| 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 _LGPL_SOURCE |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <sys/stat.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | #include <common/common.h> |
| 25 | #include <common/defaults.h> |
| 26 | #include <common/compat/string.h> |
| 27 | |
| 28 | #include "consumer.h" |
| 29 | #include "health-sessiond.h" |
| 30 | #include "kernel-consumer.h" |
| 31 | #include "notification-thread-commands.h" |
| 32 | #include "session.h" |
| 33 | #include "lttng-sessiond.h" |
| 34 | |
| 35 | static char *create_channel_path(struct consumer_output *consumer, |
| 36 | uid_t uid, gid_t gid) |
| 37 | { |
| 38 | int ret; |
| 39 | char tmp_path[PATH_MAX]; |
| 40 | char *pathname = NULL; |
| 41 | |
| 42 | assert(consumer); |
| 43 | |
| 44 | /* Get the right path name destination */ |
| 45 | if (consumer->type == CONSUMER_DST_LOCAL) { |
| 46 | /* Set application path to the destination path */ |
| 47 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s%s", |
| 48 | consumer->dst.trace_path, consumer->subdir); |
| 49 | if (ret < 0) { |
| 50 | PERROR("snprintf kernel channel path"); |
| 51 | goto error; |
| 52 | } |
| 53 | pathname = lttng_strndup(tmp_path, sizeof(tmp_path)); |
| 54 | if (!pathname) { |
| 55 | PERROR("lttng_strndup"); |
| 56 | goto error; |
| 57 | } |
| 58 | |
| 59 | /* Create directory */ |
| 60 | ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, uid, gid); |
| 61 | if (ret < 0) { |
| 62 | if (errno != EEXIST) { |
| 63 | ERR("Trace directory creation error"); |
| 64 | goto error; |
| 65 | } |
| 66 | } |
| 67 | DBG3("Kernel local consumer tracefile path: %s", pathname); |
| 68 | } else { |
| 69 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir); |
| 70 | if (ret < 0) { |
| 71 | PERROR("snprintf kernel metadata path"); |
| 72 | goto error; |
| 73 | } |
| 74 | pathname = lttng_strndup(tmp_path, sizeof(tmp_path)); |
| 75 | if (!pathname) { |
| 76 | PERROR("lttng_strndup"); |
| 77 | goto error; |
| 78 | } |
| 79 | DBG3("Kernel network consumer subdir path: %s", pathname); |
| 80 | } |
| 81 | |
| 82 | return pathname; |
| 83 | |
| 84 | error: |
| 85 | free(pathname); |
| 86 | return NULL; |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Sending a single channel to the consumer with command ADD_CHANNEL. |
| 91 | */ |
| 92 | int kernel_consumer_add_channel(struct consumer_socket *sock, |
| 93 | struct ltt_kernel_channel *channel, |
| 94 | struct ltt_kernel_session *ksession, |
| 95 | unsigned int monitor) |
| 96 | { |
| 97 | int ret; |
| 98 | char *pathname; |
| 99 | struct lttcomm_consumer_msg lkm; |
| 100 | struct consumer_output *consumer; |
| 101 | enum lttng_error_code status; |
| 102 | struct ltt_session *session; |
| 103 | struct lttng_channel_extended *channel_attr_extended; |
| 104 | |
| 105 | /* Safety net */ |
| 106 | assert(channel); |
| 107 | assert(ksession); |
| 108 | assert(ksession->consumer); |
| 109 | |
| 110 | consumer = ksession->consumer; |
| 111 | channel_attr_extended = (struct lttng_channel_extended *) |
| 112 | channel->channel->attr.extended.ptr; |
| 113 | |
| 114 | DBG("Kernel consumer adding channel %s to kernel consumer", |
| 115 | channel->channel->name); |
| 116 | |
| 117 | if (monitor) { |
| 118 | pathname = create_channel_path(consumer, ksession->uid, |
| 119 | ksession->gid); |
| 120 | } else { |
| 121 | /* Empty path. */ |
| 122 | pathname = strdup(""); |
| 123 | } |
| 124 | if (!pathname) { |
| 125 | ret = -1; |
| 126 | goto error; |
| 127 | } |
| 128 | |
| 129 | /* Prep channel message structure */ |
| 130 | consumer_init_channel_comm_msg(&lkm, |
| 131 | LTTNG_CONSUMER_ADD_CHANNEL, |
| 132 | channel->fd, |
| 133 | ksession->id, |
| 134 | pathname, |
| 135 | ksession->uid, |
| 136 | ksession->gid, |
| 137 | consumer->net_seq_index, |
| 138 | channel->channel->name, |
| 139 | channel->stream_count, |
| 140 | channel->channel->attr.output, |
| 141 | CONSUMER_CHANNEL_TYPE_DATA, |
| 142 | channel->channel->attr.tracefile_size, |
| 143 | channel->channel->attr.tracefile_count, |
| 144 | monitor, |
| 145 | channel->channel->attr.live_timer_interval, |
| 146 | channel_attr_extended->monitor_timer_interval); |
| 147 | |
| 148 | health_code_update(); |
| 149 | |
| 150 | ret = consumer_send_channel(sock, &lkm); |
| 151 | if (ret < 0) { |
| 152 | goto error; |
| 153 | } |
| 154 | |
| 155 | health_code_update(); |
| 156 | rcu_read_lock(); |
| 157 | session = session_find_by_id(ksession->id); |
| 158 | assert(session); |
| 159 | |
| 160 | status = notification_thread_command_add_channel( |
| 161 | notification_thread_handle, session->name, |
| 162 | ksession->uid, ksession->gid, |
| 163 | channel->channel->name, channel->fd, |
| 164 | LTTNG_DOMAIN_KERNEL, |
| 165 | channel->channel->attr.subbuf_size * channel->channel->attr.num_subbuf); |
| 166 | rcu_read_unlock(); |
| 167 | if (status != LTTNG_OK) { |
| 168 | ret = -1; |
| 169 | goto error; |
| 170 | } |
| 171 | |
| 172 | channel->published_to_notification_thread = true; |
| 173 | |
| 174 | error: |
| 175 | free(pathname); |
| 176 | return ret; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM. |
| 181 | */ |
| 182 | int kernel_consumer_add_metadata(struct consumer_socket *sock, |
| 183 | struct ltt_kernel_session *session, unsigned int monitor) |
| 184 | { |
| 185 | int ret; |
| 186 | char *pathname; |
| 187 | struct lttcomm_consumer_msg lkm; |
| 188 | struct consumer_output *consumer; |
| 189 | |
| 190 | /* Safety net */ |
| 191 | assert(session); |
| 192 | assert(session->consumer); |
| 193 | assert(sock); |
| 194 | |
| 195 | DBG("Sending metadata %d to kernel consumer", session->metadata_stream_fd); |
| 196 | |
| 197 | /* Get consumer output pointer */ |
| 198 | consumer = session->consumer; |
| 199 | |
| 200 | if (monitor) { |
| 201 | pathname = create_channel_path(consumer, session->uid, session->gid); |
| 202 | } else { |
| 203 | /* Empty path. */ |
| 204 | pathname = strdup(""); |
| 205 | } |
| 206 | if (!pathname) { |
| 207 | ret = -1; |
| 208 | goto error; |
| 209 | } |
| 210 | |
| 211 | /* Prep channel message structure */ |
| 212 | consumer_init_channel_comm_msg(&lkm, |
| 213 | LTTNG_CONSUMER_ADD_CHANNEL, |
| 214 | session->metadata->fd, |
| 215 | session->id, |
| 216 | pathname, |
| 217 | session->uid, |
| 218 | session->gid, |
| 219 | consumer->net_seq_index, |
| 220 | DEFAULT_METADATA_NAME, |
| 221 | 1, |
| 222 | DEFAULT_KERNEL_CHANNEL_OUTPUT, |
| 223 | CONSUMER_CHANNEL_TYPE_METADATA, |
| 224 | 0, 0, |
| 225 | monitor, 0, 0); |
| 226 | |
| 227 | health_code_update(); |
| 228 | |
| 229 | ret = consumer_send_channel(sock, &lkm); |
| 230 | if (ret < 0) { |
| 231 | goto error; |
| 232 | } |
| 233 | |
| 234 | health_code_update(); |
| 235 | |
| 236 | /* Prep stream message structure */ |
| 237 | consumer_init_stream_comm_msg(&lkm, |
| 238 | LTTNG_CONSUMER_ADD_STREAM, |
| 239 | session->metadata->fd, |
| 240 | session->metadata_stream_fd, |
| 241 | 0); /* CPU: 0 for metadata. */ |
| 242 | |
| 243 | health_code_update(); |
| 244 | |
| 245 | /* Send stream and file descriptor */ |
| 246 | ret = consumer_send_stream(sock, consumer, &lkm, |
| 247 | &session->metadata_stream_fd, 1); |
| 248 | if (ret < 0) { |
| 249 | goto error; |
| 250 | } |
| 251 | |
| 252 | health_code_update(); |
| 253 | |
| 254 | error: |
| 255 | free(pathname); |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Sending a single stream to the consumer with command ADD_STREAM. |
| 261 | */ |
| 262 | int kernel_consumer_add_stream(struct consumer_socket *sock, |
| 263 | struct ltt_kernel_channel *channel, struct ltt_kernel_stream *stream, |
| 264 | struct ltt_kernel_session *session, unsigned int monitor) |
| 265 | { |
| 266 | int ret; |
| 267 | struct lttcomm_consumer_msg lkm; |
| 268 | struct consumer_output *consumer; |
| 269 | |
| 270 | assert(channel); |
| 271 | assert(stream); |
| 272 | assert(session); |
| 273 | assert(session->consumer); |
| 274 | assert(sock); |
| 275 | |
| 276 | DBG("Sending stream %d of channel %s to kernel consumer", |
| 277 | stream->fd, channel->channel->name); |
| 278 | |
| 279 | /* Get consumer output pointer */ |
| 280 | consumer = session->consumer; |
| 281 | |
| 282 | /* Prep stream consumer message */ |
| 283 | consumer_init_stream_comm_msg(&lkm, |
| 284 | LTTNG_CONSUMER_ADD_STREAM, |
| 285 | channel->fd, |
| 286 | stream->fd, |
| 287 | stream->cpu); |
| 288 | |
| 289 | health_code_update(); |
| 290 | |
| 291 | /* Send stream and file descriptor */ |
| 292 | ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1); |
| 293 | if (ret < 0) { |
| 294 | goto error; |
| 295 | } |
| 296 | |
| 297 | health_code_update(); |
| 298 | |
| 299 | error: |
| 300 | return ret; |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Sending the notification that all streams were sent with STREAMS_SENT. |
| 305 | */ |
| 306 | int kernel_consumer_streams_sent(struct consumer_socket *sock, |
| 307 | struct ltt_kernel_session *session, uint64_t channel_key) |
| 308 | { |
| 309 | int ret; |
| 310 | struct lttcomm_consumer_msg lkm; |
| 311 | struct consumer_output *consumer; |
| 312 | |
| 313 | assert(sock); |
| 314 | assert(session); |
| 315 | |
| 316 | DBG("Sending streams_sent"); |
| 317 | /* Get consumer output pointer */ |
| 318 | consumer = session->consumer; |
| 319 | |
| 320 | /* Prep stream consumer message */ |
| 321 | consumer_init_streams_sent_comm_msg(&lkm, |
| 322 | LTTNG_CONSUMER_STREAMS_SENT, |
| 323 | channel_key, consumer->net_seq_index); |
| 324 | |
| 325 | health_code_update(); |
| 326 | |
| 327 | /* Send stream and file descriptor */ |
| 328 | ret = consumer_send_msg(sock, &lkm); |
| 329 | if (ret < 0) { |
| 330 | goto error; |
| 331 | } |
| 332 | |
| 333 | error: |
| 334 | return ret; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * Send all stream fds of kernel channel to the consumer. |
| 339 | */ |
| 340 | int kernel_consumer_send_channel_stream(struct consumer_socket *sock, |
| 341 | struct ltt_kernel_channel *channel, struct ltt_kernel_session *session, |
| 342 | unsigned int monitor) |
| 343 | { |
| 344 | int ret = LTTNG_OK; |
| 345 | struct ltt_kernel_stream *stream; |
| 346 | |
| 347 | /* Safety net */ |
| 348 | assert(channel); |
| 349 | assert(session); |
| 350 | assert(session->consumer); |
| 351 | assert(sock); |
| 352 | |
| 353 | /* Bail out if consumer is disabled */ |
| 354 | if (!session->consumer->enabled) { |
| 355 | ret = LTTNG_OK; |
| 356 | goto error; |
| 357 | } |
| 358 | |
| 359 | DBG("Sending streams of channel %s to kernel consumer", |
| 360 | channel->channel->name); |
| 361 | |
| 362 | if (!channel->sent_to_consumer) { |
| 363 | ret = kernel_consumer_add_channel(sock, channel, session, monitor); |
| 364 | if (ret < 0) { |
| 365 | goto error; |
| 366 | } |
| 367 | channel->sent_to_consumer = true; |
| 368 | } |
| 369 | |
| 370 | /* Send streams */ |
| 371 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 372 | if (!stream->fd || stream->sent_to_consumer) { |
| 373 | continue; |
| 374 | } |
| 375 | |
| 376 | /* Add stream on the kernel consumer side. */ |
| 377 | ret = kernel_consumer_add_stream(sock, channel, stream, session, |
| 378 | monitor); |
| 379 | if (ret < 0) { |
| 380 | goto error; |
| 381 | } |
| 382 | stream->sent_to_consumer = true; |
| 383 | } |
| 384 | |
| 385 | error: |
| 386 | return ret; |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Send all stream fds of the kernel session to the consumer. |
| 391 | */ |
| 392 | int kernel_consumer_send_session(struct consumer_socket *sock, |
| 393 | struct ltt_kernel_session *session) |
| 394 | { |
| 395 | int ret, monitor = 0; |
| 396 | struct ltt_kernel_channel *chan; |
| 397 | |
| 398 | /* Safety net */ |
| 399 | assert(session); |
| 400 | assert(session->consumer); |
| 401 | assert(sock); |
| 402 | |
| 403 | /* Bail out if consumer is disabled */ |
| 404 | if (!session->consumer->enabled) { |
| 405 | ret = LTTNG_OK; |
| 406 | goto error; |
| 407 | } |
| 408 | |
| 409 | /* Don't monitor the streams on the consumer if in flight recorder. */ |
| 410 | if (session->output_traces) { |
| 411 | monitor = 1; |
| 412 | } |
| 413 | |
| 414 | DBG("Sending session stream to kernel consumer"); |
| 415 | |
| 416 | if (session->metadata_stream_fd >= 0 && session->metadata) { |
| 417 | ret = kernel_consumer_add_metadata(sock, session, monitor); |
| 418 | if (ret < 0) { |
| 419 | goto error; |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | /* Send channel and streams of it */ |
| 424 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 425 | ret = kernel_consumer_send_channel_stream(sock, chan, session, |
| 426 | monitor); |
| 427 | if (ret < 0) { |
| 428 | goto error; |
| 429 | } |
| 430 | if (monitor) { |
| 431 | /* |
| 432 | * Inform the relay that all the streams for the |
| 433 | * channel were sent. |
| 434 | */ |
| 435 | ret = kernel_consumer_streams_sent(sock, session, chan->fd); |
| 436 | if (ret < 0) { |
| 437 | goto error; |
| 438 | } |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | DBG("Kernel consumer FDs of metadata and channel streams sent"); |
| 443 | |
| 444 | session->consumer_fds_sent = 1; |
| 445 | return 0; |
| 446 | |
| 447 | error: |
| 448 | return ret; |
| 449 | } |
| 450 | |
| 451 | int kernel_consumer_destroy_channel(struct consumer_socket *socket, |
| 452 | struct ltt_kernel_channel *channel) |
| 453 | { |
| 454 | int ret; |
| 455 | struct lttcomm_consumer_msg msg; |
| 456 | |
| 457 | assert(channel); |
| 458 | assert(socket); |
| 459 | |
| 460 | DBG("Sending kernel consumer destroy channel key %d", channel->fd); |
| 461 | |
| 462 | memset(&msg, 0, sizeof(msg)); |
| 463 | msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL; |
| 464 | msg.u.destroy_channel.key = channel->fd; |
| 465 | |
| 466 | pthread_mutex_lock(socket->lock); |
| 467 | health_code_update(); |
| 468 | |
| 469 | ret = consumer_send_msg(socket, &msg); |
| 470 | if (ret < 0) { |
| 471 | goto error; |
| 472 | } |
| 473 | |
| 474 | error: |
| 475 | health_code_update(); |
| 476 | pthread_mutex_unlock(socket->lock); |
| 477 | return ret; |
| 478 | } |
| 479 | |
| 480 | int kernel_consumer_destroy_metadata(struct consumer_socket *socket, |
| 481 | struct ltt_kernel_metadata *metadata) |
| 482 | { |
| 483 | int ret; |
| 484 | struct lttcomm_consumer_msg msg; |
| 485 | |
| 486 | assert(metadata); |
| 487 | assert(socket); |
| 488 | |
| 489 | DBG("Sending kernel consumer destroy channel key %d", metadata->fd); |
| 490 | |
| 491 | memset(&msg, 0, sizeof(msg)); |
| 492 | msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL; |
| 493 | msg.u.destroy_channel.key = metadata->fd; |
| 494 | |
| 495 | pthread_mutex_lock(socket->lock); |
| 496 | health_code_update(); |
| 497 | |
| 498 | ret = consumer_send_msg(socket, &msg); |
| 499 | if (ret < 0) { |
| 500 | goto error; |
| 501 | } |
| 502 | |
| 503 | error: |
| 504 | health_code_update(); |
| 505 | pthread_mutex_unlock(socket->lock); |
| 506 | return ret; |
| 507 | } |