mount.c revision 1.61
1 /* $NetBSD: mount.c,v 1.61 2002/09/21 18:43:32 christos 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 1.61 2002/09/21 18:43:32 christos 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 getmntargs __P((struct statfs *, char *, size_t)); 80 static int hasopt __P((const char *, const char *)); 81 static void mangle __P((char *, int *, const char ***, int *)); 82 static int mountfs __P((const char *, const char *, const char *, 83 int, const char *, const char *, int, char *, size_t)); 84 static void prmount __P((struct statfs *)); 85 static void usage __P((void)); 86 87 #ifndef NO_MOUNT_PROGS 88 void checkname __P((int, char *[])); 89 #endif 90 int main __P((int, char *[])); 91 92 /* Map from mount otions to printable formats. */ 93 static const struct opt { 94 int o_opt; 95 int o_silent; 96 const char *o_name; 97 } optnames[] = { 98 __MNT_FLAGS 99 }; 100 101 static char ffs_fstype[] = "ffs"; 102 103 int 104 main(argc, argv) 105 int argc; 106 char *argv[]; 107 { 108 const char *mntfromname, *mntonname, **vfslist, *vfstype; 109 struct fstab *fs; 110 struct statfs *mntbuf; 111 FILE *mountdfp; 112 int all, ch, forceall, i, init_flags, mntsize, rval; 113 char *options; 114 const char *mountopts, *fstypename; 115 116 #ifndef NO_MOUNT_PROGS 117 /* if called as specific mount, call it's main mount routine */ 118 checkname(argc, argv); 119 #endif 120 121 /* started as "mount" */ 122 all = forceall = init_flags = 0; 123 options = NULL; 124 vfslist = NULL; 125 vfstype = ffs_fstype; 126 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 127 switch (ch) { 128 case 'A': 129 all = forceall = 1; 130 break; 131 case 'a': 132 all = 1; 133 break; 134 case 'd': 135 debug = 1; 136 break; 137 case 'f': 138 init_flags |= MNT_FORCE; 139 break; 140 case 'o': 141 if (*optarg) 142 catopt(&options, optarg); 143 break; 144 case 'r': 145 init_flags |= MNT_RDONLY; 146 break; 147 case 't': 148 if (vfslist != NULL) 149 errx(1, 150 "only one -t option may be specified."); 151 vfslist = makevfslist(optarg); 152 vfstype = optarg; 153 break; 154 case 'u': 155 init_flags |= MNT_UPDATE; 156 break; 157 case 'v': 158 verbose++; 159 break; 160 case 'w': 161 init_flags &= ~MNT_RDONLY; 162 break; 163 case '?': 164 default: 165 usage(); 166 /* NOTREACHED */ 167 } 168 argc -= optind; 169 argv += optind; 170 171 #define BADTYPE(type) \ 172 (strcmp(type, FSTAB_RO) && \ 173 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 174 175 rval = 0; 176 switch (argc) { 177 case 0: 178 if (all) 179 while ((fs = getfsent()) != NULL) { 180 if (BADTYPE(fs->fs_type)) 181 continue; 182 if (checkvfsname(fs->fs_vfstype, vfslist)) 183 continue; 184 if (hasopt(fs->fs_mntops, "noauto")) 185 continue; 186 if (mountfs(fs->fs_vfstype, fs->fs_spec, 187 fs->fs_file, init_flags, options, 188 fs->fs_mntops, !forceall, NULL, 0)) 189 rval = 1; 190 } 191 else { 192 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 193 err(1, "getmntinfo"); 194 for (i = 0; i < mntsize; i++) { 195 if (checkvfsname(mntbuf[i].f_fstypename, 196 vfslist)) 197 continue; 198 prmount(&mntbuf[i]); 199 } 200 } 201 exit(rval); 202 /* NOTREACHED */ 203 case 1: 204 if (vfslist != NULL) { 205 usage(); 206 /* NOTREACHED */ 207 } 208 209 if (init_flags & MNT_UPDATE) { 210 if ((mntbuf = getmntpt(*argv)) == NULL) 211 errx(1, 212 "unknown special file or file system %s.", 213 *argv); 214 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 215 mntfromname = fs->fs_spec; 216 /* ignore the fstab file options. */ 217 fs->fs_mntops = NULL; 218 } else 219 mntfromname = mntbuf->f_mntfromname; 220 mntonname = mntbuf->f_mntonname; 221 fstypename = mntbuf->f_fstypename; 222 mountopts = NULL; 223 } else { 224 if ((fs = getfsfile(*argv)) == NULL && 225 (fs = getfsspec(*argv)) == NULL) 226 errx(1, 227 "%s: unknown special file or file system.", 228 *argv); 229 if (BADTYPE(fs->fs_type)) 230 errx(1, "%s has unknown file system type.", 231 *argv); 232 mntfromname = fs->fs_spec; 233 mntonname = fs->fs_file; 234 fstypename = fs->fs_vfstype; 235 mountopts = fs->fs_mntops; 236 } 237 rval = mountfs(fstypename, mntfromname, 238 mntonname, init_flags, options, mountopts, 0, NULL, 0); 239 break; 240 case 2: 241 /* 242 * If -t flag has not been specified, and spec contains either 243 * a ':' or a '@' then assume that an NFS filesystem is being 244 * specified ala Sun. 245 */ 246 if (vfslist == NULL) { 247 if (strpbrk(argv[0], ":@") != NULL) 248 vfstype = "nfs"; 249 else { 250 vfstype = getfslab(argv[0]); 251 if (vfstype == NULL) 252 vfstype = ffs_fstype; 253 } 254 } 255 rval = mountfs(vfstype, 256 argv[0], argv[1], init_flags, options, NULL, 0, NULL, 0); 257 break; 258 default: 259 usage(); 260 /* NOTREACHED */ 261 } 262 263 /* 264 * If the mount was successfully, and done by root, tell mountd the 265 * good news. Pid checks are probably unnecessary, but don't hurt. 266 */ 267 if (rval == 0 && getuid() == 0 && 268 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 269 int pid; 270 271 if (fscanf(mountdfp, "%d", &pid) == 1 && 272 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 273 err(1, "signal mountd"); 274 (void)fclose(mountdfp); 275 } 276 277 exit(rval); 278 /* NOTREACHED */ 279 } 280 281 int 282 hasopt(mntopts, option) 283 const char *mntopts, *option; 284 { 285 int negative, found; 286 char *opt, *optbuf; 287 288 if (option[0] == 'n' && option[1] == 'o') { 289 negative = 1; 290 option += 2; 291 } else 292 negative = 0; 293 optbuf = strdup(mntopts); 294 found = 0; 295 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 296 if (opt[0] == 'n' && opt[1] == 'o') { 297 if (!strcasecmp(opt + 2, option)) 298 found = negative; 299 } else if (!strcasecmp(opt, option)) 300 found = !negative; 301 } 302 free(optbuf); 303 return (found); 304 } 305 306 static int 307 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted, buf, buflen) 308 const char *vfstype, *spec, *name, *options, *mntopts; 309 int flags, skipmounted; 310 char *buf; 311 size_t buflen; 312 { 313 /* List of directories containing mount_xxx subcommands. */ 314 static const char *edirs[] = { 315 #ifdef _PATH_RESCUE 316 _PATH_RESCUE, 317 #endif 318 _PATH_SBIN, 319 _PATH_USRSBIN, 320 NULL 321 }; 322 const char **argv, **edir; 323 struct statfs *sfp, sf; 324 pid_t pid; 325 int pfd[2]; 326 int argc, numfs, i, status, maxargc; 327 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 328 mntpath[MAXPATHLEN]; 329 330 #ifdef __GNUC__ 331 (void) &name; 332 (void) &optbuf; 333 (void) &vfstype; 334 #endif 335 336 if (realpath(name, mntpath) == NULL) { 337 warn("realpath %s", name); 338 return (1); 339 } 340 341 name = mntpath; 342 343 optbuf = NULL; 344 if (mntopts) 345 catopt(&optbuf, mntopts); 346 if (options) 347 catopt(&optbuf, options); 348 if (!mntopts && !options) 349 catopt(&optbuf, "rw"); 350 351 if (!strcmp(name, "/")) 352 flags |= MNT_UPDATE; 353 else if (skipmounted) { 354 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 355 warn("getmntinfo"); 356 return (1); 357 } 358 for(i = 0; i < numfs; i++) { 359 /* 360 * XXX can't check f_mntfromname, 361 * thanks to mfs, union, etc. 362 */ 363 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 364 strncmp(vfstype, sfp[i].f_fstypename, 365 MFSNAMELEN) == 0) { 366 if (verbose) 367 (void)printf("%s on %s type %.*s: " 368 "%s\n", 369 sfp[i].f_mntfromname, 370 sfp[i].f_mntonname, 371 MFSNAMELEN, 372 sfp[i].f_fstypename, 373 "already mounted"); 374 return (0); 375 } 376 } 377 } 378 if (flags & MNT_FORCE) 379 catopt(&optbuf, "force"); 380 if (flags & MNT_RDONLY) 381 catopt(&optbuf, "ro"); 382 383 if (flags & MNT_UPDATE) { 384 catopt(&optbuf, "update"); 385 /* Figure out the fstype only if we defaulted to ffs */ 386 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 387 vfstype = sf.f_fstypename; 388 } 389 390 maxargc = 64; 391 argv = malloc(sizeof(char *) * maxargc); 392 393 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 394 argc = 0; 395 argv[argc++] = execbase; 396 if (optbuf) 397 mangle(optbuf, &argc, &argv, &maxargc); 398 argv[argc++] = spec; 399 argv[argc++] = name; 400 argv[argc] = NULL; 401 402 if (verbose && buf == NULL) { 403 (void)printf("exec:"); 404 for (i = 0; i < argc; i++) 405 (void)printf(" %s", argv[i]); 406 (void)printf("\n"); 407 } 408 409 if (buf) { 410 if (pipe(pfd) == -1) 411 warn("Cannot create pipe"); 412 } 413 414 switch (pid = vfork()) { 415 case -1: /* Error. */ 416 warn("vfork"); 417 if (optbuf) 418 free(optbuf); 419 return (1); 420 421 case 0: /* Child. */ 422 if (debug) 423 _exit(0); 424 425 if (buf) { 426 (void)close(pfd[0]); 427 (void)close(STDOUT_FILENO); 428 if (dup2(pfd[1], STDOUT_FILENO) == -1) 429 warn("Cannot open fd to mount program"); 430 } 431 432 /* Go find an executable. */ 433 edir = edirs; 434 do { 435 (void)snprintf(execname, 436 sizeof(execname), "%s/%s", *edir, execbase); 437 (void)execv(execname, (char * const *)argv); 438 if (errno != ENOENT) 439 warn("exec %s for %s", execname, name); 440 } while (*++edir != NULL); 441 442 if (errno == ENOENT) 443 warnx("%s not found for %s", execbase, name); 444 _exit(1); 445 /* NOTREACHED */ 446 447 default: /* Parent. */ 448 if (optbuf) 449 free(optbuf); 450 451 if (buf || strstr(options, "getargs") != NULL) { 452 char tbuf[1024], *ptr; 453 int nread; 454 if (buf == NULL) { 455 ptr = tbuf; 456 buflen = sizeof(tbuf) - 1; 457 } else { 458 ptr = buf; 459 buflen--; 460 } 461 (void)close(pfd[1]); 462 (void)signal(SIGPIPE, SIG_IGN); 463 while ((nread = read(pfd[0], ptr, buflen)) > 0) { 464 buflen -= nread; 465 ptr += nread; 466 } 467 *ptr = '\0'; 468 if (buflen == 0) { 469 while (read(pfd[0], &nread, sizeof(nread)) > 0) 470 continue; 471 } 472 if (buf == NULL) 473 (void)fprintf(stdout, "%s", tbuf); 474 } 475 476 if (waitpid(pid, &status, 0) < 0) { 477 warn("waitpid"); 478 return (1); 479 } 480 481 if (WIFEXITED(status)) { 482 if (WEXITSTATUS(status) != 0) 483 return (WEXITSTATUS(status)); 484 } else if (WIFSIGNALED(status)) { 485 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 486 return (1); 487 } 488 489 if (buf == NULL) { 490 if (verbose) { 491 if (statfs(name, &sf) < 0) { 492 warn("statfs %s", name); 493 return (1); 494 } 495 prmount(&sf); 496 } 497 } 498 break; 499 } 500 501 return (0); 502 } 503 504 static void 505 prmount(sfp) 506 struct statfs *sfp; 507 { 508 int flags; 509 const struct opt *o; 510 struct passwd *pw; 511 int f; 512 513 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, 514 sfp->f_mntonname, MFSNAMELEN, sfp->f_fstypename); 515 516 flags = sfp->f_flags & MNT_VISFLAGMASK; 517 for (f = 0, o = optnames; flags && o < 518 &optnames[sizeof(optnames)/sizeof(optnames[0])]; o++) 519 if (flags & o->o_opt) { 520 if (!o->o_silent || verbose) 521 (void)printf("%s%s", !f++ ? " (" : ", ", 522 o->o_name); 523 flags &= ~o->o_opt; 524 } 525 if (flags) 526 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 527 flags & (flags - 1) ? "s" : "", flags); 528 if (sfp->f_owner) { 529 (void)printf("%smounted by ", !f++ ? " (" : ", "); 530 if ((pw = getpwuid(sfp->f_owner)) != NULL) 531 (void)printf("%s", pw->pw_name); 532 else 533 (void)printf("%d", sfp->f_owner); 534 } 535 if (verbose) { 536 (void)printf("%swrites: sync %ld async %ld", 537 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 538 if (verbose > 1) { 539 char buf[2048]; 540 if (getmntargs(sfp, buf, sizeof(buf))) 541 printf(", [%s: %s])\n", sfp->f_fstypename, buf); 542 else 543 printf(")\n"); 544 } 545 } else 546 (void)printf("%s", f ? ")\n" : "\n"); 547 } 548 549 static int 550 getmntargs(sfs, buf, buflen) 551 struct statfs *sfs; 552 char *buf; 553 size_t buflen; 554 { 555 if (mountfs(sfs->f_fstypename, sfs->f_mntfromname, sfs->f_mntonname, 0, 556 "getargs", NULL, 0, buf, buflen)) 557 return 0; 558 else { 559 if (*buf == '\0') 560 return 0; 561 if ((buf = strchr(buf, '\n')) != NULL) 562 *buf = '\0'; 563 return 1; 564 } 565 } 566 567 static struct statfs * 568 getmntpt(name) 569 const char *name; 570 { 571 struct statfs *mntbuf; 572 int i, mntsize; 573 574 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 575 for (i = 0; i < mntsize; i++) 576 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 577 strcmp(mntbuf[i].f_mntonname, name) == 0) 578 return (&mntbuf[i]); 579 return (NULL); 580 } 581 582 static void 583 catopt(sp, o) 584 char **sp; 585 const char *o; 586 { 587 char *s; 588 size_t i, j; 589 590 s = *sp; 591 if (s) { 592 i = strlen(s); 593 j = i + 1 + strlen(o) + 1; 594 s = realloc(s, j); 595 (void)snprintf(s + i, j, ",%s", o); 596 } else 597 s = strdup(o); 598 *sp = s; 599 } 600 601 static void 602 mangle(options, argcp, argvp, maxargcp) 603 char *options; 604 int *argcp, *maxargcp; 605 const char ***argvp; 606 { 607 char *p, *s; 608 int argc, maxargc; 609 const char **argv; 610 611 argc = *argcp; 612 argv = *argvp; 613 maxargc = *maxargcp; 614 615 for (s = options; (p = strsep(&s, ",")) != NULL;) { 616 /* Always leave space for one more argument and the NULL. */ 617 if (argc >= maxargc - 4) { 618 maxargc <<= 1; 619 argv = realloc(argv, maxargc * sizeof(char *)); 620 } 621 if (*p != '\0') { 622 if (*p == '-') { 623 argv[argc++] = p; 624 p = strchr(p, '='); 625 if (p) { 626 *p = '\0'; 627 argv[argc++] = p+1; 628 } 629 } else if (strcmp(p, "rw") != 0) { 630 argv[argc++] = "-o"; 631 argv[argc++] = p; 632 } 633 } 634 } 635 636 *argcp = argc; 637 *argvp = argv; 638 *maxargcp = maxargc; 639 } 640 641 /* Deduce the filesystem type from the disk label. */ 642 static const char * 643 getfslab(str) 644 const char *str; 645 { 646 struct disklabel dl; 647 int fd; 648 int part; 649 const char *vfstype; 650 u_char fstype; 651 char buf[MAXPATHLEN + 1]; 652 char *sp, *ep; 653 654 if ((fd = open(str, O_RDONLY)) == -1) { 655 /* 656 * Iff we get EBUSY try the raw device. Since mount always uses 657 * the block device we know we are never passed a raw device. 658 */ 659 if (errno != EBUSY) 660 err(1, "cannot open `%s'", str); 661 strlcpy(buf, str, MAXPATHLEN); 662 if ((sp = strrchr(buf, '/')) != NULL) 663 ++sp; 664 else 665 sp = buf; 666 for (ep = sp + strlen(sp) + 1; ep > sp; ep--) 667 *ep = *(ep - 1); 668 *sp = 'r'; 669 670 /* Silently fail here - mount call can display error */ 671 if ((fd = open(buf, O_RDONLY)) == -1) 672 return (NULL); 673 } 674 675 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 676 (void) close(fd); 677 return (NULL); 678 } 679 680 (void) close(fd); 681 682 part = str[strlen(str) - 1] - 'a'; 683 684 if (part < 0 || part >= dl.d_npartitions) 685 return (NULL); 686 687 /* Return NULL for unknown types - caller can fall back to ffs */ 688 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 689 vfstype = NULL; 690 else 691 vfstype = mountnames[fstype]; 692 693 return (vfstype); 694 } 695 696 static void 697 usage() 698 { 699 700 (void)fprintf(stderr, 701 "usage: mount %s\n mount %s\n mount %s\n", 702 "[-Aadfruvw] [-t type]", 703 "[-dfruvw] special | node", 704 "[-dfruvw] [-o options] [-t type] special node"); 705 exit(1); 706 /* NOTREACHED */ 707 } 708
Indexes created Wed Oct 01 13:09:50 GMT 2025