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