Pass the consumerd stream's trace archive id to the relayd
[lttng-tools.git] / src / common / relayd / relayd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _LGPL_SOURCE
19 #include <assert.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/stat.h>
24 #include <inttypes.h>
25
26 #include <common/common.h>
27 #include <common/defaults.h>
28 #include <common/compat/endian.h>
29 #include <common/sessiond-comm/relayd.h>
30 #include <common/index/ctf-index.h>
31
32 #include "relayd.h"
33
34 /*
35 * Send command. Fill up the header and append the data.
36 */
37 static int send_command(struct lttcomm_relayd_sock *rsock,
38 enum lttcomm_relayd_command cmd, const void *data, size_t size,
39 int flags)
40 {
41 int ret;
42 struct lttcomm_relayd_hdr header;
43 char *buf;
44 uint64_t buf_size = sizeof(header);
45
46 if (rsock->sock.fd < 0) {
47 return -ECONNRESET;
48 }
49
50 if (data) {
51 buf_size += size;
52 }
53
54 buf = zmalloc(buf_size);
55 if (buf == NULL) {
56 PERROR("zmalloc relayd send command buf");
57 ret = -1;
58 goto alloc_error;
59 }
60
61 memset(&header, 0, sizeof(header));
62 header.cmd = htobe32(cmd);
63 header.data_size = htobe64(size);
64
65 /* Zeroed for now since not used. */
66 header.cmd_version = 0;
67 header.circuit_id = 0;
68
69 /* Prepare buffer to send. */
70 memcpy(buf, &header, sizeof(header));
71 if (data) {
72 memcpy(buf + sizeof(header), data, size);
73 }
74
75 DBG3("Relayd sending command %d of size %" PRIu64, (int) cmd, buf_size);
76 ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
77 if (ret < 0) {
78 PERROR("Failed to send command %d of size %" PRIu64,
79 (int) cmd, buf_size);
80 ret = -errno;
81 goto error;
82 }
83 error:
84 free(buf);
85 alloc_error:
86 return ret;
87 }
88
89 /*
90 * Receive reply data on socket. This MUST be call after send_command or else
91 * could result in unexpected behavior(s).
92 */
93 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
94 {
95 int ret;
96
97 if (rsock->sock.fd < 0) {
98 return -ECONNRESET;
99 }
100
101 DBG3("Relayd waiting for reply of size %zu", size);
102
103 ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
104 if (ret <= 0 || ret != size) {
105 if (ret == 0) {
106 /* Orderly shutdown. */
107 DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
108 } else {
109 DBG("Receiving reply failed on sock %d for size %zu with ret %d",
110 rsock->sock.fd, size, ret);
111 }
112 /* Always return -1 here and the caller can use errno. */
113 ret = -1;
114 goto error;
115 }
116
117 error:
118 return ret;
119 }
120
121 /*
122 * Starting from 2.11, RELAYD_CREATE_SESSION payload (session_name & hostname)
123 * have no length restriction on the sender side.
124 * Length for both payloads is stored in the msg struct. A new dynamic size
125 * payload size is introduced.
126 */
127 static int relayd_create_session_2_11(struct lttcomm_relayd_sock *rsock,
128 char *session_name, char *hostname,
129 int session_live_timer, unsigned int snapshot)
130 {
131 int ret;
132 struct lttcomm_relayd_create_session_2_11 *msg = NULL;
133 size_t session_name_len;
134 size_t hostname_len;
135 size_t msg_length;
136
137 /* The two names are sent with a '\0' delimiter between them. */
138 session_name_len = strlen(session_name) + 1;
139 hostname_len = strlen(hostname) + 1;
140
141 msg_length = sizeof(*msg) + session_name_len + hostname_len;
142 msg = zmalloc(msg_length);
143 if (!msg) {
144 PERROR("zmalloc create_session_2_11 command message");
145 ret = -1;
146 goto error;
147 }
148
149 assert(session_name_len <= UINT32_MAX);
150 msg->session_name_len = htobe32(session_name_len);
151
152 assert(hostname_len <= UINT32_MAX);
153 msg->hostname_len = htobe32(hostname_len);
154
155 if (lttng_strncpy(msg->names, session_name, session_name_len)) {
156 ret = -1;
157 goto error;
158 }
159 if (lttng_strncpy(msg->names + session_name_len, hostname, hostname_len)) {
160 ret = -1;
161 goto error;
162 }
163
164 msg->live_timer = htobe32(session_live_timer);
165 msg->snapshot = !!snapshot;
166
167 /* Send command */
168 ret = send_command(rsock, RELAYD_CREATE_SESSION, msg, msg_length, 0);
169 if (ret < 0) {
170 goto error;
171 }
172 error:
173 free(msg);
174 return ret;
175 }
176 /*
177 * From 2.4 to 2.10, RELAYD_CREATE_SESSION takes additional parameters to
178 * support the live reading capability.
179 */
180 static int relayd_create_session_2_4(struct lttcomm_relayd_sock *rsock,
181 char *session_name, char *hostname, int session_live_timer,
182 unsigned int snapshot)
183 {
184 int ret;
185 struct lttcomm_relayd_create_session_2_4 msg;
186
187 if (lttng_strncpy(msg.session_name, session_name,
188 sizeof(msg.session_name))) {
189 ret = -1;
190 goto error;
191 }
192 if (lttng_strncpy(msg.hostname, hostname, sizeof(msg.hostname))) {
193 ret = -1;
194 goto error;
195 }
196 msg.live_timer = htobe32(session_live_timer);
197 msg.snapshot = htobe32(snapshot);
198
199 /* Send command */
200 ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
201 if (ret < 0) {
202 goto error;
203 }
204
205 error:
206 return ret;
207 }
208
209 /*
210 * RELAYD_CREATE_SESSION from 2.1 to 2.3.
211 */
212 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock)
213 {
214 int ret;
215
216 /* Send command */
217 ret = send_command(rsock, RELAYD_CREATE_SESSION, NULL, 0, 0);
218 if (ret < 0) {
219 goto error;
220 }
221
222 error:
223 return ret;
224 }
225
226 /*
227 * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
228 * set session_id of the relayd if we have a successful reply from the relayd.
229 *
230 * On success, return 0 else a negative value which is either an errno error or
231 * a lttng error code from the relayd.
232 */
233 int relayd_create_session(struct lttcomm_relayd_sock *rsock, uint64_t *session_id,
234 char *session_name, char *hostname, int session_live_timer,
235 unsigned int snapshot)
236 {
237 int ret;
238 struct lttcomm_relayd_status_session reply;
239
240 assert(rsock);
241 assert(session_id);
242
243 DBG("Relayd create session");
244
245 if (rsock->minor < 4) {
246 /* From 2.1 to 2.3 */
247 ret = relayd_create_session_2_1(rsock);
248 } else if (rsock->minor >= 4 && rsock->minor < 11) {
249 /* From 2.4 to 2.10 */
250 ret = relayd_create_session_2_4(rsock, session_name,
251 hostname, session_live_timer, snapshot);
252 } else {
253 /* From 2.11 to ... */
254 ret = relayd_create_session_2_11(rsock, session_name,
255 hostname, session_live_timer, snapshot);
256 }
257
258 if (ret < 0) {
259 goto error;
260 }
261
262 /* Receive response */
263 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
264 if (ret < 0) {
265 goto error;
266 }
267
268 reply.session_id = be64toh(reply.session_id);
269 reply.ret_code = be32toh(reply.ret_code);
270
271 /* Return session id or negative ret code. */
272 if (reply.ret_code != LTTNG_OK) {
273 ret = -1;
274 ERR("Relayd create session replied error %d", reply.ret_code);
275 goto error;
276 } else {
277 ret = 0;
278 *session_id = reply.session_id;
279 }
280
281 DBG("Relayd session created with id %" PRIu64, reply.session_id);
282
283 error:
284 return ret;
285 }
286
287 static int relayd_add_stream_2_1(struct lttcomm_relayd_sock *rsock,
288 const char *channel_name, const char *pathname)
289 {
290 int ret;
291 struct lttcomm_relayd_add_stream msg;
292
293 memset(&msg, 0, sizeof(msg));
294 if (lttng_strncpy(msg.channel_name, channel_name,
295 sizeof(msg.channel_name))) {
296 ret = -1;
297 goto error;
298 }
299
300 if (lttng_strncpy(msg.pathname, pathname,
301 sizeof(msg.pathname))) {
302 ret = -1;
303 goto error;
304 }
305
306 /* Send command */
307 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
308 if (ret < 0) {
309 ret = -1;
310 goto error;
311 }
312 ret = 0;
313 error:
314 return ret;
315 }
316
317 static int relayd_add_stream_2_2(struct lttcomm_relayd_sock *rsock,
318 const char *channel_name, const char *pathname,
319 uint64_t tracefile_size, uint64_t tracefile_count)
320 {
321 int ret;
322 struct lttcomm_relayd_add_stream_2_2 msg;
323
324 memset(&msg, 0, sizeof(msg));
325 /* Compat with relayd 2.2 to 2.10 */
326 if (lttng_strncpy(msg.channel_name, channel_name,
327 sizeof(msg.channel_name))) {
328 ret = -1;
329 goto error;
330 }
331 if (lttng_strncpy(msg.pathname, pathname,
332 sizeof(msg.pathname))) {
333 ret = -1;
334 goto error;
335 }
336 msg.tracefile_size = htobe64(tracefile_size);
337 msg.tracefile_count = htobe64(tracefile_count);
338
339 /* Send command */
340 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
341 if (ret < 0) {
342 goto error;
343 }
344 ret = 0;
345 error:
346 return ret;
347 }
348
349 static int relayd_add_stream_2_11(struct lttcomm_relayd_sock *rsock,
350 const char *channel_name, const char *pathname,
351 uint64_t tracefile_size, uint64_t tracefile_count)
352 {
353 int ret;
354 struct lttcomm_relayd_add_stream_2_11 *msg = NULL;
355 size_t channel_name_len;
356 size_t pathname_len;
357 size_t msg_length;
358
359 /* The two names are sent with a '\0' delimiter between them. */
360 channel_name_len = strlen(channel_name) + 1;
361 pathname_len = strlen(pathname) + 1;
362
363 msg_length = sizeof(*msg) + channel_name_len + pathname_len;
364 msg = zmalloc(msg_length);
365 if (!msg) {
366 PERROR("zmalloc add_stream_2_11 command message");
367 ret = -1;
368 goto error;
369 }
370
371 assert(channel_name_len <= UINT32_MAX);
372 msg->channel_name_len = htobe32(channel_name_len);
373
374 assert(pathname_len <= UINT32_MAX);
375 msg->pathname_len = htobe32(pathname_len);
376
377 if (lttng_strncpy(msg->names, channel_name, channel_name_len)) {
378 ret = -1;
379 goto error;
380 }
381 if (lttng_strncpy(msg->names + channel_name_len, pathname, pathname_len)) {
382 ret = -1;
383 goto error;
384 }
385
386 msg->tracefile_size = htobe64(tracefile_size);
387 msg->tracefile_count = htobe64(tracefile_count);
388
389 /* Send command */
390 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) msg, msg_length, 0);
391 if (ret < 0) {
392 goto error;
393 }
394 ret = 0;
395 error:
396 free(msg);
397 return ret;
398 }
399
400 /*
401 * Add stream on the relayd and assign stream handle to the stream_id argument.
402 *
403 * On success return 0 else return ret_code negative value.
404 */
405 int relayd_add_stream(struct lttcomm_relayd_sock *rsock, const char *channel_name,
406 const char *pathname, uint64_t *stream_id,
407 uint64_t tracefile_size, uint64_t tracefile_count,
408 uint64_t trace_archive_id)
409 {
410 int ret;
411 struct lttcomm_relayd_status_stream reply;
412
413 /* Code flow error. Safety net. */
414 assert(rsock);
415 assert(channel_name);
416 assert(pathname);
417
418 DBG("Relayd adding stream for channel name %s", channel_name);
419
420 /* Compat with relayd 2.1 */
421 if (rsock->minor == 1) {
422 /* For 2.1 */
423 ret = relayd_add_stream_2_1(rsock, channel_name, pathname);
424
425 } else if (rsock->minor > 1 && rsock->minor < 11) {
426 /* From 2.2 to 2.10 */
427 ret = relayd_add_stream_2_2(rsock, channel_name, pathname,
428 tracefile_size, tracefile_count);
429 } else {
430 /* From 2.11 to ...*/
431 ret = relayd_add_stream_2_11(rsock, channel_name, pathname,
432 tracefile_size, tracefile_count);
433 }
434
435 if (ret) {
436 ret = -1;
437 goto error;
438 }
439
440 /* Waiting for reply */
441 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
442 if (ret < 0) {
443 goto error;
444 }
445
446 /* Back to host bytes order. */
447 reply.handle = be64toh(reply.handle);
448 reply.ret_code = be32toh(reply.ret_code);
449
450 /* Return session id or negative ret code. */
451 if (reply.ret_code != LTTNG_OK) {
452 ret = -1;
453 ERR("Relayd add stream replied error %d", reply.ret_code);
454 } else {
455 /* Success */
456 ret = 0;
457 *stream_id = reply.handle;
458 }
459
460 DBG("Relayd stream added successfully with handle %" PRIu64,
461 reply.handle);
462
463 error:
464 return ret;
465 }
466
467 /*
468 * Inform the relay that all the streams for the current channel has been sent.
469 *
470 * On success return 0 else return ret_code negative value.
471 */
472 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
473 {
474 int ret;
475 struct lttcomm_relayd_generic_reply reply;
476
477 /* Code flow error. Safety net. */
478 assert(rsock);
479
480 DBG("Relayd sending streams sent.");
481
482 /* This feature was introduced in 2.4, ignore it for earlier versions. */
483 if (rsock->minor < 4) {
484 ret = 0;
485 goto end;
486 }
487
488 /* Send command */
489 ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
490 if (ret < 0) {
491 goto error;
492 }
493
494 /* Waiting for reply */
495 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
496 if (ret < 0) {
497 goto error;
498 }
499
500 /* Back to host bytes order. */
501 reply.ret_code = be32toh(reply.ret_code);
502
503 /* Return session id or negative ret code. */
504 if (reply.ret_code != LTTNG_OK) {
505 ret = -1;
506 ERR("Relayd streams sent replied error %d", reply.ret_code);
507 goto error;
508 } else {
509 /* Success */
510 ret = 0;
511 }
512
513 DBG("Relayd streams sent success");
514
515 error:
516 end:
517 return ret;
518 }
519
520 /*
521 * Check version numbers on the relayd.
522 * If major versions are compatible, we assign minor_to_use to the
523 * minor version of the procotol we are going to use for this session.
524 *
525 * Return 0 if the two daemons are compatible, LTTNG_ERR_RELAYD_VERSION_FAIL
526 * otherwise, or a negative value on network errors.
527 */
528 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
529 {
530 int ret;
531 struct lttcomm_relayd_version msg;
532
533 /* Code flow error. Safety net. */
534 assert(rsock);
535
536 DBG("Relayd version check for major.minor %u.%u", rsock->major,
537 rsock->minor);
538
539 memset(&msg, 0, sizeof(msg));
540 /* Prepare network byte order before transmission. */
541 msg.major = htobe32(rsock->major);
542 msg.minor = htobe32(rsock->minor);
543
544 /* Send command */
545 ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
546 if (ret < 0) {
547 goto error;
548 }
549
550 /* Receive response */
551 ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
552 if (ret < 0) {
553 goto error;
554 }
555
556 /* Set back to host bytes order */
557 msg.major = be32toh(msg.major);
558 msg.minor = be32toh(msg.minor);
559
560 /*
561 * Only validate the major version. If the other side is higher,
562 * communication is not possible. Only major version equal can talk to each
563 * other. If the minor version differs, the lowest version is used by both
564 * sides.
565 */
566 if (msg.major != rsock->major) {
567 /* Not compatible */
568 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
569 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
570 msg.major, rsock->major);
571 goto error;
572 }
573
574 /*
575 * If the relayd's minor version is higher, it will adapt to our version so
576 * we can continue to use the latest relayd communication data structure.
577 * If the received minor version is higher, the relayd should adapt to us.
578 */
579 if (rsock->minor > msg.minor) {
580 rsock->minor = msg.minor;
581 }
582
583 /* Version number compatible */
584 DBG2("Relayd version is compatible, using protocol version %u.%u",
585 rsock->major, rsock->minor);
586 ret = 0;
587
588 error:
589 return ret;
590 }
591
592 /*
593 * Add stream on the relayd and assign stream handle to the stream_id argument.
594 *
595 * On success return 0 else return ret_code negative value.
596 */
597 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
598 {
599 int ret;
600
601 /* Code flow error. Safety net. */
602 assert(rsock);
603
604 DBG("Relayd sending metadata of size %zu", len);
605
606 /* Send command */
607 ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
608 if (ret < 0) {
609 goto error;
610 }
611
612 DBG2("Relayd metadata added successfully");
613
614 /*
615 * After that call, the metadata data MUST be sent to the relayd so the
616 * receive size on the other end matches the len of the metadata packet
617 * header. This is why we don't wait for a reply here.
618 */
619
620 error:
621 return ret;
622 }
623
624 /*
625 * Connect to relay daemon with an allocated lttcomm_relayd_sock.
626 */
627 int relayd_connect(struct lttcomm_relayd_sock *rsock)
628 {
629 /* Code flow error. Safety net. */
630 assert(rsock);
631
632 if (!rsock->sock.ops) {
633 /*
634 * Attempting a connect on a non-initialized socket.
635 */
636 return -ECONNRESET;
637 }
638
639 DBG3("Relayd connect ...");
640
641 return rsock->sock.ops->connect(&rsock->sock);
642 }
643
644 /*
645 * Close relayd socket with an allocated lttcomm_relayd_sock.
646 *
647 * If no socket operations are found, simply return 0 meaning that everything
648 * is fine. Without operations, the socket can not possibly be opened or used.
649 * This is possible if the socket was allocated but not created. However, the
650 * caller could simply use it to store a valid file descriptor for instance
651 * passed over a Unix socket and call this to cleanup but still without a valid
652 * ops pointer.
653 *
654 * Return the close returned value. On error, a negative value is usually
655 * returned back from close(2).
656 */
657 int relayd_close(struct lttcomm_relayd_sock *rsock)
658 {
659 int ret;
660
661 /* Code flow error. Safety net. */
662 assert(rsock);
663
664 /* An invalid fd is fine, return success. */
665 if (rsock->sock.fd < 0) {
666 ret = 0;
667 goto end;
668 }
669
670 DBG3("Relayd closing socket %d", rsock->sock.fd);
671
672 if (rsock->sock.ops) {
673 ret = rsock->sock.ops->close(&rsock->sock);
674 } else {
675 /* Default call if no specific ops found. */
676 ret = close(rsock->sock.fd);
677 if (ret < 0) {
678 PERROR("relayd_close default close");
679 }
680 }
681 rsock->sock.fd = -1;
682
683 end:
684 return ret;
685 }
686
687 /*
688 * Send data header structure to the relayd.
689 */
690 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
691 struct lttcomm_relayd_data_hdr *hdr, size_t size)
692 {
693 int ret;
694
695 /* Code flow error. Safety net. */
696 assert(rsock);
697 assert(hdr);
698
699 if (rsock->sock.fd < 0) {
700 return -ECONNRESET;
701 }
702
703 DBG3("Relayd sending data header of size %zu", size);
704
705 /* Again, safety net */
706 if (size == 0) {
707 size = sizeof(struct lttcomm_relayd_data_hdr);
708 }
709
710 /* Only send data header. */
711 ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
712 if (ret < 0) {
713 ret = -errno;
714 goto error;
715 }
716
717 /*
718 * The data MUST be sent right after that command for the receive on the
719 * other end to match the size in the header.
720 */
721
722 error:
723 return ret;
724 }
725
726 /*
727 * Send close stream command to the relayd.
728 */
729 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
730 uint64_t last_net_seq_num)
731 {
732 int ret;
733 struct lttcomm_relayd_close_stream msg;
734 struct lttcomm_relayd_generic_reply reply;
735
736 /* Code flow error. Safety net. */
737 assert(rsock);
738
739 DBG("Relayd closing stream id %" PRIu64, stream_id);
740
741 memset(&msg, 0, sizeof(msg));
742 msg.stream_id = htobe64(stream_id);
743 msg.last_net_seq_num = htobe64(last_net_seq_num);
744
745 /* Send command */
746 ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
747 if (ret < 0) {
748 goto error;
749 }
750
751 /* Receive response */
752 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
753 if (ret < 0) {
754 goto error;
755 }
756
757 reply.ret_code = be32toh(reply.ret_code);
758
759 /* Return session id or negative ret code. */
760 if (reply.ret_code != LTTNG_OK) {
761 ret = -1;
762 ERR("Relayd close stream replied error %d", reply.ret_code);
763 } else {
764 /* Success */
765 ret = 0;
766 }
767
768 DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
769
770 error:
771 return ret;
772 }
773
774 /*
775 * Check for data availability for a given stream id.
776 *
777 * Return 0 if NOT pending, 1 if so and a negative value on error.
778 */
779 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
780 uint64_t last_net_seq_num)
781 {
782 int ret;
783 struct lttcomm_relayd_data_pending msg;
784 struct lttcomm_relayd_generic_reply reply;
785
786 /* Code flow error. Safety net. */
787 assert(rsock);
788
789 DBG("Relayd data pending for stream id %" PRIu64, stream_id);
790
791 memset(&msg, 0, sizeof(msg));
792 msg.stream_id = htobe64(stream_id);
793 msg.last_net_seq_num = htobe64(last_net_seq_num);
794
795 /* Send command */
796 ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
797 sizeof(msg), 0);
798 if (ret < 0) {
799 goto error;
800 }
801
802 /* Receive response */
803 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
804 if (ret < 0) {
805 goto error;
806 }
807
808 reply.ret_code = be32toh(reply.ret_code);
809
810 /* Return session id or negative ret code. */
811 if (reply.ret_code >= LTTNG_OK) {
812 ERR("Relayd data pending replied error %d", reply.ret_code);
813 }
814
815 /* At this point, the ret code is either 1 or 0 */
816 ret = reply.ret_code;
817
818 DBG("Relayd data is %s pending for stream id %" PRIu64,
819 ret == 1 ? "" : "NOT", stream_id);
820
821 error:
822 return ret;
823 }
824
825 /*
826 * Check on the relayd side for a quiescent state on the control socket.
827 */
828 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
829 uint64_t metadata_stream_id)
830 {
831 int ret;
832 struct lttcomm_relayd_quiescent_control msg;
833 struct lttcomm_relayd_generic_reply reply;
834
835 /* Code flow error. Safety net. */
836 assert(rsock);
837
838 DBG("Relayd checking quiescent control state");
839
840 memset(&msg, 0, sizeof(msg));
841 msg.stream_id = htobe64(metadata_stream_id);
842
843 /* Send command */
844 ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
845 if (ret < 0) {
846 goto error;
847 }
848
849 /* Receive response */
850 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
851 if (ret < 0) {
852 goto error;
853 }
854
855 reply.ret_code = be32toh(reply.ret_code);
856
857 /* Return session id or negative ret code. */
858 if (reply.ret_code != LTTNG_OK) {
859 ret = -1;
860 ERR("Relayd quiescent control replied error %d", reply.ret_code);
861 goto error;
862 }
863
864 /* Control socket is quiescent */
865 return 0;
866
867 error:
868 return ret;
869 }
870
871 /*
872 * Begin a data pending command for a specific session id.
873 */
874 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
875 {
876 int ret;
877 struct lttcomm_relayd_begin_data_pending msg;
878 struct lttcomm_relayd_generic_reply reply;
879
880 /* Code flow error. Safety net. */
881 assert(rsock);
882
883 DBG("Relayd begin data pending");
884
885 memset(&msg, 0, sizeof(msg));
886 msg.session_id = htobe64(id);
887
888 /* Send command */
889 ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
890 if (ret < 0) {
891 goto error;
892 }
893
894 /* Receive response */
895 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
896 if (ret < 0) {
897 goto error;
898 }
899
900 reply.ret_code = be32toh(reply.ret_code);
901
902 /* Return session id or negative ret code. */
903 if (reply.ret_code != LTTNG_OK) {
904 ret = -1;
905 ERR("Relayd begin data pending replied error %d", reply.ret_code);
906 goto error;
907 }
908
909 return 0;
910
911 error:
912 return ret;
913 }
914
915 /*
916 * End a data pending command for a specific session id.
917 *
918 * Return 0 on success and set is_data_inflight to 0 if no data is being
919 * streamed or 1 if it is the case.
920 */
921 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
922 unsigned int *is_data_inflight)
923 {
924 int ret, recv_ret;
925 struct lttcomm_relayd_end_data_pending msg;
926 struct lttcomm_relayd_generic_reply reply;
927
928 /* Code flow error. Safety net. */
929 assert(rsock);
930
931 DBG("Relayd end data pending");
932
933 memset(&msg, 0, sizeof(msg));
934 msg.session_id = htobe64(id);
935
936 /* Send command */
937 ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
938 if (ret < 0) {
939 goto error;
940 }
941
942 /* Receive response */
943 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
944 if (ret < 0) {
945 goto error;
946 }
947
948 recv_ret = be32toh(reply.ret_code);
949 if (recv_ret < 0) {
950 ret = recv_ret;
951 goto error;
952 }
953
954 *is_data_inflight = recv_ret;
955
956 DBG("Relayd end data pending is data inflight: %d", recv_ret);
957
958 return 0;
959
960 error:
961 return ret;
962 }
963
964 /*
965 * Send index to the relayd.
966 */
967 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
968 struct ctf_packet_index *index, uint64_t relay_stream_id,
969 uint64_t net_seq_num)
970 {
971 int ret;
972 struct lttcomm_relayd_index msg;
973 struct lttcomm_relayd_generic_reply reply;
974
975 /* Code flow error. Safety net. */
976 assert(rsock);
977
978 if (rsock->minor < 4) {
979 DBG("Not sending indexes before protocol 2.4");
980 ret = 0;
981 goto error;
982 }
983
984 DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
985
986 memset(&msg, 0, sizeof(msg));
987 msg.relay_stream_id = htobe64(relay_stream_id);
988 msg.net_seq_num = htobe64(net_seq_num);
989
990 /* The index is already in big endian. */
991 msg.packet_size = index->packet_size;
992 msg.content_size = index->content_size;
993 msg.timestamp_begin = index->timestamp_begin;
994 msg.timestamp_end = index->timestamp_end;
995 msg.events_discarded = index->events_discarded;
996 msg.stream_id = index->stream_id;
997
998 if (rsock->minor >= 8) {
999 msg.stream_instance_id = index->stream_instance_id;
1000 msg.packet_seq_num = index->packet_seq_num;
1001 }
1002
1003 /* Send command */
1004 ret = send_command(rsock, RELAYD_SEND_INDEX, &msg,
1005 lttcomm_relayd_index_len(lttng_to_index_major(rsock->major,
1006 rsock->minor),
1007 lttng_to_index_minor(rsock->major, rsock->minor)),
1008 0);
1009 if (ret < 0) {
1010 goto error;
1011 }
1012
1013 /* Receive response */
1014 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1015 if (ret < 0) {
1016 goto error;
1017 }
1018
1019 reply.ret_code = be32toh(reply.ret_code);
1020
1021 /* Return session id or negative ret code. */
1022 if (reply.ret_code != LTTNG_OK) {
1023 ret = -1;
1024 ERR("Relayd send index replied error %d", reply.ret_code);
1025 } else {
1026 /* Success */
1027 ret = 0;
1028 }
1029
1030 error:
1031 return ret;
1032 }
1033
1034 /*
1035 * Ask the relay to reset the metadata trace file (regeneration).
1036 */
1037 int relayd_reset_metadata(struct lttcomm_relayd_sock *rsock,
1038 uint64_t stream_id, uint64_t version)
1039 {
1040 int ret;
1041 struct lttcomm_relayd_reset_metadata msg;
1042 struct lttcomm_relayd_generic_reply reply;
1043
1044 /* Code flow error. Safety net. */
1045 assert(rsock);
1046
1047 /* Should have been prevented by the sessiond. */
1048 if (rsock->minor < 8) {
1049 ERR("Metadata regeneration unsupported before 2.8");
1050 ret = -1;
1051 goto error;
1052 }
1053
1054 DBG("Relayd reset metadata stream id %" PRIu64, stream_id);
1055
1056 memset(&msg, 0, sizeof(msg));
1057 msg.stream_id = htobe64(stream_id);
1058 msg.version = htobe64(version);
1059
1060 /* Send command */
1061 ret = send_command(rsock, RELAYD_RESET_METADATA, (void *) &msg, sizeof(msg), 0);
1062 if (ret < 0) {
1063 goto error;
1064 }
1065
1066 /* Receive response */
1067 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1068 if (ret < 0) {
1069 goto error;
1070 }
1071
1072 reply.ret_code = be32toh(reply.ret_code);
1073
1074 /* Return session id or negative ret code. */
1075 if (reply.ret_code != LTTNG_OK) {
1076 ret = -1;
1077 ERR("Relayd reset metadata replied error %d", reply.ret_code);
1078 } else {
1079 /* Success */
1080 ret = 0;
1081 }
1082
1083 DBG("Relayd reset metadata stream id %" PRIu64 " successfully", stream_id);
1084
1085 error:
1086 return ret;
1087 }
1088
1089 int relayd_rotate_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
1090 const char *new_pathname, uint64_t new_chunk_id,
1091 uint64_t seq_num)
1092 {
1093 int ret;
1094 struct lttcomm_relayd_rotate_stream *msg = NULL;
1095 struct lttcomm_relayd_generic_reply reply;
1096 size_t len;
1097 int msg_len;
1098
1099 /* Code flow error. Safety net. */
1100 assert(rsock);
1101
1102 DBG("Sending rotate stream id %" PRIu64 " command to relayd", stream_id);
1103
1104 /* Account for the trailing NULL. */
1105 len = strnlen(new_pathname, LTTNG_PATH_MAX) + 1;
1106 if (len > LTTNG_PATH_MAX) {
1107 ERR("Path used in relayd rotate stream command exceeds the maximal allowed length");
1108 ret = -1;
1109 goto error;
1110 }
1111
1112 msg_len = offsetof(struct lttcomm_relayd_rotate_stream, new_pathname) + len;
1113 msg = zmalloc(msg_len);
1114 if (!msg) {
1115 PERROR("Failed to allocate relayd rotate stream command of %d bytes",
1116 msg_len);
1117 ret = -1;
1118 goto error;
1119 }
1120
1121 if (lttng_strncpy(msg->new_pathname, new_pathname, len)) {
1122 ret = -1;
1123 ERR("Failed to copy relayd rotate stream command's new path name");
1124 goto error;
1125 }
1126
1127 msg->pathname_length = htobe32(len);
1128 msg->stream_id = htobe64(stream_id);
1129 msg->new_chunk_id = htobe64(new_chunk_id);
1130 /*
1131 * The seq_num is invalid for metadata streams, but it is ignored on
1132 * the relay.
1133 */
1134 msg->rotate_at_seq_num = htobe64(seq_num);
1135
1136 /* Send command. */
1137 ret = send_command(rsock, RELAYD_ROTATE_STREAM, (void *) msg, msg_len, 0);
1138 if (ret < 0) {
1139 ERR("Send rotate command");
1140 goto error;
1141 }
1142
1143 /* Receive response. */
1144 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1145 if (ret < 0) {
1146 ERR("Receive rotate reply");
1147 goto error;
1148 }
1149
1150 reply.ret_code = be32toh(reply.ret_code);
1151
1152 /* Return session id or negative ret code. */
1153 if (reply.ret_code != LTTNG_OK) {
1154 ret = -1;
1155 ERR("Relayd rotate stream replied error %d", reply.ret_code);
1156 } else {
1157 /* Success. */
1158 ret = 0;
1159 DBG("Relayd rotated stream id %" PRIu64 " successfully", stream_id);
1160 }
1161
1162 error:
1163 free(msg);
1164 return ret;
1165 }
1166
1167 int relayd_rotate_rename(struct lttcomm_relayd_sock *rsock,
1168 const char *old_path, const char *new_path)
1169 {
1170 int ret;
1171 struct lttcomm_relayd_rotate_rename *msg = NULL;
1172 struct lttcomm_relayd_generic_reply reply;
1173 size_t old_path_length, new_path_length;
1174 size_t msg_length;
1175
1176 /* Code flow error. Safety net. */
1177 assert(rsock);
1178
1179 DBG("Relayd rename chunk %s to %s", old_path, new_path);
1180
1181 /* The two paths are sent with a '\0' delimiter between them. */
1182 old_path_length = strlen(old_path) + 1;
1183 new_path_length = strlen(new_path) + 1;
1184
1185 msg_length = sizeof(*msg) + old_path_length + new_path_length;
1186 msg = zmalloc(msg_length);
1187 if (!msg) {
1188 PERROR("zmalloc rotate-rename command message");
1189 ret = -1;
1190 goto error;
1191 }
1192
1193 assert(old_path_length <= UINT32_MAX);
1194 msg->old_path_length = htobe32(old_path_length);
1195
1196 assert(new_path_length <= UINT32_MAX);
1197 msg->new_path_length = htobe32(new_path_length);
1198
1199 strcpy(msg->paths, old_path);
1200 strcpy(msg->paths + old_path_length, new_path);
1201
1202 /* Send command */
1203 ret = send_command(rsock, RELAYD_ROTATE_RENAME, (const void *) msg,
1204 msg_length, 0);
1205 if (ret < 0) {
1206 goto error;
1207 }
1208
1209 /* Receive response */
1210 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1211 if (ret < 0) {
1212 goto error;
1213 }
1214
1215 reply.ret_code = be32toh(reply.ret_code);
1216
1217 /* Return session id or negative ret code. */
1218 if (reply.ret_code != LTTNG_OK) {
1219 ret = -1;
1220 ERR("Relayd rotate rename replied error %d", reply.ret_code);
1221 } else {
1222 /* Success */
1223 ret = 0;
1224 }
1225
1226 DBG("Relayd rotate rename completed successfully");
1227
1228 error:
1229 free(msg);
1230 return ret;
1231 }
1232
1233 int relayd_rotate_pending(struct lttcomm_relayd_sock *rsock, uint64_t chunk_id)
1234 {
1235 int ret;
1236 struct lttcomm_relayd_rotate_pending msg;
1237 struct lttcomm_relayd_rotate_pending_reply reply;
1238
1239 /* Code flow error. Safety net. */
1240 assert(rsock);
1241
1242 DBG("Querying relayd for rotate pending with chunk_id %" PRIu64,
1243 chunk_id);
1244
1245 memset(&msg, 0, sizeof(msg));
1246 msg.chunk_id = htobe64(chunk_id);
1247
1248 /* Send command */
1249 ret = send_command(rsock, RELAYD_ROTATE_PENDING, (void *) &msg,
1250 sizeof(msg), 0);
1251 if (ret < 0) {
1252 goto error;
1253 }
1254
1255 /* Receive response */
1256 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1257 if (ret < 0) {
1258 goto error;
1259 }
1260
1261 reply.generic.ret_code = be32toh(reply.generic.ret_code);
1262
1263 /* Return session id or negative ret code. */
1264 if (reply.generic.ret_code != LTTNG_OK) {
1265 ret = -reply.generic.ret_code;
1266 ERR("Relayd rotate pending replied with error %d", ret);
1267 goto error;
1268 } else {
1269 /* No error, just rotate pending state */
1270 if (reply.is_pending == 0 || reply.is_pending == 1) {
1271 ret = reply.is_pending;
1272 DBG("Relayd rotate pending command completed successfully with result \"%s\"",
1273 ret ? "rotation pending" : "rotation NOT pending");
1274 } else {
1275 ret = -LTTNG_ERR_UNK;
1276 }
1277 }
1278
1279 error:
1280 return ret;
1281 }
1282
1283 int relayd_mkdir(struct lttcomm_relayd_sock *rsock, const char *path)
1284 {
1285 int ret;
1286 struct lttcomm_relayd_mkdir *msg;
1287 struct lttcomm_relayd_generic_reply reply;
1288 size_t len;
1289
1290 /* Code flow error. Safety net. */
1291 assert(rsock);
1292
1293 DBG("Relayd mkdir path %s", path);
1294
1295 len = strlen(path) + 1;
1296 msg = zmalloc(sizeof(msg->length) + len);
1297 if (!msg) {
1298 PERROR("Alloc mkdir msg");
1299 ret = -1;
1300 goto error;
1301 }
1302 msg->length = htobe32((uint32_t) len);
1303
1304 if (lttng_strncpy(msg->path, path, len)) {
1305 ret = -1;
1306 goto error;
1307 }
1308
1309 /* Send command */
1310 ret = send_command(rsock, RELAYD_MKDIR, (void *) msg,
1311 sizeof(msg->length) + len, 0);
1312 if (ret < 0) {
1313 goto error;
1314 }
1315
1316 /* Receive response */
1317 ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1318 if (ret < 0) {
1319 goto error;
1320 }
1321
1322 reply.ret_code = be32toh(reply.ret_code);
1323
1324 /* Return session id or negative ret code. */
1325 if (reply.ret_code != LTTNG_OK) {
1326 ret = -1;
1327 ERR("Relayd mkdir replied error %d", reply.ret_code);
1328 } else {
1329 /* Success */
1330 ret = 0;
1331 }
1332
1333 DBG("Relayd mkdir completed successfully");
1334
1335 error:
1336 free(msg);
1337 return ret;
1338 }
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