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umount.c revision 1.30 
      1 /*	$NetBSD: umount.c,v 1.30 2004/03/12 21:14:29 dsl 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)umount.c	8.8 (Berkeley) 5/8/95";
     41 #else
     42 __RCSID("$NetBSD: umount.c,v 1.30 2004/03/12 21:14:29 dsl Exp $");
     43 #endif
     44 #endif /* not lint */
     45 
     46 #include <sys/param.h>
     47 #include <sys/stat.h>
     48 #include <sys/mount.h>
     49 #include <sys/time.h>
     50 #include <sys/socket.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 { MNTANY, MNTON, MNTFROM } mntwhat;
     66 
     67 int	fake, fflag, verbose, raw;
     68 char	*nfshost;
     69 struct addrinfo *nfshost_ai = NULL;
     70 
     71 int	 checkvfsname __P((const char *, char **));
     72 char	*getmntname __P((char *, mntwhat, char **));
     73 char	**makevfslist __P((char *));
     74 int	 main __P((int, char *[]));
     75 int	 namematch __P((struct addrinfo *));
     76 int	 sacmp __P((struct sockaddr *, struct sockaddr *));
     77 int	 selected __P((int));
     78 int	 umountfs __P((char *, char **));
     79 void	 usage __P((void));
     80 int	 xdr_dir __P((XDR *, char *));
     81 
     82 int
     83 main(argc, argv)
     84 	int argc;
     85 	char *argv[];
     86 {
     87 	int all, ch, errs, mnts;
     88 	char **typelist = NULL;
     89 	struct statfs *mntbuf;
     90 	struct addrinfo hints;
     91 
     92 	/* Start disks transferring immediately. */
     93 	sync();
     94 
     95 	all = 0;
     96 	while ((ch = getopt(argc, argv, "AaFfRh:t:v")) != -1)
     97 		switch (ch) {
     98 		case 'A':
     99 		case 'a':
    100 			all = 1;
    101 			break;
    102 		case 'F':
    103 			fake = 1;
    104 			break;
    105 		case 'f':
    106 			fflag = MNT_FORCE;
    107 			break;
    108 		case 'h':	/* -h implies -A. */
    109 			all = 1;
    110 			nfshost = optarg;
    111 			break;
    112 		case 'R':
    113 			raw = 1;
    114 			break;
    115 		case 't':
    116 			if (typelist != NULL)
    117 				errx(1, "only one -t option may be specified.");
    118 			typelist = makevfslist(optarg);
    119 			break;
    120 		case 'v':
    121 			verbose = 1;
    122 			break;
    123 		default:
    124 			usage();
    125 			/* NOTREACHED */
    126 		}
    127 	argc -= optind;
    128 	argv += optind;
    129 
    130 	if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw))
    131 		usage();
    132 
    133 	/* -h implies "-t nfs" if no -t flag. */
    134 	if ((nfshost != NULL) && (typelist == NULL))
    135 		typelist = makevfslist("nfs");
    136 
    137 	if (nfshost != NULL) {
    138 		memset(&hints, 0, sizeof hints);
    139 		getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
    140 	}
    141 
    142 	errs = 0;
    143 	if (all) {
    144 		if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    145 			warn("getmntinfo");
    146 			errs = 1;
    147 		}
    148 		for (errs = 0, mnts--; mnts > 0; mnts--) {
    149 			if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
    150 				continue;
    151 			if (umountfs(mntbuf[mnts].f_mntonname, typelist) != 0)
    152 				errs = 1;
    153 		}
    154 	} else {
    155 		for (errs = 0; *argv != NULL; ++argv)
    156 			if (umountfs(*argv, typelist) != 0)
    157 				errs = 1;
    158 	}
    159 	exit(errs);
    160 }
    161 
    162 int
    163 umountfs(name, typelist)
    164 	char *name;
    165 	char **typelist;
    166 {
    167 	enum clnt_stat clnt_stat;
    168 	struct stat sb;
    169 	struct timeval try;
    170 	CLIENT *clp;
    171 	char *type, *delimp, *hostp, *mntpt, rname[MAXPATHLEN];
    172 	mntwhat what;
    173 	struct addrinfo *ai, hints;
    174 
    175 	delimp = NULL;
    176 
    177 	if (raw) {
    178 		mntpt = name;
    179 	} else {
    180 
    181 		what = MNTANY;
    182 		if (realpath(name, rname) != NULL) {
    183 			name = rname;
    184 
    185 			if (stat(name, &sb) == 0) {
    186 				if (S_ISBLK(sb.st_mode))
    187 					what = MNTON;
    188 				else if (S_ISDIR(sb.st_mode))
    189 					what = MNTFROM;
    190 			}
    191 		}
    192 		mntpt = name;
    193 
    194 		switch (what) {
    195 		case MNTON:
    196 			if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    197 				warnx("%s: not currently mounted", name);
    198 				return (1);
    199 			}
    200 			break;
    201 		case MNTFROM:
    202 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    203 				warnx("%s: not currently mounted", mntpt);
    204 				return (1);
    205 			}
    206 			break;
    207 		default:
    208 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    209 				name = mntpt;
    210 				if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    211 					warnx("%s: not currently mounted", name);
    212 					return (1);
    213 				}
    214 			}
    215 		}
    216 
    217 		if (checkvfsname(type, typelist))
    218 			return (1);
    219 
    220 		memset(&hints, 0, sizeof hints);
    221 		ai = NULL;
    222 		if (!strncmp(type, MOUNT_NFS, MFSNAMELEN)) {
    223 			/* look for host:mountpoint */
    224 			if ((delimp = strrchr(name, ':')) != NULL) {
    225 				*delimp = '\0';
    226 				hostp = name;
    227 				getaddrinfo(hostp, NULL, &hints, &ai);
    228 				name = delimp + 1;
    229 				*delimp = ':';
    230 			}
    231 		}
    232 
    233 		if (!namematch(ai))
    234 			return (1);
    235 	}
    236 
    237 	if (verbose)
    238 		(void)printf("%s: unmount from %s\n", name, mntpt);
    239 	if (fake)
    240 		return (0);
    241 
    242 	if (unmount(mntpt, fflag) < 0) {
    243 		warn("%s", mntpt);
    244 		return (1);
    245 	}
    246 
    247 	if (!raw && !strncmp(type, MOUNT_NFS, MFSNAMELEN) &&
    248 	    (ai != NULL) && !(fflag & MNT_FORCE)) {
    249 		*delimp = '\0';
    250 		clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
    251 		if (clp  == NULL) {
    252 			clnt_pcreateerror("Cannot MNT PRC");
    253 			return (1);
    254 		}
    255 		clp->cl_auth = authsys_create_default();
    256 		try.tv_sec = 20;
    257 		try.tv_usec = 0;
    258 		clnt_stat = clnt_call(clp,
    259 		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
    260 		if (clnt_stat != RPC_SUCCESS) {
    261 			clnt_perror(clp, "Bad MNT RPC");
    262 			return (1);
    263 		}
    264 		auth_destroy(clp->cl_auth);
    265 		clnt_destroy(clp);
    266 	}
    267 	return (0);
    268 }
    269 
    270 char *
    271 getmntname(name, what, type)
    272 	char *name;
    273 	mntwhat what;
    274 	char **type;
    275 {
    276 	static struct statfs *mntbuf;
    277 	static int mntsize;
    278 	int i;
    279 
    280 	if (mntbuf == NULL &&
    281 	    (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    282 		warn("getmntinfo");
    283 		return (NULL);
    284 	}
    285 	for (i = mntsize - 1; i >= 0; i--) {
    286 		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
    287 			if (type)
    288 				*type = mntbuf[i].f_fstypename;
    289 			return (mntbuf[i].f_mntonname);
    290 		}
    291 		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
    292 			if (type)
    293 				*type = mntbuf[i].f_fstypename;
    294 			return (mntbuf[i].f_mntfromname);
    295 		}
    296 	}
    297 	return (NULL);
    298 }
    299 
    300 int
    301 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
    302 {
    303 	void *p1, *p2;
    304 	int len;
    305 
    306 	if (sa1->sa_family != sa2->sa_family)
    307 		return 1;
    308 
    309 	switch (sa1->sa_family) {
    310 	case AF_INET:
    311 		p1 = &((struct sockaddr_in *)sa1)->sin_addr;
    312 		p2 = &((struct sockaddr_in *)sa2)->sin_addr;
    313 		len = 4;
    314 		break;
    315 	case AF_INET6:
    316 		p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
    317 		p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
    318 		len = 16;
    319 		if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
    320 		    ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
    321 			return 1;
    322 		break;
    323 	default:
    324 		return 1;
    325 	}
    326 
    327 	return memcmp(p1, p2, len);
    328 }
    329 
    330 int
    331 namematch(ai)
    332 	struct addrinfo *ai;
    333 {
    334 	struct addrinfo *aip;
    335 
    336 	if (nfshost == NULL || nfshost_ai == NULL)
    337 		return (1);
    338 
    339 	while (ai != NULL) {
    340 		aip = nfshost_ai;
    341 		while (aip != NULL) {
    342 			if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
    343 				return 1;
    344 			aip = aip->ai_next;
    345 		}
    346 		ai = ai->ai_next;
    347 	}
    348 
    349 	return 0;
    350 }
    351 
    352 /*
    353  * xdr routines for mount rpc's
    354  */
    355 int
    356 xdr_dir(xdrsp, dirp)
    357 	XDR *xdrsp;
    358 	char *dirp;
    359 {
    360 	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
    361 }
    362 
    363 void
    364 usage()
    365 {
    366 	(void)fprintf(stderr,
    367 	    "usage: %s\n       %s\n",
    368 	    "umount [-fvFR] [-t fstypelist] special | node",
    369 	    "umount -a[fvF] [-h host] [-t fstypelist]");
    370 	exit(1);
    371 }
    372