Commit | Line | Data |
---|---|---|
0d37f2bc | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
0d37f2bc | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
0d37f2bc | 6 | * |
0d37f2bc DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
0d37f2bc DG |
10 | #include <assert.h> |
11 | #include <limits.h> | |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/stat.h> | |
16 | #include <sys/types.h> | |
17 | #include <unistd.h> | |
18 | #include <errno.h> | |
19 | ||
90e535ef | 20 | #include <common/common.h> |
2038dd6c | 21 | #include <common/sessiond-comm/sessiond-comm.h> |
0d37f2bc DG |
22 | |
23 | #include "unix.h" | |
24 | ||
25 | /* | |
26 | * Connect to unix socket using the path name. | |
27 | */ | |
90e535ef | 28 | LTTNG_HIDDEN |
0d37f2bc DG |
29 | int lttcomm_connect_unix_sock(const char *pathname) |
30 | { | |
665886a6 | 31 | struct sockaddr_un s_un; |
0d37f2bc DG |
32 | int fd, ret, closeret; |
33 | ||
7f8bf467 JG |
34 | if (strlen(pathname) >= sizeof(s_un.sun_path)) { |
35 | ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).", | |
36 | pathname, strlen(pathname) + 1, | |
37 | sizeof(s_un.sun_path)); | |
38 | ret = -ENAMETOOLONG; | |
39 | goto error; | |
40 | } | |
41 | ||
0d37f2bc DG |
42 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
43 | if (fd < 0) { | |
44 | PERROR("socket"); | |
45 | ret = fd; | |
46 | goto error; | |
47 | } | |
48 | ||
665886a6 MJ |
49 | memset(&s_un, 0, sizeof(s_un)); |
50 | s_un.sun_family = AF_UNIX; | |
51 | strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path)); | |
52 | s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0'; | |
0d37f2bc | 53 | |
665886a6 | 54 | ret = connect(fd, (struct sockaddr *) &s_un, sizeof(s_un)); |
0d37f2bc DG |
55 | if (ret < 0) { |
56 | /* | |
57 | * Don't print message on connect error, because connect is used in | |
58 | * normal execution to detect if sessiond is alive. | |
59 | */ | |
60 | goto error_connect; | |
61 | } | |
62 | ||
63 | return fd; | |
64 | ||
65 | error_connect: | |
66 | closeret = close(fd); | |
67 | if (closeret) { | |
68 | PERROR("close"); | |
69 | } | |
70 | error: | |
71 | return ret; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Do an accept(2) on the sock and return the new file descriptor. The socket | |
76 | * MUST be bind(2) before. | |
77 | */ | |
90e535ef | 78 | LTTNG_HIDDEN |
0d37f2bc DG |
79 | int lttcomm_accept_unix_sock(int sock) |
80 | { | |
81 | int new_fd; | |
665886a6 | 82 | struct sockaddr_un s_un; |
50786a72 | 83 | socklen_t len = sizeof(s_un); |
0d37f2bc DG |
84 | |
85 | /* Blocking call */ | |
665886a6 | 86 | new_fd = accept(sock, (struct sockaddr *) &s_un, &len); |
0d37f2bc DG |
87 | if (new_fd < 0) { |
88 | PERROR("accept"); | |
89 | } | |
90 | ||
91 | return new_fd; | |
92 | } | |
93 | ||
7567352f MD |
94 | LTTNG_HIDDEN |
95 | int lttcomm_create_anon_unix_socketpair(int *fds) | |
96 | { | |
97 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, fds) < 0) { | |
98 | PERROR("socketpair"); | |
99 | return -1; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
0d37f2bc DG |
104 | /* |
105 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation | |
106 | * and return the fd. | |
107 | */ | |
90e535ef | 108 | LTTNG_HIDDEN |
0d37f2bc DG |
109 | int lttcomm_create_unix_sock(const char *pathname) |
110 | { | |
665886a6 | 111 | struct sockaddr_un s_un; |
7f8bf467 | 112 | int fd = -1; |
0d37f2bc DG |
113 | int ret = -1; |
114 | ||
7f8bf467 JG |
115 | if (strlen(pathname) >= sizeof(s_un.sun_path)) { |
116 | ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).", | |
117 | pathname, strlen(pathname) + 1, | |
118 | sizeof(s_un.sun_path)); | |
119 | ret = -ENAMETOOLONG; | |
120 | goto error; | |
121 | } | |
122 | ||
0d37f2bc DG |
123 | /* Create server socket */ |
124 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
125 | PERROR("socket"); | |
126 | goto error; | |
127 | } | |
128 | ||
665886a6 MJ |
129 | memset(&s_un, 0, sizeof(s_un)); |
130 | s_un.sun_family = AF_UNIX; | |
131 | strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path)); | |
132 | s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0'; | |
0d37f2bc DG |
133 | |
134 | /* Unlink the old file if present */ | |
135 | (void) unlink(pathname); | |
665886a6 | 136 | ret = bind(fd, (struct sockaddr *) &s_un, sizeof(s_un)); |
0d37f2bc DG |
137 | if (ret < 0) { |
138 | PERROR("bind"); | |
139 | goto error; | |
140 | } | |
141 | ||
142 | return fd; | |
143 | ||
144 | error: | |
17e75273 DG |
145 | if (fd >= 0) { |
146 | if (close(fd) < 0) { | |
147 | PERROR("close create unix sock"); | |
148 | } | |
149 | } | |
0d37f2bc DG |
150 | return ret; |
151 | } | |
152 | ||
153 | /* | |
154 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
155 | */ | |
90e535ef | 156 | LTTNG_HIDDEN |
0d37f2bc DG |
157 | int lttcomm_listen_unix_sock(int sock) |
158 | { | |
159 | int ret; | |
160 | ||
161 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); | |
162 | if (ret < 0) { | |
163 | PERROR("listen"); | |
164 | } | |
165 | ||
166 | return ret; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
171 | * API. | |
172 | * | |
173 | * Return the size of received data. | |
174 | */ | |
90e535ef | 175 | LTTNG_HIDDEN |
0d37f2bc DG |
176 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) |
177 | { | |
178 | struct msghdr msg; | |
179 | struct iovec iov[1]; | |
180 | ssize_t ret = -1; | |
7c5aef62 | 181 | size_t len_last; |
0d37f2bc DG |
182 | |
183 | memset(&msg, 0, sizeof(msg)); | |
184 | ||
185 | iov[0].iov_base = buf; | |
186 | iov[0].iov_len = len; | |
187 | msg.msg_iov = iov; | |
188 | msg.msg_iovlen = 1; | |
189 | ||
190 | do { | |
7c5aef62 | 191 | len_last = iov[0].iov_len; |
fbb1fd3a | 192 | ret = lttng_recvmsg_nosigpipe(sock, &msg); |
7c5aef62 DG |
193 | if (ret > 0) { |
194 | iov[0].iov_base += ret; | |
195 | iov[0].iov_len -= ret; | |
196 | assert(ret <= len_last); | |
197 | } | |
198 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
0d37f2bc DG |
199 | if (ret < 0) { |
200 | PERROR("recvmsg"); | |
7c5aef62 DG |
201 | } else if (ret > 0) { |
202 | ret = len; | |
0d37f2bc | 203 | } |
7c5aef62 | 204 | /* Else ret = 0 meaning an orderly shutdown. */ |
0d37f2bc DG |
205 | |
206 | return ret; | |
207 | } | |
208 | ||
c72435ad JG |
209 | /* |
210 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
211 | * API. Only use with sockets set in non-blocking mode. | |
212 | * | |
213 | * Return the size of received data. | |
214 | */ | |
215 | LTTNG_HIDDEN | |
216 | ssize_t lttcomm_recv_unix_sock_non_block(int sock, void *buf, size_t len) | |
217 | { | |
218 | struct msghdr msg; | |
219 | struct iovec iov[1]; | |
220 | ssize_t ret; | |
221 | ||
222 | memset(&msg, 0, sizeof(msg)); | |
223 | ||
224 | iov[0].iov_base = buf; | |
225 | iov[0].iov_len = len; | |
226 | msg.msg_iov = iov; | |
227 | msg.msg_iovlen = 1; | |
228 | ||
229 | retry: | |
230 | ret = lttng_recvmsg_nosigpipe(sock, &msg); | |
231 | if (ret < 0) { | |
232 | if (errno == EINTR) { | |
233 | goto retry; | |
234 | } else { | |
55e2fc33 JG |
235 | /* We consider EPIPE and EAGAIN as expected. */ |
236 | if (!lttng_opt_quiet && | |
237 | (errno != EPIPE && errno != EAGAIN)) { | |
c72435ad JG |
238 | PERROR("recvmsg"); |
239 | } | |
240 | goto end; | |
241 | } | |
242 | } | |
243 | ret = len; | |
244 | end: | |
245 | return ret; | |
246 | } | |
247 | ||
0d37f2bc DG |
248 | /* |
249 | * Send buf data of size len. Using sendmsg API. | |
250 | * | |
251 | * Return the size of sent data. | |
252 | */ | |
90e535ef | 253 | LTTNG_HIDDEN |
c2d69327 | 254 | ssize_t lttcomm_send_unix_sock(int sock, const void *buf, size_t len) |
0d37f2bc DG |
255 | { |
256 | struct msghdr msg; | |
257 | struct iovec iov[1]; | |
c72435ad | 258 | ssize_t ret; |
0d37f2bc DG |
259 | |
260 | memset(&msg, 0, sizeof(msg)); | |
261 | ||
c2d69327 | 262 | iov[0].iov_base = (void *) buf; |
0d37f2bc DG |
263 | iov[0].iov_len = len; |
264 | msg.msg_iov = iov; | |
265 | msg.msg_iovlen = 1; | |
266 | ||
c72435ad JG |
267 | while (iov[0].iov_len) { |
268 | ret = sendmsg(sock, &msg, 0); | |
269 | if (ret < 0) { | |
270 | if (errno == EINTR) { | |
271 | continue; | |
272 | } else { | |
273 | /* | |
274 | * Only warn about EPIPE when quiet mode is | |
275 | * deactivated. | |
276 | * We consider EPIPE as expected. | |
277 | */ | |
278 | if (errno != EPIPE || !lttng_opt_quiet) { | |
279 | PERROR("sendmsg"); | |
280 | } | |
281 | goto end; | |
282 | } | |
283 | } | |
284 | iov[0].iov_len -= ret; | |
285 | iov[0].iov_base += ret; | |
286 | } | |
287 | ret = len; | |
288 | end: | |
289 | return ret; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Send buf data of size len. Using sendmsg API. | |
294 | * Only use with non-blocking sockets. The difference with the blocking version | |
295 | * of the function is that this one does not retry to send on partial sends, | |
296 | * except if the interruption was caused by a signal (EINTR). | |
297 | * | |
298 | * Return the size of sent data. | |
299 | */ | |
300 | LTTNG_HIDDEN | |
301 | ssize_t lttcomm_send_unix_sock_non_block(int sock, const void *buf, size_t len) | |
302 | { | |
303 | struct msghdr msg; | |
304 | struct iovec iov[1]; | |
305 | ssize_t ret; | |
306 | ||
307 | memset(&msg, 0, sizeof(msg)); | |
308 | ||
309 | iov[0].iov_base = (void *) buf; | |
310 | iov[0].iov_len = len; | |
311 | msg.msg_iov = iov; | |
312 | msg.msg_iovlen = 1; | |
313 | ||
314 | retry: | |
0d37f2bc DG |
315 | ret = sendmsg(sock, &msg, 0); |
316 | if (ret < 0) { | |
c72435ad JG |
317 | if (errno == EINTR) { |
318 | goto retry; | |
319 | } else { | |
55e2fc33 JG |
320 | /* We consider EPIPE and EAGAIN as expected. */ |
321 | if (!lttng_opt_quiet && | |
322 | (errno != EPIPE && errno != EAGAIN)) { | |
c72435ad JG |
323 | PERROR("sendmsg"); |
324 | } | |
325 | goto end; | |
0d37f2bc DG |
326 | } |
327 | } | |
c72435ad JG |
328 | ret = len; |
329 | end: | |
0d37f2bc DG |
330 | return ret; |
331 | } | |
332 | ||
333 | /* | |
334 | * Shutdown cleanly a unix socket. | |
335 | */ | |
90e535ef | 336 | LTTNG_HIDDEN |
0d37f2bc DG |
337 | int lttcomm_close_unix_sock(int sock) |
338 | { | |
339 | int ret, closeret; | |
340 | ||
341 | /* Shutdown receptions and transmissions */ | |
342 | ret = shutdown(sock, SHUT_RDWR); | |
343 | if (ret < 0) { | |
344 | PERROR("shutdown"); | |
345 | } | |
346 | ||
347 | closeret = close(sock); | |
348 | if (closeret) { | |
349 | PERROR("close"); | |
350 | } | |
351 | ||
352 | return ret; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Send a message accompanied by fd(s) over a unix socket. | |
357 | * | |
358 | * Returns the size of data sent, or negative error value. | |
359 | */ | |
90e535ef | 360 | LTTNG_HIDDEN |
ac2f30af | 361 | ssize_t lttcomm_send_fds_unix_sock(int sock, const int *fds, size_t nb_fd) |
0d37f2bc DG |
362 | { |
363 | struct msghdr msg; | |
364 | struct cmsghdr *cmptr; | |
365 | struct iovec iov[1]; | |
366 | ssize_t ret = -1; | |
367 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
368 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
369 | char dummy = 0; | |
370 | ||
371 | memset(&msg, 0, sizeof(msg)); | |
b3f35e02 | 372 | memset(tmp, 0, sizeof(tmp)); |
0d37f2bc DG |
373 | |
374 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) | |
375 | return -EINVAL; | |
376 | ||
377 | msg.msg_control = (caddr_t)tmp; | |
378 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
379 | ||
380 | cmptr = CMSG_FIRSTHDR(&msg); | |
1d8d0328 MJ |
381 | if (!cmptr) { |
382 | return -1; | |
383 | } | |
b3f35e02 | 384 | |
0d37f2bc DG |
385 | cmptr->cmsg_level = SOL_SOCKET; |
386 | cmptr->cmsg_type = SCM_RIGHTS; | |
387 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); | |
388 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); | |
389 | /* Sum of the length of all control messages in the buffer: */ | |
390 | msg.msg_controllen = cmptr->cmsg_len; | |
391 | ||
392 | iov[0].iov_base = &dummy; | |
393 | iov[0].iov_len = 1; | |
394 | msg.msg_iov = iov; | |
395 | msg.msg_iovlen = 1; | |
396 | ||
397 | do { | |
398 | ret = sendmsg(sock, &msg, 0); | |
399 | } while (ret < 0 && errno == EINTR); | |
400 | if (ret < 0) { | |
401 | /* | |
402 | * Only warn about EPIPE when quiet mode is deactivated. | |
403 | * We consider EPIPE as expected. | |
404 | */ | |
405 | if (errno != EPIPE || !lttng_opt_quiet) { | |
406 | PERROR("sendmsg"); | |
407 | } | |
408 | } | |
409 | return ret; | |
410 | } | |
411 | ||
412 | /* | |
413 | * Recv a message accompanied by fd(s) from a unix socket. | |
414 | * | |
415 | * Returns the size of received data, or negative error value. | |
416 | * | |
417 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
418 | * actually received in nb_fd. | |
419 | */ | |
90e535ef | 420 | LTTNG_HIDDEN |
0d37f2bc DG |
421 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) |
422 | { | |
423 | struct iovec iov[1]; | |
424 | ssize_t ret = 0; | |
425 | struct cmsghdr *cmsg; | |
426 | size_t sizeof_fds = nb_fd * sizeof(int); | |
b3f35e02 | 427 | |
ba49ae8c MJ |
428 | #ifdef __linux__ |
429 | /* Account for the struct ucred cmsg in the buffer size */ | |
430 | #define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds) + CMSG_SPACE(sizeof(struct ucred)) | |
431 | #else | |
432 | #define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds) | |
433 | #endif /* __linux__ */ | |
434 | ||
435 | char recv_buf[LTTNG_SOCK_RECV_FDS_BUF_SIZE]; | |
0d37f2bc DG |
436 | struct msghdr msg; |
437 | char dummy; | |
438 | ||
439 | memset(&msg, 0, sizeof(msg)); | |
440 | ||
441 | /* Prepare to receive the structures */ | |
442 | iov[0].iov_base = &dummy; | |
443 | iov[0].iov_len = 1; | |
444 | msg.msg_iov = iov; | |
445 | msg.msg_iovlen = 1; | |
b3f35e02 FD |
446 | |
447 | cmsg = (struct cmsghdr *) recv_buf; | |
448 | cmsg->cmsg_len = CMSG_LEN(sizeof_fds); | |
449 | cmsg->cmsg_level = SOL_SOCKET; | |
450 | cmsg->cmsg_type = SCM_RIGHTS; | |
451 | ||
452 | msg.msg_control = cmsg; | |
453 | msg.msg_controllen = CMSG_LEN(sizeof(recv_buf)); | |
454 | msg.msg_flags = 0; | |
0d37f2bc DG |
455 | |
456 | do { | |
457 | ret = recvmsg(sock, &msg, 0); | |
458 | } while (ret < 0 && errno == EINTR); | |
459 | if (ret < 0) { | |
460 | PERROR("recvmsg fds"); | |
461 | goto end; | |
462 | } | |
b3f35e02 | 463 | |
0d37f2bc DG |
464 | if (ret != 1) { |
465 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
466 | ret, 1); | |
467 | goto end; | |
468 | } | |
b3f35e02 | 469 | |
0d37f2bc DG |
470 | if (msg.msg_flags & MSG_CTRUNC) { |
471 | fprintf(stderr, "Error: Control message truncated.\n"); | |
472 | ret = -1; | |
473 | goto end; | |
474 | } | |
b3f35e02 FD |
475 | |
476 | /* | |
477 | * If the socket was configured with SO_PASSCRED, the kernel will add a | |
478 | * control message (cmsg) to the ancillary data of the unix socket. We | |
479 | * need to expect a cmsg of the SCM_CREDENTIALS as the first control | |
480 | * message. | |
481 | */ | |
482 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { | |
b3f35e02 FD |
483 | if (cmsg->cmsg_level != SOL_SOCKET) { |
484 | fprintf(stderr, "Error: The socket needs to be of type SOL_SOCKET\n"); | |
485 | ret = -1; | |
486 | goto end; | |
487 | } | |
488 | if (cmsg->cmsg_type == SCM_RIGHTS) { | |
489 | /* | |
490 | * We found the controle message for file descriptors, | |
491 | * now copy the fds to the fds ptr and return success. | |
492 | */ | |
493 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { | |
494 | fprintf(stderr, "Error: Received %zu bytes of" | |
495 | "ancillary data for FDs, expected %zu\n", | |
496 | (size_t) cmsg->cmsg_len, | |
497 | (size_t) CMSG_LEN(sizeof_fds)); | |
498 | ret = -1; | |
499 | goto end; | |
500 | } | |
501 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); | |
502 | ret = sizeof_fds; | |
503 | goto end; | |
504 | } | |
ba49ae8c | 505 | #ifdef __linux__ |
b3f35e02 FD |
506 | if (cmsg->cmsg_type == SCM_CREDENTIALS) { |
507 | /* | |
508 | * Expect credentials to be sent when expecting fds even | |
509 | * if no credential were include in the send(). The | |
510 | * kernel adds them... | |
511 | */ | |
b3f35e02 FD |
512 | ret = -1; |
513 | } | |
ba49ae8c | 514 | #endif /* __linux__ */ |
0d37f2bc | 515 | } |
0d37f2bc DG |
516 | end: |
517 | return ret; | |
518 | } | |
519 | ||
520 | /* | |
521 | * Send a message with credentials over a unix socket. | |
522 | * | |
523 | * Returns the size of data sent, or negative error value. | |
524 | */ | |
90e535ef | 525 | LTTNG_HIDDEN |
0d37f2bc DG |
526 | ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len) |
527 | { | |
528 | struct msghdr msg; | |
529 | struct iovec iov[1]; | |
530 | ssize_t ret = -1; | |
531 | #ifdef __linux__ | |
532 | struct cmsghdr *cmptr; | |
533 | size_t sizeof_cred = sizeof(lttng_sock_cred); | |
534 | char anc_buf[CMSG_SPACE(sizeof_cred)]; | |
535 | lttng_sock_cred *creds; | |
8bbffd54 MJ |
536 | |
537 | memset(anc_buf, 0, CMSG_SPACE(sizeof_cred) * sizeof(char)); | |
0d37f2bc DG |
538 | #endif /* __linux__ */ |
539 | ||
540 | memset(&msg, 0, sizeof(msg)); | |
541 | ||
542 | iov[0].iov_base = buf; | |
543 | iov[0].iov_len = len; | |
544 | msg.msg_iov = iov; | |
545 | msg.msg_iovlen = 1; | |
546 | ||
547 | #ifdef __linux__ | |
548 | msg.msg_control = (caddr_t) anc_buf; | |
549 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
550 | ||
551 | cmptr = CMSG_FIRSTHDR(&msg); | |
1d8d0328 MJ |
552 | if (!cmptr) { |
553 | return -1; | |
554 | } | |
0d37f2bc DG |
555 | cmptr->cmsg_level = SOL_SOCKET; |
556 | cmptr->cmsg_type = LTTNG_SOCK_CREDS; | |
557 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); | |
558 | ||
559 | creds = (lttng_sock_cred*) CMSG_DATA(cmptr); | |
560 | ||
561 | LTTNG_SOCK_SET_UID_CRED(creds, geteuid()); | |
562 | LTTNG_SOCK_SET_GID_CRED(creds, getegid()); | |
563 | LTTNG_SOCK_SET_PID_CRED(creds, getpid()); | |
564 | #endif /* __linux__ */ | |
565 | ||
566 | do { | |
567 | ret = sendmsg(sock, &msg, 0); | |
568 | } while (ret < 0 && errno == EINTR); | |
569 | if (ret < 0) { | |
570 | /* | |
571 | * Only warn about EPIPE when quiet mode is deactivated. | |
572 | * We consider EPIPE as expected. | |
573 | */ | |
574 | if (errno != EPIPE || !lttng_opt_quiet) { | |
575 | PERROR("sendmsg"); | |
576 | } | |
577 | } | |
578 | return ret; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Recv a message accompanied with credentials from a unix socket. | |
583 | * | |
584 | * Returns the size of received data, or negative error value. | |
585 | */ | |
90e535ef | 586 | LTTNG_HIDDEN |
0d37f2bc DG |
587 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, |
588 | lttng_sock_cred *creds) | |
589 | { | |
590 | struct msghdr msg; | |
591 | struct iovec iov[1]; | |
592 | ssize_t ret; | |
4100e49a | 593 | size_t len_last; |
0d37f2bc DG |
594 | #ifdef __linux__ |
595 | struct cmsghdr *cmptr; | |
596 | size_t sizeof_cred = sizeof(lttng_sock_cred); | |
597 | char anc_buf[CMSG_SPACE(sizeof_cred)]; | |
598 | #endif /* __linux__ */ | |
599 | ||
600 | memset(&msg, 0, sizeof(msg)); | |
601 | ||
602 | /* Not allowed */ | |
603 | if (creds == NULL) { | |
604 | ret = -1; | |
605 | goto end; | |
606 | } | |
607 | ||
608 | /* Prepare to receive the structures */ | |
609 | iov[0].iov_base = buf; | |
610 | iov[0].iov_len = len; | |
611 | msg.msg_iov = iov; | |
612 | msg.msg_iovlen = 1; | |
613 | ||
614 | #ifdef __linux__ | |
615 | msg.msg_control = anc_buf; | |
616 | msg.msg_controllen = sizeof(anc_buf); | |
617 | #endif /* __linux__ */ | |
618 | ||
619 | do { | |
4100e49a | 620 | len_last = iov[0].iov_len; |
0d37f2bc | 621 | ret = recvmsg(sock, &msg, 0); |
4100e49a DG |
622 | if (ret > 0) { |
623 | iov[0].iov_base += ret; | |
624 | iov[0].iov_len -= ret; | |
625 | assert(ret <= len_last); | |
626 | } | |
627 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
0d37f2bc DG |
628 | if (ret < 0) { |
629 | PERROR("recvmsg fds"); | |
630 | goto end; | |
4100e49a DG |
631 | } else if (ret > 0) { |
632 | ret = len; | |
0d37f2bc | 633 | } |
4100e49a | 634 | /* Else ret = 0 meaning an orderly shutdown. */ |
0d37f2bc DG |
635 | |
636 | #ifdef __linux__ | |
637 | if (msg.msg_flags & MSG_CTRUNC) { | |
638 | fprintf(stderr, "Error: Control message truncated.\n"); | |
639 | ret = -1; | |
640 | goto end; | |
641 | } | |
642 | ||
643 | cmptr = CMSG_FIRSTHDR(&msg); | |
644 | if (cmptr == NULL) { | |
645 | fprintf(stderr, "Error: Invalid control message header\n"); | |
646 | ret = -1; | |
647 | goto end; | |
648 | } | |
649 | ||
650 | if (cmptr->cmsg_level != SOL_SOCKET || | |
651 | cmptr->cmsg_type != LTTNG_SOCK_CREDS) { | |
652 | fprintf(stderr, "Didn't received any credentials\n"); | |
653 | ret = -1; | |
654 | goto end; | |
655 | } | |
656 | ||
657 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
658 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
659 | (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred)); | |
660 | ret = -1; | |
661 | goto end; | |
662 | } | |
663 | ||
664 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
bfa419e4 | 665 | #elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__) || defined(__APPLE__)) |
0d37f2bc DG |
666 | { |
667 | int peer_ret; | |
668 | ||
669 | peer_ret = getpeereid(sock, &creds->uid, &creds->gid); | |
670 | if (peer_ret != 0) { | |
671 | return peer_ret; | |
672 | } | |
673 | } | |
674 | #else | |
675 | #error "Please implement credential support for your OS." | |
676 | #endif /* __linux__ */ | |
677 | ||
678 | end: | |
679 | return ret; | |
680 | } | |
681 | ||
682 | /* | |
683 | * Set socket option to use credentials passing. | |
684 | */ | |
685 | #ifdef __linux__ | |
90e535ef | 686 | LTTNG_HIDDEN |
0d37f2bc DG |
687 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
688 | { | |
689 | int ret, on = 1; | |
690 | ||
691 | /* Set socket for credentials retrieval */ | |
692 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
693 | if (ret < 0) { | |
694 | PERROR("setsockopt creds unix sock"); | |
695 | } | |
696 | return ret; | |
697 | } | |
bfa419e4 | 698 | #elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__) || defined(__APPLE__)) |
90e535ef | 699 | LTTNG_HIDDEN |
0d37f2bc DG |
700 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
701 | { | |
702 | return 0; | |
703 | } | |
704 | #else | |
705 | #error "Please implement credential support for your OS." | |
706 | #endif /* __linux__ */ |