Remove ht-cleanup thread
[lttng-tools.git] / src / bin / lttng-sessiond / client.cpp
CommitLineData
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
159b042f 10#include "common/buffer-view.h"
3a91de3a 11#include "common/compat/socket.h"
3a91de3a 12#include "common/dynamic-array.h"
588c4b0d 13#include "common/dynamic-buffer.h"
fe489250 14#include "common/fd-handle.h"
e368fb43 15#include "common/payload-view.h"
588c4b0d
JG
16#include "common/payload.h"
17#include "common/sessiond-comm/sessiond-comm.h"
159b042f
JG
18#include "lttng/lttng-error.h"
19#include "lttng/tracker.h"
917a718d 20#include <common/compat/getenv.h>
159b042f 21#include <common/tracker.h>
917a718d
JG
22#include <common/unix.h>
23#include <common/utils.h>
588c4b0d 24#include <lttng/error-query-internal.h>
917a718d 25#include <lttng/event-internal.h>
b178f53e 26#include <lttng/session-descriptor-internal.h>
159b042f
JG
27#include <lttng/session-internal.h>
28#include <lttng/userspace-probe-internal.h>
29#include <pthread.h>
30#include <signal.h>
31#include <stddef.h>
32#include <sys/stat.h>
1434fd36 33#include <unistd.h>
917a718d 34
588c4b0d
JG
35#include "agent-thread.h"
36#include "clear.h"
917a718d 37#include "client.h"
917a718d 38#include "cmd.h"
588c4b0d 39#include "health-sessiond.h"
917a718d 40#include "kernel.h"
588c4b0d
JG
41#include "lttng-sessiond.h"
42#include "manage-consumer.h"
917a718d 43#include "save.h"
917a718d
JG
44#include "testpoint.h"
45#include "utils.h"
46
47static bool is_root;
48
49static struct thread_state {
6cb45e93
JG
50 sem_t ready;
51 bool running;
0f68efb6 52 int client_sock;
6cb45e93
JG
53} thread_state;
54
55static void set_thread_status(bool running)
917a718d 56{
6cb45e93
JG
57 DBG("Marking client thread's state as %s", running ? "running" : "error");
58 thread_state.running = running;
59 sem_post(&thread_state.ready);
917a718d
JG
60}
61
6cb45e93 62static bool wait_thread_status(void)
917a718d 63{
6cb45e93
JG
64 DBG("Waiting for client thread to be ready");
65 sem_wait(&thread_state.ready);
66 if (thread_state.running) {
67 DBG("Client thread is ready");
68 } else {
69 ERR("Initialization of client thread failed");
917a718d 70 }
6cb45e93
JG
71
72 return thread_state.running;
917a718d
JG
73}
74
75/*
76 * Setup the outgoing data buffer for the response (llm) by allocating the
77 * right amount of memory and copying the original information from the lsm
78 * structure.
79 *
80 * Return 0 on success, negative value on error.
81 */
82static int setup_lttng_msg(struct command_ctx *cmd_ctx,
83 const void *payload_buf, size_t payload_len,
84 const void *cmd_header_buf, size_t cmd_header_len)
85{
86 int ret = 0;
87 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
917a718d 88 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
7966af57
SM
89 lttcomm_lttng_msg llm {};
90
91 llm.cmd_type = cmd_ctx->lsm.cmd_type;
92 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
93 llm.cmd_header_size = (uint32_t) cmd_header_len;
94 llm.data_size = (uint32_t) payload_len;
917a718d 95
2eb1b01f
JR
96 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
97 if (ret) {
98 goto end;
99 }
100
fe489250 101 lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles);
917a718d 102
3a91de3a
JG
103 cmd_ctx->lttng_msg_size = total_msg_size;
104
105 /* Append reply header. */
106 ret = lttng_dynamic_buffer_append(
107 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
108 if (ret) {
917a718d
JG
109 goto end;
110 }
111
3a91de3a 112 /* Append command header. */
917a718d 113 if (cmd_header_len) {
3a91de3a
JG
114 ret = lttng_dynamic_buffer_append(
115 &cmd_ctx->reply_payload.buffer, cmd_header_buf,
116 cmd_header_len);
117 if (ret) {
118 goto end;
119 }
917a718d
JG
120 }
121
3a91de3a 122 /* Append payload. */
917a718d 123 if (payload_len) {
3a91de3a
JG
124 ret = lttng_dynamic_buffer_append(
125 &cmd_ctx->reply_payload.buffer, payload_buf,
126 payload_len);
127 if (ret) {
128 goto end;
129 }
917a718d
JG
130 }
131
132end:
133 return ret;
134}
135
e368fb43
JG
136static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx)
137{
138 int ret;
139 const struct lttcomm_lttng_msg llm = {};
140
64defc29
JR
141 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
142 if (ret) {
143 goto end;
144 }
e368fb43
JG
145
146 /* Append place-holder reply header. */
147 ret = lttng_dynamic_buffer_append(
148 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
149 if (ret) {
150 goto end;
151 }
152
153 cmd_ctx->lttng_msg_size = sizeof(llm);
154end:
155 return ret;
156}
157
158static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len,
159 size_t payload_len)
160{
161 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
162 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
e368fb43 163 struct lttcomm_lttng_msg *p_llm;
7966af57
SM
164 lttcomm_lttng_msg llm {};
165
166 llm.cmd_type = cmd_ctx->lsm.cmd_type;
167 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
168 llm.cmd_header_size = (uint32_t) cmd_header_len;
169 llm.data_size = (uint32_t) payload_len;
e368fb43 170
a0377dfe 171 LTTNG_ASSERT(cmd_ctx->reply_payload.buffer.size >= sizeof(llm));
e368fb43
JG
172
173 p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data;
174
175 /* Update existing header. */
176 memcpy(p_llm, &llm, sizeof(llm));
177
178 cmd_ctx->lttng_msg_size = total_msg_size;
179}
180
917a718d
JG
181/*
182 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
4ec029ed 183 * exec or it will fail.
917a718d
JG
184 */
185static int spawn_consumer_thread(struct consumer_data *consumer_data)
186{
4ec029ed 187 return launch_consumer_management_thread(consumer_data) ? 0 : -1;
917a718d
JG
188}
189
190/*
191 * Fork and exec a consumer daemon (consumerd).
192 *
193 * Return pid if successful else -1.
194 */
195static pid_t spawn_consumerd(struct consumer_data *consumer_data)
196{
197 int ret;
198 pid_t pid;
199 const char *consumer_to_use;
200 const char *verbosity;
201 struct stat st;
202
203 DBG("Spawning consumerd");
204
205 pid = fork();
206 if (pid == 0) {
207 /*
208 * Exec consumerd.
209 */
412d7227 210 if (the_config.verbose_consumer) {
917a718d
JG
211 verbosity = "--verbose";
212 } else if (lttng_opt_quiet) {
213 verbosity = "--quiet";
214 } else {
215 verbosity = "";
216 }
217
218 switch (consumer_data->type) {
219 case LTTNG_CONSUMER_KERNEL:
220 /*
221 * Find out which consumerd to execute. We will first try the
222 * 64-bit path, then the sessiond's installation directory, and
223 * fallback on the 32-bit one,
224 */
225 DBG3("Looking for a kernel consumer at these locations:");
412d7227 226 DBG3(" 1) %s", the_config.consumerd64_bin_path.value ? : "NULL");
917a718d 227 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE);
412d7227
SM
228 DBG3(" 3) %s", the_config.consumerd32_bin_path.value ? : "NULL");
229 if (stat(the_config.consumerd64_bin_path.value, &st) == 0) {
917a718d 230 DBG3("Found location #1");
412d7227 231 consumer_to_use = the_config.consumerd64_bin_path.value;
917a718d
JG
232 } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) {
233 DBG3("Found location #2");
234 consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE;
412d7227
SM
235 } else if (the_config.consumerd32_bin_path.value &&
236 stat(the_config.consumerd32_bin_path.value, &st) == 0) {
917a718d 237 DBG3("Found location #3");
412d7227 238 consumer_to_use = the_config.consumerd32_bin_path.value;
917a718d
JG
239 } else {
240 DBG("Could not find any valid consumerd executable");
241 ret = -EINVAL;
242 goto error;
243 }
244 DBG("Using kernel consumer at: %s", consumer_to_use);
412d7227
SM
245 (void) execl(consumer_to_use, "lttng-consumerd",
246 verbosity, "-k", "--consumerd-cmd-sock",
247 consumer_data->cmd_unix_sock_path,
248 "--consumerd-err-sock",
249 consumer_data->err_unix_sock_path,
250 "--group",
251 the_config.tracing_group_name.value,
252 NULL);
917a718d
JG
253 break;
254 case LTTNG_CONSUMER64_UST:
255 {
412d7227 256 if (the_config.consumerd64_lib_dir.value) {
b53d4e59 257 const char *tmp;
917a718d
JG
258 size_t tmplen;
259 char *tmpnew;
260
261 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
262 if (!tmp) {
263 tmp = "";
264 }
412d7227 265 tmplen = strlen(the_config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp);
7966af57 266 tmpnew = (char *) zmalloc(tmplen + 1 /* \0 */);
917a718d
JG
267 if (!tmpnew) {
268 ret = -ENOMEM;
269 goto error;
270 }
412d7227 271 strcat(tmpnew, the_config.consumerd64_lib_dir.value);
917a718d
JG
272 if (tmp[0] != '\0') {
273 strcat(tmpnew, ":");
274 strcat(tmpnew, tmp);
275 }
276 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
277 free(tmpnew);
278 if (ret) {
279 ret = -errno;
280 goto error;
281 }
282 }
412d7227
SM
283 DBG("Using 64-bit UST consumer at: %s",
284 the_config.consumerd64_bin_path.value);
285 (void) execl(the_config.consumerd64_bin_path.value,
286 "lttng-consumerd", verbosity, "-u",
287 "--consumerd-cmd-sock",
288 consumer_data->cmd_unix_sock_path,
289 "--consumerd-err-sock",
290 consumer_data->err_unix_sock_path,
291 "--group",
292 the_config.tracing_group_name.value,
917a718d
JG
293 NULL);
294 break;
295 }
296 case LTTNG_CONSUMER32_UST:
297 {
412d7227 298 if (the_config.consumerd32_lib_dir.value) {
b53d4e59 299 const char *tmp;
917a718d
JG
300 size_t tmplen;
301 char *tmpnew;
302
303 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
304 if (!tmp) {
305 tmp = "";
306 }
412d7227 307 tmplen = strlen(the_config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp);
7966af57 308 tmpnew = (char *) zmalloc(tmplen + 1 /* \0 */);
917a718d
JG
309 if (!tmpnew) {
310 ret = -ENOMEM;
311 goto error;
312 }
412d7227 313 strcat(tmpnew, the_config.consumerd32_lib_dir.value);
917a718d
JG
314 if (tmp[0] != '\0') {
315 strcat(tmpnew, ":");
316 strcat(tmpnew, tmp);
317 }
318 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
319 free(tmpnew);
320 if (ret) {
321 ret = -errno;
322 goto error;
323 }
324 }
412d7227
SM
325 DBG("Using 32-bit UST consumer at: %s",
326 the_config.consumerd32_bin_path.value);
327 (void) execl(the_config.consumerd32_bin_path.value,
328 "lttng-consumerd", verbosity, "-u",
329 "--consumerd-cmd-sock",
330 consumer_data->cmd_unix_sock_path,
331 "--consumerd-err-sock",
332 consumer_data->err_unix_sock_path,
333 "--group",
334 the_config.tracing_group_name.value,
917a718d
JG
335 NULL);
336 break;
337 }
338 default:
339 ERR("unknown consumer type");
340 errno = 0;
341 }
342 if (errno != 0) {
343 PERROR("Consumer execl()");
344 }
345 /* Reaching this point, we got a failure on our execl(). */
346 exit(EXIT_FAILURE);
347 } else if (pid > 0) {
348 ret = pid;
349 } else {
350 PERROR("start consumer fork");
351 ret = -errno;
352 }
353error:
354 return ret;
355}
356
357/*
358 * Spawn the consumerd daemon and session daemon thread.
359 */
360static int start_consumerd(struct consumer_data *consumer_data)
361{
362 int ret;
363
364 /*
365 * Set the listen() state on the socket since there is a possible race
366 * between the exec() of the consumer daemon and this call if place in the
367 * consumer thread. See bug #366 for more details.
368 */
369 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
370 if (ret < 0) {
371 goto error;
372 }
373
374 pthread_mutex_lock(&consumer_data->pid_mutex);
375 if (consumer_data->pid != 0) {
376 pthread_mutex_unlock(&consumer_data->pid_mutex);
377 goto end;
378 }
379
380 ret = spawn_consumerd(consumer_data);
381 if (ret < 0) {
382 ERR("Spawning consumerd failed");
383 pthread_mutex_unlock(&consumer_data->pid_mutex);
384 goto error;
385 }
386
387 /* Setting up the consumer_data pid */
388 consumer_data->pid = ret;
389 DBG2("Consumer pid %d", consumer_data->pid);
390 pthread_mutex_unlock(&consumer_data->pid_mutex);
391
392 DBG2("Spawning consumer control thread");
393 ret = spawn_consumer_thread(consumer_data);
394 if (ret < 0) {
395 ERR("Fatal error spawning consumer control thread");
396 goto error;
397 }
398
399end:
400 return 0;
401
402error:
403 /* Cleanup already created sockets on error. */
404 if (consumer_data->err_sock >= 0) {
405 int err;
406
407 err = close(consumer_data->err_sock);
408 if (err < 0) {
409 PERROR("close consumer data error socket");
410 }
411 }
412 return ret;
413}
414
415/*
416 * Copy consumer output from the tracing session to the domain session. The
417 * function also applies the right modification on a per domain basis for the
418 * trace files destination directory.
917a718d
JG
419 */
420static int copy_session_consumer(int domain, struct ltt_session *session)
421{
422 int ret;
423 const char *dir_name;
424 struct consumer_output *consumer;
425
a0377dfe
FD
426 LTTNG_ASSERT(session);
427 LTTNG_ASSERT(session->consumer);
917a718d
JG
428
429 switch (domain) {
430 case LTTNG_DOMAIN_KERNEL:
431 DBG3("Copying tracing session consumer output in kernel session");
432 /*
433 * XXX: We should audit the session creation and what this function
434 * does "extra" in order to avoid a destroy since this function is used
435 * in the domain session creation (kernel and ust) only. Same for UST
436 * domain.
437 */
438 if (session->kernel_session->consumer) {
439 consumer_output_put(session->kernel_session->consumer);
440 }
441 session->kernel_session->consumer =
442 consumer_copy_output(session->consumer);
443 /* Ease our life a bit for the next part */
444 consumer = session->kernel_session->consumer;
445 dir_name = DEFAULT_KERNEL_TRACE_DIR;
446 break;
447 case LTTNG_DOMAIN_JUL:
448 case LTTNG_DOMAIN_LOG4J:
449 case LTTNG_DOMAIN_PYTHON:
450 case LTTNG_DOMAIN_UST:
451 DBG3("Copying tracing session consumer output in UST session");
452 if (session->ust_session->consumer) {
453 consumer_output_put(session->ust_session->consumer);
454 }
455 session->ust_session->consumer =
456 consumer_copy_output(session->consumer);
457 /* Ease our life a bit for the next part */
458 consumer = session->ust_session->consumer;
459 dir_name = DEFAULT_UST_TRACE_DIR;
460 break;
461 default:
462 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
463 goto error;
464 }
465
466 /* Append correct directory to subdir */
b178f53e
JG
467 ret = lttng_strncpy(consumer->domain_subdir, dir_name,
468 sizeof(consumer->domain_subdir));
469 if (ret) {
470 ret = LTTNG_ERR_UNK;
471 goto error;
472 }
473 DBG3("Copy session consumer subdir %s", consumer->domain_subdir);
917a718d
JG
474 ret = LTTNG_OK;
475
476error:
477 return ret;
478}
479
480/*
481 * Create an UST session and add it to the session ust list.
917a718d
JG
482 */
483static int create_ust_session(struct ltt_session *session,
df4f5a87 484 const struct lttng_domain *domain)
917a718d
JG
485{
486 int ret;
487 struct ltt_ust_session *lus = NULL;
488
a0377dfe
FD
489 LTTNG_ASSERT(session);
490 LTTNG_ASSERT(domain);
491 LTTNG_ASSERT(session->consumer);
917a718d
JG
492
493 switch (domain->type) {
494 case LTTNG_DOMAIN_JUL:
495 case LTTNG_DOMAIN_LOG4J:
496 case LTTNG_DOMAIN_PYTHON:
497 case LTTNG_DOMAIN_UST:
498 break;
499 default:
500 ERR("Unknown UST domain on create session %d", domain->type);
501 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
502 goto error;
503 }
504
505 DBG("Creating UST session");
506
507 lus = trace_ust_create_session(session->id);
508 if (lus == NULL) {
509 ret = LTTNG_ERR_UST_SESS_FAIL;
510 goto error;
511 }
512
513 lus->uid = session->uid;
514 lus->gid = session->gid;
515 lus->output_traces = session->output_traces;
516 lus->snapshot_mode = session->snapshot_mode;
517 lus->live_timer_interval = session->live_timer;
518 session->ust_session = lus;
519 if (session->shm_path[0]) {
520 strncpy(lus->root_shm_path, session->shm_path,
521 sizeof(lus->root_shm_path));
522 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
523 strncpy(lus->shm_path, session->shm_path,
524 sizeof(lus->shm_path));
525 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
526 strncat(lus->shm_path, "/ust",
527 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
528 }
529 /* Copy session output to the newly created UST session */
530 ret = copy_session_consumer(domain->type, session);
531 if (ret != LTTNG_OK) {
532 goto error;
533 }
534
535 return LTTNG_OK;
536
537error:
538 free(lus);
539 session->ust_session = NULL;
540 return ret;
541}
542
543/*
544 * Create a kernel tracer session then create the default channel.
545 */
546static int create_kernel_session(struct ltt_session *session)
547{
548 int ret;
549
550 DBG("Creating kernel session");
551
7d268848 552 ret = kernel_create_session(session);
917a718d
JG
553 if (ret < 0) {
554 ret = LTTNG_ERR_KERN_SESS_FAIL;
5d0a7bcb 555 goto error_create;
917a718d
JG
556 }
557
558 /* Code flow safety */
a0377dfe 559 LTTNG_ASSERT(session->kernel_session);
917a718d
JG
560
561 /* Copy session output to the newly created Kernel session */
562 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
563 if (ret != LTTNG_OK) {
564 goto error;
565 }
566
567 session->kernel_session->uid = session->uid;
568 session->kernel_session->gid = session->gid;
569 session->kernel_session->output_traces = session->output_traces;
570 session->kernel_session->snapshot_mode = session->snapshot_mode;
a2814ea7 571 session->kernel_session->is_live_session = session->live_timer != 0;
917a718d
JG
572
573 return LTTNG_OK;
574
575error:
576 trace_kernel_destroy_session(session->kernel_session);
577 session->kernel_session = NULL;
5d0a7bcb 578error_create:
917a718d
JG
579 return ret;
580}
581
582/*
583 * Count number of session permitted by uid/gid.
584 */
585static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
586{
587 unsigned int i = 0;
588 struct ltt_session *session;
589 const struct ltt_session_list *session_list = session_get_list();
590
d7b377ed 591 DBG("Counting number of available session for UID %d", uid);
917a718d
JG
592 cds_list_for_each_entry(session, &session_list->head, list) {
593 if (!session_get(session)) {
594 continue;
595 }
596 session_lock(session);
597 /* Only count the sessions the user can control. */
d7b377ed 598 if (session_access_ok(session, uid) &&
917a718d
JG
599 !session->destroyed) {
600 i++;
601 }
602 session_unlock(session);
603 session_put(session);
604 }
605 return i;
606}
607
608static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock,
609 int *sock_error, struct lttng_event *event)
610{
fe489250 611 int fd = -1, ret;
917a718d 612 struct lttng_userspace_probe_location *probe_location;
e368fb43 613 struct lttng_payload probe_location_payload;
fe489250 614 struct fd_handle *handle = NULL;
917a718d
JG
615
616 /*
e368fb43 617 * Create a payload to store the serialized version of the probe
917a718d
JG
618 * location.
619 */
e368fb43
JG
620 lttng_payload_init(&probe_location_payload);
621
622 ret = lttng_dynamic_buffer_set_size(&probe_location_payload.buffer,
3a91de3a 623 cmd_ctx->lsm.u.enable.userspace_probe_location_len);
917a718d
JG
624 if (ret) {
625 ret = LTTNG_ERR_NOMEM;
626 goto error;
627 }
628
629 /*
630 * Receive the probe location.
631 */
e368fb43
JG
632 ret = lttcomm_recv_unix_sock(sock, probe_location_payload.buffer.data,
633 probe_location_payload.buffer.size);
917a718d
JG
634 if (ret <= 0) {
635 DBG("Nothing recv() from client var len data... continuing");
636 *sock_error = 1;
917a718d
JG
637 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
638 goto error;
639 }
640
641 /*
642 * Receive the file descriptor to the target binary from the client.
643 */
644 DBG("Receiving userspace probe target FD from client ...");
645 ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
646 if (ret <= 0) {
647 DBG("Nothing recv() from client userspace probe fd... continuing");
648 *sock_error = 1;
649 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
650 goto error;
651 }
652
fe489250
JG
653 handle = fd_handle_create(fd);
654 if (!handle) {
655 ret = LTTNG_ERR_NOMEM;
656 goto error;
657 }
658
659 /* Transferred to the handle. */
660 fd = -1;
661
662 ret = lttng_payload_push_fd_handle(&probe_location_payload, handle);
e368fb43
JG
663 if (ret) {
664 ERR("Failed to add userspace probe file descriptor to payload");
665 ret = LTTNG_ERR_NOMEM;
917a718d
JG
666 goto error;
667 }
668
fe489250
JG
669 fd_handle_put(handle);
670 handle = NULL;
671
e368fb43
JG
672 {
673 struct lttng_payload_view view = lttng_payload_view_from_payload(
674 &probe_location_payload, 0, -1);
917a718d 675
e368fb43
JG
676 /* Extract the probe location from the serialized version. */
677 ret = lttng_userspace_probe_location_create_from_payload(
678 &view, &probe_location);
679 }
680 if (ret < 0) {
681 WARN("Failed to create a userspace probe location from the received buffer");
917a718d
JG
682 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
683 goto error;
684 }
685
686 /* Attach the probe location to the event. */
687 ret = lttng_event_set_userspace_probe_location(event, probe_location);
688 if (ret) {
689 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
690 goto error;
691 }
692
917a718d 693error:
fe489250
JG
694 if (fd >= 0) {
695 if (close(fd)) {
696 PERROR("Failed to close userspace probe location binary fd");
697 }
698 }
699
700 fd_handle_put(handle);
e368fb43 701 lttng_payload_reset(&probe_location_payload);
917a718d
JG
702 return ret;
703}
704
746e08d7
JG
705static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx,
706 int sock,
707 int *sock_error,
708 struct lttng_trigger **_trigger)
709{
710 int ret;
711 size_t trigger_len;
712 ssize_t sock_recv_len;
713 enum lttng_error_code ret_code;
714 struct lttng_payload trigger_payload;
b5ef1685 715 struct lttng_trigger *trigger = NULL;
746e08d7
JG
716
717 lttng_payload_init(&trigger_payload);
718 trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
719 ret = lttng_dynamic_buffer_set_size(
720 &trigger_payload.buffer, trigger_len);
721 if (ret) {
722 ret_code = LTTNG_ERR_NOMEM;
723 goto end;
724 }
725
726 sock_recv_len = lttcomm_recv_unix_sock(
727 sock, trigger_payload.buffer.data, trigger_len);
728 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
729 ERR("Failed to receive trigger in command payload");
730 *sock_error = 1;
731 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
732 goto end;
733 }
734
735 /* Receive fds, if any. */
736 if (cmd_ctx->lsm.fd_count > 0) {
737 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
738 sock, cmd_ctx->lsm.fd_count, &trigger_payload);
739 if (sock_recv_len > 0 &&
740 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
741 ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
742 cmd_ctx->lsm.fd_count, (int) ret);
743 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
744 *sock_error = 1;
745 goto end;
746 } else if (sock_recv_len <= 0) {
747 ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
748 cmd_ctx->lsm.fd_count, (int) ret);
749 ret_code = LTTNG_ERR_FATAL;
750 *sock_error = 1;
751 goto end;
752 }
753 }
754
755 /* Deserialize trigger. */
756 {
757 struct lttng_payload_view view =
758 lttng_payload_view_from_payload(
759 &trigger_payload, 0, -1);
760
761 if (lttng_trigger_create_from_payload(&view, &trigger) !=
762 trigger_len) {
763 ERR("Invalid trigger received as part of command payload");
764 ret_code = LTTNG_ERR_INVALID_TRIGGER;
b5ef1685 765 lttng_trigger_put(trigger);
746e08d7
JG
766 goto end;
767 }
768 }
769
770 *_trigger = trigger;
771 ret_code = LTTNG_OK;
772
773end:
bae46a81 774 lttng_payload_reset(&trigger_payload);
746e08d7
JG
775 return ret_code;
776}
777
588c4b0d
JG
778static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx,
779 int sock,
780 int *sock_error,
781 struct lttng_error_query **_query)
782{
783 int ret;
784 size_t query_len;
785 ssize_t sock_recv_len;
786 enum lttng_error_code ret_code;
787 struct lttng_payload query_payload;
788 struct lttng_error_query *query = NULL;
789
790 lttng_payload_init(&query_payload);
791 query_len = (size_t) cmd_ctx->lsm.u.error_query.length;
792 ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len);
793 if (ret) {
794 ret_code = LTTNG_ERR_NOMEM;
795 goto end;
796 }
797
798 sock_recv_len = lttcomm_recv_unix_sock(
799 sock, query_payload.buffer.data, query_len);
800 if (sock_recv_len < 0 || sock_recv_len != query_len) {
801 ERR("Failed to receive error query in command payload");
802 *sock_error = 1;
803 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
804 goto end;
805 }
806
807 /* Receive fds, if any. */
808 if (cmd_ctx->lsm.fd_count > 0) {
809 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
810 sock, cmd_ctx->lsm.fd_count, &query_payload);
811 if (sock_recv_len > 0 &&
812 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
813 ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d",
814 cmd_ctx->lsm.fd_count, (int) ret);
815 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
816 *sock_error = 1;
817 goto end;
818 } else if (sock_recv_len <= 0) {
819 ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d",
820 cmd_ctx->lsm.fd_count, (int) ret);
821 ret_code = LTTNG_ERR_FATAL;
822 *sock_error = 1;
823 goto end;
824 }
825 }
826
827 /* Deserialize error query. */
828 {
829 struct lttng_payload_view view =
830 lttng_payload_view_from_payload(
831 &query_payload, 0, -1);
832
833 if (lttng_error_query_create_from_payload(&view, &query) !=
834 query_len) {
835 ERR("Invalid error query received as part of command payload");
836 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
837 goto end;
838 }
839 }
840
841 *_query = query;
842 ret_code = LTTNG_OK;
843
844end:
845 lttng_payload_reset(&query_payload);
846 return ret_code;
847}
848
917a718d
JG
849/*
850 * Version of setup_lttng_msg() without command header.
851 */
852static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
853 void *payload_buf, size_t payload_len)
854{
855 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
856}
857
917a718d
JG
858/*
859 * Check if the current kernel tracer supports the session rotation feature.
860 * Return 1 if it does, 0 otherwise.
861 */
862static int check_rotate_compatible(void)
863{
864 int ret = 1;
865
412d7227
SM
866 if (the_kernel_tracer_version.major != 2 ||
867 the_kernel_tracer_version.minor < 11) {
917a718d
JG
868 DBG("Kernel tracer version is not compatible with the rotation feature");
869 ret = 0;
870 }
871
872 return ret;
873}
874
875/*
876 * Send data on a unix socket using the liblttsessiondcomm API.
877 *
878 * Return lttcomm error code.
879 */
3a91de3a 880static int send_unix_sock(int sock, struct lttng_payload_view *view)
917a718d 881{
3a91de3a 882 int ret;
fe489250 883 const int fd_count = lttng_payload_view_get_fd_handle_count(view);
3a91de3a 884
917a718d 885 /* Check valid length */
3a91de3a
JG
886 if (view->buffer.size == 0) {
887 ret = -1;
888 goto end;
889 }
890
891 ret = lttcomm_send_unix_sock(
892 sock, view->buffer.data, view->buffer.size);
893 if (ret < 0) {
894 goto end;
917a718d
JG
895 }
896
fe489250 897 if (fd_count > 0) {
700741dc
JG
898 ret = lttcomm_send_payload_view_fds_unix_sock(sock, view);
899 if (ret < 0) {
900 goto end;
fe489250 901 }
3a91de3a
JG
902 }
903
904end:
905 return ret;
917a718d
JG
906}
907
908/*
909 * Process the command requested by the lttng client within the command
910 * context structure. This function make sure that the return structure (llm)
911 * is set and ready for transmission before returning.
912 *
913 * Return any error encountered or 0 for success.
914 *
915 * "sock" is only used for special-case var. len data.
3e3665b8
JG
916 * A command may assume the ownership of the socket, in which case its value
917 * should be set to -1.
917a718d 918 */
3e3665b8 919static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
917a718d
JG
920 int *sock_error)
921{
922 int ret = LTTNG_OK;
9124c630
JR
923 bool need_tracing_session = true;
924 bool need_domain;
925 bool need_consumerd;
917a718d 926
19f912db 927 DBG("Processing client command '%s\' (%d)",
7966af57 928 lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx->lsm.cmd_type),
19f912db 929 cmd_ctx->lsm.cmd_type);
917a718d 930
a0377dfe 931 LTTNG_ASSERT(!rcu_read_ongoing());
917a718d
JG
932
933 *sock_error = 0;
934
3a91de3a 935 switch (cmd_ctx->lsm.cmd_type) {
b178f53e 936 case LTTNG_CREATE_SESSION_EXT:
917a718d
JG
937 case LTTNG_DESTROY_SESSION:
938 case LTTNG_LIST_SESSIONS:
939 case LTTNG_LIST_DOMAINS:
940 case LTTNG_START_TRACE:
941 case LTTNG_STOP_TRACE:
942 case LTTNG_DATA_PENDING:
943 case LTTNG_SNAPSHOT_ADD_OUTPUT:
944 case LTTNG_SNAPSHOT_DEL_OUTPUT:
945 case LTTNG_SNAPSHOT_LIST_OUTPUT:
946 case LTTNG_SNAPSHOT_RECORD:
947 case LTTNG_SAVE_SESSION:
948 case LTTNG_SET_SESSION_SHM_PATH:
949 case LTTNG_REGENERATE_METADATA:
950 case LTTNG_REGENERATE_STATEDUMP:
917a718d
JG
951 case LTTNG_ROTATE_SESSION:
952 case LTTNG_ROTATION_GET_INFO:
953 case LTTNG_ROTATION_SET_SCHEDULE:
954 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
022349df 955 case LTTNG_CLEAR_SESSION:
fbc9f37d 956 case LTTNG_LIST_TRIGGERS:
588c4b0d 957 case LTTNG_EXECUTE_ERROR_QUERY:
9124c630
JR
958 need_domain = false;
959 break;
960 default:
961 need_domain = true;
962 }
963
964 /* Needs a functioning consumerd? */
965 switch (cmd_ctx->lsm.cmd_type) {
966 case LTTNG_REGISTER_TRIGGER:
967 case LTTNG_UNREGISTER_TRIGGER:
588c4b0d 968 case LTTNG_EXECUTE_ERROR_QUERY:
9124c630 969 need_consumerd = false;
917a718d
JG
970 break;
971 default:
9124c630
JR
972 need_consumerd = true;
973 break;
917a718d
JG
974 }
975
412d7227
SM
976 if (the_config.no_kernel && need_domain &&
977 cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) {
917a718d
JG
978 if (!is_root) {
979 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
980 } else {
981 ret = LTTNG_ERR_KERN_NA;
982 }
983 goto error;
984 }
985
986 /* Deny register consumer if we already have a spawned consumer. */
3a91de3a 987 if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) {
412d7227
SM
988 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
989 if (the_kconsumer_data.pid > 0) {
917a718d 990 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
412d7227 991 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
917a718d
JG
992 goto error;
993 }
412d7227 994 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
917a718d
JG
995 }
996
997 /*
998 * Check for command that don't needs to allocate a returned payload. We do
999 * this here so we don't have to make the call for no payload at each
1000 * command.
1001 */
3a91de3a 1002 switch(cmd_ctx->lsm.cmd_type) {
917a718d
JG
1003 case LTTNG_LIST_SESSIONS:
1004 case LTTNG_LIST_TRACEPOINTS:
1005 case LTTNG_LIST_TRACEPOINT_FIELDS:
1006 case LTTNG_LIST_DOMAINS:
1007 case LTTNG_LIST_CHANNELS:
1008 case LTTNG_LIST_EVENTS:
1009 case LTTNG_LIST_SYSCALLS:
159b042f
JG
1010 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1011 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1012 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
917a718d
JG
1013 case LTTNG_DATA_PENDING:
1014 case LTTNG_ROTATE_SESSION:
1015 case LTTNG_ROTATION_GET_INFO:
9124c630 1016 case LTTNG_REGISTER_TRIGGER:
fbc9f37d 1017 case LTTNG_LIST_TRIGGERS:
588c4b0d 1018 case LTTNG_EXECUTE_ERROR_QUERY:
917a718d
JG
1019 break;
1020 default:
1021 /* Setup lttng message with no payload */
1022 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
1023 if (ret < 0) {
1024 /* This label does not try to unlock the session */
1025 goto init_setup_error;
1026 }
1027 }
1028
1029 /* Commands that DO NOT need a session. */
3a91de3a 1030 switch (cmd_ctx->lsm.cmd_type) {
b178f53e 1031 case LTTNG_CREATE_SESSION_EXT:
917a718d
JG
1032 case LTTNG_LIST_SESSIONS:
1033 case LTTNG_LIST_TRACEPOINTS:
1034 case LTTNG_LIST_SYSCALLS:
1035 case LTTNG_LIST_TRACEPOINT_FIELDS:
1036 case LTTNG_SAVE_SESSION:
1037 case LTTNG_REGISTER_TRIGGER:
1038 case LTTNG_UNREGISTER_TRIGGER:
fbc9f37d 1039 case LTTNG_LIST_TRIGGERS:
588c4b0d 1040 case LTTNG_EXECUTE_ERROR_QUERY:
9124c630 1041 need_tracing_session = false;
917a718d
JG
1042 break;
1043 default:
3a91de3a 1044 DBG("Getting session %s by name", cmd_ctx->lsm.session.name);
917a718d
JG
1045 /*
1046 * We keep the session list lock across _all_ commands
1047 * for now, because the per-session lock does not
1048 * handle teardown properly.
1049 */
1050 session_lock_list();
3a91de3a 1051 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name);
917a718d
JG
1052 if (cmd_ctx->session == NULL) {
1053 ret = LTTNG_ERR_SESS_NOT_FOUND;
1054 goto error;
1055 } else {
1056 /* Acquire lock for the session */
1057 session_lock(cmd_ctx->session);
1058 }
1059 break;
1060 }
1061
1062 /*
1063 * Commands that need a valid session but should NOT create one if none
1064 * exists. Instead of creating one and destroying it when the command is
1065 * handled, process that right before so we save some round trip in useless
1066 * code path.
1067 */
3a91de3a 1068 switch (cmd_ctx->lsm.cmd_type) {
917a718d
JG
1069 case LTTNG_DISABLE_CHANNEL:
1070 case LTTNG_DISABLE_EVENT:
3a91de3a 1071 switch (cmd_ctx->lsm.domain.type) {
917a718d
JG
1072 case LTTNG_DOMAIN_KERNEL:
1073 if (!cmd_ctx->session->kernel_session) {
1074 ret = LTTNG_ERR_NO_CHANNEL;
1075 goto error;
1076 }
1077 break;
1078 case LTTNG_DOMAIN_JUL:
1079 case LTTNG_DOMAIN_LOG4J:
1080 case LTTNG_DOMAIN_PYTHON:
1081 case LTTNG_DOMAIN_UST:
1082 if (!cmd_ctx->session->ust_session) {
1083 ret = LTTNG_ERR_NO_CHANNEL;
1084 goto error;
1085 }
1086 break;
1087 default:
1088 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1089 goto error;
1090 }
1091 default:
1092 break;
1093 }
1094
1095 if (!need_domain) {
1096 goto skip_domain;
1097 }
1098
1099 /*
1100 * Check domain type for specific "pre-action".
1101 */
3a91de3a 1102 switch (cmd_ctx->lsm.domain.type) {
917a718d
JG
1103 case LTTNG_DOMAIN_KERNEL:
1104 if (!is_root) {
1105 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1106 goto error;
1107 }
1108
7d268848
MD
1109 /* Kernel tracer check */
1110 if (!kernel_tracer_is_initialized()) {
1111 /* Basically, load kernel tracer modules */
1112 ret = init_kernel_tracer();
1113 if (ret != 0) {
1114 goto error;
1115 }
1116 }
1117
917a718d 1118 /* Consumer is in an ERROR state. Report back to client */
412d7227
SM
1119 if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) ==
1120 CONSUMER_ERROR) {
917a718d
JG
1121 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1122 goto error;
1123 }
1124
1125 /* Need a session for kernel command */
1126 if (need_tracing_session) {
1127 if (cmd_ctx->session->kernel_session == NULL) {
1128 ret = create_kernel_session(cmd_ctx->session);
51630bd8 1129 if (ret != LTTNG_OK) {
917a718d
JG
1130 ret = LTTNG_ERR_KERN_SESS_FAIL;
1131 goto error;
1132 }
1133 }
1134
1135 /* Start the kernel consumer daemon */
412d7227
SM
1136 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1137 if (the_kconsumer_data.pid == 0 &&
3a91de3a 1138 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
412d7227
SM
1139 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1140 ret = start_consumerd(&the_kconsumer_data);
917a718d
JG
1141 if (ret < 0) {
1142 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1143 goto error;
1144 }
412d7227 1145 uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED);
917a718d 1146 } else {
412d7227 1147 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
917a718d
JG
1148 }
1149
1150 /*
1151 * The consumer was just spawned so we need to add the socket to
1152 * the consumer output of the session if exist.
1153 */
412d7227 1154 ret = consumer_create_socket(&the_kconsumer_data,
917a718d
JG
1155 cmd_ctx->session->kernel_session->consumer);
1156 if (ret < 0) {
1157 goto error;
1158 }
1159 }
1160
1161 break;
1162 case LTTNG_DOMAIN_JUL:
1163 case LTTNG_DOMAIN_LOG4J:
1164 case LTTNG_DOMAIN_PYTHON:
44760c20
JR
1165 if (!agent_tracing_is_enabled()) {
1166 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1167 goto error;
1168 }
1169 /* Fallthrough */
917a718d
JG
1170 case LTTNG_DOMAIN_UST:
1171 {
1172 if (!ust_app_supported()) {
1173 ret = LTTNG_ERR_NO_UST;
1174 goto error;
1175 }
9124c630 1176
917a718d 1177 /* Consumer is in an ERROR state. Report back to client */
412d7227
SM
1178 if (need_consumerd &&
1179 uatomic_read(&the_ust_consumerd_state) ==
1180 CONSUMER_ERROR) {
917a718d
JG
1181 ret = LTTNG_ERR_NO_USTCONSUMERD;
1182 goto error;
1183 }
1184
1185 if (need_tracing_session) {
1186 /* Create UST session if none exist. */
1187 if (cmd_ctx->session->ust_session == NULL) {
7966af57
SM
1188 lttng_domain domain = cmd_ctx->lsm.domain;
1189 ret = create_ust_session(cmd_ctx->session, &domain);
917a718d
JG
1190 if (ret != LTTNG_OK) {
1191 goto error;
1192 }
1193 }
1194
1195 /* Start the UST consumer daemons */
1196 /* 64-bit */
412d7227
SM
1197 pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex);
1198 if (the_config.consumerd64_bin_path.value &&
1199 the_ustconsumer64_data.pid == 0 &&
3a91de3a 1200 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
412d7227
SM
1201 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1202 ret = start_consumerd(&the_ustconsumer64_data);
917a718d
JG
1203 if (ret < 0) {
1204 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
412d7227 1205 uatomic_set(&the_ust_consumerd64_fd, -EINVAL);
917a718d
JG
1206 goto error;
1207 }
1208
412d7227
SM
1209 uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock);
1210 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
917a718d 1211 } else {
412d7227 1212 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
917a718d
JG
1213 }
1214
1215 /*
1216 * Setup socket for consumer 64 bit. No need for atomic access
1217 * since it was set above and can ONLY be set in this thread.
1218 */
412d7227 1219 ret = consumer_create_socket(&the_ustconsumer64_data,
917a718d
JG
1220 cmd_ctx->session->ust_session->consumer);
1221 if (ret < 0) {
1222 goto error;
1223 }
1224
1225 /* 32-bit */
412d7227
SM
1226 pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex);
1227 if (the_config.consumerd32_bin_path.value &&
1228 the_ustconsumer32_data.pid == 0 &&
3a91de3a 1229 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
412d7227
SM
1230 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1231 ret = start_consumerd(&the_ustconsumer32_data);
917a718d
JG
1232 if (ret < 0) {
1233 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
412d7227 1234 uatomic_set(&the_ust_consumerd32_fd, -EINVAL);
917a718d
JG
1235 goto error;
1236 }
1237
412d7227
SM
1238 uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock);
1239 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
917a718d 1240 } else {
412d7227 1241 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
917a718d
JG
1242 }
1243
1244 /*
1245 * Setup socket for consumer 32 bit. No need for atomic access
1246 * since it was set above and can ONLY be set in this thread.
1247 */
412d7227 1248 ret = consumer_create_socket(&the_ustconsumer32_data,
917a718d
JG
1249 cmd_ctx->session->ust_session->consumer);
1250 if (ret < 0) {
1251 goto error;
1252 }
1253 }
1254 break;
1255 }
1256 default:
1257 break;
1258 }
1259skip_domain:
1260
1261 /* Validate consumer daemon state when start/stop trace command */
3a91de3a
JG
1262 if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE ||
1263 cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) {
1264 switch (cmd_ctx->lsm.domain.type) {
917a718d
JG
1265 case LTTNG_DOMAIN_NONE:
1266 break;
1267 case LTTNG_DOMAIN_JUL:
1268 case LTTNG_DOMAIN_LOG4J:
1269 case LTTNG_DOMAIN_PYTHON:
1270 case LTTNG_DOMAIN_UST:
412d7227 1271 if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) {
917a718d
JG
1272 ret = LTTNG_ERR_NO_USTCONSUMERD;
1273 goto error;
1274 }
1275 break;
1276 case LTTNG_DOMAIN_KERNEL:
412d7227 1277 if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) {
917a718d
JG
1278 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1279 goto error;
1280 }
1281 break;
1282 default:
1283 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1284 goto error;
1285 }
1286 }
1287
1288 /*
d7b377ed 1289 * Check that the UID matches that of the tracing session.
917a718d
JG
1290 * The root user can interact with all sessions.
1291 */
1292 if (need_tracing_session) {
1293 if (!session_access_ok(cmd_ctx->session,
d7b377ed 1294 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) ||
917a718d
JG
1295 cmd_ctx->session->destroyed) {
1296 ret = LTTNG_ERR_EPERM;
1297 goto error;
1298 }
1299 }
1300
1301 /*
1302 * Send relayd information to consumer as soon as we have a domain and a
1303 * session defined.
1304 */
1305 if (cmd_ctx->session && need_domain) {
1306 /*
1307 * Setup relayd if not done yet. If the relayd information was already
1308 * sent to the consumer, this call will gracefully return.
1309 */
1310 ret = cmd_setup_relayd(cmd_ctx->session);
1311 if (ret != LTTNG_OK) {
1312 goto error;
1313 }
1314 }
1315
1316 /* Process by command type */
3a91de3a 1317 switch (cmd_ctx->lsm.cmd_type) {
917a718d
JG
1318 case LTTNG_ADD_CONTEXT:
1319 {
7966af57
SM
1320 lttng_event_context ctx;
1321
917a718d
JG
1322 /*
1323 * An LTTNG_ADD_CONTEXT command might have a supplementary
1324 * payload if the context being added is an application context.
1325 */
3a91de3a 1326 if (cmd_ctx->lsm.u.context.ctx.ctx ==
917a718d
JG
1327 LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1328 char *provider_name = NULL, *context_name = NULL;
1329 size_t provider_name_len =
3a91de3a 1330 cmd_ctx->lsm.u.context.provider_name_len;
917a718d 1331 size_t context_name_len =
3a91de3a 1332 cmd_ctx->lsm.u.context.context_name_len;
917a718d
JG
1333
1334 if (provider_name_len == 0 || context_name_len == 0) {
1335 /*
1336 * Application provider and context names MUST
1337 * be provided.
1338 */
1339 ret = -LTTNG_ERR_INVALID;
1340 goto error;
1341 }
1342
7966af57 1343 provider_name = (char *) zmalloc(provider_name_len + 1);
917a718d
JG
1344 if (!provider_name) {
1345 ret = -LTTNG_ERR_NOMEM;
1346 goto error;
1347 }
3a91de3a 1348 cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name =
917a718d
JG
1349 provider_name;
1350
7966af57 1351 context_name = (char *) zmalloc(context_name_len + 1);
917a718d
JG
1352 if (!context_name) {
1353 ret = -LTTNG_ERR_NOMEM;
1354 goto error_add_context;
1355 }
3a91de3a 1356 cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name =
917a718d
JG
1357 context_name;
1358
3e3665b8 1359 ret = lttcomm_recv_unix_sock(*sock, provider_name,
917a718d
JG
1360 provider_name_len);
1361 if (ret < 0) {
1362 goto error_add_context;
1363 }
1364
3e3665b8 1365 ret = lttcomm_recv_unix_sock(*sock, context_name,
917a718d
JG
1366 context_name_len);
1367 if (ret < 0) {
1368 goto error_add_context;
1369 }
1370 }
1371
1372 /*
1373 * cmd_add_context assumes ownership of the provider and context
1374 * names.
1375 */
7966af57 1376 ctx = cmd_ctx->lsm.u.context.ctx;
917a718d 1377 ret = cmd_add_context(cmd_ctx->session,
3a91de3a
JG
1378 cmd_ctx->lsm.domain.type,
1379 cmd_ctx->lsm.u.context.channel_name,
7966af57 1380 &ctx,
412d7227 1381 the_kernel_poll_pipe[1]);
917a718d 1382
3a91de3a
JG
1383 cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
1384 cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
917a718d 1385error_add_context:
3a91de3a
JG
1386 free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name);
1387 free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name);
917a718d
JG
1388 if (ret < 0) {
1389 goto error;
1390 }
1391 break;
1392 }
1393 case LTTNG_DISABLE_CHANNEL:
1394 {
3a91de3a
JG
1395 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1396 cmd_ctx->lsm.u.disable.channel_name);
917a718d
JG
1397 break;
1398 }
1399 case LTTNG_DISABLE_EVENT:
1400 {
7966af57 1401 lttng_event event;
917a718d
JG
1402
1403 /*
1404 * FIXME: handle filter; for now we just receive the filter's
1405 * bytecode along with the filter expression which are sent by
1406 * liblttng-ctl and discard them.
1407 *
1408 * This fixes an issue where the client may block while sending
1409 * the filter payload and encounter an error because the session
1410 * daemon closes the socket without ever handling this data.
1411 */
3a91de3a
JG
1412 size_t count = cmd_ctx->lsm.u.disable.expression_len +
1413 cmd_ctx->lsm.u.disable.bytecode_len;
917a718d
JG
1414
1415 if (count) {
1416 char data[LTTNG_FILTER_MAX_LEN];
1417
1418 DBG("Discarding disable event command payload of size %zu", count);
1419 while (count) {
3e3665b8 1420 ret = lttcomm_recv_unix_sock(*sock, data,
917a718d
JG
1421 count > sizeof(data) ? sizeof(data) : count);
1422 if (ret < 0) {
1423 goto error;
1424 }
1425
1426 count -= (size_t) ret;
1427 }
1428 }
7966af57 1429 event = cmd_ctx->lsm.u.disable.event;
3a91de3a
JG
1430 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1431 cmd_ctx->lsm.u.disable.channel_name,
7966af57 1432 &event);
917a718d
JG
1433 break;
1434 }
1435 case LTTNG_ENABLE_CHANNEL:
1436 {
3a91de3a
JG
1437 cmd_ctx->lsm.u.channel.chan.attr.extended.ptr =
1438 (struct lttng_channel_extended *) &cmd_ctx->lsm.u.channel.extended;
7966af57
SM
1439 lttng_domain domain = cmd_ctx->lsm.domain;
1440 lttng_channel chan = cmd_ctx->lsm.u.channel.chan;
df4f5a87 1441 ret = cmd_enable_channel(cmd_ctx->session,
7966af57
SM
1442 &domain,
1443 &chan,
412d7227 1444 the_kernel_poll_pipe[1]);
917a718d
JG
1445 break;
1446 }
159b042f
JG
1447 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE:
1448 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE:
917a718d 1449 {
159b042f
JG
1450 struct lttng_dynamic_buffer payload;
1451 struct lttng_buffer_view payload_view;
1452 const bool add_value =
3a91de3a 1453 cmd_ctx->lsm.cmd_type ==
159b042f
JG
1454 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE;
1455 const size_t name_len =
3a91de3a 1456 cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
159b042f
JG
1457 .name_len;
1458 const enum lttng_domain_type domain_type =
1459 (enum lttng_domain_type)
3a91de3a 1460 cmd_ctx->lsm.domain.type;
159b042f 1461 const enum lttng_process_attr process_attr =
3a91de3a 1462 (enum lttng_process_attr) cmd_ctx->lsm.u
159b042f
JG
1463 .process_attr_tracker_add_remove_include_value
1464 .process_attr;
1465 const enum lttng_process_attr_value_type value_type =
1466 (enum lttng_process_attr_value_type) cmd_ctx
3a91de3a 1467 ->lsm.u
159b042f
JG
1468 .process_attr_tracker_add_remove_include_value
1469 .value_type;
1470 struct process_attr_value *value;
1471 enum lttng_error_code ret_code;
1434fd36
MJ
1472 long login_name_max;
1473
1474 login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
1475 if (login_name_max < 0) {
1476 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1477 ret = LTTNG_ERR_INVALID;
1478 goto error;
1479 }
159b042f
JG
1480
1481 /* Receive remaining variable length payload if applicable. */
1434fd36 1482 if (name_len > login_name_max) {
159b042f
JG
1483 /*
1484 * POSIX mandates user and group names that are at least
1485 * 8 characters long. Note that although shadow-utils
1486 * (useradd, groupaadd, etc.) use 32 chars as their
1487 * limit (from bits/utmp.h, UT_NAMESIZE),
1488 * LOGIN_NAME_MAX is defined to 256.
1489 */
1434fd36 1490 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
159b042f 1491 add_value ? "addition" : "removal",
1434fd36 1492 name_len, login_name_max);
159b042f 1493 ret = LTTNG_ERR_INVALID;
2d97a006
JR
1494 goto error;
1495 }
1496
159b042f
JG
1497 lttng_dynamic_buffer_init(&payload);
1498 if (name_len != 0) {
1499 /*
1500 * Receive variable payload for user/group name
1501 * arguments.
1502 */
1503 ret = lttng_dynamic_buffer_set_size(&payload, name_len);
1504 if (ret) {
1505 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1506 add_value ? "add" : "remove");
55c9e7ca 1507 ret = LTTNG_ERR_NOMEM;
159b042f 1508 goto error_add_remove_tracker_value;
55c9e7ca 1509 }
159b042f
JG
1510
1511 ret = lttcomm_recv_unix_sock(
1512 *sock, payload.data, name_len);
55c9e7ca 1513 if (ret <= 0) {
159b042f
JG
1514 ERR("Failed to receive payload of %s process attribute tracker value argument",
1515 add_value ? "add" : "remove");
55c9e7ca 1516 *sock_error = 1;
159b042f
JG
1517 ret = LTTNG_ERR_INVALID_PROTOCOL;
1518 goto error_add_remove_tracker_value;
55c9e7ca 1519 }
159b042f 1520 }
2d97a006 1521
159b042f
JG
1522 payload_view = lttng_buffer_view_from_dynamic_buffer(
1523 &payload, 0, name_len);
3e6e0df2
JG
1524 if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) {
1525 ret = LTTNG_ERR_INVALID_PROTOCOL;
1526 goto error_add_remove_tracker_value;
1527 }
1528
159b042f
JG
1529 /*
1530 * Validate the value type and domains are legal for the process
1531 * attribute tracker that is specified and convert the value to
1532 * add/remove to the internal sessiond representation.
1533 */
1534 ret_code = process_attr_value_from_comm(domain_type,
1535 process_attr, value_type,
3a91de3a 1536 &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
159b042f
JG
1537 .integral_value,
1538 &payload_view, &value);
1539 if (ret_code != LTTNG_OK) {
1540 ret = ret_code;
1541 goto error_add_remove_tracker_value;
55c9e7ca 1542 }
159b042f
JG
1543
1544 if (add_value) {
1545 ret = cmd_process_attr_tracker_inclusion_set_add_value(
1546 cmd_ctx->session, domain_type,
1547 process_attr, value);
1548 } else {
1549 ret = cmd_process_attr_tracker_inclusion_set_remove_value(
1550 cmd_ctx->session, domain_type,
1551 process_attr, value);
1552 }
1553 process_attr_value_destroy(value);
1554 error_add_remove_tracker_value:
1555 lttng_dynamic_buffer_reset(&payload);
1556 break;
1557 }
1558 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1559 {
1560 enum lttng_tracking_policy tracking_policy;
1561 const enum lttng_domain_type domain_type =
1562 (enum lttng_domain_type)
3a91de3a 1563 cmd_ctx->lsm.domain.type;
159b042f 1564 const enum lttng_process_attr process_attr =
3a91de3a 1565 (enum lttng_process_attr) cmd_ctx->lsm.u
159b042f
JG
1566 .process_attr_tracker_get_tracking_policy
1567 .process_attr;
1568
1569 ret = cmd_process_attr_tracker_get_tracking_policy(
1570 cmd_ctx->session, domain_type, process_attr,
1571 &tracking_policy);
1572 if (ret != LTTNG_OK) {
55c9e7ca
JR
1573 goto error;
1574 }
2d97a006 1575
7966af57 1576 uint32_t tracking_policy_u32 = tracking_policy;
159b042f 1577 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
7966af57 1578 &tracking_policy_u32, sizeof(uint32_t));
159b042f
JG
1579 if (ret < 0) {
1580 ret = LTTNG_ERR_NOMEM;
2d97a006
JR
1581 goto error;
1582 }
159b042f 1583 ret = LTTNG_OK;
917a718d
JG
1584 break;
1585 }
159b042f 1586 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY:
917a718d 1587 {
159b042f 1588 const enum lttng_tracking_policy tracking_policy =
3a91de3a 1589 (enum lttng_tracking_policy) cmd_ctx->lsm.u
159b042f
JG
1590 .process_attr_tracker_set_tracking_policy
1591 .tracking_policy;
1592 const enum lttng_domain_type domain_type =
1593 (enum lttng_domain_type)
3a91de3a 1594 cmd_ctx->lsm.domain.type;
159b042f 1595 const enum lttng_process_attr process_attr =
3a91de3a 1596 (enum lttng_process_attr) cmd_ctx->lsm.u
159b042f
JG
1597 .process_attr_tracker_set_tracking_policy
1598 .process_attr;
1599
1600 ret = cmd_process_attr_tracker_set_tracking_policy(
1601 cmd_ctx->session, domain_type, process_attr,
1602 tracking_policy);
1603 if (ret != LTTNG_OK) {
1604 goto error;
55c9e7ca 1605 }
159b042f
JG
1606 break;
1607 }
1608 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1609 {
1610 struct lttng_process_attr_values *values;
1611 struct lttng_dynamic_buffer reply;
1612 const enum lttng_domain_type domain_type =
1613 (enum lttng_domain_type)
3a91de3a 1614 cmd_ctx->lsm.domain.type;
159b042f 1615 const enum lttng_process_attr process_attr =
3a91de3a 1616 (enum lttng_process_attr) cmd_ctx->lsm.u
159b042f
JG
1617 .process_attr_tracker_get_inclusion_set
1618 .process_attr;
1619
1620 ret = cmd_process_attr_tracker_get_inclusion_set(
1621 cmd_ctx->session, domain_type, process_attr,
1622 &values);
1623 if (ret != LTTNG_OK) {
55c9e7ca
JR
1624 goto error;
1625 }
2d97a006 1626
159b042f
JG
1627 lttng_dynamic_buffer_init(&reply);
1628 ret = lttng_process_attr_values_serialize(values, &reply);
1629 if (ret < 0) {
1630 goto error_tracker_get_inclusion_set;
2d97a006
JR
1631 }
1632
159b042f
JG
1633 ret = setup_lttng_msg_no_cmd_header(
1634 cmd_ctx, reply.data, reply.size);
1635 if (ret < 0) {
1636 ret = LTTNG_ERR_NOMEM;
1637 goto error_tracker_get_inclusion_set;
1638 }
1639 ret = LTTNG_OK;
1640
1641 error_tracker_get_inclusion_set:
1642 lttng_process_attr_values_destroy(values);
1643 lttng_dynamic_buffer_reset(&reply);
917a718d
JG
1644 break;
1645 }
1646 case LTTNG_ENABLE_EVENT:
1647 {
1648 struct lttng_event *ev = NULL;
1649 struct lttng_event_exclusion *exclusion = NULL;
2b00d462 1650 struct lttng_bytecode *bytecode = NULL;
917a718d 1651 char *filter_expression = NULL;
7966af57
SM
1652 lttng_event event;
1653 lttng_domain domain;
917a718d
JG
1654
1655 /* Handle exclusion events and receive it from the client. */
3a91de3a
JG
1656 if (cmd_ctx->lsm.u.enable.exclusion_count > 0) {
1657 size_t count = cmd_ctx->lsm.u.enable.exclusion_count;
917a718d 1658
7966af57 1659 exclusion = (lttng_event_exclusion *) zmalloc(sizeof(struct lttng_event_exclusion) +
917a718d
JG
1660 (count * LTTNG_SYMBOL_NAME_LEN));
1661 if (!exclusion) {
1662 ret = LTTNG_ERR_EXCLUSION_NOMEM;
1663 goto error;
1664 }
1665
1666 DBG("Receiving var len exclusion event list from client ...");
1667 exclusion->count = count;
3e3665b8 1668 ret = lttcomm_recv_unix_sock(*sock, exclusion->names,
917a718d
JG
1669 count * LTTNG_SYMBOL_NAME_LEN);
1670 if (ret <= 0) {
1671 DBG("Nothing recv() from client var len data... continuing");
1672 *sock_error = 1;
1673 free(exclusion);
1674 ret = LTTNG_ERR_EXCLUSION_INVAL;
1675 goto error;
1676 }
1677 }
1678
1679 /* Get filter expression from client. */
3a91de3a 1680 if (cmd_ctx->lsm.u.enable.expression_len > 0) {
917a718d 1681 size_t expression_len =
3a91de3a 1682 cmd_ctx->lsm.u.enable.expression_len;
917a718d
JG
1683
1684 if (expression_len > LTTNG_FILTER_MAX_LEN) {
1685 ret = LTTNG_ERR_FILTER_INVAL;
1686 free(exclusion);
1687 goto error;
1688 }
1689
7966af57 1690 filter_expression = (char *) zmalloc(expression_len);
917a718d
JG
1691 if (!filter_expression) {
1692 free(exclusion);
1693 ret = LTTNG_ERR_FILTER_NOMEM;
1694 goto error;
1695 }
1696
1697 /* Receive var. len. data */
1698 DBG("Receiving var len filter's expression from client ...");
3e3665b8 1699 ret = lttcomm_recv_unix_sock(*sock, filter_expression,
917a718d
JG
1700 expression_len);
1701 if (ret <= 0) {
1702 DBG("Nothing recv() from client var len data... continuing");
1703 *sock_error = 1;
1704 free(filter_expression);
1705 free(exclusion);
1706 ret = LTTNG_ERR_FILTER_INVAL;
1707 goto error;
1708 }
1709 }
1710
1711 /* Handle filter and get bytecode from client. */
3a91de3a
JG
1712 if (cmd_ctx->lsm.u.enable.bytecode_len > 0) {
1713 size_t bytecode_len = cmd_ctx->lsm.u.enable.bytecode_len;
917a718d
JG
1714
1715 if (bytecode_len > LTTNG_FILTER_MAX_LEN) {
1716 ret = LTTNG_ERR_FILTER_INVAL;
1717 free(filter_expression);
1718 free(exclusion);
1719 goto error;
1720 }
1721
7966af57 1722 bytecode = (lttng_bytecode *) zmalloc(bytecode_len);
917a718d
JG
1723 if (!bytecode) {
1724 free(filter_expression);
1725 free(exclusion);
1726 ret = LTTNG_ERR_FILTER_NOMEM;
1727 goto error;
1728 }
1729
1730 /* Receive var. len. data */
1731 DBG("Receiving var len filter's bytecode from client ...");
3e3665b8 1732 ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len);
917a718d
JG
1733 if (ret <= 0) {
1734 DBG("Nothing recv() from client var len data... continuing");
1735 *sock_error = 1;
1736 free(filter_expression);
1737 free(bytecode);
1738 free(exclusion);
1739 ret = LTTNG_ERR_FILTER_INVAL;
1740 goto error;
1741 }
1742
1743 if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) {
1744 free(filter_expression);
1745 free(bytecode);
1746 free(exclusion);
1747 ret = LTTNG_ERR_FILTER_INVAL;
1748 goto error;
1749 }
1750 }
1751
7966af57
SM
1752 event = cmd_ctx->lsm.u.enable.event;
1753 ev = lttng_event_copy(&event);
917a718d
JG
1754 if (!ev) {
1755 DBG("Failed to copy event: %s",
3a91de3a 1756 cmd_ctx->lsm.u.enable.event.name);
917a718d
JG
1757 free(filter_expression);
1758 free(bytecode);
1759 free(exclusion);
1760 ret = LTTNG_ERR_NOMEM;
1761 goto error;
1762 }
1763
1764
3a91de3a 1765 if (cmd_ctx->lsm.u.enable.userspace_probe_location_len > 0) {
917a718d 1766 /* Expect a userspace probe description. */
3e3665b8 1767 ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev);
917a718d
JG
1768 if (ret) {
1769 free(filter_expression);
1770 free(bytecode);
1771 free(exclusion);
1772 lttng_event_destroy(ev);
1773 goto error;
1774 }
1775 }
1776
7966af57 1777 domain = cmd_ctx->lsm.domain;
df4f5a87 1778 ret = cmd_enable_event(cmd_ctx->session,
7966af57 1779 &domain,
3a91de3a 1780 cmd_ctx->lsm.u.enable.channel_name,
917a718d
JG
1781 ev,
1782 filter_expression, bytecode, exclusion,
412d7227 1783 the_kernel_poll_pipe[1]);
917a718d
JG
1784 lttng_event_destroy(ev);
1785 break;
1786 }
1787 case LTTNG_LIST_TRACEPOINTS:
1788 {
1789 struct lttng_event *events;
1790 ssize_t nb_events;
1791
1792 session_lock_list();
3a91de3a 1793 nb_events = cmd_list_tracepoints(cmd_ctx->lsm.domain.type, &events);
917a718d
JG
1794 session_unlock_list();
1795 if (nb_events < 0) {
1796 /* Return value is a negative lttng_error_code. */
1797 ret = -nb_events;
1798 goto error;
1799 }
1800
1801 /*
1802 * Setup lttng message with payload size set to the event list size in
1803 * bytes and then copy list into the llm payload.
1804 */
1805 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events,
1806 sizeof(struct lttng_event) * nb_events);
1807 free(events);
1808
1809 if (ret < 0) {
1810 goto setup_error;
1811 }
1812
1813 ret = LTTNG_OK;
1814 break;
1815 }
1816 case LTTNG_LIST_TRACEPOINT_FIELDS:
1817 {
1818 struct lttng_event_field *fields;
1819 ssize_t nb_fields;
1820
1821 session_lock_list();
3a91de3a 1822 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm.domain.type,
917a718d
JG
1823 &fields);
1824 session_unlock_list();
1825 if (nb_fields < 0) {
1826 /* Return value is a negative lttng_error_code. */
1827 ret = -nb_fields;
1828 goto error;
1829 }
1830
1831 /*
1832 * Setup lttng message with payload size set to the event list size in
1833 * bytes and then copy list into the llm payload.
1834 */
1835 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields,
1836 sizeof(struct lttng_event_field) * nb_fields);
1837 free(fields);
1838
1839 if (ret < 0) {
1840 goto setup_error;
1841 }
1842
1843 ret = LTTNG_OK;
1844 break;
1845 }
1846 case LTTNG_LIST_SYSCALLS:
1847 {
1848 struct lttng_event *events;
1849 ssize_t nb_events;
1850
1851 nb_events = cmd_list_syscalls(&events);
1852 if (nb_events < 0) {
1853 /* Return value is a negative lttng_error_code. */
1854 ret = -nb_events;
1855 goto error;
1856 }
1857
1858 /*
1859 * Setup lttng message with payload size set to the event list size in
1860 * bytes and then copy list into the llm payload.
1861 */
1862 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events,
1863 sizeof(struct lttng_event) * nb_events);
1864 free(events);
1865
1866 if (ret < 0) {
1867 goto setup_error;
1868 }
1869
1870 ret = LTTNG_OK;
1871 break;
1872 }
917a718d
JG
1873 case LTTNG_SET_CONSUMER_URI:
1874 {
1875 size_t nb_uri, len;
1876 struct lttng_uri *uris;
1877
3a91de3a 1878 nb_uri = cmd_ctx->lsm.u.uri.size;
917a718d
JG
1879 len = nb_uri * sizeof(struct lttng_uri);
1880
1881 if (nb_uri == 0) {
1882 ret = LTTNG_ERR_INVALID;
1883 goto error;
1884 }
1885
7966af57 1886 uris = (lttng_uri *) zmalloc(len);
917a718d
JG
1887 if (uris == NULL) {
1888 ret = LTTNG_ERR_FATAL;
1889 goto error;
1890 }
1891
1892 /* Receive variable len data */
1893 DBG("Receiving %zu URI(s) from client ...", nb_uri);
3e3665b8 1894 ret = lttcomm_recv_unix_sock(*sock, uris, len);
917a718d
JG
1895 if (ret <= 0) {
1896 DBG("No URIs received from client... continuing");
1897 *sock_error = 1;
1898 ret = LTTNG_ERR_SESSION_FAIL;
1899 free(uris);
1900 goto error;
1901 }
1902
1903 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
1904 free(uris);
1905 if (ret != LTTNG_OK) {
1906 goto error;
1907 }
1908
1909
1910 break;
1911 }
1912 case LTTNG_START_TRACE:
1913 {
1914 /*
1915 * On the first start, if we have a kernel session and we have
1916 * enabled time or size-based rotations, we have to make sure
1917 * the kernel tracer supports it.
1918 */
1919 if (!cmd_ctx->session->has_been_started && \
1920 cmd_ctx->session->kernel_session && \
1921 (cmd_ctx->session->rotate_timer_period || \
1922 cmd_ctx->session->rotate_size) && \
1923 !check_rotate_compatible()) {
1924 DBG("Kernel tracer version is not compatible with the rotation feature");
1925 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
1926 goto error;
1927 }
1928 ret = cmd_start_trace(cmd_ctx->session);
1929 break;
1930 }
1931 case LTTNG_STOP_TRACE:
1932 {
1933 ret = cmd_stop_trace(cmd_ctx->session);
1934 break;
1935 }
917a718d
JG
1936 case LTTNG_DESTROY_SESSION:
1937 {
1938 ret = cmd_destroy_session(cmd_ctx->session,
412d7227 1939 the_notification_thread_handle, sock);
917a718d
JG
1940 break;
1941 }
1942 case LTTNG_LIST_DOMAINS:
1943 {
1944 ssize_t nb_dom;
1945 struct lttng_domain *domains = NULL;
1946
1947 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
1948 if (nb_dom < 0) {
1949 /* Return value is a negative lttng_error_code. */
1950 ret = -nb_dom;
1951 goto error;
1952 }
1953
1954 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
1955 nb_dom * sizeof(struct lttng_domain));
1956 free(domains);
1957
1958 if (ret < 0) {
1959 goto setup_error;
1960 }
1961
1962 ret = LTTNG_OK;
1963 break;
1964 }
1965 case LTTNG_LIST_CHANNELS:
1966 {
1967 ssize_t payload_size;
1968 struct lttng_channel *channels = NULL;
1969
3a91de3a 1970 payload_size = cmd_list_channels(cmd_ctx->lsm.domain.type,
917a718d
JG
1971 cmd_ctx->session, &channels);
1972 if (payload_size < 0) {
1973 /* Return value is a negative lttng_error_code. */
1974 ret = -payload_size;
1975 goto error;
1976 }
1977
1978 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels,
1979 payload_size);
1980 free(channels);
1981
1982 if (ret < 0) {
1983 goto setup_error;
1984 }
1985
1986 ret = LTTNG_OK;
1987 break;
1988 }
1989 case LTTNG_LIST_EVENTS:
1990 {
e368fb43
JG
1991 ssize_t list_ret;
1992 struct lttcomm_event_command_header cmd_header = {};
1993 size_t original_payload_size;
1994 size_t payload_size;
1995
1996 ret = setup_empty_lttng_msg(cmd_ctx);
1997 if (ret) {
1998 ret = LTTNG_ERR_NOMEM;
1999 goto setup_error;
917a718d
JG
2000 }
2001
e368fb43 2002 original_payload_size = cmd_ctx->reply_payload.buffer.size;
917a718d 2003
e368fb43
JG
2004 /* Extended infos are included at the end of the payload. */
2005 list_ret = cmd_list_events(cmd_ctx->lsm.domain.type,
2006 cmd_ctx->session,
2007 cmd_ctx->lsm.u.list.channel_name,
2008 &cmd_ctx->reply_payload);
2009 if (list_ret < 0) {
2010 /* Return value is a negative lttng_error_code. */
2011 ret = -list_ret;
2012 goto error;
917a718d
JG
2013 }
2014
e368fb43
JG
2015 payload_size = cmd_ctx->reply_payload.buffer.size -
2016 sizeof(cmd_header) - original_payload_size;
2017 update_lttng_msg(cmd_ctx, sizeof(cmd_header), payload_size);
2018
917a718d
JG
2019 ret = LTTNG_OK;
2020 break;
2021 }
2022 case LTTNG_LIST_SESSIONS:
2023 {
2024 unsigned int nr_sessions;
7966af57 2025 lttng_session *sessions_payload;
917a718d
JG
2026 size_t payload_len;
2027
2028 session_lock_list();
2029 nr_sessions = lttng_sessions_count(
2030 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2031 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
b178f53e
JG
2032
2033 payload_len = (sizeof(struct lttng_session) * nr_sessions) +
2034 (sizeof(struct lttng_session_extended) * nr_sessions);
7966af57 2035 sessions_payload = (lttng_session *) zmalloc(payload_len);
917a718d
JG
2036
2037 if (!sessions_payload) {
2038 session_unlock_list();
2039 ret = -ENOMEM;
2040 goto setup_error;
2041 }
2042
b178f53e 2043 cmd_list_lttng_sessions(sessions_payload, nr_sessions,
917a718d
JG
2044 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2045 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
2046 session_unlock_list();
2047
2048 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload,
2049 payload_len);
2050 free(sessions_payload);
2051
2052 if (ret < 0) {
2053 goto setup_error;
2054 }
2055
2056 ret = LTTNG_OK;
2057 break;
2058 }
2059 case LTTNG_REGISTER_CONSUMER:
2060 {
2061 struct consumer_data *cdata;
2062
3a91de3a 2063 switch (cmd_ctx->lsm.domain.type) {
917a718d 2064 case LTTNG_DOMAIN_KERNEL:
412d7227 2065 cdata = &the_kconsumer_data;
917a718d
JG
2066 break;
2067 default:
2068 ret = LTTNG_ERR_UND;
2069 goto error;
2070 }
2071
3a91de3a
JG
2072 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type,
2073 cmd_ctx->lsm.u.reg.path, cdata);
917a718d
JG
2074 break;
2075 }
2076 case LTTNG_DATA_PENDING:
2077 {
2078 int pending_ret;
2079 uint8_t pending_ret_byte;
2080
2081 pending_ret = cmd_data_pending(cmd_ctx->session);
2082
2083 /*
2084 * FIXME
2085 *
2086 * This function may returns 0 or 1 to indicate whether or not
2087 * there is data pending. In case of error, it should return an
2088 * LTTNG_ERR code. However, some code paths may still return
2089 * a nondescript error code, which we handle by returning an
2090 * "unknown" error.
2091 */
2092 if (pending_ret == 0 || pending_ret == 1) {
2093 /*
2094 * ret will be set to LTTNG_OK at the end of
2095 * this function.
2096 */
2097 } else if (pending_ret < 0) {
2098 ret = LTTNG_ERR_UNK;
2099 goto setup_error;
2100 } else {
2101 ret = pending_ret;
2102 goto setup_error;
2103 }
2104
2105 pending_ret_byte = (uint8_t) pending_ret;
2106
2107 /* 1 byte to return whether or not data is pending */
2108 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
2109 &pending_ret_byte, 1);
2110
2111 if (ret < 0) {
2112 goto setup_error;
2113 }
2114
2115 ret = LTTNG_OK;
2116 break;
2117 }
2118 case LTTNG_SNAPSHOT_ADD_OUTPUT:
2119 {
a914e76a 2120 uint32_t snapshot_id;
917a718d 2121 struct lttcomm_lttng_output_id reply;
7966af57 2122 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
917a718d
JG
2123
2124 ret = cmd_snapshot_add_output(cmd_ctx->session,
7966af57 2125 &output,
df4f5a87 2126 &snapshot_id);
917a718d
JG
2127 if (ret != LTTNG_OK) {
2128 goto error;
2129 }
a914e76a 2130 reply.id = snapshot_id;
917a718d
JG
2131
2132 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
2133 sizeof(reply));
2134 if (ret < 0) {
2135 goto setup_error;
2136 }
2137
2138 /* Copy output list into message payload */
2139 ret = LTTNG_OK;
2140 break;
2141 }
2142 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2143 {
7966af57
SM
2144 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
2145 ret = cmd_snapshot_del_output(cmd_ctx->session, &output);
917a718d
JG
2146 break;
2147 }
2148 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2149 {
2150 ssize_t nb_output;
2151 struct lttng_snapshot_output *outputs = NULL;
2152
2153 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
2154 if (nb_output < 0) {
2155 ret = -nb_output;
2156 goto error;
2157 }
2158
a0377dfe 2159 LTTNG_ASSERT((nb_output > 0 && outputs) || nb_output == 0);
917a718d
JG
2160 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
2161 nb_output * sizeof(struct lttng_snapshot_output));
2162 free(outputs);
2163
2164 if (ret < 0) {
2165 goto setup_error;
2166 }
2167
2168 ret = LTTNG_OK;
2169 break;
2170 }
2171 case LTTNG_SNAPSHOT_RECORD:
2172 {
7966af57 2173 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_record.output;
917a718d 2174 ret = cmd_snapshot_record(cmd_ctx->session,
7966af57 2175 &output,
3a91de3a 2176 cmd_ctx->lsm.u.snapshot_record.wait);
917a718d
JG
2177 break;
2178 }
b178f53e 2179 case LTTNG_CREATE_SESSION_EXT:
917a718d 2180 {
b178f53e
JG
2181 struct lttng_dynamic_buffer payload;
2182 struct lttng_session_descriptor *return_descriptor = NULL;
917a718d 2183
b178f53e 2184 lttng_dynamic_buffer_init(&payload);
3e3665b8 2185 ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor);
b178f53e
JG
2186 if (ret != LTTNG_OK) {
2187 goto error;
917a718d
JG
2188 }
2189
b178f53e
JG
2190 ret = lttng_session_descriptor_serialize(return_descriptor,
2191 &payload);
2192 if (ret) {
2193 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2194 lttng_session_descriptor_destroy(return_descriptor);
2195 ret = LTTNG_ERR_NOMEM;
2196 goto error;
917a718d 2197 }
b178f53e
JG
2198 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data,
2199 payload.size);
2200 if (ret) {
2201 lttng_session_descriptor_destroy(return_descriptor);
2202 ret = LTTNG_ERR_NOMEM;
2203 goto error;
2204 }
2205 lttng_dynamic_buffer_reset(&payload);
2206 lttng_session_descriptor_destroy(return_descriptor);
2207 ret = LTTNG_OK;
917a718d
JG
2208 break;
2209 }
2210 case LTTNG_SAVE_SESSION:
2211 {
3a91de3a 2212 ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr,
917a718d
JG
2213 &cmd_ctx->creds);
2214 break;
2215 }
2216 case LTTNG_SET_SESSION_SHM_PATH:
2217 {
2218 ret = cmd_set_session_shm_path(cmd_ctx->session,
3a91de3a 2219 cmd_ctx->lsm.u.set_shm_path.shm_path);
917a718d
JG
2220 break;
2221 }
2222 case LTTNG_REGENERATE_METADATA:
2223 {
2224 ret = cmd_regenerate_metadata(cmd_ctx->session);
2225 break;
2226 }
2227 case LTTNG_REGENERATE_STATEDUMP:
2228 {
2229 ret = cmd_regenerate_statedump(cmd_ctx->session);
2230 break;
2231 }
2232 case LTTNG_REGISTER_TRIGGER:
2233 {
746e08d7 2234 struct lttng_trigger *payload_trigger;
242388e4 2235 struct lttng_trigger *return_trigger;
746e08d7
JG
2236 size_t original_reply_payload_size;
2237 size_t reply_payload_size;
2238 const struct lttng_credentials cmd_creds = {
2239 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2240 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2241 };
242388e4
JR
2242
2243 ret = setup_empty_lttng_msg(cmd_ctx);
2244 if (ret) {
2245 ret = LTTNG_ERR_NOMEM;
2246 goto setup_error;
2247 }
2248
746e08d7
JG
2249 ret = receive_lttng_trigger(
2250 cmd_ctx, *sock, sock_error, &payload_trigger);
2251 if (ret != LTTNG_OK) {
2252 goto error;
2253 }
2254
2255 original_reply_payload_size = cmd_ctx->reply_payload.buffer.size;
242388e4 2256
746e08d7 2257 ret = cmd_register_trigger(&cmd_creds, payload_trigger,
0efb2ad7 2258 cmd_ctx->lsm.u.trigger.is_trigger_anonymous,
412d7227
SM
2259 the_notification_thread_handle,
2260 &return_trigger);
242388e4 2261 if (ret != LTTNG_OK) {
746e08d7 2262 lttng_trigger_put(payload_trigger);
242388e4
JR
2263 goto error;
2264 }
2265
2266 ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload);
746e08d7
JG
2267 lttng_trigger_put(payload_trigger);
2268 lttng_trigger_put(return_trigger);
242388e4
JR
2269 if (ret) {
2270 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2271 ret = LTTNG_ERR_NOMEM;
242388e4
JR
2272 goto error;
2273 }
2274
746e08d7
JG
2275 reply_payload_size = cmd_ctx->reply_payload.buffer.size -
2276 original_reply_payload_size;
242388e4 2277
746e08d7 2278 update_lttng_msg(cmd_ctx, 0, reply_payload_size);
242388e4
JR
2279
2280 ret = LTTNG_OK;
917a718d
JG
2281 break;
2282 }
2283 case LTTNG_UNREGISTER_TRIGGER:
2284 {
746e08d7
JG
2285 struct lttng_trigger *payload_trigger;
2286 const struct lttng_credentials cmd_creds = {
2287 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2288 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2289 };
2290
2291 ret = receive_lttng_trigger(
2292 cmd_ctx, *sock, sock_error, &payload_trigger);
2293 if (ret != LTTNG_OK) {
2294 goto error;
2295 }
2296
2297 ret = cmd_unregister_trigger(&cmd_creds, payload_trigger,
412d7227 2298 the_notification_thread_handle);
746e08d7 2299 lttng_trigger_put(payload_trigger);
917a718d
JG
2300 break;
2301 }
2302 case LTTNG_ROTATE_SESSION:
2303 {
2304 struct lttng_rotate_session_return rotate_return;
2305
2306 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
2307
2308 memset(&rotate_return, 0, sizeof(rotate_return));
2309 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2310 DBG("Kernel tracer version is not compatible with the rotation feature");
2311 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2312 goto error;
2313 }
2314
7fdbed1c 2315 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return,
343defc2
MD
2316 false,
2317 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
917a718d
JG
2318 if (ret < 0) {
2319 ret = -ret;
2320 goto error;
2321 }
2322
2323 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
2324 sizeof(rotate_return));
2325 if (ret < 0) {
2326 ret = -ret;
2327 goto error;
2328 }
2329
2330 ret = LTTNG_OK;
2331 break;
2332 }
2333 case LTTNG_ROTATION_GET_INFO:
2334 {
2335 struct lttng_rotation_get_info_return get_info_return;
2336
2337 memset(&get_info_return, 0, sizeof(get_info_return));
2338 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
3a91de3a 2339 cmd_ctx->lsm.u.get_rotation_info.rotation_id);
917a718d
JG
2340 if (ret < 0) {
2341 ret = -ret;
2342 goto error;
2343 }
2344
2345 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
2346 sizeof(get_info_return));
2347 if (ret < 0) {
2348 ret = -ret;
2349 goto error;
2350 }
2351
2352 ret = LTTNG_OK;
2353 break;
2354 }
2355 case LTTNG_ROTATION_SET_SCHEDULE:
2356 {
2357 bool set_schedule;
2358 enum lttng_rotation_schedule_type schedule_type;
2359 uint64_t value;
2360
2361 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2362 DBG("Kernel tracer version does not support session rotations");
2363 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2364 goto error;
2365 }
2366
3a91de3a
JG
2367 set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1;
2368 schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type;
2369 value = cmd_ctx->lsm.u.rotation_set_schedule.value;
917a718d 2370
412d7227
SM
2371 ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule,
2372 schedule_type, value,
2373 the_notification_thread_handle);
917a718d
JG
2374 if (ret != LTTNG_OK) {
2375 goto error;
2376 }
2377
2378 break;
2379 }
2380 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
2381 {
7966af57
SM
2382 lttng_session_list_schedules_return schedules;
2383
2384 schedules.periodic.set = !!cmd_ctx->session->rotate_timer_period;
2385 schedules.periodic.value = cmd_ctx->session->rotate_timer_period;
2386 schedules.size.set = !!cmd_ctx->session->rotate_size;
2387 schedules.size.value = cmd_ctx->session->rotate_size;
917a718d
JG
2388
2389 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
2390 sizeof(schedules));
2391 if (ret < 0) {
2392 ret = -ret;
2393 goto error;
2394 }
2395
2396 ret = LTTNG_OK;
2397 break;
2398 }
022349df
MD
2399 case LTTNG_CLEAR_SESSION:
2400 {
2401 ret = cmd_clear_session(cmd_ctx->session, sock);
2402 break;
2403 }
fbc9f37d
JR
2404 case LTTNG_LIST_TRIGGERS:
2405 {
2406 struct lttng_triggers *return_triggers = NULL;
2407 size_t original_payload_size;
2408 size_t payload_size;
2409
2410 ret = setup_empty_lttng_msg(cmd_ctx);
2411 if (ret) {
2412 ret = LTTNG_ERR_NOMEM;
2413 goto setup_error;
2414 }
2415
2416 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2417
412d7227
SM
2418 ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle,
2419 &return_triggers);
fbc9f37d
JR
2420 if (ret != LTTNG_OK) {
2421 goto error;
2422 }
2423
a0377dfe 2424 LTTNG_ASSERT(return_triggers);
fbc9f37d
JR
2425 ret = lttng_triggers_serialize(
2426 return_triggers, &cmd_ctx->reply_payload);
2427 lttng_triggers_destroy(return_triggers);
2428 if (ret) {
2429 ERR("Failed to serialize triggers in reply to `list triggers` command");
2430 ret = LTTNG_ERR_NOMEM;
2431 goto error;
2432 }
2433
2434 payload_size = cmd_ctx->reply_payload.buffer.size -
2435 original_payload_size;
2436
2437 update_lttng_msg(cmd_ctx, 0, payload_size);
2438
2439 ret = LTTNG_OK;
2440 break;
2441 }
588c4b0d
JG
2442 case LTTNG_EXECUTE_ERROR_QUERY:
2443 {
2444 struct lttng_error_query *query;
2445 const struct lttng_credentials cmd_creds = {
2446 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2447 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2448 };
2449 struct lttng_error_query_results *results = NULL;
2450 size_t original_payload_size;
2451 size_t payload_size;
2452
2453 ret = setup_empty_lttng_msg(cmd_ctx);
2454 if (ret) {
2455 ret = LTTNG_ERR_NOMEM;
2456 goto setup_error;
2457 }
2458
2459 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2460
2461 ret = receive_lttng_error_query(
2462 cmd_ctx, *sock, sock_error, &query);
2463 if (ret != LTTNG_OK) {
2464 goto error;
2465 }
2466
2467 ret = cmd_execute_error_query(&cmd_creds, query, &results,
2468 the_notification_thread_handle);
2469 lttng_error_query_destroy(query);
2470 if (ret != LTTNG_OK) {
2471 goto error;
2472 }
2473
a0377dfe 2474 LTTNG_ASSERT(results);
588c4b0d
JG
2475 ret = lttng_error_query_results_serialize(
2476 results, &cmd_ctx->reply_payload);
2477 lttng_error_query_results_destroy(results);
2478 if (ret) {
2479 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2480 ret = LTTNG_ERR_NOMEM;
2481 goto error;
2482 }
2483
2484 payload_size = cmd_ctx->reply_payload.buffer.size -
2485 original_payload_size;
2486
2487 update_lttng_msg(cmd_ctx, 0, payload_size);
2488
2489 ret = LTTNG_OK;
2490
2491 break;
2492 }
917a718d
JG
2493 default:
2494 ret = LTTNG_ERR_UND;
2495 break;
2496 }
2497
2498error:
3a91de3a
JG
2499 if (cmd_ctx->reply_payload.buffer.size == 0) {
2500 DBG("Missing llm header, creating one.");
917a718d
JG
2501 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
2502 goto setup_error;
2503 }
2504 }
2505 /* Set return code */
3a91de3a 2506 ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret;
917a718d
JG
2507setup_error:
2508 if (cmd_ctx->session) {
2509 session_unlock(cmd_ctx->session);
2510 session_put(cmd_ctx->session);
3e3665b8 2511 cmd_ctx->session = NULL;
917a718d
JG
2512 }
2513 if (need_tracing_session) {
2514 session_unlock_list();
2515 }
2516init_setup_error:
a0377dfe 2517 LTTNG_ASSERT(!rcu_read_ongoing());
917a718d
JG
2518 return ret;
2519}
2520
2521static int create_client_sock(void)
2522{
2523 int ret, client_sock;
2524 const mode_t old_umask = umask(0);
2525
2526 /* Create client tool unix socket */
412d7227
SM
2527 client_sock = lttcomm_create_unix_sock(
2528 the_config.client_unix_sock_path.value);
917a718d 2529 if (client_sock < 0) {
412d7227
SM
2530 ERR("Create unix sock failed: %s",
2531 the_config.client_unix_sock_path.value);
917a718d
JG
2532 ret = -1;
2533 goto end;
2534 }
2535
2536 /* Set the cloexec flag */
2537 ret = utils_set_fd_cloexec(client_sock);
2538 if (ret < 0) {
2539 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2540 "Continuing but note that the consumer daemon will have a "
2541 "reference to this socket on exec()", client_sock);
2542 }
2543
2544 /* File permission MUST be 660 */
412d7227
SM
2545 ret = chmod(the_config.client_unix_sock_path.value,
2546 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
917a718d 2547 if (ret < 0) {
18972083 2548 ERR("Set file permissions failed: %s",
412d7227 2549 the_config.client_unix_sock_path.value);
917a718d 2550 PERROR("chmod");
18972083
JR
2551 (void) lttcomm_close_unix_sock(client_sock);
2552 ret = -1;
917a718d
JG
2553 goto end;
2554 }
2555 DBG("Created client socket (fd = %i)", client_sock);
2556 ret = client_sock;
2557end:
2558 umask(old_umask);
2559 return ret;
2560}
2561
2562static void cleanup_client_thread(void *data)
2563{
7966af57 2564 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
917a718d
JG
2565
2566 lttng_pipe_destroy(quit_pipe);
2567}
2568
6cb45e93
JG
2569static void thread_init_cleanup(void *data)
2570{
2571 set_thread_status(false);
2572}
2573
917a718d
JG
2574/*
2575 * This thread manage all clients request using the unix client socket for
2576 * communication.
2577 */
2578static void *thread_manage_clients(void *data)
2579{
2580 int sock = -1, ret, i, pollfd, err = -1;
2581 int sock_error;
2582 uint32_t revents, nb_fd;
917a718d 2583 struct lttng_poll_event events;
0f68efb6 2584 const int client_sock = thread_state.client_sock;
7966af57 2585 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
917a718d 2586 const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe);
3a91de3a 2587 struct command_ctx cmd_ctx = {};
917a718d
JG
2588
2589 DBG("[thread] Manage client started");
2590
3a91de3a
JG
2591 lttng_payload_init(&cmd_ctx.reply_payload);
2592
917a718d
JG
2593 is_root = (getuid() == 0);
2594
6cb45e93 2595 pthread_cleanup_push(thread_init_cleanup, NULL);
917a718d
JG
2596
2597 rcu_register_thread();
2598
412d7227 2599 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
917a718d
JG
2600
2601 health_code_update();
2602
2603 ret = lttcomm_listen_unix_sock(client_sock);
2604 if (ret < 0) {
2605 goto error_listen;
2606 }
2607
2608 /*
2609 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2610 * more will be added to this poll set.
2611 */
2612 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2613 if (ret < 0) {
2614 goto error_create_poll;
2615 }
2616
2617 /* Add the application registration socket */
2618 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2619 if (ret < 0) {
2620 goto error;
2621 }
2622
2623 /* Add thread quit pipe */
2624 ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR);
2625 if (ret < 0) {
2626 goto error;
2627 }
2628
6cb45e93 2629 /* Set state as running. */
0d163d56 2630 set_thread_status(true);
6cb45e93
JG
2631 pthread_cleanup_pop(0);
2632
917a718d
JG
2633 /* This testpoint is after we signal readiness to the parent. */
2634 if (testpoint(sessiond_thread_manage_clients)) {
2635 goto error;
2636 }
2637
2638 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
2639 goto error;
2640 }
2641
2642 health_code_update();
2643
917a718d
JG
2644 while (1) {
2645 const struct cmd_completion_handler *cmd_completion_handler;
2646
7966af57
SM
2647 cmd_ctx.creds.uid = UINT32_MAX;
2648 cmd_ctx.creds.gid = UINT32_MAX;
2649 cmd_ctx.creds.pid = 0;
3a91de3a 2650 cmd_ctx.session = NULL;
fe489250 2651 lttng_payload_clear(&cmd_ctx.reply_payload);
e368fb43 2652 cmd_ctx.lttng_msg_size = 0;
3a91de3a 2653
917a718d
JG
2654 DBG("Accepting client command ...");
2655
2656 /* Inifinite blocking call, waiting for transmission */
2657 restart:
2658 health_poll_entry();
2659 ret = lttng_poll_wait(&events, -1);
2660 health_poll_exit();
2661 if (ret < 0) {
2662 /*
2663 * Restart interrupted system call.
2664 */
2665 if (errno == EINTR) {
2666 goto restart;
2667 }
2668 goto error;
2669 }
2670
2671 nb_fd = ret;
2672
2673 for (i = 0; i < nb_fd; i++) {
2674 revents = LTTNG_POLL_GETEV(&events, i);
2675 pollfd = LTTNG_POLL_GETFD(&events, i);
2676
2677 health_code_update();
2678
917a718d
JG
2679 if (pollfd == thread_quit_pipe_fd) {
2680 err = 0;
2681 goto exit;
2682 } else {
2683 /* Event on the registration socket */
2684 if (revents & LPOLLIN) {
2685 continue;
2686 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2687 ERR("Client socket poll error");
2688 goto error;
2689 } else {
2690 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2691 goto error;
2692 }
2693 }
2694 }
2695
2696 DBG("Wait for client response");
2697
2698 health_code_update();
2699
2700 sock = lttcomm_accept_unix_sock(client_sock);
2701 if (sock < 0) {
2702 goto error;
2703 }
2704
2705 /*
2706 * Set the CLOEXEC flag. Return code is useless because either way, the
2707 * show must go on.
2708 */
2709 (void) utils_set_fd_cloexec(sock);
2710
2711 /* Set socket option for credentials retrieval */
2712 ret = lttcomm_setsockopt_creds_unix_sock(sock);
2713 if (ret < 0) {
2714 goto error;
2715 }
2716
917a718d
JG
2717 health_code_update();
2718
2719 /*
2720 * Data is received from the lttng client. The struct
2721 * lttcomm_session_msg (lsm) contains the command and data request of
2722 * the client.
2723 */
2724 DBG("Receiving data from client ...");
3a91de3a
JG
2725 ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm,
2726 sizeof(struct lttcomm_session_msg), &cmd_ctx.creds);
2727 if (ret != sizeof(struct lttcomm_session_msg)) {
2728 DBG("Incomplete recv() from client... continuing");
917a718d
JG
2729 ret = close(sock);
2730 if (ret) {
2731 PERROR("close");
2732 }
2733 sock = -1;
917a718d
JG
2734 continue;
2735 }
2736
2737 health_code_update();
2738
2739 // TODO: Validate cmd_ctx including sanity check for
2740 // security purpose.
2741
2742 rcu_thread_online();
2743 /*
2744 * This function dispatch the work to the kernel or userspace tracer
2745 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2746 * informations for the client. The command context struct contains
2747 * everything this function may needs.
2748 */
3a91de3a 2749 ret = process_client_msg(&cmd_ctx, &sock, &sock_error);
917a718d
JG
2750 rcu_thread_offline();
2751 if (ret < 0) {
3e3665b8
JG
2752 if (sock >= 0) {
2753 ret = close(sock);
2754 if (ret) {
2755 PERROR("close");
2756 }
4a76dfd3
JR
2757 }
2758 sock = -1;
917a718d
JG
2759 /*
2760 * TODO: Inform client somehow of the fatal error. At
2761 * this point, ret < 0 means that a zmalloc failed
2762 * (ENOMEM). Error detected but still accept
2763 * command, unless a socket error has been
2764 * detected.
2765 */
917a718d
JG
2766 continue;
2767 }
2768
c7e9ffbd 2769 if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) {
7e397c55
FD
2770 WARN("Command returned an invalid status code, returning unknown error: "
2771 "command type = %s (%d), ret = %d",
7966af57 2772 lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx.lsm.cmd_type),
7e397c55 2773 cmd_ctx.lsm.cmd_type, ret);
c7e9ffbd
JG
2774 ret = LTTNG_ERR_UNK;
2775 }
2776
917a718d
JG
2777 cmd_completion_handler = cmd_pop_completion_handler();
2778 if (cmd_completion_handler) {
2779 enum lttng_error_code completion_code;
2780
2781 completion_code = cmd_completion_handler->run(
2782 cmd_completion_handler->data);
2783 if (completion_code != LTTNG_OK) {
917a718d
JG
2784 continue;
2785 }
2786 }
2787
2788 health_code_update();
2789
3e3665b8 2790 if (sock >= 0) {
3a91de3a
JG
2791 struct lttng_payload_view view =
2792 lttng_payload_view_from_payload(
2793 &cmd_ctx.reply_payload,
2794 0, -1);
e368fb43 2795 struct lttcomm_lttng_msg *llm = (typeof(
3a91de3a
JG
2796 llm)) cmd_ctx.reply_payload.buffer.data;
2797
a0377dfe
FD
2798 LTTNG_ASSERT(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm));
2799 LTTNG_ASSERT(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size);
3a91de3a 2800
fe489250 2801 llm->fd_count = lttng_payload_view_get_fd_handle_count(&view);
e368fb43 2802
3e3665b8 2803 DBG("Sending response (size: %d, retcode: %s (%d))",
3a91de3a
JG
2804 cmd_ctx.lttng_msg_size,
2805 lttng_strerror(-llm->ret_code),
2806 llm->ret_code);
2807 ret = send_unix_sock(sock, &view);
3e3665b8
JG
2808 if (ret < 0) {
2809 ERR("Failed to send data back to client");
2810 }
917a718d 2811
3e3665b8
JG
2812 /* End of transmission */
2813 ret = close(sock);
2814 if (ret) {
2815 PERROR("close");
2816 }
4a76dfd3
JR
2817 }
2818 sock = -1;
917a718d 2819
917a718d
JG
2820 health_code_update();
2821 }
2822
2823exit:
2824error:
2825 if (sock >= 0) {
2826 ret = close(sock);
2827 if (ret) {
2828 PERROR("close");
2829 }
2830 }
2831
2832 lttng_poll_clean(&events);
917a718d
JG
2833
2834error_listen:
2835error_create_poll:
412d7227 2836 unlink(the_config.client_unix_sock_path.value);
0f68efb6
JG
2837 ret = close(client_sock);
2838 if (ret) {
2839 PERROR("close");
917a718d
JG
2840 }
2841
2842 if (err) {
2843 health_error();
2844 ERR("Health error occurred in %s", __func__);
2845 }
2846
412d7227 2847 health_unregister(the_health_sessiond);
917a718d
JG
2848
2849 DBG("Client thread dying");
3a91de3a 2850 lttng_payload_reset(&cmd_ctx.reply_payload);
917a718d 2851 rcu_unregister_thread();
917a718d
JG
2852 return NULL;
2853}
2854
2855static
2856bool shutdown_client_thread(void *thread_data)
2857{
7966af57 2858 struct lttng_pipe *client_quit_pipe = (lttng_pipe *) thread_data;
917a718d
JG
2859 const int write_fd = lttng_pipe_get_writefd(client_quit_pipe);
2860
2861 return notify_thread_pipe(write_fd) == 1;
2862}
2863
2864struct lttng_thread *launch_client_thread(void)
2865{
6cb45e93 2866 bool thread_running;
917a718d 2867 struct lttng_pipe *client_quit_pipe;
0f68efb6
JG
2868 struct lttng_thread *thread = NULL;
2869 int client_sock_fd = -1;
917a718d 2870
6cb45e93 2871 sem_init(&thread_state.ready, 0, 0);
917a718d
JG
2872 client_quit_pipe = lttng_pipe_open(FD_CLOEXEC);
2873 if (!client_quit_pipe) {
2874 goto error;
2875 }
2876
0f68efb6
JG
2877 client_sock_fd = create_client_sock();
2878 if (client_sock_fd < 0) {
2879 goto error;
2880 }
2881
2882 thread_state.client_sock = client_sock_fd;
917a718d
JG
2883 thread = lttng_thread_create("Client management",
2884 thread_manage_clients,
2885 shutdown_client_thread,
2886 cleanup_client_thread,
2887 client_quit_pipe);
2888 if (!thread) {
2889 goto error;
2890 }
0f68efb6
JG
2891 /* The client thread now owns the client sock fd and the quit pipe. */
2892 client_sock_fd = -1;
2893 client_quit_pipe = NULL;
917a718d
JG
2894
2895 /*
2896 * This thread is part of the threads that need to be fully
2897 * initialized before the session daemon is marked as "ready".
2898 */
6cb45e93
JG
2899 thread_running = wait_thread_status();
2900 if (!thread_running) {
0f68efb6 2901 goto error;
6cb45e93 2902 }
917a718d
JG
2903 return thread;
2904error:
0f68efb6
JG
2905 if (client_sock_fd >= 0) {
2906 if (close(client_sock_fd)) {
2907 PERROR("Failed to close client socket");
2908 }
2909 }
2910 lttng_thread_put(thread);
917a718d
JG
2911 cleanup_client_thread(client_quit_pipe);
2912 return NULL;
2913}
This page took 0.178524 seconds and 4 git commands to generate.