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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" |
f1e16794 DG |
29 | #include "kernel-consumer.h" |
30 | ||
00e2e675 DG |
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 */ | |
c30aaa51 MD |
51 | channel->channel->name, |
52 | channel->stream_count); | |
00e2e675 DG |
53 | |
54 | ret = consumer_send_channel(sock, &lkm); | |
55 | if (ret < 0) { | |
56 | goto error; | |
57 | } | |
58 | ||
59 | error: | |
60 | return ret; | |
61 | } | |
62 | ||
63 | /* | |
64 | * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM. | |
65 | */ | |
66 | int kernel_consumer_add_metadata(int sock, struct ltt_kernel_session *session) | |
67 | { | |
68 | int ret; | |
a7d9a3e7 | 69 | char tmp_path[PATH_MAX]; |
00e2e675 DG |
70 | const char *pathname; |
71 | struct lttcomm_consumer_msg lkm; | |
a7d9a3e7 | 72 | struct consumer_output *consumer; |
00e2e675 DG |
73 | |
74 | /* Safety net */ | |
75 | assert(session); | |
76 | assert(session->consumer); | |
77 | ||
78 | DBG("Sending metadata %d to kernel consumer", session->metadata_stream_fd); | |
79 | ||
80 | /* Get consumer output pointer */ | |
a7d9a3e7 | 81 | consumer = session->consumer; |
00e2e675 | 82 | |
a7d9a3e7 DG |
83 | /* Get the right path name destination */ |
84 | if (consumer->type == CONSUMER_DST_LOCAL) { | |
85 | /* Set application path to the destination path */ | |
86 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", | |
87 | consumer->dst.trace_path, consumer->subdir); | |
88 | if (ret < 0) { | |
89 | PERROR("snprintf metadata path"); | |
90 | goto error; | |
91 | } | |
92 | pathname = tmp_path; | |
93 | ||
94 | /* Create directory */ | |
95 | ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, | |
96 | session->uid, session->gid); | |
97 | if (ret < 0) { | |
98 | if (ret != -EEXIST) { | |
99 | ERR("Trace directory creation error"); | |
100 | goto error; | |
101 | } | |
102 | } | |
103 | DBG3("Kernel local consumer tracefile path: %s", pathname); | |
00e2e675 | 104 | } else { |
a7d9a3e7 DG |
105 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir); |
106 | if (ret < 0) { | |
107 | PERROR("snprintf metadata path"); | |
108 | goto error; | |
109 | } | |
110 | pathname = tmp_path; | |
111 | DBG3("Kernel network consumer subdir path: %s", pathname); | |
00e2e675 DG |
112 | } |
113 | ||
114 | /* Prep channel message structure */ | |
115 | consumer_init_channel_comm_msg(&lkm, | |
116 | LTTNG_CONSUMER_ADD_CHANNEL, | |
117 | session->metadata->fd, | |
118 | session->metadata->conf->attr.subbuf_size, | |
119 | 0, /* for kernel */ | |
c30aaa51 MD |
120 | "metadata", |
121 | 1); | |
00e2e675 DG |
122 | |
123 | ret = consumer_send_channel(sock, &lkm); | |
124 | if (ret < 0) { | |
125 | goto error; | |
126 | } | |
127 | ||
128 | /* Prep stream message structure */ | |
129 | consumer_init_stream_comm_msg(&lkm, | |
130 | LTTNG_CONSUMER_ADD_STREAM, | |
131 | session->metadata->fd, | |
132 | session->metadata_stream_fd, | |
133 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
134 | DEFAULT_KERNEL_CHANNEL_OUTPUT, | |
135 | 0, /* Kernel */ | |
136 | session->uid, | |
137 | session->gid, | |
a7d9a3e7 | 138 | consumer->net_seq_index, |
00e2e675 DG |
139 | 1, /* Metadata flag set */ |
140 | "metadata", | |
141 | pathname); | |
142 | ||
143 | /* Send stream and file descriptor */ | |
a7d9a3e7 | 144 | ret = consumer_send_stream(sock, consumer, &lkm, |
00e2e675 DG |
145 | &session->metadata_stream_fd, 1); |
146 | if (ret < 0) { | |
147 | goto error; | |
148 | } | |
149 | ||
150 | error: | |
151 | return ret; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Sending a single stream to the consumer with command ADD_STREAM. | |
156 | */ | |
157 | int kernel_consumer_add_stream(int sock, struct ltt_kernel_channel *channel, | |
158 | struct ltt_kernel_stream *stream, struct ltt_kernel_session *session) | |
159 | { | |
160 | int ret; | |
a7d9a3e7 | 161 | char tmp_path[PATH_MAX]; |
00e2e675 DG |
162 | const char *pathname; |
163 | struct lttcomm_consumer_msg lkm; | |
a7d9a3e7 | 164 | struct consumer_output *consumer; |
00e2e675 DG |
165 | |
166 | assert(channel); | |
167 | assert(stream); | |
168 | assert(session); | |
169 | assert(session->consumer); | |
170 | ||
171 | DBG("Sending stream %d of channel %s to kernel consumer", | |
172 | stream->fd, channel->channel->name); | |
173 | ||
174 | /* Get consumer output pointer */ | |
a7d9a3e7 | 175 | consumer = session->consumer; |
00e2e675 | 176 | |
a7d9a3e7 DG |
177 | /* Get the right path name destination */ |
178 | if (consumer->type == CONSUMER_DST_LOCAL) { | |
179 | /* Set application path to the destination path */ | |
180 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s", | |
181 | consumer->dst.trace_path, consumer->subdir); | |
182 | if (ret < 0) { | |
183 | PERROR("snprintf stream path"); | |
184 | goto error; | |
185 | } | |
186 | pathname = tmp_path; | |
187 | DBG3("Kernel local consumer tracefile path: %s", pathname); | |
00e2e675 | 188 | } else { |
a7d9a3e7 DG |
189 | ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir); |
190 | if (ret < 0) { | |
191 | PERROR("snprintf stream path"); | |
192 | goto error; | |
193 | } | |
194 | pathname = tmp_path; | |
195 | DBG3("Kernel network consumer subdir path: %s", pathname); | |
00e2e675 DG |
196 | } |
197 | ||
198 | /* Prep stream consumer message */ | |
199 | consumer_init_stream_comm_msg(&lkm, LTTNG_CONSUMER_ADD_STREAM, | |
200 | channel->fd, | |
201 | stream->fd, | |
202 | stream->state, | |
203 | channel->channel->attr.output, | |
204 | 0, /* Kernel */ | |
205 | session->uid, | |
206 | session->gid, | |
a7d9a3e7 | 207 | consumer->net_seq_index, |
00e2e675 DG |
208 | 0, /* Metadata flag unset */ |
209 | stream->name, | |
210 | pathname); | |
211 | ||
212 | /* Send stream and file descriptor */ | |
a7d9a3e7 | 213 | ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1); |
00e2e675 DG |
214 | if (ret < 0) { |
215 | goto error; | |
216 | } | |
217 | ||
218 | error: | |
219 | return ret; | |
220 | } | |
221 | ||
f1e16794 DG |
222 | /* |
223 | * Send all stream fds of kernel channel to the consumer. | |
224 | */ | |
00e2e675 DG |
225 | int kernel_consumer_send_channel_stream(int sock, |
226 | struct ltt_kernel_channel *channel, struct ltt_kernel_session *session) | |
f1e16794 | 227 | { |
00e2e675 | 228 | int ret; |
f1e16794 | 229 | struct ltt_kernel_stream *stream; |
00e2e675 DG |
230 | |
231 | /* Safety net */ | |
232 | assert(channel); | |
233 | assert(session); | |
234 | assert(session->consumer); | |
235 | ||
236 | /* Bail out if consumer is disabled */ | |
237 | if (!session->consumer->enabled) { | |
f73fabfd | 238 | ret = LTTNG_OK; |
00e2e675 DG |
239 | goto error; |
240 | } | |
f1e16794 DG |
241 | |
242 | DBG("Sending streams of channel %s to kernel consumer", | |
243 | channel->channel->name); | |
244 | ||
00e2e675 | 245 | ret = kernel_consumer_add_channel(sock, channel); |
f1e16794 | 246 | if (ret < 0) { |
f1e16794 DG |
247 | goto error; |
248 | } | |
249 | ||
250 | /* Send streams */ | |
251 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
252 | if (!stream->fd) { | |
253 | continue; | |
254 | } | |
00e2e675 DG |
255 | |
256 | /* Add stream on the kernel consumer side. */ | |
257 | ret = kernel_consumer_add_stream(sock, channel, stream, session); | |
f1e16794 | 258 | if (ret < 0) { |
f1e16794 DG |
259 | goto error; |
260 | } | |
261 | } | |
262 | ||
f1e16794 DG |
263 | error: |
264 | return ret; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Send all stream fds of the kernel session to the consumer. | |
269 | */ | |
00e2e675 | 270 | int kernel_consumer_send_session(int sock, struct ltt_kernel_session *session) |
f1e16794 DG |
271 | { |
272 | int ret; | |
273 | struct ltt_kernel_channel *chan; | |
f1e16794 | 274 | |
00e2e675 DG |
275 | /* Safety net */ |
276 | assert(session); | |
277 | assert(session->consumer); | |
f1e16794 | 278 | |
00e2e675 DG |
279 | /* Bail out if consumer is disabled */ |
280 | if (!session->consumer->enabled) { | |
f73fabfd | 281 | ret = LTTNG_OK; |
00e2e675 | 282 | goto error; |
f1e16794 DG |
283 | } |
284 | ||
00e2e675 DG |
285 | DBG("Sending session stream to kernel consumer"); |
286 | ||
f1e16794 | 287 | if (session->metadata_stream_fd >= 0) { |
00e2e675 | 288 | ret = kernel_consumer_add_metadata(sock, session); |
f1e16794 | 289 | if (ret < 0) { |
f1e16794 DG |
290 | goto error; |
291 | } | |
292 | ||
00e2e675 DG |
293 | /* Flag that at least the metadata has been sent to the consumer. */ |
294 | session->consumer_fds_sent = 1; | |
f1e16794 DG |
295 | } |
296 | ||
00e2e675 | 297 | /* Send channel and streams of it */ |
f1e16794 | 298 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
00e2e675 | 299 | ret = kernel_consumer_send_channel_stream(sock, chan, session); |
f1e16794 DG |
300 | if (ret < 0) { |
301 | goto error; | |
302 | } | |
303 | } | |
304 | ||
00e2e675 | 305 | DBG("Kernel consumer FDs of metadata and channel streams sent"); |
f1e16794 DG |
306 | |
307 | return 0; | |
308 | ||
309 | error: | |
310 | return ret; | |
311 | } |