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umount.c revision 1.23 
      1 /*	$NetBSD: umount.c,v 1.23 1998/04/01 15:20:25 kleink 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 1.23 1998/04/01 15:20:25 kleink 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;
     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, "AaFfh: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 't':
    117 			if (typelist != NULL)
    118 				errx(1, "only one -t option may be specified.");
    119 			typelist = makevfslist(optarg);
    120 			break;
    121 		case 'v':
    122 			verbose = 1;
    123 			break;
    124 		default:
    125 			usage();
    126 			/* NOTREACHED */
    127 		}
    128 	argc -= optind;
    129 	argv += optind;
    130 
    131 	if ((argc == 0 && !all) || (argc != 0 && all))
    132 		usage();
    133 
    134 	/* -h implies "-t nfs" if no -t flag. */
    135 	if ((nfshost != NULL) && (typelist == NULL))
    136 		typelist = makevfslist("nfs");
    137 
    138 	errs = 0;
    139 	switch (all) {
    140 	case 2:
    141 		if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    142 			warn("getmntinfo");
    143 			errs = 1;
    144 			break;
    145 		}
    146 		for (errs = 0, mnts--; mnts > 0; mnts--) {
    147 			if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
    148 				continue;
    149 			if (umountfs(mntbuf[mnts].f_mntonname, typelist) != 0)
    150 				errs = 1;
    151 		}
    152 		break;
    153 	case 1:
    154 		if (setfsent() == 0)
    155 			err(1, "%s", _PATH_FSTAB);
    156 		errs = umountall(typelist);
    157 		break;
    158 	case 0:
    159 		for (errs = 0; *argv != NULL; ++argv)
    160 			if (umountfs(*argv, typelist) != 0)
    161 				errs = 1;
    162 		break;
    163 	}
    164 	exit(errs);
    165 }
    166 
    167 
    168 int
    169 umountall(typelist)
    170 	char **typelist;
    171 {
    172 	struct statfs *fs;
    173 	int n;
    174 	int rval;
    175 
    176 	n = getmntinfo(&fs, MNT_NOWAIT);
    177 	if (n == 0)
    178 		err(1, "%s", "");
    179 
    180 	rval = 0;
    181 	while (--n >= 0) {
    182 		/* Ignore the root. */
    183 		if (strncmp(fs[n].f_mntonname, "/", MNAMELEN) == 0)
    184 			continue;
    185 
    186 		if (checkvfsname(fs[n].f_fstypename, typelist))
    187 			continue;
    188 
    189 		if (umountfs(fs[n].f_mntonname, typelist))
    190 			rval = 1;
    191 	}
    192 	return (rval);
    193 }
    194 
    195 int
    196 umountfs(name, typelist)
    197 	char *name;
    198 	char **typelist;
    199 {
    200 	enum clnt_stat clnt_stat;
    201 	struct hostent *hp;
    202 	struct sockaddr_in saddr;
    203 	struct stat sb;
    204 	struct timeval pertry, try;
    205 	CLIENT *clp;
    206 	int so;
    207 	char *type, *delimp, *hostp, *mntpt, rname[MAXPATHLEN];
    208 	mntwhat what;
    209 
    210 	hp = NULL;
    211 	delimp = NULL;
    212 	if (realpath(name, rname) == NULL) {
    213 		warn("%s", rname);
    214 		return (1);
    215 	}
    216 
    217 	what = MNTANY;
    218 	mntpt = name = rname;
    219 
    220 	if (stat(name, &sb) == 0) {
    221 		if (S_ISBLK(sb.st_mode))
    222 			what = MNTON;
    223 		else if (S_ISDIR(sb.st_mode))
    224 			what = MNTFROM;
    225 	}
    226 
    227 	switch (what) {
    228 	case MNTON:
    229 		if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    230 			warnx("%s: not currently mounted", name);
    231 			return (1);
    232 		}
    233 		break;
    234 	case MNTFROM:
    235 		if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    236 			warnx("%s: not currently mounted", mntpt);
    237 			return (1);
    238 		}
    239 		break;
    240 	default:
    241 		if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    242 			name = rname;
    243 			if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    244 				warnx("%s: not currently mounted", name);
    245 				return (1);
    246 			}
    247 		}
    248 	}
    249 
    250 	if (checkvfsname(type, typelist))
    251 		return (1);
    252 
    253 	hp = NULL;
    254 	if (!strncmp(type, MOUNT_NFS, MFSNAMELEN)) {
    255 		if ((delimp = strchr(name, '@')) != NULL) {
    256 			hostp = delimp + 1;
    257 			*delimp = '\0';
    258 			hp = gethostbyname(hostp);
    259 			*delimp = '@';
    260 		} else if ((delimp = strchr(name, ':')) != NULL) {
    261 			*delimp = '\0';
    262 			hostp = name;
    263 			hp = gethostbyname(hostp);
    264 			name = delimp + 1;
    265 			*delimp = ':';
    266 		}
    267 	}
    268 
    269 	if (!namematch(hp))
    270 		return (1);
    271 
    272 	if (verbose)
    273 		(void)printf("%s: unmount from %s\n", name, mntpt);
    274 	if (fake)
    275 		return (0);
    276 
    277 	if (unmount(mntpt, fflag) < 0) {
    278 		warn("%s", mntpt);
    279 		return (1);
    280 	}
    281 
    282 	if (!strncmp(type, MOUNT_NFS, MFSNAMELEN) &&
    283 	    (hp != NULL) && !(fflag & MNT_FORCE)) {
    284 		*delimp = '\0';
    285 		memset(&saddr, 0, sizeof(saddr));
    286 		saddr.sin_family = AF_INET;
    287 		saddr.sin_port = 0;
    288 		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
    289 		pertry.tv_sec = 3;
    290 		pertry.tv_usec = 0;
    291 		so = RPC_ANYSOCK;
    292 		if ((clp = clntudp_create(&saddr,
    293 		    RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
    294 			clnt_pcreateerror("Cannot MNT PRC");
    295 			return (1);
    296 		}
    297 		clp->cl_auth = authunix_create_default();
    298 		try.tv_sec = 20;
    299 		try.tv_usec = 0;
    300 		clnt_stat = clnt_call(clp,
    301 		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
    302 		if (clnt_stat != RPC_SUCCESS) {
    303 			clnt_perror(clp, "Bad MNT RPC");
    304 			return (1);
    305 		}
    306 		auth_destroy(clp->cl_auth);
    307 		clnt_destroy(clp);
    308 	}
    309 	return (0);
    310 }
    311 
    312 char *
    313 getmntname(name, what, type)
    314 	char *name;
    315 	mntwhat what;
    316 	char **type;
    317 {
    318 	static struct statfs *mntbuf;
    319 	static int mntsize;
    320 	int i;
    321 
    322 	if (mntbuf == NULL &&
    323 	    (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    324 		warn("getmntinfo");
    325 		return (NULL);
    326 	}
    327 	for (i = mntsize - 1; i >= 0; i--) {
    328 		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
    329 			if (type)
    330 				*type = mntbuf[i].f_fstypename;
    331 			return (mntbuf[i].f_mntonname);
    332 		}
    333 		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
    334 			if (type)
    335 				*type = mntbuf[i].f_fstypename;
    336 			return (mntbuf[i].f_mntfromname);
    337 		}
    338 	}
    339 	return (NULL);
    340 }
    341 
    342 int
    343 namematch(hp)
    344 	struct hostent *hp;
    345 {
    346 	char *cp, **np;
    347 
    348 	if ((hp == NULL) || (nfshost == NULL))
    349 		return (1);
    350 
    351 	if (strcasecmp(nfshost, hp->h_name) == 0)
    352 		return (1);
    353 
    354 	if ((cp = strchr(hp->h_name, '.')) != NULL) {
    355 		*cp = '\0';
    356 		if (strcasecmp(nfshost, hp->h_name) == 0)
    357 			return (1);
    358 	}
    359 	for (np = hp->h_aliases; *np; np++) {
    360 		if (strcasecmp(nfshost, *np) == 0)
    361 			return (1);
    362 		if ((cp = strchr(*np, '.')) != NULL) {
    363 			*cp = '\0';
    364 			if (strcasecmp(nfshost, *np) == 0)
    365 				return (1);
    366 		}
    367 	}
    368 	return (0);
    369 }
    370 
    371 /*
    372  * xdr routines for mount rpc's
    373  */
    374 int
    375 xdr_dir(xdrsp, dirp)
    376 	XDR *xdrsp;
    377 	char *dirp;
    378 {
    379 	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
    380 }
    381 
    382 void
    383 usage()
    384 {
    385 	(void)fprintf(stderr,
    386 	    "usage: %s\n       %s\n",
    387 	    "umount [-fvF] [-t fstypelist] special | node",
    388 	    "umount -a[fvF] [-h host] [-t fstypelist]");
    389 	exit(1);
    390 }
    391