mount.c revision 1.53
1 /* $NetBSD: mount.c,v 1.53 2000/11/01 04:01:45 enami Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95"; 45 #else 46 __RCSID("$NetBSD: mount.c,v 1.53 2000/11/01 04:01:45 enami Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/mount.h> 52 #include <sys/wait.h> 53 54 #include <err.h> 55 #include <errno.h> 56 #include <fstab.h> 57 #include <pwd.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #define MOUNTNAMES 65 #include <fcntl.h> 66 #include <sys/disklabel.h> 67 #include <sys/ioctl.h> 68 69 #include "pathnames.h" 70 71 static int debug, verbose; 72 73 static void catopt __P((char **, const char *)); 74 static const char * 75 getfslab __P((const char *str)); 76 static struct statfs * 77 getmntpt __P((const char *)); 78 static int hasopt __P((const char *, const char *)); 79 static void mangle __P((char *, int *, const char ***, int *)); 80 static int mountfs __P((const char *, const char *, const char *, 81 int, const char *, const char *, int)); 82 static void prmount __P((struct statfs *)); 83 static void usage __P((void)); 84 85 void checkname __P((int, char *[])); 86 int checkvfsname __P((const char *, const char **)); 87 int main __P((int, char *[])); 88 const char ** 89 makevfslist __P((char *)); 90 91 /* Map from mount otions to printable formats. */ 92 static const struct opt { 93 int o_opt; 94 int o_silent; 95 const char *o_name; 96 } optnames[] = { 97 { MNT_ASYNC, 0, "asynchronous" }, 98 { MNT_DEFEXPORTED, 1, "exported to the world" }, 99 { MNT_EXKERB, 1, "kerberos uid mapping" }, 100 { MNT_EXPORTED, 0, "NFS exported" }, 101 { MNT_EXPORTANON, 1, "anon uid mapping" }, 102 { MNT_EXRDONLY, 1, "exported read-only" }, 103 { MNT_LOCAL, 0, "local" }, 104 { MNT_NOATIME, 0, "noatime" }, 105 { MNT_NOCOREDUMP, 0, "nocoredump" }, 106 { MNT_NODEV, 0, "nodev" }, 107 { MNT_NODEVMTIME, 0, "nodevmtime" }, 108 { MNT_NOEXEC, 0, "noexec" }, 109 { MNT_NOSUID, 0, "nosuid" }, 110 { MNT_QUOTA, 0, "with quotas" }, 111 { MNT_RDONLY, 0, "read-only" }, 112 { MNT_ROOTFS, 1, "root file system" }, 113 { MNT_SYMPERM, 0, "symperm" }, 114 { MNT_SYNCHRONOUS, 0, "synchronous" }, 115 { MNT_UNION, 0, "union" }, 116 { MNT_SOFTDEP, 0, "soft dependencies" }, 117 { 0 } 118 }; 119 120 static char ffs_fstype[] = "ffs"; 121 122 int 123 main(argc, argv) 124 int argc; 125 char *argv[]; 126 { 127 const char *mntfromname, *mntonname, **vfslist, *vfstype; 128 struct fstab *fs; 129 struct statfs *mntbuf; 130 FILE *mountdfp; 131 int all, ch, forceall, i, init_flags, mntsize, rval; 132 char *options; 133 const char *mountopts, *fstypename; 134 135 /* if called as specific mount, call it's main mount routine */ 136 checkname(argc, argv); 137 138 /* started as "mount" */ 139 all = forceall = init_flags = 0; 140 options = NULL; 141 vfslist = NULL; 142 vfstype = ffs_fstype; 143 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 144 switch (ch) { 145 case 'A': 146 all = forceall = 1; 147 break; 148 case 'a': 149 all = 1; 150 break; 151 case 'd': 152 debug = 1; 153 break; 154 case 'f': 155 init_flags |= MNT_FORCE; 156 break; 157 case 'o': 158 if (*optarg) 159 catopt(&options, optarg); 160 break; 161 case 'r': 162 init_flags |= MNT_RDONLY; 163 break; 164 case 't': 165 if (vfslist != NULL) 166 errx(1, 167 "only one -t option may be specified."); 168 vfslist = makevfslist(optarg); 169 vfstype = optarg; 170 break; 171 case 'u': 172 init_flags |= MNT_UPDATE; 173 break; 174 case 'v': 175 verbose = 1; 176 break; 177 case 'w': 178 init_flags &= ~MNT_RDONLY; 179 break; 180 case '?': 181 default: 182 usage(); 183 /* NOTREACHED */ 184 } 185 argc -= optind; 186 argv += optind; 187 188 #define BADTYPE(type) \ 189 (strcmp(type, FSTAB_RO) && \ 190 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 191 192 rval = 0; 193 switch (argc) { 194 case 0: 195 if (all) 196 while ((fs = getfsent()) != NULL) { 197 if (BADTYPE(fs->fs_type)) 198 continue; 199 if (checkvfsname(fs->fs_vfstype, vfslist)) 200 continue; 201 if (hasopt(fs->fs_mntops, "noauto")) 202 continue; 203 if (mountfs(fs->fs_vfstype, fs->fs_spec, 204 fs->fs_file, init_flags, options, 205 fs->fs_mntops, !forceall)) 206 rval = 1; 207 } 208 else { 209 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 210 err(1, "getmntinfo"); 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 /* NOTREACHED */ 220 case 1: 221 if (vfslist != NULL) { 222 usage(); 223 /* NOTREACHED */ 224 } 225 226 if (init_flags & MNT_UPDATE) { 227 if ((mntbuf = getmntpt(*argv)) == NULL) 228 errx(1, 229 "unknown special file or file system %s.", 230 *argv); 231 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 232 mntfromname = fs->fs_spec; 233 /* ignore the fstab file options. */ 234 fs->fs_mntops = NULL; 235 } else 236 mntfromname = mntbuf->f_mntfromname; 237 mntonname = mntbuf->f_mntonname; 238 fstypename = mntbuf->f_fstypename; 239 mountopts = NULL; 240 } else { 241 if ((fs = getfsfile(*argv)) == NULL && 242 (fs = getfsspec(*argv)) == NULL) 243 errx(1, 244 "%s: unknown special file or file system.", 245 *argv); 246 if (BADTYPE(fs->fs_type)) 247 errx(1, "%s has unknown file system type.", 248 *argv); 249 mntfromname = fs->fs_spec; 250 mntonname = fs->fs_file; 251 fstypename = fs->fs_vfstype; 252 mountopts = fs->fs_mntops; 253 } 254 rval = mountfs(fstypename, mntfromname, 255 mntonname, init_flags, options, mountopts, 0); 256 break; 257 case 2: 258 /* 259 * If -t flag has not been specified, and spec contains either 260 * a ':' or a '@' then assume that an NFS filesystem is being 261 * specified ala Sun. 262 */ 263 if (vfslist == NULL) { 264 if (strpbrk(argv[0], ":@") != NULL) 265 vfstype = "nfs"; 266 else { 267 vfstype = getfslab(argv[0]); 268 if (vfstype == NULL) 269 vfstype = ffs_fstype; 270 } 271 } 272 rval = mountfs(vfstype, 273 argv[0], argv[1], init_flags, options, NULL, 0); 274 break; 275 default: 276 usage(); 277 /* NOTREACHED */ 278 } 279 280 /* 281 * If the mount was successfully, and done by root, tell mountd the 282 * good news. Pid checks are probably unnecessary, but don't hurt. 283 */ 284 if (rval == 0 && getuid() == 0 && 285 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 286 int pid; 287 288 if (fscanf(mountdfp, "%d", &pid) == 1 && 289 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 290 err(1, "signal mountd"); 291 (void)fclose(mountdfp); 292 } 293 294 exit(rval); 295 /* NOTREACHED */ 296 } 297 298 int 299 hasopt(mntopts, option) 300 const char *mntopts, *option; 301 { 302 int negative, found; 303 char *opt, *optbuf; 304 305 if (option[0] == 'n' && option[1] == 'o') { 306 negative = 1; 307 option += 2; 308 } else 309 negative = 0; 310 optbuf = strdup(mntopts); 311 found = 0; 312 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 313 if (opt[0] == 'n' && opt[1] == 'o') { 314 if (!strcasecmp(opt + 2, option)) 315 found = negative; 316 } else if (!strcasecmp(opt, option)) 317 found = !negative; 318 } 319 free(optbuf); 320 return (found); 321 } 322 323 static int 324 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 325 const char *vfstype, *spec, *name, *options, *mntopts; 326 int flags, skipmounted; 327 { 328 /* List of directories containing mount_xxx subcommands. */ 329 static const char *edirs[] = { 330 _PATH_SBIN, 331 _PATH_USRSBIN, 332 NULL 333 }; 334 const char **argv, **edir; 335 struct statfs *sfp, sf; 336 pid_t pid; 337 int argc, numfs, i, status, maxargc; 338 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 339 mntpath[MAXPATHLEN]; 340 341 #ifdef __GNUC__ 342 (void) &name; 343 (void) &optbuf; 344 (void) &vfstype; 345 #endif 346 347 if (realpath(name, mntpath) == NULL) { 348 warn("realpath %s", name); 349 return (1); 350 } 351 352 name = mntpath; 353 354 optbuf = NULL; 355 if (mntopts) 356 catopt(&optbuf, mntopts); 357 if (options) 358 catopt(&optbuf, options); 359 if (!mntopts && !options) 360 catopt(&optbuf, "rw"); 361 362 if (!strcmp(name, "/")) 363 flags |= MNT_UPDATE; 364 else if (skipmounted) { 365 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 366 warn("getmntinfo"); 367 return (1); 368 } 369 for(i = 0; i < numfs; i++) { 370 /* 371 * XXX can't check f_mntfromname, 372 * thanks to mfs, union, etc. 373 */ 374 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 375 strncmp(vfstype, sfp[i].f_fstypename, 376 MFSNAMELEN) == 0) { 377 if (verbose) 378 (void)printf("%s on %s type %.*s: " 379 "%s\n", 380 sfp[i].f_mntfromname, 381 sfp[i].f_mntonname, 382 MFSNAMELEN, 383 sfp[i].f_fstypename, 384 "already mounted"); 385 return (0); 386 } 387 } 388 } 389 if (flags & MNT_FORCE) 390 catopt(&optbuf, "force"); 391 if (flags & MNT_RDONLY) 392 catopt(&optbuf, "ro"); 393 394 if (flags & MNT_UPDATE) { 395 catopt(&optbuf, "update"); 396 /* Figure out the fstype only if we defaulted to ffs */ 397 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 398 vfstype = sf.f_fstypename; 399 } 400 401 maxargc = 64; 402 argv = malloc(sizeof(char *) * maxargc); 403 404 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 405 argc = 0; 406 argv[argc++] = execbase; 407 if (optbuf) 408 mangle(optbuf, &argc, &argv, &maxargc); 409 argv[argc++] = spec; 410 argv[argc++] = name; 411 argv[argc] = NULL; 412 413 if (verbose) { 414 (void)printf("exec:"); 415 for (i = 0; i < argc; i++) 416 (void)printf(" %s", argv[i]); 417 (void)printf("\n"); 418 } 419 420 switch (pid = vfork()) { 421 case -1: /* Error. */ 422 warn("vfork"); 423 if (optbuf) 424 free(optbuf); 425 return (1); 426 427 case 0: /* Child. */ 428 if (debug) 429 _exit(0); 430 431 /* Go find an executable. */ 432 edir = edirs; 433 do { 434 (void)snprintf(execname, 435 sizeof(execname), "%s/%s", *edir, execbase); 436 (void)execv(execname, (char * const *)argv); 437 if (errno != ENOENT) 438 warn("exec %s for %s", execname, name); 439 } while (*++edir != NULL); 440 441 if (errno == ENOENT) 442 warnx("%s not found for %s", execbase, name); 443 _exit(1); 444 /* NOTREACHED */ 445 446 default: /* Parent. */ 447 if (optbuf) 448 free(optbuf); 449 450 if (waitpid(pid, &status, 0) < 0) { 451 warn("waitpid"); 452 return (1); 453 } 454 455 if (WIFEXITED(status)) { 456 if (WEXITSTATUS(status) != 0) 457 return (WEXITSTATUS(status)); 458 } else if (WIFSIGNALED(status)) { 459 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 460 return (1); 461 } 462 463 if (verbose) { 464 if (statfs(name, &sf) < 0) { 465 warn("statfs %s", name); 466 return (1); 467 } 468 prmount(&sf); 469 } 470 break; 471 } 472 473 return (0); 474 } 475 476 static void 477 prmount(sfp) 478 struct statfs *sfp; 479 { 480 int flags; 481 const struct opt *o; 482 struct passwd *pw; 483 int f; 484 485 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, 486 sfp->f_mntonname, MFSNAMELEN, sfp->f_fstypename); 487 488 flags = sfp->f_flags & MNT_VISFLAGMASK; 489 for (f = 0, o = optnames; flags && o->o_opt; o++) 490 if (flags & o->o_opt) { 491 if (!o->o_silent) 492 (void)printf("%s%s", !f++ ? " (" : ", ", 493 o->o_name); 494 flags &= ~o->o_opt; 495 } 496 if (flags) 497 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 498 flags & (flags - 1) ? "s" : "", flags); 499 if (sfp->f_owner) { 500 (void)printf("%smounted by ", !f++ ? " (" : ", "); 501 if ((pw = getpwuid(sfp->f_owner)) != NULL) 502 (void)printf("%s", pw->pw_name); 503 else 504 (void)printf("%d", sfp->f_owner); 505 } 506 if (verbose) 507 (void)printf("%swrites: sync %ld async %ld)\n", 508 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 509 else 510 (void)printf("%s", f ? ")\n" : "\n"); 511 } 512 513 static struct statfs * 514 getmntpt(name) 515 const char *name; 516 { 517 struct statfs *mntbuf; 518 int i, mntsize; 519 520 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 521 for (i = 0; i < mntsize; i++) 522 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 523 strcmp(mntbuf[i].f_mntonname, name) == 0) 524 return (&mntbuf[i]); 525 return (NULL); 526 } 527 528 static void 529 catopt(sp, o) 530 char **sp; 531 const char *o; 532 { 533 char *s; 534 size_t i, j; 535 536 s = *sp; 537 if (s) { 538 i = strlen(s); 539 j = i + 1 + strlen(o) + 1; 540 s = realloc(s, j); 541 (void)snprintf(s + i, j, ",%s", o); 542 } else 543 s = strdup(o); 544 *sp = s; 545 } 546 547 static void 548 mangle(options, argcp, argvp, maxargcp) 549 char *options; 550 int *argcp, *maxargcp; 551 const char ***argvp; 552 { 553 char *p, *s; 554 int argc, maxargc; 555 const char **argv; 556 557 argc = *argcp; 558 argv = *argvp; 559 maxargc = *maxargcp; 560 561 for (s = options; (p = strsep(&s, ",")) != NULL;) { 562 /* Always leave space for one more argument and the NULL. */ 563 if (argc >= maxargc - 4) { 564 maxargc <<= 1; 565 argv = realloc(argv, maxargc * sizeof(char *)); 566 } 567 if (*p != '\0') { 568 if (*p == '-') { 569 argv[argc++] = p; 570 p = strchr(p, '='); 571 if (p) { 572 *p = '\0'; 573 argv[argc++] = p+1; 574 } 575 } else if (strcmp(p, "rw") != 0) { 576 argv[argc++] = "-o"; 577 argv[argc++] = p; 578 } 579 } 580 } 581 582 *argcp = argc; 583 *argvp = argv; 584 *maxargcp = maxargc; 585 } 586 587 /* Deduce the filesystem type from the disk label. */ 588 static const char * 589 getfslab(str) 590 const char *str; 591 { 592 struct disklabel dl; 593 int fd; 594 int part; 595 const char *vfstype; 596 u_char fstype; 597 char buf[MAXPATHLEN + 1]; 598 char *sp, *ep; 599 600 if ((fd = open(str, O_RDONLY)) == -1) { 601 /* 602 * Iff we get EBUSY try the raw device. Since mount always uses 603 * the block device we know we are never passed a raw device. 604 */ 605 if (errno != EBUSY) 606 err(1, "cannot open `%s'", str); 607 strlcpy(buf, str, MAXPATHLEN); 608 if ((sp = strrchr(buf, '/')) != NULL) 609 ++sp; 610 else 611 sp = buf; 612 for (ep = sp + strlen(sp) + 1; ep > sp; ep--) 613 *ep = *(ep - 1); 614 *sp = 'r'; 615 616 /* Silently fail here - mount call can display error */ 617 if ((fd = open(buf, O_RDONLY)) == -1) 618 return (NULL); 619 } 620 621 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 622 warn("cannot get disklabel for `%s'", str); 623 return (NULL); 624 } 625 626 (void) close(fd); 627 628 part = str[strlen(str) - 1] - 'a'; 629 630 if (part < 0 || part >= dl.d_npartitions) 631 errx(1, "partition `%s' is not defined on disk", str); 632 633 /* Return NULL for unknown types - caller can fall back to ffs */ 634 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 635 vfstype = NULL; 636 else 637 vfstype = mountnames[fstype]; 638 639 return (vfstype); 640 } 641 642 static void 643 usage() 644 { 645 646 (void)fprintf(stderr, 647 "usage: mount %s\n mount %s\n mount %s\n", 648 "[-dfruvw] [-o options] [-t ffs | external_type] special node", 649 "[-adfruvw] [-t ffs | external_type]", 650 "[-dfruvw] special | node"); 651 exit(1); 652 /* NOTREACHED */ 653 } 654
Indexes created Tue Sep 30 20:09:53 GMT 2025