mount.c revision 1.32
1 /* $NetBSD: mount.c,v 1.32 1997/09/16 12:22:45 lukem 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 1.32 1997/09/16 12:22:45 lukem 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], mntpath[MAXPATHLEN]; 306 #ifdef __GNUC__ 307 (void) &name; 308 (void) &optbuf; 309 (void) &vfstype; 310 #endif 311 312 if (realpath(name, mntpath) == NULL) { 313 warn("realpath %s", name); 314 return (1); 315 } 316 317 name = mntpath; 318 319 if (mntopts == NULL) 320 mntopts = ""; 321 if (options == NULL) { 322 if (*mntopts == '\0') { 323 options = "rw"; 324 } else { 325 options = mntopts; 326 mntopts = ""; 327 } 328 } 329 optbuf = catopt(strdup(mntopts), options); 330 331 if (strcmp(name, "/") == 0) 332 flags |= MNT_UPDATE; 333 else if (skipmounted) { 334 if (statfs(name, &sf) < 0) { 335 warn("statfs %s", name); 336 return (1); 337 } 338 /* XXX can't check f_mntfromname, thanks to mfs, union, etc. */ 339 if (strncmp(name, sf.f_mntonname, MNAMELEN) == 0 && 340 strncmp(vfstype, sf.f_fstypename, MFSNAMELEN) == 0) { 341 if (verbose) 342 (void)printf("%s on %s type %.*s: %s\n", 343 sf.f_mntfromname, sf.f_mntonname, 344 MFSNAMELEN, sf.f_fstypename, 345 "already mounted"); 346 return (0); 347 } 348 } 349 if (flags & MNT_FORCE) 350 optbuf = catopt(optbuf, "force"); 351 if (flags & MNT_RDONLY) 352 optbuf = catopt(optbuf, "ro"); 353 /* 354 * XXX 355 * The mount_mfs (newfs) command uses -o to select the 356 * optimisation mode. We don't pass the default "-o rw" 357 * for that reason. 358 */ 359 if (flags & MNT_UPDATE) { 360 optbuf = 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 argc = 0; 367 argv[argc++] = vfstype; 368 mangle(optbuf, &argc, argv); 369 argv[argc++] = spec; 370 argv[argc++] = name; 371 argv[argc] = NULL; 372 373 if (debug) { 374 (void)printf("exec: mount_%s", vfstype); 375 for (i = 1; i < argc; i++) 376 (void)printf(" %s", argv[i]); 377 (void)printf("\n"); 378 return (0); 379 } 380 381 switch (pid = vfork()) { 382 case -1: /* Error. */ 383 warn("vfork"); 384 free(optbuf); 385 return (1); 386 case 0: /* Child. */ 387 /* Go find an executable. */ 388 edir = edirs; 389 do { 390 (void)snprintf(execname, 391 sizeof(execname), "%s/mount_%s", *edir, vfstype); 392 execv(execname, (char * const *)argv); 393 if (errno != ENOENT) 394 warn("exec %s for %s", execname, name); 395 } while (*++edir != NULL); 396 397 if (errno == ENOENT) 398 warnx("mount_%s not found for %s", vfstype, name); 399 exit(1); 400 /* NOTREACHED */ 401 default: /* Parent. */ 402 free(optbuf); 403 404 if (waitpid(pid, &status, 0) < 0) { 405 warn("waitpid"); 406 return (1); 407 } 408 409 if (WIFEXITED(status)) { 410 if (WEXITSTATUS(status) != 0) 411 return (WEXITSTATUS(status)); 412 } else if (WIFSIGNALED(status)) { 413 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 414 return (1); 415 } 416 417 if (verbose) { 418 if (statfs(name, &sf) < 0) { 419 warn("statfs %s", name); 420 return (1); 421 } 422 prmount(&sf); 423 } 424 break; 425 } 426 427 return (0); 428 } 429 430 void 431 prmount(sfp) 432 struct statfs *sfp; 433 { 434 int flags; 435 struct opt *o; 436 struct passwd *pw; 437 int f; 438 439 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, sfp->f_mntonname, 440 MFSNAMELEN, sfp->f_fstypename); 441 442 flags = sfp->f_flags & MNT_VISFLAGMASK; 443 for (f = 0, o = optnames; flags && o->o_opt; o++) 444 if (flags & o->o_opt) { 445 if (!o->o_silent) 446 (void)printf("%s%s", !f++ ? " (" : ", ", 447 o->o_name); 448 flags &= ~o->o_opt; 449 } 450 if (flags) 451 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 452 flags & (flags - 1) ? "s" : "", flags); 453 if (sfp->f_owner) { 454 (void)printf("%smounted by ", !f++ ? " (" : ", "); 455 if ((pw = getpwuid(sfp->f_owner)) != NULL) 456 (void)printf("%s", pw->pw_name); 457 else 458 (void)printf("%d", sfp->f_owner); 459 } 460 (void)printf(f ? ")\n" : "\n"); 461 } 462 463 struct statfs * 464 getmntpt(name) 465 const char *name; 466 { 467 struct statfs *mntbuf; 468 int i, mntsize; 469 470 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 471 for (i = 0; i < mntsize; i++) 472 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 473 strcmp(mntbuf[i].f_mntonname, name) == 0) 474 return (&mntbuf[i]); 475 return (NULL); 476 } 477 478 char * 479 catopt(s0, s1) 480 char *s0; 481 const char *s1; 482 { 483 size_t i; 484 char *cp; 485 486 if (s0 && *s0) { 487 i = strlen(s0) + strlen(s1) + 1 + 1; 488 if ((cp = malloc(i)) == NULL) 489 err(1, "%s", ""); 490 (void)snprintf(cp, i, "%s,%s", s0, s1); 491 } else 492 cp = strdup(s1); 493 494 if (s0) 495 free(s0); 496 return (cp); 497 } 498 499 void 500 mangle(options, argcp, argv) 501 char *options; 502 int *argcp; 503 const char **argv; 504 { 505 char *p, *s; 506 int argc; 507 508 argc = *argcp; 509 for (s = options; (p = strsep(&s, ",")) != NULL;) 510 if (*p != '\0') 511 if (*p == '-') { 512 argv[argc++] = p; 513 p = strchr(p, '='); 514 if (p) { 515 *p = '\0'; 516 argv[argc++] = p+1; 517 } 518 } else if (strcmp(p, "rw") != 0) { 519 argv[argc++] = "-o"; 520 argv[argc++] = p; 521 } 522 523 *argcp = argc; 524 } 525 526 void 527 usage() 528 { 529 530 (void)fprintf(stderr, 531 "usage: mount %s %s\n mount %s\n mount %s\n", 532 "[-dfruvw] [-o options] [-t ffs | external_type]", 533 "special node", 534 "[-adfruvw] [-t ffs | external_type]", 535 "[-dfruvw] special | node"); 536 exit(1); 537 } 538
Indexes created Mon Sep 29 21:09:56 GMT 2025