sbin/umount/umount.c

   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.
  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
  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 $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/mount.h>
  41 #include <sys/socket.h>
  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
  59 typedef enum { MNTON, MNTFROM, NOTHING } mntwhat;
  60 typedef enum { MARK, UNMARK, NAME, COUNT, FREE } dowhat;
  61
  62 struct  addrinfo *nfshost_ai = NULL;
  63 int     fflag, vflag;
  64 char   *nfshost;
  65
  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 *);
  80
  81 int
  82 main(int argc, char *argv[])
  83 {
  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;
  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
 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
 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
 170                         if (checkname(mntbuf[mntsize].f_mntonname,
 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)
 183                         if (checkname(*argv, typelist) != 0)
 184                                 errs = 1;
 185                 break;
 186         }
 187         getmntname(NULL, NULL, NOTHING, NULL, FREE);
 188         exit(errs);
 189 }
 190
 191 int
 192 umountall(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;
 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;
 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");
 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);
 238 }
 239
 240 /*
 241  * Do magic checks on mountpoint and device or hand over
 242  * it to unmount(2) if everything fails.
 243  */
 244 int
 245 checkname(char *name, char **typelist)
 246 {
 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";
 254
 255         len = 0;
 256         mntfromname = mntonname = delimp = hostp = NULL;
 257
 258         /*
 259          * 1. Check if the name exists in the mounttable.
 260          */
 261         checkmntlist(name, &mntfromname, &mntonname, &type);
 262         if (mntfromname == NULL && mntonname == NULL) {
 263                 checkmntlist(getdevpath(name, 0), &mntfromname,
 264                              &mntonname, &type);
 265         }
 266
 267         /*
 268          * 2. Remove trailing slashes if there are any. After that
 269          * we look up the name in the mounttable again.
 270          */
 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");
 282                 /*
 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.
 286                  */
 287                 if (mntfromname == NULL && mntonname == NULL) {
 288                         if ((delimp = strrchr(name, '@')) != NULL) {
 289                                 hostp = delimp + 1;
 290                                 if (*hostp != '\0') {
 291                                         /*
 292                                          * Make both '@' and ':'
 293                                          * notations equal
 294                                          */
 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);
 304                                 }
 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;
 313                         }
 314                         /*
 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.
 321                          */
 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;
 328                                 }
 329                                 /*
 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.
 339                                  */
 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);
 353                                 }
 354                         }
 355                 }
 356                 free(origname);
 357         } else
 358                 resolved = name;
 359
 360         if (checkvfsname(type, typelist))
 361                 return (1);
 362
 363         /*
 364          * Check if the reverse entrys of the mounttable are really the
 365          * same as the normal ones.
 366          */
 367         if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname,
 368             NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL)
 369                 err(1, "strdup");
 370         /*
 371          * Mark the uppermost mount as unmounted.
 372          */
 373         getmntname(mntfromname, mntonname, NOTHING, &type, MARK);
 374         /*
 375          * If several equal mounts are in the mounttable, check the order
 376          * and warn the user if necessary.
 377          */
 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);
 383
 384                 /* call getmntname again to set mntcheck[i] to 0 */
 385                 getmntname(mntfromname, mntonname,
 386                     NOTHING, &type, UNMARK);
 387                 return (1);
 388         }
 389         free(mntfromnamerev);
 390         return (umountfs(mntfromname, mntonname, type));
 391 }
 392
 393 /*
 394  * NFS stuff and unmount(2) call
 395  */
 396 int
 397 umountfs(char *mntfromname, char *mntonname, char *type)
 398 {
 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;
 406
 407         ai = NULL;
 408         do_rpc = 0;
 409         hostp = NULL;
 410         nfsdirname = delimp = orignfsdirname = NULL;
 411         memset(&hints, 0, sizeof hints);
 412
 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");
 423                         }
 424                         nfsdirname = delimp + 1;
 425                 }
 426
 427                 /*
 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.
 435                  */
 436                 if (getmntname(mntfromname, NULL, NOTHING, &type, COUNT)
 437                      != NULL)
 438                         do_rpc = 1;
 439         }
 440
 441         if (!namematch(ai))
 442                 return (1);
 443         if (unmount(mntonname, fflag) != 0 ) {
 444                 warn("unmount of %s failed", mntonname);
 445                 return (1);
 446         }
 447         if (vflag)
 448                 printf("%s: unmount from %s\n", mntfromname, mntonname);
 449         /*
 450          * Report to mountd-server which nfsname
 451          * has been unmounted.
 452          */
 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);
 459                 }
 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);
 469                 }
 470                 /*
 471                  * Remove the unmounted entry from /var/db/mounttab.
 472                  */
 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();
 479                 }
 480                 free(orignfsdirname);
 481                 auth_destroy(clp->cl_auth);
 482                 clnt_destroy(clp);
 483         }
 484         return (0);
 485 }
 486
 487 char *
 488 getmntname(const char *fromname, const char *onname,
 489     mntwhat what, char **type, dowhat mark)
 490 {
 491         static struct statfs *mntbuf;
 492         static int mntsize = 0;
 493         static char *mntcheck = NULL;
 494         static char *mntcount = NULL;
 495         int i, count;
 496
 497         if (mntsize <= 0) {
 498                 if ((mntsize = mntinfo(&mntbuf)) <= 0)
 499                         return (NULL);
 500         }
 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");
 505         }
 506         /*
 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.
 515          */
 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);
 526                         }
 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);
 533                         }
 534                 }
 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);
 544                         }
 545                 }
 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);
 555                         }
 556                 }
 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++;
 564                 }
 565                 /* Mark the already unmounted mounts and return
 566                  * mntfromname if count <= 1. Else return NULL.
 567                  */
 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;
 575                                 }
 576                         }
 577                 }
 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);
 589         }
 590 }
 591
 592 int
 593 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
 594 {
 595         void *p1, *p2;
 596         int len;
 597
 598         if (sa1->sa_family != sa2->sa_family)
 599                 return (1);
 600
 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);
 617         }
 618
 619         return memcmp(p1, p2, len);
 620 }
 621
 622 int
 623 namematch(struct addrinfo *ai)
 624 {
 625         struct addrinfo *aip;
 626
 627         if (nfshost == NULL || nfshost_ai == NULL)
 628                 return (1);
 629
 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;
 636                 }
 637                 ai = ai->ai_next;
 638         }
 639
 640         return (0);
 641 }
 642
 643 void
 644 checkmntlist(char *name, char **fromname, char **onname, char **type)
 645 {
 646
 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;
 654 }
 655
 656 int
 657 mntinfo(struct statfs **mntbuf)
 658 {
 659         static struct statfs *origbuf;
 660         size_t bufsize;
 661         int mntsize;
 662
 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);
 672 }
 673
 674 char *
 675 getrealname(char *name, char *realname)
 676 {
 677         char *dirname;
 678         int havedir;
 679         size_t baselen;
 680         size_t dirlen;
 681
 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;
 692                 }
 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;
 702                 }
 703         }
 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';
 729                         }
 730                 }
 731         }
 732         return (realname);
 733 }
 734
 735 /*
 736  * xdr routines for mount rpc's
 737  */
 738 int
 739 xdr_dir(XDR *xdrsp, char *dirp)
 740 {
 741
 742         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 743 }
 744
 745 void
 746 usage(void)
 747 {
 748
 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);
 753 }