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