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