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