umount(8): Raise WARNS to 6 and fix all warnings.
[dragonfly.git] / sbin / umount / umount.c
CommitLineData
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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. 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.
20 *
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.
1de703da
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32 *
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
ce0e08e2 35 * $FreeBSD: src/sbin/umount/umount.c,v 1.28 2001/10/13 02:04:54 iedowse Exp $
80655324 36 * $DragonFly: src/sbin/umount/umount.c,v 1.4 2005/11/06 12:51:01 swildner Exp $
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37 */
38
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39#include <sys/param.h>
40#include <sys/mount.h>
ce0e08e2 41#include <sys/socket.h>
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42
43#include <netdb.h>
44#include <rpc/rpc.h>
45#include <nfs/rpcv2.h>
46
47#include <err.h>
48#include <fstab.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53
54#include "mounttab.h"
55
56#define ISDOT(x) ((x)[0] == '.' && (x)[1] == '\0')
57#define ISDOTDOT(x) ((x)[0] == '.' && (x)[1] == '.' && (x)[2] == '\0')
58
59typedef enum { MNTON, MNTFROM, NOTHING } mntwhat;
60typedef enum { MARK, UNMARK, NAME, COUNT, FREE } dowhat;
61
ce0e08e2 62struct addrinfo *nfshost_ai = NULL;
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63int fflag, vflag;
64char *nfshost;
65
66void checkmntlist (char *, char **, char **, char **);
67int checkvfsname (const char *, char **);
68char *getmntname (const char *, const char *,
69 mntwhat, char **, dowhat);
70char *getrealname(char *, char *resolved_path);
71char **makevfslist (const char *);
b0d1987f 72int mntinfo (struct statfs **);
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73int namematch (struct addrinfo *);
74int sacmp (struct sockaddr *, struct sockaddr *);
984263bc 75int umountall (char **);
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76int checkname (char *, char **);
77int umountfs (char *, char *, char *);
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78void usage (void);
79int xdr_dir (XDR *, char *);
80
81int
82main(int argc, char *argv[])
83{
ce0e08e2 84 int all, errs, ch, mntsize, error;
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85 char **typelist = NULL, *mntonname, *mntfromname;
86 char *type, *mntfromnamerev, *mntonnamerev;
87 struct statfs *mntbuf;
ce0e08e2 88 struct addrinfo hints;
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89
90 /* Start disks transferring immediately. */
91 sync();
92
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 */
120 }
121 argc -= optind;
122 argv += optind;
123
124 if ((argc == 0 && !all) || (argc != 0 && all))
125 usage();
126
127 /* -h implies "-t nfs" if no -t flag. */
128 if ((nfshost != NULL) && (typelist == NULL))
129 typelist = makevfslist("nfs");
130
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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));
136 }
137
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138 switch (all) {
139 case 2:
140 if ((mntsize = mntinfo(&mntbuf)) <= 0)
141 break;
142 /*
143 * We unmount the nfs-mounts in the reverse order
144 * that they were mounted.
145 */
146 for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
147 if (checkvfsname(mntbuf[mntsize].f_fstypename,
148 typelist))
149 continue;
150 /*
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.
154 */
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);
160
161 mntfromnamerev = getmntname(mntonnamerev,
162 NULL, MNTFROM, &type, NAME);
163
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);
169
ce0e08e2 170 if (checkname(mntbuf[mntsize].f_mntonname,
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171 typelist) != 0)
172 errs = 1;
173 }
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)
ce0e08e2 183 if (checkname(*argv, typelist) != 0)
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184 errs = 1;
185 break;
186 }
7cee7052 187 getmntname(NULL, NULL, NOTHING, NULL, FREE);
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188 exit(errs);
189}
190
191int
192umountall(char **typelist)
193{
194 struct vfsconf vfc;
195 struct fstab *fs;
196 int rval;
197 char *cp;
198 static int firstcall = 1;
199
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;
210 /*
211 * !!!
212 * Historic practice: ignore unknown FSTAB_* fields.
213 */
214 if (strcmp(fs->fs_type, FSTAB_RW) &&
215 strcmp(fs->fs_type, FSTAB_RO) &&
216 strcmp(fs->fs_type, FSTAB_RQ))
217 continue;
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218 /* Ignore unknown file system types. */
219 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
984263bc 220 continue;
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221 if (checkvfsname(fs->fs_vfstype, typelist))
222 continue;
223
224 /*
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.
228 */
229 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
230 err(1, "malloc failed");
7cee7052 231 strcpy(cp, fs->fs_file);
984263bc 232 rval = umountall(typelist);
ce0e08e2 233 rval = checkname(cp, typelist) || rval;
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234 free(cp);
235 return (rval);
236 } while ((fs = getfsent()) != NULL);
237 return (0);
238}
239
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240/*
241 * Do magic checks on mountpoint and device or hand over
242 * it to unmount(2) if everything fails.
243 */
984263bc 244int
ce0e08e2 245checkname(char *name, char **typelist)
984263bc 246{
984263bc 247 size_t len;
ce0e08e2 248 int speclen;
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249 char *mntonname, *mntfromname;
250 char *mntfromnamerev;
984263bc 251 char *resolved, realname[MAXPATHLEN];
ce0e08e2 252 char *type, *hostp, *delimp, *origname;
b0d1987f 253 char none[] = "none";
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254
255 len = 0;
ce0e08e2 256 mntfromname = mntonname = delimp = hostp = NULL;
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257
258 /*
259 * 1. Check if the name exists in the mounttable.
260 */
7cee7052 261 checkmntlist(name, &mntfromname, &mntonname, &type);
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262 /*
263 * 2. Remove trailing slashes if there are any. After that
264 * we look up the name in the mounttable again.
265 */
266 if (mntfromname == NULL && mntonname == NULL) {
267 speclen = strlen(name);
268 for (speclen = strlen(name);
269 speclen > 1 && name[speclen - 1] == '/';
270 speclen--)
271 name[speclen - 1] = '\0';
7cee7052 272 checkmntlist(name, &mntfromname, &mntonname, &type);
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273 resolved = name;
274 /* Save off original name in origname */
275 if ((origname = strdup(name)) == NULL)
276 err(1, "strdup");
277 /*
278 * 3. Check if the deprecated nfs-syntax with an '@'
279 * has been used and translate it to the ':' syntax.
280 * Look up the name in the mounttable again.
281 */
282 if (mntfromname == NULL && mntonname == NULL) {
283 if ((delimp = strrchr(name, '@')) != NULL) {
284 hostp = delimp + 1;
285 if (*hostp != '\0') {
286 /*
287 * Make both '@' and ':'
288 * notations equal
289 */
290 char *host = strdup(hostp);
291 len = strlen(hostp);
292 if (host == NULL)
293 err(1, "strdup");
294 memmove(name + len + 1, name,
295 (size_t)(delimp - name));
296 name[len] = ':';
297 memmove(name, host, len);
298 free(host);
299 }
300 for (speclen = strlen(name);
301 speclen > 1 && name[speclen - 1] == '/';
302 speclen--)
303 name[speclen - 1] = '\0';
304 name[len + speclen + 1] = '\0';
7cee7052 305 checkmntlist(name, &mntfromname,
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306 &mntonname, &type);
307 resolved = name;
308 }
309 /*
310 * 4. Check if a relative mountpoint has been
311 * specified. This should happen as last check,
312 * the order is important. To prevent possible
313 * nfs-hangs, we just call realpath(3) on the
314 * basedir of mountpoint and add the dirname again.
315 * Check the name in mounttable one last time.
316 */
317 if (mntfromname == NULL && mntonname == NULL) {
7cee7052 318 strcpy(name, origname);
984263bc 319 if ((getrealname(name, realname)) != NULL) {
7cee7052 320 checkmntlist(realname,
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321 &mntfromname, &mntonname, &type);
322 resolved = realname;
323 }
324 /*
ce0e08e2
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325 * 5. All tests failed, just hand over the
326 * mountpoint to the kernel, maybe the statfs
327 * structure has been truncated or is not
328 * useful anymore because of a chroot(2).
329 * Please note that nfs will not be able to
330 * notify the nfs-server about unmounting.
331 * These things can change in future when the
332 * fstat structure get's more reliable,
333 * but at the moment we cannot thrust it.
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334 */
335 if (mntfromname == NULL && mntonname == NULL) {
7cee7052 336 strcpy(name, origname);
ce0e08e2 337 if (umountfs(NULL, origname,
b0d1987f 338 none) == 0) {;
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PA
339 warnx("%s not found in "
340 "mount table, "
341 "unmounted it anyway",
342 origname);
343 free(origname);
344 return (0);
345 } else
346 free(origname);
347 return (1);
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348 }
349 }
350 }
351 free(origname);
352 } else
353 resolved = name;
354
355 if (checkvfsname(type, typelist))
356 return (1);
357
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358 /*
359 * Check if the reverse entrys of the mounttable are really the
360 * same as the normal ones.
361 */
362 if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname,
363 NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL)
364 err(1, "strdup");
365 /*
366 * Mark the uppermost mount as unmounted.
367 */
7cee7052 368 getmntname(mntfromname, mntonname, NOTHING, &type, MARK);
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369 /*
370 * If several equal mounts are in the mounttable, check the order
371 * and warn the user if necessary.
372 */
373 if (strcmp(mntfromnamerev, mntfromname ) != 0 &&
374 strcmp(resolved, mntonname) != 0) {
375 warnx("cannot umount %s, %s\n "
376 "is mounted there, umount it first",
377 mntonname, mntfromnamerev);
378
379 /* call getmntname again to set mntcheck[i] to 0 */
7cee7052 380 getmntname(mntfromname, mntonname,
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381 NOTHING, &type, UNMARK);
382 return (1);
383 }
384 free(mntfromnamerev);
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PA
385 return (umountfs(mntfromname, mntonname, type));
386}
387
388/*
389 * NFS stuff and unmount(2) call
390 */
391int
392umountfs(char *mntfromname, char *mntonname, char *type)
393{
394 enum clnt_stat clnt_stat;
395 struct timeval try;
396 struct addrinfo *ai, hints;
397 int do_rpc;
398 CLIENT *clp;
399 char *nfsdirname, *orignfsdirname;
400 char *hostp, *delimp;
401
402 ai = NULL;
403 do_rpc = 0;
404 hostp = NULL;
405 nfsdirname = delimp = orignfsdirname = NULL;
406 memset(&hints, 0, sizeof hints);
407
408 if (strcmp(type, "nfs") == 0) {
409 if ((nfsdirname = strdup(mntfromname)) == NULL)
410 err(1, "strdup");
411 orignfsdirname = nfsdirname;
412 if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
413 *delimp = '\0';
414 hostp = nfsdirname;
415 getaddrinfo(hostp, NULL, &hints, &ai);
416 if (ai == NULL) {
417 warnx("can't get net id for host");
418 }
419 nfsdirname = delimp + 1;
420 }
421
422 /*
423 * Check if we have to start the rpc-call later.
424 * If there are still identical nfs-names mounted,
425 * we skip the rpc-call. Obviously this has to
426 * happen before unmount(2), but it should happen
427 * after the previous namecheck.
428 * A non-NULL return means that this is the last
429 * mount from mntfromname that is still mounted.
430 */
431 if (getmntname(mntfromname, NULL, NOTHING, &type, COUNT)
432 != NULL)
433 do_rpc = 1;
434 }
435
436 if (!namematch(ai))
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437 return (1);
438 if (unmount(mntonname, fflag) != 0 ) {
439 warn("unmount of %s failed", mntonname);
440 return (1);
441 }
442 if (vflag)
7cee7052 443 printf("%s: unmount from %s\n", mntfromname, mntonname);
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444 /*
445 * Report to mountd-server which nfsname
446 * has been unmounted.
447 */
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PA
448 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
449 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
450 if (clp == NULL) {
451 warnx("%s: %s", hostp,
452 clnt_spcreateerror("RPCPROG_MNT"));
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453 return (1);
454 }
ce0e08e2 455 clp->cl_auth = authsys_create_default();
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456 try.tv_sec = 20;
457 try.tv_usec = 0;
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458 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, (xdrproc_t)xdr_dir,
459 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
984263bc 460 if (clnt_stat != RPC_SUCCESS) {
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461 warnx("%s: %s", hostp,
462 clnt_sperror(clp, "RPCMNT_UMOUNT"));
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463 return (1);
464 }
465 /*
466 * Remove the unmounted entry from /var/db/mounttab.
467 */
468 if (read_mtab()) {
469 clean_mtab(hostp, nfsdirname, vflag);
470 if(!write_mtab(vflag))
471 warnx("cannot remove mounttab entry %s:%s",
472 hostp, nfsdirname);
473 free_mtab();
474 }
475 free(orignfsdirname);
476 auth_destroy(clp->cl_auth);
477 clnt_destroy(clp);
478 }
479 return (0);
480}
481
482char *
483getmntname(const char *fromname, const char *onname,
484 mntwhat what, char **type, dowhat mark)
485{
486 static struct statfs *mntbuf;
b0d1987f 487 static int mntsize = 0;
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488 static char *mntcheck = NULL;
489 static char *mntcount = NULL;
490 int i, count;
491
492 if (mntsize <= 0) {
493 if ((mntsize = mntinfo(&mntbuf)) <= 0)
494 return (NULL);
495 }
496 if (mntcheck == NULL) {
497 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL ||
498 (mntcount = calloc(mntsize + 1, sizeof(int))) == NULL)
499 err(1, "calloc");
500 }
501 /*
502 * We want to get the file systems in the reverse order
503 * that they were mounted. Mounted and unmounted filesystems
504 * are marked or unmarked in a table called 'mntcheck'.
505 * Unmount(const char *dir, int flags) does only take the
506 * mountpoint as argument, not the destination. If we don't pay
507 * attention to the order, it can happen that a overlaying
508 * filesystem get's unmounted instead of the one the user
509 * has choosen.
510 */
511 switch (mark) {
512 case NAME:
513 /* Return only the specific name */
514 for (i = mntsize - 1; i >= 0; i--) {
515 if (fromname != NULL && what == MNTON &&
516 !strcmp(mntbuf[i].f_mntfromname, fromname) &&
517 mntcheck[i] != 1) {
518 if (type)
519 *type = mntbuf[i].f_fstypename;
520 return (mntbuf[i].f_mntonname);
521 }
522 if (fromname != NULL && what == MNTFROM &&
523 !strcmp(mntbuf[i].f_mntonname, fromname) &&
524 mntcheck[i] != 1) {
525 if (type)
526 *type = mntbuf[i].f_fstypename;
527 return (mntbuf[i].f_mntfromname);
528 }
529 }
530 return (NULL);
531 case MARK:
532 /* Mark current mount with '1' and return name */
533 for (i = mntsize - 1; i >= 0; i--) {
534 if (mntcheck[i] == 0 &&
535 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
536 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
537 mntcheck[i] = 1;
538 return (mntbuf[i].f_mntonname);
539 }
540 }
541 return (NULL);
542 case UNMARK:
543 /* Unmark current mount with '0' and return name */
544 for (i = 0; i < mntsize; i++) {
545 if (mntcheck[i] == 1 &&
546 (strcmp(mntbuf[i].f_mntonname, onname) == 0) &&
547 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) {
548 mntcheck[i] = 0;
549 return (mntbuf[i].f_mntonname);
550 }
551 }
552 return (NULL);
553 case COUNT:
554 /* Count the equal mntfromnames */
555 count = 0;
556 for (i = mntsize - 1; i >= 0; i--) {
557 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)
558 count++;
559 }
560 /* Mark the already unmounted mounts and return
561 * mntfromname if count <= 1. Else return NULL.
562 */
563 for (i = mntsize - 1; i >= 0; i--) {
564 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0) {
565 if (mntcount[i] == 1)
566 count--;
567 else {
568 mntcount[i] = 1;
569 break;
570 }
571 }
572 }
573 if (count <= 1)
574 return (mntbuf[i].f_mntonname);
575 else
576 return (NULL);
577 case FREE:
578 free(mntbuf);
579 free(mntcheck);
580 free(mntcount);
581 return (NULL);
582 default:
583 return (NULL);
584 }
585}
586
587int
ce0e08e2 588sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
984263bc 589{
ce0e08e2
PA
590 void *p1, *p2;
591 int len;
984263bc 592
ce0e08e2 593 if (sa1->sa_family != sa2->sa_family)
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MD
594 return (1);
595
ce0e08e2
PA
596 switch (sa1->sa_family) {
597 case AF_INET:
598 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
599 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
600 len = 4;
601 break;
602 case AF_INET6:
603 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
604 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
605 len = 16;
606 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
607 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
984263bc 608 return (1);
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PA
609 break;
610 default:
611 return (1);
984263bc 612 }
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PA
613
614 return memcmp(p1, p2, len);
615}
616
617int
618namematch(struct addrinfo *ai)
619{
620 struct addrinfo *aip;
621
622 if (nfshost == NULL || nfshost_ai == NULL)
623 return (1);
624
625 while (ai != NULL) {
626 aip = nfshost_ai;
627 while (aip != NULL) {
628 if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
984263bc 629 return (1);
ce0e08e2 630 aip = aip->ai_next;
984263bc 631 }
ce0e08e2 632 ai = ai->ai_next;
984263bc 633 }
ce0e08e2 634
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635 return (0);
636}
637
638void
639checkmntlist(char *name, char **fromname, char **onname, char **type)
640{
641
642 *fromname = getmntname(name, NULL, MNTFROM, type, NAME);
643 if (*fromname == NULL) {
644 *onname = getmntname(name, NULL, MNTON, type, NAME);
645 if (*onname != NULL)
646 *fromname = name;
647 } else
648 *onname = name;
649}
650
b0d1987f 651int
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652mntinfo(struct statfs **mntbuf)
653{
654 static struct statfs *origbuf;
655 size_t bufsize;
656 int mntsize;
657
658 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
659 if (mntsize <= 0)
660 return (0);
661 bufsize = (mntsize + 1) * sizeof(struct statfs);
662 if ((origbuf = malloc(bufsize)) == NULL)
663 err(1, "malloc");
664 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
665 *mntbuf = origbuf;
666 return (mntsize);
667}
668
669char *
670getrealname(char *name, char *realname)
671{
672 char *dirname;
673 int havedir;
674 size_t baselen;
675 size_t dirlen;
676
677 dirname = '\0';
678 havedir = 0;
679 if (*name == '/') {
680 if (ISDOT(name + 1) || ISDOTDOT(name + 1))
681 strcpy(realname, "/");
682 else {
683 if ((dirname = strrchr(name + 1, '/')) == NULL)
684 snprintf(realname, MAXPATHLEN, "%s", name);
685 else
686 havedir = 1;
687 }
688 } else {
689 if (ISDOT(name) || ISDOTDOT(name))
7cee7052 690 realpath(name, realname);
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691 else {
692 if ((dirname = strrchr(name, '/')) == NULL) {
693 if ((realpath(name, realname)) == NULL)
694 return (NULL);
695 } else
696 havedir = 1;
697 }
698 }
699 if (havedir) {
700 *dirname++ = '\0';
701 if (ISDOT(dirname)) {
702 *dirname = '\0';
703 if ((realpath(name, realname)) == NULL)
704 return (NULL);
705 } else if (ISDOTDOT(dirname)) {
706 *--dirname = '/';
707 if ((realpath(name, realname)) == NULL)
708 return (NULL);
709 } else {
710 if ((realpath(name, realname)) == NULL)
711 return (NULL);
712 baselen = strlen(realname);
713 dirlen = strlen(dirname);
714 if (baselen + dirlen + 1 > MAXPATHLEN)
715 return (NULL);
716 if (realname[1] == '\0') {
717 memmove(realname + 1, dirname, dirlen);
718 realname[dirlen + 1] = '\0';
719 } else {
720 realname[baselen] = '/';
721 memmove(realname + baselen + 1,
722 dirname, dirlen);
723 realname[baselen + dirlen + 1] = '\0';
724 }
725 }
726 }
727 return (realname);
728}
729
730/*
731 * xdr routines for mount rpc's
732 */
733int
734xdr_dir(XDR *xdrsp, char *dirp)
735{
736
737 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
738}
739
740void
80655324 741usage(void)
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742{
743
7cee7052 744 fprintf(stderr, "%s\n%s\n",
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745 "usage: umount [-fv] special | node",
746 " umount -a | -A [-fv] [-h host] [-t type]");
747 exit(1);
748}