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mount.c revision 1.1.1.3 
      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	8.25 (Berkeley) 5/8/95";
     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 <pwd.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 
     62 int	checkvfsname __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 *mntfromname, **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 (checkvfsname(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 (checkvfsname(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 				mntfromname = fs->fs_spec;
    195 			else
    196 				mntfromname = mntbuf->f_mntfromname;
    197 			rval = mountfs(mntbuf->f_fstypename, mntfromname,
    198 			    mntbuf->f_mntonname, init_flags, options, 0);
    199 			break;
    200 		}
    201 		if ((fs = getfsfile(*argv)) == NULL &&
    202 		    (fs = getfsspec(*argv)) == NULL)
    203 			errx(1, "%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 		rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
    209 		    init_flags, options, fs->fs_mntops);
    210 		break;
    211 	case 2:
    212 		/*
    213 		 * If -t flag has not been specified, and spec contains either
    214 		 * a ':' or a '@' then assume that an NFS filesystem is being
    215 		 * specified ala Sun.
    216 		 */
    217 		if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL)
    218 			vfstype = "nfs";
    219 		rval = mountfs(vfstype,
    220 		    argv[0], argv[1], init_flags, options, NULL);
    221 		break;
    222 	default:
    223 		usage();
    224 		/* NOTREACHED */
    225 	}
    226 
    227 	/*
    228 	 * If the mount was successfully, and done by root, tell mountd the
    229 	 * good news.  Pid checks are probably unnecessary, but don't hurt.
    230 	 */
    231 	if (rval == 0 && getuid() == 0 &&
    232 	    (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
    233 		if (fscanf(mountdfp, "%ld", &pid) == 1 &&
    234 		     pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
    235 			err(1, "signal mountd");
    236 		(void)fclose(mountdfp);
    237 	}
    238 
    239 	exit(rval);
    240 }
    241 
    242 int
    243 hasopt(mntopts, option)
    244 	const char *mntopts, *option;
    245 {
    246 	int negative, found;
    247 	char *opt, *optbuf;
    248 
    249 	if (option[0] == 'n' && option[1] == 'o') {
    250 		negative = 1;
    251 		option += 2;
    252 	} else
    253 		negative = 0;
    254 	optbuf = strdup(mntopts);
    255 	found = 0;
    256 	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
    257 		if (opt[0] == 'n' && opt[1] == 'o') {
    258 			if (!strcasecmp(opt + 2, option))
    259 				found = negative;
    260 		} else if (!strcasecmp(opt, option))
    261 			found = !negative;
    262 	}
    263 	free(optbuf);
    264 	return (found);
    265 }
    266 
    267 int
    268 mountfs(vfstype, spec, name, flags, options, mntopts)
    269 	const char *vfstype, *spec, *name, *options, *mntopts;
    270 	int flags;
    271 {
    272 	/* List of directories containing mount_xxx subcommands. */
    273 	static const char *edirs[] = {
    274 		_PATH_SBIN,
    275 		_PATH_USRSBIN,
    276 		NULL
    277 	};
    278 	const char *argv[100], **edir;
    279 	struct statfs sf;
    280 	pid_t pid;
    281 	int argc, i, status;
    282 	char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
    283 
    284 	if (realpath(name, mntpath) == NULL) {
    285 		warn("realpath %s", mntpath);
    286 		return (1);
    287 	}
    288 
    289 	name = mntpath;
    290 
    291 	if (mntopts == NULL)
    292 		mntopts = "";
    293 	if (options == NULL) {
    294 		if (*mntopts == '\0') {
    295 			options = "rw";
    296 		} else {
    297 			options = mntopts;
    298 			mntopts = "";
    299 		}
    300 	}
    301 	optbuf = catopt(strdup(mntopts), options);
    302 
    303 	if (strcmp(name, "/") == 0)
    304 		flags |= MNT_UPDATE;
    305 	if (flags & MNT_FORCE)
    306 		optbuf = catopt(optbuf, "force");
    307 	if (flags & MNT_RDONLY)
    308 		optbuf = catopt(optbuf, "ro");
    309 	/*
    310 	 * XXX
    311 	 * The mount_mfs (newfs) command uses -o to select the
    312 	 * optimisation mode.  We don't pass the default "-o rw"
    313 	 * for that reason.
    314 	 */
    315 	if (flags & MNT_UPDATE)
    316 		optbuf = catopt(optbuf, "update");
    317 
    318 	argc = 0;
    319 	argv[argc++] = vfstype;
    320 	mangle(optbuf, &argc, argv);
    321 	argv[argc++] = spec;
    322 	argv[argc++] = name;
    323 	argv[argc] = NULL;
    324 
    325 	if (debug) {
    326 		(void)printf("exec: mount_%s", vfstype);
    327 		for (i = 1; i < argc; i++)
    328 			(void)printf(" %s", argv[i]);
    329 		(void)printf("\n");
    330 		return (0);
    331 	}
    332 
    333 	switch (pid = vfork()) {
    334 	case -1:				/* Error. */
    335 		warn("vfork");
    336 		free(optbuf);
    337 		return (1);
    338 	case 0:					/* Child. */
    339 		if (strcmp(vfstype, "ufs") == 0)
    340 			exit(mount_ufs(argc, (char * const *) argv));
    341 
    342 		/* Go find an executable. */
    343 		edir = edirs;
    344 		do {
    345 			(void)snprintf(execname,
    346 			    sizeof(execname), "%s/mount_%s", *edir, vfstype);
    347 			execv(execname, (char * const *)argv);
    348 			if (errno != ENOENT)
    349 				warn("exec %s for %s", execname, name);
    350 		} while (*++edir != NULL);
    351 
    352 		if (errno == ENOENT)
    353 			warn("exec %s for %s", execname, name);
    354 		exit(1);
    355 		/* NOTREACHED */
    356 	default:				/* Parent. */
    357 		free(optbuf);
    358 
    359 		if (waitpid(pid, &status, 0) < 0) {
    360 			warn("waitpid");
    361 			return (1);
    362 		}
    363 
    364 		if (WIFEXITED(status)) {
    365 			if (WEXITSTATUS(status) != 0)
    366 				return (WEXITSTATUS(status));
    367 		} else if (WIFSIGNALED(status)) {
    368 			warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
    369 			return (1);
    370 		}
    371 
    372 		if (verbose) {
    373 			if (statfs(name, &sf) < 0) {
    374 				warn("statfs %s", name);
    375 				return (1);
    376 			}
    377 			prmount(&sf);
    378 		}
    379 		break;
    380 	}
    381 
    382 	return (0);
    383 }
    384 
    385 void
    386 prmount(sfp)
    387 	struct statfs *sfp;
    388 {
    389 	int flags;
    390 	struct opt *o;
    391 	struct passwd *pw;
    392 	int f;
    393 
    394 	(void)printf("%s on %s", sfp->f_mntfromname, sfp->f_mntonname);
    395 
    396 	flags = sfp->f_flags & MNT_VISFLAGMASK;
    397 	for (f = 0, o = optnames; flags && o->o_opt; o++)
    398 		if (flags & o->o_opt) {
    399 			(void)printf("%s%s", !f++ ? " (" : ", ", o->o_name);
    400 			flags &= ~o->o_opt;
    401 		}
    402 	if (sfp->f_owner) {
    403 		(void)printf("%smounted by ", !f++ ? " (" : ", ");
    404 		if ((pw = getpwuid(sfp->f_owner)) != NULL)
    405 			(void)printf("%s", pw->pw_name);
    406 		else
    407 			(void)printf("%d", sfp->f_owner);
    408 	}
    409 	(void)printf(f ? ")\n" : "\n");
    410 }
    411 
    412 struct statfs *
    413 getmntpt(name)
    414 	const char *name;
    415 {
    416 	struct statfs *mntbuf;
    417 	int i, mntsize;
    418 
    419 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    420 	for (i = 0; i < mntsize; i++)
    421 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
    422 		    strcmp(mntbuf[i].f_mntonname, name) == 0)
    423 			return (&mntbuf[i]);
    424 	return (NULL);
    425 }
    426 
    427 char *
    428 catopt(s0, s1)
    429 	char *s0;
    430 	const char *s1;
    431 {
    432 	size_t i;
    433 	char *cp;
    434 
    435 	if (s0 && *s0) {
    436 		i = strlen(s0) + strlen(s1) + 1 + 1;
    437 		if ((cp = malloc(i)) == NULL)
    438 			err(1, NULL);
    439 		(void)snprintf(cp, i, "%s,%s", s0, s1);
    440 	} else
    441 		cp = strdup(s1);
    442 
    443 	if (s0)
    444 		free(s0);
    445 	return (cp);
    446 }
    447 
    448 void
    449 mangle(options, argcp, argv)
    450 	char *options;
    451 	int *argcp;
    452 	const char **argv;
    453 {
    454 	char *p, *s;
    455 	int argc;
    456 
    457 	argc = *argcp;
    458 	for (s = options; (p = strsep(&s, ",")) != NULL;)
    459 		if (*p != '\0')
    460 			if (*p == '-') {
    461 				argv[argc++] = p;
    462 				p = strchr(p, '=');
    463 				if (p) {
    464 					*p = '\0';
    465 					argv[argc++] = p+1;
    466 				}
    467 			} else if (strcmp(p, "rw") != 0) {
    468 				argv[argc++] = "-o";
    469 				argv[argc++] = p;
    470 			}
    471 
    472 	*argcp = argc;
    473 }
    474 
    475 void
    476 usage()
    477 {
    478 
    479 	(void)fprintf(stderr,
    480 		"usage: mount %s %s\n       mount %s\n       mount %s\n",
    481 		"[-dfruvw] [-o options] [-t ufs | external_type]",
    482 			"special node",
    483 		"[-adfruvw] [-t ufs | external_type]",
    484 		"[-dfruvw] special | node");
    485 	exit(1);
    486 }
    487