mount.c revision 1.65
1 /* $NetBSD: mount.c,v 1.65 2003/01/19 10:49:12 jdolecek 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 1.65 2003/01/19 10:49:12 jdolecek 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 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_FLAGS 96 }; 97 98 static char ffs_fstype[] = "ffs"; 99 100 int 101 main(argc, argv) 102 int argc; 103 char *argv[]; 104 { 105 const char *mntfromname, *mntonname, **vfslist, *vfstype; 106 struct fstab *fs; 107 struct statfs *mntbuf; 108 FILE *mountdfp; 109 int all, ch, forceall, i, init_flags, mntsize, rval; 110 char *options; 111 const char *mountopts, *fstypename; 112 113 /* started as "mount" */ 114 all = forceall = init_flags = 0; 115 options = NULL; 116 vfslist = NULL; 117 vfstype = ffs_fstype; 118 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 119 switch (ch) { 120 case 'A': 121 all = forceall = 1; 122 break; 123 case 'a': 124 all = 1; 125 break; 126 case 'd': 127 debug = 1; 128 break; 129 case 'f': 130 init_flags |= MNT_FORCE; 131 break; 132 case 'o': 133 if (*optarg) 134 catopt(&options, optarg); 135 break; 136 case 'r': 137 init_flags |= MNT_RDONLY; 138 break; 139 case 't': 140 if (vfslist != NULL) 141 errx(1, 142 "only one -t option may be specified."); 143 vfslist = makevfslist(optarg); 144 vfstype = optarg; 145 break; 146 case 'u': 147 init_flags |= MNT_UPDATE; 148 break; 149 case 'v': 150 verbose++; 151 break; 152 case 'w': 153 init_flags &= ~MNT_RDONLY; 154 break; 155 case '?': 156 default: 157 usage(); 158 /* NOTREACHED */ 159 } 160 argc -= optind; 161 argv += optind; 162 163 #define BADTYPE(type) \ 164 (strcmp(type, FSTAB_RO) && \ 165 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 166 167 rval = 0; 168 switch (argc) { 169 case 0: 170 if (all) 171 while ((fs = getfsent()) != NULL) { 172 if (BADTYPE(fs->fs_type)) 173 continue; 174 if (checkvfsname(fs->fs_vfstype, vfslist)) 175 continue; 176 if (hasopt(fs->fs_mntops, "noauto")) 177 continue; 178 if (mountfs(fs->fs_vfstype, fs->fs_spec, 179 fs->fs_file, init_flags, options, 180 fs->fs_mntops, !forceall, NULL, 0)) 181 rval = 1; 182 } 183 else { 184 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 185 err(1, "getmntinfo"); 186 for (i = 0; i < mntsize; i++) { 187 if (checkvfsname(mntbuf[i].f_fstypename, 188 vfslist)) 189 continue; 190 prmount(&mntbuf[i]); 191 } 192 } 193 exit(rval); 194 /* NOTREACHED */ 195 case 1: 196 if (vfslist != NULL) { 197 usage(); 198 /* NOTREACHED */ 199 } 200 201 if (init_flags & MNT_UPDATE) { 202 if ((mntbuf = getmntpt(*argv)) == NULL) 203 errx(1, 204 "unknown special file or file system %s.", 205 *argv); 206 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 207 mntfromname = fs->fs_spec; 208 /* ignore the fstab file options. */ 209 fs->fs_mntops = NULL; 210 } else 211 mntfromname = mntbuf->f_mntfromname; 212 mntonname = mntbuf->f_mntonname; 213 fstypename = mntbuf->f_fstypename; 214 mountopts = NULL; 215 } else { 216 if ((fs = getfsfile(*argv)) == NULL && 217 (fs = getfsspec(*argv)) == NULL) 218 errx(1, 219 "%s: unknown special file or file system.", 220 *argv); 221 if (BADTYPE(fs->fs_type)) 222 errx(1, "%s has unknown file system type.", 223 *argv); 224 mntfromname = fs->fs_spec; 225 mntonname = fs->fs_file; 226 fstypename = fs->fs_vfstype; 227 mountopts = fs->fs_mntops; 228 } 229 rval = mountfs(fstypename, mntfromname, 230 mntonname, init_flags, options, mountopts, 0, NULL, 0); 231 break; 232 case 2: 233 /* 234 * If -t flag has not been specified, and spec contains either 235 * a ':' or a '@' then assume that an NFS filesystem is being 236 * specified ala Sun. 237 */ 238 if (vfslist == NULL) { 239 if (strpbrk(argv[0], ":@") != NULL) 240 vfstype = "nfs"; 241 else { 242 vfstype = getfslab(argv[0]); 243 if (vfstype == NULL) 244 vfstype = ffs_fstype; 245 } 246 } 247 rval = mountfs(vfstype, 248 argv[0], argv[1], init_flags, options, NULL, 0, NULL, 0); 249 break; 250 default: 251 usage(); 252 /* NOTREACHED */ 253 } 254 255 /* 256 * If the mount was successfully, and done by root, tell mountd the 257 * good news. Pid checks are probably unnecessary, but don't hurt. 258 */ 259 if (rval == 0 && getuid() == 0 && 260 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 261 int pid; 262 263 if (fscanf(mountdfp, "%d", &pid) == 1 && 264 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 265 err(1, "signal mountd"); 266 (void)fclose(mountdfp); 267 } 268 269 exit(rval); 270 /* NOTREACHED */ 271 } 272 273 int 274 hasopt(mntopts, option) 275 const char *mntopts, *option; 276 { 277 int negative, found; 278 char *opt, *optbuf; 279 280 if (option[0] == 'n' && option[1] == 'o') { 281 negative = 1; 282 option += 2; 283 } else 284 negative = 0; 285 optbuf = strdup(mntopts); 286 found = 0; 287 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 288 if (opt[0] == 'n' && opt[1] == 'o') { 289 if (!strcasecmp(opt + 2, option)) 290 found = negative; 291 } else if (!strcasecmp(opt, option)) 292 found = !negative; 293 } 294 free(optbuf); 295 return (found); 296 } 297 298 static int 299 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted, buf, buflen) 300 const char *vfstype, *spec, *name, *options, *mntopts; 301 int flags, skipmounted; 302 char *buf; 303 size_t buflen; 304 { 305 /* List of directories containing mount_xxx subcommands. */ 306 static const char *edirs[] = { 307 #ifdef _PATH_RESCUE 308 _PATH_RESCUE, 309 #endif 310 _PATH_SBIN, 311 _PATH_USRSBIN, 312 NULL 313 }; 314 const char **argv, **edir; 315 struct statfs *sfp, sf; 316 pid_t pid; 317 int pfd[2]; 318 int argc, numfs, i, status, maxargc; 319 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 320 mntpath[MAXPATHLEN]; 321 322 #ifdef __GNUC__ 323 (void) &name; 324 (void) &optbuf; 325 (void) &vfstype; 326 #endif 327 328 if (realpath(name, mntpath) == NULL) { 329 warn("realpath %s", name); 330 return (1); 331 } 332 333 name = mntpath; 334 335 optbuf = NULL; 336 if (mntopts) 337 catopt(&optbuf, mntopts); 338 if (options) 339 catopt(&optbuf, options); 340 if (!mntopts && !options) 341 catopt(&optbuf, "rw"); 342 343 if (!strcmp(name, "/")) 344 flags |= MNT_UPDATE; 345 else if (skipmounted) { 346 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 347 warn("getmntinfo"); 348 return (1); 349 } 350 for(i = 0; i < numfs; i++) { 351 /* 352 * XXX can't check f_mntfromname, 353 * thanks to mfs, union, etc. 354 */ 355 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 356 strncmp(vfstype, sfp[i].f_fstypename, 357 MFSNAMELEN) == 0) { 358 if (verbose) 359 (void)printf("%s on %s type %.*s: " 360 "%s\n", 361 sfp[i].f_mntfromname, 362 sfp[i].f_mntonname, 363 MFSNAMELEN, 364 sfp[i].f_fstypename, 365 "already mounted"); 366 return (0); 367 } 368 } 369 } 370 if (flags & MNT_FORCE) 371 catopt(&optbuf, "force"); 372 if (flags & MNT_RDONLY) 373 catopt(&optbuf, "ro"); 374 375 if (flags & MNT_UPDATE) { 376 catopt(&optbuf, "update"); 377 /* Figure out the fstype only if we defaulted to ffs */ 378 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 379 vfstype = sf.f_fstypename; 380 } 381 382 maxargc = 64; 383 argv = malloc(sizeof(char *) * maxargc); 384 385 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 386 argc = 0; 387 argv[argc++] = execbase; 388 if (optbuf) 389 mangle(optbuf, &argc, &argv, &maxargc); 390 argv[argc++] = spec; 391 argv[argc++] = name; 392 argv[argc] = NULL; 393 394 if (verbose && buf == NULL) { 395 (void)printf("exec:"); 396 for (i = 0; i < argc; i++) 397 (void)printf(" %s", argv[i]); 398 (void)printf("\n"); 399 } 400 401 if (buf) { 402 if (pipe(pfd) == -1) 403 warn("Cannot create pipe"); 404 } 405 406 switch (pid = vfork()) { 407 case -1: /* Error. */ 408 warn("vfork"); 409 if (optbuf) 410 free(optbuf); 411 return (1); 412 413 case 0: /* Child. */ 414 if (debug) 415 _exit(0); 416 417 if (buf) { 418 (void)close(pfd[0]); 419 (void)close(STDOUT_FILENO); 420 if (dup2(pfd[1], STDOUT_FILENO) == -1) 421 warn("Cannot open fd to mount program"); 422 } 423 424 /* Go find an executable. */ 425 edir = edirs; 426 do { 427 (void)snprintf(execname, 428 sizeof(execname), "%s/%s", *edir, execbase); 429 (void)execv(execname, (char * const *)argv); 430 if (errno != ENOENT) 431 warn("exec %s for %s", execname, name); 432 } while (*++edir != NULL); 433 434 if (errno == ENOENT) 435 warnx("%s not found for %s", execbase, name); 436 _exit(1); 437 /* NOTREACHED */ 438 439 default: /* Parent. */ 440 if (optbuf) 441 free(optbuf); 442 443 if (buf || (options != NULL && 444 strstr(options, "getargs") != NULL)) { 445 char tbuf[1024], *ptr; 446 int nread; 447 448 if (buf == NULL) { 449 ptr = tbuf; 450 buflen = sizeof(tbuf) - 1; 451 } else { 452 ptr = buf; 453 buflen--; 454 } 455 (void)close(pfd[1]); 456 (void)signal(SIGPIPE, SIG_IGN); 457 while ((nread = read(pfd[0], ptr, buflen)) > 0) { 458 buflen -= nread; 459 ptr += nread; 460 } 461 *ptr = '\0'; 462 if (buflen == 0) { 463 while (read(pfd[0], &nread, sizeof(nread)) > 0) 464 continue; 465 } 466 if (buf == NULL) 467 (void)fprintf(stdout, "%s", tbuf); 468 } 469 470 if (waitpid(pid, &status, 0) < 0) { 471 warn("waitpid"); 472 return (1); 473 } 474 475 if (WIFEXITED(status)) { 476 if (WEXITSTATUS(status) != 0) 477 return (WEXITSTATUS(status)); 478 } else if (WIFSIGNALED(status)) { 479 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 480 return (1); 481 } 482 483 if (buf == NULL) { 484 if (verbose) { 485 if (statfs(name, &sf) < 0) { 486 warn("statfs %s", name); 487 return (1); 488 } 489 prmount(&sf); 490 } 491 } 492 break; 493 } 494 495 return (0); 496 } 497 498 static void 499 prmount(sfp) 500 struct statfs *sfp; 501 { 502 int flags; 503 const struct opt *o; 504 struct passwd *pw; 505 int f; 506 507 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, 508 sfp->f_mntonname, MFSNAMELEN, sfp->f_fstypename); 509 510 flags = sfp->f_flags & MNT_VISFLAGMASK; 511 for (f = 0, o = optnames; flags && o < 512 &optnames[sizeof(optnames)/sizeof(optnames[0])]; o++) 513 if (flags & o->o_opt) { 514 if (!o->o_silent || verbose) 515 (void)printf("%s%s", !f++ ? " (" : ", ", 516 o->o_name); 517 flags &= ~o->o_opt; 518 } 519 if (flags) 520 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 521 flags & (flags - 1) ? "s" : "", flags); 522 if (sfp->f_owner) { 523 (void)printf("%smounted by ", !f++ ? " (" : ", "); 524 if ((pw = getpwuid(sfp->f_owner)) != NULL) 525 (void)printf("%s", pw->pw_name); 526 else 527 (void)printf("%d", sfp->f_owner); 528 } 529 if (verbose) { 530 (void)printf("%swrites: sync %ld async %ld", 531 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 532 if (verbose > 1) { 533 char buf[2048]; 534 535 if (getmntargs(sfp, buf, sizeof(buf))) 536 printf(", [%s: %s]", sfp->f_fstypename, buf); 537 } 538 printf(")\n"); 539 } else 540 (void)printf("%s", f ? ")\n" : "\n"); 541 } 542 543 static int 544 getmntargs(sfs, buf, buflen) 545 struct statfs *sfs; 546 char *buf; 547 size_t buflen; 548 { 549 550 if (mountfs(sfs->f_fstypename, sfs->f_mntfromname, sfs->f_mntonname, 0, 551 "getargs", NULL, 0, buf, buflen)) 552 return (0); 553 else { 554 if (*buf == '\0') 555 return (0); 556 if ((buf = strchr(buf, '\n')) != NULL) 557 *buf = '\0'; 558 return (1); 559 } 560 } 561 562 static struct statfs * 563 getmntpt(name) 564 const char *name; 565 { 566 struct statfs *mntbuf; 567 int i, mntsize; 568 569 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 570 for (i = 0; i < mntsize; i++) 571 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 572 strcmp(mntbuf[i].f_mntonname, name) == 0) 573 return (&mntbuf[i]); 574 return (NULL); 575 } 576 577 static void 578 catopt(sp, o) 579 char **sp; 580 const char *o; 581 { 582 char *s; 583 size_t i, j; 584 585 s = *sp; 586 if (s) { 587 i = strlen(s); 588 j = i + 1 + strlen(o) + 1; 589 s = realloc(s, j); 590 (void)snprintf(s + i, j, ",%s", o); 591 } else 592 s = strdup(o); 593 *sp = s; 594 } 595 596 static void 597 mangle(options, argcp, argvp, maxargcp) 598 char *options; 599 int *argcp, *maxargcp; 600 const char ***argvp; 601 { 602 char *p, *s; 603 int argc, maxargc; 604 const char **argv; 605 606 argc = *argcp; 607 argv = *argvp; 608 maxargc = *maxargcp; 609 610 for (s = options; (p = strsep(&s, ",")) != NULL;) { 611 /* Always leave space for one more argument and the NULL. */ 612 if (argc >= maxargc - 4) { 613 maxargc <<= 1; 614 argv = realloc(argv, maxargc * sizeof(char *)); 615 } 616 if (*p != '\0') { 617 if (*p == '-') { 618 argv[argc++] = p; 619 p = strchr(p, '='); 620 if (p) { 621 *p = '\0'; 622 argv[argc++] = p+1; 623 } 624 } else if (strcmp(p, "rw") != 0) { 625 argv[argc++] = "-o"; 626 argv[argc++] = p; 627 } 628 } 629 } 630 631 *argcp = argc; 632 *argvp = argv; 633 *maxargcp = maxargc; 634 } 635 636 /* Deduce the filesystem type from the disk label. */ 637 static const char * 638 getfslab(str) 639 const char *str; 640 { 641 struct disklabel dl; 642 int fd; 643 int part; 644 const char *vfstype; 645 u_char fstype; 646 char buf[MAXPATHLEN + 1]; 647 char *sp, *ep; 648 649 if ((fd = open(str, O_RDONLY)) == -1) { 650 /* 651 * Iff we get EBUSY try the raw device. Since mount always uses 652 * the block device we know we are never passed a raw device. 653 */ 654 if (errno != EBUSY) 655 err(1, "cannot open `%s'", str); 656 strlcpy(buf, str, MAXPATHLEN); 657 if ((sp = strrchr(buf, '/')) != NULL) 658 ++sp; 659 else 660 sp = buf; 661 for (ep = sp + strlen(sp) + 1; ep > sp; ep--) 662 *ep = *(ep - 1); 663 *sp = 'r'; 664 665 /* Silently fail here - mount call can display error */ 666 if ((fd = open(buf, O_RDONLY)) == -1) 667 return (NULL); 668 } 669 670 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 671 (void) close(fd); 672 return (NULL); 673 } 674 675 (void) close(fd); 676 677 part = str[strlen(str) - 1] - 'a'; 678 679 if (part < 0 || part >= dl.d_npartitions) 680 return (NULL); 681 682 /* Return NULL for unknown types - caller can fall back to ffs */ 683 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 684 vfstype = NULL; 685 else 686 vfstype = mountnames[fstype]; 687 688 return (vfstype); 689 } 690 691 static void 692 usage() 693 { 694 695 (void)fprintf(stderr, 696 "usage: mount %s\n mount %s\n mount %s\n", 697 "[-Aadfruvw] [-t type]", 698 "[-dfruvw] special | node", 699 "[-dfruvw] [-o options] [-t type] special node"); 700 exit(1); 701 /* NOTREACHED */ 702 } 703
Indexes created Sun Oct 19 02:09:48 GMT 2025