src/common/relayd/relayd.c

   1 /*
   2  * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <inttypes.h>
  25
  26 #include <common/common.h>
  27 #include <common/defaults.h>
  28 #include <common/compat/endian.h>
  29 #include <common/sessiond-comm/relayd.h>
  30 #include <common/index/ctf-index.h>
  31
  32 #include "relayd.h"
  33
  34 /*
  35  * Send command. Fill up the header and append the data.
  36  */
  37 static int send_command(struct lttcomm_relayd_sock *rsock,
  38                 enum lttcomm_relayd_command cmd, void *data, size_t size,
  39                 int flags)
  40 {
  41         int ret;
  42         struct lttcomm_relayd_hdr header;
  43         char *buf;
  44         uint64_t buf_size = sizeof(header);
  45
  46         if (rsock->sock.fd < 0) {
  47                 return -ECONNRESET;
  48         }
  49
  50         if (data) {
  51                 buf_size += size;
  52         }
  53
  54         buf = zmalloc(buf_size);
  55         if (buf == NULL) {
  56                 PERROR("zmalloc relayd send command buf");
  57                 ret = -1;
  58                 goto alloc_error;
  59         }
  60
  61         memset(&header, 0, sizeof(header));
  62         header.cmd = htobe32(cmd);
  63         header.data_size = htobe64(size);
  64
  65         /* Zeroed for now since not used. */
  66         header.cmd_version = 0;
  67         header.circuit_id = 0;
  68
  69         /* Prepare buffer to send. */
  70         memcpy(buf, &header, sizeof(header));
  71         if (data) {
  72                 memcpy(buf + sizeof(header), data, size);
  73         }
  74
  75         ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  76         if (ret < 0) {
  77                 ret = -errno;
  78                 goto error;
  79         }
  80
  81         DBG3("Relayd sending command %d of size %" PRIu64, cmd, buf_size);
  82
  83 error:
  84         free(buf);
  85 alloc_error:
  86         return ret;
  87 }
  88
  89 /*
  90  * Receive reply data on socket. This MUST be call after send_command or else
  91  * could result in unexpected behavior(s).
  92  */
  93 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
  94 {
  95         int ret;
  96
  97         if (rsock->sock.fd < 0) {
  98                 return -ECONNRESET;
  99         }
 100
 101         DBG3("Relayd waiting for reply of size %zu", size);
 102
 103         ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
 104         if (ret <= 0 || ret != size) {
 105                 if (ret == 0) {
 106                         /* Orderly shutdown. */
 107                         DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
 108                 } else {
 109                         DBG("Receiving reply failed on sock %d for size %zu with ret %d",
 110                                         rsock->sock.fd, size, ret);
 111                 }
 112                 /* Always return -1 here and the caller can use errno. */
 113                 ret = -1;
 114                 goto error;
 115         }
 116
 117 error:
 118         return ret;
 119 }
 120
 121 /*
 122  * Starting at 2.4, RELAYD_CREATE_SESSION takes additional parameters to
 123  * support the live reading capability.
 124  */
 125 static int relayd_create_session_2_4(struct lttcomm_relayd_sock *rsock,
 126                 uint64_t *session_id, char *session_name, char *hostname,
 127                 int session_live_timer, unsigned int snapshot)
 128 {
 129         int ret;
 130         struct lttcomm_relayd_create_session_2_4 msg;
 131
 132         if (strlen(session_name) >= sizeof(msg.session_name)) {
 133                 ret = -1;
 134                 goto error;
 135         }
 136         strncpy(msg.session_name, session_name, sizeof(msg.session_name));
 137         if (strlen(hostname) >= sizeof(msg.hostname)) {
 138                 ret = -1;
 139                 goto error;
 140         }
 141         strncpy(msg.hostname, hostname, sizeof(msg.hostname));
 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                 if (strlen(channel_name) >= sizeof(msg.channel_name)) {
 259                         ret = -1;
 260                         goto error;
 261                 }
 262                 strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name));
 263                 if (strlen(pathname) >= sizeof(msg.pathname)) {
 264                         ret = -1;
 265                         goto error;
 266                 }
 267                 strncpy(msg.pathname, pathname, sizeof(msg.pathname));
 268
 269                 /* Send command */
 270                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 271                 if (ret < 0) {
 272                         goto error;
 273                 }
 274         } else {
 275                 memset(&msg_2_2, 0, sizeof(msg_2_2));
 276                 /* Compat with relayd 2.2+ */
 277                 if (strlen(channel_name) >= sizeof(msg_2_2.channel_name)) {
 278                         ret = -1;
 279                         goto error;
 280                 }
 281                 strncpy(msg_2_2.channel_name, channel_name, sizeof(msg_2_2.channel_name));
 282                 if (strlen(pathname) >= sizeof(msg_2_2.pathname)) {
 283                         ret = -1;
 284                         goto error;
 285                 }
 286                 strncpy(msg_2_2.pathname, pathname, sizeof(msg_2_2.pathname));
 287                 msg_2_2.tracefile_size = htobe64(tracefile_size);
 288                 msg_2_2.tracefile_count = htobe64(tracefile_count);
 289
 290                 /* Send command */
 291                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg_2_2, sizeof(msg_2_2), 0);
 292                 if (ret < 0) {
 293                         goto error;
 294                 }
 295         }
 296
 297         /* Waiting for reply */
 298         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 299         if (ret < 0) {
 300                 goto error;
 301         }
 302
 303         /* Back to host bytes order. */
 304         reply.handle = be64toh(reply.handle);
 305         reply.ret_code = be32toh(reply.ret_code);
 306
 307         /* Return session id or negative ret code. */
 308         if (reply.ret_code != LTTNG_OK) {
 309                 ret = -1;
 310                 ERR("Relayd add stream replied error %d", reply.ret_code);
 311         } else {
 312                 /* Success */
 313                 ret = 0;
 314                 *stream_id = reply.handle;
 315         }
 316
 317         DBG("Relayd stream added successfully with handle %" PRIu64,
 318                 reply.handle);
 319
 320 error:
 321         return ret;
 322 }
 323
 324 /*
 325  * Inform the relay that all the streams for the current channel has been sent.
 326  *
 327  * On success return 0 else return ret_code negative value.
 328  */
 329 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 330 {
 331         int ret;
 332         struct lttcomm_relayd_generic_reply reply;
 333
 334         /* Code flow error. Safety net. */
 335         assert(rsock);
 336
 337         DBG("Relayd sending streams sent.");
 338
 339         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 340         if (rsock->minor < 4) {
 341                 ret = 0;
 342                 goto end;
 343         }
 344
 345         /* Send command */
 346         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 347         if (ret < 0) {
 348                 goto error;
 349         }
 350
 351         /* Waiting for reply */
 352         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 353         if (ret < 0) {
 354                 goto error;
 355         }
 356
 357         /* Back to host bytes order. */
 358         reply.ret_code = be32toh(reply.ret_code);
 359
 360         /* Return session id or negative ret code. */
 361         if (reply.ret_code != LTTNG_OK) {
 362                 ret = -1;
 363                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 364                 goto error;
 365         } else {
 366                 /* Success */
 367                 ret = 0;
 368         }
 369
 370         DBG("Relayd streams sent success");
 371
 372 error:
 373 end:
 374         return ret;
 375 }
 376
 377 /*
 378  * Check version numbers on the relayd.
 379  * If major versions are compatible, we assign minor_to_use to the
 380  * minor version of the procotol we are going to use for this session.
 381  *
 382  * Return 0 if compatible else negative value.
 383  */
 384 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 385 {
 386         int ret;
 387         struct lttcomm_relayd_version msg;
 388
 389         /* Code flow error. Safety net. */
 390         assert(rsock);
 391
 392         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 393                         rsock->minor);
 394
 395         memset(&msg, 0, sizeof(msg));
 396         /* Prepare network byte order before transmission. */
 397         msg.major = htobe32(rsock->major);
 398         msg.minor = htobe32(rsock->minor);
 399
 400         /* Send command */
 401         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 402         if (ret < 0) {
 403                 goto error;
 404         }
 405
 406         /* Receive response */
 407         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 408         if (ret < 0) {
 409                 goto error;
 410         }
 411
 412         /* Set back to host bytes order */
 413         msg.major = be32toh(msg.major);
 414         msg.minor = be32toh(msg.minor);
 415
 416         /*
 417          * Only validate the major version. If the other side is higher,
 418          * communication is not possible. Only major version equal can talk to each
 419          * other. If the minor version differs, the lowest version is used by both
 420          * sides.
 421          */
 422         if (msg.major != rsock->major) {
 423                 /* Not compatible */
 424                 ret = -1;
 425                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 426                                 msg.major, rsock->major);
 427                 goto error;
 428         }
 429
 430         /*
 431          * If the relayd's minor version is higher, it will adapt to our version so
 432          * we can continue to use the latest relayd communication data structure.
 433          * If the received minor version is higher, the relayd should adapt to us.
 434          */
 435         if (rsock->minor > msg.minor) {
 436                 rsock->minor = msg.minor;
 437         }
 438
 439         /* Version number compatible */
 440         DBG2("Relayd version is compatible, using protocol version %u.%u",
 441                         rsock->major, rsock->minor);
 442         ret = 0;
 443
 444 error:
 445         return ret;
 446 }
 447
 448 /*
 449  * Add stream on the relayd and assign stream handle to the stream_id argument.
 450  *
 451  * On success return 0 else return ret_code negative value.
 452  */
 453 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 454 {
 455         int ret;
 456
 457         /* Code flow error. Safety net. */
 458         assert(rsock);
 459
 460         DBG("Relayd sending metadata of size %zu", len);
 461
 462         /* Send command */
 463         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 464         if (ret < 0) {
 465                 goto error;
 466         }
 467
 468         DBG2("Relayd metadata added successfully");
 469
 470         /*
 471          * After that call, the metadata data MUST be sent to the relayd so the
 472          * receive size on the other end matches the len of the metadata packet
 473          * header. This is why we don't wait for a reply here.
 474          */
 475
 476 error:
 477         return ret;
 478 }
 479
 480 /*
 481  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 482  */
 483 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 484 {
 485         /* Code flow error. Safety net. */
 486         assert(rsock);
 487
 488         if (!rsock->sock.ops) {
 489                 /*
 490                  * Attempting a connect on a non-initialized socket.
 491                  */
 492                 return -ECONNRESET;
 493         }
 494
 495         DBG3("Relayd connect ...");
 496
 497         return rsock->sock.ops->connect(&rsock->sock);
 498 }
 499
 500 /*
 501  * Close relayd socket with an allocated lttcomm_relayd_sock.
 502  *
 503  * If no socket operations are found, simply return 0 meaning that everything
 504  * is fine. Without operations, the socket can not possibly be opened or used.
 505  * This is possible if the socket was allocated but not created. However, the
 506  * caller could simply use it to store a valid file descriptor for instance
 507  * passed over a Unix socket and call this to cleanup but still without a valid
 508  * ops pointer.
 509  *
 510  * Return the close returned value. On error, a negative value is usually
 511  * returned back from close(2).
 512  */
 513 int relayd_close(struct lttcomm_relayd_sock *rsock)
 514 {
 515         int ret;
 516
 517         /* Code flow error. Safety net. */
 518         assert(rsock);
 519
 520         /* An invalid fd is fine, return success. */
 521         if (rsock->sock.fd < 0) {
 522                 ret = 0;
 523                 goto end;
 524         }
 525
 526         DBG3("Relayd closing socket %d", rsock->sock.fd);
 527
 528         if (rsock->sock.ops) {
 529                 ret = rsock->sock.ops->close(&rsock->sock);
 530         } else {
 531                 /* Default call if no specific ops found. */
 532                 ret = close(rsock->sock.fd);
 533                 if (ret < 0) {
 534                         PERROR("relayd_close default close");
 535                 }
 536         }
 537         rsock->sock.fd = -1;
 538
 539 end:
 540         return ret;
 541 }
 542
 543 /*
 544  * Send data header structure to the relayd.
 545  */
 546 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 547                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 548 {
 549         int ret;
 550
 551         /* Code flow error. Safety net. */
 552         assert(rsock);
 553         assert(hdr);
 554
 555         if (rsock->sock.fd < 0) {
 556                 return -ECONNRESET;
 557         }
 558
 559         DBG3("Relayd sending data header of size %zu", size);
 560
 561         /* Again, safety net */
 562         if (size == 0) {
 563                 size = sizeof(struct lttcomm_relayd_data_hdr);
 564         }
 565
 566         /* Only send data header. */
 567         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 568         if (ret < 0) {
 569                 ret = -errno;
 570                 goto error;
 571         }
 572
 573         /*
 574          * The data MUST be sent right after that command for the receive on the
 575          * other end to match the size in the header.
 576          */
 577
 578 error:
 579         return ret;
 580 }
 581
 582 /*
 583  * Send close stream command to the relayd.
 584  */
 585 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 586                 uint64_t last_net_seq_num)
 587 {
 588         int ret;
 589         struct lttcomm_relayd_close_stream msg;
 590         struct lttcomm_relayd_generic_reply reply;
 591
 592         /* Code flow error. Safety net. */
 593         assert(rsock);
 594
 595         DBG("Relayd closing stream id %" PRIu64, stream_id);
 596
 597         memset(&msg, 0, sizeof(msg));
 598         msg.stream_id = htobe64(stream_id);
 599         msg.last_net_seq_num = htobe64(last_net_seq_num);
 600
 601         /* Send command */
 602         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 603         if (ret < 0) {
 604                 goto error;
 605         }
 606
 607         /* Receive response */
 608         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 609         if (ret < 0) {
 610                 goto error;
 611         }
 612
 613         reply.ret_code = be32toh(reply.ret_code);
 614
 615         /* Return session id or negative ret code. */
 616         if (reply.ret_code != LTTNG_OK) {
 617                 ret = -1;
 618                 ERR("Relayd close stream replied error %d", reply.ret_code);
 619         } else {
 620                 /* Success */
 621                 ret = 0;
 622         }
 623
 624         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 625
 626 error:
 627         return ret;
 628 }
 629
 630 /*
 631  * Check for data availability for a given stream id.
 632  *
 633  * Return 0 if NOT pending, 1 if so and a negative value on error.
 634  */
 635 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 636                 uint64_t last_net_seq_num)
 637 {
 638         int ret;
 639         struct lttcomm_relayd_data_pending msg;
 640         struct lttcomm_relayd_generic_reply reply;
 641
 642         /* Code flow error. Safety net. */
 643         assert(rsock);
 644
 645         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 646
 647         memset(&msg, 0, sizeof(msg));
 648         msg.stream_id = htobe64(stream_id);
 649         msg.last_net_seq_num = htobe64(last_net_seq_num);
 650
 651         /* Send command */
 652         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 653                         sizeof(msg), 0);
 654         if (ret < 0) {
 655                 goto error;
 656         }
 657
 658         /* Receive response */
 659         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 660         if (ret < 0) {
 661                 goto error;
 662         }
 663
 664         reply.ret_code = be32toh(reply.ret_code);
 665
 666         /* Return session id or negative ret code. */
 667         if (reply.ret_code >= LTTNG_OK) {
 668                 ERR("Relayd data pending replied error %d", reply.ret_code);
 669         }
 670
 671         /* At this point, the ret code is either 1 or 0 */
 672         ret = reply.ret_code;
 673
 674         DBG("Relayd data is %s pending for stream id %" PRIu64,
 675                         ret == 1 ? "" : "NOT", stream_id);
 676
 677 error:
 678         return ret;
 679 }
 680
 681 /*
 682  * Check on the relayd side for a quiescent state on the control socket.
 683  */
 684 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 685                 uint64_t metadata_stream_id)
 686 {
 687         int ret;
 688         struct lttcomm_relayd_quiescent_control msg;
 689         struct lttcomm_relayd_generic_reply reply;
 690
 691         /* Code flow error. Safety net. */
 692         assert(rsock);
 693
 694         DBG("Relayd checking quiescent control state");
 695
 696         memset(&msg, 0, sizeof(msg));
 697         msg.stream_id = htobe64(metadata_stream_id);
 698
 699         /* Send command */
 700         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 701         if (ret < 0) {
 702                 goto error;
 703         }
 704
 705         /* Receive response */
 706         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 707         if (ret < 0) {
 708                 goto error;
 709         }
 710
 711         reply.ret_code = be32toh(reply.ret_code);
 712
 713         /* Return session id or negative ret code. */
 714         if (reply.ret_code != LTTNG_OK) {
 715                 ret = -1;
 716                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 717                 goto error;
 718         }
 719
 720         /* Control socket is quiescent */
 721         return 0;
 722
 723 error:
 724         return ret;
 725 }
 726
 727 /*
 728  * Begin a data pending command for a specific session id.
 729  */
 730 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 731 {
 732         int ret;
 733         struct lttcomm_relayd_begin_data_pending msg;
 734         struct lttcomm_relayd_generic_reply reply;
 735
 736         /* Code flow error. Safety net. */
 737         assert(rsock);
 738
 739         DBG("Relayd begin data pending");
 740
 741         memset(&msg, 0, sizeof(msg));
 742         msg.session_id = htobe64(id);
 743
 744         /* Send command */
 745         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
 746         if (ret < 0) {
 747                 goto error;
 748         }
 749
 750         /* Receive response */
 751         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 752         if (ret < 0) {
 753                 goto error;
 754         }
 755
 756         reply.ret_code = be32toh(reply.ret_code);
 757
 758         /* Return session id or negative ret code. */
 759         if (reply.ret_code != LTTNG_OK) {
 760                 ret = -1;
 761                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
 762                 goto error;
 763         }
 764
 765         return 0;
 766
 767 error:
 768         return ret;
 769 }
 770
 771 /*
 772  * End a data pending command for a specific session id.
 773  *
 774  * Return 0 on success and set is_data_inflight to 0 if no data is being
 775  * streamed or 1 if it is the case.
 776  */
 777 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
 778                 unsigned int *is_data_inflight)
 779 {
 780         int ret, recv_ret;
 781         struct lttcomm_relayd_end_data_pending msg;
 782         struct lttcomm_relayd_generic_reply reply;
 783
 784         /* Code flow error. Safety net. */
 785         assert(rsock);
 786
 787         DBG("Relayd end data pending");
 788
 789         memset(&msg, 0, sizeof(msg));
 790         msg.session_id = htobe64(id);
 791
 792         /* Send command */
 793         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
 794         if (ret < 0) {
 795                 goto error;
 796         }
 797
 798         /* Receive response */
 799         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 800         if (ret < 0) {
 801                 goto error;
 802         }
 803
 804         recv_ret = be32toh(reply.ret_code);
 805         if (recv_ret < 0) {
 806                 ret = recv_ret;
 807                 goto error;
 808         }
 809
 810         *is_data_inflight = recv_ret;
 811
 812         DBG("Relayd end data pending is data inflight: %d", recv_ret);
 813
 814         return 0;
 815
 816 error:
 817         return ret;
 818 }
 819
 820 /*
 821  * Send index to the relayd.
 822  */
 823 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
 824                 struct ctf_packet_index *index, uint64_t relay_stream_id,
 825                 uint64_t net_seq_num)
 826 {
 827         int ret;
 828         struct lttcomm_relayd_index msg;
 829         struct lttcomm_relayd_generic_reply reply;
 830
 831         /* Code flow error. Safety net. */
 832         assert(rsock);
 833
 834         if (rsock->minor < 4) {
 835                 DBG("Not sending indexes before protocol 2.4");
 836                 ret = 0;
 837                 goto error;
 838         }
 839
 840         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
 841
 842         memset(&msg, 0, sizeof(msg));
 843         msg.relay_stream_id = htobe64(relay_stream_id);
 844         msg.net_seq_num = htobe64(net_seq_num);
 845
 846         /* The index is already in big endian. */
 847         msg.packet_size = index->packet_size;
 848         msg.content_size = index->content_size;
 849         msg.timestamp_begin = index->timestamp_begin;
 850         msg.timestamp_end = index->timestamp_end;
 851         msg.events_discarded = index->events_discarded;
 852         msg.stream_id = index->stream_id;
 853
 854         if (rsock->minor >= 8) {
 855                 msg.stream_instance_id = index->stream_instance_id;
 856                 msg.packet_seq_num = index->packet_seq_num;
 857         }
 858
 859         /* Send command */
 860         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg, sizeof(msg), 0);
 861         if (ret < 0) {
 862                 goto error;
 863         }
 864
 865         /* Receive response */
 866         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 867         if (ret < 0) {
 868                 goto error;
 869         }
 870
 871         reply.ret_code = be32toh(reply.ret_code);
 872
 873         /* Return session id or negative ret code. */
 874         if (reply.ret_code != LTTNG_OK) {
 875                 ret = -1;
 876                 ERR("Relayd send index replied error %d", reply.ret_code);
 877         } else {
 878                 /* Success */
 879                 ret = 0;
 880         }
 881
 882 error:
 883         return ret;
 884 }
 885
 886 /*
 887  * Ask the relay to reset the metadata trace file (regeneration).
 888  */
 889 int relayd_reset_metadata(struct lttcomm_relayd_sock *rsock,
 890                 uint64_t stream_id, uint64_t version)
 891 {
 892         int ret;
 893         struct lttcomm_relayd_reset_metadata msg;
 894         struct lttcomm_relayd_generic_reply reply;
 895
 896         /* Code flow error. Safety net. */
 897         assert(rsock);
 898
 899         /* Should have been prevented by the sessiond. */
 900         if (rsock->minor < 8) {
 901                 ERR("Metadata regeneration unsupported before 2.8");
 902                 ret = -1;
 903                 goto error;
 904         }
 905
 906         DBG("Relayd reset metadata stream id %" PRIu64, stream_id);
 907
 908         memset(&msg, 0, sizeof(msg));
 909         msg.stream_id = htobe64(stream_id);
 910         msg.version = htobe64(version);
 911
 912         /* Send command */
 913         ret = send_command(rsock, RELAYD_RESET_METADATA, (void *) &msg, sizeof(msg), 0);
 914         if (ret < 0) {
 915                 goto error;
 916         }
 917
 918         /* Receive response */
 919         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 920         if (ret < 0) {
 921                 goto error;
 922         }
 923
 924         reply.ret_code = be32toh(reply.ret_code);
 925
 926         /* Return session id or negative ret code. */
 927         if (reply.ret_code != LTTNG_OK) {
 928                 ret = -1;
 929                 ERR("Relayd reset metadata replied error %d", reply.ret_code);
 930         } else {
 931                 /* Success */
 932                 ret = 0;
 933         }
 934
 935         DBG("Relayd reset metadata stream id %" PRIu64 " successfully", stream_id);
 936
 937 error:
 938         return ret;
 939 }