modules: correct dependencies / version declarations
[dragonfly.git] / sbin / umount / umount.c
blob015dfe55a7615dceb3b2c44f6138f5568799bb92
1 /*-
2 * Copyright (c) 1980, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
33 * @(#) Copyright (c) 1980, 1989, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)umount.c 8.8 (Berkeley) 5/8/95
35 * $FreeBSD: src/sbin/umount/umount.c,v 1.28 2001/10/13 02:04:54 iedowse Exp $
36 * $DragonFly: src/sbin/umount/umount.c,v 1.4 2005/11/06 12:51:01 swildner Exp $
39 #include <sys/param.h>
40 #include <sys/mount.h>
41 #include <sys/socket.h>
43 #include <netdb.h>
44 #include <rpc/rpc.h>
45 #include <nfs/rpcv2.h>
47 #include <err.h>
48 #include <fstab.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
54 #include "mounttab.h"
56 #define ISDOT(x) ((x)[0] == '.' && (x)[1] == '\0')
57 #define ISDOTDOT(x) ((x)[0] == '.' && (x)[1] == '.' && (x)[2] == '\0')
59 typedef enum { MNTON, MNTFROM, NOTHING } mntwhat;
60 typedef enum { MARK, UNMARK, NAME, COUNT, FREE } dowhat;
62 struct addrinfo *nfshost_ai = NULL;
63 int fflag, vflag;
64 char *nfshost;
66 void checkmntlist (char *, char **, char **, char **);
67 int checkvfsname (const char *, char **);
68 char *getmntname (const char *, const char *,
69 mntwhat, char **, dowhat);
70 char *getrealname(char *, char *resolved_path);
71 char **makevfslist (const char *);
72 int mntinfo (struct statfs **);
73 int namematch (struct addrinfo *);
74 int sacmp (struct sockaddr *, struct sockaddr *);
75 int umountall (char **);
76 int checkname (char *, char **);
77 int umountfs (char *, char *, char *);
78 void usage (void);
79 int xdr_dir (XDR *, char *);
81 int
82 main(int argc, char *argv[])
84 int all, errs, ch, mntsize, error;
85 char **typelist = NULL, *mntonname, *mntfromname;
86 char *type, *mntfromnamerev, *mntonnamerev;
87 struct statfs *mntbuf;
88 struct addrinfo hints;
90 /* Start disks transferring immediately. */
91 sync();
93 all = errs = 0;
94 while ((ch = getopt(argc, argv, "Aafh:t:v")) != -1)
95 switch (ch) {
96 case 'A':
97 all = 2;
98 break;
99 case 'a':
100 all = 1;
101 break;
102 case 'f':
103 fflag = MNT_FORCE;
104 break;
105 case 'h': /* -h implies -A. */
106 all = 2;
107 nfshost = optarg;
108 break;
109 case 't':
110 if (typelist != NULL)
111 err(1, "only one -t option may be specified");
112 typelist = makevfslist(optarg);
113 break;
114 case 'v':
115 vflag = 1;
116 break;
117 default:
118 usage();
119 /* NOTREACHED */
121 argc -= optind;
122 argv += optind;
124 if ((argc == 0 && !all) || (argc != 0 && all))
125 usage();
127 /* -h implies "-t nfs" if no -t flag. */
128 if ((nfshost != NULL) && (typelist == NULL))
129 typelist = makevfslist("nfs");
131 if (nfshost != NULL) {
132 memset(&hints, 0, sizeof hints);
133 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
134 if (error)
135 errx(1, "%s: %s", nfshost, gai_strerror(error));
138 switch (all) {
139 case 2:
140 if ((mntsize = mntinfo(&mntbuf)) <= 0)
141 break;
143 * We unmount the nfs-mounts in the reverse order
144 * that they were mounted.
146 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
147 if (checkvfsname(mntbuf[mntsize].f_fstypename,
148 typelist))
149 continue;
151 * Check if a mountpoint is laid over by another mount.
152 * A warning will be printed to stderr if this is
153 * the case. The laid over mount remains unmounted.
155 mntonname = mntbuf[mntsize].f_mntonname;
156 mntfromname = mntbuf[mntsize].f_mntfromname;
157 mntonnamerev = getmntname(getmntname(mntonname,
158 NULL, MNTFROM, &type, NAME), NULL,
159 MNTON, &type, NAME);
161 mntfromnamerev = getmntname(mntonnamerev,
162 NULL, MNTFROM, &type, NAME);
164 if (strcmp(mntonnamerev, mntonname) == 0 &&
165 strcmp(mntfromnamerev, mntfromname ) != 0)
166 warnx("cannot umount %s, %s\n "
167 "is mounted there, umount it first",
168 mntonname, mntfromnamerev);
170 if (checkname(mntbuf[mntsize].f_mntonname,
171 typelist) != 0)
172 errs = 1;
174 free(mntbuf);
175 break;
176 case 1:
177 if (setfsent() == 0)
178 err(1, "%s", _PATH_FSTAB);
179 errs = umountall(typelist);
180 break;
181 case 0:
182 for (errs = 0; *argv != NULL; ++argv)
183 if (checkname(*argv, typelist) != 0)
184 errs = 1;
185 break;
187 getmntname(NULL, NULL, NOTHING, NULL, FREE);
188 exit(errs);
192 umountall(char **typelist)
194 struct vfsconf vfc;
195 struct fstab *fs;
196 int rval;
197 char *cp;
198 static int firstcall = 1;
200 if ((fs = getfsent()) != NULL)
201 firstcall = 0;
202 else if (firstcall)
203 errx(1, "fstab reading failure");
204 else
205 return (0);
206 do {
207 /* Ignore the root. */
208 if (strcmp(fs->fs_file, "/") == 0)
209 continue;
211 * !!!
212 * Historic practice: ignore unknown FSTAB_* fields.
214 if (strcmp(fs->fs_type, FSTAB_RW) &&
215 strcmp(fs->fs_type, FSTAB_RO) &&
216 strcmp(fs->fs_type, FSTAB_RQ))
217 continue;
218 /* Ignore unknown file system types. */
219 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
220 continue;
221 if (checkvfsname(fs->fs_vfstype, typelist))
222 continue;
225 * We want to unmount the file systems in the reverse order
226 * that they were mounted. So, we save off the file name
227 * in some allocated memory, and then call recursively.
229 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
230 err(1, "malloc failed");
231 strcpy(cp, fs->fs_file);
232 rval = umountall(typelist);
233 rval = checkname(cp, typelist) || rval;
234 free(cp);
235 return (rval);
236 } while ((fs = getfsent()) != NULL);
237 return (0);
241 * Do magic checks on mountpoint and device or hand over
242 * it to unmount(2) if everything fails.
245 checkname(char *name, char **typelist)
247 size_t len;
248 int speclen;
249 char *mntonname, *mntfromname;
250 char *mntfromnamerev;
251 char *resolved, realname[MAXPATHLEN];
252 char *type, *hostp, *delimp, *origname;
253 char none[] = "none";
255 len = 0;
256 mntfromname = mntonname = delimp = hostp = NULL;
259 * 1. Check if the name exists in the mounttable.
261 checkmntlist(name, &mntfromname, &mntonname, &type);
262 if (mntfromname == NULL && mntonname == NULL) {
263 checkmntlist(getdevpath(name, 0), &mntfromname,
264 &mntonname, &type);
268 * 2. Remove trailing slashes if there are any. After that
269 * we look up the name in the mounttable again.
271 if (mntfromname == NULL && mntonname == NULL) {
272 speclen = strlen(name);
273 for (speclen = strlen(name);
274 speclen > 1 && name[speclen - 1] == '/';
275 speclen--)
276 name[speclen - 1] = '\0';
277 checkmntlist(name, &mntfromname, &mntonname, &type);
278 resolved = name;
279 /* Save off original name in origname */
280 if ((origname = strdup(name)) == NULL)
281 err(1, "strdup");
283 * 3. Check if the deprecated nfs-syntax with an '@'
284 * has been used and translate it to the ':' syntax.
285 * Look up the name in the mounttable again.
287 if (mntfromname == NULL && mntonname == NULL) {
288 if ((delimp = strrchr(name, '@')) != NULL) {
289 hostp = delimp + 1;
290 if (*hostp != '\0') {
292 * Make both '@' and ':'
293 * notations equal
295 char *host = strdup(hostp);
296 len = strlen(hostp);
297 if (host == NULL)
298 err(1, "strdup");
299 memmove(name + len + 1, name,
300 (size_t)(delimp - name));
301 name[len] = ':';
302 memmove(name, host, len);
303 free(host);
305 for (speclen = strlen(name);
306 speclen > 1 && name[speclen - 1] == '/';
307 speclen--)
308 name[speclen - 1] = '\0';
309 name[len + speclen + 1] = '\0';
310 checkmntlist(name, &mntfromname,
311 &mntonname, &type);
312 resolved = name;
315 * 4. Check if a relative mountpoint has been
316 * specified. This should happen as last check,
317 * the order is important. To prevent possible
318 * nfs-hangs, we just call realpath(3) on the
319 * basedir of mountpoint and add the dirname again.
320 * Check the name in mounttable one last time.
322 if (mntfromname == NULL && mntonname == NULL) {
323 strcpy(name, origname);
324 if ((getrealname(name, realname)) != NULL) {
325 checkmntlist(realname,
326 &mntfromname, &mntonname, &type);
327 resolved = realname;
330 * 5. All tests failed, just hand over the
331 * mountpoint to the kernel, maybe the statfs
332 * structure has been truncated or is not
333 * useful anymore because of a chroot(2).
334 * Please note that nfs will not be able to
335 * notify the nfs-server about unmounting.
336 * These things can change in future when the
337 * fstat structure get's more reliable,
338 * but at the moment we cannot thrust it.
340 if (mntfromname == NULL && mntonname == NULL) {
341 strcpy(name, origname);
342 if (umountfs(NULL, origname,
343 none) == 0) {;
344 warnx("%s not found in "
345 "mount table, "
346 "unmounted it anyway",
347 origname);
348 free(origname);
349 return (0);
350 } else
351 free(origname);
352 return (1);
356 free(origname);
357 } else
358 resolved = name;
360 if (checkvfsname(type, typelist))
361 return (1);
364 * Check if the reverse entrys of the mounttable are really the
365 * same as the normal ones.
367 if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname,
368 NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL)
369 err(1, "strdup");
371 * Mark the uppermost mount as unmounted.
373 getmntname(mntfromname, mntonname, NOTHING, &type, MARK);
375 * If several equal mounts are in the mounttable, check the order
376 * and warn the user if necessary.
378 if (strcmp(mntfromnamerev, mntfromname ) != 0 &&
379 strcmp(resolved, mntonname) != 0) {
380 warnx("cannot umount %s, %s\n "
381 "is mounted there, umount it first",
382 mntonname, mntfromnamerev);
384 /* call getmntname again to set mntcheck[i] to 0 */
385 getmntname(mntfromname, mntonname,
386 NOTHING, &type, UNMARK);
387 return (1);
389 free(mntfromnamerev);
390 return (umountfs(mntfromname, mntonname, type));
394 * NFS stuff and unmount(2) call
397 umountfs(char *mntfromname, char *mntonname, char *type)
399 enum clnt_stat clnt_stat;
400 struct timeval try;
401 struct addrinfo *ai, hints;
402 int do_rpc;
403 CLIENT *clp;
404 char *nfsdirname, *orignfsdirname;
405 char *hostp, *delimp;
407 ai = NULL;
408 do_rpc = 0;
409 hostp = NULL;
410 nfsdirname = delimp = orignfsdirname = NULL;
411 memset(&hints, 0, sizeof hints);
413 if (strcmp(type, "nfs") == 0) {
414 if ((nfsdirname = strdup(mntfromname)) == NULL)
415 err(1, "strdup");
416 orignfsdirname = nfsdirname;
417 if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
418 *delimp = '\0';
419 hostp = nfsdirname;
420 getaddrinfo(hostp, NULL, &hints, &ai);
421 if (ai == NULL) {
422 warnx("can't get net id for host");
424 nfsdirname = delimp + 1;
428 * Check if we have to start the rpc-call later.
429 * If there are still identical nfs-names mounted,
430 * we skip the rpc-call. Obviously this has to
431 * happen before unmount(2), but it should happen
432 * after the previous namecheck.
433 * A non-NULL return means that this is the last
434 * mount from mntfromname that is still mounted.
436 if (getmntname(mntfromname, NULL, NOTHING, &type, COUNT)
437 != NULL)
438 do_rpc = 1;
441 if (!namematch(ai))
442 return (1);
443 if (unmount(mntonname, fflag) != 0 ) {
444 warn("unmount of %s failed", mntonname);
445 return (1);
447 if (vflag)
448 printf("%s: unmount from %s\n", mntfromname, mntonname);
450 * Report to mountd-server which nfsname
451 * has been unmounted.
453 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
454 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
455 if (clp == NULL) {
456 warnx("%s: %s", hostp,
457 clnt_spcreateerror("RPCPROG_MNT"));
458 return (1);
460 clp->cl_auth = authsys_create_default();
461 try.tv_sec = 20;
462 try.tv_usec = 0;
463 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, (xdrproc_t)xdr_dir,
464 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
465 if (clnt_stat != RPC_SUCCESS) {
466 warnx("%s: %s", hostp,
467 clnt_sperror(clp, "RPCMNT_UMOUNT"));
468 return (1);
471 * Remove the unmounted entry from /var/db/mounttab.
473 if (read_mtab()) {
474 clean_mtab(hostp, nfsdirname, vflag);
475 if(!write_mtab(vflag))
476 warnx("cannot remove mounttab entry %s:%s",
477 hostp, nfsdirname);
478 free_mtab();
480 free(orignfsdirname);
481 auth_destroy(clp->cl_auth);
482 clnt_destroy(clp);
484 return (0);
487 char *
488 getmntname(const char *fromname, const char *onname,
489 mntwhat what, char **type, dowhat mark)
491 static struct statfs *mntbuf;
492 static int mntsize = 0;
493 static char *mntcheck = NULL;
494 static char *mntcount = NULL;
495 int i, count;
497 if (mntsize <= 0) {
498 if ((mntsize = mntinfo(&mntbuf)) <= 0)
499 return (NULL);
501 if (mntcheck == NULL) {
502 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL ||
503 (mntcount = calloc(mntsize + 1, sizeof(int))) == NULL)
504 err(1, "calloc");
507 * We want to get the file systems in the reverse order
508 * that they were mounted. Mounted and unmounted filesystems
509 * are marked or unmarked in a table called 'mntcheck'.
510 * Unmount(const char *dir, int flags) does only take the
511 * mountpoint as argument, not the destination. If we don't pay
512 * attention to the order, it can happen that a overlaying
513 * filesystem get's unmounted instead of the one the user
514 * has choosen.
516 switch (mark) {
517 case NAME:
518 /* Return only the specific name */
519 for (i = mntsize - 1; i >= 0; i--) {
520 if (fromname != NULL && what == MNTON &&
521 !strcmp(mntbuf[i].f_mntfromname, fromname) &&
522 mntcheck[i] != 1) {
523 if (type)
524 *type = mntbuf[i].f_fstypename;
525 return (mntbuf[i].f_mntonname);
527 if (fromname != NULL && what == MNTFROM &&
528 !strcmp(mntbuf[i].f_mntonname, fromname) &&
529 mntcheck[i] != 1) {
530 if (type)
531 *type = mntbuf[i].f_fstypename;
532 return (mntbuf[i].f_mntfromname);
535 return (NULL);
536 case MARK:
537 /* Mark current mount with '1' and return name */
538 for (i = mntsize - 1; i >= 0; i--) {
539 if (mntcheck[i] == 0 &&
540 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
541 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
542 mntcheck[i] = 1;
543 return (mntbuf[i].f_mntonname);
546 return (NULL);
547 case UNMARK:
548 /* Unmark current mount with '0' and return name */
549 for (i = 0; i < mntsize; i++) {
550 if (mntcheck[i] == 1 &&
551 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
552 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
553 mntcheck[i] = 0;
554 return (mntbuf[i].f_mntonname);
557 return (NULL);
558 case COUNT:
559 /* Count the equal mntfromnames */
560 count = 0;
561 for (i = mntsize - 1; i >= 0; i--) {
562 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)
563 count++;
565 /* Mark the already unmounted mounts and return
566 * mntfromname if count <= 1. Else return NULL.
568 for (i = mntsize - 1; i >= 0; i--) {
569 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0) {
570 if (mntcount[i] == 1)
571 count--;
572 else {
573 mntcount[i] = 1;
574 break;
578 if (count <= 1)
579 return (mntbuf[i].f_mntonname);
580 else
581 return (NULL);
582 case FREE:
583 free(mntbuf);
584 free(mntcheck);
585 free(mntcount);
586 return (NULL);
587 default:
588 return (NULL);
593 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
595 void *p1, *p2;
596 int len;
598 if (sa1->sa_family != sa2->sa_family)
599 return (1);
601 switch (sa1->sa_family) {
602 case AF_INET:
603 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
604 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
605 len = 4;
606 break;
607 case AF_INET6:
608 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
609 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
610 len = 16;
611 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
612 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
613 return (1);
614 break;
615 default:
616 return (1);
619 return memcmp(p1, p2, len);
623 namematch(struct addrinfo *ai)
625 struct addrinfo *aip;
627 if (nfshost == NULL || nfshost_ai == NULL)
628 return (1);
630 while (ai != NULL) {
631 aip = nfshost_ai;
632 while (aip != NULL) {
633 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
634 return (1);
635 aip = aip->ai_next;
637 ai = ai->ai_next;
640 return (0);
643 void
644 checkmntlist(char *name, char **fromname, char **onname, char **type)
647 *fromname = getmntname(name, NULL, MNTFROM, type, NAME);
648 if (*fromname == NULL) {
649 *onname = getmntname(name, NULL, MNTON, type, NAME);
650 if (*onname != NULL)
651 *fromname = name;
652 } else
653 *onname = name;
657 mntinfo(struct statfs **mntbuf)
659 static struct statfs *origbuf;
660 size_t bufsize;
661 int mntsize;
663 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
664 if (mntsize <= 0)
665 return (0);
666 bufsize = (mntsize + 1) * sizeof(struct statfs);
667 if ((origbuf = malloc(bufsize)) == NULL)
668 err(1, "malloc");
669 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
670 *mntbuf = origbuf;
671 return (mntsize);
674 char *
675 getrealname(char *name, char *realname)
677 char *dirname;
678 int havedir;
679 size_t baselen;
680 size_t dirlen;
682 dirname = '\0';
683 havedir = 0;
684 if (*name == '/') {
685 if (ISDOT(name + 1) || ISDOTDOT(name + 1))
686 strcpy(realname, "/");
687 else {
688 if ((dirname = strrchr(name + 1, '/')) == NULL)
689 snprintf(realname, MAXPATHLEN, "%s", name);
690 else
691 havedir = 1;
693 } else {
694 if (ISDOT(name) || ISDOTDOT(name))
695 realpath(name, realname);
696 else {
697 if ((dirname = strrchr(name, '/')) == NULL) {
698 if ((realpath(name, realname)) == NULL)
699 return (NULL);
700 } else
701 havedir = 1;
704 if (havedir) {
705 *dirname++ = '\0';
706 if (ISDOT(dirname)) {
707 *dirname = '\0';
708 if ((realpath(name, realname)) == NULL)
709 return (NULL);
710 } else if (ISDOTDOT(dirname)) {
711 *--dirname = '/';
712 if ((realpath(name, realname)) == NULL)
713 return (NULL);
714 } else {
715 if ((realpath(name, realname)) == NULL)
716 return (NULL);
717 baselen = strlen(realname);
718 dirlen = strlen(dirname);
719 if (baselen + dirlen + 1 > MAXPATHLEN)
720 return (NULL);
721 if (realname[1] == '\0') {
722 memmove(realname + 1, dirname, dirlen);
723 realname[dirlen + 1] = '\0';
724 } else {
725 realname[baselen] = '/';
726 memmove(realname + baselen + 1,
727 dirname, dirlen);
728 realname[baselen + dirlen + 1] = '\0';
732 return (realname);
736 * xdr routines for mount rpc's
739 xdr_dir(XDR *xdrsp, char *dirp)
742 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
745 void
746 usage(void)
749 fprintf(stderr, "%s\n%s\n",
750 "usage: umount [-fv] special | node",
751 " umount -a | -A [-fv] [-h host] [-t type]");
752 exit(1);