mount.c revision 1.69
1 /* $NetBSD: mount.c,v 1.69 2004/04/21 01:05:33 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95"; 41 #else 42 __RCSID("$NetBSD: mount.c,v 1.69 2004/04/21 01:05:33 christos Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/mount.h> 48 #include <sys/wait.h> 49 50 #include <err.h> 51 #include <errno.h> 52 #include <fstab.h> 53 #include <pwd.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #define MOUNTNAMES 61 #include <fcntl.h> 62 #include <sys/disklabel.h> 63 #include <sys/ioctl.h> 64 65 #include "pathnames.h" 66 #include "vfslist.h" 67 68 static int debug, verbose; 69 70 static void catopt __P((char **, const char *)); 71 static const char * 72 getfslab __P((const char *str)); 73 static struct statvfs * 74 getmntpt __P((const char *)); 75 static int getmntargs __P((struct statvfs *, char *, size_t)); 76 static int hasopt __P((const char *, const char *)); 77 static void mangle __P((char *, int *, const char ***, int *)); 78 static int mountfs __P((const char *, const char *, const char *, 79 int, const char *, const char *, int, char *, size_t)); 80 static void prmount __P((struct statvfs *)); 81 static void usage __P((void)); 82 83 int main __P((int, char *[])); 84 85 /* Map from mount otions to printable formats. */ 86 static const struct opt { 87 int o_opt; 88 int o_silent; 89 const char *o_name; 90 } optnames[] = { 91 __MNT_FLAGS 92 }; 93 94 static char ffs_fstype[] = "ffs"; 95 96 int 97 main(argc, argv) 98 int argc; 99 char *argv[]; 100 { 101 const char *mntfromname, *mntonname, **vfslist, *vfstype; 102 struct fstab *fs; 103 struct statvfs *mntbuf; 104 FILE *mountdfp; 105 int all, ch, forceall, i, init_flags, mntsize, rval; 106 char *options; 107 const char *mountopts, *fstypename; 108 109 /* started as "mount" */ 110 all = forceall = init_flags = 0; 111 options = NULL; 112 vfslist = NULL; 113 vfstype = ffs_fstype; 114 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 115 switch (ch) { 116 case 'A': 117 all = forceall = 1; 118 break; 119 case 'a': 120 all = 1; 121 break; 122 case 'd': 123 debug = 1; 124 break; 125 case 'f': 126 init_flags |= MNT_FORCE; 127 break; 128 case 'o': 129 if (*optarg) 130 catopt(&options, optarg); 131 break; 132 case 'r': 133 init_flags |= MNT_RDONLY; 134 break; 135 case 't': 136 if (vfslist != NULL) 137 errx(1, 138 "only one -t option may be specified."); 139 vfslist = makevfslist(optarg); 140 vfstype = optarg; 141 break; 142 case 'u': 143 init_flags |= MNT_UPDATE; 144 break; 145 case 'v': 146 verbose++; 147 break; 148 case 'w': 149 init_flags &= ~MNT_RDONLY; 150 break; 151 case '?': 152 default: 153 usage(); 154 /* NOTREACHED */ 155 } 156 argc -= optind; 157 argv += optind; 158 159 #define BADTYPE(type) \ 160 (strcmp(type, FSTAB_RO) && \ 161 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 162 163 rval = 0; 164 switch (argc) { 165 case 0: 166 if (all) 167 while ((fs = getfsent()) != NULL) { 168 if (BADTYPE(fs->fs_type)) 169 continue; 170 if (checkvfsname(fs->fs_vfstype, vfslist)) 171 continue; 172 if (hasopt(fs->fs_mntops, "noauto")) 173 continue; 174 if (strcmp(fs->fs_spec, "from_mount") == 0) { 175 if ((mntbuf = getmntpt(fs->fs_file)) == NULL) 176 errx(1, 177 "unknown file system %s.", 178 fs->fs_file); 179 mntfromname = mntbuf->f_mntfromname; 180 } else 181 mntfromname = fs->fs_spec; 182 if (mountfs(fs->fs_vfstype, mntfromname, 183 fs->fs_file, init_flags, options, 184 fs->fs_mntops, !forceall, NULL, 0)) 185 rval = 1; 186 } 187 else { 188 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 189 err(1, "getmntinfo"); 190 for (i = 0; i < mntsize; i++) { 191 if (checkvfsname(mntbuf[i].f_fstypename, 192 vfslist)) 193 continue; 194 prmount(&mntbuf[i]); 195 } 196 } 197 exit(rval); 198 /* NOTREACHED */ 199 case 1: 200 if (vfslist != NULL) { 201 usage(); 202 /* NOTREACHED */ 203 } 204 205 if (init_flags & MNT_UPDATE) { 206 if ((mntbuf = getmntpt(*argv)) == NULL) 207 errx(1, 208 "unknown special file or file system %s.", 209 *argv); 210 mntfromname = mntbuf->f_mntfromname; 211 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 212 if (strcmp(fs->fs_spec, "from_mount") != 0) 213 mntfromname = fs->fs_spec; 214 /* ignore the fstab file options. */ 215 fs->fs_mntops = NULL; 216 } 217 mntonname = mntbuf->f_mntonname; 218 fstypename = mntbuf->f_fstypename; 219 mountopts = NULL; 220 } else { 221 if ((fs = getfsfile(*argv)) == NULL && 222 (fs = getfsspec(*argv)) == NULL) 223 errx(1, 224 "%s: unknown special file or file system.", 225 *argv); 226 if (BADTYPE(fs->fs_type)) 227 errx(1, "%s has unknown file system type.", 228 *argv); 229 if (strcmp(fs->fs_spec, "from_mount") == 0) { 230 if ((mntbuf = getmntpt(*argv)) == NULL) 231 errx(1, 232 "unknown special file or file system %s.", 233 *argv); 234 mntfromname = mntbuf->f_mntfromname; 235 } else 236 mntfromname = fs->fs_spec; 237 mntonname = fs->fs_file; 238 fstypename = fs->fs_vfstype; 239 mountopts = fs->fs_mntops; 240 } 241 rval = mountfs(fstypename, mntfromname, 242 mntonname, init_flags, options, mountopts, 0, NULL, 0); 243 break; 244 case 2: 245 /* 246 * If -t flag has not been specified, and spec contains either 247 * a ':' or a '@' then assume that an NFS filesystem is being 248 * specified ala Sun. 249 */ 250 if (vfslist == NULL) { 251 if (strpbrk(argv[0], ":@") != NULL) 252 vfstype = "nfs"; 253 else { 254 vfstype = getfslab(argv[0]); 255 if (vfstype == NULL) 256 vfstype = ffs_fstype; 257 } 258 } 259 rval = mountfs(vfstype, 260 argv[0], argv[1], init_flags, options, NULL, 0, NULL, 0); 261 break; 262 default: 263 usage(); 264 /* NOTREACHED */ 265 } 266 267 /* 268 * If the mount was successfully, and done by root, tell mountd the 269 * good news. Pid checks are probably unnecessary, but don't hurt. 270 */ 271 if (rval == 0 && getuid() == 0 && 272 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 273 int pid; 274 275 if (fscanf(mountdfp, "%d", &pid) == 1 && 276 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 277 err(1, "signal mountd"); 278 (void)fclose(mountdfp); 279 } 280 281 exit(rval); 282 /* NOTREACHED */ 283 } 284 285 int 286 hasopt(mntopts, option) 287 const char *mntopts, *option; 288 { 289 int negative, found; 290 char *opt, *optbuf; 291 292 if (option[0] == 'n' && option[1] == 'o') { 293 negative = 1; 294 option += 2; 295 } else 296 negative = 0; 297 optbuf = strdup(mntopts); 298 found = 0; 299 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 300 if (opt[0] == 'n' && opt[1] == 'o') { 301 if (!strcasecmp(opt + 2, option)) 302 found = negative; 303 } else if (!strcasecmp(opt, option)) 304 found = !negative; 305 } 306 free(optbuf); 307 return (found); 308 } 309 310 static int 311 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted, buf, buflen) 312 const char *vfstype, *spec, *name, *options, *mntopts; 313 int flags, skipmounted; 314 char *buf; 315 size_t buflen; 316 { 317 /* List of directories containing mount_xxx subcommands. */ 318 static const char *edirs[] = { 319 #ifdef _PATH_RESCUE 320 _PATH_RESCUE, 321 #endif 322 _PATH_SBIN, 323 _PATH_USRSBIN, 324 NULL 325 }; 326 const char **argv, **edir; 327 struct statvfs *sfp, sf; 328 pid_t pid; 329 int pfd[2]; 330 int argc, numfs, i, status, maxargc; 331 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 332 mntpath[MAXPATHLEN]; 333 334 #ifdef __GNUC__ 335 (void) &name; 336 (void) &optbuf; 337 (void) &vfstype; 338 #endif 339 340 if (realpath(name, mntpath) == NULL) { 341 warn("realpath %s", name); 342 return (1); 343 } 344 345 name = mntpath; 346 347 optbuf = NULL; 348 if (mntopts) 349 catopt(&optbuf, mntopts); 350 if (options) 351 catopt(&optbuf, options); 352 if (!mntopts && !options) 353 catopt(&optbuf, "rw"); 354 355 if (!strcmp(name, "/")) 356 flags |= MNT_UPDATE; 357 else if (skipmounted) { 358 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 359 warn("getmntinfo"); 360 return (1); 361 } 362 for(i = 0; i < numfs; i++) { 363 /* 364 * XXX can't check f_mntfromname, 365 * thanks to mfs, union, etc. 366 */ 367 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 368 strncmp(vfstype, sfp[i].f_fstypename, 369 MFSNAMELEN) == 0) { 370 if (verbose) 371 (void)printf("%s on %s type %.*s: " 372 "%s\n", 373 sfp[i].f_mntfromname, 374 sfp[i].f_mntonname, 375 MFSNAMELEN, 376 sfp[i].f_fstypename, 377 "already mounted"); 378 return (0); 379 } 380 } 381 } 382 if (flags & MNT_FORCE) 383 catopt(&optbuf, "force"); 384 if (flags & MNT_RDONLY) 385 catopt(&optbuf, "ro"); 386 387 if (flags & MNT_UPDATE) { 388 catopt(&optbuf, "update"); 389 /* Figure out the fstype only if we defaulted to ffs */ 390 if (vfstype == ffs_fstype && statvfs(name, &sf) != -1) 391 vfstype = sf.f_fstypename; 392 } 393 394 maxargc = 64; 395 argv = malloc(sizeof(char *) * maxargc); 396 397 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 398 argc = 0; 399 argv[argc++] = execbase; 400 if (optbuf) 401 mangle(optbuf, &argc, &argv, &maxargc); 402 argv[argc++] = spec; 403 argv[argc++] = name; 404 argv[argc] = NULL; 405 406 if (verbose && buf == NULL) { 407 (void)printf("exec:"); 408 for (i = 0; i < argc; i++) 409 (void)printf(" %s", argv[i]); 410 (void)printf("\n"); 411 } 412 413 if (buf) { 414 if (pipe(pfd) == -1) 415 warn("Cannot create pipe"); 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 if (buf) { 430 (void)close(pfd[0]); 431 (void)close(STDOUT_FILENO); 432 if (dup2(pfd[1], STDOUT_FILENO) == -1) 433 warn("Cannot open fd to mount program"); 434 } 435 436 /* Go find an executable. */ 437 edir = edirs; 438 do { 439 (void)snprintf(execname, 440 sizeof(execname), "%s/%s", *edir, execbase); 441 (void)execv(execname, (char * const *)argv); 442 if (errno != ENOENT) 443 warn("exec %s for %s", execname, name); 444 } while (*++edir != NULL); 445 446 if (errno == ENOENT) 447 warnx("%s not found for %s", execbase, name); 448 _exit(1); 449 /* NOTREACHED */ 450 451 default: /* Parent. */ 452 if (optbuf) 453 free(optbuf); 454 455 if (buf || (options != NULL && 456 strstr(options, "getargs") != NULL)) { 457 char tbuf[1024], *ptr; 458 int nread; 459 460 if (buf == NULL) { 461 ptr = tbuf; 462 buflen = sizeof(tbuf) - 1; 463 } else { 464 ptr = buf; 465 buflen--; 466 } 467 (void)close(pfd[1]); 468 (void)signal(SIGPIPE, SIG_IGN); 469 while ((nread = read(pfd[0], ptr, buflen)) > 0) { 470 buflen -= nread; 471 ptr += nread; 472 } 473 *ptr = '\0'; 474 if (buflen == 0) { 475 while (read(pfd[0], &nread, sizeof(nread)) > 0) 476 continue; 477 } 478 if (buf == NULL) 479 (void)fprintf(stdout, "%s", tbuf); 480 } 481 482 if (waitpid(pid, &status, 0) < 0) { 483 warn("waitpid"); 484 return (1); 485 } 486 487 if (WIFEXITED(status)) { 488 if (WEXITSTATUS(status) != 0) 489 return (WEXITSTATUS(status)); 490 } else if (WIFSIGNALED(status)) { 491 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 492 return (1); 493 } 494 495 if (buf == NULL) { 496 if (verbose) { 497 if (statvfs(name, &sf) < 0) { 498 warn("statvfs %s", name); 499 return (1); 500 } 501 prmount(&sf); 502 } 503 } 504 break; 505 } 506 507 return (0); 508 } 509 510 static void 511 prmount(sfp) 512 struct statvfs *sfp; 513 { 514 int flags; 515 const struct opt *o; 516 struct passwd *pw; 517 int f; 518 519 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, 520 sfp->f_mntonname, MFSNAMELEN, sfp->f_fstypename); 521 522 flags = sfp->f_flag & MNT_VISFLAGMASK; 523 for (f = 0, o = optnames; flags && o < 524 &optnames[sizeof(optnames)/sizeof(optnames[0])]; o++) 525 if (flags & o->o_opt) { 526 if (!o->o_silent || verbose) 527 (void)printf("%s%s", !f++ ? " (" : ", ", 528 o->o_name); 529 flags &= ~o->o_opt; 530 } 531 if (flags) 532 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 533 flags & (flags - 1) ? "s" : "", flags); 534 if (sfp->f_owner) { 535 (void)printf("%smounted by ", !f++ ? " (" : ", "); 536 if ((pw = getpwuid(sfp->f_owner)) != NULL) 537 (void)printf("%s", pw->pw_name); 538 else 539 (void)printf("%d", sfp->f_owner); 540 } 541 if (verbose) { 542 (void)printf("%s", !f++ ? " (" : ", "); 543 (void)printf("reads: sync %llu async %llu", 544 sfp->f_syncreads, sfp->f_asyncreads); 545 (void)printf(", writes: sync %llu async %llu", 546 sfp->f_syncwrites, sfp->f_asyncwrites); 547 if (verbose > 1) { 548 char buf[2048]; 549 550 if (getmntargs(sfp, buf, sizeof(buf))) 551 printf(", [%s: %s]", sfp->f_fstypename, buf); 552 } 553 printf(")\n"); 554 } else 555 (void)printf("%s", f ? ")\n" : "\n"); 556 } 557 558 static int 559 getmntargs(sfs, buf, buflen) 560 struct statvfs *sfs; 561 char *buf; 562 size_t buflen; 563 { 564 565 if (mountfs(sfs->f_fstypename, sfs->f_mntfromname, sfs->f_mntonname, 0, 566 "getargs", NULL, 0, buf, buflen)) 567 return (0); 568 else { 569 if (*buf == '\0') 570 return (0); 571 if ((buf = strchr(buf, '\n')) != NULL) 572 *buf = '\0'; 573 return (1); 574 } 575 } 576 577 static struct statvfs * 578 getmntpt(name) 579 const char *name; 580 { 581 struct statvfs *mntbuf; 582 int i, mntsize; 583 584 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 585 for (i = 0; i < mntsize; i++) 586 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 587 strcmp(mntbuf[i].f_mntonname, name) == 0) 588 return (&mntbuf[i]); 589 return (NULL); 590 } 591 592 static void 593 catopt(sp, o) 594 char **sp; 595 const char *o; 596 { 597 char *s, *n; 598 599 s = *sp; 600 if (s) { 601 if (asprintf(&n, "%s,%s", s, o) < 0) 602 err(1, "asprintf"); 603 free(s); 604 s = n; 605 } else 606 s = strdup(o); 607 *sp = s; 608 } 609 610 static void 611 mangle(options, argcp, argvp, maxargcp) 612 char *options; 613 int *argcp, *maxargcp; 614 const char ***argvp; 615 { 616 char *p, *s; 617 int argc, maxargc; 618 const char **argv, **nargv; 619 620 argc = *argcp; 621 argv = *argvp; 622 maxargc = *maxargcp; 623 624 for (s = options; (p = strsep(&s, ",")) != NULL;) { 625 /* Always leave space for one more argument and the NULL. */ 626 if (argc >= maxargc - 4) { 627 nargv = realloc(argv, (maxargc << 1) * sizeof(char *)); 628 if (!nargv) 629 err(1, "realloc"); 630 argv = nargv; 631 maxargc <<= 1; 632 } 633 if (*p != '\0') { 634 if (*p == '-') { 635 argv[argc++] = p; 636 p = strchr(p, '='); 637 if (p) { 638 *p = '\0'; 639 argv[argc++] = p+1; 640 } 641 } else if (strcmp(p, "rw") != 0) { 642 argv[argc++] = "-o"; 643 argv[argc++] = p; 644 } 645 } 646 } 647 648 *argcp = argc; 649 *argvp = argv; 650 *maxargcp = maxargc; 651 } 652 653 /* Deduce the filesystem type from the disk label. */ 654 static const char * 655 getfslab(str) 656 const char *str; 657 { 658 struct disklabel dl; 659 int fd; 660 int part; 661 const char *vfstype; 662 u_char fstype; 663 char buf[MAXPATHLEN + 1]; 664 char *sp, *ep; 665 666 if ((fd = open(str, O_RDONLY)) == -1) { 667 /* 668 * Iff we get EBUSY try the raw device. Since mount always uses 669 * the block device we know we are never passed a raw device. 670 */ 671 if (errno != EBUSY) 672 err(1, "cannot open `%s'", str); 673 strlcpy(buf, str, MAXPATHLEN); 674 if ((sp = strrchr(buf, '/')) != NULL) 675 ++sp; 676 else 677 sp = buf; 678 for (ep = sp + strlen(sp) + 1; ep > sp; ep--) 679 *ep = *(ep - 1); 680 *sp = 'r'; 681 682 /* Silently fail here - mount call can display error */ 683 if ((fd = open(buf, O_RDONLY)) == -1) 684 return (NULL); 685 } 686 687 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 688 (void) close(fd); 689 return (NULL); 690 } 691 692 (void) close(fd); 693 694 part = str[strlen(str) - 1] - 'a'; 695 696 if (part < 0 || part >= dl.d_npartitions) 697 return (NULL); 698 699 /* Return NULL for unknown types - caller can fall back to ffs */ 700 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 701 vfstype = NULL; 702 else 703 vfstype = mountnames[fstype]; 704 705 return (vfstype); 706 } 707 708 static void 709 usage() 710 { 711 712 (void)fprintf(stderr, 713 "usage: mount %s\n mount %s\n mount %s\n", 714 "[-Aadfruvw] [-t type]", 715 "[-dfruvw] special | node", 716 "[-dfruvw] [-o options] [-t type] special node"); 717 exit(1); 718 /* NOTREACHED */ 719 } 720
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