1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
4 | */ |
5 | |
6 | #include <stdio.h> |
7 | #include <unistd.h> |
8 | #include <stdlib.h> |
9 | #include <string.h> |
10 | #include <errno.h> |
11 | #include <fcntl.h> |
12 | #include <signal.h> |
13 | #include <linux/falloc.h> |
14 | #include <sys/ioctl.h> |
15 | #include <sys/mount.h> |
16 | #include <sys/socket.h> |
17 | #include <sys/stat.h> |
18 | #include <sys/sysmacros.h> |
19 | #include <sys/un.h> |
20 | #include <sys/types.h> |
21 | #include <sys/eventfd.h> |
22 | #include <poll.h> |
23 | #include <os.h> |
24 | |
25 | static void copy_stat(struct uml_stat *dst, const struct stat64 *src) |
26 | { |
27 | *dst = ((struct uml_stat) { |
28 | .ust_dev = src->st_dev, /* device */ |
29 | .ust_ino = src->st_ino, /* inode */ |
30 | .ust_mode = src->st_mode, /* protection */ |
31 | .ust_nlink = src->st_nlink, /* number of hard links */ |
32 | .ust_uid = src->st_uid, /* user ID of owner */ |
33 | .ust_gid = src->st_gid, /* group ID of owner */ |
34 | .ust_size = src->st_size, /* total size, in bytes */ |
35 | .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */ |
36 | .ust_blocks = src->st_blocks, /* number of blocks allocated */ |
37 | .ust_atime = src->st_atime, /* time of last access */ |
38 | .ust_mtime = src->st_mtime, /* time of last modification */ |
39 | .ust_ctime = src->st_ctime, /* time of last change */ |
40 | }); |
41 | } |
42 | |
43 | int os_stat_fd(const int fd, struct uml_stat *ubuf) |
44 | { |
45 | struct stat64 sbuf; |
46 | int err; |
47 | |
48 | CATCH_EINTR(err = fstat64(fd, &sbuf)); |
49 | if (err < 0) |
50 | return -errno; |
51 | |
52 | if (ubuf != NULL) |
53 | copy_stat(dst: ubuf, src: &sbuf); |
54 | return err; |
55 | } |
56 | |
57 | int os_stat_file(const char *file_name, struct uml_stat *ubuf) |
58 | { |
59 | struct stat64 sbuf; |
60 | int err; |
61 | |
62 | CATCH_EINTR(err = stat64(file_name, &sbuf)); |
63 | if (err < 0) |
64 | return -errno; |
65 | |
66 | if (ubuf != NULL) |
67 | copy_stat(dst: ubuf, src: &sbuf); |
68 | return err; |
69 | } |
70 | |
71 | int os_access(const char *file, int mode) |
72 | { |
73 | int amode, err; |
74 | |
75 | amode = (mode & OS_ACC_R_OK ? R_OK : 0) | |
76 | (mode & OS_ACC_W_OK ? W_OK : 0) | |
77 | (mode & OS_ACC_X_OK ? X_OK : 0) | |
78 | (mode & OS_ACC_F_OK ? F_OK : 0); |
79 | |
80 | err = access(file, amode); |
81 | if (err < 0) |
82 | return -errno; |
83 | |
84 | return 0; |
85 | } |
86 | |
87 | /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ |
88 | int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) |
89 | { |
90 | int err; |
91 | |
92 | err = ioctl(fd, cmd, arg); |
93 | if (err < 0) |
94 | return -errno; |
95 | |
96 | return err; |
97 | } |
98 | |
99 | /* FIXME: ensure namebuf in os_get_if_name is big enough */ |
100 | int os_get_ifname(int fd, char* namebuf) |
101 | { |
102 | if (ioctl(fd, SIOCGIFNAME, namebuf) < 0) |
103 | return -errno; |
104 | |
105 | return 0; |
106 | } |
107 | |
108 | int os_set_slip(int fd) |
109 | { |
110 | int disc, sencap; |
111 | |
112 | disc = N_SLIP; |
113 | if (ioctl(fd, TIOCSETD, &disc) < 0) |
114 | return -errno; |
115 | |
116 | sencap = 0; |
117 | if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0) |
118 | return -errno; |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | int os_mode_fd(int fd, int mode) |
124 | { |
125 | int err; |
126 | |
127 | CATCH_EINTR(err = fchmod(fd, mode)); |
128 | if (err < 0) |
129 | return -errno; |
130 | |
131 | return 0; |
132 | } |
133 | |
134 | int os_file_type(char *file) |
135 | { |
136 | struct uml_stat buf; |
137 | int err; |
138 | |
139 | err = os_stat_file(file_name: file, ubuf: &buf); |
140 | if (err < 0) |
141 | return err; |
142 | |
143 | if (S_ISDIR(buf.ust_mode)) |
144 | return OS_TYPE_DIR; |
145 | else if (S_ISLNK(buf.ust_mode)) |
146 | return OS_TYPE_SYMLINK; |
147 | else if (S_ISCHR(buf.ust_mode)) |
148 | return OS_TYPE_CHARDEV; |
149 | else if (S_ISBLK(buf.ust_mode)) |
150 | return OS_TYPE_BLOCKDEV; |
151 | else if (S_ISFIFO(buf.ust_mode)) |
152 | return OS_TYPE_FIFO; |
153 | else if (S_ISSOCK(buf.ust_mode)) |
154 | return OS_TYPE_SOCK; |
155 | else return OS_TYPE_FILE; |
156 | } |
157 | |
158 | int os_file_mode(const char *file, struct openflags *mode_out) |
159 | { |
160 | int err; |
161 | |
162 | *mode_out = OPENFLAGS(); |
163 | |
164 | err = access(file, W_OK); |
165 | if (err && (errno != EACCES)) |
166 | return -errno; |
167 | else if (!err) |
168 | *mode_out = of_write(*mode_out); |
169 | |
170 | err = access(file, R_OK); |
171 | if (err && (errno != EACCES)) |
172 | return -errno; |
173 | else if (!err) |
174 | *mode_out = of_read(*mode_out); |
175 | |
176 | return err; |
177 | } |
178 | |
179 | int os_open_file(const char *file, struct openflags flags, int mode) |
180 | { |
181 | int fd, err, f = 0; |
182 | |
183 | if (flags.r && flags.w) |
184 | f = O_RDWR; |
185 | else if (flags.r) |
186 | f = O_RDONLY; |
187 | else if (flags.w) |
188 | f = O_WRONLY; |
189 | else f = 0; |
190 | |
191 | if (flags.s) |
192 | f |= O_SYNC; |
193 | if (flags.c) |
194 | f |= O_CREAT; |
195 | if (flags.t) |
196 | f |= O_TRUNC; |
197 | if (flags.e) |
198 | f |= O_EXCL; |
199 | if (flags.a) |
200 | f |= O_APPEND; |
201 | |
202 | fd = open64(file, f, mode); |
203 | if (fd < 0) |
204 | return -errno; |
205 | |
206 | if (flags.cl && fcntl(fd, F_SETFD, 1)) { |
207 | err = -errno; |
208 | close(fd); |
209 | return err; |
210 | } |
211 | |
212 | return fd; |
213 | } |
214 | |
215 | int os_connect_socket(const char *name) |
216 | { |
217 | struct sockaddr_un sock; |
218 | int fd, err; |
219 | |
220 | sock.sun_family = AF_UNIX; |
221 | snprintf(sock.sun_path, sizeof(sock.sun_path), "%s" , name); |
222 | |
223 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
224 | if (fd < 0) { |
225 | err = -errno; |
226 | goto out; |
227 | } |
228 | |
229 | err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); |
230 | if (err) { |
231 | err = -errno; |
232 | goto out_close; |
233 | } |
234 | |
235 | return fd; |
236 | |
237 | out_close: |
238 | close(fd); |
239 | out: |
240 | return err; |
241 | } |
242 | |
243 | void os_close_file(int fd) |
244 | { |
245 | close(fd); |
246 | } |
247 | int os_fsync_file(int fd) |
248 | { |
249 | if (fsync(fd) < 0) |
250 | return -errno; |
251 | return 0; |
252 | } |
253 | |
254 | int os_seek_file(int fd, unsigned long long offset) |
255 | { |
256 | unsigned long long actual; |
257 | |
258 | actual = lseek64(fd, offset, SEEK_SET); |
259 | if (actual != offset) |
260 | return -errno; |
261 | return 0; |
262 | } |
263 | |
264 | int os_read_file(int fd, void *buf, int len) |
265 | { |
266 | int n = read(fd, buf, len); |
267 | |
268 | if (n < 0) |
269 | return -errno; |
270 | return n; |
271 | } |
272 | |
273 | int os_pread_file(int fd, void *buf, int len, unsigned long long offset) |
274 | { |
275 | int n = pread(fd, buf, len, offset); |
276 | |
277 | if (n < 0) |
278 | return -errno; |
279 | return n; |
280 | } |
281 | |
282 | int os_write_file(int fd, const void *buf, int len) |
283 | { |
284 | int n = write(fd, (void *) buf, len); |
285 | |
286 | if (n < 0) |
287 | return -errno; |
288 | return n; |
289 | } |
290 | |
291 | int os_sync_file(int fd) |
292 | { |
293 | int n = fdatasync(fd); |
294 | |
295 | if (n < 0) |
296 | return -errno; |
297 | return n; |
298 | } |
299 | |
300 | int os_pwrite_file(int fd, const void *buf, int len, unsigned long long offset) |
301 | { |
302 | int n = pwrite(fd, (void *) buf, len, offset); |
303 | |
304 | if (n < 0) |
305 | return -errno; |
306 | return n; |
307 | } |
308 | |
309 | |
310 | int os_file_size(const char *file, unsigned long long *size_out) |
311 | { |
312 | struct uml_stat buf; |
313 | int err; |
314 | |
315 | err = os_stat_file(file_name: file, ubuf: &buf); |
316 | if (err < 0) { |
317 | printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n" , file, |
318 | -err); |
319 | return err; |
320 | } |
321 | |
322 | if (S_ISBLK(buf.ust_mode)) { |
323 | int fd; |
324 | long blocks; |
325 | |
326 | fd = open(file, O_RDONLY, 0); |
327 | if (fd < 0) { |
328 | err = -errno; |
329 | printk(UM_KERN_ERR "Couldn't open \"%s\", " |
330 | "errno = %d\n" , file, errno); |
331 | return err; |
332 | } |
333 | if (ioctl(fd, BLKGETSIZE, &blocks) < 0) { |
334 | err = -errno; |
335 | printk(UM_KERN_ERR "Couldn't get the block size of " |
336 | "\"%s\", errno = %d\n" , file, errno); |
337 | close(fd); |
338 | return err; |
339 | } |
340 | *size_out = ((long long) blocks) * 512; |
341 | close(fd); |
342 | } |
343 | else *size_out = buf.ust_size; |
344 | |
345 | return 0; |
346 | } |
347 | |
348 | int os_file_modtime(const char *file, long long *modtime) |
349 | { |
350 | struct uml_stat buf; |
351 | int err; |
352 | |
353 | err = os_stat_file(file_name: file, ubuf: &buf); |
354 | if (err < 0) { |
355 | printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n" , file, |
356 | -err); |
357 | return err; |
358 | } |
359 | |
360 | *modtime = buf.ust_mtime; |
361 | return 0; |
362 | } |
363 | |
364 | int os_set_exec_close(int fd) |
365 | { |
366 | int err; |
367 | |
368 | CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); |
369 | |
370 | if (err < 0) |
371 | return -errno; |
372 | return err; |
373 | } |
374 | |
375 | int os_pipe(int *fds, int stream, int close_on_exec) |
376 | { |
377 | int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; |
378 | |
379 | err = socketpair(AF_UNIX, type, 0, fds); |
380 | if (err < 0) |
381 | return -errno; |
382 | |
383 | if (!close_on_exec) |
384 | return 0; |
385 | |
386 | err = os_set_exec_close(fd: fds[0]); |
387 | if (err < 0) |
388 | goto error; |
389 | |
390 | err = os_set_exec_close(fd: fds[1]); |
391 | if (err < 0) |
392 | goto error; |
393 | |
394 | return 0; |
395 | |
396 | error: |
397 | printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n" , |
398 | -err); |
399 | close(fds[1]); |
400 | close(fds[0]); |
401 | return err; |
402 | } |
403 | |
404 | int os_set_fd_async(int fd) |
405 | { |
406 | int err, flags; |
407 | |
408 | flags = fcntl(fd, F_GETFL); |
409 | if (flags < 0) |
410 | return -errno; |
411 | |
412 | flags |= O_ASYNC | O_NONBLOCK; |
413 | if (fcntl(fd, F_SETFL, flags) < 0) { |
414 | err = -errno; |
415 | printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC " |
416 | "and O_NONBLOCK on fd # %d, errno = %d\n" , fd, errno); |
417 | return err; |
418 | } |
419 | |
420 | if ((fcntl(fd, F_SETSIG, SIGIO) < 0) || |
421 | (fcntl(fd, F_SETOWN, os_getpid()) < 0)) { |
422 | err = -errno; |
423 | printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN " |
424 | "(or F_SETSIG) fd %d, errno = %d\n" , fd, errno); |
425 | return err; |
426 | } |
427 | |
428 | return 0; |
429 | } |
430 | |
431 | int os_clear_fd_async(int fd) |
432 | { |
433 | int flags; |
434 | |
435 | flags = fcntl(fd, F_GETFL); |
436 | if (flags < 0) |
437 | return -errno; |
438 | |
439 | flags &= ~(O_ASYNC | O_NONBLOCK); |
440 | if (fcntl(fd, F_SETFL, flags) < 0) |
441 | return -errno; |
442 | return 0; |
443 | } |
444 | |
445 | int os_set_fd_block(int fd, int blocking) |
446 | { |
447 | int flags; |
448 | |
449 | flags = fcntl(fd, F_GETFL); |
450 | if (flags < 0) |
451 | return -errno; |
452 | |
453 | if (blocking) |
454 | flags &= ~O_NONBLOCK; |
455 | else |
456 | flags |= O_NONBLOCK; |
457 | |
458 | if (fcntl(fd, F_SETFL, flags) < 0) |
459 | return -errno; |
460 | |
461 | return 0; |
462 | } |
463 | |
464 | int os_accept_connection(int fd) |
465 | { |
466 | int new; |
467 | |
468 | new = accept(fd, NULL, 0); |
469 | if (new < 0) |
470 | return -errno; |
471 | return new; |
472 | } |
473 | |
474 | #ifndef SHUT_RD |
475 | #define SHUT_RD 0 |
476 | #endif |
477 | |
478 | #ifndef SHUT_WR |
479 | #define SHUT_WR 1 |
480 | #endif |
481 | |
482 | #ifndef SHUT_RDWR |
483 | #define SHUT_RDWR 2 |
484 | #endif |
485 | |
486 | int os_shutdown_socket(int fd, int r, int w) |
487 | { |
488 | int what, err; |
489 | |
490 | if (r && w) |
491 | what = SHUT_RDWR; |
492 | else if (r) |
493 | what = SHUT_RD; |
494 | else if (w) |
495 | what = SHUT_WR; |
496 | else |
497 | return -EINVAL; |
498 | |
499 | err = shutdown(fd, what); |
500 | if (err < 0) |
501 | return -errno; |
502 | return 0; |
503 | } |
504 | |
505 | int os_rcv_fd(int fd, int *helper_pid_out) |
506 | { |
507 | int new, n; |
508 | char buf[CMSG_SPACE(sizeof(new))]; |
509 | struct msghdr msg; |
510 | struct cmsghdr *cmsg; |
511 | struct iovec iov; |
512 | |
513 | msg.msg_name = NULL; |
514 | msg.msg_namelen = 0; |
515 | iov = ((struct iovec) { .iov_base = helper_pid_out, |
516 | .iov_len = sizeof(*helper_pid_out) }); |
517 | msg.msg_iov = &iov; |
518 | msg.msg_iovlen = 1; |
519 | msg.msg_control = buf; |
520 | msg.msg_controllen = sizeof(buf); |
521 | msg.msg_flags = 0; |
522 | |
523 | n = recvmsg(fd, &msg, 0); |
524 | if (n < 0) |
525 | return -errno; |
526 | else if (n != iov.iov_len) |
527 | *helper_pid_out = -1; |
528 | |
529 | cmsg = CMSG_FIRSTHDR(&msg); |
530 | if (cmsg == NULL) { |
531 | printk(UM_KERN_ERR "rcv_fd didn't receive anything, " |
532 | "error = %d\n" , errno); |
533 | return -1; |
534 | } |
535 | if ((cmsg->cmsg_level != SOL_SOCKET) || |
536 | (cmsg->cmsg_type != SCM_RIGHTS)) { |
537 | printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n" ); |
538 | return -1; |
539 | } |
540 | |
541 | new = ((int *) CMSG_DATA(cmsg))[0]; |
542 | return new; |
543 | } |
544 | |
545 | int os_create_unix_socket(const char *file, int len, int close_on_exec) |
546 | { |
547 | struct sockaddr_un addr; |
548 | int sock, err; |
549 | |
550 | sock = socket(PF_UNIX, SOCK_DGRAM, 0); |
551 | if (sock < 0) |
552 | return -errno; |
553 | |
554 | if (close_on_exec) { |
555 | err = os_set_exec_close(fd: sock); |
556 | if (err < 0) |
557 | printk(UM_KERN_ERR "create_unix_socket : " |
558 | "close_on_exec failed, err = %d" , -err); |
559 | } |
560 | |
561 | addr.sun_family = AF_UNIX; |
562 | |
563 | snprintf(addr.sun_path, len, "%s" , file); |
564 | |
565 | err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); |
566 | if (err < 0) |
567 | return -errno; |
568 | |
569 | return sock; |
570 | } |
571 | |
572 | void os_flush_stdout(void) |
573 | { |
574 | fflush(stdout); |
575 | } |
576 | |
577 | int os_lock_file(int fd, int excl) |
578 | { |
579 | int type = excl ? F_WRLCK : F_RDLCK; |
580 | struct flock lock = ((struct flock) { .l_type = type, |
581 | .l_whence = SEEK_SET, |
582 | .l_start = 0, |
583 | .l_len = 0 } ); |
584 | int err, save; |
585 | |
586 | err = fcntl(fd, F_SETLK, &lock); |
587 | if (!err) |
588 | goto out; |
589 | |
590 | save = -errno; |
591 | err = fcntl(fd, F_GETLK, &lock); |
592 | if (err) { |
593 | err = -errno; |
594 | goto out; |
595 | } |
596 | |
597 | printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n" , |
598 | lock.l_pid); |
599 | err = save; |
600 | out: |
601 | return err; |
602 | } |
603 | |
604 | unsigned os_major(unsigned long long dev) |
605 | { |
606 | return major(dev); |
607 | } |
608 | |
609 | unsigned os_minor(unsigned long long dev) |
610 | { |
611 | return minor(dev); |
612 | } |
613 | |
614 | unsigned long long os_makedev(unsigned major, unsigned minor) |
615 | { |
616 | return makedev(major, minor); |
617 | } |
618 | |
619 | int os_falloc_punch(int fd, unsigned long long offset, int len) |
620 | { |
621 | int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len); |
622 | |
623 | if (n < 0) |
624 | return -errno; |
625 | return n; |
626 | } |
627 | |
628 | int os_falloc_zeroes(int fd, unsigned long long offset, int len) |
629 | { |
630 | int n = fallocate(fd, FALLOC_FL_ZERO_RANGE|FALLOC_FL_KEEP_SIZE, offset, len); |
631 | |
632 | if (n < 0) |
633 | return -errno; |
634 | return n; |
635 | } |
636 | |
637 | int os_eventfd(unsigned int initval, int flags) |
638 | { |
639 | int fd = eventfd(initval, flags); |
640 | |
641 | if (fd < 0) |
642 | return -errno; |
643 | return fd; |
644 | } |
645 | |
646 | int os_sendmsg_fds(int fd, const void *buf, unsigned int len, const int *fds, |
647 | unsigned int fds_num) |
648 | { |
649 | struct iovec iov = { |
650 | .iov_base = (void *) buf, |
651 | .iov_len = len, |
652 | }; |
653 | union { |
654 | char control[CMSG_SPACE(sizeof(*fds) * OS_SENDMSG_MAX_FDS)]; |
655 | struct cmsghdr align; |
656 | } u; |
657 | unsigned int fds_size = sizeof(*fds) * fds_num; |
658 | struct msghdr msg = { |
659 | .msg_iov = &iov, |
660 | .msg_iovlen = 1, |
661 | .msg_control = u.control, |
662 | .msg_controllen = CMSG_SPACE(fds_size), |
663 | }; |
664 | struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); |
665 | int err; |
666 | |
667 | if (fds_num > OS_SENDMSG_MAX_FDS) |
668 | return -EINVAL; |
669 | memset(u.control, 0, sizeof(u.control)); |
670 | cmsg->cmsg_level = SOL_SOCKET; |
671 | cmsg->cmsg_type = SCM_RIGHTS; |
672 | cmsg->cmsg_len = CMSG_LEN(fds_size); |
673 | memcpy(CMSG_DATA(cmsg), fds, fds_size); |
674 | err = sendmsg(fd, &msg, 0); |
675 | |
676 | if (err < 0) |
677 | return -errno; |
678 | return err; |
679 | } |
680 | |
681 | int os_poll(unsigned int n, const int *fds) |
682 | { |
683 | /* currently need 2 FDs at most so avoid dynamic allocation */ |
684 | struct pollfd pollfds[2] = {}; |
685 | unsigned int i; |
686 | int ret; |
687 | |
688 | if (n > ARRAY_SIZE(pollfds)) |
689 | return -EINVAL; |
690 | |
691 | for (i = 0; i < n; i++) { |
692 | pollfds[i].fd = fds[i]; |
693 | pollfds[i].events = POLLIN; |
694 | } |
695 | |
696 | ret = poll(pollfds, n, -1); |
697 | if (ret < 0) |
698 | return -errno; |
699 | |
700 | /* Return the index of the available FD */ |
701 | for (i = 0; i < n; i++) { |
702 | if (pollfds[i].revents) |
703 | return i; |
704 | } |
705 | |
706 | return -EIO; |
707 | } |
708 | |