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         if (lttng_strncpy(msg.session_name, session_name,
 134                         sizeof(msg.session_name))) {
 135                 ret = -1;
 136                 goto error;
 137         }
 138         if (lttng_strncpy(msg.hostname, hostname, sizeof(msg.hostname))) {
 139                 ret = -1;
 140                 goto error;
 141         }
 142         msg.live_timer = htobe32(session_live_timer);
 143         msg.snapshot = htobe32(snapshot);
 144
 145         /* Send command */
 146         ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
 147         if (ret < 0) {
 148                 goto error;
 149         }
 150
 151 error:
 152         return ret;
 153 }
 154
 155 /*
 156  * RELAYD_CREATE_SESSION from 2.1 to 2.3.
 157  */
 158 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock,
 159                 uint64_t *session_id)
 160 {
 161         int ret;
 162
 163         /* Send command */
 164         ret = send_command(rsock, RELAYD_CREATE_SESSION, NULL, 0, 0);
 165         if (ret < 0) {
 166                 goto error;
 167         }
 168
 169 error:
 170         return ret;
 171 }
 172
 173 /*
 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.
 176  *
 177  * On success, return 0 else a negative value which is either an errno error or
 178  * a lttng error code from the relayd.
 179  */
 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)
 183 {
 184         int ret;
 185         struct lttcomm_relayd_status_session reply;
 186
 187         assert(rsock);
 188         assert(session_id);
 189
 190         DBG("Relayd create session");
 191
 192         switch(rsock->minor) {
 193                 case 1:
 194                 case 2:
 195                 case 3:
 196                         ret = relayd_create_session_2_1(rsock, session_id);
 197                         break;
 198                 case 4:
 199                 default:
 200                         ret = relayd_create_session_2_4(rsock, session_id, session_name,
 201                                         hostname, session_live_timer, snapshot);
 202                         break;
 203         }
 204
 205         if (ret < 0) {
 206                 goto error;
 207         }
 208
 209         /* Receive response */
 210         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 211         if (ret < 0) {
 212                 goto error;
 213         }
 214
 215         reply.session_id = be64toh(reply.session_id);
 216         reply.ret_code = be32toh(reply.ret_code);
 217
 218         /* Return session id or negative ret code. */
 219         if (reply.ret_code != LTTNG_OK) {
 220                 ret = -1;
 221                 ERR("Relayd create session replied error %d", reply.ret_code);
 222                 goto error;
 223         } else {
 224                 ret = 0;
 225                 *session_id = reply.session_id;
 226         }
 227
 228         DBG("Relayd session created with id %" PRIu64, reply.session_id);
 229
 230 error:
 231         return ret;
 232 }
 233
 234 /*
 235  * Add stream on the relayd and assign stream handle to the stream_id argument.
 236  *
 237  * On success return 0 else return ret_code negative value.
 238  */
 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)
 242 {
 243         int ret;
 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;
 247
 248         /* Code flow error. Safety net. */
 249         assert(rsock);
 250         assert(channel_name);
 251         assert(pathname);
 252
 253         DBG("Relayd adding stream for channel name %s", channel_name);
 254
 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));
 260
 261                 /* Send command */
 262                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 263                 if (ret < 0) {
 264                         goto error;
 265                 }
 266         } else {
 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);
 273
 274                 /* Send command */
 275                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg_2_2, sizeof(msg_2_2), 0);
 276                 if (ret < 0) {
 277                         goto error;
 278                 }
 279         }
 280
 281         /* Waiting for reply */
 282         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 283         if (ret < 0) {
 284                 goto error;
 285         }
 286
 287         /* Back to host bytes order. */
 288         reply.handle = be64toh(reply.handle);
 289         reply.ret_code = be32toh(reply.ret_code);
 290
 291         /* Return session id or negative ret code. */
 292         if (reply.ret_code != LTTNG_OK) {
 293                 ret = -1;
 294                 ERR("Relayd add stream replied error %d", reply.ret_code);
 295         } else {
 296                 /* Success */
 297                 ret = 0;
 298                 *stream_id = reply.handle;
 299         }
 300
 301         DBG("Relayd stream added successfully with handle %" PRIu64,
 302                 reply.handle);
 303
 304 error:
 305         return ret;
 306 }
 307
 308 /*
 309  * Inform the relay that all the streams for the current channel has been sent.
 310  *
 311  * On success return 0 else return ret_code negative value.
 312  */
 313 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 314 {
 315         int ret;
 316         struct lttcomm_relayd_generic_reply reply;
 317
 318         /* Code flow error. Safety net. */
 319         assert(rsock);
 320
 321         DBG("Relayd sending streams sent.");
 322
 323         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 324         if (rsock->minor < 4) {
 325                 ret = 0;
 326                 goto end;
 327         }
 328
 329         /* Send command */
 330         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 331         if (ret < 0) {
 332                 goto error;
 333         }
 334
 335         /* Waiting for reply */
 336         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 337         if (ret < 0) {
 338                 goto error;
 339         }
 340
 341         /* Back to host bytes order. */
 342         reply.ret_code = be32toh(reply.ret_code);
 343
 344         /* Return session id or negative ret code. */
 345         if (reply.ret_code != LTTNG_OK) {
 346                 ret = -1;
 347                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 348                 goto error;
 349         } else {
 350                 /* Success */
 351                 ret = 0;
 352         }
 353
 354         DBG("Relayd streams sent success");
 355
 356 error:
 357 end:
 358         return ret;
 359 }
 360
 361 /*
 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.
 365  *
 366  * Return 0 if compatible else negative value.
 367  */
 368 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 369 {
 370         int ret;
 371         struct lttcomm_relayd_version msg;
 372
 373         /* Code flow error. Safety net. */
 374         assert(rsock);
 375
 376         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 377                         rsock->minor);
 378
 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);
 383
 384         /* Send command */
 385         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 386         if (ret < 0) {
 387                 goto error;
 388         }
 389
 390         /* Receive response */
 391         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 392         if (ret < 0) {
 393                 goto error;
 394         }
 395
 396         /* Set back to host bytes order */
 397         msg.major = be32toh(msg.major);
 398         msg.minor = be32toh(msg.minor);
 399
 400         /*
 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
 404          * sides.
 405          */
 406         if (msg.major != rsock->major) {
 407                 /* Not compatible */
 408                 ret = -1;
 409                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 410                                 msg.major, rsock->major);
 411                 goto error;
 412         }
 413
 414         /*
 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.
 418          */
 419         if (rsock->minor > msg.minor) {
 420                 rsock->minor = msg.minor;
 421         }
 422
 423         /* Version number compatible */
 424         DBG2("Relayd version is compatible, using protocol version %u.%u",
 425                         rsock->major, rsock->minor);
 426         ret = 0;
 427
 428 error:
 429         return ret;
 430 }
 431
 432 /*
 433  * Add stream on the relayd and assign stream handle to the stream_id argument.
 434  *
 435  * On success return 0 else return ret_code negative value.
 436  */
 437 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 438 {
 439         int ret;
 440
 441         /* Code flow error. Safety net. */
 442         assert(rsock);
 443
 444         DBG("Relayd sending metadata of size %zu", len);
 445
 446         /* Send command */
 447         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 448         if (ret < 0) {
 449                 goto error;
 450         }
 451
 452         DBG2("Relayd metadata added successfully");
 453
 454         /*
 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.
 458          */
 459
 460 error:
 461         return ret;
 462 }
 463
 464 /*
 465  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 466  */
 467 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 468 {
 469         /* Code flow error. Safety net. */
 470         assert(rsock);
 471
 472         if (!rsock->sock.ops) {
 473                 /*
 474                  * Attempting a connect on a non-initialized socket.
 475                  */
 476                 return -ECONNRESET;
 477         }
 478
 479         DBG3("Relayd connect ...");
 480
 481         return rsock->sock.ops->connect(&rsock->sock);
 482 }
 483
 484 /*
 485  * Close relayd socket with an allocated lttcomm_relayd_sock.
 486  *
 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
 492  * ops pointer.
 493  *
 494  * Return the close returned value. On error, a negative value is usually
 495  * returned back from close(2).
 496  */
 497 int relayd_close(struct lttcomm_relayd_sock *rsock)
 498 {
 499         int ret;
 500
 501         /* Code flow error. Safety net. */
 502         assert(rsock);
 503
 504         /* An invalid fd is fine, return success. */
 505         if (rsock->sock.fd < 0) {
 506                 ret = 0;
 507                 goto end;
 508         }
 509
 510         DBG3("Relayd closing socket %d", rsock->sock.fd);
 511
 512         if (rsock->sock.ops) {
 513                 ret = rsock->sock.ops->close(&rsock->sock);
 514         } else {
 515                 /* Default call if no specific ops found. */
 516                 ret = close(rsock->sock.fd);
 517                 if (ret < 0) {
 518                         PERROR("relayd_close default close");
 519                 }
 520         }
 521         rsock->sock.fd = -1;
 522
 523 end:
 524         return ret;
 525 }
 526
 527 /*
 528  * Send data header structure to the relayd.
 529  */
 530 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 531                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 532 {
 533         int ret;
 534
 535         /* Code flow error. Safety net. */
 536         assert(rsock);
 537         assert(hdr);
 538
 539         if (rsock->sock.fd < 0) {
 540                 return -ECONNRESET;
 541         }
 542
 543         DBG3("Relayd sending data header of size %zu", size);
 544
 545         /* Again, safety net */
 546         if (size == 0) {
 547                 size = sizeof(struct lttcomm_relayd_data_hdr);
 548         }
 549
 550         /* Only send data header. */
 551         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 552         if (ret < 0) {
 553                 ret = -errno;
 554                 goto error;
 555         }
 556
 557         /*
 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.
 560          */
 561
 562 error:
 563         return ret;
 564 }
 565
 566 /*
 567  * Send close stream command to the relayd.
 568  */
 569 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 570                 uint64_t last_net_seq_num)
 571 {
 572         int ret;
 573         struct lttcomm_relayd_close_stream msg;
 574         struct lttcomm_relayd_generic_reply reply;
 575
 576         /* Code flow error. Safety net. */
 577         assert(rsock);
 578
 579         DBG("Relayd closing stream id %" PRIu64, stream_id);
 580
 581         memset(&msg, 0, sizeof(msg));
 582         msg.stream_id = htobe64(stream_id);
 583         msg.last_net_seq_num = htobe64(last_net_seq_num);
 584
 585         /* Send command */
 586         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 587         if (ret < 0) {
 588                 goto error;
 589         }
 590
 591         /* Receive response */
 592         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 593         if (ret < 0) {
 594                 goto error;
 595         }
 596
 597         reply.ret_code = be32toh(reply.ret_code);
 598
 599         /* Return session id or negative ret code. */
 600         if (reply.ret_code != LTTNG_OK) {
 601                 ret = -1;
 602                 ERR("Relayd close stream replied error %d", reply.ret_code);
 603         } else {
 604                 /* Success */
 605                 ret = 0;
 606         }
 607
 608         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 609
 610 error:
 611         return ret;
 612 }
 613
 614 /*
 615  * Check for data availability for a given stream id.
 616  *
 617  * Return 0 if NOT pending, 1 if so and a negative value on error.
 618  */
 619 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 620                 uint64_t last_net_seq_num)
 621 {
 622         int ret;
 623         struct lttcomm_relayd_data_pending msg;
 624         struct lttcomm_relayd_generic_reply reply;
 625
 626         /* Code flow error. Safety net. */
 627         assert(rsock);
 628
 629         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 630
 631         memset(&msg, 0, sizeof(msg));
 632         msg.stream_id = htobe64(stream_id);
 633         msg.last_net_seq_num = htobe64(last_net_seq_num);
 634
 635         /* Send command */
 636         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 637                         sizeof(msg), 0);
 638         if (ret < 0) {
 639                 goto error;
 640         }
 641
 642         /* Receive response */
 643         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 644         if (ret < 0) {
 645                 goto error;
 646         }
 647
 648         reply.ret_code = be32toh(reply.ret_code);
 649
 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);
 653         }
 654
 655         /* At this point, the ret code is either 1 or 0 */
 656         ret = reply.ret_code;
 657
 658         DBG("Relayd data is %s pending for stream id %" PRIu64,
 659                         ret == 1 ? "" : "NOT", stream_id);
 660
 661 error:
 662         return ret;
 663 }
 664
 665 /*
 666  * Check on the relayd side for a quiescent state on the control socket.
 667  */
 668 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 669                 uint64_t metadata_stream_id)
 670 {
 671         int ret;
 672         struct lttcomm_relayd_quiescent_control msg;
 673         struct lttcomm_relayd_generic_reply reply;
 674
 675         /* Code flow error. Safety net. */
 676         assert(rsock);
 677
 678         DBG("Relayd checking quiescent control state");
 679
 680         memset(&msg, 0, sizeof(msg));
 681         msg.stream_id = htobe64(metadata_stream_id);
 682
 683         /* Send command */
 684         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 685         if (ret < 0) {
 686                 goto error;
 687         }
 688
 689         /* Receive response */
 690         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 691         if (ret < 0) {
 692                 goto error;
 693         }
 694
 695         reply.ret_code = be32toh(reply.ret_code);
 696
 697         /* Return session id or negative ret code. */
 698         if (reply.ret_code != LTTNG_OK) {
 699                 ret = -1;
 700                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 701                 goto error;
 702         }
 703
 704         /* Control socket is quiescent */
 705         return 0;
 706
 707 error:
 708         return ret;
 709 }
 710
 711 /*
 712  * Begin a data pending command for a specific session id.
 713  */
 714 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 715 {
 716         int ret;
 717         struct lttcomm_relayd_begin_data_pending msg;
 718         struct lttcomm_relayd_generic_reply reply;
 719
 720         /* Code flow error. Safety net. */
 721         assert(rsock);
 722
 723         DBG("Relayd begin data pending");
 724
 725         memset(&msg, 0, sizeof(msg));
 726         msg.session_id = htobe64(id);
 727
 728         /* Send command */
 729         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
 730         if (ret < 0) {
 731                 goto error;
 732         }
 733
 734         /* Receive response */
 735         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 736         if (ret < 0) {
 737                 goto error;
 738         }
 739
 740         reply.ret_code = be32toh(reply.ret_code);
 741
 742         /* Return session id or negative ret code. */
 743         if (reply.ret_code != LTTNG_OK) {
 744                 ret = -1;
 745                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
 746                 goto error;
 747         }
 748
 749         return 0;
 750
 751 error:
 752         return ret;
 753 }
 754
 755 /*
 756  * End a data pending command for a specific session id.
 757  *
 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.
 760  */
 761 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
 762                 unsigned int *is_data_inflight)
 763 {
 764         int ret, recv_ret;
 765         struct lttcomm_relayd_end_data_pending msg;
 766         struct lttcomm_relayd_generic_reply reply;
 767
 768         /* Code flow error. Safety net. */
 769         assert(rsock);
 770
 771         DBG("Relayd end data pending");
 772
 773         memset(&msg, 0, sizeof(msg));
 774         msg.session_id = htobe64(id);
 775
 776         /* Send command */
 777         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
 778         if (ret < 0) {
 779                 goto error;
 780         }
 781
 782         /* Receive response */
 783         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 784         if (ret < 0) {
 785                 goto error;
 786         }
 787
 788         recv_ret = be32toh(reply.ret_code);
 789         if (recv_ret < 0) {
 790                 ret = recv_ret;
 791                 goto error;
 792         }
 793
 794         *is_data_inflight = recv_ret;
 795
 796         DBG("Relayd end data pending is data inflight: %d", recv_ret);
 797
 798         return 0;
 799
 800 error:
 801         return ret;
 802 }
 803
 804 /*
 805  * Send index to the relayd.
 806  */
 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)
 810 {
 811         int ret;
 812         struct lttcomm_relayd_index msg;
 813         struct lttcomm_relayd_generic_reply reply;
 814
 815         /* Code flow error. Safety net. */
 816         assert(rsock);
 817
 818         if (rsock->minor < 4) {
 819                 DBG("Not sending indexes before protocol 2.4");
 820                 ret = 0;
 821                 goto error;
 822         }
 823
 824         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
 825
 826         memset(&msg, 0, sizeof(msg));
 827         msg.relay_stream_id = htobe64(relay_stream_id);
 828         msg.net_seq_num = htobe64(net_seq_num);
 829
 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;
 837
 838         /* Send command */
 839         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg, sizeof(msg), 0);
 840         if (ret < 0) {
 841                 goto error;
 842         }
 843
 844         /* Receive response */
 845         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 846         if (ret < 0) {
 847                 goto error;
 848         }
 849
 850         reply.ret_code = be32toh(reply.ret_code);
 851
 852         /* Return session id or negative ret code. */
 853         if (reply.ret_code != LTTNG_OK) {
 854                 ret = -1;
 855                 ERR("Relayd send index replied error %d", reply.ret_code);
 856         } else {
 857                 /* Success */
 858                 ret = 0;
 859         }
 860
 861 error:
 862         return ret;
 863 }