Pass the consumerd stream's trace archive id to the relayd
[lttng-tools.git] / src / bin / lttng-relayd / main.c
CommitLineData
b8aa1682
JD
1/*
2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
cd60b05a 4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
7591bab1 5 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
b8aa1682
JD
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License, version 2 only,
9 * as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
6c1c0768 21#define _LGPL_SOURCE
b8aa1682
JD
22#include <getopt.h>
23#include <grp.h>
24#include <limits.h>
25#include <pthread.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/mman.h>
31#include <sys/mount.h>
32#include <sys/resource.h>
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
36#include <sys/wait.h>
173af62f 37#include <inttypes.h>
b8aa1682
JD
38#include <urcu/futex.h>
39#include <urcu/uatomic.h>
40#include <unistd.h>
41#include <fcntl.h>
b8aa1682
JD
42
43#include <lttng/lttng.h>
44#include <common/common.h>
45#include <common/compat/poll.h>
46#include <common/compat/socket.h>
f263b7fd 47#include <common/compat/endian.h>
e8fa9fb0 48#include <common/compat/getenv.h>
b8aa1682 49#include <common/defaults.h>
3fd27398 50#include <common/daemonize.h>
b8aa1682
JD
51#include <common/futex.h>
52#include <common/sessiond-comm/sessiond-comm.h>
53#include <common/sessiond-comm/inet.h>
b8aa1682
JD
54#include <common/sessiond-comm/relayd.h>
55#include <common/uri.h>
a02de639 56#include <common/utils.h>
d3ecc550 57#include <common/align.h>
f40ef1d5 58#include <common/config/session-config.h>
5312a3ed
JG
59#include <common/dynamic-buffer.h>
60#include <common/buffer-view.h>
7591bab1 61#include <urcu/rculist.h>
b8aa1682 62
0f907de1 63#include "cmd.h"
d3e2ba59 64#include "ctf-trace.h"
1c20f0e2 65#include "index.h"
0f907de1 66#include "utils.h"
b8aa1682 67#include "lttng-relayd.h"
d3e2ba59 68#include "live.h"
55706a7d 69#include "health-relayd.h"
9b5e0863 70#include "testpoint.h"
2f8f53af 71#include "viewer-stream.h"
2a174661
DG
72#include "session.h"
73#include "stream.h"
58eb9381 74#include "connection.h"
a44ca2ca 75#include "tracefile-array.h"
f056029c 76#include "tcp_keep_alive.h"
b8aa1682 77
4fc83d94
PP
78static const char *help_msg =
79#ifdef LTTNG_EMBED_HELP
80#include <lttng-relayd.8.h>
81#else
82NULL
83#endif
84;
85
5569b118
JG
86enum relay_connection_status {
87 RELAY_CONNECTION_STATUS_OK,
88 /* An error occured while processing an event on the connection. */
89 RELAY_CONNECTION_STATUS_ERROR,
90 /* Connection closed/shutdown cleanly. */
91 RELAY_CONNECTION_STATUS_CLOSED,
92};
93
b8aa1682 94/* command line options */
0f907de1 95char *opt_output_path;
b5218ffb 96static int opt_daemon, opt_background;
3fd27398
MD
97
98/*
99 * We need to wait for listener and live listener threads, as well as
100 * health check thread, before being ready to signal readiness.
101 */
102#define NR_LTTNG_RELAY_READY 3
103static int lttng_relay_ready = NR_LTTNG_RELAY_READY;
0848dba7
MD
104
105/* Size of receive buffer. */
106#define RECV_DATA_BUFFER_SIZE 65536
d3ecc550 107#define FILE_COPY_BUFFER_SIZE 65536
0848dba7 108
3fd27398
MD
109static int recv_child_signal; /* Set to 1 when a SIGUSR1 signal is received. */
110static pid_t child_ppid; /* Internal parent PID use with daemonize. */
111
095a4ae5
MD
112static struct lttng_uri *control_uri;
113static struct lttng_uri *data_uri;
d3e2ba59 114static struct lttng_uri *live_uri;
b8aa1682
JD
115
116const char *progname;
b8aa1682 117
65931c8b 118const char *tracing_group_name = DEFAULT_TRACING_GROUP;
cd60b05a
JG
119static int tracing_group_name_override;
120
121const char * const config_section_name = "relayd";
65931c8b 122
b8aa1682
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123/*
124 * Quit pipe for all threads. This permits a single cancellation point
125 * for all threads when receiving an event on the pipe.
126 */
0b242f62 127int thread_quit_pipe[2] = { -1, -1 };
b8aa1682
JD
128
129/*
130 * This pipe is used to inform the worker thread that a command is queued and
131 * ready to be processed.
132 */
58eb9381 133static int relay_conn_pipe[2] = { -1, -1 };
b8aa1682 134
26c9d55e 135/* Shared between threads */
b8aa1682
JD
136static int dispatch_thread_exit;
137
138static pthread_t listener_thread;
139static pthread_t dispatcher_thread;
140static pthread_t worker_thread;
65931c8b 141static pthread_t health_thread;
b8aa1682 142
7591bab1
MD
143/*
144 * last_relay_stream_id_lock protects last_relay_stream_id increment
145 * atomicity on 32-bit architectures.
146 */
147static pthread_mutex_t last_relay_stream_id_lock = PTHREAD_MUTEX_INITIALIZER;
095a4ae5 148static uint64_t last_relay_stream_id;
b8aa1682
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149
150/*
151 * Relay command queue.
152 *
153 * The relay_thread_listener and relay_thread_dispatcher communicate with this
154 * queue.
155 */
58eb9381 156static struct relay_conn_queue relay_conn_queue;
b8aa1682 157
d3e2ba59
JD
158/* Global relay stream hash table. */
159struct lttng_ht *relay_streams_ht;
160
92c6ca54
DG
161/* Global relay viewer stream hash table. */
162struct lttng_ht *viewer_streams_ht;
163
7591bab1
MD
164/* Global relay sessions hash table. */
165struct lttng_ht *sessions_ht;
0a6518b0 166
55706a7d 167/* Relayd health monitoring */
eea7556c 168struct health_app *health_relayd;
55706a7d 169
cd60b05a
JG
170static struct option long_options[] = {
171 { "control-port", 1, 0, 'C', },
172 { "data-port", 1, 0, 'D', },
8d5c808e 173 { "live-port", 1, 0, 'L', },
cd60b05a 174 { "daemonize", 0, 0, 'd', },
b5218ffb 175 { "background", 0, 0, 'b', },
cd60b05a
JG
176 { "group", 1, 0, 'g', },
177 { "help", 0, 0, 'h', },
178 { "output", 1, 0, 'o', },
179 { "verbose", 0, 0, 'v', },
180 { "config", 1, 0, 'f' },
3a904098 181 { "version", 0, 0, 'V' },
cd60b05a
JG
182 { NULL, 0, 0, 0, },
183};
184
3a904098 185static const char *config_ignore_options[] = { "help", "config", "version" };
cd60b05a 186
cd60b05a
JG
187/*
188 * Take an option from the getopt output and set it in the right variable to be
189 * used later.
190 *
191 * Return 0 on success else a negative value.
192 */
7591bab1 193static int set_option(int opt, const char *arg, const char *optname)
b8aa1682 194{
cd60b05a
JG
195 int ret;
196
197 switch (opt) {
198 case 0:
199 fprintf(stderr, "option %s", optname);
200 if (arg) {
201 fprintf(stderr, " with arg %s\n", arg);
202 }
203 break;
204 case 'C':
e8fa9fb0
MD
205 if (lttng_is_setuid_setgid()) {
206 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
207 "-C, --control-port");
208 } else {
209 ret = uri_parse(arg, &control_uri);
210 if (ret < 0) {
211 ERR("Invalid control URI specified");
212 goto end;
213 }
214 if (control_uri->port == 0) {
215 control_uri->port = DEFAULT_NETWORK_CONTROL_PORT;
216 }
cd60b05a
JG
217 }
218 break;
219 case 'D':
e8fa9fb0
MD
220 if (lttng_is_setuid_setgid()) {
221 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
222 "-D, -data-port");
223 } else {
224 ret = uri_parse(arg, &data_uri);
225 if (ret < 0) {
226 ERR("Invalid data URI specified");
227 goto end;
228 }
229 if (data_uri->port == 0) {
230 data_uri->port = DEFAULT_NETWORK_DATA_PORT;
231 }
cd60b05a
JG
232 }
233 break;
8d5c808e 234 case 'L':
e8fa9fb0
MD
235 if (lttng_is_setuid_setgid()) {
236 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
237 "-L, -live-port");
238 } else {
239 ret = uri_parse(arg, &live_uri);
240 if (ret < 0) {
241 ERR("Invalid live URI specified");
242 goto end;
243 }
244 if (live_uri->port == 0) {
245 live_uri->port = DEFAULT_NETWORK_VIEWER_PORT;
246 }
8d5c808e
AM
247 }
248 break;
cd60b05a
JG
249 case 'd':
250 opt_daemon = 1;
251 break;
b5218ffb
MD
252 case 'b':
253 opt_background = 1;
254 break;
cd60b05a 255 case 'g':
e8fa9fb0
MD
256 if (lttng_is_setuid_setgid()) {
257 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
258 "-g, --group");
259 } else {
260 tracing_group_name = strdup(arg);
261 if (tracing_group_name == NULL) {
262 ret = -errno;
263 PERROR("strdup");
264 goto end;
265 }
266 tracing_group_name_override = 1;
330a40bb 267 }
cd60b05a
JG
268 break;
269 case 'h':
4fc83d94 270 ret = utils_show_help(8, "lttng-relayd", help_msg);
655b5cc1 271 if (ret) {
4fc83d94 272 ERR("Cannot show --help for `lttng-relayd`");
655b5cc1
PP
273 perror("exec");
274 }
cd60b05a 275 exit(EXIT_FAILURE);
3a904098
AW
276 case 'V':
277 fprintf(stdout, "%s\n", VERSION);
278 exit(EXIT_SUCCESS);
cd60b05a 279 case 'o':
e8fa9fb0
MD
280 if (lttng_is_setuid_setgid()) {
281 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
282 "-o, --output");
283 } else {
284 ret = asprintf(&opt_output_path, "%s", arg);
285 if (ret < 0) {
286 ret = -errno;
287 PERROR("asprintf opt_output_path");
288 goto end;
289 }
cd60b05a
JG
290 }
291 break;
292 case 'v':
293 /* Verbose level can increase using multiple -v */
294 if (arg) {
295 lttng_opt_verbose = config_parse_value(arg);
296 } else {
849e5b7b
DG
297 /* Only 3 level of verbosity (-vvv). */
298 if (lttng_opt_verbose < 3) {
299 lttng_opt_verbose += 1;
300 }
cd60b05a
JG
301 }
302 break;
303 default:
304 /* Unknown option or other error.
305 * Error is printed by getopt, just return */
306 ret = -1;
307 goto end;
308 }
309
310 /* All good. */
311 ret = 0;
312
313end:
314 return ret;
315}
316
317/*
318 * config_entry_handler_cb used to handle options read from a config file.
f40ef1d5 319 * See config_entry_handler_cb comment in common/config/session-config.h for the
cd60b05a
JG
320 * return value conventions.
321 */
7591bab1 322static int config_entry_handler(const struct config_entry *entry, void *unused)
cd60b05a
JG
323{
324 int ret = 0, i;
325
326 if (!entry || !entry->name || !entry->value) {
327 ret = -EINVAL;
328 goto end;
329 }
330
331 /* Check if the option is to be ignored */
332 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
333 if (!strcmp(entry->name, config_ignore_options[i])) {
334 goto end;
335 }
336 }
337
338 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
339 /* Ignore if entry name is not fully matched. */
340 if (strcmp(entry->name, long_options[i].name)) {
341 continue;
342 }
343
344 /*
7591bab1
MD
345 * If the option takes no argument on the command line,
346 * we have to check if the value is "true". We support
347 * non-zero numeric values, true, on and yes.
cd60b05a
JG
348 */
349 if (!long_options[i].has_arg) {
350 ret = config_parse_value(entry->value);
351 if (ret <= 0) {
352 if (ret) {
353 WARN("Invalid configuration value \"%s\" for option %s",
354 entry->value, entry->name);
355 }
356 /* False, skip boolean config option. */
357 goto end;
358 }
359 }
360
361 ret = set_option(long_options[i].val, entry->value, entry->name);
362 goto end;
363 }
364
365 WARN("Unrecognized option \"%s\" in daemon configuration file.",
366 entry->name);
367
368end:
369 return ret;
370}
371
7591bab1 372static int set_options(int argc, char **argv)
cd60b05a 373{
178a0557 374 int c, ret = 0, option_index = 0, retval = 0;
cd60b05a
JG
375 int orig_optopt = optopt, orig_optind = optind;
376 char *default_address, *optstring;
377 const char *config_path = NULL;
378
379 optstring = utils_generate_optstring(long_options,
380 sizeof(long_options) / sizeof(struct option));
381 if (!optstring) {
178a0557 382 retval = -ENOMEM;
cd60b05a
JG
383 goto exit;
384 }
385
386 /* Check for the --config option */
387
388 while ((c = getopt_long(argc, argv, optstring, long_options,
389 &option_index)) != -1) {
390 if (c == '?') {
178a0557 391 retval = -EINVAL;
cd60b05a
JG
392 goto exit;
393 } else if (c != 'f') {
394 continue;
395 }
396
e8fa9fb0
MD
397 if (lttng_is_setuid_setgid()) {
398 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
399 "-f, --config");
400 } else {
401 config_path = utils_expand_path(optarg);
402 if (!config_path) {
403 ERR("Failed to resolve path: %s", optarg);
404 }
cd60b05a
JG
405 }
406 }
407
408 ret = config_get_section_entries(config_path, config_section_name,
409 config_entry_handler, NULL);
410 if (ret) {
411 if (ret > 0) {
412 ERR("Invalid configuration option at line %i", ret);
cd60b05a 413 }
178a0557 414 retval = -1;
cd60b05a
JG
415 goto exit;
416 }
b8aa1682 417
cd60b05a
JG
418 /* Reset getopt's global state */
419 optopt = orig_optopt;
420 optind = orig_optind;
b8aa1682 421 while (1) {
cd60b05a 422 c = getopt_long(argc, argv, optstring, long_options, &option_index);
b8aa1682
JD
423 if (c == -1) {
424 break;
425 }
426
cd60b05a
JG
427 ret = set_option(c, optarg, long_options[option_index].name);
428 if (ret < 0) {
178a0557 429 retval = -1;
b8aa1682
JD
430 goto exit;
431 }
432 }
433
434 /* assign default values */
435 if (control_uri == NULL) {
fa91dc52
MD
436 ret = asprintf(&default_address,
437 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS ":%d",
438 DEFAULT_NETWORK_CONTROL_PORT);
b8aa1682
JD
439 if (ret < 0) {
440 PERROR("asprintf default data address");
178a0557 441 retval = -1;
b8aa1682
JD
442 goto exit;
443 }
444
445 ret = uri_parse(default_address, &control_uri);
446 free(default_address);
447 if (ret < 0) {
448 ERR("Invalid control URI specified");
178a0557 449 retval = -1;
b8aa1682
JD
450 goto exit;
451 }
452 }
453 if (data_uri == NULL) {
fa91dc52
MD
454 ret = asprintf(&default_address,
455 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS ":%d",
456 DEFAULT_NETWORK_DATA_PORT);
b8aa1682
JD
457 if (ret < 0) {
458 PERROR("asprintf default data address");
178a0557 459 retval = -1;
b8aa1682
JD
460 goto exit;
461 }
462
463 ret = uri_parse(default_address, &data_uri);
464 free(default_address);
465 if (ret < 0) {
466 ERR("Invalid data URI specified");
178a0557 467 retval = -1;
b8aa1682
JD
468 goto exit;
469 }
470 }
d3e2ba59 471 if (live_uri == NULL) {
fa91dc52
MD
472 ret = asprintf(&default_address,
473 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS ":%d",
474 DEFAULT_NETWORK_VIEWER_PORT);
d3e2ba59
JD
475 if (ret < 0) {
476 PERROR("asprintf default viewer control address");
178a0557 477 retval = -1;
d3e2ba59
JD
478 goto exit;
479 }
480
481 ret = uri_parse(default_address, &live_uri);
482 free(default_address);
483 if (ret < 0) {
484 ERR("Invalid viewer control URI specified");
178a0557 485 retval = -1;
d3e2ba59
JD
486 goto exit;
487 }
488 }
b8aa1682
JD
489
490exit:
cd60b05a 491 free(optstring);
178a0557 492 return retval;
b8aa1682
JD
493}
494
7591bab1
MD
495static void print_global_objects(void)
496{
497 rcu_register_thread();
498
499 print_viewer_streams();
500 print_relay_streams();
501 print_sessions();
502
503 rcu_unregister_thread();
504}
505
b8aa1682
JD
506/*
507 * Cleanup the daemon
508 */
7591bab1 509static void relayd_cleanup(void)
b8aa1682 510{
7591bab1
MD
511 print_global_objects();
512
b8aa1682
JD
513 DBG("Cleaning up");
514
178a0557
MD
515 if (viewer_streams_ht)
516 lttng_ht_destroy(viewer_streams_ht);
517 if (relay_streams_ht)
518 lttng_ht_destroy(relay_streams_ht);
7591bab1
MD
519 if (sessions_ht)
520 lttng_ht_destroy(sessions_ht);
178a0557 521
095a4ae5
MD
522 /* free the dynamically allocated opt_output_path */
523 free(opt_output_path);
524
a02de639
CB
525 /* Close thread quit pipes */
526 utils_close_pipe(thread_quit_pipe);
527
710c1f73
DG
528 uri_free(control_uri);
529 uri_free(data_uri);
8d5c808e 530 /* Live URI is freed in the live thread. */
cd60b05a
JG
531
532 if (tracing_group_name_override) {
533 free((void *) tracing_group_name);
534 }
b8aa1682
JD
535}
536
537/*
538 * Write to writable pipe used to notify a thread.
539 */
7591bab1 540static int notify_thread_pipe(int wpipe)
b8aa1682 541{
6cd525e8 542 ssize_t ret;
b8aa1682 543
6cd525e8
MD
544 ret = lttng_write(wpipe, "!", 1);
545 if (ret < 1) {
b8aa1682 546 PERROR("write poll pipe");
b4aacfdc 547 goto end;
b8aa1682 548 }
b4aacfdc
MD
549 ret = 0;
550end:
b8aa1682
JD
551 return ret;
552}
553
7591bab1 554static int notify_health_quit_pipe(int *pipe)
65931c8b 555{
6cd525e8 556 ssize_t ret;
65931c8b 557
6cd525e8
MD
558 ret = lttng_write(pipe[1], "4", 1);
559 if (ret < 1) {
65931c8b 560 PERROR("write relay health quit");
b4aacfdc 561 goto end;
65931c8b 562 }
b4aacfdc
MD
563 ret = 0;
564end:
565 return ret;
65931c8b
MD
566}
567
b8aa1682 568/*
b4aacfdc 569 * Stop all relayd and relayd-live threads.
b8aa1682 570 */
b4aacfdc 571int lttng_relay_stop_threads(void)
b8aa1682 572{
b4aacfdc 573 int retval = 0;
b8aa1682
JD
574
575 /* Stopping all threads */
576 DBG("Terminating all threads");
b4aacfdc 577 if (notify_thread_pipe(thread_quit_pipe[1])) {
b8aa1682 578 ERR("write error on thread quit pipe");
b4aacfdc 579 retval = -1;
b8aa1682
JD
580 }
581
b4aacfdc
MD
582 if (notify_health_quit_pipe(health_quit_pipe)) {
583 ERR("write error on health quit pipe");
584 }
65931c8b 585
b8aa1682 586 /* Dispatch thread */
26c9d55e 587 CMM_STORE_SHARED(dispatch_thread_exit, 1);
58eb9381 588 futex_nto1_wake(&relay_conn_queue.futex);
178a0557 589
b4aacfdc 590 if (relayd_live_stop()) {
178a0557 591 ERR("Error stopping live threads");
b4aacfdc 592 retval = -1;
178a0557 593 }
b4aacfdc 594 return retval;
b8aa1682
JD
595}
596
597/*
598 * Signal handler for the daemon
599 *
600 * Simply stop all worker threads, leaving main() return gracefully after
601 * joining all threads and calling cleanup().
602 */
7591bab1 603static void sighandler(int sig)
b8aa1682
JD
604{
605 switch (sig) {
b8aa1682
JD
606 case SIGINT:
607 DBG("SIGINT caught");
b4aacfdc
MD
608 if (lttng_relay_stop_threads()) {
609 ERR("Error stopping threads");
610 }
b8aa1682
JD
611 break;
612 case SIGTERM:
613 DBG("SIGTERM caught");
b4aacfdc
MD
614 if (lttng_relay_stop_threads()) {
615 ERR("Error stopping threads");
616 }
b8aa1682 617 break;
3fd27398
MD
618 case SIGUSR1:
619 CMM_STORE_SHARED(recv_child_signal, 1);
620 break;
b8aa1682
JD
621 default:
622 break;
623 }
624}
625
626/*
627 * Setup signal handler for :
628 * SIGINT, SIGTERM, SIGPIPE
629 */
7591bab1 630static int set_signal_handler(void)
b8aa1682
JD
631{
632 int ret = 0;
633 struct sigaction sa;
634 sigset_t sigset;
635
636 if ((ret = sigemptyset(&sigset)) < 0) {
637 PERROR("sigemptyset");
638 return ret;
639 }
640
b8aa1682
JD
641 sa.sa_mask = sigset;
642 sa.sa_flags = 0;
0072e5e2
MD
643
644 sa.sa_handler = sighandler;
b8aa1682
JD
645 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
646 PERROR("sigaction");
647 return ret;
648 }
649
650 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
651 PERROR("sigaction");
652 return ret;
653 }
654
0072e5e2 655 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
b8aa1682
JD
656 PERROR("sigaction");
657 return ret;
658 }
659
0072e5e2
MD
660 sa.sa_handler = SIG_IGN;
661 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3fd27398
MD
662 PERROR("sigaction");
663 return ret;
664 }
665
666 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
b8aa1682
JD
667
668 return ret;
669}
670
3fd27398
MD
671void lttng_relay_notify_ready(void)
672{
673 /* Notify the parent of the fork() process that we are ready. */
674 if (opt_daemon || opt_background) {
675 if (uatomic_sub_return(&lttng_relay_ready, 1) == 0) {
676 kill(child_ppid, SIGUSR1);
677 }
678 }
679}
680
b8aa1682
JD
681/*
682 * Init thread quit pipe.
683 *
684 * Return -1 on error or 0 if all pipes are created.
685 */
7591bab1 686static int init_thread_quit_pipe(void)
b8aa1682 687{
a02de639 688 int ret;
b8aa1682 689
a02de639 690 ret = utils_create_pipe_cloexec(thread_quit_pipe);
b8aa1682 691
b8aa1682
JD
692 return ret;
693}
694
695/*
696 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
697 */
7591bab1 698static int create_thread_poll_set(struct lttng_poll_event *events, int size)
b8aa1682
JD
699{
700 int ret;
701
702 if (events == NULL || size == 0) {
703 ret = -1;
704 goto error;
705 }
706
707 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
708 if (ret < 0) {
709 goto error;
710 }
711
712 /* Add quit pipe */
c7759e6a 713 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
b8aa1682
JD
714 if (ret < 0) {
715 goto error;
716 }
717
718 return 0;
719
720error:
721 return ret;
722}
723
724/*
725 * Check if the thread quit pipe was triggered.
726 *
727 * Return 1 if it was triggered else 0;
728 */
7591bab1 729static int check_thread_quit_pipe(int fd, uint32_t events)
b8aa1682
JD
730{
731 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
732 return 1;
733 }
734
735 return 0;
736}
737
738/*
739 * Create and init socket from uri.
740 */
7591bab1 741static struct lttcomm_sock *relay_socket_create(struct lttng_uri *uri)
b8aa1682
JD
742{
743 int ret;
744 struct lttcomm_sock *sock = NULL;
745
746 sock = lttcomm_alloc_sock_from_uri(uri);
747 if (sock == NULL) {
748 ERR("Allocating socket");
749 goto error;
750 }
751
752 ret = lttcomm_create_sock(sock);
753 if (ret < 0) {
754 goto error;
755 }
756 DBG("Listening on sock %d", sock->fd);
757
758 ret = sock->ops->bind(sock);
759 if (ret < 0) {
2288467f 760 PERROR("Failed to bind socket");
b8aa1682
JD
761 goto error;
762 }
763
764 ret = sock->ops->listen(sock, -1);
765 if (ret < 0) {
766 goto error;
767
768 }
769
770 return sock;
771
772error:
773 if (sock) {
774 lttcomm_destroy_sock(sock);
775 }
776 return NULL;
777}
778
779/*
780 * This thread manages the listening for new connections on the network
781 */
7591bab1 782static void *relay_thread_listener(void *data)
b8aa1682 783{
095a4ae5 784 int i, ret, pollfd, err = -1;
b8aa1682
JD
785 uint32_t revents, nb_fd;
786 struct lttng_poll_event events;
787 struct lttcomm_sock *control_sock, *data_sock;
788
b8aa1682
JD
789 DBG("[thread] Relay listener started");
790
55706a7d
MD
791 health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
792
f385ae0a
MD
793 health_code_update();
794
7591bab1 795 control_sock = relay_socket_create(control_uri);
b8aa1682 796 if (!control_sock) {
095a4ae5 797 goto error_sock_control;
b8aa1682
JD
798 }
799
7591bab1 800 data_sock = relay_socket_create(data_uri);
b8aa1682 801 if (!data_sock) {
095a4ae5 802 goto error_sock_relay;
b8aa1682
JD
803 }
804
805 /*
7591bab1
MD
806 * Pass 3 as size here for the thread quit pipe, control and
807 * data socket.
b8aa1682
JD
808 */
809 ret = create_thread_poll_set(&events, 3);
810 if (ret < 0) {
811 goto error_create_poll;
812 }
813
814 /* Add the control socket */
815 ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP);
816 if (ret < 0) {
817 goto error_poll_add;
818 }
819
820 /* Add the data socket */
821 ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP);
822 if (ret < 0) {
823 goto error_poll_add;
824 }
825
3fd27398
MD
826 lttng_relay_notify_ready();
827
9b5e0863
MD
828 if (testpoint(relayd_thread_listener)) {
829 goto error_testpoint;
830 }
831
b8aa1682 832 while (1) {
f385ae0a
MD
833 health_code_update();
834
b8aa1682
JD
835 DBG("Listener accepting connections");
836
b8aa1682 837restart:
f385ae0a 838 health_poll_entry();
b8aa1682 839 ret = lttng_poll_wait(&events, -1);
f385ae0a 840 health_poll_exit();
b8aa1682
JD
841 if (ret < 0) {
842 /*
843 * Restart interrupted system call.
844 */
845 if (errno == EINTR) {
846 goto restart;
847 }
848 goto error;
849 }
850
0d9c5d77
DG
851 nb_fd = ret;
852
b8aa1682
JD
853 DBG("Relay new connection received");
854 for (i = 0; i < nb_fd; i++) {
f385ae0a
MD
855 health_code_update();
856
b8aa1682
JD
857 /* Fetch once the poll data */
858 revents = LTTNG_POLL_GETEV(&events, i);
859 pollfd = LTTNG_POLL_GETFD(&events, i);
860
fd20dac9 861 if (!revents) {
7591bab1
MD
862 /*
863 * No activity for this FD (poll
864 * implementation).
865 */
fd20dac9
MD
866 continue;
867 }
868
b8aa1682
JD
869 /* Thread quit pipe has been closed. Killing thread. */
870 ret = check_thread_quit_pipe(pollfd, revents);
871 if (ret) {
095a4ae5
MD
872 err = 0;
873 goto exit;
b8aa1682
JD
874 }
875
03e43155 876 if (revents & LPOLLIN) {
4b7f17b2 877 /*
7591bab1
MD
878 * A new connection is requested, therefore a
879 * sessiond/consumerd connection is allocated in
880 * this thread, enqueued to a global queue and
881 * dequeued (and freed) in the worker thread.
4b7f17b2 882 */
58eb9381
DG
883 int val = 1;
884 struct relay_connection *new_conn;
4b7f17b2 885 struct lttcomm_sock *newsock;
7591bab1 886 enum connection_type type;
b8aa1682
JD
887
888 if (pollfd == data_sock->fd) {
7591bab1 889 type = RELAY_DATA;
b8aa1682 890 newsock = data_sock->ops->accept(data_sock);
58eb9381
DG
891 DBG("Relay data connection accepted, socket %d",
892 newsock->fd);
4b7f17b2
MD
893 } else {
894 assert(pollfd == control_sock->fd);
7591bab1 895 type = RELAY_CONTROL;
b8aa1682 896 newsock = control_sock->ops->accept(control_sock);
58eb9381
DG
897 DBG("Relay control connection accepted, socket %d",
898 newsock->fd);
b8aa1682 899 }
58eb9381
DG
900 if (!newsock) {
901 PERROR("accepting sock");
58eb9381
DG
902 goto error;
903 }
904
905 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
906 sizeof(val));
b8aa1682
JD
907 if (ret < 0) {
908 PERROR("setsockopt inet");
4b7f17b2 909 lttcomm_destroy_sock(newsock);
b8aa1682
JD
910 goto error;
911 }
f056029c
JR
912
913 ret = socket_apply_keep_alive_config(newsock->fd);
914 if (ret < 0) {
915 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
916 newsock->fd);
917 lttcomm_destroy_sock(newsock);
918 goto error;
919 }
920
7591bab1
MD
921 new_conn = connection_create(newsock, type);
922 if (!new_conn) {
923 lttcomm_destroy_sock(newsock);
924 goto error;
925 }
58eb9381
DG
926
927 /* Enqueue request for the dispatcher thread. */
8bdee6e2
SM
928 cds_wfcq_enqueue(&relay_conn_queue.head, &relay_conn_queue.tail,
929 &new_conn->qnode);
b8aa1682
JD
930
931 /*
7591bab1
MD
932 * Wake the dispatch queue futex.
933 * Implicit memory barrier with the
934 * exchange in cds_wfcq_enqueue.
b8aa1682 935 */
58eb9381 936 futex_nto1_wake(&relay_conn_queue.futex);
03e43155
MD
937 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
938 ERR("socket poll error");
939 goto error;
940 } else {
941 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
942 goto error;
b8aa1682
JD
943 }
944 }
945 }
946
095a4ae5 947exit:
b8aa1682
JD
948error:
949error_poll_add:
9b5e0863 950error_testpoint:
b8aa1682
JD
951 lttng_poll_clean(&events);
952error_create_poll:
095a4ae5
MD
953 if (data_sock->fd >= 0) {
954 ret = data_sock->ops->close(data_sock);
b8aa1682
JD
955 if (ret) {
956 PERROR("close");
957 }
b8aa1682 958 }
095a4ae5
MD
959 lttcomm_destroy_sock(data_sock);
960error_sock_relay:
961 if (control_sock->fd >= 0) {
962 ret = control_sock->ops->close(control_sock);
b8aa1682
JD
963 if (ret) {
964 PERROR("close");
965 }
b8aa1682 966 }
095a4ae5
MD
967 lttcomm_destroy_sock(control_sock);
968error_sock_control:
969 if (err) {
f385ae0a
MD
970 health_error();
971 ERR("Health error occurred in %s", __func__);
095a4ae5 972 }
55706a7d 973 health_unregister(health_relayd);
b8aa1682 974 DBG("Relay listener thread cleanup complete");
b4aacfdc 975 lttng_relay_stop_threads();
b8aa1682
JD
976 return NULL;
977}
978
979/*
980 * This thread manages the dispatching of the requests to worker threads
981 */
7591bab1 982static void *relay_thread_dispatcher(void *data)
b8aa1682 983{
6cd525e8
MD
984 int err = -1;
985 ssize_t ret;
8bdee6e2 986 struct cds_wfcq_node *node;
58eb9381 987 struct relay_connection *new_conn = NULL;
b8aa1682
JD
988
989 DBG("[thread] Relay dispatcher started");
990
55706a7d
MD
991 health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER);
992
9b5e0863
MD
993 if (testpoint(relayd_thread_dispatcher)) {
994 goto error_testpoint;
995 }
996
f385ae0a
MD
997 health_code_update();
998
0ed3b1a8 999 for (;;) {
f385ae0a
MD
1000 health_code_update();
1001
b8aa1682 1002 /* Atomically prepare the queue futex */
58eb9381 1003 futex_nto1_prepare(&relay_conn_queue.futex);
b8aa1682 1004
0ed3b1a8
MD
1005 if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
1006 break;
1007 }
1008
b8aa1682 1009 do {
f385ae0a
MD
1010 health_code_update();
1011
b8aa1682 1012 /* Dequeue commands */
8bdee6e2
SM
1013 node = cds_wfcq_dequeue_blocking(&relay_conn_queue.head,
1014 &relay_conn_queue.tail);
b8aa1682
JD
1015 if (node == NULL) {
1016 DBG("Woken up but nothing in the relay command queue");
1017 /* Continue thread execution */
1018 break;
1019 }
58eb9381 1020 new_conn = caa_container_of(node, struct relay_connection, qnode);
b8aa1682 1021
58eb9381 1022 DBG("Dispatching request waiting on sock %d", new_conn->sock->fd);
b8aa1682
JD
1023
1024 /*
7591bab1
MD
1025 * Inform worker thread of the new request. This
1026 * call is blocking so we can be assured that
1027 * the data will be read at some point in time
1028 * or wait to the end of the world :)
b8aa1682 1029 */
58eb9381
DG
1030 ret = lttng_write(relay_conn_pipe[1], &new_conn, sizeof(new_conn));
1031 if (ret < 0) {
1032 PERROR("write connection pipe");
7591bab1 1033 connection_put(new_conn);
b8aa1682
JD
1034 goto error;
1035 }
1036 } while (node != NULL);
1037
1038 /* Futex wait on queue. Blocking call on futex() */
f385ae0a 1039 health_poll_entry();
58eb9381 1040 futex_nto1_wait(&relay_conn_queue.futex);
f385ae0a 1041 health_poll_exit();
b8aa1682
JD
1042 }
1043
f385ae0a
MD
1044 /* Normal exit, no error */
1045 err = 0;
1046
b8aa1682 1047error:
9b5e0863 1048error_testpoint:
f385ae0a
MD
1049 if (err) {
1050 health_error();
1051 ERR("Health error occurred in %s", __func__);
1052 }
55706a7d 1053 health_unregister(health_relayd);
b8aa1682 1054 DBG("Dispatch thread dying");
b4aacfdc 1055 lttng_relay_stop_threads();
b8aa1682
JD
1056 return NULL;
1057}
1058
b8aa1682 1059/*
7591bab1 1060 * Set index data from the control port to a given index object.
b8aa1682 1061 */
7591bab1 1062static int set_index_control_data(struct relay_index *index,
234cd636
JD
1063 struct lttcomm_relayd_index *data,
1064 struct relay_connection *conn)
1c20f0e2 1065{
7591bab1 1066 struct ctf_packet_index index_data;
1c20f0e2
JD
1067
1068 /*
5312a3ed 1069 * The index on disk is encoded in big endian.
1c20f0e2 1070 */
5312a3ed
JG
1071 index_data.packet_size = htobe64(data->packet_size);
1072 index_data.content_size = htobe64(data->content_size);
1073 index_data.timestamp_begin = htobe64(data->timestamp_begin);
1074 index_data.timestamp_end = htobe64(data->timestamp_end);
1075 index_data.events_discarded = htobe64(data->events_discarded);
1076 index_data.stream_id = htobe64(data->stream_id);
234cd636
JD
1077
1078 if (conn->minor >= 8) {
5312a3ed
JG
1079 index->index_data.stream_instance_id = htobe64(data->stream_instance_id);
1080 index->index_data.packet_seq_num = htobe64(data->packet_seq_num);
234cd636
JD
1081 }
1082
7591bab1 1083 return relay_index_set_data(index, &index_data);
1c20f0e2
JD
1084}
1085
c5b6f4f0
DG
1086/*
1087 * Handle the RELAYD_CREATE_SESSION command.
1088 *
1089 * On success, send back the session id or else return a negative value.
1090 */
5312a3ed
JG
1091static int relay_create_session(const struct lttcomm_relayd_hdr *recv_hdr,
1092 struct relay_connection *conn,
1093 const struct lttng_buffer_view *payload)
c5b6f4f0 1094{
5312a3ed
JG
1095 int ret = 0;
1096 ssize_t send_ret;
c5b6f4f0
DG
1097 struct relay_session *session;
1098 struct lttcomm_relayd_status_session reply;
36d2e35d 1099 char session_name[LTTNG_NAME_MAX];
9cf3eb20 1100 char hostname[LTTNG_HOST_NAME_MAX];
7591bab1
MD
1101 uint32_t live_timer = 0;
1102 bool snapshot = false;
c5b6f4f0 1103
36d2e35d 1104 memset(session_name, 0, LTTNG_NAME_MAX);
9cf3eb20 1105 memset(hostname, 0, LTTNG_HOST_NAME_MAX);
c5b6f4f0
DG
1106
1107 memset(&reply, 0, sizeof(reply));
1108
f86f6389
JR
1109 if (conn->minor < 4) {
1110 /* From 2.1 to 2.3 */
1111 ret = 0;
1112 } else if (conn->minor >= 4 && conn->minor < 11) {
1113 /* From 2.4 to 2.10 */
5312a3ed 1114 ret = cmd_create_session_2_4(payload, session_name,
7591bab1 1115 hostname, &live_timer, &snapshot);
f86f6389
JR
1116 } else {
1117 /* From 2.11 to ... */
1118 ret = cmd_create_session_2_11(payload, session_name,
1119 hostname, &live_timer, &snapshot);
7591bab1 1120 }
f86f6389 1121
7591bab1
MD
1122 if (ret < 0) {
1123 goto send_reply;
d3e2ba59
JD
1124 }
1125
7591bab1
MD
1126 session = session_create(session_name, hostname, live_timer,
1127 snapshot, conn->major, conn->minor);
1128 if (!session) {
1129 ret = -1;
1130 goto send_reply;
1131 }
1132 assert(!conn->session);
1133 conn->session = session;
c5b6f4f0
DG
1134 DBG("Created session %" PRIu64, session->id);
1135
7591bab1
MD
1136 reply.session_id = htobe64(session->id);
1137
1138send_reply:
c5b6f4f0
DG
1139 if (ret < 0) {
1140 reply.ret_code = htobe32(LTTNG_ERR_FATAL);
1141 } else {
1142 reply.ret_code = htobe32(LTTNG_OK);
1143 }
1144
58eb9381 1145 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
1146 if (send_ret < (ssize_t) sizeof(reply)) {
1147 ERR("Failed to send \"create session\" command reply (ret = %zd)",
1148 send_ret);
1149 ret = -1;
c5b6f4f0
DG
1150 }
1151
1152 return ret;
1153}
1154
a4baae1b
JD
1155/*
1156 * When we have received all the streams and the metadata for a channel,
1157 * we make them visible to the viewer threads.
1158 */
7591bab1 1159static void publish_connection_local_streams(struct relay_connection *conn)
a4baae1b 1160{
7591bab1
MD
1161 struct relay_stream *stream;
1162 struct relay_session *session = conn->session;
a4baae1b 1163
7591bab1
MD
1164 /*
1165 * We publish all streams belonging to a session atomically wrt
1166 * session lock.
1167 */
1168 pthread_mutex_lock(&session->lock);
1169 rcu_read_lock();
1170 cds_list_for_each_entry_rcu(stream, &session->recv_list,
1171 recv_node) {
1172 stream_publish(stream);
a4baae1b 1173 }
7591bab1 1174 rcu_read_unlock();
a4baae1b 1175
7591bab1
MD
1176 /*
1177 * Inform the viewer that there are new streams in the session.
1178 */
1179 if (session->viewer_attached) {
1180 uatomic_set(&session->new_streams, 1);
1181 }
1182 pthread_mutex_unlock(&session->lock);
a4baae1b
JD
1183}
1184
b8aa1682
JD
1185/*
1186 * relay_add_stream: allocate a new stream for a session
1187 */
5312a3ed
JG
1188static int relay_add_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1189 struct relay_connection *conn,
1190 const struct lttng_buffer_view *payload)
b8aa1682 1191{
7591bab1
MD
1192 int ret;
1193 ssize_t send_ret;
58eb9381 1194 struct relay_session *session = conn->session;
b8aa1682
JD
1195 struct relay_stream *stream = NULL;
1196 struct lttcomm_relayd_status_stream reply;
4030a636 1197 struct ctf_trace *trace = NULL;
7591bab1
MD
1198 uint64_t stream_handle = -1ULL;
1199 char *path_name = NULL, *channel_name = NULL;
1200 uint64_t tracefile_size = 0, tracefile_count = 0;
b8aa1682 1201
5312a3ed 1202 if (!session || !conn->version_check_done) {
b8aa1682
JD
1203 ERR("Trying to add a stream before version check");
1204 ret = -1;
1205 goto end_no_session;
1206 }
1207
2f21a469
JR
1208 if (session->minor == 1) {
1209 /* For 2.1 */
5312a3ed 1210 ret = cmd_recv_stream_2_1(payload, &path_name,
7591bab1 1211 &channel_name);
2f21a469
JR
1212 } else if (session->minor > 1 && session->minor < 11) {
1213 /* From 2.2 to 2.10 */
5312a3ed 1214 ret = cmd_recv_stream_2_2(payload, &path_name,
7591bab1 1215 &channel_name, &tracefile_size, &tracefile_count);
2f21a469
JR
1216 } else {
1217 /* From 2.11 to ... */
1218 ret = cmd_recv_stream_2_11(payload, &path_name,
0b50e4b3
JG
1219 &channel_name, &tracefile_size, &tracefile_count,
1220 &stream_chunk_id.value);
1221 stream_chunk_id.is_set = true;
0f907de1 1222 }
2f21a469 1223
0f907de1 1224 if (ret < 0) {
7591bab1 1225 goto send_reply;
b8aa1682
JD
1226 }
1227
7591bab1 1228 trace = ctf_trace_get_by_path_or_create(session, path_name);
2a174661 1229 if (!trace) {
7591bab1 1230 goto send_reply;
2a174661 1231 }
7591bab1 1232 /* This stream here has one reference on the trace. */
2a174661 1233
7591bab1
MD
1234 pthread_mutex_lock(&last_relay_stream_id_lock);
1235 stream_handle = ++last_relay_stream_id;
1236 pthread_mutex_unlock(&last_relay_stream_id_lock);
d3e2ba59 1237
7591bab1
MD
1238 /* We pass ownership of path_name and channel_name. */
1239 stream = stream_create(trace, stream_handle, path_name,
1240 channel_name, tracefile_size, tracefile_count);
1241 path_name = NULL;
1242 channel_name = NULL;
a4baae1b 1243
2a174661 1244 /*
7591bab1
MD
1245 * Streams are the owners of their trace. Reference to trace is
1246 * kept within stream_create().
2a174661 1247 */
7591bab1 1248 ctf_trace_put(trace);
d3e2ba59 1249
7591bab1 1250send_reply:
53efb85a 1251 memset(&reply, 0, sizeof(reply));
7591bab1
MD
1252 reply.handle = htobe64(stream_handle);
1253 if (!stream) {
f73fabfd 1254 reply.ret_code = htobe32(LTTNG_ERR_UNK);
b8aa1682 1255 } else {
f73fabfd 1256 reply.ret_code = htobe32(LTTNG_OK);
b8aa1682 1257 }
5af40280 1258
58eb9381 1259 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
b8aa1682 1260 sizeof(struct lttcomm_relayd_status_stream), 0);
5312a3ed
JG
1261 if (send_ret < (ssize_t) sizeof(reply)) {
1262 ERR("Failed to send \"add stream\" command reply (ret = %zd)",
1263 send_ret);
1264 ret = -1;
b8aa1682
JD
1265 }
1266
1267end_no_session:
7591bab1
MD
1268 free(path_name);
1269 free(channel_name);
0f907de1 1270 return ret;
b8aa1682
JD
1271}
1272
173af62f
DG
1273/*
1274 * relay_close_stream: close a specific stream
1275 */
5312a3ed
JG
1276static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1277 struct relay_connection *conn,
1278 const struct lttng_buffer_view *payload)
173af62f 1279{
5312a3ed
JG
1280 int ret;
1281 ssize_t send_ret;
58eb9381 1282 struct relay_session *session = conn->session;
173af62f
DG
1283 struct lttcomm_relayd_close_stream stream_info;
1284 struct lttcomm_relayd_generic_reply reply;
1285 struct relay_stream *stream;
173af62f
DG
1286
1287 DBG("Close stream received");
1288
5312a3ed 1289 if (!session || !conn->version_check_done) {
173af62f
DG
1290 ERR("Trying to close a stream before version check");
1291 ret = -1;
1292 goto end_no_session;
1293 }
1294
5312a3ed
JG
1295 if (payload->size < sizeof(stream_info)) {
1296 ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
1297 sizeof(stream_info), payload->size);
173af62f
DG
1298 ret = -1;
1299 goto end_no_session;
1300 }
5312a3ed
JG
1301 memcpy(&stream_info, payload->data, sizeof(stream_info));
1302 stream_info.stream_id = be64toh(stream_info.stream_id);
1303 stream_info.last_net_seq_num = be64toh(stream_info.last_net_seq_num);
173af62f 1304
5312a3ed 1305 stream = stream_get_by_id(stream_info.stream_id);
173af62f
DG
1306 if (!stream) {
1307 ret = -1;
7591bab1 1308 goto end;
173af62f 1309 }
77f7bd85
MD
1310
1311 /*
1312 * Set last_net_seq_num before the close flag. Required by data
1313 * pending check.
1314 */
7591bab1 1315 pthread_mutex_lock(&stream->lock);
5312a3ed 1316 stream->last_net_seq_num = stream_info.last_net_seq_num;
77f7bd85
MD
1317 pthread_mutex_unlock(&stream->lock);
1318
bda7c7b9
JG
1319 /*
1320 * This is one of the conditions which may trigger a stream close
1321 * with the others being:
1322 * 1) A close command is received for a stream
1323 * 2) The control connection owning the stream is closed
1324 * 3) We have received all of the stream's data _after_ a close
1325 * request.
1326 */
1327 try_stream_close(stream);
7591bab1
MD
1328 if (stream->is_metadata) {
1329 struct relay_viewer_stream *vstream;
173af62f 1330
7591bab1
MD
1331 vstream = viewer_stream_get_by_id(stream->stream_handle);
1332 if (vstream) {
1333 if (vstream->metadata_sent == stream->metadata_received) {
1334 /*
1335 * Since all the metadata has been sent to the
1336 * viewer and that we have a request to close
1337 * its stream, we can safely teardown the
1338 * corresponding metadata viewer stream.
1339 */
1340 viewer_stream_put(vstream);
1341 }
1342 /* Put local reference. */
1343 viewer_stream_put(vstream);
1344 }
1345 }
7591bab1 1346 stream_put(stream);
5312a3ed 1347 ret = 0;
173af62f 1348
7591bab1 1349end:
53efb85a 1350 memset(&reply, 0, sizeof(reply));
173af62f 1351 if (ret < 0) {
f73fabfd 1352 reply.ret_code = htobe32(LTTNG_ERR_UNK);
173af62f 1353 } else {
f73fabfd 1354 reply.ret_code = htobe32(LTTNG_OK);
173af62f 1355 }
58eb9381 1356 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
173af62f 1357 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
1358 if (send_ret < (ssize_t) sizeof(reply)) {
1359 ERR("Failed to send \"close stream\" command reply (ret = %zd)",
1360 send_ret);
1361 ret = -1;
173af62f
DG
1362 }
1363
1364end_no_session:
1365 return ret;
1366}
1367
93ec662e
JD
1368/*
1369 * relay_reset_metadata: reset a metadata stream
1370 */
1371static
5312a3ed
JG
1372int relay_reset_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1373 struct relay_connection *conn,
1374 const struct lttng_buffer_view *payload)
93ec662e 1375{
5312a3ed
JG
1376 int ret;
1377 ssize_t send_ret;
93ec662e
JD
1378 struct relay_session *session = conn->session;
1379 struct lttcomm_relayd_reset_metadata stream_info;
1380 struct lttcomm_relayd_generic_reply reply;
1381 struct relay_stream *stream;
1382
1383 DBG("Reset metadata received");
1384
5312a3ed 1385 if (!session || !conn->version_check_done) {
93ec662e
JD
1386 ERR("Trying to reset a metadata stream before version check");
1387 ret = -1;
1388 goto end_no_session;
1389 }
1390
5312a3ed
JG
1391 if (payload->size < sizeof(stream_info)) {
1392 ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
1393 sizeof(stream_info), payload->size);
93ec662e
JD
1394 ret = -1;
1395 goto end_no_session;
1396 }
5312a3ed
JG
1397 memcpy(&stream_info, payload->data, sizeof(stream_info));
1398 stream_info.stream_id = be64toh(stream_info.stream_id);
1399 stream_info.version = be64toh(stream_info.version);
1400
1401 DBG("Update metadata to version %" PRIu64, stream_info.version);
93ec662e
JD
1402
1403 /* Unsupported for live sessions for now. */
1404 if (session->live_timer != 0) {
1405 ret = -1;
1406 goto end;
1407 }
1408
5312a3ed 1409 stream = stream_get_by_id(stream_info.stream_id);
93ec662e
JD
1410 if (!stream) {
1411 ret = -1;
1412 goto end;
1413 }
1414 pthread_mutex_lock(&stream->lock);
1415 if (!stream->is_metadata) {
1416 ret = -1;
1417 goto end_unlock;
1418 }
1419
1420 ret = utils_rotate_stream_file(stream->path_name, stream->channel_name,
1421 0, 0, -1, -1, stream->stream_fd->fd, NULL,
1422 &stream->stream_fd->fd);
1423 if (ret < 0) {
1424 ERR("Failed to rotate metadata file %s of channel %s",
1425 stream->path_name, stream->channel_name);
1426 goto end_unlock;
1427 }
1428
1429end_unlock:
1430 pthread_mutex_unlock(&stream->lock);
1431 stream_put(stream);
1432
1433end:
1434 memset(&reply, 0, sizeof(reply));
1435 if (ret < 0) {
1436 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1437 } else {
1438 reply.ret_code = htobe32(LTTNG_OK);
1439 }
1440 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1441 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
1442 if (send_ret < (ssize_t) sizeof(reply)) {
1443 ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
1444 send_ret);
1445 ret = -1;
93ec662e
JD
1446 }
1447
1448end_no_session:
1449 return ret;
1450}
1451
b8aa1682
JD
1452/*
1453 * relay_unknown_command: send -1 if received unknown command
1454 */
7591bab1 1455static void relay_unknown_command(struct relay_connection *conn)
b8aa1682
JD
1456{
1457 struct lttcomm_relayd_generic_reply reply;
5312a3ed 1458 ssize_t send_ret;
b8aa1682 1459
53efb85a 1460 memset(&reply, 0, sizeof(reply));
f73fabfd 1461 reply.ret_code = htobe32(LTTNG_ERR_UNK);
5312a3ed
JG
1462 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1463 if (send_ret < sizeof(reply)) {
1464 ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret);
b8aa1682
JD
1465 }
1466}
1467
1468/*
1469 * relay_start: send an acknowledgment to the client to tell if we are
1470 * ready to receive data. We are ready if a session is established.
1471 */
5312a3ed
JG
1472static int relay_start(const struct lttcomm_relayd_hdr *recv_hdr,
1473 struct relay_connection *conn,
1474 const struct lttng_buffer_view *payload)
b8aa1682 1475{
5312a3ed
JG
1476 int ret = 0;
1477 ssize_t send_ret;
b8aa1682 1478 struct lttcomm_relayd_generic_reply reply;
58eb9381 1479 struct relay_session *session = conn->session;
b8aa1682
JD
1480
1481 if (!session) {
1482 DBG("Trying to start the streaming without a session established");
f73fabfd 1483 ret = htobe32(LTTNG_ERR_UNK);
b8aa1682
JD
1484 }
1485
53efb85a 1486 memset(&reply, 0, sizeof(reply));
5312a3ed
JG
1487 reply.ret_code = htobe32(LTTNG_OK);
1488 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1489 sizeof(reply), 0);
1490 if (send_ret < (ssize_t) sizeof(reply)) {
1491 ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
1492 send_ret);
1493 ret = -1;
b8aa1682
JD
1494 }
1495
1496 return ret;
1497}
1498
1d4dfdef
DG
1499/*
1500 * Append padding to the file pointed by the file descriptor fd.
1501 */
1502static int write_padding_to_file(int fd, uint32_t size)
1503{
6cd525e8 1504 ssize_t ret = 0;
1d4dfdef
DG
1505 char *zeros;
1506
1507 if (size == 0) {
1508 goto end;
1509 }
1510
1511 zeros = zmalloc(size);
1512 if (zeros == NULL) {
1513 PERROR("zmalloc zeros for padding");
1514 ret = -1;
1515 goto end;
1516 }
1517
6cd525e8
MD
1518 ret = lttng_write(fd, zeros, size);
1519 if (ret < size) {
1d4dfdef
DG
1520 PERROR("write padding to file");
1521 }
1522
e986c7a1
DG
1523 free(zeros);
1524
1d4dfdef
DG
1525end:
1526 return ret;
1527}
1528
d3ecc550
JD
1529/*
1530 * Close the current index file if it is open, and create a new one.
1531 *
1532 * Return 0 on success, -1 on error.
1533 */
1534static
1535int create_rotate_index_file(struct relay_stream *stream)
1536{
1537 int ret;
1538 uint32_t major, minor;
1539
1540 /* Put ref on previous index_file. */
1541 if (stream->index_file) {
1542 lttng_index_file_put(stream->index_file);
1543 stream->index_file = NULL;
1544 }
1545 major = stream->trace->session->major;
1546 minor = stream->trace->session->minor;
1547 stream->index_file = lttng_index_file_create(stream->path_name,
1548 stream->channel_name,
1549 -1, -1, stream->tracefile_size,
1550 tracefile_array_get_file_index_head(stream->tfa),
1551 lttng_to_index_major(major, minor),
1552 lttng_to_index_minor(major, minor));
1553 if (!stream->index_file) {
1554 ret = -1;
1555 goto end;
1556 }
1557
1558 ret = 0;
1559
1560end:
1561 return ret;
1562}
1563
1564static
1565int do_rotate_stream(struct relay_stream *stream)
1566{
1567 int ret;
1568
1569 /* Perform the stream rotation. */
1570 ret = utils_rotate_stream_file(stream->path_name,
1571 stream->channel_name, stream->tracefile_size,
1572 stream->tracefile_count, -1,
1573 -1, stream->stream_fd->fd,
1574 NULL, &stream->stream_fd->fd);
1575 if (ret < 0) {
1576 ERR("Rotating stream output file");
1577 goto end;
1578 }
1579 stream->tracefile_size_current = 0;
1580
1581 /* Rotate also the index if the stream is not a metadata stream. */
1582 if (!stream->is_metadata) {
1583 ret = create_rotate_index_file(stream);
1584 if (ret < 0) {
1585 ERR("Failed to rotate index file");
1586 goto end;
1587 }
1588 }
1589
1590 stream->rotate_at_seq_num = -1ULL;
1591 stream->pos_after_last_complete_data_index = 0;
1592
1593end:
1594 return ret;
1595}
1596
1597/*
1598 * If too much data has been written in a tracefile before we received the
1599 * rotation command, we have to move the excess data to the new tracefile and
1600 * perform the rotation. This can happen because the control and data
1601 * connections are separate, the indexes as well as the commands arrive from
1602 * the control connection and we have no control over the order so we could be
1603 * in a situation where too much data has been received on the data connection
1604 * before the rotation command on the control connection arrives. We don't need
1605 * to update the index because its order is guaranteed with the rotation
1606 * command message.
1607 */
1608static
1609int rotate_truncate_stream(struct relay_stream *stream)
1610{
1611 int ret, new_fd;
a5df8828 1612 off_t lseek_ret;
d3ecc550
JD
1613 uint64_t diff, pos = 0;
1614 char buf[FILE_COPY_BUFFER_SIZE];
1615
1616 assert(!stream->is_metadata);
1617
1618 assert(stream->tracefile_size_current >
1619 stream->pos_after_last_complete_data_index);
1620 diff = stream->tracefile_size_current -
1621 stream->pos_after_last_complete_data_index;
1622
1623 /* Create the new tracefile. */
1624 new_fd = utils_create_stream_file(stream->path_name,
1625 stream->channel_name,
1626 stream->tracefile_size, stream->tracefile_count,
1627 /* uid */ -1, /* gid */ -1, /* suffix */ NULL);
1628 if (new_fd < 0) {
1629 ERR("Failed to create new stream file at path %s for channel %s",
1630 stream->path_name, stream->channel_name);
1631 ret = -1;
1632 goto end;
1633 }
1634
1635 /*
1636 * Rewind the current tracefile to the position at which the rotation
1637 * should have occured.
1638 */
a5df8828 1639 lseek_ret = lseek(stream->stream_fd->fd,
d3ecc550 1640 stream->pos_after_last_complete_data_index, SEEK_SET);
a5df8828 1641 if (lseek_ret < 0) {
d3ecc550 1642 PERROR("seek truncate stream");
a5df8828 1643 ret = -1;
d3ecc550
JD
1644 goto end;
1645 }
1646
1647 /* Move data from the old file to the new file. */
1648 while (pos < diff) {
1649 uint64_t count, bytes_left;
1650 ssize_t io_ret;
1651
1652 bytes_left = diff - pos;
1653 count = bytes_left > sizeof(buf) ? sizeof(buf) : bytes_left;
1654 assert(count <= SIZE_MAX);
1655
1656 io_ret = lttng_read(stream->stream_fd->fd, buf, count);
1657 if (io_ret < (ssize_t) count) {
1658 char error_string[256];
1659
1660 snprintf(error_string, sizeof(error_string),
1661 "Failed to read %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1662 count, stream->stream_fd->fd, io_ret);
1663 if (io_ret == -1) {
1664 PERROR("%s", error_string);
1665 } else {
1666 ERR("%s", error_string);
1667 }
1668 ret = -1;
1669 goto end;
1670 }
1671
1672 io_ret = lttng_write(new_fd, buf, count);
1673 if (io_ret < (ssize_t) count) {
1674 char error_string[256];
1675
1676 snprintf(error_string, sizeof(error_string),
1677 "Failed to write %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1678 count, new_fd, io_ret);
1679 if (io_ret == -1) {
1680 PERROR("%s", error_string);
1681 } else {
1682 ERR("%s", error_string);
1683 }
1684 ret = -1;
1685 goto end;
1686 }
1687
1688 pos += count;
1689 }
1690
1691 /* Truncate the file to get rid of the excess data. */
1692 ret = ftruncate(stream->stream_fd->fd,
1693 stream->pos_after_last_complete_data_index);
1694 if (ret) {
1695 PERROR("ftruncate");
1696 goto end;
1697 }
1698
1699 ret = close(stream->stream_fd->fd);
1700 if (ret < 0) {
1701 PERROR("Closing tracefile");
1702 goto end;
1703 }
1704
1705 ret = create_rotate_index_file(stream);
1706 if (ret < 0) {
1707 ERR("Rotate stream index file");
1708 goto end;
1709 }
1710
1711 /*
1712 * Update the offset and FD of all the eventual indexes created by the
1713 * data connection before the rotation command arrived.
1714 */
1715 ret = relay_index_switch_all_files(stream);
1716 if (ret < 0) {
1717 ERR("Failed to rotate index file");
1718 goto end;
1719 }
1720
1721 stream->stream_fd->fd = new_fd;
1722 stream->tracefile_size_current = diff;
1723 stream->pos_after_last_complete_data_index = 0;
1724 stream->rotate_at_seq_num = -1ULL;
1725
1726 ret = 0;
1727
1728end:
1729 return ret;
1730}
1731
1732/*
1733 * Check if a stream should perform a rotation (for session rotation).
1734 * Must be called with the stream lock held.
1735 *
1736 * Return 0 on success, a negative value on error.
1737 */
1738static
1739int try_rotate_stream(struct relay_stream *stream)
1740{
1741 int ret = 0;
1742
1743 /* No rotation expected. */
1744 if (stream->rotate_at_seq_num == -1ULL) {
1745 goto end;
1746 }
1747
3765c8cc
JG
1748 if (stream->prev_seq < stream->rotate_at_seq_num ||
1749 stream->prev_seq == -1ULL) {
d3ecc550
JD
1750 DBG("Stream %" PRIu64 " no yet ready for rotation",
1751 stream->stream_handle);
1752 goto end;
1753 } else if (stream->prev_seq > stream->rotate_at_seq_num) {
1754 DBG("Rotation after too much data has been written in tracefile "
1755 "for stream %" PRIu64 ", need to truncate before "
1756 "rotating", stream->stream_handle);
1757 ret = rotate_truncate_stream(stream);
1758 if (ret) {
1759 ERR("Failed to truncate stream");
1760 goto end;
1761 }
1762 } else {
1763 /* stream->prev_seq == stream->rotate_at_seq_num */
1764 DBG("Stream %" PRIu64 " ready for rotation",
1765 stream->stream_handle);
1766 ret = do_rotate_stream(stream);
1767 }
1768
1769end:
1770 return ret;
1771}
1772
b8aa1682 1773/*
7591bab1 1774 * relay_recv_metadata: receive the metadata for the session.
b8aa1682 1775 */
5312a3ed
JG
1776static int relay_recv_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1777 struct relay_connection *conn,
1778 const struct lttng_buffer_view *payload)
b8aa1682 1779{
32d1569c 1780 int ret = 0;
6cd525e8 1781 ssize_t size_ret;
58eb9381 1782 struct relay_session *session = conn->session;
5312a3ed 1783 struct lttcomm_relayd_metadata_payload metadata_payload_header;
b8aa1682 1784 struct relay_stream *metadata_stream;
5312a3ed 1785 uint64_t metadata_payload_size;
b8aa1682
JD
1786
1787 if (!session) {
1788 ERR("Metadata sent before version check");
1789 ret = -1;
1790 goto end;
1791 }
1792
5312a3ed 1793 if (recv_hdr->data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
f6416125
MD
1794 ERR("Incorrect data size");
1795 ret = -1;
1796 goto end;
1797 }
5312a3ed
JG
1798 metadata_payload_size = recv_hdr->data_size -
1799 sizeof(struct lttcomm_relayd_metadata_payload);
f6416125 1800
5312a3ed
JG
1801 memcpy(&metadata_payload_header, payload->data,
1802 sizeof(metadata_payload_header));
1803 metadata_payload_header.stream_id = be64toh(
1804 metadata_payload_header.stream_id);
1805 metadata_payload_header.padding_size = be32toh(
1806 metadata_payload_header.padding_size);
9d1bbf21 1807
5312a3ed 1808 metadata_stream = stream_get_by_id(metadata_payload_header.stream_id);
b8aa1682
JD
1809 if (!metadata_stream) {
1810 ret = -1;
7591bab1 1811 goto end;
b8aa1682
JD
1812 }
1813
7591bab1
MD
1814 pthread_mutex_lock(&metadata_stream->lock);
1815
5312a3ed
JG
1816 size_ret = lttng_write(metadata_stream->stream_fd->fd,
1817 payload->data + sizeof(metadata_payload_header),
1818 metadata_payload_size);
1819 if (size_ret < metadata_payload_size) {
b8aa1682
JD
1820 ERR("Relay error writing metadata on file");
1821 ret = -1;
7591bab1 1822 goto end_put;
b8aa1682 1823 }
1d4dfdef 1824
32d1569c 1825 size_ret = write_padding_to_file(metadata_stream->stream_fd->fd,
5312a3ed 1826 metadata_payload_header.padding_size);
715e6fb1 1827 if (size_ret < (int64_t) metadata_payload_header.padding_size) {
5312a3ed 1828 ret = -1;
7591bab1 1829 goto end_put;
1d4dfdef 1830 }
2a174661 1831
7591bab1 1832 metadata_stream->metadata_received +=
5312a3ed 1833 metadata_payload_size + metadata_payload_header.padding_size;
7591bab1
MD
1834 DBG2("Relay metadata written. Updated metadata_received %" PRIu64,
1835 metadata_stream->metadata_received);
1d4dfdef 1836
d3ecc550
JD
1837 ret = try_rotate_stream(metadata_stream);
1838 if (ret < 0) {
1839 goto end_put;
1840 }
1841
7591bab1
MD
1842end_put:
1843 pthread_mutex_unlock(&metadata_stream->lock);
1844 stream_put(metadata_stream);
b8aa1682
JD
1845end:
1846 return ret;
1847}
1848
1849/*
1850 * relay_send_version: send relayd version number
1851 */
5312a3ed
JG
1852static int relay_send_version(const struct lttcomm_relayd_hdr *recv_hdr,
1853 struct relay_connection *conn,
1854 const struct lttng_buffer_view *payload)
b8aa1682 1855{
7f51dcba 1856 int ret;
5312a3ed 1857 ssize_t send_ret;
092b6259 1858 struct lttcomm_relayd_version reply, msg;
87cb6359 1859 bool compatible = true;
b8aa1682 1860
5312a3ed 1861 conn->version_check_done = true;
b8aa1682 1862
092b6259 1863 /* Get version from the other side. */
5312a3ed
JG
1864 if (payload->size < sizeof(msg)) {
1865 ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
1866 sizeof(msg), payload->size);
092b6259 1867 ret = -1;
092b6259
DG
1868 goto end;
1869 }
1870
5312a3ed
JG
1871 memcpy(&msg, payload->data, sizeof(msg));
1872 msg.major = be32toh(msg.major);
1873 msg.minor = be32toh(msg.minor);
1874
53efb85a 1875 memset(&reply, 0, sizeof(reply));
d83a952c
MD
1876 reply.major = RELAYD_VERSION_COMM_MAJOR;
1877 reply.minor = RELAYD_VERSION_COMM_MINOR;
d4519fa3
JD
1878
1879 /* Major versions must be the same */
5312a3ed 1880 if (reply.major != msg.major) {
6151a90f 1881 DBG("Incompatible major versions (%u vs %u), deleting session",
5312a3ed 1882 reply.major, msg.major);
87cb6359 1883 compatible = false;
d4519fa3
JD
1884 }
1885
58eb9381 1886 conn->major = reply.major;
0f907de1 1887 /* We adapt to the lowest compatible version */
5312a3ed 1888 if (reply.minor <= msg.minor) {
58eb9381 1889 conn->minor = reply.minor;
0f907de1 1890 } else {
5312a3ed 1891 conn->minor = msg.minor;
0f907de1
JD
1892 }
1893
6151a90f
JD
1894 reply.major = htobe32(reply.major);
1895 reply.minor = htobe32(reply.minor);
5312a3ed
JG
1896 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1897 sizeof(reply), 0);
1898 if (send_ret < (ssize_t) sizeof(reply)) {
1899 ERR("Failed to send \"send version\" command reply (ret = %zd)",
1900 send_ret);
1901 ret = -1;
1902 goto end;
1903 } else {
1904 ret = 0;
6151a90f
JD
1905 }
1906
87cb6359
JD
1907 if (!compatible) {
1908 ret = -1;
1909 goto end;
1910 }
1911
58eb9381
DG
1912 DBG("Version check done using protocol %u.%u", conn->major,
1913 conn->minor);
b8aa1682
JD
1914
1915end:
1916 return ret;
1917}
1918
c8f59ee5 1919/*
6d805429 1920 * Check for data pending for a given stream id from the session daemon.
c8f59ee5 1921 */
5312a3ed
JG
1922static int relay_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
1923 struct relay_connection *conn,
1924 const struct lttng_buffer_view *payload)
c8f59ee5 1925{
58eb9381 1926 struct relay_session *session = conn->session;
6d805429 1927 struct lttcomm_relayd_data_pending msg;
c8f59ee5
DG
1928 struct lttcomm_relayd_generic_reply reply;
1929 struct relay_stream *stream;
5312a3ed 1930 ssize_t send_ret;
c8f59ee5 1931 int ret;
c8f59ee5 1932
6d805429 1933 DBG("Data pending command received");
c8f59ee5 1934
5312a3ed 1935 if (!session || !conn->version_check_done) {
c8f59ee5
DG
1936 ERR("Trying to check for data before version check");
1937 ret = -1;
1938 goto end_no_session;
1939 }
1940
5312a3ed
JG
1941 if (payload->size < sizeof(msg)) {
1942 ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
1943 sizeof(msg), payload->size);
c8f59ee5
DG
1944 ret = -1;
1945 goto end_no_session;
1946 }
5312a3ed
JG
1947 memcpy(&msg, payload->data, sizeof(msg));
1948 msg.stream_id = be64toh(msg.stream_id);
1949 msg.last_net_seq_num = be64toh(msg.last_net_seq_num);
c8f59ee5 1950
5312a3ed 1951 stream = stream_get_by_id(msg.stream_id);
de91f48a 1952 if (stream == NULL) {
c8f59ee5 1953 ret = -1;
7591bab1 1954 goto end;
c8f59ee5
DG
1955 }
1956
7591bab1
MD
1957 pthread_mutex_lock(&stream->lock);
1958
6d805429 1959 DBG("Data pending for stream id %" PRIu64 " prev_seq %" PRIu64
5312a3ed
JG
1960 " and last_seq %" PRIu64, msg.stream_id,
1961 stream->prev_seq, msg.last_net_seq_num);
c8f59ee5 1962
33832e64 1963 /* Avoid wrapping issue */
5312a3ed 1964 if (((int64_t) (stream->prev_seq - msg.last_net_seq_num)) >= 0) {
6d805429 1965 /* Data has in fact been written and is NOT pending */
c8f59ee5 1966 ret = 0;
6d805429
DG
1967 } else {
1968 /* Data still being streamed thus pending */
1969 ret = 1;
c8f59ee5
DG
1970 }
1971
7591bab1
MD
1972 stream->data_pending_check_done = true;
1973 pthread_mutex_unlock(&stream->lock);
f7079f67 1974
7591bab1
MD
1975 stream_put(stream);
1976end:
c8f59ee5 1977
53efb85a 1978 memset(&reply, 0, sizeof(reply));
c8f59ee5 1979 reply.ret_code = htobe32(ret);
5312a3ed
JG
1980 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1981 if (send_ret < (ssize_t) sizeof(reply)) {
1982 ERR("Failed to send \"data pending\" command reply (ret = %zd)",
1983 send_ret);
1984 ret = -1;
c8f59ee5
DG
1985 }
1986
1987end_no_session:
1988 return ret;
1989}
1990
1991/*
1992 * Wait for the control socket to reach a quiescent state.
1993 *
7591bab1
MD
1994 * Note that for now, when receiving this command from the session
1995 * daemon, this means that every subsequent commands or data received on
1996 * the control socket has been handled. So, this is why we simply return
1997 * OK here.
c8f59ee5 1998 */
5312a3ed
JG
1999static int relay_quiescent_control(const struct lttcomm_relayd_hdr *recv_hdr,
2000 struct relay_connection *conn,
2001 const struct lttng_buffer_view *payload)
c8f59ee5
DG
2002{
2003 int ret;
5312a3ed 2004 ssize_t send_ret;
ad7051c0 2005 struct relay_stream *stream;
ad7051c0 2006 struct lttcomm_relayd_quiescent_control msg;
c8f59ee5
DG
2007 struct lttcomm_relayd_generic_reply reply;
2008
2009 DBG("Checking quiescent state on control socket");
2010
5312a3ed 2011 if (!conn->session || !conn->version_check_done) {
ad7051c0
DG
2012 ERR("Trying to check for data before version check");
2013 ret = -1;
2014 goto end_no_session;
2015 }
2016
5312a3ed
JG
2017 if (payload->size < sizeof(msg)) {
2018 ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
2019 sizeof(msg), payload->size);
ad7051c0
DG
2020 ret = -1;
2021 goto end_no_session;
2022 }
5312a3ed
JG
2023 memcpy(&msg, payload->data, sizeof(msg));
2024 msg.stream_id = be64toh(msg.stream_id);
ad7051c0 2025
5312a3ed 2026 stream = stream_get_by_id(msg.stream_id);
7591bab1
MD
2027 if (!stream) {
2028 goto reply;
2029 }
2030 pthread_mutex_lock(&stream->lock);
2031 stream->data_pending_check_done = true;
2032 pthread_mutex_unlock(&stream->lock);
5312a3ed
JG
2033
2034 DBG("Relay quiescent control pending flag set to %" PRIu64, msg.stream_id);
7591bab1
MD
2035 stream_put(stream);
2036reply:
53efb85a 2037 memset(&reply, 0, sizeof(reply));
c8f59ee5 2038 reply.ret_code = htobe32(LTTNG_OK);
5312a3ed
JG
2039 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2040 if (send_ret < (ssize_t) sizeof(reply)) {
2041 ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
2042 send_ret);
2043 ret = -1;
2044 } else {
2045 ret = 0;
c8f59ee5
DG
2046 }
2047
ad7051c0 2048end_no_session:
c8f59ee5
DG
2049 return ret;
2050}
2051
f7079f67 2052/*
7591bab1
MD
2053 * Initialize a data pending command. This means that a consumer is about
2054 * to ask for data pending for each stream it holds. Simply iterate over
2055 * all streams of a session and set the data_pending_check_done flag.
f7079f67
DG
2056 *
2057 * This command returns to the client a LTTNG_OK code.
2058 */
5312a3ed
JG
2059static int relay_begin_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2060 struct relay_connection *conn,
2061 const struct lttng_buffer_view *payload)
f7079f67
DG
2062{
2063 int ret;
5312a3ed 2064 ssize_t send_ret;
f7079f67
DG
2065 struct lttng_ht_iter iter;
2066 struct lttcomm_relayd_begin_data_pending msg;
2067 struct lttcomm_relayd_generic_reply reply;
2068 struct relay_stream *stream;
f7079f67
DG
2069
2070 assert(recv_hdr);
58eb9381 2071 assert(conn);
f7079f67
DG
2072
2073 DBG("Init streams for data pending");
2074
5312a3ed 2075 if (!conn->session || !conn->version_check_done) {
f7079f67
DG
2076 ERR("Trying to check for data before version check");
2077 ret = -1;
2078 goto end_no_session;
2079 }
2080
5312a3ed
JG
2081 if (payload->size < sizeof(msg)) {
2082 ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
2083 sizeof(msg), payload->size);
f7079f67
DG
2084 ret = -1;
2085 goto end_no_session;
2086 }
5312a3ed
JG
2087 memcpy(&msg, payload->data, sizeof(msg));
2088 msg.session_id = be64toh(msg.session_id);
f7079f67
DG
2089
2090 /*
7591bab1
MD
2091 * Iterate over all streams to set the begin data pending flag.
2092 * For now, the streams are indexed by stream handle so we have
2093 * to iterate over all streams to find the one associated with
2094 * the right session_id.
f7079f67
DG
2095 */
2096 rcu_read_lock();
d3e2ba59 2097 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2098 node.node) {
7591bab1
MD
2099 if (!stream_get(stream)) {
2100 continue;
2101 }
5312a3ed 2102 if (stream->trace->session->id == msg.session_id) {
7591bab1
MD
2103 pthread_mutex_lock(&stream->lock);
2104 stream->data_pending_check_done = false;
2105 pthread_mutex_unlock(&stream->lock);
f7079f67
DG
2106 DBG("Set begin data pending flag to stream %" PRIu64,
2107 stream->stream_handle);
2108 }
7591bab1 2109 stream_put(stream);
f7079f67
DG
2110 }
2111 rcu_read_unlock();
2112
53efb85a 2113 memset(&reply, 0, sizeof(reply));
f7079f67
DG
2114 /* All good, send back reply. */
2115 reply.ret_code = htobe32(LTTNG_OK);
2116
5312a3ed
JG
2117 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2118 if (send_ret < (ssize_t) sizeof(reply)) {
2119 ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
2120 send_ret);
2121 ret = -1;
2122 } else {
2123 ret = 0;
f7079f67
DG
2124 }
2125
2126end_no_session:
2127 return ret;
2128}
2129
2130/*
7591bab1
MD
2131 * End data pending command. This will check, for a given session id, if
2132 * each stream associated with it has its data_pending_check_done flag
2133 * set. If not, this means that the client lost track of the stream but
2134 * the data is still being streamed on our side. In this case, we inform
2135 * the client that data is in flight.
f7079f67
DG
2136 *
2137 * Return to the client if there is data in flight or not with a ret_code.
2138 */
5312a3ed
JG
2139static int relay_end_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2140 struct relay_connection *conn,
2141 const struct lttng_buffer_view *payload)
f7079f67
DG
2142{
2143 int ret;
5312a3ed 2144 ssize_t send_ret;
f7079f67
DG
2145 struct lttng_ht_iter iter;
2146 struct lttcomm_relayd_end_data_pending msg;
2147 struct lttcomm_relayd_generic_reply reply;
2148 struct relay_stream *stream;
f7079f67
DG
2149 uint32_t is_data_inflight = 0;
2150
f7079f67
DG
2151 DBG("End data pending command");
2152
5312a3ed 2153 if (!conn->session || !conn->version_check_done) {
f7079f67
DG
2154 ERR("Trying to check for data before version check");
2155 ret = -1;
2156 goto end_no_session;
2157 }
2158
5312a3ed
JG
2159 if (payload->size < sizeof(msg)) {
2160 ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
2161 sizeof(msg), payload->size);
f7079f67
DG
2162 ret = -1;
2163 goto end_no_session;
2164 }
5312a3ed
JG
2165 memcpy(&msg, payload->data, sizeof(msg));
2166 msg.session_id = be64toh(msg.session_id);
f7079f67 2167
7591bab1
MD
2168 /*
2169 * Iterate over all streams to see if the begin data pending
2170 * flag is set.
2171 */
f7079f67 2172 rcu_read_lock();
d3e2ba59 2173 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2174 node.node) {
7591bab1
MD
2175 if (!stream_get(stream)) {
2176 continue;
2177 }
5312a3ed 2178 if (stream->trace->session->id != msg.session_id) {
7591bab1
MD
2179 stream_put(stream);
2180 continue;
2181 }
2182 pthread_mutex_lock(&stream->lock);
2183 if (!stream->data_pending_check_done) {
2184 if (!stream->closed || !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) {
2185 is_data_inflight = 1;
2186 DBG("Data is still in flight for stream %" PRIu64,
2187 stream->stream_handle);
2188 pthread_mutex_unlock(&stream->lock);
2189 stream_put(stream);
2190 break;
2191 }
f7079f67 2192 }
7591bab1
MD
2193 pthread_mutex_unlock(&stream->lock);
2194 stream_put(stream);
f7079f67
DG
2195 }
2196 rcu_read_unlock();
2197
53efb85a 2198 memset(&reply, 0, sizeof(reply));
f7079f67
DG
2199 /* All good, send back reply. */
2200 reply.ret_code = htobe32(is_data_inflight);
2201
5312a3ed
JG
2202 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2203 if (send_ret < (ssize_t) sizeof(reply)) {
2204 ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
2205 send_ret);
2206 ret = -1;
2207 } else {
2208 ret = 0;
f7079f67
DG
2209 }
2210
2211end_no_session:
2212 return ret;
2213}
2214
1c20f0e2
JD
2215/*
2216 * Receive an index for a specific stream.
2217 *
2218 * Return 0 on success else a negative value.
2219 */
5312a3ed
JG
2220static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
2221 struct relay_connection *conn,
2222 const struct lttng_buffer_view *payload)
1c20f0e2 2223{
5312a3ed
JG
2224 int ret;
2225 ssize_t send_ret;
58eb9381 2226 struct relay_session *session = conn->session;
1c20f0e2 2227 struct lttcomm_relayd_index index_info;
7591bab1 2228 struct relay_index *index;
1c20f0e2
JD
2229 struct lttcomm_relayd_generic_reply reply;
2230 struct relay_stream *stream;
f8f3885c 2231 size_t msg_len;
1c20f0e2 2232
58eb9381 2233 assert(conn);
1c20f0e2
JD
2234
2235 DBG("Relay receiving index");
2236
5312a3ed 2237 if (!session || !conn->version_check_done) {
1c20f0e2
JD
2238 ERR("Trying to close a stream before version check");
2239 ret = -1;
2240 goto end_no_session;
2241 }
2242
f8f3885c
MD
2243 msg_len = lttcomm_relayd_index_len(
2244 lttng_to_index_major(conn->major, conn->minor),
2245 lttng_to_index_minor(conn->major, conn->minor));
5312a3ed
JG
2246 if (payload->size < msg_len) {
2247 ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
2248 msg_len, payload->size);
1c20f0e2
JD
2249 ret = -1;
2250 goto end_no_session;
2251 }
5312a3ed
JG
2252 memcpy(&index_info, payload->data, msg_len);
2253 index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
2254 index_info.net_seq_num = be64toh(index_info.net_seq_num);
2255 index_info.packet_size = be64toh(index_info.packet_size);
2256 index_info.content_size = be64toh(index_info.content_size);
2257 index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
2258 index_info.timestamp_end = be64toh(index_info.timestamp_end);
2259 index_info.events_discarded = be64toh(index_info.events_discarded);
2260 index_info.stream_id = be64toh(index_info.stream_id);
81df238b
JR
2261
2262 if (conn->minor >= 8) {
2263 index_info.stream_instance_id =
2264 be64toh(index_info.stream_instance_id);
2265 index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
2266 }
5312a3ed
JG
2267
2268 stream = stream_get_by_id(index_info.relay_stream_id);
1c20f0e2 2269 if (!stream) {
7591bab1 2270 ERR("stream_get_by_id not found");
1c20f0e2 2271 ret = -1;
7591bab1 2272 goto end;
1c20f0e2 2273 }
7591bab1 2274 pthread_mutex_lock(&stream->lock);
1c20f0e2 2275
d3e2ba59
JD
2276 /* Live beacon handling */
2277 if (index_info.packet_size == 0) {
7591bab1
MD
2278 DBG("Received live beacon for stream %" PRIu64,
2279 stream->stream_handle);
d3e2ba59
JD
2280
2281 /*
7591bab1
MD
2282 * Only flag a stream inactive when it has already
2283 * received data and no indexes are in flight.
d3e2ba59 2284 */
a44ca2ca 2285 if (stream->index_received_seqcount > 0
7591bab1 2286 && stream->indexes_in_flight == 0) {
5312a3ed 2287 stream->beacon_ts_end = index_info.timestamp_end;
d3e2ba59
JD
2288 }
2289 ret = 0;
7591bab1 2290 goto end_stream_put;
d3e2ba59
JD
2291 } else {
2292 stream->beacon_ts_end = -1ULL;
2293 }
2294
528f2ffa 2295 if (stream->ctf_stream_id == -1ULL) {
5312a3ed 2296 stream->ctf_stream_id = index_info.stream_id;
528f2ffa 2297 }
5312a3ed 2298 index = relay_index_get_by_id_or_create(stream, index_info.net_seq_num);
7591bab1
MD
2299 if (!index) {
2300 ret = -1;
2301 ERR("relay_index_get_by_id_or_create index NULL");
2302 goto end_stream_put;
1c20f0e2 2303 }
234cd636 2304 if (set_index_control_data(index, &index_info, conn)) {
7591bab1
MD
2305 ERR("set_index_control_data error");
2306 relay_index_put(index);
2307 ret = -1;
2308 goto end_stream_put;
2309 }
2310 ret = relay_index_try_flush(index);
2311 if (ret == 0) {
a44ca2ca
MD
2312 tracefile_array_commit_seq(stream->tfa);
2313 stream->index_received_seqcount++;
d3ecc550 2314 stream->pos_after_last_complete_data_index += index->total_size;
7591bab1
MD
2315 } else if (ret > 0) {
2316 /* no flush. */
2317 ret = 0;
2318 } else {
2319 ERR("relay_index_try_flush error %d", ret);
2320 relay_index_put(index);
2321 ret = -1;
1c20f0e2
JD
2322 }
2323
7591bab1
MD
2324end_stream_put:
2325 pthread_mutex_unlock(&stream->lock);
2326 stream_put(stream);
2327
2328end:
1c20f0e2 2329
53efb85a 2330 memset(&reply, 0, sizeof(reply));
1c20f0e2
JD
2331 if (ret < 0) {
2332 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2333 } else {
2334 reply.ret_code = htobe32(LTTNG_OK);
2335 }
58eb9381 2336 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
2337 if (send_ret < (ssize_t) sizeof(reply)) {
2338 ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
2339 ret = -1;
1c20f0e2
JD
2340 }
2341
2342end_no_session:
2343 return ret;
2344}
2345
a4baae1b
JD
2346/*
2347 * Receive the streams_sent message.
2348 *
2349 * Return 0 on success else a negative value.
2350 */
5312a3ed
JG
2351static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
2352 struct relay_connection *conn,
2353 const struct lttng_buffer_view *payload)
a4baae1b 2354{
5312a3ed
JG
2355 int ret;
2356 ssize_t send_ret;
a4baae1b
JD
2357 struct lttcomm_relayd_generic_reply reply;
2358
58eb9381 2359 assert(conn);
a4baae1b
JD
2360
2361 DBG("Relay receiving streams_sent");
2362
5312a3ed 2363 if (!conn->session || !conn->version_check_done) {
a4baae1b
JD
2364 ERR("Trying to close a stream before version check");
2365 ret = -1;
2366 goto end_no_session;
2367 }
2368
2369 /*
7591bab1
MD
2370 * Publish every pending stream in the connection recv list which are
2371 * now ready to be used by the viewer.
4a9daf17 2372 */
7591bab1 2373 publish_connection_local_streams(conn);
4a9daf17 2374
53efb85a 2375 memset(&reply, 0, sizeof(reply));
a4baae1b 2376 reply.ret_code = htobe32(LTTNG_OK);
58eb9381 2377 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
2378 if (send_ret < (ssize_t) sizeof(reply)) {
2379 ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
2380 send_ret);
2381 ret = -1;
a4baae1b
JD
2382 } else {
2383 /* Success. */
2384 ret = 0;
2385 }
2386
2387end_no_session:
2388 return ret;
2389}
2390
d3ecc550 2391/*
5312a3ed 2392 * relay_rotate_session_stream: rotate a stream to a new tracefile for the session
d3ecc550
JD
2393 * rotation feature (not the tracefile rotation feature).
2394 */
5312a3ed
JG
2395static int relay_rotate_session_stream(const struct lttcomm_relayd_hdr *recv_hdr,
2396 struct relay_connection *conn,
2397 const struct lttng_buffer_view *payload)
d3ecc550 2398{
5312a3ed
JG
2399 int ret;
2400 ssize_t send_ret;
d3ecc550
JD
2401 struct relay_session *session = conn->session;
2402 struct lttcomm_relayd_rotate_stream stream_info;
2403 struct lttcomm_relayd_generic_reply reply;
2404 struct relay_stream *stream;
5312a3ed
JG
2405 size_t header_len;
2406 size_t path_len;
2407 struct lttng_buffer_view new_path_view;
d3ecc550
JD
2408
2409 DBG("Rotate stream received");
2410
2411 if (!session || !conn->version_check_done) {
2412 ERR("Trying to rotate a stream before version check");
2413 ret = -1;
2414 goto end_no_reply;
2415 }
2416
2417 if (session->major == 2 && session->minor < 11) {
2418 ERR("Unsupported feature before 2.11");
2419 ret = -1;
2420 goto end_no_reply;
2421 }
2422
5312a3ed 2423 header_len = sizeof(struct lttcomm_relayd_rotate_stream);
d3ecc550 2424
5312a3ed
JG
2425 if (payload->size < header_len) {
2426 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
2427 header_len, payload->size);
d3ecc550
JD
2428 ret = -1;
2429 goto end_no_reply;
2430 }
2431
5312a3ed
JG
2432 memcpy(&stream_info, payload->data, header_len);
2433
2434 /* Convert to host */
2435 stream_info.pathname_length = be32toh(stream_info.pathname_length);
2436 stream_info.stream_id = be64toh(stream_info.stream_id);
2437 stream_info.new_chunk_id = be64toh(stream_info.new_chunk_id);
2438 stream_info.rotate_at_seq_num = be64toh(stream_info.rotate_at_seq_num);
d3ecc550 2439
5312a3ed
JG
2440 path_len = stream_info.pathname_length;
2441 if (payload->size < header_len + path_len) {
2442 ERR("Unexpected payload size in \"relay_rotate_session_stream\" including path: expected >= %zu bytes, got %zu bytes",
2443 header_len + path_len, payload->size);
2444 ret = -1;
2445 goto end_no_reply;
2446 }
2447
d3ecc550 2448 /* Ensure it fits in local filename length. */
5312a3ed 2449 if (path_len >= LTTNG_PATH_MAX) {
d3ecc550
JD
2450 ret = -ENAMETOOLONG;
2451 ERR("Length of relay_rotate_session_stream command's path name (%zu bytes) exceeds the maximal allowed length of %i bytes",
5312a3ed 2452 path_len, LTTNG_PATH_MAX);
d3ecc550
JD
2453 goto end;
2454 }
2455
5312a3ed
JG
2456 new_path_view = lttng_buffer_view_from_view(payload, header_len,
2457 stream_info.pathname_length);
d3ecc550 2458
5312a3ed
JG
2459 stream = stream_get_by_id(stream_info.stream_id);
2460 if (!stream) {
d3ecc550 2461 ret = -1;
5312a3ed 2462 goto end;
d3ecc550
JD
2463 }
2464
2465 pthread_mutex_lock(&stream->lock);
2466
2467 /*
2468 * Update the trace path (just the folder, the stream name does not
2469 * change).
2470 */
2471 free(stream->path_name);
5312a3ed 2472 stream->path_name = create_output_path(new_path_view.data);
d3ecc550
JD
2473 if (!stream->path_name) {
2474 ERR("Failed to create a new output path");
5312a3ed 2475 ret = -1;
d3ecc550
JD
2476 goto end_stream_unlock;
2477 }
2478 ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG,
2479 -1, -1);
2480 if (ret < 0) {
2481 ERR("relay creating output directory");
5312a3ed 2482 ret = -1;
d3ecc550
JD
2483 goto end_stream_unlock;
2484 }
5312a3ed
JG
2485
2486 stream->chunk_id = stream_info.new_chunk_id;
d3ecc550
JD
2487
2488 if (stream->is_metadata) {
2489 /*
2490 * The metadata stream is sent only over the control connection
2491 * so we know we have all the data to perform the stream
2492 * rotation.
2493 */
2494 ret = do_rotate_stream(stream);
2495 } else {
5312a3ed 2496 stream->rotate_at_seq_num = stream_info.rotate_at_seq_num;
d3ecc550
JD
2497 ret = try_rotate_stream(stream);
2498 }
2499 if (ret < 0) {
2500 goto end_stream_unlock;
2501 }
2502
2503end_stream_unlock:
2504 pthread_mutex_unlock(&stream->lock);
2505 stream_put(stream);
2506end:
2507 memset(&reply, 0, sizeof(reply));
2508 if (ret < 0) {
2509 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2510 } else {
2511 reply.ret_code = htobe32(LTTNG_OK);
2512 }
2513 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2514 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
2515 if (send_ret < (ssize_t) sizeof(reply)) {
2516 ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
2517 send_ret);
2518 ret = -1;
d3ecc550
JD
2519 }
2520
2521end_no_reply:
d3ecc550
JD
2522 return ret;
2523}
2524
a1ae2ea5
JD
2525/*
2526 * relay_mkdir: Create a folder on the disk.
2527 */
5312a3ed
JG
2528static int relay_mkdir(const struct lttcomm_relayd_hdr *recv_hdr,
2529 struct relay_connection *conn,
2530 const struct lttng_buffer_view *payload)
a1ae2ea5
JD
2531{
2532 int ret;
a1ae2ea5
JD
2533 struct relay_session *session = conn->session;
2534 struct lttcomm_relayd_mkdir path_info_header;
a1ae2ea5
JD
2535 struct lttcomm_relayd_generic_reply reply;
2536 char *path = NULL;
5312a3ed
JG
2537 size_t header_len;
2538 ssize_t send_ret;
2539 struct lttng_buffer_view path_view;
a1ae2ea5
JD
2540
2541 if (!session || !conn->version_check_done) {
00fb02ac 2542 ERR("Trying to create a directory before version check");
a1ae2ea5
JD
2543 ret = -1;
2544 goto end_no_session;
2545 }
2546
2547 if (session->major == 2 && session->minor < 11) {
2548 /*
2549 * This client is not supposed to use this command since
2550 * it predates its introduction.
2551 */
2552 ERR("relay_mkdir command is unsupported before LTTng 2.11");
2553 ret = -1;
2554 goto end_no_session;
2555 }
2556
5312a3ed
JG
2557 header_len = sizeof(path_info_header);
2558 if (payload->size < header_len) {
2559 ERR("Unexpected payload size in \"relay_mkdir\": expected >= %zu bytes, got %zu bytes",
2560 header_len, payload->size);
a1ae2ea5
JD
2561 ret = -1;
2562 goto end_no_session;
2563 }
2564
5312a3ed
JG
2565 memcpy(&path_info_header, payload->data, header_len);
2566
a1ae2ea5
JD
2567 path_info_header.length = be32toh(path_info_header.length);
2568
5312a3ed
JG
2569 if (payload->size < header_len + path_info_header.length) {
2570 ERR("Unexpected payload size in \"relay_mkdir\" including path: expected >= %zu bytes, got %zu bytes",
2571 header_len + path_info_header.length, payload->size);
2572 ret = -1;
2573 goto end_no_session;
2574 }
2575
a1ae2ea5
JD
2576 /* Ensure that it fits in local path length. */
2577 if (path_info_header.length >= LTTNG_PATH_MAX) {
2578 ret = -ENAMETOOLONG;
2579 ERR("Path name argument of mkdir command (%" PRIu32 " bytes) exceeds the maximal length allowed (%d bytes)",
2580 path_info_header.length, LTTNG_PATH_MAX);
2581 goto end;
2582 }
2583
5312a3ed
JG
2584 path_view = lttng_buffer_view_from_view(payload, header_len,
2585 path_info_header.length);
a1ae2ea5 2586
5312a3ed 2587 path = create_output_path(path_view.data);
a1ae2ea5
JD
2588 if (!path) {
2589 ERR("Failed to create output path");
2590 ret = -1;
2591 goto end;
2592 }
2593
2594 ret = utils_mkdir_recursive(path, S_IRWXU | S_IRWXG, -1, -1);
2595 if (ret < 0) {
2596 ERR("relay creating output directory");
2597 goto end;
2598 }
2599
2600 ret = 0;
2601
2602end:
2603 memset(&reply, 0, sizeof(reply));
2604 if (ret < 0) {
2605 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2606 } else {
2607 reply.ret_code = htobe32(LTTNG_OK);
2608 }
5312a3ed
JG
2609 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2610 if (send_ret < (ssize_t) sizeof(reply)) {
2611 ERR("Failed to send \"mkdir\" command reply (ret = %zd)", send_ret);
a1ae2ea5
JD
2612 ret = -1;
2613 }
2614
2615end_no_session:
2616 free(path);
a1ae2ea5
JD
2617 return ret;
2618}
2619
00fb02ac
JD
2620static int validate_rotate_rename_path_length(const char *path_type,
2621 uint32_t path_length)
2622{
2623 int ret = 0;
2624
2625 if (path_length > LTTNG_PATH_MAX) {
2626 ret = -ENAMETOOLONG;
2627 ERR("rotate rename \"%s\" path name length (%" PRIu32 " bytes) exceeds the allowed size of %i bytes",
2628 path_type, path_length, LTTNG_PATH_MAX);
2629 } else if (path_length == 0) {
2630 ret = -EINVAL;
2631 ERR("rotate rename \"%s\" path name has an illegal length of 0", path_type);
2632 }
2633 return ret;
2634}
2635
2636/*
2637 * relay_rotate_rename: rename the trace folder after a rotation is
2638 * completed. We are not closing any fd here, just moving the folder, so it
2639 * works even if data is still in-flight.
2640 */
5312a3ed
JG
2641static int relay_rotate_rename(const struct lttcomm_relayd_hdr *recv_hdr,
2642 struct relay_connection *conn,
2643 const struct lttng_buffer_view *payload)
00fb02ac
JD
2644{
2645 int ret;
5312a3ed 2646 ssize_t send_ret;
00fb02ac
JD
2647 struct relay_session *session = conn->session;
2648 struct lttcomm_relayd_generic_reply reply;
2649 struct lttcomm_relayd_rotate_rename header;
5312a3ed 2650 size_t header_len;
00fb02ac 2651 size_t received_paths_size;
00fb02ac 2652 char *complete_old_path = NULL, *complete_new_path = NULL;
5312a3ed
JG
2653 struct lttng_buffer_view old_path_view;
2654 struct lttng_buffer_view new_path_view;
00fb02ac
JD
2655
2656 if (!session || !conn->version_check_done) {
2657 ERR("Trying to rename a trace folder before version check");
2658 ret = -1;
2659 goto end_no_reply;
2660 }
2661
2662 if (session->major == 2 && session->minor < 11) {
2663 ERR("relay_rotate_rename command is unsupported before LTTng 2.11");
2664 ret = -1;
2665 goto end_no_reply;
2666 }
2667
5312a3ed
JG
2668 header_len = sizeof(header);
2669 if (payload->size < header_len) {
2670 ERR("Unexpected payload size in \"relay_rotate_rename\": expected >= %zu bytes, got %zu bytes",
2671 header_len, payload->size);
00fb02ac
JD
2672 ret = -1;
2673 goto end_no_reply;
2674 }
2675
5312a3ed
JG
2676 memcpy(&header, payload->data, header_len);
2677
00fb02ac
JD
2678 header.old_path_length = be32toh(header.old_path_length);
2679 header.new_path_length = be32toh(header.new_path_length);
2680 received_paths_size = header.old_path_length + header.new_path_length;
2681
5312a3ed
JG
2682 if (payload->size < header_len + received_paths_size) {
2683 ERR("Unexpected payload size in \"relay_rotate_rename\" including paths: expected >= %zu bytes, got %zu bytes",
2684 header_len, payload->size);
2685 ret = -1;
2686 goto end_no_reply;
2687 }
2688
00fb02ac
JD
2689 /* Ensure the paths don't exceed their allowed size. */
2690 ret = validate_rotate_rename_path_length("old", header.old_path_length);
2691 if (ret) {
2692 goto end;
2693 }
2694 ret = validate_rotate_rename_path_length("new", header.new_path_length);
2695 if (ret) {
2696 goto end;
2697 }
2698
5312a3ed
JG
2699 old_path_view = lttng_buffer_view_from_view(payload, header_len,
2700 header.old_path_length);
2701 new_path_view = lttng_buffer_view_from_view(payload,
2702 header_len + header.old_path_length,
2703 header.new_path_length);
00fb02ac
JD
2704
2705 /* Validate that both paths received are NULL terminated. */
5312a3ed 2706 if (old_path_view.data[old_path_view.size - 1] != '\0') {
00fb02ac
JD
2707 ERR("relay_rotate_rename command's \"old\" path is invalid (not NULL terminated)");
2708 ret = -1;
2709 goto end;
2710 }
5312a3ed 2711 if (new_path_view.data[new_path_view.size - 1] != '\0') {
00fb02ac
JD
2712 ERR("relay_rotate_rename command's \"new\" path is invalid (not NULL terminated)");
2713 ret = -1;
2714 goto end;
2715 }
2716
5312a3ed 2717 complete_old_path = create_output_path(old_path_view.data);
00fb02ac
JD
2718 if (!complete_old_path) {
2719 ERR("Failed to build old output path in rotate_rename command");
2720 ret = -1;
2721 goto end;
2722 }
2723
5312a3ed 2724 complete_new_path = create_output_path(new_path_view.data);
00fb02ac
JD
2725 if (!complete_new_path) {
2726 ERR("Failed to build new output path in rotate_rename command");
2727 ret = -1;
2728 goto end;
2729 }
2730
2731 ret = utils_mkdir_recursive(complete_new_path, S_IRWXU | S_IRWXG,
2732 -1, -1);
2733 if (ret < 0) {
2734 ERR("Failed to mkdir() rotate_rename's \"new\" output directory at \"%s\"",
2735 complete_new_path);
2736 goto end;
2737 }
2738
2739 /*
2740 * If a domain has not yet created its channel, the domain-specific
2741 * folder might not exist, but this is not an error.
2742 */
2743 ret = rename(complete_old_path, complete_new_path);
2744 if (ret < 0 && errno != ENOENT) {
2745 PERROR("Renaming chunk in rotate_rename command from \"%s\" to \"%s\"",
2746 complete_old_path, complete_new_path);
2747 goto end;
2748 }
2749 ret = 0;
2750
2751end:
2752 memset(&reply, 0, sizeof(reply));
2753 if (ret < 0) {
2754 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2755 } else {
2756 reply.ret_code = htobe32(LTTNG_OK);
2757 }
5312a3ed
JG
2758 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2759 sizeof(reply), 0);
2760 if (send_ret < sizeof(reply)) {
2761 ERR("Failed to send \"rotate rename\" command reply (ret = %zd)",
2762 send_ret);
00fb02ac
JD
2763 ret = -1;
2764 }
2765
2766end_no_reply:
00fb02ac
JD
2767 free(complete_old_path);
2768 free(complete_new_path);
2769 return ret;
2770}
2771
e2acc8d2
JD
2772/*
2773 * Check if all the streams in the session have completed the last rotation.
2774 * The chunk_id value is used to distinguish the cases where a stream was
2775 * closed on the consumerd before the rotation started but it still active on
2776 * the relayd, and the case where a stream appeared on the consumerd/relayd
2777 * after the last rotation started (in that case, it is already writing in the
2778 * new chunk folder).
2779 */
2780static
5312a3ed
JG
2781int relay_rotate_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2782 struct relay_connection *conn,
2783 const struct lttng_buffer_view *payload)
e2acc8d2
JD
2784{
2785 struct relay_session *session = conn->session;
2786 struct lttcomm_relayd_rotate_pending msg;
d88744a4 2787 struct lttcomm_relayd_rotate_pending_reply reply;
e2acc8d2
JD
2788 struct lttng_ht_iter iter;
2789 struct relay_stream *stream;
4f5fb4c3 2790 int ret = 0;
5312a3ed 2791 ssize_t send_ret;
e2acc8d2
JD
2792 uint64_t chunk_id;
2793 bool rotate_pending = false;
2794
2795 DBG("Rotate pending command received");
2796
2797 if (!session || !conn->version_check_done) {
2798 ERR("Trying to check for data before version check");
2799 ret = -1;
2800 goto end_no_reply;
2801 }
2802
2803 if (session->major == 2 && session->minor < 11) {
2804 ERR("Unsupported feature before 2.11");
2805 ret = -1;
2806 goto end_no_reply;
2807 }
2808
5312a3ed
JG
2809 if (payload->size < sizeof(msg)) {
2810 ERR("Unexpected payload size in \"relay_rotate_pending\": expected >= %zu bytes, got %zu bytes",
2811 sizeof(msg), payload->size);
e2acc8d2
JD
2812 ret = -1;
2813 goto end_no_reply;
2814 }
2815
5312a3ed
JG
2816 memcpy(&msg, payload->data, sizeof(msg));
2817
e2acc8d2 2818 chunk_id = be64toh(msg.chunk_id);
5312a3ed 2819
e2acc8d2
JD
2820 DBG("Evaluating rotate pending for chunk id %" PRIu64, chunk_id);
2821
2822 /*
2823 * Iterate over all the streams in the session and check if they are
2824 * still waiting for data to perform their rotation.
2825 */
2826 rcu_read_lock();
2827 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2828 node.node) {
2829 if (!stream_get(stream)) {
2830 continue;
2831 }
2832 if (stream->trace->session != session) {
2833 stream_put(stream);
2834 continue;
2835 }
2836 pthread_mutex_lock(&stream->lock);
2837 if (stream->rotate_at_seq_num != -1ULL) {
2838 /* We have not yet performed the rotation. */
2839 rotate_pending = true;
2840 DBG("Stream %" PRIu64 " is still rotating",
2841 stream->stream_handle);
2842 } else if (stream->chunk_id < chunk_id) {
2843 /*
2844 * Stream closed on the consumer but still active on the
2845 * relay.
2846 */
2847 rotate_pending = true;
2848 DBG("Stream %" PRIu64 " did not exist on the consumer "
2849 "when the last rotation started, but is"
2850 "still waiting for data before getting"
2851 "closed",
2852 stream->stream_handle);
2853 }
2854 pthread_mutex_unlock(&stream->lock);
2855 stream_put(stream);
2856 if (rotate_pending) {
2857 goto send_reply;
2858 }
2859 }
2860
2861send_reply:
2862 rcu_read_unlock();
2863 memset(&reply, 0, sizeof(reply));
d88744a4
JD
2864 reply.generic.ret_code = htobe32((uint32_t) LTTNG_OK);
2865 reply.is_pending = (uint8_t) !!rotate_pending;
5312a3ed 2866 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
e2acc8d2 2867 sizeof(reply), 0);
5312a3ed
JG
2868 if (send_ret < (ssize_t) sizeof(reply)) {
2869 ERR("Failed to send \"rotate pending\" command reply (ret = %zd)",
2870 send_ret);
e2acc8d2
JD
2871 ret = -1;
2872 }
2873
2874end_no_reply:
2875 return ret;
2876}
2877
5312a3ed
JG
2878#define DBG_CMD(cmd_name, conn) \
2879 DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
2880
2881static int relay_process_control_command(struct relay_connection *conn,
2882 const struct lttcomm_relayd_hdr *header,
2883 const struct lttng_buffer_view *payload)
b8aa1682
JD
2884{
2885 int ret = 0;
2886
5312a3ed 2887 switch (header->cmd) {
b8aa1682 2888 case RELAYD_CREATE_SESSION:
5312a3ed
JG
2889 DBG_CMD("RELAYD_CREATE_SESSION", conn);
2890 ret = relay_create_session(header, conn, payload);
b8aa1682 2891 break;
b8aa1682 2892 case RELAYD_ADD_STREAM:
5312a3ed
JG
2893 DBG_CMD("RELAYD_ADD_STREAM", conn);
2894 ret = relay_add_stream(header, conn, payload);
b8aa1682
JD
2895 break;
2896 case RELAYD_START_DATA:
5312a3ed
JG
2897 DBG_CMD("RELAYD_START_DATA", conn);
2898 ret = relay_start(header, conn, payload);
b8aa1682
JD
2899 break;
2900 case RELAYD_SEND_METADATA:
5312a3ed
JG
2901 DBG_CMD("RELAYD_SEND_METADATA", conn);
2902 ret = relay_recv_metadata(header, conn, payload);
b8aa1682
JD
2903 break;
2904 case RELAYD_VERSION:
5312a3ed
JG
2905 DBG_CMD("RELAYD_VERSION", conn);
2906 ret = relay_send_version(header, conn, payload);
b8aa1682 2907 break;
173af62f 2908 case RELAYD_CLOSE_STREAM:
5312a3ed
JG
2909 DBG_CMD("RELAYD_CLOSE_STREAM", conn);
2910 ret = relay_close_stream(header, conn, payload);
173af62f 2911 break;
6d805429 2912 case RELAYD_DATA_PENDING:
5312a3ed
JG
2913 DBG_CMD("RELAYD_DATA_PENDING", conn);
2914 ret = relay_data_pending(header, conn, payload);
c8f59ee5
DG
2915 break;
2916 case RELAYD_QUIESCENT_CONTROL:
5312a3ed
JG
2917 DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
2918 ret = relay_quiescent_control(header, conn, payload);
c8f59ee5 2919 break;
f7079f67 2920 case RELAYD_BEGIN_DATA_PENDING:
5312a3ed
JG
2921 DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
2922 ret = relay_begin_data_pending(header, conn, payload);
f7079f67
DG
2923 break;
2924 case RELAYD_END_DATA_PENDING:
5312a3ed
JG
2925 DBG_CMD("RELAYD_END_DATA_PENDING", conn);
2926 ret = relay_end_data_pending(header, conn, payload);
f7079f67 2927 break;
1c20f0e2 2928 case RELAYD_SEND_INDEX:
5312a3ed
JG
2929 DBG_CMD("RELAYD_SEND_INDEX", conn);
2930 ret = relay_recv_index(header, conn, payload);
1c20f0e2 2931 break;
a4baae1b 2932 case RELAYD_STREAMS_SENT:
5312a3ed
JG
2933 DBG_CMD("RELAYD_STREAMS_SENT", conn);
2934 ret = relay_streams_sent(header, conn, payload);
a4baae1b 2935 break;
93ec662e 2936 case RELAYD_RESET_METADATA:
5312a3ed
JG
2937 DBG_CMD("RELAYD_RESET_METADATA", conn);
2938 ret = relay_reset_metadata(header, conn, payload);
93ec662e 2939 break;
d3ecc550 2940 case RELAYD_ROTATE_STREAM:
5312a3ed
JG
2941 DBG_CMD("RELAYD_ROTATE_STREAM", conn);
2942 ret = relay_rotate_session_stream(header, conn, payload);
d3ecc550 2943 break;
00fb02ac 2944 case RELAYD_ROTATE_RENAME:
5312a3ed
JG
2945 DBG_CMD("RELAYD_ROTATE_RENAME", conn);
2946 ret = relay_rotate_rename(header, conn, payload);
00fb02ac 2947 break;
e2acc8d2 2948 case RELAYD_ROTATE_PENDING:
5312a3ed
JG
2949 DBG_CMD("RELAYD_ROTATE_PENDING", conn);
2950 ret = relay_rotate_pending(header, conn, payload);
e2acc8d2 2951 break;
a1ae2ea5 2952 case RELAYD_MKDIR:
5312a3ed
JG
2953 DBG_CMD("RELAYD_MKDIR", conn);
2954 ret = relay_mkdir(header, conn, payload);
a1ae2ea5 2955 break;
b8aa1682
JD
2956 case RELAYD_UPDATE_SYNC_INFO:
2957 default:
5312a3ed 2958 ERR("Received unknown command (%u)", header->cmd);
58eb9381 2959 relay_unknown_command(conn);
b8aa1682
JD
2960 ret = -1;
2961 goto end;
2962 }
2963
2964end:
2965 return ret;
2966}
2967
5569b118
JG
2968static enum relay_connection_status relay_process_control_receive_payload(
2969 struct relay_connection *conn)
5312a3ed
JG
2970{
2971 int ret = 0;
5569b118 2972 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG
2973 struct lttng_dynamic_buffer *reception_buffer =
2974 &conn->protocol.ctrl.reception_buffer;
2975 struct ctrl_connection_state_receive_payload *state =
2976 &conn->protocol.ctrl.state.receive_payload;
2977 struct lttng_buffer_view payload_view;
2978
2979 if (state->left_to_receive == 0) {
2980 /* Short-circuit for payload-less commands. */
2981 goto reception_complete;
2982 }
2983
2984 ret = conn->sock->ops->recvmsg(conn->sock,
2985 reception_buffer->data + state->received,
2986 state->left_to_receive, MSG_DONTWAIT);
2987 if (ret < 0) {
5569b118
JG
2988 if (errno != EAGAIN && errno != EWOULDBLOCK) {
2989 PERROR("Unable to receive command payload on sock %d",
2990 conn->sock->fd);
2991 status = RELAY_CONNECTION_STATUS_ERROR;
2992 }
5312a3ed
JG
2993 goto end;
2994 } else if (ret == 0) {
2995 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 2996 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG
2997 goto end;
2998 }
2999
3000 assert(ret > 0);
3001 assert(ret <= state->left_to_receive);
3002
3003 state->left_to_receive -= ret;
3004 state->received += ret;
3005
3006 if (state->left_to_receive > 0) {
3007 /*
3008 * Can't transition to the protocol's next state, wait to
3009 * receive the rest of the header.
3010 */
3011 DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3012 state->received, state->left_to_receive,
3013 conn->sock->fd);
5312a3ed
JG
3014 goto end;
3015 }
3016
3017reception_complete:
3018 DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
3019 conn->sock->fd, state->received);
3020 /*
3021 * The payload required to process the command has been received.
3022 * A view to the reception buffer is forwarded to the various
3023 * commands and the state of the control is reset on success.
3024 *
3025 * Commands are responsible for sending their reply to the peer.
3026 */
3027 payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
3028 0, -1);
3029 ret = relay_process_control_command(conn,
3030 &state->header, &payload_view);
3031 if (ret < 0) {
5569b118 3032 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG
3033 goto end;
3034 }
3035
3036 ret = connection_reset_protocol_state(conn);
5569b118
JG
3037 if (ret) {
3038 status = RELAY_CONNECTION_STATUS_ERROR;
3039 }
5312a3ed 3040end:
5569b118 3041 return status;
5312a3ed
JG
3042}
3043
5569b118
JG
3044static enum relay_connection_status relay_process_control_receive_header(
3045 struct relay_connection *conn)
5312a3ed
JG
3046{
3047 int ret = 0;
5569b118 3048 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG
3049 struct lttcomm_relayd_hdr header;
3050 struct lttng_dynamic_buffer *reception_buffer =
3051 &conn->protocol.ctrl.reception_buffer;
3052 struct ctrl_connection_state_receive_header *state =
3053 &conn->protocol.ctrl.state.receive_header;
3054
3055 assert(state->left_to_receive != 0);
3056
3057 ret = conn->sock->ops->recvmsg(conn->sock,
3058 reception_buffer->data + state->received,
3059 state->left_to_receive, MSG_DONTWAIT);
3060 if (ret < 0) {
5569b118
JG
3061 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3062 PERROR("Unable to receive control command header on sock %d",
3063 conn->sock->fd);
3064 status = RELAY_CONNECTION_STATUS_ERROR;
3065 }
5312a3ed
JG
3066 goto end;
3067 } else if (ret == 0) {
3068 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3069 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG
3070 goto end;
3071 }
3072
3073 assert(ret > 0);
3074 assert(ret <= state->left_to_receive);
3075
3076 state->left_to_receive -= ret;
3077 state->received += ret;
3078
3079 if (state->left_to_receive > 0) {
3080 /*
3081 * Can't transition to the protocol's next state, wait to
3082 * receive the rest of the header.
3083 */
3084 DBG3("Partial reception of control connection protocol header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3085 state->received, state->left_to_receive,
3086 conn->sock->fd);
5312a3ed
JG
3087 goto end;
3088 }
3089
3090 /* Transition to next state: receiving the command's payload. */
3091 conn->protocol.ctrl.state_id =
3092 CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD;
3093 memcpy(&header, reception_buffer->data, sizeof(header));
3094 header.circuit_id = be64toh(header.circuit_id);
3095 header.data_size = be64toh(header.data_size);
3096 header.cmd = be32toh(header.cmd);
3097 header.cmd_version = be32toh(header.cmd_version);
3098 memcpy(&conn->protocol.ctrl.state.receive_payload.header,
3099 &header, sizeof(header));
3100
3101 DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32 ", cmd_version = %" PRIu32 ", payload size = %" PRIu64 " bytes",
3102 conn->sock->fd, header.cmd, header.cmd_version,
3103 header.data_size);
3104
715e6fb1 3105 if (header.data_size > DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE) {
5312a3ed
JG
3106 ERR("Command header indicates a payload (%" PRIu64 " bytes) that exceeds the maximal payload size allowed on a control connection.",
3107 header.data_size);
5569b118 3108 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG
3109 goto end;
3110 }
3111
3112 conn->protocol.ctrl.state.receive_payload.left_to_receive =
3113 header.data_size;
3114 conn->protocol.ctrl.state.receive_payload.received = 0;
3115 ret = lttng_dynamic_buffer_set_size(reception_buffer,
3116 header.data_size);
3117 if (ret) {
5569b118 3118 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG
3119 goto end;
3120 }
3121
3122 if (header.data_size == 0) {
3123 /*
3124 * Manually invoke the next state as the poll loop
3125 * will not wake-up to allow us to proceed further.
3126 */
5569b118 3127 status = relay_process_control_receive_payload(conn);
5312a3ed
JG
3128 }
3129end:
5569b118 3130 return status;
5312a3ed
JG
3131}
3132
3133/*
3134 * Process the commands received on the control socket
3135 */
5569b118
JG
3136static enum relay_connection_status relay_process_control(
3137 struct relay_connection *conn)
5312a3ed 3138{
5569b118 3139 enum relay_connection_status status;
5312a3ed
JG
3140
3141 switch (conn->protocol.ctrl.state_id) {
3142 case CTRL_CONNECTION_STATE_RECEIVE_HEADER:
5569b118 3143 status = relay_process_control_receive_header(conn);
5312a3ed
JG
3144 break;
3145 case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD:
5569b118 3146 status = relay_process_control_receive_payload(conn);
5312a3ed
JG
3147 break;
3148 default:
3149 ERR("Unknown control connection protocol state encountered.");
3150 abort();
3151 }
3152
5569b118 3153 return status;
5312a3ed
JG
3154}
3155
7d2f7452
DG
3156/*
3157 * Handle index for a data stream.
3158 *
7591bab1 3159 * Called with the stream lock held.
7d2f7452
DG
3160 *
3161 * Return 0 on success else a negative value.
3162 */
3163static int handle_index_data(struct relay_stream *stream, uint64_t net_seq_num,
5312a3ed 3164 bool rotate_index, bool *flushed, uint64_t total_size)
7d2f7452 3165{
7591bab1
MD
3166 int ret = 0;
3167 uint64_t data_offset;
3168 struct relay_index *index;
7d2f7452 3169
7d2f7452
DG
3170 /* Get data offset because we are about to update the index. */
3171 data_offset = htobe64(stream->tracefile_size_current);
3172
65d66b19
MD
3173 DBG("handle_index_data: stream %" PRIu64 " net_seq_num %" PRIu64 " data offset %" PRIu64,
3174 stream->stream_handle, net_seq_num, stream->tracefile_size_current);
7591bab1 3175
7d2f7452 3176 /*
7591bab1
MD
3177 * Lookup for an existing index for that stream id/sequence
3178 * number. If it exists, the control thread has already received the
3179 * data for it, thus we need to write it to disk.
7d2f7452 3180 */
7591bab1 3181 index = relay_index_get_by_id_or_create(stream, net_seq_num);
7d2f7452 3182 if (!index) {
7591bab1
MD
3183 ret = -1;
3184 goto end;
7d2f7452
DG
3185 }
3186
f8f3885c 3187 if (rotate_index || !stream->index_file) {
d3ecc550
JD
3188 ret = create_rotate_index_file(stream);
3189 if (ret < 0) {
3190 ERR("Failed to rotate index");
7591bab1
MD
3191 /* Put self-ref for this index due to error. */
3192 relay_index_put(index);
f8f3885c 3193 index = NULL;
7591bab1 3194 goto end;
7d2f7452 3195 }
7d2f7452
DG
3196 }
3197
f8f3885c 3198 if (relay_index_set_file(index, stream->index_file, data_offset)) {
7591bab1
MD
3199 ret = -1;
3200 /* Put self-ref for this index due to error. */
3201 relay_index_put(index);
f8f3885c 3202 index = NULL;
7591bab1 3203 goto end;
7d2f7452
DG
3204 }
3205
7591bab1
MD
3206 ret = relay_index_try_flush(index);
3207 if (ret == 0) {
a44ca2ca
MD
3208 tracefile_array_commit_seq(stream->tfa);
3209 stream->index_received_seqcount++;
d3ecc550 3210 *flushed = true;
7591bab1 3211 } else if (ret > 0) {
d3ecc550 3212 index->total_size = total_size;
7591bab1
MD
3213 /* No flush. */
3214 ret = 0;
3215 } else {
3216 /* Put self-ref for this index due to error. */
3217 relay_index_put(index);
f8f3885c 3218 index = NULL;
7591bab1
MD
3219 ret = -1;
3220 }
3221end:
7d2f7452
DG
3222 return ret;
3223}
3224
5569b118
JG
3225static enum relay_connection_status relay_process_data_receive_header(
3226 struct relay_connection *conn)
b8aa1682 3227{
5312a3ed 3228 int ret;
5569b118 3229 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG
3230 struct data_connection_state_receive_header *state =
3231 &conn->protocol.data.state.receive_header;
3232 struct lttcomm_relayd_data_hdr header;
b8aa1682 3233 struct relay_stream *stream;
5312a3ed
JG
3234
3235 assert(state->left_to_receive != 0);
3236
3237 ret = conn->sock->ops->recvmsg(conn->sock,
3238 state->header_reception_buffer + state->received,
3239 state->left_to_receive, MSG_DONTWAIT);
3240 if (ret < 0) {
5569b118
JG
3241 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3242 PERROR("Unable to receive data header on sock %d", conn->sock->fd);
3243 status = RELAY_CONNECTION_STATUS_ERROR;
3244 }
5312a3ed
JG
3245 goto end;
3246 } else if (ret == 0) {
3247 /* Orderly shutdown. Not necessary to print an error. */
3248 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3249 status = RELAY_CONNECTION_STATUS_CLOSED;
b8aa1682
JD
3250 goto end;
3251 }
3252
5312a3ed
JG
3253 assert(ret > 0);
3254 assert(ret <= state->left_to_receive);
3255
3256 state->left_to_receive -= ret;
3257 state->received += ret;