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umount.c revision 1.24 
      1 /*	$NetBSD: umount.c,v 1.24 1998/04/17 01:19:42 fair Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1980, 1989, 1993
      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 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993\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[] = "@(#)umount.c	8.8 (Berkeley) 5/8/95";
     45 #else
     46 __RCSID("$NetBSD: umount.c,v 1.24 1998/04/17 01:19:42 fair Exp $");
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <sys/param.h>
     51 #include <sys/stat.h>
     52 #include <sys/mount.h>
     53 #include <sys/time.h>
     54 #include <sys/socket.h>
     55 
     56 #include <netdb.h>
     57 #include <rpc/rpc.h>
     58 #include <rpc/pmap_clnt.h>
     59 #include <rpc/pmap_prot.h>
     60 #include <nfs/rpcv2.h>
     61 
     62 #include <err.h>
     63 #include <fstab.h>
     64 #include <stdio.h>
     65 #include <stdlib.h>
     66 #include <string.h>
     67 #include <unistd.h>
     68 
     69 typedef enum { MNTANY, MNTON, MNTFROM } mntwhat;
     70 
     71 int	fake, fflag, verbose, raw;
     72 char	*nfshost;
     73 
     74 int	 checkvfsname __P((const char *, char **));
     75 char	*getmntname __P((char *, mntwhat, char **));
     76 char	**makevfslist __P((char *));
     77 int	 main __P((int, char *[]));
     78 int	 namematch __P((struct hostent *));
     79 int	 selected __P((int));
     80 int	 umountall __P((char **));
     81 int	 umountfs __P((char *, char **));
     82 void	 usage __P((void));
     83 int	 xdr_dir __P((XDR *, char *));
     84 
     85 int
     86 main(argc, argv)
     87 	int argc;
     88 	char *argv[];
     89 {
     90 	int all, ch, errs, mnts;
     91 	char **typelist = NULL;
     92 	struct statfs *mntbuf;
     93 
     94 	/* Start disks transferring immediately. */
     95 	sync();
     96 
     97 	all = 0;
     98 	while ((ch = getopt(argc, argv, "AaFfRh:t:v")) != -1)
     99 		switch (ch) {
    100 		case 'A':
    101 			all = 2;
    102 			break;
    103 		case 'a':
    104 			all = 1;
    105 			break;
    106 		case 'F':
    107 			fake = 1;
    108 			break;
    109 		case 'f':
    110 			fflag = MNT_FORCE;
    111 			break;
    112 		case 'h':	/* -h implies -A. */
    113 			all = 2;
    114 			nfshost = optarg;
    115 			break;
    116 		case 'R':
    117 			raw = 1;
    118 			break;
    119 		case 't':
    120 			if (typelist != NULL)
    121 				errx(1, "only one -t option may be specified.");
    122 			typelist = makevfslist(optarg);
    123 			break;
    124 		case 'v':
    125 			verbose = 1;
    126 			break;
    127 		default:
    128 			usage();
    129 			/* NOTREACHED */
    130 		}
    131 	argc -= optind;
    132 	argv += optind;
    133 
    134 	if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw))
    135 		usage();
    136 
    137 	/* -h implies "-t nfs" if no -t flag. */
    138 	if ((nfshost != NULL) && (typelist == NULL))
    139 		typelist = makevfslist("nfs");
    140 
    141 	errs = 0;
    142 	switch (all) {
    143 	case 2:
    144 		if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    145 			warn("getmntinfo");
    146 			errs = 1;
    147 			break;
    148 		}
    149 		for (errs = 0, mnts--; mnts > 0; mnts--) {
    150 			if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
    151 				continue;
    152 			if (umountfs(mntbuf[mnts].f_mntonname, typelist) != 0)
    153 				errs = 1;
    154 		}
    155 		break;
    156 	case 1:
    157 		if (setfsent() == 0)
    158 			err(1, "%s", _PATH_FSTAB);
    159 		errs = umountall(typelist);
    160 		break;
    161 	case 0:
    162 		for (errs = 0; *argv != NULL; ++argv)
    163 			if (umountfs(*argv, typelist) != 0)
    164 				errs = 1;
    165 		break;
    166 	}
    167 	exit(errs);
    168 }
    169 
    170 
    171 int
    172 umountall(typelist)
    173 	char **typelist;
    174 {
    175 	struct statfs *fs;
    176 	int n;
    177 	int rval;
    178 
    179 	n = getmntinfo(&fs, MNT_NOWAIT);
    180 	if (n == 0)
    181 		err(1, "%s", "");
    182 
    183 	rval = 0;
    184 	while (--n >= 0) {
    185 		/* Ignore the root. */
    186 		if (strncmp(fs[n].f_mntonname, "/", MNAMELEN) == 0)
    187 			continue;
    188 
    189 		if (checkvfsname(fs[n].f_fstypename, typelist))
    190 			continue;
    191 
    192 		if (umountfs(fs[n].f_mntonname, typelist))
    193 			rval = 1;
    194 	}
    195 	return (rval);
    196 }
    197 
    198 int
    199 umountfs(name, typelist)
    200 	char *name;
    201 	char **typelist;
    202 {
    203 	enum clnt_stat clnt_stat;
    204 	struct hostent *hp;
    205 	struct sockaddr_in saddr;
    206 	struct stat sb;
    207 	struct timeval pertry, try;
    208 	CLIENT *clp;
    209 	int so;
    210 	char *type, *delimp, *hostp, *mntpt, rname[MAXPATHLEN];
    211 	mntwhat what;
    212 
    213 	hp = NULL;
    214 	delimp = NULL;
    215 
    216 	if (raw) {
    217 		mntpt = name;
    218 	} else {
    219 
    220 		if (realpath(name, rname) == NULL) {
    221 			warn("%s", rname);
    222 			return (1);
    223 		}
    224 
    225 		what = MNTANY;
    226 		mntpt = name = rname;
    227 
    228 		if (stat(name, &sb) == 0) {
    229 			if (S_ISBLK(sb.st_mode))
    230 				what = MNTON;
    231 			else if (S_ISDIR(sb.st_mode))
    232 				what = MNTFROM;
    233 		}
    234 
    235 		switch (what) {
    236 		case MNTON:
    237 			if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    238 				warnx("%s: not currently mounted", name);
    239 				return (1);
    240 			}
    241 			break;
    242 		case MNTFROM:
    243 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    244 				warnx("%s: not currently mounted", mntpt);
    245 				return (1);
    246 			}
    247 			break;
    248 		default:
    249 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    250 				name = rname;
    251 				if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    252 					warnx("%s: not currently mounted", name);
    253 					return (1);
    254 				}
    255 			}
    256 		}
    257 
    258 		if (checkvfsname(type, typelist))
    259 			return (1);
    260 
    261 		hp = NULL;
    262 		if (!strncmp(type, MOUNT_NFS, MFSNAMELEN)) {
    263 			if ((delimp = strchr(name, '@')) != NULL) {
    264 				hostp = delimp + 1;
    265 				*delimp = '\0';
    266 				hp = gethostbyname(hostp);
    267 				*delimp = '@';
    268 			} else if ((delimp = strchr(name, ':')) != NULL) {
    269 				*delimp = '\0';
    270 				hostp = name;
    271 				hp = gethostbyname(hostp);
    272 				name = delimp + 1;
    273 				*delimp = ':';
    274 			}
    275 		}
    276 
    277 		if (!namematch(hp))
    278 			return (1);
    279 	}
    280 
    281 	if (verbose)
    282 		(void)printf("%s: unmount from %s\n", name, mntpt);
    283 	if (fake)
    284 		return (0);
    285 
    286 	if (unmount(mntpt, fflag) < 0) {
    287 		warn("%s", mntpt);
    288 		return (1);
    289 	}
    290 
    291 	if (!strncmp(type, MOUNT_NFS, MFSNAMELEN) &&
    292 	    (hp != NULL) && !(fflag & MNT_FORCE)) {
    293 		*delimp = '\0';
    294 		memset(&saddr, 0, sizeof(saddr));
    295 		saddr.sin_family = AF_INET;
    296 		saddr.sin_port = 0;
    297 		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
    298 		pertry.tv_sec = 3;
    299 		pertry.tv_usec = 0;
    300 		so = RPC_ANYSOCK;
    301 		if ((clp = clntudp_create(&saddr,
    302 		    RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
    303 			clnt_pcreateerror("Cannot MNT PRC");
    304 			return (1);
    305 		}
    306 		clp->cl_auth = authunix_create_default();
    307 		try.tv_sec = 20;
    308 		try.tv_usec = 0;
    309 		clnt_stat = clnt_call(clp,
    310 		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
    311 		if (clnt_stat != RPC_SUCCESS) {
    312 			clnt_perror(clp, "Bad MNT RPC");
    313 			return (1);
    314 		}
    315 		auth_destroy(clp->cl_auth);
    316 		clnt_destroy(clp);
    317 	}
    318 	return (0);
    319 }
    320 
    321 char *
    322 getmntname(name, what, type)
    323 	char *name;
    324 	mntwhat what;
    325 	char **type;
    326 {
    327 	static struct statfs *mntbuf;
    328 	static int mntsize;
    329 	int i;
    330 
    331 	if (mntbuf == NULL &&
    332 	    (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    333 		warn("getmntinfo");
    334 		return (NULL);
    335 	}
    336 	for (i = mntsize - 1; i >= 0; i--) {
    337 		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
    338 			if (type)
    339 				*type = mntbuf[i].f_fstypename;
    340 			return (mntbuf[i].f_mntonname);
    341 		}
    342 		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
    343 			if (type)
    344 				*type = mntbuf[i].f_fstypename;
    345 			return (mntbuf[i].f_mntfromname);
    346 		}
    347 	}
    348 	return (NULL);
    349 }
    350 
    351 int
    352 namematch(hp)
    353 	struct hostent *hp;
    354 {
    355 	char *cp, **np;
    356 
    357 	if ((hp == NULL) || (nfshost == NULL))
    358 		return (1);
    359 
    360 	if (strcasecmp(nfshost, hp->h_name) == 0)
    361 		return (1);
    362 
    363 	if ((cp = strchr(hp->h_name, '.')) != NULL) {
    364 		*cp = '\0';
    365 		if (strcasecmp(nfshost, hp->h_name) == 0)
    366 			return (1);
    367 	}
    368 	for (np = hp->h_aliases; *np; np++) {
    369 		if (strcasecmp(nfshost, *np) == 0)
    370 			return (1);
    371 		if ((cp = strchr(*np, '.')) != NULL) {
    372 			*cp = '\0';
    373 			if (strcasecmp(nfshost, *np) == 0)
    374 				return (1);
    375 		}
    376 	}
    377 	return (0);
    378 }
    379 
    380 /*
    381  * xdr routines for mount rpc's
    382  */
    383 int
    384 xdr_dir(xdrsp, dirp)
    385 	XDR *xdrsp;
    386 	char *dirp;
    387 {
    388 	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
    389 }
    390 
    391 void
    392 usage()
    393 {
    394 	(void)fprintf(stderr,
    395 	    "usage: %s\n       %s\n",
    396 	    "umount [-fvFR] [-t fstypelist] special | node",
    397 	    "umount -a[fvF] [-h host] [-t fstypelist]");
    398 	exit(1);
    399 }
    400