mount.c revision 1.51
1 /* $NetBSD: mount.c,v 1.51 2000/10/11 17:56:05 abs 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 1.51 2000/10/11 17:56:05 abs 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 int debug, verbose; 72 73 int checkvfsname __P((const char *, const char **)); 74 void catopt __P((char **, const char *)); 75 struct statfs 76 *getmntpt __P((const char *)); 77 int hasopt __P((const char *, const char *)); 78 const char 79 **makevfslist __P((char *)); 80 const static char * 81 getfslab __P((const char *str)); 82 static void 83 mangle __P((char *, int *, const char ***, int *)); 84 int mountfs __P((const char *, const char *, const char *, 85 int, const char *, const char *, int)); 86 void prmount __P((struct statfs *)); 87 void usage __P((void)); 88 int main __P((int, char *[])); 89 90 /* Map from mount otions to printable formats. */ 91 static struct opt { 92 int o_opt; 93 int o_silent; 94 const char *o_name; 95 } optnames[] = { 96 { MNT_ASYNC, 0, "asynchronous" }, 97 { MNT_DEFEXPORTED, 1, "exported to the world" }, 98 { MNT_EXKERB, 1, "kerberos uid mapping" }, 99 { MNT_EXPORTED, 0, "NFS exported" }, 100 { MNT_EXPORTANON, 1, "anon uid mapping" }, 101 { MNT_EXRDONLY, 1, "exported read-only" }, 102 { MNT_LOCAL, 0, "local" }, 103 { MNT_NOATIME, 0, "noatime" }, 104 { MNT_NOCOREDUMP, 0, "nocoredump" }, 105 { MNT_NODEV, 0, "nodev" }, 106 { MNT_NODEVMTIME, 0, "nodevmtime" }, 107 { MNT_NOEXEC, 0, "noexec" }, 108 { MNT_NOSUID, 0, "nosuid" }, 109 { MNT_QUOTA, 0, "with quotas" }, 110 { MNT_RDONLY, 0, "read-only" }, 111 { MNT_ROOTFS, 1, "root file system" }, 112 { MNT_SYMPERM, 0, "symperm" }, 113 { MNT_SYNCHRONOUS, 0, "synchronous" }, 114 { MNT_UNION, 0, "union" }, 115 { MNT_SOFTDEP, 0, "soft dependencies" }, 116 { 0 } 117 }; 118 119 static char ffs_fstype[] = "ffs"; 120 121 int 122 main(argc, argv) 123 int argc; 124 char *argv[]; 125 { 126 const char *mntfromname, *mntonname, **vfslist, *vfstype; 127 struct fstab *fs; 128 struct statfs *mntbuf; 129 FILE *mountdfp; 130 int all, ch, forceall, i, init_flags, mntsize, rval; 131 char *options; 132 const char *mountopts, *fstypename; 133 134 all = forceall = init_flags = 0; 135 options = NULL; 136 vfslist = NULL; 137 vfstype = ffs_fstype; 138 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 139 switch (ch) { 140 case 'A': 141 all = forceall = 1; 142 break; 143 case 'a': 144 all = 1; 145 break; 146 case 'd': 147 debug = 1; 148 break; 149 case 'f': 150 init_flags |= MNT_FORCE; 151 break; 152 case 'o': 153 if (*optarg) 154 catopt(&options, optarg); 155 break; 156 case 'r': 157 init_flags |= MNT_RDONLY; 158 break; 159 case 't': 160 if (vfslist != NULL) 161 errx(1, "only one -t option may be specified."); 162 vfslist = makevfslist(optarg); 163 vfstype = optarg; 164 break; 165 case 'u': 166 init_flags |= MNT_UPDATE; 167 break; 168 case 'v': 169 verbose = 1; 170 break; 171 case 'w': 172 init_flags &= ~MNT_RDONLY; 173 break; 174 case '?': 175 default: 176 usage(); 177 /* NOTREACHED */ 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 (all) 190 while ((fs = getfsent()) != NULL) { 191 if (BADTYPE(fs->fs_type)) 192 continue; 193 if (checkvfsname(fs->fs_vfstype, vfslist)) 194 continue; 195 if (hasopt(fs->fs_mntops, "noauto")) 196 continue; 197 if (mountfs(fs->fs_vfstype, fs->fs_spec, 198 fs->fs_file, init_flags, options, 199 fs->fs_mntops, !forceall)) 200 rval = 1; 201 } 202 else { 203 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 204 err(1, "getmntinfo"); 205 for (i = 0; i < mntsize; i++) { 206 if (checkvfsname(mntbuf[i].f_fstypename, 207 vfslist)) 208 continue; 209 prmount(&mntbuf[i]); 210 } 211 } 212 exit(rval); 213 /* NOTREACHED */ 214 case 1: 215 if (vfslist != NULL) { 216 usage(); 217 /* NOTREACHED */ 218 } 219 220 if (init_flags & MNT_UPDATE) { 221 if ((mntbuf = getmntpt(*argv)) == NULL) 222 errx(1, 223 "unknown special file or file system %s.", 224 *argv); 225 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 226 mntfromname = fs->fs_spec; 227 /* ignore the fstab file options. */ 228 fs->fs_mntops = NULL; 229 } else 230 mntfromname = mntbuf->f_mntfromname; 231 mntonname = mntbuf->f_mntonname; 232 fstypename = mntbuf->f_fstypename; 233 mountopts = NULL; 234 } else { 235 if ((fs = getfsfile(*argv)) == NULL && 236 (fs = getfsspec(*argv)) == NULL) 237 errx(1, 238 "%s: unknown special file or file system.", 239 *argv); 240 if (BADTYPE(fs->fs_type)) 241 errx(1, "%s has unknown file system type.", 242 *argv); 243 mntfromname = fs->fs_spec; 244 mntonname = fs->fs_file; 245 fstypename = fs->fs_vfstype; 246 mountopts = fs->fs_mntops; 247 } 248 rval = mountfs(fstypename, mntfromname, 249 mntonname, init_flags, options, mountopts, 0); 250 break; 251 case 2: 252 /* 253 * If -t flag has not been specified, and spec contains either 254 * a ':' or a '@' then assume that an NFS filesystem is being 255 * specified ala Sun. 256 */ 257 if (vfslist == NULL) { 258 if (strpbrk(argv[0], ":@") != NULL) 259 vfstype = "nfs"; 260 else { 261 vfstype = getfslab(argv[0]); 262 if (vfstype == NULL) 263 vfstype = ffs_fstype; 264 } 265 } 266 rval = mountfs(vfstype, 267 argv[0], argv[1], init_flags, options, NULL, 0); 268 break; 269 default: 270 usage(); 271 /* NOTREACHED */ 272 } 273 274 /* 275 * If the mount was successfully, and done by root, tell mountd the 276 * good news. Pid checks are probably unnecessary, but don't hurt. 277 */ 278 if (rval == 0 && getuid() == 0 && 279 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 280 int pid; 281 282 if (fscanf(mountdfp, "%d", &pid) == 1 && 283 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 284 err(1, "signal mountd"); 285 (void)fclose(mountdfp); 286 } 287 288 exit(rval); 289 /* NOTREACHED */ 290 } 291 292 int 293 hasopt(mntopts, option) 294 const char *mntopts, *option; 295 { 296 int negative, found; 297 char *opt, *optbuf; 298 299 if (option[0] == 'n' && option[1] == 'o') { 300 negative = 1; 301 option += 2; 302 } else 303 negative = 0; 304 optbuf = strdup(mntopts); 305 found = 0; 306 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 307 if (opt[0] == 'n' && opt[1] == 'o') { 308 if (!strcasecmp(opt + 2, option)) 309 found = negative; 310 } else if (!strcasecmp(opt, option)) 311 found = !negative; 312 } 313 free(optbuf); 314 return (found); 315 } 316 317 int 318 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 319 const char *vfstype, *spec, *name, *options, *mntopts; 320 int flags, skipmounted; 321 { 322 /* List of directories containing mount_xxx subcommands. */ 323 static const char *edirs[] = { 324 _PATH_SBIN, 325 _PATH_USRSBIN, 326 NULL 327 }; 328 const char **argv, **edir; 329 struct statfs *sfp, sf; 330 pid_t pid; 331 int argc, numfs, i, status, maxargc; 332 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 333 mntpath[MAXPATHLEN]; 334 335 #ifdef __GNUC__ 336 (void) &name; 337 (void) &optbuf; 338 (void) &vfstype; 339 #endif 340 341 if (realpath(name, mntpath) == NULL) { 342 warn("realpath %s", name); 343 return (1); 344 } 345 346 name = mntpath; 347 348 optbuf = NULL; 349 if (mntopts) 350 catopt(&optbuf, mntopts); 351 if (options) 352 catopt(&optbuf, options); 353 if (!mntopts && !options) 354 catopt(&optbuf, "rw"); 355 356 if (!strcmp(name, "/")) 357 flags |= MNT_UPDATE; 358 else if (skipmounted) { 359 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 360 warn("getmntinfo"); 361 return (1); 362 } 363 for(i = 0; i < numfs; i++) { 364 /* XXX can't check f_mntfromname, 365 thanks to mfs, union, etc. */ 366 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 367 strncmp(vfstype, sfp[i].f_fstypename, 368 MFSNAMELEN) == 0) { 369 if (verbose) 370 (void)printf("%s on %s type %.*s: %s\n", 371 sfp[i].f_mntfromname, 372 sfp[i].f_mntonname, 373 MFSNAMELEN, 374 sfp[i].f_fstypename, 375 "already mounted"); 376 return (0); 377 } 378 } 379 } 380 if (flags & MNT_FORCE) 381 catopt(&optbuf, "force"); 382 if (flags & MNT_RDONLY) 383 catopt(&optbuf, "ro"); 384 385 if (flags & MNT_UPDATE) { 386 catopt(&optbuf, "update"); 387 /* Figure out the fstype only if we defaulted to ffs */ 388 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 389 vfstype = sf.f_fstypename; 390 } 391 392 maxargc = 64; 393 argv = malloc(sizeof(char *) * maxargc); 394 395 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 396 argc = 0; 397 argv[argc++] = execbase; 398 if (optbuf) 399 mangle(optbuf, &argc, &argv, &maxargc); 400 argv[argc++] = spec; 401 argv[argc++] = name; 402 argv[argc] = NULL; 403 404 if (verbose) { 405 (void)printf("exec:"); 406 for (i = 0; i < argc; i++) 407 (void)printf(" %s", argv[i]); 408 (void)printf("\n"); 409 } 410 411 switch (pid = vfork()) { 412 case -1: /* Error. */ 413 warn("vfork"); 414 if (optbuf) 415 free(optbuf); 416 return (1); 417 418 case 0: /* Child. */ 419 if (debug) 420 _exit(0); 421 422 /* Go find an executable. */ 423 edir = edirs; 424 do { 425 (void)snprintf(execname, 426 sizeof(execname), "%s/%s", *edir, execbase); 427 (void)execv(execname, (char * const *)argv); 428 if (errno != ENOENT) 429 warn("exec %s for %s", execname, name); 430 } while (*++edir != NULL); 431 432 if (errno == ENOENT) 433 warnx("%s not found for %s", execbase, name); 434 _exit(1); 435 /* NOTREACHED */ 436 437 default: /* Parent. */ 438 if (optbuf) 439 free(optbuf); 440 441 if (waitpid(pid, &status, 0) < 0) { 442 warn("waitpid"); 443 return (1); 444 } 445 446 if (WIFEXITED(status)) { 447 if (WEXITSTATUS(status) != 0) 448 return (WEXITSTATUS(status)); 449 } else if (WIFSIGNALED(status)) { 450 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 451 return (1); 452 } 453 454 if (verbose) { 455 if (statfs(name, &sf) < 0) { 456 warn("statfs %s", name); 457 return (1); 458 } 459 prmount(&sf); 460 } 461 break; 462 } 463 464 return (0); 465 } 466 467 void 468 prmount(sfp) 469 struct statfs *sfp; 470 { 471 int flags; 472 struct opt *o; 473 struct passwd *pw; 474 int f; 475 476 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, sfp->f_mntonname, 477 MFSNAMELEN, sfp->f_fstypename); 478 479 flags = sfp->f_flags & MNT_VISFLAGMASK; 480 for (f = 0, o = optnames; flags && o->o_opt; o++) 481 if (flags & o->o_opt) { 482 if (!o->o_silent) 483 (void)printf("%s%s", !f++ ? " (" : ", ", 484 o->o_name); 485 flags &= ~o->o_opt; 486 } 487 if (flags) 488 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 489 flags & (flags - 1) ? "s" : "", flags); 490 if (sfp->f_owner) { 491 (void)printf("%smounted by ", !f++ ? " (" : ", "); 492 if ((pw = getpwuid(sfp->f_owner)) != NULL) 493 (void)printf("%s", pw->pw_name); 494 else 495 (void)printf("%d", sfp->f_owner); 496 } 497 if (verbose) 498 (void)printf("%swrites: sync %ld async %ld)\n", 499 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 500 else 501 (void)printf("%s", f ? ")\n" : "\n"); 502 } 503 504 struct statfs * 505 getmntpt(name) 506 const char *name; 507 { 508 struct statfs *mntbuf; 509 int i, mntsize; 510 511 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 512 for (i = 0; i < mntsize; i++) 513 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 514 strcmp(mntbuf[i].f_mntonname, name) == 0) 515 return (&mntbuf[i]); 516 return (NULL); 517 } 518 519 void 520 catopt(sp, o) 521 char **sp; 522 const char *o; 523 { 524 char *s; 525 size_t i, j; 526 527 s = *sp; 528 if (s) { 529 i = strlen(s); 530 j = i + 1 + strlen(o) + 1; 531 s = realloc(s, j); 532 (void)snprintf(s + i, j, ",%s", o); 533 } else 534 s = strdup(o); 535 *sp = s; 536 } 537 538 static void 539 mangle(options, argcp, argvp, maxargcp) 540 char *options; 541 int *argcp, *maxargcp; 542 const char ***argvp; 543 { 544 char *p, *s; 545 int argc, maxargc; 546 const char **argv; 547 548 argc = *argcp; 549 argv = *argvp; 550 maxargc = *maxargcp; 551 552 for (s = options; (p = strsep(&s, ",")) != NULL;) { 553 /* Always leave space for one more argument and the NULL. */ 554 if (argc >= maxargc - 4) { 555 maxargc <<= 1; 556 argv = realloc(argv, maxargc * sizeof(char *)); 557 } 558 if (*p != '\0') { 559 if (*p == '-') { 560 argv[argc++] = p; 561 p = strchr(p, '='); 562 if (p) { 563 *p = '\0'; 564 argv[argc++] = p+1; 565 } 566 } else if (strcmp(p, "rw") != 0) { 567 argv[argc++] = "-o"; 568 argv[argc++] = p; 569 } 570 } 571 } 572 573 *argcp = argc; 574 *argvp = argv; 575 *maxargcp = maxargc; 576 } 577 578 /* deduce the filesystem type from the disk label */ 579 580 const static char * 581 getfslab(str) 582 const char *str; 583 { 584 struct disklabel dl; 585 int fd; 586 int part; 587 const char *vfstype; 588 u_char fstype; 589 char buf[MAXPATHLEN+1]; 590 char *sp, *ep; 591 592 if ((fd = open(str, O_RDONLY)) == -1) { 593 /* 594 * Iff we get EBUSY try the raw device. Since mount always uses 595 * the block device we know we are never passed a raw device. 596 */ 597 if (errno != EBUSY) 598 err(1, "cannot open `%s'", str); 599 strlcpy(buf, str, MAXPATHLEN); 600 if ((sp = strrchr(buf, '/')) != NULL) 601 ++sp; 602 else 603 sp = buf; 604 for( ep = sp + strlen(sp) + 1 ; ep > sp ; ep-- ) 605 *ep = *(ep-1); 606 *sp = 'r'; 607 608 /* Silently fail here - mount call can display error */ 609 if ((fd = open(buf, O_RDONLY)) == -1) 610 return NULL; 611 } 612 613 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 614 warn("cannot get disklabel for `%s'", str); 615 return NULL; 616 } 617 618 (void) close(fd); 619 620 part = str[strlen(str) - 1] - 'a'; 621 622 if (part < 0 || part >= dl.d_npartitions) 623 errx(1, "partition `%s' is not defined on disk", str); 624 625 /* Return NULL for unknown types - caller can fall back to ffs */ 626 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 627 vfstype = NULL; 628 else 629 vfstype = mountnames[fstype]; 630 631 return vfstype; 632 } 633 634 void 635 usage() 636 { 637 638 (void)fprintf(stderr, 639 "usage: mount %s %s\n mount %s\n mount %s\n", 640 "[-dfruvw] [-o options] [-t ffs | external_type]", 641 "special node", 642 "[-adfruvw] [-t ffs | external_type]", 643 "[-dfruvw] special | node"); 644 exit(1); 645 /* NOTREACHED */ 646 } 647
Indexes created Mon Sep 29 18:09:42 GMT 2025