2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
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.
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
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.
27 #include <common/common.h>
28 #include <common/defaults.h>
29 #include <common/compat/endian.h>
30 #include <common/sessiond-comm/relayd.h>
31 #include <common/index/ctf-index.h>
36 * Send command. Fill up the header and append the data.
38 static int send_command(struct lttcomm_relayd_sock
*rsock
,
39 enum lttcomm_relayd_command cmd
, void *data
, size_t size
,
43 struct lttcomm_relayd_hdr header
;
45 uint64_t buf_size
= sizeof(header
);
47 if (rsock
->sock
.fd
< 0) {
55 buf
= zmalloc(buf_size
);
57 PERROR("zmalloc relayd send command buf");
62 memset(&header
, 0, sizeof(header
));
63 header
.cmd
= htobe32(cmd
);
64 header
.data_size
= htobe64(size
);
66 /* Zeroed for now since not used. */
67 header
.cmd_version
= 0;
68 header
.circuit_id
= 0;
70 /* Prepare buffer to send. */
71 memcpy(buf
, &header
, sizeof(header
));
73 memcpy(buf
+ sizeof(header
), data
, size
);
76 ret
= rsock
->sock
.ops
->sendmsg(&rsock
->sock
, buf
, buf_size
, flags
);
82 DBG3("Relayd sending command %d of size %" PRIu64
, cmd
, buf_size
);
91 * Receive reply data on socket. This MUST be call after send_command or else
92 * could result in unexpected behavior(s).
94 static int recv_reply(struct lttcomm_relayd_sock
*rsock
, void *data
, size_t size
)
98 if (rsock
->sock
.fd
< 0) {
102 DBG3("Relayd waiting for reply of size %zu", size
);
104 ret
= rsock
->sock
.ops
->recvmsg(&rsock
->sock
, data
, size
, 0);
105 if (ret
<= 0 || ret
!= size
) {
107 /* Orderly shutdown. */
108 DBG("Socket %d has performed an orderly shutdown", rsock
->sock
.fd
);
110 DBG("Receiving reply failed on sock %d for size %zu with ret %d",
111 rsock
->sock
.fd
, size
, ret
);
113 /* Always return -1 here and the caller can use errno. */
123 * Starting at 2.4, RELAYD_CREATE_SESSION takes additional parameters to
124 * support the live reading capability.
126 static int relayd_create_session_2_4(struct lttcomm_relayd_sock
*rsock
,
127 uint64_t *session_id
, char *session_name
, char *hostname
,
128 int session_live_timer
, unsigned int snapshot
)
131 struct lttcomm_relayd_create_session_2_4 msg
;
133 if (lttng_strncpy(msg
.session_name
, session_name
,
134 sizeof(msg
.session_name
))) {
138 if (lttng_strncpy(msg
.hostname
, hostname
, sizeof(msg
.hostname
))) {
142 msg
.live_timer
= htobe32(session_live_timer
);
143 msg
.snapshot
= htobe32(snapshot
);
146 ret
= send_command(rsock
, RELAYD_CREATE_SESSION
, &msg
, sizeof(msg
), 0);
156 * RELAYD_CREATE_SESSION from 2.1 to 2.3.
158 static int relayd_create_session_2_1(struct lttcomm_relayd_sock
*rsock
,
159 uint64_t *session_id
)
164 ret
= send_command(rsock
, RELAYD_CREATE_SESSION
, NULL
, 0, 0);
174 * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
175 * set session_id of the relayd if we have a successful reply from the relayd.
177 * On success, return 0 else a negative value which is either an errno error or
178 * a lttng error code from the relayd.
180 int relayd_create_session(struct lttcomm_relayd_sock
*rsock
, uint64_t *session_id
,
181 char *session_name
, char *hostname
, int session_live_timer
,
182 unsigned int snapshot
)
185 struct lttcomm_relayd_status_session reply
;
190 DBG("Relayd create session");
192 switch(rsock
->minor
) {
196 ret
= relayd_create_session_2_1(rsock
, session_id
);
200 ret
= relayd_create_session_2_4(rsock
, session_id
, session_name
,
201 hostname
, session_live_timer
, snapshot
);
209 /* Receive response */
210 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
215 reply
.session_id
= be64toh(reply
.session_id
);
216 reply
.ret_code
= be32toh(reply
.ret_code
);
218 /* Return session id or negative ret code. */
219 if (reply
.ret_code
!= LTTNG_OK
) {
221 ERR("Relayd create session replied error %d", reply
.ret_code
);
225 *session_id
= reply
.session_id
;
228 DBG("Relayd session created with id %" PRIu64
, reply
.session_id
);
235 * Add stream on the relayd and assign stream handle to the stream_id argument.
237 * On success return 0 else return ret_code negative value.
239 int relayd_add_stream(struct lttcomm_relayd_sock
*rsock
, const char *channel_name
,
240 const char *pathname
, uint64_t *stream_id
,
241 uint64_t tracefile_size
, uint64_t tracefile_count
)
244 struct lttcomm_relayd_add_stream msg
;
245 struct lttcomm_relayd_add_stream_2_2 msg_2_2
;
246 struct lttcomm_relayd_status_stream reply
;
248 /* Code flow error. Safety net. */
250 assert(channel_name
);
253 DBG("Relayd adding stream for channel name %s", channel_name
);
255 /* Compat with relayd 2.1 */
256 if (rsock
->minor
== 1) {
257 memset(&msg
, 0, sizeof(msg
));
258 strncpy(msg
.channel_name
, channel_name
, sizeof(msg
.channel_name
));
259 strncpy(msg
.pathname
, pathname
, sizeof(msg
.pathname
));
262 ret
= send_command(rsock
, RELAYD_ADD_STREAM
, (void *) &msg
, sizeof(msg
), 0);
267 memset(&msg_2_2
, 0, sizeof(msg_2_2
));
268 /* Compat with relayd 2.2+ */
269 strncpy(msg_2_2
.channel_name
, channel_name
, sizeof(msg_2_2
.channel_name
));
270 strncpy(msg_2_2
.pathname
, pathname
, sizeof(msg_2_2
.pathname
));
271 msg_2_2
.tracefile_size
= htobe64(tracefile_size
);
272 msg_2_2
.tracefile_count
= htobe64(tracefile_count
);
275 ret
= send_command(rsock
, RELAYD_ADD_STREAM
, (void *) &msg_2_2
, sizeof(msg_2_2
), 0);
281 /* Waiting for reply */
282 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
287 /* Back to host bytes order. */
288 reply
.handle
= be64toh(reply
.handle
);
289 reply
.ret_code
= be32toh(reply
.ret_code
);
291 /* Return session id or negative ret code. */
292 if (reply
.ret_code
!= LTTNG_OK
) {
294 ERR("Relayd add stream replied error %d", reply
.ret_code
);
298 *stream_id
= reply
.handle
;
301 DBG("Relayd stream added successfully with handle %" PRIu64
,
309 * Inform the relay that all the streams for the current channel has been sent.
311 * On success return 0 else return ret_code negative value.
313 int relayd_streams_sent(struct lttcomm_relayd_sock
*rsock
)
316 struct lttcomm_relayd_generic_reply reply
;
318 /* Code flow error. Safety net. */
321 DBG("Relayd sending streams sent.");
323 /* This feature was introduced in 2.4, ignore it for earlier versions. */
324 if (rsock
->minor
< 4) {
330 ret
= send_command(rsock
, RELAYD_STREAMS_SENT
, NULL
, 0, 0);
335 /* Waiting for reply */
336 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
341 /* Back to host bytes order. */
342 reply
.ret_code
= be32toh(reply
.ret_code
);
344 /* Return session id or negative ret code. */
345 if (reply
.ret_code
!= LTTNG_OK
) {
347 ERR("Relayd streams sent replied error %d", reply
.ret_code
);
354 DBG("Relayd streams sent success");
362 * Check version numbers on the relayd.
363 * If major versions are compatible, we assign minor_to_use to the
364 * minor version of the procotol we are going to use for this session.
366 * Return 0 if compatible else negative value.
368 int relayd_version_check(struct lttcomm_relayd_sock
*rsock
)
371 struct lttcomm_relayd_version msg
;
373 /* Code flow error. Safety net. */
376 DBG("Relayd version check for major.minor %u.%u", rsock
->major
,
379 memset(&msg
, 0, sizeof(msg
));
380 /* Prepare network byte order before transmission. */
381 msg
.major
= htobe32(rsock
->major
);
382 msg
.minor
= htobe32(rsock
->minor
);
385 ret
= send_command(rsock
, RELAYD_VERSION
, (void *) &msg
, sizeof(msg
), 0);
390 /* Receive response */
391 ret
= recv_reply(rsock
, (void *) &msg
, sizeof(msg
));
396 /* Set back to host bytes order */
397 msg
.major
= be32toh(msg
.major
);
398 msg
.minor
= be32toh(msg
.minor
);
401 * Only validate the major version. If the other side is higher,
402 * communication is not possible. Only major version equal can talk to each
403 * other. If the minor version differs, the lowest version is used by both
406 if (msg
.major
!= rsock
->major
) {
409 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
410 msg
.major
, rsock
->major
);
415 * If the relayd's minor version is higher, it will adapt to our version so
416 * we can continue to use the latest relayd communication data structure.
417 * If the received minor version is higher, the relayd should adapt to us.
419 if (rsock
->minor
> msg
.minor
) {
420 rsock
->minor
= msg
.minor
;
423 /* Version number compatible */
424 DBG2("Relayd version is compatible, using protocol version %u.%u",
425 rsock
->major
, rsock
->minor
);
433 * Add stream on the relayd and assign stream handle to the stream_id argument.
435 * On success return 0 else return ret_code negative value.
437 int relayd_send_metadata(struct lttcomm_relayd_sock
*rsock
, size_t len
)
441 /* Code flow error. Safety net. */
444 DBG("Relayd sending metadata of size %zu", len
);
447 ret
= send_command(rsock
, RELAYD_SEND_METADATA
, NULL
, len
, 0);
452 DBG2("Relayd metadata added successfully");
455 * After that call, the metadata data MUST be sent to the relayd so the
456 * receive size on the other end matches the len of the metadata packet
457 * header. This is why we don't wait for a reply here.
465 * Connect to relay daemon with an allocated lttcomm_relayd_sock.
467 int relayd_connect(struct lttcomm_relayd_sock
*rsock
)
469 /* Code flow error. Safety net. */
472 if (!rsock
->sock
.ops
) {
474 * Attempting a connect on a non-initialized socket.
479 DBG3("Relayd connect ...");
481 return rsock
->sock
.ops
->connect(&rsock
->sock
);
485 * Close relayd socket with an allocated lttcomm_relayd_sock.
487 * If no socket operations are found, simply return 0 meaning that everything
488 * is fine. Without operations, the socket can not possibly be opened or used.
489 * This is possible if the socket was allocated but not created. However, the
490 * caller could simply use it to store a valid file descriptor for instance
491 * passed over a Unix socket and call this to cleanup but still without a valid
494 * Return the close returned value. On error, a negative value is usually
495 * returned back from close(2).
497 int relayd_close(struct lttcomm_relayd_sock
*rsock
)
501 /* Code flow error. Safety net. */
504 /* An invalid fd is fine, return success. */
505 if (rsock
->sock
.fd
< 0) {
510 DBG3("Relayd closing socket %d", rsock
->sock
.fd
);
512 if (rsock
->sock
.ops
) {
513 ret
= rsock
->sock
.ops
->close(&rsock
->sock
);
515 /* Default call if no specific ops found. */
516 ret
= close(rsock
->sock
.fd
);
518 PERROR("relayd_close default close");
528 * Send data header structure to the relayd.
530 int relayd_send_data_hdr(struct lttcomm_relayd_sock
*rsock
,
531 struct lttcomm_relayd_data_hdr
*hdr
, size_t size
)
535 /* Code flow error. Safety net. */
539 if (rsock
->sock
.fd
< 0) {
543 DBG3("Relayd sending data header of size %zu", size
);
545 /* Again, safety net */
547 size
= sizeof(struct lttcomm_relayd_data_hdr
);
550 /* Only send data header. */
551 ret
= rsock
->sock
.ops
->sendmsg(&rsock
->sock
, hdr
, size
, 0);
558 * The data MUST be sent right after that command for the receive on the
559 * other end to match the size in the header.
567 * Send close stream command to the relayd.
569 int relayd_send_close_stream(struct lttcomm_relayd_sock
*rsock
, uint64_t stream_id
,
570 uint64_t last_net_seq_num
)
573 struct lttcomm_relayd_close_stream msg
;
574 struct lttcomm_relayd_generic_reply reply
;
576 /* Code flow error. Safety net. */
579 DBG("Relayd closing stream id %" PRIu64
, stream_id
);
581 memset(&msg
, 0, sizeof(msg
));
582 msg
.stream_id
= htobe64(stream_id
);
583 msg
.last_net_seq_num
= htobe64(last_net_seq_num
);
586 ret
= send_command(rsock
, RELAYD_CLOSE_STREAM
, (void *) &msg
, sizeof(msg
), 0);
591 /* Receive response */
592 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
597 reply
.ret_code
= be32toh(reply
.ret_code
);
599 /* Return session id or negative ret code. */
600 if (reply
.ret_code
!= LTTNG_OK
) {
602 ERR("Relayd close stream replied error %d", reply
.ret_code
);
608 DBG("Relayd close stream id %" PRIu64
" successfully", stream_id
);
615 * Check for data availability for a given stream id.
617 * Return 0 if NOT pending, 1 if so and a negative value on error.
619 int relayd_data_pending(struct lttcomm_relayd_sock
*rsock
, uint64_t stream_id
,
620 uint64_t last_net_seq_num
)
623 struct lttcomm_relayd_data_pending msg
;
624 struct lttcomm_relayd_generic_reply reply
;
626 /* Code flow error. Safety net. */
629 DBG("Relayd data pending for stream id %" PRIu64
, stream_id
);
631 memset(&msg
, 0, sizeof(msg
));
632 msg
.stream_id
= htobe64(stream_id
);
633 msg
.last_net_seq_num
= htobe64(last_net_seq_num
);
636 ret
= send_command(rsock
, RELAYD_DATA_PENDING
, (void *) &msg
,
642 /* Receive response */
643 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
648 reply
.ret_code
= be32toh(reply
.ret_code
);
650 /* Return session id or negative ret code. */
651 if (reply
.ret_code
>= LTTNG_OK
) {
652 ERR("Relayd data pending replied error %d", reply
.ret_code
);
655 /* At this point, the ret code is either 1 or 0 */
656 ret
= reply
.ret_code
;
658 DBG("Relayd data is %s pending for stream id %" PRIu64
,
659 ret
== 1 ? "" : "NOT", stream_id
);
666 * Check on the relayd side for a quiescent state on the control socket.
668 int relayd_quiescent_control(struct lttcomm_relayd_sock
*rsock
,
669 uint64_t metadata_stream_id
)
672 struct lttcomm_relayd_quiescent_control msg
;
673 struct lttcomm_relayd_generic_reply reply
;
675 /* Code flow error. Safety net. */
678 DBG("Relayd checking quiescent control state");
680 memset(&msg
, 0, sizeof(msg
));
681 msg
.stream_id
= htobe64(metadata_stream_id
);
684 ret
= send_command(rsock
, RELAYD_QUIESCENT_CONTROL
, &msg
, sizeof(msg
), 0);
689 /* Receive response */
690 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
695 reply
.ret_code
= be32toh(reply
.ret_code
);
697 /* Return session id or negative ret code. */
698 if (reply
.ret_code
!= LTTNG_OK
) {
700 ERR("Relayd quiescent control replied error %d", reply
.ret_code
);
704 /* Control socket is quiescent */
712 * Begin a data pending command for a specific session id.
714 int relayd_begin_data_pending(struct lttcomm_relayd_sock
*rsock
, uint64_t id
)
717 struct lttcomm_relayd_begin_data_pending msg
;
718 struct lttcomm_relayd_generic_reply reply
;
720 /* Code flow error. Safety net. */
723 DBG("Relayd begin data pending");
725 memset(&msg
, 0, sizeof(msg
));
726 msg
.session_id
= htobe64(id
);
729 ret
= send_command(rsock
, RELAYD_BEGIN_DATA_PENDING
, &msg
, sizeof(msg
), 0);
734 /* Receive response */
735 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
740 reply
.ret_code
= be32toh(reply
.ret_code
);
742 /* Return session id or negative ret code. */
743 if (reply
.ret_code
!= LTTNG_OK
) {
745 ERR("Relayd begin data pending replied error %d", reply
.ret_code
);
756 * End a data pending command for a specific session id.
758 * Return 0 on success and set is_data_inflight to 0 if no data is being
759 * streamed or 1 if it is the case.
761 int relayd_end_data_pending(struct lttcomm_relayd_sock
*rsock
, uint64_t id
,
762 unsigned int *is_data_inflight
)
765 struct lttcomm_relayd_end_data_pending msg
;
766 struct lttcomm_relayd_generic_reply reply
;
768 /* Code flow error. Safety net. */
771 DBG("Relayd end data pending");
773 memset(&msg
, 0, sizeof(msg
));
774 msg
.session_id
= htobe64(id
);
777 ret
= send_command(rsock
, RELAYD_END_DATA_PENDING
, &msg
, sizeof(msg
), 0);
782 /* Receive response */
783 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
788 recv_ret
= be32toh(reply
.ret_code
);
794 *is_data_inflight
= recv_ret
;
796 DBG("Relayd end data pending is data inflight: %d", recv_ret
);
805 * Send index to the relayd.
807 int relayd_send_index(struct lttcomm_relayd_sock
*rsock
,
808 struct ctf_packet_index
*index
, uint64_t relay_stream_id
,
809 uint64_t net_seq_num
)
812 struct lttcomm_relayd_index msg
;
813 struct lttcomm_relayd_generic_reply reply
;
815 /* Code flow error. Safety net. */
818 if (rsock
->minor
< 4) {
819 DBG("Not sending indexes before protocol 2.4");
824 DBG("Relayd sending index for stream ID %" PRIu64
, relay_stream_id
);
826 memset(&msg
, 0, sizeof(msg
));
827 msg
.relay_stream_id
= htobe64(relay_stream_id
);
828 msg
.net_seq_num
= htobe64(net_seq_num
);
830 /* The index is already in big endian. */
831 msg
.packet_size
= index
->packet_size
;
832 msg
.content_size
= index
->content_size
;
833 msg
.timestamp_begin
= index
->timestamp_begin
;
834 msg
.timestamp_end
= index
->timestamp_end
;
835 msg
.events_discarded
= index
->events_discarded
;
836 msg
.stream_id
= index
->stream_id
;
839 ret
= send_command(rsock
, RELAYD_SEND_INDEX
, &msg
, sizeof(msg
), 0);
844 /* Receive response */
845 ret
= recv_reply(rsock
, (void *) &reply
, sizeof(reply
));
850 reply
.ret_code
= be32toh(reply
.ret_code
);
852 /* Return session id or negative ret code. */
853 if (reply
.ret_code
!= LTTNG_OK
) {
855 ERR("Relayd send index replied error %d", reply
.ret_code
);