Commit | Line | Data |
---|---|---|
917a718d | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa MJ |
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 | ||
28ab034a JG |
10 | #include "agent-thread.hpp" |
11 | #include "clear.hpp" | |
12 | #include "client.hpp" | |
13 | #include "cmd.hpp" | |
c9e313bc SM |
14 | #include "common/buffer-view.hpp" |
15 | #include "common/compat/socket.hpp" | |
16 | #include "common/dynamic-array.hpp" | |
17 | #include "common/dynamic-buffer.hpp" | |
18 | #include "common/fd-handle.hpp" | |
19 | #include "common/payload-view.hpp" | |
20 | #include "common/payload.hpp" | |
21 | #include "common/sessiond-comm/sessiond-comm.hpp" | |
28ab034a JG |
22 | #include "health-sessiond.hpp" |
23 | #include "kernel.hpp" | |
24 | #include "lttng-sessiond.hpp" | |
159b042f JG |
25 | #include "lttng/lttng-error.h" |
26 | #include "lttng/tracker.h" | |
28ab034a JG |
27 | #include "manage-consumer.hpp" |
28 | #include "save.hpp" | |
29 | #include "testpoint.hpp" | |
30 | #include "utils.hpp" | |
31 | ||
c9e313bc | 32 | #include <common/compat/getenv.hpp> |
dd7ef124 | 33 | #include <common/exception.hpp> |
c9e313bc SM |
34 | #include <common/tracker.hpp> |
35 | #include <common/unix.hpp> | |
36 | #include <common/utils.hpp> | |
28ab034a | 37 | |
c9e313bc SM |
38 | #include <lttng/error-query-internal.hpp> |
39 | #include <lttng/event-internal.hpp> | |
40 | #include <lttng/session-descriptor-internal.hpp> | |
41 | #include <lttng/session-internal.hpp> | |
42 | #include <lttng/userspace-probe-internal.hpp> | |
28ab034a | 43 | |
671e39d7 | 44 | #include <fcntl.h> |
159b042f JG |
45 | #include <pthread.h> |
46 | #include <signal.h> | |
47 | #include <stddef.h> | |
999af9c1 | 48 | #include <stdint.h> |
159b042f | 49 | #include <sys/stat.h> |
1434fd36 | 50 | #include <unistd.h> |
917a718d | 51 | |
f1494934 JG |
52 | namespace { |
53 | bool is_root; | |
917a718d | 54 | |
f1494934 | 55 | struct thread_state { |
6cb45e93 JG |
56 | sem_t ready; |
57 | bool running; | |
0f68efb6 | 58 | int client_sock; |
6cb45e93 | 59 | } thread_state; |
f1494934 | 60 | } /* namespace */ |
6cb45e93 JG |
61 | |
62 | static void set_thread_status(bool running) | |
917a718d | 63 | { |
6cb45e93 JG |
64 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
65 | thread_state.running = running; | |
66 | sem_post(&thread_state.ready); | |
917a718d JG |
67 | } |
68 | ||
cd9adb8b | 69 | static bool wait_thread_status() |
917a718d | 70 | { |
6cb45e93 JG |
71 | DBG("Waiting for client thread to be ready"); |
72 | sem_wait(&thread_state.ready); | |
73 | if (thread_state.running) { | |
74 | DBG("Client thread is ready"); | |
75 | } else { | |
76 | ERR("Initialization of client thread failed"); | |
917a718d | 77 | } |
6cb45e93 JG |
78 | |
79 | return thread_state.running; | |
917a718d JG |
80 | } |
81 | ||
82 | /* | |
83 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
84 | * right amount of memory and copying the original information from the lsm | |
85 | * structure. | |
86 | * | |
87 | * Return 0 on success, negative value on error. | |
88 | */ | |
89 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
28ab034a JG |
90 | const void *payload_buf, |
91 | size_t payload_len, | |
92 | const void *cmd_header_buf, | |
93 | size_t cmd_header_len) | |
917a718d JG |
94 | { |
95 | int ret = 0; | |
96 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
917a718d | 97 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; |
28ab034a | 98 | lttcomm_lttng_msg llm{}; |
7966af57 SM |
99 | |
100 | llm.cmd_type = cmd_ctx->lsm.cmd_type; | |
101 | llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid; | |
102 | llm.cmd_header_size = (uint32_t) cmd_header_len; | |
103 | llm.data_size = (uint32_t) payload_len; | |
917a718d | 104 | |
2eb1b01f JR |
105 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
106 | if (ret) { | |
107 | goto end; | |
108 | } | |
109 | ||
fe489250 | 110 | lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles); |
917a718d | 111 | |
3a91de3a JG |
112 | cmd_ctx->lttng_msg_size = total_msg_size; |
113 | ||
114 | /* Append reply header. */ | |
28ab034a | 115 | ret = lttng_dynamic_buffer_append(&cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); |
3a91de3a | 116 | if (ret) { |
917a718d JG |
117 | goto end; |
118 | } | |
119 | ||
3a91de3a | 120 | /* Append command header. */ |
917a718d | 121 | if (cmd_header_len) { |
3a91de3a | 122 | ret = lttng_dynamic_buffer_append( |
28ab034a | 123 | &cmd_ctx->reply_payload.buffer, cmd_header_buf, cmd_header_len); |
3a91de3a JG |
124 | if (ret) { |
125 | goto end; | |
126 | } | |
917a718d JG |
127 | } |
128 | ||
3a91de3a | 129 | /* Append payload. */ |
917a718d | 130 | if (payload_len) { |
3a91de3a | 131 | ret = lttng_dynamic_buffer_append( |
28ab034a | 132 | &cmd_ctx->reply_payload.buffer, payload_buf, payload_len); |
3a91de3a JG |
133 | if (ret) { |
134 | goto end; | |
135 | } | |
917a718d JG |
136 | } |
137 | ||
138 | end: | |
139 | return ret; | |
140 | } | |
141 | ||
e368fb43 JG |
142 | static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx) |
143 | { | |
144 | int ret; | |
145 | const struct lttcomm_lttng_msg llm = {}; | |
146 | ||
64defc29 JR |
147 | ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0); |
148 | if (ret) { | |
149 | goto end; | |
150 | } | |
e368fb43 JG |
151 | |
152 | /* Append place-holder reply header. */ | |
28ab034a | 153 | ret = lttng_dynamic_buffer_append(&cmd_ctx->reply_payload.buffer, &llm, sizeof(llm)); |
e368fb43 JG |
154 | if (ret) { |
155 | goto end; | |
156 | } | |
157 | ||
158 | cmd_ctx->lttng_msg_size = sizeof(llm); | |
159 | end: | |
160 | return ret; | |
161 | } | |
162 | ||
28ab034a | 163 | static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len, size_t payload_len) |
e368fb43 JG |
164 | { |
165 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
166 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
e368fb43 | 167 | struct lttcomm_lttng_msg *p_llm; |
28ab034a | 168 | lttcomm_lttng_msg llm{}; |
7966af57 SM |
169 | |
170 | llm.cmd_type = cmd_ctx->lsm.cmd_type; | |
171 | llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid; | |
172 | llm.cmd_header_size = (uint32_t) cmd_header_len; | |
173 | llm.data_size = (uint32_t) payload_len; | |
e368fb43 | 174 | |
a0377dfe | 175 | LTTNG_ASSERT(cmd_ctx->reply_payload.buffer.size >= sizeof(llm)); |
e368fb43 JG |
176 | |
177 | p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data; | |
178 | ||
179 | /* Update existing header. */ | |
180 | memcpy(p_llm, &llm, sizeof(llm)); | |
181 | ||
182 | cmd_ctx->lttng_msg_size = total_msg_size; | |
183 | } | |
184 | ||
917a718d JG |
185 | /* |
186 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 187 | * exec or it will fail. |
917a718d JG |
188 | */ |
189 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
190 | { | |
4ec029ed | 191 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
192 | } |
193 | ||
194 | /* | |
195 | * Fork and exec a consumer daemon (consumerd). | |
196 | * | |
197 | * Return pid if successful else -1. | |
198 | */ | |
199 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
200 | { | |
201 | int ret; | |
202 | pid_t pid; | |
203 | const char *consumer_to_use; | |
204 | const char *verbosity; | |
205 | struct stat st; | |
206 | ||
207 | DBG("Spawning consumerd"); | |
208 | ||
209 | pid = fork(); | |
210 | if (pid == 0) { | |
211 | /* | |
212 | * Exec consumerd. | |
213 | */ | |
412d7227 | 214 | if (the_config.verbose_consumer) { |
917a718d JG |
215 | verbosity = "--verbose"; |
216 | } else if (lttng_opt_quiet) { | |
217 | verbosity = "--quiet"; | |
218 | } else { | |
219 | verbosity = ""; | |
220 | } | |
221 | ||
222 | switch (consumer_data->type) { | |
223 | case LTTNG_CONSUMER_KERNEL: | |
224 | /* | |
225 | * Find out which consumerd to execute. We will first try the | |
226 | * 64-bit path, then the sessiond's installation directory, and | |
227 | * fallback on the 32-bit one, | |
228 | */ | |
229 | DBG3("Looking for a kernel consumer at these locations:"); | |
28ab034a | 230 | DBG3(" 1) %s", the_config.consumerd64_bin_path.value ?: "NULL"); |
917a718d | 231 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
28ab034a | 232 | DBG3(" 3) %s", the_config.consumerd32_bin_path.value ?: "NULL"); |
412d7227 | 233 | if (stat(the_config.consumerd64_bin_path.value, &st) == 0) { |
917a718d | 234 | DBG3("Found location #1"); |
412d7227 | 235 | consumer_to_use = the_config.consumerd64_bin_path.value; |
917a718d JG |
236 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { |
237 | DBG3("Found location #2"); | |
238 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
412d7227 | 239 | } else if (the_config.consumerd32_bin_path.value && |
28ab034a | 240 | stat(the_config.consumerd32_bin_path.value, &st) == 0) { |
917a718d | 241 | DBG3("Found location #3"); |
412d7227 | 242 | consumer_to_use = the_config.consumerd32_bin_path.value; |
917a718d JG |
243 | } else { |
244 | DBG("Could not find any valid consumerd executable"); | |
245 | ret = -EINVAL; | |
246 | goto error; | |
247 | } | |
28ab034a JG |
248 | DBG("Using kernel consumer at: %s", consumer_to_use); |
249 | (void) execl(consumer_to_use, | |
250 | "lttng-consumerd", | |
251 | verbosity, | |
252 | "-k", | |
253 | "--consumerd-cmd-sock", | |
254 | consumer_data->cmd_unix_sock_path, | |
255 | "--consumerd-err-sock", | |
256 | consumer_data->err_unix_sock_path, | |
257 | "--group", | |
258 | the_config.tracing_group_name.value, | |
259 | NULL); | |
917a718d JG |
260 | break; |
261 | case LTTNG_CONSUMER64_UST: | |
262 | { | |
412d7227 | 263 | if (the_config.consumerd64_lib_dir.value) { |
b53d4e59 | 264 | const char *tmp; |
917a718d JG |
265 | size_t tmplen; |
266 | char *tmpnew; | |
267 | ||
268 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
269 | if (!tmp) { | |
270 | tmp = ""; | |
271 | } | |
28ab034a JG |
272 | tmplen = strlen(the_config.consumerd64_lib_dir.value) + 1 /* : */ + |
273 | strlen(tmp); | |
64803277 | 274 | tmpnew = zmalloc<char>(tmplen + 1 /* \0 */); |
917a718d JG |
275 | if (!tmpnew) { |
276 | ret = -ENOMEM; | |
277 | goto error; | |
278 | } | |
412d7227 | 279 | strcat(tmpnew, the_config.consumerd64_lib_dir.value); |
917a718d JG |
280 | if (tmp[0] != '\0') { |
281 | strcat(tmpnew, ":"); | |
282 | strcat(tmpnew, tmp); | |
283 | } | |
284 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
285 | free(tmpnew); | |
286 | if (ret) { | |
287 | ret = -errno; | |
288 | goto error; | |
289 | } | |
290 | } | |
412d7227 | 291 | DBG("Using 64-bit UST consumer at: %s", |
28ab034a | 292 | the_config.consumerd64_bin_path.value); |
412d7227 | 293 | (void) execl(the_config.consumerd64_bin_path.value, |
28ab034a JG |
294 | "lttng-consumerd", |
295 | verbosity, | |
296 | "-u", | |
297 | "--consumerd-cmd-sock", | |
298 | consumer_data->cmd_unix_sock_path, | |
299 | "--consumerd-err-sock", | |
300 | consumer_data->err_unix_sock_path, | |
301 | "--group", | |
302 | the_config.tracing_group_name.value, | |
303 | NULL); | |
917a718d JG |
304 | break; |
305 | } | |
306 | case LTTNG_CONSUMER32_UST: | |
307 | { | |
412d7227 | 308 | if (the_config.consumerd32_lib_dir.value) { |
b53d4e59 | 309 | const char *tmp; |
917a718d JG |
310 | size_t tmplen; |
311 | char *tmpnew; | |
312 | ||
313 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
314 | if (!tmp) { | |
315 | tmp = ""; | |
316 | } | |
28ab034a JG |
317 | tmplen = strlen(the_config.consumerd32_lib_dir.value) + 1 /* : */ + |
318 | strlen(tmp); | |
64803277 | 319 | tmpnew = zmalloc<char>(tmplen + 1 /* \0 */); |
917a718d JG |
320 | if (!tmpnew) { |
321 | ret = -ENOMEM; | |
322 | goto error; | |
323 | } | |
412d7227 | 324 | strcat(tmpnew, the_config.consumerd32_lib_dir.value); |
917a718d JG |
325 | if (tmp[0] != '\0') { |
326 | strcat(tmpnew, ":"); | |
327 | strcat(tmpnew, tmp); | |
328 | } | |
329 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
330 | free(tmpnew); | |
331 | if (ret) { | |
332 | ret = -errno; | |
333 | goto error; | |
334 | } | |
335 | } | |
412d7227 | 336 | DBG("Using 32-bit UST consumer at: %s", |
28ab034a | 337 | the_config.consumerd32_bin_path.value); |
412d7227 | 338 | (void) execl(the_config.consumerd32_bin_path.value, |
28ab034a JG |
339 | "lttng-consumerd", |
340 | verbosity, | |
341 | "-u", | |
342 | "--consumerd-cmd-sock", | |
343 | consumer_data->cmd_unix_sock_path, | |
344 | "--consumerd-err-sock", | |
345 | consumer_data->err_unix_sock_path, | |
346 | "--group", | |
347 | the_config.tracing_group_name.value, | |
348 | NULL); | |
917a718d JG |
349 | break; |
350 | } | |
351 | default: | |
352 | ERR("unknown consumer type"); | |
353 | errno = 0; | |
354 | } | |
355 | if (errno != 0) { | |
356 | PERROR("Consumer execl()"); | |
357 | } | |
358 | /* Reaching this point, we got a failure on our execl(). */ | |
359 | exit(EXIT_FAILURE); | |
360 | } else if (pid > 0) { | |
361 | ret = pid; | |
362 | } else { | |
363 | PERROR("start consumer fork"); | |
364 | ret = -errno; | |
365 | } | |
366 | error: | |
367 | return ret; | |
368 | } | |
369 | ||
370 | /* | |
371 | * Spawn the consumerd daemon and session daemon thread. | |
372 | */ | |
373 | static int start_consumerd(struct consumer_data *consumer_data) | |
374 | { | |
375 | int ret; | |
376 | ||
377 | /* | |
378 | * Set the listen() state on the socket since there is a possible race | |
379 | * between the exec() of the consumer daemon and this call if place in the | |
380 | * consumer thread. See bug #366 for more details. | |
381 | */ | |
382 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
383 | if (ret < 0) { | |
384 | goto error; | |
385 | } | |
386 | ||
387 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
388 | if (consumer_data->pid != 0) { | |
389 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
390 | goto end; | |
391 | } | |
392 | ||
393 | ret = spawn_consumerd(consumer_data); | |
394 | if (ret < 0) { | |
395 | ERR("Spawning consumerd failed"); | |
396 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
397 | goto error; | |
398 | } | |
399 | ||
400 | /* Setting up the consumer_data pid */ | |
401 | consumer_data->pid = ret; | |
402 | DBG2("Consumer pid %d", consumer_data->pid); | |
403 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
404 | ||
405 | DBG2("Spawning consumer control thread"); | |
406 | ret = spawn_consumer_thread(consumer_data); | |
407 | if (ret < 0) { | |
408 | ERR("Fatal error spawning consumer control thread"); | |
409 | goto error; | |
410 | } | |
411 | ||
412 | end: | |
413 | return 0; | |
414 | ||
415 | error: | |
416 | /* Cleanup already created sockets on error. */ | |
417 | if (consumer_data->err_sock >= 0) { | |
418 | int err; | |
419 | ||
420 | err = close(consumer_data->err_sock); | |
421 | if (err < 0) { | |
422 | PERROR("close consumer data error socket"); | |
423 | } | |
424 | } | |
425 | return ret; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Copy consumer output from the tracing session to the domain session. The | |
430 | * function also applies the right modification on a per domain basis for the | |
431 | * trace files destination directory. | |
917a718d JG |
432 | */ |
433 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
434 | { | |
435 | int ret; | |
436 | const char *dir_name; | |
437 | struct consumer_output *consumer; | |
438 | ||
a0377dfe FD |
439 | LTTNG_ASSERT(session); |
440 | LTTNG_ASSERT(session->consumer); | |
917a718d JG |
441 | |
442 | switch (domain) { | |
443 | case LTTNG_DOMAIN_KERNEL: | |
444 | DBG3("Copying tracing session consumer output in kernel session"); | |
445 | /* | |
446 | * XXX: We should audit the session creation and what this function | |
447 | * does "extra" in order to avoid a destroy since this function is used | |
448 | * in the domain session creation (kernel and ust) only. Same for UST | |
449 | * domain. | |
450 | */ | |
451 | if (session->kernel_session->consumer) { | |
452 | consumer_output_put(session->kernel_session->consumer); | |
453 | } | |
28ab034a | 454 | session->kernel_session->consumer = consumer_copy_output(session->consumer); |
917a718d JG |
455 | /* Ease our life a bit for the next part */ |
456 | consumer = session->kernel_session->consumer; | |
457 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
458 | break; | |
459 | case LTTNG_DOMAIN_JUL: | |
460 | case LTTNG_DOMAIN_LOG4J: | |
461 | case LTTNG_DOMAIN_PYTHON: | |
462 | case LTTNG_DOMAIN_UST: | |
463 | DBG3("Copying tracing session consumer output in UST session"); | |
464 | if (session->ust_session->consumer) { | |
465 | consumer_output_put(session->ust_session->consumer); | |
466 | } | |
28ab034a | 467 | session->ust_session->consumer = consumer_copy_output(session->consumer); |
917a718d JG |
468 | /* Ease our life a bit for the next part */ |
469 | consumer = session->ust_session->consumer; | |
470 | dir_name = DEFAULT_UST_TRACE_DIR; | |
471 | break; | |
472 | default: | |
473 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
474 | goto error; | |
475 | } | |
476 | ||
477 | /* Append correct directory to subdir */ | |
28ab034a | 478 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, sizeof(consumer->domain_subdir)); |
b178f53e JG |
479 | if (ret) { |
480 | ret = LTTNG_ERR_UNK; | |
481 | goto error; | |
482 | } | |
483 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
484 | ret = LTTNG_OK; |
485 | ||
486 | error: | |
487 | return ret; | |
488 | } | |
489 | ||
490 | /* | |
491 | * Create an UST session and add it to the session ust list. | |
917a718d | 492 | */ |
28ab034a | 493 | static int create_ust_session(struct ltt_session *session, const struct lttng_domain *domain) |
917a718d JG |
494 | { |
495 | int ret; | |
cd9adb8b | 496 | struct ltt_ust_session *lus = nullptr; |
917a718d | 497 | |
a0377dfe FD |
498 | LTTNG_ASSERT(session); |
499 | LTTNG_ASSERT(domain); | |
500 | LTTNG_ASSERT(session->consumer); | |
917a718d JG |
501 | |
502 | switch (domain->type) { | |
503 | case LTTNG_DOMAIN_JUL: | |
504 | case LTTNG_DOMAIN_LOG4J: | |
505 | case LTTNG_DOMAIN_PYTHON: | |
506 | case LTTNG_DOMAIN_UST: | |
507 | break; | |
508 | default: | |
509 | ERR("Unknown UST domain on create session %d", domain->type); | |
510 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
511 | goto error; | |
512 | } | |
513 | ||
514 | DBG("Creating UST session"); | |
515 | ||
516 | lus = trace_ust_create_session(session->id); | |
cd9adb8b | 517 | if (lus == nullptr) { |
917a718d JG |
518 | ret = LTTNG_ERR_UST_SESS_FAIL; |
519 | goto error; | |
520 | } | |
521 | ||
522 | lus->uid = session->uid; | |
523 | lus->gid = session->gid; | |
524 | lus->output_traces = session->output_traces; | |
525 | lus->snapshot_mode = session->snapshot_mode; | |
526 | lus->live_timer_interval = session->live_timer; | |
527 | session->ust_session = lus; | |
528 | if (session->shm_path[0]) { | |
28ab034a | 529 | strncpy(lus->root_shm_path, session->shm_path, sizeof(lus->root_shm_path)); |
917a718d | 530 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; |
28ab034a | 531 | strncpy(lus->shm_path, session->shm_path, sizeof(lus->shm_path)); |
917a718d | 532 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; |
28ab034a | 533 | strncat(lus->shm_path, "/ust", sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); |
917a718d JG |
534 | } |
535 | /* Copy session output to the newly created UST session */ | |
536 | ret = copy_session_consumer(domain->type, session); | |
537 | if (ret != LTTNG_OK) { | |
538 | goto error; | |
539 | } | |
540 | ||
541 | return LTTNG_OK; | |
542 | ||
543 | error: | |
544 | free(lus); | |
cd9adb8b | 545 | session->ust_session = nullptr; |
917a718d JG |
546 | return ret; |
547 | } | |
548 | ||
549 | /* | |
550 | * Create a kernel tracer session then create the default channel. | |
551 | */ | |
552 | static int create_kernel_session(struct ltt_session *session) | |
553 | { | |
554 | int ret; | |
555 | ||
556 | DBG("Creating kernel session"); | |
557 | ||
7d268848 | 558 | ret = kernel_create_session(session); |
917a718d JG |
559 | if (ret < 0) { |
560 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 561 | goto error_create; |
917a718d JG |
562 | } |
563 | ||
564 | /* Code flow safety */ | |
a0377dfe | 565 | LTTNG_ASSERT(session->kernel_session); |
917a718d JG |
566 | |
567 | /* Copy session output to the newly created Kernel session */ | |
568 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
569 | if (ret != LTTNG_OK) { | |
570 | goto error; | |
571 | } | |
572 | ||
573 | session->kernel_session->uid = session->uid; | |
574 | session->kernel_session->gid = session->gid; | |
575 | session->kernel_session->output_traces = session->output_traces; | |
576 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
a2814ea7 | 577 | session->kernel_session->is_live_session = session->live_timer != 0; |
917a718d JG |
578 | |
579 | return LTTNG_OK; | |
580 | ||
581 | error: | |
582 | trace_kernel_destroy_session(session->kernel_session); | |
cd9adb8b | 583 | session->kernel_session = nullptr; |
5d0a7bcb | 584 | error_create: |
917a718d JG |
585 | return ret; |
586 | } | |
587 | ||
588 | /* | |
589 | * Count number of session permitted by uid/gid. | |
590 | */ | |
28ab034a | 591 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid __attribute__((unused))) |
917a718d JG |
592 | { |
593 | unsigned int i = 0; | |
594 | struct ltt_session *session; | |
595 | const struct ltt_session_list *session_list = session_get_list(); | |
596 | ||
d7b377ed | 597 | DBG("Counting number of available session for UID %d", uid); |
28ab034a | 598 | cds_list_for_each_entry (session, &session_list->head, list) { |
917a718d JG |
599 | if (!session_get(session)) { |
600 | continue; | |
601 | } | |
602 | session_lock(session); | |
603 | /* Only count the sessions the user can control. */ | |
28ab034a | 604 | if (session_access_ok(session, uid) && !session->destroyed) { |
917a718d JG |
605 | i++; |
606 | } | |
607 | session_unlock(session); | |
608 | session_put(session); | |
609 | } | |
610 | return i; | |
611 | } | |
612 | ||
746e08d7 | 613 | static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx, |
28ab034a JG |
614 | int sock, |
615 | int *sock_error, | |
616 | struct lttng_trigger **_trigger) | |
746e08d7 JG |
617 | { |
618 | int ret; | |
619 | size_t trigger_len; | |
620 | ssize_t sock_recv_len; | |
621 | enum lttng_error_code ret_code; | |
622 | struct lttng_payload trigger_payload; | |
cd9adb8b | 623 | struct lttng_trigger *trigger = nullptr; |
746e08d7 JG |
624 | |
625 | lttng_payload_init(&trigger_payload); | |
626 | trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length; | |
28ab034a | 627 | ret = lttng_dynamic_buffer_set_size(&trigger_payload.buffer, trigger_len); |
746e08d7 JG |
628 | if (ret) { |
629 | ret_code = LTTNG_ERR_NOMEM; | |
630 | goto end; | |
631 | } | |
632 | ||
28ab034a | 633 | sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_payload.buffer.data, trigger_len); |
746e08d7 JG |
634 | if (sock_recv_len < 0 || sock_recv_len != trigger_len) { |
635 | ERR("Failed to receive trigger in command payload"); | |
636 | *sock_error = 1; | |
637 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
638 | goto end; | |
639 | } | |
640 | ||
641 | /* Receive fds, if any. */ | |
642 | if (cmd_ctx->lsm.fd_count > 0) { | |
643 | sock_recv_len = lttcomm_recv_payload_fds_unix_sock( | |
28ab034a JG |
644 | sock, cmd_ctx->lsm.fd_count, &trigger_payload); |
645 | if (sock_recv_len > 0 && sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
746e08d7 | 646 | ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d", |
28ab034a JG |
647 | cmd_ctx->lsm.fd_count, |
648 | (int) ret); | |
746e08d7 JG |
649 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; |
650 | *sock_error = 1; | |
651 | goto end; | |
652 | } else if (sock_recv_len <= 0) { | |
653 | ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d", | |
28ab034a JG |
654 | cmd_ctx->lsm.fd_count, |
655 | (int) ret); | |
746e08d7 JG |
656 | ret_code = LTTNG_ERR_FATAL; |
657 | *sock_error = 1; | |
658 | goto end; | |
659 | } | |
660 | } | |
661 | ||
662 | /* Deserialize trigger. */ | |
663 | { | |
664 | struct lttng_payload_view view = | |
28ab034a | 665 | lttng_payload_view_from_payload(&trigger_payload, 0, -1); |
746e08d7 | 666 | |
28ab034a | 667 | if (lttng_trigger_create_from_payload(&view, &trigger) != trigger_len) { |
746e08d7 JG |
668 | ERR("Invalid trigger received as part of command payload"); |
669 | ret_code = LTTNG_ERR_INVALID_TRIGGER; | |
b5ef1685 | 670 | lttng_trigger_put(trigger); |
746e08d7 JG |
671 | goto end; |
672 | } | |
673 | } | |
674 | ||
675 | *_trigger = trigger; | |
676 | ret_code = LTTNG_OK; | |
677 | ||
678 | end: | |
bae46a81 | 679 | lttng_payload_reset(&trigger_payload); |
746e08d7 JG |
680 | return ret_code; |
681 | } | |
682 | ||
588c4b0d | 683 | static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx, |
28ab034a JG |
684 | int sock, |
685 | int *sock_error, | |
686 | struct lttng_error_query **_query) | |
588c4b0d JG |
687 | { |
688 | int ret; | |
689 | size_t query_len; | |
690 | ssize_t sock_recv_len; | |
691 | enum lttng_error_code ret_code; | |
692 | struct lttng_payload query_payload; | |
cd9adb8b | 693 | struct lttng_error_query *query = nullptr; |
588c4b0d JG |
694 | |
695 | lttng_payload_init(&query_payload); | |
696 | query_len = (size_t) cmd_ctx->lsm.u.error_query.length; | |
697 | ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len); | |
698 | if (ret) { | |
699 | ret_code = LTTNG_ERR_NOMEM; | |
700 | goto end; | |
701 | } | |
702 | ||
28ab034a | 703 | sock_recv_len = lttcomm_recv_unix_sock(sock, query_payload.buffer.data, query_len); |
588c4b0d JG |
704 | if (sock_recv_len < 0 || sock_recv_len != query_len) { |
705 | ERR("Failed to receive error query in command payload"); | |
706 | *sock_error = 1; | |
707 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
708 | goto end; | |
709 | } | |
710 | ||
711 | /* Receive fds, if any. */ | |
712 | if (cmd_ctx->lsm.fd_count > 0) { | |
713 | sock_recv_len = lttcomm_recv_payload_fds_unix_sock( | |
28ab034a JG |
714 | sock, cmd_ctx->lsm.fd_count, &query_payload); |
715 | if (sock_recv_len > 0 && sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
588c4b0d | 716 | ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d", |
28ab034a JG |
717 | cmd_ctx->lsm.fd_count, |
718 | (int) ret); | |
588c4b0d JG |
719 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; |
720 | *sock_error = 1; | |
721 | goto end; | |
722 | } else if (sock_recv_len <= 0) { | |
723 | ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d", | |
28ab034a JG |
724 | cmd_ctx->lsm.fd_count, |
725 | (int) ret); | |
588c4b0d JG |
726 | ret_code = LTTNG_ERR_FATAL; |
727 | *sock_error = 1; | |
728 | goto end; | |
729 | } | |
730 | } | |
731 | ||
732 | /* Deserialize error query. */ | |
733 | { | |
734 | struct lttng_payload_view view = | |
28ab034a | 735 | lttng_payload_view_from_payload(&query_payload, 0, -1); |
588c4b0d | 736 | |
28ab034a | 737 | if (lttng_error_query_create_from_payload(&view, &query) != query_len) { |
588c4b0d JG |
738 | ERR("Invalid error query received as part of command payload"); |
739 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
740 | goto end; | |
741 | } | |
742 | } | |
743 | ||
744 | *_query = query; | |
745 | ret_code = LTTNG_OK; | |
746 | ||
747 | end: | |
748 | lttng_payload_reset(&query_payload); | |
749 | return ret_code; | |
750 | } | |
751 | ||
8ddd72ef | 752 | static enum lttng_error_code receive_lttng_event(struct command_ctx *cmd_ctx, |
28ab034a JG |
753 | int sock, |
754 | int *sock_error, | |
755 | struct lttng_event **out_event, | |
756 | char **out_filter_expression, | |
757 | struct lttng_bytecode **out_bytecode, | |
758 | struct lttng_event_exclusion **out_exclusion) | |
8ddd72ef JR |
759 | { |
760 | int ret; | |
761 | size_t event_len; | |
762 | ssize_t sock_recv_len; | |
763 | enum lttng_error_code ret_code; | |
764 | struct lttng_payload event_payload; | |
cd9adb8b JG |
765 | struct lttng_event *local_event = nullptr; |
766 | char *local_filter_expression = nullptr; | |
767 | struct lttng_bytecode *local_bytecode = nullptr; | |
768 | struct lttng_event_exclusion *local_exclusion = nullptr; | |
8ddd72ef JR |
769 | |
770 | lttng_payload_init(&event_payload); | |
37a5ef39 | 771 | if (cmd_ctx->lsm.cmd_type == LTTCOMM_SESSIOND_COMMAND_ENABLE_EVENT) { |
8ddd72ef | 772 | event_len = (size_t) cmd_ctx->lsm.u.enable.length; |
37a5ef39 | 773 | } else if (cmd_ctx->lsm.cmd_type == LTTCOMM_SESSIOND_COMMAND_DISABLE_EVENT) { |
8ddd72ef JR |
774 | event_len = (size_t) cmd_ctx->lsm.u.disable.length; |
775 | } else { | |
776 | abort(); | |
777 | } | |
778 | ||
779 | ret = lttng_dynamic_buffer_set_size(&event_payload.buffer, event_len); | |
780 | if (ret) { | |
781 | ret_code = LTTNG_ERR_NOMEM; | |
782 | goto end; | |
783 | } | |
784 | ||
28ab034a | 785 | sock_recv_len = lttcomm_recv_unix_sock(sock, event_payload.buffer.data, event_len); |
8ddd72ef JR |
786 | if (sock_recv_len < 0 || sock_recv_len != event_len) { |
787 | ERR("Failed to receive event in command payload"); | |
788 | *sock_error = 1; | |
789 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
790 | goto end; | |
791 | } | |
792 | ||
793 | /* Receive fds, if any. */ | |
794 | if (cmd_ctx->lsm.fd_count > 0) { | |
795 | sock_recv_len = lttcomm_recv_payload_fds_unix_sock( | |
28ab034a JG |
796 | sock, cmd_ctx->lsm.fd_count, &event_payload); |
797 | if (sock_recv_len > 0 && sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) { | |
8ddd72ef | 798 | ERR("Failed to receive all file descriptors for event in command payload: expected fd count = %u, ret = %d", |
28ab034a JG |
799 | cmd_ctx->lsm.fd_count, |
800 | (int) ret); | |
8ddd72ef JR |
801 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; |
802 | *sock_error = 1; | |
803 | goto end; | |
804 | } else if (sock_recv_len <= 0) { | |
805 | ERR("Failed to receive file descriptors for event in command payload: expected fd count = %u, ret = %d", | |
28ab034a JG |
806 | cmd_ctx->lsm.fd_count, |
807 | (int) ret); | |
8ddd72ef JR |
808 | ret_code = LTTNG_ERR_FATAL; |
809 | *sock_error = 1; | |
810 | goto end; | |
811 | } | |
812 | } | |
813 | ||
814 | /* Deserialize event. */ | |
815 | { | |
9610c0c5 | 816 | ssize_t len; |
8ddd72ef | 817 | struct lttng_payload_view event_view = |
28ab034a | 818 | lttng_payload_view_from_payload(&event_payload, 0, -1); |
8ddd72ef | 819 | |
28ab034a JG |
820 | len = lttng_event_create_from_payload(&event_view, |
821 | &local_event, | |
822 | &local_exclusion, | |
823 | &local_filter_expression, | |
824 | &local_bytecode); | |
9610c0c5 JR |
825 | |
826 | if (len < 0) { | |
827 | ERR("Failed to create an event from the received buffer"); | |
828 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
829 | goto end; | |
830 | } | |
831 | ||
832 | if (len != event_len) { | |
28ab034a JG |
833 | ERR("Userspace probe location from the received buffer is not the advertised length: header length = %zu" PRIu32 |
834 | ", payload length = %zd", | |
835 | event_len, | |
836 | len); | |
8ddd72ef JR |
837 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; |
838 | goto end; | |
839 | } | |
840 | } | |
841 | ||
9610c0c5 JR |
842 | *out_event = local_event; |
843 | *out_exclusion = local_exclusion; | |
844 | *out_filter_expression = local_filter_expression; | |
845 | *out_bytecode = local_bytecode; | |
cd9adb8b JG |
846 | local_event = nullptr; |
847 | local_exclusion = nullptr; | |
848 | local_filter_expression = nullptr; | |
849 | local_bytecode = nullptr; | |
9610c0c5 | 850 | |
8ddd72ef JR |
851 | ret_code = LTTNG_OK; |
852 | ||
853 | end: | |
854 | lttng_payload_reset(&event_payload); | |
9610c0c5 JR |
855 | lttng_event_destroy(local_event); |
856 | free(local_filter_expression); | |
857 | free(local_bytecode); | |
858 | free(local_exclusion); | |
8ddd72ef JR |
859 | return ret_code; |
860 | } | |
861 | ||
28ab034a JG |
862 | static enum lttng_error_code |
863 | receive_lttng_event_context(const struct command_ctx *cmd_ctx, | |
864 | int sock, | |
865 | int *sock_error, | |
866 | struct lttng_event_context **out_event_context) | |
26e1c61f JR |
867 | { |
868 | int ret; | |
28ab034a | 869 | const size_t event_context_len = (size_t) cmd_ctx->lsm.u.context.length; |
26e1c61f JR |
870 | ssize_t sock_recv_len; |
871 | enum lttng_error_code ret_code; | |
872 | struct lttng_payload event_context_payload; | |
cd9adb8b | 873 | struct lttng_event_context *context = nullptr; |
26e1c61f JR |
874 | |
875 | lttng_payload_init(&event_context_payload); | |
876 | ||
28ab034a | 877 | ret = lttng_dynamic_buffer_set_size(&event_context_payload.buffer, event_context_len); |
26e1c61f JR |
878 | if (ret) { |
879 | ret_code = LTTNG_ERR_NOMEM; | |
880 | goto end; | |
881 | } | |
882 | ||
28ab034a JG |
883 | sock_recv_len = |
884 | lttcomm_recv_unix_sock(sock, event_context_payload.buffer.data, event_context_len); | |
26e1c61f JR |
885 | if (sock_recv_len < 0 || sock_recv_len != event_context_len) { |
886 | ERR("Failed to receive event context in command payload"); | |
887 | *sock_error = 1; | |
888 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
889 | goto end; | |
890 | } | |
891 | ||
892 | /* Deserialize event. */ | |
893 | { | |
129d59f5 | 894 | ssize_t len; |
26e1c61f | 895 | struct lttng_payload_view event_context_view = |
28ab034a | 896 | lttng_payload_view_from_payload(&event_context_payload, 0, -1); |
26e1c61f | 897 | |
28ab034a | 898 | len = lttng_event_context_create_from_payload(&event_context_view, &context); |
129d59f5 JR |
899 | |
900 | if (len < 0) { | |
901 | ERR("Failed to create a event context from the received buffer"); | |
902 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
903 | goto end; | |
904 | } | |
905 | ||
906 | if (len != event_context_len) { | |
28ab034a JG |
907 | ERR("Event context from the received buffer is not the advertised length: expected length = %zu, payload length = %zd", |
908 | event_context_len, | |
909 | len); | |
26e1c61f JR |
910 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; |
911 | goto end; | |
912 | } | |
913 | } | |
914 | ||
129d59f5 | 915 | *out_event_context = context; |
cd9adb8b | 916 | context = nullptr; |
26e1c61f JR |
917 | ret_code = LTTNG_OK; |
918 | ||
919 | end: | |
129d59f5 | 920 | lttng_event_context_destroy(context); |
26e1c61f JR |
921 | lttng_payload_reset(&event_context_payload); |
922 | return ret_code; | |
923 | } | |
924 | ||
917a718d JG |
925 | /* |
926 | * Version of setup_lttng_msg() without command header. | |
927 | */ | |
28ab034a JG |
928 | static int |
929 | setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, void *payload_buf, size_t payload_len) | |
917a718d | 930 | { |
cd9adb8b | 931 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, nullptr, 0); |
917a718d JG |
932 | } |
933 | ||
917a718d JG |
934 | /* |
935 | * Check if the current kernel tracer supports the session rotation feature. | |
936 | * Return 1 if it does, 0 otherwise. | |
937 | */ | |
cd9adb8b | 938 | static int check_rotate_compatible() |
917a718d JG |
939 | { |
940 | int ret = 1; | |
941 | ||
28ab034a | 942 | if (the_kernel_tracer_version.major != 2 || the_kernel_tracer_version.minor < 11) { |
917a718d JG |
943 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
944 | ret = 0; | |
945 | } | |
946 | ||
947 | return ret; | |
948 | } | |
949 | ||
950 | /* | |
951 | * Send data on a unix socket using the liblttsessiondcomm API. | |
952 | * | |
953 | * Return lttcomm error code. | |
954 | */ | |
3a91de3a | 955 | static int send_unix_sock(int sock, struct lttng_payload_view *view) |
917a718d | 956 | { |
3a91de3a | 957 | int ret; |
fe489250 | 958 | const int fd_count = lttng_payload_view_get_fd_handle_count(view); |
3a91de3a | 959 | |
917a718d | 960 | /* Check valid length */ |
3a91de3a JG |
961 | if (view->buffer.size == 0) { |
962 | ret = -1; | |
963 | goto end; | |
964 | } | |
965 | ||
28ab034a | 966 | ret = lttcomm_send_unix_sock(sock, view->buffer.data, view->buffer.size); |
3a91de3a JG |
967 | if (ret < 0) { |
968 | goto end; | |
917a718d JG |
969 | } |
970 | ||
fe489250 | 971 | if (fd_count > 0) { |
700741dc JG |
972 | ret = lttcomm_send_payload_view_fds_unix_sock(sock, view); |
973 | if (ret < 0) { | |
974 | goto end; | |
fe489250 | 975 | } |
3a91de3a JG |
976 | } |
977 | ||
978 | end: | |
979 | return ret; | |
917a718d JG |
980 | } |
981 | ||
982 | /* | |
983 | * Process the command requested by the lttng client within the command | |
984 | * context structure. This function make sure that the return structure (llm) | |
985 | * is set and ready for transmission before returning. | |
986 | * | |
987 | * Return any error encountered or 0 for success. | |
988 | * | |
989 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
990 | * A command may assume the ownership of the socket, in which case its value |
991 | * should be set to -1. | |
917a718d | 992 | */ |
28ab034a | 993 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, int *sock_error) |
917a718d JG |
994 | { |
995 | int ret = LTTNG_OK; | |
9124c630 JR |
996 | bool need_tracing_session = true; |
997 | bool need_domain; | |
998 | bool need_consumerd; | |
917a718d | 999 | |
6c1db447 JG |
1000 | if (!lttcomm_sessiond_command_is_valid((lttcomm_sessiond_command) cmd_ctx->lsm.cmd_type)) { |
1001 | ERR("Unknown client command received: command id = %" PRIu32, | |
28ab034a | 1002 | cmd_ctx->lsm.cmd_type); |
6c1db447 JG |
1003 | ret = LTTNG_ERR_UND; |
1004 | goto error; | |
1005 | } | |
1006 | ||
19f912db | 1007 | DBG("Processing client command '%s\' (%d)", |
28ab034a JG |
1008 | lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx->lsm.cmd_type), |
1009 | cmd_ctx->lsm.cmd_type); | |
917a718d | 1010 | |
917a718d JG |
1011 | *sock_error = 0; |
1012 | ||
3a91de3a | 1013 | switch (cmd_ctx->lsm.cmd_type) { |
37a5ef39 JG |
1014 | case LTTCOMM_SESSIOND_COMMAND_CREATE_SESSION_EXT: |
1015 | case LTTCOMM_SESSIOND_COMMAND_DESTROY_SESSION: | |
1016 | case LTTCOMM_SESSIOND_COMMAND_LIST_SESSIONS: | |
1017 | case LTTCOMM_SESSIOND_COMMAND_LIST_DOMAINS: | |
1018 | case LTTCOMM_SESSIOND_COMMAND_START_TRACE: | |
1019 | case LTTCOMM_SESSIOND_COMMAND_STOP_TRACE: | |
1020 | case LTTCOMM_SESSIOND_COMMAND_DATA_PENDING: | |
1021 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_ADD_OUTPUT: | |
1022 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_DEL_OUTPUT: | |
1023 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_LIST_OUTPUT: | |
1024 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_RECORD: | |
1025 | case LTTCOMM_SESSIOND_COMMAND_SAVE_SESSION: | |
1026 | case LTTCOMM_SESSIOND_COMMAND_SET_SESSION_SHM_PATH: | |
1027 | case LTTCOMM_SESSIOND_COMMAND_REGENERATE_METADATA: | |
1028 | case LTTCOMM_SESSIOND_COMMAND_REGENERATE_STATEDUMP: | |
1029 | case LTTCOMM_SESSIOND_COMMAND_ROTATE_SESSION: | |
1030 | case LTTCOMM_SESSIOND_COMMAND_ROTATION_GET_INFO: | |
1031 | case LTTCOMM_SESSIOND_COMMAND_ROTATION_SET_SCHEDULE: | |
1032 | case LTTCOMM_SESSIOND_COMMAND_SESSION_LIST_ROTATION_SCHEDULES: | |
1033 | case LTTCOMM_SESSIOND_COMMAND_CLEAR_SESSION: | |
1034 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRIGGERS: | |
1035 | case LTTCOMM_SESSIOND_COMMAND_EXECUTE_ERROR_QUERY: | |
49cddecd | 1036 | case LTTCOMM_SESSIOND_COMMAND_KERNEL_TRACER_STATUS: |
9124c630 JR |
1037 | need_domain = false; |
1038 | break; | |
1039 | default: | |
1040 | need_domain = true; | |
1041 | } | |
1042 | ||
1043 | /* Needs a functioning consumerd? */ | |
1044 | switch (cmd_ctx->lsm.cmd_type) { | |
37a5ef39 JG |
1045 | case LTTCOMM_SESSIOND_COMMAND_REGISTER_TRIGGER: |
1046 | case LTTCOMM_SESSIOND_COMMAND_UNREGISTER_TRIGGER: | |
1047 | case LTTCOMM_SESSIOND_COMMAND_EXECUTE_ERROR_QUERY: | |
9124c630 | 1048 | need_consumerd = false; |
917a718d JG |
1049 | break; |
1050 | default: | |
9124c630 JR |
1051 | need_consumerd = true; |
1052 | break; | |
917a718d JG |
1053 | } |
1054 | ||
412d7227 | 1055 | if (the_config.no_kernel && need_domain && |
28ab034a | 1056 | cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) { |
917a718d JG |
1057 | if (!is_root) { |
1058 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
1059 | } else { | |
1060 | ret = LTTNG_ERR_KERN_NA; | |
1061 | } | |
1062 | goto error; | |
1063 | } | |
1064 | ||
1065 | /* Deny register consumer if we already have a spawned consumer. */ | |
37a5ef39 | 1066 | if (cmd_ctx->lsm.cmd_type == LTTCOMM_SESSIOND_COMMAND_REGISTER_CONSUMER) { |
412d7227 SM |
1067 | pthread_mutex_lock(&the_kconsumer_data.pid_mutex); |
1068 | if (the_kconsumer_data.pid > 0) { | |
917a718d | 1069 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
412d7227 | 1070 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
917a718d JG |
1071 | goto error; |
1072 | } | |
412d7227 | 1073 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
917a718d JG |
1074 | } |
1075 | ||
1076 | /* | |
1077 | * Check for command that don't needs to allocate a returned payload. We do | |
1078 | * this here so we don't have to make the call for no payload at each | |
1079 | * command. | |
1080 | */ | |
28ab034a | 1081 | switch (cmd_ctx->lsm.cmd_type) { |
37a5ef39 JG |
1082 | case LTTCOMM_SESSIOND_COMMAND_LIST_SESSIONS: |
1083 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRACEPOINTS: | |
1084 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRACEPOINT_FIELDS: | |
1085 | case LTTCOMM_SESSIOND_COMMAND_LIST_DOMAINS: | |
1086 | case LTTCOMM_SESSIOND_COMMAND_LIST_CHANNELS: | |
1087 | case LTTCOMM_SESSIOND_COMMAND_LIST_EVENTS: | |
1088 | case LTTCOMM_SESSIOND_COMMAND_LIST_SYSCALLS: | |
1089 | case LTTCOMM_SESSIOND_COMMAND_SESSION_LIST_ROTATION_SCHEDULES: | |
1090 | case LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_GET_POLICY: | |
1091 | case LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: | |
1092 | case LTTCOMM_SESSIOND_COMMAND_DATA_PENDING: | |
1093 | case LTTCOMM_SESSIOND_COMMAND_ROTATE_SESSION: | |
1094 | case LTTCOMM_SESSIOND_COMMAND_ROTATION_GET_INFO: | |
1095 | case LTTCOMM_SESSIOND_COMMAND_REGISTER_TRIGGER: | |
1096 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRIGGERS: | |
1097 | case LTTCOMM_SESSIOND_COMMAND_EXECUTE_ERROR_QUERY: | |
917a718d JG |
1098 | break; |
1099 | default: | |
1100 | /* Setup lttng message with no payload */ | |
cd9adb8b | 1101 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, nullptr, 0); |
917a718d JG |
1102 | if (ret < 0) { |
1103 | /* This label does not try to unlock the session */ | |
1104 | goto init_setup_error; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | /* Commands that DO NOT need a session. */ | |
3a91de3a | 1109 | switch (cmd_ctx->lsm.cmd_type) { |
37a5ef39 JG |
1110 | case LTTCOMM_SESSIOND_COMMAND_CREATE_SESSION_EXT: |
1111 | case LTTCOMM_SESSIOND_COMMAND_LIST_SESSIONS: | |
1112 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRACEPOINTS: | |
1113 | case LTTCOMM_SESSIOND_COMMAND_LIST_SYSCALLS: | |
1114 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRACEPOINT_FIELDS: | |
1115 | case LTTCOMM_SESSIOND_COMMAND_SAVE_SESSION: | |
1116 | case LTTCOMM_SESSIOND_COMMAND_REGISTER_TRIGGER: | |
1117 | case LTTCOMM_SESSIOND_COMMAND_UNREGISTER_TRIGGER: | |
1118 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRIGGERS: | |
1119 | case LTTCOMM_SESSIOND_COMMAND_EXECUTE_ERROR_QUERY: | |
49cddecd | 1120 | case LTTCOMM_SESSIOND_COMMAND_KERNEL_TRACER_STATUS: |
9124c630 | 1121 | need_tracing_session = false; |
917a718d JG |
1122 | break; |
1123 | default: | |
3a91de3a | 1124 | DBG("Getting session %s by name", cmd_ctx->lsm.session.name); |
917a718d JG |
1125 | /* |
1126 | * We keep the session list lock across _all_ commands | |
1127 | * for now, because the per-session lock does not | |
1128 | * handle teardown properly. | |
1129 | */ | |
1130 | session_lock_list(); | |
3a91de3a | 1131 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name); |
cd9adb8b | 1132 | if (cmd_ctx->session == nullptr) { |
917a718d JG |
1133 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
1134 | goto error; | |
1135 | } else { | |
1136 | /* Acquire lock for the session */ | |
1137 | session_lock(cmd_ctx->session); | |
1138 | } | |
1139 | break; | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Commands that need a valid session but should NOT create one if none | |
1144 | * exists. Instead of creating one and destroying it when the command is | |
1145 | * handled, process that right before so we save some round trip in useless | |
1146 | * code path. | |
1147 | */ | |
3a91de3a | 1148 | switch (cmd_ctx->lsm.cmd_type) { |
37a5ef39 JG |
1149 | case LTTCOMM_SESSIOND_COMMAND_DISABLE_CHANNEL: |
1150 | case LTTCOMM_SESSIOND_COMMAND_DISABLE_EVENT: | |
3a91de3a | 1151 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1152 | case LTTNG_DOMAIN_KERNEL: |
1153 | if (!cmd_ctx->session->kernel_session) { | |
1154 | ret = LTTNG_ERR_NO_CHANNEL; | |
1155 | goto error; | |
1156 | } | |
1157 | break; | |
1158 | case LTTNG_DOMAIN_JUL: | |
1159 | case LTTNG_DOMAIN_LOG4J: | |
1160 | case LTTNG_DOMAIN_PYTHON: | |
1161 | case LTTNG_DOMAIN_UST: | |
1162 | if (!cmd_ctx->session->ust_session) { | |
1163 | ret = LTTNG_ERR_NO_CHANNEL; | |
1164 | goto error; | |
1165 | } | |
1166 | break; | |
1167 | default: | |
1168 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1169 | goto error; | |
1170 | } | |
1171 | default: | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | if (!need_domain) { | |
1176 | goto skip_domain; | |
1177 | } | |
1178 | ||
1179 | /* | |
1180 | * Check domain type for specific "pre-action". | |
1181 | */ | |
3a91de3a | 1182 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1183 | case LTTNG_DOMAIN_KERNEL: |
1184 | if (!is_root) { | |
1185 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
1186 | goto error; | |
1187 | } | |
1188 | ||
7d268848 MD |
1189 | /* Kernel tracer check */ |
1190 | if (!kernel_tracer_is_initialized()) { | |
1191 | /* Basically, load kernel tracer modules */ | |
1192 | ret = init_kernel_tracer(); | |
1193 | if (ret != 0) { | |
1194 | goto error; | |
1195 | } | |
1196 | } | |
1197 | ||
917a718d | 1198 | /* Consumer is in an ERROR state. Report back to client */ |
28ab034a | 1199 | if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) == CONSUMER_ERROR) { |
917a718d JG |
1200 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
1201 | goto error; | |
1202 | } | |
1203 | ||
1204 | /* Need a session for kernel command */ | |
1205 | if (need_tracing_session) { | |
cd9adb8b | 1206 | if (cmd_ctx->session->kernel_session == nullptr) { |
917a718d | 1207 | ret = create_kernel_session(cmd_ctx->session); |
51630bd8 | 1208 | if (ret != LTTNG_OK) { |
917a718d JG |
1209 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
1210 | goto error; | |
1211 | } | |
1212 | } | |
1213 | ||
1214 | /* Start the kernel consumer daemon */ | |
412d7227 SM |
1215 | pthread_mutex_lock(&the_kconsumer_data.pid_mutex); |
1216 | if (the_kconsumer_data.pid == 0 && | |
28ab034a | 1217 | cmd_ctx->lsm.cmd_type != LTTCOMM_SESSIOND_COMMAND_REGISTER_CONSUMER) { |
412d7227 SM |
1218 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
1219 | ret = start_consumerd(&the_kconsumer_data); | |
917a718d JG |
1220 | if (ret < 0) { |
1221 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
1222 | goto error; | |
1223 | } | |
412d7227 | 1224 | uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED); |
917a718d | 1225 | } else { |
412d7227 | 1226 | pthread_mutex_unlock(&the_kconsumer_data.pid_mutex); |
917a718d JG |
1227 | } |
1228 | ||
1229 | /* | |
1230 | * The consumer was just spawned so we need to add the socket to | |
1231 | * the consumer output of the session if exist. | |
1232 | */ | |
412d7227 | 1233 | ret = consumer_create_socket(&the_kconsumer_data, |
28ab034a | 1234 | cmd_ctx->session->kernel_session->consumer); |
917a718d JG |
1235 | if (ret < 0) { |
1236 | goto error; | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | break; | |
1241 | case LTTNG_DOMAIN_JUL: | |
1242 | case LTTNG_DOMAIN_LOG4J: | |
1243 | case LTTNG_DOMAIN_PYTHON: | |
44760c20 JR |
1244 | if (!agent_tracing_is_enabled()) { |
1245 | ret = LTTNG_ERR_AGENT_TRACING_DISABLED; | |
1246 | goto error; | |
1247 | } | |
1248 | /* Fallthrough */ | |
917a718d JG |
1249 | case LTTNG_DOMAIN_UST: |
1250 | { | |
1251 | if (!ust_app_supported()) { | |
1252 | ret = LTTNG_ERR_NO_UST; | |
1253 | goto error; | |
1254 | } | |
9124c630 | 1255 | |
917a718d | 1256 | /* Consumer is in an ERROR state. Report back to client */ |
28ab034a | 1257 | if (need_consumerd && uatomic_read(&the_ust_consumerd_state) == CONSUMER_ERROR) { |
917a718d JG |
1258 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
1259 | goto error; | |
1260 | } | |
1261 | ||
1262 | if (need_tracing_session) { | |
1263 | /* Create UST session if none exist. */ | |
cd9adb8b | 1264 | if (cmd_ctx->session->ust_session == nullptr) { |
7966af57 SM |
1265 | lttng_domain domain = cmd_ctx->lsm.domain; |
1266 | ret = create_ust_session(cmd_ctx->session, &domain); | |
917a718d JG |
1267 | if (ret != LTTNG_OK) { |
1268 | goto error; | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | /* Start the UST consumer daemons */ | |
1273 | /* 64-bit */ | |
412d7227 SM |
1274 | pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex); |
1275 | if (the_config.consumerd64_bin_path.value && | |
28ab034a JG |
1276 | the_ustconsumer64_data.pid == 0 && |
1277 | cmd_ctx->lsm.cmd_type != LTTCOMM_SESSIOND_COMMAND_REGISTER_CONSUMER) { | |
412d7227 SM |
1278 | pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex); |
1279 | ret = start_consumerd(&the_ustconsumer64_data); | |
917a718d JG |
1280 | if (ret < 0) { |
1281 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
412d7227 | 1282 | uatomic_set(&the_ust_consumerd64_fd, -EINVAL); |
917a718d JG |
1283 | goto error; |
1284 | } | |
1285 | ||
28ab034a JG |
1286 | uatomic_set(&the_ust_consumerd64_fd, |
1287 | the_ustconsumer64_data.cmd_sock); | |
412d7227 | 1288 | uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED); |
917a718d | 1289 | } else { |
412d7227 | 1290 | pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex); |
917a718d JG |
1291 | } |
1292 | ||
1293 | /* | |
1294 | * Setup socket for consumer 64 bit. No need for atomic access | |
1295 | * since it was set above and can ONLY be set in this thread. | |
1296 | */ | |
412d7227 | 1297 | ret = consumer_create_socket(&the_ustconsumer64_data, |
28ab034a | 1298 | cmd_ctx->session->ust_session->consumer); |
917a718d JG |
1299 | if (ret < 0) { |
1300 | goto error; | |
1301 | } | |
1302 | ||
1303 | /* 32-bit */ | |
412d7227 SM |
1304 | pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex); |
1305 | if (the_config.consumerd32_bin_path.value && | |
28ab034a JG |
1306 | the_ustconsumer32_data.pid == 0 && |
1307 | cmd_ctx->lsm.cmd_type != LTTCOMM_SESSIOND_COMMAND_REGISTER_CONSUMER) { | |
412d7227 SM |
1308 | pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex); |
1309 | ret = start_consumerd(&the_ustconsumer32_data); | |
917a718d JG |
1310 | if (ret < 0) { |
1311 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
412d7227 | 1312 | uatomic_set(&the_ust_consumerd32_fd, -EINVAL); |
917a718d JG |
1313 | goto error; |
1314 | } | |
1315 | ||
28ab034a JG |
1316 | uatomic_set(&the_ust_consumerd32_fd, |
1317 | the_ustconsumer32_data.cmd_sock); | |
412d7227 | 1318 | uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED); |
917a718d | 1319 | } else { |
412d7227 | 1320 | pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex); |
917a718d JG |
1321 | } |
1322 | ||
1323 | /* | |
1324 | * Setup socket for consumer 32 bit. No need for atomic access | |
1325 | * since it was set above and can ONLY be set in this thread. | |
1326 | */ | |
412d7227 | 1327 | ret = consumer_create_socket(&the_ustconsumer32_data, |
28ab034a | 1328 | cmd_ctx->session->ust_session->consumer); |
917a718d JG |
1329 | if (ret < 0) { |
1330 | goto error; | |
1331 | } | |
1332 | } | |
1333 | break; | |
1334 | } | |
1335 | default: | |
1336 | break; | |
1337 | } | |
1338 | skip_domain: | |
1339 | ||
1340 | /* Validate consumer daemon state when start/stop trace command */ | |
37a5ef39 | 1341 | if (cmd_ctx->lsm.cmd_type == LTTCOMM_SESSIOND_COMMAND_START_TRACE || |
28ab034a | 1342 | cmd_ctx->lsm.cmd_type == LTTCOMM_SESSIOND_COMMAND_STOP_TRACE) { |
3a91de3a | 1343 | switch (cmd_ctx->lsm.domain.type) { |
917a718d JG |
1344 | case LTTNG_DOMAIN_NONE: |
1345 | break; | |
1346 | case LTTNG_DOMAIN_JUL: | |
1347 | case LTTNG_DOMAIN_LOG4J: | |
1348 | case LTTNG_DOMAIN_PYTHON: | |
1349 | case LTTNG_DOMAIN_UST: | |
412d7227 | 1350 | if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) { |
917a718d JG |
1351 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
1352 | goto error; | |
1353 | } | |
1354 | break; | |
1355 | case LTTNG_DOMAIN_KERNEL: | |
412d7227 | 1356 | if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) { |
917a718d JG |
1357 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
1358 | goto error; | |
1359 | } | |
1360 | break; | |
1361 | default: | |
1362 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1363 | goto error; | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | /* | |
d7b377ed | 1368 | * Check that the UID matches that of the tracing session. |
917a718d JG |
1369 | * The root user can interact with all sessions. |
1370 | */ | |
1371 | if (need_tracing_session) { | |
1372 | if (!session_access_ok(cmd_ctx->session, | |
28ab034a JG |
1373 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) || |
1374 | cmd_ctx->session->destroyed) { | |
917a718d JG |
1375 | ret = LTTNG_ERR_EPERM; |
1376 | goto error; | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * Send relayd information to consumer as soon as we have a domain and a | |
1382 | * session defined. | |
1383 | */ | |
1384 | if (cmd_ctx->session && need_domain) { | |
1385 | /* | |
1386 | * Setup relayd if not done yet. If the relayd information was already | |
1387 | * sent to the consumer, this call will gracefully return. | |
1388 | */ | |
1389 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1390 | if (ret != LTTNG_OK) { | |
1391 | goto error; | |
1392 | } | |
1393 | } | |
1394 | ||
1395 | /* Process by command type */ | |
3a91de3a | 1396 | switch (cmd_ctx->lsm.cmd_type) { |
37a5ef39 | 1397 | case LTTCOMM_SESSIOND_COMMAND_ADD_CONTEXT: |
917a718d | 1398 | { |
cd9adb8b | 1399 | struct lttng_event_context *event_context = nullptr; |
26e1c61f | 1400 | const enum lttng_error_code ret_code = |
28ab034a | 1401 | receive_lttng_event_context(cmd_ctx, *sock, sock_error, &event_context); |
917a718d | 1402 | |
26e1c61f JR |
1403 | if (ret_code != LTTNG_OK) { |
1404 | ret = (int) ret_code; | |
917a718d JG |
1405 | goto error; |
1406 | } | |
26e1c61f JR |
1407 | |
1408 | ret = cmd_add_context(cmd_ctx, event_context, the_kernel_poll_pipe[1]); | |
1409 | lttng_event_context_destroy(event_context); | |
917a718d JG |
1410 | break; |
1411 | } | |
37a5ef39 | 1412 | case LTTCOMM_SESSIOND_COMMAND_DISABLE_CHANNEL: |
917a718d | 1413 | { |
28ab034a JG |
1414 | ret = cmd_disable_channel(cmd_ctx->session, |
1415 | cmd_ctx->lsm.domain.type, | |
1416 | cmd_ctx->lsm.u.disable.channel_name); | |
917a718d JG |
1417 | break; |
1418 | } | |
37a5ef39 | 1419 | case LTTCOMM_SESSIOND_COMMAND_ENABLE_CHANNEL: |
917a718d | 1420 | { |
28ab034a | 1421 | ret = cmd_enable_channel(cmd_ctx, *sock, the_kernel_poll_pipe[1]); |
917a718d JG |
1422 | break; |
1423 | } | |
37a5ef39 JG |
1424 | case LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE: |
1425 | case LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE: | |
917a718d | 1426 | { |
159b042f JG |
1427 | struct lttng_dynamic_buffer payload; |
1428 | struct lttng_buffer_view payload_view; | |
28ab034a JG |
1429 | const bool add_value = cmd_ctx->lsm.cmd_type == |
1430 | LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE; | |
159b042f | 1431 | const size_t name_len = |
28ab034a | 1432 | cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value.name_len; |
159b042f | 1433 | const enum lttng_domain_type domain_type = |
28ab034a | 1434 | (enum lttng_domain_type) cmd_ctx->lsm.domain.type; |
159b042f | 1435 | const enum lttng_process_attr process_attr = |
28ab034a JG |
1436 | (enum lttng_process_attr) cmd_ctx->lsm.u |
1437 | .process_attr_tracker_add_remove_include_value.process_attr; | |
159b042f | 1438 | const enum lttng_process_attr_value_type value_type = |
28ab034a JG |
1439 | (enum lttng_process_attr_value_type) cmd_ctx->lsm.u |
1440 | .process_attr_tracker_add_remove_include_value.value_type; | |
159b042f JG |
1441 | struct process_attr_value *value; |
1442 | enum lttng_error_code ret_code; | |
1434fd36 MJ |
1443 | long login_name_max; |
1444 | ||
1445 | login_name_max = sysconf(_SC_LOGIN_NAME_MAX); | |
1446 | if (login_name_max < 0) { | |
1447 | PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration"); | |
1448 | ret = LTTNG_ERR_INVALID; | |
1449 | goto error; | |
1450 | } | |
159b042f JG |
1451 | |
1452 | /* Receive remaining variable length payload if applicable. */ | |
1434fd36 | 1453 | if (name_len > login_name_max) { |
159b042f JG |
1454 | /* |
1455 | * POSIX mandates user and group names that are at least | |
1456 | * 8 characters long. Note that although shadow-utils | |
1457 | * (useradd, groupaadd, etc.) use 32 chars as their | |
1458 | * limit (from bits/utmp.h, UT_NAMESIZE), | |
1459 | * LOGIN_NAME_MAX is defined to 256. | |
1460 | */ | |
1434fd36 | 1461 | ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld", |
28ab034a JG |
1462 | add_value ? "addition" : "removal", |
1463 | name_len, | |
1464 | login_name_max); | |
159b042f | 1465 | ret = LTTNG_ERR_INVALID; |
2d97a006 JR |
1466 | goto error; |
1467 | } | |
1468 | ||
159b042f JG |
1469 | lttng_dynamic_buffer_init(&payload); |
1470 | if (name_len != 0) { | |
1471 | /* | |
1472 | * Receive variable payload for user/group name | |
1473 | * arguments. | |
1474 | */ | |
1475 | ret = lttng_dynamic_buffer_set_size(&payload, name_len); | |
1476 | if (ret) { | |
1477 | ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument", | |
28ab034a | 1478 | add_value ? "add" : "remove"); |
55c9e7ca | 1479 | ret = LTTNG_ERR_NOMEM; |
159b042f | 1480 | goto error_add_remove_tracker_value; |
55c9e7ca | 1481 | } |
159b042f | 1482 | |
28ab034a | 1483 | ret = lttcomm_recv_unix_sock(*sock, payload.data, name_len); |
55c9e7ca | 1484 | if (ret <= 0) { |
159b042f | 1485 | ERR("Failed to receive payload of %s process attribute tracker value argument", |
28ab034a | 1486 | add_value ? "add" : "remove"); |
55c9e7ca | 1487 | *sock_error = 1; |
159b042f JG |
1488 | ret = LTTNG_ERR_INVALID_PROTOCOL; |
1489 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1490 | } |
159b042f | 1491 | } |
2d97a006 | 1492 | |
28ab034a | 1493 | payload_view = lttng_buffer_view_from_dynamic_buffer(&payload, 0, name_len); |
3e6e0df2 JG |
1494 | if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) { |
1495 | ret = LTTNG_ERR_INVALID_PROTOCOL; | |
1496 | goto error_add_remove_tracker_value; | |
1497 | } | |
1498 | ||
159b042f JG |
1499 | /* |
1500 | * Validate the value type and domains are legal for the process | |
1501 | * attribute tracker that is specified and convert the value to | |
1502 | * add/remove to the internal sessiond representation. | |
1503 | */ | |
28ab034a JG |
1504 | ret_code = process_attr_value_from_comm( |
1505 | domain_type, | |
1506 | process_attr, | |
1507 | value_type, | |
1508 | &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value.integral_value, | |
1509 | &payload_view, | |
1510 | &value); | |
159b042f JG |
1511 | if (ret_code != LTTNG_OK) { |
1512 | ret = ret_code; | |
1513 | goto error_add_remove_tracker_value; | |
55c9e7ca | 1514 | } |
159b042f JG |
1515 | |
1516 | if (add_value) { | |
1517 | ret = cmd_process_attr_tracker_inclusion_set_add_value( | |
28ab034a | 1518 | cmd_ctx->session, domain_type, process_attr, value); |
159b042f JG |
1519 | } else { |
1520 | ret = cmd_process_attr_tracker_inclusion_set_remove_value( | |
28ab034a | 1521 | cmd_ctx->session, domain_type, process_attr, value); |
159b042f JG |
1522 | } |
1523 | process_attr_value_destroy(value); | |
1524 | error_add_remove_tracker_value: | |
1525 | lttng_dynamic_buffer_reset(&payload); | |
1526 | break; | |
1527 | } | |
37a5ef39 | 1528 | case LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_GET_POLICY: |
159b042f JG |
1529 | { |
1530 | enum lttng_tracking_policy tracking_policy; | |
1531 | const enum lttng_domain_type domain_type = | |
28ab034a | 1532 | (enum lttng_domain_type) cmd_ctx->lsm.domain.type; |
159b042f | 1533 | const enum lttng_process_attr process_attr = |
28ab034a JG |
1534 | (enum lttng_process_attr) cmd_ctx->lsm.u |
1535 | .process_attr_tracker_get_tracking_policy.process_attr; | |
159b042f JG |
1536 | |
1537 | ret = cmd_process_attr_tracker_get_tracking_policy( | |
28ab034a | 1538 | cmd_ctx->session, domain_type, process_attr, &tracking_policy); |
159b042f | 1539 | if (ret != LTTNG_OK) { |
55c9e7ca JR |
1540 | goto error; |
1541 | } | |
2d97a006 | 1542 | |
7966af57 | 1543 | uint32_t tracking_policy_u32 = tracking_policy; |
28ab034a JG |
1544 | ret = setup_lttng_msg_no_cmd_header( |
1545 | cmd_ctx, &tracking_policy_u32, sizeof(uint32_t)); | |
159b042f JG |
1546 | if (ret < 0) { |
1547 | ret = LTTNG_ERR_NOMEM; | |
2d97a006 JR |
1548 | goto error; |
1549 | } | |
159b042f | 1550 | ret = LTTNG_OK; |
917a718d JG |
1551 | break; |
1552 | } | |
37a5ef39 | 1553 | case LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_SET_POLICY: |
917a718d | 1554 | { |
159b042f | 1555 | const enum lttng_tracking_policy tracking_policy = |
28ab034a JG |
1556 | (enum lttng_tracking_policy) cmd_ctx->lsm.u |
1557 | .process_attr_tracker_set_tracking_policy.tracking_policy; | |
159b042f | 1558 | const enum lttng_domain_type domain_type = |
28ab034a | 1559 | (enum lttng_domain_type) cmd_ctx->lsm.domain.type; |
159b042f | 1560 | const enum lttng_process_attr process_attr = |
28ab034a JG |
1561 | (enum lttng_process_attr) cmd_ctx->lsm.u |
1562 | .process_attr_tracker_set_tracking_policy.process_attr; | |
159b042f JG |
1563 | |
1564 | ret = cmd_process_attr_tracker_set_tracking_policy( | |
28ab034a | 1565 | cmd_ctx->session, domain_type, process_attr, tracking_policy); |
159b042f JG |
1566 | if (ret != LTTNG_OK) { |
1567 | goto error; | |
55c9e7ca | 1568 | } |
159b042f JG |
1569 | break; |
1570 | } | |
37a5ef39 | 1571 | case LTTCOMM_SESSIOND_COMMAND_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET: |
159b042f JG |
1572 | { |
1573 | struct lttng_process_attr_values *values; | |
1574 | struct lttng_dynamic_buffer reply; | |
1575 | const enum lttng_domain_type domain_type = | |
28ab034a | 1576 | (enum lttng_domain_type) cmd_ctx->lsm.domain.type; |
159b042f | 1577 | const enum lttng_process_attr process_attr = |
28ab034a JG |
1578 | (enum lttng_process_attr) |
1579 | cmd_ctx->lsm.u.process_attr_tracker_get_inclusion_set.process_attr; | |
159b042f JG |
1580 | |
1581 | ret = cmd_process_attr_tracker_get_inclusion_set( | |
28ab034a | 1582 | cmd_ctx->session, domain_type, process_attr, &values); |
159b042f | 1583 | if (ret != LTTNG_OK) { |
55c9e7ca JR |
1584 | goto error; |
1585 | } | |
2d97a006 | 1586 | |
159b042f JG |
1587 | lttng_dynamic_buffer_init(&reply); |
1588 | ret = lttng_process_attr_values_serialize(values, &reply); | |
1589 | if (ret < 0) { | |
1590 | goto error_tracker_get_inclusion_set; | |
2d97a006 JR |
1591 | } |
1592 | ||
28ab034a | 1593 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, reply.data, reply.size); |
159b042f JG |
1594 | if (ret < 0) { |
1595 | ret = LTTNG_ERR_NOMEM; | |
1596 | goto error_tracker_get_inclusion_set; | |
1597 | } | |
1598 | ret = LTTNG_OK; | |
1599 | ||
1600 | error_tracker_get_inclusion_set: | |
1601 | lttng_process_attr_values_destroy(values); | |
1602 | lttng_dynamic_buffer_reset(&reply); | |
917a718d JG |
1603 | break; |
1604 | } | |
37a5ef39 JG |
1605 | case LTTCOMM_SESSIOND_COMMAND_ENABLE_EVENT: |
1606 | case LTTCOMM_SESSIOND_COMMAND_DISABLE_EVENT: | |
917a718d | 1607 | { |
8ddd72ef JR |
1608 | struct lttng_event *event; |
1609 | char *filter_expression; | |
1610 | struct lttng_event_exclusion *exclusions; | |
1611 | struct lttng_bytecode *bytecode; | |
28ab034a JG |
1612 | const enum lttng_error_code ret_code = receive_lttng_event(cmd_ctx, |
1613 | *sock, | |
1614 | sock_error, | |
1615 | &event, | |
1616 | &filter_expression, | |
1617 | &bytecode, | |
1618 | &exclusions); | |
917a718d | 1619 | |
8ddd72ef JR |
1620 | if (ret_code != LTTNG_OK) { |
1621 | ret = (int) ret_code; | |
917a718d JG |
1622 | goto error; |
1623 | } | |
1624 | ||
8ddd72ef JR |
1625 | /* |
1626 | * Ownership of filter_expression, exclusions, and bytecode is | |
1627 | * always transferred. | |
1628 | */ | |
37a5ef39 | 1629 | ret = cmd_ctx->lsm.cmd_type == LTTCOMM_SESSIOND_COMMAND_ENABLE_EVENT ? |
28ab034a JG |
1630 | cmd_enable_event(cmd_ctx, |
1631 | event, | |
1632 | filter_expression, | |
1633 | exclusions, | |
1634 | bytecode, | |
1635 | the_kernel_poll_pipe[1]) : | |
1636 | cmd_disable_event(cmd_ctx, event, filter_expression, bytecode, exclusions); | |
8ddd72ef | 1637 | lttng_event_destroy(event); |
917a718d JG |
1638 | break; |
1639 | } | |
37a5ef39 | 1640 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRACEPOINTS: |
917a718d | 1641 | { |
8ddd72ef JR |
1642 | enum lttng_error_code ret_code; |
1643 | size_t original_payload_size; | |
1644 | size_t payload_size; | |
1645 | const size_t command_header_size = sizeof(struct lttcomm_list_command_header); | |
1646 | ||
1647 | ret = setup_empty_lttng_msg(cmd_ctx); | |
1648 | if (ret) { | |
1649 | ret = LTTNG_ERR_NOMEM; | |
1650 | goto setup_error; | |
1651 | } | |
1652 | ||
1653 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
917a718d JG |
1654 | |
1655 | session_lock_list(); | |
28ab034a | 1656 | ret_code = cmd_list_tracepoints(cmd_ctx->lsm.domain.type, &cmd_ctx->reply_payload); |
917a718d | 1657 | session_unlock_list(); |
8ddd72ef JR |
1658 | if (ret_code != LTTNG_OK) { |
1659 | ret = (int) ret_code; | |
917a718d JG |
1660 | goto error; |
1661 | } | |
1662 | ||
28ab034a JG |
1663 | payload_size = cmd_ctx->reply_payload.buffer.size - command_header_size - |
1664 | original_payload_size; | |
8ddd72ef | 1665 | update_lttng_msg(cmd_ctx, command_header_size, payload_size); |
917a718d JG |
1666 | |
1667 | ret = LTTNG_OK; | |
1668 | break; | |
1669 | } | |
37a5ef39 | 1670 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRACEPOINT_FIELDS: |
917a718d | 1671 | { |
b2d68839 JR |
1672 | enum lttng_error_code ret_code; |
1673 | size_t original_payload_size; | |
1674 | size_t payload_size; | |
1675 | const size_t command_header_size = sizeof(struct lttcomm_list_command_header); | |
1676 | ||
1677 | ret = setup_empty_lttng_msg(cmd_ctx); | |
1678 | if (ret) { | |
1679 | ret = LTTNG_ERR_NOMEM; | |
1680 | goto setup_error; | |
1681 | } | |
1682 | ||
1683 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
917a718d JG |
1684 | |
1685 | session_lock_list(); | |
28ab034a JG |
1686 | ret_code = cmd_list_tracepoint_fields(cmd_ctx->lsm.domain.type, |
1687 | &cmd_ctx->reply_payload); | |
917a718d | 1688 | session_unlock_list(); |
b2d68839 JR |
1689 | if (ret_code != LTTNG_OK) { |
1690 | ret = (int) ret_code; | |
917a718d JG |
1691 | goto error; |
1692 | } | |
1693 | ||
28ab034a JG |
1694 | payload_size = cmd_ctx->reply_payload.buffer.size - command_header_size - |
1695 | original_payload_size; | |
b2d68839 | 1696 | update_lttng_msg(cmd_ctx, command_header_size, payload_size); |
917a718d JG |
1697 | |
1698 | ret = LTTNG_OK; | |
1699 | break; | |
1700 | } | |
37a5ef39 | 1701 | case LTTCOMM_SESSIOND_COMMAND_LIST_SYSCALLS: |
917a718d | 1702 | { |
8ddd72ef JR |
1703 | enum lttng_error_code ret_code; |
1704 | size_t original_payload_size; | |
1705 | size_t payload_size; | |
1706 | const size_t command_header_size = sizeof(struct lttcomm_list_command_header); | |
917a718d | 1707 | |
8ddd72ef JR |
1708 | ret = setup_empty_lttng_msg(cmd_ctx); |
1709 | if (ret) { | |
1710 | ret = LTTNG_ERR_NOMEM; | |
1711 | goto setup_error; | |
917a718d JG |
1712 | } |
1713 | ||
8ddd72ef | 1714 | original_payload_size = cmd_ctx->reply_payload.buffer.size; |
917a718d | 1715 | |
8ddd72ef JR |
1716 | ret_code = cmd_list_syscalls(&cmd_ctx->reply_payload); |
1717 | if (ret_code != LTTNG_OK) { | |
1718 | ret = (int) ret_code; | |
1719 | goto error; | |
917a718d JG |
1720 | } |
1721 | ||
28ab034a JG |
1722 | payload_size = cmd_ctx->reply_payload.buffer.size - command_header_size - |
1723 | original_payload_size; | |
8ddd72ef JR |
1724 | update_lttng_msg(cmd_ctx, command_header_size, payload_size); |
1725 | ||
917a718d JG |
1726 | ret = LTTNG_OK; |
1727 | break; | |
1728 | } | |
37a5ef39 | 1729 | case LTTCOMM_SESSIOND_COMMAND_SET_CONSUMER_URI: |
917a718d JG |
1730 | { |
1731 | size_t nb_uri, len; | |
1732 | struct lttng_uri *uris; | |
1733 | ||
3a91de3a | 1734 | nb_uri = cmd_ctx->lsm.u.uri.size; |
917a718d JG |
1735 | len = nb_uri * sizeof(struct lttng_uri); |
1736 | ||
1737 | if (nb_uri == 0) { | |
1738 | ret = LTTNG_ERR_INVALID; | |
1739 | goto error; | |
1740 | } | |
1741 | ||
64803277 | 1742 | uris = calloc<lttng_uri>(nb_uri); |
cd9adb8b | 1743 | if (uris == nullptr) { |
917a718d JG |
1744 | ret = LTTNG_ERR_FATAL; |
1745 | goto error; | |
1746 | } | |
1747 | ||
1748 | /* Receive variable len data */ | |
1749 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1750 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1751 | if (ret <= 0) { |
1752 | DBG("No URIs received from client... continuing"); | |
1753 | *sock_error = 1; | |
1754 | ret = LTTNG_ERR_SESSION_FAIL; | |
1755 | free(uris); | |
1756 | goto error; | |
1757 | } | |
1758 | ||
1759 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1760 | free(uris); | |
1761 | if (ret != LTTNG_OK) { | |
1762 | goto error; | |
1763 | } | |
1764 | ||
917a718d JG |
1765 | break; |
1766 | } | |
37a5ef39 | 1767 | case LTTCOMM_SESSIOND_COMMAND_START_TRACE: |
917a718d JG |
1768 | { |
1769 | /* | |
1770 | * On the first start, if we have a kernel session and we have | |
1771 | * enabled time or size-based rotations, we have to make sure | |
1772 | * the kernel tracer supports it. | |
1773 | */ | |
28ab034a JG |
1774 | if (!cmd_ctx->session->has_been_started && cmd_ctx->session->kernel_session && |
1775 | (cmd_ctx->session->rotate_timer_period || cmd_ctx->session->rotate_size) && | |
1776 | !check_rotate_compatible()) { | |
917a718d JG |
1777 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
1778 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1779 | goto error; | |
1780 | } | |
1781 | ret = cmd_start_trace(cmd_ctx->session); | |
1782 | break; | |
1783 | } | |
37a5ef39 | 1784 | case LTTCOMM_SESSIOND_COMMAND_STOP_TRACE: |
917a718d JG |
1785 | { |
1786 | ret = cmd_stop_trace(cmd_ctx->session); | |
1787 | break; | |
1788 | } | |
37a5ef39 | 1789 | case LTTCOMM_SESSIOND_COMMAND_DESTROY_SESSION: |
917a718d | 1790 | { |
0038180d | 1791 | ret = cmd_destroy_session(cmd_ctx->session, sock); |
917a718d JG |
1792 | break; |
1793 | } | |
37a5ef39 | 1794 | case LTTCOMM_SESSIOND_COMMAND_LIST_DOMAINS: |
917a718d JG |
1795 | { |
1796 | ssize_t nb_dom; | |
cd9adb8b | 1797 | struct lttng_domain *domains = nullptr; |
917a718d JG |
1798 | |
1799 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1800 | if (nb_dom < 0) { | |
1801 | /* Return value is a negative lttng_error_code. */ | |
1802 | ret = -nb_dom; | |
1803 | goto error; | |
1804 | } | |
1805 | ||
28ab034a JG |
1806 | ret = setup_lttng_msg_no_cmd_header( |
1807 | cmd_ctx, domains, nb_dom * sizeof(struct lttng_domain)); | |
917a718d JG |
1808 | free(domains); |
1809 | ||
1810 | if (ret < 0) { | |
1811 | goto setup_error; | |
1812 | } | |
1813 | ||
1814 | ret = LTTNG_OK; | |
1815 | break; | |
1816 | } | |
37a5ef39 | 1817 | case LTTCOMM_SESSIOND_COMMAND_LIST_CHANNELS: |
917a718d | 1818 | { |
999af9c1 JR |
1819 | enum lttng_error_code ret_code; |
1820 | size_t original_payload_size; | |
1821 | size_t payload_size; | |
1822 | const size_t command_header_size = sizeof(struct lttcomm_list_command_header); | |
917a718d | 1823 | |
999af9c1 JR |
1824 | ret = setup_empty_lttng_msg(cmd_ctx); |
1825 | if (ret) { | |
1826 | ret = LTTNG_ERR_NOMEM; | |
1827 | goto setup_error; | |
917a718d JG |
1828 | } |
1829 | ||
999af9c1 | 1830 | original_payload_size = cmd_ctx->reply_payload.buffer.size; |
917a718d | 1831 | |
28ab034a JG |
1832 | ret_code = cmd_list_channels( |
1833 | cmd_ctx->lsm.domain.type, cmd_ctx->session, &cmd_ctx->reply_payload); | |
999af9c1 JR |
1834 | if (ret_code != LTTNG_OK) { |
1835 | ret = (int) ret_code; | |
1836 | goto error; | |
917a718d JG |
1837 | } |
1838 | ||
28ab034a JG |
1839 | payload_size = cmd_ctx->reply_payload.buffer.size - command_header_size - |
1840 | original_payload_size; | |
999af9c1 JR |
1841 | update_lttng_msg(cmd_ctx, command_header_size, payload_size); |
1842 | ||
917a718d JG |
1843 | ret = LTTNG_OK; |
1844 | break; | |
1845 | } | |
37a5ef39 | 1846 | case LTTCOMM_SESSIOND_COMMAND_LIST_EVENTS: |
917a718d | 1847 | { |
8ddd72ef | 1848 | enum lttng_error_code ret_code; |
e368fb43 JG |
1849 | size_t original_payload_size; |
1850 | size_t payload_size; | |
8ddd72ef | 1851 | const size_t command_header_size = sizeof(struct lttcomm_list_command_header); |
e368fb43 JG |
1852 | |
1853 | ret = setup_empty_lttng_msg(cmd_ctx); | |
1854 | if (ret) { | |
1855 | ret = LTTNG_ERR_NOMEM; | |
1856 | goto setup_error; | |
917a718d JG |
1857 | } |
1858 | ||
e368fb43 | 1859 | original_payload_size = cmd_ctx->reply_payload.buffer.size; |
917a718d | 1860 | |
8ddd72ef | 1861 | ret_code = cmd_list_events(cmd_ctx->lsm.domain.type, |
28ab034a JG |
1862 | cmd_ctx->session, |
1863 | cmd_ctx->lsm.u.list.channel_name, | |
1864 | &cmd_ctx->reply_payload); | |
8ddd72ef JR |
1865 | if (ret_code != LTTNG_OK) { |
1866 | ret = (int) ret_code; | |
e368fb43 | 1867 | goto error; |
917a718d JG |
1868 | } |
1869 | ||
28ab034a JG |
1870 | payload_size = cmd_ctx->reply_payload.buffer.size - command_header_size - |
1871 | original_payload_size; | |
8ddd72ef | 1872 | update_lttng_msg(cmd_ctx, command_header_size, payload_size); |
e368fb43 | 1873 | |
917a718d JG |
1874 | ret = LTTNG_OK; |
1875 | break; | |
1876 | } | |
37a5ef39 | 1877 | case LTTCOMM_SESSIOND_COMMAND_LIST_SESSIONS: |
917a718d JG |
1878 | { |
1879 | unsigned int nr_sessions; | |
64803277 SM |
1880 | lttng_session *sessions_payload = nullptr; |
1881 | size_t payload_len = 0; | |
917a718d JG |
1882 | |
1883 | session_lock_list(); | |
28ab034a JG |
1884 | nr_sessions = lttng_sessions_count(LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
1885 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e | 1886 | |
64803277 | 1887 | if (nr_sessions > 0) { |
28ab034a JG |
1888 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + |
1889 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
64803277 SM |
1890 | sessions_payload = zmalloc<lttng_session>(payload_len); |
1891 | if (!sessions_payload) { | |
1892 | session_unlock_list(); | |
1893 | ret = -ENOMEM; | |
1894 | goto setup_error; | |
1895 | } | |
917a718d | 1896 | |
28ab034a JG |
1897 | cmd_list_lttng_sessions(sessions_payload, |
1898 | nr_sessions, | |
1899 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1900 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
917a718d JG |
1901 | } |
1902 | ||
917a718d JG |
1903 | session_unlock_list(); |
1904 | ||
28ab034a | 1905 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, payload_len); |
917a718d JG |
1906 | free(sessions_payload); |
1907 | ||
1908 | if (ret < 0) { | |
1909 | goto setup_error; | |
1910 | } | |
1911 | ||
1912 | ret = LTTNG_OK; | |
1913 | break; | |
1914 | } | |
37a5ef39 | 1915 | case LTTCOMM_SESSIOND_COMMAND_REGISTER_CONSUMER: |
917a718d JG |
1916 | { |
1917 | struct consumer_data *cdata; | |
1918 | ||
3a91de3a | 1919 | switch (cmd_ctx->lsm.domain.type) { |
917a718d | 1920 | case LTTNG_DOMAIN_KERNEL: |
412d7227 | 1921 | cdata = &the_kconsumer_data; |
917a718d JG |
1922 | break; |
1923 | default: | |
1924 | ret = LTTNG_ERR_UND; | |
1925 | goto error; | |
1926 | } | |
1927 | ||
28ab034a JG |
1928 | ret = cmd_register_consumer( |
1929 | cmd_ctx->session, cmd_ctx->lsm.domain.type, cmd_ctx->lsm.u.reg.path, cdata); | |
917a718d JG |
1930 | break; |
1931 | } | |
49cddecd KS |
1932 | case LTTCOMM_SESSIOND_COMMAND_KERNEL_TRACER_STATUS: |
1933 | { | |
1934 | uint32_t u_status; | |
1935 | enum lttng_kernel_tracer_status status; | |
1936 | ||
1937 | ret = cmd_kernel_tracer_status(&status); | |
1938 | if (ret != LTTNG_OK) { | |
1939 | goto error; | |
1940 | } | |
1941 | ||
1942 | u_status = (uint32_t) status; | |
1943 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &u_status, 4); | |
1944 | if (ret < 0) { | |
1945 | goto error; | |
1946 | } | |
1947 | ||
1948 | ret = LTTNG_OK; | |
1949 | break; | |
1950 | } | |
37a5ef39 | 1951 | case LTTCOMM_SESSIOND_COMMAND_DATA_PENDING: |
917a718d JG |
1952 | { |
1953 | int pending_ret; | |
1954 | uint8_t pending_ret_byte; | |
1955 | ||
1956 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
1957 | ||
1958 | /* | |
1959 | * FIXME | |
1960 | * | |
1961 | * This function may returns 0 or 1 to indicate whether or not | |
1962 | * there is data pending. In case of error, it should return an | |
1963 | * LTTNG_ERR code. However, some code paths may still return | |
1964 | * a nondescript error code, which we handle by returning an | |
1965 | * "unknown" error. | |
1966 | */ | |
1967 | if (pending_ret == 0 || pending_ret == 1) { | |
1968 | /* | |
1969 | * ret will be set to LTTNG_OK at the end of | |
1970 | * this function. | |
1971 | */ | |
f0a9c004 | 1972 | } else if (pending_ret <= LTTNG_OK || pending_ret >= LTTNG_ERR_NR) { |
917a718d | 1973 | ret = LTTNG_ERR_UNK; |
f0a9c004 | 1974 | goto error; |
917a718d JG |
1975 | } else { |
1976 | ret = pending_ret; | |
f0a9c004 | 1977 | goto error; |
917a718d JG |
1978 | } |
1979 | ||
1980 | pending_ret_byte = (uint8_t) pending_ret; | |
1981 | ||
1982 | /* 1 byte to return whether or not data is pending */ | |
28ab034a | 1983 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &pending_ret_byte, 1); |
917a718d JG |
1984 | |
1985 | if (ret < 0) { | |
1986 | goto setup_error; | |
1987 | } | |
1988 | ||
1989 | ret = LTTNG_OK; | |
1990 | break; | |
1991 | } | |
37a5ef39 | 1992 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_ADD_OUTPUT: |
917a718d | 1993 | { |
a914e76a | 1994 | uint32_t snapshot_id; |
917a718d | 1995 | struct lttcomm_lttng_output_id reply; |
7966af57 | 1996 | lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output; |
917a718d | 1997 | |
28ab034a | 1998 | ret = cmd_snapshot_add_output(cmd_ctx->session, &output, &snapshot_id); |
917a718d JG |
1999 | if (ret != LTTNG_OK) { |
2000 | goto error; | |
2001 | } | |
a914e76a | 2002 | reply.id = snapshot_id; |
917a718d | 2003 | |
28ab034a | 2004 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, sizeof(reply)); |
917a718d JG |
2005 | if (ret < 0) { |
2006 | goto setup_error; | |
2007 | } | |
2008 | ||
2009 | /* Copy output list into message payload */ | |
2010 | ret = LTTNG_OK; | |
2011 | break; | |
2012 | } | |
37a5ef39 | 2013 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_DEL_OUTPUT: |
917a718d | 2014 | { |
7966af57 SM |
2015 | lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output; |
2016 | ret = cmd_snapshot_del_output(cmd_ctx->session, &output); | |
917a718d JG |
2017 | break; |
2018 | } | |
37a5ef39 | 2019 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_LIST_OUTPUT: |
917a718d JG |
2020 | { |
2021 | ssize_t nb_output; | |
cd9adb8b | 2022 | struct lttng_snapshot_output *outputs = nullptr; |
917a718d JG |
2023 | |
2024 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
2025 | if (nb_output < 0) { | |
2026 | ret = -nb_output; | |
2027 | goto error; | |
2028 | } | |
2029 | ||
a0377dfe | 2030 | LTTNG_ASSERT((nb_output > 0 && outputs) || nb_output == 0); |
28ab034a JG |
2031 | ret = setup_lttng_msg_no_cmd_header( |
2032 | cmd_ctx, outputs, nb_output * sizeof(struct lttng_snapshot_output)); | |
917a718d JG |
2033 | free(outputs); |
2034 | ||
2035 | if (ret < 0) { | |
2036 | goto setup_error; | |
2037 | } | |
2038 | ||
2039 | ret = LTTNG_OK; | |
2040 | break; | |
2041 | } | |
37a5ef39 | 2042 | case LTTCOMM_SESSIOND_COMMAND_SNAPSHOT_RECORD: |
917a718d | 2043 | { |
7966af57 | 2044 | lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_record.output; |
28ab034a JG |
2045 | ret = cmd_snapshot_record(cmd_ctx->session, &output, 0); // RFC: set to zero since |
2046 | // it's ignored by | |
2047 | // cmd_snapshot_record | |
917a718d JG |
2048 | break; |
2049 | } | |
37a5ef39 | 2050 | case LTTCOMM_SESSIOND_COMMAND_CREATE_SESSION_EXT: |
917a718d | 2051 | { |
b178f53e | 2052 | struct lttng_dynamic_buffer payload; |
cd9adb8b | 2053 | struct lttng_session_descriptor *return_descriptor = nullptr; |
917a718d | 2054 | |
b178f53e | 2055 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 2056 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
2057 | if (ret != LTTNG_OK) { |
2058 | goto error; | |
917a718d JG |
2059 | } |
2060 | ||
28ab034a | 2061 | ret = lttng_session_descriptor_serialize(return_descriptor, &payload); |
b178f53e JG |
2062 | if (ret) { |
2063 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
2064 | lttng_session_descriptor_destroy(return_descriptor); | |
2065 | ret = LTTNG_ERR_NOMEM; | |
2066 | goto error; | |
917a718d | 2067 | } |
28ab034a | 2068 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, payload.size); |
b178f53e JG |
2069 | if (ret) { |
2070 | lttng_session_descriptor_destroy(return_descriptor); | |
2071 | ret = LTTNG_ERR_NOMEM; | |
2072 | goto error; | |
2073 | } | |
2074 | lttng_dynamic_buffer_reset(&payload); | |
2075 | lttng_session_descriptor_destroy(return_descriptor); | |
2076 | ret = LTTNG_OK; | |
917a718d JG |
2077 | break; |
2078 | } | |
37a5ef39 | 2079 | case LTTCOMM_SESSIOND_COMMAND_SAVE_SESSION: |
917a718d | 2080 | { |
28ab034a | 2081 | ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr, &cmd_ctx->creds); |
917a718d JG |
2082 | break; |
2083 | } | |
37a5ef39 | 2084 | case LTTCOMM_SESSIOND_COMMAND_SET_SESSION_SHM_PATH: |
917a718d JG |
2085 | { |
2086 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
28ab034a | 2087 | cmd_ctx->lsm.u.set_shm_path.shm_path); |
917a718d JG |
2088 | break; |
2089 | } | |
37a5ef39 | 2090 | case LTTCOMM_SESSIOND_COMMAND_REGENERATE_METADATA: |
917a718d JG |
2091 | { |
2092 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
2093 | break; | |
2094 | } | |
37a5ef39 | 2095 | case LTTCOMM_SESSIOND_COMMAND_REGENERATE_STATEDUMP: |
917a718d JG |
2096 | { |
2097 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
2098 | break; | |
2099 | } | |
37a5ef39 | 2100 | case LTTCOMM_SESSIOND_COMMAND_REGISTER_TRIGGER: |
917a718d | 2101 | { |
746e08d7 | 2102 | struct lttng_trigger *payload_trigger; |
242388e4 | 2103 | struct lttng_trigger *return_trigger; |
746e08d7 JG |
2104 | size_t original_reply_payload_size; |
2105 | size_t reply_payload_size; | |
2106 | const struct lttng_credentials cmd_creds = { | |
2107 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2108 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2109 | }; | |
242388e4 JR |
2110 | |
2111 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2112 | if (ret) { | |
2113 | ret = LTTNG_ERR_NOMEM; | |
2114 | goto setup_error; | |
2115 | } | |
2116 | ||
28ab034a | 2117 | ret = receive_lttng_trigger(cmd_ctx, *sock, sock_error, &payload_trigger); |
746e08d7 JG |
2118 | if (ret != LTTNG_OK) { |
2119 | goto error; | |
2120 | } | |
2121 | ||
2122 | original_reply_payload_size = cmd_ctx->reply_payload.buffer.size; | |
242388e4 | 2123 | |
28ab034a JG |
2124 | ret = cmd_register_trigger(&cmd_creds, |
2125 | payload_trigger, | |
2126 | cmd_ctx->lsm.u.trigger.is_trigger_anonymous, | |
2127 | the_notification_thread_handle, | |
2128 | &return_trigger); | |
242388e4 | 2129 | if (ret != LTTNG_OK) { |
746e08d7 | 2130 | lttng_trigger_put(payload_trigger); |
242388e4 JR |
2131 | goto error; |
2132 | } | |
2133 | ||
2134 | ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload); | |
746e08d7 JG |
2135 | lttng_trigger_put(payload_trigger); |
2136 | lttng_trigger_put(return_trigger); | |
242388e4 JR |
2137 | if (ret) { |
2138 | ERR("Failed to serialize trigger in reply to \"register trigger\" command"); | |
2139 | ret = LTTNG_ERR_NOMEM; | |
242388e4 JR |
2140 | goto error; |
2141 | } | |
2142 | ||
28ab034a JG |
2143 | reply_payload_size = |
2144 | cmd_ctx->reply_payload.buffer.size - original_reply_payload_size; | |
242388e4 | 2145 | |
746e08d7 | 2146 | update_lttng_msg(cmd_ctx, 0, reply_payload_size); |
242388e4 JR |
2147 | |
2148 | ret = LTTNG_OK; | |
917a718d JG |
2149 | break; |
2150 | } | |
37a5ef39 | 2151 | case LTTCOMM_SESSIOND_COMMAND_UNREGISTER_TRIGGER: |
917a718d | 2152 | { |
746e08d7 JG |
2153 | struct lttng_trigger *payload_trigger; |
2154 | const struct lttng_credentials cmd_creds = { | |
2155 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2156 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2157 | }; | |
2158 | ||
28ab034a | 2159 | ret = receive_lttng_trigger(cmd_ctx, *sock, sock_error, &payload_trigger); |
746e08d7 JG |
2160 | if (ret != LTTNG_OK) { |
2161 | goto error; | |
2162 | } | |
2163 | ||
28ab034a JG |
2164 | ret = cmd_unregister_trigger( |
2165 | &cmd_creds, payload_trigger, the_notification_thread_handle); | |
746e08d7 | 2166 | lttng_trigger_put(payload_trigger); |
917a718d JG |
2167 | break; |
2168 | } | |
37a5ef39 | 2169 | case LTTCOMM_SESSIOND_COMMAND_ROTATE_SESSION: |
917a718d JG |
2170 | { |
2171 | struct lttng_rotate_session_return rotate_return; | |
2172 | ||
2173 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
2174 | ||
2175 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
2176 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2177 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2178 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2179 | goto error; | |
2180 | } | |
2181 | ||
28ab034a JG |
2182 | ret = cmd_rotate_session(cmd_ctx->session, |
2183 | &rotate_return, | |
2184 | false, | |
2185 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
917a718d JG |
2186 | if (ret < 0) { |
2187 | ret = -ret; | |
2188 | goto error; | |
2189 | } | |
2190 | ||
28ab034a | 2191 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, sizeof(rotate_return)); |
917a718d JG |
2192 | if (ret < 0) { |
2193 | ret = -ret; | |
2194 | goto error; | |
2195 | } | |
2196 | ||
2197 | ret = LTTNG_OK; | |
2198 | break; | |
2199 | } | |
37a5ef39 | 2200 | case LTTCOMM_SESSIOND_COMMAND_ROTATION_GET_INFO: |
917a718d JG |
2201 | { |
2202 | struct lttng_rotation_get_info_return get_info_return; | |
2203 | ||
2204 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
28ab034a JG |
2205 | ret = cmd_rotate_get_info(cmd_ctx->session, |
2206 | &get_info_return, | |
2207 | cmd_ctx->lsm.u.get_rotation_info.rotation_id); | |
917a718d JG |
2208 | if (ret < 0) { |
2209 | ret = -ret; | |
2210 | goto error; | |
2211 | } | |
2212 | ||
28ab034a JG |
2213 | ret = setup_lttng_msg_no_cmd_header( |
2214 | cmd_ctx, &get_info_return, sizeof(get_info_return)); | |
917a718d JG |
2215 | if (ret < 0) { |
2216 | ret = -ret; | |
2217 | goto error; | |
2218 | } | |
2219 | ||
2220 | ret = LTTNG_OK; | |
2221 | break; | |
2222 | } | |
37a5ef39 | 2223 | case LTTCOMM_SESSIOND_COMMAND_ROTATION_SET_SCHEDULE: |
917a718d JG |
2224 | { |
2225 | bool set_schedule; | |
2226 | enum lttng_rotation_schedule_type schedule_type; | |
2227 | uint64_t value; | |
2228 | ||
2229 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
2230 | DBG("Kernel tracer version does not support session rotations"); | |
2231 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
2232 | goto error; | |
2233 | } | |
2234 | ||
3a91de3a | 2235 | set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1; |
28ab034a JG |
2236 | schedule_type = (enum lttng_rotation_schedule_type) |
2237 | cmd_ctx->lsm.u.rotation_set_schedule.type; | |
3a91de3a | 2238 | value = cmd_ctx->lsm.u.rotation_set_schedule.value; |
917a718d | 2239 | |
28f23191 JG |
2240 | ret = cmd_rotation_set_schedule( |
2241 | cmd_ctx->session, set_schedule, schedule_type, value); | |
917a718d JG |
2242 | if (ret != LTTNG_OK) { |
2243 | goto error; | |
2244 | } | |
2245 | ||
2246 | break; | |
2247 | } | |
37a5ef39 | 2248 | case LTTCOMM_SESSIOND_COMMAND_SESSION_LIST_ROTATION_SCHEDULES: |
917a718d | 2249 | { |
7966af57 SM |
2250 | lttng_session_list_schedules_return schedules; |
2251 | ||
2252 | schedules.periodic.set = !!cmd_ctx->session->rotate_timer_period; | |
2253 | schedules.periodic.value = cmd_ctx->session->rotate_timer_period; | |
2254 | schedules.size.set = !!cmd_ctx->session->rotate_size; | |
2255 | schedules.size.value = cmd_ctx->session->rotate_size; | |
917a718d | 2256 | |
28ab034a | 2257 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, sizeof(schedules)); |
917a718d JG |
2258 | if (ret < 0) { |
2259 | ret = -ret; | |
2260 | goto error; | |
2261 | } | |
2262 | ||
2263 | ret = LTTNG_OK; | |
2264 | break; | |
2265 | } | |
37a5ef39 | 2266 | case LTTCOMM_SESSIOND_COMMAND_CLEAR_SESSION: |
022349df MD |
2267 | { |
2268 | ret = cmd_clear_session(cmd_ctx->session, sock); | |
2269 | break; | |
2270 | } | |
37a5ef39 | 2271 | case LTTCOMM_SESSIOND_COMMAND_LIST_TRIGGERS: |
fbc9f37d | 2272 | { |
cd9adb8b | 2273 | struct lttng_triggers *return_triggers = nullptr; |
fbc9f37d JR |
2274 | size_t original_payload_size; |
2275 | size_t payload_size; | |
2276 | ||
2277 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2278 | if (ret) { | |
2279 | ret = LTTNG_ERR_NOMEM; | |
2280 | goto setup_error; | |
2281 | } | |
2282 | ||
2283 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2284 | ||
28ab034a | 2285 | ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle, &return_triggers); |
fbc9f37d JR |
2286 | if (ret != LTTNG_OK) { |
2287 | goto error; | |
2288 | } | |
2289 | ||
a0377dfe | 2290 | LTTNG_ASSERT(return_triggers); |
28ab034a | 2291 | ret = lttng_triggers_serialize(return_triggers, &cmd_ctx->reply_payload); |
fbc9f37d JR |
2292 | lttng_triggers_destroy(return_triggers); |
2293 | if (ret) { | |
2294 | ERR("Failed to serialize triggers in reply to `list triggers` command"); | |
2295 | ret = LTTNG_ERR_NOMEM; | |
2296 | goto error; | |
2297 | } | |
2298 | ||
28ab034a | 2299 | payload_size = cmd_ctx->reply_payload.buffer.size - original_payload_size; |
fbc9f37d JR |
2300 | |
2301 | update_lttng_msg(cmd_ctx, 0, payload_size); | |
2302 | ||
2303 | ret = LTTNG_OK; | |
2304 | break; | |
2305 | } | |
37a5ef39 | 2306 | case LTTCOMM_SESSIOND_COMMAND_EXECUTE_ERROR_QUERY: |
588c4b0d JG |
2307 | { |
2308 | struct lttng_error_query *query; | |
2309 | const struct lttng_credentials cmd_creds = { | |
2310 | .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid), | |
2311 | .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid), | |
2312 | }; | |
cd9adb8b | 2313 | struct lttng_error_query_results *results = nullptr; |
588c4b0d JG |
2314 | size_t original_payload_size; |
2315 | size_t payload_size; | |
2316 | ||
2317 | ret = setup_empty_lttng_msg(cmd_ctx); | |
2318 | if (ret) { | |
2319 | ret = LTTNG_ERR_NOMEM; | |
2320 | goto setup_error; | |
2321 | } | |
2322 | ||
2323 | original_payload_size = cmd_ctx->reply_payload.buffer.size; | |
2324 | ||
28ab034a | 2325 | ret = receive_lttng_error_query(cmd_ctx, *sock, sock_error, &query); |
588c4b0d JG |
2326 | if (ret != LTTNG_OK) { |
2327 | goto error; | |
2328 | } | |
2329 | ||
28ab034a JG |
2330 | ret = cmd_execute_error_query( |
2331 | &cmd_creds, query, &results, the_notification_thread_handle); | |
588c4b0d JG |
2332 | lttng_error_query_destroy(query); |
2333 | if (ret != LTTNG_OK) { | |
2334 | goto error; | |
2335 | } | |
2336 | ||
a0377dfe | 2337 | LTTNG_ASSERT(results); |
28ab034a | 2338 | ret = lttng_error_query_results_serialize(results, &cmd_ctx->reply_payload); |
588c4b0d JG |
2339 | lttng_error_query_results_destroy(results); |
2340 | if (ret) { | |
2341 | ERR("Failed to serialize error query result set in reply to `execute error query` command"); | |
2342 | ret = LTTNG_ERR_NOMEM; | |
2343 | goto error; | |
2344 | } | |
2345 | ||
28ab034a | 2346 | payload_size = cmd_ctx->reply_payload.buffer.size - original_payload_size; |
588c4b0d JG |
2347 | |
2348 | update_lttng_msg(cmd_ctx, 0, payload_size); | |
2349 | ||
2350 | ret = LTTNG_OK; | |
2351 | ||
2352 | break; | |
2353 | } | |
917a718d JG |
2354 | default: |
2355 | ret = LTTNG_ERR_UND; | |
2356 | break; | |
2357 | } | |
2358 | ||
2359 | error: | |
3a91de3a JG |
2360 | if (cmd_ctx->reply_payload.buffer.size == 0) { |
2361 | DBG("Missing llm header, creating one."); | |
cd9adb8b | 2362 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, nullptr, 0) < 0) { |
917a718d JG |
2363 | goto setup_error; |
2364 | } | |
2365 | } | |
2366 | /* Set return code */ | |
3a91de3a | 2367 | ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret; |
917a718d JG |
2368 | setup_error: |
2369 | if (cmd_ctx->session) { | |
2370 | session_unlock(cmd_ctx->session); | |
2371 | session_put(cmd_ctx->session); | |
cd9adb8b | 2372 | cmd_ctx->session = nullptr; |
917a718d JG |
2373 | } |
2374 | if (need_tracing_session) { | |
2375 | session_unlock_list(); | |
2376 | } | |
2377 | init_setup_error: | |
a0377dfe | 2378 | LTTNG_ASSERT(!rcu_read_ongoing()); |
917a718d JG |
2379 | return ret; |
2380 | } | |
2381 | ||
cd9adb8b | 2382 | static int create_client_sock() |
917a718d JG |
2383 | { |
2384 | int ret, client_sock; | |
917a718d JG |
2385 | |
2386 | /* Create client tool unix socket */ | |
28ab034a | 2387 | client_sock = lttcomm_create_unix_sock(the_config.client_unix_sock_path.value); |
917a718d | 2388 | if (client_sock < 0) { |
28ab034a | 2389 | ERR("Create unix sock failed: %s", the_config.client_unix_sock_path.value); |
917a718d JG |
2390 | ret = -1; |
2391 | goto end; | |
2392 | } | |
2393 | ||
2394 | /* Set the cloexec flag */ | |
2395 | ret = utils_set_fd_cloexec(client_sock); | |
2396 | if (ret < 0) { | |
2397 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
28ab034a JG |
2398 | "Continuing but note that the consumer daemon will have a " |
2399 | "reference to this socket on exec()", | |
2400 | client_sock); | |
917a718d JG |
2401 | } |
2402 | ||
2403 | /* File permission MUST be 660 */ | |
28ab034a | 2404 | ret = chmod(the_config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
917a718d | 2405 | if (ret < 0) { |
28ab034a | 2406 | ERR("Set file permissions failed: %s", the_config.client_unix_sock_path.value); |
917a718d | 2407 | PERROR("chmod"); |
18972083 JR |
2408 | (void) lttcomm_close_unix_sock(client_sock); |
2409 | ret = -1; | |
917a718d JG |
2410 | goto end; |
2411 | } | |
2412 | DBG("Created client socket (fd = %i)", client_sock); | |
2413 | ret = client_sock; | |
2414 | end: | |
917a718d JG |
2415 | return ret; |
2416 | } | |
2417 | ||
2418 | static void cleanup_client_thread(void *data) | |
2419 | { | |
7966af57 | 2420 | struct lttng_pipe *quit_pipe = (lttng_pipe *) data; |
917a718d JG |
2421 | |
2422 | lttng_pipe_destroy(quit_pipe); | |
2423 | } | |
2424 | ||
f46376a1 | 2425 | static void thread_init_cleanup(void *data __attribute__((unused))) |
6cb45e93 JG |
2426 | { |
2427 | set_thread_status(false); | |
2428 | } | |
2429 | ||
917a718d JG |
2430 | /* |
2431 | * This thread manage all clients request using the unix client socket for | |
2432 | * communication. | |
2433 | */ | |
2434 | static void *thread_manage_clients(void *data) | |
2435 | { | |
8a00688e | 2436 | int sock = -1, ret, i, err = -1; |
917a718d | 2437 | int sock_error; |
8a00688e | 2438 | uint32_t nb_fd; |
917a718d | 2439 | struct lttng_poll_event events; |
0f68efb6 | 2440 | const int client_sock = thread_state.client_sock; |
7966af57 | 2441 | struct lttng_pipe *quit_pipe = (lttng_pipe *) data; |
917a718d | 2442 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); |
3a91de3a | 2443 | struct command_ctx cmd_ctx = {}; |
917a718d JG |
2444 | |
2445 | DBG("[thread] Manage client started"); | |
2446 | ||
3a91de3a JG |
2447 | lttng_payload_init(&cmd_ctx.reply_payload); |
2448 | ||
917a718d JG |
2449 | is_root = (getuid() == 0); |
2450 | ||
cd9adb8b | 2451 | pthread_cleanup_push(thread_init_cleanup, nullptr); |
917a718d JG |
2452 | |
2453 | rcu_register_thread(); | |
2454 | ||
412d7227 | 2455 | health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
917a718d JG |
2456 | |
2457 | health_code_update(); | |
2458 | ||
2459 | ret = lttcomm_listen_unix_sock(client_sock); | |
2460 | if (ret < 0) { | |
2461 | goto error_listen; | |
2462 | } | |
2463 | ||
2464 | /* | |
2465 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2466 | * more will be added to this poll set. | |
2467 | */ | |
2468 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2469 | if (ret < 0) { | |
2470 | goto error_create_poll; | |
2471 | } | |
2472 | ||
2473 | /* Add the application registration socket */ | |
2474 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2475 | if (ret < 0) { | |
2476 | goto error; | |
2477 | } | |
2478 | ||
2479 | /* Add thread quit pipe */ | |
1524f98c | 2480 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN); |
917a718d JG |
2481 | if (ret < 0) { |
2482 | goto error; | |
2483 | } | |
2484 | ||
6cb45e93 | 2485 | /* Set state as running. */ |
0d163d56 | 2486 | set_thread_status(true); |
6cb45e93 JG |
2487 | pthread_cleanup_pop(0); |
2488 | ||
917a718d JG |
2489 | /* This testpoint is after we signal readiness to the parent. */ |
2490 | if (testpoint(sessiond_thread_manage_clients)) { | |
2491 | goto error; | |
2492 | } | |
2493 | ||
2494 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2495 | goto error; | |
2496 | } | |
2497 | ||
2498 | health_code_update(); | |
2499 | ||
cd9adb8b | 2500 | while (true) { |
917a718d JG |
2501 | const struct cmd_completion_handler *cmd_completion_handler; |
2502 | ||
7966af57 SM |
2503 | cmd_ctx.creds.uid = UINT32_MAX; |
2504 | cmd_ctx.creds.gid = UINT32_MAX; | |
2505 | cmd_ctx.creds.pid = 0; | |
cd9adb8b | 2506 | cmd_ctx.session = nullptr; |
fe489250 | 2507 | lttng_payload_clear(&cmd_ctx.reply_payload); |
e368fb43 | 2508 | cmd_ctx.lttng_msg_size = 0; |
3a91de3a | 2509 | |
917a718d JG |
2510 | DBG("Accepting client command ..."); |
2511 | ||
2512 | /* Inifinite blocking call, waiting for transmission */ | |
2513 | restart: | |
2514 | health_poll_entry(); | |
2515 | ret = lttng_poll_wait(&events, -1); | |
2516 | health_poll_exit(); | |
2517 | if (ret < 0) { | |
2518 | /* | |
2519 | * Restart interrupted system call. | |
2520 | */ | |
2521 | if (errno == EINTR) { | |
2522 | goto restart; | |
2523 | } | |
2524 | goto error; | |
2525 | } | |
2526 | ||
2527 | nb_fd = ret; | |
2528 | ||
2529 | for (i = 0; i < nb_fd; i++) { | |
8a00688e MJ |
2530 | /* Fetch once the poll data. */ |
2531 | const auto revents = LTTNG_POLL_GETEV(&events, i); | |
2532 | const auto pollfd = LTTNG_POLL_GETFD(&events, i); | |
917a718d JG |
2533 | |
2534 | health_code_update(); | |
2535 | ||
8a00688e | 2536 | /* Activity on thread quit pipe, exiting. */ |
917a718d | 2537 | if (pollfd == thread_quit_pipe_fd) { |
8a00688e | 2538 | DBG("Activity on thread quit pipe"); |
917a718d JG |
2539 | err = 0; |
2540 | goto exit; | |
8a00688e MJ |
2541 | } |
2542 | ||
2543 | /* Event on the registration socket */ | |
2544 | if (revents & LPOLLIN) { | |
2545 | continue; | |
2546 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2547 | ERR("Client socket poll error"); | |
2548 | goto error; | |
917a718d | 2549 | } else { |
8a00688e MJ |
2550 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
2551 | goto error; | |
917a718d JG |
2552 | } |
2553 | } | |
2554 | ||
2555 | DBG("Wait for client response"); | |
2556 | ||
2557 | health_code_update(); | |
2558 | ||
2559 | sock = lttcomm_accept_unix_sock(client_sock); | |
2560 | if (sock < 0) { | |
2561 | goto error; | |
2562 | } | |
2563 | ||
2564 | /* | |
2565 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2566 | * show must go on. | |
2567 | */ | |
2568 | (void) utils_set_fd_cloexec(sock); | |
2569 | ||
2570 | /* Set socket option for credentials retrieval */ | |
2571 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2572 | if (ret < 0) { | |
2573 | goto error; | |
2574 | } | |
2575 | ||
917a718d JG |
2576 | health_code_update(); |
2577 | ||
2578 | /* | |
2579 | * Data is received from the lttng client. The struct | |
2580 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2581 | * the client. | |
2582 | */ | |
2583 | DBG("Receiving data from client ..."); | |
28ab034a JG |
2584 | ret = lttcomm_recv_creds_unix_sock( |
2585 | sock, &cmd_ctx.lsm, sizeof(struct lttcomm_session_msg), &cmd_ctx.creds); | |
3a91de3a JG |
2586 | if (ret != sizeof(struct lttcomm_session_msg)) { |
2587 | DBG("Incomplete recv() from client... continuing"); | |
917a718d JG |
2588 | ret = close(sock); |
2589 | if (ret) { | |
2590 | PERROR("close"); | |
2591 | } | |
2592 | sock = -1; | |
917a718d JG |
2593 | continue; |
2594 | } | |
2595 | ||
2596 | health_code_update(); | |
2597 | ||
2598 | // TODO: Validate cmd_ctx including sanity check for | |
2599 | // security purpose. | |
2600 | ||
2601 | rcu_thread_online(); | |
2602 | /* | |
2603 | * This function dispatch the work to the kernel or userspace tracer | |
2604 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2605 | * informations for the client. The command context struct contains | |
2606 | * everything this function may needs. | |
2607 | */ | |
dd7ef124 JG |
2608 | try { |
2609 | ret = process_client_msg(&cmd_ctx, &sock, &sock_error); | |
2610 | rcu_thread_offline(); | |
2611 | if (ret < 0) { | |
2612 | if (sock >= 0) { | |
2613 | ret = close(sock); | |
2614 | if (ret) { | |
2615 | PERROR("close"); | |
2616 | } | |
3e3665b8 | 2617 | } |
dd7ef124 JG |
2618 | sock = -1; |
2619 | /* | |
2620 | * TODO: Inform client somehow of the fatal error. At | |
2621 | * this point, ret < 0 means that a zmalloc failed | |
2622 | * (ENOMEM). Error detected but still accept | |
2623 | * command, unless a socket error has been | |
2624 | * detected. | |
2625 | */ | |
2626 | continue; | |
4a76dfd3 | 2627 | } |
dd7ef124 JG |
2628 | } catch (const std::bad_alloc& ex) { |
2629 | WARN_FMT("Failed to allocate memory while handling client request: {}", | |
2630 | ex.what()); | |
2631 | ret = LTTNG_ERR_NOMEM; | |
2632 | } catch (const lttng::ctl::error& ex) { | |
2633 | WARN_FMT("Client request failed: {}", ex.what()); | |
2634 | ret = ex.code(); | |
2635 | } catch (const std::exception& ex) { | |
2636 | WARN_FMT("Client request failed: {}", ex.what()); | |
2637 | ret = LTTNG_ERR_UNK; | |
917a718d JG |
2638 | } |
2639 | ||
c7e9ffbd | 2640 | if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) { |
7e397c55 | 2641 | WARN("Command returned an invalid status code, returning unknown error: " |
28ab034a JG |
2642 | "command type = %s (%d), ret = %d", |
2643 | lttcomm_sessiond_command_str( | |
2644 | (lttcomm_sessiond_command) cmd_ctx.lsm.cmd_type), | |
2645 | cmd_ctx.lsm.cmd_type, | |
2646 | ret); | |
c7e9ffbd JG |
2647 | ret = LTTNG_ERR_UNK; |
2648 | } | |
2649 | ||
917a718d JG |
2650 | cmd_completion_handler = cmd_pop_completion_handler(); |
2651 | if (cmd_completion_handler) { | |
2652 | enum lttng_error_code completion_code; | |
2653 | ||
28ab034a | 2654 | completion_code = cmd_completion_handler->run(cmd_completion_handler->data); |
917a718d | 2655 | if (completion_code != LTTNG_OK) { |
917a718d JG |
2656 | continue; |
2657 | } | |
2658 | } | |
2659 | ||
2660 | health_code_update(); | |
2661 | ||
3e3665b8 | 2662 | if (sock >= 0) { |
3a91de3a | 2663 | struct lttng_payload_view view = |
28ab034a JG |
2664 | lttng_payload_view_from_payload(&cmd_ctx.reply_payload, 0, -1); |
2665 | struct lttcomm_lttng_msg *llm = | |
2666 | (typeof(llm)) cmd_ctx.reply_payload.buffer.data; | |
3a91de3a | 2667 | |
a0377dfe FD |
2668 | LTTNG_ASSERT(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm)); |
2669 | LTTNG_ASSERT(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size); | |
3a91de3a | 2670 | |
fe489250 | 2671 | llm->fd_count = lttng_payload_view_get_fd_handle_count(&view); |
e368fb43 | 2672 | |
3e3665b8 | 2673 | DBG("Sending response (size: %d, retcode: %s (%d))", |
28ab034a JG |
2674 | cmd_ctx.lttng_msg_size, |
2675 | lttng_strerror(-llm->ret_code), | |
2676 | llm->ret_code); | |
3a91de3a | 2677 | ret = send_unix_sock(sock, &view); |
3e3665b8 JG |
2678 | if (ret < 0) { |
2679 | ERR("Failed to send data back to client"); | |
2680 | } | |
917a718d | 2681 | |
3e3665b8 JG |
2682 | /* End of transmission */ |
2683 | ret = close(sock); | |
2684 | if (ret) { | |
2685 | PERROR("close"); | |
2686 | } | |
4a76dfd3 JR |
2687 | } |
2688 | sock = -1; | |
917a718d | 2689 | |
917a718d JG |
2690 | health_code_update(); |
2691 | } | |
2692 | ||
2693 | exit: | |
2694 | error: | |
2695 | if (sock >= 0) { | |
2696 | ret = close(sock); | |
2697 | if (ret) { | |
2698 | PERROR("close"); | |
2699 | } | |
2700 | } | |
2701 | ||
2702 | lttng_poll_clean(&events); | |
917a718d JG |
2703 | |
2704 | error_listen: | |
2705 | error_create_poll: | |
412d7227 | 2706 | unlink(the_config.client_unix_sock_path.value); |
0f68efb6 JG |
2707 | ret = close(client_sock); |
2708 | if (ret) { | |
2709 | PERROR("close"); | |
917a718d JG |
2710 | } |
2711 | ||
2712 | if (err) { | |
2713 | health_error(); | |
2714 | ERR("Health error occurred in %s", __func__); | |
2715 | } | |
2716 | ||
412d7227 | 2717 | health_unregister(the_health_sessiond); |
917a718d JG |
2718 | |
2719 | DBG("Client thread dying"); | |
3a91de3a | 2720 | lttng_payload_reset(&cmd_ctx.reply_payload); |
917a718d | 2721 | rcu_unregister_thread(); |
cd9adb8b | 2722 | return nullptr; |
917a718d JG |
2723 | } |
2724 | ||
28ab034a | 2725 | static bool shutdown_client_thread(void *thread_data) |
917a718d | 2726 | { |
7966af57 | 2727 | struct lttng_pipe *client_quit_pipe = (lttng_pipe *) thread_data; |
917a718d JG |
2728 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); |
2729 | ||
2730 | return notify_thread_pipe(write_fd) == 1; | |
2731 | } | |
2732 | ||
cd9adb8b | 2733 | struct lttng_thread *launch_client_thread() |
917a718d | 2734 | { |
6cb45e93 | 2735 | bool thread_running; |
917a718d | 2736 | struct lttng_pipe *client_quit_pipe; |
cd9adb8b | 2737 | struct lttng_thread *thread = nullptr; |
0f68efb6 | 2738 | int client_sock_fd = -1; |
917a718d | 2739 | |
6cb45e93 | 2740 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2741 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2742 | if (!client_quit_pipe) { | |
2743 | goto error; | |
2744 | } | |
2745 | ||
0f68efb6 JG |
2746 | client_sock_fd = create_client_sock(); |
2747 | if (client_sock_fd < 0) { | |
2748 | goto error; | |
2749 | } | |
2750 | ||
2751 | thread_state.client_sock = client_sock_fd; | |
917a718d | 2752 | thread = lttng_thread_create("Client management", |
28ab034a JG |
2753 | thread_manage_clients, |
2754 | shutdown_client_thread, | |
2755 | cleanup_client_thread, | |
2756 | client_quit_pipe); | |
917a718d JG |
2757 | if (!thread) { |
2758 | goto error; | |
2759 | } | |
0f68efb6 JG |
2760 | /* The client thread now owns the client sock fd and the quit pipe. */ |
2761 | client_sock_fd = -1; | |
cd9adb8b | 2762 | client_quit_pipe = nullptr; |
917a718d JG |
2763 | |
2764 | /* | |
2765 | * This thread is part of the threads that need to be fully | |
2766 | * initialized before the session daemon is marked as "ready". | |
2767 | */ | |
6cb45e93 JG |
2768 | thread_running = wait_thread_status(); |
2769 | if (!thread_running) { | |
0f68efb6 | 2770 | goto error; |
6cb45e93 | 2771 | } |
917a718d JG |
2772 | return thread; |
2773 | error: | |
0f68efb6 JG |
2774 | if (client_sock_fd >= 0) { |
2775 | if (close(client_sock_fd)) { | |
2776 | PERROR("Failed to close client socket"); | |
2777 | } | |
2778 | } | |
2779 | lttng_thread_put(thread); | |
917a718d | 2780 | cleanup_client_thread(client_quit_pipe); |
cd9adb8b | 2781 | return nullptr; |
917a718d | 2782 | } |