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   printdefvals(const struct statfs *);
  76 static void   prmount(struct statfs *);
  77 static void   putfsent(const struct statfs *);
  78 static void   usage(void);
  79 static char  *flags2opts(int);
  80 static char  *xstrdup(const char *str);
  81
  82 /* Map from mount options to printable formats. */
  83 static struct opt {
  84         int o_opt;
  85         const char *o_name;
  86 } optnames[] = {
  87         { MNT_ASYNC,            "asynchronous" },
  88         { MNT_EXPORTED,         "NFS exported" },
  89         { MNT_LOCAL,            "local" },
  90         { MNT_NOATIME,          "noatime" },
  91         { MNT_NODEV,            "nodev" },
  92         { MNT_NOEXEC,           "noexec" },
  93         { MNT_NOSUID,           "nosuid" },
  94         { MNT_NOSYMFOLLOW,      "nosymfollow" },
  95         { MNT_QUOTA,            "with quotas" },
  96         { MNT_RDONLY,           "read-only" },
  97         { MNT_SYNCHRONOUS,      "synchronous" },
  98         { MNT_UNION,            "union" },
  99         { MNT_NOCLUSTERR,       "noclusterr" },
 100         { MNT_NOCLUSTERW,       "noclusterw" },
 101         { MNT_SUIDDIR,          "suiddir" },
 102         { MNT_SOFTDEP,          "soft-updates" },
 103         { 0, NULL }
 104 };
 105
 106 /*
 107  * List of VFS types that can be remounted without becoming mounted on top
 108  * of each other.
 109  * XXX Is this list correct?
 110  */
 111 static const char *
 112 remountable_fs_names[] = {
 113         "ufs", "ffs", "ext2fs",
 114         0
 115 };
 116
 117 int
 118 main(int argc, char **argv)
 119 {
 120         const char *mntfromname, **vfslist, *vfstype;
 121         struct fstab *fs;
 122         struct statfs *mntbuf;
 123         FILE *mountdfp;
 124         pid_t pid;
 125         int all, ch, i, init_flags, mntsize, rval, have_fstab;
 126         char *options;
 127
 128         all = init_flags = 0;
 129         options = NULL;
 130         vfslist = NULL;
 131         vfstype = "ufs";
 132         while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
 133                 switch (ch) {
 134                 case 'a':
 135                         all = 1;
 136                         break;
 137                 case 'd':
 138                         debug = 1;
 139                         break;
 140                 case 'f':
 141                         init_flags |= MNT_FORCE;
 142                         break;
 143                 case 'o':
 144                         if (*optarg)
 145                                 options = catopt(options, optarg);
 146                         break;
 147                 case 'p':
 148                         fstab_style = 1;
 149                         verbose = 1;
 150                         break;
 151                 case 'r':
 152                         options = catopt(options, "ro");
 153                         break;
 154                 case 't':
 155                         if (vfslist != NULL)
 156                                 errx(1, "only one -t option may be specified");
 157                         vfslist = makevfslist(optarg);
 158                         vfstype = optarg;
 159                         break;
 160                 case 'u':
 161                         init_flags |= MNT_UPDATE;
 162                         break;
 163                 case 'v':
 164                         verbose = 1;
 165                         break;
 166                 case 'w':
 167                         options = catopt(options, "noro");
 168                         break;
 169                 case '?':
 170                 default:
 171                         usage();
 172                         /* NOTREACHED */
 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, spec contains either a ':' or a '@', and the
 277                  * spec is not a file with those characters, then assume
 278                  * that an NFS filesystem is being specified ala Sun.
 279                  */
 280                 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
 281                     access(argv[0], 0) == -1)
 282                         vfstype = "nfs";
 283                 rval = mountfs(vfstype,
 284                     argv[0], argv[1], init_flags, options, NULL);
 285                 break;
 286         default:
 287                 usage();
 288                 /* NOTREACHED */
 289         }
 290
 291         /*
 292          * If the mount was successfully, and done by root, tell mountd the
 293          * good news.  Pid checks are probably unnecessary, but don't hurt.
 294          */
 295         if (rval == 0 && getuid() == 0 &&
 296             (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
 297                 if (fscanf(mountdfp, "%d", &pid) == 1 &&
 298                      pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
 299                         err(1, "signal mountd");
 300                 fclose(mountdfp);
 301         }
 302
 303         exit(rval);
 304 }
 305
 306 static int
 307 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
 308 {
 309         int i;
 310
 311         if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
 312                 /* the root file system can always be remounted */
 313                 return (0);
 314
 315         for (i = mntsize - 1; i >= 0; --i)
 316                 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
 317                     (!isremountable(fs->fs_vfstype) ||
 318                      strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
 319                         return (1);
 320         return (0);
 321 }
 322
 323 static int
 324 isremountable(const char *vfsname)
 325 {
 326         const char **cp;
 327
 328         for (cp = remountable_fs_names; *cp; cp++)
 329                 if (strcmp(*cp, vfsname) == 0)
 330                         return (1);
 331         return (0);
 332 }
 333
 334 static int
 335 hasopt(const char *mntopts, const char *option)
 336 {
 337         int negative, found;
 338         char *opt, *optbuf;
 339
 340         if (option[0] == 'n' && option[1] == 'o') {
 341                 negative = 1;
 342                 option += 2;
 343         } else
 344                 negative = 0;
 345         optbuf = xstrdup(mntopts);
 346         found = 0;
 347         for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
 348                 if (opt[0] == 'n' && opt[1] == 'o') {
 349                         if (!strcasecmp(opt + 2, option))
 350                                 found = negative;
 351                 } else if (!strcasecmp(opt, option))
 352                         found = !negative;
 353         }
 354         free(optbuf);
 355         return (found);
 356 }
 357
 358 static int
 359 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
 360         const char *options, const char *mntopts)
 361 {
 362         /* List of directories containing mount_xxx subcommands. */
 363         static const char *edirs[] = {
 364                 _PATH_SBIN,
 365                 _PATH_USRSBIN,
 366                 NULL
 367         };
 368         const char *argv[100], **edir;
 369         struct statfs sf;
 370         pid_t pid;
 371         int argc, i, status;
 372         char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
 373
 374 #if __GNUC__
 375         (void)&optbuf;
 376         (void)&name;
 377 #endif
 378
 379         /* resolve the mountpoint with realpath(3) */
 380         checkpath(name, mntpath);
 381         name = mntpath;
 382
 383         if (mntopts == NULL)
 384                 mntopts = "";
 385         if (options == NULL) {
 386                 if (*mntopts == '\0') {
 387                         options = "rw";
 388                 } else {
 389                         options = mntopts;
 390                         mntopts = "";
 391                 }
 392         }
 393         optbuf = catopt(xstrdup(mntopts), options);
 394
 395         if (strcmp(name, "/") == 0)
 396                 flags |= MNT_UPDATE;
 397         if (flags & MNT_FORCE)
 398                 optbuf = catopt(optbuf, "force");
 399         if (flags & MNT_RDONLY)
 400                 optbuf = catopt(optbuf, "ro");
 401         /*
 402          * XXX
 403          * The mount_mfs (newfs) command uses -o to select the
 404          * optimization mode.  We don't pass the default "-o rw"
 405          * for that reason.
 406          */
 407         if (flags & MNT_UPDATE)
 408                 optbuf = catopt(optbuf, "update");
 409
 410         argc = 0;
 411         argv[argc++] = vfstype;
 412         mangle(optbuf, &argc, argv);
 413         argv[argc++] = spec;
 414         argv[argc++] = name;
 415         argv[argc] = NULL;
 416
 417         if (debug) {
 418                 printf("exec: mount_%s", vfstype);
 419                 for (i = 1; i < argc; i++)
 420                         printf(" %s", argv[i]);
 421                 printf("\n");
 422                 return (0);
 423         }
 424
 425         switch (pid = fork()) {
 426         case -1:                                /* Error. */
 427                 warn("fork");
 428                 free(optbuf);
 429                 return (1);
 430         case 0:                                 /* Child. */
 431                 if (strcmp(vfstype, "ufs") == 0)
 432                         exit(mount_ufs(argc, argv));
 433
 434                 /* Go find an executable. */
 435                 for (edir = edirs; *edir; edir++) {
 436                         snprintf(execname,
 437                             sizeof(execname), "%s/mount_%s", *edir, vfstype);
 438                         execv(execname, __DECONST(char * const *, argv));
 439                 }
 440                 if (errno == ENOENT) {
 441                         int len = 0;
 442                         char *cp;
 443                         for (edir = edirs; *edir; edir++)
 444                                 len += strlen(*edir) + 2;       /* ", " */
 445                         if ((cp = malloc(len)) == NULL)
 446                                 errx(1, "malloc failed");
 447                         cp[0] = '\0';
 448                         for (edir = edirs; *edir; edir++) {
 449                                 strcat(cp, *edir);
 450                                 if (edir[1] != NULL)
 451                                         strcat(cp, ", ");
 452                         }
 453                         warn("exec mount_%s not found in %s", vfstype, cp);
 454                 }
 455                 exit(1);
 456                 /* NOTREACHED */
 457         default:                                /* Parent. */
 458                 free(optbuf);
 459
 460                 if (waitpid(pid, &status, 0) < 0) {
 461                         warn("waitpid");
 462                         return (1);
 463                 }
 464
 465                 if (WIFEXITED(status)) {
 466                         if (WEXITSTATUS(status) != 0)
 467                                 return (WEXITSTATUS(status));
 468                 } else if (WIFSIGNALED(status)) {
 469                         warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
 470                         return (1);
 471                 }
 472
 473                 if (verbose) {
 474                         if (statfs(name, &sf) < 0) {
 475                                 warn("statfs %s", name);
 476                                 return (1);
 477                         }
 478                         if (fstab_style)
 479                                 putfsent(&sf);
 480                         else
 481                                 prmount(&sf);
 482                 }
 483                 break;
 484         }
 485
 486         return (0);
 487 }
 488
 489 static void
 490 prmount(struct statfs *sfp)
 491 {
 492         int flags;
 493         struct opt *o;
 494         struct passwd *pw;
 495
 496         printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
 497             sfp->f_fstypename);
 498
 499         flags = sfp->f_flags & MNT_VISFLAGMASK;
 500         for (o = optnames; flags && o->o_opt; o++)
 501                 if (flags & o->o_opt) {
 502                         printf(", %s", o->o_name);
 503                         flags &= ~o->o_opt;
 504                 }
 505         if (sfp->f_owner) {
 506                 printf(", mounted by ");
 507                 if ((pw = getpwuid(sfp->f_owner)) != NULL)
 508                         printf("%s", pw->pw_name);
 509                 else
 510                         printf("%d", sfp->f_owner);
 511         }
 512         if (verbose) {
 513                 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
 514                         printf(", writes: sync %ld async %ld",
 515                             sfp->f_syncwrites, sfp->f_asyncwrites);
 516                 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
 517                         printf(", reads: sync %ld async %ld",
 518                             sfp->f_syncreads, sfp->f_asyncreads);
 519         }
 520         printf(")\n");
 521 }
 522
 523 static struct statfs *
 524 getmntpt(const char *name)
 525 {
 526         struct statfs *mntbuf;
 527         int i, mntsize;
 528
 529         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 530         for (i = mntsize - 1; i >= 0; i--) {
 531                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
 532                     strcmp(mntbuf[i].f_mntonname, name) == 0)
 533                         return (&mntbuf[i]);
 534         }
 535         return (NULL);
 536 }
 537
 538 static char *
 539 catopt(char *s0, const char *s1)
 540 {
 541         size_t i;
 542         char *cp;
 543
 544         if (s1 == NULL || *s1 == '\0')
 545                 return s0;
 546
 547         if (s0 && *s0) {
 548                 i = strlen(s0) + strlen(s1) + 1 + 1;
 549                 if ((cp = malloc(i)) == NULL)
 550                         errx(1, "malloc failed");
 551                 snprintf(cp, i, "%s,%s", s0, s1);
 552         } else
 553                 cp = xstrdup(s1);
 554
 555         if (s0)
 556                 free(s0);
 557         return (cp);
 558 }
 559
 560 static void
 561 mangle(char *options, int *argcp, const char **argv)
 562 {
 563         char *p, *s;
 564         int argc;
 565
 566         argc = *argcp;
 567         for (s = options; (p = strsep(&s, ",")) != NULL;)
 568                 if (*p != '\0') {
 569                         if (*p == '-') {
 570                                 argv[argc++] = p;
 571                                 p = strchr(p, '=');
 572                                 if (p) {
 573                                         *p = '\0';
 574                                         argv[argc++] = p+1;
 575                                 }
 576                         } else if (strcmp(p, "rw") != 0) {
 577                                 argv[argc++] = "-o";
 578                                 argv[argc++] = p;
 579                         }
 580                 }
 581
 582         *argcp = argc;
 583 }
 584
 585
 586 static char *
 587 update_options(char *opts, char *fstab, int curflags)
 588 {
 589         char *o, *p;
 590         char *cur;
 591         char *expopt, *newopt, *tmpopt;
 592
 593         if (opts == NULL)
 594                 return xstrdup("");
 595
 596         /* remove meta options from list */
 597         remopt(fstab, MOUNT_META_OPTION_FSTAB);
 598         remopt(fstab, MOUNT_META_OPTION_CURRENT);
 599         cur = flags2opts(curflags);
 600
 601         /*
 602          * Expand all meta-options passed to us first.
 603          */
 604         expopt = NULL;
 605         for (p = opts; (o = strsep(&p, ",")) != NULL;) {
 606                 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
 607                         expopt = catopt(expopt, fstab);
 608                 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
 609                         expopt = catopt(expopt, cur);
 610                 else
 611                         expopt = catopt(expopt, o);
 612         }
 613         free(cur);
 614         free(opts);
 615
 616         /*
 617          * Remove previous contradictory arguments. Given option "foo" we
 618          * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
 619          * and "foo" - so we can deal with possible options like "notice".
 620          */
 621         newopt = NULL;
 622         for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
 623                 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
 624                         errx(1, "malloc failed");
 625
 626                 strcpy(tmpopt, "no");
 627                 strcat(tmpopt, o);
 628                 remopt(newopt, tmpopt);
 629                 free(tmpopt);
 630
 631                 if (strncmp("no", o, 2) == 0)
 632                         remopt(newopt, o+2);
 633
 634                 newopt = catopt(newopt, o);
 635         }
 636         free(expopt);
 637
 638         return newopt;
 639 }
 640
 641 static void
 642 remopt(char *string, const char *opt)
 643 {
 644         char *o, *p, *r;
 645
 646         if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
 647                 return;
 648
 649         r = string;
 650
 651         for (p = string; (o = strsep(&p, ",")) != NULL;) {
 652                 if (strcmp(opt, o) != 0) {
 653                         if (*r == ',' && *o != '\0')
 654                                 r++;
 655                         while ((*r++ = *o++) != '\0')
 656                             ;
 657                         *--r = ',';
 658                 }
 659         }
 660         *r = '\0';
 661 }
 662
 663 static void
 664 usage(void)
 665 {
 666
 667         fprintf(stderr, "%s\n%s\n%s\n",
 668 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node",
 669 "       mount [-adfpruvw] [-o options] [-t ufs | external_type]",
 670 "       mount [-dfpruvw] special | node");
 671         exit(1);
 672 }
 673
 674 /*
 675  * Prints the default values for dump frequency and pass number of fsck.
 676  * This happens when mount(8) is called with -p and there is no fstab file
 677  * or there is but the values aren't specified.
 678  */
 679 static void
 680 printdefvals(const struct statfs *ent)
 681 {
 682         if (strcmp(ent->f_fstypename, "ufs") == 0) {
 683                 if (strcmp(ent->f_mntonname, "/") == 0)
 684                         printf("\t1 1\n");
 685                 else
 686                         printf("\t2 2\n");
 687         } else {
 688                 printf("\t0 0\n");
 689         }
 690 }
 691
 692 static void
 693 putfsent(const struct statfs *ent)
 694 {
 695         struct stat sb;
 696         struct fstab *fst;
 697         char *opts;
 698
 699         opts = flags2opts(ent->f_flags);
 700         printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
 701             ent->f_fstypename, opts);
 702         free(opts);
 703
 704         /*
 705          * If fstab file is missing don't call getfsspec() or getfsfile()
 706          * at all, because the same warning will be printed twice for every
 707          * mounted filesystem.
 708          */
 709         if (stat(_PATH_FSTAB, &sb) != -1) {
 710                 if ((fst = getfsspec(ent->f_mntfromname)))
 711                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 712                 else if ((fst = getfsfile(ent->f_mntonname)))
 713                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 714                 else
 715                         printdefvals(ent);
 716         } else {
 717                 printdefvals(ent);
 718         }
 719 }
 720
 721
 722 static char *
 723 flags2opts(int flags)
 724 {
 725         char *res;
 726
 727         res = NULL;
 728
 729         res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
 730
 731         if (flags & MNT_SYNCHRONOUS)    res = catopt(res, "sync");
 732         if (flags & MNT_NOEXEC)         res = catopt(res, "noexec");
 733         if (flags & MNT_NOSUID)         res = catopt(res, "nosuid");
 734         if (flags & MNT_NODEV)          res = catopt(res, "nodev");
 735         if (flags & MNT_UNION)          res = catopt(res, "union");
 736         if (flags & MNT_ASYNC)          res = catopt(res, "async");
 737         if (flags & MNT_NOATIME)        res = catopt(res, "noatime");
 738         if (flags & MNT_NOCLUSTERR)     res = catopt(res, "noclusterr");
 739         if (flags & MNT_NOCLUSTERW)     res = catopt(res, "noclusterw");
 740         if (flags & MNT_NOSYMFOLLOW)    res = catopt(res, "nosymfollow");
 741         if (flags & MNT_SUIDDIR)        res = catopt(res, "suiddir");
 742
 743         return res;
 744 }
 745
 746 static char*
 747 xstrdup(const char *str)
 748 {
 749         char* ret = strdup(str);
 750         if(ret == NULL) {
 751                 errx(1, "strdup failed (could not allocate memory)");
 752         }
 753         return ret;
 754 }