src/common/relayd/relayd.c

   1 /*
   2  * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #define _LGPL_SOURCE
   9 #include <assert.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <sys/stat.h>
  14 #include <inttypes.h>
  15
  16 #include <common/common.h>
  17 #include <common/defaults.h>
  18 #include <common/compat/endian.h>
  19 #include <common/compat/string.h>
  20 #include <common/sessiond-comm/relayd.h>
  21 #include <common/index/ctf-index.h>
  22 #include <common/trace-chunk.h>
  23 #include <common/string-utils/format.h>
  24
  25 #include "relayd.h"
  26
  27 static
  28 bool relayd_supports_chunks(const struct lttcomm_relayd_sock *sock)
  29 {
  30         if (sock->major > 2) {
  31                 return true;
  32         } else if (sock->major == 2 && sock->minor >= 11) {
  33                 return true;
  34         }
  35         return false;
  36 }
  37
  38 static
  39 bool relayd_supports_get_configuration(const struct lttcomm_relayd_sock *sock)
  40 {
  41         if (sock->major > 2) {
  42                 return true;
  43         } else if (sock->major == 2 && sock->minor >= 12) {
  44                 return true;
  45         }
  46         return false;
  47 }
  48
  49 /*
  50  * Send command. Fill up the header and append the data.
  51  */
  52 static int send_command(struct lttcomm_relayd_sock *rsock,
  53                 enum lttcomm_relayd_command cmd, const void *data, size_t size,
  54                 int flags)
  55 {
  56         int ret;
  57         struct lttcomm_relayd_hdr header;
  58         char *buf;
  59         uint64_t buf_size = sizeof(header);
  60
  61         if (rsock->sock.fd < 0) {
  62                 return -ECONNRESET;
  63         }
  64
  65         if (data) {
  66                 buf_size += size;
  67         }
  68
  69         buf = zmalloc(buf_size);
  70         if (buf == NULL) {
  71                 PERROR("zmalloc relayd send command buf");
  72                 ret = -1;
  73                 goto alloc_error;
  74         }
  75
  76         memset(&header, 0, sizeof(header));
  77         header.cmd = htobe32(cmd);
  78         header.data_size = htobe64(size);
  79
  80         /* Zeroed for now since not used. */
  81         header.cmd_version = 0;
  82         header.circuit_id = 0;
  83
  84         /* Prepare buffer to send. */
  85         memcpy(buf, &header, sizeof(header));
  86         if (data) {
  87                 memcpy(buf + sizeof(header), data, size);
  88         }
  89
  90         DBG3("Relayd sending command %d of size %" PRIu64, (int) cmd, buf_size);
  91         ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  92         if (ret < 0) {
  93                 PERROR("Failed to send command %d of size %" PRIu64,
  94                                 (int) cmd, buf_size);
  95                 ret = -errno;
  96                 goto error;
  97         }
  98 error:
  99         free(buf);
 100 alloc_error:
 101         return ret;
 102 }
 103
 104 /*
 105  * Receive reply data on socket. This MUST be call after send_command or else
 106  * could result in unexpected behavior(s).
 107  */
 108 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
 109 {
 110         int ret;
 111
 112         if (rsock->sock.fd < 0) {
 113                 return -ECONNRESET;
 114         }
 115
 116         DBG3("Relayd waiting for reply of size %zu", size);
 117
 118         ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
 119         if (ret <= 0 || ret != size) {
 120                 if (ret == 0) {
 121                         /* Orderly shutdown. */
 122                         DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
 123                 } else {
 124                         DBG("Receiving reply failed on sock %d for size %zu with ret %d",
 125                                         rsock->sock.fd, size, ret);
 126                 }
 127                 /* Always return -1 here and the caller can use errno. */
 128                 ret = -1;
 129                 goto error;
 130         }
 131
 132 error:
 133         return ret;
 134 }
 135
 136 /*
 137  * Starting from 2.11, RELAYD_CREATE_SESSION payload (session_name,
 138  * hostname, and base_path) have no length restriction on the sender side.
 139  * Length for both payloads is stored in the msg struct. A new dynamic size
 140  * payload size is introduced.
 141  */
 142 static int relayd_create_session_2_11(struct lttcomm_relayd_sock *rsock,
 143                 const char *session_name, const char *hostname,
 144                 const char *base_path, int session_live_timer,
 145                 unsigned int snapshot, uint64_t sessiond_session_id,
 146                 const lttng_uuid sessiond_uuid, const uint64_t *current_chunk_id,
 147                 time_t creation_time, bool session_name_contains_creation_time,
 148                 struct lttcomm_relayd_create_session_reply_2_11 *reply,
 149                 char *output_path)
 150 {
 151         int ret;
 152         struct lttcomm_relayd_create_session_2_11 *msg = NULL;
 153         size_t session_name_len;
 154         size_t hostname_len;
 155         size_t base_path_len;
 156         size_t msg_length;
 157         char *dst;
 158
 159         if (!base_path) {
 160                 base_path = "";
 161         }
 162         /* The three names are sent with a '\0' delimiter between them. */
 163         session_name_len = strlen(session_name) + 1;
 164         hostname_len = strlen(hostname) + 1;
 165         base_path_len = strlen(base_path) + 1;
 166
 167         msg_length = sizeof(*msg) + session_name_len + hostname_len + base_path_len;
 168         msg = zmalloc(msg_length);
 169         if (!msg) {
 170                 PERROR("zmalloc create_session_2_11 command message");
 171                 ret = -1;
 172                 goto error;
 173         }
 174
 175         assert(session_name_len <= UINT32_MAX);
 176         msg->session_name_len = htobe32(session_name_len);
 177
 178         assert(hostname_len <= UINT32_MAX);
 179         msg->hostname_len = htobe32(hostname_len);
 180
 181         assert(base_path_len <= UINT32_MAX);
 182         msg->base_path_len = htobe32(base_path_len);
 183
 184         dst = msg->names;
 185         if (lttng_strncpy(dst, session_name, session_name_len)) {
 186                 ret = -1;
 187                 goto error;
 188         }
 189         dst += session_name_len;
 190         if (lttng_strncpy(dst, hostname, hostname_len)) {
 191                 ret = -1;
 192                 goto error;
 193         }
 194         dst += hostname_len;
 195         if (lttng_strncpy(dst, base_path, base_path_len)) {
 196                 ret = -1;
 197                 goto error;
 198         }
 199
 200         msg->live_timer = htobe32(session_live_timer);
 201         msg->snapshot = !!snapshot;
 202
 203         lttng_uuid_copy(msg->sessiond_uuid, sessiond_uuid);
 204         msg->session_id = htobe64(sessiond_session_id);
 205         msg->session_name_contains_creation_time = session_name_contains_creation_time;
 206         if (current_chunk_id) {
 207                 LTTNG_OPTIONAL_SET(&msg->current_chunk_id,
 208                                 htobe64(*current_chunk_id));
 209         }
 210
 211         msg->creation_time = htobe64((uint64_t) creation_time);
 212
 213         /* Send command */
 214         ret = send_command(rsock, RELAYD_CREATE_SESSION, msg, msg_length, 0);
 215         if (ret < 0) {
 216                 goto error;
 217         }
 218         /* Receive response */
 219         ret = recv_reply(rsock, reply, sizeof(*reply));
 220         if (ret < 0) {
 221                 goto error;
 222         }
 223         reply->generic.session_id = be64toh(reply->generic.session_id);
 224         reply->generic.ret_code = be32toh(reply->generic.ret_code);
 225         reply->output_path_length = be32toh(reply->output_path_length);
 226         if (reply->output_path_length >= LTTNG_PATH_MAX) {
 227                 ERR("Invalid session output path length in reply (%" PRIu32 " bytes) exceeds maximal allowed length (%d bytes)",
 228                                 reply->output_path_length, LTTNG_PATH_MAX);
 229                 ret = -1;
 230                 goto error;
 231         }
 232         ret = recv_reply(rsock, output_path, reply->output_path_length);
 233         if (ret < 0) {
 234                 goto error;
 235         }
 236 error:
 237         free(msg);
 238         return ret;
 239 }
 240 /*
 241  * From 2.4 to 2.10, RELAYD_CREATE_SESSION takes additional parameters to
 242  * support the live reading capability.
 243  */
 244 static int relayd_create_session_2_4(struct lttcomm_relayd_sock *rsock,
 245                 const char *session_name, const char *hostname,
 246                 int session_live_timer, unsigned int snapshot,
 247                 struct lttcomm_relayd_status_session *reply)
 248 {
 249         int ret;
 250         struct lttcomm_relayd_create_session_2_4 msg;
 251
 252         if (lttng_strncpy(msg.session_name, session_name,
 253                         sizeof(msg.session_name))) {
 254                 ret = -1;
 255                 goto error;
 256         }
 257         if (lttng_strncpy(msg.hostname, hostname, sizeof(msg.hostname))) {
 258                 ret = -1;
 259                 goto error;
 260         }
 261         msg.live_timer = htobe32(session_live_timer);
 262         msg.snapshot = htobe32(snapshot);
 263
 264         /* Send command */
 265         ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
 266         if (ret < 0) {
 267                 goto error;
 268         }
 269
 270         /* Receive response */
 271         ret = recv_reply(rsock, reply, sizeof(*reply));
 272         if (ret < 0) {
 273                 goto error;
 274         }
 275         reply->session_id = be64toh(reply->session_id);
 276         reply->ret_code = be32toh(reply->ret_code);
 277 error:
 278         return ret;
 279 }
 280
 281 /*
 282  * RELAYD_CREATE_SESSION from 2.1 to 2.3.
 283  */
 284 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock,
 285                 struct lttcomm_relayd_status_session *reply)
 286 {
 287         int ret;
 288
 289         /* Send command */
 290         ret = send_command(rsock, RELAYD_CREATE_SESSION, NULL, 0, 0);
 291         if (ret < 0) {
 292                 goto error;
 293         }
 294
 295         /* Receive response */
 296         ret = recv_reply(rsock, reply, sizeof(*reply));
 297         if (ret < 0) {
 298                 goto error;
 299         }
 300         reply->session_id = be64toh(reply->session_id);
 301         reply->ret_code = be32toh(reply->ret_code);
 302 error:
 303         return ret;
 304 }
 305
 306 /*
 307  * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
 308  * set session_id of the relayd if we have a successful reply from the relayd.
 309  *
 310  * On success, return 0 else a negative value which is either an errno error or
 311  * a lttng error code from the relayd.
 312  */
 313 int relayd_create_session(struct lttcomm_relayd_sock *rsock,
 314                 uint64_t *relayd_session_id,
 315                 const char *session_name, const char *hostname,
 316                 const char *base_path, int session_live_timer,
 317                 unsigned int snapshot, uint64_t sessiond_session_id,
 318                 const lttng_uuid sessiond_uuid,
 319                 const uint64_t *current_chunk_id,
 320                 time_t creation_time, bool session_name_contains_creation_time,
 321                 char *output_path)
 322 {
 323         int ret;
 324         struct lttcomm_relayd_create_session_reply_2_11 reply = {};
 325
 326         assert(rsock);
 327         assert(relayd_session_id);
 328
 329         DBG("Relayd create session");
 330
 331         if (rsock->minor < 4) {
 332                 /* From 2.1 to 2.3 */
 333                 ret = relayd_create_session_2_1(rsock, &reply.generic);
 334         } else if (rsock->minor >= 4 && rsock->minor < 11) {
 335                 /* From 2.4 to 2.10 */
 336                 ret = relayd_create_session_2_4(rsock, session_name,
 337                                 hostname, session_live_timer, snapshot,
 338                                 &reply.generic);
 339         } else {
 340                 /* From 2.11 to ... */
 341                 ret = relayd_create_session_2_11(rsock, session_name,
 342                                 hostname, base_path, session_live_timer, snapshot,
 343                                 sessiond_session_id, sessiond_uuid,
 344                                 current_chunk_id, creation_time,
 345                                 session_name_contains_creation_time,
 346                                 &reply, output_path);
 347         }
 348
 349         if (ret < 0) {
 350                 goto error;
 351         }
 352
 353         /* Return session id or negative ret code. */
 354         if (reply.generic.ret_code != LTTNG_OK) {
 355                 ret = -1;
 356                 ERR("Relayd create session replied error %d",
 357                         reply.generic.ret_code);
 358                 goto error;
 359         } else {
 360                 ret = 0;
 361                 *relayd_session_id = reply.generic.session_id;
 362         }
 363
 364         DBG("Relayd session created with id %" PRIu64, reply.generic.session_id);
 365
 366 error:
 367         return ret;
 368 }
 369
 370 static int relayd_add_stream_2_1(struct lttcomm_relayd_sock *rsock,
 371                 const char *channel_name, const char *pathname)
 372 {
 373         int ret;
 374         struct lttcomm_relayd_add_stream msg;
 375
 376         memset(&msg, 0, sizeof(msg));
 377         if (lttng_strncpy(msg.channel_name, channel_name,
 378                                 sizeof(msg.channel_name))) {
 379                 ret = -1;
 380                 goto error;
 381         }
 382
 383         if (lttng_strncpy(msg.pathname, pathname,
 384                                 sizeof(msg.pathname))) {
 385                 ret = -1;
 386                 goto error;
 387         }
 388
 389         /* Send command */
 390         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 391         if (ret < 0) {
 392                 ret = -1;
 393                 goto error;
 394         }
 395         ret = 0;
 396 error:
 397         return ret;
 398 }
 399
 400 static int relayd_add_stream_2_2(struct lttcomm_relayd_sock *rsock,
 401                 const char *channel_name, const char *pathname,
 402                 uint64_t tracefile_size, uint64_t tracefile_count)
 403 {
 404         int ret;
 405         struct lttcomm_relayd_add_stream_2_2 msg;
 406
 407         memset(&msg, 0, sizeof(msg));
 408         /* Compat with relayd 2.2 to 2.10 */
 409         if (lttng_strncpy(msg.channel_name, channel_name,
 410                                 sizeof(msg.channel_name))) {
 411                 ret = -1;
 412                 goto error;
 413         }
 414         if (lttng_strncpy(msg.pathname, pathname,
 415                                 sizeof(msg.pathname))) {
 416                 ret = -1;
 417                 goto error;
 418         }
 419         msg.tracefile_size = htobe64(tracefile_size);
 420         msg.tracefile_count = htobe64(tracefile_count);
 421
 422         /* Send command */
 423         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 424         if (ret < 0) {
 425                 goto error;
 426         }
 427         ret = 0;
 428 error:
 429         return ret;
 430 }
 431
 432 static int relayd_add_stream_2_11(struct lttcomm_relayd_sock *rsock,
 433                 const char *channel_name, const char *pathname,
 434                 uint64_t tracefile_size, uint64_t tracefile_count,
 435                 uint64_t trace_archive_id)
 436 {
 437         int ret;
 438         struct lttcomm_relayd_add_stream_2_11 *msg = NULL;
 439         size_t channel_name_len;
 440         size_t pathname_len;
 441         size_t msg_length;
 442
 443         /* The two names are sent with a '\0' delimiter between them. */
 444         channel_name_len = strlen(channel_name) + 1;
 445         pathname_len = strlen(pathname) + 1;
 446
 447         msg_length = sizeof(*msg) + channel_name_len + pathname_len;
 448         msg = zmalloc(msg_length);
 449         if (!msg) {
 450                 PERROR("zmalloc add_stream_2_11 command message");
 451                 ret = -1;
 452                 goto error;
 453         }
 454
 455         assert(channel_name_len <= UINT32_MAX);
 456         msg->channel_name_len = htobe32(channel_name_len);
 457
 458         assert(pathname_len <= UINT32_MAX);
 459         msg->pathname_len = htobe32(pathname_len);
 460
 461         if (lttng_strncpy(msg->names, channel_name, channel_name_len)) {
 462                 ret = -1;
 463                 goto error;
 464         }
 465         if (lttng_strncpy(msg->names + channel_name_len, pathname, pathname_len)) {
 466                 ret = -1;
 467                 goto error;
 468         }
 469
 470         msg->tracefile_size = htobe64(tracefile_size);
 471         msg->tracefile_count = htobe64(tracefile_count);
 472         msg->trace_chunk_id = htobe64(trace_archive_id);
 473
 474         /* Send command */
 475         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) msg, msg_length, 0);
 476         if (ret < 0) {
 477                 goto error;
 478         }
 479         ret = 0;
 480 error:
 481         free(msg);
 482         return ret;
 483 }
 484
 485 /*
 486  * Add stream on the relayd and assign stream handle to the stream_id argument.
 487  *
 488  * Chunks are not supported by relayd prior to 2.11, but are used to
 489  * internally between session daemon and consumer daemon to keep track
 490  * of the channel and stream output path.
 491  *
 492  * On success return 0 else return ret_code negative value.
 493  */
 494 int relayd_add_stream(struct lttcomm_relayd_sock *rsock, const char *channel_name,
 495                 const char *domain_name, const char *_pathname, uint64_t *stream_id,
 496                 uint64_t tracefile_size, uint64_t tracefile_count,
 497                 struct lttng_trace_chunk *trace_chunk)
 498 {
 499         int ret;
 500         struct lttcomm_relayd_status_stream reply;
 501         char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
 502         const char *separator;
 503
 504         /* Code flow error. Safety net. */
 505         assert(rsock);
 506         assert(channel_name);
 507         assert(domain_name);
 508         assert(_pathname);
 509         assert(trace_chunk);
 510
 511         DBG("Relayd adding stream for channel name %s", channel_name);
 512
 513         if (_pathname[0] == '\0') {
 514                 separator = "";
 515         } else {
 516                 separator = "/";
 517         }
 518         ret = snprintf(pathname, RELAYD_COMM_LTTNG_PATH_MAX, "%s%s%s",
 519                         domain_name, separator, _pathname);
 520         if (ret <= 0 || ret >= RELAYD_COMM_LTTNG_PATH_MAX) {
 521                 ERR("stream path too long.");
 522                 ret = -1;
 523                 goto error;
 524         }
 525
 526         /* Compat with relayd 2.1 */
 527         if (rsock->minor == 1) {
 528                 /* For 2.1 */
 529                 ret = relayd_add_stream_2_1(rsock, channel_name, pathname);
 530
 531         } else if (rsock->minor > 1 && rsock->minor < 11) {
 532                 /* From 2.2 to 2.10 */
 533                 ret = relayd_add_stream_2_2(rsock, channel_name, pathname,
 534                                 tracefile_size, tracefile_count);
 535         } else {
 536                 enum lttng_trace_chunk_status chunk_status;
 537                 uint64_t chunk_id;
 538
 539                 chunk_status = lttng_trace_chunk_get_id(trace_chunk,
 540                                 &chunk_id);
 541                 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
 542
 543                 /* From 2.11 to ...*/
 544                 ret = relayd_add_stream_2_11(rsock, channel_name, pathname,
 545                                 tracefile_size, tracefile_count,
 546                                 chunk_id);
 547         }
 548
 549         if (ret) {
 550                 ret = -1;
 551                 goto error;
 552         }
 553
 554         /* Waiting for reply */
 555         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 556         if (ret < 0) {
 557                 goto error;
 558         }
 559
 560         /* Back to host bytes order. */
 561         reply.handle = be64toh(reply.handle);
 562         reply.ret_code = be32toh(reply.ret_code);
 563
 564         /* Return session id or negative ret code. */
 565         if (reply.ret_code != LTTNG_OK) {
 566                 ret = -1;
 567                 ERR("Relayd add stream replied error %d", reply.ret_code);
 568         } else {
 569                 /* Success */
 570                 ret = 0;
 571                 *stream_id = reply.handle;
 572         }
 573
 574         DBG("Relayd stream added successfully with handle %" PRIu64,
 575                         reply.handle);
 576
 577 error:
 578         return ret;
 579 }
 580
 581 /*
 582  * Inform the relay that all the streams for the current channel has been sent.
 583  *
 584  * On success return 0 else return ret_code negative value.
 585  */
 586 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 587 {
 588         int ret;
 589         struct lttcomm_relayd_generic_reply reply;
 590
 591         /* Code flow error. Safety net. */
 592         assert(rsock);
 593
 594         DBG("Relayd sending streams sent.");
 595
 596         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 597         if (rsock->minor < 4) {
 598                 ret = 0;
 599                 goto end;
 600         }
 601
 602         /* Send command */
 603         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 604         if (ret < 0) {
 605                 goto error;
 606         }
 607
 608         /* Waiting for reply */
 609         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 610         if (ret < 0) {
 611                 goto error;
 612         }
 613
 614         /* Back to host bytes order. */
 615         reply.ret_code = be32toh(reply.ret_code);
 616
 617         /* Return session id or negative ret code. */
 618         if (reply.ret_code != LTTNG_OK) {
 619                 ret = -1;
 620                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 621                 goto error;
 622         } else {
 623                 /* Success */
 624                 ret = 0;
 625         }
 626
 627         DBG("Relayd streams sent success");
 628
 629 error:
 630 end:
 631         return ret;
 632 }
 633
 634 /*
 635  * Check version numbers on the relayd.
 636  * If major versions are compatible, we assign minor_to_use to the
 637  * minor version of the procotol we are going to use for this session.
 638  *
 639  * Return 0 if the two daemons are compatible, LTTNG_ERR_RELAYD_VERSION_FAIL
 640  * otherwise, or a negative value on network errors.
 641  */
 642 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 643 {
 644         int ret;
 645         struct lttcomm_relayd_version msg;
 646
 647         /* Code flow error. Safety net. */
 648         assert(rsock);
 649
 650         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 651                         rsock->minor);
 652
 653         memset(&msg, 0, sizeof(msg));
 654         /* Prepare network byte order before transmission. */
 655         msg.major = htobe32(rsock->major);
 656         msg.minor = htobe32(rsock->minor);
 657
 658         /* Send command */
 659         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 660         if (ret < 0) {
 661                 goto error;
 662         }
 663
 664         /* Receive response */
 665         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 666         if (ret < 0) {
 667                 goto error;
 668         }
 669
 670         /* Set back to host bytes order */
 671         msg.major = be32toh(msg.major);
 672         msg.minor = be32toh(msg.minor);
 673
 674         /*
 675          * Only validate the major version. If the other side is higher,
 676          * communication is not possible. Only major version equal can talk to each
 677          * other. If the minor version differs, the lowest version is used by both
 678          * sides.
 679          */
 680         if (msg.major != rsock->major) {
 681                 /* Not compatible */
 682                 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
 683                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 684                                 msg.major, rsock->major);
 685                 goto error;
 686         }
 687
 688         /*
 689          * If the relayd's minor version is higher, it will adapt to our version so
 690          * we can continue to use the latest relayd communication data structure.
 691          * If the received minor version is higher, the relayd should adapt to us.
 692          */
 693         if (rsock->minor > msg.minor) {
 694                 rsock->minor = msg.minor;
 695         }
 696
 697         /* Version number compatible */
 698         DBG2("Relayd version is compatible, using protocol version %u.%u",
 699                         rsock->major, rsock->minor);
 700         ret = 0;
 701
 702 error:
 703         return ret;
 704 }
 705
 706 /*
 707  * Add stream on the relayd and assign stream handle to the stream_id argument.
 708  *
 709  * On success return 0 else return ret_code negative value.
 710  */
 711 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 712 {
 713         int ret;
 714
 715         /* Code flow error. Safety net. */
 716         assert(rsock);
 717
 718         DBG("Relayd sending metadata of size %zu", len);
 719
 720         /* Send command */
 721         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 722         if (ret < 0) {
 723                 goto error;
 724         }
 725
 726         DBG2("Relayd metadata added successfully");
 727
 728         /*
 729          * After that call, the metadata data MUST be sent to the relayd so the
 730          * receive size on the other end matches the len of the metadata packet
 731          * header. This is why we don't wait for a reply here.
 732          */
 733
 734 error:
 735         return ret;
 736 }
 737
 738 /*
 739  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 740  */
 741 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 742 {
 743         /* Code flow error. Safety net. */
 744         assert(rsock);
 745
 746         if (!rsock->sock.ops) {
 747                 /*
 748                  * Attempting a connect on a non-initialized socket.
 749                  */
 750                 return -ECONNRESET;
 751         }
 752
 753         DBG3("Relayd connect ...");
 754
 755         return rsock->sock.ops->connect(&rsock->sock);
 756 }
 757
 758 /*
 759  * Close relayd socket with an allocated lttcomm_relayd_sock.
 760  *
 761  * If no socket operations are found, simply return 0 meaning that everything
 762  * is fine. Without operations, the socket can not possibly be opened or used.
 763  * This is possible if the socket was allocated but not created. However, the
 764  * caller could simply use it to store a valid file descriptor for instance
 765  * passed over a Unix socket and call this to cleanup but still without a valid
 766  * ops pointer.
 767  *
 768  * Return the close returned value. On error, a negative value is usually
 769  * returned back from close(2).
 770  */
 771 int relayd_close(struct lttcomm_relayd_sock *rsock)
 772 {
 773         int ret;
 774
 775         /* Code flow error. Safety net. */
 776         assert(rsock);
 777
 778         /* An invalid fd is fine, return success. */
 779         if (rsock->sock.fd < 0) {
 780                 ret = 0;
 781                 goto end;
 782         }
 783
 784         DBG3("Relayd closing socket %d", rsock->sock.fd);
 785
 786         if (rsock->sock.ops) {
 787                 ret = rsock->sock.ops->close(&rsock->sock);
 788         } else {
 789                 /* Default call if no specific ops found. */
 790                 ret = close(rsock->sock.fd);
 791                 if (ret < 0) {
 792                         PERROR("relayd_close default close");
 793                 }
 794         }
 795         rsock->sock.fd = -1;
 796
 797 end:
 798         return ret;
 799 }
 800
 801 /*
 802  * Send data header structure to the relayd.
 803  */
 804 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 805                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 806 {
 807         int ret;
 808
 809         /* Code flow error. Safety net. */
 810         assert(rsock);
 811         assert(hdr);
 812
 813         if (rsock->sock.fd < 0) {
 814                 return -ECONNRESET;
 815         }
 816
 817         DBG3("Relayd sending data header of size %zu", size);
 818
 819         /* Again, safety net */
 820         if (size == 0) {
 821                 size = sizeof(struct lttcomm_relayd_data_hdr);
 822         }
 823
 824         /* Only send data header. */
 825         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 826         if (ret < 0) {
 827                 ret = -errno;
 828                 goto error;
 829         }
 830
 831         /*
 832          * The data MUST be sent right after that command for the receive on the
 833          * other end to match the size in the header.
 834          */
 835
 836 error:
 837         return ret;
 838 }
 839
 840 /*
 841  * Send close stream command to the relayd.
 842  */
 843 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 844                 uint64_t last_net_seq_num)
 845 {
 846         int ret;
 847         struct lttcomm_relayd_close_stream msg;
 848         struct lttcomm_relayd_generic_reply reply;
 849
 850         /* Code flow error. Safety net. */
 851         assert(rsock);
 852
 853         DBG("Relayd closing stream id %" PRIu64, stream_id);
 854
 855         memset(&msg, 0, sizeof(msg));
 856         msg.stream_id = htobe64(stream_id);
 857         msg.last_net_seq_num = htobe64(last_net_seq_num);
 858
 859         /* Send command */
 860         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &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 close stream replied error %d", reply.ret_code);
 877         } else {
 878                 /* Success */
 879                 ret = 0;
 880         }
 881
 882         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 883
 884 error:
 885         return ret;
 886 }
 887
 888 /*
 889  * Check for data availability for a given stream id.
 890  *
 891  * Return 0 if NOT pending, 1 if so and a negative value on error.
 892  */
 893 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 894                 uint64_t last_net_seq_num)
 895 {
 896         int ret;
 897         struct lttcomm_relayd_data_pending msg;
 898         struct lttcomm_relayd_generic_reply reply;
 899
 900         /* Code flow error. Safety net. */
 901         assert(rsock);
 902
 903         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 904
 905         memset(&msg, 0, sizeof(msg));
 906         msg.stream_id = htobe64(stream_id);
 907         msg.last_net_seq_num = htobe64(last_net_seq_num);
 908
 909         /* Send command */
 910         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 911                         sizeof(msg), 0);
 912         if (ret < 0) {
 913                 goto error;
 914         }
 915
 916         /* Receive response */
 917         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 918         if (ret < 0) {
 919                 goto error;
 920         }
 921
 922         reply.ret_code = be32toh(reply.ret_code);
 923
 924         /* Return session id or negative ret code. */
 925         if (reply.ret_code >= LTTNG_OK) {
 926                 ERR("Relayd data pending replied error %d", reply.ret_code);
 927         }
 928
 929         /* At this point, the ret code is either 1 or 0 */
 930         ret = reply.ret_code;
 931
 932         DBG("Relayd data is %s pending for stream id %" PRIu64,
 933                         ret == 1 ? "" : "NOT", stream_id);
 934
 935 error:
 936         return ret;
 937 }
 938
 939 /*
 940  * Check on the relayd side for a quiescent state on the control socket.
 941  */
 942 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 943                 uint64_t metadata_stream_id)
 944 {
 945         int ret;
 946         struct lttcomm_relayd_quiescent_control msg;
 947         struct lttcomm_relayd_generic_reply reply;
 948
 949         /* Code flow error. Safety net. */
 950         assert(rsock);
 951
 952         DBG("Relayd checking quiescent control state");
 953
 954         memset(&msg, 0, sizeof(msg));
 955         msg.stream_id = htobe64(metadata_stream_id);
 956
 957         /* Send command */
 958         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 959         if (ret < 0) {
 960                 goto error;
 961         }
 962
 963         /* Receive response */
 964         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 965         if (ret < 0) {
 966                 goto error;
 967         }
 968
 969         reply.ret_code = be32toh(reply.ret_code);
 970
 971         /* Return session id or negative ret code. */
 972         if (reply.ret_code != LTTNG_OK) {
 973                 ret = -1;
 974                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 975                 goto error;
 976         }
 977
 978         /* Control socket is quiescent */
 979         return 0;
 980
 981 error:
 982         return ret;
 983 }
 984
 985 /*
 986  * Begin a data pending command for a specific session id.
 987  */
 988 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 989 {
 990         int ret;
 991         struct lttcomm_relayd_begin_data_pending msg;
 992         struct lttcomm_relayd_generic_reply reply;
 993
 994         /* Code flow error. Safety net. */
 995         assert(rsock);
 996
 997         DBG("Relayd begin data pending");
 998
 999         memset(&msg, 0, sizeof(msg));
1000         msg.session_id = htobe64(id);
1001
1002         /* Send command */
1003         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
1004         if (ret < 0) {
1005                 goto error;
1006         }
1007
1008         /* Receive response */
1009         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1010         if (ret < 0) {
1011                 goto error;
1012         }
1013
1014         reply.ret_code = be32toh(reply.ret_code);
1015
1016         /* Return session id or negative ret code. */
1017         if (reply.ret_code != LTTNG_OK) {
1018                 ret = -1;
1019                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
1020                 goto error;
1021         }
1022
1023         return 0;
1024
1025 error:
1026         return ret;
1027 }
1028
1029 /*
1030  * End a data pending command for a specific session id.
1031  *
1032  * Return 0 on success and set is_data_inflight to 0 if no data is being
1033  * streamed or 1 if it is the case.
1034  */
1035 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
1036                 unsigned int *is_data_inflight)
1037 {
1038         int ret, recv_ret;
1039         struct lttcomm_relayd_end_data_pending msg;
1040         struct lttcomm_relayd_generic_reply reply;
1041
1042         /* Code flow error. Safety net. */
1043         assert(rsock);
1044
1045         DBG("Relayd end data pending");
1046
1047         memset(&msg, 0, sizeof(msg));
1048         msg.session_id = htobe64(id);
1049
1050         /* Send command */
1051         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
1052         if (ret < 0) {
1053                 goto error;
1054         }
1055
1056         /* Receive response */
1057         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1058         if (ret < 0) {
1059                 goto error;
1060         }
1061
1062         recv_ret = be32toh(reply.ret_code);
1063         if (recv_ret < 0) {
1064                 ret = recv_ret;
1065                 goto error;
1066         }
1067
1068         *is_data_inflight = recv_ret;
1069
1070         DBG("Relayd end data pending is data inflight: %d", recv_ret);
1071
1072         return 0;
1073
1074 error:
1075         return ret;
1076 }
1077
1078 /*
1079  * Send index to the relayd.
1080  */
1081 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
1082                 struct ctf_packet_index *index, uint64_t relay_stream_id,
1083                 uint64_t net_seq_num)
1084 {
1085         int ret;
1086         struct lttcomm_relayd_index msg;
1087         struct lttcomm_relayd_generic_reply reply;
1088
1089         /* Code flow error. Safety net. */
1090         assert(rsock);
1091
1092         if (rsock->minor < 4) {
1093                 DBG("Not sending indexes before protocol 2.4");
1094                 ret = 0;
1095                 goto error;
1096         }
1097
1098         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
1099
1100         memset(&msg, 0, sizeof(msg));
1101         msg.relay_stream_id = htobe64(relay_stream_id);
1102         msg.net_seq_num = htobe64(net_seq_num);
1103
1104         /* The index is already in big endian. */
1105         msg.packet_size = index->packet_size;
1106         msg.content_size = index->content_size;
1107         msg.timestamp_begin = index->timestamp_begin;
1108         msg.timestamp_end = index->timestamp_end;
1109         msg.events_discarded = index->events_discarded;
1110         msg.stream_id = index->stream_id;
1111
1112         if (rsock->minor >= 8) {
1113                 msg.stream_instance_id = index->stream_instance_id;
1114                 msg.packet_seq_num = index->packet_seq_num;
1115         }
1116
1117         /* Send command */
1118         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg,
1119                 lttcomm_relayd_index_len(lttng_to_index_major(rsock->major,
1120                                                                 rsock->minor),
1121                                 lttng_to_index_minor(rsock->major, rsock->minor)),
1122                                 0);
1123         if (ret < 0) {
1124                 goto error;
1125         }
1126
1127         /* Receive response */
1128         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1129         if (ret < 0) {
1130                 goto error;
1131         }
1132
1133         reply.ret_code = be32toh(reply.ret_code);
1134
1135         /* Return session id or negative ret code. */
1136         if (reply.ret_code != LTTNG_OK) {
1137                 ret = -1;
1138                 ERR("Relayd send index replied error %d", reply.ret_code);
1139         } else {
1140                 /* Success */
1141                 ret = 0;
1142         }
1143
1144 error:
1145         return ret;
1146 }
1147
1148 /*
1149  * Ask the relay to reset the metadata trace file (regeneration).
1150  */
1151 int relayd_reset_metadata(struct lttcomm_relayd_sock *rsock,
1152                 uint64_t stream_id, uint64_t version)
1153 {
1154         int ret;
1155         struct lttcomm_relayd_reset_metadata msg;
1156         struct lttcomm_relayd_generic_reply reply;
1157
1158         /* Code flow error. Safety net. */
1159         assert(rsock);
1160
1161         /* Should have been prevented by the sessiond. */
1162         if (rsock->minor < 8) {
1163                 ERR("Metadata regeneration unsupported before 2.8");
1164                 ret = -1;
1165                 goto error;
1166         }
1167
1168         DBG("Relayd reset metadata stream id %" PRIu64, stream_id);
1169
1170         memset(&msg, 0, sizeof(msg));
1171         msg.stream_id = htobe64(stream_id);
1172         msg.version = htobe64(version);
1173
1174         /* Send command */
1175         ret = send_command(rsock, RELAYD_RESET_METADATA, (void *) &msg, sizeof(msg), 0);
1176         if (ret < 0) {
1177                 goto error;
1178         }
1179
1180         /* Receive response */
1181         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1182         if (ret < 0) {
1183                 goto error;
1184         }
1185
1186         reply.ret_code = be32toh(reply.ret_code);
1187
1188         /* Return session id or negative ret code. */
1189         if (reply.ret_code != LTTNG_OK) {
1190                 ret = -1;
1191                 ERR("Relayd reset metadata replied error %d", reply.ret_code);
1192         } else {
1193                 /* Success */
1194                 ret = 0;
1195         }
1196
1197         DBG("Relayd reset metadata stream id %" PRIu64 " successfully", stream_id);
1198
1199 error:
1200         return ret;
1201 }
1202
1203 int relayd_rotate_streams(struct lttcomm_relayd_sock *sock,
1204                 unsigned int stream_count, const uint64_t *new_chunk_id,
1205                 const struct relayd_stream_rotation_position *positions)
1206 {
1207         int ret;
1208         unsigned int i;
1209         struct lttng_dynamic_buffer payload;
1210         struct lttcomm_relayd_generic_reply reply = {};
1211         const struct lttcomm_relayd_rotate_streams msg = {
1212                 .stream_count = htobe32((uint32_t) stream_count),
1213                 .new_chunk_id = (typeof(msg.new_chunk_id)) {
1214                         .is_set = !!new_chunk_id,
1215                         .value = htobe64(new_chunk_id ? *new_chunk_id : 0),
1216                 },
1217         };
1218         char new_chunk_id_buf[MAX_INT_DEC_LEN(*new_chunk_id)] = {};
1219         const char *new_chunk_id_str;
1220
1221         if (!relayd_supports_chunks(sock)) {
1222                 DBG("Refusing to rotate remote streams: relayd does not support chunks");
1223                 return 0;
1224         }
1225
1226         lttng_dynamic_buffer_init(&payload);
1227
1228         /* Code flow error. Safety net. */
1229         assert(sock);
1230
1231         if (new_chunk_id) {
1232                 ret = snprintf(new_chunk_id_buf, sizeof(new_chunk_id_buf),
1233                                 "%" PRIu64, *new_chunk_id);
1234                 if (ret == -1 || ret >= sizeof(new_chunk_id_buf)) {
1235                         new_chunk_id_str = "formatting error";
1236                 } else {
1237                         new_chunk_id_str = new_chunk_id_buf;
1238                 }
1239         } else {
1240                 new_chunk_id_str = "none";
1241         }
1242
1243         DBG("Preparing \"rotate streams\" command payload: new_chunk_id = %s, stream_count = %u",
1244                         new_chunk_id_str, stream_count);
1245
1246         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1247         if (ret) {
1248                 ERR("Failed to allocate \"rotate streams\" command payload");
1249                 goto error;
1250         }
1251
1252         for (i = 0; i < stream_count; i++) {
1253                 const struct relayd_stream_rotation_position *position =
1254                                 &positions[i];
1255                 const struct lttcomm_relayd_stream_rotation_position comm_position = {
1256                         .stream_id = htobe64(position->stream_id),
1257                         .rotate_at_seq_num = htobe64(
1258                                         position->rotate_at_seq_num),
1259                 };
1260
1261                 DBG("Rotate stream %" PRIu64 "at sequence number %" PRIu64,
1262                                 position->stream_id,
1263                                 position->rotate_at_seq_num);
1264                 ret = lttng_dynamic_buffer_append(&payload, &comm_position,
1265                                 sizeof(comm_position));
1266                 if (ret) {
1267                         ERR("Failed to allocate \"rotate streams\" command payload");
1268                         goto error;
1269                 }
1270         }
1271
1272         /* Send command. */
1273         ret = send_command(sock, RELAYD_ROTATE_STREAMS, payload.data,
1274                         payload.size, 0);
1275         if (ret < 0) {
1276                 ERR("Failed to send \"rotate stream\" command");
1277                 goto error;
1278         }
1279
1280         /* Receive response. */
1281         ret = recv_reply(sock, &reply, sizeof(reply));
1282         if (ret < 0) {
1283                 ERR("Failed to receive \"rotate streams\" command reply");
1284                 goto error;
1285         }
1286
1287         reply.ret_code = be32toh(reply.ret_code);
1288         if (reply.ret_code != LTTNG_OK) {
1289                 ret = -1;
1290                 ERR("Relayd rotate streams replied error %d", reply.ret_code);
1291         } else {
1292                 /* Success. */
1293                 ret = 0;
1294                 DBG("Relayd rotated streams successfully");
1295         }
1296
1297 error:
1298         lttng_dynamic_buffer_reset(&payload);
1299         return ret;
1300 }
1301
1302 int relayd_create_trace_chunk(struct lttcomm_relayd_sock *sock,
1303                 struct lttng_trace_chunk *chunk)
1304 {
1305         int ret = 0;
1306         enum lttng_trace_chunk_status status;
1307         struct lttcomm_relayd_create_trace_chunk msg = {};
1308         struct lttcomm_relayd_generic_reply reply = {};
1309         struct lttng_dynamic_buffer payload;
1310         uint64_t chunk_id;
1311         time_t creation_timestamp;
1312         const char *chunk_name;
1313         size_t chunk_name_length;
1314         bool overridden_name;
1315
1316         lttng_dynamic_buffer_init(&payload);
1317
1318         if (!relayd_supports_chunks(sock)) {
1319                 DBG("Refusing to create remote trace chunk: relayd does not support chunks");
1320                 goto end;
1321         }
1322
1323         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1324         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1325                 ret = -1;
1326                 goto end;
1327         }
1328
1329         status = lttng_trace_chunk_get_creation_timestamp(
1330                         chunk, &creation_timestamp);
1331         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1332                 ret = -1;
1333                 goto end;
1334         }
1335
1336         status = lttng_trace_chunk_get_name(
1337                         chunk, &chunk_name, &overridden_name);
1338         if (status != LTTNG_TRACE_CHUNK_STATUS_OK &&
1339                         status != LTTNG_TRACE_CHUNK_STATUS_NONE) {
1340                 ret = -1;
1341                 goto end;
1342         }
1343
1344         chunk_name_length = overridden_name ? (strlen(chunk_name) + 1) : 0;
1345         msg = (typeof(msg)){
1346                 .chunk_id = htobe64(chunk_id),
1347                 .creation_timestamp = htobe64((uint64_t) creation_timestamp),
1348                 .override_name_length = htobe32((uint32_t) chunk_name_length),
1349         };
1350
1351         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1352         if (ret) {
1353                 goto end;
1354         }
1355         if (chunk_name_length) {
1356                 ret = lttng_dynamic_buffer_append(
1357                                 &payload, chunk_name, chunk_name_length);
1358                 if (ret) {
1359                         goto end;
1360                 }
1361         }
1362
1363         ret = send_command(sock, RELAYD_CREATE_TRACE_CHUNK, payload.data,
1364                         payload.size, 0);
1365         if (ret < 0) {
1366                 ERR("Failed to send trace chunk creation command to relay daemon");
1367                 goto end;
1368         }
1369
1370         ret = recv_reply(sock, &reply, sizeof(reply));
1371         if (ret < 0) {
1372                 ERR("Failed to receive relay daemon trace chunk creation command reply");
1373                 goto end;
1374         }
1375
1376         reply.ret_code = be32toh(reply.ret_code);
1377         if (reply.ret_code != LTTNG_OK) {
1378                 ret = -1;
1379                 ERR("Relayd trace chunk create replied error %d",
1380                                 reply.ret_code);
1381         } else {
1382                 ret = 0;
1383                 DBG("Relayd successfully created trace chunk: chunk_id = %" PRIu64,
1384                                 chunk_id);
1385         }
1386
1387 end:
1388         lttng_dynamic_buffer_reset(&payload);
1389         return ret;
1390 }
1391
1392 int relayd_close_trace_chunk(struct lttcomm_relayd_sock *sock,
1393                 struct lttng_trace_chunk *chunk,
1394                 char *path)
1395 {
1396         int ret = 0;
1397         enum lttng_trace_chunk_status status;
1398         struct lttcomm_relayd_close_trace_chunk msg = {};
1399         struct lttcomm_relayd_close_trace_chunk_reply reply = {};
1400         uint64_t chunk_id;
1401         time_t close_timestamp;
1402         LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command = {};
1403
1404         if (!relayd_supports_chunks(sock)) {
1405                 DBG("Refusing to close remote trace chunk: relayd does not support chunks");
1406                 goto end;
1407         }
1408
1409         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1410         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1411                 ERR("Failed to get trace chunk id");
1412                 ret = -1;
1413                 goto end;
1414         }
1415
1416         status = lttng_trace_chunk_get_close_timestamp(chunk, &close_timestamp);
1417         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1418                 ERR("Failed to get trace chunk close timestamp");
1419                 ret = -1;
1420                 goto end;
1421         }
1422
1423         status = lttng_trace_chunk_get_close_command(chunk,
1424                         &close_command.value);
1425         switch (status) {
1426         case LTTNG_TRACE_CHUNK_STATUS_OK:
1427                 close_command.is_set = 1;
1428                 break;
1429         case LTTNG_TRACE_CHUNK_STATUS_NONE:
1430                 break;
1431         default:
1432                 ERR("Failed to get trace chunk close command");
1433                 ret = -1;
1434                 goto end;
1435         }
1436
1437         msg = (typeof(msg)){
1438                 .chunk_id = htobe64(chunk_id),
1439                 .close_timestamp = htobe64((uint64_t) close_timestamp),
1440                 .close_command = {
1441                         .value = htobe32((uint32_t) close_command.value),
1442                         .is_set = close_command.is_set,
1443                 },
1444         };
1445
1446         ret = send_command(sock, RELAYD_CLOSE_TRACE_CHUNK, &msg, sizeof(msg),
1447                         0);
1448         if (ret < 0) {
1449                 ERR("Failed to send trace chunk close command to relay daemon");
1450                 goto end;
1451         }
1452
1453         ret = recv_reply(sock, &reply, sizeof(reply));
1454         if (ret < 0) {
1455                 ERR("Failed to receive relay daemon trace chunk close command reply");
1456                 goto end;
1457         }
1458
1459         reply.path_length = be32toh(reply.path_length);
1460         if (reply.path_length >= LTTNG_PATH_MAX) {
1461                 ERR("Chunk path too long");
1462                 ret = -1;
1463                 goto end;
1464         }
1465
1466         ret = recv_reply(sock, path, reply.path_length);
1467         if (ret < 0) {
1468                 ERR("Failed to receive relay daemon trace chunk close command reply");
1469                 goto end;
1470         }
1471         if (path[reply.path_length - 1] != '\0') {
1472                 ERR("Invalid trace chunk path returned by relay daemon (not null-terminated)");
1473                 ret = -1;
1474                 goto end;
1475         }
1476
1477         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1478         if (reply.generic.ret_code != LTTNG_OK) {
1479                 ret = -1;
1480                 ERR("Relayd trace chunk close replied error %d",
1481                                 reply.generic.ret_code);
1482         } else {
1483                 ret = 0;
1484                 DBG("Relayd successfully closed trace chunk: chunk_id = %" PRIu64,
1485                                 chunk_id);
1486         }
1487 end:
1488         return ret;
1489 }
1490
1491 int relayd_trace_chunk_exists(struct lttcomm_relayd_sock *sock,
1492                 uint64_t chunk_id, bool *chunk_exists)
1493 {
1494         int ret = 0;
1495         struct lttcomm_relayd_trace_chunk_exists msg = {};
1496         struct lttcomm_relayd_trace_chunk_exists_reply reply = {};
1497
1498         if (!relayd_supports_chunks(sock)) {
1499                 DBG("Refusing to check for trace chunk existence: relayd does not support chunks");
1500                 /* The chunk will never exist */
1501                 *chunk_exists = false;
1502                 goto end;
1503         }
1504
1505         msg = (typeof(msg)){
1506                         .chunk_id = htobe64(chunk_id),
1507         };
1508
1509         ret = send_command(sock, RELAYD_TRACE_CHUNK_EXISTS, &msg, sizeof(msg),
1510                         0);
1511         if (ret < 0) {
1512                 ERR("Failed to send trace chunk exists command to relay daemon");
1513                 goto end;
1514         }
1515
1516         ret = recv_reply(sock, &reply, sizeof(reply));
1517         if (ret < 0) {
1518                 ERR("Failed to receive relay daemon trace chunk close command reply");
1519                 goto end;
1520         }
1521
1522         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1523         if (reply.generic.ret_code != LTTNG_OK) {
1524                 ret = -1;
1525                 ERR("Relayd trace chunk close replied error %d",
1526                                 reply.generic.ret_code);
1527         } else {
1528                 ret = 0;
1529                 DBG("Relayd successfully checked trace chunk existence: chunk_id = %" PRIu64
1530                                 ", exists = %s", chunk_id,
1531                                 reply.trace_chunk_exists ? "true" : "false");
1532                 *chunk_exists = !!reply.trace_chunk_exists;
1533         }
1534 end:
1535         return ret;
1536 }
1537
1538 int relayd_get_configuration(struct lttcomm_relayd_sock *sock,
1539                 uint64_t query_flags,
1540                 uint64_t *result_flags)
1541 {
1542         int ret = 0;
1543         struct lttcomm_relayd_get_configuration msg = (typeof(msg)) {
1544                 .query_flags = htobe64(query_flags),
1545         };
1546         struct lttcomm_relayd_get_configuration_reply reply = {};
1547
1548         if (!relayd_supports_get_configuration(sock)) {
1549                 DBG("Refusing to get relayd configuration (unsupported by relayd)");
1550                 if (query_flags) {
1551                         ret = -1;
1552                         goto end;
1553                 }
1554                 *result_flags = 0;
1555                 goto end;
1556         }
1557
1558         ret = send_command(sock, RELAYD_GET_CONFIGURATION, &msg, sizeof(msg),
1559                         0);
1560         if (ret < 0) {
1561                 ERR("Failed to send get configuration command to relay daemon");
1562                 goto end;
1563         }
1564
1565         ret = recv_reply(sock, &reply, sizeof(reply));
1566         if (ret < 0) {
1567                 ERR("Failed to receive relay daemon get configuration command reply");
1568                 goto end;
1569         }
1570
1571         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1572         if (reply.generic.ret_code != LTTNG_OK) {
1573                 ret = -1;
1574                 ERR("Relayd get configuration replied error %d",
1575                                 reply.generic.ret_code);
1576         } else {
1577                 reply.relayd_configuration_flags =
1578                         be64toh(reply.relayd_configuration_flags);
1579                 ret = 0;
1580                 DBG("Relayd successfully got configuration: query_flags = %" PRIu64
1581                                 ", results_flags = %" PRIu64, query_flags,
1582                                 reply.relayd_configuration_flags);
1583                 *result_flags = reply.relayd_configuration_flags;
1584         }
1585 end:
1586         return ret;
1587 }