mount.c revision 1.26
1 /* $NetBSD: mount.c,v 1.26 1997/03/10 03:59:54 mikel 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 #ifndef lint 37 static char copyright[] = 38 "@(#) 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 8.19 (Berkeley) 4/19/94"; 45 #else 46 static char rcsid[] = "$NetBSD: mount.c,v 1.26 1997/03/10 03:59:54 mikel 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 <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 #include "pathnames.h" 64 65 int debug, verbose; 66 char **typelist = NULL; 67 68 int selected __P((const char *)); 69 char *catopt __P((char *, const char *)); 70 struct statfs 71 *getmntpt __P((const char *)); 72 int hasopt __P((const char *, const char *)); 73 void maketypelist __P((char *)); 74 void mangle __P((char *, int *, const char **)); 75 int mountfs __P((const char *, const char *, const char *, 76 int, const char *, const char *, int)); 77 void prmount __P((struct statfs *)); 78 void usage __P((void)); 79 80 /* Map from mount otions to printable formats. */ 81 static struct opt { 82 int o_opt; 83 int o_silent; 84 const char *o_name; 85 } optnames[] = { 86 { MNT_ASYNC, 0, "asynchronous" }, 87 { MNT_DEFEXPORTED, 1, "exported to the world" }, 88 { MNT_EXKERB, 1, "kerberos uid mapping" }, 89 { MNT_EXPORTED, 0, "NFS exported" }, 90 { MNT_EXPORTANON, 1, "anon uid mapping" }, 91 { MNT_EXRDONLY, 1, "exported read-only" }, 92 { MNT_LOCAL, 0, "local" }, 93 { MNT_NOATIME, 0, "noatime" }, 94 { MNT_NOCOREDUMP, 0, "nocoredump" }, 95 { MNT_NODEV, 0, "nodev" }, 96 { MNT_NOEXEC, 0, "noexec" }, 97 { MNT_NOSUID, 0, "nosuid" }, 98 { MNT_QUOTA, 0, "with quotas" }, 99 { MNT_RDONLY, 0, "read-only" }, 100 { MNT_ROOTFS, 1, "root file system" }, 101 { MNT_SYNCHRONOUS, 0, "synchronous" }, 102 { MNT_UNION, 0, "union" }, 103 { NULL } 104 }; 105 106 int 107 main(argc, argv) 108 int argc; 109 char * const argv[]; 110 { 111 const char *mntonname, *vfstype; 112 struct fstab *fs; 113 struct statfs *mntbuf; 114 FILE *mountdfp; 115 pid_t pid; 116 int all, ch, forceall, i, init_flags, mntsize, rval; 117 char *options; 118 119 all = forceall = init_flags = 0; 120 options = NULL; 121 vfstype = "ffs"; 122 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != EOF) 123 switch (ch) { 124 case 'A': 125 all = forceall = 1; 126 break; 127 case 'a': 128 all = 1; 129 break; 130 case 'd': 131 debug = 1; 132 break; 133 case 'f': 134 init_flags |= MNT_FORCE; 135 break; 136 case 'o': 137 if (*optarg) 138 options = catopt(options, optarg); 139 break; 140 case 'r': 141 init_flags |= MNT_RDONLY; 142 break; 143 case 't': 144 if (typelist != NULL) 145 errx(1, "only one -t option may be specified."); 146 maketypelist(optarg); 147 vfstype = optarg; 148 break; 149 case 'u': 150 init_flags |= MNT_UPDATE; 151 break; 152 case 'v': 153 verbose = 1; 154 break; 155 case 'w': 156 init_flags &= ~MNT_RDONLY; 157 break; 158 case '?': 159 default: 160 usage(); 161 /* NOTREACHED */ 162 } 163 argc -= optind; 164 argv += optind; 165 166 #define BADTYPE(type) \ 167 (strcmp(type, FSTAB_RO) && \ 168 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 169 170 rval = 0; 171 switch (argc) { 172 case 0: 173 if (all) 174 while ((fs = getfsent()) != NULL) { 175 if (BADTYPE(fs->fs_type)) 176 continue; 177 if (!selected(fs->fs_vfstype)) 178 continue; 179 if (hasopt(fs->fs_mntops, "noauto")) 180 continue; 181 if (mountfs(fs->fs_vfstype, fs->fs_spec, 182 fs->fs_file, init_flags, options, 183 fs->fs_mntops, !forceall)) 184 rval = 1; 185 } 186 else { 187 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 188 err(1, "getmntinfo"); 189 for (i = 0; i < mntsize; i++) { 190 if (!selected(mntbuf[i].f_fstypename)) 191 continue; 192 prmount(&mntbuf[i]); 193 } 194 } 195 exit(rval); 196 case 1: 197 if (typelist != NULL) 198 usage(); 199 200 if (init_flags & MNT_UPDATE) { 201 if ((mntbuf = getmntpt(*argv)) == NULL) 202 errx(1, 203 "unknown special file or file system %s.", 204 *argv); 205 if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL) 206 errx(1, "can't find fstab entry for %s.", 207 *argv); 208 /* If it's an update, ignore the fstab file options. */ 209 fs->fs_mntops = NULL; 210 mntonname = mntbuf->f_mntonname; 211 } else { 212 if ((fs = getfsfile(*argv)) == NULL && 213 (fs = getfsspec(*argv)) == NULL) 214 errx(1, 215 "%s: unknown special file or file system.", 216 *argv); 217 if (BADTYPE(fs->fs_type)) 218 errx(1, "%s has unknown file system type.", 219 *argv); 220 mntonname = fs->fs_file; 221 } 222 rval = mountfs(fs->fs_vfstype, fs->fs_spec, 223 mntonname, init_flags, options, fs->fs_mntops, 0); 224 break; 225 case 2: 226 /* 227 * If -t flag has not been specified, and spec contains either 228 * a ':' or a '@' then assume that an NFS filesystem is being 229 * specified ala Sun. 230 */ 231 if (typelist == NULL && strpbrk(argv[0], ":@") != NULL) 232 vfstype = "nfs"; 233 rval = mountfs(vfstype, 234 argv[0], argv[1], init_flags, options, NULL, 0); 235 break; 236 default: 237 usage(); 238 /* NOTREACHED */ 239 } 240 241 /* 242 * If the mount was successfully, and done by root, tell mountd the 243 * good news. Pid checks are probably unnecessary, but don't hurt. 244 */ 245 if (rval == 0 && getuid() == 0 && 246 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 247 if (fscanf(mountdfp, "%ld", &pid) == 1 && 248 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 249 err(1, "signal mountd"); 250 (void)fclose(mountdfp); 251 } 252 253 exit(rval); 254 } 255 256 int 257 hasopt(mntopts, option) 258 const char *mntopts, *option; 259 { 260 int negative, found; 261 char *opt, *optbuf; 262 263 if (option[0] == 'n' && option[1] == 'o') { 264 negative = 1; 265 option += 2; 266 } else 267 negative = 0; 268 optbuf = strdup(mntopts); 269 found = 0; 270 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 271 if (opt[0] == 'n' && opt[1] == 'o') { 272 if (!strcasecmp(opt + 2, option)) 273 found = negative; 274 } else if (!strcasecmp(opt, option)) 275 found = !negative; 276 } 277 free(optbuf); 278 return (found); 279 } 280 281 int 282 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 283 const char *vfstype, *spec, *name, *options, *mntopts; 284 int flags, skipmounted; 285 { 286 /* List of directories containing mount_xxx subcommands. */ 287 static const char *edirs[] = { 288 _PATH_SBIN, 289 _PATH_USRSBIN, 290 NULL 291 }; 292 const char *argv[100], **edir; 293 struct statfs sf; 294 pid_t pid; 295 int argc, i, status; 296 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; 297 298 if (realpath(name, mntpath) == NULL) { 299 warn("realpath %s", name); 300 return (1); 301 } 302 303 name = mntpath; 304 305 if (mntopts == NULL) 306 mntopts = ""; 307 if (options == NULL) { 308 if (*mntopts == '\0') 309 options = "rw"; 310 else { 311 options = mntopts; 312 mntopts = ""; 313 } 314 } 315 optbuf = catopt(strdup(mntopts), options); 316 317 if (strcmp(name, "/") == 0) 318 flags |= MNT_UPDATE; 319 else if (skipmounted) { 320 if (statfs(name, &sf) < 0) { 321 warn("statfs %s", name); 322 return (1); 323 } 324 /* XXX can't check f_mntfromname, thanks to mfs, union, etc. */ 325 if (strncmp(name, sf.f_mntonname, MNAMELEN) == 0 && 326 strncmp(vfstype, sf.f_fstypename, MFSNAMELEN) == 0) { 327 if (verbose) 328 (void)printf("%s on %s type %.*s: %s\n", 329 sf.f_mntfromname, sf.f_mntonname, 330 MFSNAMELEN, sf.f_fstypename, 331 "already mounted"); 332 return (0); 333 } 334 } 335 if (flags & MNT_FORCE) 336 optbuf = catopt(optbuf, "force"); 337 if (flags & MNT_RDONLY) 338 optbuf = catopt(optbuf, "ro"); 339 /* 340 * XXX 341 * The mount_mfs (newfs) command uses -o to select the 342 * optimisation mode. We don't pass the default "-o rw" 343 * for that reason. 344 */ 345 if (flags & MNT_UPDATE) 346 optbuf = catopt(optbuf, "update"); 347 348 argc = 0; 349 argv[argc++] = vfstype; 350 mangle(optbuf, &argc, argv); 351 argv[argc++] = spec; 352 argv[argc++] = name; 353 argv[argc] = NULL; 354 355 if (debug) { 356 (void)printf("exec: mount_%s", vfstype); 357 for (i = 1; i < argc; i++) 358 (void)printf(" %s", argv[i]); 359 (void)printf("\n"); 360 return (0); 361 } 362 363 switch (pid = vfork()) { 364 case -1: /* Error. */ 365 warn("vfork"); 366 free(optbuf); 367 return (1); 368 case 0: /* Child. */ 369 /* Go find an executable. */ 370 edir = edirs; 371 do { 372 (void)snprintf(execname, 373 sizeof(execname), "%s/mount_%s", *edir, vfstype); 374 execv(execname, (char * const *)argv); 375 if (errno != ENOENT) 376 warn("exec %s for %s", execname, name); 377 } while (*++edir != NULL); 378 379 if (errno == ENOENT) 380 warn("exec %s for %s", execname, name); 381 exit(1); 382 /* NOTREACHED */ 383 default: /* Parent. */ 384 free(optbuf); 385 386 if (waitpid(pid, &status, 0) < 0) { 387 warn("waitpid"); 388 return (1); 389 } 390 391 if (WIFEXITED(status)) { 392 if (WEXITSTATUS(status) != 0) 393 return (WEXITSTATUS(status)); 394 } else if (WIFSIGNALED(status)) { 395 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 396 return (1); 397 } 398 399 if (verbose) { 400 if (statfs(name, &sf) < 0) { 401 warn("statfs %s", name); 402 return (1); 403 } 404 prmount(&sf); 405 } 406 break; 407 } 408 409 return (0); 410 } 411 412 void 413 prmount(sf) 414 struct statfs *sf; 415 { 416 int flags; 417 struct opt *o; 418 int f; 419 420 (void)printf("%s on %s type %.*s", sf->f_mntfromname, sf->f_mntonname, 421 MFSNAMELEN, sf->f_fstypename); 422 423 flags = sf->f_flags & MNT_VISFLAGMASK; 424 for (f = 0, o = optnames; flags && o->o_opt; o++) 425 if (flags & o->o_opt) { 426 if (!o->o_silent) 427 (void)printf("%s%s", !f++ ? " (" : ", ", 428 o->o_name); 429 flags &= ~o->o_opt; 430 } 431 if (flags) 432 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 433 flags & (flags - 1) ? "s" : "", flags); 434 (void)printf(f ? ")\n" : "\n"); 435 } 436 437 struct statfs * 438 getmntpt(name) 439 const char *name; 440 { 441 struct statfs *mntbuf; 442 int i, mntsize; 443 444 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 445 for (i = 0; i < mntsize; i++) 446 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 447 strcmp(mntbuf[i].f_mntonname, name) == 0) 448 return (&mntbuf[i]); 449 return (NULL); 450 } 451 452 static enum { IN_LIST, NOT_IN_LIST } which; 453 454 int 455 selected(type) 456 const char *type; 457 { 458 char **av; 459 460 /* If no type specified, it's always selected. */ 461 if (typelist == NULL) 462 return (1); 463 for (av = typelist; *av != NULL; ++av) 464 if (!strncmp(type, *av, MFSNAMELEN)) 465 return (which == IN_LIST ? 1 : 0); 466 return (which == IN_LIST ? 0 : 1); 467 } 468 469 void 470 maketypelist(fslist) 471 char *fslist; 472 { 473 int i; 474 char *nextcp, **av; 475 476 if ((fslist == NULL) || (fslist[0] == '\0')) 477 errx(1, "empty type list"); 478 479 /* 480 * XXX 481 * Note: the syntax is "noxxx,yyy" for no xxx's and 482 * no yyy's, not the more intuitive "noyyy,noyyy". 483 */ 484 if (fslist[0] == 'n' && fslist[1] == 'o') { 485 fslist += 2; 486 which = NOT_IN_LIST; 487 } else 488 which = IN_LIST; 489 490 /* Count the number of types. */ 491 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) 492 ++nextcp; 493 494 /* Build an array of that many types. */ 495 if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL) 496 err(1, NULL); 497 av[0] = fslist; 498 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) { 499 *nextcp = '\0'; 500 av[i] = ++nextcp; 501 } 502 /* Terminate the array. */ 503 av[i] = NULL; 504 } 505 506 char * 507 catopt(s0, s1) 508 char *s0; 509 const char *s1; 510 { 511 size_t i; 512 char *cp; 513 514 if (s0 && *s0) { 515 i = strlen(s0) + strlen(s1) + 1 + 1; 516 if ((cp = malloc(i)) == NULL) 517 err(1, NULL); 518 (void)snprintf(cp, i, "%s,%s", s0, s1); 519 } else 520 cp = strdup(s1); 521 522 if (s0) 523 free(s0); 524 return (cp); 525 } 526 527 void 528 mangle(options, argcp, argv) 529 char *options; 530 int *argcp; 531 const char **argv; 532 { 533 char *p, *s; 534 int argc; 535 536 argc = *argcp; 537 for (s = options; (p = strsep(&s, ",")) != NULL;) 538 if (*p != '\0') 539 if (*p == '-') { 540 argv[argc++] = p; 541 p = strchr(p, '='); 542 if (p) { 543 *p = '\0'; 544 argv[argc++] = p+1; 545 } 546 } else if (strcmp(p, "rw") != 0) { 547 argv[argc++] = "-o"; 548 argv[argc++] = p; 549 } 550 551 *argcp = argc; 552 } 553 554 void 555 usage() 556 { 557 558 (void)fprintf(stderr, 559 "usage: mount %s %s\n mount %s\n mount %s\n", 560 "[-dfruvw] [-o options] [-t ffs | external_type]", 561 "special node", 562 "[-adfruvw] [-t ffs | external_type]", 563 "[-dfruvw] special | node"); 564 exit(1); 565 } 566
Indexes created Mon Sep 29 21:09:56 GMT 2025