mount.c revision 1.24
1 /* $NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 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 1.24 1995/11/18 03:34:29 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_NODEV, 0, "nodev" }, 94 { MNT_NOEXEC, 0, "noexec" }, 95 { MNT_NOSUID, 0, "nosuid" }, 96 { MNT_QUOTA, 0, "with quotas" }, 97 { MNT_RDONLY, 0, "read-only" }, 98 { MNT_ROOTFS, 1, "root file system" }, 99 { MNT_SYNCHRONOUS, 0, "synchronous" }, 100 { MNT_UNION, 0, "union" }, 101 { NULL } 102 }; 103 104 int 105 main(argc, argv) 106 int argc; 107 char * const argv[]; 108 { 109 const char *mntonname, *vfstype; 110 struct fstab *fs; 111 struct statfs *mntbuf; 112 FILE *mountdfp; 113 pid_t pid; 114 int all, ch, forceall, i, init_flags, mntsize, rval; 115 char *options; 116 117 all = forceall = init_flags = 0; 118 options = NULL; 119 vfstype = "ffs"; 120 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != EOF) 121 switch (ch) { 122 case 'A': 123 all = forceall = 1; 124 break; 125 case 'a': 126 all = 1; 127 break; 128 case 'd': 129 debug = 1; 130 break; 131 case 'f': 132 init_flags |= MNT_FORCE; 133 break; 134 case 'o': 135 if (*optarg) 136 options = catopt(options, optarg); 137 break; 138 case 'r': 139 init_flags |= MNT_RDONLY; 140 break; 141 case 't': 142 if (typelist != NULL) 143 errx(1, "only one -t option may be specified."); 144 maketypelist(optarg); 145 vfstype = optarg; 146 break; 147 case 'u': 148 init_flags |= MNT_UPDATE; 149 break; 150 case 'v': 151 verbose = 1; 152 break; 153 case 'w': 154 init_flags &= ~MNT_RDONLY; 155 break; 156 case '?': 157 default: 158 usage(); 159 /* NOTREACHED */ 160 } 161 argc -= optind; 162 argv += optind; 163 164 #define BADTYPE(type) \ 165 (strcmp(type, FSTAB_RO) && \ 166 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 167 168 rval = 0; 169 switch (argc) { 170 case 0: 171 if (all) 172 while ((fs = getfsent()) != NULL) { 173 if (BADTYPE(fs->fs_type)) 174 continue; 175 if (!selected(fs->fs_vfstype)) 176 continue; 177 if (hasopt(fs->fs_mntops, "noauto")) 178 continue; 179 if (mountfs(fs->fs_vfstype, fs->fs_spec, 180 fs->fs_file, init_flags, options, 181 fs->fs_mntops, !forceall)) 182 rval = 1; 183 } 184 else { 185 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 186 err(1, "getmntinfo"); 187 for (i = 0; i < mntsize; i++) { 188 if (!selected(mntbuf[i].f_fstypename)) 189 continue; 190 prmount(&mntbuf[i]); 191 } 192 } 193 exit(rval); 194 case 1: 195 if (typelist != NULL) 196 usage(); 197 198 if (init_flags & MNT_UPDATE) { 199 if ((mntbuf = getmntpt(*argv)) == NULL) 200 errx(1, 201 "unknown special file or file system %s.", 202 *argv); 203 if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL) 204 errx(1, "can't find fstab entry for %s.", 205 *argv); 206 /* If it's an update, ignore the fstab file options. */ 207 fs->fs_mntops = NULL; 208 mntonname = mntbuf->f_mntonname; 209 } else { 210 if ((fs = getfsfile(*argv)) == NULL && 211 (fs = getfsspec(*argv)) == NULL) 212 errx(1, 213 "%s: unknown special file or file system.", 214 *argv); 215 if (BADTYPE(fs->fs_type)) 216 errx(1, "%s has unknown file system type.", 217 *argv); 218 mntonname = fs->fs_file; 219 } 220 rval = mountfs(fs->fs_vfstype, fs->fs_spec, 221 mntonname, init_flags, options, fs->fs_mntops, 0); 222 break; 223 case 2: 224 /* 225 * If -t flag has not been specified, and spec contains either 226 * a ':' or a '@' then assume that an NFS filesystem is being 227 * specified ala Sun. 228 */ 229 if (typelist == NULL && strpbrk(argv[0], ":@") != NULL) 230 vfstype = "nfs"; 231 rval = mountfs(vfstype, 232 argv[0], argv[1], init_flags, options, NULL, 0); 233 break; 234 default: 235 usage(); 236 /* NOTREACHED */ 237 } 238 239 /* 240 * If the mount was successfully, and done by root, tell mountd the 241 * good news. Pid checks are probably unnecessary, but don't hurt. 242 */ 243 if (rval == 0 && getuid() == 0 && 244 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 245 if (fscanf(mountdfp, "%ld", &pid) == 1 && 246 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 247 err(1, "signal mountd"); 248 (void)fclose(mountdfp); 249 } 250 251 exit(rval); 252 } 253 254 int 255 hasopt(mntopts, option) 256 const char *mntopts, *option; 257 { 258 int negative, found; 259 char *opt, *optbuf; 260 261 if (option[0] == 'n' && option[1] == 'o') { 262 negative = 1; 263 option += 2; 264 } else 265 negative = 0; 266 optbuf = strdup(mntopts); 267 found = 0; 268 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 269 if (opt[0] == 'n' && opt[1] == 'o') { 270 if (!strcasecmp(opt + 2, option)) 271 found = negative; 272 } else if (!strcasecmp(opt, option)) 273 found = !negative; 274 } 275 free(optbuf); 276 return (found); 277 } 278 279 int 280 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 281 const char *vfstype, *spec, *name, *options, *mntopts; 282 int flags, skipmounted; 283 { 284 /* List of directories containing mount_xxx subcommands. */ 285 static const char *edirs[] = { 286 _PATH_SBIN, 287 _PATH_USRSBIN, 288 NULL 289 }; 290 const char *argv[100], **edir; 291 struct statfs sf; 292 pid_t pid; 293 int argc, i, status; 294 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; 295 296 if (realpath(name, mntpath) == NULL) { 297 warn("realpath %s", name); 298 return (1); 299 } 300 301 name = mntpath; 302 303 if (mntopts == NULL) 304 mntopts = ""; 305 if (options == NULL) { 306 if (*mntopts == '\0') 307 options = "rw"; 308 else { 309 options = mntopts; 310 mntopts = ""; 311 } 312 } 313 optbuf = catopt(strdup(mntopts), options); 314 315 if (strcmp(name, "/") == 0) 316 flags |= MNT_UPDATE; 317 else if (skipmounted) { 318 if (statfs(name, &sf) < 0) { 319 warn("statfs %s", name); 320 return (1); 321 } 322 /* XXX can't check f_mntfromname, thanks to mfs, union, etc. */ 323 if (strncmp(name, sf.f_mntonname, MNAMELEN) == 0 && 324 strncmp(vfstype, sf.f_fstypename, MFSNAMELEN) == 0) { 325 if (verbose) 326 (void)printf("%s on %s type %.*s: %s\n", 327 sf.f_mntfromname, sf.f_mntonname, 328 MFSNAMELEN, sf.f_fstypename, 329 "already mounted"); 330 return (0); 331 } 332 } 333 if (flags & MNT_FORCE) 334 optbuf = catopt(optbuf, "force"); 335 if (flags & MNT_RDONLY) 336 optbuf = catopt(optbuf, "ro"); 337 /* 338 * XXX 339 * The mount_mfs (newfs) command uses -o to select the 340 * optimisation mode. We don't pass the default "-o rw" 341 * for that reason. 342 */ 343 if (flags & MNT_UPDATE) 344 optbuf = catopt(optbuf, "update"); 345 346 argc = 0; 347 argv[argc++] = vfstype; 348 mangle(optbuf, &argc, argv); 349 argv[argc++] = spec; 350 argv[argc++] = name; 351 argv[argc] = NULL; 352 353 if (debug) { 354 (void)printf("exec: mount_%s", vfstype); 355 for (i = 1; i < argc; i++) 356 (void)printf(" %s", argv[i]); 357 (void)printf("\n"); 358 return (0); 359 } 360 361 switch (pid = vfork()) { 362 case -1: /* Error. */ 363 warn("vfork"); 364 free(optbuf); 365 return (1); 366 case 0: /* Child. */ 367 /* Go find an executable. */ 368 edir = edirs; 369 do { 370 (void)snprintf(execname, 371 sizeof(execname), "%s/mount_%s", *edir, vfstype); 372 execv(execname, (char * const *)argv); 373 if (errno != ENOENT) 374 warn("exec %s for %s", execname, name); 375 } while (*++edir != NULL); 376 377 if (errno == ENOENT) 378 warn("exec %s for %s", execname, name); 379 exit(1); 380 /* NOTREACHED */ 381 default: /* Parent. */ 382 free(optbuf); 383 384 if (waitpid(pid, &status, 0) < 0) { 385 warn("waitpid"); 386 return (1); 387 } 388 389 if (WIFEXITED(status)) { 390 if (WEXITSTATUS(status) != 0) 391 return (WEXITSTATUS(status)); 392 } else if (WIFSIGNALED(status)) { 393 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 394 return (1); 395 } 396 397 if (verbose) { 398 if (statfs(name, &sf) < 0) { 399 warn("statfs %s", name); 400 return (1); 401 } 402 prmount(&sf); 403 } 404 break; 405 } 406 407 return (0); 408 } 409 410 void 411 prmount(sf) 412 struct statfs *sf; 413 { 414 int flags; 415 struct opt *o; 416 int f; 417 418 (void)printf("%s on %s type %.*s", sf->f_mntfromname, sf->f_mntonname, 419 MFSNAMELEN, sf->f_fstypename); 420 421 flags = sf->f_flags & MNT_VISFLAGMASK; 422 for (f = 0, o = optnames; flags && o->o_opt; o++) 423 if (flags & o->o_opt) { 424 if (!o->o_silent) 425 (void)printf("%s%s", !f++ ? " (" : ", ", 426 o->o_name); 427 flags &= ~o->o_opt; 428 } 429 if (flags) 430 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 431 flags & (flags - 1) ? "s" : "", flags); 432 (void)printf(f ? ")\n" : "\n"); 433 } 434 435 struct statfs * 436 getmntpt(name) 437 const char *name; 438 { 439 struct statfs *mntbuf; 440 int i, mntsize; 441 442 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 443 for (i = 0; i < mntsize; i++) 444 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 445 strcmp(mntbuf[i].f_mntonname, name) == 0) 446 return (&mntbuf[i]); 447 return (NULL); 448 } 449 450 static enum { IN_LIST, NOT_IN_LIST } which; 451 452 int 453 selected(type) 454 const char *type; 455 { 456 char **av; 457 458 /* If no type specified, it's always selected. */ 459 if (typelist == NULL) 460 return (1); 461 for (av = typelist; *av != NULL; ++av) 462 if (!strncmp(type, *av, MFSNAMELEN)) 463 return (which == IN_LIST ? 1 : 0); 464 return (which == IN_LIST ? 0 : 1); 465 } 466 467 void 468 maketypelist(fslist) 469 char *fslist; 470 { 471 int i; 472 char *nextcp, **av; 473 474 if ((fslist == NULL) || (fslist[0] == '\0')) 475 errx(1, "empty type list"); 476 477 /* 478 * XXX 479 * Note: the syntax is "noxxx,yyy" for no xxx's and 480 * no yyy's, not the more intuitive "noyyy,noyyy". 481 */ 482 if (fslist[0] == 'n' && fslist[1] == 'o') { 483 fslist += 2; 484 which = NOT_IN_LIST; 485 } else 486 which = IN_LIST; 487 488 /* Count the number of types. */ 489 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) 490 ++nextcp; 491 492 /* Build an array of that many types. */ 493 if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL) 494 err(1, NULL); 495 av[0] = fslist; 496 for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) { 497 *nextcp = '\0'; 498 av[i] = ++nextcp; 499 } 500 /* Terminate the array. */ 501 av[i] = NULL; 502 } 503 504 char * 505 catopt(s0, s1) 506 char *s0; 507 const char *s1; 508 { 509 size_t i; 510 char *cp; 511 512 if (s0 && *s0) { 513 i = strlen(s0) + strlen(s1) + 1 + 1; 514 if ((cp = malloc(i)) == NULL) 515 err(1, NULL); 516 (void)snprintf(cp, i, "%s,%s", s0, s1); 517 } else 518 cp = strdup(s1); 519 520 if (s0) 521 free(s0); 522 return (cp); 523 } 524 525 void 526 mangle(options, argcp, argv) 527 char *options; 528 int *argcp; 529 const char **argv; 530 { 531 char *p, *s; 532 int argc; 533 534 argc = *argcp; 535 for (s = options; (p = strsep(&s, ",")) != NULL;) 536 if (*p != '\0') 537 if (*p == '-') { 538 argv[argc++] = p; 539 p = strchr(p, '='); 540 if (p) { 541 *p = '\0'; 542 argv[argc++] = p+1; 543 } 544 } else if (strcmp(p, "rw") != 0) { 545 argv[argc++] = "-o"; 546 argv[argc++] = p; 547 } 548 549 *argcp = argc; 550 } 551 552 void 553 usage() 554 { 555 556 (void)fprintf(stderr, 557 "usage: mount %s %s\n mount %s\n mount %s\n", 558 "[-dfruvw] [-o options] [-t ffs | external_type]", 559 "special node", 560 "[-adfruvw] [-t ffs | external_type]", 561 "[-dfruvw] special | node"); 562 exit(1); 563 } 564
Indexes created Mon Sep 29 21:09:56 GMT 2025