Fix: remove assertions of the existence of a trace chunk
[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"
23c8ff50 77#include "sessiond-trace-chunks.h"
b8aa1682 78
4fc83d94
PP
79static const char *help_msg =
80#ifdef LTTNG_EMBED_HELP
81#include <lttng-relayd.8.h>
82#else
83NULL
84#endif
85;
86
5569b118
JG
87enum relay_connection_status {
88 RELAY_CONNECTION_STATUS_OK,
a9577b76 89 /* An error occurred while processing an event on the connection. */
5569b118
JG
90 RELAY_CONNECTION_STATUS_ERROR,
91 /* Connection closed/shutdown cleanly. */
92 RELAY_CONNECTION_STATUS_CLOSED,
93};
94
b8aa1682 95/* command line options */
0f907de1 96char *opt_output_path;
b5218ffb 97static int opt_daemon, opt_background;
3fd27398
MD
98
99/*
100 * We need to wait for listener and live listener threads, as well as
101 * health check thread, before being ready to signal readiness.
102 */
103#define NR_LTTNG_RELAY_READY 3
104static int lttng_relay_ready = NR_LTTNG_RELAY_READY;
0848dba7
MD
105
106/* Size of receive buffer. */
107#define RECV_DATA_BUFFER_SIZE 65536
d3ecc550 108#define FILE_COPY_BUFFER_SIZE 65536
0848dba7 109
3fd27398
MD
110static int recv_child_signal; /* Set to 1 when a SIGUSR1 signal is received. */
111static pid_t child_ppid; /* Internal parent PID use with daemonize. */
112
095a4ae5
MD
113static struct lttng_uri *control_uri;
114static struct lttng_uri *data_uri;
d3e2ba59 115static struct lttng_uri *live_uri;
b8aa1682
JD
116
117const char *progname;
b8aa1682 118
65931c8b 119const char *tracing_group_name = DEFAULT_TRACING_GROUP;
cd60b05a
JG
120static int tracing_group_name_override;
121
122const char * const config_section_name = "relayd";
65931c8b 123
b8aa1682
JD
124/*
125 * Quit pipe for all threads. This permits a single cancellation point
126 * for all threads when receiving an event on the pipe.
127 */
0b242f62 128int thread_quit_pipe[2] = { -1, -1 };
b8aa1682
JD
129
130/*
131 * This pipe is used to inform the worker thread that a command is queued and
132 * ready to be processed.
133 */
58eb9381 134static int relay_conn_pipe[2] = { -1, -1 };
b8aa1682 135
26c9d55e 136/* Shared between threads */
b8aa1682
JD
137static int dispatch_thread_exit;
138
139static pthread_t listener_thread;
140static pthread_t dispatcher_thread;
141static pthread_t worker_thread;
65931c8b 142static pthread_t health_thread;
b8aa1682 143
7591bab1
MD
144/*
145 * last_relay_stream_id_lock protects last_relay_stream_id increment
146 * atomicity on 32-bit architectures.
147 */
148static pthread_mutex_t last_relay_stream_id_lock = PTHREAD_MUTEX_INITIALIZER;
095a4ae5 149static uint64_t last_relay_stream_id;
b8aa1682
JD
150
151/*
152 * Relay command queue.
153 *
154 * The relay_thread_listener and relay_thread_dispatcher communicate with this
155 * queue.
156 */
58eb9381 157static struct relay_conn_queue relay_conn_queue;
b8aa1682 158
d3e2ba59
JD
159/* Global relay stream hash table. */
160struct lttng_ht *relay_streams_ht;
161
92c6ca54
DG
162/* Global relay viewer stream hash table. */
163struct lttng_ht *viewer_streams_ht;
164
7591bab1
MD
165/* Global relay sessions hash table. */
166struct lttng_ht *sessions_ht;
0a6518b0 167
55706a7d 168/* Relayd health monitoring */
eea7556c 169struct health_app *health_relayd;
55706a7d 170
23c8ff50
JG
171struct sessiond_trace_chunk_registry *sessiond_trace_chunk_registry;
172
cd60b05a
JG
173static struct option long_options[] = {
174 { "control-port", 1, 0, 'C', },
175 { "data-port", 1, 0, 'D', },
8d5c808e 176 { "live-port", 1, 0, 'L', },
cd60b05a 177 { "daemonize", 0, 0, 'd', },
b5218ffb 178 { "background", 0, 0, 'b', },
cd60b05a
JG
179 { "group", 1, 0, 'g', },
180 { "help", 0, 0, 'h', },
181 { "output", 1, 0, 'o', },
182 { "verbose", 0, 0, 'v', },
183 { "config", 1, 0, 'f' },
3a904098 184 { "version", 0, 0, 'V' },
cd60b05a
JG
185 { NULL, 0, 0, 0, },
186};
187
3a904098 188static const char *config_ignore_options[] = { "help", "config", "version" };
cd60b05a 189
cd60b05a
JG
190/*
191 * Take an option from the getopt output and set it in the right variable to be
192 * used later.
193 *
194 * Return 0 on success else a negative value.
195 */
7591bab1 196static int set_option(int opt, const char *arg, const char *optname)
b8aa1682 197{
cd60b05a
JG
198 int ret;
199
200 switch (opt) {
201 case 0:
202 fprintf(stderr, "option %s", optname);
203 if (arg) {
204 fprintf(stderr, " with arg %s\n", arg);
205 }
206 break;
207 case 'C':
e8fa9fb0
MD
208 if (lttng_is_setuid_setgid()) {
209 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
210 "-C, --control-port");
211 } else {
212 ret = uri_parse(arg, &control_uri);
213 if (ret < 0) {
214 ERR("Invalid control URI specified");
215 goto end;
216 }
217 if (control_uri->port == 0) {
218 control_uri->port = DEFAULT_NETWORK_CONTROL_PORT;
219 }
cd60b05a
JG
220 }
221 break;
222 case 'D':
e8fa9fb0
MD
223 if (lttng_is_setuid_setgid()) {
224 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
225 "-D, -data-port");
226 } else {
227 ret = uri_parse(arg, &data_uri);
228 if (ret < 0) {
229 ERR("Invalid data URI specified");
230 goto end;
231 }
232 if (data_uri->port == 0) {
233 data_uri->port = DEFAULT_NETWORK_DATA_PORT;
234 }
cd60b05a
JG
235 }
236 break;
8d5c808e 237 case 'L':
e8fa9fb0
MD
238 if (lttng_is_setuid_setgid()) {
239 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
240 "-L, -live-port");
241 } else {
242 ret = uri_parse(arg, &live_uri);
243 if (ret < 0) {
244 ERR("Invalid live URI specified");
245 goto end;
246 }
247 if (live_uri->port == 0) {
248 live_uri->port = DEFAULT_NETWORK_VIEWER_PORT;
249 }
8d5c808e
AM
250 }
251 break;
cd60b05a
JG
252 case 'd':
253 opt_daemon = 1;
254 break;
b5218ffb
MD
255 case 'b':
256 opt_background = 1;
257 break;
cd60b05a 258 case 'g':
e8fa9fb0
MD
259 if (lttng_is_setuid_setgid()) {
260 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
261 "-g, --group");
262 } else {
263 tracing_group_name = strdup(arg);
264 if (tracing_group_name == NULL) {
265 ret = -errno;
266 PERROR("strdup");
267 goto end;
268 }
269 tracing_group_name_override = 1;
330a40bb 270 }
cd60b05a
JG
271 break;
272 case 'h':
4fc83d94 273 ret = utils_show_help(8, "lttng-relayd", help_msg);
655b5cc1 274 if (ret) {
4fc83d94 275 ERR("Cannot show --help for `lttng-relayd`");
655b5cc1
PP
276 perror("exec");
277 }
cd60b05a 278 exit(EXIT_FAILURE);
3a904098
AW
279 case 'V':
280 fprintf(stdout, "%s\n", VERSION);
281 exit(EXIT_SUCCESS);
cd60b05a 282 case 'o':
e8fa9fb0
MD
283 if (lttng_is_setuid_setgid()) {
284 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
285 "-o, --output");
286 } else {
287 ret = asprintf(&opt_output_path, "%s", arg);
288 if (ret < 0) {
289 ret = -errno;
290 PERROR("asprintf opt_output_path");
291 goto end;
292 }
cd60b05a
JG
293 }
294 break;
295 case 'v':
296 /* Verbose level can increase using multiple -v */
297 if (arg) {
298 lttng_opt_verbose = config_parse_value(arg);
299 } else {
849e5b7b
DG
300 /* Only 3 level of verbosity (-vvv). */
301 if (lttng_opt_verbose < 3) {
302 lttng_opt_verbose += 1;
303 }
cd60b05a
JG
304 }
305 break;
306 default:
307 /* Unknown option or other error.
308 * Error is printed by getopt, just return */
309 ret = -1;
310 goto end;
311 }
312
313 /* All good. */
314 ret = 0;
315
316end:
317 return ret;
318}
319
320/*
321 * config_entry_handler_cb used to handle options read from a config file.
f40ef1d5 322 * See config_entry_handler_cb comment in common/config/session-config.h for the
cd60b05a
JG
323 * return value conventions.
324 */
7591bab1 325static int config_entry_handler(const struct config_entry *entry, void *unused)
cd60b05a
JG
326{
327 int ret = 0, i;
328
329 if (!entry || !entry->name || !entry->value) {
330 ret = -EINVAL;
331 goto end;
332 }
333
334 /* Check if the option is to be ignored */
335 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
336 if (!strcmp(entry->name, config_ignore_options[i])) {
337 goto end;
338 }
339 }
340
341 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
342 /* Ignore if entry name is not fully matched. */
343 if (strcmp(entry->name, long_options[i].name)) {
344 continue;
345 }
346
347 /*
7591bab1
MD
348 * If the option takes no argument on the command line,
349 * we have to check if the value is "true". We support
350 * non-zero numeric values, true, on and yes.
cd60b05a
JG
351 */
352 if (!long_options[i].has_arg) {
353 ret = config_parse_value(entry->value);
354 if (ret <= 0) {
355 if (ret) {
356 WARN("Invalid configuration value \"%s\" for option %s",
357 entry->value, entry->name);
358 }
359 /* False, skip boolean config option. */
360 goto end;
361 }
362 }
363
364 ret = set_option(long_options[i].val, entry->value, entry->name);
365 goto end;
366 }
367
368 WARN("Unrecognized option \"%s\" in daemon configuration file.",
369 entry->name);
370
371end:
372 return ret;
373}
374
7591bab1 375static int set_options(int argc, char **argv)
cd60b05a 376{
178a0557 377 int c, ret = 0, option_index = 0, retval = 0;
cd60b05a
JG
378 int orig_optopt = optopt, orig_optind = optind;
379 char *default_address, *optstring;
380 const char *config_path = NULL;
381
382 optstring = utils_generate_optstring(long_options,
383 sizeof(long_options) / sizeof(struct option));
384 if (!optstring) {
178a0557 385 retval = -ENOMEM;
cd60b05a
JG
386 goto exit;
387 }
388
389 /* Check for the --config option */
390
391 while ((c = getopt_long(argc, argv, optstring, long_options,
392 &option_index)) != -1) {
393 if (c == '?') {
178a0557 394 retval = -EINVAL;
cd60b05a
JG
395 goto exit;
396 } else if (c != 'f') {
397 continue;
398 }
399
e8fa9fb0
MD
400 if (lttng_is_setuid_setgid()) {
401 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
402 "-f, --config");
403 } else {
404 config_path = utils_expand_path(optarg);
405 if (!config_path) {
406 ERR("Failed to resolve path: %s", optarg);
407 }
cd60b05a
JG
408 }
409 }
410
411 ret = config_get_section_entries(config_path, config_section_name,
412 config_entry_handler, NULL);
413 if (ret) {
414 if (ret > 0) {
415 ERR("Invalid configuration option at line %i", ret);
cd60b05a 416 }
178a0557 417 retval = -1;
cd60b05a
JG
418 goto exit;
419 }
b8aa1682 420
cd60b05a
JG
421 /* Reset getopt's global state */
422 optopt = orig_optopt;
423 optind = orig_optind;
b8aa1682 424 while (1) {
cd60b05a 425 c = getopt_long(argc, argv, optstring, long_options, &option_index);
b8aa1682
JD
426 if (c == -1) {
427 break;
428 }
429
cd60b05a
JG
430 ret = set_option(c, optarg, long_options[option_index].name);
431 if (ret < 0) {
178a0557 432 retval = -1;
b8aa1682
JD
433 goto exit;
434 }
435 }
436
437 /* assign default values */
438 if (control_uri == NULL) {
fa91dc52
MD
439 ret = asprintf(&default_address,
440 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS ":%d",
441 DEFAULT_NETWORK_CONTROL_PORT);
b8aa1682
JD
442 if (ret < 0) {
443 PERROR("asprintf default data address");
178a0557 444 retval = -1;
b8aa1682
JD
445 goto exit;
446 }
447
448 ret = uri_parse(default_address, &control_uri);
449 free(default_address);
450 if (ret < 0) {
451 ERR("Invalid control URI specified");
178a0557 452 retval = -1;
b8aa1682
JD
453 goto exit;
454 }
455 }
456 if (data_uri == NULL) {
fa91dc52
MD
457 ret = asprintf(&default_address,
458 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS ":%d",
459 DEFAULT_NETWORK_DATA_PORT);
b8aa1682
JD
460 if (ret < 0) {
461 PERROR("asprintf default data address");
178a0557 462 retval = -1;
b8aa1682
JD
463 goto exit;
464 }
465
466 ret = uri_parse(default_address, &data_uri);
467 free(default_address);
468 if (ret < 0) {
469 ERR("Invalid data URI specified");
178a0557 470 retval = -1;
b8aa1682
JD
471 goto exit;
472 }
473 }
d3e2ba59 474 if (live_uri == NULL) {
fa91dc52
MD
475 ret = asprintf(&default_address,
476 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS ":%d",
477 DEFAULT_NETWORK_VIEWER_PORT);
d3e2ba59
JD
478 if (ret < 0) {
479 PERROR("asprintf default viewer control address");
178a0557 480 retval = -1;
d3e2ba59
JD
481 goto exit;
482 }
483
484 ret = uri_parse(default_address, &live_uri);
485 free(default_address);
486 if (ret < 0) {
487 ERR("Invalid viewer control URI specified");
178a0557 488 retval = -1;
d3e2ba59
JD
489 goto exit;
490 }
491 }
b8aa1682
JD
492
493exit:
cd60b05a 494 free(optstring);
178a0557 495 return retval;
b8aa1682
JD
496}
497
7591bab1
MD
498static void print_global_objects(void)
499{
500 rcu_register_thread();
501
502 print_viewer_streams();
503 print_relay_streams();
504 print_sessions();
505
506 rcu_unregister_thread();
507}
508
b8aa1682
JD
509/*
510 * Cleanup the daemon
511 */
7591bab1 512static void relayd_cleanup(void)
b8aa1682 513{
7591bab1
MD
514 print_global_objects();
515
b8aa1682
JD
516 DBG("Cleaning up");
517
178a0557
MD
518 if (viewer_streams_ht)
519 lttng_ht_destroy(viewer_streams_ht);
520 if (relay_streams_ht)
521 lttng_ht_destroy(relay_streams_ht);
7591bab1
MD
522 if (sessions_ht)
523 lttng_ht_destroy(sessions_ht);
178a0557 524
095a4ae5
MD
525 /* free the dynamically allocated opt_output_path */
526 free(opt_output_path);
527
a02de639
CB
528 /* Close thread quit pipes */
529 utils_close_pipe(thread_quit_pipe);
530
710c1f73
DG
531 uri_free(control_uri);
532 uri_free(data_uri);
8d5c808e 533 /* Live URI is freed in the live thread. */
cd60b05a
JG
534
535 if (tracing_group_name_override) {
536 free((void *) tracing_group_name);
537 }
b8aa1682
JD
538}
539
540/*
541 * Write to writable pipe used to notify a thread.
542 */
7591bab1 543static int notify_thread_pipe(int wpipe)
b8aa1682 544{
6cd525e8 545 ssize_t ret;
b8aa1682 546
6cd525e8
MD
547 ret = lttng_write(wpipe, "!", 1);
548 if (ret < 1) {
b8aa1682 549 PERROR("write poll pipe");
b4aacfdc 550 goto end;
b8aa1682 551 }
b4aacfdc
MD
552 ret = 0;
553end:
b8aa1682
JD
554 return ret;
555}
556
7591bab1 557static int notify_health_quit_pipe(int *pipe)
65931c8b 558{
6cd525e8 559 ssize_t ret;
65931c8b 560
6cd525e8
MD
561 ret = lttng_write(pipe[1], "4", 1);
562 if (ret < 1) {
65931c8b 563 PERROR("write relay health quit");
b4aacfdc 564 goto end;
65931c8b 565 }
b4aacfdc
MD
566 ret = 0;
567end:
568 return ret;
65931c8b
MD
569}
570
b8aa1682 571/*
b4aacfdc 572 * Stop all relayd and relayd-live threads.
b8aa1682 573 */
b4aacfdc 574int lttng_relay_stop_threads(void)
b8aa1682 575{
b4aacfdc 576 int retval = 0;
b8aa1682
JD
577
578 /* Stopping all threads */
579 DBG("Terminating all threads");
b4aacfdc 580 if (notify_thread_pipe(thread_quit_pipe[1])) {
b8aa1682 581 ERR("write error on thread quit pipe");
b4aacfdc 582 retval = -1;
b8aa1682
JD
583 }
584
b4aacfdc
MD
585 if (notify_health_quit_pipe(health_quit_pipe)) {
586 ERR("write error on health quit pipe");
587 }
65931c8b 588
b8aa1682 589 /* Dispatch thread */
26c9d55e 590 CMM_STORE_SHARED(dispatch_thread_exit, 1);
58eb9381 591 futex_nto1_wake(&relay_conn_queue.futex);
178a0557 592
b4aacfdc 593 if (relayd_live_stop()) {
178a0557 594 ERR("Error stopping live threads");
b4aacfdc 595 retval = -1;
178a0557 596 }
b4aacfdc 597 return retval;
b8aa1682
JD
598}
599
600/*
601 * Signal handler for the daemon
602 *
603 * Simply stop all worker threads, leaving main() return gracefully after
604 * joining all threads and calling cleanup().
605 */
7591bab1 606static void sighandler(int sig)
b8aa1682
JD
607{
608 switch (sig) {
b8aa1682
JD
609 case SIGINT:
610 DBG("SIGINT caught");
b4aacfdc
MD
611 if (lttng_relay_stop_threads()) {
612 ERR("Error stopping threads");
613 }
b8aa1682
JD
614 break;
615 case SIGTERM:
616 DBG("SIGTERM caught");
b4aacfdc
MD
617 if (lttng_relay_stop_threads()) {
618 ERR("Error stopping threads");
619 }
b8aa1682 620 break;
3fd27398
MD
621 case SIGUSR1:
622 CMM_STORE_SHARED(recv_child_signal, 1);
623 break;
b8aa1682
JD
624 default:
625 break;
626 }
627}
628
629/*
630 * Setup signal handler for :
631 * SIGINT, SIGTERM, SIGPIPE
632 */
7591bab1 633static int set_signal_handler(void)
b8aa1682
JD
634{
635 int ret = 0;
636 struct sigaction sa;
637 sigset_t sigset;
638
639 if ((ret = sigemptyset(&sigset)) < 0) {
640 PERROR("sigemptyset");
641 return ret;
642 }
643
b8aa1682
JD
644 sa.sa_mask = sigset;
645 sa.sa_flags = 0;
0072e5e2
MD
646
647 sa.sa_handler = sighandler;
b8aa1682
JD
648 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
649 PERROR("sigaction");
650 return ret;
651 }
652
653 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
654 PERROR("sigaction");
655 return ret;
656 }
657
0072e5e2 658 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
b8aa1682
JD
659 PERROR("sigaction");
660 return ret;
661 }
662
0072e5e2
MD
663 sa.sa_handler = SIG_IGN;
664 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3fd27398
MD
665 PERROR("sigaction");
666 return ret;
667 }
668
669 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
b8aa1682
JD
670
671 return ret;
672}
673
3fd27398
MD
674void lttng_relay_notify_ready(void)
675{
676 /* Notify the parent of the fork() process that we are ready. */
677 if (opt_daemon || opt_background) {
678 if (uatomic_sub_return(&lttng_relay_ready, 1) == 0) {
679 kill(child_ppid, SIGUSR1);
680 }
681 }
682}
683
b8aa1682
JD
684/*
685 * Init thread quit pipe.
686 *
687 * Return -1 on error or 0 if all pipes are created.
688 */
7591bab1 689static int init_thread_quit_pipe(void)
b8aa1682 690{
a02de639 691 int ret;
b8aa1682 692
a02de639 693 ret = utils_create_pipe_cloexec(thread_quit_pipe);
b8aa1682 694
b8aa1682
JD
695 return ret;
696}
697
698/*
699 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
700 */
7591bab1 701static int create_thread_poll_set(struct lttng_poll_event *events, int size)
b8aa1682
JD
702{
703 int ret;
704
705 if (events == NULL || size == 0) {
706 ret = -1;
707 goto error;
708 }
709
710 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
711 if (ret < 0) {
712 goto error;
713 }
714
715 /* Add quit pipe */
c7759e6a 716 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
b8aa1682
JD
717 if (ret < 0) {
718 goto error;
719 }
720
721 return 0;
722
723error:
724 return ret;
725}
726
727/*
728 * Check if the thread quit pipe was triggered.
729 *
730 * Return 1 if it was triggered else 0;
731 */
7591bab1 732static int check_thread_quit_pipe(int fd, uint32_t events)
b8aa1682
JD
733{
734 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
735 return 1;
736 }
737
738 return 0;
739}
740
741/*
742 * Create and init socket from uri.
743 */
7591bab1 744static struct lttcomm_sock *relay_socket_create(struct lttng_uri *uri)
b8aa1682
JD
745{
746 int ret;
747 struct lttcomm_sock *sock = NULL;
748
749 sock = lttcomm_alloc_sock_from_uri(uri);
750 if (sock == NULL) {
751 ERR("Allocating socket");
752 goto error;
753 }
754
755 ret = lttcomm_create_sock(sock);
756 if (ret < 0) {
757 goto error;
758 }
759 DBG("Listening on sock %d", sock->fd);
760
761 ret = sock->ops->bind(sock);
762 if (ret < 0) {
2288467f 763 PERROR("Failed to bind socket");
b8aa1682
JD
764 goto error;
765 }
766
767 ret = sock->ops->listen(sock, -1);
768 if (ret < 0) {
769 goto error;
770
771 }
772
773 return sock;
774
775error:
776 if (sock) {
777 lttcomm_destroy_sock(sock);
778 }
779 return NULL;
780}
781
782/*
783 * This thread manages the listening for new connections on the network
784 */
7591bab1 785static void *relay_thread_listener(void *data)
b8aa1682 786{
095a4ae5 787 int i, ret, pollfd, err = -1;
b8aa1682
JD
788 uint32_t revents, nb_fd;
789 struct lttng_poll_event events;
790 struct lttcomm_sock *control_sock, *data_sock;
791
b8aa1682
JD
792 DBG("[thread] Relay listener started");
793
55706a7d
MD
794 health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
795
f385ae0a
MD
796 health_code_update();
797
7591bab1 798 control_sock = relay_socket_create(control_uri);
b8aa1682 799 if (!control_sock) {
095a4ae5 800 goto error_sock_control;
b8aa1682
JD
801 }
802
7591bab1 803 data_sock = relay_socket_create(data_uri);
b8aa1682 804 if (!data_sock) {
095a4ae5 805 goto error_sock_relay;
b8aa1682
JD
806 }
807
808 /*
7591bab1
MD
809 * Pass 3 as size here for the thread quit pipe, control and
810 * data socket.
b8aa1682
JD
811 */
812 ret = create_thread_poll_set(&events, 3);
813 if (ret < 0) {
814 goto error_create_poll;
815 }
816
817 /* Add the control socket */
818 ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP);
819 if (ret < 0) {
820 goto error_poll_add;
821 }
822
823 /* Add the data socket */
824 ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP);
825 if (ret < 0) {
826 goto error_poll_add;
827 }
828
3fd27398
MD
829 lttng_relay_notify_ready();
830
9b5e0863
MD
831 if (testpoint(relayd_thread_listener)) {
832 goto error_testpoint;
833 }
834
b8aa1682 835 while (1) {
f385ae0a
MD
836 health_code_update();
837
b8aa1682
JD
838 DBG("Listener accepting connections");
839
b8aa1682 840restart:
f385ae0a 841 health_poll_entry();
b8aa1682 842 ret = lttng_poll_wait(&events, -1);
f385ae0a 843 health_poll_exit();
b8aa1682
JD
844 if (ret < 0) {
845 /*
846 * Restart interrupted system call.
847 */
848 if (errno == EINTR) {
849 goto restart;
850 }
851 goto error;
852 }
853
0d9c5d77
DG
854 nb_fd = ret;
855
b8aa1682
JD
856 DBG("Relay new connection received");
857 for (i = 0; i < nb_fd; i++) {
f385ae0a
MD
858 health_code_update();
859
b8aa1682
JD
860 /* Fetch once the poll data */
861 revents = LTTNG_POLL_GETEV(&events, i);
862 pollfd = LTTNG_POLL_GETFD(&events, i);
863
864 /* Thread quit pipe has been closed. Killing thread. */
865 ret = check_thread_quit_pipe(pollfd, revents);
866 if (ret) {
095a4ae5
MD
867 err = 0;
868 goto exit;
b8aa1682
JD
869 }
870
03e43155 871 if (revents & LPOLLIN) {
4b7f17b2 872 /*
7591bab1
MD
873 * A new connection is requested, therefore a
874 * sessiond/consumerd connection is allocated in
875 * this thread, enqueued to a global queue and
876 * dequeued (and freed) in the worker thread.
4b7f17b2 877 */
58eb9381
DG
878 int val = 1;
879 struct relay_connection *new_conn;
4b7f17b2 880 struct lttcomm_sock *newsock;
7591bab1 881 enum connection_type type;
b8aa1682
JD
882
883 if (pollfd == data_sock->fd) {
7591bab1 884 type = RELAY_DATA;
b8aa1682 885 newsock = data_sock->ops->accept(data_sock);
58eb9381
DG
886 DBG("Relay data connection accepted, socket %d",
887 newsock->fd);
4b7f17b2
MD
888 } else {
889 assert(pollfd == control_sock->fd);
7591bab1 890 type = RELAY_CONTROL;
b8aa1682 891 newsock = control_sock->ops->accept(control_sock);
58eb9381
DG
892 DBG("Relay control connection accepted, socket %d",
893 newsock->fd);
b8aa1682 894 }
58eb9381
DG
895 if (!newsock) {
896 PERROR("accepting sock");
58eb9381
DG
897 goto error;
898 }
899
900 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
901 sizeof(val));
b8aa1682
JD
902 if (ret < 0) {
903 PERROR("setsockopt inet");
4b7f17b2 904 lttcomm_destroy_sock(newsock);
b8aa1682
JD
905 goto error;
906 }
f056029c
JR
907
908 ret = socket_apply_keep_alive_config(newsock->fd);
909 if (ret < 0) {
910 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
911 newsock->fd);
912 lttcomm_destroy_sock(newsock);
913 goto error;
914 }
915
7591bab1
MD
916 new_conn = connection_create(newsock, type);
917 if (!new_conn) {
918 lttcomm_destroy_sock(newsock);
919 goto error;
920 }
58eb9381
DG
921
922 /* Enqueue request for the dispatcher thread. */
8bdee6e2
SM
923 cds_wfcq_enqueue(&relay_conn_queue.head, &relay_conn_queue.tail,
924 &new_conn->qnode);
b8aa1682
JD
925
926 /*
7591bab1
MD
927 * Wake the dispatch queue futex.
928 * Implicit memory barrier with the
929 * exchange in cds_wfcq_enqueue.
b8aa1682 930 */
58eb9381 931 futex_nto1_wake(&relay_conn_queue.futex);
03e43155
MD
932 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
933 ERR("socket poll error");
934 goto error;
935 } else {
936 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
937 goto error;
b8aa1682
JD
938 }
939 }
940 }
941
095a4ae5 942exit:
b8aa1682
JD
943error:
944error_poll_add:
9b5e0863 945error_testpoint:
b8aa1682
JD
946 lttng_poll_clean(&events);
947error_create_poll:
095a4ae5
MD
948 if (data_sock->fd >= 0) {
949 ret = data_sock->ops->close(data_sock);
b8aa1682
JD
950 if (ret) {
951 PERROR("close");
952 }
b8aa1682 953 }
095a4ae5
MD
954 lttcomm_destroy_sock(data_sock);
955error_sock_relay:
956 if (control_sock->fd >= 0) {
957 ret = control_sock->ops->close(control_sock);
b8aa1682
JD
958 if (ret) {
959 PERROR("close");
960 }
b8aa1682 961 }
095a4ae5
MD
962 lttcomm_destroy_sock(control_sock);
963error_sock_control:
964 if (err) {
f385ae0a
MD
965 health_error();
966 ERR("Health error occurred in %s", __func__);
095a4ae5 967 }
55706a7d 968 health_unregister(health_relayd);
b8aa1682 969 DBG("Relay listener thread cleanup complete");
b4aacfdc 970 lttng_relay_stop_threads();
b8aa1682
JD
971 return NULL;
972}
973
974/*
975 * This thread manages the dispatching of the requests to worker threads
976 */
7591bab1 977static void *relay_thread_dispatcher(void *data)
b8aa1682 978{
6cd525e8
MD
979 int err = -1;
980 ssize_t ret;
8bdee6e2 981 struct cds_wfcq_node *node;
58eb9381 982 struct relay_connection *new_conn = NULL;
b8aa1682
JD
983
984 DBG("[thread] Relay dispatcher started");
985
55706a7d
MD
986 health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER);
987
9b5e0863
MD
988 if (testpoint(relayd_thread_dispatcher)) {
989 goto error_testpoint;
990 }
991
f385ae0a
MD
992 health_code_update();
993
0ed3b1a8 994 for (;;) {
f385ae0a
MD
995 health_code_update();
996
b8aa1682 997 /* Atomically prepare the queue futex */
58eb9381 998 futex_nto1_prepare(&relay_conn_queue.futex);
b8aa1682 999
0ed3b1a8
MD
1000 if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
1001 break;
1002 }
1003
b8aa1682 1004 do {
f385ae0a
MD
1005 health_code_update();
1006
b8aa1682 1007 /* Dequeue commands */
8bdee6e2
SM
1008 node = cds_wfcq_dequeue_blocking(&relay_conn_queue.head,
1009 &relay_conn_queue.tail);
b8aa1682
JD
1010 if (node == NULL) {
1011 DBG("Woken up but nothing in the relay command queue");
1012 /* Continue thread execution */
1013 break;
1014 }
58eb9381 1015 new_conn = caa_container_of(node, struct relay_connection, qnode);
b8aa1682 1016
58eb9381 1017 DBG("Dispatching request waiting on sock %d", new_conn->sock->fd);
b8aa1682
JD
1018
1019 /*
7591bab1
MD
1020 * Inform worker thread of the new request. This
1021 * call is blocking so we can be assured that
1022 * the data will be read at some point in time
1023 * or wait to the end of the world :)
b8aa1682 1024 */
58eb9381
DG
1025 ret = lttng_write(relay_conn_pipe[1], &new_conn, sizeof(new_conn));
1026 if (ret < 0) {
1027 PERROR("write connection pipe");
7591bab1 1028 connection_put(new_conn);
b8aa1682
JD
1029 goto error;
1030 }
1031 } while (node != NULL);
1032
1033 /* Futex wait on queue. Blocking call on futex() */
f385ae0a 1034 health_poll_entry();
58eb9381 1035 futex_nto1_wait(&relay_conn_queue.futex);
f385ae0a 1036 health_poll_exit();
b8aa1682
JD
1037 }
1038
f385ae0a
MD
1039 /* Normal exit, no error */
1040 err = 0;
1041
b8aa1682 1042error:
9b5e0863 1043error_testpoint:
f385ae0a
MD
1044 if (err) {
1045 health_error();
1046 ERR("Health error occurred in %s", __func__);
1047 }
55706a7d 1048 health_unregister(health_relayd);
b8aa1682 1049 DBG("Dispatch thread dying");
b4aacfdc 1050 lttng_relay_stop_threads();
b8aa1682
JD
1051 return NULL;
1052}
1053
b8aa1682 1054/*
7591bab1 1055 * Set index data from the control port to a given index object.
b8aa1682 1056 */
7591bab1 1057static int set_index_control_data(struct relay_index *index,
234cd636
JD
1058 struct lttcomm_relayd_index *data,
1059 struct relay_connection *conn)
1c20f0e2 1060{
7591bab1 1061 struct ctf_packet_index index_data;
1c20f0e2
JD
1062
1063 /*
5312a3ed 1064 * The index on disk is encoded in big endian.
1c20f0e2 1065 */
5312a3ed
JG
1066 index_data.packet_size = htobe64(data->packet_size);
1067 index_data.content_size = htobe64(data->content_size);
1068 index_data.timestamp_begin = htobe64(data->timestamp_begin);
1069 index_data.timestamp_end = htobe64(data->timestamp_end);
1070 index_data.events_discarded = htobe64(data->events_discarded);
1071 index_data.stream_id = htobe64(data->stream_id);
234cd636
JD
1072
1073 if (conn->minor >= 8) {
5312a3ed
JG
1074 index->index_data.stream_instance_id = htobe64(data->stream_instance_id);
1075 index->index_data.packet_seq_num = htobe64(data->packet_seq_num);
234cd636
JD
1076 }
1077
7591bab1 1078 return relay_index_set_data(index, &index_data);
1c20f0e2
JD
1079}
1080
298a25ca
JG
1081static bool session_streams_have_index(const struct relay_session *session)
1082{
1083 return session->minor >= 4 && !session->snapshot;
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;
4c6885d2 1097 struct relay_session *session = NULL;
1e791a74
JG
1098 struct lttcomm_relayd_status_session reply = {};
1099 char session_name[LTTNG_NAME_MAX] = {};
1100 char hostname[LTTNG_HOST_NAME_MAX] = {};
7591bab1
MD
1101 uint32_t live_timer = 0;
1102 bool snapshot = false;
23c8ff50
JG
1103 /* Left nil for peers < 2.11. */
1104 lttng_uuid sessiond_uuid = {};
1e791a74
JG
1105 LTTNG_OPTIONAL(uint64_t) id_sessiond = {};
1106 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
db1da059 1107 LTTNG_OPTIONAL(time_t) creation_time = {};
c5b6f4f0 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 1116 } else {
84fa4db5 1117 bool has_current_chunk;
db1da059
JG
1118 uint64_t current_chunk_id_value;
1119 time_t creation_time_value;
1120 uint64_t id_sessiond_value;
84fa4db5 1121
f86f6389 1122 /* From 2.11 to ... */
db1da059
JG
1123 ret = cmd_create_session_2_11(payload, session_name, hostname,
1124 &live_timer, &snapshot, &id_sessiond_value,
1125 sessiond_uuid, &has_current_chunk,
1126 &current_chunk_id_value, &creation_time_value);
23c8ff50
JG
1127 if (lttng_uuid_is_nil(sessiond_uuid)) {
1128 /* The nil UUID is reserved for pre-2.11 clients. */
1129 ERR("Illegal nil UUID announced by peer in create session command");
1130 ret = -1;
1131 goto send_reply;
1132 }
db1da059
JG
1133 LTTNG_OPTIONAL_SET(&id_sessiond, id_sessiond_value);
1134 LTTNG_OPTIONAL_SET(&creation_time, creation_time_value);
1135 if (has_current_chunk) {
1136 LTTNG_OPTIONAL_SET(&current_chunk_id,
1137 current_chunk_id_value);
1138 }
7591bab1 1139 }
f86f6389 1140
7591bab1
MD
1141 if (ret < 0) {
1142 goto send_reply;
d3e2ba59
JD
1143 }
1144
7591bab1 1145 session = session_create(session_name, hostname, live_timer,
1e791a74
JG
1146 snapshot, sessiond_uuid,
1147 id_sessiond.is_set ? &id_sessiond.value : NULL,
1148 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
db1da059 1149 creation_time.is_set ? &creation_time.value : NULL,
1e791a74 1150 conn->major, conn->minor);
7591bab1
MD
1151 if (!session) {
1152 ret = -1;
1153 goto send_reply;
1154 }
1155 assert(!conn->session);
1156 conn->session = session;
c5b6f4f0
DG
1157 DBG("Created session %" PRIu64, session->id);
1158
7591bab1
MD
1159 reply.session_id = htobe64(session->id);
1160
1161send_reply:
c5b6f4f0
DG
1162 if (ret < 0) {
1163 reply.ret_code = htobe32(LTTNG_ERR_FATAL);
1164 } else {
1165 reply.ret_code = htobe32(LTTNG_OK);
1166 }
1167
58eb9381 1168 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
1169 if (send_ret < (ssize_t) sizeof(reply)) {
1170 ERR("Failed to send \"create session\" command reply (ret = %zd)",
1171 send_ret);
1172 ret = -1;
c5b6f4f0 1173 }
4c6885d2
JG
1174 if (ret < 0 && session) {
1175 session_put(session);
1176 }
c5b6f4f0
DG
1177 return ret;
1178}
1179
a4baae1b
JD
1180/*
1181 * When we have received all the streams and the metadata for a channel,
1182 * we make them visible to the viewer threads.
1183 */
7591bab1 1184static void publish_connection_local_streams(struct relay_connection *conn)
a4baae1b 1185{
7591bab1
MD
1186 struct relay_stream *stream;
1187 struct relay_session *session = conn->session;
a4baae1b 1188
7591bab1
MD
1189 /*
1190 * We publish all streams belonging to a session atomically wrt
1191 * session lock.
1192 */
1193 pthread_mutex_lock(&session->lock);
1194 rcu_read_lock();
1195 cds_list_for_each_entry_rcu(stream, &session->recv_list,
1196 recv_node) {
1197 stream_publish(stream);
a4baae1b 1198 }
7591bab1 1199 rcu_read_unlock();
a4baae1b 1200
7591bab1
MD
1201 /*
1202 * Inform the viewer that there are new streams in the session.
1203 */
1204 if (session->viewer_attached) {
1205 uatomic_set(&session->new_streams, 1);
1206 }
1207 pthread_mutex_unlock(&session->lock);
a4baae1b
JD
1208}
1209
348a81dc
JG
1210static int conform_channel_path(char *channel_path)
1211{
1212 int ret = 0;
1213
1214 if (strstr("../", channel_path)) {
1215 ERR("Refusing channel path as it walks up the path hierarchy: \"%s\"",
1216 channel_path);
1217 ret = -1;
1218 goto end;
1219 }
1220
1221 if (*channel_path == '/') {
1222 const size_t len = strlen(channel_path);
1223
1224 /*
1225 * Channel paths from peers prior to 2.11 are expressed as an
1226 * absolute path that is, in reality, relative to the relay
1227 * daemon's output directory. Remove the leading slash so it
1228 * is correctly interpreted as a relative path later on.
1229 *
1230 * len (and not len - 1) is used to copy the trailing NULL.
1231 */
1232 bcopy(channel_path + 1, channel_path, len);
1233 }
1234end:
1235 return ret;
1236}
1237
b8aa1682
JD
1238/*
1239 * relay_add_stream: allocate a new stream for a session
1240 */
5312a3ed
JG
1241static int relay_add_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1242 struct relay_connection *conn,
1243 const struct lttng_buffer_view *payload)
b8aa1682 1244{
7591bab1
MD
1245 int ret;
1246 ssize_t send_ret;
58eb9381 1247 struct relay_session *session = conn->session;
b8aa1682
JD
1248 struct relay_stream *stream = NULL;
1249 struct lttcomm_relayd_status_stream reply;
4030a636 1250 struct ctf_trace *trace = NULL;
7591bab1
MD
1251 uint64_t stream_handle = -1ULL;
1252 char *path_name = NULL, *channel_name = NULL;
1253 uint64_t tracefile_size = 0, tracefile_count = 0;
348a81dc 1254 LTTNG_OPTIONAL(uint64_t) stream_chunk_id = {};
b8aa1682 1255
5312a3ed 1256 if (!session || !conn->version_check_done) {
b8aa1682
JD
1257 ERR("Trying to add a stream before version check");
1258 ret = -1;
1259 goto end_no_session;
1260 }
1261
2f21a469
JR
1262 if (session->minor == 1) {
1263 /* For 2.1 */
5312a3ed 1264 ret = cmd_recv_stream_2_1(payload, &path_name,
7591bab1 1265 &channel_name);
2f21a469
JR
1266 } else if (session->minor > 1 && session->minor < 11) {
1267 /* From 2.2 to 2.10 */
5312a3ed 1268 ret = cmd_recv_stream_2_2(payload, &path_name,
7591bab1 1269 &channel_name, &tracefile_size, &tracefile_count);
2f21a469
JR
1270 } else {
1271 /* From 2.11 to ... */
1272 ret = cmd_recv_stream_2_11(payload, &path_name,
0b50e4b3
JG
1273 &channel_name, &tracefile_size, &tracefile_count,
1274 &stream_chunk_id.value);
1275 stream_chunk_id.is_set = true;
0f907de1 1276 }
2f21a469 1277
0f907de1 1278 if (ret < 0) {
7591bab1 1279 goto send_reply;
b8aa1682
JD
1280 }
1281
348a81dc
JG
1282 if (conform_channel_path(path_name)) {
1283 goto send_reply;
1284 }
1285
7591bab1 1286 trace = ctf_trace_get_by_path_or_create(session, path_name);
2a174661 1287 if (!trace) {
7591bab1 1288 goto send_reply;
2a174661 1289 }
7591bab1 1290 /* This stream here has one reference on the trace. */
2a174661 1291
7591bab1
MD
1292 pthread_mutex_lock(&last_relay_stream_id_lock);
1293 stream_handle = ++last_relay_stream_id;
1294 pthread_mutex_unlock(&last_relay_stream_id_lock);
d3e2ba59 1295
7591bab1
MD
1296 /* We pass ownership of path_name and channel_name. */
1297 stream = stream_create(trace, stream_handle, path_name,
348a81dc 1298 channel_name, tracefile_size, tracefile_count);
7591bab1
MD
1299 path_name = NULL;
1300 channel_name = NULL;
a4baae1b 1301
2a174661 1302 /*
7591bab1
MD
1303 * Streams are the owners of their trace. Reference to trace is
1304 * kept within stream_create().
2a174661 1305 */
7591bab1 1306 ctf_trace_put(trace);
d3e2ba59 1307
7591bab1 1308send_reply:
53efb85a 1309 memset(&reply, 0, sizeof(reply));
7591bab1
MD
1310 reply.handle = htobe64(stream_handle);
1311 if (!stream) {
f73fabfd 1312 reply.ret_code = htobe32(LTTNG_ERR_UNK);
b8aa1682 1313 } else {
f73fabfd 1314 reply.ret_code = htobe32(LTTNG_OK);
b8aa1682 1315 }
5af40280 1316
58eb9381 1317 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
b8aa1682 1318 sizeof(struct lttcomm_relayd_status_stream), 0);
5312a3ed
JG
1319 if (send_ret < (ssize_t) sizeof(reply)) {
1320 ERR("Failed to send \"add stream\" command reply (ret = %zd)",
1321 send_ret);
1322 ret = -1;
b8aa1682
JD
1323 }
1324
1325end_no_session:
7591bab1
MD
1326 free(path_name);
1327 free(channel_name);
0f907de1 1328 return ret;
b8aa1682
JD
1329}
1330
173af62f
DG
1331/*
1332 * relay_close_stream: close a specific stream
1333 */
5312a3ed
JG
1334static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1335 struct relay_connection *conn,
1336 const struct lttng_buffer_view *payload)
173af62f 1337{
5312a3ed
JG
1338 int ret;
1339 ssize_t send_ret;
58eb9381 1340 struct relay_session *session = conn->session;
173af62f
DG
1341 struct lttcomm_relayd_close_stream stream_info;
1342 struct lttcomm_relayd_generic_reply reply;
1343 struct relay_stream *stream;
173af62f
DG
1344
1345 DBG("Close stream received");
1346
5312a3ed 1347 if (!session || !conn->version_check_done) {
173af62f
DG
1348 ERR("Trying to close a stream before version check");
1349 ret = -1;
1350 goto end_no_session;
1351 }
1352
5312a3ed
JG
1353 if (payload->size < sizeof(stream_info)) {
1354 ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
1355 sizeof(stream_info), payload->size);
173af62f
DG
1356 ret = -1;
1357 goto end_no_session;
1358 }
5312a3ed
JG
1359 memcpy(&stream_info, payload->data, sizeof(stream_info));
1360 stream_info.stream_id = be64toh(stream_info.stream_id);
1361 stream_info.last_net_seq_num = be64toh(stream_info.last_net_seq_num);
173af62f 1362
5312a3ed 1363 stream = stream_get_by_id(stream_info.stream_id);
173af62f
DG
1364 if (!stream) {
1365 ret = -1;
7591bab1 1366 goto end;
173af62f 1367 }
77f7bd85
MD
1368
1369 /*
1370 * Set last_net_seq_num before the close flag. Required by data
1371 * pending check.
1372 */
7591bab1 1373 pthread_mutex_lock(&stream->lock);
5312a3ed 1374 stream->last_net_seq_num = stream_info.last_net_seq_num;
77f7bd85
MD
1375 pthread_mutex_unlock(&stream->lock);
1376
bda7c7b9
JG
1377 /*
1378 * This is one of the conditions which may trigger a stream close
1379 * with the others being:
1380 * 1) A close command is received for a stream
1381 * 2) The control connection owning the stream is closed
1382 * 3) We have received all of the stream's data _after_ a close
1383 * request.
1384 */
1385 try_stream_close(stream);
7591bab1
MD
1386 if (stream->is_metadata) {
1387 struct relay_viewer_stream *vstream;
173af62f 1388
7591bab1
MD
1389 vstream = viewer_stream_get_by_id(stream->stream_handle);
1390 if (vstream) {
1391 if (vstream->metadata_sent == stream->metadata_received) {
1392 /*
1393 * Since all the metadata has been sent to the
1394 * viewer and that we have a request to close
1395 * its stream, we can safely teardown the
1396 * corresponding metadata viewer stream.
1397 */
1398 viewer_stream_put(vstream);
1399 }
1400 /* Put local reference. */
1401 viewer_stream_put(vstream);
1402 }
1403 }
7591bab1 1404 stream_put(stream);
5312a3ed 1405 ret = 0;
173af62f 1406
7591bab1 1407end:
53efb85a 1408 memset(&reply, 0, sizeof(reply));
173af62f 1409 if (ret < 0) {
f73fabfd 1410 reply.ret_code = htobe32(LTTNG_ERR_UNK);
173af62f 1411 } else {
f73fabfd 1412 reply.ret_code = htobe32(LTTNG_OK);
173af62f 1413 }
58eb9381 1414 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
173af62f 1415 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
1416 if (send_ret < (ssize_t) sizeof(reply)) {
1417 ERR("Failed to send \"close stream\" command reply (ret = %zd)",
1418 send_ret);
1419 ret = -1;
173af62f
DG
1420 }
1421
1422end_no_session:
1423 return ret;
1424}
1425
93ec662e
JD
1426/*
1427 * relay_reset_metadata: reset a metadata stream
1428 */
1429static
5312a3ed
JG
1430int relay_reset_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1431 struct relay_connection *conn,
1432 const struct lttng_buffer_view *payload)
93ec662e 1433{
5312a3ed
JG
1434 int ret;
1435 ssize_t send_ret;
93ec662e
JD
1436 struct relay_session *session = conn->session;
1437 struct lttcomm_relayd_reset_metadata stream_info;
1438 struct lttcomm_relayd_generic_reply reply;
1439 struct relay_stream *stream;
1440
1441 DBG("Reset metadata received");
1442
5312a3ed 1443 if (!session || !conn->version_check_done) {
93ec662e
JD
1444 ERR("Trying to reset a metadata stream before version check");
1445 ret = -1;
1446 goto end_no_session;
1447 }
1448
5312a3ed
JG
1449 if (payload->size < sizeof(stream_info)) {
1450 ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
1451 sizeof(stream_info), payload->size);
93ec662e
JD
1452 ret = -1;
1453 goto end_no_session;
1454 }
5312a3ed
JG
1455 memcpy(&stream_info, payload->data, sizeof(stream_info));
1456 stream_info.stream_id = be64toh(stream_info.stream_id);
1457 stream_info.version = be64toh(stream_info.version);
1458
1459 DBG("Update metadata to version %" PRIu64, stream_info.version);
93ec662e
JD
1460
1461 /* Unsupported for live sessions for now. */
1462 if (session->live_timer != 0) {
1463 ret = -1;
1464 goto end;
1465 }
1466
5312a3ed 1467 stream = stream_get_by_id(stream_info.stream_id);
93ec662e
JD
1468 if (!stream) {
1469 ret = -1;
1470 goto end;
1471 }
1472 pthread_mutex_lock(&stream->lock);
1473 if (!stream->is_metadata) {
1474 ret = -1;
1475 goto end_unlock;
1476 }
1477
1478 ret = utils_rotate_stream_file(stream->path_name, stream->channel_name,
1479 0, 0, -1, -1, stream->stream_fd->fd, NULL,
1480 &stream->stream_fd->fd);
1481 if (ret < 0) {
1482 ERR("Failed to rotate metadata file %s of channel %s",
1483 stream->path_name, stream->channel_name);
1484 goto end_unlock;
1485 }
1486
1487end_unlock:
1488 pthread_mutex_unlock(&stream->lock);
1489 stream_put(stream);
1490
1491end:
1492 memset(&reply, 0, sizeof(reply));
1493 if (ret < 0) {
1494 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1495 } else {
1496 reply.ret_code = htobe32(LTTNG_OK);
1497 }
1498 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1499 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
1500 if (send_ret < (ssize_t) sizeof(reply)) {
1501 ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
1502 send_ret);
1503 ret = -1;
93ec662e
JD
1504 }
1505
1506end_no_session:
1507 return ret;
1508}
1509
b8aa1682
JD
1510/*
1511 * relay_unknown_command: send -1 if received unknown command
1512 */
7591bab1 1513static void relay_unknown_command(struct relay_connection *conn)
b8aa1682
JD
1514{
1515 struct lttcomm_relayd_generic_reply reply;
5312a3ed 1516 ssize_t send_ret;
b8aa1682 1517
53efb85a 1518 memset(&reply, 0, sizeof(reply));
f73fabfd 1519 reply.ret_code = htobe32(LTTNG_ERR_UNK);
5312a3ed
JG
1520 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1521 if (send_ret < sizeof(reply)) {
1522 ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret);
b8aa1682
JD
1523 }
1524}
1525
1526/*
1527 * relay_start: send an acknowledgment to the client to tell if we are
1528 * ready to receive data. We are ready if a session is established.
1529 */
5312a3ed
JG
1530static int relay_start(const struct lttcomm_relayd_hdr *recv_hdr,
1531 struct relay_connection *conn,
1532 const struct lttng_buffer_view *payload)
b8aa1682 1533{
5312a3ed
JG
1534 int ret = 0;
1535 ssize_t send_ret;
b8aa1682 1536 struct lttcomm_relayd_generic_reply reply;
58eb9381 1537 struct relay_session *session = conn->session;
b8aa1682
JD
1538
1539 if (!session) {
1540 DBG("Trying to start the streaming without a session established");
f73fabfd 1541 ret = htobe32(LTTNG_ERR_UNK);
b8aa1682
JD
1542 }
1543
53efb85a 1544 memset(&reply, 0, sizeof(reply));
5312a3ed
JG
1545 reply.ret_code = htobe32(LTTNG_OK);
1546 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1547 sizeof(reply), 0);
1548 if (send_ret < (ssize_t) sizeof(reply)) {
1549 ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
1550 send_ret);
1551 ret = -1;
b8aa1682
JD
1552 }
1553
1554 return ret;
1555}
1556
1d4dfdef
DG
1557/*
1558 * Append padding to the file pointed by the file descriptor fd.
1559 */
1560static int write_padding_to_file(int fd, uint32_t size)
1561{
6cd525e8 1562 ssize_t ret = 0;
1d4dfdef
DG
1563 char *zeros;
1564
1565 if (size == 0) {
1566 goto end;
1567 }
1568
1569 zeros = zmalloc(size);
1570 if (zeros == NULL) {
1571 PERROR("zmalloc zeros for padding");
1572 ret = -1;
1573 goto end;
1574 }
1575
6cd525e8
MD
1576 ret = lttng_write(fd, zeros, size);
1577 if (ret < size) {
1d4dfdef
DG
1578 PERROR("write padding to file");
1579 }
1580
e986c7a1
DG
1581 free(zeros);
1582
1d4dfdef
DG
1583end:
1584 return ret;
1585}
1586
d3ecc550
JD
1587/*
1588 * Close the current index file if it is open, and create a new one.
1589 *
1590 * Return 0 on success, -1 on error.
1591 */
1592static
cb523e02 1593int create_rotate_index_file(struct relay_stream *stream,
348a81dc 1594 const char *channel_path)
d3ecc550
JD
1595{
1596 int ret;
1597 uint32_t major, minor;
1598
348a81dc
JG
1599 ASSERT_LOCKED(stream->lock);
1600
d3ecc550
JD
1601 /* Put ref on previous index_file. */
1602 if (stream->index_file) {
1603 lttng_index_file_put(stream->index_file);
1604 stream->index_file = NULL;
1605 }
1606 major = stream->trace->session->major;
1607 minor = stream->trace->session->minor;
348a81dc
JG
1608 if (!stream->trace->index_folder_created) {
1609 char *index_subpath = NULL;
1610
1611 ret = asprintf(&index_subpath, "%s/%s", channel_path, DEFAULT_INDEX_DIR);
1612 if (ret < 0) {
1613 goto end;
1614 }
1615
1616 ret = lttng_trace_chunk_create_subdirectory(stream->trace_chunk, index_subpath);
1617 free(index_subpath);
1618 if (ret) {
1619 goto end;
1620 }
1621 stream->trace->index_folder_created = true;
1622 }
1623 stream->index_file = lttng_index_file_create_from_trace_chunk(
1624 stream->trace_chunk, channel_path, stream->channel_name,
1625 stream->tracefile_size, stream->tracefile_count,
d3ecc550 1626 lttng_to_index_major(major, minor),
348a81dc 1627 lttng_to_index_minor(major, minor), true);
d3ecc550
JD
1628 if (!stream->index_file) {
1629 ret = -1;
1630 goto end;
1631 }
1632
1633 ret = 0;
1634
1635end:
1636 return ret;
1637}
1638
1639static
c6db3843 1640int do_rotate_stream_data(struct relay_stream *stream)
d3ecc550
JD
1641{
1642 int ret;
1643
c6db3843
JG
1644 DBG("Rotating stream %" PRIu64 " data file",
1645 stream->stream_handle);
d3ecc550
JD
1646 /* Perform the stream rotation. */
1647 ret = utils_rotate_stream_file(stream->path_name,
1648 stream->channel_name, stream->tracefile_size,
1649 stream->tracefile_count, -1,
1650 -1, stream->stream_fd->fd,
1651 NULL, &stream->stream_fd->fd);
1652 if (ret < 0) {
1653 ERR("Rotating stream output file");
1654 goto end;
1655 }
1656 stream->tracefile_size_current = 0;
d3ecc550 1657 stream->pos_after_last_complete_data_index = 0;
c6db3843 1658 stream->data_rotated = true;
d3ecc550 1659
c6db3843
JG
1660 if (stream->data_rotated && stream->index_rotated) {
1661 /* Rotation completed; reset its state. */
1662 DBG("Rotation completed for stream %" PRIu64,
1663 stream->stream_handle);
1664 stream->rotate_at_seq_num = -1ULL;
1665 stream->data_rotated = false;
1666 stream->index_rotated = false;
1667 }
d3ecc550
JD
1668end:
1669 return ret;
1670}
1671
1672/*
1673 * If too much data has been written in a tracefile before we received the
1674 * rotation command, we have to move the excess data to the new tracefile and
1675 * perform the rotation. This can happen because the control and data
1676 * connections are separate, the indexes as well as the commands arrive from
1677 * the control connection and we have no control over the order so we could be
1678 * in a situation where too much data has been received on the data connection
c6db3843 1679 * before the rotation command on the control connection arrives.
d3ecc550
JD
1680 */
1681static
1682int rotate_truncate_stream(struct relay_stream *stream)
1683{
1684 int ret, new_fd;
a5df8828 1685 off_t lseek_ret;
d3ecc550
JD
1686 uint64_t diff, pos = 0;
1687 char buf[FILE_COPY_BUFFER_SIZE];
1688
1689 assert(!stream->is_metadata);
1690
1691 assert(stream->tracefile_size_current >
1692 stream->pos_after_last_complete_data_index);
1693 diff = stream->tracefile_size_current -
1694 stream->pos_after_last_complete_data_index;
1695
1696 /* Create the new tracefile. */
1697 new_fd = utils_create_stream_file(stream->path_name,
1698 stream->channel_name,
1699 stream->tracefile_size, stream->tracefile_count,
1700 /* uid */ -1, /* gid */ -1, /* suffix */ NULL);
1701 if (new_fd < 0) {
1702 ERR("Failed to create new stream file at path %s for channel %s",
1703 stream->path_name, stream->channel_name);
1704 ret = -1;
1705 goto end;
1706 }
1707
1708 /*
1709 * Rewind the current tracefile to the position at which the rotation
a9577b76 1710 * should have occurred.
d3ecc550 1711 */
a5df8828 1712 lseek_ret = lseek(stream->stream_fd->fd,
d3ecc550 1713 stream->pos_after_last_complete_data_index, SEEK_SET);
a5df8828 1714 if (lseek_ret < 0) {
d3ecc550 1715 PERROR("seek truncate stream");
a5df8828 1716 ret = -1;
d3ecc550
JD
1717 goto end;
1718 }
1719
1720 /* Move data from the old file to the new file. */
1721 while (pos < diff) {
1722 uint64_t count, bytes_left;
1723 ssize_t io_ret;
1724
1725 bytes_left = diff - pos;
1726 count = bytes_left > sizeof(buf) ? sizeof(buf) : bytes_left;
1727 assert(count <= SIZE_MAX);
1728
1729 io_ret = lttng_read(stream->stream_fd->fd, buf, count);
1730 if (io_ret < (ssize_t) count) {
1731 char error_string[256];
1732
1733 snprintf(error_string, sizeof(error_string),
1734 "Failed to read %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1735 count, stream->stream_fd->fd, io_ret);
1736 if (io_ret == -1) {
1737 PERROR("%s", error_string);
1738 } else {
1739 ERR("%s", error_string);
1740 }
1741 ret = -1;
1742 goto end;
1743 }
1744
1745 io_ret = lttng_write(new_fd, buf, count);
1746 if (io_ret < (ssize_t) count) {
1747 char error_string[256];
1748
1749 snprintf(error_string, sizeof(error_string),
1750 "Failed to write %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1751 count, new_fd, io_ret);
1752 if (io_ret == -1) {
1753 PERROR("%s", error_string);
1754 } else {
1755 ERR("%s", error_string);
1756 }
1757 ret = -1;
1758 goto end;
1759 }
1760
1761 pos += count;
1762 }
1763
1764 /* Truncate the file to get rid of the excess data. */
1765 ret = ftruncate(stream->stream_fd->fd,
1766 stream->pos_after_last_complete_data_index);
1767 if (ret) {
1768 PERROR("ftruncate");
1769 goto end;
1770 }
1771
1772 ret = close(stream->stream_fd->fd);
1773 if (ret < 0) {
1774 PERROR("Closing tracefile");
1775 goto end;
1776 }
1777
d3ecc550
JD
1778 /*
1779 * Update the offset and FD of all the eventual indexes created by the
1780 * data connection before the rotation command arrived.
1781 */
1782 ret = relay_index_switch_all_files(stream);
1783 if (ret < 0) {
1784 ERR("Failed to rotate index file");
1785 goto end;
1786 }
1787
1788 stream->stream_fd->fd = new_fd;
1789 stream->tracefile_size_current = diff;
1790 stream->pos_after_last_complete_data_index = 0;
1791 stream->rotate_at_seq_num = -1ULL;
1792
1793 ret = 0;
1794
1795end:
1796 return ret;
1797}
1798
1799/*
c6db3843 1800 * Check if a stream's index file should be rotated (for session rotation).
d3ecc550
JD
1801 * Must be called with the stream lock held.
1802 *
1803 * Return 0 on success, a negative value on error.
1804 */
1805static
c6db3843 1806int try_rotate_stream_index(struct relay_stream *stream)
d3ecc550
JD
1807{
1808 int ret = 0;
1809
d3ecc550 1810 if (stream->rotate_at_seq_num == -1ULL) {
c6db3843 1811 /* No rotation expected. */
d3ecc550
JD
1812 goto end;
1813 }
1814
c6db3843
JG
1815 if (stream->index_rotated) {
1816 /* Rotation of the index has already occurred. */
1817 goto end;
1818 }
1819
1820 if (stream->prev_index_seq == -1ULL ||
1821 stream->prev_index_seq < stream->rotate_at_seq_num) {
1822 DBG("Stream %" PRIu64 " index not yet ready for rotation (rotate_at_seq_num = %" PRIu64 ", prev_index_seq = %" PRIu64 ")",
1823 stream->stream_handle,
1824 stream->rotate_at_seq_num,
1825 stream->prev_index_seq);
1826 goto end;
1827 } else if (stream->prev_index_seq != stream->rotate_at_seq_num) {
1828 /*
1829 * Unexpected, protocol error/bug.
1830 * It could mean that we received a rotation position
1831 * that is in the past.
1832 */
1833 ERR("Stream %" PRIu64 " index is in an inconsistent state (rotate_at_seq_num = %" PRIu64 ", prev_data_seq = %" PRIu64 ", prev_index_seq = %" PRIu64 ")",
c64c70f5
JG
1834 stream->stream_handle,
1835 stream->rotate_at_seq_num,
a8f9f353 1836 stream->prev_data_seq,
c64c70f5 1837 stream->prev_index_seq);
c6db3843
JG
1838 ret = -1;
1839 goto end;
1840 } else {
1841 DBG("Rotating stream %" PRIu64 " index file",
1842 stream->stream_handle);
1843 ret = create_rotate_index_file(stream, stream->path_name);
1844 stream->index_rotated = true;
1845
1846 if (stream->data_rotated && stream->index_rotated) {
1847 /* Rotation completed; reset its state. */
1848 DBG("Rotation completed for stream %" PRIu64,
1849 stream->stream_handle);
1850 stream->rotate_at_seq_num = -1ULL;
1851 stream->data_rotated = false;
1852 stream->index_rotated = false;
1853 }
1854 }
1855
1856end:
1857 return ret;
1858}
1859
1860/*
1861 * Check if a stream's data file (as opposed to index) should be rotated
1862 * (for session rotation).
1863 * Must be called with the stream lock held.
1864 *
1865 * Return 0 on success, a negative value on error.
1866 */
1867static
1868int try_rotate_stream_data(struct relay_stream *stream)
1869{
1870 int ret = 0;
1871
1872 if (stream->rotate_at_seq_num == -1ULL) {
1873 /* No rotation expected. */
1874 goto end;
1875 }
1876
1877 if (stream->data_rotated) {
1878 /* Rotation of the data file has already occurred. */
1879 goto end;
1880 }
1881
1882 if (stream->prev_data_seq == -1ULL ||
1883 stream->prev_data_seq < stream->rotate_at_seq_num) {
1884 DBG("Stream %" PRIu64 " not yet ready for rotation (rotate_at_seq_num = %" PRIu64 ", prev_data_seq = %" PRIu64 ")",
1885 stream->stream_handle,
1886 stream->rotate_at_seq_num,
1887 stream->prev_data_seq);
d3ecc550 1888 goto end;
a8f9f353 1889 } else if (stream->prev_data_seq > stream->rotate_at_seq_num) {
c64c70f5 1890 /*
a8f9f353 1891 * prev_data_seq is checked here since indexes and rotation
c64c70f5
JG
1892 * commands are serialized with respect to each other.
1893 */
d3ecc550
JD
1894 DBG("Rotation after too much data has been written in tracefile "
1895 "for stream %" PRIu64 ", need to truncate before "
1896 "rotating", stream->stream_handle);
1897 ret = rotate_truncate_stream(stream);
1898 if (ret) {
1899 ERR("Failed to truncate stream");
1900 goto end;
1901 }
c6db3843
JG
1902 } else if (stream->prev_data_seq != stream->rotate_at_seq_num) {
1903 /*
1904 * Unexpected, protocol error/bug.
1905 * It could mean that we received a rotation position
1906 * that is in the past.
1907 */
1908 ERR("Stream %" PRIu64 " data is in an inconsistent state (rotate_at_seq_num = %" PRIu64 ", prev_data_seq = %" PRIu64 ")",
c64c70f5
JG
1909 stream->stream_handle,
1910 stream->rotate_at_seq_num,
c6db3843
JG
1911 stream->prev_data_seq);
1912 ret = -1;
1913 goto end;
1914 } else {
1915 ret = do_rotate_stream_data(stream);
d3ecc550
JD
1916 }
1917
1918end:
1919 return ret;
1920}
1921
b8aa1682 1922/*
7591bab1 1923 * relay_recv_metadata: receive the metadata for the session.
b8aa1682 1924 */
5312a3ed
JG
1925static int relay_recv_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1926 struct relay_connection *conn,
1927 const struct lttng_buffer_view *payload)
b8aa1682 1928{
32d1569c 1929 int ret = 0;
6cd525e8 1930 ssize_t size_ret;
58eb9381 1931 struct relay_session *session = conn->session;
5312a3ed 1932 struct lttcomm_relayd_metadata_payload metadata_payload_header;
b8aa1682 1933 struct relay_stream *metadata_stream;
5312a3ed 1934 uint64_t metadata_payload_size;
b8aa1682
JD
1935
1936 if (!session) {
1937 ERR("Metadata sent before version check");
1938 ret = -1;
1939 goto end;
1940 }
1941
5312a3ed 1942 if (recv_hdr->data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
f6416125
MD
1943 ERR("Incorrect data size");
1944 ret = -1;
1945 goto end;
1946 }
5312a3ed
JG
1947 metadata_payload_size = recv_hdr->data_size -
1948 sizeof(struct lttcomm_relayd_metadata_payload);
f6416125 1949
5312a3ed
JG
1950 memcpy(&metadata_payload_header, payload->data,
1951 sizeof(metadata_payload_header));
1952 metadata_payload_header.stream_id = be64toh(
1953 metadata_payload_header.stream_id);
1954 metadata_payload_header.padding_size = be32toh(
1955 metadata_payload_header.padding_size);
9d1bbf21 1956
5312a3ed 1957 metadata_stream = stream_get_by_id(metadata_payload_header.stream_id);
b8aa1682
JD
1958 if (!metadata_stream) {
1959 ret = -1;
7591bab1 1960 goto end;
b8aa1682
JD
1961 }
1962
7591bab1
MD
1963 pthread_mutex_lock(&metadata_stream->lock);
1964
5312a3ed
JG
1965 size_ret = lttng_write(metadata_stream->stream_fd->fd,
1966 payload->data + sizeof(metadata_payload_header),
1967 metadata_payload_size);
1968 if (size_ret < metadata_payload_size) {
b8aa1682
JD
1969 ERR("Relay error writing metadata on file");
1970 ret = -1;
7591bab1 1971 goto end_put;
b8aa1682 1972 }
1d4dfdef 1973
32d1569c 1974 size_ret = write_padding_to_file(metadata_stream->stream_fd->fd,
5312a3ed 1975 metadata_payload_header.padding_size);
715e6fb1 1976 if (size_ret < (int64_t) metadata_payload_header.padding_size) {
5312a3ed 1977 ret = -1;
7591bab1 1978 goto end_put;
1d4dfdef 1979 }
2a174661 1980
7591bab1 1981 metadata_stream->metadata_received +=
5312a3ed 1982 metadata_payload_size + metadata_payload_header.padding_size;
7591bab1
MD
1983 DBG2("Relay metadata written. Updated metadata_received %" PRIu64,
1984 metadata_stream->metadata_received);
1d4dfdef 1985
c6db3843 1986 ret = try_rotate_stream_data(metadata_stream);
d3ecc550
JD
1987 if (ret < 0) {
1988 goto end_put;
1989 }
1990
7591bab1
MD
1991end_put:
1992 pthread_mutex_unlock(&metadata_stream->lock);
1993 stream_put(metadata_stream);
b8aa1682
JD
1994end:
1995 return ret;
1996}
1997
1998/*
1999 * relay_send_version: send relayd version number
2000 */
5312a3ed
JG
2001static int relay_send_version(const struct lttcomm_relayd_hdr *recv_hdr,
2002 struct relay_connection *conn,
2003 const struct lttng_buffer_view *payload)
b8aa1682 2004{
7f51dcba 2005 int ret;
5312a3ed 2006 ssize_t send_ret;
092b6259 2007 struct lttcomm_relayd_version reply, msg;
87cb6359 2008 bool compatible = true;
b8aa1682 2009
5312a3ed 2010 conn->version_check_done = true;
b8aa1682 2011
092b6259 2012 /* Get version from the other side. */
5312a3ed
JG
2013 if (payload->size < sizeof(msg)) {
2014 ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
2015 sizeof(msg), payload->size);
092b6259 2016 ret = -1;
092b6259
DG
2017 goto end;
2018 }
2019
5312a3ed
JG
2020 memcpy(&msg, payload->data, sizeof(msg));
2021 msg.major = be32toh(msg.major);
2022 msg.minor = be32toh(msg.minor);
2023
53efb85a 2024 memset(&reply, 0, sizeof(reply));
d83a952c
MD
2025 reply.major = RELAYD_VERSION_COMM_MAJOR;
2026 reply.minor = RELAYD_VERSION_COMM_MINOR;
d4519fa3
JD
2027
2028 /* Major versions must be the same */
5312a3ed 2029 if (reply.major != msg.major) {
6151a90f 2030 DBG("Incompatible major versions (%u vs %u), deleting session",
5312a3ed 2031 reply.major, msg.major);
87cb6359 2032 compatible = false;
d4519fa3
JD
2033 }
2034
58eb9381 2035 conn->major = reply.major;
0f907de1 2036 /* We adapt to the lowest compatible version */
5312a3ed 2037 if (reply.minor <= msg.minor) {
58eb9381 2038 conn->minor = reply.minor;
0f907de1 2039 } else {
5312a3ed 2040 conn->minor = msg.minor;
0f907de1
JD
2041 }
2042
6151a90f
JD
2043 reply.major = htobe32(reply.major);
2044 reply.minor = htobe32(reply.minor);
5312a3ed
JG
2045 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2046 sizeof(reply), 0);
2047 if (send_ret < (ssize_t) sizeof(reply)) {
2048 ERR("Failed to send \"send version\" command reply (ret = %zd)",
2049 send_ret);
2050 ret = -1;
2051 goto end;
2052 } else {
2053 ret = 0;
6151a90f
JD
2054 }
2055
87cb6359
JD
2056 if (!compatible) {
2057 ret = -1;
2058 goto end;
2059 }
2060
58eb9381
DG
2061 DBG("Version check done using protocol %u.%u", conn->major,
2062 conn->minor);
b8aa1682
JD
2063
2064end:
2065 return ret;
2066}
2067
c8f59ee5 2068/*
6d805429 2069 * Check for data pending for a given stream id from the session daemon.
c8f59ee5 2070 */
5312a3ed
JG
2071static int relay_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2072 struct relay_connection *conn,
2073 const struct lttng_buffer_view *payload)
c8f59ee5 2074{
58eb9381 2075 struct relay_session *session = conn->session;
6d805429 2076 struct lttcomm_relayd_data_pending msg;
c8f59ee5
DG
2077 struct lttcomm_relayd_generic_reply reply;
2078 struct relay_stream *stream;
5312a3ed 2079 ssize_t send_ret;
c8f59ee5 2080 int ret;
298a25ca 2081 uint64_t stream_seq;
c8f59ee5 2082
6d805429 2083 DBG("Data pending command received");
c8f59ee5 2084
5312a3ed 2085 if (!session || !conn->version_check_done) {
c8f59ee5
DG
2086 ERR("Trying to check for data before version check");
2087 ret = -1;
2088 goto end_no_session;
2089 }
2090
5312a3ed
JG
2091 if (payload->size < sizeof(msg)) {
2092 ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
2093 sizeof(msg), payload->size);
c8f59ee5
DG
2094 ret = -1;
2095 goto end_no_session;
2096 }
5312a3ed
JG
2097 memcpy(&msg, payload->data, sizeof(msg));
2098 msg.stream_id = be64toh(msg.stream_id);
2099 msg.last_net_seq_num = be64toh(msg.last_net_seq_num);
c8f59ee5 2100
5312a3ed 2101 stream = stream_get_by_id(msg.stream_id);
de91f48a 2102 if (stream == NULL) {
c8f59ee5 2103 ret = -1;
7591bab1 2104 goto end;
c8f59ee5
DG
2105 }
2106
7591bab1
MD
2107 pthread_mutex_lock(&stream->lock);
2108
298a25ca
JG
2109 if (session_streams_have_index(session)) {
2110 /*
2111 * Ensure that both the index and stream data have been
2112 * flushed up to the requested point.
2113 */
a8f9f353 2114 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 2115 } else {
a8f9f353 2116 stream_seq = stream->prev_data_seq;
298a25ca 2117 }
a8f9f353 2118 DBG("Data pending for stream id %" PRIu64 ": prev_data_seq %" PRIu64
298a25ca
JG
2119 ", prev_index_seq %" PRIu64
2120 ", and last_seq %" PRIu64, msg.stream_id,
a8f9f353 2121 stream->prev_data_seq, stream->prev_index_seq,
298a25ca 2122 msg.last_net_seq_num);
c8f59ee5 2123
33832e64 2124 /* Avoid wrapping issue */
298a25ca 2125 if (((int64_t) (stream_seq - msg.last_net_seq_num)) >= 0) {
6d805429 2126 /* Data has in fact been written and is NOT pending */
c8f59ee5 2127 ret = 0;
6d805429
DG
2128 } else {
2129 /* Data still being streamed thus pending */
2130 ret = 1;
c8f59ee5
DG
2131 }
2132
7591bab1
MD
2133 stream->data_pending_check_done = true;
2134 pthread_mutex_unlock(&stream->lock);
f7079f67 2135
7591bab1
MD
2136 stream_put(stream);
2137end:
c8f59ee5 2138
53efb85a 2139 memset(&reply, 0, sizeof(reply));
c8f59ee5 2140 reply.ret_code = htobe32(ret);
5312a3ed
JG
2141 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2142 if (send_ret < (ssize_t) sizeof(reply)) {
2143 ERR("Failed to send \"data pending\" command reply (ret = %zd)",
2144 send_ret);
2145 ret = -1;
c8f59ee5
DG
2146 }
2147
2148end_no_session:
2149 return ret;
2150}
2151
2152/*
2153 * Wait for the control socket to reach a quiescent state.
2154 *
7591bab1
MD
2155 * Note that for now, when receiving this command from the session
2156 * daemon, this means that every subsequent commands or data received on
2157 * the control socket has been handled. So, this is why we simply return
2158 * OK here.
c8f59ee5 2159 */
5312a3ed
JG
2160static int relay_quiescent_control(const struct lttcomm_relayd_hdr *recv_hdr,
2161 struct relay_connection *conn,
2162 const struct lttng_buffer_view *payload)
c8f59ee5
DG
2163{
2164 int ret;
5312a3ed 2165 ssize_t send_ret;
ad7051c0 2166 struct relay_stream *stream;
ad7051c0 2167 struct lttcomm_relayd_quiescent_control msg;
c8f59ee5
DG
2168 struct lttcomm_relayd_generic_reply reply;
2169
2170 DBG("Checking quiescent state on control socket");
2171
5312a3ed 2172 if (!conn->session || !conn->version_check_done) {
ad7051c0
DG
2173 ERR("Trying to check for data before version check");
2174 ret = -1;
2175 goto end_no_session;
2176 }
2177
5312a3ed
JG
2178 if (payload->size < sizeof(msg)) {
2179 ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
2180 sizeof(msg), payload->size);
ad7051c0
DG
2181 ret = -1;
2182 goto end_no_session;
2183 }
5312a3ed
JG
2184 memcpy(&msg, payload->data, sizeof(msg));
2185 msg.stream_id = be64toh(msg.stream_id);
ad7051c0 2186
5312a3ed 2187 stream = stream_get_by_id(msg.stream_id);
7591bab1
MD
2188 if (!stream) {
2189 goto reply;
2190 }
2191 pthread_mutex_lock(&stream->lock);
2192 stream->data_pending_check_done = true;
2193 pthread_mutex_unlock(&stream->lock);
5312a3ed
JG
2194
2195 DBG("Relay quiescent control pending flag set to %" PRIu64, msg.stream_id);
7591bab1
MD
2196 stream_put(stream);
2197reply:
53efb85a 2198 memset(&reply, 0, sizeof(reply));
c8f59ee5 2199 reply.ret_code = htobe32(LTTNG_OK);
5312a3ed
JG
2200 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2201 if (send_ret < (ssize_t) sizeof(reply)) {
2202 ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
2203 send_ret);
2204 ret = -1;
2205 } else {
2206 ret = 0;
c8f59ee5
DG
2207 }
2208
ad7051c0 2209end_no_session:
c8f59ee5
DG
2210 return ret;
2211}
2212
f7079f67 2213/*
7591bab1
MD
2214 * Initialize a data pending command. This means that a consumer is about
2215 * to ask for data pending for each stream it holds. Simply iterate over
2216 * all streams of a session and set the data_pending_check_done flag.
f7079f67
DG
2217 *
2218 * This command returns to the client a LTTNG_OK code.
2219 */
5312a3ed
JG
2220static int relay_begin_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2221 struct relay_connection *conn,
2222 const struct lttng_buffer_view *payload)
f7079f67
DG
2223{
2224 int ret;
5312a3ed 2225 ssize_t send_ret;
f7079f67
DG
2226 struct lttng_ht_iter iter;
2227 struct lttcomm_relayd_begin_data_pending msg;
2228 struct lttcomm_relayd_generic_reply reply;
2229 struct relay_stream *stream;
f7079f67
DG
2230
2231 assert(recv_hdr);
58eb9381 2232 assert(conn);
f7079f67
DG
2233
2234 DBG("Init streams for data pending");
2235
5312a3ed 2236 if (!conn->session || !conn->version_check_done) {
f7079f67
DG
2237 ERR("Trying to check for data before version check");
2238 ret = -1;
2239 goto end_no_session;
2240 }
2241
5312a3ed
JG
2242 if (payload->size < sizeof(msg)) {
2243 ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
2244 sizeof(msg), payload->size);
f7079f67
DG
2245 ret = -1;
2246 goto end_no_session;
2247 }
5312a3ed
JG
2248 memcpy(&msg, payload->data, sizeof(msg));
2249 msg.session_id = be64toh(msg.session_id);
f7079f67
DG
2250
2251 /*
7591bab1
MD
2252 * Iterate over all streams to set the begin data pending flag.
2253 * For now, the streams are indexed by stream handle so we have
2254 * to iterate over all streams to find the one associated with
2255 * the right session_id.
f7079f67
DG
2256 */
2257 rcu_read_lock();
d3e2ba59 2258 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2259 node.node) {
7591bab1
MD
2260 if (!stream_get(stream)) {
2261 continue;
2262 }
5312a3ed 2263 if (stream->trace->session->id == msg.session_id) {
7591bab1
MD
2264 pthread_mutex_lock(&stream->lock);
2265 stream->data_pending_check_done = false;
2266 pthread_mutex_unlock(&stream->lock);
f7079f67
DG
2267 DBG("Set begin data pending flag to stream %" PRIu64,
2268 stream->stream_handle);
2269 }
7591bab1 2270 stream_put(stream);
f7079f67
DG
2271 }
2272 rcu_read_unlock();
2273
53efb85a 2274 memset(&reply, 0, sizeof(reply));
f7079f67
DG
2275 /* All good, send back reply. */
2276 reply.ret_code = htobe32(LTTNG_OK);
2277
5312a3ed
JG
2278 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2279 if (send_ret < (ssize_t) sizeof(reply)) {
2280 ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
2281 send_ret);
2282 ret = -1;
2283 } else {
2284 ret = 0;
f7079f67
DG
2285 }
2286
2287end_no_session:
2288 return ret;
2289}
2290
2291/*
7591bab1
MD
2292 * End data pending command. This will check, for a given session id, if
2293 * each stream associated with it has its data_pending_check_done flag
2294 * set. If not, this means that the client lost track of the stream but
2295 * the data is still being streamed on our side. In this case, we inform
2296 * the client that data is in flight.
f7079f67
DG
2297 *
2298 * Return to the client if there is data in flight or not with a ret_code.
2299 */
5312a3ed
JG
2300static int relay_end_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2301 struct relay_connection *conn,
2302 const struct lttng_buffer_view *payload)
f7079f67
DG
2303{
2304 int ret;
5312a3ed 2305 ssize_t send_ret;
f7079f67
DG
2306 struct lttng_ht_iter iter;
2307 struct lttcomm_relayd_end_data_pending msg;
2308 struct lttcomm_relayd_generic_reply reply;
2309 struct relay_stream *stream;
f7079f67
DG
2310 uint32_t is_data_inflight = 0;
2311
f7079f67
DG
2312 DBG("End data pending command");
2313
5312a3ed 2314 if (!conn->session || !conn->version_check_done) {
f7079f67
DG
2315 ERR("Trying to check for data before version check");
2316 ret = -1;
2317 goto end_no_session;
2318 }
2319
5312a3ed
JG
2320 if (payload->size < sizeof(msg)) {
2321 ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
2322 sizeof(msg), payload->size);
f7079f67
DG
2323 ret = -1;
2324 goto end_no_session;
2325 }
5312a3ed
JG
2326 memcpy(&msg, payload->data, sizeof(msg));
2327 msg.session_id = be64toh(msg.session_id);
f7079f67 2328
7591bab1
MD
2329 /*
2330 * Iterate over all streams to see if the begin data pending
2331 * flag is set.
2332 */
f7079f67 2333 rcu_read_lock();
d3e2ba59 2334 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2335 node.node) {
7591bab1
MD
2336 if (!stream_get(stream)) {
2337 continue;
2338 }
5312a3ed 2339 if (stream->trace->session->id != msg.session_id) {
7591bab1
MD
2340 stream_put(stream);
2341 continue;
2342 }
2343 pthread_mutex_lock(&stream->lock);
2344 if (!stream->data_pending_check_done) {
298a25ca
JG
2345 uint64_t stream_seq;
2346
2347 if (session_streams_have_index(conn->session)) {
2348 /*
2349 * Ensure that both the index and stream data have been
2350 * flushed up to the requested point.
2351 */
a8f9f353 2352 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 2353 } else {
a8f9f353 2354 stream_seq = stream->prev_data_seq;
298a25ca
JG
2355 }
2356 if (!stream->closed || !(((int64_t) (stream_seq - stream->last_net_seq_num)) >= 0)) {
7591bab1
MD
2357 is_data_inflight = 1;
2358 DBG("Data is still in flight for stream %" PRIu64,
2359 stream->stream_handle);
2360 pthread_mutex_unlock(&stream->lock);
2361 stream_put(stream);
2362 break;
2363 }
f7079f67 2364 }
7591bab1
MD
2365 pthread_mutex_unlock(&stream->lock);
2366 stream_put(stream);
f7079f67
DG
2367 }
2368 rcu_read_unlock();
2369
53efb85a 2370 memset(&reply, 0, sizeof(reply));
f7079f67
DG
2371 /* All good, send back reply. */
2372 reply.ret_code = htobe32(is_data_inflight);
2373
5312a3ed
JG
2374 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2375 if (send_ret < (ssize_t) sizeof(reply)) {
2376 ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
2377 send_ret);
2378 ret = -1;
2379 } else {
2380 ret = 0;
f7079f67
DG
2381 }
2382
2383end_no_session:
2384 return ret;
2385}
2386
1c20f0e2
JD
2387/*
2388 * Receive an index for a specific stream.
2389 *
2390 * Return 0 on success else a negative value.
2391 */
5312a3ed
JG
2392static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
2393 struct relay_connection *conn,
2394 const struct lttng_buffer_view *payload)
1c20f0e2 2395{
5312a3ed
JG
2396 int ret;
2397 ssize_t send_ret;
58eb9381 2398 struct relay_session *session = conn->session;
1c20f0e2 2399 struct lttcomm_relayd_index index_info;
7591bab1 2400 struct relay_index *index;
1c20f0e2
JD
2401 struct lttcomm_relayd_generic_reply reply;
2402 struct relay_stream *stream;
f8f3885c 2403 size_t msg_len;
1c20f0e2 2404
58eb9381 2405 assert(conn);
1c20f0e2
JD
2406
2407 DBG("Relay receiving index");
2408
5312a3ed 2409 if (!session || !conn->version_check_done) {
1c20f0e2
JD
2410 ERR("Trying to close a stream before version check");
2411 ret = -1;
2412 goto end_no_session;
2413 }
2414
f8f3885c
MD
2415 msg_len = lttcomm_relayd_index_len(
2416 lttng_to_index_major(conn->major, conn->minor),
2417 lttng_to_index_minor(conn->major, conn->minor));
5312a3ed
JG
2418 if (payload->size < msg_len) {
2419 ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
2420 msg_len, payload->size);
1c20f0e2
JD
2421 ret = -1;
2422 goto end_no_session;
2423 }
5312a3ed
JG
2424 memcpy(&index_info, payload->data, msg_len);
2425 index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
2426 index_info.net_seq_num = be64toh(index_info.net_seq_num);
2427 index_info.packet_size = be64toh(index_info.packet_size);
2428 index_info.content_size = be64toh(index_info.content_size);
2429 index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
2430 index_info.timestamp_end = be64toh(index_info.timestamp_end);
2431 index_info.events_discarded = be64toh(index_info.events_discarded);
2432 index_info.stream_id = be64toh(index_info.stream_id);
81df238b
JR
2433
2434 if (conn->minor >= 8) {
2435 index_info.stream_instance_id =
2436 be64toh(index_info.stream_instance_id);
2437 index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
2438 }
5312a3ed
JG
2439
2440 stream = stream_get_by_id(index_info.relay_stream_id);
1c20f0e2 2441 if (!stream) {
7591bab1 2442 ERR("stream_get_by_id not found");
1c20f0e2 2443 ret = -1;
7591bab1 2444 goto end;
1c20f0e2 2445 }
7591bab1 2446 pthread_mutex_lock(&stream->lock);
1c20f0e2 2447
d3e2ba59
JD
2448 /* Live beacon handling */
2449 if (index_info.packet_size == 0) {
7591bab1
MD
2450 DBG("Received live beacon for stream %" PRIu64,
2451 stream->stream_handle);
d3e2ba59
JD
2452
2453 /*
7591bab1
MD
2454 * Only flag a stream inactive when it has already
2455 * received data and no indexes are in flight.
d3e2ba59 2456 */
a44ca2ca 2457 if (stream->index_received_seqcount > 0
7591bab1 2458 && stream->indexes_in_flight == 0) {
5312a3ed 2459 stream->beacon_ts_end = index_info.timestamp_end;
d3e2ba59
JD
2460 }
2461 ret = 0;
7591bab1 2462 goto end_stream_put;
d3e2ba59
JD
2463 } else {
2464 stream->beacon_ts_end = -1ULL;
2465 }
2466
528f2ffa 2467 if (stream->ctf_stream_id == -1ULL) {
5312a3ed 2468 stream->ctf_stream_id = index_info.stream_id;
528f2ffa 2469 }
5312a3ed 2470 index = relay_index_get_by_id_or_create(stream, index_info.net_seq_num);
7591bab1
MD
2471 if (!index) {
2472 ret = -1;
2473 ERR("relay_index_get_by_id_or_create index NULL");
2474 goto end_stream_put;
1c20f0e2 2475 }
234cd636 2476 if (set_index_control_data(index, &index_info, conn)) {
7591bab1
MD
2477 ERR("set_index_control_data error");
2478 relay_index_put(index);
2479 ret = -1;
2480 goto end_stream_put;
2481 }
2482 ret = relay_index_try_flush(index);
2483 if (ret == 0) {
a44ca2ca
MD
2484 tracefile_array_commit_seq(stream->tfa);
2485 stream->index_received_seqcount++;
d3ecc550 2486 stream->pos_after_last_complete_data_index += index->total_size;
7a45c7e6 2487 stream->prev_index_seq = index_info.net_seq_num;
c6db3843
JG
2488
2489 ret = try_rotate_stream_index(stream);
2490 if (ret < 0) {
2491 goto end_stream_put;
2492 }
7591bab1
MD
2493 } else if (ret > 0) {
2494 /* no flush. */
2495 ret = 0;
2496 } else {
245f8bec
JR
2497 /*
2498 * ret < 0
2499 *
2500 * relay_index_try_flush is responsible for the self-reference
2501 * put of the index object on error.
2502 */
7591bab1 2503 ERR("relay_index_try_flush error %d", ret);
7591bab1 2504 ret = -1;
1c20f0e2
JD
2505 }
2506
7591bab1
MD
2507end_stream_put:
2508 pthread_mutex_unlock(&stream->lock);
2509 stream_put(stream);
2510
2511end:
1c20f0e2 2512
53efb85a 2513 memset(&reply, 0, sizeof(reply));
1c20f0e2
JD
2514 if (ret < 0) {
2515 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2516 } else {
2517 reply.ret_code = htobe32(LTTNG_OK);
2518 }
58eb9381 2519 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
2520 if (send_ret < (ssize_t) sizeof(reply)) {
2521 ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
2522 ret = -1;
1c20f0e2
JD
2523 }
2524
2525end_no_session:
2526 return ret;
2527}
2528
a4baae1b
JD
2529/*
2530 * Receive the streams_sent message.
2531 *
2532 * Return 0 on success else a negative value.
2533 */
5312a3ed
JG
2534static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
2535 struct relay_connection *conn,
2536 const struct lttng_buffer_view *payload)
a4baae1b 2537{
5312a3ed
JG
2538 int ret;
2539 ssize_t send_ret;
a4baae1b
JD
2540 struct lttcomm_relayd_generic_reply reply;
2541
58eb9381 2542 assert(conn);
a4baae1b
JD
2543
2544 DBG("Relay receiving streams_sent");
2545
5312a3ed 2546 if (!conn->session || !conn->version_check_done) {
a4baae1b
JD
2547 ERR("Trying to close a stream before version check");
2548 ret = -1;
2549 goto end_no_session;
2550 }
2551
2552 /*
7591bab1
MD
2553 * Publish every pending stream in the connection recv list which are
2554 * now ready to be used by the viewer.
4a9daf17 2555 */
7591bab1 2556 publish_connection_local_streams(conn);
4a9daf17 2557
53efb85a 2558 memset(&reply, 0, sizeof(reply));
a4baae1b 2559 reply.ret_code = htobe32(LTTNG_OK);
58eb9381 2560 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
2561 if (send_ret < (ssize_t) sizeof(reply)) {
2562 ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
2563 send_ret);
2564 ret = -1;
a4baae1b
JD
2565 } else {
2566 /* Success. */
2567 ret = 0;
2568 }
2569
2570end_no_session:
2571 return ret;
2572}
2573
d3ecc550 2574/*
5312a3ed 2575 * relay_rotate_session_stream: rotate a stream to a new tracefile for the session
d3ecc550
JD
2576 * rotation feature (not the tracefile rotation feature).
2577 */
5312a3ed
JG
2578static int relay_rotate_session_stream(const struct lttcomm_relayd_hdr *recv_hdr,
2579 struct relay_connection *conn,
2580 const struct lttng_buffer_view *payload)
d3ecc550 2581{
5312a3ed
JG
2582 int ret;
2583 ssize_t send_ret;
d3ecc550
JD
2584 struct relay_session *session = conn->session;
2585 struct lttcomm_relayd_rotate_stream stream_info;
2586 struct lttcomm_relayd_generic_reply reply;
2587 struct relay_stream *stream;
5312a3ed
JG
2588 size_t header_len;
2589 size_t path_len;
2590 struct lttng_buffer_view new_path_view;
d3ecc550 2591
d3ecc550
JD
2592 if (!session || !conn->version_check_done) {
2593 ERR("Trying to rotate a stream before version check");
2594 ret = -1;
2595 goto end_no_reply;
2596 }
2597
2598 if (session->major == 2 && session->minor < 11) {
2599 ERR("Unsupported feature before 2.11");
2600 ret = -1;
2601 goto end_no_reply;
2602 }
2603
5312a3ed 2604 header_len = sizeof(struct lttcomm_relayd_rotate_stream);
d3ecc550 2605
5312a3ed
JG
2606 if (payload->size < header_len) {
2607 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
2608 header_len, payload->size);
d3ecc550
JD
2609 ret = -1;
2610 goto end_no_reply;
2611 }
2612
5312a3ed
JG
2613 memcpy(&stream_info, payload->data, header_len);
2614
2615 /* Convert to host */
2616 stream_info.pathname_length = be32toh(stream_info.pathname_length);
2617 stream_info.stream_id = be64toh(stream_info.stream_id);
2618 stream_info.new_chunk_id = be64toh(stream_info.new_chunk_id);
2619 stream_info.rotate_at_seq_num = be64toh(stream_info.rotate_at_seq_num);
d3ecc550 2620
5312a3ed
JG
2621 path_len = stream_info.pathname_length;
2622 if (payload->size < header_len + path_len) {
2623 ERR("Unexpected payload size in \"relay_rotate_session_stream\" including path: expected >= %zu bytes, got %zu bytes",
2624 header_len + path_len, payload->size);
2625 ret = -1;
2626 goto end_no_reply;
2627 }
2628
d3ecc550 2629 /* Ensure it fits in local filename length. */
5312a3ed 2630 if (path_len >= LTTNG_PATH_MAX) {
d3ecc550
JD
2631 ret = -ENAMETOOLONG;
2632 ERR("Length of relay_rotate_session_stream command's path name (%zu bytes) exceeds the maximal allowed length of %i bytes",
5312a3ed 2633 path_len, LTTNG_PATH_MAX);
d3ecc550
JD
2634 goto end;
2635 }
2636
5312a3ed
JG
2637 new_path_view = lttng_buffer_view_from_view(payload, header_len,
2638 stream_info.pathname_length);
d3ecc550 2639
5312a3ed
JG
2640 stream = stream_get_by_id(stream_info.stream_id);
2641 if (!stream) {
d3ecc550 2642 ret = -1;
5312a3ed 2643 goto end;
d3ecc550
JD
2644 }
2645
2646 pthread_mutex_lock(&stream->lock);
2647
2648 /*
2649 * Update the trace path (just the folder, the stream name does not
2650 * change).
2651 */
cb523e02
JG
2652 free(stream->prev_path_name);
2653 stream->prev_path_name = stream->path_name;
5312a3ed 2654 stream->path_name = create_output_path(new_path_view.data);
d3ecc550
JD
2655 if (!stream->path_name) {
2656 ERR("Failed to create a new output path");
5312a3ed 2657 ret = -1;
d3ecc550
JD
2658 goto end_stream_unlock;
2659 }
2660 ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG,
2661 -1, -1);
2662 if (ret < 0) {
2663 ERR("relay creating output directory");
5312a3ed 2664 ret = -1;
d3ecc550
JD
2665 goto end_stream_unlock;
2666 }
5312a3ed 2667
d3ecc550 2668 if (stream->is_metadata) {
c6db3843
JG
2669 /*
2670 * Metadata streams have no index; consider its rotation
2671 * complete.
2672 */
2673 stream->index_rotated = true;
d3ecc550
JD
2674 /*
2675 * The metadata stream is sent only over the control connection
2676 * so we know we have all the data to perform the stream
2677 * rotation.
2678 */
c6db3843 2679 ret = do_rotate_stream_data(stream);
d3ecc550 2680 } else {
5312a3ed 2681 stream->rotate_at_seq_num = stream_info.rotate_at_seq_num;
c6db3843
JG
2682 ret = try_rotate_stream_data(stream);
2683 if (ret < 0) {
2684 goto end_stream_unlock;
2685 }
2686
2687 ret = try_rotate_stream_index(stream);
2688 if (ret < 0) {
2689 goto end_stream_unlock;
2690 }
d3ecc550
JD
2691 }
2692
2693end_stream_unlock:
2694 pthread_mutex_unlock(&stream->lock);
2695 stream_put(stream);
2696end:
2697 memset(&reply, 0, sizeof(reply));
2698 if (ret < 0) {
2699 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2700 } else {
2701 reply.ret_code = htobe32(LTTNG_OK);
2702 }
2703 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2704 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
2705 if (send_ret < (ssize_t) sizeof(reply)) {
2706 ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
2707 send_ret);
2708 ret = -1;
d3ecc550
JD
2709 }
2710
2711end_no_reply:
d3ecc550
JD
2712 return ret;
2713}
2714
e5add6d0
JG
2715static int init_session_output_directory_handle(struct relay_session *session,
2716 struct lttng_directory_handle *handle)
2717{
2718 int ret;
2719 /* hostname/session_name */
2720 char *session_directory = NULL;
2721 /*
2722 * base path + session_directory
2723 * e.g. /home/user/lttng-traces/hostname/session_name
2724 */
2725 char *full_session_path = NULL;
348a81dc
JG
2726 char creation_time_str[16];
2727 struct tm *timeinfo;
2728
2729 assert(session->creation_time.is_set);
2730 timeinfo = localtime(&session->creation_time.value);
2731 if (!timeinfo) {
2732 ret = -1;
2733 goto end;
2734 }
2735 strftime(creation_time_str, sizeof(creation_time_str), "%Y%m%d-%H%M%S",
2736 timeinfo);
e5add6d0
JG
2737
2738 pthread_mutex_lock(&session->lock);
348a81dc
JG
2739 ret = asprintf(&session_directory, "%s/%s-%s", session->hostname,
2740 session->session_name, creation_time_str);
e5add6d0
JG
2741 pthread_mutex_unlock(&session->lock);
2742 if (ret < 0) {
2743 PERROR("Failed to format session directory name");
2744 goto end;
2745 }
2746
2747 full_session_path = create_output_path(session_directory);
2748 if (!full_session_path) {
2749 ret = -1;
2750 goto end;
2751 }
2752
2753 ret = utils_mkdir_recursive(
2754 full_session_path, S_IRWXU | S_IRWXG, -1, -1);
2755 if (ret) {
2756 ERR("Failed to create session output path \"%s\"",
2757 full_session_path);
2758 goto end;
2759 }
2760
2761 ret = lttng_directory_handle_init(handle, full_session_path);
2762 if (ret) {
2763 goto end;
2764 }
2765end:
2766 free(session_directory);
2767 free(full_session_path);
2768 return ret;
2769}
2770
2771/*
2772 * relay_create_trace_chunk: create a new trace chunk
2773 */
2774static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
2775 struct relay_connection *conn,
2776 const struct lttng_buffer_view *payload)
2777{
2778 int ret = 0;
2779 ssize_t send_ret;
2780 struct relay_session *session = conn->session;
2781 struct lttcomm_relayd_create_trace_chunk *msg;
2782 struct lttcomm_relayd_generic_reply reply = {};
2783 struct lttng_buffer_view header_view;
2784 struct lttng_buffer_view chunk_name_view;
2785 struct lttng_trace_chunk *chunk = NULL, *published_chunk = NULL;
2786 enum lttng_error_code reply_code = LTTNG_OK;
2787 enum lttng_trace_chunk_status chunk_status;
2788 struct lttng_directory_handle session_output;
2789
2790 if (!session || !conn->version_check_done) {
2791 ERR("Trying to create a trace chunk before version check");
2792 ret = -1;
2793 goto end_no_reply;
2794 }
2795
2796 if (session->major == 2 && session->minor < 11) {
2797 ERR("Chunk creation command is unsupported before 2.11");
2798 ret = -1;
2799 goto end_no_reply;
2800 }
2801
2802 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2803 if (!header_view.data) {
2804 ERR("Failed to receive payload of chunk creation command");
2805 ret = -1;
2806 goto end_no_reply;
2807 }
2808
2809 /* Convert to host endianness. */
2810 msg = (typeof(msg)) header_view.data;
2811 msg->chunk_id = be64toh(msg->chunk_id);
2812 msg->creation_timestamp = be64toh(msg->creation_timestamp);
2813 msg->override_name_length = be32toh(msg->override_name_length);
2814
2815 chunk = lttng_trace_chunk_create(
2816 msg->chunk_id, msg->creation_timestamp);
2817 if (!chunk) {
2818 ERR("Failed to create trace chunk in trace chunk creation command");
2819 ret = -1;
2820 reply_code = LTTNG_ERR_NOMEM;
2821 goto end;
2822 }
2823
2824 if (msg->override_name_length) {
2825 const char *name;
2826
2827 chunk_name_view = lttng_buffer_view_from_view(payload,
2828 sizeof(*msg),
2829 msg->override_name_length);
2830 name = chunk_name_view.data;
2831 if (!name || name[msg->override_name_length - 1]) {
2832 ERR("Failed to receive payload of chunk creation command");
2833 ret = -1;
2834 reply_code = LTTNG_ERR_INVALID;
2835 goto end;
2836 }
2837
2838 chunk_status = lttng_trace_chunk_override_name(
2839 chunk, chunk_name_view.data);
2840 switch (chunk_status) {
2841 case LTTNG_TRACE_CHUNK_STATUS_OK:
2842 break;
2843 case LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT:
2844 ERR("Failed to set the name of new trace chunk in trace chunk creation command (invalid name)");
2845 reply_code = LTTNG_ERR_INVALID;
2846 ret = -1;
2847 goto end;
2848 default:
2849 ERR("Failed to set the name of new trace chunk in trace chunk creation command (unknown error)");
2850 reply_code = LTTNG_ERR_UNK;
2851 ret = -1;
2852 goto end;
2853 }
2854 }
2855
2856 ret = init_session_output_directory_handle(
2857 conn->session, &session_output);
2858 if (ret) {
2859 reply_code = LTTNG_ERR_CREATE_DIR_FAIL;
2860 goto end;
2861 }
2862
2863 chunk_status = lttng_trace_chunk_set_credentials_current_user(chunk);
2864 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2865 reply_code = LTTNG_ERR_UNK;
2866 ret = -1;
2867 goto end;
2868 }
2869
2870 chunk_status = lttng_trace_chunk_set_as_owner(chunk, &session_output);
2871 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2872 reply_code = LTTNG_ERR_UNK;
2873 ret = -1;
2874 goto end;
2875 }
2876
2877 published_chunk = sessiond_trace_chunk_registry_publish_chunk(
2878 sessiond_trace_chunk_registry,
2879 conn->session->sessiond_uuid,
2880 conn->session->id,
2881 chunk);
2882 if (!published_chunk) {
2883 char uuid_str[UUID_STR_LEN];
2884
2885 lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
2886 ERR("Failed to publish chunk: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
2887 uuid_str,
2888 conn->session->id,
2889 msg->chunk_id);
2890 ret = -1;
2891 reply_code = LTTNG_ERR_NOMEM;
2892 goto end;
2893 }
2894
2895 pthread_mutex_lock(&conn->session->lock);
2896 lttng_trace_chunk_put(conn->session->current_trace_chunk);
2897 conn->session->current_trace_chunk = published_chunk;
2898 pthread_mutex_unlock(&conn->session->lock);
2899 published_chunk = NULL;
2900
2901end:
2902 reply.ret_code = htobe32((uint32_t) reply_code);
2903 send_ret = conn->sock->ops->sendmsg(conn->sock,
2904 &reply,
2905 sizeof(struct lttcomm_relayd_generic_reply),
2906 0);
2907 if (send_ret < (ssize_t) sizeof(reply)) {
2908 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
2909 send_ret);
2910 ret = -1;
2911 }
2912end_no_reply:
2913 lttng_trace_chunk_put(chunk);
2914 lttng_trace_chunk_put(published_chunk);
2915 lttng_directory_handle_fini(&session_output);
2916 return ret;
2917}
2918
bbc4768c
JG
2919/*
2920 * relay_close_trace_chunk: close a trace chunk
2921 */
2922static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
2923 struct relay_connection *conn,
2924 const struct lttng_buffer_view *payload)
2925{
2926 int ret = 0;
2927 ssize_t send_ret;
2928 struct relay_session *session = conn->session;
2929 struct lttcomm_relayd_close_trace_chunk *msg;
2930 struct lttcomm_relayd_generic_reply reply = {};
2931 struct lttng_buffer_view header_view;
2932 struct lttng_trace_chunk *chunk = NULL;
2933 enum lttng_error_code reply_code = LTTNG_OK;
2934 enum lttng_trace_chunk_status chunk_status;
2935 uint64_t chunk_id;
2936 LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command;
2937 time_t close_timestamp;
2938
2939 if (!session || !conn->version_check_done) {
2940 ERR("Trying to close a trace chunk before version check");
2941 ret = -1;
2942 goto end_no_reply;
2943 }
2944
2945 if (session->major == 2 && session->minor < 11) {
2946 ERR("Chunk close command is unsupported before 2.11");
2947 ret = -1;
2948 goto end_no_reply;
2949 }
2950
2951 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2952 if (!header_view.data) {
2953 ERR("Failed to receive payload of chunk close command");
2954 ret = -1;
2955 goto end_no_reply;
2956 }
2957
2958 /* Convert to host endianness. */
2959 msg = (typeof(msg)) header_view.data;
2960 chunk_id = be64toh(msg->chunk_id);
2961 close_timestamp = (time_t) be64toh(msg->close_timestamp);
2962 close_command = (typeof(close_command)){
2963 .value = be32toh(msg->close_command.value),
2964 .is_set = msg->close_command.is_set,
2965 };
2966
2967 chunk = sessiond_trace_chunk_registry_get_chunk(
2968 sessiond_trace_chunk_registry,
2969 conn->session->sessiond_uuid,
2970 conn->session->id,
2971 chunk_id);
2972 if (!chunk) {
2973 char uuid_str[UUID_STR_LEN];
2974
2975 lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
2976 ERR("Failed to find chunk to close: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
2977 uuid_str,
2978 conn->session->id,
2979 msg->chunk_id);
2980 ret = -1;
2981 reply_code = LTTNG_ERR_NOMEM;
2982 goto end;
2983 }
2984
2985 chunk_status = lttng_trace_chunk_set_close_timestamp(
2986 chunk, close_timestamp);
2987 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2988 ERR("Failed to set trace chunk close timestamp");
2989 ret = -1;
2990 reply_code = LTTNG_ERR_UNK;
2991 goto end;
2992 }
2993
2994 if (close_command.is_set) {
2995 chunk_status = lttng_trace_chunk_set_close_command(
2996 chunk, close_command.value);
2997 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2998 ret = -1;
2999 reply_code = LTTNG_ERR_INVALID;
3000 goto end;
3001 }
3002 }
3003
3004end:
3005 reply.ret_code = htobe32((uint32_t) reply_code);
3006 send_ret = conn->sock->ops->sendmsg(conn->sock,
3007 &reply,
3008 sizeof(struct lttcomm_relayd_generic_reply),
3009 0);
3010 if (send_ret < (ssize_t) sizeof(reply)) {
3011 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
3012 send_ret);
3013 ret = -1;
3014 }
3015end_no_reply:
3016 lttng_trace_chunk_put(chunk);
3017 return ret;
3018}
3019
5312a3ed
JG
3020#define DBG_CMD(cmd_name, conn) \
3021 DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
3022
3023static int relay_process_control_command(struct relay_connection *conn,
3024 const struct lttcomm_relayd_hdr *header,
3025 const struct lttng_buffer_view *payload)
b8aa1682
JD
3026{
3027 int ret = 0;
3028
5312a3ed 3029 switch (header->cmd) {
b8aa1682 3030 case RELAYD_CREATE_SESSION:
5312a3ed
JG
3031 DBG_CMD("RELAYD_CREATE_SESSION", conn);
3032 ret = relay_create_session(header, conn, payload);
b8aa1682 3033 break;
b8aa1682 3034 case RELAYD_ADD_STREAM:
5312a3ed
JG
3035 DBG_CMD("RELAYD_ADD_STREAM", conn);
3036 ret = relay_add_stream(header, conn, payload);
b8aa1682
JD
3037 break;
3038 case RELAYD_START_DATA:
5312a3ed
JG
3039 DBG_CMD("RELAYD_START_DATA", conn);
3040 ret = relay_start(header, conn, payload);
b8aa1682
JD
3041 break;
3042 case RELAYD_SEND_METADATA:
5312a3ed
JG
3043 DBG_CMD("RELAYD_SEND_METADATA", conn);
3044 ret = relay_recv_metadata(header, conn, payload);
b8aa1682
JD
3045 break;
3046 case RELAYD_VERSION:
5312a3ed
JG
3047 DBG_CMD("RELAYD_VERSION", conn);
3048 ret = relay_send_version(header, conn, payload);
b8aa1682 3049 break;
173af62f 3050 case RELAYD_CLOSE_STREAM:
5312a3ed
JG
3051 DBG_CMD("RELAYD_CLOSE_STREAM", conn);
3052 ret = relay_close_stream(header, conn, payload);
173af62f 3053 break;
6d805429 3054 case RELAYD_DATA_PENDING:
5312a3ed
JG
3055 DBG_CMD("RELAYD_DATA_PENDING", conn);
3056 ret = relay_data_pending(header, conn, payload);
c8f59ee5
DG
3057 break;
3058 case RELAYD_QUIESCENT_CONTROL:
5312a3ed
JG
3059 DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
3060 ret = relay_quiescent_control(header, conn, payload);
c8f59ee5 3061 break;
f7079f67 3062 case RELAYD_BEGIN_DATA_PENDING:
5312a3ed
JG
3063 DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
3064 ret = relay_begin_data_pending(header, conn, payload);
f7079f67
DG
3065 break;
3066 case RELAYD_END_DATA_PENDING:
5312a3ed
JG
3067 DBG_CMD("RELAYD_END_DATA_PENDING", conn);
3068 ret = relay_end_data_pending(header, conn, payload);
f7079f67 3069 break;
1c20f0e2 3070 case RELAYD_SEND_INDEX:
5312a3ed
JG
3071 DBG_CMD("RELAYD_SEND_INDEX", conn);
3072 ret = relay_recv_index(header, conn, payload);
1c20f0e2 3073 break;
a4baae1b 3074 case RELAYD_STREAMS_SENT:
5312a3ed
JG
3075 DBG_CMD("RELAYD_STREAMS_SENT", conn);
3076 ret = relay_streams_sent(header, conn, payload);
a4baae1b 3077 break;
93ec662e 3078 case RELAYD_RESET_METADATA:
5312a3ed
JG
3079 DBG_CMD("RELAYD_RESET_METADATA", conn);
3080 ret = relay_reset_metadata(header, conn, payload);
93ec662e 3081 break;
d3ecc550 3082 case RELAYD_ROTATE_STREAM:
5312a3ed
JG
3083 DBG_CMD("RELAYD_ROTATE_STREAM", conn);
3084 ret = relay_rotate_session_stream(header, conn, payload);
d3ecc550 3085 break;
e5add6d0
JG
3086 case RELAYD_CREATE_TRACE_CHUNK:
3087 DBG_CMD("RELAYD_CREATE_TRACE_CHUNK", conn);
3088 ret = relay_create_trace_chunk(header, conn, payload);
3089 break;
bbc4768c
JG
3090 case RELAYD_CLOSE_TRACE_CHUNK:
3091 DBG_CMD("RELAYD_CLOSE_TRACE_CHUNK", conn);
3092 ret = relay_close_trace_chunk(header, conn, payload);
3093 break;
b8aa1682
JD
3094 case RELAYD_UPDATE_SYNC_INFO:
3095 default:
5312a3ed 3096 ERR("Received unknown command (%u)", header->cmd);
58eb9381 3097 relay_unknown_command(conn);
b8aa1682
JD
3098 ret = -1;
3099 goto end;
3100 }
3101
3102end:
3103 return ret;
3104}
3105
5569b118
JG
3106static enum relay_connection_status relay_process_control_receive_payload(
3107 struct relay_connection *conn)
5312a3ed
JG
3108{
3109 int ret = 0;
5569b118 3110 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG
3111 struct lttng_dynamic_buffer *reception_buffer =
3112 &conn->protocol.ctrl.reception_buffer;
3113 struct ctrl_connection_state_receive_payload *state =
3114 &conn->protocol.ctrl.state.receive_payload;
3115 struct lttng_buffer_view payload_view;
3116
3117 if (state->left_to_receive == 0) {
3118 /* Short-circuit for payload-less commands. */
3119 goto reception_complete;
3120 }
3121
3122 ret = conn->sock->ops->recvmsg(conn->sock,
3123 reception_buffer->data + state->received,
3124 state->left_to_receive, MSG_DONTWAIT);
3125 if (ret < 0) {
5569b118
JG
3126 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3127 PERROR("Unable to receive command payload on sock %d",
3128 conn->sock->fd);
3129 status = RELAY_CONNECTION_STATUS_ERROR;
3130 }
5312a3ed
JG
3131 goto end;
3132 } else if (ret == 0) {
3133 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3134 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG
3135 goto end;
3136 }
3137
3138 assert(ret > 0);
3139 assert(ret <= state->left_to_receive);
3140
3141 state->left_to_receive -= ret;
3142 state->received += ret;
3143
3144 if (state->left_to_receive > 0) {
3145 /*
3146 * Can't transition to the protocol's next state, wait to
3147 * receive the rest of the header.
3148 */
3149 DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3150 state->received, state->left_to_receive,
3151 conn->sock->fd);
5312a3ed
JG
3152 goto end;
3153 }
3154
3155reception_complete:
3156 DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
3157 conn->sock->fd, state->received);
3158 /*
3159 * The payload required to process the command has been received.
3160 * A view to the reception buffer is forwarded to the various
3161 * commands and the state of the control is reset on success.
3162 *
3163 * Commands are responsible for sending their reply to the peer.
3164 */
3165 payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
3166 0, -1);
3167 ret = relay_process_control_command(conn,
3168 &state->header, &payload_view);
3169 if (ret < 0) {
5569b118 3170 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG
3171 goto end;
3172 }
3173
3174 ret = connection_reset_protocol_state(conn);
5569b118
JG
3175 if (ret) {
3176 status = RELAY_CONNECTION_STATUS_ERROR;
3177 }
5312a3ed 3178end:
5569b118 3179 return status;
5312a3ed
JG
3180}
3181
5569b118
JG
3182static enum relay_connection_status relay_process_control_receive_header(
3183 struct relay_connection *conn)
5312a3ed
JG
3184{
3185 int ret = 0;
5569b118 3186 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG
3187 struct lttcomm_relayd_hdr header;
3188 struct lttng_dynamic_buffer *reception_buffer =
3189 &conn->protocol.ctrl.reception_buffer;
3190 struct ctrl_connection_state_receive_header *state =
3191 &conn->protocol.ctrl.state.receive_header;
3192
3193 assert(state->left_to_receive != 0);
3194
3195 ret = conn->sock->ops->recvmsg(conn->sock,
3196 reception_buffer->data + state->received,
3197 state->left_to_receive, MSG_DONTWAIT);
3198 if (ret < 0) {
5569b118
JG
3199 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3200 PERROR("Unable to receive control command header on sock %d",
3201 conn->sock->fd);
3202 status = RELAY_CONNECTION_STATUS_ERROR;
3203 }
5312a3ed
JG
3204 goto end;
3205 } else if (ret == 0) {
3206 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3207 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG
3208 goto end;
3209 }
3210
3211 assert(ret > 0);
3212 assert(ret <= state->left_to_receive);
3213
3214 state->left_to_receive -= ret;
3215 state->received += ret;
3216
3217 if (state->left_to_receive > 0) {
3218 /*
3219 * Can't transition to the protocol's next state, wait to
3220 * receive the rest of the header.
3221 */
3222 DBG3("Partial reception of control connection protocol header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3223 state->received, state->left_to_receive,
3224 conn->sock->fd);
5312a3ed
JG
3225 goto end;
3226 }
3227
3228 /* Transition to next state: receiving the command's payload. */
3229 conn->protocol.ctrl.state_id =
3230 CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD;
3231 memcpy(&header, reception_buffer->data, sizeof(header));
3232 header.circuit_id = be64toh(header.circuit_id);
3233 header.data_size = be64toh(header.data_size);
3234 header.cmd = be32toh(header.cmd);
3235 header.cmd_version = be32toh(header.cmd_version);
3236 memcpy(&conn->protocol.ctrl.state.receive_payload.header,
3237 &header, sizeof(header));
3238
3239 DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32 ", cmd_version = %" PRIu32 ", payload size = %" PRIu64 " bytes",
3240 conn->sock->fd, header.cmd, header.cmd_version,
3241 header.data_size);
3242
715e6fb1 3243 if (header.data_size > DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE) {
5312a3ed
JG
3244 ERR("Command header indicates a payload (%" PRIu64 " bytes) that exceeds the maximal payload size allowed on a control connection.",
3245 header.data_size);
5569b118 3246 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG
3247 goto end;
3248 }
3249
3250 conn->protocol.ctrl.state.receive_payload.left_to_receive =
3251 header.data_size;
3252 conn->protocol.ctrl.state.receive_payload.received = 0;
3253 ret = lttng_dynamic_buffer_set_size(reception_buffer,
3254 header.data_size);
3255 if (ret) {
5569b118 3256 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG
3257 goto end;
3258 }
3259
3260 if (header.data_size == 0) {
3261 /*
3262 * Manually invoke the next state as the poll loop
3263 * will not wake-up to allow us to proceed further.
3264 */
5569b118 3265 status = relay_process_control_receive_payload(conn);
5312a3ed
JG
3266 }
3267end:
5569b118 3268 return status;
5312a3ed
JG
3269}
3270
3271/*
3272 * Process the commands received on the control socket
3273 */
5569b118
JG
3274static enum relay_connection_status relay_process_control(
3275 struct relay_connection *conn)
5312a3ed 3276{
5569b118 3277 enum relay_connection_status status;
5312a3ed
JG
3278
3279 switch (conn->protocol.ctrl.state_id) {
3280 case CTRL_CONNECTION_STATE_RECEIVE_HEADER:
5569b118 3281 status = relay_process_control_receive_header(conn);
5312a3ed
JG
3282 break;
3283 case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD:
5569b118 3284 status = relay_process_control_receive_payload(conn);
5312a3ed
JG
3285 break;
3286 default: