mount.c revision 1.25
1 /* $NetBSD: mount.c,v 1.25 1996/10/23 22:50:05 cgd 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 1.25 1996/10/23 22:50:05 cgd 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_NOCOREDUMP, 0, "nocoredump" }, 94 { MNT_NODEV, 0, "nodev" }, 95 { MNT_NOEXEC, 0, "noexec" }, 96 { MNT_NOSUID, 0, "nosuid" }, 97 { MNT_QUOTA, 0, "with quotas" }, 98 { MNT_RDONLY, 0, "read-only" }, 99 { MNT_ROOTFS, 1, "root file system" }, 100 { MNT_SYNCHRONOUS, 0, "synchronous" }, 101 { MNT_UNION, 0, "union" }, 102 { NULL } 103 }; 104 105 int 106 main(argc, argv) 107 int argc; 108 char * const argv[]; 109 { 110 const char *mntonname, *vfstype; 111 struct fstab *fs; 112 struct statfs *mntbuf; 113 FILE *mountdfp; 114 pid_t pid; 115 int all, ch, forceall, i, init_flags, mntsize, rval; 116 char *options; 117 118 all = forceall = init_flags = 0; 119 options = NULL; 120 vfstype = "ffs"; 121 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != EOF) 122 switch (ch) { 123 case 'A': 124 all = forceall = 1; 125 break; 126 case 'a': 127 all = 1; 128 break; 129 case 'd': 130 debug = 1; 131 break; 132 case 'f': 133 init_flags |= MNT_FORCE; 134 break; 135 case 'o': 136 if (*optarg) 137 options = catopt(options, optarg); 138 break; 139 case 'r': 140 init_flags |= MNT_RDONLY; 141 break; 142 case 't': 143 if (typelist != NULL) 144 errx(1, "only one -t option may be specified."); 145 maketypelist(optarg); 146 vfstype = optarg; 147 break; 148 case 'u': 149 init_flags |= MNT_UPDATE; 150 break; 151 case 'v': 152 verbose = 1; 153 break; 154 case 'w': 155 init_flags &= ~MNT_RDONLY; 156 break; 157 case '?': 158 default: 159 usage(); 160 /* NOTREACHED */ 161 } 162 argc -= optind; 163 argv += optind; 164 165 #define BADTYPE(type) \ 166 (strcmp(type, FSTAB_RO) && \ 167 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 168 169 rval = 0; 170 switch (argc) { 171 case 0: 172 if (all) 173 while ((fs = getfsent()) != NULL) { 174 if (BADTYPE(fs->fs_type)) 175 continue; 176 if (!selected(fs->fs_vfstype)) 177 continue; 178 if (hasopt(fs->fs_mntops, "noauto")) 179 continue; 180 if (mountfs(fs->fs_vfstype, fs->fs_spec, 181 fs->fs_file, init_flags, options, 182 fs->fs_mntops, !forceall)) 183 rval = 1; 184 } 185 else { 186 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 187 err(1, "getmntinfo"); 188 for (i = 0; i < mntsize; i++) { 189 if (!selected(mntbuf[i].f_fstypename)) 190 continue; 191 prmount(&mntbuf[i]); 192 } 193 } 194 exit(rval); 195 case 1: 196 if (typelist != NULL) 197 usage(); 198 199 if (init_flags & MNT_UPDATE) { 200 if ((mntbuf = getmntpt(*argv)) == NULL) 201 errx(1, 202 "unknown special file or file system %s.", 203 *argv); 204 if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL) 205 errx(1, "can't find fstab entry for %s.", 206 *argv); 207 /* If it's an update, ignore the fstab file options. */ 208 fs->fs_mntops = NULL; 209 mntonname = mntbuf->f_mntonname; 210 } else { 211 if ((fs = getfsfile(*argv)) == NULL && 212 (fs = getfsspec(*argv)) == NULL) 213 errx(1, 214 "%s: unknown special file or file system.", 215 *argv); 216 if (BADTYPE(fs->fs_type)) 217 errx(1, "%s has unknown file system type.", 218 *argv); 219 mntonname = fs->fs_file; 220 } 221 rval = mountfs(fs->fs_vfstype, fs->fs_spec, 222 mntonname, init_flags, options, fs->fs_mntops, 0); 223 break; 224 case 2: 225 /* 226 * If -t flag has not been specified, and spec contains either 227 * a ':' or a '@' then assume that an NFS filesystem is being 228 * specified ala Sun. 229 */ 230 if (typelist == NULL && strpbrk(argv[0], ":@") != NULL) 231 vfstype = "nfs"; 232 rval = mountfs(vfstype, 233 argv[0], argv[1], init_flags, options, NULL, 0); 234 break; 235 default: 236 usage(); 237 /* NOTREACHED */ 238 } 239 240 /* 241 * If the mount was successfully, and done by root, tell mountd the 242 * good news. Pid checks are probably unnecessary, but don't hurt. 243 */ 244 if (rval == 0 && getuid() == 0 && 245 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 246 if (fscanf(mountdfp, "%ld", &pid) == 1 && 247 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 248 err(1, "signal mountd"); 249 (void)fclose(mountdfp); 250 } 251 252 exit(rval); 253 } 254 255 int 256 hasopt(mntopts, option) 257 const char *mntopts, *option; 258 { 259 int negative, found; 260 char *opt, *optbuf; 261 262 if (option[0] == 'n' && option[1] == 'o') { 263 negative = 1; 264 option += 2; 265 } else 266 negative = 0; 267 optbuf = strdup(mntopts); 268 found = 0; 269 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 270 if (opt[0] == 'n' && opt[1] == 'o') { 271 if (!strcasecmp(opt + 2, option)) 272 found = negative; 273 } else if (!strcasecmp(opt, option)) 274 found = !negative; 275 } 276 free(optbuf); 277 return (found); 278 } 279 280 int 281 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 282 const char *vfstype, *spec, *name, *options, *mntopts; 283 int flags, skipmounted; 284 { 285 /* List of directories containing mount_xxx subcommands. */ 286 static const char *edirs[] = { 287 _PATH_SBIN, 288 _PATH_USRSBIN, 289 NULL 290 }; 291 const char *argv[100], **edir; 292 struct statfs sf; 293 pid_t pid; 294 int argc, i, status; 295 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; 296 297 if (realpath(name, mntpath) == NULL) { 298 warn("realpath %s", name); 299 return (1); 300 } 301 302 name = mntpath; 303 304 if (mntopts == NULL) 305 mntopts = ""; 306 if (options == NULL) { 307 if (*mntopts == '\0') 308 options = "rw"; 309 else { 310 options = mntopts; 311 mntopts = ""; 312 } 313 } 314 optbuf = catopt(strdup(mntopts), options); 315 316 if (strcmp(name, "/") == 0) 317 flags |= MNT_UPDATE; 318 else if (skipmounted) { 319 if (statfs(name, &sf) < 0) { 320 warn("statfs %s", name); 321 return (1); 322 } 323 /* XXX can't check f_mntfromname, thanks to mfs, union, etc. */ 324 if (strncmp(name, sf.f_mntonname, MNAMELEN) == 0 && 325 strncmp(vfstype, sf.f_fstypename, MFSNAMELEN) == 0) { 326 if (verbose) 327 (void)printf("%s on %s type %.*s: %s\n", 328 sf.f_mntfromname, sf.f_mntonname, 329 MFSNAMELEN, sf.f_fstypename, 330 "already mounted"); 331 return (0); 332 } 333 } 334 if (flags & MNT_FORCE) 335 optbuf = catopt(optbuf, "force"); 336 if (flags & MNT_RDONLY) 337 optbuf = catopt(optbuf, "ro"); 338 /* 339 * XXX 340 * The mount_mfs (newfs) command uses -o to select the 341 * optimisation mode. We don't pass the default "-o rw" 342 * for that reason. 343 */ 344 if (flags & MNT_UPDATE) 345 optbuf = catopt(optbuf, "update"); 346 347 argc = 0; 348 argv[argc++] = vfstype; 349 mangle(optbuf, &argc, argv); 350 argv[argc++] = spec; 351 argv[argc++] = name; 352 argv[argc] = NULL; 353 354 if (debug) { 355 (void)printf("exec: mount_%s", vfstype); 356 for (i = 1; i < argc; i++) 357 (void)printf(" %s", argv[i]); 358 (void)printf("\n"); 359 return (0); 360 } 361 362 switch (pid = vfork()) { 363 case -1: /* Error. */ 364 warn("vfork"); 365 free(optbuf); 366 return (1); 367 case 0: /* Child. */ 368 /* Go find an executable. */ 369 edir = edirs; 370 do { 371 (void)snprintf(execname, 372 sizeof(execname), "%s/mount_%s", *edir, vfstype); 373 execv(execname, (char * const *)argv); 374 if (errno != ENOENT) 375 warn("exec %s for %s", execname, name); 376 } while (*++edir != NULL); 377 378 if (errno == ENOENT) 379 warn("exec %s for %s", execname, name); 380 exit(1); 381 /* NOTREACHED */ 382 default: /* Parent. */ 383 free(optbuf); 384 385 if (waitpid(pid, &status, 0) < 0) { 386 warn("waitpid"); 387 return (1); 388 } 389 390 if (WIFEXITED(status)) { 391 if (WEXITSTATUS(status) != 0) 392 return (WEXITSTATUS(status)); 393 } else if (WIFSIGNALED(status)) { 394 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 395 return (1); 396 } 397 398 if (verbose) { 399 if (statfs(name, &sf) < 0) { 400 warn("statfs %s", name); 401 return (1); 402 } 403 prmount(&sf); 404 } 405 break; 406 } 407 408 return (0); 409 } 410 411 void 412 prmount(sf) 413 struct statfs *sf; 414 { 415 int flags; 416 struct opt *o; 417 int f; 418 419 (void)printf("%s on %s type %.*s", sf->f_mntfromname, sf->f_mntonname, 420 MFSNAMELEN, sf->f_fstypename); 421 422 flags = sf->f_flags & MNT_VISFLAGMASK; 423 for (f = 0, o = optnames; flags && o->o_opt; o++) 424 if (flags & o->o_opt) { 425 if (!o->o_silent) 426 (void)printf("%s%s", !f++ ? " (" : ", ", 427 o->o_name); 428 flags &= ~o->o_opt; 429 } 430 if (flags) 431 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 432 flags & (flags - 1) ? "s" : "", flags); 433 (void)printf(f ? ")\n" : "\n"); 434 } 435 436 struct statfs * 437 getmntpt(name) 438 const char *name; 439 { 440 struct statfs *mntbuf; 441 int i, mntsize; 442 443 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 444 for (i = 0; i < mntsize; i++) 445 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 446 strcmp(mntbuf[i].f_mntonname, name) == 0) 447 return (&mntbuf[i]); 448 return (NULL); 449 } 450 451 static enum { IN_LIST, NOT_IN_LIST } which; 452 453 int 454 selected(type) 455 const char *type; 456 { 457 char **av; 458 459 /* If no type specified, it's always selected. */ 460 if (typelist == NULL) 461 return (1); 462 for (av = typelist; *av != NULL; ++av) 463 if (!strncmp(type, *av, MFSNAMELEN)) 464 return (which == IN_LIST ? 1 : 0); 465 return (which == IN_LIST ? 0 : 1); 466 } 467 468 void 469 maketypelist(fslist) 470 char *fslist; 471 { 472 int i; 473 char *nextcp, **av; 474 475 if ((fslist == NULL) || (fslist[0] == '\0')) 476 errx(1, "empty type list"); 477 478 /* 479 * XXX 480 * Note: the syntax is "noxxx,yyy" for no xxx's and 481 * no yyy's, not the more intuitive "noyyy,noyyy". 482 */ 483 if (fslist[0] == 'n' && fslist[1] == 'o') { 484 fslist += 2; 485 which = NOT_IN_LIST; 486 } else 487 which = IN_LIST; 488 489 /* Count the number of types. */ 490 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) 491 ++nextcp; 492 493 /* Build an array of that many types. */ 494 if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL) 495 err(1, NULL); 496 av[0] = fslist; 497 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) { 498 *nextcp = '\0'; 499 av[i] = ++nextcp; 500 } 501 /* Terminate the array. */ 502 av[i] = NULL; 503 } 504 505 char * 506 catopt(s0, s1) 507 char *s0; 508 const char *s1; 509 { 510 size_t i; 511 char *cp; 512 513 if (s0 && *s0) { 514 i = strlen(s0) + strlen(s1) + 1 + 1; 515 if ((cp = malloc(i)) == NULL) 516 err(1, NULL); 517 (void)snprintf(cp, i, "%s,%s", s0, s1); 518 } else 519 cp = strdup(s1); 520 521 if (s0) 522 free(s0); 523 return (cp); 524 } 525 526 void 527 mangle(options, argcp, argv) 528 char *options; 529 int *argcp; 530 const char **argv; 531 { 532 char *p, *s; 533 int argc; 534 535 argc = *argcp; 536 for (s = options; (p = strsep(&s, ",")) != NULL;) 537 if (*p != '\0') 538 if (*p == '-') { 539 argv[argc++] = p; 540 p = strchr(p, '='); 541 if (p) { 542 *p = '\0'; 543 argv[argc++] = p+1; 544 } 545 } else if (strcmp(p, "rw") != 0) { 546 argv[argc++] = "-o"; 547 argv[argc++] = p; 548 } 549 550 *argcp = argc; 551 } 552 553 void 554 usage() 555 { 556 557 (void)fprintf(stderr, 558 "usage: mount %s %s\n mount %s\n mount %s\n", 559 "[-dfruvw] [-o options] [-t ffs | external_type]", 560 "special node", 561 "[-adfruvw] [-t ffs | external_type]", 562 "[-dfruvw] special | node"); 563 exit(1); 564 } 565
Indexes created Tue Sep 30 17:09:57 GMT 2025