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mount.c revision 1.15 
      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
     35 static 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 /*static char sccsid[] = "from: @(#)mount.c	8.19 (Berkeley) 4/19/94";*/
     42 static char *rcsid = "$Id: mount.c,v 1.15 1995/01/30 17:22:42 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/mount.h>
     47 #include <sys/wait.h>
     48 
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <fstab.h>
     52 #include <signal.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 
     58 #include "pathnames.h"
     59 
     60 int	debug, verbose;
     61 char	**typelist = NULL;
     62 
     63 int	selected __P((const char *));
     64 char   *catopt __P((char *, const char *));
     65 struct statfs
     66        *getmntpt __P((const char *));
     67 int	hasopt __P((const char *, const char *));
     68 void	maketypelist __P((char *));
     69 void	mangle __P((char *, int *, const char **));
     70 int	mountfs __P((const char *, const char *, const char *,
     71 			int, const char *, const char *));
     72 void	prmount __P((struct statfs *));
     73 void	usage __P((void));
     74 
     75 /* From mount_ufs.c. */
     76 int	mount_ufs __P((int, char * const *));
     77 
     78 /* Map from mount otions to printable formats. */
     79 static struct opt {
     80 	int o_opt;
     81 	const char *o_name;
     82 } optnames[] = {
     83 	{ MNT_ASYNC,		"asynchronous" },
     84 	{ MNT_EXPORTED,		"NFS exported" },
     85 	{ MNT_LOCAL,		"local" },
     86 	{ MNT_NODEV,		"nodev" },
     87 	{ MNT_NOEXEC,		"noexec" },
     88 	{ MNT_NOSUID,		"nosuid" },
     89 	{ MNT_QUOTA,		"with quotas" },
     90 	{ MNT_RDONLY,		"read-only" },
     91 	{ MNT_SYNCHRONOUS,	"synchronous" },
     92 	{ MNT_UNION,		"union" },
     93 	{ NULL }
     94 };
     95 
     96 int
     97 main(argc, argv)
     98 	int argc;
     99 	char * const argv[];
    100 {
    101 	const char *mntonname, *vfstype;
    102 	struct fstab *fs;
    103 	struct statfs *mntbuf;
    104 	FILE *mountdfp;
    105 	pid_t pid;
    106 	int all, ch, i, init_flags, mntsize, rval;
    107 	char *options;
    108 
    109 	all = init_flags = 0;
    110 	options = NULL;
    111 	vfstype = "ufs";
    112 	while ((ch = getopt(argc, argv, "adfo:rwt:uv")) != EOF)
    113 		switch (ch) {
    114 		case 'a':
    115 			all = 1;
    116 			break;
    117 		case 'd':
    118 			debug = 1;
    119 			break;
    120 		case 'f':
    121 			init_flags |= MNT_FORCE;
    122 			break;
    123 		case 'o':
    124 			if (*optarg)
    125 				options = catopt(options, optarg);
    126 			break;
    127 		case 'r':
    128 			init_flags |= MNT_RDONLY;
    129 			break;
    130 		case 't':
    131 			if (typelist != NULL)
    132 				errx(1, "only one -t option may be specified.");
    133 			maketypelist(optarg);
    134 			vfstype = optarg;
    135 			break;
    136 		case 'u':
    137 			init_flags |= MNT_UPDATE;
    138 			break;
    139 		case 'v':
    140 			verbose = 1;
    141 			break;
    142 		case 'w':
    143 			init_flags &= ~MNT_RDONLY;
    144 			break;
    145 		case '?':
    146 		default:
    147 			usage();
    148 			/* NOTREACHED */
    149 		}
    150 	argc -= optind;
    151 	argv += optind;
    152 
    153 #define	BADTYPE(type)							\
    154 	(strcmp(type, FSTAB_RO) &&					\
    155 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    156 
    157 	rval = 0;
    158 	switch (argc) {
    159 	case 0:
    160 		if (all)
    161 			while ((fs = getfsent()) != NULL) {
    162 				if (BADTYPE(fs->fs_type))
    163 					continue;
    164 				if (!selected(fs->fs_vfstype))
    165 					continue;
    166 				if (hasopt(fs->fs_mntops, "noauto"))
    167 					continue;
    168 				if (mountfs(fs->fs_vfstype, fs->fs_spec,
    169 				    fs->fs_file, init_flags, options,
    170 				    fs->fs_mntops))
    171 					rval = 1;
    172 			}
    173 		else {
    174 			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
    175 				err(1, "getmntinfo");
    176 			for (i = 0; i < mntsize; i++) {
    177 				if (!selected(mntbuf[i].f_fstypename))
    178 					continue;
    179 				prmount(&mntbuf[i]);
    180 			}
    181 		}
    182 		exit(rval);
    183 	case 1:
    184 		if (typelist != NULL)
    185 			usage();
    186 
    187 		if (init_flags & MNT_UPDATE) {
    188 			if ((mntbuf = getmntpt(*argv)) == NULL)
    189 				errx(1,
    190 				    "unknown special file or file system %s.",
    191 				    *argv);
    192 			if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL)
    193 				errx(1, "can't find fstab entry for %s.",
    194 				    *argv);
    195 			/* If it's an update, ignore the fstab file options. */
    196 			fs->fs_mntops = NULL;
    197 			mntonname = mntbuf->f_mntonname;
    198 		} else {
    199 			if ((fs = getfsfile(*argv)) == NULL &&
    200 			    (fs = getfsspec(*argv)) == NULL)
    201 				errx(1,
    202 				    "%s: unknown special file or file system.",
    203 				    *argv);
    204 			if (BADTYPE(fs->fs_type))
    205 				errx(1, "%s has unknown file system type.",
    206 				    *argv);
    207 			mntonname = fs->fs_file;
    208 		}
    209 		rval = mountfs(fs->fs_vfstype, fs->fs_spec,
    210 		    mntonname, init_flags, options, fs->fs_mntops);
    211 		break;
    212 	case 2:
    213 		/*
    214 		 * If -t flag has not been specified, and spec contains either
    215 		 * a ':' or a '@' then assume that an NFS filesystem is being
    216 		 * specified ala Sun.
    217 		 */
    218 		if (typelist == NULL && strpbrk(argv[0], ":@") != NULL)
    219 			vfstype = "nfs";
    220 		rval = mountfs(vfstype,
    221 		    argv[0], argv[1], init_flags, options, NULL);
    222 		break;
    223 	default:
    224 		usage();
    225 		/* NOTREACHED */
    226 	}
    227 
    228 	/*
    229 	 * If the mount was successfully, and done by root, tell mountd the
    230 	 * good news.  Pid checks are probably unnecessary, but don't hurt.
    231 	 */
    232 	if (rval == 0 && getuid() == 0 &&
    233 	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
    234 		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
    235 		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
    236 			err(1, "signal mountd");
    237 		(void)fclose(mountdfp);
    238 	}
    239 
    240 	exit(rval);
    241 }
    242 
    243 int
    244 hasopt(mntopts, option)
    245 	const char *mntopts, *option;
    246 {
    247 	int negative, found;
    248 	char *opt, *optbuf;
    249 
    250 	if (option[0] == 'n' && option[1] == 'o') {
    251 		negative = 1;
    252 		option += 2;
    253 	} else
    254 		negative = 0;
    255 	optbuf = strdup(mntopts);
    256 	found = 0;
    257 	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
    258 		if (opt[0] == 'n' && opt[1] == 'o') {
    259 			if (!strcasecmp(opt + 2, option))
    260 				found = negative;
    261 		} else if (!strcasecmp(opt, option))
    262 			found = !negative;
    263 	}
    264 	free(optbuf);
    265 	return (found);
    266 }
    267 
    268 int
    269 mountfs(vfstype, spec, name, flags, options, mntopts)
    270 	const char *vfstype, *spec, *name, *options, *mntopts;
    271 	int flags;
    272 {
    273 	/* List of directories containing mount_xxx subcommands. */
    274 	static const char *edirs[] = {
    275 		_PATH_SBIN,
    276 		_PATH_USRSBIN,
    277 		NULL
    278 	};
    279 	const char *argv[100], **edir;
    280 	struct statfs sf;
    281 	pid_t pid;
    282 	int argc, i, status;
    283 	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
    284 
    285 	if (realpath(name, mntpath) == NULL) {
    286 		warn("realpath %s", mntpath);
    287 		return (1);
    288 	}
    289 
    290 	name = mntpath;
    291 
    292 	if (mntopts == NULL)
    293 		mntopts = "";
    294 	if (options == NULL) {
    295 		if (*mntopts == '\0')
    296 			options = "rw";
    297 		else {
    298 			options = mntopts;
    299 			mntopts = "";
    300 		}
    301 	}
    302 	optbuf = catopt(strdup(mntopts), options);
    303 
    304 	if (strcmp(name, "/") == 0)
    305 		flags |= MNT_UPDATE;
    306 	if (flags & MNT_FORCE)
    307 		optbuf = catopt(optbuf, "force");
    308 	if (flags & MNT_RDONLY)
    309 		optbuf = catopt(optbuf, "ro");
    310 	/*
    311 	 * XXX
    312 	 * The mount_mfs (newfs) command uses -o to select the
    313 	 * optimisation mode.  We don't pass the default "-o rw"
    314 	 * for that reason.
    315 	 */
    316 	if (flags & MNT_UPDATE)
    317 		optbuf = catopt(optbuf, "update");
    318 
    319 	argc = 0;
    320 	argv[argc++] = vfstype;
    321 	mangle(optbuf, &argc, argv);
    322 	argv[argc++] = spec;
    323 	argv[argc++] = name;
    324 	argv[argc] = NULL;
    325 
    326 	if (debug) {
    327 		(void)printf("exec: mount_%s", vfstype);
    328 		for (i = 1; i < argc; i++)
    329 			(void)printf(" %s", argv[i]);
    330 		(void)printf("\n");
    331 		return (0);
    332 	}
    333 
    334 	switch (pid = vfork()) {
    335 	case -1:				/* Error. */
    336 		warn("vfork");
    337 		free(optbuf);
    338 		return (1);
    339 	case 0:					/* Child. */
    340 		if (strcmp(vfstype, "ufs") == 0)
    341 			exit(mount_ufs(argc, (char * const *) argv));
    342 
    343 		/* Go find an executable. */
    344 		edir = edirs;
    345 		do {
    346 			(void)snprintf(execname,
    347 			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
    348 			execv(execname, (char * const *)argv);
    349 			if (errno != ENOENT)
    350 				warn("exec %s for %s", execname, name);
    351 		} while (*++edir != NULL);
    352 
    353 		if (errno == ENOENT)
    354 			warn("exec %s for %s", execname, name);
    355 		exit(1);
    356 		/* NOTREACHED */
    357 	default:				/* Parent. */
    358 		free(optbuf);
    359 
    360 		if (waitpid(pid, &status, 0) < 0) {
    361 			warn("waitpid");
    362 			return (1);
    363 		}
    364 
    365 		if (WIFEXITED(status)) {
    366 			if (WEXITSTATUS(status) != 0)
    367 				return (WEXITSTATUS(status));
    368 		} else if (WIFSIGNALED(status)) {
    369 			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
    370 			return (1);
    371 		}
    372 
    373 		if (verbose) {
    374 			if (statfs(name, &sf) < 0) {
    375 				warn("statfs %s", name);
    376 				return (1);
    377 			}
    378 			prmount(&sf);
    379 		}
    380 		break;
    381 	}
    382 
    383 	return (0);
    384 }
    385 
    386 void
    387 prmount(sf)
    388 	struct statfs *sf;
    389 {
    390 	int flags;
    391 	struct opt *o;
    392 	int f;
    393 
    394 	(void)printf("%s on %s type %s", sf->f_mntfromname, sf->f_mntonname,
    395 	    sf->f_fstypename);
    396 
    397 	flags = sf->f_flags & MNT_VISFLAGMASK;
    398 	for (f = 0, o = optnames; flags && o->o_opt; o++)
    399 		if (flags & o->o_opt) {
    400 			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
    401 			flags &= ~o->o_opt;
    402 		}
    403 	(void)printf(f ? ")\n" : "\n");
    404 }
    405 
    406 struct statfs *
    407 getmntpt(name)
    408 	const char *name;
    409 {
    410 	struct statfs *mntbuf;
    411 	int i, mntsize;
    412 
    413 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    414 	for (i = 0; i < mntsize; i++)
    415 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
    416 		    strcmp(mntbuf[i].f_mntonname, name) == 0)
    417 			return (&mntbuf[i]);
    418 	return (NULL);
    419 }
    420 
    421 static enum { IN_LIST, NOT_IN_LIST } which;
    422 
    423 int
    424 selected(type)
    425 	const char *type;
    426 {
    427 	char **av;
    428 
    429 	/* If no type specified, it's always selected. */
    430 	if (typelist == NULL)
    431 		return (1);
    432 	for (av = typelist; *av != NULL; ++av)
    433 		if (!strcmp(type, *av))
    434 			return (which == IN_LIST ? 1 : 0);
    435 	return (which == IN_LIST ? 0 : 1);
    436 }
    437 
    438 void
    439 maketypelist(fslist)
    440 	char *fslist;
    441 {
    442 	int i;
    443 	char *nextcp, **av;
    444 
    445 	if ((fslist == NULL) || (fslist[0] == '\0'))
    446 		errx(1, "empty type list");
    447 
    448 	/*
    449 	 * XXX
    450 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
    451 	 * no yyy's, not the more intuitive "noyyy,noyyy".
    452 	 */
    453 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    454 		fslist += 2;
    455 		which = NOT_IN_LIST;
    456 	} else
    457 		which = IN_LIST;
    458 
    459 	/* Count the number of types. */
    460 	for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++)
    461 		++nextcp;
    462 
    463 	/* Build an array of that many types. */
    464 	if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
    465 		err(1, NULL);
    466 	av[0] = fslist;
    467 	for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) {
    468 		*nextcp = '\0';
    469 		av[i] = ++nextcp;
    470 	}
    471 	/* Terminate the array. */
    472 	av[i] = 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, NULL);
    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 ufs | external_type]",
    530 			"special node",
    531 		"[-adfruvw] [-t ufs | external_type]",
    532 		"[-dfruvw] special | node");
    533 	exit(1);
    534 }
    535