mount.c revision 1.33
1 /* $NetBSD: mount.c,v 1.33 1997/10/29 18:55:58 christos 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 1.33 1997/10/29 18:55:58 christos 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 char *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 void mangle __P((char *, int *, const char **)); 76 int mountfs __P((const char *, const char *, const char *, 77 int, const char *, const char *, int)); 78 void prmount __P((struct statfs *)); 79 void usage __P((void)); 80 int main __P((int, char *[])); 81 82 /* Map from mount otions to printable formats. */ 83 static struct opt { 84 int o_opt; 85 int o_silent; 86 const char *o_name; 87 } optnames[] = { 88 { MNT_ASYNC, 0, "asynchronous" }, 89 { MNT_DEFEXPORTED, 1, "exported to the world" }, 90 { MNT_EXKERB, 1, "kerberos uid mapping" }, 91 { MNT_EXPORTED, 0, "NFS exported" }, 92 { MNT_EXPORTANON, 1, "anon uid mapping" }, 93 { MNT_EXRDONLY, 1, "exported read-only" }, 94 { MNT_LOCAL, 0, "local" }, 95 { MNT_NOATIME, 0, "noatime" }, 96 { MNT_NOCOREDUMP, 0, "nocoredump" }, 97 { MNT_NODEV, 0, "nodev" }, 98 { MNT_NOEXEC, 0, "noexec" }, 99 { MNT_NOSUID, 0, "nosuid" }, 100 { MNT_QUOTA, 0, "with quotas" }, 101 { MNT_RDONLY, 0, "read-only" }, 102 { MNT_ROOTFS, 1, "root file system" }, 103 { MNT_SYNCHRONOUS, 0, "synchronous" }, 104 { MNT_UNION, 0, "union" }, 105 { 0 } 106 }; 107 108 static char ffs[] = "ffs"; 109 110 int 111 main(argc, argv) 112 int argc; 113 char *argv[]; 114 { 115 const char *mntfromname, *mntonname, **vfslist, *vfstype; 116 struct fstab *fs; 117 struct statfs *mntbuf; 118 FILE *mountdfp; 119 int all, ch, forceall, i, init_flags, mntsize, rval; 120 char *options; 121 122 all = forceall = init_flags = 0; 123 options = NULL; 124 vfslist = NULL; 125 vfstype = ffs; 126 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 127 switch (ch) { 128 case 'A': 129 all = forceall = 1; 130 break; 131 case 'a': 132 all = 1; 133 break; 134 case 'd': 135 debug = 1; 136 break; 137 case 'f': 138 init_flags |= MNT_FORCE; 139 break; 140 case 'o': 141 if (*optarg) 142 options = catopt(options, optarg); 143 break; 144 case 'r': 145 init_flags |= MNT_RDONLY; 146 break; 147 case 't': 148 if (vfslist != NULL) 149 errx(1, "only one -t option may be specified."); 150 vfslist = makevfslist(optarg); 151 vfstype = optarg; 152 break; 153 case 'u': 154 init_flags |= MNT_UPDATE; 155 break; 156 case 'v': 157 verbose = 1; 158 break; 159 case 'w': 160 init_flags &= ~MNT_RDONLY; 161 break; 162 case '?': 163 default: 164 usage(); 165 /* NOTREACHED */ 166 } 167 argc -= optind; 168 argv += optind; 169 170 #define BADTYPE(type) \ 171 (strcmp(type, FSTAB_RO) && \ 172 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 173 174 rval = 0; 175 switch (argc) { 176 case 0: 177 if (all) 178 while ((fs = getfsent()) != NULL) { 179 if (BADTYPE(fs->fs_type)) 180 continue; 181 if (checkvfsname(fs->fs_vfstype, vfslist)) 182 continue; 183 if (hasopt(fs->fs_mntops, "noauto")) 184 continue; 185 if (mountfs(fs->fs_vfstype, fs->fs_spec, 186 fs->fs_file, init_flags, options, 187 fs->fs_mntops, !forceall)) 188 rval = 1; 189 } 190 else { 191 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 192 err(1, "getmntinfo"); 193 for (i = 0; i < mntsize; i++) { 194 if (checkvfsname(mntbuf[i].f_fstypename, 195 vfslist)) 196 continue; 197 prmount(&mntbuf[i]); 198 } 199 } 200 exit(rval); 201 case 1: 202 if (vfslist != NULL) 203 usage(); 204 205 if (init_flags & MNT_UPDATE) { 206 if ((mntbuf = getmntpt(*argv)) == NULL) 207 errx(1, 208 "unknown special file or file system %s.", 209 *argv); 210 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) 211 mntfromname = fs->fs_spec; 212 else 213 mntfromname = mntbuf->f_mntfromname; 214 /* If it's an update, ignore the fstab file options. */ 215 fs->fs_mntops = NULL; 216 mntonname = mntbuf->f_mntonname; 217 } else { 218 if ((fs = getfsfile(*argv)) == NULL && 219 (fs = getfsspec(*argv)) == NULL) 220 errx(1, 221 "%s: unknown special file or file system.", 222 *argv); 223 if (BADTYPE(fs->fs_type)) 224 errx(1, "%s has unknown file system type.", 225 *argv); 226 mntfromname = fs->fs_spec; 227 mntonname = fs->fs_file; 228 } 229 rval = mountfs(fs->fs_vfstype, mntfromname, 230 mntonname, init_flags, options, fs->fs_mntops, 0); 231 break; 232 case 2: 233 /* 234 * If -t flag has not been specified, and spec contains either 235 * a ':' or a '@' then assume that an NFS filesystem is being 236 * specified ala Sun. 237 */ 238 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL) 239 vfstype = "nfs"; 240 rval = mountfs(vfstype, 241 argv[0], argv[1], init_flags, options, NULL, 0); 242 break; 243 default: 244 usage(); 245 /* NOTREACHED */ 246 } 247 248 /* 249 * If the mount was successfully, and done by root, tell mountd the 250 * good news. Pid checks are probably unnecessary, but don't hurt. 251 */ 252 if (rval == 0 && getuid() == 0 && 253 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 254 int pid; 255 256 if (fscanf(mountdfp, "%d", &pid) == 1 && 257 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 258 err(1, "signal mountd"); 259 (void)fclose(mountdfp); 260 } 261 262 exit(rval); 263 } 264 265 int 266 hasopt(mntopts, option) 267 const char *mntopts, *option; 268 { 269 int negative, found; 270 char *opt, *optbuf; 271 272 if (option[0] == 'n' && option[1] == 'o') { 273 negative = 1; 274 option += 2; 275 } else 276 negative = 0; 277 optbuf = strdup(mntopts); 278 found = 0; 279 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 280 if (opt[0] == 'n' && opt[1] == 'o') { 281 if (!strcasecmp(opt + 2, option)) 282 found = negative; 283 } else if (!strcasecmp(opt, option)) 284 found = !negative; 285 } 286 free(optbuf); 287 return (found); 288 } 289 290 int 291 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted) 292 const char *vfstype, *spec, *name, *options, *mntopts; 293 int flags, skipmounted; 294 { 295 /* List of directories containing mount_xxx subcommands. */ 296 static const char *edirs[] = { 297 _PATH_SBIN, 298 _PATH_USRSBIN, 299 NULL 300 }; 301 const char *argv[100], **edir; 302 struct statfs sf; 303 pid_t pid; 304 int argc, i, status; 305 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 306 mntpath[MAXPATHLEN]; 307 #ifdef __GNUC__ 308 (void) &name; 309 (void) &optbuf; 310 (void) &vfstype; 311 #endif 312 313 if (realpath(name, mntpath) == NULL) { 314 warn("realpath %s", name); 315 return (1); 316 } 317 318 name = mntpath; 319 320 if (mntopts == NULL) 321 mntopts = ""; 322 if (options == NULL) { 323 if (*mntopts == '\0') { 324 options = "rw"; 325 } else { 326 options = mntopts; 327 mntopts = ""; 328 } 329 } 330 optbuf = catopt(strdup(mntopts), options); 331 332 if (strcmp(name, "/") == 0) 333 flags |= MNT_UPDATE; 334 else if (skipmounted) { 335 if (statfs(name, &sf) < 0) { 336 warn("statfs %s", name); 337 return (1); 338 } 339 /* XXX can't check f_mntfromname, thanks to mfs, union, etc. */ 340 if (strncmp(name, sf.f_mntonname, MNAMELEN) == 0 && 341 strncmp(vfstype, sf.f_fstypename, MFSNAMELEN) == 0) { 342 if (verbose) 343 (void)printf("%s on %s type %.*s: %s\n", 344 sf.f_mntfromname, sf.f_mntonname, 345 MFSNAMELEN, sf.f_fstypename, 346 "already mounted"); 347 return (0); 348 } 349 } 350 if (flags & MNT_FORCE) 351 optbuf = catopt(optbuf, "force"); 352 if (flags & MNT_RDONLY) 353 optbuf = catopt(optbuf, "ro"); 354 355 if (flags & MNT_UPDATE) { 356 optbuf = catopt(optbuf, "update"); 357 /* Figure out the fstype only if we defaulted to ffs */ 358 if (vfstype == ffs && statfs(name, &sf) != -1) 359 vfstype = sf.f_fstypename; 360 } 361 362 (void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 363 argc = 0; 364 argv[argc++] = execbase; 365 mangle(optbuf, &argc, argv); 366 argv[argc++] = spec; 367 argv[argc++] = name; 368 argv[argc] = NULL; 369 370 if (debug) { 371 (void)printf("exec: %s", execbase); 372 for (i = 1; i < argc; i++) 373 (void)printf(" %s", argv[i]); 374 (void)printf("\n"); 375 return (0); 376 } 377 378 switch (pid = vfork()) { 379 case -1: /* Error. */ 380 warn("vfork"); 381 free(optbuf); 382 return (1); 383 case 0: /* Child. */ 384 /* Go find an executable. */ 385 edir = edirs; 386 do { 387 (void)snprintf(execname, 388 sizeof(execname), "%s/%s", *edir, execbase); 389 execv(execname, (char * const *)argv); 390 if (errno != ENOENT) 391 warn("exec %s for %s", execname, name); 392 } while (*++edir != NULL); 393 394 if (errno == ENOENT) 395 warnx("%s not found for %s", execbase, name); 396 exit(1); 397 /* NOTREACHED */ 398 default: /* Parent. */ 399 free(optbuf); 400 401 if (waitpid(pid, &status, 0) < 0) { 402 warn("waitpid"); 403 return (1); 404 } 405 406 if (WIFEXITED(status)) { 407 if (WEXITSTATUS(status) != 0) 408 return (WEXITSTATUS(status)); 409 } else if (WIFSIGNALED(status)) { 410 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 411 return (1); 412 } 413 414 if (verbose) { 415 if (statfs(name, &sf) < 0) { 416 warn("statfs %s", name); 417 return (1); 418 } 419 prmount(&sf); 420 } 421 break; 422 } 423 424 return (0); 425 } 426 427 void 428 prmount(sfp) 429 struct statfs *sfp; 430 { 431 int flags; 432 struct opt *o; 433 struct passwd *pw; 434 int f; 435 436 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, sfp->f_mntonname, 437 MFSNAMELEN, sfp->f_fstypename); 438 439 flags = sfp->f_flags & MNT_VISFLAGMASK; 440 for (f = 0, o = optnames; flags && o->o_opt; o++) 441 if (flags & o->o_opt) { 442 if (!o->o_silent) 443 (void)printf("%s%s", !f++ ? " (" : ", ", 444 o->o_name); 445 flags &= ~o->o_opt; 446 } 447 if (flags) 448 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 449 flags & (flags - 1) ? "s" : "", flags); 450 if (sfp->f_owner) { 451 (void)printf("%smounted by ", !f++ ? " (" : ", "); 452 if ((pw = getpwuid(sfp->f_owner)) != NULL) 453 (void)printf("%s", pw->pw_name); 454 else 455 (void)printf("%d", sfp->f_owner); 456 } 457 (void)printf(f ? ")\n" : "\n"); 458 } 459 460 struct statfs * 461 getmntpt(name) 462 const char *name; 463 { 464 struct statfs *mntbuf; 465 int i, mntsize; 466 467 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 468 for (i = 0; i < mntsize; i++) 469 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 470 strcmp(mntbuf[i].f_mntonname, name) == 0) 471 return (&mntbuf[i]); 472 return (NULL); 473 } 474 475 char * 476 catopt(s0, s1) 477 char *s0; 478 const char *s1; 479 { 480 size_t i; 481 char *cp; 482 483 if (s0 && *s0) { 484 i = strlen(s0) + strlen(s1) + 1 + 1; 485 if ((cp = malloc(i)) == NULL) 486 err(1, "%s", ""); 487 (void)snprintf(cp, i, "%s,%s", s0, s1); 488 } else 489 cp = strdup(s1); 490 491 if (s0) 492 free(s0); 493 return (cp); 494 } 495 496 void 497 mangle(options, argcp, argv) 498 char *options; 499 int *argcp; 500 const char **argv; 501 { 502 char *p, *s; 503 int argc; 504 505 argc = *argcp; 506 for (s = options; (p = strsep(&s, ",")) != NULL;) 507 if (*p != '\0') 508 if (*p == '-') { 509 argv[argc++] = p; 510 p = strchr(p, '='); 511 if (p) { 512 *p = '\0'; 513 argv[argc++] = p+1; 514 } 515 } else if (strcmp(p, "rw") != 0) { 516 argv[argc++] = "-o"; 517 argv[argc++] = p; 518 } 519 520 *argcp = argc; 521 } 522 523 void 524 usage() 525 { 526 527 (void)fprintf(stderr, 528 "usage: mount %s %s\n mount %s\n mount %s\n", 529 "[-dfruvw] [-o options] [-t ffs | external_type]", 530 "special node", 531 "[-adfruvw] [-t ffs | external_type]", 532 "[-dfruvw] special | node"); 533 exit(1); 534 } 535
Indexes created Tue Sep 30 11:09:46 GMT 2025