Revert FreeBSD compatibility layer
[lttng-tools.git] / src / common / sessiond-comm / sessiond-comm.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
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.
8 *
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.
13 *
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.
17 */
18
19 #define _GNU_SOURCE
20 #include <assert.h>
21 #include <limits.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <sys/un.h>
28 #include <unistd.h>
29 #include <errno.h>
30
31 #include <common/defaults.h>
32
33 #include "sessiond-comm.h"
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",
42 [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented",
43 [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
44 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
45 [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
46 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
47 [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found",
48 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
49 [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
50 [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_DIR_FAIL) ] = "Create directory failed",
51 [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
52 [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
53 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
54 [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
55 [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
56 [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket",
57 [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found",
58 [ LTTCOMM_ERR_INDEX(LTTCOMM_EPERM) ] = "Permission denied",
59 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
60 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible",
61 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists",
62 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
63 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
64 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
65 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
66 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed",
67 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed",
68 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
69 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
70 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
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",
77 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
78 [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
79 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CALIBRATE_FAIL) ] = "UST calibration failed",
80 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_VERSION) ] = "UST tracer version is not compatible",
81 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed",
82 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed",
83 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist",
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",
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",
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",
100 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist",
101 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found",
102 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist",
103 [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context",
104 [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready",
105 [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds",
106 [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds",
107 [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command",
108 [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread",
109 [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd",
110 [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up",
111 [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally",
112 [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error",
113 [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile",
114 [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF",
115 [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL",
116 [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM",
117 [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE",
118 [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found",
119 };
120
121 /*
122 * Return ptr to string representing a human readable error code from the
123 * lttcomm_return_code enum.
124 *
125 * These code MUST be negative in other to treat that as an error value.
126 */
127 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
128 {
129 int tmp_code = -code;
130
131 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
132 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
133 }
134
135 return "Unknown error code";
136 }
137
138 /*
139 * Connect to unix socket using the path name.
140 */
141 int lttcomm_connect_unix_sock(const char *pathname)
142 {
143 struct sockaddr_un sun;
144 int fd;
145 int ret;
146
147 fd = socket(PF_UNIX, SOCK_STREAM, 0);
148 if (fd < 0) {
149 perror("socket");
150 ret = fd;
151 goto error;
152 }
153
154 memset(&sun, 0, sizeof(sun));
155 sun.sun_family = AF_UNIX;
156 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
157 sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
158
159 ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
160 if (ret < 0) {
161 /*
162 * Don't print message on connect error, because connect is used in
163 * normal execution to detect if sessiond is alive.
164 */
165 goto error_connect;
166 }
167
168 return fd;
169
170 error_connect:
171 close(fd);
172 error:
173 return ret;
174 }
175
176 /*
177 * Do an accept(2) on the sock and return the new file descriptor. The socket
178 * MUST be bind(2) before.
179 */
180 int lttcomm_accept_unix_sock(int sock)
181 {
182 int new_fd;
183 struct sockaddr_un sun;
184 socklen_t len = 0;
185
186 /* Blocking call */
187 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
188 if (new_fd < 0) {
189 perror("accept");
190 }
191
192 return new_fd;
193 }
194
195 /*
196 * Creates a AF_UNIX local socket using pathname bind the socket upon creation
197 * and return the fd.
198 */
199 int lttcomm_create_unix_sock(const char *pathname)
200 {
201 struct sockaddr_un sun;
202 int fd;
203 int ret = -1;
204
205 /* Create server socket */
206 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
207 perror("socket");
208 goto error;
209 }
210
211 memset(&sun, 0, sizeof(sun));
212 sun.sun_family = AF_UNIX;
213 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
214 sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
215
216 /* Unlink the old file if present */
217 (void) unlink(pathname);
218 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
219 if (ret < 0) {
220 perror("bind");
221 goto error;
222 }
223
224 return fd;
225
226 error:
227 return ret;
228 }
229
230 /*
231 * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
232 */
233 int lttcomm_listen_unix_sock(int sock)
234 {
235 int ret;
236
237 ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN);
238 if (ret < 0) {
239 perror("listen");
240 }
241
242 return ret;
243 }
244
245 /*
246 * Receive data of size len in put that data into the buf param. Using recvmsg
247 * API.
248 *
249 * Return the size of received data.
250 */
251 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
252 {
253 struct msghdr msg;
254 struct iovec iov[1];
255 ssize_t ret = -1;
256
257 memset(&msg, 0, sizeof(msg));
258
259 iov[0].iov_base = buf;
260 iov[0].iov_len = len;
261 msg.msg_iov = iov;
262 msg.msg_iovlen = 1;
263
264 ret = recvmsg(sock, &msg, MSG_WAITALL);
265 if (ret < 0) {
266 perror("recvmsg");
267 }
268
269 return ret;
270 }
271
272 /*
273 * Send buf data of size len. Using sendmsg API.
274 *
275 * Return the size of sent data.
276 */
277 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
278 {
279 struct msghdr msg;
280 struct iovec iov[1];
281 ssize_t ret = -1;
282
283 memset(&msg, 0, sizeof(msg));
284
285 iov[0].iov_base = buf;
286 iov[0].iov_len = len;
287 msg.msg_iov = iov;
288 msg.msg_iovlen = 1;
289
290 ret = sendmsg(sock, &msg, 0);
291 if (ret < 0) {
292 perror("sendmsg");
293 }
294
295 return ret;
296 }
297
298 /*
299 * Shutdown cleanly a unix socket.
300 */
301 int lttcomm_close_unix_sock(int sock)
302 {
303 int ret;
304
305 /* Shutdown receptions and transmissions */
306 ret = shutdown(sock, SHUT_RDWR);
307 if (ret < 0) {
308 perror("shutdown");
309 }
310
311 close(sock);
312
313 return ret;
314 }
315
316 /*
317 * Send a message accompanied by fd(s) over a unix socket.
318 *
319 * Returns the size of data sent, or negative error value.
320 */
321 ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
322 {
323 struct msghdr msg;
324 struct cmsghdr *cmptr;
325 struct iovec iov[1];
326 ssize_t ret = -1;
327 unsigned int sizeof_fds = nb_fd * sizeof(int);
328 char tmp[CMSG_SPACE(sizeof_fds)];
329 char dummy = 0;
330
331 memset(&msg, 0, sizeof(msg));
332
333 if (nb_fd > LTTCOMM_MAX_SEND_FDS)
334 return -EINVAL;
335
336 msg.msg_control = (caddr_t)tmp;
337 msg.msg_controllen = CMSG_LEN(sizeof_fds);
338
339 cmptr = CMSG_FIRSTHDR(&msg);
340 cmptr->cmsg_level = SOL_SOCKET;
341 cmptr->cmsg_type = SCM_RIGHTS;
342 cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
343 memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
344 /* Sum of the length of all control messages in the buffer: */
345 msg.msg_controllen = cmptr->cmsg_len;
346
347 iov[0].iov_base = &dummy;
348 iov[0].iov_len = 1;
349 msg.msg_iov = iov;
350 msg.msg_iovlen = 1;
351
352 ret = sendmsg(sock, &msg, 0);
353 if (ret < 0) {
354 perror("sendmsg");
355 }
356 return ret;
357 }
358
359 /*
360 * Recv a message accompanied by fd(s) from a unix socket.
361 *
362 * Returns the size of received data, or negative error value.
363 *
364 * Expect at most "nb_fd" file descriptors. Returns the number of fd
365 * actually received in nb_fd.
366 */
367 ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
368 {
369 struct iovec iov[1];
370 ssize_t ret = 0;
371 struct cmsghdr *cmsg;
372 size_t sizeof_fds = nb_fd * sizeof(int);
373 char recv_fd[CMSG_SPACE(sizeof_fds)];
374 struct msghdr msg;
375 char dummy;
376
377 memset(&msg, 0, sizeof(msg));
378
379 /* Prepare to receive the structures */
380 iov[0].iov_base = &dummy;
381 iov[0].iov_len = 1;
382 msg.msg_iov = iov;
383 msg.msg_iovlen = 1;
384 msg.msg_control = recv_fd;
385 msg.msg_controllen = sizeof(recv_fd);
386
387 ret = recvmsg(sock, &msg, 0);
388 if (ret < 0) {
389 perror("recvmsg fds");
390 goto end;
391 }
392 if (ret != 1) {
393 fprintf(stderr, "Error: Received %zd bytes, expected %d\n",
394 ret, 1);
395 goto end;
396 }
397 if (msg.msg_flags & MSG_CTRUNC) {
398 fprintf(stderr, "Error: Control message truncated.\n");
399 ret = -1;
400 goto end;
401 }
402 cmsg = CMSG_FIRSTHDR(&msg);
403 if (!cmsg) {
404 fprintf(stderr, "Error: Invalid control message header\n");
405 ret = -1;
406 goto end;
407 }
408 if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
409 fprintf(stderr, "Didn't received any fd\n");
410 ret = -1;
411 goto end;
412 }
413 if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
414 fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n",
415 cmsg->cmsg_len, CMSG_LEN(sizeof_fds));
416 ret = -1;
417 goto end;
418 }
419 memcpy(fds, CMSG_DATA(cmsg), sizeof_fds);
420 ret = sizeof_fds;
421 end:
422 return ret;
423 }
424
425 /*
426 * Send a message with credentials over a unix socket.
427 *
428 * Returns the size of data sent, or negative error value.
429 */
430 ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
431 {
432 struct msghdr msg;
433 struct cmsghdr *cmptr;
434 struct iovec iov[1];
435 ssize_t ret = -1;
436 struct ucred *creds;
437 size_t sizeof_cred = sizeof(struct ucred);
438 char anc_buf[CMSG_SPACE(sizeof_cred)];
439
440 memset(&msg, 0, sizeof(msg));
441
442 iov[0].iov_base = buf;
443 iov[0].iov_len = len;
444 msg.msg_iov = iov;
445 msg.msg_iovlen = 1;
446
447 msg.msg_control = (caddr_t) anc_buf;
448 msg.msg_controllen = CMSG_LEN(sizeof_cred);
449
450 cmptr = CMSG_FIRSTHDR(&msg);
451 cmptr->cmsg_level = SOL_SOCKET;
452 cmptr->cmsg_type = SCM_CREDENTIALS;
453 cmptr->cmsg_len = CMSG_LEN(sizeof_cred);
454
455 creds = (struct ucred *) CMSG_DATA(cmptr);
456
457 creds->uid = geteuid();
458 creds->gid = getegid();
459 creds->pid = getpid();
460
461 ret = sendmsg(sock, &msg, 0);
462 if (ret < 0) {
463 perror("sendmsg");
464 }
465
466 return ret;
467 }
468
469 /*
470 * Recv a message accompanied with credentials from a unix socket.
471 *
472 * Returns the size of received data, or negative error value.
473 */
474 ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
475 struct ucred *creds)
476 {
477 struct msghdr msg;
478 struct cmsghdr *cmptr;
479 struct iovec iov[1];
480 ssize_t ret;
481 size_t sizeof_cred = sizeof(struct ucred);
482 char anc_buf[CMSG_SPACE(sizeof_cred)];
483
484 memset(&msg, 0, sizeof(msg));
485
486 /* Not allowed */
487 if (creds == NULL) {
488 ret = -1;
489 goto end;
490 }
491
492 /* Prepare to receive the structures */
493 iov[0].iov_base = buf;
494 iov[0].iov_len = len;
495 msg.msg_iov = iov;
496 msg.msg_iovlen = 1;
497
498 msg.msg_control = anc_buf;
499 msg.msg_controllen = sizeof(anc_buf);
500
501 ret = recvmsg(sock, &msg, 0);
502 if (ret < 0) {
503 perror("recvmsg fds");
504 goto end;
505 }
506
507 if (msg.msg_flags & MSG_CTRUNC) {
508 fprintf(stderr, "Error: Control message truncated.\n");
509 ret = -1;
510 goto end;
511 }
512
513 cmptr = CMSG_FIRSTHDR(&msg);
514 if (cmptr == NULL) {
515 fprintf(stderr, "Error: Invalid control message header\n");
516 ret = -1;
517 goto end;
518 }
519
520 if (cmptr->cmsg_level != SOL_SOCKET ||
521 cmptr->cmsg_type != SCM_CREDENTIALS) {
522 fprintf(stderr, "Didn't received any credentials\n");
523 ret = -1;
524 goto end;
525 }
526
527 if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) {
528 fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n",
529 cmptr->cmsg_len, CMSG_LEN(sizeof_cred));
530 ret = -1;
531 goto end;
532 }
533
534 memcpy(creds, CMSG_DATA(cmptr), sizeof_cred);
535
536 end:
537 return ret;
538 }
539
540 /*
541 * Set socket option to use credentials passing.
542 */
543 int lttcomm_setsockopt_creds_unix_sock(int sock)
544 {
545 int ret, on = 1;
546
547 /* Set socket for credentials retrieval */
548 ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
549 if (ret < 0) {
550 perror("setsockopt creds unix sock");
551 }
552
553 return ret;
554 }
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