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
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
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>
45 #include <nfs/rpcv2.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;
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 *);
79 int xdr_dir (XDR *, char *);
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;
91 while ((ch = getopt(argc, argv, "Aafh:t:v")) != -1) {
102 case 'h': /* -h implies -A. */
107 if (typelist != NULL)
108 err(1, "only one -t option may be specified");
109 typelist = makevfslist(optarg);
122 if ((argc == 0 && !all) || (argc != 0 && all))
125 /* -h implies "-t nfs" if no -t flag. */
126 if ((nfshost != NULL) && (typelist == NULL))
127 typelist = makevfslist("nfs");
129 if (nfshost != NULL) {
130 memset(&hints, 0, sizeof hints);
131 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
133 errx(1, "%s: %s", nfshost, gai_strerror(error));
138 if ((mntsize = mntinfo(&mntbuf)) <= 0)
141 * We unmount the nfs-mounts in the reverse order
142 * that they were mounted.
144 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
145 if (checkvfsname(mntbuf[mntsize].f_fstypename,
149 * Check if a mountpoint is laid over by another mount.
150 * A warning will be printed to stderr if this is
151 * the case. The laid over mount remains unmounted.
153 mntonname = mntbuf[mntsize].f_mntonname;
154 mntfromname = mntbuf[mntsize].f_mntfromname;
155 mntonnamerev = getmntname(getmntname(mntonname,
156 NULL, MNTFROM, &type, NAME), NULL,
159 mntfromnamerev = getmntname(mntonnamerev,
160 NULL, MNTFROM, &type, NAME);
162 if (strcmp(mntonnamerev, mntonname) == 0 &&
163 strcmp(mntfromnamerev, mntfromname ) != 0)
164 warnx("cannot umount %s, %s\n "
165 "is mounted there, umount it first",
166 mntonname, mntfromnamerev);
168 if (checkname(mntbuf[mntsize].f_mntonname,
176 err(1, "%s", _PATH_FSTAB);
177 errs = umountall(typelist);
180 for (errs = 0; *argv != NULL; ++argv)
181 if (checkname(*argv, typelist) != 0)
185 getmntname(NULL, NULL, NOTHING, NULL, FREE);
190 umountall(char **typelist)
196 static int firstcall = 1;
198 if ((fs = getfsent()) != NULL)
201 errx(1, "fstab reading failure");
205 /* Ignore the root. */
206 if (strcmp(fs->fs_file, "/") == 0)
210 * Historic practice: ignore unknown FSTAB_* fields.
212 if (strcmp(fs->fs_type, FSTAB_RW) &&
213 strcmp(fs->fs_type, FSTAB_RO) &&
214 strcmp(fs->fs_type, FSTAB_RQ))
216 /* Ignore unknown file system types. */
217 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
219 if (checkvfsname(fs->fs_vfstype, typelist))
223 * We want to unmount the file systems in the reverse order
224 * that they were mounted. So, we save off the file name
225 * in some allocated memory, and then call recursively.
227 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
228 err(1, "malloc failed");
229 strcpy(cp, fs->fs_file);
230 rval = umountall(typelist);
231 rval = checkname(cp, typelist) || rval;
234 } while ((fs = getfsent()) != NULL);
239 * Do magic checks on mountpoint and device or hand over
240 * it to unmount(2) if everything fails.
243 checkname(char *name, char **typelist)
247 char *mntonname, *mntfromname;
248 char *mntfromnamerev;
249 char *resolved, realname[MAXPATHLEN];
250 char *type, *hostp, *delimp, *origname;
251 char none[] = "none";
254 mntfromname = mntonname = delimp = hostp = NULL;
257 * 1. Check if the name exists in the mounttable.
259 checkmntlist(name, &mntfromname, &mntonname, &type);
260 if (mntfromname == NULL && mntonname == NULL) {
261 checkmntlist(getdevpath(name, 0), &mntfromname,
266 * 2. Remove trailing slashes if there are any. After that
267 * we look up the name in the mounttable again.
269 if (mntfromname == NULL && mntonname == NULL) {
270 speclen = strlen(name);
271 for (speclen = strlen(name);
272 speclen > 1 && name[speclen - 1] == '/';
274 name[speclen - 1] = '\0';
275 checkmntlist(name, &mntfromname, &mntonname, &type);
277 /* Save off original name in origname */
278 if ((origname = strdup(name)) == NULL)
281 * 3. Check if the deprecated nfs-syntax with an '@'
282 * has been used and translate it to the ':' syntax.
283 * Look up the name in the mounttable again.
285 if (mntfromname == NULL && mntonname == NULL) {
286 if ((delimp = strrchr(name, '@')) != NULL) {
288 if (*hostp != '\0') {
290 * Make both '@' and ':'
293 char *host = strdup(hostp);
297 memmove(name + len + 1, name,
298 (size_t)(delimp - name));
300 memmove(name, host, len);
303 for (speclen = strlen(name);
304 speclen > 1 && name[speclen - 1] == '/';
306 name[speclen - 1] = '\0';
307 name[len + speclen + 1] = '\0';
308 checkmntlist(name, &mntfromname,
313 * 4. Check if a relative mountpoint has been
314 * specified. This should happen as last check,
315 * the order is important. To prevent possible
316 * nfs-hangs, we just call realpath(3) on the
317 * basedir of mountpoint and add the dirname again.
318 * Check the name in mounttable one last time.
320 if (mntfromname == NULL && mntonname == NULL) {
321 strcpy(name, origname);
322 if ((getrealname(name, realname)) != NULL) {
323 checkmntlist(realname,
324 &mntfromname, &mntonname, &type);
328 * 5. All tests failed, just hand over the
329 * mountpoint to the kernel, maybe the statfs
330 * structure has been truncated or is not
331 * useful anymore because of a chroot(2).
332 * Please note that nfs will not be able to
333 * notify the nfs-server about unmounting.
334 * These things can change in future when the
335 * fstat structure get's more reliable,
336 * but at the moment we cannot thrust it.
338 if (mntfromname == NULL && mntonname == NULL) {
339 strcpy(name, origname);
340 if (umountfs(NULL, origname,
342 warnx("%s not found in "
344 "unmounted it anyway",
358 if (checkvfsname(type, typelist))
362 * Check if the reverse entrys of the mounttable are really the
363 * same as the normal ones.
365 if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname,
366 NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL)
369 * Mark the uppermost mount as unmounted.
371 getmntname(mntfromname, mntonname, NOTHING, &type, MARK);
373 * If several equal mounts are in the mounttable, check the order
374 * and warn the user if necessary.
376 if (strcmp(mntfromnamerev, mntfromname ) != 0 &&
377 strcmp(resolved, mntonname) != 0) {
378 warnx("cannot umount %s, %s\n "
379 "is mounted there, umount it first",
380 mntonname, mntfromnamerev);
382 /* call getmntname again to set mntcheck[i] to 0 */
383 getmntname(mntfromname, mntonname,
384 NOTHING, &type, UNMARK);
387 free(mntfromnamerev);
388 return (umountfs(mntfromname, mntonname, type));
392 * NFS stuff and unmount(2) call
395 umountfs(char *mntfromname, char *mntonname, char *type)
397 enum clnt_stat clnt_stat;
399 struct addrinfo *ai, hints;
402 char *nfsdirname, *orignfsdirname;
403 char *hostp, *delimp;
408 nfsdirname = delimp = orignfsdirname = NULL;
409 memset(&hints, 0, sizeof hints);
411 if (strcmp(type, "nfs") == 0) {
412 if ((nfsdirname = strdup(mntfromname)) == NULL)
414 orignfsdirname = nfsdirname;
415 if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
418 getaddrinfo(hostp, NULL, &hints, &ai);
420 warnx("can't get net id for host");
422 nfsdirname = delimp + 1;
426 * Check if we have to start the rpc-call later.
427 * If there are still identical nfs-names mounted,
428 * we skip the rpc-call. Obviously this has to
429 * happen before unmount(2), but it should happen
430 * after the previous namecheck.
431 * A non-NULL return means that this is the last
432 * mount from mntfromname that is still mounted.
434 if (getmntname(mntfromname, NULL, NOTHING, &type, COUNT)
441 if (unmount(mntonname, fflag) != 0 ) {
442 warn("unmount of %s failed", mntonname);
446 printf("%s: unmount from %s\n", mntfromname, mntonname);
448 * Report to mountd-server which nfsname
449 * has been unmounted.
451 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
452 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
454 warnx("%s: %s", hostp,
455 clnt_spcreateerror("RPCPROG_MNT"));
458 clp->cl_auth = authsys_create_default();
461 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, (xdrproc_t)xdr_dir,
462 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
463 if (clnt_stat != RPC_SUCCESS) {
464 warnx("%s: %s", hostp,
465 clnt_sperror(clp, "RPCMNT_UMOUNT"));
469 * Remove the unmounted entry from /var/db/mounttab.
472 clean_mtab(hostp, nfsdirname, vflag);
473 if(!write_mtab(vflag))
474 warnx("cannot remove mounttab entry %s:%s",
478 free(orignfsdirname);
479 auth_destroy(clp->cl_auth);
486 getmntname(const char *fromname, const char *onname,
487 mntwhat what, char **type, dowhat mark)
489 static struct statfs *mntbuf;
490 static int mntsize = 0;
491 static char *mntcheck = NULL;
492 static char *mntcount = NULL;
496 if ((mntsize = mntinfo(&mntbuf)) <= 0)
499 if (mntcheck == NULL) {
500 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL ||
501 (mntcount = calloc(mntsize + 1, sizeof(int))) == NULL)
505 * We want to get the file systems in the reverse order
506 * that they were mounted. Mounted and unmounted filesystems
507 * are marked or unmarked in a table called 'mntcheck'.
508 * Unmount(const char *dir, int flags) does only take the
509 * mountpoint as argument, not the destination. If we don't pay
510 * attention to the order, it can happen that a overlaying
511 * filesystem get's unmounted instead of the one the user
516 /* Return only the specific name */
517 for (i = mntsize - 1; i >= 0; i--) {
518 if (fromname != NULL && what == MNTON &&
519 !strcmp(mntbuf[i].f_mntfromname, fromname) &&
522 *type = mntbuf[i].f_fstypename;
523 return (mntbuf[i].f_mntonname);
525 if (fromname != NULL && what == MNTFROM &&
526 !strcmp(mntbuf[i].f_mntonname, fromname) &&
529 *type = mntbuf[i].f_fstypename;
530 return (mntbuf[i].f_mntfromname);
535 /* Mark current mount with '1' and return name */
536 for (i = mntsize - 1; i >= 0; i--) {
537 if (mntcheck[i] == 0 &&
538 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
539 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
541 return (mntbuf[i].f_mntonname);
546 /* Unmark current mount with '0' and return name */
547 for (i = 0; i < mntsize; i++) {
548 if (mntcheck[i] == 1 &&
549 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
550 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
552 return (mntbuf[i].f_mntonname);
557 /* Count the equal mntfromnames */
559 for (i = mntsize - 1; i >= 0; i--) {
560 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)
563 /* Mark the already unmounted mounts and return
564 * mntfromname if count <= 1. Else return NULL.
566 for (i = mntsize - 1; i >= 0; i--) {
567 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0) {
568 if (mntcount[i] == 1)
577 return (mntbuf[i].f_mntonname);
591 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
596 if (sa1->sa_family != sa2->sa_family)
599 switch (sa1->sa_family) {
601 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
602 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
606 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
607 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
609 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
610 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
617 return memcmp(p1, p2, len);
621 namematch(struct addrinfo *ai)
623 struct addrinfo *aip;
625 if (nfshost == NULL || nfshost_ai == NULL)
630 while (aip != NULL) {
631 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
642 checkmntlist(char *name, char **fromname, char **onname, char **type)
645 *fromname = getmntname(name, NULL, MNTFROM, type, NAME);
646 if (*fromname == NULL) {
647 *onname = getmntname(name, NULL, MNTON, type, NAME);
655 mntinfo(struct statfs **mntbuf)
657 static struct statfs *origbuf;
661 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
664 bufsize = (mntsize + 1) * sizeof(struct statfs);
665 if ((origbuf = malloc(bufsize)) == NULL)
667 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
673 getrealname(char *name, char *realname)
683 if (ISDOT(name + 1) || ISDOTDOT(name + 1))
684 strcpy(realname, "/");
686 if ((dirname = strrchr(name + 1, '/')) == NULL)
687 snprintf(realname, MAXPATHLEN, "%s", name);
692 if (ISDOT(name) || ISDOTDOT(name))
693 realpath(name, realname);
695 if ((dirname = strrchr(name, '/')) == NULL) {
696 if ((realpath(name, realname)) == NULL)
704 if (ISDOT(dirname)) {
706 if ((realpath(name, realname)) == NULL)
708 } else if (ISDOTDOT(dirname)) {
710 if ((realpath(name, realname)) == NULL)
713 if ((realpath(name, realname)) == NULL)
715 baselen = strlen(realname);
716 dirlen = strlen(dirname);
717 if (baselen + dirlen + 1 > MAXPATHLEN)
719 if (realname[1] == '\0') {
720 memmove(realname + 1, dirname, dirlen);
721 realname[dirlen + 1] = '\0';
723 realname[baselen] = '/';
724 memmove(realname + baselen + 1,
726 realname[baselen + dirlen + 1] = '\0';
734 * xdr routines for mount rpc's
737 xdr_dir(XDR *xdrsp, char *dirp)
740 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
747 fprintf(stderr, "%s\n%s\n",
748 "usage: umount [-fv] special | node",
749 " umount -a | -A [-fv] [-h host] [-t type]");