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 <libutil.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
  55 #include "extern.h"
  56 #include "mntopts.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
  83 /* Map from mount options to printable formats. */
  84 static struct opt {
  85         int o_opt;
  86         const char *o_name;
  87 } optnames[] = {
  88         { MNT_ASYNC,            "asynchronous" },
  89         { MNT_EXPORTED,         "NFS exported" },
  90         { MNT_LOCAL,            "local" },
  91         { MNT_NOATIME,          "noatime" },
  92         { MNT_NODEV,            "nodev" },
  93         { MNT_NOEXEC,           "noexec" },
  94         { MNT_NOSUID,           "nosuid" },
  95         { MNT_NOSYMFOLLOW,      "nosymfollow" },
  96         { MNT_QUOTA,            "with quotas" },
  97         { MNT_RDONLY,           "read-only" },
  98         { MNT_SYNCHRONOUS,      "synchronous" },
  99         { MNT_UNION,            "union" },
 100         { MNT_NOCLUSTERR,       "noclusterr" },
 101         { MNT_NOCLUSTERW,       "noclusterw" },
 102         { MNT_SUIDDIR,          "suiddir" },
 103         { MNT_SOFTDEP,          "soft-updates" },
 104         { MNT_IGNORE,           "ignore" },
 105         { 0, NULL }
 106 };
 107
 108 /*
 109  * List of VFS types that can be remounted without becoming mounted on top
 110  * of each other.
 111  * XXX Is this list correct?
 112  */
 113 static const char *
 114 remountable_fs_names[] = {
 115         "ufs", "ffs", "ext2fs",
 116         0
 117 };
 118
 119 int
 120 main(int argc, char **argv)
 121 {
 122         const char *mntfromname, **vfslist, *vfstype;
 123         struct fstab *fs;
 124         struct statfs *mntbuf;
 125         FILE *mountdfp;
 126         pid_t pid;
 127         int all, ch, i, init_flags, mntsize, rval, have_fstab;
 128         char *options;
 129
 130         all = init_flags = 0;
 131         options = NULL;
 132         vfslist = NULL;
 133         vfstype = "ufs";
 134         while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
 135                 switch (ch) {
 136                 case 'a':
 137                         all = 1;
 138                         break;
 139                 case 'd':
 140                         debug = 1;
 141                         break;
 142                 case 'f':
 143                         init_flags |= MNT_FORCE;
 144                         break;
 145                 case 'o':
 146                         if (*optarg)
 147                                 options = catopt(options, optarg);
 148                         break;
 149                 case 'p':
 150                         fstab_style = 1;
 151                         verbose = 1;
 152                         break;
 153                 case 'r':
 154                         options = catopt(options, "ro");
 155                         break;
 156                 case 't':
 157                         if (vfslist != NULL)
 158                                 errx(1, "only one -t option may be specified");
 159                         vfslist = makevfslist(optarg);
 160                         vfstype = optarg;
 161                         break;
 162                 case 'u':
 163                         init_flags |= MNT_UPDATE;
 164                         break;
 165                 case 'v':
 166                         verbose = 1;
 167                         break;
 168                 case 'w':
 169                         options = catopt(options, "noro");
 170                         break;
 171                 case '?':
 172                 default:
 173                         usage();
 174                         /* NOTREACHED */
 175                 }
 176         argc -= optind;
 177         argv += optind;
 178
 179 #define BADTYPE(type)                                                   \
 180         (strcmp(type, FSTAB_RO) &&                                      \
 181             strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
 182
 183         rval = 0;
 184         switch (argc) {
 185         case 0:
 186                 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
 187                         err(1, "getmntinfo");
 188                 if (all) {
 189                         while ((fs = getfsent()) != NULL) {
 190                                 if (BADTYPE(fs->fs_type))
 191                                         continue;
 192                                 if (checkvfsname(fs->fs_vfstype, vfslist))
 193                                         continue;
 194                                 if (hasopt(fs->fs_mntops, "noauto"))
 195                                         continue;
 196                                 if (!(init_flags & MNT_UPDATE) &&
 197                                     ismounted(fs, mntbuf, mntsize))
 198                                         continue;
 199                                 options = update_options(options,
 200                                     fs->fs_mntops, mntbuf->f_flags);
 201                                 if (mountfs(fs->fs_vfstype, fs->fs_spec,
 202                                     fs->fs_file, init_flags, options,
 203                                     fs->fs_mntops))
 204                                         rval = 1;
 205                         }
 206                 } else if (fstab_style) {
 207                         for (i = 0; i < mntsize; i++) {
 208                                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 209                                         continue;
 210                                 putfsent(&mntbuf[i]);
 211                         }
 212                 } else {
 213                         for (i = 0; i < mntsize; i++) {
 214                                 if (checkvfsname(mntbuf[i].f_fstypename,
 215                                     vfslist))
 216                                         continue;
 217                                 prmount(&mntbuf[i]);
 218                         }
 219                 }
 220                 exit(rval);
 221         case 1:
 222                 if (vfslist != NULL)
 223                         usage();
 224
 225                 rmslashes(*argv, *argv);
 226
 227                 if (init_flags & MNT_UPDATE) {
 228                         mntfromname = NULL;
 229                         have_fstab = 0;
 230                         if ((mntbuf = getmntpt(*argv)) == NULL)
 231                                 errx(1, "not currently mounted %s", *argv);
 232                         /*
 233                          * Only get the mntflags from fstab if both mntpoint
 234                          * and mntspec are identical. Also handle the special
 235                          * case where just '/' is mounted and 'spec' is not
 236                          * identical with the one from fstab ('/dev' is missing
 237                          * in the spec-string at boot-time).
 238                          */
 239                         if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
 240                                 if (strcmp(fs->fs_spec,
 241                                     mntbuf->f_mntfromname) == 0 &&
 242                                     strcmp(fs->fs_file,
 243                                     mntbuf->f_mntonname) == 0) {
 244                                         have_fstab = 1;
 245                                         mntfromname = mntbuf->f_mntfromname;
 246                                 } else if (argv[0][0] == '/' &&
 247                                     argv[0][1] == '\0') {
 248                                         fs = getfsfile("/");
 249                                         have_fstab = 1;
 250                                         mntfromname = fs->fs_spec;
 251                                 }
 252                         }
 253                         if (have_fstab) {
 254                                 options = update_options(options, fs->fs_mntops,
 255                                     mntbuf->f_flags);
 256                         } else {
 257                                 mntfromname = mntbuf->f_mntfromname;
 258                                 options = update_options(options, NULL,
 259                                     mntbuf->f_flags);
 260                         }
 261                         rval = mountfs(mntbuf->f_fstypename, mntfromname,
 262                             mntbuf->f_mntonname, init_flags, options, 0);
 263                         break;
 264                 }
 265                 if ((fs = getfsfile(*argv)) == NULL &&
 266                     (fs = getfsspec(*argv)) == NULL)
 267                         errx(1, "%s: unknown special file or file system",
 268                             *argv);
 269                 if (BADTYPE(fs->fs_type))
 270                         errx(1, "%s has unknown file system type",
 271                             *argv);
 272                 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
 273                     init_flags, options, fs->fs_mntops);
 274                 break;
 275         case 2:
 276                 /*
 277                  * If -t flag has not been specified, the path cannot be
 278                  * found, spec contains either a ':' or a '@', and the
 279                  * spec is not a file with those characters, then assume
 280                  * that an NFS filesystem is being specified ala Sun.
 281                  */
 282                 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
 283                     access(argv[0], 0) == -1)
 284                         vfstype = "nfs";
 285                 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
 286                                init_flags, options, NULL);
 287                 break;
 288         default:
 289                 usage();
 290                 /* NOTREACHED */
 291         }
 292
 293         /*
 294          * If the mount was successfully, and done by root, tell mountd the
 295          * good news.  Pid checks are probably unnecessary, but don't hurt.
 296          */
 297         if (rval == 0 && getuid() == 0 &&
 298             (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
 299                 if (fscanf(mountdfp, "%d", &pid) == 1 &&
 300                      pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
 301                         err(1, "signal mountd");
 302                 fclose(mountdfp);
 303         }
 304
 305         exit(rval);
 306 }
 307
 308 static int
 309 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
 310 {
 311         int i;
 312
 313         if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
 314                 /* the root file system can always be remounted */
 315                 return (0);
 316
 317         for (i = mntsize - 1; i >= 0; --i)
 318                 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
 319                     (!isremountable(fs->fs_vfstype) ||
 320                      strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
 321                         return (1);
 322         return (0);
 323 }
 324
 325 static int
 326 isremountable(const char *vfsname)
 327 {
 328         const char **cp;
 329
 330         for (cp = remountable_fs_names; *cp; cp++)
 331                 if (strcmp(*cp, vfsname) == 0)
 332                         return (1);
 333         return (0);
 334 }
 335
 336 static int
 337 hasopt(const char *mntopts, const char *option)
 338 {
 339         int negative, found;
 340         char *opt, *optbuf;
 341
 342         if (option[0] == 'n' && option[1] == 'o') {
 343                 negative = 1;
 344                 option += 2;
 345         } else
 346                 negative = 0;
 347         optbuf = xstrdup(mntopts);
 348         found = 0;
 349         for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
 350                 if (opt[0] == 'n' && opt[1] == 'o') {
 351                         if (!strcasecmp(opt + 2, option))
 352                                 found = negative;
 353                 } else if (!strcasecmp(opt, option))
 354                         found = !negative;
 355         }
 356         free(optbuf);
 357         return (found);
 358 }
 359
 360 static int
 361 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
 362         const char *options, const char *mntopts)
 363 {
 364         /* List of directories containing mount_xxx subcommands. */
 365         static const char *edirs[] = {
 366                 _PATH_SBIN,
 367                 _PATH_USRSBIN,
 368                 NULL
 369         };
 370         const char *argv[100], **edir;
 371         struct statfs sf;
 372         pid_t pid;
 373         int argc, i, status;
 374         char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
 375
 376 #if __GNUC__
 377         (void)&optbuf;
 378         (void)&name;
 379 #endif
 380
 381         /* resolve the mountpoint with realpath(3) */
 382         checkpath(name, mntpath);
 383         name = mntpath;
 384
 385         if (mntopts == NULL)
 386                 mntopts = "";
 387         if (options == NULL) {
 388                 if (*mntopts == '\0') {
 389                         options = "rw";
 390                 } else {
 391                         options = mntopts;
 392                         mntopts = "";
 393                 }
 394         }
 395         optbuf = catopt(xstrdup(mntopts), options);
 396
 397         if (strcmp(name, "/") == 0)
 398                 flags |= MNT_UPDATE;
 399         if (flags & MNT_FORCE)
 400                 optbuf = catopt(optbuf, "force");
 401         if (flags & MNT_RDONLY)
 402                 optbuf = catopt(optbuf, "ro");
 403         /*
 404          * XXX
 405          * The mount_mfs (newfs) command uses -o to select the
 406          * optimization mode.  We don't pass the default "-o rw"
 407          * for that reason.
 408          */
 409         if (flags & MNT_UPDATE)
 410                 optbuf = catopt(optbuf, "update");
 411
 412         argc = 0;
 413         argv[argc++] = vfstype;
 414         mangle(optbuf, &argc, argv);
 415         argv[argc++] = spec;
 416         argv[argc++] = name;
 417         argv[argc] = NULL;
 418
 419         if (debug) {
 420                 printf("exec: mount_%s", vfstype);
 421                 for (i = 1; i < argc; i++)
 422                         printf(" %s", argv[i]);
 423                 printf("\n");
 424                 return (0);
 425         }
 426
 427         switch (pid = fork()) {
 428         case -1:                                /* Error. */
 429                 warn("fork");
 430                 free(optbuf);
 431                 return (1);
 432         case 0:                                 /* Child. */
 433                 if (strcmp(vfstype, "ufs") == 0)
 434                         exit(mount_ufs(argc, argv));
 435
 436                 /* Go find an executable. */
 437                 for (edir = edirs; *edir; edir++) {
 438                         snprintf(execname,
 439                             sizeof(execname), "%s/mount_%s", *edir, vfstype);
 440                         execv(execname, __DECONST(char * const *, argv));
 441                 }
 442                 if (errno == ENOENT) {
 443                         int len = 0;
 444                         char *cp;
 445                         for (edir = edirs; *edir; edir++)
 446                                 len += strlen(*edir) + 2;       /* ", " */
 447                         if ((cp = malloc(len)) == NULL)
 448                                 errx(1, "malloc failed");
 449                         cp[0] = '\0';
 450                         for (edir = edirs; *edir; edir++) {
 451                                 strcat(cp, *edir);
 452                                 if (edir[1] != NULL)
 453                                         strcat(cp, ", ");
 454                         }
 455                         warn("exec mount_%s not found in %s", vfstype, cp);
 456                 }
 457                 exit(1);
 458                 /* NOTREACHED */
 459         default:                                /* Parent. */
 460                 free(optbuf);
 461
 462                 if (waitpid(pid, &status, 0) < 0) {
 463                         warn("waitpid");
 464                         return (1);
 465                 }
 466
 467                 if (WIFEXITED(status)) {
 468                         if (WEXITSTATUS(status) != 0)
 469                                 return (WEXITSTATUS(status));
 470                 } else if (WIFSIGNALED(status)) {
 471                         warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
 472                         return (1);
 473                 }
 474
 475                 if (verbose) {
 476                         if (statfs(name, &sf) < 0) {
 477                                 warn("statfs %s", name);
 478                                 return (1);
 479                         }
 480                         if (fstab_style)
 481                                 putfsent(&sf);
 482                         else
 483                                 prmount(&sf);
 484                 }
 485                 break;
 486         }
 487
 488         return (0);
 489 }
 490
 491 static void
 492 prmount(struct statfs *sfp)
 493 {
 494         int flags;
 495         struct opt *o;
 496         struct passwd *pw;
 497
 498         printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
 499             sfp->f_fstypename);
 500
 501         flags = sfp->f_flags & MNT_VISFLAGMASK;
 502         for (o = optnames; flags && o->o_opt; o++)
 503                 if (flags & o->o_opt) {
 504                         printf(", %s", o->o_name);
 505                         flags &= ~o->o_opt;
 506                 }
 507         if (sfp->f_owner) {
 508                 printf(", mounted by ");
 509                 if ((pw = getpwuid(sfp->f_owner)) != NULL)
 510                         printf("%s", pw->pw_name);
 511                 else
 512                         printf("%d", sfp->f_owner);
 513         }
 514         if (verbose) {
 515                 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
 516                         printf(", writes: sync %ld async %ld",
 517                             sfp->f_syncwrites, sfp->f_asyncwrites);
 518                 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
 519                         printf(", reads: sync %ld async %ld",
 520                             sfp->f_syncreads, sfp->f_asyncreads);
 521         }
 522         printf(")\n");
 523 }
 524
 525 static struct statfs *
 526 getmntpt(const char *name)
 527 {
 528         struct statfs *mntbuf;
 529         int i, mntsize;
 530
 531         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 532         for (i = mntsize - 1; i >= 0; i--) {
 533                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
 534                     strcmp(mntbuf[i].f_mntonname, name) == 0)
 535                         return (&mntbuf[i]);
 536         }
 537         return (NULL);
 538 }
 539
 540 static char *
 541 catopt(char *s0, const char *s1)
 542 {
 543         size_t i;
 544         char *cp;
 545
 546         if (s1 == NULL || *s1 == '\0')
 547                 return s0;
 548
 549         if (s0 && *s0) {
 550                 i = strlen(s0) + strlen(s1) + 1 + 1;
 551                 if ((cp = malloc(i)) == NULL)
 552                         errx(1, "malloc failed");
 553                 snprintf(cp, i, "%s,%s", s0, s1);
 554         } else
 555                 cp = xstrdup(s1);
 556
 557         if (s0)
 558                 free(s0);
 559         return (cp);
 560 }
 561
 562 static void
 563 mangle(char *options, int *argcp, const char **argv)
 564 {
 565         char *p, *s;
 566         int argc;
 567
 568         argc = *argcp;
 569         for (s = options; (p = strsep(&s, ",")) != NULL;)
 570                 if (*p != '\0') {
 571                         if (*p == '-') {
 572                                 argv[argc++] = p;
 573                                 p = strchr(p, '=');
 574                                 if (p) {
 575                                         *p = '\0';
 576                                         argv[argc++] = p+1;
 577                                 }
 578                         } else if (strcmp(p, "rw") != 0) {
 579                                 argv[argc++] = "-o";
 580                                 argv[argc++] = p;
 581                         }
 582                 }
 583
 584         *argcp = argc;
 585 }
 586
 587
 588 static char *
 589 update_options(char *opts, char *fstab, int curflags)
 590 {
 591         char *o, *p;
 592         char *cur;
 593         char *expopt, *newopt, *tmpopt;
 594
 595         if (opts == NULL)
 596                 return xstrdup("");
 597
 598         /* remove meta options from list */
 599         remopt(fstab, MOUNT_META_OPTION_FSTAB);
 600         remopt(fstab, MOUNT_META_OPTION_CURRENT);
 601         cur = flags2opts(curflags);
 602
 603         /*
 604          * Expand all meta-options passed to us first.
 605          */
 606         expopt = NULL;
 607         for (p = opts; (o = strsep(&p, ",")) != NULL;) {
 608                 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
 609                         expopt = catopt(expopt, fstab);
 610                 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
 611                         expopt = catopt(expopt, cur);
 612                 else
 613                         expopt = catopt(expopt, o);
 614         }
 615         free(cur);
 616         free(opts);
 617
 618         /*
 619          * Remove previous contradictory arguments. Given option "foo" we
 620          * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
 621          * and "foo" - so we can deal with possible options like "notice".
 622          */
 623         newopt = NULL;
 624         for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
 625                 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
 626                         errx(1, "malloc failed");
 627
 628                 strcpy(tmpopt, "no");
 629                 strcat(tmpopt, o);
 630                 remopt(newopt, tmpopt);
 631                 free(tmpopt);
 632
 633                 if (strncmp("no", o, 2) == 0)
 634                         remopt(newopt, o+2);
 635
 636                 newopt = catopt(newopt, o);
 637         }
 638         free(expopt);
 639
 640         return newopt;
 641 }
 642
 643 static void
 644 remopt(char *string, const char *opt)
 645 {
 646         char *o, *p, *r;
 647
 648         if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
 649                 return;
 650
 651         r = string;
 652
 653         for (p = string; (o = strsep(&p, ",")) != NULL;) {
 654                 if (strcmp(opt, o) != 0) {
 655                         if (*r == ',' && *o != '\0')
 656                                 r++;
 657                         while ((*r++ = *o++) != '\0')
 658                             ;
 659                         *--r = ',';
 660                 }
 661         }
 662         *r = '\0';
 663 }
 664
 665 static void
 666 usage(void)
 667 {
 668
 669         fprintf(stderr, "%s\n%s\n%s\n",
 670 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node",
 671 "       mount [-adfpruvw] [-o options] [-t ufs | external_type]",
 672 "       mount [-dfpruvw] special | node");
 673         exit(1);
 674 }
 675
 676 /*
 677  * Prints the default values for dump frequency and pass number of fsck.
 678  * This happens when mount(8) is called with -p and there is no fstab file
 679  * or there is but the values aren't specified.
 680  */
 681 static void
 682 printdefvals(const struct statfs *ent)
 683 {
 684         if (strcmp(ent->f_fstypename, "ufs") == 0) {
 685                 if (strcmp(ent->f_mntonname, "/") == 0)
 686                         printf("\t1 1\n");
 687                 else
 688                         printf("\t2 2\n");
 689         } else {
 690                 printf("\t0 0\n");
 691         }
 692 }
 693
 694 static void
 695 putfsent(const struct statfs *ent)
 696 {
 697         struct stat sb;
 698         struct fstab *fst;
 699         char *opts;
 700
 701         opts = flags2opts(ent->f_flags);
 702         printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
 703             ent->f_fstypename, opts);
 704         free(opts);
 705
 706         /*
 707          * If fstab file is missing don't call getfsspec() or getfsfile()
 708          * at all, because the same warning will be printed twice for every
 709          * mounted filesystem.
 710          */
 711         if (stat(_PATH_FSTAB, &sb) != -1) {
 712                 if ((fst = getfsspec(ent->f_mntfromname)))
 713                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 714                 else if ((fst = getfsfile(ent->f_mntonname)))
 715                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 716                 else
 717                         printdefvals(ent);
 718         } else {
 719                 printdefvals(ent);
 720         }
 721 }
 722
 723
 724 static char *
 725 flags2opts(int flags)
 726 {
 727         char *res;
 728
 729         res = NULL;
 730
 731         res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
 732
 733         if (flags & MNT_SYNCHRONOUS)    res = catopt(res, "sync");
 734         if (flags & MNT_NOEXEC)         res = catopt(res, "noexec");
 735         if (flags & MNT_NOSUID)         res = catopt(res, "nosuid");
 736         if (flags & MNT_NODEV)          res = catopt(res, "nodev");
 737         if (flags & MNT_UNION)          res = catopt(res, "union");
 738         if (flags & MNT_ASYNC)          res = catopt(res, "async");
 739         if (flags & MNT_NOATIME)        res = catopt(res, "noatime");
 740         if (flags & MNT_NOCLUSTERR)     res = catopt(res, "noclusterr");
 741         if (flags & MNT_NOCLUSTERW)     res = catopt(res, "noclusterw");
 742         if (flags & MNT_NOSYMFOLLOW)    res = catopt(res, "nosymfollow");
 743         if (flags & MNT_SUIDDIR)        res = catopt(res, "suiddir");
 744         if (flags & MNT_IGNORE)         res = catopt(res, "ignore");
 745
 746         return res;
 747 }
 748
 749 static char*
 750 xstrdup(const char *str)
 751 {
 752         char* ret = strdup(str);
 753         if(ret == NULL) {
 754                 errx(1, "strdup failed (could not allocate memory)");
 755         }
 756         return ret;
 757 }