1
2
3
4
5
6#include <stdio.h>
7#include <unistd.h>
8#include <errno.h>
9#include <fcntl.h>
10#include <signal.h>
11#include <sys/ioctl.h>
12#include <sys/mount.h>
13#include <sys/socket.h>
14#include <sys/stat.h>
15#include <sys/un.h>
16#include "os.h"
17
18static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
19{
20 *dst = ((struct uml_stat) {
21 .ust_dev = src->st_dev,
22 .ust_ino = src->st_ino,
23 .ust_mode = src->st_mode,
24 .ust_nlink = src->st_nlink,
25 .ust_uid = src->st_uid,
26 .ust_gid = src->st_gid,
27 .ust_size = src->st_size,
28 .ust_blksize = src->st_blksize,
29 .ust_blocks = src->st_blocks,
30 .ust_atime = src->st_atime,
31 .ust_mtime = src->st_mtime,
32 .ust_ctime = src->st_ctime,
33 });
34}
35
36int os_stat_fd(const int fd, struct uml_stat *ubuf)
37{
38 struct stat64 sbuf;
39 int err;
40
41 CATCH_EINTR(err = fstat64(fd, &sbuf));
42 if (err < 0)
43 return -errno;
44
45 if (ubuf != NULL)
46 copy_stat(ubuf, &sbuf);
47 return err;
48}
49
50int os_stat_file(const char *file_name, struct uml_stat *ubuf)
51{
52 struct stat64 sbuf;
53 int err;
54
55 CATCH_EINTR(err = stat64(file_name, &sbuf));
56 if (err < 0)
57 return -errno;
58
59 if (ubuf != NULL)
60 copy_stat(ubuf, &sbuf);
61 return err;
62}
63
64int os_access(const char *file, int mode)
65{
66 int amode, err;
67
68 amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
69 (mode & OS_ACC_W_OK ? W_OK : 0) |
70 (mode & OS_ACC_X_OK ? X_OK : 0) |
71 (mode & OS_ACC_F_OK ? F_OK : 0);
72
73 err = access(file, amode);
74 if (err < 0)
75 return -errno;
76
77 return 0;
78}
79
80
81int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
82{
83 int err;
84
85 err = ioctl(fd, cmd, arg);
86 if (err < 0)
87 return -errno;
88
89 return err;
90}
91
92
93int os_get_ifname(int fd, char* namebuf)
94{
95 if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
96 return -errno;
97
98 return 0;
99}
100
101int os_set_slip(int fd)
102{
103 int disc, sencap;
104
105 disc = N_SLIP;
106 if (ioctl(fd, TIOCSETD, &disc) < 0)
107 return -errno;
108
109 sencap = 0;
110 if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
111 return -errno;
112
113 return 0;
114}
115
116int os_mode_fd(int fd, int mode)
117{
118 int err;
119
120 CATCH_EINTR(err = fchmod(fd, mode));
121 if (err < 0)
122 return -errno;
123
124 return 0;
125}
126
127int os_file_type(char *file)
128{
129 struct uml_stat buf;
130 int err;
131
132 err = os_stat_file(file, &buf);
133 if (err < 0)
134 return err;
135
136 if (S_ISDIR(buf.ust_mode))
137 return OS_TYPE_DIR;
138 else if (S_ISLNK(buf.ust_mode))
139 return OS_TYPE_SYMLINK;
140 else if (S_ISCHR(buf.ust_mode))
141 return OS_TYPE_CHARDEV;
142 else if (S_ISBLK(buf.ust_mode))
143 return OS_TYPE_BLOCKDEV;
144 else if (S_ISFIFO(buf.ust_mode))
145 return OS_TYPE_FIFO;
146 else if (S_ISSOCK(buf.ust_mode))
147 return OS_TYPE_SOCK;
148 else return OS_TYPE_FILE;
149}
150
151int os_file_mode(const char *file, struct openflags *mode_out)
152{
153 int err;
154
155 *mode_out = OPENFLAGS();
156
157 err = access(file, W_OK);
158 if (err && (errno != EACCES))
159 return -errno;
160 else if (!err)
161 *mode_out = of_write(*mode_out);
162
163 err = access(file, R_OK);
164 if (err && (errno != EACCES))
165 return -errno;
166 else if (!err)
167 *mode_out = of_read(*mode_out);
168
169 return err;
170}
171
172int os_open_file(const char *file, struct openflags flags, int mode)
173{
174 int fd, err, f = 0;
175
176 if (flags.r && flags.w)
177 f = O_RDWR;
178 else if (flags.r)
179 f = O_RDONLY;
180 else if (flags.w)
181 f = O_WRONLY;
182 else f = 0;
183
184 if (flags.s)
185 f |= O_SYNC;
186 if (flags.c)
187 f |= O_CREAT;
188 if (flags.t)
189 f |= O_TRUNC;
190 if (flags.e)
191 f |= O_EXCL;
192 if (flags.a)
193 f |= O_APPEND;
194
195 fd = open64(file, f, mode);
196 if (fd < 0)
197 return -errno;
198
199 if (flags.cl && fcntl(fd, F_SETFD, 1)) {
200 err = -errno;
201 close(fd);
202 return err;
203 }
204
205 return fd;
206}
207
208int os_connect_socket(const char *name)
209{
210 struct sockaddr_un sock;
211 int fd, err;
212
213 sock.sun_family = AF_UNIX;
214 snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
215
216 fd = socket(AF_UNIX, SOCK_STREAM, 0);
217 if (fd < 0) {
218 err = -errno;
219 goto out;
220 }
221
222 err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
223 if (err) {
224 err = -errno;
225 goto out_close;
226 }
227
228 return fd;
229
230out_close:
231 close(fd);
232out:
233 return err;
234}
235
236void os_close_file(int fd)
237{
238 close(fd);
239}
240
241int os_seek_file(int fd, unsigned long long offset)
242{
243 unsigned long long actual;
244
245 actual = lseek64(fd, offset, SEEK_SET);
246 if (actual != offset)
247 return -errno;
248 return 0;
249}
250
251int os_read_file(int fd, void *buf, int len)
252{
253 int n = read(fd, buf, len);
254
255 if (n < 0)
256 return -errno;
257 return n;
258}
259
260int os_write_file(int fd, const void *buf, int len)
261{
262 int n = write(fd, (void *) buf, len);
263
264 if (n < 0)
265 return -errno;
266 return n;
267}
268
269int os_file_size(const char *file, unsigned long long *size_out)
270{
271 struct uml_stat buf;
272 int err;
273
274 err = os_stat_file(file, &buf);
275 if (err < 0) {
276 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
277 -err);
278 return err;
279 }
280
281 if (S_ISBLK(buf.ust_mode)) {
282 int fd;
283 long blocks;
284
285 fd = open(file, O_RDONLY, 0);
286 if (fd < 0) {
287 err = -errno;
288 printk(UM_KERN_ERR "Couldn't open \"%s\", "
289 "errno = %d\n", file, errno);
290 return err;
291 }
292 if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
293 err = -errno;
294 printk(UM_KERN_ERR "Couldn't get the block size of "
295 "\"%s\", errno = %d\n", file, errno);
296 close(fd);
297 return err;
298 }
299 *size_out = ((long long) blocks) * 512;
300 close(fd);
301 }
302 else *size_out = buf.ust_size;
303
304 return 0;
305}
306
307int os_file_modtime(const char *file, unsigned long *modtime)
308{
309 struct uml_stat buf;
310 int err;
311
312 err = os_stat_file(file, &buf);
313 if (err < 0) {
314 printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
315 -err);
316 return err;
317 }
318
319 *modtime = buf.ust_mtime;
320 return 0;
321}
322
323int os_set_exec_close(int fd)
324{
325 int err;
326
327 CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
328
329 if (err < 0)
330 return -errno;
331 return err;
332}
333
334int os_pipe(int *fds, int stream, int close_on_exec)
335{
336 int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
337
338 err = socketpair(AF_UNIX, type, 0, fds);
339 if (err < 0)
340 return -errno;
341
342 if (!close_on_exec)
343 return 0;
344
345 err = os_set_exec_close(fds[0]);
346 if (err < 0)
347 goto error;
348
349 err = os_set_exec_close(fds[1]);
350 if (err < 0)
351 goto error;
352
353 return 0;
354
355 error:
356 printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
357 -err);
358 close(fds[1]);
359 close(fds[0]);
360 return err;
361}
362
363int os_set_fd_async(int fd)
364{
365 int err, flags;
366
367 flags = fcntl(fd, F_GETFL);
368 if (flags < 0)
369 return -errno;
370
371 flags |= O_ASYNC | O_NONBLOCK;
372 if (fcntl(fd, F_SETFL, flags) < 0) {
373 err = -errno;
374 printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
375 "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
376 return err;
377 }
378
379 if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
380 (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
381 err = -errno;
382 printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
383 "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
384 return err;
385 }
386
387 return 0;
388}
389
390int os_clear_fd_async(int fd)
391{
392 int flags;
393
394 flags = fcntl(fd, F_GETFL);
395 if (flags < 0)
396 return -errno;
397
398 flags &= ~(O_ASYNC | O_NONBLOCK);
399 if (fcntl(fd, F_SETFL, flags) < 0)
400 return -errno;
401 return 0;
402}
403
404int os_set_fd_block(int fd, int blocking)
405{
406 int flags;
407
408 flags = fcntl(fd, F_GETFL);
409 if (flags < 0)
410 return -errno;
411
412 if (blocking)
413 flags &= ~O_NONBLOCK;
414 else
415 flags |= O_NONBLOCK;
416
417 if (fcntl(fd, F_SETFL, flags) < 0)
418 return -errno;
419
420 return 0;
421}
422
423int os_accept_connection(int fd)
424{
425 int new;
426
427 new = accept(fd, NULL, 0);
428 if (new < 0)
429 return -errno;
430 return new;
431}
432
433#ifndef SHUT_RD
434#define SHUT_RD 0
435#endif
436
437#ifndef SHUT_WR
438#define SHUT_WR 1
439#endif
440
441#ifndef SHUT_RDWR
442#define SHUT_RDWR 2
443#endif
444
445int os_shutdown_socket(int fd, int r, int w)
446{
447 int what, err;
448
449 if (r && w)
450 what = SHUT_RDWR;
451 else if (r)
452 what = SHUT_RD;
453 else if (w)
454 what = SHUT_WR;
455 else
456 return -EINVAL;
457
458 err = shutdown(fd, what);
459 if (err < 0)
460 return -errno;
461 return 0;
462}
463
464int os_rcv_fd(int fd, int *helper_pid_out)
465{
466 int new, n;
467 char buf[CMSG_SPACE(sizeof(new))];
468 struct msghdr msg;
469 struct cmsghdr *cmsg;
470 struct iovec iov;
471
472 msg.msg_name = NULL;
473 msg.msg_namelen = 0;
474 iov = ((struct iovec) { .iov_base = helper_pid_out,
475 .iov_len = sizeof(*helper_pid_out) });
476 msg.msg_iov = &iov;
477 msg.msg_iovlen = 1;
478 msg.msg_control = buf;
479 msg.msg_controllen = sizeof(buf);
480 msg.msg_flags = 0;
481
482 n = recvmsg(fd, &msg, 0);
483 if (n < 0)
484 return -errno;
485 else if (n != iov.iov_len)
486 *helper_pid_out = -1;
487
488 cmsg = CMSG_FIRSTHDR(&msg);
489 if (cmsg == NULL) {
490 printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
491 "error = %d\n", errno);
492 return -1;
493 }
494 if ((cmsg->cmsg_level != SOL_SOCKET) ||
495 (cmsg->cmsg_type != SCM_RIGHTS)) {
496 printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
497 return -1;
498 }
499
500 new = ((int *) CMSG_DATA(cmsg))[0];
501 return new;
502}
503
504int os_create_unix_socket(const char *file, int len, int close_on_exec)
505{
506 struct sockaddr_un addr;
507 int sock, err;
508
509 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
510 if (sock < 0)
511 return -errno;
512
513 if (close_on_exec) {
514 err = os_set_exec_close(sock);
515 if (err < 0)
516 printk(UM_KERN_ERR "create_unix_socket : "
517 "close_on_exec failed, err = %d", -err);
518 }
519
520 addr.sun_family = AF_UNIX;
521
522 snprintf(addr.sun_path, len, "%s", file);
523
524 err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
525 if (err < 0)
526 return -errno;
527
528 return sock;
529}
530
531void os_flush_stdout(void)
532{
533 fflush(stdout);
534}
535
536int os_lock_file(int fd, int excl)
537{
538 int type = excl ? F_WRLCK : F_RDLCK;
539 struct flock lock = ((struct flock) { .l_type = type,
540 .l_whence = SEEK_SET,
541 .l_start = 0,
542 .l_len = 0 } );
543 int err, save;
544
545 err = fcntl(fd, F_SETLK, &lock);
546 if (!err)
547 goto out;
548
549 save = -errno;
550 err = fcntl(fd, F_GETLK, &lock);
551 if (err) {
552 err = -errno;
553 goto out;
554 }
555
556 printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
557 lock.l_pid);
558 err = save;
559 out:
560 return err;
561}
562
563unsigned os_major(unsigned long long dev)
564{
565 return major(dev);
566}
567
568unsigned os_minor(unsigned long long dev)
569{
570 return minor(dev);
571}
572
573unsigned long long os_makedev(unsigned major, unsigned minor)
574{
575 return makedev(major, minor);
576}
577
