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