1 /*-
2 * Copyright (c) 1980, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)umount.c 8.8 (Berkeley) 5/8/95
30 * $FreeBSD: src/sbin/umount/umount.c,v 1.28 2001/10/13 02:04:54 iedowse Exp $
31 */
32
33 #include <sys/param.h>
34 #include <sys/ioctl.h>
35 #include <sys/mount.h>
36 #include <sys/socket.h>
37 #include <sys/vnioctl.h>
38
39 #include <netdb.h>
40 #include <rpc/rpc.h>
41 #include <vfs/nfs/rpcv2.h>
42
43 #include <err.h>
44 #include <errno.h>
45 #include <fcntl.h>
46 #include <fstab.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <unistd.h>
51
52 #include "mounttab.h"
53
54 #define ISDOT(x) ((x)[0] == '.' && (x)[1] == '\0')
55 #define ISDOTDOT(x) ((x)[0] == '.' && (x)[1] == '.' && (x)[2] == '\0')
56
57 typedef enum { MNTON, MNTFROM, NOTHING } mntwhat;
58 typedef enum { MARK, UNMARK, NAME, COUNT, FREE } dowhat;
59
60 struct addrinfo *nfshost_ai = NULL;
61 int all, dflag, fflag, vflag;
62 char *nfshost;
63
64 void checkmntlist (char *, char **, char **, char **);
65 int checkvfsname (const char *, char **);
66 char *getmntname (const char *, const char *, mntwhat, char **, dowhat);
67 char *getrealname(char *, char *resolved_path);
68 char **makevfslist (const char *);
69 int mntinfo (struct statfs **);
70 int namematch (struct addrinfo *);
71 int sacmp (struct sockaddr *, struct sockaddr *);
72 int umountall (char **);
73 int checkname (char *, char **);
74 int umountfs (char *, char *, char *);
75 void usage (void) __dead2;
76 int vn_detach (const char *);
77 int xdr_dir (XDR *, char *);
78
79 int
main(int argc,char * argv[])80 main(int argc, char *argv[])
81 {
82 int errs, ch, mntsize, error;
83 char **typelist = NULL, *mntonname, *mntfromname;
84 char *type, *mntfromnamerev, *mntonnamerev;
85 struct statfs *mntbuf;
86 struct addrinfo hints;
87
88 all = errs = 0;
89 while ((ch = getopt(argc, argv, "AadF:fh:t:v")) != -1) {
90 switch (ch) {
91 case 'A':
92 all = 2;
93 break;
94 case 'a':
95 all = 1;
96 break;
97 case 'd':
98 dflag = 1;
99 break;
100 case 'F':
101 setfstab(optarg);
102 break;
103 case 'f':
104 fflag = MNT_FORCE;
105 break;
106 case 'h': /* -h implies -A. */
107 all = 2;
108 nfshost = optarg;
109 break;
110 case 't':
111 if (typelist != NULL)
112 err(1, "only one -t option may be specified");
113 typelist = makevfslist(optarg);
114 break;
115 case 'v':
116 vflag = 1;
117 break;
118 default:
119 usage();
120 /* NOTREACHED */
121 }
122 }
123 argc -= optind;
124 argv += optind;
125
126 if ((argc == 0 && !all) || (argc != 0 && all))
127 usage();
128
129 /* -h implies "-t nfs" if no -t flag. */
130 if ((nfshost != NULL) && (typelist == NULL))
131 typelist = makevfslist("nfs");
132
133 if (nfshost != NULL) {
134 memset(&hints, 0, sizeof hints);
135 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
136 if (error)
137 errx(1, "%s: %s", nfshost, gai_strerror(error));
138 }
139
140 switch (all) {
141 case 2:
142 if ((mntsize = mntinfo(&mntbuf)) <= 0)
143 break;
144 /*
145 * We unmount the nfs-mounts in the reverse order
146 * that they were mounted.
147 */
148 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
149 if (checkvfsname(mntbuf[mntsize].f_fstypename,
150 typelist))
151 continue;
152 /*
153 * Check if a mountpoint is laid over by another mount.
154 * A warning will be printed to stderr if this is
155 * the case. The laid over mount remains unmounted.
156 */
157 mntonname = mntbuf[mntsize].f_mntonname;
158 mntfromname = mntbuf[mntsize].f_mntfromname;
159 mntonnamerev = getmntname(getmntname(mntonname,
160 NULL, MNTFROM, &type, NAME), NULL,
161 MNTON, &type, NAME);
162
163 mntfromnamerev = getmntname(mntonnamerev,
164 NULL, MNTFROM, &type, NAME);
165
166 if (strcmp(mntonnamerev, mntonname) == 0 &&
167 strcmp(mntfromnamerev, mntfromname ) != 0)
168 warnx("cannot umount %s, %s\n "
169 "is mounted there, umount it first",
170 mntonname, mntfromnamerev);
171
172 if (checkname(mntbuf[mntsize].f_mntonname,
173 typelist) != 0)
174 errs = 1;
175 }
176 free(mntbuf);
177 break;
178 case 1:
179 if (setfsent() == 0)
180 err(1, "%s", getfstab());
181 errs = umountall(typelist);
182 break;
183 case 0:
184 for (errs = 0; *argv != NULL; ++argv)
185 if (checkname(*argv, typelist) != 0)
186 errs = 1;
187 break;
188 }
189 getmntname(NULL, NULL, NOTHING, NULL, FREE);
190 exit(errs);
191 }
192
193 int
umountall(char ** typelist)194 umountall(char **typelist)
195 {
196 struct vfsconf vfc;
197 struct fstab *fs;
198 int rval;
199 char *cp;
200 static int firstcall = 1;
201
202 if ((fs = getfsent()) != NULL)
203 firstcall = 0;
204 else if (firstcall)
205 errx(1, "fstab reading failure");
206 else
207 return (0);
208 do {
209 /* Ignore the root. */
210 if (strcmp(fs->fs_file, "/") == 0)
211 continue;
212 /*
213 * !!!
214 * Historic practice: ignore unknown FSTAB_* fields.
215 */
216 if (strcmp(fs->fs_type, FSTAB_RW) &&
217 strcmp(fs->fs_type, FSTAB_RO) &&
218 strcmp(fs->fs_type, FSTAB_RQ))
219 continue;
220 /* Ignore unknown file system types. */
221 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
222 continue;
223 if (checkvfsname(fs->fs_vfstype, typelist))
224 continue;
225
226 /*
227 * We want to unmount the file systems in the reverse order
228 * that they were mounted. So, we save off the file name
229 * in some allocated memory, and then call recursively.
230 */
231 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
232 err(1, "malloc failed");
233 strcpy(cp, fs->fs_file);
234 rval = umountall(typelist);
235 rval = checkname(cp, typelist) || rval;
236 free(cp);
237 return (rval);
238 } while ((fs = getfsent()) != NULL);
239 return (0);
240 }
241
242 /*
243 * Do magic checks on mountpoint and device or hand over
244 * it to unmount(2) if everything fails.
245 */
246 int
checkname(char * name,char ** typelist)247 checkname(char *name, char **typelist)
248 {
249 size_t len;
250 int speclen;
251 char *mntonname, *mntfromname;
252 char *mntfromnamerev;
253 char *resolved, realname[MAXPATHLEN];
254 char *type, *hostp, *delimp, *origname;
255 char none[] = "none";
256
257 len = 0;
258 mntfromname = mntonname = delimp = hostp = NULL;
259
260 /*
261 * 1. Check if the name exists in the mounttable.
262 */
263 checkmntlist(name, &mntfromname, &mntonname, &type);
264 if (mntfromname == NULL && mntonname == NULL) {
265 checkmntlist(getdevpath(name, 0), &mntfromname,
266 &mntonname, &type);
267 }
268
269 /*
270 * 2. Remove trailing slashes if there are any. After that
271 * we look up the name in the mounttable again.
272 */
273 if (mntfromname == NULL && mntonname == NULL) {
274 speclen = strlen(name);
275 for (speclen = strlen(name);
276 speclen > 1 && name[speclen - 1] == '/';
277 speclen--)
278 name[speclen - 1] = '\0';
279 checkmntlist(name, &mntfromname, &mntonname, &type);
280 resolved = name;
281 /* Save off original name in origname */
282 if ((origname = strdup(name)) == NULL)
283 err(1, "strdup");
284 /*
285 * 3. Check if the deprecated nfs-syntax with an '@'
286 * has been used and translate it to the ':' syntax.
287 * Look up the name in the mounttable again.
288 */
289 if (mntfromname == NULL && mntonname == NULL) {
290 if ((delimp = strrchr(name, '@')) != NULL) {
291 hostp = delimp + 1;
292 if (*hostp != '\0') {
293 /*
294 * Make both '@' and ':'
295 * notations equal
296 */
297 char *host = strdup(hostp);
298 len = strlen(hostp);
299 if (host == NULL)
300 err(1, "strdup");
301 memmove(name + len + 1, name,
302 (size_t)(delimp - name));
303 name[len] = ':';
304 memmove(name, host, len);
305 free(host);
306 }
307 for (speclen = strlen(name);
308 speclen > 1 && name[speclen - 1] == '/';
309 speclen--)
310 name[speclen - 1] = '\0';
311 name[len + speclen + 1] = '\0';
312 checkmntlist(name, &mntfromname,
313 &mntonname, &type);
314 resolved = name;
315 }
316 /*
317 * 4. Check if a relative mountpoint has been
318 * specified. This should happen as last check,
319 * the order is important. To prevent possible
320 * nfs-hangs, we just call realpath(3) on the
321 * basedir of mountpoint and add the dirname again.
322 * Check the name in mounttable one last time.
323 */
324 if (mntfromname == NULL && mntonname == NULL) {
325 strcpy(name, origname);
326 if ((getrealname(name, realname)) != NULL) {
327 checkmntlist(realname,
328 &mntfromname, &mntonname, &type);
329 resolved = realname;
330 }
331 /*
332 * 5. All tests failed, just hand over the
333 * mountpoint to the kernel, maybe the statfs
334 * structure has been truncated or is not
335 * useful anymore because of a chroot(2).
336 * Please note that nfs will not be able to
337 * notify the nfs-server about unmounting.
338 * These things can change in future when the
339 * fstat structure get's more reliable,
340 * but at the moment we cannot thrust it.
341 */
342 if (mntfromname == NULL && mntonname == NULL) {
343 strcpy(name, origname);
344 if (umountfs(NULL, origname,
345 none) == 0) {
346 warnx("%s not found in "
347 "mount table, "
348 "unmounted it anyway",
349 origname);
350 free(origname);
351 return (0);
352 } else {
353 free(origname);
354 return (1);
355 }
356 }
357 }
358 }
359 free(origname);
360 } else
361 resolved = name;
362
363 if (checkvfsname(type, typelist))
364 return (1);
365
366 /*
367 * Check if the reverse entrys of the mounttable are really the
368 * same as the normal ones.
369 */
370 if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname,
371 NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL)
372 err(1, "strdup");
373 /*
374 * Mark the uppermost mount as unmounted.
375 */
376 getmntname(mntfromname, mntonname, NOTHING, &type, MARK);
377 /*
378 * If several equal mounts are in the mounttable, check the order
379 * and warn the user if necessary.
380 */
381 if (strcmp(mntfromnamerev, mntfromname) != 0 &&
382 strcmp(resolved, mntonname) != 0) {
383 warnx("cannot umount %s, %s\n "
384 "is mounted there, umount it first",
385 mntonname, mntfromnamerev);
386
387 /* call getmntname again to set mntcheck[i] to 0 */
388 getmntname(mntfromname, mntonname,
389 NOTHING, &type, UNMARK);
390 return (1);
391 }
392 free(mntfromnamerev);
393 return (umountfs(mntfromname, mntonname, type));
394 }
395
396 /*
397 * NFS stuff and unmount(2) call
398 */
399 int
umountfs(char * mntfromname,char * mntonname,char * type)400 umountfs(char *mntfromname, char *mntonname, char *type)
401 {
402 enum clnt_stat clnt_stat;
403 struct timeval try;
404 struct addrinfo *ai, hints;
405 int do_rpc;
406 CLIENT *clp;
407 char *nfsdirname, *orignfsdirname;
408 char *hostp, *delimp;
409
410 ai = NULL;
411 do_rpc = 0;
412 hostp = NULL;
413 nfsdirname = delimp = orignfsdirname = NULL;
414 memset(&hints, 0, sizeof hints);
415
416 if (strcmp(type, "nfs") == 0) {
417 if ((nfsdirname = strdup(mntfromname)) == NULL)
418 err(1, "strdup");
419 orignfsdirname = nfsdirname;
420 if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
421 *delimp = '\0';
422 hostp = nfsdirname;
423 getaddrinfo(hostp, NULL, &hints, &ai);
424 if (ai == NULL) {
425 warnx("can't get net id for host");
426 }
427 nfsdirname = delimp + 1;
428 }
429
430 /*
431 * Check if we have to start the rpc-call later.
432 * If there are still identical nfs-names mounted,
433 * we skip the rpc-call. Obviously this has to
434 * happen before unmount(2), but it should happen
435 * after the previous namecheck.
436 * A non-NULL return means that this is the last
437 * mount from mntfromname that is still mounted.
438 */
439 if (getmntname(mntfromname, NULL, NOTHING, &type, COUNT)
440 != NULL)
441 do_rpc = 1;
442 }
443
444 if (!namematch(ai))
445 return (1);
446 if (unmount(mntonname, fflag) != 0 ) {
447 warn("unmount of %s failed", mntonname);
448 return (1);
449 }
450 if (vflag)
451 printf("%s: unmount from %s\n", mntfromname, mntonname);
452 if (dflag) {
453 if (vn_detach(mntfromname) != 0 && !all) {
454 warnx("detach of %s failed", mntfromname);
455 return (1);
456 }
457 }
458
459 /*
460 * Report to mountd-server which nfsname
461 * has been unmounted.
462 */
463 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
464 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
465 if (clp == NULL) {
466 warnx("%s: %s", hostp,
467 clnt_spcreateerror("RPCPROG_MNT"));
468 return (1);
469 }
470 clp->cl_auth = authsys_create_default();
471 try.tv_sec = 20;
472 try.tv_usec = 0;
473 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, (xdrproc_t)xdr_dir,
474 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
475 if (clnt_stat != RPC_SUCCESS) {
476 warnx("%s: %s", hostp,
477 clnt_sperror(clp, "RPCMNT_UMOUNT"));
478 return (1);
479 }
480 /*
481 * Remove the unmounted entry from /var/db/mounttab.
482 */
483 if (read_mtab()) {
484 clean_mtab(hostp, nfsdirname, vflag);
485 if(!write_mtab(vflag))
486 warnx("cannot remove mounttab entry %s:%s",
487 hostp, nfsdirname);
488 free_mtab();
489 }
490 free(orignfsdirname);
491 auth_destroy(clp->cl_auth);
492 clnt_destroy(clp);
493 }
494
495 return (0);
496 }
497
498 int
vn_detach(const char * fromname)499 vn_detach(const char *fromname)
500 {
501 struct vn_ioctl vnio;
502 char *p, device[MAXPATHLEN];
503 int fd;
504
505 if (strncmp(fromname, "/dev/vn", sizeof("/dev/vn") - 1) != 0) {
506 if (!all)
507 warnx("invalid vn device: %s", fromname);
508 return (-1);
509 }
510
511 /* Strip the slice/partition part (e.g., /dev/vn4s1a -> /dev/vn4) */
512 snprintf(device, sizeof(device), "%s", fromname);
513 p = device + sizeof("/dev/vn");
514 while (*p >= '0' && *p <= '9')
515 p++;
516 *p = '\0';
517
518 fd = open(device, O_RDONLY);
519 if (fd < 0) {
520 warn("open: %s", device);
521 return (-1);
522 }
523
524 memset(&vnio, 0, sizeof(vnio));
525 if (ioctl(fd, VNIOCDETACH, &vnio) < 0) {
526 warn("VNIOCDETACH: %s", device);
527 close(fd);
528 return (-1);
529 }
530
531 close(fd);
532 if (vflag)
533 printf("%s: detached\n", device);
534
535 return (0);
536 }
537
538 char *
getmntname(const char * fromname,const char * onname,mntwhat what,char ** type,dowhat mark)539 getmntname(const char *fromname, const char *onname,
540 mntwhat what, char **type, dowhat mark)
541 {
542 static struct statfs *mntbuf;
543 static int mntsize = 0;
544 static char *mntcheck = NULL;
545 static char *mntcount = NULL;
546 int i, count;
547
548 if (mntsize <= 0) {
549 if ((mntsize = mntinfo(&mntbuf)) <= 0)
550 return (NULL);
551 }
552 if (mntcheck == NULL) {
553 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL ||
554 (mntcount = calloc(mntsize + 1, sizeof(int))) == NULL)
555 err(1, "calloc");
556 }
557 /*
558 * We want to get the file systems in the reverse order
559 * that they were mounted. Mounted and unmounted filesystems
560 * are marked or unmarked in a table called 'mntcheck'.
561 * Unmount(const char *dir, int flags) does only take the
562 * mountpoint as argument, not the destination. If we don't pay
563 * attention to the order, it can happen that a overlaying
564 * filesystem get's unmounted instead of the one the user
565 * has choosen.
566 */
567 switch (mark) {
568 case NAME:
569 /* Return only the specific name */
570 for (i = mntsize - 1; i >= 0; i--) {
571 if (fromname != NULL && what == MNTON &&
572 !strcmp(mntbuf[i].f_mntfromname, fromname) &&
573 mntcheck[i] != 1) {
574 if (type)
575 *type = mntbuf[i].f_fstypename;
576 return (mntbuf[i].f_mntonname);
577 }
578 if (fromname != NULL && what == MNTFROM &&
579 !strcmp(mntbuf[i].f_mntonname, fromname) &&
580 mntcheck[i] != 1) {
581 if (type)
582 *type = mntbuf[i].f_fstypename;
583 return (mntbuf[i].f_mntfromname);
584 }
585 }
586 return (NULL);
587 case MARK:
588 /* Mark current mount with '1' and return name */
589 for (i = mntsize - 1; i >= 0; i--) {
590 if (mntcheck[i] == 0 &&
591 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
592 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
593 mntcheck[i] = 1;
594 return (mntbuf[i].f_mntonname);
595 }
596 }
597 return (NULL);
598 case UNMARK:
599 /* Unmark current mount with '0' and return name */
600 for (i = 0; i < mntsize; i++) {
601 if (mntcheck[i] == 1 &&
602 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
603 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
604 mntcheck[i] = 0;
605 return (mntbuf[i].f_mntonname);
606 }
607 }
608 return (NULL);
609 case COUNT:
610 /* Count the equal mntfromnames */
611 count = 0;
612 for (i = mntsize - 1; i >= 0; i--) {
613 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)
614 count++;
615 }
616 /* Mark the already unmounted mounts and return
617 * mntfromname if count <= 1. Else return NULL.
618 */
619 for (i = mntsize - 1; i >= 0; i--) {
620 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0) {
621 if (mntcount[i] == 1)
622 count--;
623 else {
624 mntcount[i] = 1;
625 break;
626 }
627 }
628 }
629 if (count <= 1)
630 return (mntbuf[i].f_mntonname);
631 else
632 return (NULL);
633 case FREE:
634 free(mntbuf);
635 free(mntcheck);
636 free(mntcount);
637 return (NULL);
638 default:
639 return (NULL);
640 }
641 }
642
643 int
sacmp(struct sockaddr * sa1,struct sockaddr * sa2)644 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
645 {
646 void *p1, *p2;
647 int len;
648
649 if (sa1->sa_family != sa2->sa_family)
650 return (1);
651
652 switch (sa1->sa_family) {
653 case AF_INET:
654 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
655 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
656 len = 4;
657 break;
658 case AF_INET6:
659 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
660 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
661 len = 16;
662 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
663 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
664 return (1);
665 break;
666 default:
667 return (1);
668 }
669
670 return memcmp(p1, p2, len);
671 }
672
673 int
namematch(struct addrinfo * ai)674 namematch(struct addrinfo *ai)
675 {
676 struct addrinfo *aip;
677
678 if (nfshost == NULL || nfshost_ai == NULL)
679 return (1);
680
681 while (ai != NULL) {
682 aip = nfshost_ai;
683 while (aip != NULL) {
684 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
685 return (1);
686 aip = aip->ai_next;
687 }
688 ai = ai->ai_next;
689 }
690
691 return (0);
692 }
693
694 void
checkmntlist(char * name,char ** fromname,char ** onname,char ** type)695 checkmntlist(char *name, char **fromname, char **onname, char **type)
696 {
697
698 *fromname = getmntname(name, NULL, MNTFROM, type, NAME);
699 if (*fromname == NULL) {
700 *onname = getmntname(name, NULL, MNTON, type, NAME);
701 if (*onname != NULL)
702 *fromname = name;
703 } else
704 *onname = name;
705 }
706
707 int
mntinfo(struct statfs ** mntbuf)708 mntinfo(struct statfs **mntbuf)
709 {
710 static struct statfs *origbuf;
711 size_t bufsize;
712 int mntsize;
713
714 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
715 if (mntsize <= 0)
716 return (0);
717 bufsize = (mntsize + 1) * sizeof(struct statfs);
718 if ((origbuf = malloc(bufsize)) == NULL)
719 err(1, "malloc");
720 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
721 *mntbuf = origbuf;
722 return (mntsize);
723 }
724
725 char *
getrealname(char * name,char * realname)726 getrealname(char *name, char *realname)
727 {
728 char *dirname;
729 int havedir;
730 size_t baselen;
731 size_t dirlen;
732
733 dirname = NULL;
734 havedir = 0;
735 if (*name == '/') {
736 if (ISDOT(name + 1) || ISDOTDOT(name + 1))
737 strcpy(realname, "/");
738 else {
739 if ((dirname = strrchr(name + 1, '/')) == NULL)
740 snprintf(realname, MAXPATHLEN, "%s", name);
741 else
742 havedir = 1;
743 }
744 } else {
745 if (ISDOT(name) || ISDOTDOT(name))
746 realpath(name, realname);
747 else {
748 if ((dirname = strrchr(name, '/')) == NULL) {
749 if ((realpath(name, realname)) == NULL)
750 return (NULL);
751 } else
752 havedir = 1;
753 }
754 }
755 if (havedir) {
756 *dirname++ = '\0';
757 if (ISDOT(dirname)) {
758 *dirname = '\0';
759 if ((realpath(name, realname)) == NULL)
760 return (NULL);
761 } else if (ISDOTDOT(dirname)) {
762 *--dirname = '/';
763 if ((realpath(name, realname)) == NULL)
764 return (NULL);
765 } else {
766 if ((realpath(name, realname)) == NULL)
767 return (NULL);
768 baselen = strlen(realname);
769 dirlen = strlen(dirname);
770 if (baselen + dirlen + 1 > MAXPATHLEN)
771 return (NULL);
772 if (realname[1] == '\0') {
773 memmove(realname + 1, dirname, dirlen);
774 realname[dirlen + 1] = '\0';
775 } else {
776 realname[baselen] = '/';
777 memmove(realname + baselen + 1,
778 dirname, dirlen);
779 realname[baselen + dirlen + 1] = '\0';
780 }
781 }
782 }
783 return (realname);
784 }
785
786 /*
787 * xdr routines for mount rpc's
788 */
789 int
xdr_dir(XDR * xdrsp,char * dirp)790 xdr_dir(XDR *xdrsp, char *dirp)
791 {
792
793 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
794 }
795
796 void
usage(void)797 usage(void)
798 {
799
800 fprintf(stderr, "%s\n%s\n",
801 "usage: umount [-dfv] special | node",
802 " umount -a | -A [-F fstab] [-dfv] [-h host] [-t type]");
803 exit(1);
804 }
805