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 1.8 2004/12/18 21:43:39 swildner 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 char *catopt(char *, const char *); 65 struct statfs 66 *getmntpt(const char *); 67 int hasopt(const char *, const char *); 68 int ismounted(struct fstab *, struct statfs *, int); 69 int isremountable(const char *); 70 void mangle(char *, int *, const char **); 71 char *update_options(char *, char *, int); 72 int mountfs(const char *, const char *, const char *, 73 int, const char *, const char *); 74 void remopt(char *, const char *); 75 void prmount(struct statfs *); 76 void putfsent(const struct statfs *); 77 void usage(void); 78 char *flags2opts(int); 79 80 /* Map from mount options to printable formats. */ 81 static struct opt { 82 int o_opt; 83 const char *o_name; 84 } optnames[] = { 85 { MNT_ASYNC, "asynchronous" }, 86 { MNT_EXPORTED, "NFS exported" }, 87 { MNT_LOCAL, "local" }, 88 { MNT_NOATIME, "noatime" }, 89 { MNT_NODEV, "nodev" }, 90 { MNT_NOEXEC, "noexec" }, 91 { MNT_NOSUID, "nosuid" }, 92 { MNT_NOSYMFOLLOW, "nosymfollow" }, 93 { MNT_QUOTA, "with quotas" }, 94 { MNT_RDONLY, "read-only" }, 95 { MNT_SYNCHRONOUS, "synchronous" }, 96 { MNT_UNION, "union" }, 97 { MNT_NOCLUSTERR, "noclusterr" }, 98 { MNT_NOCLUSTERW, "noclusterw" }, 99 { MNT_SUIDDIR, "suiddir" }, 100 { MNT_SOFTDEP, "soft-updates" }, 101 { 0, NULL } 102 }; 103 104 /* 105 * List of VFS types that can be remounted without becoming mounted on top 106 * of each other. 107 * XXX Is this list correct? 108 */ 109 static const char * 110 remountable_fs_names[] = { 111 "ufs", "ffs", "ext2fs", 112 0 113 }; 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 FILE *mountdfp; 122 pid_t pid; 123 int all, ch, i, init_flags, mntsize, rval, have_fstab; 124 char *options; 125 126 all = init_flags = 0; 127 options = NULL; 128 vfslist = NULL; 129 vfstype = "ufs"; 130 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1) 131 switch (ch) { 132 case 'a': 133 all = 1; 134 break; 135 case 'd': 136 debug = 1; 137 break; 138 case 'f': 139 init_flags |= MNT_FORCE; 140 break; 141 case 'o': 142 if (*optarg) 143 options = catopt(options, optarg); 144 break; 145 case 'p': 146 fstab_style = 1; 147 verbose = 1; 148 break; 149 case 'r': 150 options = catopt(options, "ro"); 151 break; 152 case 't': 153 if (vfslist != NULL) 154 errx(1, "only one -t option may be specified"); 155 vfslist = makevfslist(optarg); 156 vfstype = optarg; 157 break; 158 case 'u': 159 init_flags |= MNT_UPDATE; 160 break; 161 case 'v': 162 verbose = 1; 163 break; 164 case 'w': 165 options = catopt(options, "noro"); 166 break; 167 case '?': 168 default: 169 usage(); 170 /* NOTREACHED */ 171 } 172 argc -= optind; 173 argv += optind; 174 175 #define BADTYPE(type) \ 176 (strcmp(type, FSTAB_RO) && \ 177 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 178 179 rval = 0; 180 switch (argc) { 181 case 0: 182 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 183 err(1, "getmntinfo"); 184 if (all) { 185 while ((fs = getfsent()) != NULL) { 186 if (BADTYPE(fs->fs_type)) 187 continue; 188 if (checkvfsname(fs->fs_vfstype, vfslist)) 189 continue; 190 if (hasopt(fs->fs_mntops, "noauto")) 191 continue; 192 if (!(init_flags & MNT_UPDATE) && 193 ismounted(fs, mntbuf, mntsize)) 194 continue; 195 options = update_options(options, 196 fs->fs_mntops, mntbuf->f_flags); 197 if (mountfs(fs->fs_vfstype, fs->fs_spec, 198 fs->fs_file, init_flags, options, 199 fs->fs_mntops)) 200 rval = 1; 201 } 202 } else if (fstab_style) { 203 for (i = 0; i < mntsize; i++) { 204 if (checkvfsname(mntbuf[i].f_fstypename, vfslist)) 205 continue; 206 putfsent(&mntbuf[i]); 207 } 208 } else { 209 for (i = 0; i < mntsize; i++) { 210 if (checkvfsname(mntbuf[i].f_fstypename, 211 vfslist)) 212 continue; 213 prmount(&mntbuf[i]); 214 } 215 } 216 exit(rval); 217 case 1: 218 if (vfslist != NULL) 219 usage(); 220 221 rmslashes(*argv, *argv); 222 223 if (init_flags & MNT_UPDATE) { 224 mntfromname = NULL; 225 have_fstab = 0; 226 if ((mntbuf = getmntpt(*argv)) == NULL) 227 errx(1, "not currently mounted %s", *argv); 228 /* 229 * Only get the mntflags from fstab if both mntpoint 230 * and mntspec are identical. Also handle the special 231 * case where just '/' is mounted and 'spec' is not 232 * identical with the one from fstab ('/dev' is missing 233 * in the spec-string at boot-time). 234 */ 235 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 236 if (strcmp(fs->fs_spec, 237 mntbuf->f_mntfromname) == 0 && 238 strcmp(fs->fs_file, 239 mntbuf->f_mntonname) == 0) { 240 have_fstab = 1; 241 mntfromname = mntbuf->f_mntfromname; 242 } else if (argv[0][0] == '/' && 243 argv[0][1] == '\0') { 244 fs = getfsfile("/"); 245 have_fstab = 1; 246 mntfromname = fs->fs_spec; 247 } 248 } 249 if (have_fstab) { 250 options = update_options(options, fs->fs_mntops, 251 mntbuf->f_flags); 252 } else { 253 mntfromname = mntbuf->f_mntfromname; 254 options = update_options(options, NULL, 255 mntbuf->f_flags); 256 } 257 rval = mountfs(mntbuf->f_fstypename, mntfromname, 258 mntbuf->f_mntonname, init_flags, options, 0); 259 break; 260 } 261 if ((fs = getfsfile(*argv)) == NULL && 262 (fs = getfsspec(*argv)) == NULL) 263 errx(1, "%s: unknown special file or file system", 264 *argv); 265 if (BADTYPE(fs->fs_type)) 266 errx(1, "%s has unknown file system type", 267 *argv); 268 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, 269 init_flags, options, fs->fs_mntops); 270 break; 271 case 2: 272 /* 273 * If -t flag has not been specified, the path cannot be 274 * found, spec contains either a ':' or a '@', and the 275 * spec is not a file with those characters, then assume 276 * that an NFS filesystem is being specified ala Sun. 277 */ 278 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL && 279 access(argv[0], 0) == -1) 280 vfstype = "nfs"; 281 rval = mountfs(vfstype, 282 argv[0], argv[1], init_flags, options, NULL); 283 break; 284 default: 285 usage(); 286 /* NOTREACHED */ 287 } 288 289 /* 290 * If the mount was successfully, and done by root, tell mountd the 291 * good news. Pid checks are probably unnecessary, but don't hurt. 292 */ 293 if (rval == 0 && getuid() == 0 && 294 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 295 if (fscanf(mountdfp, "%d", &pid) == 1 && 296 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 297 err(1, "signal mountd"); 298 fclose(mountdfp); 299 } 300 301 exit(rval); 302 } 303 304 int 305 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize) 306 { 307 int i; 308 309 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0') 310 /* the root file system can always be remounted */ 311 return (0); 312 313 for (i = mntsize - 1; i >= 0; --i) 314 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 && 315 (!isremountable(fs->fs_vfstype) || 316 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0)) 317 return (1); 318 return (0); 319 } 320 321 int 322 isremountable(const char *vfsname) 323 { 324 const char **cp; 325 326 for (cp = remountable_fs_names; *cp; cp++) 327 if (strcmp(*cp, vfsname) == 0) 328 return (1); 329 return (0); 330 } 331 332 int 333 hasopt(const char *mntopts, const char *option) 334 { 335 int negative, found; 336 char *opt, *optbuf; 337 338 if (option[0] == 'n' && option[1] == 'o') { 339 negative = 1; 340 option += 2; 341 } else 342 negative = 0; 343 optbuf = strdup(mntopts); 344 found = 0; 345 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 346 if (opt[0] == 'n' && opt[1] == 'o') { 347 if (!strcasecmp(opt + 2, option)) 348 found = negative; 349 } else if (!strcasecmp(opt, option)) 350 found = !negative; 351 } 352 free(optbuf); 353 return (found); 354 } 355 356 int 357 mountfs(const char *vfstype, const char *spec, const char *name, int flags, 358 const char *options, const char *mntopts) 359 { 360 /* List of directories containing mount_xxx subcommands. */ 361 static const char *edirs[] = { 362 _PATH_SBIN, 363 _PATH_USRSBIN, 364 NULL 365 }; 366 const char *argv[100], **edir; 367 struct statfs sf; 368 pid_t pid; 369 int argc, i, status; 370 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; 371 372 #if __GNUC__ 373 (void)&optbuf; 374 (void)&name; 375 #endif 376 377 /* resolve the mountpoint with realpath(3) */ 378 checkpath(name, mntpath); 379 name = mntpath; 380 381 if (mntopts == NULL) 382 mntopts = ""; 383 if (options == NULL) { 384 if (*mntopts == '\0') { 385 options = "rw"; 386 } else { 387 options = mntopts; 388 mntopts = ""; 389 } 390 } 391 optbuf = catopt(strdup(mntopts), options); 392 393 if (strcmp(name, "/") == 0) 394 flags |= MNT_UPDATE; 395 if (flags & MNT_FORCE) 396 optbuf = catopt(optbuf, "force"); 397 if (flags & MNT_RDONLY) 398 optbuf = catopt(optbuf, "ro"); 399 /* 400 * XXX 401 * The mount_mfs (newfs) command uses -o to select the 402 * optimization mode. We don't pass the default "-o rw" 403 * for that reason. 404 */ 405 if (flags & MNT_UPDATE) 406 optbuf = catopt(optbuf, "update"); 407 408 argc = 0; 409 argv[argc++] = vfstype; 410 mangle(optbuf, &argc, argv); 411 argv[argc++] = spec; 412 argv[argc++] = name; 413 argv[argc] = NULL; 414 415 if (debug) { 416 printf("exec: mount_%s", vfstype); 417 for (i = 1; i < argc; i++) 418 printf(" %s", argv[i]); 419 printf("\n"); 420 return (0); 421 } 422 423 switch (pid = fork()) { 424 case -1: /* Error. */ 425 warn("fork"); 426 free(optbuf); 427 return (1); 428 case 0: /* Child. */ 429 if (strcmp(vfstype, "ufs") == 0) 430 exit(mount_ufs(argc, (char * const *) argv)); 431 432 /* Go find an executable. */ 433 for (edir = edirs; *edir; edir++) { 434 snprintf(execname, 435 sizeof(execname), "%s/mount_%s", *edir, vfstype); 436 execv(execname, (char * const *)argv); 437 } 438 if (errno == ENOENT) { 439 int len = 0; 440 char *cp; 441 for (edir = edirs; *edir; edir++) 442 len += strlen(*edir) + 2; /* ", " */ 443 if ((cp = malloc(len)) == NULL) 444 errx(1, "malloc failed"); 445 cp[0] = '\0'; 446 for (edir = edirs; *edir; edir++) { 447 strcat(cp, *edir); 448 if (edir[1] != NULL) 449 strcat(cp, ", "); 450 } 451 warn("exec mount_%s not found in %s", vfstype, cp); 452 } 453 exit(1); 454 /* NOTREACHED */ 455 default: /* Parent. */ 456 free(optbuf); 457 458 if (waitpid(pid, &status, 0) < 0) { 459 warn("waitpid"); 460 return (1); 461 } 462 463 if (WIFEXITED(status)) { 464 if (WEXITSTATUS(status) != 0) 465 return (WEXITSTATUS(status)); 466 } else if (WIFSIGNALED(status)) { 467 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]); 468 return (1); 469 } 470 471 if (verbose) { 472 if (statfs(name, &sf) < 0) { 473 warn("statfs %s", name); 474 return (1); 475 } 476 if (fstab_style) 477 putfsent(&sf); 478 else 479 prmount(&sf); 480 } 481 break; 482 } 483 484 return (0); 485 } 486 487 void 488 prmount(struct statfs *sfp) 489 { 490 int flags; 491 struct opt *o; 492 struct passwd *pw; 493 494 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname, 495 sfp->f_fstypename); 496 497 flags = sfp->f_flags & MNT_VISFLAGMASK; 498 for (o = optnames; flags && o->o_opt; o++) 499 if (flags & o->o_opt) { 500 printf(", %s", o->o_name); 501 flags &= ~o->o_opt; 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 if (verbose) { 511 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0) 512 printf(", writes: sync %ld async %ld", 513 sfp->f_syncwrites, sfp->f_asyncwrites); 514 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0) 515 printf(", reads: sync %ld async %ld", 516 sfp->f_syncreads, sfp->f_asyncreads); 517 } 518 printf(")\n"); 519 } 520 521 struct statfs * 522 getmntpt(const char *name) 523 { 524 struct statfs *mntbuf; 525 int i, mntsize; 526 527 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 528 for (i = mntsize - 1; i >= 0; i--) { 529 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 530 strcmp(mntbuf[i].f_mntonname, name) == 0) 531 return (&mntbuf[i]); 532 } 533 return (NULL); 534 } 535 536 char * 537 catopt(char *s0, const char *s1) 538 { 539 size_t i; 540 char *cp; 541 542 if (s1 == NULL || *s1 == '\0') 543 return s0; 544 545 if (s0 && *s0) { 546 i = strlen(s0) + strlen(s1) + 1 + 1; 547 if ((cp = malloc(i)) == NULL) 548 errx(1, "malloc failed"); 549 snprintf(cp, i, "%s,%s", s0, s1); 550 } else 551 cp = strdup(s1); 552 553 if (s0) 554 free(s0); 555 return (cp); 556 } 557 558 void 559 mangle(char *options, int *argcp, const char **argv) 560 { 561 char *p, *s; 562 int argc; 563 564 argc = *argcp; 565 for (s = options; (p = strsep(&s, ",")) != NULL;) 566 if (*p != '\0') { 567 if (*p == '-') { 568 argv[argc++] = p; 569 p = strchr(p, '='); 570 if (p) { 571 *p = '\0'; 572 argv[argc++] = p+1; 573 } 574 } else if (strcmp(p, "rw") != 0) { 575 argv[argc++] = "-o"; 576 argv[argc++] = p; 577 } 578 } 579 580 *argcp = argc; 581 } 582 583 584 char * 585 update_options(char *opts, char *fstab, int curflags) 586 { 587 char *o, *p; 588 char *cur; 589 char *expopt, *newopt, *tmpopt; 590 591 if (opts == NULL) 592 return strdup(""); 593 594 /* remove meta options from list */ 595 remopt(fstab, MOUNT_META_OPTION_FSTAB); 596 remopt(fstab, MOUNT_META_OPTION_CURRENT); 597 cur = flags2opts(curflags); 598 599 /* 600 * Expand all meta-options passed to us first. 601 */ 602 expopt = NULL; 603 for (p = opts; (o = strsep(&p, ",")) != NULL;) { 604 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0) 605 expopt = catopt(expopt, fstab); 606 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0) 607 expopt = catopt(expopt, cur); 608 else 609 expopt = catopt(expopt, o); 610 } 611 free(cur); 612 free(opts); 613 614 /* 615 * Remove previous contradictory arguments. Given option "foo" we 616 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo" 617 * and "foo" - so we can deal with possible options like "notice". 618 */ 619 newopt = NULL; 620 for (p = expopt; (o = strsep(&p, ",")) != NULL;) { 621 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL) 622 errx(1, "malloc failed"); 623 624 strcpy(tmpopt, "no"); 625 strcat(tmpopt, o); 626 remopt(newopt, tmpopt); 627 free(tmpopt); 628 629 if (strncmp("no", o, 2) == 0) 630 remopt(newopt, o+2); 631 632 newopt = catopt(newopt, o); 633 } 634 free(expopt); 635 636 return newopt; 637 } 638 639 void 640 remopt(char *string, const char *opt) 641 { 642 char *o, *p, *r; 643 644 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0') 645 return; 646 647 r = string; 648 649 for (p = string; (o = strsep(&p, ",")) != NULL;) { 650 if (strcmp(opt, o) != 0) { 651 if (*r == ',' && *o != '\0') 652 r++; 653 while ((*r++ = *o++) != '\0') 654 ; 655 *--r = ','; 656 } 657 } 658 *r = '\0'; 659 } 660 661 void 662 usage(void) 663 { 664 665 fprintf(stderr, "%s\n%s\n%s\n", 666 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node", 667 " mount [-adfpruvw] [-o options] [-t ufs | external_type]", 668 " mount [-dfpruvw] special | node"); 669 exit(1); 670 } 671 672 void 673 putfsent(const struct statfs *ent) 674 { 675 struct fstab *fst; 676 char *opts; 677 678 opts = flags2opts(ent->f_flags); 679 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname, 680 ent->f_fstypename, opts); 681 free(opts); 682 683 if ((fst = getfsspec(ent->f_mntfromname))) 684 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 685 else if ((fst = getfsfile(ent->f_mntonname))) 686 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 687 else if (strcmp(ent->f_fstypename, "ufs") == 0) { 688 if (strcmp(ent->f_mntonname, "/") == 0) 689 printf("\t1 1\n"); 690 else 691 printf("\t2 2\n"); 692 } else 693 printf("\t0 0\n"); 694 } 695 696 697 char * 698 flags2opts(int flags) 699 { 700 char *res; 701 702 res = NULL; 703 704 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw"); 705 706 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync"); 707 if (flags & MNT_NOEXEC) res = catopt(res, "noexec"); 708 if (flags & MNT_NOSUID) res = catopt(res, "nosuid"); 709 if (flags & MNT_NODEV) res = catopt(res, "nodev"); 710 if (flags & MNT_UNION) res = catopt(res, "union"); 711 if (flags & MNT_ASYNC) res = catopt(res, "async"); 712 if (flags & MNT_NOATIME) res = catopt(res, "noatime"); 713 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr"); 714 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw"); 715 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow"); 716 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir"); 717 718 return res; 719 } 720