src/bin/lttng-sessiond/consumer.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 _GNU_SOURCE
  19 #define _LGPL_SOURCE
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27 #include <inttypes.h>
  28
  29 #include <common/common.h>
  30 #include <common/defaults.h>
  31 #include <common/uri.h>
  32 #include <common/relayd/relayd.h>
  33
  34 #include "consumer.h"
  35 #include "health-sessiond.h"
  36 #include "ust-app.h"
  37 #include "utils.h"
  38
  39 /*
  40  * Send a data payload using a given consumer socket of size len.
  41  *
  42  * The consumer socket lock MUST be acquired before calling this since this
  43  * function can change the fd value.
  44  *
  45  * Return 0 on success else a negative value on error.
  46  */
  47 int consumer_socket_send(struct consumer_socket *socket, void *msg, size_t len)
  48 {
  49         int fd;
  50         ssize_t size;
  51
  52         assert(socket);
  53         assert(socket->fd_ptr);
  54         assert(msg);
  55
  56         /* Consumer socket is invalid. Stopping. */
  57         fd = *socket->fd_ptr;
  58         if (fd < 0) {
  59                 goto error;
  60         }
  61
  62         size = lttcomm_send_unix_sock(fd, msg, len);
  63         if (size < 0) {
  64                 /* The above call will print a PERROR on error. */
  65                 DBG("Error when sending data to consumer on sock %d", fd);
  66                 /*
  67                  * At this point, the socket is not usable anymore thus closing it and
  68                  * setting the file descriptor to -1 so it is not reused.
  69                  */
  70
  71                 /* This call will PERROR on error. */
  72                 (void) lttcomm_close_unix_sock(fd);
  73                 *socket->fd_ptr = -1;
  74                 goto error;
  75         }
  76
  77         return 0;
  78
  79 error:
  80         return -1;
  81 }
  82
  83 /*
  84  * Receive a data payload using a given consumer socket of size len.
  85  *
  86  * The consumer socket lock MUST be acquired before calling this since this
  87  * function can change the fd value.
  88  *
  89  * Return 0 on success else a negative value on error.
  90  */
  91 int consumer_socket_recv(struct consumer_socket *socket, void *msg, size_t len)
  92 {
  93         int fd;
  94         ssize_t size;
  95
  96         assert(socket);
  97         assert(socket->fd_ptr);
  98         assert(msg);
  99
 100         /* Consumer socket is invalid. Stopping. */
 101         fd = *socket->fd_ptr;
 102         if (fd < 0) {
 103                 goto error;
 104         }
 105
 106         size = lttcomm_recv_unix_sock(fd, msg, len);
 107         if (size <= 0) {
 108                 /* The above call will print a PERROR on error. */
 109                 DBG("Error when receiving data from the consumer socket %d", fd);
 110                 /*
 111                  * At this point, the socket is not usable anymore thus closing it and
 112                  * setting the file descriptor to -1 so it is not reused.
 113                  */
 114
 115                 /* This call will PERROR on error. */
 116                 (void) lttcomm_close_unix_sock(fd);
 117                 *socket->fd_ptr = -1;
 118                 goto error;
 119         }
 120
 121         return 0;
 122
 123 error:
 124         return -1;
 125 }
 126
 127 /*
 128  * Receive a reply command status message from the consumer. Consumer socket
 129  * lock MUST be acquired before calling this function.
 130  *
 131  * Return 0 on success, -1 on recv error or a negative lttng error code which
 132  * was possibly returned by the consumer.
 133  */
 134 int consumer_recv_status_reply(struct consumer_socket *sock)
 135 {
 136         int ret;
 137         struct lttcomm_consumer_status_msg reply;
 138
 139         assert(sock);
 140
 141         ret = consumer_socket_recv(sock, &reply, sizeof(reply));
 142         if (ret < 0) {
 143                 goto end;
 144         }
 145
 146         if (reply.ret_code == LTTCOMM_CONSUMERD_SUCCESS) {
 147                 /* All good. */
 148                 ret = 0;
 149         } else {
 150                 ret = -reply.ret_code;
 151                 DBG("Consumer ret code %d", ret);
 152         }
 153
 154 end:
 155         return ret;
 156 }
 157
 158 /*
 159  * Once the ASK_CHANNEL command is sent to the consumer, the channel
 160  * information are sent back. This call receives that data and populates key
 161  * and stream_count.
 162  *
 163  * On success return 0 and both key and stream_count are set. On error, a
 164  * negative value is sent back and both parameters are untouched.
 165  */
 166 int consumer_recv_status_channel(struct consumer_socket *sock,
 167                 uint64_t *key, unsigned int *stream_count)
 168 {
 169         int ret;
 170         struct lttcomm_consumer_status_channel reply;
 171
 172         assert(sock);
 173         assert(stream_count);
 174         assert(key);
 175
 176         ret = consumer_socket_recv(sock, &reply, sizeof(reply));
 177         if (ret < 0) {
 178                 goto end;
 179         }
 180
 181         /* An error is possible so don't touch the key and stream_count. */
 182         if (reply.ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
 183                 ret = -1;
 184                 goto end;
 185         }
 186
 187         *key = reply.key;
 188         *stream_count = reply.stream_count;
 189         ret = 0;
 190
 191 end:
 192         return ret;
 193 }
 194
 195 /*
 196  * Send destroy relayd command to consumer.
 197  *
 198  * On success return positive value. On error, negative value.
 199  */
 200 int consumer_send_destroy_relayd(struct consumer_socket *sock,
 201                 struct consumer_output *consumer)
 202 {
 203         int ret;
 204         struct lttcomm_consumer_msg msg;
 205
 206         assert(consumer);
 207         assert(sock);
 208
 209         DBG2("Sending destroy relayd command to consumer sock %d", *sock->fd_ptr);
 210
 211         memset(&msg, 0, sizeof(msg));
 212         msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD;
 213         msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index;
 214
 215         pthread_mutex_lock(sock->lock);
 216         ret = consumer_socket_send(sock, &msg, sizeof(msg));
 217         if (ret < 0) {
 218                 goto error;
 219         }
 220
 221         /* Don't check the return value. The caller will do it. */
 222         ret = consumer_recv_status_reply(sock);
 223
 224         DBG2("Consumer send destroy relayd command done");
 225
 226 error:
 227         pthread_mutex_unlock(sock->lock);
 228         return ret;
 229 }
 230
 231 /*
 232  * For each consumer socket in the consumer output object, send a destroy
 233  * relayd command.
 234  */
 235 void consumer_output_send_destroy_relayd(struct consumer_output *consumer)
 236 {
 237         struct lttng_ht_iter iter;
 238         struct consumer_socket *socket;
 239
 240         assert(consumer);
 241
 242         /* Destroy any relayd connection */
 243         if (consumer->type == CONSUMER_DST_NET) {
 244                 rcu_read_lock();
 245                 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
 246                                 node.node) {
 247                         int ret;
 248
 249                         /* Send destroy relayd command */
 250                         ret = consumer_send_destroy_relayd(socket, consumer);
 251                         if (ret < 0) {
 252                                 DBG("Unable to send destroy relayd command to consumer");
 253                                 /* Continue since we MUST delete everything at this point. */
 254                         }
 255                 }
 256                 rcu_read_unlock();
 257         }
 258 }
 259
 260 /*
 261  * From a consumer_data structure, allocate and add a consumer socket to the
 262  * consumer output.
 263  *
 264  * Return 0 on success, else negative value on error
 265  */
 266 int consumer_create_socket(struct consumer_data *data,
 267                 struct consumer_output *output)
 268 {
 269         int ret = 0;
 270         struct consumer_socket *socket;
 271
 272         assert(data);
 273
 274         if (output == NULL || data->cmd_sock < 0) {
 275                 /*
 276                  * Not an error. Possible there is simply not spawned consumer or it's
 277                  * disabled for the tracing session asking the socket.
 278                  */
 279                 goto error;
 280         }
 281
 282         rcu_read_lock();
 283         socket = consumer_find_socket(data->cmd_sock, output);
 284         rcu_read_unlock();
 285         if (socket == NULL) {
 286                 socket = consumer_allocate_socket(&data->cmd_sock);
 287                 if (socket == NULL) {
 288                         ret = -1;
 289                         goto error;
 290                 }
 291
 292                 socket->registered = 0;
 293                 socket->lock = &data->lock;
 294                 rcu_read_lock();
 295                 consumer_add_socket(socket, output);
 296                 rcu_read_unlock();
 297         }
 298
 299         socket->type = data->type;
 300
 301         DBG3("Consumer socket created (fd: %d) and added to output",
 302                         data->cmd_sock);
 303
 304 error:
 305         return ret;
 306 }
 307
 308 /*
 309  * Return the consumer socket from the given consumer output with the right
 310  * bitness. On error, returns NULL.
 311  *
 312  * The caller MUST acquire a rcu read side lock and keep it until the socket
 313  * object reference is not needed anymore.
 314  */
 315 struct consumer_socket *consumer_find_socket_by_bitness(int bits,
 316                 struct consumer_output *consumer)
 317 {
 318         int consumer_fd;
 319         struct consumer_socket *socket = NULL;
 320
 321         switch (bits) {
 322         case 64:
 323                 consumer_fd = uatomic_read(&ust_consumerd64_fd);
 324                 break;
 325         case 32:
 326                 consumer_fd = uatomic_read(&ust_consumerd32_fd);
 327                 break;
 328         default:
 329                 assert(0);
 330                 goto end;
 331         }
 332
 333         socket = consumer_find_socket(consumer_fd, consumer);
 334         if (!socket) {
 335                 ERR("Consumer socket fd %d not found in consumer obj %p",
 336                                 consumer_fd, consumer);
 337         }
 338
 339 end:
 340         return socket;
 341 }
 342
 343 /*
 344  * Find a consumer_socket in a consumer_output hashtable. Read side lock must
 345  * be acquired before calling this function and across use of the
 346  * returned consumer_socket.
 347  */
 348 struct consumer_socket *consumer_find_socket(int key,
 349                 struct consumer_output *consumer)
 350 {
 351         struct lttng_ht_iter iter;
 352         struct lttng_ht_node_ulong *node;
 353         struct consumer_socket *socket = NULL;
 354
 355         /* Negative keys are lookup failures */
 356         if (key < 0 || consumer == NULL) {
 357                 return NULL;
 358         }
 359
 360         lttng_ht_lookup(consumer->socks, (void *)((unsigned long) key),
 361                         &iter);
 362         node = lttng_ht_iter_get_node_ulong(&iter);
 363         if (node != NULL) {
 364                 socket = caa_container_of(node, struct consumer_socket, node);
 365         }
 366
 367         return socket;
 368 }
 369
 370 /*
 371  * Allocate a new consumer_socket and return the pointer.
 372  */
 373 struct consumer_socket *consumer_allocate_socket(int *fd)
 374 {
 375         struct consumer_socket *socket = NULL;
 376
 377         assert(fd);
 378
 379         socket = zmalloc(sizeof(struct consumer_socket));
 380         if (socket == NULL) {
 381                 PERROR("zmalloc consumer socket");
 382                 goto error;
 383         }
 384
 385         socket->fd_ptr = fd;
 386         lttng_ht_node_init_ulong(&socket->node, *fd);
 387
 388 error:
 389         return socket;
 390 }
 391
 392 /*
 393  * Add consumer socket to consumer output object. Read side lock must be
 394  * acquired before calling this function.
 395  */
 396 void consumer_add_socket(struct consumer_socket *sock,
 397                 struct consumer_output *consumer)
 398 {
 399         assert(sock);
 400         assert(consumer);
 401
 402         lttng_ht_add_unique_ulong(consumer->socks, &sock->node);
 403 }
 404
 405 /*
 406  * Delte consumer socket to consumer output object. Read side lock must be
 407  * acquired before calling this function.
 408  */
 409 void consumer_del_socket(struct consumer_socket *sock,
 410                 struct consumer_output *consumer)
 411 {
 412         int ret;
 413         struct lttng_ht_iter iter;
 414
 415         assert(sock);
 416         assert(consumer);
 417
 418         iter.iter.node = &sock->node.node;
 419         ret = lttng_ht_del(consumer->socks, &iter);
 420         assert(!ret);
 421 }
 422
 423 /*
 424  * RCU destroy call function.
 425  */
 426 static void destroy_socket_rcu(struct rcu_head *head)
 427 {
 428         struct lttng_ht_node_ulong *node =
 429                 caa_container_of(head, struct lttng_ht_node_ulong, head);
 430         struct consumer_socket *socket =
 431                 caa_container_of(node, struct consumer_socket, node);
 432
 433         free(socket);
 434 }
 435
 436 /*
 437  * Destroy and free socket pointer in a call RCU. Read side lock must be
 438  * acquired before calling this function.
 439  */
 440 void consumer_destroy_socket(struct consumer_socket *sock)
 441 {
 442         assert(sock);
 443
 444         /*
 445          * We DO NOT close the file descriptor here since it is global to the
 446          * session daemon and is closed only if the consumer dies or a custom
 447          * consumer was registered,
 448          */
 449         if (sock->registered) {
 450                 DBG3("Consumer socket was registered. Closing fd %d", *sock->fd_ptr);
 451                 lttcomm_close_unix_sock(*sock->fd_ptr);
 452         }
 453
 454         call_rcu(&sock->node.head, destroy_socket_rcu);
 455 }
 456
 457 /*
 458  * Allocate and assign data to a consumer_output object.
 459  *
 460  * Return pointer to structure.
 461  */
 462 struct consumer_output *consumer_create_output(enum consumer_dst_type type)
 463 {
 464         struct consumer_output *output = NULL;
 465
 466         output = zmalloc(sizeof(struct consumer_output));
 467         if (output == NULL) {
 468                 PERROR("zmalloc consumer_output");
 469                 goto error;
 470         }
 471
 472         /* By default, consumer output is enabled */
 473         output->enabled = 1;
 474         output->type = type;
 475         output->net_seq_index = (uint64_t) -1ULL;
 476         urcu_ref_init(&output->ref);
 477
 478         output->socks = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 479
 480 error:
 481         return output;
 482 }
 483
 484 /*
 485  * Iterate over the consumer output socket hash table and destroy them. The
 486  * socket file descriptor are only closed if the consumer output was
 487  * registered meaning it's an external consumer.
 488  */
 489 void consumer_destroy_output_sockets(struct consumer_output *obj)
 490 {
 491         struct lttng_ht_iter iter;
 492         struct consumer_socket *socket;
 493
 494         if (!obj->socks) {
 495                 return;
 496         }
 497
 498         rcu_read_lock();
 499         cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) {
 500                 consumer_del_socket(socket, obj);
 501                 consumer_destroy_socket(socket);
 502         }
 503         rcu_read_unlock();
 504 }
 505
 506 /*
 507  * Delete the consumer_output object from the list and free the ptr.
 508  *
 509  * Should *NOT* be called with RCU read-side lock held.
 510  */
 511 static void consumer_release_output(struct urcu_ref *ref)
 512 {
 513         struct consumer_output *obj =
 514                 caa_container_of(ref, struct consumer_output, ref);
 515
 516         consumer_destroy_output_sockets(obj);
 517
 518         if (obj->socks) {
 519                 /* Finally destroy HT */
 520                 ht_cleanup_push(obj->socks);
 521         }
 522
 523         free(obj);
 524 }
 525
 526 /*
 527  * Get the consumer_output object.
 528  */
 529 void consumer_output_get(struct consumer_output *obj)
 530 {
 531         urcu_ref_get(&obj->ref);
 532 }
 533
 534 /*
 535  * Put the consumer_output object.
 536  *
 537  * Should *NOT* be called with RCU read-side lock held.
 538  */
 539 void consumer_output_put(struct consumer_output *obj)
 540 {
 541         if (!obj) {
 542                 return;
 543         }
 544         urcu_ref_put(&obj->ref, consumer_release_output);
 545 }
 546
 547 /*
 548  * Copy consumer output and returned the newly allocated copy.
 549  *
 550  * Should *NOT* be called with RCU read-side lock held.
 551  */
 552 struct consumer_output *consumer_copy_output(struct consumer_output *obj)
 553 {
 554         int ret;
 555         struct consumer_output *output;
 556
 557         assert(obj);
 558
 559         output = consumer_create_output(obj->type);
 560         if (output == NULL) {
 561                 goto end;
 562         }
 563         output->enabled = obj->enabled;
 564         output->net_seq_index = obj->net_seq_index;
 565         memcpy(output->subdir, obj->subdir, PATH_MAX);
 566         output->snapshot = obj->snapshot;
 567         memcpy(&output->dst, &obj->dst, sizeof(output->dst));
 568         ret = consumer_copy_sockets(output, obj);
 569         if (ret < 0) {
 570                 goto error_put;
 571         }
 572 end:
 573         return output;
 574
 575 error_put:
 576         consumer_output_put(output);
 577         return NULL;
 578 }
 579
 580 /*
 581  * Copy consumer sockets from src to dst.
 582  *
 583  * Return 0 on success or else a negative value.
 584  */
 585 int consumer_copy_sockets(struct consumer_output *dst,
 586                 struct consumer_output *src)
 587 {
 588         int ret = 0;
 589         struct lttng_ht_iter iter;
 590         struct consumer_socket *socket, *copy_sock;
 591
 592         assert(dst);
 593         assert(src);
 594
 595         rcu_read_lock();
 596         cds_lfht_for_each_entry(src->socks->ht, &iter.iter, socket, node.node) {
 597                 /* Ignore socket that are already there. */
 598                 copy_sock = consumer_find_socket(*socket->fd_ptr, dst);
 599                 if (copy_sock) {
 600                         continue;
 601                 }
 602
 603                 /* Create new socket object. */
 604                 copy_sock = consumer_allocate_socket(socket->fd_ptr);
 605                 if (copy_sock == NULL) {
 606                         rcu_read_unlock();
 607                         ret = -ENOMEM;
 608                         goto error;
 609                 }
 610
 611                 copy_sock->registered = socket->registered;
 612                 /*
 613                  * This is valid because this lock is shared accross all consumer
 614                  * object being the global lock of the consumer data structure of the
 615                  * session daemon.
 616                  */
 617                 copy_sock->lock = socket->lock;
 618                 consumer_add_socket(copy_sock, dst);
 619         }
 620         rcu_read_unlock();
 621
 622 error:
 623         return ret;
 624 }
 625
 626 /*
 627  * Set network URI to the consumer output object.
 628  *
 629  * Return 0 on success. Return 1 if the URI were equal. Else, negative value on
 630  * error.
 631  */
 632 int consumer_set_network_uri(struct consumer_output *obj,
 633                 struct lttng_uri *uri)
 634 {
 635         int ret;
 636         char tmp_path[PATH_MAX];
 637         char hostname[HOST_NAME_MAX];
 638         struct lttng_uri *dst_uri = NULL;
 639
 640         /* Code flow error safety net. */
 641         assert(obj);
 642         assert(uri);
 643
 644         switch (uri->stype) {
 645         case LTTNG_STREAM_CONTROL:
 646                 dst_uri = &obj->dst.net.control;
 647                 obj->dst.net.control_isset = 1;
 648                 if (uri->port == 0) {
 649                         /* Assign default port. */
 650                         uri->port = DEFAULT_NETWORK_CONTROL_PORT;
 651                 } else {
 652                         if (obj->dst.net.data_isset && uri->port ==
 653                                         obj->dst.net.data.port) {
 654                                 ret = -LTTNG_ERR_INVALID;
 655                                 goto error;
 656                         }
 657                 }
 658                 DBG3("Consumer control URI set with port %d", uri->port);
 659                 break;
 660         case LTTNG_STREAM_DATA:
 661                 dst_uri = &obj->dst.net.data;
 662                 obj->dst.net.data_isset = 1;
 663                 if (uri->port == 0) {
 664                         /* Assign default port. */
 665                         uri->port = DEFAULT_NETWORK_DATA_PORT;
 666                 } else {
 667                         if (obj->dst.net.control_isset && uri->port ==
 668                                         obj->dst.net.control.port) {
 669                                 ret = -LTTNG_ERR_INVALID;
 670                                 goto error;
 671                         }
 672                 }
 673                 DBG3("Consumer data URI set with port %d", uri->port);
 674                 break;
 675         default:
 676                 ERR("Set network uri type unknown %d", uri->stype);
 677                 ret = -LTTNG_ERR_INVALID;
 678                 goto error;
 679         }
 680
 681         ret = uri_compare(dst_uri, uri);
 682         if (!ret) {
 683                 /* Same URI, don't touch it and return success. */
 684                 DBG3("URI network compare are the same");
 685                 goto equal;
 686         }
 687
 688         /* URIs were not equal, replacing it. */
 689         memset(dst_uri, 0, sizeof(struct lttng_uri));
 690         memcpy(dst_uri, uri, sizeof(struct lttng_uri));
 691         obj->type = CONSUMER_DST_NET;
 692
 693         /* Handle subdir and add hostname in front. */
 694         if (dst_uri->stype == LTTNG_STREAM_CONTROL) {
 695                 /* Get hostname to append it in the pathname */
 696                 ret = gethostname(hostname, sizeof(hostname));
 697                 if (ret < 0) {
 698                         PERROR("gethostname. Fallback on default localhost");
 699                         strncpy(hostname, "localhost", sizeof(hostname));
 700                 }
 701                 hostname[sizeof(hostname) - 1] = '\0';
 702
 703                 /* Setup consumer subdir if none present in the control URI */
 704                 if (strlen(dst_uri->subdir) == 0) {
 705                         ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
 706                                         hostname, obj->subdir);
 707                 } else {
 708                         ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
 709                                         hostname, dst_uri->subdir);
 710                 }
 711                 if (ret < 0) {
 712                         PERROR("snprintf set consumer uri subdir");
 713                         ret = -LTTNG_ERR_NOMEM;
 714                         goto error;
 715                 }
 716
 717                 strncpy(obj->subdir, tmp_path, sizeof(obj->subdir));
 718                 DBG3("Consumer set network uri subdir path %s", tmp_path);
 719         }
 720
 721         return 0;
 722 equal:
 723         return 1;
 724 error:
 725         return ret;
 726 }
 727
 728 /*
 729  * Send file descriptor to consumer via sock.
 730  */
 731 int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd)
 732 {
 733         int ret;
 734
 735         assert(fds);
 736         assert(sock);
 737         assert(nb_fd > 0);
 738
 739         ret = lttcomm_send_fds_unix_sock(*sock->fd_ptr, fds, nb_fd);
 740         if (ret < 0) {
 741                 /* The above call will print a PERROR on error. */
 742                 DBG("Error when sending consumer fds on sock %d", *sock->fd_ptr);
 743                 goto error;
 744         }
 745
 746         ret = consumer_recv_status_reply(sock);
 747
 748 error:
 749         return ret;
 750 }
 751
 752 /*
 753  * Consumer send communication message structure to consumer.
 754  */
 755 int consumer_send_msg(struct consumer_socket *sock,
 756                 struct lttcomm_consumer_msg *msg)
 757 {
 758         int ret;
 759
 760         assert(msg);
 761         assert(sock);
 762
 763         ret = consumer_socket_send(sock, msg, sizeof(struct lttcomm_consumer_msg));
 764         if (ret < 0) {
 765                 goto error;
 766         }
 767
 768         ret = consumer_recv_status_reply(sock);
 769
 770 error:
 771         return ret;
 772 }
 773
 774 /*
 775  * Consumer send channel communication message structure to consumer.
 776  */
 777 int consumer_send_channel(struct consumer_socket *sock,
 778                 struct lttcomm_consumer_msg *msg)
 779 {
 780         int ret;
 781
 782         assert(msg);
 783         assert(sock);
 784
 785         ret = consumer_send_msg(sock, msg);
 786         if (ret < 0) {
 787                 goto error;
 788         }
 789
 790 error:
 791         return ret;
 792 }
 793
 794 /*
 795  * Populate the given consumer msg structure with the ask_channel command
 796  * information.
 797  */
 798 void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 799                 uint64_t subbuf_size,
 800                 uint64_t num_subbuf,
 801                 int overwrite,
 802                 unsigned int switch_timer_interval,
 803                 unsigned int read_timer_interval,
 804                 unsigned int live_timer_interval,
 805                 int output,
 806                 int type,
 807                 uint64_t session_id,
 808                 const char *pathname,
 809                 const char *name,
 810                 uid_t uid,
 811                 gid_t gid,
 812                 uint64_t relayd_id,
 813                 uint64_t key,
 814                 unsigned char *uuid,
 815                 uint32_t chan_id,
 816                 uint64_t tracefile_size,
 817                 uint64_t tracefile_count,
 818                 uint64_t session_id_per_pid,
 819                 unsigned int monitor,
 820                 uint32_t ust_app_uid,
 821                 const char *root_shm_path,
 822                 const char *shm_path)
 823 {
 824         assert(msg);
 825
 826         /* Zeroed structure */
 827         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 828
 829         msg->cmd_type = LTTNG_CONSUMER_ASK_CHANNEL_CREATION;
 830         msg->u.ask_channel.subbuf_size = subbuf_size;
 831         msg->u.ask_channel.num_subbuf = num_subbuf ;
 832         msg->u.ask_channel.overwrite = overwrite;
 833         msg->u.ask_channel.switch_timer_interval = switch_timer_interval;
 834         msg->u.ask_channel.read_timer_interval = read_timer_interval;
 835         msg->u.ask_channel.live_timer_interval = live_timer_interval;
 836         msg->u.ask_channel.output = output;
 837         msg->u.ask_channel.type = type;
 838         msg->u.ask_channel.session_id = session_id;
 839         msg->u.ask_channel.session_id_per_pid = session_id_per_pid;
 840         msg->u.ask_channel.uid = uid;
 841         msg->u.ask_channel.gid = gid;
 842         msg->u.ask_channel.relayd_id = relayd_id;
 843         msg->u.ask_channel.key = key;
 844         msg->u.ask_channel.chan_id = chan_id;
 845         msg->u.ask_channel.tracefile_size = tracefile_size;
 846         msg->u.ask_channel.tracefile_count = tracefile_count;
 847         msg->u.ask_channel.monitor = monitor;
 848         msg->u.ask_channel.ust_app_uid = ust_app_uid;
 849
 850         memcpy(msg->u.ask_channel.uuid, uuid, sizeof(msg->u.ask_channel.uuid));
 851
 852         if (pathname) {
 853                 strncpy(msg->u.ask_channel.pathname, pathname,
 854                                 sizeof(msg->u.ask_channel.pathname));
 855                 msg->u.ask_channel.pathname[sizeof(msg->u.ask_channel.pathname)-1] = '\0';
 856         }
 857
 858         strncpy(msg->u.ask_channel.name, name, sizeof(msg->u.ask_channel.name));
 859         msg->u.ask_channel.name[sizeof(msg->u.ask_channel.name) - 1] = '\0';
 860
 861         if (root_shm_path) {
 862                 strncpy(msg->u.ask_channel.root_shm_path, root_shm_path,
 863                         sizeof(msg->u.ask_channel.root_shm_path));
 864                 msg->u.ask_channel.root_shm_path[sizeof(msg->u.ask_channel.root_shm_path) - 1] = '\0';
 865         }
 866         if (shm_path) {
 867                 strncpy(msg->u.ask_channel.shm_path, shm_path,
 868                         sizeof(msg->u.ask_channel.shm_path));
 869                 msg->u.ask_channel.shm_path[sizeof(msg->u.ask_channel.shm_path) - 1] = '\0';
 870         }
 871 }
 872
 873 /*
 874  * Init channel communication message structure.
 875  */
 876 void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 877                 enum lttng_consumer_command cmd,
 878                 uint64_t channel_key,
 879                 uint64_t session_id,
 880                 const char *pathname,
 881                 uid_t uid,
 882                 gid_t gid,
 883                 uint64_t relayd_id,
 884                 const char *name,
 885                 unsigned int nb_init_streams,
 886                 enum lttng_event_output output,
 887                 int type,
 888                 uint64_t tracefile_size,
 889                 uint64_t tracefile_count,
 890                 unsigned int monitor,
 891                 unsigned int live_timer_interval)
 892 {
 893         assert(msg);
 894
 895         /* Zeroed structure */
 896         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 897
 898         /* Send channel */
 899         msg->cmd_type = cmd;
 900         msg->u.channel.channel_key = channel_key;
 901         msg->u.channel.session_id = session_id;
 902         msg->u.channel.uid = uid;
 903         msg->u.channel.gid = gid;
 904         msg->u.channel.relayd_id = relayd_id;
 905         msg->u.channel.nb_init_streams = nb_init_streams;
 906         msg->u.channel.output = output;
 907         msg->u.channel.type = type;
 908         msg->u.channel.tracefile_size = tracefile_size;
 909         msg->u.channel.tracefile_count = tracefile_count;
 910         msg->u.channel.monitor = monitor;
 911         msg->u.channel.live_timer_interval = live_timer_interval;
 912
 913         strncpy(msg->u.channel.pathname, pathname,
 914                         sizeof(msg->u.channel.pathname));
 915         msg->u.channel.pathname[sizeof(msg->u.channel.pathname) - 1] = '\0';
 916
 917         strncpy(msg->u.channel.name, name, sizeof(msg->u.channel.name));
 918         msg->u.channel.name[sizeof(msg->u.channel.name) - 1] = '\0';
 919 }
 920
 921 /*
 922  * Init stream communication message structure.
 923  */
 924 void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
 925                 enum lttng_consumer_command cmd,
 926                 uint64_t channel_key,
 927                 uint64_t stream_key,
 928                 int cpu)
 929 {
 930         assert(msg);
 931
 932         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 933
 934         msg->cmd_type = cmd;
 935         msg->u.stream.channel_key = channel_key;
 936         msg->u.stream.stream_key = stream_key;
 937         msg->u.stream.cpu = cpu;
 938 }
 939
 940 void consumer_init_streams_sent_comm_msg(struct lttcomm_consumer_msg *msg,
 941                 enum lttng_consumer_command cmd,
 942                 uint64_t channel_key, uint64_t net_seq_idx)
 943 {
 944         assert(msg);
 945
 946         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 947
 948         msg->cmd_type = cmd;
 949         msg->u.sent_streams.channel_key = channel_key;
 950         msg->u.sent_streams.net_seq_idx = net_seq_idx;
 951 }
 952
 953 /*
 954  * Send stream communication structure to the consumer.
 955  */
 956 int consumer_send_stream(struct consumer_socket *sock,
 957                 struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
 958                 int *fds, size_t nb_fd)
 959 {
 960         int ret;
 961
 962         assert(msg);
 963         assert(dst);
 964         assert(sock);
 965         assert(fds);
 966
 967         ret = consumer_send_msg(sock, msg);
 968         if (ret < 0) {
 969                 goto error;
 970         }
 971
 972         ret = consumer_send_fds(sock, fds, nb_fd);
 973         if (ret < 0) {
 974                 goto error;
 975         }
 976
 977 error:
 978         return ret;
 979 }
 980
 981 /*
 982  * Send relayd socket to consumer associated with a session name.
 983  *
 984  * On success return positive value. On error, negative value.
 985  */
 986 int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
 987                 struct lttcomm_relayd_sock *rsock, struct consumer_output *consumer,
 988                 enum lttng_stream_type type, uint64_t session_id,
 989                 char *session_name, char *hostname, int session_live_timer)
 990 {
 991         int ret;
 992         struct lttcomm_consumer_msg msg;
 993
 994         /* Code flow error. Safety net. */
 995         assert(rsock);
 996         assert(consumer);
 997         assert(consumer_sock);
 998
 999         memset(&msg, 0, sizeof(msg));
1000         /* Bail out if consumer is disabled */
1001         if (!consumer->enabled) {
1002                 ret = LTTNG_OK;
1003                 goto error;
1004         }
1005
1006         if (type == LTTNG_STREAM_CONTROL) {
1007                 ret = relayd_create_session(rsock,
1008                                 &msg.u.relayd_sock.relayd_session_id,
1009                                 session_name, hostname, session_live_timer,
1010                                 consumer->snapshot);
1011                 if (ret < 0) {
1012                         /* Close the control socket. */
1013                         (void) relayd_close(rsock);
1014                         goto error;
1015                 }
1016         }
1017
1018         msg.cmd_type = LTTNG_CONSUMER_ADD_RELAYD_SOCKET;
1019         /*
1020          * Assign network consumer output index using the temporary consumer since
1021          * this call should only be made from within a set_consumer_uri() function
1022          * call in the session daemon.
1023          */
1024         msg.u.relayd_sock.net_index = consumer->net_seq_index;
1025         msg.u.relayd_sock.type = type;
1026         msg.u.relayd_sock.session_id = session_id;
1027         memcpy(&msg.u.relayd_sock.sock, rsock, sizeof(msg.u.relayd_sock.sock));
1028
1029         DBG3("Sending relayd sock info to consumer on %d", *consumer_sock->fd_ptr);
1030         ret = consumer_send_msg(consumer_sock, &msg);
1031         if (ret < 0) {
1032                 goto error;
1033         }
1034
1035         DBG3("Sending relayd socket file descriptor to consumer");
1036         ret = consumer_send_fds(consumer_sock, &rsock->sock.fd, 1);
1037         if (ret < 0) {
1038                 goto error;
1039         }
1040
1041         DBG2("Consumer relayd socket sent");
1042
1043 error:
1044         return ret;
1045 }
1046
1047 /*
1048  * Set consumer subdirectory using the session name and a generated datetime if
1049  * needed. This is appended to the current subdirectory.
1050  */
1051 int consumer_set_subdir(struct consumer_output *consumer,
1052                 const char *session_name)
1053 {
1054         int ret = 0;
1055         unsigned int have_default_name = 0;
1056         char datetime[16], tmp_path[PATH_MAX];
1057         time_t rawtime;
1058         struct tm *timeinfo;
1059
1060         assert(consumer);
1061         assert(session_name);
1062
1063         memset(tmp_path, 0, sizeof(tmp_path));
1064
1065         /* Flag if we have a default session. */
1066         if (strncmp(session_name, DEFAULT_SESSION_NAME "-",
1067                                 strlen(DEFAULT_SESSION_NAME) + 1) == 0) {
1068                 have_default_name = 1;
1069         } else {
1070                 /* Get date and time for session path */
1071                 time(&rawtime);
1072                 timeinfo = localtime(&rawtime);
1073                 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
1074         }
1075
1076         if (have_default_name) {
1077                 ret = snprintf(tmp_path, sizeof(tmp_path),
1078                                 "%s/%s", consumer->subdir, session_name);
1079         } else {
1080                 ret = snprintf(tmp_path, sizeof(tmp_path),
1081                                 "%s/%s-%s/", consumer->subdir, session_name, datetime);
1082         }
1083         if (ret < 0) {
1084                 PERROR("snprintf session name date");
1085                 goto error;
1086         }
1087
1088         strncpy(consumer->subdir, tmp_path, sizeof(consumer->subdir));
1089         DBG2("Consumer subdir set to %s", consumer->subdir);
1090
1091 error:
1092         return ret;
1093 }
1094
1095 /*
1096  * Ask the consumer if the data is pending for the specific session id.
1097  * Returns 1 if data is pending, 0 otherwise, or < 0 on error.
1098  */
1099 int consumer_is_data_pending(uint64_t session_id,
1100                 struct consumer_output *consumer)
1101 {
1102         int ret;
1103         int32_t ret_code = 0;  /* Default is that the data is NOT pending */
1104         struct consumer_socket *socket;
1105         struct lttng_ht_iter iter;
1106         struct lttcomm_consumer_msg msg;
1107
1108         assert(consumer);
1109
1110         DBG3("Consumer data pending for id %" PRIu64, session_id);
1111
1112         memset(&msg, 0, sizeof(msg));
1113         msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
1114         msg.u.data_pending.session_id = session_id;
1115
1116         /* Send command for each consumer */
1117         rcu_read_lock();
1118         cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
1119                         node.node) {
1120                 pthread_mutex_lock(socket->lock);
1121                 ret = consumer_socket_send(socket, &msg, sizeof(msg));
1122                 if (ret < 0) {
1123                         pthread_mutex_unlock(socket->lock);
1124                         goto error_unlock;
1125                 }
1126
1127                 /*
1128                  * No need for a recv reply status because the answer to the command is
1129                  * the reply status message.
1130                  */
1131
1132                 ret = consumer_socket_recv(socket, &ret_code, sizeof(ret_code));
1133                 if (ret < 0) {
1134                         pthread_mutex_unlock(socket->lock);
1135                         goto error_unlock;
1136                 }
1137                 pthread_mutex_unlock(socket->lock);
1138
1139                 if (ret_code == 1) {
1140                         break;
1141                 }
1142         }
1143         rcu_read_unlock();
1144
1145         DBG("Consumer data is %s pending for session id %" PRIu64,
1146                         ret_code == 1 ? "" : "NOT", session_id);
1147         return ret_code;
1148
1149 error_unlock:
1150         rcu_read_unlock();
1151         return -1;
1152 }
1153
1154 /*
1155  * Send a flush command to consumer using the given channel key.
1156  *
1157  * Return 0 on success else a negative value.
1158  */
1159 int consumer_flush_channel(struct consumer_socket *socket, uint64_t key)
1160 {
1161         int ret;
1162         struct lttcomm_consumer_msg msg;
1163
1164         assert(socket);
1165
1166         DBG2("Consumer flush channel key %" PRIu64, key);
1167
1168         memset(&msg, 0, sizeof(msg));
1169         msg.cmd_type = LTTNG_CONSUMER_FLUSH_CHANNEL;
1170         msg.u.flush_channel.key = key;
1171
1172         pthread_mutex_lock(socket->lock);
1173         health_code_update();
1174
1175         ret = consumer_send_msg(socket, &msg);
1176         if (ret < 0) {
1177                 goto end;
1178         }
1179
1180 end:
1181         health_code_update();
1182         pthread_mutex_unlock(socket->lock);
1183         return ret;
1184 }
1185
1186 /*
1187  * Send a close metadata command to consumer using the given channel key.
1188  * Called with registry lock held.
1189  *
1190  * Return 0 on success else a negative value.
1191  */
1192 int consumer_close_metadata(struct consumer_socket *socket,
1193                 uint64_t metadata_key)
1194 {
1195         int ret;
1196         struct lttcomm_consumer_msg msg;
1197
1198         assert(socket);
1199
1200         DBG2("Consumer close metadata channel key %" PRIu64, metadata_key);
1201
1202         memset(&msg, 0, sizeof(msg));
1203         msg.cmd_type = LTTNG_CONSUMER_CLOSE_METADATA;
1204         msg.u.close_metadata.key = metadata_key;
1205
1206         pthread_mutex_lock(socket->lock);
1207         health_code_update();
1208
1209         ret = consumer_send_msg(socket, &msg);
1210         if (ret < 0) {
1211                 goto end;
1212         }
1213
1214 end:
1215         health_code_update();
1216         pthread_mutex_unlock(socket->lock);
1217         return ret;
1218 }
1219
1220 /*
1221  * Send a setup metdata command to consumer using the given channel key.
1222  *
1223  * Return 0 on success else a negative value.
1224  */
1225 int consumer_setup_metadata(struct consumer_socket *socket,
1226                 uint64_t metadata_key)
1227 {
1228         int ret;
1229         struct lttcomm_consumer_msg msg;
1230
1231         assert(socket);
1232
1233         DBG2("Consumer setup metadata channel key %" PRIu64, metadata_key);
1234
1235         memset(&msg, 0, sizeof(msg));
1236         msg.cmd_type = LTTNG_CONSUMER_SETUP_METADATA;
1237         msg.u.setup_metadata.key = metadata_key;
1238
1239         pthread_mutex_lock(socket->lock);
1240         health_code_update();
1241
1242         ret = consumer_send_msg(socket, &msg);
1243         if (ret < 0) {
1244                 goto end;
1245         }
1246
1247 end:
1248         health_code_update();
1249         pthread_mutex_unlock(socket->lock);
1250         return ret;
1251 }
1252
1253 /*
1254  * Send metadata string to consumer.
1255  * RCU read-side lock must be held to guarantee existence of socket.
1256  *
1257  * Return 0 on success else a negative value.
1258  */
1259 int consumer_push_metadata(struct consumer_socket *socket,
1260                 uint64_t metadata_key, char *metadata_str, size_t len,
1261                 size_t target_offset)
1262 {
1263         int ret;
1264         struct lttcomm_consumer_msg msg;
1265
1266         assert(socket);
1267
1268         DBG2("Consumer push metadata to consumer socket %d", *socket->fd_ptr);
1269
1270         pthread_mutex_lock(socket->lock);
1271
1272         memset(&msg, 0, sizeof(msg));
1273         msg.cmd_type = LTTNG_CONSUMER_PUSH_METADATA;
1274         msg.u.push_metadata.key = metadata_key;
1275         msg.u.push_metadata.target_offset = target_offset;
1276         msg.u.push_metadata.len = len;
1277
1278         health_code_update();
1279         ret = consumer_send_msg(socket, &msg);
1280         if (ret < 0 || len == 0) {
1281                 goto end;
1282         }
1283
1284         DBG3("Consumer pushing metadata on sock %d of len %zu", *socket->fd_ptr,
1285                         len);
1286
1287         ret = consumer_socket_send(socket, metadata_str, len);
1288         if (ret < 0) {
1289                 goto end;
1290         }
1291
1292         health_code_update();
1293         ret = consumer_recv_status_reply(socket);
1294         if (ret < 0) {
1295                 goto end;
1296         }
1297
1298 end:
1299         pthread_mutex_unlock(socket->lock);
1300         health_code_update();
1301         return ret;
1302 }
1303
1304 /*
1305  * Ask the consumer to snapshot a specific channel using the key.
1306  *
1307  * Return 0 on success or else a negative error.
1308  */
1309 int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
1310                 struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
1311                 const char *session_path, int wait, uint64_t nb_packets_per_stream)
1312 {
1313         int ret;
1314         struct lttcomm_consumer_msg msg;
1315
1316         assert(socket);
1317         assert(output);
1318         assert(output->consumer);
1319
1320         DBG("Consumer snapshot channel key %" PRIu64, key);
1321
1322         memset(&msg, 0, sizeof(msg));
1323         msg.cmd_type = LTTNG_CONSUMER_SNAPSHOT_CHANNEL;
1324         msg.u.snapshot_channel.key = key;
1325         msg.u.snapshot_channel.nb_packets_per_stream = nb_packets_per_stream;
1326         msg.u.snapshot_channel.metadata = metadata;
1327
1328         if (output->consumer->type == CONSUMER_DST_NET) {
1329                 msg.u.snapshot_channel.relayd_id = output->consumer->net_seq_index;
1330                 msg.u.snapshot_channel.use_relayd = 1;
1331                 ret = snprintf(msg.u.snapshot_channel.pathname,
1332                                 sizeof(msg.u.snapshot_channel.pathname),
1333                                 "%s/%s-%s-%" PRIu64 "%s", output->consumer->subdir,
1334                                 output->name, output->datetime, output->nb_snapshot,
1335                                 session_path);
1336                 if (ret < 0) {
1337                         ret = -LTTNG_ERR_NOMEM;
1338                         goto error;
1339                 }
1340         } else {
1341                 ret = snprintf(msg.u.snapshot_channel.pathname,
1342                                 sizeof(msg.u.snapshot_channel.pathname),
1343                                 "%s/%s-%s-%" PRIu64 "%s", output->consumer->dst.trace_path,
1344                                 output->name, output->datetime, output->nb_snapshot,
1345                                 session_path);
1346                 if (ret < 0) {
1347                         ret = -LTTNG_ERR_NOMEM;
1348                         goto error;
1349                 }
1350                 msg.u.snapshot_channel.relayd_id = (uint64_t) -1ULL;
1351
1352                 /* Create directory. Ignore if exist. */
1353                 ret = run_as_mkdir_recursive(msg.u.snapshot_channel.pathname,
1354                                 S_IRWXU | S_IRWXG, uid, gid);
1355                 if (ret < 0) {
1356                         if (ret != -EEXIST) {
1357                                 ERR("Trace directory creation error");
1358                                 goto error;
1359                         }
1360                 }
1361         }
1362
1363         health_code_update();
1364         ret = consumer_send_msg(socket, &msg);
1365         if (ret < 0) {
1366                 goto error;
1367         }
1368
1369 error:
1370         health_code_update();
1371         return ret;
1372 }