mount.c revision 1.39
1 /* $NetBSD: mount.c,v 1.39 1997/11/01 18:38:29 drochner 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 1.39 1997/11/01 18:38:29 drochner 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_NOEXEC, 0, "noexec" }, 100 { MNT_NOSUID, 0, "nosuid" }, 101 { MNT_QUOTA, 0, "with quotas" }, 102 { MNT_RDONLY, 0, "read-only" }, 103 { MNT_ROOTFS, 1, "root file system" }, 104 { MNT_SYNCHRONOUS, 0, "synchronous" }, 105 { MNT_UNION, 0, "union" }, 106 { 0 } 107 }; 108 109 static char ffs[] = "ffs"; 110 111 int 112 main(argc, argv) 113 int argc; 114 char *argv[]; 115 { 116 const char *mntfromname, *mntonname, **vfslist, *vfstype; 117 struct fstab *fs; 118 struct statfs *mntbuf; 119 FILE *mountdfp; 120 int all, ch, forceall, i, init_flags, mntsize, rval; 121 char *options; 122 123 all = forceall = init_flags = 0; 124 options = NULL; 125 vfslist = NULL; 126 vfstype = ffs; 127 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 128 switch (ch) { 129 case 'A': 130 all = forceall = 1; 131 break; 132 case 'a': 133 all = 1; 134 break; 135 case 'd': 136 debug = 1; 137 break; 138 case 'f': 139 init_flags |= MNT_FORCE; 140 break; 141 case 'o': 142 if (*optarg) 143 catopt(&options, optarg); 144 break; 145 case 'r': 146 init_flags |= MNT_RDONLY; 147 break; 148 case 't': 149 if (vfslist != NULL) 150 errx(1, "only one -t option may be specified."); 151 vfslist = makevfslist(optarg); 152 vfstype = optarg; 153 break; 154 case 'u': 155 init_flags |= MNT_UPDATE; 156 break; 157 case 'v': 158 verbose = 1; 159 break; 160 case 'w': 161 init_flags &= ~MNT_RDONLY; 162 break; 163 case '?': 164 default: 165 usage(); 166 /* NOTREACHED */ 167 } 168 argc -= optind; 169 argv += optind; 170 171 #define BADTYPE(type) \ 172 (strcmp(type, FSTAB_RO) && \ 173 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 174 175 rval = 0; 176 switch (argc) { 177 case 0: 178 if (all) 179 while ((fs = getfsent()) != NULL) { 180 if (BADTYPE(fs->fs_type)) 181 continue; 182 if (checkvfsname(fs->fs_vfstype, vfslist)) 183 continue; 184 if (hasopt(fs->fs_mntops, "noauto")) 185 continue; 186 if (mountfs(fs->fs_vfstype, fs->fs_spec, 187 fs->fs_file, init_flags, options, 188 fs->fs_mntops, !forceall)) 189 rval = 1; 190 } 191 else { 192 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 193 err(1, "getmntinfo"); 194 for (i = 0; i < mntsize; i++) { 195 if (checkvfsname(mntbuf[i].f_fstypename, 196 vfslist)) 197 continue; 198 prmount(&mntbuf[i]); 199 } 200 } 201 exit(rval); 202 case 1: 203 if (vfslist != NULL) 204 usage(); 205 206 if (init_flags & MNT_UPDATE) { 207 if ((mntbuf = getmntpt(*argv)) == NULL) 208 errx(1, 209 "unknown special file or file system %s.", 210 *argv); 211 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) 212 mntfromname = fs->fs_spec; 213 else 214 mntfromname = mntbuf->f_mntfromname; 215 /* If it's an update, ignore the fstab file options. */ 216 fs->fs_mntops = NULL; 217 mntonname = mntbuf->f_mntonname; 218 } else { 219 if ((fs = getfsfile(*argv)) == NULL && 220 (fs = getfsspec(*argv)) == NULL) 221 errx(1, 222 "%s: unknown special file or file system.", 223 *argv); 224 if (BADTYPE(fs->fs_type)) 225 errx(1, "%s has unknown file system type.", 226 *argv); 227 mntfromname = fs->fs_spec; 228 mntonname = fs->fs_file; 229 } 230 rval = mountfs(fs->fs_vfstype, mntfromname, 231 mntonname, init_flags, options, fs->fs_mntops, 0); 232 break; 233 case 2: 234 /* 235 * If -t flag has not been specified, and spec contains either 236 * a ':' or a '@' then assume that an NFS filesystem is being 237 * specified ala Sun. 238 */ 239 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL) 240 vfstype = "nfs"; 241 rval = mountfs(vfstype, 242 argv[0], argv[1], init_flags, options, NULL, 0); 243 break; 244 default: 245 usage(); 246 /* NOTREACHED */ 247 } 248 249 /* 250 * If the mount was successfully, and done by root, tell mountd the 251 * good news. Pid checks are probably unnecessary, but don't hurt. 252 */ 253 if (rval == 0 && getuid() == 0 && 254 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 255 int pid; 256 257 if (fscanf(mountdfp, "%d", &pid) == 1 && 258 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 259 err(1, "signal mountd"); 260 (void)fclose(mountdfp); 261 } 262 263 exit(rval); 264 } 265 266 int 267 hasopt(mntopts, option) 268 const char *mntopts, *option; 269 { 270 int negative, found; 271 char *opt, *optbuf; 272 273 if (option[0] == 'n' && option[1] == 'o') { 274 negative = 1; 275 option += 2; 276 } else 277 negative = 0; 278 optbuf = strdup(mntopts); 279 found = 0; 280 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 281 if (opt[0] == 'n' && opt[1] == 'o') { 282 if (!strcasecmp(opt + 2, option)) 283 found = negative; 284 } else if (!strcasecmp(opt, option)) 285 found = !negative; 286 } 287 free(optbuf); 288 return (found); 289 } 290 291 int 292 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 293 const char *vfstype, *spec, *name, *options, *mntopts; 294 int flags, skipmounted; 295 { 296 /* List of directories containing mount_xxx subcommands. */ 297 static const char *edirs[] = { 298 _PATH_SBIN, 299 _PATH_USRSBIN, 300 NULL 301 }; 302 const char **argv, **edir; 303 struct statfs *sfp, sf; 304 pid_t pid; 305 int argc, numfs, i, status, maxargc; 306 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 307 mntpath[MAXPATHLEN]; 308 309 #ifdef __GNUC__ 310 (void) &name; 311 (void) &optbuf; 312 (void) &vfstype; 313 #endif 314 315 if (realpath(name, mntpath) == NULL) { 316 warn("realpath %s", name); 317 return (1); 318 } 319 320 name = mntpath; 321 322 optbuf = NULL; 323 if (mntopts) 324 catopt(&optbuf, mntopts); 325 if (options) 326 catopt(&optbuf, options); 327 if (!mntopts && !options) 328 catopt(&optbuf, "rw"); 329 330 if (!strcmp(name, "/")) 331 flags |= MNT_UPDATE; 332 else if (skipmounted) { 333 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 334 warn("getmntinfo"); 335 return (1); 336 } 337 for(i = 0; i < numfs; i++) { 338 /* XXX can't check f_mntfromname, 339 thanks to mfs, union, etc. */ 340 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 341 strncmp(vfstype, sfp[i].f_fstypename, 342 MFSNAMELEN) == 0) { 343 if (verbose) 344 (void)printf("%s on %s type %.*s: %s\n", 345 sfp[i].f_mntfromname, 346 sfp[i].f_mntonname, 347 MFSNAMELEN, 348 sfp[i].f_fstypename, 349 "already mounted"); 350 return (0); 351 } 352 } 353 } 354 if (flags & MNT_FORCE) 355 catopt(&optbuf, "force"); 356 if (flags & MNT_RDONLY) 357 catopt(&optbuf, "ro"); 358 359 if (flags & MNT_UPDATE) { 360 catopt(&optbuf, "update"); 361 /* Figure out the fstype only if we defaulted to ffs */ 362 if (vfstype == ffs && statfs(name, &sf) != -1) 363 vfstype = sf.f_fstypename; 364 } 365 366 maxargc = 64; 367 argv = malloc(sizeof(char *) * maxargc); 368 369 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 370 argc = 0; 371 argv[argc++] = execbase; 372 if (optbuf) 373 mangle(optbuf, &argc, &argv, &maxargc); 374 argv[argc++] = spec; 375 argv[argc++] = name; 376 argv[argc] = NULL; 377 378 if (verbose) { 379 (void)printf("exec:"); 380 for (i = 0; i < argc; i++) 381 (void)printf(" %s", argv[i]); 382 (void)printf("\n"); 383 } 384 385 switch (pid = vfork()) { 386 case -1: /* Error. */ 387 warn("vfork"); 388 if (optbuf) 389 free(optbuf); 390 return (1); 391 392 case 0: /* Child. */ 393 if (debug) 394 _exit(0); 395 396 /* Go find an executable. */ 397 edir = edirs; 398 do { 399 (void)snprintf(execname, 400 sizeof(execname), "%s/%s", *edir, execbase); 401 execv(execname, (char * const *)argv); 402 if (errno != ENOENT) 403 warn("exec %s for %s", execname, name); 404 } while (*++edir != NULL); 405 406 if (errno == ENOENT) 407 warnx("%s not found for %s", execbase, name); 408 _exit(1); 409 /* NOTREACHED */ 410 411 default: /* Parent. */ 412 if (optbuf) 413 free(optbuf); 414 415 if (waitpid(pid, &status, 0) < 0) { 416 warn("waitpid"); 417 return (1); 418 } 419 420 if (WIFEXITED(status)) { 421 if (WEXITSTATUS(status) != 0) 422 return (WEXITSTATUS(status)); 423 } else if (WIFSIGNALED(status)) { 424 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 425 return (1); 426 } 427 428 if (verbose) { 429 if (statfs(name, &sf) < 0) { 430 warn("statfs %s", name); 431 return (1); 432 } 433 prmount(&sf); 434 } 435 break; 436 } 437 438 return (0); 439 } 440 441 void 442 prmount(sfp) 443 struct statfs *sfp; 444 { 445 int flags; 446 struct opt *o; 447 struct passwd *pw; 448 int f; 449 450 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, sfp->f_mntonname, 451 MFSNAMELEN, sfp->f_fstypename); 452 453 flags = sfp->f_flags & MNT_VISFLAGMASK; 454 for (f = 0, o = optnames; flags && o->o_opt; o++) 455 if (flags & o->o_opt) { 456 if (!o->o_silent) 457 (void)printf("%s%s", !f++ ? " (" : ", ", 458 o->o_name); 459 flags &= ~o->o_opt; 460 } 461 if (flags) 462 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 463 flags & (flags - 1) ? "s" : "", flags); 464 if (sfp->f_owner) { 465 (void)printf("%smounted by ", !f++ ? " (" : ", "); 466 if ((pw = getpwuid(sfp->f_owner)) != NULL) 467 (void)printf("%s", pw->pw_name); 468 else 469 (void)printf("%d", sfp->f_owner); 470 } 471 (void)printf(f ? ")\n" : "\n"); 472 } 473 474 struct statfs * 475 getmntpt(name) 476 const char *name; 477 { 478 struct statfs *mntbuf; 479 int i, mntsize; 480 481 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 482 for (i = 0; i < mntsize; i++) 483 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 484 strcmp(mntbuf[i].f_mntonname, name) == 0) 485 return (&mntbuf[i]); 486 return (NULL); 487 } 488 489 void 490 catopt(sp, o) 491 char **sp; 492 const char *o; 493 { 494 char *s; 495 size_t i, j; 496 497 s = *sp; 498 if (s) { 499 i = strlen(s); 500 j = i + 1 + strlen(o) + 1; 501 s = realloc(s, j); 502 (void)snprintf(s + i, j, ",%s", o); 503 } else 504 s = strdup(o); 505 *sp = s; 506 } 507 508 static void 509 mangle(options, argcp, argvp, maxargcp) 510 char *options; 511 int *argcp, *maxargcp; 512 const char ***argvp; 513 { 514 char *p, *s; 515 int argc, maxargc; 516 const char **argv; 517 518 argc = *argcp; 519 argv = *argvp; 520 maxargc = *maxargcp; 521 522 for (s = options; (p = strsep(&s, ",")) != NULL;) { 523 /* Always leave space for one more argument and the NULL. */ 524 if (argc >= maxargc - 4) { 525 maxargc <<= 1; 526 argv = realloc(argv, maxargc * sizeof(char *)); 527 } 528 if (*p != '\0') 529 if (*p == '-') { 530 argv[argc++] = p; 531 p = strchr(p, '='); 532 if (p) { 533 *p = '\0'; 534 argv[argc++] = p+1; 535 } 536 } else if (strcmp(p, "rw") != 0) { 537 argv[argc++] = "-o"; 538 argv[argc++] = p; 539 } 540 } 541 542 *argcp = argc; 543 *argvp = argv; 544 *maxargcp = maxargc; 545 } 546 547 void 548 usage() 549 { 550 551 (void)fprintf(stderr, 552 "usage: mount %s %s\n mount %s\n mount %s\n", 553 "[-dfruvw] [-o options] [-t ffs | external_type]", 554 "special node", 555 "[-adfruvw] [-t ffs | external_type]", 556 "[-dfruvw] special | node"); 557 exit(1); 558 } 559
Indexes created Sun Oct 19 02:09:48 GMT 2025