sbin/mount/mount.c

   1 /*-
   2  * Copyright (c) 1980, 1989, 1993, 1994
   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  * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)mount.c  8.25 (Berkeley) 5/8/95
  31  * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/mount.h>
  36 #include <sys/mountctl.h>
  37 #define DKTYPENAMES
  38 #include <sys/dtype.h>
  39 #include <sys/diskslice.h>
  40 #include <sys/stat.h>
  41 #include <sys/wait.h>
  42
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <fcntl.h>
  46 #include <fstab.h>
  47 #include <mntopts.h>
  48 #include <pwd.h>
  49 #include <signal.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <libutil.h>
  55
  56 #include "extern.h"
  57 #include "pathnames.h"
  58
  59 /* `meta' options */
  60 #define MOUNT_META_OPTION_FSTAB         "fstab"
  61 #define MOUNT_META_OPTION_CURRENT       "current"
  62
  63 int debug, fstab_style, verbose;
  64
  65 static char  *catopt(char *, const char *);
  66 static struct statfs
  67              *getmntpt(const char *);
  68 static int    hasopt(const char *, const char *);
  69 static int    ismounted(struct fstab *, struct statfs *, int);
  70 static int    isremountable(const char *);
  71 static void   mangle(char *, int *, const char **);
  72 static char  *update_options(char *, char *, int);
  73 static int    mountfs(const char *, const char *, const char *,
  74                       int, const char *, const char *);
  75 static void   remopt(char *, const char *);
  76 static void   printdefvals(const struct statfs *);
  77 static void   prmount(struct statfs *);
  78 static void   putfsent(const struct statfs *);
  79 static void   usage(void);
  80 static char  *flags2opts(int);
  81 static char  *xstrdup(const char *str);
  82 static void   checkdisklabel(const char *devpath, const char **vfstypep);
  83
  84 /*
  85  * List of VFS types that can be remounted without becoming mounted on top
  86  * of each other.
  87  * XXX Is this list correct?
  88  */
  89 static const char *remountable_fs_names[] = {
  90         "ufs", "ffs", "ext2fs", "hammer", "hammer2",
  91         NULL
  92 };
  93
  94 static void
  95 restart_mountd(void)
  96 {
  97         struct pidfh *pfh;
  98         pid_t mountdpid;
  99
 100         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
 101         if (pfh != NULL) {
 102                 /* Mountd is not running. */
 103                 pidfile_remove(pfh);
 104                 return;
 105         }
 106         if (errno != EEXIST) {
 107                 /* Cannot open pidfile for some reason. */
 108                 return;
 109         }
 110         /* We have mountd(8) PID in mountdpid varible, let's signal it. */
 111         if (kill(mountdpid, SIGUSR1) == -1)
 112                 err(1, "signal mountd");
 113 }
 114
 115 int
 116 main(int argc, char **argv)
 117 {
 118         const char *mntfromname, **vfslist, *vfstype;
 119         struct fstab *fs;
 120         struct statfs *mntbuf;
 121         int all, ch, i, init_flags, mntsize, rval, have_fstab;
 122         char *options;
 123
 124         all = init_flags = 0;
 125         options = NULL;
 126         vfslist = NULL;
 127         vfstype = "ufs";
 128         while ((ch = getopt(argc, argv, "adF:fo:prwt:uv")) != -1) {
 129                 switch (ch) {
 130                 case 'a':
 131                         all = 1;
 132                         break;
 133                 case 'd':
 134                         debug = 1;
 135                         break;
 136                 case 'F':
 137                         setfstab(optarg);
 138                         break;
 139                 case 'f':
 140                         init_flags |= MNT_FORCE;
 141                         break;
 142                 case 'o':
 143                         if (*optarg)
 144                                 options = catopt(options, optarg);
 145                         break;
 146                 case 'p':
 147                         fstab_style = 1;
 148                         verbose = 1;
 149                         break;
 150                 case 'r':
 151                         options = catopt(options, "ro");
 152                         break;
 153                 case 't':
 154                         if (vfslist != NULL)
 155                                 errx(1, "only one -t option may be specified");
 156                         vfslist = makevfslist(optarg);
 157                         vfstype = optarg;
 158                         break;
 159                 case 'u':
 160                         init_flags |= MNT_UPDATE;
 161                         break;
 162                 case 'v':
 163                         verbose = 1;
 164                         break;
 165                 case 'w':
 166                         options = catopt(options, "noro");
 167                         break;
 168                 case '?':
 169                 default:
 170                         usage();
 171                         /* NOTREACHED */
 172                 }
 173         }
 174         argc -= optind;
 175         argv += optind;
 176
 177 #define BADTYPE(type)                                                   \
 178         (strcmp(type, FSTAB_RO) &&                                      \
 179             strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
 180
 181         rval = 0;
 182         switch (argc) {
 183         case 0:
 184                 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
 185                         err(1, "getmntinfo");
 186                 if (all) {
 187                         while ((fs = getfsent()) != NULL) {
 188                                 if (BADTYPE(fs->fs_type))
 189                                         continue;
 190                                 if (checkvfsname(fs->fs_vfstype, vfslist))
 191                                         continue;
 192                                 if (hasopt(fs->fs_mntops, "noauto"))
 193                                         continue;
 194                                 if (!(init_flags & MNT_UPDATE) &&
 195                                     ismounted(fs, mntbuf, mntsize))
 196                                         continue;
 197                                 options = update_options(options,
 198                                     fs->fs_mntops, mntbuf->f_flags);
 199                                 if (mountfs(fs->fs_vfstype, fs->fs_spec,
 200                                     fs->fs_file, init_flags, options,
 201                                     fs->fs_mntops))
 202                                         rval = 1;
 203                         }
 204                 } else if (fstab_style) {
 205                         for (i = 0; i < mntsize; i++) {
 206                                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 207                                         continue;
 208                                 putfsent(&mntbuf[i]);
 209                         }
 210                 } else {
 211                         for (i = 0; i < mntsize; i++) {
 212                                 if (checkvfsname(mntbuf[i].f_fstypename,
 213                                     vfslist))
 214                                         continue;
 215                                 prmount(&mntbuf[i]);
 216                         }
 217                 }
 218                 exit(rval);
 219         case 1:
 220                 if (vfslist != NULL)
 221                         usage();
 222
 223                 rmslashes(*argv, *argv);
 224
 225                 if (init_flags & MNT_UPDATE) {
 226                         mntfromname = NULL;
 227                         have_fstab = 0;
 228                         if ((mntbuf = getmntpt(*argv)) == NULL)
 229                                 errx(1, "not currently mounted %s", *argv);
 230                         /*
 231                          * Only get the mntflags from fstab if both mntpoint
 232                          * and mntspec are identical. Also handle the special
 233                          * case where just '/' is mounted and 'spec' is not
 234                          * identical with the one from fstab ('/dev' is missing
 235                          * in the spec-string at boot-time).
 236                          */
 237                         if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
 238                                 if (strcmp(fs->fs_spec,
 239                                     mntbuf->f_mntfromname) == 0 &&
 240                                     strcmp(fs->fs_file,
 241                                     mntbuf->f_mntonname) == 0) {
 242                                         have_fstab = 1;
 243                                         mntfromname = mntbuf->f_mntfromname;
 244                                 } else if (argv[0][0] == '/' &&
 245                                     argv[0][1] == '\0') {
 246                                         fs = getfsfile("/");
 247                                         have_fstab = 1;
 248                                         mntfromname = fs->fs_spec;
 249                                 }
 250                         }
 251                         if (have_fstab) {
 252                                 options = update_options(options, fs->fs_mntops,
 253                                     mntbuf->f_flags);
 254                         } else {
 255                                 mntfromname = mntbuf->f_mntfromname;
 256                                 options = update_options(options, NULL,
 257                                     mntbuf->f_flags);
 258                         }
 259                         rval = mountfs(mntbuf->f_fstypename, mntfromname,
 260                             mntbuf->f_mntonname, init_flags, options, 0);
 261                         break;
 262                 }
 263                 if ((fs = getfsfile(*argv)) == NULL &&
 264                     (fs = getfsspec(*argv)) == NULL)
 265                         errx(1, "%s: unknown special file or file system",
 266                             *argv);
 267                 if (BADTYPE(fs->fs_type))
 268                         errx(1, "%s has unknown file system type",
 269                             *argv);
 270                 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
 271                     init_flags, options, fs->fs_mntops);
 272                 break;
 273         case 2:
 274                 /*
 275                  * If -t flag has not been specified, the path cannot be
 276                  * found.
 277                  *
 278                  * If the spec is not a file and contains a ':' then assume
 279                  * NFS.
 280                  *
 281                  * If the spec is a cdev attempt to extract the fstype from
 282                  * the label.
 283                  *
 284                  * When all else fails ufs is assumed.
 285                  */
 286                 if (vfslist == NULL) {
 287                         if (strpbrk(argv[0], ":") != NULL &&
 288                             access(argv[0], 0) == -1) {
 289                                 vfstype = "nfs";
 290                         } else {
 291                                 checkdisklabel(argv[0], &vfstype);
 292                         }
 293                 }
 294
 295                 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
 296                                init_flags, options, NULL);
 297                 break;
 298         default:
 299                 usage();
 300                 /* NOTREACHED */
 301         }
 302
 303         /*
 304          * If the mount was successfully, and done by root, tell mountd the
 305          * good news.
 306          */
 307         if (rval == 0 && getuid() == 0)
 308                 restart_mountd();
 309
 310         exit(rval);
 311 }
 312
 313 static int
 314 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
 315 {
 316         int i;
 317
 318         if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
 319                 /* the root file system can always be remounted */
 320                 return (0);
 321
 322         for (i = mntsize - 1; i >= 0; --i)
 323                 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
 324                     (!isremountable(fs->fs_vfstype) ||
 325                      strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
 326                         return (1);
 327         return (0);
 328 }
 329
 330 static int
 331 isremountable(const char *vfsname)
 332 {
 333         const char **cp;
 334
 335         for (cp = remountable_fs_names; *cp; cp++)
 336                 if (strcmp(*cp, vfsname) == 0)
 337                         return (1);
 338         return (0);
 339 }
 340
 341 static int
 342 hasopt(const char *mntopts, const char *option)
 343 {
 344         int negative, found;
 345         char *opt, *optbuf;
 346
 347         if (option[0] == 'n' && option[1] == 'o') {
 348                 negative = 1;
 349                 option += 2;
 350         } else
 351                 negative = 0;
 352         optbuf = xstrdup(mntopts);
 353         found = 0;
 354         for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
 355                 if (opt[0] == 'n' && opt[1] == 'o') {
 356                         if (!strcasecmp(opt + 2, option))
 357                                 found = negative;
 358                 } else if (!strcasecmp(opt, option))
 359                         found = !negative;
 360         }
 361         free(optbuf);
 362         return (found);
 363 }
 364
 365 static int
 366 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
 367         const char *options, const char *mntopts)
 368 {
 369         /* List of directories containing mount_xxx subcommands. */
 370         static const char *edirs[] = {
 371                 _PATH_SBIN,
 372                 _PATH_USRSBIN,
 373                 NULL
 374         };
 375         const char *argv[100], **edir;
 376         struct statfs sf;
 377         pid_t pid;
 378         int argc, i, status;
 379         char *optbuf;
 380         char *argv0;
 381         char execname[MAXPATHLEN + 1];
 382         char mntpath[MAXPATHLEN];
 383
 384 #if __GNUC__
 385         (void)&optbuf;
 386         (void)&name;
 387 #endif
 388
 389         /* resolve the mountpoint with realpath(3) */
 390         checkpath(name, mntpath);
 391         name = mntpath;
 392
 393         if (mntopts == NULL)
 394                 mntopts = "";
 395         if (options == NULL) {
 396                 if (*mntopts == '\0') {
 397                         options = "rw";
 398                 } else {
 399                         options = mntopts;
 400                         mntopts = "";
 401                 }
 402         }
 403         optbuf = catopt(xstrdup(mntopts), options);
 404
 405         if (strcmp(name, "/") == 0)
 406                 flags |= MNT_UPDATE;
 407         if (flags & MNT_FORCE)
 408                 optbuf = catopt(optbuf, "force");
 409         if (flags & MNT_RDONLY)
 410                 optbuf = catopt(optbuf, "ro");
 411         /*
 412          * XXX
 413          * The mount_mfs (newfs) command uses -o to select the
 414          * optimization mode.  We don't pass the default "-o rw"
 415          * for that reason.
 416          */
 417         if (flags & MNT_UPDATE)
 418                 optbuf = catopt(optbuf, "update");
 419
 420         asprintf(&argv0, "mount_%s", vfstype);
 421
 422         argc = 0;
 423         argv[argc++] = argv0;
 424         mangle(optbuf, &argc, argv);
 425         argv[argc++] = spec;
 426         argv[argc++] = name;
 427         argv[argc] = NULL;
 428
 429         if (debug) {
 430                 printf("exec: mount_%s", vfstype);
 431                 for (i = 1; i < argc; i++)
 432                         printf(" %s", argv[i]);
 433                 printf("\n");
 434                 return (0);
 435         }
 436
 437         switch (pid = fork()) {
 438         case -1:                                /* Error. */
 439                 warn("fork");
 440                 free(optbuf);
 441                 return (1);
 442         case 0:                                 /* Child. */
 443                 /* Go find an executable. */
 444                 for (edir = edirs; *edir; edir++) {
 445                         snprintf(execname, sizeof(execname),
 446                                  "%s/mount_%s", *edir, vfstype);
 447                         execv(execname, __DECONST(char * const *, argv));
 448                 }
 449                 if (errno == ENOENT) {
 450                         int len = 0;
 451                         char *cp;
 452                         for (edir = edirs; *edir; edir++)
 453                                 len += strlen(*edir) + 2;       /* ", " */
 454                         if ((cp = malloc(len)) == NULL)
 455                                 errx(1, "malloc failed");
 456                         cp[0] = '\0';
 457                         for (edir = edirs; *edir; edir++) {
 458                                 strcat(cp, *edir);
 459                                 if (edir[1] != NULL)
 460                                         strcat(cp, ", ");
 461                         }
 462                         warn("exec mount_%s not found in %s", vfstype, cp);
 463                 }
 464                 exit(1);
 465                 /* NOTREACHED */
 466         default:                                /* Parent. */
 467                 free(optbuf);
 468
 469                 if (waitpid(pid, &status, 0) < 0) {
 470                         warn("waitpid");
 471                         return (1);
 472                 }
 473
 474                 if (WIFEXITED(status)) {
 475                         if (WEXITSTATUS(status) != 0)
 476                                 return (WEXITSTATUS(status));
 477                 } else if (WIFSIGNALED(status)) {
 478                         warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
 479                         return (1);
 480                 }
 481
 482                 if (verbose) {
 483                         if (statfs(name, &sf) < 0) {
 484                                 warn("statfs %s", name);
 485                                 return (1);
 486                         }
 487                         if (fstab_style)
 488                                 putfsent(&sf);
 489                         else
 490                                 prmount(&sf);
 491                 }
 492                 break;
 493         }
 494
 495         return (0);
 496 }
 497
 498 static void
 499 prmount(struct statfs *sfp)
 500 {
 501         struct passwd *pw;
 502         char *buf;
 503         int error;
 504         int len;
 505
 506         error = 0;
 507         len = 256;
 508
 509         if ((buf = malloc(len)) == NULL)
 510                 errx(1, "malloc failed");
 511
 512         printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
 513             sfp->f_fstypename);
 514
 515         /* Get a string buffer with all the used flags names */
 516         error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS,
 517                          -1, NULL, 0, buf, len);
 518
 519         if (sfp->f_owner) {
 520                 printf(", mounted by ");
 521                 if ((pw = getpwuid(sfp->f_owner)) != NULL)
 522                         printf("%s", pw->pw_name);
 523                 else
 524                         printf("%d", sfp->f_owner);
 525         }
 526
 527         if (error != -1 && strlen(buf))
 528                 printf(", %s", buf);
 529
 530         if (verbose) {
 531                 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
 532                         printf(", writes: sync %ld async %ld",
 533                             sfp->f_syncwrites, sfp->f_asyncwrites);
 534                 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
 535                         printf(", reads: sync %ld async %ld",
 536                             sfp->f_syncreads, sfp->f_asyncreads);
 537         }
 538         printf(")\n");
 539 }
 540
 541 static struct statfs *
 542 getmntpt(const char *name)
 543 {
 544         struct statfs *mntbuf;
 545         int i, mntsize;
 546
 547         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 548         for (i = mntsize - 1; i >= 0; i--) {
 549                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
 550                     strcmp(mntbuf[i].f_mntonname, name) == 0)
 551                         return (&mntbuf[i]);
 552         }
 553         return (NULL);
 554 }
 555
 556 static char *
 557 catopt(char *s0, const char *s1)
 558 {
 559         size_t i;
 560         char *cp;
 561
 562         if (s1 == NULL || *s1 == '\0')
 563                 return s0;
 564
 565         if (s0 && *s0) {
 566                 i = strlen(s0) + strlen(s1) + 1 + 1;
 567                 if ((cp = malloc(i)) == NULL)
 568                         errx(1, "malloc failed");
 569                 snprintf(cp, i, "%s,%s", s0, s1);
 570         } else
 571                 cp = xstrdup(s1);
 572
 573         if (s0)
 574                 free(s0);
 575         return (cp);
 576 }
 577
 578 static void
 579 mangle(char *options, int *argcp, const char **argv)
 580 {
 581         char *p, *s;
 582         int argc;
 583
 584         argc = *argcp;
 585         for (s = options; (p = strsep(&s, ",")) != NULL;)
 586                 if (*p != '\0') {
 587                         if (*p == '-') {
 588                                 argv[argc++] = p;
 589                                 p = strchr(p, '=');
 590                                 if (p) {
 591                                         *p = '\0';
 592                                         argv[argc++] = p+1;
 593                                 }
 594                         } else if (strcmp(p, "rw") != 0) {
 595                                 argv[argc++] = "-o";
 596                                 argv[argc++] = p;
 597                         }
 598                 }
 599
 600         *argcp = argc;
 601 }
 602
 603
 604 static char *
 605 update_options(char *opts, char *fstab, int curflags)
 606 {
 607         char *o, *p;
 608         char *cur;
 609         char *expopt, *newopt, *tmpopt;
 610
 611         if (opts == NULL)
 612                 return xstrdup("");
 613
 614         /* remove meta options from list */
 615         remopt(fstab, MOUNT_META_OPTION_FSTAB);
 616         remopt(fstab, MOUNT_META_OPTION_CURRENT);
 617         cur = flags2opts(curflags);
 618
 619         /*
 620          * Expand all meta-options passed to us first.
 621          */
 622         expopt = NULL;
 623         for (p = opts; (o = strsep(&p, ",")) != NULL;) {
 624                 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
 625                         expopt = catopt(expopt, fstab);
 626                 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
 627                         expopt = catopt(expopt, cur);
 628                 else
 629                         expopt = catopt(expopt, o);
 630         }
 631         free(cur);
 632         free(opts);
 633
 634         /*
 635          * Remove previous contradictory arguments. Given option "foo" we
 636          * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
 637          * and "foo" - so we can deal with possible options like "notice".
 638          */
 639         newopt = NULL;
 640         for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
 641                 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
 642                         errx(1, "malloc failed");
 643
 644                 strcpy(tmpopt, "no");
 645                 strcat(tmpopt, o);
 646                 remopt(newopt, tmpopt);
 647                 free(tmpopt);
 648
 649                 if (strncmp("no", o, 2) == 0)
 650                         remopt(newopt, o+2);
 651
 652                 newopt = catopt(newopt, o);
 653         }
 654         free(expopt);
 655
 656         return newopt;
 657 }
 658
 659 static void
 660 remopt(char *string, const char *opt)
 661 {
 662         char *o, *p, *r;
 663
 664         if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
 665                 return;
 666
 667         r = string;
 668
 669         for (p = string; (o = strsep(&p, ",")) != NULL;) {
 670                 if (strcmp(opt, o) != 0) {
 671                         if (*r == ',' && *o != '\0')
 672                                 r++;
 673                         while ((*r++ = *o++) != '\0')
 674                             ;
 675                         *--r = ',';
 676                 }
 677         }
 678         *r = '\0';
 679 }
 680
 681 static void
 682 usage(void)
 683 {
 684
 685         fprintf(stderr, "%s\n%s\n%s\n",
 686 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t type]",
 687 "       mount [-dfpruvw] {special | node}",
 688 "       mount [-dfpruvw] [-o options] [-t type] special node");
 689         exit(1);
 690 }
 691
 692 /*
 693  * Prints the default values for dump frequency and pass number of fsck.
 694  * This happens when mount(8) is called with -p and there is no fstab file
 695  * or there is but the values aren't specified.
 696  */
 697 static void
 698 printdefvals(const struct statfs *ent)
 699 {
 700         if (strcmp(ent->f_fstypename, "ufs") == 0) {
 701                 if (strcmp(ent->f_mntonname, "/") == 0)
 702                         printf("\t1 1\n");
 703                 else
 704                         printf("\t2 2\n");
 705         } else {
 706                 printf("\t0 0\n");
 707         }
 708 }
 709
 710 static void
 711 putfsent(const struct statfs *ent)
 712 {
 713         struct stat sb;
 714         struct fstab *fst;
 715         char *opts;
 716
 717         opts = flags2opts(ent->f_flags);
 718         printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
 719             ent->f_fstypename, opts);
 720         free(opts);
 721
 722         /*
 723          * If fstab file is missing don't call getfsspec() or getfsfile()
 724          * at all, because the same warning will be printed twice for every
 725          * mounted filesystem.
 726          */
 727         if (stat(_PATH_FSTAB, &sb) != -1) {
 728                 if ((fst = getfsspec(ent->f_mntfromname)))
 729                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 730                 else if ((fst = getfsfile(ent->f_mntonname)))
 731                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 732                 else
 733                         printdefvals(ent);
 734         } else {
 735                 printdefvals(ent);
 736         }
 737 }
 738
 739
 740 static char *
 741 flags2opts(int flags)
 742 {
 743         char *res;
 744
 745         res = NULL;
 746
 747         res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
 748
 749         if (flags & MNT_SYNCHRONOUS)    res = catopt(res, "sync");
 750         if (flags & MNT_NOEXEC)         res = catopt(res, "noexec");
 751         if (flags & MNT_NOSUID)         res = catopt(res, "nosuid");
 752         if (flags & MNT_NODEV)          res = catopt(res, "nodev");
 753         if (flags & MNT_ASYNC)          res = catopt(res, "async");
 754         if (flags & MNT_NOATIME)        res = catopt(res, "noatime");
 755         if (flags & MNT_NOCLUSTERR)     res = catopt(res, "noclusterr");
 756         if (flags & MNT_NOCLUSTERW)     res = catopt(res, "noclusterw");
 757         if (flags & MNT_NOSYMFOLLOW)    res = catopt(res, "nosymfollow");
 758         if (flags & MNT_SUIDDIR)        res = catopt(res, "suiddir");
 759         if (flags & MNT_IGNORE)         res = catopt(res, "ignore");
 760
 761         return res;
 762 }
 763
 764 static char*
 765 xstrdup(const char *str)
 766 {
 767         char* ret = strdup(str);
 768         if(ret == NULL) {
 769                 errx(1, "strdup failed (could not allocate memory)");
 770         }
 771         return ret;
 772 }
 773
 774 /*
 775  * Hack 'cd9660' for the default fstype on cd media if no disklabel
 776  * found.
 777  */
 778 static int
 779 iscdmedia(const char *path, int fd __unused)
 780 {
 781         int n;
 782
 783         if (strrchr(path, '/'))
 784                 path = strrchr(path, '/') + 1;
 785         if (sscanf(path, "acd%d", &n) == 1)
 786                 return 1;
 787         if (sscanf(path, "cd%d", &n) == 1)
 788                 return 1;
 789         return 0;
 790 }
 791
 792 /*
 793  * If the device path is a cdev attempt to access the disklabel to determine
 794  * the filesystem type.  Adjust *vfstypep if we can figure it out
 795  * definitively.
 796  *
 797  * Ignore any portion of the device path after an '@' or ':'.
 798  */
 799 static void
 800 checkdisklabel(const char *devpath, const char **vfstypep)
 801 {
 802         struct stat st;
 803         struct partinfo info;
 804         char *path = strdup(devpath);
 805         int fd;
 806
 807         if (strchr(path, '@'))
 808                 *strchr(path, '@') = 0;
 809         if (strchr(path, ':'))
 810                 *strchr(path, ':') = 0;
 811
 812         if (stat(path, &st) < 0)
 813                 goto done;
 814         if (!S_ISCHR(st.st_mode))
 815                 goto done;
 816         fd = open(path, O_RDONLY);
 817         if (fd < 0)
 818                 goto done;
 819         if (ioctl(fd, DIOCGPART, &info) == 0) {
 820                 if (info.fstype >= 0 && info.fstype < (int)FSMAXTYPES) {
 821                         if (fstype_to_vfsname[info.fstype]) {
 822                                 *vfstypep = fstype_to_vfsname[info.fstype];
 823                         } else if (iscdmedia(path, fd)) {
 824                                 *vfstypep = "cd9660";
 825                         } else {
 826                                 fprintf(stderr,
 827                                         "mount: warning: fstype in disklabel "
 828                                         "not set to anything I understand\n");
 829                                 fprintf(stderr,
 830                                         "attempting to mount with -t ufs\n");
 831                         }
 832                 }
 833         }
 834         close(fd);
 835 done:
 836         free(path);
 837 }