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relayd: introduce --group-output-by-session
[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>
70626904 40#include <urcu/rculist.h>
b8aa1682
JD		 41#include <unistd.h>
42#include <fcntl.h>
f8be1183 43#include <strings.h>
b8aa1682
JD		 44
45#include <lttng/lttng.h>
46#include <common/common.h>
47#include <common/compat/poll.h>
48#include <common/compat/socket.h>
f263b7fd 49#include <common/compat/endian.h>
e8fa9fb0 50#include <common/compat/getenv.h>
b8aa1682 51#include <common/defaults.h>
3fd27398 52#include <common/daemonize.h>
b8aa1682
JD		 53#include <common/futex.h>
54#include <common/sessiond-comm/sessiond-comm.h>
55#include <common/sessiond-comm/inet.h>
b8aa1682
JD		 56#include <common/sessiond-comm/relayd.h>
57#include <common/uri.h>
a02de639 58#include <common/utils.h>
d3ecc550 59#include <common/align.h>
f40ef1d5 60#include <common/config/session-config.h>
5312a3ed
JG		 61#include <common/dynamic-buffer.h>
62#include <common/buffer-view.h>
70626904 63#include <common/string-utils/format.h>
b8aa1682 64
a3bc3918 65#include "version.h"
0f907de1 66#include "cmd.h"
d3e2ba59 67#include "ctf-trace.h"
1c20f0e2 68#include "index.h"
0f907de1 69#include "utils.h"
b8aa1682 70#include "lttng-relayd.h"
d3e2ba59 71#include "live.h"
55706a7d 72#include "health-relayd.h"
9b5e0863 73#include "testpoint.h"
2f8f53af 74#include "viewer-stream.h"
2a174661
DG		 75#include "session.h"
76#include "stream.h"
58eb9381 77#include "connection.h"
a44ca2ca 78#include "tracefile-array.h"
f056029c 79#include "tcp_keep_alive.h"
23c8ff50 80#include "sessiond-trace-chunks.h"
b8aa1682 81
4fc83d94
PP		 82static const char *help_msg =
83#ifdef LTTNG_EMBED_HELP
84#include <lttng-relayd.8.h>
85#else
86NULL
87#endif
88;
89
5569b118
JG		 90enum relay_connection_status {
91 RELAY_CONNECTION_STATUS_OK,
a9577b76 92 /* An error occurred while processing an event on the connection. */
5569b118
JG		 93 RELAY_CONNECTION_STATUS_ERROR,
94 /* Connection closed/shutdown cleanly. */
95 RELAY_CONNECTION_STATUS_CLOSED,
96};
97
b8aa1682 98/* command line options */
ce9ee1fb 99char *opt_output_path, *opt_working_directory;
a3bc3918 100static int opt_daemon, opt_background, opt_print_version;
a8b66566 101enum relay_group_output_by opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_UNKNOWN;
3fd27398
MD		 102
103/*
104 * We need to wait for listener and live listener threads, as well as
105 * health check thread, before being ready to signal readiness.
106 */
107#define NR_LTTNG_RELAY_READY 3
108static int lttng_relay_ready = NR_LTTNG_RELAY_READY;
0848dba7
MD		 109
110/* Size of receive buffer. */
111#define RECV_DATA_BUFFER_SIZE 65536
112
3fd27398
MD		 113static int recv_child_signal; /* Set to 1 when a SIGUSR1 signal is received. */
114static pid_t child_ppid; /* Internal parent PID use with daemonize. */
115
095a4ae5
MD		 116static struct lttng_uri *control_uri;
117static struct lttng_uri *data_uri;
d3e2ba59 118static struct lttng_uri *live_uri;
b8aa1682
JD		 119
120const char *progname;
b8aa1682 121
65931c8b 122const char *tracing_group_name = DEFAULT_TRACING_GROUP;
cd60b05a
JG		 123static int tracing_group_name_override;
124
125const char * const config_section_name = "relayd";
65931c8b 126
b8aa1682
JD		 127/*
128 * Quit pipe for all threads. This permits a single cancellation point
129 * for all threads when receiving an event on the pipe.
130 */
0b242f62 131int thread_quit_pipe[2] = { -1, -1 };
b8aa1682
JD		 132
133/*
134 * This pipe is used to inform the worker thread that a command is queued and
135 * ready to be processed.
136 */
58eb9381 137static int relay_conn_pipe[2] = { -1, -1 };
b8aa1682 138
26c9d55e 139/* Shared between threads */
b8aa1682
JD		 140static int dispatch_thread_exit;
141
142static pthread_t listener_thread;
143static pthread_t dispatcher_thread;
144static pthread_t worker_thread;
65931c8b 145static pthread_t health_thread;
b8aa1682 146
7591bab1
MD		 147/*
148 * last_relay_stream_id_lock protects last_relay_stream_id increment
149 * atomicity on 32-bit architectures.
150 */
151static pthread_mutex_t last_relay_stream_id_lock = PTHREAD_MUTEX_INITIALIZER;
095a4ae5 152static uint64_t last_relay_stream_id;
b8aa1682
JD		 153
154/*
155 * Relay command queue.
156 *
157 * The relay_thread_listener and relay_thread_dispatcher communicate with this
158 * queue.
159 */
58eb9381 160static struct relay_conn_queue relay_conn_queue;
b8aa1682 161
d3e2ba59
JD		 162/* Global relay stream hash table. */
163struct lttng_ht *relay_streams_ht;
164
92c6ca54
DG		 165/* Global relay viewer stream hash table. */
166struct lttng_ht *viewer_streams_ht;
167
7591bab1
MD		 168/* Global relay sessions hash table. */
169struct lttng_ht *sessions_ht;
0a6518b0 170
55706a7d 171/* Relayd health monitoring */
eea7556c 172struct health_app *health_relayd;
55706a7d 173
23c8ff50
JG		 174struct sessiond_trace_chunk_registry *sessiond_trace_chunk_registry;
175
cd60b05a
JG		 176static struct option long_options[] = {
177 { "control-port", 1, 0, 'C', },
178 { "data-port", 1, 0, 'D', },
8d5c808e 179 { "live-port", 1, 0, 'L', },
cd60b05a 180 { "daemonize", 0, 0, 'd', },
b5218ffb 181 { "background", 0, 0, 'b', },
cd60b05a
JG		 182 { "group", 1, 0, 'g', },
183 { "help", 0, 0, 'h', },
184 { "output", 1, 0, 'o', },
185 { "verbose", 0, 0, 'v', },
186 { "config", 1, 0, 'f' },
3a904098 187 { "version", 0, 0, 'V' },
ce9ee1fb 188 { "working-directory", 1, 0, 'w', },
a8b66566
JR		 189 { "group-output-by-session", 0, 0, 's', },
190 { "group-output-by-host", 0, 0, 'p', },
cd60b05a
JG		 191 { NULL, 0, 0, 0, },
192};
193
3a904098 194static const char *config_ignore_options[] = { "help", "config", "version" };
cd60b05a 195
a3bc3918
JR		 196static void print_version(void) {
197 fprintf(stdout, "%s\n", VERSION);
198}
199
200static void relayd_config_log(void)
201{
202 DBG("LTTng-relayd " VERSION " - " VERSION_NAME "%s%s",
203 GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION,
204 EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME);
205 if (EXTRA_VERSION_DESCRIPTION[0] != '\0') {
206 DBG("LTTng-relayd extra version description:\n\t" EXTRA_VERSION_DESCRIPTION "\n");
207 }
7f5ed73a
JR		 208 if (EXTRA_VERSION_PATCHES[0] != '\0') {
209 DBG("LTTng-relayd extra patches:\n\t" EXTRA_VERSION_PATCHES "\n");
210 }
a3bc3918
JR		 211}
212
cd60b05a
JG		 213/*
214 * Take an option from the getopt output and set it in the right variable to be
215 * used later.
216 *
217 * Return 0 on success else a negative value.
218 */
7591bab1 219static int set_option(int opt, const char *arg, const char *optname)
b8aa1682 220{
cd60b05a
JG		 221 int ret;
222
223 switch (opt) {
224 case 0:
225 fprintf(stderr, "option %s", optname);
226 if (arg) {
227 fprintf(stderr, " with arg %s\n", arg);
228 }
229 break;
230 case 'C':
e8fa9fb0
MD		 231 if (lttng_is_setuid_setgid()) {
232 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
233 "-C, --control-port");
234 } else {
235 ret = uri_parse(arg, &control_uri);
236 if (ret < 0) {
237 ERR("Invalid control URI specified");
238 goto end;
239 }
240 if (control_uri->port == 0) {
241 control_uri->port = DEFAULT_NETWORK_CONTROL_PORT;
242 }
cd60b05a
JG		 243 }
244 break;
245 case 'D':
e8fa9fb0
MD		 246 if (lttng_is_setuid_setgid()) {
247 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
248 "-D, -data-port");
249 } else {
250 ret = uri_parse(arg, &data_uri);
251 if (ret < 0) {
252 ERR("Invalid data URI specified");
253 goto end;
254 }
255 if (data_uri->port == 0) {
256 data_uri->port = DEFAULT_NETWORK_DATA_PORT;
257 }
cd60b05a
JG		 258 }
259 break;
8d5c808e 260 case 'L':
e8fa9fb0
MD		 261 if (lttng_is_setuid_setgid()) {
262 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
263 "-L, -live-port");
264 } else {
265 ret = uri_parse(arg, &live_uri);
266 if (ret < 0) {
267 ERR("Invalid live URI specified");
268 goto end;
269 }
270 if (live_uri->port == 0) {
271 live_uri->port = DEFAULT_NETWORK_VIEWER_PORT;
272 }
8d5c808e
AM		 273 }
274 break;
cd60b05a
JG		 275 case 'd':
276 opt_daemon = 1;
277 break;
b5218ffb
MD		 278 case 'b':
279 opt_background = 1;
280 break;
cd60b05a 281 case 'g':
e8fa9fb0
MD		 282 if (lttng_is_setuid_setgid()) {
283 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
284 "-g, --group");
285 } else {
286 tracing_group_name = strdup(arg);
287 if (tracing_group_name == NULL) {
288 ret = -errno;
289 PERROR("strdup");
290 goto end;
291 }
292 tracing_group_name_override = 1;
330a40bb 293 }
cd60b05a
JG		 294 break;
295 case 'h':
4fc83d94 296 ret = utils_show_help(8, "lttng-relayd", help_msg);
655b5cc1 297 if (ret) {
4fc83d94 298 ERR("Cannot show --help for `lttng-relayd`");
655b5cc1
PP		 299 perror("exec");
300 }
cd60b05a 301 exit(EXIT_FAILURE);
3a904098 302 case 'V':
a3bc3918
JR		 303 opt_print_version = 1;
304 break;
cd60b05a 305 case 'o':
e8fa9fb0
MD		 306 if (lttng_is_setuid_setgid()) {
307 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
308 "-o, --output");
309 } else {
310 ret = asprintf(&opt_output_path, "%s", arg);
311 if (ret < 0) {
312 ret = -errno;
313 PERROR("asprintf opt_output_path");
314 goto end;
315 }
cd60b05a
JG		 316 }
317 break;
ce9ee1fb
JR		 318 case 'w':
319 if (lttng_is_setuid_setgid()) {
320 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
321 "-w, --working-directory");
322 } else {
323 ret = asprintf(&opt_working_directory, "%s", arg);
324 if (ret < 0) {
325 ret = -errno;
326 PERROR("asprintf opt_working_directory");
327 goto end;
328 }
329 }
330 break;
331
cd60b05a
JG		 332 case 'v':
333 /* Verbose level can increase using multiple -v */
334 if (arg) {
335 lttng_opt_verbose = config_parse_value(arg);
336 } else {
849e5b7b
DG		 337 /* Only 3 level of verbosity (-vvv). */
338 if (lttng_opt_verbose < 3) {
339 lttng_opt_verbose += 1;
340 }
cd60b05a
JG		 341 }
342 break;
a8b66566
JR		 343 case 's':
344 if (opt_group_output_by != RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
345 ERR("Cannot set --group-output-by-session, another --group-output-by argument is present");
346 exit(EXIT_FAILURE);
347 }
348 opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_SESSION;
349 break;
350 case 'p':
351 if (opt_group_output_by != RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
352 ERR("Cannot set --group-output-by-host, another --group-output-by argument is present");
353 exit(EXIT_FAILURE);
354 }
355 opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
356 break;
cd60b05a
JG		 357 default:
358 /* Unknown option or other error.
359 * Error is printed by getopt, just return */
360 ret = -1;
361 goto end;
362 }
363
364 /* All good. */
365 ret = 0;
366
367end:
368 return ret;
369}
370
371/*
372 * config_entry_handler_cb used to handle options read from a config file.
f40ef1d5 373 * See config_entry_handler_cb comment in common/config/session-config.h for the
cd60b05a
JG		 374 * return value conventions.
375 */
7591bab1 376static int config_entry_handler(const struct config_entry *entry, void *unused)
cd60b05a
JG		 377{
378 int ret = 0, i;
379
380 if (!entry || !entry->name || !entry->value) {
381 ret = -EINVAL;
382 goto end;
383 }
384
385 /* Check if the option is to be ignored */
386 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
387 if (!strcmp(entry->name, config_ignore_options[i])) {
388 goto end;
389 }
390 }
391
392 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
393 /* Ignore if entry name is not fully matched. */
394 if (strcmp(entry->name, long_options[i].name)) {
395 continue;
396 }
397
398 /*
7591bab1
MD		 399 * If the option takes no argument on the command line,
400 * we have to check if the value is "true". We support
401 * non-zero numeric values, true, on and yes.
cd60b05a
JG		 402 */
403 if (!long_options[i].has_arg) {
404 ret = config_parse_value(entry->value);
405 if (ret <= 0) {
406 if (ret) {
407 WARN("Invalid configuration value \"%s\" for option %s",
408 entry->value, entry->name);
409 }
410 /* False, skip boolean config option. */
411 goto end;
412 }
413 }
414
415 ret = set_option(long_options[i].val, entry->value, entry->name);
416 goto end;
417 }
418
419 WARN("Unrecognized option \"%s\" in daemon configuration file.",
420 entry->name);
421
422end:
423 return ret;
424}
425
2a10de3b
JR		 426static int parse_env_options(void)
427{
428 int ret = 0;
429 char *value = NULL;
430
431 value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_WORKING_DIRECTORY_ENV);
432 if (value) {
433 opt_working_directory = strdup(value);
434 if (!opt_working_directory) {
435 ERR("Failed to allocate working directory string (\"%s\")",
436 value);
437 ret = -1;
438 }
439 }
440 return ret;
441}
442
7591bab1 443static int set_options(int argc, char **argv)
cd60b05a 444{
178a0557 445 int c, ret = 0, option_index = 0, retval = 0;
cd60b05a
JG		 446 int orig_optopt = optopt, orig_optind = optind;
447 char *default_address, *optstring;
448 const char *config_path = NULL;
449
450 optstring = utils_generate_optstring(long_options,
451 sizeof(long_options) / sizeof(struct option));
452 if (!optstring) {
178a0557 453 retval = -ENOMEM;
cd60b05a
JG		 454 goto exit;
455 }
456
457 /* Check for the --config option */
458
459 while ((c = getopt_long(argc, argv, optstring, long_options,
460 &option_index)) != -1) {
461 if (c == '?') {
178a0557 462 retval = -EINVAL;
cd60b05a
JG		 463 goto exit;
464 } else if (c != 'f') {
465 continue;
466 }
467
e8fa9fb0
MD		 468 if (lttng_is_setuid_setgid()) {
469 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
470 "-f, --config");
471 } else {
472 config_path = utils_expand_path(optarg);
473 if (!config_path) {
474 ERR("Failed to resolve path: %s", optarg);
475 }
cd60b05a
JG		 476 }
477 }
478
479 ret = config_get_section_entries(config_path, config_section_name,
480 config_entry_handler, NULL);
481 if (ret) {
482 if (ret > 0) {
483 ERR("Invalid configuration option at line %i", ret);
cd60b05a 484 }
178a0557 485 retval = -1;
cd60b05a
JG		 486 goto exit;
487 }
b8aa1682 488
cd60b05a
JG		 489 /* Reset getopt's global state */
490 optopt = orig_optopt;
491 optind = orig_optind;
b8aa1682 492 while (1) {
cd60b05a 493 c = getopt_long(argc, argv, optstring, long_options, &option_index);
b8aa1682
JD		 494 if (c == -1) {
495 break;
496 }
497
cd60b05a
JG		 498 ret = set_option(c, optarg, long_options[option_index].name);
499 if (ret < 0) {
178a0557 500 retval = -1;
b8aa1682
JD		 501 goto exit;
502 }
503 }
504
505 /* assign default values */
506 if (control_uri == NULL) {
fa91dc52
MD		 507 ret = asprintf(&default_address,
508 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS ":%d",
509 DEFAULT_NETWORK_CONTROL_PORT);
b8aa1682
JD		 510 if (ret < 0) {
511 PERROR("asprintf default data address");
178a0557 512 retval = -1;
b8aa1682
JD		 513 goto exit;
514 }
515
516 ret = uri_parse(default_address, &control_uri);
517 free(default_address);
518 if (ret < 0) {
519 ERR("Invalid control URI specified");
178a0557 520 retval = -1;
b8aa1682
JD		 521 goto exit;
522 }
523 }
524 if (data_uri == NULL) {
fa91dc52
MD		 525 ret = asprintf(&default_address,
526 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS ":%d",
527 DEFAULT_NETWORK_DATA_PORT);
b8aa1682
JD		 528 if (ret < 0) {
529 PERROR("asprintf default data address");
178a0557 530 retval = -1;
b8aa1682
JD		 531 goto exit;
532 }
533
534 ret = uri_parse(default_address, &data_uri);
535 free(default_address);
536 if (ret < 0) {
537 ERR("Invalid data URI specified");
178a0557 538 retval = -1;
b8aa1682
JD		 539 goto exit;
540 }
541 }
d3e2ba59 542 if (live_uri == NULL) {
fa91dc52
MD		 543 ret = asprintf(&default_address,
544 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS ":%d",
545 DEFAULT_NETWORK_VIEWER_PORT);
d3e2ba59
JD		 546 if (ret < 0) {
547 PERROR("asprintf default viewer control address");
178a0557 548 retval = -1;
d3e2ba59
JD		 549 goto exit;
550 }
551
552 ret = uri_parse(default_address, &live_uri);
553 free(default_address);
554 if (ret < 0) {
555 ERR("Invalid viewer control URI specified");
178a0557 556 retval = -1;
d3e2ba59
JD		 557 goto exit;
558 }
559 }
b8aa1682 560
a8b66566
JR		 561 if (opt_group_output_by == RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
562 opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
563 }
564
b8aa1682 565exit:
cd60b05a 566 free(optstring);
178a0557 567 return retval;
b8aa1682
JD		 568}
569
7591bab1
MD		 570static void print_global_objects(void)
571{
572 rcu_register_thread();
573
574 print_viewer_streams();
575 print_relay_streams();
576 print_sessions();
577
578 rcu_unregister_thread();
579}
580
b8aa1682
JD		 581/*
582 * Cleanup the daemon
583 */
7591bab1 584static void relayd_cleanup(void)
b8aa1682 585{
7591bab1
MD		 586 print_global_objects();
587
b8aa1682
JD		 588 DBG("Cleaning up");
589
178a0557
MD		 590 if (viewer_streams_ht)
591 lttng_ht_destroy(viewer_streams_ht);
592 if (relay_streams_ht)
593 lttng_ht_destroy(relay_streams_ht);
7591bab1
MD		 594 if (sessions_ht)
595 lttng_ht_destroy(sessions_ht);
178a0557 596
095a4ae5 597 free(opt_output_path);
ce9ee1fb 598 free(opt_working_directory);
095a4ae5 599
a02de639
CB		 600 /* Close thread quit pipes */
601 utils_close_pipe(thread_quit_pipe);
602
710c1f73
DG		 603 uri_free(control_uri);
604 uri_free(data_uri);
8d5c808e 605 /* Live URI is freed in the live thread. */
cd60b05a
JG		 606
607 if (tracing_group_name_override) {
608 free((void *) tracing_group_name);
609 }
b8aa1682
JD		 610}
611
612/*
613 * Write to writable pipe used to notify a thread.
614 */
7591bab1 615static int notify_thread_pipe(int wpipe)
b8aa1682 616{
6cd525e8 617 ssize_t ret;
b8aa1682 618
6cd525e8
MD		 619 ret = lttng_write(wpipe, "!", 1);
620 if (ret < 1) {
b8aa1682 621 PERROR("write poll pipe");
b4aacfdc 622 goto end;
b8aa1682 623 }
b4aacfdc
MD		 624 ret = 0;
625end:
b8aa1682
JD		 626 return ret;
627}
628
7591bab1 629static int notify_health_quit_pipe(int *pipe)
65931c8b 630{
6cd525e8 631 ssize_t ret;
65931c8b 632
6cd525e8
MD		 633 ret = lttng_write(pipe[1], "4", 1);
634 if (ret < 1) {
65931c8b 635 PERROR("write relay health quit");
b4aacfdc 636 goto end;
65931c8b 637 }
b4aacfdc
MD		 638 ret = 0;
639end:
640 return ret;
65931c8b
MD		 641}
642
b8aa1682 643/*
b4aacfdc 644 * Stop all relayd and relayd-live threads.
b8aa1682 645 */
b4aacfdc 646int lttng_relay_stop_threads(void)
b8aa1682 647{
b4aacfdc 648 int retval = 0;
b8aa1682
JD		 649
650 /* Stopping all threads */
651 DBG("Terminating all threads");
b4aacfdc 652 if (notify_thread_pipe(thread_quit_pipe[1])) {
b8aa1682 653 ERR("write error on thread quit pipe");
b4aacfdc 654 retval = -1;
b8aa1682
JD		 655 }
656
b4aacfdc
MD		 657 if (notify_health_quit_pipe(health_quit_pipe)) {
658 ERR("write error on health quit pipe");
659 }
65931c8b 660
b8aa1682 661 /* Dispatch thread */
26c9d55e 662 CMM_STORE_SHARED(dispatch_thread_exit, 1);
58eb9381 663 futex_nto1_wake(&relay_conn_queue.futex);
178a0557 664
b4aacfdc 665 if (relayd_live_stop()) {
178a0557 666 ERR("Error stopping live threads");
b4aacfdc 667 retval = -1;
178a0557 668 }
b4aacfdc 669 return retval;
b8aa1682
JD		 670}
671
672/*
673 * Signal handler for the daemon
674 *
675 * Simply stop all worker threads, leaving main() return gracefully after
676 * joining all threads and calling cleanup().
677 */
7591bab1 678static void sighandler(int sig)
b8aa1682
JD		 679{
680 switch (sig) {
b8aa1682
JD		 681 case SIGINT:
682 DBG("SIGINT caught");
b4aacfdc
MD		 683 if (lttng_relay_stop_threads()) {
684 ERR("Error stopping threads");
685 }
b8aa1682
JD		 686 break;
687 case SIGTERM:
688 DBG("SIGTERM caught");
b4aacfdc
MD		 689 if (lttng_relay_stop_threads()) {
690 ERR("Error stopping threads");
691 }
b8aa1682 692 break;
3fd27398
MD		 693 case SIGUSR1:
694 CMM_STORE_SHARED(recv_child_signal, 1);
695 break;
b8aa1682
JD		 696 default:
697 break;
698 }
699}
700
701/*
702 * Setup signal handler for :
703 * SIGINT, SIGTERM, SIGPIPE
704 */
7591bab1 705static int set_signal_handler(void)
b8aa1682
JD		 706{
707 int ret = 0;
708 struct sigaction sa;
709 sigset_t sigset;
710
711 if ((ret = sigemptyset(&sigset)) < 0) {
712 PERROR("sigemptyset");
713 return ret;
714 }
715
b8aa1682
JD		 716 sa.sa_mask = sigset;
717 sa.sa_flags = 0;
0072e5e2
MD		 718
719 sa.sa_handler = sighandler;
b8aa1682
JD		 720 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
721 PERROR("sigaction");
722 return ret;
723 }
724
725 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
726 PERROR("sigaction");
727 return ret;
728 }
729
0072e5e2 730 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
b8aa1682
JD		 731 PERROR("sigaction");
732 return ret;
733 }
734
0072e5e2
MD		 735 sa.sa_handler = SIG_IGN;
736 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3fd27398
MD		 737 PERROR("sigaction");
738 return ret;
739 }
740
741 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
b8aa1682
JD		 742
743 return ret;
744}
745
3fd27398
MD		 746void lttng_relay_notify_ready(void)
747{
748 /* Notify the parent of the fork() process that we are ready. */
749 if (opt_daemon || opt_background) {
750 if (uatomic_sub_return(&lttng_relay_ready, 1) == 0) {
751 kill(child_ppid, SIGUSR1);
752 }
753 }
754}
755
b8aa1682
JD		 756/*
757 * Init thread quit pipe.
758 *
759 * Return -1 on error or 0 if all pipes are created.
760 */
7591bab1 761static int init_thread_quit_pipe(void)
b8aa1682 762{
a02de639 763 int ret;
b8aa1682 764
a02de639 765 ret = utils_create_pipe_cloexec(thread_quit_pipe);
b8aa1682 766
b8aa1682
JD		 767 return ret;
768}
769
770/*
771 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
772 */
7591bab1 773static int create_thread_poll_set(struct lttng_poll_event *events, int size)
b8aa1682
JD		 774{
775 int ret;
776
777 if (events == NULL || size == 0) {
778 ret = -1;
779 goto error;
780 }
781
782 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
783 if (ret < 0) {
784 goto error;
785 }
786
787 /* Add quit pipe */
c7759e6a 788 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
b8aa1682
JD		 789 if (ret < 0) {
790 goto error;
791 }
792
793 return 0;
794
795error:
796 return ret;
797}
798
799/*
800 * Check if the thread quit pipe was triggered.
801 *
802 * Return 1 if it was triggered else 0;
803 */
7591bab1 804static int check_thread_quit_pipe(int fd, uint32_t events)
b8aa1682
JD		 805{
806 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
807 return 1;
808 }
809
810 return 0;
811}
812
813/*
814 * Create and init socket from uri.
815 */
7591bab1 816static struct lttcomm_sock *relay_socket_create(struct lttng_uri *uri)
b8aa1682
JD		 817{
818 int ret;
819 struct lttcomm_sock *sock = NULL;
820
821 sock = lttcomm_alloc_sock_from_uri(uri);
822 if (sock == NULL) {
823 ERR("Allocating socket");
824 goto error;
825 }
826
827 ret = lttcomm_create_sock(sock);
828 if (ret < 0) {
829 goto error;
830 }
831 DBG("Listening on sock %d", sock->fd);
832
833 ret = sock->ops->bind(sock);
834 if (ret < 0) {
2288467f 835 PERROR("Failed to bind socket");
b8aa1682
JD		 836 goto error;
837 }
838
839 ret = sock->ops->listen(sock, -1);
840 if (ret < 0) {
841 goto error;
842
843 }
844
845 return sock;
846
847error:
848 if (sock) {
849 lttcomm_destroy_sock(sock);
850 }
851 return NULL;
852}
853
854/*
855 * This thread manages the listening for new connections on the network
856 */
7591bab1 857static void *relay_thread_listener(void *data)
b8aa1682 858{
095a4ae5 859 int i, ret, pollfd, err = -1;
b8aa1682
JD		 860 uint32_t revents, nb_fd;
861 struct lttng_poll_event events;
862 struct lttcomm_sock *control_sock, *data_sock;
863
b8aa1682
JD		 864 DBG("[thread] Relay listener started");
865
55706a7d
MD		 866 health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
867
f385ae0a
MD		 868 health_code_update();
869
7591bab1 870 control_sock = relay_socket_create(control_uri);
b8aa1682 871 if (!control_sock) {
095a4ae5 872 goto error_sock_control;
b8aa1682
JD		 873 }
874
7591bab1 875 data_sock = relay_socket_create(data_uri);
b8aa1682 876 if (!data_sock) {
095a4ae5 877 goto error_sock_relay;
b8aa1682
JD		 878 }
879
880 /*
7591bab1
MD		 881 * Pass 3 as size here for the thread quit pipe, control and
882 * data socket.
b8aa1682
JD		 883 */
884 ret = create_thread_poll_set(&events, 3);
885 if (ret < 0) {
886 goto error_create_poll;
887 }
888
889 /* Add the control socket */
890 ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP);
891 if (ret < 0) {
892 goto error_poll_add;
893 }
894
895 /* Add the data socket */
896 ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP);
897 if (ret < 0) {
898 goto error_poll_add;
899 }
900
3fd27398
MD		 901 lttng_relay_notify_ready();
902
9b5e0863
MD		 903 if (testpoint(relayd_thread_listener)) {
904 goto error_testpoint;
905 }
906
b8aa1682 907 while (1) {
f385ae0a
MD		 908 health_code_update();
909
b8aa1682
JD		 910 DBG("Listener accepting connections");
911
b8aa1682 912restart:
f385ae0a 913 health_poll_entry();
b8aa1682 914 ret = lttng_poll_wait(&events, -1);
f385ae0a 915 health_poll_exit();
b8aa1682
JD		 916 if (ret < 0) {
917 /*
918 * Restart interrupted system call.
919 */
920 if (errno == EINTR) {
921 goto restart;
922 }
923 goto error;
924 }
925
0d9c5d77
DG		 926 nb_fd = ret;
927
b8aa1682
JD		 928 DBG("Relay new connection received");
929 for (i = 0; i < nb_fd; i++) {
f385ae0a
MD		 930 health_code_update();
931
b8aa1682
JD		 932 /* Fetch once the poll data */
933 revents = LTTNG_POLL_GETEV(&events, i);
934 pollfd = LTTNG_POLL_GETFD(&events, i);
935
936 /* Thread quit pipe has been closed. Killing thread. */
937 ret = check_thread_quit_pipe(pollfd, revents);
938 if (ret) {
095a4ae5
MD		 939 err = 0;
940 goto exit;
b8aa1682
JD		 941 }
942
03e43155 943 if (revents & LPOLLIN) {
4b7f17b2 944 /*
7591bab1
MD		 945 * A new connection is requested, therefore a
946 * sessiond/consumerd connection is allocated in
947 * this thread, enqueued to a global queue and
948 * dequeued (and freed) in the worker thread.
4b7f17b2 949 */
58eb9381
DG		 950 int val = 1;
951 struct relay_connection *new_conn;
4b7f17b2 952 struct lttcomm_sock *newsock;
7591bab1 953 enum connection_type type;
b8aa1682
JD		 954
955 if (pollfd == data_sock->fd) {
7591bab1 956 type = RELAY_DATA;
b8aa1682 957 newsock = data_sock->ops->accept(data_sock);
58eb9381
DG		 958 DBG("Relay data connection accepted, socket %d",
959 newsock->fd);
4b7f17b2
MD		 960 } else {
961 assert(pollfd == control_sock->fd);
7591bab1 962 type = RELAY_CONTROL;
b8aa1682 963 newsock = control_sock->ops->accept(control_sock);
58eb9381
DG		 964 DBG("Relay control connection accepted, socket %d",
965 newsock->fd);
b8aa1682 966 }
58eb9381
DG		 967 if (!newsock) {
968 PERROR("accepting sock");
58eb9381
DG		 969 goto error;
970 }
971
972 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
973 sizeof(val));
b8aa1682
JD		 974 if (ret < 0) {
975 PERROR("setsockopt inet");
4b7f17b2 976 lttcomm_destroy_sock(newsock);
b8aa1682
JD		 977 goto error;
978 }
f056029c
JR		 979
980 ret = socket_apply_keep_alive_config(newsock->fd);
981 if (ret < 0) {
982 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
983 newsock->fd);
984 lttcomm_destroy_sock(newsock);
985 goto error;
986 }
987
7591bab1
MD		 988 new_conn = connection_create(newsock, type);
989 if (!new_conn) {
990 lttcomm_destroy_sock(newsock);
991 goto error;
992 }
58eb9381
DG		 993
994 /* Enqueue request for the dispatcher thread. */
8bdee6e2
SM		 995 cds_wfcq_enqueue(&relay_conn_queue.head, &relay_conn_queue.tail,
996 &new_conn->qnode);
b8aa1682
JD		 997
998 /*
7591bab1
MD		 999 * Wake the dispatch queue futex.
1000 * Implicit memory barrier with the
1001 * exchange in cds_wfcq_enqueue.
b8aa1682 1002 */
58eb9381 1003 futex_nto1_wake(&relay_conn_queue.futex);
03e43155
MD		 1004 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1005 ERR("socket poll error");
1006 goto error;
1007 } else {
1008 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1009 goto error;
b8aa1682
JD		 1010 }
1011 }
1012 }
1013
095a4ae5 1014exit:
b8aa1682
JD		 1015error:
1016error_poll_add:
9b5e0863 1017error_testpoint:
b8aa1682
JD		 1018 lttng_poll_clean(&events);
1019error_create_poll:
095a4ae5
MD		 1020 if (data_sock->fd >= 0) {
1021 ret = data_sock->ops->close(data_sock);
b8aa1682
JD		 1022 if (ret) {
1023 PERROR("close");
1024 }
b8aa1682 1025 }
095a4ae5
MD		 1026 lttcomm_destroy_sock(data_sock);
1027error_sock_relay:
1028 if (control_sock->fd >= 0) {
1029 ret = control_sock->ops->close(control_sock);
b8aa1682
JD		 1030 if (ret) {
1031 PERROR("close");
1032 }
b8aa1682 1033 }
095a4ae5
MD		 1034 lttcomm_destroy_sock(control_sock);
1035error_sock_control:
1036 if (err) {
f385ae0a
MD		 1037 health_error();
1038 ERR("Health error occurred in %s", __func__);
095a4ae5 1039 }
55706a7d 1040 health_unregister(health_relayd);
b8aa1682 1041 DBG("Relay listener thread cleanup complete");
b4aacfdc 1042 lttng_relay_stop_threads();
b8aa1682
JD		 1043 return NULL;
1044}
1045
1046/*
1047 * This thread manages the dispatching of the requests to worker threads
1048 */
7591bab1 1049static void *relay_thread_dispatcher(void *data)
b8aa1682 1050{
6cd525e8
MD		 1051 int err = -1;
1052 ssize_t ret;
8bdee6e2 1053 struct cds_wfcq_node *node;
58eb9381 1054 struct relay_connection *new_conn = NULL;
b8aa1682
JD		 1055
1056 DBG("[thread] Relay dispatcher started");
1057
55706a7d
MD		 1058 health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER);
1059
9b5e0863
MD		 1060 if (testpoint(relayd_thread_dispatcher)) {
1061 goto error_testpoint;
1062 }
1063
f385ae0a
MD		 1064 health_code_update();
1065
0ed3b1a8 1066 for (;;) {
f385ae0a
MD		 1067 health_code_update();
1068
b8aa1682 1069 /* Atomically prepare the queue futex */
58eb9381 1070 futex_nto1_prepare(&relay_conn_queue.futex);
b8aa1682 1071
0ed3b1a8
MD		 1072 if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
1073 break;
1074 }
1075
b8aa1682 1076 do {
f385ae0a
MD		 1077 health_code_update();
1078
b8aa1682 1079 /* Dequeue commands */
8bdee6e2
SM		 1080 node = cds_wfcq_dequeue_blocking(&relay_conn_queue.head,
1081 &relay_conn_queue.tail);
b8aa1682
JD		 1082 if (node == NULL) {
1083 DBG("Woken up but nothing in the relay command queue");
1084 /* Continue thread execution */
1085 break;
1086 }
58eb9381 1087 new_conn = caa_container_of(node, struct relay_connection, qnode);
b8aa1682 1088
58eb9381 1089 DBG("Dispatching request waiting on sock %d", new_conn->sock->fd);
b8aa1682
JD		 1090
1091 /*
7591bab1
MD		 1092 * Inform worker thread of the new request. This
1093 * call is blocking so we can be assured that
1094 * the data will be read at some point in time
1095 * or wait to the end of the world :)
b8aa1682 1096 */
58eb9381
DG		 1097 ret = lttng_write(relay_conn_pipe[1], &new_conn, sizeof(new_conn));
1098 if (ret < 0) {
1099 PERROR("write connection pipe");
7591bab1 1100 connection_put(new_conn);
b8aa1682
JD		 1101 goto error;
1102 }
1103 } while (node != NULL);
1104
1105 /* Futex wait on queue. Blocking call on futex() */
f385ae0a 1106 health_poll_entry();
58eb9381 1107 futex_nto1_wait(&relay_conn_queue.futex);
f385ae0a 1108 health_poll_exit();
b8aa1682
JD		 1109 }
1110
f385ae0a
MD		 1111 /* Normal exit, no error */
1112 err = 0;
1113
b8aa1682 1114error:
9b5e0863 1115error_testpoint:
f385ae0a
MD		 1116 if (err) {
1117 health_error();
1118 ERR("Health error occurred in %s", __func__);
1119 }
55706a7d 1120 health_unregister(health_relayd);
b8aa1682 1121 DBG("Dispatch thread dying");
b4aacfdc 1122 lttng_relay_stop_threads();
b8aa1682
JD		 1123 return NULL;
1124}
1125
298a25ca
JG		 1126static bool session_streams_have_index(const struct relay_session *session)
1127{
1128 return session->minor >= 4 && !session->snapshot;
1129}
1130
c5b6f4f0
DG		 1131/*
1132 * Handle the RELAYD_CREATE_SESSION command.
1133 *
1134 * On success, send back the session id or else return a negative value.
1135 */
5312a3ed
JG		 1136static int relay_create_session(const struct lttcomm_relayd_hdr *recv_hdr,
1137 struct relay_connection *conn,
1138 const struct lttng_buffer_view *payload)
c5b6f4f0 1139{
5312a3ed
JG		 1140 int ret = 0;
1141 ssize_t send_ret;
4c6885d2 1142 struct relay_session *session = NULL;
ecd1a12f 1143 struct lttcomm_relayd_create_session_reply_2_11 reply = {};
1e791a74
JG		 1144 char session_name[LTTNG_NAME_MAX] = {};
1145 char hostname[LTTNG_HOST_NAME_MAX] = {};
7591bab1
MD		 1146 uint32_t live_timer = 0;
1147 bool snapshot = false;
46ef2188 1148 bool session_name_contains_creation_timestamp = false;
23c8ff50 1149 /* Left nil for peers < 2.11. */
6fa5fe7c 1150 char base_path[LTTNG_PATH_MAX] = {};
23c8ff50 1151 lttng_uuid sessiond_uuid = {};
1e791a74
JG		 1152 LTTNG_OPTIONAL(uint64_t) id_sessiond = {};
1153 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
db1da059 1154 LTTNG_OPTIONAL(time_t) creation_time = {};
ecd1a12f
MD		 1155 struct lttng_dynamic_buffer reply_payload;
1156
1157 lttng_dynamic_buffer_init(&reply_payload);
c5b6f4f0 1158
f86f6389
JR		 1159 if (conn->minor < 4) {
1160 /* From 2.1 to 2.3 */
1161 ret = 0;
1162 } else if (conn->minor >= 4 && conn->minor < 11) {
1163 /* From 2.4 to 2.10 */
5312a3ed 1164 ret = cmd_create_session_2_4(payload, session_name,
7591bab1 1165 hostname, &live_timer, &snapshot);
f86f6389 1166 } else {
84fa4db5 1167 bool has_current_chunk;
db1da059
JG		 1168 uint64_t current_chunk_id_value;
1169 time_t creation_time_value;
1170 uint64_t id_sessiond_value;
84fa4db5 1171
f86f6389 1172 /* From 2.11 to ... */
db1da059 1173 ret = cmd_create_session_2_11(payload, session_name, hostname,
6fa5fe7c 1174 base_path, &live_timer, &snapshot, &id_sessiond_value,
db1da059 1175 sessiond_uuid, &has_current_chunk,
46ef2188
MD		 1176 &current_chunk_id_value, &creation_time_value,
1177 &session_name_contains_creation_timestamp);
23c8ff50
JG		 1178 if (lttng_uuid_is_nil(sessiond_uuid)) {
1179 /* The nil UUID is reserved for pre-2.11 clients. */
1180 ERR("Illegal nil UUID announced by peer in create session command");
1181 ret = -1;
1182 goto send_reply;
1183 }
db1da059
JG		 1184 LTTNG_OPTIONAL_SET(&id_sessiond, id_sessiond_value);
1185 LTTNG_OPTIONAL_SET(&creation_time, creation_time_value);
1186 if (has_current_chunk) {
1187 LTTNG_OPTIONAL_SET(&current_chunk_id,
1188 current_chunk_id_value);
1189 }
7591bab1 1190 }
f86f6389 1191
7591bab1
MD		 1192 if (ret < 0) {
1193 goto send_reply;
d3e2ba59
JD		 1194 }
1195
6fa5fe7c 1196 session = session_create(session_name, hostname, base_path, live_timer,
1e791a74
JG		 1197 snapshot, sessiond_uuid,
1198 id_sessiond.is_set ? &id_sessiond.value : NULL,
1199 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
db1da059 1200 creation_time.is_set ? &creation_time.value : NULL,
46ef2188
MD		 1201 conn->major, conn->minor,
1202 session_name_contains_creation_timestamp);
7591bab1
MD		 1203 if (!session) {
1204 ret = -1;
1205 goto send_reply;
1206 }
1207 assert(!conn->session);
1208 conn->session = session;
c5b6f4f0
DG		 1209 DBG("Created session %" PRIu64, session->id);
1210
ecd1a12f 1211 reply.generic.session_id = htobe64(session->id);
7591bab1
MD		 1212
1213send_reply:
c5b6f4f0 1214 if (ret < 0) {
ecd1a12f 1215 reply.generic.ret_code = htobe32(LTTNG_ERR_FATAL);
c5b6f4f0 1216 } else {
ecd1a12f 1217 reply.generic.ret_code = htobe32(LTTNG_OK);
c5b6f4f0
DG		 1218 }
1219
ecd1a12f
MD		 1220 if (conn->minor < 11) {
1221 /* From 2.1 to 2.10 */
1222 ret = lttng_dynamic_buffer_append(&reply_payload,
1223 &reply.generic, sizeof(reply.generic));
1224 if (ret) {
1225 ERR("Failed to append \"create session\" command reply header to payload buffer");
1226 ret = -1;
1227 goto end;
1228 }
1229 } else {
1230 const uint32_t output_path_length =
8d382dd4 1231 session ? strlen(session->output_path) + 1 : 0;
ecd1a12f
MD		 1232
1233 reply.output_path_length = htobe32(output_path_length);
8d382dd4
JG		 1234 ret = lttng_dynamic_buffer_append(
1235 &reply_payload, &reply, sizeof(reply));
ecd1a12f
MD		 1236 if (ret) {
1237 ERR("Failed to append \"create session\" command reply header to payload buffer");
1238 goto end;
1239 }
1240
8d382dd4
JG		 1241 if (output_path_length) {
1242 ret = lttng_dynamic_buffer_append(&reply_payload,
1243 session->output_path,
1244 output_path_length);
1245 if (ret) {
1246 ERR("Failed to append \"create session\" command reply path to payload buffer");
1247 goto end;
1248 }
ecd1a12f
MD		 1249 }
1250 }
1251
1252 send_ret = conn->sock->ops->sendmsg(conn->sock, reply_payload.data,
1253 reply_payload.size, 0);
1254 if (send_ret < (ssize_t) reply_payload.size) {
1255 ERR("Failed to send \"create session\" command reply of %zu bytes (ret = %zd)",
1256 reply_payload.size, send_ret);
5312a3ed 1257 ret = -1;
c5b6f4f0 1258 }
ecd1a12f 1259end:
4c6885d2
JG		 1260 if (ret < 0 && session) {
1261 session_put(session);
1262 }
ecd1a12f 1263 lttng_dynamic_buffer_reset(&reply_payload);
c5b6f4f0
DG		 1264 return ret;
1265}
1266
a4baae1b
JD		 1267/*
1268 * When we have received all the streams and the metadata for a channel,
1269 * we make them visible to the viewer threads.
1270 */
7591bab1 1271static void publish_connection_local_streams(struct relay_connection *conn)
a4baae1b 1272{
7591bab1
MD		 1273 struct relay_stream *stream;
1274 struct relay_session *session = conn->session;
a4baae1b 1275
7591bab1
MD		 1276 /*
1277 * We publish all streams belonging to a session atomically wrt
1278 * session lock.
1279 */
1280 pthread_mutex_lock(&session->lock);
1281 rcu_read_lock();
1282 cds_list_for_each_entry_rcu(stream, &session->recv_list,
1283 recv_node) {
1284 stream_publish(stream);
a4baae1b 1285 }
7591bab1 1286 rcu_read_unlock();
a4baae1b 1287
7591bab1
MD		 1288 /*
1289 * Inform the viewer that there are new streams in the session.
1290 */
1291 if (session->viewer_attached) {
1292 uatomic_set(&session->new_streams, 1);
1293 }
1294 pthread_mutex_unlock(&session->lock);
a4baae1b
JD		 1295}
1296
348a81dc
JG		 1297static int conform_channel_path(char *channel_path)
1298{
1299 int ret = 0;
1300
1301 if (strstr("../", channel_path)) {
1302 ERR("Refusing channel path as it walks up the path hierarchy: \"%s\"",
1303 channel_path);
1304 ret = -1;
1305 goto end;
1306 }
1307
1308 if (*channel_path == '/') {
1309 const size_t len = strlen(channel_path);
1310
1311 /*
1312 * Channel paths from peers prior to 2.11 are expressed as an
1313 * absolute path that is, in reality, relative to the relay
1314 * daemon's output directory. Remove the leading slash so it
1315 * is correctly interpreted as a relative path later on.
1316 *
1317 * len (and not len - 1) is used to copy the trailing NULL.
1318 */
1319 bcopy(channel_path + 1, channel_path, len);
1320 }
1321end:
1322 return ret;
1323}
1324
b8aa1682
JD		 1325/*
1326 * relay_add_stream: allocate a new stream for a session
1327 */
5312a3ed
JG		 1328static int relay_add_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1329 struct relay_connection *conn,
1330 const struct lttng_buffer_view *payload)
b8aa1682 1331{
7591bab1
MD		 1332 int ret;
1333 ssize_t send_ret;
58eb9381 1334 struct relay_session *session = conn->session;
b8aa1682
JD		 1335 struct relay_stream *stream = NULL;
1336 struct lttcomm_relayd_status_stream reply;
4030a636 1337 struct ctf_trace *trace = NULL;
7591bab1
MD		 1338 uint64_t stream_handle = -1ULL;
1339 char *path_name = NULL, *channel_name = NULL;
1340 uint64_t tracefile_size = 0, tracefile_count = 0;
348a81dc 1341 LTTNG_OPTIONAL(uint64_t) stream_chunk_id = {};
b8aa1682 1342
5312a3ed 1343 if (!session || !conn->version_check_done) {
b8aa1682
JD		 1344 ERR("Trying to add a stream before version check");
1345 ret = -1;
1346 goto end_no_session;
1347 }
1348
2f21a469
JR		 1349 if (session->minor == 1) {
1350 /* For 2.1 */
5312a3ed 1351 ret = cmd_recv_stream_2_1(payload, &path_name,
7591bab1 1352 &channel_name);
2f21a469
JR		 1353 } else if (session->minor > 1 && session->minor < 11) {
1354 /* From 2.2 to 2.10 */
5312a3ed 1355 ret = cmd_recv_stream_2_2(payload, &path_name,
7591bab1 1356 &channel_name, &tracefile_size, &tracefile_count);
2f21a469
JR		 1357 } else {
1358 /* From 2.11 to ... */
1359 ret = cmd_recv_stream_2_11(payload, &path_name,
0b50e4b3
JG		 1360 &channel_name, &tracefile_size, &tracefile_count,
1361 &stream_chunk_id.value);
1362 stream_chunk_id.is_set = true;
0f907de1 1363 }
2f21a469 1364
0f907de1 1365 if (ret < 0) {
7591bab1 1366 goto send_reply;
b8aa1682
JD		 1367 }
1368
348a81dc
JG		 1369 if (conform_channel_path(path_name)) {
1370 goto send_reply;
1371 }
1372
7591bab1 1373 trace = ctf_trace_get_by_path_or_create(session, path_name);
2a174661 1374 if (!trace) {
7591bab1 1375 goto send_reply;
2a174661 1376 }
7591bab1 1377 /* This stream here has one reference on the trace. */
2a174661 1378
7591bab1
MD		 1379 pthread_mutex_lock(&last_relay_stream_id_lock);
1380 stream_handle = ++last_relay_stream_id;
1381 pthread_mutex_unlock(&last_relay_stream_id_lock);
d3e2ba59 1382
7591bab1
MD		 1383 /* We pass ownership of path_name and channel_name. */
1384 stream = stream_create(trace, stream_handle, path_name,
348a81dc 1385 channel_name, tracefile_size, tracefile_count);
7591bab1
MD		 1386 path_name = NULL;
1387 channel_name = NULL;
a4baae1b 1388
2a174661 1389 /*
7591bab1
MD		 1390 * Streams are the owners of their trace. Reference to trace is
1391 * kept within stream_create().
2a174661 1392 */
7591bab1 1393 ctf_trace_put(trace);
d3e2ba59 1394
7591bab1 1395send_reply:
53efb85a 1396 memset(&reply, 0, sizeof(reply));
7591bab1
MD		 1397 reply.handle = htobe64(stream_handle);
1398 if (!stream) {
f73fabfd 1399 reply.ret_code = htobe32(LTTNG_ERR_UNK);
b8aa1682 1400 } else {
f73fabfd 1401 reply.ret_code = htobe32(LTTNG_OK);
b8aa1682 1402 }
5af40280 1403
58eb9381 1404 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
b8aa1682 1405 sizeof(struct lttcomm_relayd_status_stream), 0);
5312a3ed
JG		 1406 if (send_ret < (ssize_t) sizeof(reply)) {
1407 ERR("Failed to send \"add stream\" command reply (ret = %zd)",
1408 send_ret);
1409 ret = -1;
b8aa1682
JD		 1410 }
1411
1412end_no_session:
7591bab1
MD		 1413 free(path_name);
1414 free(channel_name);
0f907de1 1415 return ret;
b8aa1682
JD		 1416}
1417
173af62f
DG		 1418/*
1419 * relay_close_stream: close a specific stream
1420 */
5312a3ed
JG		 1421static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1422 struct relay_connection *conn,
1423 const struct lttng_buffer_view *payload)
173af62f 1424{
5312a3ed
JG		 1425 int ret;
1426 ssize_t send_ret;
58eb9381 1427 struct relay_session *session = conn->session;
173af62f
DG		 1428 struct lttcomm_relayd_close_stream stream_info;
1429 struct lttcomm_relayd_generic_reply reply;
1430 struct relay_stream *stream;
173af62f
DG		 1431
1432 DBG("Close stream received");
1433
5312a3ed 1434 if (!session || !conn->version_check_done) {
173af62f
DG		 1435 ERR("Trying to close a stream before version check");
1436 ret = -1;
1437 goto end_no_session;
1438 }
1439
5312a3ed
JG		 1440 if (payload->size < sizeof(stream_info)) {
1441 ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
1442 sizeof(stream_info), payload->size);
173af62f
DG		 1443 ret = -1;
1444 goto end_no_session;
1445 }
5312a3ed
JG		 1446 memcpy(&stream_info, payload->data, sizeof(stream_info));
1447 stream_info.stream_id = be64toh(stream_info.stream_id);
1448 stream_info.last_net_seq_num = be64toh(stream_info.last_net_seq_num);
173af62f 1449
5312a3ed 1450 stream = stream_get_by_id(stream_info.stream_id);
173af62f
DG		 1451 if (!stream) {
1452 ret = -1;
7591bab1 1453 goto end;
173af62f 1454 }
77f7bd85
MD		 1455
1456 /*
1457 * Set last_net_seq_num before the close flag. Required by data
1458 * pending check.
1459 */
7591bab1 1460 pthread_mutex_lock(&stream->lock);
5312a3ed 1461 stream->last_net_seq_num = stream_info.last_net_seq_num;
77f7bd85
MD		 1462 pthread_mutex_unlock(&stream->lock);
1463
bda7c7b9
JG		 1464 /*
1465 * This is one of the conditions which may trigger a stream close
1466 * with the others being:
1467 * 1) A close command is received for a stream
1468 * 2) The control connection owning the stream is closed
1469 * 3) We have received all of the stream's data _after_ a close
1470 * request.
1471 */
1472 try_stream_close(stream);
7591bab1
MD		 1473 if (stream->is_metadata) {
1474 struct relay_viewer_stream *vstream;
173af62f 1475
7591bab1
MD		 1476 vstream = viewer_stream_get_by_id(stream->stream_handle);
1477 if (vstream) {
1478 if (vstream->metadata_sent == stream->metadata_received) {
1479 /*
1480 * Since all the metadata has been sent to the
1481 * viewer and that we have a request to close
1482 * its stream, we can safely teardown the
1483 * corresponding metadata viewer stream.
1484 */
1485 viewer_stream_put(vstream);
1486 }
1487 /* Put local reference. */
1488 viewer_stream_put(vstream);
1489 }
1490 }
7591bab1 1491 stream_put(stream);
5312a3ed 1492 ret = 0;
173af62f 1493
7591bab1 1494end:
53efb85a 1495 memset(&reply, 0, sizeof(reply));
173af62f 1496 if (ret < 0) {
f73fabfd 1497 reply.ret_code = htobe32(LTTNG_ERR_UNK);
173af62f 1498 } else {
f73fabfd 1499 reply.ret_code = htobe32(LTTNG_OK);
173af62f 1500 }
58eb9381 1501 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
173af62f 1502 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 1503 if (send_ret < (ssize_t) sizeof(reply)) {
1504 ERR("Failed to send \"close stream\" command reply (ret = %zd)",
1505 send_ret);
1506 ret = -1;
173af62f
DG		 1507 }
1508
1509end_no_session:
1510 return ret;
1511}
1512
93ec662e
JD		 1513/*
1514 * relay_reset_metadata: reset a metadata stream
1515 */
1516static
5312a3ed
JG		 1517int relay_reset_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1518 struct relay_connection *conn,
1519 const struct lttng_buffer_view *payload)
93ec662e 1520{
5312a3ed
JG		 1521 int ret;
1522 ssize_t send_ret;
93ec662e
JD		 1523 struct relay_session *session = conn->session;
1524 struct lttcomm_relayd_reset_metadata stream_info;
1525 struct lttcomm_relayd_generic_reply reply;
1526 struct relay_stream *stream;
1527
1528 DBG("Reset metadata received");
1529
5312a3ed 1530 if (!session || !conn->version_check_done) {
93ec662e
JD		 1531 ERR("Trying to reset a metadata stream before version check");
1532 ret = -1;
1533 goto end_no_session;
1534 }
1535
5312a3ed
JG		 1536 if (payload->size < sizeof(stream_info)) {
1537 ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
1538 sizeof(stream_info), payload->size);
93ec662e
JD		 1539 ret = -1;
1540 goto end_no_session;
1541 }
5312a3ed
JG		 1542 memcpy(&stream_info, payload->data, sizeof(stream_info));
1543 stream_info.stream_id = be64toh(stream_info.stream_id);
1544 stream_info.version = be64toh(stream_info.version);
1545
1546 DBG("Update metadata to version %" PRIu64, stream_info.version);
93ec662e
JD		 1547
1548 /* Unsupported for live sessions for now. */
1549 if (session->live_timer != 0) {
1550 ret = -1;
1551 goto end;
1552 }
1553
5312a3ed 1554 stream = stream_get_by_id(stream_info.stream_id);
93ec662e
JD		 1555 if (!stream) {
1556 ret = -1;
1557 goto end;
1558 }
1559 pthread_mutex_lock(&stream->lock);
1560 if (!stream->is_metadata) {
1561 ret = -1;
1562 goto end_unlock;
1563 }
1564
c35f9726 1565 ret = stream_reset_file(stream);
93ec662e 1566 if (ret < 0) {
c35f9726
JG		 1567 ERR("Failed to reset metadata stream %" PRIu64
1568 ": stream_path = %s, channel = %s",
1569 stream->stream_handle, stream->path_name,
1570 stream->channel_name);
93ec662e
JD		 1571 goto end_unlock;
1572 }
93ec662e
JD		 1573end_unlock:
1574 pthread_mutex_unlock(&stream->lock);
1575 stream_put(stream);
1576
1577end:
1578 memset(&reply, 0, sizeof(reply));
1579 if (ret < 0) {
1580 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1581 } else {
1582 reply.ret_code = htobe32(LTTNG_OK);
1583 }
1584 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1585 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 1586 if (send_ret < (ssize_t) sizeof(reply)) {
1587 ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
1588 send_ret);
1589 ret = -1;
93ec662e
JD		 1590 }
1591
1592end_no_session:
1593 return ret;
1594}
1595
b8aa1682
JD		 1596/*
1597 * relay_unknown_command: send -1 if received unknown command
1598 */
7591bab1 1599static void relay_unknown_command(struct relay_connection *conn)
b8aa1682
JD		 1600{
1601 struct lttcomm_relayd_generic_reply reply;
5312a3ed 1602 ssize_t send_ret;
b8aa1682 1603
53efb85a 1604 memset(&reply, 0, sizeof(reply));
f73fabfd 1605 reply.ret_code = htobe32(LTTNG_ERR_UNK);
5312a3ed
JG		 1606 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1607 if (send_ret < sizeof(reply)) {
1608 ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret);
b8aa1682
JD		 1609 }
1610}
1611
1612/*
1613 * relay_start: send an acknowledgment to the client to tell if we are
1614 * ready to receive data. We are ready if a session is established.
1615 */
5312a3ed
JG		 1616static int relay_start(const struct lttcomm_relayd_hdr *recv_hdr,
1617 struct relay_connection *conn,
1618 const struct lttng_buffer_view *payload)
b8aa1682 1619{
5312a3ed
JG		 1620 int ret = 0;
1621 ssize_t send_ret;
b8aa1682 1622 struct lttcomm_relayd_generic_reply reply;
58eb9381 1623 struct relay_session *session = conn->session;
b8aa1682
JD		 1624
1625 if (!session) {
1626 DBG("Trying to start the streaming without a session established");
f73fabfd 1627 ret = htobe32(LTTNG_ERR_UNK);
b8aa1682
JD		 1628 }
1629
53efb85a 1630 memset(&reply, 0, sizeof(reply));
5312a3ed
JG		 1631 reply.ret_code = htobe32(LTTNG_OK);
1632 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1633 sizeof(reply), 0);
1634 if (send_ret < (ssize_t) sizeof(reply)) {
1635 ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
1636 send_ret);
1637 ret = -1;
b8aa1682
JD		 1638 }
1639
1640 return ret;
1641}
1642
b8aa1682 1643/*
7591bab1 1644 * relay_recv_metadata: receive the metadata for the session.
b8aa1682 1645 */
5312a3ed
JG		 1646static int relay_recv_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1647 struct relay_connection *conn,
1648 const struct lttng_buffer_view *payload)
b8aa1682 1649{
32d1569c 1650 int ret = 0;
58eb9381 1651 struct relay_session *session = conn->session;
5312a3ed 1652 struct lttcomm_relayd_metadata_payload metadata_payload_header;
b8aa1682 1653 struct relay_stream *metadata_stream;
5312a3ed 1654 uint64_t metadata_payload_size;
c35f9726 1655 struct lttng_buffer_view packet_view;
b8aa1682
JD		 1656
1657 if (!session) {
1658 ERR("Metadata sent before version check");
1659 ret = -1;
1660 goto end;
1661 }
1662
5312a3ed 1663 if (recv_hdr->data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
f6416125
MD		 1664 ERR("Incorrect data size");
1665 ret = -1;
1666 goto end;
1667 }
5312a3ed
JG		 1668 metadata_payload_size = recv_hdr->data_size -
1669 sizeof(struct lttcomm_relayd_metadata_payload);
f6416125 1670
5312a3ed
JG		 1671 memcpy(&metadata_payload_header, payload->data,
1672 sizeof(metadata_payload_header));
1673 metadata_payload_header.stream_id = be64toh(
1674 metadata_payload_header.stream_id);
1675 metadata_payload_header.padding_size = be32toh(
1676 metadata_payload_header.padding_size);
9d1bbf21 1677
5312a3ed 1678 metadata_stream = stream_get_by_id(metadata_payload_header.stream_id);
b8aa1682
JD		 1679 if (!metadata_stream) {
1680 ret = -1;
7591bab1 1681 goto end;
b8aa1682
JD		 1682 }
1683
c35f9726
JG		 1684 packet_view = lttng_buffer_view_from_view(payload,
1685 sizeof(metadata_payload_header), metadata_payload_size);
1686 if (!packet_view.data) {
1687 ERR("Invalid metadata packet length announced by header");
b8aa1682 1688 ret = -1;
7591bab1 1689 goto end_put;
b8aa1682 1690 }
1d4dfdef 1691
c35f9726
JG		 1692 pthread_mutex_lock(&metadata_stream->lock);
1693 ret = stream_write(metadata_stream, &packet_view,
5312a3ed 1694 metadata_payload_header.padding_size);
c35f9726
JG		 1695 pthread_mutex_unlock(&metadata_stream->lock);
1696 if (ret){
5312a3ed 1697 ret = -1;
7591bab1 1698 goto end_put;
1d4dfdef 1699 }
7591bab1 1700end_put:
7591bab1 1701 stream_put(metadata_stream);
b8aa1682
JD		 1702end:
1703 return ret;
1704}
1705
1706/*
1707 * relay_send_version: send relayd version number
1708 */
5312a3ed
JG		 1709static int relay_send_version(const struct lttcomm_relayd_hdr *recv_hdr,
1710 struct relay_connection *conn,
1711 const struct lttng_buffer_view *payload)
b8aa1682 1712{
7f51dcba 1713 int ret;
5312a3ed 1714 ssize_t send_ret;
092b6259 1715 struct lttcomm_relayd_version reply, msg;
87cb6359 1716 bool compatible = true;
b8aa1682 1717
5312a3ed 1718 conn->version_check_done = true;
b8aa1682 1719
092b6259 1720 /* Get version from the other side. */
5312a3ed
JG		 1721 if (payload->size < sizeof(msg)) {
1722 ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
1723 sizeof(msg), payload->size);
092b6259 1724 ret = -1;
092b6259
DG		 1725 goto end;
1726 }
1727
5312a3ed
JG		 1728 memcpy(&msg, payload->data, sizeof(msg));
1729 msg.major = be32toh(msg.major);
1730 msg.minor = be32toh(msg.minor);
1731
53efb85a 1732 memset(&reply, 0, sizeof(reply));
d83a952c
MD		 1733 reply.major = RELAYD_VERSION_COMM_MAJOR;
1734 reply.minor = RELAYD_VERSION_COMM_MINOR;
d4519fa3
JD		 1735
1736 /* Major versions must be the same */
5312a3ed 1737 if (reply.major != msg.major) {
6151a90f 1738 DBG("Incompatible major versions (%u vs %u), deleting session",
5312a3ed 1739 reply.major, msg.major);
87cb6359 1740 compatible = false;
d4519fa3
JD		 1741 }
1742
58eb9381 1743 conn->major = reply.major;
0f907de1 1744 /* We adapt to the lowest compatible version */
5312a3ed 1745 if (reply.minor <= msg.minor) {
58eb9381 1746 conn->minor = reply.minor;
0f907de1 1747 } else {
5312a3ed 1748 conn->minor = msg.minor;
0f907de1
JD		 1749 }
1750
6151a90f
JD		 1751 reply.major = htobe32(reply.major);
1752 reply.minor = htobe32(reply.minor);
5312a3ed
JG		 1753 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1754 sizeof(reply), 0);
1755 if (send_ret < (ssize_t) sizeof(reply)) {
1756 ERR("Failed to send \"send version\" command reply (ret = %zd)",
1757 send_ret);
1758 ret = -1;
1759 goto end;
1760 } else {
1761 ret = 0;
6151a90f
JD		 1762 }
1763
87cb6359
JD		 1764 if (!compatible) {
1765 ret = -1;
1766 goto end;
1767 }
1768
58eb9381
DG		 1769 DBG("Version check done using protocol %u.%u", conn->major,
1770 conn->minor);
b8aa1682
JD		 1771
1772end:
1773 return ret;
1774}
1775
c8f59ee5 1776/*
6d805429 1777 * Check for data pending for a given stream id from the session daemon.
c8f59ee5 1778 */
5312a3ed
JG		 1779static int relay_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
1780 struct relay_connection *conn,
1781 const struct lttng_buffer_view *payload)
c8f59ee5 1782{
58eb9381 1783 struct relay_session *session = conn->session;
6d805429 1784 struct lttcomm_relayd_data_pending msg;
c8f59ee5
DG		 1785 struct lttcomm_relayd_generic_reply reply;
1786 struct relay_stream *stream;
5312a3ed 1787 ssize_t send_ret;
c8f59ee5 1788 int ret;
298a25ca 1789 uint64_t stream_seq;
c8f59ee5 1790
6d805429 1791 DBG("Data pending command received");
c8f59ee5 1792
5312a3ed 1793 if (!session || !conn->version_check_done) {
c8f59ee5
DG		 1794 ERR("Trying to check for data before version check");
1795 ret = -1;
1796 goto end_no_session;
1797 }
1798
5312a3ed
JG		 1799 if (payload->size < sizeof(msg)) {
1800 ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
1801 sizeof(msg), payload->size);
c8f59ee5
DG		 1802 ret = -1;
1803 goto end_no_session;
1804 }
5312a3ed
JG		 1805 memcpy(&msg, payload->data, sizeof(msg));
1806 msg.stream_id = be64toh(msg.stream_id);
1807 msg.last_net_seq_num = be64toh(msg.last_net_seq_num);
c8f59ee5 1808
5312a3ed 1809 stream = stream_get_by_id(msg.stream_id);
de91f48a 1810 if (stream == NULL) {
c8f59ee5 1811 ret = -1;
7591bab1 1812 goto end;
c8f59ee5
DG		 1813 }
1814
7591bab1
MD		 1815 pthread_mutex_lock(&stream->lock);
1816
298a25ca
JG		 1817 if (session_streams_have_index(session)) {
1818 /*
1819 * Ensure that both the index and stream data have been
1820 * flushed up to the requested point.
1821 */
a8f9f353 1822 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 1823 } else {
a8f9f353 1824 stream_seq = stream->prev_data_seq;
298a25ca 1825 }
a8f9f353 1826 DBG("Data pending for stream id %" PRIu64 ": prev_data_seq %" PRIu64
298a25ca
JG		 1827 ", prev_index_seq %" PRIu64
1828 ", and last_seq %" PRIu64, msg.stream_id,
a8f9f353 1829 stream->prev_data_seq, stream->prev_index_seq,
298a25ca 1830 msg.last_net_seq_num);
c8f59ee5 1831
33832e64 1832 /* Avoid wrapping issue */
298a25ca 1833 if (((int64_t) (stream_seq - msg.last_net_seq_num)) >= 0) {
6d805429 1834 /* Data has in fact been written and is NOT pending */
c8f59ee5 1835 ret = 0;
6d805429
DG		 1836 } else {
1837 /* Data still being streamed thus pending */
1838 ret = 1;
c8f59ee5
DG		 1839 }
1840
7591bab1
MD		 1841 stream->data_pending_check_done = true;
1842 pthread_mutex_unlock(&stream->lock);
f7079f67 1843
7591bab1
MD		 1844 stream_put(stream);
1845end:
c8f59ee5 1846
53efb85a 1847 memset(&reply, 0, sizeof(reply));
c8f59ee5 1848 reply.ret_code = htobe32(ret);
5312a3ed
JG		 1849 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1850 if (send_ret < (ssize_t) sizeof(reply)) {
1851 ERR("Failed to send \"data pending\" command reply (ret = %zd)",
1852 send_ret);
1853 ret = -1;
c8f59ee5
DG		 1854 }
1855
1856end_no_session:
1857 return ret;
1858}
1859
1860/*
1861 * Wait for the control socket to reach a quiescent state.
1862 *
7591bab1
MD		 1863 * Note that for now, when receiving this command from the session
1864 * daemon, this means that every subsequent commands or data received on
1865 * the control socket has been handled. So, this is why we simply return
1866 * OK here.
c8f59ee5 1867 */
5312a3ed
JG		 1868static int relay_quiescent_control(const struct lttcomm_relayd_hdr *recv_hdr,
1869 struct relay_connection *conn,
1870 const struct lttng_buffer_view *payload)
c8f59ee5
DG		 1871{
1872 int ret;
5312a3ed 1873 ssize_t send_ret;
ad7051c0 1874 struct relay_stream *stream;
ad7051c0 1875 struct lttcomm_relayd_quiescent_control msg;
c8f59ee5
DG		 1876 struct lttcomm_relayd_generic_reply reply;
1877
1878 DBG("Checking quiescent state on control socket");
1879
5312a3ed 1880 if (!conn->session || !conn->version_check_done) {
ad7051c0
DG		 1881 ERR("Trying to check for data before version check");
1882 ret = -1;
1883 goto end_no_session;
1884 }
1885
5312a3ed
JG		 1886 if (payload->size < sizeof(msg)) {
1887 ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
1888 sizeof(msg), payload->size);
ad7051c0
DG		 1889 ret = -1;
1890 goto end_no_session;
1891 }
5312a3ed
JG		 1892 memcpy(&msg, payload->data, sizeof(msg));
1893 msg.stream_id = be64toh(msg.stream_id);
ad7051c0 1894
5312a3ed 1895 stream = stream_get_by_id(msg.stream_id);
7591bab1
MD		 1896 if (!stream) {
1897 goto reply;
1898 }
1899 pthread_mutex_lock(&stream->lock);
1900 stream->data_pending_check_done = true;
1901 pthread_mutex_unlock(&stream->lock);
5312a3ed
JG		 1902
1903 DBG("Relay quiescent control pending flag set to %" PRIu64, msg.stream_id);
7591bab1
MD		 1904 stream_put(stream);
1905reply:
53efb85a 1906 memset(&reply, 0, sizeof(reply));
c8f59ee5 1907 reply.ret_code = htobe32(LTTNG_OK);
5312a3ed
JG		 1908 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1909 if (send_ret < (ssize_t) sizeof(reply)) {
1910 ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
1911 send_ret);
1912 ret = -1;
1913 } else {
1914 ret = 0;
c8f59ee5
DG		 1915 }
1916
ad7051c0 1917end_no_session:
c8f59ee5
DG		 1918 return ret;
1919}
1920
f7079f67 1921/*
7591bab1
MD		 1922 * Initialize a data pending command. This means that a consumer is about
1923 * to ask for data pending for each stream it holds. Simply iterate over
1924 * all streams of a session and set the data_pending_check_done flag.
f7079f67
DG		 1925 *
1926 * This command returns to the client a LTTNG_OK code.
1927 */
5312a3ed
JG		 1928static int relay_begin_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
1929 struct relay_connection *conn,
1930 const struct lttng_buffer_view *payload)
f7079f67
DG		 1931{
1932 int ret;
5312a3ed 1933 ssize_t send_ret;
f7079f67
DG		 1934 struct lttng_ht_iter iter;
1935 struct lttcomm_relayd_begin_data_pending msg;
1936 struct lttcomm_relayd_generic_reply reply;
1937 struct relay_stream *stream;
f7079f67
DG		 1938
1939 assert(recv_hdr);
58eb9381 1940 assert(conn);
f7079f67
DG		 1941
1942 DBG("Init streams for data pending");
1943
5312a3ed 1944 if (!conn->session || !conn->version_check_done) {
f7079f67
DG		 1945 ERR("Trying to check for data before version check");
1946 ret = -1;
1947 goto end_no_session;
1948 }
1949
5312a3ed
JG		 1950 if (payload->size < sizeof(msg)) {
1951 ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
1952 sizeof(msg), payload->size);
f7079f67
DG		 1953 ret = -1;
1954 goto end_no_session;
1955 }
5312a3ed
JG		 1956 memcpy(&msg, payload->data, sizeof(msg));
1957 msg.session_id = be64toh(msg.session_id);
f7079f67
DG		 1958
1959 /*
7591bab1
MD		 1960 * Iterate over all streams to set the begin data pending flag.
1961 * For now, the streams are indexed by stream handle so we have
1962 * to iterate over all streams to find the one associated with
1963 * the right session_id.
f7079f67
DG		 1964 */
1965 rcu_read_lock();
d3e2ba59 1966 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 1967 node.node) {
7591bab1
MD		 1968 if (!stream_get(stream)) {
1969 continue;
1970 }
5312a3ed 1971 if (stream->trace->session->id == msg.session_id) {
7591bab1
MD		 1972 pthread_mutex_lock(&stream->lock);
1973 stream->data_pending_check_done = false;
1974 pthread_mutex_unlock(&stream->lock);
f7079f67
DG		 1975 DBG("Set begin data pending flag to stream %" PRIu64,
1976 stream->stream_handle);
1977 }
7591bab1 1978 stream_put(stream);
f7079f67
DG		 1979 }
1980 rcu_read_unlock();
1981
53efb85a 1982 memset(&reply, 0, sizeof(reply));
f7079f67
DG		 1983 /* All good, send back reply. */
1984 reply.ret_code = htobe32(LTTNG_OK);
1985
5312a3ed
JG		 1986 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1987 if (send_ret < (ssize_t) sizeof(reply)) {
1988 ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
1989 send_ret);
1990 ret = -1;
1991 } else {
1992 ret = 0;
f7079f67
DG		 1993 }
1994
1995end_no_session:
1996 return ret;
1997}
1998
1999/*
7591bab1
MD		 2000 * End data pending command. This will check, for a given session id, if
2001 * each stream associated with it has its data_pending_check_done flag
2002 * set. If not, this means that the client lost track of the stream but
2003 * the data is still being streamed on our side. In this case, we inform
2004 * the client that data is in flight.
f7079f67
DG		 2005 *
2006 * Return to the client if there is data in flight or not with a ret_code.
2007 */
5312a3ed
JG		 2008static int relay_end_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2009 struct relay_connection *conn,
2010 const struct lttng_buffer_view *payload)
f7079f67
DG		 2011{
2012 int ret;
5312a3ed 2013 ssize_t send_ret;
f7079f67
DG		 2014 struct lttng_ht_iter iter;
2015 struct lttcomm_relayd_end_data_pending msg;
2016 struct lttcomm_relayd_generic_reply reply;
2017 struct relay_stream *stream;
f7079f67
DG		 2018 uint32_t is_data_inflight = 0;
2019
f7079f67
DG		 2020 DBG("End data pending command");
2021
5312a3ed 2022 if (!conn->session || !conn->version_check_done) {
f7079f67
DG		 2023 ERR("Trying to check for data before version check");
2024 ret = -1;
2025 goto end_no_session;
2026 }
2027
5312a3ed
JG		 2028 if (payload->size < sizeof(msg)) {
2029 ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
2030 sizeof(msg), payload->size);
f7079f67
DG		 2031 ret = -1;
2032 goto end_no_session;
2033 }
5312a3ed
JG		 2034 memcpy(&msg, payload->data, sizeof(msg));
2035 msg.session_id = be64toh(msg.session_id);
f7079f67 2036
7591bab1
MD		 2037 /*
2038 * Iterate over all streams to see if the begin data pending
2039 * flag is set.
2040 */
f7079f67 2041 rcu_read_lock();
d3e2ba59 2042 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2043 node.node) {
7591bab1
MD		 2044 if (!stream_get(stream)) {
2045 continue;
2046 }
5312a3ed 2047 if (stream->trace->session->id != msg.session_id) {
7591bab1
MD		 2048 stream_put(stream);
2049 continue;
2050 }
2051 pthread_mutex_lock(&stream->lock);
2052 if (!stream->data_pending_check_done) {
298a25ca
JG		 2053 uint64_t stream_seq;
2054
2055 if (session_streams_have_index(conn->session)) {
2056 /*
2057 * Ensure that both the index and stream data have been
2058 * flushed up to the requested point.
2059 */
a8f9f353 2060 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 2061 } else {
a8f9f353 2062 stream_seq = stream->prev_data_seq;
298a25ca
JG		 2063 }
2064 if (!stream->closed || !(((int64_t) (stream_seq - stream->last_net_seq_num)) >= 0)) {
7591bab1
MD		 2065 is_data_inflight = 1;
2066 DBG("Data is still in flight for stream %" PRIu64,
2067 stream->stream_handle);
2068 pthread_mutex_unlock(&stream->lock);
2069 stream_put(stream);
2070 break;
2071 }
f7079f67 2072 }
7591bab1
MD		 2073 pthread_mutex_unlock(&stream->lock);
2074 stream_put(stream);
f7079f67
DG		 2075 }
2076 rcu_read_unlock();
2077
53efb85a 2078 memset(&reply, 0, sizeof(reply));
f7079f67
DG		 2079 /* All good, send back reply. */
2080 reply.ret_code = htobe32(is_data_inflight);
2081
5312a3ed
JG		 2082 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2083 if (send_ret < (ssize_t) sizeof(reply)) {
2084 ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
2085 send_ret);
2086 ret = -1;
2087 } else {
2088 ret = 0;
f7079f67
DG		 2089 }
2090
2091end_no_session:
2092 return ret;
2093}
2094
1c20f0e2
JD		 2095/*
2096 * Receive an index for a specific stream.
2097 *
2098 * Return 0 on success else a negative value.
2099 */
5312a3ed
JG		 2100static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
2101 struct relay_connection *conn,
2102 const struct lttng_buffer_view *payload)
1c20f0e2 2103{
5312a3ed
JG		 2104 int ret;
2105 ssize_t send_ret;
58eb9381 2106 struct relay_session *session = conn->session;
1c20f0e2 2107 struct lttcomm_relayd_index index_info;
1c20f0e2
JD		 2108 struct lttcomm_relayd_generic_reply reply;
2109 struct relay_stream *stream;
f8f3885c 2110 size_t msg_len;
1c20f0e2 2111
58eb9381 2112 assert(conn);
1c20f0e2
JD		 2113
2114 DBG("Relay receiving index");
2115
5312a3ed 2116 if (!session || !conn->version_check_done) {
1c20f0e2
JD		 2117 ERR("Trying to close a stream before version check");
2118 ret = -1;
2119 goto end_no_session;
2120 }
2121
f8f3885c
MD		 2122 msg_len = lttcomm_relayd_index_len(
2123 lttng_to_index_major(conn->major, conn->minor),
2124 lttng_to_index_minor(conn->major, conn->minor));
5312a3ed
JG		 2125 if (payload->size < msg_len) {
2126 ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
2127 msg_len, payload->size);
1c20f0e2
JD		 2128 ret = -1;
2129 goto end_no_session;
2130 }
5312a3ed
JG		 2131 memcpy(&index_info, payload->data, msg_len);
2132 index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
2133 index_info.net_seq_num = be64toh(index_info.net_seq_num);
2134 index_info.packet_size = be64toh(index_info.packet_size);
2135 index_info.content_size = be64toh(index_info.content_size);
2136 index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
2137 index_info.timestamp_end = be64toh(index_info.timestamp_end);
2138 index_info.events_discarded = be64toh(index_info.events_discarded);
2139 index_info.stream_id = be64toh(index_info.stream_id);
81df238b
JR		 2140
2141 if (conn->minor >= 8) {
2142 index_info.stream_instance_id =
2143 be64toh(index_info.stream_instance_id);
2144 index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
2145 }
5312a3ed
JG		 2146
2147 stream = stream_get_by_id(index_info.relay_stream_id);
1c20f0e2 2148 if (!stream) {
7591bab1 2149 ERR("stream_get_by_id not found");
1c20f0e2 2150 ret = -1;
7591bab1 2151 goto end;
1c20f0e2 2152 }
d3e2ba59 2153
c35f9726
JG		 2154 pthread_mutex_lock(&stream->lock);
2155 ret = stream_add_index(stream, &index_info);
2156 pthread_mutex_unlock(&stream->lock);
2157 if (ret) {
7591bab1
MD		 2158 goto end_stream_put;
2159 }
1c20f0e2 2160
7591bab1 2161end_stream_put:
7591bab1 2162 stream_put(stream);
7591bab1 2163end:
53efb85a 2164 memset(&reply, 0, sizeof(reply));
1c20f0e2
JD		 2165 if (ret < 0) {
2166 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2167 } else {
2168 reply.ret_code = htobe32(LTTNG_OK);
2169 }
58eb9381 2170 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 2171 if (send_ret < (ssize_t) sizeof(reply)) {
2172 ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
2173 ret = -1;
1c20f0e2
JD		 2174 }
2175
2176end_no_session:
2177 return ret;
2178}
2179
a4baae1b
JD		 2180/*
2181 * Receive the streams_sent message.
2182 *
2183 * Return 0 on success else a negative value.
2184 */
5312a3ed
JG		 2185static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
2186 struct relay_connection *conn,
2187 const struct lttng_buffer_view *payload)
a4baae1b 2188{
5312a3ed
JG		 2189 int ret;
2190 ssize_t send_ret;
a4baae1b
JD		 2191 struct lttcomm_relayd_generic_reply reply;
2192
58eb9381 2193 assert(conn);
a4baae1b
JD		 2194
2195 DBG("Relay receiving streams_sent");
2196
5312a3ed 2197 if (!conn->session || !conn->version_check_done) {
a4baae1b
JD		 2198 ERR("Trying to close a stream before version check");
2199 ret = -1;
2200 goto end_no_session;
2201 }
2202
2203 /*
7591bab1
MD		 2204 * Publish every pending stream in the connection recv list which are
2205 * now ready to be used by the viewer.
4a9daf17 2206 */
7591bab1 2207 publish_connection_local_streams(conn);
4a9daf17 2208
53efb85a 2209 memset(&reply, 0, sizeof(reply));
a4baae1b 2210 reply.ret_code = htobe32(LTTNG_OK);
58eb9381 2211 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG		 2212 if (send_ret < (ssize_t) sizeof(reply)) {
2213 ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
2214 send_ret);
2215 ret = -1;
a4baae1b
JD		 2216 } else {
2217 /* Success. */
2218 ret = 0;
2219 }
2220
2221end_no_session:
2222 return ret;
2223}
2224
d3ecc550 2225/*
c35f9726
JG		 2226 * relay_rotate_session_stream: rotate a stream to a new tracefile for the
2227 * session rotation feature (not the tracefile rotation feature).
d3ecc550 2228 */
c35f9726
JG		 2229static int relay_rotate_session_streams(
2230 const struct lttcomm_relayd_hdr *recv_hdr,
5312a3ed
JG		 2231 struct relay_connection *conn,
2232 const struct lttng_buffer_view *payload)
d3ecc550 2233{
30b9d5ab 2234 int ret = 0;
c35f9726 2235 uint32_t i;
5312a3ed 2236 ssize_t send_ret;
c35f9726 2237 enum lttng_error_code reply_code = LTTNG_ERR_UNK;
d3ecc550 2238 struct relay_session *session = conn->session;
c35f9726
JG		 2239 struct lttcomm_relayd_rotate_streams rotate_streams;
2240 struct lttcomm_relayd_generic_reply reply = {};
2241 struct relay_stream *stream = NULL;
2242 const size_t header_len = sizeof(struct lttcomm_relayd_rotate_streams);
2243 struct lttng_trace_chunk *next_trace_chunk = NULL;
2244 struct lttng_buffer_view stream_positions;
70626904
JG		 2245 char chunk_id_buf[MAX_INT_DEC_LEN(uint64_t)];
2246 const char *chunk_id_str = "none";
d3ecc550 2247
d3ecc550
JD		 2248 if (!session || !conn->version_check_done) {
2249 ERR("Trying to rotate a stream before version check");
2250 ret = -1;
2251 goto end_no_reply;
2252 }
2253
2254 if (session->major == 2 && session->minor < 11) {
2255 ERR("Unsupported feature before 2.11");
2256 ret = -1;
2257 goto end_no_reply;
2258 }
2259
5312a3ed
JG		 2260 if (payload->size < header_len) {
2261 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
2262 header_len, payload->size);
d3ecc550
JD		 2263 ret = -1;
2264 goto end_no_reply;
2265 }
2266
c35f9726 2267 memcpy(&rotate_streams, payload->data, header_len);
5312a3ed 2268
c35f9726
JG		 2269 /* Convert header to host endianness. */
2270 rotate_streams = (typeof(rotate_streams)) {
2271 .stream_count = be32toh(rotate_streams.stream_count),
2272 .new_chunk_id = (typeof(rotate_streams.new_chunk_id)) {
2273 .is_set = !!rotate_streams.new_chunk_id.is_set,
2274 .value = be64toh(rotate_streams.new_chunk_id.value),
2275 }
2276 };
d3ecc550 2277
c35f9726
JG		 2278 if (rotate_streams.new_chunk_id.is_set) {
2279 /*
2280 * Retrieve the trace chunk the stream must transition to. As
2281 * per the protocol, this chunk should have been created
2282 * before this command is received.
2283 */
2284 next_trace_chunk = sessiond_trace_chunk_registry_get_chunk(
2285 sessiond_trace_chunk_registry,
2286 session->sessiond_uuid, session->id,
2287 rotate_streams.new_chunk_id.value);
2288 if (!next_trace_chunk) {
2289 char uuid_str[UUID_STR_LEN];
2290
2291 lttng_uuid_to_str(session->sessiond_uuid, uuid_str);
2292 ERR("Unknown next trace chunk in ROTATE_STREAMS command: sessiond_uuid = {%s}, session_id = %" PRIu64
2293 ", trace_chunk_id = %" PRIu64,
2294 uuid_str, session->id,
2295 rotate_streams.new_chunk_id.value);
2296 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2297 ret = -1;
2298 goto end;
2299 }
70626904
JG		 2300
2301 ret = snprintf(chunk_id_buf, sizeof(chunk_id_buf), "%" PRIu64,
2302 rotate_streams.new_chunk_id.value);
2303 if (ret < 0 || ret >= sizeof(chunk_id_buf)) {
2304 chunk_id_str = "formatting error";
2305 } else {
2306 chunk_id_str = chunk_id_buf;
2307 }
ecd1a12f 2308 session->has_rotated = true;
d3ecc550
JD		 2309 }
2310
70626904
JG		 2311 DBG("Rotate %" PRIu32 " streams of session \"%s\" to chunk \"%s\"",
2312 rotate_streams.stream_count, session->session_name,
2313 chunk_id_str);
2314
c35f9726
JG		 2315 stream_positions = lttng_buffer_view_from_view(payload,
2316 sizeof(rotate_streams), -1);
2317 if (!stream_positions.data ||
2318 stream_positions.size <
2319 (rotate_streams.stream_count *
2320 sizeof(struct lttcomm_relayd_stream_rotation_position))) {
2321 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
d3ecc550 2322 ret = -1;
5312a3ed 2323 goto end;
d3ecc550
JD		 2324 }
2325
c35f9726
JG		 2326 for (i = 0; i < rotate_streams.stream_count; i++) {
2327 struct lttcomm_relayd_stream_rotation_position *position_comm =
2328 &((typeof(position_comm)) stream_positions.data)[i];
2329 const struct lttcomm_relayd_stream_rotation_position pos = {
2330 .stream_id = be64toh(position_comm->stream_id),
2331 .rotate_at_seq_num = be64toh(
2332 position_comm->rotate_at_seq_num),
2333 };
5312a3ed 2334
c35f9726
JG		 2335 stream = stream_get_by_id(pos.stream_id);
2336 if (!stream) {
2337 reply_code = LTTNG_ERR_INVALID;
2338 ret = -1;
2339 goto end;
c6db3843
JG		 2340 }
2341
c35f9726
JG		 2342 pthread_mutex_lock(&stream->lock);
2343 ret = stream_set_pending_rotation(stream, next_trace_chunk,
2344 pos.rotate_at_seq_num);
2345 pthread_mutex_unlock(&stream->lock);
2346 if (ret) {
2347 reply_code = LTTNG_ERR_FILE_CREATION_ERROR;
2348 goto end;
c6db3843 2349 }
c35f9726
JG		 2350
2351 stream_put(stream);
2352 stream = NULL;
d3ecc550
JD		 2353 }
2354
c35f9726 2355 reply_code = LTTNG_OK;
eaeb64a9 2356 ret = 0;
d3ecc550 2357end:
c35f9726
JG		 2358 if (stream) {
2359 stream_put(stream);
d3ecc550 2360 }
c35f9726
JG		 2361
2362 reply.ret_code = htobe32((uint32_t) reply_code);
d3ecc550
JD		 2363 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2364 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG		 2365 if (send_ret < (ssize_t) sizeof(reply)) {
2366 ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
2367 send_ret);
2368 ret = -1;
d3ecc550 2369 }
d3ecc550 2370end_no_reply:
c35f9726 2371 lttng_trace_chunk_put(next_trace_chunk);
d3ecc550
JD		 2372 return ret;
2373}
2374
e5add6d0 2375
e5add6d0
JG		 2376
2377/*
2378 * relay_create_trace_chunk: create a new trace chunk
2379 */
2380static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
2381 struct relay_connection *conn,
2382 const struct lttng_buffer_view *payload)
2383{
2384 int ret = 0;
2385 ssize_t send_ret;
2386 struct relay_session *session = conn->session;
2387 struct lttcomm_relayd_create_trace_chunk *msg;
2388 struct lttcomm_relayd_generic_reply reply = {};
2389 struct lttng_buffer_view header_view;
2390 struct lttng_buffer_view chunk_name_view;
2391 struct lttng_trace_chunk *chunk = NULL, *published_chunk = NULL;
2392 enum lttng_error_code reply_code = LTTNG_OK;
2393 enum lttng_trace_chunk_status chunk_status;
2394 struct lttng_directory_handle session_output;
2395
2396 if (!session || !conn->version_check_done) {
2397 ERR("Trying to create a trace chunk before version check");
2398 ret = -1;
2399 goto end_no_reply;
2400 }
2401
2402 if (session->major == 2 && session->minor < 11) {
2403 ERR("Chunk creation command is unsupported before 2.11");
2404 ret = -1;
2405 goto end_no_reply;
2406 }
2407
2408 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2409 if (!header_view.data) {
2410 ERR("Failed to receive payload of chunk creation command");
2411 ret = -1;
2412 goto end_no_reply;
2413 }
2414
2415 /* Convert to host endianness. */
2416 msg = (typeof(msg)) header_view.data;
2417 msg->chunk_id = be64toh(msg->chunk_id);
2418 msg->creation_timestamp = be64toh(msg->creation_timestamp);
2419 msg->override_name_length = be32toh(msg->override_name_length);
2420
2421 chunk = lttng_trace_chunk_create(
2422 msg->chunk_id, msg->creation_timestamp);
2423 if (!chunk) {
2424 ERR("Failed to create trace chunk in trace chunk creation command");
2425 ret = -1;
2426 reply_code = LTTNG_ERR_NOMEM;
2427 goto end;
2428 }
2429
2430 if (msg->override_name_length) {
2431 const char *name;
2432
2433 chunk_name_view = lttng_buffer_view_from_view(payload,
2434 sizeof(*msg),
2435 msg->override_name_length);
2436 name = chunk_name_view.data;
2437 if (!name || name[msg->override_name_length - 1]) {
2438 ERR("Failed to receive payload of chunk creation command");
2439 ret = -1;
2440 reply_code = LTTNG_ERR_INVALID;
2441 goto end;
2442 }
2443
2444 chunk_status = lttng_trace_chunk_override_name(
2445 chunk, chunk_name_view.data);
2446 switch (chunk_status) {
2447 case LTTNG_TRACE_CHUNK_STATUS_OK:
2448 break;
2449 case LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT:
2450 ERR("Failed to set the name of new trace chunk in trace chunk creation command (invalid name)");
2451 reply_code = LTTNG_ERR_INVALID;
2452 ret = -1;
2453 goto end;
2454 default:
2455 ERR("Failed to set the name of new trace chunk in trace chunk creation command (unknown error)");
2456 reply_code = LTTNG_ERR_UNK;
2457 ret = -1;
2458 goto end;
2459 }
2460 }
2461
e5add6d0
JG		 2462 chunk_status = lttng_trace_chunk_set_credentials_current_user(chunk);
2463 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2464 reply_code = LTTNG_ERR_UNK;
2465 ret = -1;
2466 goto end;
2467 }
2468
0ccc0411
JG		 2469 ret = session_init_output_directory_handle(
2470 conn->session, &session_output);
2471 if (ret) {
2472 reply_code = LTTNG_ERR_CREATE_DIR_FAIL;
2473 goto end;
2474 }
e5add6d0 2475 chunk_status = lttng_trace_chunk_set_as_owner(chunk, &session_output);
0ccc0411 2476 lttng_directory_handle_fini(&session_output);
e5add6d0
JG		 2477 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2478 reply_code = LTTNG_ERR_UNK;
2479 ret = -1;
2480 goto end;
2481 }
2482
2483 published_chunk = sessiond_trace_chunk_registry_publish_chunk(
2484 sessiond_trace_chunk_registry,
2485 conn->session->sessiond_uuid,
2486 conn->session->id,
2487 chunk);
2488 if (!published_chunk) {
2489 char uuid_str[UUID_STR_LEN];
2490
2491 lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
2492 ERR("Failed to publish chunk: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
2493 uuid_str,
2494 conn->session->id,
2495 msg->chunk_id);
2496 ret = -1;
2497 reply_code = LTTNG_ERR_NOMEM;
2498 goto end;
2499 }
2500
2501 pthread_mutex_lock(&conn->session->lock);
62bad3bf
JG		 2502 if (conn->session->pending_closure_trace_chunk) {
2503 /*
2504 * Invalid; this means a second create_trace_chunk command was
2505 * received before a close_trace_chunk.
2506 */
2507 ERR("Invalid trace chunk close command received; a trace chunk is already waiting for a trace chunk close command");
2508 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2509 ret = -1;
2510 goto end_unlock_session;
2511 }
2512 conn->session->pending_closure_trace_chunk =
2513 conn->session->current_trace_chunk;
e5add6d0 2514 conn->session->current_trace_chunk = published_chunk;
e5add6d0 2515 published_chunk = NULL;
62bad3bf 2516end_unlock_session:
c35f9726 2517 pthread_mutex_unlock(&conn->session->lock);
e5add6d0
JG		 2518end:
2519 reply.ret_code = htobe32((uint32_t) reply_code);
2520 send_ret = conn->sock->ops->sendmsg(conn->sock,
2521 &reply,
2522 sizeof(struct lttcomm_relayd_generic_reply),
2523 0);
2524 if (send_ret < (ssize_t) sizeof(reply)) {
2525 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
2526 send_ret);
2527 ret = -1;
2528 }
2529end_no_reply:
2530 lttng_trace_chunk_put(chunk);
2531 lttng_trace_chunk_put(published_chunk);
e5add6d0
JG		 2532 return ret;
2533}
2534
bbc4768c
JG		 2535/*
2536 * relay_close_trace_chunk: close a trace chunk
2537 */
2538static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
2539 struct relay_connection *conn,
2540 const struct lttng_buffer_view *payload)
2541{
9898f786 2542 int ret = 0, buf_ret;
bbc4768c
JG		 2543 ssize_t send_ret;
2544 struct relay_session *session = conn->session;
2545 struct lttcomm_relayd_close_trace_chunk *msg;
ecd1a12f 2546 struct lttcomm_relayd_close_trace_chunk_reply reply = {};
bbc4768c
JG		 2547 struct lttng_buffer_view header_view;
2548 struct lttng_trace_chunk *chunk = NULL;
2549 enum lttng_error_code reply_code = LTTNG_OK;
2550 enum lttng_trace_chunk_status chunk_status;
2551 uint64_t chunk_id;
c35f9726 2552 LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command = {};
bbc4768c 2553 time_t close_timestamp;
ecd1a12f
MD		 2554 char closed_trace_chunk_path[LTTNG_PATH_MAX];
2555 size_t path_length = 0;
2556 const char *chunk_name = NULL;
2557 struct lttng_dynamic_buffer reply_payload;
2558
2559 lttng_dynamic_buffer_init(&reply_payload);
bbc4768c
JG		 2560
2561 if (!session || !conn->version_check_done) {
2562 ERR("Trying to close a trace chunk before version check");
2563 ret = -1;
2564 goto end_no_reply;
2565 }
2566
2567 if (session->major == 2 && session->minor < 11) {
2568 ERR("Chunk close command is unsupported before 2.11");
2569 ret = -1;
2570 goto end_no_reply;
2571 }
2572
2573 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2574 if (!header_view.data) {
2575 ERR("Failed to receive payload of chunk close command");
2576 ret = -1;
2577 goto end_no_reply;
2578 }
2579
2580 /* Convert to host endianness. */
2581 msg = (typeof(msg)) header_view.data;
2582 chunk_id = be64toh(msg->chunk_id);
2583 close_timestamp = (time_t) be64toh(msg->close_timestamp);
2584 close_command = (typeof(close_command)){
2585 .value = be32toh(msg->close_command.value),
2586 .is_set = msg->close_command.is_set,
2587 };
2588
2589 chunk = sessiond_trace_chunk_registry_get_chunk(
2590 sessiond_trace_chunk_registry,
2591 conn->session->sessiond_uuid,
2592 conn->session->id,
2593 chunk_id);
2594 if (!chunk) {
2595 char uuid_str[UUID_STR_LEN];
2596
2597 lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
2598 ERR("Failed to find chunk to close: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
2599 uuid_str,
2600 conn->session->id,
2601 msg->chunk_id);
2602 ret = -1;
2603 reply_code = LTTNG_ERR_NOMEM;
2604 goto end;
2605 }
2606
62bad3bf
JG		 2607 pthread_mutex_lock(&session->lock);
2608 if (session->pending_closure_trace_chunk &&
2609 session->pending_closure_trace_chunk != chunk) {
2610 ERR("Trace chunk close command for session \"%s\" does not target the trace chunk pending closure",
2611 session->session_name);
2612 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2613 ret = -1;
2614 goto end_unlock_session;
2615 }
2616
bbc4768c
JG		 2617 chunk_status = lttng_trace_chunk_set_close_timestamp(
2618 chunk, close_timestamp);
2619 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2620 ERR("Failed to set trace chunk close timestamp");
2621 ret = -1;
2622 reply_code = LTTNG_ERR_UNK;
62bad3bf 2623 goto end_unlock_session;
bbc4768c
JG		 2624 }
2625
2626 if (close_command.is_set) {
2627 chunk_status = lttng_trace_chunk_set_close_command(
2628 chunk, close_command.value);
2629 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2630 ret = -1;
2631 reply_code = LTTNG_ERR_INVALID;
62bad3bf 2632 goto end_unlock_session;
bbc4768c
JG		 2633 }
2634 }
ecd1a12f
MD		 2635 chunk_status = lttng_trace_chunk_get_name(chunk, &chunk_name, NULL);
2636 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2637 ERR("Failed to get chunk name");
2638 ret = -1;
2639 reply_code = LTTNG_ERR_UNK;
2640 goto end_unlock_session;
2641 }
2642 if (!session->has_rotated && !session->snapshot) {
2643 ret = lttng_strncpy(closed_trace_chunk_path,
2644 session->output_path,
2645 sizeof(closed_trace_chunk_path));
2646 if (ret) {
2647 ERR("Failed to send trace chunk path: path length of %zu bytes exceeds the maximal allowed length of %zu bytes",
2648 strlen(session->output_path),
2649 sizeof(closed_trace_chunk_path));
2650 reply_code = LTTNG_ERR_NOMEM;
2651 ret = -1;
2652 goto end_unlock_session;
2653 }
2654 } else {
2655 if (session->snapshot) {
2656 ret = snprintf(closed_trace_chunk_path,
2657 sizeof(closed_trace_chunk_path),
2658 "%s/%s", session->output_path,
2659 chunk_name);
2660 } else {
2661 ret = snprintf(closed_trace_chunk_path,
2662 sizeof(closed_trace_chunk_path),
2663 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
2664 "/%s",
2665 session->output_path, chunk_name);
2666 }
2667 if (ret < 0 || ret == sizeof(closed_trace_chunk_path)) {
2668 ERR("Failed to format closed trace chunk resulting path");
2669 reply_code = ret < 0 ? LTTNG_ERR_UNK : LTTNG_ERR_NOMEM;
2670 ret = -1;
2671 goto end_unlock_session;
2672 }
2673 }
2674 DBG("Reply chunk path on close: %s", closed_trace_chunk_path);
2675 path_length = strlen(closed_trace_chunk_path) + 1;
2676 if (path_length > UINT32_MAX) {
2677 ERR("Closed trace chunk path exceeds the maximal length allowed by the protocol");
2678 ret = -1;
2679 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2680 goto end_unlock_session;
2681 }
bbc4768c 2682
c35f9726
JG		 2683 if (session->current_trace_chunk == chunk) {
2684 /*
2685 * After a trace chunk close command, no new streams
2686 * referencing the chunk may be created. Hence, on the
2687 * event that no new trace chunk have been created for
2688 * the session, the reference to the current trace chunk
2689 * is released in order to allow it to be reclaimed when
2690 * the last stream releases its reference to it.
2691 */
2692 lttng_trace_chunk_put(session->current_trace_chunk);
2693 session->current_trace_chunk = NULL;
2694 }
62bad3bf
JG		 2695 lttng_trace_chunk_put(session->pending_closure_trace_chunk);
2696 session->pending_closure_trace_chunk = NULL;
2697end_unlock_session:
c35f9726
JG		 2698 pthread_mutex_unlock(&session->lock);
2699
bbc4768c 2700end:
ecd1a12f
MD		 2701 reply.generic.ret_code = htobe32((uint32_t) reply_code);
2702 reply.path_length = htobe32((uint32_t) path_length);
9898f786 2703 buf_ret = lttng_dynamic_buffer_append(
ecd1a12f 2704 &reply_payload, &reply, sizeof(reply));
9898f786 2705 if (buf_ret) {
ecd1a12f
MD		 2706 ERR("Failed to append \"close trace chunk\" command reply header to payload buffer");
2707 goto end_no_reply;
2708 }
2709
2710 if (reply_code == LTTNG_OK) {
9898f786 2711 buf_ret = lttng_dynamic_buffer_append(&reply_payload,
ecd1a12f 2712 closed_trace_chunk_path, path_length);
9898f786 2713 if (buf_ret) {
ecd1a12f
MD		 2714 ERR("Failed to append \"close trace chunk\" command reply path to payload buffer");
2715 goto end_no_reply;
2716 }
2717 }
2718
bbc4768c 2719 send_ret = conn->sock->ops->sendmsg(conn->sock,
ecd1a12f
MD		 2720 reply_payload.data,
2721 reply_payload.size,
bbc4768c 2722 0);
ecd1a12f
MD		 2723 if (send_ret < reply_payload.size) {
2724 ERR("Failed to send \"close trace chunk\" command reply of %zu bytes (ret = %zd)",
2725 reply_payload.size, send_ret);
bbc4768c 2726 ret = -1;
ecd1a12f 2727 goto end_no_reply;
bbc4768c
JG		 2728 }
2729end_no_reply:
2730 lttng_trace_chunk_put(chunk);
ecd1a12f 2731 lttng_dynamic_buffer_reset(&reply_payload);
bbc4768c
JG		 2732 return ret;
2733}
2734
c35f9726
JG		 2735/*
2736 * relay_trace_chunk_exists: check if a trace chunk exists
2737 */
2738static int relay_trace_chunk_exists(const struct lttcomm_relayd_hdr *recv_hdr,
2739 struct relay_connection *conn,
2740 const struct lttng_buffer_view *payload)
2741{
2742 int ret = 0;
2743 ssize_t send_ret;
2744 struct relay_session *session = conn->session;
2745 struct lttcomm_relayd_trace_chunk_exists *msg;
2746 struct lttcomm_relayd_trace_chunk_exists_reply reply = {};
2747 struct lttng_buffer_view header_view;
c35f9726 2748 uint64_t chunk_id;
6b584c2e 2749 bool chunk_exists;
c35f9726
JG		 2750
2751 if (!session || !conn->version_check_done) {
2752 ERR("Trying to close a trace chunk before version check");
2753 ret = -1;
2754 goto end_no_reply;
2755 }
2756
2757 if (session->major == 2 && session->minor < 11) {
2758 ERR("Chunk close command is unsupported before 2.11");
2759 ret = -1;
2760 goto end_no_reply;
2761 }
2762
2763 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2764 if (!header_view.data) {
2765 ERR("Failed to receive payload of chunk close command");
2766 ret = -1;
2767 goto end_no_reply;
2768 }
2769
2770 /* Convert to host endianness. */
2771 msg = (typeof(msg)) header_view.data;
2772 chunk_id = be64toh(msg->chunk_id);
2773
6b584c2e 2774 ret = sessiond_trace_chunk_registry_chunk_exists(
c35f9726
JG		 2775 sessiond_trace_chunk_registry,
2776 conn->session->sessiond_uuid,
2777 conn->session->id,
6b584c2e
JG		 2778 chunk_id, &chunk_exists);
2779 /*
2780 * If ret is not 0, send the reply and report the error to the caller.
2781 * It is a protocol (or internal) error and the session/connection
2782 * should be torn down.
2783 */
2784 reply = (typeof(reply)){
2785 .generic.ret_code = htobe32((uint32_t)
2786 (ret == 0 ? LTTNG_OK : LTTNG_ERR_INVALID_PROTOCOL)),
2787 .trace_chunk_exists = ret == 0 ? chunk_exists : 0,
c35f9726 2788 };
6b584c2e
JG		 2789 send_ret = conn->sock->ops->sendmsg(
2790 conn->sock, &reply, sizeof(reply), 0);
c35f9726
JG		 2791 if (send_ret < (ssize_t) sizeof(reply)) {
2792 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
2793 send_ret);
2794 ret = -1;
2795 }
2796end_no_reply:
c35f9726
JG		 2797 return ret;
2798}
2799
5312a3ed
JG		 2800#define DBG_CMD(cmd_name, conn) \
2801 DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
2802
2803static int relay_process_control_command(struct relay_connection *conn,
2804 const struct lttcomm_relayd_hdr *header,
2805 const struct lttng_buffer_view *payload)
b8aa1682
JD		 2806{
2807 int ret = 0;
2808
5312a3ed 2809 switch (header->cmd) {
b8aa1682 2810 case RELAYD_CREATE_SESSION:
5312a3ed
JG		 2811 DBG_CMD("RELAYD_CREATE_SESSION", conn);
2812 ret = relay_create_session(header, conn, payload);
b8aa1682 2813 break;
b8aa1682 2814 case RELAYD_ADD_STREAM:
5312a3ed
JG		 2815 DBG_CMD("RELAYD_ADD_STREAM", conn);
2816 ret = relay_add_stream(header, conn, payload);
b8aa1682
JD		 2817 break;
2818 case RELAYD_START_DATA:
5312a3ed
JG		 2819 DBG_CMD("RELAYD_START_DATA", conn);
2820 ret = relay_start(header, conn, payload);
b8aa1682
JD		 2821 break;
2822 case RELAYD_SEND_METADATA:
5312a3ed
JG		 2823 DBG_CMD("RELAYD_SEND_METADATA", conn);
2824 ret = relay_recv_metadata(header, conn, payload);
b8aa1682
JD		 2825 break;
2826 case RELAYD_VERSION:
5312a3ed
JG		 2827 DBG_CMD("RELAYD_VERSION", conn);
2828 ret = relay_send_version(header, conn, payload);
b8aa1682 2829 break;
173af62f 2830 case RELAYD_CLOSE_STREAM:
5312a3ed
JG		 2831 DBG_CMD("RELAYD_CLOSE_STREAM", conn);
2832 ret = relay_close_stream(header, conn, payload);
173af62f 2833 break;
6d805429 2834 case RELAYD_DATA_PENDING:
5312a3ed
JG		 2835 DBG_CMD("RELAYD_DATA_PENDING", conn);
2836 ret = relay_data_pending(header, conn, payload);
c8f59ee5
DG		 2837 break;
2838 case RELAYD_QUIESCENT_CONTROL:
5312a3ed
JG		 2839 DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
2840 ret = relay_quiescent_control(header, conn, payload);
c8f59ee5 2841 break;
f7079f67 2842 case RELAYD_BEGIN_DATA_PENDING:
5312a3ed
JG		 2843 DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
2844 ret = relay_begin_data_pending(header, conn, payload);
f7079f67
DG		 2845 break;
2846 case RELAYD_END_DATA_PENDING:
5312a3ed
JG		 2847 DBG_CMD("RELAYD_END_DATA_PENDING", conn);
2848 ret = relay_end_data_pending(header, conn, payload);
f7079f67 2849 break;
1c20f0e2 2850 case RELAYD_SEND_INDEX:
5312a3ed
JG		 2851 DBG_CMD("RELAYD_SEND_INDEX", conn);
2852 ret = relay_recv_index(header, conn, payload);
1c20f0e2 2853 break;
a4baae1b 2854 case RELAYD_STREAMS_SENT:
5312a3ed
JG		 2855 DBG_CMD("RELAYD_STREAMS_SENT", conn);
2856 ret = relay_streams_sent(header, conn, payload);
a4baae1b 2857 break;
93ec662e 2858 case RELAYD_RESET_METADATA:
5312a3ed
JG		 2859 DBG_CMD("RELAYD_RESET_METADATA", conn);
2860 ret = relay_reset_metadata(header, conn, payload);
93ec662e 2861 break;
c35f9726
JG		 2862 case RELAYD_ROTATE_STREAMS:
2863 DBG_CMD("RELAYD_ROTATE_STREAMS", conn);
2864 ret = relay_rotate_session_streams(header, conn, payload);
d3ecc550 2865 break;
e5add6d0
JG		 2866 case RELAYD_CREATE_TRACE_CHUNK:
2867 DBG_CMD("RELAYD_CREATE_TRACE_CHUNK", conn);
2868 ret = relay_create_trace_chunk(header, conn, payload);
2869 break;
bbc4768c
JG		 2870 case RELAYD_CLOSE_TRACE_CHUNK:
2871 DBG_CMD("RELAYD_CLOSE_TRACE_CHUNK", conn);
2872 ret = relay_close_trace_chunk(header, conn, payload);
2873 break;
c35f9726
JG		 2874 case RELAYD_TRACE_CHUNK_EXISTS:
2875 DBG_CMD("RELAYD_TRACE_CHUNK_EXISTS", conn);
2876 ret = relay_trace_chunk_exists(header, conn, payload);
2877 break;
b8aa1682
JD		 2878 case RELAYD_UPDATE_SYNC_INFO:
2879 default:
5312a3ed 2880 ERR("Received unknown command (%u)", header->cmd);
58eb9381 2881 relay_unknown_command(conn);
b8aa1682
JD		 2882 ret = -1;
2883 goto end;
2884 }
2885
2886end:
2887 return ret;
2888}
2889
5569b118
JG		 2890static enum relay_connection_status relay_process_control_receive_payload(
2891 struct relay_connection *conn)
5312a3ed
JG		 2892{
2893 int ret = 0;
5569b118 2894 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 2895 struct lttng_dynamic_buffer *reception_buffer =
2896 &conn->protocol.ctrl.reception_buffer;
2897 struct ctrl_connection_state_receive_payload *state =
2898 &conn->protocol.ctrl.state.receive_payload;
2899 struct lttng_buffer_view payload_view;
2900
2901 if (state->left_to_receive == 0) {
2902 /* Short-circuit for payload-less commands. */
2903 goto reception_complete;
2904 }
2905
2906 ret = conn->sock->ops->recvmsg(conn->sock,
2907 reception_buffer->data + state->received,
2908 state->left_to_receive, MSG_DONTWAIT);
2909 if (ret < 0) {
5569b118
JG		 2910 if (errno != EAGAIN && errno != EWOULDBLOCK) {
2911 PERROR("Unable to receive command payload on sock %d",
2912 conn->sock->fd);
2913 status = RELAY_CONNECTION_STATUS_ERROR;
2914 }
5312a3ed
JG		 2915 goto end;
2916 } else if (ret == 0) {
2917 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 2918 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG		 2919 goto end;
2920 }
2921
2922 assert(ret > 0);
2923 assert(ret <= state->left_to_receive);
2924
2925 state->left_to_receive -= ret;
2926 state->received += ret;
2927
2928 if (state->left_to_receive > 0) {
2929 /*
2930 * Can't transition to the protocol's next state, wait to
2931 * receive the rest of the header.
2932 */
2933 DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
2934 state->received, state->left_to_receive,
2935 conn->sock->fd);
5312a3ed
JG		 2936 goto end;
2937 }
2938
2939reception_complete:
2940 DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
2941 conn->sock->fd, state->received);
2942 /*
2943 * The payload required to process the command has been received.
2944 * A view to the reception buffer is forwarded to the various
2945 * commands and the state of the control is reset on success.
2946 *
2947 * Commands are responsible for sending their reply to the peer.
2948 */
2949 payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
2950 0, -1);
2951 ret = relay_process_control_command(conn,
2952 &state->header, &payload_view);
2953 if (ret < 0) {
5569b118 2954 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 2955 goto end;
2956 }
2957
2958 ret = connection_reset_protocol_state(conn);
5569b118
JG		 2959 if (ret) {
2960 status = RELAY_CONNECTION_STATUS_ERROR;
2961 }
5312a3ed 2962end:
5569b118 2963 return status;
5312a3ed
JG		 2964}
2965
5569b118
JG		 2966static enum relay_connection_status relay_process_control_receive_header(
2967 struct relay_connection *conn)
5312a3ed
JG		 2968{
2969 int ret = 0;
5569b118 2970 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 2971 struct lttcomm_relayd_hdr header;
2972 struct lttng_dynamic_buffer *reception_buffer =
2973 &conn->protocol.ctrl.reception_buffer;
2974 struct ctrl_connection_state_receive_header *state =
2975 &conn->protocol.ctrl.state.receive_header;
2976
2977 assert(state->left_to_receive != 0);
2978
2979 ret = conn->sock->ops->recvmsg(conn->sock,
2980 reception_buffer->data + state->received,
2981 state->left_to_receive, MSG_DONTWAIT);
2982 if (ret < 0) {
5569b118
JG		 2983 if (errno != EAGAIN && errno != EWOULDBLOCK) {
2984 PERROR("Unable to receive control command header on sock %d",
2985 conn->sock->fd);
2986 status = RELAY_CONNECTION_STATUS_ERROR;
2987 }
5312a3ed
JG		 2988 goto end;
2989 } else if (ret == 0) {
2990 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 2991 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG		 2992 goto end;
2993 }
2994
2995 assert(ret > 0);
2996 assert(ret <= state->left_to_receive);
2997
2998 state->left_to_receive -= ret;
2999 state->received += ret;
3000
3001 if (state->left_to_receive > 0) {
3002 /*
3003 * Can't transition to the protocol's next state, wait to
3004 * receive the rest of the header.
3005 */
3006 DBG3("Partial reception of control connection protocol header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3007 state->received, state->left_to_receive,
3008 conn->sock->fd);
5312a3ed
JG		 3009 goto end;
3010 }
3011
3012 /* Transition to next state: receiving the command's payload. */
3013 conn->protocol.ctrl.state_id =
3014 CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD;
3015 memcpy(&header, reception_buffer->data, sizeof(header));
3016 header.circuit_id = be64toh(header.circuit_id);
3017 header.data_size = be64toh(header.data_size);
3018 header.cmd = be32toh(header.cmd);
3019 header.cmd_version = be32toh(header.cmd_version);
3020 memcpy(&conn->protocol.ctrl.state.receive_payload.header,
3021 &header, sizeof(header));
3022
3023 DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32 ", cmd_version = %" PRIu32 ", payload size = %" PRIu64 " bytes",
3024 conn->sock->fd, header.cmd, header.cmd_version,
3025 header.data_size);
3026
715e6fb1 3027 if (header.data_size > DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE) {
5312a3ed
JG		 3028 ERR("Command header indicates a payload (%" PRIu64 " bytes) that exceeds the maximal payload size allowed on a control connection.",
3029 header.data_size);
5569b118 3030 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3031 goto end;
3032 }
3033
3034 conn->protocol.ctrl.state.receive_payload.left_to_receive =
3035 header.data_size;
3036 conn->protocol.ctrl.state.receive_payload.received = 0;
3037 ret = lttng_dynamic_buffer_set_size(reception_buffer,
3038 header.data_size);
3039 if (ret) {
5569b118 3040 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3041 goto end;
3042 }
3043
3044 if (header.data_size == 0) {
3045 /*
3046 * Manually invoke the next state as the poll loop
3047 * will not wake-up to allow us to proceed further.
3048 */
5569b118 3049 status = relay_process_control_receive_payload(conn);
5312a3ed
JG		 3050 }
3051end:
5569b118 3052 return status;
5312a3ed
JG		 3053}
3054
3055/*
3056 * Process the commands received on the control socket
3057 */
5569b118
JG		 3058static enum relay_connection_status relay_process_control(
3059 struct relay_connection *conn)
5312a3ed 3060{
5569b118 3061 enum relay_connection_status status;
5312a3ed
JG		 3062
3063 switch (conn->protocol.ctrl.state_id) {
3064 case CTRL_CONNECTION_STATE_RECEIVE_HEADER:
5569b118 3065 status = relay_process_control_receive_header(conn);
5312a3ed
JG		 3066 break;
3067 case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD:
5569b118 3068 status = relay_process_control_receive_payload(conn);
5312a3ed
JG		 3069 break;
3070 default:
3071 ERR("Unknown control connection protocol state encountered.");
3072 abort();
3073 }
3074
5569b118 3075 return status;
5312a3ed
JG		 3076}
3077
5569b118
JG		 3078static enum relay_connection_status relay_process_data_receive_header(
3079 struct relay_connection *conn)
b8aa1682 3080{
5312a3ed 3081 int ret;
5569b118 3082 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 3083 struct data_connection_state_receive_header *state =
3084 &conn->protocol.data.state.receive_header;
3085 struct lttcomm_relayd_data_hdr header;
b8aa1682 3086 struct relay_stream *stream;
5312a3ed
JG		 3087
3088 assert(state->left_to_receive != 0);
3089
3090 ret = conn->sock->ops->recvmsg(conn->sock,
3091 state->header_reception_buffer + state->received,
3092 state->left_to_receive, MSG_DONTWAIT);
3093 if (ret < 0) {
5569b118
JG		 3094 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3095 PERROR("Unable to receive data header on sock %d", conn->sock->fd);
3096 status = RELAY_CONNECTION_STATUS_ERROR;
3097 }
5312a3ed
JG		 3098 goto end;
3099 } else if (ret == 0) {
3100 /* Orderly shutdown. Not necessary to print an error. */
3101 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3102 status = RELAY_CONNECTION_STATUS_CLOSED;
b8aa1682
JD		 3103 goto end;
3104 }
3105
5312a3ed
JG		 3106 assert(ret > 0);
3107 assert(ret <= state->left_to_receive);
3108
3109 state->left_to_receive -= ret;
3110 state->received += ret;
3111
3112 if (state->left_to_receive > 0) {
3113 /*
3114 * Can't transition to the protocol's next state, wait to
3115 * receive the rest of the header.
3116 */
3117 DBG3("Partial reception of data connection header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3118 state->received, state->left_to_receive,
3119 conn->sock->fd);
7591bab1 3120 goto end;
b8aa1682 3121 }
b8aa1682 3122
5312a3ed
JG		 3123 /* Transition to next state: receiving the payload. */
3124 conn->protocol.data.state_id = DATA_CONNECTION_STATE_RECEIVE_PAYLOAD;
173af62f 3125
5312a3ed
JG		 3126 memcpy(&header, state->header_reception_buffer, sizeof(header));
3127 header.circuit_id = be64toh(header.circuit_id);
3128 header.stream_id = be64toh(header.stream_id);
3129 header.data_size = be32toh(header.data_size);
3130 header.net_seq_num = be64toh(header.net_seq_num);
3131 header.padding_size = be32toh(header.padding_size);
3132 memcpy(&conn->protocol.data.state.receive_payload.header, &header, sizeof(header));
3133
3134 conn->protocol.data.state.receive_payload.left_to_receive =
3135 header.data_size;
3136 conn->protocol.data.state.receive_payload.received = 0;
3137 conn->protocol.data.state.receive_payload.rotate_index = false;
3138
3139 DBG("Received data connection header on fd %i: circuit_id = %" PRIu64 ", stream_id = %" PRIu64 ", data_size = %" PRIu32 ", net_seq_num = %" PRIu64 ", padding_size = %" PRIu32,
3140 conn->sock->fd, header.circuit_id,
3141 header.stream_id, header.data_size,
3142 header.net_seq_num, header.padding_size);
3143
3144 stream = stream_get_by_id(header.stream_id);
3145 if (!stream) {
3146 DBG("relay_process_data_receive_payload: Cannot find stream %" PRIu64,
3147 header.stream_id);
5569b118
JG		 3148 /* Protocol error. */
3149 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3150 goto end;
3151 }
b8aa1682 3152
7591bab1 3153 pthread_mutex_lock(&stream->lock);
c35f9726
JG		 3154 /* Prepare stream for the reception of a new packet. */
3155 ret = stream_init_packet(stream, header.data_size,
3156 &conn->protocol.data.state.receive_payload.rotate_index);
3157 pthread_mutex_unlock(&stream->lock);
3158 if (ret) {
3159 ERR("Failed to rotate stream output file");
3160 status = RELAY_CONNECTION_STATUS_ERROR;
3161 goto end_stream_unlock;
1c20f0e2
JD		 3162 }
3163
5312a3ed 3164end_stream_unlock:
5312a3ed
JG		 3165 stream_put(stream);
3166end:
5569b118 3167 return status;
5312a3ed
JG		 3168}
3169
5569b118
JG		 3170static enum relay_connection_status relay_process_data_receive_payload(
3171 struct relay_connection *conn)
5312a3ed
JG		 3172{
3173 int ret;
5569b118 3174 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG		 3175 struct relay_stream *stream;
3176 struct data_connection_state_receive_payload *state =
3177 &conn->protocol.data.state.receive_payload;
3178 const size_t chunk_size = RECV_DATA_BUFFER_SIZE;
3179 char data_buffer[chunk_size];
3180 bool partial_recv = false;
3181 bool new_stream = false, close_requested = false, index_flushed = false;
3182 uint64_t left_to_receive = state->left_to_receive;
3183 struct relay_session *session;
3184
fd0f1e3e
JR		 3185 DBG3("Receiving data for stream id %" PRIu64 " seqnum %" PRIu64 ", %" PRIu64" bytes received, %" PRIu64 " bytes left to receive",
3186 state->header.stream_id, state->header.net_seq_num,
3187 state->received, left_to_receive);
3188
5312a3ed
JG		 3189 stream = stream_get_by_id(state->header.stream_id);
3190 if (!stream) {
5569b118 3191 /* Protocol error. */
fd0f1e3e 3192 ERR("relay_process_data_receive_payload: cannot find stream %" PRIu64,
5312a3ed 3193 state->header.stream_id);
5569b118 3194 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed 3195 goto end;
1c20f0e2
JD		 3196 }
3197
5312a3ed
JG		 3198 pthread_mutex_lock(&stream->lock);
3199 session = stream->trace->session;
fd0f1e3e
JR		 3200 if (!conn->session) {
3201 ret = connection_set_session(conn, session);
3202 if (ret) {
3203 status = RELAY_CONNECTION_STATUS_ERROR;
3204 goto end_stream_unlock;
3205 }
3206 }
5312a3ed
JG		 3207
3208 /*
3209 * The size of the "chunk" received on any iteration is bounded by:
3210 * - the data left to receive,
3211 * - the data immediately available on the socket,
3212 * - the on-stack data buffer
3213 */
3214 while (left_to_receive > 0 && !partial_recv) {
5312a3ed 3215 size_t recv_size = min(left_to_receive, chunk_size);
c35f9726 3216 struct lttng_buffer_view packet_chunk;
5312a3ed
JG		 3217
3218 ret = conn->sock->ops->recvmsg(conn->sock, data_buffer,
3219 recv_size, MSG_DONTWAIT);
3220 if (ret < 0) {
5569b118
JG		 3221 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3222 PERROR("Socket %d error", conn->sock->fd);
3223 status = RELAY_CONNECTION_STATUS_ERROR;
3224 }
0848dba7 3225 goto end_stream_unlock;
5312a3ed
JG		 3226 } else if (ret == 0) {
3227 /* No more data ready to be consumed on socket. */
3228 DBG3("No more data ready for consumption on data socket of stream id %" PRIu64,
3229 state->header.stream_id);
5569b118 3230 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG		 3231 break;
3232 } else if (ret < (int) recv_size) {
3233 /*
3234 * All the data available on the socket has been
3235 * consumed.
3236 */
3237 partial_recv = true;
c35f9726 3238 recv_size = ret;
0848dba7
MD		 3239 }
3240
c35f9726
JG		 3241 packet_chunk = lttng_buffer_view_init(data_buffer,
3242 0, recv_size);
3243 assert(packet_chunk.data);
5312a3ed 3244
c35f9726
JG		 3245 ret = stream_write(stream, &packet_chunk, 0);
3246 if (ret) {
0848dba7 3247 ERR("Relay error writing data to file");
5569b118 3248 status = RELAY_CONNECTION_STATUS_ERROR;
0848dba7
MD		 3249 goto end_stream_unlock;
3250 }
3251
5312a3ed
JG		 3252 left_to_receive -= recv_size;
3253 state->received += recv_size;
3254 state->left_to_receive = left_to_receive;
5312a3ed
JG		 3255 }
3256
3257 if (state->left_to_receive > 0) {
3258 /*
3259 * Did not receive all the data expected, wait for more data to
3260 * become available on the socket.
3261 */
3262 DBG3("Partial receive on data connection of stream id %" PRIu64 ", %" PRIu64 " bytes received, %" PRIu64 " bytes left to receive",
3263 state->header.stream_id, state->received,
3264 state->left_to_receive);
5312a3ed 3265 goto end_stream_unlock;
0848dba7 3266 }
5ab7344e 3267
c35f9726
JG		 3268 ret = stream_write(stream, NULL, state->header.padding_size);
3269 if (ret) {
5569b118 3270 status = RELAY_CONNECTION_STATUS_ERROR;
7591bab1 3271 goto end_stream_unlock;
1d4dfdef 3272 }
5312a3ed 3273
298a25ca 3274 if (session_streams_have_index(session)) {
c35f9726
JG		 3275 ret = stream_update_index(stream, state->header.net_seq_num,
3276 state->rotate_index, &index_flushed,
3277 state->header.data_size + state->header.padding_size);
5312a3ed 3278 if (ret < 0) {
c35f9726 3279 ERR("Failed to update index: stream %" PRIu64 " net_seq_num %" PRIu64 " ret %d",
5312a3ed
JG		 3280 stream->stream_handle,
3281 state->header.net_seq_num, ret);
5569b118 3282 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG		 3283 goto end_stream_unlock;
3284 }
3285 }
3286
a8f9f353 3287 if (stream->prev_data_seq == -1ULL) {
c0bae11d
MD		 3288 new_stream = true;
3289 }
3290
c35f9726
JG		 3291 ret = stream_complete_packet(stream, state->header.data_size +
3292 state->header.padding_size, state->header.net_seq_num,
3293 index_flushed);
3294 if (ret) {
3295 status = RELAY_CONNECTION_STATUS_ERROR;
3296 goto end_stream_unlock;
3297 }
5312a3ed
JG		 3298
3299 /*
3300 * Resetting the protocol state (to RECEIVE_HEADER) will trash the
3301 * contents of *state which are aliased (union) to the same location as
3302 * the new state. Don't use it beyond this point.
3303 */
3304 connection_reset_protocol_state(conn);
3305 state = NULL;
173af62f 3306
7591bab1 3307end_stream_unlock:
bda7c7b9 3308 close_requested = stream->close_requested;
7591bab1 3309 pthread_mutex_unlock(&stream->lock);
5312a3ed 3310 if (close_requested && left_to_receive == 0) {
bda7c7b9
JG		 3311 try_stream_close(stream);
3312 }
3313
c0bae11d
MD		 3314 if (new_stream) {
3315 pthread_mutex_lock(&session->lock);
3316 uatomic_set(&session->new_streams, 1);
3317 pthread_mutex_unlock(&session->lock);
3318 }
5312a3ed 3319
7591bab1 3320 stream_put(stream);
b8aa1682 3321end:
5569b118 3322 return status;
b8aa1682
JD		 3323}
3324
5312a3ed
JG		 3325/*
3326 * relay_process_data: Process the data received on the data socket
3327 */
5569b118
JG		 3328static enum relay_connection_status relay_process_data(
3329 struct relay_connection *conn)
5312a3ed 3330{
5569b118 3331 enum relay_connection_status status;
5312a3ed
JG		 3332
3333 switch (conn->protocol.data.state_id) {
3334 case DATA_CONNECTION_STATE_RECEIVE_HEADER:
5569b118 3335 status = relay_process_data_receive_header(conn);
5312a3ed
JG		 3336 break;
3337 case DATA_CONNECTION_STATE_RECEIVE_PAYLOAD:
5569b118 3338 status = relay_process_data_receive_payload(conn);
5312a3ed
JG		 3339 break;
3340 default:
3341 ERR("Unexpected data connection communication state.");
3342 abort();
3343 }
3344
5569b118 3345 return status;
5312a3ed
JG		 3346}
3347
7591bab1 3348static void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
b8aa1682
JD		 3349{
3350 int ret;
3351
58eb9381 3352 (void) lttng_poll_del(events, pollfd);
b8aa1682
JD		 3353
3354 ret = close(pollfd);
3355 if (ret < 0) {
3356 ERR("Closing pollfd %d", pollfd);
3357 }
3358}
3359
7591bab1
MD		 3360static void relay_thread_close_connection(struct lttng_poll_event *events,
3361 int pollfd, struct relay_connection *conn)
9d1bbf21 3362{
7591bab1 3363 const char *type_str;
2a174661 3364
7591bab1
MD		 3365 switch (conn->type) {
3366 case RELAY_DATA:
3367 type_str = "Data";
3368 break;
3369 case RELAY_CONTROL:
3370 type_str = "Control";
3371 break;
3372 case RELAY_VIEWER_COMMAND:
3373 type_str = "Viewer Command";
3374 break;
3375 case RELAY_VIEWER_NOTIFICATION:
3376 type_str = "Viewer Notification";
3377 break;
3378 default:
3379 type_str = "Unknown";
9d1bbf21 3380 }
7591bab1
MD		 3381 cleanup_connection_pollfd(events, pollfd);
3382 connection_put(conn);
3383 DBG("%s connection closed with %d", type_str, pollfd);
b8aa1682
JD		 3384}
3385
3386/*
3387 * This thread does the actual work
3388 */
7591bab1 3389static void *relay_thread_worker(void *data)
b8aa1682 3390{
beaad64c
DG		 3391 int ret, err = -1, last_seen_data_fd = -1;
3392 uint32_t nb_fd;
b8aa1682
JD		 3393 struct lttng_poll_event events;
3394 struct lttng_ht *relay_connections_ht;
b8aa1682 3395 struct lttng_ht_iter iter;
90e7d72f 3396 struct relay_connection *destroy_conn = NULL;
b8aa1682
JD		 3397
3398 DBG("[thread] Relay worker started");
3399
9d1bbf21
MD		 3400 rcu_register_thread();
3401
55706a7d
MD		 3402 health_register(health_relayd, HEALTH_RELAYD_TYPE_WORKER);
3403
9b5e0863
MD		 3404 if (testpoint(relayd_thread_worker)) {
3405 goto error_testpoint;
3406 }
3407
f385ae0a
MD		 3408 health_code_update();
3409
b8aa1682
JD		 3410 /* table of connections indexed on socket */
3411 relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
095a4ae5
MD		 3412 if (!relay_connections_ht) {
3413 goto relay_connections_ht_error;
3414 }
b8aa1682 3415
b8aa1682
JD		 3416 ret = create_thread_poll_set(&events, 2);
3417 if (ret < 0) {
3418 goto error_poll_create;
3419 }
3420
58eb9381 3421 ret = lttng_poll_add(&events, relay_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
b8aa1682
JD		 3422 if (ret < 0) {
3423 goto error;
3424 }
3425
beaad64c 3426restart:
b8aa1682 3427 while (1) {
beaad64c
DG		 3428 int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1;
3429
f385ae0a
MD		 3430 health_code_update();
3431
b8aa1682 3432 /* Infinite blocking call, waiting for transmission */
87c1611d 3433 DBG3("Relayd worker thread polling...");
f385ae0a 3434 health_poll_entry();
b8aa1682 3435 ret = lttng_poll_wait(&events, -1);
f385ae0a 3436 health_poll_exit();
b8aa1682
JD		 3437 if (ret < 0) {
3438 /*
3439 * Restart interrupted system call.
3440 */
3441 if (errno == EINTR) {
3442 goto restart;
3443 }
3444 goto error;
3445 }
3446
0d9c5d77
DG		 3447 nb_fd = ret;
3448
beaad64c 3449 /*
7591bab1
MD		 3450 * Process control. The control connection is
3451 * prioritized so we don't starve it with high
3452 * throughput tracing data on the data connection.
beaad64c 3453 */
b8aa1682
JD		 3454 for (i = 0; i < nb_fd; i++) {
3455 /* Fetch once the poll data */
beaad64c
DG		 3456 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
3457 int pollfd = LTTNG_POLL_GETFD(&events, i);
b8aa1682 3458
f385ae0a
MD		 3459 health_code_update();
3460
b8aa1682
JD		 3461 /* Thread quit pipe has been closed. Killing thread. */
3462 ret = check_thread_quit_pipe(pollfd, revents);
3463 if (ret) {
095a4ae5
MD		 3464 err = 0;
3465 goto exit;
b8aa1682
JD		 3466 }
3467
58eb9381
DG		 3468 /* Inspect the relay conn pipe for new connection */
3469 if (pollfd == relay_conn_pipe[0]) {
03e43155 3470 if (revents & LPOLLIN) {
90e7d72f
JG		 3471 struct relay_connection *conn;
3472
58eb9381 3473 ret = lttng_read(relay_conn_pipe[0], &conn, sizeof(conn));
b8aa1682
JD		 3474 if (ret < 0) {
3475 goto error;
3476 }
73039936
FD		 3477 ret = lttng_poll_add(&events,
3478 conn->sock->fd,
58eb9381 3479 LPOLLIN | LPOLLRDHUP);
73039936
FD		 3480 if (ret) {
3481 ERR("Failed to add new connection file descriptor to poll set");
3482 goto error;
3483 }
7591bab1 3484 connection_ht_add(relay_connections_ht, conn);
58eb9381 3485 DBG("Connection socket %d added", conn->sock->fd);
03e43155
MD		 3486 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3487 ERR("Relay connection pipe error");
3488 goto error;
3489 } else {
3490 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
3491 goto error;
b8aa1682 3492 }
58eb9381 3493 } else {
90e7d72f
JG		 3494 struct relay_connection *ctrl_conn;
3495
7591bab1 3496 ctrl_conn = connection_get_by_sock(relay_connections_ht, pollfd);
58eb9381 3497 /* If not found, there is a synchronization issue. */
90e7d72f 3498 assert(ctrl_conn);
58eb9381 3499
03e43155
MD		 3500 if (ctrl_conn->type == RELAY_DATA) {
3501 if (revents & LPOLLIN) {
beaad64c
DG		 3502 /*
3503 * Flag the last seen data fd not deleted. It will be
3504 * used as the last seen fd if any fd gets deleted in
3505 * this first loop.
3506 */
3507 last_notdel_data_fd = pollfd;
3508 }
03e43155
MD		 3509 goto put_ctrl_connection;
3510 }
3511 assert(ctrl_conn->type == RELAY_CONTROL);
3512
3513 if (revents & LPOLLIN) {
5569b118
JG		 3514 enum relay_connection_status status;
3515
3516 status = relay_process_control(ctrl_conn);
3517 if (status != RELAY_CONNECTION_STATUS_OK) {
fd0f1e3e
JR		 3518 /*
3519 * On socket error flag the session as aborted to force
3520 * the cleanup of its stream otherwise it can leak
3521 * during the lifetime of the relayd.
3522 *
3523 * This prevents situations in which streams can be
3524 * left opened because an index was received, the
3525 * control connection is closed, and the data
3526 * connection is closed (uncleanly) before the packet's
3527 * data provided.
3528 *
3529 * Since the control connection encountered an error,
3530 * it is okay to be conservative and close the
3531 * session right now as we can't rely on the protocol
3532 * being respected anymore.
3533 */
3534 if (status == RELAY_CONNECTION_STATUS_ERROR) {
3535 session_abort(ctrl_conn->session);
3536 }
3537
5569b118 3538 /* Clear the connection on error or close. */
5312a3ed
JG		 3539 relay_thread_close_connection(&events,
3540 pollfd,
03e43155 3541 ctrl_conn);
03e43155 3542 }
5312a3ed 3543 seen_control = 1;
03e43155
MD		 3544 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3545 relay_thread_close_connection(&events,
3546 pollfd, ctrl_conn);
3547 if (last_seen_data_fd == pollfd) {
3548 last_seen_data_fd = last_notdel_data_fd;
3549 }
58eb9381 3550 } else {
03e43155
MD		 3551 ERR("Unexpected poll events %u for control sock %d",
3552 revents, pollfd);
3553 connection_put(ctrl_conn);
3554 goto error;
beaad64c 3555 }
03e43155 3556 put_ctrl_connection:
7591bab1 3557 connection_put(ctrl_conn);
beaad64c
DG		 3558 }
3559 }
3560
3561 /*
3562 * The last loop handled a control request, go back to poll to make
3563 * sure we prioritise the control socket.
3564 */
3565 if (seen_control) {
3566 continue;
3567 }
3568
3569 if (last_seen_data_fd >= 0) {
3570 for (i = 0; i < nb_fd; i++) {
3571 int pollfd = LTTNG_POLL_GETFD(&events, i);
f385ae0a
MD		 3572
3573 health_code_update();
3574
beaad64c
DG		 3575 if (last_seen_data_fd == pollfd) {
3576 idx = i;
3577 break;
3578 }
3579 }
3580 }
3581
3582 /* Process data connection. */
3583 for (i = idx + 1; i < nb_fd; i++) {
3584 /* Fetch the poll data. */
3585 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
3586 int pollfd = LTTNG_POLL_GETFD(&events, i);
90e7d72f 3587 struct relay_connection *data_conn;
beaad64c 3588
f385ae0a
MD		 3589 health_code_update();
3590
fd20dac9
MD		 3591 if (!revents) {
3592 /* No activity for this FD (poll implementation). */
3593 continue;
3594 }
3595
beaad64c 3596 /* Skip the command pipe. It's handled in the first loop. */
58eb9381 3597 if (pollfd == relay_conn_pipe[0]) {
beaad64c
DG		 3598 continue;
3599 }
3600
7591bab1 3601 data_conn = connection_get_by_sock(relay_connections_ht, pollfd);
90e7d72f 3602 if (!data_conn) {
fd20dac9 3603 /* Skip it. Might be removed before. */
fd20dac9
MD		 3604 continue;
3605 }
03e43155
MD		 3606 if (data_conn->type == RELAY_CONTROL) {
3607 goto put_data_connection;
3608 }
3609 assert(data_conn->type == RELAY_DATA);
fd20dac9
MD		 3610
3611 if (revents & LPOLLIN) {
5569b118
JG		 3612 enum relay_connection_status status;
3613
3614 status = relay_process_data(data_conn);
3615 /* Connection closed or error. */
3616 if (status != RELAY_CONNECTION_STATUS_OK) {
fd0f1e3e
JR		 3617 /*
3618 * On socket error flag the session as aborted to force
3619 * the cleanup of its stream otherwise it can leak
3620 * during the lifetime of the relayd.
3621 *
3622 * This prevents situations in which streams can be
3623 * left opened because an index was received, the
3624 * control connection is closed, and the data
3625 * connection is closed (uncleanly) before the packet's
3626 * data provided.
3627 *
3628 * Since the data connection encountered an error,
3629 * it is okay to be conservative and close the
3630 * session right now as we can't rely on the protocol
3631 * being respected anymore.
3632 */
3633 if (status == RELAY_CONNECTION_STATUS_ERROR) {
3634 session_abort(data_conn->session);
3635 }
7591bab1 3636 relay_thread_close_connection(&events, pollfd,
03e43155 3637 data_conn);
fd20dac9
MD		 3638 /*
3639 * Every goto restart call sets the last seen fd where
3640 * here we don't really care since we gracefully
3641 * continue the loop after the connection is deleted.
3642 */
3643 } else {
3644 /* Keep last seen port. */
3645 last_seen_data_fd = pollfd;
7591bab1 3646 connection_put(data_conn);
fd20dac9 3647 goto restart;
b8aa1682 3648 }
03e43155
MD		 3649 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3650 relay_thread_close_connection(&events, pollfd,
3651 data_conn);
3652 } else {
3653 ERR("Unknown poll events %u for data sock %d",
3654 revents, pollfd);
b8aa1682 3655 }
03e43155 3656 put_data_connection:
7591bab1 3657 connection_put(data_conn);
b8aa1682 3658 }
beaad64c 3659 last_seen_data_fd = -1;
b8aa1682
JD		 3660 }
3661
f385ae0a
MD		 3662 /* Normal exit, no error */
3663 ret = 0;
3664
095a4ae5 3665exit:
b8aa1682 3666error:
71efa8ef 3667 /* Cleanup remaining connection object. */
9d1bbf21 3668 rcu_read_lock();
90e7d72f
JG		 3669 cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter,
3670 destroy_conn,
58eb9381 3671 sock_n.node) {
f385ae0a 3672 health_code_update();
98ba050e 3673
fd0f1e3e 3674 session_abort(destroy_conn->session);
98ba050e 3675
7591bab1
MD		 3676 /*
3677 * No need to grab another ref, because we own
3678 * destroy_conn.
3679 */
3680 relay_thread_close_connection(&events, destroy_conn->sock->fd,
3681 destroy_conn);
b8aa1682 3682 }
94d49140 3683 rcu_read_unlock();
7591bab1
MD		 3684
3685 lttng_poll_clean(&events);
7d2f7452 3686error_poll_create:
b8aa1682 3687 lttng_ht_destroy(relay_connections_ht);
095a4ae5 3688relay_connections_ht_error:
58eb9381
DG		 3689 /* Close relay conn pipes */
3690 utils_close_pipe(relay_conn_pipe);
095a4ae5
MD		 3691 if (err) {
3692 DBG("Thread exited with error");
3693 }
b8aa1682 3694 DBG("Worker thread cleanup complete");
9b5e0863 3695error_testpoint:
f385ae0a
MD		 3696 if (err) {
3697 health_error();
3698 ERR("Health error occurred in %s", __func__);
3699 }
3700 health_unregister(health_relayd);
9d1bbf21 3701 rcu_unregister_thread();
b4aacfdc 3702 lttng_relay_stop_threads();
b8aa1682
JD		 3703 return NULL;
3704}
3705
3706/*
3707 * Create the relay command pipe to wake thread_manage_apps.
3708 * Closed in cleanup().
3709 */
58eb9381 3710static int create_relay_conn_pipe(void)
b8aa1682 3711{
a02de639 3712 int ret;
b8aa1682 3713
58eb9381 3714 ret = utils_create_pipe_cloexec(relay_conn_pipe);
b8aa1682 3715
b8aa1682
JD		 3716 return ret;
3717}
3718
3719/*
3720 * main
3721 */
3722int main(int argc, char **argv)
3723{
178a0557 3724 int ret = 0, retval = 0;
b8aa1682
JD		 3725 void *status;
3726
2a10de3b
JR		 3727 /* Parse environment variables */
3728 ret = parse_env_options();
3729 if (ret) {
3730 retval = -1;
3731 goto exit_options;
3732 }
3733
3734 /*
3735 * Parse arguments.
3736 * Command line arguments overwrite environment.
3737 */
b8aa1682 3738 progname = argv[0];
178a0557
MD		 3739 if (set_options(argc, argv)) {
3740 retval = -1;
3741 goto exit_options;
b8aa1682
JD		 3742 }
3743
178a0557
MD		 3744 if (set_signal_handler()) {
3745 retval = -1;
3746 goto exit_options;
b8aa1682
JD		 3747 }
3748
a3bc3918
JR		 3749 relayd_config_log();
3750
3751 if (opt_print_version) {
3752 print_version();
3753 retval = 0;
3754 goto exit_options;
3755 }
3756
4d513a50
DG		 3757 /* Try to create directory if -o, --output is specified. */
3758 if (opt_output_path) {
994fa64f
DG		 3759 if (*opt_output_path != '/') {
3760 ERR("Please specify an absolute path for -o, --output PATH");
178a0557
MD		 3761 retval = -1;
3762 goto exit_options;
994fa64f
DG		 3763 }
3764
d77dded2
JG		 3765 ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG,
3766 -1, -1);
4d513a50
DG		 3767 if (ret < 0) {
3768 ERR("Unable to create %s", opt_output_path);
178a0557
MD		 3769 retval = -1;
3770 goto exit_options;
4d513a50
DG		 3771 }
3772 }
3773
b8aa1682 3774 /* Daemonize */
b5218ffb 3775 if (opt_daemon || opt_background) {
3fd27398
MD		 3776 int i;
3777
3778 ret = lttng_daemonize(&child_ppid, &recv_child_signal,
3779 !opt_background);
b8aa1682 3780 if (ret < 0) {
178a0557
MD		 3781 retval = -1;
3782 goto exit_options;
b8aa1682 3783 }
3fd27398
MD		 3784
3785 /*
3786 * We are in the child. Make sure all other file
3787 * descriptors are closed, in case we are called with
3788 * more opened file descriptors than the standard ones.
3789 */
3790 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
3791 (void) close(i);
3792 }
3793 }
3794
ce9ee1fb
JR		 3795 if (opt_working_directory) {
3796 ret = utils_change_working_directory(opt_working_directory);
3797 if (ret) {
3798 /* All errors are already logged. */
3799 goto exit_options;
3800 }
3801 }
3802
23c8ff50
JG		 3803 sessiond_trace_chunk_registry = sessiond_trace_chunk_registry_create();
3804 if (!sessiond_trace_chunk_registry) {
3805 ERR("Failed to initialize session daemon trace chunk registry");
3806 retval = -1;
3807 goto exit_sessiond_trace_chunk_registry;
3808 }
3809
178a0557
MD		 3810 /* Initialize thread health monitoring */
3811 health_relayd = health_app_create(NR_HEALTH_RELAYD_TYPES);
3812 if (!health_relayd) {
3813 PERROR("health_app_create error");
3814 retval = -1;
3815 goto exit_health_app_create;
3816 }
3817
3fd27398 3818 /* Create thread quit pipe */
178a0557
MD		 3819 if (init_thread_quit_pipe()) {
3820 retval = -1;
3821 goto exit_init_data;
b8aa1682
JD		 3822 }
3823
b8aa1682 3824 /* Setup the thread apps communication pipe. */
178a0557
MD		 3825 if (create_relay_conn_pipe()) {
3826 retval = -1;
3827 goto exit_init_data;
b8aa1682
JD		 3828 }
3829
3830 /* Init relay command queue. */
8bdee6e2 3831 cds_wfcq_init(&relay_conn_queue.head, &relay_conn_queue.tail);
b8aa1682 3832
554831e7
MD		 3833 /* Initialize communication library */
3834 lttcomm_init();
87e45c13 3835 lttcomm_inet_init();
554831e7 3836
d3e2ba59 3837 /* tables of sessions indexed by session ID */
7591bab1
MD		 3838 sessions_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
3839 if (!sessions_ht) {
178a0557
MD		 3840 retval = -1;
3841 goto exit_init_data;
d3e2ba59
JD		 3842 }
3843
3844 /* tables of streams indexed by stream ID */
2a174661 3845 relay_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d3e2ba59 3846 if (!relay_streams_ht) {
178a0557
MD		 3847 retval = -1;
3848 goto exit_init_data;
d3e2ba59
JD		 3849 }
3850
3851 /* tables of streams indexed by stream ID */
92c6ca54
DG		 3852 viewer_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
3853 if (!viewer_streams_ht) {
178a0557
MD		 3854 retval = -1;
3855 goto exit_init_data;
55706a7d
MD		 3856 }
3857
65931c8b 3858 ret = utils_create_pipe(health_quit_pipe);
178a0557
MD		 3859 if (ret) {
3860 retval = -1;
3861 goto exit_health_quit_pipe;
65931c8b
MD		 3862 }
3863
3864 /* Create thread to manage the client socket */
1a1a34b4 3865 ret = pthread_create(&health_thread, default_pthread_attr(),
65931c8b 3866 thread_manage_health, (void *) NULL);
178a0557
MD		 3867 if (ret) {
3868 errno = ret;
65931c8b 3869 PERROR("pthread_create health");
178a0557
MD		 3870 retval = -1;
3871 goto exit_health_thread;
65931c8b
MD		 3872 }
3873
b8aa1682 3874 /* Setup the dispatcher thread */
1a1a34b4 3875 ret = pthread_create(&dispatcher_thread, default_pthread_attr(),
b8aa1682 3876 relay_thread_dispatcher, (void *) NULL);
178a0557
MD		 3877 if (ret) {
3878 errno = ret;
b8aa1682 3879 PERROR("pthread_create dispatcher");
178a0557
MD		 3880 retval = -1;
3881 goto exit_dispatcher_thread;
b8aa1682
JD		 3882 }
3883
3884 /* Setup the worker thread */
1a1a34b4 3885 ret = pthread_create(&worker_thread, default_pthread_attr(),
7591bab1 3886 relay_thread_worker, NULL);
178a0557
MD		 3887 if (ret) {
3888 errno = ret;
b8aa1682 3889 PERROR("pthread_create worker");
178a0557
MD		 3890 retval = -1;
3891 goto exit_worker_thread;
b8aa1682
JD		 3892 }
3893
3894 /* Setup the listener thread */
1a1a34b4 3895 ret = pthread_create(&listener_thread, default_pthread_attr(),
b8aa1682 3896 relay_thread_listener, (void *) NULL);
178a0557
MD		 3897 if (ret) {
3898 errno = ret;
b8aa1682 3899 PERROR("pthread_create listener");
178a0557
MD		 3900 retval = -1;
3901 goto exit_listener_thread;
b8aa1682
JD		 3902 }
3903
7591bab1 3904 ret = relayd_live_create(live_uri);
178a0557 3905 if (ret) {
d3e2ba59 3906 ERR("Starting live viewer threads");
178a0557 3907 retval = -1;
50138f51 3908 goto exit_live;
d3e2ba59
JD		 3909 }
3910
178a0557
MD		 3911 /*
3912 * This is where we start awaiting program completion (e.g. through
3913 * signal that asks threads to teardown).
3914 */
3915
3916 ret = relayd_live_join();
3917 if (ret) {
3918 retval = -1;
3919 }
50138f51 3920exit_live:
178a0557 3921
b8aa1682 3922 ret = pthread_join(listener_thread, &status);
178a0557
MD		 3923 if (ret) {
3924 errno = ret;
3925 PERROR("pthread_join listener_thread");
3926 retval = -1;
b8aa1682
JD		 3927 }
3928
178a0557 3929exit_listener_thread:
b8aa1682 3930 ret = pthread_join(worker_thread, &status);
178a0557
MD		 3931 if (ret) {
3932 errno = ret;
3933 PERROR("pthread_join worker_thread");
3934 retval = -1;
b8aa1682
JD		 3935 }
3936
178a0557 3937exit_worker_thread:
b8aa1682 3938 ret = pthread_join(dispatcher_thread, &status);
178a0557
MD		 3939 if (ret) {
3940 errno = ret;
3941 PERROR("pthread_join dispatcher_thread");
3942 retval = -1;
b8aa1682 3943 }
178a0557 3944exit_dispatcher_thread:
42415026 3945
65931c8b 3946 ret = pthread_join(health_thread, &status);
178a0557
MD		 3947 if (ret) {
3948 errno = ret;
3949 PERROR("pthread_join health_thread");
3950 retval = -1;
65931c8b 3951 }
178a0557 3952exit_health_thread:
65931c8b 3953
65931c8b 3954 utils_close_pipe(health_quit_pipe);
178a0557 3955exit_health_quit_pipe:
65931c8b 3956
178a0557 3957exit_init_data:
55706a7d 3958 health_app_destroy(health_relayd);
23c8ff50 3959 sessiond_trace_chunk_registry_destroy(sessiond_trace_chunk_registry);
55706a7d 3960exit_health_app_create:
23c8ff50 3961exit_sessiond_trace_chunk_registry:
178a0557 3962exit_options:
4d62fbf8
MD		 3963 /*
3964 * Wait for all pending call_rcu work to complete before tearing
3965 * down data structures. call_rcu worker may be trying to
3966 * perform lookups in those structures.
3967 */
3968 rcu_barrier();
7591bab1
MD		 3969 relayd_cleanup();
3970
3971 /* Ensure all prior call_rcu are done. */
3972 rcu_barrier();
d3e2ba59 3973
178a0557 3974 if (!retval) {
b8aa1682 3975 exit(EXIT_SUCCESS);
178a0557
MD		 3976 } else {
3977 exit(EXIT_FAILURE);
b8aa1682 3978 }
b8aa1682 3979}
LTTng 2.0 tools and control repository
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