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 _GNU_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/sessiond-comm/relayd.h>
  29 #include <common/index/ctf-index.h>
  30
  31 #include "relayd.h"
  32
  33 /*
  34  * Send command. Fill up the header and append the data.
  35  */
  36 static int send_command(struct lttcomm_relayd_sock *rsock,
  37                 enum lttcomm_relayd_command cmd, void *data, size_t size,
  38                 int flags)
  39 {
  40         int ret;
  41         struct lttcomm_relayd_hdr header;
  42         char *buf;
  43         uint64_t buf_size = sizeof(header);
  44
  45         if (rsock->sock.fd < 0) {
  46                 return -ECONNRESET;
  47         }
  48
  49         if (data) {
  50                 buf_size += size;
  51         }
  52
  53         buf = zmalloc(buf_size);
  54         if (buf == NULL) {
  55                 PERROR("zmalloc relayd send command buf");
  56                 ret = -1;
  57                 goto alloc_error;
  58         }
  59
  60         header.cmd = htobe32(cmd);
  61         header.data_size = htobe64(size);
  62
  63         /* Zeroed for now since not used. */
  64         header.cmd_version = 0;
  65         header.circuit_id = 0;
  66
  67         /* Prepare buffer to send. */
  68         memcpy(buf, &header, sizeof(header));
  69         if (data) {
  70                 memcpy(buf + sizeof(header), data, size);
  71         }
  72
  73         ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  74         if (ret < 0) {
  75                 ret = -errno;
  76                 goto error;
  77         }
  78
  79         DBG3("Relayd sending command %d of size %" PRIu64, cmd, buf_size);
  80
  81 error:
  82         free(buf);
  83 alloc_error:
  84         return ret;
  85 }
  86
  87 /*
  88  * Receive reply data on socket. This MUST be call after send_command or else
  89  * could result in unexpected behavior(s).
  90  */
  91 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
  92 {
  93         int ret;
  94
  95         if (rsock->sock.fd < 0) {
  96                 return -ECONNRESET;
  97         }
  98
  99         DBG3("Relayd waiting for reply of size %zu", size);
 100
 101         ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
 102         if (ret <= 0 || ret != size) {
 103                 if (ret == 0) {
 104                         /* Orderly shutdown. */
 105                         DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
 106                 } else {
 107                         DBG("Receiving reply failed on sock %d for size %zu with ret %d",
 108                                         rsock->sock.fd, size, ret);
 109                 }
 110                 /* Always return -1 here and the caller can use errno. */
 111                 ret = -1;
 112                 goto error;
 113         }
 114
 115 error:
 116         return ret;
 117 }
 118
 119 /*
 120  * Starting at 2.4, RELAYD_CREATE_SESSION takes additional parameters to
 121  * support the live reading capability.
 122  */
 123 static int relayd_create_session_2_4(struct lttcomm_relayd_sock *rsock,
 124                 uint64_t *session_id, char *session_name, char *hostname,
 125                 int session_live_timer, unsigned int snapshot)
 126 {
 127         int ret;
 128         struct lttcomm_relayd_create_session_2_4 msg;
 129
 130         strncpy(msg.session_name, session_name, sizeof(msg.session_name));
 131         strncpy(msg.hostname, hostname, sizeof(msg.hostname));
 132         msg.live_timer = htobe32(session_live_timer);
 133         msg.snapshot = htobe32(snapshot);
 134
 135         /* Send command */
 136         ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
 137         if (ret < 0) {
 138                 goto error;
 139         }
 140
 141 error:
 142         return ret;
 143 }
 144
 145 /*
 146  * RELAYD_CREATE_SESSION from 2.1 to 2.3.
 147  */
 148 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock,
 149                 uint64_t *session_id)
 150 {
 151         int ret;
 152
 153         /* Send command */
 154         ret = send_command(rsock, RELAYD_CREATE_SESSION, NULL, 0, 0);
 155         if (ret < 0) {
 156                 goto error;
 157         }
 158
 159 error:
 160         return ret;
 161 }
 162
 163 /*
 164  * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
 165  * set session_id of the relayd if we have a successful reply from the relayd.
 166  *
 167  * On success, return 0 else a negative value which is either an errno error or
 168  * a lttng error code from the relayd.
 169  */
 170 int relayd_create_session(struct lttcomm_relayd_sock *rsock, uint64_t *session_id,
 171                 char *session_name, char *hostname, int session_live_timer,
 172                 unsigned int snapshot)
 173 {
 174         int ret;
 175         struct lttcomm_relayd_status_session reply;
 176
 177         assert(rsock);
 178         assert(session_id);
 179
 180         DBG("Relayd create session");
 181
 182         switch(rsock->minor) {
 183                 case 1:
 184                 case 2:
 185                 case 3:
 186                         ret = relayd_create_session_2_1(rsock, session_id);
 187                         break;
 188                 case 4:
 189                 default:
 190                         ret = relayd_create_session_2_4(rsock, session_id, session_name,
 191                                         hostname, session_live_timer, snapshot);
 192                         break;
 193         }
 194
 195         if (ret < 0) {
 196                 goto error;
 197         }
 198
 199         /* Receive response */
 200         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 201         if (ret < 0) {
 202                 goto error;
 203         }
 204
 205         reply.session_id = be64toh(reply.session_id);
 206         reply.ret_code = be32toh(reply.ret_code);
 207
 208         /* Return session id or negative ret code. */
 209         if (reply.ret_code != LTTNG_OK) {
 210                 ret = -1;
 211                 ERR("Relayd create session replied error %d", reply.ret_code);
 212                 goto error;
 213         } else {
 214                 ret = 0;
 215                 *session_id = reply.session_id;
 216         }
 217
 218         DBG("Relayd session created with id %" PRIu64, reply.session_id);
 219
 220 error:
 221         return ret;
 222 }
 223
 224 /*
 225  * Add stream on the relayd and assign stream handle to the stream_id argument.
 226  *
 227  * On success return 0 else return ret_code negative value.
 228  */
 229 int relayd_add_stream(struct lttcomm_relayd_sock *rsock, const char *channel_name,
 230                 const char *pathname, uint64_t *stream_id,
 231                 uint64_t tracefile_size, uint64_t tracefile_count)
 232 {
 233         int ret;
 234         struct lttcomm_relayd_add_stream msg;
 235         struct lttcomm_relayd_add_stream_2_2 msg_2_2;
 236         struct lttcomm_relayd_status_stream reply;
 237
 238         /* Code flow error. Safety net. */
 239         assert(rsock);
 240         assert(channel_name);
 241         assert(pathname);
 242
 243         DBG("Relayd adding stream for channel name %s", channel_name);
 244
 245         /* Compat with relayd 2.1 */
 246         if (rsock->minor == 1) {
 247                 strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name));
 248                 strncpy(msg.pathname, pathname, sizeof(msg.pathname));
 249
 250                 /* Send command */
 251                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 252                 if (ret < 0) {
 253                         goto error;
 254                 }
 255         } else {
 256                 /* Compat with relayd 2.2+ */
 257                 strncpy(msg_2_2.channel_name, channel_name, sizeof(msg_2_2.channel_name));
 258                 strncpy(msg_2_2.pathname, pathname, sizeof(msg_2_2.pathname));
 259                 msg_2_2.tracefile_size = htobe64(tracefile_size);
 260                 msg_2_2.tracefile_count = htobe64(tracefile_count);
 261
 262                 /* Send command */
 263                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg_2_2, sizeof(msg_2_2), 0);
 264                 if (ret < 0) {
 265                         goto error;
 266                 }
 267         }
 268
 269         /* Waiting for reply */
 270         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 271         if (ret < 0) {
 272                 goto error;
 273         }
 274
 275         /* Back to host bytes order. */
 276         reply.handle = be64toh(reply.handle);
 277         reply.ret_code = be32toh(reply.ret_code);
 278
 279         /* Return session id or negative ret code. */
 280         if (reply.ret_code != LTTNG_OK) {
 281                 ret = -1;
 282                 ERR("Relayd add stream replied error %d", reply.ret_code);
 283         } else {
 284                 /* Success */
 285                 ret = 0;
 286                 *stream_id = reply.handle;
 287         }
 288
 289         DBG("Relayd stream added successfully with handle %" PRIu64,
 290                 reply.handle);
 291
 292 error:
 293         return ret;
 294 }
 295
 296 /*
 297  * Inform the relay that all the streams for the current channel has been sent.
 298  *
 299  * On success return 0 else return ret_code negative value.
 300  */
 301 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 302 {
 303         int ret;
 304         struct lttcomm_relayd_generic_reply reply;
 305
 306         /* Code flow error. Safety net. */
 307         assert(rsock);
 308
 309         DBG("Relayd sending streams sent.");
 310
 311         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 312         if (rsock->minor < 4) {
 313                 ret = 0;
 314                 goto end;
 315         }
 316
 317         /* Send command */
 318         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 319         if (ret < 0) {
 320                 goto error;
 321         }
 322
 323         /* Waiting for reply */
 324         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 325         if (ret < 0) {
 326                 goto error;
 327         }
 328
 329         /* Back to host bytes order. */
 330         reply.ret_code = be32toh(reply.ret_code);
 331
 332         /* Return session id or negative ret code. */
 333         if (reply.ret_code != LTTNG_OK) {
 334                 ret = -1;
 335                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 336                 goto error;
 337         } else {
 338                 /* Success */
 339                 ret = 0;
 340         }
 341
 342         DBG("Relayd streams sent success");
 343
 344 error:
 345 end:
 346         return ret;
 347 }
 348
 349 /*
 350  * Check version numbers on the relayd.
 351  * If major versions are compatible, we assign minor_to_use to the
 352  * minor version of the procotol we are going to use for this session.
 353  *
 354  * Return 0 if compatible else negative value.
 355  */
 356 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 357 {
 358         int ret;
 359         struct lttcomm_relayd_version msg;
 360
 361         /* Code flow error. Safety net. */
 362         assert(rsock);
 363
 364         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 365                         rsock->minor);
 366
 367         /* Prepare network byte order before transmission. */
 368         msg.major = htobe32(rsock->major);
 369         msg.minor = htobe32(rsock->minor);
 370
 371         /* Send command */
 372         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 373         if (ret < 0) {
 374                 goto error;
 375         }
 376
 377         /* Receive response */
 378         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 379         if (ret < 0) {
 380                 goto error;
 381         }
 382
 383         /* Set back to host bytes order */
 384         msg.major = be32toh(msg.major);
 385         msg.minor = be32toh(msg.minor);
 386
 387         /*
 388          * Only validate the major version. If the other side is higher,
 389          * communication is not possible. Only major version equal can talk to each
 390          * other. If the minor version differs, the lowest version is used by both
 391          * sides.
 392          */
 393         if (msg.major != rsock->major) {
 394                 /* Not compatible */
 395                 ret = -1;
 396                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 397                                 msg.major, rsock->major);
 398                 goto error;
 399         }
 400
 401         /*
 402          * If the relayd's minor version is higher, it will adapt to our version so
 403          * we can continue to use the latest relayd communication data structure.
 404          * If the received minor version is higher, the relayd should adapt to us.
 405          */
 406         if (rsock->minor > msg.minor) {
 407                 rsock->minor = msg.minor;
 408         }
 409
 410         /* Version number compatible */
 411         DBG2("Relayd version is compatible, using protocol version %u.%u",
 412                         rsock->major, rsock->minor);
 413         ret = 0;
 414
 415 error:
 416         return ret;
 417 }
 418
 419 /*
 420  * Add stream on the relayd and assign stream handle to the stream_id argument.
 421  *
 422  * On success return 0 else return ret_code negative value.
 423  */
 424 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 425 {
 426         int ret;
 427
 428         /* Code flow error. Safety net. */
 429         assert(rsock);
 430
 431         DBG("Relayd sending metadata of size %zu", len);
 432
 433         /* Send command */
 434         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 435         if (ret < 0) {
 436                 goto error;
 437         }
 438
 439         DBG2("Relayd metadata added successfully");
 440
 441         /*
 442          * After that call, the metadata data MUST be sent to the relayd so the
 443          * receive size on the other end matches the len of the metadata packet
 444          * header. This is why we don't wait for a reply here.
 445          */
 446
 447 error:
 448         return ret;
 449 }
 450
 451 /*
 452  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 453  */
 454 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 455 {
 456         /* Code flow error. Safety net. */
 457         assert(rsock);
 458
 459         if (!rsock->sock.ops) {
 460                 /*
 461                  * Attempting a connect on a non-initialized socket.
 462                  */
 463                 return -ECONNRESET;
 464         }
 465
 466         DBG3("Relayd connect ...");
 467
 468         return rsock->sock.ops->connect(&rsock->sock);
 469 }
 470
 471 /*
 472  * Close relayd socket with an allocated lttcomm_relayd_sock.
 473  *
 474  * If no socket operations are found, simply return 0 meaning that everything
 475  * is fine. Without operations, the socket can not possibly be opened or used.
 476  * This is possible if the socket was allocated but not created. However, the
 477  * caller could simply use it to store a valid file descriptor for instance
 478  * passed over a Unix socket and call this to cleanup but still without a valid
 479  * ops pointer.
 480  *
 481  * Return the close returned value. On error, a negative value is usually
 482  * returned back from close(2).
 483  */
 484 int relayd_close(struct lttcomm_relayd_sock *rsock)
 485 {
 486         int ret;
 487
 488         /* Code flow error. Safety net. */
 489         assert(rsock);
 490
 491         /* An invalid fd is fine, return success. */
 492         if (rsock->sock.fd < 0) {
 493                 ret = 0;
 494                 goto end;
 495         }
 496
 497         DBG3("Relayd closing socket %d", rsock->sock.fd);
 498
 499         if (rsock->sock.ops) {
 500                 ret = rsock->sock.ops->close(&rsock->sock);
 501         } else {
 502                 /* Default call if no specific ops found. */
 503                 ret = close(rsock->sock.fd);
 504                 if (ret < 0) {
 505                         PERROR("relayd_close default close");
 506                 }
 507         }
 508         rsock->sock.fd = -1;
 509
 510 end:
 511         return ret;
 512 }
 513
 514 /*
 515  * Send data header structure to the relayd.
 516  */
 517 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 518                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 519 {
 520         int ret;
 521
 522         /* Code flow error. Safety net. */
 523         assert(rsock);
 524         assert(hdr);
 525
 526         if (rsock->sock.fd < 0) {
 527                 return -ECONNRESET;
 528         }
 529
 530         DBG3("Relayd sending data header of size %zu", size);
 531
 532         /* Again, safety net */
 533         if (size == 0) {
 534                 size = sizeof(struct lttcomm_relayd_data_hdr);
 535         }
 536
 537         /* Only send data header. */
 538         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 539         if (ret < 0) {
 540                 ret = -errno;
 541                 goto error;
 542         }
 543
 544         /*
 545          * The data MUST be sent right after that command for the receive on the
 546          * other end to match the size in the header.
 547          */
 548
 549 error:
 550         return ret;
 551 }
 552
 553 /*
 554  * Send close stream command to the relayd.
 555  */
 556 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 557                 uint64_t last_net_seq_num)
 558 {
 559         int ret;
 560         struct lttcomm_relayd_close_stream msg;
 561         struct lttcomm_relayd_generic_reply reply;
 562
 563         /* Code flow error. Safety net. */
 564         assert(rsock);
 565
 566         DBG("Relayd closing stream id %" PRIu64, stream_id);
 567
 568         msg.stream_id = htobe64(stream_id);
 569         msg.last_net_seq_num = htobe64(last_net_seq_num);
 570
 571         /* Send command */
 572         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 573         if (ret < 0) {
 574                 goto error;
 575         }
 576
 577         /* Receive response */
 578         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 579         if (ret < 0) {
 580                 goto error;
 581         }
 582
 583         reply.ret_code = be32toh(reply.ret_code);
 584
 585         /* Return session id or negative ret code. */
 586         if (reply.ret_code != LTTNG_OK) {
 587                 ret = -1;
 588                 ERR("Relayd close stream replied error %d", reply.ret_code);
 589         } else {
 590                 /* Success */
 591                 ret = 0;
 592         }
 593
 594         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 595
 596 error:
 597         return ret;
 598 }
 599
 600 /*
 601  * Check for data availability for a given stream id.
 602  *
 603  * Return 0 if NOT pending, 1 if so and a negative value on error.
 604  */
 605 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 606                 uint64_t last_net_seq_num)
 607 {
 608         int ret;
 609         struct lttcomm_relayd_data_pending msg;
 610         struct lttcomm_relayd_generic_reply reply;
 611
 612         /* Code flow error. Safety net. */
 613         assert(rsock);
 614
 615         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 616
 617         msg.stream_id = htobe64(stream_id);
 618         msg.last_net_seq_num = htobe64(last_net_seq_num);
 619
 620         /* Send command */
 621         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 622                         sizeof(msg), 0);
 623         if (ret < 0) {
 624                 goto error;
 625         }
 626
 627         /* Receive response */
 628         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 629         if (ret < 0) {
 630                 goto error;
 631         }
 632
 633         reply.ret_code = be32toh(reply.ret_code);
 634
 635         /* Return session id or negative ret code. */
 636         if (reply.ret_code >= LTTNG_OK) {
 637                 ERR("Relayd data pending replied error %d", reply.ret_code);
 638         }
 639
 640         /* At this point, the ret code is either 1 or 0 */
 641         ret = reply.ret_code;
 642
 643         DBG("Relayd data is %s pending for stream id %" PRIu64,
 644                         ret == 1 ? "" : "NOT", stream_id);
 645
 646 error:
 647         return ret;
 648 }
 649
 650 /*
 651  * Check on the relayd side for a quiescent state on the control socket.
 652  */
 653 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 654                 uint64_t metadata_stream_id)
 655 {
 656         int ret;
 657         struct lttcomm_relayd_quiescent_control msg;
 658         struct lttcomm_relayd_generic_reply reply;
 659
 660         /* Code flow error. Safety net. */
 661         assert(rsock);
 662
 663         DBG("Relayd checking quiescent control state");
 664
 665         msg.stream_id = htobe64(metadata_stream_id);
 666
 667         /* Send command */
 668         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 669         if (ret < 0) {
 670                 goto error;
 671         }
 672
 673         /* Receive response */
 674         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 675         if (ret < 0) {
 676                 goto error;
 677         }
 678
 679         reply.ret_code = be32toh(reply.ret_code);
 680
 681         /* Return session id or negative ret code. */
 682         if (reply.ret_code != LTTNG_OK) {
 683                 ret = -1;
 684                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 685                 goto error;
 686         }
 687
 688         /* Control socket is quiescent */
 689         return 0;
 690
 691 error:
 692         return ret;
 693 }
 694
 695 /*
 696  * Begin a data pending command for a specific session id.
 697  */
 698 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 699 {
 700         int ret;
 701         struct lttcomm_relayd_begin_data_pending msg;
 702         struct lttcomm_relayd_generic_reply reply;
 703
 704         /* Code flow error. Safety net. */
 705         assert(rsock);
 706
 707         DBG("Relayd begin data pending");
 708
 709         msg.session_id = htobe64(id);
 710
 711         /* Send command */
 712         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
 713         if (ret < 0) {
 714                 goto error;
 715         }
 716
 717         /* Receive response */
 718         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 719         if (ret < 0) {
 720                 goto error;
 721         }
 722
 723         reply.ret_code = be32toh(reply.ret_code);
 724
 725         /* Return session id or negative ret code. */
 726         if (reply.ret_code != LTTNG_OK) {
 727                 ret = -1;
 728                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
 729                 goto error;
 730         }
 731
 732         return 0;
 733
 734 error:
 735         return ret;
 736 }
 737
 738 /*
 739  * End a data pending command for a specific session id.
 740  *
 741  * Return 0 on success and set is_data_inflight to 0 if no data is being
 742  * streamed or 1 if it is the case.
 743  */
 744 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
 745                 unsigned int *is_data_inflight)
 746 {
 747         int ret, recv_ret;
 748         struct lttcomm_relayd_end_data_pending msg;
 749         struct lttcomm_relayd_generic_reply reply;
 750
 751         /* Code flow error. Safety net. */
 752         assert(rsock);
 753
 754         DBG("Relayd end data pending");
 755
 756         msg.session_id = htobe64(id);
 757
 758         /* Send command */
 759         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
 760         if (ret < 0) {
 761                 goto error;
 762         }
 763
 764         /* Receive response */
 765         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 766         if (ret < 0) {
 767                 goto error;
 768         }
 769
 770         recv_ret = be32toh(reply.ret_code);
 771         if (recv_ret < 0) {
 772                 ret = recv_ret;
 773                 goto error;
 774         }
 775
 776         *is_data_inflight = recv_ret;
 777
 778         DBG("Relayd end data pending is data inflight: %d", recv_ret);
 779
 780         return 0;
 781
 782 error:
 783         return ret;
 784 }
 785
 786 /*
 787  * Send index to the relayd.
 788  */
 789 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
 790                 struct ctf_packet_index *index, uint64_t relay_stream_id,
 791                 uint64_t net_seq_num)
 792 {
 793         int ret;
 794         struct lttcomm_relayd_index msg;
 795         struct lttcomm_relayd_generic_reply reply;
 796
 797         /* Code flow error. Safety net. */
 798         assert(rsock);
 799
 800         if (rsock->minor < 4) {
 801                 DBG("Not sending indexes before protocol 2.4");
 802                 ret = 0;
 803                 goto error;
 804         }
 805
 806         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
 807
 808         msg.relay_stream_id = htobe64(relay_stream_id);
 809         msg.net_seq_num = htobe64(net_seq_num);
 810
 811         /* The index is already in big endian. */
 812         msg.packet_size = index->packet_size;
 813         msg.content_size = index->content_size;
 814         msg.timestamp_begin = index->timestamp_begin;
 815         msg.timestamp_end = index->timestamp_end;
 816         msg.events_discarded = index->events_discarded;
 817         msg.stream_id = index->stream_id;
 818
 819         /* Send command */
 820         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg, sizeof(msg), 0);
 821         if (ret < 0) {
 822                 goto error;
 823         }
 824
 825         /* Receive response */
 826         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 827         if (ret < 0) {
 828                 goto error;
 829         }
 830
 831         reply.ret_code = be32toh(reply.ret_code);
 832
 833         /* Return session id or negative ret code. */
 834         if (reply.ret_code != LTTNG_OK) {
 835                 ret = -1;
 836                 ERR("Relayd send index replied error %d", reply.ret_code);
 837         } else {
 838                 /* Success */
 839                 ret = 0;
 840         }
 841
 842 error:
 843         return ret;
 844 }