Commit | Line | Data |
---|---|---|
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; | |
166 | struct lttcomm_relayd_version reply; | |
167 | ||
168 | /* Code flow error. Safety net. */ | |
169 | assert(sock); | |
170 | ||
171 | DBG("Relayd version check for major.minor %u.%u", major, minor); | |
172 | ||
173 | /* Send command */ | |
174 | ret = send_command(sock, RELAYD_VERSION, NULL, 0, 0); | |
175 | if (ret < 0) { | |
176 | goto error; | |
177 | } | |
178 | ||
179 | /* Recevie response */ | |
180 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
181 | if (ret < 0) { | |
182 | goto error; | |
183 | } | |
184 | ||
185 | /* Set back to host bytes order */ | |
186 | reply.major = be32toh(reply.major); | |
187 | reply.minor = be32toh(reply.minor); | |
188 | ||
189 | /* Validate version */ | |
190 | if (reply.major <= major) { | |
191 | if (reply.minor <= minor) { | |
192 | /* Compatible */ | |
193 | ret = 0; | |
194 | DBG2("Relayd version is compatible"); | |
195 | goto error; | |
196 | } | |
197 | } | |
198 | ||
199 | /* Version number not compatible */ | |
200 | DBG2("Relayd version is NOT compatible %u.%u > %u.%u", reply.major, | |
201 | reply.minor, major, minor); | |
202 | ret = -1; | |
203 | ||
204 | error: | |
205 | return ret; | |
206 | } | |
207 | ||
00e2e675 DG |
208 | /* |
209 | * Add stream on the relayd and assign stream handle to the stream_id argument. | |
210 | * | |
211 | * On success return 0 else return ret_code negative value. | |
212 | */ | |
213 | int relayd_send_metadata(struct lttcomm_sock *sock, size_t len) | |
214 | { | |
215 | int ret; | |
216 | ||
217 | /* Code flow error. Safety net. */ | |
218 | assert(sock); | |
219 | ||
77c7c900 | 220 | DBG("Relayd sending metadata of size %zu", len); |
00e2e675 DG |
221 | |
222 | /* Send command */ | |
223 | ret = send_command(sock, RELAYD_SEND_METADATA, NULL, len, 0); | |
224 | if (ret < 0) { | |
225 | goto error; | |
226 | } | |
227 | ||
228 | DBG2("Relayd metadata added successfully"); | |
229 | ||
230 | /* | |
231 | * After that call, the metadata data MUST be sent to the relayd so the | |
232 | * receive size on the other end matches the len of the metadata packet | |
633d0084 | 233 | * header. This is why we don't wait for a reply here. |
00e2e675 DG |
234 | */ |
235 | ||
236 | error: | |
237 | return ret; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Connect to relay daemon with an allocated lttcomm_sock. | |
242 | */ | |
243 | int relayd_connect(struct lttcomm_sock *sock) | |
244 | { | |
245 | /* Code flow error. Safety net. */ | |
246 | assert(sock); | |
247 | ||
248 | DBG3("Relayd connect ..."); | |
249 | ||
250 | return sock->ops->connect(sock); | |
251 | } | |
252 | ||
253 | /* | |
254 | * Close relayd socket with an allocated lttcomm_sock. | |
255 | */ | |
256 | int relayd_close(struct lttcomm_sock *sock) | |
257 | { | |
258 | /* Code flow error. Safety net. */ | |
259 | assert(sock); | |
260 | ||
261 | DBG3("Relayd closing socket %d", sock->fd); | |
262 | ||
263 | return sock->ops->close(sock); | |
264 | } | |
265 | ||
266 | /* | |
267 | * Send data header structure to the relayd. | |
268 | */ | |
269 | int relayd_send_data_hdr(struct lttcomm_sock *sock, | |
270 | struct lttcomm_relayd_data_hdr *hdr, size_t size) | |
271 | { | |
272 | int ret; | |
273 | ||
274 | /* Code flow error. Safety net. */ | |
275 | assert(sock); | |
276 | assert(hdr); | |
277 | ||
633d0084 | 278 | DBG3("Relayd sending data header of size %ld", size); |
00e2e675 DG |
279 | |
280 | /* Again, safety net */ | |
281 | if (size == 0) { | |
282 | size = sizeof(struct lttcomm_relayd_data_hdr); | |
283 | } | |
284 | ||
285 | /* Only send data header. */ | |
286 | ret = sock->ops->sendmsg(sock, hdr, size, 0); | |
287 | if (ret < 0) { | |
8994307f | 288 | ret = -errno; |
00e2e675 DG |
289 | goto error; |
290 | } | |
291 | ||
292 | /* | |
293 | * The data MUST be sent right after that command for the receive on the | |
294 | * other end to match the size in the header. | |
295 | */ | |
296 | ||
297 | error: | |
298 | return ret; | |
299 | } | |
173af62f DG |
300 | |
301 | /* | |
302 | * Send close stream command to the relayd. | |
303 | */ | |
304 | int relayd_send_close_stream(struct lttcomm_sock *sock, uint64_t stream_id, | |
305 | uint64_t last_net_seq_num) | |
306 | { | |
307 | int ret; | |
308 | struct lttcomm_relayd_close_stream msg; | |
309 | struct lttcomm_relayd_generic_reply reply; | |
310 | ||
311 | /* Code flow error. Safety net. */ | |
312 | assert(sock); | |
313 | ||
77c7c900 | 314 | DBG("Relayd closing stream id %" PRIu64, stream_id); |
173af62f DG |
315 | |
316 | msg.stream_id = htobe64(stream_id); | |
317 | msg.last_net_seq_num = htobe64(last_net_seq_num); | |
318 | ||
319 | /* Send command */ | |
320 | ret = send_command(sock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0); | |
321 | if (ret < 0) { | |
322 | goto error; | |
323 | } | |
324 | ||
325 | /* Recevie response */ | |
326 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
327 | if (ret < 0) { | |
328 | goto error; | |
329 | } | |
330 | ||
331 | reply.ret_code = be32toh(reply.ret_code); | |
332 | ||
333 | /* Return session id or negative ret code. */ | |
f73fabfd | 334 | if (reply.ret_code != LTTNG_OK) { |
173af62f DG |
335 | ret = -reply.ret_code; |
336 | ERR("Relayd close stream replied error %d", ret); | |
337 | } else { | |
338 | /* Success */ | |
339 | ret = 0; | |
340 | } | |
341 | ||
77c7c900 | 342 | DBG("Relayd close stream id %" PRIu64 " successfully", stream_id); |
173af62f DG |
343 | |
344 | error: | |
345 | return ret; | |
346 | } | |
c8f59ee5 DG |
347 | |
348 | /* | |
349 | * Check for data availability for a given stream id. | |
350 | * | |
6d805429 | 351 | * Return 0 if NOT pending, 1 if so and a negative value on error. |
c8f59ee5 | 352 | */ |
6d805429 | 353 | int relayd_data_pending(struct lttcomm_sock *sock, uint64_t stream_id, |
c8f59ee5 DG |
354 | uint64_t last_net_seq_num) |
355 | { | |
356 | int ret; | |
6d805429 | 357 | struct lttcomm_relayd_data_pending msg; |
c8f59ee5 DG |
358 | struct lttcomm_relayd_generic_reply reply; |
359 | ||
360 | /* Code flow error. Safety net. */ | |
361 | assert(sock); | |
362 | ||
6d805429 | 363 | DBG("Relayd data pending for stream id %" PRIu64, stream_id); |
c8f59ee5 DG |
364 | |
365 | msg.stream_id = htobe64(stream_id); | |
366 | msg.last_net_seq_num = htobe64(last_net_seq_num); | |
367 | ||
368 | /* Send command */ | |
6d805429 | 369 | ret = send_command(sock, RELAYD_DATA_PENDING, (void *) &msg, |
c8f59ee5 DG |
370 | sizeof(msg), 0); |
371 | if (ret < 0) { | |
372 | goto error; | |
373 | } | |
374 | ||
375 | /* Recevie response */ | |
376 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
377 | if (ret < 0) { | |
378 | goto error; | |
379 | } | |
380 | ||
381 | reply.ret_code = be32toh(reply.ret_code); | |
382 | ||
383 | /* Return session id or negative ret code. */ | |
384 | if (reply.ret_code >= LTTNG_OK) { | |
385 | ret = -reply.ret_code; | |
6d805429 | 386 | ERR("Relayd data pending replied error %d", ret); |
c8f59ee5 DG |
387 | } |
388 | ||
389 | /* At this point, the ret code is either 1 or 0 */ | |
390 | ret = reply.ret_code; | |
391 | ||
6d805429 DG |
392 | DBG("Relayd data is %s pending for stream id %" PRIu64, |
393 | ret == 1 ? "NOT" : "", stream_id); | |
c8f59ee5 DG |
394 | |
395 | error: | |
396 | return ret; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Check on the relayd side for a quiescent state on the control socket. | |
401 | */ | |
402 | int relayd_quiescent_control(struct lttcomm_sock *sock) | |
403 | { | |
404 | int ret; | |
405 | struct lttcomm_relayd_generic_reply reply; | |
406 | ||
407 | /* Code flow error. Safety net. */ | |
408 | assert(sock); | |
409 | ||
410 | DBG("Relayd checking quiescent control state"); | |
411 | ||
412 | /* Send command */ | |
413 | ret = send_command(sock, RELAYD_QUIESCENT_CONTROL, NULL, 0, 0); | |
414 | if (ret < 0) { | |
415 | goto error; | |
416 | } | |
417 | ||
418 | /* Recevie response */ | |
419 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
420 | if (ret < 0) { | |
421 | goto error; | |
422 | } | |
423 | ||
424 | reply.ret_code = be32toh(reply.ret_code); | |
425 | ||
426 | /* Return session id or negative ret code. */ | |
427 | if (reply.ret_code != LTTNG_OK) { | |
428 | ret = -reply.ret_code; | |
429 | ERR("Relayd quiescent control replied error %d", ret); | |
430 | goto error; | |
431 | } | |
432 | ||
433 | /* Control socket is quiescent */ | |
6d805429 | 434 | return 0; |
c8f59ee5 DG |
435 | |
436 | error: | |
437 | return ret; | |
438 | } |