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