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
 111         /*
 112          * We have mountd(8) PID in mountdpid varible, let's signal it.
 113          * Silently ignore any error.  mountd might not be signalable for
 114          * various reasons (jail, different reaper, bad /var/run/mountd.pid
 115          * file, etc)
 116          */
 117         kill(mountdpid, SIGUSR1);
 118 }
 119
 120 int
 121 main(int argc, char **argv)
 122 {
 123         const char *mntfromname, **vfslist, *vfstype;
 124         struct fstab *fs;
 125         struct statfs *mntbuf;
 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, "adF:fo: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                         setfstab(optarg);
 143                         break;
 144                 case 'f':
 145                         init_flags |= MNT_FORCE;
 146                         break;
 147                 case 'o':
 148                         if (*optarg)
 149                                 options = catopt(options, optarg);
 150                         break;
 151                 case 'p':
 152                         fstab_style = 1;
 153                         verbose = 1;
 154                         break;
 155                 case 'r':
 156                         options = catopt(options, "ro");
 157                         break;
 158                 case 't':
 159                         if (vfslist != NULL)
 160                                 errx(1, "only one -t option may be specified");
 161                         vfslist = makevfslist(optarg);
 162                         vfstype = optarg;
 163                         break;
 164                 case 'u':
 165                         init_flags |= MNT_UPDATE;
 166                         break;
 167                 case 'v':
 168                         verbose = 1;
 169                         break;
 170                 case 'w':
 171                         options = catopt(options, "noro");
 172                         break;
 173                 case '?':
 174                 default:
 175                         usage();
 176                         /* NOTREACHED */
 177                 }
 178         }
 179         argc -= optind;
 180         argv += optind;
 181
 182 #define BADTYPE(type)                                                   \
 183         (strcmp(type, FSTAB_RO) &&                                      \
 184             strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
 185
 186         rval = 0;
 187         switch (argc) {
 188         case 0:
 189                 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
 190                         err(1, "getmntinfo");
 191                 if (all) {
 192                         while ((fs = getfsent()) != NULL) {
 193                                 if (BADTYPE(fs->fs_type))
 194                                         continue;
 195                                 if (checkvfsname(fs->fs_vfstype, vfslist))
 196                                         continue;
 197                                 if (hasopt(fs->fs_mntops, "noauto"))
 198                                         continue;
 199                                 if (!(init_flags & MNT_UPDATE) &&
 200                                     ismounted(fs, mntbuf, mntsize))
 201                                         continue;
 202                                 options = update_options(options,
 203                                     fs->fs_mntops, mntbuf->f_flags);
 204                                 if (mountfs(fs->fs_vfstype, fs->fs_spec,
 205                                     fs->fs_file, init_flags, options,
 206                                     fs->fs_mntops))
 207                                         rval = 1;
 208                         }
 209                 } else if (fstab_style) {
 210                         for (i = 0; i < mntsize; i++) {
 211                                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 212                                         continue;
 213                                 putfsent(&mntbuf[i]);
 214                         }
 215                 } else {
 216                         for (i = 0; i < mntsize; i++) {
 217                                 if (checkvfsname(mntbuf[i].f_fstypename,
 218                                     vfslist))
 219                                         continue;
 220                                 prmount(&mntbuf[i]);
 221                         }
 222                 }
 223                 exit(rval);
 224         case 1:
 225                 if (vfslist != NULL)
 226                         usage();
 227
 228                 rmslashes(*argv, *argv);
 229
 230                 if (init_flags & MNT_UPDATE) {
 231                         mntfromname = NULL;
 232                         have_fstab = 0;
 233                         if ((mntbuf = getmntpt(*argv)) == NULL)
 234                                 errx(1, "not currently mounted %s", *argv);
 235                         /*
 236                          * Only get the mntflags from fstab if both mntpoint
 237                          * and mntspec are identical. Also handle the special
 238                          * case where just '/' is mounted and 'spec' is not
 239                          * identical with the one from fstab ('/dev' is missing
 240                          * in the spec-string at boot-time).
 241                          */
 242                         if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
 243                                 if (strcmp(fs->fs_spec,
 244                                     mntbuf->f_mntfromname) == 0 &&
 245                                     strcmp(fs->fs_file,
 246                                     mntbuf->f_mntonname) == 0) {
 247                                         have_fstab = 1;
 248                                         mntfromname = mntbuf->f_mntfromname;
 249                                 } else if (argv[0][0] == '/' &&
 250                                     argv[0][1] == '\0') {
 251                                         fs = getfsfile("/");
 252                                         have_fstab = 1;
 253                                         mntfromname = fs->fs_spec;
 254                                 }
 255                         }
 256                         if (have_fstab) {
 257                                 options = update_options(options, fs->fs_mntops,
 258                                     mntbuf->f_flags);
 259                         } else {
 260                                 mntfromname = mntbuf->f_mntfromname;
 261                                 options = update_options(options, NULL,
 262                                     mntbuf->f_flags);
 263                         }
 264                         rval = mountfs(mntbuf->f_fstypename, mntfromname,
 265                             mntbuf->f_mntonname, init_flags, options, 0);
 266                         break;
 267                 }
 268                 if ((fs = getfsfile(*argv)) == NULL &&
 269                     (fs = getfsspec(*argv)) == NULL)
 270                         errx(1, "%s: unknown special file or file system",
 271                             *argv);
 272                 if (BADTYPE(fs->fs_type))
 273                         errx(1, "%s has unknown file system type",
 274                             *argv);
 275                 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
 276                     init_flags, options, fs->fs_mntops);
 277                 break;
 278         case 2:
 279                 /*
 280                  * If -t flag has not been specified, the path cannot be
 281                  * found.
 282                  *
 283                  * If the spec is not a file and contains a ':' then assume
 284                  * NFS.
 285                  *
 286                  * If the spec is not a file and contains a '@' then assume
 287                  * HAMMER2.  Note that there may not be a raw device
 288                  * specified in this situation.
 289                  *
 290                  * If the spec is a cdev attempt to extract the fstype from
 291                  * the label.
 292                  *
 293                  * When all else fails ufs is assumed.
 294                  */
 295                 if (vfslist == NULL) {
 296                         if (strpbrk(argv[0], ":") != NULL &&
 297                             access(argv[0], 0) == -1) {
 298                                 vfstype = "nfs";
 299                         } else if (strpbrk(argv[0], "@") != NULL &&
 300                                    access(argv[0], 0) == -1) {
 301                                 vfstype = "hammer2";
 302                         } else {
 303                                 checkdisklabel(argv[0], &vfstype);
 304                         }
 305                 }
 306
 307                 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
 308                                init_flags, options, NULL);
 309                 break;
 310         default:
 311                 usage();
 312                 /* NOTREACHED */
 313         }
 314
 315         /*
 316          * If the mount was successfully, and done by root, tell mountd the
 317          * good news.
 318          */
 319         if (rval == 0 && getuid() == 0)
 320                 restart_mountd();
 321
 322         exit(rval);
 323 }
 324
 325 static int
 326 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
 327 {
 328         int i;
 329
 330         if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
 331                 /* the root file system can always be remounted */
 332                 return (0);
 333
 334         for (i = mntsize - 1; i >= 0; --i)
 335                 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
 336                     (!isremountable(fs->fs_vfstype) ||
 337                      strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
 338                         return (1);
 339         return (0);
 340 }
 341
 342 static int
 343 isremountable(const char *vfsname)
 344 {
 345         const char **cp;
 346
 347         for (cp = remountable_fs_names; *cp; cp++)
 348                 if (strcmp(*cp, vfsname) == 0)
 349                         return (1);
 350         return (0);
 351 }
 352
 353 static int
 354 hasopt(const char *mntopts, const char *option)
 355 {
 356         int negative, found;
 357         char *opt, *optbuf;
 358
 359         if (option[0] == 'n' && option[1] == 'o') {
 360                 negative = 1;
 361                 option += 2;
 362         } else
 363                 negative = 0;
 364         optbuf = xstrdup(mntopts);
 365         found = 0;
 366         for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
 367                 if (opt[0] == 'n' && opt[1] == 'o') {
 368                         if (!strcasecmp(opt + 2, option))
 369                                 found = negative;
 370                 } else if (!strcasecmp(opt, option))
 371                         found = !negative;
 372         }
 373         free(optbuf);
 374         return (found);
 375 }
 376
 377 static int
 378 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
 379         const char *options, const char *mntopts)
 380 {
 381         /* List of directories containing mount_xxx subcommands. */
 382         static const char *edirs[] = {
 383                 _PATH_SBIN,
 384                 _PATH_USRSBIN,
 385                 NULL
 386         };
 387         const char *argv[100], **edir;
 388         struct statfs sf;
 389         pid_t pid;
 390         int argc, i, status;
 391         char *optbuf;
 392         char *argv0;
 393         char execname[MAXPATHLEN + 1];
 394         char mntpath[MAXPATHLEN];
 395
 396         /* resolve the mountpoint with realpath(3) */
 397         checkpath(name, mntpath);
 398         name = mntpath;
 399
 400         if (mntopts == NULL)
 401                 mntopts = "";
 402         if (options == NULL) {
 403                 if (*mntopts == '\0') {
 404                         options = "rw";
 405                 } else {
 406                         options = mntopts;
 407                         mntopts = "";
 408                 }
 409         }
 410         optbuf = catopt(xstrdup(mntopts), options);
 411
 412         if (strcmp(name, "/") == 0)
 413                 flags |= MNT_UPDATE;
 414         if (flags & MNT_FORCE)
 415                 optbuf = catopt(optbuf, "force");
 416         if (flags & MNT_RDONLY)
 417                 optbuf = catopt(optbuf, "ro");
 418         /*
 419          * XXX
 420          * The mount_mfs (newfs) command uses -o to select the
 421          * optimization mode.  We don't pass the default "-o rw"
 422          * for that reason.
 423          */
 424         if (flags & MNT_UPDATE)
 425                 optbuf = catopt(optbuf, "update");
 426
 427         asprintf(&argv0, "mount_%s", vfstype);
 428
 429         argc = 0;
 430         argv[argc++] = argv0;
 431         mangle(optbuf, &argc, argv);
 432         argv[argc++] = spec;
 433         argv[argc++] = name;
 434         argv[argc] = NULL;
 435
 436         if (debug) {
 437                 printf("exec: mount_%s", vfstype);
 438                 for (i = 1; i < argc; i++)
 439                         printf(" %s", argv[i]);
 440                 printf("\n");
 441                 return (0);
 442         }
 443
 444         switch (pid = fork()) {
 445         case -1:                                /* Error. */
 446                 warn("fork");
 447                 free(optbuf);
 448                 return (1);
 449         case 0:                                 /* Child. */
 450                 /* Go find an executable. */
 451                 for (edir = edirs; *edir; edir++) {
 452                         snprintf(execname, sizeof(execname),
 453                                  "%s/mount_%s", *edir, vfstype);
 454                         execv(execname, __DECONST(char * const *, argv));
 455                 }
 456                 if (errno == ENOENT) {
 457                         int len = 0;
 458                         char *cp;
 459                         for (edir = edirs; *edir; edir++)
 460                                 len += strlen(*edir) + 2;       /* ", " */
 461                         if ((cp = malloc(len)) == NULL)
 462                                 errx(1, "malloc failed");
 463                         cp[0] = '\0';
 464                         for (edir = edirs; *edir; edir++) {
 465                                 strcat(cp, *edir);
 466                                 if (edir[1] != NULL)
 467                                         strcat(cp, ", ");
 468                         }
 469                         warn("exec mount_%s not found in %s", vfstype, cp);
 470                 }
 471                 exit(1);
 472                 /* NOTREACHED */
 473         default:                                /* Parent. */
 474                 free(optbuf);
 475
 476                 if (waitpid(pid, &status, 0) < 0) {
 477                         warn("waitpid");
 478                         return (1);
 479                 }
 480
 481                 if (WIFEXITED(status)) {
 482                         if (WEXITSTATUS(status) != 0)
 483                                 return (WEXITSTATUS(status));
 484                 } else if (WIFSIGNALED(status)) {
 485                         warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
 486                         return (1);
 487                 }
 488
 489                 if (verbose) {
 490                         if (statfs(name, &sf) < 0) {
 491                                 warn("statfs %s", name);
 492                                 return (1);
 493                         }
 494                         if (fstab_style)
 495                                 putfsent(&sf);
 496                         else
 497                                 prmount(&sf);
 498                 }
 499                 break;
 500         }
 501
 502         return (0);
 503 }
 504
 505 static void
 506 prmount(struct statfs *sfp)
 507 {
 508         struct passwd *pw;
 509         char *buf;
 510         int error;
 511         int len;
 512
 513         error = 0;
 514         len = 256;
 515
 516         if ((buf = malloc(len)) == NULL)
 517                 errx(1, "malloc failed");
 518
 519         printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
 520             sfp->f_fstypename);
 521
 522         /* Get a string buffer with all the used flags names */
 523         error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS,
 524                          -1, NULL, 0, buf, len);
 525
 526         if (sfp->f_owner) {
 527                 printf(", mounted by ");
 528                 if ((pw = getpwuid(sfp->f_owner)) != NULL)
 529                         printf("%s", pw->pw_name);
 530                 else
 531                         printf("%d", sfp->f_owner);
 532         }
 533
 534         if (error != -1 && strlen(buf))
 535                 printf(", %s", buf);
 536
 537         if (verbose) {
 538                 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
 539                         printf(", writes: sync %ld async %ld",
 540                             sfp->f_syncwrites, sfp->f_asyncwrites);
 541                 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
 542                         printf(", reads: sync %ld async %ld",
 543                             sfp->f_syncreads, sfp->f_asyncreads);
 544         }
 545         printf(")\n");
 546 }
 547
 548 static struct statfs *
 549 getmntpt(const char *name)
 550 {
 551         struct statfs *mntbuf;
 552         int i, mntsize;
 553
 554         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 555         for (i = mntsize - 1; i >= 0; i--) {
 556                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
 557                     strcmp(mntbuf[i].f_mntonname, name) == 0)
 558                         return (&mntbuf[i]);
 559         }
 560         return (NULL);
 561 }
 562
 563 static char *
 564 catopt(char *s0, const char *s1)
 565 {
 566         size_t i;
 567         char *cp;
 568
 569         if (s1 == NULL || *s1 == '\0')
 570                 return s0;
 571
 572         if (s0 && *s0) {
 573                 i = strlen(s0) + strlen(s1) + 1 + 1;
 574                 if ((cp = malloc(i)) == NULL)
 575                         errx(1, "malloc failed");
 576                 snprintf(cp, i, "%s,%s", s0, s1);
 577         } else
 578                 cp = xstrdup(s1);
 579
 580         if (s0)
 581                 free(s0);
 582         return (cp);
 583 }
 584
 585 static void
 586 mangle(char *options, int *argcp, const char **argv)
 587 {
 588         char *p, *s;
 589         int argc;
 590
 591         argc = *argcp;
 592         for (s = options; (p = strsep(&s, ",")) != NULL;)
 593                 if (*p != '\0') {
 594                         if (*p == '-') {
 595                                 argv[argc++] = p;
 596                                 p = strchr(p, '=');
 597                                 if (p) {
 598                                         *p = '\0';
 599                                         argv[argc++] = p+1;
 600                                 }
 601                         } else if (strcmp(p, "rw") != 0) {
 602                                 argv[argc++] = "-o";
 603                                 argv[argc++] = p;
 604                         }
 605                 }
 606
 607         *argcp = argc;
 608 }
 609
 610
 611 static char *
 612 update_options(char *opts, char *fstab, int curflags)
 613 {
 614         char *o, *p;
 615         char *cur;
 616         char *expopt, *newopt, *tmpopt;
 617
 618         if (opts == NULL)
 619                 return xstrdup("");
 620
 621         /* remove meta options from list */
 622         remopt(fstab, MOUNT_META_OPTION_FSTAB);
 623         remopt(fstab, MOUNT_META_OPTION_CURRENT);
 624         cur = flags2opts(curflags);
 625
 626         /*
 627          * Expand all meta-options passed to us first.
 628          */
 629         expopt = NULL;
 630         for (p = opts; (o = strsep(&p, ",")) != NULL;) {
 631                 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
 632                         expopt = catopt(expopt, fstab);
 633                 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
 634                         expopt = catopt(expopt, cur);
 635                 else
 636                         expopt = catopt(expopt, o);
 637         }
 638         free(cur);
 639         free(opts);
 640
 641         /*
 642          * Remove previous contradictory arguments. Given option "foo" we
 643          * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
 644          * and "foo" - so we can deal with possible options like "notice".
 645          */
 646         newopt = NULL;
 647         for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
 648                 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
 649                         errx(1, "malloc failed");
 650
 651                 strcpy(tmpopt, "no");
 652                 strcat(tmpopt, o);
 653                 remopt(newopt, tmpopt);
 654                 free(tmpopt);
 655
 656                 if (strncmp("no", o, 2) == 0)
 657                         remopt(newopt, o+2);
 658
 659                 newopt = catopt(newopt, o);
 660         }
 661         free(expopt);
 662
 663         return newopt;
 664 }
 665
 666 static void
 667 remopt(char *string, const char *opt)
 668 {
 669         char *o, *p, *r;
 670
 671         if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
 672                 return;
 673
 674         r = string;
 675
 676         for (p = string; (o = strsep(&p, ",")) != NULL;) {
 677                 if (strcmp(opt, o) != 0) {
 678                         if (*r == ',' && *o != '\0')
 679                                 r++;
 680                         while ((*r++ = *o++) != '\0')
 681                             ;
 682                         *--r = ',';
 683                 }
 684         }
 685         *r = '\0';
 686 }
 687
 688 static void
 689 usage(void)
 690 {
 691
 692         fprintf(stderr, "%s\n%s\n%s\n",
 693 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t type]",
 694 "       mount [-dfpruvw] {special | node}",
 695 "       mount [-dfpruvw] [-o options] [-t type] special node");
 696         exit(1);
 697 }
 698
 699 /*
 700  * Prints the default values for dump frequency and pass number of fsck.
 701  * This happens when mount(8) is called with -p and there is no fstab file
 702  * or there is but the values aren't specified.
 703  */
 704 static void
 705 printdefvals(const struct statfs *ent)
 706 {
 707         if (strcmp(ent->f_fstypename, "ufs") == 0) {
 708                 if (strcmp(ent->f_mntonname, "/") == 0)
 709                         printf("\t1 1\n");
 710                 else
 711                         printf("\t2 2\n");
 712         } else {
 713                 printf("\t0 0\n");
 714         }
 715 }
 716
 717 static void
 718 putfsent(const struct statfs *ent)
 719 {
 720         struct stat sb;
 721         struct fstab *fst;
 722         char *opts;
 723
 724         opts = flags2opts(ent->f_flags);
 725         printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
 726             ent->f_fstypename, opts);
 727         free(opts);
 728
 729         /*
 730          * If fstab file is missing don't call getfsspec() or getfsfile()
 731          * at all, because the same warning will be printed twice for every
 732          * mounted filesystem.
 733          */
 734         if (stat(_PATH_FSTAB, &sb) != -1) {
 735                 if ((fst = getfsspec(ent->f_mntfromname)))
 736                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 737                 else if ((fst = getfsfile(ent->f_mntonname)))
 738                         printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
 739                 else
 740                         printdefvals(ent);
 741         } else {
 742                 printdefvals(ent);
 743         }
 744 }
 745
 746
 747 static char *
 748 flags2opts(int flags)
 749 {
 750         char *res;
 751
 752         res = NULL;
 753
 754         res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
 755
 756         if (flags & MNT_SYNCHRONOUS)    res = catopt(res, "sync");
 757         if (flags & MNT_NOEXEC)         res = catopt(res, "noexec");
 758         if (flags & MNT_NOSUID)         res = catopt(res, "nosuid");
 759         if (flags & MNT_NODEV)          res = catopt(res, "nodev");
 760         if (flags & MNT_ASYNC)          res = catopt(res, "async");
 761         if (flags & MNT_NOATIME)        res = catopt(res, "noatime");
 762         if (flags & MNT_NOCLUSTERR)     res = catopt(res, "noclusterr");
 763         if (flags & MNT_NOCLUSTERW)     res = catopt(res, "noclusterw");
 764         if (flags & MNT_NOSYMFOLLOW)    res = catopt(res, "nosymfollow");
 765         if (flags & MNT_SUIDDIR)        res = catopt(res, "suiddir");
 766         if (flags & MNT_IGNORE)         res = catopt(res, "ignore");
 767
 768         return res;
 769 }
 770
 771 static char*
 772 xstrdup(const char *str)
 773 {
 774         char* ret = strdup(str);
 775         if(ret == NULL) {
 776                 errx(1, "strdup failed (could not allocate memory)");
 777         }
 778         return ret;
 779 }
 780
 781 /*
 782  * Hack 'cd9660' for the default fstype on cd media if no disklabel
 783  * found.
 784  */
 785 static int
 786 iscdmedia(const char *path, int fd __unused)
 787 {
 788         int n;
 789
 790         if (strrchr(path, '/'))
 791                 path = strrchr(path, '/') + 1;
 792         if (sscanf(path, "acd%d", &n) == 1)
 793                 return 1;
 794         if (sscanf(path, "cd%d", &n) == 1)
 795                 return 1;
 796         return 0;
 797 }
 798
 799 /*
 800  * If the device path is a cdev attempt to access the disklabel to determine
 801  * the filesystem type.  Adjust *vfstypep if we can figure it out
 802  * definitively.
 803  *
 804  * Ignore any portion of the device path after an '@' or ':'.
 805  */
 806 static void
 807 checkdisklabel(const char *devpath, const char **vfstypep)
 808 {
 809         struct stat st;
 810         struct partinfo info;
 811         char *path = strdup(devpath);
 812         int fd;
 813
 814         if (strchr(path, '@'))
 815                 *strchr(path, '@') = 0;
 816         if (strchr(path, ':'))
 817                 *strchr(path, ':') = 0;
 818
 819         if (stat(path, &st) < 0)
 820                 goto done;
 821         if (!S_ISCHR(st.st_mode))
 822                 goto done;
 823         fd = open(path, O_RDONLY);
 824         if (fd < 0)
 825                 goto done;
 826         if (ioctl(fd, DIOCGPART, &info) == 0) {
 827                 if (info.fstype >= 0 && info.fstype < (int)FSMAXTYPES) {
 828                         if (fstype_to_vfsname[info.fstype]) {
 829                                 *vfstypep = fstype_to_vfsname[info.fstype];
 830                         } else if (iscdmedia(path, fd)) {
 831                                 *vfstypep = "cd9660";
 832                         } else {
 833                                 fprintf(stderr,
 834                                         "mount: warning: fstype in disklabel "
 835                                         "not set to anything I understand\n");
 836                                 fprintf(stderr,
 837                                         "attempting to mount with -t ufs\n");
 838                         }
 839                 }
 840         }
 841         close(fd);
 842 done:
 843         free(path);
 844 }