mount.c revision 1.55
1 /* $NetBSD: mount.c,v 1.55 2000/11/01 04:10:02 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 1.55 2000/11/01 04:10:02 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 #include "vfslist.h" 71 72 static int debug, verbose; 73 74 static void catopt __P((char **, const char *)); 75 static const char * 76 getfslab __P((const char *str)); 77 static struct statfs * 78 getmntpt __P((const char *)); 79 static int hasopt __P((const char *, const char *)); 80 static void mangle __P((char *, int *, const char ***, int *)); 81 static int mountfs __P((const char *, const char *, const char *, 82 int, const char *, const char *, int)); 83 static void prmount __P((struct statfs *)); 84 static void usage __P((void)); 85 86 void checkname __P((int, char *[])); 87 int main __P((int, char *[])); 88 89 /* Map from mount otions to printable formats. */ 90 static const struct opt { 91 int o_opt; 92 int o_silent; 93 const char *o_name; 94 } optnames[] = { 95 { MNT_ASYNC, 0, "asynchronous" }, 96 { MNT_DEFEXPORTED, 1, "exported to the world" }, 97 { MNT_EXKERB, 1, "kerberos uid mapping" }, 98 { MNT_EXPORTED, 0, "NFS exported" }, 99 { MNT_EXPORTANON, 1, "anon uid mapping" }, 100 { MNT_EXRDONLY, 1, "exported read-only" }, 101 { MNT_LOCAL, 0, "local" }, 102 { MNT_NOATIME, 0, "noatime" }, 103 { MNT_NOCOREDUMP, 0, "nocoredump" }, 104 { MNT_NODEV, 0, "nodev" }, 105 { MNT_NODEVMTIME, 0, "nodevmtime" }, 106 { MNT_NOEXEC, 0, "noexec" }, 107 { MNT_NOSUID, 0, "nosuid" }, 108 { MNT_QUOTA, 0, "with quotas" }, 109 { MNT_RDONLY, 0, "read-only" }, 110 { MNT_ROOTFS, 1, "root file system" }, 111 { MNT_SYMPERM, 0, "symperm" }, 112 { MNT_SYNCHRONOUS, 0, "synchronous" }, 113 { MNT_UNION, 0, "union" }, 114 { MNT_SOFTDEP, 0, "soft dependencies" }, 115 { 0 } 116 }; 117 118 static char ffs_fstype[] = "ffs"; 119 120 int 121 main(argc, argv) 122 int argc; 123 char *argv[]; 124 { 125 const char *mntfromname, *mntonname, **vfslist, *vfstype; 126 struct fstab *fs; 127 struct statfs *mntbuf; 128 FILE *mountdfp; 129 int all, ch, forceall, i, init_flags, mntsize, rval; 130 char *options; 131 const char *mountopts, *fstypename; 132 133 /* if called as specific mount, call it's main mount routine */ 134 checkname(argc, argv); 135 136 /* started as "mount" */ 137 all = forceall = init_flags = 0; 138 options = NULL; 139 vfslist = NULL; 140 vfstype = ffs_fstype; 141 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 142 switch (ch) { 143 case 'A': 144 all = forceall = 1; 145 break; 146 case 'a': 147 all = 1; 148 break; 149 case 'd': 150 debug = 1; 151 break; 152 case 'f': 153 init_flags |= MNT_FORCE; 154 break; 155 case 'o': 156 if (*optarg) 157 catopt(&options, optarg); 158 break; 159 case 'r': 160 init_flags |= MNT_RDONLY; 161 break; 162 case 't': 163 if (vfslist != NULL) 164 errx(1, 165 "only one -t option may be specified."); 166 vfslist = makevfslist(optarg); 167 vfstype = optarg; 168 break; 169 case 'u': 170 init_flags |= MNT_UPDATE; 171 break; 172 case 'v': 173 verbose = 1; 174 break; 175 case 'w': 176 init_flags &= ~MNT_RDONLY; 177 break; 178 case '?': 179 default: 180 usage(); 181 /* NOTREACHED */ 182 } 183 argc -= optind; 184 argv += optind; 185 186 #define BADTYPE(type) \ 187 (strcmp(type, FSTAB_RO) && \ 188 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 189 190 rval = 0; 191 switch (argc) { 192 case 0: 193 if (all) 194 while ((fs = getfsent()) != NULL) { 195 if (BADTYPE(fs->fs_type)) 196 continue; 197 if (checkvfsname(fs->fs_vfstype, vfslist)) 198 continue; 199 if (hasopt(fs->fs_mntops, "noauto")) 200 continue; 201 if (mountfs(fs->fs_vfstype, fs->fs_spec, 202 fs->fs_file, init_flags, options, 203 fs->fs_mntops, !forceall)) 204 rval = 1; 205 } 206 else { 207 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 208 err(1, "getmntinfo"); 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 /* NOTREACHED */ 218 case 1: 219 if (vfslist != NULL) { 220 usage(); 221 /* NOTREACHED */ 222 } 223 224 if (init_flags & MNT_UPDATE) { 225 if ((mntbuf = getmntpt(*argv)) == NULL) 226 errx(1, 227 "unknown special file or file system %s.", 228 *argv); 229 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 230 mntfromname = fs->fs_spec; 231 /* ignore the fstab file options. */ 232 fs->fs_mntops = NULL; 233 } else 234 mntfromname = mntbuf->f_mntfromname; 235 mntonname = mntbuf->f_mntonname; 236 fstypename = mntbuf->f_fstypename; 237 mountopts = NULL; 238 } else { 239 if ((fs = getfsfile(*argv)) == NULL && 240 (fs = getfsspec(*argv)) == NULL) 241 errx(1, 242 "%s: unknown special file or file system.", 243 *argv); 244 if (BADTYPE(fs->fs_type)) 245 errx(1, "%s has unknown file system type.", 246 *argv); 247 mntfromname = fs->fs_spec; 248 mntonname = fs->fs_file; 249 fstypename = fs->fs_vfstype; 250 mountopts = fs->fs_mntops; 251 } 252 rval = mountfs(fstypename, mntfromname, 253 mntonname, init_flags, options, mountopts, 0); 254 break; 255 case 2: 256 /* 257 * If -t flag has not been specified, and spec contains either 258 * a ':' or a '@' then assume that an NFS filesystem is being 259 * specified ala Sun. 260 */ 261 if (vfslist == NULL) { 262 if (strpbrk(argv[0], ":@") != NULL) 263 vfstype = "nfs"; 264 else { 265 vfstype = getfslab(argv[0]); 266 if (vfstype == NULL) 267 vfstype = ffs_fstype; 268 } 269 } 270 rval = mountfs(vfstype, 271 argv[0], argv[1], init_flags, options, NULL, 0); 272 break; 273 default: 274 usage(); 275 /* NOTREACHED */ 276 } 277 278 /* 279 * If the mount was successfully, and done by root, tell mountd the 280 * good news. Pid checks are probably unnecessary, but don't hurt. 281 */ 282 if (rval == 0 && getuid() == 0 && 283 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 284 int pid; 285 286 if (fscanf(mountdfp, "%d", &pid) == 1 && 287 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 288 err(1, "signal mountd"); 289 (void)fclose(mountdfp); 290 } 291 292 exit(rval); 293 /* NOTREACHED */ 294 } 295 296 int 297 hasopt(mntopts, option) 298 const char *mntopts, *option; 299 { 300 int negative, found; 301 char *opt, *optbuf; 302 303 if (option[0] == 'n' && option[1] == 'o') { 304 negative = 1; 305 option += 2; 306 } else 307 negative = 0; 308 optbuf = strdup(mntopts); 309 found = 0; 310 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 311 if (opt[0] == 'n' && opt[1] == 'o') { 312 if (!strcasecmp(opt + 2, option)) 313 found = negative; 314 } else if (!strcasecmp(opt, option)) 315 found = !negative; 316 } 317 free(optbuf); 318 return (found); 319 } 320 321 static int 322 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 323 const char *vfstype, *spec, *name, *options, *mntopts; 324 int flags, skipmounted; 325 { 326 /* List of directories containing mount_xxx subcommands. */ 327 static const char *edirs[] = { 328 _PATH_SBIN, 329 _PATH_USRSBIN, 330 NULL 331 }; 332 const char **argv, **edir; 333 struct statfs *sfp, sf; 334 pid_t pid; 335 int argc, numfs, i, status, maxargc; 336 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 337 mntpath[MAXPATHLEN]; 338 339 #ifdef __GNUC__ 340 (void) &name; 341 (void) &optbuf; 342 (void) &vfstype; 343 #endif 344 345 if (realpath(name, mntpath) == NULL) { 346 warn("realpath %s", name); 347 return (1); 348 } 349 350 name = mntpath; 351 352 optbuf = NULL; 353 if (mntopts) 354 catopt(&optbuf, mntopts); 355 if (options) 356 catopt(&optbuf, options); 357 if (!mntopts && !options) 358 catopt(&optbuf, "rw"); 359 360 if (!strcmp(name, "/")) 361 flags |= MNT_UPDATE; 362 else if (skipmounted) { 363 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 364 warn("getmntinfo"); 365 return (1); 366 } 367 for(i = 0; i < numfs; i++) { 368 /* 369 * XXX can't check f_mntfromname, 370 * thanks to mfs, union, etc. 371 */ 372 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 373 strncmp(vfstype, sfp[i].f_fstypename, 374 MFSNAMELEN) == 0) { 375 if (verbose) 376 (void)printf("%s on %s type %.*s: " 377 "%s\n", 378 sfp[i].f_mntfromname, 379 sfp[i].f_mntonname, 380 MFSNAMELEN, 381 sfp[i].f_fstypename, 382 "already mounted"); 383 return (0); 384 } 385 } 386 } 387 if (flags & MNT_FORCE) 388 catopt(&optbuf, "force"); 389 if (flags & MNT_RDONLY) 390 catopt(&optbuf, "ro"); 391 392 if (flags & MNT_UPDATE) { 393 catopt(&optbuf, "update"); 394 /* Figure out the fstype only if we defaulted to ffs */ 395 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 396 vfstype = sf.f_fstypename; 397 } 398 399 maxargc = 64; 400 argv = malloc(sizeof(char *) * maxargc); 401 402 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 403 argc = 0; 404 argv[argc++] = execbase; 405 if (optbuf) 406 mangle(optbuf, &argc, &argv, &maxargc); 407 argv[argc++] = spec; 408 argv[argc++] = name; 409 argv[argc] = NULL; 410 411 if (verbose) { 412 (void)printf("exec:"); 413 for (i = 0; i < argc; i++) 414 (void)printf(" %s", argv[i]); 415 (void)printf("\n"); 416 } 417 418 switch (pid = vfork()) { 419 case -1: /* Error. */ 420 warn("vfork"); 421 if (optbuf) 422 free(optbuf); 423 return (1); 424 425 case 0: /* Child. */ 426 if (debug) 427 _exit(0); 428 429 /* Go find an executable. */ 430 edir = edirs; 431 do { 432 (void)snprintf(execname, 433 sizeof(execname), "%s/%s", *edir, execbase); 434 (void)execv(execname, (char * const *)argv); 435 if (errno != ENOENT) 436 warn("exec %s for %s", execname, name); 437 } while (*++edir != NULL); 438 439 if (errno == ENOENT) 440 warnx("%s not found for %s", execbase, name); 441 _exit(1); 442 /* NOTREACHED */ 443 444 default: /* Parent. */ 445 if (optbuf) 446 free(optbuf); 447 448 if (waitpid(pid, &status, 0) < 0) { 449 warn("waitpid"); 450 return (1); 451 } 452 453 if (WIFEXITED(status)) { 454 if (WEXITSTATUS(status) != 0) 455 return (WEXITSTATUS(status)); 456 } else if (WIFSIGNALED(status)) { 457 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 458 return (1); 459 } 460 461 if (verbose) { 462 if (statfs(name, &sf) < 0) { 463 warn("statfs %s", name); 464 return (1); 465 } 466 prmount(&sf); 467 } 468 break; 469 } 470 471 return (0); 472 } 473 474 static void 475 prmount(sfp) 476 struct statfs *sfp; 477 { 478 int flags; 479 const struct opt *o; 480 struct passwd *pw; 481 int f; 482 483 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, 484 sfp->f_mntonname, MFSNAMELEN, sfp->f_fstypename); 485 486 flags = sfp->f_flags & MNT_VISFLAGMASK; 487 for (f = 0, o = optnames; flags && o->o_opt; o++) 488 if (flags & o->o_opt) { 489 if (!o->o_silent) 490 (void)printf("%s%s", !f++ ? " (" : ", ", 491 o->o_name); 492 flags &= ~o->o_opt; 493 } 494 if (flags) 495 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 496 flags & (flags - 1) ? "s" : "", flags); 497 if (sfp->f_owner) { 498 (void)printf("%smounted by ", !f++ ? " (" : ", "); 499 if ((pw = getpwuid(sfp->f_owner)) != NULL) 500 (void)printf("%s", pw->pw_name); 501 else 502 (void)printf("%d", sfp->f_owner); 503 } 504 if (verbose) 505 (void)printf("%swrites: sync %ld async %ld)\n", 506 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 507 else 508 (void)printf("%s", f ? ")\n" : "\n"); 509 } 510 511 static struct statfs * 512 getmntpt(name) 513 const char *name; 514 { 515 struct statfs *mntbuf; 516 int i, mntsize; 517 518 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 519 for (i = 0; i < mntsize; i++) 520 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 521 strcmp(mntbuf[i].f_mntonname, name) == 0) 522 return (&mntbuf[i]); 523 return (NULL); 524 } 525 526 static void 527 catopt(sp, o) 528 char **sp; 529 const char *o; 530 { 531 char *s; 532 size_t i, j; 533 534 s = *sp; 535 if (s) { 536 i = strlen(s); 537 j = i + 1 + strlen(o) + 1; 538 s = realloc(s, j); 539 (void)snprintf(s + i, j, ",%s", o); 540 } else 541 s = strdup(o); 542 *sp = s; 543 } 544 545 static void 546 mangle(options, argcp, argvp, maxargcp) 547 char *options; 548 int *argcp, *maxargcp; 549 const char ***argvp; 550 { 551 char *p, *s; 552 int argc, maxargc; 553 const char **argv; 554 555 argc = *argcp; 556 argv = *argvp; 557 maxargc = *maxargcp; 558 559 for (s = options; (p = strsep(&s, ",")) != NULL;) { 560 /* Always leave space for one more argument and the NULL. */ 561 if (argc >= maxargc - 4) { 562 maxargc <<= 1; 563 argv = realloc(argv, maxargc * sizeof(char *)); 564 } 565 if (*p != '\0') { 566 if (*p == '-') { 567 argv[argc++] = p; 568 p = strchr(p, '='); 569 if (p) { 570 *p = '\0'; 571 argv[argc++] = p+1; 572 } 573 } else if (strcmp(p, "rw") != 0) { 574 argv[argc++] = "-o"; 575 argv[argc++] = p; 576 } 577 } 578 } 579 580 *argcp = argc; 581 *argvp = argv; 582 *maxargcp = maxargc; 583 } 584 585 /* Deduce the filesystem type from the disk label. */ 586 static const char * 587 getfslab(str) 588 const char *str; 589 { 590 struct disklabel dl; 591 int fd; 592 int part; 593 const char *vfstype; 594 u_char fstype; 595 char buf[MAXPATHLEN + 1]; 596 char *sp, *ep; 597 598 if ((fd = open(str, O_RDONLY)) == -1) { 599 /* 600 * Iff we get EBUSY try the raw device. Since mount always uses 601 * the block device we know we are never passed a raw device. 602 */ 603 if (errno != EBUSY) 604 err(1, "cannot open `%s'", str); 605 strlcpy(buf, str, MAXPATHLEN); 606 if ((sp = strrchr(buf, '/')) != NULL) 607 ++sp; 608 else 609 sp = buf; 610 for (ep = sp + strlen(sp) + 1; ep > sp; ep--) 611 *ep = *(ep - 1); 612 *sp = 'r'; 613 614 /* Silently fail here - mount call can display error */ 615 if ((fd = open(buf, O_RDONLY)) == -1) 616 return (NULL); 617 } 618 619 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 620 (void) close(fd); 621 return (NULL); 622 } 623 624 (void) close(fd); 625 626 part = str[strlen(str) - 1] - 'a'; 627 628 if (part < 0 || part >= dl.d_npartitions) 629 errx(1, "partition `%s' is not defined on disk", str); 630 631 /* Return NULL for unknown types - caller can fall back to ffs */ 632 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 633 vfstype = NULL; 634 else 635 vfstype = mountnames[fstype]; 636 637 return (vfstype); 638 } 639 640 static void 641 usage() 642 { 643 644 (void)fprintf(stderr, 645 "usage: mount %s\n mount %s\n mount %s\n", 646 "[-dfruvw] [-o options] [-t ffs | external_type] special node", 647 "[-adfruvw] [-t ffs | external_type]", 648 "[-dfruvw] special | node"); 649 exit(1); 650 /* NOTREACHED */ 651 } 652
Indexes created Tue Sep 30 07:10:03 GMT 2025