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mount.c revision 1.21 
      1 /*	$NetBSD: mount.c,v 1.21 1995/07/12 03:45:14 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 1.21 1995/07/12 03:45:14 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 *));
     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, i, init_flags, mntsize, rval;
    109 	char *options;
    110 
    111 	all = init_flags = 0;
    112 	options = NULL;
    113 	vfstype = "ufs";
    114 	while ((ch = getopt(argc, argv, "adfo:rwt:uv")) != EOF)
    115 		switch (ch) {
    116 		case 'a':
    117 			all = 1;
    118 			break;
    119 		case 'd':
    120 			debug = 1;
    121 			break;
    122 		case 'f':
    123 			init_flags |= MNT_FORCE;
    124 			break;
    125 		case 'o':
    126 			if (*optarg)
    127 				options = catopt(options, optarg);
    128 			break;
    129 		case 'r':
    130 			init_flags |= MNT_RDONLY;
    131 			break;
    132 		case 't':
    133 			if (typelist != NULL)
    134 				errx(1, "only one -t option may be specified.");
    135 			maketypelist(optarg);
    136 			vfstype = optarg;
    137 			break;
    138 		case 'u':
    139 			init_flags |= MNT_UPDATE;
    140 			break;
    141 		case 'v':
    142 			verbose = 1;
    143 			break;
    144 		case 'w':
    145 			init_flags &= ~MNT_RDONLY;
    146 			break;
    147 		case '?':
    148 		default:
    149 			usage();
    150 			/* NOTREACHED */
    151 		}
    152 	argc -= optind;
    153 	argv += optind;
    154 
    155 #define	BADTYPE(type)							\
    156 	(strcmp(type, FSTAB_RO) &&					\
    157 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    158 
    159 	rval = 0;
    160 	switch (argc) {
    161 	case 0:
    162 		if (all)
    163 			while ((fs = getfsent()) != NULL) {
    164 				if (BADTYPE(fs->fs_type))
    165 					continue;
    166 				if (!selected(fs->fs_vfstype))
    167 					continue;
    168 				if (hasopt(fs->fs_mntops, "noauto"))
    169 					continue;
    170 				if (mountfs(fs->fs_vfstype, fs->fs_spec,
    171 				    fs->fs_file, init_flags, options,
    172 				    fs->fs_mntops))
    173 					rval = 1;
    174 			}
    175 		else {
    176 			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
    177 				err(1, "getmntinfo");
    178 			for (i = 0; i < mntsize; i++) {
    179 				if (!selected(mntbuf[i].f_fstypename))
    180 					continue;
    181 				prmount(&mntbuf[i]);
    182 			}
    183 		}
    184 		exit(rval);
    185 	case 1:
    186 		if (typelist != NULL)
    187 			usage();
    188 
    189 		if (init_flags & MNT_UPDATE) {
    190 			if ((mntbuf = getmntpt(*argv)) == NULL)
    191 				errx(1,
    192 				    "unknown special file or file system %s.",
    193 				    *argv);
    194 			if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL)
    195 				errx(1, "can't find fstab entry for %s.",
    196 				    *argv);
    197 			/* If it's an update, ignore the fstab file options. */
    198 			fs->fs_mntops = NULL;
    199 			mntonname = mntbuf->f_mntonname;
    200 		} else {
    201 			if ((fs = getfsfile(*argv)) == NULL &&
    202 			    (fs = getfsspec(*argv)) == NULL)
    203 				errx(1,
    204 				    "%s: unknown special file or file system.",
    205 				    *argv);
    206 			if (BADTYPE(fs->fs_type))
    207 				errx(1, "%s has unknown file system type.",
    208 				    *argv);
    209 			mntonname = fs->fs_file;
    210 		}
    211 		rval = mountfs(fs->fs_vfstype, fs->fs_spec,
    212 		    mntonname, init_flags, options, fs->fs_mntops);
    213 		break;
    214 	case 2:
    215 		/*
    216 		 * If -t flag has not been specified, and spec contains either
    217 		 * a ':' or a '@' then assume that an NFS filesystem is being
    218 		 * specified ala Sun.
    219 		 */
    220 		if (typelist == NULL && strpbrk(argv[0], ":@") != NULL)
    221 			vfstype = "nfs";
    222 		rval = mountfs(vfstype,
    223 		    argv[0], argv[1], init_flags, options, NULL);
    224 		break;
    225 	default:
    226 		usage();
    227 		/* NOTREACHED */
    228 	}
    229 
    230 	/*
    231 	 * If the mount was successfully, and done by root, tell mountd the
    232 	 * good news.  Pid checks are probably unnecessary, but don't hurt.
    233 	 */
    234 	if (rval == 0 && getuid() == 0 &&
    235 	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
    236 		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
    237 		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
    238 			err(1, "signal mountd");
    239 		(void)fclose(mountdfp);
    240 	}
    241 
    242 	exit(rval);
    243 }
    244 
    245 int
    246 hasopt(mntopts, option)
    247 	const char *mntopts, *option;
    248 {
    249 	int negative, found;
    250 	char *opt, *optbuf;
    251 
    252 	if (option[0] == 'n' && option[1] == 'o') {
    253 		negative = 1;
    254 		option += 2;
    255 	} else
    256 		negative = 0;
    257 	optbuf = strdup(mntopts);
    258 	found = 0;
    259 	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
    260 		if (opt[0] == 'n' && opt[1] == 'o') {
    261 			if (!strcasecmp(opt + 2, option))
    262 				found = negative;
    263 		} else if (!strcasecmp(opt, option))
    264 			found = !negative;
    265 	}
    266 	free(optbuf);
    267 	return (found);
    268 }
    269 
    270 int
    271 mountfs(vfstype, spec, name, flags, options, mntopts)
    272 	const char *vfstype, *spec, *name, *options, *mntopts;
    273 	int flags;
    274 {
    275 	/* List of directories containing mount_xxx subcommands. */
    276 	static const char *edirs[] = {
    277 		_PATH_SBIN,
    278 		_PATH_USRSBIN,
    279 		NULL
    280 	};
    281 	const char *argv[100], **edir;
    282 	struct statfs sf;
    283 	pid_t pid;
    284 	int argc, i, status;
    285 	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
    286 
    287 	if (realpath(name, mntpath) == NULL) {
    288 		warn("realpath %s", name);
    289 		return (1);
    290 	}
    291 
    292 	name = mntpath;
    293 
    294 	if (mntopts == NULL)
    295 		mntopts = "";
    296 	if (options == NULL) {
    297 		if (*mntopts == '\0')
    298 			options = "rw";
    299 		else {
    300 			options = mntopts;
    301 			mntopts = "";
    302 		}
    303 	}
    304 	optbuf = catopt(strdup(mntopts), options);
    305 
    306 	if (strcmp(name, "/") == 0)
    307 		flags |= MNT_UPDATE;
    308 	else {
    309 		if (statfs(name, &sf) < 0) {
    310 			warn("statfs %s", name);
    311 			return (1);
    312 		}
    313 		/* XXX can't check f_mntfromname, thanks to mfs, union, etc. */
    314 		if (strncmp(name, sf.f_mntonname, MNAMELEN) == 0 &&
    315 		    strncmp(vfstype, sf.f_fstypename, MFSNAMELEN) == 0) {
    316 			if (verbose)
    317 				(void)printf("%s on %s type %.*s: %s\n",
    318 				    sf.f_mntfromname, sf.f_mntonname,
    319 			            MFSNAMELEN, sf.f_fstypename,
    320 				    "already mounted");
    321 			return (0);
    322 		}
    323 	}
    324 	if (flags & MNT_FORCE)
    325 		optbuf = catopt(optbuf, "force");
    326 	if (flags & MNT_RDONLY)
    327 		optbuf = catopt(optbuf, "ro");
    328 	/*
    329 	 * XXX
    330 	 * The mount_mfs (newfs) command uses -o to select the
    331 	 * optimisation mode.  We don't pass the default "-o rw"
    332 	 * for that reason.
    333 	 */
    334 	if (flags & MNT_UPDATE)
    335 		optbuf = catopt(optbuf, "update");
    336 
    337 	argc = 0;
    338 	argv[argc++] = vfstype;
    339 	mangle(optbuf, &argc, argv);
    340 	argv[argc++] = spec;
    341 	argv[argc++] = name;
    342 	argv[argc] = NULL;
    343 
    344 	if (debug) {
    345 		(void)printf("exec: mount_%s", vfstype);
    346 		for (i = 1; i < argc; i++)
    347 			(void)printf(" %s", argv[i]);
    348 		(void)printf("\n");
    349 		return (0);
    350 	}
    351 
    352 	switch (pid = vfork()) {
    353 	case -1:				/* Error. */
    354 		warn("vfork");
    355 		free(optbuf);
    356 		return (1);
    357 	case 0:					/* Child. */
    358 		/* Go find an executable. */
    359 		edir = edirs;
    360 		do {
    361 			(void)snprintf(execname,
    362 			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
    363 			execv(execname, (char * const *)argv);
    364 			if (errno != ENOENT)
    365 				warn("exec %s for %s", execname, name);
    366 		} while (*++edir != NULL);
    367 
    368 		if (errno == ENOENT)
    369 			warn("exec %s for %s", execname, name);
    370 		exit(1);
    371 		/* NOTREACHED */
    372 	default:				/* Parent. */
    373 		free(optbuf);
    374 
    375 		if (waitpid(pid, &status, 0) < 0) {
    376 			warn("waitpid");
    377 			return (1);
    378 		}
    379 
    380 		if (WIFEXITED(status)) {
    381 			if (WEXITSTATUS(status) != 0)
    382 				return (WEXITSTATUS(status));
    383 		} else if (WIFSIGNALED(status)) {
    384 			warnx("%s: %s", name, strsignal(WTERMSIG(status)));
    385 			return (1);
    386 		}
    387 
    388 		if (verbose) {
    389 			if (statfs(name, &sf) < 0) {
    390 				warn("statfs %s", name);
    391 				return (1);
    392 			}
    393 			prmount(&sf);
    394 		}
    395 		break;
    396 	}
    397 
    398 	return (0);
    399 }
    400 
    401 void
    402 prmount(sf)
    403 	struct statfs *sf;
    404 {
    405 	int flags;
    406 	struct opt *o;
    407 	int f;
    408 
    409 	(void)printf("%s on %s type %.*s", sf->f_mntfromname, sf->f_mntonname,
    410 	    MFSNAMELEN, sf->f_fstypename);
    411 
    412 	flags = sf->f_flags & MNT_VISFLAGMASK;
    413 	for (f = 0, o = optnames; flags && o->o_opt; o++)
    414 		if (flags & o->o_opt) {
    415 			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
    416 			flags &= ~o->o_opt;
    417 		}
    418 	(void)printf(f ? ")\n" : "\n");
    419 }
    420 
    421 struct statfs *
    422 getmntpt(name)
    423 	const char *name;
    424 {
    425 	struct statfs *mntbuf;
    426 	int i, mntsize;
    427 
    428 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    429 	for (i = 0; i < mntsize; i++)
    430 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
    431 		    strcmp(mntbuf[i].f_mntonname, name) == 0)
    432 			return (&mntbuf[i]);
    433 	return (NULL);
    434 }
    435 
    436 static enum { IN_LIST, NOT_IN_LIST } which;
    437 
    438 int
    439 selected(type)
    440 	const char *type;
    441 {
    442 	char **av;
    443 
    444 	/* If no type specified, it's always selected. */
    445 	if (typelist == NULL)
    446 		return (1);
    447 	for (av = typelist; *av != NULL; ++av)
    448 		if (!strncmp(type, *av, MFSNAMELEN))
    449 			return (which == IN_LIST ? 1 : 0);
    450 	return (which == IN_LIST ? 0 : 1);
    451 }
    452 
    453 void
    454 maketypelist(fslist)
    455 	char *fslist;
    456 {
    457 	int i;
    458 	char *nextcp, **av;
    459 
    460 	if ((fslist == NULL) || (fslist[0] == '\0'))
    461 		errx(1, "empty type list");
    462 
    463 	/*
    464 	 * XXX
    465 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
    466 	 * no yyy's, not the more intuitive "noyyy,noyyy".
    467 	 */
    468 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    469 		fslist += 2;
    470 		which = NOT_IN_LIST;
    471 	} else
    472 		which = IN_LIST;
    473 
    474 	/* Count the number of types. */
    475 	for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++)
    476 		++nextcp;
    477 
    478 	/* Build an array of that many types. */
    479 	if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
    480 		err(1, NULL);
    481 	av[0] = fslist;
    482 	for (i = 1, nextcp = fslist; nextcp = strchr(nextcp, ','); i++) {
    483 		*nextcp = '\0';
    484 		av[i] = ++nextcp;
    485 	}
    486 	/* Terminate the array. */
    487 	av[i] = NULL;
    488 }
    489 
    490 char *
    491 catopt(s0, s1)
    492 	char *s0;
    493 	const char *s1;
    494 {
    495 	size_t i;
    496 	char *cp;
    497 
    498 	if (s0 && *s0) {
    499 		i = strlen(s0) + strlen(s1) + 1 + 1;
    500 		if ((cp = malloc(i)) == NULL)
    501 			err(1, NULL);
    502 		(void)snprintf(cp, i, "%s,%s", s0, s1);
    503 	} else
    504 		cp = strdup(s1);
    505 
    506 	if (s0)
    507 		free(s0);
    508 	return (cp);
    509 }
    510 
    511 void
    512 mangle(options, argcp, argv)
    513 	char *options;
    514 	int *argcp;
    515 	const char **argv;
    516 {
    517 	char *p, *s;
    518 	int argc;
    519 
    520 	argc = *argcp;
    521 	for (s = options; (p = strsep(&s, ",")) != NULL;)
    522 		if (*p != '\0')
    523 			if (*p == '-') {
    524 				argv[argc++] = p;
    525 				p = strchr(p, '=');
    526 				if (p) {
    527 					*p = '\0';
    528 					argv[argc++] = p+1;
    529 				}
    530 			} else if (strcmp(p, "rw") != 0) {
    531 				argv[argc++] = "-o";
    532 				argv[argc++] = p;
    533 			}
    534 
    535 	*argcp = argc;
    536 }
    537 
    538 void
    539 usage()
    540 {
    541 
    542 	(void)fprintf(stderr,
    543 		"usage: mount %s %s\n       mount %s\n       mount %s\n",
    544 		"[-dfruvw] [-o options] [-t ufs | external_type]",
    545 			"special node",
    546 		"[-adfruvw] [-t ufs | external_type]",
    547 		"[-dfruvw] special | node");
    548 	exit(1);
    549 }
    550