src/common/relayd/relayd.c

   1 /*
   2  * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <inttypes.h>
  25
  26 #include <common/common.h>
  27 #include <common/defaults.h>
  28 #include <common/compat/endian.h>
  29 #include <common/compat/string.h>
  30 #include <common/sessiond-comm/relayd.h>
  31 #include <common/index/ctf-index.h>
  32 #include <common/trace-chunk.h>
  33 #include <common/string-utils/format.h>
  34
  35 #include "relayd.h"
  36
  37 static
  38 bool relayd_supports_chunks(const struct lttcomm_relayd_sock *sock)
  39 {
  40         if (sock->major > 2) {
  41                 return true;
  42         } else if (sock->major == 2 && sock->minor >= 11) {
  43                 return true;
  44         }
  45         return false;
  46 }
  47
  48 /*
  49  * Send command. Fill up the header and append the data.
  50  */
  51 static int send_command(struct lttcomm_relayd_sock *rsock,
  52                 enum lttcomm_relayd_command cmd, const void *data, size_t size,
  53                 int flags)
  54 {
  55         int ret;
  56         struct lttcomm_relayd_hdr header;
  57         char *buf;
  58         uint64_t buf_size = sizeof(header);
  59
  60         if (rsock->sock.fd < 0) {
  61                 return -ECONNRESET;
  62         }
  63
  64         if (data) {
  65                 buf_size += size;
  66         }
  67
  68         buf = zmalloc(buf_size);
  69         if (buf == NULL) {
  70                 PERROR("zmalloc relayd send command buf");
  71                 ret = -1;
  72                 goto alloc_error;
  73         }
  74
  75         memset(&header, 0, sizeof(header));
  76         header.cmd = htobe32(cmd);
  77         header.data_size = htobe64(size);
  78
  79         /* Zeroed for now since not used. */
  80         header.cmd_version = 0;
  81         header.circuit_id = 0;
  82
  83         /* Prepare buffer to send. */
  84         memcpy(buf, &header, sizeof(header));
  85         if (data) {
  86                 memcpy(buf + sizeof(header), data, size);
  87         }
  88
  89         DBG3("Relayd sending command %d of size %" PRIu64, (int) cmd, buf_size);
  90         ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  91         if (ret < 0) {
  92                 PERROR("Failed to send command %d of size %" PRIu64,
  93                                 (int) cmd, buf_size);
  94                 ret = -errno;
  95                 goto error;
  96         }
  97 error:
  98         free(buf);
  99 alloc_error:
 100         return ret;
 101 }
 102
 103 /*
 104  * Receive reply data on socket. This MUST be call after send_command or else
 105  * could result in unexpected behavior(s).
 106  */
 107 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
 108 {
 109         int ret;
 110
 111         if (rsock->sock.fd < 0) {
 112                 return -ECONNRESET;
 113         }
 114
 115         DBG3("Relayd waiting for reply of size %zu", size);
 116
 117         ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
 118         if (ret <= 0 || ret != size) {
 119                 if (ret == 0) {
 120                         /* Orderly shutdown. */
 121                         DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
 122                 } else {
 123                         DBG("Receiving reply failed on sock %d for size %zu with ret %d",
 124                                         rsock->sock.fd, size, ret);
 125                 }
 126                 /* Always return -1 here and the caller can use errno. */
 127                 ret = -1;
 128                 goto error;
 129         }
 130
 131 error:
 132         return ret;
 133 }
 134
 135 /*
 136  * Starting from 2.11, RELAYD_CREATE_SESSION payload (session_name,
 137  * hostname, and base_path) have no length restriction on the sender side.
 138  * Length for both payloads is stored in the msg struct. A new dynamic size
 139  * payload size is introduced.
 140  */
 141 static int relayd_create_session_2_11(struct lttcomm_relayd_sock *rsock,
 142                 const char *session_name, const char *hostname,
 143                 const char *base_path, int session_live_timer,
 144                 unsigned int snapshot, uint64_t sessiond_session_id,
 145                 const lttng_uuid sessiond_uuid, const uint64_t *current_chunk_id,
 146                 time_t creation_time, bool session_name_contains_creation_time,
 147                 struct lttcomm_relayd_create_session_reply_2_11 *reply,
 148                 char *output_path)
 149 {
 150         int ret;
 151         struct lttcomm_relayd_create_session_2_11 *msg = NULL;
 152         size_t session_name_len;
 153         size_t hostname_len;
 154         size_t base_path_len;
 155         size_t msg_length;
 156         char *dst;
 157
 158         if (!base_path) {
 159                 base_path = "";
 160         }
 161         /* The three names are sent with a '\0' delimiter between them. */
 162         session_name_len = strlen(session_name) + 1;
 163         hostname_len = strlen(hostname) + 1;
 164         base_path_len = strlen(base_path) + 1;
 165
 166         msg_length = sizeof(*msg) + session_name_len + hostname_len + base_path_len;
 167         msg = zmalloc(msg_length);
 168         if (!msg) {
 169                 PERROR("zmalloc create_session_2_11 command message");
 170                 ret = -1;
 171                 goto error;
 172         }
 173
 174         assert(session_name_len <= UINT32_MAX);
 175         msg->session_name_len = htobe32(session_name_len);
 176
 177         assert(hostname_len <= UINT32_MAX);
 178         msg->hostname_len = htobe32(hostname_len);
 179
 180         assert(base_path_len <= UINT32_MAX);
 181         msg->base_path_len = htobe32(base_path_len);
 182
 183         dst = msg->names;
 184         if (lttng_strncpy(dst, session_name, session_name_len)) {
 185                 ret = -1;
 186                 goto error;
 187         }
 188         dst += session_name_len;
 189         if (lttng_strncpy(dst, hostname, hostname_len)) {
 190                 ret = -1;
 191                 goto error;
 192         }
 193         dst += hostname_len;
 194         if (lttng_strncpy(dst, base_path, base_path_len)) {
 195                 ret = -1;
 196                 goto error;
 197         }
 198
 199         msg->live_timer = htobe32(session_live_timer);
 200         msg->snapshot = !!snapshot;
 201
 202         lttng_uuid_copy(msg->sessiond_uuid, sessiond_uuid);
 203         msg->session_id = htobe64(sessiond_session_id);
 204         msg->session_name_contains_creation_time = session_name_contains_creation_time;
 205         if (current_chunk_id) {
 206                 LTTNG_OPTIONAL_SET(&msg->current_chunk_id,
 207                                 htobe64(*current_chunk_id));
 208         }
 209
 210         msg->creation_time = htobe64((uint64_t) creation_time);
 211
 212         /* Send command */
 213         ret = send_command(rsock, RELAYD_CREATE_SESSION, msg, msg_length, 0);
 214         if (ret < 0) {
 215                 goto error;
 216         }
 217         /* Receive response */
 218         ret = recv_reply(rsock, reply, sizeof(*reply));
 219         if (ret < 0) {
 220                 goto error;
 221         }
 222         reply->generic.session_id = be64toh(reply->generic.session_id);
 223         reply->generic.ret_code = be32toh(reply->generic.ret_code);
 224         reply->output_path_length = be32toh(reply->output_path_length);
 225         if (reply->output_path_length >= LTTNG_PATH_MAX) {
 226                 ERR("Invalid session output path length in reply (%" PRIu32 " bytes) exceeds maximal allowed length (%d bytes)",
 227                                 reply->output_path_length, LTTNG_PATH_MAX);
 228                 ret = -1;
 229                 goto error;
 230         }
 231         ret = recv_reply(rsock, output_path, reply->output_path_length);
 232         if (ret < 0) {
 233                 goto error;
 234         }
 235 error:
 236         free(msg);
 237         return ret;
 238 }
 239 /*
 240  * From 2.4 to 2.10, RELAYD_CREATE_SESSION takes additional parameters to
 241  * support the live reading capability.
 242  */
 243 static int relayd_create_session_2_4(struct lttcomm_relayd_sock *rsock,
 244                 const char *session_name, const char *hostname,
 245                 int session_live_timer, unsigned int snapshot,
 246                 struct lttcomm_relayd_status_session *reply)
 247 {
 248         int ret;
 249         struct lttcomm_relayd_create_session_2_4 msg;
 250
 251         if (lttng_strncpy(msg.session_name, session_name,
 252                         sizeof(msg.session_name))) {
 253                 ret = -1;
 254                 goto error;
 255         }
 256         if (lttng_strncpy(msg.hostname, hostname, sizeof(msg.hostname))) {
 257                 ret = -1;
 258                 goto error;
 259         }
 260         msg.live_timer = htobe32(session_live_timer);
 261         msg.snapshot = htobe32(snapshot);
 262
 263         /* Send command */
 264         ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
 265         if (ret < 0) {
 266                 goto error;
 267         }
 268
 269         /* Receive response */
 270         ret = recv_reply(rsock, reply, sizeof(*reply));
 271         if (ret < 0) {
 272                 goto error;
 273         }
 274         reply->session_id = be64toh(reply->session_id);
 275         reply->ret_code = be32toh(reply->ret_code);
 276 error:
 277         return ret;
 278 }
 279
 280 /*
 281  * RELAYD_CREATE_SESSION from 2.1 to 2.3.
 282  */
 283 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock,
 284                 struct lttcomm_relayd_status_session *reply)
 285 {
 286         int ret;
 287
 288         /* Send command */
 289         ret = send_command(rsock, RELAYD_CREATE_SESSION, NULL, 0, 0);
 290         if (ret < 0) {
 291                 goto error;
 292         }
 293
 294         /* Receive response */
 295         ret = recv_reply(rsock, reply, sizeof(*reply));
 296         if (ret < 0) {
 297                 goto error;
 298         }
 299         reply->session_id = be64toh(reply->session_id);
 300         reply->ret_code = be32toh(reply->ret_code);
 301 error:
 302         return ret;
 303 }
 304
 305 /*
 306  * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
 307  * set session_id of the relayd if we have a successful reply from the relayd.
 308  *
 309  * On success, return 0 else a negative value which is either an errno error or
 310  * a lttng error code from the relayd.
 311  */
 312 int relayd_create_session(struct lttcomm_relayd_sock *rsock,
 313                 uint64_t *relayd_session_id,
 314                 const char *session_name, const char *hostname,
 315                 const char *base_path, int session_live_timer,
 316                 unsigned int snapshot, uint64_t sessiond_session_id,
 317                 const lttng_uuid sessiond_uuid,
 318                 const uint64_t *current_chunk_id,
 319                 time_t creation_time, bool session_name_contains_creation_time,
 320                 char *output_path)
 321 {
 322         int ret;
 323         struct lttcomm_relayd_create_session_reply_2_11 reply = {};
 324
 325         assert(rsock);
 326         assert(relayd_session_id);
 327
 328         DBG("Relayd create session");
 329
 330         if (rsock->minor < 4) {
 331                 /* From 2.1 to 2.3 */
 332                 ret = relayd_create_session_2_1(rsock, &reply.generic);
 333         } else if (rsock->minor >= 4 && rsock->minor < 11) {
 334                 /* From 2.4 to 2.10 */
 335                 ret = relayd_create_session_2_4(rsock, session_name,
 336                                 hostname, session_live_timer, snapshot,
 337                                 &reply.generic);
 338         } else {
 339                 /* From 2.11 to ... */
 340                 ret = relayd_create_session_2_11(rsock, session_name,
 341                                 hostname, base_path, session_live_timer, snapshot,
 342                                 sessiond_session_id, sessiond_uuid,
 343                                 current_chunk_id, creation_time,
 344                                 session_name_contains_creation_time,
 345                                 &reply, output_path);
 346         }
 347
 348         if (ret < 0) {
 349                 goto error;
 350         }
 351
 352         /* Return session id or negative ret code. */
 353         if (reply.generic.ret_code != LTTNG_OK) {
 354                 ret = -1;
 355                 ERR("Relayd create session replied error %d",
 356                         reply.generic.ret_code);
 357                 goto error;
 358         } else {
 359                 ret = 0;
 360                 *relayd_session_id = reply.generic.session_id;
 361         }
 362
 363         DBG("Relayd session created with id %" PRIu64, reply.generic.session_id);
 364
 365 error:
 366         return ret;
 367 }
 368
 369 static int relayd_add_stream_2_1(struct lttcomm_relayd_sock *rsock,
 370                 const char *channel_name, const char *pathname)
 371 {
 372         int ret;
 373         struct lttcomm_relayd_add_stream msg;
 374
 375         memset(&msg, 0, sizeof(msg));
 376         if (lttng_strncpy(msg.channel_name, channel_name,
 377                                 sizeof(msg.channel_name))) {
 378                 ret = -1;
 379                 goto error;
 380         }
 381
 382         if (lttng_strncpy(msg.pathname, pathname,
 383                                 sizeof(msg.pathname))) {
 384                 ret = -1;
 385                 goto error;
 386         }
 387
 388         /* Send command */
 389         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 390         if (ret < 0) {
 391                 ret = -1;
 392                 goto error;
 393         }
 394         ret = 0;
 395 error:
 396         return ret;
 397 }
 398
 399 static int relayd_add_stream_2_2(struct lttcomm_relayd_sock *rsock,
 400                 const char *channel_name, const char *pathname,
 401                 uint64_t tracefile_size, uint64_t tracefile_count)
 402 {
 403         int ret;
 404         struct lttcomm_relayd_add_stream_2_2 msg;
 405
 406         memset(&msg, 0, sizeof(msg));
 407         /* Compat with relayd 2.2 to 2.10 */
 408         if (lttng_strncpy(msg.channel_name, channel_name,
 409                                 sizeof(msg.channel_name))) {
 410                 ret = -1;
 411                 goto error;
 412         }
 413         if (lttng_strncpy(msg.pathname, pathname,
 414                                 sizeof(msg.pathname))) {
 415                 ret = -1;
 416                 goto error;
 417         }
 418         msg.tracefile_size = htobe64(tracefile_size);
 419         msg.tracefile_count = htobe64(tracefile_count);
 420
 421         /* Send command */
 422         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 423         if (ret < 0) {
 424                 goto error;
 425         }
 426         ret = 0;
 427 error:
 428         return ret;
 429 }
 430
 431 static int relayd_add_stream_2_11(struct lttcomm_relayd_sock *rsock,
 432                 const char *channel_name, const char *pathname,
 433                 uint64_t tracefile_size, uint64_t tracefile_count,
 434                 uint64_t trace_archive_id)
 435 {
 436         int ret;
 437         struct lttcomm_relayd_add_stream_2_11 *msg = NULL;
 438         size_t channel_name_len;
 439         size_t pathname_len;
 440         size_t msg_length;
 441
 442         /* The two names are sent with a '\0' delimiter between them. */
 443         channel_name_len = strlen(channel_name) + 1;
 444         pathname_len = strlen(pathname) + 1;
 445
 446         msg_length = sizeof(*msg) + channel_name_len + pathname_len;
 447         msg = zmalloc(msg_length);
 448         if (!msg) {
 449                 PERROR("zmalloc add_stream_2_11 command message");
 450                 ret = -1;
 451                 goto error;
 452         }
 453
 454         assert(channel_name_len <= UINT32_MAX);
 455         msg->channel_name_len = htobe32(channel_name_len);
 456
 457         assert(pathname_len <= UINT32_MAX);
 458         msg->pathname_len = htobe32(pathname_len);
 459
 460         if (lttng_strncpy(msg->names, channel_name, channel_name_len)) {
 461                 ret = -1;
 462                 goto error;
 463         }
 464         if (lttng_strncpy(msg->names + channel_name_len, pathname, pathname_len)) {
 465                 ret = -1;
 466                 goto error;
 467         }
 468
 469         msg->tracefile_size = htobe64(tracefile_size);
 470         msg->tracefile_count = htobe64(tracefile_count);
 471         msg->trace_chunk_id = htobe64(trace_archive_id);
 472
 473         /* Send command */
 474         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) msg, msg_length, 0);
 475         if (ret < 0) {
 476                 goto error;
 477         }
 478         ret = 0;
 479 error:
 480         free(msg);
 481         return ret;
 482 }
 483
 484 /*
 485  * Add stream on the relayd and assign stream handle to the stream_id argument.
 486  *
 487  * Chunks are not supported by relayd prior to 2.11, but are used to
 488  * internally between session daemon and consumer daemon to keep track
 489  * of the channel and stream output path.
 490  *
 491  * On success return 0 else return ret_code negative value.
 492  */
 493 int relayd_add_stream(struct lttcomm_relayd_sock *rsock, const char *channel_name,
 494                 const char *domain_name, const char *_pathname, uint64_t *stream_id,
 495                 uint64_t tracefile_size, uint64_t tracefile_count,
 496                 struct lttng_trace_chunk *trace_chunk)
 497 {
 498         int ret;
 499         struct lttcomm_relayd_status_stream reply;
 500         char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
 501         char *separator;
 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         if (_pathname[0] == '\0') {
 513                 separator = "";
 514         } else {
 515                 separator = "/";
 516         }
 517         ret = snprintf(pathname, RELAYD_COMM_LTTNG_PATH_MAX, "%s%s%s",
 518                         domain_name, separator, _pathname);
 519         if (ret <= 0 || ret >= RELAYD_COMM_LTTNG_PATH_MAX) {
 520                 ERR("stream path too long.");
 521                 ret = -1;
 522                 goto error;
 523         }
 524
 525         /* Compat with relayd 2.1 */
 526         if (rsock->minor == 1) {
 527                 /* For 2.1 */
 528                 ret = relayd_add_stream_2_1(rsock, channel_name, pathname);
 529
 530         } else if (rsock->minor > 1 && rsock->minor < 11) {
 531                 /* From 2.2 to 2.10 */
 532                 ret = relayd_add_stream_2_2(rsock, channel_name, pathname,
 533                                 tracefile_size, tracefile_count);
 534         } else {
 535                 enum lttng_trace_chunk_status chunk_status;
 536                 uint64_t chunk_id;
 537
 538                 chunk_status = lttng_trace_chunk_get_id(trace_chunk,
 539                                 &chunk_id);
 540                 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
 541
 542                 /* From 2.11 to ...*/
 543                 ret = relayd_add_stream_2_11(rsock, channel_name, pathname,
 544                                 tracefile_size, tracefile_count,
 545                                 chunk_id);
 546         }
 547
 548         if (ret) {
 549                 ret = -1;
 550                 goto error;
 551         }
 552
 553         /* Waiting for reply */
 554         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 555         if (ret < 0) {
 556                 goto error;
 557         }
 558
 559         /* Back to host bytes order. */
 560         reply.handle = be64toh(reply.handle);
 561         reply.ret_code = be32toh(reply.ret_code);
 562
 563         /* Return session id or negative ret code. */
 564         if (reply.ret_code != LTTNG_OK) {
 565                 ret = -1;
 566                 ERR("Relayd add stream replied error %d", reply.ret_code);
 567         } else {
 568                 /* Success */
 569                 ret = 0;
 570                 *stream_id = reply.handle;
 571         }
 572
 573         DBG("Relayd stream added successfully with handle %" PRIu64,
 574                         reply.handle);
 575
 576 error:
 577         return ret;
 578 }
 579
 580 /*
 581  * Inform the relay that all the streams for the current channel has been sent.
 582  *
 583  * On success return 0 else return ret_code negative value.
 584  */
 585 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 586 {
 587         int ret;
 588         struct lttcomm_relayd_generic_reply reply;
 589
 590         /* Code flow error. Safety net. */
 591         assert(rsock);
 592
 593         DBG("Relayd sending streams sent.");
 594
 595         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 596         if (rsock->minor < 4) {
 597                 ret = 0;
 598                 goto end;
 599         }
 600
 601         /* Send command */
 602         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 603         if (ret < 0) {
 604                 goto error;
 605         }
 606
 607         /* Waiting for reply */
 608         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 609         if (ret < 0) {
 610                 goto error;
 611         }
 612
 613         /* Back to host bytes order. */
 614         reply.ret_code = be32toh(reply.ret_code);
 615
 616         /* Return session id or negative ret code. */
 617         if (reply.ret_code != LTTNG_OK) {
 618                 ret = -1;
 619                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 620                 goto error;
 621         } else {
 622                 /* Success */
 623                 ret = 0;
 624         }
 625
 626         DBG("Relayd streams sent success");
 627
 628 error:
 629 end:
 630         return ret;
 631 }
 632
 633 /*
 634  * Check version numbers on the relayd.
 635  * If major versions are compatible, we assign minor_to_use to the
 636  * minor version of the procotol we are going to use for this session.
 637  *
 638  * Return 0 if the two daemons are compatible, LTTNG_ERR_RELAYD_VERSION_FAIL
 639  * otherwise, or a negative value on network errors.
 640  */
 641 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 642 {
 643         int ret;
 644         struct lttcomm_relayd_version msg;
 645
 646         /* Code flow error. Safety net. */
 647         assert(rsock);
 648
 649         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 650                         rsock->minor);
 651
 652         memset(&msg, 0, sizeof(msg));
 653         /* Prepare network byte order before transmission. */
 654         msg.major = htobe32(rsock->major);
 655         msg.minor = htobe32(rsock->minor);
 656
 657         /* Send command */
 658         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 659         if (ret < 0) {
 660                 goto error;
 661         }
 662
 663         /* Receive response */
 664         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 665         if (ret < 0) {
 666                 goto error;
 667         }
 668
 669         /* Set back to host bytes order */
 670         msg.major = be32toh(msg.major);
 671         msg.minor = be32toh(msg.minor);
 672
 673         /*
 674          * Only validate the major version. If the other side is higher,
 675          * communication is not possible. Only major version equal can talk to each
 676          * other. If the minor version differs, the lowest version is used by both
 677          * sides.
 678          */
 679         if (msg.major != rsock->major) {
 680                 /* Not compatible */
 681                 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
 682                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 683                                 msg.major, rsock->major);
 684                 goto error;
 685         }
 686
 687         /*
 688          * If the relayd's minor version is higher, it will adapt to our version so
 689          * we can continue to use the latest relayd communication data structure.
 690          * If the received minor version is higher, the relayd should adapt to us.
 691          */
 692         if (rsock->minor > msg.minor) {
 693                 rsock->minor = msg.minor;
 694         }
 695
 696         /* Version number compatible */
 697         DBG2("Relayd version is compatible, using protocol version %u.%u",
 698                         rsock->major, rsock->minor);
 699         ret = 0;
 700
 701 error:
 702         return ret;
 703 }
 704
 705 /*
 706  * Add stream on the relayd and assign stream handle to the stream_id argument.
 707  *
 708  * On success return 0 else return ret_code negative value.
 709  */
 710 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 711 {
 712         int ret;
 713
 714         /* Code flow error. Safety net. */
 715         assert(rsock);
 716
 717         DBG("Relayd sending metadata of size %zu", len);
 718
 719         /* Send command */
 720         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 721         if (ret < 0) {
 722                 goto error;
 723         }
 724
 725         DBG2("Relayd metadata added successfully");
 726
 727         /*
 728          * After that call, the metadata data MUST be sent to the relayd so the
 729          * receive size on the other end matches the len of the metadata packet
 730          * header. This is why we don't wait for a reply here.
 731          */
 732
 733 error:
 734         return ret;
 735 }
 736
 737 /*
 738  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 739  */
 740 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 741 {
 742         /* Code flow error. Safety net. */
 743         assert(rsock);
 744
 745         if (!rsock->sock.ops) {
 746                 /*
 747                  * Attempting a connect on a non-initialized socket.
 748                  */
 749                 return -ECONNRESET;
 750         }
 751
 752         DBG3("Relayd connect ...");
 753
 754         return rsock->sock.ops->connect(&rsock->sock);
 755 }
 756
 757 /*
 758  * Close relayd socket with an allocated lttcomm_relayd_sock.
 759  *
 760  * If no socket operations are found, simply return 0 meaning that everything
 761  * is fine. Without operations, the socket can not possibly be opened or used.
 762  * This is possible if the socket was allocated but not created. However, the
 763  * caller could simply use it to store a valid file descriptor for instance
 764  * passed over a Unix socket and call this to cleanup but still without a valid
 765  * ops pointer.
 766  *
 767  * Return the close returned value. On error, a negative value is usually
 768  * returned back from close(2).
 769  */
 770 int relayd_close(struct lttcomm_relayd_sock *rsock)
 771 {
 772         int ret;
 773
 774         /* Code flow error. Safety net. */
 775         assert(rsock);
 776
 777         /* An invalid fd is fine, return success. */
 778         if (rsock->sock.fd < 0) {
 779                 ret = 0;
 780                 goto end;
 781         }
 782
 783         DBG3("Relayd closing socket %d", rsock->sock.fd);
 784
 785         if (rsock->sock.ops) {
 786                 ret = rsock->sock.ops->close(&rsock->sock);
 787         } else {
 788                 /* Default call if no specific ops found. */
 789                 ret = close(rsock->sock.fd);
 790                 if (ret < 0) {
 791                         PERROR("relayd_close default close");
 792                 }
 793         }
 794         rsock->sock.fd = -1;
 795
 796 end:
 797         return ret;
 798 }
 799
 800 /*
 801  * Send data header structure to the relayd.
 802  */
 803 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 804                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 805 {
 806         int ret;
 807
 808         /* Code flow error. Safety net. */
 809         assert(rsock);
 810         assert(hdr);
 811
 812         if (rsock->sock.fd < 0) {
 813                 return -ECONNRESET;
 814         }
 815
 816         DBG3("Relayd sending data header of size %zu", size);
 817
 818         /* Again, safety net */
 819         if (size == 0) {
 820                 size = sizeof(struct lttcomm_relayd_data_hdr);
 821         }
 822
 823         /* Only send data header. */
 824         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 825         if (ret < 0) {
 826                 ret = -errno;
 827                 goto error;
 828         }
 829
 830         /*
 831          * The data MUST be sent right after that command for the receive on the
 832          * other end to match the size in the header.
 833          */
 834
 835 error:
 836         return ret;
 837 }
 838
 839 /*
 840  * Send close stream command to the relayd.
 841  */
 842 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 843                 uint64_t last_net_seq_num)
 844 {
 845         int ret;
 846         struct lttcomm_relayd_close_stream msg;
 847         struct lttcomm_relayd_generic_reply reply;
 848
 849         /* Code flow error. Safety net. */
 850         assert(rsock);
 851
 852         DBG("Relayd closing stream id %" PRIu64, stream_id);
 853
 854         memset(&msg, 0, sizeof(msg));
 855         msg.stream_id = htobe64(stream_id);
 856         msg.last_net_seq_num = htobe64(last_net_seq_num);
 857
 858         /* Send command */
 859         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 860         if (ret < 0) {
 861                 goto error;
 862         }
 863
 864         /* Receive response */
 865         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 866         if (ret < 0) {
 867                 goto error;
 868         }
 869
 870         reply.ret_code = be32toh(reply.ret_code);
 871
 872         /* Return session id or negative ret code. */
 873         if (reply.ret_code != LTTNG_OK) {
 874                 ret = -1;
 875                 ERR("Relayd close stream replied error %d", reply.ret_code);
 876         } else {
 877                 /* Success */
 878                 ret = 0;
 879         }
 880
 881         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 882
 883 error:
 884         return ret;
 885 }
 886
 887 /*
 888  * Check for data availability for a given stream id.
 889  *
 890  * Return 0 if NOT pending, 1 if so and a negative value on error.
 891  */
 892 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 893                 uint64_t last_net_seq_num)
 894 {
 895         int ret;
 896         struct lttcomm_relayd_data_pending msg;
 897         struct lttcomm_relayd_generic_reply reply;
 898
 899         /* Code flow error. Safety net. */
 900         assert(rsock);
 901
 902         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 903
 904         memset(&msg, 0, sizeof(msg));
 905         msg.stream_id = htobe64(stream_id);
 906         msg.last_net_seq_num = htobe64(last_net_seq_num);
 907
 908         /* Send command */
 909         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 910                         sizeof(msg), 0);
 911         if (ret < 0) {
 912                 goto error;
 913         }
 914
 915         /* Receive response */
 916         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 917         if (ret < 0) {
 918                 goto error;
 919         }
 920
 921         reply.ret_code = be32toh(reply.ret_code);
 922
 923         /* Return session id or negative ret code. */
 924         if (reply.ret_code >= LTTNG_OK) {
 925                 ERR("Relayd data pending replied error %d", reply.ret_code);
 926         }
 927
 928         /* At this point, the ret code is either 1 or 0 */
 929         ret = reply.ret_code;
 930
 931         DBG("Relayd data is %s pending for stream id %" PRIu64,
 932                         ret == 1 ? "" : "NOT", stream_id);
 933
 934 error:
 935         return ret;
 936 }
 937
 938 /*
 939  * Check on the relayd side for a quiescent state on the control socket.
 940  */
 941 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 942                 uint64_t metadata_stream_id)
 943 {
 944         int ret;
 945         struct lttcomm_relayd_quiescent_control msg;
 946         struct lttcomm_relayd_generic_reply reply;
 947
 948         /* Code flow error. Safety net. */
 949         assert(rsock);
 950
 951         DBG("Relayd checking quiescent control state");
 952
 953         memset(&msg, 0, sizeof(msg));
 954         msg.stream_id = htobe64(metadata_stream_id);
 955
 956         /* Send command */
 957         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 958         if (ret < 0) {
 959                 goto error;
 960         }
 961
 962         /* Receive response */
 963         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 964         if (ret < 0) {
 965                 goto error;
 966         }
 967
 968         reply.ret_code = be32toh(reply.ret_code);
 969
 970         /* Return session id or negative ret code. */
 971         if (reply.ret_code != LTTNG_OK) {
 972                 ret = -1;
 973                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 974                 goto error;
 975         }
 976
 977         /* Control socket is quiescent */
 978         return 0;
 979
 980 error:
 981         return ret;
 982 }
 983
 984 /*
 985  * Begin a data pending command for a specific session id.
 986  */
 987 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 988 {
 989         int ret;
 990         struct lttcomm_relayd_begin_data_pending msg;
 991         struct lttcomm_relayd_generic_reply reply;
 992
 993         /* Code flow error. Safety net. */
 994         assert(rsock);
 995
 996         DBG("Relayd begin data pending");
 997
 998         memset(&msg, 0, sizeof(msg));
 999         msg.session_id = htobe64(id);
1000
1001         /* Send command */
1002         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
1003         if (ret < 0) {
1004                 goto error;
1005         }
1006
1007         /* Receive response */
1008         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1009         if (ret < 0) {
1010                 goto error;
1011         }
1012
1013         reply.ret_code = be32toh(reply.ret_code);
1014
1015         /* Return session id or negative ret code. */
1016         if (reply.ret_code != LTTNG_OK) {
1017                 ret = -1;
1018                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
1019                 goto error;
1020         }
1021
1022         return 0;
1023
1024 error:
1025         return ret;
1026 }
1027
1028 /*
1029  * End a data pending command for a specific session id.
1030  *
1031  * Return 0 on success and set is_data_inflight to 0 if no data is being
1032  * streamed or 1 if it is the case.
1033  */
1034 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
1035                 unsigned int *is_data_inflight)
1036 {
1037         int ret, recv_ret;
1038         struct lttcomm_relayd_end_data_pending msg;
1039         struct lttcomm_relayd_generic_reply reply;
1040
1041         /* Code flow error. Safety net. */
1042         assert(rsock);
1043
1044         DBG("Relayd end data pending");
1045
1046         memset(&msg, 0, sizeof(msg));
1047         msg.session_id = htobe64(id);
1048
1049         /* Send command */
1050         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
1051         if (ret < 0) {
1052                 goto error;
1053         }
1054
1055         /* Receive response */
1056         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1057         if (ret < 0) {
1058                 goto error;
1059         }
1060
1061         recv_ret = be32toh(reply.ret_code);
1062         if (recv_ret < 0) {
1063                 ret = recv_ret;
1064                 goto error;
1065         }
1066
1067         *is_data_inflight = recv_ret;
1068
1069         DBG("Relayd end data pending is data inflight: %d", recv_ret);
1070
1071         return 0;
1072
1073 error:
1074         return ret;
1075 }
1076
1077 /*
1078  * Send index to the relayd.
1079  */
1080 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
1081                 struct ctf_packet_index *index, uint64_t relay_stream_id,
1082                 uint64_t net_seq_num)
1083 {
1084         int ret;
1085         struct lttcomm_relayd_index msg;
1086         struct lttcomm_relayd_generic_reply reply;
1087
1088         /* Code flow error. Safety net. */
1089         assert(rsock);
1090
1091         if (rsock->minor < 4) {
1092                 DBG("Not sending indexes before protocol 2.4");
1093                 ret = 0;
1094                 goto error;
1095         }
1096
1097         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
1098
1099         memset(&msg, 0, sizeof(msg));
1100         msg.relay_stream_id = htobe64(relay_stream_id);
1101         msg.net_seq_num = htobe64(net_seq_num);
1102
1103         /* The index is already in big endian. */
1104         msg.packet_size = index->packet_size;
1105         msg.content_size = index->content_size;
1106         msg.timestamp_begin = index->timestamp_begin;
1107         msg.timestamp_end = index->timestamp_end;
1108         msg.events_discarded = index->events_discarded;
1109         msg.stream_id = index->stream_id;
1110
1111         if (rsock->minor >= 8) {
1112                 msg.stream_instance_id = index->stream_instance_id;
1113                 msg.packet_seq_num = index->packet_seq_num;
1114         }
1115
1116         /* Send command */
1117         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg,
1118                 lttcomm_relayd_index_len(lttng_to_index_major(rsock->major,
1119                                                                 rsock->minor),
1120                                 lttng_to_index_minor(rsock->major, rsock->minor)),
1121                                 0);
1122         if (ret < 0) {
1123                 goto error;
1124         }
1125
1126         /* Receive response */
1127         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1128         if (ret < 0) {
1129                 goto error;
1130         }
1131
1132         reply.ret_code = be32toh(reply.ret_code);
1133
1134         /* Return session id or negative ret code. */
1135         if (reply.ret_code != LTTNG_OK) {
1136                 ret = -1;
1137                 ERR("Relayd send index replied error %d", reply.ret_code);
1138         } else {
1139                 /* Success */
1140                 ret = 0;
1141         }
1142
1143 error:
1144         return ret;
1145 }
1146
1147 /*
1148  * Ask the relay to reset the metadata trace file (regeneration).
1149  */
1150 int relayd_reset_metadata(struct lttcomm_relayd_sock *rsock,
1151                 uint64_t stream_id, uint64_t version)
1152 {
1153         int ret;
1154         struct lttcomm_relayd_reset_metadata msg;
1155         struct lttcomm_relayd_generic_reply reply;
1156
1157         /* Code flow error. Safety net. */
1158         assert(rsock);
1159
1160         /* Should have been prevented by the sessiond. */
1161         if (rsock->minor < 8) {
1162                 ERR("Metadata regeneration unsupported before 2.8");
1163                 ret = -1;
1164                 goto error;
1165         }
1166
1167         DBG("Relayd reset metadata stream id %" PRIu64, stream_id);
1168
1169         memset(&msg, 0, sizeof(msg));
1170         msg.stream_id = htobe64(stream_id);
1171         msg.version = htobe64(version);
1172
1173         /* Send command */
1174         ret = send_command(rsock, RELAYD_RESET_METADATA, (void *) &msg, sizeof(msg), 0);
1175         if (ret < 0) {
1176                 goto error;
1177         }
1178
1179         /* Receive response */
1180         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1181         if (ret < 0) {
1182                 goto error;
1183         }
1184
1185         reply.ret_code = be32toh(reply.ret_code);
1186
1187         /* Return session id or negative ret code. */
1188         if (reply.ret_code != LTTNG_OK) {
1189                 ret = -1;
1190                 ERR("Relayd reset metadata replied error %d", reply.ret_code);
1191         } else {
1192                 /* Success */
1193                 ret = 0;
1194         }
1195
1196         DBG("Relayd reset metadata stream id %" PRIu64 " successfully", stream_id);
1197
1198 error:
1199         return ret;
1200 }
1201
1202 int relayd_rotate_streams(struct lttcomm_relayd_sock *sock,
1203                 unsigned int stream_count, const uint64_t *new_chunk_id,
1204                 const struct relayd_stream_rotation_position *positions)
1205 {
1206         int ret;
1207         unsigned int i;
1208         struct lttng_dynamic_buffer payload;
1209         struct lttcomm_relayd_generic_reply reply = {};
1210         const struct lttcomm_relayd_rotate_streams msg = {
1211                 .stream_count = htobe32((uint32_t) stream_count),
1212                 .new_chunk_id = (typeof(msg.new_chunk_id)) {
1213                         .is_set = !!new_chunk_id,
1214                         .value = htobe64(new_chunk_id ? *new_chunk_id : 0),
1215                 },
1216         };
1217         char new_chunk_id_buf[MAX_INT_DEC_LEN(*new_chunk_id)] = {};
1218         const char *new_chunk_id_str;
1219
1220         if (!relayd_supports_chunks(sock)) {
1221                 DBG("Refusing to rotate remote streams: relayd does not support chunks");
1222                 return 0;
1223         }
1224
1225         lttng_dynamic_buffer_init(&payload);
1226
1227         /* Code flow error. Safety net. */
1228         assert(sock);
1229
1230         if (new_chunk_id) {
1231                 ret = snprintf(new_chunk_id_buf, sizeof(new_chunk_id_buf),
1232                                 "%" PRIu64, *new_chunk_id);
1233                 if (ret == -1 || ret >= sizeof(new_chunk_id_buf)) {
1234                         new_chunk_id_str = "formatting error";
1235                 } else {
1236                         new_chunk_id_str = new_chunk_id_buf;
1237                 }
1238         } else {
1239                 new_chunk_id_str = "none";
1240         }
1241
1242         DBG("Preparing \"rotate streams\" command payload: new_chunk_id = %s, stream_count = %u",
1243                         new_chunk_id_str, stream_count);
1244
1245         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1246         if (ret) {
1247                 ERR("Failed to allocate \"rotate streams\" command payload");
1248                 goto error;
1249         }
1250
1251         for (i = 0; i < stream_count; i++) {
1252                 const struct relayd_stream_rotation_position *position =
1253                                 &positions[i];
1254                 const struct lttcomm_relayd_stream_rotation_position comm_position = {
1255                         .stream_id = htobe64(position->stream_id),
1256                         .rotate_at_seq_num = htobe64(
1257                                         position->rotate_at_seq_num),
1258                 };
1259
1260                 DBG("Rotate stream %" PRIu64 "at sequence number %" PRIu64,
1261                                 position->stream_id,
1262                                 position->rotate_at_seq_num);
1263                 ret = lttng_dynamic_buffer_append(&payload, &comm_position,
1264                                 sizeof(comm_position));
1265                 if (ret) {
1266                         ERR("Failed to allocate \"rotate streams\" command payload");
1267                         goto error;
1268                 }
1269         }
1270
1271         /* Send command. */
1272         ret = send_command(sock, RELAYD_ROTATE_STREAMS, payload.data,
1273                         payload.size, 0);
1274         if (ret < 0) {
1275                 ERR("Failed to send \"rotate stream\" command");
1276                 goto error;
1277         }
1278
1279         /* Receive response. */
1280         ret = recv_reply(sock, &reply, sizeof(reply));
1281         if (ret < 0) {
1282                 ERR("Failed to receive \"rotate streams\" command reply");
1283                 goto error;
1284         }
1285
1286         reply.ret_code = be32toh(reply.ret_code);
1287         if (reply.ret_code != LTTNG_OK) {
1288                 ret = -1;
1289                 ERR("Relayd rotate streams replied error %d", reply.ret_code);
1290         } else {
1291                 /* Success. */
1292                 ret = 0;
1293                 DBG("Relayd rotated streams successfully");
1294         }
1295
1296 error:
1297         lttng_dynamic_buffer_reset(&payload);
1298         return ret;
1299 }
1300
1301 int relayd_create_trace_chunk(struct lttcomm_relayd_sock *sock,
1302                 struct lttng_trace_chunk *chunk)
1303 {
1304         int ret = 0;
1305         enum lttng_trace_chunk_status status;
1306         struct lttcomm_relayd_create_trace_chunk msg = {};
1307         struct lttcomm_relayd_generic_reply reply = {};
1308         struct lttng_dynamic_buffer payload;
1309         uint64_t chunk_id;
1310         time_t creation_timestamp;
1311         const char *chunk_name;
1312         size_t chunk_name_length;
1313         bool overridden_name;
1314
1315         lttng_dynamic_buffer_init(&payload);
1316
1317         if (!relayd_supports_chunks(sock)) {
1318                 DBG("Refusing to create remote trace chunk: relayd does not support chunks");
1319                 goto end;
1320         }
1321
1322         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1323         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1324                 ret = -1;
1325                 goto end;
1326         }
1327
1328         status = lttng_trace_chunk_get_creation_timestamp(
1329                         chunk, &creation_timestamp);
1330         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1331                 ret = -1;
1332                 goto end;
1333         }
1334
1335         status = lttng_trace_chunk_get_name(
1336                         chunk, &chunk_name, &overridden_name);
1337         if (status != LTTNG_TRACE_CHUNK_STATUS_OK &&
1338                         status != LTTNG_TRACE_CHUNK_STATUS_NONE) {
1339                 ret = -1;
1340                 goto end;
1341         }
1342
1343         chunk_name_length = overridden_name ? (strlen(chunk_name) + 1) : 0;
1344         msg = (typeof(msg)){
1345                 .chunk_id = htobe64(chunk_id),
1346                 .creation_timestamp = htobe64((uint64_t) creation_timestamp),
1347                 .override_name_length = htobe32((uint32_t) chunk_name_length),
1348         };
1349
1350         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1351         if (ret) {
1352                 goto end;
1353         }
1354         if (chunk_name_length) {
1355                 ret = lttng_dynamic_buffer_append(
1356                                 &payload, chunk_name, chunk_name_length);
1357                 if (ret) {
1358                         goto end;
1359                 }
1360         }
1361
1362         ret = send_command(sock, RELAYD_CREATE_TRACE_CHUNK, payload.data,
1363                         payload.size, 0);
1364         if (ret < 0) {
1365                 ERR("Failed to send trace chunk creation command to relay daemon");
1366                 goto end;
1367         }
1368
1369         ret = recv_reply(sock, &reply, sizeof(reply));
1370         if (ret < 0) {
1371                 ERR("Failed to receive relay daemon trace chunk creation command reply");
1372                 goto end;
1373         }
1374
1375         reply.ret_code = be32toh(reply.ret_code);
1376         if (reply.ret_code != LTTNG_OK) {
1377                 ret = -1;
1378                 ERR("Relayd trace chunk create replied error %d",
1379                                 reply.ret_code);
1380         } else {
1381                 ret = 0;
1382                 DBG("Relayd successfully created trace chunk: chunk_id = %" PRIu64,
1383                                 chunk_id);
1384         }
1385
1386 end:
1387         lttng_dynamic_buffer_reset(&payload);
1388         return ret;
1389 }
1390
1391 int relayd_close_trace_chunk(struct lttcomm_relayd_sock *sock,
1392                 struct lttng_trace_chunk *chunk,
1393                 char *path)
1394 {
1395         int ret = 0;
1396         enum lttng_trace_chunk_status status;
1397         struct lttcomm_relayd_close_trace_chunk msg = {};
1398         struct lttcomm_relayd_close_trace_chunk_reply reply = {};
1399         uint64_t chunk_id;
1400         time_t close_timestamp;
1401         LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command = {};
1402
1403         if (!relayd_supports_chunks(sock)) {
1404                 DBG("Refusing to close remote trace chunk: relayd does not support chunks");
1405                 goto end;
1406         }
1407
1408         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1409         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1410                 ERR("Failed to get trace chunk id");
1411                 ret = -1;
1412                 goto end;
1413         }
1414
1415         status = lttng_trace_chunk_get_close_timestamp(chunk, &close_timestamp);
1416         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1417                 ERR("Failed to get trace chunk close timestamp");
1418                 ret = -1;
1419                 goto end;
1420         }
1421
1422         status = lttng_trace_chunk_get_close_command(chunk,
1423                         &close_command.value);
1424         switch (status) {
1425         case LTTNG_TRACE_CHUNK_STATUS_OK:
1426                 close_command.is_set = 1;
1427                 break;
1428         case LTTNG_TRACE_CHUNK_STATUS_NONE:
1429                 break;
1430         default:
1431                 ERR("Failed to get trace chunk close command");
1432                 ret = -1;
1433                 goto end;
1434         }
1435
1436         msg = (typeof(msg)){
1437                 .chunk_id = htobe64(chunk_id),
1438                 .close_timestamp = htobe64((uint64_t) close_timestamp),
1439                 .close_command = {
1440                         .value = htobe32((uint32_t) close_command.value),
1441                         .is_set = close_command.is_set,
1442                 },
1443         };
1444
1445         ret = send_command(sock, RELAYD_CLOSE_TRACE_CHUNK, &msg, sizeof(msg),
1446                         0);
1447         if (ret < 0) {
1448                 ERR("Failed to send trace chunk close command to relay daemon");
1449                 goto end;
1450         }
1451
1452         ret = recv_reply(sock, &reply, sizeof(reply));
1453         if (ret < 0) {
1454                 ERR("Failed to receive relay daemon trace chunk close command reply");
1455                 goto end;
1456         }
1457
1458         reply.path_length = be32toh(reply.path_length);
1459         if (reply.path_length >= LTTNG_PATH_MAX) {
1460                 ERR("Chunk path too long");
1461                 ret = -1;
1462                 goto end;
1463         }
1464
1465         ret = recv_reply(sock, path, reply.path_length);
1466         if (ret < 0) {
1467                 ERR("Failed to receive relay daemon trace chunk close command reply");
1468                 goto end;
1469         }
1470         if (path[reply.path_length - 1] != '\0') {
1471                 ERR("Invalid trace chunk path returned by relay daemon (not null-terminated)");
1472                 ret = -1;
1473                 goto end;
1474         }
1475
1476         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1477         if (reply.generic.ret_code != LTTNG_OK) {
1478                 ret = -1;
1479                 ERR("Relayd trace chunk close replied error %d",
1480                                 reply.generic.ret_code);
1481         } else {
1482                 ret = 0;
1483                 DBG("Relayd successfully closed trace chunk: chunk_id = %" PRIu64,
1484                                 chunk_id);
1485         }
1486 end:
1487         return ret;
1488 }
1489
1490 int relayd_trace_chunk_exists(struct lttcomm_relayd_sock *sock,
1491                 uint64_t chunk_id, bool *chunk_exists)
1492 {
1493         int ret = 0;
1494         struct lttcomm_relayd_trace_chunk_exists msg = {};
1495         struct lttcomm_relayd_trace_chunk_exists_reply reply = {};
1496
1497         if (!relayd_supports_chunks(sock)) {
1498                 DBG("Refusing to check for trace chunk existence: relayd does not support chunks");
1499                 /* The chunk will never exist */
1500                 *chunk_exists = false;
1501                 goto end;
1502         }
1503
1504         msg = (typeof(msg)){
1505                         .chunk_id = htobe64(chunk_id),
1506         };
1507
1508         ret = send_command(sock, RELAYD_TRACE_CHUNK_EXISTS, &msg, sizeof(msg),
1509                         0);
1510         if (ret < 0) {
1511                 ERR("Failed to send trace chunk exists command to relay daemon");
1512                 goto end;
1513         }
1514
1515         ret = recv_reply(sock, &reply, sizeof(reply));
1516         if (ret < 0) {
1517                 ERR("Failed to receive relay daemon trace chunk close command reply");
1518                 goto end;
1519         }
1520
1521         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1522         if (reply.generic.ret_code != LTTNG_OK) {
1523                 ret = -1;
1524                 ERR("Relayd trace chunk close replied error %d",
1525                                 reply.generic.ret_code);
1526         } else {
1527                 ret = 0;
1528                 DBG("Relayd successfully checked trace chunk existence: chunk_id = %" PRIu64
1529                                 ", exists = %s", chunk_id,
1530                                 reply.trace_chunk_exists ? "true" : "false");
1531                 *chunk_exists = !!reply.trace_chunk_exists;
1532         }
1533 end:
1534         return ret;
1535 }