| 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 | |
| 27 | #include <common/common.h> |
| 28 | #include <common/defaults.h> |
| 29 | #include <common/uri.h> |
| 30 | |
| 31 | #include "consumer.h" |
| 32 | |
| 33 | /* |
| 34 | * Receive a reply command status message from the consumer. Consumer socket |
| 35 | * lock MUST be acquired before calling this function. |
| 36 | * |
| 37 | * Return 0 on success, -1 on recv error or a negative lttng error code which |
| 38 | * was possibly returned by the consumer. |
| 39 | */ |
| 40 | int consumer_recv_status_reply(struct consumer_socket *sock) |
| 41 | { |
| 42 | int ret; |
| 43 | struct lttcomm_consumer_status_msg reply; |
| 44 | |
| 45 | assert(sock); |
| 46 | |
| 47 | ret = lttcomm_recv_unix_sock(sock->fd, &reply, sizeof(reply)); |
| 48 | if (ret <= 0) { |
| 49 | if (ret == 0) { |
| 50 | /* Orderly shutdown. Don't return 0 which means success. */ |
| 51 | ret = -1; |
| 52 | } |
| 53 | /* The above call will print a PERROR on error. */ |
| 54 | DBG("Fail to receive status reply on sock %d", sock->fd); |
| 55 | goto end; |
| 56 | } |
| 57 | |
| 58 | if (reply.ret_code == LTTNG_OK) { |
| 59 | /* All good. */ |
| 60 | ret = 0; |
| 61 | } else { |
| 62 | ret = -reply.ret_code; |
| 63 | DBG("Consumer ret code %d", ret); |
| 64 | } |
| 65 | |
| 66 | end: |
| 67 | return ret; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * Once the ASK_CHANNEL command is sent to the consumer, the channel |
| 72 | * information are sent back. This call receives that data and populates key |
| 73 | * and stream_count. |
| 74 | * |
| 75 | * On success return 0 and both key and stream_count are set. On error, a |
| 76 | * negative value is sent back and both parameters are untouched. |
| 77 | */ |
| 78 | int consumer_recv_status_channel(struct consumer_socket *sock, |
| 79 | unsigned long *key, unsigned int *stream_count) |
| 80 | { |
| 81 | int ret; |
| 82 | struct lttcomm_consumer_status_channel reply; |
| 83 | |
| 84 | assert(sock); |
| 85 | assert(stream_count); |
| 86 | assert(key); |
| 87 | |
| 88 | ret = lttcomm_recv_unix_sock(sock->fd, &reply, sizeof(reply)); |
| 89 | if (ret <= 0) { |
| 90 | if (ret == 0) { |
| 91 | /* Orderly shutdown. Don't return 0 which means success. */ |
| 92 | ret = -1; |
| 93 | } |
| 94 | /* The above call will print a PERROR on error. */ |
| 95 | DBG("Fail to receive status reply on sock %d", sock->fd); |
| 96 | goto end; |
| 97 | } |
| 98 | |
| 99 | /* An error is possible so don't touch the key and stream_count. */ |
| 100 | if (reply.ret_code != LTTNG_OK) { |
| 101 | ret = -1; |
| 102 | goto end; |
| 103 | } |
| 104 | |
| 105 | *key = reply.key; |
| 106 | *stream_count = reply.stream_count; |
| 107 | |
| 108 | end: |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * Send destroy relayd command to consumer. |
| 114 | * |
| 115 | * On success return positive value. On error, negative value. |
| 116 | */ |
| 117 | int consumer_send_destroy_relayd(struct consumer_socket *sock, |
| 118 | struct consumer_output *consumer) |
| 119 | { |
| 120 | int ret; |
| 121 | struct lttcomm_consumer_msg msg; |
| 122 | |
| 123 | assert(consumer); |
| 124 | assert(sock); |
| 125 | |
| 126 | DBG2("Sending destroy relayd command to consumer sock %d", sock->fd); |
| 127 | |
| 128 | /* Bail out if consumer is disabled */ |
| 129 | if (!consumer->enabled) { |
| 130 | ret = LTTNG_OK; |
| 131 | DBG3("Consumer is disabled"); |
| 132 | goto error; |
| 133 | } |
| 134 | |
| 135 | msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD; |
| 136 | msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index; |
| 137 | |
| 138 | pthread_mutex_lock(sock->lock); |
| 139 | ret = lttcomm_send_unix_sock(sock->fd, &msg, sizeof(msg)); |
| 140 | if (ret < 0) { |
| 141 | /* Indicate that the consumer is probably closing at this point. */ |
| 142 | DBG("send consumer destroy relayd command"); |
| 143 | goto error_send; |
| 144 | } |
| 145 | |
| 146 | /* Don't check the return value. The caller will do it. */ |
| 147 | ret = consumer_recv_status_reply(sock); |
| 148 | |
| 149 | DBG2("Consumer send destroy relayd command done"); |
| 150 | |
| 151 | error_send: |
| 152 | pthread_mutex_unlock(sock->lock); |
| 153 | error: |
| 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * For each consumer socket in the consumer output object, send a destroy |
| 159 | * relayd command. |
| 160 | */ |
| 161 | void consumer_output_send_destroy_relayd(struct consumer_output *consumer) |
| 162 | { |
| 163 | struct lttng_ht_iter iter; |
| 164 | struct consumer_socket *socket; |
| 165 | |
| 166 | assert(consumer); |
| 167 | |
| 168 | /* Destroy any relayd connection */ |
| 169 | if (consumer && consumer->type == CONSUMER_DST_NET) { |
| 170 | rcu_read_lock(); |
| 171 | cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket, |
| 172 | node.node) { |
| 173 | int ret; |
| 174 | |
| 175 | /* Send destroy relayd command */ |
| 176 | ret = consumer_send_destroy_relayd(socket, consumer); |
| 177 | if (ret < 0) { |
| 178 | DBG("Unable to send destroy relayd command to consumer"); |
| 179 | /* Continue since we MUST delete everything at this point. */ |
| 180 | } |
| 181 | } |
| 182 | rcu_read_unlock(); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * From a consumer_data structure, allocate and add a consumer socket to the |
| 188 | * consumer output. |
| 189 | * |
| 190 | * Return 0 on success, else negative value on error |
| 191 | */ |
| 192 | int consumer_create_socket(struct consumer_data *data, |
| 193 | struct consumer_output *output) |
| 194 | { |
| 195 | int ret = 0; |
| 196 | struct consumer_socket *socket; |
| 197 | |
| 198 | assert(data); |
| 199 | |
| 200 | if (output == NULL || data->cmd_sock < 0) { |
| 201 | /* |
| 202 | * Not an error. Possible there is simply not spawned consumer or it's |
| 203 | * disabled for the tracing session asking the socket. |
| 204 | */ |
| 205 | goto error; |
| 206 | } |
| 207 | |
| 208 | rcu_read_lock(); |
| 209 | socket = consumer_find_socket(data->cmd_sock, output); |
| 210 | rcu_read_unlock(); |
| 211 | if (socket == NULL) { |
| 212 | socket = consumer_allocate_socket(data->cmd_sock); |
| 213 | if (socket == NULL) { |
| 214 | ret = -1; |
| 215 | goto error; |
| 216 | } |
| 217 | |
| 218 | socket->registered = 0; |
| 219 | socket->lock = &data->lock; |
| 220 | rcu_read_lock(); |
| 221 | consumer_add_socket(socket, output); |
| 222 | rcu_read_unlock(); |
| 223 | } |
| 224 | |
| 225 | DBG3("Consumer socket created (fd: %d) and added to output", |
| 226 | data->cmd_sock); |
| 227 | |
| 228 | error: |
| 229 | return ret; |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * Find a consumer_socket in a consumer_output hashtable. Read side lock must |
| 234 | * be acquired before calling this function and across use of the |
| 235 | * returned consumer_socket. |
| 236 | */ |
| 237 | struct consumer_socket *consumer_find_socket(int key, |
| 238 | struct consumer_output *consumer) |
| 239 | { |
| 240 | struct lttng_ht_iter iter; |
| 241 | struct lttng_ht_node_ulong *node; |
| 242 | struct consumer_socket *socket = NULL; |
| 243 | |
| 244 | /* Negative keys are lookup failures */ |
| 245 | if (key < 0 || consumer == NULL) { |
| 246 | return NULL; |
| 247 | } |
| 248 | |
| 249 | lttng_ht_lookup(consumer->socks, (void *)((unsigned long) key), |
| 250 | &iter); |
| 251 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 252 | if (node != NULL) { |
| 253 | socket = caa_container_of(node, struct consumer_socket, node); |
| 254 | } |
| 255 | |
| 256 | return socket; |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Allocate a new consumer_socket and return the pointer. |
| 261 | */ |
| 262 | struct consumer_socket *consumer_allocate_socket(int fd) |
| 263 | { |
| 264 | struct consumer_socket *socket = NULL; |
| 265 | |
| 266 | socket = zmalloc(sizeof(struct consumer_socket)); |
| 267 | if (socket == NULL) { |
| 268 | PERROR("zmalloc consumer socket"); |
| 269 | goto error; |
| 270 | } |
| 271 | |
| 272 | socket->fd = fd; |
| 273 | lttng_ht_node_init_ulong(&socket->node, fd); |
| 274 | |
| 275 | error: |
| 276 | return socket; |
| 277 | } |
| 278 | |
| 279 | /* |
| 280 | * Add consumer socket to consumer output object. Read side lock must be |
| 281 | * acquired before calling this function. |
| 282 | */ |
| 283 | void consumer_add_socket(struct consumer_socket *sock, |
| 284 | struct consumer_output *consumer) |
| 285 | { |
| 286 | assert(sock); |
| 287 | assert(consumer); |
| 288 | |
| 289 | lttng_ht_add_unique_ulong(consumer->socks, &sock->node); |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Delte consumer socket to consumer output object. Read side lock must be |
| 294 | * acquired before calling this function. |
| 295 | */ |
| 296 | void consumer_del_socket(struct consumer_socket *sock, |
| 297 | struct consumer_output *consumer) |
| 298 | { |
| 299 | int ret; |
| 300 | struct lttng_ht_iter iter; |
| 301 | |
| 302 | assert(sock); |
| 303 | assert(consumer); |
| 304 | |
| 305 | iter.iter.node = &sock->node.node; |
| 306 | ret = lttng_ht_del(consumer->socks, &iter); |
| 307 | assert(!ret); |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * RCU destroy call function. |
| 312 | */ |
| 313 | static void destroy_socket_rcu(struct rcu_head *head) |
| 314 | { |
| 315 | struct lttng_ht_node_ulong *node = |
| 316 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 317 | struct consumer_socket *socket = |
| 318 | caa_container_of(node, struct consumer_socket, node); |
| 319 | |
| 320 | free(socket); |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Destroy and free socket pointer in a call RCU. Read side lock must be |
| 325 | * acquired before calling this function. |
| 326 | */ |
| 327 | void consumer_destroy_socket(struct consumer_socket *sock) |
| 328 | { |
| 329 | assert(sock); |
| 330 | |
| 331 | /* |
| 332 | * We DO NOT close the file descriptor here since it is global to the |
| 333 | * session daemon and is closed only if the consumer dies or a custom |
| 334 | * consumer was registered, |
| 335 | */ |
| 336 | if (sock->registered) { |
| 337 | DBG3("Consumer socket was registered. Closing fd %d", sock->fd); |
| 338 | lttcomm_close_unix_sock(sock->fd); |
| 339 | } |
| 340 | |
| 341 | call_rcu(&sock->node.head, destroy_socket_rcu); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Allocate and assign data to a consumer_output object. |
| 346 | * |
| 347 | * Return pointer to structure. |
| 348 | */ |
| 349 | struct consumer_output *consumer_create_output(enum consumer_dst_type type) |
| 350 | { |
| 351 | struct consumer_output *output = NULL; |
| 352 | |
| 353 | output = zmalloc(sizeof(struct consumer_output)); |
| 354 | if (output == NULL) { |
| 355 | PERROR("zmalloc consumer_output"); |
| 356 | goto error; |
| 357 | } |
| 358 | |
| 359 | /* By default, consumer output is enabled */ |
| 360 | output->enabled = 1; |
| 361 | output->type = type; |
| 362 | output->net_seq_index = -1; |
| 363 | |
| 364 | output->socks = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 365 | |
| 366 | error: |
| 367 | return output; |
| 368 | } |
| 369 | |
| 370 | /* |
| 371 | * Delete the consumer_output object from the list and free the ptr. |
| 372 | */ |
| 373 | void consumer_destroy_output(struct consumer_output *obj) |
| 374 | { |
| 375 | if (obj == NULL) { |
| 376 | return; |
| 377 | } |
| 378 | |
| 379 | if (obj->socks) { |
| 380 | struct lttng_ht_iter iter; |
| 381 | struct consumer_socket *socket; |
| 382 | |
| 383 | rcu_read_lock(); |
| 384 | cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) { |
| 385 | consumer_del_socket(socket, obj); |
| 386 | consumer_destroy_socket(socket); |
| 387 | } |
| 388 | rcu_read_unlock(); |
| 389 | |
| 390 | /* Finally destroy HT */ |
| 391 | lttng_ht_destroy(obj->socks); |
| 392 | } |
| 393 | |
| 394 | free(obj); |
| 395 | } |
| 396 | |
| 397 | /* |
| 398 | * Copy consumer output and returned the newly allocated copy. |
| 399 | */ |
| 400 | struct consumer_output *consumer_copy_output(struct consumer_output *obj) |
| 401 | { |
| 402 | struct lttng_ht *tmp_ht_ptr; |
| 403 | struct lttng_ht_iter iter; |
| 404 | struct consumer_socket *socket, *copy_sock; |
| 405 | struct consumer_output *output; |
| 406 | |
| 407 | assert(obj); |
| 408 | |
| 409 | output = consumer_create_output(obj->type); |
| 410 | if (output == NULL) { |
| 411 | goto error; |
| 412 | } |
| 413 | /* Avoid losing the HT reference after the memcpy() */ |
| 414 | tmp_ht_ptr = output->socks; |
| 415 | |
| 416 | memcpy(output, obj, sizeof(struct consumer_output)); |
| 417 | |
| 418 | /* Putting back the HT pointer and start copying socket(s). */ |
| 419 | output->socks = tmp_ht_ptr; |
| 420 | |
| 421 | rcu_read_lock(); |
| 422 | cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) { |
| 423 | /* Create new socket object. */ |
| 424 | copy_sock = consumer_allocate_socket(socket->fd); |
| 425 | if (copy_sock == NULL) { |
| 426 | rcu_read_unlock(); |
| 427 | goto malloc_error; |
| 428 | } |
| 429 | |
| 430 | copy_sock->registered = socket->registered; |
| 431 | copy_sock->lock = socket->lock; |
| 432 | consumer_add_socket(copy_sock, output); |
| 433 | } |
| 434 | rcu_read_unlock(); |
| 435 | |
| 436 | error: |
| 437 | return output; |
| 438 | |
| 439 | malloc_error: |
| 440 | consumer_destroy_output(output); |
| 441 | return NULL; |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Set network URI to the consumer output object. |
| 446 | * |
| 447 | * Return 0 on success. Return 1 if the URI were equal. Else, negative value on |
| 448 | * error. |
| 449 | */ |
| 450 | int consumer_set_network_uri(struct consumer_output *obj, |
| 451 | struct lttng_uri *uri) |
| 452 | { |
| 453 | int ret; |
| 454 | char tmp_path[PATH_MAX]; |
| 455 | char hostname[HOST_NAME_MAX]; |
| 456 | struct lttng_uri *dst_uri = NULL; |
| 457 | |
| 458 | /* Code flow error safety net. */ |
| 459 | assert(obj); |
| 460 | assert(uri); |
| 461 | |
| 462 | switch (uri->stype) { |
| 463 | case LTTNG_STREAM_CONTROL: |
| 464 | dst_uri = &obj->dst.net.control; |
| 465 | obj->dst.net.control_isset = 1; |
| 466 | if (uri->port == 0) { |
| 467 | /* Assign default port. */ |
| 468 | uri->port = DEFAULT_NETWORK_CONTROL_PORT; |
| 469 | } |
| 470 | DBG3("Consumer control URI set with port %d", uri->port); |
| 471 | break; |
| 472 | case LTTNG_STREAM_DATA: |
| 473 | dst_uri = &obj->dst.net.data; |
| 474 | obj->dst.net.data_isset = 1; |
| 475 | if (uri->port == 0) { |
| 476 | /* Assign default port. */ |
| 477 | uri->port = DEFAULT_NETWORK_DATA_PORT; |
| 478 | } |
| 479 | DBG3("Consumer data URI set with port %d", uri->port); |
| 480 | break; |
| 481 | default: |
| 482 | ERR("Set network uri type unknown %d", uri->stype); |
| 483 | goto error; |
| 484 | } |
| 485 | |
| 486 | ret = uri_compare(dst_uri, uri); |
| 487 | if (!ret) { |
| 488 | /* Same URI, don't touch it and return success. */ |
| 489 | DBG3("URI network compare are the same"); |
| 490 | goto equal; |
| 491 | } |
| 492 | |
| 493 | /* URIs were not equal, replacing it. */ |
| 494 | memset(dst_uri, 0, sizeof(struct lttng_uri)); |
| 495 | memcpy(dst_uri, uri, sizeof(struct lttng_uri)); |
| 496 | obj->type = CONSUMER_DST_NET; |
| 497 | |
| 498 | /* Handle subdir and add hostname in front. */ |
| 499 | if (dst_uri->stype == LTTNG_STREAM_CONTROL) { |
| 500 | /* Get hostname to append it in the pathname */ |
| 501 | ret = gethostname(hostname, sizeof(hostname)); |
| 502 | if (ret < 0) { |
| 503 | PERROR("gethostname. Fallback on default localhost"); |
| 504 | strncpy(hostname, "localhost", sizeof(hostname)); |
| 505 | } |
| 506 | hostname[sizeof(hostname) - 1] = '\0'; |
| 507 | |
| 508 | /* Setup consumer subdir if none present in the control URI */ |
| 509 | if (strlen(dst_uri->subdir) == 0) { |
| 510 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", |
| 511 | hostname, obj->subdir); |
| 512 | } else { |
| 513 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", |
| 514 | hostname, dst_uri->subdir); |
| 515 | } |
| 516 | if (ret < 0) { |
| 517 | PERROR("snprintf set consumer uri subdir"); |
| 518 | goto error; |
| 519 | } |
| 520 | |
| 521 | strncpy(obj->subdir, tmp_path, sizeof(obj->subdir)); |
| 522 | DBG3("Consumer set network uri subdir path %s", tmp_path); |
| 523 | } |
| 524 | |
| 525 | return 0; |
| 526 | equal: |
| 527 | return 1; |
| 528 | error: |
| 529 | return -1; |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * Send file descriptor to consumer via sock. |
| 534 | */ |
| 535 | int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd) |
| 536 | { |
| 537 | int ret; |
| 538 | |
| 539 | assert(fds); |
| 540 | assert(sock); |
| 541 | assert(nb_fd > 0); |
| 542 | |
| 543 | ret = lttcomm_send_fds_unix_sock(sock->fd, fds, nb_fd); |
| 544 | if (ret < 0) { |
| 545 | /* The above call will print a PERROR on error. */ |
| 546 | DBG("Error when sending consumer fds on sock %d", sock->fd); |
| 547 | goto error; |
| 548 | } |
| 549 | |
| 550 | ret = consumer_recv_status_reply(sock); |
| 551 | |
| 552 | error: |
| 553 | return ret; |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * Consumer send communication message structure to consumer. |
| 558 | */ |
| 559 | int consumer_send_msg(struct consumer_socket *sock, |
| 560 | struct lttcomm_consumer_msg *msg) |
| 561 | { |
| 562 | int ret; |
| 563 | |
| 564 | assert(msg); |
| 565 | assert(sock); |
| 566 | assert(sock->fd >= 0); |
| 567 | |
| 568 | ret = lttcomm_send_unix_sock(sock->fd, msg, |
| 569 | sizeof(struct lttcomm_consumer_msg)); |
| 570 | if (ret < 0) { |
| 571 | /* The above call will print a PERROR on error. */ |
| 572 | DBG("Error when sending consumer channel on sock %d", sock->fd); |
| 573 | goto error; |
| 574 | } |
| 575 | |
| 576 | ret = consumer_recv_status_reply(sock); |
| 577 | |
| 578 | error: |
| 579 | return ret; |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * Consumer send channel communication message structure to consumer. |
| 584 | */ |
| 585 | int consumer_send_channel(struct consumer_socket *sock, |
| 586 | struct lttcomm_consumer_msg *msg) |
| 587 | { |
| 588 | int ret; |
| 589 | |
| 590 | assert(msg); |
| 591 | assert(sock); |
| 592 | assert(sock->fd >= 0); |
| 593 | |
| 594 | ret = lttcomm_send_unix_sock(sock->fd, msg, |
| 595 | sizeof(struct lttcomm_consumer_msg)); |
| 596 | if (ret < 0) { |
| 597 | /* The above call will print a PERROR on error. */ |
| 598 | DBG("Error when sending consumer channel on sock %d", sock->fd); |
| 599 | goto error; |
| 600 | } |
| 601 | |
| 602 | ret = consumer_recv_status_reply(sock); |
| 603 | |
| 604 | error: |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * Populate the given consumer msg structure with the ask_channel command |
| 610 | * information. |
| 611 | */ |
| 612 | void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg, |
| 613 | uint64_t subbuf_size, |
| 614 | uint64_t num_subbuf, |
| 615 | int overwrite, |
| 616 | unsigned int switch_timer_interval, |
| 617 | unsigned int read_timer_interval, |
| 618 | int output, |
| 619 | int type, |
| 620 | uint64_t session_id, |
| 621 | const char *pathname, |
| 622 | const char *name, |
| 623 | uid_t uid, |
| 624 | gid_t gid, |
| 625 | int relayd_id, |
| 626 | unsigned long key, |
| 627 | unsigned char *uuid) |
| 628 | { |
| 629 | assert(msg); |
| 630 | |
| 631 | /* Zeroed structure */ |
| 632 | memset(msg, 0, sizeof(struct lttcomm_consumer_msg)); |
| 633 | |
| 634 | msg->cmd_type = LTTNG_CONSUMER_ASK_CHANNEL_CREATION; |
| 635 | msg->u.ask_channel.subbuf_size = subbuf_size; |
| 636 | msg->u.ask_channel.num_subbuf = num_subbuf ; |
| 637 | msg->u.ask_channel.overwrite = overwrite; |
| 638 | msg->u.ask_channel.switch_timer_interval = switch_timer_interval; |
| 639 | msg->u.ask_channel.read_timer_interval = read_timer_interval; |
| 640 | msg->u.ask_channel.output = output; |
| 641 | msg->u.ask_channel.type = type; |
| 642 | msg->u.ask_channel.session_id = session_id; |
| 643 | msg->u.ask_channel.uid = uid; |
| 644 | msg->u.ask_channel.gid = gid; |
| 645 | msg->u.ask_channel.relayd_id = relayd_id; |
| 646 | msg->u.ask_channel.key = key; |
| 647 | |
| 648 | memcpy(msg->u.ask_channel.uuid, uuid, sizeof(msg->u.ask_channel.uuid)); |
| 649 | |
| 650 | strncpy(msg->u.ask_channel.pathname, pathname, |
| 651 | sizeof(msg->u.ask_channel.pathname)); |
| 652 | msg->u.ask_channel.pathname[sizeof(msg->u.ask_channel.pathname)-1] = '\0'; |
| 653 | |
| 654 | strncpy(msg->u.ask_channel.name, name, sizeof(msg->u.ask_channel.name)); |
| 655 | msg->u.ask_channel.name[sizeof(msg->u.ask_channel.name) - 1] = '\0'; |
| 656 | } |
| 657 | |
| 658 | /* |
| 659 | * Init channel communication message structure. |
| 660 | */ |
| 661 | void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg, |
| 662 | enum lttng_consumer_command cmd, |
| 663 | int channel_key, |
| 664 | uint64_t session_id, |
| 665 | const char *pathname, |
| 666 | uid_t uid, |
| 667 | gid_t gid, |
| 668 | int relayd_id, |
| 669 | const char *name, |
| 670 | unsigned int nb_init_streams, |
| 671 | enum lttng_event_output output, |
| 672 | int type) |
| 673 | { |
| 674 | assert(msg); |
| 675 | |
| 676 | /* Zeroed structure */ |
| 677 | memset(msg, 0, sizeof(struct lttcomm_consumer_msg)); |
| 678 | |
| 679 | /* Send channel */ |
| 680 | msg->cmd_type = cmd; |
| 681 | msg->u.channel.channel_key = channel_key; |
| 682 | msg->u.channel.session_id = session_id; |
| 683 | msg->u.channel.uid = uid; |
| 684 | msg->u.channel.gid = gid; |
| 685 | msg->u.channel.relayd_id = relayd_id; |
| 686 | msg->u.channel.nb_init_streams = nb_init_streams; |
| 687 | msg->u.channel.output = output; |
| 688 | msg->u.channel.type = type; |
| 689 | |
| 690 | strncpy(msg->u.channel.pathname, pathname, |
| 691 | sizeof(msg->u.channel.pathname)); |
| 692 | msg->u.channel.pathname[sizeof(msg->u.channel.pathname) - 1] = '\0'; |
| 693 | |
| 694 | strncpy(msg->u.channel.name, name, sizeof(msg->u.channel.name)); |
| 695 | msg->u.channel.name[sizeof(msg->u.channel.name) - 1] = '\0'; |
| 696 | } |
| 697 | |
| 698 | /* |
| 699 | * Init stream communication message structure. |
| 700 | */ |
| 701 | void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg, |
| 702 | enum lttng_consumer_command cmd, |
| 703 | int channel_key, |
| 704 | int stream_key, |
| 705 | int cpu) |
| 706 | { |
| 707 | assert(msg); |
| 708 | |
| 709 | memset(msg, 0, sizeof(struct lttcomm_consumer_msg)); |
| 710 | |
| 711 | msg->cmd_type = cmd; |
| 712 | msg->u.stream.channel_key = channel_key; |
| 713 | msg->u.stream.stream_key = stream_key; |
| 714 | msg->u.stream.cpu = cpu; |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * Send stream communication structure to the consumer. |
| 719 | */ |
| 720 | int consumer_send_stream(struct consumer_socket *sock, |
| 721 | struct consumer_output *dst, struct lttcomm_consumer_msg *msg, |
| 722 | int *fds, size_t nb_fd) |
| 723 | { |
| 724 | int ret; |
| 725 | |
| 726 | assert(msg); |
| 727 | assert(dst); |
| 728 | assert(sock); |
| 729 | assert(fds); |
| 730 | |
| 731 | /* Send on socket */ |
| 732 | ret = lttcomm_send_unix_sock(sock->fd, msg, |
| 733 | sizeof(struct lttcomm_consumer_msg)); |
| 734 | if (ret < 0) { |
| 735 | /* The above call will print a PERROR on error. */ |
| 736 | DBG("Error when sending consumer stream on sock %d", sock->fd); |
| 737 | goto error; |
| 738 | } |
| 739 | |
| 740 | ret = consumer_recv_status_reply(sock); |
| 741 | if (ret < 0) { |
| 742 | goto error; |
| 743 | } |
| 744 | |
| 745 | ret = consumer_send_fds(sock, fds, nb_fd); |
| 746 | if (ret < 0) { |
| 747 | goto error; |
| 748 | } |
| 749 | |
| 750 | error: |
| 751 | return ret; |
| 752 | } |
| 753 | |
| 754 | /* |
| 755 | * Send relayd socket to consumer associated with a session name. |
| 756 | * |
| 757 | * On success return positive value. On error, negative value. |
| 758 | */ |
| 759 | int consumer_send_relayd_socket(struct consumer_socket *consumer_sock, |
| 760 | struct lttcomm_sock *sock, struct consumer_output *consumer, |
| 761 | enum lttng_stream_type type, unsigned int session_id) |
| 762 | { |
| 763 | int ret; |
| 764 | struct lttcomm_consumer_msg msg; |
| 765 | |
| 766 | /* Code flow error. Safety net. */ |
| 767 | assert(sock); |
| 768 | assert(consumer); |
| 769 | assert(consumer_sock); |
| 770 | |
| 771 | /* Bail out if consumer is disabled */ |
| 772 | if (!consumer->enabled) { |
| 773 | ret = LTTNG_OK; |
| 774 | goto error; |
| 775 | } |
| 776 | |
| 777 | msg.cmd_type = LTTNG_CONSUMER_ADD_RELAYD_SOCKET; |
| 778 | /* |
| 779 | * Assign network consumer output index using the temporary consumer since |
| 780 | * this call should only be made from within a set_consumer_uri() function |
| 781 | * call in the session daemon. |
| 782 | */ |
| 783 | msg.u.relayd_sock.net_index = consumer->net_seq_index; |
| 784 | msg.u.relayd_sock.type = type; |
| 785 | msg.u.relayd_sock.session_id = session_id; |
| 786 | memcpy(&msg.u.relayd_sock.sock, sock, sizeof(msg.u.relayd_sock.sock)); |
| 787 | |
| 788 | DBG3("Sending relayd sock info to consumer on %d", consumer_sock->fd); |
| 789 | ret = lttcomm_send_unix_sock(consumer_sock->fd, &msg, sizeof(msg)); |
| 790 | if (ret < 0) { |
| 791 | /* The above call will print a PERROR on error. */ |
| 792 | DBG("Error when sending relayd sockets on sock %d", sock->fd); |
| 793 | goto error; |
| 794 | } |
| 795 | |
| 796 | ret = consumer_recv_status_reply(consumer_sock); |
| 797 | if (ret < 0) { |
| 798 | goto error; |
| 799 | } |
| 800 | |
| 801 | DBG3("Sending relayd socket file descriptor to consumer"); |
| 802 | ret = consumer_send_fds(consumer_sock, &sock->fd, 1); |
| 803 | if (ret < 0) { |
| 804 | goto error; |
| 805 | } |
| 806 | |
| 807 | DBG2("Consumer relayd socket sent"); |
| 808 | |
| 809 | error: |
| 810 | return ret; |
| 811 | } |
| 812 | |
| 813 | /* |
| 814 | * Set consumer subdirectory using the session name and a generated datetime if |
| 815 | * needed. This is appended to the current subdirectory. |
| 816 | */ |
| 817 | int consumer_set_subdir(struct consumer_output *consumer, |
| 818 | const char *session_name) |
| 819 | { |
| 820 | int ret = 0; |
| 821 | unsigned int have_default_name = 0; |
| 822 | char datetime[16], tmp_path[PATH_MAX]; |
| 823 | time_t rawtime; |
| 824 | struct tm *timeinfo; |
| 825 | |
| 826 | assert(consumer); |
| 827 | assert(session_name); |
| 828 | |
| 829 | memset(tmp_path, 0, sizeof(tmp_path)); |
| 830 | |
| 831 | /* Flag if we have a default session. */ |
| 832 | if (strncmp(session_name, DEFAULT_SESSION_NAME "-", |
| 833 | strlen(DEFAULT_SESSION_NAME) + 1) == 0) { |
| 834 | have_default_name = 1; |
| 835 | } else { |
| 836 | /* Get date and time for session path */ |
| 837 | time(&rawtime); |
| 838 | timeinfo = localtime(&rawtime); |
| 839 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
| 840 | } |
| 841 | |
| 842 | if (have_default_name) { |
| 843 | ret = snprintf(tmp_path, sizeof(tmp_path), |
| 844 | "%s/%s", consumer->subdir, session_name); |
| 845 | } else { |
| 846 | ret = snprintf(tmp_path, sizeof(tmp_path), |
| 847 | "%s/%s-%s/", consumer->subdir, session_name, datetime); |
| 848 | } |
| 849 | if (ret < 0) { |
| 850 | PERROR("snprintf session name date"); |
| 851 | goto error; |
| 852 | } |
| 853 | |
| 854 | strncpy(consumer->subdir, tmp_path, sizeof(consumer->subdir)); |
| 855 | DBG2("Consumer subdir set to %s", consumer->subdir); |
| 856 | |
| 857 | error: |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Ask the consumer if the data is ready to read (NOT pending) for the specific |
| 863 | * session id. |
| 864 | * |
| 865 | * This function has a different behavior with the consumer i.e. that it waits |
| 866 | * for a reply from the consumer if yes or no the data is pending. |
| 867 | */ |
| 868 | int consumer_is_data_pending(unsigned int id, |
| 869 | struct consumer_output *consumer) |
| 870 | { |
| 871 | int ret; |
| 872 | int32_t ret_code = 0; /* Default is that the data is NOT pending */ |
| 873 | struct consumer_socket *socket; |
| 874 | struct lttng_ht_iter iter; |
| 875 | struct lttcomm_consumer_msg msg; |
| 876 | |
| 877 | assert(consumer); |
| 878 | |
| 879 | msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING; |
| 880 | |
| 881 | msg.u.data_pending.session_id = (uint64_t) id; |
| 882 | |
| 883 | DBG3("Consumer data pending for id %u", id); |
| 884 | |
| 885 | /* Send command for each consumer */ |
| 886 | rcu_read_lock(); |
| 887 | cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket, |
| 888 | node.node) { |
| 889 | /* Code flow error */ |
| 890 | assert(socket->fd >= 0); |
| 891 | |
| 892 | pthread_mutex_lock(socket->lock); |
| 893 | |
| 894 | ret = lttcomm_send_unix_sock(socket->fd, &msg, sizeof(msg)); |
| 895 | if (ret < 0) { |
| 896 | /* The above call will print a PERROR on error. */ |
| 897 | DBG("Error on consumer is data pending on sock %d", socket->fd); |
| 898 | pthread_mutex_unlock(socket->lock); |
| 899 | goto error_unlock; |
| 900 | } |
| 901 | |
| 902 | /* |
| 903 | * No need for a recv reply status because the answer to the command is |
| 904 | * the reply status message. |
| 905 | */ |
| 906 | |
| 907 | ret = lttcomm_recv_unix_sock(socket->fd, &ret_code, sizeof(ret_code)); |
| 908 | if (ret <= 0) { |
| 909 | if (ret == 0) { |
| 910 | /* Orderly shutdown. Don't return 0 which means success. */ |
| 911 | ret = -1; |
| 912 | } |
| 913 | /* The above call will print a PERROR on error. */ |
| 914 | DBG("Error on recv consumer is data pending on sock %d", socket->fd); |
| 915 | pthread_mutex_unlock(socket->lock); |
| 916 | goto error_unlock; |
| 917 | } |
| 918 | |
| 919 | pthread_mutex_unlock(socket->lock); |
| 920 | |
| 921 | if (ret_code == 1) { |
| 922 | break; |
| 923 | } |
| 924 | } |
| 925 | rcu_read_unlock(); |
| 926 | |
| 927 | DBG("Consumer data is %s pending for session id %u", |
| 928 | ret_code == 1 ? "" : "NOT", id); |
| 929 | return ret_code; |
| 930 | |
| 931 | error_unlock: |
| 932 | rcu_read_unlock(); |
| 933 | return -1; |
| 934 | } |