: | |
339 | ERR("unknown consumer type"); | |
340 | errno = 0; | |
341 | } | |
342 | if (errno != 0) { | |
343 | PERROR("Consumer execl()"); | |
344 | } | |
345 | /* Reaching this point, we got a failure on our execl(). */ | |
346 | exit(EXIT_FAILURE); | |
347 | } else if (pid > 0) { | |
348 | ret = pid; | |
349 | } else { | |
350 | PERROR("start consumer fork"); | |
351 | ret = -errno; | |
352 | } | |
353 | error: | |
354 | return ret; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Spawn the consumerd daemon and session daemon thread. | |
359 | */ | |
360 | static int start_consumerd(struct consumer_data *consumer_data) | |
361 | { | |
362 | int ret; | |
363 | ||
364 | /* | |
365 | * Set the listen() state on the socket since there is a possible race | |
366 | * between the exec() of the consumer daemon and this call if place in the | |
367 | * consumer thread. See bug #366 for more details. | |
368 | */ | |
369 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
370 | if (ret < 0) { | |
371 | goto error; | |
372 | } | |
373 | ||
374 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
375 | if (consumer_data->pid != 0) { | |
376 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
377 | goto end; | |
378 | } | |
379 | ||
380 | ret = spawn_consumerd(consumer_data); | |
381 | if (ret < 0) { | |
382 | ERR("Spawning consumerd failed"); | |
383 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
384 | goto error; | |
385 | } | |
386 | ||
387 | /* Setting up the consumer_data pid */ | |
388 | consumer_data->pid = ret; | |
389 | DBG2("Consumer pid %d", consumer_data->pid); | |
390 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
391 | ||
392 | DBG2("Spawning consumer control thread"); | |
393 | ret = spawn_consumer_thread(consumer_data); | |
394 | if (ret < 0) { | |
395 | ERR("Fatal error spawning consumer control thread"); | |
396 | goto error; | |
397 | } | |
398 | ||
399 | end: | |
400 | return 0; | |
401 | ||
402 | error: | |
403 | /* Cleanup already created sockets on error. */ | |
404 | if (consumer_data->err_sock >= 0) { | |
405 | int err; | |
406 | ||
407 | err = close(consumer_data->err_sock); | |
408 | if (err < 0) { | |
409 | PERROR("close consumer data error socket"); | |
410 | } | |
411 | } | |
412 | return ret; | |
413 | } | |
414 | ||
415 | /* | |
416 | * Copy consumer output from the tracing session to the domain session. The | |
417 | * function also applies the right modification on a per domain basis for the | |
418 | * trace files destination directory. | |
419 | * | |
420 | * Should *NOT* be called with RCU read-side lock held. | |
421 | */ | |
422 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
423 | { | |
424 | int ret; | |
425 | const char *dir_name; | |
426 | struct consumer_output *consumer; | |
427 | ||
428 | assert(session); | |
429 | assert(session->consumer); | |
430 | ||
431 | switch (domain) { | |
432 | case LTTNG_DOMAIN_KERNEL: | |
433 | DBG3("Copying tracing session consumer output in kernel session"); | |
434 | /* | |
435 | * XXX: We should audit the session creation and what this function | |
436 | * does "extra" in order to avoid a destroy since this function is used | |
437 | * in the domain session creation (kernel and ust) only. Same for UST | |
438 | * domain. | |
439 | */ | |
440 | if (session->kernel_session->consumer) { | |
441 | consumer_output_put(session->kernel_session->consumer); | |
442 | } | |
443 | session->kernel_session->consumer = | |
444 | consumer_copy_output(session->consumer); | |
445 | /* Ease our life a bit for the next part */ | |
446 | consumer = session->kernel_session->consumer; | |
447 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
448 | break; | |
449 | case LTTNG_DOMAIN_JUL: | |
450 | case LTTNG_DOMAIN_LOG4J: | |
451 | case LTTNG_DOMAIN_PYTHON: | |
452 | case LTTNG_DOMAIN_UST: | |
453 | DBG3("Copying tracing session consumer output in UST session"); | |
454 | if (session->ust_session->consumer) { | |
455 | consumer_output_put(session->ust_session->consumer); | |
456 | } | |
457 | session->ust_session->consumer = | |
458 | consumer_copy_output(session->consumer); | |
459 | /* Ease our life a bit for the next part */ | |
460 | consumer = session->ust_session->consumer; | |
461 | dir_name = DEFAULT_UST_TRACE_DIR; | |
462 | break; | |
463 | default: | |
464 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
465 | goto error; | |
466 | } | |
467 | ||
468 | /* Append correct directory to subdir */ | |
b178f53e JG |
469 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
470 | sizeof(consumer->domain_subdir)); | |
471 | if (ret) { | |
472 | ret = LTTNG_ERR_UNK; | |
473 | goto error; | |
474 | } | |
475 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
476 | ret = LTTNG_OK; |
477 | ||
478 | error: | |
479 | return ret; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Create an UST session and add it to the session ust list. | |
484 | * | |
485 | * Should *NOT* be called with RCU read-side lock held. | |
486 | */ | |
487 | static int create_ust_session(struct ltt_session *session, | |
df4f5a87 | 488 | const struct lttng_domain *domain) |
917a718d JG |
489 | { |
490 | int ret; | |
491 | struct ltt_ust_session *lus = NULL; | |
492 | ||
493 | assert(session); | |
494 | assert(domain); | |
495 | assert(session->consumer); | |
496 | ||
497 | switch (domain->type) { | |
498 | case LTTNG_DOMAIN_JUL: | |
499 | case LTTNG_DOMAIN_LOG4J: | |
500 | case LTTNG_DOMAIN_PYTHON: | |
501 | case LTTNG_DOMAIN_UST: | |
502 | break; | |
503 | default: | |
504 | ERR("Unknown UST domain on create session %d", domain->type); | |
505 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
506 | goto error; | |
507 | } | |
508 | ||
509 | DBG("Creating UST session"); | |
510 | ||
511 | lus = trace_ust_create_session(session->id); | |
512 | if (lus == NULL) { | |
513 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
514 | goto error; | |
515 | } | |
516 | ||
517 | lus->uid = session->uid; | |
518 | lus->gid = session->gid; | |
519 | lus->output_traces = session->output_traces; | |
520 | lus->snapshot_mode = session->snapshot_mode; | |
521 | lus->live_timer_interval = session->live_timer; | |
522 | session->ust_session = lus; | |
523 | if (session->shm_path[0]) { | |
524 | strncpy(lus->root_shm_path, session->shm_path, | |
525 | sizeof(lus->root_shm_path)); | |
526 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
527 | strncpy(lus->shm_path, session->shm_path, | |
528 | sizeof(lus->shm_path)); | |
529 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
530 | strncat(lus->shm_path, "/ust", | |
531 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
532 | } | |
533 | /* Copy session output to the newly created UST session */ | |
534 | ret = copy_session_consumer(domain->type, session); | |
535 | if (ret != LTTNG_OK) { | |
536 | goto error; | |
537 | } | |
538 | ||
539 | return LTTNG_OK; | |
540 | ||
541 | error: | |
542 | free(lus); | |
543 | session->ust_session = NULL; | |
544 | return ret; | |
545 | } | |
546 | ||
547 | /* | |
548 | * Create a kernel tracer session then create the default channel. | |
549 | */ | |
550 | static int create_kernel_session(struct ltt_session *session) | |
551 | { | |
552 | int ret; | |
553 | ||
554 | DBG("Creating kernel session"); | |
555 | ||
7d268848 | 556 | ret = kernel_create_session(session); |
917a718d JG |
557 | if (ret < 0) { |
558 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 559 | goto error_create; |
917a718d JG |
560 | } |
561 | ||
562 | /* Code flow safety */ | |
563 | assert(session->kernel_session); | |
564 | ||
565 | /* Copy session output to the newly created Kernel session */ | |
566 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
567 | if (ret != LTTNG_OK) { | |
568 | goto error; | |
569 | } | |
570 | ||
571 | session->kernel_session->uid = session->uid; | |
572 | session->kernel_session->gid = session->gid; | |
573 | session->kernel_session->output_traces = session->output_traces; | |
574 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
a2814ea7 | 575 | session->kernel_session->is_live_session = session->live_timer != 0; |
917a718d JG |
576 | |
577 | return LTTNG_OK; | |
578 | ||
579 | error: | |
580 | trace_kernel_destroy_session(session->kernel_session); | |
581 | session->kernel_session = NULL; | |
5d0a7bcb | 582 | error_create: |
917a718d JG |
583 | return ret; |
584 | } | |
585 | ||
586 | /* | |
587 | * Count number of session permitted by uid/gid. | |
588 | */ | |
589 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
590 | { | |
591 | unsigned int i = 0; | |
592 | struct ltt_session *session; | |
593 | const struct ltt_session_list *session_list = session_get_list(); | |
594 | ||
d7b377ed | 595 | DBG("Counting number of available session for UID %d", uid); |
917a718d JG |
596 | cds_list_for_each_entry(session, &session_list->head, list) { |
597 | if (!session_get(session)) { | |
598 | continue; | |
599 | } | |
600 | session_lock(session); | |
601 | /* Only count the sessions the user can control. */ | |
d7b377ed | 602 | if (session_access_ok(session, uid) && |
917a718d JG |
603 | !session->destroyed) { |
604 | i++; | |
605 | } | |
606 | session_unlock(session); | |
607 | session_put(session); | |
608 | } | |
609 | return i; | |
610 | } | |
611 | ||
612 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
613 | int *sock_error, struct lttng_event *event) | |
614 | { | |
fe489250 | 615 | int fd = -1, ret; |
917a718d | 616 | struct lttng_userspace_probe_location *probe_location; |
e368fb43 | 617 | struct lttng_payload probe_location_payload; |
fe489250 | 618 | struct fd_handle *handle = NULL; |
917a718d JG |
619 | |
620 | /* | |
e368fb43 | 621 | * Create a payload to store the serialized version of the probe |
917a718d JG |
622 | * location. |
623 | */ | |
e368fb43 JG |
624 | lttng_payload_init(&probe_location_payload); |
625 | ||
626 | ret = lttng_dynamic_buffer_set_size(&probe_location_payload.buffer, | |
3a91de3a | 627 | cmd_ctx->lsm.u.enable.userspace_probe_location_len); |
917a718d JG |
628 | if (ret) { |
629 | ret = LTTNG_ERR_NOMEM; | |
630 | goto error; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Receive the probe location. | |
635 | */ | |
e368fb43 JG |
636 | ret = lttcomm_recv_unix_sock(sock, probe_location_payload.buffer.data, |
637 | probe_location_payload.buffer.size); | |
917a718d JG |
638 | if (ret <= 0) { |
639 | DBG("Nothing recv() from client var len data... continuing"); | |
640 | *sock_error = 1; | |
917a718d JG |
641 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
642 | goto error; | |
643 | } | |
644 | ||
645 | /* | |
646 | * Receive the file descriptor to the target binary from the client. | |
647 | */ | |
648 | DBG("Receiving userspace probe target FD from client ..."); | |
649 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
650 | if (ret <= 0) { | |
651 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
652 | *sock_error = 1; | |
653 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
654 | goto error; | |
655 | } | |
656 | ||
fe489250 JG |
657 | handle = fd_handle_create(fd); |
658 | if (!handle) { | |
659 | ret = LTTNG_ERR_NOMEM; | |
660 | goto error; | |
661 | } | |
662 | ||
663 | /* Transferred to the handle. */ | |
664 | fd = -1; | |
665 | ||
666 | ret = lttng_payload_push_fd_handle(&probe_location_payload, handle); | |
e368fb43 JG |
667 | if (ret) { |
668 | ERR("Failed to add userspace probe file descriptor to payload"); | |
669 | ret = LTTNG_ERR_NOMEM; | |
917a718d JG |
670 | goto error; |
671 | } | |
672 | ||
fe489250 JG |
673 | fd_handle_put(handle); |
674 | handle = NULL; | |
675 | ||
e368fb43 JG |
676 | { |
677 | struct lttng_payload_view view = lttng_payload_view_from_payload( | |
678 | &probe_location_payload, 0, -1); | |
917a718d | 679 | |
e368fb43 JG |
680 | /* Extract the probe location from the serialized version. */ |
681 | ret = lttng_userspace_probe_location_create_from_payload( | |
682 | &view, &probe_location); | |
683 | } | |
684 | if (ret < 0) { | |
685 | WARN("Failed to create a userspace probe location from the received buffer"); | |
917a718d JG |
686 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
687 | goto error; | |
688 | } | |
689 | ||
690 | /* Attach the probe location to the event. */ | |
691 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
692 | if (ret) { | |
693 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
694 | goto error; | |
695 | } | |
696 | ||
917a718d | 697 | error: |
fe489250 JG |
698 | if (fd >= 0) { |
699 | if (close(fd)) { | |
700 | PERROR("Failed to close userspace probe location binary fd"); | |
701 | } | |
702 | } | |
703 | ||
704 | fd_handle_put(handle); | |
e368fb43 | 705 | lttng_payload_reset(&probe_location_payload); |
917a718d JG |
706 | return ret; |
707 | } | |
708 | ||
746e08d7 JG |
709 | static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx, |
710 | int sock, | |
711 | int *sock_error, | |
712 | struct lttng_trigger **_trigger) | |
713 | { | |
714 | int ret; | |
715 | size_t trigger_len; | |
716 | ssize_t sock_recv_len; | |
717 | enum lttng_error_code ret_code; | |
718 | struct lttng_payload trigger_payload; | |
b5ef1685 | 719 | struct lttng_trigger *trigger = NULL; |
746e08d7 JG |
720 | |
721 | lttng_payload_init(&trigger_payload); | |
722 | trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length; | |
723 | ret = lttng_dynamic_buffer_set_size( | |
724 | &trigger_payload.buffer, trigger_len); | |
725 | if (ret) { | |
726 | ret_code = LTTNG_ERR_NOMEM; | |
727 | goto end; | |
728 | } | |
729 | ||
730 | sock_recv_len = lttcomm_recv_unix_sock( | |
731 | sock, trigger_payload.buffer.data, trigger_len); | |
732 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { | |
733 | ERR("Failed to receive trigger in command payload"); | |
734 | *sock_error = 1; | |
735 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
736 | goto end; | |
737 | } | |
738 | ||
739 | /* Receive fds, if any. */ | |
740 | if (cmd_ctx->lsm.fd_count > 0) { | |
741 | sock_recv_len = lttcomm_recv_payload_fds_unix_sock( | |
742 | sock, cmd_ctx->lsm.fd_count, &trigger_payload); | |
743 | if (sock_recv_len > 0 && | |
744 | sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
745 | ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d", | |
746 | cmd_ctx->lsm.fd_count, (int) ret); | |
747 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
748 | *sock_error = 1; | |
749 | goto end; | |
750 | } else if (sock_recv_len <= 0) { | |
751 | ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d", | |
752 | cmd_ctx->lsm.fd_count, (int) ret); | |
753 | ret_code = LTTNG_ERR_FATAL; | |
754 | *sock_error = 1; | |
755 | goto end; | |
756 | } | |
757 | } | |
758 | ||
759 | /* Deserialize trigger. */ | |
760 | { | |
761 | struct lttng_payload_view view = | |
762 | lttng_payload_view_from_payload( | |
763 | &trigger_payload, 0, -1); | |
764 | ||
765 | if (lttng_trigger_create_from_payload(&view, &trigger) != | |
766 | trigger_len) { | |
767 | ERR("Invalid trigger received as part of command payload"); | |
768 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
b5ef1685 | 769 | lttng_trigger_put(trigger); |
746e08d7 JG |
770 | goto end; |
771 | } | |
772 | } | |
773 | ||
774 | *_trigger = trigger; | |
775 | ret_code = LTTNG_OK; | |
776 | ||
777 | end: | |
bae46a81 | 778 | lttng_payload_reset(&trigger_payload); |
746e08d7 JG |
779 | return ret_code; |
780 | } | |
781 | ||
588c4b0d JG |
782 | static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx, |
783 | int sock, | |
784 | int *sock_error, | |
785 | struct lttng_error_query **_query) | |
786 | { | |
787 | int ret; | |
788 | size_t query_len; | |
789 | ssize_t sock_recv_len; | |
790 | enum lttng_error_code ret_code; | |
791 | struct lttng_payload query_payload; | |
792 | struct lttng_error_query *query = NULL; | |
793 | ||
794 | lttng_payload_init(&query_payload); | |
795 | query_len = (size_t) cmd_ctx->lsm.u.error_query.length; | |
796 | ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len); | |
797 | if (ret) { | |
798 | ret_code = LTTNG_ERR_NOMEM; | |
799 | goto end; | |
800 | } | |
801 | ||
802 | sock_recv_len = lttcomm_recv_unix_sock( | |
803 | sock, query_payload.buffer.data, query_len); | |
804 | if (sock_recv_len < 0 || sock_recv_len != query_len) { | |
805 | ERR("Failed to receive error query in command payload"); | |
806 | *sock_error = 1; | |
807 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
808 | goto end; | |
809 | } | |
810 | ||
811 | /* Receive fds, if any. */ | |
812 | if (cmd_ctx->lsm.fd_count > 0) { | |
813 | sock_recv_len = lttcomm_recv_payload_fds_unix_sock( | |
814 | sock, cmd_ctx->lsm.fd_count, &query_payload); | |
815 | if (sock_recv_len > 0 && | |
816 | sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
817 | ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d", | |
818 | cmd_ctx->lsm.fd_count, (int) ret); | |
819 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
820 | *sock_error = 1; | |
821 | goto end; | |
822 | } else if (sock_recv_len <= 0) { | |
823 | ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d", | |
824 | cmd_ctx->lsm.fd_count, (int) ret); | |
825 | ret_code = LTTNG_ERR_FATAL; | |
826 | *sock_error = 1; | |
827 | goto end; | |
828 | } | |
829 | } | |
830 | ||
831 | /* Deserialize error query. */ | |
832 | { | |
833 | struct lttng_payload_view view = | |
834 | lttng_payload_view_from_payload( | |
835 | &query_payload, 0, -1); | |
836 | ||
837 | if (lttng_error_query_create_from_payload(&view, &query) != | |
838 | query_len) { | |
839 | ERR("Invalid error query received as part of command payload"); | |
840 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
841 | goto end; | |
842 | } | |
843 | } | |
844 | ||
845 | *_query = query; | |
846 | ret_code = LTTNG_OK; | |
847 | ||
848 | end: | |
849 | lttng_payload_reset(&query_payload); | |
850 | return ret_code; | |
851 | } | |
852 | ||
917a718d JG |
853 | /* |
854 | * Version of setup_lttng_msg() without command header. | |
855 | */ | |
856 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
857 | void *payload_buf, size_t payload_len) | |
858 | { | |
859 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
860 | } | |
861 | ||
917a718d JG |
862 | /* |
863 | * Check if the current kernel tracer supports the session rotation feature. | |
864 | * Return 1 if it does, 0 otherwise. | |
865 | */ | |
866 | static int check_rotate_compatible(void) | |
867 | { | |
868 | int ret = 1; | |
869 | ||
412d7227 SM |
870 | if (the_kernel_tracer_version.major != 2 || |
871 | the_kernel_tracer_version.minor < 11) { | |
917a718d JG |
872 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
873 | ret = 0; | |
874 | } | |
875 | ||
876 | return ret; | |
877 | } | |
878 | ||
879 | /* | |
880 | * Send data on a unix socket using the liblttsessiondcomm API. | |
881 | * | |
882 | * Return lttcomm error code. | |
883 | */ | |
3a91de3a | 884 | static int send_unix_sock(int sock, struct lttng_payload_view *view) |
917a718d | 885 | { |
3a91de3a | 886 | int ret; |
fe489250 | 887 | const int fd_count = lttng_payload_view_get_fd_handle_count(view); |
3a91de3a | 888 | |
917a718d | 889 | /* Check valid length */ |
3a91de3a JG |
890 | if (view->buffer.size == 0) { |
891 | ret = -1; | |
892 | goto end; | |
893 | } | |
894 | ||
895 | ret = lttcomm_send_unix_sock( | |
896 | sock, view->buffer.data, view->buffer.size); | |
897 | if (ret < 0) { | |
898 | goto end; | |
917a718d JG |
899 | } |
900 | ||
fe489250 | 901 | if (fd_count > 0) { |
700741dc JG |
902 | ret = lttcomm_send_payload_view_fds_unix_sock(sock, view); |
903 | if (ret < 0) { | |
904 | goto end; | |
fe489250 | 905 | } |
3a91de3a JG |
906 | } |
907 | ||
908 | end: | |
909 | return ret; | |
917a718d JG |
910 | } |
911 | ||
912 | /* | |
913 | * Process the command requested by the lttng client within the command | |
914 | * context structure. This function make sure that the return structure (llm) | |
915 | * is set and ready for transmission before returning. | |
916 | * | |
917 | * Return any error encountered or 0 for success. | |
918 | * | |
919 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
920 | * A command may assume the ownership of the socket, in which case its value |
921 | * should be set to -1. | |
917a718d JG |
922 | * |
923 | * Should *NOT* be called with RCU read-side lock held. | |
924 | */ | |
3e3665b8 | 925 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
917a718d JG |
926 | int *sock_error) |
927 | { | |
928 | int ret = LTTNG_OK; | |
9124c630 JR |
929 | bool need_tracing_session = true; |
930 | bool need_domain; | |
931 | bool need_consumerd; | |
917a718d | 932 | |
19f912db FD |
933 | DBG("Processing client command '%s\' (%d)", |
934 | lttcomm_sessiond_command_str(cmd_ctx->lsm.cmd_type), | |
935 | cmd_ctx->lsm.cmd_type); | |
917a718d JG |
936 | |
937 | assert(!rcu_read_ongoing()); | |
938 | ||
939 | *sock_error = 0; | |
940 | ||
3a91de3a | 941 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 942 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
943 | case LTTNG_DESTROY_SESSION: |
944 | case LTTNG_LIST_SESSIONS: | |
945 | case LTTNG_LIST_DOMAINS: | |
946 | case LTTNG_START_TRACE: | |
947 | case LTTNG_STOP_TRACE: | |
948 | case LTTNG_DATA_PENDING: | |
949 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
950 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
951 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
952 | case LTTNG_SNAPSHOT_RECORD: | |
953 | case LTTNG_SAVE_SESSION: | |
954 | case LTTNG_SET_SESSION_SHM_PATH: | |
955 | case LTTNG_REGENERATE_METADATA: | |
956 | case LTTNG_REGENERATE_STATEDUMP: | |
917a718d JG |
957 | case LTTNG_ROTATE_SESSION: |
958 | case LTTNG_ROTATION_GET_INFO: | |
959 | case LTTNG_ROTATION_SET_SCHEDULE: | |
960 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
022349df | 961 | case LTTNG_CLEAR_SESSION: |
fbc9f37d | 962 | case LTTNG_LIST_TRIGGERS: |
588c4b0d | 963 | case LTTNG_EXECUTE_ERROR_QUERY: |
9124c630 JR |
964 | need_domain = false; |
965 | break; | |
966 | default: | |
967 | need_domain = true; | |
968 | } | |
969 | ||
970 | /* Needs a functioning consumerd? */ | |
971 | switch (cmd_ctx->lsm.cmd_type) { | |
972 | case LTTNG_REGISTER_TRIGGER: | |
973 | case LTTNG_UNREGISTER_TRIGGER: | |
588c4b0d | 974 | case LTTNG_EXECUTE_ERROR_QUERY: |
9124c630 | 975 | need_consumerd = false; |
917a718d JG |
976 | break; |
977 | default: | |
9124c630 JR |
978 | need_consumerd = true; |
979 | break; | |
917a718d JG |
980 | } |
981 | ||
412d7227 SM |
982 | if (the_config.no_kernel && need_domain && |
983 | cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) { | |
917a718d JG |
984 | if (!is_root) { |
985 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
986 | } else { | |
987 | ret = LTTNG_ERR_KERN_NA; | |
988 | } | |
989 | goto error; | |
990 | } | |
991 | ||
992 | /* Deny register consumer if we already have a spawned consumer. */ | |
3a91de3a | 993 | if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) { |
412d7227 SM |
994 | pthread_mutex_lock(&the_kconsumer_data.pid_mutex); |
995 | if (the_kconsumer_data.pid > 0) { | |
917a718d | 996 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
412d7227 | 997 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
917a718d JG |
998 | goto error; |
999 | } | |
412d7227 | 1000 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
917a718d JG |
1001 | } |
1002 | ||
1003 | /* | |
1004 | * Check for command that don't needs to allocate a returned payload. We do | |
1005 | * this here so we don't have to make the call for no payload at each | |
1006 | * command. | |
1007 | */ | |
3a91de3a | 1008 | switch(cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1009 | case LTTNG_LIST_SESSIONS: |
1010 | case LTTNG_LIST_TRACEPOINTS: | |
1011 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1012 | case LTTNG_LIST_DOMAINS: | |
1013 | case LTTNG_LIST_CHANNELS: | |
1014 | case LTTNG_LIST_EVENTS: | |
1015 | case LTTNG_LIST_SYSCALLS: | |
159b042f JG |
1016 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
1017 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
1018 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
917a718d JG |
1019 | case LTTNG_DATA_PENDING: |
1020 | case LTTNG_ROTATE_SESSION: | |
1021 | case LTTNG_ROTATION_GET_INFO: | |
9124c630 | 1022 | case LTTNG_REGISTER_TRIGGER: |
fbc9f37d | 1023 | case LTTNG_LIST_TRIGGERS: |
588c4b0d | 1024 | case LTTNG_EXECUTE_ERROR_QUERY: |
917a718d JG |
1025 | break; |
1026 | default: | |
1027 | /* Setup lttng message with no payload */ | |
1028 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
1029 | if (ret < 0) { | |
1030 | /* This label does not try to unlock the session */ | |
1031 | goto init_setup_error; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | /* Commands that DO NOT need a session. */ | |
3a91de3a | 1036 | switch (cmd_ctx->lsm.cmd_type) { |
b178f53e | 1037 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
1038 | case LTTNG_LIST_SESSIONS: |
1039 | case LTTNG_LIST_TRACEPOINTS: | |
1040 | case LTTNG_LIST_SYSCALLS: | |
1041 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1042 | case LTTNG_SAVE_SESSION: | |
1043 | case LTTNG_REGISTER_TRIGGER: | |
1044 | case LTTNG_UNREGISTER_TRIGGER: | |
fbc9f37d | 1045 | case LTTNG_LIST_TRIGGERS: |
588c4b0d | 1046 | case LTTNG_EXECUTE_ERROR_QUERY: |
9124c630 | 1047 | need_tracing_session = false; |
917a718d JG |
1048 | break; |
1049 | default: | |
3a91de3a | 1050 | DBG("Getting session %s by name", cmd_ctx->lsm.session.name); |
917a718d JG |
1051 | /* |
1052 | * We keep the session list lock across _all_ commands | |
1053 | * for now, because the per-session lock does not | |
1054 | * handle teardown properly. | |
1055 | */ | |
1056 | session_lock_list(); | |
3a91de3a | 1057 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name); |
917a718d JG |
1058 | if (cmd_ctx->session == NULL) { |
1059 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
1060 | goto error; | |
1061 | } else { | |
1062 | /* Acquire lock for the session */ | |
1063 | session_lock(cmd_ctx->session); | |
1064 | } | |
1065 | break; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Commands that need a valid session but should NOT create one if none | |
1070 | * exists. Instead of creating one and destroying it when the command is | |
1071 | * handled, process that right before so we save some round trip in useless | |
1072 | * code path. | |
1073 | */ | |
3a91de3a | 1074 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1075 | case LTTNG_DISABLE_CHANNEL: |
1076 | case LTTNG_DISABLE_EVENT: | |
3a91de3a | 1077 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1078 | case LTTNG_DOMAIN_KERNEL: |
1079 | if (!cmd_ctx->session->kernel_session) { | |
1080 | ret = LTTNG_ERR_NO_CHANNEL; | |
1081 | goto error; | |
1082 | } | |
1083 | break; | |
1084 | case LTTNG_DOMAIN_JUL: | |
1085 | case LTTNG_DOMAIN_LOG4J: | |
1086 | case LTTNG_DOMAIN_PYTHON: | |
1087 | case LTTNG_DOMAIN_UST: | |
1088 | if (!cmd_ctx->session->ust_session) { | |
1089 | ret = LTTNG_ERR_NO_CHANNEL; | |
1090 | goto error; | |
1091 | } | |
1092 | break; | |
1093 | default: | |
1094 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1095 | goto error; | |
1096 | } | |
1097 | default: | |
1098 | break; | |
1099 | } | |
1100 | ||
1101 | if (!need_domain) { | |
1102 | goto skip_domain; | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Check domain type for specific "pre-action". | |
1107 | */ | |
3a91de3a | 1108 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1109 | case LTTNG_DOMAIN_KERNEL: |
1110 | if (!is_root) { | |
1111 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
1112 | goto error; | |
1113 | } | |
1114 | ||
7d268848 MD |
1115 | /* Kernel tracer check */ |
1116 | if (!kernel_tracer_is_initialized()) { | |
1117 | /* Basically, load kernel tracer modules */ | |
1118 | ret = init_kernel_tracer(); | |
1119 | if (ret != 0) { | |
1120 | goto error; | |
1121 | } | |
1122 | } | |
1123 | ||
917a718d | 1124 | /* Consumer is in an ERROR state. Report back to client */ |
412d7227 SM |
1125 | if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) == |
1126 | CONSUMER_ERROR) { | |
917a718d JG |
1127 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
1128 | goto error; | |
1129 | } | |
1130 | ||
1131 | /* Need a session for kernel command */ | |
1132 | if (need_tracing_session) { | |
1133 | if (cmd_ctx->session->kernel_session == NULL) { | |
1134 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 1135 | if (ret != LTTNG_OK) { |
917a718d JG |
1136 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
1137 | goto error; | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | /* Start the kernel consumer daemon */ | |
412d7227 SM |
1142 | pthread_mutex_lock(&the_kconsumer_data.pid_mutex); |
1143 | if (the_kconsumer_data.pid == 0 && | |
3a91de3a | 1144 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
412d7227 SM |
1145 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
1146 | ret = start_consumerd(&the_kconsumer_data); | |
917a718d JG |
1147 | if (ret < 0) { |
1148 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1149 | goto error; | |
1150 | } | |
412d7227 | 1151 | uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED); |
917a718d | 1152 | } else { |
412d7227 | 1153 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
917a718d JG |
1154 | } |
1155 | ||
1156 | /* | |
1157 | * The consumer was just spawned so we need to add the socket to | |
1158 | * the consumer output of the session if exist. | |
1159 | */ | |
412d7227 | 1160 | ret = consumer_create_socket(&the_kconsumer_data, |
917a718d JG |
1161 | cmd_ctx->session->kernel_session->consumer); |
1162 | if (ret < 0) { | |
1163 | goto error; | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | break; | |
1168 | case LTTNG_DOMAIN_JUL: | |
1169 | case LTTNG_DOMAIN_LOG4J: | |
1170 | case LTTNG_DOMAIN_PYTHON: | |
44760c20 JR |
1171 | if (!agent_tracing_is_enabled()) { |
1172 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1173 | goto error; | |
1174 | } | |
1175 | /* Fallthrough */ | |
917a718d JG |
1176 | case LTTNG_DOMAIN_UST: |
1177 | { | |
1178 | if (!ust_app_supported()) { | |
1179 | ret = LTTNG_ERR_NO_UST; | |
1180 | goto error; | |
1181 | } | |
9124c630 | 1182 | |
917a718d | 1183 | /* Consumer is in an ERROR state. Report back to client */ |
412d7227 SM |
1184 | if (need_consumerd && |
1185 | uatomic_read(&the_ust_consumerd_state) == | |
1186 | CONSUMER_ERROR) { | |
917a718d JG |
1187 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
1188 | goto error; | |
1189 | } | |
1190 | ||
1191 | if (need_tracing_session) { | |
1192 | /* Create UST session if none exist. */ | |
1193 | if (cmd_ctx->session->ust_session == NULL) { | |
1194 | ret = create_ust_session(cmd_ctx->session, | |
3a91de3a | 1195 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain)); |
917a718d JG |
1196 | if (ret != LTTNG_OK) { |
1197 | goto error; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | /* Start the UST consumer daemons */ | |
1202 | /* 64-bit */ | |
412d7227 SM |
1203 | pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex); |
1204 | if (the_config.consumerd64_bin_path.value && | |
1205 | the_ustconsumer64_data.pid == 0 && | |
3a91de3a | 1206 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
412d7227 SM |
1207 | pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex); |
1208 | ret = start_consumerd(&the_ustconsumer64_data); | |
917a718d JG |
1209 | if (ret < 0) { |
1210 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
412d7227 | 1211 | uatomic_set(&the_ust_consumerd64_fd, -EINVAL); |
917a718d JG |
1212 | goto error; |
1213 | } | |
1214 | ||
412d7227 SM |
1215 | uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock); |
1216 | uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED); | |
917a718d | 1217 | } else { |
412d7227 | 1218 | pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex); |
917a718d JG |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * Setup socket for consumer 64 bit. No need for atomic access | |
1223 | * since it was set above and can ONLY be set in this thread. | |
1224 | */ | |
412d7227 | 1225 | ret = consumer_create_socket(&the_ustconsumer64_data, |
917a718d JG |
1226 | cmd_ctx->session->ust_session->consumer); |
1227 | if (ret < 0) { | |
1228 | goto error; | |
1229 | } | |
1230 | ||
1231 | /* 32-bit */ | |
412d7227 SM |
1232 | pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex); |
1233 | if (the_config.consumerd32_bin_path.value && | |
1234 | the_ustconsumer32_data.pid == 0 && | |
3a91de3a | 1235 | cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) { |
412d7227 SM |
1236 | pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex); |
1237 | ret = start_consumerd(&the_ustconsumer32_data); | |
917a718d JG |
1238 | if (ret < 0) { |
1239 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
412d7227 | 1240 | uatomic_set(&the_ust_consumerd32_fd, -EINVAL); |
917a718d JG |
1241 | goto error; |
1242 | } | |
1243 | ||
412d7227 SM |
1244 | uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock); |
1245 | uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED); | |
917a718d | 1246 | } else { |
412d7227 | 1247 | pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex); |
917a718d JG |
1248 | } |
1249 | ||
1250 | /* | |
1251 | * Setup socket for consumer 32 bit. No need for atomic access | |
1252 | * since it was set above and can ONLY be set in this thread. | |
1253 | */ | |
412d7227 | 1254 | ret = consumer_create_socket(&the_ustconsumer32_data, |
917a718d JG |
1255 | cmd_ctx->session->ust_session->consumer); |
1256 | if (ret < 0) { | |
1257 | goto error; | |
1258 | } | |
1259 | } | |
1260 | break; | |
1261 | } | |
1262 | default: | |
1263 | break; | |
1264 | } | |
1265 | skip_domain: | |
1266 | ||
1267 | /* Validate consumer daemon state when start/stop trace command */ | |
3a91de3a JG |
1268 | if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE || |
1269 | cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) { | |
1270 | switch (cmd_ctx->lsm.domain.type) { | |
917a718d JG |
1271 | case LTTNG_DOMAIN_NONE: |
1272 | break; | |
1273 | case LTTNG_DOMAIN_JUL: | |
1274 | case LTTNG_DOMAIN_LOG4J: | |
1275 | case LTTNG_DOMAIN_PYTHON: | |
1276 | case LTTNG_DOMAIN_UST: | |
412d7227 | 1277 | if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) { |
917a718d JG |
1278 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
1279 | goto error; | |
1280 | } | |
1281 | break; | |
1282 | case LTTNG_DOMAIN_KERNEL: | |
412d7227 | 1283 | if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) { |
917a718d JG |
1284 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
1285 | goto error; | |
1286 | } | |
1287 | break; | |
1288 | default: | |
1289 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1290 | goto error; | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | /* | |
d7b377ed | 1295 | * Check that the UID matches that of the tracing session. |
917a718d JG |
1296 | * The root user can interact with all sessions. |
1297 | */ | |
1298 | if (need_tracing_session) { | |
1299 | if (!session_access_ok(cmd_ctx->session, | |
d7b377ed | 1300 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) || |
917a718d JG |
1301 | cmd_ctx->session->destroyed) { |
1302 | ret = LTTNG_ERR_EPERM; | |
1303 | goto error; | |
1304 | } | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * Send relayd information to consumer as soon as we have a domain and a | |
1309 | * session defined. | |
1310 | */ | |
1311 | if (cmd_ctx->session && need_domain) { | |
1312 | /* | |
1313 | * Setup relayd if not done yet. If the relayd information was already | |
1314 | * sent to the consumer, this call will gracefully return. | |
1315 | */ | |
1316 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1317 | if (ret != LTTNG_OK) { | |
1318 | goto error; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | /* Process by command type */ | |
3a91de3a | 1323 | switch (cmd_ctx->lsm.cmd_type) { |
917a718d JG |
1324 | case LTTNG_ADD_CONTEXT: |
1325 | { | |
1326 | /* | |
1327 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1328 | * payload if the context being added is an application context. | |
1329 | */ | |
3a91de3a | 1330 | if (cmd_ctx->lsm.u.context.ctx.ctx == |
917a718d JG |
1331 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
1332 | char *provider_name = NULL, *context_name = NULL; | |
1333 | size_t provider_name_len = | |
3a91de3a | 1334 | cmd_ctx->lsm.u.context.provider_name_len; |
917a718d | 1335 | size_t context_name_len = |
3a91de3a | 1336 | cmd_ctx->lsm.u.context.context_name_len; |
917a718d JG |
1337 | |
1338 | if (provider_name_len == 0 || context_name_len == 0) { | |
1339 | /* | |
1340 | * Application provider and context names MUST | |
1341 | * be provided. | |
1342 | */ | |
1343 | ret = -LTTNG_ERR_INVALID; | |
1344 | goto error; | |
1345 | } | |
1346 | ||
1347 | provider_name = zmalloc(provider_name_len + 1); | |
1348 | if (!provider_name) { | |
1349 | ret = -LTTNG_ERR_NOMEM; | |
1350 | goto error; | |
1351 | } | |
3a91de3a | 1352 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = |
917a718d JG |
1353 | provider_name; |
1354 | ||
1355 | context_name = zmalloc(context_name_len + 1); | |
1356 | if (!context_name) { | |
1357 | ret = -LTTNG_ERR_NOMEM; | |
1358 | goto error_add_context; | |
1359 | } | |
3a91de3a | 1360 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = |
917a718d JG |
1361 | context_name; |
1362 | ||
3e3665b8 | 1363 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
917a718d JG |
1364 | provider_name_len); |
1365 | if (ret < 0) { | |
1366 | goto error_add_context; | |
1367 | } | |
1368 | ||
3e3665b8 | 1369 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
917a718d JG |
1370 | context_name_len); |
1371 | if (ret < 0) { | |
1372 | goto error_add_context; | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * cmd_add_context assumes ownership of the provider and context | |
1378 | * names. | |
1379 | */ | |
1380 | ret = cmd_add_context(cmd_ctx->session, | |
3a91de3a JG |
1381 | cmd_ctx->lsm.domain.type, |
1382 | cmd_ctx->lsm.u.context.channel_name, | |
1383 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.context.ctx), | |
412d7227 | 1384 | the_kernel_poll_pipe[1]); |
917a718d | 1385 | |
3a91de3a JG |
1386 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = NULL; |
1387 | cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = NULL; | |
917a718d | 1388 | error_add_context: |
3a91de3a JG |
1389 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name); |
1390 | free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name); | |
917a718d JG |
1391 | if (ret < 0) { |
1392 | goto error; | |
1393 | } | |
1394 | break; | |
1395 | } | |
1396 | case LTTNG_DISABLE_CHANNEL: | |
1397 | { | |
3a91de3a JG |
1398 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1399 | cmd_ctx->lsm.u.disable.channel_name); | |
917a718d JG |
1400 | break; |
1401 | } | |
1402 | case LTTNG_DISABLE_EVENT: | |
1403 | { | |
1404 | ||
1405 | /* | |
1406 | * FIXME: handle filter; for now we just receive the filter's | |
1407 | * bytecode along with the filter expression which are sent by | |
1408 | * liblttng-ctl and discard them. | |
1409 | * | |
1410 | * This fixes an issue where the client may block while sending | |
1411 | * the filter payload and encounter an error because the session | |
1412 | * daemon closes the socket without ever handling this data. | |
1413 | */ | |
3a91de3a JG |
1414 | size_t count = cmd_ctx->lsm.u.disable.expression_len + |
1415 | cmd_ctx->lsm.u.disable.bytecode_len; | |
917a718d JG |
1416 | |
1417 | if (count) { | |
1418 | char data[LTTNG_FILTER_MAX_LEN]; | |
1419 | ||
1420 | DBG("Discarding disable event command payload of size %zu", count); | |
1421 | while (count) { | |
3e3665b8 | 1422 | ret = lttcomm_recv_unix_sock(*sock, data, |
917a718d JG |
1423 | count > sizeof(data) ? sizeof(data) : count); |
1424 | if (ret < 0) { | |
1425 | goto error; | |
1426 | } | |
1427 | ||
1428 | count -= (size_t) ret; | |
1429 | } | |
1430 | } | |
3a91de3a JG |
1431 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
1432 | cmd_ctx->lsm.u.disable.channel_name, | |
1433 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.disable.event)); | |
917a718d JG |
1434 | break; |
1435 | } | |
1436 | case LTTNG_ENABLE_CHANNEL: | |
1437 | { | |
3a91de3a JG |
1438 | cmd_ctx->lsm.u.channel.chan.attr.extended.ptr = |
1439 | (struct lttng_channel_extended *) &cmd_ctx->lsm.u.channel.extended; | |
df4f5a87 | 1440 | ret = cmd_enable_channel(cmd_ctx->session, |
3a91de3a JG |
1441 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1442 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.channel.chan), | |
412d7227 | 1443 | the_kernel_poll_pipe[1]); |
917a718d JG |
1444 | break; |
1445 | } | |
159b042f JG |
1446 | case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE: |
1447 | case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE: | |
917a718d | 1448 | { |
159b042f JG |
1449 | struct lttng_dynamic_buffer payload; |
1450 | struct lttng_buffer_view payload_view; | |
1451 | const bool add_value = | |
3a91de3a | 1452 | cmd_ctx->lsm.cmd_type == |
159b042f JG |
1453 | LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE; |
1454 | const size_t name_len = | |
3a91de3a | 1455 | cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1456 | .name_len; |
1457 | const enum lttng_domain_type domain_type = | |
1458 | (enum lttng_domain_type) | |
3a91de3a | 1459 | cmd_ctx->lsm.domain.type; |
159b042f | 1460 | const enum lttng_process_attr process_attr = |
3a91de3a | 1461 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1462 | .process_attr_tracker_add_remove_include_value |
1463 | .process_attr; | |
1464 | const enum lttng_process_attr_value_type value_type = | |
1465 | (enum lttng_process_attr_value_type) cmd_ctx | |
3a91de3a | 1466 | ->lsm.u |
159b042f JG |
1467 | .process_attr_tracker_add_remove_include_value |
1468 | .value_type; | |
1469 | struct process_attr_value *value; | |
1470 | enum lttng_error_code ret_code; | |
1434fd36 MJ |
1471 | long login_name_max; |
1472 | ||
1473 | login_name_max = sysconf(_SC_LOGIN_NAME_MAX); | |
1474 | if (login_name_max < 0) { | |
1475 | PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration"); | |
1476 | ret = LTTNG_ERR_INVALID; | |
1477 | goto error; | |
1478 | } | |
159b042f JG |
1479 | |
1480 | /* Receive remaining variable length payload if applicable. */ | |
1434fd36 | 1481 | if (name_len > login_name_max) { |
159b042f JG |
1482 | /* |
1483 | * POSIX mandates user and group names that are at least | |
1484 | * 8 characters long. Note that although shadow-utils | |
1485 | * (useradd, groupaadd, etc.) use 32 chars as their | |
1486 | * limit (from bits/utmp.h, UT_NAMESIZE), | |
1487 | * LOGIN_NAME_MAX is defined to 256. | |
1488 | */ | |
1434fd36 | 1489 | ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld", |
159b042f | 1490 | add_value ? "addition" : "removal", |
1434fd36 | 1491 | name_len, login_name_max); |
159b042f | 1492 | ret = LTTNG_ERR_INVALID; |
2d97a006 JR |
1493 | goto error; |
1494 | } | |
1495 | ||
159b042f JG |
1496 | lttng_dynamic_buffer_init(&payload); |
1497 | if (name_len != 0) { | |
1498 | /* | |
1499 | * Receive variable payload for user/group name | |
1500 | * arguments. | |
1501 | */ | |
1502 | ret = lttng_dynamic_buffer_set_size(&payload, name_len); | |
1503 | if (ret) { | |
1504 | ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument", | |
1505 | add_value ? "add" : "remove"); | |
55c9e7ca | 1506 | ret = LTTNG_ERR_NOMEM; |
159b042f | 1507 | goto error_add_remove_tracker_value; |
55c9e7ca | 1508 | } |
159b042f JG |
1509 | |
1510 | ret = lttcomm_recv_unix_sock( | |
1511 | *sock, payload.data, name_len); | |
55c9e7ca | 1512 | if (ret <= 0) { |
159b042f JG |
1513 | ERR("Failed to receive payload of %s process attribute tracker value argument", |
1514 | add_value ? "add" : "remove"); | |
55c9e7ca | 1515 | *sock_error = 1; |
159b042f JG |
1516 | ret = LTTNG_ERR_INVALID_PROTOCOL; |
1517 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1518 | } |
159b042f | 1519 | } |
2d97a006 | 1520 | |
159b042f JG |
1521 | payload_view = lttng_buffer_view_from_dynamic_buffer( |
1522 | &payload, 0, name_len); | |
3e6e0df2 JG |
1523 | if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) { |
1524 | ret = LTTNG_ERR_INVALID_PROTOCOL; | |
1525 | goto error_add_remove_tracker_value; | |
1526 | } | |
1527 | ||
159b042f JG |
1528 | /* |
1529 | * Validate the value type and domains are legal for the process | |
1530 | * attribute tracker that is specified and convert the value to | |
1531 | * add/remove to the internal sessiond representation. | |
1532 | */ | |
1533 | ret_code = process_attr_value_from_comm(domain_type, | |
1534 | process_attr, value_type, | |
3a91de3a | 1535 | &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value |
159b042f JG |
1536 | .integral_value, |
1537 | &payload_view, &value); | |
1538 | if (ret_code != LTTNG_OK) { | |
1539 | ret = ret_code; | |
1540 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1541 | } |
159b042f JG |
1542 | |
1543 | if (add_value) { | |
1544 | ret = cmd_process_attr_tracker_inclusion_set_add_value( | |
1545 | cmd_ctx->session, domain_type, | |
1546 | process_attr, value); | |
1547 | } else { | |
1548 | ret = cmd_process_attr_tracker_inclusion_set_remove_value( | |
1549 | cmd_ctx->session, domain_type, | |
1550 | process_attr, value); | |
1551 | } | |
1552 | process_attr_value_destroy(value); | |
1553 | error_add_remove_tracker_value: | |
1554 | lttng_dynamic_buffer_reset(&payload); | |
1555 | break; | |
1556 | } | |
1557 | case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY: | |
1558 | { | |
1559 | enum lttng_tracking_policy tracking_policy; | |
1560 | const enum lttng_domain_type domain_type = | |
1561 | (enum lttng_domain_type) | |
3a91de3a | 1562 | cmd_ctx->lsm.domain.type; |
159b042f | 1563 | const enum lttng_process_attr process_attr = |
3a91de3a | 1564 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1565 | .process_attr_tracker_get_tracking_policy |
1566 | .process_attr; | |
1567 | ||
1568 | ret = cmd_process_attr_tracker_get_tracking_policy( | |
1569 | cmd_ctx->session, domain_type, process_attr, | |
1570 | &tracking_policy); | |
1571 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1572 | goto error; |
1573 | } | |
2d97a006 | 1574 | |
159b042f JG |
1575 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, |
1576 | &(uint32_t){tracking_policy}, sizeof(uint32_t)); | |
1577 | if (ret < 0) { | |
1578 | ret = LTTNG_ERR_NOMEM; | |
2d97a006 JR |
1579 | goto error; |
1580 | } | |
159b042f | 1581 | ret = LTTNG_OK; |
917a718d JG |
1582 | break; |
1583 | } | |
159b042f | 1584 | case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY: |
917a718d | 1585 | { |
159b042f | 1586 | const enum lttng_tracking_policy tracking_policy = |
3a91de3a | 1587 | (enum lttng_tracking_policy) cmd_ctx->lsm.u |
159b042f JG |
1588 | .process_attr_tracker_set_tracking_policy |
1589 | .tracking_policy; | |
1590 | const enum lttng_domain_type domain_type = | |
1591 | (enum lttng_domain_type) | |
3a91de3a | 1592 | cmd_ctx->lsm.domain.type; |
159b042f | 1593 | const enum lttng_process_attr process_attr = |
3a91de3a | 1594 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1595 | .process_attr_tracker_set_tracking_policy |
1596 | .process_attr; | |
1597 | ||
1598 | ret = cmd_process_attr_tracker_set_tracking_policy( | |
1599 | cmd_ctx->session, domain_type, process_attr, | |
1600 | tracking_policy); | |
1601 | if (ret != LTTNG_OK) { | |
1602 | goto error; | |
55c9e7ca | 1603 | } |
159b042f JG |
1604 | break; |
1605 | } | |
1606 | case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
1607 | { | |
1608 | struct lttng_process_attr_values *values; | |
1609 | struct lttng_dynamic_buffer reply; | |
1610 | const enum lttng_domain_type domain_type = | |
1611 | (enum lttng_domain_type) | |
3a91de3a | 1612 | cmd_ctx->lsm.domain.type; |
159b042f | 1613 | const enum lttng_process_attr process_attr = |
3a91de3a | 1614 | (enum lttng_process_attr) cmd_ctx->lsm.u |
159b042f JG |
1615 | .process_attr_tracker_get_inclusion_set |
1616 | .process_attr; | |
1617 | ||
1618 | ret = cmd_process_attr_tracker_get_inclusion_set( | |
1619 | cmd_ctx->session, domain_type, process_attr, | |
1620 | &values); | |
1621 | if (ret != LTTNG_OK) { | |
55c9e7ca JR |
1622 | goto error; |
1623 | } | |
2d97a006 | 1624 | |
159b042f JG |
1625 | lttng_dynamic_buffer_init(&reply); |
1626 | ret = lttng_process_attr_values_serialize(values, &reply); | |
1627 | if (ret < 0) { | |
1628 | goto error_tracker_get_inclusion_set; | |
2d97a006 JR |
1629 | } |
1630 | ||
159b042f JG |
1631 | ret = setup_lttng_msg_no_cmd_header( |
1632 | cmd_ctx, reply.data, reply.size); | |
1633 | if (ret < 0) { | |
1634 | ret = LTTNG_ERR_NOMEM; | |
1635 | goto error_tracker_get_inclusion_set; | |
1636 | } | |
1637 | ret = LTTNG_OK; | |
1638 | ||
1639 | error_tracker_get_inclusion_set: | |
1640 | lttng_process_attr_values_destroy(values); | |
1641 | lttng_dynamic_buffer_reset(&reply); | |
917a718d JG |
1642 | break; |
1643 | } | |
1644 | case LTTNG_ENABLE_EVENT: | |
1645 | { | |
1646 | struct lttng_event *ev = NULL; | |
1647 | struct lttng_event_exclusion *exclusion = NULL; | |
2b00d462 | 1648 | struct lttng_bytecode *bytecode = NULL; |
917a718d JG |
1649 | char *filter_expression = NULL; |
1650 | ||
1651 | /* Handle exclusion events and receive it from the client. */ | |
3a91de3a JG |
1652 | if (cmd_ctx->lsm.u.enable.exclusion_count > 0) { |
1653 | size_t count = cmd_ctx->lsm.u.enable.exclusion_count; | |
917a718d JG |
1654 | |
1655 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1656 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1657 | if (!exclusion) { | |
1658 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1659 | goto error; | |
1660 | } | |
1661 | ||
1662 | DBG("Receiving var len exclusion event list from client ..."); | |
1663 | exclusion->count = count; | |
3e3665b8 | 1664 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
917a718d JG |
1665 | count * LTTNG_SYMBOL_NAME_LEN); |
1666 | if (ret <= 0) { | |
1667 | DBG("Nothing recv() from client var len data... continuing"); | |
1668 | *sock_error = 1; | |
1669 | free(exclusion); | |
1670 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1671 | goto error; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | /* Get filter expression from client. */ | |
3a91de3a | 1676 | if (cmd_ctx->lsm.u.enable.expression_len > 0) { |
917a718d | 1677 | size_t expression_len = |
3a91de3a | 1678 | cmd_ctx->lsm.u.enable.expression_len; |
917a718d JG |
1679 | |
1680 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1681 | ret = LTTNG_ERR_FILTER_INVAL; | |
1682 | free(exclusion); | |
1683 | goto error; | |
1684 | } | |
1685 | ||
1686 | filter_expression = zmalloc(expression_len); | |
1687 | if (!filter_expression) { | |
1688 | free(exclusion); | |
1689 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1690 | goto error; | |
1691 | } | |
1692 | ||
1693 | /* Receive var. len. data */ | |
1694 | DBG("Receiving var len filter's expression from client ..."); | |
3e3665b8 | 1695 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
917a718d JG |
1696 | expression_len); |
1697 | if (ret <= 0) { | |
1698 | DBG("Nothing recv() from client var len data... continuing"); | |
1699 | *sock_error = 1; | |
1700 | free(filter_expression); | |
1701 | free(exclusion); | |
1702 | ret = LTTNG_ERR_FILTER_INVAL; | |
1703 | goto error; | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | /* Handle filter and get bytecode from client. */ | |
3a91de3a JG |
1708 | if (cmd_ctx->lsm.u.enable.bytecode_len > 0) { |
1709 | size_t bytecode_len = cmd_ctx->lsm.u.enable.bytecode_len; | |
917a718d JG |
1710 | |
1711 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1712 | ret = LTTNG_ERR_FILTER_INVAL; | |
1713 | free(filter_expression); | |
1714 | free(exclusion); | |
1715 | goto error; | |
1716 | } | |
1717 | ||
1718 | bytecode = zmalloc(bytecode_len); | |
1719 | if (!bytecode) { | |
1720 | free(filter_expression); | |
1721 | free(exclusion); | |
1722 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1723 | goto error; | |
1724 | } | |
1725 | ||
1726 | /* Receive var. len. data */ | |
1727 | DBG("Receiving var len filter's bytecode from client ..."); | |
3e3665b8 | 1728 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
917a718d JG |
1729 | if (ret <= 0) { |
1730 | DBG("Nothing recv() from client var len data... continuing"); | |
1731 | *sock_error = 1; | |
1732 | free(filter_expression); | |
1733 | free(bytecode); | |
1734 | free(exclusion); | |
1735 | ret = LTTNG_ERR_FILTER_INVAL; | |
1736 | goto error; | |
1737 | } | |
1738 | ||
1739 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1740 | free(filter_expression); | |
1741 | free(bytecode); | |
1742 | free(exclusion); | |
1743 | ret = LTTNG_ERR_FILTER_INVAL; | |
1744 | goto error; | |
1745 | } | |
1746 | } | |
1747 | ||
3a91de3a | 1748 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm.u.enable.event)); |
917a718d JG |
1749 | if (!ev) { |
1750 | DBG("Failed to copy event: %s", | |
3a91de3a | 1751 | cmd_ctx->lsm.u.enable.event.name); |
917a718d JG |
1752 | free(filter_expression); |
1753 | free(bytecode); | |
1754 | free(exclusion); | |
1755 | ret = LTTNG_ERR_NOMEM; | |
1756 | goto error; | |
1757 | } | |
1758 | ||
1759 | ||
3a91de3a | 1760 | if (cmd_ctx->lsm.u.enable.userspace_probe_location_len > 0) { |
917a718d | 1761 | /* Expect a userspace probe description. */ |
3e3665b8 | 1762 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
917a718d JG |
1763 | if (ret) { |
1764 | free(filter_expression); | |
1765 | free(bytecode); | |
1766 | free(exclusion); | |
1767 | lttng_event_destroy(ev); | |
1768 | goto error; | |
1769 | } | |
1770 | } | |
1771 | ||
df4f5a87 | 1772 | ret = cmd_enable_event(cmd_ctx->session, |
3a91de3a JG |
1773 | ALIGNED_CONST_PTR(cmd_ctx->lsm.domain), |
1774 | cmd_ctx->lsm.u.enable.channel_name, | |
917a718d JG |
1775 | ev, |
1776 | filter_expression, bytecode, exclusion, | |
412d7227 | 1777 | the_kernel_poll_pipe[1]); |
917a718d JG |
1778 | lttng_event_destroy(ev); |
1779 | break; | |
1780 | } | |
1781 | case LTTNG_LIST_TRACEPOINTS: | |
1782 | { | |
1783 | struct lttng_event *events; | |
1784 | ssize_t nb_events; | |
1785 | ||
1786 | session_lock_list(); | |
3a91de3a | 1787 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm.domain.type, &events); |
917a718d JG |
1788 | session_unlock_list(); |
1789 | if (nb_events < 0) { | |
1790 | /* Return value is a negative lttng_error_code. */ | |
1791 | ret = -nb_events; | |
1792 | goto error; | |
1793 | } | |
1794 | ||
1795 | /* | |
1796 | * Setup lttng message with payload size set to the event list size in | |
1797 | * bytes and then copy list into the llm payload. | |
1798 | */ | |
1799 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1800 | sizeof(struct lttng_event) * nb_events); | |
1801 | free(events); | |
1802 | ||
1803 | if (ret < 0) { | |
1804 | goto setup_error; | |
1805 | } | |
1806 | ||
1807 | ret = LTTNG_OK; | |
1808 | break; | |
1809 | } | |
1810 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1811 | { | |
1812 | struct lttng_event_field *fields; | |
1813 | ssize_t nb_fields; | |
1814 | ||
1815 | session_lock_list(); | |
3a91de3a | 1816 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm.domain.type, |
917a718d JG |
1817 | &fields); |
1818 | session_unlock_list(); | |
1819 | if (nb_fields < 0) { | |
1820 | /* Return value is a negative lttng_error_code. */ | |
1821 | ret = -nb_fields; | |
1822 | goto error; | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Setup lttng message with payload size set to the event list size in | |
1827 | * bytes and then copy list into the llm payload. | |
1828 | */ | |
1829 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1830 | sizeof(struct lttng_event_field) * nb_fields); | |
1831 | free(fields); | |
1832 | ||
1833 | if (ret < 0) { | |
1834 | goto setup_error; | |
1835 | } | |
1836 | ||
1837 | ret = LTTNG_OK; | |
1838 | break; | |
1839 | } | |
1840 | case LTTNG_LIST_SYSCALLS: | |
1841 | { | |
1842 | struct lttng_event *events; | |
1843 | ssize_t nb_events; | |
1844 | ||
1845 | nb_events = cmd_list_syscalls(&events); | |
1846 | if (nb_events < 0) { | |
1847 | /* Return value is a negative lttng_error_code. */ | |
1848 | ret = -nb_events; | |
1849 | goto error; | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * Setup lttng message with payload size set to the event list size in | |
1854 | * bytes and then copy list into the llm payload. | |
1855 | */ | |
1856 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1857 | sizeof(struct lttng_event) * nb_events); | |
1858 | free(events); | |
1859 | ||
1860 | if (ret < 0) { | |
1861 | goto setup_error; | |
1862 | } | |
1863 | ||
1864 | ret = LTTNG_OK; | |
1865 | break; | |
1866 | } | |
917a718d JG |
1867 | case LTTNG_SET_CONSUMER_URI: |
1868 | { | |
1869 | size_t nb_uri, len; | |
1870 | struct lttng_uri *uris; | |
1871 | ||
3a91de3a | 1872 | nb_uri = cmd_ctx->lsm.u.uri.size; |
917a718d JG |
1873 | len = nb_uri * sizeof(struct lttng_uri); |
1874 | ||
1875 | if (nb_uri == 0) { | |
1876 | ret = LTTNG_ERR_INVALID; | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | uris = zmalloc(len); | |
1881 | if (uris == NULL) { | |
1882 | ret = LTTNG_ERR_FATAL; | |
1883 | goto error; | |
1884 | } | |
1885 | ||
1886 | /* Receive variable len data */ | |
1887 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1888 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1889 | if (ret <= 0) { |
1890 | DBG("No URIs received from client... continuing"); | |
1891 | *sock_error = 1; | |
1892 | ret = LTTNG_ERR_SESSION_FAIL; | |
1893 | free(uris); | |
1894 | goto error; | |
1895 | } | |
1896 | ||
1897 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1898 | free(uris); | |
1899 | if (ret != LTTNG_OK) { | |
1900 | goto error; | |
1901 | } | |
1902 | ||
1903 | ||
1904 | break; | |
1905 | } | |
1906 | case LTTNG_START_TRACE: | |
1907 | { | |
1908 | /* | |
1909 | * On the first start, if we have a kernel session and we have | |
1910 | * enabled time or size-based rotations, we have to make sure | |
1911 | * the kernel tracer supports it. | |
1912 | */ | |
1913 | if (!cmd_ctx->session->has_been_started && \ | |
1914 | cmd_ctx->session->kernel_session && \ | |
1915 | (cmd_ctx->session->rotate_timer_period || \ | |
1916 | cmd_ctx->session->rotate_size) && \ | |
1917 | !check_rotate_compatible()) { | |
1918 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1919 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1920 | goto error; | |
1921 | } | |
1922 | ret = cmd_start_trace(cmd_ctx->session); | |
1923 | break; | |
1924 | } | |
1925 | case LTTNG_STOP_TRACE: | |
1926 | { | |
1927 | ret = cmd_stop_trace(cmd_ctx->session); | |
1928 | break; | |
1929 | } | |
917a718d JG |
1930 | case LTTNG_DESTROY_SESSION: |
1931 | { | |
1932 | ret = cmd_destroy_session(cmd_ctx->session, | |
412d7227 | 1933 | the_notification_thread_handle, sock); |
917a718d JG |
1934 | break; |
1935 | } | |
1936 | case LTTNG_LIST_DOMAINS: | |
1937 | { | |
1938 | ssize_t nb_dom; | |
1939 | struct lttng_domain *domains = NULL; | |
1940 | ||
1941 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1942 | if (nb_dom < 0) { | |
1943 | /* Return value is a negative lttng_error_code. */ | |
1944 | ret = -nb_dom; | |
1945 | goto error; | |
1946 | } | |
1947 | ||
1948 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1949 | nb_dom * sizeof(struct lttng_domain)); | |
1950 | free(domains); | |
1951 | ||
1952 | if (ret < 0) { | |
1953 | goto setup_error; | |
1954 | } | |
1955 | ||
1956 | ret = LTTNG_OK; | |
1957 | break; | |
1958 | } | |
1959 | case LTTNG_LIST_CHANNELS: | |
1960 | { | |
1961 | ssize_t payload_size; | |
1962 | struct lttng_channel *channels = NULL; | |
1963 | ||
3a91de3a | 1964 | payload_size = cmd_list_channels(cmd_ctx->lsm.domain.type, |
917a718d JG |
1965 | cmd_ctx->session, &channels); |
1966 | if (payload_size < 0) { | |
1967 | /* Return value is a negative lttng_error_code. */ | |
1968 | ret = -payload_size; | |
1969 | goto error; | |
1970 | } | |
1971 | ||
1972 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
1973 | payload_size); | |
1974 | free(channels); | |
1975 | ||
1976 | if (ret < 0) { | |
1977 | goto setup_error; | |
1978 | } | |
1979 | ||
1980 | ret = LTTNG_OK; | |
1981 | break; | |
1982 | } | |
1983 | case LTTNG_LIST_EVENTS: | |
1984 | { | |
e368fb43 JG |
1985 | ssize_t list_ret; |
1986 | struct lttcomm_event_command_header cmd_header = {}; | |
1987 | size_t original_payload_size; | |
1988 | size_t payload_size; | |
1989 | ||
1990 | ret = setup_empty_lttng_msg(cmd_ctx); | |
1991 | if (ret) { | |
1992 | ret = LTTNG_ERR_NOMEM; | |
1993 | goto setup_error; | |
917a718d JG |
1994 | } |
1995 | ||
e368fb43 | 1996 | original_payload_size = cmd_ctx->reply_payload.buffer.size; |
917a718d | 1997 | |
e368fb43 JG |
1998 | /* Extended infos are included at the end of the payload. */ |
1999 | list_ret = cmd_list_events(cmd_ctx->lsm.domain.type, | |
2000 | cmd_ctx->session, | |
2001 | cmd_ctx->lsm.u.list.channel_name, | |
2002 | &cmd_ctx->reply_payload); | |
2003 | if (list_ret < 0) { | |
2004 | /* Return value is a negative lttng_error_code. */ | |
2005 | ret = -list_ret; | |
2006 | goto error; | |
917a718d JG |
2007 | } |
2008 | ||
e368fb43 JG |
2009 | payload_size = cmd_ctx->reply_payload.buffer.size - |
2010 | sizeof(cmd_header) - original_payload_size; | |
2011 | update_lttng_msg(cmd_ctx, sizeof(cmd_header), payload_size); | |
2012 | ||
917a718d JG |
2013 | ret = LTTNG_OK; |
2014 | break; | |
2015 | } | |
2016 | case LTTNG_LIST_SESSIONS: | |
2017 | { | |
2018 | unsigned int nr_sessions; | |
2019 | void *sessions_payload; | |
2020 | size_t payload_len; | |
2021 | ||
2022 | session_lock_list(); | |
2023 | nr_sessions = lttng_sessions_count( | |
2024 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2025 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e JG |
2026 | |
2027 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + | |
2028 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
917a718d JG |
2029 | sessions_payload = zmalloc(payload_len); |
2030 | ||
2031 | if (!sessions_payload) { | |
2032 | session_unlock_list(); | |
2033 | ret = -ENOMEM; | |
2034 | goto setup_error; | |
2035 | } | |
2036 | ||
b178f53e | 2037 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
917a718d JG |
2038 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2039 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
2040 | session_unlock_list(); | |
2041 | ||
2042 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
2043 | payload_len); | |
2044 | free(sessions_payload); | |
2045 | ||
2046 | if (ret < 0) { | |
2047 | goto setup_error; | |
2048 | } | |
2049 | ||
2050 | ret = LTTNG_OK; | |
2051 | break; | |
2052 | } | |
2053 | case LTTNG_REGISTER_CONSUMER: | |
2054 | { | |
2055 | struct consumer_data *cdata; | |
2056 | ||
3a91de3a | 2057 | switch (cmd_ctx->lsm.domain.type) { |
917a718d | 2058 | case LTTNG_DOMAIN_KERNEL: |
412d7227 | 2059 | cdata = &the_kconsumer_data; |
917a718d JG |
2060 | break; |
2061 | default: | |
2062 | ret = LTTNG_ERR_UND; | |
2063 | goto error; | |
2064 | } | |
2065 | ||
3a91de3a JG |
2066 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type, |
2067 | cmd_ctx->lsm.u.reg.path, cdata); | |
917a718d JG |
2068 | break; |
2069 | } | |
2070 | case LTTNG_DATA_PENDING: | |
2071 | { | |
2072 | int pending_ret; | |
2073 | uint8_t pending_ret_byte; | |
2074 | ||
2075 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
2076 | ||
2077 | /* | |
2078 | * FIXME | |
2079 | * | |
2080 | * This function may returns 0 or 1 to indicate whether or not | |
2081 | * there is data pending. In case of error, it should return an | |
2082 | * LTTNG_ERR code. However, some code paths may still return | |
2083 | * a nondescript error code, which we handle by returning an | |
2084 | * "unknown" error. | |
2085 | */ | |
2086 | if (pending_ret == 0 || pending_ret == 1) { | |
2087 | /* | |
2088 | * ret will be set to LTTNG_OK at the end of | |
2089 | * this function. | |
2090 | */ | |
2091 | } else if (pending_ret < 0) { | |
2092 | ret = LTTNG_ERR_UNK; | |
2093 | goto setup_error; | |
2094 | } else { | |
2095 | ret = pending_ret; | |
2096 | goto setup_error; | |
2097 | } | |
2098 | ||
2099 | pending_ret_byte = (uint8_t) pending_ret; | |
2100 | ||
2101 | /* 1 byte to return whether or not data is pending */ | |
2102 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
2103 | &pending_ret_byte, 1); | |
2104 | ||
2105 | if (ret < 0) { | |
2106 | goto setup_error; | |
2107 | } | |
2108 | ||
2109 | ret = LTTNG_OK; | |
2110 | break; | |
2111 | } | |
2112 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
2113 | { | |
a914e76a | 2114 | uint32_t snapshot_id; |
917a718d JG |
2115 | struct lttcomm_lttng_output_id reply; |
2116 | ||
2117 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3a91de3a | 2118 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output), |
df4f5a87 | 2119 | &snapshot_id); |
917a718d JG |
2120 | if (ret != LTTNG_OK) { |
2121 | goto error; | |
2122 | } | |
a914e76a | 2123 | reply.id = snapshot_id; |
917a718d JG |
2124 | |
2125 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
2126 | sizeof(reply)); | |
2127 | if (ret < 0) { | |
2128 | goto setup_error; | |
2129 | } | |
2130 | ||
2131 | /* Copy output list into message payload */ | |
2132 | ret = LTTNG_OK; | |
2133 | break; | |
2134 | } | |
2135 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2136 | { | |
2137 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
3a91de3a | 2138 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output)); |
917a718d JG |
2139 | break; |
2140 | } | |
2141 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2142 | { | |
2143 | ssize_t nb_output; | |
2144 | struct lttng_snapshot_output *outputs = NULL; | |
2145 | ||
2146 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
2147 | if (nb_output < 0) { | |
2148 | ret = -nb_output; | |
2149 | goto error; | |
2150 | } | |
2151 | ||
2152 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
2153 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
2154 | nb_output * sizeof(struct lttng_snapshot_output)); | |
2155 | free(outputs); | |
2156 | ||
2157 | if (ret < 0) { | |
2158 | goto setup_error; | |
2159 | } | |
2160 | ||
2161 | ret = LTTNG_OK; | |
2162 | break; | |
2163 | } | |
2164 | case LTTNG_SNAPSHOT_RECORD: | |
2165 | { | |
2166 | ret = cmd_snapshot_record(cmd_ctx->session, | |
3a91de3a JG |
2167 | ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_record.output), |
2168 | cmd_ctx->lsm.u.snapshot_record.wait); | |
917a718d JG |
2169 | break; |
2170 | } | |
b178f53e | 2171 | case LTTNG_CREATE_SESSION_EXT: |
917a718d | 2172 | { |
b178f53e JG |
2173 | struct lttng_dynamic_buffer payload; |
2174 | struct lttng_session_descriptor *return_descriptor = NULL; | |
917a718d | 2175 | |
b178f53e | 2176 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 2177 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
2178 | if (ret != LTTNG_OK) { |
2179 | goto error; | |
917a718d JG |
2180 | } |
2181 | ||
b178f53e JG |
2182 | ret = lttng_session_descriptor_serialize(return_descriptor, |
2183 | &payload); | |
2184 | if (ret) { | |
2185 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
2186 | lttng_session_descriptor_destroy(return_descriptor); | |
2187 | ret = LTTNG_ERR_NOMEM; | |
2188 | goto error; | |
917a718d | 2189 | } |
b178f53e JG |
2190 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
2191 | payload.size); | |
2192 | if (ret) { | |
2193 | lttng_session_descriptor_destroy(return_descriptor); | |
2194 | ret = LTTNG_ERR_NOMEM; | |
2195 | goto error; | |
2196 | } | |
2197 | lttng_dynamic_buffer_reset(&payload); | |
2198 | lttng_session_descriptor_destroy(return_descriptor); | |
2199 | ret = LTTNG_OK; | |
917a718d JG |
2200 | break; |
2201 | } | |
2202 | case LTTNG_SAVE_SESSION: | |
2203 | { | |
3a91de3a | 2204 | ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr, |
917a718d JG |
2205 | &cmd_ctx->creds); |
2206 | break; | |
2207 | } | |
2208 | case LTTNG_SET_SESSION_SHM_PATH: | |
2209 | { | |
2210 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
3a91de3a | 2211 | cmd_ctx->lsm.u.set_shm_path.shm_path); |
917a718d JG |
2212 | break; |
2213 | } | |
2214 | case LTTNG_REGENERATE_METADATA: | |
2215 | { | |
2216 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
2217 | break; | |
2218 | } | |
2219 | case LTTNG_REGENERATE_STATEDUMP: | |
2220 | { | |
2221 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
2222 | break; | |
2223 | } | |
2224 | case LTTNG_REGISTER_TRIGGER: | |
2225 | { | |
746e08d7 | 2226 | struct lttng_trigger *payload_trigger; |
242388e4 | 2227 | struct lttng_trigger *return_trigger; |
746e08d7 JG |
2228 | size_t original_reply_payload_size; |
2229 | size_t reply_payload_size; | |
2230 | const struct lttng_credentials cmd_creds = { | |
2231 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2232 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2233 | }; | |
242388e4 JR |
2234 | |
2235 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2236 | if (ret) { | |
2237 | ret = LTTNG_ERR_NOMEM; | |
2238 | goto setup_error; | |
2239 | } | |
2240 | ||
746e08d7 JG |
2241 | ret = receive_lttng_trigger( |
2242 | cmd_ctx, *sock, sock_error, &payload_trigger); | |
2243 | if (ret != LTTNG_OK) { | |
2244 | goto error; | |
2245 | } | |
2246 | ||
2247 | original_reply_payload_size = cmd_ctx->reply_payload.buffer.size; | |
242388e4 | 2248 | |
746e08d7 | 2249 | ret = cmd_register_trigger(&cmd_creds, payload_trigger, |
0efb2ad7 | 2250 | cmd_ctx->lsm.u.trigger.is_trigger_anonymous, |
412d7227 SM |
2251 | the_notification_thread_handle, |
2252 | &return_trigger); | |
242388e4 | 2253 | if (ret != LTTNG_OK) { |
746e08d7 | 2254 | lttng_trigger_put(payload_trigger); |
242388e4 JR |
2255 | goto error; |
2256 | } | |
2257 | ||
2258 | ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload); | |
746e08d7 JG |
2259 | lttng_trigger_put(payload_trigger); |
2260 | lttng_trigger_put(return_trigger); | |
242388e4 JR |
2261 | if (ret) { |
2262 | ERR("Failed to serialize trigger in reply to \"register trigger\" command"); | |
2263 | ret = LTTNG_ERR_NOMEM; | |
242388e4 JR |
2264 | goto error; |
2265 | } | |
2266 | ||
746e08d7 JG |
2267 | reply_payload_size = cmd_ctx->reply_payload.buffer.size - |
2268 | original_reply_payload_size; | |
242388e4 | 2269 | |
746e08d7 | 2270 | update_lttng_msg(cmd_ctx, 0, reply_payload_size); |
242388e4 JR |
2271 | |
2272 | ret = LTTNG_OK; | |
917a718d JG |
2273 | break; |
2274 | } | |
2275 | case LTTNG_UNREGISTER_TRIGGER: | |
2276 | { | |
746e08d7 JG |
2277 | struct lttng_trigger *payload_trigger; |
2278 | const struct lttng_credentials cmd_creds = { | |
2279 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2280 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2281 | }; | |
2282 | ||
2283 | ret = receive_lttng_trigger( | |
2284 | cmd_ctx, *sock, sock_error, &payload_trigger); | |
2285 | if (ret != LTTNG_OK) { | |
2286 | goto error; | |
2287 | } | |
2288 | ||
2289 | ret = cmd_unregister_trigger(&cmd_creds, payload_trigger, | |
412d7227 | 2290 | the_notification_thread_handle); |
746e08d7 | 2291 | lttng_trigger_put(payload_trigger); |
917a718d JG |
2292 | break; |
2293 | } | |
2294 | case LTTNG_ROTATE_SESSION: | |
2295 | { | |
2296 | struct lttng_rotate_session_return rotate_return; | |
2297 | ||
2298 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
2299 | ||
2300 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
2301 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2302 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2303 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2304 | goto error; | |
2305 | } | |
2306 | ||
7fdbed1c | 2307 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
343defc2 MD |
2308 | false, |
2309 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
917a718d JG |
2310 | if (ret < 0) { |
2311 | ret = -ret; | |
2312 | goto error; | |
2313 | } | |
2314 | ||
2315 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
2316 | sizeof(rotate_return)); | |
2317 | if (ret < 0) { | |
2318 | ret = -ret; | |
2319 | goto error; | |
2320 | } | |
2321 | ||
2322 | ret = LTTNG_OK; | |
2323 | break; | |
2324 | } | |
2325 | case LTTNG_ROTATION_GET_INFO: | |
2326 | { | |
2327 | struct lttng_rotation_get_info_return get_info_return; | |
2328 | ||
2329 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
2330 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
3a91de3a | 2331 | cmd_ctx->lsm.u.get_rotation_info.rotation_id); |
917a718d JG |
2332 | if (ret < 0) { |
2333 | ret = -ret; | |
2334 | goto error; | |
2335 | } | |
2336 | ||
2337 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
2338 | sizeof(get_info_return)); | |
2339 | if (ret < 0) { | |
2340 | ret = -ret; | |
2341 | goto error; | |
2342 | } | |
2343 | ||
2344 | ret = LTTNG_OK; | |
2345 | break; | |
2346 | } | |
2347 | case LTTNG_ROTATION_SET_SCHEDULE: | |
2348 | { | |
2349 | bool set_schedule; | |
2350 | enum lttng_rotation_schedule_type schedule_type; | |
2351 | uint64_t value; | |
2352 | ||
2353 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2354 | DBG("Kernel tracer version does not support session rotations"); | |
2355 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2356 | goto error; | |
2357 | } | |
2358 | ||
3a91de3a JG |
2359 | set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1; |
2360 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type; | |
2361 | value = cmd_ctx->lsm.u.rotation_set_schedule.value; | |
917a718d | 2362 | |
412d7227 SM |
2363 | ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule, |
2364 | schedule_type, value, | |
2365 | the_notification_thread_handle); | |
917a718d JG |
2366 | if (ret != LTTNG_OK) { |
2367 | goto error; | |
2368 | } | |
2369 | ||
2370 | break; | |
2371 | } | |
2372 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
2373 | { | |
2374 | struct lttng_session_list_schedules_return schedules = { | |
2375 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
2376 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
2377 | .size.set = !!cmd_ctx->session->rotate_size, | |
2378 | .size.value = cmd_ctx->session->rotate_size, | |
2379 | }; | |
2380 | ||
2381 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
2382 | sizeof(schedules)); | |
2383 | if (ret < 0) { | |
2384 | ret = -ret; | |
2385 | goto error; | |
2386 | } | |
2387 | ||
2388 | ret = LTTNG_OK; | |
2389 | break; | |
2390 | } | |
022349df MD |
2391 | case LTTNG_CLEAR_SESSION: |
2392 | { | |
2393 | ret = cmd_clear_session(cmd_ctx->session, sock); | |
2394 | break; | |
2395 | } | |
fbc9f37d JR |
2396 | case LTTNG_LIST_TRIGGERS: |
2397 | { | |
2398 | struct lttng_triggers *return_triggers = NULL; | |
2399 | size_t original_payload_size; | |
2400 | size_t payload_size; | |
2401 | ||
2402 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2403 | if (ret) { | |
2404 | ret = LTTNG_ERR_NOMEM; | |
2405 | goto setup_error; | |
2406 | } | |
2407 | ||
2408 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2409 | ||
412d7227 SM |
2410 | ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle, |
2411 | &return_triggers); | |
fbc9f37d JR |
2412 | if (ret != LTTNG_OK) { |
2413 | goto error; | |
2414 | } | |
2415 | ||
2416 | assert(return_triggers); | |
2417 | ret = lttng_triggers_serialize( | |
2418 | return_triggers, &cmd_ctx->reply_payload); | |
2419 | lttng_triggers_destroy(return_triggers); | |
2420 | if (ret) { | |
2421 | ERR("Failed to serialize triggers in reply to `list triggers` command"); | |
2422 | ret = LTTNG_ERR_NOMEM; | |
2423 | goto error; | |
2424 | } | |
2425 | ||
2426 | payload_size = cmd_ctx->reply_payload.buffer.size - | |
2427 | original_payload_size; | |
2428 | ||
2429 | update_lttng_msg(cmd_ctx, 0, payload_size); | |
2430 | ||
2431 | ret = LTTNG_OK; | |
2432 | break; | |
2433 | } | |
588c4b0d JG |
2434 | case LTTNG_EXECUTE_ERROR_QUERY: |
2435 | { | |
2436 | struct lttng_error_query *query; | |
2437 | const struct lttng_credentials cmd_creds = { | |
2438 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2439 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2440 | }; | |
2441 | struct lttng_error_query_results *results = NULL; | |
2442 | size_t original_payload_size; | |
2443 | size_t payload_size; | |
2444 | ||
2445 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2446 | if (ret) { | |
2447 | ret = LTTNG_ERR_NOMEM; | |
2448 | goto setup_error; | |
2449 | } | |
2450 | ||
2451 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2452 | ||
2453 | ret = receive_lttng_error_query( | |
2454 | cmd_ctx, *sock, sock_error, &query); | |
2455 | if (ret != LTTNG_OK) { | |
2456 | goto error; | |
2457 | } | |
2458 | ||
2459 | ret = cmd_execute_error_query(&cmd_creds, query, &results, | |
2460 | the_notification_thread_handle); | |
2461 | lttng_error_query_destroy(query); | |
2462 | if (ret != LTTNG_OK) { | |
2463 | goto error; | |
2464 | } | |
2465 | ||
2466 | assert(results); | |
2467 | ret = lttng_error_query_results_serialize( | |
2468 | results, &cmd_ctx->reply_payload); | |
2469 | lttng_error_query_results_destroy(results); | |
2470 | if (ret) { | |
2471 | ERR("Failed to serialize error query result set in reply to `execute error query` command"); | |
2472 | ret = LTTNG_ERR_NOMEM; | |
2473 | goto error; | |
2474 | } | |
2475 | ||
2476 | payload_size = cmd_ctx->reply_payload.buffer.size - | |
2477 | original_payload_size; | |
2478 | ||
2479 | update_lttng_msg(cmd_ctx, 0, payload_size); | |
2480 | ||
2481 | ret = LTTNG_OK; | |
2482 | ||
2483 | break; | |
2484 | } | |
917a718d JG |
2485 | default: |
2486 | ret = LTTNG_ERR_UND; | |
2487 | break; | |
2488 | } | |
2489 | ||
2490 | error: | |
3a91de3a JG |
2491 | if (cmd_ctx->reply_payload.buffer.size == 0) { |
2492 | DBG("Missing llm header, creating one."); | |
917a718d JG |
2493 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
2494 | goto setup_error; | |
2495 | } | |
2496 | } | |
2497 | /* Set return code */ | |
3a91de3a | 2498 | ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret; |
917a718d JG |
2499 | setup_error: |
2500 | if (cmd_ctx->session) { | |
2501 | session_unlock(cmd_ctx->session); | |
2502 | session_put(cmd_ctx->session); | |
3e3665b8 | 2503 | cmd_ctx->session = NULL; |
917a718d JG |
2504 | } |
2505 | if (need_tracing_session) { | |
2506 | session_unlock_list(); | |
2507 | } | |
2508 | init_setup_error: | |
2509 | assert(!rcu_read_ongoing()); | |
2510 | return ret; | |
2511 | } | |
2512 | ||
2513 | static int create_client_sock(void) | |
2514 | { | |
2515 | int ret, client_sock; | |
2516 | const mode_t old_umask = umask(0); | |
2517 | ||
2518 | /* Create client tool unix socket */ | |
412d7227 SM |
2519 | client_sock = lttcomm_create_unix_sock( |
2520 | the_config.client_unix_sock_path.value); | |
917a718d | 2521 | if (client_sock < 0) { |
412d7227 SM |
2522 | ERR("Create unix sock failed: %s", |
2523 | the_config.client_unix_sock_path.value); | |
917a718d JG |
2524 | ret = -1; |
2525 | goto end; | |
2526 | } | |
2527 | ||
2528 | /* Set the cloexec flag */ | |
2529 | ret = utils_set_fd_cloexec(client_sock); | |
2530 | if (ret < 0) { | |
2531 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
2532 | "Continuing but note that the consumer daemon will have a " | |
2533 | "reference to this socket on exec()", client_sock); | |
2534 | } | |
2535 | ||
2536 | /* File permission MUST be 660 */ | |
412d7227 SM |
2537 | ret = chmod(the_config.client_unix_sock_path.value, |
2538 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
917a718d | 2539 | if (ret < 0) { |
18972083 | 2540 | ERR("Set file permissions failed: %s", |
412d7227 | 2541 | the_config.client_unix_sock_path.value); |
917a718d | 2542 | PERROR("chmod"); |
18972083 JR |
2543 | (void) lttcomm_close_unix_sock(client_sock); |
2544 | ret = -1; | |
917a718d JG |
2545 | goto end; |
2546 | } | |
2547 | DBG("Created client socket (fd = %i)", client_sock); | |
2548 | ret = client_sock; | |
2549 | end: | |
2550 | umask(old_umask); | |
2551 | return ret; | |
2552 | } | |
2553 | ||
2554 | static void cleanup_client_thread(void *data) | |
2555 | { | |
2556 | struct lttng_pipe *quit_pipe = data; | |
2557 | ||
2558 | lttng_pipe_destroy(quit_pipe); | |
2559 | } | |
2560 | ||
6cb45e93 JG |
2561 | static void thread_init_cleanup(void *data) |
2562 | { | |
2563 | set_thread_status(false); | |
2564 | } | |
2565 | ||
917a718d JG |
2566 | /* |
2567 | * This thread manage all clients request using the unix client socket for | |
2568 | * communication. | |
2569 | */ | |
2570 | static void *thread_manage_clients(void *data) | |
2571 | { | |
2572 | int sock = -1, ret, i, pollfd, err = -1; | |
2573 | int sock_error; | |
2574 | uint32_t revents, nb_fd; | |
917a718d | 2575 | struct lttng_poll_event events; |
0f68efb6 | 2576 | const int client_sock = thread_state.client_sock; |
917a718d JG |
2577 | struct lttng_pipe *quit_pipe = data; |
2578 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
3a91de3a | 2579 | struct command_ctx cmd_ctx = {}; |
917a718d JG |
2580 | |
2581 | DBG("[thread] Manage client started"); | |
2582 | ||
3a91de3a JG |
2583 | lttng_payload_init(&cmd_ctx.reply_payload); |
2584 | ||
917a718d JG |
2585 | is_root = (getuid() == 0); |
2586 | ||
6cb45e93 | 2587 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2588 | |
2589 | rcu_register_thread(); | |
2590 | ||
412d7227 | 2591 | health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
917a718d JG |
2592 | |
2593 | health_code_update(); | |
2594 | ||
2595 | ret = lttcomm_listen_unix_sock(client_sock); | |
2596 | if (ret < 0) { | |
2597 | goto error_listen; | |
2598 | } | |
2599 | ||
2600 | /* | |
2601 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2602 | * more will be added to this poll set. | |
2603 | */ | |
2604 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2605 | if (ret < 0) { | |
2606 | goto error_create_poll; | |
2607 | } | |
2608 | ||
2609 | /* Add the application registration socket */ | |
2610 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2611 | if (ret < 0) { | |
2612 | goto error; | |
2613 | } | |
2614 | ||
2615 | /* Add thread quit pipe */ | |
2616 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2617 | if (ret < 0) { | |
2618 | goto error; | |
2619 | } | |
2620 | ||
6cb45e93 | 2621 | /* Set state as running. */ |
0d163d56 | 2622 | set_thread_status(true); |
6cb45e93 JG |
2623 | pthread_cleanup_pop(0); |
2624 | ||
917a718d JG |
2625 | /* This testpoint is after we signal readiness to the parent. */ |
2626 | if (testpoint(sessiond_thread_manage_clients)) { | |
2627 | goto error; | |
2628 | } | |
2629 | ||
2630 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2631 | goto error; | |
2632 | } | |
2633 | ||
2634 | health_code_update(); | |
2635 | ||
917a718d JG |
2636 | while (1) { |
2637 | const struct cmd_completion_handler *cmd_completion_handler; | |
2638 | ||
3a91de3a JG |
2639 | cmd_ctx.creds = (lttng_sock_cred) { |
2640 | .uid = UINT32_MAX, | |
2641 | .gid = UINT32_MAX, | |
2642 | }; | |
2643 | cmd_ctx.session = NULL; | |
fe489250 | 2644 | lttng_payload_clear(&cmd_ctx.reply_payload); |
e368fb43 | 2645 | cmd_ctx.lttng_msg_size = 0; |
3a91de3a | 2646 | |
917a718d JG |
2647 | DBG("Accepting client command ..."); |
2648 | ||
2649 | /* Inifinite blocking call, waiting for transmission */ | |
2650 | restart: | |
2651 | health_poll_entry(); | |
2652 | ret = lttng_poll_wait(&events, -1); | |
2653 | health_poll_exit(); | |
2654 | if (ret < 0) { | |
2655 | /* | |
2656 | * Restart interrupted system call. | |
2657 | */ | |
2658 | if (errno == EINTR) { | |
2659 | goto restart; | |
2660 | } | |
2661 | goto error; | |
2662 | } | |
2663 | ||
2664 | nb_fd = ret; | |
2665 | ||
2666 | for (i = 0; i < nb_fd; i++) { | |
2667 | revents = LTTNG_POLL_GETEV(&events, i); | |
2668 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2669 | ||
2670 | health_code_update(); | |
2671 | ||
917a718d JG |
2672 | if (pollfd == thread_quit_pipe_fd) { |
2673 | err = 0; | |
2674 | goto exit; | |
2675 | } else { | |
2676 | /* Event on the registration socket */ | |
2677 | if (revents & LPOLLIN) { | |
2678 | continue; | |
2679 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2680 | ERR("Client socket poll error"); | |
2681 | goto error; | |
2682 | } else { | |
2683 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2684 | goto error; | |
2685 | } | |
2686 | } | |
2687 | } | |
2688 | ||
2689 | DBG("Wait for client response"); | |
2690 | ||
2691 | health_code_update(); | |
2692 | ||
2693 | sock = lttcomm_accept_unix_sock(client_sock); | |
2694 | if (sock < 0) { | |
2695 | goto error; | |
2696 | } | |
2697 | ||
2698 | /* | |
2699 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2700 | * show must go on. | |
2701 | */ | |
2702 | (void) utils_set_fd_cloexec(sock); | |
2703 | ||
2704 | /* Set socket option for credentials retrieval */ | |
2705 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2706 | if (ret < 0) { | |
2707 | goto error; | |
2708 | } | |
2709 | ||
917a718d JG |
2710 | health_code_update(); |
2711 | ||
2712 | /* | |
2713 | * Data is received from the lttng client. The struct | |
2714 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2715 | * the client. | |
2716 | */ | |
2717 | DBG("Receiving data from client ..."); | |
3a91de3a JG |
2718 | ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm, |
2719 | sizeof(struct lttcomm_session_msg), &cmd_ctx.creds); | |
2720 | if (ret != sizeof(struct lttcomm_session_msg)) { | |
2721 | DBG("Incomplete recv() from client... continuing"); | |
917a718d JG |
2722 | ret = close(sock); |
2723 | if (ret) { | |
2724 | PERROR("close"); | |
2725 | } | |
2726 | sock = -1; | |
917a718d JG |
2727 | continue; |
2728 | } | |
2729 | ||
2730 | health_code_update(); | |
2731 | ||
2732 | // TODO: Validate cmd_ctx including sanity check for | |
2733 | // security purpose. | |
2734 | ||
2735 | rcu_thread_online(); | |
2736 | /* | |
2737 | * This function dispatch the work to the kernel or userspace tracer | |
2738 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2739 | * informations for the client. The command context struct contains | |
2740 | * everything this function may needs. | |
2741 | */ | |
3a91de3a | 2742 | ret = process_client_msg(&cmd_ctx, &sock, &sock_error); |
917a718d JG |
2743 | rcu_thread_offline(); |
2744 | if (ret < 0) { | |
3e3665b8 JG |
2745 | if (sock >= 0) { |
2746 | ret = close(sock); | |
2747 | if (ret) { | |
2748 | PERROR("close"); | |
2749 | } | |
4a76dfd3 JR |
2750 | } |
2751 | sock = -1; | |
917a718d JG |
2752 | /* |
2753 | * TODO: Inform client somehow of the fatal error. At | |
2754 | * this point, ret < 0 means that a zmalloc failed | |
2755 | * (ENOMEM). Error detected but still accept | |
2756 | * command, unless a socket error has been | |
2757 | * detected. | |
2758 | */ | |
917a718d JG |
2759 | continue; |
2760 | } | |
2761 | ||
c7e9ffbd | 2762 | if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) { |
7e397c55 FD |
2763 | WARN("Command returned an invalid status code, returning unknown error: " |
2764 | "command type = %s (%d), ret = %d", | |
2765 | lttcomm_sessiond_command_str(cmd_ctx.lsm.cmd_type), | |
2766 | cmd_ctx.lsm.cmd_type, ret); | |
c7e9ffbd JG |
2767 | ret = LTTNG_ERR_UNK; |
2768 | } | |
2769 | ||
917a718d JG |
2770 | cmd_completion_handler = cmd_pop_completion_handler(); |
2771 | if (cmd_completion_handler) { | |
2772 | enum lttng_error_code completion_code; | |
2773 | ||
2774 | completion_code = cmd_completion_handler->run( | |
2775 | cmd_completion_handler->data); | |
2776 | if (completion_code != LTTNG_OK) { | |
917a718d JG |
2777 | continue; |
2778 | } | |
2779 | } | |
2780 | ||
2781 | health_code_update(); | |
2782 | ||
3e3665b8 | 2783 | if (sock >= 0) { |
3a91de3a JG |
2784 | struct lttng_payload_view view = |
2785 | lttng_payload_view_from_payload( | |
2786 | &cmd_ctx.reply_payload, | |
2787 | 0, -1); | |
e368fb43 | 2788 | struct lttcomm_lttng_msg *llm = (typeof( |
3a91de3a JG |
2789 | llm)) cmd_ctx.reply_payload.buffer.data; |
2790 | ||
37f3c202 | 2791 | assert(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm)); |
3a91de3a JG |
2792 | assert(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size); |
2793 | ||
fe489250 | 2794 | llm->fd_count = lttng_payload_view_get_fd_handle_count(&view); |
e368fb43 | 2795 | |
3e3665b8 | 2796 | DBG("Sending response (size: %d, retcode: %s (%d))", |
3a91de3a JG |
2797 | cmd_ctx.lttng_msg_size, |
2798 | lttng_strerror(-llm->ret_code), | |
2799 | llm->ret_code); | |
2800 | ret = send_unix_sock(sock, &view); | |
3e3665b8 JG |
2801 | if (ret < 0) { |
2802 | ERR("Failed to send data back to client"); | |
2803 | } | |
917a718d | 2804 | |
3e3665b8 JG |
2805 | /* End of transmission */ |
2806 | ret = close(sock); | |
2807 | if (ret) { | |
2808 | PERROR("close"); | |
2809 | } | |
4a76dfd3 JR |
2810 | } |
2811 | sock = -1; | |
917a718d | 2812 | |
917a718d JG |
2813 | health_code_update(); |
2814 | } | |
2815 | ||
2816 | exit: | |
2817 | error: | |
2818 | if (sock >= 0) { | |
2819 | ret = close(sock); | |
2820 | if (ret) { | |
2821 | PERROR("close"); | |
2822 | } | |
2823 | } | |
2824 | ||
2825 | lttng_poll_clean(&events); | |
917a718d JG |
2826 | |
2827 | error_listen: | |
2828 | error_create_poll: | |
412d7227 | 2829 | unlink(the_config.client_unix_sock_path.value); |
0f68efb6 JG |
2830 | ret = close(client_sock); |
2831 | if (ret) { | |
2832 | PERROR("close"); | |
917a718d JG |
2833 | } |
2834 | ||
2835 | if (err) { | |
2836 | health_error(); | |
2837 | ERR("Health error occurred in %s", __func__); | |
2838 | } | |
2839 | ||
412d7227 | 2840 | health_unregister(the_health_sessiond); |
917a718d JG |
2841 | |
2842 | DBG("Client thread dying"); | |
3a91de3a | 2843 | lttng_payload_reset(&cmd_ctx.reply_payload); |
917a718d | 2844 | rcu_unregister_thread(); |
917a718d JG |
2845 | return NULL; |
2846 | } | |
2847 | ||
2848 | static | |
2849 | bool shutdown_client_thread(void *thread_data) | |
2850 | { | |
2851 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2852 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2853 | ||
2854 | return notify_thread_pipe(write_fd) == 1; | |
2855 | } | |
2856 | ||
2857 | struct lttng_thread *launch_client_thread(void) | |
2858 | { | |
6cb45e93 | 2859 | bool thread_running; |
917a718d | 2860 | struct lttng_pipe *client_quit_pipe; |
0f68efb6 JG |
2861 | struct lttng_thread *thread = NULL; |
2862 | int client_sock_fd = -1; | |
917a718d | 2863 | |
6cb45e93 | 2864 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2865 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2866 | if (!client_quit_pipe) { | |
2867 | goto error; | |
2868 | } | |
2869 | ||
0f68efb6 JG |
2870 | client_sock_fd = create_client_sock(); |
2871 | if (client_sock_fd < 0) { | |
2872 | goto error; | |
2873 | } | |
2874 | ||
2875 | thread_state.client_sock = client_sock_fd; | |
917a718d JG |
2876 | thread = lttng_thread_create("Client management", |
2877 | thread_manage_clients, | |
2878 | shutdown_client_thread, | |
2879 | cleanup_client_thread, | |
2880 | client_quit_pipe); | |
2881 | if (!thread) { | |
2882 | goto error; | |
2883 | } | |
0f68efb6 JG |
2884 | /* The client thread now owns the client sock fd and the quit pipe. */ |
2885 | client_sock_fd = -1; | |
2886 | client_quit_pipe = NULL; | |
917a718d JG |
2887 | |
2888 | /* | |
2889 | * This thread is part of the threads that need to be fully | |
2890 | * initialized before the session daemon is marked as "ready". | |
2891 | */ | |
6cb45e93 JG |
2892 | thread_running = wait_thread_status(); |
2893 | if (!thread_running) { | |
0f68efb6 | 2894 | goto error; |
6cb45e93 | 2895 | } |
917a718d JG |
2896 | return thread; |
2897 | error: | |
0f68efb6 JG |
2898 | if (client_sock_fd >= 0) { |
2899 | if (close(client_sock_fd)) { | |
2900 | PERROR("Failed to close client socket"); | |
2901 | } | |
2902 | } | |
2903 | lttng_thread_put(thread); | |
917a718d JG |
2904 | cleanup_client_thread(client_quit_pipe); |
2905 | return NULL; | |
2906 | } |