Commit | Line | Data |
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f1e16794 DG |
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> | |
f1e16794 | 27 | |
00e2e675 | 28 | #include "consumer.h" |
7972aab2 | 29 | #include "health.h" |
f1e16794 DG |
30 | #include "kernel-consumer.h" |
31 | ||
2bba9e53 DG |
32 | static char *create_channel_path(struct consumer_output *consumer, |
33 | uid_t uid, gid_t gid) | |
00e2e675 DG |
34 | { |
35 | int ret; | |
ffe60014 | 36 | char tmp_path[PATH_MAX]; |
2bba9e53 | 37 | char *pathname = NULL; |
00e2e675 | 38 | |
2bba9e53 | 39 | assert(consumer); |
00e2e675 | 40 | |
ffe60014 DG |
41 | /* Get the right path name destination */ |
42 | if (consumer->type == CONSUMER_DST_LOCAL) { | |
43 | /* Set application path to the destination path */ | |
dec56f6c | 44 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s%s", |
ffe60014 DG |
45 | consumer->dst.trace_path, consumer->subdir); |
46 | if (ret < 0) { | |
2bba9e53 | 47 | PERROR("snprintf kernel channel path"); |
ffe60014 DG |
48 | goto error; |
49 | } | |
2bba9e53 | 50 | pathname = strndup(tmp_path, sizeof(tmp_path)); |
ffe60014 DG |
51 | |
52 | /* Create directory */ | |
2bba9e53 | 53 | ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, uid, gid); |
ffe60014 DG |
54 | if (ret < 0) { |
55 | if (ret != -EEXIST) { | |
56 | ERR("Trace directory creation error"); | |
57 | goto error; | |
58 | } | |
59 | } | |
60 | DBG3("Kernel local consumer tracefile path: %s", pathname); | |
61 | } else { | |
62 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir); | |
63 | if (ret < 0) { | |
2bba9e53 | 64 | PERROR("snprintf kernel metadata path"); |
ffe60014 DG |
65 | goto error; |
66 | } | |
2bba9e53 | 67 | pathname = strndup(tmp_path, sizeof(tmp_path)); |
ffe60014 DG |
68 | DBG3("Kernel network consumer subdir path: %s", pathname); |
69 | } | |
70 | ||
2bba9e53 DG |
71 | return pathname; |
72 | ||
73 | error: | |
74 | free(pathname); | |
75 | return NULL; | |
76 | } | |
77 | ||
78 | /* | |
79 | * Sending a single channel to the consumer with command ADD_CHANNEL. | |
80 | */ | |
81 | int kernel_consumer_add_channel(struct consumer_socket *sock, | |
82 | struct ltt_kernel_channel *channel, struct ltt_kernel_session *session, | |
83 | unsigned int monitor) | |
84 | { | |
85 | int ret; | |
86 | char *pathname; | |
87 | struct lttcomm_consumer_msg lkm; | |
88 | struct consumer_output *consumer; | |
89 | ||
90 | /* Safety net */ | |
91 | assert(channel); | |
92 | assert(session); | |
93 | assert(session->consumer); | |
94 | ||
95 | consumer = session->consumer; | |
96 | ||
97 | DBG("Kernel consumer adding channel %s to kernel consumer", | |
98 | channel->channel->name); | |
99 | ||
100 | if (monitor) { | |
101 | pathname = create_channel_path(consumer, session->uid, session->gid); | |
102 | if (!pathname) { | |
103 | ret = -1; | |
104 | goto error; | |
105 | } | |
106 | } else { | |
107 | /* Empty path. */ | |
108 | pathname = ""; | |
109 | } | |
110 | ||
00e2e675 DG |
111 | /* Prep channel message structure */ |
112 | consumer_init_channel_comm_msg(&lkm, | |
113 | LTTNG_CONSUMER_ADD_CHANNEL, | |
114 | channel->fd, | |
ffe60014 DG |
115 | session->id, |
116 | pathname, | |
117 | session->uid, | |
118 | session->gid, | |
119 | consumer->net_seq_index, | |
c30aaa51 | 120 | channel->channel->name, |
ffe60014 DG |
121 | channel->stream_count, |
122 | channel->channel->attr.output, | |
1624d5b7 JD |
123 | CONSUMER_CHANNEL_TYPE_DATA, |
124 | channel->channel->attr.tracefile_size, | |
2bba9e53 DG |
125 | channel->channel->attr.tracefile_count, |
126 | monitor); | |
00e2e675 | 127 | |
840cb59c | 128 | health_code_update(); |
ca03de58 | 129 | |
00e2e675 DG |
130 | ret = consumer_send_channel(sock, &lkm); |
131 | if (ret < 0) { | |
132 | goto error; | |
133 | } | |
134 | ||
840cb59c | 135 | health_code_update(); |
ca03de58 | 136 | |
00e2e675 DG |
137 | error: |
138 | return ret; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM. | |
143 | */ | |
f50f23d9 | 144 | int kernel_consumer_add_metadata(struct consumer_socket *sock, |
2bba9e53 | 145 | struct ltt_kernel_session *session, unsigned int monitor) |
00e2e675 DG |
146 | { |
147 | int ret; | |
2bba9e53 | 148 | char *pathname; |
00e2e675 | 149 | struct lttcomm_consumer_msg lkm; |
a7d9a3e7 | 150 | struct consumer_output *consumer; |
00e2e675 DG |
151 | |
152 | /* Safety net */ | |
153 | assert(session); | |
154 | assert(session->consumer); | |
f50f23d9 | 155 | assert(sock); |
00e2e675 DG |
156 | |
157 | DBG("Sending metadata %d to kernel consumer", session->metadata_stream_fd); | |
158 | ||
159 | /* Get consumer output pointer */ | |
a7d9a3e7 | 160 | consumer = session->consumer; |
00e2e675 | 161 | |
2bba9e53 DG |
162 | if (monitor) { |
163 | pathname = create_channel_path(consumer, session->uid, session->gid); | |
164 | if (!pathname) { | |
165 | ret = -1; | |
a7d9a3e7 DG |
166 | goto error; |
167 | } | |
00e2e675 | 168 | } else { |
2bba9e53 DG |
169 | /* Empty path. */ |
170 | pathname = ""; | |
00e2e675 DG |
171 | } |
172 | ||
173 | /* Prep channel message structure */ | |
174 | consumer_init_channel_comm_msg(&lkm, | |
175 | LTTNG_CONSUMER_ADD_CHANNEL, | |
176 | session->metadata->fd, | |
ffe60014 DG |
177 | session->id, |
178 | pathname, | |
179 | session->uid, | |
180 | session->gid, | |
181 | consumer->net_seq_index, | |
30079b6b | 182 | DEFAULT_METADATA_NAME, |
ffe60014 DG |
183 | 1, |
184 | DEFAULT_KERNEL_CHANNEL_OUTPUT, | |
1624d5b7 | 185 | CONSUMER_CHANNEL_TYPE_METADATA, |
2bba9e53 DG |
186 | 0, 0, |
187 | monitor); | |
00e2e675 | 188 | |
840cb59c | 189 | health_code_update(); |
ca03de58 | 190 | |
00e2e675 DG |
191 | ret = consumer_send_channel(sock, &lkm); |
192 | if (ret < 0) { | |
193 | goto error; | |
194 | } | |
195 | ||
840cb59c | 196 | health_code_update(); |
ca03de58 | 197 | |
00e2e675 DG |
198 | /* Prep stream message structure */ |
199 | consumer_init_stream_comm_msg(&lkm, | |
200 | LTTNG_CONSUMER_ADD_STREAM, | |
201 | session->metadata->fd, | |
202 | session->metadata_stream_fd, | |
1624d5b7 | 203 | 0); /* CPU: 0 for metadata. */ |
00e2e675 | 204 | |
6dc3064a DG |
205 | /* |
206 | * Set the no monitor flag. If set to 1, it indicates the consumer to NOT | |
207 | * monitor the stream but rather add it to a special list in the associated | |
208 | * channel. This is used to handle ephemeral stream used by the snapshot | |
209 | * command or store streams for the flight recorder mode. | |
210 | */ | |
211 | lkm.u.stream.no_monitor = no_monitor; | |
212 | ||
840cb59c | 213 | health_code_update(); |
ca03de58 | 214 | |
00e2e675 | 215 | /* Send stream and file descriptor */ |
a7d9a3e7 | 216 | ret = consumer_send_stream(sock, consumer, &lkm, |
00e2e675 DG |
217 | &session->metadata_stream_fd, 1); |
218 | if (ret < 0) { | |
219 | goto error; | |
220 | } | |
221 | ||
840cb59c | 222 | health_code_update(); |
ca03de58 | 223 | |
00e2e675 DG |
224 | error: |
225 | return ret; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Sending a single stream to the consumer with command ADD_STREAM. | |
230 | */ | |
f50f23d9 DG |
231 | int kernel_consumer_add_stream(struct consumer_socket *sock, |
232 | struct ltt_kernel_channel *channel, struct ltt_kernel_stream *stream, | |
2bba9e53 | 233 | struct ltt_kernel_session *session, unsigned int monitor) |
00e2e675 DG |
234 | { |
235 | int ret; | |
00e2e675 | 236 | struct lttcomm_consumer_msg lkm; |
a7d9a3e7 | 237 | struct consumer_output *consumer; |
00e2e675 DG |
238 | |
239 | assert(channel); | |
240 | assert(stream); | |
241 | assert(session); | |
242 | assert(session->consumer); | |
f50f23d9 | 243 | assert(sock); |
00e2e675 DG |
244 | |
245 | DBG("Sending stream %d of channel %s to kernel consumer", | |
246 | stream->fd, channel->channel->name); | |
247 | ||
248 | /* Get consumer output pointer */ | |
a7d9a3e7 | 249 | consumer = session->consumer; |
00e2e675 | 250 | |
00e2e675 | 251 | /* Prep stream consumer message */ |
ffe60014 DG |
252 | consumer_init_stream_comm_msg(&lkm, |
253 | LTTNG_CONSUMER_ADD_STREAM, | |
00e2e675 DG |
254 | channel->fd, |
255 | stream->fd, | |
ffe60014 | 256 | stream->cpu); |
00e2e675 | 257 | |
840cb59c | 258 | health_code_update(); |
ca03de58 | 259 | |
00e2e675 | 260 | /* Send stream and file descriptor */ |
a7d9a3e7 | 261 | ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1); |
00e2e675 DG |
262 | if (ret < 0) { |
263 | goto error; | |
264 | } | |
265 | ||
840cb59c | 266 | health_code_update(); |
ca03de58 | 267 | |
00e2e675 DG |
268 | error: |
269 | return ret; | |
270 | } | |
271 | ||
f1e16794 DG |
272 | /* |
273 | * Send all stream fds of kernel channel to the consumer. | |
274 | */ | |
f50f23d9 | 275 | int kernel_consumer_send_channel_stream(struct consumer_socket *sock, |
2bba9e53 DG |
276 | struct ltt_kernel_channel *channel, struct ltt_kernel_session *session, |
277 | unsigned int monitor) | |
f1e16794 | 278 | { |
00e2e675 | 279 | int ret; |
f1e16794 | 280 | struct ltt_kernel_stream *stream; |
00e2e675 DG |
281 | |
282 | /* Safety net */ | |
283 | assert(channel); | |
284 | assert(session); | |
285 | assert(session->consumer); | |
f50f23d9 | 286 | assert(sock); |
00e2e675 DG |
287 | |
288 | /* Bail out if consumer is disabled */ | |
289 | if (!session->consumer->enabled) { | |
f73fabfd | 290 | ret = LTTNG_OK; |
00e2e675 DG |
291 | goto error; |
292 | } | |
f1e16794 DG |
293 | |
294 | DBG("Sending streams of channel %s to kernel consumer", | |
295 | channel->channel->name); | |
296 | ||
2bba9e53 | 297 | ret = kernel_consumer_add_channel(sock, channel, session, monitor); |
f1e16794 | 298 | if (ret < 0) { |
f1e16794 DG |
299 | goto error; |
300 | } | |
301 | ||
302 | /* Send streams */ | |
303 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
304 | if (!stream->fd) { | |
305 | continue; | |
306 | } | |
00e2e675 DG |
307 | |
308 | /* Add stream on the kernel consumer side. */ | |
2bba9e53 DG |
309 | ret = kernel_consumer_add_stream(sock, channel, stream, session, |
310 | monitor); | |
f1e16794 | 311 | if (ret < 0) { |
f1e16794 DG |
312 | goto error; |
313 | } | |
314 | } | |
315 | ||
f1e16794 DG |
316 | error: |
317 | return ret; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Send all stream fds of the kernel session to the consumer. | |
322 | */ | |
f50f23d9 DG |
323 | int kernel_consumer_send_session(struct consumer_socket *sock, |
324 | struct ltt_kernel_session *session) | |
f1e16794 | 325 | { |
2bba9e53 | 326 | int ret, monitor = 0; |
f1e16794 | 327 | struct ltt_kernel_channel *chan; |
f1e16794 | 328 | |
00e2e675 DG |
329 | /* Safety net */ |
330 | assert(session); | |
331 | assert(session->consumer); | |
f50f23d9 | 332 | assert(sock); |
f1e16794 | 333 | |
00e2e675 DG |
334 | /* Bail out if consumer is disabled */ |
335 | if (!session->consumer->enabled) { | |
f73fabfd | 336 | ret = LTTNG_OK; |
00e2e675 | 337 | goto error; |
f1e16794 DG |
338 | } |
339 | ||
2bba9e53 DG |
340 | /* Don't monitor the streams on the consumer if in flight recorder. */ |
341 | if (session->output_traces) { | |
342 | monitor = 1; | |
343 | } | |
344 | ||
00e2e675 DG |
345 | DBG("Sending session stream to kernel consumer"); |
346 | ||
f1e16794 | 347 | if (session->metadata_stream_fd >= 0) { |
2bba9e53 | 348 | ret = kernel_consumer_add_metadata(sock, session, monitor); |
f1e16794 | 349 | if (ret < 0) { |
f1e16794 DG |
350 | goto error; |
351 | } | |
352 | ||
00e2e675 DG |
353 | /* Flag that at least the metadata has been sent to the consumer. */ |
354 | session->consumer_fds_sent = 1; | |
f1e16794 DG |
355 | } |
356 | ||
00e2e675 | 357 | /* Send channel and streams of it */ |
f1e16794 | 358 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bba9e53 DG |
359 | ret = kernel_consumer_send_channel_stream(sock, chan, session, |
360 | monitor); | |
f1e16794 DG |
361 | if (ret < 0) { |
362 | goto error; | |
363 | } | |
364 | } | |
365 | ||
00e2e675 | 366 | DBG("Kernel consumer FDs of metadata and channel streams sent"); |
f1e16794 DG |
367 | |
368 | return 0; | |
369 | ||
370 | error: | |
371 | return ret; | |
372 | } |