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. 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, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)mount.c  8.25 (Berkeley) 5/8/95
  35  * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
  36  * $DragonFly: src/sbin/mount/mount.c,v 1.10 2005/04/03 17:13:08 joerg Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/mount.h>
  41 #include <sys/stat.h>
  42 #include <sys/wait.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fstab.h>
  47 #include <pwd.h>
  48 #include <signal.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 #include "extern.h"
  55 #include "mntopts.h"
  56 #include "pathnames.h"
  57
  58 /* `meta' options */
  59 #define MOUNT_META_OPTION_FSTAB         "fstab"
  60 #define MOUNT_META_OPTION_CURRENT       "current"
  61
  62 int debug, fstab_style, verbose;
  63
  64 static char  *catopt(char *, const char *);
  65 static struct statfs
  66              *getmntpt(const char *);
  67 static int    hasopt(const char *, const char *);
  68 static int    ismounted(struct fstab *, struct statfs *, int);
  69 static int    isremountable(const char *);
  70 static void   mangle(char *, int *, const char **);
  71 static char  *update_options(char *, char *, int);
  72 static int    mountfs(const char *, const char *, const char *,
  73                       int, const char *, const char *);
  74 static void   remopt(char *, const char *);
  75 static void   prmount(struct statfs *);
  76 static void   putfsent(const struct statfs *);
  77 static void   usage(void);
  78 static char  *flags2opts(int);
  79 static char  *xstrdup(const char *str);
  80
  81 /* Map from mount options to printable formats. */
  82 static struct opt {
  83         int o_opt;
  84         const char *o_name;
  85 } optnames[] = {
  86         { MNT_ASYNC,            "asynchronous" },
  87         { MNT_EXPORTED,         "NFS exported" },
  88         { MNT_LOCAL,            "local" },
  89         { MNT_NOATIME,          "noatime" },
  90         { MNT_NODEV,            "nodev" },
  91         { MNT_NOEXEC,           "noexec" },
  92         { MNT_NOSUID,           "nosuid" },
  93         { MNT_NOSYMFOLLOW,      "nosymfollow" },
  94         { MNT_QUOTA,            "with quotas" },
  95         { MNT_RDONLY,           "read-only" },
  96         { MNT_SYNCHRONOUS,      "synchronous" },
  97         { MNT_UNION,            "union" },
  98         { MNT_NOCLUSTERR,       "noclusterr" },
  99         { MNT_NOCLUSTERW,       "noclusterw" },
 100         { MNT_SUIDDIR,          "suiddir" },
 101         { MNT_SOFTDEP,          "soft-updates" },
 102         { 0, NULL }
 103 };
 104
 105 /*
 106  * List of VFS types that can be remounted without becoming mounted on top
 107  * of each other.
 108  * XXX Is this list correct?
 109  */
 110 static const char *
 111 remountable_fs_names[] = {
 112         "ufs", "ffs", "ext2fs",
 113         0
 114 };
 115
 116 int
 117 main(int argc, char **argv)
 118 {
 119         const char *mntfromname, **vfslist, *vfstype;
 120         struct fstab *fs;
 121         struct statfs *mntbuf;
 122         FILE *mountdfp;
 123         pid_t pid;
 124         int all, ch, i, init_flags, mntsize, rval, have_fstab;
 125         char *options;
 126
 127         all = init_flags = 0;
 128         options = NULL;
 129         vfslist = NULL;
 130         vfstype = "ufs";
 131         while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
 132                 switch (ch) {
 133                 case 'a':
 134                         all = 1;
 135                         break;
 136                 case 'd':
 137                         debug = 1;
 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         argc -= optind;
 174         argv += optind;
 175
 176 #define BADTYPE(type)                                                   \
 177         (strcmp(type, FSTAB_RO) &&                                      \
 178             strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
 179
 180         rval = 0;
 181         switch (argc) {
 182         case 0:
 183                 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
 184                         err(1, "getmntinfo");
 185                 if (all) {
 186                         while ((fs = getfsent()) != NULL) {
 187                                 if (BADTYPE(fs->fs_type))
 188                                         continue;
 189                                 if (checkvfsname(fs->fs_vfstype, vfslist))
 190                                         continue;
 191                                 if (hasopt(fs->fs_mntops, "noauto"))
 192                                         continue;
 193                                 if (!(init_flags & MNT_UPDATE) &&
 194                                     ismounted(fs, mntbuf, mntsize))
 195                                         continue;
 196                                 options = update_options(options,
 197                                     fs->fs_mntops, mntbuf->f_flags);
 198                                 if (mountfs(fs->fs_vfstype, fs->fs_spec,
 199                                     fs->fs_file, init_flags, options,
 200                                     fs->fs_mntops))
 201                                         rval = 1;
 202                         }
 203                 } else if (fstab_style) {
 204                         for (i = 0; i < mntsize; i++) {
 205                                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 206                                         continue;
 207                                 putfsent(&mntbuf[i]);
 208                         }
 209                 } else {
 210                         for (i = 0; i < mntsize; i++) {
 211                                 if (checkvfsname(mntbuf[i].f_fstypename,
 212                                     vfslist))
 213                                         continue;
 214                                 prmount(&mntbuf[i]);
 215                         }
 216                 }
 217                 exit(rval);
 218         case 1:
 219                 if (vfslist != NULL)
 220                         usage();
 221
 222                 rmslashes(*argv, *argv);
 223
 224                 if (init_flags & MNT_UPDATE) {
 225                         mntfromname = NULL;
 226                         have_fstab = 0;
 227                         if ((mntbuf = getmntpt(*argv)) == NULL)
 228                                 errx(1, "not currently mounted %s", *argv);
 229                         /*
 230                          * Only get the mntflags from fstab if both mntpoint
 231                          * and mntspec are identical. Also handle the special
 232                          * case where just '/' is mounted and 'spec' is not
 233                          * identical with the one from fstab ('/dev' is missing
 234                          * in the spec-string at boot-time).
 235                          */
 236                         if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
 237                                 if (strcmp(fs->fs_spec,
 238                                     mntbuf->f_mntfromname) == 0 &&
 239                                     strcmp(fs->fs_file,
 240                                     mntbuf->f_mntonname) == 0) {
 241                                         have_fstab = 1;
 242                                         mntfromname = mntbuf->f_mntfromname;
 243                                 } else if (argv[0][0] == '/' &&
 244                                     argv[0][1] == '\0') {
 245                                         fs = getfsfile("/");
 246                                         have_fstab = 1;
 247                                         mntfromname = fs->fs_spec;
 248                                 }
 249                         }
 250                         if (have_fstab) {
 251                                 options = update_options(options, fs->fs_mntops,
 252                                     mntbuf->f_flags);
 253                         } else {
 254                                 mntfromname = mntbuf->f_mntfromname;
 255                                 options = update_options(options, NULL,
 256                                     mntbuf->f_flags);
 257                         }
 258                         rval = mountfs(mntbuf->f_fstypename, mntfromname,
 259                             mntbuf->f_mntonname, init_flags, options, 0);
 260                         break;
 261                 }
 262                 if ((fs = getfsfile(*argv)) == NULL &&
 263                     (fs = getfsspec(*argv)) == NULL)
 264                         errx(1, "%s: unknown special file or file system",
 265                             *argv);
 266                 if (BADTYPE(fs->fs_type))
 267                         errx(1, "%s has unknown file system type",
 268                             *argv);
 269                 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
 270                     init_flags, options, fs->fs_mntops);
 271                 break;
 272         case 2:
 273                 /*
 274                  * If -t flag has not been specified, the path cannot be
 275                  * found, spec contains either a ':' or a '@', and the
 276                  * spec is not a file with those characters, then assume
 277                  * that an NFS filesystem is being specified ala Sun.
 278                  */
 279                 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
 280                     access(argv[0], 0) == -1)
 281                         vfstype = "nfs";
 282                 rval = mountfs(vfstype,
 283                     argv[0], argv[1], init_flags, options, NULL);
 284                 break;
 285         default:
 286                 usage();
 287                 /* NOTREACHED */
 288         }
 289
 290         /*
 291          * If the mount was successfully, and done by root, tell mountd the
 292          * good news.  Pid checks are probably unnecessary, but don't hurt.
 293          */
 294         if (rval == 0 && getuid() == 0 &&
 295             (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
 296                 if (fscanf(mountdfp, "%d", &pid) == 1 &&
 297                      pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
 298                         err(1, "signal mountd");
 299                 fclose(mountdfp);
 300         }
 301
 302         exit(rval);
 303 }
 304
 305 static int
 306 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
 307 {
 308         int i;
 309
 310         if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
 311                 /* the root file system can always be remounted */
 312                 return (0);
 313
 314         for (i = mntsize - 1; i >= 0; --i)
 315                 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
 316                     (!isremountable(fs->fs_vfstype) ||
 317                      strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
 318                         return (1);
 319         return (0);
 320 }
 321
 322 static int
 323 isremountable(const char *vfsname)
 324 {
 325         const char **cp;
 326
 327         for (cp = remountable_fs_names; *cp; cp++)
 328                 if (strcmp(*cp, vfsname) == 0)
 329                         return (1);
 330         return (0);
 331 }
 332
 333 static int
 334 hasopt(const char *mntopts, const char *option)
 335 {
 336         int negative, found;
 337         char *opt, *optbuf;
 338
 339         if (option[0] == 'n' && option[1] == 'o') {
 340                 negative = 1;
 341                 option += 2;
 342         } else
 343                 negative = 0;
 344         optbuf = xstrdup(mntopts);
 345         found = 0;
 346         for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
 347                 if (opt[0] == 'n' && opt[1] == 'o') {
 348                         if (!strcasecmp(opt + 2, option))
 349                                 found = negative;
 350                 } else if (!strcasecmp(opt, option))
 351                         found = !negative;
 352         }
 353         free(optbuf);
 354         return (found);
 355 }
 356
 357 static int
 358 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
 359         const char *options, const char *mntopts)
 360 {
 361         /* List of directories containing mount_xxx subcommands. */
 362         static const char *edirs[] = {
 363                 _PATH_SBIN,
 364                 _PATH_USRSBIN,
 365                 NULL
 366         };
 367         const char *argv[100], **edir;
 368         struct statfs sf;
 369         pid_t pid;
 370         int argc, i, status;
 371         char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
 372
 373 #if __GNUC__
 374         (void)&optbuf;
 375         (void)&name;
 376 #endif
 377
 378         /* resolve the mountpoint with realpath(3) */
 379         checkpath(name, mntpath);
 380         name = mntpath;
 381
 382         if (mntopts == NULL)
 383                 mntopts = "";
 384         if (options == NULL) {
 385                 if (*mntopts == '\0') {
 386                         options = "rw";
 387                 } else {
 388                         options = mntopts;
 389                         mntopts = "";
 390                 }
 391         }
 392         optbuf = catopt(xstrdup(mntopts), options);
 393
 394         if (strcmp(name, "/") == 0)
 395                 flags |= MNT_UPDATE;
 396         if (flags & MNT_FORCE)
 397                 optbuf = catopt(optbuf, "force");
 398         if (flags & MNT_RDONLY)
 399                 optbuf = catopt(optbuf, "ro");
 400         /*
 401          * XXX
 402          * The mount_mfs (newfs) command uses -o to select the
 403          * optimization mode.  We don't pass the default "-o rw"
 404          * for that reason.
 405          */
 406         if (flags & MNT_UPDATE)
 407                 optbuf = catopt(optbuf, "update");
 408
 409         argc = 0;
 410         argv[argc++] = vfstype;
 411         mangle(optbuf, &argc, argv);
 412         argv[argc++] = spec;
 413         argv[argc++] = name;
 414         argv[argc] = NULL;
 415
 416         if (debug) {
 417                 printf("exec: mount_%s", vfstype);
 418                 for (i = 1; i < argc; i++)
 419                         printf(" %s", argv[i]);
 420                 printf("\n");
 421                 return (0);
 422         }
 423
 424         switch (pid = fork()) {
 425         case -1:                                /* Error. */
 426                 warn("fork");
 427                 free(optbuf);
 428                 return (1);
 429         case 0:                                 /* Child. */
 430                 if (strcmp(vfstype, "ufs") == 0)
 431                         exit(mount_ufs(argc, argv));
 432
 433                 /* Go find an executable. */
 434                 for (edir = edirs; *edir; edir++) {
 435                         snprintf(execname,
 436                             sizeof(execname), "%s/mount_%s", *edir, vfstype);
 437                         execv(execname, __DECONST(char * const *, argv));
 438                 }
 439                 if (errno == ENOENT) {
 440                         int len = 0;
 441                         char *cp;
 442                         for (edir = edirs; *edir; edir++)
 443                                 len += strlen(*edir) + 2;       /* ", " */
 444                         if ((cp = malloc(len)) == NULL)
 445                                 errx(1, "malloc failed");
 446                         cp[0] = '\0';
 447                         for (edir = edirs; *edir; edir++) {
 448                                 strcat(cp, *edir);
 449                                 if (edir[1] != NULL)
 450                                         strcat(cp, ", ");
 451                         }
 452                         warn("exec mount_%s not found in %s", vfstype, cp);
 453                 }
 454                 exit(1);
 455                 /* NOTREACHED */
 456         default:                                /* Parent. */
 457                 free(optbuf);
 458
 459                 if (waitpid(pid, &status, 0) < 0) {
 460                         warn("waitpid");
 461                         return (1);
 462                 }
 463
 464                 if (WIFEXITED(status)) {
 465                         if (WEXITSTATUS(status) != 0)
 466                                 return (WEXITSTATUS(status));
 467                 } else if (WIFSIGNALED(status)) {
 468                         warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
 469                         return (1);
 470                 }
 471
 472                 if (verbose) {
 473                         if (statfs(name, &sf) < 0) {
 474                                 warn("statfs %s", name);
 475                                 return (1);
 476                         }
 477                         if (fstab_style)
 478                                 putfsent(&sf);
 479                         else
 480                                 prmount(&sf);
 481                 }
 482                 break;
 483         }
 484
 485         return (0);
 486 }
 487
 488 static void
 489 prmount(struct statfs *sfp)
 490 {
 491         int flags;
 492         struct opt *o;
 493         struct passwd *pw;
 494
 495         printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
 496             sfp->f_fstypename);
 497
 498         flags = sfp->f_flags & MNT_VISFLAGMASK;
 499         for (o = optnames; flags && o->o_opt; o++)
 500                 if (flags & o->o_opt) {
 501                         printf(", %s", o->o_name);
 502                         flags &= ~o->o_opt;
 503                 }
 504         if (sfp->f_owner) {
 505                 printf(", mounted by ");
 506                 if ((pw = getpwuid(sfp->f_owner)) != NULL)
 507                         printf("%s", pw->pw_name);
 508                 else
 509                         printf("%d", sfp->f_owner);
 510         }
 511         if (verbose) {
 512                 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
 513                         printf(", writes: sync %ld async %ld",
 514                             sfp->f_syncwrites, sfp->f_asyncwrites);
 515                 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
 516                         printf(", reads: sync %ld async %ld",
 517                             sfp->f_syncreads, sfp->f_asyncreads);
 518         }
 519         printf(")\n");
 520 }
 521
 522 static struct statfs *
 523 getmntpt(const char *name)
 524 {
 525         struct statfs *mntbuf;
 526         int i, mntsize;
 527
 528         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 529         for (i = mntsize - 1; i >= 0; i--) {
 530                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
 531                     strcmp(mntbuf[i].f_mntonname, name) == 0)
 532                         return (&mntbuf[i]);
 533         }
 534         return (NULL);
 535 }
 536
 537 static char *
 538 catopt(char *s0, const char *s1)
 539 {
 540         size_t i;
 541         char *cp;
 542
 543         if (s1 == NULL || *s1 == '\0')
 544                 return s0;
 545
 546         if (s0 && *s0) {
 547                 i = strlen(s0) + strlen(s1) + 1 + 1;
 548                 if ((cp = malloc(i)) == NULL)
 549                         errx(1, "malloc failed");
 550                 snprintf(cp, i, "%s,%s", s0, s1);
 551         } else
 552                 cp = xstrdup(s1);
 553
 554         if (s0)
 555                 free(s0);
 556         return (cp);
 557 }
 558
 559 static void
 560 mangle(char *options, int *argcp, const char **argv)
 561 {
 562         char *p, *s;
 563         int argc;
 564
 565         argc = *argcp;
 566         for (s = options; (p = strsep(&s, ",")) != NULL;)
 567                 if (*p != '\0') {
 568                         if (*p == '-') {
 569                                 argv[argc++] = p;
 570                                 p = strchr(p, '=');
 571                                 if (p) {
 572                                         *p = '\0';
 573                                         argv[argc++] = p+1;
 574                                 }
 575                         } else if (strcmp(p, "rw") != 0) {
 576                                 argv[argc++] = "-o";
 577                                 argv[argc++] = p;
 578                         }
 579                 }
 580
 581         *argcp = argc;
 582 }
 583
 584
 585 static char *
 586 update_options(char *opts, char *fstab, int curflags)
 587 {
 588         char *o, *p;
 589         char *cur;
 590         char *expopt, *newopt, *tmpopt;
 591
 592         if (opts == NULL)
 593                 return xstrdup("");
 594
 595         /* remove meta options from list */
 596         remopt(fstab, MOUNT_META_OPTION_FSTAB);
 597         remopt(fstab, MOUNT_META_OPTION_CURRENT);
 598         cur = flags2opts(curflags);
 599
 600         /*
 601          * Expand all meta-options passed to us first.
 602          */
 603         expopt = NULL;
 604         for (p = opts; (o = strsep(&p, ",")) != NULL;) {
 605                 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
 606                         expopt = catopt(expopt, fstab);
 607                 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
 608                         expopt = catopt(expopt, cur);
 609                 else
 610                         expopt = catopt(expopt, o);
 611         }
 612         free(cur);
 613         free(opts);
 614
 615         /*
 616          * Remove previous contradictory arguments. Given option "foo" we
 617          * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
 618          * and "foo" - so we can deal with possible options like "notice".
 619          */
 620         newopt = NULL;
 621         for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
 622                 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
 623                         errx(1, "malloc failed");
 624
 625                 strcpy(tmpopt, "no");
 626                 strcat(tmpopt, o);
 627                 remopt(newopt, tmpopt);
 628                 free(tmpopt);
 629
 630                 if (strncmp("no", o, 2) == 0)
 631                         remopt(newopt, o+2);
 632
 633                 newopt = catopt(newopt, o);
 634         }
 635         free(expopt);
 636
 637         return newopt;
 638 }
 639
 640 static void
 641 remopt(char *string, const char *opt)
 642 {
 643         char *o, *p, *r;
 644
 645         if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
 646                 return;
 647
 648         r = string;
 649
 650         for (p = string; (o = strsep(&p, ",")) != NULL;) {
 651                 if (strcmp(opt, o) != 0) {
 652                         if (*r == ',' && *o != '\0')
 653                                 r++;
 654                         while ((*r++ = *o++) != '\0')
 655                             ;
 656                         *--r = ',';
 657                 }
 658         }
 659         *r = '\0';
 660 }
 661
 662 static void
 663 usage(void)
 664 {
 665
 666         fprintf(stderr, "%s\n%s\n%s\n",
 667 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node",
 668 "       mount [-adfpruvw] [-o options] [-t ufs | external_type]",
 669 "       mount [-dfpruvw] special | node");
 670         exit(1);
 671 }
 672
 673 static void
 674 putfsent(const struct statfs *ent)
 675 {
 676         struct fstab *fst;
 677         char *opts;
 678
 679         opts = flags2opts(ent->f_flags);
 680         printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
 681             ent->f_fstypename, opts);
 682         free(opts);
 683
 684         if ((fst = getfsspec(ent->f_mntfromname)))
 685                 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 686         else if ((fst = getfsfile(ent->f_mntonname)))
 687                 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 688         else if (strcmp(ent->f_fstypename, "ufs") == 0) {
 689                 if (strcmp(ent->f_mntonname, "/") == 0)
 690                         printf("\t1 1\n");
 691                 else
 692                         printf("\t2 2\n");
 693         } else
 694                 printf("\t0 0\n");
 695 }
 696
 697
 698 static char *
 699 flags2opts(int flags)
 700 {
 701         char *res;
 702
 703         res = NULL;
 704
 705         res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
 706
 707         if (flags & MNT_SYNCHRONOUS)    res = catopt(res, "sync");
 708         if (flags & MNT_NOEXEC)         res = catopt(res, "noexec");
 709         if (flags & MNT_NOSUID)         res = catopt(res, "nosuid");
 710         if (flags & MNT_NODEV)          res = catopt(res, "nodev");
 711         if (flags & MNT_UNION)          res = catopt(res, "union");
 712         if (flags & MNT_ASYNC)          res = catopt(res, "async");
 713         if (flags & MNT_NOATIME)        res = catopt(res, "noatime");
 714         if (flags & MNT_NOCLUSTERR)     res = catopt(res, "noclusterr");
 715         if (flags & MNT_NOCLUSTERW)     res = catopt(res, "noclusterw");
 716         if (flags & MNT_NOSYMFOLLOW)    res = catopt(res, "nosymfollow");
 717         if (flags & MNT_SUIDDIR)        res = catopt(res, "suiddir");
 718
 719         return res;
 720 }
 721
 722 static char*
 723 xstrdup(const char *str)
 724 {
 725         char* ret = strdup(str);
 726         if(ret == NULL) {
 727                 errx(1, "strdup failed (could not allocate memory)");
 728         }
 729         return ret;
 730 }