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 #define _LGPL_SOURCE
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <inttypes.h>
  26
  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>
  32
  33 #include "relayd.h"
  34
  35 /*
  36  * Send command. Fill up the header and append the data.
  37  */
  38 static int send_command(struct lttcomm_relayd_sock *rsock,
  39                 enum lttcomm_relayd_command cmd, void *data, size_t size,
  40                 int flags)
  41 {
  42         int ret;
  43         struct lttcomm_relayd_hdr header;
  44         char *buf;
  45         uint64_t buf_size = sizeof(header);
  46
  47         if (rsock->sock.fd < 0) {
  48                 return -ECONNRESET;
  49         }
  50
  51         if (data) {
  52                 buf_size += size;
  53         }
  54
  55         buf = zmalloc(buf_size);
  56         if (buf == NULL) {
  57                 PERROR("zmalloc relayd send command buf");
  58                 ret = -1;
  59                 goto alloc_error;
  60         }
  61
  62         memset(&header, 0, sizeof(header));
  63         header.cmd = htobe32(cmd);
  64         header.data_size = htobe64(size);
  65
  66         /* Zeroed for now since not used. */
  67         header.cmd_version = 0;
  68         header.circuit_id = 0;
  69
  70         /* Prepare buffer to send. */
  71         memcpy(buf, &header, sizeof(header));
  72         if (data) {
  73                 memcpy(buf + sizeof(header), data, size);
  74         }
  75
  76         ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  77         if (ret < 0) {
  78                 ret = -errno;
  79                 goto error;
  80         }
  81
  82         DBG3("Relayd sending command %d of size %" PRIu64, cmd, buf_size);
  83
  84 error:
  85         free(buf);
  86 alloc_error:
  87         return ret;
  88 }
  89
  90 /*
  91  * Receive reply data on socket. This MUST be call after send_command or else
  92  * could result in unexpected behavior(s).
  93  */
  94 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
  95 {
  96         int ret;
  97
  98         if (rsock->sock.fd < 0) {
  99                 return -ECONNRESET;
 100         }
 101
 102         DBG3("Relayd waiting for reply of size %zu", size);
 103
 104         ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
 105         if (ret <= 0 || ret != size) {
 106                 if (ret == 0) {
 107                         /* Orderly shutdown. */
 108                         DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
 109                 } else {
 110                         DBG("Receiving reply failed on sock %d for size %zu with ret %d",
 111                                         rsock->sock.fd, size, ret);
 112                 }
 113                 /* Always return -1 here and the caller can use errno. */
 114                 ret = -1;
 115                 goto error;
 116         }
 117
 118 error:
 119         return ret;
 120 }
 121
 122 /*
 123  * Starting at 2.4, RELAYD_CREATE_SESSION takes additional parameters to
 124  * support the live reading capability.
 125  */
 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)
 129 {
 130         int ret;
 131         struct lttcomm_relayd_create_session_2_4 msg;
 132
 133         strncpy(msg.session_name, session_name, sizeof(msg.session_name));
 134         strncpy(msg.hostname, hostname, sizeof(msg.hostname));
 135         msg.live_timer = htobe32(session_live_timer);
 136         msg.snapshot = htobe32(snapshot);
 137
 138         /* Send command */
 139         ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
 140         if (ret < 0) {
 141                 goto error;
 142         }
 143
 144 error:
 145         return ret;
 146 }
 147
 148 /*
 149  * RELAYD_CREATE_SESSION from 2.1 to 2.3.
 150  */
 151 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock,
 152                 uint64_t *session_id)
 153 {
 154         int ret;
 155
 156         /* Send command */
 157         ret = send_command(rsock, RELAYD_CREATE_SESSION, NULL, 0, 0);
 158         if (ret < 0) {
 159                 goto error;
 160         }
 161
 162 error:
 163         return ret;
 164 }
 165
 166 /*
 167  * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
 168  * set session_id of the relayd if we have a successful reply from the relayd.
 169  *
 170  * On success, return 0 else a negative value which is either an errno error or
 171  * a lttng error code from the relayd.
 172  */
 173 int relayd_create_session(struct lttcomm_relayd_sock *rsock, uint64_t *session_id,
 174                 char *session_name, char *hostname, int session_live_timer,
 175                 unsigned int snapshot)
 176 {
 177         int ret;
 178         struct lttcomm_relayd_status_session reply;
 179
 180         assert(rsock);
 181         assert(session_id);
 182
 183         DBG("Relayd create session");
 184
 185         switch(rsock->minor) {
 186                 case 1:
 187                 case 2:
 188                 case 3:
 189                         ret = relayd_create_session_2_1(rsock, session_id);
 190                         break;
 191                 case 4:
 192                 default:
 193                         ret = relayd_create_session_2_4(rsock, session_id, session_name,
 194                                         hostname, session_live_timer, snapshot);
 195                         break;
 196         }
 197
 198         if (ret < 0) {
 199                 goto error;
 200         }
 201
 202         /* Receive response */
 203         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 204         if (ret < 0) {
 205                 goto error;
 206         }
 207
 208         reply.session_id = be64toh(reply.session_id);
 209         reply.ret_code = be32toh(reply.ret_code);
 210
 211         /* Return session id or negative ret code. */
 212         if (reply.ret_code != LTTNG_OK) {
 213                 ret = -1;
 214                 ERR("Relayd create session replied error %d", reply.ret_code);
 215                 goto error;
 216         } else {
 217                 ret = 0;
 218                 *session_id = reply.session_id;
 219         }
 220
 221         DBG("Relayd session created with id %" PRIu64, reply.session_id);
 222
 223 error:
 224         return ret;
 225 }
 226
 227 /*
 228  * Add stream on the relayd and assign stream handle to the stream_id argument.
 229  *
 230  * On success return 0 else return ret_code negative value.
 231  */
 232 int relayd_add_stream(struct lttcomm_relayd_sock *rsock, const char *channel_name,
 233                 const char *pathname, uint64_t *stream_id,
 234                 uint64_t tracefile_size, uint64_t tracefile_count)
 235 {
 236         int ret;
 237         struct lttcomm_relayd_add_stream msg;
 238         struct lttcomm_relayd_add_stream_2_2 msg_2_2;
 239         struct lttcomm_relayd_status_stream reply;
 240
 241         /* Code flow error. Safety net. */
 242         assert(rsock);
 243         assert(channel_name);
 244         assert(pathname);
 245
 246         DBG("Relayd adding stream for channel name %s", channel_name);
 247
 248         /* Compat with relayd 2.1 */
 249         if (rsock->minor == 1) {
 250                 memset(&msg, 0, sizeof(msg));
 251                 strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name));
 252                 strncpy(msg.pathname, pathname, sizeof(msg.pathname));
 253
 254                 /* Send command */
 255                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 256                 if (ret < 0) {
 257                         goto error;
 258                 }
 259         } else {
 260                 memset(&msg_2_2, 0, sizeof(msg_2_2));
 261                 /* Compat with relayd 2.2+ */
 262                 strncpy(msg_2_2.channel_name, channel_name, sizeof(msg_2_2.channel_name));
 263                 strncpy(msg_2_2.pathname, pathname, sizeof(msg_2_2.pathname));
 264                 msg_2_2.tracefile_size = htobe64(tracefile_size);
 265                 msg_2_2.tracefile_count = htobe64(tracefile_count);
 266
 267                 /* Send command */
 268                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg_2_2, sizeof(msg_2_2), 0);
 269                 if (ret < 0) {
 270                         goto error;
 271                 }
 272         }
 273
 274         /* Waiting for reply */
 275         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 276         if (ret < 0) {
 277                 goto error;
 278         }
 279
 280         /* Back to host bytes order. */
 281         reply.handle = be64toh(reply.handle);
 282         reply.ret_code = be32toh(reply.ret_code);
 283
 284         /* Return session id or negative ret code. */
 285         if (reply.ret_code != LTTNG_OK) {
 286                 ret = -1;
 287                 ERR("Relayd add stream replied error %d", reply.ret_code);
 288         } else {
 289                 /* Success */
 290                 ret = 0;
 291                 *stream_id = reply.handle;
 292         }
 293
 294         DBG("Relayd stream added successfully with handle %" PRIu64,
 295                 reply.handle);
 296
 297 error:
 298         return ret;
 299 }
 300
 301 /*
 302  * Inform the relay that all the streams for the current channel has been sent.
 303  *
 304  * On success return 0 else return ret_code negative value.
 305  */
 306 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 307 {
 308         int ret;
 309         struct lttcomm_relayd_generic_reply reply;
 310
 311         /* Code flow error. Safety net. */
 312         assert(rsock);
 313
 314         DBG("Relayd sending streams sent.");
 315
 316         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 317         if (rsock->minor < 4) {
 318                 ret = 0;
 319                 goto end;
 320         }
 321
 322         /* Send command */
 323         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 324         if (ret < 0) {
 325                 goto error;
 326         }
 327
 328         /* Waiting for reply */
 329         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 330         if (ret < 0) {
 331                 goto error;
 332         }
 333
 334         /* Back to host bytes order. */
 335         reply.ret_code = be32toh(reply.ret_code);
 336
 337         /* Return session id or negative ret code. */
 338         if (reply.ret_code != LTTNG_OK) {
 339                 ret = -1;
 340                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 341                 goto error;
 342         } else {
 343                 /* Success */
 344                 ret = 0;
 345         }
 346
 347         DBG("Relayd streams sent success");
 348
 349 error:
 350 end:
 351         return ret;
 352 }
 353
 354 /*
 355  * Check version numbers on the relayd.
 356  * If major versions are compatible, we assign minor_to_use to the
 357  * minor version of the procotol we are going to use for this session.
 358  *
 359  * Return 0 if compatible else negative value.
 360  */
 361 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 362 {
 363         int ret;
 364         struct lttcomm_relayd_version msg;
 365
 366         /* Code flow error. Safety net. */
 367         assert(rsock);
 368
 369         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 370                         rsock->minor);
 371
 372         memset(&msg, 0, sizeof(msg));
 373         /* Prepare network byte order before transmission. */
 374         msg.major = htobe32(rsock->major);
 375         msg.minor = htobe32(rsock->minor);
 376
 377         /* Send command */
 378         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 379         if (ret < 0) {
 380                 goto error;
 381         }
 382
 383         /* Receive response */
 384         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 385         if (ret < 0) {
 386                 goto error;
 387         }
 388
 389         /* Set back to host bytes order */
 390         msg.major = be32toh(msg.major);
 391         msg.minor = be32toh(msg.minor);
 392
 393         /*
 394          * Only validate the major version. If the other side is higher,
 395          * communication is not possible. Only major version equal can talk to each
 396          * other. If the minor version differs, the lowest version is used by both
 397          * sides.
 398          */
 399         if (msg.major != rsock->major) {
 400                 /* Not compatible */
 401                 ret = -1;
 402                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 403                                 msg.major, rsock->major);
 404                 goto error;
 405         }
 406
 407         /*
 408          * If the relayd's minor version is higher, it will adapt to our version so
 409          * we can continue to use the latest relayd communication data structure.
 410          * If the received minor version is higher, the relayd should adapt to us.
 411          */
 412         if (rsock->minor > msg.minor) {
 413                 rsock->minor = msg.minor;
 414         }
 415
 416         /* Version number compatible */
 417         DBG2("Relayd version is compatible, using protocol version %u.%u",
 418                         rsock->major, rsock->minor);
 419         ret = 0;
 420
 421 error:
 422         return ret;
 423 }
 424
 425 /*
 426  * Add stream on the relayd and assign stream handle to the stream_id argument.
 427  *
 428  * On success return 0 else return ret_code negative value.
 429  */
 430 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 431 {
 432         int ret;
 433
 434         /* Code flow error. Safety net. */
 435         assert(rsock);
 436
 437         DBG("Relayd sending metadata of size %zu", len);
 438
 439         /* Send command */
 440         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 441         if (ret < 0) {
 442                 goto error;
 443         }
 444
 445         DBG2("Relayd metadata added successfully");
 446
 447         /*
 448          * After that call, the metadata data MUST be sent to the relayd so the
 449          * receive size on the other end matches the len of the metadata packet
 450          * header. This is why we don't wait for a reply here.
 451          */
 452
 453 error:
 454         return ret;
 455 }
 456
 457 /*
 458  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 459  */
 460 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 461 {
 462         /* Code flow error. Safety net. */
 463         assert(rsock);
 464
 465         if (!rsock->sock.ops) {
 466                 /*
 467                  * Attempting a connect on a non-initialized socket.
 468                  */
 469                 return -ECONNRESET;
 470         }
 471
 472         DBG3("Relayd connect ...");
 473
 474         return rsock->sock.ops->connect(&rsock->sock);
 475 }
 476
 477 /*
 478  * Close relayd socket with an allocated lttcomm_relayd_sock.
 479  *
 480  * If no socket operations are found, simply return 0 meaning that everything
 481  * is fine. Without operations, the socket can not possibly be opened or used.
 482  * This is possible if the socket was allocated but not created. However, the
 483  * caller could simply use it to store a valid file descriptor for instance
 484  * passed over a Unix socket and call this to cleanup but still without a valid
 485  * ops pointer.
 486  *
 487  * Return the close returned value. On error, a negative value is usually
 488  * returned back from close(2).
 489  */
 490 int relayd_close(struct lttcomm_relayd_sock *rsock)
 491 {
 492         int ret;
 493
 494         /* Code flow error. Safety net. */
 495         assert(rsock);
 496
 497         /* An invalid fd is fine, return success. */
 498         if (rsock->sock.fd < 0) {
 499                 ret = 0;
 500                 goto end;
 501         }
 502
 503         DBG3("Relayd closing socket %d", rsock->sock.fd);
 504
 505         if (rsock->sock.ops) {
 506                 ret = rsock->sock.ops->close(&rsock->sock);
 507         } else {
 508                 /* Default call if no specific ops found. */
 509                 ret = close(rsock->sock.fd);
 510                 if (ret < 0) {
 511                         PERROR("relayd_close default close");
 512                 }
 513         }
 514         rsock->sock.fd = -1;
 515
 516 end:
 517         return ret;
 518 }
 519
 520 /*
 521  * Send data header structure to the relayd.
 522  */
 523 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 524                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 525 {
 526         int ret;
 527
 528         /* Code flow error. Safety net. */
 529         assert(rsock);
 530         assert(hdr);
 531
 532         if (rsock->sock.fd < 0) {
 533                 return -ECONNRESET;
 534         }
 535
 536         DBG3("Relayd sending data header of size %zu", size);
 537
 538         /* Again, safety net */
 539         if (size == 0) {
 540                 size = sizeof(struct lttcomm_relayd_data_hdr);
 541         }
 542
 543         /* Only send data header. */
 544         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 545         if (ret < 0) {
 546                 ret = -errno;
 547                 goto error;
 548         }
 549
 550         /*
 551          * The data MUST be sent right after that command for the receive on the
 552          * other end to match the size in the header.
 553          */
 554
 555 error:
 556         return ret;
 557 }
 558
 559 /*
 560  * Send close stream command to the relayd.
 561  */
 562 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 563                 uint64_t last_net_seq_num)
 564 {
 565         int ret;
 566         struct lttcomm_relayd_close_stream msg;
 567         struct lttcomm_relayd_generic_reply reply;
 568
 569         /* Code flow error. Safety net. */
 570         assert(rsock);
 571
 572         DBG("Relayd closing stream id %" PRIu64, stream_id);
 573
 574         memset(&msg, 0, sizeof(msg));
 575         msg.stream_id = htobe64(stream_id);
 576         msg.last_net_seq_num = htobe64(last_net_seq_num);
 577
 578         /* Send command */
 579         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 580         if (ret < 0) {
 581                 goto error;
 582         }
 583
 584         /* Receive response */
 585         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 586         if (ret < 0) {
 587                 goto error;
 588         }
 589
 590         reply.ret_code = be32toh(reply.ret_code);
 591
 592         /* Return session id or negative ret code. */
 593         if (reply.ret_code != LTTNG_OK) {
 594                 ret = -1;
 595                 ERR("Relayd close stream replied error %d", reply.ret_code);
 596         } else {
 597                 /* Success */
 598                 ret = 0;
 599         }
 600
 601         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 602
 603 error:
 604         return ret;
 605 }
 606
 607 /*
 608  * Check for data availability for a given stream id.
 609  *
 610  * Return 0 if NOT pending, 1 if so and a negative value on error.
 611  */
 612 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 613                 uint64_t last_net_seq_num)
 614 {
 615         int ret;
 616         struct lttcomm_relayd_data_pending msg;
 617         struct lttcomm_relayd_generic_reply reply;
 618
 619         /* Code flow error. Safety net. */
 620         assert(rsock);
 621
 622         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 623
 624         memset(&msg, 0, sizeof(msg));
 625         msg.stream_id = htobe64(stream_id);
 626         msg.last_net_seq_num = htobe64(last_net_seq_num);
 627
 628         /* Send command */
 629         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 630                         sizeof(msg), 0);
 631         if (ret < 0) {
 632                 goto error;
 633         }
 634
 635         /* Receive response */
 636         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 637         if (ret < 0) {
 638                 goto error;
 639         }
 640
 641         reply.ret_code = be32toh(reply.ret_code);
 642
 643         /* Return session id or negative ret code. */
 644         if (reply.ret_code >= LTTNG_OK) {
 645                 ERR("Relayd data pending replied error %d", reply.ret_code);
 646         }
 647
 648         /* At this point, the ret code is either 1 or 0 */
 649         ret = reply.ret_code;
 650
 651         DBG("Relayd data is %s pending for stream id %" PRIu64,
 652                         ret == 1 ? "" : "NOT", stream_id);
 653
 654 error:
 655         return ret;
 656 }
 657
 658 /*
 659  * Check on the relayd side for a quiescent state on the control socket.
 660  */
 661 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 662                 uint64_t metadata_stream_id)
 663 {
 664         int ret;
 665         struct lttcomm_relayd_quiescent_control msg;
 666         struct lttcomm_relayd_generic_reply reply;
 667
 668         /* Code flow error. Safety net. */
 669         assert(rsock);
 670
 671         DBG("Relayd checking quiescent control state");
 672
 673         memset(&msg, 0, sizeof(msg));
 674         msg.stream_id = htobe64(metadata_stream_id);
 675
 676         /* Send command */
 677         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 678         if (ret < 0) {
 679                 goto error;
 680         }
 681
 682         /* Receive response */
 683         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 684         if (ret < 0) {
 685                 goto error;
 686         }
 687
 688         reply.ret_code = be32toh(reply.ret_code);
 689
 690         /* Return session id or negative ret code. */
 691         if (reply.ret_code != LTTNG_OK) {
 692                 ret = -1;
 693                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 694                 goto error;
 695         }
 696
 697         /* Control socket is quiescent */
 698         return 0;
 699
 700 error:
 701         return ret;
 702 }
 703
 704 /*
 705  * Begin a data pending command for a specific session id.
 706  */
 707 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 708 {
 709         int ret;
 710         struct lttcomm_relayd_begin_data_pending msg;
 711         struct lttcomm_relayd_generic_reply reply;
 712
 713         /* Code flow error. Safety net. */
 714         assert(rsock);
 715
 716         DBG("Relayd begin data pending");
 717
 718         memset(&msg, 0, sizeof(msg));
 719         msg.session_id = htobe64(id);
 720
 721         /* Send command */
 722         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
 723         if (ret < 0) {
 724                 goto error;
 725         }
 726
 727         /* Receive response */
 728         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 729         if (ret < 0) {
 730                 goto error;
 731         }
 732
 733         reply.ret_code = be32toh(reply.ret_code);
 734
 735         /* Return session id or negative ret code. */
 736         if (reply.ret_code != LTTNG_OK) {
 737                 ret = -1;
 738                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
 739                 goto error;
 740         }
 741
 742         return 0;
 743
 744 error:
 745         return ret;
 746 }
 747
 748 /*
 749  * End a data pending command for a specific session id.
 750  *
 751  * Return 0 on success and set is_data_inflight to 0 if no data is being
 752  * streamed or 1 if it is the case.
 753  */
 754 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
 755                 unsigned int *is_data_inflight)
 756 {
 757         int ret, recv_ret;
 758         struct lttcomm_relayd_end_data_pending msg;
 759         struct lttcomm_relayd_generic_reply reply;
 760
 761         /* Code flow error. Safety net. */
 762         assert(rsock);
 763
 764         DBG("Relayd end data pending");
 765
 766         memset(&msg, 0, sizeof(msg));
 767         msg.session_id = htobe64(id);
 768
 769         /* Send command */
 770         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
 771         if (ret < 0) {
 772                 goto error;
 773         }
 774
 775         /* Receive response */
 776         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 777         if (ret < 0) {
 778                 goto error;
 779         }
 780
 781         recv_ret = be32toh(reply.ret_code);
 782         if (recv_ret < 0) {
 783                 ret = recv_ret;
 784                 goto error;
 785         }
 786
 787         *is_data_inflight = recv_ret;
 788
 789         DBG("Relayd end data pending is data inflight: %d", recv_ret);
 790
 791         return 0;
 792
 793 error:
 794         return ret;
 795 }
 796
 797 /*
 798  * Send index to the relayd.
 799  */
 800 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
 801                 struct ctf_packet_index *index, uint64_t relay_stream_id,
 802                 uint64_t net_seq_num)
 803 {
 804         int ret;
 805         struct lttcomm_relayd_index msg;
 806         struct lttcomm_relayd_generic_reply reply;
 807
 808         /* Code flow error. Safety net. */
 809         assert(rsock);
 810
 811         if (rsock->minor < 4) {
 812                 DBG("Not sending indexes before protocol 2.4");
 813                 ret = 0;
 814                 goto error;
 815         }
 816
 817         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
 818
 819         memset(&msg, 0, sizeof(msg));
 820         msg.relay_stream_id = htobe64(relay_stream_id);
 821         msg.net_seq_num = htobe64(net_seq_num);
 822
 823         /* The index is already in big endian. */
 824         msg.packet_size = index->packet_size;
 825         msg.content_size = index->content_size;
 826         msg.timestamp_begin = index->timestamp_begin;
 827         msg.timestamp_end = index->timestamp_end;
 828         msg.events_discarded = index->events_discarded;
 829         msg.stream_id = index->stream_id;
 830
 831         /* Send command */
 832         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg, sizeof(msg), 0);
 833         if (ret < 0) {
 834                 goto error;
 835         }
 836
 837         /* Receive response */
 838         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 839         if (ret < 0) {
 840                 goto error;
 841         }
 842
 843         reply.ret_code = be32toh(reply.ret_code);
 844
 845         /* Return session id or negative ret code. */
 846         if (reply.ret_code != LTTNG_OK) {
 847                 ret = -1;
 848                 ERR("Relayd send index replied error %d", reply.ret_code);
 849         } else {
 850                 /* Success */
 851                 ret = 0;
 852         }
 853
 854 error:
 855         return ret;
 856 }