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 DG |
30 | #include <common/defaults.h> |
31 | ||
10a8a223 | 32 | #include "sessiond-comm.h" |
fac6795d DG |
33 | |
34 | /* | |
35 | * Human readable error message. | |
36 | */ | |
37 | static const char *lttcomm_readable_code[] = { | |
38 | [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success", | |
39 | [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error", | |
40 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command", | |
7d29a247 DG |
41 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented", |
42 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain", | |
fac6795d DG |
43 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found", |
44 | [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps", | |
e065084a | 45 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found", |
f3ed775e | 46 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found", |
ce3d728c | 47 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found", |
ca95a216 | 48 | [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon", |
ae856491 | 49 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_DIR_FAIL) ] = "Create directory failed", |
379473d2 | 50 | [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed", |
520ff687 | 51 | [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed", |
379473d2 DG |
52 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable", |
53 | [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected", | |
27673bb6 | 54 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist", |
d9800920 | 55 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket", |
2b0bf864 | 56 | [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found", |
8e0af1b4 | 57 | [ LTTCOMM_ERR_INDEX(LTTCOMM_EPERM) ] = "Permission denied", |
20fe2104 | 58 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available", |
394016d1 | 59 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible", |
7d29a247 | 60 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists", |
20fe2104 DG |
61 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed", |
62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed", | |
f3ed775e | 63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found", |
26cc6b4e | 64 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed", |
d36b8583 | 65 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed", |
d65106b1 | 66 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed", |
f34daff7 DG |
67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed", |
68 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed", | |
aaf26714 | 69 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed", |
8c0faa1d DG |
70 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed", |
71 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed", | |
72 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed", | |
73 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed", | |
74 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed", | |
75 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist", | |
84291629 | 76 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found", |
2ef84c95 | 77 | [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed", |
4466912f | 78 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CALIBRATE_FAIL) ] = "UST calibration failed", |
e0c7ec2b | 79 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_VERSION) ] = "UST tracer version is not compatible", |
0177d773 | 80 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed", |
2b0bf864 | 81 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed", |
f6a9efaa | 82 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist", |
2bdd86d4 MD |
83 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found", |
84 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed", | |
85 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed", | |
86 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed", | |
87 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed", | |
88 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed", | |
89 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed", | |
90 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed", | |
91 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed", | |
7753dea8 MD |
92 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed", |
93 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed", | |
2bdd86d4 MD |
94 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed", |
95 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed", | |
96 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist", | |
97 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found", | |
98 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed", | |
3b25d04d | 99 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist", |
be4f0921 | 100 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found", |
ae357384 | 101 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist", |
ae856491 | 102 | [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context", |
3bd1e081 MD |
103 | [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready", |
104 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds", | |
105 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds", | |
f2fc6720 | 106 | [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command", |
3bd1e081 MD |
107 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread", |
108 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd", | |
109 | [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up", | |
110 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally", | |
111 | [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error", | |
112 | [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile", | |
113 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF", | |
114 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL", | |
115 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM", | |
116 | [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE", | |
d65106b1 | 117 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found", |
fac6795d DG |
118 | }; |
119 | ||
120 | /* | |
917216f6 DG |
121 | * Return ptr to string representing a human readable error code from the |
122 | * lttcomm_return_code enum. | |
fac6795d | 123 | * |
917216f6 | 124 | * These code MUST be negative in other to treat that as an error value. |
fac6795d DG |
125 | */ |
126 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) | |
127 | { | |
128 | int tmp_code = -code; | |
129 | ||
130 | if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) { | |
131 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)]; | |
132 | } | |
133 | ||
134 | return "Unknown error code"; | |
135 | } | |
136 | ||
137 | /* | |
917216f6 | 138 | * Connect to unix socket using the path name. |
fac6795d DG |
139 | */ |
140 | int lttcomm_connect_unix_sock(const char *pathname) | |
141 | { | |
686204ab MD |
142 | struct sockaddr_un sun; |
143 | int fd; | |
a8afeb4a | 144 | int ret; |
fac6795d | 145 | |
686204ab | 146 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
fac6795d DG |
147 | if (fd < 0) { |
148 | perror("socket"); | |
a8afeb4a | 149 | ret = fd; |
fac6795d DG |
150 | goto error; |
151 | } | |
152 | ||
686204ab MD |
153 | memset(&sun, 0, sizeof(sun)); |
154 | sun.sun_family = AF_UNIX; | |
155 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); | |
99497cd0 | 156 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; |
fac6795d | 157 | |
686204ab MD |
158 | ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); |
159 | if (ret < 0) { | |
a8afeb4a | 160 | /* |
917216f6 DG |
161 | * Don't print message on connect error, because connect is used in |
162 | * normal execution to detect if sessiond is alive. | |
a8afeb4a MD |
163 | */ |
164 | goto error_connect; | |
686204ab | 165 | } |
fac6795d | 166 | |
686204ab | 167 | return fd; |
fac6795d | 168 | |
a8afeb4a MD |
169 | error_connect: |
170 | close(fd); | |
fac6795d | 171 | error: |
a8afeb4a | 172 | return ret; |
fac6795d DG |
173 | } |
174 | ||
175 | /* | |
917216f6 DG |
176 | * Do an accept(2) on the sock and return the new file descriptor. The socket |
177 | * MUST be bind(2) before. | |
fac6795d DG |
178 | */ |
179 | int lttcomm_accept_unix_sock(int sock) | |
180 | { | |
181 | int new_fd; | |
182 | struct sockaddr_un sun; | |
183 | socklen_t len = 0; | |
184 | ||
185 | /* Blocking call */ | |
186 | new_fd = accept(sock, (struct sockaddr *) &sun, &len); | |
187 | if (new_fd < 0) { | |
188 | perror("accept"); | |
fac6795d DG |
189 | } |
190 | ||
191 | return new_fd; | |
fac6795d DG |
192 | } |
193 | ||
194 | /* | |
917216f6 DG |
195 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation |
196 | * and return the fd. | |
fac6795d DG |
197 | */ |
198 | int lttcomm_create_unix_sock(const char *pathname) | |
199 | { | |
200 | struct sockaddr_un sun; | |
201 | int fd; | |
202 | int ret = -1; | |
203 | ||
204 | /* Create server socket */ | |
205 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
206 | perror("socket"); | |
207 | goto error; | |
208 | } | |
209 | ||
210 | memset(&sun, 0, sizeof(sun)); | |
211 | sun.sun_family = AF_UNIX; | |
99497cd0 MD |
212 | strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); |
213 | sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; | |
fac6795d | 214 | |
7d8234d9 MD |
215 | /* Unlink the old file if present */ |
216 | (void) unlink(pathname); | |
fac6795d DG |
217 | ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); |
218 | if (ret < 0) { | |
219 | perror("bind"); | |
220 | goto error; | |
221 | } | |
222 | ||
223 | return fd; | |
224 | ||
225 | error: | |
226 | return ret; | |
227 | } | |
228 | ||
229 | /* | |
f158a754 | 230 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. |
fac6795d DG |
231 | */ |
232 | int lttcomm_listen_unix_sock(int sock) | |
233 | { | |
234 | int ret; | |
235 | ||
f158a754 | 236 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); |
fac6795d DG |
237 | if (ret < 0) { |
238 | perror("listen"); | |
239 | } | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | /* | |
917216f6 DG |
245 | * Receive data of size len in put that data into the buf param. Using recvmsg |
246 | * API. | |
fac6795d | 247 | * |
917216f6 | 248 | * Return the size of received data. |
fac6795d DG |
249 | */ |
250 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
251 | { | |
156ea65a | 252 | struct msghdr msg; |
fac6795d DG |
253 | struct iovec iov[1]; |
254 | ssize_t ret = -1; | |
255 | ||
156ea65a MD |
256 | memset(&msg, 0, sizeof(msg)); |
257 | ||
fac6795d DG |
258 | iov[0].iov_base = buf; |
259 | iov[0].iov_len = len; | |
260 | msg.msg_iov = iov; | |
261 | msg.msg_iovlen = 1; | |
262 | ||
8266852e | 263 | ret = recvmsg(sock, &msg, MSG_WAITALL); |
fac6795d DG |
264 | if (ret < 0) { |
265 | perror("recvmsg"); | |
266 | } | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
271 | /* | |
917216f6 | 272 | * Send buf data of size len. Using sendmsg API. |
fac6795d | 273 | * |
917216f6 | 274 | * Return the size of sent data. |
fac6795d DG |
275 | */ |
276 | ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) | |
277 | { | |
156ea65a | 278 | struct msghdr msg; |
fac6795d DG |
279 | struct iovec iov[1]; |
280 | ssize_t ret = -1; | |
281 | ||
156ea65a MD |
282 | memset(&msg, 0, sizeof(msg)); |
283 | ||
fac6795d DG |
284 | iov[0].iov_base = buf; |
285 | iov[0].iov_len = len; | |
286 | msg.msg_iov = iov; | |
287 | msg.msg_iovlen = 1; | |
288 | ||
289 | ret = sendmsg(sock, &msg, 0); | |
290 | if (ret < 0) { | |
291 | perror("sendmsg"); | |
292 | } | |
293 | ||
294 | return ret; | |
295 | } | |
87378cf5 DG |
296 | |
297 | /* | |
917216f6 | 298 | * Shutdown cleanly a unix socket. |
87378cf5 DG |
299 | */ |
300 | int lttcomm_close_unix_sock(int sock) | |
301 | { | |
302 | int ret; | |
303 | ||
304 | /* Shutdown receptions and transmissions */ | |
305 | ret = shutdown(sock, SHUT_RDWR); | |
306 | if (ret < 0) { | |
307 | perror("shutdown"); | |
308 | } | |
309 | ||
b0ef677e DG |
310 | close(sock); |
311 | ||
87378cf5 DG |
312 | return ret; |
313 | } | |
8c0faa1d DG |
314 | |
315 | /* | |
3bd1e081 MD |
316 | * Send a message accompanied by fd(s) over a unix socket. |
317 | * | |
318 | * Returns the size of data sent, or negative error value. | |
8c0faa1d | 319 | */ |
3bd1e081 | 320 | ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
8c0faa1d | 321 | { |
156ea65a | 322 | struct msghdr msg; |
8c0faa1d DG |
323 | struct cmsghdr *cmptr; |
324 | struct iovec iov[1]; | |
325 | ssize_t ret = -1; | |
326 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
327 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
3bd1e081 | 328 | char dummy = 0; |
8c0faa1d | 329 | |
156ea65a MD |
330 | memset(&msg, 0, sizeof(msg)); |
331 | ||
3bd1e081 MD |
332 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) |
333 | return -EINVAL; | |
8c0faa1d DG |
334 | |
335 | msg.msg_control = (caddr_t)tmp; | |
336 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
337 | ||
338 | cmptr = CMSG_FIRSTHDR(&msg); | |
8c0faa1d DG |
339 | cmptr->cmsg_level = SOL_SOCKET; |
340 | cmptr->cmsg_type = SCM_RIGHTS; | |
159c7ff4 | 341 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); |
8c0faa1d | 342 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); |
159c7ff4 MD |
343 | /* Sum of the length of all control messages in the buffer: */ |
344 | msg.msg_controllen = cmptr->cmsg_len; | |
8c0faa1d | 345 | |
3bd1e081 MD |
346 | iov[0].iov_base = &dummy; |
347 | iov[0].iov_len = 1; | |
8c0faa1d DG |
348 | msg.msg_iov = iov; |
349 | msg.msg_iovlen = 1; | |
350 | ||
351 | ret = sendmsg(sock, &msg, 0); | |
352 | if (ret < 0) { | |
353 | perror("sendmsg"); | |
354 | } | |
8c0faa1d DG |
355 | return ret; |
356 | } | |
09de5c68 DG |
357 | |
358 | /* | |
3bd1e081 | 359 | * Recv a message accompanied by fd(s) from a unix socket. |
09de5c68 | 360 | * |
3bd1e081 MD |
361 | * Returns the size of received data, or negative error value. |
362 | * | |
363 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
364 | * actually received in nb_fd. | |
09de5c68 | 365 | */ |
3bd1e081 | 366 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
09de5c68 DG |
367 | { |
368 | struct iovec iov[1]; | |
3bd1e081 | 369 | ssize_t ret = 0; |
09de5c68 | 370 | struct cmsghdr *cmsg; |
3bd1e081 MD |
371 | size_t sizeof_fds = nb_fd * sizeof(int); |
372 | char recv_fd[CMSG_SPACE(sizeof_fds)]; | |
156ea65a | 373 | struct msghdr msg; |
3bd1e081 | 374 | char dummy; |
09de5c68 | 375 | |
156ea65a MD |
376 | memset(&msg, 0, sizeof(msg)); |
377 | ||
09de5c68 | 378 | /* Prepare to receive the structures */ |
3bd1e081 MD |
379 | iov[0].iov_base = &dummy; |
380 | iov[0].iov_len = 1; | |
09de5c68 DG |
381 | msg.msg_iov = iov; |
382 | msg.msg_iovlen = 1; | |
383 | msg.msg_control = recv_fd; | |
384 | msg.msg_controllen = sizeof(recv_fd); | |
385 | ||
386 | ret = recvmsg(sock, &msg, 0); | |
387 | if (ret < 0) { | |
388 | perror("recvmsg fds"); | |
389 | goto end; | |
390 | } | |
3bd1e081 MD |
391 | if (ret != 1) { |
392 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
393 | ret, 1); | |
394 | goto end; | |
395 | } | |
396 | if (msg.msg_flags & MSG_CTRUNC) { | |
397 | fprintf(stderr, "Error: Control message truncated.\n"); | |
398 | ret = -1; | |
09de5c68 DG |
399 | goto end; |
400 | } | |
09de5c68 DG |
401 | cmsg = CMSG_FIRSTHDR(&msg); |
402 | if (!cmsg) { | |
3bd1e081 | 403 | fprintf(stderr, "Error: Invalid control message header\n"); |
09de5c68 DG |
404 | ret = -1; |
405 | goto end; | |
406 | } | |
09de5c68 | 407 | if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { |
3bd1e081 | 408 | fprintf(stderr, "Didn't received any fd\n"); |
09de5c68 DG |
409 | ret = -1; |
410 | goto end; | |
411 | } | |
3bd1e081 MD |
412 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { |
413 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 414 | (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); |
3bd1e081 MD |
415 | ret = -1; |
416 | goto end; | |
09de5c68 | 417 | } |
3bd1e081 MD |
418 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); |
419 | ret = sizeof_fds; | |
09de5c68 DG |
420 | end: |
421 | return ret; | |
422 | } | |
d19d9ada DG |
423 | |
424 | /* | |
425 | * Send a message with credentials over a unix socket. | |
426 | * | |
427 | * Returns the size of data sent, or negative error value. | |
428 | */ | |
429 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) | |
430 | { | |
156ea65a | 431 | struct msghdr msg; |
d19d9ada DG |
432 | struct iovec iov[1]; |
433 | ssize_t ret = -1; | |
d27c42b8 MD |
434 | #ifdef __linux__ |
435 | struct cmsghdr *cmptr; | |
b17231c6 | 436 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 437 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
b17231c6 | 438 | lttng_sock_cred *creds; |
d27c42b8 | 439 | #endif /* __linux__ */ |
d19d9ada | 440 | |
156ea65a MD |
441 | memset(&msg, 0, sizeof(msg)); |
442 | ||
d19d9ada DG |
443 | iov[0].iov_base = buf; |
444 | iov[0].iov_len = len; | |
445 | msg.msg_iov = iov; | |
446 | msg.msg_iovlen = 1; | |
447 | ||
d27c42b8 | 448 | #ifdef __linux__ |
d19d9ada DG |
449 | msg.msg_control = (caddr_t) anc_buf; |
450 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
451 | ||
452 | cmptr = CMSG_FIRSTHDR(&msg); | |
453 | cmptr->cmsg_level = SOL_SOCKET; | |
b17231c6 | 454 | cmptr->cmsg_type = LTTNG_SOCK_CREDS; |
d19d9ada DG |
455 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); |
456 | ||
b17231c6 | 457 | creds = (lttng_sock_cred*) CMSG_DATA(cmptr); |
d19d9ada | 458 | |
b17231c6 DG |
459 | LTTNG_SOCK_SET_UID_CRED(creds, geteuid()); |
460 | LTTNG_SOCK_SET_GID_CRED(creds, getegid()); | |
461 | LTTNG_SOCK_SET_PID_CRED(creds, getpid()); | |
d27c42b8 | 462 | #endif /* __linux__ */ |
d19d9ada DG |
463 | |
464 | ret = sendmsg(sock, &msg, 0); | |
465 | if (ret < 0) { | |
466 | perror("sendmsg"); | |
467 | } | |
468 | ||
469 | return ret; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Recv a message accompanied with credentials from a unix socket. | |
474 | * | |
475 | * Returns the size of received data, or negative error value. | |
476 | */ | |
477 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
b17231c6 | 478 | lttng_sock_cred *creds) |
d19d9ada | 479 | { |
156ea65a | 480 | struct msghdr msg; |
d19d9ada DG |
481 | struct iovec iov[1]; |
482 | ssize_t ret; | |
d27c42b8 MD |
483 | #ifdef __linux__ |
484 | struct cmsghdr *cmptr; | |
b17231c6 | 485 | size_t sizeof_cred = sizeof(lttng_sock_cred); |
d19d9ada | 486 | char anc_buf[CMSG_SPACE(sizeof_cred)]; |
d27c42b8 | 487 | #endif /* __linux__ */ |
d19d9ada | 488 | |
156ea65a MD |
489 | memset(&msg, 0, sizeof(msg)); |
490 | ||
d19d9ada DG |
491 | /* Not allowed */ |
492 | if (creds == NULL) { | |
493 | ret = -1; | |
494 | goto end; | |
495 | } | |
496 | ||
497 | /* Prepare to receive the structures */ | |
498 | iov[0].iov_base = buf; | |
499 | iov[0].iov_len = len; | |
500 | msg.msg_iov = iov; | |
501 | msg.msg_iovlen = 1; | |
502 | ||
d27c42b8 | 503 | #ifdef __linux__ |
d19d9ada DG |
504 | msg.msg_control = anc_buf; |
505 | msg.msg_controllen = sizeof(anc_buf); | |
d27c42b8 | 506 | #endif /* __linux__ */ |
d19d9ada DG |
507 | |
508 | ret = recvmsg(sock, &msg, 0); | |
509 | if (ret < 0) { | |
510 | perror("recvmsg fds"); | |
511 | goto end; | |
512 | } | |
513 | ||
d27c42b8 | 514 | #ifdef __linux__ |
d19d9ada DG |
515 | if (msg.msg_flags & MSG_CTRUNC) { |
516 | fprintf(stderr, "Error: Control message truncated.\n"); | |
517 | ret = -1; | |
518 | goto end; | |
519 | } | |
520 | ||
521 | cmptr = CMSG_FIRSTHDR(&msg); | |
522 | if (cmptr == NULL) { | |
523 | fprintf(stderr, "Error: Invalid control message header\n"); | |
524 | ret = -1; | |
525 | goto end; | |
526 | } | |
527 | ||
528 | if (cmptr->cmsg_level != SOL_SOCKET || | |
b17231c6 | 529 | cmptr->cmsg_type != LTTNG_SOCK_CREDS) { |
d19d9ada DG |
530 | fprintf(stderr, "Didn't received any credentials\n"); |
531 | ret = -1; | |
532 | goto end; | |
533 | } | |
534 | ||
535 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
536 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
b17231c6 | 537 | (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred)); |
d19d9ada DG |
538 | ret = -1; |
539 | goto end; | |
540 | } | |
541 | ||
542 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
d27c42b8 | 543 | #elif defined(__FreeBSD__) |
9e89c931 MD |
544 | { |
545 | int peer_ret; | |
546 | ||
547 | peer_ret = getpeereid(sock, &creds->uid, &creds->gid); | |
548 | if (peer_ret != 0) { | |
549 | return peer_ret; | |
550 | } | |
67cf0ab7 | 551 | } |
d27c42b8 MD |
552 | #else |
553 | #error "Please implement credential support for your OS." | |
554 | #endif /* __linux__ */ | |
d19d9ada DG |
555 | |
556 | end: | |
557 | return ret; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Set socket option to use credentials passing. | |
562 | */ | |
d27c42b8 | 563 | #ifdef __linux__ |
d19d9ada DG |
564 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
565 | { | |
566 | int ret, on = 1; | |
567 | ||
568 | /* Set socket for credentials retrieval */ | |
569 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
570 | if (ret < 0) { | |
571 | perror("setsockopt creds unix sock"); | |
572 | } | |
d19d9ada DG |
573 | return ret; |
574 | } | |
d27c42b8 MD |
575 | #elif defined(__FreeBSD__) |
576 | int lttcomm_setsockopt_creds_unix_sock(int sock) | |
577 | { | |
578 | return 0; | |
579 | } | |
580 | #else | |
581 | #error "Please implement credential support for your OS." | |
582 | #endif /* __linux__ */ |