mount.c revision 44811
1/*- 2 * Copyright (c) 1980, 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1980, 1989, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95"; 43#endif 44static const char rcsid[] = 45 "$Id: mount.c,v 1.28 1998/07/06 07:12:38 charnier Exp $"; 46#endif /* not lint */ 47 48#include <sys/param.h> 49#include <sys/mount.h> 50#include <sys/stat.h> 51#include <sys/wait.h> 52 53#include <err.h> 54#include <errno.h> 55#include <fstab.h> 56#include <pwd.h> 57#include <signal.h> 58#include <stdio.h> 59#include <stdlib.h> 60#include <string.h> 61#include <unistd.h> 62 63#include "extern.h" 64#include "pathnames.h" 65 66int debug, fstab_style, verbose; 67 68char *catopt __P((char *, const char *)); 69struct statfs 70 *getmntpt __P((const char *)); 71int hasopt __P((const char *, const char *)); 72int ismounted __P((struct fstab *, struct statfs *, int)); 73int isremountable __P((const char *)); 74void mangle __P((char *, int *, const char **)); 75int mountfs __P((const char *, const char *, const char *, 76 int, const char *, const char *)); 77void prmount __P((struct statfs *)); 78void putfsent __P((const struct statfs *)); 79void usage __P((void)); 80 81/* Map from mount options to printable formats. */ 82static struct opt { 83 int o_opt; 84 const char *o_name; 85} optnames[] = { 86 { MNT_ASYNC, "asynchronous" }, 87 { MNT_EXPORTED, "NFS exported" }, 88 { MNT_LOCAL, "local" }, 89 { MNT_NOATIME, "noatime" }, 90 { MNT_NODEV, "nodev" }, 91 { MNT_NOEXEC, "noexec" }, 92 { MNT_NOSUID, "nosuid" }, 93 { MNT_NOSYMFOLLOW, "nosymfollow" }, 94 { MNT_QUOTA, "with quotas" }, 95 { MNT_RDONLY, "read-only" }, 96 { MNT_SYNCHRONOUS, "synchronous" }, 97 { MNT_UNION, "union" }, 98 { MNT_NOCLUSTERR, "noclusterr" }, 99 { MNT_NOCLUSTERW, "noclusterw" }, 100 { MNT_SUIDDIR, "suiddir" }, 101 { MNT_SOFTDEP, "soft-updates" }, 102 { NULL } 103}; 104 105/* 106 * List of VFS types that can be remounted without becoming mounted on top 107 * of each other. 108 * XXX Is this list correct? 109 */ 110static const char * 111remountable_fs_names[] = { 112 "ufs", "ffs", "lfs", "ext2fs", 113 0 114}; 115 116int 117main(argc, argv) 118 int argc; 119 char * const argv[]; 120{ 121 const char *mntfromname, **vfslist, *vfstype; 122 struct fstab *fs; 123 struct statfs *mntbuf; 124 FILE *mountdfp; 125 pid_t pid; 126 int all, ch, i, init_flags, mntsize, rval; 127 char *options; 128 129 all = init_flags = 0; 130 options = NULL; 131 vfslist = NULL; 132 vfstype = "ufs"; 133 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1) 134 switch (ch) { 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 options = catopt(options, optarg); 147 break; 148 case 'p': 149 fstab_style = 1; 150 verbose = 1; 151 break; 152 case 'r': 153 init_flags |= MNT_RDONLY; 154 break; 155 case 't': 156 if (vfslist != NULL) 157 errx(1, "only one -t option may be specified"); 158 vfslist = makevfslist(optarg); 159 vfstype = optarg; 160 break; 161 case 'u': 162 init_flags |= MNT_UPDATE; 163 break; 164 case 'v': 165 verbose = 1; 166 break; 167 case 'w': 168 init_flags &= ~MNT_RDONLY; 169 break; 170 case '?': 171 default: 172 usage(); 173 /* NOTREACHED */ 174 } 175 argc -= optind; 176 argv += optind; 177 178#define BADTYPE(type) \ 179 (strcmp(type, FSTAB_RO) && \ 180 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 181 182 rval = 0; 183 switch (argc) { 184 case 0: 185 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 186 err(1, "getmntinfo"); 187 if (all) { 188 while ((fs = getfsent()) != NULL) { 189 if (BADTYPE(fs->fs_type)) 190 continue; 191 if (checkvfsname(fs->fs_vfstype, vfslist)) 192 continue; 193 if (hasopt(fs->fs_mntops, "noauto")) 194 continue; 195 if (!(init_flags & MNT_UPDATE) && 196 ismounted(fs, mntbuf, mntsize)) 197 continue; 198 if (mountfs(fs->fs_vfstype, fs->fs_spec, 199 fs->fs_file, init_flags, options, 200 fs->fs_mntops)) 201 rval = 1; 202 } 203 } else if (fstab_style) { 204 for (i = 0; i < mntsize; i++) { 205 if (checkvfsname(mntbuf[i].f_fstypename, vfslist)) 206 continue; 207 putfsent(&mntbuf[i]); 208 } 209 } else { 210 for (i = 0; i < mntsize; i++) { 211 if (checkvfsname(mntbuf[i].f_fstypename, 212 vfslist)) 213 continue; 214 prmount(&mntbuf[i]); 215 } 216 } 217 exit(rval); 218 case 1: 219 if (vfslist != NULL) 220 usage(); 221 222 if (init_flags & MNT_UPDATE) { 223 if ((mntbuf = getmntpt(*argv)) == NULL) 224 errx(1, 225 "unknown special file or file system %s", 226 *argv); 227 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) 228 mntfromname = fs->fs_spec; 229 else 230 mntfromname = mntbuf->f_mntfromname; 231 rval = mountfs(mntbuf->f_fstypename, mntfromname, 232 mntbuf->f_mntonname, init_flags, options, 0); 233 break; 234 } 235 if ((fs = getfsfile(*argv)) == NULL && 236 (fs = getfsspec(*argv)) == NULL) 237 errx(1, "%s: unknown special file or file system", 238 *argv); 239 if (BADTYPE(fs->fs_type)) 240 errx(1, "%s has unknown file system type", 241 *argv); 242 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, 243 init_flags, options, fs->fs_mntops); 244 break; 245 case 2: 246 /* 247 * If -t flag has not been specified, and spec contains either 248 * a ':' or a '@' then assume that an NFS filesystem is being 249 * specified ala Sun. 250 */ 251 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL) 252 vfstype = "nfs"; 253 rval = mountfs(vfstype, 254 argv[0], argv[1], init_flags, options, NULL); 255 break; 256 default: 257 usage(); 258 /* NOTREACHED */ 259 } 260 261 /* 262 * If the mount was successfully, and done by root, tell mountd the 263 * good news. Pid checks are probably unnecessary, but don't hurt. 264 */ 265 if (rval == 0 && getuid() == 0 && 266 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 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} 275 276int 277ismounted(fs, mntbuf, mntsize) 278 struct fstab *fs; 279 struct statfs *mntbuf; 280 int mntsize; 281{ 282 int i; 283 284 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0') 285 /* the root file system can always be remounted */ 286 return (0); 287 288 for (i = mntsize - 1; i >= 0; --i) 289 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 && 290 (!isremountable(fs->fs_vfstype) || 291 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0)) 292 return (1); 293 return (0); 294} 295 296int 297isremountable(vfsname) 298 const char *vfsname; 299{ 300 const char **cp; 301 302 for (cp = remountable_fs_names; *cp; cp++) 303 if (strcmp(*cp, vfsname) == 0) 304 return (1); 305 return (0); 306} 307 308int 309hasopt(mntopts, option) 310 const char *mntopts, *option; 311{ 312 int negative, found; 313 char *opt, *optbuf; 314 315 if (option[0] == 'n' && option[1] == 'o') { 316 negative = 1; 317 option += 2; 318 } else 319 negative = 0; 320 optbuf = strdup(mntopts); 321 found = 0; 322 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 323 if (opt[0] == 'n' && opt[1] == 'o') { 324 if (!strcasecmp(opt + 2, option)) 325 found = negative; 326 } else if (!strcasecmp(opt, option)) 327 found = !negative; 328 } 329 free(optbuf); 330 return (found); 331} 332 333int 334mountfs(vfstype, spec, name, flags, options, mntopts) 335 const char *vfstype, *spec, *name, *options, *mntopts; 336 int flags; 337{ 338 /* List of directories containing mount_xxx subcommands. */ 339 static const char *edirs[] = { 340 _PATH_SBIN, 341 _PATH_USRSBIN, 342 NULL 343 }; 344 const char *argv[100], **edir; 345 struct stat sb; 346 struct statfs sf; 347 pid_t pid; 348 int argc, i, status; 349 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; 350 351#if __GNUC__ 352 (void)&optbuf; 353 (void)&name; 354#endif 355 356 if (realpath(name, mntpath) != NULL && stat(mntpath, &sb) == 0) { 357 if (!S_ISDIR(sb.st_mode)) { 358 warnx("%s: not a directory", mntpath); 359 return (1); 360 } 361 } else { 362 warn("%s", mntpath); 363 return (1); 364 } 365 366 name = mntpath; 367 368 if (mntopts == NULL) 369 mntopts = ""; 370 if (options == NULL) { 371 if (*mntopts == '\0') { 372 options = "rw"; 373 } else { 374 options = mntopts; 375 mntopts = ""; 376 } 377 } 378 optbuf = catopt(strdup(mntopts), options); 379 380 if (strcmp(name, "/") == 0) 381 flags |= MNT_UPDATE; 382 if (flags & MNT_FORCE) 383 optbuf = catopt(optbuf, "force"); 384 if (flags & MNT_RDONLY) 385 optbuf = catopt(optbuf, "ro"); 386 /* 387 * XXX 388 * The mount_mfs (newfs) command uses -o to select the 389 * optimization mode. We don't pass the default "-o rw" 390 * for that reason. 391 */ 392 if (flags & MNT_UPDATE) 393 optbuf = catopt(optbuf, "update"); 394 395 argc = 0; 396 argv[argc++] = vfstype; 397 mangle(optbuf, &argc, argv); 398 argv[argc++] = spec; 399 argv[argc++] = name; 400 argv[argc] = NULL; 401 402 if (debug) { 403 (void)printf("exec: mount_%s", vfstype); 404 for (i = 1; i < argc; i++) 405 (void)printf(" %s", argv[i]); 406 (void)printf("\n"); 407 return (0); 408 } 409 410 switch (pid = fork()) { 411 case -1: /* Error. */ 412 warn("fork"); 413 free(optbuf); 414 return (1); 415 case 0: /* Child. */ 416 if (strcmp(vfstype, "ufs") == 0) 417 exit(mount_ufs(argc, (char * const *) argv)); 418 419 /* Go find an executable. */ 420 for (edir = edirs; *edir; edir++) { 421 (void)snprintf(execname, 422 sizeof(execname), "%s/mount_%s", *edir, vfstype); 423 execv(execname, (char * const *)argv); 424 } 425 if (errno == ENOENT) { 426 int len = 0; 427 char *cp; 428 for (edir = edirs; *edir; edir++) 429 len += strlen(*edir) + 2; /* ", " */ 430 if ((cp = malloc(len)) == NULL) 431 errx(1, "malloc failed"); 432 cp[0] = '\0'; 433 for (edir = edirs; *edir; edir++) { 434 strcat(cp, *edir); 435 if (edir[1] != NULL) 436 strcat(cp, ", "); 437 } 438 warn("exec mount_%s not found in %s", vfstype, cp); 439 } 440 exit(1); 441 /* NOTREACHED */ 442 default: /* Parent. */ 443 free(optbuf); 444 445 if (waitpid(pid, &status, 0) < 0) { 446 warn("waitpid"); 447 return (1); 448 } 449 450 if (WIFEXITED(status)) { 451 if (WEXITSTATUS(status) != 0) 452 return (WEXITSTATUS(status)); 453 } else if (WIFSIGNALED(status)) { 454 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]); 455 return (1); 456 } 457 458 if (verbose) { 459 if (statfs(name, &sf) < 0) { 460 warn("statfs %s", name); 461 return (1); 462 } 463 if (fstab_style) 464 putfsent(&sf); 465 else 466 prmount(&sf); 467 } 468 break; 469 } 470 471 return (0); 472} 473 474void 475prmount(sfp) 476 struct statfs *sfp; 477{ 478 int flags; 479 struct opt *o; 480 struct passwd *pw; 481 int f; 482 483 (void)printf("%s on %s", sfp->f_mntfromname, sfp->f_mntonname); 484 485 flags = sfp->f_flags & MNT_VISFLAGMASK; 486 for (f = 0, o = optnames; flags && o->o_opt; o++) 487 if (flags & o->o_opt) { 488 (void)printf("%s%s", !f++ ? " (" : ", ", o->o_name); 489 flags &= ~o->o_opt; 490 } 491 if (sfp->f_owner) { 492 (void)printf("%smounted by ", !f++ ? " (" : ", "); 493 if ((pw = getpwuid(sfp->f_owner)) != NULL) 494 (void)printf("%s", pw->pw_name); 495 else 496 (void)printf("%d", sfp->f_owner); 497 } 498 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0) 499 (void)printf("%swrites: sync %ld async %ld", 500 !f++ ? " (" : ", ", sfp->f_syncwrites, sfp->f_asyncwrites); 501 (void)printf("%s\n", f ? ")" : ""); 502} 503 504struct statfs * 505getmntpt(name) 506 const char *name; 507{ 508 struct statfs *mntbuf; 509 int i, mntsize; 510 511 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 512 for (i = 0; i < mntsize; i++) 513 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 514 strcmp(mntbuf[i].f_mntonname, name) == 0) 515 return (&mntbuf[i]); 516 return (NULL); 517} 518 519char * 520catopt(s0, s1) 521 char *s0; 522 const char *s1; 523{ 524 size_t i; 525 char *cp; 526 527 if (s0 && *s0) { 528 i = strlen(s0) + strlen(s1) + 1 + 1; 529 if ((cp = malloc(i)) == NULL) 530 errx(1, "malloc failed"); 531 (void)snprintf(cp, i, "%s,%s", s0, s1); 532 } else 533 cp = strdup(s1); 534 535 if (s0) 536 free(s0); 537 return (cp); 538} 539 540void 541mangle(options, argcp, argv) 542 char *options; 543 int *argcp; 544 const char **argv; 545{ 546 char *p, *s; 547 int argc; 548 549 argc = *argcp; 550 for (s = options; (p = strsep(&s, ",")) != NULL;) 551 if (*p != '\0') 552 if (*p == '-') { 553 argv[argc++] = p; 554 p = strchr(p, '='); 555 if (p) { 556 *p = '\0'; 557 argv[argc++] = p+1; 558 } 559 } else if (strcmp(p, "rw") != 0) { 560 argv[argc++] = "-o"; 561 argv[argc++] = p; 562 } 563 564 *argcp = argc; 565} 566 567void 568usage() 569{ 570 571 (void)fprintf(stderr, "%s\n%s\n%s\n", 572"usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node", 573" mount [-adfpruvw] [-t ufs | external_type]", 574" mount [-dfpruvw] special | node"); 575 exit(1); 576} 577 578void 579putfsent(ent) 580 const struct statfs *ent; 581{ 582 struct fstab *fst; 583 584 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname, 585 ent->f_fstypename, (ent->f_flags & MNT_RDONLY) ? "ro" : "rw"); 586 587 /* XXX should use optnames[] - put shorter names in it. */ 588 if (ent->f_flags & MNT_SYNCHRONOUS) 589 printf(",sync"); 590 if (ent->f_flags & MNT_NOEXEC) 591 printf(",noexec"); 592 if (ent->f_flags & MNT_NOSUID) 593 printf(",nosuid"); 594 if (ent->f_flags & MNT_NODEV) 595 printf(",nodev"); 596 if (ent->f_flags & MNT_UNION) 597 printf(",union"); 598 if (ent->f_flags & MNT_ASYNC) 599 printf(",async"); 600 if (ent->f_flags & MNT_NOATIME) 601 printf(",noatime"); 602 if (ent->f_flags & MNT_NOCLUSTERR) 603 printf(",noclusterr"); 604 if (ent->f_flags & MNT_NOCLUSTERW) 605 printf(",noclusterw"); 606 if (ent->f_flags & MNT_NOSYMFOLLOW) 607 printf (",nosymfollow"); 608 if (ent->f_flags & MNT_SUIDDIR) 609 printf(",suiddir"); 610 611 if ((fst = getfsspec(ent->f_mntfromname))) 612 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 613 else if ((fst = getfsfile(ent->f_mntonname))) 614 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 615 else if (strcmp(ent->f_fstypename, "ufs") == 0) 616 printf("\t1 1\n"); 617 else 618 printf("\t0 0\n"); 619} 620