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umount.c revision 1.8 
      1 /*-
      2  * Copyright (c) 1980, 1989, 1993
      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\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: @(#)umount.c	8.3 (Berkeley) 2/20/94";*/
     42 static char *rcsid = "$Id: umount.c,v 1.8 1994/08/23 20:57:04 cgd Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 #include <sys/mount.h>
     48 #include <sys/time.h>
     49 #include <sys/socket.h>
     50 #include <sys/socketvar.h>
     51 
     52 #include <netdb.h>
     53 #include <rpc/rpc.h>
     54 #include <rpc/pmap_clnt.h>
     55 #include <rpc/pmap_prot.h>
     56 #include <nfs/rpcv2.h>
     57 
     58 #include <err.h>
     59 #include <fstab.h>
     60 #include <stdio.h>
     61 #include <stdlib.h>
     62 #include <string.h>
     63 #include <unistd.h>
     64 
     65 typedef enum { MNTON, MNTFROM } mntwhat;
     66 
     67 int	fake, fflag, vflag;
     68 char	**typelist;
     69 char	*nfshost;
     70 
     71 char	*getmntname __P((char *, mntwhat, char *));
     72 void	 maketypelist __P((char *));
     73 int	 selected __P((char *));
     74 int	 namematch __P((struct hostent *));
     75 int	 umountall __P((void));
     76 int	 umountfs __P((char *));
     77 void	 usage __P((void));
     78 int	 xdr_dir __P((XDR *, char *));
     79 
     80 int
     81 main(argc, argv)
     82 	int argc;
     83 	char *argv[];
     84 {
     85 	int all, ch, errs;
     86 
     87 	/* Start disks transferring immediately. */
     88 	sync();
     89 
     90 	all = 0;
     91 	while ((ch = getopt(argc, argv, "aFfh:t:v")) != EOF)
     92 		switch (ch) {
     93 		case 'a':
     94 			all = 1;
     95 			break;
     96 		case 'F':
     97 			fake = 1;
     98 			break;
     99 		case 'f':
    100 			fflag = MNT_FORCE;
    101 			break;
    102 		case 'h':	/* -h implies -a. */
    103 			all = 1;
    104 			nfshost = optarg;
    105 			break;
    106 		case 't':
    107 			maketypelist(optarg);
    108 			break;
    109 		case 'v':
    110 			vflag = 1;
    111 			break;
    112 		default:
    113 			usage();
    114 			/* NOTREACHED */
    115 		}
    116 	argc -= optind;
    117 	argv += optind;
    118 
    119 	if (argc == 0 && !all || argc != 0 && all)
    120 		usage();
    121 
    122 	/* -h implies "-t nfs" if no -t flag. */
    123 	if ((nfshost != NULL) && (typelist == NULL))
    124 		maketypelist("nfs");
    125 
    126 	if (all) {
    127 		if (setfsent() == 0)
    128 			err(1, "%s", _PATH_FSTAB);
    129 		errs = umountall();
    130 	} else
    131 		for (errs = 0; *argv != NULL; ++argv)
    132 			if (umountfs(*argv) != 0)
    133 				errs = 1;
    134 	exit(errs);
    135 }
    136 
    137 int
    138 umountall()
    139 {
    140 	struct fstab *fs;
    141 	int rval;
    142 	char *cp;
    143 
    144 	while ((fs = getfsent()) != NULL) {
    145 		/* Ignore the root. */
    146 		if (strcmp(fs->fs_file, "/") == 0)
    147 			continue;
    148 		/*
    149 		 * !!!
    150 		 * Historic practice: ignore unknown FSTAB_* fields.
    151 		 */
    152 		if (strcmp(fs->fs_type, FSTAB_RW) &&
    153 		    strcmp(fs->fs_type, FSTAB_RO) &&
    154 		    strcmp(fs->fs_type, FSTAB_RQ))
    155 			continue;
    156 
    157 		if (!selected(fs->fs_vfstype))
    158 			continue;
    159 
    160 		/*
    161 		 * We want to unmount the file systems in the reverse order
    162 		 * that they were mounted.  So, we save off the file name
    163 		 * in some allocated memory, and then call recursively.
    164 		 */
    165 		if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
    166 			err(1, NULL);
    167 		(void)strcpy(cp, fs->fs_file);
    168 		rval = umountall();
    169 		return (umountfs(cp) || rval);
    170 	}
    171 	return (0);
    172 }
    173 
    174 int
    175 umountfs(name)
    176 	char *name;
    177 {
    178 	enum clnt_stat clnt_stat;
    179 	struct hostent *hp;
    180 	struct sockaddr_in saddr;
    181 	struct stat sb;
    182 	struct timeval pertry, try;
    183 	CLIENT *clp;
    184 	int so;
    185 	char *delimp, *hostp, *mntpt, rname[MAXPATHLEN], type[MFSNAMELEN];
    186 
    187 	if (realpath(name, rname) == NULL) {
    188 		warn("%s", rname);
    189 		return (0);
    190 	}
    191 
    192 	name = rname;
    193 
    194 	if (stat(name, &sb) < 0) {
    195 		if (((mntpt = getmntname(name, MNTFROM, type)) == NULL) &&
    196 		    ((mntpt = getmntname(name, MNTON, type)) == NULL)) {
    197 			warnx("%s: not currently mounted", name);
    198 			return (1);
    199 		}
    200 	} else if (S_ISBLK(sb.st_mode)) {
    201 		if ((mntpt = getmntname(name, MNTON, type)) == NULL) {
    202 			warnx("%s: not currently mounted", name);
    203 			return (1);
    204 		}
    205 	} else if (S_ISDIR(sb.st_mode)) {
    206 		mntpt = name;
    207 		if ((name = getmntname(mntpt, MNTFROM, type)) == NULL) {
    208 			warnx("%s: not currently mounted", mntpt);
    209 			return (1);
    210 		}
    211 	} else {
    212 		warnx("%s: not a directory or special device", name);
    213 		return (1);
    214 	}
    215 
    216 	if (!selected(type))
    217 		return (0);
    218 
    219 	if ((delimp = strchr(name, '@')) != NULL) {
    220 		hostp = delimp + 1;
    221 		*delimp = '\0';
    222 		hp = gethostbyname(hostp);
    223 		*delimp = '@';
    224 	} else if ((delimp = strchr(name, ':')) != NULL) {
    225 		*delimp = '\0';
    226 		hostp = name;
    227 		hp = gethostbyname(hostp);
    228 		name = delimp + 1;
    229 		*delimp = ':';
    230 	} else
    231 		hp = NULL;
    232 	if (!namematch(hp))
    233 		return (0);
    234 
    235 	if (vflag)
    236 		(void)printf("%s: unmount from %s\n", name, mntpt);
    237 	if (fake)
    238 		return (0);
    239 
    240 	if (unmount(mntpt, fflag) < 0) {
    241 		warn("%s", mntpt);
    242 		return (1);
    243 	}
    244 
    245 	if ((hp != NULL) && !(fflag & MNT_FORCE)) {
    246 		*delimp = '\0';
    247 		memset(&saddr, 0, sizeof(saddr));
    248 		saddr.sin_family = AF_INET;
    249 		saddr.sin_port = 0;
    250 		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
    251 		pertry.tv_sec = 3;
    252 		pertry.tv_usec = 0;
    253 		so = RPC_ANYSOCK;
    254 		if ((clp = clntudp_create(&saddr,
    255 		    RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
    256 			clnt_pcreateerror("Cannot MNT PRC");
    257 			return (1);
    258 		}
    259 		clp->cl_auth = authunix_create_default();
    260 		try.tv_sec = 20;
    261 		try.tv_usec = 0;
    262 		clnt_stat = clnt_call(clp,
    263 		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
    264 		if (clnt_stat != RPC_SUCCESS) {
    265 			clnt_perror(clp, "Bad MNT RPC");
    266 			return (1);
    267 		}
    268 		auth_destroy(clp->cl_auth);
    269 		clnt_destroy(clp);
    270 	}
    271 	return (0);
    272 }
    273 
    274 char *
    275 getmntname(name, what, type)
    276 	char *name;
    277 	mntwhat what;
    278 	char *type;
    279 {
    280 	struct statfs *mntbuf;
    281 	int i, mntsize;
    282 
    283 	if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    284 		warn("getmntinfo");
    285 		return (NULL);
    286 	}
    287 	for (i = 0; i < mntsize; i++) {
    288 		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
    289 			if (type)
    290 				memcpy(type, mntbuf[i].f_fstypename,
    291 				    sizeof(mntbuf[i].f_fstypename));
    292 			return (mntbuf[i].f_mntonname);
    293 		}
    294 		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
    295 			if (type)
    296 				memcpy(type, mntbuf[i].f_fstypename,
    297 				    sizeof(mntbuf[i].f_fstypename));
    298 			return (mntbuf[i].f_mntfromname);
    299 		}
    300 	}
    301 	return (NULL);
    302 }
    303 
    304 static enum { IN_LIST, NOT_IN_LIST } which;
    305 
    306 int
    307 selected(type)
    308 	char *type;
    309 {
    310 	char **av;
    311 
    312 	/* If no type specified, it's always selected. */
    313 	if (typelist == NULL)
    314 		return (1);
    315 	for (av = typelist; *av != NULL; ++av)
    316 		if (!strcmp(type, *av))
    317 			return (which == IN_LIST ? 1 : 0);
    318 	return (which == IN_LIST ? 0 : 1);
    319 }
    320 
    321 void
    322 maketypelist(fslist)
    323 	char *fslist;
    324 {
    325 	int i;
    326 	char *nextcp, **av;
    327 
    328 	if ((fslist == NULL) || (fslist[0] == '\0'))
    329 		errx(1, "empty type list");
    330 
    331 	/*
    332 	 * XXX
    333 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
    334 	 * no yyy's, not the more intuitive "noyyy,noyyy".
    335 	 */
    336 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    337 		fslist += 2;
    338 		which = NOT_IN_LIST;
    339 	} else
    340 		which = IN_LIST;
    341 
    342 	/* Count the number of types. */
    343 	for (i = 0, nextcp = fslist; *nextcp != NULL; ++nextcp)
    344 		if (*nextcp == ',')
    345 			i++;
    346 
    347 	/* Build an array of that many types. */
    348 	if ((av = typelist = malloc((i + 2) * sizeof(char *))) == NULL)
    349 		err(1, NULL);
    350 	for (i = 0; fslist != NULL; fslist = nextcp, ++i) {
    351 		if ((nextcp = strchr(fslist, ',')) != NULL)
    352 			*nextcp++ = '\0';
    353 		/* Note that we're keeping pointers into the input string. */
    354 		av[i] = fslist;
    355 	}
    356 	/* Terminate the array. */
    357 	av[i++] = NULL;
    358 }
    359 
    360 int
    361 namematch(hp)
    362 	struct hostent *hp;
    363 {
    364 	char *cp, **np;
    365 
    366 	if ((hp == NULL) || (nfshost == NULL))
    367 		return (1);
    368 
    369 	if (strcasecmp(nfshost, hp->h_name) == 0)
    370 		return (1);
    371 
    372 	if ((cp = strchr(hp->h_name, '.')) != NULL) {
    373 		*cp = '\0';
    374 		if (strcasecmp(nfshost, hp->h_name) == 0)
    375 			return (1);
    376 	}
    377 	for (np = hp->h_aliases; *np; np++) {
    378 		if (strcasecmp(nfshost, *np) == 0)
    379 			return (1);
    380 		if ((cp = strchr(*np, '.')) != NULL) {
    381 			*cp = '\0';
    382 			if (strcasecmp(nfshost, *np) == 0)
    383 				return (1);
    384 		}
    385 	}
    386 	return (0);
    387 }
    388 
    389 /*
    390  * xdr routines for mount rpc's
    391  */
    392 int
    393 xdr_dir(xdrsp, dirp)
    394 	XDR *xdrsp;
    395 	char *dirp;
    396 {
    397 	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
    398 }
    399 
    400 void
    401 usage()
    402 {
    403 	(void)fprintf(stderr,
    404 	    "usage: %s\n       %s\n",
    405 	    "umount [-fv] [-t fstypelist] special | node",
    406 	    "umount -a[fv] [-h host] [-t fstypelist]");
    407 	exit(1);
    408 }
    409