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Add DBG statement for TCP keep-alive options
[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
b8aa1682 86/* command line options */
0f907de1 87char *opt_output_path;
b5218ffb 88static int opt_daemon, opt_background;
3fd27398
MD		 89
90/*
91 * We need to wait for listener and live listener threads, as well as
92 * health check thread, before being ready to signal readiness.
93 */
94#define NR_LTTNG_RELAY_READY 3
95static int lttng_relay_ready = NR_LTTNG_RELAY_READY;
0848dba7
MD		 96
97/* Size of receive buffer. */
98#define RECV_DATA_BUFFER_SIZE 65536
d3ecc550 99#define FILE_COPY_BUFFER_SIZE 65536
0848dba7 100
3fd27398
MD		 101static int recv_child_signal; /* Set to 1 when a SIGUSR1 signal is received. */
102static pid_t child_ppid; /* Internal parent PID use with daemonize. */
103
095a4ae5
MD		 104static struct lttng_uri *control_uri;
105static struct lttng_uri *data_uri;
d3e2ba59 106static struct lttng_uri *live_uri;
b8aa1682
JD		 107
108const char *progname;
b8aa1682 109
65931c8b 110const char *tracing_group_name = DEFAULT_TRACING_GROUP;
cd60b05a
JG		 111static int tracing_group_name_override;
112
113const char * const config_section_name = "relayd";
65931c8b 114
b8aa1682
JD		 115/*
116 * Quit pipe for all threads. This permits a single cancellation point
117 * for all threads when receiving an event on the pipe.
118 */
0b242f62 119int thread_quit_pipe[2] = { -1, -1 };
b8aa1682
JD		 120
121/*
122 * This pipe is used to inform the worker thread that a command is queued and
123 * ready to be processed.
124 */
58eb9381 125static int relay_conn_pipe[2] = { -1, -1 };
b8aa1682 126
26c9d55e 127/* Shared between threads */
b8aa1682
JD		 128static int dispatch_thread_exit;
129
130static pthread_t listener_thread;
131static pthread_t dispatcher_thread;
132static pthread_t worker_thread;
65931c8b 133static pthread_t health_thread;
b8aa1682 134
7591bab1
MD		 135/*
136 * last_relay_stream_id_lock protects last_relay_stream_id increment
137 * atomicity on 32-bit architectures.
138 */
139static pthread_mutex_t last_relay_stream_id_lock = PTHREAD_MUTEX_INITIALIZER;
095a4ae5 140static uint64_t last_relay_stream_id;
b8aa1682
JD		 141
142/*
143 * Relay command queue.
144 *
145 * The relay_thread_listener and relay_thread_dispatcher communicate with this
146 * queue.
147 */
58eb9381 148static struct relay_conn_queue relay_conn_queue;
b8aa1682 149
d3e2ba59
JD		 150/* Global relay stream hash table. */
151struct lttng_ht *relay_streams_ht;
152
92c6ca54
DG		 153/* Global relay viewer stream hash table. */
154struct lttng_ht *viewer_streams_ht;
155
7591bab1
MD		 156/* Global relay sessions hash table. */
157struct lttng_ht *sessions_ht;
0a6518b0 158
55706a7d 159/* Relayd health monitoring */
eea7556c 160struct health_app *health_relayd;
55706a7d 161
cd60b05a
JG		 162static struct option long_options[] = {
163 { "control-port", 1, 0, 'C', },
164 { "data-port", 1, 0, 'D', },
8d5c808e 165 { "live-port", 1, 0, 'L', },
cd60b05a 166 { "daemonize", 0, 0, 'd', },
b5218ffb 167 { "background", 0, 0, 'b', },
cd60b05a
JG		 168 { "group", 1, 0, 'g', },
169 { "help", 0, 0, 'h', },
170 { "output", 1, 0, 'o', },
171 { "verbose", 0, 0, 'v', },
172 { "config", 1, 0, 'f' },
3a904098 173 { "version", 0, 0, 'V' },
cd60b05a
JG		 174 { NULL, 0, 0, 0, },
175};
176
3a904098 177static const char *config_ignore_options[] = { "help", "config", "version" };
cd60b05a 178
cd60b05a
JG		 179/*
180 * Take an option from the getopt output and set it in the right variable to be
181 * used later.
182 *
183 * Return 0 on success else a negative value.
184 */
7591bab1 185static int set_option(int opt, const char *arg, const char *optname)
b8aa1682 186{
cd60b05a
JG		 187 int ret;
188
189 switch (opt) {
190 case 0:
191 fprintf(stderr, "option %s", optname);
192 if (arg) {
193 fprintf(stderr, " with arg %s\n", arg);
194 }
195 break;
196 case 'C':
e8fa9fb0
MD		 197 if (lttng_is_setuid_setgid()) {
198 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
199 "-C, --control-port");
200 } else {
201 ret = uri_parse(arg, &control_uri);
202 if (ret < 0) {
203 ERR("Invalid control URI specified");
204 goto end;
205 }
206 if (control_uri->port == 0) {
207 control_uri->port = DEFAULT_NETWORK_CONTROL_PORT;
208 }
cd60b05a
JG		 209 }
210 break;
211 case 'D':
e8fa9fb0
MD		 212 if (lttng_is_setuid_setgid()) {
213 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
214 "-D, -data-port");
215 } else {
216 ret = uri_parse(arg, &data_uri);
217 if (ret < 0) {
218 ERR("Invalid data URI specified");
219 goto end;
220 }
221 if (data_uri->port == 0) {
222 data_uri->port = DEFAULT_NETWORK_DATA_PORT;
223 }
cd60b05a
JG		 224 }
225 break;
8d5c808e 226 case 'L':
e8fa9fb0
MD		 227 if (lttng_is_setuid_setgid()) {
228 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
229 "-L, -live-port");
230 } else {
231 ret = uri_parse(arg, &live_uri);
232 if (ret < 0) {
233 ERR("Invalid live URI specified");
234 goto end;
235 }
236 if (live_uri->port == 0) {
237 live_uri->port = DEFAULT_NETWORK_VIEWER_PORT;
238 }
8d5c808e
AM		 239 }
240 break;
cd60b05a
JG		 241 case 'd':
242 opt_daemon = 1;
243 break;
b5218ffb
MD		 244 case 'b':
245 opt_background = 1;
246 break;
cd60b05a 247 case 'g':
e8fa9fb0
MD		 248 if (lttng_is_setuid_setgid()) {
249 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
250 "-g, --group");
251 } else {
252 tracing_group_name = strdup(arg);
253 if (tracing_group_name == NULL) {
254 ret = -errno;
255 PERROR("strdup");
256 goto end;
257 }
258 tracing_group_name_override = 1;
330a40bb 259 }
cd60b05a
JG		 260 break;
261 case 'h':
4fc83d94 262 ret = utils_show_help(8, "lttng-relayd", help_msg);
655b5cc1 263 if (ret) {
4fc83d94 264 ERR("Cannot show --help for `lttng-relayd`");
655b5cc1
PP		 265 perror("exec");
266 }
cd60b05a 267 exit(EXIT_FAILURE);
3a904098
AW		 268 case 'V':
269 fprintf(stdout, "%s\n", VERSION);
270 exit(EXIT_SUCCESS);
cd60b05a 271 case 'o':
e8fa9fb0
MD		 272 if (lttng_is_setuid_setgid()) {
273 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
274 "-o, --output");
275 } else {
276 ret = asprintf(&opt_output_path, "%s", arg);
277 if (ret < 0) {
278 ret = -errno;
279 PERROR("asprintf opt_output_path");
280 goto end;
281 }
cd60b05a
JG		 282 }
283 break;
284 case 'v':
285 /* Verbose level can increase using multiple -v */
286 if (arg) {
287 lttng_opt_verbose = config_parse_value(arg);
288 } else {
849e5b7b
DG		 289 /* Only 3 level of verbosity (-vvv). */
290 if (lttng_opt_verbose < 3) {
291 lttng_opt_verbose += 1;
292 }
cd60b05a
JG		 293 }
294 break;
295 default:
296 /* Unknown option or other error.
297 * Error is printed by getopt, just return */
298 ret = -1;
299 goto end;
300 }
301
302 /* All good. */
303 ret = 0;
304
305end:
306 return ret;
307}
308
309/*
310 * config_entry_handler_cb used to handle options read from a config file.
f40ef1d5 311 * See config_entry_handler_cb comment in common/config/session-config.h for the
cd60b05a
JG		 312 * return value conventions.
313 */
7591bab1 314static int config_entry_handler(const struct config_entry *entry, void *unused)
cd60b05a
JG		 315{
316 int ret = 0, i;
317
318 if (!entry || !entry->name || !entry->value) {
319 ret = -EINVAL;
320 goto end;
321 }
322
323 /* Check if the option is to be ignored */
324 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
325 if (!strcmp(entry->name, config_ignore_options[i])) {
326 goto end;
327 }
328 }
329
330 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
331 /* Ignore if entry name is not fully matched. */
332 if (strcmp(entry->name, long_options[i].name)) {
333 continue;
334 }
335
336 /*
7591bab1
MD		 337 * If the option takes no argument on the command line,
338 * we have to check if the value is "true". We support
339 * non-zero numeric values, true, on and yes.
cd60b05a
JG		 340 */
341 if (!long_options[i].has_arg) {
342 ret = config_parse_value(entry->value);
343 if (ret <= 0) {
344 if (ret) {
345 WARN("Invalid configuration value \"%s\" for option %s",
346 entry->value, entry->name);
347 }
348 /* False, skip boolean config option. */
349 goto end;
350 }
351 }
352
353 ret = set_option(long_options[i].val, entry->value, entry->name);
354 goto end;
355 }
356
357 WARN("Unrecognized option \"%s\" in daemon configuration file.",
358 entry->name);
359
360end:
361 return ret;
362}
363
7591bab1 364static int set_options(int argc, char **argv)
cd60b05a 365{
178a0557 366 int c, ret = 0, option_index = 0, retval = 0;
cd60b05a
JG		 367 int orig_optopt = optopt, orig_optind = optind;
368 char *default_address, *optstring;
369 const char *config_path = NULL;
370
371 optstring = utils_generate_optstring(long_options,
372 sizeof(long_options) / sizeof(struct option));
373 if (!optstring) {
178a0557 374 retval = -ENOMEM;
cd60b05a
JG		 375 goto exit;
376 }
377
378 /* Check for the --config option */
379
380 while ((c = getopt_long(argc, argv, optstring, long_options,
381 &option_index)) != -1) {
382 if (c == '?') {
178a0557 383 retval = -EINVAL;
cd60b05a
JG		 384 goto exit;
385 } else if (c != 'f') {
386 continue;
387 }
388
e8fa9fb0
MD		 389 if (lttng_is_setuid_setgid()) {
390 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
391 "-f, --config");
392 } else {
393 config_path = utils_expand_path(optarg);
394 if (!config_path) {
395 ERR("Failed to resolve path: %s", optarg);
396 }
cd60b05a
JG		 397 }
398 }
399
400 ret = config_get_section_entries(config_path, config_section_name,
401 config_entry_handler, NULL);
402 if (ret) {
403 if (ret > 0) {
404 ERR("Invalid configuration option at line %i", ret);
cd60b05a 405 }
178a0557 406 retval = -1;
cd60b05a
JG		 407 goto exit;
408 }
b8aa1682 409
cd60b05a
JG		 410 /* Reset getopt's global state */
411 optopt = orig_optopt;
412 optind = orig_optind;
b8aa1682 413 while (1) {
cd60b05a 414 c = getopt_long(argc, argv, optstring, long_options, &option_index);
b8aa1682
JD		 415 if (c == -1) {
416 break;
417 }
418
cd60b05a
JG		 419 ret = set_option(c, optarg, long_options[option_index].name);
420 if (ret < 0) {
178a0557 421 retval = -1;
b8aa1682
JD		 422 goto exit;
423 }
424 }
425
426 /* assign default values */
427 if (control_uri == NULL) {
fa91dc52
MD		 428 ret = asprintf(&default_address,
429 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS ":%d",
430 DEFAULT_NETWORK_CONTROL_PORT);
b8aa1682
JD		 431 if (ret < 0) {
432 PERROR("asprintf default data address");
178a0557 433 retval = -1;
b8aa1682
JD		 434 goto exit;
435 }
436
437 ret = uri_parse(default_address, &control_uri);
438 free(default_address);
439 if (ret < 0) {
440 ERR("Invalid control URI specified");
178a0557 441 retval = -1;
b8aa1682
JD		 442 goto exit;
443 }
444 }
445 if (data_uri == NULL) {
fa91dc52
MD		 446 ret = asprintf(&default_address,
447 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS ":%d",
448 DEFAULT_NETWORK_DATA_PORT);
b8aa1682
JD		 449 if (ret < 0) {
450 PERROR("asprintf default data address");
178a0557 451 retval = -1;
b8aa1682
JD		 452 goto exit;
453 }
454
455 ret = uri_parse(default_address, &data_uri);
456 free(default_address);
457 if (ret < 0) {
458 ERR("Invalid data URI specified");
178a0557 459 retval = -1;
b8aa1682
JD		 460 goto exit;
461 }
462 }
d3e2ba59 463 if (live_uri == NULL) {
fa91dc52
MD		 464 ret = asprintf(&default_address,
465 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS ":%d",
466 DEFAULT_NETWORK_VIEWER_PORT);
d3e2ba59
JD		 467 if (ret < 0) {
468 PERROR("asprintf default viewer control address");
178a0557 469 retval = -1;
d3e2ba59
JD		 470 goto exit;
471 }
472
473 ret = uri_parse(default_address, &live_uri);
474 free(default_address);
475 if (ret < 0) {
476 ERR("Invalid viewer control URI specified");
178a0557 477 retval = -1;
d3e2ba59
JD		 478 goto exit;
479 }
480 }
b8aa1682
JD		 481
482exit:
cd60b05a 483 free(optstring);
178a0557 484 return retval;
b8aa1682
JD		 485}
486
7591bab1
MD		 487static void print_global_objects(void)
488{
489 rcu_register_thread();
490
491 print_viewer_streams();
492 print_relay_streams();
493 print_sessions();
494
495 rcu_unregister_thread();
496}
497
b8aa1682
JD		 498/*
499 * Cleanup the daemon
500 */
7591bab1 501static void relayd_cleanup(void)
b8aa1682 502{
7591bab1
MD		 503 print_global_objects();
504
b8aa1682
JD		 505 DBG("Cleaning up");
506
178a0557
MD		 507 if (viewer_streams_ht)
508 lttng_ht_destroy(viewer_streams_ht);
509 if (relay_streams_ht)
510 lttng_ht_destroy(relay_streams_ht);
7591bab1
MD		 511 if (sessions_ht)
512 lttng_ht_destroy(sessions_ht);
178a0557 513
095a4ae5
MD		 514 /* free the dynamically allocated opt_output_path */
515 free(opt_output_path);
516
a02de639
CB		 517 /* Close thread quit pipes */
518 utils_close_pipe(thread_quit_pipe);
519
710c1f73
DG		 520 uri_free(control_uri);
521 uri_free(data_uri);
8d5c808e 522 /* Live URI is freed in the live thread. */
cd60b05a
JG		 523
524 if (tracing_group_name_override) {
525 free((void *) tracing_group_name);
526 }
b8aa1682
JD		 527}
528
529/*
530 * Write to writable pipe used to notify a thread.
531 */
7591bab1 532static int notify_thread_pipe(int wpipe)
b8aa1682 533{
6cd525e8 534 ssize_t ret;
b8aa1682 535
6cd525e8
MD		 536 ret = lttng_write(wpipe, "!", 1);
537 if (ret < 1) {
b8aa1682 538 PERROR("write poll pipe");
b4aacfdc 539 goto end;
b8aa1682 540 }
b4aacfdc
MD		 541 ret = 0;
542end:
b8aa1682
JD		 543 return ret;
544}
545
7591bab1 546static int notify_health_quit_pipe(int *pipe)
65931c8b 547{
6cd525e8 548 ssize_t ret;
65931c8b 549
6cd525e8
MD		 550 ret = lttng_write(pipe[1], "4", 1);
551 if (ret < 1) {
65931c8b 552 PERROR("write relay health quit");
b4aacfdc 553 goto end;
65931c8b 554 }
b4aacfdc
MD		 555 ret = 0;
556end:
557 return ret;
65931c8b
MD		 558}
559
b8aa1682 560/*
b4aacfdc 561 * Stop all relayd and relayd-live threads.
b8aa1682 562 */
b4aacfdc 563int lttng_relay_stop_threads(void)
b8aa1682 564{
b4aacfdc 565 int retval = 0;
b8aa1682
JD		 566
567 /* Stopping all threads */
568 DBG("Terminating all threads");
b4aacfdc 569 if (notify_thread_pipe(thread_quit_pipe[1])) {
b8aa1682 570 ERR("write error on thread quit pipe");
b4aacfdc 571 retval = -1;
b8aa1682
JD		 572 }
573
b4aacfdc
MD		 574 if (notify_health_quit_pipe(health_quit_pipe)) {
575 ERR("write error on health quit pipe");
576 }
65931c8b 577
b8aa1682 578 /* Dispatch thread */
26c9d55e 579 CMM_STORE_SHARED(dispatch_thread_exit, 1);
58eb9381 580 futex_nto1_wake(&relay_conn_queue.futex);
178a0557 581
b4aacfdc 582 if (relayd_live_stop()) {
178a0557 583 ERR("Error stopping live threads");
b4aacfdc 584 retval = -1;
178a0557 585 }
b4aacfdc 586 return retval;
b8aa1682
JD		 587}
588
589/*
590 * Signal handler for the daemon
591 *
592 * Simply stop all worker threads, leaving main() return gracefully after
593 * joining all threads and calling cleanup().
594 */
7591bab1 595static void sighandler(int sig)
b8aa1682
JD		 596{
597 switch (sig) {
b8aa1682
JD		 598 case SIGINT:
599 DBG("SIGINT caught");
b4aacfdc
MD		 600 if (lttng_relay_stop_threads()) {
601 ERR("Error stopping threads");
602 }
b8aa1682
JD		 603 break;
604 case SIGTERM:
605 DBG("SIGTERM caught");
b4aacfdc
MD		 606 if (lttng_relay_stop_threads()) {
607 ERR("Error stopping threads");
608 }
b8aa1682 609 break;
3fd27398
MD		 610 case SIGUSR1:
611 CMM_STORE_SHARED(recv_child_signal, 1);
612 break;
b8aa1682
JD		 613 default:
614 break;
615 }
616}
617
618/*
619 * Setup signal handler for :
620 * SIGINT, SIGTERM, SIGPIPE
621 */
7591bab1 622static int set_signal_handler(void)
b8aa1682
JD		 623{
624 int ret = 0;
625 struct sigaction sa;
626 sigset_t sigset;
627
628 if ((ret = sigemptyset(&sigset)) < 0) {
629 PERROR("sigemptyset");
630 return ret;
631 }
632
b8aa1682
JD		 633 sa.sa_mask = sigset;
634 sa.sa_flags = 0;
0072e5e2
MD		 635
636 sa.sa_handler = sighandler;
b8aa1682
JD		 637 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
638 PERROR("sigaction");
639 return ret;
640 }
641
642 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
643 PERROR("sigaction");
644 return ret;
645 }
646
0072e5e2 647 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
b8aa1682
JD		 648 PERROR("sigaction");
649 return ret;
650 }
651
0072e5e2
MD		 652 sa.sa_handler = SIG_IGN;
653 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3fd27398
MD		 654 PERROR("sigaction");
655 return ret;
656 }
657
658 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
b8aa1682
JD		 659
660 return ret;
661}
662
3fd27398
MD		 663void lttng_relay_notify_ready(void)
664{
665 /* Notify the parent of the fork() process that we are ready. */
666 if (opt_daemon || opt_background) {
667 if (uatomic_sub_return(&lttng_relay_ready, 1) == 0) {
668 kill(child_ppid, SIGUSR1);
669 }
670 }
671}
672
b8aa1682
JD		 673/*
674 * Init thread quit pipe.
675 *
676 * Return -1 on error or 0 if all pipes are created.
677 */
7591bab1 678static int init_thread_quit_pipe(void)
b8aa1682 679{
a02de639 680 int ret;
b8aa1682 681
a02de639 682 ret = utils_create_pipe_cloexec(thread_quit_pipe);
b8aa1682 683
b8aa1682
JD		 684 return ret;
685}
686
687/*
688 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
689 */
7591bab1 690static int create_thread_poll_set(struct lttng_poll_event *events, int size)
b8aa1682
JD		 691{
692 int ret;
693
694 if (events == NULL || size == 0) {
695 ret = -1;
696 goto error;
697 }
698
699 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
700 if (ret < 0) {
701 goto error;
702 }
703
704 /* Add quit pipe */
c7759e6a 705 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
b8aa1682
JD		 706 if (ret < 0) {
707 goto error;
708 }
709
710 return 0;
711
712error:
713 return ret;
714}
715
716/*
717 * Check if the thread quit pipe was triggered.
718 *
719 * Return 1 if it was triggered else 0;
720 */
7591bab1 721static int check_thread_quit_pipe(int fd, uint32_t events)
b8aa1682
JD		 722{
723 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
724 return 1;
725 }
726
727 return 0;
728}
729
730/*
731 * Create and init socket from uri.
732 */
7591bab1 733static struct lttcomm_sock *relay_socket_create(struct lttng_uri *uri)
b8aa1682
JD		 734{
735 int ret;
736 struct lttcomm_sock *sock = NULL;
737
738 sock = lttcomm_alloc_sock_from_uri(uri);
739 if (sock == NULL) {
740 ERR("Allocating socket");
741 goto error;
742 }
743
744 ret = lttcomm_create_sock(sock);
745 if (ret < 0) {
746 goto error;
747 }
748 DBG("Listening on sock %d", sock->fd);
749
750 ret = sock->ops->bind(sock);
751 if (ret < 0) {
2288467f 752 PERROR("Failed to bind socket");
b8aa1682
JD		 753 goto error;
754 }
755
756 ret = sock->ops->listen(sock, -1);
757 if (ret < 0) {
758 goto error;
759
760 }
761
762 return sock;
763
764error:
765 if (sock) {
766 lttcomm_destroy_sock(sock);
767 }
768 return NULL;
769}
770
771/*
772 * This thread manages the listening for new connections on the network
773 */
7591bab1 774static void *relay_thread_listener(void *data)
b8aa1682 775{
095a4ae5 776 int i, ret, pollfd, err = -1;
b8aa1682
JD		 777 uint32_t revents, nb_fd;
778 struct lttng_poll_event events;
779 struct lttcomm_sock *control_sock, *data_sock;
780
b8aa1682
JD		 781 DBG("[thread] Relay listener started");
782
55706a7d
MD		 783 health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
784
f385ae0a
MD		 785 health_code_update();
786
7591bab1 787 control_sock = relay_socket_create(control_uri);
b8aa1682 788 if (!control_sock) {
095a4ae5 789 goto error_sock_control;
b8aa1682
JD		 790 }
791
7591bab1 792 data_sock = relay_socket_create(data_uri);
b8aa1682 793 if (!data_sock) {
095a4ae5 794 goto error_sock_relay;
b8aa1682
JD		 795 }
796
797 /*
7591bab1
MD		 798 * Pass 3 as size here for the thread quit pipe, control and
799 * data socket.
b8aa1682
JD		 800 */
801 ret = create_thread_poll_set(&events, 3);
802 if (ret < 0) {
803 goto error_create_poll;
804 }
805
806 /* Add the control socket */
807 ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP);
808 if (ret < 0) {
809 goto error_poll_add;
810 }
811
812 /* Add the data socket */
813 ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP);
814 if (ret < 0) {
815 goto error_poll_add;
816 }
817
3fd27398
MD		 818 lttng_relay_notify_ready();
819
9b5e0863
MD		 820 if (testpoint(relayd_thread_listener)) {
821 goto error_testpoint;
822 }
823
b8aa1682 824 while (1) {
f385ae0a
MD		 825 health_code_update();
826
b8aa1682
JD		 827 DBG("Listener accepting connections");
828
b8aa1682 829restart:
f385ae0a 830 health_poll_entry();
b8aa1682 831 ret = lttng_poll_wait(&events, -1);
f385ae0a 832 health_poll_exit();
b8aa1682
JD		 833 if (ret < 0) {
834 /*
835 * Restart interrupted system call.
836 */
837 if (errno == EINTR) {
838 goto restart;
839 }
840 goto error;
841 }
842
0d9c5d77
DG		 843 nb_fd = ret;
844
b8aa1682
JD		 845 DBG("Relay new connection received");
846 for (i = 0; i < nb_fd; i++) {
f385ae0a
MD		 847 health_code_update();
848
b8aa1682
JD		 849 /* Fetch once the poll data */
850 revents = LTTNG_POLL_GETEV(&events, i);
851 pollfd = LTTNG_POLL_GETFD(&events, i);
852
fd20dac9 853 if (!revents) {
7591bab1
MD		 854 /*
855 * No activity for this FD (poll
856 * implementation).
857 */
fd20dac9
MD		 858 continue;
859 }
860
b8aa1682
JD		 861 /* Thread quit pipe has been closed. Killing thread. */
862 ret = check_thread_quit_pipe(pollfd, revents);
863 if (ret) {
095a4ae5
MD		 864 err = 0;
865 goto exit;
b8aa1682
JD		 866 }
867
03e43155 868 if (revents & LPOLLIN) {
4b7f17b2 869 /*
7591bab1
MD		 870 * A new connection is requested, therefore a
871 * sessiond/consumerd connection is allocated in
872 * this thread, enqueued to a global queue and
873 * dequeued (and freed) in the worker thread.
4b7f17b2 874 */
58eb9381
DG		 875 int val = 1;
876 struct relay_connection *new_conn;
4b7f17b2 877 struct lttcomm_sock *newsock;
7591bab1 878 enum connection_type type;
b8aa1682
JD		 879
880 if (pollfd == data_sock->fd) {
7591bab1 881 type = RELAY_DATA;
b8aa1682 882 newsock = data_sock->ops->accept(data_sock);
58eb9381
DG		 883 DBG("Relay data connection accepted, socket %d",
884 newsock->fd);
4b7f17b2
MD		 885 } else {
886 assert(pollfd == control_sock->fd);
7591bab1 887 type = RELAY_CONTROL;
b8aa1682 888 newsock = control_sock->ops->accept(control_sock);
58eb9381
DG		 889 DBG("Relay control connection accepted, socket %d",
890 newsock->fd);
b8aa1682 891 }
58eb9381
DG		 892 if (!newsock) {
893 PERROR("accepting sock");
58eb9381
DG		 894 goto error;
895 }
896
897 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
898 sizeof(val));
b8aa1682
JD		 899 if (ret < 0) {
900 PERROR("setsockopt inet");
4b7f17b2 901 lttcomm_destroy_sock(newsock);
b8aa1682
JD		 902 goto error;
903 }
f056029c
JR		 904
905 ret = socket_apply_keep_alive_config(newsock->fd);
906 if (ret < 0) {
907 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
908 newsock->fd);
909 lttcomm_destroy_sock(newsock);
910 goto error;
911 }
912
7591bab1
MD		 913 new_conn = connection_create(newsock, type);
914 if (!new_conn) {
915 lttcomm_destroy_sock(newsock);
916 goto error;
917 }
58eb9381
DG		 918
919 /* Enqueue request for the dispatcher thread. */
8bdee6e2
SM		 920 cds_wfcq_enqueue(&relay_conn_queue.head, &relay_conn_queue.tail,
921 &new_conn->qnode);
b8aa1682
JD		 922
923 /*
7591bab1
MD		 924 * Wake the dispatch queue futex.
925 * Implicit memory barrier with the
926 * exchange in cds_wfcq_enqueue.
b8aa1682 927 */
58eb9381 928 futex_nto1_wake(&relay_conn_queue.futex);
03e43155
MD		 929 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
930 ERR("socket poll error");
931 goto error;
932 } else {
933 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
934 goto error;
b8aa1682
JD		 935 }
936 }
937 }
938
095a4ae5 939exit:
b8aa1682
JD		 940error:
941error_poll_add:
9b5e0863 942error_testpoint:
b8aa1682
JD		 943 lttng_poll_clean(&events);
944error_create_poll:
095a4ae5
MD		 945 if (data_sock->fd >= 0) {
946 ret = data_sock->ops->close(data_sock);
b8aa1682
JD		 947 if (ret) {
948 PERROR("close");
949 }
b8aa1682 950 }
095a4ae5
MD		 951 lttcomm_destroy_sock(data_sock);
952error_sock_relay:
953 if (control_sock->fd >= 0) {
954 ret = control_sock->ops->close(control_sock);
b8aa1682
JD		 955 if (ret) {
956 PERROR("close");
957 }
b8aa1682 958 }
095a4ae5
MD		 959 lttcomm_destroy_sock(control_sock);
960error_sock_control:
961 if (err) {
f385ae0a
MD		 962 health_error();
963 ERR("Health error occurred in %s", __func__);
095a4ae5 964 }
55706a7d 965 health_unregister(health_relayd);
b8aa1682 966 DBG("Relay listener thread cleanup complete");
b4aacfdc 967 lttng_relay_stop_threads();
b8aa1682
JD		 968 return NULL;
969}
970
971/*
972 * This thread manages the dispatching of the requests to worker threads
973 */
7591bab1 974static void *relay_thread_dispatcher(void *data)
b8aa1682 975{
6cd525e8
MD		 976 int err = -1;
977 ssize_t ret;
8bdee6e2 978 struct cds_wfcq_node *node;
58eb9381 979 struct relay_connection *new_conn = NULL;
b8aa1682
JD		 980
981 DBG("[thread] Relay dispatcher started");
982
55706a7d
MD		 983 health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER);
984
9b5e0863
MD		 985 if (testpoint(relayd_thread_dispatcher)) {
986 goto error_testpoint;
987 }
988
f385ae0a
MD		 989 health_code_update();
990
0ed3b1a8 991 for (;;) {
f385ae0a
MD		 992 health_code_update();
993
b8aa1682 994 /* Atomically prepare the queue futex */
58eb9381 995 futex_nto1_prepare(&relay_conn_queue.futex);
b8aa1682 996
0ed3b1a8
MD		 997 if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
998 break;
999 }
1000
b8aa1682 1001 do {
f385ae0a
MD		 1002 health_code_update();
1003
b8aa1682 1004 /* Dequeue commands */
8bdee6e2
SM		 1005 node = cds_wfcq_dequeue_blocking(&relay_conn_queue.head,
1006 &relay_conn_queue.tail);
b8aa1682
JD		 1007 if (node == NULL) {
1008 DBG("Woken up but nothing in the relay command queue");
1009 /* Continue thread execution */
1010 break;
1011 }
58eb9381 1012 new_conn = caa_container_of(node, struct relay_connection, qnode);
b8aa1682 1013
58eb9381 1014 DBG("Dispatching request waiting on sock %d", new_conn->sock->fd);
b8aa1682
JD		 1015
1016 /*
7591bab1
MD		 1017 * Inform worker thread of the new request. This
1018 * call is blocking so we can be assured that
1019 * the data will be read at some point in time
1020 * or wait to the end of the world :)
b8aa1682 1021 */
58eb9381
DG		 1022 ret = lttng_write(relay_conn_pipe[1], &new_conn, sizeof(new_conn));
1023 if (ret < 0) {
1024 PERROR("write connection pipe");
7591bab1 1025 connection_put(new_conn);
b8aa1682
JD		 1026 goto error;
1027 }
1028 } while (node != NULL);
1029
1030 /* Futex wait on queue. Blocking call on futex() */
f385ae0a 1031 health_poll_entry();
58eb9381 1032 futex_nto1_wait(&relay_conn_queue.futex);
f385ae0a 1033 health_poll_exit();
b8aa1682
JD		 1034 }
1035
f385ae0a
MD		 1036 /* Normal exit, no error */
1037 err = 0;
1038
b8aa1682 1039error:
9b5e0863 1040error_testpoint:
f385ae0a
MD		 1041 if (err) {
1042 health_error();
1043 ERR("Health error occurred in %s", __func__);
1044 }
55706a7d 1045 health_unregister(health_relayd);
b8aa1682 1046 DBG("Dispatch thread dying");
b4aacfdc 1047 lttng_relay_stop_threads();
b8aa1682
JD		 1048 return NULL;
1049}
1050
b8aa1682 1051/*
7591bab1 1052 * Set index data from the control port to a given index object.
b8aa1682 1053 */
7591bab1 1054static int set_index_control_data(struct relay_index *index,
234cd636
JD		 1055 struct lttcomm_relayd_index *data,
1056 struct relay_connection *conn)
1c20f0e2 1057{
7591bab1 1058 struct ctf_packet_index index_data;
1c20f0e2
JD		 1059
1060 /*
5312a3ed 1061 * The index on disk is encoded in big endian.
1c20f0e2 1062 */
5312a3ed
JG		 1063 index_data.packet_size = htobe64(data->packet_size);
1064 index_data.content_size = htobe64(data->content_size);
1065 index_data.timestamp_begin = htobe64(data->timestamp_begin);
1066 index_data.timestamp_end = htobe64(data->timestamp_end);
1067 index_data.events_discarded = htobe64(data->events_discarded);
1068 index_data.stream_id = htobe64(data->stream_id);
234cd636
JD		 1069
1070 if (conn->minor >= 8) {
5312a3ed
JG		 1071 index->index_data.stream_instance_id = htobe64(data->stream_instance_id);
1072 index->index_data.packet_seq_num = htobe64(data->packet_seq_num);
234cd636
JD		 1073 }
1074
7591bab1 1075 return relay_index_set_data(index, &index_data);
1c20f0e2
JD		 1076}
1077
c5b6f4f0
DG		 1078/*
1079 * Handle the RELAYD_CREATE_SESSION command.
1080 *
1081 * On success, send back the session id or else return a negative value.
1082 */
5312a3ed
JG		 1083static int relay_create_session(const struct lttcomm_relayd_hdr *recv_hdr,
1084 struct relay_connection *conn,
1085 const struct lttng_buffer_view *payload)
c5b6f4f0 1086{
5312a3ed
JG		 1087 int ret = 0;
1088 ssize_t send_ret;
c5b6f4f0
DG		 1089 struct relay_session *session;
1090 struct lttcomm_relayd_status_session reply;
36d2e35d 1091 char session_name[LTTNG_NAME_MAX];
9cf3eb20 1092 char hostname[LTTNG_HOST_NAME_MAX];
7591bab1
MD		 1093 uint32_t live_timer = 0;
1094 bool snapshot = false;
c5b6f4f0 1095
36d2e35d 1096 memset(session_name, 0, LTTNG_NAME_MAX);
9cf3eb20 1097 memset(hostname, 0, LTTNG_HOST_NAME_MAX);
c5b6f4f0
DG		 1098
1099 memset(&reply, 0, sizeof(reply));
1100
58eb9381 1101 switch (conn->minor) {
2a174661
DG		 1102 case 1:
1103 case 2:
1104 case 3:
1105 break;
1106 case 4: /* LTTng sessiond 2.4 */
1107 default:
5312a3ed 1108 ret = cmd_create_session_2_4(payload, session_name,
7591bab1
MD		 1109 hostname, &live_timer, &snapshot);
1110 }
1111 if (ret < 0) {
1112 goto send_reply;
d3e2ba59
JD		 1113 }
1114
7591bab1
MD		 1115 session = session_create(session_name, hostname, live_timer,
1116 snapshot, conn->major, conn->minor);
1117 if (!session) {
1118 ret = -1;
1119 goto send_reply;
1120 }
1121 assert(!conn->session);
1122 conn->session = session;
c5b6f4f0
DG		 1123 DBG("Created session %" PRIu64, session->id);
1124
7591bab1
MD		 1125 reply.session_id = htobe64(session->id);
1126
1127send_reply:
c5b6f4f0
DG		 1128 if (ret < 0) {
1129 reply.ret_code = htobe32(LTTNG_ERR_FATAL);
1130 } else {
1131 reply.ret_code = htobe32(LTTNG_OK);
1132 }
1133
58eb9381 1134 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 1135 if (send_ret < (ssize_t) sizeof(reply)) {
1136 ERR("Failed to send \"create session\" command reply (ret = %zd)",
1137 send_ret);
1138 ret = -1;
c5b6f4f0
DG		 1139 }
1140
1141 return ret;
1142}
1143
a4baae1b
JD		 1144/*
1145 * When we have received all the streams and the metadata for a channel,
1146 * we make them visible to the viewer threads.
1147 */
7591bab1 1148static void publish_connection_local_streams(struct relay_connection *conn)
a4baae1b 1149{
7591bab1
MD		 1150 struct relay_stream *stream;
1151 struct relay_session *session = conn->session;
a4baae1b 1152
7591bab1
MD		 1153 /*
1154 * We publish all streams belonging to a session atomically wrt
1155 * session lock.
1156 */
1157 pthread_mutex_lock(&session->lock);
1158 rcu_read_lock();
1159 cds_list_for_each_entry_rcu(stream, &session->recv_list,
1160 recv_node) {
1161 stream_publish(stream);
a4baae1b 1162 }
7591bab1 1163 rcu_read_unlock();
a4baae1b 1164
7591bab1
MD		 1165 /*
1166 * Inform the viewer that there are new streams in the session.
1167 */
1168 if (session->viewer_attached) {
1169 uatomic_set(&session->new_streams, 1);
1170 }
1171 pthread_mutex_unlock(&session->lock);
a4baae1b
JD		 1172}
1173
b8aa1682
JD		 1174/*
1175 * relay_add_stream: allocate a new stream for a session
1176 */
5312a3ed
JG		 1177static int relay_add_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1178 struct relay_connection *conn,
1179 const struct lttng_buffer_view *payload)
b8aa1682 1180{
7591bab1
MD		 1181 int ret;
1182 ssize_t send_ret;
58eb9381 1183 struct relay_session *session = conn->session;
b8aa1682
JD		 1184 struct relay_stream *stream = NULL;
1185 struct lttcomm_relayd_status_stream reply;
4030a636 1186 struct ctf_trace *trace = NULL;
7591bab1
MD		 1187 uint64_t stream_handle = -1ULL;
1188 char *path_name = NULL, *channel_name = NULL;
1189 uint64_t tracefile_size = 0, tracefile_count = 0;
b8aa1682 1190
5312a3ed 1191 if (!session || !conn->version_check_done) {
b8aa1682
JD		 1192 ERR("Trying to add a stream before version check");
1193 ret = -1;
1194 goto end_no_session;
1195 }
1196
7591bab1
MD		 1197 switch (session->minor) {
1198 case 1: /* LTTng sessiond 2.1. Allocates path_name and channel_name. */
5312a3ed 1199 ret = cmd_recv_stream_2_1(payload, &path_name,
7591bab1 1200 &channel_name);
0f907de1 1201 break;
7591bab1 1202 case 2: /* LTTng sessiond 2.2. Allocates path_name and channel_name. */
0f907de1 1203 default:
5312a3ed 1204 ret = cmd_recv_stream_2_2(payload, &path_name,
7591bab1 1205 &channel_name, &tracefile_size, &tracefile_count);
0f907de1
JD		 1206 break;
1207 }
1208 if (ret < 0) {
7591bab1 1209 goto send_reply;
b8aa1682
JD		 1210 }
1211
7591bab1 1212 trace = ctf_trace_get_by_path_or_create(session, path_name);
2a174661 1213 if (!trace) {
7591bab1 1214 goto send_reply;
2a174661 1215 }
7591bab1 1216 /* This stream here has one reference on the trace. */
2a174661 1217
7591bab1
MD		 1218 pthread_mutex_lock(&last_relay_stream_id_lock);
1219 stream_handle = ++last_relay_stream_id;
1220 pthread_mutex_unlock(&last_relay_stream_id_lock);
d3e2ba59 1221
7591bab1
MD		 1222 /* We pass ownership of path_name and channel_name. */
1223 stream = stream_create(trace, stream_handle, path_name,
1224 channel_name, tracefile_size, tracefile_count);
1225 path_name = NULL;
1226 channel_name = NULL;
a4baae1b 1227
2a174661 1228 /*
7591bab1
MD		 1229 * Streams are the owners of their trace. Reference to trace is
1230 * kept within stream_create().
2a174661 1231 */
7591bab1 1232 ctf_trace_put(trace);
d3e2ba59 1233
7591bab1 1234send_reply:
53efb85a 1235 memset(&reply, 0, sizeof(reply));
7591bab1
MD		 1236 reply.handle = htobe64(stream_handle);
1237 if (!stream) {
f73fabfd 1238 reply.ret_code = htobe32(LTTNG_ERR_UNK);
b8aa1682 1239 } else {
f73fabfd 1240 reply.ret_code = htobe32(LTTNG_OK);
b8aa1682 1241 }
5af40280 1242
58eb9381 1243 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
b8aa1682 1244 sizeof(struct lttcomm_relayd_status_stream), 0);
5312a3ed
JG		 1245 if (send_ret < (ssize_t) sizeof(reply)) {
1246 ERR("Failed to send \"add stream\" command reply (ret = %zd)",
1247 send_ret);
1248 ret = -1;
b8aa1682
JD		 1249 }
1250
1251end_no_session:
7591bab1
MD		 1252 free(path_name);
1253 free(channel_name);
0f907de1 1254 return ret;
b8aa1682
JD		 1255}
1256
173af62f
DG		 1257/*
1258 * relay_close_stream: close a specific stream
1259 */
5312a3ed
JG		 1260static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1261 struct relay_connection *conn,
1262 const struct lttng_buffer_view *payload)
173af62f 1263{
5312a3ed
JG		 1264 int ret;
1265 ssize_t send_ret;
58eb9381 1266 struct relay_session *session = conn->session;
173af62f
DG		 1267 struct lttcomm_relayd_close_stream stream_info;
1268 struct lttcomm_relayd_generic_reply reply;
1269 struct relay_stream *stream;
173af62f
DG		 1270
1271 DBG("Close stream received");
1272
5312a3ed 1273 if (!session || !conn->version_check_done) {
173af62f
DG		 1274 ERR("Trying to close a stream before version check");
1275 ret = -1;
1276 goto end_no_session;
1277 }
1278
5312a3ed
JG		 1279 if (payload->size < sizeof(stream_info)) {
1280 ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
1281 sizeof(stream_info), payload->size);
173af62f
DG		 1282 ret = -1;
1283 goto end_no_session;
1284 }
5312a3ed
JG		 1285 memcpy(&stream_info, payload->data, sizeof(stream_info));
1286 stream_info.stream_id = be64toh(stream_info.stream_id);
1287 stream_info.last_net_seq_num = be64toh(stream_info.last_net_seq_num);
173af62f 1288
5312a3ed 1289 stream = stream_get_by_id(stream_info.stream_id);
173af62f
DG		 1290 if (!stream) {
1291 ret = -1;
7591bab1 1292 goto end;
173af62f 1293 }
77f7bd85
MD		 1294
1295 /*
1296 * Set last_net_seq_num before the close flag. Required by data
1297 * pending check.
1298 */
7591bab1 1299 pthread_mutex_lock(&stream->lock);
5312a3ed 1300 stream->last_net_seq_num = stream_info.last_net_seq_num;
77f7bd85
MD		 1301 pthread_mutex_unlock(&stream->lock);
1302
bda7c7b9
JG		 1303 /*
1304 * This is one of the conditions which may trigger a stream close
1305 * with the others being:
1306 * 1) A close command is received for a stream
1307 * 2) The control connection owning the stream is closed
1308 * 3) We have received all of the stream's data _after_ a close
1309 * request.
1310 */
1311 try_stream_close(stream);
7591bab1
MD		 1312 if (stream->is_metadata) {
1313 struct relay_viewer_stream *vstream;
173af62f 1314
7591bab1
MD		 1315 vstream = viewer_stream_get_by_id(stream->stream_handle);
1316 if (vstream) {
1317 if (vstream->metadata_sent == stream->metadata_received) {
1318 /*
1319 * Since all the metadata has been sent to the
1320 * viewer and that we have a request to close
1321 * its stream, we can safely teardown the
1322 * corresponding metadata viewer stream.
1323 */
1324 viewer_stream_put(vstream);
1325 }
1326 /* Put local reference. */
1327 viewer_stream_put(vstream);
1328 }
1329 }
7591bab1 1330 stream_put(stream);
5312a3ed 1331 ret = 0;
173af62f 1332
7591bab1 1333end:
53efb85a 1334 memset(&reply, 0, sizeof(reply));
173af62f 1335 if (ret < 0) {
f73fabfd 1336 reply.ret_code = htobe32(LTTNG_ERR_UNK);
173af62f 1337 } else {
f73fabfd 1338 reply.ret_code = htobe32(LTTNG_OK);
173af62f 1339 }
58eb9381 1340 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
173af62f 1341 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 1342 if (send_ret < (ssize_t) sizeof(reply)) {
1343 ERR("Failed to send \"close stream\" command reply (ret = %zd)",
1344 send_ret);
1345 ret = -1;
173af62f
DG		 1346 }
1347
1348end_no_session:
1349 return ret;
1350}
1351
93ec662e
JD		 1352/*
1353 * relay_reset_metadata: reset a metadata stream
1354 */
1355static
5312a3ed
JG		 1356int relay_reset_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1357 struct relay_connection *conn,
1358 const struct lttng_buffer_view *payload)
93ec662e 1359{
5312a3ed
JG		 1360 int ret;
1361 ssize_t send_ret;
93ec662e
JD		 1362 struct relay_session *session = conn->session;
1363 struct lttcomm_relayd_reset_metadata stream_info;
1364 struct lttcomm_relayd_generic_reply reply;
1365 struct relay_stream *stream;
1366
1367 DBG("Reset metadata received");
1368
5312a3ed 1369 if (!session || !conn->version_check_done) {
93ec662e
JD		 1370 ERR("Trying to reset a metadata stream before version check");
1371 ret = -1;
1372 goto end_no_session;
1373 }
1374
5312a3ed
JG		 1375 if (payload->size < sizeof(stream_info)) {
1376 ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
1377 sizeof(stream_info), payload->size);
93ec662e
JD		 1378 ret = -1;
1379 goto end_no_session;
1380 }
5312a3ed
JG		 1381 memcpy(&stream_info, payload->data, sizeof(stream_info));
1382 stream_info.stream_id = be64toh(stream_info.stream_id);
1383 stream_info.version = be64toh(stream_info.version);
1384
1385 DBG("Update metadata to version %" PRIu64, stream_info.version);
93ec662e
JD		 1386
1387 /* Unsupported for live sessions for now. */
1388 if (session->live_timer != 0) {
1389 ret = -1;
1390 goto end;
1391 }
1392
5312a3ed 1393 stream = stream_get_by_id(stream_info.stream_id);
93ec662e
JD		 1394 if (!stream) {
1395 ret = -1;
1396 goto end;
1397 }
1398 pthread_mutex_lock(&stream->lock);
1399 if (!stream->is_metadata) {
1400 ret = -1;
1401 goto end_unlock;
1402 }
1403
1404 ret = utils_rotate_stream_file(stream->path_name, stream->channel_name,
1405 0, 0, -1, -1, stream->stream_fd->fd, NULL,
1406 &stream->stream_fd->fd);
1407 if (ret < 0) {
1408 ERR("Failed to rotate metadata file %s of channel %s",
1409 stream->path_name, stream->channel_name);
1410 goto end_unlock;
1411 }
1412
1413end_unlock:
1414 pthread_mutex_unlock(&stream->lock);
1415 stream_put(stream);
1416
1417end:
1418 memset(&reply, 0, sizeof(reply));
1419 if (ret < 0) {
1420 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1421 } else {
1422 reply.ret_code = htobe32(LTTNG_OK);
1423 }
1424 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1425 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 1426 if (send_ret < (ssize_t) sizeof(reply)) {
1427 ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
1428 send_ret);
1429 ret = -1;
93ec662e
JD		 1430 }
1431
1432end_no_session:
1433 return ret;
1434}
1435
b8aa1682
JD		 1436/*
1437 * relay_unknown_command: send -1 if received unknown command
1438 */
7591bab1 1439static void relay_unknown_command(struct relay_connection *conn)
b8aa1682
JD		 1440{
1441 struct lttcomm_relayd_generic_reply reply;
5312a3ed 1442 ssize_t send_ret;
b8aa1682 1443
53efb85a 1444 memset(&reply, 0, sizeof(reply));
f73fabfd 1445 reply.ret_code = htobe32(LTTNG_ERR_UNK);
5312a3ed
JG		 1446 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1447 if (send_ret < sizeof(reply)) {
1448 ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret);
b8aa1682
JD		 1449 }
1450}
1451
1452/*
1453 * relay_start: send an acknowledgment to the client to tell if we are
1454 * ready to receive data. We are ready if a session is established.
1455 */
5312a3ed
JG		 1456static int relay_start(const struct lttcomm_relayd_hdr *recv_hdr,
1457 struct relay_connection *conn,
1458 const struct lttng_buffer_view *payload)
b8aa1682 1459{
5312a3ed
JG		 1460 int ret = 0;
1461 ssize_t send_ret;
b8aa1682 1462 struct lttcomm_relayd_generic_reply reply;
58eb9381 1463 struct relay_session *session = conn->session;
b8aa1682
JD		 1464
1465 if (!session) {
1466 DBG("Trying to start the streaming without a session established");
f73fabfd 1467 ret = htobe32(LTTNG_ERR_UNK);
b8aa1682
JD		 1468 }
1469
53efb85a 1470 memset(&reply, 0, sizeof(reply));
5312a3ed
JG		 1471 reply.ret_code = htobe32(LTTNG_OK);
1472 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1473 sizeof(reply), 0);
1474 if (send_ret < (ssize_t) sizeof(reply)) {
1475 ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
1476 send_ret);
1477 ret = -1;
b8aa1682
JD		 1478 }
1479
1480 return ret;
1481}
1482
1d4dfdef
DG		 1483/*
1484 * Append padding to the file pointed by the file descriptor fd.
1485 */
1486static int write_padding_to_file(int fd, uint32_t size)
1487{
6cd525e8 1488 ssize_t ret = 0;
1d4dfdef
DG		 1489 char *zeros;
1490
1491 if (size == 0) {
1492 goto end;
1493 }
1494
1495 zeros = zmalloc(size);
1496 if (zeros == NULL) {
1497 PERROR("zmalloc zeros for padding");
1498 ret = -1;
1499 goto end;
1500 }
1501
6cd525e8
MD		 1502 ret = lttng_write(fd, zeros, size);
1503 if (ret < size) {
1d4dfdef
DG		 1504 PERROR("write padding to file");
1505 }
1506
e986c7a1
DG		 1507 free(zeros);
1508
1d4dfdef
DG		 1509end:
1510 return ret;
1511}
1512
d3ecc550
JD		 1513/*
1514 * Close the current index file if it is open, and create a new one.
1515 *
1516 * Return 0 on success, -1 on error.
1517 */
1518static
1519int create_rotate_index_file(struct relay_stream *stream)
1520{
1521 int ret;
1522 uint32_t major, minor;
1523
1524 /* Put ref on previous index_file. */
1525 if (stream->index_file) {
1526 lttng_index_file_put(stream->index_file);
1527 stream->index_file = NULL;
1528 }
1529 major = stream->trace->session->major;
1530 minor = stream->trace->session->minor;
1531 stream->index_file = lttng_index_file_create(stream->path_name,
1532 stream->channel_name,
1533 -1, -1, stream->tracefile_size,
1534 tracefile_array_get_file_index_head(stream->tfa),
1535 lttng_to_index_major(major, minor),
1536 lttng_to_index_minor(major, minor));
1537 if (!stream->index_file) {
1538 ret = -1;
1539 goto end;
1540 }
1541
1542 ret = 0;
1543
1544end:
1545 return ret;
1546}
1547
1548static
1549int do_rotate_stream(struct relay_stream *stream)
1550{
1551 int ret;
1552
1553 /* Perform the stream rotation. */
1554 ret = utils_rotate_stream_file(stream->path_name,
1555 stream->channel_name, stream->tracefile_size,
1556 stream->tracefile_count, -1,
1557 -1, stream->stream_fd->fd,
1558 NULL, &stream->stream_fd->fd);
1559 if (ret < 0) {
1560 ERR("Rotating stream output file");
1561 goto end;
1562 }
1563 stream->tracefile_size_current = 0;
1564
1565 /* Rotate also the index if the stream is not a metadata stream. */
1566 if (!stream->is_metadata) {
1567 ret = create_rotate_index_file(stream);
1568 if (ret < 0) {
1569 ERR("Failed to rotate index file");
1570 goto end;
1571 }
1572 }
1573
1574 stream->rotate_at_seq_num = -1ULL;
1575 stream->pos_after_last_complete_data_index = 0;
1576
1577end:
1578 return ret;
1579}
1580
1581/*
1582 * If too much data has been written in a tracefile before we received the
1583 * rotation command, we have to move the excess data to the new tracefile and
1584 * perform the rotation. This can happen because the control and data
1585 * connections are separate, the indexes as well as the commands arrive from
1586 * the control connection and we have no control over the order so we could be
1587 * in a situation where too much data has been received on the data connection
1588 * before the rotation command on the control connection arrives. We don't need
1589 * to update the index because its order is guaranteed with the rotation
1590 * command message.
1591 */
1592static
1593int rotate_truncate_stream(struct relay_stream *stream)
1594{
1595 int ret, new_fd;
a5df8828 1596 off_t lseek_ret;
d3ecc550
JD		 1597 uint64_t diff, pos = 0;
1598 char buf[FILE_COPY_BUFFER_SIZE];
1599
1600 assert(!stream->is_metadata);
1601
1602 assert(stream->tracefile_size_current >
1603 stream->pos_after_last_complete_data_index);
1604 diff = stream->tracefile_size_current -
1605 stream->pos_after_last_complete_data_index;
1606
1607 /* Create the new tracefile. */
1608 new_fd = utils_create_stream_file(stream->path_name,
1609 stream->channel_name,
1610 stream->tracefile_size, stream->tracefile_count,
1611 /* uid */ -1, /* gid */ -1, /* suffix */ NULL);
1612 if (new_fd < 0) {
1613 ERR("Failed to create new stream file at path %s for channel %s",
1614 stream->path_name, stream->channel_name);
1615 ret = -1;
1616 goto end;
1617 }
1618
1619 /*
1620 * Rewind the current tracefile to the position at which the rotation
1621 * should have occured.
1622 */
a5df8828 1623 lseek_ret = lseek(stream->stream_fd->fd,
d3ecc550 1624 stream->pos_after_last_complete_data_index, SEEK_SET);
a5df8828 1625 if (lseek_ret < 0) {
d3ecc550 1626 PERROR("seek truncate stream");
a5df8828 1627 ret = -1;
d3ecc550
JD		 1628 goto end;
1629 }
1630
1631 /* Move data from the old file to the new file. */
1632 while (pos < diff) {
1633 uint64_t count, bytes_left;
1634 ssize_t io_ret;
1635
1636 bytes_left = diff - pos;
1637 count = bytes_left > sizeof(buf) ? sizeof(buf) : bytes_left;
1638 assert(count <= SIZE_MAX);
1639
1640 io_ret = lttng_read(stream->stream_fd->fd, buf, count);
1641 if (io_ret < (ssize_t) count) {
1642 char error_string[256];
1643
1644 snprintf(error_string, sizeof(error_string),
1645 "Failed to read %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1646 count, stream->stream_fd->fd, io_ret);
1647 if (io_ret == -1) {
1648 PERROR("%s", error_string);
1649 } else {
1650 ERR("%s", error_string);
1651 }
1652 ret = -1;
1653 goto end;
1654 }
1655
1656 io_ret = lttng_write(new_fd, buf, count);
1657 if (io_ret < (ssize_t) count) {
1658 char error_string[256];
1659
1660 snprintf(error_string, sizeof(error_string),
1661 "Failed to write %" PRIu64 " bytes from fd %i in rotate_truncate_stream(), returned %zi",
1662 count, new_fd, io_ret);
1663 if (io_ret == -1) {
1664 PERROR("%s", error_string);
1665 } else {
1666 ERR("%s", error_string);
1667 }
1668 ret = -1;
1669 goto end;
1670 }
1671
1672 pos += count;
1673 }
1674
1675 /* Truncate the file to get rid of the excess data. */
1676 ret = ftruncate(stream->stream_fd->fd,
1677 stream->pos_after_last_complete_data_index);
1678 if (ret) {
1679 PERROR("ftruncate");
1680 goto end;
1681 }
1682
1683 ret = close(stream->stream_fd->fd);
1684 if (ret < 0) {
1685 PERROR("Closing tracefile");
1686 goto end;
1687 }
1688
1689 ret = create_rotate_index_file(stream);
1690 if (ret < 0) {
1691 ERR("Rotate stream index file");
1692 goto end;
1693 }
1694
1695 /*
1696 * Update the offset and FD of all the eventual indexes created by the
1697 * data connection before the rotation command arrived.
1698 */
1699 ret = relay_index_switch_all_files(stream);
1700 if (ret < 0) {
1701 ERR("Failed to rotate index file");
1702 goto end;
1703 }
1704
1705 stream->stream_fd->fd = new_fd;
1706 stream->tracefile_size_current = diff;
1707 stream->pos_after_last_complete_data_index = 0;
1708 stream->rotate_at_seq_num = -1ULL;
1709
1710 ret = 0;
1711
1712end:
1713 return ret;
1714}
1715
1716/*
1717 * Check if a stream should perform a rotation (for session rotation).
1718 * Must be called with the stream lock held.
1719 *
1720 * Return 0 on success, a negative value on error.
1721 */
1722static
1723int try_rotate_stream(struct relay_stream *stream)
1724{
1725 int ret = 0;
1726
1727 /* No rotation expected. */
1728 if (stream->rotate_at_seq_num == -1ULL) {
1729 goto end;
1730 }
1731
3765c8cc
JG		 1732 if (stream->prev_seq < stream->rotate_at_seq_num ||
1733 stream->prev_seq == -1ULL) {
d3ecc550
JD		 1734 DBG("Stream %" PRIu64 " no yet ready for rotation",
1735 stream->stream_handle);
1736 goto end;
1737 } else if (stream->prev_seq > stream->rotate_at_seq_num) {
1738 DBG("Rotation after too much data has been written in tracefile "
1739 "for stream %" PRIu64 ", need to truncate before "
1740 "rotating", stream->stream_handle);
1741 ret = rotate_truncate_stream(stream);
1742 if (ret) {
1743 ERR("Failed to truncate stream");
1744 goto end;
1745 }
1746 } else {
1747 /* stream->prev_seq == stream->rotate_at_seq_num */
1748 DBG("Stream %" PRIu64 " ready for rotation",
1749 stream->stream_handle);
1750 ret = do_rotate_stream(stream);
1751 }
1752
1753end:
1754 return ret;
1755}
1756
b8aa1682 1757/*
7591bab1 1758 * relay_recv_metadata: receive the metadata for the session.
b8aa1682 1759 */
5312a3ed
JG		 1760static int relay_recv_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1761 struct relay_connection *conn,
1762 const struct lttng_buffer_view *payload)
b8aa1682 1763{
32d1569c 1764 int ret = 0;
6cd525e8 1765 ssize_t size_ret;
58eb9381 1766 struct relay_session *session = conn->session;
5312a3ed 1767 struct lttcomm_relayd_metadata_payload metadata_payload_header;
b8aa1682 1768 struct relay_stream *metadata_stream;
5312a3ed 1769 uint64_t metadata_payload_size;
b8aa1682
JD		 1770
1771 if (!session) {
1772 ERR("Metadata sent before version check");
1773 ret = -1;
1774 goto end;
1775 }
1776
5312a3ed 1777 if (recv_hdr->data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
f6416125
MD		 1778 ERR("Incorrect data size");
1779 ret = -1;
1780 goto end;
1781 }
5312a3ed
JG		 1782 metadata_payload_size = recv_hdr->data_size -
1783 sizeof(struct lttcomm_relayd_metadata_payload);
f6416125 1784
5312a3ed
JG		 1785 memcpy(&metadata_payload_header, payload->data,
1786 sizeof(metadata_payload_header));
1787 metadata_payload_header.stream_id = be64toh(
1788 metadata_payload_header.stream_id);
1789 metadata_payload_header.padding_size = be32toh(
1790 metadata_payload_header.padding_size);
9d1bbf21 1791
5312a3ed 1792 metadata_stream = stream_get_by_id(metadata_payload_header.stream_id);
b8aa1682
JD		 1793 if (!metadata_stream) {
1794 ret = -1;
7591bab1 1795 goto end;
b8aa1682
JD		 1796 }
1797
7591bab1
MD		 1798 pthread_mutex_lock(&metadata_stream->lock);
1799
5312a3ed
JG		 1800 size_ret = lttng_write(metadata_stream->stream_fd->fd,
1801 payload->data + sizeof(metadata_payload_header),
1802 metadata_payload_size);
1803 if (size_ret < metadata_payload_size) {
b8aa1682
JD		 1804 ERR("Relay error writing metadata on file");
1805 ret = -1;
7591bab1 1806 goto end_put;
b8aa1682 1807 }
1d4dfdef 1808
32d1569c 1809 size_ret = write_padding_to_file(metadata_stream->stream_fd->fd,
5312a3ed 1810 metadata_payload_header.padding_size);
715e6fb1 1811 if (size_ret < (int64_t) metadata_payload_header.padding_size) {
5312a3ed 1812 ret = -1;
7591bab1 1813 goto end_put;
1d4dfdef 1814 }
2a174661 1815
7591bab1 1816 metadata_stream->metadata_received +=
5312a3ed 1817 metadata_payload_size + metadata_payload_header.padding_size;
7591bab1
MD		 1818 DBG2("Relay metadata written. Updated metadata_received %" PRIu64,
1819 metadata_stream->metadata_received);
1d4dfdef 1820
d3ecc550
JD		 1821 ret = try_rotate_stream(metadata_stream);
1822 if (ret < 0) {
1823 goto end_put;
1824 }
1825
7591bab1
MD		 1826end_put:
1827 pthread_mutex_unlock(&metadata_stream->lock);
1828 stream_put(metadata_stream);
b8aa1682
JD		 1829end:
1830 return ret;
1831}
1832
1833/*
1834 * relay_send_version: send relayd version number
1835 */
5312a3ed
JG		 1836static int relay_send_version(const struct lttcomm_relayd_hdr *recv_hdr,
1837 struct relay_connection *conn,
1838 const struct lttng_buffer_view *payload)
b8aa1682 1839{
7f51dcba 1840 int ret;
5312a3ed 1841 ssize_t send_ret;
092b6259 1842 struct lttcomm_relayd_version reply, msg;
87cb6359 1843 bool compatible = true;
b8aa1682 1844
5312a3ed 1845 conn->version_check_done = true;
b8aa1682 1846
092b6259 1847 /* Get version from the other side. */
5312a3ed
JG		 1848 if (payload->size < sizeof(msg)) {
1849 ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
1850 sizeof(msg), payload->size);
092b6259 1851 ret = -1;
092b6259
DG		 1852 goto end;
1853 }
1854
5312a3ed
JG		 1855 memcpy(&msg, payload->data, sizeof(msg));
1856 msg.major = be32toh(msg.major);
1857 msg.minor = be32toh(msg.minor);
1858
53efb85a 1859 memset(&reply, 0, sizeof(reply));
d83a952c
MD		 1860 reply.major = RELAYD_VERSION_COMM_MAJOR;
1861 reply.minor = RELAYD_VERSION_COMM_MINOR;
d4519fa3
JD		 1862
1863 /* Major versions must be the same */
5312a3ed 1864 if (reply.major != msg.major) {
6151a90f 1865 DBG("Incompatible major versions (%u vs %u), deleting session",
5312a3ed 1866 reply.major, msg.major);
87cb6359 1867 compatible = false;
d4519fa3
JD		 1868 }
1869
58eb9381 1870 conn->major = reply.major;
0f907de1 1871 /* We adapt to the lowest compatible version */
5312a3ed 1872 if (reply.minor <= msg.minor) {
58eb9381 1873 conn->minor = reply.minor;
0f907de1 1874 } else {
5312a3ed 1875 conn->minor = msg.minor;
0f907de1
JD		 1876 }
1877
6151a90f
JD		 1878 reply.major = htobe32(reply.major);
1879 reply.minor = htobe32(reply.minor);
5312a3ed
JG		 1880 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1881 sizeof(reply), 0);
1882 if (send_ret < (ssize_t) sizeof(reply)) {
1883 ERR("Failed to send \"send version\" command reply (ret = %zd)",
1884 send_ret);
1885 ret = -1;
1886 goto end;
1887 } else {
1888 ret = 0;
6151a90f
JD		 1889 }
1890
87cb6359
JD		 1891 if (!compatible) {
1892 ret = -1;
1893 goto end;
1894 }
1895
58eb9381
DG		 1896 DBG("Version check done using protocol %u.%u", conn->major,
1897 conn->minor);
b8aa1682
JD		 1898
1899end:
1900 return ret;
1901}
1902
c8f59ee5 1903/*
6d805429 1904 * Check for data pending for a given stream id from the session daemon.
c8f59ee5 1905 */
5312a3ed
JG		 1906static int relay_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
1907 struct relay_connection *conn,
1908 const struct lttng_buffer_view *payload)
c8f59ee5 1909{
58eb9381 1910 struct relay_session *session = conn->session;
6d805429 1911 struct lttcomm_relayd_data_pending msg;
c8f59ee5
DG		 1912 struct lttcomm_relayd_generic_reply reply;
1913 struct relay_stream *stream;
5312a3ed 1914 ssize_t send_ret;
c8f59ee5 1915 int ret;
c8f59ee5 1916
6d805429 1917 DBG("Data pending command received");
c8f59ee5 1918
5312a3ed 1919 if (!session || !conn->version_check_done) {
c8f59ee5
DG		 1920 ERR("Trying to check for data before version check");
1921 ret = -1;
1922 goto end_no_session;
1923 }
1924
5312a3ed
JG		 1925 if (payload->size < sizeof(msg)) {
1926 ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
1927 sizeof(msg), payload->size);
c8f59ee5
DG		 1928 ret = -1;
1929 goto end_no_session;
1930 }
5312a3ed
JG		 1931 memcpy(&msg, payload->data, sizeof(msg));
1932 msg.stream_id = be64toh(msg.stream_id);
1933 msg.last_net_seq_num = be64toh(msg.last_net_seq_num);
c8f59ee5 1934
5312a3ed 1935 stream = stream_get_by_id(msg.stream_id);
de91f48a 1936 if (stream == NULL) {
c8f59ee5 1937 ret = -1;
7591bab1 1938 goto end;
c8f59ee5
DG		 1939 }
1940
7591bab1
MD		 1941 pthread_mutex_lock(&stream->lock);
1942
6d805429 1943 DBG("Data pending for stream id %" PRIu64 " prev_seq %" PRIu64
5312a3ed
JG		 1944 " and last_seq %" PRIu64, msg.stream_id,
1945 stream->prev_seq, msg.last_net_seq_num);
c8f59ee5 1946
33832e64 1947 /* Avoid wrapping issue */
5312a3ed 1948 if (((int64_t) (stream->prev_seq - msg.last_net_seq_num)) >= 0) {
6d805429 1949 /* Data has in fact been written and is NOT pending */
c8f59ee5 1950 ret = 0;
6d805429
DG		 1951 } else {
1952 /* Data still being streamed thus pending */
1953 ret = 1;
c8f59ee5
DG		 1954 }
1955
7591bab1
MD		 1956 stream->data_pending_check_done = true;
1957 pthread_mutex_unlock(&stream->lock);
f7079f67 1958
7591bab1
MD		 1959 stream_put(stream);
1960end:
c8f59ee5 1961
53efb85a 1962 memset(&reply, 0, sizeof(reply));
c8f59ee5 1963 reply.ret_code = htobe32(ret);
5312a3ed
JG		 1964 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1965 if (send_ret < (ssize_t) sizeof(reply)) {
1966 ERR("Failed to send \"data pending\" command reply (ret = %zd)",
1967 send_ret);
1968 ret = -1;
c8f59ee5
DG		 1969 }
1970
1971end_no_session:
1972 return ret;
1973}
1974
1975/*
1976 * Wait for the control socket to reach a quiescent state.
1977 *
7591bab1
MD		 1978 * Note that for now, when receiving this command from the session
1979 * daemon, this means that every subsequent commands or data received on
1980 * the control socket has been handled. So, this is why we simply return
1981 * OK here.
c8f59ee5 1982 */
5312a3ed
JG		 1983static int relay_quiescent_control(const struct lttcomm_relayd_hdr *recv_hdr,
1984 struct relay_connection *conn,
1985 const struct lttng_buffer_view *payload)
c8f59ee5
DG		 1986{
1987 int ret;
5312a3ed 1988 ssize_t send_ret;
ad7051c0 1989 struct relay_stream *stream;
ad7051c0 1990 struct lttcomm_relayd_quiescent_control msg;
c8f59ee5
DG		 1991 struct lttcomm_relayd_generic_reply reply;
1992
1993 DBG("Checking quiescent state on control socket");
1994
5312a3ed 1995 if (!conn->session || !conn->version_check_done) {
ad7051c0
DG		 1996 ERR("Trying to check for data before version check");
1997 ret = -1;
1998 goto end_no_session;
1999 }
2000
5312a3ed
JG		 2001 if (payload->size < sizeof(msg)) {
2002 ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
2003 sizeof(msg), payload->size);
ad7051c0
DG		 2004 ret = -1;
2005 goto end_no_session;
2006 }
5312a3ed
JG		 2007 memcpy(&msg, payload->data, sizeof(msg));
2008 msg.stream_id = be64toh(msg.stream_id);
ad7051c0 2009
5312a3ed 2010 stream = stream_get_by_id(msg.stream_id);
7591bab1
MD		 2011 if (!stream) {
2012 goto reply;
2013 }
2014 pthread_mutex_lock(&stream->lock);
2015 stream->data_pending_check_done = true;
2016 pthread_mutex_unlock(&stream->lock);
5312a3ed
JG		 2017
2018 DBG("Relay quiescent control pending flag set to %" PRIu64, msg.stream_id);
7591bab1
MD		 2019 stream_put(stream);
2020reply:
53efb85a 2021 memset(&reply, 0, sizeof(reply));
c8f59ee5 2022 reply.ret_code = htobe32(LTTNG_OK);
5312a3ed
JG		 2023 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2024 if (send_ret < (ssize_t) sizeof(reply)) {
2025 ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
2026 send_ret);
2027 ret = -1;
2028 } else {
2029 ret = 0;
c8f59ee5
DG		 2030 }
2031
ad7051c0 2032end_no_session:
c8f59ee5
DG		 2033 return ret;
2034}
2035
f7079f67 2036/*
7591bab1
MD		 2037 * Initialize a data pending command. This means that a consumer is about
2038 * to ask for data pending for each stream it holds. Simply iterate over
2039 * all streams of a session and set the data_pending_check_done flag.
f7079f67
DG		 2040 *
2041 * This command returns to the client a LTTNG_OK code.
2042 */
5312a3ed
JG		 2043static int relay_begin_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2044 struct relay_connection *conn,
2045 const struct lttng_buffer_view *payload)
f7079f67
DG		 2046{
2047 int ret;
5312a3ed 2048 ssize_t send_ret;
f7079f67
DG		 2049 struct lttng_ht_iter iter;
2050 struct lttcomm_relayd_begin_data_pending msg;
2051 struct lttcomm_relayd_generic_reply reply;
2052 struct relay_stream *stream;
f7079f67
DG		 2053
2054 assert(recv_hdr);
58eb9381 2055 assert(conn);
f7079f67
DG		 2056
2057 DBG("Init streams for data pending");
2058
5312a3ed 2059 if (!conn->session || !conn->version_check_done) {
f7079f67
DG		 2060 ERR("Trying to check for data before version check");
2061 ret = -1;
2062 goto end_no_session;
2063 }
2064
5312a3ed
JG		 2065 if (payload->size < sizeof(msg)) {
2066 ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
2067 sizeof(msg), payload->size);
f7079f67
DG		 2068 ret = -1;
2069 goto end_no_session;
2070 }
5312a3ed
JG		 2071 memcpy(&msg, payload->data, sizeof(msg));
2072 msg.session_id = be64toh(msg.session_id);
f7079f67
DG		 2073
2074 /*
7591bab1
MD		 2075 * Iterate over all streams to set the begin data pending flag.
2076 * For now, the streams are indexed by stream handle so we have
2077 * to iterate over all streams to find the one associated with
2078 * the right session_id.
f7079f67
DG		 2079 */
2080 rcu_read_lock();
d3e2ba59 2081 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2082 node.node) {
7591bab1
MD		 2083 if (!stream_get(stream)) {
2084 continue;
2085 }
5312a3ed 2086 if (stream->trace->session->id == msg.session_id) {
7591bab1
MD		 2087 pthread_mutex_lock(&stream->lock);
2088 stream->data_pending_check_done = false;
2089 pthread_mutex_unlock(&stream->lock);
f7079f67
DG		 2090 DBG("Set begin data pending flag to stream %" PRIu64,
2091 stream->stream_handle);
2092 }
7591bab1 2093 stream_put(stream);
f7079f67
DG		 2094 }
2095 rcu_read_unlock();
2096
53efb85a 2097 memset(&reply, 0, sizeof(reply));
f7079f67
DG		 2098 /* All good, send back reply. */
2099 reply.ret_code = htobe32(LTTNG_OK);
2100
5312a3ed
JG		 2101 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2102 if (send_ret < (ssize_t) sizeof(reply)) {
2103 ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
2104 send_ret);
2105 ret = -1;
2106 } else {
2107 ret = 0;
f7079f67
DG		 2108 }
2109
2110end_no_session:
2111 return ret;
2112}
2113
2114/*
7591bab1
MD		 2115 * End data pending command. This will check, for a given session id, if
2116 * each stream associated with it has its data_pending_check_done flag
2117 * set. If not, this means that the client lost track of the stream but
2118 * the data is still being streamed on our side. In this case, we inform
2119 * the client that data is in flight.
f7079f67
DG		 2120 *
2121 * Return to the client if there is data in flight or not with a ret_code.
2122 */
5312a3ed
JG		 2123static int relay_end_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2124 struct relay_connection *conn,
2125 const struct lttng_buffer_view *payload)
f7079f67
DG		 2126{
2127 int ret;
5312a3ed 2128 ssize_t send_ret;
f7079f67
DG		 2129 struct lttng_ht_iter iter;
2130 struct lttcomm_relayd_end_data_pending msg;
2131 struct lttcomm_relayd_generic_reply reply;
2132 struct relay_stream *stream;
f7079f67
DG		 2133 uint32_t is_data_inflight = 0;
2134
f7079f67
DG		 2135 DBG("End data pending command");
2136
5312a3ed 2137 if (!conn->session || !conn->version_check_done) {
f7079f67
DG		 2138 ERR("Trying to check for data before version check");
2139 ret = -1;
2140 goto end_no_session;
2141 }
2142
5312a3ed
JG		 2143 if (payload->size < sizeof(msg)) {
2144 ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
2145 sizeof(msg), payload->size);
f7079f67
DG		 2146 ret = -1;
2147 goto end_no_session;
2148 }
5312a3ed
JG		 2149 memcpy(&msg, payload->data, sizeof(msg));
2150 msg.session_id = be64toh(msg.session_id);
f7079f67 2151
7591bab1
MD		 2152 /*
2153 * Iterate over all streams to see if the begin data pending
2154 * flag is set.
2155 */
f7079f67 2156 rcu_read_lock();
d3e2ba59 2157 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2158 node.node) {
7591bab1
MD		 2159 if (!stream_get(stream)) {
2160 continue;
2161 }
5312a3ed 2162 if (stream->trace->session->id != msg.session_id) {
7591bab1
MD		 2163 stream_put(stream);
2164 continue;
2165 }
2166 pthread_mutex_lock(&stream->lock);
2167 if (!stream->data_pending_check_done) {
2168 if (!stream->closed || !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) {
2169 is_data_inflight = 1;
2170 DBG("Data is still in flight for stream %" PRIu64,
2171 stream->stream_handle);
2172 pthread_mutex_unlock(&stream->lock);
2173 stream_put(stream);
2174 break;
2175 }
f7079f67 2176 }
7591bab1
MD		 2177 pthread_mutex_unlock(&stream->lock);
2178 stream_put(stream);
f7079f67
DG		 2179 }
2180 rcu_read_unlock();
2181
53efb85a 2182 memset(&reply, 0, sizeof(reply));
f7079f67
DG		 2183 /* All good, send back reply. */
2184 reply.ret_code = htobe32(is_data_inflight);
2185
5312a3ed
JG		 2186 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2187 if (send_ret < (ssize_t) sizeof(reply)) {
2188 ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
2189 send_ret);
2190 ret = -1;
2191 } else {
2192 ret = 0;
f7079f67
DG		 2193 }
2194
2195end_no_session:
2196 return ret;
2197}
2198
1c20f0e2
JD		 2199/*
2200 * Receive an index for a specific stream.
2201 *
2202 * Return 0 on success else a negative value.
2203 */
5312a3ed
JG		 2204static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
2205 struct relay_connection *conn,
2206 const struct lttng_buffer_view *payload)
1c20f0e2 2207{
5312a3ed
JG		 2208 int ret;
2209 ssize_t send_ret;
58eb9381 2210 struct relay_session *session = conn->session;
1c20f0e2 2211 struct lttcomm_relayd_index index_info;
7591bab1 2212 struct relay_index *index;
1c20f0e2
JD		 2213 struct lttcomm_relayd_generic_reply reply;
2214 struct relay_stream *stream;
f8f3885c 2215 size_t msg_len;
1c20f0e2 2216
58eb9381 2217 assert(conn);
1c20f0e2
JD		 2218
2219 DBG("Relay receiving index");
2220
5312a3ed 2221 if (!session || !conn->version_check_done) {
1c20f0e2
JD		 2222 ERR("Trying to close a stream before version check");
2223 ret = -1;
2224 goto end_no_session;
2225 }
2226
f8f3885c
MD		 2227 msg_len = lttcomm_relayd_index_len(
2228 lttng_to_index_major(conn->major, conn->minor),
2229 lttng_to_index_minor(conn->major, conn->minor));
5312a3ed
JG		 2230 if (payload->size < msg_len) {
2231 ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
2232 msg_len, payload->size);
1c20f0e2
JD		 2233 ret = -1;
2234 goto end_no_session;
2235 }
5312a3ed
JG		 2236 memcpy(&index_info, payload->data, msg_len);
2237 index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
2238 index_info.net_seq_num = be64toh(index_info.net_seq_num);
2239 index_info.packet_size = be64toh(index_info.packet_size);
2240 index_info.content_size = be64toh(index_info.content_size);
2241 index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
2242 index_info.timestamp_end = be64toh(index_info.timestamp_end);
2243 index_info.events_discarded = be64toh(index_info.events_discarded);
2244 index_info.stream_id = be64toh(index_info.stream_id);
2245 index_info.stream_instance_id = be64toh(index_info.stream_instance_id);
2246 index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
2247
2248 stream = stream_get_by_id(index_info.relay_stream_id);
1c20f0e2 2249 if (!stream) {
7591bab1 2250 ERR("stream_get_by_id not found");
1c20f0e2 2251 ret = -1;
7591bab1 2252 goto end;
1c20f0e2 2253 }
7591bab1 2254 pthread_mutex_lock(&stream->lock);
1c20f0e2 2255
d3e2ba59
JD		 2256 /* Live beacon handling */
2257 if (index_info.packet_size == 0) {
7591bab1
MD		 2258 DBG("Received live beacon for stream %" PRIu64,
2259 stream->stream_handle);
d3e2ba59
JD		 2260
2261 /*
7591bab1
MD		 2262 * Only flag a stream inactive when it has already
2263 * received data and no indexes are in flight.
d3e2ba59 2264 */
a44ca2ca 2265 if (stream->index_received_seqcount > 0
7591bab1 2266 && stream->indexes_in_flight == 0) {
5312a3ed 2267 stream->beacon_ts_end = index_info.timestamp_end;
d3e2ba59
JD		 2268 }
2269 ret = 0;
7591bab1 2270 goto end_stream_put;
d3e2ba59
JD		 2271 } else {
2272 stream->beacon_ts_end = -1ULL;
2273 }
2274
528f2ffa 2275 if (stream->ctf_stream_id == -1ULL) {
5312a3ed 2276 stream->ctf_stream_id = index_info.stream_id;
528f2ffa 2277 }
5312a3ed 2278 index = relay_index_get_by_id_or_create(stream, index_info.net_seq_num);
7591bab1
MD		 2279 if (!index) {
2280 ret = -1;
2281 ERR("relay_index_get_by_id_or_create index NULL");
2282 goto end_stream_put;
1c20f0e2 2283 }
234cd636 2284 if (set_index_control_data(index, &index_info, conn)) {
7591bab1
MD		 2285 ERR("set_index_control_data error");
2286 relay_index_put(index);
2287 ret = -1;
2288 goto end_stream_put;
2289 }
2290 ret = relay_index_try_flush(index);
2291 if (ret == 0) {
a44ca2ca
MD		 2292 tracefile_array_commit_seq(stream->tfa);
2293 stream->index_received_seqcount++;
d3ecc550 2294 stream->pos_after_last_complete_data_index += index->total_size;
7591bab1
MD		 2295 } else if (ret > 0) {
2296 /* no flush. */
2297 ret = 0;
2298 } else {
2299 ERR("relay_index_try_flush error %d", ret);
2300 relay_index_put(index);
2301 ret = -1;
1c20f0e2
JD		 2302 }
2303
7591bab1
MD		 2304end_stream_put:
2305 pthread_mutex_unlock(&stream->lock);
2306 stream_put(stream);
2307
2308end:
1c20f0e2 2309
53efb85a 2310 memset(&reply, 0, sizeof(reply));
1c20f0e2
JD		 2311 if (ret < 0) {
2312 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2313 } else {
2314 reply.ret_code = htobe32(LTTNG_OK);
2315 }
58eb9381 2316 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 2317 if (send_ret < (ssize_t) sizeof(reply)) {
2318 ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
2319 ret = -1;
1c20f0e2
JD		 2320 }
2321
2322end_no_session:
2323 return ret;
2324}
2325
a4baae1b
JD		 2326/*
2327 * Receive the streams_sent message.
2328 *
2329 * Return 0 on success else a negative value.
2330 */
5312a3ed
JG		 2331static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
2332 struct relay_connection *conn,
2333 const struct lttng_buffer_view *payload)
a4baae1b 2334{
5312a3ed
JG		 2335 int ret;
2336 ssize_t send_ret;
a4baae1b
JD		 2337 struct lttcomm_relayd_generic_reply reply;
2338
58eb9381 2339 assert(conn);
a4baae1b
JD		 2340
2341 DBG("Relay receiving streams_sent");
2342
5312a3ed 2343 if (!conn->session || !conn->version_check_done) {
a4baae1b
JD		 2344 ERR("Trying to close a stream before version check");
2345 ret = -1;
2346 goto end_no_session;
2347 }
2348
2349 /*
7591bab1
MD		 2350 * Publish every pending stream in the connection recv list which are
2351 * now ready to be used by the viewer.
4a9daf17 2352 */
7591bab1 2353 publish_connection_local_streams(conn);
4a9daf17 2354
53efb85a 2355 memset(&reply, 0, sizeof(reply));
a4baae1b 2356 reply.ret_code = htobe32(LTTNG_OK);
58eb9381 2357 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 2358 if (send_ret < (ssize_t) sizeof(reply)) {
2359 ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
2360 send_ret);
2361 ret = -1;
a4baae1b
JD		 2362 } else {
2363 /* Success. */
2364 ret = 0;
2365 }
2366
2367end_no_session:
2368 return ret;
2369}
2370
d3ecc550 2371/*
5312a3ed 2372 * relay_rotate_session_stream: rotate a stream to a new tracefile for the session
d3ecc550
JD		 2373 * rotation feature (not the tracefile rotation feature).
2374 */
5312a3ed
JG		 2375static int relay_rotate_session_stream(const struct lttcomm_relayd_hdr *recv_hdr,
2376 struct relay_connection *conn,
2377 const struct lttng_buffer_view *payload)
d3ecc550 2378{
5312a3ed
JG		 2379 int ret;
2380 ssize_t send_ret;
d3ecc550
JD		 2381 struct relay_session *session = conn->session;
2382 struct lttcomm_relayd_rotate_stream stream_info;
2383 struct lttcomm_relayd_generic_reply reply;
2384 struct relay_stream *stream;
5312a3ed
JG		 2385 size_t header_len;
2386 size_t path_len;
2387 struct lttng_buffer_view new_path_view;
d3ecc550
JD		 2388
2389 DBG("Rotate stream received");
2390
2391 if (!session || !conn->version_check_done) {
2392 ERR("Trying to rotate a stream before version check");
2393 ret = -1;
2394 goto end_no_reply;
2395 }
2396
2397 if (session->major == 2 && session->minor < 11) {
2398 ERR("Unsupported feature before 2.11");
2399 ret = -1;
2400 goto end_no_reply;
2401 }
2402
5312a3ed 2403 header_len = sizeof(struct lttcomm_relayd_rotate_stream);
d3ecc550 2404
5312a3ed
JG		 2405 if (payload->size < header_len) {
2406 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
2407 header_len, payload->size);
d3ecc550
JD		 2408 ret = -1;
2409 goto end_no_reply;
2410 }
2411
5312a3ed
JG		 2412 memcpy(&stream_info, payload->data, header_len);
2413
2414 /* Convert to host */
2415 stream_info.pathname_length = be32toh(stream_info.pathname_length);
2416 stream_info.stream_id = be64toh(stream_info.stream_id);
2417 stream_info.new_chunk_id = be64toh(stream_info.new_chunk_id);
2418 stream_info.rotate_at_seq_num = be64toh(stream_info.rotate_at_seq_num);
d3ecc550 2419
5312a3ed
JG		 2420 path_len = stream_info.pathname_length;
2421 if (payload->size < header_len + path_len) {
2422 ERR("Unexpected payload size in \"relay_rotate_session_stream\" including path: expected >= %zu bytes, got %zu bytes",
2423 header_len + path_len, payload->size);
2424 ret = -1;
2425 goto end_no_reply;
2426 }
2427
d3ecc550 2428 /* Ensure it fits in local filename length. */
5312a3ed 2429 if (path_len >= LTTNG_PATH_MAX) {
d3ecc550
JD		 2430 ret = -ENAMETOOLONG;
2431 ERR("Length of relay_rotate_session_stream command's path name (%zu bytes) exceeds the maximal allowed length of %i bytes",
5312a3ed 2432 path_len, LTTNG_PATH_MAX);
d3ecc550
JD		 2433 goto end;
2434 }
2435
5312a3ed
JG		 2436 new_path_view = lttng_buffer_view_from_view(payload, header_len,
2437 stream_info.pathname_length);
d3ecc550 2438
5312a3ed
JG		 2439 stream = stream_get_by_id(stream_info.stream_id);
2440 if (!stream) {
d3ecc550 2441 ret = -1;
5312a3ed 2442 goto end;
d3ecc550
JD		 2443 }
2444
2445 pthread_mutex_lock(&stream->lock);
2446
2447 /*
2448 * Update the trace path (just the folder, the stream name does not
2449 * change).
2450 */
2451 free(stream->path_name);
5312a3ed 2452 stream->path_name = create_output_path(new_path_view.data);
d3ecc550
JD		 2453 if (!stream->path_name) {
2454 ERR("Failed to create a new output path");
5312a3ed 2455 ret = -1;
d3ecc550
JD		 2456 goto end_stream_unlock;
2457 }
2458 ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG,
2459 -1, -1);
2460 if (ret < 0) {
2461 ERR("relay creating output directory");
5312a3ed 2462 ret = -1;
d3ecc550
JD		 2463 goto end_stream_unlock;
2464 }
5312a3ed
JG		 2465
2466 stream->chunk_id = stream_info.new_chunk_id;
d3ecc550
JD		 2467
2468 if (stream->is_metadata) {
2469 /*
2470 * The metadata stream is sent only over the control connection
2471 * so we know we have all the data to perform the stream
2472 * rotation.
2473 */
2474 ret = do_rotate_stream(stream);
2475 } else {
5312a3ed 2476 stream->rotate_at_seq_num = stream_info.rotate_at_seq_num;
d3ecc550
JD		 2477 ret = try_rotate_stream(stream);
2478 }
2479 if (ret < 0) {
2480 goto end_stream_unlock;
2481 }
2482
2483end_stream_unlock:
2484 pthread_mutex_unlock(&stream->lock);
2485 stream_put(stream);
2486end:
2487 memset(&reply, 0, sizeof(reply));
2488 if (ret < 0) {
2489 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2490 } else {
2491 reply.ret_code = htobe32(LTTNG_OK);
2492 }
2493 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2494 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 2495 if (send_ret < (ssize_t) sizeof(reply)) {
2496 ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
2497 send_ret);
2498 ret = -1;
d3ecc550
JD		 2499 }
2500
2501end_no_reply:
d3ecc550
JD		 2502 return ret;
2503}
2504
a1ae2ea5
JD		 2505/*
2506 * relay_mkdir: Create a folder on the disk.
2507 */
5312a3ed
JG		 2508static int relay_mkdir(const struct lttcomm_relayd_hdr *recv_hdr,
2509 struct relay_connection *conn,
2510 const struct lttng_buffer_view *payload)
a1ae2ea5
JD		 2511{
2512 int ret;
a1ae2ea5
JD		 2513 struct relay_session *session = conn->session;
2514 struct lttcomm_relayd_mkdir path_info_header;
a1ae2ea5
JD		 2515 struct lttcomm_relayd_generic_reply reply;
2516 char *path = NULL;
5312a3ed
JG		 2517 size_t header_len;
2518 ssize_t send_ret;
2519 struct lttng_buffer_view path_view;
a1ae2ea5
JD		 2520
2521 if (!session || !conn->version_check_done) {
00fb02ac 2522 ERR("Trying to create a directory before version check");
a1ae2ea5
JD		 2523 ret = -1;
2524 goto end_no_session;
2525 }
2526
2527 if (session->major == 2 && session->minor < 11) {
2528 /*
2529 * This client is not supposed to use this command since
2530 * it predates its introduction.
2531 */
2532 ERR("relay_mkdir command is unsupported before LTTng 2.11");
2533 ret = -1;
2534 goto end_no_session;
2535 }
2536
5312a3ed
JG		 2537 header_len = sizeof(path_info_header);
2538 if (payload->size < header_len) {
2539 ERR("Unexpected payload size in \"relay_mkdir\": expected >= %zu bytes, got %zu bytes",
2540 header_len, payload->size);
a1ae2ea5
JD		 2541 ret = -1;
2542 goto end_no_session;
2543 }
2544
5312a3ed
JG		 2545 memcpy(&path_info_header, payload->data, header_len);
2546
a1ae2ea5
JD		 2547 path_info_header.length = be32toh(path_info_header.length);
2548
5312a3ed
JG		 2549 if (payload->size < header_len + path_info_header.length) {
2550 ERR("Unexpected payload size in \"relay_mkdir\" including path: expected >= %zu bytes, got %zu bytes",
2551 header_len + path_info_header.length, payload->size);
2552 ret = -1;
2553 goto end_no_session;
2554 }
2555
a1ae2ea5
JD		 2556 /* Ensure that it fits in local path length. */
2557 if (path_info_header.length >= LTTNG_PATH_MAX) {
2558 ret = -ENAMETOOLONG;
2559 ERR("Path name argument of mkdir command (%" PRIu32 " bytes) exceeds the maximal length allowed (%d bytes)",
2560 path_info_header.length, LTTNG_PATH_MAX);
2561 goto end;
2562 }
2563
5312a3ed
JG		 2564 path_view = lttng_buffer_view_from_view(payload, header_len,
2565 path_info_header.length);
a1ae2ea5 2566
5312a3ed 2567 path = create_output_path(path_view.data);
a1ae2ea5
JD		 2568 if (!path) {
2569 ERR("Failed to create output path");
2570 ret = -1;
2571 goto end;
2572 }
2573
2574 ret = utils_mkdir_recursive(path, S_IRWXU | S_IRWXG, -1, -1);
2575 if (ret < 0) {
2576 ERR("relay creating output directory");
2577 goto end;
2578 }
2579
2580 ret = 0;
2581
2582end:
2583 memset(&reply, 0, sizeof(reply));
2584 if (ret < 0) {
2585 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2586 } else {
2587 reply.ret_code = htobe32(LTTNG_OK);
2588 }
5312a3ed
JG		 2589 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2590 if (send_ret < (ssize_t) sizeof(reply)) {
2591 ERR("Failed to send \"mkdir\" command reply (ret = %zd)", send_ret);
a1ae2ea5
JD		 2592 ret = -1;
2593 }
2594
2595end_no_session:
2596 free(path);
a1ae2ea5
JD		 2597 return ret;
2598}
2599
00fb02ac
JD		 2600static int validate_rotate_rename_path_length(const char *path_type,
2601 uint32_t path_length)
2602{
2603 int ret = 0;
2604
2605 if (path_length > LTTNG_PATH_MAX) {
2606 ret = -ENAMETOOLONG;
2607 ERR("rotate rename \"%s\" path name length (%" PRIu32 " bytes) exceeds the allowed size of %i bytes",
2608 path_type, path_length, LTTNG_PATH_MAX);
2609 } else if (path_length == 0) {
2610 ret = -EINVAL;
2611 ERR("rotate rename \"%s\" path name has an illegal length of 0", path_type);
2612 }
2613 return ret;
2614}
2615
2616/*
2617 * relay_rotate_rename: rename the trace folder after a rotation is
2618 * completed. We are not closing any fd here, just moving the folder, so it
2619 * works even if data is still in-flight.
2620 */
5312a3ed
JG		 2621static int relay_rotate_rename(const struct lttcomm_relayd_hdr *recv_hdr,
2622 struct relay_connection *conn,
2623 const struct lttng_buffer_view *payload)
00fb02ac
JD		 2624{
2625 int ret;
5312a3ed 2626 ssize_t send_ret;
00fb02ac
JD		 2627 struct relay_session *session = conn->session;
2628 struct lttcomm_relayd_generic_reply reply;
2629 struct lttcomm_relayd_rotate_rename header;
5312a3ed 2630 size_t header_len;
00fb02ac 2631 size_t received_paths_size;
00fb02ac 2632 char *complete_old_path = NULL, *complete_new_path = NULL;
5312a3ed
JG		 2633 struct lttng_buffer_view old_path_view;
2634 struct lttng_buffer_view new_path_view;
00fb02ac
JD		 2635
2636 if (!session || !conn->version_check_done) {
2637 ERR("Trying to rename a trace folder before version check");
2638 ret = -1;
2639 goto end_no_reply;
2640 }
2641
2642 if (session->major == 2 && session->minor < 11) {
2643 ERR("relay_rotate_rename command is unsupported before LTTng 2.11");
2644 ret = -1;
2645 goto end_no_reply;
2646 }
2647
5312a3ed
JG		 2648 header_len = sizeof(header);
2649 if (payload->size < header_len) {
2650 ERR("Unexpected payload size in \"relay_rotate_rename\": expected >= %zu bytes, got %zu bytes",
2651 header_len, payload->size);
00fb02ac
JD		 2652 ret = -1;
2653 goto end_no_reply;
2654 }
2655
5312a3ed
JG		 2656 memcpy(&header, payload->data, header_len);
2657
00fb02ac
JD		 2658 header.old_path_length = be32toh(header.old_path_length);
2659 header.new_path_length = be32toh(header.new_path_length);
2660 received_paths_size = header.old_path_length + header.new_path_length;
2661
5312a3ed
JG		 2662 if (payload->size < header_len + received_paths_size) {
2663 ERR("Unexpected payload size in \"relay_rotate_rename\" including paths: expected >= %zu bytes, got %zu bytes",
2664 header_len, payload->size);
2665 ret = -1;
2666 goto end_no_reply;
2667 }
2668
00fb02ac
JD		 2669 /* Ensure the paths don't exceed their allowed size. */
2670 ret = validate_rotate_rename_path_length("old", header.old_path_length);
2671 if (ret) {
2672 goto end;
2673 }
2674 ret = validate_rotate_rename_path_length("new", header.new_path_length);
2675 if (ret) {
2676 goto end;
2677 }
2678
5312a3ed
JG		 2679 old_path_view = lttng_buffer_view_from_view(payload, header_len,
2680 header.old_path_length);
2681 new_path_view = lttng_buffer_view_from_view(payload,
2682 header_len + header.old_path_length,
2683 header.new_path_length);
00fb02ac
JD		 2684
2685 /* Validate that both paths received are NULL terminated. */
5312a3ed 2686 if (old_path_view.data[old_path_view.size - 1] != '\0') {
00fb02ac
JD		 2687 ERR("relay_rotate_rename command's \"old\" path is invalid (not NULL terminated)");
2688 ret = -1;
2689 goto end;
2690 }
5312a3ed 2691 if (new_path_view.data[new_path_view.size - 1] != '\0') {
00fb02ac
JD		 2692 ERR("relay_rotate_rename command's \"new\" path is invalid (not NULL terminated)");
2693 ret = -1;
2694 goto end;
2695 }
2696
5312a3ed 2697 complete_old_path = create_output_path(old_path_view.data);
00fb02ac
JD		 2698 if (!complete_old_path) {
2699 ERR("Failed to build old output path in rotate_rename command");
2700 ret = -1;
2701 goto end;
2702 }
2703
5312a3ed 2704 complete_new_path = create_output_path(new_path_view.data);
00fb02ac
JD		 2705 if (!complete_new_path) {
2706 ERR("Failed to build new output path in rotate_rename command");
2707 ret = -1;
2708 goto end;
2709 }
2710
2711 ret = utils_mkdir_recursive(complete_new_path, S_IRWXU | S_IRWXG,
2712 -1, -1);
2713 if (ret < 0) {
2714 ERR("Failed to mkdir() rotate_rename's \"new\" output directory at \"%s\"",
2715 complete_new_path);
2716 goto end;
2717 }
2718
2719 /*
2720 * If a domain has not yet created its channel, the domain-specific
2721 * folder might not exist, but this is not an error.
2722 */
2723 ret = rename(complete_old_path, complete_new_path);
2724 if (ret < 0 && errno != ENOENT) {
2725 PERROR("Renaming chunk in rotate_rename command from \"%s\" to \"%s\"",
2726 complete_old_path, complete_new_path);
2727 goto end;
2728 }
2729 ret = 0;
2730
2731end:
2732 memset(&reply, 0, sizeof(reply));
2733 if (ret < 0) {
2734 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2735 } else {
2736 reply.ret_code = htobe32(LTTNG_OK);
2737 }
5312a3ed
JG		 2738 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2739 sizeof(reply), 0);
2740 if (send_ret < sizeof(reply)) {
2741 ERR("Failed to send \"rotate rename\" command reply (ret = %zd)",
2742 send_ret);
00fb02ac
JD		 2743 ret = -1;
2744 }
2745
2746end_no_reply:
00fb02ac
JD		 2747 free(complete_old_path);
2748 free(complete_new_path);
2749 return ret;
2750}
2751
e2acc8d2
JD		 2752/*
2753 * Check if all the streams in the session have completed the last rotation.
2754 * The chunk_id value is used to distinguish the cases where a stream was
2755 * closed on the consumerd before the rotation started but it still active on
2756 * the relayd, and the case where a stream appeared on the consumerd/relayd
2757 * after the last rotation started (in that case, it is already writing in the
2758 * new chunk folder).
2759 */
2760static
5312a3ed
JG		 2761int relay_rotate_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2762 struct relay_connection *conn,
2763 const struct lttng_buffer_view *payload)
e2acc8d2
JD		 2764{
2765 struct relay_session *session = conn->session;
2766 struct lttcomm_relayd_rotate_pending msg;
d88744a4 2767 struct lttcomm_relayd_rotate_pending_reply reply;
e2acc8d2
JD		 2768 struct lttng_ht_iter iter;
2769 struct relay_stream *stream;
4f5fb4c3 2770 int ret = 0;
5312a3ed 2771 ssize_t send_ret;
e2acc8d2
JD		 2772 uint64_t chunk_id;
2773 bool rotate_pending = false;
2774
2775 DBG("Rotate pending command received");
2776
2777 if (!session || !conn->version_check_done) {
2778 ERR("Trying to check for data before version check");
2779 ret = -1;
2780 goto end_no_reply;
2781 }
2782
2783 if (session->major == 2 && session->minor < 11) {
2784 ERR("Unsupported feature before 2.11");
2785 ret = -1;
2786 goto end_no_reply;
2787 }
2788
5312a3ed
JG		 2789 if (payload->size < sizeof(msg)) {
2790 ERR("Unexpected payload size in \"relay_rotate_pending\": expected >= %zu bytes, got %zu bytes",
2791 sizeof(msg), payload->size);
e2acc8d2
JD		 2792 ret = -1;
2793 goto end_no_reply;
2794 }
2795
5312a3ed
JG		 2796 memcpy(&msg, payload->data, sizeof(msg));
2797
e2acc8d2 2798 chunk_id = be64toh(msg.chunk_id);
5312a3ed 2799
e2acc8d2
JD		 2800 DBG("Evaluating rotate pending for chunk id %" PRIu64, chunk_id);
2801
2802 /*
2803 * Iterate over all the streams in the session and check if they are
2804 * still waiting for data to perform their rotation.
2805 */
2806 rcu_read_lock();
2807 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2808 node.node) {
2809 if (!stream_get(stream)) {
2810 continue;
2811 }
2812 if (stream->trace->session != session) {
2813 stream_put(stream);
2814 continue;
2815 }
2816 pthread_mutex_lock(&stream->lock);
2817 if (stream->rotate_at_seq_num != -1ULL) {
2818 /* We have not yet performed the rotation. */
2819 rotate_pending = true;
2820 DBG("Stream %" PRIu64 " is still rotating",
2821 stream->stream_handle);
2822 } else if (stream->chunk_id < chunk_id) {
2823 /*
2824 * Stream closed on the consumer but still active on the
2825 * relay.
2826 */
2827 rotate_pending = true;
2828 DBG("Stream %" PRIu64 " did not exist on the consumer "
2829 "when the last rotation started, but is"
2830 "still waiting for data before getting"
2831 "closed",
2832 stream->stream_handle);
2833 }
2834 pthread_mutex_unlock(&stream->lock);
2835 stream_put(stream);
2836 if (rotate_pending) {
2837 goto send_reply;
2838 }
2839 }
2840
2841send_reply:
2842 rcu_read_unlock();
2843 memset(&reply, 0, sizeof(reply));
d88744a4
JD		 2844 reply.generic.ret_code = htobe32((uint32_t) LTTNG_OK);
2845 reply.is_pending = (uint8_t) !!rotate_pending;
5312a3ed 2846 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
e2acc8d2 2847 sizeof(reply), 0);
5312a3ed
JG		 2848 if (send_ret < (ssize_t) sizeof(reply)) {
2849 ERR("Failed to send \"rotate pending\" command reply (ret = %zd)",
2850 send_ret);
e2acc8d2
JD		 2851 ret = -1;
2852 }
2853
2854end_no_reply:
2855 return ret;
2856}
2857
5312a3ed
JG		 2858#define DBG_CMD(cmd_name, conn) \
2859 DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
2860
2861static int relay_process_control_command(struct relay_connection *conn,
2862 const struct lttcomm_relayd_hdr *header,
2863 const struct lttng_buffer_view *payload)
b8aa1682
JD		 2864{
2865 int ret = 0;
2866
5312a3ed 2867 switch (header->cmd) {
b8aa1682 2868 case RELAYD_CREATE_SESSION:
5312a3ed
JG		 2869 DBG_CMD("RELAYD_CREATE_SESSION", conn);
2870 ret = relay_create_session(header, conn, payload);
b8aa1682 2871 break;
b8aa1682 2872 case RELAYD_ADD_STREAM:
5312a3ed
JG		 2873 DBG_CMD("RELAYD_ADD_STREAM", conn);
2874 ret = relay_add_stream(header, conn, payload);
b8aa1682
JD		 2875 break;
2876 case RELAYD_START_DATA:
5312a3ed
JG		 2877 DBG_CMD("RELAYD_START_DATA", conn);
2878 ret = relay_start(header, conn, payload);
b8aa1682
JD		 2879 break;
2880 case RELAYD_SEND_METADATA:
5312a3ed
JG		 2881 DBG_CMD("RELAYD_SEND_METADATA", conn);
2882 ret = relay_recv_metadata(header, conn, payload);
b8aa1682
JD		 2883 break;
2884 case RELAYD_VERSION:
5312a3ed
JG		 2885 DBG_CMD("RELAYD_VERSION", conn);
2886 ret = relay_send_version(header, conn, payload);
b8aa1682 2887 break;
173af62f 2888 case RELAYD_CLOSE_STREAM:
5312a3ed
JG		 2889 DBG_CMD("RELAYD_CLOSE_STREAM", conn);
2890 ret = relay_close_stream(header, conn, payload);
173af62f 2891 break;
6d805429 2892 case RELAYD_DATA_PENDING:
5312a3ed
JG		 2893 DBG_CMD("RELAYD_DATA_PENDING", conn);
2894 ret = relay_data_pending(header, conn, payload);
c8f59ee5
DG		 2895 break;
2896 case RELAYD_QUIESCENT_CONTROL:
5312a3ed
JG		 2897 DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
2898 ret = relay_quiescent_control(header, conn, payload);
c8f59ee5 2899 break;
f7079f67 2900 case RELAYD_BEGIN_DATA_PENDING:
5312a3ed
JG		 2901 DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
2902 ret = relay_begin_data_pending(header, conn, payload);
f7079f67
DG		 2903 break;
2904 case RELAYD_END_DATA_PENDING:
5312a3ed
JG		 2905 DBG_CMD("RELAYD_END_DATA_PENDING", conn);
2906 ret = relay_end_data_pending(header, conn, payload);
f7079f67 2907 break;
1c20f0e2 2908 case RELAYD_SEND_INDEX:
5312a3ed
JG		 2909 DBG_CMD("RELAYD_SEND_INDEX", conn);
2910 ret = relay_recv_index(header, conn, payload);
1c20f0e2 2911 break;
a4baae1b 2912 case RELAYD_STREAMS_SENT:
5312a3ed
JG		 2913 DBG_CMD("RELAYD_STREAMS_SENT", conn);
2914 ret = relay_streams_sent(header, conn, payload);
a4baae1b 2915 break;
93ec662e 2916 case RELAYD_RESET_METADATA:
5312a3ed
JG		 2917 DBG_CMD("RELAYD_RESET_METADATA", conn);
2918 ret = relay_reset_metadata(header, conn, payload);
93ec662e 2919 break;
d3ecc550 2920 case RELAYD_ROTATE_STREAM:
5312a3ed
JG		 2921 DBG_CMD("RELAYD_ROTATE_STREAM", conn);
2922 ret = relay_rotate_session_stream(header, conn, payload);
d3ecc550 2923 break;
00fb02ac 2924 case RELAYD_ROTATE_RENAME:
5312a3ed
JG		 2925 DBG_CMD("RELAYD_ROTATE_RENAME", conn);
2926 ret = relay_rotate_rename(header, conn, payload);
00fb02ac 2927 break;
e2acc8d2 2928 case RELAYD_ROTATE_PENDING:
5312a3ed
JG		 2929 DBG_CMD("RELAYD_ROTATE_PENDING", conn);
2930 ret = relay_rotate_pending(header, conn, payload);
e2acc8d2 2931 break;
a1ae2ea5 2932 case RELAYD_MKDIR:
5312a3ed
JG		 2933 DBG_CMD("RELAYD_MKDIR", conn);
2934 ret = relay_mkdir(header, conn, payload);
a1ae2ea5 2935 break;
b8aa1682
JD		 2936 case RELAYD_UPDATE_SYNC_INFO:
2937 default:
5312a3ed 2938 ERR("Received unknown command (%u)", header->cmd);
58eb9381 2939 relay_unknown_command(conn);
b8aa1682
JD		 2940 ret = -1;
2941 goto end;
2942 }
2943
2944end:
2945 return ret;
2946}
2947
5312a3ed
JG		 2948static int relay_process_control_receive_payload(struct relay_connection *conn)
2949{
2950 int ret = 0;
2951 struct lttng_dynamic_buffer *reception_buffer =
2952 &conn->protocol.ctrl.reception_buffer;
2953 struct ctrl_connection_state_receive_payload *state =
2954 &conn->protocol.ctrl.state.receive_payload;
2955 struct lttng_buffer_view payload_view;
2956
2957 if (state->left_to_receive == 0) {
2958 /* Short-circuit for payload-less commands. */
2959 goto reception_complete;
2960 }
2961
2962 ret = conn->sock->ops->recvmsg(conn->sock,
2963 reception_buffer->data + state->received,
2964 state->left_to_receive, MSG_DONTWAIT);
2965 if (ret < 0) {
2966 ERR("Unable to receive command payload on sock %d", conn->sock->fd);
2967 goto end;
2968 } else if (ret == 0) {
2969 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
2970 ret = -1;
2971 goto end;
2972 }
2973
2974 assert(ret > 0);
2975 assert(ret <= state->left_to_receive);
2976
2977 state->left_to_receive -= ret;
2978 state->received += ret;
2979
2980 if (state->left_to_receive > 0) {
2981 /*
2982 * Can't transition to the protocol's next state, wait to
2983 * receive the rest of the header.
2984 */
2985 DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
2986 state->received, state->left_to_receive,
2987 conn->sock->fd);
2988 ret = 0;
2989 goto end;
2990 }
2991
2992reception_complete:
2993 DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
2994 conn->sock->fd, state->received);
2995 /*
2996 * The payload required to process the command has been received.
2997 * A view to the reception buffer is forwarded to the various
2998 * commands and the state of the control is reset on success.
2999 *
3000 * Commands are responsible for sending their reply to the peer.
3001 */
3002 payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
3003 0, -1);
3004 ret = relay_process_control_command(conn,
3005 &state->header, &payload_view);
3006 if (ret < 0) {
3007 goto end;
3008 }
3009
3010 ret = connection_reset_protocol_state(conn);
3011end:
3012 return ret;
3013}
3014
3015static int relay_process_control_receive_header(struct relay_connection *conn)
3016{
3017 int ret = 0;
3018 struct lttcomm_relayd_hdr header;
3019 struct lttng_dynamic_buffer *reception_buffer =
3020 &conn->protocol.ctrl.reception_buffer;
3021 struct ctrl_connection_state_receive_header *state =
3022 &conn->protocol.ctrl.state.receive_header;
3023
3024 assert(state->left_to_receive != 0);
3025
3026 ret = conn->sock->ops->recvmsg(conn->sock,
3027 reception_buffer->data + state->received,
3028 state->left_to_receive, MSG_DONTWAIT);
3029 if (ret < 0) {
3030 ERR("Unable to receive control command header on sock %d", conn->sock->fd);
3031 goto end;
3032 } else if (ret == 0) {
3033 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
3034 ret = -1;
3035 goto end;
3036 }
3037
3038 assert(ret > 0);
3039 assert(ret <= state->left_to_receive);
3040
3041 state->left_to_receive -= ret;
3042 state->received += ret;
3043
3044 if (state->left_to_receive > 0) {
3045 /*
3046 * Can't transition to the protocol's next state, wait to
3047 * receive the rest of the header.
3048 */
3049 DBG3("Partial reception of control connection protocol header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3050 state->received, state->left_to_receive,
3051 conn->sock->fd);
3052 ret = 0;
3053 goto end;
3054 }
3055
3056 /* Transition to next state: receiving the command's payload. */
3057 conn->protocol.ctrl.state_id =
3058 CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD;
3059 memcpy(&header, reception_buffer->data, sizeof(header));
3060 header.circuit_id = be64toh(header.circuit_id);
3061 header.data_size = be64toh(header.data_size);
3062 header.cmd = be32toh(header.cmd);
3063 header.cmd_version = be32toh(header.cmd_version);
3064 memcpy(&conn->protocol.ctrl.state.receive_payload.header,
3065 &header, sizeof(header));
3066
3067 DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32 ", cmd_version = %" PRIu32 ", payload size = %" PRIu64 " bytes",
3068 conn->sock->fd, header.cmd, header.cmd_version,
3069 header.data_size);
3070
715e6fb1 3071 if (header.data_size > DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE) {
5312a3ed
JG		 3072 ERR("Command header indicates a payload (%" PRIu64 " bytes) that exceeds the maximal payload size allowed on a control connection.",
3073 header.data_size);
3074 ret = -1;
3075 goto end;
3076 }
3077
3078 conn->protocol.ctrl.state.receive_payload.left_to_receive =
3079 header.data_size;
3080 conn->protocol.ctrl.state.receive_payload.received = 0;
3081 ret = lttng_dynamic_buffer_set_size(reception_buffer,
3082 header.data_size);
3083 if (ret) {
3084 goto end;
3085 }
3086
3087 if (header.data_size == 0) {
3088 /*
3089 * Manually invoke the next state as the poll loop
3090 * will not wake-up to allow us to proceed further.
3091 */
3092 ret = relay_process_control_receive_payload(conn);
3093 }
3094end:
3095 return ret;
3096}
3097
3098/*
3099 * Process the commands received on the control socket
3100 */
3101static int relay_process_control(struct relay_connection *conn)
3102{
3103 int ret = 0;
3104
3105 switch (conn->protocol.ctrl.state_id) {
3106 case CTRL_CONNECTION_STATE_RECEIVE_HEADER:
3107 ret = relay_process_control_receive_header(conn);
3108 break;
3109 case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD:
3110 ret = relay_process_control_receive_payload(conn);
3111 break;
3112 default:
3113 ERR("Unknown control connection protocol state encountered.");
3114 abort();
3115 }
3116
3117 return ret;
3118}
3119
7d2f7452
DG		 3120/*
3121 * Handle index for a data stream.
3122 *
7591bab1 3123 * Called with the stream lock held.
7d2f7452
DG		 3124 *
3125 * Return 0 on success else a negative value.
3126 */
3127static int handle_index_data(struct relay_stream *stream, uint64_t net_seq_num,
5312a3ed 3128 bool rotate_index, bool *flushed, uint64_t total_size)
7d2f7452 3129{
7591bab1
MD		 3130 int ret = 0;
3131 uint64_t data_offset;
3132 struct relay_index *index;
7d2f7452 3133
7d2f7452
DG		 3134 /* Get data offset because we are about to update the index. */
3135 data_offset = htobe64(stream->tracefile_size_current);
3136
65d66b19
MD		 3137 DBG("handle_index_data: stream %" PRIu64 " net_seq_num %" PRIu64 " data offset %" PRIu64,
3138 stream->stream_handle, net_seq_num, stream->tracefile_size_current);
7591bab1 3139
7d2f7452 3140 /*
7591bab1
MD		 3141 * Lookup for an existing index for that stream id/sequence
3142 * number. If it exists, the control thread has already received the
3143 * data for it, thus we need to write it to disk.
7d2f7452 3144 */
7591bab1 3145 index = relay_index_get_by_id_or_create(stream, net_seq_num);
7d2f7452 3146 if (!index) {
7591bab1
MD		 3147 ret = -1;
3148 goto end;
7d2f7452
DG		 3149 }
3150
f8f3885c 3151 if (rotate_index || !stream->index_file) {
d3ecc550
JD		 3152 ret = create_rotate_index_file(stream);
3153 if (ret < 0) {
3154 ERR("Failed to rotate index");
7591bab1
MD		 3155 /* Put self-ref for this index due to error. */
3156 relay_index_put(index);
f8f3885c 3157 index = NULL;
7591bab1 3158 goto end;
7d2f7452 3159 }
7d2f7452
DG		 3160 }
3161
f8f3885c 3162 if (relay_index_set_file(index, stream->index_file, data_offset)) {
7591bab1
MD		 3163 ret = -1;
3164 /* Put self-ref for this index due to error. */
3165 relay_index_put(index);
f8f3885c 3166 index = NULL;
7591bab1 3167 goto end;
7d2f7452
DG		 3168 }
3169
7591bab1
MD		 3170 ret = relay_index_try_flush(index);
3171 if (ret == 0) {
a44ca2ca
MD		 3172 tracefile_array_commit_seq(stream->tfa);
3173 stream->index_received_seqcount++;
d3ecc550 3174 *flushed = true;
7591bab1 3175 } else if (ret > 0) {
d3ecc550 3176 index->total_size = total_size;
7591bab1
MD		 3177 /* No flush. */
3178 ret = 0;
3179 } else {
3180 /* Put self-ref for this index due to error. */
3181 relay_index_put(index);
f8f3885c 3182 index = NULL;
7591bab1
MD		 3183 ret = -1;
3184 }
3185end:
7d2f7452
DG		 3186 return ret;
3187}
3188
5312a3ed 3189static int relay_process_data_receive_header(struct relay_connection *conn)
b8aa1682 3190{
5312a3ed
JG		 3191 int ret;
3192 struct data_connection_state_receive_header *state =
3193 &conn->protocol.data.state.receive_header;
3194 struct lttcomm_relayd_data_hdr header;
b8aa1682 3195 struct relay_stream *stream;
5312a3ed
JG		 3196
3197 assert(state->left_to_receive != 0);
3198
3199 ret = conn->sock->ops->recvmsg(conn->sock,
3200 state->header_reception_buffer + state->received,
3201 state->left_to_receive, MSG_DONTWAIT);
3202 if (ret < 0) {
3203 ERR("Unable to receive data header on sock %d", conn->sock->fd);
3204 goto end;
3205 } else if (ret == 0) {
3206 /* Orderly shutdown. Not necessary to print an error. */
3207 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
b8aa1682
JD		 3208 ret = -1;
3209 goto end;
3210 }
3211
5312a3ed
JG		 3212 assert(ret > 0);
3213 assert(ret <= state->left_to_receive);
3214
3215 state->left_to_receive -= ret;
3216 state->received += ret;
3217
3218 if (state->left_to_receive > 0) {
3219 /*
3220 * Can't transition to the protocol's next state, wait to
3221 * receive the rest of the header.
3222 */
3223 DBG3("Partial reception of data connection header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3224 state->received, state->left_to_receive,
3225 conn->sock->fd);
3226 ret = 0;
7591bab1 3227 goto end;
b8aa1682 3228 }
b8aa1682 3229
5312a3ed
JG		 3230 /* Transition to next state: receiving the payload. */
3231 conn->protocol.data.state_id = DATA_CONNECTION_STATE_RECEIVE_PAYLOAD;
173af62f 3232
5312a3ed
JG		 3233 memcpy(&header, state->header_reception_buffer, sizeof(header));
3234 header.circuit_id = be64toh(header.circuit_id);
3235 header.stream_id = be64toh(header.stream_id);
3236 header.data_size = be32toh(header.data_size);
3237 header.net_seq_num = be64toh(header.net_seq_num);
3238 header.padding_size = be32toh(header.padding_size);
3239 memcpy(&conn->protocol.data.state.receive_payload.header, &header, sizeof(header));
3240
3241 conn->protocol.data.state.receive_payload.left_to_receive =
3242 header.data_size;
3243 conn->protocol.data.state.receive_payload.received = 0;
3244 conn->protocol.data.state.receive_payload.rotate_index = false;
3245
3246 DBG("Received data connection header on fd %i: circuit_id = %" PRIu64 ", stream_id = %" PRIu64 ", data_size = %" PRIu32 ", net_seq_num = %" PRIu64 ", padding_size = %" PRIu32,
3247 conn->sock->fd, header.circuit_id,
3248 header.stream_id, header.data_size,
3249 header.net_seq_num, header.padding_size);
3250
3251 stream = stream_get_by_id(header.stream_id);
3252 if (!stream) {
3253 DBG("relay_process_data_receive_payload: Cannot find stream %" PRIu64,
3254 header.stream_id);
3255 ret = 0;
3256 goto end;
3257 }
b8aa1682 3258
7591bab1
MD		 3259 pthread_mutex_lock(&stream->lock);
3260
1c20f0e2 3261 /* Check if a rotation is needed. */
0f907de1 3262 if (stream->tracefile_size > 0 &&
5312a3ed 3263 (stream->tracefile_size_current + header.data_size) >
0f907de1 3264 stream->tracefile_size) {
a44ca2ca
MD		 3265 uint64_t old_id, new_id;
3266
3267 old_id = tracefile_array_get_file_index_head(stream->tfa);
3268 tracefile_array_file_rotate(stream->tfa);
3269
3270 /* new_id is updated by utils_rotate_stream_file. */
3271 new_id = old_id;
6b6b9a5a 3272
7591bab1
MD		 3273 ret = utils_rotate_stream_file(stream->path_name,
3274 stream->channel_name, stream->tracefile_size,
3275 stream->tracefile_count, -1,
3276 -1, stream->stream_fd->fd,
a44ca2ca 3277 &new_id, &stream->stream_fd->fd);
0f907de1 3278 if (ret < 0) {
5312a3ed 3279 ERR("Failed to rotate stream output file");
7591bab1
MD		 3280 goto end_stream_unlock;
3281 }
5312a3ed 3282
7591bab1
MD		 3283 /*
3284 * Reset current size because we just performed a stream
3285 * rotation.
3286 */
a6976990 3287 stream->tracefile_size_current = 0;
5312a3ed 3288 conn->protocol.data.state.receive_payload.rotate_index = true;
1c20f0e2
JD		 3289 }
3290
5312a3ed
JG		 3291 ret = 0;
3292end_stream_unlock:
3293 pthread_mutex_unlock(&stream->lock);
3294 stream_put(stream);
3295end:
3296 return ret;
3297}
3298
3299static int relay_process_data_receive_payload(struct relay_connection *conn)
3300{
3301 int ret;
3302 struct relay_stream *stream;
3303 struct data_connection_state_receive_payload *state =
3304 &conn->protocol.data.state.receive_payload;
3305 const size_t chunk_size = RECV_DATA_BUFFER_SIZE;
3306 char data_buffer[chunk_size];
3307 bool partial_recv = false;
3308 bool new_stream = false, close_requested = false, index_flushed = false;
3309 uint64_t left_to_receive = state->left_to_receive;
3310 struct relay_session *session;
3311
3312 stream = stream_get_by_id(state->header.stream_id);
3313 if (!stream) {
3314 DBG("relay_process_data_receive_payload: Cannot find stream %" PRIu64,
3315 state->header.stream_id);
3316 ret = 0;
3317 goto end;
1c20f0e2
JD		 3318 }
3319
5312a3ed
JG		 3320 pthread_mutex_lock(&stream->lock);
3321 session = stream->trace->session;
1d4dfdef 3322
5312a3ed
JG		 3323 DBG3("Receiving data for stream id %" PRIu64 " seqnum %" PRIu64 ", %" PRIu64" bytes received, %" PRIu64 " bytes left to receive",
3324 state->header.stream_id, state->header.net_seq_num,
3325 state->received, left_to_receive);
3326
3327 /*
3328 * The size of the "chunk" received on any iteration is bounded by:
3329 * - the data left to receive,
3330 * - the data immediately available on the socket,
3331 * - the on-stack data buffer
3332 */
3333 while (left_to_receive > 0 && !partial_recv) {
3334 ssize_t write_ret;
3335 size_t recv_size = min(left_to_receive, chunk_size);
3336
3337 ret = conn->sock->ops->recvmsg(conn->sock, data_buffer,
3338 recv_size, MSG_DONTWAIT);
3339 if (ret < 0) {
3340 ERR("Socket %d error %d", conn->sock->fd, ret);
0848dba7
MD		 3341 ret = -1;
3342 goto end_stream_unlock;
5312a3ed
JG		 3343 } else if (ret == 0) {
3344 /* No more data ready to be consumed on socket. */
3345 DBG3("No more data ready for consumption on data socket of stream id %" PRIu64,
3346 state->header.stream_id);
3347 break;
3348 } else if (ret < (int) recv_size) {
3349 /*
3350 * All the data available on the socket has been
3351 * consumed.
3352 */
3353 partial_recv = true;
0848dba7
MD		 3354 }
3355
5312a3ed
JG		 3356 recv_size = ret;
3357
0848dba7 3358 /* Write data to stream output fd. */
5312a3ed 3359 write_ret = lttng_write(stream->stream_fd->fd, data_buffer,
0848dba7 3360 recv_size);
5312a3ed 3361 if (write_ret < (ssize_t) recv_size) {
0848dba7
MD		 3362 ERR("Relay error writing data to file");
3363 ret = -1;
3364 goto end_stream_unlock;
3365 }
3366
5312a3ed
JG		 3367 left_to_receive -= recv_size;
3368 state->received += recv_size;
3369 state->left_to_receive = left_to_receive;
3370
0848dba7 3371 DBG2("Relay wrote %zd bytes to tracefile for stream id %" PRIu64,
5312a3ed
JG		 3372 write_ret, stream->stream_handle);
3373 }
3374
3375 if (state->left_to_receive > 0) {
3376 /*
3377 * Did not receive all the data expected, wait for more data to
3378 * become available on the socket.
3379 */
3380 DBG3("Partial receive on data connection of stream id %" PRIu64 ", %" PRIu64 " bytes received, %" PRIu64 " bytes left to receive",
3381 state->header.stream_id, state->received,
3382 state->left_to_receive);
3383 ret = 0;
3384 goto end_stream_unlock;
0848dba7 3385 }
5ab7344e 3386
7591bab1 3387 ret = write_padding_to_file(stream->stream_fd->fd,
5312a3ed 3388 state->header.padding_size);
1d4dfdef 3389 if (ret < 0) {
65d66b19 3390 ERR("write_padding_to_file: fail stream %" PRIu64 " net_seq_num %" PRIu64 " ret %d",
5312a3ed
JG		 3391 stream->stream_handle,
3392 state->header.net_seq_num, ret);
7591bab1 3393 goto end_stream_unlock;
1d4dfdef 3394 }
5312a3ed
JG		 3395
3396
3397 if (session->minor >= 4 && !session->snapshot) {
3398 ret = handle_index_data(stream, state->header.net_seq_num,
3399 state->rotate_index, &index_flushed, state->header.data_size + state->header.padding_size);
3400 if (ret < 0) {
3401 ERR("handle_index_data: fail stream %" PRIu64 " net_seq_num %" PRIu64 " ret %d",
3402 stream->stream_handle,
3403 state->header.net_seq_num, ret);
3404 goto end_stream_unlock;
3405 }
3406 }
3407
3408 stream->tracefile_size_current += state->header.data_size +
3409 state->header.padding_size;
3410
c0bae11d
MD		 3411 if (stream->prev_seq == -1ULL) {
3412 new_stream = true;
3413 }
d3ecc550
JD		 3414 if (index_flushed) {
3415 stream->pos_after_last_complete_data_index =
3416 stream->tracefile_size_current;
3417 }
c0bae11d 3418
5312a3ed
JG		 3419 stream->prev_seq = state->header.net_seq_num;
3420
3421 /*
3422 * Resetting the protocol state (to RECEIVE_HEADER) will trash the
3423 * contents of *state which are aliased (union) to the same location as
3424 * the new state. Don't use it beyond this point.
3425 */
3426 connection_reset_protocol_state(conn);
3427 state = NULL;
173af62f 3428
d3ecc550
JD		 3429 ret = try_rotate_stream(stream);
3430 if (ret < 0) {
3431 goto end_stream_unlock;
3432 }
3433
7591bab1 3434end_stream_unlock:
bda7c7b9 3435 close_requested = stream->close_requested;
7591bab1 3436 pthread_mutex_unlock(&stream->lock);
5312a3ed 3437 if (close_requested && left_to_receive == 0) {
bda7c7b9
JG		 3438 try_stream_close(stream);
3439 }
3440
c0bae11d
MD		 3441 if (new_stream) {
3442 pthread_mutex_lock(&session->lock);
3443 uatomic_set(&session->new_streams, 1);
3444 pthread_mutex_unlock(&session->lock);
3445 }
5312a3ed 3446
7591bab1 3447 stream_put(stream);
b8aa1682
JD		 3448end:
3449 return ret;
3450}
3451
5312a3ed
JG		 3452/*
3453 * relay_process_data: Process the data received on the data socket
3454 */
3455static int relay_process_data(struct relay_connection *conn)
3456{
3457 int ret;
3458
3459 switch (conn->protocol.data.state_id) {
3460 case DATA_CONNECTION_STATE_RECEIVE_HEADER:
3461 ret = relay_process_data_receive_header(conn);
3462 break;
3463 case DATA_CONNECTION_STATE_RECEIVE_PAYLOAD:
3464 ret = relay_process_data_receive_payload(conn);
3465 break;
3466 default:
3467 ERR("Unexpected data connection communication state.");
3468 abort();
3469 }
3470
3471 return ret;
3472}
3473
7591bab1 3474static void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
b8aa1682
JD		 3475{
3476 int ret;
3477
58eb9381 3478 (void) lttng_poll_del(events, pollfd);
b8aa1682
JD		 3479
3480 ret = close(pollfd);
3481 if (ret < 0) {
3482 ERR("Closing pollfd %d", pollfd);
3483 }
3484}
3485
7591bab1
MD		 3486static void relay_thread_close_connection(struct lttng_poll_event *events,
3487 int pollfd, struct relay_connection *conn)
9d1bbf21 3488{
7591bab1 3489 const char *type_str;
2a174661 3490
7591bab1
MD		 3491 switch (conn->type) {
3492 case RELAY_DATA:
3493 type_str = "Data";
3494 break;
3495 case RELAY_CONTROL:
3496 type_str = "Control";
3497 break;
3498 case RELAY_VIEWER_COMMAND:
3499 type_str = "Viewer Command";
3500 break;
3501 case RELAY_VIEWER_NOTIFICATION:
3502 type_str = "Viewer Notification";
3503 break;
3504 default:
3505 type_str = "Unknown";
9d1bbf21 3506 }
7591bab1
MD		 3507 cleanup_connection_pollfd(events, pollfd);
3508 connection_put(conn);
3509 DBG("%s connection closed with %d", type_str, pollfd);
b8aa1682
JD		 3510}
3511
3512/*
3513 * This thread does the actual work
3514 */
7591bab1 3515static void *relay_thread_worker(void *data)
b8aa1682 3516{
beaad64c
DG		 3517 int ret, err = -1, last_seen_data_fd = -1;
3518 uint32_t nb_fd;
b8aa1682
JD		 3519 struct lttng_poll_event events;
3520 struct lttng_ht *relay_connections_ht;
b8aa1682 3521 struct lttng_ht_iter iter;
90e7d72f 3522 struct relay_connection *destroy_conn = NULL;
b8aa1682
JD		 3523
3524 DBG("[thread] Relay worker started");
3525
9d1bbf21
MD		 3526 rcu_register_thread();
3527
55706a7d
MD		 3528 health_register(health_relayd, HEALTH_RELAYD_TYPE_WORKER);
3529
9b5e0863
MD		 3530 if (testpoint(relayd_thread_worker)) {
3531 goto error_testpoint;
3532 }
3533
f385ae0a
MD		 3534 health_code_update();
3535
b8aa1682
JD		 3536 /* table of connections indexed on socket */
3537 relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
095a4ae5
MD		 3538 if (!relay_connections_ht) {
3539 goto relay_connections_ht_error;
3540 }
b8aa1682 3541
b8aa1682
JD		 3542 ret = create_thread_poll_set(&events, 2);
3543 if (ret < 0) {
3544 goto error_poll_create;
3545 }
3546
58eb9381 3547 ret = lttng_poll_add(&events, relay_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
b8aa1682
JD		 3548 if (ret < 0) {
3549 goto error;
3550 }
3551
beaad64c 3552restart:
b8aa1682 3553 while (1) {
beaad64c
DG		 3554 int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1;
3555
f385ae0a
MD		 3556 health_code_update();
3557
b8aa1682 3558 /* Infinite blocking call, waiting for transmission */
87c1611d 3559 DBG3("Relayd worker thread polling...");
f385ae0a 3560 health_poll_entry();
b8aa1682 3561 ret = lttng_poll_wait(&events, -1);
f385ae0a 3562 health_poll_exit();
b8aa1682
JD		 3563 if (ret < 0) {
3564 /*
3565 * Restart interrupted system call.
3566 */
3567 if (errno == EINTR) {
3568 goto restart;
3569 }
3570 goto error;
3571 }
3572
0d9c5d77
DG		 3573 nb_fd = ret;
3574
beaad64c 3575 /*
7591bab1
MD		 3576 * Process control. The control connection is
3577 * prioritized so we don't starve it with high
3578 * throughput tracing data on the data connection.
beaad64c 3579 */
b8aa1682
JD		 3580 for (i = 0; i < nb_fd; i++) {
3581 /* Fetch once the poll data */
beaad64c
DG		 3582 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
3583 int pollfd = LTTNG_POLL_GETFD(&events, i);
b8aa1682 3584
f385ae0a
MD		 3585 health_code_update();
3586
fd20dac9 3587 if (!revents) {
7591bab1
MD		 3588 /*
3589 * No activity for this FD (poll
3590 * implementation).
3591 */
fd20dac9
MD		 3592 continue;
3593 }
3594
b8aa1682
JD		 3595 /* Thread quit pipe has been closed. Killing thread. */
3596 ret = check_thread_quit_pipe(pollfd, revents);
3597 if (ret) {
095a4ae5
MD		 3598 err = 0;
3599 goto exit;
b8aa1682
JD		 3600 }
3601
58eb9381
DG		 3602 /* Inspect the relay conn pipe for new connection */
3603 if (pollfd == relay_conn_pipe[0]) {
03e43155 3604 if (revents & LPOLLIN) {
90e7d72f
JG		 3605 struct relay_connection *conn;
3606
58eb9381 3607 ret = lttng_read(relay_conn_pipe[0], &conn, sizeof(conn));
b8aa1682
JD		 3608 if (ret < 0) {
3609 goto error;
3610 }
58eb9381
DG		 3611 lttng_poll_add(&events, conn->sock->fd,
3612 LPOLLIN | LPOLLRDHUP);
7591bab1 3613 connection_ht_add(relay_connections_ht, conn);
58eb9381 3614 DBG("Connection socket %d added", conn->sock->fd);
03e43155
MD		 3615 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3616 ERR("Relay connection pipe error");
3617 goto error;
3618 } else {
3619 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
3620 goto error;
b8aa1682 3621 }
58eb9381 3622 } else {
90e7d72f
JG		 3623 struct relay_connection *ctrl_conn;
3624
7591bab1 3625 ctrl_conn = connection_get_by_sock(relay_connections_ht, pollfd);
58eb9381 3626 /* If not found, there is a synchronization issue. */
90e7d72f 3627 assert(ctrl_conn);
58eb9381 3628
03e43155
MD		 3629 if (ctrl_conn->type == RELAY_DATA) {
3630 if (revents & LPOLLIN) {
beaad64c
DG		 3631 /*
3632 * Flag the last seen data fd not deleted. It will be
3633 * used as the last seen fd if any fd gets deleted in
3634 * this first loop.
3635 */
3636 last_notdel_data_fd = pollfd;
3637 }
03e43155
MD		 3638 goto put_ctrl_connection;
3639 }
3640 assert(ctrl_conn->type == RELAY_CONTROL);
3641
3642 if (revents & LPOLLIN) {
5312a3ed
JG		 3643 ret = relay_process_control(ctrl_conn);
3644 if (ret < 0) {
3645 /* Clear the connection on error. */
3646 relay_thread_close_connection(&events,
3647 pollfd,
03e43155 3648 ctrl_conn);
03e43155 3649 }
5312a3ed 3650 seen_control = 1;
03e43155
MD		 3651 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3652 relay_thread_close_connection(&events,
3653 pollfd, ctrl_conn);
3654 if (last_seen_data_fd == pollfd) {
3655 last_seen_data_fd = last_notdel_data_fd;
3656 }
58eb9381 3657 } else {
03e43155
MD		 3658 ERR("Unexpected poll events %u for control sock %d",
3659 revents, pollfd);
3660 connection_put(ctrl_conn);
3661 goto error;
beaad64c 3662 }
03e43155 3663 put_ctrl_connection:
7591bab1 3664 connection_put(ctrl_conn);
beaad64c
DG		 3665 }
3666 }
3667
3668 /*
3669 * The last loop handled a control request, go back to poll to make
3670 * sure we prioritise the control socket.
3671 */
3672 if (seen_control) {
3673 continue;
3674 }
3675
3676 if (last_seen_data_fd >= 0) {
3677 for (i = 0; i < nb_fd; i++) {
3678 int pollfd = LTTNG_POLL_GETFD(&events, i);
f385ae0a
MD		 3679
3680 health_code_update();
3681
beaad64c
DG		 3682 if (last_seen_data_fd == pollfd) {
3683 idx = i;
3684 break;
3685 }
3686 }
3687 }
3688
3689 /* Process data connection. */
3690 for (i = idx + 1; i < nb_fd; i++) {
3691 /* Fetch the poll data. */
3692 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
3693 int pollfd = LTTNG_POLL_GETFD(&events, i);
90e7d72f 3694 struct relay_connection *data_conn;
beaad64c 3695
f385ae0a
MD		 3696 health_code_update();
3697
fd20dac9
MD		 3698 if (!revents) {
3699 /* No activity for this FD (poll implementation). */
3700 continue;
3701 }
3702
beaad64c 3703 /* Skip the command pipe. It's handled in the first loop. */
58eb9381 3704 if (pollfd == relay_conn_pipe[0]) {
beaad64c
DG		 3705 continue;
3706 }
3707
7591bab1 3708 data_conn = connection_get_by_sock(relay_connections_ht, pollfd);
90e7d72f 3709 if (!data_conn) {
fd20dac9 3710 /* Skip it. Might be removed before. */
fd20dac9
MD		 3711 continue;
3712 }
03e43155
MD		 3713 if (data_conn->type == RELAY_CONTROL) {
3714 goto put_data_connection;
3715 }
3716 assert(data_conn->type == RELAY_DATA);
fd20dac9
MD		 3717
3718 if (revents & LPOLLIN) {
90e7d72f 3719 ret = relay_process_data(data_conn);
fd20dac9
MD		 3720 /* Connection closed */
3721 if (ret < 0) {
7591bab1 3722 relay_thread_close_connection(&events, pollfd,
03e43155 3723 data_conn);
fd20dac9
MD		 3724 /*
3725 * Every goto restart call sets the last seen fd where
3726 * here we don't really care since we gracefully
3727 * continue the loop after the connection is deleted.
3728 */
3729 } else {
3730 /* Keep last seen port. */
3731 last_seen_data_fd = pollfd;
7591bab1 3732 connection_put(data_conn);
fd20dac9 3733 goto restart;
b8aa1682 3734 }
03e43155
MD		 3735 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3736 relay_thread_close_connection(&events, pollfd,
3737 data_conn);
3738 } else {
3739 ERR("Unknown poll events %u for data sock %d",
3740 revents, pollfd);
b8aa1682 3741 }
03e43155 3742 put_data_connection:
7591bab1 3743 connection_put(data_conn);
b8aa1682 3744 }
beaad64c 3745 last_seen_data_fd = -1;
b8aa1682
JD		 3746 }
3747
f385ae0a
MD		 3748 /* Normal exit, no error */
3749 ret = 0;
3750
095a4ae5 3751exit:
b8aa1682 3752error:
58eb9381 3753 /* Cleanup reamaining connection object. */
9d1bbf21 3754 rcu_read_lock();
90e7d72f
JG		 3755 cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter,
3756 destroy_conn,
58eb9381 3757 sock_n.node) {
f385ae0a 3758 health_code_update();
98ba050e
JR		 3759
3760 if (session_abort(destroy_conn->session)) {
3761 assert(0);
3762 }
3763
7591bab1
MD		 3764 /*
3765 * No need to grab another ref, because we own
3766 * destroy_conn.
3767 */
3768 relay_thread_close_connection(&events, destroy_conn->sock->fd,
3769 destroy_conn);
b8aa1682 3770 }
94d49140 3771 rcu_read_unlock();
7591bab1
MD		 3772
3773 lttng_poll_clean(&events);
7d2f7452 3774error_poll_create:
b8aa1682 3775 lttng_ht_destroy(relay_connections_ht);
095a4ae5 3776relay_connections_ht_error:
58eb9381
DG		 3777 /* Close relay conn pipes */
3778 utils_close_pipe(relay_conn_pipe);
095a4ae5
MD		 3779 if (err) {
3780 DBG("Thread exited with error");
3781 }
b8aa1682 3782 DBG("Worker thread cleanup complete");
9b5e0863 3783error_testpoint:
f385ae0a
MD		 3784 if (err) {
3785 health_error();
3786 ERR("Health error occurred in %s", __func__);
3787 }
3788 health_unregister(health_relayd);
9d1bbf21 3789 rcu_unregister_thread();
b4aacfdc 3790 lttng_relay_stop_threads();
b8aa1682
JD		 3791 return NULL;
3792}
3793
3794/*
3795 * Create the relay command pipe to wake thread_manage_apps.
3796 * Closed in cleanup().
3797 */
58eb9381 3798static int create_relay_conn_pipe(void)
b8aa1682 3799{
a02de639 3800 int ret;
b8aa1682 3801
58eb9381 3802 ret = utils_create_pipe_cloexec(relay_conn_pipe);
b8aa1682 3803
b8aa1682
JD		 3804 return ret;
3805}
3806
3807/*
3808 * main
3809 */
3810int main(int argc, char **argv)
3811{
178a0557 3812 int ret = 0, retval = 0;
b8aa1682
JD		 3813 void *status;
3814
b8aa1682
JD		 3815 /* Parse arguments */
3816 progname = argv[0];
178a0557
MD		 3817 if (set_options(argc, argv)) {
3818 retval = -1;
3819 goto exit_options;
b8aa1682
JD		 3820 }
3821
178a0557
MD		 3822 if (set_signal_handler()) {
3823 retval = -1;
3824 goto exit_options;
b8aa1682
JD		 3825 }
3826
4d513a50
DG		 3827 /* Try to create directory if -o, --output is specified. */
3828 if (opt_output_path) {
994fa64f
DG		 3829 if (*opt_output_path != '/') {
3830 ERR("Please specify an absolute path for -o, --output PATH");
178a0557
MD		 3831 retval = -1;
3832 goto exit_options;
994fa64f
DG		 3833 }
3834
d77dded2
JG		 3835 ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG,
3836 -1, -1);
4d513a50
DG		 3837 if (ret < 0) {
3838 ERR("Unable to create %s", opt_output_path);
178a0557
MD		 3839 retval = -1;
3840 goto exit_options;
4d513a50
DG		 3841 }
3842 }
3843
b8aa1682 3844 /* Daemonize */
b5218ffb 3845 if (opt_daemon || opt_background) {
3fd27398
MD		 3846 int i;
3847
3848 ret = lttng_daemonize(&child_ppid, &recv_child_signal,
3849 !opt_background);
b8aa1682 3850 if (ret < 0) {
178a0557
MD		 3851 retval = -1;
3852 goto exit_options;
b8aa1682 3853 }
3fd27398
MD		 3854
3855 /*
3856 * We are in the child. Make sure all other file
3857 * descriptors are closed, in case we are called with
3858 * more opened file descriptors than the standard ones.
3859 */
3860 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
3861 (void) close(i);
3862 }
3863 }
3864
178a0557
MD		 3865 /* Initialize thread health monitoring */
3866 health_relayd = health_app_create(NR_HEALTH_RELAYD_TYPES);
3867 if (!health_relayd) {
3868 PERROR("health_app_create error");
3869 retval = -1;
3870 goto exit_health_app_create;
3871 }
3872
3fd27398 3873 /* Create thread quit pipe */
178a0557
MD		 3874 if (init_thread_quit_pipe()) {
3875 retval = -1;
3876 goto exit_init_data;
b8aa1682
JD		 3877 }
3878
b8aa1682 3879 /* Setup the thread apps communication pipe. */
178a0557
MD		 3880 if (create_relay_conn_pipe()) {
3881 retval = -1;
3882 goto exit_init_data;
b8aa1682
JD		 3883 }
3884
3885 /* Init relay command queue. */
8bdee6e2 3886 cds_wfcq_init(&relay_conn_queue.head, &relay_conn_queue.tail);
b8aa1682 3887
554831e7
MD		 3888 /* Initialize communication library */
3889 lttcomm_init();
87e45c13 3890 lttcomm_inet_init();
554831e7 3891
d3e2ba59 3892 /* tables of sessions indexed by session ID */
7591bab1
MD		 3893 sessions_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
3894 if (!sessions_ht) {
178a0557
MD		 3895 retval = -1;
3896 goto exit_init_data;
d3e2ba59
JD		 3897 }
3898
3899 /* tables of streams indexed by stream ID */
2a174661 3900 relay_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d3e2ba59 3901 if (!relay_streams_ht) {
178a0557
MD		 3902 retval = -1;
3903 goto exit_init_data;
d3e2ba59
JD		 3904 }
3905
3906 /* tables of streams indexed by stream ID */
92c6ca54
DG		 3907 viewer_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
3908 if (!viewer_streams_ht) {
178a0557
MD		 3909 retval = -1;
3910 goto exit_init_data;
55706a7d
MD		 3911 }
3912
65931c8b 3913 ret = utils_create_pipe(health_quit_pipe);
178a0557
MD		 3914 if (ret) {
3915 retval = -1;
3916 goto exit_health_quit_pipe;
65931c8b
MD		 3917 }
3918
3919 /* Create thread to manage the client socket */
1a1a34b4 3920 ret = pthread_create(&health_thread, default_pthread_attr(),
65931c8b 3921 thread_manage_health, (void *) NULL);
178a0557
MD		 3922 if (ret) {
3923 errno = ret;
65931c8b 3924 PERROR("pthread_create health");
178a0557
MD		 3925 retval = -1;
3926 goto exit_health_thread;
65931c8b
MD		 3927 }
3928
b8aa1682 3929 /* Setup the dispatcher thread */
1a1a34b4 3930 ret = pthread_create(&dispatcher_thread, default_pthread_attr(),
b8aa1682 3931 relay_thread_dispatcher, (void *) NULL);
178a0557
MD		 3932 if (ret) {
3933 errno = ret;
b8aa1682 3934 PERROR("pthread_create dispatcher");
178a0557
MD		 3935 retval = -1;
3936 goto exit_dispatcher_thread;
b8aa1682
JD		 3937 }
3938
3939 /* Setup the worker thread */
1a1a34b4 3940 ret = pthread_create(&worker_thread, default_pthread_attr(),
7591bab1 3941 relay_thread_worker, NULL);
178a0557
MD		 3942 if (ret) {
3943 errno = ret;
b8aa1682 3944 PERROR("pthread_create worker");
178a0557
MD		 3945 retval = -1;
3946 goto exit_worker_thread;
b8aa1682
JD		 3947 }
3948
3949 /* Setup the listener thread */
1a1a34b4 3950 ret = pthread_create(&listener_thread, default_pthread_attr(),
b8aa1682 3951 relay_thread_listener, (void *) NULL);
178a0557
MD		 3952 if (ret) {
3953 errno = ret;
b8aa1682 3954 PERROR("pthread_create listener");
178a0557
MD		 3955 retval = -1;
3956 goto exit_listener_thread;
b8aa1682
JD		 3957 }
3958
7591bab1 3959 ret = relayd_live_create(live_uri);
178a0557 3960 if (ret) {
d3e2ba59 3961 ERR("Starting live viewer threads");
178a0557 3962 retval = -1;
50138f51 3963 goto exit_live;
d3e2ba59
JD		 3964 }
3965
178a0557
MD		 3966 /*
3967 * This is where we start awaiting program completion (e.g. through
3968 * signal that asks threads to teardown).
3969 */
3970
3971 ret = relayd_live_join();
3972 if (ret) {
3973 retval = -1;
3974 }
50138f51 3975exit_live:
178a0557 3976
b8aa1682 3977 ret = pthread_join(listener_thread, &status);
178a0557
MD		 3978 if (ret) {
3979 errno = ret;
3980 PERROR("pthread_join listener_thread");
3981 retval = -1;
b8aa1682
JD		 3982 }
3983
178a0557 3984exit_listener_thread:
b8aa1682 3985 ret = pthread_join(worker_thread, &status);
178a0557
MD		 3986 if (ret) {
3987 errno = ret;
3988 PERROR("pthread_join worker_thread");
3989 retval = -1;
b8aa1682
JD		 3990 }
3991
178a0557 3992exit_worker_thread:
b8aa1682 3993 ret = pthread_join(dispatcher_thread, &status);
178a0557
MD		 3994 if (ret) {
3995 errno = ret;
3996 PERROR("pthread_join dispatcher_thread");
3997 retval = -1;
b8aa1682 3998 }
178a0557 3999exit_dispatcher_thread:
42415026 4000
65931c8b 4001 ret = pthread_join(health_thread, &status);
178a0557
MD		 4002 if (ret) {
4003 errno = ret;
4004 PERROR("pthread_join health_thread");
4005 retval = -1;
65931c8b 4006 }
178a0557 4007exit_health_thread:
65931c8b 4008
65931c8b 4009 utils_close_pipe(health_quit_pipe);
178a0557 4010exit_health_quit_pipe:
65931c8b 4011
178a0557 4012exit_init_data:
55706a7d 4013 health_app_destroy(health_relayd);
55706a7d 4014exit_health_app_create:
178a0557 4015exit_options:
4d62fbf8
MD		 4016 /*
4017 * Wait for all pending call_rcu work to complete before tearing
4018 * down data structures. call_rcu worker may be trying to
4019 * perform lookups in those structures.
4020 */
4021 rcu_barrier();
7591bab1
MD		 4022 relayd_cleanup();
4023
4024 /* Ensure all prior call_rcu are done. */
4025 rcu_barrier();
d3e2ba59 4026
178a0557 4027 if (!retval) {
b8aa1682 4028 exit(EXIT_SUCCESS);
178a0557
MD		 4029 } else {
4030 exit(EXIT_FAILURE);
b8aa1682 4031 }
b8aa1682 4032}
LTTng 2.0 tools and control repository
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