96615f4389adad78ac3804a9cd9c1b1dba7a763a
[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 <unistd.h>
28 #include <errno.h>
29
30 #include <common/defaults.h>
31 #include <common/error.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 [ LTTCOMM_ERR_INDEX(LTTCOMM_NEED_ROOT_SESSIOND) ] = "A root lttng-sessiond needs to be running, and client user part of the \"tracing\" group, to interact with kernel tracing",
120 };
121
122 /*
123 * Return ptr to string representing a human readable error code from the
124 * lttcomm_return_code enum.
125 *
126 * These code MUST be negative in other to treat that as an error value.
127 */
128 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
129 {
130 int tmp_code = -code;
131
132 if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
133 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
134 }
135
136 return "Unknown error code";
137 }
138
139 /*
140 * Connect to unix socket using the path name.
141 */
142 int lttcomm_connect_unix_sock(const char *pathname)
143 {
144 struct sockaddr_un sun;
145 int fd, ret, closeret;
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 closeret = close(fd);
172 if (closeret) {
173 PERROR("close");
174 }
175 error:
176 return ret;
177 }
178
179 /*
180 * Do an accept(2) on the sock and return the new file descriptor. The socket
181 * MUST be bind(2) before.
182 */
183 int lttcomm_accept_unix_sock(int sock)
184 {
185 int new_fd;
186 struct sockaddr_un sun;
187 socklen_t len = 0;
188
189 /* Blocking call */
190 new_fd = accept(sock, (struct sockaddr *) &sun, &len);
191 if (new_fd < 0) {
192 PERROR("accept");
193 }
194
195 return new_fd;
196 }
197
198 /*
199 * Creates a AF_UNIX local socket using pathname bind the socket upon creation
200 * and return the fd.
201 */
202 int lttcomm_create_unix_sock(const char *pathname)
203 {
204 struct sockaddr_un sun;
205 int fd;
206 int ret = -1;
207
208 /* Create server socket */
209 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
210 PERROR("socket");
211 goto error;
212 }
213
214 memset(&sun, 0, sizeof(sun));
215 sun.sun_family = AF_UNIX;
216 strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
217 sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
218
219 /* Unlink the old file if present */
220 (void) unlink(pathname);
221 ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
222 if (ret < 0) {
223 PERROR("bind");
224 goto error;
225 }
226
227 return fd;
228
229 error:
230 return ret;
231 }
232
233 /*
234 * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
235 */
236 int lttcomm_listen_unix_sock(int sock)
237 {
238 int ret;
239
240 ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN);
241 if (ret < 0) {
242 PERROR("listen");
243 }
244
245 return ret;
246 }
247
248 /*
249 * Receive data of size len in put that data into the buf param. Using recvmsg
250 * API.
251 *
252 * Return the size of received data.
253 */
254 ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
255 {
256 struct msghdr msg;
257 struct iovec iov[1];
258 ssize_t ret = -1;
259
260 memset(&msg, 0, sizeof(msg));
261
262 iov[0].iov_base = buf;
263 iov[0].iov_len = len;
264 msg.msg_iov = iov;
265 msg.msg_iovlen = 1;
266
267 ret = recvmsg(sock, &msg, MSG_WAITALL);
268 if (ret < 0) {
269 PERROR("recvmsg");
270 }
271
272 return ret;
273 }
274
275 /*
276 * Send buf data of size len. Using sendmsg API.
277 *
278 * Return the size of sent data.
279 */
280 ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
281 {
282 struct msghdr msg;
283 struct iovec iov[1];
284 ssize_t ret = -1;
285
286 memset(&msg, 0, sizeof(msg));
287
288 iov[0].iov_base = buf;
289 iov[0].iov_len = len;
290 msg.msg_iov = iov;
291 msg.msg_iovlen = 1;
292
293 ret = sendmsg(sock, &msg, 0);
294 if (ret < 0) {
295 /*
296 * Only warn about EPIPE when quiet mode is deactivated.
297 * We consider EPIPE as expected.
298 */
299 if (errno != EPIPE || !opt_quiet) {
300 PERROR("sendmsg");
301 }
302 }
303
304 return ret;
305 }
306
307 /*
308 * Shutdown cleanly a unix socket.
309 */
310 int lttcomm_close_unix_sock(int sock)
311 {
312 int ret, closeret;
313
314 /* Shutdown receptions and transmissions */
315 ret = shutdown(sock, SHUT_RDWR);
316 if (ret < 0) {
317 PERROR("shutdown");
318 }
319
320 closeret = close(sock);
321 if (closeret) {
322 PERROR("close");
323 }
324
325 return ret;
326 }
327
328 /*
329 * Send a message accompanied by fd(s) over a unix socket.
330 *
331 * Returns the size of data sent, or negative error value.
332 */
333 ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
334 {
335 struct msghdr msg;
336 struct cmsghdr *cmptr;
337 struct iovec iov[1];
338 ssize_t ret = -1;
339 unsigned int sizeof_fds = nb_fd * sizeof(int);
340 char tmp[CMSG_SPACE(sizeof_fds)];
341 char dummy = 0;
342
343 memset(&msg, 0, sizeof(msg));
344
345 if (nb_fd > LTTCOMM_MAX_SEND_FDS)
346 return -EINVAL;
347
348 msg.msg_control = (caddr_t)tmp;
349 msg.msg_controllen = CMSG_LEN(sizeof_fds);
350
351 cmptr = CMSG_FIRSTHDR(&msg);
352 cmptr->cmsg_level = SOL_SOCKET;
353 cmptr->cmsg_type = SCM_RIGHTS;
354 cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
355 memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
356 /* Sum of the length of all control messages in the buffer: */
357 msg.msg_controllen = cmptr->cmsg_len;
358
359 iov[0].iov_base = &dummy;
360 iov[0].iov_len = 1;
361 msg.msg_iov = iov;
362 msg.msg_iovlen = 1;
363
364 ret = sendmsg(sock, &msg, 0);
365 if (ret < 0) {
366 /*
367 * Only warn about EPIPE when quiet mode is deactivated.
368 * We consider EPIPE as expected.
369 */
370 if (errno != EPIPE || !opt_quiet) {
371 PERROR("sendmsg");
372 }
373 }
374 return ret;
375 }
376
377 /*
378 * Recv a message accompanied by fd(s) from a unix socket.
379 *
380 * Returns the size of received data, or negative error value.
381 *
382 * Expect at most "nb_fd" file descriptors. Returns the number of fd
383 * actually received in nb_fd.
384 */
385 ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
386 {
387 struct iovec iov[1];
388 ssize_t ret = 0;
389 struct cmsghdr *cmsg;
390 size_t sizeof_fds = nb_fd * sizeof(int);
391 char recv_fd[CMSG_SPACE(sizeof_fds)];
392 struct msghdr msg;
393 char dummy;
394
395 memset(&msg, 0, sizeof(msg));
396
397 /* Prepare to receive the structures */
398 iov[0].iov_base = &dummy;
399 iov[0].iov_len = 1;
400 msg.msg_iov = iov;
401 msg.msg_iovlen = 1;
402 msg.msg_control = recv_fd;
403 msg.msg_controllen = sizeof(recv_fd);
404
405 ret = recvmsg(sock, &msg, 0);
406 if (ret < 0) {
407 PERROR("recvmsg fds");
408 goto end;
409 }
410 if (ret != 1) {
411 fprintf(stderr, "Error: Received %zd bytes, expected %d\n",
412 ret, 1);
413 goto end;
414 }
415 if (msg.msg_flags & MSG_CTRUNC) {
416 fprintf(stderr, "Error: Control message truncated.\n");
417 ret = -1;
418 goto end;
419 }
420 cmsg = CMSG_FIRSTHDR(&msg);
421 if (!cmsg) {
422 fprintf(stderr, "Error: Invalid control message header\n");
423 ret = -1;
424 goto end;
425 }
426 if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
427 fprintf(stderr, "Didn't received any fd\n");
428 ret = -1;
429 goto end;
430 }
431 if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
432 fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n",
433 (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds));
434 ret = -1;
435 goto end;
436 }
437 memcpy(fds, CMSG_DATA(cmsg), sizeof_fds);
438 ret = sizeof_fds;
439 end:
440 return ret;
441 }
442
443 /*
444 * Send a message with credentials over a unix socket.
445 *
446 * Returns the size of data sent, or negative error value.
447 */
448 ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
449 {
450 struct msghdr msg;
451 struct iovec iov[1];
452 ssize_t ret = -1;
453 #ifdef __linux__
454 struct cmsghdr *cmptr;
455 size_t sizeof_cred = sizeof(lttng_sock_cred);
456 char anc_buf[CMSG_SPACE(sizeof_cred)];
457 lttng_sock_cred *creds;
458 #endif /* __linux__ */
459
460 memset(&msg, 0, sizeof(msg));
461
462 iov[0].iov_base = buf;
463 iov[0].iov_len = len;
464 msg.msg_iov = iov;
465 msg.msg_iovlen = 1;
466
467 #ifdef __linux__
468 msg.msg_control = (caddr_t) anc_buf;
469 msg.msg_controllen = CMSG_LEN(sizeof_cred);
470
471 cmptr = CMSG_FIRSTHDR(&msg);
472 cmptr->cmsg_level = SOL_SOCKET;
473 cmptr->cmsg_type = LTTNG_SOCK_CREDS;
474 cmptr->cmsg_len = CMSG_LEN(sizeof_cred);
475
476 creds = (lttng_sock_cred*) CMSG_DATA(cmptr);
477
478 LTTNG_SOCK_SET_UID_CRED(creds, geteuid());
479 LTTNG_SOCK_SET_GID_CRED(creds, getegid());
480 LTTNG_SOCK_SET_PID_CRED(creds, getpid());
481 #endif /* __linux__ */
482
483 ret = sendmsg(sock, &msg, 0);
484 if (ret < 0) {
485 /*
486 * Only warn about EPIPE when quiet mode is deactivated.
487 * We consider EPIPE as expected.
488 */
489 if (errno != EPIPE || !opt_quiet) {
490 PERROR("sendmsg");
491 }
492 }
493 return ret;
494 }
495
496 /*
497 * Recv a message accompanied with credentials from a unix socket.
498 *
499 * Returns the size of received data, or negative error value.
500 */
501 ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
502 lttng_sock_cred *creds)
503 {
504 struct msghdr msg;
505 struct iovec iov[1];
506 ssize_t ret;
507 #ifdef __linux__
508 struct cmsghdr *cmptr;
509 size_t sizeof_cred = sizeof(lttng_sock_cred);
510 char anc_buf[CMSG_SPACE(sizeof_cred)];
511 #endif /* __linux__ */
512
513 memset(&msg, 0, sizeof(msg));
514
515 /* Not allowed */
516 if (creds == NULL) {
517 ret = -1;
518 goto end;
519 }
520
521 /* Prepare to receive the structures */
522 iov[0].iov_base = buf;
523 iov[0].iov_len = len;
524 msg.msg_iov = iov;
525 msg.msg_iovlen = 1;
526
527 #ifdef __linux__
528 msg.msg_control = anc_buf;
529 msg.msg_controllen = sizeof(anc_buf);
530 #endif /* __linux__ */
531
532 ret = recvmsg(sock, &msg, 0);
533 if (ret < 0) {
534 PERROR("recvmsg fds");
535 goto end;
536 }
537
538 #ifdef __linux__
539 if (msg.msg_flags & MSG_CTRUNC) {
540 fprintf(stderr, "Error: Control message truncated.\n");
541 ret = -1;
542 goto end;
543 }
544
545 cmptr = CMSG_FIRSTHDR(&msg);
546 if (cmptr == NULL) {
547 fprintf(stderr, "Error: Invalid control message header\n");
548 ret = -1;
549 goto end;
550 }
551
552 if (cmptr->cmsg_level != SOL_SOCKET ||
553 cmptr->cmsg_type != LTTNG_SOCK_CREDS) {
554 fprintf(stderr, "Didn't received any credentials\n");
555 ret = -1;
556 goto end;
557 }
558
559 if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) {
560 fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n",
561 (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred));
562 ret = -1;
563 goto end;
564 }
565
566 memcpy(creds, CMSG_DATA(cmptr), sizeof_cred);
567 #elif defined(__FreeBSD__)
568 {
569 int peer_ret;
570
571 peer_ret = getpeereid(sock, &creds->uid, &creds->gid);
572 if (peer_ret != 0) {
573 return peer_ret;
574 }
575 }
576 #else
577 #error "Please implement credential support for your OS."
578 #endif /* __linux__ */
579
580 end:
581 return ret;
582 }
583
584 /*
585 * Set socket option to use credentials passing.
586 */
587 #ifdef __linux__
588 int lttcomm_setsockopt_creds_unix_sock(int sock)
589 {
590 int ret, on = 1;
591
592 /* Set socket for credentials retrieval */
593 ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
594 if (ret < 0) {
595 PERROR("setsockopt creds unix sock");
596 }
597 return ret;
598 }
599 #elif defined(__FreeBSD__)
600 int lttcomm_setsockopt_creds_unix_sock(int sock)
601 {
602 return 0;
603 }
604 #else
605 #error "Please implement credential support for your OS."
606 #endif /* __linux__ */
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