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 | * |
917216f6 DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
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 | * |
917216f6 DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, 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 DG |
62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed", |
63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed", | |
f3ed775e | 64 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found", |
26cc6b4e | 65 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed", |
d36b8583 | 66 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed", |
d65106b1 | 67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed", |
f34daff7 DG |
68 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed", |
69 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed", | |
aaf26714 | 70 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed", |
8c0faa1d DG |
71 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed", |
72 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed", | |
73 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed", | |
74 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed", | |
75 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed", | |
76 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist", | |
84291629 | 77 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found", |
2ef84c95 | 78 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed", |
4466912f | 79 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CALIBRATE_FAIL) ] = "UST calibration failed", |
e0c7ec2b | 80 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_VERSION) ] = "UST tracer version is not compatible", |
0177d773 | 81 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed", |
2b0bf864 | 82 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed", |
f6a9efaa | 83 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist", |
2bdd86d4 MD |
84 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found", |
85 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed", | |
86 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed", | |
87 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed", | |
88 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed", | |
89 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed", | |
90 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed", | |
91 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed", | |
92 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed", | |
7753dea8 MD |
93 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed", |
94 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed", | |
2bdd86d4 MD |
95 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed", |
96 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed", | |
97 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist", | |
98 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found", | |
99 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed", | |
3b25d04d | 100 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist", |
be4f0921 | 101 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found", |
ae357384 | 102 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist", |
ae856491 | 103 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context", |
30905cf4 | 104 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NEED_ROOT_SESSIOND) ] = "Tracing the kernel requires a root lttng-sessiond daemon and \"tracing\" group user membership", |
80e327fa DG |
105 | [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STARTED) ] = "Tracing already started", |
106 | [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STOPPED) ] = "Tracing already stopped", | |
107 | ||
3bd1e081 MD |
108 | [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready", |
109 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds", | |
110 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds", | |
f2fc6720 | 111 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command", |
3bd1e081 MD |
112 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread", |
113 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd", | |
114 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up", | |
115 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally", | |
116 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error", | |
117 | [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile", | |
118 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF", | |
119 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL", | |
120 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM", | |
121 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE", | |
d65106b1 | 122 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found", |
fac6795d DG |
123 | }; |
124 | ||
125 | /* | |
917216f6 DG |
126 | * Return ptr to string representing a human readable error code from the |
127 | * lttcomm_return_code enum. | |
fac6795d | 128 | * |
917216f6 | 129 | * These code MUST be negative in other to treat that as an error value. |
fac6795d DG |
130 | */ |
131 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
132 | { | |
133 | int tmp_code = -code; | |
134 | ||
135 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
136 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
137 | } | |
138 | ||
139 | return "Unknown error code"; | |
140 | } | |
141 | ||
142 | /* | |
917216f6 | 143 | * Connect to unix socket using the path name. |
fac6795d DG |
144 | */ |
145 | int lttcomm_connect_unix_sock(const char *pathname) | |
146 | { | |
686204ab | 147 | struct sockaddr_un sun; |
4c462e79 | 148 | int fd, ret, closeret; |
fac6795d | 149 | |
686204ab | 150 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d | 151 | if (fd < 0) { |
4c462e79 | 152 | PERROR("socket"); |
a8afeb4a | 153 | ret = fd; |
fac6795d DG |
154 | goto error; |
155 | } | |
156 | ||
686204ab MD |
157 | memset(&sun, 0, sizeof(sun)); |
158 | sun.sun_family = AF_UNIX; | |
159 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
99497cd0 | 160 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; |
fac6795d | 161 | |
686204ab MD |
162 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
163 | if (ret < 0) { | |
a8afeb4a | 164 | /* |
917216f6 DG |
165 | * Don't print message on connect error, because connect is used in |
166 | * normal execution to detect if sessiond is alive. | |
a8afeb4a MD |
167 | */ |
168 | goto error_connect; | |
686204ab | 169 | } |
fac6795d | 170 | |
686204ab | 171 | return fd; |
fac6795d | 172 | |
a8afeb4a | 173 | error_connect: |
4c462e79 MD |
174 | closeret = close(fd); |
175 | if (closeret) { | |
176 | PERROR("close"); | |
177 | } | |
fac6795d | 178 | error: |
a8afeb4a | 179 | return ret; |
fac6795d DG |
180 | } |
181 | ||
182 | /* | |
917216f6 DG |
183 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
184 | * MUST be bind(2) before. | |
fac6795d DG |
185 | */ |
186 | int lttcomm_accept_unix_sock(int sock) | |
187 | { | |
188 | int new_fd; | |
189 | struct sockaddr_un sun; | |
190 | socklen_t len = 0; | |
191 | ||
192 | /* Blocking call */ | |
193 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
194 | if (new_fd < 0) { | |
4c462e79 | 195 | PERROR("accept"); |
fac6795d DG |
196 | } |
197 | ||
198 | return new_fd; | |
fac6795d DG |
199 | } |
200 | ||
201 | /* | |
917216f6 DG |
202 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
203 | * and return the fd. | |
fac6795d DG |
204 | */ |
205 | int lttcomm_create_unix_sock(const char *pathname) | |
206 | { | |
207 | struct sockaddr_un sun; | |
208 | int fd; | |
209 | int ret = -1; | |
210 | ||
211 | /* Create server socket */ | |
212 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
4c462e79 | 213 | PERROR("socket"); |
fac6795d DG |
214 | goto error; |
215 | } | |
216 | ||
217 | memset(&sun, 0, sizeof(sun)); | |
218 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
219 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
220 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 221 | |
7d8234d9 MD |
222 | /* Unlink the old file if present */ |
223 | (void) unlink(pathname); | |
fac6795d DG |
224 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
225 | if (ret < 0) { | |
4c462e79 | 226 | PERROR("bind"); |
fac6795d DG |
227 | goto error; |
228 | } | |
229 | ||
230 | return fd; | |
231 | ||
232 | error: | |
233 | return ret; | |
234 | } | |
235 | ||
236 | /* | |
f158a754 | 237 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
238 | */ |
239 | int lttcomm_listen_unix_sock(int sock) | |
240 | { | |
241 | int ret; | |
242 | ||
f158a754 | 243 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d | 244 | if (ret < 0) { |
4c462e79 | 245 | PERROR("listen"); |
fac6795d DG |
246 | } |
247 | ||
248 | return ret; | |
249 | } | |
250 | ||
251 | /* | |
917216f6 DG |
252 | * Receive data of size len in put that data into the buf param. Using recvmsg |
253 | * API. | |
fac6795d | 254 | * |
917216f6 | 255 | * Return the size of received data. |
fac6795d DG |
256 | */ |
257 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
258 | { | |
156ea65a | 259 | struct msghdr msg; |
fac6795d DG |
260 | struct iovec iov[1]; |
261 | ssize_t ret = -1; | |
262 | ||
156ea65a MD |
263 | memset(&msg, 0, sizeof(msg)); |
264 | ||
fac6795d DG |
265 | iov[0].iov_base = buf; |
266 | iov[0].iov_len = len; | |
267 | msg.msg_iov = iov; | |
268 | msg.msg_iovlen = 1; | |
269 | ||
8266852e | 270 | ret = recvmsg(sock, &msg, MSG_WAITALL); |
fac6795d | 271 | if (ret < 0) { |
4c462e79 | 272 | PERROR("recvmsg"); |
fac6795d DG |
273 | } |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | /* | |
917216f6 | 279 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 280 | * |
917216f6 | 281 | * Return the size of sent data. |
fac6795d DG |
282 | */ |
283 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
284 | { | |
156ea65a | 285 | struct msghdr msg; |
fac6795d DG |
286 | struct iovec iov[1]; |
287 | ssize_t ret = -1; | |
288 | ||
156ea65a MD |
289 | memset(&msg, 0, sizeof(msg)); |
290 | ||
fac6795d DG |
291 | iov[0].iov_base = buf; |
292 | iov[0].iov_len = len; | |
293 | msg.msg_iov = iov; | |
294 | msg.msg_iovlen = 1; | |
295 | ||
296 | ret = sendmsg(sock, &msg, 0); | |
297 | if (ret < 0) { | |
d2641a83 MD |
298 | /* |
299 | * Only warn about EPIPE when quiet mode is deactivated. | |
300 | * We consider EPIPE as expected. | |
301 | */ | |
302 | if (errno != EPIPE || !opt_quiet) { | |
303 | PERROR("sendmsg"); | |
304 | } | |
fac6795d DG |
305 | } |
306 | ||
307 | return ret; | |
308 | } | |
87378cf5 DG |
309 | |
310 | /* | |
917216f6 | 311 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
312 | */ |
313 | int lttcomm_close_unix_sock(int sock) | |
314 | { | |
4c462e79 | 315 | int ret, closeret; |
87378cf5 DG |
316 | |
317 | /* Shutdown receptions and transmissions */ | |
318 | ret = shutdown(sock, SHUT_RDWR); | |
319 | if (ret < 0) { | |
4c462e79 | 320 | PERROR("shutdown"); |
87378cf5 DG |
321 | } |
322 | ||
4c462e79 MD |
323 | closeret = close(sock); |
324 | if (closeret) { | |
325 | PERROR("close"); | |
326 | } | |
b0ef677e | 327 | |
87378cf5 DG |
328 | return ret; |
329 | } | |
8c0faa1d DG |
330 | |
331 | /* | |
3bd1e081 MD |
332 | * Send a message accompanied by fd(s) over a unix socket. |
333 | * | |
334 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 335 | */ |
3bd1e081 | 336 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 337 | { |
156ea65a | 338 | struct msghdr msg; |
8c0faa1d DG |
339 | struct cmsghdr *cmptr; |
340 | struct iovec iov[1]; | |
341 | ssize_t ret = -1; | |
342 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
343 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 344 | char dummy = 0; |
8c0faa1d | 345 | |
156ea65a MD |
346 | memset(&msg, 0, sizeof(msg)); |
347 | ||
3bd1e081 MD |
348 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
349 | return -EINVAL; | |
8c0faa1d DG |
350 | |
351 | msg.msg_control = (caddr_t)tmp; | |
352 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
353 | ||
354 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
355 | cmptr->cmsg_level = SOL_SOCKET; |
356 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 357 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 358 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
359 | /* Sum of the length of all control messages in the buffer: */ |
360 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 361 | |
3bd1e081 MD |
362 | iov[0].iov_base = &dummy; |
363 | iov[0].iov_len = 1; | |
8c0faa1d DG |
364 | msg.msg_iov = iov; |
365 | msg.msg_iovlen = 1; | |
366 | ||
367 | ret = sendmsg(sock, &msg, 0); | |
368 | if (ret < 0) { | |
d2641a83 MD |
369 | /* |
370 | * Only warn about EPIPE when quiet mode is deactivated. | |
371 | * We consider EPIPE as expected. | |
372 | */ | |
373 | if (errno != EPIPE || !opt_quiet) { | |
374 | PERROR("sendmsg"); | |
375 | } | |
8c0faa1d | 376 | } |
8c0faa1d DG |
377 | return ret; |
378 | } | |
09de5c68 DG |
379 | |
380 | /* | |
3bd1e081 | 381 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 382 | * |
3bd1e081 MD |
383 | * Returns the size of received data, or negative error value. |
384 | * | |
385 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
386 | * actually received in nb_fd. | |
09de5c68 | 387 | */ |
3bd1e081 | 388 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
389 | { |
390 | struct iovec iov[1]; | |
3bd1e081 | 391 | ssize_t ret = 0; |
09de5c68 | 392 | struct cmsghdr *cmsg; |
3bd1e081 MD |
393 | size_t sizeof_fds = nb_fd * sizeof(int); |
394 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
156ea65a | 395 | struct msghdr msg; |
3bd1e081 | 396 | char dummy; |
09de5c68 | 397 | |
156ea65a MD |
398 | memset(&msg, 0, sizeof(msg)); |
399 | ||
09de5c68 | 400 | /* Prepare to receive the structures */ |
3bd1e081 MD |
401 | iov[0].iov_base = &dummy; |
402 | iov[0].iov_len = 1; | |
09de5c68 DG |
403 | msg.msg_iov = iov; |
404 | msg.msg_iovlen = 1; | |
405 | msg.msg_control = recv_fd; | |
406 | msg.msg_controllen = sizeof(recv_fd); | |
407 | ||
408 | ret = recvmsg(sock, &msg, 0); | |
409 | if (ret < 0) { | |
4c462e79 | 410 | PERROR("recvmsg fds"); |
09de5c68 DG |
411 | goto end; |
412 | } | |
3bd1e081 MD |
413 | if (ret != 1) { |
414 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
415 | ret, 1); | |
416 | goto end; | |
417 | } | |
418 | if (msg.msg_flags & MSG_CTRUNC) { | |
419 | fprintf(stderr, "Error: Control message truncated.\n"); | |
420 | ret = -1; | |
09de5c68 DG |
421 | goto end; |
422 | } | |
09de5c68 DG |
423 | cmsg = CMSG_FIRSTHDR(&msg); |
424 | if (!cmsg) { | |
3bd1e081 | 425 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
426 | ret = -1; |
427 | goto end; | |
428 | } | |
09de5c68 | 429 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 430 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
431 | ret = -1; |
432 | goto end; | |
433 | } | |
3bd1e081 MD |
434 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
435 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 436 | (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); |
3bd1e081 MD |
437 | ret = -1; |
438 | goto end; | |
09de5c68 | 439 | } |
3bd1e081 MD |
440 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
441 | ret = sizeof_fds; | |
09de5c68 DG |
442 | end: |
443 | return ret; | |
444 | } | |
d19d9ada DG |
445 | |
446 | /* | |
447 | * Send a message with credentials over a unix socket. | |
448 | * | |
449 | * Returns the size of data sent, or negative error value. | |
450 | */ | |
451 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) | |
452 | { | |
156ea65a | 453 | struct msghdr msg; |
d19d9ada DG |
454 | struct iovec iov[1]; |
455 | ssize_t ret = -1; | |
d27c42b8 MD |
456 | #ifdef __linux__ |
457 | struct cmsghdr *cmptr; | |
b17231c6 | 458 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 459 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
b17231c6 | 460 | lttng_sock_cred *creds; |
d27c42b8 | 461 | #endif /* __linux__ */ |
d19d9ada | 462 | |
156ea65a MD |
463 | memset(&msg, 0, sizeof(msg)); |
464 | ||
d19d9ada DG |
465 | iov[0].iov_base = buf; |
466 | iov[0].iov_len = len; | |
467 | msg.msg_iov = iov; | |
468 | msg.msg_iovlen = 1; | |
469 | ||
d27c42b8 | 470 | #ifdef __linux__ |
d19d9ada DG |
471 | msg.msg_control = (caddr_t) anc_buf; |
472 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
473 | ||
474 | cmptr = CMSG_FIRSTHDR(&msg); | |
475 | cmptr->cmsg_level = SOL_SOCKET; | |
b17231c6 | 476 | cmptr->cmsg_type = LTTNG_SOCK_CREDS; |
d19d9ada DG |
477 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); |
478 | ||
b17231c6 | 479 | creds = (lttng_sock_cred*) CMSG_DATA(cmptr); |
d19d9ada | 480 | |
b17231c6 DG |
481 | LTTNG_SOCK_SET_UID_CRED(creds, geteuid()); |
482 | LTTNG_SOCK_SET_GID_CRED(creds, getegid()); | |
483 | LTTNG_SOCK_SET_PID_CRED(creds, getpid()); | |
d27c42b8 | 484 | #endif /* __linux__ */ |
d19d9ada DG |
485 | |
486 | ret = sendmsg(sock, &msg, 0); | |
487 | if (ret < 0) { | |
d2641a83 MD |
488 | /* |
489 | * Only warn about EPIPE when quiet mode is deactivated. | |
490 | * We consider EPIPE as expected. | |
491 | */ | |
492 | if (errno != EPIPE || !opt_quiet) { | |
493 | PERROR("sendmsg"); | |
494 | } | |
d19d9ada | 495 | } |
d19d9ada DG |
496 | return ret; |
497 | } | |
498 | ||
499 | /* | |
500 | * Recv a message accompanied with credentials from a unix socket. | |
501 | * | |
502 | * Returns the size of received data, or negative error value. | |
503 | */ | |
504 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
b17231c6 | 505 | lttng_sock_cred *creds) |
d19d9ada | 506 | { |
156ea65a | 507 | struct msghdr msg; |
d19d9ada DG |
508 | struct iovec iov[1]; |
509 | ssize_t ret; | |
d27c42b8 MD |
510 | #ifdef __linux__ |
511 | struct cmsghdr *cmptr; | |
b17231c6 | 512 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 513 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
d27c42b8 | 514 | #endif /* __linux__ */ |
d19d9ada | 515 | |
156ea65a MD |
516 | memset(&msg, 0, sizeof(msg)); |
517 | ||
d19d9ada DG |
518 | /* Not allowed */ |
519 | if (creds == NULL) { | |
520 | ret = -1; | |
521 | goto end; | |
522 | } | |
523 | ||
524 | /* Prepare to receive the structures */ | |
525 | iov[0].iov_base = buf; | |
526 | iov[0].iov_len = len; | |
527 | msg.msg_iov = iov; | |
528 | msg.msg_iovlen = 1; | |
529 | ||
d27c42b8 | 530 | #ifdef __linux__ |
d19d9ada DG |
531 | msg.msg_control = anc_buf; |
532 | msg.msg_controllen = sizeof(anc_buf); | |
d27c42b8 | 533 | #endif /* __linux__ */ |
d19d9ada DG |
534 | |
535 | ret = recvmsg(sock, &msg, 0); | |
536 | if (ret < 0) { | |
4c462e79 | 537 | PERROR("recvmsg fds"); |
d19d9ada DG |
538 | goto end; |
539 | } | |
540 | ||
d27c42b8 | 541 | #ifdef __linux__ |
d19d9ada DG |
542 | if (msg.msg_flags & MSG_CTRUNC) { |
543 | fprintf(stderr, "Error: Control message truncated.\n"); | |
544 | ret = -1; | |
545 | goto end; | |
546 | } | |
547 | ||
548 | cmptr = CMSG_FIRSTHDR(&msg); | |
549 | if (cmptr == NULL) { | |
550 | fprintf(stderr, "Error: Invalid control message header\n"); | |
551 | ret = -1; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | if (cmptr->cmsg_level != SOL_SOCKET || | |
b17231c6 | 556 | cmptr->cmsg_type != LTTNG_SOCK_CREDS) { |
d19d9ada DG |
557 | fprintf(stderr, "Didn't received any credentials\n"); |
558 | ret = -1; | |
559 | goto end; | |
560 | } | |
561 | ||
562 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
563 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 564 | (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred)); |
d19d9ada DG |
565 | ret = -1; |
566 | goto end; | |
567 | } | |
568 | ||
569 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
d27c42b8 | 570 | #elif defined(__FreeBSD__) |
9e89c931 MD |
571 | { |
572 | int peer_ret; | |
573 | ||
574 | peer_ret = getpeereid(sock, &creds->uid, &creds->gid); | |
575 | if (peer_ret != 0) { | |
576 | return peer_ret; | |
577 | } | |
67cf0ab7 | 578 | } |
d27c42b8 MD |
579 | #else |
580 | #error "Please implement credential support for your OS." | |
581 | #endif /* __linux__ */ | |
d19d9ada DG |
582 | |
583 | end: | |
584 | return ret; | |
585 | } | |
586 | ||
587 | /* | |
588 | * Set socket option to use credentials passing. | |
589 | */ | |
d27c42b8 | 590 | #ifdef __linux__ |
d19d9ada DG |
591 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
592 | { | |
593 | int ret, on = 1; | |
594 | ||
595 | /* Set socket for credentials retrieval */ | |
596 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
597 | if (ret < 0) { | |
4c462e79 | 598 | PERROR("setsockopt creds unix sock"); |
d19d9ada | 599 | } |
d19d9ada DG |
600 | return ret; |
601 | } | |
d27c42b8 MD |
602 | #elif defined(__FreeBSD__) |
603 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
604 | { | |
605 | return 0; | |
606 | } | |
607 | #else | |
608 | #error "Please implement credential support for your OS." | |
609 | #endif /* __linux__ */ |