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
 503         /* Code flow error. Safety net. */
 504         assert(rsock);
 505         assert(channel_name);
 506         assert(domain_name);
 507         assert(_pathname);
 508         assert(trace_chunk);
 509
 510         DBG("Relayd adding stream for channel name %s", channel_name);
 511
 512         /* Compat with relayd 2.1 */
 513         if (rsock->minor == 1) {
 514                 /* For 2.1 */
 515                 ret = relayd_add_stream_2_1(rsock, channel_name, _pathname);
 516
 517         } else if (rsock->minor > 1 && rsock->minor < 11) {
 518                 /* From 2.2 to 2.10 */
 519                 ret = relayd_add_stream_2_2(rsock, channel_name, _pathname,
 520                                 tracefile_size, tracefile_count);
 521         } else {
 522                 const char *separator;
 523                 enum lttng_trace_chunk_status chunk_status;
 524                 uint64_t chunk_id;
 525
 526                 if (_pathname[0] == '\0') {
 527                         separator = "";
 528                 } else {
 529                         separator = "/";
 530                 }
 531
 532                 ret = snprintf(pathname, RELAYD_COMM_LTTNG_PATH_MAX, "%s%s%s",
 533                                 domain_name, separator, _pathname);
 534                 if (ret <= 0 || ret >= RELAYD_COMM_LTTNG_PATH_MAX) {
 535                         ERR("Failed to format stream path: %s",
 536                                         ret <= 0 ? "formatting error" :
 537                                                         "path exceeds maximal allowed length");
 538                         ret = -1;
 539                         goto error;
 540                 }
 541
 542                 chunk_status = lttng_trace_chunk_get_id(trace_chunk,
 543                                 &chunk_id);
 544                 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
 545
 546                 /* From 2.11 to ...*/
 547                 ret = relayd_add_stream_2_11(rsock, channel_name, pathname,
 548                                 tracefile_size, tracefile_count,
 549                                 chunk_id);
 550         }
 551
 552         if (ret) {
 553                 ret = -1;
 554                 goto error;
 555         }
 556
 557         /* Waiting for reply */
 558         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 559         if (ret < 0) {
 560                 goto error;
 561         }
 562
 563         /* Back to host bytes order. */
 564         reply.handle = be64toh(reply.handle);
 565         reply.ret_code = be32toh(reply.ret_code);
 566
 567         /* Return session id or negative ret code. */
 568         if (reply.ret_code != LTTNG_OK) {
 569                 ret = -1;
 570                 ERR("Relayd add stream replied error %d", reply.ret_code);
 571         } else {
 572                 /* Success */
 573                 ret = 0;
 574                 *stream_id = reply.handle;
 575         }
 576
 577         DBG("Relayd stream added successfully with handle %" PRIu64,
 578                         reply.handle);
 579
 580 error:
 581         return ret;
 582 }
 583
 584 /*
 585  * Inform the relay that all the streams for the current channel has been sent.
 586  *
 587  * On success return 0 else return ret_code negative value.
 588  */
 589 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 590 {
 591         int ret;
 592         struct lttcomm_relayd_generic_reply reply;
 593
 594         /* Code flow error. Safety net. */
 595         assert(rsock);
 596
 597         DBG("Relayd sending streams sent.");
 598
 599         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 600         if (rsock->minor < 4) {
 601                 ret = 0;
 602                 goto end;
 603         }
 604
 605         /* Send command */
 606         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 607         if (ret < 0) {
 608                 goto error;
 609         }
 610
 611         /* Waiting for reply */
 612         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 613         if (ret < 0) {
 614                 goto error;
 615         }
 616
 617         /* Back to host bytes order. */
 618         reply.ret_code = be32toh(reply.ret_code);
 619
 620         /* Return session id or negative ret code. */
 621         if (reply.ret_code != LTTNG_OK) {
 622                 ret = -1;
 623                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 624                 goto error;
 625         } else {
 626                 /* Success */
 627                 ret = 0;
 628         }
 629
 630         DBG("Relayd streams sent success");
 631
 632 error:
 633 end:
 634         return ret;
 635 }
 636
 637 /*
 638  * Check version numbers on the relayd.
 639  * If major versions are compatible, we assign minor_to_use to the
 640  * minor version of the procotol we are going to use for this session.
 641  *
 642  * Return 0 if the two daemons are compatible, LTTNG_ERR_RELAYD_VERSION_FAIL
 643  * otherwise, or a negative value on network errors.
 644  */
 645 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 646 {
 647         int ret;
 648         struct lttcomm_relayd_version msg;
 649
 650         /* Code flow error. Safety net. */
 651         assert(rsock);
 652
 653         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 654                         rsock->minor);
 655
 656         memset(&msg, 0, sizeof(msg));
 657         /* Prepare network byte order before transmission. */
 658         msg.major = htobe32(rsock->major);
 659         msg.minor = htobe32(rsock->minor);
 660
 661         /* Send command */
 662         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 663         if (ret < 0) {
 664                 goto error;
 665         }
 666
 667         /* Receive response */
 668         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 669         if (ret < 0) {
 670                 goto error;
 671         }
 672
 673         /* Set back to host bytes order */
 674         msg.major = be32toh(msg.major);
 675         msg.minor = be32toh(msg.minor);
 676
 677         /*
 678          * Only validate the major version. If the other side is higher,
 679          * communication is not possible. Only major version equal can talk to each
 680          * other. If the minor version differs, the lowest version is used by both
 681          * sides.
 682          */
 683         if (msg.major != rsock->major) {
 684                 /* Not compatible */
 685                 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
 686                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 687                                 msg.major, rsock->major);
 688                 goto error;
 689         }
 690
 691         /*
 692          * If the relayd's minor version is higher, it will adapt to our version so
 693          * we can continue to use the latest relayd communication data structure.
 694          * If the received minor version is higher, the relayd should adapt to us.
 695          */
 696         if (rsock->minor > msg.minor) {
 697                 rsock->minor = msg.minor;
 698         }
 699
 700         /* Version number compatible */
 701         DBG2("Relayd version is compatible, using protocol version %u.%u",
 702                         rsock->major, rsock->minor);
 703         ret = 0;
 704
 705 error:
 706         return ret;
 707 }
 708
 709 /*
 710  * Add stream on the relayd and assign stream handle to the stream_id argument.
 711  *
 712  * On success return 0 else return ret_code negative value.
 713  */
 714 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 715 {
 716         int ret;
 717
 718         /* Code flow error. Safety net. */
 719         assert(rsock);
 720
 721         DBG("Relayd sending metadata of size %zu", len);
 722
 723         /* Send command */
 724         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 725         if (ret < 0) {
 726                 goto error;
 727         }
 728
 729         DBG2("Relayd metadata added successfully");
 730
 731         /*
 732          * After that call, the metadata data MUST be sent to the relayd so the
 733          * receive size on the other end matches the len of the metadata packet
 734          * header. This is why we don't wait for a reply here.
 735          */
 736
 737 error:
 738         return ret;
 739 }
 740
 741 /*
 742  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 743  */
 744 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 745 {
 746         /* Code flow error. Safety net. */
 747         assert(rsock);
 748
 749         if (!rsock->sock.ops) {
 750                 /*
 751                  * Attempting a connect on a non-initialized socket.
 752                  */
 753                 return -ECONNRESET;
 754         }
 755
 756         DBG3("Relayd connect ...");
 757
 758         return rsock->sock.ops->connect(&rsock->sock);
 759 }
 760
 761 /*
 762  * Close relayd socket with an allocated lttcomm_relayd_sock.
 763  *
 764  * If no socket operations are found, simply return 0 meaning that everything
 765  * is fine. Without operations, the socket can not possibly be opened or used.
 766  * This is possible if the socket was allocated but not created. However, the
 767  * caller could simply use it to store a valid file descriptor for instance
 768  * passed over a Unix socket and call this to cleanup but still without a valid
 769  * ops pointer.
 770  *
 771  * Return the close returned value. On error, a negative value is usually
 772  * returned back from close(2).
 773  */
 774 int relayd_close(struct lttcomm_relayd_sock *rsock)
 775 {
 776         int ret;
 777
 778         /* Code flow error. Safety net. */
 779         assert(rsock);
 780
 781         /* An invalid fd is fine, return success. */
 782         if (rsock->sock.fd < 0) {
 783                 ret = 0;
 784                 goto end;
 785         }
 786
 787         DBG3("Relayd closing socket %d", rsock->sock.fd);
 788
 789         if (rsock->sock.ops) {
 790                 ret = rsock->sock.ops->close(&rsock->sock);
 791         } else {
 792                 /* Default call if no specific ops found. */
 793                 ret = close(rsock->sock.fd);
 794                 if (ret < 0) {
 795                         PERROR("relayd_close default close");
 796                 }
 797         }
 798         rsock->sock.fd = -1;
 799
 800 end:
 801         return ret;
 802 }
 803
 804 /*
 805  * Send data header structure to the relayd.
 806  */
 807 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 808                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 809 {
 810         int ret;
 811
 812         /* Code flow error. Safety net. */
 813         assert(rsock);
 814         assert(hdr);
 815
 816         if (rsock->sock.fd < 0) {
 817                 return -ECONNRESET;
 818         }
 819
 820         DBG3("Relayd sending data header of size %zu", size);
 821
 822         /* Again, safety net */
 823         if (size == 0) {
 824                 size = sizeof(struct lttcomm_relayd_data_hdr);
 825         }
 826
 827         /* Only send data header. */
 828         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 829         if (ret < 0) {
 830                 ret = -errno;
 831                 goto error;
 832         }
 833
 834         /*
 835          * The data MUST be sent right after that command for the receive on the
 836          * other end to match the size in the header.
 837          */
 838
 839 error:
 840         return ret;
 841 }
 842
 843 /*
 844  * Send close stream command to the relayd.
 845  */
 846 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 847                 uint64_t last_net_seq_num)
 848 {
 849         int ret;
 850         struct lttcomm_relayd_close_stream msg;
 851         struct lttcomm_relayd_generic_reply reply;
 852
 853         /* Code flow error. Safety net. */
 854         assert(rsock);
 855
 856         DBG("Relayd closing stream id %" PRIu64, stream_id);
 857
 858         memset(&msg, 0, sizeof(msg));
 859         msg.stream_id = htobe64(stream_id);
 860         msg.last_net_seq_num = htobe64(last_net_seq_num);
 861
 862         /* Send command */
 863         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 864         if (ret < 0) {
 865                 goto error;
 866         }
 867
 868         /* Receive response */
 869         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 870         if (ret < 0) {
 871                 goto error;
 872         }
 873
 874         reply.ret_code = be32toh(reply.ret_code);
 875
 876         /* Return session id or negative ret code. */
 877         if (reply.ret_code != LTTNG_OK) {
 878                 ret = -1;
 879                 ERR("Relayd close stream replied error %d", reply.ret_code);
 880         } else {
 881                 /* Success */
 882                 ret = 0;
 883         }
 884
 885         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 886
 887 error:
 888         return ret;
 889 }
 890
 891 /*
 892  * Check for data availability for a given stream id.
 893  *
 894  * Return 0 if NOT pending, 1 if so and a negative value on error.
 895  */
 896 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 897                 uint64_t last_net_seq_num)
 898 {
 899         int ret;
 900         struct lttcomm_relayd_data_pending msg;
 901         struct lttcomm_relayd_generic_reply reply;
 902
 903         /* Code flow error. Safety net. */
 904         assert(rsock);
 905
 906         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 907
 908         memset(&msg, 0, sizeof(msg));
 909         msg.stream_id = htobe64(stream_id);
 910         msg.last_net_seq_num = htobe64(last_net_seq_num);
 911
 912         /* Send command */
 913         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 914                         sizeof(msg), 0);
 915         if (ret < 0) {
 916                 goto error;
 917         }
 918
 919         /* Receive response */
 920         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 921         if (ret < 0) {
 922                 goto error;
 923         }
 924
 925         reply.ret_code = be32toh(reply.ret_code);
 926
 927         /* Return session id or negative ret code. */
 928         if (reply.ret_code >= LTTNG_OK) {
 929                 ERR("Relayd data pending replied error %d", reply.ret_code);
 930         }
 931
 932         /* At this point, the ret code is either 1 or 0 */
 933         ret = reply.ret_code;
 934
 935         DBG("Relayd data is %s pending for stream id %" PRIu64,
 936                         ret == 1 ? "" : "NOT", stream_id);
 937
 938 error:
 939         return ret;
 940 }
 941
 942 /*
 943  * Check on the relayd side for a quiescent state on the control socket.
 944  */
 945 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 946                 uint64_t metadata_stream_id)
 947 {
 948         int ret;
 949         struct lttcomm_relayd_quiescent_control msg;
 950         struct lttcomm_relayd_generic_reply reply;
 951
 952         /* Code flow error. Safety net. */
 953         assert(rsock);
 954
 955         DBG("Relayd checking quiescent control state");
 956
 957         memset(&msg, 0, sizeof(msg));
 958         msg.stream_id = htobe64(metadata_stream_id);
 959
 960         /* Send command */
 961         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 962         if (ret < 0) {
 963                 goto error;
 964         }
 965
 966         /* Receive response */
 967         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 968         if (ret < 0) {
 969                 goto error;
 970         }
 971
 972         reply.ret_code = be32toh(reply.ret_code);
 973
 974         /* Return session id or negative ret code. */
 975         if (reply.ret_code != LTTNG_OK) {
 976                 ret = -1;
 977                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 978                 goto error;
 979         }
 980
 981         /* Control socket is quiescent */
 982         return 0;
 983
 984 error:
 985         return ret;
 986 }
 987
 988 /*
 989  * Begin a data pending command for a specific session id.
 990  */
 991 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 992 {
 993         int ret;
 994         struct lttcomm_relayd_begin_data_pending msg;
 995         struct lttcomm_relayd_generic_reply reply;
 996
 997         /* Code flow error. Safety net. */
 998         assert(rsock);
 999
1000         DBG("Relayd begin data pending");
1001
1002         memset(&msg, 0, sizeof(msg));
1003         msg.session_id = htobe64(id);
1004
1005         /* Send command */
1006         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
1007         if (ret < 0) {
1008                 goto error;
1009         }
1010
1011         /* Receive response */
1012         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1013         if (ret < 0) {
1014                 goto error;
1015         }
1016
1017         reply.ret_code = be32toh(reply.ret_code);
1018
1019         /* Return session id or negative ret code. */
1020         if (reply.ret_code != LTTNG_OK) {
1021                 ret = -1;
1022                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
1023                 goto error;
1024         }
1025
1026         return 0;
1027
1028 error:
1029         return ret;
1030 }
1031
1032 /*
1033  * End a data pending command for a specific session id.
1034  *
1035  * Return 0 on success and set is_data_inflight to 0 if no data is being
1036  * streamed or 1 if it is the case.
1037  */
1038 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
1039                 unsigned int *is_data_inflight)
1040 {
1041         int ret, recv_ret;
1042         struct lttcomm_relayd_end_data_pending msg;
1043         struct lttcomm_relayd_generic_reply reply;
1044
1045         /* Code flow error. Safety net. */
1046         assert(rsock);
1047
1048         DBG("Relayd end data pending");
1049
1050         memset(&msg, 0, sizeof(msg));
1051         msg.session_id = htobe64(id);
1052
1053         /* Send command */
1054         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
1055         if (ret < 0) {
1056                 goto error;
1057         }
1058
1059         /* Receive response */
1060         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1061         if (ret < 0) {
1062                 goto error;
1063         }
1064
1065         recv_ret = be32toh(reply.ret_code);
1066         if (recv_ret < 0) {
1067                 ret = recv_ret;
1068                 goto error;
1069         }
1070
1071         *is_data_inflight = recv_ret;
1072
1073         DBG("Relayd end data pending is data inflight: %d", recv_ret);
1074
1075         return 0;
1076
1077 error:
1078         return ret;
1079 }
1080
1081 /*
1082  * Send index to the relayd.
1083  */
1084 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
1085                 struct ctf_packet_index *index, uint64_t relay_stream_id,
1086                 uint64_t net_seq_num)
1087 {
1088         int ret;
1089         struct lttcomm_relayd_index msg;
1090         struct lttcomm_relayd_generic_reply reply;
1091
1092         /* Code flow error. Safety net. */
1093         assert(rsock);
1094
1095         if (rsock->minor < 4) {
1096                 DBG("Not sending indexes before protocol 2.4");
1097                 ret = 0;
1098                 goto error;
1099         }
1100
1101         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
1102
1103         memset(&msg, 0, sizeof(msg));
1104         msg.relay_stream_id = htobe64(relay_stream_id);
1105         msg.net_seq_num = htobe64(net_seq_num);
1106
1107         /* The index is already in big endian. */
1108         msg.packet_size = index->packet_size;
1109         msg.content_size = index->content_size;
1110         msg.timestamp_begin = index->timestamp_begin;
1111         msg.timestamp_end = index->timestamp_end;
1112         msg.events_discarded = index->events_discarded;
1113         msg.stream_id = index->stream_id;
1114
1115         if (rsock->minor >= 8) {
1116                 msg.stream_instance_id = index->stream_instance_id;
1117                 msg.packet_seq_num = index->packet_seq_num;
1118         }
1119
1120         /* Send command */
1121         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg,
1122                 lttcomm_relayd_index_len(lttng_to_index_major(rsock->major,
1123                                                                 rsock->minor),
1124                                 lttng_to_index_minor(rsock->major, rsock->minor)),
1125                                 0);
1126         if (ret < 0) {
1127                 goto error;
1128         }
1129
1130         /* Receive response */
1131         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1132         if (ret < 0) {
1133                 goto error;
1134         }
1135
1136         reply.ret_code = be32toh(reply.ret_code);
1137
1138         /* Return session id or negative ret code. */
1139         if (reply.ret_code != LTTNG_OK) {
1140                 ret = -1;
1141                 ERR("Relayd send index replied error %d", reply.ret_code);
1142         } else {
1143                 /* Success */
1144                 ret = 0;
1145         }
1146
1147 error:
1148         return ret;
1149 }
1150
1151 /*
1152  * Ask the relay to reset the metadata trace file (regeneration).
1153  */
1154 int relayd_reset_metadata(struct lttcomm_relayd_sock *rsock,
1155                 uint64_t stream_id, uint64_t version)
1156 {
1157         int ret;
1158         struct lttcomm_relayd_reset_metadata msg;
1159         struct lttcomm_relayd_generic_reply reply;
1160
1161         /* Code flow error. Safety net. */
1162         assert(rsock);
1163
1164         /* Should have been prevented by the sessiond. */
1165         if (rsock->minor < 8) {
1166                 ERR("Metadata regeneration unsupported before 2.8");
1167                 ret = -1;
1168                 goto error;
1169         }
1170
1171         DBG("Relayd reset metadata stream id %" PRIu64, stream_id);
1172
1173         memset(&msg, 0, sizeof(msg));
1174         msg.stream_id = htobe64(stream_id);
1175         msg.version = htobe64(version);
1176
1177         /* Send command */
1178         ret = send_command(rsock, RELAYD_RESET_METADATA, (void *) &msg, sizeof(msg), 0);
1179         if (ret < 0) {
1180                 goto error;
1181         }
1182
1183         /* Receive response */
1184         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1185         if (ret < 0) {
1186                 goto error;
1187         }
1188
1189         reply.ret_code = be32toh(reply.ret_code);
1190
1191         /* Return session id or negative ret code. */
1192         if (reply.ret_code != LTTNG_OK) {
1193                 ret = -1;
1194                 ERR("Relayd reset metadata replied error %d", reply.ret_code);
1195         } else {
1196                 /* Success */
1197                 ret = 0;
1198         }
1199
1200         DBG("Relayd reset metadata stream id %" PRIu64 " successfully", stream_id);
1201
1202 error:
1203         return ret;
1204 }
1205
1206 int relayd_rotate_streams(struct lttcomm_relayd_sock *sock,
1207                 unsigned int stream_count, const uint64_t *new_chunk_id,
1208                 const struct relayd_stream_rotation_position *positions)
1209 {
1210         int ret;
1211         unsigned int i;
1212         struct lttng_dynamic_buffer payload;
1213         struct lttcomm_relayd_generic_reply reply = {};
1214         const struct lttcomm_relayd_rotate_streams msg = {
1215                 .stream_count = htobe32((uint32_t) stream_count),
1216                 .new_chunk_id = (typeof(msg.new_chunk_id)) {
1217                         .is_set = !!new_chunk_id,
1218                         .value = htobe64(new_chunk_id ? *new_chunk_id : 0),
1219                 },
1220         };
1221         char new_chunk_id_buf[MAX_INT_DEC_LEN(*new_chunk_id)] = {};
1222         const char *new_chunk_id_str;
1223
1224         if (!relayd_supports_chunks(sock)) {
1225                 DBG("Refusing to rotate remote streams: relayd does not support chunks");
1226                 return 0;
1227         }
1228
1229         lttng_dynamic_buffer_init(&payload);
1230
1231         /* Code flow error. Safety net. */
1232         assert(sock);
1233
1234         if (new_chunk_id) {
1235                 ret = snprintf(new_chunk_id_buf, sizeof(new_chunk_id_buf),
1236                                 "%" PRIu64, *new_chunk_id);
1237                 if (ret == -1 || ret >= sizeof(new_chunk_id_buf)) {
1238                         new_chunk_id_str = "formatting error";
1239                 } else {
1240                         new_chunk_id_str = new_chunk_id_buf;
1241                 }
1242         } else {
1243                 new_chunk_id_str = "none";
1244         }
1245
1246         DBG("Preparing \"rotate streams\" command payload: new_chunk_id = %s, stream_count = %u",
1247                         new_chunk_id_str, stream_count);
1248
1249         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1250         if (ret) {
1251                 ERR("Failed to allocate \"rotate streams\" command payload");
1252                 goto error;
1253         }
1254
1255         for (i = 0; i < stream_count; i++) {
1256                 const struct relayd_stream_rotation_position *position =
1257                                 &positions[i];
1258                 const struct lttcomm_relayd_stream_rotation_position comm_position = {
1259                         .stream_id = htobe64(position->stream_id),
1260                         .rotate_at_seq_num = htobe64(
1261                                         position->rotate_at_seq_num),
1262                 };
1263
1264                 DBG("Rotate stream %" PRIu64 " at sequence number %" PRIu64,
1265                                 position->stream_id,
1266                                 position->rotate_at_seq_num);
1267                 ret = lttng_dynamic_buffer_append(&payload, &comm_position,
1268                                 sizeof(comm_position));
1269                 if (ret) {
1270                         ERR("Failed to allocate \"rotate streams\" command payload");
1271                         goto error;
1272                 }
1273         }
1274
1275         /* Send command. */
1276         ret = send_command(sock, RELAYD_ROTATE_STREAMS, payload.data,
1277                         payload.size, 0);
1278         if (ret < 0) {
1279                 ERR("Failed to send \"rotate stream\" command");
1280                 goto error;
1281         }
1282
1283         /* Receive response. */
1284         ret = recv_reply(sock, &reply, sizeof(reply));
1285         if (ret < 0) {
1286                 ERR("Failed to receive \"rotate streams\" command reply");
1287                 goto error;
1288         }
1289
1290         reply.ret_code = be32toh(reply.ret_code);
1291         if (reply.ret_code != LTTNG_OK) {
1292                 ret = -1;
1293                 ERR("Relayd rotate streams replied error %d", reply.ret_code);
1294         } else {
1295                 /* Success. */
1296                 ret = 0;
1297                 DBG("Relayd rotated streams successfully");
1298         }
1299
1300 error:
1301         lttng_dynamic_buffer_reset(&payload);
1302         return ret;
1303 }
1304
1305 int relayd_create_trace_chunk(struct lttcomm_relayd_sock *sock,
1306                 struct lttng_trace_chunk *chunk)
1307 {
1308         int ret = 0;
1309         enum lttng_trace_chunk_status status;
1310         struct lttcomm_relayd_create_trace_chunk msg = {};
1311         struct lttcomm_relayd_generic_reply reply = {};
1312         struct lttng_dynamic_buffer payload;
1313         uint64_t chunk_id;
1314         time_t creation_timestamp;
1315         const char *chunk_name;
1316         size_t chunk_name_length;
1317         bool overridden_name;
1318
1319         lttng_dynamic_buffer_init(&payload);
1320
1321         if (!relayd_supports_chunks(sock)) {
1322                 DBG("Refusing to create remote trace chunk: relayd does not support chunks");
1323                 goto end;
1324         }
1325
1326         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1327         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1328                 ret = -1;
1329                 goto end;
1330         }
1331
1332         status = lttng_trace_chunk_get_creation_timestamp(
1333                         chunk, &creation_timestamp);
1334         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1335                 ret = -1;
1336                 goto end;
1337         }
1338
1339         status = lttng_trace_chunk_get_name(
1340                         chunk, &chunk_name, &overridden_name);
1341         if (status != LTTNG_TRACE_CHUNK_STATUS_OK &&
1342                         status != LTTNG_TRACE_CHUNK_STATUS_NONE) {
1343                 ret = -1;
1344                 goto end;
1345         }
1346
1347         chunk_name_length = overridden_name ? (strlen(chunk_name) + 1) : 0;
1348         msg = (typeof(msg)){
1349                 .chunk_id = htobe64(chunk_id),
1350                 .creation_timestamp = htobe64((uint64_t) creation_timestamp),
1351                 .override_name_length = htobe32((uint32_t) chunk_name_length),
1352         };
1353
1354         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1355         if (ret) {
1356                 goto end;
1357         }
1358         if (chunk_name_length) {
1359                 ret = lttng_dynamic_buffer_append(
1360                                 &payload, chunk_name, chunk_name_length);
1361                 if (ret) {
1362                         goto end;
1363                 }
1364         }
1365
1366         ret = send_command(sock, RELAYD_CREATE_TRACE_CHUNK, payload.data,
1367                         payload.size, 0);
1368         if (ret < 0) {
1369                 ERR("Failed to send trace chunk creation command to relay daemon");
1370                 goto end;
1371         }
1372
1373         ret = recv_reply(sock, &reply, sizeof(reply));
1374         if (ret < 0) {
1375                 ERR("Failed to receive relay daemon trace chunk creation command reply");
1376                 goto end;
1377         }
1378
1379         reply.ret_code = be32toh(reply.ret_code);
1380         if (reply.ret_code != LTTNG_OK) {
1381                 ret = -1;
1382                 ERR("Relayd trace chunk create replied error %d",
1383                                 reply.ret_code);
1384         } else {
1385                 ret = 0;
1386                 DBG("Relayd successfully created trace chunk: chunk_id = %" PRIu64,
1387                                 chunk_id);
1388         }
1389
1390 end:
1391         lttng_dynamic_buffer_reset(&payload);
1392         return ret;
1393 }
1394
1395 int relayd_close_trace_chunk(struct lttcomm_relayd_sock *sock,
1396                 struct lttng_trace_chunk *chunk,
1397                 char *path)
1398 {
1399         int ret = 0;
1400         enum lttng_trace_chunk_status status;
1401         struct lttcomm_relayd_close_trace_chunk msg = {};
1402         struct lttcomm_relayd_close_trace_chunk_reply reply = {};
1403         uint64_t chunk_id;
1404         time_t close_timestamp;
1405         LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command = {};
1406
1407         if (!relayd_supports_chunks(sock)) {
1408                 DBG("Refusing to close remote trace chunk: relayd does not support chunks");
1409                 goto end;
1410         }
1411
1412         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1413         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1414                 ERR("Failed to get trace chunk id");
1415                 ret = -1;
1416                 goto end;
1417         }
1418
1419         status = lttng_trace_chunk_get_close_timestamp(chunk, &close_timestamp);
1420         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1421                 ERR("Failed to get trace chunk close timestamp");
1422                 ret = -1;
1423                 goto end;
1424         }
1425
1426         status = lttng_trace_chunk_get_close_command(chunk,
1427                         &close_command.value);
1428         switch (status) {
1429         case LTTNG_TRACE_CHUNK_STATUS_OK:
1430                 close_command.is_set = 1;
1431                 break;
1432         case LTTNG_TRACE_CHUNK_STATUS_NONE:
1433                 break;
1434         default:
1435                 ERR("Failed to get trace chunk close command");
1436                 ret = -1;
1437                 goto end;
1438         }
1439
1440         msg = (typeof(msg)){
1441                 .chunk_id = htobe64(chunk_id),
1442                 .close_timestamp = htobe64((uint64_t) close_timestamp),
1443                 .close_command = {
1444                         .value = htobe32((uint32_t) close_command.value),
1445                         .is_set = close_command.is_set,
1446                 },
1447         };
1448
1449         ret = send_command(sock, RELAYD_CLOSE_TRACE_CHUNK, &msg, sizeof(msg),
1450                         0);
1451         if (ret < 0) {
1452                 ERR("Failed to send trace chunk close command to relay daemon");
1453                 goto end;
1454         }
1455
1456         ret = recv_reply(sock, &reply, sizeof(reply));
1457         if (ret < 0) {
1458                 ERR("Failed to receive relay daemon trace chunk close command reply");
1459                 goto end;
1460         }
1461
1462         reply.path_length = be32toh(reply.path_length);
1463         if (reply.path_length >= LTTNG_PATH_MAX) {
1464                 ERR("Chunk path too long");
1465                 ret = -1;
1466                 goto end;
1467         }
1468
1469         ret = recv_reply(sock, path, reply.path_length);
1470         if (ret < 0) {
1471                 ERR("Failed to receive relay daemon trace chunk close command reply");
1472                 goto end;
1473         }
1474         if (path[reply.path_length - 1] != '\0') {
1475                 ERR("Invalid trace chunk path returned by relay daemon (not null-terminated)");
1476                 ret = -1;
1477                 goto end;
1478         }
1479
1480         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1481         if (reply.generic.ret_code != LTTNG_OK) {
1482                 ret = -1;
1483                 ERR("Relayd trace chunk close replied error %d",
1484                                 reply.generic.ret_code);
1485         } else {
1486                 ret = 0;
1487                 DBG("Relayd successfully closed trace chunk: chunk_id = %" PRIu64,
1488                                 chunk_id);
1489         }
1490 end:
1491         return ret;
1492 }
1493
1494 int relayd_trace_chunk_exists(struct lttcomm_relayd_sock *sock,
1495                 uint64_t chunk_id, bool *chunk_exists)
1496 {
1497         int ret = 0;
1498         struct lttcomm_relayd_trace_chunk_exists msg = {};
1499         struct lttcomm_relayd_trace_chunk_exists_reply reply = {};
1500
1501         if (!relayd_supports_chunks(sock)) {
1502                 DBG("Refusing to check for trace chunk existence: relayd does not support chunks");
1503                 /* The chunk will never exist */
1504                 *chunk_exists = false;
1505                 goto end;
1506         }
1507
1508         msg = (typeof(msg)){
1509                         .chunk_id = htobe64(chunk_id),
1510         };
1511
1512         ret = send_command(sock, RELAYD_TRACE_CHUNK_EXISTS, &msg, sizeof(msg),
1513                         0);
1514         if (ret < 0) {
1515                 ERR("Failed to send trace chunk exists command to relay daemon");
1516                 goto end;
1517         }
1518
1519         ret = recv_reply(sock, &reply, sizeof(reply));
1520         if (ret < 0) {
1521                 ERR("Failed to receive relay daemon trace chunk close command reply");
1522                 goto end;
1523         }
1524
1525         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1526         if (reply.generic.ret_code != LTTNG_OK) {
1527                 ret = -1;
1528                 ERR("Relayd trace chunk close replied error %d",
1529                                 reply.generic.ret_code);
1530         } else {
1531                 ret = 0;
1532                 DBG("Relayd successfully checked trace chunk existence: chunk_id = %" PRIu64
1533                                 ", exists = %s", chunk_id,
1534                                 reply.trace_chunk_exists ? "true" : "false");
1535                 *chunk_exists = !!reply.trace_chunk_exists;
1536         }
1537 end:
1538         return ret;
1539 }
1540
1541 int relayd_get_configuration(struct lttcomm_relayd_sock *sock,
1542                 uint64_t query_flags,
1543                 uint64_t *result_flags)
1544 {
1545         int ret = 0;
1546         struct lttcomm_relayd_get_configuration msg = (typeof(msg)) {
1547                 .query_flags = htobe64(query_flags),
1548         };
1549         struct lttcomm_relayd_get_configuration_reply reply = {};
1550
1551         if (!relayd_supports_get_configuration(sock)) {
1552                 DBG("Refusing to get relayd configuration (unsupported by relayd)");
1553                 if (query_flags) {
1554                         ret = -1;
1555                         goto end;
1556                 }
1557                 *result_flags = 0;
1558                 goto end;
1559         }
1560
1561         ret = send_command(sock, RELAYD_GET_CONFIGURATION, &msg, sizeof(msg),
1562                         0);
1563         if (ret < 0) {
1564                 ERR("Failed to send get configuration command to relay daemon");
1565                 goto end;
1566         }
1567
1568         ret = recv_reply(sock, &reply, sizeof(reply));
1569         if (ret < 0) {
1570                 ERR("Failed to receive relay daemon get configuration command reply");
1571                 goto end;
1572         }
1573
1574         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1575         if (reply.generic.ret_code != LTTNG_OK) {
1576                 ret = -1;
1577                 ERR("Relayd get configuration replied error %d",
1578                                 reply.generic.ret_code);
1579         } else {
1580                 reply.relayd_configuration_flags =
1581                         be64toh(reply.relayd_configuration_flags);
1582                 ret = 0;
1583                 DBG("Relayd successfully got configuration: query_flags = %" PRIu64
1584                                 ", results_flags = %" PRIu64, query_flags,
1585                                 reply.relayd_configuration_flags);
1586                 *result_flags = reply.relayd_configuration_flags;
1587         }
1588 end:
1589         return ret;
1590 }