Commit | Line | Data |
---|---|---|
826d496d | 1 | /* |
917216f6 DG |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
fac6795d | 8 | * |
917216f6 DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
fac6795d | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
1e307fab | 20 | #include <assert.h> |
fac6795d DG |
21 | #include <limits.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
fac6795d DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
fac6795d | 27 | #include <unistd.h> |
3bd1e081 | 28 | #include <errno.h> |
fac6795d | 29 | |
990570ed | 30 | #include <common/defaults.h> |
4c462e79 | 31 | #include <common/error.h> |
990570ed | 32 | |
10a8a223 | 33 | #include "sessiond-comm.h" |
fac6795d DG |
34 | |
35 | /* | |
36 | * Human readable error message. | |
37 | */ | |
38 | static const char *lttcomm_readable_code[] = { | |
39 | [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success", | |
40 | [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error", | |
41 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command", | |
7d29a247 DG |
42 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented", |
43 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain", | |
fac6795d DG |
44 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found", |
45 | [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps", | |
e065084a | 46 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found", |
f3ed775e | 47 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found", |
ce3d728c | 48 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found", |
ca95a216 | 49 | [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon", |
ae856491 | 50 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_DIR_FAIL) ] = "Create directory failed", |
379473d2 | 51 | [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed", |
520ff687 | 52 | [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed", |
379473d2 DG |
53 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable", |
54 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected", | |
27673bb6 | 55 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist", |
d9800920 | 56 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket", |
2b0bf864 | 57 | [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found", |
8e0af1b4 | 58 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EPERM) ] = "Permission denied", |
20fe2104 | 59 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available", |
394016d1 | 60 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible", |
7d29a247 | 61 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists", |
20fe2104 | 62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed", |
42224349 | 63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_EXIST) ] = "Kernel channel already exists", |
20fe2104 | 64 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed", |
f3ed775e | 65 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found", |
26cc6b4e | 66 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed", |
d36b8583 | 67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed", |
d65106b1 | 68 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed", |
f34daff7 DG |
69 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed", |
70 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed", | |
aaf26714 | 71 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed", |
8c0faa1d DG |
72 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed", |
73 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed", | |
74 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed", | |
75 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed", | |
76 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed", | |
77 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist", | |
84291629 | 78 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found", |
2ef84c95 | 79 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed", |
4466912f | 80 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CALIBRATE_FAIL) ] = "UST calibration failed", |
e0c7ec2b | 81 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_VERSION) ] = "UST tracer version is not compatible", |
0177d773 | 82 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed", |
2b0bf864 | 83 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed", |
f6a9efaa | 84 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist", |
2bdd86d4 MD |
85 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found", |
86 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed", | |
87 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed", | |
88 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed", | |
89 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed", | |
90 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed", | |
91 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed", | |
92 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed", | |
93 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed", | |
7753dea8 MD |
94 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed", |
95 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed", | |
2bdd86d4 MD |
96 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed", |
97 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed", | |
98 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist", | |
99 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found", | |
100 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed", | |
3b25d04d | 101 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist", |
be4f0921 | 102 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found", |
ae357384 | 103 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist", |
ae856491 | 104 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context", |
30905cf4 | 105 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NEED_ROOT_SESSIOND) ] = "Tracing the kernel requires a root lttng-sessiond daemon and \"tracing\" group user membership", |
80e327fa DG |
106 | [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STARTED) ] = "Tracing already started", |
107 | [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STOPPED) ] = "Tracing already stopped", | |
bd29c13d | 108 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_ENOSYS) ] = "Kernel event type not supported", |
80e327fa | 109 | |
3bd1e081 MD |
110 | [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready", |
111 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds", | |
112 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds", | |
f2fc6720 | 113 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command", |
3bd1e081 MD |
114 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread", |
115 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd", | |
116 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up", | |
117 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally", | |
118 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error", | |
119 | [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile", | |
120 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF", | |
121 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL", | |
122 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM", | |
123 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE", | |
d65106b1 | 124 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found", |
b024d072 | 125 | [ LTTCOMM_ERR_INDEX(LTTCOMM_INVALID) ] = "Invalid parameter", |
fac6795d DG |
126 | }; |
127 | ||
128 | /* | |
917216f6 DG |
129 | * Return ptr to string representing a human readable error code from the |
130 | * lttcomm_return_code enum. | |
fac6795d | 131 | * |
917216f6 | 132 | * These code MUST be negative in other to treat that as an error value. |
fac6795d DG |
133 | */ |
134 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
135 | { | |
136 | int tmp_code = -code; | |
137 | ||
138 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
139 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
140 | } | |
141 | ||
142 | return "Unknown error code"; | |
143 | } | |
144 | ||
145 | /* | |
917216f6 | 146 | * Connect to unix socket using the path name. |
fac6795d DG |
147 | */ |
148 | int lttcomm_connect_unix_sock(const char *pathname) | |
149 | { | |
686204ab | 150 | struct sockaddr_un sun; |
4c462e79 | 151 | int fd, ret, closeret; |
fac6795d | 152 | |
686204ab | 153 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d | 154 | if (fd < 0) { |
4c462e79 | 155 | PERROR("socket"); |
a8afeb4a | 156 | ret = fd; |
fac6795d DG |
157 | goto error; |
158 | } | |
159 | ||
686204ab MD |
160 | memset(&sun, 0, sizeof(sun)); |
161 | sun.sun_family = AF_UNIX; | |
162 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
99497cd0 | 163 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; |
fac6795d | 164 | |
686204ab MD |
165 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
166 | if (ret < 0) { | |
a8afeb4a | 167 | /* |
917216f6 DG |
168 | * Don't print message on connect error, because connect is used in |
169 | * normal execution to detect if sessiond is alive. | |
a8afeb4a MD |
170 | */ |
171 | goto error_connect; | |
686204ab | 172 | } |
fac6795d | 173 | |
686204ab | 174 | return fd; |
fac6795d | 175 | |
a8afeb4a | 176 | error_connect: |
4c462e79 MD |
177 | closeret = close(fd); |
178 | if (closeret) { | |
179 | PERROR("close"); | |
180 | } | |
fac6795d | 181 | error: |
a8afeb4a | 182 | return ret; |
fac6795d DG |
183 | } |
184 | ||
185 | /* | |
917216f6 DG |
186 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
187 | * MUST be bind(2) before. | |
fac6795d DG |
188 | */ |
189 | int lttcomm_accept_unix_sock(int sock) | |
190 | { | |
191 | int new_fd; | |
192 | struct sockaddr_un sun; | |
193 | socklen_t len = 0; | |
194 | ||
195 | /* Blocking call */ | |
196 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
197 | if (new_fd < 0) { | |
4c462e79 | 198 | PERROR("accept"); |
fac6795d DG |
199 | } |
200 | ||
201 | return new_fd; | |
fac6795d DG |
202 | } |
203 | ||
204 | /* | |
917216f6 DG |
205 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
206 | * and return the fd. | |
fac6795d DG |
207 | */ |
208 | int lttcomm_create_unix_sock(const char *pathname) | |
209 | { | |
210 | struct sockaddr_un sun; | |
211 | int fd; | |
212 | int ret = -1; | |
213 | ||
214 | /* Create server socket */ | |
215 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
4c462e79 | 216 | PERROR("socket"); |
fac6795d DG |
217 | goto error; |
218 | } | |
219 | ||
220 | memset(&sun, 0, sizeof(sun)); | |
221 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
222 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
223 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 224 | |
7d8234d9 MD |
225 | /* Unlink the old file if present */ |
226 | (void) unlink(pathname); | |
fac6795d DG |
227 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
228 | if (ret < 0) { | |
4c462e79 | 229 | PERROR("bind"); |
fac6795d DG |
230 | goto error; |
231 | } | |
232 | ||
233 | return fd; | |
234 | ||
235 | error: | |
236 | return ret; | |
237 | } | |
238 | ||
239 | /* | |
f158a754 | 240 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
241 | */ |
242 | int lttcomm_listen_unix_sock(int sock) | |
243 | { | |
244 | int ret; | |
245 | ||
f158a754 | 246 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d | 247 | if (ret < 0) { |
4c462e79 | 248 | PERROR("listen"); |
fac6795d DG |
249 | } |
250 | ||
251 | return ret; | |
252 | } | |
253 | ||
254 | /* | |
917216f6 DG |
255 | * Receive data of size len in put that data into the buf param. Using recvmsg |
256 | * API. | |
fac6795d | 257 | * |
917216f6 | 258 | * Return the size of received data. |
fac6795d DG |
259 | */ |
260 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
261 | { | |
156ea65a | 262 | struct msghdr msg; |
fac6795d DG |
263 | struct iovec iov[1]; |
264 | ssize_t ret = -1; | |
265 | ||
156ea65a MD |
266 | memset(&msg, 0, sizeof(msg)); |
267 | ||
fac6795d DG |
268 | iov[0].iov_base = buf; |
269 | iov[0].iov_len = len; | |
270 | msg.msg_iov = iov; | |
271 | msg.msg_iovlen = 1; | |
272 | ||
91fe73e2 MD |
273 | do { |
274 | ret = recvmsg(sock, &msg, MSG_WAITALL); | |
275 | } while (ret < 0 && errno == EINTR); | |
fac6795d | 276 | if (ret < 0) { |
4c462e79 | 277 | PERROR("recvmsg"); |
fac6795d DG |
278 | } |
279 | ||
280 | return ret; | |
281 | } | |
282 | ||
283 | /* | |
917216f6 | 284 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 285 | * |
917216f6 | 286 | * Return the size of sent data. |
fac6795d DG |
287 | */ |
288 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
289 | { | |
156ea65a | 290 | struct msghdr msg; |
fac6795d DG |
291 | struct iovec iov[1]; |
292 | ssize_t ret = -1; | |
293 | ||
156ea65a MD |
294 | memset(&msg, 0, sizeof(msg)); |
295 | ||
fac6795d DG |
296 | iov[0].iov_base = buf; |
297 | iov[0].iov_len = len; | |
298 | msg.msg_iov = iov; | |
299 | msg.msg_iovlen = 1; | |
300 | ||
301 | ret = sendmsg(sock, &msg, 0); | |
302 | if (ret < 0) { | |
d2641a83 MD |
303 | /* |
304 | * Only warn about EPIPE when quiet mode is deactivated. | |
305 | * We consider EPIPE as expected. | |
306 | */ | |
97e19046 | 307 | if (errno != EPIPE || !lttng_opt_quiet) { |
d2641a83 MD |
308 | PERROR("sendmsg"); |
309 | } | |
fac6795d DG |
310 | } |
311 | ||
312 | return ret; | |
313 | } | |
87378cf5 DG |
314 | |
315 | /* | |
917216f6 | 316 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
317 | */ |
318 | int lttcomm_close_unix_sock(int sock) | |
319 | { | |
4c462e79 | 320 | int ret, closeret; |
87378cf5 DG |
321 | |
322 | /* Shutdown receptions and transmissions */ | |
323 | ret = shutdown(sock, SHUT_RDWR); | |
324 | if (ret < 0) { | |
4c462e79 | 325 | PERROR("shutdown"); |
87378cf5 DG |
326 | } |
327 | ||
4c462e79 MD |
328 | closeret = close(sock); |
329 | if (closeret) { | |
330 | PERROR("close"); | |
331 | } | |
b0ef677e | 332 | |
87378cf5 DG |
333 | return ret; |
334 | } | |
8c0faa1d DG |
335 | |
336 | /* | |
3bd1e081 MD |
337 | * Send a message accompanied by fd(s) over a unix socket. |
338 | * | |
339 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 340 | */ |
3bd1e081 | 341 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 342 | { |
156ea65a | 343 | struct msghdr msg; |
8c0faa1d DG |
344 | struct cmsghdr *cmptr; |
345 | struct iovec iov[1]; | |
346 | ssize_t ret = -1; | |
347 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
348 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 349 | char dummy = 0; |
8c0faa1d | 350 | |
156ea65a MD |
351 | memset(&msg, 0, sizeof(msg)); |
352 | ||
3bd1e081 MD |
353 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
354 | return -EINVAL; | |
8c0faa1d DG |
355 | |
356 | msg.msg_control = (caddr_t)tmp; | |
357 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
358 | ||
359 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
360 | cmptr->cmsg_level = SOL_SOCKET; |
361 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 362 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 363 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
364 | /* Sum of the length of all control messages in the buffer: */ |
365 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 366 | |
3bd1e081 MD |
367 | iov[0].iov_base = &dummy; |
368 | iov[0].iov_len = 1; | |
8c0faa1d DG |
369 | msg.msg_iov = iov; |
370 | msg.msg_iovlen = 1; | |
371 | ||
66724ea3 DG |
372 | do { |
373 | ret = sendmsg(sock, &msg, 0); | |
374 | } while (ret < 0 && errno == EINTR); | |
8c0faa1d | 375 | if (ret < 0) { |
d2641a83 MD |
376 | /* |
377 | * Only warn about EPIPE when quiet mode is deactivated. | |
378 | * We consider EPIPE as expected. | |
379 | */ | |
97e19046 | 380 | if (errno != EPIPE || !lttng_opt_quiet) { |
d2641a83 MD |
381 | PERROR("sendmsg"); |
382 | } | |
8c0faa1d | 383 | } |
8c0faa1d DG |
384 | return ret; |
385 | } | |
09de5c68 DG |
386 | |
387 | /* | |
3bd1e081 | 388 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 389 | * |
3bd1e081 MD |
390 | * Returns the size of received data, or negative error value. |
391 | * | |
392 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
393 | * actually received in nb_fd. | |
09de5c68 | 394 | */ |
3bd1e081 | 395 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
396 | { |
397 | struct iovec iov[1]; | |
3bd1e081 | 398 | ssize_t ret = 0; |
09de5c68 | 399 | struct cmsghdr *cmsg; |
3bd1e081 MD |
400 | size_t sizeof_fds = nb_fd * sizeof(int); |
401 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
156ea65a | 402 | struct msghdr msg; |
3bd1e081 | 403 | char dummy; |
09de5c68 | 404 | |
156ea65a MD |
405 | memset(&msg, 0, sizeof(msg)); |
406 | ||
09de5c68 | 407 | /* Prepare to receive the structures */ |
3bd1e081 MD |
408 | iov[0].iov_base = &dummy; |
409 | iov[0].iov_len = 1; | |
09de5c68 DG |
410 | msg.msg_iov = iov; |
411 | msg.msg_iovlen = 1; | |
412 | msg.msg_control = recv_fd; | |
413 | msg.msg_controllen = sizeof(recv_fd); | |
414 | ||
91fe73e2 MD |
415 | do { |
416 | ret = recvmsg(sock, &msg, 0); | |
417 | } while (ret < 0 && errno == EINTR); | |
09de5c68 | 418 | if (ret < 0) { |
4c462e79 | 419 | PERROR("recvmsg fds"); |
09de5c68 DG |
420 | goto end; |
421 | } | |
3bd1e081 MD |
422 | if (ret != 1) { |
423 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
424 | ret, 1); | |
425 | goto end; | |
426 | } | |
427 | if (msg.msg_flags & MSG_CTRUNC) { | |
428 | fprintf(stderr, "Error: Control message truncated.\n"); | |
429 | ret = -1; | |
09de5c68 DG |
430 | goto end; |
431 | } | |
09de5c68 DG |
432 | cmsg = CMSG_FIRSTHDR(&msg); |
433 | if (!cmsg) { | |
3bd1e081 | 434 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
435 | ret = -1; |
436 | goto end; | |
437 | } | |
09de5c68 | 438 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 439 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
440 | ret = -1; |
441 | goto end; | |
442 | } | |
3bd1e081 MD |
443 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
444 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 445 | (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); |
3bd1e081 MD |
446 | ret = -1; |
447 | goto end; | |
09de5c68 | 448 | } |
3bd1e081 MD |
449 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
450 | ret = sizeof_fds; | |
09de5c68 DG |
451 | end: |
452 | return ret; | |
453 | } | |
d19d9ada DG |
454 | |
455 | /* | |
456 | * Send a message with credentials over a unix socket. | |
457 | * | |
458 | * Returns the size of data sent, or negative error value. | |
459 | */ | |
460 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) | |
461 | { | |
156ea65a | 462 | struct msghdr msg; |
d19d9ada DG |
463 | struct iovec iov[1]; |
464 | ssize_t ret = -1; | |
d27c42b8 MD |
465 | #ifdef __linux__ |
466 | struct cmsghdr *cmptr; | |
b17231c6 | 467 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 468 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
b17231c6 | 469 | lttng_sock_cred *creds; |
d27c42b8 | 470 | #endif /* __linux__ */ |
d19d9ada | 471 | |
156ea65a MD |
472 | memset(&msg, 0, sizeof(msg)); |
473 | ||
d19d9ada DG |
474 | iov[0].iov_base = buf; |
475 | iov[0].iov_len = len; | |
476 | msg.msg_iov = iov; | |
477 | msg.msg_iovlen = 1; | |
478 | ||
d27c42b8 | 479 | #ifdef __linux__ |
d19d9ada DG |
480 | msg.msg_control = (caddr_t) anc_buf; |
481 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
482 | ||
483 | cmptr = CMSG_FIRSTHDR(&msg); | |
484 | cmptr->cmsg_level = SOL_SOCKET; | |
b17231c6 | 485 | cmptr->cmsg_type = LTTNG_SOCK_CREDS; |
d19d9ada DG |
486 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); |
487 | ||
b17231c6 | 488 | creds = (lttng_sock_cred*) CMSG_DATA(cmptr); |
d19d9ada | 489 | |
b17231c6 DG |
490 | LTTNG_SOCK_SET_UID_CRED(creds, geteuid()); |
491 | LTTNG_SOCK_SET_GID_CRED(creds, getegid()); | |
492 | LTTNG_SOCK_SET_PID_CRED(creds, getpid()); | |
d27c42b8 | 493 | #endif /* __linux__ */ |
d19d9ada | 494 | |
66724ea3 DG |
495 | do { |
496 | ret = sendmsg(sock, &msg, 0); | |
497 | } while (ret < 0 && errno == EINTR); | |
d19d9ada | 498 | if (ret < 0) { |
d2641a83 MD |
499 | /* |
500 | * Only warn about EPIPE when quiet mode is deactivated. | |
501 | * We consider EPIPE as expected. | |
502 | */ | |
97e19046 | 503 | if (errno != EPIPE || !lttng_opt_quiet) { |
d2641a83 MD |
504 | PERROR("sendmsg"); |
505 | } | |
d19d9ada | 506 | } |
d19d9ada DG |
507 | return ret; |
508 | } | |
509 | ||
510 | /* | |
511 | * Recv a message accompanied with credentials from a unix socket. | |
512 | * | |
513 | * Returns the size of received data, or negative error value. | |
514 | */ | |
515 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
b17231c6 | 516 | lttng_sock_cred *creds) |
d19d9ada | 517 | { |
156ea65a | 518 | struct msghdr msg; |
d19d9ada DG |
519 | struct iovec iov[1]; |
520 | ssize_t ret; | |
d27c42b8 MD |
521 | #ifdef __linux__ |
522 | struct cmsghdr *cmptr; | |
b17231c6 | 523 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 524 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
d27c42b8 | 525 | #endif /* __linux__ */ |
d19d9ada | 526 | |
156ea65a MD |
527 | memset(&msg, 0, sizeof(msg)); |
528 | ||
d19d9ada DG |
529 | /* Not allowed */ |
530 | if (creds == NULL) { | |
531 | ret = -1; | |
532 | goto end; | |
533 | } | |
534 | ||
535 | /* Prepare to receive the structures */ | |
536 | iov[0].iov_base = buf; | |
537 | iov[0].iov_len = len; | |
538 | msg.msg_iov = iov; | |
539 | msg.msg_iovlen = 1; | |
540 | ||
d27c42b8 | 541 | #ifdef __linux__ |
d19d9ada DG |
542 | msg.msg_control = anc_buf; |
543 | msg.msg_controllen = sizeof(anc_buf); | |
d27c42b8 | 544 | #endif /* __linux__ */ |
d19d9ada | 545 | |
91fe73e2 MD |
546 | do { |
547 | ret = recvmsg(sock, &msg, 0); | |
548 | } while (ret < 0 && errno == EINTR); | |
d19d9ada | 549 | if (ret < 0) { |
4c462e79 | 550 | PERROR("recvmsg fds"); |
d19d9ada DG |
551 | goto end; |
552 | } | |
553 | ||
d27c42b8 | 554 | #ifdef __linux__ |
d19d9ada DG |
555 | if (msg.msg_flags & MSG_CTRUNC) { |
556 | fprintf(stderr, "Error: Control message truncated.\n"); | |
557 | ret = -1; | |
558 | goto end; | |
559 | } | |
560 | ||
561 | cmptr = CMSG_FIRSTHDR(&msg); | |
562 | if (cmptr == NULL) { | |
563 | fprintf(stderr, "Error: Invalid control message header\n"); | |
564 | ret = -1; | |
565 | goto end; | |
566 | } | |
567 | ||
568 | if (cmptr->cmsg_level != SOL_SOCKET || | |
b17231c6 | 569 | cmptr->cmsg_type != LTTNG_SOCK_CREDS) { |
d19d9ada DG |
570 | fprintf(stderr, "Didn't received any credentials\n"); |
571 | ret = -1; | |
572 | goto end; | |
573 | } | |
574 | ||
575 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
576 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 577 | (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred)); |
d19d9ada DG |
578 | ret = -1; |
579 | goto end; | |
580 | } | |
581 | ||
582 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
d27c42b8 | 583 | #elif defined(__FreeBSD__) |
9e89c931 MD |
584 | { |
585 | int peer_ret; | |
586 | ||
587 | peer_ret = getpeereid(sock, &creds->uid, &creds->gid); | |
588 | if (peer_ret != 0) { | |
589 | return peer_ret; | |
590 | } | |
67cf0ab7 | 591 | } |
d27c42b8 MD |
592 | #else |
593 | #error "Please implement credential support for your OS." | |
594 | #endif /* __linux__ */ | |
d19d9ada DG |
595 | |
596 | end: | |
597 | return ret; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Set socket option to use credentials passing. | |
602 | */ | |
d27c42b8 | 603 | #ifdef __linux__ |
d19d9ada DG |
604 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
605 | { | |
606 | int ret, on = 1; | |
607 | ||
608 | /* Set socket for credentials retrieval */ | |
609 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
610 | if (ret < 0) { | |
4c462e79 | 611 | PERROR("setsockopt creds unix sock"); |
d19d9ada | 612 | } |
d19d9ada DG |
613 | return ret; |
614 | } | |
d27c42b8 MD |
615 | #elif defined(__FreeBSD__) |
616 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
617 | { | |
618 | return 0; | |
619 | } | |
620 | #else | |
621 | #error "Please implement credential support for your OS." | |
622 | #endif /* __linux__ */ |