1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1989, 1993 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 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1980, 1989, 1993\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[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95"; 41 #endif 42 static const char rcsid[] = 43 "$FreeBSD$"; 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/mount.h> 48 #include <sys/socket.h> 49 #include <sys/stat.h> 50 51 #include <netdb.h> 52 #include <rpc/rpc.h> 53 #include <rpcsvc/mount.h> 54 #include <nfs/nfssvc.h> 55 56 #include <ctype.h> 57 #include <err.h> 58 #include <errno.h> 59 #include <fstab.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include "mounttab.h" 66 67 typedef enum { FIND, REMOVE, CHECKUNIQUE } dowhat; 68 69 static struct addrinfo *nfshost_ai = NULL; 70 static int fflag, vflag; 71 static char *nfshost; 72 73 struct statfs *checkmntlist(char *); 74 int checkvfsname (const char *, char **); 75 struct statfs *getmntentry(const char *fromname, const char *onname, 76 fsid_t *fsid, dowhat what); 77 char **makevfslist (const char *); 78 size_t mntinfo (struct statfs **); 79 int namematch (struct addrinfo *); 80 int parsehexfsid(const char *hex, fsid_t *fsid); 81 int sacmp (void *, void *); 82 int umountall (char **); 83 int checkname (char *, char **); 84 int umountfs(struct statfs *sfs); 85 void usage (void); 86 int xdr_dir (XDR *, char *); 87 88 int 89 main(int argc, char *argv[]) 90 { 91 int all, errs, ch, mntsize, error, nfsforce, ret; 92 char **typelist = NULL; 93 struct statfs *mntbuf, *sfs; 94 struct addrinfo hints; 95 96 nfsforce = all = errs = 0; 97 while ((ch = getopt(argc, argv, "AaF:fh:Nnt:v")) != -1) 98 switch (ch) { 99 case 'A': 100 all = 2; 101 break; 102 case 'a': 103 all = 1; 104 break; 105 case 'F': 106 setfstab(optarg); 107 break; 108 case 'f': 109 fflag |= MNT_FORCE; 110 break; 111 case 'h': /* -h implies -A. */ 112 all = 2; 113 nfshost = optarg; 114 break; 115 case 'N': 116 nfsforce = 1; 117 break; 118 case 'n': 119 fflag |= MNT_NONBUSY; 120 break; 121 case 't': 122 if (typelist != NULL) 123 err(1, "only one -t option may be specified"); 124 typelist = makevfslist(optarg); 125 break; 126 case 'v': 127 vflag = 1; 128 break; 129 default: 130 usage(); 131 /* NOTREACHED */ 132 } 133 argc -= optind; 134 argv += optind; 135 136 if ((fflag & MNT_FORCE) != 0 && (fflag & MNT_NONBUSY) != 0) 137 err(1, "-f and -n are mutually exclusive"); 138 139 if ((argc == 0 && !all) || (argc != 0 && all)) 140 usage(); 141 142 if (nfsforce != 0 && (argc == 0 || nfshost != NULL || typelist != NULL)) 143 usage(); 144 145 /* -h implies "-t nfs" if no -t flag. */ 146 if ((nfshost != NULL) && (typelist == NULL)) 147 typelist = makevfslist("nfs"); 148 149 if (nfshost != NULL) { 150 memset(&hints, 0, sizeof hints); 151 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai); 152 if (error) 153 errx(1, "%s: %s", nfshost, gai_strerror(error)); 154 } 155 156 switch (all) { 157 case 2: 158 if ((mntsize = mntinfo(&mntbuf)) <= 0) 159 break; 160 /* 161 * We unmount the nfs-mounts in the reverse order 162 * that they were mounted. 163 */ 164 for (errs = 0, mntsize--; mntsize > 0; mntsize--) { 165 sfs = &mntbuf[mntsize]; 166 if (checkvfsname(sfs->f_fstypename, typelist)) 167 continue; 168 if (strcmp(sfs->f_mntonname, "/dev") == 0) 169 continue; 170 if (umountfs(sfs) != 0) 171 errs = 1; 172 } 173 free(mntbuf); 174 break; 175 case 1: 176 if (setfsent() == 0) 177 err(1, "%s", getfstab()); 178 errs = umountall(typelist); 179 break; 180 case 0: 181 for (errs = 0; *argv != NULL; ++argv) 182 if (nfsforce != 0) { 183 /* 184 * First do the nfssvc() syscall to shut down 185 * the mount point and then do the forced 186 * dismount. 187 */ 188 ret = nfssvc(NFSSVC_FORCEDISM, *argv); 189 if (ret >= 0) 190 ret = unmount(*argv, MNT_FORCE); 191 if (ret < 0) { 192 warn("%s", *argv); 193 errs = 1; 194 } 195 } else if (checkname(*argv, typelist) != 0) 196 errs = 1; 197 break; 198 } 199 exit(errs); 200 } 201 202 int 203 umountall(char **typelist) 204 { 205 struct xvfsconf vfc; 206 struct fstab *fs; 207 int rval; 208 char *cp; 209 static int firstcall = 1; 210 211 if ((fs = getfsent()) != NULL) 212 firstcall = 0; 213 else if (firstcall) 214 errx(1, "fstab reading failure"); 215 else 216 return (0); 217 do { 218 /* Ignore the root. */ 219 if (strcmp(fs->fs_file, "/") == 0) 220 continue; 221 /* 222 * !!! 223 * Historic practice: ignore unknown FSTAB_* fields. 224 */ 225 if (strcmp(fs->fs_type, FSTAB_RW) && 226 strcmp(fs->fs_type, FSTAB_RO) && 227 strcmp(fs->fs_type, FSTAB_RQ)) 228 continue; 229 /* Ignore unknown file system types. */ 230 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1) 231 continue; 232 if (checkvfsname(fs->fs_vfstype, typelist)) 233 continue; 234 235 /* 236 * We want to unmount the file systems in the reverse order 237 * that they were mounted. So, we save off the file name 238 * in some allocated memory, and then call recursively. 239 */ 240 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL) 241 err(1, "malloc failed"); 242 (void)strcpy(cp, fs->fs_file); 243 rval = umountall(typelist); 244 rval = checkname(cp, typelist) || rval; 245 free(cp); 246 return (rval); 247 } while ((fs = getfsent()) != NULL); 248 return (0); 249 } 250 251 /* 252 * Do magic checks on mountpoint/device/fsid, and then call unmount(2). 253 */ 254 int 255 checkname(char *mntname, char **typelist) 256 { 257 char buf[MAXPATHLEN]; 258 struct statfs sfsbuf; 259 struct stat sb; 260 struct statfs *sfs; 261 char *delimp; 262 dev_t dev; 263 int len; 264 265 /* 266 * 1. Check if the name exists in the mounttable. 267 */ 268 sfs = checkmntlist(mntname); 269 /* 270 * 2. Remove trailing slashes if there are any. After that 271 * we look up the name in the mounttable again. 272 */ 273 if (sfs == NULL) { 274 len = strlen(mntname); 275 while (len > 1 && mntname[len - 1] == '/') 276 mntname[--len] = '\0'; 277 sfs = checkmntlist(mntname); 278 } 279 /* 280 * 3. Check if the deprecated NFS syntax with an '@' has been used 281 * and translate it to the ':' syntax. Look up the name in the 282 * mount table again. 283 */ 284 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) { 285 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1, 286 (int)(delimp - mntname), mntname); 287 len = strlen(buf); 288 while (len > 1 && buf[len - 1] == '/') 289 buf[--len] = '\0'; 290 sfs = checkmntlist(buf); 291 } 292 /* 293 * 4. Resort to a statfs(2) call. This is the last check so that 294 * hung NFS filesystems for example can be unmounted without 295 * potentially blocking forever in statfs() as long as the 296 * filesystem is specified unambiguously. This covers all the 297 * hard cases such as symlinks and mismatches between the 298 * mount list and reality. 299 * We also do this if an ambiguous mount point was specified. 300 */ 301 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL && 302 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) { 303 if (statfs(mntname, &sfsbuf) != 0) { 304 warn("%s: statfs", mntname); 305 } else if (stat(mntname, &sb) != 0) { 306 warn("%s: stat", mntname); 307 } else if (S_ISDIR(sb.st_mode)) { 308 /* Check that `mntname' is the root directory. */ 309 dev = sb.st_dev; 310 snprintf(buf, sizeof(buf), "%s/..", mntname); 311 if (stat(buf, &sb) != 0) { 312 warn("%s: stat", buf); 313 } else if (sb.st_dev == dev) { 314 warnx("%s: not a file system root directory", 315 mntname); 316 return (1); 317 } else 318 sfs = &sfsbuf; 319 } 320 } 321 if (sfs == NULL) { 322 warnx("%s: unknown file system", mntname); 323 return (1); 324 } 325 if (checkvfsname(sfs->f_fstypename, typelist)) 326 return (1); 327 return (umountfs(sfs)); 328 } 329 330 /* 331 * NFS stuff and unmount(2) call 332 */ 333 int 334 umountfs(struct statfs *sfs) 335 { 336 char fsidbuf[64]; 337 enum clnt_stat clnt_stat; 338 struct timeval try; 339 struct addrinfo *ai, hints; 340 int do_rpc; 341 CLIENT *clp; 342 char *nfsdirname, *orignfsdirname; 343 char *hostp, *delimp; 344 char buf[1024]; 345 struct nfscl_dumpmntopts dumpmntopts; 346 const char *proto_ptr = NULL; 347 348 ai = NULL; 349 do_rpc = 0; 350 hostp = NULL; 351 nfsdirname = delimp = orignfsdirname = NULL; 352 memset(&hints, 0, sizeof hints); 353 354 if (strcmp(sfs->f_fstypename, "nfs") == 0) { 355 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL) 356 err(1, "strdup"); 357 orignfsdirname = nfsdirname; 358 if (*nfsdirname == '[' && 359 (delimp = strchr(nfsdirname + 1, ']')) != NULL && 360 *(delimp + 1) == ':') { 361 hostp = nfsdirname + 1; 362 nfsdirname = delimp + 2; 363 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) { 364 hostp = nfsdirname; 365 nfsdirname = delimp + 1; 366 } 367 if (hostp != NULL) { 368 *delimp = '\0'; 369 getaddrinfo(hostp, NULL, &hints, &ai); 370 if (ai == NULL) { 371 warnx("can't get net id for host"); 372 } 373 } 374 375 /* 376 * Check if we have to start the rpc-call later. 377 * If there are still identical nfs-names mounted, 378 * we skip the rpc-call. Obviously this has to 379 * happen before unmount(2), but it should happen 380 * after the previous namecheck. 381 * A non-NULL return means that this is the last 382 * mount from mntfromname that is still mounted. 383 */ 384 if (getmntentry(sfs->f_mntfromname, NULL, NULL, 385 CHECKUNIQUE) != NULL) { 386 do_rpc = 1; 387 proto_ptr = "udp"; 388 /* 389 * Try and find out whether this NFS mount is NFSv4 and 390 * what protocol is being used. If this fails, the 391 * default is NFSv2,3 and use UDP for the Unmount RPC. 392 */ 393 dumpmntopts.ndmnt_fname = sfs->f_mntonname; 394 dumpmntopts.ndmnt_buf = buf; 395 dumpmntopts.ndmnt_blen = sizeof(buf); 396 if (nfssvc(NFSSVC_DUMPMNTOPTS, &dumpmntopts) >= 0) { 397 if (strstr(buf, "nfsv4,") != NULL) 398 do_rpc = 0; 399 else if (strstr(buf, ",tcp,") != NULL) 400 proto_ptr = "tcp"; 401 } 402 } 403 } 404 405 if (!namematch(ai)) { 406 free(orignfsdirname); 407 return (1); 408 } 409 /* First try to unmount using the file system ID. */ 410 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0], 411 sfs->f_fsid.val[1]); 412 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) { 413 /* XXX, non-root users get a zero fsid, so don't warn. */ 414 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 || 415 sfs->f_fsid.val[1] != 0) 416 warn("unmount of %s failed", sfs->f_mntonname); 417 if (errno != ENOENT) { 418 free(orignfsdirname); 419 return (1); 420 } 421 /* Compatibility for old kernels. */ 422 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0) 423 warnx("retrying using path instead of file system ID"); 424 if (unmount(sfs->f_mntonname, fflag) != 0) { 425 warn("unmount of %s failed", sfs->f_mntonname); 426 free(orignfsdirname); 427 return (1); 428 } 429 } 430 /* Mark this file system as unmounted. */ 431 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE); 432 if (vflag) 433 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname, 434 sfs->f_mntonname); 435 /* 436 * Report to mountd-server which nfsname 437 * has been unmounted. 438 */ 439 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) { 440 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, proto_ptr); 441 if (clp == NULL) { 442 warnx("%s: %s", hostp, 443 clnt_spcreateerror("MOUNTPROG")); 444 free(orignfsdirname); 445 return (1); 446 } 447 clp->cl_auth = authsys_create_default(); 448 try.tv_sec = 20; 449 try.tv_usec = 0; 450 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir, 451 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try); 452 if (clnt_stat != RPC_SUCCESS) { 453 warnx("%s: %s", hostp, 454 clnt_sperror(clp, "RPCMNT_UMOUNT")); 455 free(orignfsdirname); 456 return (1); 457 } 458 /* 459 * Remove the unmounted entry from /var/db/mounttab. 460 */ 461 if (read_mtab()) { 462 clean_mtab(hostp, nfsdirname, vflag); 463 if(!write_mtab(vflag)) 464 warnx("cannot remove mounttab entry %s:%s", 465 hostp, nfsdirname); 466 free_mtab(); 467 } 468 auth_destroy(clp->cl_auth); 469 clnt_destroy(clp); 470 } 471 free(orignfsdirname); 472 return (0); 473 } 474 475 struct statfs * 476 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what) 477 { 478 static struct statfs *mntbuf; 479 static size_t mntsize = 0; 480 static int *mntcheck = NULL; 481 struct statfs *sfs, *foundsfs; 482 int i, count; 483 484 if (mntsize <= 0) { 485 if ((mntsize = mntinfo(&mntbuf)) <= 0) 486 return (NULL); 487 } 488 if (mntcheck == NULL) { 489 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL) 490 err(1, "calloc"); 491 } 492 /* 493 * We want to get the file systems in the reverse order 494 * that they were mounted. Unmounted file systems are marked 495 * in a table called 'mntcheck'. 496 */ 497 count = 0; 498 foundsfs = NULL; 499 for (i = mntsize - 1; i >= 0; i--) { 500 if (mntcheck[i]) 501 continue; 502 sfs = &mntbuf[i]; 503 if (fromname != NULL && strcmp(sfs->f_mntfromname, 504 fromname) != 0) 505 continue; 506 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0) 507 continue; 508 if (fsid != NULL && fsidcmp(&sfs->f_fsid, fsid) != 0) 509 continue; 510 511 switch (what) { 512 case CHECKUNIQUE: 513 foundsfs = sfs; 514 count++; 515 continue; 516 case REMOVE: 517 mntcheck[i] = 1; 518 break; 519 default: 520 break; 521 } 522 return (sfs); 523 } 524 525 if (what == CHECKUNIQUE && count == 1) 526 return (foundsfs); 527 return (NULL); 528 } 529 530 int 531 sacmp(void *sa1, void *sa2) 532 { 533 void *p1, *p2; 534 int len; 535 536 if (((struct sockaddr *)sa1)->sa_family != 537 ((struct sockaddr *)sa2)->sa_family) 538 return (1); 539 540 switch (((struct sockaddr *)sa1)->sa_family) { 541 case AF_INET: 542 p1 = &((struct sockaddr_in *)sa1)->sin_addr; 543 p2 = &((struct sockaddr_in *)sa2)->sin_addr; 544 len = 4; 545 break; 546 case AF_INET6: 547 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr; 548 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr; 549 len = 16; 550 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 551 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 552 return (1); 553 break; 554 default: 555 return (1); 556 } 557 558 return memcmp(p1, p2, len); 559 } 560 561 int 562 namematch(struct addrinfo *ai) 563 { 564 struct addrinfo *aip; 565 566 if (nfshost == NULL || nfshost_ai == NULL) 567 return (1); 568 569 while (ai != NULL) { 570 aip = nfshost_ai; 571 while (aip != NULL) { 572 if (sacmp(ai->ai_addr, aip->ai_addr) == 0) 573 return (1); 574 aip = aip->ai_next; 575 } 576 ai = ai->ai_next; 577 } 578 579 return (0); 580 } 581 582 struct statfs * 583 checkmntlist(char *mntname) 584 { 585 struct statfs *sfs; 586 fsid_t fsid; 587 588 sfs = NULL; 589 if (parsehexfsid(mntname, &fsid) == 0) 590 sfs = getmntentry(NULL, NULL, &fsid, FIND); 591 if (sfs == NULL) 592 sfs = getmntentry(NULL, mntname, NULL, FIND); 593 if (sfs == NULL) 594 sfs = getmntentry(mntname, NULL, NULL, FIND); 595 return (sfs); 596 } 597 598 size_t 599 mntinfo(struct statfs **mntbuf) 600 { 601 static struct statfs *origbuf; 602 size_t bufsize; 603 int mntsize; 604 605 mntsize = getfsstat(NULL, 0, MNT_NOWAIT); 606 if (mntsize <= 0) 607 return (0); 608 bufsize = (mntsize + 1) * sizeof(struct statfs); 609 if ((origbuf = malloc(bufsize)) == NULL) 610 err(1, "malloc"); 611 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT); 612 *mntbuf = origbuf; 613 return (mntsize); 614 } 615 616 /* 617 * Convert a hexadecimal filesystem ID to an fsid_t. 618 * Returns 0 on success. 619 */ 620 int 621 parsehexfsid(const char *hex, fsid_t *fsid) 622 { 623 char hexbuf[3]; 624 int i; 625 626 if (strlen(hex) != sizeof(*fsid) * 2) 627 return (-1); 628 hexbuf[2] = '\0'; 629 for (i = 0; i < (int)sizeof(*fsid); i++) { 630 hexbuf[0] = hex[i * 2]; 631 hexbuf[1] = hex[i * 2 + 1]; 632 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1])) 633 return (-1); 634 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16); 635 } 636 return (0); 637 } 638 639 /* 640 * xdr routines for mount rpc's 641 */ 642 int 643 xdr_dir(XDR *xdrsp, char *dirp) 644 { 645 646 return (xdr_string(xdrsp, &dirp, MNTPATHLEN)); 647 } 648 649 void 650 usage(void) 651 { 652 653 (void)fprintf(stderr, "%s\n%s\n", 654 "usage: umount [-fNnv] special ... | node ... | fsid ...", 655 " umount -a | -A [-F fstab] [-fnv] [-h host] [-t type]"); 656 exit(1); 657 } 658