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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) { | |
70 | goto error; | |
71 | } | |
72 | ||
633d0084 | 73 | DBG3("Relayd sending command %d of size %" PRIu64, cmd, buf_size); |
00e2e675 DG |
74 | |
75 | error: | |
76 | free(buf); | |
77 | alloc_error: | |
78 | return ret; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Receive reply data on socket. This MUST be call after send_command or else | |
83 | * could result in unexpected behavior(s). | |
84 | */ | |
85 | static int recv_reply(struct lttcomm_sock *sock, void *data, size_t size) | |
86 | { | |
87 | int ret; | |
88 | ||
633d0084 | 89 | DBG3("Relayd waiting for reply of size %ld", size); |
00e2e675 DG |
90 | |
91 | ret = sock->ops->recvmsg(sock, data, size, 0); | |
92 | if (ret < 0) { | |
93 | goto error; | |
94 | } | |
95 | ||
96 | error: | |
97 | return ret; | |
98 | } | |
99 | ||
00e2e675 DG |
100 | /* |
101 | * Add stream on the relayd and assign stream handle to the stream_id argument. | |
102 | * | |
103 | * On success return 0 else return ret_code negative value. | |
104 | */ | |
105 | int relayd_add_stream(struct lttcomm_sock *sock, const char *channel_name, | |
106 | const char *pathname, uint64_t *stream_id) | |
107 | { | |
108 | int ret; | |
109 | struct lttcomm_relayd_add_stream msg; | |
110 | struct lttcomm_relayd_status_stream reply; | |
111 | ||
112 | /* Code flow error. Safety net. */ | |
113 | assert(sock); | |
114 | assert(channel_name); | |
115 | assert(pathname); | |
116 | ||
117 | DBG("Relayd adding stream for channel name %s", channel_name); | |
118 | ||
119 | strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name)); | |
120 | strncpy(msg.pathname, pathname, sizeof(msg.pathname)); | |
121 | ||
122 | /* Send command */ | |
123 | ret = send_command(sock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0); | |
124 | if (ret < 0) { | |
125 | goto error; | |
126 | } | |
127 | ||
633d0084 | 128 | /* Waiting for reply */ |
00e2e675 DG |
129 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); |
130 | if (ret < 0) { | |
131 | goto error; | |
132 | } | |
133 | ||
134 | /* Back to host bytes order. */ | |
135 | reply.handle = be64toh(reply.handle); | |
136 | reply.ret_code = be32toh(reply.ret_code); | |
137 | ||
138 | /* Return session id or negative ret code. */ | |
f73fabfd | 139 | if (reply.ret_code != LTTNG_OK) { |
00e2e675 DG |
140 | ret = -reply.ret_code; |
141 | ERR("Relayd add stream replied error %d", ret); | |
142 | } else { | |
143 | /* Success */ | |
144 | ret = 0; | |
145 | *stream_id = reply.handle; | |
146 | } | |
147 | ||
77c7c900 MD |
148 | DBG("Relayd stream added successfully with handle %" PRIu64, |
149 | reply.handle); | |
00e2e675 DG |
150 | |
151 | error: | |
152 | return ret; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Check version numbers on the relayd. | |
157 | * | |
158 | * Return 0 if compatible else negative value. | |
159 | */ | |
160 | int relayd_version_check(struct lttcomm_sock *sock, uint32_t major, | |
161 | uint32_t minor) | |
162 | { | |
163 | int ret; | |
164 | struct lttcomm_relayd_version reply; | |
165 | ||
166 | /* Code flow error. Safety net. */ | |
167 | assert(sock); | |
168 | ||
169 | DBG("Relayd version check for major.minor %u.%u", major, minor); | |
170 | ||
171 | /* Send command */ | |
172 | ret = send_command(sock, RELAYD_VERSION, NULL, 0, 0); | |
173 | if (ret < 0) { | |
174 | goto error; | |
175 | } | |
176 | ||
177 | /* Recevie response */ | |
178 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
179 | if (ret < 0) { | |
180 | goto error; | |
181 | } | |
182 | ||
183 | /* Set back to host bytes order */ | |
184 | reply.major = be32toh(reply.major); | |
185 | reply.minor = be32toh(reply.minor); | |
186 | ||
187 | /* Validate version */ | |
188 | if (reply.major <= major) { | |
189 | if (reply.minor <= minor) { | |
190 | /* Compatible */ | |
191 | ret = 0; | |
192 | DBG2("Relayd version is compatible"); | |
193 | goto error; | |
194 | } | |
195 | } | |
196 | ||
197 | /* Version number not compatible */ | |
198 | DBG2("Relayd version is NOT compatible %u.%u > %u.%u", reply.major, | |
199 | reply.minor, major, minor); | |
200 | ret = -1; | |
201 | ||
202 | error: | |
203 | return ret; | |
204 | } | |
205 | ||
00e2e675 DG |
206 | /* |
207 | * Add stream on the relayd and assign stream handle to the stream_id argument. | |
208 | * | |
209 | * On success return 0 else return ret_code negative value. | |
210 | */ | |
211 | int relayd_send_metadata(struct lttcomm_sock *sock, size_t len) | |
212 | { | |
213 | int ret; | |
214 | ||
215 | /* Code flow error. Safety net. */ | |
216 | assert(sock); | |
217 | ||
77c7c900 | 218 | DBG("Relayd sending metadata of size %zu", len); |
00e2e675 DG |
219 | |
220 | /* Send command */ | |
221 | ret = send_command(sock, RELAYD_SEND_METADATA, NULL, len, 0); | |
222 | if (ret < 0) { | |
223 | goto error; | |
224 | } | |
225 | ||
226 | DBG2("Relayd metadata added successfully"); | |
227 | ||
228 | /* | |
229 | * After that call, the metadata data MUST be sent to the relayd so the | |
230 | * receive size on the other end matches the len of the metadata packet | |
633d0084 | 231 | * header. This is why we don't wait for a reply here. |
00e2e675 DG |
232 | */ |
233 | ||
234 | error: | |
235 | return ret; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Connect to relay daemon with an allocated lttcomm_sock. | |
240 | */ | |
241 | int relayd_connect(struct lttcomm_sock *sock) | |
242 | { | |
243 | /* Code flow error. Safety net. */ | |
244 | assert(sock); | |
245 | ||
246 | DBG3("Relayd connect ..."); | |
247 | ||
248 | return sock->ops->connect(sock); | |
249 | } | |
250 | ||
251 | /* | |
252 | * Close relayd socket with an allocated lttcomm_sock. | |
253 | */ | |
254 | int relayd_close(struct lttcomm_sock *sock) | |
255 | { | |
256 | /* Code flow error. Safety net. */ | |
257 | assert(sock); | |
258 | ||
259 | DBG3("Relayd closing socket %d", sock->fd); | |
260 | ||
261 | return sock->ops->close(sock); | |
262 | } | |
263 | ||
264 | /* | |
265 | * Send data header structure to the relayd. | |
266 | */ | |
267 | int relayd_send_data_hdr(struct lttcomm_sock *sock, | |
268 | struct lttcomm_relayd_data_hdr *hdr, size_t size) | |
269 | { | |
270 | int ret; | |
271 | ||
272 | /* Code flow error. Safety net. */ | |
273 | assert(sock); | |
274 | assert(hdr); | |
275 | ||
633d0084 | 276 | DBG3("Relayd sending data header of size %ld", size); |
00e2e675 DG |
277 | |
278 | /* Again, safety net */ | |
279 | if (size == 0) { | |
280 | size = sizeof(struct lttcomm_relayd_data_hdr); | |
281 | } | |
282 | ||
283 | /* Only send data header. */ | |
284 | ret = sock->ops->sendmsg(sock, hdr, size, 0); | |
285 | if (ret < 0) { | |
286 | goto error; | |
287 | } | |
288 | ||
289 | /* | |
290 | * The data MUST be sent right after that command for the receive on the | |
291 | * other end to match the size in the header. | |
292 | */ | |
293 | ||
294 | error: | |
295 | return ret; | |
296 | } | |
173af62f DG |
297 | |
298 | /* | |
299 | * Send close stream command to the relayd. | |
300 | */ | |
301 | int relayd_send_close_stream(struct lttcomm_sock *sock, uint64_t stream_id, | |
302 | uint64_t last_net_seq_num) | |
303 | { | |
304 | int ret; | |
305 | struct lttcomm_relayd_close_stream msg; | |
306 | struct lttcomm_relayd_generic_reply reply; | |
307 | ||
308 | /* Code flow error. Safety net. */ | |
309 | assert(sock); | |
310 | ||
77c7c900 | 311 | DBG("Relayd closing stream id %" PRIu64, stream_id); |
173af62f DG |
312 | |
313 | msg.stream_id = htobe64(stream_id); | |
314 | msg.last_net_seq_num = htobe64(last_net_seq_num); | |
315 | ||
316 | /* Send command */ | |
317 | ret = send_command(sock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0); | |
318 | if (ret < 0) { | |
319 | goto error; | |
320 | } | |
321 | ||
322 | /* Recevie response */ | |
323 | ret = recv_reply(sock, (void *) &reply, sizeof(reply)); | |
324 | if (ret < 0) { | |
325 | goto error; | |
326 | } | |
327 | ||
328 | reply.ret_code = be32toh(reply.ret_code); | |
329 | ||
330 | /* Return session id or negative ret code. */ | |
f73fabfd | 331 | if (reply.ret_code != LTTNG_OK) { |
173af62f DG |
332 | ret = -reply.ret_code; |
333 | ERR("Relayd close stream replied error %d", ret); | |
334 | } else { | |
335 | /* Success */ | |
336 | ret = 0; | |
337 | } | |
338 | ||
77c7c900 | 339 | DBG("Relayd close stream id %" PRIu64 " successfully", stream_id); |
173af62f DG |
340 | |
341 | error: | |
342 | return ret; | |
343 | } |