mount.c revision 1.47
1 /* $NetBSD: mount.c,v 1.47 1999/11/16 11:53:17 enami 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 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) 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 8.25 (Berkeley) 5/8/95"; 45 #else 46 __RCSID("$NetBSD: mount.c,v 1.47 1999/11/16 11:53:17 enami 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 <pwd.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include "pathnames.h" 65 66 int debug, verbose; 67 68 int checkvfsname __P((const char *, const char **)); 69 void catopt __P((char **, const char *)); 70 struct statfs 71 *getmntpt __P((const char *)); 72 int hasopt __P((const char *, const char *)); 73 const char 74 **makevfslist __P((char *)); 75 static void 76 mangle __P((char *, int *, const char ***, int *)); 77 int mountfs __P((const char *, const char *, const char *, 78 int, const char *, const char *, int)); 79 void prmount __P((struct statfs *)); 80 void usage __P((void)); 81 int main __P((int, char *[])); 82 83 /* Map from mount otions to printable formats. */ 84 static struct opt { 85 int o_opt; 86 int o_silent; 87 const char *o_name; 88 } optnames[] = { 89 { MNT_ASYNC, 0, "asynchronous" }, 90 { MNT_DEFEXPORTED, 1, "exported to the world" }, 91 { MNT_EXKERB, 1, "kerberos uid mapping" }, 92 { MNT_EXPORTED, 0, "NFS exported" }, 93 { MNT_EXPORTANON, 1, "anon uid mapping" }, 94 { MNT_EXRDONLY, 1, "exported read-only" }, 95 { MNT_LOCAL, 0, "local" }, 96 { MNT_NOATIME, 0, "noatime" }, 97 { MNT_NOCOREDUMP, 0, "nocoredump" }, 98 { MNT_NODEV, 0, "nodev" }, 99 { MNT_NODEVMTIME, 0, "nodevmtime" }, 100 { MNT_NOEXEC, 0, "noexec" }, 101 { MNT_NOSUID, 0, "nosuid" }, 102 { MNT_QUOTA, 0, "with quotas" }, 103 { MNT_RDONLY, 0, "read-only" }, 104 { MNT_ROOTFS, 1, "root file system" }, 105 { MNT_SYMPERM, 0, "symperm" }, 106 { MNT_SYNCHRONOUS, 0, "synchronous" }, 107 { MNT_UNION, 0, "union" }, 108 { MNT_SOFTDEP, 0, "soft dependencies" }, 109 { 0 } 110 }; 111 112 static char ffs_fstype[] = "ffs"; 113 114 int 115 main(argc, argv) 116 int argc; 117 char *argv[]; 118 { 119 const char *mntfromname, *mntonname, **vfslist, *vfstype; 120 struct fstab *fs; 121 struct statfs *mntbuf; 122 FILE *mountdfp; 123 int all, ch, forceall, i, init_flags, mntsize, rval; 124 char *options; 125 const char *mountopts, *fstypename; 126 127 all = forceall = init_flags = 0; 128 options = NULL; 129 vfslist = NULL; 130 vfstype = ffs_fstype; 131 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 132 switch (ch) { 133 case 'A': 134 all = forceall = 1; 135 break; 136 case 'a': 137 all = 1; 138 break; 139 case 'd': 140 debug = 1; 141 break; 142 case 'f': 143 init_flags |= MNT_FORCE; 144 break; 145 case 'o': 146 if (*optarg) 147 catopt(&options, optarg); 148 break; 149 case 'r': 150 init_flags |= MNT_RDONLY; 151 break; 152 case 't': 153 if (vfslist != NULL) 154 errx(1, "only one -t option may be specified."); 155 vfslist = makevfslist(optarg); 156 vfstype = optarg; 157 break; 158 case 'u': 159 init_flags |= MNT_UPDATE; 160 break; 161 case 'v': 162 verbose = 1; 163 break; 164 case 'w': 165 init_flags &= ~MNT_RDONLY; 166 break; 167 case '?': 168 default: 169 usage(); 170 /* NOTREACHED */ 171 } 172 argc -= optind; 173 argv += optind; 174 175 #define BADTYPE(type) \ 176 (strcmp(type, FSTAB_RO) && \ 177 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 178 179 rval = 0; 180 switch (argc) { 181 case 0: 182 if (all) 183 while ((fs = getfsent()) != NULL) { 184 if (BADTYPE(fs->fs_type)) 185 continue; 186 if (checkvfsname(fs->fs_vfstype, vfslist)) 187 continue; 188 if (hasopt(fs->fs_mntops, "noauto")) 189 continue; 190 if (mountfs(fs->fs_vfstype, fs->fs_spec, 191 fs->fs_file, init_flags, options, 192 fs->fs_mntops, !forceall)) 193 rval = 1; 194 } 195 else { 196 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 197 err(1, "getmntinfo"); 198 for (i = 0; i < mntsize; i++) { 199 if (checkvfsname(mntbuf[i].f_fstypename, 200 vfslist)) 201 continue; 202 prmount(&mntbuf[i]); 203 } 204 } 205 exit(rval); 206 /* NOTREACHED */ 207 case 1: 208 if (vfslist != NULL) { 209 usage(); 210 /* NOTREACHED */ 211 } 212 213 if (init_flags & MNT_UPDATE) { 214 if ((mntbuf = getmntpt(*argv)) == NULL) 215 errx(1, 216 "unknown special file or file system %s.", 217 *argv); 218 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 219 mntfromname = fs->fs_spec; 220 /* ignore the fstab file options. */ 221 fs->fs_mntops = NULL; 222 } else 223 mntfromname = mntbuf->f_mntfromname; 224 mntonname = mntbuf->f_mntonname; 225 fstypename = mntbuf->f_fstypename; 226 mountopts = NULL; 227 } else { 228 if ((fs = getfsfile(*argv)) == NULL && 229 (fs = getfsspec(*argv)) == NULL) 230 errx(1, 231 "%s: unknown special file or file system.", 232 *argv); 233 if (BADTYPE(fs->fs_type)) 234 errx(1, "%s has unknown file system type.", 235 *argv); 236 mntfromname = fs->fs_spec; 237 mntonname = fs->fs_file; 238 fstypename = fs->fs_vfstype; 239 mountopts = fs->fs_mntops; 240 } 241 rval = mountfs(fstypename, mntfromname, 242 mntonname, init_flags, options, mountopts, 0); 243 break; 244 case 2: 245 /* 246 * If -t flag has not been specified, and spec contains either 247 * a ':' or a '@' then assume that an NFS filesystem is being 248 * specified ala Sun. 249 */ 250 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL) 251 vfstype = "nfs"; 252 rval = mountfs(vfstype, 253 argv[0], argv[1], init_flags, options, NULL, 0); 254 break; 255 default: 256 usage(); 257 /* NOTREACHED */ 258 } 259 260 /* 261 * If the mount was successfully, and done by root, tell mountd the 262 * good news. Pid checks are probably unnecessary, but don't hurt. 263 */ 264 if (rval == 0 && getuid() == 0 && 265 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 266 int pid; 267 268 if (fscanf(mountdfp, "%d", &pid) == 1 && 269 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 270 err(1, "signal mountd"); 271 (void)fclose(mountdfp); 272 } 273 274 exit(rval); 275 /* NOTREACHED */ 276 } 277 278 int 279 hasopt(mntopts, option) 280 const char *mntopts, *option; 281 { 282 int negative, found; 283 char *opt, *optbuf; 284 285 if (option[0] == 'n' && option[1] == 'o') { 286 negative = 1; 287 option += 2; 288 } else 289 negative = 0; 290 optbuf = strdup(mntopts); 291 found = 0; 292 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 293 if (opt[0] == 'n' && opt[1] == 'o') { 294 if (!strcasecmp(opt + 2, option)) 295 found = negative; 296 } else if (!strcasecmp(opt, option)) 297 found = !negative; 298 } 299 free(optbuf); 300 return (found); 301 } 302 303 int 304 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 305 const char *vfstype, *spec, *name, *options, *mntopts; 306 int flags, skipmounted; 307 { 308 /* List of directories containing mount_xxx subcommands. */ 309 static const char *edirs[] = { 310 _PATH_SBIN, 311 _PATH_USRSBIN, 312 NULL 313 }; 314 const char **argv, **edir; 315 struct statfs *sfp, sf; 316 pid_t pid; 317 int argc, numfs, i, status, maxargc; 318 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 319 mntpath[MAXPATHLEN]; 320 321 #ifdef __GNUC__ 322 (void) &name; 323 (void) &optbuf; 324 (void) &vfstype; 325 #endif 326 327 if (realpath(name, mntpath) == NULL) { 328 warn("realpath %s", name); 329 return (1); 330 } 331 332 name = mntpath; 333 334 optbuf = NULL; 335 if (mntopts) 336 catopt(&optbuf, mntopts); 337 if (options) 338 catopt(&optbuf, options); 339 if (!mntopts && !options) 340 catopt(&optbuf, "rw"); 341 342 if (!strcmp(name, "/")) 343 flags |= MNT_UPDATE; 344 else if (skipmounted) { 345 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 346 warn("getmntinfo"); 347 return (1); 348 } 349 for(i = 0; i < numfs; i++) { 350 /* XXX can't check f_mntfromname, 351 thanks to mfs, union, etc. */ 352 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 353 strncmp(vfstype, sfp[i].f_fstypename, 354 MFSNAMELEN) == 0) { 355 if (verbose) 356 (void)printf("%s on %s type %.*s: %s\n", 357 sfp[i].f_mntfromname, 358 sfp[i].f_mntonname, 359 MFSNAMELEN, 360 sfp[i].f_fstypename, 361 "already mounted"); 362 return (0); 363 } 364 } 365 } 366 if (flags & MNT_FORCE) 367 catopt(&optbuf, "force"); 368 if (flags & MNT_RDONLY) 369 catopt(&optbuf, "ro"); 370 371 if (flags & MNT_UPDATE) { 372 catopt(&optbuf, "update"); 373 /* Figure out the fstype only if we defaulted to ffs */ 374 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 375 vfstype = sf.f_fstypename; 376 } 377 378 maxargc = 64; 379 argv = malloc(sizeof(char *) * maxargc); 380 381 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 382 argc = 0; 383 argv[argc++] = execbase; 384 if (optbuf) 385 mangle(optbuf, &argc, &argv, &maxargc); 386 argv[argc++] = spec; 387 argv[argc++] = name; 388 argv[argc] = NULL; 389 390 if (verbose) { 391 (void)printf("exec:"); 392 for (i = 0; i < argc; i++) 393 (void)printf(" %s", argv[i]); 394 (void)printf("\n"); 395 } 396 397 switch (pid = vfork()) { 398 case -1: /* Error. */ 399 warn("vfork"); 400 if (optbuf) 401 free(optbuf); 402 return (1); 403 404 case 0: /* Child. */ 405 if (debug) 406 _exit(0); 407 408 /* Go find an executable. */ 409 edir = edirs; 410 do { 411 (void)snprintf(execname, 412 sizeof(execname), "%s/%s", *edir, execbase); 413 (void)execv(execname, (char * const *)argv); 414 if (errno != ENOENT) 415 warn("exec %s for %s", execname, name); 416 } while (*++edir != NULL); 417 418 if (errno == ENOENT) 419 warnx("%s not found for %s", execbase, name); 420 _exit(1); 421 /* NOTREACHED */ 422 423 default: /* Parent. */ 424 if (optbuf) 425 free(optbuf); 426 427 if (waitpid(pid, &status, 0) < 0) { 428 warn("waitpid"); 429 return (1); 430 } 431 432 if (WIFEXITED(status)) { 433 if (WEXITSTATUS(status) != 0) 434 return (WEXITSTATUS(status)); 435 } else if (WIFSIGNALED(status)) { 436 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 437 return (1); 438 } 439 440 if (verbose) { 441 if (statfs(name, &sf) < 0) { 442 warn("statfs %s", name); 443 return (1); 444 } 445 prmount(&sf); 446 } 447 break; 448 } 449 450 return (0); 451 } 452 453 void 454 prmount(sfp) 455 struct statfs *sfp; 456 { 457 int flags; 458 struct opt *o; 459 struct passwd *pw; 460 int f; 461 462 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, sfp->f_mntonname, 463 MFSNAMELEN, sfp->f_fstypename); 464 465 flags = sfp->f_flags & MNT_VISFLAGMASK; 466 for (f = 0, o = optnames; flags && o->o_opt; o++) 467 if (flags & o->o_opt) { 468 if (!o->o_silent) 469 (void)printf("%s%s", !f++ ? " (" : ", ", 470 o->o_name); 471 flags &= ~o->o_opt; 472 } 473 if (flags) 474 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 475 flags & (flags - 1) ? "s" : "", flags); 476 if (sfp->f_owner) { 477 (void)printf("%smounted by ", !f++ ? " (" : ", "); 478 if ((pw = getpwuid(sfp->f_owner)) != NULL) 479 (void)printf("%s", pw->pw_name); 480 else 481 (void)printf("%d", sfp->f_owner); 482 } 483 if (verbose) 484 (void)printf("%swrites: sync %ld async %ld)\n", 485 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 486 else 487 (void)printf(f ? ")\n" : "\n"); 488 } 489 490 struct statfs * 491 getmntpt(name) 492 const char *name; 493 { 494 struct statfs *mntbuf; 495 int i, mntsize; 496 497 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 498 for (i = 0; i < mntsize; i++) 499 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 500 strcmp(mntbuf[i].f_mntonname, name) == 0) 501 return (&mntbuf[i]); 502 return (NULL); 503 } 504 505 void 506 catopt(sp, o) 507 char **sp; 508 const char *o; 509 { 510 char *s; 511 size_t i, j; 512 513 s = *sp; 514 if (s) { 515 i = strlen(s); 516 j = i + 1 + strlen(o) + 1; 517 s = realloc(s, j); 518 (void)snprintf(s + i, j, ",%s", o); 519 } else 520 s = strdup(o); 521 *sp = s; 522 } 523 524 static void 525 mangle(options, argcp, argvp, maxargcp) 526 char *options; 527 int *argcp, *maxargcp; 528 const char ***argvp; 529 { 530 char *p, *s; 531 int argc, maxargc; 532 const char **argv; 533 534 argc = *argcp; 535 argv = *argvp; 536 maxargc = *maxargcp; 537 538 for (s = options; (p = strsep(&s, ",")) != NULL;) { 539 /* Always leave space for one more argument and the NULL. */ 540 if (argc >= maxargc - 4) { 541 maxargc <<= 1; 542 argv = realloc(argv, maxargc * sizeof(char *)); 543 } 544 if (*p != '\0') { 545 if (*p == '-') { 546 argv[argc++] = p; 547 p = strchr(p, '='); 548 if (p) { 549 *p = '\0'; 550 argv[argc++] = p+1; 551 } 552 } else if (strcmp(p, "rw") != 0) { 553 argv[argc++] = "-o"; 554 argv[argc++] = p; 555 } 556 } 557 } 558 559 *argcp = argc; 560 *argvp = argv; 561 *maxargcp = maxargc; 562 } 563 564 void 565 usage() 566 { 567 568 (void)fprintf(stderr, 569 "usage: mount %s %s\n mount %s\n mount %s\n", 570 "[-dfruvw] [-o options] [-t ffs | external_type]", 571 "special node", 572 "[-adfruvw] [-t ffs | external_type]", 573 "[-dfruvw] special | node"); 574 exit(1); 575 /* NOTREACHED */ 576 } 577
Indexes created Tue Sep 30 20:09:53 GMT 2025