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mount.c revision 1.14 
      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 1.14 1994/12/18 16:03:02 cgd 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, skipvfs;
     61 
     62 int	badvfsname __P((const char *, const char **));
     63 char   *catopt __P((char *, const char *));
     64 struct statfs
     65        *getmntpt __P((const char *));
     66 int	hasopt __P((const char *, const char *));
     67 const char
     68       **makevfslist __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, **vfslist, *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 	vfslist = NULL;
    112 	vfstype = "ufs";
    113 	while ((ch = getopt(argc, argv, "adfo:rwt:uv")) != EOF)
    114 		switch (ch) {
    115 		case 'a':
    116 			all = 1;
    117 			break;
    118 		case 'd':
    119 			debug = 1;
    120 			break;
    121 		case 'f':
    122 			init_flags |= MNT_FORCE;
    123 			break;
    124 		case 'o':
    125 			if (*optarg)
    126 				options = catopt(options, optarg);
    127 			break;
    128 		case 'r':
    129 			init_flags |= MNT_RDONLY;
    130 			break;
    131 		case 't':
    132 			if (vfslist != NULL)
    133 				errx(1, "only one -t option may be specified.");
    134 			vfslist = makevfslist(optarg);
    135 			vfstype = optarg;
    136 			break;
    137 		case 'u':
    138 			init_flags |= MNT_UPDATE;
    139 			break;
    140 		case 'v':
    141 			verbose = 1;
    142 			break;
    143 		case 'w':
    144 			init_flags &= ~MNT_RDONLY;
    145 			break;
    146 		case '?':
    147 		default:
    148 			usage();
    149 			/* NOTREACHED */
    150 		}
    151 	argc -= optind;
    152 	argv += optind;
    153 
    154 #define	BADTYPE(type)							\
    155 	(strcmp(type, FSTAB_RO) &&					\
    156 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    157 
    158 	rval = 0;
    159 	switch (argc) {
    160 	case 0:
    161 		if (all)
    162 			while ((fs = getfsent()) != NULL) {
    163 				if (BADTYPE(fs->fs_type))
    164 					continue;
    165 				if (badvfsname(fs->fs_vfstype, vfslist))
    166 					continue;
    167 				if (hasopt(fs->fs_mntops, "noauto"))
    168 					continue;
    169 				if (mountfs(fs->fs_vfstype, fs->fs_spec,
    170 				    fs->fs_file, init_flags, options,
    171 				    fs->fs_mntops))
    172 					rval = 1;
    173 			}
    174 		else {
    175 			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
    176 				err(1, "getmntinfo");
    177 			for (i = 0; i < mntsize; i++) {
    178 				if (badvfsname(mntbuf[i].f_fstypename, vfslist))
    179 					continue;
    180 				prmount(&mntbuf[i]);
    181 			}
    182 		}
    183 		exit(rval);
    184 	case 1:
    185 		if (vfslist != NULL)
    186 			usage();
    187 
    188 		if (init_flags & MNT_UPDATE) {
    189 			if ((mntbuf = getmntpt(*argv)) == NULL)
    190 				errx(1,
    191 				    "unknown special file or file system %s.",
    192 				    *argv);
    193 			if ((fs = getfsfile(mntbuf->f_mntonname)) == NULL)
    194 				errx(1, "can't find fstab entry for %s.",
    195 				    *argv);
    196 			/* If it's an update, ignore the fstab file options. */
    197 			fs->fs_mntops = NULL;
    198 			mntonname = mntbuf->f_mntonname;
    199 		} else {
    200 			if ((fs = getfsfile(*argv)) == NULL &&
    201 			    (fs = getfsspec(*argv)) == NULL)
    202 				errx(1,
    203 				    "%s: unknown special file or file system.",
    204 				    *argv);
    205 			if (BADTYPE(fs->fs_type))
    206 				errx(1, "%s has unknown file system type.",
    207 				    *argv);
    208 			mntonname = fs->fs_file;
    209 		}
    210 		rval = mountfs(fs->fs_vfstype, fs->fs_spec,
    211 		    mntonname, init_flags, options, fs->fs_mntops);
    212 		break;
    213 	case 2:
    214 		/*
    215 		 * If -t flag has not been specified, and spec contains either
    216 		 * a ':' or a '@' then assume that an NFS filesystem is being
    217 		 * specified ala Sun.
    218 		 */
    219 		if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL)
    220 			vfstype = "nfs";
    221 		rval = mountfs(vfstype,
    222 		    argv[0], argv[1], init_flags, options, NULL);
    223 		break;
    224 	default:
    225 		usage();
    226 		/* NOTREACHED */
    227 	}
    228 
    229 	/*
    230 	 * If the mount was successfully, and done by root, tell mountd the
    231 	 * good news.  Pid checks are probably unnecessary, but don't hurt.
    232 	 */
    233 	if (rval == 0 && getuid() == 0 &&
    234 	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
    235 		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
    236 		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
    237 			err(1, "signal mountd");
    238 		(void)fclose(mountdfp);
    239 	}
    240 
    241 	exit(rval);
    242 }
    243 
    244 int
    245 hasopt(mntopts, option)
    246 	const char *mntopts, *option;
    247 {
    248 	int negative, found;
    249 	char *opt, *optbuf;
    250 
    251 	if (option[0] == 'n' && option[1] == 'o') {
    252 		negative = 1;
    253 		option += 2;
    254 	} else
    255 		negative = 0;
    256 	optbuf = strdup(mntopts);
    257 	found = 0;
    258 	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
    259 		if (opt[0] == 'n' && opt[1] == 'o') {
    260 			if (!strcasecmp(opt + 2, option))
    261 				found = negative;
    262 		} else if (!strcasecmp(opt, option))
    263 			found = !negative;
    264 	}
    265 	free(optbuf);
    266 	return (found);
    267 }
    268 
    269 int
    270 mountfs(vfstype, spec, name, flags, options, mntopts)
    271 	const char *vfstype, *spec, *name, *options, *mntopts;
    272 	int flags;
    273 {
    274 	/* List of directories containing mount_xxx subcommands. */
    275 	static const char *edirs[] = {
    276 		_PATH_SBIN,
    277 		_PATH_USRSBIN,
    278 		NULL
    279 	};
    280 	const char *argv[100], **edir;
    281 	struct statfs sf;
    282 	pid_t pid;
    283 	int argc, i, status;
    284 	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
    285 
    286 	if (realpath(name, mntpath) == NULL) {
    287 		warn("realpath %s", mntpath);
    288 		return (1);
    289 	}
    290 
    291 	name = mntpath;
    292 
    293 	if (mntopts == NULL)
    294 		mntopts = "";
    295 	if (options == NULL) {
    296 		if (*mntopts == '\0')
    297 			options = "rw";
    298 		else {
    299 			options = mntopts;
    300 			mntopts = "";
    301 		}
    302 	}
    303 	optbuf = catopt(strdup(mntopts), options);
    304 
    305 	if (strcmp(name, "/") == 0)
    306 		flags |= MNT_UPDATE;
    307 	if (flags & MNT_FORCE)
    308 		optbuf = catopt(optbuf, "force");
    309 	if (flags & MNT_RDONLY)
    310 		optbuf = catopt(optbuf, "ro");
    311 	/*
    312 	 * XXX
    313 	 * The mount_mfs (newfs) command uses -o to select the
    314 	 * optimisation mode.  We don't pass the default "-o rw"
    315 	 * for that reason.
    316 	 */
    317 	if (flags & MNT_UPDATE)
    318 		optbuf = catopt(optbuf, "update");
    319 
    320 	argc = 0;
    321 	argv[argc++] = vfstype;
    322 	mangle(optbuf, &argc, argv);
    323 	argv[argc++] = spec;
    324 	argv[argc++] = name;
    325 	argv[argc] = NULL;
    326 
    327 	if (debug) {
    328 		(void)printf("exec: mount_%s", vfstype);
    329 		for (i = 1; i < argc; i++)
    330 			(void)printf(" %s", argv[i]);
    331 		(void)printf("\n");
    332 		return (0);
    333 	}
    334 
    335 	switch (pid = vfork()) {
    336 	case -1:				/* Error. */
    337 		warn("vfork");
    338 		free(optbuf);
    339 		return (1);
    340 	case 0:					/* Child. */
    341 		if (strcmp(vfstype, "ufs") == 0)
    342 			exit(mount_ufs(argc, (char * const *) argv));
    343 
    344 		/* Go find an executable. */
    345 		edir = edirs;
    346 		do {
    347 			(void)snprintf(execname,
    348 			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
    349 			execv(execname, (char * const *)argv);
    350 			if (errno != ENOENT)
    351 				warn("exec %s for %s", execname, name);
    352 		} while (*++edir != NULL);
    353 
    354 		if (errno == ENOENT)
    355 			warn("exec %s for %s", execname, name);
    356 		exit(1);
    357 		/* NOTREACHED */
    358 	default:				/* Parent. */
    359 		free(optbuf);
    360 
    361 		if (waitpid(pid, &status, 0) < 0) {
    362 			warn("waitpid");
    363 			return (1);
    364 		}
    365 
    366 		if (WIFEXITED(status)) {
    367 			if (WEXITSTATUS(status) != 0)
    368 				return (WEXITSTATUS(status));
    369 		} else if (WIFSIGNALED(status)) {
    370 			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
    371 			return (1);
    372 		}
    373 
    374 		if (verbose) {
    375 			if (statfs(name, &sf) < 0) {
    376 				warn("statfs %s", name);
    377 				return (1);
    378 			}
    379 			prmount(&sf);
    380 		}
    381 		break;
    382 	}
    383 
    384 	return (0);
    385 }
    386 
    387 void
    388 prmount(sf)
    389 	struct statfs *sf;
    390 {
    391 	int flags;
    392 	struct opt *o;
    393 	int f;
    394 
    395 	(void)printf("%s on %s type %s", sf->f_mntfromname, sf->f_mntonname,
    396 	    sf->f_fstypename);
    397 
    398 	flags = sf->f_flags & MNT_VISFLAGMASK;
    399 	for (f = 0, o = optnames; flags && o->o_opt; o++)
    400 		if (flags & o->o_opt) {
    401 			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
    402 			flags &= ~o->o_opt;
    403 		}
    404 	(void)printf(f ? ")\n" : "\n");
    405 }
    406 
    407 struct statfs *
    408 getmntpt(name)
    409 	const char *name;
    410 {
    411 	struct statfs *mntbuf;
    412 	int i, mntsize;
    413 
    414 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    415 	for (i = 0; i < mntsize; i++)
    416 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
    417 		    strcmp(mntbuf[i].f_mntonname, name) == 0)
    418 			return (&mntbuf[i]);
    419 	return (NULL);
    420 }
    421 
    422 int
    423 badvfsname(vfsname, vfslist)
    424 	const char *vfsname;
    425 	const char **vfslist;
    426 {
    427 
    428 	if (vfslist == NULL)
    429 		return (0);
    430 	while (*vfslist != NULL) {
    431 		if (strcmp(vfsname, *vfslist) == 0)
    432 			return (skipvfs);
    433 		++vfslist;
    434 	}
    435 	return (!skipvfs);
    436 }
    437 
    438 const char **
    439 makevfslist(fslist)
    440 	char *fslist;
    441 {
    442 	const char **av;
    443 	int i;
    444 	char *nextcp;
    445 
    446 	if (fslist == NULL)
    447 		return (NULL);
    448 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    449 		fslist += 2;
    450 		skipvfs = 1;
    451 	}
    452 	for (i = 0, nextcp = fslist; *nextcp; nextcp++)
    453 		if (*nextcp == ',')
    454 			i++;
    455 	if ((av = malloc((size_t)(i + 2) * sizeof(char *))) == NULL) {
    456 		warn(NULL);
    457 		return (NULL);
    458 	}
    459 	nextcp = fslist;
    460 	i = 0;
    461 	av[i++] = nextcp;
    462 	while ((nextcp = strchr(nextcp, ',')) != NULL) {
    463 		*nextcp++ = '\0';
    464 		av[i++] = nextcp;
    465 	}
    466 	av[i++] = NULL;
    467 	return (av);
    468 }
    469 
    470 char *
    471 catopt(s0, s1)
    472 	char *s0;
    473 	const char *s1;
    474 {
    475 	size_t i;
    476 	char *cp;
    477 
    478 	if (s0 && *s0) {
    479 		i = strlen(s0) + strlen(s1) + 1 + 1;
    480 		if ((cp = malloc(i)) == NULL)
    481 			err(1, NULL);
    482 		(void)snprintf(cp, i, "%s,%s", s0, s1);
    483 	} else
    484 		cp = strdup(s1);
    485 
    486 	if (s0)
    487 		free(s0);
    488 	return (cp);
    489 }
    490 
    491 void
    492 mangle(options, argcp, argv)
    493 	char *options;
    494 	int *argcp;
    495 	const char **argv;
    496 {
    497 	char *p, *s;
    498 	int argc;
    499 
    500 	argc = *argcp;
    501 	for (s = options; (p = strsep(&s, ",")) != NULL;)
    502 		if (*p != '\0')
    503 			if (*p == '-') {
    504 				argv[argc++] = p;
    505 				p = strchr(p, '=');
    506 				if (p) {
    507 					*p = '\0';
    508 					argv[argc++] = p+1;
    509 				}
    510 			} else if (strcmp(p, "rw") != 0) {
    511 				argv[argc++] = "-o";
    512 				argv[argc++] = p;
    513 			}
    514 
    515 	*argcp = argc;
    516 }
    517 
    518 void
    519 usage()
    520 {
    521 
    522 	(void)fprintf(stderr,
    523 		"usage: mount %s %s\n       mount %s\n       mount %s\n",
    524 		"[-dfruvw] [-o options] [-t ufs | external_type]",
    525 			"special node",
    526 		"[-adfruvw] [-t ufs | external_type]",
    527 		"[-dfruvw] special | node");
    528 	exit(1);
    529 }
    530