src/common/relayd/relayd.cpp

   1 /*
   2  * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #define _LGPL_SOURCE
   9 #include "relayd.hpp"
  10
  11 #include <common/common.hpp>
  12 #include <common/compat/endian.hpp>
  13 #include <common/compat/string.hpp>
  14 #include <common/defaults.hpp>
  15 #include <common/index/ctf-index.hpp>
  16 #include <common/sessiond-comm/relayd.hpp>
  17 #include <common/string-utils/format.hpp>
  18 #include <common/trace-chunk.hpp>
  19
  20 #include <inttypes.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25
  26 static bool relayd_supports_chunks(const struct lttcomm_relayd_sock *sock)
  27 {
  28         if (sock->major > 2) {
  29                 return true;
  30         } else if (sock->major == 2 && sock->minor >= 11) {
  31                 return true;
  32         }
  33         return false;
  34 }
  35
  36 static bool relayd_supports_get_configuration(const struct lttcomm_relayd_sock *sock)
  37 {
  38         if (sock->major > 2) {
  39                 return true;
  40         } else if (sock->major == 2 && sock->minor >= 12) {
  41                 return true;
  42         }
  43         return false;
  44 }
  45
  46 /*
  47  * Send command. Fill up the header and append the data.
  48  */
  49 static int send_command(struct lttcomm_relayd_sock *rsock,
  50                         enum lttcomm_relayd_command cmd,
  51                         const void *data,
  52                         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 = calloc<char>(buf_size);
  69         if (buf == nullptr) {
  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 %s of size %" PRIu64,
  90              lttcomm_relayd_command_str(cmd),
  91              buf_size);
  92         ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  93         if (ret < 0) {
  94                 PERROR("Failed to send command %s of size %" PRIu64,
  95                        lttcomm_relayd_command_str(cmd),
  96                        buf_size);
  97                 ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  98                 ret = -errno;
  99                 goto error;
 100         }
 101 error:
 102         free(buf);
 103 alloc_error:
 104         return ret;
 105 }
 106
 107 /*
 108  * Receive reply data on socket. This MUST be call after send_command or else
 109  * could result in unexpected behavior(s).
 110  */
 111 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
 112 {
 113         int ret;
 114
 115         if (rsock->sock.fd < 0) {
 116                 return -ECONNRESET;
 117         }
 118
 119         DBG3("Relayd waiting for reply of size %zu", size);
 120
 121         ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
 122         if (ret <= 0 || ret != size) {
 123                 if (ret == 0) {
 124                         /* Orderly shutdown. */
 125                         DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
 126                 } else {
 127                         DBG("Receiving reply failed on sock %d for size %zu with ret %d",
 128                             rsock->sock.fd,
 129                             size,
 130                             ret);
 131                 }
 132                 /* Always return -1 here and the caller can use errno. */
 133                 ret = -1;
 134                 goto error;
 135         }
 136
 137 error:
 138         return ret;
 139 }
 140
 141 /*
 142  * Starting from 2.11, RELAYD_CREATE_SESSION payload (session_name,
 143  * hostname, and base_path) have no length restriction on the sender side.
 144  * Length for both payloads is stored in the msg struct. A new dynamic size
 145  * payload size is introduced.
 146  */
 147 static int relayd_create_session_2_11(struct lttcomm_relayd_sock *rsock,
 148                                       const char *session_name,
 149                                       const char *hostname,
 150                                       const char *base_path,
 151                                       int session_live_timer,
 152                                       unsigned int snapshot,
 153                                       uint64_t sessiond_session_id,
 154                                       const lttng_uuid& sessiond_uuid,
 155                                       const uint64_t *current_chunk_id,
 156                                       time_t creation_time,
 157                                       bool session_name_contains_creation_time,
 158                                       struct lttcomm_relayd_create_session_reply_2_11 *reply,
 159                                       char *output_path)
 160 {
 161         int ret;
 162         struct lttcomm_relayd_create_session_2_11 *msg = nullptr;
 163         size_t session_name_len;
 164         size_t hostname_len;
 165         size_t base_path_len;
 166         size_t msg_length;
 167         char *dst;
 168
 169         if (!base_path) {
 170                 base_path = "";
 171         }
 172         /* The three names are sent with a '\0' delimiter between them. */
 173         session_name_len = strlen(session_name) + 1;
 174         hostname_len = strlen(hostname) + 1;
 175         base_path_len = strlen(base_path) + 1;
 176
 177         msg_length = sizeof(*msg) + session_name_len + hostname_len + base_path_len;
 178         msg = zmalloc<lttcomm_relayd_create_session_2_11>(msg_length);
 179         if (!msg) {
 180                 PERROR("zmalloc create_session_2_11 command message");
 181                 ret = -1;
 182                 goto error;
 183         }
 184
 185         LTTNG_ASSERT(session_name_len <= UINT32_MAX);
 186         msg->session_name_len = htobe32(session_name_len);
 187
 188         LTTNG_ASSERT(hostname_len <= UINT32_MAX);
 189         msg->hostname_len = htobe32(hostname_len);
 190
 191         LTTNG_ASSERT(base_path_len <= UINT32_MAX);
 192         msg->base_path_len = htobe32(base_path_len);
 193
 194         dst = msg->names;
 195         if (lttng_strncpy(dst, session_name, session_name_len)) {
 196                 ret = -1;
 197                 goto error;
 198         }
 199         dst += session_name_len;
 200         if (lttng_strncpy(dst, hostname, hostname_len)) {
 201                 ret = -1;
 202                 goto error;
 203         }
 204         dst += hostname_len;
 205         if (lttng_strncpy(dst, base_path, base_path_len)) {
 206                 ret = -1;
 207                 goto error;
 208         }
 209
 210         msg->live_timer = htobe32(session_live_timer);
 211         msg->snapshot = !!snapshot;
 212
 213         std::copy(sessiond_uuid.begin(), sessiond_uuid.end(), msg->sessiond_uuid);
 214         msg->session_id = htobe64(sessiond_session_id);
 215         msg->session_name_contains_creation_time = session_name_contains_creation_time;
 216         if (current_chunk_id) {
 217                 LTTNG_OPTIONAL_SET(&msg->current_chunk_id, htobe64(*current_chunk_id));
 218         }
 219
 220         msg->creation_time = htobe64((uint64_t) creation_time);
 221
 222         /* Send command */
 223         ret = send_command(rsock, RELAYD_CREATE_SESSION, msg, msg_length, 0);
 224         if (ret < 0) {
 225                 goto error;
 226         }
 227         /* Receive response */
 228         ret = recv_reply(rsock, reply, sizeof(*reply));
 229         if (ret < 0) {
 230                 goto error;
 231         }
 232         reply->generic.session_id = be64toh(reply->generic.session_id);
 233         reply->generic.ret_code = be32toh(reply->generic.ret_code);
 234         reply->output_path_length = be32toh(reply->output_path_length);
 235         if (reply->output_path_length >= LTTNG_PATH_MAX) {
 236                 ERR("Invalid session output path length in reply (%" PRIu32
 237                     " bytes) exceeds maximal allowed length (%d bytes)",
 238                     reply->output_path_length,
 239                     LTTNG_PATH_MAX);
 240                 ret = -1;
 241                 goto error;
 242         }
 243         ret = recv_reply(rsock, output_path, reply->output_path_length);
 244         if (ret < 0) {
 245                 goto error;
 246         }
 247 error:
 248         free(msg);
 249         return ret;
 250 }
 251 /*
 252  * From 2.4 to 2.10, RELAYD_CREATE_SESSION takes additional parameters to
 253  * support the live reading capability.
 254  */
 255 static int relayd_create_session_2_4(struct lttcomm_relayd_sock *rsock,
 256                                      const char *session_name,
 257                                      const char *hostname,
 258                                      int session_live_timer,
 259                                      unsigned int snapshot,
 260                                      struct lttcomm_relayd_status_session *reply)
 261 {
 262         int ret;
 263         struct lttcomm_relayd_create_session_2_4 msg;
 264
 265         if (lttng_strncpy(msg.session_name, session_name, sizeof(msg.session_name))) {
 266                 ret = -1;
 267                 goto error;
 268         }
 269         if (lttng_strncpy(msg.hostname, hostname, sizeof(msg.hostname))) {
 270                 ret = -1;
 271                 goto error;
 272         }
 273         msg.live_timer = htobe32(session_live_timer);
 274         msg.snapshot = htobe32(snapshot);
 275
 276         /* Send command */
 277         ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
 278         if (ret < 0) {
 279                 goto error;
 280         }
 281
 282         /* Receive response */
 283         ret = recv_reply(rsock, reply, sizeof(*reply));
 284         if (ret < 0) {
 285                 goto error;
 286         }
 287         reply->session_id = be64toh(reply->session_id);
 288         reply->ret_code = be32toh(reply->ret_code);
 289 error:
 290         return ret;
 291 }
 292
 293 /*
 294  * RELAYD_CREATE_SESSION from 2.1 to 2.3.
 295  */
 296 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock,
 297                                      struct lttcomm_relayd_status_session *reply)
 298 {
 299         int ret;
 300
 301         /* Send command */
 302         ret = send_command(rsock, RELAYD_CREATE_SESSION, nullptr, 0, 0);
 303         if (ret < 0) {
 304                 goto error;
 305         }
 306
 307         /* Receive response */
 308         ret = recv_reply(rsock, reply, sizeof(*reply));
 309         if (ret < 0) {
 310                 goto error;
 311         }
 312         reply->session_id = be64toh(reply->session_id);
 313         reply->ret_code = be32toh(reply->ret_code);
 314 error:
 315         return ret;
 316 }
 317
 318 /*
 319  * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
 320  * set session_id of the relayd if we have a successful reply from the relayd.
 321  *
 322  * On success, return 0 else a negative value which is either an errno error or
 323  * a lttng error code from the relayd.
 324  */
 325 int relayd_create_session(struct lttcomm_relayd_sock *rsock,
 326                           uint64_t *relayd_session_id,
 327                           const char *session_name,
 328                           const char *hostname,
 329                           const char *base_path,
 330                           int session_live_timer,
 331                           unsigned int snapshot,
 332                           uint64_t sessiond_session_id,
 333                           const lttng_uuid& sessiond_uuid,
 334                           const uint64_t *current_chunk_id,
 335                           time_t creation_time,
 336                           bool session_name_contains_creation_time,
 337                           char *output_path)
 338 {
 339         int ret;
 340         struct lttcomm_relayd_create_session_reply_2_11 reply = {};
 341
 342         LTTNG_ASSERT(rsock);
 343         LTTNG_ASSERT(relayd_session_id);
 344
 345         DBG("Relayd create session");
 346
 347         if (rsock->minor < 4) {
 348                 /* From 2.1 to 2.3 */
 349                 ret = relayd_create_session_2_1(rsock, &reply.generic);
 350         } else if (rsock->minor >= 4 && rsock->minor < 11) {
 351                 /* From 2.4 to 2.10 */
 352                 ret = relayd_create_session_2_4(
 353                         rsock, session_name, hostname, session_live_timer, snapshot, &reply.generic);
 354         } else {
 355                 /* From 2.11 to ... */
 356                 ret = relayd_create_session_2_11(rsock,
 357                                                  session_name,
 358                                                  hostname,
 359                                                  base_path,
 360                                                  session_live_timer,
 361                                                  snapshot,
 362                                                  sessiond_session_id,
 363                                                  sessiond_uuid,
 364                                                  current_chunk_id,
 365                                                  creation_time,
 366                                                  session_name_contains_creation_time,
 367                                                  &reply,
 368                                                  output_path);
 369         }
 370
 371         if (ret < 0) {
 372                 goto error;
 373         }
 374
 375         /* Return session id or negative ret code. */
 376         if (reply.generic.ret_code != LTTNG_OK) {
 377                 ret = -1;
 378                 ERR("Relayd create session replied error %d", reply.generic.ret_code);
 379                 goto error;
 380         } else {
 381                 ret = 0;
 382                 *relayd_session_id = reply.generic.session_id;
 383         }
 384
 385         DBG("Relayd session created with id %" PRIu64, reply.generic.session_id);
 386
 387 error:
 388         return ret;
 389 }
 390
 391 static int relayd_add_stream_2_1(struct lttcomm_relayd_sock *rsock,
 392                                  const char *channel_name,
 393                                  const char *pathname)
 394 {
 395         int ret;
 396         struct lttcomm_relayd_add_stream msg;
 397
 398         memset(&msg, 0, sizeof(msg));
 399         if (lttng_strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name))) {
 400                 ret = -1;
 401                 goto error;
 402         }
 403
 404         if (lttng_strncpy(msg.pathname, pathname, sizeof(msg.pathname))) {
 405                 ret = -1;
 406                 goto error;
 407         }
 408
 409         /* Send command */
 410         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 411         if (ret < 0) {
 412                 ret = -1;
 413                 goto error;
 414         }
 415         ret = 0;
 416 error:
 417         return ret;
 418 }
 419
 420 static int relayd_add_stream_2_2(struct lttcomm_relayd_sock *rsock,
 421                                  const char *channel_name,
 422                                  const char *pathname,
 423                                  uint64_t tracefile_size,
 424                                  uint64_t tracefile_count)
 425 {
 426         int ret;
 427         struct lttcomm_relayd_add_stream_2_2 msg;
 428
 429         memset(&msg, 0, sizeof(msg));
 430         /* Compat with relayd 2.2 to 2.10 */
 431         if (lttng_strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name))) {
 432                 ret = -1;
 433                 goto error;
 434         }
 435         if (lttng_strncpy(msg.pathname, pathname, sizeof(msg.pathname))) {
 436                 ret = -1;
 437                 goto error;
 438         }
 439         msg.tracefile_size = htobe64(tracefile_size);
 440         msg.tracefile_count = htobe64(tracefile_count);
 441
 442         /* Send command */
 443         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 444         if (ret < 0) {
 445                 goto error;
 446         }
 447         ret = 0;
 448 error:
 449         return ret;
 450 }
 451
 452 static int relayd_add_stream_2_11(struct lttcomm_relayd_sock *rsock,
 453                                   const char *channel_name,
 454                                   const char *pathname,
 455                                   uint64_t tracefile_size,
 456                                   uint64_t tracefile_count,
 457                                   uint64_t trace_archive_id)
 458 {
 459         int ret;
 460         struct lttcomm_relayd_add_stream_2_11 *msg = nullptr;
 461         size_t channel_name_len;
 462         size_t pathname_len;
 463         size_t msg_length;
 464
 465         /* The two names are sent with a '\0' delimiter between them. */
 466         channel_name_len = strlen(channel_name) + 1;
 467         pathname_len = strlen(pathname) + 1;
 468
 469         msg_length = sizeof(*msg) + channel_name_len + pathname_len;
 470         msg = zmalloc<lttcomm_relayd_add_stream_2_11>(msg_length);
 471         if (!msg) {
 472                 PERROR("zmalloc add_stream_2_11 command message");
 473                 ret = -1;
 474                 goto error;
 475         }
 476
 477         LTTNG_ASSERT(channel_name_len <= UINT32_MAX);
 478         msg->channel_name_len = htobe32(channel_name_len);
 479
 480         LTTNG_ASSERT(pathname_len <= UINT32_MAX);
 481         msg->pathname_len = htobe32(pathname_len);
 482
 483         if (lttng_strncpy(msg->names, channel_name, channel_name_len)) {
 484                 ret = -1;
 485                 goto error;
 486         }
 487         if (lttng_strncpy(msg->names + channel_name_len, pathname, pathname_len)) {
 488                 ret = -1;
 489                 goto error;
 490         }
 491
 492         msg->tracefile_size = htobe64(tracefile_size);
 493         msg->tracefile_count = htobe64(tracefile_count);
 494         msg->trace_chunk_id = htobe64(trace_archive_id);
 495
 496         /* Send command */
 497         ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) msg, msg_length, 0);
 498         if (ret < 0) {
 499                 goto error;
 500         }
 501         ret = 0;
 502 error:
 503         free(msg);
 504         return ret;
 505 }
 506
 507 /*
 508  * Add stream on the relayd and assign stream handle to the stream_id argument.
 509  *
 510  * Chunks are not supported by relayd prior to 2.11, but are used to
 511  * internally between session daemon and consumer daemon to keep track
 512  * of the channel and stream output path.
 513  *
 514  * On success return 0 else return ret_code negative value.
 515  */
 516 int relayd_add_stream(struct lttcomm_relayd_sock *rsock,
 517                       const char *channel_name,
 518                       const char *domain_name,
 519                       const char *_pathname,
 520                       uint64_t *stream_id,
 521                       uint64_t tracefile_size,
 522                       uint64_t tracefile_count,
 523                       struct lttng_trace_chunk *trace_chunk)
 524 {
 525         int ret;
 526         struct lttcomm_relayd_status_stream reply;
 527         char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
 528
 529         /* Code flow error. Safety net. */
 530         LTTNG_ASSERT(rsock);
 531         LTTNG_ASSERT(channel_name);
 532         LTTNG_ASSERT(domain_name);
 533         LTTNG_ASSERT(_pathname);
 534         LTTNG_ASSERT(trace_chunk);
 535
 536         DBG("Relayd adding stream for channel name %s", channel_name);
 537
 538         /* Compat with relayd 2.1 */
 539         if (rsock->minor == 1) {
 540                 /* For 2.1 */
 541                 ret = relayd_add_stream_2_1(rsock, channel_name, _pathname);
 542
 543         } else if (rsock->minor > 1 && rsock->minor < 11) {
 544                 /* From 2.2 to 2.10 */
 545                 ret = relayd_add_stream_2_2(
 546                         rsock, channel_name, _pathname, tracefile_size, tracefile_count);
 547         } else {
 548                 const char *separator;
 549                 enum lttng_trace_chunk_status chunk_status;
 550                 uint64_t chunk_id;
 551
 552                 if (_pathname[0] == '\0') {
 553                         separator = "";
 554                 } else {
 555                         separator = "/";
 556                 }
 557
 558                 ret = snprintf(pathname,
 559                                RELAYD_COMM_LTTNG_PATH_MAX,
 560                                "%s%s%s",
 561                                domain_name,
 562                                separator,
 563                                _pathname);
 564                 if (ret <= 0 || ret >= RELAYD_COMM_LTTNG_PATH_MAX) {
 565                         ERR("Failed to format stream path: %s",
 566                             ret <= 0 ? "formatting error" : "path exceeds maximal allowed length");
 567                         ret = -1;
 568                         goto error;
 569                 }
 570
 571                 chunk_status = lttng_trace_chunk_get_id(trace_chunk, &chunk_id);
 572                 LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
 573
 574                 /* From 2.11 to ...*/
 575                 ret = relayd_add_stream_2_11(
 576                         rsock, channel_name, pathname, tracefile_size, tracefile_count, chunk_id);
 577         }
 578
 579         if (ret) {
 580                 ret = -1;
 581                 goto error;
 582         }
 583
 584         /* Waiting for reply */
 585         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 586         if (ret < 0) {
 587                 goto error;
 588         }
 589
 590         /* Back to host bytes order. */
 591         reply.handle = be64toh(reply.handle);
 592         reply.ret_code = be32toh(reply.ret_code);
 593
 594         /* Return session id or negative ret code. */
 595         if (reply.ret_code != LTTNG_OK) {
 596                 ret = -1;
 597                 ERR("Relayd add stream replied error %d", reply.ret_code);
 598         } else {
 599                 /* Success */
 600                 ret = 0;
 601                 *stream_id = reply.handle;
 602         }
 603
 604         DBG("Relayd stream added successfully with handle %" PRIu64, reply.handle);
 605
 606 error:
 607         return ret;
 608 }
 609
 610 /*
 611  * Inform the relay that all the streams for the current channel has been sent.
 612  *
 613  * On success return 0 else return ret_code negative value.
 614  */
 615 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 616 {
 617         int ret;
 618         struct lttcomm_relayd_generic_reply reply;
 619
 620         /* Code flow error. Safety net. */
 621         LTTNG_ASSERT(rsock);
 622
 623         DBG("Relayd sending streams sent.");
 624
 625         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 626         if (rsock->minor < 4) {
 627                 ret = 0;
 628                 goto end;
 629         }
 630
 631         /* Send command */
 632         ret = send_command(rsock, RELAYD_STREAMS_SENT, nullptr, 0, 0);
 633         if (ret < 0) {
 634                 goto error;
 635         }
 636
 637         /* Waiting for reply */
 638         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 639         if (ret < 0) {
 640                 goto error;
 641         }
 642
 643         /* Back to host bytes order. */
 644         reply.ret_code = be32toh(reply.ret_code);
 645
 646         /* Return session id or negative ret code. */
 647         if (reply.ret_code != LTTNG_OK) {
 648                 ret = -1;
 649                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 650                 goto error;
 651         } else {
 652                 /* Success */
 653                 ret = 0;
 654         }
 655
 656         DBG("Relayd streams sent success");
 657
 658 error:
 659 end:
 660         return ret;
 661 }
 662
 663 /*
 664  * Check version numbers on the relayd.
 665  * If major versions are compatible, we assign minor_to_use to the
 666  * minor version of the procotol we are going to use for this session.
 667  *
 668  * Return 0 if the two daemons are compatible, LTTNG_ERR_RELAYD_VERSION_FAIL
 669  * otherwise, or a negative value on network errors.
 670  */
 671 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 672 {
 673         int ret;
 674         struct lttcomm_relayd_version msg;
 675
 676         /* Code flow error. Safety net. */
 677         LTTNG_ASSERT(rsock);
 678
 679         DBG("Relayd version check for major.minor %u.%u", rsock->major, rsock->minor);
 680
 681         memset(&msg, 0, sizeof(msg));
 682         /* Prepare network byte order before transmission. */
 683         msg.major = htobe32(rsock->major);
 684         msg.minor = htobe32(rsock->minor);
 685
 686         /* Send command */
 687         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 688         if (ret < 0) {
 689                 goto error;
 690         }
 691
 692         /* Receive response */
 693         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 694         if (ret < 0) {
 695                 goto error;
 696         }
 697
 698         /* Set back to host bytes order */
 699         msg.major = be32toh(msg.major);
 700         msg.minor = be32toh(msg.minor);
 701
 702         /*
 703          * Only validate the major version. If the other side is higher,
 704          * communication is not possible. Only major version equal can talk to each
 705          * other. If the minor version differs, the lowest version is used by both
 706          * sides.
 707          */
 708         if (msg.major != rsock->major) {
 709                 /* Not compatible */
 710                 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
 711                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 712                      msg.major,
 713                      rsock->major);
 714                 goto error;
 715         }
 716
 717         /*
 718          * If the relayd's minor version is higher, it will adapt to our version so
 719          * we can continue to use the latest relayd communication data structure.
 720          * If the received minor version is higher, the relayd should adapt to us.
 721          */
 722         if (rsock->minor > msg.minor) {
 723                 rsock->minor = msg.minor;
 724         }
 725
 726         /* Version number compatible */
 727         DBG2("Relayd version is compatible, using protocol version %u.%u",
 728              rsock->major,
 729              rsock->minor);
 730         ret = 0;
 731
 732 error:
 733         return ret;
 734 }
 735
 736 /*
 737  * Add stream on the relayd and assign stream handle to the stream_id argument.
 738  *
 739  * On success return 0 else return ret_code negative value.
 740  */
 741 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 742 {
 743         int ret;
 744
 745         /* Code flow error. Safety net. */
 746         LTTNG_ASSERT(rsock);
 747
 748         DBG("Relayd sending metadata of size %zu", len);
 749
 750         /* Send command */
 751         ret = send_command(rsock, RELAYD_SEND_METADATA, nullptr, len, 0);
 752         if (ret < 0) {
 753                 goto error;
 754         }
 755
 756         DBG2("Relayd metadata added successfully");
 757
 758         /*
 759          * After that call, the metadata data MUST be sent to the relayd so the
 760          * receive size on the other end matches the len of the metadata packet
 761          * header. This is why we don't wait for a reply here.
 762          */
 763
 764 error:
 765         return ret;
 766 }
 767
 768 /*
 769  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 770  */
 771 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 772 {
 773         /* Code flow error. Safety net. */
 774         LTTNG_ASSERT(rsock);
 775
 776         if (!rsock->sock.ops) {
 777                 /*
 778                  * Attempting a connect on a non-initialized socket.
 779                  */
 780                 return -ECONNRESET;
 781         }
 782
 783         DBG3("Relayd connect ...");
 784
 785         return rsock->sock.ops->connect(&rsock->sock);
 786 }
 787
 788 /*
 789  * Close relayd socket with an allocated lttcomm_relayd_sock.
 790  *
 791  * If no socket operations are found, simply return 0 meaning that everything
 792  * is fine. Without operations, the socket can not possibly be opened or used.
 793  * This is possible if the socket was allocated but not created. However, the
 794  * caller could simply use it to store a valid file descriptor for instance
 795  * passed over a Unix socket and call this to cleanup but still without a valid
 796  * ops pointer.
 797  *
 798  * Return the close returned value. On error, a negative value is usually
 799  * returned back from close(2).
 800  */
 801 int relayd_close(struct lttcomm_relayd_sock *rsock)
 802 {
 803         int ret;
 804
 805         /* Code flow error. Safety net. */
 806         LTTNG_ASSERT(rsock);
 807
 808         /* An invalid fd is fine, return success. */
 809         if (rsock->sock.fd < 0) {
 810                 ret = 0;
 811                 goto end;
 812         }
 813
 814         DBG3("Relayd closing socket %d", rsock->sock.fd);
 815
 816         if (rsock->sock.ops) {
 817                 ret = rsock->sock.ops->close(&rsock->sock);
 818         } else {
 819                 /* Default call if no specific ops found. */
 820                 ret = close(rsock->sock.fd);
 821                 if (ret < 0) {
 822                         PERROR("relayd_close default close");
 823                 }
 824         }
 825         rsock->sock.fd = -1;
 826
 827 end:
 828         return ret;
 829 }
 830
 831 /*
 832  * Send data header structure to the relayd.
 833  */
 834 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 835                          struct lttcomm_relayd_data_hdr *hdr,
 836                          size_t size)
 837 {
 838         int ret;
 839
 840         /* Code flow error. Safety net. */
 841         LTTNG_ASSERT(rsock);
 842         LTTNG_ASSERT(hdr);
 843
 844         if (rsock->sock.fd < 0) {
 845                 return -ECONNRESET;
 846         }
 847
 848         DBG3("Relayd sending data header of size %zu", size);
 849
 850         /* Again, safety net */
 851         if (size == 0) {
 852                 size = sizeof(struct lttcomm_relayd_data_hdr);
 853         }
 854
 855         /* Only send data header. */
 856         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 857         if (ret < 0) {
 858                 ret = -errno;
 859                 goto error;
 860         }
 861
 862         /*
 863          * The data MUST be sent right after that command for the receive on the
 864          * other end to match the size in the header.
 865          */
 866
 867 error:
 868         return ret;
 869 }
 870
 871 /*
 872  * Send close stream command to the relayd.
 873  */
 874 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock,
 875                              uint64_t stream_id,
 876                              uint64_t last_net_seq_num)
 877 {
 878         int ret;
 879         struct lttcomm_relayd_close_stream msg;
 880         struct lttcomm_relayd_generic_reply reply;
 881
 882         /* Code flow error. Safety net. */
 883         LTTNG_ASSERT(rsock);
 884
 885         DBG("Relayd closing stream id %" PRIu64, stream_id);
 886
 887         memset(&msg, 0, sizeof(msg));
 888         msg.stream_id = htobe64(stream_id);
 889         msg.last_net_seq_num = htobe64(last_net_seq_num);
 890
 891         /* Send command */
 892         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 893         if (ret < 0) {
 894                 goto error;
 895         }
 896
 897         /* Receive response */
 898         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 899         if (ret < 0) {
 900                 goto error;
 901         }
 902
 903         reply.ret_code = be32toh(reply.ret_code);
 904
 905         /* Return session id or negative ret code. */
 906         if (reply.ret_code != LTTNG_OK) {
 907                 ret = -1;
 908                 ERR("Relayd close stream replied error %d", reply.ret_code);
 909         } else {
 910                 /* Success */
 911                 ret = 0;
 912         }
 913
 914         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 915
 916 error:
 917         return ret;
 918 }
 919
 920 /*
 921  * Check for data availability for a given stream id.
 922  *
 923  * Return 0 if NOT pending, 1 if so and a negative value on error.
 924  */
 925 int relayd_data_pending(struct lttcomm_relayd_sock *rsock,
 926                         uint64_t stream_id,
 927                         uint64_t last_net_seq_num)
 928 {
 929         int ret;
 930         struct lttcomm_relayd_data_pending msg;
 931         struct lttcomm_relayd_generic_reply reply;
 932
 933         /* Code flow error. Safety net. */
 934         LTTNG_ASSERT(rsock);
 935
 936         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 937
 938         memset(&msg, 0, sizeof(msg));
 939         msg.stream_id = htobe64(stream_id);
 940         msg.last_net_seq_num = htobe64(last_net_seq_num);
 941
 942         /* Send command */
 943         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg, sizeof(msg), 0);
 944         if (ret < 0) {
 945                 goto error;
 946         }
 947
 948         /* Receive response */
 949         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 950         if (ret < 0) {
 951                 goto error;
 952         }
 953
 954         reply.ret_code = be32toh(reply.ret_code);
 955
 956         /* Return session id or negative ret code. */
 957         if (reply.ret_code >= LTTNG_OK) {
 958                 ERR("Relayd data pending replied error %d", reply.ret_code);
 959         }
 960
 961         /* At this point, the ret code is either 1 or 0 */
 962         ret = reply.ret_code;
 963
 964         DBG("Relayd data is %s pending for stream id %" PRIu64, ret == 1 ? "" : "NOT", stream_id);
 965
 966 error:
 967         return ret;
 968 }
 969
 970 /*
 971  * Check on the relayd side for a quiescent state on the control socket.
 972  */
 973 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock, uint64_t metadata_stream_id)
 974 {
 975         int ret;
 976         struct lttcomm_relayd_quiescent_control msg;
 977         struct lttcomm_relayd_generic_reply reply;
 978
 979         /* Code flow error. Safety net. */
 980         LTTNG_ASSERT(rsock);
 981
 982         DBG("Relayd checking quiescent control state");
 983
 984         memset(&msg, 0, sizeof(msg));
 985         msg.stream_id = htobe64(metadata_stream_id);
 986
 987         /* Send command */
 988         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 989         if (ret < 0) {
 990                 goto error;
 991         }
 992
 993         /* Receive response */
 994         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 995         if (ret < 0) {
 996                 goto error;
 997         }
 998
 999         reply.ret_code = be32toh(reply.ret_code);
1000
1001         /* Return session id or negative ret code. */
1002         if (reply.ret_code != LTTNG_OK) {
1003                 ret = -1;
1004                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
1005                 goto error;
1006         }
1007
1008         /* Control socket is quiescent */
1009         return 0;
1010
1011 error:
1012         return ret;
1013 }
1014
1015 /*
1016  * Begin a data pending command for a specific session id.
1017  */
1018 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
1019 {
1020         int ret;
1021         struct lttcomm_relayd_begin_data_pending msg;
1022         struct lttcomm_relayd_generic_reply reply;
1023
1024         /* Code flow error. Safety net. */
1025         LTTNG_ASSERT(rsock);
1026
1027         DBG("Relayd begin data pending");
1028
1029         memset(&msg, 0, sizeof(msg));
1030         msg.session_id = htobe64(id);
1031
1032         /* Send command */
1033         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
1034         if (ret < 0) {
1035                 goto error;
1036         }
1037
1038         /* Receive response */
1039         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1040         if (ret < 0) {
1041                 goto error;
1042         }
1043
1044         reply.ret_code = be32toh(reply.ret_code);
1045
1046         /* Return session id or negative ret code. */
1047         if (reply.ret_code != LTTNG_OK) {
1048                 ret = -1;
1049                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
1050                 goto error;
1051         }
1052
1053         return 0;
1054
1055 error:
1056         return ret;
1057 }
1058
1059 /*
1060  * End a data pending command for a specific session id.
1061  *
1062  * Return 0 on success and set is_data_inflight to 0 if no data is being
1063  * streamed or 1 if it is the case.
1064  */
1065 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock,
1066                             uint64_t id,
1067                             unsigned int *is_data_inflight)
1068 {
1069         int ret, recv_ret;
1070         struct lttcomm_relayd_end_data_pending msg;
1071         struct lttcomm_relayd_generic_reply reply;
1072
1073         /* Code flow error. Safety net. */
1074         LTTNG_ASSERT(rsock);
1075
1076         DBG("Relayd end data pending");
1077
1078         memset(&msg, 0, sizeof(msg));
1079         msg.session_id = htobe64(id);
1080
1081         /* Send command */
1082         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
1083         if (ret < 0) {
1084                 goto error;
1085         }
1086
1087         /* Receive response */
1088         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1089         if (ret < 0) {
1090                 goto error;
1091         }
1092
1093         recv_ret = be32toh(reply.ret_code);
1094         if (recv_ret < 0) {
1095                 ret = recv_ret;
1096                 goto error;
1097         }
1098
1099         *is_data_inflight = recv_ret;
1100
1101         DBG("Relayd end data pending is data inflight: %d", recv_ret);
1102
1103         return 0;
1104
1105 error:
1106         return ret;
1107 }
1108
1109 /*
1110  * Send index to the relayd.
1111  */
1112 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
1113                       struct ctf_packet_index *index,
1114                       uint64_t relay_stream_id,
1115                       uint64_t net_seq_num)
1116 {
1117         int ret;
1118         struct lttcomm_relayd_index msg;
1119         struct lttcomm_relayd_generic_reply reply;
1120
1121         /* Code flow error. Safety net. */
1122         LTTNG_ASSERT(rsock);
1123
1124         if (rsock->minor < 4) {
1125                 DBG("Not sending indexes before protocol 2.4");
1126                 ret = 0;
1127                 goto error;
1128         }
1129
1130         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
1131
1132         memset(&msg, 0, sizeof(msg));
1133         msg.relay_stream_id = htobe64(relay_stream_id);
1134         msg.net_seq_num = htobe64(net_seq_num);
1135
1136         /* The index is already in big endian. */
1137         msg.packet_size = index->packet_size;
1138         msg.content_size = index->content_size;
1139         msg.timestamp_begin = index->timestamp_begin;
1140         msg.timestamp_end = index->timestamp_end;
1141         msg.events_discarded = index->events_discarded;
1142         msg.stream_id = index->stream_id;
1143
1144         if (rsock->minor >= 8) {
1145                 msg.stream_instance_id = index->stream_instance_id;
1146                 msg.packet_seq_num = index->packet_seq_num;
1147         }
1148
1149         /* Send command */
1150         ret = send_command(
1151                 rsock,
1152                 RELAYD_SEND_INDEX,
1153                 &msg,
1154                 lttcomm_relayd_index_len(lttng_to_index_major(rsock->major, rsock->minor),
1155                                          lttng_to_index_minor(rsock->major, rsock->minor)),
1156                 0);
1157         if (ret < 0) {
1158                 goto error;
1159         }
1160
1161         /* Receive response */
1162         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1163         if (ret < 0) {
1164                 goto error;
1165         }
1166
1167         reply.ret_code = be32toh(reply.ret_code);
1168
1169         /* Return session id or negative ret code. */
1170         if (reply.ret_code != LTTNG_OK) {
1171                 ret = -1;
1172                 ERR("Relayd send index replied error %d", reply.ret_code);
1173         } else {
1174                 /* Success */
1175                 ret = 0;
1176         }
1177
1178 error:
1179         return ret;
1180 }
1181
1182 /*
1183  * Ask the relay to reset the metadata trace file (regeneration).
1184  */
1185 int relayd_reset_metadata(struct lttcomm_relayd_sock *rsock, uint64_t stream_id, uint64_t version)
1186 {
1187         int ret;
1188         struct lttcomm_relayd_reset_metadata msg;
1189         struct lttcomm_relayd_generic_reply reply;
1190
1191         /* Code flow error. Safety net. */
1192         LTTNG_ASSERT(rsock);
1193
1194         /* Should have been prevented by the sessiond. */
1195         if (rsock->minor < 8) {
1196                 ERR("Metadata regeneration unsupported before 2.8");
1197                 ret = -1;
1198                 goto error;
1199         }
1200
1201         DBG("Relayd reset metadata stream id %" PRIu64, stream_id);
1202
1203         memset(&msg, 0, sizeof(msg));
1204         msg.stream_id = htobe64(stream_id);
1205         msg.version = htobe64(version);
1206
1207         /* Send command */
1208         ret = send_command(rsock, RELAYD_RESET_METADATA, (void *) &msg, sizeof(msg), 0);
1209         if (ret < 0) {
1210                 goto error;
1211         }
1212
1213         /* Receive response */
1214         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
1215         if (ret < 0) {
1216                 goto error;
1217         }
1218
1219         reply.ret_code = be32toh(reply.ret_code);
1220
1221         /* Return session id or negative ret code. */
1222         if (reply.ret_code != LTTNG_OK) {
1223                 ret = -1;
1224                 ERR("Relayd reset metadata replied error %d", reply.ret_code);
1225         } else {
1226                 /* Success */
1227                 ret = 0;
1228         }
1229
1230         DBG("Relayd reset metadata stream id %" PRIu64 " successfully", stream_id);
1231
1232 error:
1233         return ret;
1234 }
1235
1236 int relayd_rotate_streams(struct lttcomm_relayd_sock *sock,
1237                           unsigned int stream_count,
1238                           const uint64_t *new_chunk_id,
1239                           const struct relayd_stream_rotation_position *positions)
1240 {
1241         int ret;
1242         unsigned int i;
1243         struct lttng_dynamic_buffer payload;
1244         struct lttcomm_relayd_generic_reply reply = {};
1245         struct lttcomm_relayd_rotate_streams msg;
1246         char new_chunk_id_buf[MAX_INT_DEC_LEN(*new_chunk_id)] = {};
1247         const char *new_chunk_id_str;
1248
1249         msg.stream_count = htobe32((uint32_t) stream_count);
1250         msg.new_chunk_id = (typeof(msg.new_chunk_id)){
1251                 .is_set = !!new_chunk_id,
1252                 .value = htobe64(new_chunk_id ? *new_chunk_id : 0),
1253         };
1254
1255         if (!relayd_supports_chunks(sock)) {
1256                 DBG("Refusing to rotate remote streams: relayd does not support chunks");
1257                 return 0;
1258         }
1259
1260         lttng_dynamic_buffer_init(&payload);
1261
1262         /* Code flow error. Safety net. */
1263         LTTNG_ASSERT(sock);
1264
1265         if (new_chunk_id) {
1266                 ret = snprintf(
1267                         new_chunk_id_buf, sizeof(new_chunk_id_buf), "%" PRIu64, *new_chunk_id);
1268                 if (ret == -1 || ret >= sizeof(new_chunk_id_buf)) {
1269                         new_chunk_id_str = "formatting error";
1270                 } else {
1271                         new_chunk_id_str = new_chunk_id_buf;
1272                 }
1273         } else {
1274                 new_chunk_id_str = "none";
1275         }
1276
1277         DBG("Preparing \"rotate streams\" command payload: new_chunk_id = %s, stream_count = %u",
1278             new_chunk_id_str,
1279             stream_count);
1280
1281         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1282         if (ret) {
1283                 ERR("Failed to allocate \"rotate streams\" command payload");
1284                 goto error;
1285         }
1286
1287         for (i = 0; i < stream_count; i++) {
1288                 const struct relayd_stream_rotation_position *position = &positions[i];
1289                 const struct lttcomm_relayd_stream_rotation_position comm_position = {
1290                         .stream_id = htobe64(position->stream_id),
1291                         .rotate_at_seq_num = htobe64(position->rotate_at_seq_num),
1292                 };
1293
1294                 DBG("Rotate stream %" PRIu64 " at sequence number %" PRIu64,
1295                     position->stream_id,
1296                     position->rotate_at_seq_num);
1297                 ret = lttng_dynamic_buffer_append(&payload, &comm_position, sizeof(comm_position));
1298                 if (ret) {
1299                         ERR("Failed to allocate \"rotate streams\" command payload");
1300                         goto error;
1301                 }
1302         }
1303
1304         /* Send command. */
1305         ret = send_command(sock, RELAYD_ROTATE_STREAMS, payload.data, payload.size, 0);
1306         if (ret < 0) {
1307                 ERR("Failed to send \"rotate stream\" command");
1308                 goto error;
1309         }
1310
1311         /* Receive response. */
1312         ret = recv_reply(sock, &reply, sizeof(reply));
1313         if (ret < 0) {
1314                 ERR("Failed to receive \"rotate streams\" command reply");
1315                 goto error;
1316         }
1317
1318         reply.ret_code = be32toh(reply.ret_code);
1319         if (reply.ret_code != LTTNG_OK) {
1320                 ret = -1;
1321                 ERR("Relayd rotate streams replied error %d", reply.ret_code);
1322         } else {
1323                 /* Success. */
1324                 ret = 0;
1325                 DBG("Relayd rotated streams successfully");
1326         }
1327
1328 error:
1329         lttng_dynamic_buffer_reset(&payload);
1330         return ret;
1331 }
1332
1333 int relayd_create_trace_chunk(struct lttcomm_relayd_sock *sock, struct lttng_trace_chunk *chunk)
1334 {
1335         int ret = 0;
1336         enum lttng_trace_chunk_status status;
1337         struct lttcomm_relayd_create_trace_chunk msg = {};
1338         struct lttcomm_relayd_generic_reply reply = {};
1339         struct lttng_dynamic_buffer payload;
1340         uint64_t chunk_id;
1341         time_t creation_timestamp;
1342         const char *chunk_name;
1343         size_t chunk_name_length;
1344         bool overridden_name;
1345
1346         lttng_dynamic_buffer_init(&payload);
1347
1348         if (!relayd_supports_chunks(sock)) {
1349                 DBG("Refusing to create remote trace chunk: relayd does not support chunks");
1350                 goto end;
1351         }
1352
1353         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1354         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1355                 ret = -1;
1356                 goto end;
1357         }
1358
1359         status = lttng_trace_chunk_get_creation_timestamp(chunk, &creation_timestamp);
1360         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1361                 ret = -1;
1362                 goto end;
1363         }
1364
1365         status = lttng_trace_chunk_get_name(chunk, &chunk_name, &overridden_name);
1366         if (status != LTTNG_TRACE_CHUNK_STATUS_OK && status != LTTNG_TRACE_CHUNK_STATUS_NONE) {
1367                 ret = -1;
1368                 goto end;
1369         }
1370
1371         chunk_name_length = overridden_name ? (strlen(chunk_name) + 1) : 0;
1372         msg.chunk_id = htobe64(chunk_id);
1373         msg.creation_timestamp = htobe64((uint64_t) creation_timestamp);
1374         msg.override_name_length = htobe32((uint32_t) chunk_name_length);
1375
1376         ret = lttng_dynamic_buffer_append(&payload, &msg, sizeof(msg));
1377         if (ret) {
1378                 goto end;
1379         }
1380         if (chunk_name_length) {
1381                 ret = lttng_dynamic_buffer_append(&payload, chunk_name, chunk_name_length);
1382                 if (ret) {
1383                         goto end;
1384                 }
1385         }
1386
1387         ret = send_command(sock, RELAYD_CREATE_TRACE_CHUNK, payload.data, payload.size, 0);
1388         if (ret < 0) {
1389                 ERR("Failed to send trace chunk creation command to relay daemon");
1390                 goto end;
1391         }
1392
1393         ret = recv_reply(sock, &reply, sizeof(reply));
1394         if (ret < 0) {
1395                 ERR("Failed to receive relay daemon trace chunk creation command reply");
1396                 goto end;
1397         }
1398
1399         reply.ret_code = be32toh(reply.ret_code);
1400         if (reply.ret_code != LTTNG_OK) {
1401                 ret = -1;
1402                 ERR("Relayd trace chunk create replied error %d", reply.ret_code);
1403         } else {
1404                 ret = 0;
1405                 DBG("Relayd successfully created trace chunk: chunk_id = %" PRIu64, chunk_id);
1406         }
1407
1408 end:
1409         lttng_dynamic_buffer_reset(&payload);
1410         return ret;
1411 }
1412
1413 int relayd_close_trace_chunk(struct lttcomm_relayd_sock *sock,
1414                              struct lttng_trace_chunk *chunk,
1415                              char *path)
1416 {
1417         int ret = 0;
1418         enum lttng_trace_chunk_status status;
1419         struct lttcomm_relayd_close_trace_chunk msg = {};
1420         struct lttcomm_relayd_close_trace_chunk_reply reply = {};
1421         uint64_t chunk_id;
1422         time_t close_timestamp;
1423         LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command = {};
1424
1425         if (!relayd_supports_chunks(sock)) {
1426                 DBG("Refusing to close remote trace chunk: relayd does not support chunks");
1427                 goto end;
1428         }
1429
1430         status = lttng_trace_chunk_get_id(chunk, &chunk_id);
1431         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1432                 ERR("Failed to get trace chunk id");
1433                 ret = -1;
1434                 goto end;
1435         }
1436
1437         status = lttng_trace_chunk_get_close_timestamp(chunk, &close_timestamp);
1438         if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1439                 ERR("Failed to get trace chunk close timestamp");
1440                 ret = -1;
1441                 goto end;
1442         }
1443
1444         status = lttng_trace_chunk_get_close_command(chunk, &close_command.value);
1445         switch (status) {
1446         case LTTNG_TRACE_CHUNK_STATUS_OK:
1447                 close_command.is_set = 1;
1448                 break;
1449         case LTTNG_TRACE_CHUNK_STATUS_NONE:
1450                 break;
1451         default:
1452                 ERR("Failed to get trace chunk close command");
1453                 ret = -1;
1454                 goto end;
1455         }
1456
1457         msg = (typeof(msg)){
1458                 .chunk_id = htobe64(chunk_id),
1459                 .close_timestamp = htobe64((uint64_t) close_timestamp),
1460                 .close_command = {
1461                         .is_set = close_command.is_set,
1462                         .value = htobe32((uint32_t) close_command.value),
1463                 },
1464         };
1465
1466         ret = send_command(sock, RELAYD_CLOSE_TRACE_CHUNK, &msg, sizeof(msg), 0);
1467         if (ret < 0) {
1468                 ERR("Failed to send trace chunk close command to relay daemon");
1469                 goto end;
1470         }
1471
1472         ret = recv_reply(sock, &reply, sizeof(reply));
1473         if (ret < 0) {
1474                 ERR("Failed to receive relay daemon trace chunk close command reply");
1475                 goto end;
1476         }
1477
1478         reply.path_length = be32toh(reply.path_length);
1479         if (reply.path_length >= LTTNG_PATH_MAX) {
1480                 ERR("Chunk path too long");
1481                 ret = -1;
1482                 goto end;
1483         }
1484
1485         ret = recv_reply(sock, path, reply.path_length);
1486         if (ret < 0) {
1487                 ERR("Failed to receive relay daemon trace chunk close command reply");
1488                 goto end;
1489         }
1490         if (path[reply.path_length - 1] != '\0') {
1491                 ERR("Invalid trace chunk path returned by relay daemon (not null-terminated)");
1492                 ret = -1;
1493                 goto end;
1494         }
1495
1496         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1497         if (reply.generic.ret_code != LTTNG_OK) {
1498                 ret = -1;
1499                 ERR("Relayd trace chunk close replied error %d", reply.generic.ret_code);
1500         } else {
1501                 ret = 0;
1502                 DBG("Relayd successfully closed trace chunk: chunk_id = %" PRIu64, chunk_id);
1503         }
1504 end:
1505         return ret;
1506 }
1507
1508 int relayd_trace_chunk_exists(struct lttcomm_relayd_sock *sock,
1509                               uint64_t chunk_id,
1510                               bool *chunk_exists)
1511 {
1512         int ret = 0;
1513         struct lttcomm_relayd_trace_chunk_exists msg = {};
1514         struct lttcomm_relayd_trace_chunk_exists_reply reply = {};
1515
1516         if (!relayd_supports_chunks(sock)) {
1517                 DBG("Refusing to check for trace chunk existence: relayd does not support chunks");
1518                 /* The chunk will never exist */
1519                 *chunk_exists = false;
1520                 goto end;
1521         }
1522
1523         msg = (typeof(msg)){
1524                 .chunk_id = htobe64(chunk_id),
1525         };
1526
1527         ret = send_command(sock, RELAYD_TRACE_CHUNK_EXISTS, &msg, sizeof(msg), 0);
1528         if (ret < 0) {
1529                 ERR("Failed to send trace chunk exists command to relay daemon");
1530                 goto end;
1531         }
1532
1533         ret = recv_reply(sock, &reply, sizeof(reply));
1534         if (ret < 0) {
1535                 ERR("Failed to receive relay daemon trace chunk close command reply");
1536                 goto end;
1537         }
1538
1539         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1540         if (reply.generic.ret_code != LTTNG_OK) {
1541                 ret = -1;
1542                 ERR("Relayd trace chunk close replied error %d", reply.generic.ret_code);
1543         } else {
1544                 ret = 0;
1545                 DBG("Relayd successfully checked trace chunk existence: chunk_id = %" PRIu64
1546                     ", exists = %s",
1547                     chunk_id,
1548                     reply.trace_chunk_exists ? "true" : "false");
1549                 *chunk_exists = !!reply.trace_chunk_exists;
1550         }
1551 end:
1552         return ret;
1553 }
1554
1555 int relayd_get_configuration(struct lttcomm_relayd_sock *sock,
1556                              uint64_t query_flags,
1557                              uint64_t *result_flags)
1558 {
1559         int ret = 0;
1560         struct lttcomm_relayd_get_configuration msg = (typeof(msg)){
1561                 .query_flags = htobe64(query_flags),
1562         };
1563         struct lttcomm_relayd_get_configuration_reply reply = {};
1564
1565         if (!relayd_supports_get_configuration(sock)) {
1566                 DBG("Refusing to get relayd configuration (unsupported by relayd)");
1567                 if (query_flags) {
1568                         ret = -1;
1569                         goto end;
1570                 }
1571                 *result_flags = 0;
1572                 goto end;
1573         }
1574
1575         ret = send_command(sock, RELAYD_GET_CONFIGURATION, &msg, sizeof(msg), 0);
1576         if (ret < 0) {
1577                 ERR("Failed to send get configuration command to relay daemon");
1578                 goto end;
1579         }
1580
1581         ret = recv_reply(sock, &reply, sizeof(reply));
1582         if (ret < 0) {
1583                 ERR("Failed to receive relay daemon get configuration command reply");
1584                 goto end;
1585         }
1586
1587         reply.generic.ret_code = be32toh(reply.generic.ret_code);
1588         if (reply.generic.ret_code != LTTNG_OK) {
1589                 ret = -1;
1590                 ERR("Relayd get configuration replied error %d", reply.generic.ret_code);
1591         } else {
1592                 reply.relayd_configuration_flags = be64toh(reply.relayd_configuration_flags);
1593                 ret = 0;
1594                 DBG("Relayd successfully got configuration: query_flags = %" PRIu64
1595                     ", results_flags = %" PRIu64,
1596                     query_flags,
1597                     reply.relayd_configuration_flags);
1598                 *result_flags = reply.relayd_configuration_flags;
1599         }
1600 end:
1601         return ret;
1602 }