| 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 <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #include <common/common.h> |
| 26 | #include <common/defaults.h> |
| 27 | |
| 28 | #include "consumer.h" |
| 29 | #include "kernel-consumer.h" |
| 30 | |
| 31 | /* |
| 32 | * Sending a single channel to the consumer with command ADD_CHANNEL. |
| 33 | */ |
| 34 | int kernel_consumer_add_channel(int sock, struct ltt_kernel_channel *channel) |
| 35 | { |
| 36 | int ret; |
| 37 | struct lttcomm_consumer_msg lkm; |
| 38 | |
| 39 | /* Safety net */ |
| 40 | assert(channel); |
| 41 | |
| 42 | DBG("Kernel consumer adding channel %s to kernel consumer", |
| 43 | channel->channel->name); |
| 44 | |
| 45 | /* Prep channel message structure */ |
| 46 | consumer_init_channel_comm_msg(&lkm, |
| 47 | LTTNG_CONSUMER_ADD_CHANNEL, |
| 48 | channel->fd, |
| 49 | channel->channel->attr.subbuf_size, |
| 50 | 0, /* Kernel */ |
| 51 | channel->channel->name); |
| 52 | |
| 53 | ret = consumer_send_channel(sock, &lkm); |
| 54 | if (ret < 0) { |
| 55 | goto error; |
| 56 | } |
| 57 | |
| 58 | error: |
| 59 | return ret; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM. |
| 64 | */ |
| 65 | int kernel_consumer_add_metadata(int sock, struct ltt_kernel_session *session) |
| 66 | { |
| 67 | int ret; |
| 68 | char tmp_path[PATH_MAX]; |
| 69 | const char *pathname; |
| 70 | struct lttcomm_consumer_msg lkm; |
| 71 | struct consumer_output *consumer; |
| 72 | |
| 73 | /* Safety net */ |
| 74 | assert(session); |
| 75 | assert(session->consumer); |
| 76 | |
| 77 | DBG("Sending metadata %d to kernel consumer", session->metadata_stream_fd); |
| 78 | |
| 79 | /* Get consumer output pointer */ |
| 80 | consumer = session->consumer; |
| 81 | |
| 82 | /* Get the right path name destination */ |
| 83 | if (consumer->type == CONSUMER_DST_LOCAL) { |
| 84 | /* Set application path to the destination path */ |
| 85 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", |
| 86 | consumer->dst.trace_path, consumer->subdir); |
| 87 | if (ret < 0) { |
| 88 | PERROR("snprintf metadata path"); |
| 89 | goto error; |
| 90 | } |
| 91 | pathname = tmp_path; |
| 92 | |
| 93 | /* Create directory */ |
| 94 | ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, |
| 95 | session->uid, session->gid); |
| 96 | if (ret < 0) { |
| 97 | if (ret != -EEXIST) { |
| 98 | ERR("Trace directory creation error"); |
| 99 | goto error; |
| 100 | } |
| 101 | } |
| 102 | DBG3("Kernel local consumer tracefile path: %s", pathname); |
| 103 | } else { |
| 104 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir); |
| 105 | if (ret < 0) { |
| 106 | PERROR("snprintf metadata path"); |
| 107 | goto error; |
| 108 | } |
| 109 | pathname = tmp_path; |
| 110 | DBG3("Kernel network consumer subdir path: %s", pathname); |
| 111 | } |
| 112 | |
| 113 | /* Prep channel message structure */ |
| 114 | consumer_init_channel_comm_msg(&lkm, |
| 115 | LTTNG_CONSUMER_ADD_CHANNEL, |
| 116 | session->metadata->fd, |
| 117 | session->metadata->conf->attr.subbuf_size, |
| 118 | 0, /* for kernel */ |
| 119 | "metadata"); |
| 120 | |
| 121 | ret = consumer_send_channel(sock, &lkm); |
| 122 | if (ret < 0) { |
| 123 | goto error; |
| 124 | } |
| 125 | |
| 126 | /* Prep stream message structure */ |
| 127 | consumer_init_stream_comm_msg(&lkm, |
| 128 | LTTNG_CONSUMER_ADD_STREAM, |
| 129 | session->metadata->fd, |
| 130 | session->metadata_stream_fd, |
| 131 | LTTNG_CONSUMER_ACTIVE_STREAM, |
| 132 | DEFAULT_KERNEL_CHANNEL_OUTPUT, |
| 133 | 0, /* Kernel */ |
| 134 | session->uid, |
| 135 | session->gid, |
| 136 | consumer->net_seq_index, |
| 137 | 1, /* Metadata flag set */ |
| 138 | "metadata", |
| 139 | pathname); |
| 140 | |
| 141 | /* Send stream and file descriptor */ |
| 142 | ret = consumer_send_stream(sock, consumer, &lkm, |
| 143 | &session->metadata_stream_fd, 1); |
| 144 | if (ret < 0) { |
| 145 | goto error; |
| 146 | } |
| 147 | |
| 148 | error: |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Sending a single stream to the consumer with command ADD_STREAM. |
| 154 | */ |
| 155 | int kernel_consumer_add_stream(int sock, struct ltt_kernel_channel *channel, |
| 156 | struct ltt_kernel_stream *stream, struct ltt_kernel_session *session) |
| 157 | { |
| 158 | int ret; |
| 159 | char tmp_path[PATH_MAX]; |
| 160 | const char *pathname; |
| 161 | struct lttcomm_consumer_msg lkm; |
| 162 | struct consumer_output *consumer; |
| 163 | |
| 164 | assert(channel); |
| 165 | assert(stream); |
| 166 | assert(session); |
| 167 | assert(session->consumer); |
| 168 | |
| 169 | DBG("Sending stream %d of channel %s to kernel consumer", |
| 170 | stream->fd, channel->channel->name); |
| 171 | |
| 172 | /* Get consumer output pointer */ |
| 173 | consumer = session->consumer; |
| 174 | |
| 175 | /* Get the right path name destination */ |
| 176 | if (consumer->type == CONSUMER_DST_LOCAL) { |
| 177 | /* Set application path to the destination path */ |
| 178 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", |
| 179 | consumer->dst.trace_path, consumer->subdir); |
| 180 | if (ret < 0) { |
| 181 | PERROR("snprintf stream path"); |
| 182 | goto error; |
| 183 | } |
| 184 | pathname = tmp_path; |
| 185 | DBG3("Kernel local consumer tracefile path: %s", pathname); |
| 186 | } else { |
| 187 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir); |
| 188 | if (ret < 0) { |
| 189 | PERROR("snprintf stream path"); |
| 190 | goto error; |
| 191 | } |
| 192 | pathname = tmp_path; |
| 193 | DBG3("Kernel network consumer subdir path: %s", pathname); |
| 194 | } |
| 195 | |
| 196 | /* Prep stream consumer message */ |
| 197 | consumer_init_stream_comm_msg(&lkm, LTTNG_CONSUMER_ADD_STREAM, |
| 198 | channel->fd, |
| 199 | stream->fd, |
| 200 | stream->state, |
| 201 | channel->channel->attr.output, |
| 202 | 0, /* Kernel */ |
| 203 | session->uid, |
| 204 | session->gid, |
| 205 | consumer->net_seq_index, |
| 206 | 0, /* Metadata flag unset */ |
| 207 | stream->name, |
| 208 | pathname); |
| 209 | |
| 210 | /* Send stream and file descriptor */ |
| 211 | ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1); |
| 212 | if (ret < 0) { |
| 213 | goto error; |
| 214 | } |
| 215 | |
| 216 | error: |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Send all stream fds of kernel channel to the consumer. |
| 222 | */ |
| 223 | int kernel_consumer_send_channel_stream(int sock, |
| 224 | struct ltt_kernel_channel *channel, struct ltt_kernel_session *session) |
| 225 | { |
| 226 | int ret; |
| 227 | struct ltt_kernel_stream *stream; |
| 228 | |
| 229 | /* Safety net */ |
| 230 | assert(channel); |
| 231 | assert(session); |
| 232 | assert(session->consumer); |
| 233 | |
| 234 | /* Bail out if consumer is disabled */ |
| 235 | if (!session->consumer->enabled) { |
| 236 | ret = LTTCOMM_OK; |
| 237 | goto error; |
| 238 | } |
| 239 | |
| 240 | DBG("Sending streams of channel %s to kernel consumer", |
| 241 | channel->channel->name); |
| 242 | |
| 243 | ret = kernel_consumer_add_channel(sock, channel); |
| 244 | if (ret < 0) { |
| 245 | goto error; |
| 246 | } |
| 247 | |
| 248 | /* Send streams */ |
| 249 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 250 | if (!stream->fd) { |
| 251 | continue; |
| 252 | } |
| 253 | |
| 254 | /* Add stream on the kernel consumer side. */ |
| 255 | ret = kernel_consumer_add_stream(sock, channel, stream, session); |
| 256 | if (ret < 0) { |
| 257 | goto error; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | error: |
| 262 | return ret; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Send all stream fds of the kernel session to the consumer. |
| 267 | */ |
| 268 | int kernel_consumer_send_session(int sock, struct ltt_kernel_session *session) |
| 269 | { |
| 270 | int ret; |
| 271 | struct ltt_kernel_channel *chan; |
| 272 | |
| 273 | /* Safety net */ |
| 274 | assert(session); |
| 275 | assert(session->consumer); |
| 276 | |
| 277 | /* Bail out if consumer is disabled */ |
| 278 | if (!session->consumer->enabled) { |
| 279 | ret = LTTCOMM_OK; |
| 280 | goto error; |
| 281 | } |
| 282 | |
| 283 | DBG("Sending session stream to kernel consumer"); |
| 284 | |
| 285 | if (session->metadata_stream_fd >= 0) { |
| 286 | ret = kernel_consumer_add_metadata(sock, session); |
| 287 | if (ret < 0) { |
| 288 | goto error; |
| 289 | } |
| 290 | |
| 291 | /* Flag that at least the metadata has been sent to the consumer. */ |
| 292 | session->consumer_fds_sent = 1; |
| 293 | } |
| 294 | |
| 295 | /* Send channel and streams of it */ |
| 296 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 297 | ret = kernel_consumer_send_channel_stream(sock, chan, session); |
| 298 | if (ret < 0) { |
| 299 | goto error; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | DBG("Kernel consumer FDs of metadata and channel streams sent"); |
| 304 | |
| 305 | return 0; |
| 306 | |
| 307 | error: |
| 308 | return ret; |
| 309 | } |