sbin/mount/mount.c

   1 /*-
   2  * Copyright (c) 1980, 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)mount.c  8.25 (Berkeley) 5/8/95
  31  * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/mount.h>
  36 #include <sys/mountctl.h>
  37 #define DKTYPENAMES
  38 #include <sys/dtype.h>
  39 #include <sys/diskslice.h>
  40 #include <sys/stat.h>
  41 #include <sys/wait.h>
  42
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <fcntl.h>
  46 #include <fstab.h>
  47 #include <mntopts.h>
  48 #include <pwd.h>
  49 #include <signal.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <libutil.h>
  55
  56 #include "extern.h"
  57 #include "pathnames.h"
  58
  59 /* `meta' options */
  60 #define MOUNT_META_OPTION_FSTAB         "fstab"
  61 #define MOUNT_META_OPTION_CURRENT       "current"
  62
  63 int debug, fstab_style, verbose;
  64
  65 static char  *catopt(char *, const char *);
  66 static struct statfs
  67              *getmntpt(const char *);
  68 static int    hasopt(const char *, const char *);
  69 static int    ismounted(struct fstab *, struct statfs *, int);
  70 static int    isremountable(const char *);
  71 static void   mangle(char *, int *, const char **);
  72 static char  *update_options(char *, char *, int);
  73 static int    mountfs(const char *, const char *, const char *,
  74                       int, const char *, const char *);
  75 static void   remopt(char *, const char *);
  76 static void   printdefvals(const struct statfs *);
  77 static void   prmount(struct statfs *);
  78 static void   putfsent(const struct statfs *);
  79 static void   usage(void);
  80 static char  *flags2opts(int);
  81 static char  *xstrdup(const char *str);
  82 static void   checkdisklabel(const char *devpath, const char **vfstypep);
  83
  84 /*
  85  * List of VFS types that can be remounted without becoming mounted on top
  86  * of each other.
  87  * XXX Is this list correct?
  88  */
  89 static const char *remountable_fs_names[] = {
  90         "ufs", "ffs", "ext2fs", "hammer", "hammer2",
  91         NULL
  92 };
  93
  94 static void
  95 restart_mountd(void)
  96 {
  97         struct pidfh *pfh;
  98         pid_t mountdpid;
  99
 100         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
 101         if (pfh != NULL) {
 102                 /* Mountd is not running. */
 103                 pidfile_remove(pfh);
 104                 return;
 105         }
 106         if (errno != EEXIST) {
 107                 /* Cannot open pidfile for some reason. */
 108                 return;
 109         }
 110         /* We have mountd(8) PID in mountdpid varible, let's signal it. */
 111         if (kill(mountdpid, SIGUSR1) == -1)
 112                 err(1, "signal mountd");
 113 }
 114
 115 int
 116 main(int argc, char **argv)
 117 {
 118         const char *mntfromname, **vfslist, *vfstype;
 119         struct fstab *fs;
 120         struct statfs *mntbuf;
 121         int all, ch, i, init_flags, mntsize, rval, have_fstab;
 122         char *options;
 123
 124         all = init_flags = 0;
 125         options = NULL;
 126         vfslist = NULL;
 127         vfstype = "ufs";
 128         while ((ch = getopt(argc, argv, "adF:fo:prwt:uv")) != -1) {
 129                 switch (ch) {
 130                 case 'a':
 131                         all = 1;
 132                         break;
 133                 case 'd':
 134                         debug = 1;
 135                         break;
 136                 case 'F':
 137                         setfstab(optarg);
 138                         break;
 139                 case 'f':
 140                         init_flags |= MNT_FORCE;
 141                         break;
 142                 case 'o':
 143                         if (*optarg)
 144                                 options = catopt(options, optarg);
 145                         break;
 146                 case 'p':
 147                         fstab_style = 1;
 148                         verbose = 1;
 149                         break;
 150                 case 'r':
 151                         options = catopt(options, "ro");
 152                         break;
 153                 case 't':
 154                         if (vfslist != NULL)
 155                                 errx(1, "only one -t option may be specified");
 156                         vfslist = makevfslist(optarg);
 157                         vfstype = optarg;
 158                         break;
 159                 case 'u':
 160                         init_flags |= MNT_UPDATE;
 161                         break;
 162                 case 'v':
 163                         verbose = 1;
 164                         break;
 165                 case 'w':
 166                         options = catopt(options, "noro");
 167                         break;
 168                 case '?':
 169                 default:
 170                         usage();
 171                         /* NOTREACHED */
 172                 }
 173         }
 174         argc -= optind;
 175         argv += optind;
 176
 177 #define BADTYPE(type)                                                   \
 178         (strcmp(type, FSTAB_RO) &&                                      \
 179             strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
 180
 181         rval = 0;
 182         switch (argc) {
 183         case 0:
 184                 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
 185                         err(1, "getmntinfo");
 186                 if (all) {
 187                         while ((fs = getfsent()) != NULL) {
 188                                 if (BADTYPE(fs->fs_type))
 189                                         continue;
 190                                 if (checkvfsname(fs->fs_vfstype, vfslist))
 191                                         continue;
 192                                 if (hasopt(fs->fs_mntops, "noauto"))
 193                                         continue;
 194                                 if (!(init_flags & MNT_UPDATE) &&
 195                                     ismounted(fs, mntbuf, mntsize))
 196                                         continue;
 197                                 options = update_options(options,
 198                                     fs->fs_mntops, mntbuf->f_flags);
 199                                 if (mountfs(fs->fs_vfstype, fs->fs_spec,
 200                                     fs->fs_file, init_flags, options,
 201                                     fs->fs_mntops))
 202                                         rval = 1;
 203                         }
 204                 } else if (fstab_style) {
 205                         for (i = 0; i < mntsize; i++) {
 206                                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 207                                         continue;
 208                                 putfsent(&mntbuf[i]);
 209                         }
 210                 } else {
 211                         for (i = 0; i < mntsize; i++) {
 212                                 if (checkvfsname(mntbuf[i].f_fstypename,
 213                                     vfslist))
 214                                         continue;
 215                                 prmount(&mntbuf[i]);
 216                         }
 217                 }
 218                 exit(rval);
 219         case 1:
 220                 if (vfslist != NULL)
 221                         usage();
 222
 223                 rmslashes(*argv, *argv);
 224
 225                 if (init_flags & MNT_UPDATE) {
 226                         mntfromname = NULL;
 227                         have_fstab = 0;
 228                         if ((mntbuf = getmntpt(*argv)) == NULL)
 229                                 errx(1, "not currently mounted %s", *argv);
 230                         /*
 231                          * Only get the mntflags from fstab if both mntpoint
 232                          * and mntspec are identical. Also handle the special
 233                          * case where just '/' is mounted and 'spec' is not
 234                          * identical with the one from fstab ('/dev' is missing
 235                          * in the spec-string at boot-time).
 236                          */
 237                         if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
 238                                 if (strcmp(fs->fs_spec,
 239                                     mntbuf->f_mntfromname) == 0 &&
 240                                     strcmp(fs->fs_file,
 241                                     mntbuf->f_mntonname) == 0) {
 242                                         have_fstab = 1;
 243                                         mntfromname = mntbuf->f_mntfromname;
 244                                 } else if (argv[0][0] == '/' &&
 245                                     argv[0][1] == '\0') {
 246                                         fs = getfsfile("/");
 247                                         have_fstab = 1;
 248                                         mntfromname = fs->fs_spec;
 249                                 }
 250                         }
 251                         if (have_fstab) {
 252                                 options = update_options(options, fs->fs_mntops,
 253                                     mntbuf->f_flags);
 254                         } else {
 255                                 mntfromname = mntbuf->f_mntfromname;
 256                                 options = update_options(options, NULL,
 257                                     mntbuf->f_flags);
 258                         }
 259                         rval = mountfs(mntbuf->f_fstypename, mntfromname,
 260                             mntbuf->f_mntonname, init_flags, options, 0);
 261                         break;
 262                 }
 263                 if ((fs = getfsfile(*argv)) == NULL &&
 264                     (fs = getfsspec(*argv)) == NULL)
 265                         errx(1, "%s: unknown special file or file system",
 266                             *argv);
 267                 if (BADTYPE(fs->fs_type))
 268                         errx(1, "%s has unknown file system type",
 269                             *argv);
 270                 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
 271                     init_flags, options, fs->fs_mntops);
 272                 break;
 273         case 2:
 274                 /*
 275                  * If -t flag has not been specified, the path cannot be
 276                  * found.
 277                  *
 278                  * If the spec is not a file and contains a ':' then assume
 279                  * NFS.
 280                  *
 281                  * If the spec is not a file and contains a '@' then assume
 282                  * HAMMER2.  Note that there may not be a raw device
 283                  * specified in this situation.
 284                  *
 285                  * If the spec is a cdev attempt to extract the fstype from
 286                  * the label.
 287                  *
 288                  * When all else fails ufs is assumed.
 289                  */
 290                 if (vfslist == NULL) {
 291                         if (strpbrk(argv[0], ":") != NULL &&
 292                             access(argv[0], 0) == -1) {
 293                                 vfstype = "nfs";
 294                         } else if (strpbrk(argv[0], "@") != NULL &&
 295                                    access(argv[0], 0) == -1) {
 296                                 vfstype = "hammer2";
 297                         } else {
 298                                 checkdisklabel(argv[0], &vfstype);
 299                         }
 300                 }
 301
 302                 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
 303                                init_flags, options, NULL);
 304                 break;
 305         default:
 306                 usage();
 307                 /* NOTREACHED */
 308         }
 309
 310         /*
 311          * If the mount was successfully, and done by root, tell mountd the
 312          * good news.
 313          */
 314         if (rval == 0 && getuid() == 0)
 315                 restart_mountd();
 316
 317         exit(rval);
 318 }
 319
 320 static int
 321 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
 322 {
 323         int i;
 324
 325         if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
 326                 /* the root file system can always be remounted */
 327                 return (0);
 328
 329         for (i = mntsize - 1; i >= 0; --i)
 330                 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
 331                     (!isremountable(fs->fs_vfstype) ||
 332                      strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
 333                         return (1);
 334         return (0);
 335 }
 336
 337 static int
 338 isremountable(const char *vfsname)
 339 {
 340         const char **cp;
 341
 342         for (cp = remountable_fs_names; *cp; cp++)
 343                 if (strcmp(*cp, vfsname) == 0)
 344                         return (1);
 345         return (0);
 346 }
 347
 348 static int
 349 hasopt(const char *mntopts, const char *option)
 350 {
 351         int negative, found;
 352         char *opt, *optbuf;
 353
 354         if (option[0] == 'n' && option[1] == 'o') {
 355                 negative = 1;
 356                 option += 2;
 357         } else
 358                 negative = 0;
 359         optbuf = xstrdup(mntopts);
 360         found = 0;
 361         for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
 362                 if (opt[0] == 'n' && opt[1] == 'o') {
 363                         if (!strcasecmp(opt + 2, option))
 364                                 found = negative;
 365                 } else if (!strcasecmp(opt, option))
 366                         found = !negative;
 367         }
 368         free(optbuf);
 369         return (found);
 370 }
 371
 372 static int
 373 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
 374         const char *options, const char *mntopts)
 375 {
 376         /* List of directories containing mount_xxx subcommands. */
 377         static const char *edirs[] = {
 378                 _PATH_SBIN,
 379                 _PATH_USRSBIN,
 380                 NULL
 381         };
 382         const char *argv[100], **edir;
 383         struct statfs sf;
 384         pid_t pid;
 385         int argc, i, status;
 386         char *optbuf;
 387         char *argv0;
 388         char execname[MAXPATHLEN + 1];
 389         char mntpath[MAXPATHLEN];
 390
 391         /* resolve the mountpoint with realpath(3) */
 392         checkpath(name, mntpath);
 393         name = mntpath;
 394
 395         if (mntopts == NULL)
 396                 mntopts = "";
 397         if (options == NULL) {
 398                 if (*mntopts == '\0') {
 399                         options = "rw";
 400                 } else {
 401                         options = mntopts;
 402                         mntopts = "";
 403                 }
 404         }
 405         optbuf = catopt(xstrdup(mntopts), options);
 406
 407         if (strcmp(name, "/") == 0)
 408                 flags |= MNT_UPDATE;
 409         if (flags & MNT_FORCE)
 410                 optbuf = catopt(optbuf, "force");
 411         if (flags & MNT_RDONLY)
 412                 optbuf = catopt(optbuf, "ro");
 413         /*
 414          * XXX
 415          * The mount_mfs (newfs) command uses -o to select the
 416          * optimization mode.  We don't pass the default "-o rw"
 417          * for that reason.
 418          */
 419         if (flags & MNT_UPDATE)
 420                 optbuf = catopt(optbuf, "update");
 421
 422         asprintf(&argv0, "mount_%s", vfstype);
 423
 424         argc = 0;
 425         argv[argc++] = argv0;
 426         mangle(optbuf, &argc, argv);
 427         argv[argc++] = spec;
 428         argv[argc++] = name;
 429         argv[argc] = NULL;
 430
 431         if (debug) {
 432                 printf("exec: mount_%s", vfstype);
 433                 for (i = 1; i < argc; i++)
 434                         printf(" %s", argv[i]);
 435                 printf("\n");
 436                 return (0);
 437         }
 438
 439         switch (pid = fork()) {
 440         case -1:                                /* Error. */
 441                 warn("fork");
 442                 free(optbuf);
 443                 return (1);
 444         case 0:                                 /* Child. */
 445                 /* Go find an executable. */
 446                 for (edir = edirs; *edir; edir++) {
 447                         snprintf(execname, sizeof(execname),
 448                                  "%s/mount_%s", *edir, vfstype);
 449                         execv(execname, __DECONST(char * const *, argv));
 450                 }
 451                 if (errno == ENOENT) {
 452                         int len = 0;
 453                         char *cp;
 454                         for (edir = edirs; *edir; edir++)
 455                                 len += strlen(*edir) + 2;       /* ", " */
 456                         if ((cp = malloc(len)) == NULL)
 457                                 errx(1, "malloc failed");
 458                         cp[0] = '\0';
 459                         for (edir = edirs; *edir; edir++) {
 460                                 strcat(cp, *edir);
 461                                 if (edir[1] != NULL)
 462                                         strcat(cp, ", ");
 463                         }
 464                         warn("exec mount_%s not found in %s", vfstype, cp);
 465                 }
 466                 exit(1);
 467                 /* NOTREACHED */
 468         default:                                /* Parent. */
 469                 free(optbuf);
 470
 471                 if (waitpid(pid, &status, 0) < 0) {
 472                         warn("waitpid");
 473                         return (1);
 474                 }
 475
 476                 if (WIFEXITED(status)) {
 477                         if (WEXITSTATUS(status) != 0)
 478                                 return (WEXITSTATUS(status));
 479                 } else if (WIFSIGNALED(status)) {
 480                         warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
 481                         return (1);
 482                 }
 483
 484                 if (verbose) {
 485                         if (statfs(name, &sf) < 0) {
 486                                 warn("statfs %s", name);
 487                                 return (1);
 488                         }
 489                         if (fstab_style)
 490                                 putfsent(&sf);
 491                         else
 492                                 prmount(&sf);
 493                 }
 494                 break;
 495         }
 496
 497         return (0);
 498 }
 499
 500 static void
 501 prmount(struct statfs *sfp)
 502 {
 503         struct passwd *pw;
 504         char *buf;
 505         int error;
 506         int len;
 507
 508         error = 0;
 509         len = 256;
 510
 511         if ((buf = malloc(len)) == NULL)
 512                 errx(1, "malloc failed");
 513
 514         printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
 515             sfp->f_fstypename);
 516
 517         /* Get a string buffer with all the used flags names */
 518         error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS,
 519                          -1, NULL, 0, buf, len);
 520
 521         if (sfp->f_owner) {
 522                 printf(", mounted by ");
 523                 if ((pw = getpwuid(sfp->f_owner)) != NULL)
 524                         printf("%s", pw->pw_name);
 525                 else
 526                         printf("%d", sfp->f_owner);
 527         }
 528
 529         if (error != -1 && strlen(buf))
 530                 printf(", %s", buf);
 531
 532         if (verbose) {
 533                 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
 534                         printf(", writes: sync %ld async %ld",
 535                             sfp->f_syncwrites, sfp->f_asyncwrites);
 536                 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
 537                         printf(", reads: sync %ld async %ld",
 538                             sfp->f_syncreads, sfp->f_asyncreads);
 539         }
 540         printf(")\n");
 541 }
 542
 543 static struct statfs *
 544 getmntpt(const char *name)
 545 {
 546         struct statfs *mntbuf;
 547         int i, mntsize;
 548
 549         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 550         for (i = mntsize - 1; i >= 0; i--) {
 551                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
 552                     strcmp(mntbuf[i].f_mntonname, name) == 0)
 553                         return (&mntbuf[i]);
 554         }
 555         return (NULL);
 556 }
 557
 558 static char *
 559 catopt(char *s0, const char *s1)
 560 {
 561         size_t i;
 562         char *cp;
 563
 564         if (s1 == NULL || *s1 == '\0')
 565                 return s0;
 566
 567         if (s0 && *s0) {
 568                 i = strlen(s0) + strlen(s1) + 1 + 1;
 569                 if ((cp = malloc(i)) == NULL)
 570                         errx(1, "malloc failed");
 571                 snprintf(cp, i, "%s,%s", s0, s1);
 572         } else
 573                 cp = xstrdup(s1);
 574
 575         if (s0)
 576                 free(s0);
 577         return (cp);
 578 }
 579
 580 static void
 581 mangle(char *options, int *argcp, const char **argv)
 582 {
 583         char *p, *s;
 584         int argc;
 585
 586         argc = *argcp;
 587         for (s = options; (p = strsep(&s, ",")) != NULL;)
 588                 if (*p != '\0') {
 589                         if (*p == '-') {
 590                                 argv[argc++] = p;
 591                                 p = strchr(p, '=');
 592                                 if (p) {
 593                                         *p = '\0';
 594                                         argv[argc++] = p+1;
 595                                 }
 596                         } else if (strcmp(p, "rw") != 0) {
 597                                 argv[argc++] = "-o";
 598                                 argv[argc++] = p;
 599                         }
 600                 }
 601
 602         *argcp = argc;
 603 }
 604
 605
 606 static char *
 607 update_options(char *opts, char *fstab, int curflags)
 608 {
 609         char *o, *p;
 610         char *cur;
 611         char *expopt, *newopt, *tmpopt;
 612
 613         if (opts == NULL)
 614                 return xstrdup("");
 615
 616         /* remove meta options from list */
 617         remopt(fstab, MOUNT_META_OPTION_FSTAB);
 618         remopt(fstab, MOUNT_META_OPTION_CURRENT);
 619         cur = flags2opts(curflags);
 620
 621         /*
 622          * Expand all meta-options passed to us first.
 623          */
 624         expopt = NULL;
 625         for (p = opts; (o = strsep(&p, ",")) != NULL;) {
 626                 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
 627                         expopt = catopt(expopt, fstab);
 628                 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
 629                         expopt = catopt(expopt, cur);
 630                 else
 631                         expopt = catopt(expopt, o);
 632         }
 633         free(cur);
 634         free(opts);
 635
 636         /*
 637          * Remove previous contradictory arguments. Given option "foo" we
 638          * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
 639          * and "foo" - so we can deal with possible options like "notice".
 640          */
 641         newopt = NULL;
 642         for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
 643                 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
 644                         errx(1, "malloc failed");
 645
 646                 strcpy(tmpopt, "no");
 647                 strcat(tmpopt, o);
 648                 remopt(newopt, tmpopt);
 649                 free(tmpopt);
 650
 651                 if (strncmp("no", o, 2) == 0)
 652                         remopt(newopt, o+2);
 653
 654                 newopt = catopt(newopt, o);
 655         }
 656         free(expopt);
 657
 658         return newopt;
 659 }
 660
 661 static void
 662 remopt(char *string, const char *opt)
 663 {
 664         char *o, *p, *r;
 665
 666         if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
 667                 return;
 668
 669         r = string;
 670
 671         for (p = string; (o = strsep(&p, ",")) != NULL;) {
 672                 if (strcmp(opt, o) != 0) {
 673                         if (*r == ',' && *o != '\0')
 674                                 r++;
 675                         while ((*r++ = *o++) != '\0')
 676                             ;
 677                         *--r = ',';
 678                 }
 679         }
 680         *r = '\0';
 681 }
 682
 683 static void
 684 usage(void)
 685 {
 686
 687         fprintf(stderr, "%s\n%s\n%s\n",
 688 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t type]",
 689 "       mount [-dfpruvw] {special | node}",
 690 "       mount [-dfpruvw] [-o options] [-t type] special node");
 691         exit(1);
 692 }
 693
 694 /*
 695  * Prints the default values for dump frequency and pass number of fsck.
 696  * This happens when mount(8) is called with -p and there is no fstab file
 697  * or there is but the values aren't specified.
 698  */
 699 static void
 700 printdefvals(const struct statfs *ent)
 701 {
 702         if (strcmp(ent->f_fstypename, "ufs") == 0) {
 703                 if (strcmp(ent->f_mntonname, "/") == 0)
 704                         printf("\t1 1\n");
 705                 else
 706                         printf("\t2 2\n");
 707         } else {
 708                 printf("\t0 0\n");
 709         }
 710 }
 711
 712 static void
 713 putfsent(const struct statfs *ent)
 714 {
 715         struct stat sb;
 716         struct fstab *fst;
 717         char *opts;
 718
 719         opts = flags2opts(ent->f_flags);
 720         printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
 721             ent->f_fstypename, opts);
 722         free(opts);
 723
 724         /*
 725          * If fstab file is missing don't call getfsspec() or getfsfile()
 726          * at all, because the same warning will be printed twice for every
 727          * mounted filesystem.
 728          */
 729         if (stat(_PATH_FSTAB, &sb) != -1) {
 730                 if ((fst = getfsspec(ent->f_mntfromname)))
 731                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 732                 else if ((fst = getfsfile(ent->f_mntonname)))
 733                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 734                 else
 735                         printdefvals(ent);
 736         } else {
 737                 printdefvals(ent);
 738         }
 739 }
 740
 741
 742 static char *
 743 flags2opts(int flags)
 744 {
 745         char *res;
 746
 747         res = NULL;
 748
 749         res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
 750
 751         if (flags & MNT_SYNCHRONOUS)    res = catopt(res, "sync");
 752         if (flags & MNT_NOEXEC)         res = catopt(res, "noexec");
 753         if (flags & MNT_NOSUID)         res = catopt(res, "nosuid");
 754         if (flags & MNT_NODEV)          res = catopt(res, "nodev");
 755         if (flags & MNT_ASYNC)          res = catopt(res, "async");
 756         if (flags & MNT_NOATIME)        res = catopt(res, "noatime");
 757         if (flags & MNT_NOCLUSTERR)     res = catopt(res, "noclusterr");
 758         if (flags & MNT_NOCLUSTERW)     res = catopt(res, "noclusterw");
 759         if (flags & MNT_NOSYMFOLLOW)    res = catopt(res, "nosymfollow");
 760         if (flags & MNT_SUIDDIR)        res = catopt(res, "suiddir");
 761         if (flags & MNT_IGNORE)         res = catopt(res, "ignore");
 762
 763         return res;
 764 }
 765
 766 static char*
 767 xstrdup(const char *str)
 768 {
 769         char* ret = strdup(str);
 770         if(ret == NULL) {
 771                 errx(1, "strdup failed (could not allocate memory)");
 772         }
 773         return ret;
 774 }
 775
 776 /*
 777  * Hack 'cd9660' for the default fstype on cd media if no disklabel
 778  * found.
 779  */
 780 static int
 781 iscdmedia(const char *path, int fd __unused)
 782 {
 783         int n;
 784
 785         if (strrchr(path, '/'))
 786                 path = strrchr(path, '/') + 1;
 787         if (sscanf(path, "acd%d", &n) == 1)
 788                 return 1;
 789         if (sscanf(path, "cd%d", &n) == 1)
 790                 return 1;
 791         return 0;
 792 }
 793
 794 /*
 795  * If the device path is a cdev attempt to access the disklabel to determine
 796  * the filesystem type.  Adjust *vfstypep if we can figure it out
 797  * definitively.
 798  *
 799  * Ignore any portion of the device path after an '@' or ':'.
 800  */
 801 static void
 802 checkdisklabel(const char *devpath, const char **vfstypep)
 803 {
 804         struct stat st;
 805         struct partinfo info;
 806         char *path = strdup(devpath);
 807         int fd;
 808
 809         if (strchr(path, '@'))
 810                 *strchr(path, '@') = 0;
 811         if (strchr(path, ':'))
 812                 *strchr(path, ':') = 0;
 813
 814         if (stat(path, &st) < 0)
 815                 goto done;
 816         if (!S_ISCHR(st.st_mode))
 817                 goto done;
 818         fd = open(path, O_RDONLY);
 819         if (fd < 0)
 820                 goto done;
 821         if (ioctl(fd, DIOCGPART, &info) == 0) {
 822                 if (info.fstype >= 0 && info.fstype < (int)FSMAXTYPES) {
 823                         if (fstype_to_vfsname[info.fstype]) {
 824                                 *vfstypep = fstype_to_vfsname[info.fstype];
 825                         } else if (iscdmedia(path, fd)) {
 826                                 *vfstypep = "cd9660";
 827                         } else {
 828                                 fprintf(stderr,
 829                                         "mount: warning: fstype in disklabel "
 830                                         "not set to anything I understand\n");
 831                                 fprintf(stderr,
 832                                         "attempting to mount with -t ufs\n");
 833                         }
 834                 }
 835         }
 836         close(fd);
 837 done:
 838         free(path);
 839 }