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mount.c revision 1.1.1.2 
      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[] = "@(#)mount.c	8.19 (Berkeley) 4/19/94";
     42 #endif /* not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/mount.h>
     46 #include <sys/wait.h>
     47 
     48 #include <err.h>
     49 #include <errno.h>
     50 #include <fstab.h>
     51 #include <signal.h>
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 #include <unistd.h>
     56 
     57 #include "pathnames.h"
     58 
     59 int debug, verbose, skipvfs;
     60 
     61 int	badvfsname __P((const char *, const char **));
     62 int	badvfstype __P((int, const char **));
     63 char   *catopt __P((char *, const char *));
     64 struct statfs
     65        *getmntpt __P((const char *));
     66 const char
     67       **makevfslist __P((char *));
     68 void	mangle __P((char *, int *, const char **));
     69 int	mountfs __P((const char *, const char *, const char *,
     70 			int, const char *, const char *));
     71 void	prmount __P((const char *, const char *, int));
     72 void	usage __P((void));
     73 
     74 /* From mount_ufs.c. */
     75 int	mount_ufs __P((int, char * const *));
     76 
     77 /* Map from mount otions to printable formats. */
     78 static struct opt {
     79 	int o_opt;
     80 	const char *o_name;
     81 } optnames[] = {
     82 	{ MNT_ASYNC,		"asynchronous" },
     83 	{ MNT_EXPORTED,		"NFS exported" },
     84 	{ MNT_LOCAL,		"local" },
     85 	{ MNT_NODEV,		"nodev" },
     86 	{ MNT_NOEXEC,		"noexec" },
     87 	{ MNT_NOSUID,		"nosuid" },
     88 	{ MNT_QUOTA,		"with quotas" },
     89 	{ MNT_RDONLY,		"read-only" },
     90 	{ MNT_SYNCHRONOUS,	"synchronous" },
     91 	{ MNT_UNION,		"union" },
     92 	{ MNT_USER,		"user mount" },
     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 (mountfs(fs->fs_vfstype, fs->fs_spec,
    168 				    fs->fs_file, init_flags, options,
    169 				    fs->fs_mntops))
    170 					rval = 1;
    171 			}
    172 		else {
    173 			if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
    174 				err(1, "getmntinfo");
    175 			for (i = 0; i < mntsize; i++) {
    176 				if (badvfstype(mntbuf[i].f_type, vfslist))
    177 					continue;
    178 				prmount(mntbuf[i].f_mntfromname,
    179 				    mntbuf[i].f_mntonname, mntbuf[i].f_flags);
    180 			}
    181 		}
    182 		exit(rval);
    183 	case 1:
    184 		if (vfslist != 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 (vfslist == 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 mountfs(vfstype, spec, name, flags, options, mntopts)
    245 	const char *vfstype, *spec, *name, *options, *mntopts;
    246 	int flags;
    247 {
    248 	/* List of directories containing mount_xxx subcommands. */
    249 	static const char *edirs[] = {
    250 		_PATH_SBIN,
    251 		_PATH_USRSBIN,
    252 		NULL
    253 	};
    254 	const char *argv[100], **edir;
    255 	struct statfs sf;
    256 	pid_t pid;
    257 	int argc, i, status;
    258 	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
    259 
    260 	if (realpath(name, mntpath) == NULL) {
    261 		warn("%s", mntpath);
    262 		return (1);
    263 	}
    264 
    265 	name = mntpath;
    266 
    267 	if (options == NULL) {
    268 		if (mntopts == NULL || *mntopts == '\0')
    269 			options = "rw";
    270 		else
    271 			options = mntopts;
    272 		mntopts = "";
    273 	}
    274 	optbuf = catopt(strdup(mntopts), options);
    275 
    276 	if (strcmp(name, "/") == 0)
    277 		flags |= MNT_UPDATE;
    278 	if (flags & MNT_FORCE)
    279 		optbuf = catopt(optbuf, "force");
    280 	if (flags & MNT_RDONLY)
    281 		optbuf = catopt(optbuf, "ro");
    282 	/*
    283 	 * XXX
    284 	 * The mount_mfs (newfs) command uses -o to select the
    285 	 * optimisation mode.  We don't pass the default "-o rw"
    286 	 * for that reason.
    287 	 */
    288 	if (flags & MNT_UPDATE)
    289 		optbuf = catopt(optbuf, "update");
    290 
    291 	argc = 0;
    292 	argv[argc++] = vfstype;
    293 	mangle(optbuf, &argc, argv);
    294 	argv[argc++] = spec;
    295 	argv[argc++] = name;
    296 	argv[argc] = NULL;
    297 
    298 	if (debug) {
    299 		(void)printf("exec: mount_%s", vfstype);
    300 		for (i = 1; i < argc; i++)
    301 			(void)printf(" %s", argv[i]);
    302 		(void)printf("\n");
    303 		return (0);
    304 	}
    305 
    306 	switch (pid = vfork()) {
    307 	case -1:				/* Error. */
    308 		warn("vfork");
    309 		free(optbuf);
    310 		return (1);
    311 	case 0:					/* Child. */
    312 		if (strcmp(vfstype, "ufs") == 0)
    313 			exit(mount_ufs(argc, (char * const *) argv));
    314 
    315 		/* Go find an executable. */
    316 		edir = edirs;
    317 		do {
    318 			(void)snprintf(execname,
    319 			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
    320 			execv(execname, (char * const *)argv);
    321 			if (errno != ENOENT)
    322 				warn("exec %s for %s", execname, name);
    323 		} while (*++edir != NULL);
    324 
    325 		if (errno == ENOENT)
    326 			warn("exec %s for %s", execname, name);
    327 		exit(1);
    328 		/* NOTREACHED */
    329 	default:				/* Parent. */
    330 		free(optbuf);
    331 
    332 		if (waitpid(pid, &status, 0) < 0) {
    333 			warn("waitpid");
    334 			return (1);
    335 		}
    336 
    337 		if (WIFEXITED(status)) {
    338 			if (WEXITSTATUS(status) != 0)
    339 				return (WEXITSTATUS(status));
    340 		} else if (WIFSIGNALED(status)) {
    341 			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
    342 			return (1);
    343 		}
    344 
    345 		if (verbose) {
    346 			if (statfs(name, &sf) < 0) {
    347 				warn("%s", name);
    348 				return (1);
    349 			}
    350 			prmount(sf.f_mntfromname, sf.f_mntonname, sf.f_flags);
    351 		}
    352 		break;
    353 	}
    354 
    355 	return (0);
    356 }
    357 
    358 void
    359 prmount(spec, name, flags)
    360 	const char *spec, *name;
    361 	int flags;
    362 {
    363 	struct opt *o;
    364 	int f;
    365 
    366 	(void)printf("%s on %s", spec, name);
    367 
    368 	flags &= MNT_VISFLAGMASK;
    369 	for (f = 0, o = optnames; flags && o->o_opt; o++)
    370 		if (flags & o->o_opt) {
    371 			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
    372 			flags &= ~o->o_opt;
    373 		}
    374 	(void)printf(f ? ")\n" : "\n");
    375 }
    376 
    377 struct statfs *
    378 getmntpt(name)
    379 	const char *name;
    380 {
    381 	struct statfs *mntbuf;
    382 	int i, mntsize;
    383 
    384 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    385 	for (i = 0; i < mntsize; i++)
    386 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
    387 		    strcmp(mntbuf[i].f_mntonname, name) == 0)
    388 			return (&mntbuf[i]);
    389 	return (NULL);
    390 }
    391 
    392 int
    393 badvfsname(vfsname, vfslist)
    394 	const char *vfsname;
    395 	const char **vfslist;
    396 {
    397 
    398 	if (vfslist == NULL)
    399 		return (0);
    400 	while (*vfslist != NULL) {
    401 		if (strcmp(vfsname, *vfslist) == 0)
    402 			return (skipvfs);
    403 		++vfslist;
    404 	}
    405 	return (!skipvfs);
    406 }
    407 
    408 int
    409 badvfstype(vfstype, vfslist)
    410 	int vfstype;
    411 	const char **vfslist;
    412 {
    413 static const char *vfsnames[] = INITMOUNTNAMES;
    414 
    415 	if ((vfstype < 0) || (vfstype > MOUNT_MAXTYPE))
    416 		return (0);
    417 
    418 	return (badvfsname(vfsnames[vfstype], vfslist));
    419 }
    420 
    421 const char **
    422 makevfslist(fslist)
    423 	char *fslist;
    424 {
    425 	const char **av;
    426 	int i;
    427 	char *nextcp;
    428 
    429 	if (fslist == NULL)
    430 		return (NULL);
    431 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    432 		fslist += 2;
    433 		skipvfs = 1;
    434 	}
    435 	for (i = 0, nextcp = fslist; *nextcp; nextcp++)
    436 		if (*nextcp == ',')
    437 			i++;
    438 	if ((av = malloc((size_t)(i + 2) * sizeof(char *))) == NULL) {
    439 		warn(NULL);
    440 		return (NULL);
    441 	}
    442 	nextcp = fslist;
    443 	i = 0;
    444 	av[i++] = nextcp;
    445 	while ((nextcp = strchr(nextcp, ',')) != NULL) {
    446 		*nextcp++ = '\0';
    447 		av[i++] = nextcp;
    448 	}
    449 	av[i++] = NULL;
    450 	return (av);
    451 }
    452 
    453 char *
    454 catopt(s0, s1)
    455 	char *s0;
    456 	const char *s1;
    457 {
    458 	size_t i;
    459 	char *cp;
    460 
    461 	if (s0 && *s0) {
    462 		i = strlen(s0) + strlen(s1) + 1 + 1;
    463 		if ((cp = malloc(i)) == NULL)
    464 			err(1, NULL);
    465 		(void)snprintf(cp, i, "%s,%s", s0, s1);
    466 	} else
    467 		cp = strdup(s1);
    468 
    469 	if (s0)
    470 		free(s0);
    471 	return (cp);
    472 }
    473 
    474 void
    475 mangle(options, argcp, argv)
    476 	char *options;
    477 	int *argcp;
    478 	const char **argv;
    479 {
    480 	char *p, *s;
    481 	int argc;
    482 
    483 	argc = *argcp;
    484 	for (s = options; (p = strsep(&s, ",")) != NULL;)
    485 		if (*p != '\0')
    486 			if (*p == '-') {
    487 				argv[argc++] = p;
    488 				p = strchr(p, '=');
    489 				if (p) {
    490 					*p = '\0';
    491 					argv[argc++] = p+1;
    492 				}
    493 			} else if (strcmp(p, "rw") != 0) {
    494 				argv[argc++] = "-o";
    495 				argv[argc++] = p;
    496 			}
    497 
    498 	*argcp = argc;
    499 }
    500 
    501 void
    502 usage()
    503 {
    504 
    505 	(void)fprintf(stderr,
    506 		"usage: mount %s %s\n       mount %s\n       mount %s\n",
    507 		"[-dfruvw] [-o options] [-t ufs | external_type]",
    508 			"special node",
    509 		"[-adfruvw] [-t ufs | external_type]",
    510 		"[-dfruvw] special | node");
    511 	exit(1);
    512 }
    513