Home | History | Annotate | Line # | Download | only in mount
mount.c revision 1.22 
      1 /*	$NetBSD: mount.c,v 1.22 1995/07/12 06:05:04 cgd 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 #ifndef lint
     37 static char copyright[] =
     38 "@(#) 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	8.19 (Berkeley) 4/19/94";
     45 #else
     46 static char rcsid[] = "$NetBSD: mount.c,v 1.22 1995/07/12 06:05:04 cgd 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 <signal.h>
     58 #include <stdio.h>
     59 #include <stdlib.h>
     60 #include <string.h>
     61 #include <unistd.h>
     62 
     63 #include "pathnames.h"
     64 
     65 int	debug, verbose;
     66 char	**typelist = NULL;
     67 
     68 int	selected __P((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 void	maketypelist __P((char *));
     74 void	mangle __P((char *, int *, const char **));
     75 int	mountfs __P((const char *, const char *, const char *,
     76 			int, const char *, const char *, int));
     77 void	prmount __P((struct statfs *));
     78 void	usage __P((void));
     79 
     80 /* Map from mount otions to printable formats. */
     81 static struct opt {
     82 	int o_opt;
     83 	const char *o_name;
     84 } optnames[] = {
     85 	{ MNT_ASYNC,		"asynchronous" },
     86 	{ MNT_EXPORTED,		"NFS exported" },
     87 	{ MNT_LOCAL,		"local" },
     88 	{ MNT_NODEV,		"nodev" },
     89 	{ MNT_NOEXEC,		"noexec" },
     90 	{ MNT_NOSUID,		"nosuid" },
     91 	{ MNT_QUOTA,		"with quotas" },
     92 	{ MNT_RDONLY,		"read-only" },
     93 	{ MNT_SYNCHRONOUS,	"synchronous" },
     94 	{ MNT_UNION,		"union" },
     95 	{ NULL }
     96 };
     97 
     98 int
     99 main(argc, argv)
    100 	int argc;
    101 	char * const argv[];
    102 {
    103 	const char *mntonname, *vfstype;
    104 	struct fstab *fs;
    105 	struct statfs *mntbuf;
    106 	FILE *mountdfp;
    107 	pid_t pid;
    108 	int all, ch, forceall, i, init_flags, mntsize, rval;
    109 	char *options;
    110 
    111 	all = forceall = init_flags = 0;
    112 	options = NULL;
    113 	vfstype = "ufs";
    114 	while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != EOF)
    115 		switch (ch) {
    116 		case 'A':
    117 			all = forceall = 1;
    118 			break;
    119 		case 'a':
    120 			all = 1;
    121 			break;
    122 		case 'd':
    123 			debug = 1;
    124 			break;
    125 		case 'f':
    126 			init_flags |= MNT_FORCE;
    127 			break;
    128 		case 'o':
    129 			if (*optarg)
    130 				options = catopt(options, optarg);
    131 			break;
    132 		case 'r':
    133 			init_flags |= MNT_RDONLY;
    134 			break;
    135 		case 't':
    136 			if (typelist != NULL)
    137 				errx(1, "only one -t option may be specified.");
    138 			maketypelist(optarg);
    139 			vfstype = optarg;
    140 			break;
    141 		case 'u':
    142 			init_flags |= MNT_UPDATE;
    143 			break;
    144 		case 'v':
    145 			verbose = 1;
    146 			break;
    147 		case 'w':
    148 			init_flags &= ~MNT_RDONLY;
    149 			break;
    150 		case '?':
    151 		default:
    152 			usage();
    153 			/* NOTREACHED */
    154 		}
    155 	argc -= optind;
    156 	argv += optind;
    157 
    158 #define	BADTYPE(type)							\
    159 	(strcmp(type, FSTAB_RO) &&					\
    160 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    161 
    162 	rval = 0;
    163 	switch (argc) {
    164 	case 0:
    165 		if (all)
    166 			while ((fs = getfsent()) != NULL) {
    167 				if (BADTYPE(fs->fs_type))
    168 					continue;
    169 				if (!selected(fs->fs_vfstype))
    170 					continue;
    171 				if (hasopt(fs->fs_mntops, "noauto"))
    172 					continue;
    173 				if (mountfs(fs->fs_vfstype, fs->fs_spec,
    174 				    fs->fs_file, init_flags, options,
    175 				    fs->fs_mntops, !forceall))
    176 					rval = 1;
    177 			}
    178 		else {
    179 			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
    180 				err(1, "getmntinfo");
    181 			for (i = 0; i < mntsize; i++) {
    182 				if (!selected(mntbuf[i].f_fstypename))
    183 					continue;
    184 				prmount(&mntbuf[i]);
    185 			}
    186 		}
    187 		exit(rval);
    188 	case 1:
    189 		if (typelist != NULL)
    190 			usage();
    191 
    192 		if (init_flags & MNT_UPDATE) {
    193 			if ((mntbuf = getmntpt(*argv)) == NULL)
    194 				errx(1,
    195 				    "unknown special file or file system %s.",
    196 				    *argv);
    197 			if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL)
    198 				errx(1, "can't find fstab entry for %s.",
    199 				    *argv);
    200 			/* If it's an update, ignore the fstab file options. */
    201 			fs->fs_mntops = NULL;
    202 			mntonname = mntbuf->f_mntonname;
    203 		} else {
    204 			if ((fs = getfsfile(*argv)) == NULL &&
    205 			    (fs = getfsspec(*argv)) == NULL)
    206 				errx(1,
    207 				    "%s: unknown special file or file system.",
    208 				    *argv);
    209 			if (BADTYPE(fs->fs_type))
    210 				errx(1, "%s has unknown file system type.",
    211 				    *argv);
    212 			mntonname = fs->fs_file;
    213 		}
    214 		rval = mountfs(fs->fs_vfstype, fs->fs_spec,
    215 		    mntonname, init_flags, options, fs->fs_mntops, 0);
    216 		break;
    217 	case 2:
    218 		/*
    219 		 * If -t flag has not been specified, and spec contains either
    220 		 * a ':' or a '@' then assume that an NFS filesystem is being
    221 		 * specified ala Sun.
    222 		 */
    223 		if (typelist == NULL && strpbrk(argv[0], ":@") != NULL)
    224 			vfstype = "nfs";
    225 		rval = mountfs(vfstype,
    226 		    argv[0], argv[1], init_flags, options, NULL, 0);
    227 		break;
    228 	default:
    229 		usage();
    230 		/* NOTREACHED */
    231 	}
    232 
    233 	/*
    234 	 * If the mount was successfully, and done by root, tell mountd the
    235 	 * good news.  Pid checks are probably unnecessary, but don't hurt.
    236 	 */
    237 	if (rval == 0 && getuid() == 0 &&
    238 	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
    239 		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
    240 		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
    241 			err(1, "signal mountd");
    242 		(void)fclose(mountdfp);
    243 	}
    244 
    245 	exit(rval);
    246 }
    247 
    248 int
    249 hasopt(mntopts, option)
    250 	const char *mntopts, *option;
    251 {
    252 	int negative, found;
    253 	char *opt, *optbuf;
    254 
    255 	if (option[0] == 'n' && option[1] == 'o') {
    256 		negative = 1;
    257 		option += 2;
    258 	} else
    259 		negative = 0;
    260 	optbuf = strdup(mntopts);
    261 	found = 0;
    262 	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
    263 		if (opt[0] == 'n' && opt[1] == 'o') {
    264 			if (!strcasecmp(opt + 2, option))
    265 				found = negative;
    266 		} else if (!strcasecmp(opt, option))
    267 			found = !negative;
    268 	}
    269 	free(optbuf);
    270 	return (found);
    271 }
    272 
    273 int
    274 mountfs(vfstype, spec, name, flags, options, mntopts, skipmounted)
    275 	const char *vfstype, *spec, *name, *options, *mntopts;
    276 	int flags, skipmounted;
    277 {
    278 	/* List of directories containing mount_xxx subcommands. */
    279 	static const char *edirs[] = {
    280 		_PATH_SBIN,
    281 		_PATH_USRSBIN,
    282 		NULL
    283 	};
    284 	const char *argv[100], **edir;
    285 	struct statfs sf;
    286 	pid_t pid;
    287 	int argc, i, status;
    288 	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
    289 
    290 	if (realpath(name, mntpath) == NULL) {
    291 		warn("realpath %s", name);
    292 		return (1);
    293 	}
    294 
    295 	name = mntpath;
    296 
    297 	if (mntopts == NULL)
    298 		mntopts = "";
    299 	if (options == NULL) {
    300 		if (*mntopts == '\0')
    301 			options = "rw";
    302 		else {
    303 			options = mntopts;
    304 			mntopts = "";
    305 		}
    306 	}
    307 	optbuf = catopt(strdup(mntopts), options);
    308 
    309 	if (strcmp(name, "/") == 0)
    310 		flags |= MNT_UPDATE;
    311 	else if (skipmounted) {
    312 		if (statfs(name, &sf) < 0) {
    313 			warn("statfs %s", name);
    314 			return (1);
    315 		}
    316 		/* XXX can't check f_mntfromname, thanks to mfs, union, etc. */
    317 		if (strncmp(name, sf.f_mntonname, MNAMELEN) == 0 &&
    318 		    strncmp(vfstype, sf.f_fstypename, MFSNAMELEN) == 0) {
    319 			if (verbose)
    320 				(void)printf("%s on %s type %.*s: %s\n",
    321 				    sf.f_mntfromname, sf.f_mntonname,
    322 			            MFSNAMELEN, sf.f_fstypename,
    323 				    "already mounted");
    324 			return (0);
    325 		}
    326 	}
    327 	if (flags & MNT_FORCE)
    328 		optbuf = catopt(optbuf, "force");
    329 	if (flags & MNT_RDONLY)
    330 		optbuf = catopt(optbuf, "ro");
    331 	/*
    332 	 * XXX
    333 	 * The mount_mfs (newfs) command uses -o to select the
    334 	 * optimisation mode.  We don't pass the default "-o rw"
    335 	 * for that reason.
    336 	 */
    337 	if (flags & MNT_UPDATE)
    338 		optbuf = catopt(optbuf, "update");
    339 
    340 	argc = 0;
    341 	argv[argc++] = vfstype;
    342 	mangle(optbuf, &argc, argv);
    343 	argv[argc++] = spec;
    344 	argv[argc++] = name;
    345 	argv[argc] = NULL;
    346 
    347 	if (debug) {
    348 		(void)printf("exec: mount_%s", vfstype);
    349 		for (i = 1; i < argc; i++)
    350 			(void)printf(" %s", argv[i]);
    351 		(void)printf("\n");
    352 		return (0);
    353 	}
    354 
    355 	switch (pid = vfork()) {
    356 	case -1:				/* Error. */
    357 		warn("vfork");
    358 		free(optbuf);
    359 		return (1);
    360 	case 0:					/* Child. */
    361 		/* Go find an executable. */
    362 		edir = edirs;
    363 		do {
    364 			(void)snprintf(execname,
    365 			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
    366 			execv(execname, (char * const *)argv);
    367 			if (errno != ENOENT)
    368 				warn("exec %s for %s", execname, name);
    369 		} while (*++edir != NULL);
    370 
    371 		if (errno == ENOENT)
    372 			warn("exec %s for %s", execname, name);
    373 		exit(1);
    374 		/* NOTREACHED */
    375 	default:				/* Parent. */
    376 		free(optbuf);
    377 
    378 		if (waitpid(pid, &status, 0) < 0) {
    379 			warn("waitpid");
    380 			return (1);
    381 		}
    382 
    383 		if (WIFEXITED(status)) {
    384 			if (WEXITSTATUS(status) != 0)
    385 				return (WEXITSTATUS(status));
    386 		} else if (WIFSIGNALED(status)) {
    387 			warnx("%s: %s", name, strsignal(WTERMSIG(status)));
    388 			return (1);
    389 		}
    390 
    391 		if (verbose) {
    392 			if (statfs(name, &sf) < 0) {
    393 				warn("statfs %s", name);
    394 				return (1);
    395 			}
    396 			prmount(&sf);
    397 		}
    398 		break;
    399 	}
    400 
    401 	return (0);
    402 }
    403 
    404 void
    405 prmount(sf)
    406 	struct statfs *sf;
    407 {
    408 	int flags;
    409 	struct opt *o;
    410 	int f;
    411 
    412 	(void)printf("%s on %s type %.*s", sf->f_mntfromname, sf->f_mntonname,
    413 	    MFSNAMELEN, sf->f_fstypename);
    414 
    415 	flags = sf->f_flags & MNT_VISFLAGMASK;
    416 	for (f = 0, o = optnames; flags && o->o_opt; o++)
    417 		if (flags & o->o_opt) {
    418 			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
    419 			flags &= ~o->o_opt;
    420 		}
    421 	(void)printf(f ? ")\n" : "\n");
    422 }
    423 
    424 struct statfs *
    425 getmntpt(name)
    426 	const char *name;
    427 {
    428 	struct statfs *mntbuf;
    429 	int i, mntsize;
    430 
    431 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    432 	for (i = 0; i < mntsize; i++)
    433 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
    434 		    strcmp(mntbuf[i].f_mntonname, name) == 0)
    435 			return (&mntbuf[i]);
    436 	return (NULL);
    437 }
    438 
    439 static enum { IN_LIST, NOT_IN_LIST } which;
    440 
    441 int
    442 selected(type)
    443 	const char *type;
    444 {
    445 	char **av;
    446 
    447 	/* If no type specified, it's always selected. */
    448 	if (typelist == NULL)
    449 		return (1);
    450 	for (av = typelist; *av != NULL; ++av)
    451 		if (!strncmp(type, *av, MFSNAMELEN))
    452 			return (which == IN_LIST ? 1 : 0);
    453 	return (which == IN_LIST ? 0 : 1);
    454 }
    455 
    456 void
    457 maketypelist(fslist)
    458 	char *fslist;
    459 {
    460 	int i;
    461 	char *nextcp, **av;
    462 
    463 	if ((fslist == NULL) || (fslist[0] == '\0'))
    464 		errx(1, "empty type list");
    465 
    466 	/*
    467 	 * XXX
    468 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
    469 	 * no yyy's, not the more intuitive "noyyy,noyyy".
    470 	 */
    471 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    472 		fslist += 2;
    473 		which = NOT_IN_LIST;
    474 	} else
    475 		which = IN_LIST;
    476 
    477 	/* Count the number of types. */
    478 	for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++)
    479 		++nextcp;
    480 
    481 	/* Build an array of that many types. */
    482 	if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
    483 		err(1, NULL);
    484 	av[0] = fslist;
    485 	for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) {
    486 		*nextcp = '\0';
    487 		av[i] = ++nextcp;
    488 	}
    489 	/* Terminate the array. */
    490 	av[i] = NULL;
    491 }
    492 
    493 char *
    494 catopt(s0, s1)
    495 	char *s0;
    496 	const char *s1;
    497 {
    498 	size_t i;
    499 	char *cp;
    500 
    501 	if (s0 && *s0) {
    502 		i = strlen(s0) + strlen(s1) + 1 + 1;
    503 		if ((cp = malloc(i)) == NULL)
    504 			err(1, NULL);
    505 		(void)snprintf(cp, i, "%s,%s", s0, s1);
    506 	} else
    507 		cp = strdup(s1);
    508 
    509 	if (s0)
    510 		free(s0);
    511 	return (cp);
    512 }
    513 
    514 void
    515 mangle(options, argcp, argv)
    516 	char *options;
    517 	int *argcp;
    518 	const char **argv;
    519 {
    520 	char *p, *s;
    521 	int argc;
    522 
    523 	argc = *argcp;
    524 	for (s = options; (p = strsep(&s, ",")) != NULL;)
    525 		if (*p != '\0')
    526 			if (*p == '-') {
    527 				argv[argc++] = p;
    528 				p = strchr(p, '=');
    529 				if (p) {
    530 					*p = '\0';
    531 					argv[argc++] = p+1;
    532 				}
    533 			} else if (strcmp(p, "rw") != 0) {
    534 				argv[argc++] = "-o";
    535 				argv[argc++] = p;
    536 			}
    537 
    538 	*argcp = argc;
    539 }
    540 
    541 void
    542 usage()
    543 {
    544 
    545 	(void)fprintf(stderr,
    546 		"usage: mount %s %s\n       mount %s\n       mount %s\n",
    547 		"[-dfruvw] [-o options] [-t ufs | external_type]",
    548 			"special node",
    549 		"[-adfruvw] [-t ufs | external_type]",
    550 		"[-dfruvw] special | node");
    551 	exit(1);
    552 }
    553