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Relayd: disallow-clear option parsing
[lttng-tools.git] / src / bin / lttng-relayd / main.c
CommitLineData
b8aa1682
JD		 1/*
2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
cd60b05a 4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
7591bab1 5 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
b8aa1682
JD		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License, version 2 only,
9 * as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
6c1c0768 21#define _LGPL_SOURCE
b8aa1682
JD		 22#include <getopt.h>
23#include <grp.h>
24#include <limits.h>
25#include <pthread.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/mman.h>
31#include <sys/mount.h>
32#include <sys/resource.h>
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
36#include <sys/wait.h>
173af62f 37#include <inttypes.h>
b8aa1682
JD		 38#include <urcu/futex.h>
39#include <urcu/uatomic.h>
40#include <unistd.h>
41#include <fcntl.h>
b8aa1682
JD		 42
43#include <lttng/lttng.h>
44#include <common/common.h>
45#include <common/compat/poll.h>
46#include <common/compat/socket.h>
f263b7fd 47#include <common/compat/endian.h>
e8fa9fb0 48#include <common/compat/getenv.h>
b8aa1682 49#include <common/defaults.h>
3fd27398 50#include <common/daemonize.h>
b8aa1682
JD		 51#include <common/futex.h>
52#include <common/sessiond-comm/sessiond-comm.h>
53#include <common/sessiond-comm/inet.h>
b8aa1682
JD		 54#include <common/sessiond-comm/relayd.h>
55#include <common/uri.h>
a02de639 56#include <common/utils.h>
d3ecc550 57#include <common/align.h>
f40ef1d5 58#include <common/config/session-config.h>
5312a3ed
JG		 59#include <common/dynamic-buffer.h>
60#include <common/buffer-view.h>
7591bab1 61#include <urcu/rculist.h>
b8aa1682 62
0f907de1 63#include "cmd.h"
d3e2ba59 64#include "ctf-trace.h"
1c20f0e2 65#include "index.h"
0f907de1 66#include "utils.h"
b8aa1682 67#include "lttng-relayd.h"
d3e2ba59 68#include "live.h"
55706a7d 69#include "health-relayd.h"
9b5e0863 70#include "testpoint.h"
2f8f53af 71#include "viewer-stream.h"
2a174661
DG		 72#include "session.h"
73#include "stream.h"
58eb9381 74#include "connection.h"
a44ca2ca 75#include "tracefile-array.h"
f056029c 76#include "tcp_keep_alive.h"
b8aa1682 77
4fc83d94
PP		 78static const char *help_msg =
79#ifdef LTTNG_EMBED_HELP
80#include <lttng-relayd.8.h>
81#else
82NULL
83#endif
84;
85
5569b118
JG		 86enum relay_connection_status {
87 RELAY_CONNECTION_STATUS_OK,
a9577b76 88 /* An error occurred while processing an event on the connection. */
5569b118
JG		 89 RELAY_CONNECTION_STATUS_ERROR,
90 /* Connection closed/shutdown cleanly. */
91 RELAY_CONNECTION_STATUS_CLOSED,
92};
93
b8aa1682 94/* command line options */
0f907de1 95char *opt_output_path;
b5218ffb 96static int opt_daemon, opt_background;
d817132c 97static int opt_allow_clear = 1;
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
cd60b05a
JG		 171static struct option long_options[] = {
172 { "control-port", 1, 0, 'C', },
173 { "data-port", 1, 0, 'D', },
8d5c808e 174 { "live-port", 1, 0, 'L', },
cd60b05a 175 { "daemonize", 0, 0, 'd', },
b5218ffb 176 { "background", 0, 0, 'b', },
cd60b05a
JG		 177 { "group", 1, 0, 'g', },
178 { "help", 0, 0, 'h', },
179 { "output", 1, 0, 'o', },
180 { "verbose", 0, 0, 'v', },
181 { "config", 1, 0, 'f' },
3a904098 182 { "version", 0, 0, 'V' },
d817132c 183 { "disallow-clear", 0, 0, 'x' },
cd60b05a
JG		 184 { NULL, 0, 0, 0, },
185};
186
3a904098 187static const char *config_ignore_options[] = { "help", "config", "version" };
cd60b05a 188
cd60b05a
JG		 189/*
190 * Take an option from the getopt output and set it in the right variable to be
191 * used later.
192 *
193 * Return 0 on success else a negative value.
194 */
7591bab1 195static int set_option(int opt, const char *arg, const char *optname)
b8aa1682 196{
cd60b05a
JG		 197 int ret;
198
199 switch (opt) {
200 case 0:
201 fprintf(stderr, "option %s", optname);
202 if (arg) {
203 fprintf(stderr, " with arg %s\n", arg);
204 }
205 break;
206 case 'C':
e8fa9fb0
MD		 207 if (lttng_is_setuid_setgid()) {
208 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
209 "-C, --control-port");
210 } else {
211 ret = uri_parse(arg, &control_uri);
212 if (ret < 0) {
213 ERR("Invalid control URI specified");
214 goto end;
215 }
216 if (control_uri->port == 0) {
217 control_uri->port = DEFAULT_NETWORK_CONTROL_PORT;
218 }
cd60b05a
JG		 219 }
220 break;
221 case 'D':
e8fa9fb0
MD		 222 if (lttng_is_setuid_setgid()) {
223 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
224 "-D, -data-port");
225 } else {
226 ret = uri_parse(arg, &data_uri);
227 if (ret < 0) {
228 ERR("Invalid data URI specified");
229 goto end;
230 }
231 if (data_uri->port == 0) {
232 data_uri->port = DEFAULT_NETWORK_DATA_PORT;
233 }
cd60b05a
JG		 234 }
235 break;
8d5c808e 236 case 'L':
e8fa9fb0
MD		 237 if (lttng_is_setuid_setgid()) {
238 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
239 "-L, -live-port");
240 } else {
241 ret = uri_parse(arg, &live_uri);
242 if (ret < 0) {
243 ERR("Invalid live URI specified");
244 goto end;
245 }
246 if (live_uri->port == 0) {
247 live_uri->port = DEFAULT_NETWORK_VIEWER_PORT;
248 }
8d5c808e
AM		 249 }
250 break;
cd60b05a
JG		 251 case 'd':
252 opt_daemon = 1;
253 break;
b5218ffb
MD		 254 case 'b':
255 opt_background = 1;
256 break;
cd60b05a 257 case 'g':
e8fa9fb0
MD		 258 if (lttng_is_setuid_setgid()) {
259 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
260 "-g, --group");
261 } else {
262 tracing_group_name = strdup(arg);
263 if (tracing_group_name == NULL) {
264 ret = -errno;
265 PERROR("strdup");
266 goto end;
267 }
268 tracing_group_name_override = 1;
330a40bb 269 }
cd60b05a
JG		 270 break;
271 case 'h':
4fc83d94 272 ret = utils_show_help(8, "lttng-relayd", help_msg);
655b5cc1 273 if (ret) {
4fc83d94 274 ERR("Cannot show --help for `lttng-relayd`");
655b5cc1
PP		 275 perror("exec");
276 }
cd60b05a 277 exit(EXIT_FAILURE);
3a904098
AW		 278 case 'V':
279 fprintf(stdout, "%s\n", VERSION);
280 exit(EXIT_SUCCESS);
cd60b05a 281 case 'o':
e8fa9fb0
MD		 282 if (lttng_is_setuid_setgid()) {
283 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
284 "-o, --output");
285 } else {
286 ret = asprintf(&opt_output_path, "%s", arg);
287 if (ret < 0) {
288 ret = -errno;
289 PERROR("asprintf opt_output_path");
290 goto end;
291 }
cd60b05a
JG		 292 }
293 break;
294 case 'v':
295 /* Verbose level can increase using multiple -v */
296 if (arg) {
297 lttng_opt_verbose = config_parse_value(arg);
298 } else {
849e5b7b
DG		 299 /* Only 3 level of verbosity (-vvv). */
300 if (lttng_opt_verbose < 3) {
301 lttng_opt_verbose += 1;
302 }
cd60b05a
JG		 303 }
304 break;
d817132c
JR		 305 case 'x':
306 /* Disallow clear */
307 opt_allow_clear = 0;
308 break;
cd60b05a
JG		 309 default:
310 /* Unknown option or other error.
311 * Error is printed by getopt, just return */
312 ret = -1;
313 goto end;
314 }
315
316 /* All good. */
317 ret = 0;
318
319end:
320 return ret;
321}
322
323/*
324 * config_entry_handler_cb used to handle options read from a config file.
f40ef1d5 325 * See config_entry_handler_cb comment in common/config/session-config.h for the
cd60b05a
JG		 326 * return value conventions.
327 */
7591bab1 328static int config_entry_handler(const struct config_entry *entry, void *unused)
cd60b05a
JG		 329{
330 int ret = 0, i;
331
332 if (!entry || !entry->name || !entry->value) {
333 ret = -EINVAL;
334 goto end;
335 }
336
337 /* Check if the option is to be ignored */
338 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
339 if (!strcmp(entry->name, config_ignore_options[i])) {
340 goto end;
341 }
342 }
343
344 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
345 /* Ignore if entry name is not fully matched. */
346 if (strcmp(entry->name, long_options[i].name)) {
347 continue;
348 }
349
350 /*
7591bab1
MD		 351 * If the option takes no argument on the command line,
352 * we have to check if the value is "true". We support
353 * non-zero numeric values, true, on and yes.
cd60b05a
JG		 354 */
355 if (!long_options[i].has_arg) {
356 ret = config_parse_value(entry->value);
357 if (ret <= 0) {
358 if (ret) {
359 WARN("Invalid configuration value \"%s\" for option %s",
360 entry->value, entry->name);
361 }
362 /* False, skip boolean config option. */
363 goto end;
364 }
365 }
366
367 ret = set_option(long_options[i].val, entry->value, entry->name);
368 goto end;
369 }
370
371 WARN("Unrecognized option \"%s\" in daemon configuration file.",
372 entry->name);
373
374end:
375 return ret;
376}
377
7591bab1 378static int set_options(int argc, char **argv)
cd60b05a 379{
178a0557 380 int c, ret = 0, option_index = 0, retval = 0;
cd60b05a
JG		 381 int orig_optopt = optopt, orig_optind = optind;
382 char *default_address, *optstring;
383 const char *config_path = NULL;
d817132c 384 const char *value = NULL;
cd60b05a
JG		 385
386 optstring = utils_generate_optstring(long_options,
387 sizeof(long_options) / sizeof(struct option));
388 if (!optstring) {
178a0557 389 retval = -ENOMEM;
cd60b05a
JG		 390 goto exit;
391 }
392
393 /* Check for the --config option */
394
395 while ((c = getopt_long(argc, argv, optstring, long_options,
396 &option_index)) != -1) {
397 if (c == '?') {
178a0557 398 retval = -EINVAL;
cd60b05a
JG		 399 goto exit;
400 } else if (c != 'f') {
401 continue;
402 }
403
e8fa9fb0
MD		 404 if (lttng_is_setuid_setgid()) {
405 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
406 "-f, --config");
407 } else {
408 config_path = utils_expand_path(optarg);
409 if (!config_path) {
410 ERR("Failed to resolve path: %s", optarg);
411 }
cd60b05a
JG		 412 }
413 }
414
415 ret = config_get_section_entries(config_path, config_section_name,
416 config_entry_handler, NULL);
417 if (ret) {
418 if (ret > 0) {
419 ERR("Invalid configuration option at line %i", ret);
cd60b05a 420 }
178a0557 421 retval = -1;
cd60b05a
JG		 422 goto exit;
423 }
b8aa1682 424
cd60b05a
JG		 425 /* Reset getopt's global state */
426 optopt = orig_optopt;
427 optind = orig_optind;
b8aa1682 428 while (1) {
cd60b05a 429 c = getopt_long(argc, argv, optstring, long_options, &option_index);
b8aa1682
JD		 430 if (c == -1) {
431 break;
432 }
433
cd60b05a
JG		 434 ret = set_option(c, optarg, long_options[option_index].name);
435 if (ret < 0) {
178a0557 436 retval = -1;
b8aa1682
JD		 437 goto exit;
438 }
439 }
440
441 /* assign default values */
442 if (control_uri == NULL) {
fa91dc52
MD		 443 ret = asprintf(&default_address,
444 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS ":%d",
445 DEFAULT_NETWORK_CONTROL_PORT);
b8aa1682
JD		 446 if (ret < 0) {
447 PERROR("asprintf default data address");
178a0557 448 retval = -1;
b8aa1682
JD		 449 goto exit;
450 }
451
452 ret = uri_parse(default_address, &control_uri);
453 free(default_address);
454 if (ret < 0) {
455 ERR("Invalid control URI specified");
178a0557 456 retval = -1;
b8aa1682
JD		 457 goto exit;
458 }
459 }
460 if (data_uri == NULL) {
fa91dc52
MD		 461 ret = asprintf(&default_address,
462 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS ":%d",
463 DEFAULT_NETWORK_DATA_PORT);
b8aa1682
JD		 464 if (ret < 0) {
465 PERROR("asprintf default data address");
178a0557 466 retval = -1;
b8aa1682
JD		 467 goto exit;
468 }
469
470 ret = uri_parse(default_address, &data_uri);
471 free(default_address);
472 if (ret < 0) {
473 ERR("Invalid data URI specified");
178a0557 474 retval = -1;
b8aa1682
JD		 475 goto exit;
476 }
477 }
d3e2ba59 478 if (live_uri == NULL) {
fa91dc52
MD		 479 ret = asprintf(&default_address,
480 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS ":%d",
481 DEFAULT_NETWORK_VIEWER_PORT);
d3e2ba59
JD		 482 if (ret < 0) {
483 PERROR("asprintf default viewer control address");
178a0557 484 retval = -1;
d3e2ba59
JD		 485 goto exit;
486 }
487
488 ret = uri_parse(default_address, &live_uri);
489 free(default_address);
490 if (ret < 0) {
491 ERR("Invalid viewer control URI specified");
178a0557 492 retval = -1;
d3e2ba59
JD		 493 goto exit;
494 }
495 }
b8aa1682 496
d817132c
JR		 497 if (opt_allow_clear) {
498 /* Check if env variable exists. */
499 value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
500 if (value) {
501 ret = config_parse_value(value);
502 if (ret < 0) {
503 ERR("Invalid value for %s specified", DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
504 retval = -1;
505 goto exit;
506 }
507 opt_allow_clear = !ret;
508 }
509 }
510
b8aa1682 511exit:
cd60b05a 512 free(optstring);
178a0557 513 return retval;
b8aa1682
JD		 514}
515
7591bab1
MD		 516static void print_global_objects(void)
517{
518 rcu_register_thread();
519
520 print_viewer_streams();
521 print_relay_streams();
522 print_sessions();
523
524 rcu_unregister_thread();
525}
526
b8aa1682
JD		 527/*
528 * Cleanup the daemon
529 */
7591bab1 530static void relayd_cleanup(void)
b8aa1682 531{
7591bab1
MD		 532 print_global_objects();
533
b8aa1682
JD		 534 DBG("Cleaning up");
535
178a0557
MD		 536 if (viewer_streams_ht)
537 lttng_ht_destroy(viewer_streams_ht);
538 if (relay_streams_ht)
539 lttng_ht_destroy(relay_streams_ht);
7591bab1
MD		 540 if (sessions_ht)
541 lttng_ht_destroy(sessions_ht);
178a0557 542
095a4ae5
MD		 543 /* free the dynamically allocated opt_output_path */
544 free(opt_output_path);
545
a02de639
CB		 546 /* Close thread quit pipes */
547 utils_close_pipe(thread_quit_pipe);
548
710c1f73
DG		 549 uri_free(control_uri);
550 uri_free(data_uri);
8d5c808e 551 /* Live URI is freed in the live thread. */
cd60b05a
JG		 552
553 if (tracing_group_name_override) {
554 free((void *) tracing_group_name);
555 }
b8aa1682
JD		 556}
557
558/*
559 * Write to writable pipe used to notify a thread.
560 */
7591bab1 561static int notify_thread_pipe(int wpipe)
b8aa1682 562{
6cd525e8 563 ssize_t ret;
b8aa1682 564
6cd525e8
MD		 565 ret = lttng_write(wpipe, "!", 1);
566 if (ret < 1) {
b8aa1682 567 PERROR("write poll pipe");
b4aacfdc 568 goto end;
b8aa1682 569 }
b4aacfdc
MD		 570 ret = 0;
571end:
b8aa1682
JD		 572 return ret;
573}
574
7591bab1 575static int notify_health_quit_pipe(int *pipe)
65931c8b 576{
6cd525e8 577 ssize_t ret;
65931c8b 578
6cd525e8
MD		 579 ret = lttng_write(pipe[1], "4", 1);
580 if (ret < 1) {
65931c8b 581 PERROR("write relay health quit");
b4aacfdc 582 goto end;
65931c8b 583 }
b4aacfdc
MD		 584 ret = 0;
585end:
586 return ret;
65931c8b
MD		 587}
588
b8aa1682 589/*
b4aacfdc 590 * Stop all relayd and relayd-live threads.
b8aa1682 591 */
b4aacfdc 592int lttng_relay_stop_threads(void)
b8aa1682 593{
b4aacfdc 594 int retval = 0;
b8aa1682
JD		 595
596 /* Stopping all threads */
597 DBG("Terminating all threads");
b4aacfdc 598 if (notify_thread_pipe(thread_quit_pipe[1])) {
b8aa1682 599 ERR("write error on thread quit pipe");
b4aacfdc 600 retval = -1;
b8aa1682
JD		 601 }
602
b4aacfdc
MD		 603 if (notify_health_quit_pipe(health_quit_pipe)) {
604 ERR("write error on health quit pipe");
605 }
65931c8b 606
b8aa1682 607 /* Dispatch thread */
26c9d55e 608 CMM_STORE_SHARED(dispatch_thread_exit, 1);
58eb9381 609 futex_nto1_wake(&relay_conn_queue.futex);
178a0557 610
b4aacfdc 611 if (relayd_live_stop()) {
178a0557 612 ERR("Error stopping live threads");
b4aacfdc 613 retval = -1;
178a0557 614 }
b4aacfdc 615 return retval;
b8aa1682
JD		 616}
617
618/*
619 * Signal handler for the daemon
620 *
621 * Simply stop all worker threads, leaving main() return gracefully after
622 * joining all threads and calling cleanup().
623 */
7591bab1 624static void sighandler(int sig)
b8aa1682
JD		 625{
626 switch (sig) {
b8aa1682
JD		 627 case SIGINT:
628 DBG("SIGINT caught");
b4aacfdc
MD		 629 if (lttng_relay_stop_threads()) {
630 ERR("Error stopping threads");
631 }
b8aa1682
JD		 632 break;
633 case SIGTERM:
634 DBG("SIGTERM caught");
b4aacfdc
MD		 635 if (lttng_relay_stop_threads()) {
636 ERR("Error stopping threads");
637 }
b8aa1682 638 break;
3fd27398
MD		 639 case SIGUSR1:
640 CMM_STORE_SHARED(recv_child_signal, 1);
641 break;
b8aa1682
JD		 642 default:
643 break;
644 }
645}
646
647/*
648 * Setup signal handler for :
649 * SIGINT, SIGTERM, SIGPIPE
650 */
7591bab1 651static int set_signal_handler(void)
b8aa1682
JD		 652{
653 int ret = 0;
654 struct sigaction sa;
655 sigset_t sigset;
656
657 if ((ret = sigemptyset(&sigset)) < 0) {
658 PERROR("sigemptyset");
659 return ret;
660 }
661
b8aa1682
JD		 662 sa.sa_mask = sigset;
663 sa.sa_flags = 0;
0072e5e2
MD		 664
665 sa.sa_handler = sighandler;
b8aa1682
JD		 666 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
667 PERROR("sigaction");
668 return ret;
669 }
670
671 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
672 PERROR("sigaction");
673 return ret;
674 }
675
0072e5e2 676 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
b8aa1682
JD		 677 PERROR("sigaction");
678 return ret;
679 }
680
0072e5e2
MD		 681 sa.sa_handler = SIG_IGN;
682 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3fd27398
MD		 683 PERROR("sigaction");
684 return ret;
685 }
686
687 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
b8aa1682
JD		 688
689 return ret;
690}
691
3fd27398
MD		 692void lttng_relay_notify_ready(void)
693{
694 /* Notify the parent of the fork() process that we are ready. */
695 if (opt_daemon || opt_background) {
696 if (uatomic_sub_return(&lttng_relay_ready, 1) == 0) {
697 kill(child_ppid, SIGUSR1);
698 }
699 }
700}
701
b8aa1682
JD		 702/*
703 * Init thread quit pipe.
704 *
705 * Return -1 on error or 0 if all pipes are created.
706 */
7591bab1 707static int init_thread_quit_pipe(void)
b8aa1682 708{
a02de639 709 int ret;
b8aa1682 710
a02de639 711 ret = utils_create_pipe_cloexec(thread_quit_pipe);
b8aa1682 712
b8aa1682
JD		 713 return ret;
714}
715
716/*
717 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
718 */
7591bab1 719static int create_thread_poll_set(struct lttng_poll_event *events, int size)
b8aa1682
JD		 720{
721 int ret;
722
723 if (events == NULL || size == 0) {
724 ret = -1;
725 goto error;
726 }
727
728 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
729 if (ret < 0) {
730 goto error;
731 }
732
733 /* Add quit pipe */
c7759e6a 734 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
b8aa1682
JD		 735 if (ret < 0) {
736 goto error;
737 }
738
739 return 0;
740
741error:
742 return ret;
743}
744
745/*
746 * Check if the thread quit pipe was triggered.
747 *
748 * Return 1 if it was triggered else 0;
749 */
7591bab1 750static int check_thread_quit_pipe(int fd, uint32_t events)
b8aa1682
JD		 751{
752 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
753 return 1;
754 }
755
756 return 0;
757}
758
759/*
760 * Create and init socket from uri.
761 */
7591bab1 762static struct lttcomm_sock *relay_socket_create(struct lttng_uri *uri)
b8aa1682
JD		 763{
764 int ret;
765 struct lttcomm_sock *sock = NULL;
766
767 sock = lttcomm_alloc_sock_from_uri(uri);
768 if (sock == NULL) {
769 ERR("Allocating socket");
770 goto error;
771 }
772
773 ret = lttcomm_create_sock(sock);
774 if (ret < 0) {
775 goto error;
776 }
777 DBG("Listening on sock %d", sock->fd);
778
779 ret = sock->ops->bind(sock);
780 if (ret < 0) {
2288467f 781 PERROR("Failed to bind socket");
b8aa1682
JD		 782 goto error;
783 }
784
785 ret = sock->ops->listen(sock, -1);
786 if (ret < 0) {
787 goto error;
788
789 }
790
791 return sock;
792
793error:
794 if (sock) {
795 lttcomm_destroy_sock(sock);
796 }
797 return NULL;
798}
799
800/*
801 * This thread manages the listening for new connections on the network
802 */
7591bab1 803static void *relay_thread_listener(void *data)
b8aa1682 804{
095a4ae5 805 int i, ret, pollfd, err = -1;
b8aa1682
JD		 806 uint32_t revents, nb_fd;
807 struct lttng_poll_event events;
808 struct lttcomm_sock *control_sock, *data_sock;
809
b8aa1682
JD		 810 DBG("[thread] Relay listener started");
811
55706a7d
MD		 812 health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
813
f385ae0a
MD		 814 health_code_update();
815
7591bab1 816 control_sock = relay_socket_create(control_uri);
b8aa1682 817 if (!control_sock) {
095a4ae5 818 goto error_sock_control;
b8aa1682
JD		 819 }
820
7591bab1 821 data_sock = relay_socket_create(data_uri);
b8aa1682 822 if (!data_sock) {
095a4ae5 823 goto error_sock_relay;
b8aa1682
JD		 824 }
825
826 /*
7591bab1
MD		 827 * Pass 3 as size here for the thread quit pipe, control and
828 * data socket.
b8aa1682
JD		 829 */
830 ret = create_thread_poll_set(&events, 3);
831 if (ret < 0) {
832 goto error_create_poll;
833 }
834
835 /* Add the control socket */
836 ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP);
837 if (ret < 0) {
838 goto error_poll_add;
839 }
840
841 /* Add the data socket */
842 ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP);
843 if (ret < 0) {
844 goto error_poll_add;
845 }
846
3fd27398
MD		 847 lttng_relay_notify_ready();
848
9b5e0863
MD		 849 if (testpoint(relayd_thread_listener)) {
850 goto error_testpoint;
851 }
852
b8aa1682 853 while (1) {
f385ae0a
MD		 854 health_code_update();
855
b8aa1682
JD		 856 DBG("Listener accepting connections");
857
b8aa1682 858restart:
f385ae0a 859 health_poll_entry();
b8aa1682 860 ret = lttng_poll_wait(&events, -1);
f385ae0a 861 health_poll_exit();
b8aa1682
JD		 862 if (ret < 0) {
863 /*
864 * Restart interrupted system call.
865 */
866 if (errno == EINTR) {
867 goto restart;
868 }
869 goto error;
870 }
871
0d9c5d77
DG		 872 nb_fd = ret;
873
b8aa1682
JD		 874 DBG("Relay new connection received");
875 for (i = 0; i < nb_fd; i++) {
f385ae0a
MD		 876 health_code_update();
877
b8aa1682
JD		 878 /* Fetch once the poll data */
879 revents = LTTNG_POLL_GETEV(&events, i);
880 pollfd = LTTNG_POLL_GETFD(&events, i);
881
fd20dac9 882 if (!revents) {
7591bab1
MD		 883 /*
884 * No activity for this FD (poll
885 * implementation).
886 */
fd20dac9
MD		 887 continue;
888 }
889
b8aa1682
JD		 890 /* Thread quit pipe has been closed. Killing thread. */
891 ret = check_thread_quit_pipe(pollfd, revents);
892 if (ret) {
095a4ae5
MD		 893 err = 0;
894 goto exit;
b8aa1682
JD		 895 }
896
03e43155 897 if (revents & LPOLLIN) {
4b7f17b2 898 /*
7591bab1
MD		 899 * A new connection is requested, therefore a
900 * sessiond/consumerd connection is allocated in
901 * this thread, enqueued to a global queue and
902 * dequeued (and freed) in the worker thread.
4b7f17b2 903 */
58eb9381
DG		 904 int val = 1;
905 struct relay_connection *new_conn;
4b7f17b2 906 struct lttcomm_sock *newsock;
7591bab1 907 enum connection_type type;
b8aa1682
JD		 908
909 if (pollfd == data_sock->fd) {
7591bab1 910 type = RELAY_DATA;
b8aa1682 911 newsock = data_sock->ops->accept(data_sock);
58eb9381
DG		 912 DBG("Relay data connection accepted, socket %d",
913 newsock->fd);
4b7f17b2
MD		 914 } else {
915 assert(pollfd == control_sock->fd);
7591bab1 916 type = RELAY_CONTROL;
b8aa1682 917 newsock = control_sock->ops->accept(control_sock);
58eb9381
DG		 918 DBG("Relay control connection accepted, socket %d",
919 newsock->fd);
b8aa1682 920 }
58eb9381
DG		 921 if (!newsock) {
922 PERROR("accepting sock");
58eb9381
DG		 923 goto error;
924 }
925
926 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
927 sizeof(val));
b8aa1682
JD		 928 if (ret < 0) {
929 PERROR("setsockopt inet");
4b7f17b2 930 lttcomm_destroy_sock(newsock);
b8aa1682
JD		 931 goto error;
932 }
f056029c
JR		 933
934 ret = socket_apply_keep_alive_config(newsock->fd);
935 if (ret < 0) {
936 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
937 newsock->fd);
938 lttcomm_destroy_sock(newsock);
939 goto error;
940 }
941
7591bab1
MD		 942 new_conn = connection_create(newsock, type);
943 if (!new_conn) {
944 lttcomm_destroy_sock(newsock);
945 goto error;
946 }
58eb9381
DG		 947
948 /* Enqueue request for the dispatcher thread. */
8bdee6e2
SM		 949 cds_wfcq_enqueue(&relay_conn_queue.head, &relay_conn_queue.tail,
950 &new_conn->qnode);
b8aa1682
JD		 951
952 /*
7591bab1
MD		 953 * Wake the dispatch queue futex.
954 * Implicit memory barrier with the
955 * exchange in cds_wfcq_enqueue.
b8aa1682 956 */
58eb9381 957 futex_nto1_wake(&relay_conn_queue.futex);
03e43155
MD		 958 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
959 ERR("socket poll error");
960 goto error;
961 } else {
962 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
963 goto error;
b8aa1682
JD		 964 }
965 }
966 }
967
095a4ae5 968exit:
b8aa1682
JD		 969error:
970error_poll_add:
9b5e0863 971error_testpoint:
b8aa1682
JD		 972 lttng_poll_clean(&events);
973error_create_poll:
095a4ae5
MD		 974 if (data_sock->fd >= 0) {
975 ret = data_sock->ops->close(data_sock);
b8aa1682
JD		 976 if (ret) {
977 PERROR("close");
978 }
b8aa1682 979 }
095a4ae5
MD		 980 lttcomm_destroy_sock(data_sock);
981error_sock_relay:
982 if (control_sock->fd >= 0) {
983 ret = control_sock->ops->close(control_sock);
b8aa1682
JD		 984 if (ret) {
985 PERROR("close");
986 }
b8aa1682 987 }
095a4ae5
MD		 988 lttcomm_destroy_sock(control_sock);
989error_sock_control:
990 if (err) {
f385ae0a
MD		 991 health_error();
992 ERR("Health error occurred in %s", __func__);
095a4ae5 993 }
55706a7d 994 health_unregister(health_relayd);
b8aa1682 995 DBG("Relay listener thread cleanup complete");
b4aacfdc 996 lttng_relay_stop_threads();
b8aa1682
JD		 997 return NULL;
998}
999
1000/*
1001 * This thread manages the dispatching of the requests to worker threads
1002 */
7591bab1 1003static void *relay_thread_dispatcher(void *data)
b8aa1682 1004{
6cd525e8
MD		 1005 int err = -1;
1006 ssize_t ret;
8bdee6e2 1007 struct cds_wfcq_node *node;
58eb9381 1008 struct relay_connection *new_conn = NULL;
b8aa1682
JD		 1009
1010 DBG("[thread] Relay dispatcher started");
1011
55706a7d
MD		 1012 health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER);
1013
9b5e0863
MD		 1014 if (testpoint(relayd_thread_dispatcher)) {
1015 goto error_testpoint;
1016 }
1017
f385ae0a
MD		 1018 health_code_update();
1019
0ed3b1a8 1020 for (;;) {
f385ae0a
MD		 1021 health_code_update();
1022
b8aa1682 1023 /* Atomically prepare the queue futex */
58eb9381 1024 futex_nto1_prepare(&relay_conn_queue.futex);
b8aa1682 1025
0ed3b1a8
MD		 1026 if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
1027 break;
1028 }
1029
b8aa1682 1030 do {
f385ae0a
MD		 1031 health_code_update();
1032
b8aa1682 1033 /* Dequeue commands */
8bdee6e2
SM		 1034 node = cds_wfcq_dequeue_blocking(&relay_conn_queue.head,
1035 &relay_conn_queue.tail);
b8aa1682
JD		 1036 if (node == NULL) {
1037 DBG("Woken up but nothing in the relay command queue");
1038 /* Continue thread execution */
1039 break;
1040 }
58eb9381 1041 new_conn = caa_container_of(node, struct relay_connection, qnode);
b8aa1682 1042
58eb9381 1043 DBG("Dispatching request waiting on sock %d", new_conn->sock->fd);
b8aa1682
JD		 1044
1045 /*
7591bab1
MD		 1046 * Inform worker thread of the new request. This
1047 * call is blocking so we can be assured that
1048 * the data will be read at some point in time
1049 * or wait to the end of the world :)
b8aa1682 1050 */
58eb9381
DG		 1051 ret = lttng_write(relay_conn_pipe[1], &new_conn, sizeof(new_conn));
1052 if (ret < 0) {
1053 PERROR("write connection pipe");
7591bab1 1054 connection_put(new_conn);
b8aa1682
JD		 1055 goto error;
1056 }
1057 } while (node != NULL);
1058
1059 /* Futex wait on queue. Blocking call on futex() */
f385ae0a 1060 health_poll_entry();
58eb9381 1061 futex_nto1_wait(&relay_conn_queue.futex);
f385ae0a 1062 health_poll_exit();
b8aa1682
JD		 1063 }
1064
f385ae0a
MD		 1065 /* Normal exit, no error */
1066 err = 0;
1067
b8aa1682 1068error:
9b5e0863 1069error_testpoint:
f385ae0a
MD		 1070 if (err) {
1071 health_error();
1072 ERR("Health error occurred in %s", __func__);
1073 }
55706a7d 1074 health_unregister(health_relayd);
b8aa1682 1075 DBG("Dispatch thread dying");
b4aacfdc 1076 lttng_relay_stop_threads();
b8aa1682
JD		 1077 return NULL;
1078}
1079
b8aa1682 1080/*
7591bab1 1081 * Set index data from the control port to a given index object.
b8aa1682 1082 */
7591bab1 1083static int set_index_control_data(struct relay_index *index,
234cd636
JD		 1084 struct lttcomm_relayd_index *data,
1085 struct relay_connection *conn)
1c20f0e2 1086{
7591bab1 1087 struct ctf_packet_index index_data;
1c20f0e2
JD		 1088
1089 /*
5312a3ed 1090 * The index on disk is encoded in big endian.
1c20f0e2 1091 */
5312a3ed
JG		 1092 index_data.packet_size = htobe64(data->packet_size);
1093 index_data.content_size = htobe64(data->content_size);
1094 index_data.timestamp_begin = htobe64(data->timestamp_begin);
1095 index_data.timestamp_end = htobe64(data->timestamp_end);
1096 index_data.events_discarded = htobe64(data->events_discarded);
1097 index_data.stream_id = htobe64(data->stream_id);
234cd636
JD		 1098
1099 if (conn->minor >= 8) {
5312a3ed
JG		 1100 index->index_data.stream_instance_id = htobe64(data->stream_instance_id);
1101 index->index_data.packet_seq_num = htobe64(data->packet_seq_num);
234cd636
JD		 1102 }
1103
7591bab1 1104 return relay_index_set_data(index, &index_data);
1c20f0e2
JD		 1105}
1106
298a25ca
JG		 1107static bool session_streams_have_index(const struct relay_session *session)
1108{
1109 return session->minor >= 4 && !session->snapshot;
1110}
1111
c5b6f4f0
DG		 1112/*
1113 * Handle the RELAYD_CREATE_SESSION command.
1114 *
1115 * On success, send back the session id or else return a negative value.
1116 */
5312a3ed
JG		 1117static int relay_create_session(const struct lttcomm_relayd_hdr *recv_hdr,
1118 struct relay_connection *conn,
1119 const struct lttng_buffer_view *payload)
c5b6f4f0 1120{
5312a3ed
JG		 1121 int ret = 0;
1122 ssize_t send_ret;
c5b6f4f0
DG		 1123 struct relay_session *session;
1124 struct lttcomm_relayd_status_session reply;
36d2e35d 1125 char session_name[LTTNG_NAME_MAX];
9cf3eb20 1126 char hostname[LTTNG_HOST_NAME_MAX];
7591bab1
MD		 1127 uint32_t live_timer = 0;
1128 bool snapshot = false;
c5b6f4f0 1129
36d2e35d 1130 memset(session_name, 0, LTTNG_NAME_MAX);
9cf3eb20 1131 memset(hostname, 0, LTTNG_HOST_NAME_MAX);
c5b6f4f0
DG		 1132
1133 memset(&reply, 0, sizeof(reply));
1134
f86f6389
JR		 1135 if (conn->minor < 4) {
1136 /* From 2.1 to 2.3 */
1137 ret = 0;
1138 } else if (conn->minor >= 4 && conn->minor < 11) {
1139 /* From 2.4 to 2.10 */
5312a3ed 1140 ret = cmd_create_session_2_4(payload, session_name,
7591bab1 1141 hostname, &live_timer, &snapshot);
f86f6389
JR		 1142 } else {
1143 /* From 2.11 to ... */
1144 ret = cmd_create_session_2_11(payload, session_name,
1145 hostname, &live_timer, &snapshot);
7591bab1 1146 }
f86f6389 1147
7591bab1
MD		 1148 if (ret < 0) {
1149 goto send_reply;
d3e2ba59
JD		 1150 }
1151
7591bab1
MD		 1152 session = session_create(session_name, hostname, live_timer,
1153 snapshot, conn->major, conn->minor);
1154 if (!session) {
1155 ret = -1;
1156 goto send_reply;
1157 }
1158 assert(!conn->session);
1159 conn->session = session;
c5b6f4f0
DG		 1160 DBG("Created session %" PRIu64, session->id);
1161
7591bab1
MD		 1162 reply.session_id = htobe64(session->id);
1163
1164send_reply:
c5b6f4f0
DG		 1165 if (ret < 0) {
1166 reply.ret_code = htobe32(LTTNG_ERR_FATAL);
1167 } else {
1168 reply.ret_code = htobe32(LTTNG_OK);
1169 }
1170
58eb9381 1171 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 1172 if (send_ret < (ssize_t) sizeof(reply)) {
1173 ERR("Failed to send \"create session\" command reply (ret = %zd)",
1174 send_ret);
1175 ret = -1;
c5b6f4f0
DG		 1176 }
1177
1178 return ret;
1179}
1180
a4baae1b
JD		 1181/*
1182 * When we have received all the streams and the metadata for a channel,
1183 * we make them visible to the viewer threads.
1184 */
7591bab1 1185static void publish_connection_local_streams(struct relay_connection *conn)
a4baae1b 1186{
7591bab1
MD		 1187 struct relay_stream *stream;
1188 struct relay_session *session = conn->session;
a4baae1b 1189
7591bab1
MD		 1190 /*
1191 * We publish all streams belonging to a session atomically wrt
1192 * session lock.
1193 */
1194 pthread_mutex_lock(&session->lock);
1195 rcu_read_lock();
1196 cds_list_for_each_entry_rcu(stream, &session->recv_list,
1197 recv_node) {
1198 stream_publish(stream);
a4baae1b 1199 }
7591bab1 1200 rcu_read_unlock();
a4baae1b 1201
7591bab1
MD		 1202 /*
1203 * Inform the viewer that there are new streams in the session.
1204 */
1205 if (session->viewer_attached) {
1206 uatomic_set(&session->new_streams, 1);
1207 }
1208 pthread_mutex_unlock(&session->lock);
a4baae1b
JD		 1209}
1210
b8aa1682
JD		 1211/*
1212 * relay_add_stream: allocate a new stream for a session
1213 */
5312a3ed
JG		 1214static int relay_add_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1215 struct relay_connection *conn,
1216 const struct lttng_buffer_view *payload)
b8aa1682 1217{
7591bab1
MD		 1218 int ret;
1219 ssize_t send_ret;
58eb9381 1220 struct relay_session *session = conn->session;
b8aa1682
JD		 1221 struct relay_stream *stream = NULL;
1222 struct lttcomm_relayd_status_stream reply;
4030a636 1223 struct ctf_trace *trace = NULL;
7591bab1
MD		 1224 uint64_t stream_handle = -1ULL;
1225 char *path_name = NULL, *channel_name = NULL;
1226 uint64_t tracefile_size = 0, tracefile_count = 0;
81164b6b 1227 struct relay_stream_chunk_id stream_chunk_id = { 0 };
b8aa1682 1228
5312a3ed 1229 if (!session || !conn->version_check_done) {
b8aa1682
JD		 1230 ERR("Trying to add a stream before version check");
1231 ret = -1;
1232 goto end_no_session;
1233 }
1234
2f21a469
JR		 1235 if (session->minor == 1) {
1236 /* For 2.1 */
5312a3ed 1237 ret = cmd_recv_stream_2_1(payload, &path_name,
7591bab1 1238 &channel_name);
2f21a469
JR		 1239 } else if (session->minor > 1 && session->minor < 11) {
1240 /* From 2.2 to 2.10 */
5312a3ed 1241 ret = cmd_recv_stream_2_2(payload, &path_name,
7591bab1 1242 &channel_name, &tracefile_size, &tracefile_count);
2f21a469
JR		 1243 } else {
1244 /* From 2.11 to ... */
1245 ret = cmd_recv_stream_2_11(payload, &path_name,
0b50e4b3
JG		 1246 &channel_name, &tracefile_size, &tracefile_count,
1247 &stream_chunk_id.value);
1248 stream_chunk_id.is_set = true;
0f907de1 1249 }
2f21a469 1250
0f907de1 1251 if (ret < 0) {
7591bab1 1252 goto send_reply;
b8aa1682
JD		 1253 }
1254
7591bab1 1255 trace = ctf_trace_get_by_path_or_create(session, path_name);
2a174661 1256 if (!trace) {
7591bab1 1257 goto send_reply;
2a174661 1258 }
7591bab1 1259 /* This stream here has one reference on the trace. */
2a174661 1260
7591bab1
MD		 1261 pthread_mutex_lock(&last_relay_stream_id_lock);
1262 stream_handle = ++last_relay_stream_id;
1263 pthread_mutex_unlock(&last_relay_stream_id_lock);
d3e2ba59 1264
7591bab1
MD		 1265 /* We pass ownership of path_name and channel_name. */
1266 stream = stream_create(trace, stream_handle, path_name,
81164b6b
JG		 1267 channel_name, tracefile_size, tracefile_count,
1268 &stream_chunk_id);
7591bab1
MD		 1269 path_name = NULL;
1270 channel_name = NULL;
a4baae1b 1271
2a174661 1272 /*
7591bab1
MD		 1273 * Streams are the owners of their trace. Reference to trace is
1274 * kept within stream_create().
2a174661 1275 */
7591bab1 1276 ctf_trace_put(trace);
d3e2ba59 1277
7591bab1 1278send_reply:
53efb85a 1279 memset(&reply, 0, sizeof(reply));
7591bab1
MD		 1280 reply.handle = htobe64(stream_handle);
1281 if (!stream) {
f73fabfd 1282 reply.ret_code = htobe32(LTTNG_ERR_UNK);
b8aa1682 1283 } else {
f73fabfd 1284 reply.ret_code = htobe32(LTTNG_OK);
b8aa1682 1285 }
5af40280 1286
58eb9381 1287 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
b8aa1682 1288 sizeof(struct lttcomm_relayd_status_stream), 0);
5312a3ed
JG		 1289 if (send_ret < (ssize_t) sizeof(reply)) {
1290 ERR("Failed to send \"add stream\" command reply (ret = %zd)",
1291 send_ret);
1292 ret = -1;
b8aa1682
JD		 1293 }
1294
1295end_no_session:
7591bab1
MD		 1296 free(path_name);
1297 free(channel_name);
0f907de1 1298 return ret;
b8aa1682
JD		 1299}
1300
173af62f
DG		 1301/*
1302 * relay_close_stream: close a specific stream
1303 */
5312a3ed
JG		 1304static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1305 struct relay_connection *conn,
1306 const struct lttng_buffer_view *payload)
173af62f 1307{
5312a3ed
JG		 1308 int ret;
1309 ssize_t send_ret;
58eb9381 1310 struct relay_session *session = conn->session;
173af62f
DG		 1311 struct lttcomm_relayd_close_stream stream_info;
1312 struct lttcomm_relayd_generic_reply reply;
1313 struct relay_stream *stream;
173af62f
DG		 1314
1315 DBG("Close stream received");
1316
5312a3ed 1317 if (!session || !conn->version_check_done) {
173af62f
DG		 1318 ERR("Trying to close a stream before version check");
1319 ret = -1;
1320 goto end_no_session;
1321 }
1322
5312a3ed
JG		 1323 if (payload->size < sizeof(stream_info)) {
1324 ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
1325 sizeof(stream_info), payload->size);
173af62f
DG		 1326 ret = -1;
1327 goto end_no_session;
1328 }
5312a3ed
JG		 1329 memcpy(&stream_info, payload->data, sizeof(stream_info));
1330 stream_info.stream_id = be64toh(stream_info.stream_id);
1331 stream_info.last_net_seq_num = be64toh(stream_info.last_net_seq_num);
173af62f 1332
5312a3ed 1333 stream = stream_get_by_id(stream_info.stream_id);
173af62f
DG		 1334 if (!stream) {
1335 ret = -1;
7591bab1 1336 goto end;
173af62f 1337 }
77f7bd85
MD		 1338
1339 /*
1340 * Set last_net_seq_num before the close flag. Required by data
1341 * pending check.
1342 */
7591bab1 1343 pthread_mutex_lock(&stream->lock);
5312a3ed 1344 stream->last_net_seq_num = stream_info.last_net_seq_num;
77f7bd85
MD		 1345 pthread_mutex_unlock(&stream->lock);
1346
bda7c7b9
JG		 1347 /*
1348 * This is one of the conditions which may trigger a stream close
1349 * with the others being:
1350 * 1) A close command is received for a stream
1351 * 2) The control connection owning the stream is closed
1352 * 3) We have received all of the stream's data _after_ a close
1353 * request.
1354 */
1355 try_stream_close(stream);
7591bab1
MD		 1356 if (stream->is_metadata) {
1357 struct relay_viewer_stream *vstream;
173af62f 1358
7591bab1
MD		 1359 vstream = viewer_stream_get_by_id(stream->stream_handle);
1360 if (vstream) {
1361 if (vstream->metadata_sent == stream->metadata_received) {
1362 /*
1363 * Since all the metadata has been sent to the
1364 * viewer and that we have a request to close
1365 * its stream, we can safely teardown the
1366 * corresponding metadata viewer stream.
1367 */
1368 viewer_stream_put(vstream);
1369 }
1370 /* Put local reference. */
1371 viewer_stream_put(vstream);
1372 }
1373 }
7591bab1 1374 stream_put(stream);
5312a3ed 1375 ret = 0;
173af62f 1376
7591bab1 1377end:
53efb85a 1378 memset(&reply, 0, sizeof(reply));
173af62f 1379 if (ret < 0) {
f73fabfd 1380 reply.ret_code = htobe32(LTTNG_ERR_UNK);
173af62f 1381 } else {
f73fabfd 1382 reply.ret_code = htobe32(LTTNG_OK);
173af62f 1383 }
58eb9381 1384 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
173af62f 1385 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 1386 if (send_ret < (ssize_t) sizeof(reply)) {
1387 ERR("Failed to send \"close stream\" command reply (ret = %zd)",
1388 send_ret);
1389 ret = -1;
173af62f
DG		 1390 }
1391
1392end_no_session:
1393 return ret;
1394}
1395
93ec662e
JD		 1396/*
1397 * relay_reset_metadata: reset a metadata stream
1398 */
1399static
5312a3ed
JG		 1400int relay_reset_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1401 struct relay_connection *conn,
1402 const struct lttng_buffer_view *payload)
93ec662e 1403{
5312a3ed
JG		 1404 int ret;
1405 ssize_t send_ret;
93ec662e
JD		 1406 struct relay_session *session = conn->session;
1407 struct lttcomm_relayd_reset_metadata stream_info;
1408 struct lttcomm_relayd_generic_reply reply;
1409 struct relay_stream *stream;
1410
1411 DBG("Reset metadata received");
1412
5312a3ed 1413 if (!session || !conn->version_check_done) {
93ec662e
JD		 1414 ERR("Trying to reset a metadata stream before version check");
1415 ret = -1;
1416 goto end_no_session;
1417 }
1418
5312a3ed
JG		 1419 if (payload->size < sizeof(stream_info)) {
1420 ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
1421 sizeof(stream_info), payload->size);
93ec662e
JD		 1422 ret = -1;
1423 goto end_no_session;
1424 }
5312a3ed
JG		 1425 memcpy(&stream_info, payload->data, sizeof(stream_info));
1426 stream_info.stream_id = be64toh(stream_info.stream_id);
1427 stream_info.version = be64toh(stream_info.version);
1428
1429 DBG("Update metadata to version %" PRIu64, stream_info.version);
93ec662e
JD		 1430
1431 /* Unsupported for live sessions for now. */
1432 if (session->live_timer != 0) {
1433 ret = -1;
1434 goto end;
1435 }
1436
5312a3ed 1437 stream = stream_get_by_id(stream_info.stream_id);
93ec662e
JD		 1438 if (!stream) {
1439 ret = -1;
1440 goto end;
1441 }
1442 pthread_mutex_lock(&stream->lock);
1443 if (!stream->is_metadata) {
1444 ret = -1;
1445 goto end_unlock;
1446 }
1447
1448 ret = utils_rotate_stream_file(stream->path_name, stream->channel_name,
1449 0, 0, -1, -1, stream->stream_fd->fd, NULL,
1450 &stream->stream_fd->fd);
1451 if (ret < 0) {
1452 ERR("Failed to rotate metadata file %s of channel %s",
1453 stream->path_name, stream->channel_name);
1454 goto end_unlock;
1455 }
1456
1457end_unlock:
1458 pthread_mutex_unlock(&stream->lock);
1459 stream_put(stream);
1460
1461end:
1462 memset(&reply, 0, sizeof(reply));
1463 if (ret < 0) {
1464 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1465 } else {
1466 reply.ret_code = htobe32(LTTNG_OK);
1467 }
1468 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1469 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 1470 if (send_ret < (ssize_t) sizeof(reply)) {
1471 ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
1472 send_ret);
1473 ret = -1;
93ec662e
JD		 1474 }
1475
1476end_no_session:
1477 return ret;
1478}
1479
b8aa1682
JD		 1480/*
1481 * relay_unknown_command: send -1 if received unknown command
1482 */
7591bab1 1483static void relay_unknown_command(struct relay_connection *conn)
b8aa1682
JD		 1484{
1485 struct lttcomm_relayd_generic_reply reply;
5312a3ed 1486 ssize_t send_ret;
b8aa1682 1487
53efb85a 1488 memset(&reply, 0, sizeof(reply));
f73fabfd 1489 reply.ret_code = htobe32(LTTNG_ERR_UNK);
5312a3ed
JG		 1490 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1491 if (send_ret < sizeof(reply)) {
1492 ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret);
b8aa1682
JD		 1493 }
1494}
1495
1496/*
1497 * relay_start: send an acknowledgment to the client to tell if we are
1498 * ready to receive data. We are ready if a session is established.
1499 */
5312a3ed
JG		 1500static int relay_start(const struct lttcomm_relayd_hdr *recv_hdr,
1501 struct relay_connection *conn,
1502 const struct lttng_buffer_view *payload)
b8aa1682 1503{
5312a3ed
JG		 1504 int ret = 0;
1505 ssize_t send_ret;
b8aa1682 1506 struct lttcomm_relayd_generic_reply reply;
58eb9381 1507 struct relay_session *session = conn->session;
b8aa1682
JD		 1508
1509 if (!session) {
1510 DBG("Trying to start the streaming without a session established");
f73fabfd 1511 ret = htobe32(LTTNG_ERR_UNK);
b8aa1682
JD		 1512 }
1513
53efb85a 1514 memset(&reply, 0, sizeof(reply));
5312a3ed
JG		 1515 reply.ret_code = htobe32(LTTNG_OK);
1516 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1517 sizeof(reply), 0);
1518 if (send_ret < (ssize_t) sizeof(reply)) {
1519 ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
1520 send_ret);
1521 ret = -1;
b8aa1682
JD		 1522 }
1523
1524 return ret;
1525}
1526
1d4dfdef
DG		 1527/*
1528 * Append padding to the file pointed by the file descriptor fd.
1529 */
1530static int write_padding_to_file(int fd, uint32_t size)
1531{
6cd525e8 1532 ssize_t ret = 0;
1d4dfdef
DG		 1533 char *zeros;
1534
1535 if (size == 0) {
1536 goto end;
1537 }
1538
1539 zeros = zmalloc(size);
1540 if (zeros == NULL) {
1541 PERROR("zmalloc zeros for padding");
1542 ret = -1;
1543 goto end;
1544 }
1545
6cd525e8
MD		 1546 ret = lttng_write(fd, zeros, size);
1547 if (ret < size) {
1d4dfdef
DG		 1548 PERROR("write padding to file");
1549 }
1550
e986c7a1
DG		 1551 free(zeros);
1552
1d4dfdef
DG		 1553end:
1554 return ret;
1555}
1556
d3ecc550
JD		 1557/*
1558 * Close the current index file if it is open, and create a new one.
1559 *
1560 * Return 0 on success, -1 on error.
1561 */
1562static
cb523e02
JG		 1563int create_rotate_index_file(struct relay_stream *stream,
1564 const char *stream_path)
d3ecc550
JD		 1565{
1566 int ret;
1567 uint32_t major, minor;
1568
1569 /* Put ref on previous index_file. */
1570 if (stream->index_file) {
1571 lttng_index_file_put(stream->index_file);
1572 stream->index_file = NULL;
1573 }
1574 major = stream->trace->session->major;
1575 minor = stream->trace->session->minor;
cb523e02 1576 stream->index_file = lttng_index_file_create(stream_path,
d3ecc550
JD		 1577 stream->channel_name,
1578 -1, -1, stream->tracefile_size,
1579 tracefile_array_get_file_index_head(stream->tfa),
1580 lttng_to_index_major(major, minor),
1581 lttng_to_index_minor(major, minor));
1582 if (!stream->index_file) {
1583 ret = -1;
1584 goto end;
1585 }
1586
1587 ret = 0;
1588
1589end:
1590 return ret;
1591}
1592
1593static
c6db3843 1594int do_rotate_stream_data(struct relay_stream *stream)
d3ecc550
JD		 1595{
1596 int ret;
1597
c6db3843
JG		 1598 DBG("Rotating stream %" PRIu64 " data file",
1599 stream->stream_handle);
d3ecc550
JD		 1600 /* Perform the stream rotation. */
1601 ret = utils_rotate_stream_file(stream->path_name,
1602 stream->channel_name, stream->tracefile_size,
1603 stream->tracefile_count, -1,
1604 -1, stream->stream_fd->fd,
1605 NULL, &stream->stream_fd->fd);
1606 if (ret < 0) {
1607 ERR("Rotating stream output file");
1608 goto end;
1609 }
1610 stream->tracefile_size_current = 0;
d3ecc550 1611 stream->pos_after_last_complete_data_index = 0;
c6db3843 1612 stream->data_rotated = true;
d3ecc550 1613
c6db3843
JG		 1614 if (stream->data_rotated && stream->index_rotated) {
1615 /* Rotation completed; reset its state. */
1616 DBG("Rotation completed for stream %" PRIu64,
1617 stream->stream_handle);
1618 stream->rotate_at_seq_num = -1ULL;
1619 stream->data_rotated = false;
1620 stream->index_rotated = false;
1621 }
d3ecc550
JD		 1622end:
1623 return ret;
1624}
1625
1626/*
1627 * If too much data has been written in a tracefile before we received the
1628 * rotation command, we have to move the excess data to the new tracefile and
1629 * perform the rotation. This can happen because the control and data
1630 * connections are separate, the indexes as well as the commands arrive from
1631 * the control connection and we have no control over the order so we could be
1632 * in a situation where too much data has been received on the data connection
c6db3843 1633 * before the rotation command on the control connection arrives.
d3ecc550
JD		 1634 */
1635static
1636int rotate_truncate_stream(struct relay_stream *stream)
1637{
1638 int ret, new_fd;
a5df8828 1639 off_t lseek_ret;
d3ecc550
JD		 1640 uint64_t diff, pos = 0;
1641 char buf[FILE_COPY_BUFFER_SIZE];
1642
1643 assert(!stream->is_metadata);
1644
1645 assert(stream->tracefile_size_current >
1646 stream->pos_after_last_complete_data_index);
1647 diff = stream->tracefile_size_current -
1648 stream->pos_after_last_complete_data_index;
1649
1650 /* Create the new tracefile. */
1651 new_fd = utils_create_stream_file(stream->path_name,
1652 stream->channel_name,
1653 stream->tracefile_size, stream->tracefile_count,
1654 /* uid */ -1, /* gid */ -1, /* suffix */ NULL);
1655 if (new_fd < 0) {
1656 ERR("Failed to create new stream file at path %s for channel %s",
1657 stream->path_name, stream->channel_name);
1658 ret = -1;
1659 goto end;
1660 }
1661
1662 /*
1663 * Rewind the current tracefile to the position at which the rotation
a9577b76 1664 * should have occurred.
d3ecc550 1665 */
a5df8828 1666 lseek_ret = lseek(stream->stream_fd->fd,
d3ecc550 1667 stream->pos_after_last_complete_data_index, SEEK_SET);
a5df8828 1668 if (lseek_ret < 0) {
d3ecc550 1669 PERROR("seek truncate stream");
a5df8828 1670 ret = -1;
d3ecc550
JD		 1671 goto end;
1672 }
1673
1674 /* Move data from the old file to the new file. */
1675 while (pos < diff) {
1676 uint64_t count, bytes_left;
1677 ssize_t io_ret;
1678
1679 bytes_left = diff - pos;
1680 count = bytes_left > sizeof(buf) ? sizeof(buf) : bytes_left;
1681 assert(count <= SIZE_MAX);
1682
1683 io_ret = lttng_read(stream->stream_fd->fd, buf, count);
1684 if (io_ret < (ssize_t) count) {
1685 char error_string[256];
1686
1687 snprintf(error_string, sizeof(error_string),
1688 "Failed to read %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1689 count, stream->stream_fd->fd, io_ret);
1690 if (io_ret == -1) {
1691 PERROR("%s", error_string);
1692 } else {
1693 ERR("%s", error_string);
1694 }
1695 ret = -1;
1696 goto end;
1697 }
1698
1699 io_ret = lttng_write(new_fd, buf, count);
1700 if (io_ret < (ssize_t) count) {
1701 char error_string[256];
1702
1703 snprintf(error_string, sizeof(error_string),
1704 "Failed to write %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1705 count, new_fd, io_ret);
1706 if (io_ret == -1) {
1707 PERROR("%s", error_string);
1708 } else {
1709 ERR("%s", error_string);
1710 }
1711 ret = -1;
1712 goto end;
1713 }
1714
1715 pos += count;
1716 }
1717
1718 /* Truncate the file to get rid of the excess data. */
1719 ret = ftruncate(stream->stream_fd->fd,
1720 stream->pos_after_last_complete_data_index);
1721 if (ret) {
1722 PERROR("ftruncate");
1723 goto end;
1724 }
1725
1726 ret = close(stream->stream_fd->fd);
1727 if (ret < 0) {
1728 PERROR("Closing tracefile");
1729 goto end;
1730 }
1731
d3ecc550
JD		 1732 /*
1733 * Update the offset and FD of all the eventual indexes created by the
1734 * data connection before the rotation command arrived.
1735 */
1736 ret = relay_index_switch_all_files(stream);
1737 if (ret < 0) {
1738 ERR("Failed to rotate index file");
1739 goto end;
1740 }
1741
1742 stream->stream_fd->fd = new_fd;
1743 stream->tracefile_size_current = diff;
1744 stream->pos_after_last_complete_data_index = 0;
1745 stream->rotate_at_seq_num = -1ULL;
1746
1747 ret = 0;
1748
1749end:
1750 return ret;
1751}
1752
1753/*
c6db3843 1754 * Check if a stream's index file should be rotated (for session rotation).
d3ecc550
JD		 1755 * Must be called with the stream lock held.
1756 *
1757 * Return 0 on success, a negative value on error.
1758 */
1759static
c6db3843 1760int try_rotate_stream_index(struct relay_stream *stream)
d3ecc550
JD		 1761{
1762 int ret = 0;
1763
d3ecc550 1764 if (stream->rotate_at_seq_num == -1ULL) {
c6db3843 1765 /* No rotation expected. */
d3ecc550
JD		 1766 goto end;
1767 }
1768
c6db3843
JG		 1769 if (stream->index_rotated) {
1770 /* Rotation of the index has already occurred. */
1771 goto end;
1772 }
1773
1774 if (stream->prev_index_seq == -1ULL ||
1775 stream->prev_index_seq < stream->rotate_at_seq_num) {
1776 DBG("Stream %" PRIu64 " index not yet ready for rotation (rotate_at_seq_num = %" PRIu64 ", prev_index_seq = %" PRIu64 ")",
1777 stream->stream_handle,
1778 stream->rotate_at_seq_num,
1779 stream->prev_index_seq);
1780 goto end;
1781 } else if (stream->prev_index_seq != stream->rotate_at_seq_num) {
1782 /*
1783 * Unexpected, protocol error/bug.
1784 * It could mean that we received a rotation position
1785 * that is in the past.
1786 */
1787 ERR("Stream %" PRIu64 " index is in an inconsistent state (rotate_at_seq_num = %" PRIu64 ", prev_data_seq = %" PRIu64 ", prev_index_seq = %" PRIu64 ")",
c64c70f5
JG		 1788 stream->stream_handle,
1789 stream->rotate_at_seq_num,
a8f9f353 1790 stream->prev_data_seq,
c64c70f5 1791 stream->prev_index_seq);
c6db3843
JG		 1792 ret = -1;
1793 goto end;
1794 } else {
1795 DBG("Rotating stream %" PRIu64 " index file",
1796 stream->stream_handle);
1797 ret = create_rotate_index_file(stream, stream->path_name);
1798 stream->index_rotated = true;
1799
1800 if (stream->data_rotated && stream->index_rotated) {
1801 /* Rotation completed; reset its state. */
1802 DBG("Rotation completed for stream %" PRIu64,
1803 stream->stream_handle);
1804 stream->rotate_at_seq_num = -1ULL;
1805 stream->data_rotated = false;
1806 stream->index_rotated = false;
1807 }
1808 }
1809
1810end:
1811 return ret;
1812}
1813
1814/*
1815 * Check if a stream's data file (as opposed to index) should be rotated
1816 * (for session rotation).
1817 * Must be called with the stream lock held.
1818 *
1819 * Return 0 on success, a negative value on error.
1820 */
1821static
1822int try_rotate_stream_data(struct relay_stream *stream)
1823{
1824 int ret = 0;
1825
1826 if (stream->rotate_at_seq_num == -1ULL) {
1827 /* No rotation expected. */
1828 goto end;
1829 }
1830
1831 if (stream->data_rotated) {
1832 /* Rotation of the data file has already occurred. */
1833 goto end;
1834 }
1835
1836 if (stream->prev_data_seq == -1ULL ||
1837 stream->prev_data_seq < stream->rotate_at_seq_num) {
1838 DBG("Stream %" PRIu64 " not yet ready for rotation (rotate_at_seq_num = %" PRIu64 ", prev_data_seq = %" PRIu64 ")",
1839 stream->stream_handle,
1840 stream->rotate_at_seq_num,
1841 stream->prev_data_seq);
d3ecc550 1842 goto end;
a8f9f353 1843 } else if (stream->prev_data_seq > stream->rotate_at_seq_num) {
c64c70f5 1844 /*
a8f9f353 1845 * prev_data_seq is checked here since indexes and rotation
c64c70f5
JG		 1846 * commands are serialized with respect to each other.
1847 */
d3ecc550
JD		 1848 DBG("Rotation after too much data has been written in tracefile "
1849 "for stream %" PRIu64 ", need to truncate before "
1850 "rotating", stream->stream_handle);
1851 ret = rotate_truncate_stream(stream);
1852 if (ret) {
1853 ERR("Failed to truncate stream");
1854 goto end;
1855 }
c6db3843
JG		 1856 } else if (stream->prev_data_seq != stream->rotate_at_seq_num) {
1857 /*
1858 * Unexpected, protocol error/bug.
1859 * It could mean that we received a rotation position
1860 * that is in the past.
1861 */
1862 ERR("Stream %" PRIu64 " data is in an inconsistent state (rotate_at_seq_num = %" PRIu64 ", prev_data_seq = %" PRIu64 ")",
c64c70f5
JG		 1863 stream->stream_handle,
1864 stream->rotate_at_seq_num,
c6db3843
JG		 1865 stream->prev_data_seq);
1866 ret = -1;
1867 goto end;
1868 } else {
1869 ret = do_rotate_stream_data(stream);
d3ecc550
JD		 1870 }
1871
1872end:
1873 return ret;
1874}
1875
b8aa1682 1876/*
7591bab1 1877 * relay_recv_metadata: receive the metadata for the session.
b8aa1682 1878 */
5312a3ed
JG		 1879static int relay_recv_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1880 struct relay_connection *conn,
1881 const struct lttng_buffer_view *payload)
b8aa1682 1882{
32d1569c 1883 int ret = 0;
6cd525e8 1884 ssize_t size_ret;
58eb9381 1885 struct relay_session *session = conn->session;
5312a3ed 1886 struct lttcomm_relayd_metadata_payload metadata_payload_header;
b8aa1682 1887 struct relay_stream *metadata_stream;
5312a3ed 1888 uint64_t metadata_payload_size;
b8aa1682
JD		 1889
1890 if (!session) {
1891 ERR("Metadata sent before version check");
1892 ret = -1;
1893 goto end;
1894 }
1895
5312a3ed 1896 if (recv_hdr->data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
f6416125
MD		 1897 ERR("Incorrect data size");
1898 ret = -1;
1899 goto end;
1900 }
5312a3ed
JG		 1901 metadata_payload_size = recv_hdr->data_size -
1902 sizeof(struct lttcomm_relayd_metadata_payload);
f6416125 1903
5312a3ed
JG		 1904 memcpy(&metadata_payload_header, payload->data,
1905 sizeof(metadata_payload_header));
1906 metadata_payload_header.stream_id = be64toh(
1907 metadata_payload_header.stream_id);
1908 metadata_payload_header.padding_size = be32toh(
1909 metadata_payload_header.padding_size);
9d1bbf21 1910
5312a3ed 1911 metadata_stream = stream_get_by_id(metadata_payload_header.stream_id);
b8aa1682
JD		 1912 if (!metadata_stream) {
1913 ret = -1;
7591bab1 1914 goto end;
b8aa1682
JD		 1915 }
1916
7591bab1
MD		 1917 pthread_mutex_lock(&metadata_stream->lock);
1918
5312a3ed
JG		 1919 size_ret = lttng_write(metadata_stream->stream_fd->fd,
1920 payload->data + sizeof(metadata_payload_header),
1921 metadata_payload_size);
1922 if (size_ret < metadata_payload_size) {
b8aa1682
JD		 1923 ERR("Relay error writing metadata on file");
1924 ret = -1;
7591bab1 1925 goto end_put;
b8aa1682 1926 }
1d4dfdef 1927
32d1569c 1928 size_ret = write_padding_to_file(metadata_stream->stream_fd->fd,
5312a3ed 1929 metadata_payload_header.padding_size);
715e6fb1 1930 if (size_ret < (int64_t) metadata_payload_header.padding_size) {
5312a3ed 1931 ret = -1;
7591bab1 1932 goto end_put;
1d4dfdef 1933 }
2a174661 1934
7591bab1 1935 metadata_stream->metadata_received +=
5312a3ed 1936 metadata_payload_size + metadata_payload_header.padding_size;
7591bab1
MD		 1937 DBG2("Relay metadata written. Updated metadata_received %" PRIu64,
1938 metadata_stream->metadata_received);
1d4dfdef 1939
c6db3843 1940 ret = try_rotate_stream_data(metadata_stream);
d3ecc550
JD		 1941 if (ret < 0) {
1942 goto end_put;
1943 }
1944
7591bab1
MD		 1945end_put:
1946 pthread_mutex_unlock(&metadata_stream->lock);
1947 stream_put(metadata_stream);
b8aa1682
JD		 1948end:
1949 return ret;
1950}
1951
1952/*
1953 * relay_send_version: send relayd version number
1954 */
5312a3ed
JG		 1955static int relay_send_version(const struct lttcomm_relayd_hdr *recv_hdr,
1956 struct relay_connection *conn,
1957 const struct lttng_buffer_view *payload)
b8aa1682 1958{
7f51dcba 1959 int ret;
5312a3ed 1960 ssize_t send_ret;
092b6259 1961 struct lttcomm_relayd_version reply, msg;
87cb6359 1962 bool compatible = true;
b8aa1682 1963
5312a3ed 1964 conn->version_check_done = true;
b8aa1682 1965
092b6259 1966 /* Get version from the other side. */
5312a3ed
JG		 1967 if (payload->size < sizeof(msg)) {
1968 ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
1969 sizeof(msg), payload->size);
092b6259 1970 ret = -1;
092b6259
DG		 1971 goto end;
1972 }
1973
5312a3ed
JG		 1974 memcpy(&msg, payload->data, sizeof(msg));
1975 msg.major = be32toh(msg.major);
1976 msg.minor = be32toh(msg.minor);
1977
53efb85a 1978 memset(&reply, 0, sizeof(reply));
d83a952c
MD		 1979 reply.major = RELAYD_VERSION_COMM_MAJOR;
1980 reply.minor = RELAYD_VERSION_COMM_MINOR;
d4519fa3
JD		 1981
1982 /* Major versions must be the same */
5312a3ed 1983 if (reply.major != msg.major) {
6151a90f 1984 DBG("Incompatible major versions (%u vs %u), deleting session",
5312a3ed 1985 reply.major, msg.major);
87cb6359 1986 compatible = false;
d4519fa3
JD		 1987 }
1988
58eb9381 1989 conn->major = reply.major;
0f907de1 1990 /* We adapt to the lowest compatible version */
5312a3ed 1991 if (reply.minor <= msg.minor) {
58eb9381 1992 conn->minor = reply.minor;
0f907de1 1993 } else {
5312a3ed 1994 conn->minor = msg.minor;
0f907de1
JD		 1995 }
1996
6151a90f
JD		 1997 reply.major = htobe32(reply.major);
1998 reply.minor = htobe32(reply.minor);
5312a3ed
JG		 1999 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2000 sizeof(reply), 0);
2001 if (send_ret < (ssize_t) sizeof(reply)) {
2002 ERR("Failed to send \"send version\" command reply (ret = %zd)",
2003 send_ret);
2004 ret = -1;
2005 goto end;
2006 } else {
2007 ret = 0;
6151a90f
JD		 2008 }
2009
87cb6359
JD		 2010 if (!compatible) {
2011 ret = -1;
2012 goto end;
2013 }
2014
58eb9381
DG		 2015 DBG("Version check done using protocol %u.%u", conn->major,
2016 conn->minor);
b8aa1682
JD		 2017
2018end:
2019 return ret;
2020}
2021
c8f59ee5 2022/*
6d805429 2023 * Check for data pending for a given stream id from the session daemon.
c8f59ee5 2024 */
5312a3ed
JG		 2025static int relay_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2026 struct relay_connection *conn,
2027 const struct lttng_buffer_view *payload)
c8f59ee5 2028{
58eb9381 2029 struct relay_session *session = conn->session;
6d805429 2030 struct lttcomm_relayd_data_pending msg;
c8f59ee5
DG		 2031 struct lttcomm_relayd_generic_reply reply;
2032 struct relay_stream *stream;
5312a3ed 2033 ssize_t send_ret;
c8f59ee5 2034 int ret;
298a25ca 2035 uint64_t stream_seq;
c8f59ee5 2036
6d805429 2037 DBG("Data pending command received");
c8f59ee5 2038
5312a3ed 2039 if (!session || !conn->version_check_done) {
c8f59ee5
DG		 2040 ERR("Trying to check for data before version check");
2041 ret = -1;
2042 goto end_no_session;
2043 }
2044
5312a3ed
JG		 2045 if (payload->size < sizeof(msg)) {
2046 ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
2047 sizeof(msg), payload->size);
c8f59ee5
DG		 2048 ret = -1;
2049 goto end_no_session;
2050 }
5312a3ed
JG		 2051 memcpy(&msg, payload->data, sizeof(msg));
2052 msg.stream_id = be64toh(msg.stream_id);
2053 msg.last_net_seq_num = be64toh(msg.last_net_seq_num);
c8f59ee5 2054
5312a3ed 2055 stream = stream_get_by_id(msg.stream_id);
de91f48a 2056 if (stream == NULL) {
c8f59ee5 2057 ret = -1;
7591bab1 2058 goto end;
c8f59ee5
DG		 2059 }
2060
7591bab1
MD		 2061 pthread_mutex_lock(&stream->lock);
2062
298a25ca
JG		 2063 if (session_streams_have_index(session)) {
2064 /*
2065 * Ensure that both the index and stream data have been
2066 * flushed up to the requested point.
2067 */
a8f9f353 2068 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 2069 } else {
a8f9f353 2070 stream_seq = stream->prev_data_seq;
298a25ca 2071 }
a8f9f353 2072 DBG("Data pending for stream id %" PRIu64 ": prev_data_seq %" PRIu64
298a25ca
JG		 2073 ", prev_index_seq %" PRIu64
2074 ", and last_seq %" PRIu64, msg.stream_id,
a8f9f353 2075 stream->prev_data_seq, stream->prev_index_seq,
298a25ca 2076 msg.last_net_seq_num);
c8f59ee5 2077
33832e64 2078 /* Avoid wrapping issue */
298a25ca 2079 if (((int64_t) (stream_seq - msg.last_net_seq_num)) >= 0) {
6d805429 2080 /* Data has in fact been written and is NOT pending */
c8f59ee5 2081 ret = 0;
6d805429
DG		 2082 } else {
2083 /* Data still being streamed thus pending */
2084 ret = 1;
c8f59ee5
DG		 2085 }
2086
7591bab1
MD		 2087 stream->data_pending_check_done = true;
2088 pthread_mutex_unlock(&stream->lock);
f7079f67 2089
7591bab1
MD		 2090 stream_put(stream);
2091end:
c8f59ee5 2092
53efb85a 2093 memset(&reply, 0, sizeof(reply));
c8f59ee5 2094 reply.ret_code = htobe32(ret);
5312a3ed
JG		 2095 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2096 if (send_ret < (ssize_t) sizeof(reply)) {
2097 ERR("Failed to send \"data pending\" command reply (ret = %zd)",
2098 send_ret);
2099 ret = -1;
c8f59ee5
DG		 2100 }
2101
2102end_no_session:
2103 return ret;
2104}
2105
2106/*
2107 * Wait for the control socket to reach a quiescent state.
2108 *
7591bab1
MD		 2109 * Note that for now, when receiving this command from the session
2110 * daemon, this means that every subsequent commands or data received on
2111 * the control socket has been handled. So, this is why we simply return
2112 * OK here.
c8f59ee5 2113 */
5312a3ed
JG		 2114static int relay_quiescent_control(const struct lttcomm_relayd_hdr *recv_hdr,
2115 struct relay_connection *conn,
2116 const struct lttng_buffer_view *payload)
c8f59ee5
DG		 2117{
2118 int ret;
5312a3ed 2119 ssize_t send_ret;
ad7051c0 2120 struct relay_stream *stream;
ad7051c0 2121 struct lttcomm_relayd_quiescent_control msg;
c8f59ee5
DG		 2122 struct lttcomm_relayd_generic_reply reply;
2123
2124 DBG("Checking quiescent state on control socket");
2125
5312a3ed 2126 if (!conn->session || !conn->version_check_done) {
ad7051c0
DG		 2127 ERR("Trying to check for data before version check");
2128 ret = -1;
2129 goto end_no_session;
2130 }
2131
5312a3ed
JG		 2132 if (payload->size < sizeof(msg)) {
2133 ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
2134 sizeof(msg), payload->size);
ad7051c0
DG		 2135 ret = -1;
2136 goto end_no_session;
2137 }
5312a3ed
JG		 2138 memcpy(&msg, payload->data, sizeof(msg));
2139 msg.stream_id = be64toh(msg.stream_id);
ad7051c0 2140
5312a3ed 2141 stream = stream_get_by_id(msg.stream_id);
7591bab1
MD		 2142 if (!stream) {
2143 goto reply;
2144 }
2145 pthread_mutex_lock(&stream->lock);
2146 stream->data_pending_check_done = true;
2147 pthread_mutex_unlock(&stream->lock);
5312a3ed
JG		 2148
2149 DBG("Relay quiescent control pending flag set to %" PRIu64, msg.stream_id);
7591bab1
MD		 2150 stream_put(stream);
2151reply:
53efb85a 2152 memset(&reply, 0, sizeof(reply));
c8f59ee5 2153 reply.ret_code = htobe32(LTTNG_OK);
5312a3ed
JG		 2154 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2155 if (send_ret < (ssize_t) sizeof(reply)) {
2156 ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
2157 send_ret);
2158 ret = -1;
2159 } else {
2160 ret = 0;
c8f59ee5
DG		 2161 }
2162
ad7051c0 2163end_no_session:
c8f59ee5
DG		 2164 return ret;
2165}
2166
f7079f67 2167/*
7591bab1
MD		 2168 * Initialize a data pending command. This means that a consumer is about
2169 * to ask for data pending for each stream it holds. Simply iterate over
2170 * all streams of a session and set the data_pending_check_done flag.
f7079f67
DG		 2171 *
2172 * This command returns to the client a LTTNG_OK code.
2173 */
5312a3ed
JG		 2174static int relay_begin_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2175 struct relay_connection *conn,
2176 const struct lttng_buffer_view *payload)
f7079f67
DG		 2177{
2178 int ret;
5312a3ed 2179 ssize_t send_ret;
f7079f67
DG		 2180 struct lttng_ht_iter iter;
2181 struct lttcomm_relayd_begin_data_pending msg;
2182 struct lttcomm_relayd_generic_reply reply;
2183 struct relay_stream *stream;
f7079f67
DG		 2184
2185 assert(recv_hdr);
58eb9381 2186 assert(conn);
f7079f67
DG		 2187
2188 DBG("Init streams for data pending");
2189
5312a3ed 2190 if (!conn->session || !conn->version_check_done) {
f7079f67
DG		 2191 ERR("Trying to check for data before version check");
2192 ret = -1;
2193 goto end_no_session;
2194 }
2195
5312a3ed
JG		 2196 if (payload->size < sizeof(msg)) {
2197 ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
2198 sizeof(msg), payload->size);
f7079f67
DG		 2199 ret = -1;
2200 goto end_no_session;
2201 }
5312a3ed
JG		 2202 memcpy(&msg, payload->data, sizeof(msg));
2203 msg.session_id = be64toh(msg.session_id);
f7079f67
DG		 2204
2205 /*
7591bab1
MD		 2206 * Iterate over all streams to set the begin data pending flag.
2207 * For now, the streams are indexed by stream handle so we have
2208 * to iterate over all streams to find the one associated with
2209 * the right session_id.
f7079f67
DG		 2210 */
2211 rcu_read_lock();
d3e2ba59 2212 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2213 node.node) {
7591bab1
MD		 2214 if (!stream_get(stream)) {
2215 continue;
2216 }
5312a3ed 2217 if (stream->trace->session->id == msg.session_id) {
7591bab1
MD		 2218 pthread_mutex_lock(&stream->lock);
2219 stream->data_pending_check_done = false;
2220 pthread_mutex_unlock(&stream->lock);
f7079f67
DG		 2221 DBG("Set begin data pending flag to stream %" PRIu64,
2222 stream->stream_handle);
2223 }
7591bab1 2224 stream_put(stream);
f7079f67
DG		 2225 }
2226 rcu_read_unlock();
2227
53efb85a 2228 memset(&reply, 0, sizeof(reply));
f7079f67
DG		 2229 /* All good, send back reply. */
2230 reply.ret_code = htobe32(LTTNG_OK);
2231
5312a3ed
JG		 2232 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2233 if (send_ret < (ssize_t) sizeof(reply)) {
2234 ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
2235 send_ret);
2236 ret = -1;
2237 } else {
2238 ret = 0;
f7079f67
DG		 2239 }
2240
2241end_no_session:
2242 return ret;
2243}
2244
2245/*
7591bab1
MD		 2246 * End data pending command. This will check, for a given session id, if
2247 * each stream associated with it has its data_pending_check_done flag
2248 * set. If not, this means that the client lost track of the stream but
2249 * the data is still being streamed on our side. In this case, we inform
2250 * the client that data is in flight.
f7079f67
DG		 2251 *
2252 * Return to the client if there is data in flight or not with a ret_code.
2253 */
5312a3ed
JG		 2254static int relay_end_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2255 struct relay_connection *conn,
2256 const struct lttng_buffer_view *payload)
f7079f67
DG		 2257{
2258 int ret;
5312a3ed 2259 ssize_t send_ret;
f7079f67
DG		 2260 struct lttng_ht_iter iter;
2261 struct lttcomm_relayd_end_data_pending msg;
2262 struct lttcomm_relayd_generic_reply reply;
2263 struct relay_stream *stream;
f7079f67
DG		 2264 uint32_t is_data_inflight = 0;
2265
f7079f67
DG		 2266 DBG("End data pending command");
2267
5312a3ed 2268 if (!conn->session || !conn->version_check_done) {
f7079f67
DG		 2269 ERR("Trying to check for data before version check");
2270 ret = -1;
2271 goto end_no_session;
2272 }
2273
5312a3ed
JG		 2274 if (payload->size < sizeof(msg)) {
2275 ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
2276 sizeof(msg), payload->size);
f7079f67
DG		 2277 ret = -1;
2278 goto end_no_session;
2279 }
5312a3ed
JG		 2280 memcpy(&msg, payload->data, sizeof(msg));
2281 msg.session_id = be64toh(msg.session_id);
f7079f67 2282
7591bab1
MD		 2283 /*
2284 * Iterate over all streams to see if the begin data pending
2285 * flag is set.
2286 */
f7079f67 2287 rcu_read_lock();
d3e2ba59 2288 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2289 node.node) {
7591bab1
MD		 2290 if (!stream_get(stream)) {
2291 continue;
2292 }
5312a3ed 2293 if (stream->trace->session->id != msg.session_id) {
7591bab1
MD		 2294 stream_put(stream);
2295 continue;
2296 }
2297 pthread_mutex_lock(&stream->lock);
2298 if (!stream->data_pending_check_done) {
298a25ca
JG		 2299 uint64_t stream_seq;
2300
2301 if (session_streams_have_index(conn->session)) {
2302 /*
2303 * Ensure that both the index and stream data have been
2304 * flushed up to the requested point.
2305 */
a8f9f353 2306 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 2307 } else {
a8f9f353 2308 stream_seq = stream->prev_data_seq;
298a25ca
JG		 2309 }
2310 if (!stream->closed || !(((int64_t) (stream_seq - stream->last_net_seq_num)) >= 0)) {
7591bab1
MD		 2311 is_data_inflight = 1;
2312 DBG("Data is still in flight for stream %" PRIu64,
2313 stream->stream_handle);
2314 pthread_mutex_unlock(&stream->lock);
2315 stream_put(stream);
2316 break;
2317 }
f7079f67 2318 }
7591bab1
MD		 2319 pthread_mutex_unlock(&stream->lock);
2320 stream_put(stream);
f7079f67
DG		 2321 }
2322 rcu_read_unlock();
2323
53efb85a 2324 memset(&reply, 0, sizeof(reply));
f7079f67
DG		 2325 /* All good, send back reply. */
2326 reply.ret_code = htobe32(is_data_inflight);
2327
5312a3ed
JG		 2328 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2329 if (send_ret < (ssize_t) sizeof(reply)) {
2330 ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
2331 send_ret);
2332 ret = -1;
2333 } else {
2334 ret = 0;
f7079f67
DG		 2335 }
2336
2337end_no_session:
2338 return ret;
2339}
2340
1c20f0e2
JD		 2341/*
2342 * Receive an index for a specific stream.
2343 *
2344 * Return 0 on success else a negative value.
2345 */
5312a3ed
JG		 2346static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
2347 struct relay_connection *conn,
2348 const struct lttng_buffer_view *payload)
1c20f0e2 2349{
5312a3ed
JG		 2350 int ret;
2351 ssize_t send_ret;
58eb9381 2352 struct relay_session *session = conn->session;
1c20f0e2 2353 struct lttcomm_relayd_index index_info;
7591bab1 2354 struct relay_index *index;
1c20f0e2
JD		 2355 struct lttcomm_relayd_generic_reply reply;
2356 struct relay_stream *stream;
f8f3885c 2357 size_t msg_len;
1c20f0e2 2358
58eb9381 2359 assert(conn);
1c20f0e2
JD		 2360
2361 DBG("Relay receiving index");
2362
5312a3ed 2363 if (!session || !conn->version_check_done) {
1c20f0e2
JD		 2364 ERR("Trying to close a stream before version check");
2365 ret = -1;
2366 goto end_no_session;
2367 }
2368
f8f3885c
MD		 2369 msg_len = lttcomm_relayd_index_len(
2370 lttng_to_index_major(conn->major, conn->minor),
2371 lttng_to_index_minor(conn->major, conn->minor));
5312a3ed
JG		 2372 if (payload->size < msg_len) {
2373 ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
2374 msg_len, payload->size);
1c20f0e2
JD		 2375 ret = -1;
2376 goto end_no_session;
2377 }
5312a3ed
JG		 2378 memcpy(&index_info, payload->data, msg_len);
2379 index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
2380 index_info.net_seq_num = be64toh(index_info.net_seq_num);
2381 index_info.packet_size = be64toh(index_info.packet_size);
2382 index_info.content_size = be64toh(index_info.content_size);
2383 index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
2384 index_info.timestamp_end = be64toh(index_info.timestamp_end);
2385 index_info.events_discarded = be64toh(index_info.events_discarded);
2386 index_info.stream_id = be64toh(index_info.stream_id);
81df238b
JR		 2387
2388 if (conn->minor >= 8) {
2389 index_info.stream_instance_id =
2390 be64toh(index_info.stream_instance_id);
2391 index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
2392 }
5312a3ed
JG		 2393
2394 stream = stream_get_by_id(index_info.relay_stream_id);
1c20f0e2 2395 if (!stream) {
7591bab1 2396 ERR("stream_get_by_id not found");
1c20f0e2 2397 ret = -1;
7591bab1 2398 goto end;
1c20f0e2 2399 }
7591bab1 2400 pthread_mutex_lock(&stream->lock);
1c20f0e2 2401
d3e2ba59
JD		 2402 /* Live beacon handling */
2403 if (index_info.packet_size == 0) {
7591bab1
MD		 2404 DBG("Received live beacon for stream %" PRIu64,
2405 stream->stream_handle);
d3e2ba59
JD		 2406
2407 /*
7591bab1
MD		 2408 * Only flag a stream inactive when it has already
2409 * received data and no indexes are in flight.
d3e2ba59 2410 */
a44ca2ca 2411 if (stream->index_received_seqcount > 0
7591bab1 2412 && stream->indexes_in_flight == 0) {
5312a3ed 2413 stream->beacon_ts_end = index_info.timestamp_end;
d3e2ba59
JD		 2414 }
2415 ret = 0;
7591bab1 2416 goto end_stream_put;
d3e2ba59
JD		 2417 } else {
2418 stream->beacon_ts_end = -1ULL;
2419 }
2420
528f2ffa 2421 if (stream->ctf_stream_id == -1ULL) {
5312a3ed 2422 stream->ctf_stream_id = index_info.stream_id;
528f2ffa 2423 }
5312a3ed 2424 index = relay_index_get_by_id_or_create(stream, index_info.net_seq_num);
7591bab1
MD		 2425 if (!index) {
2426 ret = -1;
2427 ERR("relay_index_get_by_id_or_create index NULL");
2428 goto end_stream_put;
1c20f0e2 2429 }
234cd636 2430 if (set_index_control_data(index, &index_info, conn)) {
7591bab1
MD		 2431 ERR("set_index_control_data error");
2432 relay_index_put(index);
2433 ret = -1;
2434 goto end_stream_put;
2435 }
2436 ret = relay_index_try_flush(index);
2437 if (ret == 0) {
a44ca2ca
MD		 2438 tracefile_array_commit_seq(stream->tfa);
2439 stream->index_received_seqcount++;
d3ecc550 2440 stream->pos_after_last_complete_data_index += index->total_size;
7a45c7e6 2441 stream->prev_index_seq = index_info.net_seq_num;
c6db3843
JG		 2442
2443 ret = try_rotate_stream_index(stream);
2444 if (ret < 0) {
2445 goto end_stream_put;
2446 }
7591bab1
MD		 2447 } else if (ret > 0) {
2448 /* no flush. */
2449 ret = 0;
2450 } else {
245f8bec
JR		 2451 /*
2452 * ret < 0
2453 *
2454 * relay_index_try_flush is responsible for the self-reference
2455 * put of the index object on error.
2456 */
7591bab1 2457 ERR("relay_index_try_flush error %d", ret);
7591bab1 2458 ret = -1;
1c20f0e2
JD		 2459 }
2460
7591bab1
MD		 2461end_stream_put:
2462 pthread_mutex_unlock(&stream->lock);
2463 stream_put(stream);
2464
2465end:
1c20f0e2 2466
53efb85a 2467 memset(&reply, 0, sizeof(reply));
1c20f0e2
JD		 2468 if (ret < 0) {
2469 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2470 } else {
2471 reply.ret_code = htobe32(LTTNG_OK);
2472 }
58eb9381 2473 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 2474 if (send_ret < (ssize_t) sizeof(reply)) {
2475 ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
2476 ret = -1;
1c20f0e2
JD		 2477 }
2478
2479end_no_session:
2480 return ret;
2481}
2482
a4baae1b
JD		 2483/*
2484 * Receive the streams_sent message.
2485 *
2486 * Return 0 on success else a negative value.
2487 */
5312a3ed
JG		 2488static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
2489 struct relay_connection *conn,
2490 const struct lttng_buffer_view *payload)
a4baae1b 2491{
5312a3ed
JG		 2492 int ret;
2493 ssize_t send_ret;
a4baae1b
JD		 2494 struct lttcomm_relayd_generic_reply reply;
2495
58eb9381 2496 assert(conn);
a4baae1b
JD		 2497
2498 DBG("Relay receiving streams_sent");
2499
5312a3ed 2500 if (!conn->session || !conn->version_check_done) {
a4baae1b
JD		 2501 ERR("Trying to close a stream before version check");
2502 ret = -1;
2503 goto end_no_session;
2504 }
2505
2506 /*
7591bab1
MD		 2507 * Publish every pending stream in the connection recv list which are
2508 * now ready to be used by the viewer.
4a9daf17 2509 */
7591bab1 2510 publish_connection_local_streams(conn);
4a9daf17 2511
53efb85a 2512 memset(&reply, 0, sizeof(reply));
a4baae1b 2513 reply.ret_code = htobe32(LTTNG_OK);
58eb9381 2514 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 2515 if (send_ret < (ssize_t) sizeof(reply)) {
2516 ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
2517 send_ret);
2518 ret = -1;
a4baae1b
JD		 2519 } else {
2520 /* Success. */
2521 ret = 0;
2522 }
2523
2524end_no_session:
2525 return ret;
2526}
2527
d3ecc550 2528/*
5312a3ed 2529 * relay_rotate_session_stream: rotate a stream to a new tracefile for the session
d3ecc550
JD		 2530 * rotation feature (not the tracefile rotation feature).
2531 */
5312a3ed
JG		 2532static int relay_rotate_session_stream(const struct lttcomm_relayd_hdr *recv_hdr,
2533 struct relay_connection *conn,
2534 const struct lttng_buffer_view *payload)
d3ecc550 2535{
5312a3ed
JG		 2536 int ret;
2537 ssize_t send_ret;
d3ecc550
JD		 2538 struct relay_session *session = conn->session;
2539 struct lttcomm_relayd_rotate_stream stream_info;
2540 struct lttcomm_relayd_generic_reply reply;
2541 struct relay_stream *stream;
5312a3ed
JG		 2542 size_t header_len;
2543 size_t path_len;
2544 struct lttng_buffer_view new_path_view;
d3ecc550
JD		 2545
2546 DBG("Rotate stream received");
2547
2548 if (!session || !conn->version_check_done) {
2549 ERR("Trying to rotate a stream before version check");
2550 ret = -1;
2551 goto end_no_reply;
2552 }
2553
2554 if (session->major == 2 && session->minor < 11) {
2555 ERR("Unsupported feature before 2.11");
2556 ret = -1;
2557 goto end_no_reply;
2558 }
2559
5312a3ed 2560 header_len = sizeof(struct lttcomm_relayd_rotate_stream);
d3ecc550 2561
5312a3ed
JG		 2562 if (payload->size < header_len) {
2563 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
2564 header_len, payload->size);
d3ecc550
JD		 2565 ret = -1;
2566 goto end_no_reply;
2567 }
2568
5312a3ed
JG		 2569 memcpy(&stream_info, payload->data, header_len);
2570
2571 /* Convert to host */
2572 stream_info.pathname_length = be32toh(stream_info.pathname_length);
2573 stream_info.stream_id = be64toh(stream_info.stream_id);
2574 stream_info.new_chunk_id = be64toh(stream_info.new_chunk_id);
2575 stream_info.rotate_at_seq_num = be64toh(stream_info.rotate_at_seq_num);
d3ecc550 2576
5312a3ed
JG		 2577 path_len = stream_info.pathname_length;
2578 if (payload->size < header_len + path_len) {
2579 ERR("Unexpected payload size in \"relay_rotate_session_stream\" including path: expected >= %zu bytes, got %zu bytes",
2580 header_len + path_len, payload->size);
2581 ret = -1;
2582 goto end_no_reply;
2583 }
2584
d3ecc550 2585 /* Ensure it fits in local filename length. */
5312a3ed 2586 if (path_len >= LTTNG_PATH_MAX) {
d3ecc550
JD		 2587 ret = -ENAMETOOLONG;
2588 ERR("Length of relay_rotate_session_stream command's path name (%zu bytes) exceeds the maximal allowed length of %i bytes",
5312a3ed 2589 path_len, LTTNG_PATH_MAX);
d3ecc550
JD		 2590 goto end;
2591 }
2592
5312a3ed
JG		 2593 new_path_view = lttng_buffer_view_from_view(payload, header_len,
2594 stream_info.pathname_length);
d3ecc550 2595
5312a3ed
JG		 2596 stream = stream_get_by_id(stream_info.stream_id);
2597 if (!stream) {
d3ecc550 2598 ret = -1;
5312a3ed 2599 goto end;
d3ecc550
JD		 2600 }
2601
2602 pthread_mutex_lock(&stream->lock);
2603
2604 /*
2605 * Update the trace path (just the folder, the stream name does not
2606 * change).
2607 */
cb523e02
JG		 2608 free(stream->prev_path_name);
2609 stream->prev_path_name = stream->path_name;
5312a3ed 2610 stream->path_name = create_output_path(new_path_view.data);
d3ecc550
JD		 2611 if (!stream->path_name) {
2612 ERR("Failed to create a new output path");
5312a3ed 2613 ret = -1;
d3ecc550
JD		 2614 goto end_stream_unlock;
2615 }
2616 ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG,
2617 -1, -1);
2618 if (ret < 0) {
2619 ERR("relay creating output directory");
5312a3ed 2620 ret = -1;
d3ecc550
JD		 2621 goto end_stream_unlock;
2622 }
5312a3ed 2623
81164b6b
JG		 2624 assert(stream->current_chunk_id.is_set);
2625 stream->current_chunk_id.value = stream_info.new_chunk_id;
d3ecc550
JD		 2626
2627 if (stream->is_metadata) {
c6db3843
JG		 2628 /*
2629 * Metadata streams have no index; consider its rotation
2630 * complete.
2631 */
2632 stream->index_rotated = true;
d3ecc550
JD		 2633 /*
2634 * The metadata stream is sent only over the control connection
2635 * so we know we have all the data to perform the stream
2636 * rotation.
2637 */
c6db3843 2638 ret = do_rotate_stream_data(stream);
d3ecc550 2639 } else {
5312a3ed 2640 stream->rotate_at_seq_num = stream_info.rotate_at_seq_num;
c6db3843
JG		 2641 ret = try_rotate_stream_data(stream);
2642 if (ret < 0) {
2643 goto end_stream_unlock;
2644 }
2645
2646 ret = try_rotate_stream_index(stream);
2647 if (ret < 0) {
2648 goto end_stream_unlock;
2649 }
d3ecc550
JD		 2650 }
2651
2652end_stream_unlock:
2653 pthread_mutex_unlock(&stream->lock);
2654 stream_put(stream);
2655end:
2656 memset(&reply, 0, sizeof(reply));
2657 if (ret < 0) {
2658 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2659 } else {
2660 reply.ret_code = htobe32(LTTNG_OK);
2661 }
2662 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2663 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 2664 if (send_ret < (ssize_t) sizeof(reply)) {
2665 ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
2666 send_ret);
2667 ret = -1;
d3ecc550
JD		 2668 }
2669
2670end_no_reply:
d3ecc550
JD		 2671 return ret;
2672}
2673
a1ae2ea5
JD		 2674/*
2675 * relay_mkdir: Create a folder on the disk.
2676 */
5312a3ed
JG		 2677static int relay_mkdir(const struct lttcomm_relayd_hdr *recv_hdr,
2678 struct relay_connection *conn,
2679 const struct lttng_buffer_view *payload)
a1ae2ea5
JD		 2680{
2681 int ret;
a1ae2ea5
JD		 2682 struct relay_session *session = conn->session;
2683 struct lttcomm_relayd_mkdir path_info_header;
a1ae2ea5
JD		 2684 struct lttcomm_relayd_generic_reply reply;
2685 char *path = NULL;
5312a3ed
JG		 2686 size_t header_len;
2687 ssize_t send_ret;
2688 struct lttng_buffer_view path_view;
a1ae2ea5
JD		 2689
2690 if (!session || !conn->version_check_done) {
00fb02ac 2691 ERR("Trying to create a directory before version check");
a1ae2ea5
JD		 2692 ret = -1;
2693 goto end_no_session;
2694 }
2695
2696 if (session->major == 2 && session->minor < 11) {
2697 /*
2698 * This client is not supposed to use this command since
2699 * it predates its introduction.
2700 */
2701 ERR("relay_mkdir command is unsupported before LTTng 2.11");
2702 ret = -1;
2703 goto end_no_session;
2704 }
2705
5312a3ed
JG		 2706 header_len = sizeof(path_info_header);
2707 if (payload->size < header_len) {
2708 ERR("Unexpected payload size in \"relay_mkdir\": expected >= %zu bytes, got %zu bytes",
2709 header_len, payload->size);
a1ae2ea5
JD		 2710 ret = -1;
2711 goto end_no_session;
2712 }
2713
5312a3ed
JG		 2714 memcpy(&path_info_header, payload->data, header_len);
2715
a1ae2ea5
JD		 2716 path_info_header.length = be32toh(path_info_header.length);
2717
5312a3ed
JG		 2718 if (payload->size < header_len + path_info_header.length) {
2719 ERR("Unexpected payload size in \"relay_mkdir\" including path: expected >= %zu bytes, got %zu bytes",
2720 header_len + path_info_header.length, payload->size);
2721 ret = -1;
2722 goto end_no_session;
2723 }
2724
a1ae2ea5
JD		 2725 /* Ensure that it fits in local path length. */
2726 if (path_info_header.length >= LTTNG_PATH_MAX) {
2727 ret = -ENAMETOOLONG;
2728 ERR("Path name argument of mkdir command (%" PRIu32 " bytes) exceeds the maximal length allowed (%d bytes)",
2729 path_info_header.length, LTTNG_PATH_MAX);
2730 goto end;
2731 }
2732
5312a3ed
JG		 2733 path_view = lttng_buffer_view_from_view(payload, header_len,
2734 path_info_header.length);
a1ae2ea5 2735
5312a3ed 2736 path = create_output_path(path_view.data);
a1ae2ea5
JD		 2737 if (!path) {
2738 ERR("Failed to create output path");
2739 ret = -1;
2740 goto end;
2741 }
2742
116ffe56 2743 DBG("MKDIR command has path \"%s\", changed to \"%s\"", path_view.data, path);
a1ae2ea5
JD		 2744 ret = utils_mkdir_recursive(path, S_IRWXU | S_IRWXG, -1, -1);
2745 if (ret < 0) {
2746 ERR("relay creating output directory");
2747 goto end;
2748 }
2749
2750 ret = 0;
2751
2752end:
2753 memset(&reply, 0, sizeof(reply));
2754 if (ret < 0) {
2755 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2756 } else {
2757 reply.ret_code = htobe32(LTTNG_OK);
2758 }
5312a3ed
JG		 2759 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2760 if (send_ret < (ssize_t) sizeof(reply)) {
2761 ERR("Failed to send \"mkdir\" command reply (ret = %zd)", send_ret);
a1ae2ea5
JD		 2762 ret = -1;
2763 }
2764
2765end_no_session:
2766 free(path);
a1ae2ea5
JD		 2767 return ret;
2768}
2769
00fb02ac
JD		 2770static int validate_rotate_rename_path_length(const char *path_type,
2771 uint32_t path_length)
2772{
2773 int ret = 0;
2774
2775 if (path_length > LTTNG_PATH_MAX) {
2776 ret = -ENAMETOOLONG;
2777 ERR("rotate rename \"%s\" path name length (%" PRIu32 " bytes) exceeds the allowed size of %i bytes",
2778 path_type, path_length, LTTNG_PATH_MAX);
2779 } else if (path_length == 0) {
2780 ret = -EINVAL;
2781 ERR("rotate rename \"%s\" path name has an illegal length of 0", path_type);
2782 }
2783 return ret;
2784}
2785
2786/*
2787 * relay_rotate_rename: rename the trace folder after a rotation is
2788 * completed. We are not closing any fd here, just moving the folder, so it
2789 * works even if data is still in-flight.
2790 */
5312a3ed
JG		 2791static int relay_rotate_rename(const struct lttcomm_relayd_hdr *recv_hdr,
2792 struct relay_connection *conn,
2793 const struct lttng_buffer_view *payload)
00fb02ac
JD		 2794{
2795 int ret;
5312a3ed 2796 ssize_t send_ret;
00fb02ac
JD		 2797 struct relay_session *session = conn->session;
2798 struct lttcomm_relayd_generic_reply reply;
2799 struct lttcomm_relayd_rotate_rename header;
5312a3ed 2800 size_t header_len;
00fb02ac 2801 size_t received_paths_size;
00fb02ac 2802 char *complete_old_path = NULL, *complete_new_path = NULL;
5312a3ed
JG		 2803 struct lttng_buffer_view old_path_view;
2804 struct lttng_buffer_view new_path_view;
00fb02ac
JD		 2805
2806 if (!session || !conn->version_check_done) {
2807 ERR("Trying to rename a trace folder before version check");
2808 ret = -1;
2809 goto end_no_reply;
2810 }
2811
2812 if (session->major == 2 && session->minor < 11) {
2813 ERR("relay_rotate_rename command is unsupported before LTTng 2.11");
2814 ret = -1;
2815 goto end_no_reply;
2816 }
2817
5312a3ed
JG		 2818 header_len = sizeof(header);
2819 if (payload->size < header_len) {
2820 ERR("Unexpected payload size in \"relay_rotate_rename\": expected >= %zu bytes, got %zu bytes",
2821 header_len, payload->size);
00fb02ac
JD		 2822 ret = -1;
2823 goto end_no_reply;
2824 }
2825
5312a3ed
JG		 2826 memcpy(&header, payload->data, header_len);
2827
00fb02ac
JD		 2828 header.old_path_length = be32toh(header.old_path_length);
2829 header.new_path_length = be32toh(header.new_path_length);
2830 received_paths_size = header.old_path_length + header.new_path_length;
2831
5312a3ed
JG		 2832 if (payload->size < header_len + received_paths_size) {
2833 ERR("Unexpected payload size in \"relay_rotate_rename\" including paths: expected >= %zu bytes, got %zu bytes",
2834 header_len, payload->size);
2835 ret = -1;
2836 goto end_no_reply;
2837 }
2838
00fb02ac
JD		 2839 /* Ensure the paths don't exceed their allowed size. */
2840 ret = validate_rotate_rename_path_length("old", header.old_path_length);
2841 if (ret) {
2842 goto end;
2843 }
2844 ret = validate_rotate_rename_path_length("new", header.new_path_length);
2845 if (ret) {
2846 goto end;
2847 }
2848
5312a3ed
JG		 2849 old_path_view = lttng_buffer_view_from_view(payload, header_len,
2850 header.old_path_length);
2851 new_path_view = lttng_buffer_view_from_view(payload,
2852 header_len + header.old_path_length,
2853 header.new_path_length);
00fb02ac
JD		 2854
2855 /* Validate that both paths received are NULL terminated. */
5312a3ed 2856 if (old_path_view.data[old_path_view.size - 1] != '\0') {
00fb02ac
JD		 2857 ERR("relay_rotate_rename command's \"old\" path is invalid (not NULL terminated)");
2858 ret = -1;
2859 goto end;
2860 }
5312a3ed 2861 if (new_path_view.data[new_path_view.size - 1] != '\0') {
00fb02ac
JD		 2862 ERR("relay_rotate_rename command's \"new\" path is invalid (not NULL terminated)");
2863 ret = -1;
2864 goto end;
2865 }
2866
116ffe56
JG		 2867 DBG("ROTATE_RENAME command has argument old path = \"%s\", new_path = \"%s\"",
2868 old_path_view.data, new_path_view.data);
5312a3ed 2869 complete_old_path = create_output_path(old_path_view.data);
00fb02ac
JD		 2870 if (!complete_old_path) {
2871 ERR("Failed to build old output path in rotate_rename command");
2872 ret = -1;
2873 goto end;
2874 }
2875
5312a3ed 2876 complete_new_path = create_output_path(new_path_view.data);
00fb02ac
JD		 2877 if (!complete_new_path) {
2878 ERR("Failed to build new output path in rotate_rename command");
2879 ret = -1;
2880 goto end;
2881 }
116ffe56
JG		 2882 DBG("Expanded ROTATE_RENAME arguments to old path = \"%s\", new_path = \"%s\"",
2883 complete_old_path, complete_new_path);
00fb02ac
JD		 2884
2885 ret = utils_mkdir_recursive(complete_new_path, S_IRWXU | S_IRWXG,
2886 -1, -1);
2887 if (ret < 0) {
2888 ERR("Failed to mkdir() rotate_rename's \"new\" output directory at \"%s\"",
2889 complete_new_path);
2890 goto end;
2891 }
2892
2893 /*
2894 * If a domain has not yet created its channel, the domain-specific
2895 * folder might not exist, but this is not an error.
2896 */
2897 ret = rename(complete_old_path, complete_new_path);
2898 if (ret < 0 && errno != ENOENT) {
2899 PERROR("Renaming chunk in rotate_rename command from \"%s\" to \"%s\"",
2900 complete_old_path, complete_new_path);
2901 goto end;
2902 }
2903 ret = 0;
2904
2905end:
2906 memset(&reply, 0, sizeof(reply));
2907 if (ret < 0) {
2908 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2909 } else {
2910 reply.ret_code = htobe32(LTTNG_OK);
2911 }
5312a3ed
JG		 2912 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2913 sizeof(reply), 0);
2914 if (send_ret < sizeof(reply)) {
2915 ERR("Failed to send \"rotate rename\" command reply (ret = %zd)",
2916 send_ret);
00fb02ac
JD		 2917 ret = -1;
2918 }
2919
2920end_no_reply:
00fb02ac
JD		 2921 free(complete_old_path);
2922 free(complete_new_path);
2923 return ret;
2924}
2925
e2acc8d2
JD		 2926/*
2927 * Check if all the streams in the session have completed the last rotation.
2928 * The chunk_id value is used to distinguish the cases where a stream was
2929 * closed on the consumerd before the rotation started but it still active on
2930 * the relayd, and the case where a stream appeared on the consumerd/relayd
2931 * after the last rotation started (in that case, it is already writing in the
2932 * new chunk folder).
2933 */
2934static
5312a3ed
JG		 2935int relay_rotate_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2936 struct relay_connection *conn,
2937 const struct lttng_buffer_view *payload)
e2acc8d2
JD		 2938{
2939 struct relay_session *session = conn->session;
2940 struct lttcomm_relayd_rotate_pending msg;
d88744a4 2941 struct lttcomm_relayd_rotate_pending_reply reply;
e2acc8d2
JD		 2942 struct lttng_ht_iter iter;
2943 struct relay_stream *stream;
4f5fb4c3 2944 int ret = 0;
5312a3ed 2945 ssize_t send_ret;
e2acc8d2
JD		 2946 uint64_t chunk_id;
2947 bool rotate_pending = false;
2948
2949 DBG("Rotate pending command received");
2950
2951 if (!session || !conn->version_check_done) {
2952 ERR("Trying to check for data before version check");
2953 ret = -1;
2954 goto end_no_reply;
2955 }
2956
2957 if (session->major == 2 && session->minor < 11) {
2958 ERR("Unsupported feature before 2.11");
2959 ret = -1;
2960 goto end_no_reply;
2961 }
2962
5312a3ed
JG		 2963 if (payload->size < sizeof(msg)) {
2964 ERR("Unexpected payload size in \"relay_rotate_pending\": expected >= %zu bytes, got %zu bytes",
2965 sizeof(msg), payload->size);
e2acc8d2
JD		 2966 ret = -1;
2967 goto end_no_reply;
2968 }
2969
5312a3ed
JG		 2970 memcpy(&msg, payload->data, sizeof(msg));
2971
e2acc8d2 2972 chunk_id = be64toh(msg.chunk_id);
5312a3ed 2973
ce6877c9
JG		 2974 DBG("Evaluating rotate pending for session \"%s\" and chunk id %" PRIu64,
2975 session->session_name, chunk_id);
e2acc8d2
JD		 2976
2977 /*
2978 * Iterate over all the streams in the session and check if they are
2979 * still waiting for data to perform their rotation.
2980 */
2981 rcu_read_lock();
2982 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2983 node.node) {
2984 if (!stream_get(stream)) {
2985 continue;
2986 }
2987 if (stream->trace->session != session) {
2988 stream_put(stream);
2989 continue;
2990 }
2991 pthread_mutex_lock(&stream->lock);
2992 if (stream->rotate_at_seq_num != -1ULL) {
2993 /* We have not yet performed the rotation. */
2994 rotate_pending = true;
2995 DBG("Stream %" PRIu64 " is still rotating",
2996 stream->stream_handle);
2280aad1 2997 } else if (stream->current_chunk_id.value <= chunk_id) {
e2acc8d2
JD		 2998 /*
2999 * Stream closed on the consumer but still active on the
3000 * relay.
3001 */
3002 rotate_pending = true;
3003 DBG("Stream %" PRIu64 " did not exist on the consumer "
3004 "when the last rotation started, but is"
3005 "still waiting for data before getting"
3006 "closed",
3007 stream->stream_handle);
3008 }
3009 pthread_mutex_unlock(&stream->lock);
3010 stream_put(stream);
3011 if (rotate_pending) {
3012 goto send_reply;
3013 }
3014 }
3015
3016send_reply:
3017 rcu_read_unlock();
3018 memset(&reply, 0, sizeof(reply));
d88744a4
JD		 3019 reply.generic.ret_code = htobe32((uint32_t) LTTNG_OK);
3020 reply.is_pending = (uint8_t) !!rotate_pending;
5312a3ed 3021 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
e2acc8d2 3022 sizeof(reply), 0);
5312a3ed
JG		 3023 if (send_ret < (ssize_t) sizeof(reply)) {
3024 ERR("Failed to send \"rotate pending\" command reply (ret = %zd)",
3025 send_ret);
e2acc8d2
JD		 3026 ret = -1;
3027 }
3028
3029end_no_reply:
3030 return ret;
3031}
3032
5312a3ed
JG		 3033#define DBG_CMD(cmd_name, conn) \
3034 DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
3035
3036static int relay_process_control_command(struct relay_connection *conn,
3037 const struct lttcomm_relayd_hdr *header,
3038 const struct lttng_buffer_view *payload)
b8aa1682
JD		 3039{
3040 int ret = 0;
3041
5312a3ed 3042 switch (header->cmd) {
b8aa1682 3043 case RELAYD_CREATE_SESSION:
5312a3ed
JG		 3044 DBG_CMD("RELAYD_CREATE_SESSION", conn);
3045 ret = relay_create_session(header, conn, payload);
b8aa1682 3046 break;
b8aa1682 3047 case RELAYD_ADD_STREAM:
5312a3ed
JG		 3048 DBG_CMD("RELAYD_ADD_STREAM", conn);
3049 ret = relay_add_stream(header, conn, payload);
b8aa1682
JD		 3050 break;
3051 case RELAYD_START_DATA:
5312a3ed
JG		 3052 DBG_CMD("RELAYD_START_DATA", conn);
3053 ret = relay_start(header, conn, payload);
b8aa1682
JD		 3054 break;
3055 case RELAYD_SEND_METADATA:
5312a3ed
JG		 3056 DBG_CMD("RELAYD_SEND_METADATA", conn);
3057 ret = relay_recv_metadata(header, conn, payload);
b8aa1682
JD		 3058 break;
3059 case RELAYD_VERSION:
5312a3ed
JG		 3060 DBG_CMD("RELAYD_VERSION", conn);
3061 ret = relay_send_version(header, conn, payload);
b8aa1682 3062 break;
173af62f 3063 case RELAYD_CLOSE_STREAM:
5312a3ed
JG		 3064 DBG_CMD("RELAYD_CLOSE_STREAM", conn);
3065 ret = relay_close_stream(header, conn, payload);
173af62f 3066 break;
6d805429 3067 case RELAYD_DATA_PENDING:
5312a3ed
JG		 3068 DBG_CMD("RELAYD_DATA_PENDING", conn);
3069 ret = relay_data_pending(header, conn, payload);
c8f59ee5
DG		 3070 break;
3071 case RELAYD_QUIESCENT_CONTROL:
5312a3ed
JG		 3072 DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
3073 ret = relay_quiescent_control(header, conn, payload);
c8f59ee5 3074 break;
f7079f67 3075 case RELAYD_BEGIN_DATA_PENDING:
5312a3ed
JG		 3076 DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
3077 ret = relay_begin_data_pending(header, conn, payload);
f7079f67
DG		 3078 break;
3079 case RELAYD_END_DATA_PENDING:
5312a3ed
JG		 3080 DBG_CMD("RELAYD_END_DATA_PENDING", conn);
3081 ret = relay_end_data_pending(header, conn, payload);
f7079f67 3082 break;
1c20f0e2 3083 case RELAYD_SEND_INDEX:
5312a3ed
JG		 3084 DBG_CMD("RELAYD_SEND_INDEX", conn);
3085 ret = relay_recv_index(header, conn, payload);
1c20f0e2 3086 break;
a4baae1b 3087 case RELAYD_STREAMS_SENT:
5312a3ed
JG		 3088 DBG_CMD("RELAYD_STREAMS_SENT", conn);
3089 ret = relay_streams_sent(header, conn, payload);
a4baae1b 3090 break;
93ec662e 3091 case RELAYD_RESET_METADATA:
5312a3ed
JG		 3092 DBG_CMD("RELAYD_RESET_METADATA", conn);
3093 ret = relay_reset_metadata(header, conn, payload);
93ec662e 3094 break;
d3ecc550 3095 case RELAYD_ROTATE_STREAM:
5312a3ed
JG		 3096 DBG_CMD("RELAYD_ROTATE_STREAM", conn);
3097 ret = relay_rotate_session_stream(header, conn, payload);
d3ecc550 3098 break;
00fb02ac 3099 case RELAYD_ROTATE_RENAME:
5312a3ed
JG		 3100 DBG_CMD("RELAYD_ROTATE_RENAME", conn);
3101 ret = relay_rotate_rename(header, conn, payload);
00fb02ac 3102 break;
e2acc8d2 3103 case RELAYD_ROTATE_PENDING:
5312a3ed
JG		 3104 DBG_CMD("RELAYD_ROTATE_PENDING", conn);
3105 ret = relay_rotate_pending(header, conn, payload);
e2acc8d2 3106 break;
a1ae2ea5 3107 case RELAYD_MKDIR:
5312a3ed
JG		 3108 DBG_CMD("RELAYD_MKDIR", conn);
3109 ret = relay_mkdir(header, conn, payload);
a1ae2ea5 3110 break;
b8aa1682
JD		 3111 case RELAYD_UPDATE_SYNC_INFO:
3112 default:
5312a3ed 3113 ERR("Received unknown command (%u)", header->cmd);
58eb9381 3114 relay_unknown_command(conn);
b8aa1682
JD		 3115 ret = -1;
3116 goto end;
3117 }
3118
3119end:
3120 return ret;
3121}
3122
5569b118
JG		 3123static enum relay_connection_status relay_process_control_receive_payload(
3124 struct relay_connection *conn)
5312a3ed
JG		 3125{
3126 int ret = 0;
5569b118 3127 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 3128 struct lttng_dynamic_buffer *reception_buffer =
3129 &conn->protocol.ctrl.reception_buffer;
3130 struct ctrl_connection_state_receive_payload *state =
3131 &conn->protocol.ctrl.state.receive_payload;
3132 struct lttng_buffer_view payload_view;
3133
3134 if (state->left_to_receive == 0) {
3135 /* Short-circuit for payload-less commands. */
3136 goto reception_complete;
3137 }
3138
3139 ret = conn->sock->ops->recvmsg(conn->sock,
3140 reception_buffer->data + state->received,
3141 state->left_to_receive, MSG_DONTWAIT);
3142 if (ret < 0) {
5569b118
JG		 3143 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3144 PERROR("Unable to receive command payload on sock %d",
3145 conn->sock->fd);
3146 status = RELAY_CONNECTION_STATUS_ERROR;
3147 }
5312a3ed
JG		 3148 goto end;
3149 } else if (ret == 0) {
3150 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3151 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG		 3152 goto end;
3153 }
3154
3155 assert(ret > 0);
3156 assert(ret <= state->left_to_receive);
3157
3158 state->left_to_receive -= ret;
3159 state->received += ret;
3160
3161 if (state->left_to_receive > 0) {
3162 /*
3163 * Can't transition to the protocol's next state, wait to
3164 * receive the rest of the header.
3165 */
3166 DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3167 state->received, state->left_to_receive,
3168 conn->sock->fd);
5312a3ed
JG		 3169 goto end;
3170 }
3171
3172reception_complete:
3173 DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
3174 conn->sock->fd, state->received);
3175 /*
3176 * The payload required to process the command has been received.
3177 * A view to the reception buffer is forwarded to the various
3178 * commands and the state of the control is reset on success.
3179 *
3180 * Commands are responsible for sending their reply to the peer.
3181 */
3182 payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
3183 0, -1);
3184 ret = relay_process_control_command(conn,
3185 &state->header, &payload_view);
3186 if (ret < 0) {
5569b118 3187 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3188 goto end;
3189 }
3190
3191 ret = connection_reset_protocol_state(conn);
5569b118
JG		 3192 if (ret) {
3193 status = RELAY_CONNECTION_STATUS_ERROR;
3194 }
5312a3ed 3195end:
5569b118 3196 return status;
5312a3ed
JG		 3197}
3198
5569b118
JG		 3199static enum relay_connection_status relay_process_control_receive_header(
3200 struct relay_connection *conn)
5312a3ed
JG		 3201{
3202 int ret = 0;
5569b118 3203 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 3204 struct lttcomm_relayd_hdr header;
3205 struct lttng_dynamic_buffer *reception_buffer =
3206 &conn->protocol.ctrl.reception_buffer;
3207 struct ctrl_connection_state_receive_header *state =
3208 &conn->protocol.ctrl.state.receive_header;
3209
3210 assert(state->left_to_receive != 0);
3211
3212 ret = conn->sock->ops->recvmsg(conn->sock,
3213 reception_buffer->data + state->received,
3214 state->left_to_receive, MSG_DONTWAIT);
3215 if (ret < 0) {
5569b118
JG		 3216 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3217 PERROR("Unable to receive control command header on sock %d",
3218 conn->sock->fd);
3219 status = RELAY_CONNECTION_STATUS_ERROR;
3220 }
5312a3ed
JG		 3221 goto end;
3222 } else if (ret == 0) {
3223 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3224 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG		 3225 goto end;
3226 }
3227
3228 assert(ret > 0);
3229 assert(ret <= state->left_to_receive);
3230
3231 state->left_to_receive -= ret;
3232 state->received += ret;
3233
3234 if (state->left_to_receive > 0) {
3235 /*
3236 * Can't transition to the protocol's next state, wait to
3237 * receive the rest of the header.
3238 */
3239 DBG3("Partial reception of control connection protocol header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3240 state->received, state->left_to_receive,
3241 conn->sock->fd);
5312a3ed
JG		 3242 goto end;
3243 }
3244
3245 /* Transition to next state: receiving the command's payload. */
3246 conn->protocol.ctrl.state_id =
3247 CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD;
3248 memcpy(&header, reception_buffer->data, sizeof(header));
3249 header.circuit_id = be64toh(header.circuit_id);
3250 header.data_size = be64toh(header.data_size);
3251 header.cmd = be32toh(header.cmd);
3252 header.cmd_version = be32toh(header.cmd_version);
3253 memcpy(&conn->protocol.ctrl.state.receive_payload.header,
3254 &header, sizeof(header));
3255
3256 DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32 ", cmd_version = %" PRIu32 ", payload size = %" PRIu64 " bytes",
3257 conn->sock->fd, header.cmd, header.cmd_version,
3258 header.data_size);
3259
715e6fb1 3260 if (header.data_size > DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE) {
5312a3ed
JG		 3261 ERR("Command header indicates a payload (%" PRIu64 " bytes) that exceeds the maximal payload size allowed on a control connection.",
3262 header.data_size);
5569b118 3263 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3264 goto end;
3265 }
3266
3267 conn->protocol.ctrl.state.receive_payload.left_to_receive =
3268 header.data_size;
3269 conn->protocol.ctrl.state.receive_payload.received = 0;
3270 ret = lttng_dynamic_buffer_set_size(reception_buffer,
3271 header.data_size);
3272 if (ret) {
5569b118 3273 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3274 goto end;
3275 }
3276
3277 if (header.data_size == 0) {
3278 /*
3279 * Manually invoke the next state as the poll loop
3280 * will not wake-up to allow us to proceed further.
3281 */
5569b118 3282 status = relay_process_control_receive_payload(conn);
5312a3ed
JG		 3283 }
3284end:
5569b118 3285 return status;
5312a3ed
JG		 3286}
3287
3288/*
3289 * Process the commands received on the control socket
3290 */
5569b118
JG		 3291static enum relay_connection_status relay_process_control(
3292 struct relay_connection *conn)
5312a3ed 3293{
5569b118 3294 enum relay_connection_status status;
5312a3ed
JG		 3295
3296 switch (conn->protocol.ctrl.state_id) {
3297 case CTRL_CONNECTION_STATE_RECEIVE_HEADER:
5569b118 3298 status = relay_process_control_receive_header(conn);
5312a3ed
JG		 3299 break;
3300 case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD:
5569b118 3301 status = relay_process_control_receive_payload(conn);
5312a3ed
JG		 3302 break;
3303 default:
3304 ERR("Unknown control connection protocol state encountered.");
3305 abort();
3306 }
3307
5569b118 3308 return status;
5312a3ed
JG		 3309}
3310
7d2f7452
DG		 3311/*
3312 * Handle index for a data stream.
3313 *
7591bab1 3314 * Called with the stream lock held.
7d2f7452
DG		 3315 *
3316 * Return 0 on success else a negative value.
3317 */
3318static int handle_index_data(struct relay_stream *stream, uint64_t net_seq_num,
5312a3ed 3319 bool rotate_index, bool *flushed, uint64_t total_size)
7d2f7452 3320{
7591bab1
MD		 3321 int ret = 0;
3322 uint64_t data_offset;
3323 struct relay_index *index;
7d2f7452 3324
7d2f7452
DG		 3325 /* Get data offset because we are about to update the index. */
3326 data_offset = htobe64(stream->tracefile_size_current);
3327
65d66b19
MD		 3328 DBG("handle_index_data: stream %" PRIu64 " net_seq_num %" PRIu64 " data offset %" PRIu64,
3329 stream->stream_handle, net_seq_num, stream->tracefile_size_current);
7591bab1 3330
7d2f7452 3331 /*
7591bab1
MD		 3332 * Lookup for an existing index for that stream id/sequence
3333 * number. If it exists, the control thread has already received the
3334 * data for it, thus we need to write it to disk.
7d2f7452 3335 */
7591bab1 3336 index = relay_index_get_by_id_or_create(stream, net_seq_num);
7d2f7452 3337 if (!index) {
7591bab1
MD		 3338 ret = -1;
3339 goto end;
7d2f7452
DG		 3340 }
3341
f8f3885c 3342 if (rotate_index || !stream->index_file) {
cb523e02
JG		 3343 const char *stream_path;
3344
3345 /*
3346 * The data connection creates the stream's first index file.
3347 *
3348 * This can happen _after_ a ROTATE_STREAM command. In
3349 * other words, the data of the first packet of this stream
3350 * can be received after a ROTATE_STREAM command.
3351 *
3352 * The ROTATE_STREAM command changes the stream's path_name
3353 * to point to the "next" chunk. If a rotation is pending for
3354 * this stream, as indicated by "rotate_at_seq_num != -1ULL",
3355 * it means that we are still receiving data that belongs in the
3356 * stream's former path.
3357 *
3358 * In this very specific case, we must ensure that the index
3359 * file is created in the streams's former path,
3360 * "prev_path_name".
3361 *
3362 * All other rotations beyond the first one are not affected
3363 * by this problem since the actual rotation operation creates
3364 * the new chunk's index file.
3365 */
3366 stream_path = stream->rotate_at_seq_num == -1ULL ?
3367 stream->path_name:
3368 stream->prev_path_name;
3369
3370 ret = create_rotate_index_file(stream, stream_path);
d3ecc550
JD		 3371 if (ret < 0) {
3372 ERR("Failed to rotate index");
7591bab1
MD		 3373 /* Put self-ref for this index due to error. */
3374 relay_index_put(index);
f8f3885c 3375 index = NULL;
7591bab1 3376 goto end;
7d2f7452 3377 }
7d2f7452
DG		 3378 }
3379
f8f3885c 3380 if (relay_index_set_file(index, stream->index_file, data_offset)) {
7591bab1
MD		 3381 ret = -1;
3382 /* Put self-ref for this index due to error. */
3383 relay_index_put(index);
f8f3885c 3384 index = NULL;
7591bab1 3385 goto end;
7d2f7452
DG		 3386 }
3387
7591bab1
MD		 3388 ret = relay_index_try_flush(index);
3389 if (ret == 0) {
a44ca2ca
MD		 3390 tracefile_array_commit_seq(stream->tfa);
3391 stream->index_received_seqcount++;
d3ecc550 3392 *flushed = true;
7591bab1 3393 } else if (ret > 0) {
d3ecc550 3394 index->total_size = total_size;
7591bab1
MD		 3395 /* No flush. */
3396 ret = 0;
3397 } else {
245f8bec
JR		 3398 /*
3399 * ret < 0
3400 *
3401 * relay_index_try_flush is responsible for the self-reference
3402 * put of the index object on error.
3403 */
3404 ERR("relay_index_try_flush error %d", ret);
7591bab1
MD		 3405 ret = -1;
3406 }
3407end:
7d2f7452
DG		 3408 return ret;
3409}
3410
5569b118
JG		 3411static enum relay_connection_status relay_process_data_receive_header(
3412 struct relay_connection *conn)
b8aa1682 3413{
5312a3ed 3414 int ret;
5569b118 3415 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 3416 struct data_connection_state_receive_header *state =
3417 &conn->protocol.data.state.receive_header;
3418 struct lttcomm_relayd_data_hdr header;
b8aa1682 3419 struct relay_stream *stream;
5312a3ed
JG		 3420
3421 assert(state->left_to_receive != 0);
3422
3423 ret = conn->sock->ops->recvmsg(conn->sock,
3424 state->header_reception_buffer + state->received,
3425 state->left_to_receive, MSG_DONTWAIT);
3426 if (ret < 0) {
5569b118
JG		 3427 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3428 PERROR("Unable to receive data header on sock %d", conn->sock->fd);
3429 status = RELAY_CONNECTION_STATUS_ERROR;
3430 }
5312a3ed
JG		 3431 goto end;
3432 } else if (ret == 0) {
3433 /* Orderly shutdown. Not necessary to print an error. */
3434 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3435 status = RELAY_CONNECTION_STATUS_CLOSED;
b8aa1682
JD		 3436 goto end;
3437 }
3438
5312a3ed
JG		 3439 assert(ret > 0);
3440 assert(ret <= state->left_to_receive);
3441
3442 state->left_to_receive -= ret;
3443 state->received += ret;
3444
3445 if (state->left_to_receive > 0) {
3446 /*
3447 * Can't transition to the protocol's next state, wait to
3448 * receive the rest of the header.
3449 */
3450 DBG3("Partial reception of data connection header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3451 state->received, state->left_to_receive,
3452 conn->sock->fd);
7591bab1 3453 goto end;
b8aa1682 3454 }
b8aa1682 3455
5312a3ed
JG		 3456 /* Transition to next state: receiving the payload. */
3457 conn->protocol.data.state_id = DATA_CONNECTION_STATE_RECEIVE_PAYLOAD;
173af62f 3458
5312a3ed
JG		 3459 memcpy(&header, state->header_reception_buffer, sizeof(header));
3460 header.circuit_id = be64toh(header.circuit_id);
3461 header.stream_id = be64toh(header.stream_id);
3462 header.data_size = be32toh(header.data_size);
3463 header.net_seq_num = be64toh(header.net_seq_num);
3464 header.padding_size = be32toh(header.padding_size);
3465 memcpy(&conn->protocol.data.state.receive_payload.header, &header, sizeof(header));
3466
3467 conn->protocol.data.state.receive_payload.left_to_receive =
3468 header.data_size;
3469 conn->protocol.data.state.receive_payload.received = 0;
3470 conn->protocol.data.state.receive_payload.rotate_index = false;
3471
3472 DBG("Received data connection header on fd %i: circuit_id = %" PRIu64 ", stream_id = %" PRIu64 ", data_size = %" PRIu32 ", net_seq_num = %" PRIu64 ", padding_size = %" PRIu32,
3473 conn->sock->fd, header.circuit_id,
3474 header.stream_id, header.data_size,
3475 header.net_seq_num, header.padding_size);
3476
3477 stream = stream_get_by_id(header.stream_id);
3478 if (!stream) {
3479 DBG("relay_process_data_receive_payload: Cannot find stream %" PRIu64,
3480 header.stream_id);
5569b118
JG		 3481 /* Protocol error. */
3482 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3483 goto end;
3484 }
b8aa1682 3485
7591bab1
MD		 3486 pthread_mutex_lock(&stream->lock);
3487
1c20f0e2 3488 /* Check if a rotation is needed. */
0f907de1 3489 if (stream->tracefile_size > 0 &&
5312a3ed 3490 (stream->tracefile_size_current + header.data_size) >
0f907de1 3491 stream->tracefile_size) {
a44ca2ca
MD		 3492 uint64_t old_id, new_id;
3493
3494 old_id = tracefile_array_get_file_index_head(stream->tfa);
3495 tracefile_array_file_rotate(stream->tfa);
3496
3497 /* new_id is updated by utils_rotate_stream_file. */
3498 new_id = old_id;
6b6b9a5a 3499
7591bab1
MD		 3500 ret = utils_rotate_stream_file(stream->path_name,
3501 stream->channel_name, stream->tracefile_size,
3502 stream->tracefile_count, -1,
3503 -1, stream->stream_fd->fd,
a44ca2ca 3504 &new_id, &stream->stream_fd->fd);
0f907de1 3505 if (ret < 0) {
5312a3ed 3506 ERR("Failed to rotate stream output file");
5569b118 3507 status = RELAY_CONNECTION_STATUS_ERROR;
7591bab1
MD		 3508 goto end_stream_unlock;
3509 }
5312a3ed 3510
7591bab1
MD		 3511 /*
3512 * Reset current size because we just performed a stream
3513 * rotation.
3514 */
a6976990 3515 stream->tracefile_size_current = 0;
5312a3ed 3516 conn->protocol.data.state.receive_payload.rotate_index = true;
1c20f0e2
JD		 3517 }
3518
5312a3ed
JG		 3519end_stream_unlock:
3520 pthread_mutex_unlock(&stream->lock);
3521 stream_put(stream);
3522end:
5569b118 3523 return status;
5312a3ed
JG		 3524}
3525
5569b118
JG		 3526static enum relay_connection_status relay_process_data_receive_payload(
3527 struct relay_connection *conn)
5312a3ed
JG		 3528{
3529 int ret;
5569b118 3530 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 3531 struct relay_stream *stream;
3532 struct data_connection_state_receive_payload *state =
3533 &conn->protocol.data.state.receive_payload;
3534 const size_t chunk_size = RECV_DATA_BUFFER_SIZE;
3535 char data_buffer[chunk_size];
3536 bool partial_recv = false;
3537 bool new_stream = false, close_requested = false, index_flushed = false;
3538 uint64_t left_to_receive = state->left_to_receive;
3539 struct relay_session *session;
3540
fd0f1e3e
JR		 3541 DBG3("Receiving data for stream id %" PRIu64 " seqnum %" PRIu64 ", %" PRIu64" bytes received, %" PRIu64 " bytes left to receive",
3542 state->header.stream_id, state->header.net_seq_num,
3543 state->received, left_to_receive);
3544
5312a3ed
JG		 3545 stream = stream_get_by_id(state->header.stream_id);
3546 if (!stream) {
5569b118 3547 /* Protocol error. */
fd0f1e3e 3548 ERR("relay_process_data_receive_payload: cannot find stream %" PRIu64,
5312a3ed 3549 state->header.stream_id);
5569b118 3550 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed 3551 goto end;
1c20f0e2
JD		 3552 }
3553
5312a3ed
JG		 3554 pthread_mutex_lock(&stream->lock);
3555 session = stream->trace->session;
fd0f1e3e
JR		 3556 if (!conn->session) {
3557 ret = connection_set_session(conn, session);
3558 if (ret) {
3559 status = RELAY_CONNECTION_STATUS_ERROR;
3560 goto end_stream_unlock;
3561 }
3562 }
5312a3ed
JG		 3563
3564 /*
3565 * The size of the "chunk" received on any iteration is bounded by:
3566 * - the data left to receive,
3567 * - the data immediately available on the socket,
3568 * - the on-stack data buffer
3569 */
3570 while (left_to_receive > 0 && !partial_recv) {
3571 ssize_t write_ret;
3572 size_t recv_size = min(left_to_receive, chunk_size);
3573
3574 ret = conn->sock->ops->recvmsg(conn->sock, data_buffer,
3575 recv_size, MSG_DONTWAIT);
3576 if (ret < 0) {
5569b118
JG		 3577 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3578 PERROR("Socket %d error", conn->sock->fd);
3579 status = RELAY_CONNECTION_STATUS_ERROR;
3580 }
0848dba7 3581 goto end_stream_unlock;
5312a3ed
JG		 3582 } else if (ret == 0) {
3583 /* No more data ready to be consumed on socket. */
3584 DBG3("No more data ready for consumption on data socket of stream id %" PRIu64,
3585 state->header.stream_id);
5569b118 3586 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG		 3587 break;
3588 } else if (ret < (int) recv_size) {
3589 /*
3590 * All the data available on the socket has been
3591 * consumed.
3592 */
3593 partial_recv = true;
0848dba7
MD		 3594 }
3595
5312a3ed
JG		 3596 recv_size = ret;
3597
0848dba7 3598 /* Write data to stream output fd. */
5312a3ed 3599 write_ret = lttng_write(stream->stream_fd->fd, data_buffer,
0848dba7 3600 recv_size);
5312a3ed 3601 if (write_ret < (ssize_t) recv_size) {
0848dba7 3602 ERR("Relay error writing data to file");
5569b118 3603 status = RELAY_CONNECTION_STATUS_ERROR;
0848dba7
MD		 3604 goto end_stream_unlock;
3605 }
3606
5312a3ed
JG		 3607 left_to_receive -= recv_size;
3608 state->received += recv_size;
3609 state->left_to_receive = left_to_receive;
3610
0848dba7 3611 DBG2("Relay wrote %zd bytes to tracefile for stream id %" PRIu64,
5312a3ed
JG		 3612 write_ret, stream->stream_handle);
3613 }
3614
3615 if (state->left_to_receive > 0) {
3616 /*
3617 * Did not receive all the data expected, wait for more data to
3618 * become available on the socket.
3619 */
3620 DBG3("Partial receive on data connection of stream id %" PRIu64 ", %" PRIu64 " bytes received, %" PRIu64 " bytes left to receive",
3621 state->header.stream_id, state->received,
3622 state->left_to_receive);
5312a3ed 3623 goto end_stream_unlock;
0848dba7 3624 }
5ab7344e 3625
7591bab1 3626 ret = write_padding_to_file(stream->stream_fd->fd,
5312a3ed 3627 state->header.padding_size);
46f4eaa5 3628 if ((int64_t) ret < (int64_t) state->header.padding_size) {
65d66b19 3629 ERR("write_padding_to_file: fail stream %" PRIu64 " net_seq_num %" PRIu64 " ret %d",
5312a3ed
JG		 3630 stream->stream_handle,
3631 state->header.net_seq_num, ret);
5569b118 3632 status = RELAY_CONNECTION_STATUS_ERROR;
7591bab1 3633 goto end_stream_unlock;
1d4dfdef 3634 }
5312a3ed
JG		 3635
3636
298a25ca 3637 if (session_streams_have_index(session)) {
5312a3ed
JG		 3638 ret = handle_index_data(stream, state->header.net_seq_num,
3639 state->rotate_index, &index_flushed, state->header.data_size + state->header.padding_size);
3640 if (ret < 0) {
3641 ERR("handle_index_data: fail stream %" PRIu64 " net_seq_num %" PRIu64 " ret %d",
3642 stream->stream_handle,
3643 state->header.net_seq_num, ret);
5569b118 3644 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3645 goto end_stream_unlock;
3646 }
3647 }
3648
3649 stream->tracefile_size_current += state->header.data_size +
3650 state->header.padding_size;
3651
a8f9f353 3652 if (stream->prev_data_seq == -1ULL) {
c0bae11d
MD		 3653 new_stream = true;
3654 }
d3ecc550
JD		 3655 if (index_flushed) {
3656 stream->pos_after_last_complete_data_index =
3657 stream->tracefile_size_current;
7a45c7e6 3658 stream->prev_index_seq = state->header.net_seq_num;
c6db3843
JG		 3659 ret = try_rotate_stream_index(stream);
3660 if (ret < 0) {
3661 goto end_stream_unlock;
3662 }
d3ecc550 3663 }
c0bae11d 3664
a8f9f353 3665 stream->prev_data_seq = state->header.net_seq_num;
5312a3ed
JG		 3666
3667 /*
3668 * Resetting the protocol state (to RECEIVE_HEADER) will trash the
3669 * contents of *state which are aliased (union) to the same location as
3670 * the new state. Don't use it beyond this point.
3671 */
3672 connection_reset_protocol_state(conn);
3673 state = NULL;
173af62f 3674
c6db3843 3675 ret = try_rotate_stream_data(stream);
d3ecc550 3676 if (ret < 0) {
5569b118 3677 status = RELAY_CONNECTION_STATUS_ERROR;
d3ecc550
JD		 3678 goto end_stream_unlock;
3679 }
3680
7591bab1 3681end_stream_unlock:
bda7c7b9 3682 close_requested = stream->close_requested;
7591bab1 3683 pthread_mutex_unlock(&stream->lock);
5312a3ed 3684 if (close_requested && left_to_receive == 0) {
bda7c7b9
JG		 3685 try_stream_close(stream);
3686 }
3687
c0bae11d
MD		 3688 if (new_stream) {
3689 pthread_mutex_lock(&session->lock);
3690 uatomic_set(&session->new_streams, 1);
3691 pthread_mutex_unlock(&session->lock);
3692 }
5312a3ed 3693
7591bab1 3694 stream_put(stream);
b8aa1682 3695end:
5569b118 3696 return status;
b8aa1682
JD		 3697}
3698
5312a3ed
JG		 3699/*
3700 * relay_process_data: Process the data received on the data socket
3701 */
5569b118
JG		 3702static enum relay_connection_status relay_process_data(
3703 struct relay_connection *conn)
5312a3ed 3704{
5569b118 3705 enum relay_connection_status status;
5312a3ed
JG		 3706
3707 switch (conn->protocol.data.state_id) {
3708 case DATA_CONNECTION_STATE_RECEIVE_HEADER:
5569b118 3709 status = relay_process_data_receive_header(conn);
5312a3ed
JG		 3710 break;
3711 case DATA_CONNECTION_STATE_RECEIVE_PAYLOAD:
5569b118 3712 status = relay_process_data_receive_payload(conn);
5312a3ed
JG		 3713 break;
3714 default:
3715 ERR("Unexpected data connection communication state.");
3716 abort();
3717 }
3718
5569b118 3719 return status;
5312a3ed
JG		 3720}
3721
7591bab1 3722static void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
b8aa1682
JD		 3723{
3724 int ret;
3725
58eb9381 3726 (void) lttng_poll_del(events, pollfd);
b8aa1682
JD		 3727
3728 ret = close(pollfd);
3729 if (ret < 0) {
3730 ERR("Closing pollfd %d", pollfd);
3731 }
3732}
3733
7591bab1
MD		 3734static void relay_thread_close_connection(struct lttng_poll_event *events,
3735 int pollfd, struct relay_connection *conn)
9d1bbf21 3736{
7591bab1 3737 const char *type_str;
2a174661 3738
7591bab1
MD		 3739 switch (conn->type) {
3740 case RELAY_DATA:
3741 type_str = "Data";
3742 break;
3743 case RELAY_CONTROL:
3744 type_str = "Control";
3745 break;
3746 case RELAY_VIEWER_COMMAND:
3747 type_str = "Viewer Command";
3748 break;
3749 case RELAY_VIEWER_NOTIFICATION:
3750 type_str = "Viewer Notification";
3751 break;
3752 default:
3753 type_str = "Unknown";
9d1bbf21 3754 }
7591bab1
MD		 3755 cleanup_connection_pollfd(events, pollfd);
3756 connection_put(conn);
3757 DBG("%s connection closed with %d", type_str, pollfd);
b8aa1682
JD		 3758}
3759
3760/*
3761 * This thread does the actual work
3762 */
7591bab1 3763static void *relay_thread_worker(void *data)
b8aa1682 3764{
beaad64c
DG		 3765 int ret, err = -1, last_seen_data_fd = -1;
3766 uint32_t nb_fd;
b8aa1682
JD		 3767 struct lttng_poll_event events;
3768 struct lttng_ht *relay_connections_ht;
b8aa1682 3769 struct lttng_ht_iter iter;
90e7d72f 3770 struct relay_connection *destroy_conn = NULL;
b8aa1682
JD		 3771
3772 DBG("[thread] Relay worker started");
3773
9d1bbf21
MD		 3774 rcu_register_thread();
3775
55706a7d
MD		 3776 health_register(health_relayd, HEALTH_RELAYD_TYPE_WORKER);
3777
9b5e0863
MD		 3778 if (testpoint(relayd_thread_worker)) {
3779 goto error_testpoint;
3780 }
3781
f385ae0a
MD		 3782 health_code_update();
3783
b8aa1682
JD		 3784 /* table of connections indexed on socket */
3785 relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
095a4ae5
MD		 3786 if (!relay_connections_ht) {
3787 goto relay_connections_ht_error;
3788 }
b8aa1682 3789
b8aa1682
JD		 3790 ret = create_thread_poll_set(&events, 2);
3791 if (ret < 0) {
3792 goto error_poll_create;
3793 }
3794
58eb9381 3795 ret = lttng_poll_add(&events, relay_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
b8aa1682
JD		 3796 if (ret < 0) {
3797 goto error;
3798 }
3799
beaad64c 3800restart:
b8aa1682 3801 while (1) {
beaad64c
DG		 3802 int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1;
3803
f385ae0a
MD		 3804 health_code_update();
3805
b8aa1682 3806 /* Infinite blocking call, waiting for transmission */
87c1611d 3807 DBG3("Relayd worker thread polling...");
f385ae0a 3808 health_poll_entry();
b8aa1682 3809 ret = lttng_poll_wait(&events, -1);
f385ae0a 3810 health_poll_exit();
b8aa1682
JD		 3811 if (ret < 0) {
3812 /*
3813 * Restart interrupted system call.
3814 */
3815 if (errno == EINTR) {
3816 goto restart;
3817 }
3818 goto error;
3819 }
3820
0d9c5d77
DG		 3821 nb_fd = ret;
3822
beaad64c 3823 /*
7591bab1
MD		 3824 * Process control. The control connection is
3825 * prioritized so we don't starve it with high
3826 * throughput tracing data on the data connection.
beaad64c 3827 */
b8aa1682
JD		 3828 for (i = 0; i < nb_fd; i++) {
3829 /* Fetch once the poll data */
beaad64c
DG		 3830 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
3831 int pollfd = LTTNG_POLL_GETFD(&events, i);
b8aa1682 3832
f385ae0a
MD		 3833 health_code_update();
3834
fd20dac9 3835 if (!revents) {
7591bab1
MD		 3836 /*
3837 * No activity for this FD (poll
3838 * implementation).
3839 */
fd20dac9
MD		 3840 continue;
3841 }
3842
b8aa1682
JD		 3843 /* Thread quit pipe has been closed. Killing thread. */
3844 ret = check_thread_quit_pipe(pollfd, revents);
3845 if (ret) {
095a4ae5
MD		 3846 err = 0;
3847 goto exit;
b8aa1682
JD		 3848 }
3849
58eb9381
DG		 3850 /* Inspect the relay conn pipe for new connection */
3851 if (pollfd == relay_conn_pipe[0]) {
03e43155 3852 if (revents & LPOLLIN) {
90e7d72f
JG		 3853 struct relay_connection *conn;
3854
58eb9381 3855 ret = lttng_read(relay_conn_pipe[0], &conn, sizeof(conn));
b8aa1682
JD		 3856 if (ret < 0) {
3857 goto error;
3858 }
58eb9381
DG		 3859 lttng_poll_add(&events, conn->sock->fd,
3860 LPOLLIN | LPOLLRDHUP);
7591bab1 3861 connection_ht_add(relay_connections_ht, conn);
58eb9381 3862 DBG("Connection socket %d added", conn->sock->fd);
03e43155
MD		 3863 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3864 ERR("Relay connection pipe error");
3865 goto error;
3866 } else {
3867 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
3868 goto error;
b8aa1682 3869 }
58eb9381 3870 } else {
90e7d72f
JG		 3871 struct relay_connection *ctrl_conn;
3872
7591bab1 3873 ctrl_conn = connection_get_by_sock(relay_connections_ht, pollfd);
58eb9381 3874 /* If not found, there is a synchronization issue. */
90e7d72f 3875 assert(ctrl_conn);
58eb9381 3876
03e43155
MD		 3877 if (ctrl_conn->type == RELAY_DATA) {
3878 if (revents & LPOLLIN) {
beaad64c
DG		 3879 /*
3880 * Flag the last seen data fd not deleted. It will be
3881 * used as the last seen fd if any fd gets deleted in
3882 * this first loop.
3883 */
3884 last_notdel_data_fd = pollfd;
3885 }
03e43155
MD		 3886 goto put_ctrl_connection;
3887 }
3888 assert(ctrl_conn->type == RELAY_CONTROL);
3889
3890 if (revents & LPOLLIN) {
5569b118
JG		 3891 enum relay_connection_status status;
3892
3893 status = relay_process_control(ctrl_conn);
3894 if (status != RELAY_CONNECTION_STATUS_OK) {
fd0f1e3e
JR		 3895 /*
3896 * On socket error flag the session as aborted to force
3897 * the cleanup of its stream otherwise it can leak
3898 * during the lifetime of the relayd.
3899 *
3900 * This prevents situations in which streams can be
3901 * left opened because an index was received, the
3902 * control connection is closed, and the data
3903 * connection is closed (uncleanly) before the packet's
3904 * data provided.
3905 *
3906 * Since the control connection encountered an error,
3907 * it is okay to be conservative and close the
3908 * session right now as we can't rely on the protocol
3909 * being respected anymore.
3910 */
3911 if (status == RELAY_CONNECTION_STATUS_ERROR) {
3912 session_abort(ctrl_conn->session);
3913 }
3914
5569b118 3915 /* Clear the connection on error or close. */
5312a3ed
JG		 3916 relay_thread_close_connection(&events,
3917 pollfd,
03e43155 3918 ctrl_conn);
03e43155 3919 }
5312a3ed 3920 seen_control = 1;
03e43155
MD		 3921 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3922 relay_thread_close_connection(&events,
3923 pollfd, ctrl_conn);
3924 if (last_seen_data_fd == pollfd) {
3925 last_seen_data_fd = last_notdel_data_fd;
3926 }
58eb9381 3927 } else {
03e43155
MD		 3928 ERR("Unexpected poll events %u for control sock %d",
3929 revents, pollfd);
3930 connection_put(ctrl_conn);
3931 goto error;
beaad64c 3932 }
03e43155 3933 put_ctrl_connection:
7591bab1 3934 connection_put(ctrl_conn);
beaad64c
DG		 3935 }
3936 }
3937
3938 /*
3939 * The last loop handled a control request, go back to poll to make
3940 * sure we prioritise the control socket.
3941 */
3942 if (seen_control) {
3943 continue;
3944 }
3945
3946 if (last_seen_data_fd >= 0) {
3947 for (i = 0; i < nb_fd; i++) {
3948 int pollfd = LTTNG_POLL_GETFD(&events, i);
f385ae0a
MD		 3949
3950 health_code_update();
3951
beaad64c
DG		 3952 if (last_seen_data_fd == pollfd) {
3953 idx = i;
3954 break;
3955 }
3956 }
3957 }
3958
3959 /* Process data connection. */
3960 for (i = idx + 1; i < nb_fd; i++) {
3961 /* Fetch the poll data. */
3962 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
3963 int pollfd = LTTNG_POLL_GETFD(&events, i);
90e7d72f 3964 struct relay_connection *data_conn;
beaad64c 3965
f385ae0a
MD		 3966 health_code_update();
3967
fd20dac9
MD		 3968 if (!revents) {
3969 /* No activity for this FD (poll implementation). */
3970 continue;
3971 }
3972
beaad64c 3973 /* Skip the command pipe. It's handled in the first loop. */
58eb9381 3974 if (pollfd == relay_conn_pipe[0]) {
beaad64c
DG		 3975 continue;
3976 }
3977
7591bab1 3978 data_conn = connection_get_by_sock(relay_connections_ht, pollfd);
90e7d72f 3979 if (!data_conn) {
fd20dac9 3980 /* Skip it. Might be removed before. */
fd20dac9
MD		 3981 continue;
3982 }
03e43155
MD		 3983 if (data_conn->type == RELAY_CONTROL) {
3984 goto put_data_connection;
3985 }
3986 assert(data_conn->type == RELAY_DATA);
fd20dac9
MD		 3987
3988 if (revents & LPOLLIN) {
5569b118
JG		 3989 enum relay_connection_status status;
3990
3991 status = relay_process_data(data_conn);
3992 /* Connection closed or error. */
3993 if (status != RELAY_CONNECTION_STATUS_OK) {
fd0f1e3e
JR		 3994 /*
3995 * On socket error flag the session as aborted to force
3996 * the cleanup of its stream otherwise it can leak
3997 * during the lifetime of the relayd.
3998 *
3999 * This prevents situations in which streams can be
4000 * left opened because an index was received, the
4001 * control connection is closed, and the data
4002 * connection is closed (uncleanly) before the packet's
4003 * data provided.
4004 *
4005 * Since the data connection encountered an error,
4006 * it is okay to be conservative and close the
4007 * session right now as we can't rely on the protocol
4008 * being respected anymore.
4009 */
4010 if (status == RELAY_CONNECTION_STATUS_ERROR) {
4011 session_abort(data_conn->session);
4012 }
7591bab1 4013 relay_thread_close_connection(&events, pollfd,
03e43155 4014 data_conn);
fd20dac9
MD		 4015 /*
4016 * Every goto restart call sets the last seen fd where
4017 * here we don't really care since we gracefully
4018 * continue the loop after the connection is deleted.
4019 */
4020 } else {
4021 /* Keep last seen port. */
4022 last_seen_data_fd = pollfd;
7591bab1 4023 connection_put(data_conn);
fd20dac9 4024 goto restart;
b8aa1682 4025 }
03e43155
MD		 4026 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
4027 relay_thread_close_connection(&events, pollfd,
4028 data_conn);
4029 } else {
4030 ERR("Unknown poll events %u for data sock %d",
4031 revents, pollfd);
b8aa1682 4032 }
03e43155 4033 put_data_connection:
7591bab1 4034 connection_put(data_conn);
b8aa1682 4035 }
beaad64c 4036 last_seen_data_fd = -1;
b8aa1682
JD		 4037 }
4038
f385ae0a
MD		 4039 /* Normal exit, no error */
4040 ret = 0;
4041
095a4ae5 4042exit:
b8aa1682 4043error:
71efa8ef 4044 /* Cleanup remaining connection object. */
9d1bbf21 4045 rcu_read_lock();
90e7d72f
JG		 4046 cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter,
4047 destroy_conn,
58eb9381 4048 sock_n.node) {
f385ae0a 4049 health_code_update();
98ba050e 4050
fd0f1e3e 4051 session_abort(destroy_conn->session);
98ba050e 4052
7591bab1
MD		 4053 /*
4054 * No need to grab another ref, because we own
4055 * destroy_conn.
4056 */
4057 relay_thread_close_connection(&events, destroy_conn->sock->fd,
4058 destroy_conn);
b8aa1682 4059 }
94d49140 4060 rcu_read_unlock();
7591bab1
MD		 4061
4062 lttng_poll_clean(&events);
7d2f7452 4063error_poll_create:
b8aa1682 4064 lttng_ht_destroy(relay_connections_ht);
095a4ae5 4065relay_connections_ht_error:
58eb9381
DG		 4066 /* Close relay conn pipes */
4067 utils_close_pipe(relay_conn_pipe);
095a4ae5
MD		 4068 if (err) {
4069 DBG("Thread exited with error");
4070 }
b8aa1682 4071 DBG("Worker thread cleanup complete");
9b5e0863 4072error_testpoint:
f385ae0a
MD		 4073 if (err) {
4074 health_error();
4075 ERR("Health error occurred in %s", __func__);
4076 }
4077 health_unregister(health_relayd);
9d1bbf21 4078 rcu_unregister_thread();
b4aacfdc 4079 lttng_relay_stop_threads();
b8aa1682
JD		 4080 return NULL;
4081}
4082
4083/*
4084 * Create the relay command pipe to wake thread_manage_apps.
4085 * Closed in cleanup().
4086 */
58eb9381 4087static int create_relay_conn_pipe(void)
b8aa1682 4088{
a02de639 4089 int ret;
b8aa1682 4090
58eb9381 4091 ret = utils_create_pipe_cloexec(relay_conn_pipe);
b8aa1682 4092
b8aa1682
JD		 4093 return ret;
4094}
4095
4096/*
4097 * main
4098 */
4099int main(int argc, char **argv)
4100{
178a0557 4101 int ret = 0, retval = 0;
b8aa1682
JD		 4102 void *status;
4103
b8aa1682
JD		 4104 /* Parse arguments */
4105 progname = argv[0];
178a0557
MD		 4106 if (set_options(argc, argv)) {
4107 retval = -1;
4108 goto exit_options;
b8aa1682
JD		 4109 }
4110
178a0557
MD		 4111 if (set_signal_handler()) {
4112 retval = -1;
4113 goto exit_options;
b8aa1682
JD		 4114 }
4115
d817132c
JR		 4116 if (!opt_allow_clear) {
4117 DBG("Clear command disallowed.");
4118 }
4119
4d513a50
DG		 4120 /* Try to create directory if -o, --output is specified. */
4121 if (opt_output_path) {
994fa64f
DG		 4122 if (*opt_output_path != '/') {
4123 ERR("Please specify an absolute path for -o, --output PATH");
178a0557
MD		 4124 retval = -1;
4125 goto exit_options;
994fa64f
DG		 4126 }
4127
d77dded2
JG		 4128 ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG,
4129 -1, -1);
4d513a50
DG		 4130 if (ret < 0) {
4131 ERR("Unable to create %s", opt_output_path);
178a0557
MD		 4132 retval = -1;
4133 goto exit_options;
4d513a50
DG		 4134 }
4135 }
4136
b8aa1682 4137 /* Daemonize */
b5218ffb 4138 if (opt_daemon || opt_background) {
3fd27398
MD		 4139 int i;
4140
4141 ret = lttng_daemonize(&child_ppid, &recv_child_signal,
4142 !opt_background);
b8aa1682 4143 if (ret < 0) {
178a0557
MD		 4144 retval = -1;
4145 goto exit_options;
b8aa1682 4146 }
3fd27398
MD		 4147
4148 /*
4149 * We are in the child. Make sure all other file
4150 * descriptors are closed, in case we are called with
4151 * more opened file descriptors than the standard ones.
4152 */
4153 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
4154 (void) close(i);
4155 }
4156 }
4157
178a0557
MD		 4158 /* Initialize thread health monitoring */
4159 health_relayd = health_app_create(NR_HEALTH_RELAYD_TYPES);
4160 if (!health_relayd) {
4161 PERROR("health_app_create error");
4162 retval = -1;
4163 goto exit_health_app_create;
4164 }
4165
3fd27398 4166 /* Create thread quit pipe */
178a0557
MD		 4167 if (init_thread_quit_pipe()) {
4168 retval = -1;
4169 goto exit_init_data;
b8aa1682
JD		 4170 }
4171
b8aa1682 4172 /* Setup the thread apps communication pipe. */
178a0557
MD		 4173 if (create_relay_conn_pipe()) {
4174 retval = -1;
4175 goto exit_init_data;
b8aa1682
JD		 4176 }
4177
4178 /* Init relay command queue. */
8bdee6e2 4179 cds_wfcq_init(&relay_conn_queue.head, &relay_conn_queue.tail);
b8aa1682 4180
554831e7
MD		 4181 /* Initialize communication library */
4182 lttcomm_init();
87e45c13 4183 lttcomm_inet_init();
554831e7 4184
d3e2ba59 4185 /* tables of sessions indexed by session ID */
7591bab1
MD		 4186 sessions_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
4187 if (!sessions_ht) {
178a0557
MD		 4188 retval = -1;
4189 goto exit_init_data;
d3e2ba59
JD		 4190 }
4191
4192 /* tables of streams indexed by stream ID */
2a174661 4193 relay_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d3e2ba59 4194 if (!relay_streams_ht) {
178a0557
MD		 4195 retval = -1;
4196 goto exit_init_data;
d3e2ba59
JD		 4197 }
4198
4199 /* tables of streams indexed by stream ID */
92c6ca54
DG		 4200 viewer_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
4201 if (!viewer_streams_ht) {
178a0557
MD		 4202 retval = -1;
4203 goto exit_init_data;
55706a7d
MD		 4204 }
4205
65931c8b 4206 ret = utils_create_pipe(health_quit_pipe);
178a0557
MD		 4207 if (ret) {
4208 retval = -1;
4209 goto exit_health_quit_pipe;
65931c8b
MD		 4210 }
4211
4212 /* Create thread to manage the client socket */
1a1a34b4 4213 ret = pthread_create(&health_thread, default_pthread_attr(),
65931c8b 4214 thread_manage_health, (void *) NULL);
178a0557
MD		 4215 if (ret) {
4216 errno = ret;
65931c8b 4217 PERROR("pthread_create health");
178a0557
MD		 4218 retval = -1;
4219 goto exit_health_thread;
65931c8b
MD		 4220 }
4221
b8aa1682 4222 /* Setup the dispatcher thread */
1a1a34b4 4223 ret = pthread_create(&dispatcher_thread, default_pthread_attr(),
b8aa1682 4224 relay_thread_dispatcher, (void *) NULL);
178a0557
MD		 4225 if (ret) {
4226 errno = ret;
b8aa1682 4227 PERROR("pthread_create dispatcher");
178a0557
MD		 4228 retval = -1;
4229 goto exit_dispatcher_thread;
b8aa1682
JD		 4230 }
4231
4232 /* Setup the worker thread */
1a1a34b4 4233 ret = pthread_create(&worker_thread, default_pthread_attr(),
7591bab1 4234 relay_thread_worker, NULL);
178a0557
MD		 4235 if (ret) {
4236 errno = ret;
b8aa1682 4237 PERROR("pthread_create worker");
178a0557
MD		 4238 retval = -1;
4239 goto exit_worker_thread;
b8aa1682
JD		 4240 }
4241
4242 /* Setup the listener thread */
1a1a34b4 4243 ret = pthread_create(&listener_thread, default_pthread_attr(),
b8aa1682 4244 relay_thread_listener, (void *) NULL);
178a0557
MD		 4245 if (ret) {
4246 errno = ret;
b8aa1682 4247 PERROR("pthread_create listener");
178a0557
MD		 4248 retval = -1;
4249 goto exit_listener_thread;
b8aa1682
JD		 4250 }
4251
7591bab1 4252 ret = relayd_live_create(live_uri);
178a0557 4253 if (ret) {
d3e2ba59 4254 ERR("Starting live viewer threads");
178a0557 4255 retval = -1;
50138f51 4256 goto exit_live;
d3e2ba59
JD		 4257 }
4258
178a0557
MD		 4259 /*
4260 * This is where we start awaiting program completion (e.g. through
4261 * signal that asks threads to teardown).
4262 */
4263
4264 ret = relayd_live_join();
4265 if (ret) {
4266 retval = -1;
4267 }
50138f51 4268exit_live:
178a0557 4269
b8aa1682 4270 ret = pthread_join(listener_thread, &status);
178a0557
MD		 4271 if (ret) {
4272 errno = ret;
4273 PERROR("pthread_join listener_thread");
4274 retval = -1;
b8aa1682
JD		 4275 }
4276
178a0557 4277exit_listener_thread:
b8aa1682 4278 ret = pthread_join(worker_thread, &status);
178a0557
MD		 4279 if (ret) {
4280 errno = ret;
4281 PERROR("pthread_join worker_thread");
4282 retval = -1;
b8aa1682
JD		 4283 }
4284
178a0557 4285exit_worker_thread:
b8aa1682 4286 ret = pthread_join(dispatcher_thread, &status);
178a0557
MD		 4287 if (ret) {
4288 errno = ret;
4289 PERROR("pthread_join dispatcher_thread");
4290 retval = -1;
b8aa1682 4291 }
178a0557 4292exit_dispatcher_thread:
42415026 4293
65931c8b 4294 ret = pthread_join(health_thread, &status);
178a0557
MD		 4295 if (ret) {
4296 errno = ret;
4297 PERROR("pthread_join health_thread");
4298 retval = -1;
65931c8b 4299 }
178a0557 4300exit_health_thread:
65931c8b 4301
65931c8b 4302 utils_close_pipe(health_quit_pipe);
178a0557 4303exit_health_quit_pipe:
65931c8b 4304
178a0557 4305exit_init_data:
55706a7d 4306 health_app_destroy(health_relayd);
55706a7d 4307exit_health_app_create:
178a0557 4308exit_options:
4d62fbf8
MD		 4309 /*
4310 * Wait for all pending call_rcu work to complete before tearing
4311 * down data structures. call_rcu worker may be trying to
4312 * perform lookups in those structures.
4313 */
4314 rcu_barrier();
7591bab1
MD		 4315 relayd_cleanup();
4316
4317 /* Ensure all prior call_rcu are done. */
4318 rcu_barrier();
d3e2ba59 4319
178a0557 4320 if (!retval) {
b8aa1682 4321 exit(EXIT_SUCCESS);
178a0557
MD		 4322 } else {
4323 exit(EXIT_FAILURE);
b8aa1682 4324 }
b8aa1682 4325}
LTTng tools - Deliverables
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