1 /*- 2 * Copyright (c) 1980, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1980, 1989, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)umount.c 8.8 (Berkeley) 5/8/95 35 * $FreeBSD: src/sbin/umount/umount.c,v 1.28 2001/10/13 02:04:54 iedowse Exp $ 36 * $DragonFly: src/sbin/umount/umount.c,v 1.4 2005/11/06 12:51:01 swildner Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/mount.h> 41 #include <sys/socket.h> 42 43 #include <netdb.h> 44 #include <rpc/rpc.h> 45 #include <nfs/rpcv2.h> 46 47 #include <err.h> 48 #include <fstab.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include "mounttab.h" 55 56 #define ISDOT(x) ((x)[0] == '.' && (x)[1] == '\0') 57 #define ISDOTDOT(x) ((x)[0] == '.' && (x)[1] == '.' && (x)[2] == '\0') 58 59 typedef enum { MNTON, MNTFROM, NOTHING } mntwhat; 60 typedef enum { MARK, UNMARK, NAME, COUNT, FREE } dowhat; 61 62 struct addrinfo *nfshost_ai = NULL; 63 int fflag, vflag; 64 char *nfshost; 65 66 void checkmntlist (char *, char **, char **, char **); 67 int checkvfsname (const char *, char **); 68 char *getmntname (const char *, const char *, 69 mntwhat, char **, dowhat); 70 char *getrealname(char *, char *resolved_path); 71 char **makevfslist (const char *); 72 int mntinfo (struct statfs **); 73 int namematch (struct addrinfo *); 74 int sacmp (struct sockaddr *, struct sockaddr *); 75 int umountall (char **); 76 int checkname (char *, char **); 77 int umountfs (char *, char *, char *); 78 void usage (void); 79 int xdr_dir (XDR *, char *); 80 81 int 82 main(int argc, char *argv[]) 83 { 84 int all, errs, ch, mntsize, error; 85 char **typelist = NULL, *mntonname, *mntfromname; 86 char *type, *mntfromnamerev, *mntonnamerev; 87 struct statfs *mntbuf; 88 struct addrinfo hints; 89 90 /* Start disks transferring immediately. */ 91 sync(); 92 93 all = errs = 0; 94 while ((ch = getopt(argc, argv, "Aafh:t:v")) != -1) 95 switch (ch) { 96 case 'A': 97 all = 2; 98 break; 99 case 'a': 100 all = 1; 101 break; 102 case 'f': 103 fflag = MNT_FORCE; 104 break; 105 case 'h': /* -h implies -A. */ 106 all = 2; 107 nfshost = optarg; 108 break; 109 case 't': 110 if (typelist != NULL) 111 err(1, "only one -t option may be specified"); 112 typelist = makevfslist(optarg); 113 break; 114 case 'v': 115 vflag = 1; 116 break; 117 default: 118 usage(); 119 /* NOTREACHED */ 120 } 121 argc -= optind; 122 argv += optind; 123 124 if ((argc == 0 && !all) || (argc != 0 && all)) 125 usage(); 126 127 /* -h implies "-t nfs" if no -t flag. */ 128 if ((nfshost != NULL) && (typelist == NULL)) 129 typelist = makevfslist("nfs"); 130 131 if (nfshost != NULL) { 132 memset(&hints, 0, sizeof hints); 133 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai); 134 if (error) 135 errx(1, "%s: %s", nfshost, gai_strerror(error)); 136 } 137 138 switch (all) { 139 case 2: 140 if ((mntsize = mntinfo(&mntbuf)) <= 0) 141 break; 142 /* 143 * We unmount the nfs-mounts in the reverse order 144 * that they were mounted. 145 */ 146 for (errs = 0, mntsize--; mntsize > 0; mntsize--) { 147 if (checkvfsname(mntbuf[mntsize].f_fstypename, 148 typelist)) 149 continue; 150 /* 151 * Check if a mountpoint is laid over by another mount. 152 * A warning will be printed to stderr if this is 153 * the case. The laid over mount remains unmounted. 154 */ 155 mntonname = mntbuf[mntsize].f_mntonname; 156 mntfromname = mntbuf[mntsize].f_mntfromname; 157 mntonnamerev = getmntname(getmntname(mntonname, 158 NULL, MNTFROM, &type, NAME), NULL, 159 MNTON, &type, NAME); 160 161 mntfromnamerev = getmntname(mntonnamerev, 162 NULL, MNTFROM, &type, NAME); 163 164 if (strcmp(mntonnamerev, mntonname) == 0 && 165 strcmp(mntfromnamerev, mntfromname ) != 0) 166 warnx("cannot umount %s, %s\n " 167 "is mounted there, umount it first", 168 mntonname, mntfromnamerev); 169 170 if (checkname(mntbuf[mntsize].f_mntonname, 171 typelist) != 0) 172 errs = 1; 173 } 174 free(mntbuf); 175 break; 176 case 1: 177 if (setfsent() == 0) 178 err(1, "%s", _PATH_FSTAB); 179 errs = umountall(typelist); 180 break; 181 case 0: 182 for (errs = 0; *argv != NULL; ++argv) 183 if (checkname(*argv, typelist) != 0) 184 errs = 1; 185 break; 186 } 187 getmntname(NULL, NULL, NOTHING, NULL, FREE); 188 exit(errs); 189 } 190 191 int 192 umountall(char **typelist) 193 { 194 struct vfsconf vfc; 195 struct fstab *fs; 196 int rval; 197 char *cp; 198 static int firstcall = 1; 199 200 if ((fs = getfsent()) != NULL) 201 firstcall = 0; 202 else if (firstcall) 203 errx(1, "fstab reading failure"); 204 else 205 return (0); 206 do { 207 /* Ignore the root. */ 208 if (strcmp(fs->fs_file, "/") == 0) 209 continue; 210 /* 211 * !!! 212 * Historic practice: ignore unknown FSTAB_* fields. 213 */ 214 if (strcmp(fs->fs_type, FSTAB_RW) && 215 strcmp(fs->fs_type, FSTAB_RO) && 216 strcmp(fs->fs_type, FSTAB_RQ)) 217 continue; 218 /* Ignore unknown file system types. */ 219 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1) 220 continue; 221 if (checkvfsname(fs->fs_vfstype, typelist)) 222 continue; 223 224 /* 225 * We want to unmount the file systems in the reverse order 226 * that they were mounted. So, we save off the file name 227 * in some allocated memory, and then call recursively. 228 */ 229 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL) 230 err(1, "malloc failed"); 231 strcpy(cp, fs->fs_file); 232 rval = umountall(typelist); 233 rval = checkname(cp, typelist) || rval; 234 free(cp); 235 return (rval); 236 } while ((fs = getfsent()) != NULL); 237 return (0); 238 } 239 240 /* 241 * Do magic checks on mountpoint and device or hand over 242 * it to unmount(2) if everything fails. 243 */ 244 int 245 checkname(char *name, char **typelist) 246 { 247 size_t len; 248 int speclen; 249 char *mntonname, *mntfromname; 250 char *mntfromnamerev; 251 char *resolved, realname[MAXPATHLEN]; 252 char *type, *hostp, *delimp, *origname; 253 char none[] = "none"; 254 255 len = 0; 256 mntfromname = mntonname = delimp = hostp = NULL; 257 258 /* 259 * 1. Check if the name exists in the mounttable. 260 */ 261 checkmntlist(name, &mntfromname, &mntonname, &type); 262 /* 263 * 2. Remove trailing slashes if there are any. After that 264 * we look up the name in the mounttable again. 265 */ 266 if (mntfromname == NULL && mntonname == NULL) { 267 speclen = strlen(name); 268 for (speclen = strlen(name); 269 speclen > 1 && name[speclen - 1] == '/'; 270 speclen--) 271 name[speclen - 1] = '\0'; 272 checkmntlist(name, &mntfromname, &mntonname, &type); 273 resolved = name; 274 /* Save off original name in origname */ 275 if ((origname = strdup(name)) == NULL) 276 err(1, "strdup"); 277 /* 278 * 3. Check if the deprecated nfs-syntax with an '@' 279 * has been used and translate it to the ':' syntax. 280 * Look up the name in the mounttable again. 281 */ 282 if (mntfromname == NULL && mntonname == NULL) { 283 if ((delimp = strrchr(name, '@')) != NULL) { 284 hostp = delimp + 1; 285 if (*hostp != '\0') { 286 /* 287 * Make both '@' and ':' 288 * notations equal 289 */ 290 char *host = strdup(hostp); 291 len = strlen(hostp); 292 if (host == NULL) 293 err(1, "strdup"); 294 memmove(name + len + 1, name, 295 (size_t)(delimp - name)); 296 name[len] = ':'; 297 memmove(name, host, len); 298 free(host); 299 } 300 for (speclen = strlen(name); 301 speclen > 1 && name[speclen - 1] == '/'; 302 speclen--) 303 name[speclen - 1] = '\0'; 304 name[len + speclen + 1] = '\0'; 305 checkmntlist(name, &mntfromname, 306 &mntonname, &type); 307 resolved = name; 308 } 309 /* 310 * 4. Check if a relative mountpoint has been 311 * specified. This should happen as last check, 312 * the order is important. To prevent possible 313 * nfs-hangs, we just call realpath(3) on the 314 * basedir of mountpoint and add the dirname again. 315 * Check the name in mounttable one last time. 316 */ 317 if (mntfromname == NULL && mntonname == NULL) { 318 strcpy(name, origname); 319 if ((getrealname(name, realname)) != NULL) { 320 checkmntlist(realname, 321 &mntfromname, &mntonname, &type); 322 resolved = realname; 323 } 324 /* 325 * 5. All tests failed, just hand over the 326 * mountpoint to the kernel, maybe the statfs 327 * structure has been truncated or is not 328 * useful anymore because of a chroot(2). 329 * Please note that nfs will not be able to 330 * notify the nfs-server about unmounting. 331 * These things can change in future when the 332 * fstat structure get's more reliable, 333 * but at the moment we cannot thrust it. 334 */ 335 if (mntfromname == NULL && mntonname == NULL) { 336 strcpy(name, origname); 337 if (umountfs(NULL, origname, 338 none) == 0) {; 339 warnx("%s not found in " 340 "mount table, " 341 "unmounted it anyway", 342 origname); 343 free(origname); 344 return (0); 345 } else 346 free(origname); 347 return (1); 348 } 349 } 350 } 351 free(origname); 352 } else 353 resolved = name; 354 355 if (checkvfsname(type, typelist)) 356 return (1); 357 358 /* 359 * Check if the reverse entrys of the mounttable are really the 360 * same as the normal ones. 361 */ 362 if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname, 363 NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL) 364 err(1, "strdup"); 365 /* 366 * Mark the uppermost mount as unmounted. 367 */ 368 getmntname(mntfromname, mntonname, NOTHING, &type, MARK); 369 /* 370 * If several equal mounts are in the mounttable, check the order 371 * and warn the user if necessary. 372 */ 373 if (strcmp(mntfromnamerev, mntfromname ) != 0 && 374 strcmp(resolved, mntonname) != 0) { 375 warnx("cannot umount %s, %s\n " 376 "is mounted there, umount it first", 377 mntonname, mntfromnamerev); 378 379 /* call getmntname again to set mntcheck[i] to 0 */ 380 getmntname(mntfromname, mntonname, 381 NOTHING, &type, UNMARK); 382 return (1); 383 } 384 free(mntfromnamerev); 385 return (umountfs(mntfromname, mntonname, type)); 386 } 387 388 /* 389 * NFS stuff and unmount(2) call 390 */ 391 int 392 umountfs(char *mntfromname, char *mntonname, char *type) 393 { 394 enum clnt_stat clnt_stat; 395 struct timeval try; 396 struct addrinfo *ai, hints; 397 int do_rpc; 398 CLIENT *clp; 399 char *nfsdirname, *orignfsdirname; 400 char *hostp, *delimp; 401 402 ai = NULL; 403 do_rpc = 0; 404 hostp = NULL; 405 nfsdirname = delimp = orignfsdirname = NULL; 406 memset(&hints, 0, sizeof hints); 407 408 if (strcmp(type, "nfs") == 0) { 409 if ((nfsdirname = strdup(mntfromname)) == NULL) 410 err(1, "strdup"); 411 orignfsdirname = nfsdirname; 412 if ((delimp = strrchr(nfsdirname, ':')) != NULL) { 413 *delimp = '\0'; 414 hostp = nfsdirname; 415 getaddrinfo(hostp, NULL, &hints, &ai); 416 if (ai == NULL) { 417 warnx("can't get net id for host"); 418 } 419 nfsdirname = delimp + 1; 420 } 421 422 /* 423 * Check if we have to start the rpc-call later. 424 * If there are still identical nfs-names mounted, 425 * we skip the rpc-call. Obviously this has to 426 * happen before unmount(2), but it should happen 427 * after the previous namecheck. 428 * A non-NULL return means that this is the last 429 * mount from mntfromname that is still mounted. 430 */ 431 if (getmntname(mntfromname, NULL, NOTHING, &type, COUNT) 432 != NULL) 433 do_rpc = 1; 434 } 435 436 if (!namematch(ai)) 437 return (1); 438 if (unmount(mntonname, fflag) != 0 ) { 439 warn("unmount of %s failed", mntonname); 440 return (1); 441 } 442 if (vflag) 443 printf("%s: unmount from %s\n", mntfromname, mntonname); 444 /* 445 * Report to mountd-server which nfsname 446 * has been unmounted. 447 */ 448 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) { 449 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp"); 450 if (clp == NULL) { 451 warnx("%s: %s", hostp, 452 clnt_spcreateerror("RPCPROG_MNT")); 453 return (1); 454 } 455 clp->cl_auth = authsys_create_default(); 456 try.tv_sec = 20; 457 try.tv_usec = 0; 458 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, (xdrproc_t)xdr_dir, 459 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try); 460 if (clnt_stat != RPC_SUCCESS) { 461 warnx("%s: %s", hostp, 462 clnt_sperror(clp, "RPCMNT_UMOUNT")); 463 return (1); 464 } 465 /* 466 * Remove the unmounted entry from /var/db/mounttab. 467 */ 468 if (read_mtab()) { 469 clean_mtab(hostp, nfsdirname, vflag); 470 if(!write_mtab(vflag)) 471 warnx("cannot remove mounttab entry %s:%s", 472 hostp, nfsdirname); 473 free_mtab(); 474 } 475 free(orignfsdirname); 476 auth_destroy(clp->cl_auth); 477 clnt_destroy(clp); 478 } 479 return (0); 480 } 481 482 char * 483 getmntname(const char *fromname, const char *onname, 484 mntwhat what, char **type, dowhat mark) 485 { 486 static struct statfs *mntbuf; 487 static int mntsize = 0; 488 static char *mntcheck = NULL; 489 static char *mntcount = NULL; 490 int i, count; 491 492 if (mntsize <= 0) { 493 if ((mntsize = mntinfo(&mntbuf)) <= 0) 494 return (NULL); 495 } 496 if (mntcheck == NULL) { 497 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL || 498 (mntcount = calloc(mntsize + 1, sizeof(int))) == NULL) 499 err(1, "calloc"); 500 } 501 /* 502 * We want to get the file systems in the reverse order 503 * that they were mounted. Mounted and unmounted filesystems 504 * are marked or unmarked in a table called 'mntcheck'. 505 * Unmount(const char *dir, int flags) does only take the 506 * mountpoint as argument, not the destination. If we don't pay 507 * attention to the order, it can happen that a overlaying 508 * filesystem get's unmounted instead of the one the user 509 * has choosen. 510 */ 511 switch (mark) { 512 case NAME: 513 /* Return only the specific name */ 514 for (i = mntsize - 1; i >= 0; i--) { 515 if (fromname != NULL && what == MNTON && 516 !strcmp(mntbuf[i].f_mntfromname, fromname) && 517 mntcheck[i] != 1) { 518 if (type) 519 *type = mntbuf[i].f_fstypename; 520 return (mntbuf[i].f_mntonname); 521 } 522 if (fromname != NULL && what == MNTFROM && 523 !strcmp(mntbuf[i].f_mntonname, fromname) && 524 mntcheck[i] != 1) { 525 if (type) 526 *type = mntbuf[i].f_fstypename; 527 return (mntbuf[i].f_mntfromname); 528 } 529 } 530 return (NULL); 531 case MARK: 532 /* Mark current mount with '1' and return name */ 533 for (i = mntsize - 1; i >= 0; i--) { 534 if (mntcheck[i] == 0 && 535 (strcmp(mntbuf[i].f_mntonname, onname) == 0) && 536 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) { 537 mntcheck[i] = 1; 538 return (mntbuf[i].f_mntonname); 539 } 540 } 541 return (NULL); 542 case UNMARK: 543 /* Unmark current mount with '0' and return name */ 544 for (i = 0; i < mntsize; i++) { 545 if (mntcheck[i] == 1 && 546 (strcmp(mntbuf[i].f_mntonname, onname) == 0) && 547 (strcmp(mntbuf[i].f_mntfromname, fromname) == 0)) { 548 mntcheck[i] = 0; 549 return (mntbuf[i].f_mntonname); 550 } 551 } 552 return (NULL); 553 case COUNT: 554 /* Count the equal mntfromnames */ 555 count = 0; 556 for (i = mntsize - 1; i >= 0; i--) { 557 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0) 558 count++; 559 } 560 /* Mark the already unmounted mounts and return 561 * mntfromname if count <= 1. Else return NULL. 562 */ 563 for (i = mntsize - 1; i >= 0; i--) { 564 if (strcmp(mntbuf[i].f_mntfromname, fromname) == 0) { 565 if (mntcount[i] == 1) 566 count--; 567 else { 568 mntcount[i] = 1; 569 break; 570 } 571 } 572 } 573 if (count <= 1) 574 return (mntbuf[i].f_mntonname); 575 else 576 return (NULL); 577 case FREE: 578 free(mntbuf); 579 free(mntcheck); 580 free(mntcount); 581 return (NULL); 582 default: 583 return (NULL); 584 } 585 } 586 587 int 588 sacmp(struct sockaddr *sa1, struct sockaddr *sa2) 589 { 590 void *p1, *p2; 591 int len; 592 593 if (sa1->sa_family != sa2->sa_family) 594 return (1); 595 596 switch (sa1->sa_family) { 597 case AF_INET: 598 p1 = &((struct sockaddr_in *)sa1)->sin_addr; 599 p2 = &((struct sockaddr_in *)sa2)->sin_addr; 600 len = 4; 601 break; 602 case AF_INET6: 603 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr; 604 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr; 605 len = 16; 606 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 607 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 608 return (1); 609 break; 610 default: 611 return (1); 612 } 613 614 return memcmp(p1, p2, len); 615 } 616 617 int 618 namematch(struct addrinfo *ai) 619 { 620 struct addrinfo *aip; 621 622 if (nfshost == NULL || nfshost_ai == NULL) 623 return (1); 624 625 while (ai != NULL) { 626 aip = nfshost_ai; 627 while (aip != NULL) { 628 if (sacmp(ai->ai_addr, aip->ai_addr) == 0) 629 return (1); 630 aip = aip->ai_next; 631 } 632 ai = ai->ai_next; 633 } 634 635 return (0); 636 } 637 638 void 639 checkmntlist(char *name, char **fromname, char **onname, char **type) 640 { 641 642 *fromname = getmntname(name, NULL, MNTFROM, type, NAME); 643 if (*fromname == NULL) { 644 *onname = getmntname(name, NULL, MNTON, type, NAME); 645 if (*onname != NULL) 646 *fromname = name; 647 } else 648 *onname = name; 649 } 650 651 int 652 mntinfo(struct statfs **mntbuf) 653 { 654 static struct statfs *origbuf; 655 size_t bufsize; 656 int mntsize; 657 658 mntsize = getfsstat(NULL, 0, MNT_NOWAIT); 659 if (mntsize <= 0) 660 return (0); 661 bufsize = (mntsize + 1) * sizeof(struct statfs); 662 if ((origbuf = malloc(bufsize)) == NULL) 663 err(1, "malloc"); 664 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT); 665 *mntbuf = origbuf; 666 return (mntsize); 667 } 668 669 char * 670 getrealname(char *name, char *realname) 671 { 672 char *dirname; 673 int havedir; 674 size_t baselen; 675 size_t dirlen; 676 677 dirname = '\0'; 678 havedir = 0; 679 if (*name == '/') { 680 if (ISDOT(name + 1) || ISDOTDOT(name + 1)) 681 strcpy(realname, "/"); 682 else { 683 if ((dirname = strrchr(name + 1, '/')) == NULL) 684 snprintf(realname, MAXPATHLEN, "%s", name); 685 else 686 havedir = 1; 687 } 688 } else { 689 if (ISDOT(name) || ISDOTDOT(name)) 690 realpath(name, realname); 691 else { 692 if ((dirname = strrchr(name, '/')) == NULL) { 693 if ((realpath(name, realname)) == NULL) 694 return (NULL); 695 } else 696 havedir = 1; 697 } 698 } 699 if (havedir) { 700 *dirname++ = '\0'; 701 if (ISDOT(dirname)) { 702 *dirname = '\0'; 703 if ((realpath(name, realname)) == NULL) 704 return (NULL); 705 } else if (ISDOTDOT(dirname)) { 706 *--dirname = '/'; 707 if ((realpath(name, realname)) == NULL) 708 return (NULL); 709 } else { 710 if ((realpath(name, realname)) == NULL) 711 return (NULL); 712 baselen = strlen(realname); 713 dirlen = strlen(dirname); 714 if (baselen + dirlen + 1 > MAXPATHLEN) 715 return (NULL); 716 if (realname[1] == '\0') { 717 memmove(realname + 1, dirname, dirlen); 718 realname[dirlen + 1] = '\0'; 719 } else { 720 realname[baselen] = '/'; 721 memmove(realname + baselen + 1, 722 dirname, dirlen); 723 realname[baselen + dirlen + 1] = '\0'; 724 } 725 } 726 } 727 return (realname); 728 } 729 730 /* 731 * xdr routines for mount rpc's 732 */ 733 int 734 xdr_dir(XDR *xdrsp, char *dirp) 735 { 736 737 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 738 } 739 740 void 741 usage(void) 742 { 743 744 fprintf(stderr, "%s\n%s\n", 745 "usage: umount [-fv] special | node", 746 " umount -a | -A [-fv] [-h host] [-t type]"); 747 exit(1); 748 } 749