relayd: track the health quit pipe with the fd-tracker
[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>
896010e3 37#include <sys/resource.h>
173af62f 38#include <inttypes.h>
b8aa1682
JD
39#include <urcu/futex.h>
40#include <urcu/uatomic.h>
70626904 41#include <urcu/rculist.h>
b8aa1682
JD
42#include <unistd.h>
43#include <fcntl.h>
f8be1183 44#include <strings.h>
896010e3 45#include <ctype.h>
b8aa1682
JD
46
47#include <lttng/lttng.h>
48#include <common/common.h>
49#include <common/compat/poll.h>
50#include <common/compat/socket.h>
f263b7fd 51#include <common/compat/endian.h>
e8fa9fb0 52#include <common/compat/getenv.h>
b8aa1682 53#include <common/defaults.h>
3fd27398 54#include <common/daemonize.h>
b8aa1682
JD
55#include <common/futex.h>
56#include <common/sessiond-comm/sessiond-comm.h>
57#include <common/sessiond-comm/inet.h>
b8aa1682
JD
58#include <common/sessiond-comm/relayd.h>
59#include <common/uri.h>
a02de639 60#include <common/utils.h>
d3ecc550 61#include <common/align.h>
f40ef1d5 62#include <common/config/session-config.h>
5312a3ed
JG
63#include <common/dynamic-buffer.h>
64#include <common/buffer-view.h>
70626904 65#include <common/string-utils/format.h>
00e3b7f1 66#include <common/fd-tracker/fd-tracker.h>
67609994 67#include <common/fd-tracker/utils.h>
b8aa1682 68
2a635488 69#include "backward-compatibility-group-by.h"
0f907de1 70#include "cmd.h"
2a635488 71#include "connection.h"
d3e2ba59 72#include "ctf-trace.h"
2a635488 73#include "health-relayd.h"
1c20f0e2 74#include "index.h"
d3e2ba59 75#include "live.h"
2a635488 76#include "lttng-relayd.h"
2a174661 77#include "session.h"
2a635488 78#include "sessiond-trace-chunks.h"
2a174661 79#include "stream.h"
f056029c 80#include "tcp_keep_alive.h"
2a635488
JR
81#include "testpoint.h"
82#include "tracefile-array.h"
83#include "utils.h"
84#include "version.h"
85#include "viewer-stream.h"
b8aa1682 86
4fc83d94
PP
87static const char *help_msg =
88#ifdef LTTNG_EMBED_HELP
89#include <lttng-relayd.8.h>
90#else
91NULL
92#endif
93;
94
5569b118
JG
95enum relay_connection_status {
96 RELAY_CONNECTION_STATUS_OK,
a9577b76 97 /* An error occurred while processing an event on the connection. */
5569b118
JG
98 RELAY_CONNECTION_STATUS_ERROR,
99 /* Connection closed/shutdown cleanly. */
100 RELAY_CONNECTION_STATUS_CLOSED,
101};
102
b8aa1682 103/* command line options */
ce9ee1fb 104char *opt_output_path, *opt_working_directory;
35ab25e5 105static int opt_daemon, opt_background, opt_print_version, opt_allow_clear = 1;
a8b66566 106enum relay_group_output_by opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_UNKNOWN;
3fd27398
MD
107
108/*
109 * We need to wait for listener and live listener threads, as well as
110 * health check thread, before being ready to signal readiness.
111 */
112#define NR_LTTNG_RELAY_READY 3
113static int lttng_relay_ready = NR_LTTNG_RELAY_READY;
0848dba7
MD
114
115/* Size of receive buffer. */
116#define RECV_DATA_BUFFER_SIZE 65536
117
3fd27398
MD
118static int recv_child_signal; /* Set to 1 when a SIGUSR1 signal is received. */
119static pid_t child_ppid; /* Internal parent PID use with daemonize. */
120
095a4ae5
MD
121static struct lttng_uri *control_uri;
122static struct lttng_uri *data_uri;
d3e2ba59 123static struct lttng_uri *live_uri;
b8aa1682
JD
124
125const char *progname;
b8aa1682 126
65931c8b 127const char *tracing_group_name = DEFAULT_TRACING_GROUP;
cd60b05a
JG
128static int tracing_group_name_override;
129
130const char * const config_section_name = "relayd";
65931c8b 131
b8aa1682
JD
132/*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
0b242f62 136int thread_quit_pipe[2] = { -1, -1 };
b8aa1682
JD
137
138/*
139 * This pipe is used to inform the worker thread that a command is queued and
140 * ready to be processed.
141 */
58eb9381 142static int relay_conn_pipe[2] = { -1, -1 };
b8aa1682 143
26c9d55e 144/* Shared between threads */
b8aa1682
JD
145static int dispatch_thread_exit;
146
147static pthread_t listener_thread;
148static pthread_t dispatcher_thread;
149static pthread_t worker_thread;
65931c8b 150static pthread_t health_thread;
b8aa1682 151
7591bab1
MD
152/*
153 * last_relay_stream_id_lock protects last_relay_stream_id increment
154 * atomicity on 32-bit architectures.
155 */
156static pthread_mutex_t last_relay_stream_id_lock = PTHREAD_MUTEX_INITIALIZER;
095a4ae5 157static uint64_t last_relay_stream_id;
b8aa1682
JD
158
159/*
160 * Relay command queue.
161 *
162 * The relay_thread_listener and relay_thread_dispatcher communicate with this
163 * queue.
164 */
58eb9381 165static struct relay_conn_queue relay_conn_queue;
b8aa1682 166
896010e3
JG
167/* Cap of file desriptors to be in simultaneous use by the relay daemon. */
168static unsigned int lttng_opt_fd_cap;
169
d3e2ba59
JD
170/* Global relay stream hash table. */
171struct lttng_ht *relay_streams_ht;
172
92c6ca54
DG
173/* Global relay viewer stream hash table. */
174struct lttng_ht *viewer_streams_ht;
175
7591bab1
MD
176/* Global relay sessions hash table. */
177struct lttng_ht *sessions_ht;
0a6518b0 178
55706a7d 179/* Relayd health monitoring */
eea7556c 180struct health_app *health_relayd;
55706a7d 181
23c8ff50
JG
182struct sessiond_trace_chunk_registry *sessiond_trace_chunk_registry;
183
00e3b7f1
JG
184/* Global fd tracker. */
185struct fd_tracker *the_fd_tracker;
186
cd60b05a
JG
187static struct option long_options[] = {
188 { "control-port", 1, 0, 'C', },
189 { "data-port", 1, 0, 'D', },
8d5c808e 190 { "live-port", 1, 0, 'L', },
cd60b05a 191 { "daemonize", 0, 0, 'd', },
b5218ffb 192 { "background", 0, 0, 'b', },
cd60b05a 193 { "group", 1, 0, 'g', },
896010e3 194 { "fd-cap", 1, 0, '\0', },
cd60b05a
JG
195 { "help", 0, 0, 'h', },
196 { "output", 1, 0, 'o', },
197 { "verbose", 0, 0, 'v', },
198 { "config", 1, 0, 'f' },
3a904098 199 { "version", 0, 0, 'V' },
ce9ee1fb 200 { "working-directory", 1, 0, 'w', },
a8b66566
JR
201 { "group-output-by-session", 0, 0, 's', },
202 { "group-output-by-host", 0, 0, 'p', },
35ab25e5 203 { "disallow-clear", 0, 0, 'x' },
cd60b05a
JG
204 { NULL, 0, 0, 0, },
205};
206
3a904098 207static const char *config_ignore_options[] = { "help", "config", "version" };
cd60b05a 208
a3bc3918
JR
209static void print_version(void) {
210 fprintf(stdout, "%s\n", VERSION);
211}
212
213static void relayd_config_log(void)
214{
215 DBG("LTTng-relayd " VERSION " - " VERSION_NAME "%s%s",
216 GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION,
217 EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME);
218 if (EXTRA_VERSION_DESCRIPTION[0] != '\0') {
219 DBG("LTTng-relayd extra version description:\n\t" EXTRA_VERSION_DESCRIPTION "\n");
220 }
7f5ed73a
JR
221 if (EXTRA_VERSION_PATCHES[0] != '\0') {
222 DBG("LTTng-relayd extra patches:\n\t" EXTRA_VERSION_PATCHES "\n");
223 }
a3bc3918
JR
224}
225
cd60b05a
JG
226/*
227 * Take an option from the getopt output and set it in the right variable to be
228 * used later.
229 *
230 * Return 0 on success else a negative value.
231 */
7591bab1 232static int set_option(int opt, const char *arg, const char *optname)
b8aa1682 233{
cd60b05a
JG
234 int ret;
235
236 switch (opt) {
237 case 0:
896010e3
JG
238 if (!strcmp(optname, "fd-cap")) {
239 unsigned long v;
240
241 errno = 0;
242 v = strtoul(arg, NULL, 0);
243 if (errno != 0 || !isdigit(arg[0])) {
244 ERR("Wrong value in --fd-cap parameter: %s",
245 arg);
246 ret = -1;
247 goto end;
248 }
249 if (v < DEFAULT_RELAYD_MINIMAL_FD_CAP) {
250 ERR("File descriptor cap must be set to at least %d",
251 DEFAULT_RELAYD_MINIMAL_FD_CAP);
252 }
253 if (v >= UINT_MAX) {
254 ERR("File descriptor cap overflow in --fd-cap parameter: %s",
255 arg);
256 ret = -1;
257 goto end;
258 }
259 lttng_opt_fd_cap = (unsigned int) v;
260 DBG3("File descriptor cap set to %u", lttng_opt_fd_cap);
261 } else {
262 fprintf(stderr, "unknown option %s", optname);
263 if (arg) {
264 fprintf(stderr, " with arg %s\n", arg);
265 }
cd60b05a
JG
266 }
267 break;
268 case 'C':
e8fa9fb0
MD
269 if (lttng_is_setuid_setgid()) {
270 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
271 "-C, --control-port");
272 } else {
273 ret = uri_parse(arg, &control_uri);
274 if (ret < 0) {
275 ERR("Invalid control URI specified");
276 goto end;
277 }
278 if (control_uri->port == 0) {
279 control_uri->port = DEFAULT_NETWORK_CONTROL_PORT;
280 }
cd60b05a
JG
281 }
282 break;
283 case 'D':
e8fa9fb0
MD
284 if (lttng_is_setuid_setgid()) {
285 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
286 "-D, -data-port");
287 } else {
288 ret = uri_parse(arg, &data_uri);
289 if (ret < 0) {
290 ERR("Invalid data URI specified");
291 goto end;
292 }
293 if (data_uri->port == 0) {
294 data_uri->port = DEFAULT_NETWORK_DATA_PORT;
295 }
cd60b05a
JG
296 }
297 break;
8d5c808e 298 case 'L':
e8fa9fb0
MD
299 if (lttng_is_setuid_setgid()) {
300 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
301 "-L, -live-port");
302 } else {
303 ret = uri_parse(arg, &live_uri);
304 if (ret < 0) {
305 ERR("Invalid live URI specified");
306 goto end;
307 }
308 if (live_uri->port == 0) {
309 live_uri->port = DEFAULT_NETWORK_VIEWER_PORT;
310 }
8d5c808e
AM
311 }
312 break;
cd60b05a
JG
313 case 'd':
314 opt_daemon = 1;
315 break;
b5218ffb
MD
316 case 'b':
317 opt_background = 1;
318 break;
cd60b05a 319 case 'g':
e8fa9fb0
MD
320 if (lttng_is_setuid_setgid()) {
321 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
322 "-g, --group");
323 } else {
324 tracing_group_name = strdup(arg);
325 if (tracing_group_name == NULL) {
326 ret = -errno;
327 PERROR("strdup");
328 goto end;
329 }
330 tracing_group_name_override = 1;
330a40bb 331 }
cd60b05a
JG
332 break;
333 case 'h':
4fc83d94 334 ret = utils_show_help(8, "lttng-relayd", help_msg);
655b5cc1 335 if (ret) {
4fc83d94 336 ERR("Cannot show --help for `lttng-relayd`");
655b5cc1
PP
337 perror("exec");
338 }
cd60b05a 339 exit(EXIT_FAILURE);
3a904098 340 case 'V':
a3bc3918
JR
341 opt_print_version = 1;
342 break;
cd60b05a 343 case 'o':
e8fa9fb0
MD
344 if (lttng_is_setuid_setgid()) {
345 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
346 "-o, --output");
347 } else {
348 ret = asprintf(&opt_output_path, "%s", arg);
349 if (ret < 0) {
350 ret = -errno;
351 PERROR("asprintf opt_output_path");
352 goto end;
353 }
cd60b05a
JG
354 }
355 break;
ce9ee1fb
JR
356 case 'w':
357 if (lttng_is_setuid_setgid()) {
358 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
359 "-w, --working-directory");
360 } else {
361 ret = asprintf(&opt_working_directory, "%s", arg);
362 if (ret < 0) {
363 ret = -errno;
364 PERROR("asprintf opt_working_directory");
365 goto end;
366 }
367 }
368 break;
369
cd60b05a
JG
370 case 'v':
371 /* Verbose level can increase using multiple -v */
372 if (arg) {
373 lttng_opt_verbose = config_parse_value(arg);
374 } else {
849e5b7b
DG
375 /* Only 3 level of verbosity (-vvv). */
376 if (lttng_opt_verbose < 3) {
377 lttng_opt_verbose += 1;
378 }
cd60b05a
JG
379 }
380 break;
a8b66566
JR
381 case 's':
382 if (opt_group_output_by != RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
383 ERR("Cannot set --group-output-by-session, another --group-output-by argument is present");
384 exit(EXIT_FAILURE);
385 }
386 opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_SESSION;
387 break;
388 case 'p':
389 if (opt_group_output_by != RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
390 ERR("Cannot set --group-output-by-host, another --group-output-by argument is present");
391 exit(EXIT_FAILURE);
392 }
393 opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
394 break;
35ab25e5
MD
395 case 'x':
396 /* Disallow clear */
397 opt_allow_clear = 0;
398 break;
cd60b05a
JG
399 default:
400 /* Unknown option or other error.
401 * Error is printed by getopt, just return */
402 ret = -1;
403 goto end;
404 }
405
406 /* All good. */
407 ret = 0;
408
409end:
410 return ret;
411}
412
413/*
414 * config_entry_handler_cb used to handle options read from a config file.
f40ef1d5 415 * See config_entry_handler_cb comment in common/config/session-config.h for the
cd60b05a
JG
416 * return value conventions.
417 */
7591bab1 418static int config_entry_handler(const struct config_entry *entry, void *unused)
cd60b05a
JG
419{
420 int ret = 0, i;
421
422 if (!entry || !entry->name || !entry->value) {
423 ret = -EINVAL;
424 goto end;
425 }
426
427 /* Check if the option is to be ignored */
428 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
429 if (!strcmp(entry->name, config_ignore_options[i])) {
430 goto end;
431 }
432 }
433
434 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
435 /* Ignore if entry name is not fully matched. */
436 if (strcmp(entry->name, long_options[i].name)) {
437 continue;
438 }
439
440 /*
7591bab1
MD
441 * If the option takes no argument on the command line,
442 * we have to check if the value is "true". We support
443 * non-zero numeric values, true, on and yes.
cd60b05a
JG
444 */
445 if (!long_options[i].has_arg) {
446 ret = config_parse_value(entry->value);
447 if (ret <= 0) {
448 if (ret) {
449 WARN("Invalid configuration value \"%s\" for option %s",
450 entry->value, entry->name);
451 }
452 /* False, skip boolean config option. */
453 goto end;
454 }
455 }
456
457 ret = set_option(long_options[i].val, entry->value, entry->name);
458 goto end;
459 }
460
461 WARN("Unrecognized option \"%s\" in daemon configuration file.",
462 entry->name);
463
464end:
465 return ret;
466}
467
2a10de3b
JR
468static int parse_env_options(void)
469{
470 int ret = 0;
471 char *value = NULL;
472
473 value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_WORKING_DIRECTORY_ENV);
474 if (value) {
475 opt_working_directory = strdup(value);
476 if (!opt_working_directory) {
477 ERR("Failed to allocate working directory string (\"%s\")",
478 value);
479 ret = -1;
480 }
481 }
482 return ret;
483}
484
7591bab1 485static int set_options(int argc, char **argv)
cd60b05a 486{
178a0557 487 int c, ret = 0, option_index = 0, retval = 0;
cd60b05a
JG
488 int orig_optopt = optopt, orig_optind = optind;
489 char *default_address, *optstring;
490 const char *config_path = NULL;
491
492 optstring = utils_generate_optstring(long_options,
493 sizeof(long_options) / sizeof(struct option));
494 if (!optstring) {
178a0557 495 retval = -ENOMEM;
cd60b05a
JG
496 goto exit;
497 }
498
499 /* Check for the --config option */
500
501 while ((c = getopt_long(argc, argv, optstring, long_options,
502 &option_index)) != -1) {
503 if (c == '?') {
178a0557 504 retval = -EINVAL;
cd60b05a
JG
505 goto exit;
506 } else if (c != 'f') {
507 continue;
508 }
509
e8fa9fb0
MD
510 if (lttng_is_setuid_setgid()) {
511 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
512 "-f, --config");
513 } else {
514 config_path = utils_expand_path(optarg);
515 if (!config_path) {
516 ERR("Failed to resolve path: %s", optarg);
517 }
cd60b05a
JG
518 }
519 }
520
521 ret = config_get_section_entries(config_path, config_section_name,
522 config_entry_handler, NULL);
523 if (ret) {
524 if (ret > 0) {
525 ERR("Invalid configuration option at line %i", ret);
cd60b05a 526 }
178a0557 527 retval = -1;
cd60b05a
JG
528 goto exit;
529 }
b8aa1682 530
cd60b05a
JG
531 /* Reset getopt's global state */
532 optopt = orig_optopt;
533 optind = orig_optind;
b8aa1682 534 while (1) {
cd60b05a 535 c = getopt_long(argc, argv, optstring, long_options, &option_index);
b8aa1682
JD
536 if (c == -1) {
537 break;
538 }
539
cd60b05a
JG
540 ret = set_option(c, optarg, long_options[option_index].name);
541 if (ret < 0) {
178a0557 542 retval = -1;
b8aa1682
JD
543 goto exit;
544 }
545 }
546
547 /* assign default values */
548 if (control_uri == NULL) {
fa91dc52
MD
549 ret = asprintf(&default_address,
550 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS ":%d",
551 DEFAULT_NETWORK_CONTROL_PORT);
b8aa1682
JD
552 if (ret < 0) {
553 PERROR("asprintf default data address");
178a0557 554 retval = -1;
b8aa1682
JD
555 goto exit;
556 }
557
558 ret = uri_parse(default_address, &control_uri);
559 free(default_address);
560 if (ret < 0) {
561 ERR("Invalid control URI specified");
178a0557 562 retval = -1;
b8aa1682
JD
563 goto exit;
564 }
565 }
566 if (data_uri == NULL) {
fa91dc52
MD
567 ret = asprintf(&default_address,
568 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS ":%d",
569 DEFAULT_NETWORK_DATA_PORT);
b8aa1682
JD
570 if (ret < 0) {
571 PERROR("asprintf default data address");
178a0557 572 retval = -1;
b8aa1682
JD
573 goto exit;
574 }
575
576 ret = uri_parse(default_address, &data_uri);
577 free(default_address);
578 if (ret < 0) {
579 ERR("Invalid data URI specified");
178a0557 580 retval = -1;
b8aa1682
JD
581 goto exit;
582 }
583 }
d3e2ba59 584 if (live_uri == NULL) {
fa91dc52
MD
585 ret = asprintf(&default_address,
586 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS ":%d",
587 DEFAULT_NETWORK_VIEWER_PORT);
d3e2ba59
JD
588 if (ret < 0) {
589 PERROR("asprintf default viewer control address");
178a0557 590 retval = -1;
d3e2ba59
JD
591 goto exit;
592 }
593
594 ret = uri_parse(default_address, &live_uri);
595 free(default_address);
596 if (ret < 0) {
597 ERR("Invalid viewer control URI specified");
178a0557 598 retval = -1;
d3e2ba59
JD
599 goto exit;
600 }
601 }
896010e3
JG
602 if (lttng_opt_fd_cap == 0) {
603 int ret;
604 struct rlimit rlimit;
605
606 ret = getrlimit(RLIMIT_NOFILE, &rlimit);
607 if (ret) {
608 PERROR("Failed to get file descriptor limit");
609 retval = -1;
610 }
611
612 lttng_opt_fd_cap = rlimit.rlim_cur;
613 }
b8aa1682 614
a8b66566
JR
615 if (opt_group_output_by == RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
616 opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
617 }
35ab25e5
MD
618 if (opt_allow_clear) {
619 /* Check if env variable exists. */
620 const char *value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
621 if (value) {
622 ret = config_parse_value(value);
623 if (ret < 0) {
624 ERR("Invalid value for %s specified", DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
625 retval = -1;
626 goto exit;
627 }
628 opt_allow_clear = !ret;
629 }
630 }
a8b66566 631
b8aa1682 632exit:
cd60b05a 633 free(optstring);
178a0557 634 return retval;
b8aa1682
JD
635}
636
7591bab1
MD
637static void print_global_objects(void)
638{
7591bab1
MD
639 print_viewer_streams();
640 print_relay_streams();
641 print_sessions();
7591bab1
MD
642}
643
b8aa1682
JD
644/*
645 * Cleanup the daemon
646 */
7591bab1 647static void relayd_cleanup(void)
b8aa1682 648{
7591bab1
MD
649 print_global_objects();
650
b8aa1682
JD
651 DBG("Cleaning up");
652
178a0557
MD
653 if (viewer_streams_ht)
654 lttng_ht_destroy(viewer_streams_ht);
655 if (relay_streams_ht)
656 lttng_ht_destroy(relay_streams_ht);
7591bab1
MD
657 if (sessions_ht)
658 lttng_ht_destroy(sessions_ht);
178a0557 659
095a4ae5 660 free(opt_output_path);
ce9ee1fb 661 free(opt_working_directory);
095a4ae5 662
794e2e5f
JG
663 if (health_relayd) {
664 health_app_destroy(health_relayd);
665 }
a02de639 666 /* Close thread quit pipes */
bcee2b96
JG
667 if (health_quit_pipe[0] != -1) {
668 (void) fd_tracker_util_pipe_close(
669 the_fd_tracker, health_quit_pipe);
670 }
67609994
JG
671 if (thread_quit_pipe[0] != -1) {
672 (void) fd_tracker_util_pipe_close(
673 the_fd_tracker, thread_quit_pipe);
674 }
794e2e5f
JG
675 if (sessiond_trace_chunk_registry) {
676 sessiond_trace_chunk_registry_destroy(
677 sessiond_trace_chunk_registry);
678 }
00e3b7f1
JG
679 if (the_fd_tracker) {
680 fd_tracker_destroy(the_fd_tracker);
681 }
794e2e5f 682
710c1f73
DG
683 uri_free(control_uri);
684 uri_free(data_uri);
8d5c808e 685 /* Live URI is freed in the live thread. */
cd60b05a
JG
686
687 if (tracing_group_name_override) {
688 free((void *) tracing_group_name);
689 }
00e3b7f1 690 fd_tracker_log(the_fd_tracker);
b8aa1682
JD
691}
692
693/*
694 * Write to writable pipe used to notify a thread.
695 */
7591bab1 696static int notify_thread_pipe(int wpipe)
b8aa1682 697{
6cd525e8 698 ssize_t ret;
b8aa1682 699
6cd525e8
MD
700 ret = lttng_write(wpipe, "!", 1);
701 if (ret < 1) {
b8aa1682 702 PERROR("write poll pipe");
b4aacfdc 703 goto end;
b8aa1682 704 }
b4aacfdc
MD
705 ret = 0;
706end:
b8aa1682
JD
707 return ret;
708}
709
7591bab1 710static int notify_health_quit_pipe(int *pipe)
65931c8b 711{
6cd525e8 712 ssize_t ret;
65931c8b 713
6cd525e8
MD
714 ret = lttng_write(pipe[1], "4", 1);
715 if (ret < 1) {
65931c8b 716 PERROR("write relay health quit");
b4aacfdc 717 goto end;
65931c8b 718 }
b4aacfdc
MD
719 ret = 0;
720end:
721 return ret;
65931c8b
MD
722}
723
b8aa1682 724/*
b4aacfdc 725 * Stop all relayd and relayd-live threads.
b8aa1682 726 */
b4aacfdc 727int lttng_relay_stop_threads(void)
b8aa1682 728{
b4aacfdc 729 int retval = 0;
b8aa1682
JD
730
731 /* Stopping all threads */
732 DBG("Terminating all threads");
b4aacfdc 733 if (notify_thread_pipe(thread_quit_pipe[1])) {
b8aa1682 734 ERR("write error on thread quit pipe");
b4aacfdc 735 retval = -1;
b8aa1682
JD
736 }
737
b4aacfdc
MD
738 if (notify_health_quit_pipe(health_quit_pipe)) {
739 ERR("write error on health quit pipe");
740 }
65931c8b 741
b8aa1682 742 /* Dispatch thread */
26c9d55e 743 CMM_STORE_SHARED(dispatch_thread_exit, 1);
58eb9381 744 futex_nto1_wake(&relay_conn_queue.futex);
178a0557 745
b4aacfdc 746 if (relayd_live_stop()) {
178a0557 747 ERR("Error stopping live threads");
b4aacfdc 748 retval = -1;
178a0557 749 }
b4aacfdc 750 return retval;
b8aa1682
JD
751}
752
753/*
754 * Signal handler for the daemon
755 *
756 * Simply stop all worker threads, leaving main() return gracefully after
757 * joining all threads and calling cleanup().
758 */
7591bab1 759static void sighandler(int sig)
b8aa1682
JD
760{
761 switch (sig) {
b8aa1682
JD
762 case SIGINT:
763 DBG("SIGINT caught");
b4aacfdc
MD
764 if (lttng_relay_stop_threads()) {
765 ERR("Error stopping threads");
766 }
b8aa1682
JD
767 break;
768 case SIGTERM:
769 DBG("SIGTERM caught");
b4aacfdc
MD
770 if (lttng_relay_stop_threads()) {
771 ERR("Error stopping threads");
772 }
b8aa1682 773 break;
3fd27398
MD
774 case SIGUSR1:
775 CMM_STORE_SHARED(recv_child_signal, 1);
776 break;
b8aa1682
JD
777 default:
778 break;
779 }
780}
781
782/*
783 * Setup signal handler for :
784 * SIGINT, SIGTERM, SIGPIPE
785 */
7591bab1 786static int set_signal_handler(void)
b8aa1682
JD
787{
788 int ret = 0;
789 struct sigaction sa;
790 sigset_t sigset;
791
792 if ((ret = sigemptyset(&sigset)) < 0) {
793 PERROR("sigemptyset");
794 return ret;
795 }
796
b8aa1682
JD
797 sa.sa_mask = sigset;
798 sa.sa_flags = 0;
0072e5e2
MD
799
800 sa.sa_handler = sighandler;
b8aa1682
JD
801 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
802 PERROR("sigaction");
803 return ret;
804 }
805
806 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
807 PERROR("sigaction");
808 return ret;
809 }
810
0072e5e2 811 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
b8aa1682
JD
812 PERROR("sigaction");
813 return ret;
814 }
815
0072e5e2
MD
816 sa.sa_handler = SIG_IGN;
817 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3fd27398
MD
818 PERROR("sigaction");
819 return ret;
820 }
821
822 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
b8aa1682
JD
823
824 return ret;
825}
826
3fd27398
MD
827void lttng_relay_notify_ready(void)
828{
829 /* Notify the parent of the fork() process that we are ready. */
830 if (opt_daemon || opt_background) {
831 if (uatomic_sub_return(&lttng_relay_ready, 1) == 0) {
832 kill(child_ppid, SIGUSR1);
833 }
834 }
835}
836
b8aa1682
JD
837/*
838 * Init thread quit pipe.
839 *
840 * Return -1 on error or 0 if all pipes are created.
841 */
7591bab1 842static int init_thread_quit_pipe(void)
b8aa1682 843{
67609994
JG
844 return fd_tracker_util_pipe_open_cloexec(
845 the_fd_tracker, "Quit pipe", thread_quit_pipe);
b8aa1682
JD
846}
847
bcee2b96
JG
848/*
849 * Init health quit pipe.
850 *
851 * Return -1 on error or 0 if all pipes are created.
852 */
853static int init_health_quit_pipe(void)
854{
855 return fd_tracker_util_pipe_open_cloexec(the_fd_tracker,
856 "Health quit pipe", health_quit_pipe);
857}
858
b8aa1682
JD
859/*
860 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
861 */
7591bab1 862static int create_thread_poll_set(struct lttng_poll_event *events, int size)
b8aa1682
JD
863{
864 int ret;
865
866 if (events == NULL || size == 0) {
867 ret = -1;
868 goto error;
869 }
870
871 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
872 if (ret < 0) {
873 goto error;
874 }
875
876 /* Add quit pipe */
c7759e6a 877 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
b8aa1682
JD
878 if (ret < 0) {
879 goto error;
880 }
881
882 return 0;
883
884error:
885 return ret;
886}
887
888/*
889 * Check if the thread quit pipe was triggered.
890 *
891 * Return 1 if it was triggered else 0;
892 */
7591bab1 893static int check_thread_quit_pipe(int fd, uint32_t events)
b8aa1682
JD
894{
895 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
896 return 1;
897 }
898
899 return 0;
900}
901
902/*
903 * Create and init socket from uri.
904 */
7591bab1 905static struct lttcomm_sock *relay_socket_create(struct lttng_uri *uri)
b8aa1682
JD
906{
907 int ret;
908 struct lttcomm_sock *sock = NULL;
909
910 sock = lttcomm_alloc_sock_from_uri(uri);
911 if (sock == NULL) {
912 ERR("Allocating socket");
913 goto error;
914 }
915
916 ret = lttcomm_create_sock(sock);
917 if (ret < 0) {
918 goto error;
919 }
920 DBG("Listening on sock %d", sock->fd);
921
922 ret = sock->ops->bind(sock);
923 if (ret < 0) {
2288467f 924 PERROR("Failed to bind socket");
b8aa1682
JD
925 goto error;
926 }
927
928 ret = sock->ops->listen(sock, -1);
929 if (ret < 0) {
930 goto error;
931
932 }
933
934 return sock;
935
936error:
937 if (sock) {
938 lttcomm_destroy_sock(sock);
939 }
940 return NULL;
941}
942
943/*
944 * This thread manages the listening for new connections on the network
945 */
7591bab1 946static void *relay_thread_listener(void *data)
b8aa1682 947{
095a4ae5 948 int i, ret, pollfd, err = -1;
b8aa1682
JD
949 uint32_t revents, nb_fd;
950 struct lttng_poll_event events;
951 struct lttcomm_sock *control_sock, *data_sock;
952
b8aa1682
JD
953 DBG("[thread] Relay listener started");
954
55706a7d
MD
955 health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
956
f385ae0a
MD
957 health_code_update();
958
7591bab1 959 control_sock = relay_socket_create(control_uri);
b8aa1682 960 if (!control_sock) {
095a4ae5 961 goto error_sock_control;
b8aa1682
JD
962 }
963
7591bab1 964 data_sock = relay_socket_create(data_uri);
b8aa1682 965 if (!data_sock) {
095a4ae5 966 goto error_sock_relay;
b8aa1682
JD
967 }
968
969 /*
7591bab1
MD
970 * Pass 3 as size here for the thread quit pipe, control and
971 * data socket.
b8aa1682
JD
972 */
973 ret = create_thread_poll_set(&events, 3);
974 if (ret < 0) {
975 goto error_create_poll;
976 }
977
978 /* Add the control socket */
979 ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP);
980 if (ret < 0) {
981 goto error_poll_add;
982 }
983
984 /* Add the data socket */
985 ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP);
986 if (ret < 0) {
987 goto error_poll_add;
988 }
989
3fd27398
MD
990 lttng_relay_notify_ready();
991
9b5e0863
MD
992 if (testpoint(relayd_thread_listener)) {
993 goto error_testpoint;
994 }
995
b8aa1682 996 while (1) {
f385ae0a
MD
997 health_code_update();
998
b8aa1682
JD
999 DBG("Listener accepting connections");
1000
b8aa1682 1001restart:
f385ae0a 1002 health_poll_entry();
b8aa1682 1003 ret = lttng_poll_wait(&events, -1);
f385ae0a 1004 health_poll_exit();
b8aa1682
JD
1005 if (ret < 0) {
1006 /*
1007 * Restart interrupted system call.
1008 */
1009 if (errno == EINTR) {
1010 goto restart;
1011 }
1012 goto error;
1013 }
1014
0d9c5d77
DG
1015 nb_fd = ret;
1016
b8aa1682
JD
1017 DBG("Relay new connection received");
1018 for (i = 0; i < nb_fd; i++) {
f385ae0a
MD
1019 health_code_update();
1020
b8aa1682
JD
1021 /* Fetch once the poll data */
1022 revents = LTTNG_POLL_GETEV(&events, i);
1023 pollfd = LTTNG_POLL_GETFD(&events, i);
1024
1025 /* Thread quit pipe has been closed. Killing thread. */
1026 ret = check_thread_quit_pipe(pollfd, revents);
1027 if (ret) {
095a4ae5
MD
1028 err = 0;
1029 goto exit;
b8aa1682
JD
1030 }
1031
03e43155 1032 if (revents & LPOLLIN) {
4b7f17b2 1033 /*
7591bab1
MD
1034 * A new connection is requested, therefore a
1035 * sessiond/consumerd connection is allocated in
1036 * this thread, enqueued to a global queue and
1037 * dequeued (and freed) in the worker thread.
4b7f17b2 1038 */
58eb9381
DG
1039 int val = 1;
1040 struct relay_connection *new_conn;
4b7f17b2 1041 struct lttcomm_sock *newsock;
7591bab1 1042 enum connection_type type;
b8aa1682
JD
1043
1044 if (pollfd == data_sock->fd) {
7591bab1 1045 type = RELAY_DATA;
b8aa1682 1046 newsock = data_sock->ops->accept(data_sock);
58eb9381
DG
1047 DBG("Relay data connection accepted, socket %d",
1048 newsock->fd);
4b7f17b2
MD
1049 } else {
1050 assert(pollfd == control_sock->fd);
7591bab1 1051 type = RELAY_CONTROL;
b8aa1682 1052 newsock = control_sock->ops->accept(control_sock);
58eb9381
DG
1053 DBG("Relay control connection accepted, socket %d",
1054 newsock->fd);
b8aa1682 1055 }
58eb9381
DG
1056 if (!newsock) {
1057 PERROR("accepting sock");
58eb9381
DG
1058 goto error;
1059 }
1060
1061 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
1062 sizeof(val));
b8aa1682
JD
1063 if (ret < 0) {
1064 PERROR("setsockopt inet");
4b7f17b2 1065 lttcomm_destroy_sock(newsock);
b8aa1682
JD
1066 goto error;
1067 }
f056029c
JR
1068
1069 ret = socket_apply_keep_alive_config(newsock->fd);
1070 if (ret < 0) {
1071 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
1072 newsock->fd);
1073 lttcomm_destroy_sock(newsock);
1074 goto error;
1075 }
1076
7591bab1
MD
1077 new_conn = connection_create(newsock, type);
1078 if (!new_conn) {
1079 lttcomm_destroy_sock(newsock);
1080 goto error;
1081 }
58eb9381
DG
1082
1083 /* Enqueue request for the dispatcher thread. */
8bdee6e2
SM
1084 cds_wfcq_enqueue(&relay_conn_queue.head, &relay_conn_queue.tail,
1085 &new_conn->qnode);
b8aa1682
JD
1086
1087 /*
7591bab1
MD
1088 * Wake the dispatch queue futex.
1089 * Implicit memory barrier with the
1090 * exchange in cds_wfcq_enqueue.
b8aa1682 1091 */
58eb9381 1092 futex_nto1_wake(&relay_conn_queue.futex);
03e43155
MD
1093 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1094 ERR("socket poll error");
1095 goto error;
1096 } else {
1097 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1098 goto error;
b8aa1682
JD
1099 }
1100 }
1101 }
1102
095a4ae5 1103exit:
b8aa1682
JD
1104error:
1105error_poll_add:
9b5e0863 1106error_testpoint:
b8aa1682
JD
1107 lttng_poll_clean(&events);
1108error_create_poll:
095a4ae5
MD
1109 if (data_sock->fd >= 0) {
1110 ret = data_sock->ops->close(data_sock);
b8aa1682
JD
1111 if (ret) {
1112 PERROR("close");
1113 }
b8aa1682 1114 }
095a4ae5
MD
1115 lttcomm_destroy_sock(data_sock);
1116error_sock_relay:
1117 if (control_sock->fd >= 0) {
1118 ret = control_sock->ops->close(control_sock);
b8aa1682
JD
1119 if (ret) {
1120 PERROR("close");
1121 }
b8aa1682 1122 }
095a4ae5
MD
1123 lttcomm_destroy_sock(control_sock);
1124error_sock_control:
1125 if (err) {
f385ae0a
MD
1126 health_error();
1127 ERR("Health error occurred in %s", __func__);
095a4ae5 1128 }
55706a7d 1129 health_unregister(health_relayd);
b8aa1682 1130 DBG("Relay listener thread cleanup complete");
b4aacfdc 1131 lttng_relay_stop_threads();
b8aa1682
JD
1132 return NULL;
1133}
1134
1135/*
1136 * This thread manages the dispatching of the requests to worker threads
1137 */
7591bab1 1138static void *relay_thread_dispatcher(void *data)
b8aa1682 1139{
6cd525e8
MD
1140 int err = -1;
1141 ssize_t ret;
8bdee6e2 1142 struct cds_wfcq_node *node;
58eb9381 1143 struct relay_connection *new_conn = NULL;
b8aa1682
JD
1144
1145 DBG("[thread] Relay dispatcher started");
1146
55706a7d
MD
1147 health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER);
1148
9b5e0863
MD
1149 if (testpoint(relayd_thread_dispatcher)) {
1150 goto error_testpoint;
1151 }
1152
f385ae0a
MD
1153 health_code_update();
1154
0ed3b1a8 1155 for (;;) {
f385ae0a
MD
1156 health_code_update();
1157
b8aa1682 1158 /* Atomically prepare the queue futex */
58eb9381 1159 futex_nto1_prepare(&relay_conn_queue.futex);
b8aa1682 1160
0ed3b1a8
MD
1161 if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
1162 break;
1163 }
1164
b8aa1682 1165 do {
f385ae0a
MD
1166 health_code_update();
1167
b8aa1682 1168 /* Dequeue commands */
8bdee6e2
SM
1169 node = cds_wfcq_dequeue_blocking(&relay_conn_queue.head,
1170 &relay_conn_queue.tail);
b8aa1682
JD
1171 if (node == NULL) {
1172 DBG("Woken up but nothing in the relay command queue");
1173 /* Continue thread execution */
1174 break;
1175 }
58eb9381 1176 new_conn = caa_container_of(node, struct relay_connection, qnode);
b8aa1682 1177
58eb9381 1178 DBG("Dispatching request waiting on sock %d", new_conn->sock->fd);
b8aa1682
JD
1179
1180 /*
7591bab1
MD
1181 * Inform worker thread of the new request. This
1182 * call is blocking so we can be assured that
1183 * the data will be read at some point in time
1184 * or wait to the end of the world :)
b8aa1682 1185 */
58eb9381
DG
1186 ret = lttng_write(relay_conn_pipe[1], &new_conn, sizeof(new_conn));
1187 if (ret < 0) {
1188 PERROR("write connection pipe");
7591bab1 1189 connection_put(new_conn);
b8aa1682
JD
1190 goto error;
1191 }
1192 } while (node != NULL);
1193
1194 /* Futex wait on queue. Blocking call on futex() */
f385ae0a 1195 health_poll_entry();
58eb9381 1196 futex_nto1_wait(&relay_conn_queue.futex);
f385ae0a 1197 health_poll_exit();
b8aa1682
JD
1198 }
1199
f385ae0a
MD
1200 /* Normal exit, no error */
1201 err = 0;
1202
b8aa1682 1203error:
9b5e0863 1204error_testpoint:
f385ae0a
MD
1205 if (err) {
1206 health_error();
1207 ERR("Health error occurred in %s", __func__);
1208 }
55706a7d 1209 health_unregister(health_relayd);
b8aa1682 1210 DBG("Dispatch thread dying");
b4aacfdc 1211 lttng_relay_stop_threads();
b8aa1682
JD
1212 return NULL;
1213}
1214
298a25ca
JG
1215static bool session_streams_have_index(const struct relay_session *session)
1216{
1217 return session->minor >= 4 && !session->snapshot;
1218}
1219
c5b6f4f0
DG
1220/*
1221 * Handle the RELAYD_CREATE_SESSION command.
1222 *
1223 * On success, send back the session id or else return a negative value.
1224 */
5312a3ed
JG
1225static int relay_create_session(const struct lttcomm_relayd_hdr *recv_hdr,
1226 struct relay_connection *conn,
1227 const struct lttng_buffer_view *payload)
c5b6f4f0 1228{
5312a3ed
JG
1229 int ret = 0;
1230 ssize_t send_ret;
4c6885d2 1231 struct relay_session *session = NULL;
ecd1a12f 1232 struct lttcomm_relayd_create_session_reply_2_11 reply = {};
1e791a74
JG
1233 char session_name[LTTNG_NAME_MAX] = {};
1234 char hostname[LTTNG_HOST_NAME_MAX] = {};
7591bab1
MD
1235 uint32_t live_timer = 0;
1236 bool snapshot = false;
46ef2188 1237 bool session_name_contains_creation_timestamp = false;
23c8ff50 1238 /* Left nil for peers < 2.11. */
6fa5fe7c 1239 char base_path[LTTNG_PATH_MAX] = {};
23c8ff50 1240 lttng_uuid sessiond_uuid = {};
1e791a74
JG
1241 LTTNG_OPTIONAL(uint64_t) id_sessiond = {};
1242 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
db1da059 1243 LTTNG_OPTIONAL(time_t) creation_time = {};
ecd1a12f
MD
1244 struct lttng_dynamic_buffer reply_payload;
1245
1246 lttng_dynamic_buffer_init(&reply_payload);
c5b6f4f0 1247
f86f6389
JR
1248 if (conn->minor < 4) {
1249 /* From 2.1 to 2.3 */
1250 ret = 0;
1251 } else if (conn->minor >= 4 && conn->minor < 11) {
1252 /* From 2.4 to 2.10 */
5312a3ed 1253 ret = cmd_create_session_2_4(payload, session_name,
7591bab1 1254 hostname, &live_timer, &snapshot);
f86f6389 1255 } else {
84fa4db5 1256 bool has_current_chunk;
db1da059
JG
1257 uint64_t current_chunk_id_value;
1258 time_t creation_time_value;
1259 uint64_t id_sessiond_value;
84fa4db5 1260
f86f6389 1261 /* From 2.11 to ... */
db1da059 1262 ret = cmd_create_session_2_11(payload, session_name, hostname,
6fa5fe7c 1263 base_path, &live_timer, &snapshot, &id_sessiond_value,
db1da059 1264 sessiond_uuid, &has_current_chunk,
46ef2188
MD
1265 &current_chunk_id_value, &creation_time_value,
1266 &session_name_contains_creation_timestamp);
23c8ff50
JG
1267 if (lttng_uuid_is_nil(sessiond_uuid)) {
1268 /* The nil UUID is reserved for pre-2.11 clients. */
1269 ERR("Illegal nil UUID announced by peer in create session command");
1270 ret = -1;
1271 goto send_reply;
1272 }
db1da059
JG
1273 LTTNG_OPTIONAL_SET(&id_sessiond, id_sessiond_value);
1274 LTTNG_OPTIONAL_SET(&creation_time, creation_time_value);
1275 if (has_current_chunk) {
1276 LTTNG_OPTIONAL_SET(&current_chunk_id,
1277 current_chunk_id_value);
1278 }
7591bab1 1279 }
f86f6389 1280
7591bab1
MD
1281 if (ret < 0) {
1282 goto send_reply;
d3e2ba59
JD
1283 }
1284
6fa5fe7c 1285 session = session_create(session_name, hostname, base_path, live_timer,
1e791a74
JG
1286 snapshot, sessiond_uuid,
1287 id_sessiond.is_set ? &id_sessiond.value : NULL,
1288 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
db1da059 1289 creation_time.is_set ? &creation_time.value : NULL,
46ef2188
MD
1290 conn->major, conn->minor,
1291 session_name_contains_creation_timestamp);
7591bab1
MD
1292 if (!session) {
1293 ret = -1;
1294 goto send_reply;
1295 }
1296 assert(!conn->session);
1297 conn->session = session;
c5b6f4f0
DG
1298 DBG("Created session %" PRIu64, session->id);
1299
ecd1a12f 1300 reply.generic.session_id = htobe64(session->id);
7591bab1
MD
1301
1302send_reply:
c5b6f4f0 1303 if (ret < 0) {
ecd1a12f 1304 reply.generic.ret_code = htobe32(LTTNG_ERR_FATAL);
c5b6f4f0 1305 } else {
ecd1a12f 1306 reply.generic.ret_code = htobe32(LTTNG_OK);
c5b6f4f0
DG
1307 }
1308
ecd1a12f
MD
1309 if (conn->minor < 11) {
1310 /* From 2.1 to 2.10 */
1311 ret = lttng_dynamic_buffer_append(&reply_payload,
1312 &reply.generic, sizeof(reply.generic));
1313 if (ret) {
1314 ERR("Failed to append \"create session\" command reply header to payload buffer");
1315 ret = -1;
1316 goto end;
1317 }
1318 } else {
1319 const uint32_t output_path_length =
8d382dd4 1320 session ? strlen(session->output_path) + 1 : 0;
ecd1a12f
MD
1321
1322 reply.output_path_length = htobe32(output_path_length);
8d382dd4
JG
1323 ret = lttng_dynamic_buffer_append(
1324 &reply_payload, &reply, sizeof(reply));
ecd1a12f
MD
1325 if (ret) {
1326 ERR("Failed to append \"create session\" command reply header to payload buffer");
1327 goto end;
1328 }
1329
8d382dd4
JG
1330 if (output_path_length) {
1331 ret = lttng_dynamic_buffer_append(&reply_payload,
1332 session->output_path,
1333 output_path_length);
1334 if (ret) {
1335 ERR("Failed to append \"create session\" command reply path to payload buffer");
1336 goto end;
1337 }
ecd1a12f
MD
1338 }
1339 }
1340
1341 send_ret = conn->sock->ops->sendmsg(conn->sock, reply_payload.data,
1342 reply_payload.size, 0);
1343 if (send_ret < (ssize_t) reply_payload.size) {
1344 ERR("Failed to send \"create session\" command reply of %zu bytes (ret = %zd)",
1345 reply_payload.size, send_ret);
5312a3ed 1346 ret = -1;
c5b6f4f0 1347 }
ecd1a12f 1348end:
4c6885d2
JG
1349 if (ret < 0 && session) {
1350 session_put(session);
1351 }
ecd1a12f 1352 lttng_dynamic_buffer_reset(&reply_payload);
c5b6f4f0
DG
1353 return ret;
1354}
1355
a4baae1b
JD
1356/*
1357 * When we have received all the streams and the metadata for a channel,
1358 * we make them visible to the viewer threads.
1359 */
7591bab1 1360static void publish_connection_local_streams(struct relay_connection *conn)
a4baae1b 1361{
7591bab1
MD
1362 struct relay_stream *stream;
1363 struct relay_session *session = conn->session;
a4baae1b 1364
7591bab1
MD
1365 /*
1366 * We publish all streams belonging to a session atomically wrt
1367 * session lock.
1368 */
1369 pthread_mutex_lock(&session->lock);
1370 rcu_read_lock();
1371 cds_list_for_each_entry_rcu(stream, &session->recv_list,
1372 recv_node) {
1373 stream_publish(stream);
a4baae1b 1374 }
7591bab1 1375 rcu_read_unlock();
a4baae1b 1376
7591bab1
MD
1377 /*
1378 * Inform the viewer that there are new streams in the session.
1379 */
1380 if (session->viewer_attached) {
1381 uatomic_set(&session->new_streams, 1);
1382 }
1383 pthread_mutex_unlock(&session->lock);
a4baae1b
JD
1384}
1385
348a81dc
JG
1386static int conform_channel_path(char *channel_path)
1387{
1388 int ret = 0;
1389
1390 if (strstr("../", channel_path)) {
1391 ERR("Refusing channel path as it walks up the path hierarchy: \"%s\"",
1392 channel_path);
1393 ret = -1;
1394 goto end;
1395 }
1396
1397 if (*channel_path == '/') {
1398 const size_t len = strlen(channel_path);
1399
1400 /*
1401 * Channel paths from peers prior to 2.11 are expressed as an
1402 * absolute path that is, in reality, relative to the relay
1403 * daemon's output directory. Remove the leading slash so it
1404 * is correctly interpreted as a relative path later on.
1405 *
1406 * len (and not len - 1) is used to copy the trailing NULL.
1407 */
1408 bcopy(channel_path + 1, channel_path, len);
1409 }
1410end:
1411 return ret;
1412}
1413
b8aa1682
JD
1414/*
1415 * relay_add_stream: allocate a new stream for a session
1416 */
5312a3ed
JG
1417static int relay_add_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1418 struct relay_connection *conn,
1419 const struct lttng_buffer_view *payload)
b8aa1682 1420{
7591bab1
MD
1421 int ret;
1422 ssize_t send_ret;
58eb9381 1423 struct relay_session *session = conn->session;
b8aa1682
JD
1424 struct relay_stream *stream = NULL;
1425 struct lttcomm_relayd_status_stream reply;
4030a636 1426 struct ctf_trace *trace = NULL;
7591bab1
MD
1427 uint64_t stream_handle = -1ULL;
1428 char *path_name = NULL, *channel_name = NULL;
1429 uint64_t tracefile_size = 0, tracefile_count = 0;
348a81dc 1430 LTTNG_OPTIONAL(uint64_t) stream_chunk_id = {};
b8aa1682 1431
5312a3ed 1432 if (!session || !conn->version_check_done) {
b8aa1682
JD
1433 ERR("Trying to add a stream before version check");
1434 ret = -1;
1435 goto end_no_session;
1436 }
1437
2f21a469
JR
1438 if (session->minor == 1) {
1439 /* For 2.1 */
5312a3ed 1440 ret = cmd_recv_stream_2_1(payload, &path_name,
7591bab1 1441 &channel_name);
2f21a469
JR
1442 } else if (session->minor > 1 && session->minor < 11) {
1443 /* From 2.2 to 2.10 */
5312a3ed 1444 ret = cmd_recv_stream_2_2(payload, &path_name,
7591bab1 1445 &channel_name, &tracefile_size, &tracefile_count);
2f21a469
JR
1446 } else {
1447 /* From 2.11 to ... */
1448 ret = cmd_recv_stream_2_11(payload, &path_name,
0b50e4b3
JG
1449 &channel_name, &tracefile_size, &tracefile_count,
1450 &stream_chunk_id.value);
1451 stream_chunk_id.is_set = true;
0f907de1 1452 }
2f21a469 1453
0f907de1 1454 if (ret < 0) {
7591bab1 1455 goto send_reply;
b8aa1682
JD
1456 }
1457
348a81dc
JG
1458 if (conform_channel_path(path_name)) {
1459 goto send_reply;
1460 }
1461
2a635488
JR
1462 /*
1463 * Backward compatibility for --group-output-by-session.
1464 * Prior to lttng 2.11, the complete path is passed by the stream.
1465 * Starting at 2.11, lttng-relayd uses chunk. When dealing with producer
1466 * >=2.11 the chunk is responsible for the output path. When dealing
1467 * with producer < 2.11 the chunk output_path is the root output path
1468 * and the stream carries the complete path (path_name).
1469 * To support --group-output-by-session with older producer (<2.11), we
1470 * need to craft the path based on the stream path.
1471 */
1472 if (opt_group_output_by == RELAYD_GROUP_OUTPUT_BY_SESSION) {
1473 if (conn->minor < 4) {
1474 /*
1475 * From 2.1 to 2.3, the session_name is not passed on
1476 * the RELAYD_CREATE_SESSION command. The session name
1477 * is necessary to detect the presence of a base_path
1478 * inside the stream path. Without it we cannot perform
1479 * a valid group-output-by-session transformation.
1480 */
1481 WARN("Unable to perform a --group-by-session transformation for session %" PRIu64
1482 " for stream with path \"%s\" as it is produced by a peer using a protocol older than v2.4",
1483 session->id, path_name);
1484 } else if (conn->minor >= 4 && conn->minor < 11) {
1485 char *group_by_session_path_name;
1486
1487 assert(session->session_name[0] != '\0');
1488
1489 group_by_session_path_name =
1490 backward_compat_group_by_session(
1491 path_name,
1492 session->session_name);
1493 if (!group_by_session_path_name) {
1494 ERR("Failed to apply group by session to stream of session %" PRIu64,
1495 session->id);
1496 goto send_reply;
1497 }
1498
1499 DBG("Transformed session path from \"%s\" to \"%s\" to honor per-session name grouping",
1500 path_name, group_by_session_path_name);
1501
1502 free(path_name);
1503 path_name = group_by_session_path_name;
1504 }
1505 }
1506
7591bab1 1507 trace = ctf_trace_get_by_path_or_create(session, path_name);
2a174661 1508 if (!trace) {
7591bab1 1509 goto send_reply;
2a174661 1510 }
2a174661 1511
2a635488 1512 /* This stream here has one reference on the trace. */
7591bab1
MD
1513 pthread_mutex_lock(&last_relay_stream_id_lock);
1514 stream_handle = ++last_relay_stream_id;
1515 pthread_mutex_unlock(&last_relay_stream_id_lock);
d3e2ba59 1516
7591bab1
MD
1517 /* We pass ownership of path_name and channel_name. */
1518 stream = stream_create(trace, stream_handle, path_name,
348a81dc 1519 channel_name, tracefile_size, tracefile_count);
7591bab1
MD
1520 path_name = NULL;
1521 channel_name = NULL;
a4baae1b 1522
2a174661 1523 /*
7591bab1
MD
1524 * Streams are the owners of their trace. Reference to trace is
1525 * kept within stream_create().
2a174661 1526 */
7591bab1 1527 ctf_trace_put(trace);
d3e2ba59 1528
7591bab1 1529send_reply:
53efb85a 1530 memset(&reply, 0, sizeof(reply));
7591bab1
MD
1531 reply.handle = htobe64(stream_handle);
1532 if (!stream) {
f73fabfd 1533 reply.ret_code = htobe32(LTTNG_ERR_UNK);
b8aa1682 1534 } else {
f73fabfd 1535 reply.ret_code = htobe32(LTTNG_OK);
b8aa1682 1536 }
5af40280 1537
58eb9381 1538 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
b8aa1682 1539 sizeof(struct lttcomm_relayd_status_stream), 0);
5312a3ed
JG
1540 if (send_ret < (ssize_t) sizeof(reply)) {
1541 ERR("Failed to send \"add stream\" command reply (ret = %zd)",
1542 send_ret);
1543 ret = -1;
b8aa1682
JD
1544 }
1545
1546end_no_session:
7591bab1
MD
1547 free(path_name);
1548 free(channel_name);
0f907de1 1549 return ret;
b8aa1682
JD
1550}
1551
173af62f
DG
1552/*
1553 * relay_close_stream: close a specific stream
1554 */
5312a3ed
JG
1555static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
1556 struct relay_connection *conn,
1557 const struct lttng_buffer_view *payload)
173af62f 1558{
5312a3ed
JG
1559 int ret;
1560 ssize_t send_ret;
58eb9381 1561 struct relay_session *session = conn->session;
173af62f
DG
1562 struct lttcomm_relayd_close_stream stream_info;
1563 struct lttcomm_relayd_generic_reply reply;
1564 struct relay_stream *stream;
173af62f
DG
1565
1566 DBG("Close stream received");
1567
5312a3ed 1568 if (!session || !conn->version_check_done) {
173af62f
DG
1569 ERR("Trying to close a stream before version check");
1570 ret = -1;
1571 goto end_no_session;
1572 }
1573
5312a3ed
JG
1574 if (payload->size < sizeof(stream_info)) {
1575 ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
1576 sizeof(stream_info), payload->size);
173af62f
DG
1577 ret = -1;
1578 goto end_no_session;
1579 }
5312a3ed
JG
1580 memcpy(&stream_info, payload->data, sizeof(stream_info));
1581 stream_info.stream_id = be64toh(stream_info.stream_id);
1582 stream_info.last_net_seq_num = be64toh(stream_info.last_net_seq_num);
173af62f 1583
5312a3ed 1584 stream = stream_get_by_id(stream_info.stream_id);
173af62f
DG
1585 if (!stream) {
1586 ret = -1;
7591bab1 1587 goto end;
173af62f 1588 }
77f7bd85
MD
1589
1590 /*
1591 * Set last_net_seq_num before the close flag. Required by data
1592 * pending check.
1593 */
7591bab1 1594 pthread_mutex_lock(&stream->lock);
5312a3ed 1595 stream->last_net_seq_num = stream_info.last_net_seq_num;
77f7bd85
MD
1596 pthread_mutex_unlock(&stream->lock);
1597
bda7c7b9
JG
1598 /*
1599 * This is one of the conditions which may trigger a stream close
1600 * with the others being:
1601 * 1) A close command is received for a stream
1602 * 2) The control connection owning the stream is closed
1603 * 3) We have received all of the stream's data _after_ a close
1604 * request.
1605 */
1606 try_stream_close(stream);
7591bab1
MD
1607 if (stream->is_metadata) {
1608 struct relay_viewer_stream *vstream;
173af62f 1609
7591bab1
MD
1610 vstream = viewer_stream_get_by_id(stream->stream_handle);
1611 if (vstream) {
94f73d08 1612 if (stream->no_new_metadata_notified) {
7591bab1
MD
1613 /*
1614 * Since all the metadata has been sent to the
1615 * viewer and that we have a request to close
1616 * its stream, we can safely teardown the
1617 * corresponding metadata viewer stream.
1618 */
1619 viewer_stream_put(vstream);
1620 }
1621 /* Put local reference. */
1622 viewer_stream_put(vstream);
1623 }
1624 }
7591bab1 1625 stream_put(stream);
5312a3ed 1626 ret = 0;
173af62f 1627
7591bab1 1628end:
53efb85a 1629 memset(&reply, 0, sizeof(reply));
173af62f 1630 if (ret < 0) {
f73fabfd 1631 reply.ret_code = htobe32(LTTNG_ERR_UNK);
173af62f 1632 } else {
f73fabfd 1633 reply.ret_code = htobe32(LTTNG_OK);
173af62f 1634 }
58eb9381 1635 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
173af62f 1636 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
1637 if (send_ret < (ssize_t) sizeof(reply)) {
1638 ERR("Failed to send \"close stream\" command reply (ret = %zd)",
1639 send_ret);
1640 ret = -1;
173af62f
DG
1641 }
1642
1643end_no_session:
1644 return ret;
1645}
1646
93ec662e
JD
1647/*
1648 * relay_reset_metadata: reset a metadata stream
1649 */
1650static
5312a3ed
JG
1651int relay_reset_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1652 struct relay_connection *conn,
1653 const struct lttng_buffer_view *payload)
93ec662e 1654{
5312a3ed
JG
1655 int ret;
1656 ssize_t send_ret;
93ec662e
JD
1657 struct relay_session *session = conn->session;
1658 struct lttcomm_relayd_reset_metadata stream_info;
1659 struct lttcomm_relayd_generic_reply reply;
1660 struct relay_stream *stream;
1661
1662 DBG("Reset metadata received");
1663
5312a3ed 1664 if (!session || !conn->version_check_done) {
93ec662e
JD
1665 ERR("Trying to reset a metadata stream before version check");
1666 ret = -1;
1667 goto end_no_session;
1668 }
1669
5312a3ed
JG
1670 if (payload->size < sizeof(stream_info)) {
1671 ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
1672 sizeof(stream_info), payload->size);
93ec662e
JD
1673 ret = -1;
1674 goto end_no_session;
1675 }
5312a3ed
JG
1676 memcpy(&stream_info, payload->data, sizeof(stream_info));
1677 stream_info.stream_id = be64toh(stream_info.stream_id);
1678 stream_info.version = be64toh(stream_info.version);
1679
1680 DBG("Update metadata to version %" PRIu64, stream_info.version);
93ec662e
JD
1681
1682 /* Unsupported for live sessions for now. */
1683 if (session->live_timer != 0) {
1684 ret = -1;
1685 goto end;
1686 }
1687
5312a3ed 1688 stream = stream_get_by_id(stream_info.stream_id);
93ec662e
JD
1689 if (!stream) {
1690 ret = -1;
1691 goto end;
1692 }
1693 pthread_mutex_lock(&stream->lock);
1694 if (!stream->is_metadata) {
1695 ret = -1;
1696 goto end_unlock;
1697 }
1698
c35f9726 1699 ret = stream_reset_file(stream);
93ec662e 1700 if (ret < 0) {
c35f9726
JG
1701 ERR("Failed to reset metadata stream %" PRIu64
1702 ": stream_path = %s, channel = %s",
1703 stream->stream_handle, stream->path_name,
1704 stream->channel_name);
93ec662e
JD
1705 goto end_unlock;
1706 }
93ec662e
JD
1707end_unlock:
1708 pthread_mutex_unlock(&stream->lock);
1709 stream_put(stream);
1710
1711end:
1712 memset(&reply, 0, sizeof(reply));
1713 if (ret < 0) {
1714 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1715 } else {
1716 reply.ret_code = htobe32(LTTNG_OK);
1717 }
1718 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1719 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
1720 if (send_ret < (ssize_t) sizeof(reply)) {
1721 ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
1722 send_ret);
1723 ret = -1;
93ec662e
JD
1724 }
1725
1726end_no_session:
1727 return ret;
1728}
1729
b8aa1682
JD
1730/*
1731 * relay_unknown_command: send -1 if received unknown command
1732 */
7591bab1 1733static void relay_unknown_command(struct relay_connection *conn)
b8aa1682
JD
1734{
1735 struct lttcomm_relayd_generic_reply reply;
5312a3ed 1736 ssize_t send_ret;
b8aa1682 1737
53efb85a 1738 memset(&reply, 0, sizeof(reply));
f73fabfd 1739 reply.ret_code = htobe32(LTTNG_ERR_UNK);
5312a3ed
JG
1740 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1741 if (send_ret < sizeof(reply)) {
1742 ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret);
b8aa1682
JD
1743 }
1744}
1745
1746/*
1747 * relay_start: send an acknowledgment to the client to tell if we are
1748 * ready to receive data. We are ready if a session is established.
1749 */
5312a3ed
JG
1750static int relay_start(const struct lttcomm_relayd_hdr *recv_hdr,
1751 struct relay_connection *conn,
1752 const struct lttng_buffer_view *payload)
b8aa1682 1753{
5312a3ed
JG
1754 int ret = 0;
1755 ssize_t send_ret;
b8aa1682 1756 struct lttcomm_relayd_generic_reply reply;
58eb9381 1757 struct relay_session *session = conn->session;
b8aa1682
JD
1758
1759 if (!session) {
1760 DBG("Trying to start the streaming without a session established");
f73fabfd 1761 ret = htobe32(LTTNG_ERR_UNK);
b8aa1682
JD
1762 }
1763
53efb85a 1764 memset(&reply, 0, sizeof(reply));
5312a3ed
JG
1765 reply.ret_code = htobe32(LTTNG_OK);
1766 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1767 sizeof(reply), 0);
1768 if (send_ret < (ssize_t) sizeof(reply)) {
1769 ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
1770 send_ret);
1771 ret = -1;
b8aa1682
JD
1772 }
1773
1774 return ret;
1775}
1776
b8aa1682 1777/*
7591bab1 1778 * relay_recv_metadata: receive the metadata for the session.
b8aa1682 1779 */
5312a3ed
JG
1780static int relay_recv_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
1781 struct relay_connection *conn,
1782 const struct lttng_buffer_view *payload)
b8aa1682 1783{
32d1569c 1784 int ret = 0;
58eb9381 1785 struct relay_session *session = conn->session;
5312a3ed 1786 struct lttcomm_relayd_metadata_payload metadata_payload_header;
b8aa1682 1787 struct relay_stream *metadata_stream;
5312a3ed 1788 uint64_t metadata_payload_size;
c35f9726 1789 struct lttng_buffer_view packet_view;
b8aa1682
JD
1790
1791 if (!session) {
1792 ERR("Metadata sent before version check");
1793 ret = -1;
1794 goto end;
1795 }
1796
5312a3ed 1797 if (recv_hdr->data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
f6416125
MD
1798 ERR("Incorrect data size");
1799 ret = -1;
1800 goto end;
1801 }
5312a3ed
JG
1802 metadata_payload_size = recv_hdr->data_size -
1803 sizeof(struct lttcomm_relayd_metadata_payload);
f6416125 1804
5312a3ed
JG
1805 memcpy(&metadata_payload_header, payload->data,
1806 sizeof(metadata_payload_header));
1807 metadata_payload_header.stream_id = be64toh(
1808 metadata_payload_header.stream_id);
1809 metadata_payload_header.padding_size = be32toh(
1810 metadata_payload_header.padding_size);
9d1bbf21 1811
5312a3ed 1812 metadata_stream = stream_get_by_id(metadata_payload_header.stream_id);
b8aa1682
JD
1813 if (!metadata_stream) {
1814 ret = -1;
7591bab1 1815 goto end;
b8aa1682
JD
1816 }
1817
c35f9726
JG
1818 packet_view = lttng_buffer_view_from_view(payload,
1819 sizeof(metadata_payload_header), metadata_payload_size);
1820 if (!packet_view.data) {
1821 ERR("Invalid metadata packet length announced by header");
b8aa1682 1822 ret = -1;
7591bab1 1823 goto end_put;
b8aa1682 1824 }
1d4dfdef 1825
c35f9726
JG
1826 pthread_mutex_lock(&metadata_stream->lock);
1827 ret = stream_write(metadata_stream, &packet_view,
5312a3ed 1828 metadata_payload_header.padding_size);
c35f9726
JG
1829 pthread_mutex_unlock(&metadata_stream->lock);
1830 if (ret){
5312a3ed 1831 ret = -1;
7591bab1 1832 goto end_put;
1d4dfdef 1833 }
7591bab1 1834end_put:
7591bab1 1835 stream_put(metadata_stream);
b8aa1682
JD
1836end:
1837 return ret;
1838}
1839
1840/*
1841 * relay_send_version: send relayd version number
1842 */
5312a3ed
JG
1843static int relay_send_version(const struct lttcomm_relayd_hdr *recv_hdr,
1844 struct relay_connection *conn,
1845 const struct lttng_buffer_view *payload)
b8aa1682 1846{
7f51dcba 1847 int ret;
5312a3ed 1848 ssize_t send_ret;
092b6259 1849 struct lttcomm_relayd_version reply, msg;
87cb6359 1850 bool compatible = true;
b8aa1682 1851
5312a3ed 1852 conn->version_check_done = true;
b8aa1682 1853
092b6259 1854 /* Get version from the other side. */
5312a3ed
JG
1855 if (payload->size < sizeof(msg)) {
1856 ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
1857 sizeof(msg), payload->size);
092b6259 1858 ret = -1;
092b6259
DG
1859 goto end;
1860 }
1861
5312a3ed
JG
1862 memcpy(&msg, payload->data, sizeof(msg));
1863 msg.major = be32toh(msg.major);
1864 msg.minor = be32toh(msg.minor);
1865
53efb85a 1866 memset(&reply, 0, sizeof(reply));
d83a952c
MD
1867 reply.major = RELAYD_VERSION_COMM_MAJOR;
1868 reply.minor = RELAYD_VERSION_COMM_MINOR;
d4519fa3
JD
1869
1870 /* Major versions must be the same */
5312a3ed 1871 if (reply.major != msg.major) {
6151a90f 1872 DBG("Incompatible major versions (%u vs %u), deleting session",
5312a3ed 1873 reply.major, msg.major);
87cb6359 1874 compatible = false;
d4519fa3
JD
1875 }
1876
58eb9381 1877 conn->major = reply.major;
0f907de1 1878 /* We adapt to the lowest compatible version */
5312a3ed 1879 if (reply.minor <= msg.minor) {
58eb9381 1880 conn->minor = reply.minor;
0f907de1 1881 } else {
5312a3ed 1882 conn->minor = msg.minor;
0f907de1
JD
1883 }
1884
6151a90f
JD
1885 reply.major = htobe32(reply.major);
1886 reply.minor = htobe32(reply.minor);
5312a3ed
JG
1887 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
1888 sizeof(reply), 0);
1889 if (send_ret < (ssize_t) sizeof(reply)) {
1890 ERR("Failed to send \"send version\" command reply (ret = %zd)",
1891 send_ret);
1892 ret = -1;
1893 goto end;
1894 } else {
1895 ret = 0;
6151a90f
JD
1896 }
1897
87cb6359
JD
1898 if (!compatible) {
1899 ret = -1;
1900 goto end;
1901 }
1902
58eb9381
DG
1903 DBG("Version check done using protocol %u.%u", conn->major,
1904 conn->minor);
b8aa1682
JD
1905
1906end:
1907 return ret;
1908}
1909
c8f59ee5 1910/*
6d805429 1911 * Check for data pending for a given stream id from the session daemon.
c8f59ee5 1912 */
5312a3ed
JG
1913static int relay_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
1914 struct relay_connection *conn,
1915 const struct lttng_buffer_view *payload)
c8f59ee5 1916{
58eb9381 1917 struct relay_session *session = conn->session;
6d805429 1918 struct lttcomm_relayd_data_pending msg;
c8f59ee5
DG
1919 struct lttcomm_relayd_generic_reply reply;
1920 struct relay_stream *stream;
5312a3ed 1921 ssize_t send_ret;
c8f59ee5 1922 int ret;
298a25ca 1923 uint64_t stream_seq;
c8f59ee5 1924
6d805429 1925 DBG("Data pending command received");
c8f59ee5 1926
5312a3ed 1927 if (!session || !conn->version_check_done) {
c8f59ee5
DG
1928 ERR("Trying to check for data before version check");
1929 ret = -1;
1930 goto end_no_session;
1931 }
1932
5312a3ed
JG
1933 if (payload->size < sizeof(msg)) {
1934 ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
1935 sizeof(msg), payload->size);
c8f59ee5
DG
1936 ret = -1;
1937 goto end_no_session;
1938 }
5312a3ed
JG
1939 memcpy(&msg, payload->data, sizeof(msg));
1940 msg.stream_id = be64toh(msg.stream_id);
1941 msg.last_net_seq_num = be64toh(msg.last_net_seq_num);
c8f59ee5 1942
5312a3ed 1943 stream = stream_get_by_id(msg.stream_id);
de91f48a 1944 if (stream == NULL) {
c8f59ee5 1945 ret = -1;
7591bab1 1946 goto end;
c8f59ee5
DG
1947 }
1948
7591bab1
MD
1949 pthread_mutex_lock(&stream->lock);
1950
298a25ca
JG
1951 if (session_streams_have_index(session)) {
1952 /*
1953 * Ensure that both the index and stream data have been
1954 * flushed up to the requested point.
1955 */
a8f9f353 1956 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 1957 } else {
a8f9f353 1958 stream_seq = stream->prev_data_seq;
298a25ca 1959 }
a8f9f353 1960 DBG("Data pending for stream id %" PRIu64 ": prev_data_seq %" PRIu64
298a25ca
JG
1961 ", prev_index_seq %" PRIu64
1962 ", and last_seq %" PRIu64, msg.stream_id,
a8f9f353 1963 stream->prev_data_seq, stream->prev_index_seq,
298a25ca 1964 msg.last_net_seq_num);
c8f59ee5 1965
33832e64 1966 /* Avoid wrapping issue */
298a25ca 1967 if (((int64_t) (stream_seq - msg.last_net_seq_num)) >= 0) {
6d805429 1968 /* Data has in fact been written and is NOT pending */
c8f59ee5 1969 ret = 0;
6d805429
DG
1970 } else {
1971 /* Data still being streamed thus pending */
1972 ret = 1;
c8f59ee5
DG
1973 }
1974
7591bab1
MD
1975 stream->data_pending_check_done = true;
1976 pthread_mutex_unlock(&stream->lock);
f7079f67 1977
7591bab1
MD
1978 stream_put(stream);
1979end:
c8f59ee5 1980
53efb85a 1981 memset(&reply, 0, sizeof(reply));
c8f59ee5 1982 reply.ret_code = htobe32(ret);
5312a3ed
JG
1983 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
1984 if (send_ret < (ssize_t) sizeof(reply)) {
1985 ERR("Failed to send \"data pending\" command reply (ret = %zd)",
1986 send_ret);
1987 ret = -1;
c8f59ee5
DG
1988 }
1989
1990end_no_session:
1991 return ret;
1992}
1993
1994/*
1995 * Wait for the control socket to reach a quiescent state.
1996 *
7591bab1
MD
1997 * Note that for now, when receiving this command from the session
1998 * daemon, this means that every subsequent commands or data received on
1999 * the control socket has been handled. So, this is why we simply return
2000 * OK here.
c8f59ee5 2001 */
5312a3ed
JG
2002static int relay_quiescent_control(const struct lttcomm_relayd_hdr *recv_hdr,
2003 struct relay_connection *conn,
2004 const struct lttng_buffer_view *payload)
c8f59ee5
DG
2005{
2006 int ret;
5312a3ed 2007 ssize_t send_ret;
ad7051c0 2008 struct relay_stream *stream;
ad7051c0 2009 struct lttcomm_relayd_quiescent_control msg;
c8f59ee5
DG
2010 struct lttcomm_relayd_generic_reply reply;
2011
2012 DBG("Checking quiescent state on control socket");
2013
5312a3ed 2014 if (!conn->session || !conn->version_check_done) {
ad7051c0
DG
2015 ERR("Trying to check for data before version check");
2016 ret = -1;
2017 goto end_no_session;
2018 }
2019
5312a3ed
JG
2020 if (payload->size < sizeof(msg)) {
2021 ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
2022 sizeof(msg), payload->size);
ad7051c0
DG
2023 ret = -1;
2024 goto end_no_session;
2025 }
5312a3ed
JG
2026 memcpy(&msg, payload->data, sizeof(msg));
2027 msg.stream_id = be64toh(msg.stream_id);
ad7051c0 2028
5312a3ed 2029 stream = stream_get_by_id(msg.stream_id);
7591bab1
MD
2030 if (!stream) {
2031 goto reply;
2032 }
2033 pthread_mutex_lock(&stream->lock);
2034 stream->data_pending_check_done = true;
2035 pthread_mutex_unlock(&stream->lock);
5312a3ed
JG
2036
2037 DBG("Relay quiescent control pending flag set to %" PRIu64, msg.stream_id);
7591bab1
MD
2038 stream_put(stream);
2039reply:
53efb85a 2040 memset(&reply, 0, sizeof(reply));
c8f59ee5 2041 reply.ret_code = htobe32(LTTNG_OK);
5312a3ed
JG
2042 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2043 if (send_ret < (ssize_t) sizeof(reply)) {
2044 ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
2045 send_ret);
2046 ret = -1;
2047 } else {
2048 ret = 0;
c8f59ee5
DG
2049 }
2050
ad7051c0 2051end_no_session:
c8f59ee5
DG
2052 return ret;
2053}
2054
f7079f67 2055/*
7591bab1
MD
2056 * Initialize a data pending command. This means that a consumer is about
2057 * to ask for data pending for each stream it holds. Simply iterate over
2058 * all streams of a session and set the data_pending_check_done flag.
f7079f67
DG
2059 *
2060 * This command returns to the client a LTTNG_OK code.
2061 */
5312a3ed
JG
2062static int relay_begin_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2063 struct relay_connection *conn,
2064 const struct lttng_buffer_view *payload)
f7079f67
DG
2065{
2066 int ret;
5312a3ed 2067 ssize_t send_ret;
f7079f67
DG
2068 struct lttng_ht_iter iter;
2069 struct lttcomm_relayd_begin_data_pending msg;
2070 struct lttcomm_relayd_generic_reply reply;
2071 struct relay_stream *stream;
f7079f67
DG
2072
2073 assert(recv_hdr);
58eb9381 2074 assert(conn);
f7079f67
DG
2075
2076 DBG("Init streams for data pending");
2077
5312a3ed 2078 if (!conn->session || !conn->version_check_done) {
f7079f67
DG
2079 ERR("Trying to check for data before version check");
2080 ret = -1;
2081 goto end_no_session;
2082 }
2083
5312a3ed
JG
2084 if (payload->size < sizeof(msg)) {
2085 ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
2086 sizeof(msg), payload->size);
f7079f67
DG
2087 ret = -1;
2088 goto end_no_session;
2089 }
5312a3ed
JG
2090 memcpy(&msg, payload->data, sizeof(msg));
2091 msg.session_id = be64toh(msg.session_id);
f7079f67
DG
2092
2093 /*
7591bab1
MD
2094 * Iterate over all streams to set the begin data pending flag.
2095 * For now, the streams are indexed by stream handle so we have
2096 * to iterate over all streams to find the one associated with
2097 * the right session_id.
f7079f67
DG
2098 */
2099 rcu_read_lock();
d3e2ba59 2100 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2101 node.node) {
7591bab1
MD
2102 if (!stream_get(stream)) {
2103 continue;
2104 }
5312a3ed 2105 if (stream->trace->session->id == msg.session_id) {
7591bab1
MD
2106 pthread_mutex_lock(&stream->lock);
2107 stream->data_pending_check_done = false;
2108 pthread_mutex_unlock(&stream->lock);
f7079f67
DG
2109 DBG("Set begin data pending flag to stream %" PRIu64,
2110 stream->stream_handle);
2111 }
7591bab1 2112 stream_put(stream);
f7079f67
DG
2113 }
2114 rcu_read_unlock();
2115
53efb85a 2116 memset(&reply, 0, sizeof(reply));
f7079f67
DG
2117 /* All good, send back reply. */
2118 reply.ret_code = htobe32(LTTNG_OK);
2119
5312a3ed
JG
2120 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2121 if (send_ret < (ssize_t) sizeof(reply)) {
2122 ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
2123 send_ret);
2124 ret = -1;
2125 } else {
2126 ret = 0;
f7079f67
DG
2127 }
2128
2129end_no_session:
2130 return ret;
2131}
2132
2133/*
7591bab1
MD
2134 * End data pending command. This will check, for a given session id, if
2135 * each stream associated with it has its data_pending_check_done flag
2136 * set. If not, this means that the client lost track of the stream but
2137 * the data is still being streamed on our side. In this case, we inform
2138 * the client that data is in flight.
f7079f67
DG
2139 *
2140 * Return to the client if there is data in flight or not with a ret_code.
2141 */
5312a3ed
JG
2142static int relay_end_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
2143 struct relay_connection *conn,
2144 const struct lttng_buffer_view *payload)
f7079f67
DG
2145{
2146 int ret;
5312a3ed 2147 ssize_t send_ret;
f7079f67
DG
2148 struct lttng_ht_iter iter;
2149 struct lttcomm_relayd_end_data_pending msg;
2150 struct lttcomm_relayd_generic_reply reply;
2151 struct relay_stream *stream;
f7079f67
DG
2152 uint32_t is_data_inflight = 0;
2153
f7079f67
DG
2154 DBG("End data pending command");
2155
5312a3ed 2156 if (!conn->session || !conn->version_check_done) {
f7079f67
DG
2157 ERR("Trying to check for data before version check");
2158 ret = -1;
2159 goto end_no_session;
2160 }
2161
5312a3ed
JG
2162 if (payload->size < sizeof(msg)) {
2163 ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
2164 sizeof(msg), payload->size);
f7079f67
DG
2165 ret = -1;
2166 goto end_no_session;
2167 }
5312a3ed
JG
2168 memcpy(&msg, payload->data, sizeof(msg));
2169 msg.session_id = be64toh(msg.session_id);
f7079f67 2170
7591bab1
MD
2171 /*
2172 * Iterate over all streams to see if the begin data pending
2173 * flag is set.
2174 */
f7079f67 2175 rcu_read_lock();
d3e2ba59 2176 cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
2a174661 2177 node.node) {
7591bab1
MD
2178 if (!stream_get(stream)) {
2179 continue;
2180 }
5312a3ed 2181 if (stream->trace->session->id != msg.session_id) {
7591bab1
MD
2182 stream_put(stream);
2183 continue;
2184 }
2185 pthread_mutex_lock(&stream->lock);
2186 if (!stream->data_pending_check_done) {
298a25ca
JG
2187 uint64_t stream_seq;
2188
2189 if (session_streams_have_index(conn->session)) {
2190 /*
2191 * Ensure that both the index and stream data have been
2192 * flushed up to the requested point.
2193 */
a8f9f353 2194 stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
298a25ca 2195 } else {
a8f9f353 2196 stream_seq = stream->prev_data_seq;
298a25ca
JG
2197 }
2198 if (!stream->closed || !(((int64_t) (stream_seq - stream->last_net_seq_num)) >= 0)) {
7591bab1
MD
2199 is_data_inflight = 1;
2200 DBG("Data is still in flight for stream %" PRIu64,
2201 stream->stream_handle);
2202 pthread_mutex_unlock(&stream->lock);
2203 stream_put(stream);
2204 break;
2205 }
f7079f67 2206 }
7591bab1
MD
2207 pthread_mutex_unlock(&stream->lock);
2208 stream_put(stream);
f7079f67
DG
2209 }
2210 rcu_read_unlock();
2211
53efb85a 2212 memset(&reply, 0, sizeof(reply));
f7079f67
DG
2213 /* All good, send back reply. */
2214 reply.ret_code = htobe32(is_data_inflight);
2215
5312a3ed
JG
2216 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
2217 if (send_ret < (ssize_t) sizeof(reply)) {
2218 ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
2219 send_ret);
2220 ret = -1;
2221 } else {
2222 ret = 0;
f7079f67
DG
2223 }
2224
2225end_no_session:
2226 return ret;
2227}
2228
1c20f0e2
JD
2229/*
2230 * Receive an index for a specific stream.
2231 *
2232 * Return 0 on success else a negative value.
2233 */
5312a3ed
JG
2234static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
2235 struct relay_connection *conn,
2236 const struct lttng_buffer_view *payload)
1c20f0e2 2237{
5312a3ed
JG
2238 int ret;
2239 ssize_t send_ret;
58eb9381 2240 struct relay_session *session = conn->session;
1c20f0e2 2241 struct lttcomm_relayd_index index_info;
1c20f0e2
JD
2242 struct lttcomm_relayd_generic_reply reply;
2243 struct relay_stream *stream;
f8f3885c 2244 size_t msg_len;
1c20f0e2 2245
58eb9381 2246 assert(conn);
1c20f0e2
JD
2247
2248 DBG("Relay receiving index");
2249
5312a3ed 2250 if (!session || !conn->version_check_done) {
1c20f0e2
JD
2251 ERR("Trying to close a stream before version check");
2252 ret = -1;
2253 goto end_no_session;
2254 }
2255
f8f3885c
MD
2256 msg_len = lttcomm_relayd_index_len(
2257 lttng_to_index_major(conn->major, conn->minor),
2258 lttng_to_index_minor(conn->major, conn->minor));
5312a3ed
JG
2259 if (payload->size < msg_len) {
2260 ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
2261 msg_len, payload->size);
1c20f0e2
JD
2262 ret = -1;
2263 goto end_no_session;
2264 }
5312a3ed
JG
2265 memcpy(&index_info, payload->data, msg_len);
2266 index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
2267 index_info.net_seq_num = be64toh(index_info.net_seq_num);
2268 index_info.packet_size = be64toh(index_info.packet_size);
2269 index_info.content_size = be64toh(index_info.content_size);
2270 index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
2271 index_info.timestamp_end = be64toh(index_info.timestamp_end);
2272 index_info.events_discarded = be64toh(index_info.events_discarded);
2273 index_info.stream_id = be64toh(index_info.stream_id);
81df238b
JR
2274
2275 if (conn->minor >= 8) {
2276 index_info.stream_instance_id =
2277 be64toh(index_info.stream_instance_id);
2278 index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
0f83d1cc
MD
2279 } else {
2280 index_info.stream_instance_id = -1ULL;
2281 index_info.packet_seq_num = -1ULL;
81df238b 2282 }
5312a3ed
JG
2283
2284 stream = stream_get_by_id(index_info.relay_stream_id);
1c20f0e2 2285 if (!stream) {
7591bab1 2286 ERR("stream_get_by_id not found");
1c20f0e2 2287 ret = -1;
7591bab1 2288 goto end;
1c20f0e2 2289 }
d3e2ba59 2290
c35f9726
JG
2291 pthread_mutex_lock(&stream->lock);
2292 ret = stream_add_index(stream, &index_info);
2293 pthread_mutex_unlock(&stream->lock);
2294 if (ret) {
7591bab1
MD
2295 goto end_stream_put;
2296 }
1c20f0e2 2297
7591bab1 2298end_stream_put:
7591bab1 2299 stream_put(stream);
7591bab1 2300end:
53efb85a 2301 memset(&reply, 0, sizeof(reply));
1c20f0e2
JD
2302 if (ret < 0) {
2303 reply.ret_code = htobe32(LTTNG_ERR_UNK);
2304 } else {
2305 reply.ret_code = htobe32(LTTNG_OK);
2306 }
58eb9381 2307 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
2308 if (send_ret < (ssize_t) sizeof(reply)) {
2309 ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
2310 ret = -1;
1c20f0e2
JD
2311 }
2312
2313end_no_session:
2314 return ret;
2315}
2316
a4baae1b
JD
2317/*
2318 * Receive the streams_sent message.
2319 *
2320 * Return 0 on success else a negative value.
2321 */
5312a3ed
JG
2322static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
2323 struct relay_connection *conn,
2324 const struct lttng_buffer_view *payload)
a4baae1b 2325{
5312a3ed
JG
2326 int ret;
2327 ssize_t send_ret;
a4baae1b
JD
2328 struct lttcomm_relayd_generic_reply reply;
2329
58eb9381 2330 assert(conn);
a4baae1b
JD
2331
2332 DBG("Relay receiving streams_sent");
2333
5312a3ed 2334 if (!conn->session || !conn->version_check_done) {
a4baae1b
JD
2335 ERR("Trying to close a stream before version check");
2336 ret = -1;
2337 goto end_no_session;
2338 }
2339
2340 /*
7591bab1
MD
2341 * Publish every pending stream in the connection recv list which are
2342 * now ready to be used by the viewer.
4a9daf17 2343 */
7591bab1 2344 publish_connection_local_streams(conn);
4a9daf17 2345
53efb85a 2346 memset(&reply, 0, sizeof(reply));
a4baae1b 2347 reply.ret_code = htobe32(LTTNG_OK);
58eb9381 2348 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
5312a3ed
JG
2349 if (send_ret < (ssize_t) sizeof(reply)) {
2350 ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
2351 send_ret);
2352 ret = -1;
a4baae1b
JD
2353 } else {
2354 /* Success. */
2355 ret = 0;
2356 }
2357
2358end_no_session:
2359 return ret;
2360}
2361
d3ecc550 2362/*
c35f9726
JG
2363 * relay_rotate_session_stream: rotate a stream to a new tracefile for the
2364 * session rotation feature (not the tracefile rotation feature).
d3ecc550 2365 */
c35f9726
JG
2366static int relay_rotate_session_streams(
2367 const struct lttcomm_relayd_hdr *recv_hdr,
5312a3ed
JG
2368 struct relay_connection *conn,
2369 const struct lttng_buffer_view *payload)
d3ecc550 2370{
30b9d5ab 2371 int ret = 0;
c35f9726 2372 uint32_t i;
5312a3ed 2373 ssize_t send_ret;
c35f9726 2374 enum lttng_error_code reply_code = LTTNG_ERR_UNK;
d3ecc550 2375 struct relay_session *session = conn->session;
c35f9726
JG
2376 struct lttcomm_relayd_rotate_streams rotate_streams;
2377 struct lttcomm_relayd_generic_reply reply = {};
2378 struct relay_stream *stream = NULL;
2379 const size_t header_len = sizeof(struct lttcomm_relayd_rotate_streams);
2380 struct lttng_trace_chunk *next_trace_chunk = NULL;
2381 struct lttng_buffer_view stream_positions;
70626904
JG
2382 char chunk_id_buf[MAX_INT_DEC_LEN(uint64_t)];
2383 const char *chunk_id_str = "none";
d3ecc550 2384
d3ecc550
JD
2385 if (!session || !conn->version_check_done) {
2386 ERR("Trying to rotate a stream before version check");
2387 ret = -1;
2388 goto end_no_reply;
2389 }
2390
2391 if (session->major == 2 && session->minor < 11) {
2392 ERR("Unsupported feature before 2.11");
2393 ret = -1;
2394 goto end_no_reply;
2395 }
2396
5312a3ed
JG
2397 if (payload->size < header_len) {
2398 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
2399 header_len, payload->size);
d3ecc550
JD
2400 ret = -1;
2401 goto end_no_reply;
2402 }
2403
c35f9726 2404 memcpy(&rotate_streams, payload->data, header_len);
5312a3ed 2405
c35f9726
JG
2406 /* Convert header to host endianness. */
2407 rotate_streams = (typeof(rotate_streams)) {
2408 .stream_count = be32toh(rotate_streams.stream_count),
2409 .new_chunk_id = (typeof(rotate_streams.new_chunk_id)) {
2410 .is_set = !!rotate_streams.new_chunk_id.is_set,
2411 .value = be64toh(rotate_streams.new_chunk_id.value),
2412 }
2413 };
d3ecc550 2414
c35f9726
JG
2415 if (rotate_streams.new_chunk_id.is_set) {
2416 /*
2417 * Retrieve the trace chunk the stream must transition to. As
2418 * per the protocol, this chunk should have been created
2419 * before this command is received.
2420 */
2421 next_trace_chunk = sessiond_trace_chunk_registry_get_chunk(
2422 sessiond_trace_chunk_registry,
2423 session->sessiond_uuid, session->id,
2424 rotate_streams.new_chunk_id.value);
2425 if (!next_trace_chunk) {
c70636a7 2426 char uuid_str[LTTNG_UUID_STR_LEN];
c35f9726
JG
2427
2428 lttng_uuid_to_str(session->sessiond_uuid, uuid_str);
2429 ERR("Unknown next trace chunk in ROTATE_STREAMS command: sessiond_uuid = {%s}, session_id = %" PRIu64
2430 ", trace_chunk_id = %" PRIu64,
2431 uuid_str, session->id,
2432 rotate_streams.new_chunk_id.value);
2433 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2434 ret = -1;
2435 goto end;
2436 }
70626904
JG
2437
2438 ret = snprintf(chunk_id_buf, sizeof(chunk_id_buf), "%" PRIu64,
2439 rotate_streams.new_chunk_id.value);
2440 if (ret < 0 || ret >= sizeof(chunk_id_buf)) {
2441 chunk_id_str = "formatting error";
2442 } else {
2443 chunk_id_str = chunk_id_buf;
2444 }
d3ecc550
JD
2445 }
2446
70626904
JG
2447 DBG("Rotate %" PRIu32 " streams of session \"%s\" to chunk \"%s\"",
2448 rotate_streams.stream_count, session->session_name,
2449 chunk_id_str);
2450
c35f9726
JG
2451 stream_positions = lttng_buffer_view_from_view(payload,
2452 sizeof(rotate_streams), -1);
2453 if (!stream_positions.data ||
2454 stream_positions.size <
2455 (rotate_streams.stream_count *
2456 sizeof(struct lttcomm_relayd_stream_rotation_position))) {
2457 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
d3ecc550 2458 ret = -1;
5312a3ed 2459 goto end;
d3ecc550
JD
2460 }
2461
c35f9726
JG
2462 for (i = 0; i < rotate_streams.stream_count; i++) {
2463 struct lttcomm_relayd_stream_rotation_position *position_comm =
2464 &((typeof(position_comm)) stream_positions.data)[i];
2465 const struct lttcomm_relayd_stream_rotation_position pos = {
2466 .stream_id = be64toh(position_comm->stream_id),
2467 .rotate_at_seq_num = be64toh(
2468 position_comm->rotate_at_seq_num),
2469 };
5312a3ed 2470
c35f9726
JG
2471 stream = stream_get_by_id(pos.stream_id);
2472 if (!stream) {
2473 reply_code = LTTNG_ERR_INVALID;
2474 ret = -1;
2475 goto end;
c6db3843
JG
2476 }
2477
c35f9726
JG
2478 pthread_mutex_lock(&stream->lock);
2479 ret = stream_set_pending_rotation(stream, next_trace_chunk,
2480 pos.rotate_at_seq_num);
2481 pthread_mutex_unlock(&stream->lock);
2482 if (ret) {
2483 reply_code = LTTNG_ERR_FILE_CREATION_ERROR;
2484 goto end;
c6db3843 2485 }
c35f9726
JG
2486
2487 stream_put(stream);
2488 stream = NULL;
d3ecc550
JD
2489 }
2490
c35f9726 2491 reply_code = LTTNG_OK;
eaeb64a9 2492 ret = 0;
d3ecc550 2493end:
c35f9726
JG
2494 if (stream) {
2495 stream_put(stream);
d3ecc550 2496 }
c35f9726
JG
2497
2498 reply.ret_code = htobe32((uint32_t) reply_code);
d3ecc550
JD
2499 send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
2500 sizeof(struct lttcomm_relayd_generic_reply), 0);
5312a3ed
JG
2501 if (send_ret < (ssize_t) sizeof(reply)) {
2502 ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
2503 send_ret);
2504 ret = -1;
d3ecc550 2505 }
d3ecc550 2506end_no_reply:
c35f9726 2507 lttng_trace_chunk_put(next_trace_chunk);
d3ecc550
JD
2508 return ret;
2509}
2510
e5add6d0 2511
e5add6d0
JG
2512
2513/*
2514 * relay_create_trace_chunk: create a new trace chunk
2515 */
2516static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
2517 struct relay_connection *conn,
2518 const struct lttng_buffer_view *payload)
2519{
2520 int ret = 0;
2521 ssize_t send_ret;
2522 struct relay_session *session = conn->session;
2523 struct lttcomm_relayd_create_trace_chunk *msg;
2524 struct lttcomm_relayd_generic_reply reply = {};
2525 struct lttng_buffer_view header_view;
2526 struct lttng_buffer_view chunk_name_view;
2527 struct lttng_trace_chunk *chunk = NULL, *published_chunk = NULL;
2528 enum lttng_error_code reply_code = LTTNG_OK;
2529 enum lttng_trace_chunk_status chunk_status;
cbf53d23 2530 struct lttng_directory_handle *session_output = NULL;
a7ceb342 2531 const char *new_path;
e5add6d0
JG
2532
2533 if (!session || !conn->version_check_done) {
2534 ERR("Trying to create a trace chunk before version check");
2535 ret = -1;
2536 goto end_no_reply;
2537 }
2538
2539 if (session->major == 2 && session->minor < 11) {
2540 ERR("Chunk creation command is unsupported before 2.11");
2541 ret = -1;
2542 goto end_no_reply;
2543 }
2544
2545 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2546 if (!header_view.data) {
2547 ERR("Failed to receive payload of chunk creation command");
2548 ret = -1;
2549 goto end_no_reply;
2550 }
2551
2552 /* Convert to host endianness. */
2553 msg = (typeof(msg)) header_view.data;
2554 msg->chunk_id = be64toh(msg->chunk_id);
2555 msg->creation_timestamp = be64toh(msg->creation_timestamp);
2556 msg->override_name_length = be32toh(msg->override_name_length);
2557
a7ceb342
MD
2558 if (session->current_trace_chunk &&
2559 !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
2560 chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
2561 DEFAULT_CHUNK_TMP_OLD_DIRECTORY);
2562 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2563 ERR("Failed to rename old chunk");
2564 ret = -1;
2565 reply_code = LTTNG_ERR_UNK;
2566 goto end;
2567 }
2568 }
2569 session->ongoing_rotation = true;
2570 if (!session->current_trace_chunk) {
2571 if (!session->has_rotated) {
2572 new_path = "";
2573 } else {
2574 new_path = NULL;
2575 }
2576 } else {
2577 new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY;
2578 }
e5add6d0 2579 chunk = lttng_trace_chunk_create(
a7ceb342 2580 msg->chunk_id, msg->creation_timestamp, new_path);
e5add6d0
JG
2581 if (!chunk) {
2582 ERR("Failed to create trace chunk in trace chunk creation command");
2583 ret = -1;
2584 reply_code = LTTNG_ERR_NOMEM;
2585 goto end;
2586 }
2587
2588 if (msg->override_name_length) {
2589 const char *name;
2590
2591 chunk_name_view = lttng_buffer_view_from_view(payload,
2592 sizeof(*msg),
2593 msg->override_name_length);
2594 name = chunk_name_view.data;
2595 if (!name || name[msg->override_name_length - 1]) {
2596 ERR("Failed to receive payload of chunk creation command");
2597 ret = -1;
2598 reply_code = LTTNG_ERR_INVALID;
2599 goto end;
2600 }
2601
2602 chunk_status = lttng_trace_chunk_override_name(
2603 chunk, chunk_name_view.data);
2604 switch (chunk_status) {
2605 case LTTNG_TRACE_CHUNK_STATUS_OK:
2606 break;
2607 case LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT:
2608 ERR("Failed to set the name of new trace chunk in trace chunk creation command (invalid name)");
2609 reply_code = LTTNG_ERR_INVALID;
2610 ret = -1;
2611 goto end;
2612 default:
2613 ERR("Failed to set the name of new trace chunk in trace chunk creation command (unknown error)");
2614 reply_code = LTTNG_ERR_UNK;
2615 ret = -1;
2616 goto end;
2617 }
2618 }
2619
e5add6d0
JG
2620 chunk_status = lttng_trace_chunk_set_credentials_current_user(chunk);
2621 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2622 reply_code = LTTNG_ERR_UNK;
2623 ret = -1;
2624 goto end;
2625 }
2626
cbf53d23
JG
2627 session_output = session_create_output_directory_handle(
2628 conn->session);
2629 if (!session_output) {
0ccc0411
JG
2630 reply_code = LTTNG_ERR_CREATE_DIR_FAIL;
2631 goto end;
2632 }
cbf53d23
JG
2633 chunk_status = lttng_trace_chunk_set_as_owner(chunk, session_output);
2634 lttng_directory_handle_put(session_output);
2635 session_output = NULL;
e5add6d0
JG
2636 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2637 reply_code = LTTNG_ERR_UNK;
2638 ret = -1;
2639 goto end;
2640 }
2641
2642 published_chunk = sessiond_trace_chunk_registry_publish_chunk(
2643 sessiond_trace_chunk_registry,
2644 conn->session->sessiond_uuid,
2645 conn->session->id,
2646 chunk);
2647 if (!published_chunk) {
c70636a7 2648 char uuid_str[LTTNG_UUID_STR_LEN];
e5add6d0
JG
2649
2650 lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
2651 ERR("Failed to publish chunk: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
2652 uuid_str,
2653 conn->session->id,
2654 msg->chunk_id);
2655 ret = -1;
2656 reply_code = LTTNG_ERR_NOMEM;
2657 goto end;
2658 }
2659
2660 pthread_mutex_lock(&conn->session->lock);
62bad3bf
JG
2661 if (conn->session->pending_closure_trace_chunk) {
2662 /*
2663 * Invalid; this means a second create_trace_chunk command was
2664 * received before a close_trace_chunk.
2665 */
2666 ERR("Invalid trace chunk close command received; a trace chunk is already waiting for a trace chunk close command");
2667 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2668 ret = -1;
2669 goto end_unlock_session;
2670 }
2671 conn->session->pending_closure_trace_chunk =
2672 conn->session->current_trace_chunk;
e5add6d0 2673 conn->session->current_trace_chunk = published_chunk;
e5add6d0 2674 published_chunk = NULL;
a7ceb342
MD
2675 if (!conn->session->pending_closure_trace_chunk) {
2676 session->ongoing_rotation = false;
2677 }
62bad3bf 2678end_unlock_session:
c35f9726 2679 pthread_mutex_unlock(&conn->session->lock);
e5add6d0
JG
2680end:
2681 reply.ret_code = htobe32((uint32_t) reply_code);
2682 send_ret = conn->sock->ops->sendmsg(conn->sock,
2683 &reply,
2684 sizeof(struct lttcomm_relayd_generic_reply),
2685 0);
2686 if (send_ret < (ssize_t) sizeof(reply)) {
2687 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
2688 send_ret);
2689 ret = -1;
2690 }
2691end_no_reply:
2692 lttng_trace_chunk_put(chunk);
2693 lttng_trace_chunk_put(published_chunk);
cbf53d23 2694 lttng_directory_handle_put(session_output);
e5add6d0
JG
2695 return ret;
2696}
2697
bbc4768c
JG
2698/*
2699 * relay_close_trace_chunk: close a trace chunk
2700 */
2701static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
2702 struct relay_connection *conn,
2703 const struct lttng_buffer_view *payload)
2704{
9898f786 2705 int ret = 0, buf_ret;
bbc4768c
JG
2706 ssize_t send_ret;
2707 struct relay_session *session = conn->session;
2708 struct lttcomm_relayd_close_trace_chunk *msg;
ecd1a12f 2709 struct lttcomm_relayd_close_trace_chunk_reply reply = {};
bbc4768c
JG
2710 struct lttng_buffer_view header_view;
2711 struct lttng_trace_chunk *chunk = NULL;
2712 enum lttng_error_code reply_code = LTTNG_OK;
2713 enum lttng_trace_chunk_status chunk_status;
2714 uint64_t chunk_id;
c35f9726 2715 LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command = {};
bbc4768c 2716 time_t close_timestamp;
ecd1a12f
MD
2717 char closed_trace_chunk_path[LTTNG_PATH_MAX];
2718 size_t path_length = 0;
2719 const char *chunk_name = NULL;
2720 struct lttng_dynamic_buffer reply_payload;
a7ceb342 2721 const char *new_path;
ecd1a12f
MD
2722
2723 lttng_dynamic_buffer_init(&reply_payload);
bbc4768c
JG
2724
2725 if (!session || !conn->version_check_done) {
2726 ERR("Trying to close a trace chunk before version check");
2727 ret = -1;
2728 goto end_no_reply;
2729 }
2730
2731 if (session->major == 2 && session->minor < 11) {
2732 ERR("Chunk close command is unsupported before 2.11");
2733 ret = -1;
2734 goto end_no_reply;
2735 }
2736
2737 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2738 if (!header_view.data) {
2739 ERR("Failed to receive payload of chunk close command");
2740 ret = -1;
2741 goto end_no_reply;
2742 }
2743
2744 /* Convert to host endianness. */
2745 msg = (typeof(msg)) header_view.data;
2746 chunk_id = be64toh(msg->chunk_id);
2747 close_timestamp = (time_t) be64toh(msg->close_timestamp);
2748 close_command = (typeof(close_command)){
2749 .value = be32toh(msg->close_command.value),
2750 .is_set = msg->close_command.is_set,
2751 };
2752
2753 chunk = sessiond_trace_chunk_registry_get_chunk(
2754 sessiond_trace_chunk_registry,
2755 conn->session->sessiond_uuid,
2756 conn->session->id,
2757 chunk_id);
2758 if (!chunk) {
c70636a7 2759 char uuid_str[LTTNG_UUID_STR_LEN];
bbc4768c
JG
2760
2761 lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
2762 ERR("Failed to find chunk to close: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
2763 uuid_str,
2764 conn->session->id,
2765 msg->chunk_id);
2766 ret = -1;
2767 reply_code = LTTNG_ERR_NOMEM;
2768 goto end;
2769 }
2770
62bad3bf 2771 pthread_mutex_lock(&session->lock);
f77a6ec2
MD
2772 if (close_command.is_set &&
2773 close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE) {
2774 /*
2775 * Clear command. It is a protocol error to ask for a
2776 * clear on a relay which does not allow it. Querying
2777 * the configuration allows figuring out whether
2778 * clearing is allowed before doing the clear.
2779 */
2780 if (!opt_allow_clear) {
2781 ret = -1;
2782 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2783 goto end_unlock_session;
2784 }
2785 }
62bad3bf
JG
2786 if (session->pending_closure_trace_chunk &&
2787 session->pending_closure_trace_chunk != chunk) {
2788 ERR("Trace chunk close command for session \"%s\" does not target the trace chunk pending closure",
2789 session->session_name);
2790 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2791 ret = -1;
2792 goto end_unlock_session;
2793 }
2794
a7ceb342
MD
2795 if (session->current_trace_chunk && session->current_trace_chunk != chunk &&
2796 !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
2797 if (close_command.is_set &&
2798 close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE &&
2799 !session->has_rotated) {
2800 /* New chunk stays in session output directory. */
2801 new_path = "";
2802 } else {
2803 /* Use chunk name for new chunk. */
2804 new_path = NULL;
2805 }
2806 /* Rename new chunk path. */
2807 chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
2808 new_path);
2809 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2810 ret = -1;
2811 goto end;
2812 }
2813 session->ongoing_rotation = false;
2814 }
2815 if ((!close_command.is_set ||
2816 close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) &&
2817 !lttng_trace_chunk_get_name_overridden(chunk)) {
2818 const char *old_path;
2819
2820 if (!session->has_rotated) {
2821 old_path = "";
2822 } else {
2823 old_path = NULL;
2824 }
2825 /* We need to move back the .tmp_old_chunk to its rightful place. */
2826 chunk_status = lttng_trace_chunk_rename_path(chunk, old_path);
2827 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2828 ret = -1;
2829 goto end;
2830 }
2831 }
bbc4768c
JG
2832 chunk_status = lttng_trace_chunk_set_close_timestamp(
2833 chunk, close_timestamp);
2834 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2835 ERR("Failed to set trace chunk close timestamp");
2836 ret = -1;
2837 reply_code = LTTNG_ERR_UNK;
62bad3bf 2838 goto end_unlock_session;
bbc4768c
JG
2839 }
2840
2841 if (close_command.is_set) {
2842 chunk_status = lttng_trace_chunk_set_close_command(
2843 chunk, close_command.value);
2844 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2845 ret = -1;
2846 reply_code = LTTNG_ERR_INVALID;
62bad3bf 2847 goto end_unlock_session;
bbc4768c
JG
2848 }
2849 }
ecd1a12f
MD
2850 chunk_status = lttng_trace_chunk_get_name(chunk, &chunk_name, NULL);
2851 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
2852 ERR("Failed to get chunk name");
2853 ret = -1;
2854 reply_code = LTTNG_ERR_UNK;
2855 goto end_unlock_session;
2856 }
2857 if (!session->has_rotated && !session->snapshot) {
2858 ret = lttng_strncpy(closed_trace_chunk_path,
2859 session->output_path,
2860 sizeof(closed_trace_chunk_path));
2861 if (ret) {
2862 ERR("Failed to send trace chunk path: path length of %zu bytes exceeds the maximal allowed length of %zu bytes",
2863 strlen(session->output_path),
2864 sizeof(closed_trace_chunk_path));
2865 reply_code = LTTNG_ERR_NOMEM;
2866 ret = -1;
2867 goto end_unlock_session;
2868 }
2869 } else {
2870 if (session->snapshot) {
2871 ret = snprintf(closed_trace_chunk_path,
2872 sizeof(closed_trace_chunk_path),
2873 "%s/%s", session->output_path,
2874 chunk_name);
2875 } else {
2876 ret = snprintf(closed_trace_chunk_path,
2877 sizeof(closed_trace_chunk_path),
2878 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
2879 "/%s",
2880 session->output_path, chunk_name);
2881 }
2882 if (ret < 0 || ret == sizeof(closed_trace_chunk_path)) {
2883 ERR("Failed to format closed trace chunk resulting path");
2884 reply_code = ret < 0 ? LTTNG_ERR_UNK : LTTNG_ERR_NOMEM;
2885 ret = -1;
2886 goto end_unlock_session;
2887 }
2888 }
489ea154
MD
2889 if (close_command.is_set &&
2890 close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) {
2891 session->has_rotated = true;
2892 }
ecd1a12f
MD
2893 DBG("Reply chunk path on close: %s", closed_trace_chunk_path);
2894 path_length = strlen(closed_trace_chunk_path) + 1;
2895 if (path_length > UINT32_MAX) {
2896 ERR("Closed trace chunk path exceeds the maximal length allowed by the protocol");
2897 ret = -1;
2898 reply_code = LTTNG_ERR_INVALID_PROTOCOL;
2899 goto end_unlock_session;
2900 }
bbc4768c 2901
c35f9726
JG
2902 if (session->current_trace_chunk == chunk) {
2903 /*
2904 * After a trace chunk close command, no new streams
2905 * referencing the chunk may be created. Hence, on the
2906 * event that no new trace chunk have been created for
2907 * the session, the reference to the current trace chunk
2908 * is released in order to allow it to be reclaimed when
2909 * the last stream releases its reference to it.
2910 */
2911 lttng_trace_chunk_put(session->current_trace_chunk);
2912 session->current_trace_chunk = NULL;
2913 }
62bad3bf
JG
2914 lttng_trace_chunk_put(session->pending_closure_trace_chunk);
2915 session->pending_closure_trace_chunk = NULL;
2916end_unlock_session:
c35f9726
JG
2917 pthread_mutex_unlock(&session->lock);
2918
bbc4768c 2919end:
ecd1a12f
MD
2920 reply.generic.ret_code = htobe32((uint32_t) reply_code);
2921 reply.path_length = htobe32((uint32_t) path_length);
9898f786 2922 buf_ret = lttng_dynamic_buffer_append(
ecd1a12f 2923 &reply_payload, &reply, sizeof(reply));
9898f786 2924 if (buf_ret) {
ecd1a12f
MD
2925 ERR("Failed to append \"close trace chunk\" command reply header to payload buffer");
2926 goto end_no_reply;
2927 }
2928
2929 if (reply_code == LTTNG_OK) {
9898f786 2930 buf_ret = lttng_dynamic_buffer_append(&reply_payload,
ecd1a12f 2931 closed_trace_chunk_path, path_length);
9898f786 2932 if (buf_ret) {
ecd1a12f
MD
2933 ERR("Failed to append \"close trace chunk\" command reply path to payload buffer");
2934 goto end_no_reply;
2935 }
2936 }
2937
bbc4768c 2938 send_ret = conn->sock->ops->sendmsg(conn->sock,
ecd1a12f
MD
2939 reply_payload.data,
2940 reply_payload.size,
bbc4768c 2941 0);
ecd1a12f
MD
2942 if (send_ret < reply_payload.size) {
2943 ERR("Failed to send \"close trace chunk\" command reply of %zu bytes (ret = %zd)",
2944 reply_payload.size, send_ret);
bbc4768c 2945 ret = -1;
ecd1a12f 2946 goto end_no_reply;
bbc4768c
JG
2947 }
2948end_no_reply:
2949 lttng_trace_chunk_put(chunk);
ecd1a12f 2950 lttng_dynamic_buffer_reset(&reply_payload);
bbc4768c
JG
2951 return ret;
2952}
2953
c35f9726
JG
2954/*
2955 * relay_trace_chunk_exists: check if a trace chunk exists
2956 */
2957static int relay_trace_chunk_exists(const struct lttcomm_relayd_hdr *recv_hdr,
2958 struct relay_connection *conn,
2959 const struct lttng_buffer_view *payload)
2960{
2961 int ret = 0;
2962 ssize_t send_ret;
2963 struct relay_session *session = conn->session;
2964 struct lttcomm_relayd_trace_chunk_exists *msg;
2965 struct lttcomm_relayd_trace_chunk_exists_reply reply = {};
2966 struct lttng_buffer_view header_view;
c35f9726 2967 uint64_t chunk_id;
6b584c2e 2968 bool chunk_exists;
c35f9726
JG
2969
2970 if (!session || !conn->version_check_done) {
2971 ERR("Trying to close a trace chunk before version check");
2972 ret = -1;
2973 goto end_no_reply;
2974 }
2975
2976 if (session->major == 2 && session->minor < 11) {
2977 ERR("Chunk close command is unsupported before 2.11");
2978 ret = -1;
2979 goto end_no_reply;
2980 }
2981
2982 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
2983 if (!header_view.data) {
2984 ERR("Failed to receive payload of chunk close command");
2985 ret = -1;
2986 goto end_no_reply;
2987 }
2988
2989 /* Convert to host endianness. */
2990 msg = (typeof(msg)) header_view.data;
2991 chunk_id = be64toh(msg->chunk_id);
2992
6b584c2e 2993 ret = sessiond_trace_chunk_registry_chunk_exists(
c35f9726
JG
2994 sessiond_trace_chunk_registry,
2995 conn->session->sessiond_uuid,
2996 conn->session->id,
6b584c2e
JG
2997 chunk_id, &chunk_exists);
2998 /*
2999 * If ret is not 0, send the reply and report the error to the caller.
3000 * It is a protocol (or internal) error and the session/connection
3001 * should be torn down.
3002 */
3003 reply = (typeof(reply)){
3004 .generic.ret_code = htobe32((uint32_t)
3005 (ret == 0 ? LTTNG_OK : LTTNG_ERR_INVALID_PROTOCOL)),
3006 .trace_chunk_exists = ret == 0 ? chunk_exists : 0,
c35f9726 3007 };
6b584c2e
JG
3008 send_ret = conn->sock->ops->sendmsg(
3009 conn->sock, &reply, sizeof(reply), 0);
c35f9726
JG
3010 if (send_ret < (ssize_t) sizeof(reply)) {
3011 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
3012 send_ret);
3013 ret = -1;
3014 }
3015end_no_reply:
c35f9726
JG
3016 return ret;
3017}
3018
8614e600
MD
3019/*
3020 * relay_get_configuration: query whether feature is available
3021 */
3022static int relay_get_configuration(const struct lttcomm_relayd_hdr *recv_hdr,
3023 struct relay_connection *conn,
3024 const struct lttng_buffer_view *payload)
3025{
3026 int ret = 0;
3027 ssize_t send_ret;
3028 struct lttcomm_relayd_get_configuration *msg;
3029 struct lttcomm_relayd_get_configuration_reply reply = {};
3030 struct lttng_buffer_view header_view;
3031 uint64_t query_flags = 0;
3032 uint64_t result_flags = 0;
3033
3034 header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
3035 if (!header_view.data) {
3036 ERR("Failed to receive payload of chunk close command");
3037 ret = -1;
3038 goto end_no_reply;
3039 }
3040
3041 /* Convert to host endianness. */
3042 msg = (typeof(msg)) header_view.data;
3043 query_flags = be64toh(msg->query_flags);
3044
3045 if (query_flags) {
3046 ret = LTTNG_ERR_INVALID_PROTOCOL;
3047 goto reply;
3048 }
3049 if (opt_allow_clear) {
3050 result_flags |= LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED;
3051 }
3052 ret = 0;
3053reply:
3054 reply = (typeof(reply)){
3055 .generic.ret_code = htobe32((uint32_t)
3056 (ret == 0 ? LTTNG_OK : LTTNG_ERR_INVALID_PROTOCOL)),
3057 .relayd_configuration_flags = htobe64(result_flags),
3058 };
3059 send_ret = conn->sock->ops->sendmsg(
3060 conn->sock, &reply, sizeof(reply), 0);
3061 if (send_ret < (ssize_t) sizeof(reply)) {
3062 ERR("Failed to send \"get configuration\" command reply (ret = %zd)",
3063 send_ret);
3064 ret = -1;
3065 }
3066end_no_reply:
3067 return ret;
3068}
3069
5312a3ed
JG
3070#define DBG_CMD(cmd_name, conn) \
3071 DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
3072
3073static int relay_process_control_command(struct relay_connection *conn,
3074 const struct lttcomm_relayd_hdr *header,
3075 const struct lttng_buffer_view *payload)
b8aa1682
JD
3076{
3077 int ret = 0;
3078
5312a3ed 3079 switch (header->cmd) {
b8aa1682 3080 case RELAYD_CREATE_SESSION:
5312a3ed
JG
3081 DBG_CMD("RELAYD_CREATE_SESSION", conn);
3082 ret = relay_create_session(header, conn, payload);
b8aa1682 3083 break;
b8aa1682 3084 case RELAYD_ADD_STREAM:
5312a3ed
JG
3085 DBG_CMD("RELAYD_ADD_STREAM", conn);
3086 ret = relay_add_stream(header, conn, payload);
b8aa1682
JD
3087 break;
3088 case RELAYD_START_DATA:
5312a3ed
JG
3089 DBG_CMD("RELAYD_START_DATA", conn);
3090 ret = relay_start(header, conn, payload);
b8aa1682
JD
3091 break;
3092 case RELAYD_SEND_METADATA:
5312a3ed
JG
3093 DBG_CMD("RELAYD_SEND_METADATA", conn);
3094 ret = relay_recv_metadata(header, conn, payload);
b8aa1682
JD
3095 break;
3096 case RELAYD_VERSION:
5312a3ed
JG
3097 DBG_CMD("RELAYD_VERSION", conn);
3098 ret = relay_send_version(header, conn, payload);
b8aa1682 3099 break;
173af62f 3100 case RELAYD_CLOSE_STREAM:
5312a3ed
JG
3101 DBG_CMD("RELAYD_CLOSE_STREAM", conn);
3102 ret = relay_close_stream(header, conn, payload);
173af62f 3103 break;
6d805429 3104 case RELAYD_DATA_PENDING:
5312a3ed
JG
3105 DBG_CMD("RELAYD_DATA_PENDING", conn);
3106 ret = relay_data_pending(header, conn, payload);
c8f59ee5
DG
3107 break;
3108 case RELAYD_QUIESCENT_CONTROL:
5312a3ed
JG
3109 DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
3110 ret = relay_quiescent_control(header, conn, payload);
c8f59ee5 3111 break;
f7079f67 3112 case RELAYD_BEGIN_DATA_PENDING:
5312a3ed
JG
3113 DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
3114 ret = relay_begin_data_pending(header, conn, payload);
f7079f67
DG
3115 break;
3116 case RELAYD_END_DATA_PENDING:
5312a3ed
JG
3117 DBG_CMD("RELAYD_END_DATA_PENDING", conn);
3118 ret = relay_end_data_pending(header, conn, payload);
f7079f67 3119 break;
1c20f0e2 3120 case RELAYD_SEND_INDEX:
5312a3ed
JG
3121 DBG_CMD("RELAYD_SEND_INDEX", conn);
3122 ret = relay_recv_index(header, conn, payload);
1c20f0e2 3123 break;
a4baae1b 3124 case RELAYD_STREAMS_SENT:
5312a3ed
JG
3125 DBG_CMD("RELAYD_STREAMS_SENT", conn);
3126 ret = relay_streams_sent(header, conn, payload);
a4baae1b 3127 break;
93ec662e 3128 case RELAYD_RESET_METADATA:
5312a3ed
JG
3129 DBG_CMD("RELAYD_RESET_METADATA", conn);
3130 ret = relay_reset_metadata(header, conn, payload);
93ec662e 3131 break;
c35f9726
JG
3132 case RELAYD_ROTATE_STREAMS:
3133 DBG_CMD("RELAYD_ROTATE_STREAMS", conn);
3134 ret = relay_rotate_session_streams(header, conn, payload);
d3ecc550 3135 break;
e5add6d0
JG
3136 case RELAYD_CREATE_TRACE_CHUNK:
3137 DBG_CMD("RELAYD_CREATE_TRACE_CHUNK", conn);
3138 ret = relay_create_trace_chunk(header, conn, payload);
3139 break;
bbc4768c
JG
3140 case RELAYD_CLOSE_TRACE_CHUNK:
3141 DBG_CMD("RELAYD_CLOSE_TRACE_CHUNK", conn);
3142 ret = relay_close_trace_chunk(header, conn, payload);
3143 break;
c35f9726
JG
3144 case RELAYD_TRACE_CHUNK_EXISTS:
3145 DBG_CMD("RELAYD_TRACE_CHUNK_EXISTS", conn);
3146 ret = relay_trace_chunk_exists(header, conn, payload);
3147 break;
8614e600
MD
3148 case RELAYD_GET_CONFIGURATION:
3149 DBG_CMD("RELAYD_GET_CONFIGURATION", conn);
3150 ret = relay_get_configuration(header, conn, payload);
3151 break;
b8aa1682
JD
3152 case RELAYD_UPDATE_SYNC_INFO:
3153 default:
5312a3ed 3154 ERR("Received unknown command (%u)", header->cmd);
58eb9381 3155 relay_unknown_command(conn);
b8aa1682
JD
3156 ret = -1;
3157 goto end;
3158 }
3159
3160end:
3161 return ret;
3162}
3163
5569b118
JG
3164static enum relay_connection_status relay_process_control_receive_payload(
3165 struct relay_connection *conn)
5312a3ed
JG
3166{
3167 int ret = 0;
5569b118 3168 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG
3169 struct lttng_dynamic_buffer *reception_buffer =
3170 &conn->protocol.ctrl.reception_buffer;
3171 struct ctrl_connection_state_receive_payload *state =
3172 &conn->protocol.ctrl.state.receive_payload;
3173 struct lttng_buffer_view payload_view;
3174
3175 if (state->left_to_receive == 0) {
3176 /* Short-circuit for payload-less commands. */
3177 goto reception_complete;
3178 }
3179
3180 ret = conn->sock->ops->recvmsg(conn->sock,
3181 reception_buffer->data + state->received,
3182 state->left_to_receive, MSG_DONTWAIT);
3183 if (ret < 0) {
5569b118
JG
3184 if (errno != EAGAIN && errno != EWOULDBLOCK) {
3185 PERROR("Unable to receive command payload on sock %d",
3186 conn->sock->fd);
3187 status = RELAY_CONNECTION_STATUS_ERROR;
3188 }
5312a3ed
JG
3189 goto end;
3190 } else if (ret == 0) {
3191 DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
5569b118 3192 status = RELAY_CONNECTION_STATUS_CLOSED;
5312a3ed
JG
3193 goto end;
3194 }
3195
3196 assert(ret > 0);
3197 assert(ret <= state->left_to_receive);
3198
3199 state->left_to_receive -= ret;
3200 state->received += ret;
3201
3202 if (state->left_to_receive > 0) {
3203 /*
3204 * Can't transition to the protocol's next state, wait to
3205 * receive the rest of the header.
3206 */
3207 DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
3208 state->received, state->left_to_receive,
3209 conn->sock->fd);
5312a3ed
JG
3210 goto end;
3211 }
3212
3213reception_complete:
3214 DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
3215 conn->sock->fd, state->received);
3216 /*
3217 * The payload required to process the command has been received.
3218 * A view to the reception buffer is forwarded to the various
3219 * commands and the state of the control is reset on success.
3220 *
3221 * Commands are responsible for sending their reply to the peer.
3222 */
3223 payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
3224 0, -1);
3225 ret = relay_process_control_command(conn,
3226 &state->header, &payload_view);
3227 if (ret < 0) {
5569b118 3228 status = RELAY_CONNECTION_STATUS_ERROR;
5312a3ed
JG
3229 goto end;
3230 }
3231
3232 ret = connection_reset_protocol_state(conn);
5569b118
JG
3233 if (ret) {
3234 status = RELAY_CONNECTION_STATUS_ERROR;
3235 }
5312a3ed 3236end:
5569b118 3237 return status;
5312a3ed
JG
3238}
3239
5569b118
JG
3240static enum relay_connection_status relay_process_control_receive_header(
3241 struct relay_connection *conn)
5312a3ed
JG
3242{
3243 int ret = 0;
5569b118 3244 enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
5312a3ed
JG
3245 struct lttcomm_relayd_hdr header;
3246 struct lttng_dynamic_buffer *reception_buffer =
3247 &conn->protocol.ctrl.reception_buffer;
3248 struct ctrl_connection_state_receive_header *state =
3249 &conn->protocol.ctrl.state.receive_header;
3250
3251 assert(state->left_to_receive != 0);
3252
3253 ret = conn->sock->ops->recvmsg(conn->sock,
3254 reception_buffer->data + state->received,
3255 state->left_to_receive, MSG_DONTWAIT);
3256 if (ret < 0) {
5569b118
JG
3257 if (errno != EAGAIN &am