Commit | Line | Data |
---|---|---|
0d37f2bc | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa | 3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
0d37f2bc | 4 | * |
c922647d | 5 | * SPDX-License-Identifier: LGPL-2.1-only |
0d37f2bc | 6 | * |
0d37f2bc DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
0d37f2bc DG |
10 | #include <limits.h> |
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | #include <sys/stat.h> | |
15 | #include <sys/types.h> | |
16 | #include <unistd.h> | |
0d37f2bc | 17 | |
c9e313bc SM |
18 | #include <common/common.hpp> |
19 | #include <common/compat/errno.hpp> | |
20 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
21 | #include <common/fd-handle.hpp> | |
0d37f2bc | 22 | |
c9e313bc | 23 | #include "unix.hpp" |
0d37f2bc DG |
24 | |
25 | /* | |
26 | * Connect to unix socket using the path name. | |
27 | */ | |
28 | int lttcomm_connect_unix_sock(const char *pathname) | |
29 | { | |
665886a6 | 30 | struct sockaddr_un s_un; |
0d37f2bc DG |
31 | int fd, ret, closeret; |
32 | ||
7f8bf467 JG |
33 | if (strlen(pathname) >= sizeof(s_un.sun_path)) { |
34 | ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).", | |
35 | pathname, strlen(pathname) + 1, | |
36 | sizeof(s_un.sun_path)); | |
37 | ret = -ENAMETOOLONG; | |
38 | goto error; | |
39 | } | |
40 | ||
0d37f2bc DG |
41 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
42 | if (fd < 0) { | |
43 | PERROR("socket"); | |
44 | ret = fd; | |
45 | goto error; | |
46 | } | |
47 | ||
665886a6 MJ |
48 | memset(&s_un, 0, sizeof(s_un)); |
49 | s_un.sun_family = AF_UNIX; | |
50 | strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path)); | |
51 | s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0'; | |
0d37f2bc | 52 | |
665886a6 | 53 | ret = connect(fd, (struct sockaddr *) &s_un, sizeof(s_un)); |
0d37f2bc DG |
54 | if (ret < 0) { |
55 | /* | |
56 | * Don't print message on connect error, because connect is used in | |
57 | * normal execution to detect if sessiond is alive. | |
58 | */ | |
59 | goto error_connect; | |
60 | } | |
61 | ||
62 | return fd; | |
63 | ||
64 | error_connect: | |
65 | closeret = close(fd); | |
66 | if (closeret) { | |
67 | PERROR("close"); | |
68 | } | |
69 | error: | |
70 | return ret; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Do an accept(2) on the sock and return the new file descriptor. The socket | |
75 | * MUST be bind(2) before. | |
76 | */ | |
77 | int lttcomm_accept_unix_sock(int sock) | |
78 | { | |
79 | int new_fd; | |
665886a6 | 80 | struct sockaddr_un s_un; |
50786a72 | 81 | socklen_t len = sizeof(s_un); |
0d37f2bc DG |
82 | |
83 | /* Blocking call */ | |
665886a6 | 84 | new_fd = accept(sock, (struct sockaddr *) &s_un, &len); |
0d37f2bc DG |
85 | if (new_fd < 0) { |
86 | PERROR("accept"); | |
87 | } | |
88 | ||
89 | return new_fd; | |
90 | } | |
91 | ||
7567352f MD |
92 | int lttcomm_create_anon_unix_socketpair(int *fds) |
93 | { | |
94 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, fds) < 0) { | |
95 | PERROR("socketpair"); | |
96 | return -1; | |
97 | } | |
98 | return 0; | |
99 | } | |
100 | ||
0d37f2bc DG |
101 | /* |
102 | * Creates a AF_UNIX local socket using pathname bind the socket upon creation | |
103 | * and return the fd. | |
104 | */ | |
105 | int lttcomm_create_unix_sock(const char *pathname) | |
106 | { | |
665886a6 | 107 | struct sockaddr_un s_un; |
7f8bf467 | 108 | int fd = -1; |
0d37f2bc DG |
109 | int ret = -1; |
110 | ||
7f8bf467 JG |
111 | if (strlen(pathname) >= sizeof(s_un.sun_path)) { |
112 | ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).", | |
113 | pathname, strlen(pathname) + 1, | |
114 | sizeof(s_un.sun_path)); | |
115 | ret = -ENAMETOOLONG; | |
116 | goto error; | |
117 | } | |
118 | ||
0d37f2bc DG |
119 | /* Create server socket */ |
120 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { | |
121 | PERROR("socket"); | |
122 | goto error; | |
123 | } | |
124 | ||
665886a6 MJ |
125 | memset(&s_un, 0, sizeof(s_un)); |
126 | s_un.sun_family = AF_UNIX; | |
127 | strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path)); | |
128 | s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0'; | |
0d37f2bc DG |
129 | |
130 | /* Unlink the old file if present */ | |
131 | (void) unlink(pathname); | |
665886a6 | 132 | ret = bind(fd, (struct sockaddr *) &s_un, sizeof(s_un)); |
0d37f2bc DG |
133 | if (ret < 0) { |
134 | PERROR("bind"); | |
135 | goto error; | |
136 | } | |
137 | ||
138 | return fd; | |
139 | ||
140 | error: | |
17e75273 DG |
141 | if (fd >= 0) { |
142 | if (close(fd) < 0) { | |
143 | PERROR("close create unix sock"); | |
144 | } | |
145 | } | |
0d37f2bc DG |
146 | return ret; |
147 | } | |
148 | ||
149 | /* | |
150 | * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. | |
151 | */ | |
152 | int lttcomm_listen_unix_sock(int sock) | |
153 | { | |
154 | int ret; | |
155 | ||
156 | ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); | |
157 | if (ret < 0) { | |
158 | PERROR("listen"); | |
159 | } | |
160 | ||
161 | return ret; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
166 | * API. | |
167 | * | |
168 | * Return the size of received data. | |
169 | */ | |
170 | ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) | |
171 | { | |
172 | struct msghdr msg; | |
173 | struct iovec iov[1]; | |
174 | ssize_t ret = -1; | |
7c5aef62 | 175 | size_t len_last; |
0d37f2bc | 176 | |
a0377dfe FD |
177 | LTTNG_ASSERT(sock); |
178 | LTTNG_ASSERT(buf); | |
179 | LTTNG_ASSERT(len > 0); | |
982583bd | 180 | |
0d37f2bc DG |
181 | memset(&msg, 0, sizeof(msg)); |
182 | ||
183 | iov[0].iov_base = buf; | |
184 | iov[0].iov_len = len; | |
185 | msg.msg_iov = iov; | |
186 | msg.msg_iovlen = 1; | |
187 | ||
188 | do { | |
7c5aef62 | 189 | len_last = iov[0].iov_len; |
fbb1fd3a | 190 | ret = lttng_recvmsg_nosigpipe(sock, &msg); |
7c5aef62 | 191 | if (ret > 0) { |
a6bc4ca9 | 192 | iov[0].iov_base = (char *) iov[0].iov_base + ret; |
7c5aef62 | 193 | iov[0].iov_len -= ret; |
a0377dfe | 194 | LTTNG_ASSERT(ret <= len_last); |
7c5aef62 DG |
195 | } |
196 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
0d37f2bc DG |
197 | if (ret < 0) { |
198 | PERROR("recvmsg"); | |
7c5aef62 DG |
199 | } else if (ret > 0) { |
200 | ret = len; | |
0d37f2bc | 201 | } |
7c5aef62 | 202 | /* Else ret = 0 meaning an orderly shutdown. */ |
0d37f2bc DG |
203 | |
204 | return ret; | |
205 | } | |
206 | ||
c72435ad JG |
207 | /* |
208 | * Receive data of size len in put that data into the buf param. Using recvmsg | |
209 | * API. Only use with sockets set in non-blocking mode. | |
210 | * | |
44c180ca JR |
211 | * NOTE: EPIPE errors are NOT reported. This call expects the socket to be in a |
212 | * poll set. The poll loop will handle the EPIPE original cause. | |
213 | * | |
c72435ad JG |
214 | * Return the size of received data. |
215 | */ | |
c72435ad JG |
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 | ||
a0377dfe FD |
222 | LTTNG_ASSERT(sock); |
223 | LTTNG_ASSERT(buf); | |
224 | LTTNG_ASSERT(len > 0); | |
982583bd | 225 | |
c72435ad JG |
226 | memset(&msg, 0, sizeof(msg)); |
227 | ||
228 | iov[0].iov_base = buf; | |
229 | iov[0].iov_len = len; | |
230 | msg.msg_iov = iov; | |
231 | msg.msg_iovlen = 1; | |
232 | ||
233 | retry: | |
234 | ret = lttng_recvmsg_nosigpipe(sock, &msg); | |
235 | if (ret < 0) { | |
236 | if (errno == EINTR) { | |
237 | goto retry; | |
238 | } else { | |
44c180ca JR |
239 | /* |
240 | * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected. | |
241 | */ | |
942003e5 MJ |
242 | DIAGNOSTIC_PUSH |
243 | DIAGNOSTIC_IGNORE_LOGICAL_OP | |
44c180ca JR |
244 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
245 | errno == EPIPE) { | |
942003e5 | 246 | DIAGNOSTIC_POP |
44c180ca JR |
247 | /* |
248 | * Nothing was recv. | |
249 | */ | |
250 | ret = 0; | |
251 | goto end; | |
c72435ad | 252 | } |
44c180ca JR |
253 | |
254 | /* Unexpected error */ | |
255 | PERROR("recvmsg"); | |
256 | ret = -1; | |
c72435ad JG |
257 | goto end; |
258 | } | |
259 | } | |
5b86bd5e | 260 | |
c72435ad JG |
261 | end: |
262 | return ret; | |
263 | } | |
264 | ||
0d37f2bc DG |
265 | /* |
266 | * Send buf data of size len. Using sendmsg API. | |
267 | * | |
268 | * Return the size of sent data. | |
269 | */ | |
c2d69327 | 270 | ssize_t lttcomm_send_unix_sock(int sock, const void *buf, size_t len) |
0d37f2bc DG |
271 | { |
272 | struct msghdr msg; | |
273 | struct iovec iov[1]; | |
c72435ad | 274 | ssize_t ret; |
0d37f2bc | 275 | |
a0377dfe FD |
276 | LTTNG_ASSERT(sock); |
277 | LTTNG_ASSERT(buf); | |
278 | LTTNG_ASSERT(len > 0); | |
982583bd | 279 | |
0d37f2bc DG |
280 | memset(&msg, 0, sizeof(msg)); |
281 | ||
c2d69327 | 282 | iov[0].iov_base = (void *) buf; |
0d37f2bc DG |
283 | iov[0].iov_len = len; |
284 | msg.msg_iov = iov; | |
285 | msg.msg_iovlen = 1; | |
286 | ||
c72435ad JG |
287 | while (iov[0].iov_len) { |
288 | ret = sendmsg(sock, &msg, 0); | |
289 | if (ret < 0) { | |
290 | if (errno == EINTR) { | |
291 | continue; | |
292 | } else { | |
293 | /* | |
294 | * Only warn about EPIPE when quiet mode is | |
295 | * deactivated. | |
296 | * We consider EPIPE as expected. | |
297 | */ | |
298 | if (errno != EPIPE || !lttng_opt_quiet) { | |
299 | PERROR("sendmsg"); | |
300 | } | |
301 | goto end; | |
302 | } | |
303 | } | |
304 | iov[0].iov_len -= ret; | |
a6bc4ca9 | 305 | iov[0].iov_base = (char *) iov[0].iov_base + ret; |
c72435ad JG |
306 | } |
307 | ret = len; | |
308 | end: | |
309 | return ret; | |
310 | } | |
311 | ||
312 | /* | |
313 | * Send buf data of size len. Using sendmsg API. | |
314 | * Only use with non-blocking sockets. The difference with the blocking version | |
315 | * of the function is that this one does not retry to send on partial sends, | |
316 | * except if the interruption was caused by a signal (EINTR). | |
317 | * | |
44c180ca JR |
318 | * NOTE: EPIPE errors are NOT reported. This call expects the socket to be in a |
319 | * poll set. The poll loop will handle the EPIPE original cause. | |
320 | * | |
c72435ad JG |
321 | * Return the size of sent data. |
322 | */ | |
c72435ad JG |
323 | ssize_t lttcomm_send_unix_sock_non_block(int sock, const void *buf, size_t len) |
324 | { | |
325 | struct msghdr msg; | |
326 | struct iovec iov[1]; | |
327 | ssize_t ret; | |
328 | ||
a0377dfe FD |
329 | LTTNG_ASSERT(sock); |
330 | LTTNG_ASSERT(buf); | |
331 | LTTNG_ASSERT(len > 0); | |
982583bd | 332 | |
c72435ad JG |
333 | memset(&msg, 0, sizeof(msg)); |
334 | ||
335 | iov[0].iov_base = (void *) buf; | |
336 | iov[0].iov_len = len; | |
337 | msg.msg_iov = iov; | |
338 | msg.msg_iovlen = 1; | |
339 | ||
340 | retry: | |
0d37f2bc DG |
341 | ret = sendmsg(sock, &msg, 0); |
342 | if (ret < 0) { | |
c72435ad JG |
343 | if (errno == EINTR) { |
344 | goto retry; | |
345 | } else { | |
44c180ca JR |
346 | /* |
347 | * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected. | |
348 | */ | |
942003e5 MJ |
349 | DIAGNOSTIC_PUSH |
350 | DIAGNOSTIC_IGNORE_LOGICAL_OP | |
44c180ca JR |
351 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
352 | errno == EPIPE) { | |
942003e5 | 353 | DIAGNOSTIC_POP |
44c180ca JR |
354 | /* |
355 | * This can happen in non blocking mode. | |
356 | * Nothing was sent. | |
357 | */ | |
358 | ret = 0; | |
359 | goto end; | |
c72435ad | 360 | } |
44c180ca JR |
361 | |
362 | /* Unexpected error */ | |
363 | PERROR("sendmsg"); | |
364 | ret = -1; | |
c72435ad | 365 | goto end; |
0d37f2bc DG |
366 | } |
367 | } | |
c72435ad | 368 | end: |
0d37f2bc DG |
369 | return ret; |
370 | } | |
371 | ||
372 | /* | |
373 | * Shutdown cleanly a unix socket. | |
374 | */ | |
375 | int lttcomm_close_unix_sock(int sock) | |
376 | { | |
377 | int ret, closeret; | |
378 | ||
379 | /* Shutdown receptions and transmissions */ | |
380 | ret = shutdown(sock, SHUT_RDWR); | |
381 | if (ret < 0) { | |
7d1f4920 MJ |
382 | /* |
383 | * The socket is already disconnected, don't error out. | |
384 | * This doesn't happen on Linux, but it does on FreeBSD, see: | |
385 | * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227259 | |
386 | */ | |
387 | if (errno == ENOTCONN) { | |
388 | ret = 0; | |
389 | } else { | |
390 | PERROR("shutdown"); | |
391 | } | |
0d37f2bc DG |
392 | } |
393 | ||
394 | closeret = close(sock); | |
395 | if (closeret) { | |
396 | PERROR("close"); | |
397 | } | |
398 | ||
399 | return ret; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Send a message accompanied by fd(s) over a unix socket. | |
404 | * | |
405 | * Returns the size of data sent, or negative error value. | |
406 | */ | |
ac2f30af | 407 | ssize_t lttcomm_send_fds_unix_sock(int sock, const int *fds, size_t nb_fd) |
0d37f2bc DG |
408 | { |
409 | struct msghdr msg; | |
410 | struct cmsghdr *cmptr; | |
411 | struct iovec iov[1]; | |
412 | ssize_t ret = -1; | |
413 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
414 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
415 | char dummy = 0; | |
416 | ||
a0377dfe FD |
417 | LTTNG_ASSERT(sock); |
418 | LTTNG_ASSERT(fds); | |
419 | LTTNG_ASSERT(nb_fd > 0); | |
982583bd | 420 | |
0d37f2bc | 421 | memset(&msg, 0, sizeof(msg)); |
b3f35e02 | 422 | memset(tmp, 0, sizeof(tmp)); |
0d37f2bc DG |
423 | |
424 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) | |
425 | return -EINVAL; | |
426 | ||
427 | msg.msg_control = (caddr_t)tmp; | |
428 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
429 | ||
430 | cmptr = CMSG_FIRSTHDR(&msg); | |
1d8d0328 MJ |
431 | if (!cmptr) { |
432 | return -1; | |
433 | } | |
b3f35e02 | 434 | |
0d37f2bc DG |
435 | cmptr->cmsg_level = SOL_SOCKET; |
436 | cmptr->cmsg_type = SCM_RIGHTS; | |
437 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); | |
438 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); | |
439 | /* Sum of the length of all control messages in the buffer: */ | |
440 | msg.msg_controllen = cmptr->cmsg_len; | |
441 | ||
442 | iov[0].iov_base = &dummy; | |
443 | iov[0].iov_len = 1; | |
444 | msg.msg_iov = iov; | |
445 | msg.msg_iovlen = 1; | |
446 | ||
447 | do { | |
448 | ret = sendmsg(sock, &msg, 0); | |
449 | } while (ret < 0 && errno == EINTR); | |
450 | if (ret < 0) { | |
451 | /* | |
452 | * Only warn about EPIPE when quiet mode is deactivated. | |
453 | * We consider EPIPE as expected. | |
454 | */ | |
455 | if (errno != EPIPE || !lttng_opt_quiet) { | |
456 | PERROR("sendmsg"); | |
457 | } | |
458 | } | |
459 | return ret; | |
460 | } | |
461 | ||
fe489250 JG |
462 | /* |
463 | * Send the fd(s) of a payload view over a unix socket. | |
464 | * | |
465 | * Returns the size of data sent, or negative error value. | |
466 | */ | |
467 | static | |
468 | ssize_t _lttcomm_send_payload_view_fds_unix_sock(int sock, | |
469 | struct lttng_payload_view *view, | |
470 | bool blocking) | |
471 | { | |
472 | int i; | |
473 | ssize_t ret; | |
474 | struct lttng_dynamic_array raw_fds; | |
475 | const int fd_count = lttng_payload_view_get_fd_handle_count(view); | |
476 | ||
477 | lttng_dynamic_array_init(&raw_fds, sizeof(int), NULL); | |
478 | ||
3545ccee JR |
479 | if (fd_count < 0) { |
480 | ret = -LTTNG_ERR_INVALID; | |
481 | goto end; | |
482 | } | |
483 | ||
fe489250 JG |
484 | /* |
485 | * Prepare a contiguous array of file descriptors to send them. | |
486 | * | |
487 | * Note that the reference to each fd is released during the iteration; | |
488 | * we're just getting the numerical value of the fds to conform to the | |
489 | * syscall's interface. We rely on the fact that "view" must remain | |
490 | * valid for the duration of the call and that the underlying payload | |
491 | * owns a reference to the fd_handles. | |
492 | */ | |
493 | for (i = 0; i < fd_count; i++) { | |
494 | struct fd_handle *handle = | |
495 | lttng_payload_view_pop_fd_handle(view); | |
496 | const int raw_fd = fd_handle_get_fd(handle); | |
497 | const int add_ret = lttng_dynamic_array_add_element( | |
498 | &raw_fds, &raw_fd); | |
499 | ||
500 | fd_handle_put(handle); | |
501 | if (add_ret) { | |
502 | ret = -LTTNG_ERR_NOMEM; | |
503 | goto end; | |
504 | } | |
505 | } | |
506 | ||
507 | if (blocking) { | |
508 | ret = lttcomm_send_fds_unix_sock(sock, | |
509 | (const int *) raw_fds.buffer.data, fd_count); | |
510 | } else { | |
511 | ret = lttcomm_send_fds_unix_sock_non_block(sock, | |
512 | (const int *) raw_fds.buffer.data, fd_count); | |
513 | } | |
514 | ||
515 | end: | |
516 | lttng_dynamic_array_reset(&raw_fds); | |
517 | return ret; | |
518 | } | |
519 | ||
fe489250 JG |
520 | ssize_t lttcomm_send_payload_view_fds_unix_sock(int sock, |
521 | struct lttng_payload_view *view) | |
522 | { | |
523 | return _lttcomm_send_payload_view_fds_unix_sock(sock, view, true); | |
524 | } | |
525 | ||
fe489250 JG |
526 | ssize_t lttcomm_send_payload_view_fds_unix_sock_non_block(int sock, |
527 | struct lttng_payload_view *view) | |
528 | { | |
529 | return _lttcomm_send_payload_view_fds_unix_sock(sock, view, false); | |
530 | } | |
531 | ||
b72ce630 JR |
532 | /* |
533 | * Send a message accompanied by fd(s) over a unix socket. | |
534 | * Only use for non blocking socket. | |
535 | * | |
536 | * Returns the size of data sent, or negative error value. | |
537 | */ | |
b72ce630 JR |
538 | ssize_t lttcomm_send_fds_unix_sock_non_block(int sock, const int *fds, size_t nb_fd) |
539 | { | |
540 | struct msghdr msg; | |
541 | struct cmsghdr *cmptr; | |
542 | struct iovec iov[1]; | |
543 | ssize_t ret = -1; | |
544 | unsigned int sizeof_fds = nb_fd * sizeof(int); | |
545 | char tmp[CMSG_SPACE(sizeof_fds)]; | |
546 | char dummy = 0; | |
547 | ||
a0377dfe FD |
548 | LTTNG_ASSERT(sock); |
549 | LTTNG_ASSERT(fds); | |
550 | LTTNG_ASSERT(nb_fd > 0); | |
982583bd | 551 | |
b72ce630 JR |
552 | memset(&msg, 0, sizeof(msg)); |
553 | memset(tmp, 0, sizeof(tmp)); | |
554 | ||
555 | if (nb_fd > LTTCOMM_MAX_SEND_FDS) | |
556 | return -EINVAL; | |
557 | ||
558 | msg.msg_control = (caddr_t)tmp; | |
559 | msg.msg_controllen = CMSG_LEN(sizeof_fds); | |
560 | ||
561 | cmptr = CMSG_FIRSTHDR(&msg); | |
562 | if (!cmptr) { | |
563 | return -1; | |
564 | } | |
565 | ||
566 | cmptr->cmsg_level = SOL_SOCKET; | |
567 | cmptr->cmsg_type = SCM_RIGHTS; | |
568 | cmptr->cmsg_len = CMSG_LEN(sizeof_fds); | |
569 | memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); | |
570 | /* Sum of the length of all control messages in the buffer: */ | |
571 | msg.msg_controllen = cmptr->cmsg_len; | |
572 | ||
573 | iov[0].iov_base = &dummy; | |
574 | iov[0].iov_len = 1; | |
575 | msg.msg_iov = iov; | |
576 | msg.msg_iovlen = 1; | |
577 | ||
578 | retry: | |
579 | ret = sendmsg(sock, &msg, 0); | |
580 | if (ret < 0) { | |
581 | if (errno == EINTR) { | |
582 | goto retry; | |
583 | } else { | |
584 | /* | |
585 | * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected. | |
586 | */ | |
942003e5 MJ |
587 | DIAGNOSTIC_PUSH |
588 | DIAGNOSTIC_IGNORE_LOGICAL_OP | |
b72ce630 | 589 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
942003e5 | 590 | DIAGNOSTIC_POP |
b72ce630 JR |
591 | /* |
592 | * This can happen in non blocking mode. | |
593 | * Nothing was sent. | |
594 | */ | |
595 | ret = 0; | |
596 | goto end; | |
597 | } | |
598 | ||
599 | if (errno == EPIPE) { | |
600 | /* Expected error, pass error to caller */ | |
601 | DBG3("EPIPE on sendmsg"); | |
602 | ret = -1; | |
603 | goto end; | |
604 | } | |
605 | ||
606 | /* Unexpected error */ | |
607 | PERROR("sendmsg"); | |
608 | ret = -1; | |
609 | goto end; | |
610 | } | |
611 | } | |
612 | ||
613 | end: | |
614 | return ret; | |
615 | } | |
616 | ||
0d37f2bc DG |
617 | /* |
618 | * Recv a message accompanied by fd(s) from a unix socket. | |
619 | * | |
620 | * Returns the size of received data, or negative error value. | |
621 | * | |
622 | * Expect at most "nb_fd" file descriptors. Returns the number of fd | |
623 | * actually received in nb_fd. | |
624 | */ | |
625 | ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) | |
626 | { | |
627 | struct iovec iov[1]; | |
628 | ssize_t ret = 0; | |
629 | struct cmsghdr *cmsg; | |
630 | size_t sizeof_fds = nb_fd * sizeof(int); | |
b3f35e02 | 631 | |
ba49ae8c MJ |
632 | #ifdef __linux__ |
633 | /* Account for the struct ucred cmsg in the buffer size */ | |
634 | #define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds) + CMSG_SPACE(sizeof(struct ucred)) | |
635 | #else | |
636 | #define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds) | |
637 | #endif /* __linux__ */ | |
638 | ||
639 | char recv_buf[LTTNG_SOCK_RECV_FDS_BUF_SIZE]; | |
0d37f2bc DG |
640 | struct msghdr msg; |
641 | char dummy; | |
642 | ||
a0377dfe FD |
643 | LTTNG_ASSERT(sock); |
644 | LTTNG_ASSERT(fds); | |
645 | LTTNG_ASSERT(nb_fd > 0); | |
982583bd | 646 | |
0d37f2bc DG |
647 | memset(&msg, 0, sizeof(msg)); |
648 | ||
649 | /* Prepare to receive the structures */ | |
650 | iov[0].iov_base = &dummy; | |
651 | iov[0].iov_len = 1; | |
652 | msg.msg_iov = iov; | |
653 | msg.msg_iovlen = 1; | |
b3f35e02 FD |
654 | |
655 | cmsg = (struct cmsghdr *) recv_buf; | |
656 | cmsg->cmsg_len = CMSG_LEN(sizeof_fds); | |
657 | cmsg->cmsg_level = SOL_SOCKET; | |
658 | cmsg->cmsg_type = SCM_RIGHTS; | |
659 | ||
660 | msg.msg_control = cmsg; | |
661 | msg.msg_controllen = CMSG_LEN(sizeof(recv_buf)); | |
662 | msg.msg_flags = 0; | |
0d37f2bc | 663 | |
b72ce630 JR |
664 | retry: |
665 | ret = lttng_recvmsg_nosigpipe(sock, &msg); | |
0d37f2bc | 666 | if (ret < 0) { |
b72ce630 JR |
667 | if (errno == EINTR) { |
668 | goto retry; | |
669 | } else { | |
670 | /* We consider EPIPE and EAGAIN as expected. */ | |
671 | if (!lttng_opt_quiet && | |
672 | (errno != EPIPE && errno != EAGAIN)) { | |
673 | PERROR("recvmsg"); | |
674 | } | |
675 | goto end; | |
676 | } | |
677 | } | |
678 | ||
679 | if (ret != 1) { | |
680 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
681 | ret, 1); | |
0d37f2bc DG |
682 | goto end; |
683 | } | |
b3f35e02 | 684 | |
b72ce630 JR |
685 | if (msg.msg_flags & MSG_CTRUNC) { |
686 | fprintf(stderr, "Error: Control message truncated.\n"); | |
687 | ret = -1; | |
688 | goto end; | |
689 | } | |
690 | ||
691 | /* | |
692 | * If the socket was configured with SO_PASSCRED, the kernel will add a | |
693 | * control message (cmsg) to the ancillary data of the unix socket. We | |
694 | * need to expect a cmsg of the SCM_CREDENTIALS as the first control | |
695 | * message. | |
696 | */ | |
697 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { | |
698 | if (cmsg->cmsg_level != SOL_SOCKET) { | |
699 | fprintf(stderr, "Error: The socket needs to be of type SOL_SOCKET\n"); | |
700 | ret = -1; | |
701 | goto end; | |
702 | } | |
703 | if (cmsg->cmsg_type == SCM_RIGHTS) { | |
704 | /* | |
705 | * We found the controle message for file descriptors, | |
706 | * now copy the fds to the fds ptr and return success. | |
707 | */ | |
708 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { | |
709 | fprintf(stderr, "Error: Received %zu bytes of" | |
710 | "ancillary data for FDs, expected %zu\n", | |
711 | (size_t) cmsg->cmsg_len, | |
712 | (size_t) CMSG_LEN(sizeof_fds)); | |
713 | ret = -1; | |
714 | goto end; | |
715 | } | |
716 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); | |
717 | ret = sizeof_fds; | |
718 | goto end; | |
719 | } | |
720 | #ifdef __linux__ | |
721 | if (cmsg->cmsg_type == SCM_CREDENTIALS) { | |
722 | /* | |
723 | * Expect credentials to be sent when expecting fds even | |
724 | * if no credential were include in the send(). The | |
725 | * kernel adds them... | |
726 | */ | |
727 | ret = -1; | |
728 | } | |
729 | #endif /* __linux__ */ | |
730 | } | |
731 | end: | |
732 | return ret; | |
733 | } | |
734 | ||
fe489250 JG |
735 | static |
736 | void close_raw_fd(void *ptr) | |
737 | { | |
738 | const int raw_fd = *((const int *) ptr); | |
739 | ||
740 | if (raw_fd >= 0) { | |
741 | const int ret = close(raw_fd); | |
742 | ||
743 | if (ret) { | |
744 | PERROR("Failed to close file descriptor %d", raw_fd); | |
745 | } | |
746 | } | |
747 | } | |
748 | ||
749 | static | |
750 | enum lttng_error_code add_fds_to_payload(struct lttng_dynamic_array *raw_fds, | |
751 | struct lttng_payload *payload) | |
752 | { | |
753 | int i; | |
754 | enum lttng_error_code ret_code = LTTNG_OK; | |
755 | const int fd_count = lttng_dynamic_array_get_count(raw_fds); | |
756 | ||
757 | for (i = 0; i < fd_count; i++) { | |
758 | int ret; | |
759 | struct fd_handle *handle; | |
760 | int *raw_fd = (int *) lttng_dynamic_array_get_element( | |
761 | raw_fds, i); | |
762 | ||
a0377dfe | 763 | LTTNG_ASSERT(*raw_fd != -1); |
5dbd9742 | 764 | |
fe489250 JG |
765 | handle = fd_handle_create(*raw_fd); |
766 | if (!handle) { | |
767 | ret_code = LTTNG_ERR_NOMEM; | |
768 | goto end; | |
769 | } | |
770 | ||
771 | /* FD ownership transferred to the handle. */ | |
772 | *raw_fd = -1; | |
773 | ||
774 | ret = lttng_payload_push_fd_handle(payload, handle); | |
775 | fd_handle_put(handle); | |
776 | if (ret) { | |
777 | ret_code = LTTNG_ERR_NOMEM; | |
778 | goto end; | |
779 | } | |
780 | } | |
781 | ||
782 | end: | |
783 | return ret_code; | |
784 | } | |
785 | ||
786 | static | |
787 | ssize_t _lttcomm_recv_payload_fds_unix_sock(int sock, size_t nb_fd, | |
788 | struct lttng_payload *payload, bool blocking) | |
789 | { | |
5dbd9742 | 790 | int i = 0; |
fe489250 JG |
791 | enum lttng_error_code add_ret; |
792 | ssize_t ret; | |
5dbd9742 | 793 | int default_value = -1; |
fe489250 JG |
794 | struct lttng_dynamic_array raw_fds; |
795 | ||
a0377dfe FD |
796 | LTTNG_ASSERT(sock); |
797 | LTTNG_ASSERT(payload); | |
798 | LTTNG_ASSERT(nb_fd > 0); | |
982583bd | 799 | |
fe489250 | 800 | lttng_dynamic_array_init(&raw_fds, sizeof(int), close_raw_fd); |
5dbd9742 JR |
801 | |
802 | for (i = 0; i < nb_fd; i++) { | |
803 | if (lttng_dynamic_array_add_element(&raw_fds, &default_value)) { | |
804 | ret = -LTTNG_ERR_NOMEM; | |
805 | goto end; | |
806 | } | |
fe489250 JG |
807 | } |
808 | ||
809 | if (blocking) { | |
810 | ret = lttcomm_recv_fds_unix_sock( | |
811 | sock, (int *) raw_fds.buffer.data, nb_fd); | |
812 | } else { | |
813 | ret = lttcomm_recv_fds_unix_sock_non_block( | |
814 | sock, (int *) raw_fds.buffer.data, nb_fd); | |
815 | } | |
816 | ||
b3ba184e | 817 | if (ret <= 0) { |
fe489250 JG |
818 | goto end; |
819 | } | |
820 | ||
821 | add_ret = add_fds_to_payload(&raw_fds, payload); | |
822 | if (add_ret != LTTNG_OK) { | |
823 | ret = - (int) add_ret; | |
824 | goto end; | |
825 | } | |
826 | ||
827 | end: | |
828 | lttng_dynamic_array_reset(&raw_fds); | |
829 | return ret; | |
830 | } | |
831 | ||
fe489250 JG |
832 | ssize_t lttcomm_recv_payload_fds_unix_sock(int sock, size_t nb_fd, |
833 | struct lttng_payload *payload) | |
834 | { | |
835 | return _lttcomm_recv_payload_fds_unix_sock(sock, nb_fd, payload, true); | |
836 | } | |
837 | ||
fe489250 JG |
838 | ssize_t lttcomm_recv_payload_fds_unix_sock_non_block(int sock, size_t nb_fd, |
839 | struct lttng_payload *payload) | |
840 | { | |
841 | return _lttcomm_recv_payload_fds_unix_sock(sock, nb_fd, payload, false); | |
842 | } | |
843 | ||
b72ce630 JR |
844 | /* |
845 | * Recv a message accompanied by fd(s) from a non-blocking unix socket. | |
846 | * Only use with non-blocking sockets. | |
847 | * | |
848 | * Returns the size of received data, or negative error value. | |
849 | * | |
850 | * Expect at most "nb_fd" file descriptors. | |
851 | * | |
852 | * Note that based on our comprehension, partial reception of fds is not | |
853 | * possible since the FDs are actually in the control message. It is all or | |
854 | * nothing, still the sender side can send the wrong number of fds. | |
855 | */ | |
b72ce630 JR |
856 | ssize_t lttcomm_recv_fds_unix_sock_non_block(int sock, int *fds, size_t nb_fd) |
857 | { | |
858 | struct iovec iov[1]; | |
859 | ssize_t ret = 0; | |
860 | struct cmsghdr *cmsg; | |
861 | size_t sizeof_fds = nb_fd * sizeof(int); | |
862 | ||
a0377dfe FD |
863 | LTTNG_ASSERT(sock); |
864 | LTTNG_ASSERT(fds); | |
865 | LTTNG_ASSERT(nb_fd > 0); | |
982583bd | 866 | |
b72ce630 JR |
867 | #ifdef __linux__ |
868 | /* Account for the struct ucred cmsg in the buffer size */ | |
869 | #define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds) + CMSG_SPACE(sizeof(struct ucred)) | |
870 | #else | |
871 | #define LTTNG_SOCK_RECV_FDS_BUF_SIZE CMSG_SPACE(sizeof_fds) | |
872 | #endif /* __linux__ */ | |
873 | ||
874 | char recv_buf[LTTNG_SOCK_RECV_FDS_BUF_SIZE]; | |
875 | struct msghdr msg; | |
876 | char dummy; | |
877 | ||
878 | memset(&msg, 0, sizeof(msg)); | |
879 | ||
880 | /* Prepare to receive the structures */ | |
881 | iov[0].iov_base = &dummy; | |
882 | iov[0].iov_len = 1; | |
883 | msg.msg_iov = iov; | |
884 | msg.msg_iovlen = 1; | |
885 | ||
886 | cmsg = (struct cmsghdr *) recv_buf; | |
887 | cmsg->cmsg_len = CMSG_LEN(sizeof_fds); | |
888 | cmsg->cmsg_level = SOL_SOCKET; | |
889 | cmsg->cmsg_type = SCM_RIGHTS; | |
890 | ||
891 | msg.msg_control = cmsg; | |
892 | msg.msg_controllen = CMSG_LEN(sizeof(recv_buf)); | |
893 | msg.msg_flags = 0; | |
894 | ||
895 | retry: | |
896 | ret = lttng_recvmsg_nosigpipe(sock, &msg); | |
897 | if (ret < 0) { | |
898 | if (errno == EINTR) { | |
899 | goto retry; | |
900 | } else { | |
901 | /* | |
902 | * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected. | |
903 | */ | |
942003e5 MJ |
904 | DIAGNOSTIC_PUSH |
905 | DIAGNOSTIC_IGNORE_LOGICAL_OP | |
b72ce630 | 906 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
942003e5 | 907 | DIAGNOSTIC_POP |
b72ce630 JR |
908 | /* |
909 | * This can happen in non blocking mode. | |
910 | * Nothing was recv. | |
911 | */ | |
912 | ret = 0; | |
913 | goto end; | |
914 | } | |
915 | ||
916 | if (errno == EPIPE) { | |
917 | /* Expected error, pass error to caller */ | |
918 | DBG3("EPIPE on recvmsg"); | |
919 | ret = -1; | |
920 | goto end; | |
921 | } | |
922 | ||
923 | /* Unexpected error */ | |
924 | PERROR("recvmsg"); | |
925 | ret = -1; | |
926 | goto end; | |
927 | } | |
928 | } | |
929 | ||
0d37f2bc DG |
930 | if (ret != 1) { |
931 | fprintf(stderr, "Error: Received %zd bytes, expected %d\n", | |
932 | ret, 1); | |
933 | goto end; | |
934 | } | |
b3f35e02 | 935 | |
0d37f2bc DG |
936 | if (msg.msg_flags & MSG_CTRUNC) { |
937 | fprintf(stderr, "Error: Control message truncated.\n"); | |
938 | ret = -1; | |
939 | goto end; | |
940 | } | |
b3f35e02 FD |
941 | |
942 | /* | |
943 | * If the socket was configured with SO_PASSCRED, the kernel will add a | |
944 | * control message (cmsg) to the ancillary data of the unix socket. We | |
945 | * need to expect a cmsg of the SCM_CREDENTIALS as the first control | |
946 | * message. | |
947 | */ | |
948 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { | |
b3f35e02 FD |
949 | if (cmsg->cmsg_level != SOL_SOCKET) { |
950 | fprintf(stderr, "Error: The socket needs to be of type SOL_SOCKET\n"); | |
951 | ret = -1; | |
952 | goto end; | |
953 | } | |
954 | if (cmsg->cmsg_type == SCM_RIGHTS) { | |
955 | /* | |
956 | * We found the controle message for file descriptors, | |
957 | * now copy the fds to the fds ptr and return success. | |
958 | */ | |
959 | if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { | |
960 | fprintf(stderr, "Error: Received %zu bytes of" | |
961 | "ancillary data for FDs, expected %zu\n", | |
962 | (size_t) cmsg->cmsg_len, | |
963 | (size_t) CMSG_LEN(sizeof_fds)); | |
964 | ret = -1; | |
965 | goto end; | |
966 | } | |
967 | memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); | |
968 | ret = sizeof_fds; | |
969 | goto end; | |
970 | } | |
ba49ae8c | 971 | #ifdef __linux__ |
b3f35e02 FD |
972 | if (cmsg->cmsg_type == SCM_CREDENTIALS) { |
973 | /* | |
974 | * Expect credentials to be sent when expecting fds even | |
975 | * if no credential were include in the send(). The | |
976 | * kernel adds them... | |
977 | */ | |
b3f35e02 FD |
978 | ret = -1; |
979 | } | |
ba49ae8c | 980 | #endif /* __linux__ */ |
0d37f2bc | 981 | } |
0d37f2bc DG |
982 | end: |
983 | return ret; | |
984 | } | |
985 | ||
986 | /* | |
987 | * Send a message with credentials over a unix socket. | |
988 | * | |
989 | * Returns the size of data sent, or negative error value. | |
990 | */ | |
e368fb43 | 991 | ssize_t lttcomm_send_creds_unix_sock(int sock, const void *buf, size_t len) |
0d37f2bc DG |
992 | { |
993 | struct msghdr msg; | |
994 | struct iovec iov[1]; | |
995 | ssize_t ret = -1; | |
9bc1a4b4 | 996 | #if defined(__linux__) || defined(__CYGWIN__) |
0d37f2bc DG |
997 | struct cmsghdr *cmptr; |
998 | size_t sizeof_cred = sizeof(lttng_sock_cred); | |
999 | char anc_buf[CMSG_SPACE(sizeof_cred)]; | |
1000 | lttng_sock_cred *creds; | |
8bbffd54 MJ |
1001 | |
1002 | memset(anc_buf, 0, CMSG_SPACE(sizeof_cred) * sizeof(char)); | |
9bc1a4b4 | 1003 | #endif /* __linux__, __CYGWIN__ */ |
0d37f2bc DG |
1004 | |
1005 | memset(&msg, 0, sizeof(msg)); | |
1006 | ||
a0377dfe FD |
1007 | LTTNG_ASSERT(sock); |
1008 | LTTNG_ASSERT(buf); | |
1009 | LTTNG_ASSERT(len > 0); | |
982583bd | 1010 | |
e368fb43 | 1011 | iov[0].iov_base = (void *) buf; |
0d37f2bc DG |
1012 | iov[0].iov_len = len; |
1013 | msg.msg_iov = iov; | |
1014 | msg.msg_iovlen = 1; | |
1015 | ||
9bc1a4b4 | 1016 | #if defined(__linux__) || defined(__CYGWIN__) |
0d37f2bc DG |
1017 | msg.msg_control = (caddr_t) anc_buf; |
1018 | msg.msg_controllen = CMSG_LEN(sizeof_cred); | |
1019 | ||
1020 | cmptr = CMSG_FIRSTHDR(&msg); | |
1d8d0328 MJ |
1021 | if (!cmptr) { |
1022 | return -1; | |
1023 | } | |
0d37f2bc DG |
1024 | cmptr->cmsg_level = SOL_SOCKET; |
1025 | cmptr->cmsg_type = LTTNG_SOCK_CREDS; | |
1026 | cmptr->cmsg_len = CMSG_LEN(sizeof_cred); | |
1027 | ||
1028 | creds = (lttng_sock_cred*) CMSG_DATA(cmptr); | |
1029 | ||
1030 | LTTNG_SOCK_SET_UID_CRED(creds, geteuid()); | |
1031 | LTTNG_SOCK_SET_GID_CRED(creds, getegid()); | |
1032 | LTTNG_SOCK_SET_PID_CRED(creds, getpid()); | |
9bc1a4b4 | 1033 | #endif /* __linux__, __CYGWIN__ */ |
0d37f2bc DG |
1034 | |
1035 | do { | |
1036 | ret = sendmsg(sock, &msg, 0); | |
1037 | } while (ret < 0 && errno == EINTR); | |
1038 | if (ret < 0) { | |
1039 | /* | |
1040 | * Only warn about EPIPE when quiet mode is deactivated. | |
1041 | * We consider EPIPE as expected. | |
1042 | */ | |
1043 | if (errno != EPIPE || !lttng_opt_quiet) { | |
1044 | PERROR("sendmsg"); | |
1045 | } | |
1046 | } | |
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Recv a message accompanied with credentials from a unix socket. | |
1052 | * | |
1053 | * Returns the size of received data, or negative error value. | |
1054 | */ | |
1055 | ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len, | |
1056 | lttng_sock_cred *creds) | |
1057 | { | |
1058 | struct msghdr msg; | |
1059 | struct iovec iov[1]; | |
1060 | ssize_t ret; | |
4100e49a | 1061 | size_t len_last; |
9bc1a4b4 | 1062 | #if defined(__linux__) || defined(__CYGWIN__) |
0d37f2bc DG |
1063 | struct cmsghdr *cmptr; |
1064 | size_t sizeof_cred = sizeof(lttng_sock_cred); | |
1065 | char anc_buf[CMSG_SPACE(sizeof_cred)]; | |
9bc1a4b4 | 1066 | #endif /* __linux__, __CYGWIN__ */ |
0d37f2bc | 1067 | |
a0377dfe FD |
1068 | LTTNG_ASSERT(sock); |
1069 | LTTNG_ASSERT(buf); | |
1070 | LTTNG_ASSERT(len > 0); | |
1071 | LTTNG_ASSERT(creds); | |
0d37f2bc | 1072 | |
982583bd | 1073 | memset(&msg, 0, sizeof(msg)); |
0d37f2bc DG |
1074 | |
1075 | /* Prepare to receive the structures */ | |
1076 | iov[0].iov_base = buf; | |
1077 | iov[0].iov_len = len; | |
1078 | msg.msg_iov = iov; | |
1079 | msg.msg_iovlen = 1; | |
1080 | ||
9bc1a4b4 | 1081 | #if defined(__linux__) || defined(__CYGWIN__) |
0d37f2bc DG |
1082 | msg.msg_control = anc_buf; |
1083 | msg.msg_controllen = sizeof(anc_buf); | |
9bc1a4b4 | 1084 | #endif /* __linux__, __CYGWIN__ */ |
0d37f2bc DG |
1085 | |
1086 | do { | |
4100e49a | 1087 | len_last = iov[0].iov_len; |
0d37f2bc | 1088 | ret = recvmsg(sock, &msg, 0); |
4100e49a | 1089 | if (ret > 0) { |
a6bc4ca9 | 1090 | iov[0].iov_base = (char *) iov[0].iov_base + ret; |
4100e49a | 1091 | iov[0].iov_len -= ret; |
a0377dfe | 1092 | LTTNG_ASSERT(ret <= len_last); |
4100e49a DG |
1093 | } |
1094 | } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); | |
0d37f2bc DG |
1095 | if (ret < 0) { |
1096 | PERROR("recvmsg fds"); | |
1097 | goto end; | |
4100e49a DG |
1098 | } else if (ret > 0) { |
1099 | ret = len; | |
0d37f2bc | 1100 | } |
4100e49a | 1101 | /* Else ret = 0 meaning an orderly shutdown. */ |
0d37f2bc | 1102 | |
9bc1a4b4 | 1103 | #if defined(__linux__) || defined(__CYGWIN__) |
0d37f2bc DG |
1104 | if (msg.msg_flags & MSG_CTRUNC) { |
1105 | fprintf(stderr, "Error: Control message truncated.\n"); | |
1106 | ret = -1; | |
1107 | goto end; | |
1108 | } | |
1109 | ||
1110 | cmptr = CMSG_FIRSTHDR(&msg); | |
1111 | if (cmptr == NULL) { | |
1112 | fprintf(stderr, "Error: Invalid control message header\n"); | |
1113 | ret = -1; | |
1114 | goto end; | |
1115 | } | |
1116 | ||
1117 | if (cmptr->cmsg_level != SOL_SOCKET || | |
1118 | cmptr->cmsg_type != LTTNG_SOCK_CREDS) { | |
1119 | fprintf(stderr, "Didn't received any credentials\n"); | |
1120 | ret = -1; | |
1121 | goto end; | |
1122 | } | |
1123 | ||
1124 | if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) { | |
1125 | fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n", | |
1126 | (size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred)); | |
1127 | ret = -1; | |
1128 | goto end; | |
1129 | } | |
1130 | ||
1131 | memcpy(creds, CMSG_DATA(cmptr), sizeof_cred); | |
9bc1a4b4 JG |
1132 | #elif (defined(__FreeBSD__) || defined(__sun__) || defined(__APPLE__)) |
1133 | if (lttng_get_unix_socket_peer_creds(sock, creds)) { | |
1134 | fprintf(stderr, "ARG\n"); | |
1135 | ret = -1; | |
1136 | goto end; | |
0d37f2bc DG |
1137 | } |
1138 | #else | |
1139 | #error "Please implement credential support for your OS." | |
9bc1a4b4 | 1140 | #endif /* __linux__, __CYGWIN__ */ |
0d37f2bc DG |
1141 | |
1142 | end: | |
1143 | return ret; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * Set socket option to use credentials passing. | |
1148 | */ | |
9bc1a4b4 | 1149 | #if defined(__linux__) || defined(__CYGWIN__) |
0d37f2bc DG |
1150 | int lttcomm_setsockopt_creds_unix_sock(int sock) |
1151 | { | |
1152 | int ret, on = 1; | |
1153 | ||
1154 | /* Set socket for credentials retrieval */ | |
1155 | ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)); | |
1156 | if (ret < 0) { | |
1157 | PERROR("setsockopt creds unix sock"); | |
1158 | } | |
1159 | return ret; | |
1160 | } | |
9bc1a4b4 | 1161 | #elif (defined(__FreeBSD__) || defined(__sun__) || defined(__APPLE__)) |
4eac90eb | 1162 | int lttcomm_setsockopt_creds_unix_sock(int sock __attribute__((unused))) |
0d37f2bc DG |
1163 | { |
1164 | return 0; | |
1165 | } | |
1166 | #else | |
1167 | #error "Please implement credential support for your OS." | |
1168 | #endif /* __linux__ */ |