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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1980, 1989, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95"; 39 #endif 40 static const char rcsid[] = 41 "$FreeBSD$"; 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/mount.h> 46 #include <sys/socket.h> 47 #include <sys/stat.h> 48 49 #include <netdb.h> 50 #include <rpc/rpc.h> 51 #include <rpcsvc/mount.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <fstab.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 #include "mounttab.h" 63 64 typedef enum { FIND, REMOVE, CHECKUNIQUE } dowhat; 65 66 struct addrinfo *nfshost_ai = NULL; 67 int fflag, vflag; 68 char *nfshost; 69 70 struct statfs *checkmntlist(char *); 71 int checkvfsname (const char *, char **); 72 struct statfs *getmntentry(const char *fromname, const char *onname, 73 fsid_t *fsid, dowhat what); 74 char **makevfslist (const char *); 75 size_t mntinfo (struct statfs **); 76 int namematch (struct addrinfo *); 77 int parsehexfsid(const char *hex, fsid_t *fsid); 78 int sacmp (void *, void *); 79 int umountall (char **); 80 int checkname (char *, char **); 81 int umountfs(struct statfs *sfs); 82 void usage (void); 83 int xdr_dir (XDR *, char *); 84 85 int 86 main(int argc, char *argv[]) 87 { 88 int all, errs, ch, mntsize, error; 89 char **typelist = NULL; 90 struct statfs *mntbuf, *sfs; 91 struct addrinfo hints; 92 93 all = errs = 0; 94 while ((ch = getopt(argc, argv, "AaF:fh: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 setfstab(optarg); 104 break; 105 case 'f': 106 fflag = MNT_FORCE; 107 break; 108 case 'h': /* -h implies -A. */ 109 all = 2; 110 nfshost = optarg; 111 break; 112 case 't': 113 if (typelist != NULL) 114 err(1, "only one -t option may be specified"); 115 typelist = makevfslist(optarg); 116 break; 117 case 'v': 118 vflag = 1; 119 break; 120 default: 121 usage(); 122 /* NOTREACHED */ 123 } 124 argc -= optind; 125 argv += optind; 126 127 /* Start disks transferring immediately. */ 128 if ((fflag & MNT_FORCE) == 0) 129 sync(); 130 131 if ((argc == 0 && !all) || (argc != 0 && all)) 132 usage(); 133 134 /* -h implies "-t nfs" if no -t flag. */ 135 if ((nfshost != NULL) && (typelist == NULL)) 136 typelist = makevfslist("nfs"); 137 138 if (nfshost != NULL) { 139 memset(&hints, 0, sizeof hints); 140 error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai); 141 if (error) 142 errx(1, "%s: %s", nfshost, gai_strerror(error)); 143 } 144 145 switch (all) { 146 case 2: 147 if ((mntsize = mntinfo(&mntbuf)) <= 0) 148 break; 149 /* 150 * We unmount the nfs-mounts in the reverse order 151 * that they were mounted. 152 */ 153 for (errs = 0, mntsize--; mntsize > 0; mntsize--) { 154 sfs = &mntbuf[mntsize]; 155 if (checkvfsname(sfs->f_fstypename, typelist)) 156 continue; 157 if (umountfs(sfs) != 0) 158 errs = 1; 159 } 160 free(mntbuf); 161 break; 162 case 1: 163 if (setfsent() == 0) 164 err(1, "%s", getfstab()); 165 errs = umountall(typelist); 166 break; 167 case 0: 168 for (errs = 0; *argv != NULL; ++argv) 169 if (checkname(*argv, typelist) != 0) 170 errs = 1; 171 break; 172 } 173 exit(errs); 174 } 175 176 int 177 umountall(char **typelist) 178 { 179 struct xvfsconf vfc; 180 struct fstab *fs; 181 int rval; 182 char *cp; 183 static int firstcall = 1; 184 185 if ((fs = getfsent()) != NULL) 186 firstcall = 0; 187 else if (firstcall) 188 errx(1, "fstab reading failure"); 189 else 190 return (0); 191 do { 192 /* Ignore the root. */ 193 if (strcmp(fs->fs_file, "/") == 0) 194 continue; 195 /* 196 * !!! 197 * Historic practice: ignore unknown FSTAB_* fields. 198 */ 199 if (strcmp(fs->fs_type, FSTAB_RW) && 200 strcmp(fs->fs_type, FSTAB_RO) && 201 strcmp(fs->fs_type, FSTAB_RQ)) 202 continue; 203 /* Ignore unknown file system types. */ 204 if (getvfsbyname(fs->fs_vfstype, &vfc) == -1) 205 continue; 206 if (checkvfsname(fs->fs_vfstype, typelist)) 207 continue; 208 209 /* 210 * We want to unmount the file systems in the reverse order 211 * that they were mounted. So, we save off the file name 212 * in some allocated memory, and then call recursively. 213 */ 214 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL) 215 err(1, "malloc failed"); 216 (void)strcpy(cp, fs->fs_file); 217 rval = umountall(typelist); 218 rval = checkname(cp, typelist) || rval; 219 free(cp); 220 return (rval); 221 } while ((fs = getfsent()) != NULL); 222 return (0); 223 } 224 225 /* 226 * Do magic checks on mountpoint/device/fsid, and then call unmount(2). 227 */ 228 int 229 checkname(char *mntname, char **typelist) 230 { 231 char buf[MAXPATHLEN]; 232 struct statfs sfsbuf; 233 struct stat sb; 234 struct statfs *sfs; 235 char *delimp; 236 dev_t dev; 237 int len; 238 239 /* 240 * 1. Check if the name exists in the mounttable. 241 */ 242 sfs = checkmntlist(mntname); 243 /* 244 * 2. Remove trailing slashes if there are any. After that 245 * we look up the name in the mounttable again. 246 */ 247 if (sfs == NULL) { 248 len = strlen(mntname); 249 while (len > 1 && mntname[len - 1] == '/') 250 mntname[--len] = '\0'; 251 sfs = checkmntlist(mntname); 252 } 253 /* 254 * 3. Check if the deprecated NFS syntax with an '@' has been used 255 * and translate it to the ':' syntax. Look up the name in the 256 * mount table again. 257 */ 258 if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) { 259 snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1, 260 (int)(delimp - mntname), mntname); 261 len = strlen(buf); 262 while (len > 1 && buf[len - 1] == '/') 263 buf[--len] = '\0'; 264 sfs = checkmntlist(buf); 265 } 266 /* 267 * 4. Resort to a statfs(2) call. This is the last check so that 268 * hung NFS filesystems for example can be unmounted without 269 * potentially blocking forever in statfs() as long as the 270 * filesystem is specified unambiguously. This covers all the 271 * hard cases such as symlinks and mismatches between the 272 * mount list and reality. 273 * We also do this if an ambiguous mount point was specified. 274 */ 275 if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL && 276 getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) { 277 if (statfs(mntname, &sfsbuf) != 0) { 278 warn("%s: statfs", mntname); 279 } else if (stat(mntname, &sb) != 0) { 280 warn("%s: stat", mntname); 281 } else if (S_ISDIR(sb.st_mode)) { 282 /* Check that `mntname' is the root directory. */ 283 dev = sb.st_dev; 284 snprintf(buf, sizeof(buf), "%s/..", mntname); 285 if (stat(buf, &sb) != 0) { 286 warn("%s: stat", buf); 287 } else if (sb.st_dev == dev) { 288 warnx("%s: not a file system root directory", 289 mntname); 290 return (1); 291 } else 292 sfs = &sfsbuf; 293 } 294 } 295 if (sfs == NULL) { 296 warnx("%s: unknown file system", mntname); 297 return (1); 298 } 299 if (checkvfsname(sfs->f_fstypename, typelist)) 300 return (1); 301 return (umountfs(sfs)); 302 } 303 304 /* 305 * NFS stuff and unmount(2) call 306 */ 307 int 308 umountfs(struct statfs *sfs) 309 { 310 char fsidbuf[64]; 311 enum clnt_stat clnt_stat; 312 struct timeval try; 313 struct addrinfo *ai, hints; 314 int do_rpc; 315 CLIENT *clp; 316 char *nfsdirname, *orignfsdirname; 317 char *hostp, *delimp; 318 319 ai = NULL; 320 do_rpc = 0; 321 hostp = NULL; 322 nfsdirname = delimp = orignfsdirname = NULL; 323 memset(&hints, 0, sizeof hints); 324 325 if (strcmp(sfs->f_fstypename, "nfs") == 0) { 326 if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL) 327 err(1, "strdup"); 328 orignfsdirname = nfsdirname; 329 if (*nfsdirname == '[' && 330 (delimp = strchr(nfsdirname + 1, ']')) != NULL && 331 *(delimp + 1) == ':') { 332 hostp = nfsdirname + 1; 333 nfsdirname = delimp + 2; 334 } else if ((delimp = strrchr(nfsdirname, ':')) != NULL) { 335 hostp = nfsdirname; 336 nfsdirname = delimp + 1; 337 } 338 if (hostp != NULL) { 339 *delimp = '\0'; 340 getaddrinfo(hostp, NULL, &hints, &ai); 341 if (ai == NULL) { 342 warnx("can't get net id for host"); 343 } 344 } 345 346 /* 347 * Check if we have to start the rpc-call later. 348 * If there are still identical nfs-names mounted, 349 * we skip the rpc-call. Obviously this has to 350 * happen before unmount(2), but it should happen 351 * after the previous namecheck. 352 * A non-NULL return means that this is the last 353 * mount from mntfromname that is still mounted. 354 */ 355 if (getmntentry(sfs->f_mntfromname, NULL, NULL, 356 CHECKUNIQUE) != NULL) 357 do_rpc = 1; 358 } 359 360 if (!namematch(ai)) 361 return (1); 362 /* First try to unmount using the file system ID. */ 363 snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0], 364 sfs->f_fsid.val[1]); 365 if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) { 366 /* XXX, non-root users get a zero fsid, so don't warn. */ 367 if (errno != ENOENT || sfs->f_fsid.val[0] != 0 || 368 sfs->f_fsid.val[1] != 0) 369 warn("unmount of %s failed", sfs->f_mntonname); 370 if (errno != ENOENT) 371 return (1); 372 /* Compatibility for old kernels. */ 373 if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0) 374 warnx("retrying using path instead of file system ID"); 375 if (unmount(sfs->f_mntonname, fflag) != 0) { 376 warn("unmount of %s failed", sfs->f_mntonname); 377 return (1); 378 } 379 } 380 /* Mark this this file system as unmounted. */ 381 getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE); 382 if (vflag) 383 (void)printf("%s: unmount from %s\n", sfs->f_mntfromname, 384 sfs->f_mntonname); 385 /* 386 * Report to mountd-server which nfsname 387 * has been unmounted. 388 */ 389 if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) { 390 clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS, "udp"); 391 if (clp == NULL) { 392 warnx("%s: %s", hostp, 393 clnt_spcreateerror("MOUNTPROG")); 394 return (1); 395 } 396 clp->cl_auth = authsys_create_default(); 397 try.tv_sec = 20; 398 try.tv_usec = 0; 399 clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir, 400 nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try); 401 if (clnt_stat != RPC_SUCCESS) { 402 warnx("%s: %s", hostp, 403 clnt_sperror(clp, "RPCMNT_UMOUNT")); 404 return (1); 405 } 406 /* 407 * Remove the unmounted entry from /var/db/mounttab. 408 */ 409 if (read_mtab()) { 410 clean_mtab(hostp, nfsdirname, vflag); 411 if(!write_mtab(vflag)) 412 warnx("cannot remove mounttab entry %s:%s", 413 hostp, nfsdirname); 414 free_mtab(); 415 } 416 free(orignfsdirname); 417 auth_destroy(clp->cl_auth); 418 clnt_destroy(clp); 419 } 420 return (0); 421 } 422 423 struct statfs * 424 getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what) 425 { 426 static struct statfs *mntbuf; 427 static size_t mntsize = 0; 428 static char *mntcheck = NULL; 429 struct statfs *sfs, *foundsfs; 430 int i, count; 431 432 if (mntsize <= 0) { 433 if ((mntsize = mntinfo(&mntbuf)) <= 0) 434 return (NULL); 435 } 436 if (mntcheck == NULL) { 437 if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL) 438 err(1, "calloc"); 439 } 440 /* 441 * We want to get the file systems in the reverse order 442 * that they were mounted. Unmounted file systems are marked 443 * in a table called 'mntcheck'. 444 */ 445 count = 0; 446 foundsfs = NULL; 447 for (i = mntsize - 1; i >= 0; i--) { 448 if (mntcheck[i]) 449 continue; 450 sfs = &mntbuf[i]; 451 if (fromname != NULL && strcmp(sfs->f_mntfromname, 452 fromname) != 0) 453 continue; 454 if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0) 455 continue; 456 if (fsid != NULL && bcmp(&sfs->f_fsid, fsid, 457 sizeof(*fsid)) != 0) 458 continue; 459 460 switch (what) { 461 case CHECKUNIQUE: 462 foundsfs = sfs; 463 count++; 464 continue; 465 case REMOVE: 466 mntcheck[i] = 1; 467 break; 468 default: 469 break; 470 } 471 return (sfs); 472 } 473 474 if (what == CHECKUNIQUE && count == 1) 475 return (foundsfs); 476 return (NULL); 477 } 478 479 int 480 sacmp(void *sa1, void *sa2) 481 { 482 void *p1, *p2; 483 int len; 484 485 if (((struct sockaddr *)sa1)->sa_family != 486 ((struct sockaddr *)sa2)->sa_family) 487 return (1); 488 489 switch (((struct sockaddr *)sa1)->sa_family) { 490 case AF_INET: 491 p1 = &((struct sockaddr_in *)sa1)->sin_addr; 492 p2 = &((struct sockaddr_in *)sa2)->sin_addr; 493 len = 4; 494 break; 495 case AF_INET6: 496 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr; 497 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr; 498 len = 16; 499 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 500 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 501 return (1); 502 break; 503 default: 504 return (1); 505 } 506 507 return memcmp(p1, p2, len); 508 } 509 510 int 511 namematch(struct addrinfo *ai) 512 { 513 struct addrinfo *aip; 514 515 if (nfshost == NULL || nfshost_ai == NULL) 516 return (1); 517 518 while (ai != NULL) { 519 aip = nfshost_ai; 520 while (aip != NULL) { 521 if (sacmp(ai->ai_addr, aip->ai_addr) == 0) 522 return (1); 523 aip = aip->ai_next; 524 } 525 ai = ai->ai_next; 526 } 527 528 return (0); 529 } 530 531 struct statfs * 532 checkmntlist(char *mntname) 533 { 534 struct statfs *sfs; 535 fsid_t fsid; 536 537 sfs = NULL; 538 if (parsehexfsid(mntname, &fsid) == 0) 539 sfs = getmntentry(NULL, NULL, &fsid, FIND); 540 if (sfs == NULL) 541 sfs = getmntentry(NULL, mntname, NULL, FIND); 542 if (sfs == NULL) 543 sfs = getmntentry(mntname, NULL, NULL, FIND); 544 return (sfs); 545 } 546 547 size_t 548 mntinfo(struct statfs **mntbuf) 549 { 550 static struct statfs *origbuf; 551 size_t bufsize; 552 int mntsize; 553 554 mntsize = getfsstat(NULL, 0, MNT_NOWAIT); 555 if (mntsize <= 0) 556 return (0); 557 bufsize = (mntsize + 1) * sizeof(struct statfs); 558 if ((origbuf = malloc(bufsize)) == NULL) 559 err(1, "malloc"); 560 mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT); 561 *mntbuf = origbuf; 562 return (mntsize); 563 } 564 565 /* 566 * Convert a hexadecimal filesystem ID to an fsid_t. 567 * Returns 0 on success. 568 */ 569 int 570 parsehexfsid(const char *hex, fsid_t *fsid) 571 { 572 char hexbuf[3]; 573 int i; 574 575 if (strlen(hex) != sizeof(*fsid) * 2) 576 return (-1); 577 hexbuf[2] = '\0'; 578 for (i = 0; i < (int)sizeof(*fsid); i++) { 579 hexbuf[0] = hex[i * 2]; 580 hexbuf[1] = hex[i * 2 + 1]; 581 if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1])) 582 return (-1); 583 ((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16); 584 } 585 return (0); 586 } 587 588 /* 589 * xdr routines for mount rpc's 590 */ 591 int 592 xdr_dir(XDR *xdrsp, char *dirp) 593 { 594 595 return (xdr_string(xdrsp, &dirp, MNTPATHLEN)); 596 } 597 598 void 599 usage(void) 600 { 601 602 (void)fprintf(stderr, "%s\n%s\n", 603 "usage: umount [-fv] special ... | node ... | fsid ...", 604 " umount -a | -A [-F fstab] [-fv] [-h host] [-t type]"); 605 exit(1); 606 } 607