mount.c revision 1.45
1 /* $NetBSD: mount.c,v 1.45 1998/12/01 23:20:43 kenh 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 1.45 1998/12/01 23:20:43 kenh 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 { 0 } 109 }; 110 111 static char ffs_fstype[] = "ffs"; 112 113 int 114 main(argc, argv) 115 int argc; 116 char *argv[]; 117 { 118 const char *mntfromname, *mntonname, **vfslist, *vfstype; 119 struct fstab *fs; 120 struct statfs *mntbuf; 121 FILE *mountdfp; 122 int all, ch, forceall, i, init_flags, mntsize, rval; 123 char *options; 124 const char *mountopts, *fstypename; 125 126 all = forceall = init_flags = 0; 127 options = NULL; 128 vfslist = NULL; 129 vfstype = ffs_fstype; 130 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 131 switch (ch) { 132 case 'A': 133 all = forceall = 1; 134 break; 135 case 'a': 136 all = 1; 137 break; 138 case 'd': 139 debug = 1; 140 break; 141 case 'f': 142 init_flags |= MNT_FORCE; 143 break; 144 case 'o': 145 if (*optarg) 146 catopt(&options, optarg); 147 break; 148 case 'r': 149 init_flags |= MNT_RDONLY; 150 break; 151 case 't': 152 if (vfslist != NULL) 153 errx(1, "only one -t option may be specified."); 154 vfslist = makevfslist(optarg); 155 vfstype = optarg; 156 break; 157 case 'u': 158 init_flags |= MNT_UPDATE; 159 break; 160 case 'v': 161 verbose = 1; 162 break; 163 case 'w': 164 init_flags &= ~MNT_RDONLY; 165 break; 166 case '?': 167 default: 168 usage(); 169 /* NOTREACHED */ 170 } 171 argc -= optind; 172 argv += optind; 173 174 #define BADTYPE(type) \ 175 (strcmp(type, FSTAB_RO) && \ 176 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 177 178 rval = 0; 179 switch (argc) { 180 case 0: 181 if (all) 182 while ((fs = getfsent()) != NULL) { 183 if (BADTYPE(fs->fs_type)) 184 continue; 185 if (checkvfsname(fs->fs_vfstype, vfslist)) 186 continue; 187 if (hasopt(fs->fs_mntops, "noauto")) 188 continue; 189 if (mountfs(fs->fs_vfstype, fs->fs_spec, 190 fs->fs_file, init_flags, options, 191 fs->fs_mntops, !forceall)) 192 rval = 1; 193 } 194 else { 195 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 196 err(1, "getmntinfo"); 197 for (i = 0; i < mntsize; i++) { 198 if (checkvfsname(mntbuf[i].f_fstypename, 199 vfslist)) 200 continue; 201 prmount(&mntbuf[i]); 202 } 203 } 204 exit(rval); 205 /* NOTREACHED */ 206 case 1: 207 if (vfslist != NULL) { 208 usage(); 209 /* NOTREACHED */ 210 } 211 212 if (init_flags & MNT_UPDATE) { 213 if ((mntbuf = getmntpt(*argv)) == NULL) 214 errx(1, 215 "unknown special file or file system %s.", 216 *argv); 217 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 218 mntfromname = fs->fs_spec; 219 /* ignore the fstab file options. */ 220 fs->fs_mntops = NULL; 221 } else 222 mntfromname = mntbuf->f_mntfromname; 223 mntonname = mntbuf->f_mntonname; 224 fstypename = mntbuf->f_fstypename; 225 mountopts = NULL; 226 } else { 227 if ((fs = getfsfile(*argv)) == NULL && 228 (fs = getfsspec(*argv)) == NULL) 229 errx(1, 230 "%s: unknown special file or file system.", 231 *argv); 232 if (BADTYPE(fs->fs_type)) 233 errx(1, "%s has unknown file system type.", 234 *argv); 235 mntfromname = fs->fs_spec; 236 mntonname = fs->fs_file; 237 fstypename = fs->fs_vfstype; 238 mountopts = fs->fs_mntops; 239 } 240 rval = mountfs(fstypename, mntfromname, 241 mntonname, init_flags, options, mountopts, 0); 242 break; 243 case 2: 244 /* 245 * If -t flag has not been specified, and spec contains either 246 * a ':' or a '@' then assume that an NFS filesystem is being 247 * specified ala Sun. 248 */ 249 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL) 250 vfstype = "nfs"; 251 rval = mountfs(vfstype, 252 argv[0], argv[1], init_flags, options, NULL, 0); 253 break; 254 default: 255 usage(); 256 /* NOTREACHED */ 257 } 258 259 /* 260 * If the mount was successfully, and done by root, tell mountd the 261 * good news. Pid checks are probably unnecessary, but don't hurt. 262 */ 263 if (rval == 0 && getuid() == 0 && 264 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 265 int pid; 266 267 if (fscanf(mountdfp, "%d", &pid) == 1 && 268 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 269 err(1, "signal mountd"); 270 (void)fclose(mountdfp); 271 } 272 273 exit(rval); 274 /* NOTREACHED */ 275 } 276 277 int 278 hasopt(mntopts, option) 279 const char *mntopts, *option; 280 { 281 int negative, found; 282 char *opt, *optbuf; 283 284 if (option[0] == 'n' && option[1] == 'o') { 285 negative = 1; 286 option += 2; 287 } else 288 negative = 0; 289 optbuf = strdup(mntopts); 290 found = 0; 291 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 292 if (opt[0] == 'n' && opt[1] == 'o') { 293 if (!strcasecmp(opt + 2, option)) 294 found = negative; 295 } else if (!strcasecmp(opt, option)) 296 found = !negative; 297 } 298 free(optbuf); 299 return (found); 300 } 301 302 int 303 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 304 const char *vfstype, *spec, *name, *options, *mntopts; 305 int flags, skipmounted; 306 { 307 /* List of directories containing mount_xxx subcommands. */ 308 static const char *edirs[] = { 309 _PATH_SBIN, 310 _PATH_USRSBIN, 311 NULL 312 }; 313 const char **argv, **edir; 314 struct statfs *sfp, sf; 315 pid_t pid; 316 int argc, numfs, i, status, maxargc; 317 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 318 mntpath[MAXPATHLEN]; 319 320 #ifdef __GNUC__ 321 (void) &name; 322 (void) &optbuf; 323 (void) &vfstype; 324 #endif 325 326 if (realpath(name, mntpath) == NULL) { 327 warn("realpath %s", name); 328 return (1); 329 } 330 331 name = mntpath; 332 333 optbuf = NULL; 334 if (mntopts) 335 catopt(&optbuf, mntopts); 336 if (options) 337 catopt(&optbuf, options); 338 if (!mntopts && !options) 339 catopt(&optbuf, "rw"); 340 341 if (!strcmp(name, "/")) 342 flags |= MNT_UPDATE; 343 else if (skipmounted) { 344 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 345 warn("getmntinfo"); 346 return (1); 347 } 348 for(i = 0; i < numfs; i++) { 349 /* XXX can't check f_mntfromname, 350 thanks to mfs, union, etc. */ 351 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 352 strncmp(vfstype, sfp[i].f_fstypename, 353 MFSNAMELEN) == 0) { 354 if (verbose) 355 (void)printf("%s on %s type %.*s: %s\n", 356 sfp[i].f_mntfromname, 357 sfp[i].f_mntonname, 358 MFSNAMELEN, 359 sfp[i].f_fstypename, 360 "already mounted"); 361 return (0); 362 } 363 } 364 } 365 if (flags & MNT_FORCE) 366 catopt(&optbuf, "force"); 367 if (flags & MNT_RDONLY) 368 catopt(&optbuf, "ro"); 369 370 if (flags & MNT_UPDATE) { 371 catopt(&optbuf, "update"); 372 /* Figure out the fstype only if we defaulted to ffs */ 373 if (vfstype == ffs_fstype && statfs(name, &sf) != -1) 374 vfstype = sf.f_fstypename; 375 } 376 377 maxargc = 64; 378 argv = malloc(sizeof(char *) * maxargc); 379 380 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 381 argc = 0; 382 argv[argc++] = execbase; 383 if (optbuf) 384 mangle(optbuf, &argc, &argv, &maxargc); 385 argv[argc++] = spec; 386 argv[argc++] = name; 387 argv[argc] = NULL; 388 389 if (verbose) { 390 (void)printf("exec:"); 391 for (i = 0; i < argc; i++) 392 (void)printf(" %s", argv[i]); 393 (void)printf("\n"); 394 } 395 396 switch (pid = vfork()) { 397 case -1: /* Error. */ 398 warn("vfork"); 399 if (optbuf) 400 free(optbuf); 401 return (1); 402 403 case 0: /* Child. */ 404 if (debug) 405 _exit(0); 406 407 /* Go find an executable. */ 408 edir = edirs; 409 do { 410 (void)snprintf(execname, 411 sizeof(execname), "%s/%s", *edir, execbase); 412 (void)execv(execname, (char * const *)argv); 413 if (errno != ENOENT) 414 warn("exec %s for %s", execname, name); 415 } while (*++edir != NULL); 416 417 if (errno == ENOENT) 418 warnx("%s not found for %s", execbase, name); 419 _exit(1); 420 /* NOTREACHED */ 421 422 default: /* Parent. */ 423 if (optbuf) 424 free(optbuf); 425 426 if (waitpid(pid, &status, 0) < 0) { 427 warn("waitpid"); 428 return (1); 429 } 430 431 if (WIFEXITED(status)) { 432 if (WEXITSTATUS(status) != 0) 433 return (WEXITSTATUS(status)); 434 } else if (WIFSIGNALED(status)) { 435 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 436 return (1); 437 } 438 439 if (verbose) { 440 if (statfs(name, &sf) < 0) { 441 warn("statfs %s", name); 442 return (1); 443 } 444 prmount(&sf); 445 } 446 break; 447 } 448 449 return (0); 450 } 451 452 void 453 prmount(sfp) 454 struct statfs *sfp; 455 { 456 int flags; 457 struct opt *o; 458 struct passwd *pw; 459 int f; 460 461 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, sfp->f_mntonname, 462 MFSNAMELEN, sfp->f_fstypename); 463 464 flags = sfp->f_flags & MNT_VISFLAGMASK; 465 for (f = 0, o = optnames; flags && o->o_opt; o++) 466 if (flags & o->o_opt) { 467 if (!o->o_silent) 468 (void)printf("%s%s", !f++ ? " (" : ", ", 469 o->o_name); 470 flags &= ~o->o_opt; 471 } 472 if (flags) 473 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 474 flags & (flags - 1) ? "s" : "", flags); 475 if (sfp->f_owner) { 476 (void)printf("%smounted by ", !f++ ? " (" : ", "); 477 if ((pw = getpwuid(sfp->f_owner)) != NULL) 478 (void)printf("%s", pw->pw_name); 479 else 480 (void)printf("%d", sfp->f_owner); 481 } 482 (void)printf(f ? ")\n" : "\n"); 483 } 484 485 struct statfs * 486 getmntpt(name) 487 const char *name; 488 { 489 struct statfs *mntbuf; 490 int i, mntsize; 491 492 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 493 for (i = 0; i < mntsize; i++) 494 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 495 strcmp(mntbuf[i].f_mntonname, name) == 0) 496 return (&mntbuf[i]); 497 return (NULL); 498 } 499 500 void 501 catopt(sp, o) 502 char **sp; 503 const char *o; 504 { 505 char *s; 506 size_t i, j; 507 508 s = *sp; 509 if (s) { 510 i = strlen(s); 511 j = i + 1 + strlen(o) + 1; 512 s = realloc(s, j); 513 (void)snprintf(s + i, j, ",%s", o); 514 } else 515 s = strdup(o); 516 *sp = s; 517 } 518 519 static void 520 mangle(options, argcp, argvp, maxargcp) 521 char *options; 522 int *argcp, *maxargcp; 523 const char ***argvp; 524 { 525 char *p, *s; 526 int argc, maxargc; 527 const char **argv; 528 529 argc = *argcp; 530 argv = *argvp; 531 maxargc = *maxargcp; 532 533 for (s = options; (p = strsep(&s, ",")) != NULL;) { 534 /* Always leave space for one more argument and the NULL. */ 535 if (argc >= maxargc - 4) { 536 maxargc <<= 1; 537 argv = realloc(argv, maxargc * sizeof(char *)); 538 } 539 if (*p != '\0') { 540 if (*p == '-') { 541 argv[argc++] = p; 542 p = strchr(p, '='); 543 if (p) { 544 *p = '\0'; 545 argv[argc++] = p+1; 546 } 547 } else if (strcmp(p, "rw") != 0) { 548 argv[argc++] = "-o"; 549 argv[argc++] = p; 550 } 551 } 552 } 553 554 *argcp = argc; 555 *argvp = argv; 556 *maxargcp = maxargc; 557 } 558 559 void 560 usage() 561 { 562 563 (void)fprintf(stderr, 564 "usage: mount %s %s\n mount %s\n mount %s\n", 565 "[-dfruvw] [-o options] [-t ffs | external_type]", 566 "special node", 567 "[-adfruvw] [-t ffs | external_type]", 568 "[-dfruvw] special | node"); 569 exit(1); 570 /* NOTREACHED */ 571 } 572
Indexes created Tue Sep 30 07:10:03 GMT 2025