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
 477         output->socks = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 478
 479 error:
 480         return output;
 481 }
 482
 483 /*
 484  * Iterate over the consumer output socket hash table and destroy them. The
 485  * socket file descriptor are only closed if the consumer output was
 486  * registered meaning it's an external consumer.
 487  */
 488 void consumer_destroy_output_sockets(struct consumer_output *obj)
 489 {
 490         struct lttng_ht_iter iter;
 491         struct consumer_socket *socket;
 492
 493         if (!obj->socks) {
 494                 return;
 495         }
 496
 497         rcu_read_lock();
 498         cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) {
 499                 consumer_del_socket(socket, obj);
 500                 consumer_destroy_socket(socket);
 501         }
 502         rcu_read_unlock();
 503 }
 504
 505 /*
 506  * Delete the consumer_output object from the list and free the ptr.
 507  *
 508  * Should *NOT* be called with RCU read-side lock held.
 509  */
 510 void consumer_destroy_output(struct consumer_output *obj)
 511 {
 512         if (obj == NULL) {
 513                 return;
 514         }
 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  * Copy consumer output and returned the newly allocated copy.
 528  *
 529  * Should *NOT* be called with RCU read-side lock held.
 530  */
 531 struct consumer_output *consumer_copy_output(struct consumer_output *obj)
 532 {
 533         int ret;
 534         struct lttng_ht *tmp_ht_ptr;
 535         struct consumer_output *output;
 536
 537         assert(obj);
 538
 539         output = consumer_create_output(obj->type);
 540         if (output == NULL) {
 541                 goto error;
 542         }
 543         /* Avoid losing the HT reference after the memcpy() */
 544         tmp_ht_ptr = output->socks;
 545
 546         memcpy(output, obj, sizeof(struct consumer_output));
 547
 548         /* Putting back the HT pointer and start copying socket(s). */
 549         output->socks = tmp_ht_ptr;
 550
 551         ret = consumer_copy_sockets(output, obj);
 552         if (ret < 0) {
 553                 goto malloc_error;
 554         }
 555
 556 error:
 557         return output;
 558
 559 malloc_error:
 560         consumer_destroy_output(output);
 561         return NULL;
 562 }
 563
 564 /*
 565  * Copy consumer sockets from src to dst.
 566  *
 567  * Return 0 on success or else a negative value.
 568  */
 569 int consumer_copy_sockets(struct consumer_output *dst,
 570                 struct consumer_output *src)
 571 {
 572         int ret = 0;
 573         struct lttng_ht_iter iter;
 574         struct consumer_socket *socket, *copy_sock;
 575
 576         assert(dst);
 577         assert(src);
 578
 579         rcu_read_lock();
 580         cds_lfht_for_each_entry(src->socks->ht, &iter.iter, socket, node.node) {
 581                 /* Ignore socket that are already there. */
 582                 copy_sock = consumer_find_socket(*socket->fd_ptr, dst);
 583                 if (copy_sock) {
 584                         continue;
 585                 }
 586
 587                 /* Create new socket object. */
 588                 copy_sock = consumer_allocate_socket(socket->fd_ptr);
 589                 if (copy_sock == NULL) {
 590                         rcu_read_unlock();
 591                         ret = -ENOMEM;
 592                         goto error;
 593                 }
 594
 595                 copy_sock->registered = socket->registered;
 596                 /*
 597                  * This is valid because this lock is shared accross all consumer
 598                  * object being the global lock of the consumer data structure of the
 599                  * session daemon.
 600                  */
 601                 copy_sock->lock = socket->lock;
 602                 consumer_add_socket(copy_sock, dst);
 603         }
 604         rcu_read_unlock();
 605
 606 error:
 607         return ret;
 608 }
 609
 610 /*
 611  * Set network URI to the consumer output object.
 612  *
 613  * Return 0 on success. Return 1 if the URI were equal. Else, negative value on
 614  * error.
 615  */
 616 int consumer_set_network_uri(struct consumer_output *obj,
 617                 struct lttng_uri *uri)
 618 {
 619         int ret;
 620         char tmp_path[PATH_MAX];
 621         char hostname[HOST_NAME_MAX];
 622         struct lttng_uri *dst_uri = NULL;
 623
 624         /* Code flow error safety net. */
 625         assert(obj);
 626         assert(uri);
 627
 628         switch (uri->stype) {
 629         case LTTNG_STREAM_CONTROL:
 630                 dst_uri = &obj->dst.net.control;
 631                 obj->dst.net.control_isset = 1;
 632                 if (uri->port == 0) {
 633                         /* Assign default port. */
 634                         uri->port = DEFAULT_NETWORK_CONTROL_PORT;
 635                 } else {
 636                         if (obj->dst.net.data_isset && uri->port ==
 637                                         obj->dst.net.data.port) {
 638                                 ret = -LTTNG_ERR_INVALID;
 639                                 goto error;
 640                         }
 641                 }
 642                 DBG3("Consumer control URI set with port %d", uri->port);
 643                 break;
 644         case LTTNG_STREAM_DATA:
 645                 dst_uri = &obj->dst.net.data;
 646                 obj->dst.net.data_isset = 1;
 647                 if (uri->port == 0) {
 648                         /* Assign default port. */
 649                         uri->port = DEFAULT_NETWORK_DATA_PORT;
 650                 } else {
 651                         if (obj->dst.net.control_isset && uri->port ==
 652                                         obj->dst.net.control.port) {
 653                                 ret = -LTTNG_ERR_INVALID;
 654                                 goto error;
 655                         }
 656                 }
 657                 DBG3("Consumer data URI set with port %d", uri->port);
 658                 break;
 659         default:
 660                 ERR("Set network uri type unknown %d", uri->stype);
 661                 ret = -LTTNG_ERR_INVALID;
 662                 goto error;
 663         }
 664
 665         ret = uri_compare(dst_uri, uri);
 666         if (!ret) {
 667                 /* Same URI, don't touch it and return success. */
 668                 DBG3("URI network compare are the same");
 669                 goto equal;
 670         }
 671
 672         /* URIs were not equal, replacing it. */
 673         memset(dst_uri, 0, sizeof(struct lttng_uri));
 674         memcpy(dst_uri, uri, sizeof(struct lttng_uri));
 675         obj->type = CONSUMER_DST_NET;
 676
 677         /* Handle subdir and add hostname in front. */
 678         if (dst_uri->stype == LTTNG_STREAM_CONTROL) {
 679                 /* Get hostname to append it in the pathname */
 680                 ret = gethostname(hostname, sizeof(hostname));
 681                 if (ret < 0) {
 682                         PERROR("gethostname. Fallback on default localhost");
 683                         strncpy(hostname, "localhost", sizeof(hostname));
 684                 }
 685                 hostname[sizeof(hostname) - 1] = '\0';
 686
 687                 /* Setup consumer subdir if none present in the control URI */
 688                 if (strlen(dst_uri->subdir) == 0) {
 689                         ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
 690                                         hostname, obj->subdir);
 691                 } else {
 692                         ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
 693                                         hostname, dst_uri->subdir);
 694                 }
 695                 if (ret < 0) {
 696                         PERROR("snprintf set consumer uri subdir");
 697                         ret = -LTTNG_ERR_NOMEM;
 698                         goto error;
 699                 }
 700
 701                 strncpy(obj->subdir, tmp_path, sizeof(obj->subdir));
 702                 DBG3("Consumer set network uri subdir path %s", tmp_path);
 703         }
 704
 705         return 0;
 706 equal:
 707         return 1;
 708 error:
 709         return ret;
 710 }
 711
 712 /*
 713  * Send file descriptor to consumer via sock.
 714  */
 715 int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd)
 716 {
 717         int ret;
 718
 719         assert(fds);
 720         assert(sock);
 721         assert(nb_fd > 0);
 722
 723         ret = lttcomm_send_fds_unix_sock(*sock->fd_ptr, fds, nb_fd);
 724         if (ret < 0) {
 725                 /* The above call will print a PERROR on error. */
 726                 DBG("Error when sending consumer fds on sock %d", *sock->fd_ptr);
 727                 goto error;
 728         }
 729
 730         ret = consumer_recv_status_reply(sock);
 731
 732 error:
 733         return ret;
 734 }
 735
 736 /*
 737  * Consumer send communication message structure to consumer.
 738  */
 739 int consumer_send_msg(struct consumer_socket *sock,
 740                 struct lttcomm_consumer_msg *msg)
 741 {
 742         int ret;
 743
 744         assert(msg);
 745         assert(sock);
 746
 747         ret = consumer_socket_send(sock, msg, sizeof(struct lttcomm_consumer_msg));
 748         if (ret < 0) {
 749                 goto error;
 750         }
 751
 752         ret = consumer_recv_status_reply(sock);
 753
 754 error:
 755         return ret;
 756 }
 757
 758 /*
 759  * Consumer send channel communication message structure to consumer.
 760  */
 761 int consumer_send_channel(struct consumer_socket *sock,
 762                 struct lttcomm_consumer_msg *msg)
 763 {
 764         int ret;
 765
 766         assert(msg);
 767         assert(sock);
 768
 769         ret = consumer_send_msg(sock, msg);
 770         if (ret < 0) {
 771                 goto error;
 772         }
 773
 774 error:
 775         return ret;
 776 }
 777
 778 /*
 779  * Populate the given consumer msg structure with the ask_channel command
 780  * information.
 781  */
 782 void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 783                 uint64_t subbuf_size,
 784                 uint64_t num_subbuf,
 785                 int overwrite,
 786                 unsigned int switch_timer_interval,
 787                 unsigned int read_timer_interval,
 788                 unsigned int live_timer_interval,
 789                 int output,
 790                 int type,
 791                 uint64_t session_id,
 792                 const char *pathname,
 793                 const char *name,
 794                 uid_t uid,
 795                 gid_t gid,
 796                 uint64_t relayd_id,
 797                 uint64_t key,
 798                 unsigned char *uuid,
 799                 uint32_t chan_id,
 800                 uint64_t tracefile_size,
 801                 uint64_t tracefile_count,
 802                 uint64_t session_id_per_pid,
 803                 unsigned int monitor,
 804                 uint32_t ust_app_uid)
 805 {
 806         assert(msg);
 807
 808         /* Zeroed structure */
 809         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 810
 811         msg->cmd_type = LTTNG_CONSUMER_ASK_CHANNEL_CREATION;
 812         msg->u.ask_channel.subbuf_size = subbuf_size;
 813         msg->u.ask_channel.num_subbuf = num_subbuf ;
 814         msg->u.ask_channel.overwrite = overwrite;
 815         msg->u.ask_channel.switch_timer_interval = switch_timer_interval;
 816         msg->u.ask_channel.read_timer_interval = read_timer_interval;
 817         msg->u.ask_channel.live_timer_interval = live_timer_interval;
 818         msg->u.ask_channel.output = output;
 819         msg->u.ask_channel.type = type;
 820         msg->u.ask_channel.session_id = session_id;
 821         msg->u.ask_channel.session_id_per_pid = session_id_per_pid;
 822         msg->u.ask_channel.uid = uid;
 823         msg->u.ask_channel.gid = gid;
 824         msg->u.ask_channel.relayd_id = relayd_id;
 825         msg->u.ask_channel.key = key;
 826         msg->u.ask_channel.chan_id = chan_id;
 827         msg->u.ask_channel.tracefile_size = tracefile_size;
 828         msg->u.ask_channel.tracefile_count = tracefile_count;
 829         msg->u.ask_channel.monitor = monitor;
 830         msg->u.ask_channel.ust_app_uid = ust_app_uid;
 831
 832         memcpy(msg->u.ask_channel.uuid, uuid, sizeof(msg->u.ask_channel.uuid));
 833
 834         if (pathname) {
 835                 strncpy(msg->u.ask_channel.pathname, pathname,
 836                                 sizeof(msg->u.ask_channel.pathname));
 837                 msg->u.ask_channel.pathname[sizeof(msg->u.ask_channel.pathname)-1] = '\0';
 838         }
 839
 840         strncpy(msg->u.ask_channel.name, name, sizeof(msg->u.ask_channel.name));
 841         msg->u.ask_channel.name[sizeof(msg->u.ask_channel.name) - 1] = '\0';
 842 }
 843
 844 /*
 845  * Init channel communication message structure.
 846  */
 847 void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 848                 enum lttng_consumer_command cmd,
 849                 uint64_t channel_key,
 850                 uint64_t session_id,
 851                 const char *pathname,
 852                 uid_t uid,
 853                 gid_t gid,
 854                 uint64_t relayd_id,
 855                 const char *name,
 856                 unsigned int nb_init_streams,
 857                 enum lttng_event_output output,
 858                 int type,
 859                 uint64_t tracefile_size,
 860                 uint64_t tracefile_count,
 861                 unsigned int monitor,
 862                 unsigned int live_timer_interval)
 863 {
 864         assert(msg);
 865
 866         /* Zeroed structure */
 867         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 868
 869         /* Send channel */
 870         msg->cmd_type = cmd;
 871         msg->u.channel.channel_key = channel_key;
 872         msg->u.channel.session_id = session_id;
 873         msg->u.channel.uid = uid;
 874         msg->u.channel.gid = gid;
 875         msg->u.channel.relayd_id = relayd_id;
 876         msg->u.channel.nb_init_streams = nb_init_streams;
 877         msg->u.channel.output = output;
 878         msg->u.channel.type = type;
 879         msg->u.channel.tracefile_size = tracefile_size;
 880         msg->u.channel.tracefile_count = tracefile_count;
 881         msg->u.channel.monitor = monitor;
 882         msg->u.channel.live_timer_interval = live_timer_interval;
 883
 884         strncpy(msg->u.channel.pathname, pathname,
 885                         sizeof(msg->u.channel.pathname));
 886         msg->u.channel.pathname[sizeof(msg->u.channel.pathname) - 1] = '\0';
 887
 888         strncpy(msg->u.channel.name, name, sizeof(msg->u.channel.name));
 889         msg->u.channel.name[sizeof(msg->u.channel.name) - 1] = '\0';
 890 }
 891
 892 /*
 893  * Init stream communication message structure.
 894  */
 895 void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
 896                 enum lttng_consumer_command cmd,
 897                 uint64_t channel_key,
 898                 uint64_t stream_key,
 899                 int cpu)
 900 {
 901         assert(msg);
 902
 903         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 904
 905         msg->cmd_type = cmd;
 906         msg->u.stream.channel_key = channel_key;
 907         msg->u.stream.stream_key = stream_key;
 908         msg->u.stream.cpu = cpu;
 909 }
 910
 911 void consumer_init_streams_sent_comm_msg(struct lttcomm_consumer_msg *msg,
 912                 enum lttng_consumer_command cmd,
 913                 uint64_t channel_key, uint64_t net_seq_idx)
 914 {
 915         assert(msg);
 916
 917         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 918
 919         msg->cmd_type = cmd;
 920         msg->u.sent_streams.channel_key = channel_key;
 921         msg->u.sent_streams.net_seq_idx = net_seq_idx;
 922 }
 923
 924 /*
 925  * Send stream communication structure to the consumer.
 926  */
 927 int consumer_send_stream(struct consumer_socket *sock,
 928                 struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
 929                 int *fds, size_t nb_fd)
 930 {
 931         int ret;
 932
 933         assert(msg);
 934         assert(dst);
 935         assert(sock);
 936         assert(fds);
 937
 938         ret = consumer_send_msg(sock, msg);
 939         if (ret < 0) {
 940                 goto error;
 941         }
 942
 943         ret = consumer_send_fds(sock, fds, nb_fd);
 944         if (ret < 0) {
 945                 goto error;
 946         }
 947
 948 error:
 949         return ret;
 950 }
 951
 952 /*
 953  * Send relayd socket to consumer associated with a session name.
 954  *
 955  * On success return positive value. On error, negative value.
 956  */
 957 int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
 958                 struct lttcomm_relayd_sock *rsock, struct consumer_output *consumer,
 959                 enum lttng_stream_type type, uint64_t session_id,
 960                 char *session_name, char *hostname, int session_live_timer)
 961 {
 962         int ret;
 963         struct lttcomm_consumer_msg msg;
 964
 965         /* Code flow error. Safety net. */
 966         assert(rsock);
 967         assert(consumer);
 968         assert(consumer_sock);
 969
 970         memset(&msg, 0, sizeof(msg));
 971         /* Bail out if consumer is disabled */
 972         if (!consumer->enabled) {
 973                 ret = LTTNG_OK;
 974                 goto error;
 975         }
 976
 977         if (type == LTTNG_STREAM_CONTROL) {
 978                 ret = relayd_create_session(rsock,
 979                                 &msg.u.relayd_sock.relayd_session_id,
 980                                 session_name, hostname, session_live_timer,
 981                                 consumer->snapshot);
 982                 if (ret < 0) {
 983                         /* Close the control socket. */
 984                         (void) relayd_close(rsock);
 985                         goto error;
 986                 }
 987         }
 988
 989         msg.cmd_type = LTTNG_CONSUMER_ADD_RELAYD_SOCKET;
 990         /*
 991          * Assign network consumer output index using the temporary consumer since
 992          * this call should only be made from within a set_consumer_uri() function
 993          * call in the session daemon.
 994          */
 995         msg.u.relayd_sock.net_index = consumer->net_seq_index;
 996         msg.u.relayd_sock.type = type;
 997         msg.u.relayd_sock.session_id = session_id;
 998         memcpy(&msg.u.relayd_sock.sock, rsock, sizeof(msg.u.relayd_sock.sock));
 999
1000         DBG3("Sending relayd sock info to consumer on %d", *consumer_sock->fd_ptr);
1001         ret = consumer_send_msg(consumer_sock, &msg);
1002         if (ret < 0) {
1003                 goto error;
1004         }
1005
1006         DBG3("Sending relayd socket file descriptor to consumer");
1007         ret = consumer_send_fds(consumer_sock, &rsock->sock.fd, 1);
1008         if (ret < 0) {
1009                 goto error;
1010         }
1011
1012         DBG2("Consumer relayd socket sent");
1013
1014 error:
1015         return ret;
1016 }
1017
1018 /*
1019  * Set consumer subdirectory using the session name and a generated datetime if
1020  * needed. This is appended to the current subdirectory.
1021  */
1022 int consumer_set_subdir(struct consumer_output *consumer,
1023                 const char *session_name)
1024 {
1025         int ret = 0;
1026         unsigned int have_default_name = 0;
1027         char datetime[16], tmp_path[PATH_MAX];
1028         time_t rawtime;
1029         struct tm *timeinfo;
1030
1031         assert(consumer);
1032         assert(session_name);
1033
1034         memset(tmp_path, 0, sizeof(tmp_path));
1035
1036         /* Flag if we have a default session. */
1037         if (strncmp(session_name, DEFAULT_SESSION_NAME "-",
1038                                 strlen(DEFAULT_SESSION_NAME) + 1) == 0) {
1039                 have_default_name = 1;
1040         } else {
1041                 /* Get date and time for session path */
1042                 time(&rawtime);
1043                 timeinfo = localtime(&rawtime);
1044                 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
1045         }
1046
1047         if (have_default_name) {
1048                 ret = snprintf(tmp_path, sizeof(tmp_path),
1049                                 "%s/%s", consumer->subdir, session_name);
1050         } else {
1051                 ret = snprintf(tmp_path, sizeof(tmp_path),
1052                                 "%s/%s-%s/", consumer->subdir, session_name, datetime);
1053         }
1054         if (ret < 0) {
1055                 PERROR("snprintf session name date");
1056                 goto error;
1057         }
1058
1059         strncpy(consumer->subdir, tmp_path, sizeof(consumer->subdir));
1060         DBG2("Consumer subdir set to %s", consumer->subdir);
1061
1062 error:
1063         return ret;
1064 }
1065
1066 /*
1067  * Ask the consumer if the data is ready to read (NOT pending) for the specific
1068  * session id.
1069  *
1070  * This function has a different behavior with the consumer i.e. that it waits
1071  * for a reply from the consumer if yes or no the data is pending.
1072  */
1073 int consumer_is_data_pending(uint64_t session_id,
1074                 struct consumer_output *consumer)
1075 {
1076         int ret;
1077         int32_t ret_code = 0;  /* Default is that the data is NOT pending */
1078         struct consumer_socket *socket;
1079         struct lttng_ht_iter iter;
1080         struct lttcomm_consumer_msg msg;
1081
1082         assert(consumer);
1083
1084         DBG3("Consumer data pending for id %" PRIu64, session_id);
1085
1086         memset(&msg, 0, sizeof(msg));
1087         msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
1088         msg.u.data_pending.session_id = session_id;
1089
1090         /* Send command for each consumer */
1091         rcu_read_lock();
1092         cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
1093                         node.node) {
1094                 pthread_mutex_lock(socket->lock);
1095                 ret = consumer_socket_send(socket, &msg, sizeof(msg));
1096                 if (ret < 0) {
1097                         pthread_mutex_unlock(socket->lock);
1098                         goto error_unlock;
1099                 }
1100
1101                 /*
1102                  * No need for a recv reply status because the answer to the command is
1103                  * the reply status message.
1104                  */
1105
1106                 ret = consumer_socket_recv(socket, &ret_code, sizeof(ret_code));
1107                 if (ret < 0) {
1108                         pthread_mutex_unlock(socket->lock);
1109                         goto error_unlock;
1110                 }
1111                 pthread_mutex_unlock(socket->lock);
1112
1113                 if (ret_code == 1) {
1114                         break;
1115                 }
1116         }
1117         rcu_read_unlock();
1118
1119         DBG("Consumer data is %s pending for session id %" PRIu64,
1120                         ret_code == 1 ? "" : "NOT", session_id);
1121         return ret_code;
1122
1123 error_unlock:
1124         rcu_read_unlock();
1125         return -1;
1126 }
1127
1128 /*
1129  * Send a flush command to consumer using the given channel key.
1130  *
1131  * Return 0 on success else a negative value.
1132  */
1133 int consumer_flush_channel(struct consumer_socket *socket, uint64_t key)
1134 {
1135         int ret;
1136         struct lttcomm_consumer_msg msg;
1137
1138         assert(socket);
1139
1140         DBG2("Consumer flush channel key %" PRIu64, key);
1141
1142         memset(&msg, 0, sizeof(msg));
1143         msg.cmd_type = LTTNG_CONSUMER_FLUSH_CHANNEL;
1144         msg.u.flush_channel.key = key;
1145
1146         pthread_mutex_lock(socket->lock);
1147         health_code_update();
1148
1149         ret = consumer_send_msg(socket, &msg);
1150         if (ret < 0) {
1151                 goto end;
1152         }
1153
1154 end:
1155         health_code_update();
1156         pthread_mutex_unlock(socket->lock);
1157         return ret;
1158 }
1159
1160 /*
1161  * Send a close metadata command to consumer using the given channel key.
1162  * Called with registry lock held.
1163  *
1164  * Return 0 on success else a negative value.
1165  */
1166 int consumer_close_metadata(struct consumer_socket *socket,
1167                 uint64_t metadata_key)
1168 {
1169         int ret;
1170         struct lttcomm_consumer_msg msg;
1171
1172         assert(socket);
1173
1174         DBG2("Consumer close metadata channel key %" PRIu64, metadata_key);
1175
1176         memset(&msg, 0, sizeof(msg));
1177         msg.cmd_type = LTTNG_CONSUMER_CLOSE_METADATA;
1178         msg.u.close_metadata.key = metadata_key;
1179
1180         pthread_mutex_lock(socket->lock);
1181         health_code_update();
1182
1183         ret = consumer_send_msg(socket, &msg);
1184         if (ret < 0) {
1185                 goto end;
1186         }
1187
1188 end:
1189         health_code_update();
1190         pthread_mutex_unlock(socket->lock);
1191         return ret;
1192 }
1193
1194 /*
1195  * Send a setup metdata command to consumer using the given channel key.
1196  *
1197  * Return 0 on success else a negative value.
1198  */
1199 int consumer_setup_metadata(struct consumer_socket *socket,
1200                 uint64_t metadata_key)
1201 {
1202         int ret;
1203         struct lttcomm_consumer_msg msg;
1204
1205         assert(socket);
1206
1207         DBG2("Consumer setup metadata channel key %" PRIu64, metadata_key);
1208
1209         memset(&msg, 0, sizeof(msg));
1210         msg.cmd_type = LTTNG_CONSUMER_SETUP_METADATA;
1211         msg.u.setup_metadata.key = metadata_key;
1212
1213         pthread_mutex_lock(socket->lock);
1214         health_code_update();
1215
1216         ret = consumer_send_msg(socket, &msg);
1217         if (ret < 0) {
1218                 goto end;
1219         }
1220
1221 end:
1222         health_code_update();
1223         pthread_mutex_unlock(socket->lock);
1224         return ret;
1225 }
1226
1227 /*
1228  * Send metadata string to consumer.
1229  * RCU read-side lock must be held to guarantee existence of socket.
1230  *
1231  * Return 0 on success else a negative value.
1232  */
1233 int consumer_push_metadata(struct consumer_socket *socket,
1234                 uint64_t metadata_key, char *metadata_str, size_t len,
1235                 size_t target_offset)
1236 {
1237         int ret;
1238         struct lttcomm_consumer_msg msg;
1239
1240         assert(socket);
1241
1242         DBG2("Consumer push metadata to consumer socket %d", *socket->fd_ptr);
1243
1244         pthread_mutex_lock(socket->lock);
1245
1246         memset(&msg, 0, sizeof(msg));
1247         msg.cmd_type = LTTNG_CONSUMER_PUSH_METADATA;
1248         msg.u.push_metadata.key = metadata_key;
1249         msg.u.push_metadata.target_offset = target_offset;
1250         msg.u.push_metadata.len = len;
1251
1252         health_code_update();
1253         ret = consumer_send_msg(socket, &msg);
1254         if (ret < 0 || len == 0) {
1255                 goto end;
1256         }
1257
1258         DBG3("Consumer pushing metadata on sock %d of len %zu", *socket->fd_ptr,
1259                         len);
1260
1261         ret = consumer_socket_send(socket, metadata_str, len);
1262         if (ret < 0) {
1263                 goto end;
1264         }
1265
1266         health_code_update();
1267         ret = consumer_recv_status_reply(socket);
1268         if (ret < 0) {
1269                 goto end;
1270         }
1271
1272 end:
1273         pthread_mutex_unlock(socket->lock);
1274         health_code_update();
1275         return ret;
1276 }
1277
1278 /*
1279  * Ask the consumer to snapshot a specific channel using the key.
1280  *
1281  * Return 0 on success or else a negative error.
1282  */
1283 int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
1284                 struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
1285                 const char *session_path, int wait, uint64_t nb_packets_per_stream)
1286 {
1287         int ret;
1288         struct lttcomm_consumer_msg msg;
1289
1290         assert(socket);
1291         assert(output);
1292         assert(output->consumer);
1293
1294         DBG("Consumer snapshot channel key %" PRIu64, key);
1295
1296         memset(&msg, 0, sizeof(msg));
1297         msg.cmd_type = LTTNG_CONSUMER_SNAPSHOT_CHANNEL;
1298         msg.u.snapshot_channel.key = key;
1299         msg.u.snapshot_channel.nb_packets_per_stream = nb_packets_per_stream;
1300         msg.u.snapshot_channel.metadata = metadata;
1301
1302         if (output->consumer->type == CONSUMER_DST_NET) {
1303                 msg.u.snapshot_channel.relayd_id = output->consumer->net_seq_index;
1304                 msg.u.snapshot_channel.use_relayd = 1;
1305                 ret = snprintf(msg.u.snapshot_channel.pathname,
1306                                 sizeof(msg.u.snapshot_channel.pathname),
1307                                 "%s/%s-%s-%" PRIu64 "%s", output->consumer->subdir,
1308                                 output->name, output->datetime, output->nb_snapshot,
1309                                 session_path);
1310                 if (ret < 0) {
1311                         ret = -LTTNG_ERR_NOMEM;
1312                         goto error;
1313                 }
1314         } else {
1315                 ret = snprintf(msg.u.snapshot_channel.pathname,
1316                                 sizeof(msg.u.snapshot_channel.pathname),
1317                                 "%s/%s-%s-%" PRIu64 "%s", output->consumer->dst.trace_path,
1318                                 output->name, output->datetime, output->nb_snapshot,
1319                                 session_path);
1320                 if (ret < 0) {
1321                         ret = -LTTNG_ERR_NOMEM;
1322                         goto error;
1323                 }
1324                 msg.u.snapshot_channel.relayd_id = (uint64_t) -1ULL;
1325
1326                 /* Create directory. Ignore if exist. */
1327                 ret = run_as_mkdir_recursive(msg.u.snapshot_channel.pathname,
1328                                 S_IRWXU | S_IRWXG, uid, gid);
1329                 if (ret < 0) {
1330                         if (ret != -EEXIST) {
1331                                 ERR("Trace directory creation error");
1332                                 goto error;
1333                         }
1334                 }
1335         }
1336
1337         health_code_update();
1338         ret = consumer_send_msg(socket, &msg);
1339         if (ret < 0) {
1340                 goto error;
1341         }
1342
1343 error:
1344         health_code_update();
1345         return ret;
1346 }