| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <errno.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #include <common/common.h> |
| 26 | #include <common/consumer.h> |
| 27 | #include <common/defaults.h> |
| 28 | |
| 29 | #include "consumer.h" |
| 30 | #include "ust-consumer.h" |
| 31 | |
| 32 | /* |
| 33 | * Send a single channel to the consumer using command ADD_CHANNEL. |
| 34 | */ |
| 35 | static int send_channel(struct consumer_socket *sock, |
| 36 | struct ust_app_channel *uchan) |
| 37 | { |
| 38 | int ret, fd; |
| 39 | struct lttcomm_consumer_msg msg; |
| 40 | |
| 41 | /* Safety net */ |
| 42 | assert(uchan); |
| 43 | assert(sock); |
| 44 | |
| 45 | if (sock->fd < 0) { |
| 46 | ret = -EINVAL; |
| 47 | goto error; |
| 48 | } |
| 49 | |
| 50 | DBG2("Sending channel %s to UST consumer", uchan->name); |
| 51 | |
| 52 | consumer_init_channel_comm_msg(&msg, |
| 53 | LTTNG_CONSUMER_ADD_CHANNEL, |
| 54 | uchan->obj->shm_fd, |
| 55 | uchan->attr.subbuf_size, |
| 56 | uchan->obj->memory_map_size, |
| 57 | uchan->name, |
| 58 | uchan->streams.count); |
| 59 | |
| 60 | ret = consumer_send_channel(sock, &msg); |
| 61 | if (ret < 0) { |
| 62 | goto error; |
| 63 | } |
| 64 | |
| 65 | fd = uchan->obj->shm_fd; |
| 66 | ret = consumer_send_fds(sock, &fd, 1); |
| 67 | if (ret < 0) { |
| 68 | goto error; |
| 69 | } |
| 70 | |
| 71 | error: |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Send a single stream to the consumer using ADD_STREAM command. |
| 77 | */ |
| 78 | static int send_channel_stream(struct consumer_socket *sock, |
| 79 | struct ust_app_channel *uchan, struct ust_app_session *usess, |
| 80 | struct ltt_ust_stream *stream, struct consumer_output *consumer, |
| 81 | const char *pathname) |
| 82 | { |
| 83 | int ret, fds[2]; |
| 84 | struct lttcomm_consumer_msg msg; |
| 85 | |
| 86 | /* Safety net */ |
| 87 | assert(uchan); |
| 88 | assert(usess); |
| 89 | assert(stream); |
| 90 | assert(consumer); |
| 91 | assert(sock); |
| 92 | |
| 93 | DBG2("Sending stream %d of channel %s to kernel consumer", |
| 94 | stream->obj->shm_fd, uchan->name); |
| 95 | |
| 96 | consumer_init_stream_comm_msg(&msg, |
| 97 | LTTNG_CONSUMER_ADD_STREAM, |
| 98 | uchan->obj->shm_fd, |
| 99 | stream->obj->shm_fd, |
| 100 | LTTNG_CONSUMER_ACTIVE_STREAM, |
| 101 | DEFAULT_UST_CHANNEL_OUTPUT, |
| 102 | stream->obj->memory_map_size, |
| 103 | usess->uid, |
| 104 | usess->gid, |
| 105 | consumer->net_seq_index, |
| 106 | 0, /* Metadata flag unset */ |
| 107 | stream->name, |
| 108 | pathname, |
| 109 | usess->id); |
| 110 | |
| 111 | /* Send stream and file descriptor */ |
| 112 | fds[0] = stream->obj->shm_fd; |
| 113 | fds[1] = stream->obj->wait_fd; |
| 114 | ret = consumer_send_stream(sock, consumer, &msg, fds, 2); |
| 115 | if (ret < 0) { |
| 116 | goto error; |
| 117 | } |
| 118 | |
| 119 | error: |
| 120 | return ret; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Send all stream fds of UST channel to the consumer. |
| 125 | */ |
| 126 | static int send_channel_streams(struct consumer_socket *sock, |
| 127 | struct ust_app_channel *uchan, struct ust_app_session *usess, |
| 128 | struct consumer_output *consumer) |
| 129 | { |
| 130 | int ret; |
| 131 | char tmp_path[PATH_MAX]; |
| 132 | const char *pathname; |
| 133 | struct ltt_ust_stream *stream, *tmp; |
| 134 | |
| 135 | assert(sock); |
| 136 | |
| 137 | DBG("Sending streams of channel %s to UST consumer", uchan->name); |
| 138 | |
| 139 | ret = send_channel(sock, uchan); |
| 140 | if (ret < 0) { |
| 141 | goto error; |
| 142 | } |
| 143 | |
| 144 | /* Get the right path name destination */ |
| 145 | if (consumer->type == CONSUMER_DST_LOCAL) { |
| 146 | /* Set application path to the destination path */ |
| 147 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s/%s", |
| 148 | consumer->dst.trace_path, consumer->subdir, usess->path); |
| 149 | if (ret < 0) { |
| 150 | PERROR("snprintf stream path"); |
| 151 | goto error; |
| 152 | } |
| 153 | pathname = tmp_path; |
| 154 | DBG3("UST local consumer tracefile path: %s", pathname); |
| 155 | } else { |
| 156 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", |
| 157 | consumer->subdir, usess->path); |
| 158 | if (ret < 0) { |
| 159 | PERROR("snprintf stream path"); |
| 160 | goto error; |
| 161 | } |
| 162 | pathname = tmp_path; |
| 163 | DBG3("UST network consumer subdir path: %s", pathname); |
| 164 | } |
| 165 | |
| 166 | cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) { |
| 167 | if (!stream->obj->shm_fd) { |
| 168 | continue; |
| 169 | } |
| 170 | |
| 171 | ret = send_channel_stream(sock, uchan, usess, stream, consumer, |
| 172 | pathname); |
| 173 | if (ret < 0) { |
| 174 | goto error; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | DBG("UST consumer channel streams sent"); |
| 179 | |
| 180 | return 0; |
| 181 | |
| 182 | error: |
| 183 | return ret; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM. |
| 188 | */ |
| 189 | static int send_metadata(struct consumer_socket *sock, |
| 190 | struct ust_app_session *usess, struct consumer_output *consumer) |
| 191 | { |
| 192 | int ret, fd, fds[2]; |
| 193 | char tmp_path[PATH_MAX]; |
| 194 | const char *pathname; |
| 195 | struct lttcomm_consumer_msg msg; |
| 196 | |
| 197 | /* Safety net */ |
| 198 | assert(usess); |
| 199 | assert(consumer); |
| 200 | assert(sock); |
| 201 | |
| 202 | if (sock->fd < 0) { |
| 203 | ERR("Consumer socket is negative (%d)", sock->fd); |
| 204 | return -EINVAL; |
| 205 | } |
| 206 | |
| 207 | if (usess->metadata->obj->shm_fd == 0) { |
| 208 | ERR("Metadata obj shm_fd is 0"); |
| 209 | ret = -1; |
| 210 | goto error; |
| 211 | } |
| 212 | |
| 213 | DBG("UST consumer sending metadata stream fd"); |
| 214 | |
| 215 | consumer_init_channel_comm_msg(&msg, |
| 216 | LTTNG_CONSUMER_ADD_CHANNEL, |
| 217 | usess->metadata->obj->shm_fd, |
| 218 | usess->metadata->attr.subbuf_size, |
| 219 | usess->metadata->obj->memory_map_size, |
| 220 | "metadata", |
| 221 | 1); |
| 222 | |
| 223 | ret = consumer_send_channel(sock, &msg); |
| 224 | if (ret < 0) { |
| 225 | goto error; |
| 226 | } |
| 227 | |
| 228 | /* Sending metadata shared memory fd */ |
| 229 | fd = usess->metadata->obj->shm_fd; |
| 230 | ret = consumer_send_fds(sock, &fd, 1); |
| 231 | if (ret < 0) { |
| 232 | goto error; |
| 233 | } |
| 234 | |
| 235 | /* Get correct path name destination */ |
| 236 | if (consumer->type == CONSUMER_DST_LOCAL) { |
| 237 | /* Set application path to the destination path */ |
| 238 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s/%s", |
| 239 | consumer->dst.trace_path, consumer->subdir, usess->path); |
| 240 | if (ret < 0) { |
| 241 | PERROR("snprintf stream path"); |
| 242 | goto error; |
| 243 | } |
| 244 | pathname = tmp_path; |
| 245 | |
| 246 | /* Create directory */ |
| 247 | ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, |
| 248 | usess->uid, usess->gid); |
| 249 | if (ret < 0) { |
| 250 | if (ret != -EEXIST) { |
| 251 | ERR("Trace directory creation error"); |
| 252 | goto error; |
| 253 | } |
| 254 | } |
| 255 | } else { |
| 256 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", |
| 257 | consumer->subdir, usess->path); |
| 258 | if (ret < 0) { |
| 259 | PERROR("snprintf metadata path"); |
| 260 | goto error; |
| 261 | } |
| 262 | pathname = tmp_path; |
| 263 | } |
| 264 | |
| 265 | consumer_init_stream_comm_msg(&msg, |
| 266 | LTTNG_CONSUMER_ADD_STREAM, |
| 267 | usess->metadata->obj->shm_fd, |
| 268 | usess->metadata->stream_obj->shm_fd, |
| 269 | LTTNG_CONSUMER_ACTIVE_STREAM, |
| 270 | DEFAULT_UST_CHANNEL_OUTPUT, |
| 271 | usess->metadata->stream_obj->memory_map_size, |
| 272 | usess->uid, |
| 273 | usess->gid, |
| 274 | consumer->net_seq_index, |
| 275 | 1, /* Flag metadata set */ |
| 276 | "metadata", |
| 277 | pathname, |
| 278 | usess->id); |
| 279 | |
| 280 | /* Send stream and file descriptor */ |
| 281 | fds[0] = usess->metadata->stream_obj->shm_fd; |
| 282 | fds[1] = usess->metadata->stream_obj->wait_fd; |
| 283 | ret = consumer_send_stream(sock, consumer, &msg, fds, 2); |
| 284 | if (ret < 0) { |
| 285 | goto error; |
| 286 | } |
| 287 | |
| 288 | error: |
| 289 | return ret; |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Send all stream fds of the UST session to the consumer. |
| 294 | */ |
| 295 | int ust_consumer_send_session(struct ust_app_session *usess, |
| 296 | struct consumer_output *consumer, struct consumer_socket *sock) |
| 297 | { |
| 298 | int ret = 0; |
| 299 | struct lttng_ht_iter iter; |
| 300 | struct ust_app_channel *ua_chan; |
| 301 | |
| 302 | assert(usess); |
| 303 | |
| 304 | if (consumer == NULL || sock == NULL) { |
| 305 | /* There is no consumer so just ignoring the command. */ |
| 306 | DBG("UST consumer does not exist. Not sending streams"); |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | DBG("Sending metadata stream fd to consumer on %d", sock->fd); |
| 311 | |
| 312 | pthread_mutex_lock(sock->lock); |
| 313 | |
| 314 | /* Sending metadata information to the consumer */ |
| 315 | ret = send_metadata(sock, usess, consumer); |
| 316 | if (ret < 0) { |
| 317 | goto error; |
| 318 | } |
| 319 | |
| 320 | /* Send each channel fd streams of session */ |
| 321 | rcu_read_lock(); |
| 322 | cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan, |
| 323 | node.node) { |
| 324 | /* |
| 325 | * Indicate that the channel was not created on the tracer side so skip |
| 326 | * sending unexisting streams. |
| 327 | */ |
| 328 | if (ua_chan->obj == NULL) { |
| 329 | continue; |
| 330 | } |
| 331 | |
| 332 | ret = send_channel_streams(sock, ua_chan, usess, consumer); |
| 333 | if (ret < 0) { |
| 334 | rcu_read_unlock(); |
| 335 | goto error; |
| 336 | } |
| 337 | } |
| 338 | rcu_read_unlock(); |
| 339 | |
| 340 | DBG("consumer fds (metadata and channel streams) sent"); |
| 341 | |
| 342 | /* All good! */ |
| 343 | ret = 0; |
| 344 | |
| 345 | error: |
| 346 | pthread_mutex_unlock(sock->lock); |
| 347 | return ret; |
| 348 | } |