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umount.c revision 1.27 
      1 /*	$NetBSD: umount.c,v 1.27 2000/06/06 07:09:15 chs 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 1.27 2000/06/06 07:09:15 chs 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	 umountfs __P((char *, char **));
     81 void	 usage __P((void));
     82 int	 xdr_dir __P((XDR *, char *));
     83 
     84 int
     85 main(argc, argv)
     86 	int argc;
     87 	char *argv[];
     88 {
     89 	int all, ch, errs, mnts;
     90 	char **typelist = NULL;
     91 	struct statfs *mntbuf;
     92 
     93 	/* Start disks transferring immediately. */
     94 	sync();
     95 
     96 	all = 0;
     97 	while ((ch = getopt(argc, argv, "AaFfRh:t:v")) != -1)
     98 		switch (ch) {
     99 		case 'A':
    100 		case 'a':
    101 			all = 1;
    102 			break;
    103 		case 'F':
    104 			fake = 1;
    105 			break;
    106 		case 'f':
    107 			fflag = MNT_FORCE;
    108 			break;
    109 		case 'h':	/* -h implies -A. */
    110 			all = 1;
    111 			nfshost = optarg;
    112 			break;
    113 		case 'R':
    114 			raw = 1;
    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) || (all && raw))
    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 	if (all) {
    140 		if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    141 			warn("getmntinfo");
    142 			errs = 1;
    143 		}
    144 		for (errs = 0, mnts--; mnts > 0; mnts--) {
    145 			if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
    146 				continue;
    147 			if (umountfs(mntbuf[mnts].f_mntonname, typelist) != 0)
    148 				errs = 1;
    149 		}
    150 	} else {
    151 		for (errs = 0; *argv != NULL; ++argv)
    152 			if (umountfs(*argv, typelist) != 0)
    153 				errs = 1;
    154 	}
    155 	exit(errs);
    156 }
    157 
    158 int
    159 umountfs(name, typelist)
    160 	char *name;
    161 	char **typelist;
    162 {
    163 	enum clnt_stat clnt_stat;
    164 	struct hostent *hp;
    165 	struct sockaddr_in saddr;
    166 	struct stat sb;
    167 	struct timeval pertry, try;
    168 	CLIENT *clp;
    169 	int so;
    170 	char *type, *delimp, *hostp, *mntpt, rname[MAXPATHLEN];
    171 	mntwhat what;
    172 
    173 	hp = NULL;
    174 	delimp = NULL;
    175 
    176 	if (raw) {
    177 		mntpt = name;
    178 	} else {
    179 
    180 		if (realpath(name, rname) == NULL) {
    181 			warn("%s", rname);
    182 			return (1);
    183 		}
    184 
    185 		what = MNTANY;
    186 		mntpt = name = rname;
    187 
    188 		if (stat(name, &sb) == 0) {
    189 			if (S_ISBLK(sb.st_mode))
    190 				what = MNTON;
    191 			else if (S_ISDIR(sb.st_mode))
    192 				what = MNTFROM;
    193 		}
    194 
    195 		switch (what) {
    196 		case MNTON:
    197 			if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    198 				warnx("%s: not currently mounted", name);
    199 				return (1);
    200 			}
    201 			break;
    202 		case MNTFROM:
    203 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    204 				warnx("%s: not currently mounted", mntpt);
    205 				return (1);
    206 			}
    207 			break;
    208 		default:
    209 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    210 				name = rname;
    211 				if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    212 					warnx("%s: not currently mounted", name);
    213 					return (1);
    214 				}
    215 			}
    216 		}
    217 
    218 		if (checkvfsname(type, typelist))
    219 			return (1);
    220 
    221 		hp = NULL;
    222 		if (!strncmp(type, MOUNT_NFS, MFSNAMELEN)) {
    223 			if ((delimp = strchr(name, '@')) != NULL) {
    224 				hostp = delimp + 1;
    225 				*delimp = '\0';
    226 				hp = gethostbyname(hostp);
    227 				*delimp = '@';
    228 			} else if ((delimp = strchr(name, ':')) != NULL) {
    229 				*delimp = '\0';
    230 				hostp = name;
    231 				hp = gethostbyname(hostp);
    232 				name = delimp + 1;
    233 				*delimp = ':';
    234 			}
    235 		}
    236 
    237 		if (!namematch(hp))
    238 			return (1);
    239 	}
    240 
    241 	if (verbose)
    242 		(void)printf("%s: unmount from %s\n", name, mntpt);
    243 	if (fake)
    244 		return (0);
    245 
    246 	if (unmount(mntpt, fflag) < 0) {
    247 		warn("%s", mntpt);
    248 		return (1);
    249 	}
    250 
    251 	if (!raw && !strncmp(type, MOUNT_NFS, MFSNAMELEN) &&
    252 	    (hp != NULL) && !(fflag & MNT_FORCE)) {
    253 		*delimp = '\0';
    254 		memset(&saddr, 0, sizeof(saddr));
    255 		saddr.sin_family = AF_INET;
    256 		saddr.sin_port = 0;
    257 		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
    258 		pertry.tv_sec = 3;
    259 		pertry.tv_usec = 0;
    260 		so = RPC_ANYSOCK;
    261 		if ((clp = clntudp_create(&saddr,
    262 		    RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
    263 			clnt_pcreateerror("Cannot MNT PRC");
    264 			return (1);
    265 		}
    266 		clp->cl_auth = authunix_create_default();
    267 		try.tv_sec = 20;
    268 		try.tv_usec = 0;
    269 		clnt_stat = clnt_call(clp,
    270 		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
    271 		if (clnt_stat != RPC_SUCCESS) {
    272 			clnt_perror(clp, "Bad MNT RPC");
    273 			return (1);
    274 		}
    275 		auth_destroy(clp->cl_auth);
    276 		clnt_destroy(clp);
    277 	}
    278 	return (0);
    279 }
    280 
    281 char *
    282 getmntname(name, what, type)
    283 	char *name;
    284 	mntwhat what;
    285 	char **type;
    286 {
    287 	static struct statfs *mntbuf;
    288 	static int mntsize;
    289 	int i;
    290 
    291 	if (mntbuf == NULL &&
    292 	    (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    293 		warn("getmntinfo");
    294 		return (NULL);
    295 	}
    296 	for (i = mntsize - 1; i >= 0; i--) {
    297 		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
    298 			if (type)
    299 				*type = mntbuf[i].f_fstypename;
    300 			return (mntbuf[i].f_mntonname);
    301 		}
    302 		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
    303 			if (type)
    304 				*type = mntbuf[i].f_fstypename;
    305 			return (mntbuf[i].f_mntfromname);
    306 		}
    307 	}
    308 	return (NULL);
    309 }
    310 
    311 int
    312 namematch(hp)
    313 	struct hostent *hp;
    314 {
    315 	char *cp, **np;
    316 
    317 	if ((hp == NULL) || (nfshost == NULL))
    318 		return (1);
    319 
    320 	if (strcasecmp(nfshost, hp->h_name) == 0)
    321 		return (1);
    322 
    323 	if ((cp = strchr(hp->h_name, '.')) != NULL) {
    324 		*cp = '\0';
    325 		if (strcasecmp(nfshost, hp->h_name) == 0)
    326 			return (1);
    327 	}
    328 	for (np = hp->h_aliases; *np; np++) {
    329 		if (strcasecmp(nfshost, *np) == 0)
    330 			return (1);
    331 		if ((cp = strchr(*np, '.')) != NULL) {
    332 			*cp = '\0';
    333 			if (strcasecmp(nfshost, *np) == 0)
    334 				return (1);
    335 		}
    336 	}
    337 	return (0);
    338 }
    339 
    340 /*
    341  * xdr routines for mount rpc's
    342  */
    343 int
    344 xdr_dir(xdrsp, dirp)
    345 	XDR *xdrsp;
    346 	char *dirp;
    347 {
    348 	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
    349 }
    350 
    351 void
    352 usage()
    353 {
    354 	(void)fprintf(stderr,
    355 	    "usage: %s\n       %s\n",
    356 	    "umount [-fvFR] [-t fstypelist] special | node",
    357 	    "umount -a[fvF] [-h host] [-t fstypelist]");
    358 	exit(1);
    359 }
    360