Commit | Line | Data |
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00e2e675 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 <assert.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <sys/stat.h> | |
77c7c900 | 24 | #include <inttypes.h> |
00e2e675 DG |
25 | |
26 | #include <common/common.h> | |
27 | #include <common/defaults.h> | |
28 | #include <common/sessiond-comm/relayd.h> | |
29 | ||
30 | #include "relayd.h" | |
31 | ||
32 | /* | |
33 | * Send command. Fill up the header and append the data. | |
34 | */ | |
35 | static int send_command(struct lttcomm_sock *sock, | |
36 | enum lttcomm_sessiond_command cmd, void *data, size_t size, | |
37 | int flags) | |
38 | { | |
39 | int ret; | |
40 | struct lttcomm_relayd_hdr header; | |
41 | char *buf; | |
42 | uint64_t buf_size = sizeof(header); | |
43 | ||
44 | if (data) { | |
45 | buf_size += size; | |
46 | } | |
47 | ||
48 | buf = zmalloc(buf_size); | |
49 | if (buf == NULL) { | |
50 | PERROR("zmalloc relayd send command buf"); | |
51 | ret = -1; | |
52 | goto alloc_error; | |
53 | } | |
54 | ||
55 | header.cmd = htobe32(cmd); | |
56 | header.data_size = htobe64(size); | |
57 | ||
58 | /* Zeroed for now since not used. */ | |
59 | header.cmd_version = 0; | |
60 | header.circuit_id = 0; | |
61 | ||
62 | /* Prepare buffer to send. */ | |
63 | memcpy(buf, &header, sizeof(header)); | |
64 | if (data) { | |
65 | memcpy(buf + sizeof(header), data, size); | |
66 | } | |
67 | ||
68 | ret = sock->ops->sendmsg(sock, buf, buf_size, flags); | |
69 | if (ret < 0) { | |
8994307f | 70 | ret = -errno; |
00e2e675 DG |
71 | goto error; |
72 | } | |
73 | ||
633d0084 | 74 | DBG3("Relayd sending command %d of size %" PRIu64, cmd, buf_size); |
00e2e675 DG |
75 | |
76 | error: | |
77 | free(buf); | |
78 | alloc_error: | |
79 | return ret; | |
80 | } | |
81 | ||
82 | /* | |
83 | * Receive reply data on socket. This MUST be call after send_command or else | |
84 | * could result in unexpected behavior(s). | |
85 | */ | |
86 | static int recv_reply(struct lttcomm_sock *sock, void *data, size_t size) | |
87 | { | |
88 | int ret; | |
89 | ||
633d0084 | 90 | DBG3("Relayd waiting for reply of size %ld", size); |
00e2e675 DG |
91 | |
92 | ret = sock->ops->recvmsg(sock, data, size, 0); | |
93 | if (ret < 0) { | |
8994307f | 94 | ret = -errno; |
00e2e675 DG |
95 | goto error; |
96 | } | |
97 | ||
98 | error: | |
99 | return ret; | |
100 | } | |
101 | ||
00e2e675 DG |
102 | /* |
103 | * Add stream on the relayd and assign stream handle to the stream_id argument. | |
104 | * | |
105 | * On success return 0 else return ret_code negative value. | |
106 | */ | |
107 | int relayd_add_stream(struct lttcomm_sock *sock, const char *channel_name, | |
108 | const char *pathname, uint64_t *stream_id) | |
109 | { | |
110 | int ret; | |
111 | struct lttcomm_relayd_add_stream msg; | |
112 | struct lttcomm_relayd_status_stream reply; | |
113 | ||
114 | /* Code flow error. Safety net. */ | |
115 | assert(sock); | |
116 | assert(channel_name); | |
117 | assert(pathname); | |
118 | ||
119 | DBG("Relayd adding stream for channel name %s", channel_name); | |
120 | ||
121 | strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name)); | |
122 | strncpy(msg.pathname, pathname, sizeof(msg.pathname)); | |
123 | ||
124 | /* Send command */ | |
125 | ret = send_command(sock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0); | |
126 | if (ret < 0) { | |
127 | goto error; | |
128 | } | |
129 | ||
633d0084 | 130 | /* Waiting for reply */ |
00e2e675 DG |
131 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); |
132 | if (ret < 0) { | |
133 | goto error; | |
134 | } | |
135 | ||
136 | /* Back to host bytes order. */ | |
137 | reply.handle = be64toh(reply.handle); | |
138 | reply.ret_code = be32toh(reply.ret_code); | |
139 | ||
140 | /* Return session id or negative ret code. */ | |
f73fabfd | 141 | if (reply.ret_code != LTTNG_OK) { |
00e2e675 DG |
142 | ret = -reply.ret_code; |
143 | ERR("Relayd add stream replied error %d", ret); | |
144 | } else { | |
145 | /* Success */ | |
146 | ret = 0; | |
147 | *stream_id = reply.handle; | |
148 | } | |
149 | ||
77c7c900 MD |
150 | DBG("Relayd stream added successfully with handle %" PRIu64, |
151 | reply.handle); | |
00e2e675 DG |
152 | |
153 | error: | |
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Check version numbers on the relayd. | |
159 | * | |
160 | * Return 0 if compatible else negative value. | |
161 | */ | |
162 | int relayd_version_check(struct lttcomm_sock *sock, uint32_t major, | |
163 | uint32_t minor) | |
164 | { | |
165 | int ret; | |
092b6259 | 166 | struct lttcomm_relayd_version msg; |
00e2e675 DG |
167 | |
168 | /* Code flow error. Safety net. */ | |
169 | assert(sock); | |
170 | ||
171 | DBG("Relayd version check for major.minor %u.%u", major, minor); | |
172 | ||
092b6259 DG |
173 | /* Prepare network byte order before transmission. */ |
174 | msg.major = htobe32(major); | |
175 | msg.minor = htobe32(minor); | |
176 | ||
00e2e675 | 177 | /* Send command */ |
092b6259 | 178 | ret = send_command(sock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0); |
00e2e675 DG |
179 | if (ret < 0) { |
180 | goto error; | |
181 | } | |
182 | ||
183 | /* Recevie response */ | |
092b6259 | 184 | ret = recv_reply(sock, (void *) &msg, sizeof(msg)); |
00e2e675 DG |
185 | if (ret < 0) { |
186 | goto error; | |
187 | } | |
188 | ||
189 | /* Set back to host bytes order */ | |
092b6259 DG |
190 | msg.major = be32toh(msg.major); |
191 | msg.minor = be32toh(msg.minor); | |
192 | ||
193 | /* | |
194 | * Only validate the major version. If the other side is higher, | |
195 | * communication is not possible. Only major version equal can talk to each | |
196 | * other. If the minor version differs, the lowest version is used by both | |
197 | * sides. | |
198 | * | |
199 | * For now, before 2.1.0 stable release, we don't have to check the minor | |
200 | * because this new mechanism with the relayd will only be available with | |
201 | * 2.1 and NOT 2.0.x. | |
202 | */ | |
203 | if (msg.major == major) { | |
204 | /* Compatible */ | |
205 | ret = 0; | |
206 | DBG2("Relayd version is compatible"); | |
207 | goto error; | |
00e2e675 DG |
208 | } |
209 | ||
092b6259 DG |
210 | /* |
211 | * After 2.1.0 release, for the 2.2 release, at this point will have to | |
212 | * check the minor version in order for the session daemon to know which | |
213 | * structure to use to communicate with the relayd. If the relayd's minor | |
214 | * version is higher, it will adapt to our version so we can continue to | |
215 | * use the latest relayd communication data structure. | |
216 | */ | |
217 | ||
00e2e675 | 218 | /* Version number not compatible */ |
092b6259 DG |
219 | DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)", |
220 | msg.major, major); | |
00e2e675 DG |
221 | ret = -1; |
222 | ||
223 | error: | |
224 | return ret; | |
225 | } | |
226 | ||
00e2e675 DG |
227 | /* |
228 | * Add stream on the relayd and assign stream handle to the stream_id argument. | |
229 | * | |
230 | * On success return 0 else return ret_code negative value. | |
231 | */ | |
232 | int relayd_send_metadata(struct lttcomm_sock *sock, size_t len) | |
233 | { | |
234 | int ret; | |
235 | ||
236 | /* Code flow error. Safety net. */ | |
237 | assert(sock); | |
238 | ||
77c7c900 | 239 | DBG("Relayd sending metadata of size %zu", len); |
00e2e675 DG |
240 | |
241 | /* Send command */ | |
242 | ret = send_command(sock, RELAYD_SEND_METADATA, NULL, len, 0); | |
243 | if (ret < 0) { | |
244 | goto error; | |
245 | } | |
246 | ||
247 | DBG2("Relayd metadata added successfully"); | |
248 | ||
249 | /* | |
250 | * After that call, the metadata data MUST be sent to the relayd so the | |
251 | * receive size on the other end matches the len of the metadata packet | |
633d0084 | 252 | * header. This is why we don't wait for a reply here. |
00e2e675 DG |
253 | */ |
254 | ||
255 | error: | |
256 | return ret; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Connect to relay daemon with an allocated lttcomm_sock. | |
261 | */ | |
262 | int relayd_connect(struct lttcomm_sock *sock) | |
263 | { | |
264 | /* Code flow error. Safety net. */ | |
265 | assert(sock); | |
266 | ||
267 | DBG3("Relayd connect ..."); | |
268 | ||
269 | return sock->ops->connect(sock); | |
270 | } | |
271 | ||
272 | /* | |
273 | * Close relayd socket with an allocated lttcomm_sock. | |
274 | */ | |
275 | int relayd_close(struct lttcomm_sock *sock) | |
276 | { | |
277 | /* Code flow error. Safety net. */ | |
278 | assert(sock); | |
279 | ||
280 | DBG3("Relayd closing socket %d", sock->fd); | |
281 | ||
282 | return sock->ops->close(sock); | |
283 | } | |
284 | ||
285 | /* | |
286 | * Send data header structure to the relayd. | |
287 | */ | |
288 | int relayd_send_data_hdr(struct lttcomm_sock *sock, | |
289 | struct lttcomm_relayd_data_hdr *hdr, size_t size) | |
290 | { | |
291 | int ret; | |
292 | ||
293 | /* Code flow error. Safety net. */ | |
294 | assert(sock); | |
295 | assert(hdr); | |
296 | ||
633d0084 | 297 | DBG3("Relayd sending data header of size %ld", size); |
00e2e675 DG |
298 | |
299 | /* Again, safety net */ | |
300 | if (size == 0) { | |
301 | size = sizeof(struct lttcomm_relayd_data_hdr); | |
302 | } | |
303 | ||
304 | /* Only send data header. */ | |
305 | ret = sock->ops->sendmsg(sock, hdr, size, 0); | |
306 | if (ret < 0) { | |
8994307f | 307 | ret = -errno; |
00e2e675 DG |
308 | goto error; |
309 | } | |
310 | ||
311 | /* | |
312 | * The data MUST be sent right after that command for the receive on the | |
313 | * other end to match the size in the header. | |
314 | */ | |
315 | ||
316 | error: | |
317 | return ret; | |
318 | } | |
173af62f DG |
319 | |
320 | /* | |
321 | * Send close stream command to the relayd. | |
322 | */ | |
323 | int relayd_send_close_stream(struct lttcomm_sock *sock, uint64_t stream_id, | |
324 | uint64_t last_net_seq_num) | |
325 | { | |
326 | int ret; | |
327 | struct lttcomm_relayd_close_stream msg; | |
328 | struct lttcomm_relayd_generic_reply reply; | |
329 | ||
330 | /* Code flow error. Safety net. */ | |
331 | assert(sock); | |
332 | ||
77c7c900 | 333 | DBG("Relayd closing stream id %" PRIu64, stream_id); |
173af62f DG |
334 | |
335 | msg.stream_id = htobe64(stream_id); | |
336 | msg.last_net_seq_num = htobe64(last_net_seq_num); | |
337 | ||
338 | /* Send command */ | |
339 | ret = send_command(sock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0); | |
340 | if (ret < 0) { | |
341 | goto error; | |
342 | } | |
343 | ||
344 | /* Recevie response */ | |
345 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
346 | if (ret < 0) { | |
347 | goto error; | |
348 | } | |
349 | ||
350 | reply.ret_code = be32toh(reply.ret_code); | |
351 | ||
352 | /* Return session id or negative ret code. */ | |
f73fabfd | 353 | if (reply.ret_code != LTTNG_OK) { |
173af62f DG |
354 | ret = -reply.ret_code; |
355 | ERR("Relayd close stream replied error %d", ret); | |
356 | } else { | |
357 | /* Success */ | |
358 | ret = 0; | |
359 | } | |
360 | ||
77c7c900 | 361 | DBG("Relayd close stream id %" PRIu64 " successfully", stream_id); |
173af62f DG |
362 | |
363 | error: | |
364 | return ret; | |
365 | } | |
c8f59ee5 DG |
366 | |
367 | /* | |
368 | * Check for data availability for a given stream id. | |
369 | * | |
6d805429 | 370 | * Return 0 if NOT pending, 1 if so and a negative value on error. |
c8f59ee5 | 371 | */ |
6d805429 | 372 | int relayd_data_pending(struct lttcomm_sock *sock, uint64_t stream_id, |
c8f59ee5 DG |
373 | uint64_t last_net_seq_num) |
374 | { | |
375 | int ret; | |
6d805429 | 376 | struct lttcomm_relayd_data_pending msg; |
c8f59ee5 DG |
377 | struct lttcomm_relayd_generic_reply reply; |
378 | ||
379 | /* Code flow error. Safety net. */ | |
380 | assert(sock); | |
381 | ||
6d805429 | 382 | DBG("Relayd data pending for stream id %" PRIu64, stream_id); |
c8f59ee5 DG |
383 | |
384 | msg.stream_id = htobe64(stream_id); | |
385 | msg.last_net_seq_num = htobe64(last_net_seq_num); | |
386 | ||
387 | /* Send command */ | |
6d805429 | 388 | ret = send_command(sock, RELAYD_DATA_PENDING, (void *) &msg, |
c8f59ee5 DG |
389 | sizeof(msg), 0); |
390 | if (ret < 0) { | |
391 | goto error; | |
392 | } | |
393 | ||
394 | /* Recevie response */ | |
395 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
396 | if (ret < 0) { | |
397 | goto error; | |
398 | } | |
399 | ||
400 | reply.ret_code = be32toh(reply.ret_code); | |
401 | ||
402 | /* Return session id or negative ret code. */ | |
403 | if (reply.ret_code >= LTTNG_OK) { | |
404 | ret = -reply.ret_code; | |
6d805429 | 405 | ERR("Relayd data pending replied error %d", ret); |
c8f59ee5 DG |
406 | } |
407 | ||
408 | /* At this point, the ret code is either 1 or 0 */ | |
409 | ret = reply.ret_code; | |
410 | ||
6d805429 DG |
411 | DBG("Relayd data is %s pending for stream id %" PRIu64, |
412 | ret == 1 ? "NOT" : "", stream_id); | |
c8f59ee5 DG |
413 | |
414 | error: | |
415 | return ret; | |
416 | } | |
417 | ||
418 | /* | |
419 | * Check on the relayd side for a quiescent state on the control socket. | |
420 | */ | |
421 | int relayd_quiescent_control(struct lttcomm_sock *sock) | |
422 | { | |
423 | int ret; | |
424 | struct lttcomm_relayd_generic_reply reply; | |
425 | ||
426 | /* Code flow error. Safety net. */ | |
427 | assert(sock); | |
428 | ||
429 | DBG("Relayd checking quiescent control state"); | |
430 | ||
431 | /* Send command */ | |
432 | ret = send_command(sock, RELAYD_QUIESCENT_CONTROL, NULL, 0, 0); | |
433 | if (ret < 0) { | |
434 | goto error; | |
435 | } | |
436 | ||
437 | /* Recevie response */ | |
438 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
439 | if (ret < 0) { | |
440 | goto error; | |
441 | } | |
442 | ||
443 | reply.ret_code = be32toh(reply.ret_code); | |
444 | ||
445 | /* Return session id or negative ret code. */ | |
446 | if (reply.ret_code != LTTNG_OK) { | |
447 | ret = -reply.ret_code; | |
448 | ERR("Relayd quiescent control replied error %d", ret); | |
449 | goto error; | |
450 | } | |
451 | ||
452 | /* Control socket is quiescent */ | |
6d805429 | 453 | return 0; |
c8f59ee5 DG |
454 | |
455 | error: | |
456 | return ret; | |
457 | } |