mount.c revision 1.60
1 /* $NetBSD: mount.c,v 1.60 2002/08/23 03:17:19 lukem 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 1.60 2002/08/23 03:17:19 lukem 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 #ifndef NO_MOUNT_PROGS 87 void checkname __P((int, char *[])); 88 #endif 89 int main __P((int, 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_FLAGS 98 }; 99 100 static char ffs_fstype[] = "ffs"; 101 102 int 103 main(argc, argv) 104 int argc; 105 char *argv[]; 106 { 107 const char *mntfromname, *mntonname, **vfslist, *vfstype; 108 struct fstab *fs; 109 struct statfs *mntbuf; 110 FILE *mountdfp; 111 int all, ch, forceall, i, init_flags, mntsize, rval; 112 char *options; 113 const char *mountopts, *fstypename; 114 115 #ifndef NO_MOUNT_PROGS 116 /* if called as specific mount, call it's main mount routine */ 117 checkname(argc, argv); 118 #endif 119 120 /* started as "mount" */ 121 all = forceall = init_flags = 0; 122 options = NULL; 123 vfslist = NULL; 124 vfstype = ffs_fstype; 125 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 126 switch (ch) { 127 case 'A': 128 all = forceall = 1; 129 break; 130 case 'a': 131 all = 1; 132 break; 133 case 'd': 134 debug = 1; 135 break; 136 case 'f': 137 init_flags |= MNT_FORCE; 138 break; 139 case 'o': 140 if (*optarg) 141 catopt(&options, optarg); 142 break; 143 case 'r': 144 init_flags |= MNT_RDONLY; 145 break; 146 case 't': 147 if (vfslist != NULL) 148 errx(1, 149 "only one -t option may be specified."); 150 vfslist = makevfslist(optarg); 151 vfstype = optarg; 152 break; 153 case 'u': 154 init_flags |= MNT_UPDATE; 155 break; 156 case 'v': 157 verbose = 1; 158 break; 159 case 'w': 160 init_flags &= ~MNT_RDONLY; 161 break; 162 case '?': 163 default: 164 usage(); 165 /* NOTREACHED */ 166 } 167 argc -= optind; 168 argv += optind; 169 170 #define BADTYPE(type) \ 171 (strcmp(type, FSTAB_RO) && \ 172 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 173 174 rval = 0; 175 switch (argc) { 176 case 0: 177 if (all) 178 while ((fs = getfsent()) != NULL) { 179 if (BADTYPE(fs->fs_type)) 180 continue; 181 if (checkvfsname(fs->fs_vfstype, vfslist)) 182 continue; 183 if (hasopt(fs->fs_mntops, "noauto")) 184 continue; 185 if (mountfs(fs->fs_vfstype, fs->fs_spec, 186 fs->fs_file, init_flags, options, 187 fs->fs_mntops, !forceall)) 188 rval = 1; 189 } 190 else { 191 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 192 err(1, "getmntinfo"); 193 for (i = 0; i < mntsize; i++) { 194 if (checkvfsname(mntbuf[i].f_fstypename, 195 vfslist)) 196 continue; 197 prmount(&mntbuf[i]); 198 } 199 } 200 exit(rval); 201 /* NOTREACHED */ 202 case 1: 203 if (vfslist != NULL) { 204 usage(); 205 /* NOTREACHED */ 206 } 207 208 if (init_flags & MNT_UPDATE) { 209 if ((mntbuf = getmntpt(*argv)) == NULL) 210 errx(1, 211 "unknown special file or file system %s.", 212 *argv); 213 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 214 mntfromname = fs->fs_spec; 215 /* ignore the fstab file options. */ 216 fs->fs_mntops = NULL; 217 } else 218 mntfromname = mntbuf->f_mntfromname; 219 mntonname = mntbuf->f_mntonname; 220 fstypename = mntbuf->f_fstypename; 221 mountopts = NULL; 222 } else { 223 if ((fs = getfsfile(*argv)) == NULL && 224 (fs = getfsspec(*argv)) == NULL) 225 errx(1, 226 "%s: unknown special file or file system.", 227 *argv); 228 if (BADTYPE(fs->fs_type)) 229 errx(1, "%s has unknown file system type.", 230 *argv); 231 mntfromname = fs->fs_spec; 232 mntonname = fs->fs_file; 233 fstypename = fs->fs_vfstype; 234 mountopts = fs->fs_mntops; 235 } 236 rval = mountfs(fstypename, mntfromname, 237 mntonname, init_flags, options, mountopts, 0); 238 break; 239 case 2: 240 /* 241 * If -t flag has not been specified, and spec contains either 242 * a ':' or a '@' then assume that an NFS filesystem is being 243 * specified ala Sun. 244 */ 245 if (vfslist == NULL) { 246 if (strpbrk(argv[0], ":@") != NULL) 247 vfstype = "nfs"; 248 else { 249 vfstype = getfslab(argv[0]); 250 if (vfstype == NULL) 251 vfstype = ffs_fstype; 252 } 253 } 254 rval = mountfs(vfstype, 255 argv[0], argv[1], init_flags, options, NULL, 0); 256 break; 257 default: 258 usage(); 259 /* NOTREACHED */ 260 } 261 262 /* 263 * If the mount was successfully, and done by root, tell mountd the 264 * good news. Pid checks are probably unnecessary, but don't hurt. 265 */ 266 if (rval == 0 && getuid() == 0 && 267 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 268 int pid; 269 270 if (fscanf(mountdfp, "%d", &pid) == 1 && 271 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 272 err(1, "signal mountd"); 273 (void)fclose(mountdfp); 274 } 275 276 exit(rval); 277 /* NOTREACHED */ 278 } 279 280 int 281 hasopt(mntopts, option) 282 const char *mntopts, *option; 283 { 284 int negative, found; 285 char *opt, *optbuf; 286 287 if (option[0] == 'n' && option[1] == 'o') { 288 negative = 1; 289 option += 2; 290 } else 291 negative = 0; 292 optbuf = strdup(mntopts); 293 found = 0; 294 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 295 if (opt[0] == 'n' && opt[1] == 'o') { 296 if (!strcasecmp(opt + 2, option)) 297 found = negative; 298 } else if (!strcasecmp(opt, option)) 299 found = !negative; 300 } 301 free(optbuf); 302 return (found); 303 } 304 305 static int 306 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 307 const char *vfstype, *spec, *name, *options, *mntopts; 308 int flags, skipmounted; 309 { 310 /* List of directories containing mount_xxx subcommands. */ 311 static const char *edirs[] = { 312 #ifdef _PATH_RESCUE 313 _PATH_RESCUE, 314 #endif 315 _PATH_SBIN, 316 _PATH_USRSBIN, 317 NULL 318 }; 319 const char **argv, **edir; 320 struct statfs *sfp, sf; 321 pid_t pid; 322 int argc, numfs, i, status, maxargc; 323 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 324 mntpath[MAXPATHLEN]; 325 326 #ifdef __GNUC__ 327 (void) &name; 328 (void) &optbuf; 329 (void) &vfstype; 330 #endif 331 332 if (realpath(name, mntpath) == NULL) { 333 warn("realpath %s", name); 334 return (1); 335 } 336 337 name = mntpath; 338 339 optbuf = NULL; 340 if (mntopts) 341 catopt(&optbuf, mntopts); 342 if (options) 343 catopt(&optbuf, options); 344 if (!mntopts && !options) 345 catopt(&optbuf, "rw"); 346 347 if (!strcmp(name, "/")) 348 flags |= MNT_UPDATE; 349 else if (skipmounted) { 350 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 351 warn("getmntinfo"); 352 return (1); 353 } 354 for(i = 0; i < numfs; i++) { 355 /* 356 * XXX can't check f_mntfromname, 357 * thanks to mfs, union, etc. 358 */ 359 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 360 strncmp(vfstype, sfp[i].f_fstypename, 361 MFSNAMELEN) == 0) { 362 if (verbose) 363 (void)printf("%s on %s type %.*s: " 364 "%s\n", 365 sfp[i].f_mntfromname, 366 sfp[i].f_mntonname, 367 MFSNAMELEN, 368 sfp[i].f_fstypename, 369 "already mounted"); 370 return (0); 371 } 372 } 373 } 374 if (flags & MNT_FORCE) 375 catopt(&optbuf, "force"); 376 if (flags & MNT_RDONLY) 377 catopt(&optbuf, "ro"); 378 379 if (flags & MNT_UPDATE) { 380 catopt(&optbuf, "update"); 381 /* Figure out the fstype only if we defaulted to ffs */ 382 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 383 vfstype = sf.f_fstypename; 384 } 385 386 maxargc = 64; 387 argv = malloc(sizeof(char *) * maxargc); 388 389 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 390 argc = 0; 391 argv[argc++] = execbase; 392 if (optbuf) 393 mangle(optbuf, &argc, &argv, &maxargc); 394 argv[argc++] = spec; 395 argv[argc++] = name; 396 argv[argc] = NULL; 397 398 if (verbose) { 399 (void)printf("exec:"); 400 for (i = 0; i < argc; i++) 401 (void)printf(" %s", argv[i]); 402 (void)printf("\n"); 403 } 404 405 switch (pid = vfork()) { 406 case -1: /* Error. */ 407 warn("vfork"); 408 if (optbuf) 409 free(optbuf); 410 return (1); 411 412 case 0: /* Child. */ 413 if (debug) 414 _exit(0); 415 416 /* Go find an executable. */ 417 edir = edirs; 418 do { 419 (void)snprintf(execname, 420 sizeof(execname), "%s/%s", *edir, execbase); 421 (void)execv(execname, (char * const *)argv); 422 if (errno != ENOENT) 423 warn("exec %s for %s", execname, name); 424 } while (*++edir != NULL); 425 426 if (errno == ENOENT) 427 warnx("%s not found for %s", execbase, name); 428 _exit(1); 429 /* NOTREACHED */ 430 431 default: /* Parent. */ 432 if (optbuf) 433 free(optbuf); 434 435 if (waitpid(pid, &status, 0) < 0) { 436 warn("waitpid"); 437 return (1); 438 } 439 440 if (WIFEXITED(status)) { 441 if (WEXITSTATUS(status) != 0) 442 return (WEXITSTATUS(status)); 443 } else if (WIFSIGNALED(status)) { 444 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 445 return (1); 446 } 447 448 if (verbose) { 449 if (statfs(name, &sf) < 0) { 450 warn("statfs %s", name); 451 return (1); 452 } 453 prmount(&sf); 454 } 455 break; 456 } 457 458 return (0); 459 } 460 461 static void 462 prmount(sfp) 463 struct statfs *sfp; 464 { 465 int flags; 466 const struct opt *o; 467 struct passwd *pw; 468 int f; 469 470 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, 471 sfp->f_mntonname, MFSNAMELEN, sfp->f_fstypename); 472 473 flags = sfp->f_flags & MNT_VISFLAGMASK; 474 for (f = 0, o = optnames; flags && o < 475 &optnames[sizeof(optnames)/sizeof(optnames[0])]; o++) 476 if (flags & o->o_opt) { 477 if (!o->o_silent || verbose) 478 (void)printf("%s%s", !f++ ? " (" : ", ", 479 o->o_name); 480 flags &= ~o->o_opt; 481 } 482 if (flags) 483 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 484 flags & (flags - 1) ? "s" : "", flags); 485 if (sfp->f_owner) { 486 (void)printf("%smounted by ", !f++ ? " (" : ", "); 487 if ((pw = getpwuid(sfp->f_owner)) != NULL) 488 (void)printf("%s", pw->pw_name); 489 else 490 (void)printf("%d", sfp->f_owner); 491 } 492 if (verbose) 493 (void)printf("%swrites: sync %ld async %ld)\n", 494 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 495 else 496 (void)printf("%s", f ? ")\n" : "\n"); 497 } 498 499 static struct statfs * 500 getmntpt(name) 501 const char *name; 502 { 503 struct statfs *mntbuf; 504 int i, mntsize; 505 506 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 507 for (i = 0; i < mntsize; i++) 508 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 509 strcmp(mntbuf[i].f_mntonname, name) == 0) 510 return (&mntbuf[i]); 511 return (NULL); 512 } 513 514 static void 515 catopt(sp, o) 516 char **sp; 517 const char *o; 518 { 519 char *s; 520 size_t i, j; 521 522 s = *sp; 523 if (s) { 524 i = strlen(s); 525 j = i + 1 + strlen(o) + 1; 526 s = realloc(s, j); 527 (void)snprintf(s + i, j, ",%s", o); 528 } else 529 s = strdup(o); 530 *sp = s; 531 } 532 533 static void 534 mangle(options, argcp, argvp, maxargcp) 535 char *options; 536 int *argcp, *maxargcp; 537 const char ***argvp; 538 { 539 char *p, *s; 540 int argc, maxargc; 541 const char **argv; 542 543 argc = *argcp; 544 argv = *argvp; 545 maxargc = *maxargcp; 546 547 for (s = options; (p = strsep(&s, ",")) != NULL;) { 548 /* Always leave space for one more argument and the NULL. */ 549 if (argc >= maxargc - 4) { 550 maxargc <<= 1; 551 argv = realloc(argv, maxargc * sizeof(char *)); 552 } 553 if (*p != '\0') { 554 if (*p == '-') { 555 argv[argc++] = p; 556 p = strchr(p, '='); 557 if (p) { 558 *p = '\0'; 559 argv[argc++] = p+1; 560 } 561 } else if (strcmp(p, "rw") != 0) { 562 argv[argc++] = "-o"; 563 argv[argc++] = p; 564 } 565 } 566 } 567 568 *argcp = argc; 569 *argvp = argv; 570 *maxargcp = maxargc; 571 } 572 573 /* Deduce the filesystem type from the disk label. */ 574 static const char * 575 getfslab(str) 576 const char *str; 577 { 578 struct disklabel dl; 579 int fd; 580 int part; 581 const char *vfstype; 582 u_char fstype; 583 char buf[MAXPATHLEN + 1]; 584 char *sp, *ep; 585 586 if ((fd = open(str, O_RDONLY)) == -1) { 587 /* 588 * Iff we get EBUSY try the raw device. Since mount always uses 589 * the block device we know we are never passed a raw device. 590 */ 591 if (errno != EBUSY) 592 err(1, "cannot open `%s'", str); 593 strlcpy(buf, str, MAXPATHLEN); 594 if ((sp = strrchr(buf, '/')) != NULL) 595 ++sp; 596 else 597 sp = buf; 598 for (ep = sp + strlen(sp) + 1; ep > sp; ep--) 599 *ep = *(ep - 1); 600 *sp = 'r'; 601 602 /* Silently fail here - mount call can display error */ 603 if ((fd = open(buf, O_RDONLY)) == -1) 604 return (NULL); 605 } 606 607 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 608 (void) close(fd); 609 return (NULL); 610 } 611 612 (void) close(fd); 613 614 part = str[strlen(str) - 1] - 'a'; 615 616 if (part < 0 || part >= dl.d_npartitions) 617 return (NULL); 618 619 /* Return NULL for unknown types - caller can fall back to ffs */ 620 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 621 vfstype = NULL; 622 else 623 vfstype = mountnames[fstype]; 624 625 return (vfstype); 626 } 627 628 static void 629 usage() 630 { 631 632 (void)fprintf(stderr, 633 "usage: mount %s\n mount %s\n mount %s\n", 634 "[-Aadfruvw] [-t type]", 635 "[-dfruvw] special | node", 636 "[-dfruvw] [-o options] [-t type] special node"); 637 exit(1); 638 /* NOTREACHED */ 639 } 640
Indexes created Tue Sep 30 06:09:59 GMT 2025